diff options
| -rw-r--r-- | fs/reiserfs/bitmap.c | 237 | ||||
| -rw-r--r-- | fs/reiserfs/dir.c | 77 | ||||
| -rw-r--r-- | fs/reiserfs/do_balan.c | 276 | ||||
| -rw-r--r-- | fs/reiserfs/file.c | 62 | ||||
| -rw-r--r-- | fs/reiserfs/fix_node.c | 967 | ||||
| -rw-r--r-- | fs/reiserfs/hashes.c | 15 | ||||
| -rw-r--r-- | fs/reiserfs/ibalance.c | 247 | ||||
| -rw-r--r-- | fs/reiserfs/inode.c | 1063 | ||||
| -rw-r--r-- | fs/reiserfs/ioctl.c | 23 | ||||
| -rw-r--r-- | fs/reiserfs/item_ops.c | 100 | ||||
| -rw-r--r-- | fs/reiserfs/journal.c | 1127 | ||||
| -rw-r--r-- | fs/reiserfs/lbalance.c | 349 | ||||
| -rw-r--r-- | fs/reiserfs/namei.c | 420 | ||||
| -rw-r--r-- | fs/reiserfs/objectid.c | 95 | ||||
| -rw-r--r-- | fs/reiserfs/prints.c | 152 | ||||
| -rw-r--r-- | fs/reiserfs/reiserfs.h | 1740 | ||||
| -rw-r--r-- | fs/reiserfs/resize.c | 63 | ||||
| -rw-r--r-- | fs/reiserfs/stree.c | 812 | ||||
| -rw-r--r-- | fs/reiserfs/super.c | 366 | ||||
| -rw-r--r-- | fs/reiserfs/tail_conversion.c | 151 | ||||
| -rw-r--r-- | fs/reiserfs/xattr.c | 60 | ||||
| -rw-r--r-- | fs/reiserfs/xattr.h | 3 | ||||
| -rw-r--r-- | fs/reiserfs/xattr_acl.c | 30 |
23 files changed, 5124 insertions, 3311 deletions
diff --git a/fs/reiserfs/bitmap.c b/fs/reiserfs/bitmap.c index c3de6501a5cb..70daba6fa6a5 100644 --- a/fs/reiserfs/bitmap.c +++ b/fs/reiserfs/bitmap.c @@ -50,8 +50,10 @@ static inline void get_bit_address(struct super_block *s, unsigned int *bmap_nr, unsigned int *offset) { - /* It is in the bitmap block number equal to the block - * number divided by the number of bits in a block. */ + /* + * It is in the bitmap block number equal to the block + * number divided by the number of bits in a block. + */ *bmap_nr = block >> (s->s_blocksize_bits + 3); /* Within that bitmap block it is located at bit offset *offset. */ *offset = block & ((s->s_blocksize << 3) - 1); @@ -71,8 +73,10 @@ int is_reusable(struct super_block *s, b_blocknr_t block, int bit_value) get_bit_address(s, block, &bmap, &offset); - /* Old format filesystem? Unlikely, but the bitmaps are all up front so - * we need to account for it. */ + /* + * Old format filesystem? Unlikely, but the bitmaps are all + * up front so we need to account for it. + */ if (unlikely(test_bit(REISERFS_OLD_FORMAT, &(REISERFS_SB(s)->s_properties)))) { b_blocknr_t bmap1 = REISERFS_SB(s)->s_sbh->b_blocknr + 1; @@ -108,8 +112,11 @@ int is_reusable(struct super_block *s, b_blocknr_t block, int bit_value) return 1; } -/* searches in journal structures for a given block number (bmap, off). If block - is found in reiserfs journal it suggests next free block candidate to test. */ +/* + * Searches in journal structures for a given block number (bmap, off). + * If block is found in reiserfs journal it suggests next free block + * candidate to test. + */ static inline int is_block_in_journal(struct super_block *s, unsigned int bmap, int off, int *next) { @@ -120,7 +127,7 @@ static inline int is_block_in_journal(struct super_block *s, unsigned int bmap, *next = tmp; PROC_INFO_INC(s, scan_bitmap.in_journal_hint); } else { - (*next) = off + 1; /* inc offset to avoid looping. */ + (*next) = off + 1; /* inc offset to avoid looping. */ PROC_INFO_INC(s, scan_bitmap.in_journal_nohint); } PROC_INFO_INC(s, scan_bitmap.retry); @@ -129,8 +136,10 @@ static inline int is_block_in_journal(struct super_block *s, unsigned int bmap, return 0; } -/* it searches for a window of zero bits with given minimum and maximum lengths in one bitmap - * block; */ +/* + * Searches for a window of zero bits with given minimum and maximum + * lengths in one bitmap block + */ static int scan_bitmap_block(struct reiserfs_transaction_handle *th, unsigned int bmap_n, int *beg, int boundary, int min, int max, int unfm) @@ -146,10 +155,6 @@ static int scan_bitmap_block(struct reiserfs_transaction_handle *th, RFALSE(bmap_n >= reiserfs_bmap_count(s), "Bitmap %u is out of " "range (0..%u)", bmap_n, reiserfs_bmap_count(s) - 1); PROC_INFO_INC(s, scan_bitmap.bmap); -/* this is unclear and lacks comments, explain how journal bitmaps - work here for the reader. Convey a sense of the design here. What - is a window? */ -/* - I mean `a window of zero bits' as in description of this function - Zam. */ if (!bi) { reiserfs_error(s, "jdm-4055", "NULL bitmap info pointer " @@ -165,15 +170,18 @@ static int scan_bitmap_block(struct reiserfs_transaction_handle *th, cont: if (bi->free_count < min) { brelse(bh); - return 0; // No free blocks in this bitmap + return 0; /* No free blocks in this bitmap */ } /* search for a first zero bit -- beginning of a window */ *beg = reiserfs_find_next_zero_le_bit ((unsigned long *)(bh->b_data), boundary, *beg); - if (*beg + min > boundary) { /* search for a zero bit fails or the rest of bitmap block - * cannot contain a zero window of minimum size */ + /* + * search for a zero bit fails or the rest of bitmap block + * cannot contain a zero window of minimum size + */ + if (*beg + min > boundary) { brelse(bh); return 0; } @@ -187,37 +195,63 @@ static int scan_bitmap_block(struct reiserfs_transaction_handle *th, next = end; break; } - /* finding the other end of zero bit window requires looking into journal structures (in - * case of searching for free blocks for unformatted nodes) */ + + /* + * finding the other end of zero bit window requires + * looking into journal structures (in case of + * searching for free blocks for unformatted nodes) + */ if (unfm && is_block_in_journal(s, bmap_n, end, &next)) break; } - /* now (*beg) points to beginning of zero bits window, - * (end) points to one bit after the window end */ - if (end - *beg >= min) { /* it seems we have found window of proper size */ + /* + * now (*beg) points to beginning of zero bits window, + * (end) points to one bit after the window end + */ + + /* found window of proper size */ + if (end - *beg >= min) { int i; reiserfs_prepare_for_journal(s, bh, 1); - /* try to set all blocks used checking are they still free */ + /* + * try to set all blocks used checking are + * they still free + */ for (i = *beg; i < end; i++) { - /* It seems that we should not check in journal again. */ + /* Don't check in journal again. */ if (reiserfs_test_and_set_le_bit (i, bh->b_data)) { - /* bit was set by another process - * while we slept in prepare_for_journal() */ + /* + * bit was set by another process while + * we slept in prepare_for_journal() + */ PROC_INFO_INC(s, scan_bitmap.stolen); - if (i >= *beg + min) { /* we can continue with smaller set of allocated blocks, - * if length of this set is more or equal to `min' */ + + /* + * we can continue with smaller set + * of allocated blocks, if length of + * this set is more or equal to `min' + */ + if (i >= *beg + min) { end = i; break; } - /* otherwise we clear all bit were set ... */ + + /* + * otherwise we clear all bit + * were set ... + */ while (--i >= *beg) reiserfs_clear_le_bit (i, bh->b_data); reiserfs_restore_prepared_buffer(s, bh); *beg = org; - /* ... and search again in current block from beginning */ + + /* + * Search again in current block + * from beginning + */ goto cont; } } @@ -268,11 +302,13 @@ static inline int block_group_used(struct super_block *s, u32 id) int bm = bmap_hash_id(s, id); struct reiserfs_bitmap_info *info = &SB_AP_BITMAP(s)[bm]; - /* If we don't have cached information on this bitmap block, we're + /* + * If we don't have cached information on this bitmap block, we're * going to have to load it later anyway. Loading it here allows us * to make a better decision. This favors long-term performance gain * with a better on-disk layout vs. a short term gain of skipping the - * read and potentially having a bad placement. */ + * read and potentially having a bad placement. + */ if (info->free_count == UINT_MAX) { struct buffer_head *bh = reiserfs_read_bitmap_block(s, bm); brelse(bh); @@ -305,17 +341,16 @@ __le32 reiserfs_choose_packing(struct inode * dir) return packing; } -/* Tries to find contiguous zero bit window (given size) in given region of - * bitmap and place new blocks there. Returns number of allocated blocks. */ +/* + * Tries to find contiguous zero bit window (given size) in given region of + * bitmap and place new blocks there. Returns number of allocated blocks. + */ static int scan_bitmap(struct reiserfs_transaction_handle *th, b_blocknr_t * start, b_blocknr_t finish, int min, int max, int unfm, sector_t file_block) { int nr_allocated = 0; struct super_block *s = th->t_super; - /* find every bm and bmap and bmap_nr in this file, and change them all to bitmap_blocknr - * - Hans, it is not a block number - Zam. */ - unsigned int bm, off; unsigned int end_bm, end_off; unsigned int off_max = s->s_blocksize << 3; @@ -323,8 +358,10 @@ static int scan_bitmap(struct reiserfs_transaction_handle *th, BUG_ON(!th->t_trans_id); PROC_INFO_INC(s, scan_bitmap.call); + + /* No point in looking for more free blocks */ if (SB_FREE_BLOCKS(s) <= 0) - return 0; // No point in looking for more free blocks + return 0; get_bit_address(s, *start, &bm, &off); get_bit_address(s, finish, &end_bm, &end_off); @@ -333,7 +370,8 @@ static int scan_bitmap(struct reiserfs_transaction_handle *th, if (end_bm > reiserfs_bmap_count(s)) end_bm = reiserfs_bmap_count(s); - /* When the bitmap is more than 10% free, anyone can allocate. + /* + * When the bitmap is more than 10% free, anyone can allocate. * When it's less than 10% free, only files that already use the * bitmap are allowed. Once we pass 80% full, this restriction * is lifted. @@ -532,7 +570,8 @@ int reiserfs_parse_alloc_options(struct super_block *s, char *options) { char *this_char, *value; - REISERFS_SB(s)->s_alloc_options.bits = 0; /* clear default settings */ + /* clear default settings */ + REISERFS_SB(s)->s_alloc_options.bits = 0; while ((this_char = strsep(&options, ":")) != NULL) { if ((value = strchr(this_char, '=')) != NULL) @@ -733,7 +772,7 @@ static inline void new_hashed_relocation(reiserfs_blocknr_hint_t * hint) hash_in = (char *)&hint->key.k_dir_id; } else { if (!hint->inode) { - //hint->search_start = hint->beg; + /*hint->search_start = hint->beg;*/ hash_in = (char *)&hint->key.k_dir_id; } else if (TEST_OPTION(displace_based_on_dirid, hint->th->t_super)) @@ -786,7 +825,8 @@ static void oid_groups(reiserfs_blocknr_hint_t * hint) dirid = le32_to_cpu(INODE_PKEY(hint->inode)->k_dir_id); - /* keep the root dir and it's first set of subdirs close to + /* + * keep the root dir and it's first set of subdirs close to * the start of the disk */ if (dirid <= 2) @@ -800,7 +840,8 @@ static void oid_groups(reiserfs_blocknr_hint_t * hint) } } -/* returns 1 if it finds an indirect item and gets valid hint info +/* + * returns 1 if it finds an indirect item and gets valid hint info * from it, otherwise 0 */ static int get_left_neighbor(reiserfs_blocknr_hint_t * hint) @@ -812,8 +853,11 @@ static int get_left_neighbor(reiserfs_blocknr_hint_t * hint) __le32 *item; int ret = 0; - if (!hint->path) /* reiserfs code can call this function w/o pointer to path - * structure supplied; then we rely on supplied search_start */ + /* + * reiserfs code can call this function w/o pointer to path + * structure supplied; then we rely on supplied search_start + */ + if (!hint->path) return 0; path = hint->path; @@ -825,12 +869,13 @@ static int get_left_neighbor(reiserfs_blocknr_hint_t * hint) hint->search_start = bh->b_blocknr; + /* + * for indirect item: go to left and look for the first non-hole entry + * in the indirect item + */ if (!hint->formatted_node && is_indirect_le_ih(ih)) { - /* for indirect item: go to left and look for the first non-hole entry - in the indirect item */ if (pos_in_item == I_UNFM_NUM(ih)) pos_in_item--; -// pos_in_item = I_UNFM_NUM (ih) - 1; while (pos_in_item >= 0) { int t = get_block_num(item, pos_in_item); if (t) { @@ -846,10 +891,12 @@ static int get_left_neighbor(reiserfs_blocknr_hint_t * hint) return ret; } -/* should be, if formatted node, then try to put on first part of the device - specified as number of percent with mount option device, else try to put - on last of device. This is not to say it is good code to do so, - but the effect should be measured. */ +/* + * should be, if formatted node, then try to put on first part of the device + * specified as number of percent with mount option device, else try to put + * on last of device. This is not to say it is good code to do so, + * but the effect should be measured. + */ static inline void set_border_in_hint(struct super_block *s, reiserfs_blocknr_hint_t * hint) { @@ -975,21 +1022,27 @@ static void determine_search_start(reiserfs_blocknr_hint_t * hint, set_border_in_hint(s, hint); #ifdef DISPLACE_NEW_PACKING_LOCALITIES - /* whenever we create a new directory, we displace it. At first we will - hash for location, later we might look for a moderately empty place for - it */ + /* + * whenever we create a new directory, we displace it. At first + * we will hash for location, later we might look for a moderately + * empty place for it + */ if (displacing_new_packing_localities(s) && hint->th->displace_new_blocks) { displace_new_packing_locality(hint); - /* we do not continue determine_search_start, - * if new packing locality is being displaced */ + /* + * we do not continue determine_search_start, + * if new packing locality is being displaced + */ return; } #endif - /* all persons should feel encouraged to add more special cases here and - * test them */ + /* + * all persons should feel encouraged to add more special cases + * here and test them + */ if (displacing_large_files(s) && !hint->formatted_node && this_blocknr_allocation_would_make_it_a_large_file(hint)) { @@ -997,8 +1050,10 @@ static void determine_search_start(reiserfs_blocknr_hint_t * hint, return; } - /* if none of our special cases is relevant, use the left neighbor in the - tree order of the new node we are allocating for */ + /* + * if none of our special cases is relevant, use the left + * neighbor in the tree order of the new node we are allocating for + */ if (hint->formatted_node && TEST_OPTION(hashed_formatted_nodes, s)) { hash_formatted_node(hint); return; @@ -1006,10 +1061,13 @@ static void determine_search_start(reiserfs_blocknr_hint_t * hint, unfm_hint = get_left_neighbor(hint); - /* Mimic old block allocator behaviour, that is if VFS allowed for preallocation, - new blocks are displaced based on directory ID. Also, if suggested search_start - is less than last preallocated block, we start searching from it, assuming that - HDD dataflow is faster in forward direction */ + /* + * Mimic old block allocator behaviour, that is if VFS allowed for + * preallocation, new blocks are displaced based on directory ID. + * Also, if suggested search_start is less than last preallocated + * block, we start searching from it, assuming that HDD dataflow + * is faster in forward direction + */ if (TEST_OPTION(old_way, s)) { if (!hint->formatted_node) { if (!reiserfs_hashed_relocation(s)) @@ -1038,11 +1096,13 @@ static void determine_search_start(reiserfs_blocknr_hint_t * hint, TEST_OPTION(old_hashed_relocation, s)) { old_hashed_relocation(hint); } + /* new_hashed_relocation works with both formatted/unformatted nodes */ if ((!unfm_hint || hint->formatted_node) && TEST_OPTION(new_hashed_relocation, s)) { new_hashed_relocation(hint); } + /* dirid grouping works only on unformatted nodes */ if (!unfm_hint && !hint->formatted_node && TEST_OPTION(dirid_groups, s)) { dirid_groups(hint); @@ -1080,8 +1140,6 @@ static int determine_prealloc_size(reiserfs_blocknr_hint_t * hint) return CARRY_ON; } -/* XXX I know it could be merged with upper-level function; - but may be result function would be too complex. */ static inline int allocate_without_wrapping_disk(reiserfs_blocknr_hint_t * hint, b_blocknr_t * new_blocknrs, b_blocknr_t start, @@ -1109,7 +1167,10 @@ static inline int allocate_without_wrapping_disk(reiserfs_blocknr_hint_t * hint, /* do we have something to fill prealloc. array also ? */ if (nr_allocated > 0) { - /* it means prealloc_size was greater that 0 and we do preallocation */ + /* + * it means prealloc_size was greater that 0 and + * we do preallocation + */ list_add(&REISERFS_I(hint->inode)->i_prealloc_list, &SB_JOURNAL(hint->th->t_super)-> j_prealloc_list); @@ -1177,7 +1238,8 @@ static inline int blocknrs_and_prealloc_arrays_from_search_start start = 0; finish = hint->beg; break; - default: /* We've tried searching everywhere, not enough space */ + default: + /* We've tried searching everywhere, not enough space */ /* Free the blocks */ if (!hint->formatted_node) { #ifdef REISERQUOTA_DEBUG @@ -1262,8 +1324,11 @@ static int use_preallocated_list_if_available(reiserfs_blocknr_hint_t * hint, return amount_needed; } -int reiserfs_allocate_blocknrs(reiserfs_blocknr_hint_t * hint, b_blocknr_t * new_blocknrs, int amount_needed, int reserved_by_us /* Amount of blocks we have - already reserved */ ) +int reiserfs_allocate_blocknrs(reiserfs_blocknr_hint_t *hint, + b_blocknr_t *new_blocknrs, + int amount_needed, + /* Amount of blocks we have already reserved */ + int reserved_by_us) { int initial_amount_needed = amount_needed; int ret; @@ -1275,15 +1340,21 @@ int reiserfs_allocate_blocknrs(reiserfs_blocknr_hint_t * hint, b_blocknr_t * new return NO_DISK_SPACE; /* should this be if !hint->inode && hint->preallocate? */ /* do you mean hint->formatted_node can be removed ? - Zam */ - /* hint->formatted_node cannot be removed because we try to access - inode information here, and there is often no inode assotiated with - metadata allocations - green */ + /* + * hint->formatted_node cannot be removed because we try to access + * inode information here, and there is often no inode associated with + * metadata allocations - green + */ if (!hint->formatted_node && hint->preallocate) { amount_needed = use_preallocated_list_if_available (hint, new_blocknrs, amount_needed); - if (amount_needed == 0) /* all blocknrs we need we got from - prealloc. list */ + + /* + * We have all the block numbers we need from the + * prealloc list + */ + if (amount_needed == 0) return CARRY_ON; new_blocknrs += (initial_amount_needed - amount_needed); } @@ -1297,10 +1368,12 @@ int reiserfs_allocate_blocknrs(reiserfs_blocknr_hint_t * hint, b_blocknr_t * new ret = blocknrs_and_prealloc_arrays_from_search_start (hint, new_blocknrs, amount_needed); - /* we used prealloc. list to fill (partially) new_blocknrs array. If final allocation fails we - * need to return blocks back to prealloc. list or just free them. -- Zam (I chose second - * variant) */ - + /* + * We used prealloc. list to fill (partially) new_blocknrs array. + * If final allocation fails we need to return blocks back to + * prealloc. list or just free them. -- Zam (I chose second + * variant) + */ if (ret != CARRY_ON) { while (amount_needed++ < initial_amount_needed) { reiserfs_free_block(hint->th, hint->inode, @@ -1339,8 +1412,10 @@ struct buffer_head *reiserfs_read_bitmap_block(struct super_block *sb, struct reiserfs_bitmap_info *info = SB_AP_BITMAP(sb) + bitmap; struct buffer_head *bh; - /* Way old format filesystems had the bitmaps packed up front. - * I doubt there are any of these left, but just in case... */ + /* + * Way old format filesystems had the bitmaps packed up front. + * I doubt there are any of these left, but just in case... + */ if (unlikely(test_bit(REISERFS_OLD_FORMAT, &(REISERFS_SB(sb)->s_properties)))) block = REISERFS_SB(sb)->s_sbh->b_blocknr + 1 + bitmap; diff --git a/fs/reiserfs/dir.c b/fs/reiserfs/dir.c index 1fe5cdeb5862..8d51f28d6345 100644 --- a/fs/reiserfs/dir.c +++ b/fs/reiserfs/dir.c @@ -59,7 +59,10 @@ static inline bool is_privroot_deh(struct inode *dir, struct reiserfs_de_head *d int reiserfs_readdir_inode(struct inode *inode, struct dir_context *ctx) { - struct cpu_key pos_key; /* key of current position in the directory (key of directory entry) */ + + /* key of current position in the directory (key of directory entry) */ + struct cpu_key pos_key; + INITIALIZE_PATH(path_to_entry); struct buffer_head *bh; int item_num, entry_num; @@ -77,21 +80,28 @@ int reiserfs_readdir_inode(struct inode *inode, struct dir_context *ctx) reiserfs_check_lock_depth(inode->i_sb, "readdir"); - /* form key for search the next directory entry using f_pos field of - file structure */ + /* + * form key for search the next directory entry using + * f_pos field of file structure + */ make_cpu_key(&pos_key, inode, ctx->pos ?: DOT_OFFSET, TYPE_DIRENTRY, 3); next_pos = cpu_key_k_offset(&pos_key); path_to_entry.reada = PATH_READA; while (1) { research: - /* search the directory item, containing entry with specified key */ + /* + * search the directory item, containing entry with + * specified key + */ search_res = search_by_entry_key(inode->i_sb, &pos_key, &path_to_entry, &de); if (search_res == IO_ERROR) { - // FIXME: we could just skip part of directory which could - // not be read + /* + * FIXME: we could just skip part of directory + * which could not be read + */ ret = -EIO; goto out; } @@ -109,14 +119,20 @@ int reiserfs_readdir_inode(struct inode *inode, struct dir_context *ctx) "vs-9005 item_num == %d, item amount == %d", item_num, B_NR_ITEMS(bh)); - /* and entry must be not more than number of entries in the item */ + /* + * and entry must be not more than number of entries + * in the item + */ RFALSE(ih_entry_count(ih) < entry_num, "vs-9010: entry number is too big %d (%d)", entry_num, ih_entry_count(ih)); + /* + * go through all entries in the directory item beginning + * from the entry, that has been found + */ if (search_res == POSITION_FOUND || entry_num < ih_entry_count(ih)) { - /* go through all entries in the directory item beginning from the entry, that has been found */ struct reiserfs_de_head *deh = B_I_DEH(bh, ih) + entry_num; @@ -127,16 +143,18 @@ int reiserfs_readdir_inode(struct inode *inode, struct dir_context *ctx) ino_t d_ino; loff_t cur_pos = deh_offset(deh); + /* it is hidden entry */ if (!de_visible(deh)) - /* it is hidden entry */ continue; d_reclen = entry_length(bh, ih, entry_num); d_name = B_I_DEH_ENTRY_FILE_NAME(bh, ih, deh); if (d_reclen <= 0 || d_name + d_reclen > bh->b_data + bh->b_size) { - /* There is corrupted data in entry, - * We'd better stop here */ + /* + * There is corrupted data in entry, + * We'd better stop here + */ pathrelse(&path_to_entry); ret = -EIO; goto out; @@ -145,10 +163,10 @@ int reiserfs_readdir_inode(struct inode *inode, struct dir_context *ctx) if (!d_name[d_reclen - 1]) d_reclen = strlen(d_name); + /* too big to send back to VFS */ if (d_reclen > REISERFS_MAX_NAME(inode->i_sb-> s_blocksize)) { - /* too big to send back to VFS */ continue; } @@ -173,10 +191,14 @@ int reiserfs_readdir_inode(struct inode *inode, struct dir_context *ctx) goto research; } } - // Note, that we copy name to user space via temporary - // buffer (local_buf) because filldir will block if - // user space buffer is swapped out. At that time - // entry can move to somewhere else + + /* + * Note, that we copy name to user space via + * temporary buffer (local_buf) because + * filldir will block if user space buffer is + * swapped out. At that time entry can move to + * somewhere else + */ memcpy(local_buf, d_name, d_reclen); /* @@ -209,22 +231,26 @@ int reiserfs_readdir_inode(struct inode *inode, struct dir_context *ctx) } /* for */ } + /* end of directory has been reached */ if (item_num != B_NR_ITEMS(bh) - 1) - // end of directory has been reached goto end; - /* item we went through is last item of node. Using right - delimiting key check is it directory end */ + /* + * item we went through is last item of node. Using right + * delimiting key check is it directory end + */ rkey = get_rkey(&path_to_entry, inode->i_sb); if (!comp_le_keys(rkey, &MIN_KEY)) { - /* set pos_key to key, that is the smallest and greater - that key of the last entry in the item */ + /* + * set pos_key to key, that is the smallest and greater + * that key of the last entry in the item + */ set_cpu_key_k_offset(&pos_key, next_pos); continue; } + /* end of directory has been reached */ if (COMP_SHORT_KEYS(rkey, &pos_key)) { - // end of directory has been reached goto end; } @@ -248,9 +274,10 @@ static int reiserfs_readdir(struct file *file, struct dir_context *ctx) return reiserfs_readdir_inode(file_inode(file), ctx); } -/* compose directory item containing "." and ".." entries (entries are - not aligned to 4 byte boundary) */ -/* the last four params are LE */ +/* + * compose directory item containing "." and ".." entries (entries are + * not aligned to 4 byte boundary) + */ void make_empty_dir_item_v1(char *body, __le32 dirid, __le32 objid, __le32 par_dirid, __le32 par_objid) { diff --git a/fs/reiserfs/do_balan.c b/fs/reiserfs/do_balan.c index 80b2b1b37169..399b2009b677 100644 --- a/fs/reiserfs/do_balan.c +++ b/fs/reiserfs/do_balan.c @@ -2,18 +2,13 @@ * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README */ -/* Now we have all buffers that must be used in balancing of the tree */ -/* Further calculations can not cause schedule(), and thus the buffer */ -/* tree will be stable until the balancing will be finished */ -/* balance the tree according to the analysis made before, */ -/* and using buffers obtained after all above. */ - -/** - ** balance_leaf_when_delete - ** balance_leaf - ** do_balance - ** - **/ +/* + * Now we have all buffers that must be used in balancing of the tree + * Further calculations can not cause schedule(), and thus the buffer + * tree will be stable until the balancing will be finished + * balance the tree according to the analysis made before, + * and using buffers obtained after all above. + */ #include <asm/uaccess.h> #include <linux/time.h> @@ -68,35 +63,39 @@ inline void do_balance_mark_leaf_dirty(struct tree_balance *tb, #define do_balance_mark_internal_dirty do_balance_mark_leaf_dirty #define do_balance_mark_sb_dirty do_balance_mark_leaf_dirty -/* summary: - if deleting something ( tb->insert_size[0] < 0 ) - return(balance_leaf_when_delete()); (flag d handled here) - else - if lnum is larger than 0 we put items into the left node - if rnum is larger than 0 we put items into the right node - if snum1 is larger than 0 we put items into the new node s1 - if snum2 is larger than 0 we put items into the new node s2 -Note that all *num* count new items being created. - -It would be easier to read balance_leaf() if each of these summary -lines was a separate procedure rather than being inlined. I think -that there are many passages here and in balance_leaf_when_delete() in -which two calls to one procedure can replace two passages, and it -might save cache space and improve software maintenance costs to do so. - -Vladimir made the perceptive comment that we should offload most of -the decision making in this function into fix_nodes/check_balance, and -then create some sort of structure in tb that says what actions should -be performed by do_balance. - --Hans */ - -/* Balance leaf node in case of delete or cut: insert_size[0] < 0 +/* + * summary: + * if deleting something ( tb->insert_size[0] < 0 ) + * return(balance_leaf_when_delete()); (flag d handled here) + * else + * if lnum is larger than 0 we put items into the left node + * if rnum is larger than 0 we put items into the right node + * if snum1 is larger than 0 we put items into the new node s1 + * if snum2 is larger than 0 we put items into the new node s2 + * Note that all *num* count new items being created. + * + * It would be easier to read balance_leaf() if each of these summary + * lines was a separate procedure rather than being inlined. I think + * that there are many passages here and in balance_leaf_when_delete() in + * which two calls to one procedure can replace two passages, and it + * might save cache space and improve software maintenance costs to do so. + * + * Vladimir made the perceptive comment that we should offload most of + * the decision making in this function into fix_nodes/check_balance, and + * then create some sort of structure in tb that says what actions should + * be performed by do_balance. + * + * -Hans + */ + +/* + * Balance leaf node in case of delete or cut: insert_size[0] < 0 * * lnum, rnum can have values >= -1 * -1 means that the neighbor must be joined with S * 0 means that nothing should be done with the neighbor - * >0 means to shift entirely or partly the specified number of items to the neighbor + * >0 means to shift entirely or partly the specified number of items + * to the neighbor */ static int balance_leaf_when_delete(struct tree_balance *tb, int flag) { @@ -149,8 +148,16 @@ static int balance_leaf_when_delete(struct tree_balance *tb, int flag) case M_CUT:{ /* cut item in S[0] */ if (is_direntry_le_ih(ih)) { - /* UFS unlink semantics are such that you can only delete one directory entry at a time. */ - /* when we cut a directory tb->insert_size[0] means number of entries to be cut (always 1) */ + /* + * UFS unlink semantics are such that you + * can only delete one directory entry at + * a time. + */ + + /* + * when we cut a directory tb->insert_size[0] + * means number of entries to be cut (always 1) + */ tb->insert_size[0] = -1; leaf_cut_from_buffer(&bi, item_pos, pos_in_item, -tb->insert_size[0]); @@ -183,13 +190,22 @@ static int balance_leaf_when_delete(struct tree_balance *tb, int flag) "UNKNOWN"), flag); } - /* the rule is that no shifting occurs unless by shifting a node can be freed */ + /* + * the rule is that no shifting occurs unless by shifting + * a node can be freed + */ n = B_NR_ITEMS(tbS0); - if (tb->lnum[0]) { /* L[0] takes part in balancing */ - if (tb->lnum[0] == -1) { /* L[0] must be joined with S[0] */ - if (tb->rnum[0] == -1) { /* R[0] must be also joined with S[0] */ + /* L[0] takes part in balancing */ + if (tb->lnum[0]) { + /* L[0] must be joined with S[0] */ + if (tb->lnum[0] == -1) { + /* R[0] must be also joined with S[0] */ + if (tb->rnum[0] == -1) { if (tb->FR[0] == PATH_H_PPARENT(tb->tb_path, 0)) { - /* all contents of all the 3 buffers will be in L[0] */ + /* + * all contents of all the 3 buffers + * will be in L[0] + */ if (PATH_H_POSITION(tb->tb_path, 1) == 0 && 1 < B_NR_ITEMS(tb->FR[0])) replace_key(tb, tb->CFL[0], @@ -208,7 +224,10 @@ static int balance_leaf_when_delete(struct tree_balance *tb, int flag) return 0; } - /* all contents of all the 3 buffers will be in R[0] */ + /* + * all contents of all the 3 buffers will + * be in R[0] + */ leaf_move_items(LEAF_FROM_S_TO_R, tb, n, -1, NULL); leaf_move_items(LEAF_FROM_L_TO_R, tb, @@ -233,7 +252,11 @@ static int balance_leaf_when_delete(struct tree_balance *tb, int flag) return 0; } - /* a part of contents of S[0] will be in L[0] and the rest part of S[0] will be in R[0] */ + + /* + * a part of contents of S[0] will be in L[0] and the + * rest part of S[0] will be in R[0] + */ RFALSE((tb->lnum[0] + tb->rnum[0] < n) || (tb->lnum[0] + tb->rnum[0] > n + 1), @@ -1178,9 +1201,7 @@ struct buffer_head *get_FEB(struct tree_balance *tb) return tb->used[i]; } -/* This is now used because reiserfs_free_block has to be able to -** schedule. -*/ +/* This is now used because reiserfs_free_block has to be able to schedule. */ static void store_thrown(struct tree_balance *tb, struct buffer_head *bh) { int i; @@ -1335,8 +1356,10 @@ static int check_before_balancing(struct tree_balance *tb) "mount point."); } - /* double check that buffers that we will modify are unlocked. (fix_nodes should already have - prepped all of these for us). */ + /* + * double check that buffers that we will modify are unlocked. + * (fix_nodes should already have prepped all of these for us). + */ if (tb->lnum[0]) { retval |= locked_or_not_in_tree(tb, tb->L[0], "L[0]"); retval |= locked_or_not_in_tree(tb, tb->FL[0], "FL[0]"); @@ -1429,49 +1452,51 @@ static void check_internal_levels(struct tree_balance *tb) #endif -/* Now we have all of the buffers that must be used in balancing of - the tree. We rely on the assumption that schedule() will not occur - while do_balance works. ( Only interrupt handlers are acceptable.) - We balance the tree according to the analysis made before this, - using buffers already obtained. For SMP support it will someday be - necessary to add ordered locking of tb. */ - -/* Some interesting rules of balancing: - - we delete a maximum of two nodes per level per balancing: we never - delete R, when we delete two of three nodes L, S, R then we move - them into R. - - we only delete L if we are deleting two nodes, if we delete only - one node we delete S - - if we shift leaves then we shift as much as we can: this is a - deliberate policy of extremism in node packing which results in - higher average utilization after repeated random balance operations - at the cost of more memory copies and more balancing as a result of - small insertions to full nodes. - - if we shift internal nodes we try to evenly balance the node - utilization, with consequent less balancing at the cost of lower - utilization. - - one could argue that the policy for directories in leaves should be - that of internal nodes, but we will wait until another day to - evaluate this.... It would be nice to someday measure and prove - these assumptions as to what is optimal.... +/* + * Now we have all of the buffers that must be used in balancing of + * the tree. We rely on the assumption that schedule() will not occur + * while do_balance works. ( Only interrupt handlers are acceptable.) + * We balance the tree according to the analysis made before this, + * using buffers already obtained. For SMP support it will someday be + * necessary to add ordered locking of tb. + */ -*/ +/* + * Some interesting rules of balancing: + * we delete a maximum of two nodes per level per balancing: we never + * delete R, when we delete two of three nodes L, S, R then we move + * them into R. + * + * we only delete L if we are deleting two nodes, if we delete only + * one node we delete S + * + * if we shift leaves then we shift as much as we can: this is a + * deliberate policy of extremism in node packing which results in + * higher average utilization after repeated random balance operations + * at the cost of more memory copies and more balancing as a result of + * small insertions to full nodes. + * + * if we shift internal nodes we try to evenly balance the node + * utilization, with consequent less balancing at the cost of lower + * utilization. + * + * one could argue that the policy for directories in leaves should be + * that of internal nodes, but we will wait until another day to + * evaluate this.... It would be nice to someday measure and prove + * these assumptions as to what is optimal.... + */ static inline void do_balance_starts(struct tree_balance *tb) { - /* use print_cur_tb() to see initial state of struct - tree_balance */ + /* use print_cur_tb() to see initial state of struct tree_balance */ /* store_print_tb (tb); */ /* do not delete, just comment it out */ -/* print_tb(flag, PATH_LAST_POSITION(tb->tb_path), tb->tb_path->pos_in_item, tb, - "check");*/ + /* + print_tb(flag, PATH_LAST_POSITION(tb->tb_path), + tb->tb_path->pos_in_item, tb, "check"); + */ RFALSE(check_before_balancing(tb), "PAP-12340: locked buffers in TB"); #ifdef CONFIG_REISERFS_CHECK REISERFS_SB(tb->tb_sb)->cur_tb = tb; @@ -1487,9 +1512,10 @@ static inline void do_balance_completed(struct tree_balance *tb) REISERFS_SB(tb->tb_sb)->cur_tb = NULL; #endif - /* reiserfs_free_block is no longer schedule safe. So, we need to - ** put the buffers we want freed on the thrown list during do_balance, - ** and then free them now + /* + * reiserfs_free_block is no longer schedule safe. So, we need to + * put the buffers we want freed on the thrown list during do_balance, + * and then free them now */ REISERFS_SB(tb->tb_sb)->s_do_balance++; @@ -1500,36 +1526,40 @@ static inline void do_balance_completed(struct tree_balance *tb) free_thrown(tb); } -void do_balance(struct tree_balance *tb, /* tree_balance structure */ - struct item_head *ih, /* item header of inserted item */ - const char *body, /* body of inserted item or bytes to paste */ - int flag) -{ /* i - insert, d - delete - c - cut, p - paste - - Cut means delete part of an item - (includes removing an entry from a - directory). - - Delete means delete whole item. - - Insert means add a new item into the - tree. - - Paste means to append to the end of an - existing file or to insert a directory - entry. */ - int child_pos, /* position of a child node in its parent */ - h; /* level of the tree being processed */ - struct item_head insert_key[2]; /* in our processing of one level - we sometimes determine what - must be inserted into the next - higher level. This insertion - consists of a key or two keys - and their corresponding - pointers */ - struct buffer_head *insert_ptr[2]; /* inserted node-ptrs for the next - level */ +/* + * do_balance - balance the tree + * + * @tb: tree_balance structure + * @ih: item header of inserted item + * @body: body of inserted item or bytes to paste + * @flag: 'i' - insert, 'd' - delete, 'c' - cut, 'p' paste + * + * Cut means delete part of an item (includes removing an entry from a + * directory). + * + * Delete means delete whole item. + * + * Insert means add a new item into the tree. + * + * Paste means to append to the end of an existing file or to + * insert a directory entry. + */ +void do_balance(struct tree_balance *tb, struct item_head *ih, + const char *body, int flag) +{ + int child_pos; /* position of a child node in its parent */ + int h; /* level of the tree being processed */ + + /* + * in our processing of one level we sometimes determine what + * must be inserted into the next higher level. This insertion + * consists of a key or two keys and their corresponding + * pointers + */ + struct item_head insert_key[2]; + + /* inserted node-ptrs for the next level */ + struct buffer_head *insert_ptr[2]; tb->tb_mode = flag; tb->need_balance_dirty = 0; @@ -1549,9 +1579,11 @@ void do_balance(struct tree_balance *tb, /* tree_balance structure */ atomic_inc(&(fs_generation(tb->tb_sb))); do_balance_starts(tb); - /* balance leaf returns 0 except if combining L R and S into - one node. see balance_internal() for explanation of this - line of code. */ + /* + * balance_leaf returns 0 except if combining L R and S into + * one node. see balance_internal() for explanation of this + * line of code. + */ child_pos = PATH_H_B_ITEM_ORDER(tb->tb_path, 0) + balance_leaf(tb, ih, body, flag, insert_key, insert_ptr); diff --git a/fs/reiserfs/file.c b/fs/reiserfs/file.c index ed58d843d578..27399430664e 100644 --- a/fs/reiserfs/file.c +++ b/fs/reiserfs/file.c @@ -15,20 +15,20 @@ #include <linux/quotaops.h> /* -** We pack the tails of files on file close, not at the time they are written. -** This implies an unnecessary copy of the tail and an unnecessary indirect item -** insertion/balancing, for files that are written in one write. -** It avoids unnecessary tail packings (balances) for files that are written in -** multiple writes and are small enough to have tails. -** -** file_release is called by the VFS layer when the file is closed. If -** this is the last open file descriptor, and the file -** small enough to have a tail, and the tail is currently in an -** unformatted node, the tail is converted back into a direct item. -** -** We use reiserfs_truncate_file to pack the tail, since it already has -** all the conditions coded. -*/ + * We pack the tails of files on file close, not at the time they are written. + * This implies an unnecessary copy of the tail and an unnecessary indirect item + * insertion/balancing, for files that are written in one write. + * It avoids unnecessary tail packings (balances) for files that are written in + * multiple writes and are small enough to have tails. + * + * file_release is called by the VFS layer when the file is closed. If + * this is the last open file descriptor, and the file + * small enough to have a tail, and the tail is currently in an + * unformatted node, the tail is converted back into a direct item. + * + * We use reiserfs_truncate_file to pack the tail, since it already has + * all the conditions coded. + */ static int reiserfs_file_release(struct inode *inode, struct file *filp) { @@ -57,14 +57,16 @@ static int reiserfs_file_release(struct inode *inode, struct file *filp) } reiserfs_write_lock(inode->i_sb); - /* freeing preallocation only involves relogging blocks that + /* + * freeing preallocation only involves relogging blocks that * are already in the current transaction. preallocation gets * freed at the end of each transaction, so it is impossible for * us to log any additional blocks (including quota blocks) */ err = journal_begin(&th, inode->i_sb, 1); if (err) { - /* uh oh, we can't allow the inode to go away while there + /* + * uh oh, we can't allow the inode to go away while there * is still preallocation blocks pending. Try to join the * aborted transaction */ @@ -72,11 +74,13 @@ static int reiserfs_file_release(struct inode *inode, struct file *filp) err = journal_join_abort(&th, inode->i_sb, 1); if (err) { - /* hmpf, our choices here aren't good. We can pin the inode - * which will disallow unmount from every happening, we can - * do nothing, which will corrupt random memory on unmount, - * or we can forcibly remove the file from the preallocation - * list, which will leak blocks on disk. Lets pin the inode + /* + * hmpf, our choices here aren't good. We can pin + * the inode which will disallow unmount from ever + * happening, we can do nothing, which will corrupt + * random memory on unmount, or we can forcibly + * remove the file from the preallocation list, which + * will leak blocks on disk. Lets pin the inode * and let the admin know what is going on. */ igrab(inode); @@ -102,10 +106,12 @@ static int reiserfs_file_release(struct inode *inode, struct file *filp) (REISERFS_I(inode)->i_flags & i_pack_on_close_mask) && tail_has_to_be_packed(inode)) { - /* if regular file is released by last holder and it has been - appended (we append by unformatted node only) or its direct - item(s) had to be converted, then it may have to be - indirect2direct converted */ + /* + * if regular file is released by last holder and it has been + * appended (we append by unformatted node only) or its direct + * item(s) had to be converted, then it may have to be + * indirect2direct converted + */ err = reiserfs_truncate_file(inode, 0); } out: @@ -117,8 +123,9 @@ static int reiserfs_file_release(struct inode *inode, struct file *filp) static int reiserfs_file_open(struct inode *inode, struct file *file) { int err = dquot_file_open(inode, file); + + /* somebody might be tailpacking on final close; wait for it */ if (!atomic_inc_not_zero(&REISERFS_I(inode)->openers)) { - /* somebody might be tailpacking on final close; wait for it */ mutex_lock(&(REISERFS_I(inode)->tailpack)); atomic_inc(&REISERFS_I(inode)->openers); mutex_unlock(&(REISERFS_I(inode)->tailpack)); @@ -208,7 +215,8 @@ int reiserfs_commit_page(struct inode *inode, struct page *page, journal_mark_dirty(&th, s, bh); } else if (!buffer_dirty(bh)) { mark_buffer_dirty(bh); - /* do data=ordered on any page past the end + /* + * do data=ordered on any page past the end * of file and any buffer marked BH_New. */ if (reiserfs_data_ordered(inode->i_sb) && diff --git a/fs/reiserfs/fix_node.c b/fs/reiserfs/fix_node.c index b6a05a7f4658..144bd62c3e39 100644 --- a/fs/reiserfs/fix_node.c +++ b/fs/reiserfs/fix_node.c @@ -2,59 +2,32 @@ * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README */ -/** - ** old_item_num - ** old_entry_num - ** set_entry_sizes - ** create_virtual_node - ** check_left - ** check_right - ** directory_part_size - ** get_num_ver - ** set_parameters - ** is_leaf_removable - ** are_leaves_removable - ** get_empty_nodes - ** get_lfree - ** get_rfree - ** is_left_neighbor_in_cache - ** decrement_key - ** get_far_parent - ** get_parents - ** can_node_be_removed - ** ip_check_balance - ** dc_check_balance_internal - ** dc_check_balance_leaf - ** dc_check_balance - ** check_balance - ** get_direct_parent - ** get_neighbors - ** fix_nodes - ** - ** - **/ - #include <linux/time.h> #include <linux/slab.h> #include <linux/string.h> #include "reiserfs.h" #include <linux/buffer_head.h> -/* To make any changes in the tree we find a node, that contains item - to be changed/deleted or position in the node we insert a new item - to. We call this node S. To do balancing we need to decide what we - will shift to left/right neighbor, or to a new node, where new item - will be etc. To make this analysis simpler we build virtual - node. Virtual node is an array of items, that will replace items of - node S. (For instance if we are going to delete an item, virtual - node does not contain it). Virtual node keeps information about - item sizes and types, mergeability of first and last items, sizes - of all entries in directory item. We use this array of items when - calculating what we can shift to neighbors and how many nodes we - have to have if we do not any shiftings, if we shift to left/right - neighbor or to both. */ - -/* taking item number in virtual node, returns number of item, that it has in source buffer */ +/* + * To make any changes in the tree we find a node that contains item + * to be changed/deleted or position in the node we insert a new item + * to. We call this node S. To do balancing we need to decide what we + * will shift to left/right neighbor, or to a new node, where new item + * will be etc. To make this analysis simpler we build virtual + * node. Virtual node is an array of items, that will replace items of + * node S. (For instance if we are going to delete an item, virtual + * node does not contain it). Virtual node keeps information about + * item sizes and types, mergeability of first and last items, sizes + * of all entries in directory item. We use this array of items when + * calculating what we can shift to neighbors and how many nodes we + * have to have if we do not any shiftings, if we shift to left/right + * neighbor or to both. + */ + +/* + * Takes item number in virtual node, returns number of item + * that it has in source buffer + */ static inline int old_item_num(int new_num, int affected_item_num, int mode) { if (mode == M_PASTE || mode == M_CUT || new_num < affected_item_num) @@ -112,7 +85,10 @@ static void create_virtual_node(struct tree_balance *tb, int h) && (vn->vn_mode != M_DELETE || vn->vn_affected_item_num)) vn->vn_vi[0].vi_type |= VI_TYPE_LEFT_MERGEABLE; - /* go through all items those remain in the virtual node (except for the new (inserted) one) */ + /* + * go through all items that remain in the virtual + * node (except for the new (inserted) one) + */ for (new_num = 0; new_num < vn->vn_nr_item; new_num++) { int j; struct virtual_item *vi = vn->vn_vi + new_num; @@ -131,8 +107,10 @@ static void create_virtual_node(struct tree_balance *tb, int h) vi->vi_item = ih_item_body(Sh, ih + j); vi->vi_uarea = vn->vn_free_ptr; - // FIXME: there is no check, that item operation did not - // consume too much memory + /* + * FIXME: there is no check that item operation did not + * consume too much memory + */ vn->vn_free_ptr += op_create_vi(vn, vi, is_affected, tb->insert_size[0]); if (tb->vn_buf + tb->vn_buf_size < vn->vn_free_ptr) @@ -145,7 +123,8 @@ static void create_virtual_node(struct tree_balance *tb, int h) if (vn->vn_mode == M_PASTE || vn->vn_mode == M_CUT) { vn->vn_vi[new_num].vi_item_len += tb->insert_size[0]; - vi->vi_new_data = vn->vn_data; // pointer to data which is going to be pasted + /* pointer to data which is going to be pasted */ + vi->vi_new_data = vn->vn_data; } } @@ -164,7 +143,10 @@ static void create_virtual_node(struct tree_balance *tb, int h) tb->insert_size[0]); } - /* set right merge flag we take right delimiting key and check whether it is a mergeable item */ + /* + * set right merge flag we take right delimiting key and + * check whether it is a mergeable item + */ if (tb->CFR[0]) { struct reiserfs_key *key; @@ -179,12 +161,19 @@ static void create_virtual_node(struct tree_balance *tb, int h) if (op_is_left_mergeable(key, Sh->b_size) && !(vn->vn_mode != M_DELETE || vn->vn_affected_item_num != B_NR_ITEMS(Sh) - 1)) { - /* we delete last item and it could be merged with right neighbor's first item */ + /* + * we delete last item and it could be merged + * with right neighbor's first item + */ if (! (B_NR_ITEMS(Sh) == 1 && is_direntry_le_ih(item_head(Sh, 0)) && ih_entry_count(item_head(Sh, 0)) == 1)) { - /* node contains more than 1 item, or item is not directory item, or this item contains more than 1 entry */ + /* + * node contains more than 1 item, or item + * is not directory item, or this item + * contains more than 1 entry + */ print_block(Sh, 0, -1, -1); reiserfs_panic(tb->tb_sb, "vs-8045", "rdkey %k, affected item==%d " @@ -198,8 +187,10 @@ static void create_virtual_node(struct tree_balance *tb, int h) } } -/* using virtual node check, how many items can be shifted to left - neighbor */ +/* + * Using virtual node check, how many items can be + * shifted to left neighbor + */ static void check_left(struct tree_balance *tb, int h, int cur_free) { int i; @@ -259,9 +250,13 @@ static void check_left(struct tree_balance *tb, int h, int cur_free) } /* the item cannot be shifted entirely, try to split it */ - /* check whether L[0] can hold ih and at least one byte of the item body */ + /* + * check whether L[0] can hold ih and at least one byte + * of the item body + */ + + /* cannot shift even a part of the current item */ if (cur_free <= ih_size) { - /* cannot shift even a part of the current item */ tb->lbytes = -1; return; } @@ -278,8 +273,10 @@ static void check_left(struct tree_balance *tb, int h, int cur_free) return; } -/* using virtual node check, how many items can be shifted to right - neighbor */ +/* + * Using virtual node check, how many items can be + * shifted to right neighbor + */ static void check_right(struct tree_balance *tb, int h, int cur_free) { int i; @@ -338,13 +335,21 @@ static void check_right(struct tree_balance *tb, int h, int cur_free) continue; } - /* check whether R[0] can hold ih and at least one byte of the item body */ - if (cur_free <= ih_size) { /* cannot shift even a part of the current item */ + /* + * check whether R[0] can hold ih and at least one + * byte of the item body + */ + + /* cannot shift even a part of the current item */ + if (cur_free <= ih_size) { tb->rbytes = -1; return; } - /* R[0] can hold the header of the item and at least one byte of its body */ + /* + * R[0] can hold the header of the item and at least + * one byte of its body + */ cur_free -= ih_size; /* cur_free is still > 0 */ tb->rbytes = op_check_right(vi, cur_free); @@ -361,45 +366,64 @@ static void check_right(struct tree_balance *tb, int h, int cur_free) /* * from - number of items, which are shifted to left neighbor entirely * to - number of item, which are shifted to right neighbor entirely - * from_bytes - number of bytes of boundary item (or directory entries) which are shifted to left neighbor - * to_bytes - number of bytes of boundary item (or directory entries) which are shifted to right neighbor */ + * from_bytes - number of bytes of boundary item (or directory entries) + * which are shifted to left neighbor + * to_bytes - number of bytes of boundary item (or directory entries) + * which are shifted to right neighbor + */ static int get_num_ver(int mode, struct tree_balance *tb, int h, int from, int from_bytes, int to, int to_bytes, short *snum012, int flow) { int i; int cur_free; - // int bytes; int units; struct virtual_node *vn = tb->tb_vn; - // struct virtual_item * vi; - int total_node_size, max_node_size, current_item_size; int needed_nodes; - int start_item, /* position of item we start filling node from */ - end_item, /* position of item we finish filling node by */ - start_bytes, /* number of first bytes (entries for directory) of start_item-th item - we do not include into node that is being filled */ - end_bytes; /* number of last bytes (entries for directory) of end_item-th item - we do node include into node that is being filled */ - int split_item_positions[2]; /* these are positions in virtual item of - items, that are split between S[0] and - S1new and S1new and S2new */ + + /* position of item we start filling node from */ + int start_item; + + /* position of item we finish filling node by */ + int end_item; + + /* + * number of first bytes (entries for directory) of start_item-th item + * we do not include into node that is being filled + */ + int start_bytes; + + /* + * number of last bytes (entries for directory) of end_item-th item + * we do node include into node that is being filled + */ + int end_bytes; + + /* + * these are positions in virtual item of items, that are split + * between S[0] and S1new and S1new and S2new + */ + int split_item_positions[2]; split_item_positions[0] = -1; split_item_positions[1] = -1; - /* We only create additional nodes if we are in insert or paste mode - or we are in replace mode at the internal level. If h is 0 and - the mode is M_REPLACE then in fix_nodes we change the mode to - paste or insert before we get here in the code. */ + /* + * We only create additional nodes if we are in insert or paste mode + * or we are in replace mode at the internal level. If h is 0 and + * the mode is M_REPLACE then in fix_nodes we change the mode to + * paste or insert before we get here in the code. + */ RFALSE(tb->insert_size[h] < 0 || (mode != M_INSERT && mode != M_PASTE), "vs-8100: insert_size < 0 in overflow"); max_node_size = MAX_CHILD_SIZE(PATH_H_PBUFFER(tb->tb_path, h)); - /* snum012 [0-2] - number of items, that lay - to S[0], first new node and second new node */ + /* + * snum012 [0-2] - number of items, that lay + * to S[0], first new node and second new node + */ snum012[3] = -1; /* s1bytes */ snum012[4] = -1; /* s2bytes */ @@ -416,20 +440,22 @@ static int get_num_ver(int mode, struct tree_balance *tb, int h, total_node_size = 0; cur_free = max_node_size; - // start from 'from'-th item + /* start from 'from'-th item */ start_item = from; - // skip its first 'start_bytes' units + /* skip its first 'start_bytes' units */ start_bytes = ((from_bytes != -1) ? from_bytes : 0); - // last included item is the 'end_item'-th one + /* last included item is the 'end_item'-th one */ end_item = vn->vn_nr_item - to - 1; - // do not count last 'end_bytes' units of 'end_item'-th item + /* do not count last 'end_bytes' units of 'end_item'-th item */ end_bytes = (to_bytes != -1) ? to_bytes : 0; - /* go through all item beginning from the start_item-th item and ending by - the end_item-th item. Do not count first 'start_bytes' units of - 'start_item'-th item and last 'end_bytes' of 'end_item'-th item */ - + /* + * go through all item beginning from the start_item-th item + * and ending by the end_item-th item. Do not count first + * 'start_bytes' units of 'start_item'-th item and last + * 'end_bytes' of 'end_item'-th item + */ for (i = start_item; i <= end_item; i++) { struct virtual_item *vi = vn->vn_vi + i; int skip_from_end = ((i == end_item) ? end_bytes : 0); @@ -439,7 +465,10 @@ static int get_num_ver(int mode, struct tree_balance *tb, int h, /* get size of current item */ current_item_size = vi->vi_item_len; - /* do not take in calculation head part (from_bytes) of from-th item */ + /* + * do not take in calculation head part (from_bytes) + * of from-th item + */ current_item_size -= op_part_size(vi, 0 /*from start */ , start_bytes); @@ -455,9 +484,11 @@ static int get_num_ver(int mode, struct tree_balance *tb, int h, continue; } + /* + * virtual item length is longer, than max size of item in + * a node. It is impossible for direct item + */ if (current_item_size > max_node_size) { - /* virtual item length is longer, than max size of item in - a node. It is impossible for direct item */ RFALSE(is_direct_le_ih(vi->vi_ih), "vs-8110: " "direct item length is %d. It can not be longer than %d", @@ -466,15 +497,18 @@ static int get_num_ver(int mode, struct tree_balance *tb, int h, flow = 1; } + /* as we do not split items, take new node and continue */ if (!flow) { - /* as we do not split items, take new node and continue */ needed_nodes++; i--; total_node_size = 0; continue; } - // calculate number of item units which fit into node being - // filled + + /* + * calculate number of item units which fit into node being + * filled + */ { int free_space; @@ -482,17 +516,17 @@ static int get_num_ver(int mode, struct tree_balance *tb, int h, units = op_check_left(vi, free_space, start_bytes, skip_from_end); + /* + * nothing fits into current node, take new + * node and continue + */ if (units == -1) { - /* nothing fits into current node, take new node and continue */ needed_nodes++, i--, total_node_size = 0; continue; } } /* something fits into the current node */ - //if (snum012[3] != -1 || needed_nodes != 1) - // reiserfs_panic (tb->tb_sb, "vs-8115: get_num_ver: too many nodes required"); - //snum012[needed_nodes - 1 + 3] = op_unit_num (vi) - start_bytes - units; start_bytes += units; snum012[needed_nodes - 1 + 3] = units; @@ -508,9 +542,11 @@ static int get_num_ver(int mode, struct tree_balance *tb, int h, total_node_size = 0; } - // sum012[4] (if it is not -1) contains number of units of which - // are to be in S1new, snum012[3] - to be in S0. They are supposed - // to be S1bytes and S2bytes correspondingly, so recalculate + /* + * sum012[4] (if it is not -1) contains number of units of which + * are to be in S1new, snum012[3] - to be in S0. They are supposed + * to be S1bytes and S2bytes correspondingly, so recalculate + */ if (snum012[4] > 0) { int split_item_num; int bytes_to_r, bytes_to_l; @@ -527,7 +563,7 @@ static int get_num_ver(int mode, struct tree_balance *tb, int h, ((split_item_positions[0] == split_item_positions[1]) ? snum012[3] : 0); - // s2bytes + /* s2bytes */ snum012[4] = op_unit_num(&vn->vn_vi[split_item_num]) - snum012[4] - bytes_to_r - bytes_to_l - bytes_to_S1new; @@ -555,7 +591,7 @@ static int get_num_ver(int mode, struct tree_balance *tb, int h, ((split_item_positions[0] == split_item_positions[1] && snum012[4] != -1) ? snum012[4] : 0); - // s1bytes + /* s1bytes */ snum012[3] = op_unit_num(&vn->vn_vi[split_item_num]) - snum012[3] - bytes_to_r - bytes_to_l - bytes_to_S2new; @@ -565,7 +601,8 @@ static int get_num_ver(int mode, struct tree_balance *tb, int h, } -/* Set parameters for balancing. +/* + * Set parameters for balancing. * Performs write of results of analysis of balancing into structure tb, * where it will later be used by the functions that actually do the balancing. * Parameters: @@ -575,11 +612,12 @@ static int get_num_ver(int mode, struct tree_balance *tb, int h, * rnum number of items from S[h] that must be shifted to R[h]; * blk_num number of blocks that S[h] will be splitted into; * s012 number of items that fall into splitted nodes. - * lbytes number of bytes which flow to the left neighbor from the item that is not - * not shifted entirely - * rbytes number of bytes which flow to the right neighbor from the item that is not - * not shifted entirely - * s1bytes number of bytes which flow to the first new node when S[0] splits (this number is contained in s012 array) + * lbytes number of bytes which flow to the left neighbor from the + * item that is not not shifted entirely + * rbytes number of bytes which flow to the right neighbor from the + * item that is not not shifted entirely + * s1bytes number of bytes which flow to the first new node when + * S[0] splits (this number is contained in s012 array) */ static void set_parameters(struct tree_balance *tb, int h, int lnum, @@ -590,7 +628,8 @@ static void set_parameters(struct tree_balance *tb, int h, int lnum, tb->rnum[h] = rnum; tb->blknum[h] = blk_num; - if (h == 0) { /* only for leaf level */ + /* only for leaf level */ + if (h == 0) { if (s012 != NULL) { tb->s0num = *s012++, tb->s1num = *s012++, tb->s2num = *s012++; @@ -607,8 +646,10 @@ static void set_parameters(struct tree_balance *tb, int h, int lnum, PROC_INFO_ADD(tb->tb_sb, rbytes[h], rb); } -/* check, does node disappear if we shift tb->lnum[0] items to left - neighbor and tb->rnum[0] to the right one. */ +/* + * check if node disappears if we shift tb->lnum[0] items to left + * neighbor and tb->rnum[0] to the right one. + */ static int is_leaf_removable(struct tree_balance *tb) { struct virtual_node *vn = tb->tb_vn; @@ -616,8 +657,10 @@ static int is_leaf_removable(struct tree_balance *tb) int size; int remain_items; - /* number of items, that will be shifted to left (right) neighbor - entirely */ + /* + * number of items that will be shifted to left (right) neighbor + * entirely + */ to_left = tb->lnum[0] - ((tb->lbytes != -1) ? 1 : 0); to_right = tb->rnum[0] - ((tb->rbytes != -1) ? 1 : 0); remain_items = vn->vn_nr_item; @@ -625,18 +668,18 @@ static int is_leaf_removable(struct tree_balance *tb) /* how many items remain in S[0] after shiftings to neighbors */ remain_items -= (to_left + to_right); + /* all content of node can be shifted to neighbors */ if (remain_items < 1) { - /* all content of node can be shifted to neighbors */ set_parameters(tb, 0, to_left, vn->vn_nr_item - to_left, 0, NULL, -1, -1); return 1; } + /* S[0] is not removable */ if (remain_items > 1 || tb->lbytes == -1 || tb->rbytes == -1) - /* S[0] is not removable */ return 0; - /* check, whether we can divide 1 remaining item between neighbors */ + /* check whether we can divide 1 remaining item between neighbors */ /* get size of remaining item (in item units) */ size = op_unit_num(&(vn->vn_vi[to_left])); @@ -680,18 +723,23 @@ static int are_leaves_removable(struct tree_balance *tb, int lfree, int rfree) && !comp_short_le_keys(&(ih->ih_key), internal_key(tb->CFR[0], tb->rkey[0]))) + /* + * Directory must be in correct state here: that is + * somewhere at the left side should exist first + * directory item. But the item being deleted can + * not be that first one because its right neighbor + * is item of the same directory. (But first item + * always gets deleted in last turn). So, neighbors + * of deleted item can be merged, so we can save + * ih_size + */ if (is_direntry_le_ih(ih)) { - /* Directory must be in correct state here: that is - somewhere at the left side should exist first directory - item. But the item being deleted can not be that first - one because its right neighbor is item of the same - directory. (But first item always gets deleted in last - turn). So, neighbors of deleted item can be merged, so - we can save ih_size */ ih_size = IH_SIZE; - /* we might check that left neighbor exists and is of the - same directory */ + /* + * we might check that left neighbor exists + * and is of the same directory + */ RFALSE(le_ih_k_offset(ih) == DOT_OFFSET, "vs-8130: first directory item can not be removed until directory is not empty"); } @@ -770,7 +818,8 @@ static void free_buffers_in_tb(struct tree_balance *tb) } } -/* Get new buffers for storing new nodes that are created while balancing. +/* + * Get new buffers for storing new nodes that are created while balancing. * Returns: SCHEDULE_OCCURRED - schedule occurred while the function worked; * CARRY_ON - schedule didn't occur while the function worked; * NO_DISK_SPACE - no disk space. @@ -778,28 +827,33 @@ static void free_buffers_in_tb(struct tree_balance *tb) /* The function is NOT SCHEDULE-SAFE! */ static int get_empty_nodes(struct tree_balance *tb, int h) { - struct buffer_head *new_bh, - *Sh = PATH_H_PBUFFER(tb->tb_path, h); + struct buffer_head *new_bh, *Sh = PATH_H_PBUFFER(tb->tb_path, h); b_blocknr_t *blocknr, blocknrs[MAX_AMOUNT_NEEDED] = { 0, }; - int counter, number_of_freeblk, amount_needed, /* number of needed empty blocks */ - retval = CARRY_ON; + int counter, number_of_freeblk; + int amount_needed; /* number of needed empty blocks */ + int retval = CARRY_ON; struct super_block *sb = tb->tb_sb; - /* number_of_freeblk is the number of empty blocks which have been - acquired for use by the balancing algorithm minus the number of - empty blocks used in the previous levels of the analysis, - number_of_freeblk = tb->cur_blknum can be non-zero if a schedule occurs - after empty blocks are acquired, and the balancing analysis is - then restarted, amount_needed is the number needed by this level - (h) of the balancing analysis. - - Note that for systems with many processes writing, it would be - more layout optimal to calculate the total number needed by all - levels and then to run reiserfs_new_blocks to get all of them at once. */ - - /* Initiate number_of_freeblk to the amount acquired prior to the restart of - the analysis or 0 if not restarted, then subtract the amount needed - by all of the levels of the tree below h. */ + /* + * number_of_freeblk is the number of empty blocks which have been + * acquired for use by the balancing algorithm minus the number of + * empty blocks used in the previous levels of the analysis, + * number_of_freeblk = tb->cur_blknum can be non-zero if a schedule + * occurs after empty blocks are acquired, and the balancing analysis + * is then restarted, amount_needed is the number needed by this + * level (h) of the balancing analysis. + * + * Note that for systems with many processes writing, it would be + * more layout optimal to calculate the total number needed by all + * levels and then to run reiserfs_new_blocks to get all of them at + * once. + */ + + /* + * Initiate number_of_freeblk to the amount acquired prior to the + * restart of the analysis or 0 if not restarted, then subtract the + * amount needed by all of the levels of the tree below h. + */ /* blknum includes S[h], so we subtract 1 in this calculation */ for (counter = 0, number_of_freeblk = tb->cur_blknum; counter < h; counter++) @@ -810,13 +864,19 @@ static int get_empty_nodes(struct tree_balance *tb, int h) /* Allocate missing empty blocks. */ /* if Sh == 0 then we are getting a new root */ amount_needed = (Sh) ? (tb->blknum[h] - 1) : 1; - /* Amount_needed = the amount that we need more than the amount that we have. */ + /* + * Amount_needed = the amount that we need more than the + * amount that we have. + */ if (amount_needed > number_of_freeblk) amount_needed -= number_of_freeblk; - else /* If we have enough already then there is nothing to do. */ + else /* If we have enough already then there is nothing to do. */ return CARRY_ON; - /* No need to check quota - is not allocated for blocks used for formatted nodes */ + /* + * No need to check quota - is not allocated for blocks used + * for formatted nodes + */ if (reiserfs_new_form_blocknrs(tb, blocknrs, amount_needed) == NO_DISK_SPACE) return NO_DISK_SPACE; @@ -849,8 +909,10 @@ static int get_empty_nodes(struct tree_balance *tb, int h) return retval; } -/* Get free space of the left neighbor, which is stored in the parent - * node of the left neighbor. */ +/* + * Get free space of the left neighbor, which is stored in the parent + * node of the left neighbor. + */ static int get_lfree(struct tree_balance *tb, int h) { struct buffer_head *l, *f; @@ -870,7 +932,8 @@ static int get_lfree(struct tree_balance *tb, int h) return (MAX_CHILD_SIZE(f) - dc_size(B_N_CHILD(f, order))); } -/* Get free space of the right neighbor, +/* + * Get free space of the right neighbor, * which is stored in the parent node of the right neighbor. */ static int get_rfree(struct tree_balance *tb, int h) @@ -916,7 +979,10 @@ static int is_left_neighbor_in_cache(struct tree_balance *tb, int h) "vs-8165: F[h] (%b) or FL[h] (%b) is invalid", father, tb->FL[h]); - /* Get position of the pointer to the left neighbor into the left father. */ + /* + * Get position of the pointer to the left neighbor + * into the left father. + */ left_neighbor_position = (father == tb->FL[h]) ? tb->lkey[h] : B_NR_ITEMS(tb->FL[h]); /* Get left neighbor block number. */ @@ -940,17 +1006,20 @@ static int is_left_neighbor_in_cache(struct tree_balance *tb, int h) static void decrement_key(struct cpu_key *key) { - // call item specific function for this key + /* call item specific function for this key */ item_ops[cpu_key_k_type(key)]->decrement_key(key); } -/* Calculate far left/right parent of the left/right neighbor of the current node, that - * is calculate the left/right (FL[h]/FR[h]) neighbor of the parent F[h]. +/* + * Calculate far left/right parent of the left/right neighbor of the + * current node, that is calculate the left/right (FL[h]/FR[h]) neighbor + * of the parent F[h]. * Calculate left/right common parent of the current node and L[h]/R[h]. * Calculate left/right delimiting key position. - * Returns: PATH_INCORRECT - path in the tree is not correct; - SCHEDULE_OCCURRED - schedule occurred while the function worked; - * CARRY_ON - schedule didn't occur while the function worked; + * Returns: PATH_INCORRECT - path in the tree is not correct + * SCHEDULE_OCCURRED - schedule occurred while the function worked + * CARRY_ON - schedule didn't occur while the function + * worked */ static int get_far_parent(struct tree_balance *tb, int h, @@ -966,8 +1035,10 @@ static int get_far_parent(struct tree_balance *tb, first_last_position = 0, path_offset = PATH_H_PATH_OFFSET(path, h); - /* Starting from F[h] go upwards in the tree, and look for the common - ancestor of F[h], and its neighbor l/r, that should be obtained. */ + /* + * Starting from F[h] go upwards in the tree, and look for the common + * ancestor of F[h], and its neighbor l/r, that should be obtained. + */ counter = path_offset; @@ -975,21 +1046,33 @@ static int get_far_parent(struct tree_balance *tb, "PAP-8180: invalid path length"); for (; counter > FIRST_PATH_ELEMENT_OFFSET; counter--) { - /* Check whether parent of the current buffer in the path is really parent in the tree. */ + /* + * Check whether parent of the current buffer in the path + * is really parent in the tree. + */ if (!B_IS_IN_TREE (parent = PATH_OFFSET_PBUFFER(path, counter - 1))) return REPEAT_SEARCH; + /* Check whether position in the parent is correct. */ if ((position = PATH_OFFSET_POSITION(path, counter - 1)) > B_NR_ITEMS(parent)) return REPEAT_SEARCH; - /* Check whether parent at the path really points to the child. */ + + /* + * Check whether parent at the path really points + * to the child. + */ if (B_N_CHILD_NUM(parent, position) != PATH_OFFSET_PBUFFER(path, counter)->b_blocknr) return REPEAT_SEARCH; - /* Return delimiting key if position in the parent is not equal to first/last one. */ + + /* + * Return delimiting key if position in the parent is not + * equal to first/last one. + */ if (c_lr_par == RIGHT_PARENTS) first_last_position = B_NR_ITEMS(parent); if (position != first_last_position) { @@ -1002,7 +1085,10 @@ static int get_far_parent(struct tree_balance *tb, /* if we are in the root of the tree, then there is no common father */ if (counter == FIRST_PATH_ELEMENT_OFFSET) { - /* Check whether first buffer in the path is the root of the tree. */ + /* + * Check whether first buffer in the path is the + * root of the tree. + */ if (PATH_OFFSET_PBUFFER (tb->tb_path, FIRST_PATH_ELEMENT_OFFSET)->b_blocknr == @@ -1031,8 +1117,11 @@ static int get_far_parent(struct tree_balance *tb, } } - /* So, we got common parent of the current node and its left/right neighbor. - Now we are geting the parent of the left/right neighbor. */ + /* + * So, we got common parent of the current node and its + * left/right neighbor. Now we are getting the parent of the + * left/right neighbor. + */ /* Form key to get parent of the left/right neighbor. */ le_key2cpu_key(&s_lr_father_key, @@ -1050,7 +1139,7 @@ static int get_far_parent(struct tree_balance *tb, if (search_by_key (tb->tb_sb, &s_lr_father_key, &s_path_to_neighbor_father, h + 1) == IO_ERROR) - // path is released + /* path is released */ return IO_ERROR; if (FILESYSTEM_CHANGED_TB(tb)) { @@ -1071,12 +1160,15 @@ static int get_far_parent(struct tree_balance *tb, return CARRY_ON; } -/* Get parents of neighbors of node in the path(S[path_offset]) and common parents of - * S[path_offset] and L[path_offset]/R[path_offset]: F[path_offset], FL[path_offset], - * FR[path_offset], CFL[path_offset], CFR[path_offset]. - * Calculate numbers of left and right delimiting keys position: lkey[path_offset], rkey[path_offset]. - * Returns: SCHEDULE_OCCURRED - schedule occurred while the function worked; - * CARRY_ON - schedule didn't occur while the function worked; +/* + * Get parents of neighbors of node in the path(S[path_offset]) and + * common parents of S[path_offset] and L[path_offset]/R[path_offset]: + * F[path_offset], FL[path_offset], FR[path_offset], CFL[path_offset], + * CFR[path_offset]. + * Calculate numbers of left and right delimiting keys position: + * lkey[path_offset], rkey[path_offset]. + * Returns: SCHEDULE_OCCURRED - schedule occurred while the function worked + * CARRY_ON - schedule didn't occur while the function worked */ static int get_parents(struct tree_balance *tb, int h) { @@ -1088,8 +1180,11 @@ static int get_parents(struct tree_balance *tb, int h) /* Current node is the root of the tree or will be root of the tree */ if (path_offset <= FIRST_PATH_ELEMENT_OFFSET) { - /* The root can not have parents. - Release nodes which previously were obtained as parents of the current node neighbors. */ + /* + * The root can not have parents. + * Release nodes which previously were obtained as + * parents of the current node neighbors. + */ brelse(tb->FL[h]); brelse(tb->CFL[h]); brelse(tb->FR[h]); @@ -1111,10 +1206,14 @@ static int get_parents(struct tree_balance *tb, int h) get_bh(curf); tb->lkey[h] = position - 1; } else { - /* Calculate current parent of L[path_offset], which is the left neighbor of the current node. - Calculate current common parent of L[path_offset] and the current node. Note that - CFL[path_offset] not equal FL[path_offset] and CFL[path_offset] not equal F[path_offset]. - Calculate lkey[path_offset]. */ + /* + * Calculate current parent of L[path_offset], which is the + * left neighbor of the current node. Calculate current + * common parent of L[path_offset] and the current node. + * Note that CFL[path_offset] not equal FL[path_offset] and + * CFL[path_offset] not equal F[path_offset]. + * Calculate lkey[path_offset]. + */ if ((ret = get_far_parent(tb, h + 1, &curf, &curcf, LEFT_PARENTS)) != CARRY_ON) @@ -1130,19 +1229,22 @@ static int get_parents(struct tree_balance *tb, int h) (curcf && !B_IS_IN_TREE(curcf)), "PAP-8195: FL (%b) or CFL (%b) is invalid", curf, curcf); -/* Get parent FR[h] of R[h]. */ + /* Get parent FR[h] of R[h]. */ -/* Current node is the last child of F[h]. FR[h] != F[h]. */ + /* Current node is the last child of F[h]. FR[h] != F[h]. */ if (position == B_NR_ITEMS(PATH_H_PBUFFER(path, h + 1))) { -/* Calculate current parent of R[h], which is the right neighbor of F[h]. - Calculate current common parent of R[h] and current node. Note that CFR[h] - not equal FR[path_offset] and CFR[h] not equal F[h]. */ + /* + * Calculate current parent of R[h], which is the right + * neighbor of F[h]. Calculate current common parent of + * R[h] and current node. Note that CFR[h] not equal + * FR[path_offset] and CFR[h] not equal F[h]. + */ if ((ret = get_far_parent(tb, h + 1, &curf, &curcf, RIGHT_PARENTS)) != CARRY_ON) return ret; } else { -/* Current node is not the last child of its parent F[h]. */ + /* Current node is not the last child of its parent F[h]. */ curf = PATH_OFFSET_PBUFFER(path, path_offset - 1); curcf = PATH_OFFSET_PBUFFER(path, path_offset - 1); get_bh(curf); @@ -1165,8 +1267,10 @@ static int get_parents(struct tree_balance *tb, int h) return CARRY_ON; } -/* it is possible to remove node as result of shiftings to - neighbors even when we insert or paste item. */ +/* + * it is possible to remove node as result of shiftings to + * neighbors even when we insert or paste item. + */ static inline int can_node_be_removed(int mode, int lfree, int sfree, int rfree, struct tree_balance *tb, int h) { @@ -1189,7 +1293,8 @@ static inline int can_node_be_removed(int mode, int lfree, int sfree, int rfree, && op_is_left_mergeable(r_key, Sh->b_size)) ? IH_SIZE : 0) + ((h) ? KEY_SIZE : 0)) { /* node can not be removed */ - if (sfree >= levbytes) { /* new item fits into node S[h] without any shifting */ + if (sfree >= levbytes) { + /* new item fits into node S[h] without any shifting */ if (!h) tb->s0num = B_NR_ITEMS(Sh) + @@ -1202,7 +1307,8 @@ static inline int can_node_be_removed(int mode, int lfree, int sfree, int rfree, return !NO_BALANCING_NEEDED; } -/* Check whether current node S[h] is balanced when increasing its size by +/* + * Check whether current node S[h] is balanced when increasing its size by * Inserting or Pasting. * Calculate parameters for balancing for current level h. * Parameters: @@ -1219,39 +1325,48 @@ static inline int can_node_be_removed(int mode, int lfree, int sfree, int rfree, static int ip_check_balance(struct tree_balance *tb, int h) { struct virtual_node *vn = tb->tb_vn; - int levbytes, /* Number of bytes that must be inserted into (value - is negative if bytes are deleted) buffer which - contains node being balanced. The mnemonic is - that the attempted change in node space used level - is levbytes bytes. */ - ret; + /* + * Number of bytes that must be inserted into (value is negative + * if bytes are deleted) buffer which contains node being balanced. + * The mnemonic is that the attempted change in node space used + * level is levbytes bytes. + */ + int levbytes; + int ret; int lfree, sfree, rfree /* free space in L, S and R */ ; - /* nver is short for number of vertixes, and lnver is the number if - we shift to the left, rnver is the number if we shift to the - right, and lrnver is the number if we shift in both directions. - The goal is to minimize first the number of vertixes, and second, - the number of vertixes whose contents are changed by shifting, - and third the number of uncached vertixes whose contents are - changed by shifting and must be read from disk. */ + /* + * nver is short for number of vertixes, and lnver is the number if + * we shift to the left, rnver is the number if we shift to the + * right, and lrnver is the number if we shift in both directions. + * The goal is to minimize first the number of vertixes, and second, + * the number of vertixes whose contents are changed by shifting, + * and third the number of uncached vertixes whose contents are + * changed by shifting and must be read from disk. + */ int nver, lnver, rnver, lrnver; - /* used at leaf level only, S0 = S[0] is the node being balanced, - sInum [ I = 0,1,2 ] is the number of items that will - remain in node SI after balancing. S1 and S2 are new - nodes that might be created. */ + /* + * used at leaf level only, S0 = S[0] is the node being balanced, + * sInum [ I = 0,1,2 ] is the number of items that will + * remain in node SI after balancing. S1 and S2 are new + * nodes that might be created. + */ - /* we perform 8 calls to get_num_ver(). For each call we calculate five parameters. - where 4th parameter is s1bytes and 5th - s2bytes + /* + * we perform 8 calls to get_num_ver(). For each call we + * calculate five parameters. where 4th parameter is s1bytes + * and 5th - s2bytes + * + * s0num, s1num, s2num for 8 cases + * 0,1 - do not shift and do not shift but bottle + * 2 - shift only whole item to left + * 3 - shift to left and bottle as much as possible + * 4,5 - shift to right (whole items and as much as possible + * 6,7 - shift to both directions (whole items and as much as possible) */ - short snum012[40] = { 0, }; /* s0num, s1num, s2num for 8 cases - 0,1 - do not shift and do not shift but bottle - 2 - shift only whole item to left - 3 - shift to left and bottle as much as possible - 4,5 - shift to right (whole items and as much as possible - 6,7 - shift to both directions (whole items and as much as possible) - */ + short snum012[40] = { 0, }; /* Sh is the node whose balance is currently being checked */ struct buffer_head *Sh; @@ -1265,9 +1380,10 @@ static int ip_check_balance(struct tree_balance *tb, int h) reiserfs_panic(tb->tb_sb, "vs-8210", "S[0] can not be 0"); switch (ret = get_empty_nodes(tb, h)) { + /* no balancing for higher levels needed */ case CARRY_ON: set_parameters(tb, h, 0, 0, 1, NULL, -1, -1); - return NO_BALANCING_NEEDED; /* no balancing for higher levels needed */ + return NO_BALANCING_NEEDED; case NO_DISK_SPACE: case REPEAT_SEARCH: @@ -1278,7 +1394,9 @@ static int ip_check_balance(struct tree_balance *tb, int h) } } - if ((ret = get_parents(tb, h)) != CARRY_ON) /* get parents of S[h] neighbors. */ + /* get parents of S[h] neighbors. */ + ret = get_parents(tb, h); + if (ret != CARRY_ON) return ret; sfree = B_FREE_SPACE(Sh); @@ -1287,38 +1405,44 @@ static int ip_check_balance(struct tree_balance *tb, int h) rfree = get_rfree(tb, h); lfree = get_lfree(tb, h); + /* and new item fits into node S[h] without any shifting */ if (can_node_be_removed(vn->vn_mode, lfree, sfree, rfree, tb, h) == NO_BALANCING_NEEDED) - /* and new item fits into node S[h] without any shifting */ return NO_BALANCING_NEEDED; create_virtual_node(tb, h); /* - determine maximal number of items we can shift to the left neighbor (in tb structure) - and the maximal number of bytes that can flow to the left neighbor - from the left most liquid item that cannot be shifted from S[0] entirely (returned value) + * determine maximal number of items we can shift to the left + * neighbor (in tb structure) and the maximal number of bytes + * that can flow to the left neighbor from the left most liquid + * item that cannot be shifted from S[0] entirely (returned value) */ check_left(tb, h, lfree); /* - determine maximal number of items we can shift to the right neighbor (in tb structure) - and the maximal number of bytes that can flow to the right neighbor - from the right most liquid item that cannot be shifted from S[0] entirely (returned value) + * determine maximal number of items we can shift to the right + * neighbor (in tb structure) and the maximal number of bytes + * that can flow to the right neighbor from the right most liquid + * item that cannot be shifted from S[0] entirely (returned value) */ check_right(tb, h, rfree); - /* all contents of internal node S[h] can be moved into its - neighbors, S[h] will be removed after balancing */ + /* + * all contents of internal node S[h] can be moved into its + * neighbors, S[h] will be removed after balancing + */ if (h && (tb->rnum[h] + tb->lnum[h] >= vn->vn_nr_item + 1)) { int to_r; - /* Since we are working on internal nodes, and our internal - nodes have fixed size entries, then we can balance by the - number of items rather than the space they consume. In this - routine we set the left node equal to the right node, - allowing a difference of less than or equal to 1 child - pointer. */ + /* + * Since we are working on internal nodes, and our internal + * nodes have fixed size entries, then we can balance by the + * number of items rather than the space they consume. In this + * routine we set the left node equal to the right node, + * allowing a difference of less than or equal to 1 child + * pointer. + */ to_r = ((MAX_NR_KEY(Sh) << 1) + 2 - tb->lnum[h] - tb->rnum[h] + vn->vn_nr_item + 1) / 2 - (MAX_NR_KEY(Sh) + 1 - @@ -1328,7 +1452,10 @@ static int ip_check_balance(struct tree_balance *tb, int h) return CARRY_ON; } - /* this checks balance condition, that any two neighboring nodes can not fit in one node */ + /* + * this checks balance condition, that any two neighboring nodes + * can not fit in one node + */ RFALSE(h && (tb->lnum[h] >= vn->vn_nr_item + 1 || tb->rnum[h] >= vn->vn_nr_item + 1), @@ -1337,16 +1464,22 @@ static int ip_check_balance(struct tree_balance *tb, int h) (tb->rnum[h] >= vn->vn_nr_item && (tb->rbytes == -1))), "vs-8225: tree is not balanced on leaf level"); - /* all contents of S[0] can be moved into its neighbors - S[0] will be removed after balancing. */ + /* + * all contents of S[0] can be moved into its neighbors + * S[0] will be removed after balancing. + */ if (!h && is_leaf_removable(tb)) return CARRY_ON; - /* why do we perform this check here rather than earlier?? - Answer: we can win 1 node in some cases above. Moreover we - checked it above, when we checked, that S[0] is not removable - in principle */ - if (sfree >= levbytes) { /* new item fits into node S[h] without any shifting */ + /* + * why do we perform this check here rather than earlier?? + * Answer: we can win 1 node in some cases above. Moreover we + * checked it above, when we checked, that S[0] is not removable + * in principle + */ + + /* new item fits into node S[h] without any shifting */ + if (sfree >= levbytes) { if (!h) tb->s0num = vn->vn_nr_item; set_parameters(tb, h, 0, 0, 1, NULL, -1, -1); @@ -1355,18 +1488,19 @@ static int ip_check_balance(struct tree_balance *tb, int h) { int lpar, rpar, nset, lset, rset, lrset; - /* - * regular overflowing of the node - */ + /* regular overflowing of the node */ - /* get_num_ver works in 2 modes (FLOW & NO_FLOW) - lpar, rpar - number of items we can shift to left/right neighbor (including splitting item) - nset, lset, rset, lrset - shows, whether flowing items give better packing + /* + * get_num_ver works in 2 modes (FLOW & NO_FLOW) + * lpar, rpar - number of items we can shift to left/right + * neighbor (including splitting item) + * nset, lset, rset, lrset - shows, whether flowing items + * give better packing */ #define FLOW 1 #define NO_FLOW 0 /* do not any splitting */ - /* we choose one the following */ + /* we choose one of the following */ #define NOTHING_SHIFT_NO_FLOW 0 #define NOTHING_SHIFT_FLOW 5 #define LEFT_SHIFT_NO_FLOW 10 @@ -1379,10 +1513,13 @@ static int ip_check_balance(struct tree_balance *tb, int h) lpar = tb->lnum[h]; rpar = tb->rnum[h]; - /* calculate number of blocks S[h] must be split into when - nothing is shifted to the neighbors, - as well as number of items in each part of the split node (s012 numbers), - and number of bytes (s1bytes) of the shared drop which flow to S1 if any */ + /* + * calculate number of blocks S[h] must be split into when + * nothing is shifted to the neighbors, as well as number of + * items in each part of the split node (s012 numbers), + * and number of bytes (s1bytes) of the shared drop which + * flow to S1 if any + */ nset = NOTHING_SHIFT_NO_FLOW; nver = get_num_ver(vn->vn_mode, tb, h, 0, -1, h ? vn->vn_nr_item : 0, -1, @@ -1391,7 +1528,10 @@ static int ip_check_balance(struct tree_balance *tb, int h) if (!h) { int nver1; - /* note, that in this case we try to bottle between S[0] and S1 (S1 - the first new node) */ + /* + * note, that in this case we try to bottle + * between S[0] and S1 (S1 - the first new node) + */ nver1 = get_num_ver(vn->vn_mode, tb, h, 0, -1, 0, -1, snum012 + NOTHING_SHIFT_FLOW, FLOW); @@ -1399,11 +1539,13 @@ static int ip_check_balance(struct tree_balance *tb, int h) nset = NOTHING_SHIFT_FLOW, nver = nver1; } - /* calculate number of blocks S[h] must be split into when - l_shift_num first items and l_shift_bytes of the right most - liquid item to be shifted are shifted to the left neighbor, - as well as number of items in each part of the splitted node (s012 numbers), - and number of bytes (s1bytes) of the shared drop which flow to S1 if any + /* + * calculate number of blocks S[h] must be split into when + * l_shift_num first items and l_shift_bytes of the right + * most liquid item to be shifted are shifted to the left + * neighbor, as well as number of items in each part of the + * splitted node (s012 numbers), and number of bytes + * (s1bytes) of the shared drop which flow to S1 if any */ lset = LEFT_SHIFT_NO_FLOW; lnver = get_num_ver(vn->vn_mode, tb, h, @@ -1422,11 +1564,13 @@ static int ip_check_balance(struct tree_balance *tb, int h) lset = LEFT_SHIFT_FLOW, lnver = lnver1; } - /* calculate number of blocks S[h] must be split into when - r_shift_num first items and r_shift_bytes of the left most - liquid item to be shifted are shifted to the right neighbor, - as well as number of items in each part of the splitted node (s012 numbers), - and number of bytes (s1bytes) of the shared drop which flow to S1 if any + /* + * calculate number of blocks S[h] must be split into when + * r_shift_num first items and r_shift_bytes of the left most + * liquid item to be shifted are shifted to the right neighbor, + * as well as number of items in each part of the splitted + * node (s012 numbers), and number of bytes (s1bytes) of the + * shared drop which flow to S1 if any */ rset = RIGHT_SHIFT_NO_FLOW; rnver = get_num_ver(vn->vn_mode, tb, h, @@ -1451,10 +1595,12 @@ static int ip_check_balance(struct tree_balance *tb, int h) rset = RIGHT_SHIFT_FLOW, rnver = rnver1; } - /* calculate number of blocks S[h] must be split into when - items are shifted in both directions, - as well as number of items in each part of the splitted node (s012 numbers), - and number of bytes (s1bytes) of the shared drop which flow to S1 if any + /* + * calculate number of blocks S[h] must be split into when + * items are shifted in both directions, as well as number + * of items in each part of the splitted node (s012 numbers), + * and number of bytes (s1bytes) of the shared drop which + * flow to S1 if any */ lrset = LR_SHIFT_NO_FLOW; lrnver = get_num_ver(vn->vn_mode, tb, h, @@ -1481,10 +1627,12 @@ static int ip_check_balance(struct tree_balance *tb, int h) lrset = LR_SHIFT_FLOW, lrnver = lrnver1; } - /* Our general shifting strategy is: - 1) to minimized number of new nodes; - 2) to minimized number of neighbors involved in shifting; - 3) to minimized number of disk reads; */ + /* + * Our general shifting strategy is: + * 1) to minimized number of new nodes; + * 2) to minimized number of neighbors involved in shifting; + * 3) to minimized number of disk reads; + */ /* we can win TWO or ONE nodes by shifting in both directions */ if (lrnver < lnver && lrnver < rnver) { @@ -1508,42 +1656,59 @@ static int ip_check_balance(struct tree_balance *tb, int h) return CARRY_ON; } - /* if shifting doesn't lead to better packing then don't shift */ + /* + * if shifting doesn't lead to better packing + * then don't shift + */ if (nver == lrnver) { set_parameters(tb, h, 0, 0, nver, snum012 + nset, -1, -1); return CARRY_ON; } - /* now we know that for better packing shifting in only one - direction either to the left or to the right is required */ + /* + * now we know that for better packing shifting in only one + * direction either to the left or to the right is required + */ - /* if shifting to the left is better than shifting to the right */ + /* + * if shifting to the left is better than + * shifting to the right + */ if (lnver < rnver) { SET_PAR_SHIFT_LEFT; return CARRY_ON; } - /* if shifting to the right is better than shifting to the left */ + /* + * if shifting to the right is better than + * shifting to the left + */ if (lnver > rnver) { SET_PAR_SHIFT_RIGHT; return CARRY_ON; } - /* now shifting in either direction gives the same number - of nodes and we can make use of the cached neighbors */ + /* + * now shifting in either direction gives the same number + * of nodes and we can make use of the cached neighbors + */ if (is_left_neighbor_in_cache(tb, h)) { SET_PAR_SHIFT_LEFT; return CARRY_ON; } - /* shift to the right independently on whether the right neighbor in cache or not */ + /* + * shift to the right independently on whether the + * right neighbor in cache or not + */ SET_PAR_SHIFT_RIGHT; return CARRY_ON; } } -/* Check whether current node S[h] is balanced when Decreasing its size by +/* + * Check whether current node S[h] is balanced when Decreasing its size by * Deleting or Cutting for INTERNAL node of S+tree. * Calculate parameters for balancing for current level h. * Parameters: @@ -1563,8 +1728,10 @@ static int dc_check_balance_internal(struct tree_balance *tb, int h) { struct virtual_node *vn = tb->tb_vn; - /* Sh is the node whose balance is currently being checked, - and Fh is its father. */ + /* + * Sh is the node whose balance is currently being checked, + * and Fh is its father. + */ struct buffer_head *Sh, *Fh; int maxsize, ret; int lfree, rfree /* free space in L and R */ ; @@ -1574,19 +1741,25 @@ static int dc_check_balance_internal(struct tree_balance *tb, int h) maxsize = MAX_CHILD_SIZE(Sh); -/* using tb->insert_size[h], which is negative in this case, create_virtual_node calculates: */ -/* new_nr_item = number of items node would have if operation is */ -/* performed without balancing (new_nr_item); */ + /* + * using tb->insert_size[h], which is negative in this case, + * create_virtual_node calculates: + * new_nr_item = number of items node would have if operation is + * performed without balancing (new_nr_item); + */ create_virtual_node(tb, h); if (!Fh) { /* S[h] is the root. */ + /* no balancing for higher levels needed */ if (vn->vn_nr_item > 0) { set_parameters(tb, h, 0, 0, 1, NULL, -1, -1); - return NO_BALANCING_NEEDED; /* no balancing for higher levels needed */ + return NO_BALANCING_NEEDED; } - /* new_nr_item == 0. + /* + * new_nr_item == 0. * Current root will be deleted resulting in - * decrementing the tree height. */ + * decrementing the tree height. + */ set_parameters(tb, h, 0, 0, 0, NULL, -1, -1); return CARRY_ON; } @@ -1602,12 +1775,18 @@ static int dc_check_balance_internal(struct tree_balance *tb, int h) check_left(tb, h, lfree); check_right(tb, h, rfree); - if (vn->vn_nr_item >= MIN_NR_KEY(Sh)) { /* Balance condition for the internal node is valid. - * In this case we balance only if it leads to better packing. */ - if (vn->vn_nr_item == MIN_NR_KEY(Sh)) { /* Here we join S[h] with one of its neighbors, - * which is impossible with greater values of new_nr_item. */ + /* + * Balance condition for the internal node is valid. + * In this case we balance only if it leads to better packing. + */ + if (vn->vn_nr_item >= MIN_NR_KEY(Sh)) { + /* + * Here we join S[h] with one of its neighbors, + * which is impossible with greater values of new_nr_item. + */ + if (vn->vn_nr_item == MIN_NR_KEY(Sh)) { + /* All contents of S[h] can be moved to L[h]. */ if (tb->lnum[h] >= vn->vn_nr_item + 1) { - /* All contents of S[h] can be moved to L[h]. */ int n; int order_L; @@ -1623,8 +1802,8 @@ static int dc_check_balance_internal(struct tree_balance *tb, int h) return CARRY_ON; } + /* All contents of S[h] can be moved to R[h]. */ if (tb->rnum[h] >= vn->vn_nr_item + 1) { - /* All contents of S[h] can be moved to R[h]. */ int n; int order_R; @@ -1641,8 +1820,11 @@ static int dc_check_balance_internal(struct tree_balance *tb, int h) } } + /* + * All contents of S[h] can be moved to the neighbors + * (L[h] & R[h]). + */ if (tb->rnum[h] + tb->lnum[h] >= vn->vn_nr_item + 1) { - /* All contents of S[h] can be moved to the neighbors (L[h] & R[h]). */ int to_r; to_r = @@ -1659,7 +1841,10 @@ static int dc_check_balance_internal(struct tree_balance *tb, int h) return NO_BALANCING_NEEDED; } - /* Current node contain insufficient number of items. Balancing is required. */ + /* + * Current node contain insufficient number of items. + * Balancing is required. + */ /* Check whether we can merge S[h] with left neighbor. */ if (tb->lnum[h] >= vn->vn_nr_item + 1) if (is_left_neighbor_in_cache(tb, h) @@ -1726,7 +1911,8 @@ static int dc_check_balance_internal(struct tree_balance *tb, int h) return CARRY_ON; } -/* Check whether current node S[h] is balanced when Decreasing its size by +/* + * Check whether current node S[h] is balanced when Decreasing its size by * Deleting or Truncating for LEAF node of S+tree. * Calculate parameters for balancing for current level h. * Parameters: @@ -1743,15 +1929,21 @@ static int dc_check_balance_leaf(struct tree_balance *tb, int h) { struct virtual_node *vn = tb->tb_vn; - /* Number of bytes that must be deleted from - (value is negative if bytes are deleted) buffer which - contains node being balanced. The mnemonic is that the - attempted change in node space used level is levbytes bytes. */ + /* + * Number of bytes that must be deleted from + * (value is negative if bytes are deleted) buffer which + * contains node being balanced. The mnemonic is that the + * attempted change in node space used level is levbytes bytes. + */ int levbytes; + /* the maximal item size */ int maxsize, ret; - /* S0 is the node whose balance is currently being checked, - and F0 is its father. */ + + /* + * S0 is the node whose balance is currently being checked, + * and F0 is its father. + */ struct buffer_head *S0, *F0; int lfree, rfree /* free space in L and R */ ; @@ -1784,9 +1976,11 @@ static int dc_check_balance_leaf(struct tree_balance *tb, int h) if (are_leaves_removable(tb, lfree, rfree)) return CARRY_ON; - /* determine maximal number of items we can shift to the left/right neighbor - and the maximal number of bytes that can flow to the left/right neighbor - from the left/right most liquid item that cannot be shifted from S[0] entirely + /* + * determine maximal number of items we can shift to the left/right + * neighbor and the maximal number of bytes that can flow to the + * left/right neighbor from the left/right most liquid item that + * cannot be shifted from S[0] entirely */ check_left(tb, h, lfree); check_right(tb, h, rfree); @@ -1810,7 +2004,10 @@ static int dc_check_balance_leaf(struct tree_balance *tb, int h) return CARRY_ON; } - /* All contents of S[0] can be moved to the neighbors (L[0] & R[0]). Set parameters and return */ + /* + * All contents of S[0] can be moved to the neighbors (L[0] & R[0]). + * Set parameters and return + */ if (is_leaf_removable(tb)) return CARRY_ON; @@ -1820,7 +2017,8 @@ static int dc_check_balance_leaf(struct tree_balance *tb, int h) return NO_BALANCING_NEEDED; } -/* Check whether current node S[h] is balanced when Decreasing its size by +/* + * Check whether current node S[h] is balanced when Decreasing its size by * Deleting or Cutting. * Calculate parameters for balancing for current level h. * Parameters: @@ -1844,15 +2042,16 @@ static int dc_check_balance(struct tree_balance *tb, int h) return dc_check_balance_leaf(tb, h); } -/* Check whether current node S[h] is balanced. +/* + * Check whether current node S[h] is balanced. * Calculate parameters for balancing for current level h. * Parameters: * * tb tree_balance structure: * - * tb is a large structure that must be read about in the header file - * at the same time as this procedure if the reader is to successfully - * understand this procedure + * tb is a large structure that must be read about in the header + * file at the same time as this procedure if the reader is + * to successfully understand this procedure * * h current level of the node; * inum item number in S[h]; @@ -1882,8 +2081,8 @@ static int check_balance(int mode, RFALSE(mode == M_INSERT && !vn->vn_ins_ih, "vs-8255: ins_ih can not be 0 in insert mode"); + /* Calculate balance parameters when size of node is increasing. */ if (tb->insert_size[h] > 0) - /* Calculate balance parameters when size of node is increasing. */ return ip_check_balance(tb, h); /* Calculate balance parameters when size of node is decreasing. */ @@ -1911,21 +2110,23 @@ static int get_direct_parent(struct tree_balance *tb, int h) PATH_OFFSET_POSITION(path, path_offset - 1) = 0; return CARRY_ON; } - return REPEAT_SEARCH; /* Root is changed and we must recalculate the path. */ + /* Root is changed and we must recalculate the path. */ + return REPEAT_SEARCH; } + /* Parent in the path is not in the tree. */ if (!B_IS_IN_TREE (bh = PATH_OFFSET_PBUFFER(path, path_offset - 1))) - return REPEAT_SEARCH; /* Parent in the path is not in the tree. */ + return REPEAT_SEARCH; if ((position = PATH_OFFSET_POSITION(path, path_offset - 1)) > B_NR_ITEMS(bh)) return REPEAT_SEARCH; + /* Parent in the path is not parent of the current node in the tree. */ if (B_N_CHILD_NUM(bh, position) != PATH_OFFSET_PBUFFER(path, path_offset)->b_blocknr) - /* Parent in the path is not parent of the current node in the tree. */ return REPEAT_SEARCH; if (buffer_locked(bh)) { @@ -1936,10 +2137,15 @@ static int get_direct_parent(struct tree_balance *tb, int h) return REPEAT_SEARCH; } - return CARRY_ON; /* Parent in the path is unlocked and really parent of the current node. */ + /* + * Parent in the path is unlocked and really parent + * of the current node. + */ + return CARRY_ON; } -/* Using lnum[h] and rnum[h] we should determine what neighbors +/* + * Using lnum[h] and rnum[h] we should determine what neighbors * of S[h] we * need in order to balance S[h], and get them if necessary. * Returns: SCHEDULE_OCCURRED - schedule occurred while the function worked; @@ -1997,7 +2203,7 @@ static int get_neighbors(struct tree_balance *tb, int h) } /* We need right neighbor to balance S[path_offset]. */ - if (tb->rnum[h]) { /* We need right neighbor to balance S[path_offset]. */ + if (tb->rnum[h]) { PROC_INFO_INC(sb, need_r_neighbor[h]); bh = PATH_OFFSET_PBUFFER(tb->tb_path, path_offset); @@ -2053,9 +2259,11 @@ static int get_virtual_node_size(struct super_block *sb, struct buffer_head *bh) (max_num_of_entries - 1) * sizeof(__u16)); } -/* maybe we should fail balancing we are going to perform when kmalloc - fails several times. But now it will loop until kmalloc gets - required memory */ +/* + * maybe we should fail balancing we are going to perform when kmalloc + * fails several times. But now it will loop until kmalloc gets + * required memory + */ static int get_mem_for_virtual_node(struct tree_balance *tb) { int check_fs = 0; @@ -2064,8 +2272,8 @@ static int get_mem_for_virtual_node(struct tree_balance *tb) size = get_virtual_node_size(tb->tb_sb, PATH_PLAST_BUFFER(tb->tb_path)); + /* we have to allocate more memory for virtual node */ if (size > tb->vn_buf_size) { - /* we have to allocate more memory for virtual node */ if (tb->vn_buf) { /* free memory allocated before */ kfree(tb->vn_buf); @@ -2079,10 +2287,12 @@ static int get_mem_for_virtual_node(struct tree_balance *tb) /* get memory for virtual item */ buf = kmalloc(size, GFP_ATOMIC | __GFP_NOWARN); if (!buf) { - /* getting memory with GFP_KERNEL priority may involve - balancing now (due to indirect_to_direct conversion on - dcache shrinking). So, release path and collected - resources here */ + /* + * getting memory with GFP_KERNEL priority may involve + * balancing now (due to indirect_to_direct conversion + * on dcache shrinking). So, release path and collected + * resources here + */ free_buffers_in_tb(tb); buf = kmalloc(size, GFP_NOFS); if (!buf) { @@ -2168,8 +2378,10 @@ static int wait_tb_buffers_until_unlocked(struct tree_balance *tb) for (i = tb->tb_path->path_length; !locked && i > ILLEGAL_PATH_ELEMENT_OFFSET; i--) { if (PATH_OFFSET_PBUFFER(tb->tb_path, i)) { - /* if I understand correctly, we can only be sure the last buffer - ** in the path is in the tree --clm + /* + * if I understand correctly, we can only + * be sure the last buffer in the path is + * in the tree --clm */ #ifdef CONFIG_REISERFS_CHECK if (PATH_PLAST_BUFFER(tb->tb_path) == @@ -2256,13 +2468,15 @@ static int wait_tb_buffers_until_unlocked(struct tree_balance *tb) } } } - /* as far as I can tell, this is not required. The FEB list seems - ** to be full of newly allocated nodes, which will never be locked, - ** dirty, or anything else. - ** To be safe, I'm putting in the checks and waits in. For the moment, - ** they are needed to keep the code in journal.c from complaining - ** about the buffer. That code is inside CONFIG_REISERFS_CHECK as well. - ** --clm + + /* + * as far as I can tell, this is not required. The FEB list + * seems to be full of newly allocated nodes, which will + * never be locked, dirty, or anything else. + * To be safe, I'm putting in the checks and waits in. + * For the moment, they are needed to keep the code in + * journal.c from complaining about the buffer. + * That code is inside CONFIG_REISERFS_CHECK as well. --clm */ for (i = 0; !locked && i < MAX_FEB_SIZE; i++) { if (tb->FEB[i]) { @@ -2300,7 +2514,8 @@ static int wait_tb_buffers_until_unlocked(struct tree_balance *tb) return CARRY_ON; } -/* Prepare for balancing, that is +/* + * Prepare for balancing, that is * get all necessary parents, and neighbors; * analyze what and where should be moved; * get sufficient number of new nodes; @@ -2309,13 +2524,14 @@ static int wait_tb_buffers_until_unlocked(struct tree_balance *tb) * When ported to SMP kernels, only at the last moment after all needed nodes * are collected in cache, will the resources be locked using the usual * textbook ordered lock acquisition algorithms. Note that ensuring that - * this code neither write locks what it does not need to write lock nor locks out of order - * will be a pain in the butt that could have been avoided. Grumble grumble. -Hans + * this code neither write locks what it does not need to write lock nor locks + * out of order will be a pain in the butt that could have been avoided. + * Grumble grumble. -Hans * * fix is meant in the sense of render unchanging * - * Latency might be improved by first gathering a list of what buffers are needed - * and then getting as many of them in parallel as possible? -Hans + * Latency might be improved by first gathering a list of what buffers + * are needed and then getting as many of them in parallel as possible? -Hans * * Parameters: * op_mode i - insert, d - delete, c - cut (truncate), p - paste (append) @@ -2335,8 +2551,9 @@ int fix_nodes(int op_mode, struct tree_balance *tb, int ret, h, item_num = PATH_LAST_POSITION(tb->tb_path); int pos_in_item; - /* we set wait_tb_buffers_run when we have to restore any dirty bits cleared - ** during wait_tb_buffers_run + /* + * we set wait_tb_buffers_run when we have to restore any dirty + * bits cleared during wait_tb_buffers_run */ int wait_tb_buffers_run = 0; struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path); @@ -2347,10 +2564,11 @@ int fix_nodes(int op_mode, struct tree_balance *tb, tb->fs_gen = get_generation(tb->tb_sb); - /* we prepare and log the super here so it will already be in the - ** transaction when do_balance needs to change it. - ** This way do_balance won't have to schedule when trying to prepare - ** the super for logging + /* + * we prepare and log the super here so it will already be in the + * transaction when do_balance needs to change it. + * This way do_balance won't have to schedule when trying to prepare + * the super for logging */ reiserfs_prepare_for_journal(tb->tb_sb, SB_BUFFER_WITH_SB(tb->tb_sb), 1); @@ -2408,7 +2626,7 @@ int fix_nodes(int op_mode, struct tree_balance *tb, #endif if (get_mem_for_virtual_node(tb) == REPEAT_SEARCH) - // FIXME: maybe -ENOMEM when tb->vn_buf == 0? Now just repeat + /* FIXME: maybe -ENOMEM when tb->vn_buf == 0? Now just repeat */ return REPEAT_SEARCH; /* Starting from the leaf level; for all levels h of the tree. */ @@ -2427,7 +2645,10 @@ int fix_nodes(int op_mode, struct tree_balance *tb, goto repeat; if (h != MAX_HEIGHT - 1) tb->insert_size[h + 1] = 0; - /* ok, analysis and resource gathering are complete */ + /* + * ok, analysis and resource gathering + * are complete + */ break; } goto repeat; @@ -2437,15 +2658,19 @@ int fix_nodes(int op_mode, struct tree_balance *tb, if (ret != CARRY_ON) goto repeat; - /* No disk space, or schedule occurred and analysis may be - * invalid and needs to be redone. */ + /* + * No disk space, or schedule occurred and analysis may be + * invalid and needs to be redone. + */ ret = get_empty_nodes(tb, h); if (ret != CARRY_ON) goto repeat; + /* + * We have a positive insert size but no nodes exist on this + * level, this means that we are creating a new root. + */ if (!PATH_H_PBUFFER(tb->tb_path, h)) { - /* We have a positive insert size but no nodes exist on this - level, this means that we are creating a new root. */ RFALSE(tb->blknum[h] != 1, "PAP-8350: creating new empty root"); @@ -2453,11 +2678,13 @@ int fix_nodes(int op_mode, struct tree_balance *tb, if (h < MAX_HEIGHT - 1) tb->insert_size[h + 1] = 0; } else if (!PATH_H_PBUFFER(tb->tb_path, h + 1)) { + /* + * The tree needs to be grown, so this node S[h] + * which is the root node is split into two nodes, + * and a new node (S[h+1]) will be created to + * become the root node. + */ if (tb->blknum[h] > 1) { - /* The tree needs to be grown, so this node S[h] - which is the root node is split into two nodes, - and a new node (S[h+1]) will be created to - become the root node. */ RFALSE(h == MAX_HEIGHT - 1, "PAP-8355: attempt to create too high of a tree"); @@ -2488,11 +2715,13 @@ int fix_nodes(int op_mode, struct tree_balance *tb, } repeat: - // fix_nodes was unable to perform its calculation due to - // filesystem got changed under us, lack of free disk space or i/o - // failure. If the first is the case - the search will be - // repeated. For now - free all resources acquired so far except - // for the new allocated nodes + /* + * fix_nodes was unable to perform its calculation due to + * filesystem got changed under us, lack of free disk space or i/o + * failure. If the first is the case - the search will be + * repeated. For now - free all resources acquired so far except + * for the new allocated nodes + */ { int i; @@ -2548,8 +2777,6 @@ int fix_nodes(int op_mode, struct tree_balance *tb, } -/* Anatoly will probably forgive me renaming tb to tb. I just - wanted to make lines shorter */ void unfix_nodes(struct tree_balance *tb) { int i; @@ -2578,8 +2805,10 @@ void unfix_nodes(struct tree_balance *tb) for (i = 0; i < MAX_FEB_SIZE; i++) { if (tb->FEB[i]) { b_blocknr_t blocknr = tb->FEB[i]->b_blocknr; - /* de-allocated block which was not used by balancing and - bforget about buffer for it */ + /* + * de-allocated block which was not used by + * balancing and bforget about buffer for it + */ brelse(tb->FEB[i]); reiserfs_free_block(tb->transaction_handle, NULL, blocknr, 0); diff --git a/fs/reiserfs/hashes.c b/fs/reiserfs/hashes.c index 91b0cc1242a2..7a26c4fe6c46 100644 --- a/fs/reiserfs/hashes.c +++ b/fs/reiserfs/hashes.c @@ -12,12 +12,6 @@ * Yura's function is added (04/07/2000) */ -// -// keyed_hash -// yura_hash -// r5_hash -// - #include <linux/kernel.h> #include "reiserfs.h" #include <asm/types.h> @@ -56,7 +50,7 @@ u32 keyed_hash(const signed char *msg, int len) u32 pad; int i; - // assert(len >= 0 && len < 256); + /* assert(len >= 0 && len < 256); */ pad = (u32) len | ((u32) len << 8); pad |= pad << 16; @@ -127,9 +121,10 @@ u32 keyed_hash(const signed char *msg, int len) return h0 ^ h1; } -/* What follows in this file is copyright 2000 by Hans Reiser, and the - * licensing of what follows is governed by reiserfs/README */ - +/* + * What follows in this file is copyright 2000 by Hans Reiser, and the + * licensing of what follows is governed by reiserfs/README + */ u32 yura_hash(const signed char *msg, int len) { int j, pow; diff --git a/fs/reiserfs/ibalance.c b/fs/reiserfs/ibalance.c index ae26a271da35..c4a696714148 100644 --- a/fs/reiserfs/ibalance.c +++ b/fs/reiserfs/ibalance.c @@ -12,7 +12,10 @@ int balance_internal(struct tree_balance *, int, int, struct item_head *, struct buffer_head **); -/* modes of internal_shift_left, internal_shift_right and internal_insert_childs */ +/* + * modes of internal_shift_left, internal_shift_right and + * internal_insert_childs + */ #define INTERNAL_SHIFT_FROM_S_TO_L 0 #define INTERNAL_SHIFT_FROM_R_TO_S 1 #define INTERNAL_SHIFT_FROM_L_TO_S 2 @@ -32,7 +35,9 @@ static void internal_define_dest_src_infos(int shift_mode, memset(src_bi, 0, sizeof(struct buffer_info)); /* define dest, src, dest parent, dest position */ switch (shift_mode) { - case INTERNAL_SHIFT_FROM_S_TO_L: /* used in internal_shift_left */ + + /* used in internal_shift_left */ + case INTERNAL_SHIFT_FROM_S_TO_L: src_bi->tb = tb; src_bi->bi_bh = PATH_H_PBUFFER(tb->tb_path, h); src_bi->bi_parent = PATH_H_PPARENT(tb->tb_path, h); @@ -52,12 +57,14 @@ static void internal_define_dest_src_infos(int shift_mode, dest_bi->tb = tb; dest_bi->bi_bh = PATH_H_PBUFFER(tb->tb_path, h); dest_bi->bi_parent = PATH_H_PPARENT(tb->tb_path, h); - dest_bi->bi_position = PATH_H_POSITION(tb->tb_path, h + 1); /* dest position is analog of dest->b_item_order */ + /* dest position is analog of dest->b_item_order */ + dest_bi->bi_position = PATH_H_POSITION(tb->tb_path, h + 1); *d_key = tb->lkey[h]; *cf = tb->CFL[h]; break; - case INTERNAL_SHIFT_FROM_R_TO_S: /* used in internal_shift_left */ + /* used in internal_shift_left */ + case INTERNAL_SHIFT_FROM_R_TO_S: src_bi->tb = tb; src_bi->bi_bh = tb->R[h]; src_bi->bi_parent = tb->FR[h]; @@ -111,7 +118,8 @@ static void internal_define_dest_src_infos(int shift_mode, } } -/* Insert count node pointers into buffer cur before position to + 1. +/* + * Insert count node pointers into buffer cur before position to + 1. * Insert count items into buffer cur before position to. * Items and node pointers are specified by inserted and bh respectively. */ @@ -190,8 +198,10 @@ static void internal_insert_childs(struct buffer_info *cur_bi, } -/* Delete del_num items and node pointers from buffer cur starting from * - * the first_i'th item and first_p'th pointers respectively. */ +/* + * Delete del_num items and node pointers from buffer cur starting from + * the first_i'th item and first_p'th pointers respectively. + */ static void internal_delete_pointers_items(struct buffer_info *cur_bi, int first_p, int first_i, int del_num) @@ -270,22 +280,30 @@ static void internal_delete_childs(struct buffer_info *cur_bi, int from, int n) i_from = (from == 0) ? from : from - 1; - /* delete n pointers starting from `from' position in CUR; - delete n keys starting from 'i_from' position in CUR; + /* + * delete n pointers starting from `from' position in CUR; + * delete n keys starting from 'i_from' position in CUR; */ internal_delete_pointers_items(cur_bi, from, i_from, n); } -/* copy cpy_num node pointers and cpy_num - 1 items from buffer src to buffer dest -* last_first == FIRST_TO_LAST means, that we copy first items from src to tail of dest - * last_first == LAST_TO_FIRST means, that we copy last items from src to head of dest +/* + * copy cpy_num node pointers and cpy_num - 1 items from buffer src to buffer + * dest + * last_first == FIRST_TO_LAST means that we copy first items + * from src to tail of dest + * last_first == LAST_TO_FIRST means that we copy last items + * from src to head of dest */ static void internal_copy_pointers_items(struct buffer_info *dest_bi, struct buffer_head *src, int last_first, int cpy_num) { - /* ATTENTION! Number of node pointers in DEST is equal to number of items in DEST * - * as delimiting key have already inserted to buffer dest.*/ + /* + * ATTENTION! Number of node pointers in DEST is equal to number + * of items in DEST as delimiting key have already inserted to + * buffer dest. + */ struct buffer_head *dest = dest_bi->bi_bh; int nr_dest, nr_src; int dest_order, src_order; @@ -366,7 +384,9 @@ static void internal_copy_pointers_items(struct buffer_info *dest_bi, } -/* Copy cpy_num node pointers and cpy_num - 1 items from buffer src to buffer dest. +/* + * Copy cpy_num node pointers and cpy_num - 1 items from buffer src to + * buffer dest. * Delete cpy_num - del_par items and node pointers from buffer src. * last_first == FIRST_TO_LAST means, that we copy/delete first items from src. * last_first == LAST_TO_FIRST means, that we copy/delete last items from src. @@ -385,8 +405,10 @@ static void internal_move_pointers_items(struct buffer_info *dest_bi, if (last_first == FIRST_TO_LAST) { /* shift_left occurs */ first_pointer = 0; first_item = 0; - /* delete cpy_num - del_par pointers and keys starting for pointers with first_pointer, - for key - with first_item */ + /* + * delete cpy_num - del_par pointers and keys starting for + * pointers with first_pointer, for key - with first_item + */ internal_delete_pointers_items(src_bi, first_pointer, first_item, cpy_num - del_par); } else { /* shift_right occurs */ @@ -404,7 +426,9 @@ static void internal_move_pointers_items(struct buffer_info *dest_bi, } /* Insert n_src'th key of buffer src before n_dest'th key of buffer dest. */ -static void internal_insert_key(struct buffer_info *dest_bi, int dest_position_before, /* insert key before key with n_dest number */ +static void internal_insert_key(struct buffer_info *dest_bi, + /* insert key before key with n_dest number */ + int dest_position_before, struct buffer_head *src, int src_position) { struct buffer_head *dest = dest_bi->bi_bh; @@ -453,13 +477,19 @@ static void internal_insert_key(struct buffer_info *dest_bi, int dest_position_b } } -/* Insert d_key'th (delimiting) key from buffer cfl to tail of dest. - * Copy pointer_amount node pointers and pointer_amount - 1 items from buffer src to buffer dest. +/* + * Insert d_key'th (delimiting) key from buffer cfl to tail of dest. + * Copy pointer_amount node pointers and pointer_amount - 1 items from + * buffer src to buffer dest. * Replace d_key'th key in buffer cfl. * Delete pointer_amount items and node pointers from buffer src. */ /* this can be invoked both to shift from S to L and from R to S */ -static void internal_shift_left(int mode, /* INTERNAL_FROM_S_TO_L | INTERNAL_FROM_R_TO_S */ +static void internal_shift_left( + /* + * INTERNAL_FROM_S_TO_L | INTERNAL_FROM_R_TO_S + */ + int mode, struct tree_balance *tb, int h, int pointer_amount) { @@ -473,7 +503,10 @@ static void internal_shift_left(int mode, /* INTERNAL_FROM_S_TO_L | INTERNAL_FRO /*printk("pointer_amount = %d\n",pointer_amount); */ if (pointer_amount) { - /* insert delimiting key from common father of dest and src to node dest into position B_NR_ITEM(dest) */ + /* + * insert delimiting key from common father of dest and + * src to node dest into position B_NR_ITEM(dest) + */ internal_insert_key(&dest_bi, B_NR_ITEMS(dest_bi.bi_bh), cf, d_key_position); @@ -492,7 +525,8 @@ static void internal_shift_left(int mode, /* INTERNAL_FROM_S_TO_L | INTERNAL_FRO } -/* Insert delimiting key to L[h]. +/* + * Insert delimiting key to L[h]. * Copy n node pointers and n - 1 items from buffer S[h] to L[h]. * Delete n - 1 items and node pointers from buffer S[h]. */ @@ -507,23 +541,27 @@ static void internal_shift1_left(struct tree_balance *tb, internal_define_dest_src_infos(INTERNAL_SHIFT_FROM_S_TO_L, tb, h, &dest_bi, &src_bi, &d_key_position, &cf); - if (pointer_amount > 0) /* insert lkey[h]-th key from CFL[h] to left neighbor L[h] */ + /* insert lkey[h]-th key from CFL[h] to left neighbor L[h] */ + if (pointer_amount > 0) internal_insert_key(&dest_bi, B_NR_ITEMS(dest_bi.bi_bh), cf, d_key_position); - /* internal_insert_key (tb->L[h], B_NR_ITEM(tb->L[h]), tb->CFL[h], tb->lkey[h]); */ /* last parameter is del_parameter */ internal_move_pointers_items(&dest_bi, &src_bi, FIRST_TO_LAST, pointer_amount, 1); - /* internal_move_pointers_items (tb->L[h], tb->S[h], FIRST_TO_LAST, pointer_amount, 1); */ } -/* Insert d_key'th (delimiting) key from buffer cfr to head of dest. +/* + * Insert d_key'th (delimiting) key from buffer cfr to head of dest. * Copy n node pointers and n - 1 items from buffer src to buffer dest. * Replace d_key'th key in buffer cfr. * Delete n items and node pointers from buffer src. */ -static void internal_shift_right(int mode, /* INTERNAL_FROM_S_TO_R | INTERNAL_FROM_L_TO_S */ +static void internal_shift_right( + /* + * INTERNAL_FROM_S_TO_R | INTERNAL_FROM_L_TO_S + */ + int mode, struct tree_balance *tb, int h, int pointer_amount) { @@ -538,7 +576,10 @@ static void internal_shift_right(int mode, /* INTERNAL_FROM_S_TO_R | INTERNAL_FR nr = B_NR_ITEMS(src_bi.bi_bh); if (pointer_amount > 0) { - /* insert delimiting key from common father of dest and src to dest node into position 0 */ + /* + * insert delimiting key from common father of dest + * and src to dest node into position 0 + */ internal_insert_key(&dest_bi, 0, cf, d_key_position); if (nr == pointer_amount - 1) { RFALSE(src_bi.bi_bh != PATH_H_PBUFFER(tb->tb_path, h) /*tb->S[h] */ || @@ -559,7 +600,8 @@ static void internal_shift_right(int mode, /* INTERNAL_FROM_S_TO_R | INTERNAL_FR pointer_amount, 0); } -/* Insert delimiting key to R[h]. +/* + * Insert delimiting key to R[h]. * Copy n node pointers and n - 1 items from buffer S[h] to R[h]. * Delete n - 1 items and node pointers from buffer S[h]. */ @@ -574,18 +616,19 @@ static void internal_shift1_right(struct tree_balance *tb, internal_define_dest_src_infos(INTERNAL_SHIFT_FROM_S_TO_R, tb, h, &dest_bi, &src_bi, &d_key_position, &cf); - if (pointer_amount > 0) /* insert rkey from CFR[h] to right neighbor R[h] */ + /* insert rkey from CFR[h] to right neighbor R[h] */ + if (pointer_amount > 0) internal_insert_key(&dest_bi, 0, cf, d_key_position); - /* internal_insert_key (tb->R[h], 0, tb->CFR[h], tb->rkey[h]); */ /* last parameter is del_parameter */ internal_move_pointers_items(&dest_bi, &src_bi, LAST_TO_FIRST, pointer_amount, 1); - /* internal_move_pointers_items (tb->R[h], tb->S[h], LAST_TO_FIRST, pointer_amount, 1); */ } -/* Delete insert_num node pointers together with their left items - * and balance current node.*/ +/* + * Delete insert_num node pointers together with their left items + * and balance current node. + */ static void balance_internal_when_delete(struct tree_balance *tb, int h, int child_pos) { @@ -626,9 +669,11 @@ static void balance_internal_when_delete(struct tree_balance *tb, new_root = tb->R[h - 1]; else new_root = tb->L[h - 1]; - /* switch super block's tree root block number to the new value */ + /* + * switch super block's tree root block + * number to the new value */ PUT_SB_ROOT_BLOCK(tb->tb_sb, new_root->b_blocknr); - //REISERFS_SB(tb->tb_sb)->s_rs->s_tree_height --; + /*REISERFS_SB(tb->tb_sb)->s_rs->s_tree_height --; */ PUT_SB_TREE_HEIGHT(tb->tb_sb, SB_TREE_HEIGHT(tb->tb_sb) - 1); @@ -636,8 +681,8 @@ static void balance_internal_when_delete(struct tree_balance *tb, REISERFS_SB(tb->tb_sb)->s_sbh, 1); /*&&&&&&&&&&&&&&&&&&&&&& */ + /* use check_internal if new root is an internal node */ if (h > 1) - /* use check_internal if new root is an internal node */ check_internal(new_root); /*&&&&&&&&&&&&&&&&&&&&&& */ @@ -648,7 +693,8 @@ static void balance_internal_when_delete(struct tree_balance *tb, return; } - if (tb->L[h] && tb->lnum[h] == -B_NR_ITEMS(tb->L[h]) - 1) { /* join S[h] with L[h] */ + /* join S[h] with L[h] */ + if (tb->L[h] && tb->lnum[h] == -B_NR_ITEMS(tb->L[h]) - 1) { RFALSE(tb->rnum[h] != 0, "invalid tb->rnum[%d]==%d when joining S[h] with L[h]", @@ -660,7 +706,8 @@ static void balance_internal_when_delete(struct tree_balance *tb, return; } - if (tb->R[h] && tb->rnum[h] == -B_NR_ITEMS(tb->R[h]) - 1) { /* join S[h] with R[h] */ + /* join S[h] with R[h] */ + if (tb->R[h] && tb->rnum[h] == -B_NR_ITEMS(tb->R[h]) - 1) { RFALSE(tb->lnum[h] != 0, "invalid tb->lnum[%d]==%d when joining S[h] with R[h]", h, tb->lnum[h]); @@ -671,17 +718,18 @@ static void balance_internal_when_delete(struct tree_balance *tb, return; } - if (tb->lnum[h] < 0) { /* borrow from left neighbor L[h] */ + /* borrow from left neighbor L[h] */ + if (tb->lnum[h] < 0) { RFALSE(tb->rnum[h] != 0, "wrong tb->rnum[%d]==%d when borrow from L[h]", h, tb->rnum[h]); - /*internal_shift_right (tb, h, tb->L[h], tb->CFL[h], tb->lkey[h], tb->S[h], -tb->lnum[h]); */ internal_shift_right(INTERNAL_SHIFT_FROM_L_TO_S, tb, h, -tb->lnum[h]); return; } - if (tb->rnum[h] < 0) { /* borrow from right neighbor R[h] */ + /* borrow from right neighbor R[h] */ + if (tb->rnum[h] < 0) { RFALSE(tb->lnum[h] != 0, "invalid tb->lnum[%d]==%d when borrow from R[h]", h, tb->lnum[h]); @@ -689,7 +737,8 @@ static void balance_internal_when_delete(struct tree_balance *tb, return; } - if (tb->lnum[h] > 0) { /* split S[h] into two parts and put them into neighbors */ + /* split S[h] into two parts and put them into neighbors */ + if (tb->lnum[h] > 0) { RFALSE(tb->rnum[h] == 0 || tb->lnum[h] + tb->rnum[h] != n + 1, "invalid tb->lnum[%d]==%d or tb->rnum[%d]==%d when S[h](item number == %d) is split between them", h, tb->lnum[h], h, tb->rnum[h], n); @@ -737,29 +786,36 @@ static void replace_rkey(struct tree_balance *tb, int h, struct item_head *key) do_balance_mark_internal_dirty(tb, tb->CFR[h], 0); } -int balance_internal(struct tree_balance *tb, /* tree_balance structure */ - int h, /* level of the tree */ - int child_pos, struct item_head *insert_key, /* key for insertion on higher level */ - struct buffer_head **insert_ptr /* node for insertion on higher level */ - ) - /* if inserting/pasting - { - child_pos is the position of the node-pointer in S[h] that * - pointed to S[h-1] before balancing of the h-1 level; * - this means that new pointers and items must be inserted AFTER * - child_pos - } - else - { - it is the position of the leftmost pointer that must be deleted (together with - its corresponding key to the left of the pointer) - as a result of the previous level's balancing. - } - */ + +/* + * if inserting/pasting { + * child_pos is the position of the node-pointer in S[h] that + * pointed to S[h-1] before balancing of the h-1 level; + * this means that new pointers and items must be inserted AFTER + * child_pos + * } else { + * it is the position of the leftmost pointer that must be deleted + * (together with its corresponding key to the left of the pointer) + * as a result of the previous level's balancing. + * } + */ + +int balance_internal(struct tree_balance *tb, + int h, /* level of the tree */ + int child_pos, + /* key for insertion on higher level */ + struct item_head *insert_key, + /* node for insertion on higher level */ + struct buffer_head **insert_ptr) { struct buffer_head *tbSh = PATH_H_PBUFFER(tb->tb_path, h); struct buffer_info bi; - int order; /* we return this: it is 0 if there is no S[h], else it is tb->S[h]->b_item_order */ + + /* + * we return this: it is 0 if there is no S[h], + * else it is tb->S[h]->b_item_order + */ + int order; int insert_num, n, k; struct buffer_head *S_new; struct item_head new_insert_key; @@ -774,8 +830,10 @@ int balance_internal(struct tree_balance *tb, /* tree_balance structure (tbSh) ? PATH_H_POSITION(tb->tb_path, h + 1) /*tb->S[h]->b_item_order */ : 0; - /* Using insert_size[h] calculate the number insert_num of items - that must be inserted to or deleted from S[h]. */ + /* + * Using insert_size[h] calculate the number insert_num of items + * that must be inserted to or deleted from S[h]. + */ insert_num = tb->insert_size[h] / ((int)(KEY_SIZE + DC_SIZE)); /* Check whether insert_num is proper * */ @@ -794,23 +852,21 @@ int balance_internal(struct tree_balance *tb, /* tree_balance structure k = 0; if (tb->lnum[h] > 0) { - /* shift lnum[h] items from S[h] to the left neighbor L[h]. - check how many of new items fall into L[h] or CFL[h] after - shifting */ + /* + * shift lnum[h] items from S[h] to the left neighbor L[h]. + * check how many of new items fall into L[h] or CFL[h] after + * shifting + */ n = B_NR_ITEMS(tb->L[h]); /* number of items in L[h] */ if (tb->lnum[h] <= child_pos) { /* new items don't fall into L[h] or CFL[h] */ internal_shift_left(INTERNAL_SHIFT_FROM_S_TO_L, tb, h, tb->lnum[h]); - /*internal_shift_left (tb->L[h],tb->CFL[h],tb->lkey[h],tbSh,tb->lnum[h]); */ child_pos -= tb->lnum[h]; } else if (tb->lnum[h] > child_pos + insert_num) { /* all new items fall into L[h] */ internal_shift_left(INTERNAL_SHIFT_FROM_S_TO_L, tb, h, tb->lnum[h] - insert_num); - /* internal_shift_left(tb->L[h],tb->CFL[h],tb->lkey[h],tbSh, - tb->lnum[h]-insert_num); - */ /* insert insert_num keys and node-pointers into L[h] */ bi.tb = tb; bi.bi_bh = tb->L[h]; @@ -826,7 +882,10 @@ int balance_internal(struct tree_balance *tb, /* tree_balance structure } else { struct disk_child *dc; - /* some items fall into L[h] or CFL[h], but some don't fall */ + /* + * some items fall into L[h] or CFL[h], + * but some don't fall + */ internal_shift1_left(tb, h, child_pos + 1); /* calculate number of new items that fall into L[h] */ k = tb->lnum[h] - child_pos - 1; @@ -841,7 +900,10 @@ int balance_internal(struct tree_balance *tb, /* tree_balance structure replace_lkey(tb, h, insert_key + k); - /* replace the first node-ptr in S[h] by node-ptr to insert_ptr[k] */ + /* + * replace the first node-ptr in S[h] by + * node-ptr to insert_ptr[k] + */ dc = B_N_CHILD(tbSh, 0); put_dc_size(dc, MAX_CHILD_SIZE(insert_ptr[k]) - @@ -860,17 +922,17 @@ int balance_internal(struct tree_balance *tb, /* tree_balance structure /* tb->lnum[h] > 0 */ if (tb->rnum[h] > 0) { /*shift rnum[h] items from S[h] to the right neighbor R[h] */ - /* check how many of new items fall into R or CFR after shifting */ + /* + * check how many of new items fall into R or CFR + * after shifting + */ n = B_NR_ITEMS(tbSh); /* number of items in S[h] */ if (n - tb->rnum[h] >= child_pos) /* new items fall into S[h] */ - /*internal_shift_right(tb,h,tbSh,tb->CFR[h],tb->rkey[h],tb->R[h],tb->rnum[h]); */ internal_shift_right(INTERNAL_SHIFT_FROM_S_TO_R, tb, h, tb->rnum[h]); else if (n + insert_num - tb->rnum[h] < child_pos) { /* all new items fall into R[h] */ - /*internal_shift_right(tb,h,tbSh,tb->CFR[h],tb->rkey[h],tb->R[h], - tb->rnum[h] - insert_num); */ internal_shift_right(INTERNAL_SHIFT_FROM_S_TO_R, tb, h, tb->rnum[h] - insert_num); @@ -904,7 +966,10 @@ int balance_internal(struct tree_balance *tb, /* tree_balance structure replace_rkey(tb, h, insert_key + insert_num - k - 1); - /* replace the first node-ptr in R[h] by node-ptr insert_ptr[insert_num-k-1] */ + /* + * replace the first node-ptr in R[h] by + * node-ptr insert_ptr[insert_num-k-1] + */ dc = B_N_CHILD(tb->R[h], 0); put_dc_size(dc, MAX_CHILD_SIZE(insert_ptr @@ -921,7 +986,7 @@ int balance_internal(struct tree_balance *tb, /* tree_balance structure } } - /** Fill new node that appears instead of S[h] **/ + /** Fill new node that appears instead of S[h] **/ RFALSE(tb->blknum[h] > 2, "blknum can not be > 2 for internal level"); RFALSE(tb->blknum[h] < 0, "blknum can not be < 0"); @@ -1002,11 +1067,13 @@ int balance_internal(struct tree_balance *tb, /* tree_balance structure /* last parameter is del_par */ internal_move_pointers_items(&dest_bi, &src_bi, LAST_TO_FIRST, snum, 0); - /* internal_move_pointers_items(S_new, tbSh, LAST_TO_FIRST, snum, 0); */ } else if (n + insert_num - snum < child_pos) { /* all new items fall into S_new */ /* store the delimiting key for the next level */ - /* new_insert_key = (n + insert_item - snum)'th key in S[h] */ + /* + * new_insert_key = (n + insert_item - snum)'th + * key in S[h] + */ memcpy(&new_insert_key, internal_key(tbSh, n + insert_num - snum), KEY_SIZE); @@ -1014,9 +1081,11 @@ int balance_internal(struct tree_balance *tb, /* tree_balance structure internal_move_pointers_items(&dest_bi, &src_bi, LAST_TO_FIRST, snum - insert_num, 0); - /* internal_move_pointers_items(S_new,tbSh,1,snum - insert_num,0); */ - /* insert insert_num keys and node-pointers into S_new */ + /* + * insert insert_num keys and node-pointers + * into S_new + */ internal_insert_childs(&dest_bi, /*S_new,tb->S[h-1]->b_next, */ child_pos - n - insert_num + @@ -1033,7 +1102,6 @@ int balance_internal(struct tree_balance *tb, /* tree_balance structure internal_move_pointers_items(&dest_bi, &src_bi, LAST_TO_FIRST, n - child_pos + 1, 1); - /* internal_move_pointers_items(S_new,tbSh,1,n - child_pos + 1,1); */ /* calculate number of new items that fall into S_new */ k = snum - n + child_pos - 1; @@ -1043,7 +1111,10 @@ int balance_internal(struct tree_balance *tb, /* tree_balance structure /* new_insert_key = insert_key[insert_num - k - 1] */ memcpy(&new_insert_key, insert_key + insert_num - k - 1, KEY_SIZE); - /* replace first node-ptr in S_new by node-ptr to insert_ptr[insert_num-k-1] */ + /* + * replace first node-ptr in S_new by node-ptr + * to insert_ptr[insert_num-k-1] + */ dc = B_N_CHILD(S_new, 0); put_dc_size(dc, @@ -1066,7 +1137,7 @@ int balance_internal(struct tree_balance *tb, /* tree_balance structure || buffer_dirty(S_new), "cm-00001: bad S_new (%b)", S_new); - // S_new is released in unfix_nodes + /* S_new is released in unfix_nodes */ } n = B_NR_ITEMS(tbSh); /*number of items in S[h] */ diff --git a/fs/reiserfs/inode.c b/fs/reiserfs/inode.c index b8d3ffb1f722..cc2095943ec6 100644 --- a/fs/reiserfs/inode.c +++ b/fs/reiserfs/inode.c @@ -25,7 +25,10 @@ int reiserfs_commit_write(struct file *f, struct page *page, void reiserfs_evict_inode(struct inode *inode) { - /* We need blocks for transaction + (user+group) quota update (possibly delete) */ + /* + * We need blocks for transaction + (user+group) quota + * update (possibly delete) + */ int jbegin_count = JOURNAL_PER_BALANCE_CNT * 2 + 2 * REISERFS_QUOTA_INIT_BLOCKS(inode->i_sb); @@ -39,8 +42,12 @@ void reiserfs_evict_inode(struct inode *inode) if (inode->i_nlink) goto no_delete; - /* The = 0 happens when we abort creating a new inode for some reason like lack of space.. */ - if (!(inode->i_state & I_NEW) && INODE_PKEY(inode)->k_objectid != 0) { /* also handles bad_inode case */ + /* + * The = 0 happens when we abort creating a new inode + * for some reason like lack of space.. + * also handles bad_inode case + */ + if (!(inode->i_state & I_NEW) && INODE_PKEY(inode)->k_objectid != 0) { reiserfs_delete_xattrs(inode); @@ -54,9 +61,11 @@ void reiserfs_evict_inode(struct inode *inode) err = reiserfs_delete_object(&th, inode); - /* Do quota update inside a transaction for journaled quotas. We must do that - * after delete_object so that quota updates go into the same transaction as - * stat data deletion */ + /* + * Do quota update inside a transaction for journaled quotas. + * We must do that after delete_object so that quota updates + * go into the same transaction as stat data deletion + */ if (!err) { int depth = reiserfs_write_unlock_nested(inode->i_sb); dquot_free_inode(inode); @@ -66,22 +75,29 @@ void reiserfs_evict_inode(struct inode *inode) if (journal_end(&th, inode->i_sb, jbegin_count)) goto out; - /* check return value from reiserfs_delete_object after + /* + * check return value from reiserfs_delete_object after * ending the transaction */ if (err) goto out; - /* all items of file are deleted, so we can remove "save" link */ - remove_save_link(inode, 0 /* not truncate */ ); /* we can't do anything - * about an error here */ + /* + * all items of file are deleted, so we can remove + * "save" link + * we can't do anything about an error here + */ + remove_save_link(inode, 0 /* not truncate */); out: reiserfs_write_unlock(inode->i_sb); } else { /* no object items are in the tree */ ; } - clear_inode(inode); /* note this must go after the journal_end to prevent deadlock */ + + /* note this must go after the journal_end to prevent deadlock */ + clear_inode(inode); + dquot_drop(inode); inode->i_blocks = 0; return; @@ -103,8 +119,10 @@ static void _make_cpu_key(struct cpu_key *key, int version, __u32 dirid, key->key_length = length; } -/* take base of inode_key (it comes from inode always) (dirid, objectid) and version from an inode, set - offset and type of key */ +/* + * take base of inode_key (it comes from inode always) (dirid, objectid) + * and version from an inode, set offset and type of key + */ void make_cpu_key(struct cpu_key *key, struct inode *inode, loff_t offset, int type, int length) { @@ -114,9 +132,7 @@ void make_cpu_key(struct cpu_key *key, struct inode *inode, loff_t offset, length); } -// -// when key is 0, do not set version and short key -// +/* when key is 0, do not set version and short key */ inline void make_le_item_head(struct item_head *ih, const struct cpu_key *key, int version, loff_t offset, int type, int length, @@ -132,43 +148,47 @@ inline void make_le_item_head(struct item_head *ih, const struct cpu_key *key, set_le_ih_k_type(ih, type); put_ih_item_len(ih, length); /* set_ih_free_space (ih, 0); */ - // for directory items it is entry count, for directs and stat - // datas - 0xffff, for indirects - 0 + /* + * for directory items it is entry count, for directs and stat + * datas - 0xffff, for indirects - 0 + */ put_ih_entry_count(ih, entry_count); } -// -// FIXME: we might cache recently accessed indirect item - -// Ugh. Not too eager for that.... -// I cut the code until such time as I see a convincing argument (benchmark). -// I don't want a bloated inode struct..., and I don't like code complexity.... - -/* cutting the code is fine, since it really isn't in use yet and is easy -** to add back in. But, Vladimir has a really good idea here. Think -** about what happens for reading a file. For each page, -** The VFS layer calls reiserfs_readpage, who searches the tree to find -** an indirect item. This indirect item has X number of pointers, where -** X is a big number if we've done the block allocation right. But, -** we only use one or two of these pointers during each call to readpage, -** needlessly researching again later on. -** -** The size of the cache could be dynamic based on the size of the file. -** -** I'd also like to see us cache the location the stat data item, since -** we are needlessly researching for that frequently. -** -** --chris -*/ +/* + * FIXME: we might cache recently accessed indirect item + * Ugh. Not too eager for that.... + * I cut the code until such time as I see a convincing argument (benchmark). + * I don't want a bloated inode struct..., and I don't like code complexity.... + */ -/* If this page has a file tail in it, and -** it was read in by get_block_create_0, the page data is valid, -** but tail is still sitting in a direct item, and we can't write to -** it. So, look through this page, and check all the mapped buffers -** to make sure they have valid block numbers. Any that don't need -** to be unmapped, so that __block_write_begin will correctly call -** reiserfs_get_block to convert the tail into an unformatted node -*/ +/* + * cutting the code is fine, since it really isn't in use yet and is easy + * to add back in. But, Vladimir has a really good idea here. Think + * about what happens for reading a file. For each page, + * The VFS layer calls reiserfs_readpage, who searches the tree to find + * an indirect item. This indirect item has X number of pointers, where + * X is a big number if we've done the block allocation right. But, + * we only use one or two of these pointers during each call to readpage, + * needlessly researching again later on. + * + * The size of the cache could be dynamic based on the size of the file. + * + * I'd also like to see us cache the location the stat data item, since + * we are needlessly researching for that frequently. + * + * --chris + */ + +/* + * If this page has a file tail in it, and + * it was read in by get_block_create_0, the page data is valid, + * but tail is still sitting in a direct item, and we can't write to + * it. So, look through this page, and check all the mapped buffers + * to make sure they have valid block numbers. Any that don't need + * to be unmapped, so that __block_write_begin will correctly call + * reiserfs_get_block to convert the tail into an unformatted node + */ static inline void fix_tail_page_for_writing(struct page *page) { struct buffer_head *head, *next, *bh; @@ -186,8 +206,10 @@ static inline void fix_tail_page_for_writing(struct page *page) } } -/* reiserfs_get_block does not need to allocate a block only if it has been - done already or non-hole position has been found in the indirect item */ +/* + * reiserfs_get_block does not need to allocate a block only if it has been + * done already or non-hole position has been found in the indirect item + */ static inline int allocation_needed(int retval, b_blocknr_t allocated, struct item_head *ih, __le32 * item, int pos_in_item) @@ -211,14 +233,16 @@ static inline void set_block_dev_mapped(struct buffer_head *bh, map_bh(bh, inode->i_sb, block); } -// -// files which were created in the earlier version can not be longer, -// than 2 gb -// +/* + * files which were created in the earlier version can not be longer, + * than 2 gb + */ static int file_capable(struct inode *inode, sector_t block) { - if (get_inode_item_key_version(inode) != KEY_FORMAT_3_5 || // it is new file. - block < (1 << (31 - inode->i_sb->s_blocksize_bits))) // old file, but 'block' is inside of 2gb + /* it is new file. */ + if (get_inode_item_key_version(inode) != KEY_FORMAT_3_5 || + /* old file, but 'block' is inside of 2gb */ + block < (1 << (31 - inode->i_sb->s_blocksize_bits))) return 1; return 0; @@ -250,14 +274,14 @@ static int restart_transaction(struct reiserfs_transaction_handle *th, return err; } -// it is called by get_block when create == 0. Returns block number -// for 'block'-th logical block of file. When it hits direct item it -// returns 0 (being called from bmap) or read direct item into piece -// of page (bh_result) - -// Please improve the english/clarity in the comment above, as it is -// hard to understand. - +/* + * it is called by get_block when create == 0. Returns block number + * for 'block'-th logical block of file. When it hits direct item it + * returns 0 (being called from bmap) or read direct item into piece + * of page (bh_result) + * Please improve the english/clarity in the comment above, as it is + * hard to understand. + */ static int _get_block_create_0(struct inode *inode, sector_t block, struct buffer_head *bh_result, int args) { @@ -273,7 +297,7 @@ static int _get_block_create_0(struct inode *inode, sector_t block, int done = 0; unsigned long offset; - // prepare the key to look for the 'block'-th block of file + /* prepare the key to look for the 'block'-th block of file */ make_cpu_key(&key, inode, (loff_t) block * inode->i_sb->s_blocksize + 1, TYPE_ANY, 3); @@ -285,23 +309,28 @@ static int _get_block_create_0(struct inode *inode, sector_t block, kunmap(bh_result->b_page); if (result == IO_ERROR) return -EIO; - // We do not return -ENOENT if there is a hole but page is uptodate, because it means - // That there is some MMAPED data associated with it that is yet to be written to disk. + /* + * We do not return -ENOENT if there is a hole but page is + * uptodate, because it means that there is some MMAPED data + * associated with it that is yet to be written to disk. + */ if ((args & GET_BLOCK_NO_HOLE) && !PageUptodate(bh_result->b_page)) { return -ENOENT; } return 0; } - // + bh = get_last_bh(&path); ih = tp_item_head(&path); if (is_indirect_le_ih(ih)) { __le32 *ind_item = (__le32 *) ih_item_body(bh, ih); - /* FIXME: here we could cache indirect item or part of it in - the inode to avoid search_by_key in case of subsequent - access to file */ + /* + * FIXME: here we could cache indirect item or part of it in + * the inode to avoid search_by_key in case of subsequent + * access to file + */ blocknr = get_block_num(ind_item, path.pos_in_item); ret = 0; if (blocknr) { @@ -311,8 +340,12 @@ static int _get_block_create_0(struct inode *inode, sector_t block, set_buffer_boundary(bh_result); } } else - // We do not return -ENOENT if there is a hole but page is uptodate, because it means - // That there is some MMAPED data associated with it that is yet to be written to disk. + /* + * We do not return -ENOENT if there is a hole but + * page is uptodate, because it means that there is + * some MMAPED data associated with it that is + * yet to be written to disk. + */ if ((args & GET_BLOCK_NO_HOLE) && !PageUptodate(bh_result->b_page)) { ret = -ENOENT; @@ -323,41 +356,45 @@ static int _get_block_create_0(struct inode *inode, sector_t block, kunmap(bh_result->b_page); return ret; } - // requested data are in direct item(s) + /* requested data are in direct item(s) */ if (!(args & GET_BLOCK_READ_DIRECT)) { - // we are called by bmap. FIXME: we can not map block of file - // when it is stored in direct item(s) + /* + * we are called by bmap. FIXME: we can not map block of file + * when it is stored in direct item(s) + */ pathrelse(&path); if (p) kunmap(bh_result->b_page); return -ENOENT; } - /* if we've got a direct item, and the buffer or page was uptodate, - ** we don't want to pull data off disk again. skip to the - ** end, where we map the buffer and return + /* + * if we've got a direct item, and the buffer or page was uptodate, + * we don't want to pull data off disk again. skip to the + * end, where we map the buffer and return */ if (buffer_uptodate(bh_result)) { goto finished; } else /* - ** grab_tail_page can trigger calls to reiserfs_get_block on up to date - ** pages without any buffers. If the page is up to date, we don't want - ** read old data off disk. Set the up to date bit on the buffer instead - ** and jump to the end + * grab_tail_page can trigger calls to reiserfs_get_block on + * up to date pages without any buffers. If the page is up + * to date, we don't want read old data off disk. Set the up + * to date bit on the buffer instead and jump to the end */ if (!bh_result->b_page || PageUptodate(bh_result->b_page)) { set_buffer_uptodate(bh_result); goto finished; } - // read file tail into part of page + /* read file tail into part of page */ offset = (cpu_key_k_offset(&key) - 1) & (PAGE_CACHE_SIZE - 1); copy_item_head(&tmp_ih, ih); - /* we only want to kmap if we are reading the tail into the page. - ** this is not the common case, so we don't kmap until we are - ** sure we need to. But, this means the item might move if - ** kmap schedules + /* + * we only want to kmap if we are reading the tail into the page. + * this is not the common case, so we don't kmap until we are + * sure we need to. But, this means the item might move if + * kmap schedules */ if (!p) p = (char *)kmap(bh_result->b_page); @@ -368,10 +405,11 @@ static int _get_block_create_0(struct inode *inode, sector_t block, if (!is_direct_le_ih(ih)) { BUG(); } - /* make sure we don't read more bytes than actually exist in - ** the file. This can happen in odd cases where i_size isn't - ** correct, and when direct item padding results in a few - ** extra bytes at the end of the direct item + /* + * make sure we don't read more bytes than actually exist in + * the file. This can happen in odd cases where i_size isn't + * correct, and when direct item padding results in a few + * extra bytes at the end of the direct item */ if ((le_ih_k_offset(ih) + path.pos_in_item) > inode->i_size) break; @@ -390,18 +428,20 @@ static int _get_block_create_0(struct inode *inode, sector_t block, p += chars; + /* + * we done, if read direct item is not the last item of + * node FIXME: we could try to check right delimiting key + * to see whether direct item continues in the right + * neighbor or rely on i_size + */ if (PATH_LAST_POSITION(&path) != (B_NR_ITEMS(bh) - 1)) - // we done, if read direct item is not the last item of - // node FIXME: we could try to check right delimiting key - // to see whether direct item continues in the right - // neighbor or rely on i_size break; - // update key to look for the next piece + /* update key to look for the next piece */ set_cpu_key_k_offset(&key, cpu_key_k_offset(&key) + chars); result = search_for_position_by_key(inode->i_sb, &key, &path); if (result != POSITION_FOUND) - // i/o error most likely + /* i/o error most likely */ break; bh = get_last_bh(&path); ih = tp_item_head(&path); @@ -416,7 +456,8 @@ static int _get_block_create_0(struct inode *inode, sector_t block, if (result == IO_ERROR) return -EIO; - /* this buffer has valid data, but isn't valid for io. mapping it to + /* + * this buffer has valid data, but isn't valid for io. mapping it to * block #0 tells the rest of reiserfs it just has a tail in it */ map_bh(bh_result, inode->i_sb, 0); @@ -424,8 +465,10 @@ static int _get_block_create_0(struct inode *inode, sector_t block, return 0; } -// this is called to create file map. So, _get_block_create_0 will not -// read direct item +/* + * this is called to create file map. So, _get_block_create_0 will not + * read direct item + */ static int reiserfs_bmap(struct inode *inode, sector_t block, struct buffer_head *bh_result, int create) { @@ -439,22 +482,23 @@ static int reiserfs_bmap(struct inode *inode, sector_t block, return 0; } -/* special version of get_block that is only used by grab_tail_page right -** now. It is sent to __block_write_begin, and when you try to get a -** block past the end of the file (or a block from a hole) it returns -** -ENOENT instead of a valid buffer. __block_write_begin expects to -** be able to do i/o on the buffers returned, unless an error value -** is also returned. -** -** So, this allows __block_write_begin to be used for reading a single block -** in a page. Where it does not produce a valid page for holes, or past the -** end of the file. This turns out to be exactly what we need for reading -** tails for conversion. -** -** The point of the wrapper is forcing a certain value for create, even -** though the VFS layer is calling this function with create==1. If you -** don't want to send create == GET_BLOCK_NO_HOLE to reiserfs_get_block, -** don't use this function. +/* + * special version of get_block that is only used by grab_tail_page right + * now. It is sent to __block_write_begin, and when you try to get a + * block past the end of the file (or a block from a hole) it returns + * -ENOENT instead of a valid buffer. __block_write_begin expects to + * be able to do i/o on the buffers returned, unless an error value + * is also returned. + * + * So, this allows __block_write_begin to be used for reading a single block + * in a page. Where it does not produce a valid page for holes, or past the + * end of the file. This turns out to be exactly what we need for reading + * tails for conversion. + * + * The point of the wrapper is forcing a certain value for create, even + * though the VFS layer is calling this function with create==1. If you + * don't want to send create == GET_BLOCK_NO_HOLE to reiserfs_get_block, + * don't use this function. */ static int reiserfs_get_block_create_0(struct inode *inode, sector_t block, struct buffer_head *bh_result, @@ -463,8 +507,10 @@ static int reiserfs_get_block_create_0(struct inode *inode, sector_t block, return reiserfs_get_block(inode, block, bh_result, GET_BLOCK_NO_HOLE); } -/* This is special helper for reiserfs_get_block in case we are executing - direct_IO request. */ +/* + * This is special helper for reiserfs_get_block in case we are executing + * direct_IO request. + */ static int reiserfs_get_blocks_direct_io(struct inode *inode, sector_t iblock, struct buffer_head *bh_result, @@ -474,9 +520,11 @@ static int reiserfs_get_blocks_direct_io(struct inode *inode, bh_result->b_page = NULL; - /* We set the b_size before reiserfs_get_block call since it is - referenced in convert_tail_for_hole() that may be called from - reiserfs_get_block() */ + /* + * We set the b_size before reiserfs_get_block call since it is + * referenced in convert_tail_for_hole() that may be called from + * reiserfs_get_block() + */ bh_result->b_size = (1 << inode->i_blkbits); ret = reiserfs_get_block(inode, iblock, bh_result, @@ -486,14 +534,18 @@ static int reiserfs_get_blocks_direct_io(struct inode *inode, /* don't allow direct io onto tail pages */ if (buffer_mapped(bh_result) && bh_result->b_blocknr == 0) { - /* make sure future calls to the direct io funcs for this offset - ** in the file fail by unmapping the buffer + /* + * make sure future calls to the direct io funcs for this + * offset in the file fail by unmapping the buffer */ clear_buffer_mapped(bh_result); ret = -EINVAL; } - /* Possible unpacked tail. Flush the data before pages have - disappeared */ + + /* + * Possible unpacked tail. Flush the data before pages have + * disappeared + */ if (REISERFS_I(inode)->i_flags & i_pack_on_close_mask) { int err; @@ -512,15 +564,15 @@ static int reiserfs_get_blocks_direct_io(struct inode *inode, } /* -** helper function for when reiserfs_get_block is called for a hole -** but the file tail is still in a direct item -** bh_result is the buffer head for the hole -** tail_offset is the offset of the start of the tail in the file -** -** This calls prepare_write, which will start a new transaction -** you should not be in a transaction, or have any paths held when you -** call this. -*/ + * helper function for when reiserfs_get_block is called for a hole + * but the file tail is still in a direct item + * bh_result is the buffer head for the hole + * tail_offset is the offset of the start of the tail in the file + * + * This calls prepare_write, which will start a new transaction + * you should not be in a transaction, or have any paths held when you + * call this. + */ static int convert_tail_for_hole(struct inode *inode, struct buffer_head *bh_result, loff_t tail_offset) @@ -540,9 +592,10 @@ static int convert_tail_for_hole(struct inode *inode, tail_end = (tail_start | (bh_result->b_size - 1)) + 1; index = tail_offset >> PAGE_CACHE_SHIFT; - /* hole_page can be zero in case of direct_io, we are sure - that we cannot get here if we write with O_DIRECT into - tail page */ + /* + * hole_page can be zero in case of direct_io, we are sure + * that we cannot get here if we write with O_DIRECT into tail page + */ if (!hole_page || index != hole_page->index) { tail_page = grab_cache_page(inode->i_mapping, index); retval = -ENOMEM; @@ -553,14 +606,15 @@ static int convert_tail_for_hole(struct inode *inode, tail_page = hole_page; } - /* we don't have to make sure the conversion did not happen while - ** we were locking the page because anyone that could convert - ** must first take i_mutex. - ** - ** We must fix the tail page for writing because it might have buffers - ** that are mapped, but have a block number of 0. This indicates tail - ** data that has been read directly into the page, and - ** __block_write_begin won't trigger a get_block in this case. + /* + * we don't have to make sure the conversion did not happen while + * we were locking the page because anyone that could convert + * must first take i_mutex. + * + * We must fix the tail page for writing because it might have buffers + * that are mapped, but have a block number of 0. This indicates tail + * data that has been read directly into the page, and + * __block_write_begin won't trigger a get_block in this case. */ fix_tail_page_for_writing(tail_page); retval = __reiserfs_write_begin(tail_page, tail_start, @@ -604,7 +658,8 @@ int reiserfs_get_block(struct inode *inode, sector_t block, struct buffer_head *bh_result, int create) { int repeat, retval = 0; - b_blocknr_t allocated_block_nr = 0; // b_blocknr_t is (unsigned) 32 bit int + /* b_blocknr_t is (unsigned) 32 bit int*/ + b_blocknr_t allocated_block_nr = 0; INITIALIZE_PATH(path); int pos_in_item; struct cpu_key key; @@ -614,12 +669,14 @@ int reiserfs_get_block(struct inode *inode, sector_t block, int done; int fs_gen; struct reiserfs_transaction_handle *th = NULL; - /* space reserved in transaction batch: - . 3 balancings in direct->indirect conversion - . 1 block involved into reiserfs_update_sd() - XXX in practically impossible worst case direct2indirect() - can incur (much) more than 3 balancings. - quota update for user, group */ + /* + * space reserved in transaction batch: + * . 3 balancings in direct->indirect conversion + * . 1 block involved into reiserfs_update_sd() + * XXX in practically impossible worst case direct2indirect() + * can incur (much) more than 3 balancings. + * quota update for user, group + */ int jbegin_count = JOURNAL_PER_BALANCE_CNT * 3 + 1 + 2 * REISERFS_QUOTA_TRANS_BLOCKS(inode->i_sb); @@ -636,8 +693,9 @@ int reiserfs_get_block(struct inode *inode, sector_t block, return -EFBIG; } - /* if !create, we aren't changing the FS, so we don't need to - ** log anything, so we don't need to start a transaction + /* + * if !create, we aren't changing the FS, so we don't need to + * log anything, so we don't need to start a transaction */ if (!(create & GET_BLOCK_CREATE)) { int ret; @@ -647,6 +705,7 @@ int reiserfs_get_block(struct inode *inode, sector_t block, reiserfs_write_unlock(inode->i_sb); return ret; } + /* * if we're already in a transaction, make sure to close * any new transactions we start in this func @@ -655,8 +714,10 @@ int reiserfs_get_block(struct inode *inode, sector_t block, reiserfs_transaction_running(inode->i_sb)) dangle = 0; - /* If file is of such a size, that it might have a tail and tails are enabled - ** we should mark it as possibly needing tail packing on close + /* + * If file is of such a size, that it might have a tail and + * tails are enabled we should mark it as possibly needing + * tail packing on close */ if ((have_large_tails(inode->i_sb) && inode->i_size < i_block_size(inode) * 4) @@ -703,11 +764,12 @@ int reiserfs_get_block(struct inode *inode, sector_t block, _allocate_block(th, block, inode, &allocated_block_nr, &path, create); + /* + * restart the transaction to give the journal a chance to free + * some blocks. releases the path, so we have to go back to + * research if we succeed on the second try + */ if (repeat == NO_DISK_SPACE || repeat == QUOTA_EXCEEDED) { - /* restart the transaction to give the journal a chance to free - ** some blocks. releases the path, so we have to go back to - ** research if we succeed on the second try - */ SB_JOURNAL(inode->i_sb)->j_next_async_flush = 1; retval = restart_transaction(th, inode, &path); if (retval) @@ -734,9 +796,11 @@ int reiserfs_get_block(struct inode *inode, sector_t block, if (indirect_item_found(retval, ih)) { b_blocknr_t unfm_ptr; - /* 'block'-th block is in the file already (there is - corresponding cell in some indirect item). But it may be - zero unformatted node pointer (hole) */ + /* + * 'block'-th block is in the file already (there is + * corresponding cell in some indirect item). But it may be + * zero unformatted node pointer (hole) + */ unfm_ptr = get_block_num(item, pos_in_item); if (unfm_ptr == 0) { /* use allocated block to plug the hole */ @@ -764,9 +828,10 @@ int reiserfs_get_block(struct inode *inode, sector_t block, reiserfs_write_unlock(inode->i_sb); - /* the item was found, so new blocks were not added to the file - ** there is no need to make sure the inode is updated with this - ** transaction + /* + * the item was found, so new blocks were not added to the file + * there is no need to make sure the inode is updated with this + * transaction */ return retval; } @@ -776,9 +841,11 @@ int reiserfs_get_block(struct inode *inode, sector_t block, goto start_trans; } - /* desired position is not found or is in the direct item. We have - to append file with holes up to 'block'-th block converting - direct items to indirect one if necessary */ + /* + * desired position is not found or is in the direct item. We have + * to append file with holes up to 'block'-th block converting + * direct items to indirect one if necessary + */ done = 0; do { if (is_statdata_le_ih(ih)) { @@ -790,16 +857,18 @@ int reiserfs_get_block(struct inode *inode, sector_t block, TYPE_INDIRECT, UNFM_P_SIZE, 0 /* free_space */ ); + /* + * we are going to add 'block'-th block to the file. + * Use allocated block for that + */ if (cpu_key_k_offset(&key) == 1) { - /* we are going to add 'block'-th block to the file. Use - allocated block for that */ unp = cpu_to_le32(allocated_block_nr); set_block_dev_mapped(bh_result, allocated_block_nr, inode); set_buffer_new(bh_result); done = 1; } - tmp_key = key; // ;) + tmp_key = key; /* ;) */ set_cpu_key_k_offset(&tmp_key, 1); PATH_LAST_POSITION(&path)++; @@ -809,9 +878,12 @@ int reiserfs_get_block(struct inode *inode, sector_t block, if (retval) { reiserfs_free_block(th, inode, allocated_block_nr, 1); - goto failure; // retval == -ENOSPC, -EDQUOT or -EIO or -EEXIST + /* + * retval == -ENOSPC, -EDQUOT or -EIO + * or -EEXIST + */ + goto failure; } - //mark_tail_converted (inode); } else if (is_direct_le_ih(ih)) { /* direct item has to be converted */ loff_t tail_offset; @@ -819,18 +891,24 @@ int reiserfs_get_block(struct inode *inode, sector_t block, tail_offset = ((le_ih_k_offset(ih) - 1) & ~(inode->i_sb->s_blocksize - 1)) + 1; + + /* + * direct item we just found fits into block we have + * to map. Convert it into unformatted node: use + * bh_result for the conversion + */ if (tail_offset == cpu_key_k_offset(&key)) { - /* direct item we just found fits into block we have - to map. Convert it into unformatted node: use - bh_result for the conversion */ set_block_dev_mapped(bh_result, allocated_block_nr, inode); unbh = bh_result; done = 1; } else { - /* we have to padd file tail stored in direct item(s) - up to block size and convert it to unformatted - node. FIXME: this should also get into page cache */ + /* + * we have to pad file tail stored in direct + * item(s) up to block size and convert it + * to unformatted node. FIXME: this should + * also get into page cache + */ pathrelse(&path); /* @@ -859,7 +937,10 @@ int reiserfs_get_block(struct inode *inode, sector_t block, inode->i_ino, retval); if (allocated_block_nr) { - /* the bitmap, the super, and the stat data == 3 */ + /* + * the bitmap, the super, + * and the stat data == 3 + */ if (!th) th = reiserfs_persistent_transaction(inode->i_sb, 3); if (th) @@ -881,43 +962,57 @@ int reiserfs_get_block(struct inode *inode, sector_t block, allocated_block_nr, 1); goto failure; } - /* it is important the set_buffer_uptodate is done after - ** the direct2indirect. The buffer might contain valid - ** data newer than the data on disk (read by readpage, changed, - ** and then sent here by writepage). direct2indirect needs - ** to know if unbh was already up to date, so it can decide - ** if the data in unbh needs to be replaced with data from - ** the disk + /* + * it is important the set_buffer_uptodate is done + * after the direct2indirect. The buffer might + * contain valid data newer than the data on disk + * (read by readpage, changed, and then sent here by + * writepage). direct2indirect needs to know if unbh + * was already up to date, so it can decide if the + * data in unbh needs to be replaced with data from + * the disk */ set_buffer_uptodate(unbh); - /* unbh->b_page == NULL in case of DIRECT_IO request, this means - buffer will disappear shortly, so it should not be added to + /* + * unbh->b_page == NULL in case of DIRECT_IO request, + * this means buffer will disappear shortly, so it + * should not be added to */ if (unbh->b_page) { - /* we've converted the tail, so we must - ** flush unbh before the transaction commits + /* + * we've converted the tail, so we must + * flush unbh before the transaction commits */ reiserfs_add_tail_list(inode, unbh); - /* mark it dirty now to prevent commit_write from adding - ** this buffer to the inode's dirty buffer list + /* + * mark it dirty now to prevent commit_write + * from adding this buffer to the inode's + * dirty buffer list */ /* - * AKPM: changed __mark_buffer_dirty to mark_buffer_dirty(). - * It's still atomic, but it sets the page dirty too, - * which makes it eligible for writeback at any time by the - * VM (which was also the case with __mark_buffer_dirty()) + * AKPM: changed __mark_buffer_dirty to + * mark_buffer_dirty(). It's still atomic, + * but it sets the page dirty too, which makes + * it eligible for writeback at any time by the + * VM (which was also the case with + * __mark_buffer_dirty()) */ mark_buffer_dirty(unbh); } } else { - /* append indirect item with holes if needed, when appending - pointer to 'block'-th block use block, which is already - allocated */ + /* + * append indirect item with holes if needed, when + * appending pointer to 'block'-th block use block, + * which is already allocated + */ struct cpu_key tmp_key; - unp_t unf_single = 0; // We use this in case we need to allocate only - // one block which is a fastpath + /* + * We use this in case we need to allocate + * only one block which is a fastpath + */ + unp_t unf_single = 0; unp_t *un; __u64 max_to_insert = MAX_ITEM_LEN(inode->i_sb->s_blocksize) / @@ -926,14 +1021,17 @@ int reiserfs_get_block(struct inode *inode, sector_t block, RFALSE(pos_in_item != ih_item_len(ih) / UNFM_P_SIZE, "vs-804: invalid position for append"); - /* indirect item has to be appended, set up key of that position */ + /* + * indirect item has to be appended, + * set up key of that position + * (key type is unimportant) + */ make_cpu_key(&tmp_key, inode, le_key_k_offset(version, &(ih->ih_key)) + op_bytes_number(ih, inode->i_sb->s_blocksize), - //pos_in_item * inode->i_sb->s_blocksize, - TYPE_INDIRECT, 3); // key type is unimportant + TYPE_INDIRECT, 3); RFALSE(cpu_key_k_offset(&tmp_key) > cpu_key_k_offset(&key), "green-805: invalid offset"); @@ -954,8 +1052,10 @@ int reiserfs_get_block(struct inode *inode, sector_t block, } } if (blocks_needed <= max_to_insert) { - /* we are going to add target block to the file. Use allocated - block for that */ + /* + * we are going to add target block to + * the file. Use allocated block for that + */ un[blocks_needed - 1] = cpu_to_le32(allocated_block_nr); set_block_dev_mapped(bh_result, @@ -964,8 +1064,11 @@ int reiserfs_get_block(struct inode *inode, sector_t block, done = 1; } else { /* paste hole to the indirect item */ - /* If kmalloc failed, max_to_insert becomes zero and it means we - only have space for one block */ + /* + * If kmalloc failed, max_to_insert becomes + * zero and it means we only have space for + * one block + */ blocks_needed = max_to_insert ? max_to_insert : 1; } @@ -984,9 +1087,12 @@ int reiserfs_get_block(struct inode *inode, sector_t block, goto failure; } if (!done) { - /* We need to mark new file size in case this function will be - interrupted/aborted later on. And we may do this only for - holes. */ + /* + * We need to mark new file size in case + * this function will be interrupted/aborted + * later on. And we may do this only for + * holes. + */ inode->i_size += inode->i_sb->s_blocksize * blocks_needed; } @@ -995,13 +1101,13 @@ int reiserfs_get_block(struct inode *inode, sector_t block, if (done == 1) break; - /* this loop could log more blocks than we had originally asked - ** for. So, we have to allow the transaction to end if it is - ** too big or too full. Update the inode so things are - ** consistent if we crash before the function returns - ** - ** release the path so that anybody waiting on the path before - ** ending their transaction will be able to continue. + /* + * this loop could log more blocks than we had originally + * asked for. So, we have to allow the transaction to end + * if it is too big or too full. Update the inode so things + * are consistent if we crash before the function returns + * release the path so that anybody waiting on the path before + * ending their transaction will be able to continue. */ if (journal_transaction_should_end(th, th->t_blocks_allocated)) { retval = restart_transaction(th, inode, &path); @@ -1060,8 +1166,10 @@ reiserfs_readpages(struct file *file, struct address_space *mapping, return mpage_readpages(mapping, pages, nr_pages, reiserfs_get_block); } -/* Compute real number of used bytes by file - * Following three functions can go away when we'll have enough space in stat item +/* + * Compute real number of used bytes by file + * Following three functions can go away when we'll have enough space in + * stat item */ static int real_space_diff(struct inode *inode, int sd_size) { @@ -1071,13 +1179,14 @@ static int real_space_diff(struct inode *inode, int sd_size) if (S_ISLNK(inode->i_mode) || S_ISDIR(inode->i_mode)) return sd_size; - /* End of file is also in full block with indirect reference, so round - ** up to the next block. - ** - ** there is just no way to know if the tail is actually packed - ** on the file, so we have to assume it isn't. When we pack the - ** tail, we add 4 bytes to pretend there really is an unformatted - ** node pointer + /* + * End of file is also in full block with indirect reference, so round + * up to the next block. + * + * there is just no way to know if the tail is actually packed + * on the file, so we have to assume it isn't. When we pack the + * tail, we add 4 bytes to pretend there really is an unformatted + * node pointer */ bytes = ((inode->i_size + @@ -1108,29 +1217,29 @@ static inline ulong to_fake_used_blocks(struct inode *inode, int sd_size) bytes += (loff_t) 511; } - /* files from before the quota patch might i_blocks such that - ** bytes < real_space. Deal with that here to prevent it from - ** going negative. + /* + * files from before the quota patch might i_blocks such that + * bytes < real_space. Deal with that here to prevent it from + * going negative. */ if (bytes < real_space) return 0; return (bytes - real_space) >> 9; } -// -// BAD: new directories have stat data of new type and all other items -// of old type. Version stored in the inode says about body items, so -// in update_stat_data we can not rely on inode, but have to check -// item version directly -// +/* + * BAD: new directories have stat data of new type and all other items + * of old type. Version stored in the inode says about body items, so + * in update_stat_data we can not rely on inode, but have to check + * item version directly + */ -// called by read_locked_inode +/* called by read_locked_inode */ static void init_inode(struct inode *inode, struct treepath *path) { struct buffer_head *bh; struct item_head *ih; __u32 rdev; - //int version = ITEM_VERSION_1; bh = PATH_PLAST_BUFFER(path); ih = tp_item_head(path); @@ -1168,20 +1277,26 @@ static void init_inode(struct inode *inode, struct treepath *path) inode->i_generation = le32_to_cpu(INODE_PKEY(inode)->k_dir_id); blocks = (inode->i_size + 511) >> 9; blocks = _ROUND_UP(blocks, inode->i_sb->s_blocksize >> 9); + + /* + * there was a bug in <=3.5.23 when i_blocks could take + * negative values. Starting from 3.5.17 this value could + * even be stored in stat data. For such files we set + * i_blocks based on file size. Just 2 notes: this can be + * wrong for sparse files. On-disk value will be only + * updated if file's inode will ever change + */ if (inode->i_blocks > blocks) { - // there was a bug in <=3.5.23 when i_blocks could take negative - // values. Starting from 3.5.17 this value could even be stored in - // stat data. For such files we set i_blocks based on file - // size. Just 2 notes: this can be wrong for sparce files. On-disk value will be - // only updated if file's inode will ever change inode->i_blocks = blocks; } rdev = sd_v1_rdev(sd); REISERFS_I(inode)->i_first_direct_byte = sd_v1_first_direct_byte(sd); - /* an early bug in the quota code can give us an odd number for the - ** block count. This is incorrect, fix it here. + + /* + * an early bug in the quota code can give us an odd + * number for the block count. This is incorrect, fix it here. */ if (inode->i_blocks & 1) { inode->i_blocks++; @@ -1189,12 +1304,16 @@ static void init_inode(struct inode *inode, struct treepath *path) inode_set_bytes(inode, to_real_used_space(inode, inode->i_blocks, SD_V1_SIZE)); - /* nopack is initially zero for v1 objects. For v2 objects, - nopack is initialised from sd_attrs */ + /* + * nopack is initially zero for v1 objects. For v2 objects, + * nopack is initialised from sd_attrs + */ REISERFS_I(inode)->i_flags &= ~i_nopack_mask; } else { - // new stat data found, but object may have old items - // (directories and symlinks) + /* + * new stat data found, but object may have old items + * (directories and symlinks) + */ struct stat_data *sd = (struct stat_data *)ih_item_body(bh, ih); inode->i_mode = sd_v2_mode(sd); @@ -1225,8 +1344,10 @@ static void init_inode(struct inode *inode, struct treepath *path) inode_set_bytes(inode, to_real_used_space(inode, inode->i_blocks, SD_V2_SIZE)); - /* read persistent inode attributes from sd and initialise - generic inode flags from them */ + /* + * read persistent inode attributes from sd and initialise + * generic inode flags from them + */ REISERFS_I(inode)->i_attrs = sd_v2_attrs(sd); sd_attrs_to_i_attrs(sd_v2_attrs(sd), inode); } @@ -1249,7 +1370,7 @@ static void init_inode(struct inode *inode, struct treepath *path) } } -// update new stat data with inode fields +/* update new stat data with inode fields */ static void inode2sd(void *sd, struct inode *inode, loff_t size) { struct stat_data *sd_v2 = (struct stat_data *)sd; @@ -1273,7 +1394,7 @@ static void inode2sd(void *sd, struct inode *inode, loff_t size) set_sd_v2_attrs(sd_v2, flags); } -// used to copy inode's fields to old stat data +/* used to copy inode's fields to old stat data */ static void inode2sd_v1(void *sd, struct inode *inode, loff_t size) { struct stat_data_v1 *sd_v1 = (struct stat_data_v1 *)sd; @@ -1292,14 +1413,15 @@ static void inode2sd_v1(void *sd, struct inode *inode, loff_t size) else set_sd_v1_blocks(sd_v1, to_fake_used_blocks(inode, SD_V1_SIZE)); - // Sigh. i_first_direct_byte is back + /* Sigh. i_first_direct_byte is back */ set_sd_v1_first_direct_byte(sd_v1, REISERFS_I(inode)->i_first_direct_byte); } -/* NOTE, you must prepare the buffer head before sending it here, -** and then log it after the call -*/ +/* + * NOTE, you must prepare the buffer head before sending it here, + * and then log it after the call + */ static void update_stat_data(struct treepath *path, struct inode *inode, loff_t size) { @@ -1313,8 +1435,8 @@ static void update_stat_data(struct treepath *path, struct inode *inode, reiserfs_panic(inode->i_sb, "vs-13065", "key %k, found item %h", INODE_PKEY(inode), ih); + /* path points to old stat data */ if (stat_data_v1(ih)) { - // path points to old stat data inode2sd_v1(ih_item_body(bh, ih), inode, size); } else { inode2sd(ih_item_body(bh, ih), inode, size); @@ -1335,7 +1457,8 @@ void reiserfs_update_sd_size(struct reiserfs_transaction_handle *th, BUG_ON(!th->t_trans_id); - make_cpu_key(&key, inode, SD_OFFSET, TYPE_STAT_DATA, 3); //key type is unimportant + /* key type is unimportant */ + make_cpu_key(&key, inode, SD_OFFSET, TYPE_STAT_DATA, 3); for (;;) { int pos; @@ -1363,19 +1486,22 @@ void reiserfs_update_sd_size(struct reiserfs_transaction_handle *th, return; } - /* sigh, prepare_for_journal might schedule. When it schedules the - ** FS might change. We have to detect that, and loop back to the - ** search if the stat data item has moved + /* + * sigh, prepare_for_journal might schedule. When it + * schedules the FS might change. We have to detect that, + * and loop back to the search if the stat data item has moved */ bh = get_last_bh(&path); ih = tp_item_head(&path); copy_item_head(&tmp_ih, ih); fs_gen = get_generation(inode->i_sb); reiserfs_prepare_for_journal(inode->i_sb, bh, 1); + + /* Stat_data item has been moved after scheduling. */ if (fs_changed(fs_gen, inode->i_sb) && item_moved(&tmp_ih, &path)) { reiserfs_restore_prepared_buffer(inode->i_sb, bh); - continue; /* Stat_data item has been moved after scheduling. */ + continue; } break; } @@ -1385,23 +1511,23 @@ void reiserfs_update_sd_size(struct reiserfs_transaction_handle *th, return; } -/* reiserfs_read_locked_inode is called to read the inode off disk, and it -** does a make_bad_inode when things go wrong. But, we need to make sure -** and clear the key in the private portion of the inode, otherwise a -** corresponding iput might try to delete whatever object the inode last -** represented. -*/ +/* + * reiserfs_read_locked_inode is called to read the inode off disk, and it + * does a make_bad_inode when things go wrong. But, we need to make sure + * and clear the key in the private portion of the inode, otherwise a + * corresponding iput might try to delete whatever object the inode last + * represented. + */ static void reiserfs_make_bad_inode(struct inode *inode) { memset(INODE_PKEY(inode), 0, KEY_SIZE); make_bad_inode(inode); } -// -// initially this function was derived from minix or ext2's analog and -// evolved as the prototype did -// - +/* + * initially this function was derived from minix or ext2's analog and + * evolved as the prototype did + */ int reiserfs_init_locked_inode(struct inode *inode, void *p) { struct reiserfs_iget_args *args = (struct reiserfs_iget_args *)p; @@ -1410,8 +1536,10 @@ int reiserfs_init_locked_inode(struct inode *inode, void *p) return 0; } -/* looks for stat data in the tree, and fills up the fields of in-core - inode stat data fields */ +/* + * looks for stat data in the tree, and fills up the fields of in-core + * inode stat data fields + */ void reiserfs_read_locked_inode(struct inode *inode, struct reiserfs_iget_args *args) { @@ -1422,8 +1550,10 @@ void reiserfs_read_locked_inode(struct inode *inode, dirino = args->dirid; - /* set version 1, version 2 could be used too, because stat data - key is the same in both versions */ + /* + * set version 1, version 2 could be used too, because stat data + * key is the same in both versions + */ key.version = KEY_FORMAT_3_5; key.on_disk_key.k_dir_id = dirino; key.on_disk_key.k_objectid = inode->i_ino; @@ -1439,8 +1569,9 @@ void reiserfs_read_locked_inode(struct inode *inode, reiserfs_make_bad_inode(inode); return; } + + /* a stale NFS handle can trigger this without it being an error */ if (retval != ITEM_FOUND) { - /* a stale NFS handle can trigger this without it being an error */ pathrelse(&path_to_sd); reiserfs_make_bad_inode(inode); clear_nlink(inode); @@ -1449,20 +1580,25 @@ void reiserfs_read_locked_inode(struct inode *inode, init_inode(inode, &path_to_sd); - /* It is possible that knfsd is trying to access inode of a file - that is being removed from the disk by some other thread. As we - update sd on unlink all that is required is to check for nlink - here. This bug was first found by Sizif when debugging - SquidNG/Butterfly, forgotten, and found again after Philippe - Gramoulle <philippe.gramoulle@mmania.com> reproduced it. - - More logical fix would require changes in fs/inode.c:iput() to - remove inode from hash-table _after_ fs cleaned disk stuff up and - in iget() to return NULL if I_FREEING inode is found in - hash-table. */ - /* Currently there is one place where it's ok to meet inode with - nlink==0: processing of open-unlinked and half-truncated files - during mount (fs/reiserfs/super.c:finish_unfinished()). */ + /* + * It is possible that knfsd is trying to access inode of a file + * that is being removed from the disk by some other thread. As we + * update sd on unlink all that is required is to check for nlink + * here. This bug was first found by Sizif when debugging + * SquidNG/Butterfly, forgotten, and found again after Philippe + * Gramoulle <philippe.gramoulle@mmania.com> reproduced it. + + * More logical fix would require changes in fs/inode.c:iput() to + * remove inode from hash-table _after_ fs cleaned disk stuff up and + * in iget() to return NULL if I_FREEING inode is found in + * hash-table. + */ + + /* + * Currently there is one place where it's ok to meet inode with + * nlink==0: processing of open-unlinked and half-truncated files + * during mount (fs/reiserfs/super.c:finish_unfinished()). + */ if ((inode->i_nlink == 0) && !REISERFS_SB(inode->i_sb)->s_is_unlinked_ok) { reiserfs_warning(inode->i_sb, "vs-13075", @@ -1472,7 +1608,8 @@ void reiserfs_read_locked_inode(struct inode *inode, reiserfs_make_bad_inode(inode); } - reiserfs_check_path(&path_to_sd); /* init inode should be relsing */ + /* init inode should be relsing */ + reiserfs_check_path(&path_to_sd); /* * Stat data v1 doesn't support ACLs. @@ -1481,7 +1618,7 @@ void reiserfs_read_locked_inode(struct inode *inode, cache_no_acl(inode); } -/** +/* * reiserfs_find_actor() - "find actor" reiserfs supplies to iget5_locked(). * * @inode: inode from hash table to check @@ -1556,7 +1693,8 @@ static struct dentry *reiserfs_get_dentry(struct super_block *sb, struct dentry *reiserfs_fh_to_dentry(struct super_block *sb, struct fid *fid, int fh_len, int fh_type) { - /* fhtype happens to reflect the number of u32s encoded. + /* + * fhtype happens to reflect the number of u32s encoded. * due to a bug in earlier code, fhtype might indicate there * are more u32s then actually fitted. * so if fhtype seems to be more than len, reduce fhtype. @@ -1625,13 +1763,16 @@ int reiserfs_encode_fh(struct inode *inode, __u32 * data, int *lenp, return *lenp; } -/* looks for stat data, then copies fields to it, marks the buffer - containing stat data as dirty */ -/* reiserfs inodes are never really dirty, since the dirty inode call -** always logs them. This call allows the VFS inode marking routines -** to properly mark inodes for datasync and such, but only actually -** does something when called for a synchronous update. -*/ +/* + * looks for stat data, then copies fields to it, marks the buffer + * containing stat data as dirty + */ +/* + * reiserfs inodes are never really dirty, since the dirty inode call + * always logs them. This call allows the VFS inode marking routines + * to properly mark inodes for datasync and such, but only actually + * does something when called for a synchronous update. + */ int reiserfs_write_inode(struct inode *inode, struct writeback_control *wbc) { struct reiserfs_transaction_handle th; @@ -1639,10 +1780,12 @@ int reiserfs_write_inode(struct inode *inode, struct writeback_control *wbc) if (inode->i_sb->s_flags & MS_RDONLY) return -EROFS; - /* memory pressure can sometimes initiate write_inode calls with sync == 1, - ** these cases are just when the system needs ram, not when the - ** inode needs to reach disk for safety, and they can safely be - ** ignored because the altered inode has already been logged. + /* + * memory pressure can sometimes initiate write_inode calls with + * sync == 1, + * these cases are just when the system needs ram, not when the + * inode needs to reach disk for safety, and they can safely be + * ignored because the altered inode has already been logged. */ if (wbc->sync_mode == WB_SYNC_ALL && !(current->flags & PF_MEMALLOC)) { reiserfs_write_lock(inode->i_sb); @@ -1655,8 +1798,10 @@ int reiserfs_write_inode(struct inode *inode, struct writeback_control *wbc) return 0; } -/* stat data of new object is inserted already, this inserts the item - containing "." and ".." entries */ +/* + * stat data of new object is inserted already, this inserts the item + * containing "." and ".." entries + */ static int reiserfs_new_directory(struct reiserfs_transaction_handle *th, struct inode *inode, struct item_head *ih, struct treepath *path, @@ -1674,9 +1819,11 @@ static int reiserfs_new_directory(struct reiserfs_transaction_handle *th, le32_to_cpu(ih->ih_key.k_objectid), DOT_OFFSET, TYPE_DIRENTRY, 3 /*key length */ ); - /* compose item head for new item. Directories consist of items of - old type (ITEM_VERSION_1). Do not set key (second arg is 0), it - is done by reiserfs_new_inode */ + /* + * compose item head for new item. Directories consist of items of + * old type (ITEM_VERSION_1). Do not set key (second arg is 0), it + * is done by reiserfs_new_inode + */ if (old_format_only(sb)) { make_le_item_head(ih, NULL, KEY_FORMAT_3_5, DOT_OFFSET, TYPE_DIRENTRY, EMPTY_DIR_SIZE_V1, 2); @@ -1714,9 +1861,12 @@ static int reiserfs_new_directory(struct reiserfs_transaction_handle *th, return reiserfs_insert_item(th, path, &key, ih, inode, body); } -/* stat data of object has been inserted, this inserts the item - containing the body of symlink */ -static int reiserfs_new_symlink(struct reiserfs_transaction_handle *th, struct inode *inode, /* Inode of symlink */ +/* + * stat data of object has been inserted, this inserts the item + * containing the body of symlink + */ +static int reiserfs_new_symlink(struct reiserfs_transaction_handle *th, + struct inode *inode, struct item_head *ih, struct treepath *path, const char *symname, int item_len) @@ -1754,15 +1904,26 @@ static int reiserfs_new_symlink(struct reiserfs_transaction_handle *th, struct i return reiserfs_insert_item(th, path, &key, ih, inode, symname); } -/* inserts the stat data into the tree, and then calls - reiserfs_new_directory (to insert ".", ".." item if new object is - directory) or reiserfs_new_symlink (to insert symlink body if new - object is symlink) or nothing (if new object is regular file) - - NOTE! uid and gid must already be set in the inode. If we return - non-zero due to an error, we have to drop the quota previously allocated - for the fresh inode. This can only be done outside a transaction, so - if we return non-zero, we also end the transaction. */ +/* + * inserts the stat data into the tree, and then calls + * reiserfs_new_directory (to insert ".", ".." item if new object is + * directory) or reiserfs_new_symlink (to insert symlink body if new + * object is symlink) or nothing (if new object is regular file) + + * NOTE! uid and gid must already be set in the inode. If we return + * non-zero due to an error, we have to drop the quota previously allocated + * for the fresh inode. This can only be done outside a transaction, so + * if we return non-zero, we also end the transaction. + * + * @th: active transaction handle + * @dir: parent directory for new inode + * @mode: mode of new inode + * @symname: symlink contents if inode is symlink + * @isize: 0 for regular file, EMPTY_DIR_SIZE for dirs, strlen(symname) for + * symlinks + * @inode: inode to be filled + * @security: optional security context to associate with this inode + */ int reiserfs_new_inode(struct reiserfs_transaction_handle *th, struct inode *dir, umode_t mode, const char *symname, /* 0 for regular, EMTRY_DIR_SIZE for dirs, @@ -1820,10 +1981,11 @@ int reiserfs_new_inode(struct reiserfs_transaction_handle *th, } if (old_format_only(sb)) - /* not a perfect generation count, as object ids can be reused, but - ** this is as good as reiserfs can do right now. - ** note that the private part of inode isn't filled in yet, we have - ** to use the directory. + /* + * not a perfect generation count, as object ids can be reused, + * but this is as good as reiserfs can do right now. + * note that the private part of inode isn't filled in yet, + * we have to use the directory. */ inode->i_generation = le32_to_cpu(INODE_PKEY(dir)->k_objectid); else @@ -1878,9 +2040,9 @@ int reiserfs_new_inode(struct reiserfs_transaction_handle *th, goto out_bad_inode; } if (old_format_only(sb)) { + /* i_uid or i_gid is too big to be stored in stat data v3.5 */ if (i_uid_read(inode) & ~0xffff || i_gid_read(inode) & ~0xffff) { pathrelse(&path_to_key); - /* i_uid or i_gid is too big to be stored in stat data v3.5 */ err = -EINVAL; goto out_bad_inode; } @@ -1888,9 +2050,11 @@ int reiserfs_new_inode(struct reiserfs_transaction_handle *th, } else { inode2sd(&sd, inode, inode->i_size); } - // store in in-core inode the key of stat data and version all - // object items will have (directory items will have old offset - // format, other new objects will consist of new items) + /* + * store in in-core inode the key of stat data and version all + * object items will have (directory items will have old offset + * format, other new objects will consist of new items) + */ if (old_format_only(sb) || S_ISDIR(mode) || S_ISLNK(mode)) set_inode_item_key_version(inode, KEY_FORMAT_3_5); else @@ -1975,10 +2139,6 @@ int reiserfs_new_inode(struct reiserfs_transaction_handle *th, return 0; -/* it looks like you can easily compress these two goto targets into - * one. Keeping it like this doesn't actually hurt anything, and they - * are place holders for what the quota code actually needs. - */ out_bad_inode: /* Invalidate the object, nothing was inserted yet */ INODE_PKEY(inode)->k_objectid = 0; @@ -1990,7 +2150,10 @@ int reiserfs_new_inode(struct reiserfs_transaction_handle *th, out_end_trans: journal_end(th, th->t_super, th->t_blocks_allocated); - /* Drop can be outside and it needs more credits so it's better to have it outside */ + /* + * Drop can be outside and it needs more credits so it's better + * to have it outside + */ depth = reiserfs_write_unlock_nested(inode->i_sb); dquot_drop(inode); reiserfs_write_lock_nested(inode->i_sb, depth); @@ -2006,25 +2169,26 @@ int reiserfs_new_inode(struct reiserfs_transaction_handle *th, } /* -** finds the tail page in the page cache, -** reads the last block in. -** -** On success, page_result is set to a locked, pinned page, and bh_result -** is set to an up to date buffer for the last block in the file. returns 0. -** -** tail conversion is not done, so bh_result might not be valid for writing -** check buffer_mapped(bh_result) and bh_result->b_blocknr != 0 before -** trying to write the block. -** -** on failure, nonzero is returned, page_result and bh_result are untouched. -*/ + * finds the tail page in the page cache, + * reads the last block in. + * + * On success, page_result is set to a locked, pinned page, and bh_result + * is set to an up to date buffer for the last block in the file. returns 0. + * + * tail conversion is not done, so bh_result might not be valid for writing + * check buffer_mapped(bh_result) and bh_result->b_blocknr != 0 before + * trying to write the block. + * + * on failure, nonzero is returned, page_result and bh_result are untouched. + */ static int grab_tail_page(struct inode *inode, struct page **page_result, struct buffer_head **bh_result) { - /* we want the page with the last byte in the file, - ** not the page that will hold the next byte for appending + /* + * we want the page with the last byte in the file, + * not the page that will hold the next byte for appending */ unsigned long index = (inode->i_size - 1) >> PAGE_CACHE_SHIFT; unsigned long pos = 0; @@ -2036,10 +2200,11 @@ static int grab_tail_page(struct inode *inode, struct page *page; int error; - /* we know that we are only called with inode->i_size > 0. - ** we also know that a file tail can never be as big as a block - ** If i_size % blocksize == 0, our file is currently block aligned - ** and it won't need converting or zeroing after a truncate. + /* + * we know that we are only called with inode->i_size > 0. + * we also know that a file tail can never be as big as a block + * If i_size % blocksize == 0, our file is currently block aligned + * and it won't need converting or zeroing after a truncate. */ if ((offset & (blocksize - 1)) == 0) { return -ENOENT; @@ -2068,10 +2233,11 @@ static int grab_tail_page(struct inode *inode, } while (bh != head); if (!buffer_uptodate(bh)) { - /* note, this should never happen, prepare_write should - ** be taking care of this for us. If the buffer isn't up to date, - ** I've screwed up the code to find the buffer, or the code to - ** call prepare_write + /* + * note, this should never happen, prepare_write should be + * taking care of this for us. If the buffer isn't up to + * date, I've screwed up the code to find the buffer, or the + * code to call prepare_write */ reiserfs_error(inode->i_sb, "clm-6000", "error reading block %lu", bh->b_blocknr); @@ -2091,11 +2257,11 @@ static int grab_tail_page(struct inode *inode, } /* -** vfs version of truncate file. Must NOT be called with -** a transaction already started. -** -** some code taken from block_truncate_page -*/ + * vfs version of truncate file. Must NOT be called with + * a transaction already started. + * + * some code taken from block_truncate_page + */ int reiserfs_truncate_file(struct inode *inode, int update_timestamps) { struct reiserfs_transaction_handle th; @@ -2113,9 +2279,11 @@ int reiserfs_truncate_file(struct inode *inode, int update_timestamps) if (inode->i_size > 0) { error = grab_tail_page(inode, &page, &bh); if (error) { - // -ENOENT means we truncated past the end of the file, - // and get_block_create_0 could not find a block to read in, - // which is ok. + /* + * -ENOENT means we truncated past the end of the + * file, and get_block_create_0 could not find a + * block to read in, which is ok. + */ if (error != -ENOENT) reiserfs_error(inode->i_sb, "clm-6001", "grab_tail_page failed %d", @@ -2125,25 +2293,30 @@ int reiserfs_truncate_file(struct inode *inode, int update_timestamps) } } - /* so, if page != NULL, we have a buffer head for the offset at - ** the end of the file. if the bh is mapped, and bh->b_blocknr != 0, - ** then we have an unformatted node. Otherwise, we have a direct item, - ** and no zeroing is required on disk. We zero after the truncate, - ** because the truncate might pack the item anyway - ** (it will unmap bh if it packs). + /* + * so, if page != NULL, we have a buffer head for the offset at + * the end of the file. if the bh is mapped, and bh->b_blocknr != 0, + * then we have an unformatted node. Otherwise, we have a direct item, + * and no zeroing is required on disk. We zero after the truncate, + * because the truncate might pack the item anyway + * (it will unmap bh if it packs). + * + * it is enough to reserve space in transaction for 2 balancings: + * one for "save" link adding and another for the first + * cut_from_item. 1 is for update_sd */ - /* it is enough to reserve space in transaction for 2 balancings: - one for "save" link adding and another for the first - cut_from_item. 1 is for update_sd */ error = journal_begin(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT * 2 + 1); if (error) goto out; reiserfs_update_inode_transaction(inode); if (update_timestamps) - /* we are doing real truncate: if the system crashes before the last - transaction of truncating gets committed - on reboot the file - either appears truncated properly or not truncated at all */ + /* + * we are doing real truncate: if the system crashes + * before the last transaction of truncating gets committed + * - on reboot the file either appears truncated properly + * or not truncated at all + */ add_save_link(&th, inode, 1); err2 = reiserfs_do_truncate(&th, inode, page, update_timestamps); error = @@ -2212,7 +2385,10 @@ static int map_block_for_writepage(struct inode *inode, int copy_size; int trans_running = 0; - /* catch places below that try to log something without starting a trans */ + /* + * catch places below that try to log something without + * starting a trans + */ th.t_trans_id = 0; if (!buffer_uptodate(bh_result)) { @@ -2331,7 +2507,8 @@ static int map_block_for_writepage(struct inode *inode, kunmap(bh_result->b_page); if (!retval && buffer_mapped(bh_result) && bh_result->b_blocknr == 0) { - /* we've copied data from the page into the direct item, so the + /* + * we've copied data from the page into the direct item, so the * buffer in the page is now clean, mark it to reflect that. */ lock_buffer(bh_result); @@ -2370,7 +2547,8 @@ static int reiserfs_write_full_page(struct page *page, return 0; } - /* The page dirty bit is cleared before writepage is called, which + /* + * The page dirty bit is cleared before writepage is called, which * means we have to tell create_empty_buffers to make dirty buffers * The page really should be up to date at this point, so tossing * in the BH_Uptodate is just a sanity check. @@ -2381,8 +2559,9 @@ static int reiserfs_write_full_page(struct page *page, } head = page_buffers(page); - /* last page in the file, zero out any contents past the - ** last byte in the file + /* + * last page in the file, zero out any contents past the + * last byte in the file */ if (page->index >= end_index) { unsigned last_offset; @@ -2412,7 +2591,8 @@ static int reiserfs_write_full_page(struct page *page, (!buffer_mapped(bh) || (buffer_mapped(bh) && bh->b_blocknr == 0))) { - /* not mapped yet, or it points to a direct item, search + /* + * not mapped yet, or it points to a direct item, search * the btree for the mapping info, and log any direct * items found */ @@ -2453,7 +2633,8 @@ static int reiserfs_write_full_page(struct page *page, journal_mark_dirty(&th, s, bh); continue; } - /* from this point on, we know the buffer is mapped to a + /* + * from this point on, we know the buffer is mapped to a * real block and not a direct item */ if (wbc->sync_mode != WB_SYNC_NONE) { @@ -2520,7 +2701,8 @@ static int reiserfs_write_full_page(struct page *page, return error; fail: - /* catches various errors, we need to make sure any valid dirty blocks + /* + * catches various errors, we need to make sure any valid dirty blocks * get to the media. The page is currently locked and not marked for * writeback */ @@ -2533,8 +2715,8 @@ static int reiserfs_write_full_page(struct page *page, mark_buffer_async_write(bh); } else { /* - * clear any dirty bits that might have come from getting - * attached to a dirty page + * clear any dirty bits that might have come from + * getting attached to a dirty page */ clear_buffer_dirty(bh); } @@ -2614,15 +2796,18 @@ static int reiserfs_write_begin(struct file *file, ret = __block_write_begin(page, pos, len, reiserfs_get_block); if (ret && reiserfs_transaction_running(inode->i_sb)) { struct reiserfs_transaction_handle *th = current->journal_info; - /* this gets a little ugly. If reiserfs_get_block returned an - * error and left a transacstion running, we've got to close it, - * and we've got to free handle if it was a persistent transaction. + /* + * this gets a little ugly. If reiserfs_get_block returned an + * error and left a transacstion running, we've got to close + * it, and we've got to free handle if it was a persistent + * transaction. * * But, if we had nested into an existing transaction, we need * to just drop the ref count on the handle. * * If old_ref == 0, the transaction is from reiserfs_get_block, - * and it was a persistent trans. Otherwise, it was nested above. + * and it was a persistent trans. Otherwise, it was nested + * above. */ if (th->t_refcount > old_ref) { if (old_ref) @@ -2671,15 +2856,18 @@ int __reiserfs_write_begin(struct page *page, unsigned from, unsigned len) ret = __block_write_begin(page, from, len, reiserfs_get_block); if (ret && reiserfs_transaction_running(inode->i_sb)) { struct reiserfs_transaction_handle *th = current->journal_info; - /* this gets a little ugly. If reiserfs_get_block returned an - * error and left a transacstion running, we've got to close it, - * and we've got to free handle if it was a persistent transaction. + /* + * this gets a little ugly. If reiserfs_get_block returned an + * error and left a transacstion running, we've got to close + * it, and we've got to free handle if it was a persistent + * transaction. * * But, if we had nested into an existing transaction, we need * to just drop the ref count on the handle. * * If old_ref == 0, the transaction is from reiserfs_get_block, - * and it was a persistent trans. Otherwise, it was nested above. + * and it was a persistent trans. Otherwise, it was nested + * above. */ if (th->t_refcount > old_ref) { if (old_ref) @@ -2734,17 +2922,20 @@ static int reiserfs_write_end(struct file *file, struct address_space *mapping, reiserfs_commit_page(inode, page, start, start + copied); - /* generic_commit_write does this for us, but does not update the - ** transaction tracking stuff when the size changes. So, we have - ** to do the i_size updates here. + /* + * generic_commit_write does this for us, but does not update the + * transaction tracking stuff when the size changes. So, we have + * to do the i_size updates here. */ if (pos + copied > inode->i_size) { struct reiserfs_transaction_handle myth; reiserfs_write_lock(inode->i_sb); locked = true; - /* If the file have grown beyond the border where it - can have a tail, unmark it as needing a tail - packing */ + /* + * If the file have grown beyond the border where it + * can have a tail, unmark it as needing a tail + * packing + */ if ((have_large_tails(inode->i_sb) && inode->i_size > i_block_size(inode) * 4) || (have_small_tails(inode->i_sb) @@ -2759,8 +2950,8 @@ static int reiserfs_write_end(struct file *file, struct address_space *mapping, inode->i_size = pos + copied; /* * this will just nest into our transaction. It's important - * to use mark_inode_dirty so the inode gets pushed around on the - * dirty lists, and so that O_SYNC works as expected + * to use mark_inode_dirty so the inode gets pushed around on + * the dirty lists, and so that O_SYNC works as expected */ mark_inode_dirty(inode); reiserfs_update_sd(&myth, inode); @@ -2822,15 +3013,18 @@ int reiserfs_commit_write(struct file *f, struct page *page, } reiserfs_commit_page(inode, page, from, to); - /* generic_commit_write does this for us, but does not update the - ** transaction tracking stuff when the size changes. So, we have - ** to do the i_size updates here. + /* + * generic_commit_write does this for us, but does not update the + * transaction tracking stuff when the size changes. So, we have + * to do the i_size updates here. */ if (pos > inode->i_size) { struct reiserfs_transaction_handle myth; - /* If the file have grown beyond the border where it - can have a tail, unmark it as needing a tail - packing */ + /* + * If the file have grown beyond the border where it + * can have a tail, unmark it as needing a tail + * packing + */ if ((have_large_tails(inode->i_sb) && inode->i_size > i_block_size(inode) * 4) || (have_small_tails(inode->i_sb) @@ -2845,8 +3039,8 @@ int reiserfs_commit_write(struct file *f, struct page *page, inode->i_size = pos; /* * this will just nest into our transaction. It's important - * to use mark_inode_dirty so the inode gets pushed around on the - * dirty lists, and so that O_SYNC works as expected + * to use mark_inode_dirty so the inode gets pushed around + * on the dirty lists, and so that O_SYNC works as expected */ mark_inode_dirty(inode); reiserfs_update_sd(&myth, inode); @@ -2924,9 +3118,10 @@ void i_attrs_to_sd_attrs(struct inode *inode, __u16 * sd_attrs) } } -/* decide if this buffer needs to stay around for data logging or ordered -** write purposes -*/ +/* + * decide if this buffer needs to stay around for data logging or ordered + * write purposes + */ static int invalidatepage_can_drop(struct inode *inode, struct buffer_head *bh) { int ret = 1; @@ -2937,7 +3132,8 @@ static int invalidatepage_can_drop(struct inode *inode, struct buffer_head *bh) if (!buffer_mapped(bh)) { goto free_jh; } - /* the page is locked, and the only places that log a data buffer + /* + * the page is locked, and the only places that log a data buffer * also lock the page. */ if (reiserfs_file_data_log(inode)) { @@ -2952,7 +3148,8 @@ static int invalidatepage_can_drop(struct inode *inode, struct buffer_head *bh) struct reiserfs_journal_list *jl; struct reiserfs_jh *jh = bh->b_private; - /* why is this safe? + /* + * why is this safe? * reiserfs_setattr updates i_size in the on disk * stat data before allowing vmtruncate to be called. * @@ -3080,8 +3277,10 @@ static int reiserfs_releasepage(struct page *page, gfp_t unused_gfp_flags) return ret; } -/* We thank Mingming Cao for helping us understand in great detail what - to do in this section of the code. */ +/* + * We thank Mingming Cao for helping us understand in great detail what + * to do in this section of the code. + */ static ssize_t reiserfs_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov, loff_t offset, unsigned long nr_segs) @@ -3127,8 +3326,9 @@ int reiserfs_setattr(struct dentry *dentry, struct iattr *attr) dquot_initialize(inode); reiserfs_write_lock(inode->i_sb); if (attr->ia_valid & ATTR_SIZE) { - /* version 2 items will be caught by the s_maxbytes check - ** done for us in vmtruncate + /* + * version 2 items will be caught by the s_maxbytes check + * done for us in vmtruncate */ if (get_inode_item_key_version(inode) == KEY_FORMAT_3_5 && attr->ia_size > MAX_NON_LFS) { @@ -3189,7 +3389,10 @@ int reiserfs_setattr(struct dentry *dentry, struct iattr *attr) if (error) return error; - /* (user+group)*(old+new) structure - we count quota info and , inode write (sb, inode) */ + /* + * (user+group)*(old+new) structure - we count quota + * info and , inode write (sb, inode) + */ reiserfs_write_lock(inode->i_sb); error = journal_begin(&th, inode->i_sb, jbegin_count); reiserfs_write_unlock(inode->i_sb); @@ -3203,8 +3406,10 @@ int reiserfs_setattr(struct dentry *dentry, struct iattr *attr) goto out; } - /* Update corresponding info in inode so that everything is in - * one transaction */ + /* + * Update corresponding info in inode so that everything + * is in one transaction + */ if (attr->ia_valid & ATTR_UID) inode->i_uid = attr->ia_uid; if (attr->ia_valid & ATTR_GID) diff --git a/fs/reiserfs/ioctl.c b/fs/reiserfs/ioctl.c index 946ccbf5b5a1..a4197c3240b9 100644 --- a/fs/reiserfs/ioctl.c +++ b/fs/reiserfs/ioctl.c @@ -15,7 +15,8 @@ * reiserfs_ioctl - handler for ioctl for inode * supported commands: * 1) REISERFS_IOC_UNPACK - try to unpack tail from direct item into indirect - * and prevent packing file (argument arg has to be non-zero) + * and prevent packing file (argument arg has t + * be non-zero) * 2) REISERFS_IOC_[GS]ETFLAGS, REISERFS_IOC_[GS]ETVERSION * 3) That's all for a while ... */ @@ -132,7 +133,10 @@ setversion_out: long reiserfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { - /* These are just misnamed, they actually get/put from/to user an int */ + /* + * These are just misnamed, they actually + * get/put from/to user an int + */ switch (cmd) { case REISERFS_IOC32_UNPACK: cmd = REISERFS_IOC_UNPACK; @@ -160,10 +164,10 @@ long reiserfs_compat_ioctl(struct file *file, unsigned int cmd, int reiserfs_commit_write(struct file *f, struct page *page, unsigned from, unsigned to); /* -** reiserfs_unpack -** Function try to convert tail from direct item into indirect. -** It set up nopack attribute in the REISERFS_I(inode)->nopack -*/ + * reiserfs_unpack + * Function try to convert tail from direct item into indirect. + * It set up nopack attribute in the REISERFS_I(inode)->nopack + */ int reiserfs_unpack(struct inode *inode, struct file *filp) { int retval = 0; @@ -194,9 +198,10 @@ int reiserfs_unpack(struct inode *inode, struct file *filp) goto out; } - /* we unpack by finding the page with the tail, and calling - ** __reiserfs_write_begin on that page. This will force a - ** reiserfs_get_block to unpack the tail for us. + /* + * we unpack by finding the page with the tail, and calling + * __reiserfs_write_begin on that page. This will force a + * reiserfs_get_block to unpack the tail for us. */ index = inode->i_size >> PAGE_CACHE_SHIFT; mapping = inode->i_mapping; diff --git a/fs/reiserfs/item_ops.c b/fs/reiserfs/item_ops.c index c9f136527386..cb6b826ca5e9 100644 --- a/fs/reiserfs/item_ops.c +++ b/fs/reiserfs/item_ops.c @@ -5,15 +5,17 @@ #include <linux/time.h> #include "reiserfs.h" -// this contains item handlers for old item types: sd, direct, -// indirect, directory +/* + * this contains item handlers for old item types: sd, direct, + * indirect, directory + */ -/* and where are the comments? how about saying where we can find an - explanation of each item handler method? -Hans */ +/* + * and where are the comments? how about saying where we can find an + * explanation of each item handler method? -Hans + */ -////////////////////////////////////////////////////////////////////////////// -// stat data functions -// +/* stat data functions */ static int sd_bytes_number(struct item_head *ih, int block_size) { return 0; @@ -60,7 +62,7 @@ static void sd_print_item(struct item_head *ih, char *item) static void sd_check_item(struct item_head *ih, char *item) { - // FIXME: type something here! + /* unused */ } static int sd_create_vi(struct virtual_node *vn, @@ -68,7 +70,6 @@ static int sd_create_vi(struct virtual_node *vn, int is_affected, int insert_size) { vi->vi_index = TYPE_STAT_DATA; - //vi->vi_type |= VI_TYPE_STAT_DATA;// not needed? return 0; } @@ -117,15 +118,13 @@ static struct item_operations stat_data_ops = { .print_vi = sd_print_vi }; -////////////////////////////////////////////////////////////////////////////// -// direct item functions -// +/* direct item functions */ static int direct_bytes_number(struct item_head *ih, int block_size) { return ih_item_len(ih); } -// FIXME: this should probably switch to indirect as well +/* FIXME: this should probably switch to indirect as well */ static void direct_decrement_key(struct cpu_key *key) { cpu_key_k_offset_dec(key); @@ -144,7 +143,7 @@ static void direct_print_item(struct item_head *ih, char *item) { int j = 0; -// return; +/* return; */ printk("\""); while (j < ih_item_len(ih)) printk("%c", item[j++]); @@ -153,7 +152,7 @@ static void direct_print_item(struct item_head *ih, char *item) static void direct_check_item(struct item_head *ih, char *item) { - // FIXME: type something here! + /* unused */ } static int direct_create_vi(struct virtual_node *vn, @@ -161,7 +160,6 @@ static int direct_create_vi(struct virtual_node *vn, int is_affected, int insert_size) { vi->vi_index = TYPE_DIRECT; - //vi->vi_type |= VI_TYPE_DIRECT; return 0; } @@ -211,16 +209,13 @@ static struct item_operations direct_ops = { .print_vi = direct_print_vi }; -////////////////////////////////////////////////////////////////////////////// -// indirect item functions -// - +/* indirect item functions */ static int indirect_bytes_number(struct item_head *ih, int block_size) { - return ih_item_len(ih) / UNFM_P_SIZE * block_size; //- get_ih_free_space (ih); + return ih_item_len(ih) / UNFM_P_SIZE * block_size; } -// decrease offset, if it becomes 0, change type to stat data +/* decrease offset, if it becomes 0, change type to stat data */ static void indirect_decrement_key(struct cpu_key *key) { cpu_key_k_offset_dec(key); @@ -228,7 +223,7 @@ static void indirect_decrement_key(struct cpu_key *key) set_cpu_key_k_type(key, TYPE_STAT_DATA); } -// if it is not first item of the body, then it is mergeable +/* if it is not first item of the body, then it is mergeable */ static int indirect_is_left_mergeable(struct reiserfs_key *key, unsigned long bsize) { @@ -236,7 +231,7 @@ static int indirect_is_left_mergeable(struct reiserfs_key *key, return (le_key_k_offset(version, key) != 1); } -// printing of indirect item +/* printing of indirect item */ static void start_new_sequence(__u32 * start, int *len, __u32 new) { *start = new; @@ -295,7 +290,7 @@ static void indirect_print_item(struct item_head *ih, char *item) static void indirect_check_item(struct item_head *ih, char *item) { - // FIXME: type something here! + /* unused */ } static int indirect_create_vi(struct virtual_node *vn, @@ -303,7 +298,6 @@ static int indirect_create_vi(struct virtual_node *vn, int is_affected, int insert_size) { vi->vi_index = TYPE_INDIRECT; - //vi->vi_type |= VI_TYPE_INDIRECT; return 0; } @@ -321,16 +315,19 @@ static int indirect_check_right(struct virtual_item *vi, int free) return indirect_check_left(vi, free, 0, 0); } -// return size in bytes of 'units' units. If first == 0 - calculate from the head (left), otherwise - from tail (right) +/* + * return size in bytes of 'units' units. If first == 0 - calculate + * from the head (left), otherwise - from tail (right) + */ static int indirect_part_size(struct virtual_item *vi, int first, int units) { - // unit of indirect item is byte (yet) + /* unit of indirect item is byte (yet) */ return units; } static int indirect_unit_num(struct virtual_item *vi) { - // unit of indirect item is byte (yet) + /* unit of indirect item is byte (yet) */ return vi->vi_item_len - IH_SIZE; } @@ -356,10 +353,7 @@ static struct item_operations indirect_ops = { .print_vi = indirect_print_vi }; -////////////////////////////////////////////////////////////////////////////// -// direntry functions -// - +/* direntry functions */ static int direntry_bytes_number(struct item_head *ih, int block_size) { reiserfs_warning(NULL, "vs-16090", @@ -428,7 +422,7 @@ static void direntry_check_item(struct item_head *ih, char *item) int i; struct reiserfs_de_head *deh; - // FIXME: type something here! + /* unused */ deh = (struct reiserfs_de_head *)item; for (i = 0; i < ih_entry_count(ih); i++, deh++) { ; @@ -439,7 +433,8 @@ static void direntry_check_item(struct item_head *ih, char *item) /* * function returns old entry number in directory item in real node - * using new entry number in virtual item in virtual node */ + * using new entry number in virtual item in virtual node + */ static inline int old_entry_num(int is_affected, int virtual_entry_num, int pos_in_item, int mode) { @@ -463,9 +458,11 @@ static inline int old_entry_num(int is_affected, int virtual_entry_num, return virtual_entry_num - 1; } -/* Create an array of sizes of directory entries for virtual - item. Return space used by an item. FIXME: no control over - consuming of space used by this item handler */ +/* + * Create an array of sizes of directory entries for virtual + * item. Return space used by an item. FIXME: no control over + * consuming of space used by this item handler + */ static int direntry_create_vi(struct virtual_node *vn, struct virtual_item *vi, int is_affected, int insert_size) @@ -529,10 +526,10 @@ static int direntry_create_vi(struct virtual_node *vn, } -// -// return number of entries which may fit into specified amount of -// free space, or -1 if free space is not enough even for 1 entry -// +/* + * return number of entries which may fit into specified amount of + * free space, or -1 if free space is not enough even for 1 entry + */ static int direntry_check_left(struct virtual_item *vi, int free, int start_skip, int end_skip) { @@ -541,8 +538,8 @@ static int direntry_check_left(struct virtual_item *vi, int free, struct direntry_uarea *dir_u = vi->vi_uarea; for (i = start_skip; i < dir_u->entry_count - end_skip; i++) { + /* i-th entry doesn't fit into the remaining free space */ if (dir_u->entry_sizes[i] > free) - /* i-th entry doesn't fit into the remaining free space */ break; free -= dir_u->entry_sizes[i]; @@ -570,8 +567,8 @@ static int direntry_check_right(struct virtual_item *vi, int free) struct direntry_uarea *dir_u = vi->vi_uarea; for (i = dir_u->entry_count - 1; i >= 0; i--) { + /* i-th entry doesn't fit into the remaining free space */ if (dir_u->entry_sizes[i] > free) - /* i-th entry doesn't fit into the remaining free space */ break; free -= dir_u->entry_sizes[i]; @@ -643,9 +640,7 @@ static struct item_operations direntry_ops = { .print_vi = direntry_print_vi }; -////////////////////////////////////////////////////////////////////////////// -// Error catching functions to catch errors caused by incorrect item types. -// +/* Error catching functions to catch errors caused by incorrect item types. */ static int errcatch_bytes_number(struct item_head *ih, int block_size) { reiserfs_warning(NULL, "green-16001", @@ -685,8 +680,12 @@ static int errcatch_create_vi(struct virtual_node *vn, { reiserfs_warning(NULL, "green-16006", "Invalid item type observed, run fsck ASAP"); - return 0; // We might return -1 here as well, but it won't help as create_virtual_node() from where - // this operation is called from is of return type void. + /* + * We might return -1 here as well, but it won't help as + * create_virtual_node() from where this operation is called + * from is of return type void. + */ + return 0; } static int errcatch_check_left(struct virtual_item *vi, int free, @@ -739,9 +738,6 @@ static struct item_operations errcatch_ops = { errcatch_print_vi }; -////////////////////////////////////////////////////////////////////////////// -// -// #if ! (TYPE_STAT_DATA == 0 && TYPE_INDIRECT == 1 && TYPE_DIRECT == 2 && TYPE_DIRENTRY == 3) #error Item types must use disk-format assigned values. #endif diff --git a/fs/reiserfs/journal.c b/fs/reiserfs/journal.c index 225921126455..48f03e5d16ef 100644 --- a/fs/reiserfs/journal.c +++ b/fs/reiserfs/journal.c @@ -1,38 +1,38 @@ /* -** Write ahead logging implementation copyright Chris Mason 2000 -** -** The background commits make this code very interrelated, and -** overly complex. I need to rethink things a bit....The major players: -** -** journal_begin -- call with the number of blocks you expect to log. -** If the current transaction is too -** old, it will block until the current transaction is -** finished, and then start a new one. -** Usually, your transaction will get joined in with -** previous ones for speed. -** -** journal_join -- same as journal_begin, but won't block on the current -** transaction regardless of age. Don't ever call -** this. Ever. There are only two places it should be -** called from, and they are both inside this file. -** -** journal_mark_dirty -- adds blocks into this transaction. clears any flags -** that might make them get sent to disk -** and then marks them BH_JDirty. Puts the buffer head -** into the current transaction hash. -** -** journal_end -- if the current transaction is batchable, it does nothing -** otherwise, it could do an async/synchronous commit, or -** a full flush of all log and real blocks in the -** transaction. -** -** flush_old_commits -- if the current transaction is too old, it is ended and -** commit blocks are sent to disk. Forces commit blocks -** to disk for all backgrounded commits that have been -** around too long. -** -- Note, if you call this as an immediate flush from -** from within kupdate, it will ignore the immediate flag -*/ + * Write ahead logging implementation copyright Chris Mason 2000 + * + * The background commits make this code very interrelated, and + * overly complex. I need to rethink things a bit....The major players: + * + * journal_begin -- call with the number of blocks you expect to log. + * If the current transaction is too + * old, it will block until the current transaction is + * finished, and then start a new one. + * Usually, your transaction will get joined in with + * previous ones for speed. + * + * journal_join -- same as journal_begin, but won't block on the current + * transaction regardless of age. Don't ever call + * this. Ever. There are only two places it should be + * called from, and they are both inside this file. + * + * journal_mark_dirty -- adds blocks into this transaction. clears any flags + * that might make them get sent to disk + * and then marks them BH_JDirty. Puts the buffer head + * into the current transaction hash. + * + * journal_end -- if the current transaction is batchable, it does nothing + * otherwise, it could do an async/synchronous commit, or + * a full flush of all log and real blocks in the + * transaction. + * + * flush_old_commits -- if the current transaction is too old, it is ended and + * commit blocks are sent to disk. Forces commit blocks + * to disk for all backgrounded commits that have been + * around too long. + * -- Note, if you call this as an immediate flush from + * from within kupdate, it will ignore the immediate flag + */ #include <linux/time.h> #include <linux/semaphore.h> @@ -58,16 +58,19 @@ #define JOURNAL_WORK_ENTRY(h) (list_entry((h), struct reiserfs_journal_list, \ j_working_list)) -#define JOURNAL_TRANS_HALF 1018 /* must be correct to keep the desc and commit - structs at 4k */ +/* must be correct to keep the desc and commit structs at 4k */ +#define JOURNAL_TRANS_HALF 1018 #define BUFNR 64 /*read ahead */ /* cnode stat bits. Move these into reiserfs_fs.h */ -#define BLOCK_FREED 2 /* this block was freed, and can't be written. */ -#define BLOCK_FREED_HOLDER 3 /* this block was freed during this transaction, and can't be written */ +/* this block was freed, and can't be written. */ +#define BLOCK_FREED 2 +/* this block was freed during this transaction, and can't be written */ +#define BLOCK_FREED_HOLDER 3 -#define BLOCK_NEEDS_FLUSH 4 /* used in flush_journal_list */ +/* used in flush_journal_list */ +#define BLOCK_NEEDS_FLUSH 4 #define BLOCK_DIRTIED 5 /* journal list state bits */ @@ -100,8 +103,10 @@ static void queue_log_writer(struct super_block *s); /* values for join in do_journal_begin_r */ enum { JBEGIN_REG = 0, /* regular journal begin */ - JBEGIN_JOIN = 1, /* join the running transaction if at all possible */ - JBEGIN_ABORT = 2, /* called from cleanup code, ignores aborted flag */ + /* join the running transaction if at all possible */ + JBEGIN_JOIN = 1, + /* called from cleanup code, ignores aborted flag */ + JBEGIN_ABORT = 2, }; static int do_journal_begin_r(struct reiserfs_transaction_handle *th, @@ -116,10 +121,11 @@ static void init_journal_hash(struct super_block *sb) } /* -** clears BH_Dirty and sticks the buffer on the clean list. Called because I can't allow refile_buffer to -** make schedule happen after I've freed a block. Look at remove_from_transaction and journal_mark_freed for -** more details. -*/ + * clears BH_Dirty and sticks the buffer on the clean list. Called because + * I can't allow refile_buffer to make schedule happen after I've freed a + * block. Look at remove_from_transaction and journal_mark_freed for + * more details. + */ static int reiserfs_clean_and_file_buffer(struct buffer_head *bh) { if (bh) { @@ -197,7 +203,8 @@ static void allocate_bitmap_nodes(struct super_block *sb) list_add(&bn->list, &journal->j_bitmap_nodes); journal->j_free_bitmap_nodes++; } else { - break; /* this is ok, we'll try again when more are needed */ + /* this is ok, we'll try again when more are needed */ + break; } } } @@ -232,8 +239,8 @@ static void cleanup_bitmap_list(struct super_block *sb, } /* -** only call this on FS unmount. -*/ + * only call this on FS unmount. + */ static int free_list_bitmaps(struct super_block *sb, struct reiserfs_list_bitmap *jb_array) { @@ -268,9 +275,9 @@ static int free_bitmap_nodes(struct super_block *sb) } /* -** get memory for JOURNAL_NUM_BITMAPS worth of bitmaps. -** jb_array is the array to be filled in. -*/ + * get memory for JOURNAL_NUM_BITMAPS worth of bitmaps. + * jb_array is the array to be filled in. + */ int reiserfs_allocate_list_bitmaps(struct super_block *sb, struct reiserfs_list_bitmap *jb_array, unsigned int bmap_nr) @@ -299,9 +306,9 @@ int reiserfs_allocate_list_bitmaps(struct super_block *sb, } /* -** find an available list bitmap. If you can't find one, flush a commit list -** and try again -*/ + * find an available list bitmap. If you can't find one, flush a commit list + * and try again + */ static struct reiserfs_list_bitmap *get_list_bitmap(struct super_block *sb, struct reiserfs_journal_list *jl) @@ -325,18 +332,18 @@ static struct reiserfs_list_bitmap *get_list_bitmap(struct super_block *sb, break; } } - if (jb->journal_list) { /* double check to make sure if flushed correctly */ + /* double check to make sure if flushed correctly */ + if (jb->journal_list) return NULL; - } jb->journal_list = jl; return jb; } /* -** allocates a new chunk of X nodes, and links them all together as a list. -** Uses the cnode->next and cnode->prev pointers -** returns NULL on failure -*/ + * allocates a new chunk of X nodes, and links them all together as a list. + * Uses the cnode->next and cnode->prev pointers + * returns NULL on failure + */ static struct reiserfs_journal_cnode *allocate_cnodes(int num_cnodes) { struct reiserfs_journal_cnode *head; @@ -358,9 +365,7 @@ static struct reiserfs_journal_cnode *allocate_cnodes(int num_cnodes) return head; } -/* -** pulls a cnode off the free list, or returns NULL on failure -*/ +/* pulls a cnode off the free list, or returns NULL on failure */ static struct reiserfs_journal_cnode *get_cnode(struct super_block *sb) { struct reiserfs_journal_cnode *cn; @@ -386,8 +391,8 @@ static struct reiserfs_journal_cnode *get_cnode(struct super_block *sb) } /* -** returns a cnode to the free list -*/ + * returns a cnode to the free list + */ static void free_cnode(struct super_block *sb, struct reiserfs_journal_cnode *cn) { @@ -412,7 +417,10 @@ static void clear_prepared_bits(struct buffer_head *bh) clear_buffer_journal_restore_dirty(bh); } -/* return a cnode with same dev, block number and size in table, or null if not found */ +/* + * return a cnode with same dev, block number and size in table, + * or null if not found + */ static inline struct reiserfs_journal_cnode *get_journal_hash_dev(struct super_block *sb, @@ -432,23 +440,24 @@ static inline struct reiserfs_journal_cnode *get_journal_hash_dev(struct } /* -** this actually means 'can this block be reallocated yet?'. If you set search_all, a block can only be allocated -** if it is not in the current transaction, was not freed by the current transaction, and has no chance of ever -** being overwritten by a replay after crashing. -** -** If you don't set search_all, a block can only be allocated if it is not in the current transaction. Since deleting -** a block removes it from the current transaction, this case should never happen. If you don't set search_all, make -** sure you never write the block without logging it. -** -** next_zero_bit is a suggestion about the next block to try for find_forward. -** when bl is rejected because it is set in a journal list bitmap, we search -** for the next zero bit in the bitmap that rejected bl. Then, we return that -** through next_zero_bit for find_forward to try. -** -** Just because we return something in next_zero_bit does not mean we won't -** reject it on the next call to reiserfs_in_journal -** -*/ + * this actually means 'can this block be reallocated yet?'. If you set + * search_all, a block can only be allocated if it is not in the current + * transaction, was not freed by the current transaction, and has no chance + * of ever being overwritten by a replay after crashing. + * + * If you don't set search_all, a block can only be allocated if it is not + * in the current transaction. Since deleting a block removes it from the + * current transaction, this case should never happen. If you don't set + * search_all, make sure you never write the block without logging it. + * + * next_zero_bit is a suggestion about the next block to try for find_forward. + * when bl is rejected because it is set in a journal list bitmap, we search + * for the next zero bit in the bitmap that rejected bl. Then, we return + * that through next_zero_bit for find_forward to try. + * + * Just because we return something in next_zero_bit does not mean we won't + * reject it on the next call to reiserfs_in_journal + */ int reiserfs_in_journal(struct super_block *sb, unsigned int bmap_nr, int bit_nr, int search_all, b_blocknr_t * next_zero_bit) @@ -462,9 +471,11 @@ int reiserfs_in_journal(struct super_block *sb, *next_zero_bit = 0; /* always start this at zero. */ PROC_INFO_INC(sb, journal.in_journal); - /* If we aren't doing a search_all, this is a metablock, and it will be logged before use. - ** if we crash before the transaction that freed it commits, this transaction won't - ** have committed either, and the block will never be written + /* + * If we aren't doing a search_all, this is a metablock, and it + * will be logged before use. if we crash before the transaction + * that freed it commits, this transaction won't have committed + * either, and the block will never be written */ if (search_all) { for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) { @@ -504,8 +515,7 @@ int reiserfs_in_journal(struct super_block *sb, return 0; } -/* insert cn into table -*/ +/* insert cn into table */ static inline void insert_journal_hash(struct reiserfs_journal_cnode **table, struct reiserfs_journal_cnode *cn) { @@ -551,10 +561,10 @@ static inline void put_journal_list(struct super_block *s, } /* -** this used to be much more involved, and I'm keeping it just in case things get ugly again. -** it gets called by flush_commit_list, and cleans up any data stored about blocks freed during a -** transaction. -*/ + * this used to be much more involved, and I'm keeping it just in case + * things get ugly again. it gets called by flush_commit_list, and + * cleans up any data stored about blocks freed during a transaction. + */ static void cleanup_freed_for_journal_list(struct super_block *sb, struct reiserfs_journal_list *jl) { @@ -753,7 +763,8 @@ static inline int __add_jh(struct reiserfs_journal *j, struct buffer_head *bh, get_bh(bh); jh = alloc_jh(); spin_lock(&j->j_dirty_buffers_lock); - /* buffer must be locked for __add_jh, should be able to have + /* + * buffer must be locked for __add_jh, should be able to have * two adds at the same time */ BUG_ON(bh->b_private); @@ -811,7 +822,8 @@ static int write_ordered_buffers(spinlock_t * lock, spin_lock(lock); goto loop_next; } - /* in theory, dirty non-uptodate buffers should never get here, + /* + * in theory, dirty non-uptodate buffers should never get here, * but the upper layer io error paths still have a few quirks. * Handle them here as gracefully as we can */ @@ -849,13 +861,14 @@ static int write_ordered_buffers(spinlock_t * lock, if (!buffer_uptodate(bh)) { ret = -EIO; } - /* ugly interaction with invalidatepage here. - * reiserfs_invalidate_page will pin any buffer that has a valid - * journal head from an older transaction. If someone else sets - * our buffer dirty after we write it in the first loop, and - * then someone truncates the page away, nobody will ever write - * the buffer. We're safe if we write the page one last time - * after freeing the journal header. + /* + * ugly interaction with invalidatepage here. + * reiserfs_invalidate_page will pin any buffer that has a + * valid journal head from an older transaction. If someone + * else sets our buffer dirty after we write it in the first + * loop, and then someone truncates the page away, nobody + * will ever write the buffer. We're safe if we write the + * page one last time after freeing the journal header. */ if (buffer_dirty(bh) && unlikely(bh->b_page->mapping == NULL)) { spin_unlock(lock); @@ -916,9 +929,11 @@ static int flush_older_commits(struct super_block *s, if (!journal_list_still_alive(s, trans_id)) return 1; - /* the one we just flushed is gone, this means all - * older lists are also gone, so first_jl is no longer - * valid either. Go back to the beginning. + /* + * the one we just flushed is gone, this means + * all older lists are also gone, so first_jl + * is no longer valid either. Go back to the + * beginning. */ if (!journal_list_still_alive (s, other_trans_id)) { @@ -951,12 +966,12 @@ static int reiserfs_async_progress_wait(struct super_block *s) } /* -** if this journal list still has commit blocks unflushed, send them to disk. -** -** log areas must be flushed in order (transaction 2 can't commit before transaction 1) -** Before the commit block can by written, every other log block must be safely on disk -** -*/ + * if this journal list still has commit blocks unflushed, send them to disk. + * + * log areas must be flushed in order (transaction 2 can't commit before + * transaction 1) Before the commit block can by written, every other log + * block must be safely on disk + */ static int flush_commit_list(struct super_block *s, struct reiserfs_journal_list *jl, int flushall) { @@ -975,8 +990,9 @@ static int flush_commit_list(struct super_block *s, return 0; } - /* before we can put our commit blocks on disk, we have to make sure everyone older than - ** us is on disk too + /* + * before we can put our commit blocks on disk, we have to make + * sure everyone older than us is on disk too */ BUG_ON(jl->j_len <= 0); BUG_ON(trans_id == journal->j_trans_id); @@ -984,7 +1000,10 @@ static int flush_commit_list(struct super_block *s, get_journal_list(jl); if (flushall) { if (flush_older_commits(s, jl) == 1) { - /* list disappeared during flush_older_commits. return */ + /* + * list disappeared during flush_older_commits. + * return + */ goto put_jl; } } @@ -1056,9 +1075,10 @@ static int flush_commit_list(struct super_block *s, depth = reiserfs_write_unlock_nested(s); __wait_on_buffer(tbh); reiserfs_write_lock_nested(s, depth); - // since we're using ll_rw_blk above, it might have skipped over - // a locked buffer. Double check here - // + /* + * since we're using ll_rw_blk above, it might have skipped + * over a locked buffer. Double check here + */ /* redundant, sync_dirty_buffer() checks */ if (buffer_dirty(tbh)) { depth = reiserfs_write_unlock_nested(s); @@ -1072,17 +1092,21 @@ static int flush_commit_list(struct super_block *s, #endif retval = -EIO; } - put_bh(tbh); /* once for journal_find_get_block */ - put_bh(tbh); /* once due to original getblk in do_journal_end */ + /* once for journal_find_get_block */ + put_bh(tbh); + /* once due to original getblk in do_journal_end */ + put_bh(tbh); atomic_dec(&(jl->j_commit_left)); } BUG_ON(atomic_read(&(jl->j_commit_left)) != 1); - /* If there was a write error in the journal - we can't commit + /* + * If there was a write error in the journal - we can't commit * this transaction - it will be invalid and, if successful, * will just end up propagating the write error out to - * the file system. */ + * the file system. + */ if (likely(!retval && !reiserfs_is_journal_aborted (journal))) { if (buffer_dirty(jl->j_commit_bh)) BUG(); @@ -1095,9 +1119,11 @@ static int flush_commit_list(struct super_block *s, reiserfs_write_lock_nested(s, depth); } - /* If there was a write error in the journal - we can't commit this + /* + * If there was a write error in the journal - we can't commit this * transaction - it will be invalid and, if successful, will just end - * up propagating the write error out to the filesystem. */ + * up propagating the write error out to the filesystem. + */ if (unlikely(!buffer_uptodate(jl->j_commit_bh))) { #ifdef CONFIG_REISERFS_CHECK reiserfs_warning(s, "journal-615", "buffer write failed"); @@ -1112,7 +1138,10 @@ static int flush_commit_list(struct super_block *s, } journal->j_last_commit_id = jl->j_trans_id; - /* now, every commit block is on the disk. It is safe to allow blocks freed during this transaction to be reallocated */ + /* + * now, every commit block is on the disk. It is safe to allow + * blocks freed during this transaction to be reallocated + */ cleanup_freed_for_journal_list(s, jl); retval = retval ? retval : journal->j_errno; @@ -1136,9 +1165,9 @@ static int flush_commit_list(struct super_block *s, } /* -** flush_journal_list frequently needs to find a newer transaction for a given block. This does that, or -** returns NULL if it can't find anything -*/ + * flush_journal_list frequently needs to find a newer transaction for a + * given block. This does that, or returns NULL if it can't find anything + */ static struct reiserfs_journal_list *find_newer_jl_for_cn(struct reiserfs_journal_cnode *cn) @@ -1162,10 +1191,11 @@ static void remove_journal_hash(struct super_block *, int); /* -** once all the real blocks have been flushed, it is safe to remove them from the -** journal list for this transaction. Aside from freeing the cnode, this also allows the -** block to be reallocated for data blocks if it had been deleted. -*/ + * once all the real blocks have been flushed, it is safe to remove them + * from the journal list for this transaction. Aside from freeing the + * cnode, this also allows the block to be reallocated for data blocks + * if it had been deleted. + */ static void remove_all_from_journal_list(struct super_block *sb, struct reiserfs_journal_list *jl, int debug) @@ -1174,8 +1204,9 @@ static void remove_all_from_journal_list(struct super_block *sb, struct reiserfs_journal_cnode *cn, *last; cn = jl->j_realblock; - /* which is better, to lock once around the whole loop, or - ** to lock for each call to remove_journal_hash? + /* + * which is better, to lock once around the whole loop, or + * to lock for each call to remove_journal_hash? */ while (cn) { if (cn->blocknr != 0) { @@ -1197,12 +1228,13 @@ static void remove_all_from_journal_list(struct super_block *sb, } /* -** if this timestamp is greater than the timestamp we wrote last to the header block, write it to the header block. -** once this is done, I can safely say the log area for this transaction won't ever be replayed, and I can start -** releasing blocks in this transaction for reuse as data blocks. -** called by flush_journal_list, before it calls remove_all_from_journal_list -** -*/ + * if this timestamp is greater than the timestamp we wrote last to the + * header block, write it to the header block. once this is done, I can + * safely say the log area for this transaction won't ever be replayed, + * and I can start releasing blocks in this transaction for reuse as data + * blocks. called by flush_journal_list, before it calls + * remove_all_from_journal_list + */ static int _update_journal_header_block(struct super_block *sb, unsigned long offset, unsigned int trans_id) @@ -1272,7 +1304,8 @@ static int flush_older_journal_lists(struct super_block *sb, struct reiserfs_journal *journal = SB_JOURNAL(sb); unsigned int trans_id = jl->j_trans_id; - /* we know we are the only ones flushing things, no extra race + /* + * we know we are the only ones flushing things, no extra race * protection is required. */ restart: @@ -1302,15 +1335,16 @@ static void del_from_work_list(struct super_block *s, } } -/* flush a journal list, both commit and real blocks -** -** always set flushall to 1, unless you are calling from inside -** flush_journal_list -** -** IMPORTANT. This can only be called while there are no journal writers, -** and the journal is locked. That means it can only be called from -** do_journal_end, or by journal_release -*/ +/* + * flush a journal list, both commit and real blocks + * + * always set flushall to 1, unless you are calling from inside + * flush_journal_list + * + * IMPORTANT. This can only be called while there are no journal writers, + * and the journal is locked. That means it can only be called from + * do_journal_end, or by journal_release + */ static int flush_journal_list(struct super_block *s, struct reiserfs_journal_list *jl, int flushall) { @@ -1352,8 +1386,9 @@ static int flush_journal_list(struct super_block *s, goto flush_older_and_return; } - /* start by putting the commit list on disk. This will also flush - ** the commit lists of any olders transactions + /* + * start by putting the commit list on disk. This will also flush + * the commit lists of any olders transactions */ flush_commit_list(s, jl, 1); @@ -1367,8 +1402,9 @@ static int flush_journal_list(struct super_block *s, goto flush_older_and_return; } - /* loop through each cnode, see if we need to write it, - ** or wait on a more recent transaction, or just ignore it + /* + * loop through each cnode, see if we need to write it, + * or wait on a more recent transaction, or just ignore it */ if (atomic_read(&(journal->j_wcount)) != 0) { reiserfs_panic(s, "journal-844", "journal list is flushing, " @@ -1384,20 +1420,25 @@ static int flush_journal_list(struct super_block *s, goto free_cnode; } - /* This transaction failed commit. Don't write out to the disk */ + /* + * This transaction failed commit. + * Don't write out to the disk + */ if (!(jl->j_state & LIST_DIRTY)) goto free_cnode; pjl = find_newer_jl_for_cn(cn); - /* the order is important here. We check pjl to make sure we - ** don't clear BH_JDirty_wait if we aren't the one writing this - ** block to disk + /* + * the order is important here. We check pjl to make sure we + * don't clear BH_JDirty_wait if we aren't the one writing this + * block to disk */ if (!pjl && cn->bh) { saved_bh = cn->bh; - /* we do this to make sure nobody releases the buffer while - ** we are working with it + /* + * we do this to make sure nobody releases the + * buffer while we are working with it */ get_bh(saved_bh); @@ -1406,13 +1447,17 @@ static int flush_journal_list(struct super_block *s, was_jwait = 1; was_dirty = 1; } else if (can_dirty(cn)) { - /* everything with !pjl && jwait should be writable */ + /* + * everything with !pjl && jwait + * should be writable + */ BUG(); } } - /* if someone has this block in a newer transaction, just make - ** sure they are committed, and don't try writing it to disk + /* + * if someone has this block in a newer transaction, just make + * sure they are committed, and don't try writing it to disk */ if (pjl) { if (atomic_read(&pjl->j_commit_left)) @@ -1420,16 +1465,18 @@ static int flush_journal_list(struct super_block *s, goto free_cnode; } - /* bh == NULL when the block got to disk on its own, OR, - ** the block got freed in a future transaction + /* + * bh == NULL when the block got to disk on its own, OR, + * the block got freed in a future transaction */ if (saved_bh == NULL) { goto free_cnode; } - /* this should never happen. kupdate_one_transaction has this list - ** locked while it works, so we should never see a buffer here that - ** is not marked JDirty_wait + /* + * this should never happen. kupdate_one_transaction has + * this list locked while it works, so we should never see a + * buffer here that is not marked JDirty_wait */ if ((!was_jwait) && !buffer_locked(saved_bh)) { reiserfs_warning(s, "journal-813", @@ -1440,7 +1487,10 @@ static int flush_journal_list(struct super_block *s, was_jwait ? ' ' : '!'); } if (was_dirty) { - /* we inc again because saved_bh gets decremented at free_cnode */ + /* + * we inc again because saved_bh gets decremented + * at free_cnode + */ get_bh(saved_bh); set_bit(BLOCK_NEEDS_FLUSH, &cn->state); lock_buffer(saved_bh); @@ -1460,7 +1510,10 @@ static int flush_journal_list(struct super_block *s, last = cn; cn = cn->next; if (saved_bh) { - /* we incremented this to keep others from taking the buffer head away */ + /* + * we incremented this to keep others from + * taking the buffer head away + */ put_bh(saved_bh); if (atomic_read(&(saved_bh->b_count)) < 0) { reiserfs_warning(s, "journal-945", @@ -1492,8 +1545,10 @@ static int flush_journal_list(struct super_block *s, #endif err = -EIO; } - /* note, we must clear the JDirty_wait bit after the up to date - ** check, otherwise we race against our flushpage routine + /* + * note, we must clear the JDirty_wait bit + * after the up to date check, otherwise we + * race against our flushpage routine */ BUG_ON(!test_clear_buffer_journal_dirty (cn->bh)); @@ -1513,23 +1568,25 @@ static int flush_journal_list(struct super_block *s, __func__); flush_older_and_return: - /* before we can update the journal header block, we _must_ flush all - ** real blocks from all older transactions to disk. This is because - ** once the header block is updated, this transaction will not be - ** replayed after a crash + /* + * before we can update the journal header block, we _must_ flush all + * real blocks from all older transactions to disk. This is because + * once the header block is updated, this transaction will not be + * replayed after a crash */ if (flushall) { flush_older_journal_lists(s, jl); } err = journal->j_errno; - /* before we can remove everything from the hash tables for this - ** transaction, we must make sure it can never be replayed - ** - ** since we are only called from do_journal_end, we know for sure there - ** are no allocations going on while we are flushing journal lists. So, - ** we only need to update the journal header block for the last list - ** being flushed + /* + * before we can remove everything from the hash tables for this + * transaction, we must make sure it can never be replayed + * + * since we are only called from do_journal_end, we know for sure there + * are no allocations going on while we are flushing journal lists. So, + * we only need to update the journal header block for the last list + * being flushed */ if (!err && flushall) { err = @@ -1554,7 +1611,8 @@ static int flush_journal_list(struct super_block *s, } journal->j_last_flush_id = jl->j_trans_id; - /* not strictly required since we are freeing the list, but it should + /* + * not strictly required since we are freeing the list, but it should * help find code using dead lists later on */ jl->j_len = 0; @@ -1585,15 +1643,17 @@ static int write_one_transaction(struct super_block *s, cn = jl->j_realblock; while (cn) { - /* if the blocknr == 0, this has been cleared from the hash, - ** skip it + /* + * if the blocknr == 0, this has been cleared from the hash, + * skip it */ if (cn->blocknr == 0) { goto next; } if (cn->bh && can_dirty(cn) && buffer_dirty(cn->bh)) { struct buffer_head *tmp_bh; - /* we can race against journal_mark_freed when we try + /* + * we can race against journal_mark_freed when we try * to lock_buffer(cn->bh), so we have to inc the buffer * count, and recheck things after locking */ @@ -1630,15 +1690,17 @@ static int dirty_one_transaction(struct super_block *s, jl->j_state |= LIST_DIRTY; cn = jl->j_realblock; while (cn) { - /* look for a more recent transaction that logged this - ** buffer. Only the most recent transaction with a buffer in - ** it is allowed to send that buffer to disk + /* + * look for a more recent transaction that logged this + * buffer. Only the most recent transaction with a buffer in + * it is allowed to send that buffer to disk */ pjl = find_newer_jl_for_cn(cn); if (!pjl && cn->blocknr && cn->bh && buffer_journal_dirty(cn->bh)) { BUG_ON(!can_dirty(cn)); - /* if the buffer is prepared, it will either be logged + /* + * if the buffer is prepared, it will either be logged * or restored. If restored, we need to make sure * it actually gets marked dirty */ @@ -1675,7 +1737,8 @@ static int kupdate_transactions(struct super_block *s, goto done; } - /* we've got j_flush_mutex held, nobody is going to delete any + /* + * we've got j_flush_mutex held, nobody is going to delete any * of these lists out from underneath us */ while ((num_trans && transactions_flushed < num_trans) || @@ -1714,15 +1777,16 @@ static int kupdate_transactions(struct super_block *s, return ret; } -/* for o_sync and fsync heavy applications, they tend to use -** all the journa list slots with tiny transactions. These -** trigger lots and lots of calls to update the header block, which -** adds seeks and slows things down. -** -** This function tries to clear out a large chunk of the journal lists -** at once, which makes everything faster since only the newest journal -** list updates the header block -*/ +/* + * for o_sync and fsync heavy applications, they tend to use + * all the journa list slots with tiny transactions. These + * trigger lots and lots of calls to update the header block, which + * adds seeks and slows things down. + * + * This function tries to clear out a large chunk of the journal lists + * at once, which makes everything faster since only the newest journal + * list updates the header block + */ static int flush_used_journal_lists(struct super_block *s, struct reiserfs_journal_list *jl) { @@ -1759,9 +1823,11 @@ static int flush_used_journal_lists(struct super_block *s, } get_journal_list(jl); get_journal_list(flush_jl); - /* try to find a group of blocks we can flush across all the - ** transactions, but only bother if we've actually spanned - ** across multiple lists + + /* + * try to find a group of blocks we can flush across all the + * transactions, but only bother if we've actually spanned + * across multiple lists */ if (flush_jl != jl) { ret = kupdate_transactions(s, jl, &tjl, &trans_id, len, i); @@ -1773,9 +1839,9 @@ static int flush_used_journal_lists(struct super_block *s, } /* -** removes any nodes in table with name block and dev as bh. -** only touchs the hnext and hprev pointers. -*/ + * removes any nodes in table with name block and dev as bh. + * only touchs the hnext and hprev pointers. + */ void remove_journal_hash(struct super_block *sb, struct reiserfs_journal_cnode **table, struct reiserfs_journal_list *jl, @@ -1804,7 +1870,11 @@ void remove_journal_hash(struct super_block *sb, cur->blocknr = 0; cur->sb = NULL; cur->state = 0; - if (cur->bh && cur->jlist) /* anybody who clears the cur->bh will also dec the nonzerolen */ + /* + * anybody who clears the cur->bh will also + * dec the nonzerolen + */ + if (cur->bh && cur->jlist) atomic_dec(&(cur->jlist->j_nonzerolen)); cur->bh = NULL; cur->jlist = NULL; @@ -1825,17 +1895,18 @@ static void free_journal_ram(struct super_block *sb) if (journal->j_header_bh) { brelse(journal->j_header_bh); } - /* j_header_bh is on the journal dev, make sure not to release the journal - * dev until we brelse j_header_bh + /* + * j_header_bh is on the journal dev, make sure + * not to release the journal dev until we brelse j_header_bh */ release_journal_dev(sb, journal); vfree(journal); } /* -** call on unmount. Only set error to 1 if you haven't made your way out -** of read_super() yet. Any other caller must keep error at 0. -*/ + * call on unmount. Only set error to 1 if you haven't made your way out + * of read_super() yet. Any other caller must keep error at 0. + */ static int do_journal_release(struct reiserfs_transaction_handle *th, struct super_block *sb, int error) { @@ -1843,14 +1914,19 @@ static int do_journal_release(struct reiserfs_transaction_handle *th, int flushed = 0; struct reiserfs_journal *journal = SB_JOURNAL(sb); - /* we only want to flush out transactions if we were called with error == 0 + /* + * we only want to flush out transactions if we were + * called with error == 0 */ if (!error && !(sb->s_flags & MS_RDONLY)) { /* end the current trans */ BUG_ON(!th->t_trans_id); do_journal_end(th, sb, 10, FLUSH_ALL); - /* make sure something gets logged to force our way into the flush code */ + /* + * make sure something gets logged to force + * our way into the flush code + */ if (!journal_join(&myth, sb, 1)) { reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb), @@ -1894,25 +1970,24 @@ static int do_journal_release(struct reiserfs_transaction_handle *th, return 0; } -/* -** call on unmount. flush all journal trans, release all alloc'd ram -*/ +/* * call on unmount. flush all journal trans, release all alloc'd ram */ int journal_release(struct reiserfs_transaction_handle *th, struct super_block *sb) { return do_journal_release(th, sb, 0); } -/* -** only call from an error condition inside reiserfs_read_super! -*/ +/* only call from an error condition inside reiserfs_read_super! */ int journal_release_error(struct reiserfs_transaction_handle *th, struct super_block *sb) { return do_journal_release(th, sb, 1); } -/* compares description block with commit block. returns 1 if they differ, 0 if they are the same */ +/* + * compares description block with commit block. + * returns 1 if they differ, 0 if they are the same + */ static int journal_compare_desc_commit(struct super_block *sb, struct reiserfs_journal_desc *desc, struct reiserfs_journal_commit *commit) @@ -1926,11 +2001,12 @@ static int journal_compare_desc_commit(struct super_block *sb, return 0; } -/* returns 0 if it did not find a description block -** returns -1 if it found a corrupt commit block -** returns 1 if both desc and commit were valid -** NOTE: only called during fs mount -*/ +/* + * returns 0 if it did not find a description block + * returns -1 if it found a corrupt commit block + * returns 1 if both desc and commit were valid + * NOTE: only called during fs mount + */ static int journal_transaction_is_valid(struct super_block *sb, struct buffer_head *d_bh, unsigned int *oldest_invalid_trans_id, @@ -1976,7 +2052,10 @@ static int journal_transaction_is_valid(struct super_block *sb, } offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb); - /* ok, we have a journal description block, lets see if the transaction was valid */ + /* + * ok, we have a journal description block, + * let's see if the transaction was valid + */ c_bh = journal_bread(sb, SB_ONDISK_JOURNAL_1st_BLOCK(sb) + @@ -2028,11 +2107,11 @@ static void brelse_array(struct buffer_head **heads, int num) } /* -** given the start, and values for the oldest acceptable transactions, -** this either reads in a replays a transaction, or returns because the -** transaction is invalid, or too old. -** NOTE: only called during fs mount -*/ + * given the start, and values for the oldest acceptable transactions, + * this either reads in a replays a transaction, or returns because the + * transaction is invalid, or too old. + * NOTE: only called during fs mount + */ static int journal_read_transaction(struct super_block *sb, unsigned long cur_dblock, unsigned long oldest_start, @@ -2106,7 +2185,10 @@ static int journal_read_transaction(struct super_block *sb, } trans_id = get_desc_trans_id(desc); - /* now we know we've got a good transaction, and it was inside the valid time ranges */ + /* + * now we know we've got a good transaction, and it was + * inside the valid time ranges + */ log_blocks = kmalloc(get_desc_trans_len(desc) * sizeof(struct buffer_head *), GFP_NOFS); real_blocks = kmalloc(get_desc_trans_len(desc) * @@ -2213,7 +2295,10 @@ static int journal_read_transaction(struct super_block *sb, "journal-1095: setting journal " "start to offset %ld", cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb)); - /* init starting values for the first transaction, in case this is the last transaction to be replayed. */ + /* + * init starting values for the first transaction, in case + * this is the last transaction to be replayed. + */ journal->j_start = cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb); journal->j_last_flush_trans_id = trans_id; journal->j_trans_id = trans_id + 1; @@ -2227,12 +2312,14 @@ static int journal_read_transaction(struct super_block *sb, return 0; } -/* This function reads blocks starting from block and to max_block of bufsize - size (but no more than BUFNR blocks at a time). This proved to improve - mounting speed on self-rebuilding raid5 arrays at least. - Right now it is only used from journal code. But later we might use it - from other places. - Note: Do not use journal_getblk/sb_getblk functions here! */ +/* + * This function reads blocks starting from block and to max_block of bufsize + * size (but no more than BUFNR blocks at a time). This proved to improve + * mounting speed on self-rebuilding raid5 arrays at least. + * Right now it is only used from journal code. But later we might use it + * from other places. + * Note: Do not use journal_getblk/sb_getblk functions here! + */ static struct buffer_head *reiserfs_breada(struct block_device *dev, b_blocknr_t block, int bufsize, b_blocknr_t max_block) @@ -2271,15 +2358,17 @@ static struct buffer_head *reiserfs_breada(struct block_device *dev, } /* -** read and replay the log -** on a clean unmount, the journal header's next unflushed pointer will -** be to an invalid transaction. This tests that before finding all the -** transactions in the log, which makes normal mount times fast. -** After a crash, this starts with the next unflushed transaction, and -** replays until it finds one too old, or invalid. -** On exit, it sets things up so the first transaction will work correctly. -** NOTE: only called during fs mount -*/ + * read and replay the log + * on a clean unmount, the journal header's next unflushed pointer will be + * to an invalid transaction. This tests that before finding all the + * transactions in the log, which makes normal mount times fast. + * + * After a crash, this starts with the next unflushed transaction, and + * replays until it finds one too old, or invalid. + * + * On exit, it sets things up so the first transaction will work correctly. + * NOTE: only called during fs mount + */ static int journal_read(struct super_block *sb) { struct reiserfs_journal *journal = SB_JOURNAL(sb); @@ -2303,9 +2392,10 @@ static int journal_read(struct super_block *sb) bdevname(journal->j_dev_bd, b)); start = get_seconds(); - /* step 1, read in the journal header block. Check the transaction it says - ** is the first unflushed, and if that transaction is not valid, - ** replay is done + /* + * step 1, read in the journal header block. Check the transaction + * it says is the first unflushed, and if that transaction is not + * valid, replay is done */ journal->j_header_bh = journal_bread(sb, SB_ONDISK_JOURNAL_1st_BLOCK(sb) @@ -2329,9 +2419,10 @@ static int journal_read(struct super_block *sb) le32_to_cpu(jh->j_last_flush_trans_id)); valid_journal_header = 1; - /* now, we try to read the first unflushed offset. If it is not valid, - ** there is nothing more we can do, and it makes no sense to read - ** through the whole log. + /* + * now, we try to read the first unflushed offset. If it + * is not valid, there is nothing more we can do, and it + * makes no sense to read through the whole log. */ d_bh = journal_bread(sb, @@ -2345,15 +2436,19 @@ static int journal_read(struct super_block *sb) goto start_log_replay; } - /* ok, there are transactions that need to be replayed. start with the first log block, find - ** all the valid transactions, and pick out the oldest. + /* + * ok, there are transactions that need to be replayed. start + * with the first log block, find all the valid transactions, and + * pick out the oldest. */ while (continue_replay && cur_dblock < (SB_ONDISK_JOURNAL_1st_BLOCK(sb) + SB_ONDISK_JOURNAL_SIZE(sb))) { - /* Note that it is required for blocksize of primary fs device and journal - device to be the same */ + /* + * Note that it is required for blocksize of primary fs + * device and journal device to be the same + */ d_bh = reiserfs_breada(journal->j_dev_bd, cur_dblock, sb->s_blocksize, @@ -2431,9 +2526,11 @@ static int journal_read(struct super_block *sb) reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1225: No valid " "transactions found"); } - /* j_start does not get set correctly if we don't replay any transactions. - ** if we had a valid journal_header, set j_start to the first unflushed transaction value, - ** copy the trans_id from the header + /* + * j_start does not get set correctly if we don't replay any + * transactions. if we had a valid journal_header, set j_start + * to the first unflushed transaction value, copy the trans_id + * from the header */ if (valid_journal_header && replay_count == 0) { journal->j_start = le32_to_cpu(jh->j_first_unflushed_offset); @@ -2462,8 +2559,9 @@ static int journal_read(struct super_block *sb) _update_journal_header_block(sb, journal->j_start, journal->j_last_flush_trans_id)) { reiserfs_write_unlock(sb); - /* replay failed, caller must call free_journal_ram and abort - ** the mount + /* + * replay failed, caller must call free_journal_ram and abort + * the mount */ return -1; } @@ -2556,7 +2654,7 @@ static int journal_init_dev(struct super_block *super, return 0; } -/** +/* * When creating/tuning a file system user can assign some * journal params within boundaries which depend on the ratio * blocksize/standard_blocksize. @@ -2574,8 +2672,7 @@ static int check_advise_trans_params(struct super_block *sb, struct reiserfs_journal *journal) { if (journal->j_trans_max) { - /* Non-default journal params. - Do sanity check for them. */ + /* Non-default journal params. Do sanity check for them. */ int ratio = 1; if (sb->s_blocksize < REISERFS_STANDARD_BLKSIZE) ratio = REISERFS_STANDARD_BLKSIZE / sb->s_blocksize; @@ -2597,10 +2694,12 @@ static int check_advise_trans_params(struct super_block *sb, return 1; } } else { - /* Default journal params. - The file system was created by old version - of mkreiserfs, so some fields contain zeros, - and we need to advise proper values for them */ + /* + * Default journal params. + * The file system was created by old version + * of mkreiserfs, so some fields contain zeros, + * and we need to advise proper values for them + */ if (sb->s_blocksize != REISERFS_STANDARD_BLKSIZE) { reiserfs_warning(sb, "sh-464", "bad blocksize (%u)", sb->s_blocksize); @@ -2613,9 +2712,7 @@ static int check_advise_trans_params(struct super_block *sb, return 0; } -/* -** must be called once on fs mount. calls journal_read for you -*/ +/* must be called once on fs mount. calls journal_read for you */ int journal_init(struct super_block *sb, const char *j_dev_name, int old_format, unsigned int commit_max_age) { @@ -2654,8 +2751,10 @@ int journal_init(struct super_block *sb, const char *j_dev_name, REISERFS_DISK_OFFSET_IN_BYTES / sb->s_blocksize + 2); - /* Sanity check to see is the standard journal fitting within first bitmap - (actual for small blocksizes) */ + /* + * Sanity check to see is the standard journal fitting + * within first bitmap (actual for small blocksizes) + */ if (!SB_ONDISK_JOURNAL_DEVICE(sb) && (SB_JOURNAL_1st_RESERVED_BLOCK(sb) + SB_ONDISK_JOURNAL_SIZE(sb) > sb->s_blocksize * 8)) { @@ -2803,10 +2902,10 @@ int journal_init(struct super_block *sb, const char *j_dev_name, } /* -** test for a polite end of the current transaction. Used by file_write, and should -** be used by delete to make sure they don't write more than can fit inside a single -** transaction -*/ + * test for a polite end of the current transaction. Used by file_write, + * and should be used by delete to make sure they don't write more than + * can fit inside a single transaction + */ int journal_transaction_should_end(struct reiserfs_transaction_handle *th, int new_alloc) { @@ -2829,8 +2928,7 @@ int journal_transaction_should_end(struct reiserfs_transaction_handle *th, return 0; } -/* this must be called inside a transaction -*/ +/* this must be called inside a transaction */ void reiserfs_block_writes(struct reiserfs_transaction_handle *th) { struct reiserfs_journal *journal = SB_JOURNAL(th->t_super); @@ -2840,8 +2938,7 @@ void reiserfs_block_writes(struct reiserfs_transaction_handle *th) return; } -/* this must be called without a transaction started -*/ +/* this must be called without a transaction started */ void reiserfs_allow_writes(struct super_block *s) { struct reiserfs_journal *journal = SB_JOURNAL(s); @@ -2849,8 +2946,7 @@ void reiserfs_allow_writes(struct super_block *s) wake_up(&journal->j_join_wait); } -/* this must be called without a transaction started -*/ +/* this must be called without a transaction started */ void reiserfs_wait_on_write_block(struct super_block *s) { struct reiserfs_journal *journal = SB_JOURNAL(s); @@ -2912,11 +3008,12 @@ static void let_transaction_grow(struct super_block *sb, unsigned int trans_id) } } -/* join == true if you must join an existing transaction. -** join == false if you can deal with waiting for others to finish -** -** this will block until the transaction is joinable. send the number of blocks you -** expect to use in nblocks. +/* + * join == true if you must join an existing transaction. + * join == false if you can deal with waiting for others to finish + * + * this will block until the transaction is joinable. send the number of + * blocks you expect to use in nblocks. */ static int do_journal_begin_r(struct reiserfs_transaction_handle *th, struct super_block *sb, unsigned long nblocks, @@ -2957,9 +3054,11 @@ static int do_journal_begin_r(struct reiserfs_transaction_handle *th, } now = get_seconds(); - /* if there is no room in the journal OR - ** if this transaction is too old, and we weren't called joinable, wait for it to finish before beginning - ** we don't sleep if there aren't other writers + /* + * if there is no room in the journal OR + * if this transaction is too old, and we weren't called joinable, + * wait for it to finish before beginning we don't sleep if there + * aren't other writers */ if ((!join && journal->j_must_wait > 0) || @@ -2973,7 +3072,8 @@ static int do_journal_begin_r(struct reiserfs_transaction_handle *th, || (!join && journal->j_cnode_free < (journal->j_trans_max * 3))) { old_trans_id = journal->j_trans_id; - unlock_journal(sb); /* allow others to finish this transaction */ + /* allow others to finish this transaction */ + unlock_journal(sb); if (!join && (journal->j_len_alloc + nblocks + 2) >= journal->j_max_batch && @@ -2985,8 +3085,9 @@ static int do_journal_begin_r(struct reiserfs_transaction_handle *th, goto relock; } } - /* don't mess with joining the transaction if all we have to do is - * wait for someone else to do a commit + /* + * don't mess with joining the transaction if all we + * have to do is wait for someone else to do a commit */ if (atomic_read(&journal->j_jlock)) { while (journal->j_trans_id == old_trans_id && @@ -3027,9 +3128,11 @@ static int do_journal_begin_r(struct reiserfs_transaction_handle *th, out_fail: memset(th, 0, sizeof(*th)); - /* Re-set th->t_super, so we can properly keep track of how many + /* + * Re-set th->t_super, so we can properly keep track of how many * persistent transactions there are. We need to do this so if this - * call is part of a failed restart_transaction, we can free it later */ + * call is part of a failed restart_transaction, we can free it later + */ th->t_super = sb; return retval; } @@ -3042,14 +3145,15 @@ struct reiserfs_transaction_handle *reiserfs_persistent_transaction(struct int ret; struct reiserfs_transaction_handle *th; - /* if we're nesting into an existing transaction. It will be - ** persistent on its own + /* + * if we're nesting into an existing transaction. It will be + * persistent on its own */ if (reiserfs_transaction_running(s)) { th = current->journal_info; th->t_refcount++; BUG_ON(th->t_refcount < 2); - + return th; } th = kmalloc(sizeof(struct reiserfs_transaction_handle), GFP_NOFS); @@ -3085,8 +3189,9 @@ static int journal_join(struct reiserfs_transaction_handle *th, { struct reiserfs_transaction_handle *cur_th = current->journal_info; - /* this keeps do_journal_end from NULLing out the current->journal_info - ** pointer + /* + * this keeps do_journal_end from NULLing out the + * current->journal_info pointer */ th->t_handle_save = cur_th; BUG_ON(cur_th && cur_th->t_refcount > 1); @@ -3098,8 +3203,9 @@ int journal_join_abort(struct reiserfs_transaction_handle *th, { struct reiserfs_transaction_handle *cur_th = current->journal_info; - /* this keeps do_journal_end from NULLing out the current->journal_info - ** pointer + /* + * this keeps do_journal_end from NULLing out the + * current->journal_info pointer */ th->t_handle_save = cur_th; BUG_ON(cur_th && cur_th->t_refcount > 1); @@ -3125,9 +3231,10 @@ int journal_begin(struct reiserfs_transaction_handle *th, "journal_info != 0"); return 0; } else { - /* we've ended up with a handle from a different filesystem. - ** save it and restore on journal_end. This should never - ** really happen... + /* + * we've ended up with a handle from a different + * filesystem. save it and restore on journal_end. + * This should never really happen... */ reiserfs_warning(sb, "clm-2100", "nesting info a different FS"); @@ -3140,9 +3247,10 @@ int journal_begin(struct reiserfs_transaction_handle *th, ret = do_journal_begin_r(th, sb, nblocks, JBEGIN_REG); BUG_ON(current->journal_info != th); - /* I guess this boils down to being the reciprocal of clm-2100 above. - * If do_journal_begin_r fails, we need to put it back, since journal_end - * won't be called to do it. */ + /* + * I guess this boils down to being the reciprocal of clm-2100 above. + * If do_journal_begin_r fails, we need to put it back, since + * journal_end won't be called to do it. */ if (ret) current->journal_info = th->t_handle_save; else @@ -3152,14 +3260,15 @@ int journal_begin(struct reiserfs_transaction_handle *th, } /* -** puts bh into the current transaction. If it was already there, reorders removes the -** old pointers from the hash, and puts new ones in (to make sure replay happen in the right order). -** -** if it was dirty, cleans and files onto the clean list. I can't let it be dirty again until the -** transaction is committed. -** -** if j_len, is bigger than j_len_alloc, it pushes j_len_alloc to 10 + j_len. -*/ + * puts bh into the current transaction. If it was already there, reorders + * removes the old pointers from the hash, and puts new ones in (to make + * sure replay happen in the right order). + * + * if it was dirty, cleans and files onto the clean list. I can't let it + * be dirty again until the transaction is committed. + * + * if j_len, is bigger than j_len_alloc, it pushes j_len_alloc to 10 + j_len. + */ int journal_mark_dirty(struct reiserfs_transaction_handle *th, struct super_block *sb, struct buffer_head *bh) { @@ -3184,9 +3293,10 @@ int journal_mark_dirty(struct reiserfs_transaction_handle *th, return 0; } - /* this must be turned into a panic instead of a warning. We can't allow - ** a dirty or journal_dirty or locked buffer to be logged, as some changes - ** could get to disk too early. NOT GOOD. + /* + * this must be turned into a panic instead of a warning. We can't + * allow a dirty or journal_dirty or locked buffer to be logged, as + * some changes could get to disk too early. NOT GOOD. */ if (!prepared || buffer_dirty(bh)) { reiserfs_warning(sb, "journal-1777", @@ -3205,8 +3315,10 @@ int journal_mark_dirty(struct reiserfs_transaction_handle *th, atomic_read(&(journal->j_wcount))); return 1; } - /* this error means I've screwed up, and we've overflowed the transaction. - ** Nothing can be done here, except make the FS readonly or panic. + /* + * this error means I've screwed up, and we've overflowed + * the transaction. Nothing can be done here, except make the + * FS readonly or panic. */ if (journal->j_len >= journal->j_trans_max) { reiserfs_panic(th->t_super, "journal-1413", @@ -3280,8 +3392,9 @@ int journal_end(struct reiserfs_transaction_handle *th, struct reiserfs_transaction_handle *cur_th = current->journal_info; - /* we aren't allowed to close a nested transaction on a different - ** filesystem from the one in the task struct + /* + * we aren't allowed to close a nested transaction on a + * different filesystem from the one in the task struct */ BUG_ON(cur_th->t_super != th->t_super); @@ -3295,13 +3408,14 @@ int journal_end(struct reiserfs_transaction_handle *th, } } -/* removes from the current transaction, relsing and descrementing any counters. -** also files the removed buffer directly onto the clean list -** -** called by journal_mark_freed when a block has been deleted -** -** returns 1 if it cleaned and relsed the buffer. 0 otherwise -*/ +/* + * removes from the current transaction, relsing and descrementing any counters. + * also files the removed buffer directly onto the clean list + * + * called by journal_mark_freed when a block has been deleted + * + * returns 1 if it cleaned and relsed the buffer. 0 otherwise + */ static int remove_from_transaction(struct super_block *sb, b_blocknr_t blocknr, int already_cleaned) { @@ -3350,15 +3464,16 @@ static int remove_from_transaction(struct super_block *sb, } /* -** for any cnode in a journal list, it can only be dirtied of all the -** transactions that include it are committed to disk. -** this checks through each transaction, and returns 1 if you are allowed to dirty, -** and 0 if you aren't -** -** it is called by dirty_journal_list, which is called after flush_commit_list has gotten all the log -** blocks for a given transaction on disk -** -*/ + * for any cnode in a journal list, it can only be dirtied of all the + * transactions that include it are committed to disk. + * this checks through each transaction, and returns 1 if you are allowed + * to dirty, and 0 if you aren't + * + * it is called by dirty_journal_list, which is called after + * flush_commit_list has gotten all the log blocks for a given + * transaction on disk + * + */ static int can_dirty(struct reiserfs_journal_cnode *cn) { struct super_block *sb = cn->sb; @@ -3366,9 +3481,10 @@ static int can_dirty(struct reiserfs_journal_cnode *cn) struct reiserfs_journal_cnode *cur = cn->hprev; int can_dirty = 1; - /* first test hprev. These are all newer than cn, so any node here - ** with the same block number and dev means this node can't be sent - ** to disk right now. + /* + * first test hprev. These are all newer than cn, so any node here + * with the same block number and dev means this node can't be sent + * to disk right now. */ while (cur && can_dirty) { if (cur->jlist && cur->bh && cur->blocknr && cur->sb == sb && @@ -3377,8 +3493,9 @@ static int can_dirty(struct reiserfs_journal_cnode *cn) } cur = cur->hprev; } - /* then test hnext. These are all older than cn. As long as they - ** are committed to the log, it is safe to write cn to disk + /* + * then test hnext. These are all older than cn. As long as they + * are committed to the log, it is safe to write cn to disk */ cur = cn->hnext; while (cur && can_dirty) { @@ -3392,9 +3509,10 @@ static int can_dirty(struct reiserfs_journal_cnode *cn) return can_dirty; } -/* syncs the commit blocks, but does not force the real buffers to disk -** will wait until the current transaction is done/committed before returning -*/ +/* + * syncs the commit blocks, but does not force the real buffers to disk + * will wait until the current transaction is done/committed before returning + */ int journal_end_sync(struct reiserfs_transaction_handle *th, struct super_block *sb, unsigned long nblocks) { @@ -3411,9 +3529,7 @@ int journal_end_sync(struct reiserfs_transaction_handle *th, return do_journal_end(th, sb, nblocks, COMMIT_NOW | WAIT); } -/* -** writeback the pending async commits to disk -*/ +/* writeback the pending async commits to disk */ static void flush_async_commits(struct work_struct *work) { struct reiserfs_journal *journal = @@ -3433,9 +3549,9 @@ static void flush_async_commits(struct work_struct *work) } /* -** flushes any old transactions to disk -** ends the current transaction if it is too old -*/ + * flushes any old transactions to disk + * ends the current transaction if it is too old + */ void reiserfs_flush_old_commits(struct super_block *sb) { time_t now; @@ -3443,13 +3559,15 @@ void reiserfs_flush_old_commits(struct super_block *sb) struct reiserfs_journal *journal = SB_JOURNAL(sb); now = get_seconds(); - /* safety check so we don't flush while we are replaying the log during + /* + * safety check so we don't flush while we are replaying the log during * mount */ if (list_empty(&journal->j_journal_list)) return; - /* check the current transaction. If there are no writers, and it is + /* + * check the current transaction. If there are no writers, and it is * too old, finish it, and force the commit blocks to disk */ if (atomic_read(&journal->j_wcount) <= 0 && @@ -3463,8 +3581,10 @@ void reiserfs_flush_old_commits(struct super_block *sb) journal_mark_dirty(&th, sb, SB_BUFFER_WITH_SB(sb)); - /* we're only being called from kreiserfsd, it makes no sense to do - ** an async commit so that kreiserfsd can do it later + /* + * we're only being called from kreiserfsd, it makes + * no sense to do an async commit so that kreiserfsd + * can do it later */ do_journal_end(&th, sb, 1, COMMIT_NOW | WAIT); } @@ -3472,16 +3592,20 @@ void reiserfs_flush_old_commits(struct super_block *sb) } /* -** returns 0 if do_journal_end should return right away, returns 1 if do_journal_end should finish the commit -** -** if the current transaction is too old, but still has writers, this will wait on j_join_wait until all -** the writers are done. By the time it wakes up, the transaction it was called has already ended, so it just -** flushes the commit list and returns 0. -** -** Won't batch when flush or commit_now is set. Also won't batch when others are waiting on j_join_wait. -** -** Note, we can't allow the journal_end to proceed while there are still writers in the log. -*/ + * returns 0 if do_journal_end should return right away, returns 1 if + * do_journal_end should finish the commit + * + * if the current transaction is too old, but still has writers, this will + * wait on j_join_wait until all the writers are done. By the time it + * wakes up, the transaction it was called has already ended, so it just + * flushes the commit list and returns 0. + * + * Won't batch when flush or commit_now is set. Also won't batch when + * others are waiting on j_join_wait. + * + * Note, we can't allow the journal_end to proceed while there are still + * writers in the log. + */ static int check_journal_end(struct reiserfs_transaction_handle *th, struct super_block *sb, unsigned long nblocks, int flags) @@ -3503,21 +3627,25 @@ static int check_journal_end(struct reiserfs_transaction_handle *th, } journal->j_len_alloc -= (th->t_blocks_allocated - th->t_blocks_logged); - if (atomic_read(&(journal->j_wcount)) > 0) { /* <= 0 is allowed. unmounting might not call begin */ + /* <= 0 is allowed. unmounting might not call begin */ + if (atomic_read(&(journal->j_wcount)) > 0) atomic_dec(&(journal->j_wcount)); - } - /* BUG, deal with case where j_len is 0, but people previously freed blocks need to be released - ** will be dealt with by next transaction that actually writes something, but should be taken - ** care of in this trans + /* + * BUG, deal with case where j_len is 0, but people previously + * freed blocks need to be released will be dealt with by next + * transaction that actually writes something, but should be taken + * care of in this trans */ BUG_ON(journal->j_len == 0); - /* if wcount > 0, and we are called to with flush or commit_now, - ** we wait on j_join_wait. We will wake up when the last writer has - ** finished the transaction, and started it on its way to the disk. - ** Then, we flush the commit or journal list, and just return 0 - ** because the rest of journal end was already done for this transaction. + /* + * if wcount > 0, and we are called to with flush or commit_now, + * we wait on j_join_wait. We will wake up when the last writer has + * finished the transaction, and started it on its way to the disk. + * Then, we flush the commit or journal list, and just return 0 + * because the rest of journal end was already done for this + * transaction. */ if (atomic_read(&(journal->j_wcount)) > 0) { if (flush || commit_now) { @@ -3533,7 +3661,10 @@ static int check_journal_end(struct reiserfs_transaction_handle *th, } unlock_journal(sb); - /* sleep while the current transaction is still j_jlocked */ + /* + * sleep while the current transaction is + * still j_jlocked + */ while (journal->j_trans_id == trans_id) { if (atomic_read(&journal->j_jlock)) { queue_log_writer(sb); @@ -3547,7 +3678,7 @@ static int check_journal_end(struct reiserfs_transaction_handle *th, } } BUG_ON(journal->j_trans_id == trans_id); - + if (commit_now && journal_list_still_alive(sb, trans_id) && wait_on_commit) { @@ -3585,19 +3716,22 @@ static int check_journal_end(struct reiserfs_transaction_handle *th, } /* -** Does all the work that makes deleting blocks safe. -** when deleting a block mark BH_JNew, just remove it from the current transaction, clean it's buffer_head and move on. -** -** otherwise: -** set a bit for the block in the journal bitmap. That will prevent it from being allocated for unformatted nodes -** before this transaction has finished. -** -** mark any cnodes for this block as BLOCK_FREED, and clear their bh pointers. That will prevent any old transactions with -** this block from trying to flush to the real location. Since we aren't removing the cnode from the journal_list_hash, -** the block can't be reallocated yet. -** -** Then remove it from the current transaction, decrementing any counters and filing it on the clean list. -*/ + * Does all the work that makes deleting blocks safe. + * when deleting a block mark BH_JNew, just remove it from the current + * transaction, clean it's buffer_head and move on. + * + * otherwise: + * set a bit for the block in the journal bitmap. That will prevent it from + * being allocated for unformatted nodes before this transaction has finished. + * + * mark any cnodes for this block as BLOCK_FREED, and clear their bh pointers. + * That will prevent any old transactions with this block from trying to flush + * to the real location. Since we aren't removing the cnode from the + * journal_list_hash, *the block can't be reallocated yet. + * + * Then remove it from the current transaction, decrementing any counters and + * filing it on the clean list. + */ int journal_mark_freed(struct reiserfs_transaction_handle *th, struct super_block *sb, b_blocknr_t blocknr) { @@ -3620,7 +3754,10 @@ int journal_mark_freed(struct reiserfs_transaction_handle *th, reiserfs_clean_and_file_buffer(bh); cleaned = remove_from_transaction(sb, blocknr, cleaned); } else { - /* set the bit for this block in the journal bitmap for this transaction */ + /* + * set the bit for this block in the journal bitmap + * for this transaction + */ jb = journal->j_current_jl->j_list_bitmap; if (!jb) { reiserfs_panic(sb, "journal-1702", @@ -3636,17 +3773,22 @@ int journal_mark_freed(struct reiserfs_transaction_handle *th, } cleaned = remove_from_transaction(sb, blocknr, cleaned); - /* find all older transactions with this block, make sure they don't try to write it out */ + /* + * find all older transactions with this block, + * make sure they don't try to write it out + */ cn = get_journal_hash_dev(sb, journal->j_list_hash_table, blocknr); while (cn) { if (sb == cn->sb && blocknr == cn->blocknr) { set_bit(BLOCK_FREED, &cn->state); if (cn->bh) { + /* + * remove_from_transaction will brelse + * the buffer if it was in the current + * trans + */ if (!cleaned) { - /* remove_from_transaction will brelse the buffer if it was - ** in the current trans - */ clear_buffer_journal_dirty(cn-> bh); clear_buffer_dirty(cn->bh); @@ -3661,7 +3803,11 @@ int journal_mark_freed(struct reiserfs_transaction_handle *th, "cn->bh->b_count < 0"); } } - if (cn->jlist) { /* since we are clearing the bh, we MUST dec nonzerolen */ + /* + * since we are clearing the bh, + * we MUST dec nonzerolen + */ + if (cn->jlist) { atomic_dec(& (cn->jlist-> j_nonzerolen)); @@ -3697,10 +3843,16 @@ static int __commit_trans_jl(struct inode *inode, unsigned long id, struct reiserfs_journal *journal = SB_JOURNAL(sb); int ret = 0; - /* is it from the current transaction, or from an unknown transaction? */ + /* + * is it from the current transaction, + * or from an unknown transaction? + */ if (id == journal->j_trans_id) { jl = journal->j_current_jl; - /* try to let other writers come in and grow this transaction */ + /* + * try to let other writers come in and + * grow this transaction + */ let_transaction_grow(sb, id); if (journal->j_trans_id != id) { goto flush_commit_only; @@ -3724,7 +3876,8 @@ static int __commit_trans_jl(struct inode *inode, unsigned long id, ret = 1; } else { - /* this gets tricky, we have to make sure the journal list in + /* + * this gets tricky, we have to make sure the journal list in * the inode still exists. We know the list is still around * if we've got a larger transaction id than the oldest list */ @@ -3751,7 +3904,8 @@ int reiserfs_commit_for_inode(struct inode *inode) unsigned int id = REISERFS_I(inode)->i_trans_id; struct reiserfs_journal_list *jl = REISERFS_I(inode)->i_jl; - /* for the whole inode, assume unset id means it was + /* + * for the whole inode, assume unset id means it was * changed in the current transaction. More conservative */ if (!id || !jl) { @@ -3789,12 +3943,11 @@ void reiserfs_restore_prepared_buffer(struct super_block *sb, extern struct tree_balance *cur_tb; /* -** before we can change a metadata block, we have to make sure it won't -** be written to disk while we are altering it. So, we must: -** clean it -** wait on it. -** -*/ + * before we can change a metadata block, we have to make sure it won't + * be written to disk while we are altering it. So, we must: + * clean it + * wait on it. + */ int reiserfs_prepare_for_journal(struct super_block *sb, struct buffer_head *bh, int wait) { @@ -3815,15 +3968,15 @@ int reiserfs_prepare_for_journal(struct super_block *sb, } /* -** long and ugly. If flush, will not return until all commit -** blocks and all real buffers in the trans are on disk. -** If no_async, won't return until all commit blocks are on disk. -** -** keep reading, there are comments as you go along -** -** If the journal is aborted, we just clean up. Things like flushing -** journal lists, etc just won't happen. -*/ + * long and ugly. If flush, will not return until all commit + * blocks and all real buffers in the trans are on disk. + * If no_async, won't return until all commit blocks are on disk. + * + * keep reading, there are comments as you go along + * + * If the journal is aborted, we just clean up. Things like flushing + * journal lists, etc just won't happen. + */ static int do_journal_end(struct reiserfs_transaction_handle *th, struct super_block *sb, unsigned long nblocks, int flags) @@ -3850,8 +4003,10 @@ static int do_journal_end(struct reiserfs_transaction_handle *th, BUG_ON(th->t_refcount > 1); BUG_ON(!th->t_trans_id); - /* protect flush_older_commits from doing mistakes if the - transaction ID counter gets overflowed. */ + /* + * protect flush_older_commits from doing mistakes if the + * transaction ID counter gets overflowed. + */ if (th->t_trans_id == ~0U) flags |= FLUSH_ALL | COMMIT_NOW | WAIT; flush = flags & FLUSH_ALL; @@ -3875,8 +4030,10 @@ static int do_journal_end(struct reiserfs_transaction_handle *th, wait_on_commit = 1; } - /* check_journal_end locks the journal, and unlocks if it does not return 1 - ** it tells us if we should continue with the journal_end, or just return + /* + * check_journal_end locks the journal, and unlocks if it does + * not return 1 it tells us if we should continue with the + * journal_end, or just return */ if (!check_journal_end(th, sb, nblocks, flags)) { reiserfs_schedule_old_flush(sb); @@ -3891,19 +4048,23 @@ static int do_journal_end(struct reiserfs_transaction_handle *th, } /* - ** j must wait means we have to flush the log blocks, and the real blocks for - ** this transaction + * j must wait means we have to flush the log blocks, and the + * real blocks for this transaction */ if (journal->j_must_wait > 0) { flush = 1; } #ifdef REISERFS_PREALLOCATE - /* quota ops might need to nest, setup the journal_info pointer for them - * and raise the refcount so that it is > 0. */ + /* + * quota ops might need to nest, setup the journal_info pointer + * for them and raise the refcount so that it is > 0. + */ current->journal_info = th; th->t_refcount++; - reiserfs_discard_all_prealloc(th); /* it should not involve new blocks into - * the transaction */ + + /* it should not involve new blocks into the transaction */ + reiserfs_discard_all_prealloc(th); + th->t_refcount--; current->journal_info = th->t_handle_save; #endif @@ -3919,7 +4080,10 @@ static int do_journal_end(struct reiserfs_transaction_handle *th, memcpy(get_journal_desc_magic(d_bh), JOURNAL_DESC_MAGIC, 8); set_desc_trans_id(desc, journal->j_trans_id); - /* setup commit block. Don't write (keep it clean too) this one until after everyone else is written */ + /* + * setup commit block. Don't write (keep it clean too) this one + * until after everyone else is written + */ c_bh = journal_getblk(sb, SB_ONDISK_JOURNAL_1st_BLOCK(sb) + ((journal->j_start + journal->j_len + 1) % SB_ONDISK_JOURNAL_SIZE(sb))); @@ -3931,7 +4095,8 @@ static int do_journal_end(struct reiserfs_transaction_handle *th, /* init this journal list */ jl = journal->j_current_jl; - /* we lock the commit before doing anything because + /* + * we lock the commit before doing anything because * we want to make sure nobody tries to run flush_commit_list until * the new transaction is fully setup, and we've already flushed the * ordered bh list @@ -3951,9 +4116,10 @@ static int do_journal_end(struct reiserfs_transaction_handle *th, atomic_set(&jl->j_commit_left, journal->j_len + 2); jl->j_realblock = NULL; - /* The ENTIRE FOR LOOP MUST not cause schedule to occur. - ** for each real block, add it to the journal list hash, - ** copy into real block index array in the commit or desc block + /* + * The ENTIRE FOR LOOP MUST not cause schedule to occur. + * for each real block, add it to the journal list hash, + * copy into real block index array in the commit or desc block */ trans_half = journal_trans_half(sb->s_blocksize); for (i = 0, cn = journal->j_first; cn; cn = cn->next, i++) { @@ -3972,9 +4138,10 @@ static int do_journal_end(struct reiserfs_transaction_handle *th, last_cn->next = jl_cn; } last_cn = jl_cn; - /* make sure the block we are trying to log is not a block - of journal or reserved area */ - + /* + * make sure the block we are trying to log + * is not a block of journal or reserved area + */ if (is_block_in_log_or_reserved_area (sb, cn->bh->b_blocknr)) { reiserfs_panic(sb, "journal-2332", @@ -4004,19 +4171,26 @@ static int do_journal_end(struct reiserfs_transaction_handle *th, set_desc_trans_id(desc, journal->j_trans_id); set_commit_trans_len(commit, journal->j_len); - /* special check in case all buffers in the journal were marked for not logging */ + /* + * special check in case all buffers in the journal + * were marked for not logging + */ BUG_ON(journal->j_len == 0); - /* we're about to dirty all the log blocks, mark the description block + /* + * we're about to dirty all the log blocks, mark the description block * dirty now too. Don't mark the commit block dirty until all the * others are on disk */ mark_buffer_dirty(d_bh); - /* first data block is j_start + 1, so add one to cur_write_start wherever you use it */ + /* + * first data block is j_start + 1, so add one to + * cur_write_start wherever you use it + */ cur_write_start = journal->j_start; cn = journal->j_first; - jindex = 1; /* start at one so we don't get the desc again */ + jindex = 1; /* start at one so we don't get the desc again */ while (cn) { clear_buffer_journal_new(cn->bh); /* copy all the real blocks into log area. dirty log blocks */ @@ -4042,7 +4216,10 @@ static int do_journal_end(struct reiserfs_transaction_handle *th, set_buffer_journal_dirty(cn->bh); clear_buffer_journaled(cn->bh); } else { - /* JDirty cleared sometime during transaction. don't log this one */ + /* + * JDirty cleared sometime during transaction. + * don't log this one + */ reiserfs_warning(sb, "journal-2048", "BAD, buffer in journal hash, " "but not JDirty!"); @@ -4054,9 +4231,10 @@ static int do_journal_end(struct reiserfs_transaction_handle *th, reiserfs_cond_resched(sb); } - /* we are done with both the c_bh and d_bh, but - ** c_bh must be written after all other commit blocks, - ** so we dirty/relse c_bh in flush_commit_list, with commit_left <= 1. + /* + * we are done with both the c_bh and d_bh, but + * c_bh must be written after all other commit blocks, + * so we dirty/relse c_bh in flush_commit_list, with commit_left <= 1. */ journal->j_current_jl = alloc_journal_list(sb); @@ -4087,15 +4265,18 @@ static int do_journal_end(struct reiserfs_transaction_handle *th, journal->j_next_async_flush = 0; init_journal_hash(sb); - // make sure reiserfs_add_jh sees the new current_jl before we - // write out the tails + /* + * make sure reiserfs_add_jh sees the new current_jl before we + * write out the tails + */ smp_mb(); - /* tail conversion targets have to hit the disk before we end the + /* + * tail conversion targets have to hit the disk before we end the * transaction. Otherwise a later transaction might repack the tail - * before this transaction commits, leaving the data block unflushed and - * clean, if we crash before the later transaction commits, the data block - * is lost. + * before this transaction commits, leaving the data block unflushed + * and clean, if we crash before the later transaction commits, the + * data block is lost. */ if (!list_empty(&jl->j_tail_bh_list)) { depth = reiserfs_write_unlock_nested(sb); @@ -4106,12 +4287,13 @@ static int do_journal_end(struct reiserfs_transaction_handle *th, BUG_ON(!list_empty(&jl->j_tail_bh_list)); mutex_unlock(&jl->j_commit_mutex); - /* honor the flush wishes from the caller, simple commits can - ** be done outside the journal lock, they are done below - ** - ** if we don't flush the commit list right now, we put it into - ** the work queue so the people waiting on the async progress work - ** queue don't wait for this proc to flush journal lists and such. + /* + * honor the flush wishes from the caller, simple commits can + * be done outside the journal lock, they are done below + * + * if we don't flush the commit list right now, we put it into + * the work queue so the people waiting on the async progress work + * queue don't wait for this proc to flush journal lists and such. */ if (flush) { flush_commit_list(sb, jl, 1); @@ -4120,9 +4302,10 @@ static int do_journal_end(struct reiserfs_transaction_handle *th, queue_delayed_work(REISERFS_SB(sb)->commit_wq, &journal->j_work, HZ / 10); - /* if the next transaction has any chance of wrapping, flush - ** transactions that might get overwritten. If any journal lists are very - ** old flush them as well. + /* + * if the next transaction has any chance of wrapping, flush + * transactions that might get overwritten. If any journal lists + * are very old flush them as well. */ first_jl: list_for_each_safe(entry, safe, &journal->j_journal_list) { @@ -4135,8 +4318,10 @@ static int do_journal_end(struct reiserfs_transaction_handle *th, } else if ((journal->j_start + journal->j_trans_max + 1) < SB_ONDISK_JOURNAL_SIZE(sb)) { - /* if we don't cross into the next transaction and we don't - * wrap, there is no way we can overlap any later transactions + /* + * if we don't cross into the next + * transaction and we don't wrap, there is + * no way we can overlap any later transactions * break now */ break; @@ -4150,10 +4335,12 @@ static int do_journal_end(struct reiserfs_transaction_handle *th, flush_used_journal_lists(sb, temp_jl); goto first_jl; } else { - /* we don't overlap anything from out start to the end of the - * log, and our wrapped portion doesn't overlap anything at - * the start of the log. We can break - */ + /* + * we don't overlap anything from out start + * to the end of the log, and our wrapped + * portion doesn't overlap anything at + * the start of the log. We can break + */ break; } } @@ -4181,9 +4368,11 @@ static int do_journal_end(struct reiserfs_transaction_handle *th, reiserfs_check_lock_depth(sb, "journal end2"); memset(th, 0, sizeof(*th)); - /* Re-set th->t_super, so we can properly keep track of how many + /* + * Re-set th->t_super, so we can properly keep track of how many * persistent transactions there are. We need to do this so if this - * call is part of a failed restart_transaction, we can free it later */ + * call is part of a failed restart_transaction, we can free it later + */ th->t_super = sb; return journal->j_errno; diff --git a/fs/reiserfs/lbalance.c b/fs/reiserfs/lbalance.c index b46399d98f84..d48a9e7507a1 100644 --- a/fs/reiserfs/lbalance.c +++ b/fs/reiserfs/lbalance.c @@ -8,28 +8,21 @@ #include "reiserfs.h" #include <linux/buffer_head.h> -/* these are used in do_balance.c */ - -/* leaf_move_items - leaf_shift_left - leaf_shift_right - leaf_delete_items - leaf_insert_into_buf - leaf_paste_in_buffer - leaf_cut_from_buffer - leaf_paste_entries - */ - -/* copy copy_count entries from source directory item to dest buffer (creating new item if needed) */ +/* + * copy copy_count entries from source directory item to dest buffer + * (creating new item if needed) + */ static void leaf_copy_dir_entries(struct buffer_info *dest_bi, struct buffer_head *source, int last_first, int item_num, int from, int copy_count) { struct buffer_head *dest = dest_bi->bi_bh; - int item_num_in_dest; /* either the number of target item, - or if we must create a new item, - the number of the item we will - create it next to */ + /* + * either the number of target item, or if we must create a + * new item, the number of the item we will create it next to + */ + int item_num_in_dest; + struct item_head *ih; struct reiserfs_de_head *deh; int copy_records_len; /* length of all records in item to be copied */ @@ -39,7 +32,10 @@ static void leaf_copy_dir_entries(struct buffer_info *dest_bi, RFALSE(!is_direntry_le_ih(ih), "vs-10000: item must be directory item"); - /* length of all record to be copied and first byte of the last of them */ + /* + * length of all record to be copied and first byte of + * the last of them + */ deh = B_I_DEH(source, ih); if (copy_count) { copy_records_len = (from ? deh_location(&(deh[from - 1])) : @@ -59,7 +55,10 @@ static void leaf_copy_dir_entries(struct buffer_info *dest_bi, LAST_TO_FIRST) ? ((B_NR_ITEMS(dest)) ? 0 : -1) : (B_NR_ITEMS(dest) - 1); - /* if there are no items in dest or the first/last item in dest is not item of the same directory */ + /* + * if there are no items in dest or the first/last item in + * dest is not item of the same directory + */ if ((item_num_in_dest == -1) || (last_first == FIRST_TO_LAST && le_ih_k_offset(ih) == DOT_OFFSET) || (last_first == LAST_TO_FIRST @@ -83,11 +82,17 @@ static void leaf_copy_dir_entries(struct buffer_info *dest_bi, if (from < ih_entry_count(ih)) { set_le_ih_k_offset(&new_ih, deh_offset(&(deh[from]))); - /*memcpy (&new_ih.ih_key.k_offset, &deh[from].deh_offset, SHORT_KEY_SIZE); */ } else { - /* no entries will be copied to this item in this function */ + /* + * no entries will be copied to this + * item in this function + */ set_le_ih_k_offset(&new_ih, U32_MAX); - /* this item is not yet valid, but we want I_IS_DIRECTORY_ITEM to return 1 for it, so we -1 */ + /* + * this item is not yet valid, but we + * want I_IS_DIRECTORY_ITEM to return 1 + * for it, so we -1 + */ } set_le_key_k_type(KEY_FORMAT_3_5, &(new_ih.ih_key), TYPE_DIRENTRY); @@ -119,30 +124,38 @@ static void leaf_copy_dir_entries(struct buffer_info *dest_bi, DEH_SIZE * copy_count + copy_records_len); } -/* Copy the first (if last_first == FIRST_TO_LAST) or last (last_first == LAST_TO_FIRST) item or - part of it or nothing (see the return 0 below) from SOURCE to the end - (if last_first) or beginning (!last_first) of the DEST */ +/* + * Copy the first (if last_first == FIRST_TO_LAST) or last + * (last_first == LAST_TO_FIRST) item or part of it or nothing + * (see the return 0 below) from SOURCE to the end (if last_first) + * or beginning (!last_first) of the DEST + */ /* returns 1 if anything was copied, else 0 */ static int leaf_copy_boundary_item(struct buffer_info *dest_bi, struct buffer_head *src, int last_first, int bytes_or_entries) { struct buffer_head *dest = dest_bi->bi_bh; - int dest_nr_item, src_nr_item; /* number of items in the source and destination buffers */ + /* number of items in the source and destination buffers */ + int dest_nr_item, src_nr_item; struct item_head *ih; struct item_head *dih; dest_nr_item = B_NR_ITEMS(dest); + /* + * if ( DEST is empty or first item of SOURCE and last item of + * DEST are the items of different objects or of different types ) + * then there is no need to treat this item differently from the + * other items that we copy, so we return + */ if (last_first == FIRST_TO_LAST) { - /* if ( DEST is empty or first item of SOURCE and last item of DEST are the items of different objects - or of different types ) then there is no need to treat this item differently from the other items - that we copy, so we return */ ih = item_head(src, 0); dih = item_head(dest, dest_nr_item - 1); + + /* there is nothing to merge */ if (!dest_nr_item || (!op_is_left_mergeable(&(ih->ih_key), src->b_size))) - /* there is nothing to merge */ return 0; RFALSE(!ih_item_len(ih), @@ -157,8 +170,11 @@ static int leaf_copy_boundary_item(struct buffer_info *dest_bi, return 1; } - /* copy part of the body of the first item of SOURCE to the end of the body of the last item of the DEST - part defined by 'bytes_or_entries'; if bytes_or_entries == -1 copy whole body; don't create new item header + /* + * copy part of the body of the first item of SOURCE + * to the end of the body of the last item of the DEST + * part defined by 'bytes_or_entries'; if bytes_or_entries + * == -1 copy whole body; don't create new item header */ if (bytes_or_entries == -1) bytes_or_entries = ih_item_len(ih); @@ -176,8 +192,10 @@ static int leaf_copy_boundary_item(struct buffer_info *dest_bi, } #endif - /* merge first item (or its part) of src buffer with the last - item of dest buffer. Both are of the same file */ + /* + * merge first item (or its part) of src buffer with the last + * item of dest buffer. Both are of the same file + */ leaf_paste_in_buffer(dest_bi, dest_nr_item - 1, ih_item_len(dih), bytes_or_entries, ih_item_body(src, ih), 0); @@ -195,8 +213,9 @@ static int leaf_copy_boundary_item(struct buffer_info *dest_bi, /* copy boundary item to right (last_first == LAST_TO_FIRST) */ - /* ( DEST is empty or last item of SOURCE and first item of DEST - are the items of different object or of different types ) + /* + * (DEST is empty or last item of SOURCE and first item of DEST + * are the items of different object or of different types) */ src_nr_item = B_NR_ITEMS(src); ih = item_head(src, src_nr_item - 1); @@ -206,8 +225,11 @@ static int leaf_copy_boundary_item(struct buffer_info *dest_bi, return 0; if (is_direntry_le_ih(ih)) { + /* + * bytes_or_entries = entries number in last + * item body of SOURCE + */ if (bytes_or_entries == -1) - /* bytes_or_entries = entries number in last item body of SOURCE */ bytes_or_entries = ih_entry_count(ih); leaf_copy_dir_entries(dest_bi, src, LAST_TO_FIRST, @@ -217,9 +239,11 @@ static int leaf_copy_boundary_item(struct buffer_info *dest_bi, return 1; } - /* copy part of the body of the last item of SOURCE to the begin of the body of the first item of the DEST; - part defined by 'bytes_or_entries'; if byte_or_entriess == -1 copy whole body; change first item key of the DEST; - don't create new item header + /* + * copy part of the body of the last item of SOURCE to the + * begin of the body of the first item of the DEST; part defined + * by 'bytes_or_entries'; if byte_or_entriess == -1 copy whole body; + * change first item key of the DEST; don't create new item header */ RFALSE(is_indirect_le_ih(ih) && get_ih_free_space(ih), @@ -276,9 +300,12 @@ static int leaf_copy_boundary_item(struct buffer_info *dest_bi, return 1; } -/* copy cpy_mun items from buffer src to buffer dest - * last_first == FIRST_TO_LAST means, that we copy cpy_num items beginning from first-th item in src to tail of dest - * last_first == LAST_TO_FIRST means, that we copy cpy_num items beginning from first-th item in src to head of dest +/* + * copy cpy_mun items from buffer src to buffer dest + * last_first == FIRST_TO_LAST means, that we copy cpy_num items beginning + * from first-th item in src to tail of dest + * last_first == LAST_TO_FIRST means, that we copy cpy_num items beginning + * from first-th item in src to head of dest */ static void leaf_copy_items_entirely(struct buffer_info *dest_bi, struct buffer_head *src, int last_first, @@ -311,7 +338,10 @@ static void leaf_copy_items_entirely(struct buffer_info *dest_bi, nr = blkh_nr_item(blkh); free_space = blkh_free_space(blkh); - /* we will insert items before 0-th or nr-th item in dest buffer. It depends of last_first parameter */ + /* + * we will insert items before 0-th or nr-th item in dest buffer. + * It depends of last_first parameter + */ dest_before = (last_first == LAST_TO_FIRST) ? 0 : nr; /* location of head of first new item */ @@ -377,8 +407,10 @@ static void leaf_copy_items_entirely(struct buffer_info *dest_bi, } } -/* This function splits the (liquid) item into two items (useful when - shifting part of an item into another node.) */ +/* + * This function splits the (liquid) item into two items (useful when + * shifting part of an item into another node.) + */ static void leaf_item_bottle(struct buffer_info *dest_bi, struct buffer_head *src, int last_first, int item_num, int cpy_bytes) @@ -390,7 +422,10 @@ static void leaf_item_bottle(struct buffer_info *dest_bi, "vs-10170: bytes == - 1 means: do not split item"); if (last_first == FIRST_TO_LAST) { - /* if ( if item in position item_num in buffer SOURCE is directory item ) */ + /* + * if ( if item in position item_num in buffer SOURCE + * is directory item ) + */ ih = item_head(src, item_num); if (is_direntry_le_ih(ih)) leaf_copy_dir_entries(dest_bi, src, FIRST_TO_LAST, @@ -398,9 +433,11 @@ static void leaf_item_bottle(struct buffer_info *dest_bi, else { struct item_head n_ih; - /* copy part of the body of the item number 'item_num' of SOURCE to the end of the DEST - part defined by 'cpy_bytes'; create new item header; change old item_header (????); - n_ih = new item_header; + /* + * copy part of the body of the item number 'item_num' + * of SOURCE to the end of the DEST part defined by + * 'cpy_bytes'; create new item header; change old + * item_header (????); n_ih = new item_header; */ memcpy(&n_ih, ih, IH_SIZE); put_ih_item_len(&n_ih, cpy_bytes); @@ -419,7 +456,10 @@ static void leaf_item_bottle(struct buffer_info *dest_bi, item_body(src, item_num), 0); } } else { - /* if ( if item in position item_num in buffer SOURCE is directory item ) */ + /* + * if ( if item in position item_num in buffer + * SOURCE is directory item ) + */ ih = item_head(src, item_num); if (is_direntry_le_ih(ih)) leaf_copy_dir_entries(dest_bi, src, LAST_TO_FIRST, @@ -429,13 +469,16 @@ static void leaf_item_bottle(struct buffer_info *dest_bi, else { struct item_head n_ih; - /* copy part of the body of the item number 'item_num' of SOURCE to the begin of the DEST - part defined by 'cpy_bytes'; create new item header; - n_ih = new item_header; + /* + * copy part of the body of the item number 'item_num' + * of SOURCE to the begin of the DEST part defined by + * 'cpy_bytes'; create new item header; + * n_ih = new item_header; */ memcpy(&n_ih, ih, SHORT_KEY_SIZE); - n_ih.ih_version = ih->ih_version; /* JDM Endian safe, both le */ + /* Endian safe, both le */ + n_ih.ih_version = ih->ih_version; if (is_direct_le_ih(ih)) { set_le_ih_k_offset(&n_ih, @@ -459,7 +502,8 @@ static void leaf_item_bottle(struct buffer_info *dest_bi, /* set item length */ put_ih_item_len(&n_ih, cpy_bytes); - n_ih.ih_version = ih->ih_version; /* JDM Endian safe, both le */ + /* Endian safe, both le */ + n_ih.ih_version = ih->ih_version; leaf_insert_into_buf(dest_bi, 0, &n_ih, item_body(src, item_num) + @@ -468,10 +512,12 @@ static void leaf_item_bottle(struct buffer_info *dest_bi, } } -/* If cpy_bytes equals minus one than copy cpy_num whole items from SOURCE to DEST. - If cpy_bytes not equal to minus one than copy cpy_num-1 whole items from SOURCE to DEST. - From last item copy cpy_num bytes for regular item and cpy_num directory entries for - directory item. */ +/* + * If cpy_bytes equals minus one than copy cpy_num whole items from SOURCE + * to DEST. If cpy_bytes not equal to minus one than copy cpy_num-1 whole + * items from SOURCE to DEST. From last item copy cpy_num bytes for regular + * item and cpy_num directory entries for directory item. + */ static int leaf_copy_items(struct buffer_info *dest_bi, struct buffer_head *src, int last_first, int cpy_num, int cpy_bytes) { @@ -498,22 +544,34 @@ static int leaf_copy_items(struct buffer_info *dest_bi, struct buffer_head *src, else bytes = -1; - /* copy the first item or it part or nothing to the end of the DEST (i = leaf_copy_boundary_item(DEST,SOURCE,0,bytes)) */ + /* + * copy the first item or it part or nothing to the end of + * the DEST (i = leaf_copy_boundary_item(DEST,SOURCE,0,bytes)) + */ i = leaf_copy_boundary_item(dest_bi, src, FIRST_TO_LAST, bytes); cpy_num -= i; if (cpy_num == 0) return i; pos += i; if (cpy_bytes == -1) - /* copy first cpy_num items starting from position 'pos' of SOURCE to end of DEST */ + /* + * copy first cpy_num items starting from position + * 'pos' of SOURCE to end of DEST + */ leaf_copy_items_entirely(dest_bi, src, FIRST_TO_LAST, pos, cpy_num); else { - /* copy first cpy_num-1 items starting from position 'pos-1' of the SOURCE to the end of the DEST */ + /* + * copy first cpy_num-1 items starting from position + * 'pos-1' of the SOURCE to the end of the DEST + */ leaf_copy_items_entirely(dest_bi, src, FIRST_TO_LAST, pos, cpy_num - 1); - /* copy part of the item which number is cpy_num+pos-1 to the end of the DEST */ + /* + * copy part of the item which number is + * cpy_num+pos-1 to the end of the DEST + */ leaf_item_bottle(dest_bi, src, FIRST_TO_LAST, cpy_num + pos - 1, cpy_bytes); } @@ -525,7 +583,11 @@ static int leaf_copy_items(struct buffer_info *dest_bi, struct buffer_head *src, else bytes = -1; - /* copy the last item or it part or nothing to the begin of the DEST (i = leaf_copy_boundary_item(DEST,SOURCE,1,bytes)); */ + /* + * copy the last item or it part or nothing to the + * begin of the DEST + * (i = leaf_copy_boundary_item(DEST,SOURCE,1,bytes)); + */ i = leaf_copy_boundary_item(dest_bi, src, LAST_TO_FIRST, bytes); cpy_num -= i; @@ -534,15 +596,24 @@ static int leaf_copy_items(struct buffer_info *dest_bi, struct buffer_head *src, pos = src_nr_item - cpy_num - i; if (cpy_bytes == -1) { - /* starting from position 'pos' copy last cpy_num items of SOURCE to begin of DEST */ + /* + * starting from position 'pos' copy last cpy_num + * items of SOURCE to begin of DEST + */ leaf_copy_items_entirely(dest_bi, src, LAST_TO_FIRST, pos, cpy_num); } else { - /* copy last cpy_num-1 items starting from position 'pos+1' of the SOURCE to the begin of the DEST; */ + /* + * copy last cpy_num-1 items starting from position + * 'pos+1' of the SOURCE to the begin of the DEST; + */ leaf_copy_items_entirely(dest_bi, src, LAST_TO_FIRST, pos + 1, cpy_num - 1); - /* copy part of the item which number is pos to the begin of the DEST */ + /* + * copy part of the item which number is pos to + * the begin of the DEST + */ leaf_item_bottle(dest_bi, src, LAST_TO_FIRST, pos, cpy_bytes); } @@ -550,9 +621,11 @@ static int leaf_copy_items(struct buffer_info *dest_bi, struct buffer_head *src, return i; } -/* there are types of coping: from S[0] to L[0], from S[0] to R[0], - from R[0] to L[0]. for each of these we have to define parent and - positions of destination and source buffers */ +/* + * there are types of coping: from S[0] to L[0], from S[0] to R[0], + * from R[0] to L[0]. for each of these we have to define parent and + * positions of destination and source buffers + */ static void leaf_define_dest_src_infos(int shift_mode, struct tree_balance *tb, struct buffer_info *dest_bi, struct buffer_info *src_bi, @@ -568,7 +641,9 @@ static void leaf_define_dest_src_infos(int shift_mode, struct tree_balance *tb, src_bi->tb = tb; src_bi->bi_bh = PATH_PLAST_BUFFER(tb->tb_path); src_bi->bi_parent = PATH_H_PPARENT(tb->tb_path, 0); - src_bi->bi_position = PATH_H_B_ITEM_ORDER(tb->tb_path, 0); /* src->b_item_order */ + + /* src->b_item_order */ + src_bi->bi_position = PATH_H_B_ITEM_ORDER(tb->tb_path, 0); dest_bi->tb = tb; dest_bi->bi_bh = tb->L[0]; dest_bi->bi_parent = tb->FL[0]; @@ -633,8 +708,10 @@ static void leaf_define_dest_src_infos(int shift_mode, struct tree_balance *tb, shift_mode, src_bi->bi_bh, dest_bi->bi_bh); } -/* copy mov_num items and mov_bytes of the (mov_num-1)th item to - neighbor. Delete them from source */ +/* + * copy mov_num items and mov_bytes of the (mov_num-1)th item to + * neighbor. Delete them from source + */ int leaf_move_items(int shift_mode, struct tree_balance *tb, int mov_num, int mov_bytes, struct buffer_head *Snew) { @@ -657,18 +734,24 @@ int leaf_move_items(int shift_mode, struct tree_balance *tb, int mov_num, return ret_value; } -/* Shift shift_num items (and shift_bytes of last shifted item if shift_bytes != -1) - from S[0] to L[0] and replace the delimiting key */ +/* + * Shift shift_num items (and shift_bytes of last shifted item if + * shift_bytes != -1) from S[0] to L[0] and replace the delimiting key + */ int leaf_shift_left(struct tree_balance *tb, int shift_num, int shift_bytes) { struct buffer_head *S0 = PATH_PLAST_BUFFER(tb->tb_path); int i; - /* move shift_num (and shift_bytes bytes) items from S[0] to left neighbor L[0] */ + /* + * move shift_num (and shift_bytes bytes) items from S[0] + * to left neighbor L[0] + */ i = leaf_move_items(LEAF_FROM_S_TO_L, tb, shift_num, shift_bytes, NULL); if (shift_num) { - if (B_NR_ITEMS(S0) == 0) { /* number of items in S[0] == 0 */ + /* number of items in S[0] == 0 */ + if (B_NR_ITEMS(S0) == 0) { RFALSE(shift_bytes != -1, "vs-10270: S0 is empty now, but shift_bytes != -1 (%d)", @@ -704,13 +787,18 @@ int leaf_shift_left(struct tree_balance *tb, int shift_num, int shift_bytes) /* CLEANING STOPPED HERE */ -/* Shift shift_num (shift_bytes) items from S[0] to the right neighbor, and replace the delimiting key */ +/* + * Shift shift_num (shift_bytes) items from S[0] to the right neighbor, + * and replace the delimiting key + */ int leaf_shift_right(struct tree_balance *tb, int shift_num, int shift_bytes) { - // struct buffer_head * S0 = PATH_PLAST_BUFFER (tb->tb_path); int ret_value; - /* move shift_num (and shift_bytes) items from S[0] to right neighbor R[0] */ + /* + * move shift_num (and shift_bytes) items from S[0] to + * right neighbor R[0] + */ ret_value = leaf_move_items(LEAF_FROM_S_TO_R, tb, shift_num, shift_bytes, NULL); @@ -725,12 +813,16 @@ int leaf_shift_right(struct tree_balance *tb, int shift_num, int shift_bytes) static void leaf_delete_items_entirely(struct buffer_info *bi, int first, int del_num); -/* If del_bytes == -1, starting from position 'first' delete del_num items in whole in buffer CUR. - If not. - If last_first == 0. Starting from position 'first' delete del_num-1 items in whole. Delete part of body of - the first item. Part defined by del_bytes. Don't delete first item header - If last_first == 1. Starting from position 'first+1' delete del_num-1 items in whole. Delete part of body of - the last item . Part defined by del_bytes. Don't delete last item header. +/* + * If del_bytes == -1, starting from position 'first' delete del_num + * items in whole in buffer CUR. + * If not. + * If last_first == 0. Starting from position 'first' delete del_num-1 + * items in whole. Delete part of body of the first item. Part defined by + * del_bytes. Don't delete first item header + * If last_first == 1. Starting from position 'first+1' delete del_num-1 + * items in whole. Delete part of body of the last item . Part defined by + * del_bytes. Don't delete last item header. */ void leaf_delete_items(struct buffer_info *cur_bi, int last_first, int first, int del_num, int del_bytes) @@ -761,32 +853,43 @@ void leaf_delete_items(struct buffer_info *cur_bi, int last_first, leaf_delete_items_entirely(cur_bi, first, del_num); else { if (last_first == FIRST_TO_LAST) { - /* delete del_num-1 items beginning from item in position first */ + /* + * delete del_num-1 items beginning from + * item in position first + */ leaf_delete_items_entirely(cur_bi, first, del_num - 1); - /* delete the part of the first item of the bh - do not delete item header + /* + * delete the part of the first item of the bh + * do not delete item header */ leaf_cut_from_buffer(cur_bi, 0, 0, del_bytes); } else { struct item_head *ih; int len; - /* delete del_num-1 items beginning from item in position first+1 */ + /* + * delete del_num-1 items beginning from + * item in position first+1 + */ leaf_delete_items_entirely(cur_bi, first + 1, del_num - 1); ih = item_head(bh, B_NR_ITEMS(bh) - 1); if (is_direntry_le_ih(ih)) /* the last item is directory */ - /* len = numbers of directory entries in this item */ + /* + * len = numbers of directory entries + * in this item + */ len = ih_entry_count(ih); else /* len = body len of item */ len = ih_item_len(ih); - /* delete the part of the last item of the bh - do not delete item header + /* + * delete the part of the last item of the bh + * do not delete item header */ leaf_cut_from_buffer(cur_bi, B_NR_ITEMS(bh) - 1, len - del_bytes, del_bytes); @@ -867,8 +970,10 @@ void leaf_insert_into_buf(struct buffer_info *bi, int before, } } -/* paste paste_size bytes to affected_item_num-th item. - When item is a directory, this only prepare space for new entries */ +/* + * paste paste_size bytes to affected_item_num-th item. + * When item is a directory, this only prepare space for new entries + */ void leaf_paste_in_buffer(struct buffer_info *bi, int affected_item_num, int pos_in_item, int paste_size, const char *body, int zeros_number) @@ -957,10 +1062,12 @@ void leaf_paste_in_buffer(struct buffer_info *bi, int affected_item_num, } } -/* cuts DEL_COUNT entries beginning from FROM-th entry. Directory item - does not have free space, so it moves DEHs and remaining records as - necessary. Return value is size of removed part of directory item - in bytes. */ +/* + * cuts DEL_COUNT entries beginning from FROM-th entry. Directory item + * does not have free space, so it moves DEHs and remaining records as + * necessary. Return value is size of removed part of directory item + * in bytes. + */ static int leaf_cut_entries(struct buffer_head *bh, struct item_head *ih, int from, int del_count) { @@ -971,8 +1078,10 @@ static int leaf_cut_entries(struct buffer_head *bh, int cut_records_len; /* length of all removed records */ int i; - /* make sure, that item is directory and there are enough entries to - remove */ + /* + * make sure that item is directory and there are enough entries to + * remove + */ RFALSE(!is_direntry_le_ih(ih), "10180: item is not directory item"); RFALSE(ih_entry_count(ih) < from + del_count, "10185: item contains not enough entries: entry_count = %d, from = %d, to delete = %d", @@ -987,8 +1096,10 @@ static int leaf_cut_entries(struct buffer_head *bh, /* entry head array */ deh = B_I_DEH(bh, ih); - /* first byte of remaining entries, those are BEFORE cut entries - (prev_record) and length of all removed records (cut_records_len) */ + /* + * first byte of remaining entries, those are BEFORE cut entries + * (prev_record) and length of all removed records (cut_records_len) + */ prev_record_offset = (from ? deh_location(&(deh[from - 1])) : ih_item_len(ih)); cut_records_len = prev_record_offset /*from_record */ - @@ -1021,14 +1132,15 @@ static int leaf_cut_entries(struct buffer_head *bh, return DEH_SIZE * del_count + cut_records_len; } -/* when cut item is part of regular file - pos_in_item - first byte that must be cut - cut_size - number of bytes to be cut beginning from pos_in_item - - when cut item is part of directory - pos_in_item - number of first deleted entry - cut_size - count of deleted entries - */ +/* + * when cut item is part of regular file + * pos_in_item - first byte that must be cut + * cut_size - number of bytes to be cut beginning from pos_in_item + * + * when cut item is part of directory + * pos_in_item - number of first deleted entry + * cut_size - count of deleted entries + */ void leaf_cut_from_buffer(struct buffer_info *bi, int cut_item_num, int pos_in_item, int cut_size) { @@ -1055,7 +1167,6 @@ void leaf_cut_from_buffer(struct buffer_info *bi, int cut_item_num, cut_item_num); /* change item key by key of first entry in the item */ set_le_ih_k_offset(ih, deh_offset(B_I_DEH(bh, ih))); - /*memcpy (&ih->ih_key.k_offset, &(B_I_DEH (bh, ih)->deh_offset), SHORT_KEY_SIZE); */ } } else { /* item is direct or indirect */ @@ -1195,7 +1306,10 @@ static void leaf_delete_items_entirely(struct buffer_info *bi, } } -/* paste new_entry_count entries (new_dehs, records) into position before to item_num-th item */ +/* + * paste new_entry_count entries (new_dehs, records) into position + * before to item_num-th item + */ void leaf_paste_entries(struct buffer_info *bi, int item_num, int before, @@ -1215,7 +1329,10 @@ void leaf_paste_entries(struct buffer_info *bi, ih = item_head(bh, item_num); - /* make sure, that item is directory, and there are enough records in it */ + /* + * make sure, that item is directory, and there are enough + * records in it + */ RFALSE(!is_direntry_le_ih(ih), "10225: item is not directory item"); RFALSE(ih_entry_count(ih) < before, "10230: there are no entry we paste entries before. entry_count = %d, before = %d", @@ -1277,8 +1394,6 @@ void leaf_paste_entries(struct buffer_info *bi, /* change item key if necessary (when we paste before 0-th entry */ if (!before) { set_le_ih_k_offset(ih, deh_offset(new_dehs)); -/* memcpy (&ih->ih_key.k_offset, - &new_dehs->deh_offset, SHORT_KEY_SIZE);*/ } #ifdef CONFIG_REISERFS_CHECK { diff --git a/fs/reiserfs/namei.c b/fs/reiserfs/namei.c index 1ce8fbea4749..6bc38de8357f 100644 --- a/fs/reiserfs/namei.c +++ b/fs/reiserfs/namei.c @@ -22,8 +22,10 @@ #define INC_DIR_INODE_NLINK(i) if (i->i_nlink != 1) { inc_nlink(i); if (i->i_nlink >= REISERFS_LINK_MAX) set_nlink(i, 1); } #define DEC_DIR_INODE_NLINK(i) if (i->i_nlink != 1) drop_nlink(i); -// directory item contains array of entry headers. This performs -// binary search through that array +/* + * directory item contains array of entry headers. This performs + * binary search through that array + */ static int bin_search_in_dir_item(struct reiserfs_dir_entry *de, loff_t off) { struct item_head *ih = de->de_ih; @@ -43,7 +45,7 @@ static int bin_search_in_dir_item(struct reiserfs_dir_entry *de, loff_t off) lbound = j + 1; continue; } - // this is not name found, but matched third key component + /* this is not name found, but matched third key component */ de->de_entry_num = j; return NAME_FOUND; } @@ -52,7 +54,9 @@ static int bin_search_in_dir_item(struct reiserfs_dir_entry *de, loff_t off) return NAME_NOT_FOUND; } -// comment? maybe something like set de to point to what the path points to? +/* + * comment? maybe something like set de to point to what the path points to? + */ static inline void set_de_item_location(struct reiserfs_dir_entry *de, struct treepath *path) { @@ -62,7 +66,9 @@ static inline void set_de_item_location(struct reiserfs_dir_entry *de, de->de_item_num = PATH_LAST_POSITION(path); } -// de_bh, de_ih, de_deh (points to first element of array), de_item_num is set +/* + * de_bh, de_ih, de_deh (points to first element of array), de_item_num is set + */ inline void set_de_name_and_namelen(struct reiserfs_dir_entry *de) { struct reiserfs_de_head *deh = de->de_deh + de->de_entry_num; @@ -76,7 +82,7 @@ inline void set_de_name_and_namelen(struct reiserfs_dir_entry *de) de->de_namelen = strlen(de->de_name); } -// what entry points to +/* what entry points to */ static inline void set_de_object_key(struct reiserfs_dir_entry *de) { BUG_ON(de->de_entry_num >= ih_entry_count(de->de_ih)); @@ -100,17 +106,16 @@ static inline void store_de_entry_key(struct reiserfs_dir_entry *de) set_cpu_key_k_type(&(de->de_entry_key), TYPE_DIRENTRY); } -/* We assign a key to each directory item, and place multiple entries -in a single directory item. A directory item has a key equal to the -key of the first directory entry in it. - -This function first calls search_by_key, then, if item whose first -entry matches is not found it looks for the entry inside directory -item found by search_by_key. Fills the path to the entry, and to the -entry position in the item - -*/ - +/* + * We assign a key to each directory item, and place multiple entries in a + * single directory item. A directory item has a key equal to the key of + * the first directory entry in it. + + * This function first calls search_by_key, then, if item whose first entry + * matches is not found it looks for the entry inside directory item found + * by search_by_key. Fills the path to the entry, and to the entry position + * in the item + */ /* The function is NOT SCHEDULE-SAFE! */ int search_by_entry_key(struct super_block *sb, const struct cpu_key *key, struct treepath *path, struct reiserfs_dir_entry *de) @@ -152,12 +157,17 @@ int search_by_entry_key(struct super_block *sb, const struct cpu_key *key, } #endif /* CONFIG_REISERFS_CHECK */ - /* binary search in directory item by third componen t of the - key. sets de->de_entry_num of de */ + /* + * binary search in directory item by third component of the + * key. sets de->de_entry_num of de + */ retval = bin_search_in_dir_item(de, cpu_key_k_offset(key)); path->pos_in_item = de->de_entry_num; if (retval != NAME_NOT_FOUND) { - // ugly, but rename needs de_bh, de_deh, de_name, de_namelen, de_objectid set + /* + * ugly, but rename needs de_bh, de_deh, de_name, + * de_namelen, de_objectid set + */ set_de_name_and_namelen(de); set_de_object_key(de); } @@ -166,11 +176,12 @@ int search_by_entry_key(struct super_block *sb, const struct cpu_key *key, /* Keyed 32-bit hash function using TEA in a Davis-Meyer function */ -/* The third component is hashed, and you can choose from more than - one hash function. Per directory hashes are not yet implemented - but are thought about. This function should be moved to hashes.c - Jedi, please do so. -Hans */ - +/* + * The third component is hashed, and you can choose from more than + * one hash function. Per directory hashes are not yet implemented + * but are thought about. This function should be moved to hashes.c + * Jedi, please do so. -Hans + */ static __u32 get_third_component(struct super_block *s, const char *name, int len) { @@ -183,11 +194,13 @@ static __u32 get_third_component(struct super_block *s, res = REISERFS_SB(s)->s_hash_function(name, len); - // take bits from 7-th to 30-th including both bounds + /* take bits from 7-th to 30-th including both bounds */ res = GET_HASH_VALUE(res); if (res == 0) - // needed to have no names before "." and ".." those have hash - // value == 0 and generation conters 1 and 2 accordingly + /* + * needed to have no names before "." and ".." those have hash + * value == 0 and generation conters 1 and 2 accordingly + */ res = 128; return res + MAX_GENERATION_NUMBER; } @@ -208,7 +221,7 @@ static int reiserfs_match(struct reiserfs_dir_entry *de, /* de's de_bh, de_ih, de_deh, de_item_num, de_entry_num are set already */ - /* used when hash collisions exist */ +/* used when hash collisions exist */ static int linear_search_in_dir_item(struct cpu_key *key, struct reiserfs_dir_entry *de, @@ -232,43 +245,50 @@ static int linear_search_in_dir_item(struct cpu_key *key, deh += i; for (; i >= 0; i--, deh--) { + /* hash value does not match, no need to check whole name */ if (GET_HASH_VALUE(deh_offset(deh)) != GET_HASH_VALUE(cpu_key_k_offset(key))) { - // hash value does not match, no need to check whole name return NAME_NOT_FOUND; } - /* mark, that this generation number is used */ + /* mark that this generation number is used */ if (de->de_gen_number_bit_string) set_bit(GET_GENERATION_NUMBER(deh_offset(deh)), de->de_gen_number_bit_string); - // calculate pointer to name and namelen + /* calculate pointer to name and namelen */ de->de_entry_num = i; set_de_name_and_namelen(de); + /* + * de's de_name, de_namelen, de_recordlen are set. + * Fill the rest. + */ if ((retval = reiserfs_match(de, name, namelen)) != NAME_NOT_FOUND) { - // de's de_name, de_namelen, de_recordlen are set. Fill the rest: - // key of pointed object + /* key of pointed object */ set_de_object_key(de); store_de_entry_key(de); - // retval can be NAME_FOUND or NAME_FOUND_INVISIBLE + /* retval can be NAME_FOUND or NAME_FOUND_INVISIBLE */ return retval; } } if (GET_GENERATION_NUMBER(le_ih_k_offset(de->de_ih)) == 0) - /* we have reached left most entry in the node. In common we - have to go to the left neighbor, but if generation counter - is 0 already, we know for sure, that there is no name with - the same hash value */ - // FIXME: this work correctly only because hash value can not - // be 0. Btw, in case of Yura's hash it is probably possible, - // so, this is a bug + /* + * we have reached left most entry in the node. In common we + * have to go to the left neighbor, but if generation counter + * is 0 already, we know for sure, that there is no name with + * the same hash value + */ + /* + * FIXME: this work correctly only because hash value can not + * be 0. Btw, in case of Yura's hash it is probably possible, + * so, this is a bug + */ return NAME_NOT_FOUND; RFALSE(de->de_item_num, @@ -277,8 +297,10 @@ static int linear_search_in_dir_item(struct cpu_key *key, return GOTO_PREVIOUS_ITEM; } -// may return NAME_FOUND, NAME_FOUND_INVISIBLE, NAME_NOT_FOUND -// FIXME: should add something like IOERROR +/* + * may return NAME_FOUND, NAME_FOUND_INVISIBLE, NAME_NOT_FOUND + * FIXME: should add something like IOERROR + */ static int reiserfs_find_entry(struct inode *dir, const char *name, int namelen, struct treepath *path_to_entry, struct reiserfs_dir_entry *de) @@ -307,13 +329,19 @@ static int reiserfs_find_entry(struct inode *dir, const char *name, int namelen, retval = linear_search_in_dir_item(&key_to_search, de, name, namelen); + /* + * there is no need to scan directory anymore. + * Given entry found or does not exist + */ if (retval != GOTO_PREVIOUS_ITEM) { - /* there is no need to scan directory anymore. Given entry found or does not exist */ path_to_entry->pos_in_item = de->de_entry_num; return retval; } - /* there is left neighboring item of this directory and given entry can be there */ + /* + * there is left neighboring item of this directory + * and given entry can be there + */ set_cpu_key_k_offset(&key_to_search, le_ih_k_offset(de->de_ih) - 1); pathrelse(path_to_entry); @@ -347,8 +375,10 @@ static struct dentry *reiserfs_lookup(struct inode *dir, struct dentry *dentry, return ERR_PTR(-EACCES); } - /* Propagate the private flag so we know we're - * in the priv tree */ + /* + * Propagate the private flag so we know we're + * in the priv tree + */ if (IS_PRIVATE(dir)) inode->i_flags |= S_PRIVATE; } @@ -361,9 +391,9 @@ static struct dentry *reiserfs_lookup(struct inode *dir, struct dentry *dentry, } /* -** looks up the dentry of the parent directory for child. -** taken from ext2_get_parent -*/ + * looks up the dentry of the parent directory for child. + * taken from ext2_get_parent + */ struct dentry *reiserfs_get_parent(struct dentry *child) { int retval; @@ -406,8 +436,13 @@ static int reiserfs_add_entry(struct reiserfs_transaction_handle *th, struct reiserfs_dir_entry de; DECLARE_BITMAP(bit_string, MAX_GENERATION_NUMBER + 1); int gen_number; - char small_buf[32 + DEH_SIZE]; /* 48 bytes now and we avoid kmalloc - if we create file with short name */ + + /* + * 48 bytes now and we avoid kmalloc if we + * create file with short name + */ + char small_buf[32 + DEH_SIZE]; + char *buffer; int buflen, paste_size; int retval; @@ -439,21 +474,30 @@ static int reiserfs_add_entry(struct reiserfs_transaction_handle *th, (get_inode_sd_version(dir) == STAT_DATA_V1) ? (DEH_SIZE + namelen) : buflen; - /* fill buffer : directory entry head, name[, dir objectid | , stat data | ,stat data, dir objectid ] */ + /* + * fill buffer : directory entry head, name[, dir objectid | , + * stat data | ,stat data, dir objectid ] + */ deh = (struct reiserfs_de_head *)buffer; deh->deh_location = 0; /* JDM Endian safe if 0 */ put_deh_offset(deh, cpu_key_k_offset(&entry_key)); deh->deh_state = 0; /* JDM Endian safe if 0 */ /* put key (ino analog) to de */ - deh->deh_dir_id = INODE_PKEY(inode)->k_dir_id; /* safe: k_dir_id is le */ - deh->deh_objectid = INODE_PKEY(inode)->k_objectid; /* safe: k_objectid is le */ + + /* safe: k_dir_id is le */ + deh->deh_dir_id = INODE_PKEY(inode)->k_dir_id; + /* safe: k_objectid is le */ + deh->deh_objectid = INODE_PKEY(inode)->k_objectid; /* copy name */ memcpy((char *)(deh + 1), name, namelen); /* padd by 0s to the 4 byte boundary */ padd_item((char *)(deh + 1), ROUND_UP(namelen), namelen); - /* entry is ready to be pasted into tree, set 'visibility' and 'stat data in entry' attributes */ + /* + * entry is ready to be pasted into tree, set 'visibility' + * and 'stat data in entry' attributes + */ mark_de_without_sd(deh); visible ? mark_de_visible(deh) : mark_de_hidden(deh); @@ -499,7 +543,8 @@ static int reiserfs_add_entry(struct reiserfs_transaction_handle *th, /* update max-hash-collisions counter in reiserfs_sb_info */ PROC_INFO_MAX(th->t_super, max_hash_collisions, gen_number); - if (gen_number != 0) { /* we need to re-search for the insertion point */ + /* we need to re-search for the insertion point */ + if (gen_number != 0) { if (search_by_entry_key(dir->i_sb, &entry_key, &path, &de) != NAME_NOT_FOUND) { reiserfs_warning(dir->i_sb, "vs-7032", @@ -527,18 +572,19 @@ static int reiserfs_add_entry(struct reiserfs_transaction_handle *th, dir->i_size += paste_size; dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC; if (!S_ISDIR(inode->i_mode) && visible) - // reiserfs_mkdir or reiserfs_rename will do that by itself + /* reiserfs_mkdir or reiserfs_rename will do that by itself */ reiserfs_update_sd(th, dir); reiserfs_check_path(&path); return 0; } -/* quota utility function, call if you've had to abort after calling -** new_inode_init, and have not called reiserfs_new_inode yet. -** This should only be called on inodes that do not have stat data -** inserted into the tree yet. -*/ +/* + * quota utility function, call if you've had to abort after calling + * new_inode_init, and have not called reiserfs_new_inode yet. + * This should only be called on inodes that do not have stat data + * inserted into the tree yet. + */ static int drop_new_inode(struct inode *inode) { dquot_drop(inode); @@ -548,18 +594,23 @@ static int drop_new_inode(struct inode *inode) return 0; } -/* utility function that does setup for reiserfs_new_inode. -** dquot_initialize needs lots of credits so it's better to have it -** outside of a transaction, so we had to pull some bits of -** reiserfs_new_inode out into this func. -*/ +/* + * utility function that does setup for reiserfs_new_inode. + * dquot_initialize needs lots of credits so it's better to have it + * outside of a transaction, so we had to pull some bits of + * reiserfs_new_inode out into this func. + */ static int new_inode_init(struct inode *inode, struct inode *dir, umode_t mode) { - /* Make inode invalid - just in case we are going to drop it before - * the initialization happens */ + /* + * Make inode invalid - just in case we are going to drop it before + * the initialization happens + */ INODE_PKEY(inode)->k_objectid = 0; - /* the quota init calls have to know who to charge the quota to, so - ** we have to set uid and gid here + + /* + * the quota init calls have to know who to charge the quota to, so + * we have to set uid and gid here */ inode_init_owner(inode, dir, mode); dquot_initialize(inode); @@ -571,7 +622,10 @@ static int reiserfs_create(struct inode *dir, struct dentry *dentry, umode_t mod { int retval; struct inode *inode; - /* We need blocks for transaction + (user+group)*(quotas for new inode + update of quota for directory owner) */ + /* + * We need blocks for transaction + (user+group)*(quotas + * for new inode + update of quota for directory owner) + */ int jbegin_count = JOURNAL_PER_BALANCE_CNT * 2 + 2 * (REISERFS_QUOTA_INIT_BLOCKS(dir->i_sb) + @@ -644,7 +698,10 @@ static int reiserfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode struct inode *inode; struct reiserfs_transaction_handle th; struct reiserfs_security_handle security; - /* We need blocks for transaction + (user+group)*(quotas for new inode + update of quota for directory owner) */ + /* + * We need blocks for transaction + (user+group)*(quotas + * for new inode + update of quota for directory owner) + */ int jbegin_count = JOURNAL_PER_BALANCE_CNT * 3 + 2 * (REISERFS_QUOTA_INIT_BLOCKS(dir->i_sb) + @@ -685,7 +742,7 @@ static int reiserfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode inode->i_op = &reiserfs_special_inode_operations; init_special_inode(inode, inode->i_mode, rdev); - //FIXME: needed for block and char devices only + /* FIXME: needed for block and char devices only */ reiserfs_update_sd(&th, inode); reiserfs_update_inode_transaction(inode); @@ -721,7 +778,10 @@ static int reiserfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode struct inode *inode; struct reiserfs_transaction_handle th; struct reiserfs_security_handle security; - /* We need blocks for transaction + (user+group)*(quotas for new inode + update of quota for directory owner) */ + /* + * We need blocks for transaction + (user+group)*(quotas + * for new inode + update of quota for directory owner) + */ int jbegin_count = JOURNAL_PER_BALANCE_CNT * 3 + 2 * (REISERFS_QUOTA_INIT_BLOCKS(dir->i_sb) + @@ -730,7 +790,10 @@ static int reiserfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode dquot_initialize(dir); #ifdef DISPLACE_NEW_PACKING_LOCALITIES - /* set flag that new packing locality created and new blocks for the content * of that directory are not displaced yet */ + /* + * set flag that new packing locality created and new blocks + * for the content of that directory are not displaced yet + */ REISERFS_I(dir)->new_packing_locality = 1; #endif mode = S_IFDIR | mode; @@ -754,8 +817,9 @@ static int reiserfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode goto out_failed; } - /* inc the link count now, so another writer doesn't overflow it while - ** we sleep later on. + /* + * inc the link count now, so another writer doesn't overflow + * it while we sleep later on. */ INC_DIR_INODE_NLINK(dir) @@ -774,7 +838,7 @@ static int reiserfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode inode->i_op = &reiserfs_dir_inode_operations; inode->i_fop = &reiserfs_dir_operations; - // note, _this_ add_entry will not update dir's stat data + /* note, _this_ add_entry will not update dir's stat data */ retval = reiserfs_add_entry(&th, dir, dentry->d_name.name, dentry->d_name.len, inode, 1 /*visible */ ); @@ -790,7 +854,7 @@ static int reiserfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode iput(inode); goto out_failed; } - // the above add_entry did not update dir's stat data + /* the above add_entry did not update dir's stat data */ reiserfs_update_sd(&th, dir); unlock_new_inode(inode); @@ -803,10 +867,11 @@ out_failed: static inline int reiserfs_empty_dir(struct inode *inode) { - /* we can cheat because an old format dir cannot have - ** EMPTY_DIR_SIZE, and a new format dir cannot have - ** EMPTY_DIR_SIZE_V1. So, if the inode is either size, - ** regardless of disk format version, the directory is empty. + /* + * we can cheat because an old format dir cannot have + * EMPTY_DIR_SIZE, and a new format dir cannot have + * EMPTY_DIR_SIZE_V1. So, if the inode is either size, + * regardless of disk format version, the directory is empty. */ if (inode->i_size != EMPTY_DIR_SIZE && inode->i_size != EMPTY_DIR_SIZE_V1) { @@ -824,10 +889,12 @@ static int reiserfs_rmdir(struct inode *dir, struct dentry *dentry) INITIALIZE_PATH(path); struct reiserfs_dir_entry de; - /* we will be doing 2 balancings and update 2 stat data, we change quotas - * of the owner of the directory and of the owner of the parent directory. - * The quota structure is possibly deleted only on last iput => outside - * of this transaction */ + /* + * we will be doing 2 balancings and update 2 stat data, we + * change quotas of the owner of the directory and of the owner + * of the parent directory. The quota structure is possibly + * deleted only on last iput => outside of this transaction + */ jbegin_count = JOURNAL_PER_BALANCE_CNT * 2 + 2 + 4 * REISERFS_QUOTA_TRANS_BLOCKS(dir->i_sb); @@ -856,8 +923,9 @@ static int reiserfs_rmdir(struct inode *dir, struct dentry *dentry) reiserfs_update_inode_transaction(dir); if (de.de_objectid != inode->i_ino) { - // FIXME: compare key of an object and a key found in the - // entry + /* + * FIXME: compare key of an object and a key found in the entry + */ retval = -EIO; goto end_rmdir; } @@ -895,9 +963,11 @@ static int reiserfs_rmdir(struct inode *dir, struct dentry *dentry) return retval; end_rmdir: - /* we must release path, because we did not call - reiserfs_cut_from_item, or reiserfs_cut_from_item does not - release path if operation was not complete */ + /* + * we must release path, because we did not call + * reiserfs_cut_from_item, or reiserfs_cut_from_item does not + * release path if operation was not complete + */ pathrelse(&path); err = journal_end(&th, dir->i_sb, jbegin_count); reiserfs_write_unlock(dir->i_sb); @@ -918,10 +988,13 @@ static int reiserfs_unlink(struct inode *dir, struct dentry *dentry) inode = dentry->d_inode; - /* in this transaction we can be doing at max two balancings and update - * two stat datas, we change quotas of the owner of the directory and of - * the owner of the parent directory. The quota structure is possibly - * deleted only on iput => outside of this transaction */ + /* + * in this transaction we can be doing at max two balancings and + * update two stat datas, we change quotas of the owner of the + * directory and of the owner of the parent directory. The quota + * structure is possibly deleted only on iput => outside of + * this transaction + */ jbegin_count = JOURNAL_PER_BALANCE_CNT * 2 + 2 + 4 * REISERFS_QUOTA_TRANS_BLOCKS(dir->i_sb); @@ -946,8 +1019,9 @@ static int reiserfs_unlink(struct inode *dir, struct dentry *dentry) reiserfs_update_inode_transaction(dir); if (de.de_objectid != inode->i_ino) { - // FIXME: compare key of an object and a key found in the - // entry + /* + * FIXME: compare key of an object and a key found in the entry + */ retval = -EIO; goto end_unlink; } @@ -1011,7 +1085,10 @@ static int reiserfs_symlink(struct inode *parent_dir, struct reiserfs_transaction_handle th; struct reiserfs_security_handle security; int mode = S_IFLNK | S_IRWXUGO; - /* We need blocks for transaction + (user+group)*(quotas for new inode + update of quota for directory owner) */ + /* + * We need blocks for transaction + (user+group)*(quotas for + * new inode + update of quota for directory owner) + */ int jbegin_count = JOURNAL_PER_BALANCE_CNT * 3 + 2 * (REISERFS_QUOTA_INIT_BLOCKS(parent_dir->i_sb) + @@ -1070,10 +1147,6 @@ static int reiserfs_symlink(struct inode *parent_dir, inode->i_op = &reiserfs_symlink_inode_operations; inode->i_mapping->a_ops = &reiserfs_address_space_operations; - // must be sure this inode is written with this transaction - // - //reiserfs_update_sd (&th, inode, READ_BLOCKS); - retval = reiserfs_add_entry(&th, parent_dir, dentry->d_name.name, dentry->d_name.len, inode, 1 /*visible */ ); if (retval) { @@ -1102,7 +1175,10 @@ static int reiserfs_link(struct dentry *old_dentry, struct inode *dir, int retval; struct inode *inode = old_dentry->d_inode; struct reiserfs_transaction_handle th; - /* We need blocks for transaction + update of quotas for the owners of the directory */ + /* + * We need blocks for transaction + update of quotas for + * the owners of the directory + */ int jbegin_count = JOURNAL_PER_BALANCE_CNT * 3 + 2 * REISERFS_QUOTA_TRANS_BLOCKS(dir->i_sb); @@ -1111,7 +1187,7 @@ static int reiserfs_link(struct dentry *old_dentry, struct inode *dir, reiserfs_write_lock(dir->i_sb); if (inode->i_nlink >= REISERFS_LINK_MAX) { - //FIXME: sd_nlink is 32 bit for new files + /* FIXME: sd_nlink is 32 bit for new files */ reiserfs_write_unlock(dir->i_sb); return -EMLINK; } @@ -1158,9 +1234,9 @@ static int de_still_valid(const char *name, int len, { struct reiserfs_dir_entry tmp = *de; - // recalculate pointer to name and name length + /* recalculate pointer to name and name length */ set_de_name_and_namelen(&tmp); - // FIXME: could check more + /* FIXME: could check more */ if (tmp.de_namelen != len || memcmp(name, de->de_name, len)) return 0; return 1; @@ -1217,14 +1293,16 @@ static int reiserfs_rename(struct inode *old_dir, struct dentry *old_dentry, unsigned long savelink = 1; struct timespec ctime; - /* three balancings: (1) old name removal, (2) new name insertion - and (3) maybe "save" link insertion - stat data updates: (1) old directory, - (2) new directory and (3) maybe old object stat data (when it is - directory) and (4) maybe stat data of object to which new entry - pointed initially and (5) maybe block containing ".." of - renamed directory - quota updates: two parent directories */ + /* + * three balancings: (1) old name removal, (2) new name insertion + * and (3) maybe "save" link insertion + * stat data updates: (1) old directory, + * (2) new directory and (3) maybe old object stat data (when it is + * directory) and (4) maybe stat data of object to which new entry + * pointed initially and (5) maybe block containing ".." of + * renamed directory + * quota updates: two parent directories + */ jbegin_count = JOURNAL_PER_BALANCE_CNT * 3 + 5 + 4 * REISERFS_QUOTA_TRANS_BLOCKS(old_dir->i_sb); @@ -1235,8 +1313,10 @@ static int reiserfs_rename(struct inode *old_dir, struct dentry *old_dentry, old_inode = old_dentry->d_inode; new_dentry_inode = new_dentry->d_inode; - // make sure, that oldname still exists and points to an object we - // are going to rename + /* + * make sure that oldname still exists and points to an object we + * are going to rename + */ old_de.de_gen_number_bit_string = NULL; reiserfs_write_lock(old_dir->i_sb); retval = @@ -1256,10 +1336,11 @@ static int reiserfs_rename(struct inode *old_dir, struct dentry *old_dentry, old_inode_mode = old_inode->i_mode; if (S_ISDIR(old_inode_mode)) { - // make sure, that directory being renamed has correct ".." - // and that its new parent directory has not too many links - // already - + /* + * make sure that directory being renamed has correct ".." + * and that its new parent directory has not too many links + * already + */ if (new_dentry_inode) { if (!reiserfs_empty_dir(new_dentry_inode)) { reiserfs_write_unlock(old_dir->i_sb); @@ -1267,8 +1348,9 @@ static int reiserfs_rename(struct inode *old_dir, struct dentry *old_dentry, } } - /* directory is renamed, its parent directory will be changed, - ** so find ".." entry + /* + * directory is renamed, its parent directory will be changed, + * so find ".." entry */ dot_dot_de.de_gen_number_bit_string = NULL; retval = @@ -1311,8 +1393,9 @@ static int reiserfs_rename(struct inode *old_dir, struct dentry *old_dentry, reiserfs_update_inode_transaction(old_dir); reiserfs_update_inode_transaction(new_dir); - /* this makes it so an fsync on an open fd for the old name will - ** commit the rename operation + /* + * this makes it so an fsync on an open fd for the old name will + * commit the rename operation */ reiserfs_update_inode_transaction(old_inode); @@ -1320,7 +1403,10 @@ static int reiserfs_rename(struct inode *old_dir, struct dentry *old_dentry, reiserfs_update_inode_transaction(new_dentry_inode); while (1) { - // look for old name using corresponding entry key (found by reiserfs_find_entry) + /* + * look for old name using corresponding entry key + * (found by reiserfs_find_entry) + */ if ((retval = search_by_entry_key(new_dir->i_sb, &old_de.de_entry_key, &old_entry_path, @@ -1335,14 +1421,18 @@ static int reiserfs_rename(struct inode *old_dir, struct dentry *old_dentry, reiserfs_prepare_for_journal(old_inode->i_sb, old_de.de_bh, 1); - // look for new name by reiserfs_find_entry + /* look for new name by reiserfs_find_entry */ new_de.de_gen_number_bit_string = NULL; retval = reiserfs_find_entry(new_dir, new_dentry->d_name.name, new_dentry->d_name.len, &new_entry_path, &new_de); - // reiserfs_add_entry should not return IO_ERROR, because it is called with essentially same parameters from - // reiserfs_add_entry above, and we'll catch any i/o errors before we get here. + /* + * reiserfs_add_entry should not return IO_ERROR, + * because it is called with essentially same parameters from + * reiserfs_add_entry above, and we'll catch any i/o errors + * before we get here. + */ if (retval != NAME_FOUND_INVISIBLE && retval != NAME_FOUND) { pathrelse(&new_entry_path); pathrelse(&old_entry_path); @@ -1370,22 +1460,26 @@ static int reiserfs_rename(struct inode *old_dir, struct dentry *old_dentry, } copy_item_head(&dot_dot_ih, tp_item_head(&dot_dot_entry_path)); - // node containing ".." gets into transaction + /* node containing ".." gets into transaction */ reiserfs_prepare_for_journal(old_inode->i_sb, dot_dot_de.de_bh, 1); } - /* we should check seals here, not do - this stuff, yes? Then, having - gathered everything into RAM we - should lock the buffers, yes? -Hans */ - /* probably. our rename needs to hold more - ** than one path at once. The seals would - ** have to be written to deal with multi-path - ** issues -chris + /* + * we should check seals here, not do + * this stuff, yes? Then, having + * gathered everything into RAM we + * should lock the buffers, yes? -Hans + */ + /* + * probably. our rename needs to hold more + * than one path at once. The seals would + * have to be written to deal with multi-path + * issues -chris */ - /* sanity checking before doing the rename - avoid races many - ** of the above checks could have scheduled. We have to be - ** sure our items haven't been shifted by another process. + /* + * sanity checking before doing the rename - avoid races many + * of the above checks could have scheduled. We have to be + * sure our items haven't been shifted by another process. */ if (item_moved(&new_entry_ih, &new_entry_path) || !entry_points_to_object(new_dentry->d_name.name, @@ -1430,8 +1524,10 @@ static int reiserfs_rename(struct inode *old_dir, struct dentry *old_dentry, break; } - /* ok, all the changes can be done in one fell swoop when we - have claimed all the buffers needed. */ + /* + * ok, all the changes can be done in one fell swoop when we + * have claimed all the buffers needed. + */ mark_de_visible(new_de.de_deh + new_de.de_entry_num); set_ino_in_dir_entry(&new_de, INODE_PKEY(old_inode)); @@ -1442,12 +1538,14 @@ static int reiserfs_rename(struct inode *old_dir, struct dentry *old_dentry, ctime = CURRENT_TIME_SEC; old_dir->i_ctime = old_dir->i_mtime = ctime; new_dir->i_ctime = new_dir->i_mtime = ctime; - /* thanks to Alex Adriaanse <alex_a@caltech.edu> for patch which adds ctime update of - renamed object */ + /* + * thanks to Alex Adriaanse <alex_a@caltech.edu> for patch + * which adds ctime update of renamed object + */ old_inode->i_ctime = ctime; if (new_dentry_inode) { - // adjust link number of the victim + /* adjust link number of the victim */ if (S_ISDIR(new_dentry_inode->i_mode)) { clear_nlink(new_dentry_inode); } else { @@ -1462,21 +1560,28 @@ static int reiserfs_rename(struct inode *old_dir, struct dentry *old_dentry, set_ino_in_dir_entry(&dot_dot_de, INODE_PKEY(new_dir)); journal_mark_dirty(&th, new_dir->i_sb, dot_dot_de.de_bh); + /* + * there (in new_dir) was no directory, so it got new link + * (".." of renamed directory) + */ if (!new_dentry_inode) - /* there (in new_dir) was no directory, so it got new link - (".." of renamed directory) */ INC_DIR_INODE_NLINK(new_dir); /* old directory lost one link - ".. " of renamed directory */ DEC_DIR_INODE_NLINK(old_dir); } - // looks like in 2.3.99pre3 brelse is atomic. so we can use pathrelse + /* + * looks like in 2.3.99pre3 brelse is atomic. + * so we can use pathrelse + */ pathrelse(&new_entry_path); pathrelse(&dot_dot_entry_path); - // FIXME: this reiserfs_cut_from_item's return value may screw up - // anybody, but it will panic if will not be able to find the - // entry. This needs one more clean up + /* + * FIXME: this reiserfs_cut_from_item's return value may screw up + * anybody, but it will panic if will not be able to find the + * entry. This needs one more clean up + */ if (reiserfs_cut_from_item (&th, &old_entry_path, &(old_de.de_entry_key), old_dir, NULL, 0) < 0) @@ -1501,11 +1606,8 @@ static int reiserfs_rename(struct inode *old_dir, struct dentry *old_dentry, return retval; } -/* - * directories can handle most operations... - */ +/* directories can handle most operations... */ const struct inode_operations reiserfs_dir_inode_operations = { - //&reiserfs_dir_operations, /* default_file_ops */ .create = reiserfs_create, .lookup = reiserfs_lookup, .link = reiserfs_link, diff --git a/fs/reiserfs/objectid.c b/fs/reiserfs/objectid.c index f732d6a5251d..99f66f885785 100644 --- a/fs/reiserfs/objectid.c +++ b/fs/reiserfs/objectid.c @@ -7,7 +7,7 @@ #include <linux/time.h> #include "reiserfs.h" -// find where objectid map starts +/* find where objectid map starts */ #define objectid_map(s,rs) (old_format_only (s) ? \ (__le32 *)((struct reiserfs_super_block_v1 *)(rs) + 1) :\ (__le32 *)((rs) + 1)) @@ -20,7 +20,7 @@ static void check_objectid_map(struct super_block *s, __le32 * map) reiserfs_panic(s, "vs-15010", "map corrupted: %lx", (long unsigned int)le32_to_cpu(map[0])); - // FIXME: add something else here + /* FIXME: add something else here */ } #else @@ -29,19 +29,21 @@ static void check_objectid_map(struct super_block *s, __le32 * map) } #endif -/* When we allocate objectids we allocate the first unused objectid. - Each sequence of objectids in use (the odd sequences) is followed - by a sequence of objectids not in use (the even sequences). We - only need to record the last objectid in each of these sequences - (both the odd and even sequences) in order to fully define the - boundaries of the sequences. A consequence of allocating the first - objectid not in use is that under most conditions this scheme is - extremely compact. The exception is immediately after a sequence - of operations which deletes a large number of objects of - non-sequential objectids, and even then it will become compact - again as soon as more objects are created. Note that many - interesting optimizations of layout could result from complicating - objectid assignment, but we have deferred making them for now. */ +/* + * When we allocate objectids we allocate the first unused objectid. + * Each sequence of objectids in use (the odd sequences) is followed + * by a sequence of objectids not in use (the even sequences). We + * only need to record the last objectid in each of these sequences + * (both the odd and even sequences) in order to fully define the + * boundaries of the sequences. A consequence of allocating the first + * objectid not in use is that under most conditions this scheme is + * extremely compact. The exception is immediately after a sequence + * of operations which deletes a large number of objects of + * non-sequential objectids, and even then it will become compact + * again as soon as more objects are created. Note that many + * interesting optimizations of layout could result from complicating + * objectid assignment, but we have deferred making them for now. + */ /* get unique object identifier */ __u32 reiserfs_get_unused_objectid(struct reiserfs_transaction_handle *th) @@ -64,19 +66,23 @@ __u32 reiserfs_get_unused_objectid(struct reiserfs_transaction_handle *th) return 0; } - /* This incrementation allocates the first unused objectid. That - is to say, the first entry on the objectid map is the first - unused objectid, and by incrementing it we use it. See below - where we check to see if we eliminated a sequence of unused - objectids.... */ + /* + * This incrementation allocates the first unused objectid. That + * is to say, the first entry on the objectid map is the first + * unused objectid, and by incrementing it we use it. See below + * where we check to see if we eliminated a sequence of unused + * objectids.... + */ map[1] = cpu_to_le32(unused_objectid + 1); - /* Now we check to see if we eliminated the last remaining member of - the first even sequence (and can eliminate the sequence by - eliminating its last objectid from oids), and can collapse the - first two odd sequences into one sequence. If so, then the net - result is to eliminate a pair of objectids from oids. We do this - by shifting the entire map to the left. */ + /* + * Now we check to see if we eliminated the last remaining member of + * the first even sequence (and can eliminate the sequence by + * eliminating its last objectid from oids), and can collapse the + * first two odd sequences into one sequence. If so, then the net + * result is to eliminate a pair of objectids from oids. We do this + * by shifting the entire map to the left. + */ if (sb_oid_cursize(rs) > 2 && map[1] == map[2]) { memmove(map + 1, map + 3, (sb_oid_cursize(rs) - 3) * sizeof(__u32)); @@ -97,30 +103,33 @@ void reiserfs_release_objectid(struct reiserfs_transaction_handle *th, int i = 0; BUG_ON(!th->t_trans_id); - //return; + /*return; */ check_objectid_map(s, map); reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1); journal_mark_dirty(th, s, SB_BUFFER_WITH_SB(s)); - /* start at the beginning of the objectid map (i = 0) and go to - the end of it (i = disk_sb->s_oid_cursize). Linear search is - what we use, though it is possible that binary search would be - more efficient after performing lots of deletions (which is - when oids is large.) We only check even i's. */ + /* + * start at the beginning of the objectid map (i = 0) and go to + * the end of it (i = disk_sb->s_oid_cursize). Linear search is + * what we use, though it is possible that binary search would be + * more efficient after performing lots of deletions (which is + * when oids is large.) We only check even i's. + */ while (i < sb_oid_cursize(rs)) { if (objectid_to_release == le32_to_cpu(map[i])) { /* This incrementation unallocates the objectid. */ - //map[i]++; le32_add_cpu(&map[i], 1); - /* Did we unallocate the last member of an odd sequence, and can shrink oids? */ + /* + * Did we unallocate the last member of an + * odd sequence, and can shrink oids? + */ if (map[i] == map[i + 1]) { /* shrink objectid map */ memmove(map + i, map + i + 2, (sb_oid_cursize(rs) - i - 2) * sizeof(__u32)); - //disk_sb->s_oid_cursize -= 2; set_sb_oid_cursize(rs, sb_oid_cursize(rs) - 2); RFALSE(sb_oid_cursize(rs) < 2 || @@ -135,14 +144,19 @@ void reiserfs_release_objectid(struct reiserfs_transaction_handle *th, objectid_to_release < le32_to_cpu(map[i + 1])) { /* size of objectid map is not changed */ if (objectid_to_release + 1 == le32_to_cpu(map[i + 1])) { - //objectid_map[i+1]--; le32_add_cpu(&map[i + 1], -1); return; } - /* JDM comparing two little-endian values for equality -- safe */ + /* + * JDM comparing two little-endian values for + * equality -- safe + */ + /* + * objectid map must be expanded, but + * there is no space + */ if (sb_oid_cursize(rs) == sb_oid_maxsize(rs)) { - /* objectid map must be expanded, but there is no space */ PROC_INFO_INC(s, leaked_oid); return; } @@ -178,8 +192,9 @@ int reiserfs_convert_objectid_map_v1(struct super_block *s) new_objectid_map = (__le32 *) (disk_sb + 1); if (cur_size > new_size) { - /* mark everyone used that was listed as free at the end of the objectid - ** map + /* + * mark everyone used that was listed as free at + * the end of the objectid map */ objectid_map[new_size - 1] = objectid_map[cur_size - 1]; set_sb_oid_cursize(disk_sb, new_size); diff --git a/fs/reiserfs/prints.c b/fs/reiserfs/prints.c index 41f788148d44..c7425fdf19f9 100644 --- a/fs/reiserfs/prints.c +++ b/fs/reiserfs/prints.c @@ -172,18 +172,19 @@ static char *is_there_reiserfs_struct(char *fmt, int *what) return k; } -/* debugging reiserfs we used to print out a lot of different - variables, like keys, item headers, buffer heads etc. Values of - most fields matter. So it took a long time just to write - appropriative printk. With this reiserfs_warning you can use format - specification for complex structures like you used to do with - printfs for integers, doubles and pointers. For instance, to print - out key structure you have to write just: - reiserfs_warning ("bad key %k", key); - instead of - printk ("bad key %lu %lu %lu %lu", key->k_dir_id, key->k_objectid, - key->k_offset, key->k_uniqueness); -*/ +/* + * debugging reiserfs we used to print out a lot of different + * variables, like keys, item headers, buffer heads etc. Values of + * most fields matter. So it took a long time just to write + * appropriative printk. With this reiserfs_warning you can use format + * specification for complex structures like you used to do with + * printfs for integers, doubles and pointers. For instance, to print + * out key structure you have to write just: + * reiserfs_warning ("bad key %k", key); + * instead of + * printk ("bad key %lu %lu %lu %lu", key->k_dir_id, key->k_objectid, + * key->k_offset, key->k_uniqueness); + */ static DEFINE_SPINLOCK(error_lock); static void prepare_error_buf(const char *fmt, va_list args) { @@ -243,15 +244,16 @@ static void prepare_error_buf(const char *fmt, va_list args) } -/* in addition to usual conversion specifiers this accepts reiserfs - specific conversion specifiers: - %k to print little endian key, - %K to print cpu key, - %h to print item_head, - %t to print directory entry - %z to print block head (arg must be struct buffer_head * - %b to print buffer_head -*/ +/* + * in addition to usual conversion specifiers this accepts reiserfs + * specific conversion specifiers: + * %k to print little endian key, + * %K to print cpu key, + * %h to print item_head, + * %t to print directory entry + * %z to print block head (arg must be struct buffer_head * + * %b to print buffer_head + */ #define do_reiserfs_warning(fmt)\ {\ @@ -304,50 +306,52 @@ void reiserfs_debug(struct super_block *s, int level, const char *fmt, ...) #endif } -/* The format: - - maintainer-errorid: [function-name:] message - - where errorid is unique to the maintainer and function-name is - optional, is recommended, so that anyone can easily find the bug - with a simple grep for the short to type string - maintainer-errorid. Don't bother with reusing errorids, there are - lots of numbers out there. - - Example: - - reiserfs_panic( - p_sb, "reiser-29: reiserfs_new_blocknrs: " - "one of search_start or rn(%d) is equal to MAX_B_NUM," - "which means that we are optimizing location based on the bogus location of a temp buffer (%p).", - rn, bh - ); - - Regular panic()s sometimes clear the screen before the message can - be read, thus the need for the while loop. - - Numbering scheme for panic used by Vladimir and Anatoly( Hans completely ignores this scheme, and considers it - pointless complexity): - - panics in reiserfs.h have numbers from 1000 to 1999 - super.c 2000 to 2999 - preserve.c (unused) 3000 to 3999 - bitmap.c 4000 to 4999 - stree.c 5000 to 5999 - prints.c 6000 to 6999 - namei.c 7000 to 7999 - fix_nodes.c 8000 to 8999 - dir.c 9000 to 9999 - lbalance.c 10000 to 10999 - ibalance.c 11000 to 11999 not ready - do_balan.c 12000 to 12999 - inode.c 13000 to 13999 - file.c 14000 to 14999 - objectid.c 15000 - 15999 - buffer.c 16000 - 16999 - symlink.c 17000 - 17999 - - . */ +/* + * The format: + * + * maintainer-errorid: [function-name:] message + * + * where errorid is unique to the maintainer and function-name is + * optional, is recommended, so that anyone can easily find the bug + * with a simple grep for the short to type string + * maintainer-errorid. Don't bother with reusing errorids, there are + * lots of numbers out there. + * + * Example: + * + * reiserfs_panic( + * p_sb, "reiser-29: reiserfs_new_blocknrs: " + * "one of search_start or rn(%d) is equal to MAX_B_NUM," + * "which means that we are optimizing location based on the " + * "bogus location of a temp buffer (%p).", + * rn, bh + * ); + * + * Regular panic()s sometimes clear the screen before the message can + * be read, thus the need for the while loop. + * + * Numbering scheme for panic used by Vladimir and Anatoly( Hans completely + * ignores this scheme, and considers it pointless complexity): + * + * panics in reiserfs_fs.h have numbers from 1000 to 1999 + * super.c 2000 to 2999 + * preserve.c (unused) 3000 to 3999 + * bitmap.c 4000 to 4999 + * stree.c 5000 to 5999 + * prints.c 6000 to 6999 + * namei.c 7000 to 7999 + * fix_nodes.c 8000 to 8999 + * dir.c 9000 to 9999 + * lbalance.c 10000 to 10999 + * ibalance.c 11000 to 11999 not ready + * do_balan.c 12000 to 12999 + * inode.c 13000 to 13999 + * file.c 14000 to 14999 + * objectid.c 15000 - 15999 + * buffer.c 16000 - 16999 + * symlink.c 17000 - 17999 + * + * . */ void __reiserfs_panic(struct super_block *sb, const char *id, const char *function, const char *fmt, ...) @@ -411,9 +415,11 @@ void reiserfs_abort(struct super_block *sb, int errno, const char *fmt, ...) reiserfs_abort_journal(sb, errno); } -/* this prints internal nodes (4 keys/items in line) (dc_number, - dc_size)[k_dirid, k_objectid, k_offset, k_uniqueness](dc_number, - dc_size)...*/ +/* + * this prints internal nodes (4 keys/items in line) (dc_number, + * dc_size)[k_dirid, k_objectid, k_offset, k_uniqueness](dc_number, + * dc_size)... + */ static int print_internal(struct buffer_head *bh, int first, int last) { struct reiserfs_key *key; @@ -543,9 +549,11 @@ static int print_super_block(struct buffer_head *bh) printk("Block count %u\n", sb_block_count(rs)); printk("Blocksize %d\n", sb_blocksize(rs)); printk("Free blocks %u\n", sb_free_blocks(rs)); - // FIXME: this would be confusing if - // someone stores reiserfs super block in some data block ;) + /* + * FIXME: this would be confusing if + * someone stores reiserfs super block in some data block ;) // skipped = (bh->b_blocknr * bh->b_size) / sb_blocksize(rs); + */ skipped = bh->b_blocknr; data_blocks = sb_block_count(rs) - skipped - 1 - sb_bmap_nr(rs) - (!is_reiserfs_jr(rs) ? sb_jp_journal_size(rs) + @@ -581,8 +589,8 @@ static int print_desc_block(struct buffer_head *bh) return 0; } - -void print_block(struct buffer_head *bh, ...) //int print_mode, int first, int last) +/* ..., int print_mode, int first, int last) */ +void print_block(struct buffer_head *bh, ...) { va_list args; int mode, first, last; diff --git a/fs/reiserfs/reiserfs.h b/fs/reiserfs/reiserfs.h index 35bfde10ca0f..2195e7f2297f 100644 --- a/fs/reiserfs/reiserfs.h +++ b/fs/reiserfs/reiserfs.h @@ -1,5 +1,6 @@ /* - * Copyright 1996, 1997, 1998 Hans Reiser, see reiserfs/README for licensing and copyright details + * Copyright 1996, 1997, 1998 Hans Reiser, see reiserfs/README for + * licensing and copyright details */ #include <linux/reiserfs_fs.h> @@ -23,52 +24,73 @@ struct reiserfs_journal_list; -/** bitmasks for i_flags field in reiserfs-specific part of inode */ +/* bitmasks for i_flags field in reiserfs-specific part of inode */ typedef enum { - /** this says what format of key do all items (but stat data) of - an object have. If this is set, that format is 3.6 otherwise - - 3.5 */ + /* + * this says what format of key do all items (but stat data) of + * an object have. If this is set, that format is 3.6 otherwise - 3.5 + */ i_item_key_version_mask = 0x0001, - /** If this is unset, object has 3.5 stat data, otherwise, it has - 3.6 stat data with 64bit size, 32bit nlink etc. */ + + /* + * If this is unset, object has 3.5 stat data, otherwise, + * it has 3.6 stat data with 64bit size, 32bit nlink etc. + */ i_stat_data_version_mask = 0x0002, - /** file might need tail packing on close */ + + /* file might need tail packing on close */ i_pack_on_close_mask = 0x0004, - /** don't pack tail of file */ + + /* don't pack tail of file */ i_nopack_mask = 0x0008, - /** If those is set, "safe link" was created for this file during - truncate or unlink. Safe link is used to avoid leakage of disk - space on crash with some files open, but unlinked. */ + + /* + * If either of these are set, "safe link" was created for this + * file during truncate or unlink. Safe link is used to avoid + * leakage of disk space on crash with some files open, but unlinked. + */ i_link_saved_unlink_mask = 0x0010, i_link_saved_truncate_mask = 0x0020, + i_has_xattr_dir = 0x0040, i_data_log = 0x0080, } reiserfs_inode_flags; struct reiserfs_inode_info { __u32 i_key[4]; /* key is still 4 32 bit integers */ - /** transient inode flags that are never stored on disk. Bitmasks - for this field are defined above. */ + + /* + * transient inode flags that are never stored on disk. Bitmasks + * for this field are defined above. + */ __u32 i_flags; - __u32 i_first_direct_byte; // offset of first byte stored in direct item. + /* offset of first byte stored in direct item. */ + __u32 i_first_direct_byte; /* copy of persistent inode flags read from sd_attrs. */ __u32 i_attrs; - int i_prealloc_block; /* first unused block of a sequence of unused blocks */ + /* first unused block of a sequence of unused blocks */ + int i_prealloc_block; int i_prealloc_count; /* length of that sequence */ - struct list_head i_prealloc_list; /* per-transaction list of inodes which - * have preallocated blocks */ - unsigned new_packing_locality:1; /* new_packig_locality is created; new blocks - * for the contents of this directory should be - * displaced */ + /* per-transaction list of inodes which have preallocated blocks */ + struct list_head i_prealloc_list; + + /* + * new_packing_locality is created; new blocks for the contents + * of this directory should be displaced + */ + unsigned new_packing_locality:1; - /* we use these for fsync or O_SYNC to decide which transaction - ** needs to be committed in order for this inode to be properly - ** flushed */ + /* + * we use these for fsync or O_SYNC to decide which transaction + * needs to be committed in order for this inode to be properly + * flushed + */ unsigned int i_trans_id; + struct reiserfs_journal_list *i_jl; atomic_t openers; struct mutex tailpack; @@ -82,9 +104,10 @@ typedef enum { reiserfs_attrs_cleared = 0x00000001, } reiserfs_super_block_flags; -/* struct reiserfs_super_block accessors/mutators - * since this is a disk structure, it will always be in - * little endian format. */ +/* + * struct reiserfs_super_block accessors/mutators since this is a disk + * structure, it will always be in little endian format. + */ #define sb_block_count(sbp) (le32_to_cpu((sbp)->s_v1.s_block_count)) #define set_sb_block_count(sbp,v) ((sbp)->s_v1.s_block_count = cpu_to_le32(v)) #define sb_free_blocks(sbp) (le32_to_cpu((sbp)->s_v1.s_free_blocks)) @@ -152,48 +175,61 @@ typedef enum { /* LOGGING -- */ -/* These all interelate for performance. -** -** If the journal block count is smaller than n transactions, you lose speed. -** I don't know what n is yet, I'm guessing 8-16. -** -** typical transaction size depends on the application, how often fsync is -** called, and how many metadata blocks you dirty in a 30 second period. -** The more small files (<16k) you use, the larger your transactions will -** be. -** -** If your journal fills faster than dirty buffers get flushed to disk, it must flush them before allowing the journal -** to wrap, which slows things down. If you need high speed meta data updates, the journal should be big enough -** to prevent wrapping before dirty meta blocks get to disk. -** -** If the batch max is smaller than the transaction max, you'll waste space at the end of the journal -** because journal_end sets the next transaction to start at 0 if the next transaction has any chance of wrapping. -** -** The large the batch max age, the better the speed, and the more meta data changes you'll lose after a crash. -** -*/ +/* + * These all interelate for performance. + * + * If the journal block count is smaller than n transactions, you lose speed. + * I don't know what n is yet, I'm guessing 8-16. + * + * typical transaction size depends on the application, how often fsync is + * called, and how many metadata blocks you dirty in a 30 second period. + * The more small files (<16k) you use, the larger your transactions will + * be. + * + * If your journal fills faster than dirty buffers get flushed to disk, it + * must flush them before allowing the journal to wrap, which slows things + * down. If you need high speed meta data updates, the journal should be + * big enough to prevent wrapping before dirty meta blocks get to disk. + * + * If the batch max is smaller than the transaction max, you'll waste space + * at the end of the journal because journal_end sets the next transaction + * to start at 0 if the next transaction has any chance of wrapping. + * + * The large the batch max age, the better the speed, and the more meta + * data changes you'll lose after a crash. + */ /* don't mess with these for a while */ - /* we have a node size define somewhere in reiserfs_fs.h. -Hans */ +/* we have a node size define somewhere in reiserfs_fs.h. -Hans */ #define JOURNAL_BLOCK_SIZE 4096 /* BUG gotta get rid of this */ #define JOURNAL_MAX_CNODE 1500 /* max cnodes to allocate. */ #define JOURNAL_HASH_SIZE 8192 -#define JOURNAL_NUM_BITMAPS 5 /* number of copies of the bitmaps to have floating. Must be >= 2 */ - -/* One of these for every block in every transaction -** Each one is in two hash tables. First, a hash of the current transaction, and after journal_end, a -** hash of all the in memory transactions. -** next and prev are used by the current transaction (journal_hash). -** hnext and hprev are used by journal_list_hash. If a block is in more than one transaction, the journal_list_hash -** links it in multiple times. This allows flush_journal_list to remove just the cnode belonging -** to a given transaction. -*/ + +/* number of copies of the bitmaps to have floating. Must be >= 2 */ +#define JOURNAL_NUM_BITMAPS 5 + +/* + * One of these for every block in every transaction + * Each one is in two hash tables. First, a hash of the current transaction, + * and after journal_end, a hash of all the in memory transactions. + * next and prev are used by the current transaction (journal_hash). + * hnext and hprev are used by journal_list_hash. If a block is in more + * than one transaction, the journal_list_hash links it in multiple times. + * This allows flush_journal_list to remove just the cnode belonging to a + * given transaction. + */ struct reiserfs_journal_cnode { struct buffer_head *bh; /* real buffer head */ struct super_block *sb; /* dev of real buffer head */ - __u32 blocknr; /* block number of real buffer head, == 0 when buffer on disk */ + + /* block number of real buffer head, == 0 when buffer on disk */ + __u32 blocknr; + unsigned long state; - struct reiserfs_journal_list *jlist; /* journal list this cnode lives in */ + + /* journal list this cnode lives in */ + struct reiserfs_journal_list *jlist; + struct reiserfs_journal_cnode *next; /* next in transaction list */ struct reiserfs_journal_cnode *prev; /* prev in transaction list */ struct reiserfs_journal_cnode *hprev; /* prev in hash list */ @@ -212,18 +248,22 @@ struct reiserfs_list_bitmap { }; /* -** one of these for each transaction. The most important part here is the j_realblock. -** this list of cnodes is used to hash all the blocks in all the commits, to mark all the -** real buffer heads dirty once all the commits hit the disk, -** and to make sure every real block in a transaction is on disk before allowing the log area -** to be overwritten */ + * one of these for each transaction. The most important part here is the + * j_realblock. this list of cnodes is used to hash all the blocks in all + * the commits, to mark all the real buffer heads dirty once all the commits + * hit the disk, and to make sure every real block in a transaction is on + * disk before allowing the log area to be overwritten + */ struct reiserfs_journal_list { unsigned long j_start; unsigned long j_state; unsigned long j_len; atomic_t j_nonzerolen; atomic_t j_commit_left; - atomic_t j_older_commits_done; /* all commits older than this on disk */ + + /* all commits older than this on disk */ + atomic_t j_older_commits_done; + struct mutex j_commit_mutex; unsigned int j_trans_id; time_t j_timestamp; @@ -234,11 +274,15 @@ struct reiserfs_journal_list { /* time ordered list of all active transactions */ struct list_head j_list; - /* time ordered list of all transactions we haven't tried to flush yet */ + /* + * time ordered list of all transactions we haven't tried + * to flush yet + */ struct list_head j_working_list; /* list of tail conversion targets in need of flush before commit */ struct list_head j_tail_bh_list; + /* list of data=ordered buffers in need of flush before commit */ struct list_head j_bh_list; int j_refcount; @@ -246,46 +290,83 @@ struct reiserfs_journal_list { struct reiserfs_journal { struct buffer_head **j_ap_blocks; /* journal blocks on disk */ - struct reiserfs_journal_cnode *j_last; /* newest journal block */ - struct reiserfs_journal_cnode *j_first; /* oldest journal block. start here for traverse */ + /* newest journal block */ + struct reiserfs_journal_cnode *j_last; + + /* oldest journal block. start here for traverse */ + struct reiserfs_journal_cnode *j_first; struct block_device *j_dev_bd; fmode_t j_dev_mode; - int j_1st_reserved_block; /* first block on s_dev of reserved area journal */ + + /* first block on s_dev of reserved area journal */ + int j_1st_reserved_block; unsigned long j_state; unsigned int j_trans_id; unsigned long j_mount_id; - unsigned long j_start; /* start of current waiting commit (index into j_ap_blocks) */ + + /* start of current waiting commit (index into j_ap_blocks) */ + unsigned long j_start; unsigned long j_len; /* length of current waiting commit */ - unsigned long j_len_alloc; /* number of buffers requested by journal_begin() */ + + /* number of buffers requested by journal_begin() */ + unsigned long j_len_alloc; + atomic_t j_wcount; /* count of writers for current commit */ - unsigned long j_bcount; /* batch count. allows turning X transactions into 1 */ - unsigned long j_first_unflushed_offset; /* first unflushed transactions offset */ - unsigned j_last_flush_trans_id; /* last fully flushed journal timestamp */ + + /* batch count. allows turning X transactions into 1 */ + unsigned long j_bcount; + + /* first unflushed transactions offset */ + unsigned long j_first_unflushed_offset; + + /* last fully flushed journal timestamp */ + unsigned j_last_flush_trans_id; + struct buffer_head *j_header_bh; time_t j_trans_start_time; /* time this transaction started */ struct mutex j_mutex; struct mutex j_flush_mutex; - wait_queue_head_t j_join_wait; /* wait for current transaction to finish before starting new one */ - atomic_t j_jlock; /* lock for j_join_wait */ + + /* wait for current transaction to finish before starting new one */ + wait_queue_head_t j_join_wait; + + atomic_t j_jlock; /* lock for j_join_wait */ int j_list_bitmap_index; /* number of next list bitmap to use */ - int j_must_wait; /* no more journal begins allowed. MUST sleep on j_join_wait */ - int j_next_full_flush; /* next journal_end will flush all journal list */ - int j_next_async_flush; /* next journal_end will flush all async commits */ + + /* no more journal begins allowed. MUST sleep on j_join_wait */ + int j_must_wait; + + /* next journal_end will flush all journal list */ + int j_next_full_flush; + + /* next journal_end will flush all async commits */ + int j_next_async_flush; int j_cnode_used; /* number of cnodes on the used list */ int j_cnode_free; /* number of cnodes on the free list */ - unsigned int j_trans_max; /* max number of blocks in a transaction. */ - unsigned int j_max_batch; /* max number of blocks to batch into a trans */ - unsigned int j_max_commit_age; /* in seconds, how old can an async commit be */ - unsigned int j_max_trans_age; /* in seconds, how old can a transaction be */ - unsigned int j_default_max_commit_age; /* the default for the max commit age */ + /* max number of blocks in a transaction. */ + unsigned int j_trans_max; + + /* max number of blocks to batch into a trans */ + unsigned int j_max_batch; + + /* in seconds, how old can an async commit be */ + unsigned int j_max_commit_age; + + /* in seconds, how old can a transaction be */ + unsigned int j_max_trans_age; + + /* the default for the max commit age */ + unsigned int j_default_max_commit_age; struct reiserfs_journal_cnode *j_cnode_free_list; - struct reiserfs_journal_cnode *j_cnode_free_orig; /* orig pointer returned from vmalloc */ + + /* orig pointer returned from vmalloc */ + struct reiserfs_journal_cnode *j_cnode_free_orig; struct reiserfs_journal_list *j_current_jl; int j_free_bitmap_nodes; @@ -306,14 +387,21 @@ struct reiserfs_journal { /* list of all active transactions */ struct list_head j_journal_list; + /* lists that haven't been touched by writeback attempts */ struct list_head j_working_list; - struct reiserfs_list_bitmap j_list_bitmap[JOURNAL_NUM_BITMAPS]; /* array of bitmaps to record the deleted blocks */ - struct reiserfs_journal_cnode *j_hash_table[JOURNAL_HASH_SIZE]; /* hash table for real buffer heads in current trans */ - struct reiserfs_journal_cnode *j_list_hash_table[JOURNAL_HASH_SIZE]; /* hash table for all the real buffer heads in all - the transactions */ - struct list_head j_prealloc_list; /* list of inodes which have preallocated blocks */ + /* hash table for real buffer heads in current trans */ + struct reiserfs_journal_cnode *j_hash_table[JOURNAL_HASH_SIZE]; + + /* hash table for all the real buffer heads in all the transactions */ + struct reiserfs_journal_cnode *j_list_hash_table[JOURNAL_HASH_SIZE]; + + /* array of bitmaps to record the deleted blocks */ + struct reiserfs_list_bitmap j_list_bitmap[JOURNAL_NUM_BITMAPS]; + + /* list of inodes which have preallocated blocks */ + struct list_head j_prealloc_list; int j_persistent_trans; unsigned long j_max_trans_size; unsigned long j_max_batch_size; @@ -328,11 +416,12 @@ struct reiserfs_journal { enum journal_state_bits { J_WRITERS_BLOCKED = 1, /* set when new writers not allowed */ - J_WRITERS_QUEUED, /* set when log is full due to too many writers */ - J_ABORTED, /* set when log is aborted */ + J_WRITERS_QUEUED, /* set when log is full due to too many writers */ + J_ABORTED, /* set when log is aborted */ }; -#define JOURNAL_DESC_MAGIC "ReIsErLB" /* ick. magic string to find desc blocks in the journal */ +/* ick. magic string to find desc blocks in the journal */ +#define JOURNAL_DESC_MAGIC "ReIsErLB" typedef __u32(*hashf_t) (const signed char *, int); @@ -364,7 +453,10 @@ typedef struct reiserfs_proc_info_data { stat_cnt_t leaked_oid; stat_cnt_t leaves_removable; - /* balances per level. Use explicit 5 as MAX_HEIGHT is not visible yet. */ + /* + * balances per level. + * Use explicit 5 as MAX_HEIGHT is not visible yet. + */ stat_cnt_t balance_at[5]; /* XXX */ /* sbk == search_by_key */ stat_cnt_t sbk_read_at[5]; /* XXX */ @@ -416,18 +508,24 @@ typedef struct reiserfs_proc_info_data { /* reiserfs union of in-core super block data */ struct reiserfs_sb_info { - struct buffer_head *s_sbh; /* Buffer containing the super block */ - /* both the comment and the choice of - name are unclear for s_rs -Hans */ - struct reiserfs_super_block *s_rs; /* Pointer to the super block in the buffer */ + /* Buffer containing the super block */ + struct buffer_head *s_sbh; + + /* Pointer to the on-disk super block in the buffer */ + struct reiserfs_super_block *s_rs; struct reiserfs_bitmap_info *s_ap_bitmap; - struct reiserfs_journal *s_journal; /* pointer to journal information */ + + /* pointer to journal information */ + struct reiserfs_journal *s_journal; + unsigned short s_mount_state; /* reiserfs state (valid, invalid) */ /* Serialize writers access, replace the old bkl */ struct mutex lock; + /* Owner of the lock (can be recursive) */ struct task_struct *lock_owner; + /* Depth of the lock, start from -1 like the bkl */ int lock_depth; @@ -435,30 +533,50 @@ struct reiserfs_sb_info { /* Comment? -Hans */ void (*end_io_handler) (struct buffer_head *, int); - hashf_t s_hash_function; /* pointer to function which is used - to sort names in directory. Set on - mount */ - unsigned long s_mount_opt; /* reiserfs's mount options are set - here (currently - NOTAIL, NOLOG, - REPLAYONLY) */ - - struct { /* This is a structure that describes block allocator options */ - unsigned long bits; /* Bitfield for enable/disable kind of options */ - unsigned long large_file_size; /* size started from which we consider file to be a large one(in blocks) */ + + /* + * pointer to function which is used to sort names in directory. + * Set on mount + */ + hashf_t s_hash_function; + + /* reiserfs's mount options are set here */ + unsigned long s_mount_opt; + + /* This is a structure that describes block allocator options */ + struct { + /* Bitfield for enable/disable kind of options */ + unsigned long bits; + + /* + * size started from which we consider file + * to be a large one (in blocks) + */ + unsigned long large_file_size; + int border; /* percentage of disk, border takes */ - int preallocmin; /* Minimal file size (in blocks) starting from which we do preallocations */ - int preallocsize; /* Number of blocks we try to prealloc when file - reaches preallocmin size (in blocks) or - prealloc_list is empty. */ + + /* + * Minimal file size (in blocks) starting + * from which we do preallocations + */ + int preallocmin; + + /* + * Number of blocks we try to prealloc when file + * reaches preallocmin size (in blocks) or prealloc_list + is empty. + */ + int preallocsize; } s_alloc_options; /* Comment? -Hans */ wait_queue_head_t s_wait; - /* To be obsoleted soon by per buffer seals.. -Hans */ - atomic_t s_generation_counter; // increased by one every time the - // tree gets re-balanced - unsigned long s_properties; /* File system properties. Currently holds - on-disk FS format */ + /* increased by one every time the tree gets re-balanced */ + atomic_t s_generation_counter; + + /* File system properties. Currently holds on-disk FS format */ + unsigned long s_properties; /* session statistics */ int s_disk_reads; @@ -471,14 +589,23 @@ struct reiserfs_sb_info { int s_bmaps_without_search; int s_direct2indirect; int s_indirect2direct; - /* set up when it's ok for reiserfs_read_inode2() to read from - disk inode with nlink==0. Currently this is only used during - finish_unfinished() processing at mount time */ + + /* + * set up when it's ok for reiserfs_read_inode2() to read from + * disk inode with nlink==0. Currently this is only used during + * finish_unfinished() processing at mount time + */ int s_is_unlinked_ok; + reiserfs_proc_info_data_t s_proc_info_data; struct proc_dir_entry *procdir; - int reserved_blocks; /* amount of blocks reserved for further allocations */ - spinlock_t bitmap_lock; /* this lock on now only used to protect reserved_blocks variable */ + + /* amount of blocks reserved for further allocations */ + int reserved_blocks; + + + /* this lock on now only used to protect reserved_blocks variable */ + spinlock_t bitmap_lock; struct dentry *priv_root; /* root of /.reiserfs_priv */ struct dentry *xattr_root; /* root of /.reiserfs_priv/xattrs */ int j_errno; @@ -494,14 +621,13 @@ struct reiserfs_sb_info { char *s_jdev; /* Stored jdev for mount option showing */ #ifdef CONFIG_REISERFS_CHECK - struct tree_balance *cur_tb; /* - * Detects whether more than one - * copy of tb exists per superblock - * as a means of checking whether - * do_balance is executing concurrently - * against another tree reader/writer - * on a same mount point. - */ + /* + * Detects whether more than one copy of tb exists per superblock + * as a means of checking whether do_balance is executing + * concurrently against another tree reader/writer on a same + * mount point. + */ + struct tree_balance *cur_tb; #endif }; @@ -510,25 +636,36 @@ struct reiserfs_sb_info { #define REISERFS_3_6 1 #define REISERFS_OLD_FORMAT 2 -enum reiserfs_mount_options { /* Mount options */ - REISERFS_LARGETAIL, /* large tails will be created in a session */ - REISERFS_SMALLTAIL, /* small (for files less than block size) tails will be created in a session */ - REPLAYONLY, /* replay journal and return 0. Use by fsck */ - REISERFS_CONVERT, /* -o conv: causes conversion of old - format super block to the new - format. If not specified - old - partition will be dealt with in a - manner of 3.5.x */ - -/* -o hash={tea, rupasov, r5, detect} is meant for properly mounting -** reiserfs disks from 3.5.19 or earlier. 99% of the time, this option -** is not required. If the normal autodection code can't determine which -** hash to use (because both hashes had the same value for a file) -** use this option to force a specific hash. It won't allow you to override -** the existing hash on the FS, so if you have a tea hash disk, and mount -** with -o hash=rupasov, the mount will fail. -*/ +enum reiserfs_mount_options { + /* large tails will be created in a session */ + REISERFS_LARGETAIL, + /* + * small (for files less than block size) tails will + * be created in a session + */ + REISERFS_SMALLTAIL, + + /* replay journal and return 0. Use by fsck */ + REPLAYONLY, + + /* + * -o conv: causes conversion of old format super block to the + * new format. If not specified - old partition will be dealt + * with in a manner of 3.5.x + */ + REISERFS_CONVERT, + + /* + * -o hash={tea, rupasov, r5, detect} is meant for properly mounting + * reiserfs disks from 3.5.19 or earlier. 99% of the time, this + * option is not required. If the normal autodection code can't + * determine which hash to use (because both hashes had the same + * value for a file) use this option to force a specific hash. + * It won't allow you to override the existing hash on the FS, so + * if you have a tea hash disk, and mount with -o hash=rupasov, + * the mount will fail. + */ FORCE_TEA_HASH, /* try to force tea hash on mount */ FORCE_RUPASOV_HASH, /* try to force rupasov hash on mount */ FORCE_R5_HASH, /* try to force rupasov hash on mount */ @@ -538,9 +675,11 @@ enum reiserfs_mount_options { REISERFS_DATA_ORDERED, REISERFS_DATA_WRITEBACK, -/* used for testing experimental features, makes benchmarking new - features with and without more convenient, should never be used by - users in any code shipped to users (ideally) */ + /* + * used for testing experimental features, makes benchmarking new + * features with and without more convenient, should never be used by + * users in any code shipped to users (ideally) + */ REISERFS_NO_BORDER, REISERFS_NO_UNHASHED_RELOCATION, @@ -707,28 +846,28 @@ static inline void reiserfs_cond_resched(struct super_block *s) struct fid; -/* in reading the #defines, it may help to understand that they employ - the following abbreviations: - - B = Buffer - I = Item header - H = Height within the tree (should be changed to LEV) - N = Number of the item in the node - STAT = stat data - DEH = Directory Entry Header - EC = Entry Count - E = Entry number - UL = Unsigned Long - BLKH = BLocK Header - UNFM = UNForMatted node - DC = Disk Child - P = Path - - These #defines are named by concatenating these abbreviations, - where first comes the arguments, and last comes the return value, - of the macro. - -*/ +/* + * in reading the #defines, it may help to understand that they employ + * the following abbreviations: + * + * B = Buffer + * I = Item header + * H = Height within the tree (should be changed to LEV) + * N = Number of the item in the node + * STAT = stat data + * DEH = Directory Entry Header + * EC = Entry Count + * E = Entry number + * UL = Unsigned Long + * BLKH = BLocK Header + * UNFM = UNForMatted node + * DC = Disk Child + * P = Path + * + * These #defines are named by concatenating these abbreviations, + * where first comes the arguments, and last comes the return value, + * of the macro. + */ #define USE_INODE_GENERATION_COUNTER @@ -739,14 +878,17 @@ struct fid; /* n must be power of 2 */ #define _ROUND_UP(x,n) (((x)+(n)-1u) & ~((n)-1u)) -// to be ok for alpha and others we have to align structures to 8 byte -// boundary. -// FIXME: do not change 4 by anything else: there is code which relies on that +/* + * to be ok for alpha and others we have to align structures to 8 byte + * boundary. + * FIXME: do not change 4 by anything else: there is code which relies on that + */ #define ROUND_UP(x) _ROUND_UP(x,8LL) -/* debug levels. Right now, CONFIG_REISERFS_CHECK means print all debug -** messages. -*/ +/* + * debug levels. Right now, CONFIG_REISERFS_CHECK means print all debug + * messages. + */ #define REISERFS_DEBUG_CODE 5 /* extra messages to help find/debug errors */ void __reiserfs_warning(struct super_block *s, const char *id, @@ -755,7 +897,7 @@ void __reiserfs_warning(struct super_block *s, const char *id, __reiserfs_warning(s, id, __func__, fmt, ##args) /* assertions handling */ -/** always check a condition and panic if it's false. */ +/* always check a condition and panic if it's false. */ #define __RASSERT(cond, scond, format, args...) \ do { \ if (!(cond)) \ @@ -778,35 +920,48 @@ do { \ * Disk Data Structures */ -/***************************************************************************/ -/* SUPER BLOCK */ -/***************************************************************************/ +/*************************************************************************** + * SUPER BLOCK * + ***************************************************************************/ /* - * Structure of super block on disk, a version of which in RAM is often accessed as REISERFS_SB(s)->s_rs - * the version in RAM is part of a larger structure containing fields never written to disk. + * Structure of super block on disk, a version of which in RAM is often + * accessed as REISERFS_SB(s)->s_rs. The version in RAM is part of a larger + * structure containing fields never written to disk. */ -#define UNSET_HASH 0 // read_super will guess about, what hash names - // in directories were sorted with +#define UNSET_HASH 0 /* Detect hash on disk */ #define TEA_HASH 1 #define YURA_HASH 2 #define R5_HASH 3 #define DEFAULT_HASH R5_HASH struct journal_params { - __le32 jp_journal_1st_block; /* where does journal start from on its - * device */ - __le32 jp_journal_dev; /* journal device st_rdev */ - __le32 jp_journal_size; /* size of the journal */ - __le32 jp_journal_trans_max; /* max number of blocks in a transaction. */ - __le32 jp_journal_magic; /* random value made on fs creation (this - * was sb_journal_block_count) */ - __le32 jp_journal_max_batch; /* max number of blocks to batch into a - * trans */ - __le32 jp_journal_max_commit_age; /* in seconds, how old can an async - * commit be */ - __le32 jp_journal_max_trans_age; /* in seconds, how old can a transaction - * be */ + /* where does journal start from on its * device */ + __le32 jp_journal_1st_block; + + /* journal device st_rdev */ + __le32 jp_journal_dev; + + /* size of the journal */ + __le32 jp_journal_size; + + /* max number of blocks in a transaction. */ + __le32 jp_journal_trans_max; + + /* + * random value made on fs creation + * (this was sb_journal_block_count) + */ + __le32 jp_journal_magic; + + /* max number of blocks to batch into a trans */ + __le32 jp_journal_max_batch; + + /* in seconds, how old can an async commit be */ + __le32 jp_journal_max_commit_age; + + /* in seconds, how old can a transaction be */ + __le32 jp_journal_max_trans_age; }; /* this is the super from 3.5.X, where X >= 10 */ @@ -816,26 +971,48 @@ struct reiserfs_super_block_v1 { __le32 s_root_block; /* root block number */ struct journal_params s_journal; __le16 s_blocksize; /* block size */ - __le16 s_oid_maxsize; /* max size of object id array, see - * get_objectid() commentary */ + + /* max size of object id array, see get_objectid() commentary */ + __le16 s_oid_maxsize; __le16 s_oid_cursize; /* current size of object id array */ - __le16 s_umount_state; /* this is set to 1 when filesystem was - * umounted, to 2 - when not */ - char s_magic[10]; /* reiserfs magic string indicates that - * file system is reiserfs: - * "ReIsErFs" or "ReIsEr2Fs" or "ReIsEr3Fs" */ - __le16 s_fs_state; /* it is set to used by fsck to mark which - * phase of rebuilding is done */ - __le32 s_hash_function_code; /* indicate, what hash function is being use - * to sort names in a directory*/ + + /* this is set to 1 when filesystem was umounted, to 2 - when not */ + __le16 s_umount_state; + + /* + * reiserfs magic string indicates that file system is reiserfs: + * "ReIsErFs" or "ReIsEr2Fs" or "ReIsEr3Fs" + */ + char s_magic[10]; + + /* + * it is set to used by fsck to mark which + * phase of rebuilding is done + */ + __le16 s_fs_state; + /* + * indicate, what hash function is being use + * to sort names in a directory + */ + __le32 s_hash_function_code; __le16 s_tree_height; /* height of disk tree */ - __le16 s_bmap_nr; /* amount of bitmap blocks needed to address - * each block of file system */ - __le16 s_version; /* this field is only reliable on filesystem - * with non-standard journal */ - __le16 s_reserved_for_journal; /* size in blocks of journal area on main - * device, we need to keep after - * making fs with non-standard journal */ + + /* + * amount of bitmap blocks needed to address + * each block of file system + */ + __le16 s_bmap_nr; + + /* + * this field is only reliable on filesystem with non-standard journal + */ + __le16 s_version; + + /* + * size in blocks of journal area on main device, we need to + * keep after making fs with non-standard journal + */ + __le16 s_reserved_for_journal; } __attribute__ ((__packed__)); #define SB_SIZE_V1 (sizeof(struct reiserfs_super_block_v1)) @@ -844,17 +1021,21 @@ struct reiserfs_super_block_v1 { struct reiserfs_super_block { struct reiserfs_super_block_v1 s_v1; __le32 s_inode_generation; - __le32 s_flags; /* Right now used only by inode-attributes, if enabled */ + + /* Right now used only by inode-attributes, if enabled */ + __le32 s_flags; + unsigned char s_uuid[16]; /* filesystem unique identifier */ unsigned char s_label[16]; /* filesystem volume label */ __le16 s_mnt_count; /* Count of mounts since last fsck */ __le16 s_max_mnt_count; /* Maximum mounts before check */ __le32 s_lastcheck; /* Timestamp of last fsck */ __le32 s_check_interval; /* Interval between checks */ - char s_unused[76]; /* zero filled by mkreiserfs and - * reiserfs_convert_objectid_map_v1() - * so any additions must be updated - * there as well. */ + + /* + * zero filled by mkreiserfs and reiserfs_convert_objectid_map_v1() + * so any additions must be updated there as well. */ + char s_unused[76]; } __attribute__ ((__packed__)); #define SB_SIZE (sizeof(struct reiserfs_super_block)) @@ -862,7 +1043,7 @@ struct reiserfs_super_block { #define REISERFS_VERSION_1 0 #define REISERFS_VERSION_2 2 -// on-disk super block fields converted to cpu form +/* on-disk super block fields converted to cpu form */ #define SB_DISK_SUPER_BLOCK(s) (REISERFS_SB(s)->s_rs) #define SB_V1_DISK_SUPER_BLOCK(s) (&(SB_DISK_SUPER_BLOCK(s)->s_v1)) #define SB_BLOCKSIZE(s) \ @@ -917,11 +1098,13 @@ int is_reiserfs_3_5(struct reiserfs_super_block *rs); int is_reiserfs_3_6(struct reiserfs_super_block *rs); int is_reiserfs_jr(struct reiserfs_super_block *rs); -/* ReiserFS leaves the first 64k unused, so that partition labels have - enough space. If someone wants to write a fancy bootloader that - needs more than 64k, let us know, and this will be increased in size. - This number must be larger than than the largest block size on any - platform, or code will break. -Hans */ +/* + * ReiserFS leaves the first 64k unused, so that partition labels have + * enough space. If someone wants to write a fancy bootloader that + * needs more than 64k, let us know, and this will be increased in size. + * This number must be larger than than the largest block size on any + * platform, or code will break. -Hans + */ #define REISERFS_DISK_OFFSET_IN_BYTES (64 * 1024) #define REISERFS_FIRST_BLOCK unused_define #define REISERFS_JOURNAL_OFFSET_IN_BYTES REISERFS_DISK_OFFSET_IN_BYTES @@ -946,8 +1129,7 @@ struct unfm_nodeinfo { unsigned short unfm_freespace; }; -/* there are two formats of keys: 3.5 and 3.6 - */ +/* there are two formats of keys: 3.5 and 3.6 */ #define KEY_FORMAT_3_5 0 #define KEY_FORMAT_3_6 1 @@ -965,8 +1147,10 @@ static inline struct reiserfs_sb_info *REISERFS_SB(const struct super_block *sb) return sb->s_fs_info; } -/* Don't trust REISERFS_SB(sb)->s_bmap_nr, it's a u16 - * which overflows on large file systems. */ +/* + * Don't trust REISERFS_SB(sb)->s_bmap_nr, it's a u16 + * which overflows on large file systems. + */ static inline __u32 reiserfs_bmap_count(struct super_block *sb) { return (SB_BLOCK_COUNT(sb) - 1) / (sb->s_blocksize * 8) + 1; @@ -977,8 +1161,10 @@ static inline int bmap_would_wrap(unsigned bmap_nr) return bmap_nr > ((1LL << 16) - 1); } -/** this says about version of key of all items (but stat data) the - object consists of */ +/* + * this says about version of key of all items (but stat data) the + * object consists of + */ #define get_inode_item_key_version( inode ) \ ((REISERFS_I(inode)->i_flags & i_item_key_version_mask) ? KEY_FORMAT_3_6 : KEY_FORMAT_3_5) @@ -997,16 +1183,18 @@ static inline int bmap_would_wrap(unsigned bmap_nr) else \ REISERFS_I(inode)->i_flags &= ~i_stat_data_version_mask; }) -/* This is an aggressive tail suppression policy, I am hoping it - improves our benchmarks. The principle behind it is that percentage - space saving is what matters, not absolute space saving. This is - non-intuitive, but it helps to understand it if you consider that the - cost to access 4 blocks is not much more than the cost to access 1 - block, if you have to do a seek and rotate. A tail risks a - non-linear disk access that is significant as a percentage of total - time cost for a 4 block file and saves an amount of space that is - less significant as a percentage of space, or so goes the hypothesis. - -Hans */ +/* + * This is an aggressive tail suppression policy, I am hoping it + * improves our benchmarks. The principle behind it is that percentage + * space saving is what matters, not absolute space saving. This is + * non-intuitive, but it helps to understand it if you consider that the + * cost to access 4 blocks is not much more than the cost to access 1 + * block, if you have to do a seek and rotate. A tail risks a + * non-linear disk access that is significant as a percentage of total + * time cost for a 4 block file and saves an amount of space that is + * less significant as a percentage of space, or so goes the hypothesis. + * -Hans + */ #define STORE_TAIL_IN_UNFM_S1(n_file_size,n_tail_size,n_block_size) \ (\ (!(n_tail_size)) || \ @@ -1020,10 +1208,11 @@ static inline int bmap_would_wrap(unsigned bmap_nr) ( (n_tail_size) >= (MAX_DIRECT_ITEM_LEN(n_block_size) * 3)/4) ) ) \ ) -/* Another strategy for tails, this one means only create a tail if all the - file would fit into one DIRECT item. - Primary intention for this one is to increase performance by decreasing - seeking. +/* + * Another strategy for tails, this one means only create a tail if all the + * file would fit into one DIRECT item. + * Primary intention for this one is to increase performance by decreasing + * seeking. */ #define STORE_TAIL_IN_UNFM_S2(n_file_size,n_tail_size,n_block_size) \ (\ @@ -1037,23 +1226,21 @@ static inline int bmap_would_wrap(unsigned bmap_nr) #define REISERFS_VALID_FS 1 #define REISERFS_ERROR_FS 2 -// -// there are 5 item types currently -// +/* + * there are 5 item types currently + */ #define TYPE_STAT_DATA 0 #define TYPE_INDIRECT 1 #define TYPE_DIRECT 2 #define TYPE_DIRENTRY 3 #define TYPE_MAXTYPE 3 -#define TYPE_ANY 15 // FIXME: comment is required +#define TYPE_ANY 15 /* FIXME: comment is required */ -/***************************************************************************/ -/* KEY & ITEM HEAD */ -/***************************************************************************/ +/*************************************************************************** + * KEY & ITEM HEAD * + ***************************************************************************/ -// -// directories use this key as well as old files -// +/* * directories use this key as well as old files */ struct offset_v1 { __le32 k_offset; __le32 k_uniqueness; @@ -1086,11 +1273,14 @@ static inline void set_offset_v2_k_offset(struct offset_v2 *v2, loff_t offset) v2->v = (v2->v & cpu_to_le64(15ULL << 60)) | cpu_to_le64(offset); } -/* Key of an item determines its location in the S+tree, and - is composed of 4 components */ +/* + * Key of an item determines its location in the S+tree, and + * is composed of 4 components + */ struct reiserfs_key { - __le32 k_dir_id; /* packing locality: by default parent - directory object id */ + /* packing locality: by default parent directory object id */ + __le32 k_dir_id; + __le32 k_objectid; /* object identifier */ union { struct offset_v1 k_offset_v1; @@ -1099,8 +1289,8 @@ struct reiserfs_key { } __attribute__ ((__packed__)); struct in_core_key { - __u32 k_dir_id; /* packing locality: by default parent - directory object id */ + /* packing locality: by default parent directory object id */ + __u32 k_dir_id; __u32 k_objectid; /* object identifier */ __u64 k_offset; __u8 k_type; @@ -1109,14 +1299,16 @@ struct in_core_key { struct cpu_key { struct in_core_key on_disk_key; int version; - int key_length; /* 3 in all cases but direct2indirect and - indirect2direct conversion */ + /* 3 in all cases but direct2indirect and indirect2direct conversion */ + int key_length; }; -/* Our function for comparing keys can compare keys of different - lengths. It takes as a parameter the length of the keys it is to - compare. These defines are used in determining what is to be passed - to it as that parameter. */ +/* + * Our function for comparing keys can compare keys of different + * lengths. It takes as a parameter the length of the keys it is to + * compare. These defines are used in determining what is to be passed + * to it as that parameter. + */ #define REISERFS_FULL_KEY_LEN 4 #define REISERFS_SHORT_KEY_LEN 2 @@ -1145,40 +1337,52 @@ struct cpu_key { #define POSITION_FOUND 1 #define POSITION_NOT_FOUND 0 -// return values for reiserfs_find_entry and search_by_entry_key +/* return values for reiserfs_find_entry and search_by_entry_key */ #define NAME_FOUND 1 #define NAME_NOT_FOUND 0 #define GOTO_PREVIOUS_ITEM 2 #define NAME_FOUND_INVISIBLE 3 -/* Everything in the filesystem is stored as a set of items. The - item head contains the key of the item, its free space (for - indirect items) and specifies the location of the item itself - within the block. */ +/* + * Everything in the filesystem is stored as a set of items. The + * item head contains the key of the item, its free space (for + * indirect items) and specifies the location of the item itself + * within the block. + */ struct item_head { - /* Everything in the tree is found by searching for it based on - * its key.*/ + /* + * Everything in the tree is found by searching for it based on + * its key. + */ struct reiserfs_key ih_key; union { - /* The free space in the last unformatted node of an - indirect item if this is an indirect item. This - equals 0xFFFF iff this is a direct item or stat data - item. Note that the key, not this field, is used to - determine the item type, and thus which field this - union contains. */ + /* + * The free space in the last unformatted node of an + * indirect item if this is an indirect item. This + * equals 0xFFFF iff this is a direct item or stat data + * item. Note that the key, not this field, is used to + * determine the item type, and thus which field this + * union contains. + */ __le16 ih_free_space_reserved; - /* Iff this is a directory item, this field equals the - number of directory entries in the directory item. */ + + /* + * Iff this is a directory item, this field equals the + * number of directory entries in the directory item. + */ __le16 ih_entry_count; } __attribute__ ((__packed__)) u; __le16 ih_item_len; /* total size of the item body */ - __le16 ih_item_location; /* an offset to the item body - * within the block */ - __le16 ih_version; /* 0 for all old items, 2 for new - ones. Highest bit is set by fsck - temporary, cleaned after all - done */ + + /* an offset to the item body within the block */ + __le16 ih_item_location; + + /* + * 0 for all old items, 2 for new ones. Highest bit is set by fsck + * temporary, cleaned after all done + */ + __le16 ih_version; } __attribute__ ((__packed__)); /* size of item header */ #define IH_SIZE (sizeof(struct item_head)) @@ -1200,27 +1404,24 @@ struct item_head { #define get_ih_free_space(ih) (ih_version (ih) == KEY_FORMAT_3_6 ? 0 : ih_free_space (ih)) #define set_ih_free_space(ih,val) put_ih_free_space((ih), ((ih_version(ih) == KEY_FORMAT_3_6) ? 0 : (val))) -/* these operate on indirect items, where you've got an array of ints -** at a possibly unaligned location. These are a noop on ia32 -** -** p is the array of __u32, i is the index into the array, v is the value -** to store there. -*/ +/* + * these operate on indirect items, where you've got an array of ints + * at a possibly unaligned location. These are a noop on ia32 + * + * p is the array of __u32, i is the index into the array, v is the value + * to store there. + */ #define get_block_num(p, i) get_unaligned_le32((p) + (i)) #define put_block_num(p, i, v) put_unaligned_le32((v), (p) + (i)) -// -// in old version uniqueness field shows key type -// +/* * in old version uniqueness field shows key type */ #define V1_SD_UNIQUENESS 0 #define V1_INDIRECT_UNIQUENESS 0xfffffffe #define V1_DIRECT_UNIQUENESS 0xffffffff #define V1_DIRENTRY_UNIQUENESS 500 -#define V1_ANY_UNIQUENESS 555 // FIXME: comment is required +#define V1_ANY_UNIQUENESS 555 /* FIXME: comment is required */ -// -// here are conversion routines -// +/* here are conversion routines */ static inline int uniqueness2type(__u32 uniqueness) CONSTF; static inline int uniqueness2type(__u32 uniqueness) { @@ -1257,11 +1458,11 @@ static inline __u32 type2uniqueness(int type) } } -// -// key is pointer to on disk key which is stored in le, result is cpu, -// there is no way to get version of object from key, so, provide -// version to these defines -// +/* + * key is pointer to on disk key which is stored in le, result is cpu, + * there is no way to get version of object from key, so, provide + * version to these defines + */ static inline loff_t le_key_k_offset(int version, const struct reiserfs_key *key) { @@ -1350,9 +1551,7 @@ static inline int is_statdata_le_key(int version, struct reiserfs_key *key) return le_key_k_type(version, key) == TYPE_STAT_DATA; } -// -// item header has version. -// +/* item header has version. */ static inline int is_direntry_le_ih(struct item_head *ih) { return is_direntry_le_key(ih_version(ih), &ih->ih_key); @@ -1373,9 +1572,7 @@ static inline int is_statdata_le_ih(struct item_head *ih) return is_statdata_le_key(ih_version(ih), &ih->ih_key); } -// -// key is pointer to cpu key, result is cpu -// +/* key is pointer to cpu key, result is cpu */ static inline loff_t cpu_key_k_offset(const struct cpu_key *key) { return key->on_disk_key.k_offset; @@ -1426,7 +1623,7 @@ static inline void cpu_key_k_offset_dec(struct cpu_key *key) extern struct reiserfs_key root_key; -/* +/* * Picture represents a leaf of the S+tree * ______________________________________________________ * | | Array of | | | @@ -1435,15 +1632,19 @@ extern struct reiserfs_key root_key; * |______|_______________|___________________|___________| */ -/* Header of a disk block. More precisely, header of a formatted leaf - or internal node, and not the header of an unformatted node. */ +/* + * Header of a disk block. More precisely, header of a formatted leaf + * or internal node, and not the header of an unformatted node. + */ struct block_head { __le16 blk_level; /* Level of a block in the tree. */ __le16 blk_nr_item; /* Number of keys/items in a block. */ __le16 blk_free_space; /* Block free space in bytes. */ __le16 blk_reserved; /* dump this in v4/planA */ - struct reiserfs_key blk_right_delim_key; /* kept only for compatibility */ + + /* kept only for compatibility */ + struct reiserfs_key blk_right_delim_key; }; #define BLKH_SIZE (sizeof(struct block_head)) @@ -1458,18 +1659,20 @@ struct block_head { #define blkh_right_delim_key(p_blkh) ((p_blkh)->blk_right_delim_key) #define set_blkh_right_delim_key(p_blkh,val) ((p_blkh)->blk_right_delim_key = val) +/* values for blk_level field of the struct block_head */ + /* - * values for blk_level field of the struct block_head + * When node gets removed from the tree its blk_level is set to FREE_LEVEL. + * It is then used to see whether the node is still in the tree */ - -#define FREE_LEVEL 0 /* when node gets removed from the tree its - blk_level is set to FREE_LEVEL. It is then - used to see whether the node is still in the - tree */ +#define FREE_LEVEL 0 #define DISK_LEAF_NODE_LEVEL 1 /* Leaf node level. */ -/* Given the buffer head of a formatted node, resolve to the block head of that node. */ +/* + * Given the buffer head of a formatted node, resolve to the + * block head of that node. + */ #define B_BLK_HEAD(bh) ((struct block_head *)((bh)->b_data)) /* Number of items that are in buffer. */ #define B_NR_ITEMS(bh) (blkh_nr_item(B_BLK_HEAD(bh))) @@ -1490,14 +1693,14 @@ struct block_head { #define B_IS_KEYS_LEVEL(bh) (B_LEVEL(bh) > DISK_LEAF_NODE_LEVEL \ && B_LEVEL(bh) <= MAX_HEIGHT) -/***************************************************************************/ -/* STAT DATA */ -/***************************************************************************/ +/*************************************************************************** + * STAT DATA * + ***************************************************************************/ -// -// old stat data is 32 bytes long. We are going to distinguish new one by -// different size -// +/* + * old stat data is 32 bytes long. We are going to distinguish new one by + * different size +*/ struct stat_data_v1 { __le16 sd_mode; /* file type, permissions */ __le16 sd_nlink; /* number of hard links */ @@ -1506,20 +1709,25 @@ struct stat_data_v1 { __le32 sd_size; /* file size */ __le32 sd_atime; /* time of last access */ __le32 sd_mtime; /* time file was last modified */ - __le32 sd_ctime; /* time inode (stat data) was last changed (except changes to sd_atime and sd_mtime) */ + + /* + * time inode (stat data) was last changed + * (except changes to sd_atime and sd_mtime) + */ + __le32 sd_ctime; union { __le32 sd_rdev; __le32 sd_blocks; /* number of blocks file uses */ } __attribute__ ((__packed__)) u; - __le32 sd_first_direct_byte; /* first byte of file which is stored - in a direct item: except that if it - equals 1 it is a symlink and if it - equals ~(__u32)0 there is no - direct item. The existence of this - field really grates on me. Let's - replace it with a macro based on - sd_size and our tail suppression - policy. Someday. -Hans */ + + /* + * first byte of file which is stored in a direct item: except that if + * it equals 1 it is a symlink and if it equals ~(__u32)0 there is no + * direct item. The existence of this field really grates on me. + * Let's replace it with a macro based on sd_size and our tail + * suppression policy. Someday. -Hans + */ + __le32 sd_first_direct_byte; } __attribute__ ((__packed__)); #define SD_V1_SIZE (sizeof(struct stat_data_v1)) @@ -1551,8 +1759,10 @@ struct stat_data_v1 { /* inode flags stored in sd_attrs (nee sd_reserved) */ -/* we want common flags to have the same values as in ext2, - so chattr(1) will work without problems */ +/* + * we want common flags to have the same values as in ext2, + * so chattr(1) will work without problems + */ #define REISERFS_IMMUTABLE_FL FS_IMMUTABLE_FL #define REISERFS_APPEND_FL FS_APPEND_FL #define REISERFS_SYNC_FL FS_SYNC_FL @@ -1572,8 +1782,10 @@ struct stat_data_v1 { REISERFS_COMPR_FL | \ REISERFS_NOTAIL_FL ) -/* Stat Data on disk (reiserfs version of UFS disk inode minus the - address blocks) */ +/* + * Stat Data on disk (reiserfs version of UFS disk inode minus the + * address blocks) + */ struct stat_data { __le16 sd_mode; /* file type, permissions */ __le16 sd_attrs; /* persistent inode flags */ @@ -1583,25 +1795,20 @@ struct stat_data { __le32 sd_gid; /* group */ __le32 sd_atime; /* time of last access */ __le32 sd_mtime; /* time file was last modified */ - __le32 sd_ctime; /* time inode (stat data) was last changed (except changes to sd_atime and sd_mtime) */ + + /* + * time inode (stat data) was last changed + * (except changes to sd_atime and sd_mtime) + */ + __le32 sd_ctime; __le32 sd_blocks; union { __le32 sd_rdev; __le32 sd_generation; - //__le32 sd_first_direct_byte; - /* first byte of file which is stored in a - direct item: except that if it equals 1 - it is a symlink and if it equals - ~(__u32)0 there is no direct item. The - existence of this field really grates - on me. Let's replace it with a macro - based on sd_size and our tail - suppression policy? */ } __attribute__ ((__packed__)) u; } __attribute__ ((__packed__)); -// -// this is 44 bytes long -// + +/* this is 44 bytes long */ #define SD_SIZE (sizeof(struct stat_data)) #define SD_V2_SIZE SD_SIZE #define stat_data_v2(ih) (ih_version (ih) == KEY_FORMAT_3_6) @@ -1632,48 +1839,61 @@ struct stat_data { #define sd_v2_attrs(sdp) (le16_to_cpu((sdp)->sd_attrs)) #define set_sd_v2_attrs(sdp,v) ((sdp)->sd_attrs = cpu_to_le16(v)) -/***************************************************************************/ -/* DIRECTORY STRUCTURE */ -/***************************************************************************/ -/* - Picture represents the structure of directory items - ________________________________________________ - | Array of | | | | | | - | directory |N-1| N-2 | .... | 1st |0th| - | entry headers | | | | | | - |_______________|___|_____|________|_______|___| - <---- directory entries ------> - - First directory item has k_offset component 1. We store "." and ".." - in one item, always, we never split "." and ".." into differing - items. This makes, among other things, the code for removing - directories simpler. */ +/*************************************************************************** + * DIRECTORY STRUCTURE * + ***************************************************************************/ +/* + * Picture represents the structure of directory items + * ________________________________________________ + * | Array of | | | | | | + * | directory |N-1| N-2 | .... | 1st |0th| + * | entry headers | | | | | | + * |_______________|___|_____|________|_______|___| + * <---- directory entries ------> + * + * First directory item has k_offset component 1. We store "." and ".." + * in one item, always, we never split "." and ".." into differing + * items. This makes, among other things, the code for removing + * directories simpler. + */ #define SD_OFFSET 0 #define SD_UNIQUENESS 0 #define DOT_OFFSET 1 #define DOT_DOT_OFFSET 2 #define DIRENTRY_UNIQUENESS 500 -/* */ #define FIRST_ITEM_OFFSET 1 /* - Q: How to get key of object pointed to by entry from entry? - - A: Each directory entry has its header. This header has deh_dir_id and deh_objectid fields, those are key - of object, entry points to */ + * Q: How to get key of object pointed to by entry from entry? + * + * A: Each directory entry has its header. This header has deh_dir_id + * and deh_objectid fields, those are key of object, entry points to + */ -/* NOT IMPLEMENTED: - Directory will someday contain stat data of object */ +/* + * NOT IMPLEMENTED: + * Directory will someday contain stat data of object + */ struct reiserfs_de_head { __le32 deh_offset; /* third component of the directory entry key */ - __le32 deh_dir_id; /* objectid of the parent directory of the object, that is referenced - by directory entry */ - __le32 deh_objectid; /* objectid of the object, that is referenced by directory entry */ + + /* + * objectid of the parent directory of the object, that is referenced + * by directory entry + */ + __le32 deh_dir_id; + + /* objectid of the object, that is referenced by directory entry */ + __le32 deh_objectid; __le16 deh_location; /* offset of name in the whole item */ - __le16 deh_state; /* whether 1) entry contains stat data (for future), and 2) whether - entry is hidden (unlinked) */ + + /* + * whether 1) entry contains stat data (for future), and + * 2) whether entry is hidden (unlinked) + */ + __le16 deh_state; } __attribute__ ((__packed__)); #define DEH_SIZE sizeof(struct reiserfs_de_head) #define deh_offset(p_deh) (le32_to_cpu((p_deh)->deh_offset)) @@ -1703,9 +1923,11 @@ struct reiserfs_de_head { # define ADDR_UNALIGNED_BITS (3) #endif -/* These are only used to manipulate deh_state. +/* + * These are only used to manipulate deh_state. * Because of this, we'll use the ext2_ bit routines, - * since they are little endian */ + * since they are little endian + */ #ifdef ADDR_UNALIGNED_BITS # define aligned_address(addr) ((void *)((long)(addr) & ~((1UL << ADDR_UNALIGNED_BITS) - 1))) @@ -1740,13 +1962,16 @@ extern void make_empty_dir_item_v1(char *body, __le32 dirid, __le32 objid, extern void make_empty_dir_item(char *body, __le32 dirid, __le32 objid, __le32 par_dirid, __le32 par_objid); -// two entries per block (at least) +/* two entries per block (at least) */ #define REISERFS_MAX_NAME(block_size) 255 -/* this structure is used for operations on directory entries. It is - not a disk structure. */ -/* When reiserfs_find_entry or search_by_entry_key find directory - entry, they return filled reiserfs_dir_entry structure */ +/* + * this structure is used for operations on directory entries. It is + * not a disk structure. + * + * When reiserfs_find_entry or search_by_entry_key find directory + * entry, they return filled reiserfs_dir_entry structure + */ struct reiserfs_dir_entry { struct buffer_head *de_bh; int de_item_num; @@ -1764,7 +1989,10 @@ struct reiserfs_dir_entry { struct cpu_key de_entry_key; }; -/* these defines are useful when a particular member of a reiserfs_dir_entry is needed */ +/* + * these defines are useful when a particular member of + * a reiserfs_dir_entry is needed + */ /* pointer to file name, stored in entry */ #define B_I_DEH_ENTRY_FILE_NAME(bh, ih, deh) \ @@ -1791,11 +2019,13 @@ struct reiserfs_dir_entry { * |______|_______________|___________________|___________| */ -/***************************************************************************/ -/* DISK CHILD */ -/***************************************************************************/ -/* Disk child pointer: The pointer from an internal node of the tree - to a node that is on disk. */ +/*************************************************************************** + * DISK CHILD * + ***************************************************************************/ +/* + * Disk child pointer: + * The pointer from an internal node of the tree to a node that is on disk. + */ struct disk_child { __le32 dc_block_number; /* Disk child's block number. */ __le16 dc_size; /* Disk child's used space. */ @@ -1828,47 +2058,66 @@ struct disk_child { #define MAX_NR_KEY(bh) ( (MAX_CHILD_SIZE(bh)-DC_SIZE)/(KEY_SIZE+DC_SIZE) ) #define MIN_NR_KEY(bh) (MAX_NR_KEY(bh)/2) -/***************************************************************************/ -/* PATH STRUCTURES AND DEFINES */ -/***************************************************************************/ +/*************************************************************************** + * PATH STRUCTURES AND DEFINES * + ***************************************************************************/ -/* Search_by_key fills up the path from the root to the leaf as it descends the tree looking for the - key. It uses reiserfs_bread to try to find buffers in the cache given their block number. If it - does not find them in the cache it reads them from disk. For each node search_by_key finds using - reiserfs_bread it then uses bin_search to look through that node. bin_search will find the - position of the block_number of the next node if it is looking through an internal node. If it - is looking through a leaf node bin_search will find the position of the item which has key either - equal to given key, or which is the maximal key less than the given key. */ +/* + * search_by_key fills up the path from the root to the leaf as it descends + * the tree looking for the key. It uses reiserfs_bread to try to find + * buffers in the cache given their block number. If it does not find + * them in the cache it reads them from disk. For each node search_by_key + * finds using reiserfs_bread it then uses bin_search to look through that + * node. bin_search will find the position of the block_number of the next + * node if it is looking through an internal node. If it is looking through + * a leaf node bin_search will find the position of the item which has key + * either equal to given key, or which is the maximal key less than the + * given key. + */ struct path_element { - struct buffer_head *pe_buffer; /* Pointer to the buffer at the path in the tree. */ - int pe_position; /* Position in the tree node which is placed in the */ - /* buffer above. */ + /* Pointer to the buffer at the path in the tree. */ + struct buffer_head *pe_buffer; + /* Position in the tree node which is placed in the buffer above. */ + int pe_position; }; -#define MAX_HEIGHT 5 /* maximal height of a tree. don't change this without changing JOURNAL_PER_BALANCE_CNT */ -#define EXTENDED_MAX_HEIGHT 7 /* Must be equals MAX_HEIGHT + FIRST_PATH_ELEMENT_OFFSET */ -#define FIRST_PATH_ELEMENT_OFFSET 2 /* Must be equal to at least 2. */ - -#define ILLEGAL_PATH_ELEMENT_OFFSET 1 /* Must be equal to FIRST_PATH_ELEMENT_OFFSET - 1 */ -#define MAX_FEB_SIZE 6 /* this MUST be MAX_HEIGHT + 1. See about FEB below */ - -/* We need to keep track of who the ancestors of nodes are. When we - perform a search we record which nodes were visited while - descending the tree looking for the node we searched for. This list - of nodes is called the path. This information is used while - performing balancing. Note that this path information may become - invalid, and this means we must check it when using it to see if it - is still valid. You'll need to read search_by_key and the comments - in it, especially about decrement_counters_in_path(), to understand - this structure. - -Paths make the code so much harder to work with and debug.... An -enormous number of bugs are due to them, and trying to write or modify -code that uses them just makes my head hurt. They are based on an -excessive effort to avoid disturbing the precious VFS code.:-( The -gods only know how we are going to SMP the code that uses them. -znodes are the way! */ +/* + * maximal height of a tree. don't change this without + * changing JOURNAL_PER_BALANCE_CNT + */ +#define MAX_HEIGHT 5 + +/* Must be equals MAX_HEIGHT + FIRST_PATH_ELEMENT_OFFSET */ +#define EXTENDED_MAX_HEIGHT 7 + +/* Must be equal to at least 2. */ +#define FIRST_PATH_ELEMENT_OFFSET 2 + +/* Must be equal to FIRST_PATH_ELEMENT_OFFSET - 1 */ +#define ILLEGAL_PATH_ELEMENT_OFFSET 1 + +/* this MUST be MAX_HEIGHT + 1. See about FEB below */ +#define MAX_FEB_SIZE 6 + +/* + * We need to keep track of who the ancestors of nodes are. When we + * perform a search we record which nodes were visited while + * descending the tree looking for the node we searched for. This list + * of nodes is called the path. This information is used while + * performing balancing. Note that this path information may become + * invalid, and this means we must check it when using it to see if it + * is still valid. You'll need to read search_by_key and the comments + * in it, especially about decrement_counters_in_path(), to understand + * this structure. + * + * Paths make the code so much harder to work with and debug.... An + * enormous number of bugs are due to them, and trying to write or modify + * code that uses them just makes my head hurt. They are based on an + * excessive effort to avoid disturbing the precious VFS code.:-( The + * gods only know how we are going to SMP the code that uses them. + * znodes are the way! + */ #define PATH_READA 0x1 /* do read ahead */ #define PATH_READA_BACK 0x2 /* read backwards */ @@ -1876,7 +2125,8 @@ znodes are the way! */ struct treepath { int path_length; /* Length of the array above. */ int reada; - struct path_element path_elements[EXTENDED_MAX_HEIGHT]; /* Array of the path elements. */ + /* Array of the path elements. */ + struct path_element path_elements[EXTENDED_MAX_HEIGHT]; int pos_in_item; }; @@ -1895,20 +2145,31 @@ struct treepath var = {.path_length = ILLEGAL_PATH_ELEMENT_OFFSET, .reada = 0,} #define PATH_OFFSET_POSITION(path, n_offset) (PATH_OFFSET_PELEMENT(path, n_offset)->pe_position) #define PATH_PLAST_BUFFER(path) (PATH_OFFSET_PBUFFER((path), (path)->path_length)) - /* you know, to the person who didn't - write this the macro name does not - at first suggest what it does. - Maybe POSITION_FROM_PATH_END? Or - maybe we should just focus on - dumping paths... -Hans */ + +/* + * you know, to the person who didn't write this the macro name does not + * at first suggest what it does. Maybe POSITION_FROM_PATH_END? Or + * maybe we should just focus on dumping paths... -Hans + */ #define PATH_LAST_POSITION(path) (PATH_OFFSET_POSITION((path), (path)->path_length)) -/* in do_balance leaf has h == 0 in contrast with path structure, - where root has level == 0. That is why we need these defines */ -#define PATH_H_PBUFFER(path, h) PATH_OFFSET_PBUFFER (path, path->path_length - (h)) /* tb->S[h] */ -#define PATH_H_PPARENT(path, h) PATH_H_PBUFFER (path, (h) + 1) /* tb->F[h] or tb->S[0]->b_parent */ -#define PATH_H_POSITION(path, h) PATH_OFFSET_POSITION (path, path->path_length - (h)) -#define PATH_H_B_ITEM_ORDER(path, h) PATH_H_POSITION(path, h + 1) /* tb->S[h]->b_item_order */ +/* + * in do_balance leaf has h == 0 in contrast with path structure, + * where root has level == 0. That is why we need these defines + */ + +/* tb->S[h] */ +#define PATH_H_PBUFFER(path, h) \ + PATH_OFFSET_PBUFFER(path, path->path_length - (h)) + +/* tb->F[h] or tb->S[0]->b_parent */ +#define PATH_H_PPARENT(path, h) PATH_H_PBUFFER(path, (h) + 1) + +#define PATH_H_POSITION(path, h) \ + PATH_OFFSET_POSITION(path, path->path_length - (h)) + +/* tb->S[h]->b_item_order */ +#define PATH_H_B_ITEM_ORDER(path, h) PATH_H_POSITION(path, h + 1) #define PATH_H_PATH_OFFSET(path, n_h) ((path)->path_length - (n_h)) @@ -1973,16 +2234,14 @@ static inline void *tp_item_body(const struct treepath *path) /* get item body */ #define B_I_DEH(bh, ih) ((struct reiserfs_de_head *)(ih_item_body(bh, ih))) -/* length of the directory entry in directory item. This define - calculates length of i-th directory entry using directory entry - locations from dir entry head. When it calculates length of 0-th - directory entry, it uses length of whole item in place of entry - location of the non-existent following entry in the calculation. - See picture above.*/ /* -#define I_DEH_N_ENTRY_LENGTH(ih,deh,i) \ -((i) ? (deh_location((deh)-1) - deh_location((deh))) : (ih_item_len((ih)) - deh_location((deh)))) -*/ + * length of the directory entry in directory item. This define + * calculates length of i-th directory entry using directory entry + * locations from dir entry head. When it calculates length of 0-th + * directory entry, it uses length of whole item in place of entry + * location of the non-existent following entry in the calculation. + * See picture above. + */ static inline int entry_length(const struct buffer_head *bh, const struct item_head *ih, int pos_in_item) { @@ -1995,15 +2254,15 @@ static inline int entry_length(const struct buffer_head *bh, return ih_item_len(ih) - deh_location(deh); } -/***************************************************************************/ -/* MISC */ -/***************************************************************************/ +/*************************************************************************** + * MISC * + ***************************************************************************/ /* Size of pointer to the unformatted node. */ #define UNFM_P_SIZE (sizeof(unp_t)) #define UNFM_P_SHIFT 2 -// in in-core inode key is stored on le form +/* in in-core inode key is stored on le form */ #define INODE_PKEY(inode) ((struct reiserfs_key *)(REISERFS_I(inode)->i_key)) #define MAX_UL_INT 0xffffffff @@ -2019,7 +2278,6 @@ static inline loff_t max_reiserfs_offset(struct inode *inode) return (loff_t) ((~(__u64) 0) >> 4); } -/*#define MAX_KEY_UNIQUENESS MAX_UL_INT*/ #define MAX_KEY_OBJECTID MAX_UL_INT #define MAX_B_NUM MAX_UL_INT @@ -2028,9 +2286,12 @@ static inline loff_t max_reiserfs_offset(struct inode *inode) /* the purpose is to detect overflow of an unsigned short */ #define REISERFS_LINK_MAX (MAX_US_INT - 1000) -/* The following defines are used in reiserfs_insert_item and reiserfs_append_item */ -#define REISERFS_KERNEL_MEM 0 /* reiserfs kernel memory mode */ -#define REISERFS_USER_MEM 1 /* reiserfs user memory mode */ +/* + * The following defines are used in reiserfs_insert_item + * and reiserfs_append_item + */ +#define REISERFS_KERNEL_MEM 0 /* kernel memory mode */ +#define REISERFS_USER_MEM 1 /* user memory mode */ #define fs_generation(s) (REISERFS_SB(s)->s_generation_counter) #define get_generation(s) atomic_read (&fs_generation(s)) @@ -2042,46 +2303,65 @@ static inline loff_t max_reiserfs_offset(struct inode *inode) __fs_changed(gen, s); \ }) -/***************************************************************************/ -/* FIXATE NODES */ -/***************************************************************************/ +/*************************************************************************** + * FIXATE NODES * + ***************************************************************************/ #define VI_TYPE_LEFT_MERGEABLE 1 #define VI_TYPE_RIGHT_MERGEABLE 2 -/* To make any changes in the tree we always first find node, that - contains item to be changed/deleted or place to insert a new - item. We call this node S. To do balancing we need to decide what - we will shift to left/right neighbor, or to a new node, where new - item will be etc. To make this analysis simpler we build virtual - node. Virtual node is an array of items, that will replace items of - node S. (For instance if we are going to delete an item, virtual - node does not contain it). Virtual node keeps information about - item sizes and types, mergeability of first and last items, sizes - of all entries in directory item. We use this array of items when - calculating what we can shift to neighbors and how many nodes we - have to have if we do not any shiftings, if we shift to left/right - neighbor or to both. */ +/* + * To make any changes in the tree we always first find node, that + * contains item to be changed/deleted or place to insert a new + * item. We call this node S. To do balancing we need to decide what + * we will shift to left/right neighbor, or to a new node, where new + * item will be etc. To make this analysis simpler we build virtual + * node. Virtual node is an array of items, that will replace items of + * node S. (For instance if we are going to delete an item, virtual + * node does not contain it). Virtual node keeps information about + * item sizes and types, mergeability of first and last items, sizes + * of all entries in directory item. We use this array of items when + * calculating what we can shift to neighbors and how many nodes we + * have to have if we do not any shiftings, if we shift to left/right + * neighbor or to both. + */ struct virtual_item { - int vi_index; // index in the array of item operations - unsigned short vi_type; // left/right mergeability - unsigned short vi_item_len; /* length of item that it will have after balancing */ + int vi_index; /* index in the array of item operations */ + unsigned short vi_type; /* left/right mergeability */ + + /* length of item that it will have after balancing */ + unsigned short vi_item_len; + struct item_head *vi_ih; - const char *vi_item; // body of item (old or new) - const void *vi_new_data; // 0 always but paste mode - void *vi_uarea; // item specific area + const char *vi_item; /* body of item (old or new) */ + const void *vi_new_data; /* 0 always but paste mode */ + void *vi_uarea; /* item specific area */ }; struct virtual_node { - char *vn_free_ptr; /* this is a pointer to the free space in the buffer */ + /* this is a pointer to the free space in the buffer */ + char *vn_free_ptr; + unsigned short vn_nr_item; /* number of items in virtual node */ - short vn_size; /* size of node , that node would have if it has unlimited size and no balancing is performed */ - short vn_mode; /* mode of balancing (paste, insert, delete, cut) */ + + /* + * size of node , that node would have if it has + * unlimited size and no balancing is performed + */ + short vn_size; + + /* mode of balancing (paste, insert, delete, cut) */ + short vn_mode; + short vn_affected_item_num; short vn_pos_in_item; - struct item_head *vn_ins_ih; /* item header of inserted item, 0 for other modes */ + + /* item header of inserted item, 0 for other modes */ + struct item_head *vn_ins_ih; const void *vn_data; - struct virtual_item *vn_vi; /* array of items (including a new one, excluding item to be deleted) */ + + /* array of items (including a new one, excluding item to be deleted) */ + struct virtual_item *vn_vi; }; /* used by directory items when creating virtual nodes */ @@ -2091,22 +2371,25 @@ struct direntry_uarea { __u16 entry_sizes[1]; } __attribute__ ((__packed__)); -/***************************************************************************/ -/* TREE BALANCE */ -/***************************************************************************/ +/*************************************************************************** + * TREE BALANCE * + ***************************************************************************/ -/* This temporary structure is used in tree balance algorithms, and - constructed as we go to the extent that its various parts are - needed. It contains arrays of nodes that can potentially be - involved in the balancing of node S, and parameters that define how - each of the nodes must be balanced. Note that in these algorithms - for balancing the worst case is to need to balance the current node - S and the left and right neighbors and all of their parents plus - create a new node. We implement S1 balancing for the leaf nodes - and S0 balancing for the internal nodes (S1 and S0 are defined in - our papers.)*/ +/* + * This temporary structure is used in tree balance algorithms, and + * constructed as we go to the extent that its various parts are + * needed. It contains arrays of nodes that can potentially be + * involved in the balancing of node S, and parameters that define how + * each of the nodes must be balanced. Note that in these algorithms + * for balancing the worst case is to need to balance the current node + * S and the left and right neighbors and all of their parents plus + * create a new node. We implement S1 balancing for the leaf nodes + * and S0 balancing for the internal nodes (S1 and S0 are defined in + * our papers.) + */ -#define MAX_FREE_BLOCK 7 /* size of the array of buffers to free at end of do_balance */ +/* size of the array of buffers to free at end of do_balance */ +#define MAX_FREE_BLOCK 7 /* maximum number of FEB blocknrs on a single level */ #define MAX_AMOUNT_NEEDED 2 @@ -2118,64 +2401,132 @@ struct tree_balance { struct super_block *tb_sb; struct reiserfs_transaction_handle *transaction_handle; struct treepath *tb_path; - struct buffer_head *L[MAX_HEIGHT]; /* array of left neighbors of nodes in the path */ - struct buffer_head *R[MAX_HEIGHT]; /* array of right neighbors of nodes in the path */ - struct buffer_head *FL[MAX_HEIGHT]; /* array of fathers of the left neighbors */ - struct buffer_head *FR[MAX_HEIGHT]; /* array of fathers of the right neighbors */ - struct buffer_head *CFL[MAX_HEIGHT]; /* array of common parents of center node and its left neighbor */ - struct buffer_head *CFR[MAX_HEIGHT]; /* array of common parents of center node and its right neighbor */ - - struct buffer_head *FEB[MAX_FEB_SIZE]; /* array of empty buffers. Number of buffers in array equals - cur_blknum. */ + + /* array of left neighbors of nodes in the path */ + struct buffer_head *L[MAX_HEIGHT]; + + /* array of right neighbors of nodes in the path */ + struct buffer_head *R[MAX_HEIGHT]; + + /* array of fathers of the left neighbors */ + struct buffer_head *FL[MAX_HEIGHT]; + + /* array of fathers of the right neighbors */ + struct buffer_head *FR[MAX_HEIGHT]; + /* array of common parents of center node and its left neighbor */ + struct buffer_head *CFL[MAX_HEIGHT]; + + /* array of common parents of center node and its right neighbor */ + struct buffer_head *CFR[MAX_HEIGHT]; + + /* + * array of empty buffers. Number of buffers in array equals + * cur_blknum. + */ + struct buffer_head *FEB[MAX_FEB_SIZE]; struct buffer_head *used[MAX_FEB_SIZE]; struct buffer_head *thrown[MAX_FEB_SIZE]; - int lnum[MAX_HEIGHT]; /* array of number of items which must be - shifted to the left in order to balance the - current node; for leaves includes item that - will be partially shifted; for internal - nodes, it is the number of child pointers - rather than items. It includes the new item - being created. The code sometimes subtracts - one to get the number of wholly shifted - items for other purposes. */ - int rnum[MAX_HEIGHT]; /* substitute right for left in comment above */ - int lkey[MAX_HEIGHT]; /* array indexed by height h mapping the key delimiting L[h] and - S[h] to its item number within the node CFL[h] */ - int rkey[MAX_HEIGHT]; /* substitute r for l in comment above */ - int insert_size[MAX_HEIGHT]; /* the number of bytes by we are trying to add or remove from - S[h]. A negative value means removing. */ - int blknum[MAX_HEIGHT]; /* number of nodes that will replace node S[h] after - balancing on the level h of the tree. If 0 then S is - being deleted, if 1 then S is remaining and no new nodes - are being created, if 2 or 3 then 1 or 2 new nodes is - being created */ + + /* + * array of number of items which must be shifted to the left in + * order to balance the current node; for leaves includes item that + * will be partially shifted; for internal nodes, it is the number + * of child pointers rather than items. It includes the new item + * being created. The code sometimes subtracts one to get the + * number of wholly shifted items for other purposes. + */ + int lnum[MAX_HEIGHT]; + + /* substitute right for left in comment above */ + int rnum[MAX_HEIGHT]; + + /* + * array indexed by height h mapping the key delimiting L[h] and + * S[h] to its item number within the node CFL[h] + */ + int lkey[MAX_HEIGHT]; + + /* substitute r for l in comment above */ + int rkey[MAX_HEIGHT]; + + /* + * the number of bytes by we are trying to add or remove from + * S[h]. A negative value means removing. + */ + int insert_size[MAX_HEIGHT]; + + /* + * number of nodes that will replace node S[h] after balancing + * on the level h of the tree. If 0 then S is being deleted, + * if 1 then S is remaining and no new nodes are being created, + * if 2 or 3 then 1 or 2 new nodes is being created + */ + int blknum[MAX_HEIGHT]; /* fields that are used only for balancing leaves of the tree */ - int cur_blknum; /* number of empty blocks having been already allocated */ - int s0num; /* number of items that fall into left most node when S[0] splits */ - int s1num; /* number of items that fall into first new node when S[0] splits */ - int s2num; /* number of items that fall into second new node when S[0] splits */ - int lbytes; /* number of bytes which can flow to the left neighbor from the left */ - /* most liquid item that cannot be shifted from S[0] entirely */ - /* if -1 then nothing will be partially shifted */ - int rbytes; /* number of bytes which will flow to the right neighbor from the right */ - /* most liquid item that cannot be shifted from S[0] entirely */ - /* if -1 then nothing will be partially shifted */ - int s1bytes; /* number of bytes which flow to the first new node when S[0] splits */ - /* note: if S[0] splits into 3 nodes, then items do not need to be cut */ + + /* number of empty blocks having been already allocated */ + int cur_blknum; + + /* number of items that fall into left most node when S[0] splits */ + int s0num; + + /* number of items that fall into first new node when S[0] splits */ + int s1num; + + /* number of items that fall into second new node when S[0] splits */ + int s2num; + + /* + * number of bytes which can flow to the left neighbor from the left + * most liquid item that cannot be shifted from S[0] entirely + * if -1 then nothing will be partially shifted + */ + int lbytes; + + /* + * number of bytes which will flow to the right neighbor from the right + * most liquid item that cannot be shifted from S[0] entirely + * if -1 then nothing will be partially shifted + */ + int rbytes; + + /* + * number of bytes which flow to the first new node when S[0] splits + * note: if S[0] splits into 3 nodes, then items do not need to be cut + */ + int s1bytes; int s2bytes; - struct buffer_head *buf_to_free[MAX_FREE_BLOCK]; /* buffers which are to be freed after do_balance finishes by unfix_nodes */ - char *vn_buf; /* kmalloced memory. Used to create - virtual node and keep map of - dirtied bitmap blocks */ + + /* + * buffers which are to be freed after do_balance finishes + * by unfix_nodes + */ + struct buffer_head *buf_to_free[MAX_FREE_BLOCK]; + + /* + * kmalloced memory. Used to create virtual node and keep + * map of dirtied bitmap blocks + */ + char *vn_buf; + int vn_buf_size; /* size of the vn_buf */ - struct virtual_node *tb_vn; /* VN starts after bitmap of bitmap blocks */ - int fs_gen; /* saved value of `reiserfs_generation' counter - see FILESYSTEM_CHANGED() macro in reiserfs_fs.h */ + /* VN starts after bitmap of bitmap blocks */ + struct virtual_node *tb_vn; + + /* + * saved value of `reiserfs_generation' counter see + * FILESYSTEM_CHANGED() macro in reiserfs_fs.h + */ + int fs_gen; + #ifdef DISPLACE_NEW_PACKING_LOCALITIES - struct in_core_key key; /* key pointer, to pass to block allocator or - another low-level subsystem */ + /* + * key pointer, to pass to block allocator or + * another low-level subsystem + */ + struct in_core_key key; #endif }; @@ -2183,20 +2534,24 @@ struct tree_balance { /* When inserting an item. */ #define M_INSERT 'i' -/* When inserting into (directories only) or appending onto an already - existent item. */ +/* + * When inserting into (directories only) or appending onto an already + * existent item. + */ #define M_PASTE 'p' /* When deleting an item. */ #define M_DELETE 'd' /* When truncating an item or removing an entry from a (directory) item. */ -#define M_CUT 'c' +#define M_CUT 'c' /* used when balancing on leaf level skipped (in reiserfsck) */ #define M_INTERNAL 'n' -/* When further balancing is not needed, then do_balance does not need - to be called. */ -#define M_SKIP_BALANCING 's' +/* + * When further balancing is not needed, then do_balance does not need + * to be called. + */ +#define M_SKIP_BALANCING 's' #define M_CONVERT 'v' /* modes of leaf_move_items */ @@ -2209,8 +2564,10 @@ struct tree_balance { #define FIRST_TO_LAST 0 #define LAST_TO_FIRST 1 -/* used in do_balance for passing parent of node information that has - been gotten from tb struct */ +/* + * used in do_balance for passing parent of node information that has + * been gotten from tb struct + */ struct buffer_info { struct tree_balance *tb; struct buffer_head *bi_bh; @@ -2228,20 +2585,24 @@ static inline struct super_block *sb_from_bi(struct buffer_info *bi) return bi ? sb_from_tb(bi->tb) : NULL; } -/* there are 4 types of items: stat data, directory item, indirect, direct. -+-------------------+------------+--------------+------------+ -| | k_offset | k_uniqueness | mergeable? | -+-------------------+------------+--------------+------------+ -| stat data | 0 | 0 | no | -+-------------------+------------+--------------+------------+ -| 1st directory item| DOT_OFFSET |DIRENTRY_UNIQUENESS| no | -| non 1st directory | hash value | | yes | -| item | | | | -+-------------------+------------+--------------+------------+ -| indirect item | offset + 1 |TYPE_INDIRECT | if this is not the first indirect item of the object -+-------------------+------------+--------------+------------+ -| direct item | offset + 1 |TYPE_DIRECT | if not this is not the first direct item of the object -+-------------------+------------+--------------+------------+ +/* + * there are 4 types of items: stat data, directory item, indirect, direct. + * +-------------------+------------+--------------+------------+ + * | | k_offset | k_uniqueness | mergeable? | + * +-------------------+------------+--------------+------------+ + * | stat data | 0 | 0 | no | + * +-------------------+------------+--------------+------------+ + * | 1st directory item| DOT_OFFSET | DIRENTRY_ .. | no | + * | non 1st directory | hash value | UNIQUENESS | yes | + * | item | | | | + * +-------------------+------------+--------------+------------+ + * | indirect item | offset + 1 |TYPE_INDIRECT | [1] | + * +-------------------+------------+--------------+------------+ + * | direct item | offset + 1 |TYPE_DIRECT | [2] | + * +-------------------+------------+--------------+------------+ + * + * [1] if this is not the first indirect item of the object + * [2] if this is not the first direct item of the object */ struct item_operations { @@ -2280,22 +2641,30 @@ extern struct item_operations *item_ops[TYPE_ANY + 1]; /* number of blocks pointed to by the indirect item */ #define I_UNFM_NUM(ih) (ih_item_len(ih) / UNFM_P_SIZE) -/* the used space within the unformatted node corresponding to pos within the item pointed to by ih */ +/* + * the used space within the unformatted node corresponding + * to pos within the item pointed to by ih + */ #define I_POS_UNFM_SIZE(ih,pos,size) (((pos) == I_UNFM_NUM(ih) - 1 ) ? (size) - ih_free_space(ih) : (size)) -/* number of bytes contained by the direct item or the unformatted nodes the indirect item points to */ +/* + * number of bytes contained by the direct item or the + * unformatted nodes the indirect item points to + */ - /* following defines use reiserfs buffer header and item header */ +/* following defines use reiserfs buffer header and item header */ /* get stat-data */ #define B_I_STAT_DATA(bh, ih) ( (struct stat_data * )((bh)->b_data + ih_location(ih)) ) -// this is 3976 for size==4096 +/* this is 3976 for size==4096 */ #define MAX_DIRECT_ITEM_LEN(size) ((size) - BLKH_SIZE - 2*IH_SIZE - SD_SIZE - UNFM_P_SIZE) -/* indirect items consist of entries which contain blocknrs, pos - indicates which entry, and B_I_POS_UNFM_POINTER resolves to the - blocknr contained by the entry pos points to */ +/* + * indirect items consist of entries which contain blocknrs, pos + * indicates which entry, and B_I_POS_UNFM_POINTER resolves to the + * blocknr contained by the entry pos points to + */ #define B_I_POS_UNFM_POINTER(bh, ih, pos) \ le32_to_cpu(*(((unp_t *)ih_item_body(bh, ih)) + (pos))) #define PUT_B_I_POS_UNFM_POINTER(bh, ih, pos, val) \ @@ -2306,9 +2675,9 @@ struct reiserfs_iget_args { __u32 dirid; }; -/***************************************************************************/ -/* FUNCTION DECLARATIONS */ -/***************************************************************************/ +/*************************************************************************** + * FUNCTION DECLARATIONS * + ***************************************************************************/ #define get_journal_desc_magic(bh) (bh->b_data + bh->b_size - 12) @@ -2320,7 +2689,10 @@ struct reiserfs_iget_args { /* first block written in a commit. */ struct reiserfs_journal_desc { __le32 j_trans_id; /* id of commit */ - __le32 j_len; /* length of commit. len +1 is the commit block */ + + /* length of commit. len +1 is the commit block */ + __le32 j_len; + __le32 j_mount_id; /* mount id of this trans */ __le32 j_realblock[1]; /* real locations for each block */ }; @@ -2347,22 +2719,35 @@ struct reiserfs_journal_commit { #define set_commit_trans_id(c,val) do { (c)->j_trans_id = cpu_to_le32 (val); } while (0) #define set_commit_trans_len(c,val) do { (c)->j_len = cpu_to_le32 (val); } while (0) -/* this header block gets written whenever a transaction is considered fully flushed, and is more recent than the -** last fully flushed transaction. fully flushed means all the log blocks and all the real blocks are on disk, -** and this transaction does not need to be replayed. -*/ +/* + * this header block gets written whenever a transaction is considered + * fully flushed, and is more recent than the last fully flushed transaction. + * fully flushed means all the log blocks and all the real blocks are on + * disk, and this transaction does not need to be replayed. + */ struct reiserfs_journal_header { - __le32 j_last_flush_trans_id; /* id of last fully flushed transaction */ - __le32 j_first_unflushed_offset; /* offset in the log of where to start replay after a crash */ + /* id of last fully flushed transaction */ + __le32 j_last_flush_trans_id; + + /* offset in the log of where to start replay after a crash */ + __le32 j_first_unflushed_offset; + __le32 j_mount_id; /* 12 */ struct journal_params jh_journal; }; /* biggest tunable defines are right here */ #define JOURNAL_BLOCK_COUNT 8192 /* number of blocks in the journal */ -#define JOURNAL_TRANS_MAX_DEFAULT 1024 /* biggest possible single transaction, don't change for now (8/3/99) */ + +/* biggest possible single transaction, don't change for now (8/3/99) */ +#define JOURNAL_TRANS_MAX_DEFAULT 1024 #define JOURNAL_TRANS_MIN_DEFAULT 256 -#define JOURNAL_MAX_BATCH_DEFAULT 900 /* max blocks to batch into one transaction, don't make this any bigger than 900 */ + +/* + * max blocks to batch into one transaction, + * don't make this any bigger than 900 + */ +#define JOURNAL_MAX_BATCH_DEFAULT 900 #define JOURNAL_MIN_RATIO 2 #define JOURNAL_MAX_COMMIT_AGE 30 #define JOURNAL_MAX_TRANS_AGE 30 @@ -2387,16 +2772,18 @@ struct reiserfs_journal_header { #define REISERFS_QUOTA_DEL_BLOCKS(s) 0 #endif -/* both of these can be as low as 1, or as high as you want. The min is the -** number of 4k bitmap nodes preallocated on mount. New nodes are allocated -** as needed, and released when transactions are committed. On release, if -** the current number of nodes is > max, the node is freed, otherwise, -** it is put on a free list for faster use later. +/* + * both of these can be as low as 1, or as high as you want. The min is the + * number of 4k bitmap nodes preallocated on mount. New nodes are allocated + * as needed, and released when transactions are committed. On release, if + * the current number of nodes is > max, the node is freed, otherwise, + * it is put on a free list for faster use later. */ #define REISERFS_MIN_BITMAP_NODES 10 #define REISERFS_MAX_BITMAP_NODES 100 -#define JBH_HASH_SHIFT 13 /* these are based on journal hash size of 8192 */ +/* these are based on journal hash size of 8192 */ +#define JBH_HASH_SHIFT 13 #define JBH_HASH_MASK 8191 #define _jhashfn(sb,block) \ @@ -2404,7 +2791,7 @@ struct reiserfs_journal_header { (((block)<<(JBH_HASH_SHIFT - 6)) ^ ((block) >> 13) ^ ((block) << (JBH_HASH_SHIFT - 12)))) #define journal_hash(t,sb,block) ((t)[_jhashfn((sb),(block)) & JBH_HASH_MASK]) -// We need these to make journal.c code more readable +/* We need these to make journal.c code more readable */ #define journal_find_get_block(s, block) __find_get_block(SB_JOURNAL(s)->j_dev_bd, block, s->s_blocksize) #define journal_getblk(s, block) __getblk(SB_JOURNAL(s)->j_dev_bd, block, s->s_blocksize) #define journal_bread(s, block) __bread(SB_JOURNAL(s)->j_dev_bd, block, s->s_blocksize) @@ -2412,12 +2799,14 @@ struct reiserfs_journal_header { enum reiserfs_bh_state_bits { BH_JDirty = BH_PrivateStart, /* buffer is in current transaction */ BH_JDirty_wait, - BH_JNew, /* disk block was taken off free list before - * being in a finished transaction, or - * written to disk. Can be reused immed. */ + /* + * disk block was taken off free list before being in a + * finished transaction, or written to disk. Can be reused immed. + */ + BH_JNew, BH_JPrepared, BH_JRestore_dirty, - BH_JTest, // debugging only will go away + BH_JTest, /* debugging only will go away */ }; BUFFER_FNS(JDirty, journaled); @@ -2433,27 +2822,36 @@ TAS_BUFFER_FNS(JRestore_dirty, journal_restore_dirty); BUFFER_FNS(JTest, journal_test); TAS_BUFFER_FNS(JTest, journal_test); -/* -** transaction handle which is passed around for all journal calls -*/ +/* transaction handle which is passed around for all journal calls */ struct reiserfs_transaction_handle { - struct super_block *t_super; /* super for this FS when journal_begin was - called. saves calls to reiserfs_get_super - also used by nested transactions to make - sure they are nesting on the right FS - _must_ be first in the handle - */ + /* + * super for this FS when journal_begin was called. saves calls to + * reiserfs_get_super also used by nested transactions to make + * sure they are nesting on the right FS _must_ be first + * in the handle + */ + struct super_block *t_super; + int t_refcount; int t_blocks_logged; /* number of blocks this writer has logged */ int t_blocks_allocated; /* number of blocks this writer allocated */ - unsigned int t_trans_id; /* sanity check, equals the current trans id */ + + /* sanity check, equals the current trans id */ + unsigned int t_trans_id; + void *t_handle_save; /* save existing current->journal_info */ - unsigned displace_new_blocks:1; /* if new block allocation occurres, that block - should be displaced from others */ + + /* + * if new block allocation occurres, that block + * should be displaced from others + */ + unsigned displace_new_blocks:1; + struct list_head t_list; }; -/* used to keep track of ordered and tail writes, attached to the buffer +/* + * used to keep track of ordered and tail writes, attached to the buffer * head through b_journal_head. */ struct reiserfs_jh { @@ -2550,20 +2948,18 @@ int B_IS_IN_TREE(const struct buffer_head *); extern void copy_item_head(struct item_head *to, const struct item_head *from); -// first key is in cpu form, second - le +/* first key is in cpu form, second - le */ extern int comp_short_keys(const struct reiserfs_key *le_key, const struct cpu_key *cpu_key); extern void le_key2cpu_key(struct cpu_key *to, const struct reiserfs_key *from); -// both are in le form +/* both are in le form */ extern int comp_le_keys(const struct reiserfs_key *, const struct reiserfs_key *); extern int comp_short_le_keys(const struct reiserfs_key *, const struct reiserfs_key *); -// -// get key version from on disk key - kludge -// +/* * get key version from on disk key - kludge */ static inline int le_key_version(const struct reiserfs_key *key) { int type; @@ -2640,12 +3036,12 @@ void padd_item(char *item, int total_length, int length); /* inode.c */ /* args for the create parameter of reiserfs_get_block */ -#define GET_BLOCK_NO_CREATE 0 /* don't create new blocks or convert tails */ -#define GET_BLOCK_CREATE 1 /* add anything you need to find block */ -#define GET_BLOCK_NO_HOLE 2 /* return -ENOENT for file holes */ -#define GET_BLOCK_READ_DIRECT 4 /* read the tail if indirect item not found */ -#define GET_BLOCK_NO_IMUX 8 /* i_mutex is not held, don't preallocate */ -#define GET_BLOCK_NO_DANGLE 16 /* don't leave any transactions running */ +#define GET_BLOCK_NO_CREATE 0 /* don't create new blocks or convert tails */ +#define GET_BLOCK_CREATE 1 /* add anything you need to find block */ +#define GET_BLOCK_NO_HOLE 2 /* return -ENOENT for file holes */ +#define GET_BLOCK_READ_DIRECT 4 /* read the tail if indirect item not found */ +#define GET_BLOCK_NO_IMUX 8 /* i_mutex is not held, don't preallocate */ +#define GET_BLOCK_NO_DANGLE 16 /* don't leave any transactions running */ void reiserfs_read_locked_inode(struct inode *inode, struct reiserfs_iget_args *args); @@ -2844,25 +3240,49 @@ struct buffer_head *get_FEB(struct tree_balance *); /* bitmap.c */ -/* structure contains hints for block allocator, and it is a container for - * arguments, such as node, search path, transaction_handle, etc. */ +/* + * structure contains hints for block allocator, and it is a container for + * arguments, such as node, search path, transaction_handle, etc. + */ struct __reiserfs_blocknr_hint { - struct inode *inode; /* inode passed to allocator, if we allocate unf. nodes */ + /* inode passed to allocator, if we allocate unf. nodes */ + struct inode *inode; + sector_t block; /* file offset, in blocks */ struct in_core_key key; - struct treepath *path; /* search path, used by allocator to deternine search_start by - * various ways */ - struct reiserfs_transaction_handle *th; /* transaction handle is needed to log super blocks and - * bitmap blocks changes */ + + /* + * search path, used by allocator to deternine search_start by + * various ways + */ + struct treepath *path; + + /* + * transaction handle is needed to log super blocks + * and bitmap blocks changes + */ + struct reiserfs_transaction_handle *th; + b_blocknr_t beg, end; - b_blocknr_t search_start; /* a field used to transfer search start value (block number) - * between different block allocator procedures - * (determine_search_start() and others) */ - int prealloc_size; /* is set in determine_prealloc_size() function, used by underlayed - * function that do actual allocation */ - - unsigned formatted_node:1; /* the allocator uses different polices for getting disk space for - * formatted/unformatted blocks with/without preallocation */ + + /* + * a field used to transfer search start value (block number) + * between different block allocator procedures + * (determine_search_start() and others) + */ + b_blocknr_t search_start; + + /* + * is set in determine_prealloc_size() function, + * used by underlayed function that do actual allocation + */ + int prealloc_size; + + /* + * the allocator uses different polices for getting disk + * space for formatted/unformatted blocks with/without preallocation + */ + unsigned formatted_node:1; unsigned preallocate:1; }; @@ -2956,13 +3376,15 @@ __u32 r5_hash(const signed char *msg, int len); #define reiserfs_test_le_bit test_bit_le #define reiserfs_find_next_zero_le_bit find_next_zero_bit_le -/* sometimes reiserfs_truncate may require to allocate few new blocks - to perform indirect2direct conversion. People probably used to - think, that truncate should work without problems on a filesystem - without free disk space. They may complain that they can not - truncate due to lack of free disk space. This spare space allows us - to not worry about it. 500 is probably too much, but it should be - absolutely safe */ +/* + * sometimes reiserfs_truncate may require to allocate few new blocks + * to perform indirect2direct conversion. People probably used to + * think, that truncate should work without problems on a filesystem + * without free disk space. They may complain that they can not + * truncate due to lack of free disk space. This spare space allows us + * to not worry about it. 500 is probably too much, but it should be + * absolutely safe + */ #define SPARE_SPACE 500 /* prototypes from ioctl.c */ diff --git a/fs/reiserfs/resize.c b/fs/reiserfs/resize.c index a4ef5cd606eb..037b00c40f1f 100644 --- a/fs/reiserfs/resize.c +++ b/fs/reiserfs/resize.c @@ -53,8 +53,10 @@ int reiserfs_resize(struct super_block *s, unsigned long block_count_new) } bforget(bh); - /* old disk layout detection; those partitions can be mounted, but - * cannot be resized */ + /* + * old disk layout detection; those partitions can be mounted, but + * cannot be resized + */ if (SB_BUFFER_WITH_SB(s)->b_blocknr * SB_BUFFER_WITH_SB(s)->b_size != REISERFS_DISK_OFFSET_IN_BYTES) { printk @@ -86,12 +88,14 @@ int reiserfs_resize(struct super_block *s, unsigned long block_count_new) ("reiserfs_resize: unable to allocate memory for journal bitmaps\n"); return -ENOMEM; } - /* the new journal bitmaps are zero filled, now we copy in the bitmap - ** node pointers from the old journal bitmap structs, and then - ** transfer the new data structures into the journal struct. - ** - ** using the copy_size var below allows this code to work for - ** both shrinking and expanding the FS. + /* + * the new journal bitmaps are zero filled, now we copy i + * the bitmap node pointers from the old journal bitmap + * structs, and then transfer the new data structures + * into the journal struct. + * + * using the copy_size var below allows this code to work for + * both shrinking and expanding the FS. */ copy_size = bmap_nr_new < bmap_nr ? bmap_nr_new : bmap_nr; copy_size = @@ -101,36 +105,45 @@ int reiserfs_resize(struct super_block *s, unsigned long block_count_new) jb = SB_JOURNAL(s)->j_list_bitmap + i; memcpy(jbitmap[i].bitmaps, jb->bitmaps, copy_size); - /* just in case vfree schedules on us, copy the new - ** pointer into the journal struct before freeing the - ** old one + /* + * just in case vfree schedules on us, copy the new + * pointer into the journal struct before freeing the + * old one */ node_tmp = jb->bitmaps; jb->bitmaps = jbitmap[i].bitmaps; vfree(node_tmp); } - /* allocate additional bitmap blocks, reallocate array of bitmap - * block pointers */ + /* + * allocate additional bitmap blocks, reallocate + * array of bitmap block pointers + */ bitmap = vzalloc(sizeof(struct reiserfs_bitmap_info) * bmap_nr_new); if (!bitmap) { - /* Journal bitmaps are still supersized, but the memory isn't - * leaked, so I guess it's ok */ + /* + * Journal bitmaps are still supersized, but the + * memory isn't leaked, so I guess it's ok + */ printk("reiserfs_resize: unable to allocate memory.\n"); return -ENOMEM; } for (i = 0; i < bmap_nr; i++) bitmap[i] = old_bitmap[i]; - /* This doesn't go through the journal, but it doesn't have to. - * The changes are still atomic: We're synced up when the journal - * transaction begins, and the new bitmaps don't matter if the - * transaction fails. */ + /* + * This doesn't go through the journal, but it doesn't have to. + * The changes are still atomic: We're synced up when the + * journal transaction begins, and the new bitmaps don't + * matter if the transaction fails. + */ for (i = bmap_nr; i < bmap_nr_new; i++) { int depth; - /* don't use read_bitmap_block since it will cache - * the uninitialized bitmap */ + /* + * don't use read_bitmap_block since it will cache + * the uninitialized bitmap + */ depth = reiserfs_write_unlock_nested(s); bh = sb_bread(s, i * s->s_blocksize * 8); reiserfs_write_lock_nested(s, depth); @@ -147,7 +160,7 @@ int reiserfs_resize(struct super_block *s, unsigned long block_count_new) depth = reiserfs_write_unlock_nested(s); sync_dirty_buffer(bh); reiserfs_write_lock_nested(s, depth); - // update bitmap_info stuff + /* update bitmap_info stuff */ bitmap[i].free_count = sb_blocksize(sb) * 8 - 1; brelse(bh); } @@ -156,9 +169,11 @@ int reiserfs_resize(struct super_block *s, unsigned long block_count_new) vfree(old_bitmap); } - /* begin transaction, if there was an error, it's fine. Yes, we have + /* + * begin transaction, if there was an error, it's fine. Yes, we have * incorrect bitmaps now, but none of it is ever going to touch the - * disk anyway. */ + * disk anyway. + */ err = journal_begin(&th, s, 10); if (err) return err; diff --git a/fs/reiserfs/stree.c b/fs/reiserfs/stree.c index 40b3e77c8ff3..aa86757e48f8 100644 --- a/fs/reiserfs/stree.c +++ b/fs/reiserfs/stree.c @@ -8,46 +8,6 @@ * Pereslavl-Zalessky Russia */ -/* - * This file contains functions dealing with S+tree - * - * B_IS_IN_TREE - * copy_item_head - * comp_short_keys - * comp_keys - * comp_short_le_keys - * le_key2cpu_key - * comp_le_keys - * bin_search - * get_lkey - * get_rkey - * key_in_buffer - * decrement_bcount - * reiserfs_check_path - * pathrelse_and_restore - * pathrelse - * search_by_key_reada - * search_by_key - * search_for_position_by_key - * comp_items - * prepare_for_direct_item - * prepare_for_direntry_item - * prepare_for_delete_or_cut - * calc_deleted_bytes_number - * init_tb_struct - * padd_item - * reiserfs_delete_item - * reiserfs_delete_solid_item - * reiserfs_delete_object - * maybe_indirect_to_direct - * indirect_to_direct_roll_back - * reiserfs_cut_from_item - * truncate_directory - * reiserfs_do_truncate - * reiserfs_paste_into_item - * reiserfs_insert_item - */ - #include <linux/time.h> #include <linux/string.h> #include <linux/pagemap.h> @@ -65,21 +25,21 @@ inline int B_IS_IN_TREE(const struct buffer_head *bh) return (B_LEVEL(bh) != FREE_LEVEL); } -// -// to gets item head in le form -// +/* to get item head in le form */ inline void copy_item_head(struct item_head *to, const struct item_head *from) { memcpy(to, from, IH_SIZE); } -/* k1 is pointer to on-disk structure which is stored in little-endian - form. k2 is pointer to cpu variable. For key of items of the same - object this returns 0. - Returns: -1 if key1 < key2 - 0 if key1 == key2 - 1 if key1 > key2 */ +/* + * k1 is pointer to on-disk structure which is stored in little-endian + * form. k2 is pointer to cpu variable. For key of items of the same + * object this returns 0. + * Returns: -1 if key1 < key2 + * 0 if key1 == key2 + * 1 if key1 > key2 + */ inline int comp_short_keys(const struct reiserfs_key *le_key, const struct cpu_key *cpu_key) { @@ -97,11 +57,13 @@ inline int comp_short_keys(const struct reiserfs_key *le_key, return 0; } -/* k1 is pointer to on-disk structure which is stored in little-endian - form. k2 is pointer to cpu variable. - Compare keys using all 4 key fields. - Returns: -1 if key1 < key2 0 - if key1 = key2 1 if key1 > key2 */ +/* + * k1 is pointer to on-disk structure which is stored in little-endian + * form. k2 is pointer to cpu variable. + * Compare keys using all 4 key fields. + * Returns: -1 if key1 < key2 0 + * if key1 = key2 1 if key1 > key2 + */ static inline int comp_keys(const struct reiserfs_key *le_key, const struct cpu_key *cpu_key) { @@ -155,15 +117,17 @@ inline void le_key2cpu_key(struct cpu_key *to, const struct reiserfs_key *from) to->on_disk_key.k_dir_id = le32_to_cpu(from->k_dir_id); to->on_disk_key.k_objectid = le32_to_cpu(from->k_objectid); - // find out version of the key + /* find out version of the key */ version = le_key_version(from); to->version = version; to->on_disk_key.k_offset = le_key_k_offset(version, from); to->on_disk_key.k_type = le_key_k_type(version, from); } -// this does not say which one is bigger, it only returns 1 if keys -// are not equal, 0 otherwise +/* + * this does not say which one is bigger, it only returns 1 if keys + * are not equal, 0 otherwise + */ inline int comp_le_keys(const struct reiserfs_key *k1, const struct reiserfs_key *k2) { @@ -177,24 +141,27 @@ inline int comp_le_keys(const struct reiserfs_key *k1, * *pos = number of the searched element if found, else the * * number of the first element that is larger than key. * **************************************************************************/ -/* For those not familiar with binary search: lbound is the leftmost item that it - could be, rbound the rightmost item that it could be. We examine the item - halfway between lbound and rbound, and that tells us either that we can increase - lbound, or decrease rbound, or that we have found it, or if lbound <= rbound that - there are no possible items, and we have not found it. With each examination we - cut the number of possible items it could be by one more than half rounded down, - or we find it. */ +/* + * For those not familiar with binary search: lbound is the leftmost item + * that it could be, rbound the rightmost item that it could be. We examine + * the item halfway between lbound and rbound, and that tells us either + * that we can increase lbound, or decrease rbound, or that we have found it, + * or if lbound <= rbound that there are no possible items, and we have not + * found it. With each examination we cut the number of possible items it + * could be by one more than half rounded down, or we find it. + */ static inline int bin_search(const void *key, /* Key to search for. */ const void *base, /* First item in the array. */ int num, /* Number of items in the array. */ - int width, /* Item size in the array. - searched. Lest the reader be - confused, note that this is crafted - as a general function, and when it - is applied specifically to the array - of item headers in a node, width - is actually the item header size not - the item size. */ + /* + * Item size in the array. searched. Lest the + * reader be confused, note that this is crafted + * as a general function, and when it is applied + * specifically to the array of item headers in a + * node, width is actually the item header size + * not the item size. + */ + int width, int *pos /* Number of the searched for element. */ ) { @@ -216,8 +183,10 @@ static inline int bin_search(const void *key, /* Key to search for. */ return ITEM_FOUND; /* Key found in the array. */ } - /* bin_search did not find given key, it returns position of key, - that is minimal and greater than the given one. */ + /* + * bin_search did not find given key, it returns position of key, + * that is minimal and greater than the given one. + */ *pos = lbound; return ITEM_NOT_FOUND; } @@ -234,10 +203,14 @@ static const struct reiserfs_key MAX_KEY = { __constant_cpu_to_le32(0xffffffff)},} }; -/* Get delimiting key of the buffer by looking for it in the buffers in the path, starting from the bottom - of the path, and going upwards. We must check the path's validity at each step. If the key is not in - the path, there is no delimiting key in the tree (buffer is first or last buffer in tree), and in this - case we return a special key, either MIN_KEY or MAX_KEY. */ +/* + * Get delimiting key of the buffer by looking for it in the buffers in the + * path, starting from the bottom of the path, and going upwards. We must + * check the path's validity at each step. If the key is not in the path, + * there is no delimiting key in the tree (buffer is first or last buffer + * in tree), and in this case we return a special key, either MIN_KEY or + * MAX_KEY. + */ static inline const struct reiserfs_key *get_lkey(const struct treepath *chk_path, const struct super_block *sb) { @@ -270,7 +243,10 @@ static inline const struct reiserfs_key *get_lkey(const struct treepath *chk_pat PATH_OFFSET_PBUFFER(chk_path, path_offset + 1)->b_blocknr) return &MAX_KEY; - /* Return delimiting key if position in the parent is not equal to zero. */ + /* + * Return delimiting key if position in the parent + * is not equal to zero. + */ if (position) return internal_key(parent, position - 1); } @@ -308,15 +284,23 @@ inline const struct reiserfs_key *get_rkey(const struct treepath *chk_path, path_offset)) > B_NR_ITEMS(parent)) return &MIN_KEY; - /* Check whether parent at the path really points to the child. */ + /* + * Check whether parent at the path really points + * to the child. + */ if (B_N_CHILD_NUM(parent, position) != PATH_OFFSET_PBUFFER(chk_path, path_offset + 1)->b_blocknr) return &MIN_KEY; - /* Return delimiting key if position in the parent is not the last one. */ + + /* + * Return delimiting key if position in the parent + * is not the last one. + */ if (position != B_NR_ITEMS(parent)) return internal_key(parent, position); } + /* Return MAX_KEY if we are in the root of the buffer tree. */ if (PATH_OFFSET_PBUFFER(chk_path, FIRST_PATH_ELEMENT_OFFSET)-> b_blocknr == SB_ROOT_BLOCK(sb)) @@ -324,13 +308,20 @@ inline const struct reiserfs_key *get_rkey(const struct treepath *chk_path, return &MIN_KEY; } -/* Check whether a key is contained in the tree rooted from a buffer at a path. */ -/* This works by looking at the left and right delimiting keys for the buffer in the last path_element in - the path. These delimiting keys are stored at least one level above that buffer in the tree. If the - buffer is the first or last node in the tree order then one of the delimiting keys may be absent, and in - this case get_lkey and get_rkey return a special key which is MIN_KEY or MAX_KEY. */ -static inline int key_in_buffer(struct treepath *chk_path, /* Path which should be checked. */ - const struct cpu_key *key, /* Key which should be checked. */ +/* + * Check whether a key is contained in the tree rooted from a buffer at a path. + * This works by looking at the left and right delimiting keys for the buffer + * in the last path_element in the path. These delimiting keys are stored + * at least one level above that buffer in the tree. If the buffer is the + * first or last node in the tree order then one of the delimiting keys may + * be absent, and in this case get_lkey and get_rkey return a special key + * which is MIN_KEY or MAX_KEY. + */ +static inline int key_in_buffer( + /* Path which should be checked. */ + struct treepath *chk_path, + /* Key which should be checked. */ + const struct cpu_key *key, struct super_block *sb ) { @@ -359,9 +350,11 @@ int reiserfs_check_path(struct treepath *p) return 0; } -/* Drop the reference to each buffer in a path and restore +/* + * Drop the reference to each buffer in a path and restore * dirty bits clean when preparing the buffer for the log. - * This version should only be called from fix_nodes() */ + * This version should only be called from fix_nodes() + */ void pathrelse_and_restore(struct super_block *sb, struct treepath *search_path) { @@ -418,14 +411,17 @@ static int is_leaf(char *buf, int blocksize, struct buffer_head *bh) } ih = (struct item_head *)(buf + BLKH_SIZE) + nr - 1; used_space = BLKH_SIZE + IH_SIZE * nr + (blocksize - ih_location(ih)); + + /* free space does not match to calculated amount of use space */ if (used_space != blocksize - blkh_free_space(blkh)) { - /* free space does not match to calculated amount of use space */ reiserfs_warning(NULL, "reiserfs-5082", "free space seems wrong: %z", bh); return 0; } - // FIXME: it is_leaf will hit performance too much - we may have - // return 1 here + /* + * FIXME: it is_leaf will hit performance too much - we may have + * return 1 here + */ /* check tables of item heads */ ih = (struct item_head *)(buf + BLKH_SIZE); @@ -460,7 +456,7 @@ static int is_leaf(char *buf, int blocksize, struct buffer_head *bh) prev_location = ih_location(ih); } - // one may imagine much more checks + /* one may imagine many more checks */ return 1; } @@ -481,8 +477,8 @@ static int is_internal(char *buf, int blocksize, struct buffer_head *bh) } nr = blkh_nr_item(blkh); + /* for internal which is not root we might check min number of keys */ if (nr > (blocksize - BLKH_SIZE - DC_SIZE) / (KEY_SIZE + DC_SIZE)) { - /* for internal which is not root we might check min number of keys */ reiserfs_warning(NULL, "reiserfs-5088", "number of key seems wrong: %z", bh); return 0; @@ -494,12 +490,15 @@ static int is_internal(char *buf, int blocksize, struct buffer_head *bh) "free space seems wrong: %z", bh); return 0; } - // one may imagine much more checks + + /* one may imagine many more checks */ return 1; } -// make sure that bh contains formatted node of reiserfs tree of -// 'level'-th level +/* + * make sure that bh contains formatted node of reiserfs tree of + * 'level'-th level + */ static int is_tree_node(struct buffer_head *bh, int level) { if (B_LEVEL(bh) != level) { @@ -546,7 +545,8 @@ static int search_by_key_reada(struct super_block *s, for (j = 0; j < i; j++) { /* * note, this needs attention if we are getting rid of the BKL - * you have to make sure the prepared bit isn't set on this buffer + * you have to make sure the prepared bit isn't set on this + * buffer */ if (!buffer_uptodate(bh[j])) { if (depth == -1) @@ -558,39 +558,34 @@ static int search_by_key_reada(struct super_block *s, return depth; } -/************************************************************************** - * Algorithm SearchByKey * - * look for item in the Disk S+Tree by its key * - * Input: sb - super block * - * key - pointer to the key to search * - * Output: ITEM_FOUND, ITEM_NOT_FOUND or IO_ERROR * - * search_path - path from the root to the needed leaf * - **************************************************************************/ - -/* This function fills up the path from the root to the leaf as it - descends the tree looking for the key. It uses reiserfs_bread to - try to find buffers in the cache given their block number. If it - does not find them in the cache it reads them from disk. For each - node search_by_key finds using reiserfs_bread it then uses - bin_search to look through that node. bin_search will find the - position of the block_number of the next node if it is looking - through an internal node. If it is looking through a leaf node - bin_search will find the position of the item which has key either - equal to given key, or which is the maximal key less than the given - key. search_by_key returns a path that must be checked for the - correctness of the top of the path but need not be checked for the - correctness of the bottom of the path */ -/* The function is NOT SCHEDULE-SAFE! */ -int search_by_key(struct super_block *sb, const struct cpu_key *key, /* Key to search. */ - struct treepath *search_path,/* This structure was - allocated and initialized - by the calling - function. It is filled up - by this function. */ - int stop_level /* How far down the tree to search. To - stop at leaf level - set to - DISK_LEAF_NODE_LEVEL */ - ) +/* + * This function fills up the path from the root to the leaf as it + * descends the tree looking for the key. It uses reiserfs_bread to + * try to find buffers in the cache given their block number. If it + * does not find them in the cache it reads them from disk. For each + * node search_by_key finds using reiserfs_bread it then uses + * bin_search to look through that node. bin_search will find the + * position of the block_number of the next node if it is looking + * through an internal node. If it is looking through a leaf node + * bin_search will find the position of the item which has key either + * equal to given key, or which is the maximal key less than the given + * key. search_by_key returns a path that must be checked for the + * correctness of the top of the path but need not be checked for the + * correctness of the bottom of the path + */ +/* + * search_by_key - search for key (and item) in stree + * @sb: superblock + * @key: pointer to key to search for + * @search_path: Allocated and initialized struct treepath; Returned filled + * on success. + * @stop_level: How far down the tree to search, Use DISK_LEAF_NODE_LEVEL to + * stop at leaf level. + * + * The function is NOT SCHEDULE-SAFE! + */ +int search_by_key(struct super_block *sb, const struct cpu_key *key, + struct treepath *search_path, int stop_level) { b_blocknr_t block_number; int expected_level; @@ -609,17 +604,22 @@ int search_by_key(struct super_block *sb, const struct cpu_key *key, /* Key to s PROC_INFO_INC(sb, search_by_key); - /* As we add each node to a path we increase its count. This means that - we must be careful to release all nodes in a path before we either - discard the path struct or re-use the path struct, as we do here. */ + /* + * As we add each node to a path we increase its count. This means + * that we must be careful to release all nodes in a path before we + * either discard the path struct or re-use the path struct, as we + * do here. + */ pathrelse(search_path); right_neighbor_of_leaf_node = 0; - /* With each iteration of this loop we search through the items in the - current node, and calculate the next current node(next path element) - for the next iteration of this loop.. */ + /* + * With each iteration of this loop we search through the items in the + * current node, and calculate the next current node(next path element) + * for the next iteration of this loop.. + */ block_number = SB_ROOT_BLOCK(sb); expected_level = -1; while (1) { @@ -639,8 +639,10 @@ int search_by_key(struct super_block *sb, const struct cpu_key *key, /* Key to s ++search_path->path_length); fs_gen = get_generation(sb); - /* Read the next tree node, and set the last element in the path to - have a pointer to it. */ + /* + * Read the next tree node, and set the last element + * in the path to have a pointer to it. + */ if ((bh = last_element->pe_buffer = sb_getblk(sb, block_number))) { @@ -676,9 +678,12 @@ int search_by_key(struct super_block *sb, const struct cpu_key *key, /* Key to s expected_level = SB_TREE_HEIGHT(sb); expected_level--; - /* It is possible that schedule occurred. We must check whether the key - to search is still in the tree rooted from the current buffer. If - not then repeat search from the root. */ + /* + * It is possible that schedule occurred. We must check + * whether the key to search is still in the tree rooted + * from the current buffer. If not then repeat search + * from the root. + */ if (fs_changed(fs_gen, sb) && (!B_IS_IN_TREE(bh) || B_LEVEL(bh) != expected_level || @@ -689,8 +694,10 @@ int search_by_key(struct super_block *sb, const struct cpu_key *key, /* Key to s sbk_restarted[expected_level - 1]); pathrelse(search_path); - /* Get the root block number so that we can repeat the search - starting from the root. */ + /* + * Get the root block number so that we can + * repeat the search starting from the root. + */ block_number = SB_ROOT_BLOCK(sb); expected_level = -1; right_neighbor_of_leaf_node = 0; @@ -699,9 +706,11 @@ int search_by_key(struct super_block *sb, const struct cpu_key *key, /* Key to s continue; } - /* only check that the key is in the buffer if key is not - equal to the MAX_KEY. Latter case is only possible in - "finish_unfinished()" processing during mount. */ + /* + * only check that the key is in the buffer if key is not + * equal to the MAX_KEY. Latter case is only possible in + * "finish_unfinished()" processing during mount. + */ RFALSE(comp_keys(&MAX_KEY, key) && !key_in_buffer(search_path, key, sb), "PAP-5130: key is not in the buffer"); @@ -713,8 +722,10 @@ int search_by_key(struct super_block *sb, const struct cpu_key *key, /* Key to s } #endif - // make sure, that the node contents look like a node of - // certain level + /* + * make sure, that the node contents look like a node of + * certain level + */ if (!is_tree_node(bh, expected_level)) { reiserfs_error(sb, "vs-5150", "invalid format found in block %ld. " @@ -743,21 +754,31 @@ int search_by_key(struct super_block *sb, const struct cpu_key *key, /* Key to s } /* we are not in the stop level */ + /* + * item has been found, so we choose the pointer which + * is to the right of the found one + */ if (retval == ITEM_FOUND) - /* item has been found, so we choose the pointer which is to the right of the found one */ last_element->pe_position++; - /* if item was not found we choose the position which is to - the left of the found item. This requires no code, - bin_search did it already. */ + /* + * if item was not found we choose the position which is to + * the left of the found item. This requires no code, + * bin_search did it already. + */ - /* So we have chosen a position in the current node which is - an internal node. Now we calculate child block number by - position in the node. */ + /* + * So we have chosen a position in the current node which is + * an internal node. Now we calculate child block number by + * position in the node. + */ block_number = B_N_CHILD_NUM(bh, last_element->pe_position); - /* if we are going to read leaf nodes, try for read ahead as well */ + /* + * if we are going to read leaf nodes, try for read + * ahead as well + */ if ((search_path->reada & PATH_READA) && node_level == DISK_LEAF_NODE_LEVEL + 1) { int pos = last_element->pe_position; @@ -789,26 +810,28 @@ int search_by_key(struct super_block *sb, const struct cpu_key *key, /* Key to s } } -/* Form the path to an item and position in this item which contains - file byte defined by key. If there is no such item - corresponding to the key, we point the path to the item with - maximal key less than key, and *pos_in_item is set to one - past the last entry/byte in the item. If searching for entry in a - directory item, and it is not found, *pos_in_item is set to one - entry more than the entry with maximal key which is less than the - sought key. - - Note that if there is no entry in this same node which is one more, - then we point to an imaginary entry. for direct items, the - position is in units of bytes, for indirect items the position is - in units of blocknr entries, for directory items the position is in - units of directory entries. */ - +/* + * Form the path to an item and position in this item which contains + * file byte defined by key. If there is no such item + * corresponding to the key, we point the path to the item with + * maximal key less than key, and *pos_in_item is set to one + * past the last entry/byte in the item. If searching for entry in a + * directory item, and it is not found, *pos_in_item is set to one + * entry more than the entry with maximal key which is less than the + * sought key. + * + * Note that if there is no entry in this same node which is one more, + * then we point to an imaginary entry. for direct items, the + * position is in units of bytes, for indirect items the position is + * in units of blocknr entries, for directory items the position is in + * units of directory entries. + */ /* The function is NOT SCHEDULE-SAFE! */ -int search_for_position_by_key(struct super_block *sb, /* Pointer to the super block. */ - const struct cpu_key *p_cpu_key, /* Key to search (cpu variable) */ - struct treepath *search_path /* Filled up by this function. */ - ) +int search_for_position_by_key(struct super_block *sb, + /* Key to search (cpu variable) */ + const struct cpu_key *p_cpu_key, + /* Filled up by this function. */ + struct treepath *search_path) { struct item_head *p_le_ih; /* pointer to on-disk structure */ int blk_size; @@ -851,7 +874,8 @@ int search_for_position_by_key(struct super_block *sb, /* Pointer to the super b if (comp_short_keys(&(p_le_ih->ih_key), p_cpu_key)) { return FILE_NOT_FOUND; } - // FIXME: quite ugly this far + + /* FIXME: quite ugly this far */ item_offset = le_ih_k_offset(p_le_ih); offset = cpu_key_k_offset(p_cpu_key); @@ -866,8 +890,10 @@ int search_for_position_by_key(struct super_block *sb, /* Pointer to the super b return POSITION_FOUND; } - /* Needed byte is not contained in the item pointed to by the - path. Set pos_in_item out of the item. */ + /* + * Needed byte is not contained in the item pointed to by the + * path. Set pos_in_item out of the item. + */ if (is_indirect_le_ih(p_le_ih)) pos_in_item(search_path) = ih_item_len(p_le_ih) / UNFM_P_SIZE; @@ -896,15 +922,13 @@ int comp_items(const struct item_head *stored_ih, const struct treepath *path) return memcmp(stored_ih, ih, IH_SIZE); } -/* unformatted nodes are not logged anymore, ever. This is safe -** now -*/ +/* unformatted nodes are not logged anymore, ever. This is safe now */ #define held_by_others(bh) (atomic_read(&(bh)->b_count) > 1) -// block can not be forgotten as it is in I/O or held by someone +/* block can not be forgotten as it is in I/O or held by someone */ #define block_in_use(bh) (buffer_locked(bh) || (held_by_others(bh))) -// prepare for delete or cut of direct item +/* prepare for delete or cut of direct item */ static inline int prepare_for_direct_item(struct treepath *path, struct item_head *le_ih, struct inode *inode, @@ -917,9 +941,8 @@ static inline int prepare_for_direct_item(struct treepath *path, *cut_size = -(IH_SIZE + ih_item_len(le_ih)); return M_DELETE; } - // new file gets truncated + /* new file gets truncated */ if (get_inode_item_key_version(inode) == KEY_FORMAT_3_6) { - // round_len = ROUND_UP(new_file_length); /* this was new_file_length < le_ih ... */ if (round_len < le_ih_k_offset(le_ih)) { @@ -933,12 +956,13 @@ static inline int prepare_for_direct_item(struct treepath *path, return M_CUT; /* Cut from this item. */ } - // old file: items may have any length + /* old file: items may have any length */ if (new_file_length < le_ih_k_offset(le_ih)) { *cut_size = -(IH_SIZE + ih_item_len(le_ih)); return M_DELETE; /* Delete this item. */ } + /* Calculate first position and size for cutting from item. */ *cut_size = -(ih_item_len(le_ih) - (pos_in_item(path) = @@ -957,12 +981,15 @@ static inline int prepare_for_direntry_item(struct treepath *path, RFALSE(ih_entry_count(le_ih) != 2, "PAP-5220: incorrect empty directory item (%h)", le_ih); *cut_size = -(IH_SIZE + ih_item_len(le_ih)); - return M_DELETE; /* Delete the directory item containing "." and ".." entry. */ + /* Delete the directory item containing "." and ".." entry. */ + return M_DELETE; } if (ih_entry_count(le_ih) == 1) { - /* Delete the directory item such as there is one record only - in this item */ + /* + * Delete the directory item such as there is one record only + * in this item + */ *cut_size = -(IH_SIZE + ih_item_len(le_ih)); return M_DELETE; } @@ -976,14 +1003,30 @@ static inline int prepare_for_direntry_item(struct treepath *path, #define JOURNAL_FOR_FREE_BLOCK_AND_UPDATE_SD (2 * JOURNAL_PER_BALANCE_CNT + 1) -/* If the path points to a directory or direct item, calculate mode and the size cut, for balance. - If the path points to an indirect item, remove some number of its unformatted nodes. - In case of file truncate calculate whether this item must be deleted/truncated or last - unformatted node of this item will be converted to a direct item. - This function returns a determination of what balance mode the calling function should employ. */ -static char prepare_for_delete_or_cut(struct reiserfs_transaction_handle *th, struct inode *inode, struct treepath *path, const struct cpu_key *item_key, int *removed, /* Number of unformatted nodes which were removed - from end of the file. */ - int *cut_size, unsigned long long new_file_length /* MAX_KEY_OFFSET in case of delete. */ +/* + * If the path points to a directory or direct item, calculate mode + * and the size cut, for balance. + * If the path points to an indirect item, remove some number of its + * unformatted nodes. + * In case of file truncate calculate whether this item must be + * deleted/truncated or last unformatted node of this item will be + * converted to a direct item. + * This function returns a determination of what balance mode the + * calling function should employ. + */ +static char prepare_for_delete_or_cut(struct reiserfs_transaction_handle *th, + struct inode *inode, + struct treepath *path, + const struct cpu_key *item_key, + /* + * Number of unformatted nodes + * which were removed from end + * of the file. + */ + int *removed, + int *cut_size, + /* MAX_KEY_OFFSET in case of delete. */ + unsigned long long new_file_length ) { struct super_block *sb = inode->i_sb; @@ -1023,8 +1066,10 @@ static char prepare_for_delete_or_cut(struct reiserfs_transaction_handle *th, st int pos = 0; if ( new_file_length == max_reiserfs_offset (inode) ) { - /* prepare_for_delete_or_cut() is called by - * reiserfs_delete_item() */ + /* + * prepare_for_delete_or_cut() is called by + * reiserfs_delete_item() + */ new_file_length = 0; delete = 1; } @@ -1040,9 +1085,12 @@ static char prepare_for_delete_or_cut(struct reiserfs_transaction_handle *th, st __le32 *unfm; __u32 block; - /* Each unformatted block deletion may involve one additional - * bitmap block into the transaction, thereby the initial - * journal space reservation might not be enough. */ + /* + * Each unformatted block deletion may involve + * one additional bitmap block into the transaction, + * thereby the initial journal space reservation + * might not be enough. + */ if (!delete && (*cut_size) != 0 && reiserfs_transaction_free_space(th) < JOURNAL_FOR_FREE_BLOCK_AND_UPDATE_SD) break; @@ -1074,17 +1122,21 @@ static char prepare_for_delete_or_cut(struct reiserfs_transaction_handle *th, st break; } } - /* a trick. If the buffer has been logged, this will do nothing. If - ** we've broken the loop without logging it, it will restore the - ** buffer */ + /* + * a trick. If the buffer has been logged, this will + * do nothing. If we've broken the loop without logging + * it, it will restore the buffer + */ reiserfs_restore_prepared_buffer(sb, bh); } while (need_re_search && search_for_position_by_key(sb, item_key, path) == POSITION_FOUND); pos_in_item(path) = pos * UNFM_P_SIZE; if (*cut_size == 0) { - /* Nothing were cut. maybe convert last unformatted node to the - * direct item? */ + /* + * Nothing was cut. maybe convert last unformatted node to the + * direct item? + */ result = M_CONVERT; } return result; @@ -1104,9 +1156,11 @@ static int calc_deleted_bytes_number(struct tree_balance *tb, char mode) (mode == M_DELETE) ? ih_item_len(p_le_ih) : -tb->insert_size[0]; if (is_direntry_le_ih(p_le_ih)) { - /* return EMPTY_DIR_SIZE; We delete emty directoris only. - * we can't use EMPTY_DIR_SIZE, as old format dirs have a different - * empty size. ick. FIXME, is this right? */ + /* + * return EMPTY_DIR_SIZE; We delete emty directories only. + * we can't use EMPTY_DIR_SIZE, as old format dirs have a + * different empty size. ick. FIXME, is this right? + */ return del_size; } @@ -1169,7 +1223,8 @@ char head2type(struct item_head *ih) } #endif -/* Delete object item. +/* + * Delete object item. * th - active transaction handle * path - path to the deleted item * item_key - key to search for the deleted item @@ -1221,7 +1276,7 @@ int reiserfs_delete_item(struct reiserfs_transaction_handle *th, PROC_INFO_INC(sb, delete_item_restarted); - // file system changed, repeat search + /* file system changed, repeat search */ ret_value = search_for_position_by_key(sb, item_key, path); if (ret_value == IO_ERROR) @@ -1238,16 +1293,18 @@ int reiserfs_delete_item(struct reiserfs_transaction_handle *th, unfix_nodes(&s_del_balance); return 0; } - // reiserfs_delete_item returns item length when success + + /* reiserfs_delete_item returns item length when success */ ret_value = calc_deleted_bytes_number(&s_del_balance, M_DELETE); q_ih = tp_item_head(path); quota_cut_bytes = ih_item_len(q_ih); - /* hack so the quota code doesn't have to guess if the file - ** has a tail. On tail insert, we allocate quota for 1 unformatted node. - ** We test the offset because the tail might have been - ** split into multiple items, and we only want to decrement for - ** the unfm node once + /* + * hack so the quota code doesn't have to guess if the file has a + * tail. On tail insert, we allocate quota for 1 unformatted node. + * We test the offset because the tail might have been + * split into multiple items, and we only want to decrement for + * the unfm node once */ if (!S_ISLNK(inode->i_mode) && is_direct_le_ih(q_ih)) { if ((le_ih_k_offset(q_ih) & (sb->s_blocksize - 1)) == 1) { @@ -1261,24 +1318,28 @@ int reiserfs_delete_item(struct reiserfs_transaction_handle *th, int off; char *data; - /* We are in direct2indirect conversion, so move tail contents - to the unformatted node */ - /* note, we do the copy before preparing the buffer because we - ** don't care about the contents of the unformatted node yet. - ** the only thing we really care about is the direct item's data - ** is in the unformatted node. - ** - ** Otherwise, we would have to call reiserfs_prepare_for_journal on - ** the unformatted node, which might schedule, meaning we'd have to - ** loop all the way back up to the start of the while loop. - ** - ** The unformatted node must be dirtied later on. We can't be - ** sure here if the entire tail has been deleted yet. - ** - ** un_bh is from the page cache (all unformatted nodes are - ** from the page cache) and might be a highmem page. So, we - ** can't use un_bh->b_data. - ** -clm + /* + * We are in direct2indirect conversion, so move tail contents + * to the unformatted node + */ + /* + * note, we do the copy before preparing the buffer because we + * don't care about the contents of the unformatted node yet. + * the only thing we really care about is the direct item's + * data is in the unformatted node. + * + * Otherwise, we would have to call + * reiserfs_prepare_for_journal on the unformatted node, + * which might schedule, meaning we'd have to loop all the + * way back up to the start of the while loop. + * + * The unformatted node must be dirtied later on. We can't be + * sure here if the entire tail has been deleted yet. + * + * un_bh is from the page cache (all unformatted nodes are + * from the page cache) and might be a highmem page. So, we + * can't use un_bh->b_data. + * -clm */ data = kmap_atomic(un_bh->b_page); @@ -1288,6 +1349,7 @@ int reiserfs_delete_item(struct reiserfs_transaction_handle *th, ret_value); kunmap_atomic(data); } + /* Perform balancing after all resources have been collected at once. */ do_balance(&s_del_balance, NULL, NULL, M_DELETE); @@ -1304,20 +1366,21 @@ int reiserfs_delete_item(struct reiserfs_transaction_handle *th, return ret_value; } -/* Summary Of Mechanisms For Handling Collisions Between Processes: - - deletion of the body of the object is performed by iput(), with the - result that if multiple processes are operating on a file, the - deletion of the body of the file is deferred until the last process - that has an open inode performs its iput(). - - writes and truncates are protected from collisions by use of - semaphores. - - creates, linking, and mknod are protected from collisions with other - processes by making the reiserfs_add_entry() the last step in the - creation, and then rolling back all changes if there was a collision. - - Hans +/* + * Summary Of Mechanisms For Handling Collisions Between Processes: + * + * deletion of the body of the object is performed by iput(), with the + * result that if multiple processes are operating on a file, the + * deletion of the body of the file is deferred until the last process + * that has an open inode performs its iput(). + * + * writes and truncates are protected from collisions by use of + * semaphores. + * + * creates, linking, and mknod are protected from collisions with other + * processes by making the reiserfs_add_entry() the last step in the + * creation, and then rolling back all changes if there was a collision. + * - Hans */ /* this deletes item which never gets split */ @@ -1347,7 +1410,11 @@ void reiserfs_delete_solid_item(struct reiserfs_transaction_handle *th, } if (retval != ITEM_FOUND) { pathrelse(&path); - // No need for a warning, if there is just no free space to insert '..' item into the newly-created subdir + /* + * No need for a warning, if there is just no free + * space to insert '..' item into the + * newly-created subdir + */ if (! ((unsigned long long) GET_HASH_VALUE(le_key_k_offset @@ -1376,7 +1443,11 @@ void reiserfs_delete_solid_item(struct reiserfs_transaction_handle *th, if (retval == CARRY_ON) { do_balance(&tb, NULL, NULL, M_DELETE); - if (inode) { /* Should we count quota for item? (we don't count quotas for save-links) */ + /* + * Should we count quota for item? (we don't + * count quotas for save-links) + */ + if (inode) { int depth; #ifdef REISERQUOTA_DEBUG reiserfs_debug(th->t_super, REISERFS_DEBUG_CODE, @@ -1391,7 +1462,8 @@ void reiserfs_delete_solid_item(struct reiserfs_transaction_handle *th, } break; } - // IO_ERROR, NO_DISK_SPACE, etc + + /* IO_ERROR, NO_DISK_SPACE, etc */ reiserfs_warning(th->t_super, "vs-5360", "could not delete %K due to fix_nodes failure", &cpu_key); @@ -1447,11 +1519,13 @@ static void unmap_buffers(struct page *page, loff_t pos) do { next = bh->b_this_page; - /* we want to unmap the buffers that contain the tail, and - ** all the buffers after it (since the tail must be at the - ** end of the file). We don't want to unmap file data - ** before the tail, since it might be dirty and waiting to - ** reach disk + /* + * we want to unmap the buffers that contain + * the tail, and all the buffers after it + * (since the tail must be at the end of the + * file). We don't want to unmap file data + * before the tail, since it might be dirty + * and waiting to reach disk */ cur_index += bh->b_size; if (cur_index > tail_index) { @@ -1476,9 +1550,10 @@ static int maybe_indirect_to_direct(struct reiserfs_transaction_handle *th, BUG_ON(!th->t_trans_id); BUG_ON(new_file_size != inode->i_size); - /* the page being sent in could be NULL if there was an i/o error - ** reading in the last block. The user will hit problems trying to - ** read the file, but for now we just skip the indirect2direct + /* + * the page being sent in could be NULL if there was an i/o error + * reading in the last block. The user will hit problems trying to + * read the file, but for now we just skip the indirect2direct */ if (atomic_read(&inode->i_count) > 1 || !tail_has_to_be_packed(inode) || @@ -1490,17 +1565,18 @@ static int maybe_indirect_to_direct(struct reiserfs_transaction_handle *th, pathrelse(path); return cut_bytes; } + /* Perform the conversion to a direct_item. */ - /* return indirect_to_direct(inode, path, item_key, - new_file_size, mode); */ return indirect2direct(th, inode, page, path, item_key, new_file_size, mode); } -/* we did indirect_to_direct conversion. And we have inserted direct - item successesfully, but there were no disk space to cut unfm - pointer being converted. Therefore we have to delete inserted - direct item(s) */ +/* + * we did indirect_to_direct conversion. And we have inserted direct + * item successesfully, but there were no disk space to cut unfm + * pointer being converted. Therefore we have to delete inserted + * direct item(s) + */ static void indirect_to_direct_roll_back(struct reiserfs_transaction_handle *th, struct inode *inode, struct treepath *path) { @@ -1509,7 +1585,7 @@ static void indirect_to_direct_roll_back(struct reiserfs_transaction_handle *th, int removed; BUG_ON(!th->t_trans_id); - make_cpu_key(&tail_key, inode, inode->i_size + 1, TYPE_DIRECT, 4); // !!!! + make_cpu_key(&tail_key, inode, inode->i_size + 1, TYPE_DIRECT, 4); tail_key.key_length = 4; tail_len = @@ -1539,7 +1615,6 @@ static void indirect_to_direct_roll_back(struct reiserfs_transaction_handle *th, reiserfs_warning(inode->i_sb, "reiserfs-5091", "indirect_to_direct " "conversion has been rolled back due to " "lack of disk space"); - //mark_file_without_tail (inode); mark_inode_dirty(inode); } @@ -1551,15 +1626,18 @@ int reiserfs_cut_from_item(struct reiserfs_transaction_handle *th, struct page *page, loff_t new_file_size) { struct super_block *sb = inode->i_sb; - /* Every function which is going to call do_balance must first - create a tree_balance structure. Then it must fill up this - structure by using the init_tb_struct and fix_nodes functions. - After that we can make tree balancing. */ + /* + * Every function which is going to call do_balance must first + * create a tree_balance structure. Then it must fill up this + * structure by using the init_tb_struct and fix_nodes functions. + * After that we can make tree balancing. + */ struct tree_balance s_cut_balance; struct item_head *p_le_ih; - int cut_size = 0, /* Amount to be cut. */ - ret_value = CARRY_ON, removed = 0, /* Number of the removed unformatted nodes. */ - is_inode_locked = 0; + int cut_size = 0; /* Amount to be cut. */ + int ret_value = CARRY_ON; + int removed = 0; /* Number of the removed unformatted nodes. */ + int is_inode_locked = 0; char mode; /* Mode of the balance. */ int retval2 = -1; int quota_cut_bytes; @@ -1571,21 +1649,27 @@ int reiserfs_cut_from_item(struct reiserfs_transaction_handle *th, init_tb_struct(th, &s_cut_balance, inode->i_sb, path, cut_size); - /* Repeat this loop until we either cut the item without needing - to balance, or we fix_nodes without schedule occurring */ + /* + * Repeat this loop until we either cut the item without needing + * to balance, or we fix_nodes without schedule occurring + */ while (1) { - /* Determine the balance mode, position of the first byte to - be cut, and size to be cut. In case of the indirect item - free unformatted nodes which are pointed to by the cut - pointers. */ + /* + * Determine the balance mode, position of the first byte to + * be cut, and size to be cut. In case of the indirect item + * free unformatted nodes which are pointed to by the cut + * pointers. + */ mode = prepare_for_delete_or_cut(th, inode, path, item_key, &removed, &cut_size, new_file_size); if (mode == M_CONVERT) { - /* convert last unformatted node to direct item or leave - tail in the unformatted node */ + /* + * convert last unformatted node to direct item or + * leave tail in the unformatted node + */ RFALSE(ret_value != CARRY_ON, "PAP-5570: can not convert twice"); @@ -1599,15 +1683,20 @@ int reiserfs_cut_from_item(struct reiserfs_transaction_handle *th, is_inode_locked = 1; - /* removing of last unformatted node will change value we - have to return to truncate. Save it */ + /* + * removing of last unformatted node will + * change value we have to return to truncate. + * Save it + */ retval2 = ret_value; - /*retval2 = sb->s_blocksize - (new_file_size & (sb->s_blocksize - 1)); */ - /* So, we have performed the first part of the conversion: - inserting the new direct item. Now we are removing the - last unformatted node pointer. Set key to search for - it. */ + /* + * So, we have performed the first part of the + * conversion: + * inserting the new direct item. Now we are + * removing the last unformatted node pointer. + * Set key to search for it. + */ set_cpu_key_k_type(item_key, TYPE_INDIRECT); item_key->key_length = 4; new_file_size -= @@ -1650,11 +1739,13 @@ int reiserfs_cut_from_item(struct reiserfs_transaction_handle *th, return (ret_value == IO_ERROR) ? -EIO : -ENOENT; } /* while */ - // check fix_nodes results (IO_ERROR or NO_DISK_SPACE) + /* check fix_nodes results (IO_ERROR or NO_DISK_SPACE) */ if (ret_value != CARRY_ON) { if (is_inode_locked) { - // FIXME: this seems to be not needed: we are always able - // to cut item + /* + * FIXME: this seems to be not needed: we are always + * able to cut item + */ indirect_to_direct_roll_back(th, inode, path); } if (ret_value == NO_DISK_SPACE) @@ -1678,15 +1769,16 @@ int reiserfs_cut_from_item(struct reiserfs_transaction_handle *th, else ret_value = retval2; - /* For direct items, we only change the quota when deleting the last - ** item. + /* + * For direct items, we only change the quota when deleting the last + * item. */ p_le_ih = tp_item_head(s_cut_balance.tb_path); if (!S_ISLNK(inode->i_mode) && is_direct_le_ih(p_le_ih)) { if (mode == M_DELETE && (le_ih_k_offset(p_le_ih) & (sb->s_blocksize - 1)) == 1) { - // FIXME: this is to keep 3.5 happy + /* FIXME: this is to keep 3.5 happy */ REISERFS_I(inode)->i_first_direct_byte = U32_MAX; quota_cut_bytes = sb->s_blocksize + UNFM_P_SIZE; } else { @@ -1697,9 +1789,11 @@ int reiserfs_cut_from_item(struct reiserfs_transaction_handle *th, if (is_inode_locked) { struct item_head *le_ih = tp_item_head(s_cut_balance.tb_path); - /* we are going to complete indirect2direct conversion. Make - sure, that we exactly remove last unformatted node pointer - of the item */ + /* + * we are going to complete indirect2direct conversion. Make + * sure, that we exactly remove last unformatted node pointer + * of the item + */ if (!is_indirect_le_ih(le_ih)) reiserfs_panic(sb, "vs-5652", "item must be indirect %h", le_ih); @@ -1717,17 +1811,20 @@ int reiserfs_cut_from_item(struct reiserfs_transaction_handle *th, "(CUT, insert_size==%d)", le_ih, s_cut_balance.insert_size[0]); } - /* it would be useful to make sure, that right neighboring - item is direct item of this file */ + /* + * it would be useful to make sure, that right neighboring + * item is direct item of this file + */ } #endif do_balance(&s_cut_balance, NULL, NULL, mode); if (is_inode_locked) { - /* we've done an indirect->direct conversion. when the data block - ** was freed, it was removed from the list of blocks that must - ** be flushed before the transaction commits, make sure to - ** unmap and invalidate it + /* + * we've done an indirect->direct conversion. when the + * data block was freed, it was removed from the list of + * blocks that must be flushed before the transaction + * commits, make sure to unmap and invalidate it */ unmap_buffers(page, tail_pos); REISERFS_I(inode)->i_flags &= ~i_pack_on_close_mask; @@ -1758,20 +1855,25 @@ static void truncate_directory(struct reiserfs_transaction_handle *th, set_le_key_k_type(KEY_FORMAT_3_5, INODE_PKEY(inode), TYPE_STAT_DATA); } -/* Truncate file to the new size. Note, this must be called with a transaction - already started */ +/* + * Truncate file to the new size. Note, this must be called with a + * transaction already started + */ int reiserfs_do_truncate(struct reiserfs_transaction_handle *th, - struct inode *inode, /* ->i_size contains new size */ + struct inode *inode, /* ->i_size contains new size */ struct page *page, /* up to date for last block */ - int update_timestamps /* when it is called by - file_release to convert - the tail - no timestamps - should be updated */ + /* + * when it is called by file_release to convert + * the tail - no timestamps should be updated + */ + int update_timestamps ) { INITIALIZE_PATH(s_search_path); /* Path to the current object item. */ struct item_head *p_le_ih; /* Pointer to an item header. */ - struct cpu_key s_item_key; /* Key to search for a previous file item. */ + + /* Key to search for a previous file item. */ + struct cpu_key s_item_key; loff_t file_size, /* Old file size. */ new_file_size; /* New file size. */ int deleted; /* Number of deleted or truncated bytes. */ @@ -1784,8 +1886,8 @@ int reiserfs_do_truncate(struct reiserfs_transaction_handle *th, || S_ISLNK(inode->i_mode))) return 0; + /* deletion of directory - no need to update timestamps */ if (S_ISDIR(inode->i_mode)) { - // deletion of directory - no need to update timestamps truncate_directory(th, inode); return 0; } @@ -1793,7 +1895,7 @@ int reiserfs_do_truncate(struct reiserfs_transaction_handle *th, /* Get new file size. */ new_file_size = inode->i_size; - // FIXME: note, that key type is unimportant here + /* FIXME: note, that key type is unimportant here */ make_cpu_key(&s_item_key, inode, max_reiserfs_offset(inode), TYPE_DIRECT, 3); @@ -1827,9 +1929,11 @@ int reiserfs_do_truncate(struct reiserfs_transaction_handle *th, int bytes = op_bytes_number(p_le_ih, inode->i_sb->s_blocksize); - /* this may mismatch with real file size: if last direct item - had no padding zeros and last unformatted node had no free - space, this file would have this file size */ + /* + * this may mismatch with real file size: if last direct item + * had no padding zeros and last unformatted node had no free + * space, this file would have this file size + */ file_size = offset + bytes - 1; } /* @@ -1867,14 +1971,17 @@ int reiserfs_do_truncate(struct reiserfs_transaction_handle *th, set_cpu_key_k_offset(&s_item_key, file_size); - /* While there are bytes to truncate and previous file item is presented in the tree. */ + /* + * While there are bytes to truncate and previous + * file item is presented in the tree. + */ /* - ** This loop could take a really long time, and could log - ** many more blocks than a transaction can hold. So, we do a polite - ** journal end here, and if the transaction needs ending, we make - ** sure the file is consistent before ending the current trans - ** and starting a new one + * This loop could take a really long time, and could log + * many more blocks than a transaction can hold. So, we do + * a polite journal end here, and if the transaction needs + * ending, we make sure the file is consistent before ending + * the current trans and starting a new one */ if (journal_transaction_should_end(th, 0) || reiserfs_transaction_free_space(th) <= JOURNAL_FOR_FREE_BLOCK_AND_UPDATE_SD) { @@ -1906,7 +2013,7 @@ int reiserfs_do_truncate(struct reiserfs_transaction_handle *th, update_and_out: if (update_timestamps) { - // this is truncate, not file closing + /* this is truncate, not file closing */ inode->i_mtime = CURRENT_TIME_SEC; inode->i_ctime = CURRENT_TIME_SEC; } @@ -1918,7 +2025,7 @@ int reiserfs_do_truncate(struct reiserfs_transaction_handle *th, } #ifdef CONFIG_REISERFS_CHECK -// this makes sure, that we __append__, not overwrite or add holes +/* this makes sure, that we __append__, not overwrite or add holes */ static void check_research_for_paste(struct treepath *path, const struct cpu_key *key) { @@ -1952,13 +2059,22 @@ static void check_research_for_paste(struct treepath *path, } #endif /* config reiserfs check */ -/* Paste bytes to the existing item. Returns bytes number pasted into the item. */ -int reiserfs_paste_into_item(struct reiserfs_transaction_handle *th, struct treepath *search_path, /* Path to the pasted item. */ - const struct cpu_key *key, /* Key to search for the needed item. */ - struct inode *inode, /* Inode item belongs to */ - const char *body, /* Pointer to the bytes to paste. */ +/* + * Paste bytes to the existing item. + * Returns bytes number pasted into the item. + */ +int reiserfs_paste_into_item(struct reiserfs_transaction_handle *th, + /* Path to the pasted item. */ + struct treepath *search_path, + /* Key to search for the needed item. */ + const struct cpu_key *key, + /* Inode item belongs to */ + struct inode *inode, + /* Pointer to the bytes to paste. */ + const char *body, + /* Size of pasted bytes. */ int pasted_size) -{ /* Size of pasted bytes. */ +{ struct super_block *sb = inode->i_sb; struct tree_balance s_paste_balance; int retval; @@ -2019,8 +2135,10 @@ int reiserfs_paste_into_item(struct reiserfs_transaction_handle *th, struct tree #endif } - /* Perform balancing after all resources are collected by fix_nodes, and - accessing them will not risk triggering schedule. */ + /* + * Perform balancing after all resources are collected by fix_nodes, + * and accessing them will not risk triggering schedule. + */ if (retval == CARRY_ON) { do_balance(&s_paste_balance, NULL /*ih */ , body, M_PASTE); return 0; @@ -2041,7 +2159,8 @@ int reiserfs_paste_into_item(struct reiserfs_transaction_handle *th, struct tree return retval; } -/* Insert new item into the buffer at the path. +/* + * Insert new item into the buffer at the path. * th - active transaction handle * path - path to the inserted item * ih - pointer to the item header to insert @@ -2064,8 +2183,10 @@ int reiserfs_insert_item(struct reiserfs_transaction_handle *th, fs_gen = get_generation(inode->i_sb); quota_bytes = ih_item_len(ih); - /* hack so the quota code doesn't have to guess if the file has - ** a tail, links are always tails, so there's no guessing needed + /* + * hack so the quota code doesn't have to guess + * if the file has a tail, links are always tails, + * so there's no guessing needed */ if (!S_ISLNK(inode->i_mode) && is_direct_le_ih(ih)) quota_bytes = inode->i_sb->s_blocksize + UNFM_P_SIZE; @@ -2074,8 +2195,10 @@ int reiserfs_insert_item(struct reiserfs_transaction_handle *th, "reiserquota insert_item(): allocating %u id=%u type=%c", quota_bytes, inode->i_uid, head2type(ih)); #endif - /* We can't dirty inode here. It would be immediately written but - * appropriate stat item isn't inserted yet... */ + /* + * We can't dirty inode here. It would be immediately + * written but appropriate stat item isn't inserted yet... + */ depth = reiserfs_write_unlock_nested(inode->i_sb); retval = dquot_alloc_space_nodirty(inode, quota_bytes); reiserfs_write_lock_nested(inode->i_sb, depth); @@ -2089,7 +2212,10 @@ int reiserfs_insert_item(struct reiserfs_transaction_handle *th, #ifdef DISPLACE_NEW_PACKING_LOCALITIES s_ins_balance.key = key->on_disk_key; #endif - /* DQUOT_* can schedule, must check to be sure calling fix_nodes is safe */ + /* + * DQUOT_* can schedule, must check to be sure calling + * fix_nodes is safe + */ if (inode && fs_changed(fs_gen, inode->i_sb)) { goto search_again; } diff --git a/fs/reiserfs/super.c b/fs/reiserfs/super.c index c02b6b07508d..6268bb8195c5 100644 --- a/fs/reiserfs/super.c +++ b/fs/reiserfs/super.c @@ -153,13 +153,15 @@ static int reiserfs_unfreeze(struct super_block *s) extern const struct in_core_key MAX_IN_CORE_KEY; -/* this is used to delete "save link" when there are no items of a - file it points to. It can either happen if unlink is completed but - "save unlink" removal, or if file has both unlink and truncate - pending and as unlink completes first (because key of "save link" - protecting unlink is bigger that a key lf "save link" which - protects truncate), so there left no items to make truncate - completion on */ +/* + * this is used to delete "save link" when there are no items of a + * file it points to. It can either happen if unlink is completed but + * "save unlink" removal, or if file has both unlink and truncate + * pending and as unlink completes first (because key of "save link" + * protecting unlink is bigger that a key lf "save link" which + * protects truncate), so there left no items to make truncate + * completion on + */ static int remove_save_link_only(struct super_block *s, struct reiserfs_key *key, int oid_free) { @@ -282,8 +284,10 @@ static int finish_unfinished(struct super_block *s) inode = reiserfs_iget(s, &obj_key); if (!inode) { - /* the unlink almost completed, it just did not manage to remove - "save" link and release objectid */ + /* + * the unlink almost completed, it just did not + * manage to remove "save" link and release objectid + */ reiserfs_warning(s, "vs-2180", "iget failed for %K", &obj_key); retval = remove_save_link_only(s, &save_link_key, 1); @@ -303,10 +307,13 @@ static int finish_unfinished(struct super_block *s) reiserfs_write_lock_nested(inode->i_sb, depth); if (truncate && S_ISDIR(inode->i_mode)) { - /* We got a truncate request for a dir which is impossible. - The only imaginable way is to execute unfinished truncate request - then boot into old kernel, remove the file and create dir with - the same key. */ + /* + * We got a truncate request for a dir which + * is impossible. The only imaginable way is to + * execute unfinished truncate request then boot + * into old kernel, remove the file and create dir + * with the same key. + */ reiserfs_warning(s, "green-2101", "impossible truncate on a " "directory %k. Please report", @@ -320,14 +327,16 @@ static int finish_unfinished(struct super_block *s) if (truncate) { REISERFS_I(inode)->i_flags |= i_link_saved_truncate_mask; - /* not completed truncate found. New size was committed together - with "save" link */ + /* + * not completed truncate found. New size was + * committed together with "save" link + */ reiserfs_info(s, "Truncating %k to %Ld ..", INODE_PKEY(inode), inode->i_size); - reiserfs_truncate_file(inode, - 0 - /*don't update modification time */ - ); + + /* don't update modification time */ + reiserfs_truncate_file(inode, 0); + retval = remove_save_link(inode, truncate); } else { REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask; @@ -373,10 +382,12 @@ static int finish_unfinished(struct super_block *s) return retval; } -/* to protect file being unlinked from getting lost we "safe" link files - being unlinked. This link will be deleted in the same transaction with last - item of file. mounting the filesystem we scan all these links and remove - files which almost got lost */ +/* + * to protect file being unlinked from getting lost we "safe" link files + * being unlinked. This link will be deleted in the same transaction with last + * item of file. mounting the filesystem we scan all these links and remove + * files which almost got lost + */ void add_save_link(struct reiserfs_transaction_handle *th, struct inode *inode, int truncate) { @@ -530,7 +541,10 @@ static void reiserfs_put_super(struct super_block *s) reiserfs_write_lock(s); - /* change file system state to current state if it was mounted with read-write permissions */ + /* + * change file system state to current state if it was mounted + * with read-write permissions + */ if (!(s->s_flags & MS_RDONLY)) { if (!journal_begin(&th, s, 10)) { reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), @@ -541,8 +555,9 @@ static void reiserfs_put_super(struct super_block *s) } } - /* note, journal_release checks for readonly mount, and can decide not - ** to do a journal_end + /* + * note, journal_release checks for readonly mount, and can + * decide not to do a journal_end */ journal_release(&th, s); @@ -635,8 +650,9 @@ static void reiserfs_dirty_inode(struct inode *inode, int flags) } reiserfs_write_lock(inode->i_sb); - /* this is really only used for atime updates, so they don't have - ** to be included in O_SYNC or fsync + /* + * this is really only used for atime updates, so they don't have + * to be included in O_SYNC or fsync */ err = journal_begin(&th, inode->i_sb, 1); if (err) @@ -789,31 +805,53 @@ static const struct export_operations reiserfs_export_ops = { .get_parent = reiserfs_get_parent, }; -/* this struct is used in reiserfs_getopt () for containing the value for those - mount options that have values rather than being toggles. */ +/* + * this struct is used in reiserfs_getopt () for containing the value for + * those mount options that have values rather than being toggles. + */ typedef struct { char *value; - int setmask; /* bitmask which is to set on mount_options bitmask when this - value is found, 0 is no bits are to be changed. */ - int clrmask; /* bitmask which is to clear on mount_options bitmask when this - value is found, 0 is no bits are to be changed. This is - applied BEFORE setmask */ + /* + * bitmask which is to set on mount_options bitmask + * when this value is found, 0 is no bits are to be changed. + */ + int setmask; + /* + * bitmask which is to clear on mount_options bitmask + * when this value is found, 0 is no bits are to be changed. + * This is applied BEFORE setmask + */ + int clrmask; } arg_desc_t; /* Set this bit in arg_required to allow empty arguments */ #define REISERFS_OPT_ALLOWEMPTY 31 -/* this struct is used in reiserfs_getopt() for describing the set of reiserfs - mount options */ +/* + * this struct is used in reiserfs_getopt() for describing the + * set of reiserfs mount options + */ typedef struct { char *option_name; - int arg_required; /* 0 if argument is not required, not 0 otherwise */ - const arg_desc_t *values; /* list of values accepted by an option */ - int setmask; /* bitmask which is to set on mount_options bitmask when this - value is found, 0 is no bits are to be changed. */ - int clrmask; /* bitmask which is to clear on mount_options bitmask when this - value is found, 0 is no bits are to be changed. This is - applied BEFORE setmask */ + + /* 0 if argument is not required, not 0 otherwise */ + int arg_required; + + /* list of values accepted by an option */ + const arg_desc_t *values; + + /* + * bitmask which is to set on mount_options bitmask + * when this value is found, 0 is no bits are to be changed. + */ + int setmask; + + /* + * bitmask which is to clear on mount_options bitmask + * when this value is found, 0 is no bits are to be changed. + * This is applied BEFORE setmask + */ + int clrmask; } opt_desc_t; /* possible values for -o data= */ @@ -834,8 +872,10 @@ static const arg_desc_t barrier_mode[] = { {.value = NULL} }; -/* possible values for "-o block-allocator=" and bits which are to be set in - s_mount_opt of reiserfs specific part of in-core super block */ +/* + * possible values for "-o block-allocator=" and bits which are to be set in + * s_mount_opt of reiserfs specific part of in-core super block + */ static const arg_desc_t balloc[] = { {"noborder", 1 << REISERFS_NO_BORDER, 0}, {"border", 0, 1 << REISERFS_NO_BORDER}, @@ -865,21 +905,25 @@ static const arg_desc_t error_actions[] = { {NULL, 0, 0}, }; -/* proceed only one option from a list *cur - string containing of mount options - opts - array of options which are accepted - opt_arg - if option is found and requires an argument and if it is specifed - in the input - pointer to the argument is stored here - bit_flags - if option requires to set a certain bit - it is set here - return -1 if unknown option is found, opt->arg_required otherwise */ +/* + * proceed only one option from a list *cur - string containing of mount + * options + * opts - array of options which are accepted + * opt_arg - if option is found and requires an argument and if it is specifed + * in the input - pointer to the argument is stored here + * bit_flags - if option requires to set a certain bit - it is set here + * return -1 if unknown option is found, opt->arg_required otherwise + */ static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts, char **opt_arg, unsigned long *bit_flags) { char *p; - /* foo=bar, - ^ ^ ^ - | | +-- option_end - | +-- arg_start - +-- option_start + /* + * foo=bar, + * ^ ^ ^ + * | | +-- option_end + * | +-- arg_start + * +-- option_start */ const opt_desc_t *opt; const arg_desc_t *arg; @@ -894,9 +938,12 @@ static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts, } if (!strncmp(p, "alloc=", 6)) { - /* Ugly special case, probably we should redo options parser so that - it can understand several arguments for some options, also so that - it can fill several bitfields with option values. */ + /* + * Ugly special case, probably we should redo options + * parser so that it can understand several arguments for + * some options, also so that it can fill several bitfields + * with option values. + */ if (reiserfs_parse_alloc_options(s, p + 6)) { return -1; } else { @@ -959,7 +1006,10 @@ static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts, return -1; } - /* move to the argument, or to next option if argument is not required */ + /* + * move to the argument, or to next option if argument is not + * required + */ p++; if (opt->arg_required @@ -996,12 +1046,20 @@ static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts, } /* returns 0 if something is wrong in option string, 1 - otherwise */ -static int reiserfs_parse_options(struct super_block *s, char *options, /* string given via mount's -o */ +static int reiserfs_parse_options(struct super_block *s, + + /* string given via mount's -o */ + char *options, + + /* + * after the parsing phase, contains the + * collection of bitflags defining what + * mount options were selected. + */ unsigned long *mount_options, - /* after the parsing phase, contains the - collection of bitflags defining what - mount options were selected. */ - unsigned long *blocks, /* strtol-ed from NNN of resize=NNN */ + + /* strtol-ed from NNN of resize=NNN */ + unsigned long *blocks, char **jdev_name, unsigned int *commit_max_age, char **qf_names, @@ -1011,7 +1069,10 @@ static int reiserfs_parse_options(struct super_block *s, char *options, /* strin char *arg = NULL; char *pos; opt_desc_t opts[] = { - /* Compatibility stuff, so that -o notail for old setups still work */ + /* + * Compatibility stuff, so that -o notail for old + * setups still work + */ {"tails",.arg_required = 't',.values = tails}, {"notail",.clrmask = (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)}, @@ -1056,8 +1117,10 @@ static int reiserfs_parse_options(struct super_block *s, char *options, /* strin *blocks = 0; if (!options || !*options) - /* use default configuration: create tails, journaling on, no - conversion to newest format */ + /* + * use default configuration: create tails, journaling on, no + * conversion to newest format + */ return 1; for (pos = options; pos;) { @@ -1110,7 +1173,8 @@ static int reiserfs_parse_options(struct super_block *s, char *options, /* strin if (c == 'j') { if (arg && *arg && jdev_name) { - if (*jdev_name) { //Hm, already assigned? + /* Hm, already assigned? */ + if (*jdev_name) { reiserfs_warning(s, "super-6510", "journal device was " "already specified to " @@ -1363,8 +1427,10 @@ static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg) safe_mask |= 1 << REISERFS_USRQUOTA; safe_mask |= 1 << REISERFS_GRPQUOTA; - /* Update the bitmask, taking care to keep - * the bits we're not allowed to change here */ + /* + * Update the bitmask, taking care to keep + * the bits we're not allowed to change here + */ REISERFS_SB(s)->s_mount_opt = (REISERFS_SB(s)-> s_mount_opt & ~safe_mask) | (mount_options & safe_mask); @@ -1428,7 +1494,9 @@ static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg) handle_data_mode(s, mount_options); handle_barrier_mode(s, mount_options); REISERFS_SB(s)->s_mount_state = sb_umount_state(rs); - s->s_flags &= ~MS_RDONLY; /* now it is safe to call journal_begin */ + + /* now it is safe to call journal_begin */ + s->s_flags &= ~MS_RDONLY; err = journal_begin(&th, s, 10); if (err) goto out_err_unlock; @@ -1490,9 +1558,9 @@ static int read_super_block(struct super_block *s, int offset) brelse(bh); return 1; } - // - // ok, reiserfs signature (old or new) found in at the given offset - // + /* + * ok, reiserfs signature (old or new) found in at the given offset + */ fs_blocksize = sb_blocksize(rs); brelse(bh); sb_set_blocksize(s, fs_blocksize); @@ -1530,9 +1598,11 @@ static int read_super_block(struct super_block *s, int offset) SB_BUFFER_WITH_SB(s) = bh; SB_DISK_SUPER_BLOCK(s) = rs; + /* + * magic is of non-standard journal filesystem, look at s_version to + * find which format is in use + */ if (is_reiserfs_jr(rs)) { - /* magic is of non-standard journal filesystem, look at s_version to - find which format is in use */ if (sb_version(rs) == REISERFS_VERSION_2) reiserfs_info(s, "found reiserfs format \"3.6\"" " with non-standard journal\n"); @@ -1546,8 +1616,10 @@ static int read_super_block(struct super_block *s, int offset) return 1; } } else - /* s_version of standard format may contain incorrect information, - so we just look at the magic string */ + /* + * s_version of standard format may contain incorrect + * information, so we just look at the magic string + */ reiserfs_info(s, "found reiserfs format \"%s\" with standard journal\n", is_reiserfs_3_5(rs) ? "3.5" : "3.6"); @@ -1559,8 +1631,9 @@ static int read_super_block(struct super_block *s, int offset) s->dq_op = &reiserfs_quota_operations; #endif - /* new format is limited by the 32 bit wide i_blocks field, want to - ** be one full block below that. + /* + * new format is limited by the 32 bit wide i_blocks field, want to + * be one full block below that. */ s->s_maxbytes = (512LL << 32) - s->s_blocksize; return 0; @@ -1579,14 +1652,15 @@ static int reread_meta_blocks(struct super_block *s) return 0; } -///////////////////////////////////////////////////// -// hash detection stuff +/* hash detection stuff */ -// if root directory is empty - we set default - Yura's - hash and -// warn about it -// FIXME: we look for only one name in a directory. If tea and yura -// bith have the same value - we ask user to send report to the -// mailing list +/* + * if root directory is empty - we set default - Yura's - hash and + * warn about it + * FIXME: we look for only one name in a directory. If tea and yura + * both have the same value - we ask user to send report to the + * mailing list + */ static __u32 find_hash_out(struct super_block *s) { int retval; @@ -1598,7 +1672,7 @@ static __u32 find_hash_out(struct super_block *s) inode = s->s_root->d_inode; - do { // Some serious "goto"-hater was there ;) + do { /* Some serious "goto"-hater was there ;) */ u32 teahash, r5hash, yurahash; make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3); @@ -1663,23 +1737,25 @@ static __u32 find_hash_out(struct super_block *s) return hash; } -// finds out which hash names are sorted with +/* finds out which hash names are sorted with */ static int what_hash(struct super_block *s) { __u32 code; code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s)); - /* reiserfs_hash_detect() == true if any of the hash mount options - ** were used. We must check them to make sure the user isn't - ** using a bad hash value + /* + * reiserfs_hash_detect() == true if any of the hash mount options + * were used. We must check them to make sure the user isn't + * using a bad hash value */ if (code == UNSET_HASH || reiserfs_hash_detect(s)) code = find_hash_out(s); if (code != UNSET_HASH && reiserfs_hash_detect(s)) { - /* detection has found the hash, and we must check against the - ** mount options + /* + * detection has found the hash, and we must check against the + * mount options */ if (reiserfs_rupasov_hash(s) && code != YURA_HASH) { reiserfs_warning(s, "reiserfs-2507", @@ -1701,7 +1777,10 @@ static int what_hash(struct super_block *s) code = UNSET_HASH; } } else { - /* find_hash_out was not called or could not determine the hash */ + /* + * find_hash_out was not called or + * could not determine the hash + */ if (reiserfs_rupasov_hash(s)) { code = YURA_HASH; } else if (reiserfs_tea_hash(s)) { @@ -1711,8 +1790,9 @@ static int what_hash(struct super_block *s) } } - /* if we are mounted RW, and we have a new valid hash code, update - ** the super + /* + * if we are mounted RW, and we have a new valid hash code, update + * the super */ if (code != UNSET_HASH && !(s->s_flags & MS_RDONLY) && @@ -1722,7 +1802,7 @@ static int what_hash(struct super_block *s) return code; } -// return pointer to appropriate function +/* return pointer to appropriate function */ static hashf_t hash_function(struct super_block *s) { switch (what_hash(s)) { @@ -1739,7 +1819,7 @@ static hashf_t hash_function(struct super_block *s) return NULL; } -// this is used to set up correct value for old partitions +/* this is used to set up correct value for old partitions */ static int function2code(hashf_t func) { if (func == keyed_hash) @@ -1749,7 +1829,7 @@ static int function2code(hashf_t func) if (func == r5_hash) return R5_HASH; - BUG(); // should never happen + BUG(); /* should never happen */ return 0; } @@ -1784,8 +1864,7 @@ static int reiserfs_fill_super(struct super_block *s, void *data, int silent) sbi->s_mount_opt |= (1 << REISERFS_SMALLTAIL); sbi->s_mount_opt |= (1 << REISERFS_ERROR_RO); sbi->s_mount_opt |= (1 << REISERFS_BARRIER_FLUSH); - /* no preallocation minimum, be smart in - reiserfs_file_write instead */ + /* no preallocation minimum, be smart in reiserfs_file_write instead */ sbi->s_alloc_options.preallocmin = 0; /* Preallocate by 16 blocks (17-1) at once */ sbi->s_alloc_options.preallocsize = 17; @@ -1828,10 +1907,17 @@ static int reiserfs_fill_super(struct super_block *s, void *data, int silent) goto error_unlocked; } - /* try old format (undistributed bitmap, super block in 8-th 1k block of a device) */ + /* + * try old format (undistributed bitmap, super block in 8-th 1k + * block of a device) + */ if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES)) old_format = 1; - /* try new format (64-th 1k block), which can contain reiserfs super block */ + + /* + * try new format (64-th 1k block), which can contain reiserfs + * super block + */ else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) { SWARN(silent, s, "sh-2021", "can not find reiserfs on %s", s->s_id); @@ -1839,9 +1925,11 @@ static int reiserfs_fill_super(struct super_block *s, void *data, int silent) } rs = SB_DISK_SUPER_BLOCK(s); - /* Let's do basic sanity check to verify that underlying device is not - smaller than the filesystem. If the check fails then abort and scream, - because bad stuff will happen otherwise. */ + /* + * Let's do basic sanity check to verify that underlying device is not + * smaller than the filesystem. If the check fails then abort and + * scream, because bad stuff will happen otherwise. + */ if (s->s_bdev && s->s_bdev->bd_inode && i_size_read(s->s_bdev->bd_inode) < sb_block_count(rs) * sb_blocksize(rs)) { @@ -1885,15 +1973,16 @@ static int reiserfs_fill_super(struct super_block *s, void *data, int silent) printk("reiserfs: using flush barriers\n"); } - // set_device_ro(s->s_dev, 1) ; if (journal_init(s, jdev_name, old_format, commit_max_age)) { SWARN(silent, s, "sh-2022", "unable to initialize journal space"); goto error_unlocked; } else { - jinit_done = 1; /* once this is set, journal_release must be called - ** if we error out of the mount - */ + /* + * once this is set, journal_release must be called + * if we error out of the mount + */ + jinit_done = 1; } if (reread_meta_blocks(s)) { @@ -1938,7 +2027,7 @@ static int reiserfs_fill_super(struct super_block *s, void *data, int silent) s->s_root = d_make_root(root_inode); if (!s->s_root) goto error; - // define and initialize hash function + /* define and initialize hash function */ sbi->s_hash_function = hash_function(s); if (sbi->s_hash_function == NULL) { dput(s->s_root); @@ -1967,10 +2056,12 @@ static int reiserfs_fill_super(struct super_block *s, void *data, int silent) set_sb_umount_state(rs, REISERFS_ERROR_FS); set_sb_fs_state(rs, 0); - /* Clear out s_bmap_nr if it would wrap. We can handle this + /* + * Clear out s_bmap_nr if it would wrap. We can handle this * case, but older revisions can't. This will cause the * file system to fail mount on those older implementations, - * avoiding corruption. -jeffm */ + * avoiding corruption. -jeffm + */ if (bmap_would_wrap(reiserfs_bmap_count(s)) && sb_bmap_nr(rs) != 0) { reiserfs_warning(s, "super-2030", "This file system " @@ -1983,8 +2074,10 @@ static int reiserfs_fill_super(struct super_block *s, void *data, int silent) } if (old_format_only(s)) { - /* filesystem of format 3.5 either with standard or non-standard - journal */ + /* + * filesystem of format 3.5 either with standard + * or non-standard journal + */ if (convert_reiserfs(s)) { /* and -o conv is given */ if (!silent) @@ -1992,8 +2085,11 @@ static int reiserfs_fill_super(struct super_block *s, void *data, int silent) "converting 3.5 filesystem to the 3.6 format"); if (is_reiserfs_3_5(rs)) - /* put magic string of 3.6 format. 2.2 will not be able to - mount this filesystem anymore */ + /* + * put magic string of 3.6 format. + * 2.2 will not be able to + * mount this filesystem anymore + */ memcpy(rs->s_v1.s_magic, reiserfs_3_6_magic_string, sizeof @@ -2027,7 +2123,9 @@ static int reiserfs_fill_super(struct super_block *s, void *data, int silent) } reiserfs_write_lock(s); - /* look for files which were to be removed in previous session */ + /* + * look for files which were to be removed in previous session + */ finish_unfinished(s); } else { if (old_format_only(s) && !silent) { @@ -2043,7 +2141,9 @@ static int reiserfs_fill_super(struct super_block *s, void *data, int silent) } reiserfs_write_lock(s); } - // mark hash in super block: it could be unset. overwrite should be ok + /* + * mark hash in super block: it could be unset. overwrite should be ok + */ set_sb_hash_function_code(rs, function2code(sbi->s_hash_function)); handle_attrs(s); @@ -2247,7 +2347,10 @@ static int reiserfs_quota_on(struct super_block *sb, int type, int format_id, goto out; } inode = path->dentry->d_inode; - /* We must not pack tails for quota files on reiserfs for quota IO to work */ + /* + * We must not pack tails for quota files on reiserfs for quota + * IO to work + */ if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) { err = reiserfs_unpack(inode, NULL); if (err) { @@ -2288,10 +2391,12 @@ out: return err; } -/* Read data from quotafile - avoid pagecache and such because we cannot afford +/* + * Read data from quotafile - avoid pagecache and such because we cannot afford * acquiring the locks... As quota files are never truncated and quota code * itself serializes the operations (and no one else should touch the files) - * we don't have to be afraid of races */ + * we don't have to be afraid of races + */ static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data, size_t len, loff_t off) { @@ -2312,7 +2417,10 @@ static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data, sb->s_blocksize - offset < toread ? sb->s_blocksize - offset : toread; tmp_bh.b_state = 0; - /* Quota files are without tails so we can safely use this function */ + /* + * Quota files are without tails so we can safely + * use this function + */ reiserfs_write_lock(sb); err = reiserfs_get_block(inode, blk, &tmp_bh, 0); reiserfs_write_unlock(sb); @@ -2335,8 +2443,10 @@ static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data, return len; } -/* Write to quotafile (we know the transaction is already started and has - * enough credits) */ +/* + * Write to quotafile (we know the transaction is already started and has + * enough credits) + */ static ssize_t reiserfs_quota_write(struct super_block *sb, int type, const char *data, size_t len, loff_t off) { diff --git a/fs/reiserfs/tail_conversion.c b/fs/reiserfs/tail_conversion.c index fc1981d858dc..f41e19b4bb42 100644 --- a/fs/reiserfs/tail_conversion.c +++ b/fs/reiserfs/tail_conversion.c @@ -1,5 +1,6 @@ /* - * Copyright 1999 Hans Reiser, see reiserfs/README for licensing and copyright details + * Copyright 1999 Hans Reiser, see reiserfs/README for licensing and copyright + * details */ #include <linux/time.h> @@ -7,13 +8,19 @@ #include <linux/buffer_head.h> #include "reiserfs.h" -/* access to tail : when one is going to read tail it must make sure, that is not running. - direct2indirect and indirect2direct can not run concurrently */ +/* + * access to tail : when one is going to read tail it must make sure, that is + * not running. direct2indirect and indirect2direct can not run concurrently + */ -/* Converts direct items to an unformatted node. Panics if file has no - tail. -ENOSPC if no disk space for conversion */ -/* path points to first direct item of the file regarless of how many of - them are there */ +/* + * Converts direct items to an unformatted node. Panics if file has no + * tail. -ENOSPC if no disk space for conversion + */ +/* + * path points to first direct item of the file regardless of how many of + * them are there + */ int direct2indirect(struct reiserfs_transaction_handle *th, struct inode *inode, struct treepath *path, struct buffer_head *unbh, loff_t tail_offset) @@ -22,14 +29,20 @@ int direct2indirect(struct reiserfs_transaction_handle *th, struct inode *inode, struct buffer_head *up_to_date_bh; struct item_head *p_le_ih = tp_item_head(path); unsigned long total_tail = 0; - struct cpu_key end_key; /* Key to search for the last byte of the - converted item. */ - struct item_head ind_ih; /* new indirect item to be inserted or - key of unfm pointer to be pasted */ - int blk_size, retval; /* returned value for reiserfs_insert_item and clones */ - unp_t unfm_ptr; /* Handle on an unformatted node - that will be inserted in the - tree. */ + + /* Key to search for the last byte of the converted item. */ + struct cpu_key end_key; + + /* + * new indirect item to be inserted or key + * of unfm pointer to be pasted + */ + struct item_head ind_ih; + int blk_size; + /* returned value for reiserfs_insert_item and clones */ + int retval; + /* Handle on an unformatted node that will be inserted in the tree. */ + unp_t unfm_ptr; BUG_ON(!th->t_trans_id); @@ -37,8 +50,10 @@ int direct2indirect(struct reiserfs_transaction_handle *th, struct inode *inode, blk_size = sb->s_blocksize; - /* and key to search for append or insert pointer to the new - unformatted node. */ + /* + * and key to search for append or insert pointer to the new + * unformatted node. + */ copy_item_head(&ind_ih, p_le_ih); set_le_ih_k_offset(&ind_ih, tail_offset); set_le_ih_k_type(&ind_ih, TYPE_INDIRECT); @@ -76,20 +91,26 @@ int direct2indirect(struct reiserfs_transaction_handle *th, struct inode *inode, if (retval) { return retval; } - // note: from here there are two keys which have matching first - // three key components. They only differ by the fourth one. + /* + * note: from here there are two keys which have matching first + * three key components. They only differ by the fourth one. + */ /* Set the key to search for the direct items of the file */ make_cpu_key(&end_key, inode, max_reiserfs_offset(inode), TYPE_DIRECT, 4); - /* Move bytes from the direct items to the new unformatted node - and delete them. */ + /* + * Move bytes from the direct items to the new unformatted node + * and delete them. + */ while (1) { int tail_size; - /* end_key.k_offset is set so, that we will always have found - last item of the file */ + /* + * end_key.k_offset is set so, that we will always have found + * last item of the file + */ if (search_for_position_by_key(sb, &end_key, path) == POSITION_FOUND) reiserfs_panic(sb, "PAP-14050", @@ -101,11 +122,12 @@ int direct2indirect(struct reiserfs_transaction_handle *th, struct inode *inode, tail_size = (le_ih_k_offset(p_le_ih) & (blk_size - 1)) + ih_item_len(p_le_ih) - 1; - /* we only send the unbh pointer if the buffer is not up to date. - ** this avoids overwriting good data from writepage() with old data - ** from the disk or buffer cache - ** Special case: unbh->b_page will be NULL if we are coming through - ** DIRECT_IO handler here. + /* + * we only send the unbh pointer if the buffer is not + * up to date. this avoids overwriting good data from + * writepage() with old data from the disk or buffer cache + * Special case: unbh->b_page will be NULL if we are coming + * through DIRECT_IO handler here. */ if (!unbh->b_page || buffer_uptodate(unbh) || PageUptodate(unbh->b_page)) { @@ -117,13 +139,15 @@ int direct2indirect(struct reiserfs_transaction_handle *th, struct inode *inode, up_to_date_bh); total_tail += retval; + + /* done: file does not have direct items anymore */ if (tail_size == retval) - // done: file does not have direct items anymore break; } - /* if we've copied bytes from disk into the page, we need to zero - ** out the unused part of the block (it was not up to date before) + /* + * if we've copied bytes from disk into the page, we need to zero + * out the unused part of the block (it was not up to date before) */ if (up_to_date_bh) { unsigned pgoff = @@ -146,9 +170,11 @@ void reiserfs_unmap_buffer(struct buffer_head *bh) BUG(); } clear_buffer_dirty(bh); - /* Remove the buffer from whatever list it belongs to. We are mostly - interested in removing it from per-sb j_dirty_buffers list, to avoid - BUG() on attempt to write not mapped buffer */ + /* + * Remove the buffer from whatever list it belongs to. We are mostly + * interested in removing it from per-sb j_dirty_buffers list, to avoid + * BUG() on attempt to write not mapped buffer + */ if ((!list_empty(&bh->b_assoc_buffers) || bh->b_private) && bh->b_page) { struct inode *inode = bh->b_page->mapping->host; struct reiserfs_journal *j = SB_JOURNAL(inode->i_sb); @@ -164,12 +190,14 @@ void reiserfs_unmap_buffer(struct buffer_head *bh) unlock_buffer(bh); } -/* this first locks inode (neither reads nor sync are permitted), - reads tail through page cache, insert direct item. When direct item - inserted successfully inode is left locked. Return value is always - what we expect from it (number of cut bytes). But when tail remains - in the unformatted node, we set mode to SKIP_BALANCING and unlock - inode */ +/* + * this first locks inode (neither reads nor sync are permitted), + * reads tail through page cache, insert direct item. When direct item + * inserted successfully inode is left locked. Return value is always + * what we expect from it (number of cut bytes). But when tail remains + * in the unformatted node, we set mode to SKIP_BALANCING and unlock + * inode + */ int indirect2direct(struct reiserfs_transaction_handle *th, struct inode *inode, struct page *page, struct treepath *path, /* path to the indirect item. */ @@ -207,9 +235,11 @@ int indirect2direct(struct reiserfs_transaction_handle *th, 1) * sb->s_blocksize; pos1 = pos; - // we are protected by i_mutex. The tail can not disapper, not - // append can be done either - // we are in truncate or packing tail in file_release + /* + * we are protected by i_mutex. The tail can not disapper, not + * append can be done either + * we are in truncate or packing tail in file_release + */ tail = (char *)kmap(page); /* this can schedule */ @@ -236,9 +266,10 @@ int indirect2direct(struct reiserfs_transaction_handle *th, pos1 + 1, TYPE_DIRECT, round_tail_len, 0xffff /*ih_free_space */ ); - /* we want a pointer to the first byte of the tail in the page. - ** the page was locked and this part of the page was up to date when - ** indirect2direct was called, so we know the bytes are still valid + /* + * we want a pointer to the first byte of the tail in the page. + * the page was locked and this part of the page was up to date when + * indirect2direct was called, so we know the bytes are still valid */ tail = tail + (pos & (PAGE_CACHE_SIZE - 1)); @@ -250,12 +281,14 @@ int indirect2direct(struct reiserfs_transaction_handle *th, /* Insert tail as new direct item in the tree */ if (reiserfs_insert_item(th, path, &key, &s_ih, inode, tail ? tail : NULL) < 0) { - /* No disk memory. So we can not convert last unformatted node - to the direct item. In this case we used to adjust - indirect items's ih_free_space. Now ih_free_space is not - used, it would be ideal to write zeros to corresponding - unformatted node. For now i_size is considered as guard for - going out of file size */ + /* + * No disk memory. So we can not convert last unformatted node + * to the direct item. In this case we used to adjust + * indirect items's ih_free_space. Now ih_free_space is not + * used, it would be ideal to write zeros to corresponding + * unformatted node. For now i_size is considered as guard for + * going out of file size + */ kunmap(page); return block_size - round_tail_len; } @@ -264,12 +297,16 @@ int indirect2direct(struct reiserfs_transaction_handle *th, /* make sure to get the i_blocks changes from reiserfs_insert_item */ reiserfs_update_sd(th, inode); - // note: we have now the same as in above direct2indirect - // conversion: there are two keys which have matching first three - // key components. They only differ by the fouhth one. + /* + * note: we have now the same as in above direct2indirect + * conversion: there are two keys which have matching first three + * key components. They only differ by the fourth one. + */ - /* We have inserted new direct item and must remove last - unformatted node. */ + /* + * We have inserted new direct item and must remove last + * unformatted node. + */ *mode = M_CUT; /* we store position of first direct item in the in-core inode */ diff --git a/fs/reiserfs/xattr.c b/fs/reiserfs/xattr.c index 5cdfbd638b5c..f669990376af 100644 --- a/fs/reiserfs/xattr.c +++ b/fs/reiserfs/xattr.c @@ -56,9 +56,11 @@ #define XAROOT_NAME "xattrs" -/* Helpers for inode ops. We do this so that we don't have all the VFS +/* + * Helpers for inode ops. We do this so that we don't have all the VFS * overhead and also for proper i_mutex annotation. - * dir->i_mutex must be held for all of them. */ + * dir->i_mutex must be held for all of them. + */ #ifdef CONFIG_REISERFS_FS_XATTR static int xattr_create(struct inode *dir, struct dentry *dentry, int mode) { @@ -73,10 +75,12 @@ static int xattr_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) return dir->i_op->mkdir(dir, dentry, mode); } -/* We use I_MUTEX_CHILD here to silence lockdep. It's safe because xattr +/* + * We use I_MUTEX_CHILD here to silence lockdep. It's safe because xattr * mutation ops aren't called during rename or splace, which are the * only other users of I_MUTEX_CHILD. It violates the ordering, but that's - * better than allocating another subclass just for this code. */ + * better than allocating another subclass just for this code. + */ static int xattr_unlink(struct inode *dir, struct dentry *dentry) { int error; @@ -166,9 +170,11 @@ static struct dentry *open_xa_dir(const struct inode *inode, int flags) return xadir; } -/* The following are side effects of other operations that aren't explicitly +/* + * The following are side effects of other operations that aren't explicitly * modifying extended attributes. This includes operations such as permissions - * or ownership changes, object deletions, etc. */ + * or ownership changes, object deletions, etc. + */ struct reiserfs_dentry_buf { struct dir_context ctx; struct dentry *xadir; @@ -267,11 +273,13 @@ static int reiserfs_for_each_xattr(struct inode *inode, cleanup_dentry_buf(&buf); if (!err) { - /* We start a transaction here to avoid a ABBA situation + /* + * We start a transaction here to avoid a ABBA situation * between the xattr root's i_mutex and the journal lock. * This doesn't incur much additional overhead since the * new transaction will just nest inside the - * outer transaction. */ + * outer transaction. + */ int blocks = JOURNAL_PER_BALANCE_CNT * 2 + 2 + 4 * REISERFS_QUOTA_TRANS_BLOCKS(inode->i_sb); struct reiserfs_transaction_handle th; @@ -349,9 +357,11 @@ int reiserfs_chown_xattrs(struct inode *inode, struct iattr *attrs) } #ifdef CONFIG_REISERFS_FS_XATTR -/* Returns a dentry corresponding to a specific extended attribute file +/* + * Returns a dentry corresponding to a specific extended attribute file * for the inode. If flags allow, the file is created. Otherwise, a - * valid or negative dentry, or an error is returned. */ + * valid or negative dentry, or an error is returned. + */ static struct dentry *xattr_lookup(struct inode *inode, const char *name, int flags) { @@ -400,8 +410,10 @@ static struct page *reiserfs_get_page(struct inode *dir, size_t n) { struct address_space *mapping = dir->i_mapping; struct page *page; - /* We can deadlock if we try to free dentries, - and an unlink/rmdir has just occurred - GFP_NOFS avoids this */ + /* + * We can deadlock if we try to free dentries, + * and an unlink/rmdir has just occurred - GFP_NOFS avoids this + */ mapping_set_gfp_mask(mapping, GFP_NOFS); page = read_mapping_page(mapping, n >> PAGE_CACHE_SHIFT, NULL); if (!IS_ERR(page)) { @@ -615,8 +627,10 @@ reiserfs_xattr_get(struct inode *inode, const char *name, void *buffer, if (name == NULL) return -EINVAL; - /* We can't have xattrs attached to v1 items since they don't have - * generation numbers */ + /* + * We can't have xattrs attached to v1 items since they don't have + * generation numbers + */ if (get_inode_sd_version(inode) == STAT_DATA_V1) return -EOPNOTSUPP; @@ -913,12 +927,16 @@ static const struct xattr_handler *reiserfs_xattr_handlers[] = { static int xattr_mount_check(struct super_block *s) { - /* We need generation numbers to ensure that the oid mapping is correct - * v3.5 filesystems don't have them. */ + /* + * We need generation numbers to ensure that the oid mapping is correct + * v3.5 filesystems don't have them. + */ if (old_format_only(s)) { if (reiserfs_xattrs_optional(s)) { - /* Old format filesystem, but optional xattrs have - * been enabled. Error out. */ + /* + * Old format filesystem, but optional xattrs have + * been enabled. Error out. + */ reiserfs_warning(s, "jdm-2005", "xattrs/ACLs not supported " "on pre-v3.6 format filesystems. " @@ -972,9 +990,11 @@ int reiserfs_lookup_privroot(struct super_block *s) return err; } -/* We need to take a copy of the mount flags since things like +/* + * We need to take a copy of the mount flags since things like * MS_RDONLY don't get set until *after* we're called. - * mount_flags != mount_options */ + * mount_flags != mount_options + */ int reiserfs_xattr_init(struct super_block *s, int mount_flags) { int err = 0; diff --git a/fs/reiserfs/xattr.h b/fs/reiserfs/xattr.h index f59626c5d33b..857ec7e3016f 100644 --- a/fs/reiserfs/xattr.h +++ b/fs/reiserfs/xattr.h @@ -61,7 +61,8 @@ static inline loff_t reiserfs_xattr_nblocks(struct inode *inode, loff_t size) return ret; } -/* We may have to create up to 3 objects: xattr root, xattr dir, xattr file. +/* + * We may have to create up to 3 objects: xattr root, xattr dir, xattr file. * Let's try to be smart about it. * xattr root: We cache it. If it's not cached, we may need to create it. * xattr dir: If anything has been loaded for this inode, we can set a flag diff --git a/fs/reiserfs/xattr_acl.c b/fs/reiserfs/xattr_acl.c index a6ce532402dc..a333a073bea8 100644 --- a/fs/reiserfs/xattr_acl.c +++ b/fs/reiserfs/xattr_acl.c @@ -25,8 +25,10 @@ reiserfs_set_acl(struct inode *inode, struct posix_acl *acl, int type) int size = acl ? posix_acl_xattr_size(acl->a_count) : 0; - /* Pessimism: We can't assume that anything from the xattr root up - * has been created. */ + /* + * Pessimism: We can't assume that anything from the xattr root up + * has been created. + */ jcreate_blocks = reiserfs_xattr_jcreate_nblocks(inode) + reiserfs_xattr_nblocks(inode, size) * 2; @@ -208,8 +210,10 @@ struct posix_acl *reiserfs_get_acl(struct inode *inode, int type) retval = reiserfs_xattr_get(inode, name, value, size); if (retval == -ENODATA || retval == -ENOSYS) { - /* This shouldn't actually happen as it should have - been caught above.. but just in case */ + /* + * This shouldn't actually happen as it should have + * been caught above.. but just in case + */ acl = NULL; } else if (retval < 0) { acl = ERR_PTR(retval); @@ -290,8 +294,10 @@ __reiserfs_set_acl(struct reiserfs_transaction_handle *th, struct inode *inode, return error; } -/* dir->i_mutex: locked, - * inode is new and not released into the wild yet */ +/* + * dir->i_mutex: locked, + * inode is new and not released into the wild yet + */ int reiserfs_inherit_default_acl(struct reiserfs_transaction_handle *th, struct inode *dir, struct dentry *dentry, @@ -304,14 +310,18 @@ reiserfs_inherit_default_acl(struct reiserfs_transaction_handle *th, if (S_ISLNK(inode->i_mode)) return 0; - /* ACLs can only be used on "new" objects, so if it's an old object - * there is nothing to inherit from */ + /* + * ACLs can only be used on "new" objects, so if it's an old object + * there is nothing to inherit from + */ if (get_inode_sd_version(dir) == STAT_DATA_V1) goto apply_umask; - /* Don't apply ACLs to objects in the .reiserfs_priv tree.. This + /* + * Don't apply ACLs to objects in the .reiserfs_priv tree.. This * would be useless since permissions are ignored, and a pain because - * it introduces locking cycles */ + * it introduces locking cycles + */ if (IS_PRIVATE(dir)) { inode->i_flags |= S_PRIVATE; goto apply_umask; |