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Merge branch 'akpm' (Andrew's patch-bomb)
[mirror_ubuntu-artful-kernel.git] / fs / reiserfs / journal.c
1 /*
2 ** Write ahead logging implementation copyright Chris Mason 2000
3 **
4 ** The background commits make this code very interrelated, 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.
13 **
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.
18 **
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.
23 **
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.
28 **
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
35 */
36
37 #include <linux/time.h>
38 #include <linux/semaphore.h>
39 #include <linux/vmalloc.h>
40 #include "reiserfs.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>
53
54
55 /* gets a struct reiserfs_journal_list * from a list head */
56 #define JOURNAL_LIST_ENTRY(h) (list_entry((h), struct reiserfs_journal_list, \
57 j_list))
58 #define JOURNAL_WORK_ENTRY(h) (list_entry((h), struct reiserfs_journal_list, \
59 j_working_list))
60
61 /* the number of mounted filesystems. This is used to decide when to
62 ** start and kill the commit workqueue
63 */
64 static int reiserfs_mounted_fs_count;
65
66 static struct workqueue_struct *commit_wq;
67
68 #define JOURNAL_TRANS_HALF 1018 /* must be correct to keep the desc and commit
69 structs at 4k */
70 #define BUFNR 64 /*read ahead */
71
72 /* cnode stat bits. Move these into reiserfs_fs.h */
73
74 #define BLOCK_FREED 2 /* this block was freed, and can't be written. */
75 #define BLOCK_FREED_HOLDER 3 /* this block was freed during this transaction, and can't be written */
76
77 #define BLOCK_NEEDS_FLUSH 4 /* used in flush_journal_list */
78 #define BLOCK_DIRTIED 5
79
80 /* journal list state bits */
81 #define LIST_TOUCHED 1
82 #define LIST_DIRTY 2
83 #define LIST_COMMIT_PENDING 4 /* someone will commit this list */
84
85 /* flags for do_journal_end */
86 #define FLUSH_ALL 1 /* flush commit and real blocks */
87 #define COMMIT_NOW 2 /* end and commit this transaction */
88 #define WAIT 4 /* wait for the log blocks to hit the disk */
89
90 static int do_journal_end(struct reiserfs_transaction_handle *,
91 struct super_block *, unsigned long nblocks,
92 int flags);
93 static int flush_journal_list(struct super_block *s,
94 struct reiserfs_journal_list *jl, int flushall);
95 static int flush_commit_list(struct super_block *s,
96 struct reiserfs_journal_list *jl, int flushall);
97 static int can_dirty(struct reiserfs_journal_cnode *cn);
98 static int journal_join(struct reiserfs_transaction_handle *th,
99 struct super_block *sb, unsigned long nblocks);
100 static int release_journal_dev(struct super_block *super,
101 struct reiserfs_journal *journal);
102 static int dirty_one_transaction(struct super_block *s,
103 struct reiserfs_journal_list *jl);
104 static void flush_async_commits(struct work_struct *work);
105 static void queue_log_writer(struct super_block *s);
106
107 /* values for join in do_journal_begin_r */
108 enum {
109 JBEGIN_REG = 0, /* regular journal begin */
110 JBEGIN_JOIN = 1, /* join the running transaction if at all possible */
111 JBEGIN_ABORT = 2, /* called from cleanup code, ignores aborted flag */
112 };
113
114 static int do_journal_begin_r(struct reiserfs_transaction_handle *th,
115 struct super_block *sb,
116 unsigned long nblocks, int join);
117
118 static void init_journal_hash(struct super_block *sb)
119 {
120 struct reiserfs_journal *journal = SB_JOURNAL(sb);
121 memset(journal->j_hash_table, 0,
122 JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *));
123 }
124
125 /*
126 ** clears BH_Dirty and sticks the buffer on the clean list. Called because I can't allow refile_buffer to
127 ** make schedule happen after I've freed a block. Look at remove_from_transaction and journal_mark_freed for
128 ** more details.
129 */
130 static int reiserfs_clean_and_file_buffer(struct buffer_head *bh)
131 {
132 if (bh) {
133 clear_buffer_dirty(bh);
134 clear_buffer_journal_test(bh);
135 }
136 return 0;
137 }
138
139 static struct reiserfs_bitmap_node *allocate_bitmap_node(struct super_block
140 *sb)
141 {
142 struct reiserfs_bitmap_node *bn;
143 static int id;
144
145 bn = kmalloc(sizeof(struct reiserfs_bitmap_node), GFP_NOFS);
146 if (!bn) {
147 return NULL;
148 }
149 bn->data = kzalloc(sb->s_blocksize, GFP_NOFS);
150 if (!bn->data) {
151 kfree(bn);
152 return NULL;
153 }
154 bn->id = id++;
155 INIT_LIST_HEAD(&bn->list);
156 return bn;
157 }
158
159 static struct reiserfs_bitmap_node *get_bitmap_node(struct super_block *sb)
160 {
161 struct reiserfs_journal *journal = SB_JOURNAL(sb);
162 struct reiserfs_bitmap_node *bn = NULL;
163 struct list_head *entry = journal->j_bitmap_nodes.next;
164
165 journal->j_used_bitmap_nodes++;
166 repeat:
167
168 if (entry != &journal->j_bitmap_nodes) {
169 bn = list_entry(entry, struct reiserfs_bitmap_node, list);
170 list_del(entry);
171 memset(bn->data, 0, sb->s_blocksize);
172 journal->j_free_bitmap_nodes--;
173 return bn;
174 }
175 bn = allocate_bitmap_node(sb);
176 if (!bn) {
177 yield();
178 goto repeat;
179 }
180 return bn;
181 }
182 static inline void free_bitmap_node(struct super_block *sb,
183 struct reiserfs_bitmap_node *bn)
184 {
185 struct reiserfs_journal *journal = SB_JOURNAL(sb);
186 journal->j_used_bitmap_nodes--;
187 if (journal->j_free_bitmap_nodes > REISERFS_MAX_BITMAP_NODES) {
188 kfree(bn->data);
189 kfree(bn);
190 } else {
191 list_add(&bn->list, &journal->j_bitmap_nodes);
192 journal->j_free_bitmap_nodes++;
193 }
194 }
195
196 static void allocate_bitmap_nodes(struct super_block *sb)
197 {
198 int i;
199 struct reiserfs_journal *journal = SB_JOURNAL(sb);
200 struct reiserfs_bitmap_node *bn = NULL;
201 for (i = 0; i < REISERFS_MIN_BITMAP_NODES; i++) {
202 bn = allocate_bitmap_node(sb);
203 if (bn) {
204 list_add(&bn->list, &journal->j_bitmap_nodes);
205 journal->j_free_bitmap_nodes++;
206 } else {
207 break; /* this is ok, we'll try again when more are needed */
208 }
209 }
210 }
211
212 static int set_bit_in_list_bitmap(struct super_block *sb,
213 b_blocknr_t block,
214 struct reiserfs_list_bitmap *jb)
215 {
216 unsigned int bmap_nr = block / (sb->s_blocksize << 3);
217 unsigned int bit_nr = block % (sb->s_blocksize << 3);
218
219 if (!jb->bitmaps[bmap_nr]) {
220 jb->bitmaps[bmap_nr] = get_bitmap_node(sb);
221 }
222 set_bit(bit_nr, (unsigned long *)jb->bitmaps[bmap_nr]->data);
223 return 0;
224 }
225
226 static void cleanup_bitmap_list(struct super_block *sb,
227 struct reiserfs_list_bitmap *jb)
228 {
229 int i;
230 if (jb->bitmaps == NULL)
231 return;
232
233 for (i = 0; i < reiserfs_bmap_count(sb); i++) {
234 if (jb->bitmaps[i]) {
235 free_bitmap_node(sb, jb->bitmaps[i]);
236 jb->bitmaps[i] = NULL;
237 }
238 }
239 }
240
241 /*
242 ** only call this on FS unmount.
243 */
244 static int free_list_bitmaps(struct super_block *sb,
245 struct reiserfs_list_bitmap *jb_array)
246 {
247 int i;
248 struct reiserfs_list_bitmap *jb;
249 for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
250 jb = jb_array + i;
251 jb->journal_list = NULL;
252 cleanup_bitmap_list(sb, jb);
253 vfree(jb->bitmaps);
254 jb->bitmaps = NULL;
255 }
256 return 0;
257 }
258
259 static int free_bitmap_nodes(struct super_block *sb)
260 {
261 struct reiserfs_journal *journal = SB_JOURNAL(sb);
262 struct list_head *next = journal->j_bitmap_nodes.next;
263 struct reiserfs_bitmap_node *bn;
264
265 while (next != &journal->j_bitmap_nodes) {
266 bn = list_entry(next, struct reiserfs_bitmap_node, list);
267 list_del(next);
268 kfree(bn->data);
269 kfree(bn);
270 next = journal->j_bitmap_nodes.next;
271 journal->j_free_bitmap_nodes--;
272 }
273
274 return 0;
275 }
276
277 /*
278 ** get memory for JOURNAL_NUM_BITMAPS worth of bitmaps.
279 ** jb_array is the array to be filled in.
280 */
281 int reiserfs_allocate_list_bitmaps(struct super_block *sb,
282 struct reiserfs_list_bitmap *jb_array,
283 unsigned int bmap_nr)
284 {
285 int i;
286 int failed = 0;
287 struct reiserfs_list_bitmap *jb;
288 int mem = bmap_nr * sizeof(struct reiserfs_bitmap_node *);
289
290 for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
291 jb = jb_array + i;
292 jb->journal_list = NULL;
293 jb->bitmaps = vzalloc(mem);
294 if (!jb->bitmaps) {
295 reiserfs_warning(sb, "clm-2000", "unable to "
296 "allocate bitmaps for journal lists");
297 failed = 1;
298 break;
299 }
300 }
301 if (failed) {
302 free_list_bitmaps(sb, jb_array);
303 return -1;
304 }
305 return 0;
306 }
307
308 /*
309 ** find an available list bitmap. If you can't find one, flush a commit list
310 ** and try again
311 */
312 static struct reiserfs_list_bitmap *get_list_bitmap(struct super_block *sb,
313 struct reiserfs_journal_list
314 *jl)
315 {
316 int i, j;
317 struct reiserfs_journal *journal = SB_JOURNAL(sb);
318 struct reiserfs_list_bitmap *jb = NULL;
319
320 for (j = 0; j < (JOURNAL_NUM_BITMAPS * 3); j++) {
321 i = journal->j_list_bitmap_index;
322 journal->j_list_bitmap_index = (i + 1) % JOURNAL_NUM_BITMAPS;
323 jb = journal->j_list_bitmap + i;
324 if (journal->j_list_bitmap[i].journal_list) {
325 flush_commit_list(sb,
326 journal->j_list_bitmap[i].
327 journal_list, 1);
328 if (!journal->j_list_bitmap[i].journal_list) {
329 break;
330 }
331 } else {
332 break;
333 }
334 }
335 if (jb->journal_list) { /* double check to make sure if flushed correctly */
336 return NULL;
337 }
338 jb->journal_list = jl;
339 return jb;
340 }
341
342 /*
343 ** allocates a new chunk of X nodes, and links them all together as a list.
344 ** Uses the cnode->next and cnode->prev pointers
345 ** returns NULL on failure
346 */
347 static struct reiserfs_journal_cnode *allocate_cnodes(int num_cnodes)
348 {
349 struct reiserfs_journal_cnode *head;
350 int i;
351 if (num_cnodes <= 0) {
352 return NULL;
353 }
354 head = vzalloc(num_cnodes * sizeof(struct reiserfs_journal_cnode));
355 if (!head) {
356 return NULL;
357 }
358 head[0].prev = NULL;
359 head[0].next = head + 1;
360 for (i = 1; i < num_cnodes; i++) {
361 head[i].prev = head + (i - 1);
362 head[i].next = head + (i + 1); /* if last one, overwrite it after the if */
363 }
364 head[num_cnodes - 1].next = NULL;
365 return head;
366 }
367
368 /*
369 ** pulls a cnode off the free list, or returns NULL on failure
370 */
371 static struct reiserfs_journal_cnode *get_cnode(struct super_block *sb)
372 {
373 struct reiserfs_journal_cnode *cn;
374 struct reiserfs_journal *journal = SB_JOURNAL(sb);
375
376 reiserfs_check_lock_depth(sb, "get_cnode");
377
378 if (journal->j_cnode_free <= 0) {
379 return NULL;
380 }
381 journal->j_cnode_used++;
382 journal->j_cnode_free--;
383 cn = journal->j_cnode_free_list;
384 if (!cn) {
385 return cn;
386 }
387 if (cn->next) {
388 cn->next->prev = NULL;
389 }
390 journal->j_cnode_free_list = cn->next;
391 memset(cn, 0, sizeof(struct reiserfs_journal_cnode));
392 return cn;
393 }
394
395 /*
396 ** returns a cnode to the free list
397 */
398 static void free_cnode(struct super_block *sb,
399 struct reiserfs_journal_cnode *cn)
400 {
401 struct reiserfs_journal *journal = SB_JOURNAL(sb);
402
403 reiserfs_check_lock_depth(sb, "free_cnode");
404
405 journal->j_cnode_used--;
406 journal->j_cnode_free++;
407 /* memset(cn, 0, sizeof(struct reiserfs_journal_cnode)) ; */
408 cn->next = journal->j_cnode_free_list;
409 if (journal->j_cnode_free_list) {
410 journal->j_cnode_free_list->prev = cn;
411 }
412 cn->prev = NULL; /* not needed with the memset, but I might kill the memset, and forget to do this */
413 journal->j_cnode_free_list = cn;
414 }
415
416 static void clear_prepared_bits(struct buffer_head *bh)
417 {
418 clear_buffer_journal_prepared(bh);
419 clear_buffer_journal_restore_dirty(bh);
420 }
421
422 /* return a cnode with same dev, block number and size in table, or null if not found */
423 static inline struct reiserfs_journal_cnode *get_journal_hash_dev(struct
424 super_block
425 *sb,
426 struct
427 reiserfs_journal_cnode
428 **table,
429 long bl)
430 {
431 struct reiserfs_journal_cnode *cn;
432 cn = journal_hash(table, sb, bl);
433 while (cn) {
434 if (cn->blocknr == bl && cn->sb == sb)
435 return cn;
436 cn = cn->hnext;
437 }
438 return (struct reiserfs_journal_cnode *)0;
439 }
440
441 /*
442 ** this actually means 'can this block be reallocated yet?'. If you set search_all, a block can only be allocated
443 ** if it is not in the current transaction, was not freed by the current transaction, and has no chance of ever
444 ** being overwritten by a replay after crashing.
445 **
446 ** If you don't set search_all, a block can only be allocated if it is not in the current transaction. Since deleting
447 ** a block removes it from the current transaction, this case should never happen. If you don't set search_all, make
448 ** sure you never write the block without logging it.
449 **
450 ** next_zero_bit is a suggestion about the next block to try for find_forward.
451 ** when bl is rejected because it is set in a journal list bitmap, we search
452 ** for the next zero bit in the bitmap that rejected bl. Then, we return that
453 ** through next_zero_bit for find_forward to try.
454 **
455 ** Just because we return something in next_zero_bit does not mean we won't
456 ** reject it on the next call to reiserfs_in_journal
457 **
458 */
459 int reiserfs_in_journal(struct super_block *sb,
460 unsigned int bmap_nr, int bit_nr, int search_all,
461 b_blocknr_t * next_zero_bit)
462 {
463 struct reiserfs_journal *journal = SB_JOURNAL(sb);
464 struct reiserfs_journal_cnode *cn;
465 struct reiserfs_list_bitmap *jb;
466 int i;
467 unsigned long bl;
468
469 *next_zero_bit = 0; /* always start this at zero. */
470
471 PROC_INFO_INC(sb, journal.in_journal);
472 /* If we aren't doing a search_all, this is a metablock, and it will be logged before use.
473 ** if we crash before the transaction that freed it commits, this transaction won't
474 ** have committed either, and the block will never be written
475 */
476 if (search_all) {
477 for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
478 PROC_INFO_INC(sb, journal.in_journal_bitmap);
479 jb = journal->j_list_bitmap + i;
480 if (jb->journal_list && jb->bitmaps[bmap_nr] &&
481 test_bit(bit_nr,
482 (unsigned long *)jb->bitmaps[bmap_nr]->
483 data)) {
484 *next_zero_bit =
485 find_next_zero_bit((unsigned long *)
486 (jb->bitmaps[bmap_nr]->
487 data),
488 sb->s_blocksize << 3,
489 bit_nr + 1);
490 return 1;
491 }
492 }
493 }
494
495 bl = bmap_nr * (sb->s_blocksize << 3) + bit_nr;
496 /* is it in any old transactions? */
497 if (search_all
498 && (cn =
499 get_journal_hash_dev(sb, journal->j_list_hash_table, bl))) {
500 return 1;
501 }
502
503 /* is it in the current transaction. This should never happen */
504 if ((cn = get_journal_hash_dev(sb, journal->j_hash_table, bl))) {
505 BUG();
506 return 1;
507 }
508
509 PROC_INFO_INC(sb, journal.in_journal_reusable);
510 /* safe for reuse */
511 return 0;
512 }
513
514 /* insert cn into table
515 */
516 static inline void insert_journal_hash(struct reiserfs_journal_cnode **table,
517 struct reiserfs_journal_cnode *cn)
518 {
519 struct reiserfs_journal_cnode *cn_orig;
520
521 cn_orig = journal_hash(table, cn->sb, cn->blocknr);
522 cn->hnext = cn_orig;
523 cn->hprev = NULL;
524 if (cn_orig) {
525 cn_orig->hprev = cn;
526 }
527 journal_hash(table, cn->sb, cn->blocknr) = cn;
528 }
529
530 /* lock the current transaction */
531 static inline void lock_journal(struct super_block *sb)
532 {
533 PROC_INFO_INC(sb, journal.lock_journal);
534
535 reiserfs_mutex_lock_safe(&SB_JOURNAL(sb)->j_mutex, sb);
536 }
537
538 /* unlock the current transaction */
539 static inline void unlock_journal(struct super_block *sb)
540 {
541 mutex_unlock(&SB_JOURNAL(sb)->j_mutex);
542 }
543
544 static inline void get_journal_list(struct reiserfs_journal_list *jl)
545 {
546 jl->j_refcount++;
547 }
548
549 static inline void put_journal_list(struct super_block *s,
550 struct reiserfs_journal_list *jl)
551 {
552 if (jl->j_refcount < 1) {
553 reiserfs_panic(s, "journal-2", "trans id %u, refcount at %d",
554 jl->j_trans_id, jl->j_refcount);
555 }
556 if (--jl->j_refcount == 0)
557 kfree(jl);
558 }
559
560 /*
561 ** this used to be much more involved, and I'm keeping it just in case things get ugly again.
562 ** it gets called by flush_commit_list, and cleans up any data stored about blocks freed during a
563 ** transaction.
564 */
565 static void cleanup_freed_for_journal_list(struct super_block *sb,
566 struct reiserfs_journal_list *jl)
567 {
568
569 struct reiserfs_list_bitmap *jb = jl->j_list_bitmap;
570 if (jb) {
571 cleanup_bitmap_list(sb, jb);
572 }
573 jl->j_list_bitmap->journal_list = NULL;
574 jl->j_list_bitmap = NULL;
575 }
576
577 static int journal_list_still_alive(struct super_block *s,
578 unsigned int trans_id)
579 {
580 struct reiserfs_journal *journal = SB_JOURNAL(s);
581 struct list_head *entry = &journal->j_journal_list;
582 struct reiserfs_journal_list *jl;
583
584 if (!list_empty(entry)) {
585 jl = JOURNAL_LIST_ENTRY(entry->next);
586 if (jl->j_trans_id <= trans_id) {
587 return 1;
588 }
589 }
590 return 0;
591 }
592
593 /*
594 * If page->mapping was null, we failed to truncate this page for
595 * some reason. Most likely because it was truncated after being
596 * logged via data=journal.
597 *
598 * This does a check to see if the buffer belongs to one of these
599 * lost pages before doing the final put_bh. If page->mapping was
600 * null, it tries to free buffers on the page, which should make the
601 * final page_cache_release drop the page from the lru.
602 */
603 static void release_buffer_page(struct buffer_head *bh)
604 {
605 struct page *page = bh->b_page;
606 if (!page->mapping && trylock_page(page)) {
607 page_cache_get(page);
608 put_bh(bh);
609 if (!page->mapping)
610 try_to_free_buffers(page);
611 unlock_page(page);
612 page_cache_release(page);
613 } else {
614 put_bh(bh);
615 }
616 }
617
618 static void reiserfs_end_buffer_io_sync(struct buffer_head *bh, int uptodate)
619 {
620 char b[BDEVNAME_SIZE];
621
622 if (buffer_journaled(bh)) {
623 reiserfs_warning(NULL, "clm-2084",
624 "pinned buffer %lu:%s sent to disk",
625 bh->b_blocknr, bdevname(bh->b_bdev, b));
626 }
627 if (uptodate)
628 set_buffer_uptodate(bh);
629 else
630 clear_buffer_uptodate(bh);
631
632 unlock_buffer(bh);
633 release_buffer_page(bh);
634 }
635
636 static void reiserfs_end_ordered_io(struct buffer_head *bh, int uptodate)
637 {
638 if (uptodate)
639 set_buffer_uptodate(bh);
640 else
641 clear_buffer_uptodate(bh);
642 unlock_buffer(bh);
643 put_bh(bh);
644 }
645
646 static void submit_logged_buffer(struct buffer_head *bh)
647 {
648 get_bh(bh);
649 bh->b_end_io = reiserfs_end_buffer_io_sync;
650 clear_buffer_journal_new(bh);
651 clear_buffer_dirty(bh);
652 if (!test_clear_buffer_journal_test(bh))
653 BUG();
654 if (!buffer_uptodate(bh))
655 BUG();
656 submit_bh(WRITE, bh);
657 }
658
659 static void submit_ordered_buffer(struct buffer_head *bh)
660 {
661 get_bh(bh);
662 bh->b_end_io = reiserfs_end_ordered_io;
663 clear_buffer_dirty(bh);
664 if (!buffer_uptodate(bh))
665 BUG();
666 submit_bh(WRITE, bh);
667 }
668
669 #define CHUNK_SIZE 32
670 struct buffer_chunk {
671 struct buffer_head *bh[CHUNK_SIZE];
672 int nr;
673 };
674
675 static void write_chunk(struct buffer_chunk *chunk)
676 {
677 int i;
678 for (i = 0; i < chunk->nr; i++) {
679 submit_logged_buffer(chunk->bh[i]);
680 }
681 chunk->nr = 0;
682 }
683
684 static void write_ordered_chunk(struct buffer_chunk *chunk)
685 {
686 int i;
687 for (i = 0; i < chunk->nr; i++) {
688 submit_ordered_buffer(chunk->bh[i]);
689 }
690 chunk->nr = 0;
691 }
692
693 static int add_to_chunk(struct buffer_chunk *chunk, struct buffer_head *bh,
694 spinlock_t * lock, void (fn) (struct buffer_chunk *))
695 {
696 int ret = 0;
697 BUG_ON(chunk->nr >= CHUNK_SIZE);
698 chunk->bh[chunk->nr++] = bh;
699 if (chunk->nr >= CHUNK_SIZE) {
700 ret = 1;
701 if (lock)
702 spin_unlock(lock);
703 fn(chunk);
704 if (lock)
705 spin_lock(lock);
706 }
707 return ret;
708 }
709
710 static atomic_t nr_reiserfs_jh = ATOMIC_INIT(0);
711 static struct reiserfs_jh *alloc_jh(void)
712 {
713 struct reiserfs_jh *jh;
714 while (1) {
715 jh = kmalloc(sizeof(*jh), GFP_NOFS);
716 if (jh) {
717 atomic_inc(&nr_reiserfs_jh);
718 return jh;
719 }
720 yield();
721 }
722 }
723
724 /*
725 * we want to free the jh when the buffer has been written
726 * and waited on
727 */
728 void reiserfs_free_jh(struct buffer_head *bh)
729 {
730 struct reiserfs_jh *jh;
731
732 jh = bh->b_private;
733 if (jh) {
734 bh->b_private = NULL;
735 jh->bh = NULL;
736 list_del_init(&jh->list);
737 kfree(jh);
738 if (atomic_read(&nr_reiserfs_jh) <= 0)
739 BUG();
740 atomic_dec(&nr_reiserfs_jh);
741 put_bh(bh);
742 }
743 }
744
745 static inline int __add_jh(struct reiserfs_journal *j, struct buffer_head *bh,
746 int tail)
747 {
748 struct reiserfs_jh *jh;
749
750 if (bh->b_private) {
751 spin_lock(&j->j_dirty_buffers_lock);
752 if (!bh->b_private) {
753 spin_unlock(&j->j_dirty_buffers_lock);
754 goto no_jh;
755 }
756 jh = bh->b_private;
757 list_del_init(&jh->list);
758 } else {
759 no_jh:
760 get_bh(bh);
761 jh = alloc_jh();
762 spin_lock(&j->j_dirty_buffers_lock);
763 /* buffer must be locked for __add_jh, should be able to have
764 * two adds at the same time
765 */
766 BUG_ON(bh->b_private);
767 jh->bh = bh;
768 bh->b_private = jh;
769 }
770 jh->jl = j->j_current_jl;
771 if (tail)
772 list_add_tail(&jh->list, &jh->jl->j_tail_bh_list);
773 else {
774 list_add_tail(&jh->list, &jh->jl->j_bh_list);
775 }
776 spin_unlock(&j->j_dirty_buffers_lock);
777 return 0;
778 }
779
780 int reiserfs_add_tail_list(struct inode *inode, struct buffer_head *bh)
781 {
782 return __add_jh(SB_JOURNAL(inode->i_sb), bh, 1);
783 }
784 int reiserfs_add_ordered_list(struct inode *inode, struct buffer_head *bh)
785 {
786 return __add_jh(SB_JOURNAL(inode->i_sb), bh, 0);
787 }
788
789 #define JH_ENTRY(l) list_entry((l), struct reiserfs_jh, list)
790 static int write_ordered_buffers(spinlock_t * lock,
791 struct reiserfs_journal *j,
792 struct reiserfs_journal_list *jl,
793 struct list_head *list)
794 {
795 struct buffer_head *bh;
796 struct reiserfs_jh *jh;
797 int ret = j->j_errno;
798 struct buffer_chunk chunk;
799 struct list_head tmp;
800 INIT_LIST_HEAD(&tmp);
801
802 chunk.nr = 0;
803 spin_lock(lock);
804 while (!list_empty(list)) {
805 jh = JH_ENTRY(list->next);
806 bh = jh->bh;
807 get_bh(bh);
808 if (!trylock_buffer(bh)) {
809 if (!buffer_dirty(bh)) {
810 list_move(&jh->list, &tmp);
811 goto loop_next;
812 }
813 spin_unlock(lock);
814 if (chunk.nr)
815 write_ordered_chunk(&chunk);
816 wait_on_buffer(bh);
817 cond_resched();
818 spin_lock(lock);
819 goto loop_next;
820 }
821 /* in theory, dirty non-uptodate buffers should never get here,
822 * but the upper layer io error paths still have a few quirks.
823 * Handle them here as gracefully as we can
824 */
825 if (!buffer_uptodate(bh) && buffer_dirty(bh)) {
826 clear_buffer_dirty(bh);
827 ret = -EIO;
828 }
829 if (buffer_dirty(bh)) {
830 list_move(&jh->list, &tmp);
831 add_to_chunk(&chunk, bh, lock, write_ordered_chunk);
832 } else {
833 reiserfs_free_jh(bh);
834 unlock_buffer(bh);
835 }
836 loop_next:
837 put_bh(bh);
838 cond_resched_lock(lock);
839 }
840 if (chunk.nr) {
841 spin_unlock(lock);
842 write_ordered_chunk(&chunk);
843 spin_lock(lock);
844 }
845 while (!list_empty(&tmp)) {
846 jh = JH_ENTRY(tmp.prev);
847 bh = jh->bh;
848 get_bh(bh);
849 reiserfs_free_jh(bh);
850
851 if (buffer_locked(bh)) {
852 spin_unlock(lock);
853 wait_on_buffer(bh);
854 spin_lock(lock);
855 }
856 if (!buffer_uptodate(bh)) {
857 ret = -EIO;
858 }
859 /* ugly interaction with invalidatepage here.
860 * reiserfs_invalidate_page will pin any buffer that has a valid
861 * journal head from an older transaction. If someone else sets
862 * our buffer dirty after we write it in the first loop, and
863 * then someone truncates the page away, nobody will ever write
864 * the buffer. We're safe if we write the page one last time
865 * after freeing the journal header.
866 */
867 if (buffer_dirty(bh) && unlikely(bh->b_page->mapping == NULL)) {
868 spin_unlock(lock);
869 ll_rw_block(WRITE, 1, &bh);
870 spin_lock(lock);
871 }
872 put_bh(bh);
873 cond_resched_lock(lock);
874 }
875 spin_unlock(lock);
876 return ret;
877 }
878
879 static int flush_older_commits(struct super_block *s,
880 struct reiserfs_journal_list *jl)
881 {
882 struct reiserfs_journal *journal = SB_JOURNAL(s);
883 struct reiserfs_journal_list *other_jl;
884 struct reiserfs_journal_list *first_jl;
885 struct list_head *entry;
886 unsigned int trans_id = jl->j_trans_id;
887 unsigned int other_trans_id;
888 unsigned int first_trans_id;
889
890 find_first:
891 /*
892 * first we walk backwards to find the oldest uncommitted transation
893 */
894 first_jl = jl;
895 entry = jl->j_list.prev;
896 while (1) {
897 other_jl = JOURNAL_LIST_ENTRY(entry);
898 if (entry == &journal->j_journal_list ||
899 atomic_read(&other_jl->j_older_commits_done))
900 break;
901
902 first_jl = other_jl;
903 entry = other_jl->j_list.prev;
904 }
905
906 /* if we didn't find any older uncommitted transactions, return now */
907 if (first_jl == jl) {
908 return 0;
909 }
910
911 first_trans_id = first_jl->j_trans_id;
912
913 entry = &first_jl->j_list;
914 while (1) {
915 other_jl = JOURNAL_LIST_ENTRY(entry);
916 other_trans_id = other_jl->j_trans_id;
917
918 if (other_trans_id < trans_id) {
919 if (atomic_read(&other_jl->j_commit_left) != 0) {
920 flush_commit_list(s, other_jl, 0);
921
922 /* list we were called with is gone, return */
923 if (!journal_list_still_alive(s, trans_id))
924 return 1;
925
926 /* the one we just flushed is gone, this means all
927 * older lists are also gone, so first_jl is no longer
928 * valid either. Go back to the beginning.
929 */
930 if (!journal_list_still_alive
931 (s, other_trans_id)) {
932 goto find_first;
933 }
934 }
935 entry = entry->next;
936 if (entry == &journal->j_journal_list)
937 return 0;
938 } else {
939 return 0;
940 }
941 }
942 return 0;
943 }
944
945 static int reiserfs_async_progress_wait(struct super_block *s)
946 {
947 struct reiserfs_journal *j = SB_JOURNAL(s);
948
949 if (atomic_read(&j->j_async_throttle)) {
950 reiserfs_write_unlock(s);
951 congestion_wait(BLK_RW_ASYNC, HZ / 10);
952 reiserfs_write_lock(s);
953 }
954
955 return 0;
956 }
957
958 /*
959 ** if this journal list still has commit blocks unflushed, send them to disk.
960 **
961 ** log areas must be flushed in order (transaction 2 can't commit before transaction 1)
962 ** Before the commit block can by written, every other log block must be safely on disk
963 **
964 */
965 static int flush_commit_list(struct super_block *s,
966 struct reiserfs_journal_list *jl, int flushall)
967 {
968 int i;
969 b_blocknr_t bn;
970 struct buffer_head *tbh = NULL;
971 unsigned int trans_id = jl->j_trans_id;
972 struct reiserfs_journal *journal = SB_JOURNAL(s);
973 int retval = 0;
974 int write_len;
975
976 reiserfs_check_lock_depth(s, "flush_commit_list");
977
978 if (atomic_read(&jl->j_older_commits_done)) {
979 return 0;
980 }
981
982 /* before we can put our commit blocks on disk, we have to make sure everyone older than
983 ** us is on disk too
984 */
985 BUG_ON(jl->j_len <= 0);
986 BUG_ON(trans_id == journal->j_trans_id);
987
988 get_journal_list(jl);
989 if (flushall) {
990 if (flush_older_commits(s, jl) == 1) {
991 /* list disappeared during flush_older_commits. return */
992 goto put_jl;
993 }
994 }
995
996 /* make sure nobody is trying to flush this one at the same time */
997 reiserfs_mutex_lock_safe(&jl->j_commit_mutex, s);
998
999 if (!journal_list_still_alive(s, trans_id)) {
1000 mutex_unlock(&jl->j_commit_mutex);
1001 goto put_jl;
1002 }
1003 BUG_ON(jl->j_trans_id == 0);
1004
1005 /* this commit is done, exit */
1006 if (atomic_read(&(jl->j_commit_left)) <= 0) {
1007 if (flushall) {
1008 atomic_set(&(jl->j_older_commits_done), 1);
1009 }
1010 mutex_unlock(&jl->j_commit_mutex);
1011 goto put_jl;
1012 }
1013
1014 if (!list_empty(&jl->j_bh_list)) {
1015 int ret;
1016
1017 /*
1018 * We might sleep in numerous places inside
1019 * write_ordered_buffers. Relax the write lock.
1020 */
1021 reiserfs_write_unlock(s);
1022 ret = write_ordered_buffers(&journal->j_dirty_buffers_lock,
1023 journal, jl, &jl->j_bh_list);
1024 if (ret < 0 && retval == 0)
1025 retval = ret;
1026 reiserfs_write_lock(s);
1027 }
1028 BUG_ON(!list_empty(&jl->j_bh_list));
1029 /*
1030 * for the description block and all the log blocks, submit any buffers
1031 * that haven't already reached the disk. Try to write at least 256
1032 * log blocks. later on, we will only wait on blocks that correspond
1033 * to this transaction, but while we're unplugging we might as well
1034 * get a chunk of data on there.
1035 */
1036 atomic_inc(&journal->j_async_throttle);
1037 write_len = jl->j_len + 1;
1038 if (write_len < 256)
1039 write_len = 256;
1040 for (i = 0 ; i < write_len ; i++) {
1041 bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) + (jl->j_start + i) %
1042 SB_ONDISK_JOURNAL_SIZE(s);
1043 tbh = journal_find_get_block(s, bn);
1044 if (tbh) {
1045 if (buffer_dirty(tbh)) {
1046 reiserfs_write_unlock(s);
1047 ll_rw_block(WRITE, 1, &tbh);
1048 reiserfs_write_lock(s);
1049 }
1050 put_bh(tbh) ;
1051 }
1052 }
1053 atomic_dec(&journal->j_async_throttle);
1054
1055 for (i = 0; i < (jl->j_len + 1); i++) {
1056 bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) +
1057 (jl->j_start + i) % SB_ONDISK_JOURNAL_SIZE(s);
1058 tbh = journal_find_get_block(s, bn);
1059
1060 reiserfs_write_unlock(s);
1061 wait_on_buffer(tbh);
1062 reiserfs_write_lock(s);
1063 // since we're using ll_rw_blk above, it might have skipped over
1064 // a locked buffer. Double check here
1065 //
1066 /* redundant, sync_dirty_buffer() checks */
1067 if (buffer_dirty(tbh)) {
1068 reiserfs_write_unlock(s);
1069 sync_dirty_buffer(tbh);
1070 reiserfs_write_lock(s);
1071 }
1072 if (unlikely(!buffer_uptodate(tbh))) {
1073 #ifdef CONFIG_REISERFS_CHECK
1074 reiserfs_warning(s, "journal-601",
1075 "buffer write failed");
1076 #endif
1077 retval = -EIO;
1078 }
1079 put_bh(tbh); /* once for journal_find_get_block */
1080 put_bh(tbh); /* once due to original getblk in do_journal_end */
1081 atomic_dec(&(jl->j_commit_left));
1082 }
1083
1084 BUG_ON(atomic_read(&(jl->j_commit_left)) != 1);
1085
1086 /* If there was a write error in the journal - we can't commit
1087 * this transaction - it will be invalid and, if successful,
1088 * will just end up propagating the write error out to
1089 * the file system. */
1090 if (likely(!retval && !reiserfs_is_journal_aborted (journal))) {
1091 if (buffer_dirty(jl->j_commit_bh))
1092 BUG();
1093 mark_buffer_dirty(jl->j_commit_bh) ;
1094 reiserfs_write_unlock(s);
1095 if (reiserfs_barrier_flush(s))
1096 __sync_dirty_buffer(jl->j_commit_bh, WRITE_FLUSH_FUA);
1097 else
1098 sync_dirty_buffer(jl->j_commit_bh);
1099 reiserfs_write_lock(s);
1100 }
1101
1102 /* If there was a write error in the journal - we can't commit this
1103 * transaction - it will be invalid and, if successful, will just end
1104 * up propagating the write error out to the filesystem. */
1105 if (unlikely(!buffer_uptodate(jl->j_commit_bh))) {
1106 #ifdef CONFIG_REISERFS_CHECK
1107 reiserfs_warning(s, "journal-615", "buffer write failed");
1108 #endif
1109 retval = -EIO;
1110 }
1111 bforget(jl->j_commit_bh);
1112 if (journal->j_last_commit_id != 0 &&
1113 (jl->j_trans_id - journal->j_last_commit_id) != 1) {
1114 reiserfs_warning(s, "clm-2200", "last commit %lu, current %lu",
1115 journal->j_last_commit_id, jl->j_trans_id);
1116 }
1117 journal->j_last_commit_id = jl->j_trans_id;
1118
1119 /* now, every commit block is on the disk. It is safe to allow blocks freed during this transaction to be reallocated */
1120 cleanup_freed_for_journal_list(s, jl);
1121
1122 retval = retval ? retval : journal->j_errno;
1123
1124 /* mark the metadata dirty */
1125 if (!retval)
1126 dirty_one_transaction(s, jl);
1127 atomic_dec(&(jl->j_commit_left));
1128
1129 if (flushall) {
1130 atomic_set(&(jl->j_older_commits_done), 1);
1131 }
1132 mutex_unlock(&jl->j_commit_mutex);
1133 put_jl:
1134 put_journal_list(s, jl);
1135
1136 if (retval)
1137 reiserfs_abort(s, retval, "Journal write error in %s",
1138 __func__);
1139 return retval;
1140 }
1141
1142 /*
1143 ** flush_journal_list frequently needs to find a newer transaction for a given block. This does that, or
1144 ** returns NULL if it can't find anything
1145 */
1146 static struct reiserfs_journal_list *find_newer_jl_for_cn(struct
1147 reiserfs_journal_cnode
1148 *cn)
1149 {
1150 struct super_block *sb = cn->sb;
1151 b_blocknr_t blocknr = cn->blocknr;
1152
1153 cn = cn->hprev;
1154 while (cn) {
1155 if (cn->sb == sb && cn->blocknr == blocknr && cn->jlist) {
1156 return cn->jlist;
1157 }
1158 cn = cn->hprev;
1159 }
1160 return NULL;
1161 }
1162
1163 static int newer_jl_done(struct reiserfs_journal_cnode *cn)
1164 {
1165 struct super_block *sb = cn->sb;
1166 b_blocknr_t blocknr = cn->blocknr;
1167
1168 cn = cn->hprev;
1169 while (cn) {
1170 if (cn->sb == sb && cn->blocknr == blocknr && cn->jlist &&
1171 atomic_read(&cn->jlist->j_commit_left) != 0)
1172 return 0;
1173 cn = cn->hprev;
1174 }
1175 return 1;
1176 }
1177
1178 static void remove_journal_hash(struct super_block *,
1179 struct reiserfs_journal_cnode **,
1180 struct reiserfs_journal_list *, unsigned long,
1181 int);
1182
1183 /*
1184 ** once all the real blocks have been flushed, it is safe to remove them from the
1185 ** journal list for this transaction. Aside from freeing the cnode, this also allows the
1186 ** block to be reallocated for data blocks if it had been deleted.
1187 */
1188 static void remove_all_from_journal_list(struct super_block *sb,
1189 struct reiserfs_journal_list *jl,
1190 int debug)
1191 {
1192 struct reiserfs_journal *journal = SB_JOURNAL(sb);
1193 struct reiserfs_journal_cnode *cn, *last;
1194 cn = jl->j_realblock;
1195
1196 /* which is better, to lock once around the whole loop, or
1197 ** to lock for each call to remove_journal_hash?
1198 */
1199 while (cn) {
1200 if (cn->blocknr != 0) {
1201 if (debug) {
1202 reiserfs_warning(sb, "reiserfs-2201",
1203 "block %u, bh is %d, state %ld",
1204 cn->blocknr, cn->bh ? 1 : 0,
1205 cn->state);
1206 }
1207 cn->state = 0;
1208 remove_journal_hash(sb, journal->j_list_hash_table,
1209 jl, cn->blocknr, 1);
1210 }
1211 last = cn;
1212 cn = cn->next;
1213 free_cnode(sb, last);
1214 }
1215 jl->j_realblock = NULL;
1216 }
1217
1218 /*
1219 ** if this timestamp is greater than the timestamp we wrote last to the header block, write it to the header block.
1220 ** once this is done, I can safely say the log area for this transaction won't ever be replayed, and I can start
1221 ** releasing blocks in this transaction for reuse as data blocks.
1222 ** called by flush_journal_list, before it calls remove_all_from_journal_list
1223 **
1224 */
1225 static int _update_journal_header_block(struct super_block *sb,
1226 unsigned long offset,
1227 unsigned int trans_id)
1228 {
1229 struct reiserfs_journal_header *jh;
1230 struct reiserfs_journal *journal = SB_JOURNAL(sb);
1231
1232 if (reiserfs_is_journal_aborted(journal))
1233 return -EIO;
1234
1235 if (trans_id >= journal->j_last_flush_trans_id) {
1236 if (buffer_locked((journal->j_header_bh))) {
1237 reiserfs_write_unlock(sb);
1238 wait_on_buffer((journal->j_header_bh));
1239 reiserfs_write_lock(sb);
1240 if (unlikely(!buffer_uptodate(journal->j_header_bh))) {
1241 #ifdef CONFIG_REISERFS_CHECK
1242 reiserfs_warning(sb, "journal-699",
1243 "buffer write failed");
1244 #endif
1245 return -EIO;
1246 }
1247 }
1248 journal->j_last_flush_trans_id = trans_id;
1249 journal->j_first_unflushed_offset = offset;
1250 jh = (struct reiserfs_journal_header *)(journal->j_header_bh->
1251 b_data);
1252 jh->j_last_flush_trans_id = cpu_to_le32(trans_id);
1253 jh->j_first_unflushed_offset = cpu_to_le32(offset);
1254 jh->j_mount_id = cpu_to_le32(journal->j_mount_id);
1255
1256 set_buffer_dirty(journal->j_header_bh);
1257 reiserfs_write_unlock(sb);
1258
1259 if (reiserfs_barrier_flush(sb))
1260 __sync_dirty_buffer(journal->j_header_bh, WRITE_FLUSH_FUA);
1261 else
1262 sync_dirty_buffer(journal->j_header_bh);
1263
1264 reiserfs_write_lock(sb);
1265 if (!buffer_uptodate(journal->j_header_bh)) {
1266 reiserfs_warning(sb, "journal-837",
1267 "IO error during journal replay");
1268 return -EIO;
1269 }
1270 }
1271 return 0;
1272 }
1273
1274 static int update_journal_header_block(struct super_block *sb,
1275 unsigned long offset,
1276 unsigned int trans_id)
1277 {
1278 return _update_journal_header_block(sb, offset, trans_id);
1279 }
1280
1281 /*
1282 ** flush any and all journal lists older than you are
1283 ** can only be called from flush_journal_list
1284 */
1285 static int flush_older_journal_lists(struct super_block *sb,
1286 struct reiserfs_journal_list *jl)
1287 {
1288 struct list_head *entry;
1289 struct reiserfs_journal_list *other_jl;
1290 struct reiserfs_journal *journal = SB_JOURNAL(sb);
1291 unsigned int trans_id = jl->j_trans_id;
1292
1293 /* we know we are the only ones flushing things, no extra race
1294 * protection is required.
1295 */
1296 restart:
1297 entry = journal->j_journal_list.next;
1298 /* Did we wrap? */
1299 if (entry == &journal->j_journal_list)
1300 return 0;
1301 other_jl = JOURNAL_LIST_ENTRY(entry);
1302 if (other_jl->j_trans_id < trans_id) {
1303 BUG_ON(other_jl->j_refcount <= 0);
1304 /* do not flush all */
1305 flush_journal_list(sb, other_jl, 0);
1306
1307 /* other_jl is now deleted from the list */
1308 goto restart;
1309 }
1310 return 0;
1311 }
1312
1313 static void del_from_work_list(struct super_block *s,
1314 struct reiserfs_journal_list *jl)
1315 {
1316 struct reiserfs_journal *journal = SB_JOURNAL(s);
1317 if (!list_empty(&jl->j_working_list)) {
1318 list_del_init(&jl->j_working_list);
1319 journal->j_num_work_lists--;
1320 }
1321 }
1322
1323 /* flush a journal list, both commit and real blocks
1324 **
1325 ** always set flushall to 1, unless you are calling from inside
1326 ** flush_journal_list
1327 **
1328 ** IMPORTANT. This can only be called while there are no journal writers,
1329 ** and the journal is locked. That means it can only be called from
1330 ** do_journal_end, or by journal_release
1331 */
1332 static int flush_journal_list(struct super_block *s,
1333 struct reiserfs_journal_list *jl, int flushall)
1334 {
1335 struct reiserfs_journal_list *pjl;
1336 struct reiserfs_journal_cnode *cn, *last;
1337 int count;
1338 int was_jwait = 0;
1339 int was_dirty = 0;
1340 struct buffer_head *saved_bh;
1341 unsigned long j_len_saved = jl->j_len;
1342 struct reiserfs_journal *journal = SB_JOURNAL(s);
1343 int err = 0;
1344
1345 BUG_ON(j_len_saved <= 0);
1346
1347 if (atomic_read(&journal->j_wcount) != 0) {
1348 reiserfs_warning(s, "clm-2048", "called with wcount %d",
1349 atomic_read(&journal->j_wcount));
1350 }
1351 BUG_ON(jl->j_trans_id == 0);
1352
1353 /* if flushall == 0, the lock is already held */
1354 if (flushall) {
1355 reiserfs_mutex_lock_safe(&journal->j_flush_mutex, s);
1356 } else if (mutex_trylock(&journal->j_flush_mutex)) {
1357 BUG();
1358 }
1359
1360 count = 0;
1361 if (j_len_saved > journal->j_trans_max) {
1362 reiserfs_panic(s, "journal-715", "length is %lu, trans id %lu",
1363 j_len_saved, jl->j_trans_id);
1364 return 0;
1365 }
1366
1367 /* if all the work is already done, get out of here */
1368 if (atomic_read(&(jl->j_nonzerolen)) <= 0 &&
1369 atomic_read(&(jl->j_commit_left)) <= 0) {
1370 goto flush_older_and_return;
1371 }
1372
1373 /* start by putting the commit list on disk. This will also flush
1374 ** the commit lists of any olders transactions
1375 */
1376 flush_commit_list(s, jl, 1);
1377
1378 if (!(jl->j_state & LIST_DIRTY)
1379 && !reiserfs_is_journal_aborted(journal))
1380 BUG();
1381
1382 /* are we done now? */
1383 if (atomic_read(&(jl->j_nonzerolen)) <= 0 &&
1384 atomic_read(&(jl->j_commit_left)) <= 0) {
1385 goto flush_older_and_return;
1386 }
1387
1388 /* loop through each cnode, see if we need to write it,
1389 ** or wait on a more recent transaction, or just ignore it
1390 */
1391 if (atomic_read(&(journal->j_wcount)) != 0) {
1392 reiserfs_panic(s, "journal-844", "journal list is flushing, "
1393 "wcount is not 0");
1394 }
1395 cn = jl->j_realblock;
1396 while (cn) {
1397 was_jwait = 0;
1398 was_dirty = 0;
1399 saved_bh = NULL;
1400 /* blocknr of 0 is no longer in the hash, ignore it */
1401 if (cn->blocknr == 0) {
1402 goto free_cnode;
1403 }
1404
1405 /* This transaction failed commit. Don't write out to the disk */
1406 if (!(jl->j_state & LIST_DIRTY))
1407 goto free_cnode;
1408
1409 pjl = find_newer_jl_for_cn(cn);
1410 /* the order is important here. We check pjl to make sure we
1411 ** don't clear BH_JDirty_wait if we aren't the one writing this
1412 ** block to disk
1413 */
1414 if (!pjl && cn->bh) {
1415 saved_bh = cn->bh;
1416
1417 /* we do this to make sure nobody releases the buffer while
1418 ** we are working with it
1419 */
1420 get_bh(saved_bh);
1421
1422 if (buffer_journal_dirty(saved_bh)) {
1423 BUG_ON(!can_dirty(cn));
1424 was_jwait = 1;
1425 was_dirty = 1;
1426 } else if (can_dirty(cn)) {
1427 /* everything with !pjl && jwait should be writable */
1428 BUG();
1429 }
1430 }
1431
1432 /* if someone has this block in a newer transaction, just make
1433 ** sure they are committed, and don't try writing it to disk
1434 */
1435 if (pjl) {
1436 if (atomic_read(&pjl->j_commit_left))
1437 flush_commit_list(s, pjl, 1);
1438 goto free_cnode;
1439 }
1440
1441 /* bh == NULL when the block got to disk on its own, OR,
1442 ** the block got freed in a future transaction
1443 */
1444 if (saved_bh == NULL) {
1445 goto free_cnode;
1446 }
1447
1448 /* this should never happen. kupdate_one_transaction has this list
1449 ** locked while it works, so we should never see a buffer here that
1450 ** is not marked JDirty_wait
1451 */
1452 if ((!was_jwait) && !buffer_locked(saved_bh)) {
1453 reiserfs_warning(s, "journal-813",
1454 "BAD! buffer %llu %cdirty %cjwait, "
1455 "not in a newer tranasction",
1456 (unsigned long long)saved_bh->
1457 b_blocknr, was_dirty ? ' ' : '!',
1458 was_jwait ? ' ' : '!');
1459 }
1460 if (was_dirty) {
1461 /* we inc again because saved_bh gets decremented at free_cnode */
1462 get_bh(saved_bh);
1463 set_bit(BLOCK_NEEDS_FLUSH, &cn->state);
1464 lock_buffer(saved_bh);
1465 BUG_ON(cn->blocknr != saved_bh->b_blocknr);
1466 if (buffer_dirty(saved_bh))
1467 submit_logged_buffer(saved_bh);
1468 else
1469 unlock_buffer(saved_bh);
1470 count++;
1471 } else {
1472 reiserfs_warning(s, "clm-2082",
1473 "Unable to flush buffer %llu in %s",
1474 (unsigned long long)saved_bh->
1475 b_blocknr, __func__);
1476 }
1477 free_cnode:
1478 last = cn;
1479 cn = cn->next;
1480 if (saved_bh) {
1481 /* we incremented this to keep others from taking the buffer head away */
1482 put_bh(saved_bh);
1483 if (atomic_read(&(saved_bh->b_count)) < 0) {
1484 reiserfs_warning(s, "journal-945",
1485 "saved_bh->b_count < 0");
1486 }
1487 }
1488 }
1489 if (count > 0) {
1490 cn = jl->j_realblock;
1491 while (cn) {
1492 if (test_bit(BLOCK_NEEDS_FLUSH, &cn->state)) {
1493 if (!cn->bh) {
1494 reiserfs_panic(s, "journal-1011",
1495 "cn->bh is NULL");
1496 }
1497
1498 reiserfs_write_unlock(s);
1499 wait_on_buffer(cn->bh);
1500 reiserfs_write_lock(s);
1501
1502 if (!cn->bh) {
1503 reiserfs_panic(s, "journal-1012",
1504 "cn->bh is NULL");
1505 }
1506 if (unlikely(!buffer_uptodate(cn->bh))) {
1507 #ifdef CONFIG_REISERFS_CHECK
1508 reiserfs_warning(s, "journal-949",
1509 "buffer write failed");
1510 #endif
1511 err = -EIO;
1512 }
1513 /* note, we must clear the JDirty_wait bit after the up to date
1514 ** check, otherwise we race against our flushpage routine
1515 */
1516 BUG_ON(!test_clear_buffer_journal_dirty
1517 (cn->bh));
1518
1519 /* drop one ref for us */
1520 put_bh(cn->bh);
1521 /* drop one ref for journal_mark_dirty */
1522 release_buffer_page(cn->bh);
1523 }
1524 cn = cn->next;
1525 }
1526 }
1527
1528 if (err)
1529 reiserfs_abort(s, -EIO,
1530 "Write error while pushing transaction to disk in %s",
1531 __func__);
1532 flush_older_and_return:
1533
1534 /* before we can update the journal header block, we _must_ flush all
1535 ** real blocks from all older transactions to disk. This is because
1536 ** once the header block is updated, this transaction will not be
1537 ** replayed after a crash
1538 */
1539 if (flushall) {
1540 flush_older_journal_lists(s, jl);
1541 }
1542
1543 err = journal->j_errno;
1544 /* before we can remove everything from the hash tables for this
1545 ** transaction, we must make sure it can never be replayed
1546 **
1547 ** since we are only called from do_journal_end, we know for sure there
1548 ** are no allocations going on while we are flushing journal lists. So,
1549 ** we only need to update the journal header block for the last list
1550 ** being flushed
1551 */
1552 if (!err && flushall) {
1553 err =
1554 update_journal_header_block(s,
1555 (jl->j_start + jl->j_len +
1556 2) % SB_ONDISK_JOURNAL_SIZE(s),
1557 jl->j_trans_id);
1558 if (err)
1559 reiserfs_abort(s, -EIO,
1560 "Write error while updating journal header in %s",
1561 __func__);
1562 }
1563 remove_all_from_journal_list(s, jl, 0);
1564 list_del_init(&jl->j_list);
1565 journal->j_num_lists--;
1566 del_from_work_list(s, jl);
1567
1568 if (journal->j_last_flush_id != 0 &&
1569 (jl->j_trans_id - journal->j_last_flush_id) != 1) {
1570 reiserfs_warning(s, "clm-2201", "last flush %lu, current %lu",
1571 journal->j_last_flush_id, jl->j_trans_id);
1572 }
1573 journal->j_last_flush_id = jl->j_trans_id;
1574
1575 /* not strictly required since we are freeing the list, but it should
1576 * help find code using dead lists later on
1577 */
1578 jl->j_len = 0;
1579 atomic_set(&(jl->j_nonzerolen), 0);
1580 jl->j_start = 0;
1581 jl->j_realblock = NULL;
1582 jl->j_commit_bh = NULL;
1583 jl->j_trans_id = 0;
1584 jl->j_state = 0;
1585 put_journal_list(s, jl);
1586 if (flushall)
1587 mutex_unlock(&journal->j_flush_mutex);
1588 return err;
1589 }
1590
1591 static int test_transaction(struct super_block *s,
1592 struct reiserfs_journal_list *jl)
1593 {
1594 struct reiserfs_journal_cnode *cn;
1595
1596 if (jl->j_len == 0 || atomic_read(&jl->j_nonzerolen) == 0)
1597 return 1;
1598
1599 cn = jl->j_realblock;
1600 while (cn) {
1601 /* if the blocknr == 0, this has been cleared from the hash,
1602 ** skip it
1603 */
1604 if (cn->blocknr == 0) {
1605 goto next;
1606 }
1607 if (cn->bh && !newer_jl_done(cn))
1608 return 0;
1609 next:
1610 cn = cn->next;
1611 cond_resched();
1612 }
1613 return 0;
1614 }
1615
1616 static int write_one_transaction(struct super_block *s,
1617 struct reiserfs_journal_list *jl,
1618 struct buffer_chunk *chunk)
1619 {
1620 struct reiserfs_journal_cnode *cn;
1621 int ret = 0;
1622
1623 jl->j_state |= LIST_TOUCHED;
1624 del_from_work_list(s, jl);
1625 if (jl->j_len == 0 || atomic_read(&jl->j_nonzerolen) == 0) {
1626 return 0;
1627 }
1628
1629 cn = jl->j_realblock;
1630 while (cn) {
1631 /* if the blocknr == 0, this has been cleared from the hash,
1632 ** skip it
1633 */
1634 if (cn->blocknr == 0) {
1635 goto next;
1636 }
1637 if (cn->bh && can_dirty(cn) && buffer_dirty(cn->bh)) {
1638 struct buffer_head *tmp_bh;
1639 /* we can race against journal_mark_freed when we try
1640 * to lock_buffer(cn->bh), so we have to inc the buffer
1641 * count, and recheck things after locking
1642 */
1643 tmp_bh = cn->bh;
1644 get_bh(tmp_bh);
1645 lock_buffer(tmp_bh);
1646 if (cn->bh && can_dirty(cn) && buffer_dirty(tmp_bh)) {
1647 if (!buffer_journal_dirty(tmp_bh) ||
1648 buffer_journal_prepared(tmp_bh))
1649 BUG();
1650 add_to_chunk(chunk, tmp_bh, NULL, write_chunk);
1651 ret++;
1652 } else {
1653 /* note, cn->bh might be null now */
1654 unlock_buffer(tmp_bh);
1655 }
1656 put_bh(tmp_bh);
1657 }
1658 next:
1659 cn = cn->next;
1660 cond_resched();
1661 }
1662 return ret;
1663 }
1664
1665 /* used by flush_commit_list */
1666 static int dirty_one_transaction(struct super_block *s,
1667 struct reiserfs_journal_list *jl)
1668 {
1669 struct reiserfs_journal_cnode *cn;
1670 struct reiserfs_journal_list *pjl;
1671 int ret = 0;
1672
1673 jl->j_state |= LIST_DIRTY;
1674 cn = jl->j_realblock;
1675 while (cn) {
1676 /* look for a more recent transaction that logged this
1677 ** buffer. Only the most recent transaction with a buffer in
1678 ** it is allowed to send that buffer to disk
1679 */
1680 pjl = find_newer_jl_for_cn(cn);
1681 if (!pjl && cn->blocknr && cn->bh
1682 && buffer_journal_dirty(cn->bh)) {
1683 BUG_ON(!can_dirty(cn));
1684 /* if the buffer is prepared, it will either be logged
1685 * or restored. If restored, we need to make sure
1686 * it actually gets marked dirty
1687 */
1688 clear_buffer_journal_new(cn->bh);
1689 if (buffer_journal_prepared(cn->bh)) {
1690 set_buffer_journal_restore_dirty(cn->bh);
1691 } else {
1692 set_buffer_journal_test(cn->bh);
1693 mark_buffer_dirty(cn->bh);
1694 }
1695 }
1696 cn = cn->next;
1697 }
1698 return ret;
1699 }
1700
1701 static int kupdate_transactions(struct super_block *s,
1702 struct reiserfs_journal_list *jl,
1703 struct reiserfs_journal_list **next_jl,
1704 unsigned int *next_trans_id,
1705 int num_blocks, int num_trans)
1706 {
1707 int ret = 0;
1708 int written = 0;
1709 int transactions_flushed = 0;
1710 unsigned int orig_trans_id = jl->j_trans_id;
1711 struct buffer_chunk chunk;
1712 struct list_head *entry;
1713 struct reiserfs_journal *journal = SB_JOURNAL(s);
1714 chunk.nr = 0;
1715
1716 reiserfs_mutex_lock_safe(&journal->j_flush_mutex, s);
1717 if (!journal_list_still_alive(s, orig_trans_id)) {
1718 goto done;
1719 }
1720
1721 /* we've got j_flush_mutex held, nobody is going to delete any
1722 * of these lists out from underneath us
1723 */
1724 while ((num_trans && transactions_flushed < num_trans) ||
1725 (!num_trans && written < num_blocks)) {
1726
1727 if (jl->j_len == 0 || (jl->j_state & LIST_TOUCHED) ||
1728 atomic_read(&jl->j_commit_left)
1729 || !(jl->j_state & LIST_DIRTY)) {
1730 del_from_work_list(s, jl);
1731 break;
1732 }
1733 ret = write_one_transaction(s, jl, &chunk);
1734
1735 if (ret < 0)
1736 goto done;
1737 transactions_flushed++;
1738 written += ret;
1739 entry = jl->j_list.next;
1740
1741 /* did we wrap? */
1742 if (entry == &journal->j_journal_list) {
1743 break;
1744 }
1745 jl = JOURNAL_LIST_ENTRY(entry);
1746
1747 /* don't bother with older transactions */
1748 if (jl->j_trans_id <= orig_trans_id)
1749 break;
1750 }
1751 if (chunk.nr) {
1752 write_chunk(&chunk);
1753 }
1754
1755 done:
1756 mutex_unlock(&journal->j_flush_mutex);
1757 return ret;
1758 }
1759
1760 /* for o_sync and fsync heavy applications, they tend to use
1761 ** all the journa list slots with tiny transactions. These
1762 ** trigger lots and lots of calls to update the header block, which
1763 ** adds seeks and slows things down.
1764 **
1765 ** This function tries to clear out a large chunk of the journal lists
1766 ** at once, which makes everything faster since only the newest journal
1767 ** list updates the header block
1768 */
1769 static int flush_used_journal_lists(struct super_block *s,
1770 struct reiserfs_journal_list *jl)
1771 {
1772 unsigned long len = 0;
1773 unsigned long cur_len;
1774 int ret;
1775 int i;
1776 int limit = 256;
1777 struct reiserfs_journal_list *tjl;
1778 struct reiserfs_journal_list *flush_jl;
1779 unsigned int trans_id;
1780 struct reiserfs_journal *journal = SB_JOURNAL(s);
1781
1782 flush_jl = tjl = jl;
1783
1784 /* in data logging mode, try harder to flush a lot of blocks */
1785 if (reiserfs_data_log(s))
1786 limit = 1024;
1787 /* flush for 256 transactions or limit blocks, whichever comes first */
1788 for (i = 0; i < 256 && len < limit; i++) {
1789 if (atomic_read(&tjl->j_commit_left) ||
1790 tjl->j_trans_id < jl->j_trans_id) {
1791 break;
1792 }
1793 cur_len = atomic_read(&tjl->j_nonzerolen);
1794 if (cur_len > 0) {
1795 tjl->j_state &= ~LIST_TOUCHED;
1796 }
1797 len += cur_len;
1798 flush_jl = tjl;
1799 if (tjl->j_list.next == &journal->j_journal_list)
1800 break;
1801 tjl = JOURNAL_LIST_ENTRY(tjl->j_list.next);
1802 }
1803 /* try to find a group of blocks we can flush across all the
1804 ** transactions, but only bother if we've actually spanned
1805 ** across multiple lists
1806 */
1807 if (flush_jl != jl) {
1808 ret = kupdate_transactions(s, jl, &tjl, &trans_id, len, i);
1809 }
1810 flush_journal_list(s, flush_jl, 1);
1811 return 0;
1812 }
1813
1814 /*
1815 ** removes any nodes in table with name block and dev as bh.
1816 ** only touchs the hnext and hprev pointers.
1817 */
1818 void remove_journal_hash(struct super_block *sb,
1819 struct reiserfs_journal_cnode **table,
1820 struct reiserfs_journal_list *jl,
1821 unsigned long block, int remove_freed)
1822 {
1823 struct reiserfs_journal_cnode *cur;
1824 struct reiserfs_journal_cnode **head;
1825
1826 head = &(journal_hash(table, sb, block));
1827 if (!head) {
1828 return;
1829 }
1830 cur = *head;
1831 while (cur) {
1832 if (cur->blocknr == block && cur->sb == sb
1833 && (jl == NULL || jl == cur->jlist)
1834 && (!test_bit(BLOCK_FREED, &cur->state) || remove_freed)) {
1835 if (cur->hnext) {
1836 cur->hnext->hprev = cur->hprev;
1837 }
1838 if (cur->hprev) {
1839 cur->hprev->hnext = cur->hnext;
1840 } else {
1841 *head = cur->hnext;
1842 }
1843 cur->blocknr = 0;
1844 cur->sb = NULL;
1845 cur->state = 0;
1846 if (cur->bh && cur->jlist) /* anybody who clears the cur->bh will also dec the nonzerolen */
1847 atomic_dec(&(cur->jlist->j_nonzerolen));
1848 cur->bh = NULL;
1849 cur->jlist = NULL;
1850 }
1851 cur = cur->hnext;
1852 }
1853 }
1854
1855 static void free_journal_ram(struct super_block *sb)
1856 {
1857 struct reiserfs_journal *journal = SB_JOURNAL(sb);
1858 kfree(journal->j_current_jl);
1859 journal->j_num_lists--;
1860
1861 vfree(journal->j_cnode_free_orig);
1862 free_list_bitmaps(sb, journal->j_list_bitmap);
1863 free_bitmap_nodes(sb); /* must be after free_list_bitmaps */
1864 if (journal->j_header_bh) {
1865 brelse(journal->j_header_bh);
1866 }
1867 /* j_header_bh is on the journal dev, make sure not to release the journal
1868 * dev until we brelse j_header_bh
1869 */
1870 release_journal_dev(sb, journal);
1871 vfree(journal);
1872 }
1873
1874 /*
1875 ** call on unmount. Only set error to 1 if you haven't made your way out
1876 ** of read_super() yet. Any other caller must keep error at 0.
1877 */
1878 static int do_journal_release(struct reiserfs_transaction_handle *th,
1879 struct super_block *sb, int error)
1880 {
1881 struct reiserfs_transaction_handle myth;
1882 int flushed = 0;
1883 struct reiserfs_journal *journal = SB_JOURNAL(sb);
1884
1885 /* we only want to flush out transactions if we were called with error == 0
1886 */
1887 if (!error && !(sb->s_flags & MS_RDONLY)) {
1888 /* end the current trans */
1889 BUG_ON(!th->t_trans_id);
1890 do_journal_end(th, sb, 10, FLUSH_ALL);
1891
1892 /* make sure something gets logged to force our way into the flush code */
1893 if (!journal_join(&myth, sb, 1)) {
1894 reiserfs_prepare_for_journal(sb,
1895 SB_BUFFER_WITH_SB(sb),
1896 1);
1897 journal_mark_dirty(&myth, sb,
1898 SB_BUFFER_WITH_SB(sb));
1899 do_journal_end(&myth, sb, 1, FLUSH_ALL);
1900 flushed = 1;
1901 }
1902 }
1903
1904 /* this also catches errors during the do_journal_end above */
1905 if (!error && reiserfs_is_journal_aborted(journal)) {
1906 memset(&myth, 0, sizeof(myth));
1907 if (!journal_join_abort(&myth, sb, 1)) {
1908 reiserfs_prepare_for_journal(sb,
1909 SB_BUFFER_WITH_SB(sb),
1910 1);
1911 journal_mark_dirty(&myth, sb,
1912 SB_BUFFER_WITH_SB(sb));
1913 do_journal_end(&myth, sb, 1, FLUSH_ALL);
1914 }
1915 }
1916
1917 reiserfs_mounted_fs_count--;
1918 /* wait for all commits to finish */
1919 cancel_delayed_work(&SB_JOURNAL(sb)->j_work);
1920
1921 /*
1922 * We must release the write lock here because
1923 * the workqueue job (flush_async_commit) needs this lock
1924 */
1925 reiserfs_write_unlock(sb);
1926 flush_workqueue(commit_wq);
1927
1928 if (!reiserfs_mounted_fs_count) {
1929 destroy_workqueue(commit_wq);
1930 commit_wq = NULL;
1931 }
1932
1933 free_journal_ram(sb);
1934
1935 reiserfs_write_lock(sb);
1936
1937 return 0;
1938 }
1939
1940 /*
1941 ** call on unmount. flush all journal trans, release all alloc'd ram
1942 */
1943 int journal_release(struct reiserfs_transaction_handle *th,
1944 struct super_block *sb)
1945 {
1946 return do_journal_release(th, sb, 0);
1947 }
1948
1949 /*
1950 ** only call from an error condition inside reiserfs_read_super!
1951 */
1952 int journal_release_error(struct reiserfs_transaction_handle *th,
1953 struct super_block *sb)
1954 {
1955 return do_journal_release(th, sb, 1);
1956 }
1957
1958 /* compares description block with commit block. returns 1 if they differ, 0 if they are the same */
1959 static int journal_compare_desc_commit(struct super_block *sb,
1960 struct reiserfs_journal_desc *desc,
1961 struct reiserfs_journal_commit *commit)
1962 {
1963 if (get_commit_trans_id(commit) != get_desc_trans_id(desc) ||
1964 get_commit_trans_len(commit) != get_desc_trans_len(desc) ||
1965 get_commit_trans_len(commit) > SB_JOURNAL(sb)->j_trans_max ||
1966 get_commit_trans_len(commit) <= 0) {
1967 return 1;
1968 }
1969 return 0;
1970 }
1971
1972 /* returns 0 if it did not find a description block
1973 ** returns -1 if it found a corrupt commit block
1974 ** returns 1 if both desc and commit were valid
1975 */
1976 static int journal_transaction_is_valid(struct super_block *sb,
1977 struct buffer_head *d_bh,
1978 unsigned int *oldest_invalid_trans_id,
1979 unsigned long *newest_mount_id)
1980 {
1981 struct reiserfs_journal_desc *desc;
1982 struct reiserfs_journal_commit *commit;
1983 struct buffer_head *c_bh;
1984 unsigned long offset;
1985
1986 if (!d_bh)
1987 return 0;
1988
1989 desc = (struct reiserfs_journal_desc *)d_bh->b_data;
1990 if (get_desc_trans_len(desc) > 0
1991 && !memcmp(get_journal_desc_magic(d_bh), JOURNAL_DESC_MAGIC, 8)) {
1992 if (oldest_invalid_trans_id && *oldest_invalid_trans_id
1993 && get_desc_trans_id(desc) > *oldest_invalid_trans_id) {
1994 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
1995 "journal-986: transaction "
1996 "is valid returning because trans_id %d is greater than "
1997 "oldest_invalid %lu",
1998 get_desc_trans_id(desc),
1999 *oldest_invalid_trans_id);
2000 return 0;
2001 }
2002 if (newest_mount_id
2003 && *newest_mount_id > get_desc_mount_id(desc)) {
2004 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2005 "journal-1087: transaction "
2006 "is valid returning because mount_id %d is less than "
2007 "newest_mount_id %lu",
2008 get_desc_mount_id(desc),
2009 *newest_mount_id);
2010 return -1;
2011 }
2012 if (get_desc_trans_len(desc) > SB_JOURNAL(sb)->j_trans_max) {
2013 reiserfs_warning(sb, "journal-2018",
2014 "Bad transaction length %d "
2015 "encountered, ignoring transaction",
2016 get_desc_trans_len(desc));
2017 return -1;
2018 }
2019 offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2020
2021 /* ok, we have a journal description block, lets see if the transaction was valid */
2022 c_bh =
2023 journal_bread(sb,
2024 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2025 ((offset + get_desc_trans_len(desc) +
2026 1) % SB_ONDISK_JOURNAL_SIZE(sb)));
2027 if (!c_bh)
2028 return 0;
2029 commit = (struct reiserfs_journal_commit *)c_bh->b_data;
2030 if (journal_compare_desc_commit(sb, desc, commit)) {
2031 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2032 "journal_transaction_is_valid, commit offset %ld had bad "
2033 "time %d or length %d",
2034 c_bh->b_blocknr -
2035 SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2036 get_commit_trans_id(commit),
2037 get_commit_trans_len(commit));
2038 brelse(c_bh);
2039 if (oldest_invalid_trans_id) {
2040 *oldest_invalid_trans_id =
2041 get_desc_trans_id(desc);
2042 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2043 "journal-1004: "
2044 "transaction_is_valid setting oldest invalid trans_id "
2045 "to %d",
2046 get_desc_trans_id(desc));
2047 }
2048 return -1;
2049 }
2050 brelse(c_bh);
2051 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2052 "journal-1006: found valid "
2053 "transaction start offset %llu, len %d id %d",
2054 d_bh->b_blocknr -
2055 SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2056 get_desc_trans_len(desc),
2057 get_desc_trans_id(desc));
2058 return 1;
2059 } else {
2060 return 0;
2061 }
2062 }
2063
2064 static void brelse_array(struct buffer_head **heads, int num)
2065 {
2066 int i;
2067 for (i = 0; i < num; i++) {
2068 brelse(heads[i]);
2069 }
2070 }
2071
2072 /*
2073 ** given the start, and values for the oldest acceptable transactions,
2074 ** this either reads in a replays a transaction, or returns because the transaction
2075 ** is invalid, or too old.
2076 */
2077 static int journal_read_transaction(struct super_block *sb,
2078 unsigned long cur_dblock,
2079 unsigned long oldest_start,
2080 unsigned int oldest_trans_id,
2081 unsigned long newest_mount_id)
2082 {
2083 struct reiserfs_journal *journal = SB_JOURNAL(sb);
2084 struct reiserfs_journal_desc *desc;
2085 struct reiserfs_journal_commit *commit;
2086 unsigned int trans_id = 0;
2087 struct buffer_head *c_bh;
2088 struct buffer_head *d_bh;
2089 struct buffer_head **log_blocks = NULL;
2090 struct buffer_head **real_blocks = NULL;
2091 unsigned int trans_offset;
2092 int i;
2093 int trans_half;
2094
2095 d_bh = journal_bread(sb, cur_dblock);
2096 if (!d_bh)
2097 return 1;
2098 desc = (struct reiserfs_journal_desc *)d_bh->b_data;
2099 trans_offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2100 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1037: "
2101 "journal_read_transaction, offset %llu, len %d mount_id %d",
2102 d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2103 get_desc_trans_len(desc), get_desc_mount_id(desc));
2104 if (get_desc_trans_id(desc) < oldest_trans_id) {
2105 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1039: "
2106 "journal_read_trans skipping because %lu is too old",
2107 cur_dblock -
2108 SB_ONDISK_JOURNAL_1st_BLOCK(sb));
2109 brelse(d_bh);
2110 return 1;
2111 }
2112 if (get_desc_mount_id(desc) != newest_mount_id) {
2113 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1146: "
2114 "journal_read_trans skipping because %d is != "
2115 "newest_mount_id %lu", get_desc_mount_id(desc),
2116 newest_mount_id);
2117 brelse(d_bh);
2118 return 1;
2119 }
2120 c_bh = journal_bread(sb, SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2121 ((trans_offset + get_desc_trans_len(desc) + 1) %
2122 SB_ONDISK_JOURNAL_SIZE(sb)));
2123 if (!c_bh) {
2124 brelse(d_bh);
2125 return 1;
2126 }
2127 commit = (struct reiserfs_journal_commit *)c_bh->b_data;
2128 if (journal_compare_desc_commit(sb, desc, commit)) {
2129 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2130 "journal_read_transaction, "
2131 "commit offset %llu had bad time %d or length %d",
2132 c_bh->b_blocknr -
2133 SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2134 get_commit_trans_id(commit),
2135 get_commit_trans_len(commit));
2136 brelse(c_bh);
2137 brelse(d_bh);
2138 return 1;
2139 }
2140
2141 if (bdev_read_only(sb->s_bdev)) {
2142 reiserfs_warning(sb, "clm-2076",
2143 "device is readonly, unable to replay log");
2144 brelse(c_bh);
2145 brelse(d_bh);
2146 return -EROFS;
2147 }
2148
2149 trans_id = get_desc_trans_id(desc);
2150 /* now we know we've got a good transaction, and it was inside the valid time ranges */
2151 log_blocks = kmalloc(get_desc_trans_len(desc) *
2152 sizeof(struct buffer_head *), GFP_NOFS);
2153 real_blocks = kmalloc(get_desc_trans_len(desc) *
2154 sizeof(struct buffer_head *), GFP_NOFS);
2155 if (!log_blocks || !real_blocks) {
2156 brelse(c_bh);
2157 brelse(d_bh);
2158 kfree(log_blocks);
2159 kfree(real_blocks);
2160 reiserfs_warning(sb, "journal-1169",
2161 "kmalloc failed, unable to mount FS");
2162 return -1;
2163 }
2164 /* get all the buffer heads */
2165 trans_half = journal_trans_half(sb->s_blocksize);
2166 for (i = 0; i < get_desc_trans_len(desc); i++) {
2167 log_blocks[i] =
2168 journal_getblk(sb,
2169 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2170 (trans_offset + 1 +
2171 i) % SB_ONDISK_JOURNAL_SIZE(sb));
2172 if (i < trans_half) {
2173 real_blocks[i] =
2174 sb_getblk(sb,
2175 le32_to_cpu(desc->j_realblock[i]));
2176 } else {
2177 real_blocks[i] =
2178 sb_getblk(sb,
2179 le32_to_cpu(commit->
2180 j_realblock[i - trans_half]));
2181 }
2182 if (real_blocks[i]->b_blocknr > SB_BLOCK_COUNT(sb)) {
2183 reiserfs_warning(sb, "journal-1207",
2184 "REPLAY FAILURE fsck required! "
2185 "Block to replay is outside of "
2186 "filesystem");
2187 goto abort_replay;
2188 }
2189 /* make sure we don't try to replay onto log or reserved area */
2190 if (is_block_in_log_or_reserved_area
2191 (sb, real_blocks[i]->b_blocknr)) {
2192 reiserfs_warning(sb, "journal-1204",
2193 "REPLAY FAILURE fsck required! "
2194 "Trying to replay onto a log block");
2195 abort_replay:
2196 brelse_array(log_blocks, i);
2197 brelse_array(real_blocks, i);
2198 brelse(c_bh);
2199 brelse(d_bh);
2200 kfree(log_blocks);
2201 kfree(real_blocks);
2202 return -1;
2203 }
2204 }
2205 /* read in the log blocks, memcpy to the corresponding real block */
2206 ll_rw_block(READ, get_desc_trans_len(desc), log_blocks);
2207 for (i = 0; i < get_desc_trans_len(desc); i++) {
2208
2209 reiserfs_write_unlock(sb);
2210 wait_on_buffer(log_blocks[i]);
2211 reiserfs_write_lock(sb);
2212
2213 if (!buffer_uptodate(log_blocks[i])) {
2214 reiserfs_warning(sb, "journal-1212",
2215 "REPLAY FAILURE fsck required! "
2216 "buffer write failed");
2217 brelse_array(log_blocks + i,
2218 get_desc_trans_len(desc) - i);
2219 brelse_array(real_blocks, get_desc_trans_len(desc));
2220 brelse(c_bh);
2221 brelse(d_bh);
2222 kfree(log_blocks);
2223 kfree(real_blocks);
2224 return -1;
2225 }
2226 memcpy(real_blocks[i]->b_data, log_blocks[i]->b_data,
2227 real_blocks[i]->b_size);
2228 set_buffer_uptodate(real_blocks[i]);
2229 brelse(log_blocks[i]);
2230 }
2231 /* flush out the real blocks */
2232 for (i = 0; i < get_desc_trans_len(desc); i++) {
2233 set_buffer_dirty(real_blocks[i]);
2234 write_dirty_buffer(real_blocks[i], WRITE);
2235 }
2236 for (i = 0; i < get_desc_trans_len(desc); i++) {
2237 wait_on_buffer(real_blocks[i]);
2238 if (!buffer_uptodate(real_blocks[i])) {
2239 reiserfs_warning(sb, "journal-1226",
2240 "REPLAY FAILURE, fsck required! "
2241 "buffer write failed");
2242 brelse_array(real_blocks + i,
2243 get_desc_trans_len(desc) - i);
2244 brelse(c_bh);
2245 brelse(d_bh);
2246 kfree(log_blocks);
2247 kfree(real_blocks);
2248 return -1;
2249 }
2250 brelse(real_blocks[i]);
2251 }
2252 cur_dblock =
2253 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2254 ((trans_offset + get_desc_trans_len(desc) +
2255 2) % SB_ONDISK_JOURNAL_SIZE(sb));
2256 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2257 "journal-1095: setting journal " "start to offset %ld",
2258 cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb));
2259
2260 /* init starting values for the first transaction, in case this is the last transaction to be replayed. */
2261 journal->j_start = cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2262 journal->j_last_flush_trans_id = trans_id;
2263 journal->j_trans_id = trans_id + 1;
2264 /* check for trans_id overflow */
2265 if (journal->j_trans_id == 0)
2266 journal->j_trans_id = 10;
2267 brelse(c_bh);
2268 brelse(d_bh);
2269 kfree(log_blocks);
2270 kfree(real_blocks);
2271 return 0;
2272 }
2273
2274 /* This function reads blocks starting from block and to max_block of bufsize
2275 size (but no more than BUFNR blocks at a time). This proved to improve
2276 mounting speed on self-rebuilding raid5 arrays at least.
2277 Right now it is only used from journal code. But later we might use it
2278 from other places.
2279 Note: Do not use journal_getblk/sb_getblk functions here! */
2280 static struct buffer_head *reiserfs_breada(struct block_device *dev,
2281 b_blocknr_t block, int bufsize,
2282 b_blocknr_t max_block)
2283 {
2284 struct buffer_head *bhlist[BUFNR];
2285 unsigned int blocks = BUFNR;
2286 struct buffer_head *bh;
2287 int i, j;
2288
2289 bh = __getblk(dev, block, bufsize);
2290 if (buffer_uptodate(bh))
2291 return (bh);
2292
2293 if (block + BUFNR > max_block) {
2294 blocks = max_block - block;
2295 }
2296 bhlist[0] = bh;
2297 j = 1;
2298 for (i = 1; i < blocks; i++) {
2299 bh = __getblk(dev, block + i, bufsize);
2300 if (buffer_uptodate(bh)) {
2301 brelse(bh);
2302 break;
2303 } else
2304 bhlist[j++] = bh;
2305 }
2306 ll_rw_block(READ, j, bhlist);
2307 for (i = 1; i < j; i++)
2308 brelse(bhlist[i]);
2309 bh = bhlist[0];
2310 wait_on_buffer(bh);
2311 if (buffer_uptodate(bh))
2312 return bh;
2313 brelse(bh);
2314 return NULL;
2315 }
2316
2317 /*
2318 ** read and replay the log
2319 ** on a clean unmount, the journal header's next unflushed pointer will be to an invalid
2320 ** transaction. This tests that before finding all the transactions in the log, which makes normal mount times fast.
2321 **
2322 ** After a crash, this starts with the next unflushed transaction, and replays until it finds one too old, or invalid.
2323 **
2324 ** On exit, it sets things up so the first transaction will work correctly.
2325 */
2326 static int journal_read(struct super_block *sb)
2327 {
2328 struct reiserfs_journal *journal = SB_JOURNAL(sb);
2329 struct reiserfs_journal_desc *desc;
2330 unsigned int oldest_trans_id = 0;
2331 unsigned int oldest_invalid_trans_id = 0;
2332 time_t start;
2333 unsigned long oldest_start = 0;
2334 unsigned long cur_dblock = 0;
2335 unsigned long newest_mount_id = 9;
2336 struct buffer_head *d_bh;
2337 struct reiserfs_journal_header *jh;
2338 int valid_journal_header = 0;
2339 int replay_count = 0;
2340 int continue_replay = 1;
2341 int ret;
2342 char b[BDEVNAME_SIZE];
2343
2344 cur_dblock = SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2345 reiserfs_info(sb, "checking transaction log (%s)\n",
2346 bdevname(journal->j_dev_bd, b));
2347 start = get_seconds();
2348
2349 /* step 1, read in the journal header block. Check the transaction it says
2350 ** is the first unflushed, and if that transaction is not valid,
2351 ** replay is done
2352 */
2353 journal->j_header_bh = journal_bread(sb,
2354 SB_ONDISK_JOURNAL_1st_BLOCK(sb)
2355 + SB_ONDISK_JOURNAL_SIZE(sb));
2356 if (!journal->j_header_bh) {
2357 return 1;
2358 }
2359 jh = (struct reiserfs_journal_header *)(journal->j_header_bh->b_data);
2360 if (le32_to_cpu(jh->j_first_unflushed_offset) <
2361 SB_ONDISK_JOURNAL_SIZE(sb)
2362 && le32_to_cpu(jh->j_last_flush_trans_id) > 0) {
2363 oldest_start =
2364 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2365 le32_to_cpu(jh->j_first_unflushed_offset);
2366 oldest_trans_id = le32_to_cpu(jh->j_last_flush_trans_id) + 1;
2367 newest_mount_id = le32_to_cpu(jh->j_mount_id);
2368 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2369 "journal-1153: found in "
2370 "header: first_unflushed_offset %d, last_flushed_trans_id "
2371 "%lu", le32_to_cpu(jh->j_first_unflushed_offset),
2372 le32_to_cpu(jh->j_last_flush_trans_id));
2373 valid_journal_header = 1;
2374
2375 /* now, we try to read the first unflushed offset. If it is not valid,
2376 ** there is nothing more we can do, and it makes no sense to read
2377 ** through the whole log.
2378 */
2379 d_bh =
2380 journal_bread(sb,
2381 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2382 le32_to_cpu(jh->j_first_unflushed_offset));
2383 ret = journal_transaction_is_valid(sb, d_bh, NULL, NULL);
2384 if (!ret) {
2385 continue_replay = 0;
2386 }
2387 brelse(d_bh);
2388 goto start_log_replay;
2389 }
2390
2391 /* ok, there are transactions that need to be replayed. start with the first log block, find
2392 ** all the valid transactions, and pick out the oldest.
2393 */
2394 while (continue_replay
2395 && cur_dblock <
2396 (SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2397 SB_ONDISK_JOURNAL_SIZE(sb))) {
2398 /* Note that it is required for blocksize of primary fs device and journal
2399 device to be the same */
2400 d_bh =
2401 reiserfs_breada(journal->j_dev_bd, cur_dblock,
2402 sb->s_blocksize,
2403 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2404 SB_ONDISK_JOURNAL_SIZE(sb));
2405 ret =
2406 journal_transaction_is_valid(sb, d_bh,
2407 &oldest_invalid_trans_id,
2408 &newest_mount_id);
2409 if (ret == 1) {
2410 desc = (struct reiserfs_journal_desc *)d_bh->b_data;
2411 if (oldest_start == 0) { /* init all oldest_ values */
2412 oldest_trans_id = get_desc_trans_id(desc);
2413 oldest_start = d_bh->b_blocknr;
2414 newest_mount_id = get_desc_mount_id(desc);
2415 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2416 "journal-1179: Setting "
2417 "oldest_start to offset %llu, trans_id %lu",
2418 oldest_start -
2419 SB_ONDISK_JOURNAL_1st_BLOCK
2420 (sb), oldest_trans_id);
2421 } else if (oldest_trans_id > get_desc_trans_id(desc)) {
2422 /* one we just read was older */
2423 oldest_trans_id = get_desc_trans_id(desc);
2424 oldest_start = d_bh->b_blocknr;
2425 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2426 "journal-1180: Resetting "
2427 "oldest_start to offset %lu, trans_id %lu",
2428 oldest_start -
2429 SB_ONDISK_JOURNAL_1st_BLOCK
2430 (sb), oldest_trans_id);
2431 }
2432 if (newest_mount_id < get_desc_mount_id(desc)) {
2433 newest_mount_id = get_desc_mount_id(desc);
2434 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2435 "journal-1299: Setting "
2436 "newest_mount_id to %d",
2437 get_desc_mount_id(desc));
2438 }
2439 cur_dblock += get_desc_trans_len(desc) + 2;
2440 } else {
2441 cur_dblock++;
2442 }
2443 brelse(d_bh);
2444 }
2445
2446 start_log_replay:
2447 cur_dblock = oldest_start;
2448 if (oldest_trans_id) {
2449 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2450 "journal-1206: Starting replay "
2451 "from offset %llu, trans_id %lu",
2452 cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2453 oldest_trans_id);
2454
2455 }
2456 replay_count = 0;
2457 while (continue_replay && oldest_trans_id > 0) {
2458 ret =
2459 journal_read_transaction(sb, cur_dblock, oldest_start,
2460 oldest_trans_id, newest_mount_id);
2461 if (ret < 0) {
2462 return ret;
2463 } else if (ret != 0) {
2464 break;
2465 }
2466 cur_dblock =
2467 SB_ONDISK_JOURNAL_1st_BLOCK(sb) + journal->j_start;
2468 replay_count++;
2469 if (cur_dblock == oldest_start)
2470 break;
2471 }
2472
2473 if (oldest_trans_id == 0) {
2474 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2475 "journal-1225: No valid " "transactions found");
2476 }
2477 /* j_start does not get set correctly if we don't replay any transactions.
2478 ** if we had a valid journal_header, set j_start to the first unflushed transaction value,
2479 ** copy the trans_id from the header
2480 */
2481 if (valid_journal_header && replay_count == 0) {
2482 journal->j_start = le32_to_cpu(jh->j_first_unflushed_offset);
2483 journal->j_trans_id =
2484 le32_to_cpu(jh->j_last_flush_trans_id) + 1;
2485 /* check for trans_id overflow */
2486 if (journal->j_trans_id == 0)
2487 journal->j_trans_id = 10;
2488 journal->j_last_flush_trans_id =
2489 le32_to_cpu(jh->j_last_flush_trans_id);
2490 journal->j_mount_id = le32_to_cpu(jh->j_mount_id) + 1;
2491 } else {
2492 journal->j_mount_id = newest_mount_id + 1;
2493 }
2494 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1299: Setting "
2495 "newest_mount_id to %lu", journal->j_mount_id);
2496 journal->j_first_unflushed_offset = journal->j_start;
2497 if (replay_count > 0) {
2498 reiserfs_info(sb,
2499 "replayed %d transactions in %lu seconds\n",
2500 replay_count, get_seconds() - start);
2501 }
2502 if (!bdev_read_only(sb->s_bdev) &&
2503 _update_journal_header_block(sb, journal->j_start,
2504 journal->j_last_flush_trans_id)) {
2505 /* replay failed, caller must call free_journal_ram and abort
2506 ** the mount
2507 */
2508 return -1;
2509 }
2510 return 0;
2511 }
2512
2513 static struct reiserfs_journal_list *alloc_journal_list(struct super_block *s)
2514 {
2515 struct reiserfs_journal_list *jl;
2516 jl = kzalloc(sizeof(struct reiserfs_journal_list),
2517 GFP_NOFS | __GFP_NOFAIL);
2518 INIT_LIST_HEAD(&jl->j_list);
2519 INIT_LIST_HEAD(&jl->j_working_list);
2520 INIT_LIST_HEAD(&jl->j_tail_bh_list);
2521 INIT_LIST_HEAD(&jl->j_bh_list);
2522 mutex_init(&jl->j_commit_mutex);
2523 SB_JOURNAL(s)->j_num_lists++;
2524 get_journal_list(jl);
2525 return jl;
2526 }
2527
2528 static void journal_list_init(struct super_block *sb)
2529 {
2530 SB_JOURNAL(sb)->j_current_jl = alloc_journal_list(sb);
2531 }
2532
2533 static int release_journal_dev(struct super_block *super,
2534 struct reiserfs_journal *journal)
2535 {
2536 int result;
2537
2538 result = 0;
2539
2540 if (journal->j_dev_bd != NULL) {
2541 result = blkdev_put(journal->j_dev_bd, journal->j_dev_mode);
2542 journal->j_dev_bd = NULL;
2543 }
2544
2545 if (result != 0) {
2546 reiserfs_warning(super, "sh-457",
2547 "Cannot release journal device: %i", result);
2548 }
2549 return result;
2550 }
2551
2552 static int journal_init_dev(struct super_block *super,
2553 struct reiserfs_journal *journal,
2554 const char *jdev_name)
2555 {
2556 int result;
2557 dev_t jdev;
2558 fmode_t blkdev_mode = FMODE_READ | FMODE_WRITE | FMODE_EXCL;
2559 char b[BDEVNAME_SIZE];
2560
2561 result = 0;
2562
2563 journal->j_dev_bd = NULL;
2564 jdev = SB_ONDISK_JOURNAL_DEVICE(super) ?
2565 new_decode_dev(SB_ONDISK_JOURNAL_DEVICE(super)) : super->s_dev;
2566
2567 if (bdev_read_only(super->s_bdev))
2568 blkdev_mode = FMODE_READ;
2569
2570 /* there is no "jdev" option and journal is on separate device */
2571 if ((!jdev_name || !jdev_name[0])) {
2572 if (jdev == super->s_dev)
2573 blkdev_mode &= ~FMODE_EXCL;
2574 journal->j_dev_bd = blkdev_get_by_dev(jdev, blkdev_mode,
2575 journal);
2576 journal->j_dev_mode = blkdev_mode;
2577 if (IS_ERR(journal->j_dev_bd)) {
2578 result = PTR_ERR(journal->j_dev_bd);
2579 journal->j_dev_bd = NULL;
2580 reiserfs_warning(super, "sh-458",
2581 "cannot init journal device '%s': %i",
2582 __bdevname(jdev, b), result);
2583 return result;
2584 } else if (jdev != super->s_dev)
2585 set_blocksize(journal->j_dev_bd, super->s_blocksize);
2586
2587 return 0;
2588 }
2589
2590 journal->j_dev_mode = blkdev_mode;
2591 journal->j_dev_bd = blkdev_get_by_path(jdev_name, blkdev_mode, journal);
2592 if (IS_ERR(journal->j_dev_bd)) {
2593 result = PTR_ERR(journal->j_dev_bd);
2594 journal->j_dev_bd = NULL;
2595 reiserfs_warning(super,
2596 "journal_init_dev: Cannot open '%s': %i",
2597 jdev_name, result);
2598 return result;
2599 }
2600
2601 set_blocksize(journal->j_dev_bd, super->s_blocksize);
2602 reiserfs_info(super,
2603 "journal_init_dev: journal device: %s\n",
2604 bdevname(journal->j_dev_bd, b));
2605 return 0;
2606 }
2607
2608 /**
2609 * When creating/tuning a file system user can assign some
2610 * journal params within boundaries which depend on the ratio
2611 * blocksize/standard_blocksize.
2612 *
2613 * For blocks >= standard_blocksize transaction size should
2614 * be not less then JOURNAL_TRANS_MIN_DEFAULT, and not more
2615 * then JOURNAL_TRANS_MAX_DEFAULT.
2616 *
2617 * For blocks < standard_blocksize these boundaries should be
2618 * decreased proportionally.
2619 */
2620 #define REISERFS_STANDARD_BLKSIZE (4096)
2621
2622 static int check_advise_trans_params(struct super_block *sb,
2623 struct reiserfs_journal *journal)
2624 {
2625 if (journal->j_trans_max) {
2626 /* Non-default journal params.
2627 Do sanity check for them. */
2628 int ratio = 1;
2629 if (sb->s_blocksize < REISERFS_STANDARD_BLKSIZE)
2630 ratio = REISERFS_STANDARD_BLKSIZE / sb->s_blocksize;
2631
2632 if (journal->j_trans_max > JOURNAL_TRANS_MAX_DEFAULT / ratio ||
2633 journal->j_trans_max < JOURNAL_TRANS_MIN_DEFAULT / ratio ||
2634 SB_ONDISK_JOURNAL_SIZE(sb) / journal->j_trans_max <
2635 JOURNAL_MIN_RATIO) {
2636 reiserfs_warning(sb, "sh-462",
2637 "bad transaction max size (%u). "
2638 "FSCK?", journal->j_trans_max);
2639 return 1;
2640 }
2641 if (journal->j_max_batch != (journal->j_trans_max) *
2642 JOURNAL_MAX_BATCH_DEFAULT/JOURNAL_TRANS_MAX_DEFAULT) {
2643 reiserfs_warning(sb, "sh-463",
2644 "bad transaction max batch (%u). "
2645 "FSCK?", journal->j_max_batch);
2646 return 1;
2647 }
2648 } else {
2649 /* Default journal params.
2650 The file system was created by old version
2651 of mkreiserfs, so some fields contain zeros,
2652 and we need to advise proper values for them */
2653 if (sb->s_blocksize != REISERFS_STANDARD_BLKSIZE) {
2654 reiserfs_warning(sb, "sh-464", "bad blocksize (%u)",
2655 sb->s_blocksize);
2656 return 1;
2657 }
2658 journal->j_trans_max = JOURNAL_TRANS_MAX_DEFAULT;
2659 journal->j_max_batch = JOURNAL_MAX_BATCH_DEFAULT;
2660 journal->j_max_commit_age = JOURNAL_MAX_COMMIT_AGE;
2661 }
2662 return 0;
2663 }
2664
2665 /*
2666 ** must be called once on fs mount. calls journal_read for you
2667 */
2668 int journal_init(struct super_block *sb, const char *j_dev_name,
2669 int old_format, unsigned int commit_max_age)
2670 {
2671 int num_cnodes = SB_ONDISK_JOURNAL_SIZE(sb) * 2;
2672 struct buffer_head *bhjh;
2673 struct reiserfs_super_block *rs;
2674 struct reiserfs_journal_header *jh;
2675 struct reiserfs_journal *journal;
2676 struct reiserfs_journal_list *jl;
2677 char b[BDEVNAME_SIZE];
2678 int ret;
2679
2680 journal = SB_JOURNAL(sb) = vzalloc(sizeof(struct reiserfs_journal));
2681 if (!journal) {
2682 reiserfs_warning(sb, "journal-1256",
2683 "unable to get memory for journal structure");
2684 return 1;
2685 }
2686 INIT_LIST_HEAD(&journal->j_bitmap_nodes);
2687 INIT_LIST_HEAD(&journal->j_prealloc_list);
2688 INIT_LIST_HEAD(&journal->j_working_list);
2689 INIT_LIST_HEAD(&journal->j_journal_list);
2690 journal->j_persistent_trans = 0;
2691 if (reiserfs_allocate_list_bitmaps(sb, journal->j_list_bitmap,
2692 reiserfs_bmap_count(sb)))
2693 goto free_and_return;
2694
2695 allocate_bitmap_nodes(sb);
2696
2697 /* reserved for journal area support */
2698 SB_JOURNAL_1st_RESERVED_BLOCK(sb) = (old_format ?
2699 REISERFS_OLD_DISK_OFFSET_IN_BYTES
2700 / sb->s_blocksize +
2701 reiserfs_bmap_count(sb) +
2702 1 :
2703 REISERFS_DISK_OFFSET_IN_BYTES /
2704 sb->s_blocksize + 2);
2705
2706 /* Sanity check to see is the standard journal fitting within first bitmap
2707 (actual for small blocksizes) */
2708 if (!SB_ONDISK_JOURNAL_DEVICE(sb) &&
2709 (SB_JOURNAL_1st_RESERVED_BLOCK(sb) +
2710 SB_ONDISK_JOURNAL_SIZE(sb) > sb->s_blocksize * 8)) {
2711 reiserfs_warning(sb, "journal-1393",
2712 "journal does not fit for area addressed "
2713 "by first of bitmap blocks. It starts at "
2714 "%u and its size is %u. Block size %ld",
2715 SB_JOURNAL_1st_RESERVED_BLOCK(sb),
2716 SB_ONDISK_JOURNAL_SIZE(sb),
2717 sb->s_blocksize);
2718 goto free_and_return;
2719 }
2720
2721 if (journal_init_dev(sb, journal, j_dev_name) != 0) {
2722 reiserfs_warning(sb, "sh-462",
2723 "unable to initialize jornal device");
2724 goto free_and_return;
2725 }
2726
2727 rs = SB_DISK_SUPER_BLOCK(sb);
2728
2729 /* read journal header */
2730 bhjh = journal_bread(sb,
2731 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2732 SB_ONDISK_JOURNAL_SIZE(sb));
2733 if (!bhjh) {
2734 reiserfs_warning(sb, "sh-459",
2735 "unable to read journal header");
2736 goto free_and_return;
2737 }
2738 jh = (struct reiserfs_journal_header *)(bhjh->b_data);
2739
2740 /* make sure that journal matches to the super block */
2741 if (is_reiserfs_jr(rs)
2742 && (le32_to_cpu(jh->jh_journal.jp_journal_magic) !=
2743 sb_jp_journal_magic(rs))) {
2744 reiserfs_warning(sb, "sh-460",
2745 "journal header magic %x (device %s) does "
2746 "not match to magic found in super block %x",
2747 jh->jh_journal.jp_journal_magic,
2748 bdevname(journal->j_dev_bd, b),
2749 sb_jp_journal_magic(rs));
2750 brelse(bhjh);
2751 goto free_and_return;
2752 }
2753
2754 journal->j_trans_max = le32_to_cpu(jh->jh_journal.jp_journal_trans_max);
2755 journal->j_max_batch = le32_to_cpu(jh->jh_journal.jp_journal_max_batch);
2756 journal->j_max_commit_age =
2757 le32_to_cpu(jh->jh_journal.jp_journal_max_commit_age);
2758 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
2759
2760 if (check_advise_trans_params(sb, journal) != 0)
2761 goto free_and_return;
2762 journal->j_default_max_commit_age = journal->j_max_commit_age;
2763
2764 if (commit_max_age != 0) {
2765 journal->j_max_commit_age = commit_max_age;
2766 journal->j_max_trans_age = commit_max_age;
2767 }
2768
2769 reiserfs_info(sb, "journal params: device %s, size %u, "
2770 "journal first block %u, max trans len %u, max batch %u, "
2771 "max commit age %u, max trans age %u\n",
2772 bdevname(journal->j_dev_bd, b),
2773 SB_ONDISK_JOURNAL_SIZE(sb),
2774 SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2775 journal->j_trans_max,
2776 journal->j_max_batch,
2777 journal->j_max_commit_age, journal->j_max_trans_age);
2778
2779 brelse(bhjh);
2780
2781 journal->j_list_bitmap_index = 0;
2782 journal_list_init(sb);
2783
2784 memset(journal->j_list_hash_table, 0,
2785 JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *));
2786
2787 INIT_LIST_HEAD(&journal->j_dirty_buffers);
2788 spin_lock_init(&journal->j_dirty_buffers_lock);
2789
2790 journal->j_start = 0;
2791 journal->j_len = 0;
2792 journal->j_len_alloc = 0;
2793 atomic_set(&(journal->j_wcount), 0);
2794 atomic_set(&(journal->j_async_throttle), 0);
2795 journal->j_bcount = 0;
2796 journal->j_trans_start_time = 0;
2797 journal->j_last = NULL;
2798 journal->j_first = NULL;
2799 init_waitqueue_head(&(journal->j_join_wait));
2800 mutex_init(&journal->j_mutex);
2801 mutex_init(&journal->j_flush_mutex);
2802
2803 journal->j_trans_id = 10;
2804 journal->j_mount_id = 10;
2805 journal->j_state = 0;
2806 atomic_set(&(journal->j_jlock), 0);
2807 journal->j_cnode_free_list = allocate_cnodes(num_cnodes);
2808 journal->j_cnode_free_orig = journal->j_cnode_free_list;
2809 journal->j_cnode_free = journal->j_cnode_free_list ? num_cnodes : 0;
2810 journal->j_cnode_used = 0;
2811 journal->j_must_wait = 0;
2812
2813 if (journal->j_cnode_free == 0) {
2814 reiserfs_warning(sb, "journal-2004", "Journal cnode memory "
2815 "allocation failed (%ld bytes). Journal is "
2816 "too large for available memory. Usually "
2817 "this is due to a journal that is too large.",
2818 sizeof (struct reiserfs_journal_cnode) * num_cnodes);
2819 goto free_and_return;
2820 }
2821
2822 init_journal_hash(sb);
2823 jl = journal->j_current_jl;
2824
2825 /*
2826 * get_list_bitmap() may call flush_commit_list() which
2827 * requires the lock. Calling flush_commit_list() shouldn't happen
2828 * this early but I like to be paranoid.
2829 */
2830 reiserfs_write_lock(sb);
2831 jl->j_list_bitmap = get_list_bitmap(sb, jl);
2832 reiserfs_write_unlock(sb);
2833 if (!jl->j_list_bitmap) {
2834 reiserfs_warning(sb, "journal-2005",
2835 "get_list_bitmap failed for journal list 0");
2836 goto free_and_return;
2837 }
2838
2839 /*
2840 * Journal_read needs to be inspected in order to push down
2841 * the lock further inside (or even remove it).
2842 */
2843 reiserfs_write_lock(sb);
2844 ret = journal_read(sb);
2845 reiserfs_write_unlock(sb);
2846 if (ret < 0) {
2847 reiserfs_warning(sb, "reiserfs-2006",
2848 "Replay Failure, unable to mount");
2849 goto free_and_return;
2850 }
2851
2852 reiserfs_mounted_fs_count++;
2853 if (reiserfs_mounted_fs_count <= 1)
2854 commit_wq = alloc_workqueue("reiserfs", WQ_MEM_RECLAIM, 0);
2855
2856 INIT_DELAYED_WORK(&journal->j_work, flush_async_commits);
2857 journal->j_work_sb = sb;
2858 return 0;
2859 free_and_return:
2860 free_journal_ram(sb);
2861 return 1;
2862 }
2863
2864 /*
2865 ** test for a polite end of the current transaction. Used by file_write, and should
2866 ** be used by delete to make sure they don't write more than can fit inside a single
2867 ** transaction
2868 */
2869 int journal_transaction_should_end(struct reiserfs_transaction_handle *th,
2870 int new_alloc)
2871 {
2872 struct reiserfs_journal *journal = SB_JOURNAL(th->t_super);
2873 time_t now = get_seconds();
2874 /* cannot restart while nested */
2875 BUG_ON(!th->t_trans_id);
2876 if (th->t_refcount > 1)
2877 return 0;
2878 if (journal->j_must_wait > 0 ||
2879 (journal->j_len_alloc + new_alloc) >= journal->j_max_batch ||
2880 atomic_read(&(journal->j_jlock)) ||
2881 (now - journal->j_trans_start_time) > journal->j_max_trans_age ||
2882 journal->j_cnode_free < (journal->j_trans_max * 3)) {
2883 return 1;
2884 }
2885
2886 journal->j_len_alloc += new_alloc;
2887 th->t_blocks_allocated += new_alloc ;
2888 return 0;
2889 }
2890
2891 /* this must be called inside a transaction
2892 */
2893 void reiserfs_block_writes(struct reiserfs_transaction_handle *th)
2894 {
2895 struct reiserfs_journal *journal = SB_JOURNAL(th->t_super);
2896 BUG_ON(!th->t_trans_id);
2897 journal->j_must_wait = 1;
2898 set_bit(J_WRITERS_BLOCKED, &journal->j_state);
2899 return;
2900 }
2901
2902 /* this must be called without a transaction started
2903 */
2904 void reiserfs_allow_writes(struct super_block *s)
2905 {
2906 struct reiserfs_journal *journal = SB_JOURNAL(s);
2907 clear_bit(J_WRITERS_BLOCKED, &journal->j_state);
2908 wake_up(&journal->j_join_wait);
2909 }
2910
2911 /* this must be called without a transaction started
2912 */
2913 void reiserfs_wait_on_write_block(struct super_block *s)
2914 {
2915 struct reiserfs_journal *journal = SB_JOURNAL(s);
2916 wait_event(journal->j_join_wait,
2917 !test_bit(J_WRITERS_BLOCKED, &journal->j_state));
2918 }
2919
2920 static void queue_log_writer(struct super_block *s)
2921 {
2922 wait_queue_t wait;
2923 struct reiserfs_journal *journal = SB_JOURNAL(s);
2924 set_bit(J_WRITERS_QUEUED, &journal->j_state);
2925
2926 /*
2927 * we don't want to use wait_event here because
2928 * we only want to wait once.
2929 */
2930 init_waitqueue_entry(&wait, current);
2931 add_wait_queue(&journal->j_join_wait, &wait);
2932 set_current_state(TASK_UNINTERRUPTIBLE);
2933 if (test_bit(J_WRITERS_QUEUED, &journal->j_state)) {
2934 reiserfs_write_unlock(s);
2935 schedule();
2936 reiserfs_write_lock(s);
2937 }
2938 __set_current_state(TASK_RUNNING);
2939 remove_wait_queue(&journal->j_join_wait, &wait);
2940 }
2941
2942 static void wake_queued_writers(struct super_block *s)
2943 {
2944 struct reiserfs_journal *journal = SB_JOURNAL(s);
2945 if (test_and_clear_bit(J_WRITERS_QUEUED, &journal->j_state))
2946 wake_up(&journal->j_join_wait);
2947 }
2948
2949 static void let_transaction_grow(struct super_block *sb, unsigned int trans_id)
2950 {
2951 struct reiserfs_journal *journal = SB_JOURNAL(sb);
2952 unsigned long bcount = journal->j_bcount;
2953 while (1) {
2954 reiserfs_write_unlock(sb);
2955 schedule_timeout_uninterruptible(1);
2956 reiserfs_write_lock(sb);
2957 journal->j_current_jl->j_state |= LIST_COMMIT_PENDING;
2958 while ((atomic_read(&journal->j_wcount) > 0 ||
2959 atomic_read(&journal->j_jlock)) &&
2960 journal->j_trans_id == trans_id) {
2961 queue_log_writer(sb);
2962 }
2963 if (journal->j_trans_id != trans_id)
2964 break;
2965 if (bcount == journal->j_bcount)
2966 break;
2967 bcount = journal->j_bcount;
2968 }
2969 }
2970
2971 /* join == true if you must join an existing transaction.
2972 ** join == false if you can deal with waiting for others to finish
2973 **
2974 ** this will block until the transaction is joinable. send the number of blocks you
2975 ** expect to use in nblocks.
2976 */
2977 static int do_journal_begin_r(struct reiserfs_transaction_handle *th,
2978 struct super_block *sb, unsigned long nblocks,
2979 int join)
2980 {
2981 time_t now = get_seconds();
2982 unsigned int old_trans_id;
2983 struct reiserfs_journal *journal = SB_JOURNAL(sb);
2984 struct reiserfs_transaction_handle myth;
2985 int sched_count = 0;
2986 int retval;
2987
2988 reiserfs_check_lock_depth(sb, "journal_begin");
2989 BUG_ON(nblocks > journal->j_trans_max);
2990
2991 PROC_INFO_INC(sb, journal.journal_being);
2992 /* set here for journal_join */
2993 th->t_refcount = 1;
2994 th->t_super = sb;
2995
2996 relock:
2997 lock_journal(sb);
2998 if (join != JBEGIN_ABORT && reiserfs_is_journal_aborted(journal)) {
2999 unlock_journal(sb);
3000 retval = journal->j_errno;
3001 goto out_fail;
3002 }
3003 journal->j_bcount++;
3004
3005 if (test_bit(J_WRITERS_BLOCKED, &journal->j_state)) {
3006 unlock_journal(sb);
3007 reiserfs_write_unlock(sb);
3008 reiserfs_wait_on_write_block(sb);
3009 reiserfs_write_lock(sb);
3010 PROC_INFO_INC(sb, journal.journal_relock_writers);
3011 goto relock;
3012 }
3013 now = get_seconds();
3014
3015 /* if there is no room in the journal OR
3016 ** if this transaction is too old, and we weren't called joinable, wait for it to finish before beginning
3017 ** we don't sleep if there aren't other writers
3018 */
3019
3020 if ((!join && journal->j_must_wait > 0) ||
3021 (!join
3022 && (journal->j_len_alloc + nblocks + 2) >= journal->j_max_batch)
3023 || (!join && atomic_read(&journal->j_wcount) > 0
3024 && journal->j_trans_start_time > 0
3025 && (now - journal->j_trans_start_time) >
3026 journal->j_max_trans_age) || (!join
3027 && atomic_read(&journal->j_jlock))
3028 || (!join && journal->j_cnode_free < (journal->j_trans_max * 3))) {
3029
3030 old_trans_id = journal->j_trans_id;
3031 unlock_journal(sb); /* allow others to finish this transaction */
3032
3033 if (!join && (journal->j_len_alloc + nblocks + 2) >=
3034 journal->j_max_batch &&
3035 ((journal->j_len + nblocks + 2) * 100) <
3036 (journal->j_len_alloc * 75)) {
3037 if (atomic_read(&journal->j_wcount) > 10) {
3038 sched_count++;
3039 queue_log_writer(sb);
3040 goto relock;
3041 }
3042 }
3043 /* don't mess with joining the transaction if all we have to do is
3044 * wait for someone else to do a commit
3045 */
3046 if (atomic_read(&journal->j_jlock)) {
3047 while (journal->j_trans_id == old_trans_id &&
3048 atomic_read(&journal->j_jlock)) {
3049 queue_log_writer(sb);
3050 }
3051 goto relock;
3052 }
3053 retval = journal_join(&myth, sb, 1);
3054 if (retval)
3055 goto out_fail;
3056
3057 /* someone might have ended the transaction while we joined */
3058 if (old_trans_id != journal->j_trans_id) {
3059 retval = do_journal_end(&myth, sb, 1, 0);
3060 } else {
3061 retval = do_journal_end(&myth, sb, 1, COMMIT_NOW);
3062 }
3063
3064 if (retval)
3065 goto out_fail;
3066
3067 PROC_INFO_INC(sb, journal.journal_relock_wcount);
3068 goto relock;
3069 }
3070 /* we are the first writer, set trans_id */
3071 if (journal->j_trans_start_time == 0) {
3072 journal->j_trans_start_time = get_seconds();
3073 }
3074 atomic_inc(&(journal->j_wcount));
3075 journal->j_len_alloc += nblocks;
3076 th->t_blocks_logged = 0;
3077 th->t_blocks_allocated = nblocks;
3078 th->t_trans_id = journal->j_trans_id;
3079 unlock_journal(sb);
3080 INIT_LIST_HEAD(&th->t_list);
3081 return 0;
3082
3083 out_fail:
3084 memset(th, 0, sizeof(*th));
3085 /* Re-set th->t_super, so we can properly keep track of how many
3086 * persistent transactions there are. We need to do this so if this
3087 * call is part of a failed restart_transaction, we can free it later */
3088 th->t_super = sb;
3089 return retval;
3090 }
3091
3092 struct reiserfs_transaction_handle *reiserfs_persistent_transaction(struct
3093 super_block
3094 *s,
3095 int nblocks)
3096 {
3097 int ret;
3098 struct reiserfs_transaction_handle *th;
3099
3100 /* if we're nesting into an existing transaction. It will be
3101 ** persistent on its own
3102 */
3103 if (reiserfs_transaction_running(s)) {
3104 th = current->journal_info;
3105 th->t_refcount++;
3106 BUG_ON(th->t_refcount < 2);
3107
3108 return th;
3109 }
3110 th = kmalloc(sizeof(struct reiserfs_transaction_handle), GFP_NOFS);
3111 if (!th)
3112 return NULL;
3113 ret = journal_begin(th, s, nblocks);
3114 if (ret) {
3115 kfree(th);
3116 return NULL;
3117 }
3118
3119 SB_JOURNAL(s)->j_persistent_trans++;
3120 return th;
3121 }
3122
3123 int reiserfs_end_persistent_transaction(struct reiserfs_transaction_handle *th)
3124 {
3125 struct super_block *s = th->t_super;
3126 int ret = 0;
3127 if (th->t_trans_id)
3128 ret = journal_end(th, th->t_super, th->t_blocks_allocated);
3129 else
3130 ret = -EIO;
3131 if (th->t_refcount == 0) {
3132 SB_JOURNAL(s)->j_persistent_trans--;
3133 kfree(th);
3134 }
3135 return ret;
3136 }
3137
3138 static int journal_join(struct reiserfs_transaction_handle *th,
3139 struct super_block *sb, unsigned long nblocks)
3140 {
3141 struct reiserfs_transaction_handle *cur_th = current->journal_info;
3142
3143 /* this keeps do_journal_end from NULLing out the current->journal_info
3144 ** pointer
3145 */
3146 th->t_handle_save = cur_th;
3147 BUG_ON(cur_th && cur_th->t_refcount > 1);
3148 return do_journal_begin_r(th, sb, nblocks, JBEGIN_JOIN);
3149 }
3150
3151 int journal_join_abort(struct reiserfs_transaction_handle *th,
3152 struct super_block *sb, unsigned long nblocks)
3153 {
3154 struct reiserfs_transaction_handle *cur_th = current->journal_info;
3155
3156 /* this keeps do_journal_end from NULLing out the current->journal_info
3157 ** pointer
3158 */
3159 th->t_handle_save = cur_th;
3160 BUG_ON(cur_th && cur_th->t_refcount > 1);
3161 return do_journal_begin_r(th, sb, nblocks, JBEGIN_ABORT);
3162 }
3163
3164 int journal_begin(struct reiserfs_transaction_handle *th,
3165 struct super_block *sb, unsigned long nblocks)
3166 {
3167 struct reiserfs_transaction_handle *cur_th = current->journal_info;
3168 int ret;
3169
3170 th->t_handle_save = NULL;
3171 if (cur_th) {
3172 /* we are nesting into the current transaction */
3173 if (cur_th->t_super == sb) {
3174 BUG_ON(!cur_th->t_refcount);
3175 cur_th->t_refcount++;
3176 memcpy(th, cur_th, sizeof(*th));
3177 if (th->t_refcount <= 1)
3178 reiserfs_warning(sb, "reiserfs-2005",
3179 "BAD: refcount <= 1, but "
3180 "journal_info != 0");
3181 return 0;
3182 } else {
3183 /* we've ended up with a handle from a different filesystem.
3184 ** save it and restore on journal_end. This should never
3185 ** really happen...
3186 */
3187 reiserfs_warning(sb, "clm-2100",
3188 "nesting info a different FS");
3189 th->t_handle_save = current->journal_info;
3190 current->journal_info = th;
3191 }
3192 } else {
3193 current->journal_info = th;
3194 }
3195 ret = do_journal_begin_r(th, sb, nblocks, JBEGIN_REG);
3196 BUG_ON(current->journal_info != th);
3197
3198 /* I guess this boils down to being the reciprocal of clm-2100 above.
3199 * If do_journal_begin_r fails, we need to put it back, since journal_end
3200 * won't be called to do it. */
3201 if (ret)
3202 current->journal_info = th->t_handle_save;
3203 else
3204 BUG_ON(!th->t_refcount);
3205
3206 return ret;
3207 }
3208
3209 /*
3210 ** puts bh into the current transaction. If it was already there, reorders removes the
3211 ** old pointers from the hash, and puts new ones in (to make sure replay happen in the right order).
3212 **
3213 ** if it was dirty, cleans and files onto the clean list. I can't let it be dirty again until the
3214 ** transaction is committed.
3215 **
3216 ** if j_len, is bigger than j_len_alloc, it pushes j_len_alloc to 10 + j_len.
3217 */
3218 int journal_mark_dirty(struct reiserfs_transaction_handle *th,
3219 struct super_block *sb, struct buffer_head *bh)
3220 {
3221 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3222 struct reiserfs_journal_cnode *cn = NULL;
3223 int count_already_incd = 0;
3224 int prepared = 0;
3225 BUG_ON(!th->t_trans_id);
3226
3227 PROC_INFO_INC(sb, journal.mark_dirty);
3228 if (th->t_trans_id != journal->j_trans_id) {
3229 reiserfs_panic(th->t_super, "journal-1577",
3230 "handle trans id %ld != current trans id %ld",
3231 th->t_trans_id, journal->j_trans_id);
3232 }
3233
3234 sb->s_dirt = 1;
3235
3236 prepared = test_clear_buffer_journal_prepared(bh);
3237 clear_buffer_journal_restore_dirty(bh);
3238 /* already in this transaction, we are done */
3239 if (buffer_journaled(bh)) {
3240 PROC_INFO_INC(sb, journal.mark_dirty_already);
3241 return 0;
3242 }
3243
3244 /* this must be turned into a panic instead of a warning. We can't allow
3245 ** a dirty or journal_dirty or locked buffer to be logged, as some changes
3246 ** could get to disk too early. NOT GOOD.
3247 */
3248 if (!prepared || buffer_dirty(bh)) {
3249 reiserfs_warning(sb, "journal-1777",
3250 "buffer %llu bad state "
3251 "%cPREPARED %cLOCKED %cDIRTY %cJDIRTY_WAIT",
3252 (unsigned long long)bh->b_blocknr,
3253 prepared ? ' ' : '!',
3254 buffer_locked(bh) ? ' ' : '!',
3255 buffer_dirty(bh) ? ' ' : '!',
3256 buffer_journal_dirty(bh) ? ' ' : '!');
3257 }
3258
3259 if (atomic_read(&(journal->j_wcount)) <= 0) {
3260 reiserfs_warning(sb, "journal-1409",
3261 "returning because j_wcount was %d",
3262 atomic_read(&(journal->j_wcount)));
3263 return 1;
3264 }
3265 /* this error means I've screwed up, and we've overflowed the transaction.
3266 ** Nothing can be done here, except make the FS readonly or panic.
3267 */
3268 if (journal->j_len >= journal->j_trans_max) {
3269 reiserfs_panic(th->t_super, "journal-1413",
3270 "j_len (%lu) is too big",
3271 journal->j_len);
3272 }
3273
3274 if (buffer_journal_dirty(bh)) {
3275 count_already_incd = 1;
3276 PROC_INFO_INC(sb, journal.mark_dirty_notjournal);
3277 clear_buffer_journal_dirty(bh);
3278 }
3279
3280 if (journal->j_len > journal->j_len_alloc) {
3281 journal->j_len_alloc = journal->j_len + JOURNAL_PER_BALANCE_CNT;
3282 }
3283
3284 set_buffer_journaled(bh);
3285
3286 /* now put this guy on the end */
3287 if (!cn) {
3288 cn = get_cnode(sb);
3289 if (!cn) {
3290 reiserfs_panic(sb, "journal-4", "get_cnode failed!");
3291 }
3292
3293 if (th->t_blocks_logged == th->t_blocks_allocated) {
3294 th->t_blocks_allocated += JOURNAL_PER_BALANCE_CNT;
3295 journal->j_len_alloc += JOURNAL_PER_BALANCE_CNT;
3296 }
3297 th->t_blocks_logged++;
3298 journal->j_len++;
3299
3300 cn->bh = bh;
3301 cn->blocknr = bh->b_blocknr;
3302 cn->sb = sb;
3303 cn->jlist = NULL;
3304 insert_journal_hash(journal->j_hash_table, cn);
3305 if (!count_already_incd) {
3306 get_bh(bh);
3307 }
3308 }
3309 cn->next = NULL;
3310 cn->prev = journal->j_last;
3311 cn->bh = bh;
3312 if (journal->j_last) {
3313 journal->j_last->next = cn;
3314 journal->j_last = cn;
3315 } else {
3316 journal->j_first = cn;
3317 journal->j_last = cn;
3318 }
3319 return 0;
3320 }
3321
3322 int journal_end(struct reiserfs_transaction_handle *th,
3323 struct super_block *sb, unsigned long nblocks)
3324 {
3325 if (!current->journal_info && th->t_refcount > 1)
3326 reiserfs_warning(sb, "REISER-NESTING",
3327 "th NULL, refcount %d", th->t_refcount);
3328
3329 if (!th->t_trans_id) {
3330 WARN_ON(1);
3331 return -EIO;
3332 }
3333
3334 th->t_refcount--;
3335 if (th->t_refcount > 0) {
3336 struct reiserfs_transaction_handle *cur_th =
3337 current->journal_info;
3338
3339 /* we aren't allowed to close a nested transaction on a different
3340 ** filesystem from the one in the task struct
3341 */
3342 BUG_ON(cur_th->t_super != th->t_super);
3343
3344 if (th != cur_th) {
3345 memcpy(current->journal_info, th, sizeof(*th));
3346 th->t_trans_id = 0;
3347 }
3348 return 0;
3349 } else {
3350 return do_journal_end(th, sb, nblocks, 0);
3351 }
3352 }
3353
3354 /* removes from the current transaction, relsing and descrementing any counters.
3355 ** also files the removed buffer directly onto the clean list
3356 **
3357 ** called by journal_mark_freed when a block has been deleted
3358 **
3359 ** returns 1 if it cleaned and relsed the buffer. 0 otherwise
3360 */
3361 static int remove_from_transaction(struct super_block *sb,
3362 b_blocknr_t blocknr, int already_cleaned)
3363 {
3364 struct buffer_head *bh;
3365 struct reiserfs_journal_cnode *cn;
3366 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3367 int ret = 0;
3368
3369 cn = get_journal_hash_dev(sb, journal->j_hash_table, blocknr);
3370 if (!cn || !cn->bh) {
3371 return ret;
3372 }
3373 bh = cn->bh;
3374 if (cn->prev) {
3375 cn->prev->next = cn->next;
3376 }
3377 if (cn->next) {
3378 cn->next->prev = cn->prev;
3379 }
3380 if (cn == journal->j_first) {
3381 journal->j_first = cn->next;
3382 }
3383 if (cn == journal->j_last) {
3384 journal->j_last = cn->prev;
3385 }
3386 if (bh)
3387 remove_journal_hash(sb, journal->j_hash_table, NULL,
3388 bh->b_blocknr, 0);
3389 clear_buffer_journaled(bh); /* don't log this one */
3390
3391 if (!already_cleaned) {
3392 clear_buffer_journal_dirty(bh);
3393 clear_buffer_dirty(bh);
3394 clear_buffer_journal_test(bh);
3395 put_bh(bh);
3396 if (atomic_read(&(bh->b_count)) < 0) {
3397 reiserfs_warning(sb, "journal-1752",
3398 "b_count < 0");
3399 }
3400 ret = 1;
3401 }
3402 journal->j_len--;
3403 journal->j_len_alloc--;
3404 free_cnode(sb, cn);
3405 return ret;
3406 }
3407
3408 /*
3409 ** for any cnode in a journal list, it can only be dirtied of all the
3410 ** transactions that include it are committed to disk.
3411 ** this checks through each transaction, and returns 1 if you are allowed to dirty,
3412 ** and 0 if you aren't
3413 **
3414 ** it is called by dirty_journal_list, which is called after flush_commit_list has gotten all the log
3415 ** blocks for a given transaction on disk
3416 **
3417 */
3418 static int can_dirty(struct reiserfs_journal_cnode *cn)
3419 {
3420 struct super_block *sb = cn->sb;
3421 b_blocknr_t blocknr = cn->blocknr;
3422 struct reiserfs_journal_cnode *cur = cn->hprev;
3423 int can_dirty = 1;
3424
3425 /* first test hprev. These are all newer than cn, so any node here
3426 ** with the same block number and dev means this node can't be sent
3427 ** to disk right now.
3428 */
3429 while (cur && can_dirty) {
3430 if (cur->jlist && cur->bh && cur->blocknr && cur->sb == sb &&
3431 cur->blocknr == blocknr) {
3432 can_dirty = 0;
3433 }
3434 cur = cur->hprev;
3435 }
3436 /* then test hnext. These are all older than cn. As long as they
3437 ** are committed to the log, it is safe to write cn to disk
3438 */
3439 cur = cn->hnext;
3440 while (cur && can_dirty) {
3441 if (cur->jlist && cur->jlist->j_len > 0 &&
3442 atomic_read(&(cur->jlist->j_commit_left)) > 0 && cur->bh &&
3443 cur->blocknr && cur->sb == sb && cur->blocknr == blocknr) {
3444 can_dirty = 0;
3445 }
3446 cur = cur->hnext;
3447 }
3448 return can_dirty;
3449 }
3450
3451 /* syncs the commit blocks, but does not force the real buffers to disk
3452 ** will wait until the current transaction is done/committed before returning
3453 */
3454 int journal_end_sync(struct reiserfs_transaction_handle *th,
3455 struct super_block *sb, unsigned long nblocks)
3456 {
3457 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3458
3459 BUG_ON(!th->t_trans_id);
3460 /* you can sync while nested, very, very bad */
3461 BUG_ON(th->t_refcount > 1);
3462 if (journal->j_len == 0) {
3463 reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
3464 1);
3465 journal_mark_dirty(th, sb, SB_BUFFER_WITH_SB(sb));
3466 }
3467 return do_journal_end(th, sb, nblocks, COMMIT_NOW | WAIT);
3468 }
3469
3470 /*
3471 ** writeback the pending async commits to disk
3472 */
3473 static void flush_async_commits(struct work_struct *work)
3474 {
3475 struct reiserfs_journal *journal =
3476 container_of(work, struct reiserfs_journal, j_work.work);
3477 struct super_block *sb = journal->j_work_sb;
3478 struct reiserfs_journal_list *jl;
3479 struct list_head *entry;
3480
3481 reiserfs_write_lock(sb);
3482 if (!list_empty(&journal->j_journal_list)) {
3483 /* last entry is the youngest, commit it and you get everything */
3484 entry = journal->j_journal_list.prev;
3485 jl = JOURNAL_LIST_ENTRY(entry);
3486 flush_commit_list(sb, jl, 1);
3487 }
3488 reiserfs_write_unlock(sb);
3489 }
3490
3491 /*
3492 ** flushes any old transactions to disk
3493 ** ends the current transaction if it is too old
3494 */
3495 int reiserfs_flush_old_commits(struct super_block *sb)
3496 {
3497 time_t now;
3498 struct reiserfs_transaction_handle th;
3499 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3500
3501 now = get_seconds();
3502 /* safety check so we don't flush while we are replaying the log during
3503 * mount
3504 */
3505 if (list_empty(&journal->j_journal_list)) {
3506 return 0;
3507 }
3508
3509 /* check the current transaction. If there are no writers, and it is
3510 * too old, finish it, and force the commit blocks to disk
3511 */
3512 if (atomic_read(&journal->j_wcount) <= 0 &&
3513 journal->j_trans_start_time > 0 &&
3514 journal->j_len > 0 &&
3515 (now - journal->j_trans_start_time) > journal->j_max_trans_age) {
3516 if (!journal_join(&th, sb, 1)) {
3517 reiserfs_prepare_for_journal(sb,
3518 SB_BUFFER_WITH_SB(sb),
3519 1);
3520 journal_mark_dirty(&th, sb,
3521 SB_BUFFER_WITH_SB(sb));
3522
3523 /* we're only being called from kreiserfsd, it makes no sense to do
3524 ** an async commit so that kreiserfsd can do it later
3525 */
3526 do_journal_end(&th, sb, 1, COMMIT_NOW | WAIT);
3527 }
3528 }
3529 return sb->s_dirt;
3530 }
3531
3532 /*
3533 ** returns 0 if do_journal_end should return right away, returns 1 if do_journal_end should finish the commit
3534 **
3535 ** if the current transaction is too old, but still has writers, this will wait on j_join_wait until all
3536 ** the writers are done. By the time it wakes up, the transaction it was called has already ended, so it just
3537 ** flushes the commit list and returns 0.
3538 **
3539 ** Won't batch when flush or commit_now is set. Also won't batch when others are waiting on j_join_wait.
3540 **
3541 ** Note, we can't allow the journal_end to proceed while there are still writers in the log.
3542 */
3543 static int check_journal_end(struct reiserfs_transaction_handle *th,
3544 struct super_block *sb, unsigned long nblocks,
3545 int flags)
3546 {
3547
3548 time_t now;
3549 int flush = flags & FLUSH_ALL;
3550 int commit_now = flags & COMMIT_NOW;
3551 int wait_on_commit = flags & WAIT;
3552 struct reiserfs_journal_list *jl;
3553 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3554
3555 BUG_ON(!th->t_trans_id);
3556
3557 if (th->t_trans_id != journal->j_trans_id) {
3558 reiserfs_panic(th->t_super, "journal-1577",
3559 "handle trans id %ld != current trans id %ld",
3560 th->t_trans_id, journal->j_trans_id);
3561 }
3562
3563 journal->j_len_alloc -= (th->t_blocks_allocated - th->t_blocks_logged);
3564 if (atomic_read(&(journal->j_wcount)) > 0) { /* <= 0 is allowed. unmounting might not call begin */
3565 atomic_dec(&(journal->j_wcount));
3566 }
3567
3568 /* BUG, deal with case where j_len is 0, but people previously freed blocks need to be released
3569 ** will be dealt with by next transaction that actually writes something, but should be taken
3570 ** care of in this trans
3571 */
3572 BUG_ON(journal->j_len == 0);
3573
3574 /* if wcount > 0, and we are called to with flush or commit_now,
3575 ** we wait on j_join_wait. We will wake up when the last writer has
3576 ** finished the transaction, and started it on its way to the disk.
3577 ** Then, we flush the commit or journal list, and just return 0
3578 ** because the rest of journal end was already done for this transaction.
3579 */
3580 if (atomic_read(&(journal->j_wcount)) > 0) {
3581 if (flush || commit_now) {
3582 unsigned trans_id;
3583
3584 jl = journal->j_current_jl;
3585 trans_id = jl->j_trans_id;
3586 if (wait_on_commit)
3587 jl->j_state |= LIST_COMMIT_PENDING;
3588 atomic_set(&(journal->j_jlock), 1);
3589 if (flush) {
3590 journal->j_next_full_flush = 1;
3591 }
3592 unlock_journal(sb);
3593
3594 /* sleep while the current transaction is still j_jlocked */
3595 while (journal->j_trans_id == trans_id) {
3596 if (atomic_read(&journal->j_jlock)) {
3597 queue_log_writer(sb);
3598 } else {
3599 lock_journal(sb);
3600 if (journal->j_trans_id == trans_id) {
3601 atomic_set(&(journal->j_jlock),
3602 1);
3603 }
3604 unlock_journal(sb);
3605 }
3606 }
3607 BUG_ON(journal->j_trans_id == trans_id);
3608
3609 if (commit_now
3610 && journal_list_still_alive(sb, trans_id)
3611 && wait_on_commit) {
3612 flush_commit_list(sb, jl, 1);
3613 }
3614 return 0;
3615 }
3616 unlock_journal(sb);
3617 return 0;
3618 }
3619
3620 /* deal with old transactions where we are the last writers */
3621 now = get_seconds();
3622 if ((now - journal->j_trans_start_time) > journal->j_max_trans_age) {
3623 commit_now = 1;
3624 journal->j_next_async_flush = 1;
3625 }
3626 /* don't batch when someone is waiting on j_join_wait */
3627 /* don't batch when syncing the commit or flushing the whole trans */
3628 if (!(journal->j_must_wait > 0) && !(atomic_read(&(journal->j_jlock)))
3629 && !flush && !commit_now && (journal->j_len < journal->j_max_batch)
3630 && journal->j_len_alloc < journal->j_max_batch
3631 && journal->j_cnode_free > (journal->j_trans_max * 3)) {
3632 journal->j_bcount++;
3633 unlock_journal(sb);
3634 return 0;
3635 }
3636
3637 if (journal->j_start > SB_ONDISK_JOURNAL_SIZE(sb)) {
3638 reiserfs_panic(sb, "journal-003",
3639 "j_start (%ld) is too high",
3640 journal->j_start);
3641 }
3642 return 1;
3643 }
3644
3645 /*
3646 ** Does all the work that makes deleting blocks safe.
3647 ** when deleting a block mark BH_JNew, just remove it from the current transaction, clean it's buffer_head and move on.
3648 **
3649 ** otherwise:
3650 ** set a bit for the block in the journal bitmap. That will prevent it from being allocated for unformatted nodes
3651 ** before this transaction has finished.
3652 **
3653 ** mark any cnodes for this block as BLOCK_FREED, and clear their bh pointers. That will prevent any old transactions with
3654 ** this block from trying to flush to the real location. Since we aren't removing the cnode from the journal_list_hash,
3655 ** the block can't be reallocated yet.
3656 **
3657 ** Then remove it from the current transaction, decrementing any counters and filing it on the clean list.
3658 */
3659 int journal_mark_freed(struct reiserfs_transaction_handle *th,
3660 struct super_block *sb, b_blocknr_t blocknr)
3661 {
3662 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3663 struct reiserfs_journal_cnode *cn = NULL;
3664 struct buffer_head *bh = NULL;
3665 struct reiserfs_list_bitmap *jb = NULL;
3666 int cleaned = 0;
3667 BUG_ON(!th->t_trans_id);
3668
3669 cn = get_journal_hash_dev(sb, journal->j_hash_table, blocknr);
3670 if (cn && cn->bh) {
3671 bh = cn->bh;
3672 get_bh(bh);
3673 }
3674 /* if it is journal new, we just remove it from this transaction */
3675 if (bh && buffer_journal_new(bh)) {
3676 clear_buffer_journal_new(bh);
3677 clear_prepared_bits(bh);
3678 reiserfs_clean_and_file_buffer(bh);
3679 cleaned = remove_from_transaction(sb, blocknr, cleaned);
3680 } else {
3681 /* set the bit for this block in the journal bitmap for this transaction */
3682 jb = journal->j_current_jl->j_list_bitmap;
3683 if (!jb) {
3684 reiserfs_panic(sb, "journal-1702",
3685 "journal_list_bitmap is NULL");
3686 }
3687 set_bit_in_list_bitmap(sb, blocknr, jb);
3688
3689 /* Note, the entire while loop is not allowed to schedule. */
3690
3691 if (bh) {
3692 clear_prepared_bits(bh);
3693 reiserfs_clean_and_file_buffer(bh);
3694 }
3695 cleaned = remove_from_transaction(sb, blocknr, cleaned);
3696
3697 /* find all older transactions with this block, make sure they don't try to write it out */
3698 cn = get_journal_hash_dev(sb, journal->j_list_hash_table,
3699 blocknr);
3700 while (cn) {
3701 if (sb == cn->sb && blocknr == cn->blocknr) {
3702 set_bit(BLOCK_FREED, &cn->state);
3703 if (cn->bh) {
3704 if (!cleaned) {
3705 /* remove_from_transaction will brelse the buffer if it was
3706 ** in the current trans
3707 */
3708 clear_buffer_journal_dirty(cn->
3709 bh);
3710 clear_buffer_dirty(cn->bh);
3711 clear_buffer_journal_test(cn->
3712 bh);
3713 cleaned = 1;
3714 put_bh(cn->bh);
3715 if (atomic_read
3716 (&(cn->bh->b_count)) < 0) {
3717 reiserfs_warning(sb,
3718 "journal-2138",
3719 "cn->bh->b_count < 0");
3720 }
3721 }
3722 if (cn->jlist) { /* since we are clearing the bh, we MUST dec nonzerolen */
3723 atomic_dec(&
3724 (cn->jlist->
3725 j_nonzerolen));
3726 }
3727 cn->bh = NULL;
3728 }
3729 }
3730 cn = cn->hnext;
3731 }
3732 }
3733
3734 if (bh)
3735 release_buffer_page(bh); /* get_hash grabs the buffer */
3736 return 0;
3737 }
3738
3739 void reiserfs_update_inode_transaction(struct inode *inode)
3740 {
3741 struct reiserfs_journal *journal = SB_JOURNAL(inode->i_sb);
3742 REISERFS_I(inode)->i_jl = journal->j_current_jl;
3743 REISERFS_I(inode)->i_trans_id = journal->j_trans_id;
3744 }
3745
3746 /*
3747 * returns -1 on error, 0 if no commits/barriers were done and 1
3748 * if a transaction was actually committed and the barrier was done
3749 */
3750 static int __commit_trans_jl(struct inode *inode, unsigned long id,
3751 struct reiserfs_journal_list *jl)
3752 {
3753 struct reiserfs_transaction_handle th;
3754 struct super_block *sb = inode->i_sb;
3755 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3756 int ret = 0;
3757
3758 /* is it from the current transaction, or from an unknown transaction? */
3759 if (id == journal->j_trans_id) {
3760 jl = journal->j_current_jl;
3761 /* try to let other writers come in and grow this transaction */
3762 let_transaction_grow(sb, id);
3763 if (journal->j_trans_id != id) {
3764 goto flush_commit_only;
3765 }
3766
3767 ret = journal_begin(&th, sb, 1);
3768 if (ret)
3769 return ret;
3770
3771 /* someone might have ended this transaction while we joined */
3772 if (journal->j_trans_id != id) {
3773 reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
3774 1);
3775 journal_mark_dirty(&th, sb, SB_BUFFER_WITH_SB(sb));
3776 ret = journal_end(&th, sb, 1);
3777 goto flush_commit_only;
3778 }
3779
3780 ret = journal_end_sync(&th, sb, 1);
3781 if (!ret)
3782 ret = 1;
3783
3784 } else {
3785 /* this gets tricky, we have to make sure the journal list in
3786 * the inode still exists. We know the list is still around
3787 * if we've got a larger transaction id than the oldest list
3788 */
3789 flush_commit_only:
3790 if (journal_list_still_alive(inode->i_sb, id)) {
3791 /*
3792 * we only set ret to 1 when we know for sure
3793 * the barrier hasn't been started yet on the commit
3794 * block.
3795 */
3796 if (atomic_read(&jl->j_commit_left) > 1)
3797 ret = 1;
3798 flush_commit_list(sb, jl, 1);
3799 if (journal->j_errno)
3800 ret = journal->j_errno;
3801 }
3802 }
3803 /* otherwise the list is gone, and long since committed */
3804 return ret;
3805 }
3806
3807 int reiserfs_commit_for_inode(struct inode *inode)
3808 {
3809 unsigned int id = REISERFS_I(inode)->i_trans_id;
3810 struct reiserfs_journal_list *jl = REISERFS_I(inode)->i_jl;
3811
3812 /* for the whole inode, assume unset id means it was
3813 * changed in the current transaction. More conservative
3814 */
3815 if (!id || !jl) {
3816 reiserfs_update_inode_transaction(inode);
3817 id = REISERFS_I(inode)->i_trans_id;
3818 /* jl will be updated in __commit_trans_jl */
3819 }
3820
3821 return __commit_trans_jl(inode, id, jl);
3822 }
3823
3824 void reiserfs_restore_prepared_buffer(struct super_block *sb,
3825 struct buffer_head *bh)
3826 {
3827 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3828 PROC_INFO_INC(sb, journal.restore_prepared);
3829 if (!bh) {
3830 return;
3831 }
3832 if (test_clear_buffer_journal_restore_dirty(bh) &&
3833 buffer_journal_dirty(bh)) {
3834 struct reiserfs_journal_cnode *cn;
3835 cn = get_journal_hash_dev(sb,
3836 journal->j_list_hash_table,
3837 bh->b_blocknr);
3838 if (cn && can_dirty(cn)) {
3839 set_buffer_journal_test(bh);
3840 mark_buffer_dirty(bh);
3841 }
3842 }
3843 clear_buffer_journal_prepared(bh);
3844 }
3845
3846 extern struct tree_balance *cur_tb;
3847 /*
3848 ** before we can change a metadata block, we have to make sure it won't
3849 ** be written to disk while we are altering it. So, we must:
3850 ** clean it
3851 ** wait on it.
3852 **
3853 */
3854 int reiserfs_prepare_for_journal(struct super_block *sb,
3855 struct buffer_head *bh, int wait)
3856 {
3857 PROC_INFO_INC(sb, journal.prepare);
3858
3859 if (!trylock_buffer(bh)) {
3860 if (!wait)
3861 return 0;
3862 lock_buffer(bh);
3863 }
3864 set_buffer_journal_prepared(bh);
3865 if (test_clear_buffer_dirty(bh) && buffer_journal_dirty(bh)) {
3866 clear_buffer_journal_test(bh);
3867 set_buffer_journal_restore_dirty(bh);
3868 }
3869 unlock_buffer(bh);
3870 return 1;
3871 }
3872
3873 static void flush_old_journal_lists(struct super_block *s)
3874 {
3875 struct reiserfs_journal *journal = SB_JOURNAL(s);
3876 struct reiserfs_journal_list *jl;
3877 struct list_head *entry;
3878 time_t now = get_seconds();
3879
3880 while (!list_empty(&journal->j_journal_list)) {
3881 entry = journal->j_journal_list.next;
3882 jl = JOURNAL_LIST_ENTRY(entry);
3883 /* this check should always be run, to send old lists to disk */
3884 if (jl->j_timestamp < (now - (JOURNAL_MAX_TRANS_AGE * 4)) &&
3885 atomic_read(&jl->j_commit_left) == 0 &&
3886 test_transaction(s, jl)) {
3887 flush_used_journal_lists(s, jl);
3888 } else {
3889 break;
3890 }
3891 }
3892 }
3893
3894 /*
3895 ** long and ugly. If flush, will not return until all commit
3896 ** blocks and all real buffers in the trans are on disk.
3897 ** If no_async, won't return until all commit blocks are on disk.
3898 **
3899 ** keep reading, there are comments as you go along
3900 **
3901 ** If the journal is aborted, we just clean up. Things like flushing
3902 ** journal lists, etc just won't happen.
3903 */
3904 static int do_journal_end(struct reiserfs_transaction_handle *th,
3905 struct super_block *sb, unsigned long nblocks,
3906 int flags)
3907 {
3908 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3909 struct reiserfs_journal_cnode *cn, *next, *jl_cn;
3910 struct reiserfs_journal_cnode *last_cn = NULL;
3911 struct reiserfs_journal_desc *desc;
3912 struct reiserfs_journal_commit *commit;
3913 struct buffer_head *c_bh; /* commit bh */
3914 struct buffer_head *d_bh; /* desc bh */
3915 int cur_write_start = 0; /* start index of current log write */
3916 int old_start;
3917 int i;
3918 int flush;
3919 int wait_on_commit;
3920 struct reiserfs_journal_list *jl, *temp_jl;
3921 struct list_head *entry, *safe;
3922 unsigned long jindex;
3923 unsigned int commit_trans_id;
3924 int trans_half;
3925
3926 BUG_ON(th->t_refcount > 1);
3927 BUG_ON(!th->t_trans_id);
3928
3929 /* protect flush_older_commits from doing mistakes if the
3930 transaction ID counter gets overflowed. */
3931 if (th->t_trans_id == ~0U)
3932 flags |= FLUSH_ALL | COMMIT_NOW | WAIT;
3933 flush = flags & FLUSH_ALL;
3934 wait_on_commit = flags & WAIT;
3935
3936 current->journal_info = th->t_handle_save;
3937 reiserfs_check_lock_depth(sb, "journal end");
3938 if (journal->j_len == 0) {
3939 reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
3940 1);
3941 journal_mark_dirty(th, sb, SB_BUFFER_WITH_SB(sb));
3942 }
3943
3944 lock_journal(sb);
3945 if (journal->j_next_full_flush) {
3946 flags |= FLUSH_ALL;
3947 flush = 1;
3948 }
3949 if (journal->j_next_async_flush) {
3950 flags |= COMMIT_NOW | WAIT;
3951 wait_on_commit = 1;
3952 }
3953
3954 /* check_journal_end locks the journal, and unlocks if it does not return 1
3955 ** it tells us if we should continue with the journal_end, or just return
3956 */
3957 if (!check_journal_end(th, sb, nblocks, flags)) {
3958 sb->s_dirt = 1;
3959 wake_queued_writers(sb);
3960 reiserfs_async_progress_wait(sb);
3961 goto out;
3962 }
3963
3964 /* check_journal_end might set these, check again */
3965 if (journal->j_next_full_flush) {
3966 flush = 1;
3967 }
3968
3969 /*
3970 ** j must wait means we have to flush the log blocks, and the real blocks for
3971 ** this transaction
3972 */
3973 if (journal->j_must_wait > 0) {
3974 flush = 1;
3975 }
3976 #ifdef REISERFS_PREALLOCATE
3977 /* quota ops might need to nest, setup the journal_info pointer for them
3978 * and raise the refcount so that it is > 0. */
3979 current->journal_info = th;
3980 th->t_refcount++;
3981 reiserfs_discard_all_prealloc(th); /* it should not involve new blocks into
3982 * the transaction */
3983 th->t_refcount--;
3984 current->journal_info = th->t_handle_save;
3985 #endif
3986
3987 /* setup description block */
3988 d_bh =
3989 journal_getblk(sb,
3990 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
3991 journal->j_start);
3992 set_buffer_uptodate(d_bh);
3993 desc = (struct reiserfs_journal_desc *)(d_bh)->b_data;
3994 memset(d_bh->b_data, 0, d_bh->b_size);
3995 memcpy(get_journal_desc_magic(d_bh), JOURNAL_DESC_MAGIC, 8);
3996 set_desc_trans_id(desc, journal->j_trans_id);
3997
3998 /* setup commit block. Don't write (keep it clean too) this one until after everyone else is written */
3999 c_bh = journal_getblk(sb, SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
4000 ((journal->j_start + journal->j_len +
4001 1) % SB_ONDISK_JOURNAL_SIZE(sb)));
4002 commit = (struct reiserfs_journal_commit *)c_bh->b_data;
4003 memset(c_bh->b_data, 0, c_bh->b_size);
4004 set_commit_trans_id(commit, journal->j_trans_id);
4005 set_buffer_uptodate(c_bh);
4006
4007 /* init this journal list */
4008 jl = journal->j_current_jl;
4009
4010 /* we lock the commit before doing anything because
4011 * we want to make sure nobody tries to run flush_commit_list until
4012 * the new transaction is fully setup, and we've already flushed the
4013 * ordered bh list
4014 */
4015 reiserfs_mutex_lock_safe(&jl->j_commit_mutex, sb);
4016
4017 /* save the transaction id in case we need to commit it later */
4018 commit_trans_id = jl->j_trans_id;
4019
4020 atomic_set(&jl->j_older_commits_done, 0);
4021 jl->j_trans_id = journal->j_trans_id;
4022 jl->j_timestamp = journal->j_trans_start_time;
4023 jl->j_commit_bh = c_bh;
4024 jl->j_start = journal->j_start;
4025 jl->j_len = journal->j_len;
4026 atomic_set(&jl->j_nonzerolen, journal->j_len);
4027 atomic_set(&jl->j_commit_left, journal->j_len + 2);
4028 jl->j_realblock = NULL;
4029
4030 /* The ENTIRE FOR LOOP MUST not cause schedule to occur.
4031 ** for each real block, add it to the journal list hash,
4032 ** copy into real block index array in the commit or desc block
4033 */
4034 trans_half = journal_trans_half(sb->s_blocksize);
4035 for (i = 0, cn = journal->j_first; cn; cn = cn->next, i++) {
4036 if (buffer_journaled(cn->bh)) {
4037 jl_cn = get_cnode(sb);
4038 if (!jl_cn) {
4039 reiserfs_panic(sb, "journal-1676",
4040 "get_cnode returned NULL");
4041 }
4042 if (i == 0) {
4043 jl->j_realblock = jl_cn;
4044 }
4045 jl_cn->prev = last_cn;
4046 jl_cn->next = NULL;
4047 if (last_cn) {
4048 last_cn->next = jl_cn;
4049 }
4050 last_cn = jl_cn;
4051 /* make sure the block we are trying to log is not a block
4052 of journal or reserved area */
4053
4054 if (is_block_in_log_or_reserved_area
4055 (sb, cn->bh->b_blocknr)) {
4056 reiserfs_panic(sb, "journal-2332",
4057 "Trying to log block %lu, "
4058 "which is a log block",
4059 cn->bh->b_blocknr);
4060 }
4061 jl_cn->blocknr = cn->bh->b_blocknr;
4062 jl_cn->state = 0;
4063 jl_cn->sb = sb;
4064 jl_cn->bh = cn->bh;
4065 jl_cn->jlist = jl;
4066 insert_journal_hash(journal->j_list_hash_table, jl_cn);
4067 if (i < trans_half) {
4068 desc->j_realblock[i] =
4069 cpu_to_le32(cn->bh->b_blocknr);
4070 } else {
4071 commit->j_realblock[i - trans_half] =
4072 cpu_to_le32(cn->bh->b_blocknr);
4073 }
4074 } else {
4075 i--;
4076 }
4077 }
4078 set_desc_trans_len(desc, journal->j_len);
4079 set_desc_mount_id(desc, journal->j_mount_id);
4080 set_desc_trans_id(desc, journal->j_trans_id);
4081 set_commit_trans_len(commit, journal->j_len);
4082
4083 /* special check in case all buffers in the journal were marked for not logging */
4084 BUG_ON(journal->j_len == 0);
4085
4086 /* we're about to dirty all the log blocks, mark the description block
4087 * dirty now too. Don't mark the commit block dirty until all the
4088 * others are on disk
4089 */
4090 mark_buffer_dirty(d_bh);
4091
4092 /* first data block is j_start + 1, so add one to cur_write_start wherever you use it */
4093 cur_write_start = journal->j_start;
4094 cn = journal->j_first;
4095 jindex = 1; /* start at one so we don't get the desc again */
4096 while (cn) {
4097 clear_buffer_journal_new(cn->bh);
4098 /* copy all the real blocks into log area. dirty log blocks */
4099 if (buffer_journaled(cn->bh)) {
4100 struct buffer_head *tmp_bh;
4101 char *addr;
4102 struct page *page;
4103 tmp_bh =
4104 journal_getblk(sb,
4105 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
4106 ((cur_write_start +
4107 jindex) %
4108 SB_ONDISK_JOURNAL_SIZE(sb)));
4109 set_buffer_uptodate(tmp_bh);
4110 page = cn->bh->b_page;
4111 addr = kmap(page);
4112 memcpy(tmp_bh->b_data,
4113 addr + offset_in_page(cn->bh->b_data),
4114 cn->bh->b_size);
4115 kunmap(page);
4116 mark_buffer_dirty(tmp_bh);
4117 jindex++;
4118 set_buffer_journal_dirty(cn->bh);
4119 clear_buffer_journaled(cn->bh);
4120 } else {
4121 /* JDirty cleared sometime during transaction. don't log this one */
4122 reiserfs_warning(sb, "journal-2048",
4123 "BAD, buffer in journal hash, "
4124 "but not JDirty!");
4125 brelse(cn->bh);
4126 }
4127 next = cn->next;
4128 free_cnode(sb, cn);
4129 cn = next;
4130 reiserfs_write_unlock(sb);
4131 cond_resched();
4132 reiserfs_write_lock(sb);
4133 }
4134
4135 /* we are done with both the c_bh and d_bh, but
4136 ** c_bh must be written after all other commit blocks,
4137 ** so we dirty/relse c_bh in flush_commit_list, with commit_left <= 1.
4138 */
4139
4140 journal->j_current_jl = alloc_journal_list(sb);
4141
4142 /* now it is safe to insert this transaction on the main list */
4143 list_add_tail(&jl->j_list, &journal->j_journal_list);
4144 list_add_tail(&jl->j_working_list, &journal->j_working_list);
4145 journal->j_num_work_lists++;
4146
4147 /* reset journal values for the next transaction */
4148 old_start = journal->j_start;
4149 journal->j_start =
4150 (journal->j_start + journal->j_len +
4151 2) % SB_ONDISK_JOURNAL_SIZE(sb);
4152 atomic_set(&(journal->j_wcount), 0);
4153 journal->j_bcount = 0;
4154 journal->j_last = NULL;
4155 journal->j_first = NULL;
4156 journal->j_len = 0;
4157 journal->j_trans_start_time = 0;
4158 /* check for trans_id overflow */
4159 if (++journal->j_trans_id == 0)
4160 journal->j_trans_id = 10;
4161 journal->j_current_jl->j_trans_id = journal->j_trans_id;
4162 journal->j_must_wait = 0;
4163 journal->j_len_alloc = 0;
4164 journal->j_next_full_flush = 0;
4165 journal->j_next_async_flush = 0;
4166 init_journal_hash(sb);
4167
4168 // make sure reiserfs_add_jh sees the new current_jl before we
4169 // write out the tails
4170 smp_mb();
4171
4172 /* tail conversion targets have to hit the disk before we end the
4173 * transaction. Otherwise a later transaction might repack the tail
4174 * before this transaction commits, leaving the data block unflushed and
4175 * clean, if we crash before the later transaction commits, the data block
4176 * is lost.
4177 */
4178 if (!list_empty(&jl->j_tail_bh_list)) {
4179 reiserfs_write_unlock(sb);
4180 write_ordered_buffers(&journal->j_dirty_buffers_lock,
4181 journal, jl, &jl->j_tail_bh_list);
4182 reiserfs_write_lock(sb);
4183 }
4184 BUG_ON(!list_empty(&jl->j_tail_bh_list));
4185 mutex_unlock(&jl->j_commit_mutex);
4186
4187 /* honor the flush wishes from the caller, simple commits can
4188 ** be done outside the journal lock, they are done below
4189 **
4190 ** if we don't flush the commit list right now, we put it into
4191 ** the work queue so the people waiting on the async progress work
4192 ** queue don't wait for this proc to flush journal lists and such.
4193 */
4194 if (flush) {
4195 flush_commit_list(sb, jl, 1);
4196 flush_journal_list(sb, jl, 1);
4197 } else if (!(jl->j_state & LIST_COMMIT_PENDING))
4198 queue_delayed_work(commit_wq, &journal->j_work, HZ / 10);
4199
4200 /* if the next transaction has any chance of wrapping, flush
4201 ** transactions that might get overwritten. If any journal lists are very
4202 ** old flush them as well.
4203 */
4204 first_jl:
4205 list_for_each_safe(entry, safe, &journal->j_journal_list) {
4206 temp_jl = JOURNAL_LIST_ENTRY(entry);
4207 if (journal->j_start <= temp_jl->j_start) {
4208 if ((journal->j_start + journal->j_trans_max + 1) >=
4209 temp_jl->j_start) {
4210 flush_used_journal_lists(sb, temp_jl);
4211 goto first_jl;
4212 } else if ((journal->j_start +
4213 journal->j_trans_max + 1) <
4214 SB_ONDISK_JOURNAL_SIZE(sb)) {
4215 /* if we don't cross into the next transaction and we don't
4216 * wrap, there is no way we can overlap any later transactions
4217 * break now
4218 */
4219 break;
4220 }
4221 } else if ((journal->j_start +
4222 journal->j_trans_max + 1) >
4223 SB_ONDISK_JOURNAL_SIZE(sb)) {
4224 if (((journal->j_start + journal->j_trans_max + 1) %
4225 SB_ONDISK_JOURNAL_SIZE(sb)) >=
4226 temp_jl->j_start) {
4227 flush_used_journal_lists(sb, temp_jl);
4228 goto first_jl;
4229 } else {
4230 /* we don't overlap anything from out start to the end of the
4231 * log, and our wrapped portion doesn't overlap anything at
4232 * the start of the log. We can break
4233 */
4234 break;
4235 }
4236 }
4237 }
4238 flush_old_journal_lists(sb);
4239
4240 journal->j_current_jl->j_list_bitmap =
4241 get_list_bitmap(sb, journal->j_current_jl);
4242
4243 if (!(journal->j_current_jl->j_list_bitmap)) {
4244 reiserfs_panic(sb, "journal-1996",
4245 "could not get a list bitmap");
4246 }
4247
4248 atomic_set(&(journal->j_jlock), 0);
4249 unlock_journal(sb);
4250 /* wake up any body waiting to join. */
4251 clear_bit(J_WRITERS_QUEUED, &journal->j_state);
4252 wake_up(&(journal->j_join_wait));
4253
4254 if (!flush && wait_on_commit &&
4255 journal_list_still_alive(sb, commit_trans_id)) {
4256 flush_commit_list(sb, jl, 1);
4257 }
4258 out:
4259 reiserfs_check_lock_depth(sb, "journal end2");
4260
4261 memset(th, 0, sizeof(*th));
4262 /* Re-set th->t_super, so we can properly keep track of how many
4263 * persistent transactions there are. We need to do this so if this
4264 * call is part of a failed restart_transaction, we can free it later */
4265 th->t_super = sb;
4266
4267 return journal->j_errno;
4268 }
4269
4270 /* Send the file system read only and refuse new transactions */
4271 void reiserfs_abort_journal(struct super_block *sb, int errno)
4272 {
4273 struct reiserfs_journal *journal = SB_JOURNAL(sb);
4274 if (test_bit(J_ABORTED, &journal->j_state))
4275 return;
4276
4277 if (!journal->j_errno)
4278 journal->j_errno = errno;
4279
4280 sb->s_flags |= MS_RDONLY;
4281 set_bit(J_ABORTED, &journal->j_state);
4282
4283 #ifdef CONFIG_REISERFS_CHECK
4284 dump_stack();
4285 #endif
4286 }
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