diff options
author | Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> | 2010-05-23 01:39:02 +0900 |
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committer | Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> | 2010-07-23 10:02:08 +0900 |
commit | 8b94025c00f9171b41ba9c1696943f5c935b62ef (patch) | |
tree | 97f770d1f1aa6d57c1a070514d4f933ffc4d467c /fs/nilfs2/recovery.c | |
parent | 92c60ccaf3c15a06d859682b980de1066641b4d0 (diff) | |
download | linux-8b94025c00f9171b41ba9c1696943f5c935b62ef.tar.bz2 |
nilfs2: refactor recovery logic routines
Most functions in recovery code take an argument of a super block
instance or a nilfs_sb_info struct for convenience sake.
This replaces them aggressively with a nilfs object by applying
__bread and __breadahead against routines using sb_bread and
sb_breadahead.
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Diffstat (limited to 'fs/nilfs2/recovery.c')
-rw-r--r-- | fs/nilfs2/recovery.c | 160 |
1 files changed, 94 insertions, 66 deletions
diff --git a/fs/nilfs2/recovery.c b/fs/nilfs2/recovery.c index bae2a516b4ee..1c883b1074eb 100644 --- a/fs/nilfs2/recovery.c +++ b/fs/nilfs2/recovery.c @@ -110,8 +110,8 @@ static void store_segsum_info(struct nilfs_segsum_info *ssi, } /** - * calc_crc_cont - check CRC of blocks continuously - * @sbi: nilfs_sb_info + * nilfs_compute_checksum - compute checksum of blocks continuously + * @nilfs: nilfs object * @bhs: buffer head of start block * @sum: place to store result * @offset: offset bytes in the first block @@ -119,23 +119,25 @@ static void store_segsum_info(struct nilfs_segsum_info *ssi, * @start: DBN of start block * @nblock: number of blocks to be checked */ -static int calc_crc_cont(struct nilfs_sb_info *sbi, struct buffer_head *bhs, - u32 *sum, unsigned long offset, u64 check_bytes, - sector_t start, unsigned long nblock) +static int nilfs_compute_checksum(struct the_nilfs *nilfs, + struct buffer_head *bhs, u32 *sum, + unsigned long offset, u64 check_bytes, + sector_t start, unsigned long nblock) { - unsigned long blocksize = sbi->s_super->s_blocksize; + unsigned int blocksize = nilfs->ns_blocksize; unsigned long size; u32 crc; BUG_ON(offset >= blocksize); check_bytes -= offset; size = min_t(u64, check_bytes, blocksize - offset); - crc = crc32_le(sbi->s_nilfs->ns_crc_seed, + crc = crc32_le(nilfs->ns_crc_seed, (unsigned char *)bhs->b_data + offset, size); if (--nblock > 0) { do { - struct buffer_head *bh - = sb_bread(sbi->s_super, ++start); + struct buffer_head *bh; + + bh = __bread(nilfs->ns_bdev, ++start, blocksize); if (!bh) return -EIO; check_bytes -= size; @@ -150,12 +152,12 @@ static int calc_crc_cont(struct nilfs_sb_info *sbi, struct buffer_head *bhs, /** * nilfs_read_super_root_block - read super root block - * @sb: super_block + * @nilfs: nilfs object * @sr_block: disk block number of the super root block * @pbh: address of a buffer_head pointer to return super root buffer * @check: CRC check flag */ -int nilfs_read_super_root_block(struct super_block *sb, sector_t sr_block, +int nilfs_read_super_root_block(struct the_nilfs *nilfs, sector_t sr_block, struct buffer_head **pbh, int check) { struct buffer_head *bh_sr; @@ -164,7 +166,7 @@ int nilfs_read_super_root_block(struct super_block *sb, sector_t sr_block, int ret; *pbh = NULL; - bh_sr = sb_bread(sb, sr_block); + bh_sr = __bread(nilfs->ns_bdev, sr_block, nilfs->ns_blocksize); if (unlikely(!bh_sr)) { ret = NILFS_SEG_FAIL_IO; goto failed; @@ -174,12 +176,13 @@ int nilfs_read_super_root_block(struct super_block *sb, sector_t sr_block, if (check) { unsigned bytes = le16_to_cpu(sr->sr_bytes); - if (bytes == 0 || bytes > sb->s_blocksize) { + if (bytes == 0 || bytes > nilfs->ns_blocksize) { ret = NILFS_SEG_FAIL_CHECKSUM_SUPER_ROOT; goto failed_bh; } - if (calc_crc_cont(NILFS_SB(sb), bh_sr, &crc, - sizeof(sr->sr_sum), bytes, sr_block, 1)) { + if (nilfs_compute_checksum( + nilfs, bh_sr, &crc, sizeof(sr->sr_sum), bytes, + sr_block, 1)) { ret = NILFS_SEG_FAIL_IO; goto failed_bh; } @@ -200,13 +203,13 @@ int nilfs_read_super_root_block(struct super_block *sb, sector_t sr_block, /** * load_segment_summary - read segment summary of the specified partial segment - * @sbi: nilfs_sb_info + * @nilfs: nilfs object * @pseg_start: start disk block number of partial segment * @seg_seq: sequence number requested * @ssi: pointer to nilfs_segsum_info struct to store information */ static int -load_segment_summary(struct nilfs_sb_info *sbi, sector_t pseg_start, +load_segment_summary(struct the_nilfs *nilfs, sector_t pseg_start, u64 seg_seq, struct nilfs_segsum_info *ssi) { struct buffer_head *bh_sum; @@ -215,7 +218,7 @@ load_segment_summary(struct nilfs_sb_info *sbi, sector_t pseg_start, u32 crc; int ret = NILFS_SEG_FAIL_IO; - bh_sum = sb_bread(sbi->s_super, pseg_start); + bh_sum = __bread(nilfs->ns_bdev, pseg_start, nilfs->ns_blocksize); if (!bh_sum) goto out; @@ -226,22 +229,21 @@ load_segment_summary(struct nilfs_sb_info *sbi, sector_t pseg_start, ret = NILFS_SEG_FAIL_MAGIC; goto failed; } - store_segsum_info(ssi, sum, sbi->s_super->s_blocksize); + store_segsum_info(ssi, sum, nilfs->ns_blocksize); if (seg_seq != ssi->seg_seq) { ret = NILFS_SEG_FAIL_SEQ; goto failed; } nblock = ssi->nblocks; - if (unlikely(nblock == 0 || - nblock > sbi->s_nilfs->ns_blocks_per_segment)) { + if (unlikely(nblock == 0 || nblock > nilfs->ns_blocks_per_segment)) { /* This limits the number of blocks read in the CRC check */ ret = NILFS_SEG_FAIL_CONSISTENCY; goto failed; } - if (calc_crc_cont(sbi, bh_sum, &crc, sizeof(sum->ss_datasum), - ((u64)nblock << sbi->s_super->s_blocksize_bits), - pseg_start, nblock)) { + if (nilfs_compute_checksum(nilfs, bh_sum, &crc, sizeof(sum->ss_datasum), + ((u64)nblock << nilfs->ns_blocksize_bits), + pseg_start, nblock)) { ret = NILFS_SEG_FAIL_IO; goto failed; } @@ -255,8 +257,16 @@ load_segment_summary(struct nilfs_sb_info *sbi, sector_t pseg_start, return ret; } -static void *segsum_get(struct super_block *sb, struct buffer_head **pbh, - unsigned int *offset, unsigned int bytes) +/** + * nilfs_read_summary_info - read an item on summary blocks of a log + * @nilfs: nilfs object + * @pbh: the current buffer head on summary blocks [in, out] + * @offset: the current byte offset on summary blocks [in, out] + * @bytes: byte size of the item to be read + */ +static void *nilfs_read_summary_info(struct the_nilfs *nilfs, + struct buffer_head **pbh, + unsigned int *offset, unsigned int bytes) { void *ptr; sector_t blocknr; @@ -265,7 +275,8 @@ static void *segsum_get(struct super_block *sb, struct buffer_head **pbh, if (bytes > (*pbh)->b_size - *offset) { blocknr = (*pbh)->b_blocknr; brelse(*pbh); - *pbh = sb_bread(sb, blocknr + 1); + *pbh = __bread(nilfs->ns_bdev, blocknr + 1, + nilfs->ns_blocksize); if (unlikely(!*pbh)) return NULL; *offset = 0; @@ -275,9 +286,18 @@ static void *segsum_get(struct super_block *sb, struct buffer_head **pbh, return ptr; } -static void segsum_skip(struct super_block *sb, struct buffer_head **pbh, - unsigned int *offset, unsigned int bytes, - unsigned long count) +/** + * nilfs_skip_summary_info - skip items on summary blocks of a log + * @nilfs: nilfs object + * @pbh: the current buffer head on summary blocks [in, out] + * @offset: the current byte offset on summary blocks [in, out] + * @bytes: byte size of the item to be skipped + * @count: number of items to be skipped + */ +static void nilfs_skip_summary_info(struct the_nilfs *nilfs, + struct buffer_head **pbh, + unsigned int *offset, unsigned int bytes, + unsigned long count) { unsigned int rest_item_in_current_block = ((*pbh)->b_size - *offset) / bytes; @@ -294,26 +314,33 @@ static void segsum_skip(struct super_block *sb, struct buffer_head **pbh, *offset = bytes * (count - (bcnt - 1) * nitem_per_block); brelse(*pbh); - *pbh = sb_bread(sb, blocknr + bcnt); + *pbh = __bread(nilfs->ns_bdev, blocknr + bcnt, + nilfs->ns_blocksize); } } -static int -collect_blocks_from_segsum(struct nilfs_sb_info *sbi, sector_t sum_blocknr, - struct nilfs_segsum_info *ssi, - struct list_head *head) +/** + * nilfs_scan_dsync_log - get block information of a log written for data sync + * @nilfs: nilfs object + * @start_blocknr: start block number of the log + * @ssi: log summary information + * @head: list head to add nilfs_recovery_block struct + */ +static int nilfs_scan_dsync_log(struct the_nilfs *nilfs, sector_t start_blocknr, + struct nilfs_segsum_info *ssi, + struct list_head *head) { struct buffer_head *bh; unsigned int offset; unsigned long nfinfo = ssi->nfinfo; - sector_t blocknr = sum_blocknr + ssi->nsumblk; + sector_t blocknr = start_blocknr + ssi->nsumblk; ino_t ino; int err = -EIO; if (!nfinfo) return 0; - bh = sb_bread(sbi->s_super, sum_blocknr); + bh = __bread(nilfs->ns_bdev, start_blocknr, nilfs->ns_blocksize); if (unlikely(!bh)) goto out; @@ -323,7 +350,8 @@ collect_blocks_from_segsum(struct nilfs_sb_info *sbi, sector_t sum_blocknr, unsigned long nblocks, ndatablk, nnodeblk; struct nilfs_finfo *finfo; - finfo = segsum_get(sbi->s_super, &bh, &offset, sizeof(*finfo)); + finfo = nilfs_read_summary_info(nilfs, &bh, &offset, + sizeof(*finfo)); if (unlikely(!finfo)) goto out; @@ -336,8 +364,8 @@ collect_blocks_from_segsum(struct nilfs_sb_info *sbi, sector_t sum_blocknr, struct nilfs_recovery_block *rb; struct nilfs_binfo_v *binfo; - binfo = segsum_get(sbi->s_super, &bh, &offset, - sizeof(*binfo)); + binfo = nilfs_read_summary_info(nilfs, &bh, &offset, + sizeof(*binfo)); if (unlikely(!binfo)) goto out; @@ -355,9 +383,9 @@ collect_blocks_from_segsum(struct nilfs_sb_info *sbi, sector_t sum_blocknr, } if (--nfinfo == 0) break; - blocknr += nnodeblk; /* always 0 for the data sync segments */ - segsum_skip(sbi->s_super, &bh, &offset, sizeof(__le64), - nnodeblk); + blocknr += nnodeblk; /* always 0 for data sync logs */ + nilfs_skip_summary_info(nilfs, &bh, &offset, sizeof(__le64), + nnodeblk); if (unlikely(!bh)) goto out; } @@ -467,14 +495,14 @@ static int nilfs_prepare_segment_for_recovery(struct the_nilfs *nilfs, return err; } -static int nilfs_recovery_copy_block(struct nilfs_sb_info *sbi, +static int nilfs_recovery_copy_block(struct the_nilfs *nilfs, struct nilfs_recovery_block *rb, struct page *page) { struct buffer_head *bh_org; void *kaddr; - bh_org = sb_bread(sbi->s_super, rb->blocknr); + bh_org = __bread(nilfs->ns_bdev, rb->blocknr, nilfs->ns_blocksize); if (unlikely(!bh_org)) return -EIO; @@ -485,13 +513,14 @@ static int nilfs_recovery_copy_block(struct nilfs_sb_info *sbi, return 0; } -static int recover_dsync_blocks(struct nilfs_sb_info *sbi, - struct list_head *head, - unsigned long *nr_salvaged_blocks) +static int nilfs_recover_dsync_blocks(struct the_nilfs *nilfs, + struct nilfs_sb_info *sbi, + struct list_head *head, + unsigned long *nr_salvaged_blocks) { struct inode *inode; struct nilfs_recovery_block *rb, *n; - unsigned blocksize = sbi->s_super->s_blocksize; + unsigned blocksize = nilfs->ns_blocksize; struct page *page; loff_t pos; int err = 0, err2 = 0; @@ -511,7 +540,7 @@ static int recover_dsync_blocks(struct nilfs_sb_info *sbi, if (unlikely(err)) goto failed_inode; - err = nilfs_recovery_copy_block(sbi, rb, page); + err = nilfs_recovery_copy_block(nilfs, rb, page); if (unlikely(err)) goto failed_page; @@ -551,8 +580,8 @@ static int recover_dsync_blocks(struct nilfs_sb_info *sbi, /** * nilfs_do_roll_forward - salvage logical segments newer than the latest * checkpoint + * @nilfs: nilfs object * @sbi: nilfs_sb_info - * @nilfs: the_nilfs * @ri: pointer to a nilfs_recovery_info */ static int nilfs_do_roll_forward(struct the_nilfs *nilfs, @@ -582,7 +611,7 @@ static int nilfs_do_roll_forward(struct the_nilfs *nilfs, while (segnum != ri->ri_segnum || pseg_start <= ri->ri_pseg_start) { - ret = load_segment_summary(sbi, pseg_start, seg_seq, &ssi); + ret = load_segment_summary(nilfs, pseg_start, seg_seq, &ssi); if (ret) { if (ret == NILFS_SEG_FAIL_IO) { err = -EIO; @@ -610,13 +639,14 @@ static int nilfs_do_roll_forward(struct the_nilfs *nilfs, if (!NILFS_SEG_DSYNC(&ssi)) goto confused; - err = collect_blocks_from_segsum( - sbi, pseg_start, &ssi, &dsync_blocks); + err = nilfs_scan_dsync_log(nilfs, pseg_start, &ssi, + &dsync_blocks); if (unlikely(err)) goto failed; if (NILFS_SEG_LOGEND(&ssi)) { - err = recover_dsync_blocks( - sbi, &dsync_blocks, &nsalvaged_blocks); + err = nilfs_recover_dsync_blocks( + nilfs, sbi, &dsync_blocks, + &nsalvaged_blocks); if (unlikely(err)) goto failed; state = RF_INIT_ST; @@ -653,7 +683,7 @@ static int nilfs_do_roll_forward(struct the_nilfs *nilfs, } out: dispose_recovery_list(&dsync_blocks); - nilfs_detach_writer(sbi->s_nilfs, sbi); + nilfs_detach_writer(nilfs, sbi); return err; confused: @@ -667,7 +697,6 @@ static int nilfs_do_roll_forward(struct the_nilfs *nilfs, } static void nilfs_finish_roll_forward(struct the_nilfs *nilfs, - struct nilfs_sb_info *sbi, struct nilfs_recovery_info *ri) { struct buffer_head *bh; @@ -677,7 +706,7 @@ static void nilfs_finish_roll_forward(struct the_nilfs *nilfs, nilfs_get_segnum_of_block(nilfs, ri->ri_super_root)) return; - bh = sb_getblk(sbi->s_super, ri->ri_lsegs_start); + bh = __getblk(nilfs->ns_bdev, ri->ri_lsegs_start, nilfs->ns_blocksize); BUG_ON(!bh); memset(bh->b_data, 0, bh->b_size); set_buffer_dirty(bh); @@ -751,7 +780,7 @@ int nilfs_recover_logical_segments(struct the_nilfs *nilfs, goto failed; } - nilfs_finish_roll_forward(nilfs, sbi, ri); + nilfs_finish_roll_forward(nilfs, ri); } failed: @@ -762,7 +791,6 @@ int nilfs_recover_logical_segments(struct the_nilfs *nilfs, /** * nilfs_search_super_root - search the latest valid super root * @nilfs: the_nilfs - * @sbi: nilfs_sb_info * @ri: pointer to a nilfs_recovery_info struct to store search results. * * nilfs_search_super_root() looks for the latest super-root from a partial @@ -776,7 +804,7 @@ int nilfs_recover_logical_segments(struct the_nilfs *nilfs, * * %-EIO - I/O error */ -int nilfs_search_super_root(struct the_nilfs *nilfs, struct nilfs_sb_info *sbi, +int nilfs_search_super_root(struct the_nilfs *nilfs, struct nilfs_recovery_info *ri) { struct nilfs_segsum_info ssi; @@ -801,11 +829,10 @@ int nilfs_search_super_root(struct the_nilfs *nilfs, struct nilfs_sb_info *sbi, /* Read ahead segment */ b = seg_start; while (b <= seg_end) - sb_breadahead(sbi->s_super, b++); + __breadahead(nilfs->ns_bdev, b++, nilfs->ns_blocksize); for (;;) { - /* Load segment summary */ - ret = load_segment_summary(sbi, pseg_start, seg_seq, &ssi); + ret = load_segment_summary(nilfs, pseg_start, seg_seq, &ssi); if (ret) { if (ret == NILFS_SEG_FAIL_IO) goto failed; @@ -836,7 +863,8 @@ int nilfs_search_super_root(struct the_nilfs *nilfs, struct nilfs_sb_info *sbi, if (pseg_start == seg_start) { nilfs_get_segment_range(nilfs, nextnum, &b, &end); while (b <= end) - sb_breadahead(sbi->s_super, b++); + __breadahead(nilfs->ns_bdev, b++, + nilfs->ns_blocksize); } if (!NILFS_SEG_HAS_SR(&ssi)) { if (!ri->ri_lsegs_start && NILFS_SEG_LOGBGN(&ssi)) { |