FRV: Use generic show_interrupts()
[cris-mirror.git] / fs / reiserfs / journal.c
blobc77514bd57765b7472f8bb460ecc4667dd5328da
1 /*
2 ** Write ahead logging implementation copyright Chris Mason 2000
3 **
4 ** The background commits make this code very interelated, and
5 ** overly complex. I need to rethink things a bit....The major players:
6 **
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
27 ** transaction.
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
32 ** around too long.
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>
40 #include <linux/reiserfs_fs.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>
54 #include <asm/system.h>
56 /* gets a struct reiserfs_journal_list * from a list head */
57 #define JOURNAL_LIST_ENTRY(h) (list_entry((h), struct reiserfs_journal_list, \
58 j_list))
59 #define JOURNAL_WORK_ENTRY(h) (list_entry((h), struct reiserfs_journal_list, \
60 j_working_list))
62 /* the number of mounted filesystems. This is used to decide when to
63 ** start and kill the commit workqueue
65 static int reiserfs_mounted_fs_count;
67 static struct workqueue_struct *commit_wq;
69 #define JOURNAL_TRANS_HALF 1018 /* must be correct to keep the desc and commit
70 structs at 4k */
71 #define BUFNR 64 /*read ahead */
73 /* cnode stat bits. Move these into reiserfs_fs.h */
75 #define BLOCK_FREED 2 /* this block was freed, and can't be written. */
76 #define BLOCK_FREED_HOLDER 3 /* this block was freed during this transaction, and can't be written */
78 #define BLOCK_NEEDS_FLUSH 4 /* used in flush_journal_list */
79 #define BLOCK_DIRTIED 5
81 /* journal list state bits */
82 #define LIST_TOUCHED 1
83 #define LIST_DIRTY 2
84 #define LIST_COMMIT_PENDING 4 /* someone will commit this list */
86 /* flags for do_journal_end */
87 #define FLUSH_ALL 1 /* flush commit and real blocks */
88 #define COMMIT_NOW 2 /* end and commit this transaction */
89 #define WAIT 4 /* wait for the log blocks to hit the disk */
91 static int do_journal_end(struct reiserfs_transaction_handle *,
92 struct super_block *, unsigned long nblocks,
93 int flags);
94 static int flush_journal_list(struct super_block *s,
95 struct reiserfs_journal_list *jl, int flushall);
96 static int flush_commit_list(struct super_block *s,
97 struct reiserfs_journal_list *jl, int flushall);
98 static int can_dirty(struct reiserfs_journal_cnode *cn);
99 static int journal_join(struct reiserfs_transaction_handle *th,
100 struct super_block *sb, unsigned long nblocks);
101 static int release_journal_dev(struct super_block *super,
102 struct reiserfs_journal *journal);
103 static int dirty_one_transaction(struct super_block *s,
104 struct reiserfs_journal_list *jl);
105 static void flush_async_commits(struct work_struct *work);
106 static void queue_log_writer(struct super_block *s);
108 /* values for join in do_journal_begin_r */
109 enum {
110 JBEGIN_REG = 0, /* regular journal begin */
111 JBEGIN_JOIN = 1, /* join the running transaction if at all possible */
112 JBEGIN_ABORT = 2, /* called from cleanup code, ignores aborted flag */
115 static int do_journal_begin_r(struct reiserfs_transaction_handle *th,
116 struct super_block *sb,
117 unsigned long nblocks, int join);
119 static void init_journal_hash(struct super_block *sb)
121 struct reiserfs_journal *journal = SB_JOURNAL(sb);
122 memset(journal->j_hash_table, 0,
123 JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *));
127 ** clears BH_Dirty and sticks the buffer on the clean list. Called because I can't allow refile_buffer to
128 ** make schedule happen after I've freed a block. Look at remove_from_transaction and journal_mark_freed for
129 ** more details.
131 static int reiserfs_clean_and_file_buffer(struct buffer_head *bh)
133 if (bh) {
134 clear_buffer_dirty(bh);
135 clear_buffer_journal_test(bh);
137 return 0;
140 static struct reiserfs_bitmap_node *allocate_bitmap_node(struct super_block
141 *sb)
143 struct reiserfs_bitmap_node *bn;
144 static int id;
146 bn = kmalloc(sizeof(struct reiserfs_bitmap_node), GFP_NOFS);
147 if (!bn) {
148 return NULL;
150 bn->data = kzalloc(sb->s_blocksize, GFP_NOFS);
151 if (!bn->data) {
152 kfree(bn);
153 return NULL;
155 bn->id = id++;
156 INIT_LIST_HEAD(&bn->list);
157 return bn;
160 static struct reiserfs_bitmap_node *get_bitmap_node(struct super_block *sb)
162 struct reiserfs_journal *journal = SB_JOURNAL(sb);
163 struct reiserfs_bitmap_node *bn = NULL;
164 struct list_head *entry = journal->j_bitmap_nodes.next;
166 journal->j_used_bitmap_nodes++;
167 repeat:
169 if (entry != &journal->j_bitmap_nodes) {
170 bn = list_entry(entry, struct reiserfs_bitmap_node, list);
171 list_del(entry);
172 memset(bn->data, 0, sb->s_blocksize);
173 journal->j_free_bitmap_nodes--;
174 return bn;
176 bn = allocate_bitmap_node(sb);
177 if (!bn) {
178 yield();
179 goto repeat;
181 return bn;
183 static inline void free_bitmap_node(struct super_block *sb,
184 struct reiserfs_bitmap_node *bn)
186 struct reiserfs_journal *journal = SB_JOURNAL(sb);
187 journal->j_used_bitmap_nodes--;
188 if (journal->j_free_bitmap_nodes > REISERFS_MAX_BITMAP_NODES) {
189 kfree(bn->data);
190 kfree(bn);
191 } else {
192 list_add(&bn->list, &journal->j_bitmap_nodes);
193 journal->j_free_bitmap_nodes++;
197 static void allocate_bitmap_nodes(struct super_block *sb)
199 int i;
200 struct reiserfs_journal *journal = SB_JOURNAL(sb);
201 struct reiserfs_bitmap_node *bn = NULL;
202 for (i = 0; i < REISERFS_MIN_BITMAP_NODES; i++) {
203 bn = allocate_bitmap_node(sb);
204 if (bn) {
205 list_add(&bn->list, &journal->j_bitmap_nodes);
206 journal->j_free_bitmap_nodes++;
207 } else {
208 break; /* this is ok, we'll try again when more are needed */
213 static int set_bit_in_list_bitmap(struct super_block *sb,
214 b_blocknr_t block,
215 struct reiserfs_list_bitmap *jb)
217 unsigned int bmap_nr = block / (sb->s_blocksize << 3);
218 unsigned int bit_nr = block % (sb->s_blocksize << 3);
220 if (!jb->bitmaps[bmap_nr]) {
221 jb->bitmaps[bmap_nr] = get_bitmap_node(sb);
223 set_bit(bit_nr, (unsigned long *)jb->bitmaps[bmap_nr]->data);
224 return 0;
227 static void cleanup_bitmap_list(struct super_block *sb,
228 struct reiserfs_list_bitmap *jb)
230 int i;
231 if (jb->bitmaps == NULL)
232 return;
234 for (i = 0; i < reiserfs_bmap_count(sb); i++) {
235 if (jb->bitmaps[i]) {
236 free_bitmap_node(sb, jb->bitmaps[i]);
237 jb->bitmaps[i] = NULL;
243 ** only call this on FS unmount.
245 static int free_list_bitmaps(struct super_block *sb,
246 struct reiserfs_list_bitmap *jb_array)
248 int i;
249 struct reiserfs_list_bitmap *jb;
250 for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
251 jb = jb_array + i;
252 jb->journal_list = NULL;
253 cleanup_bitmap_list(sb, jb);
254 vfree(jb->bitmaps);
255 jb->bitmaps = NULL;
257 return 0;
260 static int free_bitmap_nodes(struct super_block *sb)
262 struct reiserfs_journal *journal = SB_JOURNAL(sb);
263 struct list_head *next = journal->j_bitmap_nodes.next;
264 struct reiserfs_bitmap_node *bn;
266 while (next != &journal->j_bitmap_nodes) {
267 bn = list_entry(next, struct reiserfs_bitmap_node, list);
268 list_del(next);
269 kfree(bn->data);
270 kfree(bn);
271 next = journal->j_bitmap_nodes.next;
272 journal->j_free_bitmap_nodes--;
275 return 0;
279 ** get memory for JOURNAL_NUM_BITMAPS worth of bitmaps.
280 ** jb_array is the array to be filled in.
282 int reiserfs_allocate_list_bitmaps(struct super_block *sb,
283 struct reiserfs_list_bitmap *jb_array,
284 unsigned int bmap_nr)
286 int i;
287 int failed = 0;
288 struct reiserfs_list_bitmap *jb;
289 int mem = bmap_nr * sizeof(struct reiserfs_bitmap_node *);
291 for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
292 jb = jb_array + i;
293 jb->journal_list = NULL;
294 jb->bitmaps = vmalloc(mem);
295 if (!jb->bitmaps) {
296 reiserfs_warning(sb, "clm-2000", "unable to "
297 "allocate bitmaps for journal lists");
298 failed = 1;
299 break;
301 memset(jb->bitmaps, 0, mem);
303 if (failed) {
304 free_list_bitmaps(sb, jb_array);
305 return -1;
307 return 0;
311 ** find an available list bitmap. If you can't find one, flush a commit list
312 ** and try again
314 static struct reiserfs_list_bitmap *get_list_bitmap(struct super_block *sb,
315 struct reiserfs_journal_list
316 *jl)
318 int i, j;
319 struct reiserfs_journal *journal = SB_JOURNAL(sb);
320 struct reiserfs_list_bitmap *jb = NULL;
322 for (j = 0; j < (JOURNAL_NUM_BITMAPS * 3); j++) {
323 i = journal->j_list_bitmap_index;
324 journal->j_list_bitmap_index = (i + 1) % JOURNAL_NUM_BITMAPS;
325 jb = journal->j_list_bitmap + i;
326 if (journal->j_list_bitmap[i].journal_list) {
327 flush_commit_list(sb,
328 journal->j_list_bitmap[i].
329 journal_list, 1);
330 if (!journal->j_list_bitmap[i].journal_list) {
331 break;
333 } else {
334 break;
337 if (jb->journal_list) { /* double check to make sure if flushed correctly */
338 return NULL;
340 jb->journal_list = jl;
341 return jb;
345 ** allocates a new chunk of X nodes, and links them all together as a list.
346 ** Uses the cnode->next and cnode->prev pointers
347 ** returns NULL on failure
349 static struct reiserfs_journal_cnode *allocate_cnodes(int num_cnodes)
351 struct reiserfs_journal_cnode *head;
352 int i;
353 if (num_cnodes <= 0) {
354 return NULL;
356 head = vmalloc(num_cnodes * sizeof(struct reiserfs_journal_cnode));
357 if (!head) {
358 return NULL;
360 memset(head, 0, num_cnodes * sizeof(struct reiserfs_journal_cnode));
361 head[0].prev = NULL;
362 head[0].next = head + 1;
363 for (i = 1; i < num_cnodes; i++) {
364 head[i].prev = head + (i - 1);
365 head[i].next = head + (i + 1); /* if last one, overwrite it after the if */
367 head[num_cnodes - 1].next = NULL;
368 return head;
372 ** pulls a cnode off the free list, or returns NULL on failure
374 static struct reiserfs_journal_cnode *get_cnode(struct super_block *sb)
376 struct reiserfs_journal_cnode *cn;
377 struct reiserfs_journal *journal = SB_JOURNAL(sb);
379 reiserfs_check_lock_depth(sb, "get_cnode");
381 if (journal->j_cnode_free <= 0) {
382 return NULL;
384 journal->j_cnode_used++;
385 journal->j_cnode_free--;
386 cn = journal->j_cnode_free_list;
387 if (!cn) {
388 return cn;
390 if (cn->next) {
391 cn->next->prev = NULL;
393 journal->j_cnode_free_list = cn->next;
394 memset(cn, 0, sizeof(struct reiserfs_journal_cnode));
395 return cn;
399 ** returns a cnode to the free list
401 static void free_cnode(struct super_block *sb,
402 struct reiserfs_journal_cnode *cn)
404 struct reiserfs_journal *journal = SB_JOURNAL(sb);
406 reiserfs_check_lock_depth(sb, "free_cnode");
408 journal->j_cnode_used--;
409 journal->j_cnode_free++;
410 /* memset(cn, 0, sizeof(struct reiserfs_journal_cnode)) ; */
411 cn->next = journal->j_cnode_free_list;
412 if (journal->j_cnode_free_list) {
413 journal->j_cnode_free_list->prev = cn;
415 cn->prev = NULL; /* not needed with the memset, but I might kill the memset, and forget to do this */
416 journal->j_cnode_free_list = cn;
419 static void clear_prepared_bits(struct buffer_head *bh)
421 clear_buffer_journal_prepared(bh);
422 clear_buffer_journal_restore_dirty(bh);
425 /* return a cnode with same dev, block number and size in table, or null if not found */
426 static inline struct reiserfs_journal_cnode *get_journal_hash_dev(struct
427 super_block
428 *sb,
429 struct
430 reiserfs_journal_cnode
431 **table,
432 long bl)
434 struct reiserfs_journal_cnode *cn;
435 cn = journal_hash(table, sb, bl);
436 while (cn) {
437 if (cn->blocknr == bl && cn->sb == sb)
438 return cn;
439 cn = cn->hnext;
441 return (struct reiserfs_journal_cnode *)0;
445 ** this actually means 'can this block be reallocated yet?'. If you set search_all, a block can only be allocated
446 ** if it is not in the current transaction, was not freed by the current transaction, and has no chance of ever
447 ** being overwritten by a replay after crashing.
449 ** If you don't set search_all, a block can only be allocated if it is not in the current transaction. Since deleting
450 ** a block removes it from the current transaction, this case should never happen. If you don't set search_all, make
451 ** sure you never write the block without logging it.
453 ** next_zero_bit is a suggestion about the next block to try for find_forward.
454 ** when bl is rejected because it is set in a journal list bitmap, we search
455 ** for the next zero bit in the bitmap that rejected bl. Then, we return that
456 ** through next_zero_bit for find_forward to try.
458 ** Just because we return something in next_zero_bit does not mean we won't
459 ** reject it on the next call to reiserfs_in_journal
462 int reiserfs_in_journal(struct super_block *sb,
463 unsigned int bmap_nr, int bit_nr, int search_all,
464 b_blocknr_t * next_zero_bit)
466 struct reiserfs_journal *journal = SB_JOURNAL(sb);
467 struct reiserfs_journal_cnode *cn;
468 struct reiserfs_list_bitmap *jb;
469 int i;
470 unsigned long bl;
472 *next_zero_bit = 0; /* always start this at zero. */
474 PROC_INFO_INC(sb, journal.in_journal);
475 /* If we aren't doing a search_all, this is a metablock, and it will be logged before use.
476 ** if we crash before the transaction that freed it commits, this transaction won't
477 ** have committed either, and the block will never be written
479 if (search_all) {
480 for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
481 PROC_INFO_INC(sb, journal.in_journal_bitmap);
482 jb = journal->j_list_bitmap + i;
483 if (jb->journal_list && jb->bitmaps[bmap_nr] &&
484 test_bit(bit_nr,
485 (unsigned long *)jb->bitmaps[bmap_nr]->
486 data)) {
487 *next_zero_bit =
488 find_next_zero_bit((unsigned long *)
489 (jb->bitmaps[bmap_nr]->
490 data),
491 sb->s_blocksize << 3,
492 bit_nr + 1);
493 return 1;
498 bl = bmap_nr * (sb->s_blocksize << 3) + bit_nr;
499 /* is it in any old transactions? */
500 if (search_all
501 && (cn =
502 get_journal_hash_dev(sb, journal->j_list_hash_table, bl))) {
503 return 1;
506 /* is it in the current transaction. This should never happen */
507 if ((cn = get_journal_hash_dev(sb, journal->j_hash_table, bl))) {
508 BUG();
509 return 1;
512 PROC_INFO_INC(sb, journal.in_journal_reusable);
513 /* safe for reuse */
514 return 0;
517 /* insert cn into table
519 static inline void insert_journal_hash(struct reiserfs_journal_cnode **table,
520 struct reiserfs_journal_cnode *cn)
522 struct reiserfs_journal_cnode *cn_orig;
524 cn_orig = journal_hash(table, cn->sb, cn->blocknr);
525 cn->hnext = cn_orig;
526 cn->hprev = NULL;
527 if (cn_orig) {
528 cn_orig->hprev = cn;
530 journal_hash(table, cn->sb, cn->blocknr) = cn;
533 /* lock the current transaction */
534 static inline void lock_journal(struct super_block *sb)
536 PROC_INFO_INC(sb, journal.lock_journal);
538 reiserfs_mutex_lock_safe(&SB_JOURNAL(sb)->j_mutex, sb);
541 /* unlock the current transaction */
542 static inline void unlock_journal(struct super_block *sb)
544 mutex_unlock(&SB_JOURNAL(sb)->j_mutex);
547 static inline void get_journal_list(struct reiserfs_journal_list *jl)
549 jl->j_refcount++;
552 static inline void put_journal_list(struct super_block *s,
553 struct reiserfs_journal_list *jl)
555 if (jl->j_refcount < 1) {
556 reiserfs_panic(s, "journal-2", "trans id %u, refcount at %d",
557 jl->j_trans_id, jl->j_refcount);
559 if (--jl->j_refcount == 0)
560 kfree(jl);
564 ** this used to be much more involved, and I'm keeping it just in case things get ugly again.
565 ** it gets called by flush_commit_list, and cleans up any data stored about blocks freed during a
566 ** transaction.
568 static void cleanup_freed_for_journal_list(struct super_block *sb,
569 struct reiserfs_journal_list *jl)
572 struct reiserfs_list_bitmap *jb = jl->j_list_bitmap;
573 if (jb) {
574 cleanup_bitmap_list(sb, jb);
576 jl->j_list_bitmap->journal_list = NULL;
577 jl->j_list_bitmap = NULL;
580 static int journal_list_still_alive(struct super_block *s,
581 unsigned int trans_id)
583 struct reiserfs_journal *journal = SB_JOURNAL(s);
584 struct list_head *entry = &journal->j_journal_list;
585 struct reiserfs_journal_list *jl;
587 if (!list_empty(entry)) {
588 jl = JOURNAL_LIST_ENTRY(entry->next);
589 if (jl->j_trans_id <= trans_id) {
590 return 1;
593 return 0;
597 * If page->mapping was null, we failed to truncate this page for
598 * some reason. Most likely because it was truncated after being
599 * logged via data=journal.
601 * This does a check to see if the buffer belongs to one of these
602 * lost pages before doing the final put_bh. If page->mapping was
603 * null, it tries to free buffers on the page, which should make the
604 * final page_cache_release drop the page from the lru.
606 static void release_buffer_page(struct buffer_head *bh)
608 struct page *page = bh->b_page;
609 if (!page->mapping && trylock_page(page)) {
610 page_cache_get(page);
611 put_bh(bh);
612 if (!page->mapping)
613 try_to_free_buffers(page);
614 unlock_page(page);
615 page_cache_release(page);
616 } else {
617 put_bh(bh);
621 static void reiserfs_end_buffer_io_sync(struct buffer_head *bh, int uptodate)
623 char b[BDEVNAME_SIZE];
625 if (buffer_journaled(bh)) {
626 reiserfs_warning(NULL, "clm-2084",
627 "pinned buffer %lu:%s sent to disk",
628 bh->b_blocknr, bdevname(bh->b_bdev, b));
630 if (uptodate)
631 set_buffer_uptodate(bh);
632 else
633 clear_buffer_uptodate(bh);
635 unlock_buffer(bh);
636 release_buffer_page(bh);
639 static void reiserfs_end_ordered_io(struct buffer_head *bh, int uptodate)
641 if (uptodate)
642 set_buffer_uptodate(bh);
643 else
644 clear_buffer_uptodate(bh);
645 unlock_buffer(bh);
646 put_bh(bh);
649 static void submit_logged_buffer(struct buffer_head *bh)
651 get_bh(bh);
652 bh->b_end_io = reiserfs_end_buffer_io_sync;
653 clear_buffer_journal_new(bh);
654 clear_buffer_dirty(bh);
655 if (!test_clear_buffer_journal_test(bh))
656 BUG();
657 if (!buffer_uptodate(bh))
658 BUG();
659 submit_bh(WRITE, bh);
662 static void submit_ordered_buffer(struct buffer_head *bh)
664 get_bh(bh);
665 bh->b_end_io = reiserfs_end_ordered_io;
666 clear_buffer_dirty(bh);
667 if (!buffer_uptodate(bh))
668 BUG();
669 submit_bh(WRITE, bh);
672 #define CHUNK_SIZE 32
673 struct buffer_chunk {
674 struct buffer_head *bh[CHUNK_SIZE];
675 int nr;
678 static void write_chunk(struct buffer_chunk *chunk)
680 int i;
681 get_fs_excl();
682 for (i = 0; i < chunk->nr; i++) {
683 submit_logged_buffer(chunk->bh[i]);
685 chunk->nr = 0;
686 put_fs_excl();
689 static void write_ordered_chunk(struct buffer_chunk *chunk)
691 int i;
692 get_fs_excl();
693 for (i = 0; i < chunk->nr; i++) {
694 submit_ordered_buffer(chunk->bh[i]);
696 chunk->nr = 0;
697 put_fs_excl();
700 static int add_to_chunk(struct buffer_chunk *chunk, struct buffer_head *bh,
701 spinlock_t * lock, void (fn) (struct buffer_chunk *))
703 int ret = 0;
704 BUG_ON(chunk->nr >= CHUNK_SIZE);
705 chunk->bh[chunk->nr++] = bh;
706 if (chunk->nr >= CHUNK_SIZE) {
707 ret = 1;
708 if (lock)
709 spin_unlock(lock);
710 fn(chunk);
711 if (lock)
712 spin_lock(lock);
714 return ret;
717 static atomic_t nr_reiserfs_jh = ATOMIC_INIT(0);
718 static struct reiserfs_jh *alloc_jh(void)
720 struct reiserfs_jh *jh;
721 while (1) {
722 jh = kmalloc(sizeof(*jh), GFP_NOFS);
723 if (jh) {
724 atomic_inc(&nr_reiserfs_jh);
725 return jh;
727 yield();
732 * we want to free the jh when the buffer has been written
733 * and waited on
735 void reiserfs_free_jh(struct buffer_head *bh)
737 struct reiserfs_jh *jh;
739 jh = bh->b_private;
740 if (jh) {
741 bh->b_private = NULL;
742 jh->bh = NULL;
743 list_del_init(&jh->list);
744 kfree(jh);
745 if (atomic_read(&nr_reiserfs_jh) <= 0)
746 BUG();
747 atomic_dec(&nr_reiserfs_jh);
748 put_bh(bh);
752 static inline int __add_jh(struct reiserfs_journal *j, struct buffer_head *bh,
753 int tail)
755 struct reiserfs_jh *jh;
757 if (bh->b_private) {
758 spin_lock(&j->j_dirty_buffers_lock);
759 if (!bh->b_private) {
760 spin_unlock(&j->j_dirty_buffers_lock);
761 goto no_jh;
763 jh = bh->b_private;
764 list_del_init(&jh->list);
765 } else {
766 no_jh:
767 get_bh(bh);
768 jh = alloc_jh();
769 spin_lock(&j->j_dirty_buffers_lock);
770 /* buffer must be locked for __add_jh, should be able to have
771 * two adds at the same time
773 BUG_ON(bh->b_private);
774 jh->bh = bh;
775 bh->b_private = jh;
777 jh->jl = j->j_current_jl;
778 if (tail)
779 list_add_tail(&jh->list, &jh->jl->j_tail_bh_list);
780 else {
781 list_add_tail(&jh->list, &jh->jl->j_bh_list);
783 spin_unlock(&j->j_dirty_buffers_lock);
784 return 0;
787 int reiserfs_add_tail_list(struct inode *inode, struct buffer_head *bh)
789 return __add_jh(SB_JOURNAL(inode->i_sb), bh, 1);
791 int reiserfs_add_ordered_list(struct inode *inode, struct buffer_head *bh)
793 return __add_jh(SB_JOURNAL(inode->i_sb), bh, 0);
796 #define JH_ENTRY(l) list_entry((l), struct reiserfs_jh, list)
797 static int write_ordered_buffers(spinlock_t * lock,
798 struct reiserfs_journal *j,
799 struct reiserfs_journal_list *jl,
800 struct list_head *list)
802 struct buffer_head *bh;
803 struct reiserfs_jh *jh;
804 int ret = j->j_errno;
805 struct buffer_chunk chunk;
806 struct list_head tmp;
807 INIT_LIST_HEAD(&tmp);
809 chunk.nr = 0;
810 spin_lock(lock);
811 while (!list_empty(list)) {
812 jh = JH_ENTRY(list->next);
813 bh = jh->bh;
814 get_bh(bh);
815 if (!trylock_buffer(bh)) {
816 if (!buffer_dirty(bh)) {
817 list_move(&jh->list, &tmp);
818 goto loop_next;
820 spin_unlock(lock);
821 if (chunk.nr)
822 write_ordered_chunk(&chunk);
823 wait_on_buffer(bh);
824 cond_resched();
825 spin_lock(lock);
826 goto loop_next;
828 /* in theory, dirty non-uptodate buffers should never get here,
829 * but the upper layer io error paths still have a few quirks.
830 * Handle them here as gracefully as we can
832 if (!buffer_uptodate(bh) && buffer_dirty(bh)) {
833 clear_buffer_dirty(bh);
834 ret = -EIO;
836 if (buffer_dirty(bh)) {
837 list_move(&jh->list, &tmp);
838 add_to_chunk(&chunk, bh, lock, write_ordered_chunk);
839 } else {
840 reiserfs_free_jh(bh);
841 unlock_buffer(bh);
843 loop_next:
844 put_bh(bh);
845 cond_resched_lock(lock);
847 if (chunk.nr) {
848 spin_unlock(lock);
849 write_ordered_chunk(&chunk);
850 spin_lock(lock);
852 while (!list_empty(&tmp)) {
853 jh = JH_ENTRY(tmp.prev);
854 bh = jh->bh;
855 get_bh(bh);
856 reiserfs_free_jh(bh);
858 if (buffer_locked(bh)) {
859 spin_unlock(lock);
860 wait_on_buffer(bh);
861 spin_lock(lock);
863 if (!buffer_uptodate(bh)) {
864 ret = -EIO;
866 /* ugly interaction with invalidatepage here.
867 * reiserfs_invalidate_page will pin any buffer that has a valid
868 * journal head from an older transaction. If someone else sets
869 * our buffer dirty after we write it in the first loop, and
870 * then someone truncates the page away, nobody will ever write
871 * the buffer. We're safe if we write the page one last time
872 * after freeing the journal header.
874 if (buffer_dirty(bh) && unlikely(bh->b_page->mapping == NULL)) {
875 spin_unlock(lock);
876 ll_rw_block(WRITE, 1, &bh);
877 spin_lock(lock);
879 put_bh(bh);
880 cond_resched_lock(lock);
882 spin_unlock(lock);
883 return ret;
886 static int flush_older_commits(struct super_block *s,
887 struct reiserfs_journal_list *jl)
889 struct reiserfs_journal *journal = SB_JOURNAL(s);
890 struct reiserfs_journal_list *other_jl;
891 struct reiserfs_journal_list *first_jl;
892 struct list_head *entry;
893 unsigned int trans_id = jl->j_trans_id;
894 unsigned int other_trans_id;
895 unsigned int first_trans_id;
897 find_first:
899 * first we walk backwards to find the oldest uncommitted transation
901 first_jl = jl;
902 entry = jl->j_list.prev;
903 while (1) {
904 other_jl = JOURNAL_LIST_ENTRY(entry);
905 if (entry == &journal->j_journal_list ||
906 atomic_read(&other_jl->j_older_commits_done))
907 break;
909 first_jl = other_jl;
910 entry = other_jl->j_list.prev;
913 /* if we didn't find any older uncommitted transactions, return now */
914 if (first_jl == jl) {
915 return 0;
918 first_trans_id = first_jl->j_trans_id;
920 entry = &first_jl->j_list;
921 while (1) {
922 other_jl = JOURNAL_LIST_ENTRY(entry);
923 other_trans_id = other_jl->j_trans_id;
925 if (other_trans_id < trans_id) {
926 if (atomic_read(&other_jl->j_commit_left) != 0) {
927 flush_commit_list(s, other_jl, 0);
929 /* list we were called with is gone, return */
930 if (!journal_list_still_alive(s, trans_id))
931 return 1;
933 /* the one we just flushed is gone, this means all
934 * older lists are also gone, so first_jl is no longer
935 * valid either. Go back to the beginning.
937 if (!journal_list_still_alive
938 (s, other_trans_id)) {
939 goto find_first;
942 entry = entry->next;
943 if (entry == &journal->j_journal_list)
944 return 0;
945 } else {
946 return 0;
949 return 0;
952 static int reiserfs_async_progress_wait(struct super_block *s)
954 struct reiserfs_journal *j = SB_JOURNAL(s);
956 if (atomic_read(&j->j_async_throttle)) {
957 reiserfs_write_unlock(s);
958 congestion_wait(BLK_RW_ASYNC, HZ / 10);
959 reiserfs_write_lock(s);
962 return 0;
966 ** if this journal list still has commit blocks unflushed, send them to disk.
968 ** log areas must be flushed in order (transaction 2 can't commit before transaction 1)
969 ** Before the commit block can by written, every other log block must be safely on disk
972 static int flush_commit_list(struct super_block *s,
973 struct reiserfs_journal_list *jl, int flushall)
975 int i;
976 b_blocknr_t bn;
977 struct buffer_head *tbh = NULL;
978 unsigned int trans_id = jl->j_trans_id;
979 struct reiserfs_journal *journal = SB_JOURNAL(s);
980 int retval = 0;
981 int write_len;
983 reiserfs_check_lock_depth(s, "flush_commit_list");
985 if (atomic_read(&jl->j_older_commits_done)) {
986 return 0;
989 get_fs_excl();
991 /* before we can put our commit blocks on disk, we have to make sure everyone older than
992 ** us is on disk too
994 BUG_ON(jl->j_len <= 0);
995 BUG_ON(trans_id == journal->j_trans_id);
997 get_journal_list(jl);
998 if (flushall) {
999 if (flush_older_commits(s, jl) == 1) {
1000 /* list disappeared during flush_older_commits. return */
1001 goto put_jl;
1005 /* make sure nobody is trying to flush this one at the same time */
1006 reiserfs_mutex_lock_safe(&jl->j_commit_mutex, s);
1008 if (!journal_list_still_alive(s, trans_id)) {
1009 mutex_unlock(&jl->j_commit_mutex);
1010 goto put_jl;
1012 BUG_ON(jl->j_trans_id == 0);
1014 /* this commit is done, exit */
1015 if (atomic_read(&(jl->j_commit_left)) <= 0) {
1016 if (flushall) {
1017 atomic_set(&(jl->j_older_commits_done), 1);
1019 mutex_unlock(&jl->j_commit_mutex);
1020 goto put_jl;
1023 if (!list_empty(&jl->j_bh_list)) {
1024 int ret;
1027 * We might sleep in numerous places inside
1028 * write_ordered_buffers. Relax the write lock.
1030 reiserfs_write_unlock(s);
1031 ret = write_ordered_buffers(&journal->j_dirty_buffers_lock,
1032 journal, jl, &jl->j_bh_list);
1033 if (ret < 0 && retval == 0)
1034 retval = ret;
1035 reiserfs_write_lock(s);
1037 BUG_ON(!list_empty(&jl->j_bh_list));
1039 * for the description block and all the log blocks, submit any buffers
1040 * that haven't already reached the disk. Try to write at least 256
1041 * log blocks. later on, we will only wait on blocks that correspond
1042 * to this transaction, but while we're unplugging we might as well
1043 * get a chunk of data on there.
1045 atomic_inc(&journal->j_async_throttle);
1046 write_len = jl->j_len + 1;
1047 if (write_len < 256)
1048 write_len = 256;
1049 for (i = 0 ; i < write_len ; i++) {
1050 bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) + (jl->j_start + i) %
1051 SB_ONDISK_JOURNAL_SIZE(s);
1052 tbh = journal_find_get_block(s, bn);
1053 if (tbh) {
1054 if (buffer_dirty(tbh)) {
1055 reiserfs_write_unlock(s);
1056 ll_rw_block(WRITE, 1, &tbh);
1057 reiserfs_write_lock(s);
1059 put_bh(tbh) ;
1062 atomic_dec(&journal->j_async_throttle);
1064 for (i = 0; i < (jl->j_len + 1); i++) {
1065 bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) +
1066 (jl->j_start + i) % SB_ONDISK_JOURNAL_SIZE(s);
1067 tbh = journal_find_get_block(s, bn);
1069 reiserfs_write_unlock(s);
1070 wait_on_buffer(tbh);
1071 reiserfs_write_lock(s);
1072 // since we're using ll_rw_blk above, it might have skipped over
1073 // a locked buffer. Double check here
1075 /* redundant, sync_dirty_buffer() checks */
1076 if (buffer_dirty(tbh)) {
1077 reiserfs_write_unlock(s);
1078 sync_dirty_buffer(tbh);
1079 reiserfs_write_lock(s);
1081 if (unlikely(!buffer_uptodate(tbh))) {
1082 #ifdef CONFIG_REISERFS_CHECK
1083 reiserfs_warning(s, "journal-601",
1084 "buffer write failed");
1085 #endif
1086 retval = -EIO;
1088 put_bh(tbh); /* once for journal_find_get_block */
1089 put_bh(tbh); /* once due to original getblk in do_journal_end */
1090 atomic_dec(&(jl->j_commit_left));
1093 BUG_ON(atomic_read(&(jl->j_commit_left)) != 1);
1095 /* If there was a write error in the journal - we can't commit
1096 * this transaction - it will be invalid and, if successful,
1097 * will just end up propagating the write error out to
1098 * the file system. */
1099 if (likely(!retval && !reiserfs_is_journal_aborted (journal))) {
1100 if (buffer_dirty(jl->j_commit_bh))
1101 BUG();
1102 mark_buffer_dirty(jl->j_commit_bh) ;
1103 reiserfs_write_unlock(s);
1104 if (reiserfs_barrier_flush(s))
1105 __sync_dirty_buffer(jl->j_commit_bh, WRITE_FLUSH_FUA);
1106 else
1107 sync_dirty_buffer(jl->j_commit_bh);
1108 reiserfs_write_lock(s);
1111 /* If there was a write error in the journal - we can't commit this
1112 * transaction - it will be invalid and, if successful, will just end
1113 * up propagating the write error out to the filesystem. */
1114 if (unlikely(!buffer_uptodate(jl->j_commit_bh))) {
1115 #ifdef CONFIG_REISERFS_CHECK
1116 reiserfs_warning(s, "journal-615", "buffer write failed");
1117 #endif
1118 retval = -EIO;
1120 bforget(jl->j_commit_bh);
1121 if (journal->j_last_commit_id != 0 &&
1122 (jl->j_trans_id - journal->j_last_commit_id) != 1) {
1123 reiserfs_warning(s, "clm-2200", "last commit %lu, current %lu",
1124 journal->j_last_commit_id, jl->j_trans_id);
1126 journal->j_last_commit_id = jl->j_trans_id;
1128 /* now, every commit block is on the disk. It is safe to allow blocks freed during this transaction to be reallocated */
1129 cleanup_freed_for_journal_list(s, jl);
1131 retval = retval ? retval : journal->j_errno;
1133 /* mark the metadata dirty */
1134 if (!retval)
1135 dirty_one_transaction(s, jl);
1136 atomic_dec(&(jl->j_commit_left));
1138 if (flushall) {
1139 atomic_set(&(jl->j_older_commits_done), 1);
1141 mutex_unlock(&jl->j_commit_mutex);
1142 put_jl:
1143 put_journal_list(s, jl);
1145 if (retval)
1146 reiserfs_abort(s, retval, "Journal write error in %s",
1147 __func__);
1148 put_fs_excl();
1149 return retval;
1153 ** flush_journal_list frequently needs to find a newer transaction for a given block. This does that, or
1154 ** returns NULL if it can't find anything
1156 static struct reiserfs_journal_list *find_newer_jl_for_cn(struct
1157 reiserfs_journal_cnode
1158 *cn)
1160 struct super_block *sb = cn->sb;
1161 b_blocknr_t blocknr = cn->blocknr;
1163 cn = cn->hprev;
1164 while (cn) {
1165 if (cn->sb == sb && cn->blocknr == blocknr && cn->jlist) {
1166 return cn->jlist;
1168 cn = cn->hprev;
1170 return NULL;
1173 static int newer_jl_done(struct reiserfs_journal_cnode *cn)
1175 struct super_block *sb = cn->sb;
1176 b_blocknr_t blocknr = cn->blocknr;
1178 cn = cn->hprev;
1179 while (cn) {
1180 if (cn->sb == sb && cn->blocknr == blocknr && cn->jlist &&
1181 atomic_read(&cn->jlist->j_commit_left) != 0)
1182 return 0;
1183 cn = cn->hprev;
1185 return 1;
1188 static void remove_journal_hash(struct super_block *,
1189 struct reiserfs_journal_cnode **,
1190 struct reiserfs_journal_list *, unsigned long,
1191 int);
1194 ** once all the real blocks have been flushed, it is safe to remove them from the
1195 ** journal list for this transaction. Aside from freeing the cnode, this also allows the
1196 ** block to be reallocated for data blocks if it had been deleted.
1198 static void remove_all_from_journal_list(struct super_block *sb,
1199 struct reiserfs_journal_list *jl,
1200 int debug)
1202 struct reiserfs_journal *journal = SB_JOURNAL(sb);
1203 struct reiserfs_journal_cnode *cn, *last;
1204 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?
1209 while (cn) {
1210 if (cn->blocknr != 0) {
1211 if (debug) {
1212 reiserfs_warning(sb, "reiserfs-2201",
1213 "block %u, bh is %d, state %ld",
1214 cn->blocknr, cn->bh ? 1 : 0,
1215 cn->state);
1217 cn->state = 0;
1218 remove_journal_hash(sb, journal->j_list_hash_table,
1219 jl, cn->blocknr, 1);
1221 last = cn;
1222 cn = cn->next;
1223 free_cnode(sb, last);
1225 jl->j_realblock = NULL;
1229 ** if this timestamp is greater than the timestamp we wrote last to the header block, write it to the header block.
1230 ** once this is done, I can safely say the log area for this transaction won't ever be replayed, and I can start
1231 ** releasing blocks in this transaction for reuse as data blocks.
1232 ** called by flush_journal_list, before it calls remove_all_from_journal_list
1235 static int _update_journal_header_block(struct super_block *sb,
1236 unsigned long offset,
1237 unsigned int trans_id)
1239 struct reiserfs_journal_header *jh;
1240 struct reiserfs_journal *journal = SB_JOURNAL(sb);
1242 if (reiserfs_is_journal_aborted(journal))
1243 return -EIO;
1245 if (trans_id >= journal->j_last_flush_trans_id) {
1246 if (buffer_locked((journal->j_header_bh))) {
1247 reiserfs_write_unlock(sb);
1248 wait_on_buffer((journal->j_header_bh));
1249 reiserfs_write_lock(sb);
1250 if (unlikely(!buffer_uptodate(journal->j_header_bh))) {
1251 #ifdef CONFIG_REISERFS_CHECK
1252 reiserfs_warning(sb, "journal-699",
1253 "buffer write failed");
1254 #endif
1255 return -EIO;
1258 journal->j_last_flush_trans_id = trans_id;
1259 journal->j_first_unflushed_offset = offset;
1260 jh = (struct reiserfs_journal_header *)(journal->j_header_bh->
1261 b_data);
1262 jh->j_last_flush_trans_id = cpu_to_le32(trans_id);
1263 jh->j_first_unflushed_offset = cpu_to_le32(offset);
1264 jh->j_mount_id = cpu_to_le32(journal->j_mount_id);
1266 set_buffer_dirty(journal->j_header_bh);
1267 reiserfs_write_unlock(sb);
1269 if (reiserfs_barrier_flush(sb))
1270 __sync_dirty_buffer(journal->j_header_bh, WRITE_FLUSH_FUA);
1271 else
1272 sync_dirty_buffer(journal->j_header_bh);
1274 reiserfs_write_lock(sb);
1275 if (!buffer_uptodate(journal->j_header_bh)) {
1276 reiserfs_warning(sb, "journal-837",
1277 "IO error during journal replay");
1278 return -EIO;
1281 return 0;
1284 static int update_journal_header_block(struct super_block *sb,
1285 unsigned long offset,
1286 unsigned int trans_id)
1288 return _update_journal_header_block(sb, offset, trans_id);
1292 ** flush any and all journal lists older than you are
1293 ** can only be called from flush_journal_list
1295 static int flush_older_journal_lists(struct super_block *sb,
1296 struct reiserfs_journal_list *jl)
1298 struct list_head *entry;
1299 struct reiserfs_journal_list *other_jl;
1300 struct reiserfs_journal *journal = SB_JOURNAL(sb);
1301 unsigned int trans_id = jl->j_trans_id;
1303 /* we know we are the only ones flushing things, no extra race
1304 * protection is required.
1306 restart:
1307 entry = journal->j_journal_list.next;
1308 /* Did we wrap? */
1309 if (entry == &journal->j_journal_list)
1310 return 0;
1311 other_jl = JOURNAL_LIST_ENTRY(entry);
1312 if (other_jl->j_trans_id < trans_id) {
1313 BUG_ON(other_jl->j_refcount <= 0);
1314 /* do not flush all */
1315 flush_journal_list(sb, other_jl, 0);
1317 /* other_jl is now deleted from the list */
1318 goto restart;
1320 return 0;
1323 static void del_from_work_list(struct super_block *s,
1324 struct reiserfs_journal_list *jl)
1326 struct reiserfs_journal *journal = SB_JOURNAL(s);
1327 if (!list_empty(&jl->j_working_list)) {
1328 list_del_init(&jl->j_working_list);
1329 journal->j_num_work_lists--;
1333 /* flush a journal list, both commit and real blocks
1335 ** always set flushall to 1, unless you are calling from inside
1336 ** flush_journal_list
1338 ** IMPORTANT. This can only be called while there are no journal writers,
1339 ** and the journal is locked. That means it can only be called from
1340 ** do_journal_end, or by journal_release
1342 static int flush_journal_list(struct super_block *s,
1343 struct reiserfs_journal_list *jl, int flushall)
1345 struct reiserfs_journal_list *pjl;
1346 struct reiserfs_journal_cnode *cn, *last;
1347 int count;
1348 int was_jwait = 0;
1349 int was_dirty = 0;
1350 struct buffer_head *saved_bh;
1351 unsigned long j_len_saved = jl->j_len;
1352 struct reiserfs_journal *journal = SB_JOURNAL(s);
1353 int err = 0;
1355 BUG_ON(j_len_saved <= 0);
1357 if (atomic_read(&journal->j_wcount) != 0) {
1358 reiserfs_warning(s, "clm-2048", "called with wcount %d",
1359 atomic_read(&journal->j_wcount));
1361 BUG_ON(jl->j_trans_id == 0);
1363 /* if flushall == 0, the lock is already held */
1364 if (flushall) {
1365 reiserfs_mutex_lock_safe(&journal->j_flush_mutex, s);
1366 } else if (mutex_trylock(&journal->j_flush_mutex)) {
1367 BUG();
1370 count = 0;
1371 if (j_len_saved > journal->j_trans_max) {
1372 reiserfs_panic(s, "journal-715", "length is %lu, trans id %lu",
1373 j_len_saved, jl->j_trans_id);
1374 return 0;
1377 get_fs_excl();
1379 /* if all the work is already done, get out of here */
1380 if (atomic_read(&(jl->j_nonzerolen)) <= 0 &&
1381 atomic_read(&(jl->j_commit_left)) <= 0) {
1382 goto flush_older_and_return;
1385 /* start by putting the commit list on disk. This will also flush
1386 ** the commit lists of any olders transactions
1388 flush_commit_list(s, jl, 1);
1390 if (!(jl->j_state & LIST_DIRTY)
1391 && !reiserfs_is_journal_aborted(journal))
1392 BUG();
1394 /* are we done now? */
1395 if (atomic_read(&(jl->j_nonzerolen)) <= 0 &&
1396 atomic_read(&(jl->j_commit_left)) <= 0) {
1397 goto flush_older_and_return;
1400 /* loop through each cnode, see if we need to write it,
1401 ** or wait on a more recent transaction, or just ignore it
1403 if (atomic_read(&(journal->j_wcount)) != 0) {
1404 reiserfs_panic(s, "journal-844", "journal list is flushing, "
1405 "wcount is not 0");
1407 cn = jl->j_realblock;
1408 while (cn) {
1409 was_jwait = 0;
1410 was_dirty = 0;
1411 saved_bh = NULL;
1412 /* blocknr of 0 is no longer in the hash, ignore it */
1413 if (cn->blocknr == 0) {
1414 goto free_cnode;
1417 /* This transaction failed commit. Don't write out to the disk */
1418 if (!(jl->j_state & LIST_DIRTY))
1419 goto free_cnode;
1421 pjl = find_newer_jl_for_cn(cn);
1422 /* the order is important here. We check pjl to make sure we
1423 ** don't clear BH_JDirty_wait if we aren't the one writing this
1424 ** block to disk
1426 if (!pjl && cn->bh) {
1427 saved_bh = cn->bh;
1429 /* we do this to make sure nobody releases the buffer while
1430 ** we are working with it
1432 get_bh(saved_bh);
1434 if (buffer_journal_dirty(saved_bh)) {
1435 BUG_ON(!can_dirty(cn));
1436 was_jwait = 1;
1437 was_dirty = 1;
1438 } else if (can_dirty(cn)) {
1439 /* everything with !pjl && jwait should be writable */
1440 BUG();
1444 /* if someone has this block in a newer transaction, just make
1445 ** sure they are committed, and don't try writing it to disk
1447 if (pjl) {
1448 if (atomic_read(&pjl->j_commit_left))
1449 flush_commit_list(s, pjl, 1);
1450 goto free_cnode;
1453 /* bh == NULL when the block got to disk on its own, OR,
1454 ** the block got freed in a future transaction
1456 if (saved_bh == NULL) {
1457 goto free_cnode;
1460 /* this should never happen. kupdate_one_transaction has this list
1461 ** locked while it works, so we should never see a buffer here that
1462 ** is not marked JDirty_wait
1464 if ((!was_jwait) && !buffer_locked(saved_bh)) {
1465 reiserfs_warning(s, "journal-813",
1466 "BAD! buffer %llu %cdirty %cjwait, "
1467 "not in a newer tranasction",
1468 (unsigned long long)saved_bh->
1469 b_blocknr, was_dirty ? ' ' : '!',
1470 was_jwait ? ' ' : '!');
1472 if (was_dirty) {
1473 /* we inc again because saved_bh gets decremented at free_cnode */
1474 get_bh(saved_bh);
1475 set_bit(BLOCK_NEEDS_FLUSH, &cn->state);
1476 lock_buffer(saved_bh);
1477 BUG_ON(cn->blocknr != saved_bh->b_blocknr);
1478 if (buffer_dirty(saved_bh))
1479 submit_logged_buffer(saved_bh);
1480 else
1481 unlock_buffer(saved_bh);
1482 count++;
1483 } else {
1484 reiserfs_warning(s, "clm-2082",
1485 "Unable to flush buffer %llu in %s",
1486 (unsigned long long)saved_bh->
1487 b_blocknr, __func__);
1489 free_cnode:
1490 last = cn;
1491 cn = cn->next;
1492 if (saved_bh) {
1493 /* we incremented this to keep others from taking the buffer head away */
1494 put_bh(saved_bh);
1495 if (atomic_read(&(saved_bh->b_count)) < 0) {
1496 reiserfs_warning(s, "journal-945",
1497 "saved_bh->b_count < 0");
1501 if (count > 0) {
1502 cn = jl->j_realblock;
1503 while (cn) {
1504 if (test_bit(BLOCK_NEEDS_FLUSH, &cn->state)) {
1505 if (!cn->bh) {
1506 reiserfs_panic(s, "journal-1011",
1507 "cn->bh is NULL");
1510 reiserfs_write_unlock(s);
1511 wait_on_buffer(cn->bh);
1512 reiserfs_write_lock(s);
1514 if (!cn->bh) {
1515 reiserfs_panic(s, "journal-1012",
1516 "cn->bh is NULL");
1518 if (unlikely(!buffer_uptodate(cn->bh))) {
1519 #ifdef CONFIG_REISERFS_CHECK
1520 reiserfs_warning(s, "journal-949",
1521 "buffer write failed");
1522 #endif
1523 err = -EIO;
1525 /* note, we must clear the JDirty_wait bit after the up to date
1526 ** check, otherwise we race against our flushpage routine
1528 BUG_ON(!test_clear_buffer_journal_dirty
1529 (cn->bh));
1531 /* drop one ref for us */
1532 put_bh(cn->bh);
1533 /* drop one ref for journal_mark_dirty */
1534 release_buffer_page(cn->bh);
1536 cn = cn->next;
1540 if (err)
1541 reiserfs_abort(s, -EIO,
1542 "Write error while pushing transaction to disk in %s",
1543 __func__);
1544 flush_older_and_return:
1546 /* before we can update the journal header block, we _must_ flush all
1547 ** real blocks from all older transactions to disk. This is because
1548 ** once the header block is updated, this transaction will not be
1549 ** replayed after a crash
1551 if (flushall) {
1552 flush_older_journal_lists(s, jl);
1555 err = journal->j_errno;
1556 /* before we can remove everything from the hash tables for this
1557 ** transaction, we must make sure it can never be replayed
1559 ** since we are only called from do_journal_end, we know for sure there
1560 ** are no allocations going on while we are flushing journal lists. So,
1561 ** we only need to update the journal header block for the last list
1562 ** being flushed
1564 if (!err && flushall) {
1565 err =
1566 update_journal_header_block(s,
1567 (jl->j_start + jl->j_len +
1568 2) % SB_ONDISK_JOURNAL_SIZE(s),
1569 jl->j_trans_id);
1570 if (err)
1571 reiserfs_abort(s, -EIO,
1572 "Write error while updating journal header in %s",
1573 __func__);
1575 remove_all_from_journal_list(s, jl, 0);
1576 list_del_init(&jl->j_list);
1577 journal->j_num_lists--;
1578 del_from_work_list(s, jl);
1580 if (journal->j_last_flush_id != 0 &&
1581 (jl->j_trans_id - journal->j_last_flush_id) != 1) {
1582 reiserfs_warning(s, "clm-2201", "last flush %lu, current %lu",
1583 journal->j_last_flush_id, jl->j_trans_id);
1585 journal->j_last_flush_id = jl->j_trans_id;
1587 /* not strictly required since we are freeing the list, but it should
1588 * help find code using dead lists later on
1590 jl->j_len = 0;
1591 atomic_set(&(jl->j_nonzerolen), 0);
1592 jl->j_start = 0;
1593 jl->j_realblock = NULL;
1594 jl->j_commit_bh = NULL;
1595 jl->j_trans_id = 0;
1596 jl->j_state = 0;
1597 put_journal_list(s, jl);
1598 if (flushall)
1599 mutex_unlock(&journal->j_flush_mutex);
1600 put_fs_excl();
1601 return err;
1604 static int test_transaction(struct super_block *s,
1605 struct reiserfs_journal_list *jl)
1607 struct reiserfs_journal_cnode *cn;
1609 if (jl->j_len == 0 || atomic_read(&jl->j_nonzerolen) == 0)
1610 return 1;
1612 cn = jl->j_realblock;
1613 while (cn) {
1614 /* if the blocknr == 0, this has been cleared from the hash,
1615 ** skip it
1617 if (cn->blocknr == 0) {
1618 goto next;
1620 if (cn->bh && !newer_jl_done(cn))
1621 return 0;
1622 next:
1623 cn = cn->next;
1624 cond_resched();
1626 return 0;
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;
1634 int ret = 0;
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) {
1639 return 0;
1642 cn = jl->j_realblock;
1643 while (cn) {
1644 /* if the blocknr == 0, this has been cleared from the hash,
1645 ** skip it
1647 if (cn->blocknr == 0) {
1648 goto next;
1650 if (cn->bh && can_dirty(cn) && buffer_dirty(cn->bh)) {
1651 struct buffer_head *tmp_bh;
1652 /* we can race against journal_mark_freed when we try
1653 * to lock_buffer(cn->bh), so we have to inc the buffer
1654 * count, and recheck things after locking
1656 tmp_bh = cn->bh;
1657 get_bh(tmp_bh);
1658 lock_buffer(tmp_bh);
1659 if (cn->bh && can_dirty(cn) && buffer_dirty(tmp_bh)) {
1660 if (!buffer_journal_dirty(tmp_bh) ||
1661 buffer_journal_prepared(tmp_bh))
1662 BUG();
1663 add_to_chunk(chunk, tmp_bh, NULL, write_chunk);
1664 ret++;
1665 } else {
1666 /* note, cn->bh might be null now */
1667 unlock_buffer(tmp_bh);
1669 put_bh(tmp_bh);
1671 next:
1672 cn = cn->next;
1673 cond_resched();
1675 return ret;
1678 /* used by flush_commit_list */
1679 static int dirty_one_transaction(struct super_block *s,
1680 struct reiserfs_journal_list *jl)
1682 struct reiserfs_journal_cnode *cn;
1683 struct reiserfs_journal_list *pjl;
1684 int ret = 0;
1686 jl->j_state |= LIST_DIRTY;
1687 cn = jl->j_realblock;
1688 while (cn) {
1689 /* look for a more recent transaction that logged this
1690 ** buffer. Only the most recent transaction with a buffer in
1691 ** it is allowed to send that buffer to disk
1693 pjl = find_newer_jl_for_cn(cn);
1694 if (!pjl && cn->blocknr && cn->bh
1695 && buffer_journal_dirty(cn->bh)) {
1696 BUG_ON(!can_dirty(cn));
1697 /* if the buffer is prepared, it will either be logged
1698 * or restored. If restored, we need to make sure
1699 * it actually gets marked dirty
1701 clear_buffer_journal_new(cn->bh);
1702 if (buffer_journal_prepared(cn->bh)) {
1703 set_buffer_journal_restore_dirty(cn->bh);
1704 } else {
1705 set_buffer_journal_test(cn->bh);
1706 mark_buffer_dirty(cn->bh);
1709 cn = cn->next;
1711 return ret;
1714 static int kupdate_transactions(struct super_block *s,
1715 struct reiserfs_journal_list *jl,
1716 struct reiserfs_journal_list **next_jl,
1717 unsigned int *next_trans_id,
1718 int num_blocks, int num_trans)
1720 int ret = 0;
1721 int written = 0;
1722 int transactions_flushed = 0;
1723 unsigned int orig_trans_id = jl->j_trans_id;
1724 struct buffer_chunk chunk;
1725 struct list_head *entry;
1726 struct reiserfs_journal *journal = SB_JOURNAL(s);
1727 chunk.nr = 0;
1729 reiserfs_mutex_lock_safe(&journal->j_flush_mutex, s);
1730 if (!journal_list_still_alive(s, orig_trans_id)) {
1731 goto done;
1734 /* we've got j_flush_mutex held, nobody is going to delete any
1735 * of these lists out from underneath us
1737 while ((num_trans && transactions_flushed < num_trans) ||
1738 (!num_trans && written < num_blocks)) {
1740 if (jl->j_len == 0 || (jl->j_state & LIST_TOUCHED) ||
1741 atomic_read(&jl->j_commit_left)
1742 || !(jl->j_state & LIST_DIRTY)) {
1743 del_from_work_list(s, jl);
1744 break;
1746 ret = write_one_transaction(s, jl, &chunk);
1748 if (ret < 0)
1749 goto done;
1750 transactions_flushed++;
1751 written += ret;
1752 entry = jl->j_list.next;
1754 /* did we wrap? */
1755 if (entry == &journal->j_journal_list) {
1756 break;
1758 jl = JOURNAL_LIST_ENTRY(entry);
1760 /* don't bother with older transactions */
1761 if (jl->j_trans_id <= orig_trans_id)
1762 break;
1764 if (chunk.nr) {
1765 write_chunk(&chunk);
1768 done:
1769 mutex_unlock(&journal->j_flush_mutex);
1770 return ret;
1773 /* for o_sync and fsync heavy applications, they tend to use
1774 ** all the journa list slots with tiny transactions. These
1775 ** trigger lots and lots of calls to update the header block, which
1776 ** adds seeks and slows things down.
1778 ** This function tries to clear out a large chunk of the journal lists
1779 ** at once, which makes everything faster since only the newest journal
1780 ** list updates the header block
1782 static int flush_used_journal_lists(struct super_block *s,
1783 struct reiserfs_journal_list *jl)
1785 unsigned long len = 0;
1786 unsigned long cur_len;
1787 int ret;
1788 int i;
1789 int limit = 256;
1790 struct reiserfs_journal_list *tjl;
1791 struct reiserfs_journal_list *flush_jl;
1792 unsigned int trans_id;
1793 struct reiserfs_journal *journal = SB_JOURNAL(s);
1795 flush_jl = tjl = jl;
1797 /* in data logging mode, try harder to flush a lot of blocks */
1798 if (reiserfs_data_log(s))
1799 limit = 1024;
1800 /* flush for 256 transactions or limit blocks, whichever comes first */
1801 for (i = 0; i < 256 && len < limit; i++) {
1802 if (atomic_read(&tjl->j_commit_left) ||
1803 tjl->j_trans_id < jl->j_trans_id) {
1804 break;
1806 cur_len = atomic_read(&tjl->j_nonzerolen);
1807 if (cur_len > 0) {
1808 tjl->j_state &= ~LIST_TOUCHED;
1810 len += cur_len;
1811 flush_jl = tjl;
1812 if (tjl->j_list.next == &journal->j_journal_list)
1813 break;
1814 tjl = JOURNAL_LIST_ENTRY(tjl->j_list.next);
1816 /* try to find a group of blocks we can flush across all the
1817 ** transactions, but only bother if we've actually spanned
1818 ** across multiple lists
1820 if (flush_jl != jl) {
1821 ret = kupdate_transactions(s, jl, &tjl, &trans_id, len, i);
1823 flush_journal_list(s, flush_jl, 1);
1824 return 0;
1828 ** removes any nodes in table with name block and dev as bh.
1829 ** only touchs the hnext and hprev pointers.
1831 void remove_journal_hash(struct super_block *sb,
1832 struct reiserfs_journal_cnode **table,
1833 struct reiserfs_journal_list *jl,
1834 unsigned long block, int remove_freed)
1836 struct reiserfs_journal_cnode *cur;
1837 struct reiserfs_journal_cnode **head;
1839 head = &(journal_hash(table, sb, block));
1840 if (!head) {
1841 return;
1843 cur = *head;
1844 while (cur) {
1845 if (cur->blocknr == block && cur->sb == sb
1846 && (jl == NULL || jl == cur->jlist)
1847 && (!test_bit(BLOCK_FREED, &cur->state) || remove_freed)) {
1848 if (cur->hnext) {
1849 cur->hnext->hprev = cur->hprev;
1851 if (cur->hprev) {
1852 cur->hprev->hnext = cur->hnext;
1853 } else {
1854 *head = cur->hnext;
1856 cur->blocknr = 0;
1857 cur->sb = NULL;
1858 cur->state = 0;
1859 if (cur->bh && cur->jlist) /* anybody who clears the cur->bh will also dec the nonzerolen */
1860 atomic_dec(&(cur->jlist->j_nonzerolen));
1861 cur->bh = NULL;
1862 cur->jlist = NULL;
1864 cur = cur->hnext;
1868 static void free_journal_ram(struct super_block *sb)
1870 struct reiserfs_journal *journal = SB_JOURNAL(sb);
1871 kfree(journal->j_current_jl);
1872 journal->j_num_lists--;
1874 vfree(journal->j_cnode_free_orig);
1875 free_list_bitmaps(sb, journal->j_list_bitmap);
1876 free_bitmap_nodes(sb); /* must be after free_list_bitmaps */
1877 if (journal->j_header_bh) {
1878 brelse(journal->j_header_bh);
1880 /* j_header_bh is on the journal dev, make sure not to release the journal
1881 * dev until we brelse j_header_bh
1883 release_journal_dev(sb, journal);
1884 vfree(journal);
1888 ** call on unmount. Only set error to 1 if you haven't made your way out
1889 ** of read_super() yet. Any other caller must keep error at 0.
1891 static int do_journal_release(struct reiserfs_transaction_handle *th,
1892 struct super_block *sb, int error)
1894 struct reiserfs_transaction_handle myth;
1895 int flushed = 0;
1896 struct reiserfs_journal *journal = SB_JOURNAL(sb);
1898 /* we only want to flush out transactions if we were called with error == 0
1900 if (!error && !(sb->s_flags & MS_RDONLY)) {
1901 /* end the current trans */
1902 BUG_ON(!th->t_trans_id);
1903 do_journal_end(th, sb, 10, FLUSH_ALL);
1905 /* make sure something gets logged to force our way into the flush code */
1906 if (!journal_join(&myth, sb, 1)) {
1907 reiserfs_prepare_for_journal(sb,
1908 SB_BUFFER_WITH_SB(sb),
1910 journal_mark_dirty(&myth, sb,
1911 SB_BUFFER_WITH_SB(sb));
1912 do_journal_end(&myth, sb, 1, FLUSH_ALL);
1913 flushed = 1;
1917 /* this also catches errors during the do_journal_end above */
1918 if (!error && reiserfs_is_journal_aborted(journal)) {
1919 memset(&myth, 0, sizeof(myth));
1920 if (!journal_join_abort(&myth, sb, 1)) {
1921 reiserfs_prepare_for_journal(sb,
1922 SB_BUFFER_WITH_SB(sb),
1924 journal_mark_dirty(&myth, sb,
1925 SB_BUFFER_WITH_SB(sb));
1926 do_journal_end(&myth, sb, 1, FLUSH_ALL);
1930 reiserfs_mounted_fs_count--;
1931 /* wait for all commits to finish */
1932 cancel_delayed_work(&SB_JOURNAL(sb)->j_work);
1935 * We must release the write lock here because
1936 * the workqueue job (flush_async_commit) needs this lock
1938 reiserfs_write_unlock(sb);
1939 flush_workqueue(commit_wq);
1941 if (!reiserfs_mounted_fs_count) {
1942 destroy_workqueue(commit_wq);
1943 commit_wq = NULL;
1946 free_journal_ram(sb);
1948 reiserfs_write_lock(sb);
1950 return 0;
1954 ** call on unmount. flush all journal trans, release all alloc'd ram
1956 int journal_release(struct reiserfs_transaction_handle *th,
1957 struct super_block *sb)
1959 return do_journal_release(th, sb, 0);
1963 ** only call from an error condition inside reiserfs_read_super!
1965 int journal_release_error(struct reiserfs_transaction_handle *th,
1966 struct super_block *sb)
1968 return do_journal_release(th, sb, 1);
1971 /* compares description block with commit block. returns 1 if they differ, 0 if they are the same */
1972 static int journal_compare_desc_commit(struct super_block *sb,
1973 struct reiserfs_journal_desc *desc,
1974 struct reiserfs_journal_commit *commit)
1976 if (get_commit_trans_id(commit) != get_desc_trans_id(desc) ||
1977 get_commit_trans_len(commit) != get_desc_trans_len(desc) ||
1978 get_commit_trans_len(commit) > SB_JOURNAL(sb)->j_trans_max ||
1979 get_commit_trans_len(commit) <= 0) {
1980 return 1;
1982 return 0;
1985 /* returns 0 if it did not find a description block
1986 ** returns -1 if it found a corrupt commit block
1987 ** returns 1 if both desc and commit were valid
1989 static int journal_transaction_is_valid(struct super_block *sb,
1990 struct buffer_head *d_bh,
1991 unsigned int *oldest_invalid_trans_id,
1992 unsigned long *newest_mount_id)
1994 struct reiserfs_journal_desc *desc;
1995 struct reiserfs_journal_commit *commit;
1996 struct buffer_head *c_bh;
1997 unsigned long offset;
1999 if (!d_bh)
2000 return 0;
2002 desc = (struct reiserfs_journal_desc *)d_bh->b_data;
2003 if (get_desc_trans_len(desc) > 0
2004 && !memcmp(get_journal_desc_magic(d_bh), JOURNAL_DESC_MAGIC, 8)) {
2005 if (oldest_invalid_trans_id && *oldest_invalid_trans_id
2006 && get_desc_trans_id(desc) > *oldest_invalid_trans_id) {
2007 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2008 "journal-986: transaction "
2009 "is valid returning because trans_id %d is greater than "
2010 "oldest_invalid %lu",
2011 get_desc_trans_id(desc),
2012 *oldest_invalid_trans_id);
2013 return 0;
2015 if (newest_mount_id
2016 && *newest_mount_id > get_desc_mount_id(desc)) {
2017 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2018 "journal-1087: transaction "
2019 "is valid returning because mount_id %d is less than "
2020 "newest_mount_id %lu",
2021 get_desc_mount_id(desc),
2022 *newest_mount_id);
2023 return -1;
2025 if (get_desc_trans_len(desc) > SB_JOURNAL(sb)->j_trans_max) {
2026 reiserfs_warning(sb, "journal-2018",
2027 "Bad transaction length %d "
2028 "encountered, ignoring transaction",
2029 get_desc_trans_len(desc));
2030 return -1;
2032 offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2034 /* ok, we have a journal description block, lets see if the transaction was valid */
2035 c_bh =
2036 journal_bread(sb,
2037 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2038 ((offset + get_desc_trans_len(desc) +
2039 1) % SB_ONDISK_JOURNAL_SIZE(sb)));
2040 if (!c_bh)
2041 return 0;
2042 commit = (struct reiserfs_journal_commit *)c_bh->b_data;
2043 if (journal_compare_desc_commit(sb, desc, commit)) {
2044 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2045 "journal_transaction_is_valid, commit offset %ld had bad "
2046 "time %d or length %d",
2047 c_bh->b_blocknr -
2048 SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2049 get_commit_trans_id(commit),
2050 get_commit_trans_len(commit));
2051 brelse(c_bh);
2052 if (oldest_invalid_trans_id) {
2053 *oldest_invalid_trans_id =
2054 get_desc_trans_id(desc);
2055 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2056 "journal-1004: "
2057 "transaction_is_valid setting oldest invalid trans_id "
2058 "to %d",
2059 get_desc_trans_id(desc));
2061 return -1;
2063 brelse(c_bh);
2064 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2065 "journal-1006: found valid "
2066 "transaction start offset %llu, len %d id %d",
2067 d_bh->b_blocknr -
2068 SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2069 get_desc_trans_len(desc),
2070 get_desc_trans_id(desc));
2071 return 1;
2072 } else {
2073 return 0;
2077 static void brelse_array(struct buffer_head **heads, int num)
2079 int i;
2080 for (i = 0; i < num; i++) {
2081 brelse(heads[i]);
2086 ** given the start, and values for the oldest acceptable transactions,
2087 ** this either reads in a replays a transaction, or returns because the transaction
2088 ** is invalid, or too old.
2090 static int journal_read_transaction(struct super_block *sb,
2091 unsigned long cur_dblock,
2092 unsigned long oldest_start,
2093 unsigned int oldest_trans_id,
2094 unsigned long newest_mount_id)
2096 struct reiserfs_journal *journal = SB_JOURNAL(sb);
2097 struct reiserfs_journal_desc *desc;
2098 struct reiserfs_journal_commit *commit;
2099 unsigned int trans_id = 0;
2100 struct buffer_head *c_bh;
2101 struct buffer_head *d_bh;
2102 struct buffer_head **log_blocks = NULL;
2103 struct buffer_head **real_blocks = NULL;
2104 unsigned int trans_offset;
2105 int i;
2106 int trans_half;
2108 d_bh = journal_bread(sb, cur_dblock);
2109 if (!d_bh)
2110 return 1;
2111 desc = (struct reiserfs_journal_desc *)d_bh->b_data;
2112 trans_offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2113 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1037: "
2114 "journal_read_transaction, offset %llu, len %d mount_id %d",
2115 d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2116 get_desc_trans_len(desc), get_desc_mount_id(desc));
2117 if (get_desc_trans_id(desc) < oldest_trans_id) {
2118 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1039: "
2119 "journal_read_trans skipping because %lu is too old",
2120 cur_dblock -
2121 SB_ONDISK_JOURNAL_1st_BLOCK(sb));
2122 brelse(d_bh);
2123 return 1;
2125 if (get_desc_mount_id(desc) != newest_mount_id) {
2126 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1146: "
2127 "journal_read_trans skipping because %d is != "
2128 "newest_mount_id %lu", get_desc_mount_id(desc),
2129 newest_mount_id);
2130 brelse(d_bh);
2131 return 1;
2133 c_bh = journal_bread(sb, SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2134 ((trans_offset + get_desc_trans_len(desc) + 1) %
2135 SB_ONDISK_JOURNAL_SIZE(sb)));
2136 if (!c_bh) {
2137 brelse(d_bh);
2138 return 1;
2140 commit = (struct reiserfs_journal_commit *)c_bh->b_data;
2141 if (journal_compare_desc_commit(sb, desc, commit)) {
2142 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2143 "journal_read_transaction, "
2144 "commit offset %llu had bad time %d or length %d",
2145 c_bh->b_blocknr -
2146 SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2147 get_commit_trans_id(commit),
2148 get_commit_trans_len(commit));
2149 brelse(c_bh);
2150 brelse(d_bh);
2151 return 1;
2154 if (bdev_read_only(sb->s_bdev)) {
2155 reiserfs_warning(sb, "clm-2076",
2156 "device is readonly, unable to replay log");
2157 brelse(c_bh);
2158 brelse(d_bh);
2159 return -EROFS;
2162 trans_id = get_desc_trans_id(desc);
2163 /* now we know we've got a good transaction, and it was inside the valid time ranges */
2164 log_blocks = kmalloc(get_desc_trans_len(desc) *
2165 sizeof(struct buffer_head *), GFP_NOFS);
2166 real_blocks = kmalloc(get_desc_trans_len(desc) *
2167 sizeof(struct buffer_head *), GFP_NOFS);
2168 if (!log_blocks || !real_blocks) {
2169 brelse(c_bh);
2170 brelse(d_bh);
2171 kfree(log_blocks);
2172 kfree(real_blocks);
2173 reiserfs_warning(sb, "journal-1169",
2174 "kmalloc failed, unable to mount FS");
2175 return -1;
2177 /* get all the buffer heads */
2178 trans_half = journal_trans_half(sb->s_blocksize);
2179 for (i = 0; i < get_desc_trans_len(desc); i++) {
2180 log_blocks[i] =
2181 journal_getblk(sb,
2182 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2183 (trans_offset + 1 +
2184 i) % SB_ONDISK_JOURNAL_SIZE(sb));
2185 if (i < trans_half) {
2186 real_blocks[i] =
2187 sb_getblk(sb,
2188 le32_to_cpu(desc->j_realblock[i]));
2189 } else {
2190 real_blocks[i] =
2191 sb_getblk(sb,
2192 le32_to_cpu(commit->
2193 j_realblock[i - trans_half]));
2195 if (real_blocks[i]->b_blocknr > SB_BLOCK_COUNT(sb)) {
2196 reiserfs_warning(sb, "journal-1207",
2197 "REPLAY FAILURE fsck required! "
2198 "Block to replay is outside of "
2199 "filesystem");
2200 goto abort_replay;
2202 /* make sure we don't try to replay onto log or reserved area */
2203 if (is_block_in_log_or_reserved_area
2204 (sb, real_blocks[i]->b_blocknr)) {
2205 reiserfs_warning(sb, "journal-1204",
2206 "REPLAY FAILURE fsck required! "
2207 "Trying to replay onto a log block");
2208 abort_replay:
2209 brelse_array(log_blocks, i);
2210 brelse_array(real_blocks, i);
2211 brelse(c_bh);
2212 brelse(d_bh);
2213 kfree(log_blocks);
2214 kfree(real_blocks);
2215 return -1;
2218 /* read in the log blocks, memcpy to the corresponding real block */
2219 ll_rw_block(READ, get_desc_trans_len(desc), log_blocks);
2220 for (i = 0; i < get_desc_trans_len(desc); i++) {
2222 reiserfs_write_unlock(sb);
2223 wait_on_buffer(log_blocks[i]);
2224 reiserfs_write_lock(sb);
2226 if (!buffer_uptodate(log_blocks[i])) {
2227 reiserfs_warning(sb, "journal-1212",
2228 "REPLAY FAILURE fsck required! "
2229 "buffer write failed");
2230 brelse_array(log_blocks + i,
2231 get_desc_trans_len(desc) - i);
2232 brelse_array(real_blocks, get_desc_trans_len(desc));
2233 brelse(c_bh);
2234 brelse(d_bh);
2235 kfree(log_blocks);
2236 kfree(real_blocks);
2237 return -1;
2239 memcpy(real_blocks[i]->b_data, log_blocks[i]->b_data,
2240 real_blocks[i]->b_size);
2241 set_buffer_uptodate(real_blocks[i]);
2242 brelse(log_blocks[i]);
2244 /* flush out the real blocks */
2245 for (i = 0; i < get_desc_trans_len(desc); i++) {
2246 set_buffer_dirty(real_blocks[i]);
2247 write_dirty_buffer(real_blocks[i], WRITE);
2249 for (i = 0; i < get_desc_trans_len(desc); i++) {
2250 wait_on_buffer(real_blocks[i]);
2251 if (!buffer_uptodate(real_blocks[i])) {
2252 reiserfs_warning(sb, "journal-1226",
2253 "REPLAY FAILURE, fsck required! "
2254 "buffer write failed");
2255 brelse_array(real_blocks + i,
2256 get_desc_trans_len(desc) - i);
2257 brelse(c_bh);
2258 brelse(d_bh);
2259 kfree(log_blocks);
2260 kfree(real_blocks);
2261 return -1;
2263 brelse(real_blocks[i]);
2265 cur_dblock =
2266 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2267 ((trans_offset + get_desc_trans_len(desc) +
2268 2) % SB_ONDISK_JOURNAL_SIZE(sb));
2269 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2270 "journal-1095: setting journal " "start to offset %ld",
2271 cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb));
2273 /* init starting values for the first transaction, in case this is the last transaction to be replayed. */
2274 journal->j_start = cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2275 journal->j_last_flush_trans_id = trans_id;
2276 journal->j_trans_id = trans_id + 1;
2277 /* check for trans_id overflow */
2278 if (journal->j_trans_id == 0)
2279 journal->j_trans_id = 10;
2280 brelse(c_bh);
2281 brelse(d_bh);
2282 kfree(log_blocks);
2283 kfree(real_blocks);
2284 return 0;
2287 /* This function reads blocks starting from block and to max_block of bufsize
2288 size (but no more than BUFNR blocks at a time). This proved to improve
2289 mounting speed on self-rebuilding raid5 arrays at least.
2290 Right now it is only used from journal code. But later we might use it
2291 from other places.
2292 Note: Do not use journal_getblk/sb_getblk functions here! */
2293 static struct buffer_head *reiserfs_breada(struct block_device *dev,
2294 b_blocknr_t block, int bufsize,
2295 b_blocknr_t max_block)
2297 struct buffer_head *bhlist[BUFNR];
2298 unsigned int blocks = BUFNR;
2299 struct buffer_head *bh;
2300 int i, j;
2302 bh = __getblk(dev, block, bufsize);
2303 if (buffer_uptodate(bh))
2304 return (bh);
2306 if (block + BUFNR > max_block) {
2307 blocks = max_block - block;
2309 bhlist[0] = bh;
2310 j = 1;
2311 for (i = 1; i < blocks; i++) {
2312 bh = __getblk(dev, block + i, bufsize);
2313 if (buffer_uptodate(bh)) {
2314 brelse(bh);
2315 break;
2316 } else
2317 bhlist[j++] = bh;
2319 ll_rw_block(READ, j, bhlist);
2320 for (i = 1; i < j; i++)
2321 brelse(bhlist[i]);
2322 bh = bhlist[0];
2323 wait_on_buffer(bh);
2324 if (buffer_uptodate(bh))
2325 return bh;
2326 brelse(bh);
2327 return NULL;
2331 ** read and replay the log
2332 ** on a clean unmount, the journal header's next unflushed pointer will be to an invalid
2333 ** transaction. This tests that before finding all the transactions in the log, which makes normal mount times fast.
2335 ** After a crash, this starts with the next unflushed transaction, and replays until it finds one too old, or invalid.
2337 ** On exit, it sets things up so the first transaction will work correctly.
2339 static int journal_read(struct super_block *sb)
2341 struct reiserfs_journal *journal = SB_JOURNAL(sb);
2342 struct reiserfs_journal_desc *desc;
2343 unsigned int oldest_trans_id = 0;
2344 unsigned int oldest_invalid_trans_id = 0;
2345 time_t start;
2346 unsigned long oldest_start = 0;
2347 unsigned long cur_dblock = 0;
2348 unsigned long newest_mount_id = 9;
2349 struct buffer_head *d_bh;
2350 struct reiserfs_journal_header *jh;
2351 int valid_journal_header = 0;
2352 int replay_count = 0;
2353 int continue_replay = 1;
2354 int ret;
2355 char b[BDEVNAME_SIZE];
2357 cur_dblock = SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2358 reiserfs_info(sb, "checking transaction log (%s)\n",
2359 bdevname(journal->j_dev_bd, b));
2360 start = get_seconds();
2362 /* step 1, read in the journal header block. Check the transaction it says
2363 ** is the first unflushed, and if that transaction is not valid,
2364 ** replay is done
2366 journal->j_header_bh = journal_bread(sb,
2367 SB_ONDISK_JOURNAL_1st_BLOCK(sb)
2368 + SB_ONDISK_JOURNAL_SIZE(sb));
2369 if (!journal->j_header_bh) {
2370 return 1;
2372 jh = (struct reiserfs_journal_header *)(journal->j_header_bh->b_data);
2373 if (le32_to_cpu(jh->j_first_unflushed_offset) <
2374 SB_ONDISK_JOURNAL_SIZE(sb)
2375 && le32_to_cpu(jh->j_last_flush_trans_id) > 0) {
2376 oldest_start =
2377 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2378 le32_to_cpu(jh->j_first_unflushed_offset);
2379 oldest_trans_id = le32_to_cpu(jh->j_last_flush_trans_id) + 1;
2380 newest_mount_id = le32_to_cpu(jh->j_mount_id);
2381 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2382 "journal-1153: found in "
2383 "header: first_unflushed_offset %d, last_flushed_trans_id "
2384 "%lu", le32_to_cpu(jh->j_first_unflushed_offset),
2385 le32_to_cpu(jh->j_last_flush_trans_id));
2386 valid_journal_header = 1;
2388 /* now, we try to read the first unflushed offset. If it is not valid,
2389 ** there is nothing more we can do, and it makes no sense to read
2390 ** through the whole log.
2392 d_bh =
2393 journal_bread(sb,
2394 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2395 le32_to_cpu(jh->j_first_unflushed_offset));
2396 ret = journal_transaction_is_valid(sb, d_bh, NULL, NULL);
2397 if (!ret) {
2398 continue_replay = 0;
2400 brelse(d_bh);
2401 goto start_log_replay;
2404 /* ok, there are transactions that need to be replayed. start with the first log block, find
2405 ** all the valid transactions, and pick out the oldest.
2407 while (continue_replay
2408 && cur_dblock <
2409 (SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2410 SB_ONDISK_JOURNAL_SIZE(sb))) {
2411 /* Note that it is required for blocksize of primary fs device and journal
2412 device to be the same */
2413 d_bh =
2414 reiserfs_breada(journal->j_dev_bd, cur_dblock,
2415 sb->s_blocksize,
2416 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2417 SB_ONDISK_JOURNAL_SIZE(sb));
2418 ret =
2419 journal_transaction_is_valid(sb, d_bh,
2420 &oldest_invalid_trans_id,
2421 &newest_mount_id);
2422 if (ret == 1) {
2423 desc = (struct reiserfs_journal_desc *)d_bh->b_data;
2424 if (oldest_start == 0) { /* init all oldest_ values */
2425 oldest_trans_id = get_desc_trans_id(desc);
2426 oldest_start = d_bh->b_blocknr;
2427 newest_mount_id = get_desc_mount_id(desc);
2428 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2429 "journal-1179: Setting "
2430 "oldest_start to offset %llu, trans_id %lu",
2431 oldest_start -
2432 SB_ONDISK_JOURNAL_1st_BLOCK
2433 (sb), oldest_trans_id);
2434 } else if (oldest_trans_id > get_desc_trans_id(desc)) {
2435 /* one we just read was older */
2436 oldest_trans_id = get_desc_trans_id(desc);
2437 oldest_start = d_bh->b_blocknr;
2438 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2439 "journal-1180: Resetting "
2440 "oldest_start to offset %lu, trans_id %lu",
2441 oldest_start -
2442 SB_ONDISK_JOURNAL_1st_BLOCK
2443 (sb), oldest_trans_id);
2445 if (newest_mount_id < get_desc_mount_id(desc)) {
2446 newest_mount_id = get_desc_mount_id(desc);
2447 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2448 "journal-1299: Setting "
2449 "newest_mount_id to %d",
2450 get_desc_mount_id(desc));
2452 cur_dblock += get_desc_trans_len(desc) + 2;
2453 } else {
2454 cur_dblock++;
2456 brelse(d_bh);
2459 start_log_replay:
2460 cur_dblock = oldest_start;
2461 if (oldest_trans_id) {
2462 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2463 "journal-1206: Starting replay "
2464 "from offset %llu, trans_id %lu",
2465 cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2466 oldest_trans_id);
2469 replay_count = 0;
2470 while (continue_replay && oldest_trans_id > 0) {
2471 ret =
2472 journal_read_transaction(sb, cur_dblock, oldest_start,
2473 oldest_trans_id, newest_mount_id);
2474 if (ret < 0) {
2475 return ret;
2476 } else if (ret != 0) {
2477 break;
2479 cur_dblock =
2480 SB_ONDISK_JOURNAL_1st_BLOCK(sb) + journal->j_start;
2481 replay_count++;
2482 if (cur_dblock == oldest_start)
2483 break;
2486 if (oldest_trans_id == 0) {
2487 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2488 "journal-1225: No valid " "transactions found");
2490 /* j_start does not get set correctly if we don't replay any transactions.
2491 ** if we had a valid journal_header, set j_start to the first unflushed transaction value,
2492 ** copy the trans_id from the header
2494 if (valid_journal_header && replay_count == 0) {
2495 journal->j_start = le32_to_cpu(jh->j_first_unflushed_offset);
2496 journal->j_trans_id =
2497 le32_to_cpu(jh->j_last_flush_trans_id) + 1;
2498 /* check for trans_id overflow */
2499 if (journal->j_trans_id == 0)
2500 journal->j_trans_id = 10;
2501 journal->j_last_flush_trans_id =
2502 le32_to_cpu(jh->j_last_flush_trans_id);
2503 journal->j_mount_id = le32_to_cpu(jh->j_mount_id) + 1;
2504 } else {
2505 journal->j_mount_id = newest_mount_id + 1;
2507 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1299: Setting "
2508 "newest_mount_id to %lu", journal->j_mount_id);
2509 journal->j_first_unflushed_offset = journal->j_start;
2510 if (replay_count > 0) {
2511 reiserfs_info(sb,
2512 "replayed %d transactions in %lu seconds\n",
2513 replay_count, get_seconds() - start);
2515 if (!bdev_read_only(sb->s_bdev) &&
2516 _update_journal_header_block(sb, journal->j_start,
2517 journal->j_last_flush_trans_id)) {
2518 /* replay failed, caller must call free_journal_ram and abort
2519 ** the mount
2521 return -1;
2523 return 0;
2526 static struct reiserfs_journal_list *alloc_journal_list(struct super_block *s)
2528 struct reiserfs_journal_list *jl;
2529 jl = kzalloc(sizeof(struct reiserfs_journal_list),
2530 GFP_NOFS | __GFP_NOFAIL);
2531 INIT_LIST_HEAD(&jl->j_list);
2532 INIT_LIST_HEAD(&jl->j_working_list);
2533 INIT_LIST_HEAD(&jl->j_tail_bh_list);
2534 INIT_LIST_HEAD(&jl->j_bh_list);
2535 mutex_init(&jl->j_commit_mutex);
2536 SB_JOURNAL(s)->j_num_lists++;
2537 get_journal_list(jl);
2538 return jl;
2541 static void journal_list_init(struct super_block *sb)
2543 SB_JOURNAL(sb)->j_current_jl = alloc_journal_list(sb);
2546 static int release_journal_dev(struct super_block *super,
2547 struct reiserfs_journal *journal)
2549 int result;
2551 result = 0;
2553 if (journal->j_dev_bd != NULL) {
2554 result = blkdev_put(journal->j_dev_bd, journal->j_dev_mode);
2555 journal->j_dev_bd = NULL;
2558 if (result != 0) {
2559 reiserfs_warning(super, "sh-457",
2560 "Cannot release journal device: %i", result);
2562 return result;
2565 static int journal_init_dev(struct super_block *super,
2566 struct reiserfs_journal *journal,
2567 const char *jdev_name)
2569 int result;
2570 dev_t jdev;
2571 fmode_t blkdev_mode = FMODE_READ | FMODE_WRITE | FMODE_EXCL;
2572 char b[BDEVNAME_SIZE];
2574 result = 0;
2576 journal->j_dev_bd = NULL;
2577 jdev = SB_ONDISK_JOURNAL_DEVICE(super) ?
2578 new_decode_dev(SB_ONDISK_JOURNAL_DEVICE(super)) : super->s_dev;
2580 if (bdev_read_only(super->s_bdev))
2581 blkdev_mode = FMODE_READ;
2583 /* there is no "jdev" option and journal is on separate device */
2584 if ((!jdev_name || !jdev_name[0])) {
2585 if (jdev == super->s_dev)
2586 blkdev_mode &= ~FMODE_EXCL;
2587 journal->j_dev_bd = blkdev_get_by_dev(jdev, blkdev_mode,
2588 journal);
2589 journal->j_dev_mode = blkdev_mode;
2590 if (IS_ERR(journal->j_dev_bd)) {
2591 result = PTR_ERR(journal->j_dev_bd);
2592 journal->j_dev_bd = NULL;
2593 reiserfs_warning(super, "sh-458",
2594 "cannot init journal device '%s': %i",
2595 __bdevname(jdev, b), result);
2596 return result;
2597 } else if (jdev != super->s_dev)
2598 set_blocksize(journal->j_dev_bd, super->s_blocksize);
2600 return 0;
2603 journal->j_dev_mode = blkdev_mode;
2604 journal->j_dev_bd = blkdev_get_by_path(jdev_name, blkdev_mode, journal);
2605 if (IS_ERR(journal->j_dev_bd)) {
2606 result = PTR_ERR(journal->j_dev_bd);
2607 journal->j_dev_bd = NULL;
2608 reiserfs_warning(super,
2609 "journal_init_dev: Cannot open '%s': %i",
2610 jdev_name, result);
2611 return result;
2614 set_blocksize(journal->j_dev_bd, super->s_blocksize);
2615 reiserfs_info(super,
2616 "journal_init_dev: journal device: %s\n",
2617 bdevname(journal->j_dev_bd, b));
2618 return 0;
2622 * When creating/tuning a file system user can assign some
2623 * journal params within boundaries which depend on the ratio
2624 * blocksize/standard_blocksize.
2626 * For blocks >= standard_blocksize transaction size should
2627 * be not less then JOURNAL_TRANS_MIN_DEFAULT, and not more
2628 * then JOURNAL_TRANS_MAX_DEFAULT.
2630 * For blocks < standard_blocksize these boundaries should be
2631 * decreased proportionally.
2633 #define REISERFS_STANDARD_BLKSIZE (4096)
2635 static int check_advise_trans_params(struct super_block *sb,
2636 struct reiserfs_journal *journal)
2638 if (journal->j_trans_max) {
2639 /* Non-default journal params.
2640 Do sanity check for them. */
2641 int ratio = 1;
2642 if (sb->s_blocksize < REISERFS_STANDARD_BLKSIZE)
2643 ratio = REISERFS_STANDARD_BLKSIZE / sb->s_blocksize;
2645 if (journal->j_trans_max > JOURNAL_TRANS_MAX_DEFAULT / ratio ||
2646 journal->j_trans_max < JOURNAL_TRANS_MIN_DEFAULT / ratio ||
2647 SB_ONDISK_JOURNAL_SIZE(sb) / journal->j_trans_max <
2648 JOURNAL_MIN_RATIO) {
2649 reiserfs_warning(sb, "sh-462",
2650 "bad transaction max size (%u). "
2651 "FSCK?", journal->j_trans_max);
2652 return 1;
2654 if (journal->j_max_batch != (journal->j_trans_max) *
2655 JOURNAL_MAX_BATCH_DEFAULT/JOURNAL_TRANS_MAX_DEFAULT) {
2656 reiserfs_warning(sb, "sh-463",
2657 "bad transaction max batch (%u). "
2658 "FSCK?", journal->j_max_batch);
2659 return 1;
2661 } else {
2662 /* Default journal params.
2663 The file system was created by old version
2664 of mkreiserfs, so some fields contain zeros,
2665 and we need to advise proper values for them */
2666 if (sb->s_blocksize != REISERFS_STANDARD_BLKSIZE) {
2667 reiserfs_warning(sb, "sh-464", "bad blocksize (%u)",
2668 sb->s_blocksize);
2669 return 1;
2671 journal->j_trans_max = JOURNAL_TRANS_MAX_DEFAULT;
2672 journal->j_max_batch = JOURNAL_MAX_BATCH_DEFAULT;
2673 journal->j_max_commit_age = JOURNAL_MAX_COMMIT_AGE;
2675 return 0;
2679 ** must be called once on fs mount. calls journal_read for you
2681 int journal_init(struct super_block *sb, const char *j_dev_name,
2682 int old_format, unsigned int commit_max_age)
2684 int num_cnodes = SB_ONDISK_JOURNAL_SIZE(sb) * 2;
2685 struct buffer_head *bhjh;
2686 struct reiserfs_super_block *rs;
2687 struct reiserfs_journal_header *jh;
2688 struct reiserfs_journal *journal;
2689 struct reiserfs_journal_list *jl;
2690 char b[BDEVNAME_SIZE];
2691 int ret;
2694 * Unlock here to avoid various RECLAIM-FS-ON <-> IN-RECLAIM-FS
2695 * dependency inversion warnings.
2697 reiserfs_write_unlock(sb);
2698 journal = SB_JOURNAL(sb) = vmalloc(sizeof(struct reiserfs_journal));
2699 if (!journal) {
2700 reiserfs_warning(sb, "journal-1256",
2701 "unable to get memory for journal structure");
2702 reiserfs_write_lock(sb);
2703 return 1;
2705 memset(journal, 0, sizeof(struct reiserfs_journal));
2706 INIT_LIST_HEAD(&journal->j_bitmap_nodes);
2707 INIT_LIST_HEAD(&journal->j_prealloc_list);
2708 INIT_LIST_HEAD(&journal->j_working_list);
2709 INIT_LIST_HEAD(&journal->j_journal_list);
2710 journal->j_persistent_trans = 0;
2711 ret = reiserfs_allocate_list_bitmaps(sb, journal->j_list_bitmap,
2712 reiserfs_bmap_count(sb));
2713 reiserfs_write_lock(sb);
2714 if (ret)
2715 goto free_and_return;
2717 allocate_bitmap_nodes(sb);
2719 /* reserved for journal area support */
2720 SB_JOURNAL_1st_RESERVED_BLOCK(sb) = (old_format ?
2721 REISERFS_OLD_DISK_OFFSET_IN_BYTES
2722 / sb->s_blocksize +
2723 reiserfs_bmap_count(sb) +
2725 REISERFS_DISK_OFFSET_IN_BYTES /
2726 sb->s_blocksize + 2);
2728 /* Sanity check to see is the standard journal fitting withing first bitmap
2729 (actual for small blocksizes) */
2730 if (!SB_ONDISK_JOURNAL_DEVICE(sb) &&
2731 (SB_JOURNAL_1st_RESERVED_BLOCK(sb) +
2732 SB_ONDISK_JOURNAL_SIZE(sb) > sb->s_blocksize * 8)) {
2733 reiserfs_warning(sb, "journal-1393",
2734 "journal does not fit for area addressed "
2735 "by first of bitmap blocks. It starts at "
2736 "%u and its size is %u. Block size %ld",
2737 SB_JOURNAL_1st_RESERVED_BLOCK(sb),
2738 SB_ONDISK_JOURNAL_SIZE(sb),
2739 sb->s_blocksize);
2740 goto free_and_return;
2744 * We need to unlock here to avoid creating the following
2745 * dependency:
2746 * reiserfs_lock -> sysfs_mutex
2747 * Because the reiserfs mmap path creates the following dependency:
2748 * mm->mmap -> reiserfs_lock, hence we have
2749 * mm->mmap -> reiserfs_lock ->sysfs_mutex
2750 * This would ends up in a circular dependency with sysfs readdir path
2751 * which does sysfs_mutex -> mm->mmap_sem
2752 * This is fine because the reiserfs lock is useless in mount path,
2753 * at least until we call journal_begin. We keep it for paranoid
2754 * reasons.
2756 reiserfs_write_unlock(sb);
2757 if (journal_init_dev(sb, journal, j_dev_name) != 0) {
2758 reiserfs_write_lock(sb);
2759 reiserfs_warning(sb, "sh-462",
2760 "unable to initialize jornal device");
2761 goto free_and_return;
2763 reiserfs_write_lock(sb);
2765 rs = SB_DISK_SUPER_BLOCK(sb);
2767 /* read journal header */
2768 bhjh = journal_bread(sb,
2769 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2770 SB_ONDISK_JOURNAL_SIZE(sb));
2771 if (!bhjh) {
2772 reiserfs_warning(sb, "sh-459",
2773 "unable to read journal header");
2774 goto free_and_return;
2776 jh = (struct reiserfs_journal_header *)(bhjh->b_data);
2778 /* make sure that journal matches to the super block */
2779 if (is_reiserfs_jr(rs)
2780 && (le32_to_cpu(jh->jh_journal.jp_journal_magic) !=
2781 sb_jp_journal_magic(rs))) {
2782 reiserfs_warning(sb, "sh-460",
2783 "journal header magic %x (device %s) does "
2784 "not match to magic found in super block %x",
2785 jh->jh_journal.jp_journal_magic,
2786 bdevname(journal->j_dev_bd, b),
2787 sb_jp_journal_magic(rs));
2788 brelse(bhjh);
2789 goto free_and_return;
2792 journal->j_trans_max = le32_to_cpu(jh->jh_journal.jp_journal_trans_max);
2793 journal->j_max_batch = le32_to_cpu(jh->jh_journal.jp_journal_max_batch);
2794 journal->j_max_commit_age =
2795 le32_to_cpu(jh->jh_journal.jp_journal_max_commit_age);
2796 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
2798 if (check_advise_trans_params(sb, journal) != 0)
2799 goto free_and_return;
2800 journal->j_default_max_commit_age = journal->j_max_commit_age;
2802 if (commit_max_age != 0) {
2803 journal->j_max_commit_age = commit_max_age;
2804 journal->j_max_trans_age = commit_max_age;
2807 reiserfs_info(sb, "journal params: device %s, size %u, "
2808 "journal first block %u, max trans len %u, max batch %u, "
2809 "max commit age %u, max trans age %u\n",
2810 bdevname(journal->j_dev_bd, b),
2811 SB_ONDISK_JOURNAL_SIZE(sb),
2812 SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2813 journal->j_trans_max,
2814 journal->j_max_batch,
2815 journal->j_max_commit_age, journal->j_max_trans_age);
2817 brelse(bhjh);
2819 journal->j_list_bitmap_index = 0;
2820 journal_list_init(sb);
2822 memset(journal->j_list_hash_table, 0,
2823 JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *));
2825 INIT_LIST_HEAD(&journal->j_dirty_buffers);
2826 spin_lock_init(&journal->j_dirty_buffers_lock);
2828 journal->j_start = 0;
2829 journal->j_len = 0;
2830 journal->j_len_alloc = 0;
2831 atomic_set(&(journal->j_wcount), 0);
2832 atomic_set(&(journal->j_async_throttle), 0);
2833 journal->j_bcount = 0;
2834 journal->j_trans_start_time = 0;
2835 journal->j_last = NULL;
2836 journal->j_first = NULL;
2837 init_waitqueue_head(&(journal->j_join_wait));
2838 mutex_init(&journal->j_mutex);
2839 mutex_init(&journal->j_flush_mutex);
2841 journal->j_trans_id = 10;
2842 journal->j_mount_id = 10;
2843 journal->j_state = 0;
2844 atomic_set(&(journal->j_jlock), 0);
2845 reiserfs_write_unlock(sb);
2846 journal->j_cnode_free_list = allocate_cnodes(num_cnodes);
2847 reiserfs_write_lock(sb);
2848 journal->j_cnode_free_orig = journal->j_cnode_free_list;
2849 journal->j_cnode_free = journal->j_cnode_free_list ? num_cnodes : 0;
2850 journal->j_cnode_used = 0;
2851 journal->j_must_wait = 0;
2853 if (journal->j_cnode_free == 0) {
2854 reiserfs_warning(sb, "journal-2004", "Journal cnode memory "
2855 "allocation failed (%ld bytes). Journal is "
2856 "too large for available memory. Usually "
2857 "this is due to a journal that is too large.",
2858 sizeof (struct reiserfs_journal_cnode) * num_cnodes);
2859 goto free_and_return;
2862 init_journal_hash(sb);
2863 jl = journal->j_current_jl;
2864 jl->j_list_bitmap = get_list_bitmap(sb, jl);
2865 if (!jl->j_list_bitmap) {
2866 reiserfs_warning(sb, "journal-2005",
2867 "get_list_bitmap failed for journal list 0");
2868 goto free_and_return;
2870 if (journal_read(sb) < 0) {
2871 reiserfs_warning(sb, "reiserfs-2006",
2872 "Replay Failure, unable to mount");
2873 goto free_and_return;
2876 reiserfs_mounted_fs_count++;
2877 if (reiserfs_mounted_fs_count <= 1) {
2878 reiserfs_write_unlock(sb);
2879 commit_wq = alloc_workqueue("reiserfs", WQ_MEM_RECLAIM, 0);
2880 reiserfs_write_lock(sb);
2883 INIT_DELAYED_WORK(&journal->j_work, flush_async_commits);
2884 journal->j_work_sb = sb;
2885 return 0;
2886 free_and_return:
2887 free_journal_ram(sb);
2888 return 1;
2892 ** test for a polite end of the current transaction. Used by file_write, and should
2893 ** be used by delete to make sure they don't write more than can fit inside a single
2894 ** transaction
2896 int journal_transaction_should_end(struct reiserfs_transaction_handle *th,
2897 int new_alloc)
2899 struct reiserfs_journal *journal = SB_JOURNAL(th->t_super);
2900 time_t now = get_seconds();
2901 /* cannot restart while nested */
2902 BUG_ON(!th->t_trans_id);
2903 if (th->t_refcount > 1)
2904 return 0;
2905 if (journal->j_must_wait > 0 ||
2906 (journal->j_len_alloc + new_alloc) >= journal->j_max_batch ||
2907 atomic_read(&(journal->j_jlock)) ||
2908 (now - journal->j_trans_start_time) > journal->j_max_trans_age ||
2909 journal->j_cnode_free < (journal->j_trans_max * 3)) {
2910 return 1;
2912 /* protected by the BKL here */
2913 journal->j_len_alloc += new_alloc;
2914 th->t_blocks_allocated += new_alloc ;
2915 return 0;
2918 /* this must be called inside a transaction, and requires the
2919 ** kernel_lock to be held
2921 void reiserfs_block_writes(struct reiserfs_transaction_handle *th)
2923 struct reiserfs_journal *journal = SB_JOURNAL(th->t_super);
2924 BUG_ON(!th->t_trans_id);
2925 journal->j_must_wait = 1;
2926 set_bit(J_WRITERS_BLOCKED, &journal->j_state);
2927 return;
2930 /* this must be called without a transaction started, and does not
2931 ** require BKL
2933 void reiserfs_allow_writes(struct super_block *s)
2935 struct reiserfs_journal *journal = SB_JOURNAL(s);
2936 clear_bit(J_WRITERS_BLOCKED, &journal->j_state);
2937 wake_up(&journal->j_join_wait);
2940 /* this must be called without a transaction started, and does not
2941 ** require BKL
2943 void reiserfs_wait_on_write_block(struct super_block *s)
2945 struct reiserfs_journal *journal = SB_JOURNAL(s);
2946 wait_event(journal->j_join_wait,
2947 !test_bit(J_WRITERS_BLOCKED, &journal->j_state));
2950 static void queue_log_writer(struct super_block *s)
2952 wait_queue_t wait;
2953 struct reiserfs_journal *journal = SB_JOURNAL(s);
2954 set_bit(J_WRITERS_QUEUED, &journal->j_state);
2957 * we don't want to use wait_event here because
2958 * we only want to wait once.
2960 init_waitqueue_entry(&wait, current);
2961 add_wait_queue(&journal->j_join_wait, &wait);
2962 set_current_state(TASK_UNINTERRUPTIBLE);
2963 if (test_bit(J_WRITERS_QUEUED, &journal->j_state)) {
2964 reiserfs_write_unlock(s);
2965 schedule();
2966 reiserfs_write_lock(s);
2968 __set_current_state(TASK_RUNNING);
2969 remove_wait_queue(&journal->j_join_wait, &wait);
2972 static void wake_queued_writers(struct super_block *s)
2974 struct reiserfs_journal *journal = SB_JOURNAL(s);
2975 if (test_and_clear_bit(J_WRITERS_QUEUED, &journal->j_state))
2976 wake_up(&journal->j_join_wait);
2979 static void let_transaction_grow(struct super_block *sb, unsigned int trans_id)
2981 struct reiserfs_journal *journal = SB_JOURNAL(sb);
2982 unsigned long bcount = journal->j_bcount;
2983 while (1) {
2984 reiserfs_write_unlock(sb);
2985 schedule_timeout_uninterruptible(1);
2986 reiserfs_write_lock(sb);
2987 journal->j_current_jl->j_state |= LIST_COMMIT_PENDING;
2988 while ((atomic_read(&journal->j_wcount) > 0 ||
2989 atomic_read(&journal->j_jlock)) &&
2990 journal->j_trans_id == trans_id) {
2991 queue_log_writer(sb);
2993 if (journal->j_trans_id != trans_id)
2994 break;
2995 if (bcount == journal->j_bcount)
2996 break;
2997 bcount = journal->j_bcount;
3001 /* join == true if you must join an existing transaction.
3002 ** join == false if you can deal with waiting for others to finish
3004 ** this will block until the transaction is joinable. send the number of blocks you
3005 ** expect to use in nblocks.
3007 static int do_journal_begin_r(struct reiserfs_transaction_handle *th,
3008 struct super_block *sb, unsigned long nblocks,
3009 int join)
3011 time_t now = get_seconds();
3012 unsigned int old_trans_id;
3013 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3014 struct reiserfs_transaction_handle myth;
3015 int sched_count = 0;
3016 int retval;
3018 reiserfs_check_lock_depth(sb, "journal_begin");
3019 BUG_ON(nblocks > journal->j_trans_max);
3021 PROC_INFO_INC(sb, journal.journal_being);
3022 /* set here for journal_join */
3023 th->t_refcount = 1;
3024 th->t_super = sb;
3026 relock:
3027 lock_journal(sb);
3028 if (join != JBEGIN_ABORT && reiserfs_is_journal_aborted(journal)) {
3029 unlock_journal(sb);
3030 retval = journal->j_errno;
3031 goto out_fail;
3033 journal->j_bcount++;
3035 if (test_bit(J_WRITERS_BLOCKED, &journal->j_state)) {
3036 unlock_journal(sb);
3037 reiserfs_write_unlock(sb);
3038 reiserfs_wait_on_write_block(sb);
3039 reiserfs_write_lock(sb);
3040 PROC_INFO_INC(sb, journal.journal_relock_writers);
3041 goto relock;
3043 now = get_seconds();
3045 /* if there is no room in the journal OR
3046 ** if this transaction is too old, and we weren't called joinable, wait for it to finish before beginning
3047 ** we don't sleep if there aren't other writers
3050 if ((!join && journal->j_must_wait > 0) ||
3051 (!join
3052 && (journal->j_len_alloc + nblocks + 2) >= journal->j_max_batch)
3053 || (!join && atomic_read(&journal->j_wcount) > 0
3054 && journal->j_trans_start_time > 0
3055 && (now - journal->j_trans_start_time) >
3056 journal->j_max_trans_age) || (!join
3057 && atomic_read(&journal->j_jlock))
3058 || (!join && journal->j_cnode_free < (journal->j_trans_max * 3))) {
3060 old_trans_id = journal->j_trans_id;
3061 unlock_journal(sb); /* allow others to finish this transaction */
3063 if (!join && (journal->j_len_alloc + nblocks + 2) >=
3064 journal->j_max_batch &&
3065 ((journal->j_len + nblocks + 2) * 100) <
3066 (journal->j_len_alloc * 75)) {
3067 if (atomic_read(&journal->j_wcount) > 10) {
3068 sched_count++;
3069 queue_log_writer(sb);
3070 goto relock;
3073 /* don't mess with joining the transaction if all we have to do is
3074 * wait for someone else to do a commit
3076 if (atomic_read(&journal->j_jlock)) {
3077 while (journal->j_trans_id == old_trans_id &&
3078 atomic_read(&journal->j_jlock)) {
3079 queue_log_writer(sb);
3081 goto relock;
3083 retval = journal_join(&myth, sb, 1);
3084 if (retval)
3085 goto out_fail;
3087 /* someone might have ended the transaction while we joined */
3088 if (old_trans_id != journal->j_trans_id) {
3089 retval = do_journal_end(&myth, sb, 1, 0);
3090 } else {
3091 retval = do_journal_end(&myth, sb, 1, COMMIT_NOW);
3094 if (retval)
3095 goto out_fail;
3097 PROC_INFO_INC(sb, journal.journal_relock_wcount);
3098 goto relock;
3100 /* we are the first writer, set trans_id */
3101 if (journal->j_trans_start_time == 0) {
3102 journal->j_trans_start_time = get_seconds();
3104 atomic_inc(&(journal->j_wcount));
3105 journal->j_len_alloc += nblocks;
3106 th->t_blocks_logged = 0;
3107 th->t_blocks_allocated = nblocks;
3108 th->t_trans_id = journal->j_trans_id;
3109 unlock_journal(sb);
3110 INIT_LIST_HEAD(&th->t_list);
3111 get_fs_excl();
3112 return 0;
3114 out_fail:
3115 memset(th, 0, sizeof(*th));
3116 /* Re-set th->t_super, so we can properly keep track of how many
3117 * persistent transactions there are. We need to do this so if this
3118 * call is part of a failed restart_transaction, we can free it later */
3119 th->t_super = sb;
3120 return retval;
3123 struct reiserfs_transaction_handle *reiserfs_persistent_transaction(struct
3124 super_block
3126 int nblocks)
3128 int ret;
3129 struct reiserfs_transaction_handle *th;
3131 /* if we're nesting into an existing transaction. It will be
3132 ** persistent on its own
3134 if (reiserfs_transaction_running(s)) {
3135 th = current->journal_info;
3136 th->t_refcount++;
3137 BUG_ON(th->t_refcount < 2);
3139 return th;
3141 th = kmalloc(sizeof(struct reiserfs_transaction_handle), GFP_NOFS);
3142 if (!th)
3143 return NULL;
3144 ret = journal_begin(th, s, nblocks);
3145 if (ret) {
3146 kfree(th);
3147 return NULL;
3150 SB_JOURNAL(s)->j_persistent_trans++;
3151 return th;
3154 int reiserfs_end_persistent_transaction(struct reiserfs_transaction_handle *th)
3156 struct super_block *s = th->t_super;
3157 int ret = 0;
3158 if (th->t_trans_id)
3159 ret = journal_end(th, th->t_super, th->t_blocks_allocated);
3160 else
3161 ret = -EIO;
3162 if (th->t_refcount == 0) {
3163 SB_JOURNAL(s)->j_persistent_trans--;
3164 kfree(th);
3166 return ret;
3169 static int journal_join(struct reiserfs_transaction_handle *th,
3170 struct super_block *sb, unsigned long nblocks)
3172 struct reiserfs_transaction_handle *cur_th = current->journal_info;
3174 /* this keeps do_journal_end from NULLing out the current->journal_info
3175 ** pointer
3177 th->t_handle_save = cur_th;
3178 BUG_ON(cur_th && cur_th->t_refcount > 1);
3179 return do_journal_begin_r(th, sb, nblocks, JBEGIN_JOIN);
3182 int journal_join_abort(struct reiserfs_transaction_handle *th,
3183 struct super_block *sb, unsigned long nblocks)
3185 struct reiserfs_transaction_handle *cur_th = current->journal_info;
3187 /* this keeps do_journal_end from NULLing out the current->journal_info
3188 ** pointer
3190 th->t_handle_save = cur_th;
3191 BUG_ON(cur_th && cur_th->t_refcount > 1);
3192 return do_journal_begin_r(th, sb, nblocks, JBEGIN_ABORT);
3195 int journal_begin(struct reiserfs_transaction_handle *th,
3196 struct super_block *sb, unsigned long nblocks)
3198 struct reiserfs_transaction_handle *cur_th = current->journal_info;
3199 int ret;
3201 th->t_handle_save = NULL;
3202 if (cur_th) {
3203 /* we are nesting into the current transaction */
3204 if (cur_th->t_super == sb) {
3205 BUG_ON(!cur_th->t_refcount);
3206 cur_th->t_refcount++;
3207 memcpy(th, cur_th, sizeof(*th));
3208 if (th->t_refcount <= 1)
3209 reiserfs_warning(sb, "reiserfs-2005",
3210 "BAD: refcount <= 1, but "
3211 "journal_info != 0");
3212 return 0;
3213 } else {
3214 /* we've ended up with a handle from a different filesystem.
3215 ** save it and restore on journal_end. This should never
3216 ** really happen...
3218 reiserfs_warning(sb, "clm-2100",
3219 "nesting info a different FS");
3220 th->t_handle_save = current->journal_info;
3221 current->journal_info = th;
3223 } else {
3224 current->journal_info = th;
3226 ret = do_journal_begin_r(th, sb, nblocks, JBEGIN_REG);
3227 BUG_ON(current->journal_info != th);
3229 /* I guess this boils down to being the reciprocal of clm-2100 above.
3230 * If do_journal_begin_r fails, we need to put it back, since journal_end
3231 * won't be called to do it. */
3232 if (ret)
3233 current->journal_info = th->t_handle_save;
3234 else
3235 BUG_ON(!th->t_refcount);
3237 return ret;
3241 ** puts bh into the current transaction. If it was already there, reorders removes the
3242 ** old pointers from the hash, and puts new ones in (to make sure replay happen in the right order).
3244 ** if it was dirty, cleans and files onto the clean list. I can't let it be dirty again until the
3245 ** transaction is committed.
3247 ** if j_len, is bigger than j_len_alloc, it pushes j_len_alloc to 10 + j_len.
3249 int journal_mark_dirty(struct reiserfs_transaction_handle *th,
3250 struct super_block *sb, struct buffer_head *bh)
3252 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3253 struct reiserfs_journal_cnode *cn = NULL;
3254 int count_already_incd = 0;
3255 int prepared = 0;
3256 BUG_ON(!th->t_trans_id);
3258 PROC_INFO_INC(sb, journal.mark_dirty);
3259 if (th->t_trans_id != journal->j_trans_id) {
3260 reiserfs_panic(th->t_super, "journal-1577",
3261 "handle trans id %ld != current trans id %ld",
3262 th->t_trans_id, journal->j_trans_id);
3265 sb->s_dirt = 1;
3267 prepared = test_clear_buffer_journal_prepared(bh);
3268 clear_buffer_journal_restore_dirty(bh);
3269 /* already in this transaction, we are done */
3270 if (buffer_journaled(bh)) {
3271 PROC_INFO_INC(sb, journal.mark_dirty_already);
3272 return 0;
3275 /* this must be turned into a panic instead of a warning. We can't allow
3276 ** a dirty or journal_dirty or locked buffer to be logged, as some changes
3277 ** could get to disk too early. NOT GOOD.
3279 if (!prepared || buffer_dirty(bh)) {
3280 reiserfs_warning(sb, "journal-1777",
3281 "buffer %llu bad state "
3282 "%cPREPARED %cLOCKED %cDIRTY %cJDIRTY_WAIT",
3283 (unsigned long long)bh->b_blocknr,
3284 prepared ? ' ' : '!',
3285 buffer_locked(bh) ? ' ' : '!',
3286 buffer_dirty(bh) ? ' ' : '!',
3287 buffer_journal_dirty(bh) ? ' ' : '!');
3290 if (atomic_read(&(journal->j_wcount)) <= 0) {
3291 reiserfs_warning(sb, "journal-1409",
3292 "returning because j_wcount was %d",
3293 atomic_read(&(journal->j_wcount)));
3294 return 1;
3296 /* this error means I've screwed up, and we've overflowed the transaction.
3297 ** Nothing can be done here, except make the FS readonly or panic.
3299 if (journal->j_len >= journal->j_trans_max) {
3300 reiserfs_panic(th->t_super, "journal-1413",
3301 "j_len (%lu) is too big",
3302 journal->j_len);
3305 if (buffer_journal_dirty(bh)) {
3306 count_already_incd = 1;
3307 PROC_INFO_INC(sb, journal.mark_dirty_notjournal);
3308 clear_buffer_journal_dirty(bh);
3311 if (journal->j_len > journal->j_len_alloc) {
3312 journal->j_len_alloc = journal->j_len + JOURNAL_PER_BALANCE_CNT;
3315 set_buffer_journaled(bh);
3317 /* now put this guy on the end */
3318 if (!cn) {
3319 cn = get_cnode(sb);
3320 if (!cn) {
3321 reiserfs_panic(sb, "journal-4", "get_cnode failed!");
3324 if (th->t_blocks_logged == th->t_blocks_allocated) {
3325 th->t_blocks_allocated += JOURNAL_PER_BALANCE_CNT;
3326 journal->j_len_alloc += JOURNAL_PER_BALANCE_CNT;
3328 th->t_blocks_logged++;
3329 journal->j_len++;
3331 cn->bh = bh;
3332 cn->blocknr = bh->b_blocknr;
3333 cn->sb = sb;
3334 cn->jlist = NULL;
3335 insert_journal_hash(journal->j_hash_table, cn);
3336 if (!count_already_incd) {
3337 get_bh(bh);
3340 cn->next = NULL;
3341 cn->prev = journal->j_last;
3342 cn->bh = bh;
3343 if (journal->j_last) {
3344 journal->j_last->next = cn;
3345 journal->j_last = cn;
3346 } else {
3347 journal->j_first = cn;
3348 journal->j_last = cn;
3350 return 0;
3353 int journal_end(struct reiserfs_transaction_handle *th,
3354 struct super_block *sb, unsigned long nblocks)
3356 if (!current->journal_info && th->t_refcount > 1)
3357 reiserfs_warning(sb, "REISER-NESTING",
3358 "th NULL, refcount %d", th->t_refcount);
3360 if (!th->t_trans_id) {
3361 WARN_ON(1);
3362 return -EIO;
3365 th->t_refcount--;
3366 if (th->t_refcount > 0) {
3367 struct reiserfs_transaction_handle *cur_th =
3368 current->journal_info;
3370 /* we aren't allowed to close a nested transaction on a different
3371 ** filesystem from the one in the task struct
3373 BUG_ON(cur_th->t_super != th->t_super);
3375 if (th != cur_th) {
3376 memcpy(current->journal_info, th, sizeof(*th));
3377 th->t_trans_id = 0;
3379 return 0;
3380 } else {
3381 return do_journal_end(th, sb, nblocks, 0);
3385 /* removes from the current transaction, relsing and descrementing any counters.
3386 ** also files the removed buffer directly onto the clean list
3388 ** called by journal_mark_freed when a block has been deleted
3390 ** returns 1 if it cleaned and relsed the buffer. 0 otherwise
3392 static int remove_from_transaction(struct super_block *sb,
3393 b_blocknr_t blocknr, int already_cleaned)
3395 struct buffer_head *bh;
3396 struct reiserfs_journal_cnode *cn;
3397 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3398 int ret = 0;
3400 cn = get_journal_hash_dev(sb, journal->j_hash_table, blocknr);
3401 if (!cn || !cn->bh) {
3402 return ret;
3404 bh = cn->bh;
3405 if (cn->prev) {
3406 cn->prev->next = cn->next;
3408 if (cn->next) {
3409 cn->next->prev = cn->prev;
3411 if (cn == journal->j_first) {
3412 journal->j_first = cn->next;
3414 if (cn == journal->j_last) {
3415 journal->j_last = cn->prev;
3417 if (bh)
3418 remove_journal_hash(sb, journal->j_hash_table, NULL,
3419 bh->b_blocknr, 0);
3420 clear_buffer_journaled(bh); /* don't log this one */
3422 if (!already_cleaned) {
3423 clear_buffer_journal_dirty(bh);
3424 clear_buffer_dirty(bh);
3425 clear_buffer_journal_test(bh);
3426 put_bh(bh);
3427 if (atomic_read(&(bh->b_count)) < 0) {
3428 reiserfs_warning(sb, "journal-1752",
3429 "b_count < 0");
3431 ret = 1;
3433 journal->j_len--;
3434 journal->j_len_alloc--;
3435 free_cnode(sb, cn);
3436 return ret;
3440 ** for any cnode in a journal list, it can only be dirtied of all the
3441 ** transactions that include it are committed to disk.
3442 ** this checks through each transaction, and returns 1 if you are allowed to dirty,
3443 ** and 0 if you aren't
3445 ** it is called by dirty_journal_list, which is called after flush_commit_list has gotten all the log
3446 ** blocks for a given transaction on disk
3449 static int can_dirty(struct reiserfs_journal_cnode *cn)
3451 struct super_block *sb = cn->sb;
3452 b_blocknr_t blocknr = cn->blocknr;
3453 struct reiserfs_journal_cnode *cur = cn->hprev;
3454 int can_dirty = 1;
3456 /* first test hprev. These are all newer than cn, so any node here
3457 ** with the same block number and dev means this node can't be sent
3458 ** to disk right now.
3460 while (cur && can_dirty) {
3461 if (cur->jlist && cur->bh && cur->blocknr && cur->sb == sb &&
3462 cur->blocknr == blocknr) {
3463 can_dirty = 0;
3465 cur = cur->hprev;
3467 /* then test hnext. These are all older than cn. As long as they
3468 ** are committed to the log, it is safe to write cn to disk
3470 cur = cn->hnext;
3471 while (cur && can_dirty) {
3472 if (cur->jlist && cur->jlist->j_len > 0 &&
3473 atomic_read(&(cur->jlist->j_commit_left)) > 0 && cur->bh &&
3474 cur->blocknr && cur->sb == sb && cur->blocknr == blocknr) {
3475 can_dirty = 0;
3477 cur = cur->hnext;
3479 return can_dirty;
3482 /* syncs the commit blocks, but does not force the real buffers to disk
3483 ** will wait until the current transaction is done/committed before returning
3485 int journal_end_sync(struct reiserfs_transaction_handle *th,
3486 struct super_block *sb, unsigned long nblocks)
3488 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3490 BUG_ON(!th->t_trans_id);
3491 /* you can sync while nested, very, very bad */
3492 BUG_ON(th->t_refcount > 1);
3493 if (journal->j_len == 0) {
3494 reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
3496 journal_mark_dirty(th, sb, SB_BUFFER_WITH_SB(sb));
3498 return do_journal_end(th, sb, nblocks, COMMIT_NOW | WAIT);
3502 ** writeback the pending async commits to disk
3504 static void flush_async_commits(struct work_struct *work)
3506 struct reiserfs_journal *journal =
3507 container_of(work, struct reiserfs_journal, j_work.work);
3508 struct super_block *sb = journal->j_work_sb;
3509 struct reiserfs_journal_list *jl;
3510 struct list_head *entry;
3512 reiserfs_write_lock(sb);
3513 if (!list_empty(&journal->j_journal_list)) {
3514 /* last entry is the youngest, commit it and you get everything */
3515 entry = journal->j_journal_list.prev;
3516 jl = JOURNAL_LIST_ENTRY(entry);
3517 flush_commit_list(sb, jl, 1);
3519 reiserfs_write_unlock(sb);
3523 ** flushes any old transactions to disk
3524 ** ends the current transaction if it is too old
3526 int reiserfs_flush_old_commits(struct super_block *sb)
3528 time_t now;
3529 struct reiserfs_transaction_handle th;
3530 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3532 now = get_seconds();
3533 /* safety check so we don't flush while we are replaying the log during
3534 * mount
3536 if (list_empty(&journal->j_journal_list)) {
3537 return 0;
3540 /* check the current transaction. If there are no writers, and it is
3541 * too old, finish it, and force the commit blocks to disk
3543 if (atomic_read(&journal->j_wcount) <= 0 &&
3544 journal->j_trans_start_time > 0 &&
3545 journal->j_len > 0 &&
3546 (now - journal->j_trans_start_time) > journal->j_max_trans_age) {
3547 if (!journal_join(&th, sb, 1)) {
3548 reiserfs_prepare_for_journal(sb,
3549 SB_BUFFER_WITH_SB(sb),
3551 journal_mark_dirty(&th, sb,
3552 SB_BUFFER_WITH_SB(sb));
3554 /* we're only being called from kreiserfsd, it makes no sense to do
3555 ** an async commit so that kreiserfsd can do it later
3557 do_journal_end(&th, sb, 1, COMMIT_NOW | WAIT);
3560 return sb->s_dirt;
3564 ** returns 0 if do_journal_end should return right away, returns 1 if do_journal_end should finish the commit
3566 ** if the current transaction is too old, but still has writers, this will wait on j_join_wait until all
3567 ** the writers are done. By the time it wakes up, the transaction it was called has already ended, so it just
3568 ** flushes the commit list and returns 0.
3570 ** Won't batch when flush or commit_now is set. Also won't batch when others are waiting on j_join_wait.
3572 ** Note, we can't allow the journal_end to proceed while there are still writers in the log.
3574 static int check_journal_end(struct reiserfs_transaction_handle *th,
3575 struct super_block *sb, unsigned long nblocks,
3576 int flags)
3579 time_t now;
3580 int flush = flags & FLUSH_ALL;
3581 int commit_now = flags & COMMIT_NOW;
3582 int wait_on_commit = flags & WAIT;
3583 struct reiserfs_journal_list *jl;
3584 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3586 BUG_ON(!th->t_trans_id);
3588 if (th->t_trans_id != journal->j_trans_id) {
3589 reiserfs_panic(th->t_super, "journal-1577",
3590 "handle trans id %ld != current trans id %ld",
3591 th->t_trans_id, journal->j_trans_id);
3594 journal->j_len_alloc -= (th->t_blocks_allocated - th->t_blocks_logged);
3595 if (atomic_read(&(journal->j_wcount)) > 0) { /* <= 0 is allowed. unmounting might not call begin */
3596 atomic_dec(&(journal->j_wcount));
3599 /* BUG, deal with case where j_len is 0, but people previously freed blocks need to be released
3600 ** will be dealt with by next transaction that actually writes something, but should be taken
3601 ** care of in this trans
3603 BUG_ON(journal->j_len == 0);
3605 /* if wcount > 0, and we are called to with flush or commit_now,
3606 ** we wait on j_join_wait. We will wake up when the last writer has
3607 ** finished the transaction, and started it on its way to the disk.
3608 ** Then, we flush the commit or journal list, and just return 0
3609 ** because the rest of journal end was already done for this transaction.
3611 if (atomic_read(&(journal->j_wcount)) > 0) {
3612 if (flush || commit_now) {
3613 unsigned trans_id;
3615 jl = journal->j_current_jl;
3616 trans_id = jl->j_trans_id;
3617 if (wait_on_commit)
3618 jl->j_state |= LIST_COMMIT_PENDING;
3619 atomic_set(&(journal->j_jlock), 1);
3620 if (flush) {
3621 journal->j_next_full_flush = 1;
3623 unlock_journal(sb);
3625 /* sleep while the current transaction is still j_jlocked */
3626 while (journal->j_trans_id == trans_id) {
3627 if (atomic_read(&journal->j_jlock)) {
3628 queue_log_writer(sb);
3629 } else {
3630 lock_journal(sb);
3631 if (journal->j_trans_id == trans_id) {
3632 atomic_set(&(journal->j_jlock),
3635 unlock_journal(sb);
3638 BUG_ON(journal->j_trans_id == trans_id);
3640 if (commit_now
3641 && journal_list_still_alive(sb, trans_id)
3642 && wait_on_commit) {
3643 flush_commit_list(sb, jl, 1);
3645 return 0;
3647 unlock_journal(sb);
3648 return 0;
3651 /* deal with old transactions where we are the last writers */
3652 now = get_seconds();
3653 if ((now - journal->j_trans_start_time) > journal->j_max_trans_age) {
3654 commit_now = 1;
3655 journal->j_next_async_flush = 1;
3657 /* don't batch when someone is waiting on j_join_wait */
3658 /* don't batch when syncing the commit or flushing the whole trans */
3659 if (!(journal->j_must_wait > 0) && !(atomic_read(&(journal->j_jlock)))
3660 && !flush && !commit_now && (journal->j_len < journal->j_max_batch)
3661 && journal->j_len_alloc < journal->j_max_batch
3662 && journal->j_cnode_free > (journal->j_trans_max * 3)) {
3663 journal->j_bcount++;
3664 unlock_journal(sb);
3665 return 0;
3668 if (journal->j_start > SB_ONDISK_JOURNAL_SIZE(sb)) {
3669 reiserfs_panic(sb, "journal-003",
3670 "j_start (%ld) is too high",
3671 journal->j_start);
3673 return 1;
3677 ** Does all the work that makes deleting blocks safe.
3678 ** when deleting a block mark BH_JNew, just remove it from the current transaction, clean it's buffer_head and move on.
3680 ** otherwise:
3681 ** set a bit for the block in the journal bitmap. That will prevent it from being allocated for unformatted nodes
3682 ** before this transaction has finished.
3684 ** mark any cnodes for this block as BLOCK_FREED, and clear their bh pointers. That will prevent any old transactions with
3685 ** this block from trying to flush to the real location. Since we aren't removing the cnode from the journal_list_hash,
3686 ** the block can't be reallocated yet.
3688 ** Then remove it from the current transaction, decrementing any counters and filing it on the clean list.
3690 int journal_mark_freed(struct reiserfs_transaction_handle *th,
3691 struct super_block *sb, b_blocknr_t blocknr)
3693 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3694 struct reiserfs_journal_cnode *cn = NULL;
3695 struct buffer_head *bh = NULL;
3696 struct reiserfs_list_bitmap *jb = NULL;
3697 int cleaned = 0;
3698 BUG_ON(!th->t_trans_id);
3700 cn = get_journal_hash_dev(sb, journal->j_hash_table, blocknr);
3701 if (cn && cn->bh) {
3702 bh = cn->bh;
3703 get_bh(bh);
3705 /* if it is journal new, we just remove it from this transaction */
3706 if (bh && buffer_journal_new(bh)) {
3707 clear_buffer_journal_new(bh);
3708 clear_prepared_bits(bh);
3709 reiserfs_clean_and_file_buffer(bh);
3710 cleaned = remove_from_transaction(sb, blocknr, cleaned);
3711 } else {
3712 /* set the bit for this block in the journal bitmap for this transaction */
3713 jb = journal->j_current_jl->j_list_bitmap;
3714 if (!jb) {
3715 reiserfs_panic(sb, "journal-1702",
3716 "journal_list_bitmap is NULL");
3718 set_bit_in_list_bitmap(sb, blocknr, jb);
3720 /* Note, the entire while loop is not allowed to schedule. */
3722 if (bh) {
3723 clear_prepared_bits(bh);
3724 reiserfs_clean_and_file_buffer(bh);
3726 cleaned = remove_from_transaction(sb, blocknr, cleaned);
3728 /* find all older transactions with this block, make sure they don't try to write it out */
3729 cn = get_journal_hash_dev(sb, journal->j_list_hash_table,
3730 blocknr);
3731 while (cn) {
3732 if (sb == cn->sb && blocknr == cn->blocknr) {
3733 set_bit(BLOCK_FREED, &cn->state);
3734 if (cn->bh) {
3735 if (!cleaned) {
3736 /* remove_from_transaction will brelse the buffer if it was
3737 ** in the current trans
3739 clear_buffer_journal_dirty(cn->
3740 bh);
3741 clear_buffer_dirty(cn->bh);
3742 clear_buffer_journal_test(cn->
3743 bh);
3744 cleaned = 1;
3745 put_bh(cn->bh);
3746 if (atomic_read
3747 (&(cn->bh->b_count)) < 0) {
3748 reiserfs_warning(sb,
3749 "journal-2138",
3750 "cn->bh->b_count < 0");
3753 if (cn->jlist) { /* since we are clearing the bh, we MUST dec nonzerolen */
3754 atomic_dec(&
3755 (cn->jlist->
3756 j_nonzerolen));
3758 cn->bh = NULL;
3761 cn = cn->hnext;
3765 if (bh)
3766 release_buffer_page(bh); /* get_hash grabs the buffer */
3767 return 0;
3770 void reiserfs_update_inode_transaction(struct inode *inode)
3772 struct reiserfs_journal *journal = SB_JOURNAL(inode->i_sb);
3773 REISERFS_I(inode)->i_jl = journal->j_current_jl;
3774 REISERFS_I(inode)->i_trans_id = journal->j_trans_id;
3778 * returns -1 on error, 0 if no commits/barriers were done and 1
3779 * if a transaction was actually committed and the barrier was done
3781 static int __commit_trans_jl(struct inode *inode, unsigned long id,
3782 struct reiserfs_journal_list *jl)
3784 struct reiserfs_transaction_handle th;
3785 struct super_block *sb = inode->i_sb;
3786 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3787 int ret = 0;
3789 /* is it from the current transaction, or from an unknown transaction? */
3790 if (id == journal->j_trans_id) {
3791 jl = journal->j_current_jl;
3792 /* try to let other writers come in and grow this transaction */
3793 let_transaction_grow(sb, id);
3794 if (journal->j_trans_id != id) {
3795 goto flush_commit_only;
3798 ret = journal_begin(&th, sb, 1);
3799 if (ret)
3800 return ret;
3802 /* someone might have ended this transaction while we joined */
3803 if (journal->j_trans_id != id) {
3804 reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
3806 journal_mark_dirty(&th, sb, SB_BUFFER_WITH_SB(sb));
3807 ret = journal_end(&th, sb, 1);
3808 goto flush_commit_only;
3811 ret = journal_end_sync(&th, sb, 1);
3812 if (!ret)
3813 ret = 1;
3815 } else {
3816 /* this gets tricky, we have to make sure the journal list in
3817 * the inode still exists. We know the list is still around
3818 * if we've got a larger transaction id than the oldest list
3820 flush_commit_only:
3821 if (journal_list_still_alive(inode->i_sb, id)) {
3823 * we only set ret to 1 when we know for sure
3824 * the barrier hasn't been started yet on the commit
3825 * block.
3827 if (atomic_read(&jl->j_commit_left) > 1)
3828 ret = 1;
3829 flush_commit_list(sb, jl, 1);
3830 if (journal->j_errno)
3831 ret = journal->j_errno;
3834 /* otherwise the list is gone, and long since committed */
3835 return ret;
3838 int reiserfs_commit_for_inode(struct inode *inode)
3840 unsigned int id = REISERFS_I(inode)->i_trans_id;
3841 struct reiserfs_journal_list *jl = REISERFS_I(inode)->i_jl;
3843 /* for the whole inode, assume unset id means it was
3844 * changed in the current transaction. More conservative
3846 if (!id || !jl) {
3847 reiserfs_update_inode_transaction(inode);
3848 id = REISERFS_I(inode)->i_trans_id;
3849 /* jl will be updated in __commit_trans_jl */
3852 return __commit_trans_jl(inode, id, jl);
3855 void reiserfs_restore_prepared_buffer(struct super_block *sb,
3856 struct buffer_head *bh)
3858 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3859 PROC_INFO_INC(sb, journal.restore_prepared);
3860 if (!bh) {
3861 return;
3863 if (test_clear_buffer_journal_restore_dirty(bh) &&
3864 buffer_journal_dirty(bh)) {
3865 struct reiserfs_journal_cnode *cn;
3866 cn = get_journal_hash_dev(sb,
3867 journal->j_list_hash_table,
3868 bh->b_blocknr);
3869 if (cn && can_dirty(cn)) {
3870 set_buffer_journal_test(bh);
3871 mark_buffer_dirty(bh);
3874 clear_buffer_journal_prepared(bh);
3877 extern struct tree_balance *cur_tb;
3879 ** before we can change a metadata block, we have to make sure it won't
3880 ** be written to disk while we are altering it. So, we must:
3881 ** clean it
3882 ** wait on it.
3885 int reiserfs_prepare_for_journal(struct super_block *sb,
3886 struct buffer_head *bh, int wait)
3888 PROC_INFO_INC(sb, journal.prepare);
3890 if (!trylock_buffer(bh)) {
3891 if (!wait)
3892 return 0;
3893 lock_buffer(bh);
3895 set_buffer_journal_prepared(bh);
3896 if (test_clear_buffer_dirty(bh) && buffer_journal_dirty(bh)) {
3897 clear_buffer_journal_test(bh);
3898 set_buffer_journal_restore_dirty(bh);
3900 unlock_buffer(bh);
3901 return 1;
3904 static void flush_old_journal_lists(struct super_block *s)
3906 struct reiserfs_journal *journal = SB_JOURNAL(s);
3907 struct reiserfs_journal_list *jl;
3908 struct list_head *entry;
3909 time_t now = get_seconds();
3911 while (!list_empty(&journal->j_journal_list)) {
3912 entry = journal->j_journal_list.next;
3913 jl = JOURNAL_LIST_ENTRY(entry);
3914 /* this check should always be run, to send old lists to disk */
3915 if (jl->j_timestamp < (now - (JOURNAL_MAX_TRANS_AGE * 4)) &&
3916 atomic_read(&jl->j_commit_left) == 0 &&
3917 test_transaction(s, jl)) {
3918 flush_used_journal_lists(s, jl);
3919 } else {
3920 break;
3926 ** long and ugly. If flush, will not return until all commit
3927 ** blocks and all real buffers in the trans are on disk.
3928 ** If no_async, won't return until all commit blocks are on disk.
3930 ** keep reading, there are comments as you go along
3932 ** If the journal is aborted, we just clean up. Things like flushing
3933 ** journal lists, etc just won't happen.
3935 static int do_journal_end(struct reiserfs_transaction_handle *th,
3936 struct super_block *sb, unsigned long nblocks,
3937 int flags)
3939 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3940 struct reiserfs_journal_cnode *cn, *next, *jl_cn;
3941 struct reiserfs_journal_cnode *last_cn = NULL;
3942 struct reiserfs_journal_desc *desc;
3943 struct reiserfs_journal_commit *commit;
3944 struct buffer_head *c_bh; /* commit bh */
3945 struct buffer_head *d_bh; /* desc bh */
3946 int cur_write_start = 0; /* start index of current log write */
3947 int old_start;
3948 int i;
3949 int flush;
3950 int wait_on_commit;
3951 struct reiserfs_journal_list *jl, *temp_jl;
3952 struct list_head *entry, *safe;
3953 unsigned long jindex;
3954 unsigned int commit_trans_id;
3955 int trans_half;
3957 BUG_ON(th->t_refcount > 1);
3958 BUG_ON(!th->t_trans_id);
3960 /* protect flush_older_commits from doing mistakes if the
3961 transaction ID counter gets overflowed. */
3962 if (th->t_trans_id == ~0U)
3963 flags |= FLUSH_ALL | COMMIT_NOW | WAIT;
3964 flush = flags & FLUSH_ALL;
3965 wait_on_commit = flags & WAIT;
3967 put_fs_excl();
3968 current->journal_info = th->t_handle_save;
3969 reiserfs_check_lock_depth(sb, "journal end");
3970 if (journal->j_len == 0) {
3971 reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
3973 journal_mark_dirty(th, sb, SB_BUFFER_WITH_SB(sb));
3976 lock_journal(sb);
3977 if (journal->j_next_full_flush) {
3978 flags |= FLUSH_ALL;
3979 flush = 1;
3981 if (journal->j_next_async_flush) {
3982 flags |= COMMIT_NOW | WAIT;
3983 wait_on_commit = 1;
3986 /* check_journal_end locks the journal, and unlocks if it does not return 1
3987 ** it tells us if we should continue with the journal_end, or just return
3989 if (!check_journal_end(th, sb, nblocks, flags)) {
3990 sb->s_dirt = 1;
3991 wake_queued_writers(sb);
3992 reiserfs_async_progress_wait(sb);
3993 goto out;
3996 /* check_journal_end might set these, check again */
3997 if (journal->j_next_full_flush) {
3998 flush = 1;
4002 ** j must wait means we have to flush the log blocks, and the real blocks for
4003 ** this transaction
4005 if (journal->j_must_wait > 0) {
4006 flush = 1;
4008 #ifdef REISERFS_PREALLOCATE
4009 /* quota ops might need to nest, setup the journal_info pointer for them
4010 * and raise the refcount so that it is > 0. */
4011 current->journal_info = th;
4012 th->t_refcount++;
4013 reiserfs_discard_all_prealloc(th); /* it should not involve new blocks into
4014 * the transaction */
4015 th->t_refcount--;
4016 current->journal_info = th->t_handle_save;
4017 #endif
4019 /* setup description block */
4020 d_bh =
4021 journal_getblk(sb,
4022 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
4023 journal->j_start);
4024 set_buffer_uptodate(d_bh);
4025 desc = (struct reiserfs_journal_desc *)(d_bh)->b_data;
4026 memset(d_bh->b_data, 0, d_bh->b_size);
4027 memcpy(get_journal_desc_magic(d_bh), JOURNAL_DESC_MAGIC, 8);
4028 set_desc_trans_id(desc, journal->j_trans_id);
4030 /* setup commit block. Don't write (keep it clean too) this one until after everyone else is written */
4031 c_bh = journal_getblk(sb, SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
4032 ((journal->j_start + journal->j_len +
4033 1) % SB_ONDISK_JOURNAL_SIZE(sb)));
4034 commit = (struct reiserfs_journal_commit *)c_bh->b_data;
4035 memset(c_bh->b_data, 0, c_bh->b_size);
4036 set_commit_trans_id(commit, journal->j_trans_id);
4037 set_buffer_uptodate(c_bh);
4039 /* init this journal list */
4040 jl = journal->j_current_jl;
4042 /* we lock the commit before doing anything because
4043 * we want to make sure nobody tries to run flush_commit_list until
4044 * the new transaction is fully setup, and we've already flushed the
4045 * ordered bh list
4047 reiserfs_mutex_lock_safe(&jl->j_commit_mutex, sb);
4049 /* save the transaction id in case we need to commit it later */
4050 commit_trans_id = jl->j_trans_id;
4052 atomic_set(&jl->j_older_commits_done, 0);
4053 jl->j_trans_id = journal->j_trans_id;
4054 jl->j_timestamp = journal->j_trans_start_time;
4055 jl->j_commit_bh = c_bh;
4056 jl->j_start = journal->j_start;
4057 jl->j_len = journal->j_len;
4058 atomic_set(&jl->j_nonzerolen, journal->j_len);
4059 atomic_set(&jl->j_commit_left, journal->j_len + 2);
4060 jl->j_realblock = NULL;
4062 /* The ENTIRE FOR LOOP MUST not cause schedule to occur.
4063 ** for each real block, add it to the journal list hash,
4064 ** copy into real block index array in the commit or desc block
4066 trans_half = journal_trans_half(sb->s_blocksize);
4067 for (i = 0, cn = journal->j_first; cn; cn = cn->next, i++) {
4068 if (buffer_journaled(cn->bh)) {
4069 jl_cn = get_cnode(sb);
4070 if (!jl_cn) {
4071 reiserfs_panic(sb, "journal-1676",
4072 "get_cnode returned NULL");
4074 if (i == 0) {
4075 jl->j_realblock = jl_cn;
4077 jl_cn->prev = last_cn;
4078 jl_cn->next = NULL;
4079 if (last_cn) {
4080 last_cn->next = jl_cn;
4082 last_cn = jl_cn;
4083 /* make sure the block we are trying to log is not a block
4084 of journal or reserved area */
4086 if (is_block_in_log_or_reserved_area
4087 (sb, cn->bh->b_blocknr)) {
4088 reiserfs_panic(sb, "journal-2332",
4089 "Trying to log block %lu, "
4090 "which is a log block",
4091 cn->bh->b_blocknr);
4093 jl_cn->blocknr = cn->bh->b_blocknr;
4094 jl_cn->state = 0;
4095 jl_cn->sb = sb;
4096 jl_cn->bh = cn->bh;
4097 jl_cn->jlist = jl;
4098 insert_journal_hash(journal->j_list_hash_table, jl_cn);
4099 if (i < trans_half) {
4100 desc->j_realblock[i] =
4101 cpu_to_le32(cn->bh->b_blocknr);
4102 } else {
4103 commit->j_realblock[i - trans_half] =
4104 cpu_to_le32(cn->bh->b_blocknr);
4106 } else {
4107 i--;
4110 set_desc_trans_len(desc, journal->j_len);
4111 set_desc_mount_id(desc, journal->j_mount_id);
4112 set_desc_trans_id(desc, journal->j_trans_id);
4113 set_commit_trans_len(commit, journal->j_len);
4115 /* special check in case all buffers in the journal were marked for not logging */
4116 BUG_ON(journal->j_len == 0);
4118 /* we're about to dirty all the log blocks, mark the description block
4119 * dirty now too. Don't mark the commit block dirty until all the
4120 * others are on disk
4122 mark_buffer_dirty(d_bh);
4124 /* first data block is j_start + 1, so add one to cur_write_start wherever you use it */
4125 cur_write_start = journal->j_start;
4126 cn = journal->j_first;
4127 jindex = 1; /* start at one so we don't get the desc again */
4128 while (cn) {
4129 clear_buffer_journal_new(cn->bh);
4130 /* copy all the real blocks into log area. dirty log blocks */
4131 if (buffer_journaled(cn->bh)) {
4132 struct buffer_head *tmp_bh;
4133 char *addr;
4134 struct page *page;
4135 tmp_bh =
4136 journal_getblk(sb,
4137 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
4138 ((cur_write_start +
4139 jindex) %
4140 SB_ONDISK_JOURNAL_SIZE(sb)));
4141 set_buffer_uptodate(tmp_bh);
4142 page = cn->bh->b_page;
4143 addr = kmap(page);
4144 memcpy(tmp_bh->b_data,
4145 addr + offset_in_page(cn->bh->b_data),
4146 cn->bh->b_size);
4147 kunmap(page);
4148 mark_buffer_dirty(tmp_bh);
4149 jindex++;
4150 set_buffer_journal_dirty(cn->bh);
4151 clear_buffer_journaled(cn->bh);
4152 } else {
4153 /* JDirty cleared sometime during transaction. don't log this one */
4154 reiserfs_warning(sb, "journal-2048",
4155 "BAD, buffer in journal hash, "
4156 "but not JDirty!");
4157 brelse(cn->bh);
4159 next = cn->next;
4160 free_cnode(sb, cn);
4161 cn = next;
4162 reiserfs_write_unlock(sb);
4163 cond_resched();
4164 reiserfs_write_lock(sb);
4167 /* we are done with both the c_bh and d_bh, but
4168 ** c_bh must be written after all other commit blocks,
4169 ** so we dirty/relse c_bh in flush_commit_list, with commit_left <= 1.
4172 journal->j_current_jl = alloc_journal_list(sb);
4174 /* now it is safe to insert this transaction on the main list */
4175 list_add_tail(&jl->j_list, &journal->j_journal_list);
4176 list_add_tail(&jl->j_working_list, &journal->j_working_list);
4177 journal->j_num_work_lists++;
4179 /* reset journal values for the next transaction */
4180 old_start = journal->j_start;
4181 journal->j_start =
4182 (journal->j_start + journal->j_len +
4183 2) % SB_ONDISK_JOURNAL_SIZE(sb);
4184 atomic_set(&(journal->j_wcount), 0);
4185 journal->j_bcount = 0;
4186 journal->j_last = NULL;
4187 journal->j_first = NULL;
4188 journal->j_len = 0;
4189 journal->j_trans_start_time = 0;
4190 /* check for trans_id overflow */
4191 if (++journal->j_trans_id == 0)
4192 journal->j_trans_id = 10;
4193 journal->j_current_jl->j_trans_id = journal->j_trans_id;
4194 journal->j_must_wait = 0;
4195 journal->j_len_alloc = 0;
4196 journal->j_next_full_flush = 0;
4197 journal->j_next_async_flush = 0;
4198 init_journal_hash(sb);
4200 // make sure reiserfs_add_jh sees the new current_jl before we
4201 // write out the tails
4202 smp_mb();
4204 /* tail conversion targets have to hit the disk before we end the
4205 * transaction. Otherwise a later transaction might repack the tail
4206 * before this transaction commits, leaving the data block unflushed and
4207 * clean, if we crash before the later transaction commits, the data block
4208 * is lost.
4210 if (!list_empty(&jl->j_tail_bh_list)) {
4211 reiserfs_write_unlock(sb);
4212 write_ordered_buffers(&journal->j_dirty_buffers_lock,
4213 journal, jl, &jl->j_tail_bh_list);
4214 reiserfs_write_lock(sb);
4216 BUG_ON(!list_empty(&jl->j_tail_bh_list));
4217 mutex_unlock(&jl->j_commit_mutex);
4219 /* honor the flush wishes from the caller, simple commits can
4220 ** be done outside the journal lock, they are done below
4222 ** if we don't flush the commit list right now, we put it into
4223 ** the work queue so the people waiting on the async progress work
4224 ** queue don't wait for this proc to flush journal lists and such.
4226 if (flush) {
4227 flush_commit_list(sb, jl, 1);
4228 flush_journal_list(sb, jl, 1);
4229 } else if (!(jl->j_state & LIST_COMMIT_PENDING))
4230 queue_delayed_work(commit_wq, &journal->j_work, HZ / 10);
4232 /* if the next transaction has any chance of wrapping, flush
4233 ** transactions that might get overwritten. If any journal lists are very
4234 ** old flush them as well.
4236 first_jl:
4237 list_for_each_safe(entry, safe, &journal->j_journal_list) {
4238 temp_jl = JOURNAL_LIST_ENTRY(entry);
4239 if (journal->j_start <= temp_jl->j_start) {
4240 if ((journal->j_start + journal->j_trans_max + 1) >=
4241 temp_jl->j_start) {
4242 flush_used_journal_lists(sb, temp_jl);
4243 goto first_jl;
4244 } else if ((journal->j_start +
4245 journal->j_trans_max + 1) <
4246 SB_ONDISK_JOURNAL_SIZE(sb)) {
4247 /* if we don't cross into the next transaction and we don't
4248 * wrap, there is no way we can overlap any later transactions
4249 * break now
4251 break;
4253 } else if ((journal->j_start +
4254 journal->j_trans_max + 1) >
4255 SB_ONDISK_JOURNAL_SIZE(sb)) {
4256 if (((journal->j_start + journal->j_trans_max + 1) %
4257 SB_ONDISK_JOURNAL_SIZE(sb)) >=
4258 temp_jl->j_start) {
4259 flush_used_journal_lists(sb, temp_jl);
4260 goto first_jl;
4261 } else {
4262 /* we don't overlap anything from out start to the end of the
4263 * log, and our wrapped portion doesn't overlap anything at
4264 * the start of the log. We can break
4266 break;
4270 flush_old_journal_lists(sb);
4272 journal->j_current_jl->j_list_bitmap =
4273 get_list_bitmap(sb, journal->j_current_jl);
4275 if (!(journal->j_current_jl->j_list_bitmap)) {
4276 reiserfs_panic(sb, "journal-1996",
4277 "could not get a list bitmap");
4280 atomic_set(&(journal->j_jlock), 0);
4281 unlock_journal(sb);
4282 /* wake up any body waiting to join. */
4283 clear_bit(J_WRITERS_QUEUED, &journal->j_state);
4284 wake_up(&(journal->j_join_wait));
4286 if (!flush && wait_on_commit &&
4287 journal_list_still_alive(sb, commit_trans_id)) {
4288 flush_commit_list(sb, jl, 1);
4290 out:
4291 reiserfs_check_lock_depth(sb, "journal end2");
4293 memset(th, 0, sizeof(*th));
4294 /* Re-set th->t_super, so we can properly keep track of how many
4295 * persistent transactions there are. We need to do this so if this
4296 * call is part of a failed restart_transaction, we can free it later */
4297 th->t_super = sb;
4299 return journal->j_errno;
4302 /* Send the file system read only and refuse new transactions */
4303 void reiserfs_abort_journal(struct super_block *sb, int errno)
4305 struct reiserfs_journal *journal = SB_JOURNAL(sb);
4306 if (test_bit(J_ABORTED, &journal->j_state))
4307 return;
4309 if (!journal->j_errno)
4310 journal->j_errno = errno;
4312 sb->s_flags |= MS_RDONLY;
4313 set_bit(J_ABORTED, &journal->j_state);
4315 #ifdef CONFIG_REISERFS_CHECK
4316 dump_stack();
4317 #endif