2 ** Write ahead logging implementation copyright Chris Mason 2000
4 ** The background commits make this code very interelated, and
5 ** overly complex. I need to rethink things a bit....The major players:
7 ** journal_begin -- call with the number of blocks you expect to log.
8 ** If the current transaction is too
9 ** old, it will block until the current transaction is
10 ** finished, and then start a new one.
11 ** Usually, your transaction will get joined in with
12 ** previous ones for speed.
14 ** journal_join -- same as journal_begin, but won't block on the current
15 ** transaction regardless of age. Don't ever call
16 ** this. Ever. There are only two places it should be
17 ** called from, and they are both inside this file.
19 ** journal_mark_dirty -- adds blocks into this transaction. clears any flags
20 ** that might make them get sent to disk
21 ** and then marks them BH_JDirty. Puts the buffer head
22 ** into the current transaction hash.
24 ** journal_end -- if the current transaction is batchable, it does nothing
25 ** otherwise, it could do an async/synchronous commit, or
26 ** a full flush of all log and real blocks in the
29 ** flush_old_commits -- if the current transaction is too old, it is ended and
30 ** commit blocks are sent to disk. Forces commit blocks
31 ** to disk for all backgrounded commits that have been
33 ** -- Note, if you call this as an immediate flush from
34 ** from within kupdate, it will ignore the immediate flag
37 #include <linux/config.h>
38 #include <asm/uaccess.h>
39 #include <asm/system.h>
41 #include <linux/time.h>
42 #include <asm/semaphore.h>
44 #include <linux/vmalloc.h>
45 #include <linux/reiserfs_fs.h>
47 #include <linux/kernel.h>
48 #include <linux/errno.h>
49 #include <linux/fcntl.h>
50 #include <linux/stat.h>
51 #include <linux/string.h>
52 #include <linux/smp_lock.h>
53 #include <linux/buffer_head.h>
54 #include <linux/workqueue.h>
55 #include <linux/writeback.h>
56 #include <linux/blkdev.h>
58 /* gets a struct reiserfs_journal_list * from a list head */
59 #define JOURNAL_LIST_ENTRY(h) (list_entry((h), struct reiserfs_journal_list, \
61 #define JOURNAL_WORK_ENTRY(h) (list_entry((h), struct reiserfs_journal_list, \
64 /* the number of mounted filesystems. This is used to decide when to
65 ** start and kill the commit workqueue
67 static int reiserfs_mounted_fs_count;
69 static struct workqueue_struct *commit_wq;
71 #define JOURNAL_TRANS_HALF 1018 /* must be correct to keep the desc and commit
73 #define BUFNR 64 /*read ahead */
75 /* cnode stat bits. Move these into reiserfs_fs.h */
77 #define BLOCK_FREED 2 /* this block was freed, and can't be written. */
78 #define BLOCK_FREED_HOLDER 3 /* this block was freed during this transaction, and can't be written */
80 #define BLOCK_NEEDS_FLUSH 4 /* used in flush_journal_list */
81 #define BLOCK_DIRTIED 5
83 /* journal list state bits */
84 #define LIST_TOUCHED 1
86 #define LIST_COMMIT_PENDING 4 /* someone will commit this list */
88 /* flags for do_journal_end */
89 #define FLUSH_ALL 1 /* flush commit and real blocks */
90 #define COMMIT_NOW 2 /* end and commit this transaction */
91 #define WAIT 4 /* wait for the log blocks to hit the disk */
93 static int do_journal_end(struct reiserfs_transaction_handle *,
94 struct super_block *, unsigned long nblocks,
96 static int flush_journal_list(struct super_block *s,
97 struct reiserfs_journal_list *jl, int flushall);
98 static int flush_commit_list(struct super_block *s,
99 struct reiserfs_journal_list *jl, int flushall);
100 static int can_dirty(struct reiserfs_journal_cnode *cn);
101 static int journal_join(struct reiserfs_transaction_handle *th,
102 struct super_block *p_s_sb, unsigned long nblocks);
103 static int release_journal_dev(struct super_block *super,
104 struct reiserfs_journal *journal);
105 static int dirty_one_transaction(struct super_block *s,
106 struct reiserfs_journal_list *jl);
107 static void flush_async_commits(void *p);
108 static void queue_log_writer(struct super_block *s);
110 /* values for join in do_journal_begin_r */
112 JBEGIN_REG = 0, /* regular journal begin */
113 JBEGIN_JOIN = 1, /* join the running transaction if at all possible */
114 JBEGIN_ABORT = 2, /* called from cleanup code, ignores aborted flag */
117 static int do_journal_begin_r(struct reiserfs_transaction_handle *th,
118 struct super_block *p_s_sb,
119 unsigned long nblocks, int join);
121 static void init_journal_hash(struct super_block *p_s_sb)
123 struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
124 memset(journal->j_hash_table, 0,
125 JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *));
129 ** clears BH_Dirty and sticks the buffer on the clean list. Called because I can't allow refile_buffer to
130 ** make schedule happen after I've freed a block. Look at remove_from_transaction and journal_mark_freed for
133 static int reiserfs_clean_and_file_buffer(struct buffer_head *bh)
136 clear_buffer_dirty(bh);
137 clear_buffer_journal_test(bh);
142 static void disable_barrier(struct super_block *s)
144 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_BARRIER_FLUSH);
145 printk("reiserfs: disabling flush barriers on %s\n",
146 reiserfs_bdevname(s));
149 static struct reiserfs_bitmap_node *allocate_bitmap_node(struct super_block
152 struct reiserfs_bitmap_node *bn;
155 bn = kmalloc(sizeof(struct reiserfs_bitmap_node), GFP_NOFS);
159 bn->data = kzalloc(p_s_sb->s_blocksize, GFP_NOFS);
165 INIT_LIST_HEAD(&bn->list);
169 static struct reiserfs_bitmap_node *get_bitmap_node(struct super_block *p_s_sb)
171 struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
172 struct reiserfs_bitmap_node *bn = NULL;
173 struct list_head *entry = journal->j_bitmap_nodes.next;
175 journal->j_used_bitmap_nodes++;
178 if (entry != &journal->j_bitmap_nodes) {
179 bn = list_entry(entry, struct reiserfs_bitmap_node, list);
181 memset(bn->data, 0, p_s_sb->s_blocksize);
182 journal->j_free_bitmap_nodes--;
185 bn = allocate_bitmap_node(p_s_sb);
192 static inline void free_bitmap_node(struct super_block *p_s_sb,
193 struct reiserfs_bitmap_node *bn)
195 struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
196 journal->j_used_bitmap_nodes--;
197 if (journal->j_free_bitmap_nodes > REISERFS_MAX_BITMAP_NODES) {
201 list_add(&bn->list, &journal->j_bitmap_nodes);
202 journal->j_free_bitmap_nodes++;
206 static void allocate_bitmap_nodes(struct super_block *p_s_sb)
209 struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
210 struct reiserfs_bitmap_node *bn = NULL;
211 for (i = 0; i < REISERFS_MIN_BITMAP_NODES; i++) {
212 bn = allocate_bitmap_node(p_s_sb);
214 list_add(&bn->list, &journal->j_bitmap_nodes);
215 journal->j_free_bitmap_nodes++;
217 break; // this is ok, we'll try again when more are needed
222 static int set_bit_in_list_bitmap(struct super_block *p_s_sb, int block,
223 struct reiserfs_list_bitmap *jb)
225 int bmap_nr = block / (p_s_sb->s_blocksize << 3);
226 int bit_nr = block % (p_s_sb->s_blocksize << 3);
228 if (!jb->bitmaps[bmap_nr]) {
229 jb->bitmaps[bmap_nr] = get_bitmap_node(p_s_sb);
231 set_bit(bit_nr, (unsigned long *)jb->bitmaps[bmap_nr]->data);
235 static void cleanup_bitmap_list(struct super_block *p_s_sb,
236 struct reiserfs_list_bitmap *jb)
239 if (jb->bitmaps == NULL)
242 for (i = 0; i < SB_BMAP_NR(p_s_sb); i++) {
243 if (jb->bitmaps[i]) {
244 free_bitmap_node(p_s_sb, jb->bitmaps[i]);
245 jb->bitmaps[i] = NULL;
251 ** only call this on FS unmount.
253 static int free_list_bitmaps(struct super_block *p_s_sb,
254 struct reiserfs_list_bitmap *jb_array)
257 struct reiserfs_list_bitmap *jb;
258 for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
260 jb->journal_list = NULL;
261 cleanup_bitmap_list(p_s_sb, jb);
268 static int free_bitmap_nodes(struct super_block *p_s_sb)
270 struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
271 struct list_head *next = journal->j_bitmap_nodes.next;
272 struct reiserfs_bitmap_node *bn;
274 while (next != &journal->j_bitmap_nodes) {
275 bn = list_entry(next, struct reiserfs_bitmap_node, list);
279 next = journal->j_bitmap_nodes.next;
280 journal->j_free_bitmap_nodes--;
287 ** get memory for JOURNAL_NUM_BITMAPS worth of bitmaps.
288 ** jb_array is the array to be filled in.
290 int reiserfs_allocate_list_bitmaps(struct super_block *p_s_sb,
291 struct reiserfs_list_bitmap *jb_array,
296 struct reiserfs_list_bitmap *jb;
297 int mem = bmap_nr * sizeof(struct reiserfs_bitmap_node *);
299 for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
301 jb->journal_list = NULL;
302 jb->bitmaps = vmalloc(mem);
304 reiserfs_warning(p_s_sb,
305 "clm-2000, unable to allocate bitmaps for journal lists");
309 memset(jb->bitmaps, 0, mem);
312 free_list_bitmaps(p_s_sb, jb_array);
319 ** find an available list bitmap. If you can't find one, flush a commit list
322 static struct reiserfs_list_bitmap *get_list_bitmap(struct super_block *p_s_sb,
323 struct reiserfs_journal_list
327 struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
328 struct reiserfs_list_bitmap *jb = NULL;
330 for (j = 0; j < (JOURNAL_NUM_BITMAPS * 3); j++) {
331 i = journal->j_list_bitmap_index;
332 journal->j_list_bitmap_index = (i + 1) % JOURNAL_NUM_BITMAPS;
333 jb = journal->j_list_bitmap + i;
334 if (journal->j_list_bitmap[i].journal_list) {
335 flush_commit_list(p_s_sb,
336 journal->j_list_bitmap[i].
338 if (!journal->j_list_bitmap[i].journal_list) {
345 if (jb->journal_list) { /* double check to make sure if flushed correctly */
348 jb->journal_list = jl;
353 ** allocates a new chunk of X nodes, and links them all together as a list.
354 ** Uses the cnode->next and cnode->prev pointers
355 ** returns NULL on failure
357 static struct reiserfs_journal_cnode *allocate_cnodes(int num_cnodes)
359 struct reiserfs_journal_cnode *head;
361 if (num_cnodes <= 0) {
364 head = vmalloc(num_cnodes * sizeof(struct reiserfs_journal_cnode));
368 memset(head, 0, num_cnodes * sizeof(struct reiserfs_journal_cnode));
370 head[0].next = head + 1;
371 for (i = 1; i < num_cnodes; i++) {
372 head[i].prev = head + (i - 1);
373 head[i].next = head + (i + 1); /* if last one, overwrite it after the if */
375 head[num_cnodes - 1].next = NULL;
380 ** pulls a cnode off the free list, or returns NULL on failure
382 static struct reiserfs_journal_cnode *get_cnode(struct super_block *p_s_sb)
384 struct reiserfs_journal_cnode *cn;
385 struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
387 reiserfs_check_lock_depth(p_s_sb, "get_cnode");
389 if (journal->j_cnode_free <= 0) {
392 journal->j_cnode_used++;
393 journal->j_cnode_free--;
394 cn = journal->j_cnode_free_list;
399 cn->next->prev = NULL;
401 journal->j_cnode_free_list = cn->next;
402 memset(cn, 0, sizeof(struct reiserfs_journal_cnode));
407 ** returns a cnode to the free list
409 static void free_cnode(struct super_block *p_s_sb,
410 struct reiserfs_journal_cnode *cn)
412 struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
414 reiserfs_check_lock_depth(p_s_sb, "free_cnode");
416 journal->j_cnode_used--;
417 journal->j_cnode_free++;
418 /* memset(cn, 0, sizeof(struct reiserfs_journal_cnode)) ; */
419 cn->next = journal->j_cnode_free_list;
420 if (journal->j_cnode_free_list) {
421 journal->j_cnode_free_list->prev = cn;
423 cn->prev = NULL; /* not needed with the memset, but I might kill the memset, and forget to do this */
424 journal->j_cnode_free_list = cn;
427 static void clear_prepared_bits(struct buffer_head *bh)
429 clear_buffer_journal_prepared(bh);
430 clear_buffer_journal_restore_dirty(bh);
433 /* utility function to force a BUG if it is called without the big
434 ** kernel lock held. caller is the string printed just before calling BUG()
436 void reiserfs_check_lock_depth(struct super_block *sb, char *caller)
439 if (current->lock_depth < 0) {
440 reiserfs_panic(sb, "%s called without kernel lock held",
448 /* return a cnode with same dev, block number and size in table, or null if not found */
449 static inline struct reiserfs_journal_cnode *get_journal_hash_dev(struct
453 reiserfs_journal_cnode
457 struct reiserfs_journal_cnode *cn;
458 cn = journal_hash(table, sb, bl);
460 if (cn->blocknr == bl && cn->sb == sb)
464 return (struct reiserfs_journal_cnode *)0;
468 ** this actually means 'can this block be reallocated yet?'. If you set search_all, a block can only be allocated
469 ** if it is not in the current transaction, was not freed by the current transaction, and has no chance of ever
470 ** being overwritten by a replay after crashing.
472 ** If you don't set search_all, a block can only be allocated if it is not in the current transaction. Since deleting
473 ** a block removes it from the current transaction, this case should never happen. If you don't set search_all, make
474 ** sure you never write the block without logging it.
476 ** next_zero_bit is a suggestion about the next block to try for find_forward.
477 ** when bl is rejected because it is set in a journal list bitmap, we search
478 ** for the next zero bit in the bitmap that rejected bl. Then, we return that
479 ** through next_zero_bit for find_forward to try.
481 ** Just because we return something in next_zero_bit does not mean we won't
482 ** reject it on the next call to reiserfs_in_journal
485 int reiserfs_in_journal(struct super_block *p_s_sb,
486 int bmap_nr, int bit_nr, int search_all,
487 b_blocknr_t * next_zero_bit)
489 struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
490 struct reiserfs_journal_cnode *cn;
491 struct reiserfs_list_bitmap *jb;
495 *next_zero_bit = 0; /* always start this at zero. */
497 PROC_INFO_INC(p_s_sb, journal.in_journal);
498 /* If we aren't doing a search_all, this is a metablock, and it will be logged before use.
499 ** if we crash before the transaction that freed it commits, this transaction won't
500 ** have committed either, and the block will never be written
503 for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
504 PROC_INFO_INC(p_s_sb, journal.in_journal_bitmap);
505 jb = journal->j_list_bitmap + i;
506 if (jb->journal_list && jb->bitmaps[bmap_nr] &&
508 (unsigned long *)jb->bitmaps[bmap_nr]->
511 find_next_zero_bit((unsigned long *)
512 (jb->bitmaps[bmap_nr]->
514 p_s_sb->s_blocksize << 3,
521 bl = bmap_nr * (p_s_sb->s_blocksize << 3) + bit_nr;
522 /* is it in any old transactions? */
525 get_journal_hash_dev(p_s_sb, journal->j_list_hash_table, bl))) {
529 /* is it in the current transaction. This should never happen */
530 if ((cn = get_journal_hash_dev(p_s_sb, journal->j_hash_table, bl))) {
535 PROC_INFO_INC(p_s_sb, journal.in_journal_reusable);
540 /* insert cn into table
542 static inline void insert_journal_hash(struct reiserfs_journal_cnode **table,
543 struct reiserfs_journal_cnode *cn)
545 struct reiserfs_journal_cnode *cn_orig;
547 cn_orig = journal_hash(table, cn->sb, cn->blocknr);
553 journal_hash(table, cn->sb, cn->blocknr) = cn;
556 /* lock the current transaction */
557 static inline void lock_journal(struct super_block *p_s_sb)
559 PROC_INFO_INC(p_s_sb, journal.lock_journal);
560 down(&SB_JOURNAL(p_s_sb)->j_lock);
563 /* unlock the current transaction */
564 static inline void unlock_journal(struct super_block *p_s_sb)
566 up(&SB_JOURNAL(p_s_sb)->j_lock);
569 static inline void get_journal_list(struct reiserfs_journal_list *jl)
574 static inline void put_journal_list(struct super_block *s,
575 struct reiserfs_journal_list *jl)
577 if (jl->j_refcount < 1) {
578 reiserfs_panic(s, "trans id %lu, refcount at %d",
579 jl->j_trans_id, jl->j_refcount);
581 if (--jl->j_refcount == 0)
586 ** this used to be much more involved, and I'm keeping it just in case things get ugly again.
587 ** it gets called by flush_commit_list, and cleans up any data stored about blocks freed during a
590 static void cleanup_freed_for_journal_list(struct super_block *p_s_sb,
591 struct reiserfs_journal_list *jl)
594 struct reiserfs_list_bitmap *jb = jl->j_list_bitmap;
596 cleanup_bitmap_list(p_s_sb, jb);
598 jl->j_list_bitmap->journal_list = NULL;
599 jl->j_list_bitmap = NULL;
602 static int journal_list_still_alive(struct super_block *s,
603 unsigned long trans_id)
605 struct reiserfs_journal *journal = SB_JOURNAL(s);
606 struct list_head *entry = &journal->j_journal_list;
607 struct reiserfs_journal_list *jl;
609 if (!list_empty(entry)) {
610 jl = JOURNAL_LIST_ENTRY(entry->next);
611 if (jl->j_trans_id <= trans_id) {
618 static void reiserfs_end_buffer_io_sync(struct buffer_head *bh, int uptodate)
620 char b[BDEVNAME_SIZE];
622 if (buffer_journaled(bh)) {
623 reiserfs_warning(NULL,
624 "clm-2084: pinned buffer %lu:%s sent to disk",
625 bh->b_blocknr, bdevname(bh->b_bdev, b));
628 set_buffer_uptodate(bh);
630 clear_buffer_uptodate(bh);
635 static void reiserfs_end_ordered_io(struct buffer_head *bh, int uptodate)
638 set_buffer_uptodate(bh);
640 clear_buffer_uptodate(bh);
645 static void submit_logged_buffer(struct buffer_head *bh)
648 bh->b_end_io = reiserfs_end_buffer_io_sync;
649 clear_buffer_journal_new(bh);
650 clear_buffer_dirty(bh);
651 if (!test_clear_buffer_journal_test(bh))
653 if (!buffer_uptodate(bh))
655 submit_bh(WRITE, bh);
658 static void submit_ordered_buffer(struct buffer_head *bh)
661 bh->b_end_io = reiserfs_end_ordered_io;
662 clear_buffer_dirty(bh);
663 if (!buffer_uptodate(bh))
665 submit_bh(WRITE, bh);
668 static int submit_barrier_buffer(struct buffer_head *bh)
671 bh->b_end_io = reiserfs_end_ordered_io;
672 clear_buffer_dirty(bh);
673 if (!buffer_uptodate(bh))
675 return submit_bh(WRITE_BARRIER, bh);
678 static void check_barrier_completion(struct super_block *s,
679 struct buffer_head *bh)
681 if (buffer_eopnotsupp(bh)) {
682 clear_buffer_eopnotsupp(bh);
684 set_buffer_uptodate(bh);
685 set_buffer_dirty(bh);
686 sync_dirty_buffer(bh);
690 #define CHUNK_SIZE 32
691 struct buffer_chunk {
692 struct buffer_head *bh[CHUNK_SIZE];
696 static void write_chunk(struct buffer_chunk *chunk)
700 for (i = 0; i < chunk->nr; i++) {
701 submit_logged_buffer(chunk->bh[i]);
707 static void write_ordered_chunk(struct buffer_chunk *chunk)
711 for (i = 0; i < chunk->nr; i++) {
712 submit_ordered_buffer(chunk->bh[i]);
718 static int add_to_chunk(struct buffer_chunk *chunk, struct buffer_head *bh,
719 spinlock_t * lock, void (fn) (struct buffer_chunk *))
722 if (chunk->nr >= CHUNK_SIZE)
724 chunk->bh[chunk->nr++] = bh;
725 if (chunk->nr >= CHUNK_SIZE) {
736 static atomic_t nr_reiserfs_jh = ATOMIC_INIT(0);
737 static struct reiserfs_jh *alloc_jh(void)
739 struct reiserfs_jh *jh;
741 jh = kmalloc(sizeof(*jh), GFP_NOFS);
743 atomic_inc(&nr_reiserfs_jh);
751 * we want to free the jh when the buffer has been written
754 void reiserfs_free_jh(struct buffer_head *bh)
756 struct reiserfs_jh *jh;
760 bh->b_private = NULL;
762 list_del_init(&jh->list);
764 if (atomic_read(&nr_reiserfs_jh) <= 0)
766 atomic_dec(&nr_reiserfs_jh);
771 static inline int __add_jh(struct reiserfs_journal *j, struct buffer_head *bh,
774 struct reiserfs_jh *jh;
777 spin_lock(&j->j_dirty_buffers_lock);
778 if (!bh->b_private) {
779 spin_unlock(&j->j_dirty_buffers_lock);
783 list_del_init(&jh->list);
788 spin_lock(&j->j_dirty_buffers_lock);
789 /* buffer must be locked for __add_jh, should be able to have
790 * two adds at the same time
797 jh->jl = j->j_current_jl;
799 list_add_tail(&jh->list, &jh->jl->j_tail_bh_list);
801 list_add_tail(&jh->list, &jh->jl->j_bh_list);
803 spin_unlock(&j->j_dirty_buffers_lock);
807 int reiserfs_add_tail_list(struct inode *inode, struct buffer_head *bh)
809 return __add_jh(SB_JOURNAL(inode->i_sb), bh, 1);
811 int reiserfs_add_ordered_list(struct inode *inode, struct buffer_head *bh)
813 return __add_jh(SB_JOURNAL(inode->i_sb), bh, 0);
816 #define JH_ENTRY(l) list_entry((l), struct reiserfs_jh, list)
817 static int write_ordered_buffers(spinlock_t * lock,
818 struct reiserfs_journal *j,
819 struct reiserfs_journal_list *jl,
820 struct list_head *list)
822 struct buffer_head *bh;
823 struct reiserfs_jh *jh;
824 int ret = j->j_errno;
825 struct buffer_chunk chunk;
826 struct list_head tmp;
827 INIT_LIST_HEAD(&tmp);
831 while (!list_empty(list)) {
832 jh = JH_ENTRY(list->next);
835 if (test_set_buffer_locked(bh)) {
836 if (!buffer_dirty(bh)) {
837 list_del_init(&jh->list);
838 list_add(&jh->list, &tmp);
843 write_ordered_chunk(&chunk);
849 if (buffer_dirty(bh)) {
850 list_del_init(&jh->list);
851 list_add(&jh->list, &tmp);
852 add_to_chunk(&chunk, bh, lock, write_ordered_chunk);
854 reiserfs_free_jh(bh);
859 cond_resched_lock(lock);
863 write_ordered_chunk(&chunk);
866 while (!list_empty(&tmp)) {
867 jh = JH_ENTRY(tmp.prev);
870 reiserfs_free_jh(bh);
872 if (buffer_locked(bh)) {
877 if (!buffer_uptodate(bh)) {
880 /* ugly interaction with invalidatepage here.
881 * reiserfs_invalidate_page will pin any buffer that has a valid
882 * journal head from an older transaction. If someone else sets
883 * our buffer dirty after we write it in the first loop, and
884 * then someone truncates the page away, nobody will ever write
885 * the buffer. We're safe if we write the page one last time
886 * after freeing the journal header.
888 if (buffer_dirty(bh) && unlikely(bh->b_page->mapping == NULL)) {
890 ll_rw_block(WRITE, 1, &bh);
894 cond_resched_lock(lock);
900 static int flush_older_commits(struct super_block *s,
901 struct reiserfs_journal_list *jl)
903 struct reiserfs_journal *journal = SB_JOURNAL(s);
904 struct reiserfs_journal_list *other_jl;
905 struct reiserfs_journal_list *first_jl;
906 struct list_head *entry;
907 unsigned long trans_id = jl->j_trans_id;
908 unsigned long other_trans_id;
909 unsigned long first_trans_id;
913 * first we walk backwards to find the oldest uncommitted transation
916 entry = jl->j_list.prev;
918 other_jl = JOURNAL_LIST_ENTRY(entry);
919 if (entry == &journal->j_journal_list ||
920 atomic_read(&other_jl->j_older_commits_done))
924 entry = other_jl->j_list.prev;
927 /* if we didn't find any older uncommitted transactions, return now */
928 if (first_jl == jl) {
932 first_trans_id = first_jl->j_trans_id;
934 entry = &first_jl->j_list;
936 other_jl = JOURNAL_LIST_ENTRY(entry);
937 other_trans_id = other_jl->j_trans_id;
939 if (other_trans_id < trans_id) {
940 if (atomic_read(&other_jl->j_commit_left) != 0) {
941 flush_commit_list(s, other_jl, 0);
943 /* list we were called with is gone, return */
944 if (!journal_list_still_alive(s, trans_id))
947 /* the one we just flushed is gone, this means all
948 * older lists are also gone, so first_jl is no longer
949 * valid either. Go back to the beginning.
951 if (!journal_list_still_alive
952 (s, other_trans_id)) {
957 if (entry == &journal->j_journal_list)
965 int reiserfs_async_progress_wait(struct super_block *s)
968 struct reiserfs_journal *j = SB_JOURNAL(s);
969 if (atomic_read(&j->j_async_throttle))
970 blk_congestion_wait(WRITE, HZ / 10);
975 ** if this journal list still has commit blocks unflushed, send them to disk.
977 ** log areas must be flushed in order (transaction 2 can't commit before transaction 1)
978 ** Before the commit block can by written, every other log block must be safely on disk
981 static int flush_commit_list(struct super_block *s,
982 struct reiserfs_journal_list *jl, int flushall)
986 struct buffer_head *tbh = NULL;
987 unsigned long trans_id = jl->j_trans_id;
988 struct reiserfs_journal *journal = SB_JOURNAL(s);
993 reiserfs_check_lock_depth(s, "flush_commit_list");
995 if (atomic_read(&jl->j_older_commits_done)) {
1001 /* before we can put our commit blocks on disk, we have to make sure everyone older than
1002 ** us is on disk too
1004 BUG_ON(jl->j_len <= 0);
1005 BUG_ON(trans_id == journal->j_trans_id);
1007 get_journal_list(jl);
1009 if (flush_older_commits(s, jl) == 1) {
1010 /* list disappeared during flush_older_commits. return */
1015 /* make sure nobody is trying to flush this one at the same time */
1016 down(&jl->j_commit_lock);
1017 if (!journal_list_still_alive(s, trans_id)) {
1018 up(&jl->j_commit_lock);
1021 BUG_ON(jl->j_trans_id == 0);
1023 /* this commit is done, exit */
1024 if (atomic_read(&(jl->j_commit_left)) <= 0) {
1026 atomic_set(&(jl->j_older_commits_done), 1);
1028 up(&jl->j_commit_lock);
1032 if (!list_empty(&jl->j_bh_list)) {
1034 write_ordered_buffers(&journal->j_dirty_buffers_lock,
1035 journal, jl, &jl->j_bh_list);
1038 BUG_ON(!list_empty(&jl->j_bh_list));
1040 * for the description block and all the log blocks, submit any buffers
1041 * that haven't already reached the disk. Try to write at least 256
1042 * log blocks. later on, we will only wait on blocks that correspond
1043 * to this transaction, but while we're unplugging we might as well
1044 * get a chunk of data on there.
1046 atomic_inc(&journal->j_async_throttle);
1047 write_len = jl->j_len + 1;
1048 if (write_len < 256)
1050 for (i = 0 ; i < write_len ; i++) {
1051 bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) + (jl->j_start + i) %
1052 SB_ONDISK_JOURNAL_SIZE(s);
1053 tbh = journal_find_get_block(s, bn);
1055 if (buffer_dirty(tbh))
1056 ll_rw_block(WRITE, 1, &tbh) ;
1060 atomic_dec(&journal->j_async_throttle);
1062 /* We're skipping the commit if there's an error */
1063 if (retval || reiserfs_is_journal_aborted(journal))
1066 /* wait on everything written so far before writing the commit
1067 * if we are in barrier mode, send the commit down now
1069 barrier = reiserfs_barrier_flush(s);
1072 lock_buffer(jl->j_commit_bh);
1073 ret = submit_barrier_buffer(jl->j_commit_bh);
1074 if (ret == -EOPNOTSUPP) {
1075 set_buffer_uptodate(jl->j_commit_bh);
1080 for (i = 0; i < (jl->j_len + 1); i++) {
1081 bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) +
1082 (jl->j_start + i) % SB_ONDISK_JOURNAL_SIZE(s);
1083 tbh = journal_find_get_block(s, bn);
1084 wait_on_buffer(tbh);
1085 // since we're using ll_rw_blk above, it might have skipped over
1086 // a locked buffer. Double check here
1088 if (buffer_dirty(tbh)) /* redundant, sync_dirty_buffer() checks */
1089 sync_dirty_buffer(tbh);
1090 if (unlikely(!buffer_uptodate(tbh))) {
1091 #ifdef CONFIG_REISERFS_CHECK
1092 reiserfs_warning(s, "journal-601, buffer write failed");
1096 put_bh(tbh); /* once for journal_find_get_block */
1097 put_bh(tbh); /* once due to original getblk in do_journal_end */
1098 atomic_dec(&(jl->j_commit_left));
1101 BUG_ON(atomic_read(&(jl->j_commit_left)) != 1);
1104 /* If there was a write error in the journal - we can't commit
1105 * this transaction - it will be invalid and, if successful,
1106 * will just end up propogating the write error out to
1107 * the file system. */
1108 if (likely(!retval && !reiserfs_is_journal_aborted (journal))) {
1109 if (buffer_dirty(jl->j_commit_bh))
1111 mark_buffer_dirty(jl->j_commit_bh) ;
1112 sync_dirty_buffer(jl->j_commit_bh) ;
1115 wait_on_buffer(jl->j_commit_bh);
1117 check_barrier_completion(s, jl->j_commit_bh);
1119 /* If there was a write error in the journal - we can't commit this
1120 * transaction - it will be invalid and, if successful, will just end
1121 * up propogating the write error out to the filesystem. */
1122 if (unlikely(!buffer_uptodate(jl->j_commit_bh))) {
1123 #ifdef CONFIG_REISERFS_CHECK
1124 reiserfs_warning(s, "journal-615: buffer write failed");
1128 bforget(jl->j_commit_bh);
1129 if (journal->j_last_commit_id != 0 &&
1130 (jl->j_trans_id - journal->j_last_commit_id) != 1) {
1131 reiserfs_warning(s, "clm-2200: last commit %lu, current %lu",
1132 journal->j_last_commit_id, jl->j_trans_id);
1134 journal->j_last_commit_id = jl->j_trans_id;
1136 /* now, every commit block is on the disk. It is safe to allow blocks freed during this transaction to be reallocated */
1137 cleanup_freed_for_journal_list(s, jl);
1139 retval = retval ? retval : journal->j_errno;
1141 /* mark the metadata dirty */
1143 dirty_one_transaction(s, jl);
1144 atomic_dec(&(jl->j_commit_left));
1147 atomic_set(&(jl->j_older_commits_done), 1);
1149 up(&jl->j_commit_lock);
1151 put_journal_list(s, jl);
1154 reiserfs_abort(s, retval, "Journal write error in %s",
1161 ** flush_journal_list frequently needs to find a newer transaction for a given block. This does that, or
1162 ** returns NULL if it can't find anything
1164 static struct reiserfs_journal_list *find_newer_jl_for_cn(struct
1165 reiserfs_journal_cnode
1168 struct super_block *sb = cn->sb;
1169 b_blocknr_t blocknr = cn->blocknr;
1173 if (cn->sb == sb && cn->blocknr == blocknr && cn->jlist) {
1181 static void remove_journal_hash(struct super_block *,
1182 struct reiserfs_journal_cnode **,
1183 struct reiserfs_journal_list *, unsigned long,
1187 ** once all the real blocks have been flushed, it is safe to remove them from the
1188 ** journal list for this transaction. Aside from freeing the cnode, this also allows the
1189 ** block to be reallocated for data blocks if it had been deleted.
1191 static void remove_all_from_journal_list(struct super_block *p_s_sb,
1192 struct reiserfs_journal_list *jl,
1195 struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
1196 struct reiserfs_journal_cnode *cn, *last;
1197 cn = jl->j_realblock;
1199 /* which is better, to lock once around the whole loop, or
1200 ** to lock for each call to remove_journal_hash?
1203 if (cn->blocknr != 0) {
1205 reiserfs_warning(p_s_sb,
1206 "block %u, bh is %d, state %ld",
1207 cn->blocknr, cn->bh ? 1 : 0,
1211 remove_journal_hash(p_s_sb, journal->j_list_hash_table,
1212 jl, cn->blocknr, 1);
1216 free_cnode(p_s_sb, last);
1218 jl->j_realblock = NULL;
1222 ** if this timestamp is greater than the timestamp we wrote last to the header block, write it to the header block.
1223 ** once this is done, I can safely say the log area for this transaction won't ever be replayed, and I can start
1224 ** releasing blocks in this transaction for reuse as data blocks.
1225 ** called by flush_journal_list, before it calls remove_all_from_journal_list
1228 static int _update_journal_header_block(struct super_block *p_s_sb,
1229 unsigned long offset,
1230 unsigned long trans_id)
1232 struct reiserfs_journal_header *jh;
1233 struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
1235 if (reiserfs_is_journal_aborted(journal))
1238 if (trans_id >= journal->j_last_flush_trans_id) {
1239 if (buffer_locked((journal->j_header_bh))) {
1240 wait_on_buffer((journal->j_header_bh));
1241 if (unlikely(!buffer_uptodate(journal->j_header_bh))) {
1242 #ifdef CONFIG_REISERFS_CHECK
1243 reiserfs_warning(p_s_sb,
1244 "journal-699: buffer write failed");
1249 journal->j_last_flush_trans_id = trans_id;
1250 journal->j_first_unflushed_offset = offset;
1251 jh = (struct reiserfs_journal_header *)(journal->j_header_bh->
1253 jh->j_last_flush_trans_id = cpu_to_le32(trans_id);
1254 jh->j_first_unflushed_offset = cpu_to_le32(offset);
1255 jh->j_mount_id = cpu_to_le32(journal->j_mount_id);
1257 if (reiserfs_barrier_flush(p_s_sb)) {
1259 lock_buffer(journal->j_header_bh);
1260 ret = submit_barrier_buffer(journal->j_header_bh);
1261 if (ret == -EOPNOTSUPP) {
1262 set_buffer_uptodate(journal->j_header_bh);
1263 disable_barrier(p_s_sb);
1266 wait_on_buffer(journal->j_header_bh);
1267 check_barrier_completion(p_s_sb, journal->j_header_bh);
1270 set_buffer_dirty(journal->j_header_bh);
1271 sync_dirty_buffer(journal->j_header_bh);
1273 if (!buffer_uptodate(journal->j_header_bh)) {
1274 reiserfs_warning(p_s_sb,
1275 "journal-837: IO error during journal replay");
1282 static int update_journal_header_block(struct super_block *p_s_sb,
1283 unsigned long offset,
1284 unsigned long trans_id)
1286 return _update_journal_header_block(p_s_sb, offset, trans_id);
1290 ** flush any and all journal lists older than you are
1291 ** can only be called from flush_journal_list
1293 static int flush_older_journal_lists(struct super_block *p_s_sb,
1294 struct reiserfs_journal_list *jl)
1296 struct list_head *entry;
1297 struct reiserfs_journal_list *other_jl;
1298 struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
1299 unsigned long trans_id = jl->j_trans_id;
1301 /* we know we are the only ones flushing things, no extra race
1302 * protection is required.
1305 entry = journal->j_journal_list.next;
1307 if (entry == &journal->j_journal_list)
1309 other_jl = JOURNAL_LIST_ENTRY(entry);
1310 if (other_jl->j_trans_id < trans_id) {
1311 BUG_ON(other_jl->j_refcount <= 0);
1312 /* do not flush all */
1313 flush_journal_list(p_s_sb, other_jl, 0);
1315 /* other_jl is now deleted from the list */
1321 static void del_from_work_list(struct super_block *s,
1322 struct reiserfs_journal_list *jl)
1324 struct reiserfs_journal *journal = SB_JOURNAL(s);
1325 if (!list_empty(&jl->j_working_list)) {
1326 list_del_init(&jl->j_working_list);
1327 journal->j_num_work_lists--;
1331 /* flush a journal list, both commit and real blocks
1333 ** always set flushall to 1, unless you are calling from inside
1334 ** flush_journal_list
1336 ** IMPORTANT. This can only be called while there are no journal writers,
1337 ** and the journal is locked. That means it can only be called from
1338 ** do_journal_end, or by journal_release
1340 static int flush_journal_list(struct super_block *s,
1341 struct reiserfs_journal_list *jl, int flushall)
1343 struct reiserfs_journal_list *pjl;
1344 struct reiserfs_journal_cnode *cn, *last;
1348 struct buffer_head *saved_bh;
1349 unsigned long j_len_saved = jl->j_len;
1350 struct reiserfs_journal *journal = SB_JOURNAL(s);
1353 BUG_ON(j_len_saved <= 0);
1355 if (atomic_read(&journal->j_wcount) != 0) {
1357 "clm-2048: flush_journal_list called with wcount %d",
1358 atomic_read(&journal->j_wcount));
1360 BUG_ON(jl->j_trans_id == 0);
1362 /* if flushall == 0, the lock is already held */
1364 down(&journal->j_flush_sem);
1365 } else if (!down_trylock(&journal->j_flush_sem)) {
1370 if (j_len_saved > journal->j_trans_max) {
1372 "journal-715: flush_journal_list, length is %lu, trans id %lu\n",
1373 j_len_saved, jl->j_trans_id);
1379 /* if all the work is already done, get out of here */
1380 if (atomic_read(&(jl->j_nonzerolen)) <= 0 &&
1381 atomic_read(&(jl->j_commit_left)) <= 0) {
1382 goto flush_older_and_return;
1385 /* start by putting the commit list on disk. This will also flush
1386 ** the commit lists of any olders transactions
1388 flush_commit_list(s, jl, 1);
1390 if (!(jl->j_state & LIST_DIRTY)
1391 && !reiserfs_is_journal_aborted(journal))
1394 /* are we done now? */
1395 if (atomic_read(&(jl->j_nonzerolen)) <= 0 &&
1396 atomic_read(&(jl->j_commit_left)) <= 0) {
1397 goto flush_older_and_return;
1400 /* loop through each cnode, see if we need to write it,
1401 ** or wait on a more recent transaction, or just ignore it
1403 if (atomic_read(&(journal->j_wcount)) != 0) {
1405 "journal-844: panic journal list is flushing, wcount is not 0\n");
1407 cn = jl->j_realblock;
1412 /* blocknr of 0 is no longer in the hash, ignore it */
1413 if (cn->blocknr == 0) {
1417 /* This transaction failed commit. Don't write out to the disk */
1418 if (!(jl->j_state & LIST_DIRTY))
1421 pjl = find_newer_jl_for_cn(cn);
1422 /* the order is important here. We check pjl to make sure we
1423 ** don't clear BH_JDirty_wait if we aren't the one writing this
1426 if (!pjl && cn->bh) {
1429 /* we do this to make sure nobody releases the buffer while
1430 ** we are working with it
1434 if (buffer_journal_dirty(saved_bh)) {
1435 BUG_ON(!can_dirty(cn));
1438 } else if (can_dirty(cn)) {
1439 /* everything with !pjl && jwait should be writable */
1444 /* if someone has this block in a newer transaction, just make
1445 ** sure they are commited, and don't try writing it to disk
1448 if (atomic_read(&pjl->j_commit_left))
1449 flush_commit_list(s, pjl, 1);
1453 /* bh == NULL when the block got to disk on its own, OR,
1454 ** the block got freed in a future transaction
1456 if (saved_bh == NULL) {
1460 /* this should never happen. kupdate_one_transaction has this list
1461 ** locked while it works, so we should never see a buffer here that
1462 ** is not marked JDirty_wait
1464 if ((!was_jwait) && !buffer_locked(saved_bh)) {
1466 "journal-813: BAD! buffer %llu %cdirty %cjwait, "
1467 "not in a newer tranasction",
1468 (unsigned long long)saved_bh->
1469 b_blocknr, was_dirty ? ' ' : '!',
1470 was_jwait ? ' ' : '!');
1473 /* we inc again because saved_bh gets decremented at free_cnode */
1475 set_bit(BLOCK_NEEDS_FLUSH, &cn->state);
1476 lock_buffer(saved_bh);
1477 BUG_ON(cn->blocknr != saved_bh->b_blocknr);
1478 if (buffer_dirty(saved_bh))
1479 submit_logged_buffer(saved_bh);
1481 unlock_buffer(saved_bh);
1485 "clm-2082: Unable to flush buffer %llu in %s",
1486 (unsigned long long)saved_bh->
1487 b_blocknr, __FUNCTION__);
1493 /* we incremented this to keep others from taking the buffer head away */
1495 if (atomic_read(&(saved_bh->b_count)) < 0) {
1497 "journal-945: saved_bh->b_count < 0");
1502 cn = jl->j_realblock;
1504 if (test_bit(BLOCK_NEEDS_FLUSH, &cn->state)) {
1507 "journal-1011: cn->bh is NULL\n");
1509 wait_on_buffer(cn->bh);
1512 "journal-1012: cn->bh is NULL\n");
1514 if (unlikely(!buffer_uptodate(cn->bh))) {
1515 #ifdef CONFIG_REISERFS_CHECK
1517 "journal-949: buffer write failed\n");
1521 /* note, we must clear the JDirty_wait bit after the up to date
1522 ** check, otherwise we race against our flushpage routine
1524 BUG_ON(!test_clear_buffer_journal_dirty
1527 /* undo the inc from journal_mark_dirty */
1536 reiserfs_abort(s, -EIO,
1537 "Write error while pushing transaction to disk in %s",
1539 flush_older_and_return:
1541 /* before we can update the journal header block, we _must_ flush all
1542 ** real blocks from all older transactions to disk. This is because
1543 ** once the header block is updated, this transaction will not be
1544 ** replayed after a crash
1547 flush_older_journal_lists(s, jl);
1550 err = journal->j_errno;
1551 /* before we can remove everything from the hash tables for this
1552 ** transaction, we must make sure it can never be replayed
1554 ** since we are only called from do_journal_end, we know for sure there
1555 ** are no allocations going on while we are flushing journal lists. So,
1556 ** we only need to update the journal header block for the last list
1559 if (!err && flushall) {
1561 update_journal_header_block(s,
1562 (jl->j_start + jl->j_len +
1563 2) % SB_ONDISK_JOURNAL_SIZE(s),
1566 reiserfs_abort(s, -EIO,
1567 "Write error while updating journal header in %s",
1570 remove_all_from_journal_list(s, jl, 0);
1571 list_del_init(&jl->j_list);
1572 journal->j_num_lists--;
1573 del_from_work_list(s, jl);
1575 if (journal->j_last_flush_id != 0 &&
1576 (jl->j_trans_id - journal->j_last_flush_id) != 1) {
1577 reiserfs_warning(s, "clm-2201: last flush %lu, current %lu",
1578 journal->j_last_flush_id, jl->j_trans_id);
1580 journal->j_last_flush_id = jl->j_trans_id;
1582 /* not strictly required since we are freeing the list, but it should
1583 * help find code using dead lists later on
1586 atomic_set(&(jl->j_nonzerolen), 0);
1588 jl->j_realblock = NULL;
1589 jl->j_commit_bh = NULL;
1592 put_journal_list(s, jl);
1594 up(&journal->j_flush_sem);
1599 static int write_one_transaction(struct super_block *s,
1600 struct reiserfs_journal_list *jl,
1601 struct buffer_chunk *chunk)
1603 struct reiserfs_journal_cnode *cn;
1606 jl->j_state |= LIST_TOUCHED;
1607 del_from_work_list(s, jl);
1608 if (jl->j_len == 0 || atomic_read(&jl->j_nonzerolen) == 0) {
1612 cn = jl->j_realblock;
1614 /* if the blocknr == 0, this has been cleared from the hash,
1617 if (cn->blocknr == 0) {
1620 if (cn->bh && can_dirty(cn) && buffer_dirty(cn->bh)) {
1621 struct buffer_head *tmp_bh;
1622 /* we can race against journal_mark_freed when we try
1623 * to lock_buffer(cn->bh), so we have to inc the buffer
1624 * count, and recheck things after locking
1628 lock_buffer(tmp_bh);
1629 if (cn->bh && can_dirty(cn) && buffer_dirty(tmp_bh)) {
1630 if (!buffer_journal_dirty(tmp_bh) ||
1631 buffer_journal_prepared(tmp_bh))
1633 add_to_chunk(chunk, tmp_bh, NULL, write_chunk);
1636 /* note, cn->bh might be null now */
1637 unlock_buffer(tmp_bh);
1648 /* used by flush_commit_list */
1649 static int dirty_one_transaction(struct super_block *s,
1650 struct reiserfs_journal_list *jl)
1652 struct reiserfs_journal_cnode *cn;
1653 struct reiserfs_journal_list *pjl;
1656 jl->j_state |= LIST_DIRTY;
1657 cn = jl->j_realblock;
1659 /* look for a more recent transaction that logged this
1660 ** buffer. Only the most recent transaction with a buffer in
1661 ** it is allowed to send that buffer to disk
1663 pjl = find_newer_jl_for_cn(cn);
1664 if (!pjl && cn->blocknr && cn->bh
1665 && buffer_journal_dirty(cn->bh)) {
1666 BUG_ON(!can_dirty(cn));
1667 /* if the buffer is prepared, it will either be logged
1668 * or restored. If restored, we need to make sure
1669 * it actually gets marked dirty
1671 clear_buffer_journal_new(cn->bh);
1672 if (buffer_journal_prepared(cn->bh)) {
1673 set_buffer_journal_restore_dirty(cn->bh);
1675 set_buffer_journal_test(cn->bh);
1676 mark_buffer_dirty(cn->bh);
1684 static int kupdate_transactions(struct super_block *s,
1685 struct reiserfs_journal_list *jl,
1686 struct reiserfs_journal_list **next_jl,
1687 unsigned long *next_trans_id,
1688 int num_blocks, int num_trans)
1692 int transactions_flushed = 0;
1693 unsigned long orig_trans_id = jl->j_trans_id;
1694 struct buffer_chunk chunk;
1695 struct list_head *entry;
1696 struct reiserfs_journal *journal = SB_JOURNAL(s);
1699 down(&journal->j_flush_sem);
1700 if (!journal_list_still_alive(s, orig_trans_id)) {
1704 /* we've got j_flush_sem held, nobody is going to delete any
1705 * of these lists out from underneath us
1707 while ((num_trans && transactions_flushed < num_trans) ||
1708 (!num_trans && written < num_blocks)) {
1710 if (jl->j_len == 0 || (jl->j_state & LIST_TOUCHED) ||
1711 atomic_read(&jl->j_commit_left)
1712 || !(jl->j_state & LIST_DIRTY)) {
1713 del_from_work_list(s, jl);
1716 ret = write_one_transaction(s, jl, &chunk);
1720 transactions_flushed++;
1722 entry = jl->j_list.next;
1725 if (entry == &journal->j_journal_list) {
1728 jl = JOURNAL_LIST_ENTRY(entry);
1730 /* don't bother with older transactions */
1731 if (jl->j_trans_id <= orig_trans_id)
1735 write_chunk(&chunk);
1739 up(&journal->j_flush_sem);
1743 /* for o_sync and fsync heavy applications, they tend to use
1744 ** all the journa list slots with tiny transactions. These
1745 ** trigger lots and lots of calls to update the header block, which
1746 ** adds seeks and slows things down.
1748 ** This function tries to clear out a large chunk of the journal lists
1749 ** at once, which makes everything faster since only the newest journal
1750 ** list updates the header block
1752 static int flush_used_journal_lists(struct super_block *s,
1753 struct reiserfs_journal_list *jl)
1755 unsigned long len = 0;
1756 unsigned long cur_len;
1760 struct reiserfs_journal_list *tjl;
1761 struct reiserfs_journal_list *flush_jl;
1762 unsigned long trans_id;
1763 struct reiserfs_journal *journal = SB_JOURNAL(s);
1765 flush_jl = tjl = jl;
1767 /* in data logging mode, try harder to flush a lot of blocks */
1768 if (reiserfs_data_log(s))
1770 /* flush for 256 transactions or limit blocks, whichever comes first */
1771 for (i = 0; i < 256 && len < limit; i++) {
1772 if (atomic_read(&tjl->j_commit_left) ||
1773 tjl->j_trans_id < jl->j_trans_id) {
1776 cur_len = atomic_read(&tjl->j_nonzerolen);
1778 tjl->j_state &= ~LIST_TOUCHED;
1782 if (tjl->j_list.next == &journal->j_journal_list)
1784 tjl = JOURNAL_LIST_ENTRY(tjl->j_list.next);
1786 /* try to find a group of blocks we can flush across all the
1787 ** transactions, but only bother if we've actually spanned
1788 ** across multiple lists
1790 if (flush_jl != jl) {
1791 ret = kupdate_transactions(s, jl, &tjl, &trans_id, len, i);
1793 flush_journal_list(s, flush_jl, 1);
1798 ** removes any nodes in table with name block and dev as bh.
1799 ** only touchs the hnext and hprev pointers.
1801 void remove_journal_hash(struct super_block *sb,
1802 struct reiserfs_journal_cnode **table,
1803 struct reiserfs_journal_list *jl,
1804 unsigned long block, int remove_freed)
1806 struct reiserfs_journal_cnode *cur;
1807 struct reiserfs_journal_cnode **head;
1809 head = &(journal_hash(table, sb, block));
1815 if (cur->blocknr == block && cur->sb == sb
1816 && (jl == NULL || jl == cur->jlist)
1817 && (!test_bit(BLOCK_FREED, &cur->state) || remove_freed)) {
1819 cur->hnext->hprev = cur->hprev;
1822 cur->hprev->hnext = cur->hnext;
1829 if (cur->bh && cur->jlist) /* anybody who clears the cur->bh will also dec the nonzerolen */
1830 atomic_dec(&(cur->jlist->j_nonzerolen));
1838 static void free_journal_ram(struct super_block *p_s_sb)
1840 struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
1841 kfree(journal->j_current_jl);
1842 journal->j_num_lists--;
1844 vfree(journal->j_cnode_free_orig);
1845 free_list_bitmaps(p_s_sb, journal->j_list_bitmap);
1846 free_bitmap_nodes(p_s_sb); /* must be after free_list_bitmaps */
1847 if (journal->j_header_bh) {
1848 brelse(journal->j_header_bh);
1850 /* j_header_bh is on the journal dev, make sure not to release the journal
1851 * dev until we brelse j_header_bh
1853 release_journal_dev(p_s_sb, journal);
1858 ** call on unmount. Only set error to 1 if you haven't made your way out
1859 ** of read_super() yet. Any other caller must keep error at 0.
1861 static int do_journal_release(struct reiserfs_transaction_handle *th,
1862 struct super_block *p_s_sb, int error)
1864 struct reiserfs_transaction_handle myth;
1866 struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
1868 /* we only want to flush out transactions if we were called with error == 0
1870 if (!error && !(p_s_sb->s_flags & MS_RDONLY)) {
1871 /* end the current trans */
1872 BUG_ON(!th->t_trans_id);
1873 do_journal_end(th, p_s_sb, 10, FLUSH_ALL);
1875 /* make sure something gets logged to force our way into the flush code */
1876 if (!journal_join(&myth, p_s_sb, 1)) {
1877 reiserfs_prepare_for_journal(p_s_sb,
1878 SB_BUFFER_WITH_SB(p_s_sb),
1880 journal_mark_dirty(&myth, p_s_sb,
1881 SB_BUFFER_WITH_SB(p_s_sb));
1882 do_journal_end(&myth, p_s_sb, 1, FLUSH_ALL);
1887 /* this also catches errors during the do_journal_end above */
1888 if (!error && reiserfs_is_journal_aborted(journal)) {
1889 memset(&myth, 0, sizeof(myth));
1890 if (!journal_join_abort(&myth, p_s_sb, 1)) {
1891 reiserfs_prepare_for_journal(p_s_sb,
1892 SB_BUFFER_WITH_SB(p_s_sb),
1894 journal_mark_dirty(&myth, p_s_sb,
1895 SB_BUFFER_WITH_SB(p_s_sb));
1896 do_journal_end(&myth, p_s_sb, 1, FLUSH_ALL);
1900 reiserfs_mounted_fs_count--;
1901 /* wait for all commits to finish */
1902 cancel_delayed_work(&SB_JOURNAL(p_s_sb)->j_work);
1903 flush_workqueue(commit_wq);
1904 if (!reiserfs_mounted_fs_count) {
1905 destroy_workqueue(commit_wq);
1909 free_journal_ram(p_s_sb);
1915 ** call on unmount. flush all journal trans, release all alloc'd ram
1917 int journal_release(struct reiserfs_transaction_handle *th,
1918 struct super_block *p_s_sb)
1920 return do_journal_release(th, p_s_sb, 0);
1924 ** only call from an error condition inside reiserfs_read_super!
1926 int journal_release_error(struct reiserfs_transaction_handle *th,
1927 struct super_block *p_s_sb)
1929 return do_journal_release(th, p_s_sb, 1);
1932 /* compares description block with commit block. returns 1 if they differ, 0 if they are the same */
1933 static int journal_compare_desc_commit(struct super_block *p_s_sb,
1934 struct reiserfs_journal_desc *desc,
1935 struct reiserfs_journal_commit *commit)
1937 if (get_commit_trans_id(commit) != get_desc_trans_id(desc) ||
1938 get_commit_trans_len(commit) != get_desc_trans_len(desc) ||
1939 get_commit_trans_len(commit) > SB_JOURNAL(p_s_sb)->j_trans_max ||
1940 get_commit_trans_len(commit) <= 0) {
1946 /* returns 0 if it did not find a description block
1947 ** returns -1 if it found a corrupt commit block
1948 ** returns 1 if both desc and commit were valid
1950 static int journal_transaction_is_valid(struct super_block *p_s_sb,
1951 struct buffer_head *d_bh,
1952 unsigned long *oldest_invalid_trans_id,
1953 unsigned long *newest_mount_id)
1955 struct reiserfs_journal_desc *desc;
1956 struct reiserfs_journal_commit *commit;
1957 struct buffer_head *c_bh;
1958 unsigned long offset;
1963 desc = (struct reiserfs_journal_desc *)d_bh->b_data;
1964 if (get_desc_trans_len(desc) > 0
1965 && !memcmp(get_journal_desc_magic(d_bh), JOURNAL_DESC_MAGIC, 8)) {
1966 if (oldest_invalid_trans_id && *oldest_invalid_trans_id
1967 && get_desc_trans_id(desc) > *oldest_invalid_trans_id) {
1968 reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE,
1969 "journal-986: transaction "
1970 "is valid returning because trans_id %d is greater than "
1971 "oldest_invalid %lu",
1972 get_desc_trans_id(desc),
1973 *oldest_invalid_trans_id);
1977 && *newest_mount_id > get_desc_mount_id(desc)) {
1978 reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE,
1979 "journal-1087: transaction "
1980 "is valid returning because mount_id %d is less than "
1981 "newest_mount_id %lu",
1982 get_desc_mount_id(desc),
1986 if (get_desc_trans_len(desc) > SB_JOURNAL(p_s_sb)->j_trans_max) {
1987 reiserfs_warning(p_s_sb,
1988 "journal-2018: Bad transaction length %d encountered, ignoring transaction",
1989 get_desc_trans_len(desc));
1992 offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb);
1994 /* ok, we have a journal description block, lets see if the transaction was valid */
1996 journal_bread(p_s_sb,
1997 SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) +
1998 ((offset + get_desc_trans_len(desc) +
1999 1) % SB_ONDISK_JOURNAL_SIZE(p_s_sb)));
2002 commit = (struct reiserfs_journal_commit *)c_bh->b_data;
2003 if (journal_compare_desc_commit(p_s_sb, desc, commit)) {
2004 reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE,
2005 "journal_transaction_is_valid, commit offset %ld had bad "
2006 "time %d or length %d",
2008 SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb),
2009 get_commit_trans_id(commit),
2010 get_commit_trans_len(commit));
2012 if (oldest_invalid_trans_id) {
2013 *oldest_invalid_trans_id =
2014 get_desc_trans_id(desc);
2015 reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE,
2017 "transaction_is_valid setting oldest invalid trans_id "
2019 get_desc_trans_id(desc));
2024 reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE,
2025 "journal-1006: found valid "
2026 "transaction start offset %llu, len %d id %d",
2028 SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb),
2029 get_desc_trans_len(desc),
2030 get_desc_trans_id(desc));
2037 static void brelse_array(struct buffer_head **heads, int num)
2040 for (i = 0; i < num; i++) {
2046 ** given the start, and values for the oldest acceptable transactions,
2047 ** this either reads in a replays a transaction, or returns because the transaction
2048 ** is invalid, or too old.
2050 static int journal_read_transaction(struct super_block *p_s_sb,
2051 unsigned long cur_dblock,
2052 unsigned long oldest_start,
2053 unsigned long oldest_trans_id,
2054 unsigned long newest_mount_id)
2056 struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
2057 struct reiserfs_journal_desc *desc;
2058 struct reiserfs_journal_commit *commit;
2059 unsigned long trans_id = 0;
2060 struct buffer_head *c_bh;
2061 struct buffer_head *d_bh;
2062 struct buffer_head **log_blocks = NULL;
2063 struct buffer_head **real_blocks = NULL;
2064 unsigned long trans_offset;
2068 d_bh = journal_bread(p_s_sb, cur_dblock);
2071 desc = (struct reiserfs_journal_desc *)d_bh->b_data;
2072 trans_offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb);
2073 reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1037: "
2074 "journal_read_transaction, offset %llu, len %d mount_id %d",
2075 d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb),
2076 get_desc_trans_len(desc), get_desc_mount_id(desc));
2077 if (get_desc_trans_id(desc) < oldest_trans_id) {
2078 reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1039: "
2079 "journal_read_trans skipping because %lu is too old",
2081 SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb));
2085 if (get_desc_mount_id(desc) != newest_mount_id) {
2086 reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1146: "
2087 "journal_read_trans skipping because %d is != "
2088 "newest_mount_id %lu", get_desc_mount_id(desc),
2093 c_bh = journal_bread(p_s_sb, SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) +
2094 ((trans_offset + get_desc_trans_len(desc) + 1) %
2095 SB_ONDISK_JOURNAL_SIZE(p_s_sb)));
2100 commit = (struct reiserfs_journal_commit *)c_bh->b_data;
2101 if (journal_compare_desc_commit(p_s_sb, desc, commit)) {
2102 reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE,
2103 "journal_read_transaction, "
2104 "commit offset %llu had bad time %d or length %d",
2106 SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb),
2107 get_commit_trans_id(commit),
2108 get_commit_trans_len(commit));
2113 trans_id = get_desc_trans_id(desc);
2114 /* now we know we've got a good transaction, and it was inside the valid time ranges */
2115 log_blocks = kmalloc(get_desc_trans_len(desc) *
2116 sizeof(struct buffer_head *), GFP_NOFS);
2117 real_blocks = kmalloc(get_desc_trans_len(desc) *
2118 sizeof(struct buffer_head *), GFP_NOFS);
2119 if (!log_blocks || !real_blocks) {
2124 reiserfs_warning(p_s_sb,
2125 "journal-1169: kmalloc failed, unable to mount FS");
2128 /* get all the buffer heads */
2129 trans_half = journal_trans_half(p_s_sb->s_blocksize);
2130 for (i = 0; i < get_desc_trans_len(desc); i++) {
2132 journal_getblk(p_s_sb,
2133 SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) +
2135 i) % SB_ONDISK_JOURNAL_SIZE(p_s_sb));
2136 if (i < trans_half) {
2139 le32_to_cpu(desc->j_realblock[i]));
2143 le32_to_cpu(commit->
2144 j_realblock[i - trans_half]));
2146 if (real_blocks[i]->b_blocknr > SB_BLOCK_COUNT(p_s_sb)) {
2147 reiserfs_warning(p_s_sb,
2148 "journal-1207: REPLAY FAILURE fsck required! Block to replay is outside of filesystem");
2151 /* make sure we don't try to replay onto log or reserved area */
2152 if (is_block_in_log_or_reserved_area
2153 (p_s_sb, real_blocks[i]->b_blocknr)) {
2154 reiserfs_warning(p_s_sb,
2155 "journal-1204: REPLAY FAILURE fsck required! Trying to replay onto a log block");
2157 brelse_array(log_blocks, i);
2158 brelse_array(real_blocks, i);
2166 /* read in the log blocks, memcpy to the corresponding real block */
2167 ll_rw_block(READ, get_desc_trans_len(desc), log_blocks);
2168 for (i = 0; i < get_desc_trans_len(desc); i++) {
2169 wait_on_buffer(log_blocks[i]);
2170 if (!buffer_uptodate(log_blocks[i])) {
2171 reiserfs_warning(p_s_sb,
2172 "journal-1212: REPLAY FAILURE fsck required! buffer write failed");
2173 brelse_array(log_blocks + i,
2174 get_desc_trans_len(desc) - i);
2175 brelse_array(real_blocks, get_desc_trans_len(desc));
2182 memcpy(real_blocks[i]->b_data, log_blocks[i]->b_data,
2183 real_blocks[i]->b_size);
2184 set_buffer_uptodate(real_blocks[i]);
2185 brelse(log_blocks[i]);
2187 /* flush out the real blocks */
2188 for (i = 0; i < get_desc_trans_len(desc); i++) {
2189 set_buffer_dirty(real_blocks[i]);
2190 ll_rw_block(SWRITE, 1, real_blocks + i);
2192 for (i = 0; i < get_desc_trans_len(desc); i++) {
2193 wait_on_buffer(real_blocks[i]);
2194 if (!buffer_uptodate(real_blocks[i])) {
2195 reiserfs_warning(p_s_sb,
2196 "journal-1226: REPLAY FAILURE, fsck required! buffer write failed");
2197 brelse_array(real_blocks + i,
2198 get_desc_trans_len(desc) - i);
2205 brelse(real_blocks[i]);
2208 SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) +
2209 ((trans_offset + get_desc_trans_len(desc) +
2210 2) % SB_ONDISK_JOURNAL_SIZE(p_s_sb));
2211 reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE,
2212 "journal-1095: setting journal " "start to offset %ld",
2213 cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb));
2215 /* init starting values for the first transaction, in case this is the last transaction to be replayed. */
2216 journal->j_start = cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb);
2217 journal->j_last_flush_trans_id = trans_id;
2218 journal->j_trans_id = trans_id + 1;
2226 /* This function reads blocks starting from block and to max_block of bufsize
2227 size (but no more than BUFNR blocks at a time). This proved to improve
2228 mounting speed on self-rebuilding raid5 arrays at least.
2229 Right now it is only used from journal code. But later we might use it
2231 Note: Do not use journal_getblk/sb_getblk functions here! */
2232 static struct buffer_head *reiserfs_breada(struct block_device *dev, int block,
2233 int bufsize, unsigned int max_block)
2235 struct buffer_head *bhlist[BUFNR];
2236 unsigned int blocks = BUFNR;
2237 struct buffer_head *bh;
2240 bh = __getblk(dev, block, bufsize);
2241 if (buffer_uptodate(bh))
2244 if (block + BUFNR > max_block) {
2245 blocks = max_block - block;
2249 for (i = 1; i < blocks; i++) {
2250 bh = __getblk(dev, block + i, bufsize);
2251 if (buffer_uptodate(bh)) {
2257 ll_rw_block(READ, j, bhlist);
2258 for (i = 1; i < j; i++)
2262 if (buffer_uptodate(bh))
2269 ** read and replay the log
2270 ** on a clean unmount, the journal header's next unflushed pointer will be to an invalid
2271 ** transaction. This tests that before finding all the transactions in the log, which makes normal mount times fast.
2273 ** After a crash, this starts with the next unflushed transaction, and replays until it finds one too old, or invalid.
2275 ** On exit, it sets things up so the first transaction will work correctly.
2277 static int journal_read(struct super_block *p_s_sb)
2279 struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
2280 struct reiserfs_journal_desc *desc;
2281 unsigned long oldest_trans_id = 0;
2282 unsigned long oldest_invalid_trans_id = 0;
2284 unsigned long oldest_start = 0;
2285 unsigned long cur_dblock = 0;
2286 unsigned long newest_mount_id = 9;
2287 struct buffer_head *d_bh;
2288 struct reiserfs_journal_header *jh;
2289 int valid_journal_header = 0;
2290 int replay_count = 0;
2291 int continue_replay = 1;
2293 char b[BDEVNAME_SIZE];
2295 cur_dblock = SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb);
2296 reiserfs_info(p_s_sb, "checking transaction log (%s)\n",
2297 bdevname(journal->j_dev_bd, b));
2298 start = get_seconds();
2300 /* step 1, read in the journal header block. Check the transaction it says
2301 ** is the first unflushed, and if that transaction is not valid,
2304 journal->j_header_bh = journal_bread(p_s_sb,
2305 SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb)
2306 + SB_ONDISK_JOURNAL_SIZE(p_s_sb));
2307 if (!journal->j_header_bh) {
2310 jh = (struct reiserfs_journal_header *)(journal->j_header_bh->b_data);
2311 if (le32_to_cpu(jh->j_first_unflushed_offset) >= 0 &&
2312 le32_to_cpu(jh->j_first_unflushed_offset) <
2313 SB_ONDISK_JOURNAL_SIZE(p_s_sb)
2314 && le32_to_cpu(jh->j_last_flush_trans_id) > 0) {
2316 SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) +
2317 le32_to_cpu(jh->j_first_unflushed_offset);
2318 oldest_trans_id = le32_to_cpu(jh->j_last_flush_trans_id) + 1;
2319 newest_mount_id = le32_to_cpu(jh->j_mount_id);
2320 reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE,
2321 "journal-1153: found in "
2322 "header: first_unflushed_offset %d, last_flushed_trans_id "
2323 "%lu", le32_to_cpu(jh->j_first_unflushed_offset),
2324 le32_to_cpu(jh->j_last_flush_trans_id));
2325 valid_journal_header = 1;
2327 /* now, we try to read the first unflushed offset. If it is not valid,
2328 ** there is nothing more we can do, and it makes no sense to read
2329 ** through the whole log.
2332 journal_bread(p_s_sb,
2333 SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) +
2334 le32_to_cpu(jh->j_first_unflushed_offset));
2335 ret = journal_transaction_is_valid(p_s_sb, d_bh, NULL, NULL);
2337 continue_replay = 0;
2340 goto start_log_replay;
2343 if (continue_replay && bdev_read_only(p_s_sb->s_bdev)) {
2344 reiserfs_warning(p_s_sb,
2345 "clm-2076: device is readonly, unable to replay log");
2349 /* ok, there are transactions that need to be replayed. start with the first log block, find
2350 ** all the valid transactions, and pick out the oldest.
2352 while (continue_replay
2354 (SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) +
2355 SB_ONDISK_JOURNAL_SIZE(p_s_sb))) {
2356 /* Note that it is required for blocksize of primary fs device and journal
2357 device to be the same */
2359 reiserfs_breada(journal->j_dev_bd, cur_dblock,
2360 p_s_sb->s_blocksize,
2361 SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) +
2362 SB_ONDISK_JOURNAL_SIZE(p_s_sb));
2364 journal_transaction_is_valid(p_s_sb, d_bh,
2365 &oldest_invalid_trans_id,
2368 desc = (struct reiserfs_journal_desc *)d_bh->b_data;
2369 if (oldest_start == 0) { /* init all oldest_ values */
2370 oldest_trans_id = get_desc_trans_id(desc);
2371 oldest_start = d_bh->b_blocknr;
2372 newest_mount_id = get_desc_mount_id(desc);
2373 reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE,
2374 "journal-1179: Setting "
2375 "oldest_start to offset %llu, trans_id %lu",
2377 SB_ONDISK_JOURNAL_1st_BLOCK
2378 (p_s_sb), oldest_trans_id);
2379 } else if (oldest_trans_id > get_desc_trans_id(desc)) {
2380 /* one we just read was older */
2381 oldest_trans_id = get_desc_trans_id(desc);
2382 oldest_start = d_bh->b_blocknr;
2383 reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE,
2384 "journal-1180: Resetting "
2385 "oldest_start to offset %lu, trans_id %lu",
2387 SB_ONDISK_JOURNAL_1st_BLOCK
2388 (p_s_sb), oldest_trans_id);
2390 if (newest_mount_id < get_desc_mount_id(desc)) {
2391 newest_mount_id = get_desc_mount_id(desc);
2392 reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE,
2393 "journal-1299: Setting "
2394 "newest_mount_id to %d",
2395 get_desc_mount_id(desc));
2397 cur_dblock += get_desc_trans_len(desc) + 2;
2405 cur_dblock = oldest_start;
2406 if (oldest_trans_id) {
2407 reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE,
2408 "journal-1206: Starting replay "
2409 "from offset %llu, trans_id %lu",
2410 cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb),
2415 while (continue_replay && oldest_trans_id > 0) {
2417 journal_read_transaction(p_s_sb, cur_dblock, oldest_start,
2418 oldest_trans_id, newest_mount_id);
2421 } else if (ret != 0) {
2425 SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) + journal->j_start;
2427 if (cur_dblock == oldest_start)
2431 if (oldest_trans_id == 0) {
2432 reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE,
2433 "journal-1225: No valid " "transactions found");
2435 /* j_start does not get set correctly if we don't replay any transactions.
2436 ** if we had a valid journal_header, set j_start to the first unflushed transaction value,
2437 ** copy the trans_id from the header
2439 if (valid_journal_header && replay_count == 0) {
2440 journal->j_start = le32_to_cpu(jh->j_first_unflushed_offset);
2441 journal->j_trans_id =
2442 le32_to_cpu(jh->j_last_flush_trans_id) + 1;
2443 journal->j_last_flush_trans_id =
2444 le32_to_cpu(jh->j_last_flush_trans_id);
2445 journal->j_mount_id = le32_to_cpu(jh->j_mount_id) + 1;
2447 journal->j_mount_id = newest_mount_id + 1;
2449 reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1299: Setting "
2450 "newest_mount_id to %lu", journal->j_mount_id);
2451 journal->j_first_unflushed_offset = journal->j_start;
2452 if (replay_count > 0) {
2453 reiserfs_info(p_s_sb,
2454 "replayed %d transactions in %lu seconds\n",
2455 replay_count, get_seconds() - start);
2457 if (!bdev_read_only(p_s_sb->s_bdev) &&
2458 _update_journal_header_block(p_s_sb, journal->j_start,
2459 journal->j_last_flush_trans_id)) {
2460 /* replay failed, caller must call free_journal_ram and abort
2468 static struct reiserfs_journal_list *alloc_journal_list(struct super_block *s)
2470 struct reiserfs_journal_list *jl;
2471 jl = kzalloc(sizeof(struct reiserfs_journal_list),
2472 GFP_NOFS | __GFP_NOFAIL);
2473 INIT_LIST_HEAD(&jl->j_list);
2474 INIT_LIST_HEAD(&jl->j_working_list);
2475 INIT_LIST_HEAD(&jl->j_tail_bh_list);
2476 INIT_LIST_HEAD(&jl->j_bh_list);
2477 sema_init(&jl->j_commit_lock, 1);
2478 SB_JOURNAL(s)->j_num_lists++;
2479 get_journal_list(jl);
2483 static void journal_list_init(struct super_block *p_s_sb)
2485 SB_JOURNAL(p_s_sb)->j_current_jl = alloc_journal_list(p_s_sb);
2488 static int release_journal_dev(struct super_block *super,
2489 struct reiserfs_journal *journal)
2495 if (journal->j_dev_file != NULL) {
2496 result = filp_close(journal->j_dev_file, NULL);
2497 journal->j_dev_file = NULL;
2498 journal->j_dev_bd = NULL;
2499 } else if (journal->j_dev_bd != NULL) {
2500 result = blkdev_put(journal->j_dev_bd);
2501 journal->j_dev_bd = NULL;
2505 reiserfs_warning(super,
2506 "sh-457: release_journal_dev: Cannot release journal device: %i",
2512 static int journal_init_dev(struct super_block *super,
2513 struct reiserfs_journal *journal,
2514 const char *jdev_name)
2518 int blkdev_mode = FMODE_READ | FMODE_WRITE;
2519 char b[BDEVNAME_SIZE];
2523 journal->j_dev_bd = NULL;
2524 journal->j_dev_file = NULL;
2525 jdev = SB_ONDISK_JOURNAL_DEVICE(super) ?
2526 new_decode_dev(SB_ONDISK_JOURNAL_DEVICE(super)) : super->s_dev;
2528 if (bdev_read_only(super->s_bdev))
2529 blkdev_mode = FMODE_READ;
2531 /* there is no "jdev" option and journal is on separate device */
2532 if ((!jdev_name || !jdev_name[0])) {
2533 journal->j_dev_bd = open_by_devnum(jdev, blkdev_mode);
2534 if (IS_ERR(journal->j_dev_bd)) {
2535 result = PTR_ERR(journal->j_dev_bd);
2536 journal->j_dev_bd = NULL;
2537 reiserfs_warning(super, "sh-458: journal_init_dev: "
2538 "cannot init journal device '%s': %i",
2539 __bdevname(jdev, b), result);
2541 } else if (jdev != super->s_dev)
2542 set_blocksize(journal->j_dev_bd, super->s_blocksize);
2546 journal->j_dev_file = filp_open(jdev_name, 0, 0);
2547 if (!IS_ERR(journal->j_dev_file)) {
2548 struct inode *jdev_inode = journal->j_dev_file->f_mapping->host;
2549 if (!S_ISBLK(jdev_inode->i_mode)) {
2550 reiserfs_warning(super, "journal_init_dev: '%s' is "
2551 "not a block device", jdev_name);
2553 release_journal_dev(super, journal);
2556 journal->j_dev_bd = I_BDEV(jdev_inode);
2557 set_blocksize(journal->j_dev_bd, super->s_blocksize);
2558 reiserfs_info(super,
2559 "journal_init_dev: journal device: %s\n",
2560 bdevname(journal->j_dev_bd, b));
2563 result = PTR_ERR(journal->j_dev_file);
2564 journal->j_dev_file = NULL;
2565 reiserfs_warning(super,
2566 "journal_init_dev: Cannot open '%s': %i",
2573 ** must be called once on fs mount. calls journal_read for you
2575 int journal_init(struct super_block *p_s_sb, const char *j_dev_name,
2576 int old_format, unsigned int commit_max_age)
2578 int num_cnodes = SB_ONDISK_JOURNAL_SIZE(p_s_sb) * 2;
2579 struct buffer_head *bhjh;
2580 struct reiserfs_super_block *rs;
2581 struct reiserfs_journal_header *jh;
2582 struct reiserfs_journal *journal;
2583 struct reiserfs_journal_list *jl;
2584 char b[BDEVNAME_SIZE];
2586 journal = SB_JOURNAL(p_s_sb) = vmalloc(sizeof(struct reiserfs_journal));
2588 reiserfs_warning(p_s_sb,
2589 "journal-1256: unable to get memory for journal structure");
2592 memset(journal, 0, sizeof(struct reiserfs_journal));
2593 INIT_LIST_HEAD(&journal->j_bitmap_nodes);
2594 INIT_LIST_HEAD(&journal->j_prealloc_list);
2595 INIT_LIST_HEAD(&journal->j_working_list);
2596 INIT_LIST_HEAD(&journal->j_journal_list);
2597 journal->j_persistent_trans = 0;
2598 if (reiserfs_allocate_list_bitmaps(p_s_sb,
2599 journal->j_list_bitmap,
2600 SB_BMAP_NR(p_s_sb)))
2601 goto free_and_return;
2602 allocate_bitmap_nodes(p_s_sb);
2604 /* reserved for journal area support */
2605 SB_JOURNAL_1st_RESERVED_BLOCK(p_s_sb) = (old_format ?
2606 REISERFS_OLD_DISK_OFFSET_IN_BYTES
2607 / p_s_sb->s_blocksize +
2608 SB_BMAP_NR(p_s_sb) +
2610 REISERFS_DISK_OFFSET_IN_BYTES /
2611 p_s_sb->s_blocksize + 2);
2613 /* Sanity check to see is the standard journal fitting withing first bitmap
2614 (actual for small blocksizes) */
2615 if (!SB_ONDISK_JOURNAL_DEVICE(p_s_sb) &&
2616 (SB_JOURNAL_1st_RESERVED_BLOCK(p_s_sb) +
2617 SB_ONDISK_JOURNAL_SIZE(p_s_sb) > p_s_sb->s_blocksize * 8)) {
2618 reiserfs_warning(p_s_sb,
2619 "journal-1393: journal does not fit for area "
2620 "addressed by first of bitmap blocks. It starts at "
2621 "%u and its size is %u. Block size %ld",
2622 SB_JOURNAL_1st_RESERVED_BLOCK(p_s_sb),
2623 SB_ONDISK_JOURNAL_SIZE(p_s_sb),
2624 p_s_sb->s_blocksize);
2625 goto free_and_return;
2628 if (journal_init_dev(p_s_sb, journal, j_dev_name) != 0) {
2629 reiserfs_warning(p_s_sb,
2630 "sh-462: unable to initialize jornal device");
2631 goto free_and_return;
2634 rs = SB_DISK_SUPER_BLOCK(p_s_sb);
2636 /* read journal header */
2637 bhjh = journal_bread(p_s_sb,
2638 SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) +
2639 SB_ONDISK_JOURNAL_SIZE(p_s_sb));
2641 reiserfs_warning(p_s_sb,
2642 "sh-459: unable to read journal header");
2643 goto free_and_return;
2645 jh = (struct reiserfs_journal_header *)(bhjh->b_data);
2647 /* make sure that journal matches to the super block */
2648 if (is_reiserfs_jr(rs)
2649 && (le32_to_cpu(jh->jh_journal.jp_journal_magic) !=
2650 sb_jp_journal_magic(rs))) {
2651 reiserfs_warning(p_s_sb,
2652 "sh-460: journal header magic %x "
2653 "(device %s) does not match to magic found in super "
2654 "block %x", jh->jh_journal.jp_journal_magic,
2655 bdevname(journal->j_dev_bd, b),
2656 sb_jp_journal_magic(rs));
2658 goto free_and_return;
2661 journal->j_trans_max = le32_to_cpu(jh->jh_journal.jp_journal_trans_max);
2662 journal->j_max_batch = le32_to_cpu(jh->jh_journal.jp_journal_max_batch);
2663 journal->j_max_commit_age =
2664 le32_to_cpu(jh->jh_journal.jp_journal_max_commit_age);
2665 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
2667 if (journal->j_trans_max) {
2668 /* make sure these parameters are available, assign it if they are not */
2669 __u32 initial = journal->j_trans_max;
2672 if (p_s_sb->s_blocksize < 4096)
2673 ratio = 4096 / p_s_sb->s_blocksize;
2675 if (SB_ONDISK_JOURNAL_SIZE(p_s_sb) / journal->j_trans_max <
2677 journal->j_trans_max =
2678 SB_ONDISK_JOURNAL_SIZE(p_s_sb) / JOURNAL_MIN_RATIO;
2679 if (journal->j_trans_max > JOURNAL_TRANS_MAX_DEFAULT / ratio)
2680 journal->j_trans_max =
2681 JOURNAL_TRANS_MAX_DEFAULT / ratio;
2682 if (journal->j_trans_max < JOURNAL_TRANS_MIN_DEFAULT / ratio)
2683 journal->j_trans_max =
2684 JOURNAL_TRANS_MIN_DEFAULT / ratio;
2686 if (journal->j_trans_max != initial)
2687 reiserfs_warning(p_s_sb,
2688 "sh-461: journal_init: wrong transaction max size (%u). Changed to %u",
2689 initial, journal->j_trans_max);
2691 journal->j_max_batch = journal->j_trans_max *
2692 JOURNAL_MAX_BATCH_DEFAULT / JOURNAL_TRANS_MAX_DEFAULT;
2695 if (!journal->j_trans_max) {
2696 /*we have the file system was created by old version of mkreiserfs
2697 so this field contains zero value */
2698 journal->j_trans_max = JOURNAL_TRANS_MAX_DEFAULT;
2699 journal->j_max_batch = JOURNAL_MAX_BATCH_DEFAULT;
2700 journal->j_max_commit_age = JOURNAL_MAX_COMMIT_AGE;
2702 /* for blocksize >= 4096 - max transaction size is 1024. For block size < 4096
2703 trans max size is decreased proportionally */
2704 if (p_s_sb->s_blocksize < 4096) {
2705 journal->j_trans_max /= (4096 / p_s_sb->s_blocksize);
2706 journal->j_max_batch = (journal->j_trans_max) * 9 / 10;
2710 journal->j_default_max_commit_age = journal->j_max_commit_age;
2712 if (commit_max_age != 0) {
2713 journal->j_max_commit_age = commit_max_age;
2714 journal->j_max_trans_age = commit_max_age;
2717 reiserfs_info(p_s_sb, "journal params: device %s, size %u, "
2718 "journal first block %u, max trans len %u, max batch %u, "
2719 "max commit age %u, max trans age %u\n",
2720 bdevname(journal->j_dev_bd, b),
2721 SB_ONDISK_JOURNAL_SIZE(p_s_sb),
2722 SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb),
2723 journal->j_trans_max,
2724 journal->j_max_batch,
2725 journal->j_max_commit_age, journal->j_max_trans_age);
2729 journal->j_list_bitmap_index = 0;
2730 journal_list_init(p_s_sb);
2732 memset(journal->j_list_hash_table, 0,
2733 JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *));
2735 INIT_LIST_HEAD(&journal->j_dirty_buffers);
2736 spin_lock_init(&journal->j_dirty_buffers_lock);
2738 journal->j_start = 0;
2740 journal->j_len_alloc = 0;
2741 atomic_set(&(journal->j_wcount), 0);
2742 atomic_set(&(journal->j_async_throttle), 0);
2743 journal->j_bcount = 0;
2744 journal->j_trans_start_time = 0;
2745 journal->j_last = NULL;
2746 journal->j_first = NULL;
2747 init_waitqueue_head(&(journal->j_join_wait));
2748 sema_init(&journal->j_lock, 1);
2749 sema_init(&journal->j_flush_sem, 1);
2751 journal->j_trans_id = 10;
2752 journal->j_mount_id = 10;
2753 journal->j_state = 0;
2754 atomic_set(&(journal->j_jlock), 0);
2755 journal->j_cnode_free_list = allocate_cnodes(num_cnodes);
2756 journal->j_cnode_free_orig = journal->j_cnode_free_list;
2757 journal->j_cnode_free = journal->j_cnode_free_list ? num_cnodes : 0;
2758 journal->j_cnode_used = 0;
2759 journal->j_must_wait = 0;
2761 if (journal->j_cnode_free == 0) {
2762 reiserfs_warning(p_s_sb, "journal-2004: Journal cnode memory "
2763 "allocation failed (%ld bytes). Journal is "
2764 "too large for available memory. Usually "
2765 "this is due to a journal that is too large.",
2766 sizeof (struct reiserfs_journal_cnode) * num_cnodes);
2767 goto free_and_return;
2770 init_journal_hash(p_s_sb);
2771 jl = journal->j_current_jl;
2772 jl->j_list_bitmap = get_list_bitmap(p_s_sb, jl);
2773 if (!jl->j_list_bitmap) {
2774 reiserfs_warning(p_s_sb,
2775 "journal-2005, get_list_bitmap failed for journal list 0");
2776 goto free_and_return;
2778 if (journal_read(p_s_sb) < 0) {
2779 reiserfs_warning(p_s_sb, "Replay Failure, unable to mount");
2780 goto free_and_return;
2783 reiserfs_mounted_fs_count++;
2784 if (reiserfs_mounted_fs_count <= 1)
2785 commit_wq = create_workqueue("reiserfs");
2787 INIT_WORK(&journal->j_work, flush_async_commits, p_s_sb);
2790 free_journal_ram(p_s_sb);
2795 ** test for a polite end of the current transaction. Used by file_write, and should
2796 ** be used by delete to make sure they don't write more than can fit inside a single
2799 int journal_transaction_should_end(struct reiserfs_transaction_handle *th,
2802 struct reiserfs_journal *journal = SB_JOURNAL(th->t_super);
2803 time_t now = get_seconds();
2804 /* cannot restart while nested */
2805 BUG_ON(!th->t_trans_id);
2806 if (th->t_refcount > 1)
2808 if (journal->j_must_wait > 0 ||
2809 (journal->j_len_alloc + new_alloc) >= journal->j_max_batch ||
2810 atomic_read(&(journal->j_jlock)) ||
2811 (now - journal->j_trans_start_time) > journal->j_max_trans_age ||
2812 journal->j_cnode_free < (journal->j_trans_max * 3)) {
2818 /* this must be called inside a transaction, and requires the
2819 ** kernel_lock to be held
2821 void reiserfs_block_writes(struct reiserfs_transaction_handle *th)
2823 struct reiserfs_journal *journal = SB_JOURNAL(th->t_super);
2824 BUG_ON(!th->t_trans_id);
2825 journal->j_must_wait = 1;
2826 set_bit(J_WRITERS_BLOCKED, &journal->j_state);
2830 /* this must be called without a transaction started, and does not
2833 void reiserfs_allow_writes(struct super_block *s)
2835 struct reiserfs_journal *journal = SB_JOURNAL(s);
2836 clear_bit(J_WRITERS_BLOCKED, &journal->j_state);
2837 wake_up(&journal->j_join_wait);
2840 /* this must be called without a transaction started, and does not
2843 void reiserfs_wait_on_write_block(struct super_block *s)
2845 struct reiserfs_journal *journal = SB_JOURNAL(s);
2846 wait_event(journal->j_join_wait,
2847 !test_bit(J_WRITERS_BLOCKED, &journal->j_state));
2850 static void queue_log_writer(struct super_block *s)
2853 struct reiserfs_journal *journal = SB_JOURNAL(s);
2854 set_bit(J_WRITERS_QUEUED, &journal->j_state);
2857 * we don't want to use wait_event here because
2858 * we only want to wait once.
2860 init_waitqueue_entry(&wait, current);
2861 add_wait_queue(&journal->j_join_wait, &wait);
2862 set_current_state(TASK_UNINTERRUPTIBLE);
2863 if (test_bit(J_WRITERS_QUEUED, &journal->j_state))
2865 current->state = TASK_RUNNING;
2866 remove_wait_queue(&journal->j_join_wait, &wait);
2869 static void wake_queued_writers(struct super_block *s)
2871 struct reiserfs_journal *journal = SB_JOURNAL(s);
2872 if (test_and_clear_bit(J_WRITERS_QUEUED, &journal->j_state))
2873 wake_up(&journal->j_join_wait);
2876 static void let_transaction_grow(struct super_block *sb, unsigned long trans_id)
2878 struct reiserfs_journal *journal = SB_JOURNAL(sb);
2879 unsigned long bcount = journal->j_bcount;
2881 schedule_timeout_uninterruptible(1);
2882 journal->j_current_jl->j_state |= LIST_COMMIT_PENDING;
2883 while ((atomic_read(&journal->j_wcount) > 0 ||
2884 atomic_read(&journal->j_jlock)) &&
2885 journal->j_trans_id == trans_id) {
2886 queue_log_writer(sb);
2888 if (journal->j_trans_id != trans_id)
2890 if (bcount == journal->j_bcount)
2892 bcount = journal->j_bcount;
2896 /* join == true if you must join an existing transaction.
2897 ** join == false if you can deal with waiting for others to finish
2899 ** this will block until the transaction is joinable. send the number of blocks you
2900 ** expect to use in nblocks.
2902 static int do_journal_begin_r(struct reiserfs_transaction_handle *th,
2903 struct super_block *p_s_sb, unsigned long nblocks,
2906 time_t now = get_seconds();
2908 struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
2909 struct reiserfs_transaction_handle myth;
2910 int sched_count = 0;
2913 reiserfs_check_lock_depth(p_s_sb, "journal_begin");
2914 if (nblocks > journal->j_trans_max)
2917 PROC_INFO_INC(p_s_sb, journal.journal_being);
2918 /* set here for journal_join */
2920 th->t_super = p_s_sb;
2923 lock_journal(p_s_sb);
2924 if (join != JBEGIN_ABORT && reiserfs_is_journal_aborted(journal)) {
2925 unlock_journal(p_s_sb);
2926 retval = journal->j_errno;
2929 journal->j_bcount++;
2931 if (test_bit(J_WRITERS_BLOCKED, &journal->j_state)) {
2932 unlock_journal(p_s_sb);
2933 reiserfs_wait_on_write_block(p_s_sb);
2934 PROC_INFO_INC(p_s_sb, journal.journal_relock_writers);
2937 now = get_seconds();
2939 /* if there is no room in the journal OR
2940 ** if this transaction is too old, and we weren't called joinable, wait for it to finish before beginning
2941 ** we don't sleep if there aren't other writers
2944 if ((!join && journal->j_must_wait > 0) ||
2946 && (journal->j_len_alloc + nblocks + 2) >= journal->j_max_batch)
2947 || (!join && atomic_read(&journal->j_wcount) > 0
2948 && journal->j_trans_start_time > 0
2949 && (now - journal->j_trans_start_time) >
2950 journal->j_max_trans_age) || (!join
2951 && atomic_read(&journal->j_jlock))
2952 || (!join && journal->j_cnode_free < (journal->j_trans_max * 3))) {
2954 old_trans_id = journal->j_trans_id;
2955 unlock_journal(p_s_sb); /* allow others to finish this transaction */
2957 if (!join && (journal->j_len_alloc + nblocks + 2) >=
2958 journal->j_max_batch &&
2959 ((journal->j_len + nblocks + 2) * 100) <
2960 (journal->j_len_alloc * 75)) {
2961 if (atomic_read(&journal->j_wcount) > 10) {
2963 queue_log_writer(p_s_sb);
2967 /* don't mess with joining the transaction if all we have to do is
2968 * wait for someone else to do a commit
2970 if (atomic_read(&journal->j_jlock)) {
2971 while (journal->j_trans_id == old_trans_id &&
2972 atomic_read(&journal->j_jlock)) {
2973 queue_log_writer(p_s_sb);
2977 retval = journal_join(&myth, p_s_sb, 1);
2981 /* someone might have ended the transaction while we joined */
2982 if (old_trans_id != journal->j_trans_id) {
2983 retval = do_journal_end(&myth, p_s_sb, 1, 0);
2985 retval = do_journal_end(&myth, p_s_sb, 1, COMMIT_NOW);
2991 PROC_INFO_INC(p_s_sb, journal.journal_relock_wcount);
2994 /* we are the first writer, set trans_id */
2995 if (journal->j_trans_start_time == 0) {
2996 journal->j_trans_start_time = get_seconds();
2998 atomic_inc(&(journal->j_wcount));
2999 journal->j_len_alloc += nblocks;
3000 th->t_blocks_logged = 0;
3001 th->t_blocks_allocated = nblocks;
3002 th->t_trans_id = journal->j_trans_id;
3003 unlock_journal(p_s_sb);
3004 INIT_LIST_HEAD(&th->t_list);
3009 memset(th, 0, sizeof(*th));
3010 /* Re-set th->t_super, so we can properly keep track of how many
3011 * persistent transactions there are. We need to do this so if this
3012 * call is part of a failed restart_transaction, we can free it later */
3013 th->t_super = p_s_sb;
3017 struct reiserfs_transaction_handle *reiserfs_persistent_transaction(struct
3023 struct reiserfs_transaction_handle *th;
3025 /* if we're nesting into an existing transaction. It will be
3026 ** persistent on its own
3028 if (reiserfs_transaction_running(s)) {
3029 th = current->journal_info;
3031 if (th->t_refcount < 2) {
3036 th = kmalloc(sizeof(struct reiserfs_transaction_handle), GFP_NOFS);
3039 ret = journal_begin(th, s, nblocks);
3045 SB_JOURNAL(s)->j_persistent_trans++;
3049 int reiserfs_end_persistent_transaction(struct reiserfs_transaction_handle *th)
3051 struct super_block *s = th->t_super;
3054 ret = journal_end(th, th->t_super, th->t_blocks_allocated);
3057 if (th->t_refcount == 0) {
3058 SB_JOURNAL(s)->j_persistent_trans--;
3064 static int journal_join(struct reiserfs_transaction_handle *th,
3065 struct super_block *p_s_sb, unsigned long nblocks)
3067 struct reiserfs_transaction_handle *cur_th = current->journal_info;
3069 /* this keeps do_journal_end from NULLing out the current->journal_info
3072 th->t_handle_save = cur_th;
3073 if (cur_th && cur_th->t_refcount > 1) {
3076 return do_journal_begin_r(th, p_s_sb, nblocks, JBEGIN_JOIN);
3079 int journal_join_abort(struct reiserfs_transaction_handle *th,
3080 struct super_block *p_s_sb, unsigned long nblocks)
3082 struct reiserfs_transaction_handle *cur_th = current->journal_info;
3084 /* this keeps do_journal_end from NULLing out the current->journal_info
3087 th->t_handle_save = cur_th;
3088 if (cur_th && cur_th->t_refcount > 1) {
3091 return do_journal_begin_r(th, p_s_sb, nblocks, JBEGIN_ABORT);
3094 int journal_begin(struct reiserfs_transaction_handle *th,
3095 struct super_block *p_s_sb, unsigned long nblocks)
3097 struct reiserfs_transaction_handle *cur_th = current->journal_info;
3100 th->t_handle_save = NULL;
3102 /* we are nesting into the current transaction */
3103 if (cur_th->t_super == p_s_sb) {
3104 BUG_ON(!cur_th->t_refcount);
3105 cur_th->t_refcount++;
3106 memcpy(th, cur_th, sizeof(*th));
3107 if (th->t_refcount <= 1)
3108 reiserfs_warning(p_s_sb,
3109 "BAD: refcount <= 1, but journal_info != 0");
3112 /* we've ended up with a handle from a different filesystem.
3113 ** save it and restore on journal_end. This should never
3116 reiserfs_warning(p_s_sb,
3117 "clm-2100: nesting info a different FS");
3118 th->t_handle_save = current->journal_info;
3119 current->journal_info = th;
3122 current->journal_info = th;
3124 ret = do_journal_begin_r(th, p_s_sb, nblocks, JBEGIN_REG);
3125 if (current->journal_info != th)
3128 /* I guess this boils down to being the reciprocal of clm-2100 above.
3129 * If do_journal_begin_r fails, we need to put it back, since journal_end
3130 * won't be called to do it. */
3132 current->journal_info = th->t_handle_save;
3134 BUG_ON(!th->t_refcount);
3140 ** puts bh into the current transaction. If it was already there, reorders removes the
3141 ** old pointers from the hash, and puts new ones in (to make sure replay happen in the right order).
3143 ** if it was dirty, cleans and files onto the clean list. I can't let it be dirty again until the
3144 ** transaction is committed.
3146 ** if j_len, is bigger than j_len_alloc, it pushes j_len_alloc to 10 + j_len.
3148 int journal_mark_dirty(struct reiserfs_transaction_handle *th,
3149 struct super_block *p_s_sb, struct buffer_head *bh)
3151 struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
3152 struct reiserfs_journal_cnode *cn = NULL;
3153 int count_already_incd = 0;
3155 BUG_ON(!th->t_trans_id);
3157 PROC_INFO_INC(p_s_sb, journal.mark_dirty);
3158 if (th->t_trans_id != journal->j_trans_id) {
3159 reiserfs_panic(th->t_super,
3160 "journal-1577: handle trans id %ld != current trans id %ld\n",
3161 th->t_trans_id, journal->j_trans_id);
3166 prepared = test_clear_buffer_journal_prepared(bh);
3167 clear_buffer_journal_restore_dirty(bh);
3168 /* already in this transaction, we are done */
3169 if (buffer_journaled(bh)) {
3170 PROC_INFO_INC(p_s_sb, journal.mark_dirty_already);
3174 /* this must be turned into a panic instead of a warning. We can't allow
3175 ** a dirty or journal_dirty or locked buffer to be logged, as some changes
3176 ** could get to disk too early. NOT GOOD.
3178 if (!prepared || buffer_dirty(bh)) {
3179 reiserfs_warning(p_s_sb, "journal-1777: buffer %llu bad state "
3180 "%cPREPARED %cLOCKED %cDIRTY %cJDIRTY_WAIT",
3181 (unsigned long long)bh->b_blocknr,
3182 prepared ? ' ' : '!',
3183 buffer_locked(bh) ? ' ' : '!',
3184 buffer_dirty(bh) ? ' ' : '!',
3185 buffer_journal_dirty(bh) ? ' ' : '!');
3188 if (atomic_read(&(journal->j_wcount)) <= 0) {
3189 reiserfs_warning(p_s_sb,
3190 "journal-1409: journal_mark_dirty returning because j_wcount was %d",
3191 atomic_read(&(journal->j_wcount)));
3194 /* this error means I've screwed up, and we've overflowed the transaction.
3195 ** Nothing can be done here, except make the FS readonly or panic.
3197 if (journal->j_len >= journal->j_trans_max) {
3198 reiserfs_panic(th->t_super,
3199 "journal-1413: journal_mark_dirty: j_len (%lu) is too big\n",
3203 if (buffer_journal_dirty(bh)) {
3204 count_already_incd = 1;
3205 PROC_INFO_INC(p_s_sb, journal.mark_dirty_notjournal);
3206 clear_buffer_journal_dirty(bh);
3209 if (journal->j_len > journal->j_len_alloc) {
3210 journal->j_len_alloc = journal->j_len + JOURNAL_PER_BALANCE_CNT;
3213 set_buffer_journaled(bh);
3215 /* now put this guy on the end */
3217 cn = get_cnode(p_s_sb);
3219 reiserfs_panic(p_s_sb, "get_cnode failed!\n");
3222 if (th->t_blocks_logged == th->t_blocks_allocated) {
3223 th->t_blocks_allocated += JOURNAL_PER_BALANCE_CNT;
3224 journal->j_len_alloc += JOURNAL_PER_BALANCE_CNT;
3226 th->t_blocks_logged++;
3230 cn->blocknr = bh->b_blocknr;
3233 insert_journal_hash(journal->j_hash_table, cn);
3234 if (!count_already_incd) {
3239 cn->prev = journal->j_last;
3241 if (journal->j_last) {
3242 journal->j_last->next = cn;
3243 journal->j_last = cn;
3245 journal->j_first = cn;
3246 journal->j_last = cn;
3251 int journal_end(struct reiserfs_transaction_handle *th,
3252 struct super_block *p_s_sb, unsigned long nblocks)
3254 if (!current->journal_info && th->t_refcount > 1)
3255 reiserfs_warning(p_s_sb, "REISER-NESTING: th NULL, refcount %d",
3258 if (!th->t_trans_id) {
3264 if (th->t_refcount > 0) {
3265 struct reiserfs_transaction_handle *cur_th =
3266 current->journal_info;
3268 /* we aren't allowed to close a nested transaction on a different
3269 ** filesystem from the one in the task struct
3271 if (cur_th->t_super != th->t_super)
3275 memcpy(current->journal_info, th, sizeof(*th));
3280 return do_journal_end(th, p_s_sb, nblocks, 0);
3284 /* removes from the current transaction, relsing and descrementing any counters.
3285 ** also files the removed buffer directly onto the clean list
3287 ** called by journal_mark_freed when a block has been deleted
3289 ** returns 1 if it cleaned and relsed the buffer. 0 otherwise
3291 static int remove_from_transaction(struct super_block *p_s_sb,
3292 b_blocknr_t blocknr, int already_cleaned)
3294 struct buffer_head *bh;
3295 struct reiserfs_journal_cnode *cn;
3296 struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
3299 cn = get_journal_hash_dev(p_s_sb, journal->j_hash_table, blocknr);
3300 if (!cn || !cn->bh) {
3305 cn->prev->next = cn->next;
3308 cn->next->prev = cn->prev;
3310 if (cn == journal->j_first) {
3311 journal->j_first = cn->next;
3313 if (cn == journal->j_last) {
3314 journal->j_last = cn->prev;
3317 remove_journal_hash(p_s_sb, journal->j_hash_table, NULL,
3319 clear_buffer_journaled(bh); /* don't log this one */
3321 if (!already_cleaned) {
3322 clear_buffer_journal_dirty(bh);
3323 clear_buffer_dirty(bh);
3324 clear_buffer_journal_test(bh);
3326 if (atomic_read(&(bh->b_count)) < 0) {
3327 reiserfs_warning(p_s_sb,
3328 "journal-1752: remove from trans, b_count < 0");
3333 journal->j_len_alloc--;
3334 free_cnode(p_s_sb, cn);
3339 ** for any cnode in a journal list, it can only be dirtied of all the
3340 ** transactions that include it are commited to disk.
3341 ** this checks through each transaction, and returns 1 if you are allowed to dirty,
3342 ** and 0 if you aren't
3344 ** it is called by dirty_journal_list, which is called after flush_commit_list has gotten all the log
3345 ** blocks for a given transaction on disk
3348 static int can_dirty(struct reiserfs_journal_cnode *cn)
3350 struct super_block *sb = cn->sb;
3351 b_blocknr_t blocknr = cn->blocknr;
3352 struct reiserfs_journal_cnode *cur = cn->hprev;
3355 /* first test hprev. These are all newer than cn, so any node here
3356 ** with the same block number and dev means this node can't be sent
3357 ** to disk right now.
3359 while (cur && can_dirty) {
3360 if (cur->jlist && cur->bh && cur->blocknr && cur->sb == sb &&
3361 cur->blocknr == blocknr) {
3366 /* then test hnext. These are all older than cn. As long as they
3367 ** are committed to the log, it is safe to write cn to disk
3370 while (cur && can_dirty) {
3371 if (cur->jlist && cur->jlist->j_len > 0 &&
3372 atomic_read(&(cur->jlist->j_commit_left)) > 0 && cur->bh &&
3373 cur->blocknr && cur->sb == sb && cur->blocknr == blocknr) {
3381 /* syncs the commit blocks, but does not force the real buffers to disk
3382 ** will wait until the current transaction is done/commited before returning
3384 int journal_end_sync(struct reiserfs_transaction_handle *th,
3385 struct super_block *p_s_sb, unsigned long nblocks)
3387 struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
3389 BUG_ON(!th->t_trans_id);
3390 /* you can sync while nested, very, very bad */
3391 if (th->t_refcount > 1) {
3394 if (journal->j_len == 0) {
3395 reiserfs_prepare_for_journal(p_s_sb, SB_BUFFER_WITH_SB(p_s_sb),
3397 journal_mark_dirty(th, p_s_sb, SB_BUFFER_WITH_SB(p_s_sb));
3399 return do_journal_end(th, p_s_sb, nblocks, COMMIT_NOW | WAIT);
3403 ** writeback the pending async commits to disk
3405 static void flush_async_commits(void *p)
3407 struct super_block *p_s_sb = p;
3408 struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
3409 struct reiserfs_journal_list *jl;
3410 struct list_head *entry;
3413 if (!list_empty(&journal->j_journal_list)) {
3414 /* last entry is the youngest, commit it and you get everything */
3415 entry = journal->j_journal_list.prev;
3416 jl = JOURNAL_LIST_ENTRY(entry);
3417 flush_commit_list(p_s_sb, jl, 1);
3421 * this is a little racey, but there's no harm in missing
3422 * the filemap_fdata_write
3424 if (!atomic_read(&journal->j_async_throttle)
3425 && !reiserfs_is_journal_aborted(journal)) {
3426 atomic_inc(&journal->j_async_throttle);
3427 filemap_fdatawrite(p_s_sb->s_bdev->bd_inode->i_mapping);
3428 atomic_dec(&journal->j_async_throttle);
3433 ** flushes any old transactions to disk
3434 ** ends the current transaction if it is too old
3436 int reiserfs_flush_old_commits(struct super_block *p_s_sb)
3439 struct reiserfs_transaction_handle th;
3440 struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
3442 now = get_seconds();
3443 /* safety check so we don't flush while we are replaying the log during
3446 if (list_empty(&journal->j_journal_list)) {
3450 /* check the current transaction. If there are no writers, and it is
3451 * too old, finish it, and force the commit blocks to disk
3453 if (atomic_read(&journal->j_wcount) <= 0 &&
3454 journal->j_trans_start_time > 0 &&
3455 journal->j_len > 0 &&
3456 (now - journal->j_trans_start_time) > journal->j_max_trans_age) {
3457 if (!journal_join(&th, p_s_sb, 1)) {
3458 reiserfs_prepare_for_journal(p_s_sb,
3459 SB_BUFFER_WITH_SB(p_s_sb),
3461 journal_mark_dirty(&th, p_s_sb,
3462 SB_BUFFER_WITH_SB(p_s_sb));
3464 /* we're only being called from kreiserfsd, it makes no sense to do
3465 ** an async commit so that kreiserfsd can do it later
3467 do_journal_end(&th, p_s_sb, 1, COMMIT_NOW | WAIT);
3470 return p_s_sb->s_dirt;
3474 ** returns 0 if do_journal_end should return right away, returns 1 if do_journal_end should finish the commit
3476 ** if the current transaction is too old, but still has writers, this will wait on j_join_wait until all
3477 ** the writers are done. By the time it wakes up, the transaction it was called has already ended, so it just
3478 ** flushes the commit list and returns 0.
3480 ** Won't batch when flush or commit_now is set. Also won't batch when others are waiting on j_join_wait.
3482 ** Note, we can't allow the journal_end to proceed while there are still writers in the log.
3484 static int check_journal_end(struct reiserfs_transaction_handle *th,
3485 struct super_block *p_s_sb, unsigned long nblocks,
3490 int flush = flags & FLUSH_ALL;
3491 int commit_now = flags & COMMIT_NOW;
3492 int wait_on_commit = flags & WAIT;
3493 struct reiserfs_journal_list *jl;
3494 struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
3496 BUG_ON(!th->t_trans_id);
3498 if (th->t_trans_id != journal->j_trans_id) {
3499 reiserfs_panic(th->t_super,
3500 "journal-1577: handle trans id %ld != current trans id %ld\n",
3501 th->t_trans_id, journal->j_trans_id);
3504 journal->j_len_alloc -= (th->t_blocks_allocated - th->t_blocks_logged);
3505 if (atomic_read(&(journal->j_wcount)) > 0) { /* <= 0 is allowed. unmounting might not call begin */
3506 atomic_dec(&(journal->j_wcount));
3509 /* BUG, deal with case where j_len is 0, but people previously freed blocks need to be released
3510 ** will be dealt with by next transaction that actually writes something, but should be taken
3511 ** care of in this trans
3513 if (journal->j_len == 0) {
3516 /* if wcount > 0, and we are called to with flush or commit_now,
3517 ** we wait on j_join_wait. We will wake up when the last writer has
3518 ** finished the transaction, and started it on its way to the disk.
3519 ** Then, we flush the commit or journal list, and just return 0
3520 ** because the rest of journal end was already done for this transaction.
3522 if (atomic_read(&(journal->j_wcount)) > 0) {
3523 if (flush || commit_now) {
3526 jl = journal->j_current_jl;
3527 trans_id = jl->j_trans_id;
3529 jl->j_state |= LIST_COMMIT_PENDING;
3530 atomic_set(&(journal->j_jlock), 1);
3532 journal->j_next_full_flush = 1;
3534 unlock_journal(p_s_sb);
3536 /* sleep while the current transaction is still j_jlocked */
3537 while (journal->j_trans_id == trans_id) {
3538 if (atomic_read(&journal->j_jlock)) {
3539 queue_log_writer(p_s_sb);
3541 lock_journal(p_s_sb);
3542 if (journal->j_trans_id == trans_id) {
3543 atomic_set(&(journal->j_jlock),
3546 unlock_journal(p_s_sb);
3549 if (journal->j_trans_id == trans_id) {
3553 && journal_list_still_alive(p_s_sb, trans_id)
3554 && wait_on_commit) {
3555 flush_commit_list(p_s_sb, jl, 1);
3559 unlock_journal(p_s_sb);
3563 /* deal with old transactions where we are the last writers */
3564 now = get_seconds();
3565 if ((now - journal->j_trans_start_time) > journal->j_max_trans_age) {
3567 journal->j_next_async_flush = 1;
3569 /* don't batch when someone is waiting on j_join_wait */
3570 /* don't batch when syncing the commit or flushing the whole trans */
3571 if (!(journal->j_must_wait > 0) && !(atomic_read(&(journal->j_jlock)))
3572 && !flush && !commit_now && (journal->j_len < journal->j_max_batch)
3573 && journal->j_len_alloc < journal->j_max_batch
3574 && journal->j_cnode_free > (journal->j_trans_max * 3)) {
3575 journal->j_bcount++;
3576 unlock_journal(p_s_sb);
3580 if (journal->j_start > SB_ONDISK_JOURNAL_SIZE(p_s_sb)) {
3581 reiserfs_panic(p_s_sb,
3582 "journal-003: journal_end: j_start (%ld) is too high\n",
3589 ** Does all the work that makes deleting blocks safe.
3590 ** when deleting a block mark BH_JNew, just remove it from the current transaction, clean it's buffer_head and move on.
3593 ** set a bit for the block in the journal bitmap. That will prevent it from being allocated for unformatted nodes
3594 ** before this transaction has finished.
3596 ** mark any cnodes for this block as BLOCK_FREED, and clear their bh pointers. That will prevent any old transactions with
3597 ** this block from trying to flush to the real location. Since we aren't removing the cnode from the journal_list_hash,
3598 ** the block can't be reallocated yet.
3600 ** Then remove it from the current transaction, decrementing any counters and filing it on the clean list.
3602 int journal_mark_freed(struct reiserfs_transaction_handle *th,
3603 struct super_block *p_s_sb, b_blocknr_t blocknr)
3605 struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
3606 struct reiserfs_journal_cnode *cn = NULL;
3607 struct buffer_head *bh = NULL;
3608 struct reiserfs_list_bitmap *jb = NULL;
3610 BUG_ON(!th->t_trans_id);
3612 cn = get_journal_hash_dev(p_s_sb, journal->j_hash_table, blocknr);
3617 /* if it is journal new, we just remove it from this transaction */
3618 if (bh && buffer_journal_new(bh)) {
3619 clear_buffer_journal_new(bh);
3620 clear_prepared_bits(bh);
3621 reiserfs_clean_and_file_buffer(bh);
3622 cleaned = remove_from_transaction(p_s_sb, blocknr, cleaned);
3624 /* set the bit for this block in the journal bitmap for this transaction */
3625 jb = journal->j_current_jl->j_list_bitmap;
3627 reiserfs_panic(p_s_sb,
3628 "journal-1702: journal_mark_freed, journal_list_bitmap is NULL\n");
3630 set_bit_in_list_bitmap(p_s_sb, blocknr, jb);
3632 /* Note, the entire while loop is not allowed to schedule. */
3635 clear_prepared_bits(bh);
3636 reiserfs_clean_and_file_buffer(bh);
3638 cleaned = remove_from_transaction(p_s_sb, blocknr, cleaned);
3640 /* find all older transactions with this block, make sure they don't try to write it out */
3641 cn = get_journal_hash_dev(p_s_sb, journal->j_list_hash_table,
3644 if (p_s_sb == cn->sb && blocknr == cn->blocknr) {
3645 set_bit(BLOCK_FREED, &cn->state);
3648 /* remove_from_transaction will brelse the buffer if it was
3649 ** in the current trans
3651 clear_buffer_journal_dirty(cn->
3653 clear_buffer_dirty(cn->bh);
3654 clear_buffer_journal_test(cn->
3659 (&(cn->bh->b_count)) < 0) {
3660 reiserfs_warning(p_s_sb,
3661 "journal-2138: cn->bh->b_count < 0");
3664 if (cn->jlist) { /* since we are clearing the bh, we MUST dec nonzerolen */
3677 put_bh(bh); /* get_hash grabs the buffer */
3678 if (atomic_read(&(bh->b_count)) < 0) {
3679 reiserfs_warning(p_s_sb,
3680 "journal-2165: bh->b_count < 0");
3686 void reiserfs_update_inode_transaction(struct inode *inode)
3688 struct reiserfs_journal *journal = SB_JOURNAL(inode->i_sb);
3689 REISERFS_I(inode)->i_jl = journal->j_current_jl;
3690 REISERFS_I(inode)->i_trans_id = journal->j_trans_id;
3694 * returns -1 on error, 0 if no commits/barriers were done and 1
3695 * if a transaction was actually committed and the barrier was done
3697 static int __commit_trans_jl(struct inode *inode, unsigned long id,
3698 struct reiserfs_journal_list *jl)
3700 struct reiserfs_transaction_handle th;
3701 struct super_block *sb = inode->i_sb;
3702 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3705 /* is it from the current transaction, or from an unknown transaction? */
3706 if (id == journal->j_trans_id) {
3707 jl = journal->j_current_jl;
3708 /* try to let other writers come in and grow this transaction */
3709 let_transaction_grow(sb, id);
3710 if (journal->j_trans_id != id) {
3711 goto flush_commit_only;
3714 ret = journal_begin(&th, sb, 1);
3718 /* someone might have ended this transaction while we joined */
3719 if (journal->j_trans_id != id) {
3720 reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
3722 journal_mark_dirty(&th, sb, SB_BUFFER_WITH_SB(sb));
3723 ret = journal_end(&th, sb, 1);
3724 goto flush_commit_only;
3727 ret = journal_end_sync(&th, sb, 1);
3732 /* this gets tricky, we have to make sure the journal list in
3733 * the inode still exists. We know the list is still around
3734 * if we've got a larger transaction id than the oldest list
3737 if (journal_list_still_alive(inode->i_sb, id)) {
3739 * we only set ret to 1 when we know for sure
3740 * the barrier hasn't been started yet on the commit
3743 if (atomic_read(&jl->j_commit_left) > 1)
3745 flush_commit_list(sb, jl, 1);
3746 if (journal->j_errno)
3747 ret = journal->j_errno;
3750 /* otherwise the list is gone, and long since committed */
3754 int reiserfs_commit_for_inode(struct inode *inode)
3756 unsigned long id = REISERFS_I(inode)->i_trans_id;
3757 struct reiserfs_journal_list *jl = REISERFS_I(inode)->i_jl;
3759 /* for the whole inode, assume unset id means it was
3760 * changed in the current transaction. More conservative
3763 reiserfs_update_inode_transaction(inode);
3764 id = REISERFS_I(inode)->i_trans_id;
3765 /* jl will be updated in __commit_trans_jl */
3768 return __commit_trans_jl(inode, id, jl);
3771 void reiserfs_restore_prepared_buffer(struct super_block *p_s_sb,
3772 struct buffer_head *bh)
3774 struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
3775 PROC_INFO_INC(p_s_sb, journal.restore_prepared);
3779 if (test_clear_buffer_journal_restore_dirty(bh) &&
3780 buffer_journal_dirty(bh)) {
3781 struct reiserfs_journal_cnode *cn;
3782 cn = get_journal_hash_dev(p_s_sb,
3783 journal->j_list_hash_table,
3785 if (cn && can_dirty(cn)) {
3786 set_buffer_journal_test(bh);
3787 mark_buffer_dirty(bh);
3790 clear_buffer_journal_prepared(bh);
3793 extern struct tree_balance *cur_tb;
3795 ** before we can change a metadata block, we have to make sure it won't
3796 ** be written to disk while we are altering it. So, we must:
3801 int reiserfs_prepare_for_journal(struct super_block *p_s_sb,
3802 struct buffer_head *bh, int wait)
3804 PROC_INFO_INC(p_s_sb, journal.prepare);
3806 if (test_set_buffer_locked(bh)) {
3811 set_buffer_journal_prepared(bh);
3812 if (test_clear_buffer_dirty(bh) && buffer_journal_dirty(bh)) {
3813 clear_buffer_journal_test(bh);
3814 set_buffer_journal_restore_dirty(bh);
3820 static void flush_old_journal_lists(struct super_block *s)
3822 struct reiserfs_journal *journal = SB_JOURNAL(s);
3823 struct reiserfs_journal_list *jl;
3824 struct list_head *entry;
3825 time_t now = get_seconds();
3827 while (!list_empty(&journal->j_journal_list)) {
3828 entry = journal->j_journal_list.next;
3829 jl = JOURNAL_LIST_ENTRY(entry);
3830 /* this check should always be run, to send old lists to disk */
3831 if (jl->j_timestamp < (now - (JOURNAL_MAX_TRANS_AGE * 4))) {
3832 flush_used_journal_lists(s, jl);
3840 ** long and ugly. If flush, will not return until all commit
3841 ** blocks and all real buffers in the trans are on disk.
3842 ** If no_async, won't return until all commit blocks are on disk.
3844 ** keep reading, there are comments as you go along
3846 ** If the journal is aborted, we just clean up. Things like flushing
3847 ** journal lists, etc just won't happen.
3849 static int do_journal_end(struct reiserfs_transaction_handle *th,
3850 struct super_block *p_s_sb, unsigned long nblocks,
3853 struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
3854 struct reiserfs_journal_cnode *cn, *next, *jl_cn;
3855 struct reiserfs_journal_cnode *last_cn = NULL;
3856 struct reiserfs_journal_desc *desc;
3857 struct reiserfs_journal_commit *commit;
3858 struct buffer_head *c_bh; /* commit bh */
3859 struct buffer_head *d_bh; /* desc bh */
3860 int cur_write_start = 0; /* start index of current log write */
3863 int flush = flags & FLUSH_ALL;
3864 int wait_on_commit = flags & WAIT;
3865 struct reiserfs_journal_list *jl, *temp_jl;
3866 struct list_head *entry, *safe;
3867 unsigned long jindex;
3868 unsigned long commit_trans_id;
3871 BUG_ON(th->t_refcount > 1);
3872 BUG_ON(!th->t_trans_id);
3875 current->journal_info = th->t_handle_save;
3876 reiserfs_check_lock_depth(p_s_sb, "journal end");
3877 if (journal->j_len == 0) {
3878 reiserfs_prepare_for_journal(p_s_sb, SB_BUFFER_WITH_SB(p_s_sb),
3880 journal_mark_dirty(th, p_s_sb, SB_BUFFER_WITH_SB(p_s_sb));
3883 lock_journal(p_s_sb);
3884 if (journal->j_next_full_flush) {
3888 if (journal->j_next_async_flush) {
3889 flags |= COMMIT_NOW | WAIT;
3893 /* check_journal_end locks the journal, and unlocks if it does not return 1
3894 ** it tells us if we should continue with the journal_end, or just return
3896 if (!check_journal_end(th, p_s_sb, nblocks, flags)) {
3898 wake_queued_writers(p_s_sb);
3899 reiserfs_async_progress_wait(p_s_sb);
3903 /* check_journal_end might set these, check again */
3904 if (journal->j_next_full_flush) {
3909 ** j must wait means we have to flush the log blocks, and the real blocks for
3912 if (journal->j_must_wait > 0) {
3915 #ifdef REISERFS_PREALLOCATE
3916 /* quota ops might need to nest, setup the journal_info pointer for them
3917 * and raise the refcount so that it is > 0. */
3918 current->journal_info = th;
3920 reiserfs_discard_all_prealloc(th); /* it should not involve new blocks into
3921 * the transaction */
3923 current->journal_info = th->t_handle_save;
3926 /* setup description block */
3928 journal_getblk(p_s_sb,
3929 SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) +
3931 set_buffer_uptodate(d_bh);
3932 desc = (struct reiserfs_journal_desc *)(d_bh)->b_data;
3933 memset(d_bh->b_data, 0, d_bh->b_size);
3934 memcpy(get_journal_desc_magic(d_bh), JOURNAL_DESC_MAGIC, 8);
3935 set_desc_trans_id(desc, journal->j_trans_id);
3937 /* setup commit block. Don't write (keep it clean too) this one until after everyone else is written */
3938 c_bh = journal_getblk(p_s_sb, SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) +
3939 ((journal->j_start + journal->j_len +
3940 1) % SB_ONDISK_JOURNAL_SIZE(p_s_sb)));
3941 commit = (struct reiserfs_journal_commit *)c_bh->b_data;
3942 memset(c_bh->b_data, 0, c_bh->b_size);
3943 set_commit_trans_id(commit, journal->j_trans_id);
3944 set_buffer_uptodate(c_bh);
3946 /* init this journal list */
3947 jl = journal->j_current_jl;
3949 /* we lock the commit before doing anything because
3950 * we want to make sure nobody tries to run flush_commit_list until
3951 * the new transaction is fully setup, and we've already flushed the
3954 down(&jl->j_commit_lock);
3956 /* save the transaction id in case we need to commit it later */
3957 commit_trans_id = jl->j_trans_id;
3959 atomic_set(&jl->j_older_commits_done, 0);
3960 jl->j_trans_id = journal->j_trans_id;
3961 jl->j_timestamp = journal->j_trans_start_time;
3962 jl->j_commit_bh = c_bh;
3963 jl->j_start = journal->j_start;
3964 jl->j_len = journal->j_len;
3965 atomic_set(&jl->j_nonzerolen, journal->j_len);
3966 atomic_set(&jl->j_commit_left, journal->j_len + 2);
3967 jl->j_realblock = NULL;
3969 /* The ENTIRE FOR LOOP MUST not cause schedule to occur.
3970 ** for each real block, add it to the journal list hash,
3971 ** copy into real block index array in the commit or desc block
3973 trans_half = journal_trans_half(p_s_sb->s_blocksize);
3974 for (i = 0, cn = journal->j_first; cn; cn = cn->next, i++) {
3975 if (buffer_journaled(cn->bh)) {
3976 jl_cn = get_cnode(p_s_sb);
3978 reiserfs_panic(p_s_sb,
3979 "journal-1676, get_cnode returned NULL\n");
3982 jl->j_realblock = jl_cn;
3984 jl_cn->prev = last_cn;
3987 last_cn->next = jl_cn;
3990 /* make sure the block we are trying to log is not a block
3991 of journal or reserved area */
3993 if (is_block_in_log_or_reserved_area
3994 (p_s_sb, cn->bh->b_blocknr)) {
3995 reiserfs_panic(p_s_sb,
3996 "journal-2332: Trying to log block %lu, which is a log block\n",
3999 jl_cn->blocknr = cn->bh->b_blocknr;
4004 insert_journal_hash(journal->j_list_hash_table, jl_cn);
4005 if (i < trans_half) {
4006 desc->j_realblock[i] =
4007 cpu_to_le32(cn->bh->b_blocknr);
4009 commit->j_realblock[i - trans_half] =
4010 cpu_to_le32(cn->bh->b_blocknr);
4016 set_desc_trans_len(desc, journal->j_len);
4017 set_desc_mount_id(desc, journal->j_mount_id);
4018 set_desc_trans_id(desc, journal->j_trans_id);
4019 set_commit_trans_len(commit, journal->j_len);
4021 /* special check in case all buffers in the journal were marked for not logging */
4022 if (journal->j_len == 0) {
4026 /* we're about to dirty all the log blocks, mark the description block
4027 * dirty now too. Don't mark the commit block dirty until all the
4028 * others are on disk
4030 mark_buffer_dirty(d_bh);
4032 /* first data block is j_start + 1, so add one to cur_write_start wherever you use it */
4033 cur_write_start = journal->j_start;
4034 cn = journal->j_first;
4035 jindex = 1; /* start at one so we don't get the desc again */
4037 clear_buffer_journal_new(cn->bh);
4038 /* copy all the real blocks into log area. dirty log blocks */
4039 if (buffer_journaled(cn->bh)) {
4040 struct buffer_head *tmp_bh;
4044 journal_getblk(p_s_sb,
4045 SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) +
4048 SB_ONDISK_JOURNAL_SIZE(p_s_sb)));
4049 set_buffer_uptodate(tmp_bh);
4050 page = cn->bh->b_page;
4052 memcpy(tmp_bh->b_data,
4053 addr + offset_in_page(cn->bh->b_data),
4056 mark_buffer_dirty(tmp_bh);
4058 set_buffer_journal_dirty(cn->bh);
4059 clear_buffer_journaled(cn->bh);
4061 /* JDirty cleared sometime during transaction. don't log this one */
4062 reiserfs_warning(p_s_sb,
4063 "journal-2048: do_journal_end: BAD, buffer in journal hash, but not JDirty!");
4067 free_cnode(p_s_sb, cn);
4072 /* we are done with both the c_bh and d_bh, but
4073 ** c_bh must be written after all other commit blocks,
4074 ** so we dirty/relse c_bh in flush_commit_list, with commit_left <= 1.
4077 journal->j_current_jl = alloc_journal_list(p_s_sb);
4079 /* now it is safe to insert this transaction on the main list */
4080 list_add_tail(&jl->j_list, &journal->j_journal_list);
4081 list_add_tail(&jl->j_working_list, &journal->j_working_list);
4082 journal->j_num_work_lists++;
4084 /* reset journal values for the next transaction */
4085 old_start = journal->j_start;
4087 (journal->j_start + journal->j_len +
4088 2) % SB_ONDISK_JOURNAL_SIZE(p_s_sb);
4089 atomic_set(&(journal->j_wcount), 0);
4090 journal->j_bcount = 0;
4091 journal->j_last = NULL;
4092 journal->j_first = NULL;
4094 journal->j_trans_start_time = 0;
4095 journal->j_trans_id++;
4096 journal->j_current_jl->j_trans_id = journal->j_trans_id;
4097 journal->j_must_wait = 0;
4098 journal->j_len_alloc = 0;
4099 journal->j_next_full_flush = 0;
4100 journal->j_next_async_flush = 0;
4101 init_journal_hash(p_s_sb);
4103 // make sure reiserfs_add_jh sees the new current_jl before we
4104 // write out the tails
4107 /* tail conversion targets have to hit the disk before we end the
4108 * transaction. Otherwise a later transaction might repack the tail
4109 * before this transaction commits, leaving the data block unflushed and
4110 * clean, if we crash before the later transaction commits, the data block
4113 if (!list_empty(&jl->j_tail_bh_list)) {
4115 write_ordered_buffers(&journal->j_dirty_buffers_lock,
4116 journal, jl, &jl->j_tail_bh_list);
4119 if (!list_empty(&jl->j_tail_bh_list))
4121 up(&jl->j_commit_lock);
4123 /* honor the flush wishes from the caller, simple commits can
4124 ** be done outside the journal lock, they are done below
4126 ** if we don't flush the commit list right now, we put it into
4127 ** the work queue so the people waiting on the async progress work
4128 ** queue don't wait for this proc to flush journal lists and such.
4131 flush_commit_list(p_s_sb, jl, 1);
4132 flush_journal_list(p_s_sb, jl, 1);
4133 } else if (!(jl->j_state & LIST_COMMIT_PENDING))
4134 queue_delayed_work(commit_wq, &journal->j_work, HZ / 10);
4136 /* if the next transaction has any chance of wrapping, flush
4137 ** transactions that might get overwritten. If any journal lists are very
4138 ** old flush them as well.
4141 list_for_each_safe(entry, safe, &journal->j_journal_list) {
4142 temp_jl = JOURNAL_LIST_ENTRY(entry);
4143 if (journal->j_start <= temp_jl->j_start) {
4144 if ((journal->j_start + journal->j_trans_max + 1) >=
4146 flush_used_journal_lists(p_s_sb, temp_jl);
4148 } else if ((journal->j_start +
4149 journal->j_trans_max + 1) <
4150 SB_ONDISK_JOURNAL_SIZE(p_s_sb)) {
4151 /* if we don't cross into the next transaction and we don't
4152 * wrap, there is no way we can overlap any later transactions
4157 } else if ((journal->j_start +
4158 journal->j_trans_max + 1) >
4159 SB_ONDISK_JOURNAL_SIZE(p_s_sb)) {
4160 if (((journal->j_start + journal->j_trans_max + 1) %
4161 SB_ONDISK_JOURNAL_SIZE(p_s_sb)) >=
4163 flush_used_journal_lists(p_s_sb, temp_jl);
4166 /* we don't overlap anything from out start to the end of the
4167 * log, and our wrapped portion doesn't overlap anything at
4168 * the start of the log. We can break
4174 flush_old_journal_lists(p_s_sb);
4176 journal->j_current_jl->j_list_bitmap =
4177 get_list_bitmap(p_s_sb, journal->j_current_jl);
4179 if (!(journal->j_current_jl->j_list_bitmap)) {
4180 reiserfs_panic(p_s_sb,
4181 "journal-1996: do_journal_end, could not get a list bitmap\n");
4184 atomic_set(&(journal->j_jlock), 0);
4185 unlock_journal(p_s_sb);
4186 /* wake up any body waiting to join. */
4187 clear_bit(J_WRITERS_QUEUED, &journal->j_state);
4188 wake_up(&(journal->j_join_wait));
4190 if (!flush && wait_on_commit &&
4191 journal_list_still_alive(p_s_sb, commit_trans_id)) {
4192 flush_commit_list(p_s_sb, jl, 1);
4195 reiserfs_check_lock_depth(p_s_sb, "journal end2");
4197 memset(th, 0, sizeof(*th));
4198 /* Re-set th->t_super, so we can properly keep track of how many
4199 * persistent transactions there are. We need to do this so if this
4200 * call is part of a failed restart_transaction, we can free it later */
4201 th->t_super = p_s_sb;
4203 return journal->j_errno;
4206 static void __reiserfs_journal_abort_hard(struct super_block *sb)
4208 struct reiserfs_journal *journal = SB_JOURNAL(sb);
4209 if (test_bit(J_ABORTED, &journal->j_state))
4212 printk(KERN_CRIT "REISERFS: Aborting journal for filesystem on %s\n",
4213 reiserfs_bdevname(sb));
4215 sb->s_flags |= MS_RDONLY;
4216 set_bit(J_ABORTED, &journal->j_state);
4218 #ifdef CONFIG_REISERFS_CHECK
4223 static void __reiserfs_journal_abort_soft(struct super_block *sb, int errno)
4225 struct reiserfs_journal *journal = SB_JOURNAL(sb);
4226 if (test_bit(J_ABORTED, &journal->j_state))
4229 if (!journal->j_errno)
4230 journal->j_errno = errno;
4232 __reiserfs_journal_abort_hard(sb);
4235 void reiserfs_journal_abort(struct super_block *sb, int errno)
4237 return __reiserfs_journal_abort_soft(sb, errno);