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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /fs/reiserfs/journal.c
downloadlinux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.bz2
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'fs/reiserfs/journal.c')
-rw-r--r--fs/reiserfs/journal.c3876
1 files changed, 3876 insertions, 0 deletions
diff --git a/fs/reiserfs/journal.c b/fs/reiserfs/journal.c
new file mode 100644
index 000000000000..c9ad3a7849f4
--- /dev/null
+++ b/fs/reiserfs/journal.c
@@ -0,0 +1,3876 @@
+/*
+** Write ahead logging implementation copyright Chris Mason 2000
+**
+** The background commits make this code very interelated, 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/config.h>
+#include <asm/uaccess.h>
+#include <asm/system.h>
+
+#include <linux/time.h>
+#include <asm/semaphore.h>
+
+#include <linux/vmalloc.h>
+#include <linux/reiserfs_fs.h>
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/fcntl.h>
+#include <linux/stat.h>
+#include <linux/string.h>
+#include <linux/smp_lock.h>
+#include <linux/buffer_head.h>
+#include <linux/workqueue.h>
+#include <linux/writeback.h>
+#include <linux/blkdev.h>
+
+
+/* gets a struct reiserfs_journal_list * from a list head */
+#define JOURNAL_LIST_ENTRY(h) (list_entry((h), struct reiserfs_journal_list, \
+ j_list))
+#define JOURNAL_WORK_ENTRY(h) (list_entry((h), struct reiserfs_journal_list, \
+ j_working_list))
+
+/* the number of mounted filesystems. This is used to decide when to
+** start and kill the commit workqueue
+*/
+static int reiserfs_mounted_fs_count;
+
+static struct workqueue_struct *commit_wq;
+
+#define JOURNAL_TRANS_HALF 1018 /* must be correct to keep the desc and commit
+ structs at 4k */
+#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 */
+
+#define BLOCK_NEEDS_FLUSH 4 /* used in flush_journal_list */
+#define BLOCK_DIRTIED 5
+
+
+/* journal list state bits */
+#define LIST_TOUCHED 1
+#define LIST_DIRTY 2
+#define LIST_COMMIT_PENDING 4 /* someone will commit this list */
+
+/* flags for do_journal_end */
+#define FLUSH_ALL 1 /* flush commit and real blocks */
+#define COMMIT_NOW 2 /* end and commit this transaction */
+#define WAIT 4 /* wait for the log blocks to hit the disk*/
+
+static int do_journal_end(struct reiserfs_transaction_handle *,struct super_block *,unsigned long nblocks,int flags) ;
+static int flush_journal_list(struct super_block *s, struct reiserfs_journal_list *jl, int flushall) ;
+static int flush_commit_list(struct super_block *s, struct reiserfs_journal_list *jl, int flushall) ;
+static int can_dirty(struct reiserfs_journal_cnode *cn) ;
+static int journal_join(struct reiserfs_transaction_handle *th, struct super_block *p_s_sb, unsigned long nblocks);
+static int release_journal_dev( struct super_block *super,
+ struct reiserfs_journal *journal );
+static int dirty_one_transaction(struct super_block *s,
+ struct reiserfs_journal_list *jl);
+static void flush_async_commits(void *p);
+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 */
+};
+
+static int do_journal_begin_r(struct reiserfs_transaction_handle *th,
+ struct super_block * p_s_sb,
+ unsigned long nblocks,int join);
+
+static void init_journal_hash(struct super_block *p_s_sb) {
+ struct reiserfs_journal *journal = SB_JOURNAL (p_s_sb);
+ memset(journal->j_hash_table, 0, JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *)) ;
+}
+
+/*
+** 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) {
+ clear_buffer_dirty(bh);
+ clear_buffer_journal_test(bh);
+ }
+ return 0 ;
+}
+
+static void disable_barrier(struct super_block *s)
+{
+ REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_BARRIER_FLUSH);
+ printk("reiserfs: disabling flush barriers on %s\n", reiserfs_bdevname(s));
+}
+
+static struct reiserfs_bitmap_node *
+allocate_bitmap_node(struct super_block *p_s_sb) {
+ struct reiserfs_bitmap_node *bn ;
+ static int id;
+
+ bn = reiserfs_kmalloc(sizeof(struct reiserfs_bitmap_node), GFP_NOFS, p_s_sb) ;
+ if (!bn) {
+ return NULL ;
+ }
+ bn->data = reiserfs_kmalloc(p_s_sb->s_blocksize, GFP_NOFS, p_s_sb) ;
+ if (!bn->data) {
+ reiserfs_kfree(bn, sizeof(struct reiserfs_bitmap_node), p_s_sb) ;
+ return NULL ;
+ }
+ bn->id = id++ ;
+ memset(bn->data, 0, p_s_sb->s_blocksize) ;
+ INIT_LIST_HEAD(&bn->list) ;
+ return bn ;
+}
+
+static struct reiserfs_bitmap_node *
+get_bitmap_node(struct super_block *p_s_sb) {
+ struct reiserfs_journal *journal = SB_JOURNAL (p_s_sb);
+ struct reiserfs_bitmap_node *bn = NULL;
+ struct list_head *entry = journal->j_bitmap_nodes.next ;
+
+ journal->j_used_bitmap_nodes++ ;
+repeat:
+
+ if(entry != &journal->j_bitmap_nodes) {
+ bn = list_entry(entry, struct reiserfs_bitmap_node, list) ;
+ list_del(entry) ;
+ memset(bn->data, 0, p_s_sb->s_blocksize) ;
+ journal->j_free_bitmap_nodes-- ;
+ return bn ;
+ }
+ bn = allocate_bitmap_node(p_s_sb) ;
+ if (!bn) {
+ yield();
+ goto repeat ;
+ }
+ return bn ;
+}
+static inline void free_bitmap_node(struct super_block *p_s_sb,
+ struct reiserfs_bitmap_node *bn) {
+ struct reiserfs_journal *journal = SB_JOURNAL (p_s_sb);
+ journal->j_used_bitmap_nodes-- ;
+ if (journal->j_free_bitmap_nodes > REISERFS_MAX_BITMAP_NODES) {
+ reiserfs_kfree(bn->data, p_s_sb->s_blocksize, p_s_sb) ;
+ reiserfs_kfree(bn, sizeof(struct reiserfs_bitmap_node), p_s_sb) ;
+ } else {
+ list_add(&bn->list, &journal->j_bitmap_nodes) ;
+ journal->j_free_bitmap_nodes++ ;
+ }
+}
+
+static void allocate_bitmap_nodes(struct super_block *p_s_sb) {
+ int i ;
+ struct reiserfs_journal *journal = SB_JOURNAL (p_s_sb);
+ struct reiserfs_bitmap_node *bn = NULL ;
+ for (i = 0 ; i < REISERFS_MIN_BITMAP_NODES ; i++) {
+ bn = allocate_bitmap_node(p_s_sb) ;
+ if (bn) {
+ 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
+ }
+ }
+}
+
+static int set_bit_in_list_bitmap(struct super_block *p_s_sb, int block,
+ struct reiserfs_list_bitmap *jb) {
+ int bmap_nr = block / (p_s_sb->s_blocksize << 3) ;
+ int bit_nr = block % (p_s_sb->s_blocksize << 3) ;
+
+ if (!jb->bitmaps[bmap_nr]) {
+ jb->bitmaps[bmap_nr] = get_bitmap_node(p_s_sb) ;
+ }
+ set_bit(bit_nr, (unsigned long *)jb->bitmaps[bmap_nr]->data) ;
+ return 0 ;
+}
+
+static void cleanup_bitmap_list(struct super_block *p_s_sb,
+ struct reiserfs_list_bitmap *jb) {
+ int i;
+ if (jb->bitmaps == NULL)
+ return;
+
+ for (i = 0 ; i < SB_BMAP_NR(p_s_sb) ; i++) {
+ if (jb->bitmaps[i]) {
+ free_bitmap_node(p_s_sb, jb->bitmaps[i]) ;
+ jb->bitmaps[i] = NULL ;
+ }
+ }
+}
+
+/*
+** only call this on FS unmount.
+*/
+static int free_list_bitmaps(struct super_block *p_s_sb,
+ struct reiserfs_list_bitmap *jb_array) {
+ int i ;
+ struct reiserfs_list_bitmap *jb ;
+ for (i = 0 ; i < JOURNAL_NUM_BITMAPS ; i++) {
+ jb = jb_array + i ;
+ jb->journal_list = NULL ;
+ cleanup_bitmap_list(p_s_sb, jb) ;
+ vfree(jb->bitmaps) ;
+ jb->bitmaps = NULL ;
+ }
+ return 0;
+}
+
+static int free_bitmap_nodes(struct super_block *p_s_sb) {
+ struct reiserfs_journal *journal = SB_JOURNAL (p_s_sb);
+ struct list_head *next = journal->j_bitmap_nodes.next ;
+ struct reiserfs_bitmap_node *bn ;
+
+ while(next != &journal->j_bitmap_nodes) {
+ bn = list_entry(next, struct reiserfs_bitmap_node, list) ;
+ list_del(next) ;
+ reiserfs_kfree(bn->data, p_s_sb->s_blocksize, p_s_sb) ;
+ reiserfs_kfree(bn, sizeof(struct reiserfs_bitmap_node), p_s_sb) ;
+ next = journal->j_bitmap_nodes.next ;
+ journal->j_free_bitmap_nodes-- ;
+ }
+
+ return 0 ;
+}
+
+/*
+** 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 *p_s_sb,
+ struct reiserfs_list_bitmap *jb_array,
+ int bmap_nr) {
+ int i ;
+ int failed = 0 ;
+ struct reiserfs_list_bitmap *jb ;
+ int mem = bmap_nr * sizeof(struct reiserfs_bitmap_node *) ;
+
+ for (i = 0 ; i < JOURNAL_NUM_BITMAPS ; i++) {
+ jb = jb_array + i ;
+ jb->journal_list = NULL ;
+ jb->bitmaps = vmalloc( mem ) ;
+ if (!jb->bitmaps) {
+ reiserfs_warning(p_s_sb, "clm-2000, unable to allocate bitmaps for journal lists") ;
+ failed = 1;
+ break ;
+ }
+ memset(jb->bitmaps, 0, mem) ;
+ }
+ if (failed) {
+ free_list_bitmaps(p_s_sb, jb_array) ;
+ return -1 ;
+ }
+ return 0 ;
+}
+
+/*
+** 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 *p_s_sb, struct reiserfs_journal_list *jl) {
+ int i,j ;
+ struct reiserfs_journal *journal = SB_JOURNAL (p_s_sb);
+ struct reiserfs_list_bitmap *jb = NULL ;
+
+ for (j = 0 ; j < (JOURNAL_NUM_BITMAPS * 3) ; j++) {
+ i = journal->j_list_bitmap_index ;
+ journal->j_list_bitmap_index = (i + 1) % JOURNAL_NUM_BITMAPS ;
+ jb = journal->j_list_bitmap + i ;
+ if (journal->j_list_bitmap[i].journal_list) {
+ flush_commit_list(p_s_sb, journal->j_list_bitmap[i].journal_list, 1) ;
+ if (!journal->j_list_bitmap[i].journal_list) {
+ break ;
+ }
+ } else {
+ break ;
+ }
+ }
+ if (jb->journal_list) { /* double check to make sure if flushed correctly */
+ 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
+*/
+static struct reiserfs_journal_cnode *allocate_cnodes(int num_cnodes) {
+ struct reiserfs_journal_cnode *head ;
+ int i ;
+ if (num_cnodes <= 0) {
+ return NULL ;
+ }
+ head = vmalloc(num_cnodes * sizeof(struct reiserfs_journal_cnode)) ;
+ if (!head) {
+ return NULL ;
+ }
+ memset(head, 0, num_cnodes * sizeof(struct reiserfs_journal_cnode)) ;
+ head[0].prev = NULL ;
+ head[0].next = head + 1 ;
+ for (i = 1 ; i < num_cnodes; i++) {
+ head[i].prev = head + (i - 1) ;
+ head[i].next = head + (i + 1) ; /* if last one, overwrite it after the if */
+ }
+ head[num_cnodes -1].next = NULL ;
+ return head ;
+}
+
+/*
+** pulls a cnode off the free list, or returns NULL on failure
+*/
+static struct reiserfs_journal_cnode *get_cnode(struct super_block *p_s_sb) {
+ struct reiserfs_journal_cnode *cn ;
+ struct reiserfs_journal *journal = SB_JOURNAL (p_s_sb);
+
+ reiserfs_check_lock_depth(p_s_sb, "get_cnode") ;
+
+ if (journal->j_cnode_free <= 0) {
+ return NULL ;
+ }
+ journal->j_cnode_used++ ;
+ journal->j_cnode_free-- ;
+ cn = journal->j_cnode_free_list ;
+ if (!cn) {
+ return cn ;
+ }
+ if (cn->next) {
+ cn->next->prev = NULL ;
+ }
+ journal->j_cnode_free_list = cn->next ;
+ memset(cn, 0, sizeof(struct reiserfs_journal_cnode)) ;
+ return cn ;
+}
+
+/*
+** returns a cnode to the free list
+*/
+static void free_cnode(struct super_block *p_s_sb, struct reiserfs_journal_cnode *cn) {
+ struct reiserfs_journal *journal = SB_JOURNAL (p_s_sb);
+
+ reiserfs_check_lock_depth(p_s_sb, "free_cnode") ;
+
+ journal->j_cnode_used-- ;
+ journal->j_cnode_free++ ;
+ /* memset(cn, 0, sizeof(struct reiserfs_journal_cnode)) ; */
+ cn->next = journal->j_cnode_free_list ;
+ if (journal->j_cnode_free_list) {
+ journal->j_cnode_free_list->prev = cn ;
+ }
+ cn->prev = NULL ; /* not needed with the memset, but I might kill the memset, and forget to do this */
+ journal->j_cnode_free_list = cn ;
+}
+
+static void clear_prepared_bits(struct buffer_head *bh) {
+ clear_buffer_journal_prepared (bh);
+ clear_buffer_journal_restore_dirty (bh);
+}
+
+/* utility function to force a BUG if it is called without the big
+** kernel lock held. caller is the string printed just before calling BUG()
+*/
+void reiserfs_check_lock_depth(struct super_block *sb, char *caller) {
+#ifdef CONFIG_SMP
+ if (current->lock_depth < 0) {
+ reiserfs_panic (sb, "%s called without kernel lock held", caller) ;
+ }
+#else
+ ;
+#endif
+}
+
+/* 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,
+ struct reiserfs_journal_cnode **table,
+ long bl)
+{
+ struct reiserfs_journal_cnode *cn ;
+ cn = journal_hash(table, sb, bl) ;
+ while(cn) {
+ if (cn->blocknr == bl && cn->sb == sb)
+ return cn ;
+ cn = cn->hnext ;
+ }
+ return (struct reiserfs_journal_cnode *)0 ;
+}
+
+/*
+** 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 *p_s_sb,
+ int bmap_nr, int bit_nr, int search_all,
+ b_blocknr_t *next_zero_bit) {
+ struct reiserfs_journal *journal = SB_JOURNAL (p_s_sb);
+ struct reiserfs_journal_cnode *cn ;
+ struct reiserfs_list_bitmap *jb ;
+ int i ;
+ unsigned long bl;
+
+ *next_zero_bit = 0 ; /* always start this at zero. */
+
+ PROC_INFO_INC( p_s_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 (search_all) {
+ for (i = 0 ; i < JOURNAL_NUM_BITMAPS ; i++) {
+ PROC_INFO_INC( p_s_sb, journal.in_journal_bitmap );
+ jb = journal->j_list_bitmap + i ;
+ if (jb->journal_list && jb->bitmaps[bmap_nr] &&
+ test_bit(bit_nr, (unsigned long *)jb->bitmaps[bmap_nr]->data)) {
+ *next_zero_bit = find_next_zero_bit((unsigned long *)
+ (jb->bitmaps[bmap_nr]->data),
+ p_s_sb->s_blocksize << 3, bit_nr+1) ;
+ return 1 ;
+ }
+ }
+ }
+
+ bl = bmap_nr * (p_s_sb->s_blocksize << 3) + bit_nr;
+ /* is it in any old transactions? */
+ if (search_all && (cn = get_journal_hash_dev(p_s_sb, journal->j_list_hash_table, bl))) {
+ return 1;
+ }
+
+ /* is it in the current transaction. This should never happen */
+ if ((cn = get_journal_hash_dev(p_s_sb, journal->j_hash_table, bl))) {
+ BUG();
+ return 1;
+ }
+
+ PROC_INFO_INC( p_s_sb, journal.in_journal_reusable );
+ /* safe for reuse */
+ return 0 ;
+}
+
+/* insert cn into table
+*/
+static inline void insert_journal_hash(struct reiserfs_journal_cnode **table, struct reiserfs_journal_cnode *cn) {
+ struct reiserfs_journal_cnode *cn_orig ;
+
+ cn_orig = journal_hash(table, cn->sb, cn->blocknr) ;
+ cn->hnext = cn_orig ;
+ cn->hprev = NULL ;
+ if (cn_orig) {
+ cn_orig->hprev = cn ;
+ }
+ journal_hash(table, cn->sb, cn->blocknr) = cn ;
+}
+
+/* lock the current transaction */
+inline static void lock_journal(struct super_block *p_s_sb) {
+ PROC_INFO_INC( p_s_sb, journal.lock_journal );
+ down(&SB_JOURNAL(p_s_sb)->j_lock);
+}
+
+/* unlock the current transaction */
+inline static void unlock_journal(struct super_block *p_s_sb) {
+ up(&SB_JOURNAL(p_s_sb)->j_lock);
+}
+
+static inline void get_journal_list(struct reiserfs_journal_list *jl)
+{
+ jl->j_refcount++;
+}
+
+static inline void put_journal_list(struct super_block *s,
+ struct reiserfs_journal_list *jl)
+{
+ if (jl->j_refcount < 1) {
+ reiserfs_panic (s, "trans id %lu, refcount at %d", jl->j_trans_id,
+ jl->j_refcount);
+ }
+ if (--jl->j_refcount == 0)
+ reiserfs_kfree(jl, sizeof(struct reiserfs_journal_list), 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.
+*/
+static void cleanup_freed_for_journal_list(struct super_block *p_s_sb, struct reiserfs_journal_list *jl) {
+
+ struct reiserfs_list_bitmap *jb = jl->j_list_bitmap ;
+ if (jb) {
+ cleanup_bitmap_list(p_s_sb, jb) ;
+ }
+ jl->j_list_bitmap->journal_list = NULL ;
+ jl->j_list_bitmap = NULL ;
+}
+
+static int journal_list_still_alive(struct super_block *s,
+ unsigned long trans_id)
+{
+ struct reiserfs_journal *journal = SB_JOURNAL (s);
+ struct list_head *entry = &journal->j_journal_list;
+ struct reiserfs_journal_list *jl;
+
+ if (!list_empty(entry)) {
+ jl = JOURNAL_LIST_ENTRY(entry->next);
+ if (jl->j_trans_id <= trans_id) {
+ return 1;
+ }
+ }
+ return 0;
+}
+
+static void reiserfs_end_buffer_io_sync(struct buffer_head *bh, int uptodate) {
+ char b[BDEVNAME_SIZE];
+
+ if (buffer_journaled(bh)) {
+ reiserfs_warning(NULL, "clm-2084: pinned buffer %lu:%s sent to disk",
+ bh->b_blocknr, bdevname(bh->b_bdev, b)) ;
+ }
+ if (uptodate)
+ set_buffer_uptodate(bh) ;
+ else
+ clear_buffer_uptodate(bh) ;
+ unlock_buffer(bh) ;
+ put_bh(bh) ;
+}
+
+static void reiserfs_end_ordered_io(struct buffer_head *bh, int uptodate) {
+ if (uptodate)
+ set_buffer_uptodate(bh) ;
+ else
+ clear_buffer_uptodate(bh) ;
+ unlock_buffer(bh) ;
+ put_bh(bh) ;
+}
+
+static void submit_logged_buffer(struct buffer_head *bh) {
+ get_bh(bh) ;
+ bh->b_end_io = reiserfs_end_buffer_io_sync ;
+ clear_buffer_journal_new (bh);
+ clear_buffer_dirty(bh) ;
+ if (!test_clear_buffer_journal_test (bh))
+ BUG();
+ if (!buffer_uptodate(bh))
+ BUG();
+ submit_bh(WRITE, bh) ;
+}
+
+static void submit_ordered_buffer(struct buffer_head *bh) {
+ get_bh(bh) ;
+ bh->b_end_io = reiserfs_end_ordered_io;
+ clear_buffer_dirty(bh) ;
+ if (!buffer_uptodate(bh))
+ BUG();
+ submit_bh(WRITE, bh) ;
+}
+
+static int submit_barrier_buffer(struct buffer_head *bh) {
+ get_bh(bh) ;
+ bh->b_end_io = reiserfs_end_ordered_io;
+ clear_buffer_dirty(bh) ;
+ if (!buffer_uptodate(bh))
+ BUG();
+ return submit_bh(WRITE_BARRIER, bh) ;
+}
+
+static void check_barrier_completion(struct super_block *s,
+ struct buffer_head *bh) {
+ if (buffer_eopnotsupp(bh)) {
+ clear_buffer_eopnotsupp(bh);
+ disable_barrier(s);
+ set_buffer_uptodate(bh);
+ set_buffer_dirty(bh);
+ sync_dirty_buffer(bh);
+ }
+}
+
+#define CHUNK_SIZE 32
+struct buffer_chunk {
+ struct buffer_head *bh[CHUNK_SIZE];
+ int nr;
+};
+
+static void write_chunk(struct buffer_chunk *chunk) {
+ int i;
+ for (i = 0; i < chunk->nr ; i++) {
+ submit_logged_buffer(chunk->bh[i]) ;
+ }
+ chunk->nr = 0;
+}
+
+static void write_ordered_chunk(struct buffer_chunk *chunk) {
+ int i;
+ for (i = 0; i < chunk->nr ; i++) {
+ submit_ordered_buffer(chunk->bh[i]) ;
+ }
+ chunk->nr = 0;
+}
+
+static int add_to_chunk(struct buffer_chunk *chunk, struct buffer_head *bh,
+ spinlock_t *lock,
+ void (fn)(struct buffer_chunk *))
+{
+ int ret = 0;
+ if (chunk->nr >= CHUNK_SIZE)
+ BUG();
+ chunk->bh[chunk->nr++] = bh;
+ if (chunk->nr >= CHUNK_SIZE) {
+ ret = 1;
+ if (lock)
+ spin_unlock(lock);
+ fn(chunk);
+ if (lock)
+ spin_lock(lock);
+ }
+ return ret;
+}
+
+
+static atomic_t nr_reiserfs_jh = ATOMIC_INIT(0);
+static struct reiserfs_jh *alloc_jh(void) {
+ struct reiserfs_jh *jh;
+ while(1) {
+ jh = kmalloc(sizeof(*jh), GFP_NOFS);
+ if (jh) {
+ atomic_inc(&nr_reiserfs_jh);
+ return jh;
+ }
+ yield();
+ }
+}
+
+/*
+ * we want to free the jh when the buffer has been written
+ * and waited on
+ */
+void reiserfs_free_jh(struct buffer_head *bh) {
+ struct reiserfs_jh *jh;
+
+ jh = bh->b_private;
+ if (jh) {
+ bh->b_private = NULL;
+ jh->bh = NULL;
+ list_del_init(&jh->list);
+ kfree(jh);
+ if (atomic_read(&nr_reiserfs_jh) <= 0)
+ BUG();
+ atomic_dec(&nr_reiserfs_jh);
+ put_bh(bh);
+ }
+}
+
+static inline int __add_jh(struct reiserfs_journal *j, struct buffer_head *bh,
+ int tail)
+{
+ struct reiserfs_jh *jh;
+
+ if (bh->b_private) {
+ spin_lock(&j->j_dirty_buffers_lock);
+ if (!bh->b_private) {
+ spin_unlock(&j->j_dirty_buffers_lock);
+ goto no_jh;
+ }
+ jh = bh->b_private;
+ list_del_init(&jh->list);
+ } else {
+no_jh:
+ 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
+ * two adds at the same time
+ */
+ if (bh->b_private)
+ BUG();
+ jh->bh = bh;
+ bh->b_private = jh;
+ }
+ jh->jl = j->j_current_jl;
+ if (tail)
+ list_add_tail(&jh->list, &jh->jl->j_tail_bh_list);
+ else {
+ list_add_tail(&jh->list, &jh->jl->j_bh_list);
+ }
+ spin_unlock(&j->j_dirty_buffers_lock);
+ return 0;
+}
+
+int reiserfs_add_tail_list(struct inode *inode, struct buffer_head *bh) {
+ return __add_jh(SB_JOURNAL(inode->i_sb), bh, 1);
+}
+int reiserfs_add_ordered_list(struct inode *inode, struct buffer_head *bh) {
+ return __add_jh(SB_JOURNAL(inode->i_sb), bh, 0);
+}
+
+#define JH_ENTRY(l) list_entry((l), struct reiserfs_jh, list)
+static int write_ordered_buffers(spinlock_t *lock,
+ struct reiserfs_journal *j,
+ struct reiserfs_journal_list *jl,
+ struct list_head *list)
+{
+ struct buffer_head *bh;
+ struct reiserfs_jh *jh;
+ int ret = j->j_errno;
+ struct buffer_chunk chunk;
+ struct list_head tmp;
+ INIT_LIST_HEAD(&tmp);
+
+ chunk.nr = 0;
+ spin_lock(lock);
+ while(!list_empty(list)) {
+ jh = JH_ENTRY(list->next);
+ bh = jh->bh;
+ get_bh(bh);
+ if (test_set_buffer_locked(bh)) {
+ if (!buffer_dirty(bh)) {
+ list_del_init(&jh->list);
+ list_add(&jh->list, &tmp);
+ goto loop_next;
+ }
+ spin_unlock(lock);
+ if (chunk.nr)
+ write_ordered_chunk(&chunk);
+ wait_on_buffer(bh);
+ cond_resched();
+ spin_lock(lock);
+ goto loop_next;
+ }
+ if (buffer_dirty(bh)) {
+ list_del_init(&jh->list);
+ list_add(&jh->list, &tmp);
+ add_to_chunk(&chunk, bh, lock, write_ordered_chunk);
+ } else {
+ reiserfs_free_jh(bh);
+ unlock_buffer(bh);
+ }
+loop_next:
+ put_bh(bh);
+ cond_resched_lock(lock);
+ }
+ if (chunk.nr) {
+ spin_unlock(lock);
+ write_ordered_chunk(&chunk);
+ spin_lock(lock);
+ }
+ while(!list_empty(&tmp)) {
+ jh = JH_ENTRY(tmp.prev);
+ bh = jh->bh;
+ get_bh(bh);
+ reiserfs_free_jh(bh);
+
+ if (buffer_locked(bh)) {
+ spin_unlock(lock);
+ wait_on_buffer(bh);
+ spin_lock(lock);
+ }
+ if (!buffer_uptodate(bh)) {
+ ret = -EIO;
+ }
+ put_bh(bh);
+ cond_resched_lock(lock);
+ }
+ spin_unlock(lock);
+ return ret;
+}
+
+static int flush_older_commits(struct super_block *s, struct reiserfs_journal_list *jl) {
+ struct reiserfs_journal *journal = SB_JOURNAL (s);
+ struct reiserfs_journal_list *other_jl;
+ struct reiserfs_journal_list *first_jl;
+ struct list_head *entry;
+ unsigned long trans_id = jl->j_trans_id;
+ unsigned long other_trans_id;
+ unsigned long first_trans_id;
+
+find_first:
+ /*
+ * first we walk backwards to find the oldest uncommitted transation
+ */
+ first_jl = jl;
+ entry = jl->j_list.prev;
+ while(1) {
+ other_jl = JOURNAL_LIST_ENTRY(entry);
+ if (entry == &journal->j_journal_list ||
+ atomic_read(&other_jl->j_older_commits_done))
+ break;
+
+ first_jl = other_jl;
+ entry = other_jl->j_list.prev;
+ }
+
+ /* if we didn't find any older uncommitted transactions, return now */
+ if (first_jl == jl) {
+ return 0;
+ }
+
+ first_trans_id = first_jl->j_trans_id;
+
+ entry = &first_jl->j_list;
+ while(1) {
+ other_jl = JOURNAL_LIST_ENTRY(entry);
+ other_trans_id = other_jl->j_trans_id;
+
+ if (other_trans_id < trans_id) {
+ if (atomic_read(&other_jl->j_commit_left) != 0) {
+ flush_commit_list(s, other_jl, 0);
+
+ /* list we were called with is gone, return */
+ 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.
+ */
+ if (!journal_list_still_alive(s, other_trans_id)) {
+ goto find_first;
+ }
+ }
+ entry = entry->next;
+ if (entry == &journal->j_journal_list)
+ return 0;
+ } else {
+ return 0;
+ }
+ }
+ return 0;
+}
+int reiserfs_async_progress_wait(struct super_block *s) {
+ DEFINE_WAIT(wait);
+ struct reiserfs_journal *j = SB_JOURNAL(s);
+ if (atomic_read(&j->j_async_throttle))
+ blk_congestion_wait(WRITE, HZ/10);
+ return 0;
+}
+
+/*
+** 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) {
+ int i;
+ int bn ;
+ struct buffer_head *tbh = NULL ;
+ unsigned long trans_id = jl->j_trans_id;
+ struct reiserfs_journal *journal = SB_JOURNAL (s);
+ int barrier = 0;
+ int retval = 0;
+
+ reiserfs_check_lock_depth(s, "flush_commit_list") ;
+
+ if (atomic_read(&jl->j_older_commits_done)) {
+ return 0 ;
+ }
+
+ /* 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);
+
+ get_journal_list(jl);
+ if (flushall) {
+ if (flush_older_commits(s, jl) == 1) {
+ /* list disappeared during flush_older_commits. return */
+ goto put_jl;
+ }
+ }
+
+ /* make sure nobody is trying to flush this one at the same time */
+ down(&jl->j_commit_lock);
+ if (!journal_list_still_alive(s, trans_id)) {
+ up(&jl->j_commit_lock);
+ goto put_jl;
+ }
+ BUG_ON (jl->j_trans_id == 0);
+
+ /* this commit is done, exit */
+ if (atomic_read(&(jl->j_commit_left)) <= 0) {
+ if (flushall) {
+ atomic_set(&(jl->j_older_commits_done), 1) ;
+ }
+ up(&jl->j_commit_lock);
+ goto put_jl;
+ }
+
+ if (!list_empty(&jl->j_bh_list)) {
+ unlock_kernel();
+ write_ordered_buffers(&journal->j_dirty_buffers_lock,
+ journal, jl, &jl->j_bh_list);
+ lock_kernel();
+ }
+ BUG_ON (!list_empty(&jl->j_bh_list));
+ /*
+ * for the description block and all the log blocks, submit any buffers
+ * that haven't already reached the disk
+ */
+ atomic_inc(&journal->j_async_throttle);
+ for (i = 0 ; i < (jl->j_len + 1) ; i++) {
+ bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) + (jl->j_start+i) %
+ SB_ONDISK_JOURNAL_SIZE(s);
+ tbh = journal_find_get_block(s, bn) ;
+ if (buffer_dirty(tbh)) /* redundant, ll_rw_block() checks */
+ ll_rw_block(WRITE, 1, &tbh) ;
+ put_bh(tbh) ;
+ }
+ atomic_dec(&journal->j_async_throttle);
+
+ /* wait on everything written so far before writing the commit
+ * if we are in barrier mode, send the commit down now
+ */
+ barrier = reiserfs_barrier_flush(s);
+ if (barrier) {
+ int ret;
+ lock_buffer(jl->j_commit_bh);
+ ret = submit_barrier_buffer(jl->j_commit_bh);
+ if (ret == -EOPNOTSUPP) {
+ set_buffer_uptodate(jl->j_commit_bh);
+ disable_barrier(s);
+ barrier = 0;
+ }
+ }
+ for (i = 0 ; i < (jl->j_len + 1) ; i++) {
+ bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) +
+ (jl->j_start + i) % SB_ONDISK_JOURNAL_SIZE(s) ;
+ tbh = journal_find_get_block(s, bn) ;
+ wait_on_buffer(tbh) ;
+ // since we're using ll_rw_blk above, it might have skipped over
+ // a locked buffer. Double check here
+ //
+ if (buffer_dirty(tbh)) /* redundant, sync_dirty_buffer() checks */
+ sync_dirty_buffer(tbh);
+ if (unlikely (!buffer_uptodate(tbh))) {
+#ifdef CONFIG_REISERFS_CHECK
+ reiserfs_warning(s, "journal-601, buffer write failed") ;
+#endif
+ retval = -EIO;
+ }
+ put_bh(tbh) ; /* once for journal_find_get_block */
+ put_bh(tbh) ; /* once due to original getblk in do_journal_end */
+ atomic_dec(&(jl->j_commit_left)) ;
+ }
+
+ BUG_ON (atomic_read(&(jl->j_commit_left)) != 1);
+
+ if (!barrier) {
+ if (buffer_dirty(jl->j_commit_bh))
+ BUG();
+ mark_buffer_dirty(jl->j_commit_bh) ;
+ sync_dirty_buffer(jl->j_commit_bh) ;
+ } else
+ wait_on_buffer(jl->j_commit_bh);
+
+ check_barrier_completion(s, jl->j_commit_bh);
+
+ /* 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 propogating 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") ;
+#endif
+ retval = -EIO;
+ }
+ bforget(jl->j_commit_bh) ;
+ if (journal->j_last_commit_id != 0 &&
+ (jl->j_trans_id - journal->j_last_commit_id) != 1) {
+ reiserfs_warning(s, "clm-2200: last commit %lu, current %lu",
+ journal->j_last_commit_id,
+ jl->j_trans_id);
+ }
+ 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 */
+ cleanup_freed_for_journal_list(s, jl) ;
+
+ retval = retval ? retval : journal->j_errno;
+
+ /* mark the metadata dirty */
+ if (!retval)
+ dirty_one_transaction(s, jl);
+ atomic_dec(&(jl->j_commit_left)) ;
+
+ if (flushall) {
+ atomic_set(&(jl->j_older_commits_done), 1) ;
+ }
+ up(&jl->j_commit_lock);
+put_jl:
+ put_journal_list(s, jl);
+
+ if (retval)
+ reiserfs_abort (s, retval, "Journal write error in %s", __FUNCTION__);
+ return retval;
+}
+
+/*
+** 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) {
+ struct super_block *sb = cn->sb;
+ b_blocknr_t blocknr = cn->blocknr ;
+
+ cn = cn->hprev ;
+ while(cn) {
+ if (cn->sb == sb && cn->blocknr == blocknr && cn->jlist) {
+ return cn->jlist ;
+ }
+ cn = cn->hprev ;
+ }
+ return NULL ;
+}
+
+static void remove_journal_hash(struct super_block *, struct reiserfs_journal_cnode **,
+struct reiserfs_journal_list *, unsigned long, 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.
+*/
+static void remove_all_from_journal_list(struct super_block *p_s_sb, struct reiserfs_journal_list *jl, int debug) {
+ struct reiserfs_journal *journal = SB_JOURNAL (p_s_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?
+ */
+ while(cn) {
+ if (cn->blocknr != 0) {
+ if (debug) {
+ reiserfs_warning (p_s_sb, "block %u, bh is %d, state %ld", cn->blocknr,
+ cn->bh ? 1: 0, cn->state) ;
+ }
+ cn->state = 0 ;
+ remove_journal_hash(p_s_sb, journal->j_list_hash_table, jl, cn->blocknr, 1) ;
+ }
+ last = cn ;
+ cn = cn->next ;
+ free_cnode(p_s_sb, last) ;
+ }
+ jl->j_realblock = NULL ;
+}
+
+/*
+** 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 *p_s_sb, unsigned long offset, unsigned long trans_id) {
+ struct reiserfs_journal_header *jh ;
+ struct reiserfs_journal *journal = SB_JOURNAL (p_s_sb);
+
+ if (reiserfs_is_journal_aborted (journal))
+ return -EIO;
+
+ if (trans_id >= journal->j_last_flush_trans_id) {
+ if (buffer_locked((journal->j_header_bh))) {
+ wait_on_buffer((journal->j_header_bh)) ;
+ if (unlikely (!buffer_uptodate(journal->j_header_bh))) {
+#ifdef CONFIG_REISERFS_CHECK
+ reiserfs_warning (p_s_sb, "journal-699: buffer write failed") ;
+#endif
+ return -EIO;
+ }
+ }
+ journal->j_last_flush_trans_id = trans_id ;
+ journal->j_first_unflushed_offset = offset ;
+ jh = (struct reiserfs_journal_header *)(journal->j_header_bh->b_data) ;
+ jh->j_last_flush_trans_id = cpu_to_le32(trans_id) ;
+ jh->j_first_unflushed_offset = cpu_to_le32(offset) ;
+ jh->j_mount_id = cpu_to_le32(journal->j_mount_id) ;
+
+ if (reiserfs_barrier_flush(p_s_sb)) {
+ int ret;
+ lock_buffer(journal->j_header_bh);
+ ret = submit_barrier_buffer(journal->j_header_bh);
+ if (ret == -EOPNOTSUPP) {
+ set_buffer_uptodate(journal->j_header_bh);
+ disable_barrier(p_s_sb);
+ goto sync;
+ }
+ wait_on_buffer(journal->j_header_bh);
+ check_barrier_completion(p_s_sb, journal->j_header_bh);
+ } else {
+sync:
+ set_buffer_dirty(journal->j_header_bh) ;
+ sync_dirty_buffer(journal->j_header_bh) ;
+ }
+ if (!buffer_uptodate(journal->j_header_bh)) {
+ reiserfs_warning (p_s_sb, "journal-837: IO error during journal replay");
+ return -EIO ;
+ }
+ }
+ return 0 ;
+}
+
+static int update_journal_header_block(struct super_block *p_s_sb,
+ unsigned long offset,
+ unsigned long trans_id) {
+ return _update_journal_header_block(p_s_sb, offset, trans_id);
+}
+/*
+** flush any and all journal lists older than you are
+** can only be called from flush_journal_list
+*/
+static int flush_older_journal_lists(struct super_block *p_s_sb,
+ struct reiserfs_journal_list *jl)
+{
+ struct list_head *entry;
+ struct reiserfs_journal_list *other_jl ;
+ struct reiserfs_journal *journal = SB_JOURNAL (p_s_sb);
+ unsigned long trans_id = jl->j_trans_id;
+
+ /* we know we are the only ones flushing things, no extra race
+ * protection is required.
+ */
+restart:
+ entry = journal->j_journal_list.next;
+ /* Did we wrap? */
+ if (entry == &journal->j_journal_list)
+ return 0;
+ other_jl = JOURNAL_LIST_ENTRY(entry);
+ if (other_jl->j_trans_id < trans_id) {
+ BUG_ON (other_jl->j_refcount <= 0);
+ /* do not flush all */
+ flush_journal_list(p_s_sb, other_jl, 0) ;
+
+ /* other_jl is now deleted from the list */
+ goto restart;
+ }
+ return 0 ;
+}
+
+static void del_from_work_list(struct super_block *s,
+ struct reiserfs_journal_list *jl) {
+ struct reiserfs_journal *journal = SB_JOURNAL (s);
+ if (!list_empty(&jl->j_working_list)) {
+ list_del_init(&jl->j_working_list);
+ journal->j_num_work_lists--;
+ }
+}
+
+/* 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) {
+ struct reiserfs_journal_list *pjl ;
+ struct reiserfs_journal_cnode *cn, *last ;
+ int count ;
+ int was_jwait = 0 ;
+ int was_dirty = 0 ;
+ struct buffer_head *saved_bh ;
+ unsigned long j_len_saved = jl->j_len ;
+ struct reiserfs_journal *journal = SB_JOURNAL (s);
+ int err = 0;
+
+ BUG_ON (j_len_saved <= 0);
+
+ if (atomic_read(&journal->j_wcount) != 0) {
+ reiserfs_warning(s, "clm-2048: flush_journal_list called with wcount %d",
+ atomic_read(&journal->j_wcount)) ;
+ }
+ BUG_ON (jl->j_trans_id == 0);
+
+ /* if flushall == 0, the lock is already held */
+ if (flushall) {
+ down(&journal->j_flush_sem);
+ } else if (!down_trylock(&journal->j_flush_sem)) {
+ BUG();
+ }
+
+ count = 0 ;
+ if (j_len_saved > journal->j_trans_max) {
+ reiserfs_panic(s, "journal-715: flush_journal_list, length is %lu, trans id %lu\n", j_len_saved, jl->j_trans_id);
+ return 0 ;
+ }
+
+ /* if all the work is already done, get out of here */
+ if (atomic_read(&(jl->j_nonzerolen)) <= 0 &&
+ atomic_read(&(jl->j_commit_left)) <= 0) {
+ goto flush_older_and_return ;
+ }
+
+ /* 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) ;
+
+ if (!(jl->j_state & LIST_DIRTY) && !reiserfs_is_journal_aborted (journal))
+ BUG();
+
+ /* are we done now? */
+ if (atomic_read(&(jl->j_nonzerolen)) <= 0 &&
+ atomic_read(&(jl->j_commit_left)) <= 0) {
+ 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
+ */
+ if (atomic_read(&(journal->j_wcount)) != 0) {
+ reiserfs_panic(s, "journal-844: panic journal list is flushing, wcount is not 0\n") ;
+ }
+ cn = jl->j_realblock ;
+ while(cn) {
+ was_jwait = 0 ;
+ was_dirty = 0 ;
+ saved_bh = NULL ;
+ /* blocknr of 0 is no longer in the hash, ignore it */
+ if (cn->blocknr == 0) {
+ goto free_cnode ;
+ }
+
+ /* 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
+ */
+ if (!pjl && cn->bh) {
+ saved_bh = cn->bh ;
+
+ /* we do this to make sure nobody releases the buffer while
+ ** we are working with it
+ */
+ get_bh(saved_bh) ;
+
+ if (buffer_journal_dirty(saved_bh)) {
+ BUG_ON (!can_dirty (cn));
+ was_jwait = 1 ;
+ was_dirty = 1 ;
+ } else if (can_dirty(cn)) {
+ /* everything with !pjl && jwait should be writable */
+ BUG();
+ }
+ }
+
+ /* if someone has this block in a newer transaction, just make
+ ** sure they are commited, and don't try writing it to disk
+ */
+ if (pjl) {
+ if (atomic_read(&pjl->j_commit_left))
+ flush_commit_list(s, pjl, 1) ;
+ goto free_cnode ;
+ }
+
+ /* 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
+ */
+ if ((!was_jwait) && !buffer_locked(saved_bh)) {
+ reiserfs_warning (s, "journal-813: BAD! buffer %llu %cdirty %cjwait, "
+ "not in a newer tranasction",
+ (unsigned long long)saved_bh->b_blocknr,
+ was_dirty ? ' ' : '!', was_jwait ? ' ' : '!') ;
+ }
+ if (was_dirty) {
+ /* 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);
+ BUG_ON (cn->blocknr != saved_bh->b_blocknr);
+ if (buffer_dirty(saved_bh))
+ submit_logged_buffer(saved_bh) ;
+ else
+ unlock_buffer(saved_bh);
+ count++ ;
+ } else {
+ reiserfs_warning (s, "clm-2082: Unable to flush buffer %llu in %s",
+ (unsigned long long)saved_bh->b_blocknr, __FUNCTION__);
+ }
+free_cnode:
+ last = cn ;
+ cn = cn->next ;
+ if (saved_bh) {
+ /* 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: saved_bh->b_count < 0");
+ }
+ }
+ }
+ if (count > 0) {
+ cn = jl->j_realblock ;
+ while(cn) {
+ if (test_bit(BLOCK_NEEDS_FLUSH, &cn->state)) {
+ if (!cn->bh) {
+ reiserfs_panic(s, "journal-1011: cn->bh is NULL\n") ;
+ }
+ wait_on_buffer(cn->bh) ;
+ if (!cn->bh) {
+ reiserfs_panic(s, "journal-1012: cn->bh is NULL\n") ;
+ }
+ if (unlikely (!buffer_uptodate(cn->bh))) {
+#ifdef CONFIG_REISERFS_CHECK
+ reiserfs_warning(s, "journal-949: buffer write failed\n") ;
+#endif
+ err = -EIO;
+ }
+ /* 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));
+
+ /* undo the inc from journal_mark_dirty */
+ put_bh(cn->bh) ;
+ brelse(cn->bh) ;
+ }
+ cn = cn->next ;
+ }
+ }
+
+ if (err)
+ reiserfs_abort (s, -EIO, "Write error while pushing transaction to disk in %s", __FUNCTION__);
+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
+ */
+ 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
+ */
+ if (!err && flushall) {
+ err = update_journal_header_block(s, (jl->j_start + jl->j_len + 2) % SB_ONDISK_JOURNAL_SIZE(s), jl->j_trans_id) ;
+ if (err)
+ reiserfs_abort (s, -EIO, "Write error while updating journal header in %s", __FUNCTION__);
+ }
+ remove_all_from_journal_list(s, jl, 0) ;
+ list_del_init(&jl->j_list);
+ journal->j_num_lists--;
+ del_from_work_list(s, jl);
+
+ if (journal->j_last_flush_id != 0 &&
+ (jl->j_trans_id - journal->j_last_flush_id) != 1) {
+ reiserfs_warning(s, "clm-2201: last flush %lu, current %lu",
+ journal->j_last_flush_id,
+ jl->j_trans_id);
+ }
+ journal->j_last_flush_id = jl->j_trans_id;
+
+ /* not strictly required since we are freeing the list, but it should
+ * help find code using dead lists later on
+ */
+ jl->j_len = 0 ;
+ atomic_set(&(jl->j_nonzerolen), 0) ;
+ jl->j_start = 0 ;
+ jl->j_realblock = NULL ;
+ jl->j_commit_bh = NULL ;
+ jl->j_trans_id = 0 ;
+ jl->j_state = 0;
+ put_journal_list(s, jl);
+ if (flushall)
+ up(&journal->j_flush_sem);
+ return err ;
+}
+
+static int write_one_transaction(struct super_block *s,
+ struct reiserfs_journal_list *jl,
+ struct buffer_chunk *chunk)
+{
+ struct reiserfs_journal_cnode *cn;
+ int ret = 0 ;
+
+ jl->j_state |= LIST_TOUCHED;
+ del_from_work_list(s, jl);
+ if (jl->j_len == 0 || atomic_read(&jl->j_nonzerolen) == 0) {
+ return 0;
+ }
+
+ cn = jl->j_realblock ;
+ while(cn) {
+ /* 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
+ * to lock_buffer(cn->bh), so we have to inc the buffer
+ * count, and recheck things after locking
+ */
+ tmp_bh = cn->bh;
+ get_bh(tmp_bh);
+ lock_buffer(tmp_bh);
+ if (cn->bh && can_dirty(cn) && buffer_dirty(tmp_bh)) {
+ if (!buffer_journal_dirty(tmp_bh) ||
+ buffer_journal_prepared(tmp_bh))
+ BUG();
+ add_to_chunk(chunk, tmp_bh, NULL, write_chunk);
+ ret++;
+ } else {
+ /* note, cn->bh might be null now */
+ unlock_buffer(tmp_bh);
+ }
+ put_bh(tmp_bh);
+ }
+next:
+ cn = cn->next ;
+ cond_resched();
+ }
+ return ret ;
+}
+
+/* used by flush_commit_list */
+static int dirty_one_transaction(struct super_block *s,
+ struct reiserfs_journal_list *jl)
+{
+ struct reiserfs_journal_cnode *cn;
+ struct reiserfs_journal_list *pjl;
+ int ret = 0 ;
+
+ 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
+ */
+ 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
+ * or restored. If restored, we need to make sure
+ * it actually gets marked dirty
+ */
+ clear_buffer_journal_new (cn->bh);
+ if (buffer_journal_prepared (cn->bh)) {
+ set_buffer_journal_restore_dirty (cn->bh);
+ } else {
+ set_buffer_journal_test (cn->bh);
+ mark_buffer_dirty(cn->bh);
+ }
+ }
+ cn = cn->next ;
+ }
+ return ret ;
+}
+
+static int kupdate_transactions(struct super_block *s,
+ struct reiserfs_journal_list *jl,
+ struct reiserfs_journal_list **next_jl,
+ unsigned long *next_trans_id,
+ int num_blocks,
+ int num_trans) {
+ int ret = 0;
+ int written = 0 ;
+ int transactions_flushed = 0;
+ unsigned long orig_trans_id = jl->j_trans_id;
+ struct buffer_chunk chunk;
+ struct list_head *entry;
+ struct reiserfs_journal *journal = SB_JOURNAL (s);
+ chunk.nr = 0;
+
+ down(&journal->j_flush_sem);
+ if (!journal_list_still_alive(s, orig_trans_id)) {
+ goto done;
+ }
+
+ /* we've got j_flush_sem held, nobody is going to delete any
+ * of these lists out from underneath us
+ */
+ while((num_trans && transactions_flushed < num_trans) ||
+ (!num_trans && written < num_blocks)) {
+
+ if (jl->j_len == 0 || (jl->j_state & LIST_TOUCHED) ||
+ atomic_read(&jl->j_commit_left) || !(jl->j_state & LIST_DIRTY))
+ {
+ del_from_work_list(s, jl);
+ break;
+ }
+ ret = write_one_transaction(s, jl, &chunk);
+
+ if (ret < 0)
+ goto done;
+ transactions_flushed++;
+ written += ret;
+ entry = jl->j_list.next;
+
+ /* did we wrap? */
+ if (entry == &journal->j_journal_list) {
+ break;
+ }
+ jl = JOURNAL_LIST_ENTRY(entry);
+
+ /* don't bother with older transactions */
+ if (jl->j_trans_id <= orig_trans_id)
+ break;
+ }
+ if (chunk.nr) {
+ write_chunk(&chunk);
+ }
+
+done:
+ up(&journal->j_flush_sem);
+ 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
+*/
+static int flush_used_journal_lists(struct super_block *s,
+ struct reiserfs_journal_list *jl) {
+ unsigned long len = 0;
+ unsigned long cur_len;
+ int ret;
+ int i;
+ int limit = 256;
+ struct reiserfs_journal_list *tjl;
+ struct reiserfs_journal_list *flush_jl;
+ unsigned long trans_id;
+ struct reiserfs_journal *journal = SB_JOURNAL (s);
+
+ flush_jl = tjl = jl;
+
+ /* in data logging mode, try harder to flush a lot of blocks */
+ if (reiserfs_data_log(s))
+ limit = 1024;
+ /* flush for 256 transactions or limit blocks, whichever comes first */
+ for(i = 0 ; i < 256 && len < limit ; i++) {
+ if (atomic_read(&tjl->j_commit_left) ||
+ tjl->j_trans_id < jl->j_trans_id) {
+ break;
+ }
+ cur_len = atomic_read(&tjl->j_nonzerolen);
+ if (cur_len > 0) {
+ tjl->j_state &= ~LIST_TOUCHED;
+ }
+ len += cur_len;
+ flush_jl = tjl;
+ if (tjl->j_list.next == &journal->j_journal_list)
+ break;
+ tjl = JOURNAL_LIST_ENTRY(tjl->j_list.next);
+ }
+ /* 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);
+ }
+ flush_journal_list(s, flush_jl, 1);
+ return 0;
+}
+
+/*
+** 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,
+ unsigned long block, int remove_freed)
+{
+ struct reiserfs_journal_cnode *cur ;
+ struct reiserfs_journal_cnode **head ;
+
+ head= &(journal_hash(table, sb, block)) ;
+ if (!head) {
+ return ;
+ }
+ cur = *head ;
+ while(cur) {
+ if (cur->blocknr == block && cur->sb == sb && (jl == NULL || jl == cur->jlist) &&
+ (!test_bit(BLOCK_FREED, &cur->state) || remove_freed)) {
+ if (cur->hnext) {
+ cur->hnext->hprev = cur->hprev ;
+ }
+ if (cur->hprev) {
+ cur->hprev->hnext = cur->hnext ;
+ } else {
+ *head = cur->hnext ;
+ }
+ 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 */
+ atomic_dec(&(cur->jlist->j_nonzerolen)) ;
+ cur->bh = NULL ;
+ cur->jlist = NULL ;
+ }
+ cur = cur->hnext ;
+ }
+}
+
+static void free_journal_ram(struct super_block *p_s_sb) {
+ struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
+ reiserfs_kfree(journal->j_current_jl,
+ sizeof(struct reiserfs_journal_list), p_s_sb);
+ journal->j_num_lists--;
+
+ vfree(journal->j_cnode_free_orig) ;
+ free_list_bitmaps(p_s_sb, journal->j_list_bitmap) ;
+ free_bitmap_nodes(p_s_sb) ; /* must be after free_list_bitmaps */
+ 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
+ */
+ release_journal_dev(p_s_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.
+*/
+static int do_journal_release(struct reiserfs_transaction_handle *th, struct super_block *p_s_sb, int error) {
+ struct reiserfs_transaction_handle myth ;
+ int flushed = 0;
+ struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
+
+ /* we only want to flush out transactions if we were called with error == 0
+ */
+ if (!error && !(p_s_sb->s_flags & MS_RDONLY)) {
+ /* end the current trans */
+ BUG_ON (!th->t_trans_id);
+ do_journal_end(th, p_s_sb,10, FLUSH_ALL) ;
+
+ /* make sure something gets logged to force our way into the flush code */
+ if (!journal_join(&myth, p_s_sb, 1)) {
+ reiserfs_prepare_for_journal(p_s_sb, SB_BUFFER_WITH_SB(p_s_sb), 1) ;
+ journal_mark_dirty(&myth, p_s_sb, SB_BUFFER_WITH_SB(p_s_sb)) ;
+ do_journal_end(&myth, p_s_sb,1, FLUSH_ALL) ;
+ flushed = 1;
+ }
+ }
+
+ /* this also catches errors during the do_journal_end above */
+ if (!error && reiserfs_is_journal_aborted(journal)) {
+ memset(&myth, 0, sizeof(myth));
+ if (!journal_join_abort(&myth, p_s_sb, 1)) {
+ reiserfs_prepare_for_journal(p_s_sb, SB_BUFFER_WITH_SB(p_s_sb), 1) ;
+ journal_mark_dirty(&myth, p_s_sb, SB_BUFFER_WITH_SB(p_s_sb)) ;
+ do_journal_end(&myth, p_s_sb, 1, FLUSH_ALL) ;
+ }
+ }
+
+ reiserfs_mounted_fs_count-- ;
+ /* wait for all commits to finish */
+ cancel_delayed_work(&SB_JOURNAL(p_s_sb)->j_work);
+ flush_workqueue(commit_wq);
+ if (!reiserfs_mounted_fs_count) {
+ destroy_workqueue(commit_wq);
+ commit_wq = NULL;
+ }
+
+ free_journal_ram(p_s_sb) ;
+
+ return 0 ;
+}
+
+/*
+** call on unmount. flush all journal trans, release all alloc'd ram
+*/
+int journal_release(struct reiserfs_transaction_handle *th, struct super_block *p_s_sb) {
+ return do_journal_release(th, p_s_sb, 0) ;
+}
+/*
+** only call from an error condition inside reiserfs_read_super!
+*/
+int journal_release_error(struct reiserfs_transaction_handle *th, struct super_block *p_s_sb) {
+ return do_journal_release(th, p_s_sb, 1) ;
+}
+
+/* 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 *p_s_sb, struct reiserfs_journal_desc *desc,
+ struct reiserfs_journal_commit *commit) {
+ if (get_commit_trans_id (commit) != get_desc_trans_id (desc) ||
+ get_commit_trans_len (commit) != get_desc_trans_len (desc) ||
+ get_commit_trans_len (commit) > SB_JOURNAL(p_s_sb)->j_trans_max ||
+ get_commit_trans_len (commit) <= 0
+ ) {
+ return 1 ;
+ }
+ 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
+*/
+static int journal_transaction_is_valid(struct super_block *p_s_sb, struct buffer_head *d_bh, unsigned long *oldest_invalid_trans_id, unsigned long *newest_mount_id) {
+ struct reiserfs_journal_desc *desc ;
+ struct reiserfs_journal_commit *commit ;
+ struct buffer_head *c_bh ;
+ unsigned long offset ;
+
+ if (!d_bh)
+ return 0 ;
+
+ desc = (struct reiserfs_journal_desc *)d_bh->b_data ;
+ if (get_desc_trans_len(desc) > 0 && !memcmp(get_journal_desc_magic (d_bh), JOURNAL_DESC_MAGIC, 8)) {
+ if (oldest_invalid_trans_id && *oldest_invalid_trans_id && get_desc_trans_id(desc) > *oldest_invalid_trans_id) {
+ reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-986: transaction "
+ "is valid returning because trans_id %d is greater than "
+ "oldest_invalid %lu", get_desc_trans_id(desc),
+ *oldest_invalid_trans_id);
+ return 0 ;
+ }
+ if (newest_mount_id && *newest_mount_id > get_desc_mount_id (desc)) {
+ reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1087: transaction "
+ "is valid returning because mount_id %d is less than "
+ "newest_mount_id %lu", get_desc_mount_id (desc),
+ *newest_mount_id) ;
+ return -1 ;
+ }
+ if ( get_desc_trans_len(desc) > SB_JOURNAL(p_s_sb)->j_trans_max ) {
+ reiserfs_warning(p_s_sb, "journal-2018: Bad transaction length %d encountered, ignoring transaction", get_desc_trans_len(desc));
+ return -1 ;
+ }
+ offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) ;
+
+ /* ok, we have a journal description block, lets see if the transaction was valid */
+ c_bh = journal_bread(p_s_sb, SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) +
+ ((offset + get_desc_trans_len(desc) + 1) % SB_ONDISK_JOURNAL_SIZE(p_s_sb))) ;
+ if (!c_bh)
+ return 0 ;
+ commit = (struct reiserfs_journal_commit *)c_bh->b_data ;
+ if (journal_compare_desc_commit(p_s_sb, desc, commit)) {
+ reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE,
+ "journal_transaction_is_valid, commit offset %ld had bad "
+ "time %d or length %d",
+ c_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb),
+ get_commit_trans_id (commit),
+ get_commit_trans_len(commit));
+ brelse(c_bh) ;
+ if (oldest_invalid_trans_id) {
+ *oldest_invalid_trans_id = get_desc_trans_id(desc) ;
+ reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1004: "
+ "transaction_is_valid setting oldest invalid trans_id "
+ "to %d", get_desc_trans_id(desc)) ;
+ }
+ return -1;
+ }
+ brelse(c_bh) ;
+ reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1006: found valid "
+ "transaction start offset %llu, len %d id %d",
+ d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb),
+ get_desc_trans_len(desc), get_desc_trans_id(desc)) ;
+ return 1 ;
+ } else {
+ return 0 ;
+ }
+}
+
+static void brelse_array(struct buffer_head **heads, int num) {
+ int i ;
+ for (i = 0 ; i < num ; i++) {
+ brelse(heads[i]) ;
+ }
+}
+
+/*
+** 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.
+*/
+static int journal_read_transaction(struct super_block *p_s_sb, unsigned long cur_dblock, unsigned long oldest_start,
+ unsigned long oldest_trans_id, unsigned long newest_mount_id) {
+ struct reiserfs_journal *journal = SB_JOURNAL (p_s_sb);
+ struct reiserfs_journal_desc *desc ;
+ struct reiserfs_journal_commit *commit ;
+ unsigned long trans_id = 0 ;
+ struct buffer_head *c_bh ;
+ struct buffer_head *d_bh ;
+ struct buffer_head **log_blocks = NULL ;
+ struct buffer_head **real_blocks = NULL ;
+ unsigned long trans_offset ;
+ int i;
+ int trans_half;
+
+ d_bh = journal_bread(p_s_sb, cur_dblock) ;
+ if (!d_bh)
+ return 1 ;
+ desc = (struct reiserfs_journal_desc *)d_bh->b_data ;
+ trans_offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) ;
+ reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1037: "
+ "journal_read_transaction, offset %llu, len %d mount_id %d",
+ d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb),
+ get_desc_trans_len(desc), get_desc_mount_id(desc)) ;
+ if (get_desc_trans_id(desc) < oldest_trans_id) {
+ reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1039: "
+ "journal_read_trans skipping because %lu is too old",
+ cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb)) ;
+ brelse(d_bh) ;
+ return 1 ;
+ }
+ if (get_desc_mount_id(desc) != newest_mount_id) {
+ reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1146: "
+ "journal_read_trans skipping because %d is != "
+ "newest_mount_id %lu", get_desc_mount_id(desc),
+ newest_mount_id) ;
+ brelse(d_bh) ;
+ return 1 ;
+ }
+ c_bh = journal_bread(p_s_sb, SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) +
+ ((trans_offset + get_desc_trans_len(desc) + 1) %
+ SB_ONDISK_JOURNAL_SIZE(p_s_sb))) ;
+ if (!c_bh) {
+ brelse(d_bh) ;
+ return 1 ;
+ }
+ commit = (struct reiserfs_journal_commit *)c_bh->b_data ;
+ if (journal_compare_desc_commit(p_s_sb, desc, commit)) {
+ reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal_read_transaction, "
+ "commit offset %llu had bad time %d or length %d",
+ c_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb),
+ get_commit_trans_id(commit), get_commit_trans_len(commit));
+ brelse(c_bh) ;
+ brelse(d_bh) ;
+ return 1;
+ }
+ trans_id = get_desc_trans_id(desc) ;
+ /* now we know we've got a good transaction, and it was inside the valid time ranges */
+ log_blocks = reiserfs_kmalloc(get_desc_trans_len(desc) * sizeof(struct buffer_head *), GFP_NOFS, p_s_sb) ;
+ real_blocks = reiserfs_kmalloc(get_desc_trans_len(desc) * sizeof(struct buffer_head *), GFP_NOFS, p_s_sb) ;
+ if (!log_blocks || !real_blocks) {
+ brelse(c_bh) ;
+ brelse(d_bh) ;
+ reiserfs_kfree(log_blocks, get_desc_trans_len(desc) * sizeof(struct buffer_head *), p_s_sb) ;
+ reiserfs_kfree(real_blocks, get_desc_trans_len(desc) * sizeof(struct buffer_head *), p_s_sb) ;
+ reiserfs_warning(p_s_sb, "journal-1169: kmalloc failed, unable to mount FS") ;
+ return -1 ;
+ }
+ /* get all the buffer heads */
+ trans_half = journal_trans_half (p_s_sb->s_blocksize) ;
+ for(i = 0 ; i < get_desc_trans_len(desc) ; i++) {
+ log_blocks[i] = journal_getblk(p_s_sb, SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) + (trans_offset + 1 + i) % SB_ONDISK_JOURNAL_SIZE(p_s_sb));
+ if (i < trans_half) {
+ real_blocks[i] = sb_getblk(p_s_sb, le32_to_cpu(desc->j_realblock[i])) ;
+ } else {
+ real_blocks[i] = sb_getblk(p_s_sb, le32_to_cpu(commit->j_realblock[i - trans_half])) ;
+ }
+ if ( real_blocks[i]->b_blocknr > SB_BLOCK_COUNT(p_s_sb) ) {
+ reiserfs_warning(p_s_sb, "journal-1207: REPLAY FAILURE fsck required! Block to replay is outside of filesystem");
+ goto abort_replay;
+ }
+ /* make sure we don't try to replay onto log or reserved area */
+ if (is_block_in_log_or_reserved_area(p_s_sb, real_blocks[i]->b_blocknr)) {
+ reiserfs_warning(p_s_sb, "journal-1204: REPLAY FAILURE fsck required! Trying to replay onto a log block") ;
+abort_replay:
+ brelse_array(log_blocks, i) ;
+ brelse_array(real_blocks, i) ;
+ brelse(c_bh) ;
+ brelse(d_bh) ;
+ reiserfs_kfree(log_blocks, get_desc_trans_len(desc) * sizeof(struct buffer_head *), p_s_sb) ;
+ reiserfs_kfree(real_blocks, get_desc_trans_len(desc) * sizeof(struct buffer_head *), p_s_sb) ;
+ return -1 ;
+ }
+ }
+ /* read in the log blocks, memcpy to the corresponding real block */
+ ll_rw_block(READ, get_desc_trans_len(desc), log_blocks) ;
+ for (i = 0 ; i < get_desc_trans_len(desc) ; i++) {
+ wait_on_buffer(log_blocks[i]) ;
+ if (!buffer_uptodate(log_blocks[i])) {
+ reiserfs_warning(p_s_sb, "journal-1212: REPLAY FAILURE fsck required! buffer write failed") ;
+ brelse_array(log_blocks + i, get_desc_trans_len(desc) - i) ;
+ brelse_array(real_blocks, get_desc_trans_len(desc)) ;
+ brelse(c_bh) ;
+ brelse(d_bh) ;
+ reiserfs_kfree(log_blocks, get_desc_trans_len(desc) * sizeof(struct buffer_head *), p_s_sb) ;
+ reiserfs_kfree(real_blocks, get_desc_trans_len(desc) * sizeof(struct buffer_head *), p_s_sb) ;
+ return -1 ;
+ }
+ memcpy(real_blocks[i]->b_data, log_blocks[i]->b_data, real_blocks[i]->b_size) ;
+ set_buffer_uptodate(real_blocks[i]) ;
+ brelse(log_blocks[i]) ;
+ }
+ /* flush out the real blocks */
+ for (i = 0 ; i < get_desc_trans_len(desc) ; i++) {
+ set_buffer_dirty(real_blocks[i]) ;
+ ll_rw_block(WRITE, 1, real_blocks + i) ;
+ }
+ for (i = 0 ; i < get_desc_trans_len(desc) ; i++) {
+ wait_on_buffer(real_blocks[i]) ;
+ if (!buffer_uptodate(real_blocks[i])) {
+ reiserfs_warning(p_s_sb, "journal-1226: REPLAY FAILURE, fsck required! buffer write failed") ;
+ brelse_array(real_blocks + i, get_desc_trans_len(desc) - i) ;
+ brelse(c_bh) ;
+ brelse(d_bh) ;
+ reiserfs_kfree(log_blocks, get_desc_trans_len(desc) * sizeof(struct buffer_head *), p_s_sb) ;
+ reiserfs_kfree(real_blocks, get_desc_trans_len(desc) * sizeof(struct buffer_head *), p_s_sb) ;
+ return -1 ;
+ }
+ brelse(real_blocks[i]) ;
+ }
+ cur_dblock = SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) + ((trans_offset + get_desc_trans_len(desc) + 2) % SB_ONDISK_JOURNAL_SIZE(p_s_sb)) ;
+ reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1095: setting journal "
+ "start to offset %ld",
+ cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb)) ;
+
+ /* 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(p_s_sb) ;
+ journal->j_last_flush_trans_id = trans_id ;
+ journal->j_trans_id = trans_id + 1;
+ brelse(c_bh) ;
+ brelse(d_bh) ;
+ reiserfs_kfree(log_blocks, le32_to_cpu(desc->j_len) * sizeof(struct buffer_head *), p_s_sb) ;
+ reiserfs_kfree(real_blocks, le32_to_cpu(desc->j_len) * sizeof(struct buffer_head *), p_s_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! */
+static struct buffer_head * reiserfs_breada (struct block_device *dev, int block, int bufsize,
+ unsigned int max_block)
+{
+ struct buffer_head * bhlist[BUFNR];
+ unsigned int blocks = BUFNR;
+ struct buffer_head * bh;
+ int i, j;
+
+ bh = __getblk (dev, block, bufsize );
+ if (buffer_uptodate (bh))
+ return (bh);
+
+ if (block + BUFNR > max_block) {
+ blocks = max_block - block;
+ }
+ bhlist[0] = bh;
+ j = 1;
+ for (i = 1; i < blocks; i++) {
+ bh = __getblk (dev, block + i, bufsize);
+ if (buffer_uptodate (bh)) {
+ brelse (bh);
+ break;
+ }
+ else bhlist[j++] = bh;
+ }
+ ll_rw_block (READ, j, bhlist);
+ for(i = 1; i < j; i++)
+ brelse (bhlist[i]);
+ bh = bhlist[0];
+ wait_on_buffer (bh);
+ if (buffer_uptodate (bh))
+ return bh;
+ brelse (bh);
+ return NULL;
+}
+
+/*
+** 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.
+*/
+static int journal_read(struct super_block *p_s_sb) {
+ struct reiserfs_journal *journal = SB_JOURNAL (p_s_sb);
+ struct reiserfs_journal_desc *desc ;
+ unsigned long oldest_trans_id = 0;
+ unsigned long oldest_invalid_trans_id = 0 ;
+ time_t start ;
+ unsigned long oldest_start = 0;
+ unsigned long cur_dblock = 0 ;
+ unsigned long newest_mount_id = 9 ;
+ struct buffer_head *d_bh ;
+ struct reiserfs_journal_header *jh ;
+ int valid_journal_header = 0 ;
+ int replay_count = 0 ;
+ int continue_replay = 1 ;
+ int ret ;
+ char b[BDEVNAME_SIZE];
+
+ cur_dblock = SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) ;
+ reiserfs_info (p_s_sb, "checking transaction log (%s)\n",
+ 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
+ */
+ journal->j_header_bh = journal_bread(p_s_sb,
+ SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) +
+ SB_ONDISK_JOURNAL_SIZE(p_s_sb));
+ if (!journal->j_header_bh) {
+ return 1 ;
+ }
+ jh = (struct reiserfs_journal_header *)(journal->j_header_bh->b_data) ;
+ if (le32_to_cpu(jh->j_first_unflushed_offset) >= 0 &&
+ le32_to_cpu(jh->j_first_unflushed_offset) < SB_ONDISK_JOURNAL_SIZE(p_s_sb) &&
+ le32_to_cpu(jh->j_last_flush_trans_id) > 0) {
+ oldest_start = SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) +
+ le32_to_cpu(jh->j_first_unflushed_offset) ;
+ oldest_trans_id = le32_to_cpu(jh->j_last_flush_trans_id) + 1;
+ newest_mount_id = le32_to_cpu(jh->j_mount_id);
+ reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1153: found in "
+ "header: first_unflushed_offset %d, last_flushed_trans_id "
+ "%lu", le32_to_cpu(jh->j_first_unflushed_offset),
+ 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.
+ */
+ d_bh = journal_bread(p_s_sb, SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) + le32_to_cpu(jh->j_first_unflushed_offset)) ;
+ ret = journal_transaction_is_valid(p_s_sb, d_bh, NULL, NULL) ;
+ if (!ret) {
+ continue_replay = 0 ;
+ }
+ brelse(d_bh) ;
+ goto start_log_replay;
+ }
+
+ if (continue_replay && bdev_read_only(p_s_sb->s_bdev)) {
+ reiserfs_warning (p_s_sb,
+ "clm-2076: device is readonly, unable to replay log") ;
+ return -1 ;
+ }
+
+ /* 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(p_s_sb) + SB_ONDISK_JOURNAL_SIZE(p_s_sb))) {
+ /* 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, p_s_sb->s_blocksize,
+ SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) + SB_ONDISK_JOURNAL_SIZE(p_s_sb)) ;
+ ret = journal_transaction_is_valid(p_s_sb, d_bh, &oldest_invalid_trans_id, &newest_mount_id) ;
+ if (ret == 1) {
+ desc = (struct reiserfs_journal_desc *)d_bh->b_data ;
+ if (oldest_start == 0) { /* init all oldest_ values */
+ oldest_trans_id = get_desc_trans_id(desc) ;
+ oldest_start = d_bh->b_blocknr ;
+ newest_mount_id = get_desc_mount_id(desc) ;
+ reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1179: Setting "
+ "oldest_start to offset %llu, trans_id %lu",
+ oldest_start - SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb),
+ oldest_trans_id) ;
+ } else if (oldest_trans_id > get_desc_trans_id(desc)) {
+ /* one we just read was older */
+ oldest_trans_id = get_desc_trans_id(desc) ;
+ oldest_start = d_bh->b_blocknr ;
+ reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1180: Resetting "
+ "oldest_start to offset %lu, trans_id %lu",
+ oldest_start - SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb),
+ oldest_trans_id) ;
+ }
+ if (newest_mount_id < get_desc_mount_id(desc)) {
+ newest_mount_id = get_desc_mount_id(desc) ;
+ reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1299: Setting "
+ "newest_mount_id to %d", get_desc_mount_id(desc));
+ }
+ cur_dblock += get_desc_trans_len(desc) + 2 ;
+ } else {
+ cur_dblock++ ;
+ }
+ brelse(d_bh) ;
+ }
+
+start_log_replay:
+ cur_dblock = oldest_start ;
+ if (oldest_trans_id) {
+ reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1206: Starting replay "
+ "from offset %llu, trans_id %lu",
+ cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb),
+ oldest_trans_id) ;
+
+ }
+ replay_count = 0 ;
+ while(continue_replay && oldest_trans_id > 0) {
+ ret = journal_read_transaction(p_s_sb, cur_dblock, oldest_start, oldest_trans_id, newest_mount_id) ;
+ if (ret < 0) {
+ return ret ;
+ } else if (ret != 0) {
+ break ;
+ }
+ cur_dblock = SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) + journal->j_start ;
+ replay_count++ ;
+ if (cur_dblock == oldest_start)
+ break;
+ }
+
+ if (oldest_trans_id == 0) {
+ reiserfs_debug(p_s_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
+ */
+ if (valid_journal_header && replay_count == 0) {
+ journal->j_start = le32_to_cpu(jh->j_first_unflushed_offset) ;
+ journal->j_trans_id = le32_to_cpu(jh->j_last_flush_trans_id) + 1;
+ journal->j_last_flush_trans_id = le32_to_cpu(jh->j_last_flush_trans_id) ;
+ journal->j_mount_id = le32_to_cpu(jh->j_mount_id) + 1;
+ } else {
+ journal->j_mount_id = newest_mount_id + 1 ;
+ }
+ reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1299: Setting "
+ "newest_mount_id to %lu", journal->j_mount_id) ;
+ journal->j_first_unflushed_offset = journal->j_start ;
+ if (replay_count > 0) {
+ reiserfs_info (p_s_sb, "replayed %d transactions in %lu seconds\n",
+ replay_count, get_seconds() - start) ;
+ }
+ if (!bdev_read_only(p_s_sb->s_bdev) &&
+ _update_journal_header_block(p_s_sb, journal->j_start,
+ journal->j_last_flush_trans_id))
+ {
+ /* replay failed, caller must call free_journal_ram and abort
+ ** the mount
+ */
+ return -1 ;
+ }
+ return 0 ;
+}
+
+static struct reiserfs_journal_list *alloc_journal_list(struct super_block *s)
+{
+ struct reiserfs_journal_list *jl;
+retry:
+ jl = reiserfs_kmalloc(sizeof(struct reiserfs_journal_list), GFP_NOFS, s);
+ if (!jl) {
+ yield();
+ goto retry;
+ }
+ memset(jl, 0, sizeof(*jl));
+ INIT_LIST_HEAD(&jl->j_list);
+ INIT_LIST_HEAD(&jl->j_working_list);
+ INIT_LIST_HEAD(&jl->j_tail_bh_list);
+ INIT_LIST_HEAD(&jl->j_bh_list);
+ sema_init(&jl->j_commit_lock, 1);
+ SB_JOURNAL(s)->j_num_lists++;
+ get_journal_list(jl);
+ return jl;
+}
+
+static void journal_list_init(struct super_block *p_s_sb) {
+ SB_JOURNAL(p_s_sb)->j_current_jl = alloc_journal_list(p_s_sb);
+}
+
+static int release_journal_dev( struct super_block *super,
+ struct reiserfs_journal *journal )
+{
+ int result;
+
+ result = 0;
+
+ if( journal -> j_dev_file != NULL ) {
+ result = filp_close( journal -> j_dev_file, NULL );
+ journal -> j_dev_file = NULL;
+ journal -> j_dev_bd = NULL;
+ } else if( journal -> j_dev_bd != NULL ) {
+ result = blkdev_put( journal -> j_dev_bd );
+ journal -> j_dev_bd = NULL;
+ }
+
+ if( result != 0 ) {
+ reiserfs_warning(super, "sh-457: release_journal_dev: Cannot release journal device: %i", result );
+ }
+ return result;
+}
+
+static int journal_init_dev( struct super_block *super,
+ struct reiserfs_journal *journal,
+ const char *jdev_name )
+{
+ int result;
+ dev_t jdev;
+ int blkdev_mode = FMODE_READ | FMODE_WRITE;
+ char b[BDEVNAME_SIZE];
+
+ result = 0;
+
+ journal -> j_dev_bd = NULL;
+ journal -> j_dev_file = NULL;
+ jdev = SB_ONDISK_JOURNAL_DEVICE( super ) ?
+ new_decode_dev(SB_ONDISK_JOURNAL_DEVICE(super)) : super->s_dev;
+
+ if (bdev_read_only(super->s_bdev))
+ blkdev_mode = FMODE_READ;
+
+ /* there is no "jdev" option and journal is on separate device */
+ if( ( !jdev_name || !jdev_name[ 0 ] ) ) {
+ journal->j_dev_bd = open_by_devnum(jdev, blkdev_mode);
+ if (IS_ERR(journal->j_dev_bd)) {
+ result = PTR_ERR(journal->j_dev_bd);
+ journal->j_dev_bd = NULL;
+ reiserfs_warning (super, "sh-458: journal_init_dev: "
+ "cannot init journal device '%s': %i",
+ __bdevname(jdev, b), result );
+ return result;
+ } else if (jdev != super->s_dev)
+ set_blocksize(journal->j_dev_bd, super->s_blocksize);
+ return 0;
+ }
+
+ journal -> j_dev_file = filp_open( jdev_name, 0, 0 );
+ if( !IS_ERR( journal -> j_dev_file ) ) {
+ struct inode *jdev_inode = journal->j_dev_file->f_mapping->host;
+ if( !S_ISBLK( jdev_inode -> i_mode ) ) {
+ reiserfs_warning (super, "journal_init_dev: '%s' is "
+ "not a block device", jdev_name );
+ result = -ENOTBLK;
+ } else {
+ /* ok */
+ journal->j_dev_bd = I_BDEV(jdev_inode);
+ set_blocksize(journal->j_dev_bd, super->s_blocksize);
+ }
+ } else {
+ result = PTR_ERR( journal -> j_dev_file );
+ journal -> j_dev_file = NULL;
+ reiserfs_warning (super,
+ "journal_init_dev: Cannot open '%s': %i",
+ jdev_name, result );
+ }
+ if( result != 0 ) {
+ release_journal_dev( super, journal );
+ }
+ reiserfs_info(super, "journal_init_dev: journal device: %s\n",
+ bdevname(journal->j_dev_bd, b));
+ return result;
+}
+
+/*
+** must be called once on fs mount. calls journal_read for you
+*/
+int journal_init(struct super_block *p_s_sb, const char * j_dev_name, int old_format, unsigned int commit_max_age) {
+ int num_cnodes = SB_ONDISK_JOURNAL_SIZE(p_s_sb) * 2 ;
+ struct buffer_head *bhjh;
+ struct reiserfs_super_block * rs;
+ struct reiserfs_journal_header *jh;
+ struct reiserfs_journal *journal;
+ struct reiserfs_journal_list *jl;
+ char b[BDEVNAME_SIZE];
+
+ journal = SB_JOURNAL(p_s_sb) = vmalloc(sizeof (struct reiserfs_journal)) ;
+ if (!journal) {
+ reiserfs_warning (p_s_sb, "journal-1256: unable to get memory for journal structure") ;
+ return 1 ;
+ }
+ memset(journal, 0, sizeof(struct reiserfs_journal)) ;
+ INIT_LIST_HEAD(&journal->j_bitmap_nodes) ;
+ INIT_LIST_HEAD (&journal->j_prealloc_list);
+ INIT_LIST_HEAD(&journal->j_working_list);
+ INIT_LIST_HEAD(&journal->j_journal_list);
+ journal->j_persistent_trans = 0;
+ if (reiserfs_allocate_list_bitmaps(p_s_sb,
+ journal->j_list_bitmap,
+ SB_BMAP_NR(p_s_sb)))
+ goto free_and_return ;
+ allocate_bitmap_nodes(p_s_sb) ;
+
+ /* reserved for journal area support */
+ SB_JOURNAL_1st_RESERVED_BLOCK(p_s_sb) = (old_format ?
+ REISERFS_OLD_DISK_OFFSET_IN_BYTES / p_s_sb->s_blocksize +
+ SB_BMAP_NR(p_s_sb) + 1 :
+ REISERFS_DISK_OFFSET_IN_BYTES / p_s_sb->s_blocksize + 2);
+
+ /* Sanity check to see is the standard journal fitting withing first bitmap
+ (actual for small blocksizes) */
+ if ( !SB_ONDISK_JOURNAL_DEVICE( p_s_sb ) &&
+ (SB_JOURNAL_1st_RESERVED_BLOCK(p_s_sb) + SB_ONDISK_JOURNAL_SIZE(p_s_sb) > p_s_sb->s_blocksize * 8) ) {
+ reiserfs_warning (p_s_sb, "journal-1393: journal does not fit for area "
+ "addressed by first of bitmap blocks. It starts at "
+ "%u and its size is %u. Block size %ld",
+ SB_JOURNAL_1st_RESERVED_BLOCK(p_s_sb),
+ SB_ONDISK_JOURNAL_SIZE(p_s_sb), p_s_sb->s_blocksize);
+ goto free_and_return;
+ }
+
+ if( journal_init_dev( p_s_sb, journal, j_dev_name ) != 0 ) {
+ reiserfs_warning (p_s_sb, "sh-462: unable to initialize jornal device");
+ goto free_and_return;
+ }
+
+ rs = SB_DISK_SUPER_BLOCK(p_s_sb);
+
+ /* read journal header */
+ bhjh = journal_bread(p_s_sb,
+ SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) + SB_ONDISK_JOURNAL_SIZE(p_s_sb));
+ if (!bhjh) {
+ reiserfs_warning (p_s_sb, "sh-459: unable to read journal header");
+ goto free_and_return;
+ }
+ jh = (struct reiserfs_journal_header *)(bhjh->b_data);
+
+ /* make sure that journal matches to the super block */
+ if (is_reiserfs_jr(rs) && (jh->jh_journal.jp_journal_magic != sb_jp_journal_magic(rs))) {
+ reiserfs_warning (p_s_sb, "sh-460: journal header magic %x "
+ "(device %s) does not match to magic found in super "
+ "block %x",
+ jh->jh_journal.jp_journal_magic,
+ bdevname( journal->j_dev_bd, b),
+ sb_jp_journal_magic(rs));
+ brelse (bhjh);
+ goto free_and_return;
+ }
+
+ journal->j_trans_max = le32_to_cpu (jh->jh_journal.jp_journal_trans_max);
+ journal->j_max_batch = le32_to_cpu (jh->jh_journal.jp_journal_max_batch);
+ journal->j_max_commit_age = le32_to_cpu (jh->jh_journal.jp_journal_max_commit_age);
+ journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
+
+ if (journal->j_trans_max) {
+ /* make sure these parameters are available, assign it if they are not */
+ __u32 initial = journal->j_trans_max;
+ __u32 ratio = 1;
+
+ if (p_s_sb->s_blocksize < 4096)
+ ratio = 4096 / p_s_sb->s_blocksize;
+
+ if (SB_ONDISK_JOURNAL_SIZE(p_s_sb)/journal->j_trans_max < JOURNAL_MIN_RATIO)
+ journal->j_trans_max = SB_ONDISK_JOURNAL_SIZE(p_s_sb) / JOURNAL_MIN_RATIO;
+ if (journal->j_trans_max > JOURNAL_TRANS_MAX_DEFAULT / ratio)
+ journal->j_trans_max = JOURNAL_TRANS_MAX_DEFAULT / ratio;
+ if (journal->j_trans_max < JOURNAL_TRANS_MIN_DEFAULT / ratio)
+ journal->j_trans_max = JOURNAL_TRANS_MIN_DEFAULT / ratio;
+
+ if (journal->j_trans_max != initial)
+ reiserfs_warning (p_s_sb, "sh-461: journal_init: wrong transaction max size (%u). Changed to %u",
+ initial, journal->j_trans_max);
+
+ journal->j_max_batch = journal->j_trans_max*
+ JOURNAL_MAX_BATCH_DEFAULT/JOURNAL_TRANS_MAX_DEFAULT;
+ }
+
+ if (!journal->j_trans_max) {
+ /*we have the file system was created by old version of mkreiserfs
+ so this field contains zero value */
+ journal->j_trans_max = JOURNAL_TRANS_MAX_DEFAULT ;
+ journal->j_max_batch = JOURNAL_MAX_BATCH_DEFAULT ;
+ journal->j_max_commit_age = JOURNAL_MAX_COMMIT_AGE ;
+
+ /* for blocksize >= 4096 - max transaction size is 1024. For block size < 4096
+ trans max size is decreased proportionally */
+ if (p_s_sb->s_blocksize < 4096) {
+ journal->j_trans_max /= (4096 / p_s_sb->s_blocksize) ;
+ journal->j_max_batch = (journal->j_trans_max) * 9 / 10 ;
+ }
+ }
+
+ journal->j_default_max_commit_age = journal->j_max_commit_age;
+
+ if (commit_max_age != 0) {
+ journal->j_max_commit_age = commit_max_age;
+ journal->j_max_trans_age = commit_max_age;
+ }
+
+ reiserfs_info (p_s_sb, "journal params: device %s, size %u, "
+ "journal first block %u, max trans len %u, max batch %u, "
+ "max commit age %u, max trans age %u\n",
+ bdevname( journal->j_dev_bd, b),
+ SB_ONDISK_JOURNAL_SIZE(p_s_sb),
+ SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb),
+ journal->j_trans_max,
+ journal->j_max_batch,
+ journal->j_max_commit_age,
+ journal->j_max_trans_age);
+
+ brelse (bhjh);
+
+ journal->j_list_bitmap_index = 0 ;
+ journal_list_init(p_s_sb) ;
+
+ memset(journal->j_list_hash_table, 0, JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *)) ;
+
+ INIT_LIST_HEAD(&journal->j_dirty_buffers) ;
+ spin_lock_init(&journal->j_dirty_buffers_lock) ;
+
+ journal->j_start = 0 ;
+ journal->j_len = 0 ;
+ journal->j_len_alloc = 0 ;
+ atomic_set(&(journal->j_wcount), 0) ;
+ atomic_set(&(journal->j_async_throttle), 0) ;
+ journal->j_bcount = 0 ;
+ journal->j_trans_start_time = 0 ;
+ journal->j_last = NULL ;
+ journal->j_first = NULL ;
+ init_waitqueue_head(&(journal->j_join_wait)) ;
+ sema_init(&journal->j_lock, 1);
+ sema_init(&journal->j_flush_sem, 1);
+
+ journal->j_trans_id = 10 ;
+ journal->j_mount_id = 10 ;
+ journal->j_state = 0 ;
+ atomic_set(&(journal->j_jlock), 0) ;
+ journal->j_cnode_free_list = allocate_cnodes(num_cnodes) ;
+ journal->j_cnode_free_orig = journal->j_cnode_free_list ;
+ journal->j_cnode_free = journal->j_cnode_free_list ? num_cnodes : 0 ;
+ journal->j_cnode_used = 0 ;
+ journal->j_must_wait = 0 ;
+
+ init_journal_hash(p_s_sb) ;
+ jl = journal->j_current_jl;
+ jl->j_list_bitmap = get_list_bitmap(p_s_sb, jl);
+ if (!jl->j_list_bitmap) {
+ reiserfs_warning(p_s_sb, "journal-2005, get_list_bitmap failed for journal list 0") ;
+ goto free_and_return;
+ }
+ if (journal_read(p_s_sb) < 0) {
+ reiserfs_warning(p_s_sb, "Replay Failure, unable to mount") ;
+ goto free_and_return;
+ }
+
+ reiserfs_mounted_fs_count++ ;
+ if (reiserfs_mounted_fs_count <= 1)
+ commit_wq = create_workqueue("reiserfs");
+
+ INIT_WORK(&journal->j_work, flush_async_commits, p_s_sb);
+ return 0 ;
+free_and_return:
+ free_journal_ram(p_s_sb);
+ return 1;
+}
+
+/*
+** 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) {
+ struct reiserfs_journal *journal = SB_JOURNAL (th->t_super);
+ time_t now = get_seconds() ;
+ /* cannot restart while nested */
+ BUG_ON (!th->t_trans_id);
+ if (th->t_refcount > 1)
+ return 0 ;
+ if ( journal->j_must_wait > 0 ||
+ (journal->j_len_alloc + new_alloc) >= journal->j_max_batch ||
+ atomic_read(&(journal->j_jlock)) ||
+ (now - journal->j_trans_start_time) > journal->j_max_trans_age ||
+ journal->j_cnode_free < (journal->j_trans_max * 3)) {
+ return 1 ;
+ }
+ return 0 ;
+}
+
+/* this must be called inside a transaction, and requires the
+** kernel_lock to be held
+*/
+void reiserfs_block_writes(struct reiserfs_transaction_handle *th) {
+ struct reiserfs_journal *journal = SB_JOURNAL (th->t_super);
+ BUG_ON (!th->t_trans_id);
+ journal->j_must_wait = 1 ;
+ set_bit(J_WRITERS_BLOCKED, &journal->j_state) ;
+ return ;
+}
+
+/* this must be called without a transaction started, and does not
+** require BKL
+*/
+void reiserfs_allow_writes(struct super_block *s) {
+ struct reiserfs_journal *journal = SB_JOURNAL (s);
+ clear_bit(J_WRITERS_BLOCKED, &journal->j_state) ;
+ wake_up(&journal->j_join_wait) ;
+}
+
+/* this must be called without a transaction started, and does not
+** require BKL
+*/
+void reiserfs_wait_on_write_block(struct super_block *s) {
+ struct reiserfs_journal *journal = SB_JOURNAL (s);
+ wait_event(journal->j_join_wait,
+ !test_bit(J_WRITERS_BLOCKED, &journal->j_state)) ;
+}
+
+static void queue_log_writer(struct super_block *s) {
+ wait_queue_t wait;
+ struct reiserfs_journal *journal = SB_JOURNAL (s);
+ set_bit(J_WRITERS_QUEUED, &journal->j_state);
+
+ /*
+ * we don't want to use wait_event here because
+ * we only want to wait once.
+ */
+ init_waitqueue_entry(&wait, current);
+ add_wait_queue(&journal->j_join_wait, &wait);
+ set_current_state(TASK_UNINTERRUPTIBLE);
+ if (test_bit(J_WRITERS_QUEUED, &journal->j_state))
+ schedule();
+ current->state = TASK_RUNNING;
+ remove_wait_queue(&journal->j_join_wait, &wait);
+}
+
+static void wake_queued_writers(struct super_block *s) {
+ struct reiserfs_journal *journal = SB_JOURNAL (s);
+ if (test_and_clear_bit(J_WRITERS_QUEUED, &journal->j_state))
+ wake_up(&journal->j_join_wait);
+}
+
+static void let_transaction_grow(struct super_block *sb,
+ unsigned long trans_id)
+{
+ struct reiserfs_journal *journal = SB_JOURNAL (sb);
+ unsigned long bcount = journal->j_bcount;
+ while(1) {
+ set_current_state(TASK_UNINTERRUPTIBLE);
+ schedule_timeout(1);
+ journal->j_current_jl->j_state |= LIST_COMMIT_PENDING;
+ while ((atomic_read(&journal->j_wcount) > 0 ||
+ atomic_read(&journal->j_jlock)) &&
+ journal->j_trans_id == trans_id) {
+ queue_log_writer(sb);
+ }
+ if (journal->j_trans_id != trans_id)
+ break;
+ if (bcount == journal->j_bcount)
+ break;
+ bcount = journal->j_bcount;
+ }
+}
+
+/* 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 * p_s_sb,unsigned long nblocks,int join) {
+ time_t now = get_seconds() ;
+ int old_trans_id ;
+ struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
+ struct reiserfs_transaction_handle myth;
+ int sched_count = 0;
+ int retval;
+
+ reiserfs_check_lock_depth(p_s_sb, "journal_begin") ;
+
+ PROC_INFO_INC( p_s_sb, journal.journal_being );
+ /* set here for journal_join */
+ th->t_refcount = 1;
+ th->t_super = p_s_sb ;
+
+relock:
+ lock_journal(p_s_sb) ;
+ if (join != JBEGIN_ABORT && reiserfs_is_journal_aborted (journal)) {
+ unlock_journal (p_s_sb);
+ retval = journal->j_errno;
+ goto out_fail;
+ }
+ journal->j_bcount++;
+
+ if (test_bit(J_WRITERS_BLOCKED, &journal->j_state)) {
+ unlock_journal(p_s_sb) ;
+ reiserfs_wait_on_write_block(p_s_sb) ;
+ PROC_INFO_INC( p_s_sb, journal.journal_relock_writers );
+ goto relock ;
+ }
+ 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 ( (!join && journal->j_must_wait > 0) ||
+ ( !join && (journal->j_len_alloc + nblocks + 2) >= journal->j_max_batch) ||
+ (!join && atomic_read(&journal->j_wcount) > 0 && journal->j_trans_start_time > 0 &&
+ (now - journal->j_trans_start_time) > journal->j_max_trans_age) ||
+ (!join && atomic_read(&journal->j_jlock)) ||
+ (!join && journal->j_cnode_free < (journal->j_trans_max * 3))) {
+
+ old_trans_id = journal->j_trans_id;
+ unlock_journal(p_s_sb) ; /* allow others to finish this transaction */
+
+ if (!join && (journal->j_len_alloc + nblocks + 2) >=
+ journal->j_max_batch &&
+ ((journal->j_len + nblocks + 2) * 100) < (journal->j_len_alloc * 75))
+ {
+ if (atomic_read(&journal->j_wcount) > 10) {
+ sched_count++;
+ queue_log_writer(p_s_sb);
+ goto relock;
+ }
+ }
+ /* 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 &&
+ atomic_read(&journal->j_jlock)) {
+ queue_log_writer(p_s_sb);
+ }
+ goto relock;
+ }
+ retval = journal_join(&myth, p_s_sb, 1) ;
+ if (retval)
+ goto out_fail;
+
+ /* someone might have ended the transaction while we joined */
+ if (old_trans_id != journal->j_trans_id) {
+ retval = do_journal_end(&myth, p_s_sb, 1, 0) ;
+ } else {
+ retval = do_journal_end(&myth, p_s_sb, 1, COMMIT_NOW) ;
+ }
+
+ if (retval)
+ goto out_fail;
+
+ PROC_INFO_INC( p_s_sb, journal.journal_relock_wcount );
+ goto relock ;
+ }
+ /* we are the first writer, set trans_id */
+ if (journal->j_trans_start_time == 0) {
+ journal->j_trans_start_time = get_seconds();
+ }
+ atomic_inc(&(journal->j_wcount)) ;
+ journal->j_len_alloc += nblocks ;
+ th->t_blocks_logged = 0 ;
+ th->t_blocks_allocated = nblocks ;
+ th->t_trans_id = journal->j_trans_id ;
+ unlock_journal(p_s_sb) ;
+ INIT_LIST_HEAD (&th->t_list);
+ return 0 ;
+
+out_fail:
+ memset (th, 0, sizeof (*th));
+ /* 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 */
+ th->t_super = p_s_sb;
+ return retval;
+}
+
+struct reiserfs_transaction_handle *
+reiserfs_persistent_transaction(struct super_block *s, int nblocks) {
+ int ret ;
+ struct reiserfs_transaction_handle *th ;
+
+ /* 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++ ;
+ if (th->t_refcount < 2) {
+ BUG() ;
+ }
+ return th ;
+ }
+ th = reiserfs_kmalloc(sizeof(struct reiserfs_transaction_handle), GFP_NOFS, s) ;
+ if (!th)
+ return NULL;
+ ret = journal_begin(th, s, nblocks) ;
+ if (ret) {
+ reiserfs_kfree(th, sizeof(struct reiserfs_transaction_handle), s) ;
+ return NULL;
+ }
+
+ SB_JOURNAL(s)->j_persistent_trans++;
+ return th ;
+}
+
+int
+reiserfs_end_persistent_transaction(struct reiserfs_transaction_handle *th) {
+ struct super_block *s = th->t_super;
+ int ret = 0;
+ if (th->t_trans_id)
+ ret = journal_end(th, th->t_super, th->t_blocks_allocated);
+ else
+ ret = -EIO;
+ if (th->t_refcount == 0) {
+ SB_JOURNAL(s)->j_persistent_trans--;
+ reiserfs_kfree(th, sizeof(struct reiserfs_transaction_handle), s) ;
+ }
+ return ret;
+}
+
+static int journal_join(struct reiserfs_transaction_handle *th, struct super_block *p_s_sb, unsigned long nblocks) {
+ struct reiserfs_transaction_handle *cur_th = current->journal_info;
+
+ /* this keeps do_journal_end from NULLing out the current->journal_info
+ ** pointer
+ */
+ th->t_handle_save = cur_th ;
+ if (cur_th && cur_th->t_refcount > 1) {
+ BUG() ;
+ }
+ return do_journal_begin_r(th, p_s_sb, nblocks, JBEGIN_JOIN) ;
+}
+
+int journal_join_abort(struct reiserfs_transaction_handle *th, struct super_block *p_s_sb, unsigned long nblocks) {
+ struct reiserfs_transaction_handle *cur_th = current->journal_info;
+
+ /* this keeps do_journal_end from NULLing out the current->journal_info
+ ** pointer
+ */
+ th->t_handle_save = cur_th ;
+ if (cur_th && cur_th->t_refcount > 1) {
+ BUG() ;
+ }
+ return do_journal_begin_r(th, p_s_sb, nblocks, JBEGIN_ABORT) ;
+}
+
+int journal_begin(struct reiserfs_transaction_handle *th, struct super_block * p_s_sb, unsigned long nblocks) {
+ struct reiserfs_transaction_handle *cur_th = current->journal_info ;
+ int ret ;
+
+ th->t_handle_save = NULL ;
+ if (cur_th) {
+ /* we are nesting into the current transaction */
+ if (cur_th->t_super == p_s_sb) {
+ BUG_ON (!cur_th->t_refcount);
+ cur_th->t_refcount++ ;
+ memcpy(th, cur_th, sizeof(*th));
+ if (th->t_refcount <= 1)
+ reiserfs_warning (p_s_sb, "BAD: refcount <= 1, but 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...
+ */
+ reiserfs_warning(p_s_sb, "clm-2100: nesting info a different FS") ;
+ th->t_handle_save = current->journal_info ;
+ current->journal_info = th;
+ }
+ } else {
+ current->journal_info = th;
+ }
+ ret = do_journal_begin_r(th, p_s_sb, nblocks, JBEGIN_REG) ;
+ if (current->journal_info != th)
+ BUG() ;
+
+ /* 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
+ BUG_ON (!th->t_refcount);
+
+ return ret ;
+}
+
+/*
+** 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 *p_s_sb, struct buffer_head *bh) {
+ struct reiserfs_journal *journal = SB_JOURNAL (p_s_sb);
+ struct reiserfs_journal_cnode *cn = NULL;
+ int count_already_incd = 0 ;
+ int prepared = 0 ;
+ BUG_ON (!th->t_trans_id);
+
+ PROC_INFO_INC( p_s_sb, journal.mark_dirty );
+ if (th->t_trans_id != journal->j_trans_id) {
+ reiserfs_panic(th->t_super, "journal-1577: handle trans id %ld != current trans id %ld\n",
+ th->t_trans_id, journal->j_trans_id);
+ }
+
+ p_s_sb->s_dirt = 1;
+
+ prepared = test_clear_buffer_journal_prepared (bh);
+ clear_buffer_journal_restore_dirty (bh);
+ /* already in this transaction, we are done */
+ if (buffer_journaled(bh)) {
+ PROC_INFO_INC( p_s_sb, journal.mark_dirty_already );
+ 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.
+ */
+ if (!prepared || buffer_dirty(bh)) {
+ reiserfs_warning (p_s_sb, "journal-1777: buffer %llu bad state "
+ "%cPREPARED %cLOCKED %cDIRTY %cJDIRTY_WAIT",
+ (unsigned long long)bh->b_blocknr, prepared ? ' ' : '!',
+ buffer_locked(bh) ? ' ' : '!',
+ buffer_dirty(bh) ? ' ' : '!',
+ buffer_journal_dirty(bh) ? ' ' : '!') ;
+ }
+
+ if (atomic_read(&(journal->j_wcount)) <= 0) {
+ reiserfs_warning (p_s_sb, "journal-1409: journal_mark_dirty returning because j_wcount was %d", 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.
+ */
+ if (journal->j_len >= journal->j_trans_max) {
+ reiserfs_panic(th->t_super, "journal-1413: journal_mark_dirty: j_len (%lu) is too big\n", journal->j_len) ;
+ }
+
+ if (buffer_journal_dirty(bh)) {
+ count_already_incd = 1 ;
+ PROC_INFO_INC( p_s_sb, journal.mark_dirty_notjournal );
+ clear_buffer_journal_dirty (bh);
+ }
+
+ if (journal->j_len > journal->j_len_alloc) {
+ journal->j_len_alloc = journal->j_len + JOURNAL_PER_BALANCE_CNT ;
+ }
+
+ set_buffer_journaled (bh);
+
+ /* now put this guy on the end */
+ if (!cn) {
+ cn = get_cnode(p_s_sb) ;
+ if (!cn) {
+ reiserfs_panic(p_s_sb, "get_cnode failed!\n");
+ }
+
+ if (th->t_blocks_logged == th->t_blocks_allocated) {
+ th->t_blocks_allocated += JOURNAL_PER_BALANCE_CNT ;
+ journal->j_len_alloc += JOURNAL_PER_BALANCE_CNT ;
+ }
+ th->t_blocks_logged++ ;
+ journal->j_len++ ;
+
+ cn->bh = bh ;
+ cn->blocknr = bh->b_blocknr ;
+ cn->sb = p_s_sb;
+ cn->jlist = NULL ;
+ insert_journal_hash(journal->j_hash_table, cn) ;
+ if (!count_already_incd) {
+ get_bh(bh) ;
+ }
+ }
+ cn->next = NULL ;
+ cn->prev = journal->j_last ;
+ cn->bh = bh ;
+ if (journal->j_last) {
+ journal->j_last->next = cn ;
+ journal->j_last = cn ;
+ } else {
+ journal->j_first = cn ;
+ journal->j_last = cn ;
+ }
+ return 0 ;
+}
+
+int journal_end(struct reiserfs_transaction_handle *th, struct super_block *p_s_sb, unsigned long nblocks) {
+ if (!current->journal_info && th->t_refcount > 1)
+ reiserfs_warning (p_s_sb, "REISER-NESTING: th NULL, refcount %d",
+ th->t_refcount);
+
+ if (!th->t_trans_id) {
+ WARN_ON (1);
+ return -EIO;
+ }
+
+ th->t_refcount--;
+ if (th->t_refcount > 0) {
+ 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
+ */
+ if (cur_th->t_super != th->t_super)
+ BUG() ;
+
+ if (th != cur_th) {
+ memcpy(current->journal_info, th, sizeof(*th));
+ th->t_trans_id = 0;
+ }
+ return 0;
+ } else {
+ return do_journal_end(th, p_s_sb, nblocks, 0) ;
+ }
+}
+
+/* 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 *p_s_sb, b_blocknr_t blocknr, int already_cleaned) {
+ struct buffer_head *bh ;
+ struct reiserfs_journal_cnode *cn ;
+ struct reiserfs_journal *journal = SB_JOURNAL (p_s_sb);
+ int ret = 0;
+
+ cn = get_journal_hash_dev(p_s_sb, journal->j_hash_table, blocknr) ;
+ if (!cn || !cn->bh) {
+ return ret ;
+ }
+ bh = cn->bh ;
+ if (cn->prev) {
+ cn->prev->next = cn->next ;
+ }
+ if (cn->next) {
+ cn->next->prev = cn->prev ;
+ }
+ if (cn == journal->j_first) {
+ journal->j_first = cn->next ;
+ }
+ if (cn == journal->j_last) {
+ journal->j_last = cn->prev ;
+ }
+ if (bh)
+ remove_journal_hash(p_s_sb, journal->j_hash_table, NULL, bh->b_blocknr, 0) ;
+ clear_buffer_journaled (bh); /* don't log this one */
+
+ if (!already_cleaned) {
+ clear_buffer_journal_dirty (bh);
+ clear_buffer_dirty(bh);
+ clear_buffer_journal_test (bh);
+ put_bh(bh) ;
+ if (atomic_read(&(bh->b_count)) < 0) {
+ reiserfs_warning (p_s_sb, "journal-1752: remove from trans, b_count < 0");
+ }
+ ret = 1 ;
+ }
+ journal->j_len-- ;
+ journal->j_len_alloc-- ;
+ free_cnode(p_s_sb, cn) ;
+ return ret ;
+}
+
+/*
+** for any cnode in a journal list, it can only be dirtied of all the
+** transactions that include it are commited 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;
+ b_blocknr_t blocknr = cn->blocknr ;
+ 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.
+ */
+ while(cur && can_dirty) {
+ if (cur->jlist && cur->bh && cur->blocknr && cur->sb == sb &&
+ cur->blocknr == blocknr) {
+ can_dirty = 0 ;
+ }
+ 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
+ */
+ cur = cn->hnext ;
+ while(cur && can_dirty) {
+ if (cur->jlist && cur->jlist->j_len > 0 &&
+ atomic_read(&(cur->jlist->j_commit_left)) > 0 && cur->bh &&
+ cur->blocknr && cur->sb == sb && cur->blocknr == blocknr) {
+ can_dirty = 0 ;
+ }
+ cur = cur->hnext ;
+ }
+ return can_dirty ;
+}
+
+/* syncs the commit blocks, but does not force the real buffers to disk
+** will wait until the current transaction is done/commited before returning
+*/
+int journal_end_sync(struct reiserfs_transaction_handle *th, struct super_block *p_s_sb, unsigned long nblocks) {
+ struct reiserfs_journal *journal = SB_JOURNAL (p_s_sb);
+
+ BUG_ON (!th->t_trans_id);
+ /* you can sync while nested, very, very bad */
+ if (th->t_refcount > 1) {
+ BUG() ;
+ }
+ if (journal->j_len == 0) {
+ reiserfs_prepare_for_journal(p_s_sb, SB_BUFFER_WITH_SB(p_s_sb), 1) ;
+ journal_mark_dirty(th, p_s_sb, SB_BUFFER_WITH_SB(p_s_sb)) ;
+ }
+ return do_journal_end(th, p_s_sb, nblocks, COMMIT_NOW | WAIT) ;
+}
+
+/*
+** writeback the pending async commits to disk
+*/
+static void flush_async_commits(void *p) {
+ struct super_block *p_s_sb = p;
+ struct reiserfs_journal *journal = SB_JOURNAL (p_s_sb);
+ struct reiserfs_journal_list *jl;
+ struct list_head *entry;
+
+ lock_kernel();
+ if (!list_empty(&journal->j_journal_list)) {
+ /* last entry is the youngest, commit it and you get everything */
+ entry = journal->j_journal_list.prev;
+ jl = JOURNAL_LIST_ENTRY(entry);
+ flush_commit_list(p_s_sb, jl, 1);
+ }
+ unlock_kernel();
+ /*
+ * this is a little racey, but there's no harm in missing
+ * the filemap_fdata_write
+ */
+ if (!atomic_read(&journal->j_async_throttle) && !reiserfs_is_journal_aborted (journal)) {
+ atomic_inc(&journal->j_async_throttle);
+ filemap_fdatawrite(p_s_sb->s_bdev->bd_inode->i_mapping);
+ atomic_dec(&journal->j_async_throttle);
+ }
+}
+
+/*
+** flushes any old transactions to disk
+** ends the current transaction if it is too old
+*/
+int reiserfs_flush_old_commits(struct super_block *p_s_sb) {
+ time_t now ;
+ struct reiserfs_transaction_handle th ;
+ struct reiserfs_journal *journal = SB_JOURNAL (p_s_sb);
+
+ now = get_seconds();
+ /* safety check so we don't flush while we are replaying the log during
+ * mount
+ */
+ if (list_empty(&journal->j_journal_list)) {
+ return 0 ;
+ }
+
+ /* 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 &&
+ journal->j_trans_start_time > 0 &&
+ journal->j_len > 0 &&
+ (now - journal->j_trans_start_time) > journal->j_max_trans_age)
+ {
+ if (!journal_join(&th, p_s_sb, 1)) {
+ reiserfs_prepare_for_journal(p_s_sb, SB_BUFFER_WITH_SB(p_s_sb), 1) ;
+ journal_mark_dirty(&th, p_s_sb, SB_BUFFER_WITH_SB(p_s_sb)) ;
+
+ /* 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, p_s_sb,1, COMMIT_NOW | WAIT) ;
+ }
+ }
+ return p_s_sb->s_dirt;
+}
+
+/*
+** 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 * p_s_sb,
+ unsigned long nblocks, int flags) {
+
+ time_t now ;
+ int flush = flags & FLUSH_ALL ;
+ int commit_now = flags & COMMIT_NOW ;
+ int wait_on_commit = flags & WAIT ;
+ struct reiserfs_journal_list *jl;
+ struct reiserfs_journal *journal = SB_JOURNAL (p_s_sb);
+
+ BUG_ON (!th->t_trans_id);
+
+ if (th->t_trans_id != journal->j_trans_id) {
+ reiserfs_panic(th->t_super, "journal-1577: handle trans id %ld != current trans id %ld\n",
+ th->t_trans_id, journal->j_trans_id);
+ }
+
+ 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 */
+ 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
+ */
+ if (journal->j_len == 0) {
+ BUG();
+ }
+ /* 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) {
+ unsigned trans_id ;
+
+ jl = journal->j_current_jl;
+ trans_id = jl->j_trans_id;
+ if (wait_on_commit)
+ jl->j_state |= LIST_COMMIT_PENDING;
+ atomic_set(&(journal->j_jlock), 1) ;
+ if (flush) {
+ journal->j_next_full_flush = 1 ;
+ }
+ unlock_journal(p_s_sb) ;
+
+ /* 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(p_s_sb);
+ } else {
+ lock_journal(p_s_sb);
+ if (journal->j_trans_id == trans_id) {
+ atomic_set(&(journal->j_jlock), 1) ;
+ }
+ unlock_journal(p_s_sb);
+ }
+ }
+ if (journal->j_trans_id == trans_id) {
+ BUG();
+ }
+ if (commit_now && journal_list_still_alive(p_s_sb, trans_id) &&
+ wait_on_commit)
+ {
+ flush_commit_list(p_s_sb, jl, 1) ;
+ }
+ return 0 ;
+ }
+ unlock_journal(p_s_sb) ;
+ return 0 ;
+ }
+
+ /* deal with old transactions where we are the last writers */
+ now = get_seconds();
+ if ((now - journal->j_trans_start_time) > journal->j_max_trans_age) {
+ commit_now = 1 ;
+ journal->j_next_async_flush = 1 ;
+ }
+ /* don't batch when someone is waiting on j_join_wait */
+ /* don't batch when syncing the commit or flushing the whole trans */
+ if (!(journal->j_must_wait > 0) && !(atomic_read(&(journal->j_jlock))) && !flush && !commit_now &&
+ (journal->j_len < journal->j_max_batch) &&
+ journal->j_len_alloc < journal->j_max_batch && journal->j_cnode_free > (journal->j_trans_max * 3)) {
+ journal->j_bcount++ ;
+ unlock_journal(p_s_sb) ;
+ return 0 ;
+ }
+
+ if (journal->j_start > SB_ONDISK_JOURNAL_SIZE(p_s_sb)) {
+ reiserfs_panic(p_s_sb, "journal-003: journal_end: j_start (%ld) is too high\n", journal->j_start) ;
+ }
+ return 1 ;
+}
+
+/*
+** 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 *p_s_sb, b_blocknr_t blocknr) {
+ struct reiserfs_journal *journal = SB_JOURNAL (p_s_sb);
+ struct reiserfs_journal_cnode *cn = NULL ;
+ struct buffer_head *bh = NULL ;
+ struct reiserfs_list_bitmap *jb = NULL ;
+ int cleaned = 0 ;
+ BUG_ON (!th->t_trans_id);
+
+ cn = get_journal_hash_dev(p_s_sb, journal->j_hash_table, blocknr);
+ if (cn && cn->bh) {
+ bh = cn->bh ;
+ get_bh(bh) ;
+ }
+ /* if it is journal new, we just remove it from this transaction */
+ if (bh && buffer_journal_new(bh)) {
+ clear_buffer_journal_new (bh);
+ clear_prepared_bits(bh) ;
+ reiserfs_clean_and_file_buffer(bh) ;
+ cleaned = remove_from_transaction(p_s_sb, blocknr, cleaned) ;
+ } else {
+ /* 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(p_s_sb, "journal-1702: journal_mark_freed, journal_list_bitmap is NULL\n") ;
+ }
+ set_bit_in_list_bitmap(p_s_sb, blocknr, jb) ;
+
+ /* Note, the entire while loop is not allowed to schedule. */
+
+ if (bh) {
+ clear_prepared_bits(bh) ;
+ reiserfs_clean_and_file_buffer(bh) ;
+ }
+ cleaned = remove_from_transaction(p_s_sb, blocknr, cleaned) ;
+
+ /* find all older transactions with this block, make sure they don't try to write it out */
+ cn = get_journal_hash_dev(p_s_sb,journal->j_list_hash_table, blocknr) ;
+ while (cn) {
+ if (p_s_sb == cn->sb && blocknr == cn->blocknr) {
+ set_bit(BLOCK_FREED, &cn->state) ;
+ if (cn->bh) {
+ 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);
+ clear_buffer_journal_test(cn->bh);
+ cleaned = 1 ;
+ put_bh(cn->bh) ;
+ if (atomic_read(&(cn->bh->b_count)) < 0) {
+ reiserfs_warning (p_s_sb, "journal-2138: cn->bh->b_count < 0");
+ }
+ }
+ if (cn->jlist) { /* since we are clearing the bh, we MUST dec nonzerolen */
+ atomic_dec(&(cn->jlist->j_nonzerolen)) ;
+ }
+ cn->bh = NULL ;
+ }
+ }
+ cn = cn->hnext ;
+ }
+ }
+
+ if (bh) {
+ put_bh(bh) ; /* get_hash grabs the buffer */
+ if (atomic_read(&(bh->b_count)) < 0) {
+ reiserfs_warning (p_s_sb, "journal-2165: bh->b_count < 0");
+ }
+ }
+ return 0 ;
+}
+
+void reiserfs_update_inode_transaction(struct inode *inode) {
+ struct reiserfs_journal *journal = SB_JOURNAL (inode->i_sb);
+ REISERFS_I(inode)->i_jl = journal->j_current_jl;
+ REISERFS_I(inode)->i_trans_id = journal->j_trans_id ;
+}
+
+/*
+ * returns -1 on error, 0 if no commits/barriers were done and 1
+ * if a transaction was actually committed and the barrier was done
+ */
+static int __commit_trans_jl(struct inode *inode, unsigned long id,
+ struct reiserfs_journal_list *jl)
+{
+ struct reiserfs_transaction_handle th ;
+ struct super_block *sb = inode->i_sb ;
+ struct reiserfs_journal *journal = SB_JOURNAL (sb);
+ int ret = 0;
+
+ /* 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 */
+ let_transaction_grow(sb, id);
+ if (journal->j_trans_id != id) {
+ goto flush_commit_only;
+ }
+
+ ret = journal_begin(&th, sb, 1) ;
+ if (ret)
+ return ret;
+
+ /* someone might have ended this transaction while we joined */
+ if (journal->j_trans_id != id) {
+ reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb), 1) ;
+ journal_mark_dirty(&th, sb, SB_BUFFER_WITH_SB(sb)) ;
+ ret = journal_end(&th, sb, 1) ;
+ goto flush_commit_only;
+ }
+
+ ret = journal_end_sync(&th, sb, 1) ;
+ if (!ret)
+ ret = 1;
+
+ } else {
+ /* 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
+ */
+flush_commit_only:
+ if (journal_list_still_alive(inode->i_sb, id)) {
+ /*
+ * we only set ret to 1 when we know for sure
+ * the barrier hasn't been started yet on the commit
+ * block.
+ */
+ if (atomic_read(&jl->j_commit_left) > 1)
+ ret = 1;
+ flush_commit_list(sb, jl, 1) ;
+ if (journal->j_errno)
+ ret = journal->j_errno;
+ }
+ }
+ /* otherwise the list is gone, and long since committed */
+ return ret;
+}
+
+int reiserfs_commit_for_inode(struct inode *inode) {
+ unsigned long 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
+ * changed in the current transaction. More conservative
+ */
+ if (!id || !jl) {
+ reiserfs_update_inode_transaction(inode) ;
+ id = REISERFS_I(inode)->i_trans_id;
+ /* jl will be updated in __commit_trans_jl */
+ }
+
+ return __commit_trans_jl(inode, id, jl);
+}
+
+void reiserfs_restore_prepared_buffer(struct super_block *p_s_sb,
+ struct buffer_head *bh) {
+ struct reiserfs_journal *journal = SB_JOURNAL (p_s_sb);
+ PROC_INFO_INC( p_s_sb, journal.restore_prepared );
+ if (!bh) {
+ return ;
+ }
+ if (test_clear_buffer_journal_restore_dirty (bh) &&
+ buffer_journal_dirty(bh)) {
+ struct reiserfs_journal_cnode *cn;
+ cn = get_journal_hash_dev(p_s_sb,
+ journal->j_list_hash_table,
+ bh->b_blocknr);
+ if (cn && can_dirty(cn)) {
+ set_buffer_journal_test (bh);
+ mark_buffer_dirty(bh);
+ }
+ }
+ clear_buffer_journal_prepared (bh);
+}
+
+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.
+**
+*/
+int reiserfs_prepare_for_journal(struct super_block *p_s_sb,
+ struct buffer_head *bh, int wait) {
+ PROC_INFO_INC( p_s_sb, journal.prepare );
+
+ if (test_set_buffer_locked(bh)) {
+ if (!wait)
+ return 0;
+ lock_buffer(bh);
+ }
+ set_buffer_journal_prepared (bh);
+ if (test_clear_buffer_dirty(bh) && buffer_journal_dirty(bh)) {
+ clear_buffer_journal_test (bh);
+ set_buffer_journal_restore_dirty (bh);
+ }
+ unlock_buffer(bh);
+ return 1;
+}
+
+static void flush_old_journal_lists(struct super_block *s) {
+ struct reiserfs_journal *journal = SB_JOURNAL (s);
+ struct reiserfs_journal_list *jl;
+ struct list_head *entry;
+ time_t now = get_seconds();
+
+ while(!list_empty(&journal->j_journal_list)) {
+ entry = journal->j_journal_list.next;
+ jl = JOURNAL_LIST_ENTRY(entry);
+ /* this check should always be run, to send old lists to disk */
+ if (jl->j_timestamp < (now - (JOURNAL_MAX_TRANS_AGE * 4))) {
+ flush_used_journal_lists(s, jl);
+ } else {
+ break;
+ }
+ }
+}
+
+/*
+** 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 * p_s_sb, unsigned long nblocks,
+ int flags) {
+ struct reiserfs_journal *journal = SB_JOURNAL (p_s_sb);
+ struct reiserfs_journal_cnode *cn, *next, *jl_cn;
+ struct reiserfs_journal_cnode *last_cn = NULL;
+ struct reiserfs_journal_desc *desc ;
+ struct reiserfs_journal_commit *commit ;
+ struct buffer_head *c_bh ; /* commit bh */
+ struct buffer_head *d_bh ; /* desc bh */
+ int cur_write_start = 0 ; /* start index of current log write */
+ int old_start ;
+ int i ;
+ int flush = flags & FLUSH_ALL ;
+ int wait_on_commit = flags & WAIT ;
+ struct reiserfs_journal_list *jl, *temp_jl;
+ struct list_head *entry, *safe;
+ unsigned long jindex;
+ unsigned long commit_trans_id;
+ int trans_half;
+
+ BUG_ON (th->t_refcount > 1);
+ BUG_ON (!th->t_trans_id);
+
+ current->journal_info = th->t_handle_save;
+ reiserfs_check_lock_depth(p_s_sb, "journal end");
+ if (journal->j_len == 0) {
+ reiserfs_prepare_for_journal(p_s_sb, SB_BUFFER_WITH_SB(p_s_sb), 1) ;
+ journal_mark_dirty(th, p_s_sb, SB_BUFFER_WITH_SB(p_s_sb)) ;
+ }
+
+ lock_journal(p_s_sb) ;
+ if (journal->j_next_full_flush) {
+ flags |= FLUSH_ALL ;
+ flush = 1 ;
+ }
+ if (journal->j_next_async_flush) {
+ flags |= COMMIT_NOW | WAIT;
+ 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
+ */
+ if (!check_journal_end(th, p_s_sb, nblocks, flags)) {
+ p_s_sb->s_dirt = 1;
+ wake_queued_writers(p_s_sb);
+ reiserfs_async_progress_wait(p_s_sb);
+ goto out ;
+ }
+
+ /* check_journal_end might set these, check again */
+ if (journal->j_next_full_flush) {
+ flush = 1 ;
+ }
+
+ /*
+ ** 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 */
+ current->journal_info = th ;
+ reiserfs_discard_all_prealloc(th); /* it should not involve new blocks into
+ * the transaction */
+ current->journal_info = th->t_handle_save ;
+#endif
+
+ /* setup description block */
+ d_bh = journal_getblk(p_s_sb, SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) + journal->j_start) ;
+ set_buffer_uptodate(d_bh);
+ desc = (struct reiserfs_journal_desc *)(d_bh)->b_data ;
+ memset(d_bh->b_data, 0, d_bh->b_size) ;
+ 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 */
+ c_bh = journal_getblk(p_s_sb, SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) +
+ ((journal->j_start + journal->j_len + 1) % SB_ONDISK_JOURNAL_SIZE(p_s_sb))) ;
+ commit = (struct reiserfs_journal_commit *)c_bh->b_data ;
+ memset(c_bh->b_data, 0, c_bh->b_size) ;
+ set_commit_trans_id(commit, journal->j_trans_id) ;
+ set_buffer_uptodate(c_bh) ;
+
+ /* init this journal list */
+ jl = journal->j_current_jl;
+
+ /* 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
+ */
+ down(&jl->j_commit_lock);
+
+ /* save the transaction id in case we need to commit it later */
+ commit_trans_id = jl->j_trans_id;
+
+ atomic_set(&jl->j_older_commits_done, 0) ;
+ jl->j_trans_id = journal->j_trans_id ;
+ jl->j_timestamp = journal->j_trans_start_time ;
+ jl->j_commit_bh = c_bh ;
+ jl->j_start = journal->j_start ;
+ jl->j_len = journal->j_len ;
+ atomic_set(&jl->j_nonzerolen, journal->j_len) ;
+ 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
+ */
+ trans_half = journal_trans_half(p_s_sb->s_blocksize);
+ for (i = 0, cn = journal->j_first ; cn ; cn = cn->next, i++) {
+ if (buffer_journaled (cn->bh)) {
+ jl_cn = get_cnode(p_s_sb) ;
+ if (!jl_cn) {
+ reiserfs_panic(p_s_sb, "journal-1676, get_cnode returned NULL\n") ;
+ }
+ if (i == 0) {
+ jl->j_realblock = jl_cn ;
+ }
+ jl_cn->prev = last_cn ;
+ jl_cn->next = NULL ;
+ if (last_cn) {
+ 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 */
+
+ if (is_block_in_log_or_reserved_area(p_s_sb, cn->bh->b_blocknr)) {
+ reiserfs_panic(p_s_sb, "journal-2332: Trying to log block %lu, which is a log block\n", cn->bh->b_blocknr) ;
+ }
+ jl_cn->blocknr = cn->bh->b_blocknr ;
+ jl_cn->state = 0 ;
+ jl_cn->sb = p_s_sb;
+ jl_cn->bh = cn->bh ;
+ jl_cn->jlist = jl;
+ insert_journal_hash(journal->j_list_hash_table, jl_cn) ;
+ if (i < trans_half) {
+ desc->j_realblock[i] = cpu_to_le32(cn->bh->b_blocknr) ;
+ } else {
+ commit->j_realblock[i - trans_half] = cpu_to_le32(cn->bh->b_blocknr) ;
+ }
+ } else {
+ i-- ;
+ }
+ }
+ set_desc_trans_len(desc, journal->j_len) ;
+ set_desc_mount_id(desc, journal->j_mount_id) ;
+ 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 */
+ if (journal->j_len == 0) {
+ BUG();
+ }
+
+ /* 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 */
+ cur_write_start = journal->j_start ;
+ cn = journal->j_first ;
+ 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 */
+ if (buffer_journaled (cn->bh)) {
+ struct buffer_head *tmp_bh ;
+ char *addr;
+ struct page *page;
+ tmp_bh = journal_getblk(p_s_sb, SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) +
+ ((cur_write_start + jindex) % SB_ONDISK_JOURNAL_SIZE(p_s_sb))) ;
+ set_buffer_uptodate(tmp_bh);
+ page = cn->bh->b_page;
+ addr = kmap(page);
+ memcpy(tmp_bh->b_data, addr + offset_in_page(cn->bh->b_data),
+ cn->bh->b_size);
+ kunmap(page);
+ mark_buffer_dirty(tmp_bh);
+ jindex++ ;
+ set_buffer_journal_dirty (cn->bh);
+ clear_buffer_journaled (cn->bh);
+ } else {
+ /* JDirty cleared sometime during transaction. don't log this one */
+ reiserfs_warning(p_s_sb, "journal-2048: do_journal_end: BAD, buffer in journal hash, but not JDirty!") ;
+ brelse(cn->bh) ;
+ }
+ next = cn->next ;
+ free_cnode(p_s_sb, cn) ;
+ cn = next ;
+ cond_resched();
+ }
+
+ /* 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(p_s_sb);
+
+ /* now it is safe to insert this transaction on the main list */
+ list_add_tail(&jl->j_list, &journal->j_journal_list);
+ list_add_tail(&jl->j_working_list, &journal->j_working_list);
+ journal->j_num_work_lists++;
+
+ /* reset journal values for the next transaction */
+ old_start = journal->j_start ;
+ journal->j_start = (journal->j_start + journal->j_len + 2) % SB_ONDISK_JOURNAL_SIZE(p_s_sb);
+ atomic_set(&(journal->j_wcount), 0) ;
+ journal->j_bcount = 0 ;
+ journal->j_last = NULL ;
+ journal->j_first = NULL ;
+ journal->j_len = 0 ;
+ journal->j_trans_start_time = 0 ;
+ journal->j_trans_id++ ;
+ journal->j_current_jl->j_trans_id = journal->j_trans_id;
+ journal->j_must_wait = 0 ;
+ journal->j_len_alloc = 0 ;
+ journal->j_next_full_flush = 0 ;
+ journal->j_next_async_flush = 0 ;
+ init_journal_hash(p_s_sb) ;
+
+ // 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
+ * 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.
+ */
+ if (!list_empty(&jl->j_tail_bh_list)) {
+ unlock_kernel();
+ write_ordered_buffers(&journal->j_dirty_buffers_lock,
+ journal, jl, &jl->j_tail_bh_list);
+ lock_kernel();
+ }
+ if (!list_empty(&jl->j_tail_bh_list))
+ BUG();
+ up(&jl->j_commit_lock);
+
+ /* 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(p_s_sb, jl, 1) ;
+ flush_journal_list(p_s_sb, jl, 1) ;
+ } else if (!(jl->j_state & LIST_COMMIT_PENDING))
+ queue_delayed_work(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.
+ */
+first_jl:
+ list_for_each_safe(entry, safe, &journal->j_journal_list) {
+ temp_jl = JOURNAL_LIST_ENTRY(entry);
+ if (journal->j_start <= temp_jl->j_start) {
+ if ((journal->j_start + journal->j_trans_max + 1) >=
+ temp_jl->j_start)
+ {
+ flush_used_journal_lists(p_s_sb, temp_jl);
+ goto first_jl;
+ } else if ((journal->j_start +
+ journal->j_trans_max + 1) <
+ SB_ONDISK_JOURNAL_SIZE(p_s_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
+ * break now
+ */
+ break;
+ }
+ } else if ((journal->j_start +
+ journal->j_trans_max + 1) >
+ SB_ONDISK_JOURNAL_SIZE(p_s_sb))
+ {
+ if (((journal->j_start + journal->j_trans_max + 1) %
+ SB_ONDISK_JOURNAL_SIZE(p_s_sb)) >= temp_jl->j_start)
+ {
+ flush_used_journal_lists(p_s_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
+ */
+ break;
+ }
+ }
+ }
+ flush_old_journal_lists(p_s_sb);
+
+ journal->j_current_jl->j_list_bitmap = get_list_bitmap(p_s_sb, journal->j_current_jl) ;
+
+ if (!(journal->j_current_jl->j_list_bitmap)) {
+ reiserfs_panic(p_s_sb, "journal-1996: do_journal_end, could not get a list bitmap\n") ;
+ }
+
+ atomic_set(&(journal->j_jlock), 0) ;
+ unlock_journal(p_s_sb) ;
+ /* wake up any body waiting to join. */
+ clear_bit(J_WRITERS_QUEUED, &journal->j_state);
+ wake_up(&(journal->j_join_wait)) ;
+
+ if (!flush && wait_on_commit &&
+ journal_list_still_alive(p_s_sb, commit_trans_id)) {
+ flush_commit_list(p_s_sb, jl, 1) ;
+ }
+out:
+ reiserfs_check_lock_depth(p_s_sb, "journal end2");
+
+ memset (th, 0, sizeof (*th));
+ /* 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 */
+ th->t_super = p_s_sb;
+
+ return journal->j_errno;
+}
+
+static void
+__reiserfs_journal_abort_hard (struct super_block *sb)
+{
+ struct reiserfs_journal *journal = SB_JOURNAL (sb);
+ if (test_bit (J_ABORTED, &journal->j_state))
+ return;
+
+ printk (KERN_CRIT "REISERFS: Aborting journal for filesystem on %s\n",
+ reiserfs_bdevname (sb));
+
+ sb->s_flags |= MS_RDONLY;
+ set_bit (J_ABORTED, &journal->j_state);
+
+#ifdef CONFIG_REISERFS_CHECK
+ dump_stack();
+#endif
+}
+
+static void
+__reiserfs_journal_abort_soft (struct super_block *sb, int errno)
+{
+ struct reiserfs_journal *journal = SB_JOURNAL (sb);
+ if (test_bit (J_ABORTED, &journal->j_state))
+ return;
+
+ if (!journal->j_errno)
+ journal->j_errno = errno;
+
+ __reiserfs_journal_abort_hard (sb);
+}
+
+void
+reiserfs_journal_abort (struct super_block *sb, int errno)
+{
+ return __reiserfs_journal_abort_soft (sb, errno);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-10 03:42:44 +0000