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Merge branch 'bind_unbind' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh...
[GitHub/LineageOS/android_kernel_motorola_exynos9610.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 /* must be correct to keep the desc and commit structs at 4k */
62 #define JOURNAL_TRANS_HALF 1018
63 #define BUFNR 64 /*read ahead */
64
65 /* cnode stat bits. Move these into reiserfs_fs.h */
66
67 /* this block was freed, and can't be written. */
68 #define BLOCK_FREED 2
69 /* this block was freed during this transaction, and can't be written */
70 #define BLOCK_FREED_HOLDER 3
71
72 /* used in flush_journal_list */
73 #define BLOCK_NEEDS_FLUSH 4
74 #define BLOCK_DIRTIED 5
75
76 /* journal list state bits */
77 #define LIST_TOUCHED 1
78 #define LIST_DIRTY 2
79 #define LIST_COMMIT_PENDING 4 /* someone will commit this list */
80
81 /* flags for do_journal_end */
82 #define FLUSH_ALL 1 /* flush commit and real blocks */
83 #define COMMIT_NOW 2 /* end and commit this transaction */
84 #define WAIT 4 /* wait for the log blocks to hit the disk */
85
86 static int do_journal_end(struct reiserfs_transaction_handle *, int flags);
87 static int flush_journal_list(struct super_block *s,
88 struct reiserfs_journal_list *jl, int flushall);
89 static int flush_commit_list(struct super_block *s,
90 struct reiserfs_journal_list *jl, int flushall);
91 static int can_dirty(struct reiserfs_journal_cnode *cn);
92 static int journal_join(struct reiserfs_transaction_handle *th,
93 struct super_block *sb);
94 static void release_journal_dev(struct super_block *super,
95 struct reiserfs_journal *journal);
96 static int dirty_one_transaction(struct super_block *s,
97 struct reiserfs_journal_list *jl);
98 static void flush_async_commits(struct work_struct *work);
99 static void queue_log_writer(struct super_block *s);
100
101 /* values for join in do_journal_begin_r */
102 enum {
103 JBEGIN_REG = 0, /* regular journal begin */
104 /* join the running transaction if at all possible */
105 JBEGIN_JOIN = 1,
106 /* called from cleanup code, ignores aborted flag */
107 JBEGIN_ABORT = 2,
108 };
109
110 static int do_journal_begin_r(struct reiserfs_transaction_handle *th,
111 struct super_block *sb,
112 unsigned long nblocks, int join);
113
114 static void init_journal_hash(struct super_block *sb)
115 {
116 struct reiserfs_journal *journal = SB_JOURNAL(sb);
117 memset(journal->j_hash_table, 0,
118 JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *));
119 }
120
121 /*
122 * clears BH_Dirty and sticks the buffer on the clean list. Called because
123 * I can't allow refile_buffer to make schedule happen after I've freed a
124 * block. Look at remove_from_transaction and journal_mark_freed for
125 * more details.
126 */
127 static int reiserfs_clean_and_file_buffer(struct buffer_head *bh)
128 {
129 if (bh) {
130 clear_buffer_dirty(bh);
131 clear_buffer_journal_test(bh);
132 }
133 return 0;
134 }
135
136 static struct reiserfs_bitmap_node *allocate_bitmap_node(struct super_block
137 *sb)
138 {
139 struct reiserfs_bitmap_node *bn;
140 static int id;
141
142 bn = kmalloc(sizeof(struct reiserfs_bitmap_node), GFP_NOFS);
143 if (!bn) {
144 return NULL;
145 }
146 bn->data = kzalloc(sb->s_blocksize, GFP_NOFS);
147 if (!bn->data) {
148 kfree(bn);
149 return NULL;
150 }
151 bn->id = id++;
152 INIT_LIST_HEAD(&bn->list);
153 return bn;
154 }
155
156 static struct reiserfs_bitmap_node *get_bitmap_node(struct super_block *sb)
157 {
158 struct reiserfs_journal *journal = SB_JOURNAL(sb);
159 struct reiserfs_bitmap_node *bn = NULL;
160 struct list_head *entry = journal->j_bitmap_nodes.next;
161
162 journal->j_used_bitmap_nodes++;
163 repeat:
164
165 if (entry != &journal->j_bitmap_nodes) {
166 bn = list_entry(entry, struct reiserfs_bitmap_node, list);
167 list_del(entry);
168 memset(bn->data, 0, sb->s_blocksize);
169 journal->j_free_bitmap_nodes--;
170 return bn;
171 }
172 bn = allocate_bitmap_node(sb);
173 if (!bn) {
174 yield();
175 goto repeat;
176 }
177 return bn;
178 }
179 static inline void free_bitmap_node(struct super_block *sb,
180 struct reiserfs_bitmap_node *bn)
181 {
182 struct reiserfs_journal *journal = SB_JOURNAL(sb);
183 journal->j_used_bitmap_nodes--;
184 if (journal->j_free_bitmap_nodes > REISERFS_MAX_BITMAP_NODES) {
185 kfree(bn->data);
186 kfree(bn);
187 } else {
188 list_add(&bn->list, &journal->j_bitmap_nodes);
189 journal->j_free_bitmap_nodes++;
190 }
191 }
192
193 static void allocate_bitmap_nodes(struct super_block *sb)
194 {
195 int i;
196 struct reiserfs_journal *journal = SB_JOURNAL(sb);
197 struct reiserfs_bitmap_node *bn = NULL;
198 for (i = 0; i < REISERFS_MIN_BITMAP_NODES; i++) {
199 bn = allocate_bitmap_node(sb);
200 if (bn) {
201 list_add(&bn->list, &journal->j_bitmap_nodes);
202 journal->j_free_bitmap_nodes++;
203 } else {
204 /* this is ok, we'll try again when more are needed */
205 break;
206 }
207 }
208 }
209
210 static int set_bit_in_list_bitmap(struct super_block *sb,
211 b_blocknr_t block,
212 struct reiserfs_list_bitmap *jb)
213 {
214 unsigned int bmap_nr = block / (sb->s_blocksize << 3);
215 unsigned int bit_nr = block % (sb->s_blocksize << 3);
216
217 if (!jb->bitmaps[bmap_nr]) {
218 jb->bitmaps[bmap_nr] = get_bitmap_node(sb);
219 }
220 set_bit(bit_nr, (unsigned long *)jb->bitmaps[bmap_nr]->data);
221 return 0;
222 }
223
224 static void cleanup_bitmap_list(struct super_block *sb,
225 struct reiserfs_list_bitmap *jb)
226 {
227 int i;
228 if (jb->bitmaps == NULL)
229 return;
230
231 for (i = 0; i < reiserfs_bmap_count(sb); i++) {
232 if (jb->bitmaps[i]) {
233 free_bitmap_node(sb, jb->bitmaps[i]);
234 jb->bitmaps[i] = NULL;
235 }
236 }
237 }
238
239 /*
240 * only call this on FS unmount.
241 */
242 static int free_list_bitmaps(struct super_block *sb,
243 struct reiserfs_list_bitmap *jb_array)
244 {
245 int i;
246 struct reiserfs_list_bitmap *jb;
247 for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
248 jb = jb_array + i;
249 jb->journal_list = NULL;
250 cleanup_bitmap_list(sb, jb);
251 vfree(jb->bitmaps);
252 jb->bitmaps = NULL;
253 }
254 return 0;
255 }
256
257 static int free_bitmap_nodes(struct super_block *sb)
258 {
259 struct reiserfs_journal *journal = SB_JOURNAL(sb);
260 struct list_head *next = journal->j_bitmap_nodes.next;
261 struct reiserfs_bitmap_node *bn;
262
263 while (next != &journal->j_bitmap_nodes) {
264 bn = list_entry(next, struct reiserfs_bitmap_node, list);
265 list_del(next);
266 kfree(bn->data);
267 kfree(bn);
268 next = journal->j_bitmap_nodes.next;
269 journal->j_free_bitmap_nodes--;
270 }
271
272 return 0;
273 }
274
275 /*
276 * get memory for JOURNAL_NUM_BITMAPS worth of bitmaps.
277 * jb_array is the array to be filled in.
278 */
279 int reiserfs_allocate_list_bitmaps(struct super_block *sb,
280 struct reiserfs_list_bitmap *jb_array,
281 unsigned int bmap_nr)
282 {
283 int i;
284 int failed = 0;
285 struct reiserfs_list_bitmap *jb;
286 int mem = bmap_nr * sizeof(struct reiserfs_bitmap_node *);
287
288 for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
289 jb = jb_array + i;
290 jb->journal_list = NULL;
291 jb->bitmaps = vzalloc(mem);
292 if (!jb->bitmaps) {
293 reiserfs_warning(sb, "clm-2000", "unable to "
294 "allocate bitmaps for journal lists");
295 failed = 1;
296 break;
297 }
298 }
299 if (failed) {
300 free_list_bitmaps(sb, jb_array);
301 return -1;
302 }
303 return 0;
304 }
305
306 /*
307 * find an available list bitmap. If you can't find one, flush a commit list
308 * and try again
309 */
310 static struct reiserfs_list_bitmap *get_list_bitmap(struct super_block *sb,
311 struct reiserfs_journal_list
312 *jl)
313 {
314 int i, j;
315 struct reiserfs_journal *journal = SB_JOURNAL(sb);
316 struct reiserfs_list_bitmap *jb = NULL;
317
318 for (j = 0; j < (JOURNAL_NUM_BITMAPS * 3); j++) {
319 i = journal->j_list_bitmap_index;
320 journal->j_list_bitmap_index = (i + 1) % JOURNAL_NUM_BITMAPS;
321 jb = journal->j_list_bitmap + i;
322 if (journal->j_list_bitmap[i].journal_list) {
323 flush_commit_list(sb,
324 journal->j_list_bitmap[i].
325 journal_list, 1);
326 if (!journal->j_list_bitmap[i].journal_list) {
327 break;
328 }
329 } else {
330 break;
331 }
332 }
333 /* double check to make sure if flushed correctly */
334 if (jb->journal_list)
335 return NULL;
336 jb->journal_list = jl;
337 return jb;
338 }
339
340 /*
341 * allocates a new chunk of X nodes, and links them all together as a list.
342 * Uses the cnode->next and cnode->prev pointers
343 * returns NULL on failure
344 */
345 static struct reiserfs_journal_cnode *allocate_cnodes(int num_cnodes)
346 {
347 struct reiserfs_journal_cnode *head;
348 int i;
349 if (num_cnodes <= 0) {
350 return NULL;
351 }
352 head = vzalloc(num_cnodes * sizeof(struct reiserfs_journal_cnode));
353 if (!head) {
354 return NULL;
355 }
356 head[0].prev = NULL;
357 head[0].next = head + 1;
358 for (i = 1; i < num_cnodes; i++) {
359 head[i].prev = head + (i - 1);
360 head[i].next = head + (i + 1); /* if last one, overwrite it after the if */
361 }
362 head[num_cnodes - 1].next = NULL;
363 return head;
364 }
365
366 /* pulls a cnode off the free list, or returns NULL on failure */
367 static struct reiserfs_journal_cnode *get_cnode(struct super_block *sb)
368 {
369 struct reiserfs_journal_cnode *cn;
370 struct reiserfs_journal *journal = SB_JOURNAL(sb);
371
372 reiserfs_check_lock_depth(sb, "get_cnode");
373
374 if (journal->j_cnode_free <= 0) {
375 return NULL;
376 }
377 journal->j_cnode_used++;
378 journal->j_cnode_free--;
379 cn = journal->j_cnode_free_list;
380 if (!cn) {
381 return cn;
382 }
383 if (cn->next) {
384 cn->next->prev = NULL;
385 }
386 journal->j_cnode_free_list = cn->next;
387 memset(cn, 0, sizeof(struct reiserfs_journal_cnode));
388 return cn;
389 }
390
391 /*
392 * returns a cnode to the free list
393 */
394 static void free_cnode(struct super_block *sb,
395 struct reiserfs_journal_cnode *cn)
396 {
397 struct reiserfs_journal *journal = SB_JOURNAL(sb);
398
399 reiserfs_check_lock_depth(sb, "free_cnode");
400
401 journal->j_cnode_used--;
402 journal->j_cnode_free++;
403 /* memset(cn, 0, sizeof(struct reiserfs_journal_cnode)) ; */
404 cn->next = journal->j_cnode_free_list;
405 if (journal->j_cnode_free_list) {
406 journal->j_cnode_free_list->prev = cn;
407 }
408 cn->prev = NULL; /* not needed with the memset, but I might kill the memset, and forget to do this */
409 journal->j_cnode_free_list = cn;
410 }
411
412 static void clear_prepared_bits(struct buffer_head *bh)
413 {
414 clear_buffer_journal_prepared(bh);
415 clear_buffer_journal_restore_dirty(bh);
416 }
417
418 /*
419 * return a cnode with same dev, block number and size in table,
420 * or null if not found
421 */
422 static inline struct reiserfs_journal_cnode *get_journal_hash_dev(struct
423 super_block
424 *sb,
425 struct
426 reiserfs_journal_cnode
427 **table,
428 long bl)
429 {
430 struct reiserfs_journal_cnode *cn;
431 cn = journal_hash(table, sb, bl);
432 while (cn) {
433 if (cn->blocknr == bl && cn->sb == sb)
434 return cn;
435 cn = cn->hnext;
436 }
437 return (struct reiserfs_journal_cnode *)0;
438 }
439
440 /*
441 * this actually means 'can this block be reallocated yet?'. If you set
442 * search_all, a block can only be allocated if it is not in the current
443 * transaction, was not freed by the current transaction, and has no chance
444 * of ever being overwritten by a replay after crashing.
445 *
446 * If you don't set search_all, a block can only be allocated if it is not
447 * in the current transaction. Since deleting a block removes it from the
448 * current transaction, this case should never happen. If you don't set
449 * search_all, make sure you never write the block without logging it.
450 *
451 * next_zero_bit is a suggestion about the next block to try for find_forward.
452 * when bl is rejected because it is set in a journal list bitmap, we search
453 * for the next zero bit in the bitmap that rejected bl. Then, we return
454 * that through next_zero_bit for find_forward to try.
455 *
456 * Just because we return something in next_zero_bit does not mean we won't
457 * reject it on the next call to reiserfs_in_journal
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 /*
473 * If we aren't doing a search_all, this is a metablock, and it
474 * will be logged before use. if we crash before the transaction
475 * that freed it commits, this transaction won't have committed
476 * either, and the block will never be written
477 */
478 if (search_all) {
479 for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
480 PROC_INFO_INC(sb, journal.in_journal_bitmap);
481 jb = journal->j_list_bitmap + i;
482 if (jb->journal_list && jb->bitmaps[bmap_nr] &&
483 test_bit(bit_nr,
484 (unsigned long *)jb->bitmaps[bmap_nr]->
485 data)) {
486 *next_zero_bit =
487 find_next_zero_bit((unsigned long *)
488 (jb->bitmaps[bmap_nr]->
489 data),
490 sb->s_blocksize << 3,
491 bit_nr + 1);
492 return 1;
493 }
494 }
495 }
496
497 bl = bmap_nr * (sb->s_blocksize << 3) + bit_nr;
498 /* is it in any old transactions? */
499 if (search_all
500 && (cn =
501 get_journal_hash_dev(sb, journal->j_list_hash_table, bl))) {
502 return 1;
503 }
504
505 /* is it in the current transaction. This should never happen */
506 if ((cn = get_journal_hash_dev(sb, journal->j_hash_table, bl))) {
507 BUG();
508 return 1;
509 }
510
511 PROC_INFO_INC(sb, journal.in_journal_reusable);
512 /* safe for reuse */
513 return 0;
514 }
515
516 /* insert cn into table */
517 static inline void insert_journal_hash(struct reiserfs_journal_cnode **table,
518 struct reiserfs_journal_cnode *cn)
519 {
520 struct reiserfs_journal_cnode *cn_orig;
521
522 cn_orig = journal_hash(table, cn->sb, cn->blocknr);
523 cn->hnext = cn_orig;
524 cn->hprev = NULL;
525 if (cn_orig) {
526 cn_orig->hprev = cn;
527 }
528 journal_hash(table, cn->sb, cn->blocknr) = cn;
529 }
530
531 /* lock the current transaction */
532 static inline void lock_journal(struct super_block *sb)
533 {
534 PROC_INFO_INC(sb, journal.lock_journal);
535
536 reiserfs_mutex_lock_safe(&SB_JOURNAL(sb)->j_mutex, sb);
537 }
538
539 /* unlock the current transaction */
540 static inline void unlock_journal(struct super_block *sb)
541 {
542 mutex_unlock(&SB_JOURNAL(sb)->j_mutex);
543 }
544
545 static inline void get_journal_list(struct reiserfs_journal_list *jl)
546 {
547 jl->j_refcount++;
548 }
549
550 static inline void put_journal_list(struct super_block *s,
551 struct reiserfs_journal_list *jl)
552 {
553 if (jl->j_refcount < 1) {
554 reiserfs_panic(s, "journal-2", "trans id %u, refcount at %d",
555 jl->j_trans_id, jl->j_refcount);
556 }
557 if (--jl->j_refcount == 0)
558 kfree(jl);
559 }
560
561 /*
562 * this used to be much more involved, and I'm keeping it just in case
563 * things get ugly again. it gets called by flush_commit_list, and
564 * cleans up any data stored about blocks freed during a transaction.
565 */
566 static void cleanup_freed_for_journal_list(struct super_block *sb,
567 struct reiserfs_journal_list *jl)
568 {
569
570 struct reiserfs_list_bitmap *jb = jl->j_list_bitmap;
571 if (jb) {
572 cleanup_bitmap_list(sb, jb);
573 }
574 jl->j_list_bitmap->journal_list = NULL;
575 jl->j_list_bitmap = NULL;
576 }
577
578 static int journal_list_still_alive(struct super_block *s,
579 unsigned int trans_id)
580 {
581 struct reiserfs_journal *journal = SB_JOURNAL(s);
582 struct list_head *entry = &journal->j_journal_list;
583 struct reiserfs_journal_list *jl;
584
585 if (!list_empty(entry)) {
586 jl = JOURNAL_LIST_ENTRY(entry->next);
587 if (jl->j_trans_id <= trans_id) {
588 return 1;
589 }
590 }
591 return 0;
592 }
593
594 /*
595 * If page->mapping was null, we failed to truncate this page for
596 * some reason. Most likely because it was truncated after being
597 * logged via data=journal.
598 *
599 * This does a check to see if the buffer belongs to one of these
600 * lost pages before doing the final put_bh. If page->mapping was
601 * null, it tries to free buffers on the page, which should make the
602 * final put_page drop the page from the lru.
603 */
604 static void release_buffer_page(struct buffer_head *bh)
605 {
606 struct page *page = bh->b_page;
607 if (!page->mapping && trylock_page(page)) {
608 get_page(page);
609 put_bh(bh);
610 if (!page->mapping)
611 try_to_free_buffers(page);
612 unlock_page(page);
613 put_page(page);
614 } else {
615 put_bh(bh);
616 }
617 }
618
619 static void reiserfs_end_buffer_io_sync(struct buffer_head *bh, int uptodate)
620 {
621 if (buffer_journaled(bh)) {
622 reiserfs_warning(NULL, "clm-2084",
623 "pinned buffer %lu:%pg sent to disk",
624 bh->b_blocknr, bh->b_bdev);
625 }
626 if (uptodate)
627 set_buffer_uptodate(bh);
628 else
629 clear_buffer_uptodate(bh);
630
631 unlock_buffer(bh);
632 release_buffer_page(bh);
633 }
634
635 static void reiserfs_end_ordered_io(struct buffer_head *bh, int uptodate)
636 {
637 if (uptodate)
638 set_buffer_uptodate(bh);
639 else
640 clear_buffer_uptodate(bh);
641 unlock_buffer(bh);
642 put_bh(bh);
643 }
644
645 static void submit_logged_buffer(struct buffer_head *bh)
646 {
647 get_bh(bh);
648 bh->b_end_io = reiserfs_end_buffer_io_sync;
649 clear_buffer_journal_new(bh);
650 clear_buffer_dirty(bh);
651 if (!test_clear_buffer_journal_test(bh))
652 BUG();
653 if (!buffer_uptodate(bh))
654 BUG();
655 submit_bh(REQ_OP_WRITE, 0, bh);
656 }
657
658 static void submit_ordered_buffer(struct buffer_head *bh)
659 {
660 get_bh(bh);
661 bh->b_end_io = reiserfs_end_ordered_io;
662 clear_buffer_dirty(bh);
663 if (!buffer_uptodate(bh))
664 BUG();
665 submit_bh(REQ_OP_WRITE, 0, bh);
666 }
667
668 #define CHUNK_SIZE 32
669 struct buffer_chunk {
670 struct buffer_head *bh[CHUNK_SIZE];
671 int nr;
672 };
673
674 static void write_chunk(struct buffer_chunk *chunk)
675 {
676 int i;
677 for (i = 0; i < chunk->nr; i++) {
678 submit_logged_buffer(chunk->bh[i]);
679 }
680 chunk->nr = 0;
681 }
682
683 static void write_ordered_chunk(struct buffer_chunk *chunk)
684 {
685 int i;
686 for (i = 0; i < chunk->nr; i++) {
687 submit_ordered_buffer(chunk->bh[i]);
688 }
689 chunk->nr = 0;
690 }
691
692 static int add_to_chunk(struct buffer_chunk *chunk, struct buffer_head *bh,
693 spinlock_t * lock, void (fn) (struct buffer_chunk *))
694 {
695 int ret = 0;
696 BUG_ON(chunk->nr >= CHUNK_SIZE);
697 chunk->bh[chunk->nr++] = bh;
698 if (chunk->nr >= CHUNK_SIZE) {
699 ret = 1;
700 if (lock) {
701 spin_unlock(lock);
702 fn(chunk);
703 spin_lock(lock);
704 } else {
705 fn(chunk);
706 }
707 }
708 return ret;
709 }
710
711 static atomic_t nr_reiserfs_jh = ATOMIC_INIT(0);
712 static struct reiserfs_jh *alloc_jh(void)
713 {
714 struct reiserfs_jh *jh;
715 while (1) {
716 jh = kmalloc(sizeof(*jh), GFP_NOFS);
717 if (jh) {
718 atomic_inc(&nr_reiserfs_jh);
719 return jh;
720 }
721 yield();
722 }
723 }
724
725 /*
726 * we want to free the jh when the buffer has been written
727 * and waited on
728 */
729 void reiserfs_free_jh(struct buffer_head *bh)
730 {
731 struct reiserfs_jh *jh;
732
733 jh = bh->b_private;
734 if (jh) {
735 bh->b_private = NULL;
736 jh->bh = NULL;
737 list_del_init(&jh->list);
738 kfree(jh);
739 if (atomic_read(&nr_reiserfs_jh) <= 0)
740 BUG();
741 atomic_dec(&nr_reiserfs_jh);
742 put_bh(bh);
743 }
744 }
745
746 static inline int __add_jh(struct reiserfs_journal *j, struct buffer_head *bh,
747 int tail)
748 {
749 struct reiserfs_jh *jh;
750
751 if (bh->b_private) {
752 spin_lock(&j->j_dirty_buffers_lock);
753 if (!bh->b_private) {
754 spin_unlock(&j->j_dirty_buffers_lock);
755 goto no_jh;
756 }
757 jh = bh->b_private;
758 list_del_init(&jh->list);
759 } else {
760 no_jh:
761 get_bh(bh);
762 jh = alloc_jh();
763 spin_lock(&j->j_dirty_buffers_lock);
764 /*
765 * buffer must be locked for __add_jh, should be able to have
766 * two adds at the same time
767 */
768 BUG_ON(bh->b_private);
769 jh->bh = bh;
770 bh->b_private = jh;
771 }
772 jh->jl = j->j_current_jl;
773 if (tail)
774 list_add_tail(&jh->list, &jh->jl->j_tail_bh_list);
775 else {
776 list_add_tail(&jh->list, &jh->jl->j_bh_list);
777 }
778 spin_unlock(&j->j_dirty_buffers_lock);
779 return 0;
780 }
781
782 int reiserfs_add_tail_list(struct inode *inode, struct buffer_head *bh)
783 {
784 return __add_jh(SB_JOURNAL(inode->i_sb), bh, 1);
785 }
786 int reiserfs_add_ordered_list(struct inode *inode, struct buffer_head *bh)
787 {
788 return __add_jh(SB_JOURNAL(inode->i_sb), bh, 0);
789 }
790
791 #define JH_ENTRY(l) list_entry((l), struct reiserfs_jh, list)
792 static int write_ordered_buffers(spinlock_t * lock,
793 struct reiserfs_journal *j,
794 struct reiserfs_journal_list *jl,
795 struct list_head *list)
796 {
797 struct buffer_head *bh;
798 struct reiserfs_jh *jh;
799 int ret = j->j_errno;
800 struct buffer_chunk chunk;
801 struct list_head tmp;
802 INIT_LIST_HEAD(&tmp);
803
804 chunk.nr = 0;
805 spin_lock(lock);
806 while (!list_empty(list)) {
807 jh = JH_ENTRY(list->next);
808 bh = jh->bh;
809 get_bh(bh);
810 if (!trylock_buffer(bh)) {
811 if (!buffer_dirty(bh)) {
812 list_move(&jh->list, &tmp);
813 goto loop_next;
814 }
815 spin_unlock(lock);
816 if (chunk.nr)
817 write_ordered_chunk(&chunk);
818 wait_on_buffer(bh);
819 cond_resched();
820 spin_lock(lock);
821 goto loop_next;
822 }
823 /*
824 * in theory, dirty non-uptodate buffers should never get here,
825 * but the upper layer io error paths still have a few quirks.
826 * Handle them here as gracefully as we can
827 */
828 if (!buffer_uptodate(bh) && buffer_dirty(bh)) {
829 clear_buffer_dirty(bh);
830 ret = -EIO;
831 }
832 if (buffer_dirty(bh)) {
833 list_move(&jh->list, &tmp);
834 add_to_chunk(&chunk, bh, lock, write_ordered_chunk);
835 } else {
836 reiserfs_free_jh(bh);
837 unlock_buffer(bh);
838 }
839 loop_next:
840 put_bh(bh);
841 cond_resched_lock(lock);
842 }
843 if (chunk.nr) {
844 spin_unlock(lock);
845 write_ordered_chunk(&chunk);
846 spin_lock(lock);
847 }
848 while (!list_empty(&tmp)) {
849 jh = JH_ENTRY(tmp.prev);
850 bh = jh->bh;
851 get_bh(bh);
852 reiserfs_free_jh(bh);
853
854 if (buffer_locked(bh)) {
855 spin_unlock(lock);
856 wait_on_buffer(bh);
857 spin_lock(lock);
858 }
859 if (!buffer_uptodate(bh)) {
860 ret = -EIO;
861 }
862 /*
863 * ugly interaction with invalidatepage here.
864 * reiserfs_invalidate_page will pin any buffer that has a
865 * valid journal head from an older transaction. If someone
866 * else sets our buffer dirty after we write it in the first
867 * loop, and then someone truncates the page away, nobody
868 * will ever write the buffer. We're safe if we write the
869 * page one last time after freeing the journal header.
870 */
871 if (buffer_dirty(bh) && unlikely(bh->b_page->mapping == NULL)) {
872 spin_unlock(lock);
873 ll_rw_block(REQ_OP_WRITE, 0, 1, &bh);
874 spin_lock(lock);
875 }
876 put_bh(bh);
877 cond_resched_lock(lock);
878 }
879 spin_unlock(lock);
880 return ret;
881 }
882
883 static int flush_older_commits(struct super_block *s,
884 struct reiserfs_journal_list *jl)
885 {
886 struct reiserfs_journal *journal = SB_JOURNAL(s);
887 struct reiserfs_journal_list *other_jl;
888 struct reiserfs_journal_list *first_jl;
889 struct list_head *entry;
890 unsigned int trans_id = jl->j_trans_id;
891 unsigned int other_trans_id;
892 unsigned int first_trans_id;
893
894 find_first:
895 /*
896 * first we walk backwards to find the oldest uncommitted transation
897 */
898 first_jl = jl;
899 entry = jl->j_list.prev;
900 while (1) {
901 other_jl = JOURNAL_LIST_ENTRY(entry);
902 if (entry == &journal->j_journal_list ||
903 atomic_read(&other_jl->j_older_commits_done))
904 break;
905
906 first_jl = other_jl;
907 entry = other_jl->j_list.prev;
908 }
909
910 /* if we didn't find any older uncommitted transactions, return now */
911 if (first_jl == jl) {
912 return 0;
913 }
914
915 first_trans_id = first_jl->j_trans_id;
916
917 entry = &first_jl->j_list;
918 while (1) {
919 other_jl = JOURNAL_LIST_ENTRY(entry);
920 other_trans_id = other_jl->j_trans_id;
921
922 if (other_trans_id < trans_id) {
923 if (atomic_read(&other_jl->j_commit_left) != 0) {
924 flush_commit_list(s, other_jl, 0);
925
926 /* list we were called with is gone, return */
927 if (!journal_list_still_alive(s, trans_id))
928 return 1;
929
930 /*
931 * the one we just flushed is gone, this means
932 * all older lists are also gone, so first_jl
933 * is no longer valid either. Go back to the
934 * beginning.
935 */
936 if (!journal_list_still_alive
937 (s, other_trans_id)) {
938 goto find_first;
939 }
940 }
941 entry = entry->next;
942 if (entry == &journal->j_journal_list)
943 return 0;
944 } else {
945 return 0;
946 }
947 }
948 return 0;
949 }
950
951 static int reiserfs_async_progress_wait(struct super_block *s)
952 {
953 struct reiserfs_journal *j = SB_JOURNAL(s);
954
955 if (atomic_read(&j->j_async_throttle)) {
956 int depth;
957
958 depth = reiserfs_write_unlock_nested(s);
959 congestion_wait(BLK_RW_ASYNC, HZ / 10);
960 reiserfs_write_lock_nested(s, depth);
961 }
962
963 return 0;
964 }
965
966 /*
967 * if this journal list still has commit blocks unflushed, send them to disk.
968 *
969 * log areas must be flushed in order (transaction 2 can't commit before
970 * transaction 1) Before the commit block can by written, every other log
971 * block must be safely on disk
972 */
973 static int flush_commit_list(struct super_block *s,
974 struct reiserfs_journal_list *jl, int flushall)
975 {
976 int i;
977 b_blocknr_t bn;
978 struct buffer_head *tbh = NULL;
979 unsigned int trans_id = jl->j_trans_id;
980 struct reiserfs_journal *journal = SB_JOURNAL(s);
981 int retval = 0;
982 int write_len;
983 int depth;
984
985 reiserfs_check_lock_depth(s, "flush_commit_list");
986
987 if (atomic_read(&jl->j_older_commits_done)) {
988 return 0;
989 }
990
991 /*
992 * before we can put our commit blocks on disk, we have to make
993 * sure everyone older than us is on disk too
994 */
995 BUG_ON(jl->j_len <= 0);
996 BUG_ON(trans_id == journal->j_trans_id);
997
998 get_journal_list(jl);
999 if (flushall) {
1000 if (flush_older_commits(s, jl) == 1) {
1001 /*
1002 * list disappeared during flush_older_commits.
1003 * return
1004 */
1005 goto put_jl;
1006 }
1007 }
1008
1009 /* make sure nobody is trying to flush this one at the same time */
1010 reiserfs_mutex_lock_safe(&jl->j_commit_mutex, s);
1011
1012 if (!journal_list_still_alive(s, trans_id)) {
1013 mutex_unlock(&jl->j_commit_mutex);
1014 goto put_jl;
1015 }
1016 BUG_ON(jl->j_trans_id == 0);
1017
1018 /* this commit is done, exit */
1019 if (atomic_read(&jl->j_commit_left) <= 0) {
1020 if (flushall) {
1021 atomic_set(&jl->j_older_commits_done, 1);
1022 }
1023 mutex_unlock(&jl->j_commit_mutex);
1024 goto put_jl;
1025 }
1026
1027 if (!list_empty(&jl->j_bh_list)) {
1028 int ret;
1029
1030 /*
1031 * We might sleep in numerous places inside
1032 * write_ordered_buffers. Relax the write lock.
1033 */
1034 depth = reiserfs_write_unlock_nested(s);
1035 ret = write_ordered_buffers(&journal->j_dirty_buffers_lock,
1036 journal, jl, &jl->j_bh_list);
1037 if (ret < 0 && retval == 0)
1038 retval = ret;
1039 reiserfs_write_lock_nested(s, depth);
1040 }
1041 BUG_ON(!list_empty(&jl->j_bh_list));
1042 /*
1043 * for the description block and all the log blocks, submit any buffers
1044 * that haven't already reached the disk. Try to write at least 256
1045 * log blocks. later on, we will only wait on blocks that correspond
1046 * to this transaction, but while we're unplugging we might as well
1047 * get a chunk of data on there.
1048 */
1049 atomic_inc(&journal->j_async_throttle);
1050 write_len = jl->j_len + 1;
1051 if (write_len < 256)
1052 write_len = 256;
1053 for (i = 0 ; i < write_len ; i++) {
1054 bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) + (jl->j_start + i) %
1055 SB_ONDISK_JOURNAL_SIZE(s);
1056 tbh = journal_find_get_block(s, bn);
1057 if (tbh) {
1058 if (buffer_dirty(tbh)) {
1059 depth = reiserfs_write_unlock_nested(s);
1060 ll_rw_block(REQ_OP_WRITE, 0, 1, &tbh);
1061 reiserfs_write_lock_nested(s, depth);
1062 }
1063 put_bh(tbh) ;
1064 }
1065 }
1066 atomic_dec(&journal->j_async_throttle);
1067
1068 for (i = 0; i < (jl->j_len + 1); i++) {
1069 bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) +
1070 (jl->j_start + i) % SB_ONDISK_JOURNAL_SIZE(s);
1071 tbh = journal_find_get_block(s, bn);
1072
1073 depth = reiserfs_write_unlock_nested(s);
1074 __wait_on_buffer(tbh);
1075 reiserfs_write_lock_nested(s, depth);
1076 /*
1077 * since we're using ll_rw_blk above, it might have skipped
1078 * over a locked buffer. Double check here
1079 */
1080 /* redundant, sync_dirty_buffer() checks */
1081 if (buffer_dirty(tbh)) {
1082 depth = reiserfs_write_unlock_nested(s);
1083 sync_dirty_buffer(tbh);
1084 reiserfs_write_lock_nested(s, depth);
1085 }
1086 if (unlikely(!buffer_uptodate(tbh))) {
1087 #ifdef CONFIG_REISERFS_CHECK
1088 reiserfs_warning(s, "journal-601",
1089 "buffer write failed");
1090 #endif
1091 retval = -EIO;
1092 }
1093 /* once for journal_find_get_block */
1094 put_bh(tbh);
1095 /* once due to original getblk in do_journal_end */
1096 put_bh(tbh);
1097 atomic_dec(&jl->j_commit_left);
1098 }
1099
1100 BUG_ON(atomic_read(&jl->j_commit_left) != 1);
1101
1102 /*
1103 * If there was a write error in the journal - we can't commit
1104 * this transaction - it will be invalid and, if successful,
1105 * will just end up propagating the write error out to
1106 * the file system.
1107 */
1108 if (likely(!retval && !reiserfs_is_journal_aborted (journal))) {
1109 if (buffer_dirty(jl->j_commit_bh))
1110 BUG();
1111 mark_buffer_dirty(jl->j_commit_bh) ;
1112 depth = reiserfs_write_unlock_nested(s);
1113 if (reiserfs_barrier_flush(s))
1114 __sync_dirty_buffer(jl->j_commit_bh,
1115 REQ_SYNC | REQ_PREFLUSH | REQ_FUA);
1116 else
1117 sync_dirty_buffer(jl->j_commit_bh);
1118 reiserfs_write_lock_nested(s, depth);
1119 }
1120
1121 /*
1122 * If there was a write error in the journal - we can't commit this
1123 * transaction - it will be invalid and, if successful, will just end
1124 * up propagating the write error out to the filesystem.
1125 */
1126 if (unlikely(!buffer_uptodate(jl->j_commit_bh))) {
1127 #ifdef CONFIG_REISERFS_CHECK
1128 reiserfs_warning(s, "journal-615", "buffer write failed");
1129 #endif
1130 retval = -EIO;
1131 }
1132 bforget(jl->j_commit_bh);
1133 if (journal->j_last_commit_id != 0 &&
1134 (jl->j_trans_id - journal->j_last_commit_id) != 1) {
1135 reiserfs_warning(s, "clm-2200", "last commit %lu, current %lu",
1136 journal->j_last_commit_id, jl->j_trans_id);
1137 }
1138 journal->j_last_commit_id = jl->j_trans_id;
1139
1140 /*
1141 * now, every commit block is on the disk. It is safe to allow
1142 * blocks freed during this transaction to be reallocated
1143 */
1144 cleanup_freed_for_journal_list(s, jl);
1145
1146 retval = retval ? retval : journal->j_errno;
1147
1148 /* mark the metadata dirty */
1149 if (!retval)
1150 dirty_one_transaction(s, jl);
1151 atomic_dec(&jl->j_commit_left);
1152
1153 if (flushall) {
1154 atomic_set(&jl->j_older_commits_done, 1);
1155 }
1156 mutex_unlock(&jl->j_commit_mutex);
1157 put_jl:
1158 put_journal_list(s, jl);
1159
1160 if (retval)
1161 reiserfs_abort(s, retval, "Journal write error in %s",
1162 __func__);
1163 return retval;
1164 }
1165
1166 /*
1167 * flush_journal_list frequently needs to find a newer transaction for a
1168 * given block. This does that, or returns NULL if it can't find anything
1169 */
1170 static struct reiserfs_journal_list *find_newer_jl_for_cn(struct
1171 reiserfs_journal_cnode
1172 *cn)
1173 {
1174 struct super_block *sb = cn->sb;
1175 b_blocknr_t blocknr = cn->blocknr;
1176
1177 cn = cn->hprev;
1178 while (cn) {
1179 if (cn->sb == sb && cn->blocknr == blocknr && cn->jlist) {
1180 return cn->jlist;
1181 }
1182 cn = cn->hprev;
1183 }
1184 return NULL;
1185 }
1186
1187 static void remove_journal_hash(struct super_block *,
1188 struct reiserfs_journal_cnode **,
1189 struct reiserfs_journal_list *, unsigned long,
1190 int);
1191
1192 /*
1193 * once all the real blocks have been flushed, it is safe to remove them
1194 * from the journal list for this transaction. Aside from freeing the
1195 * cnode, this also allows the block to be reallocated for data blocks
1196 * if it had been deleted.
1197 */
1198 static void remove_all_from_journal_list(struct super_block *sb,
1199 struct reiserfs_journal_list *jl,
1200 int debug)
1201 {
1202 struct reiserfs_journal *journal = SB_JOURNAL(sb);
1203 struct reiserfs_journal_cnode *cn, *last;
1204 cn = jl->j_realblock;
1205
1206 /*
1207 * which is better, to lock once around the whole loop, or
1208 * to lock for each call to remove_journal_hash?
1209 */
1210 while (cn) {
1211 if (cn->blocknr != 0) {
1212 if (debug) {
1213 reiserfs_warning(sb, "reiserfs-2201",
1214 "block %u, bh is %d, state %ld",
1215 cn->blocknr, cn->bh ? 1 : 0,
1216 cn->state);
1217 }
1218 cn->state = 0;
1219 remove_journal_hash(sb, journal->j_list_hash_table,
1220 jl, cn->blocknr, 1);
1221 }
1222 last = cn;
1223 cn = cn->next;
1224 free_cnode(sb, last);
1225 }
1226 jl->j_realblock = NULL;
1227 }
1228
1229 /*
1230 * if this timestamp is greater than the timestamp we wrote last to the
1231 * header block, write it to the header block. once this is done, I can
1232 * safely say the log area for this transaction won't ever be replayed,
1233 * and I can start releasing blocks in this transaction for reuse as data
1234 * blocks. called by flush_journal_list, before it calls
1235 * remove_all_from_journal_list
1236 */
1237 static int _update_journal_header_block(struct super_block *sb,
1238 unsigned long offset,
1239 unsigned int trans_id)
1240 {
1241 struct reiserfs_journal_header *jh;
1242 struct reiserfs_journal *journal = SB_JOURNAL(sb);
1243 int depth;
1244
1245 if (reiserfs_is_journal_aborted(journal))
1246 return -EIO;
1247
1248 if (trans_id >= journal->j_last_flush_trans_id) {
1249 if (buffer_locked((journal->j_header_bh))) {
1250 depth = reiserfs_write_unlock_nested(sb);
1251 __wait_on_buffer(journal->j_header_bh);
1252 reiserfs_write_lock_nested(sb, depth);
1253 if (unlikely(!buffer_uptodate(journal->j_header_bh))) {
1254 #ifdef CONFIG_REISERFS_CHECK
1255 reiserfs_warning(sb, "journal-699",
1256 "buffer write failed");
1257 #endif
1258 return -EIO;
1259 }
1260 }
1261 journal->j_last_flush_trans_id = trans_id;
1262 journal->j_first_unflushed_offset = offset;
1263 jh = (struct reiserfs_journal_header *)(journal->j_header_bh->
1264 b_data);
1265 jh->j_last_flush_trans_id = cpu_to_le32(trans_id);
1266 jh->j_first_unflushed_offset = cpu_to_le32(offset);
1267 jh->j_mount_id = cpu_to_le32(journal->j_mount_id);
1268
1269 set_buffer_dirty(journal->j_header_bh);
1270 depth = reiserfs_write_unlock_nested(sb);
1271
1272 if (reiserfs_barrier_flush(sb))
1273 __sync_dirty_buffer(journal->j_header_bh,
1274 REQ_SYNC | REQ_PREFLUSH | REQ_FUA);
1275 else
1276 sync_dirty_buffer(journal->j_header_bh);
1277
1278 reiserfs_write_lock_nested(sb, depth);
1279 if (!buffer_uptodate(journal->j_header_bh)) {
1280 reiserfs_warning(sb, "journal-837",
1281 "IO error during journal replay");
1282 return -EIO;
1283 }
1284 }
1285 return 0;
1286 }
1287
1288 static int update_journal_header_block(struct super_block *sb,
1289 unsigned long offset,
1290 unsigned int trans_id)
1291 {
1292 return _update_journal_header_block(sb, offset, trans_id);
1293 }
1294
1295 /*
1296 ** flush any and all journal lists older than you are
1297 ** can only be called from flush_journal_list
1298 */
1299 static int flush_older_journal_lists(struct super_block *sb,
1300 struct reiserfs_journal_list *jl)
1301 {
1302 struct list_head *entry;
1303 struct reiserfs_journal_list *other_jl;
1304 struct reiserfs_journal *journal = SB_JOURNAL(sb);
1305 unsigned int trans_id = jl->j_trans_id;
1306
1307 /*
1308 * we know we are the only ones flushing things, no extra race
1309 * protection is required.
1310 */
1311 restart:
1312 entry = journal->j_journal_list.next;
1313 /* Did we wrap? */
1314 if (entry == &journal->j_journal_list)
1315 return 0;
1316 other_jl = JOURNAL_LIST_ENTRY(entry);
1317 if (other_jl->j_trans_id < trans_id) {
1318 BUG_ON(other_jl->j_refcount <= 0);
1319 /* do not flush all */
1320 flush_journal_list(sb, other_jl, 0);
1321
1322 /* other_jl is now deleted from the list */
1323 goto restart;
1324 }
1325 return 0;
1326 }
1327
1328 static void del_from_work_list(struct super_block *s,
1329 struct reiserfs_journal_list *jl)
1330 {
1331 struct reiserfs_journal *journal = SB_JOURNAL(s);
1332 if (!list_empty(&jl->j_working_list)) {
1333 list_del_init(&jl->j_working_list);
1334 journal->j_num_work_lists--;
1335 }
1336 }
1337
1338 /*
1339 * flush a journal list, both commit and real blocks
1340 *
1341 * always set flushall to 1, unless you are calling from inside
1342 * flush_journal_list
1343 *
1344 * IMPORTANT. This can only be called while there are no journal writers,
1345 * and the journal is locked. That means it can only be called from
1346 * do_journal_end, or by journal_release
1347 */
1348 static int flush_journal_list(struct super_block *s,
1349 struct reiserfs_journal_list *jl, int flushall)
1350 {
1351 struct reiserfs_journal_list *pjl;
1352 struct reiserfs_journal_cnode *cn, *last;
1353 int count;
1354 int was_jwait = 0;
1355 int was_dirty = 0;
1356 struct buffer_head *saved_bh;
1357 unsigned long j_len_saved = jl->j_len;
1358 struct reiserfs_journal *journal = SB_JOURNAL(s);
1359 int err = 0;
1360 int depth;
1361
1362 BUG_ON(j_len_saved <= 0);
1363
1364 if (atomic_read(&journal->j_wcount) != 0) {
1365 reiserfs_warning(s, "clm-2048", "called with wcount %d",
1366 atomic_read(&journal->j_wcount));
1367 }
1368
1369 /* if flushall == 0, the lock is already held */
1370 if (flushall) {
1371 reiserfs_mutex_lock_safe(&journal->j_flush_mutex, s);
1372 } else if (mutex_trylock(&journal->j_flush_mutex)) {
1373 BUG();
1374 }
1375
1376 count = 0;
1377 if (j_len_saved > journal->j_trans_max) {
1378 reiserfs_panic(s, "journal-715", "length is %lu, trans id %lu",
1379 j_len_saved, jl->j_trans_id);
1380 return 0;
1381 }
1382
1383 /* if all the work is already done, get out of here */
1384 if (atomic_read(&jl->j_nonzerolen) <= 0 &&
1385 atomic_read(&jl->j_commit_left) <= 0) {
1386 goto flush_older_and_return;
1387 }
1388
1389 /*
1390 * start by putting the commit list on disk. This will also flush
1391 * the commit lists of any olders transactions
1392 */
1393 flush_commit_list(s, jl, 1);
1394
1395 if (!(jl->j_state & LIST_DIRTY)
1396 && !reiserfs_is_journal_aborted(journal))
1397 BUG();
1398
1399 /* are we done now? */
1400 if (atomic_read(&jl->j_nonzerolen) <= 0 &&
1401 atomic_read(&jl->j_commit_left) <= 0) {
1402 goto flush_older_and_return;
1403 }
1404
1405 /*
1406 * loop through each cnode, see if we need to write it,
1407 * or wait on a more recent transaction, or just ignore it
1408 */
1409 if (atomic_read(&journal->j_wcount) != 0) {
1410 reiserfs_panic(s, "journal-844", "journal list is flushing, "
1411 "wcount is not 0");
1412 }
1413 cn = jl->j_realblock;
1414 while (cn) {
1415 was_jwait = 0;
1416 was_dirty = 0;
1417 saved_bh = NULL;
1418 /* blocknr of 0 is no longer in the hash, ignore it */
1419 if (cn->blocknr == 0) {
1420 goto free_cnode;
1421 }
1422
1423 /*
1424 * This transaction failed commit.
1425 * Don't write out to the disk
1426 */
1427 if (!(jl->j_state & LIST_DIRTY))
1428 goto free_cnode;
1429
1430 pjl = find_newer_jl_for_cn(cn);
1431 /*
1432 * the order is important here. We check pjl to make sure we
1433 * don't clear BH_JDirty_wait if we aren't the one writing this
1434 * block to disk
1435 */
1436 if (!pjl && cn->bh) {
1437 saved_bh = cn->bh;
1438
1439 /*
1440 * we do this to make sure nobody releases the
1441 * buffer while we are working with it
1442 */
1443 get_bh(saved_bh);
1444
1445 if (buffer_journal_dirty(saved_bh)) {
1446 BUG_ON(!can_dirty(cn));
1447 was_jwait = 1;
1448 was_dirty = 1;
1449 } else if (can_dirty(cn)) {
1450 /*
1451 * everything with !pjl && jwait
1452 * should be writable
1453 */
1454 BUG();
1455 }
1456 }
1457
1458 /*
1459 * if someone has this block in a newer transaction, just make
1460 * sure they are committed, and don't try writing it to disk
1461 */
1462 if (pjl) {
1463 if (atomic_read(&pjl->j_commit_left))
1464 flush_commit_list(s, pjl, 1);
1465 goto free_cnode;
1466 }
1467
1468 /*
1469 * bh == NULL when the block got to disk on its own, OR,
1470 * the block got freed in a future transaction
1471 */
1472 if (saved_bh == NULL) {
1473 goto free_cnode;
1474 }
1475
1476 /*
1477 * this should never happen. kupdate_one_transaction has
1478 * this list locked while it works, so we should never see a
1479 * buffer here that is not marked JDirty_wait
1480 */
1481 if ((!was_jwait) && !buffer_locked(saved_bh)) {
1482 reiserfs_warning(s, "journal-813",
1483 "BAD! buffer %llu %cdirty %cjwait, "
1484 "not in a newer tranasction",
1485 (unsigned long long)saved_bh->
1486 b_blocknr, was_dirty ? ' ' : '!',
1487 was_jwait ? ' ' : '!');
1488 }
1489 if (was_dirty) {
1490 /*
1491 * we inc again because saved_bh gets decremented
1492 * at free_cnode
1493 */
1494 get_bh(saved_bh);
1495 set_bit(BLOCK_NEEDS_FLUSH, &cn->state);
1496 lock_buffer(saved_bh);
1497 BUG_ON(cn->blocknr != saved_bh->b_blocknr);
1498 if (buffer_dirty(saved_bh))
1499 submit_logged_buffer(saved_bh);
1500 else
1501 unlock_buffer(saved_bh);
1502 count++;
1503 } else {
1504 reiserfs_warning(s, "clm-2082",
1505 "Unable to flush buffer %llu in %s",
1506 (unsigned long long)saved_bh->
1507 b_blocknr, __func__);
1508 }
1509 free_cnode:
1510 last = cn;
1511 cn = cn->next;
1512 if (saved_bh) {
1513 /*
1514 * we incremented this to keep others from
1515 * taking the buffer head away
1516 */
1517 put_bh(saved_bh);
1518 if (atomic_read(&saved_bh->b_count) < 0) {
1519 reiserfs_warning(s, "journal-945",
1520 "saved_bh->b_count < 0");
1521 }
1522 }
1523 }
1524 if (count > 0) {
1525 cn = jl->j_realblock;
1526 while (cn) {
1527 if (test_bit(BLOCK_NEEDS_FLUSH, &cn->state)) {
1528 if (!cn->bh) {
1529 reiserfs_panic(s, "journal-1011",
1530 "cn->bh is NULL");
1531 }
1532
1533 depth = reiserfs_write_unlock_nested(s);
1534 __wait_on_buffer(cn->bh);
1535 reiserfs_write_lock_nested(s, depth);
1536
1537 if (!cn->bh) {
1538 reiserfs_panic(s, "journal-1012",
1539 "cn->bh is NULL");
1540 }
1541 if (unlikely(!buffer_uptodate(cn->bh))) {
1542 #ifdef CONFIG_REISERFS_CHECK
1543 reiserfs_warning(s, "journal-949",
1544 "buffer write failed");
1545 #endif
1546 err = -EIO;
1547 }
1548 /*
1549 * note, we must clear the JDirty_wait bit
1550 * after the up to date check, otherwise we
1551 * race against our flushpage routine
1552 */
1553 BUG_ON(!test_clear_buffer_journal_dirty
1554 (cn->bh));
1555
1556 /* drop one ref for us */
1557 put_bh(cn->bh);
1558 /* drop one ref for journal_mark_dirty */
1559 release_buffer_page(cn->bh);
1560 }
1561 cn = cn->next;
1562 }
1563 }
1564
1565 if (err)
1566 reiserfs_abort(s, -EIO,
1567 "Write error while pushing transaction to disk in %s",
1568 __func__);
1569 flush_older_and_return:
1570
1571 /*
1572 * before we can update the journal header block, we _must_ flush all
1573 * real blocks from all older transactions to disk. This is because
1574 * once the header block is updated, this transaction will not be
1575 * replayed after a crash
1576 */
1577 if (flushall) {
1578 flush_older_journal_lists(s, jl);
1579 }
1580
1581 err = journal->j_errno;
1582 /*
1583 * before we can remove everything from the hash tables for this
1584 * transaction, we must make sure it can never be replayed
1585 *
1586 * since we are only called from do_journal_end, we know for sure there
1587 * are no allocations going on while we are flushing journal lists. So,
1588 * we only need to update the journal header block for the last list
1589 * being flushed
1590 */
1591 if (!err && flushall) {
1592 err =
1593 update_journal_header_block(s,
1594 (jl->j_start + jl->j_len +
1595 2) % SB_ONDISK_JOURNAL_SIZE(s),
1596 jl->j_trans_id);
1597 if (err)
1598 reiserfs_abort(s, -EIO,
1599 "Write error while updating journal header in %s",
1600 __func__);
1601 }
1602 remove_all_from_journal_list(s, jl, 0);
1603 list_del_init(&jl->j_list);
1604 journal->j_num_lists--;
1605 del_from_work_list(s, jl);
1606
1607 if (journal->j_last_flush_id != 0 &&
1608 (jl->j_trans_id - journal->j_last_flush_id) != 1) {
1609 reiserfs_warning(s, "clm-2201", "last flush %lu, current %lu",
1610 journal->j_last_flush_id, jl->j_trans_id);
1611 }
1612 journal->j_last_flush_id = jl->j_trans_id;
1613
1614 /*
1615 * not strictly required since we are freeing the list, but it should
1616 * help find code using dead lists later on
1617 */
1618 jl->j_len = 0;
1619 atomic_set(&jl->j_nonzerolen, 0);
1620 jl->j_start = 0;
1621 jl->j_realblock = NULL;
1622 jl->j_commit_bh = NULL;
1623 jl->j_trans_id = 0;
1624 jl->j_state = 0;
1625 put_journal_list(s, jl);
1626 if (flushall)
1627 mutex_unlock(&journal->j_flush_mutex);
1628 return err;
1629 }
1630
1631 static int write_one_transaction(struct super_block *s,
1632 struct reiserfs_journal_list *jl,
1633 struct buffer_chunk *chunk)
1634 {
1635 struct reiserfs_journal_cnode *cn;
1636 int ret = 0;
1637
1638 jl->j_state |= LIST_TOUCHED;
1639 del_from_work_list(s, jl);
1640 if (jl->j_len == 0 || atomic_read(&jl->j_nonzerolen) == 0) {
1641 return 0;
1642 }
1643
1644 cn = jl->j_realblock;
1645 while (cn) {
1646 /*
1647 * if the blocknr == 0, this has been cleared from the hash,
1648 * skip it
1649 */
1650 if (cn->blocknr == 0) {
1651 goto next;
1652 }
1653 if (cn->bh && can_dirty(cn) && buffer_dirty(cn->bh)) {
1654 struct buffer_head *tmp_bh;
1655 /*
1656 * we can race against journal_mark_freed when we try
1657 * to lock_buffer(cn->bh), so we have to inc the buffer
1658 * count, and recheck things after locking
1659 */
1660 tmp_bh = cn->bh;
1661 get_bh(tmp_bh);
1662 lock_buffer(tmp_bh);
1663 if (cn->bh && can_dirty(cn) && buffer_dirty(tmp_bh)) {
1664 if (!buffer_journal_dirty(tmp_bh) ||
1665 buffer_journal_prepared(tmp_bh))
1666 BUG();
1667 add_to_chunk(chunk, tmp_bh, NULL, write_chunk);
1668 ret++;
1669 } else {
1670 /* note, cn->bh might be null now */
1671 unlock_buffer(tmp_bh);
1672 }
1673 put_bh(tmp_bh);
1674 }
1675 next:
1676 cn = cn->next;
1677 cond_resched();
1678 }
1679 return ret;
1680 }
1681
1682 /* used by flush_commit_list */
1683 static int dirty_one_transaction(struct super_block *s,
1684 struct reiserfs_journal_list *jl)
1685 {
1686 struct reiserfs_journal_cnode *cn;
1687 struct reiserfs_journal_list *pjl;
1688 int ret = 0;
1689
1690 jl->j_state |= LIST_DIRTY;
1691 cn = jl->j_realblock;
1692 while (cn) {
1693 /*
1694 * look for a more recent transaction that logged this
1695 * buffer. Only the most recent transaction with a buffer in
1696 * it is allowed to send that buffer to disk
1697 */
1698 pjl = find_newer_jl_for_cn(cn);
1699 if (!pjl && cn->blocknr && cn->bh
1700 && buffer_journal_dirty(cn->bh)) {
1701 BUG_ON(!can_dirty(cn));
1702 /*
1703 * if the buffer is prepared, it will either be logged
1704 * or restored. If restored, we need to make sure
1705 * it actually gets marked dirty
1706 */
1707 clear_buffer_journal_new(cn->bh);
1708 if (buffer_journal_prepared(cn->bh)) {
1709 set_buffer_journal_restore_dirty(cn->bh);
1710 } else {
1711 set_buffer_journal_test(cn->bh);
1712 mark_buffer_dirty(cn->bh);
1713 }
1714 }
1715 cn = cn->next;
1716 }
1717 return ret;
1718 }
1719
1720 static int kupdate_transactions(struct super_block *s,
1721 struct reiserfs_journal_list *jl,
1722 struct reiserfs_journal_list **next_jl,
1723 unsigned int *next_trans_id,
1724 int num_blocks, int num_trans)
1725 {
1726 int ret = 0;
1727 int written = 0;
1728 int transactions_flushed = 0;
1729 unsigned int orig_trans_id = jl->j_trans_id;
1730 struct buffer_chunk chunk;
1731 struct list_head *entry;
1732 struct reiserfs_journal *journal = SB_JOURNAL(s);
1733 chunk.nr = 0;
1734
1735 reiserfs_mutex_lock_safe(&journal->j_flush_mutex, s);
1736 if (!journal_list_still_alive(s, orig_trans_id)) {
1737 goto done;
1738 }
1739
1740 /*
1741 * we've got j_flush_mutex held, nobody is going to delete any
1742 * of these lists out from underneath us
1743 */
1744 while ((num_trans && transactions_flushed < num_trans) ||
1745 (!num_trans && written < num_blocks)) {
1746
1747 if (jl->j_len == 0 || (jl->j_state & LIST_TOUCHED) ||
1748 atomic_read(&jl->j_commit_left)
1749 || !(jl->j_state & LIST_DIRTY)) {
1750 del_from_work_list(s, jl);
1751 break;
1752 }
1753 ret = write_one_transaction(s, jl, &chunk);
1754
1755 if (ret < 0)
1756 goto done;
1757 transactions_flushed++;
1758 written += ret;
1759 entry = jl->j_list.next;
1760
1761 /* did we wrap? */
1762 if (entry == &journal->j_journal_list) {
1763 break;
1764 }
1765 jl = JOURNAL_LIST_ENTRY(entry);
1766
1767 /* don't bother with older transactions */
1768 if (jl->j_trans_id <= orig_trans_id)
1769 break;
1770 }
1771 if (chunk.nr) {
1772 write_chunk(&chunk);
1773 }
1774
1775 done:
1776 mutex_unlock(&journal->j_flush_mutex);
1777 return ret;
1778 }
1779
1780 /*
1781 * for o_sync and fsync heavy applications, they tend to use
1782 * all the journa list slots with tiny transactions. These
1783 * trigger lots and lots of calls to update the header block, which
1784 * adds seeks and slows things down.
1785 *
1786 * This function tries to clear out a large chunk of the journal lists
1787 * at once, which makes everything faster since only the newest journal
1788 * list updates the header block
1789 */
1790 static int flush_used_journal_lists(struct super_block *s,
1791 struct reiserfs_journal_list *jl)
1792 {
1793 unsigned long len = 0;
1794 unsigned long cur_len;
1795 int ret;
1796 int i;
1797 int limit = 256;
1798 struct reiserfs_journal_list *tjl;
1799 struct reiserfs_journal_list *flush_jl;
1800 unsigned int trans_id;
1801 struct reiserfs_journal *journal = SB_JOURNAL(s);
1802
1803 flush_jl = tjl = jl;
1804
1805 /* in data logging mode, try harder to flush a lot of blocks */
1806 if (reiserfs_data_log(s))
1807 limit = 1024;
1808 /* flush for 256 transactions or limit blocks, whichever comes first */
1809 for (i = 0; i < 256 && len < limit; i++) {
1810 if (atomic_read(&tjl->j_commit_left) ||
1811 tjl->j_trans_id < jl->j_trans_id) {
1812 break;
1813 }
1814 cur_len = atomic_read(&tjl->j_nonzerolen);
1815 if (cur_len > 0) {
1816 tjl->j_state &= ~LIST_TOUCHED;
1817 }
1818 len += cur_len;
1819 flush_jl = tjl;
1820 if (tjl->j_list.next == &journal->j_journal_list)
1821 break;
1822 tjl = JOURNAL_LIST_ENTRY(tjl->j_list.next);
1823 }
1824 get_journal_list(jl);
1825 get_journal_list(flush_jl);
1826
1827 /*
1828 * try to find a group of blocks we can flush across all the
1829 * transactions, but only bother if we've actually spanned
1830 * across multiple lists
1831 */
1832 if (flush_jl != jl) {
1833 ret = kupdate_transactions(s, jl, &tjl, &trans_id, len, i);
1834 }
1835 flush_journal_list(s, flush_jl, 1);
1836 put_journal_list(s, flush_jl);
1837 put_journal_list(s, jl);
1838 return 0;
1839 }
1840
1841 /*
1842 * removes any nodes in table with name block and dev as bh.
1843 * only touchs the hnext and hprev pointers.
1844 */
1845 void remove_journal_hash(struct super_block *sb,
1846 struct reiserfs_journal_cnode **table,
1847 struct reiserfs_journal_list *jl,
1848 unsigned long block, int remove_freed)
1849 {
1850 struct reiserfs_journal_cnode *cur;
1851 struct reiserfs_journal_cnode **head;
1852
1853 head = &(journal_hash(table, sb, block));
1854 if (!head) {
1855 return;
1856 }
1857 cur = *head;
1858 while (cur) {
1859 if (cur->blocknr == block && cur->sb == sb
1860 && (jl == NULL || jl == cur->jlist)
1861 && (!test_bit(BLOCK_FREED, &cur->state) || remove_freed)) {
1862 if (cur->hnext) {
1863 cur->hnext->hprev = cur->hprev;
1864 }
1865 if (cur->hprev) {
1866 cur->hprev->hnext = cur->hnext;
1867 } else {
1868 *head = cur->hnext;
1869 }
1870 cur->blocknr = 0;
1871 cur->sb = NULL;
1872 cur->state = 0;
1873 /*
1874 * anybody who clears the cur->bh will also
1875 * dec the nonzerolen
1876 */
1877 if (cur->bh && cur->jlist)
1878 atomic_dec(&cur->jlist->j_nonzerolen);
1879 cur->bh = NULL;
1880 cur->jlist = NULL;
1881 }
1882 cur = cur->hnext;
1883 }
1884 }
1885
1886 static void free_journal_ram(struct super_block *sb)
1887 {
1888 struct reiserfs_journal *journal = SB_JOURNAL(sb);
1889 kfree(journal->j_current_jl);
1890 journal->j_num_lists--;
1891
1892 vfree(journal->j_cnode_free_orig);
1893 free_list_bitmaps(sb, journal->j_list_bitmap);
1894 free_bitmap_nodes(sb); /* must be after free_list_bitmaps */
1895 if (journal->j_header_bh) {
1896 brelse(journal->j_header_bh);
1897 }
1898 /*
1899 * j_header_bh is on the journal dev, make sure
1900 * not to release the journal dev until we brelse j_header_bh
1901 */
1902 release_journal_dev(sb, journal);
1903 vfree(journal);
1904 }
1905
1906 /*
1907 * call on unmount. Only set error to 1 if you haven't made your way out
1908 * of read_super() yet. Any other caller must keep error at 0.
1909 */
1910 static int do_journal_release(struct reiserfs_transaction_handle *th,
1911 struct super_block *sb, int error)
1912 {
1913 struct reiserfs_transaction_handle myth;
1914 int flushed = 0;
1915 struct reiserfs_journal *journal = SB_JOURNAL(sb);
1916
1917 /*
1918 * we only want to flush out transactions if we were
1919 * called with error == 0
1920 */
1921 if (!error && !(sb->s_flags & MS_RDONLY)) {
1922 /* end the current trans */
1923 BUG_ON(!th->t_trans_id);
1924 do_journal_end(th, FLUSH_ALL);
1925
1926 /*
1927 * make sure something gets logged to force
1928 * our way into the flush code
1929 */
1930 if (!journal_join(&myth, sb)) {
1931 reiserfs_prepare_for_journal(sb,
1932 SB_BUFFER_WITH_SB(sb),
1933 1);
1934 journal_mark_dirty(&myth, SB_BUFFER_WITH_SB(sb));
1935 do_journal_end(&myth, FLUSH_ALL);
1936 flushed = 1;
1937 }
1938 }
1939
1940 /* this also catches errors during the do_journal_end above */
1941 if (!error && reiserfs_is_journal_aborted(journal)) {
1942 memset(&myth, 0, sizeof(myth));
1943 if (!journal_join_abort(&myth, sb)) {
1944 reiserfs_prepare_for_journal(sb,
1945 SB_BUFFER_WITH_SB(sb),
1946 1);
1947 journal_mark_dirty(&myth, SB_BUFFER_WITH_SB(sb));
1948 do_journal_end(&myth, FLUSH_ALL);
1949 }
1950 }
1951
1952
1953 /*
1954 * We must release the write lock here because
1955 * the workqueue job (flush_async_commit) needs this lock
1956 */
1957 reiserfs_write_unlock(sb);
1958
1959 /*
1960 * Cancel flushing of old commits. Note that neither of these works
1961 * will be requeued because superblock is being shutdown and doesn't
1962 * have MS_ACTIVE set.
1963 */
1964 reiserfs_cancel_old_flush(sb);
1965 /* wait for all commits to finish */
1966 cancel_delayed_work_sync(&SB_JOURNAL(sb)->j_work);
1967
1968 free_journal_ram(sb);
1969
1970 reiserfs_write_lock(sb);
1971
1972 return 0;
1973 }
1974
1975 /* * call on unmount. flush all journal trans, release all alloc'd ram */
1976 int journal_release(struct reiserfs_transaction_handle *th,
1977 struct super_block *sb)
1978 {
1979 return do_journal_release(th, sb, 0);
1980 }
1981
1982 /* only call from an error condition inside reiserfs_read_super! */
1983 int journal_release_error(struct reiserfs_transaction_handle *th,
1984 struct super_block *sb)
1985 {
1986 return do_journal_release(th, sb, 1);
1987 }
1988
1989 /*
1990 * compares description block with commit block.
1991 * returns 1 if they differ, 0 if they are the same
1992 */
1993 static int journal_compare_desc_commit(struct super_block *sb,
1994 struct reiserfs_journal_desc *desc,
1995 struct reiserfs_journal_commit *commit)
1996 {
1997 if (get_commit_trans_id(commit) != get_desc_trans_id(desc) ||
1998 get_commit_trans_len(commit) != get_desc_trans_len(desc) ||
1999 get_commit_trans_len(commit) > SB_JOURNAL(sb)->j_trans_max ||
2000 get_commit_trans_len(commit) <= 0) {
2001 return 1;
2002 }
2003 return 0;
2004 }
2005
2006 /*
2007 * returns 0 if it did not find a description block
2008 * returns -1 if it found a corrupt commit block
2009 * returns 1 if both desc and commit were valid
2010 * NOTE: only called during fs mount
2011 */
2012 static int journal_transaction_is_valid(struct super_block *sb,
2013 struct buffer_head *d_bh,
2014 unsigned int *oldest_invalid_trans_id,
2015 unsigned long *newest_mount_id)
2016 {
2017 struct reiserfs_journal_desc *desc;
2018 struct reiserfs_journal_commit *commit;
2019 struct buffer_head *c_bh;
2020 unsigned long offset;
2021
2022 if (!d_bh)
2023 return 0;
2024
2025 desc = (struct reiserfs_journal_desc *)d_bh->b_data;
2026 if (get_desc_trans_len(desc) > 0
2027 && !memcmp(get_journal_desc_magic(d_bh), JOURNAL_DESC_MAGIC, 8)) {
2028 if (oldest_invalid_trans_id && *oldest_invalid_trans_id
2029 && get_desc_trans_id(desc) > *oldest_invalid_trans_id) {
2030 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2031 "journal-986: transaction "
2032 "is valid returning because trans_id %d is greater than "
2033 "oldest_invalid %lu",
2034 get_desc_trans_id(desc),
2035 *oldest_invalid_trans_id);
2036 return 0;
2037 }
2038 if (newest_mount_id
2039 && *newest_mount_id > get_desc_mount_id(desc)) {
2040 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2041 "journal-1087: transaction "
2042 "is valid returning because mount_id %d is less than "
2043 "newest_mount_id %lu",
2044 get_desc_mount_id(desc),
2045 *newest_mount_id);
2046 return -1;
2047 }
2048 if (get_desc_trans_len(desc) > SB_JOURNAL(sb)->j_trans_max) {
2049 reiserfs_warning(sb, "journal-2018",
2050 "Bad transaction length %d "
2051 "encountered, ignoring transaction",
2052 get_desc_trans_len(desc));
2053 return -1;
2054 }
2055 offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2056
2057 /*
2058 * ok, we have a journal description block,
2059 * let's see if the transaction was valid
2060 */
2061 c_bh =
2062 journal_bread(sb,
2063 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2064 ((offset + get_desc_trans_len(desc) +
2065 1) % SB_ONDISK_JOURNAL_SIZE(sb)));
2066 if (!c_bh)
2067 return 0;
2068 commit = (struct reiserfs_journal_commit *)c_bh->b_data;
2069 if (journal_compare_desc_commit(sb, desc, commit)) {
2070 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2071 "journal_transaction_is_valid, commit offset %ld had bad "
2072 "time %d or length %d",
2073 c_bh->b_blocknr -
2074 SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2075 get_commit_trans_id(commit),
2076 get_commit_trans_len(commit));
2077 brelse(c_bh);
2078 if (oldest_invalid_trans_id) {
2079 *oldest_invalid_trans_id =
2080 get_desc_trans_id(desc);
2081 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2082 "journal-1004: "
2083 "transaction_is_valid setting oldest invalid trans_id "
2084 "to %d",
2085 get_desc_trans_id(desc));
2086 }
2087 return -1;
2088 }
2089 brelse(c_bh);
2090 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2091 "journal-1006: found valid "
2092 "transaction start offset %llu, len %d id %d",
2093 d_bh->b_blocknr -
2094 SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2095 get_desc_trans_len(desc),
2096 get_desc_trans_id(desc));
2097 return 1;
2098 } else {
2099 return 0;
2100 }
2101 }
2102
2103 static void brelse_array(struct buffer_head **heads, int num)
2104 {
2105 int i;
2106 for (i = 0; i < num; i++) {
2107 brelse(heads[i]);
2108 }
2109 }
2110
2111 /*
2112 * given the start, and values for the oldest acceptable transactions,
2113 * this either reads in a replays a transaction, or returns because the
2114 * transaction is invalid, or too old.
2115 * NOTE: only called during fs mount
2116 */
2117 static int journal_read_transaction(struct super_block *sb,
2118 unsigned long cur_dblock,
2119 unsigned long oldest_start,
2120 unsigned int oldest_trans_id,
2121 unsigned long newest_mount_id)
2122 {
2123 struct reiserfs_journal *journal = SB_JOURNAL(sb);
2124 struct reiserfs_journal_desc *desc;
2125 struct reiserfs_journal_commit *commit;
2126 unsigned int trans_id = 0;
2127 struct buffer_head *c_bh;
2128 struct buffer_head *d_bh;
2129 struct buffer_head **log_blocks = NULL;
2130 struct buffer_head **real_blocks = NULL;
2131 unsigned int trans_offset;
2132 int i;
2133 int trans_half;
2134
2135 d_bh = journal_bread(sb, cur_dblock);
2136 if (!d_bh)
2137 return 1;
2138 desc = (struct reiserfs_journal_desc *)d_bh->b_data;
2139 trans_offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2140 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1037: "
2141 "journal_read_transaction, offset %llu, len %d mount_id %d",
2142 d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2143 get_desc_trans_len(desc), get_desc_mount_id(desc));
2144 if (get_desc_trans_id(desc) < oldest_trans_id) {
2145 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1039: "
2146 "journal_read_trans skipping because %lu is too old",
2147 cur_dblock -
2148 SB_ONDISK_JOURNAL_1st_BLOCK(sb));
2149 brelse(d_bh);
2150 return 1;
2151 }
2152 if (get_desc_mount_id(desc) != newest_mount_id) {
2153 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1146: "
2154 "journal_read_trans skipping because %d is != "
2155 "newest_mount_id %lu", get_desc_mount_id(desc),
2156 newest_mount_id);
2157 brelse(d_bh);
2158 return 1;
2159 }
2160 c_bh = journal_bread(sb, SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2161 ((trans_offset + get_desc_trans_len(desc) + 1) %
2162 SB_ONDISK_JOURNAL_SIZE(sb)));
2163 if (!c_bh) {
2164 brelse(d_bh);
2165 return 1;
2166 }
2167 commit = (struct reiserfs_journal_commit *)c_bh->b_data;
2168 if (journal_compare_desc_commit(sb, desc, commit)) {
2169 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2170 "journal_read_transaction, "
2171 "commit offset %llu had bad time %d or length %d",
2172 c_bh->b_blocknr -
2173 SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2174 get_commit_trans_id(commit),
2175 get_commit_trans_len(commit));
2176 brelse(c_bh);
2177 brelse(d_bh);
2178 return 1;
2179 }
2180
2181 if (bdev_read_only(sb->s_bdev)) {
2182 reiserfs_warning(sb, "clm-2076",
2183 "device is readonly, unable to replay log");
2184 brelse(c_bh);
2185 brelse(d_bh);
2186 return -EROFS;
2187 }
2188
2189 trans_id = get_desc_trans_id(desc);
2190 /*
2191 * now we know we've got a good transaction, and it was
2192 * inside the valid time ranges
2193 */
2194 log_blocks = kmalloc(get_desc_trans_len(desc) *
2195 sizeof(struct buffer_head *), GFP_NOFS);
2196 real_blocks = kmalloc(get_desc_trans_len(desc) *
2197 sizeof(struct buffer_head *), GFP_NOFS);
2198 if (!log_blocks || !real_blocks) {
2199 brelse(c_bh);
2200 brelse(d_bh);
2201 kfree(log_blocks);
2202 kfree(real_blocks);
2203 reiserfs_warning(sb, "journal-1169",
2204 "kmalloc failed, unable to mount FS");
2205 return -1;
2206 }
2207 /* get all the buffer heads */
2208 trans_half = journal_trans_half(sb->s_blocksize);
2209 for (i = 0; i < get_desc_trans_len(desc); i++) {
2210 log_blocks[i] =
2211 journal_getblk(sb,
2212 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2213 (trans_offset + 1 +
2214 i) % SB_ONDISK_JOURNAL_SIZE(sb));
2215 if (i < trans_half) {
2216 real_blocks[i] =
2217 sb_getblk(sb,
2218 le32_to_cpu(desc->j_realblock[i]));
2219 } else {
2220 real_blocks[i] =
2221 sb_getblk(sb,
2222 le32_to_cpu(commit->
2223 j_realblock[i - trans_half]));
2224 }
2225 if (real_blocks[i]->b_blocknr > SB_BLOCK_COUNT(sb)) {
2226 reiserfs_warning(sb, "journal-1207",
2227 "REPLAY FAILURE fsck required! "
2228 "Block to replay is outside of "
2229 "filesystem");
2230 goto abort_replay;
2231 }
2232 /* make sure we don't try to replay onto log or reserved area */
2233 if (is_block_in_log_or_reserved_area
2234 (sb, real_blocks[i]->b_blocknr)) {
2235 reiserfs_warning(sb, "journal-1204",
2236 "REPLAY FAILURE fsck required! "
2237 "Trying to replay onto a log block");
2238 abort_replay:
2239 brelse_array(log_blocks, i);
2240 brelse_array(real_blocks, i);
2241 brelse(c_bh);
2242 brelse(d_bh);
2243 kfree(log_blocks);
2244 kfree(real_blocks);
2245 return -1;
2246 }
2247 }
2248 /* read in the log blocks, memcpy to the corresponding real block */
2249 ll_rw_block(REQ_OP_READ, 0, get_desc_trans_len(desc), log_blocks);
2250 for (i = 0; i < get_desc_trans_len(desc); i++) {
2251
2252 wait_on_buffer(log_blocks[i]);
2253 if (!buffer_uptodate(log_blocks[i])) {
2254 reiserfs_warning(sb, "journal-1212",
2255 "REPLAY FAILURE fsck required! "
2256 "buffer write failed");
2257 brelse_array(log_blocks + i,
2258 get_desc_trans_len(desc) - i);
2259 brelse_array(real_blocks, get_desc_trans_len(desc));
2260 brelse(c_bh);
2261 brelse(d_bh);
2262 kfree(log_blocks);
2263 kfree(real_blocks);
2264 return -1;
2265 }
2266 memcpy(real_blocks[i]->b_data, log_blocks[i]->b_data,
2267 real_blocks[i]->b_size);
2268 set_buffer_uptodate(real_blocks[i]);
2269 brelse(log_blocks[i]);
2270 }
2271 /* flush out the real blocks */
2272 for (i = 0; i < get_desc_trans_len(desc); i++) {
2273 set_buffer_dirty(real_blocks[i]);
2274 write_dirty_buffer(real_blocks[i], 0);
2275 }
2276 for (i = 0; i < get_desc_trans_len(desc); i++) {
2277 wait_on_buffer(real_blocks[i]);
2278 if (!buffer_uptodate(real_blocks[i])) {
2279 reiserfs_warning(sb, "journal-1226",
2280 "REPLAY FAILURE, fsck required! "
2281 "buffer write failed");
2282 brelse_array(real_blocks + i,
2283 get_desc_trans_len(desc) - i);
2284 brelse(c_bh);
2285 brelse(d_bh);
2286 kfree(log_blocks);
2287 kfree(real_blocks);
2288 return -1;
2289 }
2290 brelse(real_blocks[i]);
2291 }
2292 cur_dblock =
2293 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2294 ((trans_offset + get_desc_trans_len(desc) +
2295 2) % SB_ONDISK_JOURNAL_SIZE(sb));
2296 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2297 "journal-1095: setting journal " "start to offset %ld",
2298 cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb));
2299
2300 /*
2301 * init starting values for the first transaction, in case
2302 * this is the last transaction to be replayed.
2303 */
2304 journal->j_start = cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2305 journal->j_last_flush_trans_id = trans_id;
2306 journal->j_trans_id = trans_id + 1;
2307 /* check for trans_id overflow */
2308 if (journal->j_trans_id == 0)
2309 journal->j_trans_id = 10;
2310 brelse(c_bh);
2311 brelse(d_bh);
2312 kfree(log_blocks);
2313 kfree(real_blocks);
2314 return 0;
2315 }
2316
2317 /*
2318 * This function reads blocks starting from block and to max_block of bufsize
2319 * size (but no more than BUFNR blocks at a time). This proved to improve
2320 * mounting speed on self-rebuilding raid5 arrays at least.
2321 * Right now it is only used from journal code. But later we might use it
2322 * from other places.
2323 * Note: Do not use journal_getblk/sb_getblk functions here!
2324 */
2325 static struct buffer_head *reiserfs_breada(struct block_device *dev,
2326 b_blocknr_t block, int bufsize,
2327 b_blocknr_t max_block)
2328 {
2329 struct buffer_head *bhlist[BUFNR];
2330 unsigned int blocks = BUFNR;
2331 struct buffer_head *bh;
2332 int i, j;
2333
2334 bh = __getblk(dev, block, bufsize);
2335 if (buffer_uptodate(bh))
2336 return (bh);
2337
2338 if (block + BUFNR > max_block) {
2339 blocks = max_block - block;
2340 }
2341 bhlist[0] = bh;
2342 j = 1;
2343 for (i = 1; i < blocks; i++) {
2344 bh = __getblk(dev, block + i, bufsize);
2345 if (buffer_uptodate(bh)) {
2346 brelse(bh);
2347 break;
2348 } else
2349 bhlist[j++] = bh;
2350 }
2351 ll_rw_block(REQ_OP_READ, 0, j, bhlist);
2352 for (i = 1; i < j; i++)
2353 brelse(bhlist[i]);
2354 bh = bhlist[0];
2355 wait_on_buffer(bh);
2356 if (buffer_uptodate(bh))
2357 return bh;
2358 brelse(bh);
2359 return NULL;
2360 }
2361
2362 /*
2363 * read and replay the log
2364 * on a clean unmount, the journal header's next unflushed pointer will be
2365 * to an invalid transaction. This tests that before finding all the
2366 * transactions in the log, which makes normal mount times fast.
2367 *
2368 * After a crash, this starts with the next unflushed transaction, and
2369 * replays until it finds one too old, or invalid.
2370 *
2371 * On exit, it sets things up so the first transaction will work correctly.
2372 * NOTE: only called during fs mount
2373 */
2374 static int journal_read(struct super_block *sb)
2375 {
2376 struct reiserfs_journal *journal = SB_JOURNAL(sb);
2377 struct reiserfs_journal_desc *desc;
2378 unsigned int oldest_trans_id = 0;
2379 unsigned int oldest_invalid_trans_id = 0;
2380 time_t start;
2381 unsigned long oldest_start = 0;
2382 unsigned long cur_dblock = 0;
2383 unsigned long newest_mount_id = 9;
2384 struct buffer_head *d_bh;
2385 struct reiserfs_journal_header *jh;
2386 int valid_journal_header = 0;
2387 int replay_count = 0;
2388 int continue_replay = 1;
2389 int ret;
2390
2391 cur_dblock = SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2392 reiserfs_info(sb, "checking transaction log (%pg)\n",
2393 journal->j_dev_bd);
2394 start = get_seconds();
2395
2396 /*
2397 * step 1, read in the journal header block. Check the transaction
2398 * it says is the first unflushed, and if that transaction is not
2399 * valid, replay is done
2400 */
2401 journal->j_header_bh = journal_bread(sb,
2402 SB_ONDISK_JOURNAL_1st_BLOCK(sb)
2403 + SB_ONDISK_JOURNAL_SIZE(sb));
2404 if (!journal->j_header_bh) {
2405 return 1;
2406 }
2407 jh = (struct reiserfs_journal_header *)(journal->j_header_bh->b_data);
2408 if (le32_to_cpu(jh->j_first_unflushed_offset) <
2409 SB_ONDISK_JOURNAL_SIZE(sb)
2410 && le32_to_cpu(jh->j_last_flush_trans_id) > 0) {
2411 oldest_start =
2412 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2413 le32_to_cpu(jh->j_first_unflushed_offset);
2414 oldest_trans_id = le32_to_cpu(jh->j_last_flush_trans_id) + 1;
2415 newest_mount_id = le32_to_cpu(jh->j_mount_id);
2416 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2417 "journal-1153: found in "
2418 "header: first_unflushed_offset %d, last_flushed_trans_id "
2419 "%lu", le32_to_cpu(jh->j_first_unflushed_offset),
2420 le32_to_cpu(jh->j_last_flush_trans_id));
2421 valid_journal_header = 1;
2422
2423 /*
2424 * now, we try to read the first unflushed offset. If it
2425 * is not valid, there is nothing more we can do, and it
2426 * makes no sense to read through the whole log.
2427 */
2428 d_bh =
2429 journal_bread(sb,
2430 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2431 le32_to_cpu(jh->j_first_unflushed_offset));
2432 ret = journal_transaction_is_valid(sb, d_bh, NULL, NULL);
2433 if (!ret) {
2434 continue_replay = 0;
2435 }
2436 brelse(d_bh);
2437 goto start_log_replay;
2438 }
2439
2440 /*
2441 * ok, there are transactions that need to be replayed. start
2442 * with the first log block, find all the valid transactions, and
2443 * pick out the oldest.
2444 */
2445 while (continue_replay
2446 && cur_dblock <
2447 (SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2448 SB_ONDISK_JOURNAL_SIZE(sb))) {
2449 /*
2450 * Note that it is required for blocksize of primary fs
2451 * device and journal device to be the same
2452 */
2453 d_bh =
2454 reiserfs_breada(journal->j_dev_bd, cur_dblock,
2455 sb->s_blocksize,
2456 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2457 SB_ONDISK_JOURNAL_SIZE(sb));
2458 ret =
2459 journal_transaction_is_valid(sb, d_bh,
2460 &oldest_invalid_trans_id,
2461 &newest_mount_id);
2462 if (ret == 1) {
2463 desc = (struct reiserfs_journal_desc *)d_bh->b_data;
2464 if (oldest_start == 0) { /* init all oldest_ values */
2465 oldest_trans_id = get_desc_trans_id(desc);
2466 oldest_start = d_bh->b_blocknr;
2467 newest_mount_id = get_desc_mount_id(desc);
2468 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2469 "journal-1179: Setting "
2470 "oldest_start to offset %llu, trans_id %lu",
2471 oldest_start -
2472 SB_ONDISK_JOURNAL_1st_BLOCK
2473 (sb), oldest_trans_id);
2474 } else if (oldest_trans_id > get_desc_trans_id(desc)) {
2475 /* one we just read was older */
2476 oldest_trans_id = get_desc_trans_id(desc);
2477 oldest_start = d_bh->b_blocknr;
2478 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2479 "journal-1180: Resetting "
2480 "oldest_start to offset %lu, trans_id %lu",
2481 oldest_start -
2482 SB_ONDISK_JOURNAL_1st_BLOCK
2483 (sb), oldest_trans_id);
2484 }
2485 if (newest_mount_id < get_desc_mount_id(desc)) {
2486 newest_mount_id = get_desc_mount_id(desc);
2487 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2488 "journal-1299: Setting "
2489 "newest_mount_id to %d",
2490 get_desc_mount_id(desc));
2491 }
2492 cur_dblock += get_desc_trans_len(desc) + 2;
2493 } else {
2494 cur_dblock++;
2495 }
2496 brelse(d_bh);
2497 }
2498
2499 start_log_replay:
2500 cur_dblock = oldest_start;
2501 if (oldest_trans_id) {
2502 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2503 "journal-1206: Starting replay "
2504 "from offset %llu, trans_id %lu",
2505 cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2506 oldest_trans_id);
2507
2508 }
2509 replay_count = 0;
2510 while (continue_replay && oldest_trans_id > 0) {
2511 ret =
2512 journal_read_transaction(sb, cur_dblock, oldest_start,
2513 oldest_trans_id, newest_mount_id);
2514 if (ret < 0) {
2515 return ret;
2516 } else if (ret != 0) {
2517 break;
2518 }
2519 cur_dblock =
2520 SB_ONDISK_JOURNAL_1st_BLOCK(sb) + journal->j_start;
2521 replay_count++;
2522 if (cur_dblock == oldest_start)
2523 break;
2524 }
2525
2526 if (oldest_trans_id == 0) {
2527 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2528 "journal-1225: No valid " "transactions found");
2529 }
2530 /*
2531 * j_start does not get set correctly if we don't replay any
2532 * transactions. if we had a valid journal_header, set j_start
2533 * to the first unflushed transaction value, copy the trans_id
2534 * from the header
2535 */
2536 if (valid_journal_header && replay_count == 0) {
2537 journal->j_start = le32_to_cpu(jh->j_first_unflushed_offset);
2538 journal->j_trans_id =
2539 le32_to_cpu(jh->j_last_flush_trans_id) + 1;
2540 /* check for trans_id overflow */
2541 if (journal->j_trans_id == 0)
2542 journal->j_trans_id = 10;
2543 journal->j_last_flush_trans_id =
2544 le32_to_cpu(jh->j_last_flush_trans_id);
2545 journal->j_mount_id = le32_to_cpu(jh->j_mount_id) + 1;
2546 } else {
2547 journal->j_mount_id = newest_mount_id + 1;
2548 }
2549 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1299: Setting "
2550 "newest_mount_id to %lu", journal->j_mount_id);
2551 journal->j_first_unflushed_offset = journal->j_start;
2552 if (replay_count > 0) {
2553 reiserfs_info(sb,
2554 "replayed %d transactions in %lu seconds\n",
2555 replay_count, get_seconds() - start);
2556 }
2557 /* needed to satisfy the locking in _update_journal_header_block */
2558 reiserfs_write_lock(sb);
2559 if (!bdev_read_only(sb->s_bdev) &&
2560 _update_journal_header_block(sb, journal->j_start,
2561 journal->j_last_flush_trans_id)) {
2562 reiserfs_write_unlock(sb);
2563 /*
2564 * replay failed, caller must call free_journal_ram and abort
2565 * the mount
2566 */
2567 return -1;
2568 }
2569 reiserfs_write_unlock(sb);
2570 return 0;
2571 }
2572
2573 static struct reiserfs_journal_list *alloc_journal_list(struct super_block *s)
2574 {
2575 struct reiserfs_journal_list *jl;
2576 jl = kzalloc(sizeof(struct reiserfs_journal_list),
2577 GFP_NOFS | __GFP_NOFAIL);
2578 INIT_LIST_HEAD(&jl->j_list);
2579 INIT_LIST_HEAD(&jl->j_working_list);
2580 INIT_LIST_HEAD(&jl->j_tail_bh_list);
2581 INIT_LIST_HEAD(&jl->j_bh_list);
2582 mutex_init(&jl->j_commit_mutex);
2583 SB_JOURNAL(s)->j_num_lists++;
2584 get_journal_list(jl);
2585 return jl;
2586 }
2587
2588 static void journal_list_init(struct super_block *sb)
2589 {
2590 SB_JOURNAL(sb)->j_current_jl = alloc_journal_list(sb);
2591 }
2592
2593 static void release_journal_dev(struct super_block *super,
2594 struct reiserfs_journal *journal)
2595 {
2596 if (journal->j_dev_bd != NULL) {
2597 blkdev_put(journal->j_dev_bd, journal->j_dev_mode);
2598 journal->j_dev_bd = NULL;
2599 }
2600 }
2601
2602 static int journal_init_dev(struct super_block *super,
2603 struct reiserfs_journal *journal,
2604 const char *jdev_name)
2605 {
2606 int result;
2607 dev_t jdev;
2608 fmode_t blkdev_mode = FMODE_READ | FMODE_WRITE | FMODE_EXCL;
2609 char b[BDEVNAME_SIZE];
2610
2611 result = 0;
2612
2613 journal->j_dev_bd = NULL;
2614 jdev = SB_ONDISK_JOURNAL_DEVICE(super) ?
2615 new_decode_dev(SB_ONDISK_JOURNAL_DEVICE(super)) : super->s_dev;
2616
2617 if (bdev_read_only(super->s_bdev))
2618 blkdev_mode = FMODE_READ;
2619
2620 /* there is no "jdev" option and journal is on separate device */
2621 if ((!jdev_name || !jdev_name[0])) {
2622 if (jdev == super->s_dev)
2623 blkdev_mode &= ~FMODE_EXCL;
2624 journal->j_dev_bd = blkdev_get_by_dev(jdev, blkdev_mode,
2625 journal);
2626 journal->j_dev_mode = blkdev_mode;
2627 if (IS_ERR(journal->j_dev_bd)) {
2628 result = PTR_ERR(journal->j_dev_bd);
2629 journal->j_dev_bd = NULL;
2630 reiserfs_warning(super, "sh-458",
2631 "cannot init journal device '%s': %i",
2632 __bdevname(jdev, b), result);
2633 return result;
2634 } else if (jdev != super->s_dev)
2635 set_blocksize(journal->j_dev_bd, super->s_blocksize);
2636
2637 return 0;
2638 }
2639
2640 journal->j_dev_mode = blkdev_mode;
2641 journal->j_dev_bd = blkdev_get_by_path(jdev_name, blkdev_mode, journal);
2642 if (IS_ERR(journal->j_dev_bd)) {
2643 result = PTR_ERR(journal->j_dev_bd);
2644 journal->j_dev_bd = NULL;
2645 reiserfs_warning(super,
2646 "journal_init_dev: Cannot open '%s': %i",
2647 jdev_name, result);
2648 return result;
2649 }
2650
2651 set_blocksize(journal->j_dev_bd, super->s_blocksize);
2652 reiserfs_info(super,
2653 "journal_init_dev: journal device: %pg\n",
2654 journal->j_dev_bd);
2655 return 0;
2656 }
2657
2658 /*
2659 * When creating/tuning a file system user can assign some
2660 * journal params within boundaries which depend on the ratio
2661 * blocksize/standard_blocksize.
2662 *
2663 * For blocks >= standard_blocksize transaction size should
2664 * be not less then JOURNAL_TRANS_MIN_DEFAULT, and not more
2665 * then JOURNAL_TRANS_MAX_DEFAULT.
2666 *
2667 * For blocks < standard_blocksize these boundaries should be
2668 * decreased proportionally.
2669 */
2670 #define REISERFS_STANDARD_BLKSIZE (4096)
2671
2672 static int check_advise_trans_params(struct super_block *sb,
2673 struct reiserfs_journal *journal)
2674 {
2675 if (journal->j_trans_max) {
2676 /* Non-default journal params. Do sanity check for them. */
2677 int ratio = 1;
2678 if (sb->s_blocksize < REISERFS_STANDARD_BLKSIZE)
2679 ratio = REISERFS_STANDARD_BLKSIZE / sb->s_blocksize;
2680
2681 if (journal->j_trans_max > JOURNAL_TRANS_MAX_DEFAULT / ratio ||
2682 journal->j_trans_max < JOURNAL_TRANS_MIN_DEFAULT / ratio ||
2683 SB_ONDISK_JOURNAL_SIZE(sb) / journal->j_trans_max <
2684 JOURNAL_MIN_RATIO) {
2685 reiserfs_warning(sb, "sh-462",
2686 "bad transaction max size (%u). "
2687 "FSCK?", journal->j_trans_max);
2688 return 1;
2689 }
2690 if (journal->j_max_batch != (journal->j_trans_max) *
2691 JOURNAL_MAX_BATCH_DEFAULT/JOURNAL_TRANS_MAX_DEFAULT) {
2692 reiserfs_warning(sb, "sh-463",
2693 "bad transaction max batch (%u). "
2694 "FSCK?", journal->j_max_batch);
2695 return 1;
2696 }
2697 } else {
2698 /*
2699 * Default journal params.
2700 * The file system was created by old version
2701 * of mkreiserfs, so some fields contain zeros,
2702 * and we need to advise proper values for them
2703 */
2704 if (sb->s_blocksize != REISERFS_STANDARD_BLKSIZE) {
2705 reiserfs_warning(sb, "sh-464", "bad blocksize (%u)",
2706 sb->s_blocksize);
2707 return 1;
2708 }
2709 journal->j_trans_max = JOURNAL_TRANS_MAX_DEFAULT;
2710 journal->j_max_batch = JOURNAL_MAX_BATCH_DEFAULT;
2711 journal->j_max_commit_age = JOURNAL_MAX_COMMIT_AGE;
2712 }
2713 return 0;
2714 }
2715
2716 /* must be called once on fs mount. calls journal_read for you */
2717 int journal_init(struct super_block *sb, const char *j_dev_name,
2718 int old_format, unsigned int commit_max_age)
2719 {
2720 int num_cnodes = SB_ONDISK_JOURNAL_SIZE(sb) * 2;
2721 struct buffer_head *bhjh;
2722 struct reiserfs_super_block *rs;
2723 struct reiserfs_journal_header *jh;
2724 struct reiserfs_journal *journal;
2725 struct reiserfs_journal_list *jl;
2726 int ret;
2727
2728 journal = SB_JOURNAL(sb) = vzalloc(sizeof(struct reiserfs_journal));
2729 if (!journal) {
2730 reiserfs_warning(sb, "journal-1256",
2731 "unable to get memory for journal structure");
2732 return 1;
2733 }
2734 INIT_LIST_HEAD(&journal->j_bitmap_nodes);
2735 INIT_LIST_HEAD(&journal->j_prealloc_list);
2736 INIT_LIST_HEAD(&journal->j_working_list);
2737 INIT_LIST_HEAD(&journal->j_journal_list);
2738 journal->j_persistent_trans = 0;
2739 if (reiserfs_allocate_list_bitmaps(sb, journal->j_list_bitmap,
2740 reiserfs_bmap_count(sb)))
2741 goto free_and_return;
2742
2743 allocate_bitmap_nodes(sb);
2744
2745 /* reserved for journal area support */
2746 SB_JOURNAL_1st_RESERVED_BLOCK(sb) = (old_format ?
2747 REISERFS_OLD_DISK_OFFSET_IN_BYTES
2748 / sb->s_blocksize +
2749 reiserfs_bmap_count(sb) +
2750 1 :
2751 REISERFS_DISK_OFFSET_IN_BYTES /
2752 sb->s_blocksize + 2);
2753
2754 /*
2755 * Sanity check to see is the standard journal fitting
2756 * within first bitmap (actual for small blocksizes)
2757 */
2758 if (!SB_ONDISK_JOURNAL_DEVICE(sb) &&
2759 (SB_JOURNAL_1st_RESERVED_BLOCK(sb) +
2760 SB_ONDISK_JOURNAL_SIZE(sb) > sb->s_blocksize * 8)) {
2761 reiserfs_warning(sb, "journal-1393",
2762 "journal does not fit for area addressed "
2763 "by first of bitmap blocks. It starts at "
2764 "%u and its size is %u. Block size %ld",
2765 SB_JOURNAL_1st_RESERVED_BLOCK(sb),
2766 SB_ONDISK_JOURNAL_SIZE(sb),
2767 sb->s_blocksize);
2768 goto free_and_return;
2769 }
2770
2771 if (journal_init_dev(sb, journal, j_dev_name) != 0) {
2772 reiserfs_warning(sb, "sh-462",
2773 "unable to initialize journal device");
2774 goto free_and_return;
2775 }
2776
2777 rs = SB_DISK_SUPER_BLOCK(sb);
2778
2779 /* read journal header */
2780 bhjh = journal_bread(sb,
2781 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2782 SB_ONDISK_JOURNAL_SIZE(sb));
2783 if (!bhjh) {
2784 reiserfs_warning(sb, "sh-459",
2785 "unable to read journal header");
2786 goto free_and_return;
2787 }
2788 jh = (struct reiserfs_journal_header *)(bhjh->b_data);
2789
2790 /* make sure that journal matches to the super block */
2791 if (is_reiserfs_jr(rs)
2792 && (le32_to_cpu(jh->jh_journal.jp_journal_magic) !=
2793 sb_jp_journal_magic(rs))) {
2794 reiserfs_warning(sb, "sh-460",
2795 "journal header magic %x (device %pg) does "
2796 "not match to magic found in super block %x",
2797 jh->jh_journal.jp_journal_magic,
2798 journal->j_dev_bd,
2799 sb_jp_journal_magic(rs));
2800 brelse(bhjh);
2801 goto free_and_return;
2802 }
2803
2804 journal->j_trans_max = le32_to_cpu(jh->jh_journal.jp_journal_trans_max);
2805 journal->j_max_batch = le32_to_cpu(jh->jh_journal.jp_journal_max_batch);
2806 journal->j_max_commit_age =
2807 le32_to_cpu(jh->jh_journal.jp_journal_max_commit_age);
2808 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
2809
2810 if (check_advise_trans_params(sb, journal) != 0)
2811 goto free_and_return;
2812 journal->j_default_max_commit_age = journal->j_max_commit_age;
2813
2814 if (commit_max_age != 0) {
2815 journal->j_max_commit_age = commit_max_age;
2816 journal->j_max_trans_age = commit_max_age;
2817 }
2818
2819 reiserfs_info(sb, "journal params: device %pg, size %u, "
2820 "journal first block %u, max trans len %u, max batch %u, "
2821 "max commit age %u, max trans age %u\n",
2822 journal->j_dev_bd,
2823 SB_ONDISK_JOURNAL_SIZE(sb),
2824 SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2825 journal->j_trans_max,
2826 journal->j_max_batch,
2827 journal->j_max_commit_age, journal->j_max_trans_age);
2828
2829 brelse(bhjh);
2830
2831 journal->j_list_bitmap_index = 0;
2832 journal_list_init(sb);
2833
2834 memset(journal->j_list_hash_table, 0,
2835 JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *));
2836
2837 INIT_LIST_HEAD(&journal->j_dirty_buffers);
2838 spin_lock_init(&journal->j_dirty_buffers_lock);
2839
2840 journal->j_start = 0;
2841 journal->j_len = 0;
2842 journal->j_len_alloc = 0;
2843 atomic_set(&journal->j_wcount, 0);
2844 atomic_set(&journal->j_async_throttle, 0);
2845 journal->j_bcount = 0;
2846 journal->j_trans_start_time = 0;
2847 journal->j_last = NULL;
2848 journal->j_first = NULL;
2849 init_waitqueue_head(&journal->j_join_wait);
2850 mutex_init(&journal->j_mutex);
2851 mutex_init(&journal->j_flush_mutex);
2852
2853 journal->j_trans_id = 10;
2854 journal->j_mount_id = 10;
2855 journal->j_state = 0;
2856 atomic_set(&journal->j_jlock, 0);
2857 journal->j_cnode_free_list = allocate_cnodes(num_cnodes);
2858 journal->j_cnode_free_orig = journal->j_cnode_free_list;
2859 journal->j_cnode_free = journal->j_cnode_free_list ? num_cnodes : 0;
2860 journal->j_cnode_used = 0;
2861 journal->j_must_wait = 0;
2862
2863 if (journal->j_cnode_free == 0) {
2864 reiserfs_warning(sb, "journal-2004", "Journal cnode memory "
2865 "allocation failed (%ld bytes). Journal is "
2866 "too large for available memory. Usually "
2867 "this is due to a journal that is too large.",
2868 sizeof (struct reiserfs_journal_cnode) * num_cnodes);
2869 goto free_and_return;
2870 }
2871
2872 init_journal_hash(sb);
2873 jl = journal->j_current_jl;
2874
2875 /*
2876 * get_list_bitmap() may call flush_commit_list() which
2877 * requires the lock. Calling flush_commit_list() shouldn't happen
2878 * this early but I like to be paranoid.
2879 */
2880 reiserfs_write_lock(sb);
2881 jl->j_list_bitmap = get_list_bitmap(sb, jl);
2882 reiserfs_write_unlock(sb);
2883 if (!jl->j_list_bitmap) {
2884 reiserfs_warning(sb, "journal-2005",
2885 "get_list_bitmap failed for journal list 0");
2886 goto free_and_return;
2887 }
2888
2889 ret = journal_read(sb);
2890 if (ret < 0) {
2891 reiserfs_warning(sb, "reiserfs-2006",
2892 "Replay Failure, unable to mount");
2893 goto free_and_return;
2894 }
2895
2896 INIT_DELAYED_WORK(&journal->j_work, flush_async_commits);
2897 journal->j_work_sb = sb;
2898 return 0;
2899 free_and_return:
2900 free_journal_ram(sb);
2901 return 1;
2902 }
2903
2904 /*
2905 * test for a polite end of the current transaction. Used by file_write,
2906 * and should be used by delete to make sure they don't write more than
2907 * can fit inside a single transaction
2908 */
2909 int journal_transaction_should_end(struct reiserfs_transaction_handle *th,
2910 int new_alloc)
2911 {
2912 struct reiserfs_journal *journal = SB_JOURNAL(th->t_super);
2913 time_t now = get_seconds();
2914 /* cannot restart while nested */
2915 BUG_ON(!th->t_trans_id);
2916 if (th->t_refcount > 1)
2917 return 0;
2918 if (journal->j_must_wait > 0 ||
2919 (journal->j_len_alloc + new_alloc) >= journal->j_max_batch ||
2920 atomic_read(&journal->j_jlock) ||
2921 (now - journal->j_trans_start_time) > journal->j_max_trans_age ||
2922 journal->j_cnode_free < (journal->j_trans_max * 3)) {
2923 return 1;
2924 }
2925
2926 journal->j_len_alloc += new_alloc;
2927 th->t_blocks_allocated += new_alloc ;
2928 return 0;
2929 }
2930
2931 /* this must be called inside a transaction */
2932 void reiserfs_block_writes(struct reiserfs_transaction_handle *th)
2933 {
2934 struct reiserfs_journal *journal = SB_JOURNAL(th->t_super);
2935 BUG_ON(!th->t_trans_id);
2936 journal->j_must_wait = 1;
2937 set_bit(J_WRITERS_BLOCKED, &journal->j_state);
2938 return;
2939 }
2940
2941 /* this must be called without a transaction started */
2942 void reiserfs_allow_writes(struct super_block *s)
2943 {
2944 struct reiserfs_journal *journal = SB_JOURNAL(s);
2945 clear_bit(J_WRITERS_BLOCKED, &journal->j_state);
2946 wake_up(&journal->j_join_wait);
2947 }
2948
2949 /* this must be called without a transaction started */
2950 void reiserfs_wait_on_write_block(struct super_block *s)
2951 {
2952 struct reiserfs_journal *journal = SB_JOURNAL(s);
2953 wait_event(journal->j_join_wait,
2954 !test_bit(J_WRITERS_BLOCKED, &journal->j_state));
2955 }
2956
2957 static void queue_log_writer(struct super_block *s)
2958 {
2959 wait_queue_t wait;
2960 struct reiserfs_journal *journal = SB_JOURNAL(s);
2961 set_bit(J_WRITERS_QUEUED, &journal->j_state);
2962
2963 /*
2964 * we don't want to use wait_event here because
2965 * we only want to wait once.
2966 */
2967 init_waitqueue_entry(&wait, current);
2968 add_wait_queue(&journal->j_join_wait, &wait);
2969 set_current_state(TASK_UNINTERRUPTIBLE);
2970 if (test_bit(J_WRITERS_QUEUED, &journal->j_state)) {
2971 int depth = reiserfs_write_unlock_nested(s);
2972 schedule();
2973 reiserfs_write_lock_nested(s, depth);
2974 }
2975 __set_current_state(TASK_RUNNING);
2976 remove_wait_queue(&journal->j_join_wait, &wait);
2977 }
2978
2979 static void wake_queued_writers(struct super_block *s)
2980 {
2981 struct reiserfs_journal *journal = SB_JOURNAL(s);
2982 if (test_and_clear_bit(J_WRITERS_QUEUED, &journal->j_state))
2983 wake_up(&journal->j_join_wait);
2984 }
2985
2986 static void let_transaction_grow(struct super_block *sb, unsigned int trans_id)
2987 {
2988 struct reiserfs_journal *journal = SB_JOURNAL(sb);
2989 unsigned long bcount = journal->j_bcount;
2990 while (1) {
2991 int depth;
2992
2993 depth = reiserfs_write_unlock_nested(sb);
2994 schedule_timeout_uninterruptible(1);
2995 reiserfs_write_lock_nested(sb, depth);
2996
2997 journal->j_current_jl->j_state |= LIST_COMMIT_PENDING;
2998 while ((atomic_read(&journal->j_wcount) > 0 ||
2999 atomic_read(&journal->j_jlock)) &&
3000 journal->j_trans_id == trans_id) {
3001 queue_log_writer(sb);
3002 }
3003 if (journal->j_trans_id != trans_id)
3004 break;
3005 if (bcount == journal->j_bcount)
3006 break;
3007 bcount = journal->j_bcount;
3008 }
3009 }
3010
3011 /*
3012 * join == true if you must join an existing transaction.
3013 * join == false if you can deal with waiting for others to finish
3014 *
3015 * this will block until the transaction is joinable. send the number of
3016 * blocks you expect to use in nblocks.
3017 */
3018 static int do_journal_begin_r(struct reiserfs_transaction_handle *th,
3019 struct super_block *sb, unsigned long nblocks,
3020 int join)
3021 {
3022 time_t now = get_seconds();
3023 unsigned int old_trans_id;
3024 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3025 struct reiserfs_transaction_handle myth;
3026 int sched_count = 0;
3027 int retval;
3028 int depth;
3029
3030 reiserfs_check_lock_depth(sb, "journal_begin");
3031 BUG_ON(nblocks > journal->j_trans_max);
3032
3033 PROC_INFO_INC(sb, journal.journal_being);
3034 /* set here for journal_join */
3035 th->t_refcount = 1;
3036 th->t_super = sb;
3037
3038 relock:
3039 lock_journal(sb);
3040 if (join != JBEGIN_ABORT && reiserfs_is_journal_aborted(journal)) {
3041 unlock_journal(sb);
3042 retval = journal->j_errno;
3043 goto out_fail;
3044 }
3045 journal->j_bcount++;
3046
3047 if (test_bit(J_WRITERS_BLOCKED, &journal->j_state)) {
3048 unlock_journal(sb);
3049 depth = reiserfs_write_unlock_nested(sb);
3050 reiserfs_wait_on_write_block(sb);
3051 reiserfs_write_lock_nested(sb, depth);
3052 PROC_INFO_INC(sb, journal.journal_relock_writers);
3053 goto relock;
3054 }
3055 now = get_seconds();
3056
3057 /*
3058 * if there is no room in the journal OR
3059 * if this transaction is too old, and we weren't called joinable,
3060 * wait for it to finish before beginning we don't sleep if there
3061 * aren't other writers
3062 */
3063
3064 if ((!join && journal->j_must_wait > 0) ||
3065 (!join
3066 && (journal->j_len_alloc + nblocks + 2) >= journal->j_max_batch)
3067 || (!join && atomic_read(&journal->j_wcount) > 0
3068 && journal->j_trans_start_time > 0
3069 && (now - journal->j_trans_start_time) >
3070 journal->j_max_trans_age) || (!join
3071 && atomic_read(&journal->j_jlock))
3072 || (!join && journal->j_cnode_free < (journal->j_trans_max * 3))) {
3073
3074 old_trans_id = journal->j_trans_id;
3075 /* allow others to finish this transaction */
3076 unlock_journal(sb);
3077
3078 if (!join && (journal->j_len_alloc + nblocks + 2) >=
3079 journal->j_max_batch &&
3080 ((journal->j_len + nblocks + 2) * 100) <
3081 (journal->j_len_alloc * 75)) {
3082 if (atomic_read(&journal->j_wcount) > 10) {
3083 sched_count++;
3084 queue_log_writer(sb);
3085 goto relock;
3086 }
3087 }
3088 /*
3089 * don't mess with joining the transaction if all we
3090 * have to do is wait for someone else to do a commit
3091 */
3092 if (atomic_read(&journal->j_jlock)) {
3093 while (journal->j_trans_id == old_trans_id &&
3094 atomic_read(&journal->j_jlock)) {
3095 queue_log_writer(sb);
3096 }
3097 goto relock;
3098 }
3099 retval = journal_join(&myth, sb);
3100 if (retval)
3101 goto out_fail;
3102
3103 /* someone might have ended the transaction while we joined */
3104 if (old_trans_id != journal->j_trans_id) {
3105 retval = do_journal_end(&myth, 0);
3106 } else {
3107 retval = do_journal_end(&myth, COMMIT_NOW);
3108 }
3109
3110 if (retval)
3111 goto out_fail;
3112
3113 PROC_INFO_INC(sb, journal.journal_relock_wcount);
3114 goto relock;
3115 }
3116 /* we are the first writer, set trans_id */
3117 if (journal->j_trans_start_time == 0) {
3118 journal->j_trans_start_time = get_seconds();
3119 }
3120 atomic_inc(&journal->j_wcount);
3121 journal->j_len_alloc += nblocks;
3122 th->t_blocks_logged = 0;
3123 th->t_blocks_allocated = nblocks;
3124 th->t_trans_id = journal->j_trans_id;
3125 unlock_journal(sb);
3126 INIT_LIST_HEAD(&th->t_list);
3127 return 0;
3128
3129 out_fail:
3130 memset(th, 0, sizeof(*th));
3131 /*
3132 * Re-set th->t_super, so we can properly keep track of how many
3133 * persistent transactions there are. We need to do this so if this
3134 * call is part of a failed restart_transaction, we can free it later
3135 */
3136 th->t_super = sb;
3137 return retval;
3138 }
3139
3140 struct reiserfs_transaction_handle *reiserfs_persistent_transaction(struct
3141 super_block
3142 *s,
3143 int nblocks)
3144 {
3145 int ret;
3146 struct reiserfs_transaction_handle *th;
3147
3148 /*
3149 * if we're nesting into an existing transaction. It will be
3150 * persistent on its own
3151 */
3152 if (reiserfs_transaction_running(s)) {
3153 th = current->journal_info;
3154 th->t_refcount++;
3155 BUG_ON(th->t_refcount < 2);
3156
3157 return th;
3158 }
3159 th = kmalloc(sizeof(struct reiserfs_transaction_handle), GFP_NOFS);
3160 if (!th)
3161 return NULL;
3162 ret = journal_begin(th, s, nblocks);
3163 if (ret) {
3164 kfree(th);
3165 return NULL;
3166 }
3167
3168 SB_JOURNAL(s)->j_persistent_trans++;
3169 return th;
3170 }
3171
3172 int reiserfs_end_persistent_transaction(struct reiserfs_transaction_handle *th)
3173 {
3174 struct super_block *s = th->t_super;
3175 int ret = 0;
3176 if (th->t_trans_id)
3177 ret = journal_end(th);
3178 else
3179 ret = -EIO;
3180 if (th->t_refcount == 0) {
3181 SB_JOURNAL(s)->j_persistent_trans--;
3182 kfree(th);
3183 }
3184 return ret;
3185 }
3186
3187 static int journal_join(struct reiserfs_transaction_handle *th,
3188 struct super_block *sb)
3189 {
3190 struct reiserfs_transaction_handle *cur_th = current->journal_info;
3191
3192 /*
3193 * this keeps do_journal_end from NULLing out the
3194 * current->journal_info pointer
3195 */
3196 th->t_handle_save = cur_th;
3197 BUG_ON(cur_th && cur_th->t_refcount > 1);
3198 return do_journal_begin_r(th, sb, 1, JBEGIN_JOIN);
3199 }
3200
3201 int journal_join_abort(struct reiserfs_transaction_handle *th,
3202 struct super_block *sb)
3203 {
3204 struct reiserfs_transaction_handle *cur_th = current->journal_info;
3205
3206 /*
3207 * this keeps do_journal_end from NULLing out the
3208 * current->journal_info pointer
3209 */
3210 th->t_handle_save = cur_th;
3211 BUG_ON(cur_th && cur_th->t_refcount > 1);
3212 return do_journal_begin_r(th, sb, 1, JBEGIN_ABORT);
3213 }
3214
3215 int journal_begin(struct reiserfs_transaction_handle *th,
3216 struct super_block *sb, unsigned long nblocks)
3217 {
3218 struct reiserfs_transaction_handle *cur_th = current->journal_info;
3219 int ret;
3220
3221 th->t_handle_save = NULL;
3222 if (cur_th) {
3223 /* we are nesting into the current transaction */
3224 if (cur_th->t_super == sb) {
3225 BUG_ON(!cur_th->t_refcount);
3226 cur_th->t_refcount++;
3227 memcpy(th, cur_th, sizeof(*th));
3228 if (th->t_refcount <= 1)
3229 reiserfs_warning(sb, "reiserfs-2005",
3230 "BAD: refcount <= 1, but "
3231 "journal_info != 0");
3232 return 0;
3233 } else {
3234 /*
3235 * we've ended up with a handle from a different
3236 * filesystem. save it and restore on journal_end.
3237 * This should never really happen...
3238 */
3239 reiserfs_warning(sb, "clm-2100",
3240 "nesting info a different FS");
3241 th->t_handle_save = current->journal_info;
3242 current->journal_info = th;
3243 }
3244 } else {
3245 current->journal_info = th;
3246 }
3247 ret = do_journal_begin_r(th, sb, nblocks, JBEGIN_REG);
3248 BUG_ON(current->journal_info != th);
3249
3250 /*
3251 * I guess this boils down to being the reciprocal of clm-2100 above.
3252 * If do_journal_begin_r fails, we need to put it back, since
3253 * journal_end won't be called to do it. */
3254 if (ret)
3255 current->journal_info = th->t_handle_save;
3256 else
3257 BUG_ON(!th->t_refcount);
3258
3259 return ret;
3260 }
3261
3262 /*
3263 * puts bh into the current transaction. If it was already there, reorders
3264 * removes the old pointers from the hash, and puts new ones in (to make
3265 * sure replay happen in the right order).
3266 *
3267 * if it was dirty, cleans and files onto the clean list. I can't let it
3268 * be dirty again until the transaction is committed.
3269 *
3270 * if j_len, is bigger than j_len_alloc, it pushes j_len_alloc to 10 + j_len.
3271 */
3272 int journal_mark_dirty(struct reiserfs_transaction_handle *th,
3273 struct buffer_head *bh)
3274 {
3275 struct super_block *sb = th->t_super;
3276 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3277 struct reiserfs_journal_cnode *cn = NULL;
3278 int count_already_incd = 0;
3279 int prepared = 0;
3280 BUG_ON(!th->t_trans_id);
3281
3282 PROC_INFO_INC(sb, journal.mark_dirty);
3283 if (th->t_trans_id != journal->j_trans_id) {
3284 reiserfs_panic(th->t_super, "journal-1577",
3285 "handle trans id %ld != current trans id %ld",
3286 th->t_trans_id, journal->j_trans_id);
3287 }
3288
3289 prepared = test_clear_buffer_journal_prepared(bh);
3290 clear_buffer_journal_restore_dirty(bh);
3291 /* already in this transaction, we are done */
3292 if (buffer_journaled(bh)) {
3293 PROC_INFO_INC(sb, journal.mark_dirty_already);
3294 return 0;
3295 }
3296
3297 /*
3298 * this must be turned into a panic instead of a warning. We can't
3299 * allow a dirty or journal_dirty or locked buffer to be logged, as
3300 * some changes could get to disk too early. NOT GOOD.
3301 */
3302 if (!prepared || buffer_dirty(bh)) {
3303 reiserfs_warning(sb, "journal-1777",
3304 "buffer %llu bad state "
3305 "%cPREPARED %cLOCKED %cDIRTY %cJDIRTY_WAIT",
3306 (unsigned long long)bh->b_blocknr,
3307 prepared ? ' ' : '!',
3308 buffer_locked(bh) ? ' ' : '!',
3309 buffer_dirty(bh) ? ' ' : '!',
3310 buffer_journal_dirty(bh) ? ' ' : '!');
3311 }
3312
3313 if (atomic_read(&journal->j_wcount) <= 0) {
3314 reiserfs_warning(sb, "journal-1409",
3315 "returning because j_wcount was %d",
3316 atomic_read(&journal->j_wcount));
3317 return 1;
3318 }
3319 /*
3320 * this error means I've screwed up, and we've overflowed
3321 * the transaction. Nothing can be done here, except make the
3322 * FS readonly or panic.
3323 */
3324 if (journal->j_len >= journal->j_trans_max) {
3325 reiserfs_panic(th->t_super, "journal-1413",
3326 "j_len (%lu) is too big",
3327 journal->j_len);
3328 }
3329
3330 if (buffer_journal_dirty(bh)) {
3331 count_already_incd = 1;
3332 PROC_INFO_INC(sb, journal.mark_dirty_notjournal);
3333 clear_buffer_journal_dirty(bh);
3334 }
3335
3336 if (journal->j_len > journal->j_len_alloc) {
3337 journal->j_len_alloc = journal->j_len + JOURNAL_PER_BALANCE_CNT;
3338 }
3339
3340 set_buffer_journaled(bh);
3341
3342 /* now put this guy on the end */
3343 if (!cn) {
3344 cn = get_cnode(sb);
3345 if (!cn) {
3346 reiserfs_panic(sb, "journal-4", "get_cnode failed!");
3347 }
3348
3349 if (th->t_blocks_logged == th->t_blocks_allocated) {
3350 th->t_blocks_allocated += JOURNAL_PER_BALANCE_CNT;
3351 journal->j_len_alloc += JOURNAL_PER_BALANCE_CNT;
3352 }
3353 th->t_blocks_logged++;
3354 journal->j_len++;
3355
3356 cn->bh = bh;
3357 cn->blocknr = bh->b_blocknr;
3358 cn->sb = sb;
3359 cn->jlist = NULL;
3360 insert_journal_hash(journal->j_hash_table, cn);
3361 if (!count_already_incd) {
3362 get_bh(bh);
3363 }
3364 }
3365 cn->next = NULL;
3366 cn->prev = journal->j_last;
3367 cn->bh = bh;
3368 if (journal->j_last) {
3369 journal->j_last->next = cn;
3370 journal->j_last = cn;
3371 } else {
3372 journal->j_first = cn;
3373 journal->j_last = cn;
3374 }
3375 reiserfs_schedule_old_flush(sb);
3376 return 0;
3377 }
3378
3379 int journal_end(struct reiserfs_transaction_handle *th)
3380 {
3381 struct super_block *sb = th->t_super;
3382 if (!current->journal_info && th->t_refcount > 1)
3383 reiserfs_warning(sb, "REISER-NESTING",
3384 "th NULL, refcount %d", th->t_refcount);
3385
3386 if (!th->t_trans_id) {
3387 WARN_ON(1);
3388 return -EIO;
3389 }
3390
3391 th->t_refcount--;
3392 if (th->t_refcount > 0) {
3393 struct reiserfs_transaction_handle *cur_th =
3394 current->journal_info;
3395
3396 /*
3397 * we aren't allowed to close a nested transaction on a
3398 * different filesystem from the one in the task struct
3399 */
3400 BUG_ON(cur_th->t_super != th->t_super);
3401
3402 if (th != cur_th) {
3403 memcpy(current->journal_info, th, sizeof(*th));
3404 th->t_trans_id = 0;
3405 }
3406 return 0;
3407 } else {
3408 return do_journal_end(th, 0);
3409 }
3410 }
3411
3412 /*
3413 * removes from the current transaction, relsing and descrementing any counters.
3414 * also files the removed buffer directly onto the clean list
3415 *
3416 * called by journal_mark_freed when a block has been deleted
3417 *
3418 * returns 1 if it cleaned and relsed the buffer. 0 otherwise
3419 */
3420 static int remove_from_transaction(struct super_block *sb,
3421 b_blocknr_t blocknr, int already_cleaned)
3422 {
3423 struct buffer_head *bh;
3424 struct reiserfs_journal_cnode *cn;
3425 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3426 int ret = 0;
3427
3428 cn = get_journal_hash_dev(sb, journal->j_hash_table, blocknr);
3429 if (!cn || !cn->bh) {
3430 return ret;
3431 }
3432 bh = cn->bh;
3433 if (cn->prev) {
3434 cn->prev->next = cn->next;
3435 }
3436 if (cn->next) {
3437 cn->next->prev = cn->prev;
3438 }
3439 if (cn == journal->j_first) {
3440 journal->j_first = cn->next;
3441 }
3442 if (cn == journal->j_last) {
3443 journal->j_last = cn->prev;
3444 }
3445 if (bh)
3446 remove_journal_hash(sb, journal->j_hash_table, NULL,
3447 bh->b_blocknr, 0);
3448 clear_buffer_journaled(bh); /* don't log this one */
3449
3450 if (!already_cleaned) {
3451 clear_buffer_journal_dirty(bh);
3452 clear_buffer_dirty(bh);
3453 clear_buffer_journal_test(bh);
3454 put_bh(bh);
3455 if (atomic_read(&bh->b_count) < 0) {
3456 reiserfs_warning(sb, "journal-1752",
3457 "b_count < 0");
3458 }
3459 ret = 1;
3460 }
3461 journal->j_len--;
3462 journal->j_len_alloc--;
3463 free_cnode(sb, cn);
3464 return ret;
3465 }
3466
3467 /*
3468 * for any cnode in a journal list, it can only be dirtied of all the
3469 * transactions that include it are committed to disk.
3470 * this checks through each transaction, and returns 1 if you are allowed
3471 * to dirty, and 0 if you aren't
3472 *
3473 * it is called by dirty_journal_list, which is called after
3474 * flush_commit_list has gotten all the log blocks for a given
3475 * transaction on disk
3476 *
3477 */
3478 static int can_dirty(struct reiserfs_journal_cnode *cn)
3479 {
3480 struct super_block *sb = cn->sb;
3481 b_blocknr_t blocknr = cn->blocknr;
3482 struct reiserfs_journal_cnode *cur = cn->hprev;
3483 int can_dirty = 1;
3484
3485 /*
3486 * first test hprev. These are all newer than cn, so any node here
3487 * with the same block number and dev means this node can't be sent
3488 * to disk right now.
3489 */
3490 while (cur && can_dirty) {
3491 if (cur->jlist && cur->bh && cur->blocknr && cur->sb == sb &&
3492 cur->blocknr == blocknr) {
3493 can_dirty = 0;
3494 }
3495 cur = cur->hprev;
3496 }
3497 /*
3498 * then test hnext. These are all older than cn. As long as they
3499 * are committed to the log, it is safe to write cn to disk
3500 */
3501 cur = cn->hnext;
3502 while (cur && can_dirty) {
3503 if (cur->jlist && cur->jlist->j_len > 0 &&
3504 atomic_read(&cur->jlist->j_commit_left) > 0 && cur->bh &&
3505 cur->blocknr && cur->sb == sb && cur->blocknr == blocknr) {
3506 can_dirty = 0;
3507 }
3508 cur = cur->hnext;
3509 }
3510 return can_dirty;
3511 }
3512
3513 /*
3514 * syncs the commit blocks, but does not force the real buffers to disk
3515 * will wait until the current transaction is done/committed before returning
3516 */
3517 int journal_end_sync(struct reiserfs_transaction_handle *th)
3518 {
3519 struct super_block *sb = th->t_super;
3520 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3521
3522 BUG_ON(!th->t_trans_id);
3523 /* you can sync while nested, very, very bad */
3524 BUG_ON(th->t_refcount > 1);
3525 if (journal->j_len == 0) {
3526 reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
3527 1);
3528 journal_mark_dirty(th, SB_BUFFER_WITH_SB(sb));
3529 }
3530 return do_journal_end(th, COMMIT_NOW | WAIT);
3531 }
3532
3533 /* writeback the pending async commits to disk */
3534 static void flush_async_commits(struct work_struct *work)
3535 {
3536 struct reiserfs_journal *journal =
3537 container_of(work, struct reiserfs_journal, j_work.work);
3538 struct super_block *sb = journal->j_work_sb;
3539 struct reiserfs_journal_list *jl;
3540 struct list_head *entry;
3541
3542 reiserfs_write_lock(sb);
3543 if (!list_empty(&journal->j_journal_list)) {
3544 /* last entry is the youngest, commit it and you get everything */
3545 entry = journal->j_journal_list.prev;
3546 jl = JOURNAL_LIST_ENTRY(entry);
3547 flush_commit_list(sb, jl, 1);
3548 }
3549 reiserfs_write_unlock(sb);
3550 }
3551
3552 /*
3553 * flushes any old transactions to disk
3554 * ends the current transaction if it is too old
3555 */
3556 void reiserfs_flush_old_commits(struct super_block *sb)
3557 {
3558 time_t now;
3559 struct reiserfs_transaction_handle th;
3560 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3561
3562 now = get_seconds();
3563 /*
3564 * safety check so we don't flush while we are replaying the log during
3565 * mount
3566 */
3567 if (list_empty(&journal->j_journal_list))
3568 return;
3569
3570 /*
3571 * check the current transaction. If there are no writers, and it is
3572 * too old, finish it, and force the commit blocks to disk
3573 */
3574 if (atomic_read(&journal->j_wcount) <= 0 &&
3575 journal->j_trans_start_time > 0 &&
3576 journal->j_len > 0 &&
3577 (now - journal->j_trans_start_time) > journal->j_max_trans_age) {
3578 if (!journal_join(&th, sb)) {
3579 reiserfs_prepare_for_journal(sb,
3580 SB_BUFFER_WITH_SB(sb),
3581 1);
3582 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(sb));
3583
3584 /*
3585 * we're only being called from kreiserfsd, it makes
3586 * no sense to do an async commit so that kreiserfsd
3587 * can do it later
3588 */
3589 do_journal_end(&th, COMMIT_NOW | WAIT);
3590 }
3591 }
3592 }
3593
3594 /*
3595 * returns 0 if do_journal_end should return right away, returns 1 if
3596 * do_journal_end should finish the commit
3597 *
3598 * if the current transaction is too old, but still has writers, this will
3599 * wait on j_join_wait until all the writers are done. By the time it
3600 * wakes up, the transaction it was called has already ended, so it just
3601 * flushes the commit list and returns 0.
3602 *
3603 * Won't batch when flush or commit_now is set. Also won't batch when
3604 * others are waiting on j_join_wait.
3605 *
3606 * Note, we can't allow the journal_end to proceed while there are still
3607 * writers in the log.
3608 */
3609 static int check_journal_end(struct reiserfs_transaction_handle *th, int flags)
3610 {
3611
3612 time_t now;
3613 int flush = flags & FLUSH_ALL;
3614 int commit_now = flags & COMMIT_NOW;
3615 int wait_on_commit = flags & WAIT;
3616 struct reiserfs_journal_list *jl;
3617 struct super_block *sb = th->t_super;
3618 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3619
3620 BUG_ON(!th->t_trans_id);
3621
3622 if (th->t_trans_id != journal->j_trans_id) {
3623 reiserfs_panic(th->t_super, "journal-1577",
3624 "handle trans id %ld != current trans id %ld",
3625 th->t_trans_id, journal->j_trans_id);
3626 }
3627
3628 journal->j_len_alloc -= (th->t_blocks_allocated - th->t_blocks_logged);
3629 /* <= 0 is allowed. unmounting might not call begin */
3630 if (atomic_read(&journal->j_wcount) > 0)
3631 atomic_dec(&journal->j_wcount);
3632
3633 /*
3634 * BUG, deal with case where j_len is 0, but people previously
3635 * freed blocks need to be released will be dealt with by next
3636 * transaction that actually writes something, but should be taken
3637 * care of in this trans
3638 */
3639 BUG_ON(journal->j_len == 0);
3640
3641 /*
3642 * if wcount > 0, and we are called to with flush or commit_now,
3643 * we wait on j_join_wait. We will wake up when the last writer has
3644 * finished the transaction, and started it on its way to the disk.
3645 * Then, we flush the commit or journal list, and just return 0
3646 * because the rest of journal end was already done for this
3647 * transaction.
3648 */
3649 if (atomic_read(&journal->j_wcount) > 0) {
3650 if (flush || commit_now) {
3651 unsigned trans_id;
3652
3653 jl = journal->j_current_jl;
3654 trans_id = jl->j_trans_id;
3655 if (wait_on_commit)
3656 jl->j_state |= LIST_COMMIT_PENDING;
3657 atomic_set(&journal->j_jlock, 1);
3658 if (flush) {
3659 journal->j_next_full_flush = 1;
3660 }
3661 unlock_journal(sb);
3662
3663 /*
3664 * sleep while the current transaction is
3665 * still j_jlocked
3666 */
3667 while (journal->j_trans_id == trans_id) {
3668 if (atomic_read(&journal->j_jlock)) {
3669 queue_log_writer(sb);
3670 } else {
3671 lock_journal(sb);
3672 if (journal->j_trans_id == trans_id) {
3673 atomic_set(&journal->j_jlock,
3674 1);
3675 }
3676 unlock_journal(sb);
3677 }
3678 }
3679 BUG_ON(journal->j_trans_id == trans_id);
3680
3681 if (commit_now
3682 && journal_list_still_alive(sb, trans_id)
3683 && wait_on_commit) {
3684 flush_commit_list(sb, jl, 1);
3685 }
3686 return 0;
3687 }
3688 unlock_journal(sb);
3689 return 0;
3690 }
3691
3692 /* deal with old transactions where we are the last writers */
3693 now = get_seconds();
3694 if ((now - journal->j_trans_start_time) > journal->j_max_trans_age) {
3695 commit_now = 1;
3696 journal->j_next_async_flush = 1;
3697 }
3698 /* don't batch when someone is waiting on j_join_wait */
3699 /* don't batch when syncing the commit or flushing the whole trans */
3700 if (!(journal->j_must_wait > 0) && !(atomic_read(&journal->j_jlock))
3701 && !flush && !commit_now && (journal->j_len < journal->j_max_batch)
3702 && journal->j_len_alloc < journal->j_max_batch
3703 && journal->j_cnode_free > (journal->j_trans_max * 3)) {
3704 journal->j_bcount++;
3705 unlock_journal(sb);
3706 return 0;
3707 }
3708
3709 if (journal->j_start > SB_ONDISK_JOURNAL_SIZE(sb)) {
3710 reiserfs_panic(sb, "journal-003",
3711 "j_start (%ld) is too high",
3712 journal->j_start);
3713 }
3714 return 1;
3715 }
3716
3717 /*
3718 * Does all the work that makes deleting blocks safe.
3719 * when deleting a block mark BH_JNew, just remove it from the current
3720 * transaction, clean it's buffer_head and move on.
3721 *
3722 * otherwise:
3723 * set a bit for the block in the journal bitmap. That will prevent it from
3724 * being allocated for unformatted nodes before this transaction has finished.
3725 *
3726 * mark any cnodes for this block as BLOCK_FREED, and clear their bh pointers.
3727 * That will prevent any old transactions with this block from trying to flush
3728 * to the real location. Since we aren't removing the cnode from the
3729 * journal_list_hash, *the block can't be reallocated yet.
3730 *
3731 * Then remove it from the current transaction, decrementing any counters and
3732 * filing it on the clean list.
3733 */
3734 int journal_mark_freed(struct reiserfs_transaction_handle *th,
3735 struct super_block *sb, b_blocknr_t blocknr)
3736 {
3737 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3738 struct reiserfs_journal_cnode *cn = NULL;
3739 struct buffer_head *bh = NULL;
3740 struct reiserfs_list_bitmap *jb = NULL;
3741 int cleaned = 0;
3742 BUG_ON(!th->t_trans_id);
3743
3744 cn = get_journal_hash_dev(sb, journal->j_hash_table, blocknr);
3745 if (cn && cn->bh) {
3746 bh = cn->bh;
3747 get_bh(bh);
3748 }
3749 /* if it is journal new, we just remove it from this transaction */
3750 if (bh && buffer_journal_new(bh)) {
3751 clear_buffer_journal_new(bh);
3752 clear_prepared_bits(bh);
3753 reiserfs_clean_and_file_buffer(bh);
3754 cleaned = remove_from_transaction(sb, blocknr, cleaned);
3755 } else {
3756 /*
3757 * set the bit for this block in the journal bitmap
3758 * for this transaction
3759 */
3760 jb = journal->j_current_jl->j_list_bitmap;
3761 if (!jb) {
3762 reiserfs_panic(sb, "journal-1702",
3763 "journal_list_bitmap is NULL");
3764 }
3765 set_bit_in_list_bitmap(sb, blocknr, jb);
3766
3767 /* Note, the entire while loop is not allowed to schedule. */
3768
3769 if (bh) {
3770 clear_prepared_bits(bh);
3771 reiserfs_clean_and_file_buffer(bh);
3772 }
3773 cleaned = remove_from_transaction(sb, blocknr, cleaned);
3774
3775 /*
3776 * find all older transactions with this block,
3777 * make sure they don't try to write it out
3778 */
3779 cn = get_journal_hash_dev(sb, journal->j_list_hash_table,
3780 blocknr);
3781 while (cn) {
3782 if (sb == cn->sb && blocknr == cn->blocknr) {
3783 set_bit(BLOCK_FREED, &cn->state);
3784 if (cn->bh) {
3785 /*
3786 * remove_from_transaction will brelse
3787 * the buffer if it was in the current
3788 * trans
3789 */
3790 if (!cleaned) {
3791 clear_buffer_journal_dirty(cn->
3792 bh);
3793 clear_buffer_dirty(cn->bh);
3794 clear_buffer_journal_test(cn->
3795 bh);
3796 cleaned = 1;
3797 put_bh(cn->bh);
3798 if (atomic_read
3799 (&cn->bh->b_count) < 0) {
3800 reiserfs_warning(sb,
3801 "journal-2138",
3802 "cn->bh->b_count < 0");
3803 }
3804 }
3805 /*
3806 * since we are clearing the bh,
3807 * we MUST dec nonzerolen
3808 */
3809 if (cn->jlist) {
3810 atomic_dec(&cn->jlist->
3811 j_nonzerolen);
3812 }
3813 cn->bh = NULL;
3814 }
3815 }
3816 cn = cn->hnext;
3817 }
3818 }
3819
3820 if (bh)
3821 release_buffer_page(bh); /* get_hash grabs the buffer */
3822 return 0;
3823 }
3824
3825 void reiserfs_update_inode_transaction(struct inode *inode)
3826 {
3827 struct reiserfs_journal *journal = SB_JOURNAL(inode->i_sb);
3828 REISERFS_I(inode)->i_jl = journal->j_current_jl;
3829 REISERFS_I(inode)->i_trans_id = journal->j_trans_id;
3830 }
3831
3832 /*
3833 * returns -1 on error, 0 if no commits/barriers were done and 1
3834 * if a transaction was actually committed and the barrier was done
3835 */
3836 static int __commit_trans_jl(struct inode *inode, unsigned long id,
3837 struct reiserfs_journal_list *jl)
3838 {
3839 struct reiserfs_transaction_handle th;
3840 struct super_block *sb = inode->i_sb;
3841 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3842 int ret = 0;
3843
3844 /*
3845 * is it from the current transaction,
3846 * or from an unknown transaction?
3847 */
3848 if (id == journal->j_trans_id) {
3849 jl = journal->j_current_jl;
3850 /*
3851 * try to let other writers come in and
3852 * grow this transaction
3853 */
3854 let_transaction_grow(sb, id);
3855 if (journal->j_trans_id != id) {
3856 goto flush_commit_only;
3857 }
3858
3859 ret = journal_begin(&th, sb, 1);
3860 if (ret)
3861 return ret;
3862
3863 /* someone might have ended this transaction while we joined */
3864 if (journal->j_trans_id != id) {
3865 reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
3866 1);
3867 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(sb));
3868 ret = journal_end(&th);
3869 goto flush_commit_only;
3870 }
3871
3872 ret = journal_end_sync(&th);
3873 if (!ret)
3874 ret = 1;
3875
3876 } else {
3877 /*
3878 * this gets tricky, we have to make sure the journal list in
3879 * the inode still exists. We know the list is still around
3880 * if we've got a larger transaction id than the oldest list
3881 */
3882 flush_commit_only:
3883 if (journal_list_still_alive(inode->i_sb, id)) {
3884 /*
3885 * we only set ret to 1 when we know for sure
3886 * the barrier hasn't been started yet on the commit
3887 * block.
3888 */
3889 if (atomic_read(&jl->j_commit_left) > 1)
3890 ret = 1;
3891 flush_commit_list(sb, jl, 1);
3892 if (journal->j_errno)
3893 ret = journal->j_errno;
3894 }
3895 }
3896 /* otherwise the list is gone, and long since committed */
3897 return ret;
3898 }
3899
3900 int reiserfs_commit_for_inode(struct inode *inode)
3901 {
3902 unsigned int id = REISERFS_I(inode)->i_trans_id;
3903 struct reiserfs_journal_list *jl = REISERFS_I(inode)->i_jl;
3904
3905 /*
3906 * for the whole inode, assume unset id means it was
3907 * changed in the current transaction. More conservative
3908 */
3909 if (!id || !jl) {
3910 reiserfs_update_inode_transaction(inode);
3911 id = REISERFS_I(inode)->i_trans_id;
3912 /* jl will be updated in __commit_trans_jl */
3913 }
3914
3915 return __commit_trans_jl(inode, id, jl);
3916 }
3917
3918 void reiserfs_restore_prepared_buffer(struct super_block *sb,
3919 struct buffer_head *bh)
3920 {
3921 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3922 PROC_INFO_INC(sb, journal.restore_prepared);
3923 if (!bh) {
3924 return;
3925 }
3926 if (test_clear_buffer_journal_restore_dirty(bh) &&
3927 buffer_journal_dirty(bh)) {
3928 struct reiserfs_journal_cnode *cn;
3929 reiserfs_write_lock(sb);
3930 cn = get_journal_hash_dev(sb,
3931 journal->j_list_hash_table,
3932 bh->b_blocknr);
3933 if (cn && can_dirty(cn)) {
3934 set_buffer_journal_test(bh);
3935 mark_buffer_dirty(bh);
3936 }
3937 reiserfs_write_unlock(sb);
3938 }
3939 clear_buffer_journal_prepared(bh);
3940 }
3941
3942 extern struct tree_balance *cur_tb;
3943 /*
3944 * before we can change a metadata block, we have to make sure it won't
3945 * be written to disk while we are altering it. So, we must:
3946 * clean it
3947 * wait on it.
3948 */
3949 int reiserfs_prepare_for_journal(struct super_block *sb,
3950 struct buffer_head *bh, int wait)
3951 {
3952 PROC_INFO_INC(sb, journal.prepare);
3953
3954 if (!trylock_buffer(bh)) {
3955 if (!wait)
3956 return 0;
3957 lock_buffer(bh);
3958 }
3959 set_buffer_journal_prepared(bh);
3960 if (test_clear_buffer_dirty(bh) && buffer_journal_dirty(bh)) {
3961 clear_buffer_journal_test(bh);
3962 set_buffer_journal_restore_dirty(bh);
3963 }
3964 unlock_buffer(bh);
3965 return 1;
3966 }
3967
3968 /*
3969 * long and ugly. If flush, will not return until all commit
3970 * blocks and all real buffers in the trans are on disk.
3971 * If no_async, won't return until all commit blocks are on disk.
3972 *
3973 * keep reading, there are comments as you go along
3974 *
3975 * If the journal is aborted, we just clean up. Things like flushing
3976 * journal lists, etc just won't happen.
3977 */
3978 static int do_journal_end(struct reiserfs_transaction_handle *th, int flags)
3979 {
3980 struct super_block *sb = th->t_super;
3981 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3982 struct reiserfs_journal_cnode *cn, *next, *jl_cn;
3983 struct reiserfs_journal_cnode *last_cn = NULL;
3984 struct reiserfs_journal_desc *desc;
3985 struct reiserfs_journal_commit *commit;
3986 struct buffer_head *c_bh; /* commit bh */
3987 struct buffer_head *d_bh; /* desc bh */
3988 int cur_write_start = 0; /* start index of current log write */
3989 int old_start;
3990 int i;
3991 int flush;
3992 int wait_on_commit;
3993 struct reiserfs_journal_list *jl, *temp_jl;
3994 struct list_head *entry, *safe;
3995 unsigned long jindex;
3996 unsigned int commit_trans_id;
3997 int trans_half;
3998 int depth;
3999
4000 BUG_ON(th->t_refcount > 1);
4001 BUG_ON(!th->t_trans_id);
4002 BUG_ON(!th->t_super);
4003
4004 /*
4005 * protect flush_older_commits from doing mistakes if the
4006 * transaction ID counter gets overflowed.
4007 */
4008 if (th->t_trans_id == ~0U)
4009 flags |= FLUSH_ALL | COMMIT_NOW | WAIT;
4010 flush = flags & FLUSH_ALL;
4011 wait_on_commit = flags & WAIT;
4012
4013 current->journal_info = th->t_handle_save;
4014 reiserfs_check_lock_depth(sb, "journal end");
4015 if (journal->j_len == 0) {
4016 reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
4017 1);
4018 journal_mark_dirty(th, SB_BUFFER_WITH_SB(sb));
4019 }
4020
4021 lock_journal(sb);
4022 if (journal->j_next_full_flush) {
4023 flags |= FLUSH_ALL;
4024 flush = 1;
4025 }
4026 if (journal->j_next_async_flush) {
4027 flags |= COMMIT_NOW | WAIT;
4028 wait_on_commit = 1;
4029 }
4030
4031 /*
4032 * check_journal_end locks the journal, and unlocks if it does
4033 * not return 1 it tells us if we should continue with the
4034 * journal_end, or just return
4035 */
4036 if (!check_journal_end(th, flags)) {
4037 reiserfs_schedule_old_flush(sb);
4038 wake_queued_writers(sb);
4039 reiserfs_async_progress_wait(sb);
4040 goto out;
4041 }
4042
4043 /* check_journal_end might set these, check again */
4044 if (journal->j_next_full_flush) {
4045 flush = 1;
4046 }
4047
4048 /*
4049 * j must wait means we have to flush the log blocks, and the
4050 * real blocks for this transaction
4051 */
4052 if (journal->j_must_wait > 0) {
4053 flush = 1;
4054 }
4055 #ifdef REISERFS_PREALLOCATE
4056 /*
4057 * quota ops might need to nest, setup the journal_info pointer
4058 * for them and raise the refcount so that it is > 0.
4059 */
4060 current->journal_info = th;
4061 th->t_refcount++;
4062
4063 /* it should not involve new blocks into the transaction */
4064 reiserfs_discard_all_prealloc(th);
4065
4066 th->t_refcount--;
4067 current->journal_info = th->t_handle_save;
4068 #endif
4069
4070 /* setup description block */
4071 d_bh =
4072 journal_getblk(sb,
4073 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
4074 journal->j_start);
4075 set_buffer_uptodate(d_bh);
4076 desc = (struct reiserfs_journal_desc *)(d_bh)->b_data;
4077 memset(d_bh->b_data, 0, d_bh->b_size);
4078 memcpy(get_journal_desc_magic(d_bh), JOURNAL_DESC_MAGIC, 8);
4079 set_desc_trans_id(desc, journal->j_trans_id);
4080
4081 /*
4082 * setup commit block. Don't write (keep it clean too) this one
4083 * until after everyone else is written
4084 */
4085 c_bh = journal_getblk(sb, SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
4086 ((journal->j_start + journal->j_len +
4087 1) % SB_ONDISK_JOURNAL_SIZE(sb)));
4088 commit = (struct reiserfs_journal_commit *)c_bh->b_data;
4089 memset(c_bh->b_data, 0, c_bh->b_size);
4090 set_commit_trans_id(commit, journal->j_trans_id);
4091 set_buffer_uptodate(c_bh);
4092
4093 /* init this journal list */
4094 jl = journal->j_current_jl;
4095
4096 /*
4097 * we lock the commit before doing anything because
4098 * we want to make sure nobody tries to run flush_commit_list until
4099 * the new transaction is fully setup, and we've already flushed the
4100 * ordered bh list
4101 */
4102 reiserfs_mutex_lock_safe(&jl->j_commit_mutex, sb);
4103
4104 /* save the transaction id in case we need to commit it later */
4105 commit_trans_id = jl->j_trans_id;
4106
4107 atomic_set(&jl->j_older_commits_done, 0);
4108 jl->j_trans_id = journal->j_trans_id;
4109 jl->j_timestamp = journal->j_trans_start_time;
4110 jl->j_commit_bh = c_bh;
4111 jl->j_start = journal->j_start;
4112 jl->j_len = journal->j_len;
4113 atomic_set(&jl->j_nonzerolen, journal->j_len);
4114 atomic_set(&jl->j_commit_left, journal->j_len + 2);
4115 jl->j_realblock = NULL;
4116
4117 /*
4118 * The ENTIRE FOR LOOP MUST not cause schedule to occur.
4119 * for each real block, add it to the journal list hash,
4120 * copy into real block index array in the commit or desc block
4121 */
4122 trans_half = journal_trans_half(sb->s_blocksize);
4123 for (i = 0, cn = journal->j_first; cn; cn = cn->next, i++) {
4124 if (buffer_journaled(cn->bh)) {
4125 jl_cn = get_cnode(sb);
4126 if (!jl_cn) {
4127 reiserfs_panic(sb, "journal-1676",
4128 "get_cnode returned NULL");
4129 }
4130 if (i == 0) {
4131 jl->j_realblock = jl_cn;
4132 }
4133 jl_cn->prev = last_cn;
4134 jl_cn->next = NULL;
4135 if (last_cn) {
4136 last_cn->next = jl_cn;
4137 }
4138 last_cn = jl_cn;
4139 /*
4140 * make sure the block we are trying to log
4141 * is not a block of journal or reserved area
4142 */
4143 if (is_block_in_log_or_reserved_area
4144 (sb, cn->bh->b_blocknr)) {
4145 reiserfs_panic(sb, "journal-2332",
4146 "Trying to log block %lu, "
4147 "which is a log block",
4148 cn->bh->b_blocknr);
4149 }
4150 jl_cn->blocknr = cn->bh->b_blocknr;
4151 jl_cn->state = 0;
4152 jl_cn->sb = sb;
4153 jl_cn->bh = cn->bh;
4154 jl_cn->jlist = jl;
4155 insert_journal_hash(journal->j_list_hash_table, jl_cn);
4156 if (i < trans_half) {
4157 desc->j_realblock[i] =
4158 cpu_to_le32(cn->bh->b_blocknr);
4159 } else {
4160 commit->j_realblock[i - trans_half] =
4161 cpu_to_le32(cn->bh->b_blocknr);
4162 }
4163 } else {
4164 i--;
4165 }
4166 }
4167 set_desc_trans_len(desc, journal->j_len);
4168 set_desc_mount_id(desc, journal->j_mount_id);
4169 set_desc_trans_id(desc, journal->j_trans_id);
4170 set_commit_trans_len(commit, journal->j_len);
4171
4172 /*
4173 * special check in case all buffers in the journal
4174 * were marked for not logging
4175 */
4176 BUG_ON(journal->j_len == 0);
4177
4178 /*
4179 * we're about to dirty all the log blocks, mark the description block
4180 * dirty now too. Don't mark the commit block dirty until all the
4181 * others are on disk
4182 */
4183 mark_buffer_dirty(d_bh);
4184
4185 /*
4186 * first data block is j_start + 1, so add one to
4187 * cur_write_start wherever you use it
4188 */
4189 cur_write_start = journal->j_start;
4190 cn = journal->j_first;
4191 jindex = 1; /* start at one so we don't get the desc again */
4192 while (cn) {
4193 clear_buffer_journal_new(cn->bh);
4194 /* copy all the real blocks into log area. dirty log blocks */
4195 if (buffer_journaled(cn->bh)) {
4196 struct buffer_head *tmp_bh;
4197 char *addr;
4198 struct page *page;
4199 tmp_bh =
4200 journal_getblk(sb,
4201 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
4202 ((cur_write_start +
4203 jindex) %
4204 SB_ONDISK_JOURNAL_SIZE(sb)));
4205 set_buffer_uptodate(tmp_bh);
4206 page = cn->bh->b_page;
4207 addr = kmap(page);
4208 memcpy(tmp_bh->b_data,
4209 addr + offset_in_page(cn->bh->b_data),
4210 cn->bh->b_size);
4211 kunmap(page);
4212 mark_buffer_dirty(tmp_bh);
4213 jindex++;
4214 set_buffer_journal_dirty(cn->bh);
4215 clear_buffer_journaled(cn->bh);
4216 } else {
4217 /*
4218 * JDirty cleared sometime during transaction.
4219 * don't log this one
4220 */
4221 reiserfs_warning(sb, "journal-2048",
4222 "BAD, buffer in journal hash, "
4223 "but not JDirty!");
4224 brelse(cn->bh);
4225 }
4226 next = cn->next;
4227 free_cnode(sb, cn);
4228 cn = next;
4229 reiserfs_cond_resched(sb);
4230 }
4231
4232 /*
4233 * we are done with both the c_bh and d_bh, but
4234 * c_bh must be written after all other commit blocks,
4235 * so we dirty/relse c_bh in flush_commit_list, with commit_left <= 1.
4236 */
4237
4238 journal->j_current_jl = alloc_journal_list(sb);
4239
4240 /* now it is safe to insert this transaction on the main list */
4241 list_add_tail(&jl->j_list, &journal->j_journal_list);
4242 list_add_tail(&jl->j_working_list, &journal->j_working_list);
4243 journal->j_num_work_lists++;
4244
4245 /* reset journal values for the next transaction */
4246 old_start = journal->j_start;
4247 journal->j_start =
4248 (journal->j_start + journal->j_len +
4249 2) % SB_ONDISK_JOURNAL_SIZE(sb);
4250 atomic_set(&journal->j_wcount, 0);
4251 journal->j_bcount = 0;
4252 journal->j_last = NULL;
4253 journal->j_first = NULL;
4254 journal->j_len = 0;
4255 journal->j_trans_start_time = 0;
4256 /* check for trans_id overflow */
4257 if (++journal->j_trans_id == 0)
4258 journal->j_trans_id = 10;
4259 journal->j_current_jl->j_trans_id = journal->j_trans_id;
4260 journal->j_must_wait = 0;
4261 journal->j_len_alloc = 0;
4262 journal->j_next_full_flush = 0;
4263 journal->j_next_async_flush = 0;
4264 init_journal_hash(sb);
4265
4266 /*
4267 * make sure reiserfs_add_jh sees the new current_jl before we
4268 * write out the tails
4269 */
4270 smp_mb();
4271
4272 /*
4273 * tail conversion targets have to hit the disk before we end the
4274 * transaction. Otherwise a later transaction might repack the tail
4275 * before this transaction commits, leaving the data block unflushed
4276 * and clean, if we crash before the later transaction commits, the
4277 * data block is lost.
4278 */
4279 if (!list_empty(&jl->j_tail_bh_list)) {
4280 depth = reiserfs_write_unlock_nested(sb);
4281 write_ordered_buffers(&journal->j_dirty_buffers_lock,
4282 journal, jl, &jl->j_tail_bh_list);
4283 reiserfs_write_lock_nested(sb, depth);
4284 }
4285 BUG_ON(!list_empty(&jl->j_tail_bh_list));
4286 mutex_unlock(&jl->j_commit_mutex);
4287
4288 /*
4289 * honor the flush wishes from the caller, simple commits can
4290 * be done outside the journal lock, they are done below
4291 *
4292 * if we don't flush the commit list right now, we put it into
4293 * the work queue so the people waiting on the async progress work
4294 * queue don't wait for this proc to flush journal lists and such.
4295 */
4296 if (flush) {
4297 flush_commit_list(sb, jl, 1);
4298 flush_journal_list(sb, jl, 1);
4299 } else if (!(jl->j_state & LIST_COMMIT_PENDING)) {
4300 /*
4301 * Avoid queueing work when sb is being shut down. Transaction
4302 * will be flushed on journal shutdown.
4303 */
4304 if (sb->s_flags & MS_ACTIVE)
4305 queue_delayed_work(REISERFS_SB(sb)->commit_wq,
4306 &journal->j_work, HZ / 10);
4307 }
4308
4309 /*
4310 * if the next transaction has any chance of wrapping, flush
4311 * transactions that might get overwritten. If any journal lists
4312 * are very old flush them as well.
4313 */
4314 first_jl:
4315 list_for_each_safe(entry, safe, &journal->j_journal_list) {
4316 temp_jl = JOURNAL_LIST_ENTRY(entry);
4317 if (journal->j_start <= temp_jl->j_start) {
4318 if ((journal->j_start + journal->j_trans_max + 1) >=
4319 temp_jl->j_start) {
4320 flush_used_journal_lists(sb, temp_jl);
4321 goto first_jl;
4322 } else if ((journal->j_start +
4323 journal->j_trans_max + 1) <
4324 SB_ONDISK_JOURNAL_SIZE(sb)) {
4325 /*
4326 * if we don't cross into the next
4327 * transaction and we don't wrap, there is
4328 * no way we can overlap any later transactions
4329 * break now
4330 */
4331 break;
4332 }
4333 } else if ((journal->j_start +
4334 journal->j_trans_max + 1) >
4335 SB_ONDISK_JOURNAL_SIZE(sb)) {
4336 if (((journal->j_start + journal->j_trans_max + 1) %
4337 SB_ONDISK_JOURNAL_SIZE(sb)) >=
4338 temp_jl->j_start) {
4339 flush_used_journal_lists(sb, temp_jl);
4340 goto first_jl;
4341 } else {
4342 /*
4343 * we don't overlap anything from out start
4344 * to the end of the log, and our wrapped
4345 * portion doesn't overlap anything at
4346 * the start of the log. We can break
4347 */
4348 break;
4349 }
4350 }
4351 }
4352
4353 journal->j_current_jl->j_list_bitmap =
4354 get_list_bitmap(sb, journal->j_current_jl);
4355
4356 if (!(journal->j_current_jl->j_list_bitmap)) {
4357 reiserfs_panic(sb, "journal-1996",
4358 "could not get a list bitmap");
4359 }
4360
4361 atomic_set(&journal->j_jlock, 0);
4362 unlock_journal(sb);
4363 /* wake up any body waiting to join. */
4364 clear_bit(J_WRITERS_QUEUED, &journal->j_state);
4365 wake_up(&journal->j_join_wait);
4366
4367 if (!flush && wait_on_commit &&
4368 journal_list_still_alive(sb, commit_trans_id)) {
4369 flush_commit_list(sb, jl, 1);
4370 }
4371 out:
4372 reiserfs_check_lock_depth(sb, "journal end2");
4373
4374 memset(th, 0, sizeof(*th));
4375 /*
4376 * Re-set th->t_super, so we can properly keep track of how many
4377 * persistent transactions there are. We need to do this so if this
4378 * call is part of a failed restart_transaction, we can free it later
4379 */
4380 th->t_super = sb;
4381
4382 return journal->j_errno;
4383 }
4384
4385 /* Send the file system read only and refuse new transactions */
4386 void reiserfs_abort_journal(struct super_block *sb, int errno)
4387 {
4388 struct reiserfs_journal *journal = SB_JOURNAL(sb);
4389 if (test_bit(J_ABORTED, &journal->j_state))
4390 return;
4391
4392 if (!journal->j_errno)
4393 journal->j_errno = errno;
4394
4395 sb->s_flags |= MS_RDONLY;
4396 set_bit(J_ABORTED, &journal->j_state);
4397
4398 #ifdef CONFIG_REISERFS_CHECK
4399 dump_stack();
4400 #endif
4401 }