2 * Write ahead logging implementation copyright Chris Mason 2000
4 * The background commits make this code very interrelated, 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/time.h>
38 #include <linux/semaphore.h>
39 #include <linux/vmalloc.h>
41 #include <linux/kernel.h>
42 #include <linux/errno.h>
43 #include <linux/fcntl.h>
44 #include <linux/stat.h>
45 #include <linux/string.h>
46 #include <linux/buffer_head.h>
47 #include <linux/workqueue.h>
48 #include <linux/writeback.h>
49 #include <linux/blkdev.h>
50 #include <linux/backing-dev.h>
51 #include <linux/uaccess.h>
52 #include <linux/slab.h>
55 /* gets a struct reiserfs_journal_list * from a list head */
56 #define JOURNAL_LIST_ENTRY(h) (list_entry((h), struct reiserfs_journal_list, \
58 #define JOURNAL_WORK_ENTRY(h) (list_entry((h), struct reiserfs_journal_list, \
61 /* must be correct to keep the desc and commit structs at 4k */
62 #define JOURNAL_TRANS_HALF 1018
63 #define BUFNR 64 /*read ahead */
65 /* cnode stat bits. Move these into reiserfs_fs.h */
67 /* this block was freed, and can't be written. */
69 /* this block was freed during this transaction, and can't be written */
70 #define BLOCK_FREED_HOLDER 3
72 /* used in flush_journal_list */
73 #define BLOCK_NEEDS_FLUSH 4
74 #define BLOCK_DIRTIED 5
76 /* journal list state bits */
77 #define LIST_TOUCHED 1
79 #define LIST_COMMIT_PENDING 4 /* someone will commit this list */
81 /* flags for do_journal_end */
82 #define FLUSH_ALL 1 /* flush commit and real blocks */
83 #define COMMIT_NOW 2 /* end and commit this transaction */
84 #define WAIT 4 /* wait for the log blocks to hit the disk */
86 static int do_journal_end(struct reiserfs_transaction_handle *, int flags);
87 static int flush_journal_list(struct super_block *s,
88 struct reiserfs_journal_list *jl, int flushall);
89 static int flush_commit_list(struct super_block *s,
90 struct reiserfs_journal_list *jl, int flushall);
91 static int can_dirty(struct reiserfs_journal_cnode *cn);
92 static int journal_join(struct reiserfs_transaction_handle *th,
93 struct super_block *sb);
94 static void release_journal_dev(struct super_block *super,
95 struct reiserfs_journal *journal);
96 static int dirty_one_transaction(struct super_block *s,
97 struct reiserfs_journal_list *jl);
98 static void flush_async_commits(struct work_struct *work);
99 static void queue_log_writer(struct super_block *s);
101 /* values for join in do_journal_begin_r */
103 JBEGIN_REG = 0, /* regular journal begin */
104 /* join the running transaction if at all possible */
106 /* called from cleanup code, ignores aborted flag */
110 static int do_journal_begin_r(struct reiserfs_transaction_handle *th,
111 struct super_block *sb,
112 unsigned long nblocks, int join);
114 static void init_journal_hash(struct super_block *sb)
116 struct reiserfs_journal *journal = SB_JOURNAL(sb);
117 memset(journal->j_hash_table, 0,
118 JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *));
122 * clears BH_Dirty and sticks the buffer on the clean list. Called because
123 * I can't allow refile_buffer to make schedule happen after I've freed a
124 * block. Look at remove_from_transaction and journal_mark_freed for
127 static int reiserfs_clean_and_file_buffer(struct buffer_head *bh)
130 clear_buffer_dirty(bh);
131 clear_buffer_journal_test(bh);
136 static struct reiserfs_bitmap_node *allocate_bitmap_node(struct super_block
139 struct reiserfs_bitmap_node *bn;
142 bn = kmalloc(sizeof(struct reiserfs_bitmap_node), GFP_NOFS);
146 bn->data = kzalloc(sb->s_blocksize, GFP_NOFS);
152 INIT_LIST_HEAD(&bn->list);
156 static struct reiserfs_bitmap_node *get_bitmap_node(struct super_block *sb)
158 struct reiserfs_journal *journal = SB_JOURNAL(sb);
159 struct reiserfs_bitmap_node *bn = NULL;
160 struct list_head *entry = journal->j_bitmap_nodes.next;
162 journal->j_used_bitmap_nodes++;
165 if (entry != &journal->j_bitmap_nodes) {
166 bn = list_entry(entry, struct reiserfs_bitmap_node, list);
168 memset(bn->data, 0, sb->s_blocksize);
169 journal->j_free_bitmap_nodes--;
172 bn = allocate_bitmap_node(sb);
179 static inline void free_bitmap_node(struct super_block *sb,
180 struct reiserfs_bitmap_node *bn)
182 struct reiserfs_journal *journal = SB_JOURNAL(sb);
183 journal->j_used_bitmap_nodes--;
184 if (journal->j_free_bitmap_nodes > REISERFS_MAX_BITMAP_NODES) {
188 list_add(&bn->list, &journal->j_bitmap_nodes);
189 journal->j_free_bitmap_nodes++;
193 static void allocate_bitmap_nodes(struct super_block *sb)
196 struct reiserfs_journal *journal = SB_JOURNAL(sb);
197 struct reiserfs_bitmap_node *bn = NULL;
198 for (i = 0; i < REISERFS_MIN_BITMAP_NODES; i++) {
199 bn = allocate_bitmap_node(sb);
201 list_add(&bn->list, &journal->j_bitmap_nodes);
202 journal->j_free_bitmap_nodes++;
204 /* this is ok, we'll try again when more are needed */
210 static int set_bit_in_list_bitmap(struct super_block *sb,
212 struct reiserfs_list_bitmap *jb)
214 unsigned int bmap_nr = block / (sb->s_blocksize << 3);
215 unsigned int bit_nr = block % (sb->s_blocksize << 3);
217 if (!jb->bitmaps[bmap_nr]) {
218 jb->bitmaps[bmap_nr] = get_bitmap_node(sb);
220 set_bit(bit_nr, (unsigned long *)jb->bitmaps[bmap_nr]->data);
224 static void cleanup_bitmap_list(struct super_block *sb,
225 struct reiserfs_list_bitmap *jb)
228 if (jb->bitmaps == NULL)
231 for (i = 0; i < reiserfs_bmap_count(sb); i++) {
232 if (jb->bitmaps[i]) {
233 free_bitmap_node(sb, jb->bitmaps[i]);
234 jb->bitmaps[i] = NULL;
240 * only call this on FS unmount.
242 static int free_list_bitmaps(struct super_block *sb,
243 struct reiserfs_list_bitmap *jb_array)
246 struct reiserfs_list_bitmap *jb;
247 for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
249 jb->journal_list = NULL;
250 cleanup_bitmap_list(sb, jb);
257 static int free_bitmap_nodes(struct super_block *sb)
259 struct reiserfs_journal *journal = SB_JOURNAL(sb);
260 struct list_head *next = journal->j_bitmap_nodes.next;
261 struct reiserfs_bitmap_node *bn;
263 while (next != &journal->j_bitmap_nodes) {
264 bn = list_entry(next, struct reiserfs_bitmap_node, list);
268 next = journal->j_bitmap_nodes.next;
269 journal->j_free_bitmap_nodes--;
276 * get memory for JOURNAL_NUM_BITMAPS worth of bitmaps.
277 * jb_array is the array to be filled in.
279 int reiserfs_allocate_list_bitmaps(struct super_block *sb,
280 struct reiserfs_list_bitmap *jb_array,
281 unsigned int bmap_nr)
285 struct reiserfs_list_bitmap *jb;
286 int mem = bmap_nr * sizeof(struct reiserfs_bitmap_node *);
288 for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
290 jb->journal_list = NULL;
291 jb->bitmaps = vzalloc(mem);
293 reiserfs_warning(sb, "clm-2000", "unable to "
294 "allocate bitmaps for journal lists");
300 free_list_bitmaps(sb, jb_array);
307 * find an available list bitmap. If you can't find one, flush a commit list
310 static struct reiserfs_list_bitmap *get_list_bitmap(struct super_block *sb,
311 struct reiserfs_journal_list
315 struct reiserfs_journal *journal = SB_JOURNAL(sb);
316 struct reiserfs_list_bitmap *jb = NULL;
318 for (j = 0; j < (JOURNAL_NUM_BITMAPS * 3); j++) {
319 i = journal->j_list_bitmap_index;
320 journal->j_list_bitmap_index = (i + 1) % JOURNAL_NUM_BITMAPS;
321 jb = journal->j_list_bitmap + i;
322 if (journal->j_list_bitmap[i].journal_list) {
323 flush_commit_list(sb,
324 journal->j_list_bitmap[i].
326 if (!journal->j_list_bitmap[i].journal_list) {
333 /* double check to make sure if flushed correctly */
334 if (jb->journal_list)
336 jb->journal_list = jl;
341 * allocates a new chunk of X nodes, and links them all together as a list.
342 * Uses the cnode->next and cnode->prev pointers
343 * returns NULL on failure
345 static struct reiserfs_journal_cnode *allocate_cnodes(int num_cnodes)
347 struct reiserfs_journal_cnode *head;
349 if (num_cnodes <= 0) {
352 head = vzalloc(num_cnodes * sizeof(struct reiserfs_journal_cnode));
357 head[0].next = head + 1;
358 for (i = 1; i < num_cnodes; i++) {
359 head[i].prev = head + (i - 1);
360 head[i].next = head + (i + 1); /* if last one, overwrite it after the if */
362 head[num_cnodes - 1].next = NULL;
366 /* pulls a cnode off the free list, or returns NULL on failure */
367 static struct reiserfs_journal_cnode *get_cnode(struct super_block *sb)
369 struct reiserfs_journal_cnode *cn;
370 struct reiserfs_journal *journal = SB_JOURNAL(sb);
372 reiserfs_check_lock_depth(sb, "get_cnode");
374 if (journal->j_cnode_free <= 0) {
377 journal->j_cnode_used++;
378 journal->j_cnode_free--;
379 cn = journal->j_cnode_free_list;
384 cn->next->prev = NULL;
386 journal->j_cnode_free_list = cn->next;
387 memset(cn, 0, sizeof(struct reiserfs_journal_cnode));
392 * returns a cnode to the free list
394 static void free_cnode(struct super_block *sb,
395 struct reiserfs_journal_cnode *cn)
397 struct reiserfs_journal *journal = SB_JOURNAL(sb);
399 reiserfs_check_lock_depth(sb, "free_cnode");
401 journal->j_cnode_used--;
402 journal->j_cnode_free++;
403 /* memset(cn, 0, sizeof(struct reiserfs_journal_cnode)) ; */
404 cn->next = journal->j_cnode_free_list;
405 if (journal->j_cnode_free_list) {
406 journal->j_cnode_free_list->prev = cn;
408 cn->prev = NULL; /* not needed with the memset, but I might kill the memset, and forget to do this */
409 journal->j_cnode_free_list = cn;
412 static void clear_prepared_bits(struct buffer_head *bh)
414 clear_buffer_journal_prepared(bh);
415 clear_buffer_journal_restore_dirty(bh);
419 * return a cnode with same dev, block number and size in table,
420 * or null if not found
422 static inline struct reiserfs_journal_cnode *get_journal_hash_dev(struct
426 reiserfs_journal_cnode
430 struct reiserfs_journal_cnode *cn;
431 cn = journal_hash(table, sb, bl);
433 if (cn->blocknr == bl && cn->sb == sb)
437 return (struct reiserfs_journal_cnode *)0;
441 * this actually means 'can this block be reallocated yet?'. If you set
442 * search_all, a block can only be allocated if it is not in the current
443 * transaction, was not freed by the current transaction, and has no chance
444 * of ever being overwritten by a replay after crashing.
446 * If you don't set search_all, a block can only be allocated if it is not
447 * in the current transaction. Since deleting a block removes it from the
448 * current transaction, this case should never happen. If you don't set
449 * search_all, make sure you never write the block without logging it.
451 * next_zero_bit is a suggestion about the next block to try for find_forward.
452 * when bl is rejected because it is set in a journal list bitmap, we search
453 * for the next zero bit in the bitmap that rejected bl. Then, we return
454 * that through next_zero_bit for find_forward to try.
456 * Just because we return something in next_zero_bit does not mean we won't
457 * reject it on the next call to reiserfs_in_journal
459 int reiserfs_in_journal(struct super_block *sb,
460 unsigned int bmap_nr, int bit_nr, int search_all,
461 b_blocknr_t * next_zero_bit)
463 struct reiserfs_journal *journal = SB_JOURNAL(sb);
464 struct reiserfs_journal_cnode *cn;
465 struct reiserfs_list_bitmap *jb;
469 *next_zero_bit = 0; /* always start this at zero. */
471 PROC_INFO_INC(sb, journal.in_journal);
473 * If we aren't doing a search_all, this is a metablock, and it
474 * will be logged before use. if we crash before the transaction
475 * that freed it commits, this transaction won't have committed
476 * either, and the block will never be written
479 for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
480 PROC_INFO_INC(sb, journal.in_journal_bitmap);
481 jb = journal->j_list_bitmap + i;
482 if (jb->journal_list && jb->bitmaps[bmap_nr] &&
484 (unsigned long *)jb->bitmaps[bmap_nr]->
487 find_next_zero_bit((unsigned long *)
488 (jb->bitmaps[bmap_nr]->
490 sb->s_blocksize << 3,
497 bl = bmap_nr * (sb->s_blocksize << 3) + bit_nr;
498 /* is it in any old transactions? */
501 get_journal_hash_dev(sb, journal->j_list_hash_table, bl))) {
505 /* is it in the current transaction. This should never happen */
506 if ((cn = get_journal_hash_dev(sb, journal->j_hash_table, bl))) {
511 PROC_INFO_INC(sb, journal.in_journal_reusable);
516 /* insert cn into table */
517 static inline void insert_journal_hash(struct reiserfs_journal_cnode **table,
518 struct reiserfs_journal_cnode *cn)
520 struct reiserfs_journal_cnode *cn_orig;
522 cn_orig = journal_hash(table, cn->sb, cn->blocknr);
528 journal_hash(table, cn->sb, cn->blocknr) = cn;
531 /* lock the current transaction */
532 static inline void lock_journal(struct super_block *sb)
534 PROC_INFO_INC(sb, journal.lock_journal);
536 reiserfs_mutex_lock_safe(&SB_JOURNAL(sb)->j_mutex, sb);
539 /* unlock the current transaction */
540 static inline void unlock_journal(struct super_block *sb)
542 mutex_unlock(&SB_JOURNAL(sb)->j_mutex);
545 static inline void get_journal_list(struct reiserfs_journal_list *jl)
550 static inline void put_journal_list(struct super_block *s,
551 struct reiserfs_journal_list *jl)
553 if (jl->j_refcount < 1) {
554 reiserfs_panic(s, "journal-2", "trans id %u, refcount at %d",
555 jl->j_trans_id, jl->j_refcount);
557 if (--jl->j_refcount == 0)
562 * this used to be much more involved, and I'm keeping it just in case
563 * things get ugly again. it gets called by flush_commit_list, and
564 * cleans up any data stored about blocks freed during a transaction.
566 static void cleanup_freed_for_journal_list(struct super_block *sb,
567 struct reiserfs_journal_list *jl)
570 struct reiserfs_list_bitmap *jb = jl->j_list_bitmap;
572 cleanup_bitmap_list(sb, jb);
574 jl->j_list_bitmap->journal_list = NULL;
575 jl->j_list_bitmap = NULL;
578 static int journal_list_still_alive(struct super_block *s,
579 unsigned int trans_id)
581 struct reiserfs_journal *journal = SB_JOURNAL(s);
582 struct list_head *entry = &journal->j_journal_list;
583 struct reiserfs_journal_list *jl;
585 if (!list_empty(entry)) {
586 jl = JOURNAL_LIST_ENTRY(entry->next);
587 if (jl->j_trans_id <= trans_id) {
595 * If page->mapping was null, we failed to truncate this page for
596 * some reason. Most likely because it was truncated after being
597 * logged via data=journal.
599 * This does a check to see if the buffer belongs to one of these
600 * lost pages before doing the final put_bh. If page->mapping was
601 * null, it tries to free buffers on the page, which should make the
602 * final page_cache_release drop the page from the lru.
604 static void release_buffer_page(struct buffer_head *bh)
606 struct page *page = bh->b_page;
607 if (!page->mapping && trylock_page(page)) {
608 page_cache_get(page);
611 try_to_free_buffers(page);
613 page_cache_release(page);
619 static void reiserfs_end_buffer_io_sync(struct buffer_head *bh, int uptodate)
621 char b[BDEVNAME_SIZE];
623 if (buffer_journaled(bh)) {
624 reiserfs_warning(NULL, "clm-2084",
625 "pinned buffer %lu:%s sent to disk",
626 bh->b_blocknr, bdevname(bh->b_bdev, b));
629 set_buffer_uptodate(bh);
631 clear_buffer_uptodate(bh);
634 release_buffer_page(bh);
637 static void reiserfs_end_ordered_io(struct buffer_head *bh, int uptodate)
640 set_buffer_uptodate(bh);
642 clear_buffer_uptodate(bh);
647 static void submit_logged_buffer(struct buffer_head *bh)
650 bh->b_end_io = reiserfs_end_buffer_io_sync;
651 clear_buffer_journal_new(bh);
652 clear_buffer_dirty(bh);
653 if (!test_clear_buffer_journal_test(bh))
655 if (!buffer_uptodate(bh))
657 submit_bh(WRITE, bh);
660 static void submit_ordered_buffer(struct buffer_head *bh)
663 bh->b_end_io = reiserfs_end_ordered_io;
664 clear_buffer_dirty(bh);
665 if (!buffer_uptodate(bh))
667 submit_bh(WRITE, bh);
670 #define CHUNK_SIZE 32
671 struct buffer_chunk {
672 struct buffer_head *bh[CHUNK_SIZE];
676 static void write_chunk(struct buffer_chunk *chunk)
679 for (i = 0; i < chunk->nr; i++) {
680 submit_logged_buffer(chunk->bh[i]);
685 static void write_ordered_chunk(struct buffer_chunk *chunk)
688 for (i = 0; i < chunk->nr; i++) {
689 submit_ordered_buffer(chunk->bh[i]);
694 static int add_to_chunk(struct buffer_chunk *chunk, struct buffer_head *bh,
695 spinlock_t * lock, void (fn) (struct buffer_chunk *))
698 BUG_ON(chunk->nr >= CHUNK_SIZE);
699 chunk->bh[chunk->nr++] = bh;
700 if (chunk->nr >= CHUNK_SIZE) {
711 static atomic_t nr_reiserfs_jh = ATOMIC_INIT(0);
712 static struct reiserfs_jh *alloc_jh(void)
714 struct reiserfs_jh *jh;
716 jh = kmalloc(sizeof(*jh), GFP_NOFS);
718 atomic_inc(&nr_reiserfs_jh);
726 * we want to free the jh when the buffer has been written
729 void reiserfs_free_jh(struct buffer_head *bh)
731 struct reiserfs_jh *jh;
735 bh->b_private = NULL;
737 list_del_init(&jh->list);
739 if (atomic_read(&nr_reiserfs_jh) <= 0)
741 atomic_dec(&nr_reiserfs_jh);
746 static inline int __add_jh(struct reiserfs_journal *j, struct buffer_head *bh,
749 struct reiserfs_jh *jh;
752 spin_lock(&j->j_dirty_buffers_lock);
753 if (!bh->b_private) {
754 spin_unlock(&j->j_dirty_buffers_lock);
758 list_del_init(&jh->list);
763 spin_lock(&j->j_dirty_buffers_lock);
765 * buffer must be locked for __add_jh, should be able to have
766 * two adds at the same time
768 BUG_ON(bh->b_private);
772 jh->jl = j->j_current_jl;
774 list_add_tail(&jh->list, &jh->jl->j_tail_bh_list);
776 list_add_tail(&jh->list, &jh->jl->j_bh_list);
778 spin_unlock(&j->j_dirty_buffers_lock);
782 int reiserfs_add_tail_list(struct inode *inode, struct buffer_head *bh)
784 return __add_jh(SB_JOURNAL(inode->i_sb), bh, 1);
786 int reiserfs_add_ordered_list(struct inode *inode, struct buffer_head *bh)
788 return __add_jh(SB_JOURNAL(inode->i_sb), bh, 0);
791 #define JH_ENTRY(l) list_entry((l), struct reiserfs_jh, list)
792 static int write_ordered_buffers(spinlock_t * lock,
793 struct reiserfs_journal *j,
794 struct reiserfs_journal_list *jl,
795 struct list_head *list)
797 struct buffer_head *bh;
798 struct reiserfs_jh *jh;
799 int ret = j->j_errno;
800 struct buffer_chunk chunk;
801 struct list_head tmp;
802 INIT_LIST_HEAD(&tmp);
806 while (!list_empty(list)) {
807 jh = JH_ENTRY(list->next);
810 if (!trylock_buffer(bh)) {
811 if (!buffer_dirty(bh)) {
812 list_move(&jh->list, &tmp);
817 write_ordered_chunk(&chunk);
824 * in theory, dirty non-uptodate buffers should never get here,
825 * but the upper layer io error paths still have a few quirks.
826 * Handle them here as gracefully as we can
828 if (!buffer_uptodate(bh) && buffer_dirty(bh)) {
829 clear_buffer_dirty(bh);
832 if (buffer_dirty(bh)) {
833 list_move(&jh->list, &tmp);
834 add_to_chunk(&chunk, bh, lock, write_ordered_chunk);
836 reiserfs_free_jh(bh);
841 cond_resched_lock(lock);
845 write_ordered_chunk(&chunk);
848 while (!list_empty(&tmp)) {
849 jh = JH_ENTRY(tmp.prev);
852 reiserfs_free_jh(bh);
854 if (buffer_locked(bh)) {
859 if (!buffer_uptodate(bh)) {
863 * ugly interaction with invalidatepage here.
864 * reiserfs_invalidate_page will pin any buffer that has a
865 * valid journal head from an older transaction. If someone
866 * else sets our buffer dirty after we write it in the first
867 * loop, and then someone truncates the page away, nobody
868 * will ever write the buffer. We're safe if we write the
869 * page one last time after freeing the journal header.
871 if (buffer_dirty(bh) && unlikely(bh->b_page->mapping == NULL)) {
873 ll_rw_block(WRITE, 1, &bh);
877 cond_resched_lock(lock);
883 static int flush_older_commits(struct super_block *s,
884 struct reiserfs_journal_list *jl)
886 struct reiserfs_journal *journal = SB_JOURNAL(s);
887 struct reiserfs_journal_list *other_jl;
888 struct reiserfs_journal_list *first_jl;
889 struct list_head *entry;
890 unsigned int trans_id = jl->j_trans_id;
891 unsigned int other_trans_id;
892 unsigned int first_trans_id;
896 * first we walk backwards to find the oldest uncommitted transation
899 entry = jl->j_list.prev;
901 other_jl = JOURNAL_LIST_ENTRY(entry);
902 if (entry == &journal->j_journal_list ||
903 atomic_read(&other_jl->j_older_commits_done))
907 entry = other_jl->j_list.prev;
910 /* if we didn't find any older uncommitted transactions, return now */
911 if (first_jl == jl) {
915 first_trans_id = first_jl->j_trans_id;
917 entry = &first_jl->j_list;
919 other_jl = JOURNAL_LIST_ENTRY(entry);
920 other_trans_id = other_jl->j_trans_id;
922 if (other_trans_id < trans_id) {
923 if (atomic_read(&other_jl->j_commit_left) != 0) {
924 flush_commit_list(s, other_jl, 0);
926 /* list we were called with is gone, return */
927 if (!journal_list_still_alive(s, trans_id))
931 * the one we just flushed is gone, this means
932 * all older lists are also gone, so first_jl
933 * is no longer valid either. Go back to the
936 if (!journal_list_still_alive
937 (s, other_trans_id)) {
942 if (entry == &journal->j_journal_list)
951 static int reiserfs_async_progress_wait(struct super_block *s)
953 struct reiserfs_journal *j = SB_JOURNAL(s);
955 if (atomic_read(&j->j_async_throttle)) {
958 depth = reiserfs_write_unlock_nested(s);
959 congestion_wait(BLK_RW_ASYNC, HZ / 10);
960 reiserfs_write_lock_nested(s, depth);
967 * if this journal list still has commit blocks unflushed, send them to disk.
969 * log areas must be flushed in order (transaction 2 can't commit before
970 * transaction 1) Before the commit block can by written, every other log
971 * block must be safely on disk
973 static int flush_commit_list(struct super_block *s,
974 struct reiserfs_journal_list *jl, int flushall)
978 struct buffer_head *tbh = NULL;
979 unsigned int trans_id = jl->j_trans_id;
980 struct reiserfs_journal *journal = SB_JOURNAL(s);
985 reiserfs_check_lock_depth(s, "flush_commit_list");
987 if (atomic_read(&jl->j_older_commits_done)) {
992 * before we can put our commit blocks on disk, we have to make
993 * sure everyone older than us is on disk too
995 BUG_ON(jl->j_len <= 0);
996 BUG_ON(trans_id == journal->j_trans_id);
998 get_journal_list(jl);
1000 if (flush_older_commits(s, jl) == 1) {
1002 * list disappeared during flush_older_commits.
1009 /* make sure nobody is trying to flush this one at the same time */
1010 reiserfs_mutex_lock_safe(&jl->j_commit_mutex, s);
1012 if (!journal_list_still_alive(s, trans_id)) {
1013 mutex_unlock(&jl->j_commit_mutex);
1016 BUG_ON(jl->j_trans_id == 0);
1018 /* this commit is done, exit */
1019 if (atomic_read(&(jl->j_commit_left)) <= 0) {
1021 atomic_set(&(jl->j_older_commits_done), 1);
1023 mutex_unlock(&jl->j_commit_mutex);
1027 if (!list_empty(&jl->j_bh_list)) {
1031 * We might sleep in numerous places inside
1032 * write_ordered_buffers. Relax the write lock.
1034 depth = reiserfs_write_unlock_nested(s);
1035 ret = write_ordered_buffers(&journal->j_dirty_buffers_lock,
1036 journal, jl, &jl->j_bh_list);
1037 if (ret < 0 && retval == 0)
1039 reiserfs_write_lock_nested(s, depth);
1041 BUG_ON(!list_empty(&jl->j_bh_list));
1043 * for the description block and all the log blocks, submit any buffers
1044 * that haven't already reached the disk. Try to write at least 256
1045 * log blocks. later on, we will only wait on blocks that correspond
1046 * to this transaction, but while we're unplugging we might as well
1047 * get a chunk of data on there.
1049 atomic_inc(&journal->j_async_throttle);
1050 write_len = jl->j_len + 1;
1051 if (write_len < 256)
1053 for (i = 0 ; i < write_len ; i++) {
1054 bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) + (jl->j_start + i) %
1055 SB_ONDISK_JOURNAL_SIZE(s);
1056 tbh = journal_find_get_block(s, bn);
1058 if (buffer_dirty(tbh)) {
1059 depth = reiserfs_write_unlock_nested(s);
1060 ll_rw_block(WRITE, 1, &tbh);
1061 reiserfs_write_lock_nested(s, depth);
1066 atomic_dec(&journal->j_async_throttle);
1068 for (i = 0; i < (jl->j_len + 1); i++) {
1069 bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) +
1070 (jl->j_start + i) % SB_ONDISK_JOURNAL_SIZE(s);
1071 tbh = journal_find_get_block(s, bn);
1073 depth = reiserfs_write_unlock_nested(s);
1074 __wait_on_buffer(tbh);
1075 reiserfs_write_lock_nested(s, depth);
1077 * since we're using ll_rw_blk above, it might have skipped
1078 * over a locked buffer. Double check here
1080 /* redundant, sync_dirty_buffer() checks */
1081 if (buffer_dirty(tbh)) {
1082 depth = reiserfs_write_unlock_nested(s);
1083 sync_dirty_buffer(tbh);
1084 reiserfs_write_lock_nested(s, depth);
1086 if (unlikely(!buffer_uptodate(tbh))) {
1087 #ifdef CONFIG_REISERFS_CHECK
1088 reiserfs_warning(s, "journal-601",
1089 "buffer write failed");
1093 /* once for journal_find_get_block */
1095 /* once due to original getblk in do_journal_end */
1097 atomic_dec(&(jl->j_commit_left));
1100 BUG_ON(atomic_read(&(jl->j_commit_left)) != 1);
1103 * If there was a write error in the journal - we can't commit
1104 * this transaction - it will be invalid and, if successful,
1105 * will just end up propagating the write error out to
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 depth = reiserfs_write_unlock_nested(s);
1113 if (reiserfs_barrier_flush(s))
1114 __sync_dirty_buffer(jl->j_commit_bh, WRITE_FLUSH_FUA);
1116 sync_dirty_buffer(jl->j_commit_bh);
1117 reiserfs_write_lock_nested(s, depth);
1121 * If there was a write error in the journal - we can't commit this
1122 * transaction - it will be invalid and, if successful, will just end
1123 * up propagating the write error out to the filesystem.
1125 if (unlikely(!buffer_uptodate(jl->j_commit_bh))) {
1126 #ifdef CONFIG_REISERFS_CHECK
1127 reiserfs_warning(s, "journal-615", "buffer write failed");
1131 bforget(jl->j_commit_bh);
1132 if (journal->j_last_commit_id != 0 &&
1133 (jl->j_trans_id - journal->j_last_commit_id) != 1) {
1134 reiserfs_warning(s, "clm-2200", "last commit %lu, current %lu",
1135 journal->j_last_commit_id, jl->j_trans_id);
1137 journal->j_last_commit_id = jl->j_trans_id;
1140 * now, every commit block is on the disk. It is safe to allow
1141 * blocks freed during this transaction to be reallocated
1143 cleanup_freed_for_journal_list(s, jl);
1145 retval = retval ? retval : journal->j_errno;
1147 /* mark the metadata dirty */
1149 dirty_one_transaction(s, jl);
1150 atomic_dec(&(jl->j_commit_left));
1153 atomic_set(&(jl->j_older_commits_done), 1);
1155 mutex_unlock(&jl->j_commit_mutex);
1157 put_journal_list(s, jl);
1160 reiserfs_abort(s, retval, "Journal write error in %s",
1166 * flush_journal_list frequently needs to find a newer transaction for a
1167 * given block. This does that, or returns NULL if it can't find anything
1169 static struct reiserfs_journal_list *find_newer_jl_for_cn(struct
1170 reiserfs_journal_cnode
1173 struct super_block *sb = cn->sb;
1174 b_blocknr_t blocknr = cn->blocknr;
1178 if (cn->sb == sb && cn->blocknr == blocknr && cn->jlist) {
1186 static void remove_journal_hash(struct super_block *,
1187 struct reiserfs_journal_cnode **,
1188 struct reiserfs_journal_list *, unsigned long,
1192 * once all the real blocks have been flushed, it is safe to remove them
1193 * from the journal list for this transaction. Aside from freeing the
1194 * cnode, this also allows the block to be reallocated for data blocks
1195 * if it had been deleted.
1197 static void remove_all_from_journal_list(struct super_block *sb,
1198 struct reiserfs_journal_list *jl,
1201 struct reiserfs_journal *journal = SB_JOURNAL(sb);
1202 struct reiserfs_journal_cnode *cn, *last;
1203 cn = jl->j_realblock;
1206 * which is better, to lock once around the whole loop, or
1207 * to lock for each call to remove_journal_hash?
1210 if (cn->blocknr != 0) {
1212 reiserfs_warning(sb, "reiserfs-2201",
1213 "block %u, bh is %d, state %ld",
1214 cn->blocknr, cn->bh ? 1 : 0,
1218 remove_journal_hash(sb, journal->j_list_hash_table,
1219 jl, cn->blocknr, 1);
1223 free_cnode(sb, last);
1225 jl->j_realblock = NULL;
1229 * if this timestamp is greater than the timestamp we wrote last to the
1230 * header block, write it to the header block. once this is done, I can
1231 * safely say the log area for this transaction won't ever be replayed,
1232 * and I can start releasing blocks in this transaction for reuse as data
1233 * blocks. called by flush_journal_list, before it calls
1234 * remove_all_from_journal_list
1236 static int _update_journal_header_block(struct super_block *sb,
1237 unsigned long offset,
1238 unsigned int trans_id)
1240 struct reiserfs_journal_header *jh;
1241 struct reiserfs_journal *journal = SB_JOURNAL(sb);
1244 if (reiserfs_is_journal_aborted(journal))
1247 if (trans_id >= journal->j_last_flush_trans_id) {
1248 if (buffer_locked((journal->j_header_bh))) {
1249 depth = reiserfs_write_unlock_nested(sb);
1250 __wait_on_buffer(journal->j_header_bh);
1251 reiserfs_write_lock_nested(sb, depth);
1252 if (unlikely(!buffer_uptodate(journal->j_header_bh))) {
1253 #ifdef CONFIG_REISERFS_CHECK
1254 reiserfs_warning(sb, "journal-699",
1255 "buffer write failed");
1260 journal->j_last_flush_trans_id = trans_id;
1261 journal->j_first_unflushed_offset = offset;
1262 jh = (struct reiserfs_journal_header *)(journal->j_header_bh->
1264 jh->j_last_flush_trans_id = cpu_to_le32(trans_id);
1265 jh->j_first_unflushed_offset = cpu_to_le32(offset);
1266 jh->j_mount_id = cpu_to_le32(journal->j_mount_id);
1268 set_buffer_dirty(journal->j_header_bh);
1269 depth = reiserfs_write_unlock_nested(sb);
1271 if (reiserfs_barrier_flush(sb))
1272 __sync_dirty_buffer(journal->j_header_bh, WRITE_FLUSH_FUA);
1274 sync_dirty_buffer(journal->j_header_bh);
1276 reiserfs_write_lock_nested(sb, depth);
1277 if (!buffer_uptodate(journal->j_header_bh)) {
1278 reiserfs_warning(sb, "journal-837",
1279 "IO error during journal replay");
1286 static int update_journal_header_block(struct super_block *sb,
1287 unsigned long offset,
1288 unsigned int trans_id)
1290 return _update_journal_header_block(sb, offset, trans_id);
1294 ** flush any and all journal lists older than you are
1295 ** can only be called from flush_journal_list
1297 static int flush_older_journal_lists(struct super_block *sb,
1298 struct reiserfs_journal_list *jl)
1300 struct list_head *entry;
1301 struct reiserfs_journal_list *other_jl;
1302 struct reiserfs_journal *journal = SB_JOURNAL(sb);
1303 unsigned int trans_id = jl->j_trans_id;
1306 * we know we are the only ones flushing things, no extra race
1307 * protection is required.
1310 entry = journal->j_journal_list.next;
1312 if (entry == &journal->j_journal_list)
1314 other_jl = JOURNAL_LIST_ENTRY(entry);
1315 if (other_jl->j_trans_id < trans_id) {
1316 BUG_ON(other_jl->j_refcount <= 0);
1317 /* do not flush all */
1318 flush_journal_list(sb, other_jl, 0);
1320 /* other_jl is now deleted from the list */
1326 static void del_from_work_list(struct super_block *s,
1327 struct reiserfs_journal_list *jl)
1329 struct reiserfs_journal *journal = SB_JOURNAL(s);
1330 if (!list_empty(&jl->j_working_list)) {
1331 list_del_init(&jl->j_working_list);
1332 journal->j_num_work_lists--;
1337 * flush a journal list, both commit and real blocks
1339 * always set flushall to 1, unless you are calling from inside
1340 * flush_journal_list
1342 * IMPORTANT. This can only be called while there are no journal writers,
1343 * and the journal is locked. That means it can only be called from
1344 * do_journal_end, or by journal_release
1346 static int flush_journal_list(struct super_block *s,
1347 struct reiserfs_journal_list *jl, int flushall)
1349 struct reiserfs_journal_list *pjl;
1350 struct reiserfs_journal_cnode *cn, *last;
1354 struct buffer_head *saved_bh;
1355 unsigned long j_len_saved = jl->j_len;
1356 struct reiserfs_journal *journal = SB_JOURNAL(s);
1360 BUG_ON(j_len_saved <= 0);
1362 if (atomic_read(&journal->j_wcount) != 0) {
1363 reiserfs_warning(s, "clm-2048", "called with wcount %d",
1364 atomic_read(&journal->j_wcount));
1367 /* if flushall == 0, the lock is already held */
1369 reiserfs_mutex_lock_safe(&journal->j_flush_mutex, s);
1370 } else if (mutex_trylock(&journal->j_flush_mutex)) {
1375 if (j_len_saved > journal->j_trans_max) {
1376 reiserfs_panic(s, "journal-715", "length is %lu, trans id %lu",
1377 j_len_saved, jl->j_trans_id);
1381 /* if all the work is already done, get out of here */
1382 if (atomic_read(&(jl->j_nonzerolen)) <= 0 &&
1383 atomic_read(&(jl->j_commit_left)) <= 0) {
1384 goto flush_older_and_return;
1388 * start by putting the commit list on disk. This will also flush
1389 * the commit lists of any olders transactions
1391 flush_commit_list(s, jl, 1);
1393 if (!(jl->j_state & LIST_DIRTY)
1394 && !reiserfs_is_journal_aborted(journal))
1397 /* are we done now? */
1398 if (atomic_read(&(jl->j_nonzerolen)) <= 0 &&
1399 atomic_read(&(jl->j_commit_left)) <= 0) {
1400 goto flush_older_and_return;
1404 * loop through each cnode, see if we need to write it,
1405 * or wait on a more recent transaction, or just ignore it
1407 if (atomic_read(&(journal->j_wcount)) != 0) {
1408 reiserfs_panic(s, "journal-844", "journal list is flushing, "
1411 cn = jl->j_realblock;
1416 /* blocknr of 0 is no longer in the hash, ignore it */
1417 if (cn->blocknr == 0) {
1422 * This transaction failed commit.
1423 * Don't write out to the disk
1425 if (!(jl->j_state & LIST_DIRTY))
1428 pjl = find_newer_jl_for_cn(cn);
1430 * the order is important here. We check pjl to make sure we
1431 * don't clear BH_JDirty_wait if we aren't the one writing this
1434 if (!pjl && cn->bh) {
1438 * we do this to make sure nobody releases the
1439 * buffer while we are working with it
1443 if (buffer_journal_dirty(saved_bh)) {
1444 BUG_ON(!can_dirty(cn));
1447 } else if (can_dirty(cn)) {
1449 * everything with !pjl && jwait
1450 * should be writable
1457 * if someone has this block in a newer transaction, just make
1458 * sure they are committed, and don't try writing it to disk
1461 if (atomic_read(&pjl->j_commit_left))
1462 flush_commit_list(s, pjl, 1);
1467 * bh == NULL when the block got to disk on its own, OR,
1468 * the block got freed in a future transaction
1470 if (saved_bh == NULL) {
1475 * this should never happen. kupdate_one_transaction has
1476 * this list locked while it works, so we should never see a
1477 * buffer here that is not marked JDirty_wait
1479 if ((!was_jwait) && !buffer_locked(saved_bh)) {
1480 reiserfs_warning(s, "journal-813",
1481 "BAD! buffer %llu %cdirty %cjwait, "
1482 "not in a newer tranasction",
1483 (unsigned long long)saved_bh->
1484 b_blocknr, was_dirty ? ' ' : '!',
1485 was_jwait ? ' ' : '!');
1489 * we inc again because saved_bh gets decremented
1493 set_bit(BLOCK_NEEDS_FLUSH, &cn->state);
1494 lock_buffer(saved_bh);
1495 BUG_ON(cn->blocknr != saved_bh->b_blocknr);
1496 if (buffer_dirty(saved_bh))
1497 submit_logged_buffer(saved_bh);
1499 unlock_buffer(saved_bh);
1502 reiserfs_warning(s, "clm-2082",
1503 "Unable to flush buffer %llu in %s",
1504 (unsigned long long)saved_bh->
1505 b_blocknr, __func__);
1512 * we incremented this to keep others from
1513 * taking the buffer head away
1516 if (atomic_read(&(saved_bh->b_count)) < 0) {
1517 reiserfs_warning(s, "journal-945",
1518 "saved_bh->b_count < 0");
1523 cn = jl->j_realblock;
1525 if (test_bit(BLOCK_NEEDS_FLUSH, &cn->state)) {
1527 reiserfs_panic(s, "journal-1011",
1531 depth = reiserfs_write_unlock_nested(s);
1532 __wait_on_buffer(cn->bh);
1533 reiserfs_write_lock_nested(s, depth);
1536 reiserfs_panic(s, "journal-1012",
1539 if (unlikely(!buffer_uptodate(cn->bh))) {
1540 #ifdef CONFIG_REISERFS_CHECK
1541 reiserfs_warning(s, "journal-949",
1542 "buffer write failed");
1547 * note, we must clear the JDirty_wait bit
1548 * after the up to date check, otherwise we
1549 * race against our flushpage routine
1551 BUG_ON(!test_clear_buffer_journal_dirty
1554 /* drop one ref for us */
1556 /* drop one ref for journal_mark_dirty */
1557 release_buffer_page(cn->bh);
1564 reiserfs_abort(s, -EIO,
1565 "Write error while pushing transaction to disk in %s",
1567 flush_older_and_return:
1570 * before we can update the journal header block, we _must_ flush all
1571 * real blocks from all older transactions to disk. This is because
1572 * once the header block is updated, this transaction will not be
1573 * replayed after a crash
1576 flush_older_journal_lists(s, jl);
1579 err = journal->j_errno;
1581 * before we can remove everything from the hash tables for this
1582 * transaction, we must make sure it can never be replayed
1584 * since we are only called from do_journal_end, we know for sure there
1585 * are no allocations going on while we are flushing journal lists. So,
1586 * we only need to update the journal header block for the last list
1589 if (!err && flushall) {
1591 update_journal_header_block(s,
1592 (jl->j_start + jl->j_len +
1593 2) % SB_ONDISK_JOURNAL_SIZE(s),
1596 reiserfs_abort(s, -EIO,
1597 "Write error while updating journal header in %s",
1600 remove_all_from_journal_list(s, jl, 0);
1601 list_del_init(&jl->j_list);
1602 journal->j_num_lists--;
1603 del_from_work_list(s, jl);
1605 if (journal->j_last_flush_id != 0 &&
1606 (jl->j_trans_id - journal->j_last_flush_id) != 1) {
1607 reiserfs_warning(s, "clm-2201", "last flush %lu, current %lu",
1608 journal->j_last_flush_id, jl->j_trans_id);
1610 journal->j_last_flush_id = jl->j_trans_id;
1613 * not strictly required since we are freeing the list, but it should
1614 * help find code using dead lists later on
1617 atomic_set(&(jl->j_nonzerolen), 0);
1619 jl->j_realblock = NULL;
1620 jl->j_commit_bh = NULL;
1623 put_journal_list(s, jl);
1625 mutex_unlock(&journal->j_flush_mutex);
1629 static int write_one_transaction(struct super_block *s,
1630 struct reiserfs_journal_list *jl,
1631 struct buffer_chunk *chunk)
1633 struct reiserfs_journal_cnode *cn;
1636 jl->j_state |= LIST_TOUCHED;
1637 del_from_work_list(s, jl);
1638 if (jl->j_len == 0 || atomic_read(&jl->j_nonzerolen) == 0) {
1642 cn = jl->j_realblock;
1645 * if the blocknr == 0, this has been cleared from the hash,
1648 if (cn->blocknr == 0) {
1651 if (cn->bh && can_dirty(cn) && buffer_dirty(cn->bh)) {
1652 struct buffer_head *tmp_bh;
1654 * we can race against journal_mark_freed when we try
1655 * to lock_buffer(cn->bh), so we have to inc the buffer
1656 * count, and recheck things after locking
1660 lock_buffer(tmp_bh);
1661 if (cn->bh && can_dirty(cn) && buffer_dirty(tmp_bh)) {
1662 if (!buffer_journal_dirty(tmp_bh) ||
1663 buffer_journal_prepared(tmp_bh))
1665 add_to_chunk(chunk, tmp_bh, NULL, write_chunk);
1668 /* note, cn->bh might be null now */
1669 unlock_buffer(tmp_bh);
1680 /* used by flush_commit_list */
1681 static int dirty_one_transaction(struct super_block *s,
1682 struct reiserfs_journal_list *jl)
1684 struct reiserfs_journal_cnode *cn;
1685 struct reiserfs_journal_list *pjl;
1688 jl->j_state |= LIST_DIRTY;
1689 cn = jl->j_realblock;
1692 * look for a more recent transaction that logged this
1693 * buffer. Only the most recent transaction with a buffer in
1694 * it is allowed to send that buffer to disk
1696 pjl = find_newer_jl_for_cn(cn);
1697 if (!pjl && cn->blocknr && cn->bh
1698 && buffer_journal_dirty(cn->bh)) {
1699 BUG_ON(!can_dirty(cn));
1701 * if the buffer is prepared, it will either be logged
1702 * or restored. If restored, we need to make sure
1703 * it actually gets marked dirty
1705 clear_buffer_journal_new(cn->bh);
1706 if (buffer_journal_prepared(cn->bh)) {
1707 set_buffer_journal_restore_dirty(cn->bh);
1709 set_buffer_journal_test(cn->bh);
1710 mark_buffer_dirty(cn->bh);
1718 static int kupdate_transactions(struct super_block *s,
1719 struct reiserfs_journal_list *jl,
1720 struct reiserfs_journal_list **next_jl,
1721 unsigned int *next_trans_id,
1722 int num_blocks, int num_trans)
1726 int transactions_flushed = 0;
1727 unsigned int orig_trans_id = jl->j_trans_id;
1728 struct buffer_chunk chunk;
1729 struct list_head *entry;
1730 struct reiserfs_journal *journal = SB_JOURNAL(s);
1733 reiserfs_mutex_lock_safe(&journal->j_flush_mutex, s);
1734 if (!journal_list_still_alive(s, orig_trans_id)) {
1739 * we've got j_flush_mutex held, nobody is going to delete any
1740 * of these lists out from underneath us
1742 while ((num_trans && transactions_flushed < num_trans) ||
1743 (!num_trans && written < num_blocks)) {
1745 if (jl->j_len == 0 || (jl->j_state & LIST_TOUCHED) ||
1746 atomic_read(&jl->j_commit_left)
1747 || !(jl->j_state & LIST_DIRTY)) {
1748 del_from_work_list(s, jl);
1751 ret = write_one_transaction(s, jl, &chunk);
1755 transactions_flushed++;
1757 entry = jl->j_list.next;
1760 if (entry == &journal->j_journal_list) {
1763 jl = JOURNAL_LIST_ENTRY(entry);
1765 /* don't bother with older transactions */
1766 if (jl->j_trans_id <= orig_trans_id)
1770 write_chunk(&chunk);
1774 mutex_unlock(&journal->j_flush_mutex);
1779 * for o_sync and fsync heavy applications, they tend to use
1780 * all the journa list slots with tiny transactions. These
1781 * trigger lots and lots of calls to update the header block, which
1782 * adds seeks and slows things down.
1784 * This function tries to clear out a large chunk of the journal lists
1785 * at once, which makes everything faster since only the newest journal
1786 * list updates the header block
1788 static int flush_used_journal_lists(struct super_block *s,
1789 struct reiserfs_journal_list *jl)
1791 unsigned long len = 0;
1792 unsigned long cur_len;
1796 struct reiserfs_journal_list *tjl;
1797 struct reiserfs_journal_list *flush_jl;
1798 unsigned int trans_id;
1799 struct reiserfs_journal *journal = SB_JOURNAL(s);
1801 flush_jl = tjl = jl;
1803 /* in data logging mode, try harder to flush a lot of blocks */
1804 if (reiserfs_data_log(s))
1806 /* flush for 256 transactions or limit blocks, whichever comes first */
1807 for (i = 0; i < 256 && len < limit; i++) {
1808 if (atomic_read(&tjl->j_commit_left) ||
1809 tjl->j_trans_id < jl->j_trans_id) {
1812 cur_len = atomic_read(&tjl->j_nonzerolen);
1814 tjl->j_state &= ~LIST_TOUCHED;
1818 if (tjl->j_list.next == &journal->j_journal_list)
1820 tjl = JOURNAL_LIST_ENTRY(tjl->j_list.next);
1822 get_journal_list(jl);
1823 get_journal_list(flush_jl);
1826 * try to find a group of blocks we can flush across all the
1827 * transactions, but only bother if we've actually spanned
1828 * across multiple lists
1830 if (flush_jl != jl) {
1831 ret = kupdate_transactions(s, jl, &tjl, &trans_id, len, i);
1833 flush_journal_list(s, flush_jl, 1);
1834 put_journal_list(s, flush_jl);
1835 put_journal_list(s, jl);
1840 * removes any nodes in table with name block and dev as bh.
1841 * only touchs the hnext and hprev pointers.
1843 void remove_journal_hash(struct super_block *sb,
1844 struct reiserfs_journal_cnode **table,
1845 struct reiserfs_journal_list *jl,
1846 unsigned long block, int remove_freed)
1848 struct reiserfs_journal_cnode *cur;
1849 struct reiserfs_journal_cnode **head;
1851 head = &(journal_hash(table, sb, block));
1857 if (cur->blocknr == block && cur->sb == sb
1858 && (jl == NULL || jl == cur->jlist)
1859 && (!test_bit(BLOCK_FREED, &cur->state) || remove_freed)) {
1861 cur->hnext->hprev = cur->hprev;
1864 cur->hprev->hnext = cur->hnext;
1872 * anybody who clears the cur->bh will also
1873 * dec the nonzerolen
1875 if (cur->bh && cur->jlist)
1876 atomic_dec(&(cur->jlist->j_nonzerolen));
1884 static void free_journal_ram(struct super_block *sb)
1886 struct reiserfs_journal *journal = SB_JOURNAL(sb);
1887 kfree(journal->j_current_jl);
1888 journal->j_num_lists--;
1890 vfree(journal->j_cnode_free_orig);
1891 free_list_bitmaps(sb, journal->j_list_bitmap);
1892 free_bitmap_nodes(sb); /* must be after free_list_bitmaps */
1893 if (journal->j_header_bh) {
1894 brelse(journal->j_header_bh);
1897 * j_header_bh is on the journal dev, make sure
1898 * not to release the journal dev until we brelse j_header_bh
1900 release_journal_dev(sb, journal);
1905 * call on unmount. Only set error to 1 if you haven't made your way out
1906 * of read_super() yet. Any other caller must keep error at 0.
1908 static int do_journal_release(struct reiserfs_transaction_handle *th,
1909 struct super_block *sb, int error)
1911 struct reiserfs_transaction_handle myth;
1913 struct reiserfs_journal *journal = SB_JOURNAL(sb);
1916 * we only want to flush out transactions if we were
1917 * called with error == 0
1919 if (!error && !(sb->s_flags & MS_RDONLY)) {
1920 /* end the current trans */
1921 BUG_ON(!th->t_trans_id);
1922 do_journal_end(th, FLUSH_ALL);
1925 * make sure something gets logged to force
1926 * our way into the flush code
1928 if (!journal_join(&myth, sb)) {
1929 reiserfs_prepare_for_journal(sb,
1930 SB_BUFFER_WITH_SB(sb),
1932 journal_mark_dirty(&myth, SB_BUFFER_WITH_SB(sb));
1933 do_journal_end(&myth, FLUSH_ALL);
1938 /* this also catches errors during the do_journal_end above */
1939 if (!error && reiserfs_is_journal_aborted(journal)) {
1940 memset(&myth, 0, sizeof(myth));
1941 if (!journal_join_abort(&myth, sb)) {
1942 reiserfs_prepare_for_journal(sb,
1943 SB_BUFFER_WITH_SB(sb),
1945 journal_mark_dirty(&myth, SB_BUFFER_WITH_SB(sb));
1946 do_journal_end(&myth, FLUSH_ALL);
1950 /* wait for all commits to finish */
1951 cancel_delayed_work(&SB_JOURNAL(sb)->j_work);
1954 * We must release the write lock here because
1955 * the workqueue job (flush_async_commit) needs this lock
1957 reiserfs_write_unlock(sb);
1959 cancel_delayed_work_sync(&REISERFS_SB(sb)->old_work);
1960 flush_workqueue(REISERFS_SB(sb)->commit_wq);
1962 free_journal_ram(sb);
1964 reiserfs_write_lock(sb);
1969 /* * call on unmount. flush all journal trans, release all alloc'd ram */
1970 int journal_release(struct reiserfs_transaction_handle *th,
1971 struct super_block *sb)
1973 return do_journal_release(th, sb, 0);
1976 /* only call from an error condition inside reiserfs_read_super! */
1977 int journal_release_error(struct reiserfs_transaction_handle *th,
1978 struct super_block *sb)
1980 return do_journal_release(th, sb, 1);
1984 * compares description block with commit block.
1985 * returns 1 if they differ, 0 if they are the same
1987 static int journal_compare_desc_commit(struct super_block *sb,
1988 struct reiserfs_journal_desc *desc,
1989 struct reiserfs_journal_commit *commit)
1991 if (get_commit_trans_id(commit) != get_desc_trans_id(desc) ||
1992 get_commit_trans_len(commit) != get_desc_trans_len(desc) ||
1993 get_commit_trans_len(commit) > SB_JOURNAL(sb)->j_trans_max ||
1994 get_commit_trans_len(commit) <= 0) {
2001 * returns 0 if it did not find a description block
2002 * returns -1 if it found a corrupt commit block
2003 * returns 1 if both desc and commit were valid
2004 * NOTE: only called during fs mount
2006 static int journal_transaction_is_valid(struct super_block *sb,
2007 struct buffer_head *d_bh,
2008 unsigned int *oldest_invalid_trans_id,
2009 unsigned long *newest_mount_id)
2011 struct reiserfs_journal_desc *desc;
2012 struct reiserfs_journal_commit *commit;
2013 struct buffer_head *c_bh;
2014 unsigned long offset;
2019 desc = (struct reiserfs_journal_desc *)d_bh->b_data;
2020 if (get_desc_trans_len(desc) > 0
2021 && !memcmp(get_journal_desc_magic(d_bh), JOURNAL_DESC_MAGIC, 8)) {
2022 if (oldest_invalid_trans_id && *oldest_invalid_trans_id
2023 && get_desc_trans_id(desc) > *oldest_invalid_trans_id) {
2024 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2025 "journal-986: transaction "
2026 "is valid returning because trans_id %d is greater than "
2027 "oldest_invalid %lu",
2028 get_desc_trans_id(desc),
2029 *oldest_invalid_trans_id);
2033 && *newest_mount_id > get_desc_mount_id(desc)) {
2034 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2035 "journal-1087: transaction "
2036 "is valid returning because mount_id %d is less than "
2037 "newest_mount_id %lu",
2038 get_desc_mount_id(desc),
2042 if (get_desc_trans_len(desc) > SB_JOURNAL(sb)->j_trans_max) {
2043 reiserfs_warning(sb, "journal-2018",
2044 "Bad transaction length %d "
2045 "encountered, ignoring transaction",
2046 get_desc_trans_len(desc));
2049 offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2052 * ok, we have a journal description block,
2053 * let's see if the transaction was valid
2057 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2058 ((offset + get_desc_trans_len(desc) +
2059 1) % SB_ONDISK_JOURNAL_SIZE(sb)));
2062 commit = (struct reiserfs_journal_commit *)c_bh->b_data;
2063 if (journal_compare_desc_commit(sb, desc, commit)) {
2064 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2065 "journal_transaction_is_valid, commit offset %ld had bad "
2066 "time %d or length %d",
2068 SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2069 get_commit_trans_id(commit),
2070 get_commit_trans_len(commit));
2072 if (oldest_invalid_trans_id) {
2073 *oldest_invalid_trans_id =
2074 get_desc_trans_id(desc);
2075 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2077 "transaction_is_valid setting oldest invalid trans_id "
2079 get_desc_trans_id(desc));
2084 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2085 "journal-1006: found valid "
2086 "transaction start offset %llu, len %d id %d",
2088 SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2089 get_desc_trans_len(desc),
2090 get_desc_trans_id(desc));
2097 static void brelse_array(struct buffer_head **heads, int num)
2100 for (i = 0; i < num; i++) {
2106 * given the start, and values for the oldest acceptable transactions,
2107 * this either reads in a replays a transaction, or returns because the
2108 * transaction is invalid, or too old.
2109 * NOTE: only called during fs mount
2111 static int journal_read_transaction(struct super_block *sb,
2112 unsigned long cur_dblock,
2113 unsigned long oldest_start,
2114 unsigned int oldest_trans_id,
2115 unsigned long newest_mount_id)
2117 struct reiserfs_journal *journal = SB_JOURNAL(sb);
2118 struct reiserfs_journal_desc *desc;
2119 struct reiserfs_journal_commit *commit;
2120 unsigned int trans_id = 0;
2121 struct buffer_head *c_bh;
2122 struct buffer_head *d_bh;
2123 struct buffer_head **log_blocks = NULL;
2124 struct buffer_head **real_blocks = NULL;
2125 unsigned int trans_offset;
2129 d_bh = journal_bread(sb, cur_dblock);
2132 desc = (struct reiserfs_journal_desc *)d_bh->b_data;
2133 trans_offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2134 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1037: "
2135 "journal_read_transaction, offset %llu, len %d mount_id %d",
2136 d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2137 get_desc_trans_len(desc), get_desc_mount_id(desc));
2138 if (get_desc_trans_id(desc) < oldest_trans_id) {
2139 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1039: "
2140 "journal_read_trans skipping because %lu is too old",
2142 SB_ONDISK_JOURNAL_1st_BLOCK(sb));
2146 if (get_desc_mount_id(desc) != newest_mount_id) {
2147 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1146: "
2148 "journal_read_trans skipping because %d is != "
2149 "newest_mount_id %lu", get_desc_mount_id(desc),
2154 c_bh = journal_bread(sb, SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2155 ((trans_offset + get_desc_trans_len(desc) + 1) %
2156 SB_ONDISK_JOURNAL_SIZE(sb)));
2161 commit = (struct reiserfs_journal_commit *)c_bh->b_data;
2162 if (journal_compare_desc_commit(sb, desc, commit)) {
2163 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2164 "journal_read_transaction, "
2165 "commit offset %llu had bad time %d or length %d",
2167 SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2168 get_commit_trans_id(commit),
2169 get_commit_trans_len(commit));
2175 if (bdev_read_only(sb->s_bdev)) {
2176 reiserfs_warning(sb, "clm-2076",
2177 "device is readonly, unable to replay log");
2183 trans_id = get_desc_trans_id(desc);
2185 * now we know we've got a good transaction, and it was
2186 * inside the valid time ranges
2188 log_blocks = kmalloc(get_desc_trans_len(desc) *
2189 sizeof(struct buffer_head *), GFP_NOFS);
2190 real_blocks = kmalloc(get_desc_trans_len(desc) *
2191 sizeof(struct buffer_head *), GFP_NOFS);
2192 if (!log_blocks || !real_blocks) {
2197 reiserfs_warning(sb, "journal-1169",
2198 "kmalloc failed, unable to mount FS");
2201 /* get all the buffer heads */
2202 trans_half = journal_trans_half(sb->s_blocksize);
2203 for (i = 0; i < get_desc_trans_len(desc); i++) {
2206 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2208 i) % SB_ONDISK_JOURNAL_SIZE(sb));
2209 if (i < trans_half) {
2212 le32_to_cpu(desc->j_realblock[i]));
2216 le32_to_cpu(commit->
2217 j_realblock[i - trans_half]));
2219 if (real_blocks[i]->b_blocknr > SB_BLOCK_COUNT(sb)) {
2220 reiserfs_warning(sb, "journal-1207",
2221 "REPLAY FAILURE fsck required! "
2222 "Block to replay is outside of "
2226 /* make sure we don't try to replay onto log or reserved area */
2227 if (is_block_in_log_or_reserved_area
2228 (sb, real_blocks[i]->b_blocknr)) {
2229 reiserfs_warning(sb, "journal-1204",
2230 "REPLAY FAILURE fsck required! "
2231 "Trying to replay onto a log block");
2233 brelse_array(log_blocks, i);
2234 brelse_array(real_blocks, i);
2242 /* read in the log blocks, memcpy to the corresponding real block */
2243 ll_rw_block(READ, get_desc_trans_len(desc), log_blocks);
2244 for (i = 0; i < get_desc_trans_len(desc); i++) {
2246 wait_on_buffer(log_blocks[i]);
2247 if (!buffer_uptodate(log_blocks[i])) {
2248 reiserfs_warning(sb, "journal-1212",
2249 "REPLAY FAILURE fsck required! "
2250 "buffer write failed");
2251 brelse_array(log_blocks + i,
2252 get_desc_trans_len(desc) - i);
2253 brelse_array(real_blocks, get_desc_trans_len(desc));
2260 memcpy(real_blocks[i]->b_data, log_blocks[i]->b_data,
2261 real_blocks[i]->b_size);
2262 set_buffer_uptodate(real_blocks[i]);
2263 brelse(log_blocks[i]);
2265 /* flush out the real blocks */
2266 for (i = 0; i < get_desc_trans_len(desc); i++) {
2267 set_buffer_dirty(real_blocks[i]);
2268 write_dirty_buffer(real_blocks[i], WRITE);
2270 for (i = 0; i < get_desc_trans_len(desc); i++) {
2271 wait_on_buffer(real_blocks[i]);
2272 if (!buffer_uptodate(real_blocks[i])) {
2273 reiserfs_warning(sb, "journal-1226",
2274 "REPLAY FAILURE, fsck required! "
2275 "buffer write failed");
2276 brelse_array(real_blocks + i,
2277 get_desc_trans_len(desc) - i);
2284 brelse(real_blocks[i]);
2287 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2288 ((trans_offset + get_desc_trans_len(desc) +
2289 2) % SB_ONDISK_JOURNAL_SIZE(sb));
2290 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2291 "journal-1095: setting journal " "start to offset %ld",
2292 cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb));
2295 * init starting values for the first transaction, in case
2296 * this is the last transaction to be replayed.
2298 journal->j_start = cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2299 journal->j_last_flush_trans_id = trans_id;
2300 journal->j_trans_id = trans_id + 1;
2301 /* check for trans_id overflow */
2302 if (journal->j_trans_id == 0)
2303 journal->j_trans_id = 10;
2312 * This function reads blocks starting from block and to max_block of bufsize
2313 * size (but no more than BUFNR blocks at a time). This proved to improve
2314 * mounting speed on self-rebuilding raid5 arrays at least.
2315 * Right now it is only used from journal code. But later we might use it
2316 * from other places.
2317 * Note: Do not use journal_getblk/sb_getblk functions here!
2319 static struct buffer_head *reiserfs_breada(struct block_device *dev,
2320 b_blocknr_t block, int bufsize,
2321 b_blocknr_t max_block)
2323 struct buffer_head *bhlist[BUFNR];
2324 unsigned int blocks = BUFNR;
2325 struct buffer_head *bh;
2328 bh = __getblk(dev, block, bufsize);
2329 if (buffer_uptodate(bh))
2332 if (block + BUFNR > max_block) {
2333 blocks = max_block - block;
2337 for (i = 1; i < blocks; i++) {
2338 bh = __getblk(dev, block + i, bufsize);
2339 if (buffer_uptodate(bh)) {
2345 ll_rw_block(READ, j, bhlist);
2346 for (i = 1; i < j; i++)
2350 if (buffer_uptodate(bh))
2357 * read and replay the log
2358 * on a clean unmount, the journal header's next unflushed pointer will be
2359 * to an invalid transaction. This tests that before finding all the
2360 * transactions in the log, which makes normal mount times fast.
2362 * After a crash, this starts with the next unflushed transaction, and
2363 * replays until it finds one too old, or invalid.
2365 * On exit, it sets things up so the first transaction will work correctly.
2366 * NOTE: only called during fs mount
2368 static int journal_read(struct super_block *sb)
2370 struct reiserfs_journal *journal = SB_JOURNAL(sb);
2371 struct reiserfs_journal_desc *desc;
2372 unsigned int oldest_trans_id = 0;
2373 unsigned int oldest_invalid_trans_id = 0;
2375 unsigned long oldest_start = 0;
2376 unsigned long cur_dblock = 0;
2377 unsigned long newest_mount_id = 9;
2378 struct buffer_head *d_bh;
2379 struct reiserfs_journal_header *jh;
2380 int valid_journal_header = 0;
2381 int replay_count = 0;
2382 int continue_replay = 1;
2384 char b[BDEVNAME_SIZE];
2386 cur_dblock = SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2387 reiserfs_info(sb, "checking transaction log (%s)\n",
2388 bdevname(journal->j_dev_bd, b));
2389 start = get_seconds();
2392 * step 1, read in the journal header block. Check the transaction
2393 * it says is the first unflushed, and if that transaction is not
2394 * valid, replay is done
2396 journal->j_header_bh = journal_bread(sb,
2397 SB_ONDISK_JOURNAL_1st_BLOCK(sb)
2398 + SB_ONDISK_JOURNAL_SIZE(sb));
2399 if (!journal->j_header_bh) {
2402 jh = (struct reiserfs_journal_header *)(journal->j_header_bh->b_data);
2403 if (le32_to_cpu(jh->j_first_unflushed_offset) <
2404 SB_ONDISK_JOURNAL_SIZE(sb)
2405 && le32_to_cpu(jh->j_last_flush_trans_id) > 0) {
2407 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2408 le32_to_cpu(jh->j_first_unflushed_offset);
2409 oldest_trans_id = le32_to_cpu(jh->j_last_flush_trans_id) + 1;
2410 newest_mount_id = le32_to_cpu(jh->j_mount_id);
2411 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2412 "journal-1153: found in "
2413 "header: first_unflushed_offset %d, last_flushed_trans_id "
2414 "%lu", le32_to_cpu(jh->j_first_unflushed_offset),
2415 le32_to_cpu(jh->j_last_flush_trans_id));
2416 valid_journal_header = 1;
2419 * now, we try to read the first unflushed offset. If it
2420 * is not valid, there is nothing more we can do, and it
2421 * makes no sense to read through the whole log.
2425 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2426 le32_to_cpu(jh->j_first_unflushed_offset));
2427 ret = journal_transaction_is_valid(sb, d_bh, NULL, NULL);
2429 continue_replay = 0;
2432 goto start_log_replay;
2436 * ok, there are transactions that need to be replayed. start
2437 * with the first log block, find all the valid transactions, and
2438 * pick out the oldest.
2440 while (continue_replay
2442 (SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2443 SB_ONDISK_JOURNAL_SIZE(sb))) {
2445 * Note that it is required for blocksize of primary fs
2446 * device and journal device to be the same
2449 reiserfs_breada(journal->j_dev_bd, cur_dblock,
2451 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2452 SB_ONDISK_JOURNAL_SIZE(sb));
2454 journal_transaction_is_valid(sb, d_bh,
2455 &oldest_invalid_trans_id,
2458 desc = (struct reiserfs_journal_desc *)d_bh->b_data;
2459 if (oldest_start == 0) { /* init all oldest_ values */
2460 oldest_trans_id = get_desc_trans_id(desc);
2461 oldest_start = d_bh->b_blocknr;
2462 newest_mount_id = get_desc_mount_id(desc);
2463 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2464 "journal-1179: Setting "
2465 "oldest_start to offset %llu, trans_id %lu",
2467 SB_ONDISK_JOURNAL_1st_BLOCK
2468 (sb), oldest_trans_id);
2469 } else if (oldest_trans_id > get_desc_trans_id(desc)) {
2470 /* one we just read was older */
2471 oldest_trans_id = get_desc_trans_id(desc);
2472 oldest_start = d_bh->b_blocknr;
2473 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2474 "journal-1180: Resetting "
2475 "oldest_start to offset %lu, trans_id %lu",
2477 SB_ONDISK_JOURNAL_1st_BLOCK
2478 (sb), oldest_trans_id);
2480 if (newest_mount_id < get_desc_mount_id(desc)) {
2481 newest_mount_id = get_desc_mount_id(desc);
2482 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2483 "journal-1299: Setting "
2484 "newest_mount_id to %d",
2485 get_desc_mount_id(desc));
2487 cur_dblock += get_desc_trans_len(desc) + 2;
2495 cur_dblock = oldest_start;
2496 if (oldest_trans_id) {
2497 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2498 "journal-1206: Starting replay "
2499 "from offset %llu, trans_id %lu",
2500 cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2505 while (continue_replay && oldest_trans_id > 0) {
2507 journal_read_transaction(sb, cur_dblock, oldest_start,
2508 oldest_trans_id, newest_mount_id);
2511 } else if (ret != 0) {
2515 SB_ONDISK_JOURNAL_1st_BLOCK(sb) + journal->j_start;
2517 if (cur_dblock == oldest_start)
2521 if (oldest_trans_id == 0) {
2522 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2523 "journal-1225: No valid " "transactions found");
2526 * j_start does not get set correctly if we don't replay any
2527 * transactions. if we had a valid journal_header, set j_start
2528 * to the first unflushed transaction value, copy the trans_id
2531 if (valid_journal_header && replay_count == 0) {
2532 journal->j_start = le32_to_cpu(jh->j_first_unflushed_offset);
2533 journal->j_trans_id =
2534 le32_to_cpu(jh->j_last_flush_trans_id) + 1;
2535 /* check for trans_id overflow */
2536 if (journal->j_trans_id == 0)
2537 journal->j_trans_id = 10;
2538 journal->j_last_flush_trans_id =
2539 le32_to_cpu(jh->j_last_flush_trans_id);
2540 journal->j_mount_id = le32_to_cpu(jh->j_mount_id) + 1;
2542 journal->j_mount_id = newest_mount_id + 1;
2544 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1299: Setting "
2545 "newest_mount_id to %lu", journal->j_mount_id);
2546 journal->j_first_unflushed_offset = journal->j_start;
2547 if (replay_count > 0) {
2549 "replayed %d transactions in %lu seconds\n",
2550 replay_count, get_seconds() - start);
2552 /* needed to satisfy the locking in _update_journal_header_block */
2553 reiserfs_write_lock(sb);
2554 if (!bdev_read_only(sb->s_bdev) &&
2555 _update_journal_header_block(sb, journal->j_start,
2556 journal->j_last_flush_trans_id)) {
2557 reiserfs_write_unlock(sb);
2559 * replay failed, caller must call free_journal_ram and abort
2564 reiserfs_write_unlock(sb);
2568 static struct reiserfs_journal_list *alloc_journal_list(struct super_block *s)
2570 struct reiserfs_journal_list *jl;
2571 jl = kzalloc(sizeof(struct reiserfs_journal_list),
2572 GFP_NOFS | __GFP_NOFAIL);
2573 INIT_LIST_HEAD(&jl->j_list);
2574 INIT_LIST_HEAD(&jl->j_working_list);
2575 INIT_LIST_HEAD(&jl->j_tail_bh_list);
2576 INIT_LIST_HEAD(&jl->j_bh_list);
2577 mutex_init(&jl->j_commit_mutex);
2578 SB_JOURNAL(s)->j_num_lists++;
2579 get_journal_list(jl);
2583 static void journal_list_init(struct super_block *sb)
2585 SB_JOURNAL(sb)->j_current_jl = alloc_journal_list(sb);
2588 static void release_journal_dev(struct super_block *super,
2589 struct reiserfs_journal *journal)
2591 if (journal->j_dev_bd != NULL) {
2592 blkdev_put(journal->j_dev_bd, journal->j_dev_mode);
2593 journal->j_dev_bd = NULL;
2597 static int journal_init_dev(struct super_block *super,
2598 struct reiserfs_journal *journal,
2599 const char *jdev_name)
2603 fmode_t blkdev_mode = FMODE_READ | FMODE_WRITE | FMODE_EXCL;
2604 char b[BDEVNAME_SIZE];
2608 journal->j_dev_bd = NULL;
2609 jdev = SB_ONDISK_JOURNAL_DEVICE(super) ?
2610 new_decode_dev(SB_ONDISK_JOURNAL_DEVICE(super)) : super->s_dev;
2612 if (bdev_read_only(super->s_bdev))
2613 blkdev_mode = FMODE_READ;
2615 /* there is no "jdev" option and journal is on separate device */
2616 if ((!jdev_name || !jdev_name[0])) {
2617 if (jdev == super->s_dev)
2618 blkdev_mode &= ~FMODE_EXCL;
2619 journal->j_dev_bd = blkdev_get_by_dev(jdev, blkdev_mode,
2621 journal->j_dev_mode = blkdev_mode;
2622 if (IS_ERR(journal->j_dev_bd)) {
2623 result = PTR_ERR(journal->j_dev_bd);
2624 journal->j_dev_bd = NULL;
2625 reiserfs_warning(super, "sh-458",
2626 "cannot init journal device '%s': %i",
2627 __bdevname(jdev, b), result);
2629 } else if (jdev != super->s_dev)
2630 set_blocksize(journal->j_dev_bd, super->s_blocksize);
2635 journal->j_dev_mode = blkdev_mode;
2636 journal->j_dev_bd = blkdev_get_by_path(jdev_name, blkdev_mode, journal);
2637 if (IS_ERR(journal->j_dev_bd)) {
2638 result = PTR_ERR(journal->j_dev_bd);
2639 journal->j_dev_bd = NULL;
2640 reiserfs_warning(super,
2641 "journal_init_dev: Cannot open '%s': %i",
2646 set_blocksize(journal->j_dev_bd, super->s_blocksize);
2647 reiserfs_info(super,
2648 "journal_init_dev: journal device: %s\n",
2649 bdevname(journal->j_dev_bd, b));
2654 * When creating/tuning a file system user can assign some
2655 * journal params within boundaries which depend on the ratio
2656 * blocksize/standard_blocksize.
2658 * For blocks >= standard_blocksize transaction size should
2659 * be not less then JOURNAL_TRANS_MIN_DEFAULT, and not more
2660 * then JOURNAL_TRANS_MAX_DEFAULT.
2662 * For blocks < standard_blocksize these boundaries should be
2663 * decreased proportionally.
2665 #define REISERFS_STANDARD_BLKSIZE (4096)
2667 static int check_advise_trans_params(struct super_block *sb,
2668 struct reiserfs_journal *journal)
2670 if (journal->j_trans_max) {
2671 /* Non-default journal params. Do sanity check for them. */
2673 if (sb->s_blocksize < REISERFS_STANDARD_BLKSIZE)
2674 ratio = REISERFS_STANDARD_BLKSIZE / sb->s_blocksize;
2676 if (journal->j_trans_max > JOURNAL_TRANS_MAX_DEFAULT / ratio ||
2677 journal->j_trans_max < JOURNAL_TRANS_MIN_DEFAULT / ratio ||
2678 SB_ONDISK_JOURNAL_SIZE(sb) / journal->j_trans_max <
2679 JOURNAL_MIN_RATIO) {
2680 reiserfs_warning(sb, "sh-462",
2681 "bad transaction max size (%u). "
2682 "FSCK?", journal->j_trans_max);
2685 if (journal->j_max_batch != (journal->j_trans_max) *
2686 JOURNAL_MAX_BATCH_DEFAULT/JOURNAL_TRANS_MAX_DEFAULT) {
2687 reiserfs_warning(sb, "sh-463",
2688 "bad transaction max batch (%u). "
2689 "FSCK?", journal->j_max_batch);
2694 * Default journal params.
2695 * The file system was created by old version
2696 * of mkreiserfs, so some fields contain zeros,
2697 * and we need to advise proper values for them
2699 if (sb->s_blocksize != REISERFS_STANDARD_BLKSIZE) {
2700 reiserfs_warning(sb, "sh-464", "bad blocksize (%u)",
2704 journal->j_trans_max = JOURNAL_TRANS_MAX_DEFAULT;
2705 journal->j_max_batch = JOURNAL_MAX_BATCH_DEFAULT;
2706 journal->j_max_commit_age = JOURNAL_MAX_COMMIT_AGE;
2711 /* must be called once on fs mount. calls journal_read for you */
2712 int journal_init(struct super_block *sb, const char *j_dev_name,
2713 int old_format, unsigned int commit_max_age)
2715 int num_cnodes = SB_ONDISK_JOURNAL_SIZE(sb) * 2;
2716 struct buffer_head *bhjh;
2717 struct reiserfs_super_block *rs;
2718 struct reiserfs_journal_header *jh;
2719 struct reiserfs_journal *journal;
2720 struct reiserfs_journal_list *jl;
2721 char b[BDEVNAME_SIZE];
2724 journal = SB_JOURNAL(sb) = vzalloc(sizeof(struct reiserfs_journal));
2726 reiserfs_warning(sb, "journal-1256",
2727 "unable to get memory for journal structure");
2730 INIT_LIST_HEAD(&journal->j_bitmap_nodes);
2731 INIT_LIST_HEAD(&journal->j_prealloc_list);
2732 INIT_LIST_HEAD(&journal->j_working_list);
2733 INIT_LIST_HEAD(&journal->j_journal_list);
2734 journal->j_persistent_trans = 0;
2735 if (reiserfs_allocate_list_bitmaps(sb, journal->j_list_bitmap,
2736 reiserfs_bmap_count(sb)))
2737 goto free_and_return;
2739 allocate_bitmap_nodes(sb);
2741 /* reserved for journal area support */
2742 SB_JOURNAL_1st_RESERVED_BLOCK(sb) = (old_format ?
2743 REISERFS_OLD_DISK_OFFSET_IN_BYTES
2745 reiserfs_bmap_count(sb) +
2747 REISERFS_DISK_OFFSET_IN_BYTES /
2748 sb->s_blocksize + 2);
2751 * Sanity check to see is the standard journal fitting
2752 * within first bitmap (actual for small blocksizes)
2754 if (!SB_ONDISK_JOURNAL_DEVICE(sb) &&
2755 (SB_JOURNAL_1st_RESERVED_BLOCK(sb) +
2756 SB_ONDISK_JOURNAL_SIZE(sb) > sb->s_blocksize * 8)) {
2757 reiserfs_warning(sb, "journal-1393",
2758 "journal does not fit for area addressed "
2759 "by first of bitmap blocks. It starts at "
2760 "%u and its size is %u. Block size %ld",
2761 SB_JOURNAL_1st_RESERVED_BLOCK(sb),
2762 SB_ONDISK_JOURNAL_SIZE(sb),
2764 goto free_and_return;
2767 if (journal_init_dev(sb, journal, j_dev_name) != 0) {
2768 reiserfs_warning(sb, "sh-462",
2769 "unable to initialize jornal device");
2770 goto free_and_return;
2773 rs = SB_DISK_SUPER_BLOCK(sb);
2775 /* read journal header */
2776 bhjh = journal_bread(sb,
2777 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2778 SB_ONDISK_JOURNAL_SIZE(sb));
2780 reiserfs_warning(sb, "sh-459",
2781 "unable to read journal header");
2782 goto free_and_return;
2784 jh = (struct reiserfs_journal_header *)(bhjh->b_data);
2786 /* make sure that journal matches to the super block */
2787 if (is_reiserfs_jr(rs)
2788 && (le32_to_cpu(jh->jh_journal.jp_journal_magic) !=
2789 sb_jp_journal_magic(rs))) {
2790 reiserfs_warning(sb, "sh-460",
2791 "journal header magic %x (device %s) does "
2792 "not match to magic found in super block %x",
2793 jh->jh_journal.jp_journal_magic,
2794 bdevname(journal->j_dev_bd, b),
2795 sb_jp_journal_magic(rs));
2797 goto free_and_return;
2800 journal->j_trans_max = le32_to_cpu(jh->jh_journal.jp_journal_trans_max);
2801 journal->j_max_batch = le32_to_cpu(jh->jh_journal.jp_journal_max_batch);
2802 journal->j_max_commit_age =
2803 le32_to_cpu(jh->jh_journal.jp_journal_max_commit_age);
2804 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
2806 if (check_advise_trans_params(sb, journal) != 0)
2807 goto free_and_return;
2808 journal->j_default_max_commit_age = journal->j_max_commit_age;
2810 if (commit_max_age != 0) {
2811 journal->j_max_commit_age = commit_max_age;
2812 journal->j_max_trans_age = commit_max_age;
2815 reiserfs_info(sb, "journal params: device %s, size %u, "
2816 "journal first block %u, max trans len %u, max batch %u, "
2817 "max commit age %u, max trans age %u\n",
2818 bdevname(journal->j_dev_bd, b),
2819 SB_ONDISK_JOURNAL_SIZE(sb),
2820 SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2821 journal->j_trans_max,
2822 journal->j_max_batch,
2823 journal->j_max_commit_age, journal->j_max_trans_age);
2827 journal->j_list_bitmap_index = 0;
2828 journal_list_init(sb);
2830 memset(journal->j_list_hash_table, 0,
2831 JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *));
2833 INIT_LIST_HEAD(&journal->j_dirty_buffers);
2834 spin_lock_init(&journal->j_dirty_buffers_lock);
2836 journal->j_start = 0;
2838 journal->j_len_alloc = 0;
2839 atomic_set(&(journal->j_wcount), 0);
2840 atomic_set(&(journal->j_async_throttle), 0);
2841 journal->j_bcount = 0;
2842 journal->j_trans_start_time = 0;
2843 journal->j_last = NULL;
2844 journal->j_first = NULL;
2845 init_waitqueue_head(&(journal->j_join_wait));
2846 mutex_init(&journal->j_mutex);
2847 mutex_init(&journal->j_flush_mutex);
2849 journal->j_trans_id = 10;
2850 journal->j_mount_id = 10;
2851 journal->j_state = 0;
2852 atomic_set(&(journal->j_jlock), 0);
2853 journal->j_cnode_free_list = allocate_cnodes(num_cnodes);
2854 journal->j_cnode_free_orig = journal->j_cnode_free_list;
2855 journal->j_cnode_free = journal->j_cnode_free_list ? num_cnodes : 0;
2856 journal->j_cnode_used = 0;
2857 journal->j_must_wait = 0;
2859 if (journal->j_cnode_free == 0) {
2860 reiserfs_warning(sb, "journal-2004", "Journal cnode memory "
2861 "allocation failed (%ld bytes). Journal is "
2862 "too large for available memory. Usually "
2863 "this is due to a journal that is too large.",
2864 sizeof (struct reiserfs_journal_cnode) * num_cnodes);
2865 goto free_and_return;
2868 init_journal_hash(sb);
2869 jl = journal->j_current_jl;
2872 * get_list_bitmap() may call flush_commit_list() which
2873 * requires the lock. Calling flush_commit_list() shouldn't happen
2874 * this early but I like to be paranoid.
2876 reiserfs_write_lock(sb);
2877 jl->j_list_bitmap = get_list_bitmap(sb, jl);
2878 reiserfs_write_unlock(sb);
2879 if (!jl->j_list_bitmap) {
2880 reiserfs_warning(sb, "journal-2005",
2881 "get_list_bitmap failed for journal list 0");
2882 goto free_and_return;
2885 ret = journal_read(sb);
2887 reiserfs_warning(sb, "reiserfs-2006",
2888 "Replay Failure, unable to mount");
2889 goto free_and_return;
2892 INIT_DELAYED_WORK(&journal->j_work, flush_async_commits);
2893 journal->j_work_sb = sb;
2896 free_journal_ram(sb);
2901 * test for a polite end of the current transaction. Used by file_write,
2902 * and should be used by delete to make sure they don't write more than
2903 * can fit inside a single transaction
2905 int journal_transaction_should_end(struct reiserfs_transaction_handle *th,
2908 struct reiserfs_journal *journal = SB_JOURNAL(th->t_super);
2909 time_t now = get_seconds();
2910 /* cannot restart while nested */
2911 BUG_ON(!th->t_trans_id);
2912 if (th->t_refcount > 1)
2914 if (journal->j_must_wait > 0 ||
2915 (journal->j_len_alloc + new_alloc) >= journal->j_max_batch ||
2916 atomic_read(&(journal->j_jlock)) ||
2917 (now - journal->j_trans_start_time) > journal->j_max_trans_age ||
2918 journal->j_cnode_free < (journal->j_trans_max * 3)) {
2922 journal->j_len_alloc += new_alloc;
2923 th->t_blocks_allocated += new_alloc ;
2927 /* this must be called inside a transaction */
2928 void reiserfs_block_writes(struct reiserfs_transaction_handle *th)
2930 struct reiserfs_journal *journal = SB_JOURNAL(th->t_super);
2931 BUG_ON(!th->t_trans_id);
2932 journal->j_must_wait = 1;
2933 set_bit(J_WRITERS_BLOCKED, &journal->j_state);
2937 /* this must be called without a transaction started */
2938 void reiserfs_allow_writes(struct super_block *s)
2940 struct reiserfs_journal *journal = SB_JOURNAL(s);
2941 clear_bit(J_WRITERS_BLOCKED, &journal->j_state);
2942 wake_up(&journal->j_join_wait);
2945 /* this must be called without a transaction started */
2946 void reiserfs_wait_on_write_block(struct super_block *s)
2948 struct reiserfs_journal *journal = SB_JOURNAL(s);
2949 wait_event(journal->j_join_wait,
2950 !test_bit(J_WRITERS_BLOCKED, &journal->j_state));
2953 static void queue_log_writer(struct super_block *s)
2956 struct reiserfs_journal *journal = SB_JOURNAL(s);
2957 set_bit(J_WRITERS_QUEUED, &journal->j_state);
2960 * we don't want to use wait_event here because
2961 * we only want to wait once.
2963 init_waitqueue_entry(&wait, current);
2964 add_wait_queue(&journal->j_join_wait, &wait);
2965 set_current_state(TASK_UNINTERRUPTIBLE);
2966 if (test_bit(J_WRITERS_QUEUED, &journal->j_state)) {
2967 int depth = reiserfs_write_unlock_nested(s);
2969 reiserfs_write_lock_nested(s, depth);
2971 __set_current_state(TASK_RUNNING);
2972 remove_wait_queue(&journal->j_join_wait, &wait);
2975 static void wake_queued_writers(struct super_block *s)
2977 struct reiserfs_journal *journal = SB_JOURNAL(s);
2978 if (test_and_clear_bit(J_WRITERS_QUEUED, &journal->j_state))
2979 wake_up(&journal->j_join_wait);
2982 static void let_transaction_grow(struct super_block *sb, unsigned int trans_id)
2984 struct reiserfs_journal *journal = SB_JOURNAL(sb);
2985 unsigned long bcount = journal->j_bcount;
2989 depth = reiserfs_write_unlock_nested(sb);
2990 schedule_timeout_uninterruptible(1);
2991 reiserfs_write_lock_nested(sb, depth);
2993 journal->j_current_jl->j_state |= LIST_COMMIT_PENDING;
2994 while ((atomic_read(&journal->j_wcount) > 0 ||
2995 atomic_read(&journal->j_jlock)) &&
2996 journal->j_trans_id == trans_id) {
2997 queue_log_writer(sb);
2999 if (journal->j_trans_id != trans_id)
3001 if (bcount == journal->j_bcount)
3003 bcount = journal->j_bcount;
3008 * join == true if you must join an existing transaction.
3009 * join == false if you can deal with waiting for others to finish
3011 * this will block until the transaction is joinable. send the number of
3012 * blocks you expect to use in nblocks.
3014 static int do_journal_begin_r(struct reiserfs_transaction_handle *th,
3015 struct super_block *sb, unsigned long nblocks,
3018 time_t now = get_seconds();
3019 unsigned int old_trans_id;
3020 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3021 struct reiserfs_transaction_handle myth;
3022 int sched_count = 0;
3026 reiserfs_check_lock_depth(sb, "journal_begin");
3027 BUG_ON(nblocks > journal->j_trans_max);
3029 PROC_INFO_INC(sb, journal.journal_being);
3030 /* set here for journal_join */
3036 if (join != JBEGIN_ABORT && reiserfs_is_journal_aborted(journal)) {
3038 retval = journal->j_errno;
3041 journal->j_bcount++;
3043 if (test_bit(J_WRITERS_BLOCKED, &journal->j_state)) {
3045 depth = reiserfs_write_unlock_nested(sb);
3046 reiserfs_wait_on_write_block(sb);
3047 reiserfs_write_lock_nested(sb, depth);
3048 PROC_INFO_INC(sb, journal.journal_relock_writers);
3051 now = get_seconds();
3054 * if there is no room in the journal OR
3055 * if this transaction is too old, and we weren't called joinable,
3056 * wait for it to finish before beginning we don't sleep if there
3057 * aren't other writers
3060 if ((!join && journal->j_must_wait > 0) ||
3062 && (journal->j_len_alloc + nblocks + 2) >= journal->j_max_batch)
3063 || (!join && atomic_read(&journal->j_wcount) > 0
3064 && journal->j_trans_start_time > 0
3065 && (now - journal->j_trans_start_time) >
3066 journal->j_max_trans_age) || (!join
3067 && atomic_read(&journal->j_jlock))
3068 || (!join && journal->j_cnode_free < (journal->j_trans_max * 3))) {
3070 old_trans_id = journal->j_trans_id;
3071 /* allow others to finish this transaction */
3074 if (!join && (journal->j_len_alloc + nblocks + 2) >=
3075 journal->j_max_batch &&
3076 ((journal->j_len + nblocks + 2) * 100) <
3077 (journal->j_len_alloc * 75)) {
3078 if (atomic_read(&journal->j_wcount) > 10) {
3080 queue_log_writer(sb);
3085 * don't mess with joining the transaction if all we
3086 * have to do is wait for someone else to do a commit
3088 if (atomic_read(&journal->j_jlock)) {
3089 while (journal->j_trans_id == old_trans_id &&
3090 atomic_read(&journal->j_jlock)) {
3091 queue_log_writer(sb);
3095 retval = journal_join(&myth, sb);
3099 /* someone might have ended the transaction while we joined */
3100 if (old_trans_id != journal->j_trans_id) {
3101 retval = do_journal_end(&myth, 0);
3103 retval = do_journal_end(&myth, COMMIT_NOW);
3109 PROC_INFO_INC(sb, journal.journal_relock_wcount);
3112 /* we are the first writer, set trans_id */
3113 if (journal->j_trans_start_time == 0) {
3114 journal->j_trans_start_time = get_seconds();
3116 atomic_inc(&(journal->j_wcount));
3117 journal->j_len_alloc += nblocks;
3118 th->t_blocks_logged = 0;
3119 th->t_blocks_allocated = nblocks;
3120 th->t_trans_id = journal->j_trans_id;
3122 INIT_LIST_HEAD(&th->t_list);
3126 memset(th, 0, sizeof(*th));
3128 * Re-set th->t_super, so we can properly keep track of how many
3129 * persistent transactions there are. We need to do this so if this
3130 * call is part of a failed restart_transaction, we can free it later
3136 struct reiserfs_transaction_handle *reiserfs_persistent_transaction(struct
3142 struct reiserfs_transaction_handle *th;
3145 * if we're nesting into an existing transaction. It will be
3146 * persistent on its own
3148 if (reiserfs_transaction_running(s)) {
3149 th = current->journal_info;
3151 BUG_ON(th->t_refcount < 2);
3155 th = kmalloc(sizeof(struct reiserfs_transaction_handle), GFP_NOFS);
3158 ret = journal_begin(th, s, nblocks);
3164 SB_JOURNAL(s)->j_persistent_trans++;
3168 int reiserfs_end_persistent_transaction(struct reiserfs_transaction_handle *th)
3170 struct super_block *s = th->t_super;
3173 ret = journal_end(th);
3176 if (th->t_refcount == 0) {
3177 SB_JOURNAL(s)->j_persistent_trans--;
3183 static int journal_join(struct reiserfs_transaction_handle *th,
3184 struct super_block *sb)
3186 struct reiserfs_transaction_handle *cur_th = current->journal_info;
3189 * this keeps do_journal_end from NULLing out the
3190 * current->journal_info pointer
3192 th->t_handle_save = cur_th;
3193 BUG_ON(cur_th && cur_th->t_refcount > 1);
3194 return do_journal_begin_r(th, sb, 1, JBEGIN_JOIN);
3197 int journal_join_abort(struct reiserfs_transaction_handle *th,
3198 struct super_block *sb)
3200 struct reiserfs_transaction_handle *cur_th = current->journal_info;
3203 * this keeps do_journal_end from NULLing out the
3204 * current->journal_info pointer
3206 th->t_handle_save = cur_th;
3207 BUG_ON(cur_th && cur_th->t_refcount > 1);
3208 return do_journal_begin_r(th, sb, 1, JBEGIN_ABORT);
3211 int journal_begin(struct reiserfs_transaction_handle *th,
3212 struct super_block *sb, unsigned long nblocks)
3214 struct reiserfs_transaction_handle *cur_th = current->journal_info;
3217 th->t_handle_save = NULL;
3219 /* we are nesting into the current transaction */
3220 if (cur_th->t_super == sb) {
3221 BUG_ON(!cur_th->t_refcount);
3222 cur_th->t_refcount++;
3223 memcpy(th, cur_th, sizeof(*th));
3224 if (th->t_refcount <= 1)
3225 reiserfs_warning(sb, "reiserfs-2005",
3226 "BAD: refcount <= 1, but "
3227 "journal_info != 0");
3231 * we've ended up with a handle from a different
3232 * filesystem. save it and restore on journal_end.
3233 * This should never really happen...
3235 reiserfs_warning(sb, "clm-2100",
3236 "nesting info a different FS");
3237 th->t_handle_save = current->journal_info;
3238 current->journal_info = th;
3241 current->journal_info = th;
3243 ret = do_journal_begin_r(th, sb, nblocks, JBEGIN_REG);
3244 BUG_ON(current->journal_info != th);
3247 * I guess this boils down to being the reciprocal of clm-2100 above.
3248 * If do_journal_begin_r fails, we need to put it back, since
3249 * journal_end won't be called to do it. */
3251 current->journal_info = th->t_handle_save;
3253 BUG_ON(!th->t_refcount);
3259 * puts bh into the current transaction. If it was already there, reorders
3260 * removes the old pointers from the hash, and puts new ones in (to make
3261 * sure replay happen in the right order).
3263 * if it was dirty, cleans and files onto the clean list. I can't let it
3264 * be dirty again until the transaction is committed.
3266 * if j_len, is bigger than j_len_alloc, it pushes j_len_alloc to 10 + j_len.
3268 int journal_mark_dirty(struct reiserfs_transaction_handle *th,
3269 struct buffer_head *bh)
3271 struct super_block *sb = th->t_super;
3272 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3273 struct reiserfs_journal_cnode *cn = NULL;
3274 int count_already_incd = 0;
3276 BUG_ON(!th->t_trans_id);
3278 PROC_INFO_INC(sb, journal.mark_dirty);
3279 if (th->t_trans_id != journal->j_trans_id) {
3280 reiserfs_panic(th->t_super, "journal-1577",
3281 "handle trans id %ld != current trans id %ld",
3282 th->t_trans_id, journal->j_trans_id);
3285 prepared = test_clear_buffer_journal_prepared(bh);
3286 clear_buffer_journal_restore_dirty(bh);
3287 /* already in this transaction, we are done */
3288 if (buffer_journaled(bh)) {
3289 PROC_INFO_INC(sb, journal.mark_dirty_already);
3294 * this must be turned into a panic instead of a warning. We can't
3295 * allow a dirty or journal_dirty or locked buffer to be logged, as
3296 * some changes could get to disk too early. NOT GOOD.
3298 if (!prepared || buffer_dirty(bh)) {
3299 reiserfs_warning(sb, "journal-1777",
3300 "buffer %llu bad state "
3301 "%cPREPARED %cLOCKED %cDIRTY %cJDIRTY_WAIT",
3302 (unsigned long long)bh->b_blocknr,
3303 prepared ? ' ' : '!',
3304 buffer_locked(bh) ? ' ' : '!',
3305 buffer_dirty(bh) ? ' ' : '!',
3306 buffer_journal_dirty(bh) ? ' ' : '!');
3309 if (atomic_read(&(journal->j_wcount)) <= 0) {
3310 reiserfs_warning(sb, "journal-1409",
3311 "returning because j_wcount was %d",
3312 atomic_read(&(journal->j_wcount)));
3316 * this error means I've screwed up, and we've overflowed
3317 * the transaction. Nothing can be done here, except make the
3318 * FS readonly or panic.
3320 if (journal->j_len >= journal->j_trans_max) {
3321 reiserfs_panic(th->t_super, "journal-1413",
3322 "j_len (%lu) is too big",
3326 if (buffer_journal_dirty(bh)) {
3327 count_already_incd = 1;
3328 PROC_INFO_INC(sb, journal.mark_dirty_notjournal);
3329 clear_buffer_journal_dirty(bh);
3332 if (journal->j_len > journal->j_len_alloc) {
3333 journal->j_len_alloc = journal->j_len + JOURNAL_PER_BALANCE_CNT;
3336 set_buffer_journaled(bh);
3338 /* now put this guy on the end */
3342 reiserfs_panic(sb, "journal-4", "get_cnode failed!");
3345 if (th->t_blocks_logged == th->t_blocks_allocated) {
3346 th->t_blocks_allocated += JOURNAL_PER_BALANCE_CNT;
3347 journal->j_len_alloc += JOURNAL_PER_BALANCE_CNT;
3349 th->t_blocks_logged++;
3353 cn->blocknr = bh->b_blocknr;
3356 insert_journal_hash(journal->j_hash_table, cn);
3357 if (!count_already_incd) {
3362 cn->prev = journal->j_last;
3364 if (journal->j_last) {
3365 journal->j_last->next = cn;
3366 journal->j_last = cn;
3368 journal->j_first = cn;
3369 journal->j_last = cn;
3371 reiserfs_schedule_old_flush(sb);
3375 int journal_end(struct reiserfs_transaction_handle *th)
3377 struct super_block *sb = th->t_super;
3378 if (!current->journal_info && th->t_refcount > 1)
3379 reiserfs_warning(sb, "REISER-NESTING",
3380 "th NULL, refcount %d", th->t_refcount);
3382 if (!th->t_trans_id) {
3388 if (th->t_refcount > 0) {
3389 struct reiserfs_transaction_handle *cur_th =
3390 current->journal_info;
3393 * we aren't allowed to close a nested transaction on a
3394 * different filesystem from the one in the task struct
3396 BUG_ON(cur_th->t_super != th->t_super);
3399 memcpy(current->journal_info, th, sizeof(*th));
3404 return do_journal_end(th, 0);
3409 * removes from the current transaction, relsing and descrementing any counters.
3410 * also files the removed buffer directly onto the clean list
3412 * called by journal_mark_freed when a block has been deleted
3414 * returns 1 if it cleaned and relsed the buffer. 0 otherwise
3416 static int remove_from_transaction(struct super_block *sb,
3417 b_blocknr_t blocknr, int already_cleaned)
3419 struct buffer_head *bh;
3420 struct reiserfs_journal_cnode *cn;
3421 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3424 cn = get_journal_hash_dev(sb, journal->j_hash_table, blocknr);
3425 if (!cn || !cn->bh) {
3430 cn->prev->next = cn->next;
3433 cn->next->prev = cn->prev;
3435 if (cn == journal->j_first) {
3436 journal->j_first = cn->next;
3438 if (cn == journal->j_last) {
3439 journal->j_last = cn->prev;
3442 remove_journal_hash(sb, journal->j_hash_table, NULL,
3444 clear_buffer_journaled(bh); /* don't log this one */
3446 if (!already_cleaned) {
3447 clear_buffer_journal_dirty(bh);
3448 clear_buffer_dirty(bh);
3449 clear_buffer_journal_test(bh);
3451 if (atomic_read(&(bh->b_count)) < 0) {
3452 reiserfs_warning(sb, "journal-1752",
3458 journal->j_len_alloc--;
3464 * for any cnode in a journal list, it can only be dirtied of all the
3465 * transactions that include it are committed to disk.
3466 * this checks through each transaction, and returns 1 if you are allowed
3467 * to dirty, and 0 if you aren't
3469 * it is called by dirty_journal_list, which is called after
3470 * flush_commit_list has gotten all the log blocks for a given
3471 * transaction on disk
3474 static int can_dirty(struct reiserfs_journal_cnode *cn)
3476 struct super_block *sb = cn->sb;
3477 b_blocknr_t blocknr = cn->blocknr;
3478 struct reiserfs_journal_cnode *cur = cn->hprev;
3482 * first test hprev. These are all newer than cn, so any node here
3483 * with the same block number and dev means this node can't be sent
3484 * to disk right now.
3486 while (cur && can_dirty) {
3487 if (cur->jlist && cur->bh && cur->blocknr && cur->sb == sb &&
3488 cur->blocknr == blocknr) {
3494 * then test hnext. These are all older than cn. As long as they
3495 * are committed to the log, it is safe to write cn to disk
3498 while (cur && can_dirty) {
3499 if (cur->jlist && cur->jlist->j_len > 0 &&
3500 atomic_read(&(cur->jlist->j_commit_left)) > 0 && cur->bh &&
3501 cur->blocknr && cur->sb == sb && cur->blocknr == blocknr) {
3510 * syncs the commit blocks, but does not force the real buffers to disk
3511 * will wait until the current transaction is done/committed before returning
3513 int journal_end_sync(struct reiserfs_transaction_handle *th)
3515 struct super_block *sb = th->t_super;
3516 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3518 BUG_ON(!th->t_trans_id);
3519 /* you can sync while nested, very, very bad */
3520 BUG_ON(th->t_refcount > 1);
3521 if (journal->j_len == 0) {
3522 reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
3524 journal_mark_dirty(th, SB_BUFFER_WITH_SB(sb));
3526 return do_journal_end(th, COMMIT_NOW | WAIT);
3529 /* writeback the pending async commits to disk */
3530 static void flush_async_commits(struct work_struct *work)
3532 struct reiserfs_journal *journal =
3533 container_of(work, struct reiserfs_journal, j_work.work);
3534 struct super_block *sb = journal->j_work_sb;
3535 struct reiserfs_journal_list *jl;
3536 struct list_head *entry;
3538 reiserfs_write_lock(sb);
3539 if (!list_empty(&journal->j_journal_list)) {
3540 /* last entry is the youngest, commit it and you get everything */
3541 entry = journal->j_journal_list.prev;
3542 jl = JOURNAL_LIST_ENTRY(entry);
3543 flush_commit_list(sb, jl, 1);
3545 reiserfs_write_unlock(sb);
3549 * flushes any old transactions to disk
3550 * ends the current transaction if it is too old
3552 void reiserfs_flush_old_commits(struct super_block *sb)
3555 struct reiserfs_transaction_handle th;
3556 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3558 now = get_seconds();
3560 * safety check so we don't flush while we are replaying the log during
3563 if (list_empty(&journal->j_journal_list))
3567 * check the current transaction. If there are no writers, and it is
3568 * too old, finish it, and force the commit blocks to disk
3570 if (atomic_read(&journal->j_wcount) <= 0 &&
3571 journal->j_trans_start_time > 0 &&
3572 journal->j_len > 0 &&
3573 (now - journal->j_trans_start_time) > journal->j_max_trans_age) {
3574 if (!journal_join(&th, sb)) {
3575 reiserfs_prepare_for_journal(sb,
3576 SB_BUFFER_WITH_SB(sb),
3578 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(sb));
3581 * we're only being called from kreiserfsd, it makes
3582 * no sense to do an async commit so that kreiserfsd
3585 do_journal_end(&th, COMMIT_NOW | WAIT);
3591 * returns 0 if do_journal_end should return right away, returns 1 if
3592 * do_journal_end should finish the commit
3594 * if the current transaction is too old, but still has writers, this will
3595 * wait on j_join_wait until all the writers are done. By the time it
3596 * wakes up, the transaction it was called has already ended, so it just
3597 * flushes the commit list and returns 0.
3599 * Won't batch when flush or commit_now is set. Also won't batch when
3600 * others are waiting on j_join_wait.
3602 * Note, we can't allow the journal_end to proceed while there are still
3603 * writers in the log.
3605 static int check_journal_end(struct reiserfs_transaction_handle *th, int flags)
3609 int flush = flags & FLUSH_ALL;
3610 int commit_now = flags & COMMIT_NOW;
3611 int wait_on_commit = flags & WAIT;
3612 struct reiserfs_journal_list *jl;
3613 struct super_block *sb = th->t_super;
3614 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3616 BUG_ON(!th->t_trans_id);
3618 if (th->t_trans_id != journal->j_trans_id) {
3619 reiserfs_panic(th->t_super, "journal-1577",
3620 "handle trans id %ld != current trans id %ld",
3621 th->t_trans_id, journal->j_trans_id);
3624 journal->j_len_alloc -= (th->t_blocks_allocated - th->t_blocks_logged);
3625 /* <= 0 is allowed. unmounting might not call begin */
3626 if (atomic_read(&(journal->j_wcount)) > 0)
3627 atomic_dec(&(journal->j_wcount));
3630 * BUG, deal with case where j_len is 0, but people previously
3631 * freed blocks need to be released will be dealt with by next
3632 * transaction that actually writes something, but should be taken
3633 * care of in this trans
3635 BUG_ON(journal->j_len == 0);
3638 * if wcount > 0, and we are called to with flush or commit_now,
3639 * we wait on j_join_wait. We will wake up when the last writer has
3640 * finished the transaction, and started it on its way to the disk.
3641 * Then, we flush the commit or journal list, and just return 0
3642 * because the rest of journal end was already done for this
3645 if (atomic_read(&(journal->j_wcount)) > 0) {
3646 if (flush || commit_now) {
3649 jl = journal->j_current_jl;
3650 trans_id = jl->j_trans_id;
3652 jl->j_state |= LIST_COMMIT_PENDING;
3653 atomic_set(&(journal->j_jlock), 1);
3655 journal->j_next_full_flush = 1;
3660 * sleep while the current transaction is
3663 while (journal->j_trans_id == trans_id) {
3664 if (atomic_read(&journal->j_jlock)) {
3665 queue_log_writer(sb);
3668 if (journal->j_trans_id == trans_id) {
3669 atomic_set(&(journal->j_jlock),
3675 BUG_ON(journal->j_trans_id == trans_id);
3678 && journal_list_still_alive(sb, trans_id)
3679 && wait_on_commit) {
3680 flush_commit_list(sb, jl, 1);
3688 /* deal with old transactions where we are the last writers */
3689 now = get_seconds();
3690 if ((now - journal->j_trans_start_time) > journal->j_max_trans_age) {
3692 journal->j_next_async_flush = 1;
3694 /* don't batch when someone is waiting on j_join_wait */
3695 /* don't batch when syncing the commit or flushing the whole trans */
3696 if (!(journal->j_must_wait > 0) && !(atomic_read(&(journal->j_jlock)))
3697 && !flush && !commit_now && (journal->j_len < journal->j_max_batch)
3698 && journal->j_len_alloc < journal->j_max_batch
3699 && journal->j_cnode_free > (journal->j_trans_max * 3)) {
3700 journal->j_bcount++;
3705 if (journal->j_start > SB_ONDISK_JOURNAL_SIZE(sb)) {
3706 reiserfs_panic(sb, "journal-003",
3707 "j_start (%ld) is too high",
3714 * Does all the work that makes deleting blocks safe.
3715 * when deleting a block mark BH_JNew, just remove it from the current
3716 * transaction, clean it's buffer_head and move on.
3719 * set a bit for the block in the journal bitmap. That will prevent it from
3720 * being allocated for unformatted nodes before this transaction has finished.
3722 * mark any cnodes for this block as BLOCK_FREED, and clear their bh pointers.
3723 * That will prevent any old transactions with this block from trying to flush
3724 * to the real location. Since we aren't removing the cnode from the
3725 * journal_list_hash, *the block can't be reallocated yet.
3727 * Then remove it from the current transaction, decrementing any counters and
3728 * filing it on the clean list.
3730 int journal_mark_freed(struct reiserfs_transaction_handle *th,
3731 struct super_block *sb, b_blocknr_t blocknr)
3733 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3734 struct reiserfs_journal_cnode *cn = NULL;
3735 struct buffer_head *bh = NULL;
3736 struct reiserfs_list_bitmap *jb = NULL;
3738 BUG_ON(!th->t_trans_id);
3740 cn = get_journal_hash_dev(sb, journal->j_hash_table, blocknr);
3745 /* if it is journal new, we just remove it from this transaction */
3746 if (bh && buffer_journal_new(bh)) {
3747 clear_buffer_journal_new(bh);
3748 clear_prepared_bits(bh);
3749 reiserfs_clean_and_file_buffer(bh);
3750 cleaned = remove_from_transaction(sb, blocknr, cleaned);
3753 * set the bit for this block in the journal bitmap
3754 * for this transaction
3756 jb = journal->j_current_jl->j_list_bitmap;
3758 reiserfs_panic(sb, "journal-1702",
3759 "journal_list_bitmap is NULL");
3761 set_bit_in_list_bitmap(sb, blocknr, jb);
3763 /* Note, the entire while loop is not allowed to schedule. */
3766 clear_prepared_bits(bh);
3767 reiserfs_clean_and_file_buffer(bh);
3769 cleaned = remove_from_transaction(sb, blocknr, cleaned);
3772 * find all older transactions with this block,
3773 * make sure they don't try to write it out
3775 cn = get_journal_hash_dev(sb, journal->j_list_hash_table,
3778 if (sb == cn->sb && blocknr == cn->blocknr) {
3779 set_bit(BLOCK_FREED, &cn->state);
3782 * remove_from_transaction will brelse
3783 * the buffer if it was in the current
3787 clear_buffer_journal_dirty(cn->
3789 clear_buffer_dirty(cn->bh);
3790 clear_buffer_journal_test(cn->
3795 (&(cn->bh->b_count)) < 0) {
3796 reiserfs_warning(sb,
3798 "cn->bh->b_count < 0");
3802 * since we are clearing the bh,
3803 * we MUST dec nonzerolen
3818 release_buffer_page(bh); /* get_hash grabs the buffer */
3822 void reiserfs_update_inode_transaction(struct inode *inode)
3824 struct reiserfs_journal *journal = SB_JOURNAL(inode->i_sb);
3825 REISERFS_I(inode)->i_jl = journal->j_current_jl;
3826 REISERFS_I(inode)->i_trans_id = journal->j_trans_id;
3830 * returns -1 on error, 0 if no commits/barriers were done and 1
3831 * if a transaction was actually committed and the barrier was done
3833 static int __commit_trans_jl(struct inode *inode, unsigned long id,
3834 struct reiserfs_journal_list *jl)
3836 struct reiserfs_transaction_handle th;
3837 struct super_block *sb = inode->i_sb;
3838 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3842 * is it from the current transaction,
3843 * or from an unknown transaction?
3845 if (id == journal->j_trans_id) {
3846 jl = journal->j_current_jl;
3848 * try to let other writers come in and
3849 * grow this transaction
3851 let_transaction_grow(sb, id);
3852 if (journal->j_trans_id != id) {
3853 goto flush_commit_only;
3856 ret = journal_begin(&th, sb, 1);
3860 /* someone might have ended this transaction while we joined */
3861 if (journal->j_trans_id != id) {
3862 reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
3864 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(sb));
3865 ret = journal_end(&th);
3866 goto flush_commit_only;
3869 ret = journal_end_sync(&th);
3875 * this gets tricky, we have to make sure the journal list in
3876 * the inode still exists. We know the list is still around
3877 * if we've got a larger transaction id than the oldest list
3880 if (journal_list_still_alive(inode->i_sb, id)) {
3882 * we only set ret to 1 when we know for sure
3883 * the barrier hasn't been started yet on the commit
3886 if (atomic_read(&jl->j_commit_left) > 1)
3888 flush_commit_list(sb, jl, 1);
3889 if (journal->j_errno)
3890 ret = journal->j_errno;
3893 /* otherwise the list is gone, and long since committed */
3897 int reiserfs_commit_for_inode(struct inode *inode)
3899 unsigned int id = REISERFS_I(inode)->i_trans_id;
3900 struct reiserfs_journal_list *jl = REISERFS_I(inode)->i_jl;
3903 * for the whole inode, assume unset id means it was
3904 * changed in the current transaction. More conservative
3907 reiserfs_update_inode_transaction(inode);
3908 id = REISERFS_I(inode)->i_trans_id;
3909 /* jl will be updated in __commit_trans_jl */
3912 return __commit_trans_jl(inode, id, jl);
3915 void reiserfs_restore_prepared_buffer(struct super_block *sb,
3916 struct buffer_head *bh)
3918 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3919 PROC_INFO_INC(sb, journal.restore_prepared);
3923 if (test_clear_buffer_journal_restore_dirty(bh) &&
3924 buffer_journal_dirty(bh)) {
3925 struct reiserfs_journal_cnode *cn;
3926 reiserfs_write_lock(sb);
3927 cn = get_journal_hash_dev(sb,
3928 journal->j_list_hash_table,
3930 if (cn && can_dirty(cn)) {
3931 set_buffer_journal_test(bh);
3932 mark_buffer_dirty(bh);
3934 reiserfs_write_unlock(sb);
3936 clear_buffer_journal_prepared(bh);
3939 extern struct tree_balance *cur_tb;
3941 * before we can change a metadata block, we have to make sure it won't
3942 * be written to disk while we are altering it. So, we must:
3946 int reiserfs_prepare_for_journal(struct super_block *sb,
3947 struct buffer_head *bh, int wait)
3949 PROC_INFO_INC(sb, journal.prepare);
3951 if (!trylock_buffer(bh)) {
3956 set_buffer_journal_prepared(bh);
3957 if (test_clear_buffer_dirty(bh) && buffer_journal_dirty(bh)) {
3958 clear_buffer_journal_test(bh);
3959 set_buffer_journal_restore_dirty(bh);
3966 * long and ugly. If flush, will not return until all commit
3967 * blocks and all real buffers in the trans are on disk.
3968 * If no_async, won't return until all commit blocks are on disk.
3970 * keep reading, there are comments as you go along
3972 * If the journal is aborted, we just clean up. Things like flushing
3973 * journal lists, etc just won't happen.
3975 static int do_journal_end(struct reiserfs_transaction_handle *th, int flags)
3977 struct super_block *sb = th->t_super;
3978 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3979 struct reiserfs_journal_cnode *cn, *next, *jl_cn;
3980 struct reiserfs_journal_cnode *last_cn = NULL;
3981 struct reiserfs_journal_desc *desc;
3982 struct reiserfs_journal_commit *commit;
3983 struct buffer_head *c_bh; /* commit bh */
3984 struct buffer_head *d_bh; /* desc bh */
3985 int cur_write_start = 0; /* start index of current log write */
3990 struct reiserfs_journal_list *jl, *temp_jl;
3991 struct list_head *entry, *safe;
3992 unsigned long jindex;
3993 unsigned int commit_trans_id;
3997 BUG_ON(th->t_refcount > 1);
3998 BUG_ON(!th->t_trans_id);
3999 BUG_ON(!th->t_super);
4002 * protect flush_older_commits from doing mistakes if the
4003 * transaction ID counter gets overflowed.
4005 if (th->t_trans_id == ~0U)
4006 flags |= FLUSH_ALL | COMMIT_NOW | WAIT;
4007 flush = flags & FLUSH_ALL;
4008 wait_on_commit = flags & WAIT;
4010 current->journal_info = th->t_handle_save;
4011 reiserfs_check_lock_depth(sb, "journal end");
4012 if (journal->j_len == 0) {
4013 reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
4015 journal_mark_dirty(th, SB_BUFFER_WITH_SB(sb));
4019 if (journal->j_next_full_flush) {
4023 if (journal->j_next_async_flush) {
4024 flags |= COMMIT_NOW | WAIT;
4029 * check_journal_end locks the journal, and unlocks if it does
4030 * not return 1 it tells us if we should continue with the
4031 * journal_end, or just return
4033 if (!check_journal_end(th, flags)) {
4034 reiserfs_schedule_old_flush(sb);
4035 wake_queued_writers(sb);
4036 reiserfs_async_progress_wait(sb);
4040 /* check_journal_end might set these, check again */
4041 if (journal->j_next_full_flush) {
4046 * j must wait means we have to flush the log blocks, and the
4047 * real blocks for this transaction
4049 if (journal->j_must_wait > 0) {
4052 #ifdef REISERFS_PREALLOCATE
4054 * quota ops might need to nest, setup the journal_info pointer
4055 * for them and raise the refcount so that it is > 0.
4057 current->journal_info = th;
4060 /* it should not involve new blocks into the transaction */
4061 reiserfs_discard_all_prealloc(th);
4064 current->journal_info = th->t_handle_save;
4067 /* setup description block */
4070 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
4072 set_buffer_uptodate(d_bh);
4073 desc = (struct reiserfs_journal_desc *)(d_bh)->b_data;
4074 memset(d_bh->b_data, 0, d_bh->b_size);
4075 memcpy(get_journal_desc_magic(d_bh), JOURNAL_DESC_MAGIC, 8);
4076 set_desc_trans_id(desc, journal->j_trans_id);
4079 * setup commit block. Don't write (keep it clean too) this one
4080 * until after everyone else is written
4082 c_bh = journal_getblk(sb, SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
4083 ((journal->j_start + journal->j_len +
4084 1) % SB_ONDISK_JOURNAL_SIZE(sb)));
4085 commit = (struct reiserfs_journal_commit *)c_bh->b_data;
4086 memset(c_bh->b_data, 0, c_bh->b_size);
4087 set_commit_trans_id(commit, journal->j_trans_id);
4088 set_buffer_uptodate(c_bh);
4090 /* init this journal list */
4091 jl = journal->j_current_jl;
4094 * we lock the commit before doing anything because
4095 * we want to make sure nobody tries to run flush_commit_list until
4096 * the new transaction is fully setup, and we've already flushed the
4099 reiserfs_mutex_lock_safe(&jl->j_commit_mutex, sb);
4101 /* save the transaction id in case we need to commit it later */
4102 commit_trans_id = jl->j_trans_id;
4104 atomic_set(&jl->j_older_commits_done, 0);
4105 jl->j_trans_id = journal->j_trans_id;
4106 jl->j_timestamp = journal->j_trans_start_time;
4107 jl->j_commit_bh = c_bh;
4108 jl->j_start = journal->j_start;
4109 jl->j_len = journal->j_len;
4110 atomic_set(&jl->j_nonzerolen, journal->j_len);
4111 atomic_set(&jl->j_commit_left, journal->j_len + 2);
4112 jl->j_realblock = NULL;
4115 * The ENTIRE FOR LOOP MUST not cause schedule to occur.
4116 * for each real block, add it to the journal list hash,
4117 * copy into real block index array in the commit or desc block
4119 trans_half = journal_trans_half(sb->s_blocksize);
4120 for (i = 0, cn = journal->j_first; cn; cn = cn->next, i++) {
4121 if (buffer_journaled(cn->bh)) {
4122 jl_cn = get_cnode(sb);
4124 reiserfs_panic(sb, "journal-1676",
4125 "get_cnode returned NULL");
4128 jl->j_realblock = jl_cn;
4130 jl_cn->prev = last_cn;
4133 last_cn->next = jl_cn;
4137 * make sure the block we are trying to log
4138 * is not a block of journal or reserved area
4140 if (is_block_in_log_or_reserved_area
4141 (sb, cn->bh->b_blocknr)) {
4142 reiserfs_panic(sb, "journal-2332",
4143 "Trying to log block %lu, "
4144 "which is a log block",
4147 jl_cn->blocknr = cn->bh->b_blocknr;
4152 insert_journal_hash(journal->j_list_hash_table, jl_cn);
4153 if (i < trans_half) {
4154 desc->j_realblock[i] =
4155 cpu_to_le32(cn->bh->b_blocknr);
4157 commit->j_realblock[i - trans_half] =
4158 cpu_to_le32(cn->bh->b_blocknr);
4164 set_desc_trans_len(desc, journal->j_len);
4165 set_desc_mount_id(desc, journal->j_mount_id);
4166 set_desc_trans_id(desc, journal->j_trans_id);
4167 set_commit_trans_len(commit, journal->j_len);
4170 * special check in case all buffers in the journal
4171 * were marked for not logging
4173 BUG_ON(journal->j_len == 0);
4176 * we're about to dirty all the log blocks, mark the description block
4177 * dirty now too. Don't mark the commit block dirty until all the
4178 * others are on disk
4180 mark_buffer_dirty(d_bh);
4183 * first data block is j_start + 1, so add one to
4184 * cur_write_start wherever you use it
4186 cur_write_start = journal->j_start;
4187 cn = journal->j_first;
4188 jindex = 1; /* start at one so we don't get the desc again */
4190 clear_buffer_journal_new(cn->bh);
4191 /* copy all the real blocks into log area. dirty log blocks */
4192 if (buffer_journaled(cn->bh)) {
4193 struct buffer_head *tmp_bh;
4198 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
4201 SB_ONDISK_JOURNAL_SIZE(sb)));
4202 set_buffer_uptodate(tmp_bh);
4203 page = cn->bh->b_page;
4205 memcpy(tmp_bh->b_data,
4206 addr + offset_in_page(cn->bh->b_data),
4209 mark_buffer_dirty(tmp_bh);
4211 set_buffer_journal_dirty(cn->bh);
4212 clear_buffer_journaled(cn->bh);
4215 * JDirty cleared sometime during transaction.
4216 * don't log this one
4218 reiserfs_warning(sb, "journal-2048",
4219 "BAD, buffer in journal hash, "
4226 reiserfs_cond_resched(sb);
4230 * we are done with both the c_bh and d_bh, but
4231 * c_bh must be written after all other commit blocks,
4232 * so we dirty/relse c_bh in flush_commit_list, with commit_left <= 1.
4235 journal->j_current_jl = alloc_journal_list(sb);
4237 /* now it is safe to insert this transaction on the main list */
4238 list_add_tail(&jl->j_list, &journal->j_journal_list);
4239 list_add_tail(&jl->j_working_list, &journal->j_working_list);
4240 journal->j_num_work_lists++;
4242 /* reset journal values for the next transaction */
4243 old_start = journal->j_start;
4245 (journal->j_start + journal->j_len +
4246 2) % SB_ONDISK_JOURNAL_SIZE(sb);
4247 atomic_set(&(journal->j_wcount), 0);
4248 journal->j_bcount = 0;
4249 journal->j_last = NULL;
4250 journal->j_first = NULL;
4252 journal->j_trans_start_time = 0;
4253 /* check for trans_id overflow */
4254 if (++journal->j_trans_id == 0)
4255 journal->j_trans_id = 10;
4256 journal->j_current_jl->j_trans_id = journal->j_trans_id;
4257 journal->j_must_wait = 0;
4258 journal->j_len_alloc = 0;
4259 journal->j_next_full_flush = 0;
4260 journal->j_next_async_flush = 0;
4261 init_journal_hash(sb);
4264 * make sure reiserfs_add_jh sees the new current_jl before we
4265 * write out the tails
4270 * tail conversion targets have to hit the disk before we end the
4271 * transaction. Otherwise a later transaction might repack the tail
4272 * before this transaction commits, leaving the data block unflushed
4273 * and clean, if we crash before the later transaction commits, the
4274 * data block is lost.
4276 if (!list_empty(&jl->j_tail_bh_list)) {
4277 depth = reiserfs_write_unlock_nested(sb);
4278 write_ordered_buffers(&journal->j_dirty_buffers_lock,
4279 journal, jl, &jl->j_tail_bh_list);
4280 reiserfs_write_lock_nested(sb, depth);
4282 BUG_ON(!list_empty(&jl->j_tail_bh_list));
4283 mutex_unlock(&jl->j_commit_mutex);
4286 * honor the flush wishes from the caller, simple commits can
4287 * be done outside the journal lock, they are done below
4289 * if we don't flush the commit list right now, we put it into
4290 * the work queue so the people waiting on the async progress work
4291 * queue don't wait for this proc to flush journal lists and such.
4294 flush_commit_list(sb, jl, 1);
4295 flush_journal_list(sb, jl, 1);
4296 } else if (!(jl->j_state & LIST_COMMIT_PENDING))
4297 queue_delayed_work(REISERFS_SB(sb)->commit_wq,
4298 &journal->j_work, HZ / 10);
4301 * if the next transaction has any chance of wrapping, flush
4302 * transactions that might get overwritten. If any journal lists
4303 * are very old flush them as well.
4306 list_for_each_safe(entry, safe, &journal->j_journal_list) {
4307 temp_jl = JOURNAL_LIST_ENTRY(entry);
4308 if (journal->j_start <= temp_jl->j_start) {
4309 if ((journal->j_start + journal->j_trans_max + 1) >=
4311 flush_used_journal_lists(sb, temp_jl);
4313 } else if ((journal->j_start +
4314 journal->j_trans_max + 1) <
4315 SB_ONDISK_JOURNAL_SIZE(sb)) {
4317 * if we don't cross into the next
4318 * transaction and we don't wrap, there is
4319 * no way we can overlap any later transactions
4324 } else if ((journal->j_start +
4325 journal->j_trans_max + 1) >
4326 SB_ONDISK_JOURNAL_SIZE(sb)) {
4327 if (((journal->j_start + journal->j_trans_max + 1) %
4328 SB_ONDISK_JOURNAL_SIZE(sb)) >=
4330 flush_used_journal_lists(sb, temp_jl);
4334 * we don't overlap anything from out start
4335 * to the end of the log, and our wrapped
4336 * portion doesn't overlap anything at
4337 * the start of the log. We can break
4344 journal->j_current_jl->j_list_bitmap =
4345 get_list_bitmap(sb, journal->j_current_jl);
4347 if (!(journal->j_current_jl->j_list_bitmap)) {
4348 reiserfs_panic(sb, "journal-1996",
4349 "could not get a list bitmap");
4352 atomic_set(&(journal->j_jlock), 0);
4354 /* wake up any body waiting to join. */
4355 clear_bit(J_WRITERS_QUEUED, &journal->j_state);
4356 wake_up(&(journal->j_join_wait));
4358 if (!flush && wait_on_commit &&
4359 journal_list_still_alive(sb, commit_trans_id)) {
4360 flush_commit_list(sb, jl, 1);
4363 reiserfs_check_lock_depth(sb, "journal end2");
4365 memset(th, 0, sizeof(*th));
4367 * Re-set th->t_super, so we can properly keep track of how many
4368 * persistent transactions there are. We need to do this so if this
4369 * call is part of a failed restart_transaction, we can free it later
4373 return journal->j_errno;
4376 /* Send the file system read only and refuse new transactions */
4377 void reiserfs_abort_journal(struct super_block *sb, int errno)
4379 struct reiserfs_journal *journal = SB_JOURNAL(sb);
4380 if (test_bit(J_ABORTED, &journal->j_state))
4383 if (!journal->j_errno)
4384 journal->j_errno = errno;
4386 sb->s_flags |= MS_RDONLY;
4387 set_bit(J_ABORTED, &journal->j_state);
4389 #ifdef CONFIG_REISERFS_CHECK