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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 page_cache_release 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 page_cache_get(page);
609 put_bh(bh);
610 if (!page->mapping)
611 try_to_free_buffers(page);
612 unlock_page(page);
613 page_cache_release(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 char b[BDEVNAME_SIZE];
622
623 if (buffer_journaled(bh)) {
624 reiserfs_warning(NULL, "clm-2084",
625 "pinned buffer %lu:%s sent to disk",
626 bh->b_blocknr, bdevname(bh->b_bdev, b));
627 }
628 if (uptodate)
629 set_buffer_uptodate(bh);
630 else
631 clear_buffer_uptodate(bh);
632
633 unlock_buffer(bh);
634 release_buffer_page(bh);
635 }
636
637 static void reiserfs_end_ordered_io(struct buffer_head *bh, int uptodate)
638 {
639 if (uptodate)
640 set_buffer_uptodate(bh);
641 else
642 clear_buffer_uptodate(bh);
643 unlock_buffer(bh);
644 put_bh(bh);
645 }
646
647 static void submit_logged_buffer(struct buffer_head *bh)
648 {
649 get_bh(bh);
650 bh->b_end_io = reiserfs_end_buffer_io_sync;
651 clear_buffer_journal_new(bh);
652 clear_buffer_dirty(bh);
653 if (!test_clear_buffer_journal_test(bh))
654 BUG();
655 if (!buffer_uptodate(bh))
656 BUG();
657 submit_bh(WRITE, bh);
658 }
659
660 static void submit_ordered_buffer(struct buffer_head *bh)
661 {
662 get_bh(bh);
663 bh->b_end_io = reiserfs_end_ordered_io;
664 clear_buffer_dirty(bh);
665 if (!buffer_uptodate(bh))
666 BUG();
667 submit_bh(WRITE, bh);
668 }
669
670 #define CHUNK_SIZE 32
671 struct buffer_chunk {
672 struct buffer_head *bh[CHUNK_SIZE];
673 int nr;
674 };
675
676 static void write_chunk(struct buffer_chunk *chunk)
677 {
678 int i;
679 for (i = 0; i < chunk->nr; i++) {
680 submit_logged_buffer(chunk->bh[i]);
681 }
682 chunk->nr = 0;
683 }
684
685 static void write_ordered_chunk(struct buffer_chunk *chunk)
686 {
687 int i;
688 for (i = 0; i < chunk->nr; i++) {
689 submit_ordered_buffer(chunk->bh[i]);
690 }
691 chunk->nr = 0;
692 }
693
694 static int add_to_chunk(struct buffer_chunk *chunk, struct buffer_head *bh,
695 spinlock_t * lock, void (fn) (struct buffer_chunk *))
696 {
697 int ret = 0;
698 BUG_ON(chunk->nr >= CHUNK_SIZE);
699 chunk->bh[chunk->nr++] = bh;
700 if (chunk->nr >= CHUNK_SIZE) {
701 ret = 1;
702 if (lock) {
703 spin_unlock(lock);
704 fn(chunk);
705 spin_lock(lock);
706 } else {
707 fn(chunk);
708 }
709 }
710 return ret;
711 }
712
713 static atomic_t nr_reiserfs_jh = ATOMIC_INIT(0);
714 static struct reiserfs_jh *alloc_jh(void)
715 {
716 struct reiserfs_jh *jh;
717 while (1) {
718 jh = kmalloc(sizeof(*jh), GFP_NOFS);
719 if (jh) {
720 atomic_inc(&nr_reiserfs_jh);
721 return jh;
722 }
723 yield();
724 }
725 }
726
727 /*
728 * we want to free the jh when the buffer has been written
729 * and waited on
730 */
731 void reiserfs_free_jh(struct buffer_head *bh)
732 {
733 struct reiserfs_jh *jh;
734
735 jh = bh->b_private;
736 if (jh) {
737 bh->b_private = NULL;
738 jh->bh = NULL;
739 list_del_init(&jh->list);
740 kfree(jh);
741 if (atomic_read(&nr_reiserfs_jh) <= 0)
742 BUG();
743 atomic_dec(&nr_reiserfs_jh);
744 put_bh(bh);
745 }
746 }
747
748 static inline int __add_jh(struct reiserfs_journal *j, struct buffer_head *bh,
749 int tail)
750 {
751 struct reiserfs_jh *jh;
752
753 if (bh->b_private) {
754 spin_lock(&j->j_dirty_buffers_lock);
755 if (!bh->b_private) {
756 spin_unlock(&j->j_dirty_buffers_lock);
757 goto no_jh;
758 }
759 jh = bh->b_private;
760 list_del_init(&jh->list);
761 } else {
762 no_jh:
763 get_bh(bh);
764 jh = alloc_jh();
765 spin_lock(&j->j_dirty_buffers_lock);
766 /*
767 * buffer must be locked for __add_jh, should be able to have
768 * two adds at the same time
769 */
770 BUG_ON(bh->b_private);
771 jh->bh = bh;
772 bh->b_private = jh;
773 }
774 jh->jl = j->j_current_jl;
775 if (tail)
776 list_add_tail(&jh->list, &jh->jl->j_tail_bh_list);
777 else {
778 list_add_tail(&jh->list, &jh->jl->j_bh_list);
779 }
780 spin_unlock(&j->j_dirty_buffers_lock);
781 return 0;
782 }
783
784 int reiserfs_add_tail_list(struct inode *inode, struct buffer_head *bh)
785 {
786 return __add_jh(SB_JOURNAL(inode->i_sb), bh, 1);
787 }
788 int reiserfs_add_ordered_list(struct inode *inode, struct buffer_head *bh)
789 {
790 return __add_jh(SB_JOURNAL(inode->i_sb), bh, 0);
791 }
792
793 #define JH_ENTRY(l) list_entry((l), struct reiserfs_jh, list)
794 static int write_ordered_buffers(spinlock_t * lock,
795 struct reiserfs_journal *j,
796 struct reiserfs_journal_list *jl,
797 struct list_head *list)
798 {
799 struct buffer_head *bh;
800 struct reiserfs_jh *jh;
801 int ret = j->j_errno;
802 struct buffer_chunk chunk;
803 struct list_head tmp;
804 INIT_LIST_HEAD(&tmp);
805
806 chunk.nr = 0;
807 spin_lock(lock);
808 while (!list_empty(list)) {
809 jh = JH_ENTRY(list->next);
810 bh = jh->bh;
811 get_bh(bh);
812 if (!trylock_buffer(bh)) {
813 if (!buffer_dirty(bh)) {
814 list_move(&jh->list, &tmp);
815 goto loop_next;
816 }
817 spin_unlock(lock);
818 if (chunk.nr)
819 write_ordered_chunk(&chunk);
820 wait_on_buffer(bh);
821 cond_resched();
822 spin_lock(lock);
823 goto loop_next;
824 }
825 /*
826 * in theory, dirty non-uptodate buffers should never get here,
827 * but the upper layer io error paths still have a few quirks.
828 * Handle them here as gracefully as we can
829 */
830 if (!buffer_uptodate(bh) && buffer_dirty(bh)) {
831 clear_buffer_dirty(bh);
832 ret = -EIO;
833 }
834 if (buffer_dirty(bh)) {
835 list_move(&jh->list, &tmp);
836 add_to_chunk(&chunk, bh, lock, write_ordered_chunk);
837 } else {
838 reiserfs_free_jh(bh);
839 unlock_buffer(bh);
840 }
841 loop_next:
842 put_bh(bh);
843 cond_resched_lock(lock);
844 }
845 if (chunk.nr) {
846 spin_unlock(lock);
847 write_ordered_chunk(&chunk);
848 spin_lock(lock);
849 }
850 while (!list_empty(&tmp)) {
851 jh = JH_ENTRY(tmp.prev);
852 bh = jh->bh;
853 get_bh(bh);
854 reiserfs_free_jh(bh);
855
856 if (buffer_locked(bh)) {
857 spin_unlock(lock);
858 wait_on_buffer(bh);
859 spin_lock(lock);
860 }
861 if (!buffer_uptodate(bh)) {
862 ret = -EIO;
863 }
864 /*
865 * ugly interaction with invalidatepage here.
866 * reiserfs_invalidate_page will pin any buffer that has a
867 * valid journal head from an older transaction. If someone
868 * else sets our buffer dirty after we write it in the first
869 * loop, and then someone truncates the page away, nobody
870 * will ever write the buffer. We're safe if we write the
871 * page one last time after freeing the journal header.
872 */
873 if (buffer_dirty(bh) && unlikely(bh->b_page->mapping == NULL)) {
874 spin_unlock(lock);
875 ll_rw_block(WRITE, 1, &bh);
876 spin_lock(lock);
877 }
878 put_bh(bh);
879 cond_resched_lock(lock);
880 }
881 spin_unlock(lock);
882 return ret;
883 }
884
885 static int flush_older_commits(struct super_block *s,
886 struct reiserfs_journal_list *jl)
887 {
888 struct reiserfs_journal *journal = SB_JOURNAL(s);
889 struct reiserfs_journal_list *other_jl;
890 struct reiserfs_journal_list *first_jl;
891 struct list_head *entry;
892 unsigned int trans_id = jl->j_trans_id;
893 unsigned int other_trans_id;
894 unsigned int first_trans_id;
895
896 find_first:
897 /*
898 * first we walk backwards to find the oldest uncommitted transation
899 */
900 first_jl = jl;
901 entry = jl->j_list.prev;
902 while (1) {
903 other_jl = JOURNAL_LIST_ENTRY(entry);
904 if (entry == &journal->j_journal_list ||
905 atomic_read(&other_jl->j_older_commits_done))
906 break;
907
908 first_jl = other_jl;
909 entry = other_jl->j_list.prev;
910 }
911
912 /* if we didn't find any older uncommitted transactions, return now */
913 if (first_jl == jl) {
914 return 0;
915 }
916
917 first_trans_id = first_jl->j_trans_id;
918
919 entry = &first_jl->j_list;
920 while (1) {
921 other_jl = JOURNAL_LIST_ENTRY(entry);
922 other_trans_id = other_jl->j_trans_id;
923
924 if (other_trans_id < trans_id) {
925 if (atomic_read(&other_jl->j_commit_left) != 0) {
926 flush_commit_list(s, other_jl, 0);
927
928 /* list we were called with is gone, return */
929 if (!journal_list_still_alive(s, trans_id))
930 return 1;
931
932 /*
933 * the one we just flushed is gone, this means
934 * all older lists are also gone, so first_jl
935 * is no longer valid either. Go back to the
936 * beginning.
937 */
938 if (!journal_list_still_alive
939 (s, other_trans_id)) {
940 goto find_first;
941 }
942 }
943 entry = entry->next;
944 if (entry == &journal->j_journal_list)
945 return 0;
946 } else {
947 return 0;
948 }
949 }
950 return 0;
951 }
952
953 static int reiserfs_async_progress_wait(struct super_block *s)
954 {
955 struct reiserfs_journal *j = SB_JOURNAL(s);
956
957 if (atomic_read(&j->j_async_throttle)) {
958 int depth;
959
960 depth = reiserfs_write_unlock_nested(s);
961 congestion_wait(BLK_RW_ASYNC, HZ / 10);
962 reiserfs_write_lock_nested(s, depth);
963 }
964
965 return 0;
966 }
967
968 /*
969 * if this journal list still has commit blocks unflushed, send them to disk.
970 *
971 * log areas must be flushed in order (transaction 2 can't commit before
972 * transaction 1) Before the commit block can by written, every other log
973 * block must be safely on disk
974 */
975 static int flush_commit_list(struct super_block *s,
976 struct reiserfs_journal_list *jl, int flushall)
977 {
978 int i;
979 b_blocknr_t bn;
980 struct buffer_head *tbh = NULL;
981 unsigned int trans_id = jl->j_trans_id;
982 struct reiserfs_journal *journal = SB_JOURNAL(s);
983 int retval = 0;
984 int write_len;
985 int depth;
986
987 reiserfs_check_lock_depth(s, "flush_commit_list");
988
989 if (atomic_read(&jl->j_older_commits_done)) {
990 return 0;
991 }
992
993 /*
994 * before we can put our commit blocks on disk, we have to make
995 * sure everyone older than us is on disk too
996 */
997 BUG_ON(jl->j_len <= 0);
998 BUG_ON(trans_id == journal->j_trans_id);
999
1000 get_journal_list(jl);
1001 if (flushall) {
1002 if (flush_older_commits(s, jl) == 1) {
1003 /*
1004 * list disappeared during flush_older_commits.
1005 * return
1006 */
1007 goto put_jl;
1008 }
1009 }
1010
1011 /* make sure nobody is trying to flush this one at the same time */
1012 reiserfs_mutex_lock_safe(&jl->j_commit_mutex, s);
1013
1014 if (!journal_list_still_alive(s, trans_id)) {
1015 mutex_unlock(&jl->j_commit_mutex);
1016 goto put_jl;
1017 }
1018 BUG_ON(jl->j_trans_id == 0);
1019
1020 /* this commit is done, exit */
1021 if (atomic_read(&jl->j_commit_left) <= 0) {
1022 if (flushall) {
1023 atomic_set(&jl->j_older_commits_done, 1);
1024 }
1025 mutex_unlock(&jl->j_commit_mutex);
1026 goto put_jl;
1027 }
1028
1029 if (!list_empty(&jl->j_bh_list)) {
1030 int ret;
1031
1032 /*
1033 * We might sleep in numerous places inside
1034 * write_ordered_buffers. Relax the write lock.
1035 */
1036 depth = reiserfs_write_unlock_nested(s);
1037 ret = write_ordered_buffers(&journal->j_dirty_buffers_lock,
1038 journal, jl, &jl->j_bh_list);
1039 if (ret < 0 && retval == 0)
1040 retval = ret;
1041 reiserfs_write_lock_nested(s, depth);
1042 }
1043 BUG_ON(!list_empty(&jl->j_bh_list));
1044 /*
1045 * for the description block and all the log blocks, submit any buffers
1046 * that haven't already reached the disk. Try to write at least 256
1047 * log blocks. later on, we will only wait on blocks that correspond
1048 * to this transaction, but while we're unplugging we might as well
1049 * get a chunk of data on there.
1050 */
1051 atomic_inc(&journal->j_async_throttle);
1052 write_len = jl->j_len + 1;
1053 if (write_len < 256)
1054 write_len = 256;
1055 for (i = 0 ; i < write_len ; i++) {
1056 bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) + (jl->j_start + i) %
1057 SB_ONDISK_JOURNAL_SIZE(s);
1058 tbh = journal_find_get_block(s, bn);
1059 if (tbh) {
1060 if (buffer_dirty(tbh)) {
1061 depth = reiserfs_write_unlock_nested(s);
1062 ll_rw_block(WRITE, 1, &tbh);
1063 reiserfs_write_lock_nested(s, depth);
1064 }
1065 put_bh(tbh) ;
1066 }
1067 }
1068 atomic_dec(&journal->j_async_throttle);
1069
1070 for (i = 0; i < (jl->j_len + 1); i++) {
1071 bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) +
1072 (jl->j_start + i) % SB_ONDISK_JOURNAL_SIZE(s);
1073 tbh = journal_find_get_block(s, bn);
1074
1075 depth = reiserfs_write_unlock_nested(s);
1076 __wait_on_buffer(tbh);
1077 reiserfs_write_lock_nested(s, depth);
1078 /*
1079 * since we're using ll_rw_blk above, it might have skipped
1080 * over a locked buffer. Double check here
1081 */
1082 /* redundant, sync_dirty_buffer() checks */
1083 if (buffer_dirty(tbh)) {
1084 depth = reiserfs_write_unlock_nested(s);
1085 sync_dirty_buffer(tbh);
1086 reiserfs_write_lock_nested(s, depth);
1087 }
1088 if (unlikely(!buffer_uptodate(tbh))) {
1089 #ifdef CONFIG_REISERFS_CHECK
1090 reiserfs_warning(s, "journal-601",
1091 "buffer write failed");
1092 #endif
1093 retval = -EIO;
1094 }
1095 /* once for journal_find_get_block */
1096 put_bh(tbh);
1097 /* once due to original getblk in do_journal_end */
1098 put_bh(tbh);
1099 atomic_dec(&jl->j_commit_left);
1100 }
1101
1102 BUG_ON(atomic_read(&jl->j_commit_left) != 1);
1103
1104 /*
1105 * If there was a write error in the journal - we can't commit
1106 * this transaction - it will be invalid and, if successful,
1107 * will just end up propagating the write error out to
1108 * the file system.
1109 */
1110 if (likely(!retval && !reiserfs_is_journal_aborted (journal))) {
1111 if (buffer_dirty(jl->j_commit_bh))
1112 BUG();
1113 mark_buffer_dirty(jl->j_commit_bh) ;
1114 depth = reiserfs_write_unlock_nested(s);
1115 if (reiserfs_barrier_flush(s))
1116 __sync_dirty_buffer(jl->j_commit_bh, WRITE_FLUSH_FUA);
1117 else
1118 sync_dirty_buffer(jl->j_commit_bh);
1119 reiserfs_write_lock_nested(s, depth);
1120 }
1121
1122 /*
1123 * If there was a write error in the journal - we can't commit this
1124 * transaction - it will be invalid and, if successful, will just end
1125 * up propagating the write error out to the filesystem.
1126 */
1127 if (unlikely(!buffer_uptodate(jl->j_commit_bh))) {
1128 #ifdef CONFIG_REISERFS_CHECK
1129 reiserfs_warning(s, "journal-615", "buffer write failed");
1130 #endif
1131 retval = -EIO;
1132 }
1133 bforget(jl->j_commit_bh);
1134 if (journal->j_last_commit_id != 0 &&
1135 (jl->j_trans_id - journal->j_last_commit_id) != 1) {
1136 reiserfs_warning(s, "clm-2200", "last commit %lu, current %lu",
1137 journal->j_last_commit_id, jl->j_trans_id);
1138 }
1139 journal->j_last_commit_id = jl->j_trans_id;
1140
1141 /*
1142 * now, every commit block is on the disk. It is safe to allow
1143 * blocks freed during this transaction to be reallocated
1144 */
1145 cleanup_freed_for_journal_list(s, jl);
1146
1147 retval = retval ? retval : journal->j_errno;
1148
1149 /* mark the metadata dirty */
1150 if (!retval)
1151 dirty_one_transaction(s, jl);
1152 atomic_dec(&jl->j_commit_left);
1153
1154 if (flushall) {
1155 atomic_set(&jl->j_older_commits_done, 1);
1156 }
1157 mutex_unlock(&jl->j_commit_mutex);
1158 put_jl:
1159 put_journal_list(s, jl);
1160
1161 if (retval)
1162 reiserfs_abort(s, retval, "Journal write error in %s",
1163 __func__);
1164 return retval;
1165 }
1166
1167 /*
1168 * flush_journal_list frequently needs to find a newer transaction for a
1169 * given block. This does that, or returns NULL if it can't find anything
1170 */
1171 static struct reiserfs_journal_list *find_newer_jl_for_cn(struct
1172 reiserfs_journal_cnode
1173 *cn)
1174 {
1175 struct super_block *sb = cn->sb;
1176 b_blocknr_t blocknr = cn->blocknr;
1177
1178 cn = cn->hprev;
1179 while (cn) {
1180 if (cn->sb == sb && cn->blocknr == blocknr && cn->jlist) {
1181 return cn->jlist;
1182 }
1183 cn = cn->hprev;
1184 }
1185 return NULL;
1186 }
1187
1188 static void remove_journal_hash(struct super_block *,
1189 struct reiserfs_journal_cnode **,
1190 struct reiserfs_journal_list *, unsigned long,
1191 int);
1192
1193 /*
1194 * once all the real blocks have been flushed, it is safe to remove them
1195 * from the journal list for this transaction. Aside from freeing the
1196 * cnode, this also allows the block to be reallocated for data blocks
1197 * if it had been deleted.
1198 */
1199 static void remove_all_from_journal_list(struct super_block *sb,
1200 struct reiserfs_journal_list *jl,
1201 int debug)
1202 {
1203 struct reiserfs_journal *journal = SB_JOURNAL(sb);
1204 struct reiserfs_journal_cnode *cn, *last;
1205 cn = jl->j_realblock;
1206
1207 /*
1208 * which is better, to lock once around the whole loop, or
1209 * to lock for each call to remove_journal_hash?
1210 */
1211 while (cn) {
1212 if (cn->blocknr != 0) {
1213 if (debug) {
1214 reiserfs_warning(sb, "reiserfs-2201",
1215 "block %u, bh is %d, state %ld",
1216 cn->blocknr, cn->bh ? 1 : 0,
1217 cn->state);
1218 }
1219 cn->state = 0;
1220 remove_journal_hash(sb, journal->j_list_hash_table,
1221 jl, cn->blocknr, 1);
1222 }
1223 last = cn;
1224 cn = cn->next;
1225 free_cnode(sb, last);
1226 }
1227 jl->j_realblock = NULL;
1228 }
1229
1230 /*
1231 * if this timestamp is greater than the timestamp we wrote last to the
1232 * header block, write it to the header block. once this is done, I can
1233 * safely say the log area for this transaction won't ever be replayed,
1234 * and I can start releasing blocks in this transaction for reuse as data
1235 * blocks. called by flush_journal_list, before it calls
1236 * remove_all_from_journal_list
1237 */
1238 static int _update_journal_header_block(struct super_block *sb,
1239 unsigned long offset,
1240 unsigned int trans_id)
1241 {
1242 struct reiserfs_journal_header *jh;
1243 struct reiserfs_journal *journal = SB_JOURNAL(sb);
1244 int depth;
1245
1246 if (reiserfs_is_journal_aborted(journal))
1247 return -EIO;
1248
1249 if (trans_id >= journal->j_last_flush_trans_id) {
1250 if (buffer_locked((journal->j_header_bh))) {
1251 depth = reiserfs_write_unlock_nested(sb);
1252 __wait_on_buffer(journal->j_header_bh);
1253 reiserfs_write_lock_nested(sb, depth);
1254 if (unlikely(!buffer_uptodate(journal->j_header_bh))) {
1255 #ifdef CONFIG_REISERFS_CHECK
1256 reiserfs_warning(sb, "journal-699",
1257 "buffer write failed");
1258 #endif
1259 return -EIO;
1260 }
1261 }
1262 journal->j_last_flush_trans_id = trans_id;
1263 journal->j_first_unflushed_offset = offset;
1264 jh = (struct reiserfs_journal_header *)(journal->j_header_bh->
1265 b_data);
1266 jh->j_last_flush_trans_id = cpu_to_le32(trans_id);
1267 jh->j_first_unflushed_offset = cpu_to_le32(offset);
1268 jh->j_mount_id = cpu_to_le32(journal->j_mount_id);
1269
1270 set_buffer_dirty(journal->j_header_bh);
1271 depth = reiserfs_write_unlock_nested(sb);
1272
1273 if (reiserfs_barrier_flush(sb))
1274 __sync_dirty_buffer(journal->j_header_bh, WRITE_FLUSH_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 cancel_delayed_work_sync(&REISERFS_SB(sb)->old_work);
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(READ, 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], WRITE);
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(READ, 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 char b[BDEVNAME_SIZE];
2391
2392 cur_dblock = SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2393 reiserfs_info(sb, "checking transaction log (%s)\n",
2394 bdevname(journal->j_dev_bd, b));
2395 start = get_seconds();
2396
2397 /*
2398 * step 1, read in the journal header block. Check the transaction
2399 * it says is the first unflushed, and if that transaction is not
2400 * valid, replay is done
2401 */
2402 journal->j_header_bh = journal_bread(sb,
2403 SB_ONDISK_JOURNAL_1st_BLOCK(sb)
2404 + SB_ONDISK_JOURNAL_SIZE(sb));
2405 if (!journal->j_header_bh) {
2406 return 1;
2407 }
2408 jh = (struct reiserfs_journal_header *)(journal->j_header_bh->b_data);
2409 if (le32_to_cpu(jh->j_first_unflushed_offset) <
2410 SB_ONDISK_JOURNAL_SIZE(sb)
2411 && le32_to_cpu(jh->j_last_flush_trans_id) > 0) {
2412 oldest_start =
2413 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2414 le32_to_cpu(jh->j_first_unflushed_offset);
2415 oldest_trans_id = le32_to_cpu(jh->j_last_flush_trans_id) + 1;
2416 newest_mount_id = le32_to_cpu(jh->j_mount_id);
2417 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2418 "journal-1153: found in "
2419 "header: first_unflushed_offset %d, last_flushed_trans_id "
2420 "%lu", le32_to_cpu(jh->j_first_unflushed_offset),
2421 le32_to_cpu(jh->j_last_flush_trans_id));
2422 valid_journal_header = 1;
2423
2424 /*
2425 * now, we try to read the first unflushed offset. If it
2426 * is not valid, there is nothing more we can do, and it
2427 * makes no sense to read through the whole log.
2428 */
2429 d_bh =
2430 journal_bread(sb,
2431 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2432 le32_to_cpu(jh->j_first_unflushed_offset));
2433 ret = journal_transaction_is_valid(sb, d_bh, NULL, NULL);
2434 if (!ret) {
2435 continue_replay = 0;
2436 }
2437 brelse(d_bh);
2438 goto start_log_replay;
2439 }
2440
2441 /*
2442 * ok, there are transactions that need to be replayed. start
2443 * with the first log block, find all the valid transactions, and
2444 * pick out the oldest.
2445 */
2446 while (continue_replay
2447 && cur_dblock <
2448 (SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2449 SB_ONDISK_JOURNAL_SIZE(sb))) {
2450 /*
2451 * Note that it is required for blocksize of primary fs
2452 * device and journal device to be the same
2453 */
2454 d_bh =
2455 reiserfs_breada(journal->j_dev_bd, cur_dblock,
2456 sb->s_blocksize,
2457 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2458 SB_ONDISK_JOURNAL_SIZE(sb));
2459 ret =
2460 journal_transaction_is_valid(sb, d_bh,
2461 &oldest_invalid_trans_id,
2462 &newest_mount_id);
2463 if (ret == 1) {
2464 desc = (struct reiserfs_journal_desc *)d_bh->b_data;
2465 if (oldest_start == 0) { /* init all oldest_ values */
2466 oldest_trans_id = get_desc_trans_id(desc);
2467 oldest_start = d_bh->b_blocknr;
2468 newest_mount_id = get_desc_mount_id(desc);
2469 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2470 "journal-1179: Setting "
2471 "oldest_start to offset %llu, trans_id %lu",
2472 oldest_start -
2473 SB_ONDISK_JOURNAL_1st_BLOCK
2474 (sb), oldest_trans_id);
2475 } else if (oldest_trans_id > get_desc_trans_id(desc)) {
2476 /* one we just read was older */
2477 oldest_trans_id = get_desc_trans_id(desc);
2478 oldest_start = d_bh->b_blocknr;
2479 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2480 "journal-1180: Resetting "
2481 "oldest_start to offset %lu, trans_id %lu",
2482 oldest_start -
2483 SB_ONDISK_JOURNAL_1st_BLOCK
2484 (sb), oldest_trans_id);
2485 }
2486 if (newest_mount_id < get_desc_mount_id(desc)) {
2487 newest_mount_id = get_desc_mount_id(desc);
2488 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2489 "journal-1299: Setting "
2490 "newest_mount_id to %d",
2491 get_desc_mount_id(desc));
2492 }
2493 cur_dblock += get_desc_trans_len(desc) + 2;
2494 } else {
2495 cur_dblock++;
2496 }
2497 brelse(d_bh);
2498 }
2499
2500 start_log_replay:
2501 cur_dblock = oldest_start;
2502 if (oldest_trans_id) {
2503 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2504 "journal-1206: Starting replay "
2505 "from offset %llu, trans_id %lu",
2506 cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2507 oldest_trans_id);
2508
2509 }
2510 replay_count = 0;
2511 while (continue_replay && oldest_trans_id > 0) {
2512 ret =
2513 journal_read_transaction(sb, cur_dblock, oldest_start,
2514 oldest_trans_id, newest_mount_id);
2515 if (ret < 0) {
2516 return ret;
2517 } else if (ret != 0) {
2518 break;
2519 }
2520 cur_dblock =
2521 SB_ONDISK_JOURNAL_1st_BLOCK(sb) + journal->j_start;
2522 replay_count++;
2523 if (cur_dblock == oldest_start)
2524 break;
2525 }
2526
2527 if (oldest_trans_id == 0) {
2528 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2529 "journal-1225: No valid " "transactions found");
2530 }
2531 /*
2532 * j_start does not get set correctly if we don't replay any
2533 * transactions. if we had a valid journal_header, set j_start
2534 * to the first unflushed transaction value, copy the trans_id
2535 * from the header
2536 */
2537 if (valid_journal_header && replay_count == 0) {
2538 journal->j_start = le32_to_cpu(jh->j_first_unflushed_offset);
2539 journal->j_trans_id =
2540 le32_to_cpu(jh->j_last_flush_trans_id) + 1;
2541 /* check for trans_id overflow */
2542 if (journal->j_trans_id == 0)
2543 journal->j_trans_id = 10;
2544 journal->j_last_flush_trans_id =
2545 le32_to_cpu(jh->j_last_flush_trans_id);
2546 journal->j_mount_id = le32_to_cpu(jh->j_mount_id) + 1;
2547 } else {
2548 journal->j_mount_id = newest_mount_id + 1;
2549 }
2550 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1299: Setting "
2551 "newest_mount_id to %lu", journal->j_mount_id);
2552 journal->j_first_unflushed_offset = journal->j_start;
2553 if (replay_count > 0) {
2554 reiserfs_info(sb,
2555 "replayed %d transactions in %lu seconds\n",
2556 replay_count, get_seconds() - start);
2557 }
2558 /* needed to satisfy the locking in _update_journal_header_block */
2559 reiserfs_write_lock(sb);
2560 if (!bdev_read_only(sb->s_bdev) &&
2561 _update_journal_header_block(sb, journal->j_start,
2562 journal->j_last_flush_trans_id)) {
2563 reiserfs_write_unlock(sb);
2564 /*
2565 * replay failed, caller must call free_journal_ram and abort
2566 * the mount
2567 */
2568 return -1;
2569 }
2570 reiserfs_write_unlock(sb);
2571 return 0;
2572 }
2573
2574 static struct reiserfs_journal_list *alloc_journal_list(struct super_block *s)
2575 {
2576 struct reiserfs_journal_list *jl;
2577 jl = kzalloc(sizeof(struct reiserfs_journal_list),
2578 GFP_NOFS | __GFP_NOFAIL);
2579 INIT_LIST_HEAD(&jl->j_list);
2580 INIT_LIST_HEAD(&jl->j_working_list);
2581 INIT_LIST_HEAD(&jl->j_tail_bh_list);
2582 INIT_LIST_HEAD(&jl->j_bh_list);
2583 mutex_init(&jl->j_commit_mutex);
2584 SB_JOURNAL(s)->j_num_lists++;
2585 get_journal_list(jl);
2586 return jl;
2587 }
2588
2589 static void journal_list_init(struct super_block *sb)
2590 {
2591 SB_JOURNAL(sb)->j_current_jl = alloc_journal_list(sb);
2592 }
2593
2594 static void release_journal_dev(struct super_block *super,
2595 struct reiserfs_journal *journal)
2596 {
2597 if (journal->j_dev_bd != NULL) {
2598 blkdev_put(journal->j_dev_bd, journal->j_dev_mode);
2599 journal->j_dev_bd = NULL;
2600 }
2601 }
2602
2603 static int journal_init_dev(struct super_block *super,
2604 struct reiserfs_journal *journal,
2605 const char *jdev_name)
2606 {
2607 int result;
2608 dev_t jdev;
2609 fmode_t blkdev_mode = FMODE_READ | FMODE_WRITE | FMODE_EXCL;
2610 char b[BDEVNAME_SIZE];
2611
2612 result = 0;
2613
2614 journal->j_dev_bd = NULL;
2615 jdev = SB_ONDISK_JOURNAL_DEVICE(super) ?
2616 new_decode_dev(SB_ONDISK_JOURNAL_DEVICE(super)) : super->s_dev;
2617
2618 if (bdev_read_only(super->s_bdev))
2619 blkdev_mode = FMODE_READ;
2620
2621 /* there is no "jdev" option and journal is on separate device */
2622 if ((!jdev_name || !jdev_name[0])) {
2623 if (jdev == super->s_dev)
2624 blkdev_mode &= ~FMODE_EXCL;
2625 journal->j_dev_bd = blkdev_get_by_dev(jdev, blkdev_mode,
2626 journal);
2627 journal->j_dev_mode = blkdev_mode;
2628 if (IS_ERR(journal->j_dev_bd)) {
2629 result = PTR_ERR(journal->j_dev_bd);
2630 journal->j_dev_bd = NULL;
2631 reiserfs_warning(super, "sh-458",
2632 "cannot init journal device '%s': %i",
2633 __bdevname(jdev, b), result);
2634 return result;
2635 } else if (jdev != super->s_dev)
2636 set_blocksize(journal->j_dev_bd, super->s_blocksize);
2637
2638 return 0;
2639 }
2640
2641 journal->j_dev_mode = blkdev_mode;
2642 journal->j_dev_bd = blkdev_get_by_path(jdev_name, blkdev_mode, journal);
2643 if (IS_ERR(journal->j_dev_bd)) {
2644 result = PTR_ERR(journal->j_dev_bd);
2645 journal->j_dev_bd = NULL;
2646 reiserfs_warning(super,
2647 "journal_init_dev: Cannot open '%s': %i",
2648 jdev_name, result);
2649 return result;
2650 }
2651
2652 set_blocksize(journal->j_dev_bd, super->s_blocksize);
2653 reiserfs_info(super,
2654 "journal_init_dev: journal device: %s\n",
2655 bdevname(journal->j_dev_bd, b));
2656 return 0;
2657 }
2658
2659 /*
2660 * When creating/tuning a file system user can assign some
2661 * journal params within boundaries which depend on the ratio
2662 * blocksize/standard_blocksize.
2663 *
2664 * For blocks >= standard_blocksize transaction size should
2665 * be not less then JOURNAL_TRANS_MIN_DEFAULT, and not more
2666 * then JOURNAL_TRANS_MAX_DEFAULT.
2667 *
2668 * For blocks < standard_blocksize these boundaries should be
2669 * decreased proportionally.
2670 */
2671 #define REISERFS_STANDARD_BLKSIZE (4096)
2672
2673 static int check_advise_trans_params(struct super_block *sb,
2674 struct reiserfs_journal *journal)
2675 {
2676 if (journal->j_trans_max) {
2677 /* Non-default journal params. Do sanity check for them. */
2678 int ratio = 1;
2679 if (sb->s_blocksize < REISERFS_STANDARD_BLKSIZE)
2680 ratio = REISERFS_STANDARD_BLKSIZE / sb->s_blocksize;
2681
2682 if (journal->j_trans_max > JOURNAL_TRANS_MAX_DEFAULT / ratio ||
2683 journal->j_trans_max < JOURNAL_TRANS_MIN_DEFAULT / ratio ||
2684 SB_ONDISK_JOURNAL_SIZE(sb) / journal->j_trans_max <
2685 JOURNAL_MIN_RATIO) {
2686 reiserfs_warning(sb, "sh-462",
2687 "bad transaction max size (%u). "
2688 "FSCK?", journal->j_trans_max);
2689 return 1;
2690 }
2691 if (journal->j_max_batch != (journal->j_trans_max) *
2692 JOURNAL_MAX_BATCH_DEFAULT/JOURNAL_TRANS_MAX_DEFAULT) {
2693 reiserfs_warning(sb, "sh-463",
2694 "bad transaction max batch (%u). "
2695 "FSCK?", journal->j_max_batch);
2696 return 1;
2697 }
2698 } else {
2699 /*
2700 * Default journal params.
2701 * The file system was created by old version
2702 * of mkreiserfs, so some fields contain zeros,
2703 * and we need to advise proper values for them
2704 */
2705 if (sb->s_blocksize != REISERFS_STANDARD_BLKSIZE) {
2706 reiserfs_warning(sb, "sh-464", "bad blocksize (%u)",
2707 sb->s_blocksize);
2708 return 1;
2709 }
2710 journal->j_trans_max = JOURNAL_TRANS_MAX_DEFAULT;
2711 journal->j_max_batch = JOURNAL_MAX_BATCH_DEFAULT;
2712 journal->j_max_commit_age = JOURNAL_MAX_COMMIT_AGE;
2713 }
2714 return 0;
2715 }
2716
2717 /* must be called once on fs mount. calls journal_read for you */
2718 int journal_init(struct super_block *sb, const char *j_dev_name,
2719 int old_format, unsigned int commit_max_age)
2720 {
2721 int num_cnodes = SB_ONDISK_JOURNAL_SIZE(sb) * 2;
2722 struct buffer_head *bhjh;
2723 struct reiserfs_super_block *rs;
2724 struct reiserfs_journal_header *jh;
2725 struct reiserfs_journal *journal;
2726 struct reiserfs_journal_list *jl;
2727 char b[BDEVNAME_SIZE];
2728 int ret;
2729
2730 journal = SB_JOURNAL(sb) = vzalloc(sizeof(struct reiserfs_journal));
2731 if (!journal) {
2732 reiserfs_warning(sb, "journal-1256",
2733 "unable to get memory for journal structure");
2734 return 1;
2735 }
2736 INIT_LIST_HEAD(&journal->j_bitmap_nodes);
2737 INIT_LIST_HEAD(&journal->j_prealloc_list);
2738 INIT_LIST_HEAD(&journal->j_working_list);
2739 INIT_LIST_HEAD(&journal->j_journal_list);
2740 journal->j_persistent_trans = 0;
2741 if (reiserfs_allocate_list_bitmaps(sb, journal->j_list_bitmap,
2742 reiserfs_bmap_count(sb)))
2743 goto free_and_return;
2744
2745 allocate_bitmap_nodes(sb);
2746
2747 /* reserved for journal area support */
2748 SB_JOURNAL_1st_RESERVED_BLOCK(sb) = (old_format ?
2749 REISERFS_OLD_DISK_OFFSET_IN_BYTES
2750 / sb->s_blocksize +
2751 reiserfs_bmap_count(sb) +
2752 1 :
2753 REISERFS_DISK_OFFSET_IN_BYTES /
2754 sb->s_blocksize + 2);
2755
2756 /*
2757 * Sanity check to see is the standard journal fitting
2758 * within first bitmap (actual for small blocksizes)
2759 */
2760 if (!SB_ONDISK_JOURNAL_DEVICE(sb) &&
2761 (SB_JOURNAL_1st_RESERVED_BLOCK(sb) +
2762 SB_ONDISK_JOURNAL_SIZE(sb) > sb->s_blocksize * 8)) {
2763 reiserfs_warning(sb, "journal-1393",
2764 "journal does not fit for area addressed "
2765 "by first of bitmap blocks. It starts at "
2766 "%u and its size is %u. Block size %ld",
2767 SB_JOURNAL_1st_RESERVED_BLOCK(sb),
2768 SB_ONDISK_JOURNAL_SIZE(sb),
2769 sb->s_blocksize);
2770 goto free_and_return;
2771 }
2772
2773 if (journal_init_dev(sb, journal, j_dev_name) != 0) {
2774 reiserfs_warning(sb, "sh-462",
2775 "unable to initialize journal device");
2776 goto free_and_return;
2777 }
2778
2779 rs = SB_DISK_SUPER_BLOCK(sb);
2780
2781 /* read journal header */
2782 bhjh = journal_bread(sb,
2783 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2784 SB_ONDISK_JOURNAL_SIZE(sb));
2785 if (!bhjh) {
2786 reiserfs_warning(sb, "sh-459",
2787 "unable to read journal header");
2788 goto free_and_return;
2789 }
2790 jh = (struct reiserfs_journal_header *)(bhjh->b_data);
2791
2792 /* make sure that journal matches to the super block */
2793 if (is_reiserfs_jr(rs)
2794 && (le32_to_cpu(jh->jh_journal.jp_journal_magic) !=
2795 sb_jp_journal_magic(rs))) {
2796 reiserfs_warning(sb, "sh-460",
2797 "journal header magic %x (device %s) does "
2798 "not match to magic found in super block %x",
2799 jh->jh_journal.jp_journal_magic,
2800 bdevname(journal->j_dev_bd, b),
2801 sb_jp_journal_magic(rs));
2802 brelse(bhjh);
2803 goto free_and_return;
2804 }
2805
2806 journal->j_trans_max = le32_to_cpu(jh->jh_journal.jp_journal_trans_max);
2807 journal->j_max_batch = le32_to_cpu(jh->jh_journal.jp_journal_max_batch);
2808 journal->j_max_commit_age =
2809 le32_to_cpu(jh->jh_journal.jp_journal_max_commit_age);
2810 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
2811
2812 if (check_advise_trans_params(sb, journal) != 0)
2813 goto free_and_return;
2814 journal->j_default_max_commit_age = journal->j_max_commit_age;
2815
2816 if (commit_max_age != 0) {
2817 journal->j_max_commit_age = commit_max_age;
2818 journal->j_max_trans_age = commit_max_age;
2819 }
2820
2821 reiserfs_info(sb, "journal params: device %s, size %u, "
2822 "journal first block %u, max trans len %u, max batch %u, "
2823 "max commit age %u, max trans age %u\n",
2824 bdevname(journal->j_dev_bd, b),
2825 SB_ONDISK_JOURNAL_SIZE(sb),
2826 SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2827 journal->j_trans_max,
2828 journal->j_max_batch,
2829 journal->j_max_commit_age, journal->j_max_trans_age);
2830
2831 brelse(bhjh);
2832
2833 journal->j_list_bitmap_index = 0;
2834 journal_list_init(sb);
2835
2836 memset(journal->j_list_hash_table, 0,
2837 JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *));
2838
2839 INIT_LIST_HEAD(&journal->j_dirty_buffers);
2840 spin_lock_init(&journal->j_dirty_buffers_lock);
2841
2842 journal->j_start = 0;
2843 journal->j_len = 0;
2844 journal->j_len_alloc = 0;
2845 atomic_set(&journal->j_wcount, 0);
2846 atomic_set(&journal->j_async_throttle, 0);
2847 journal->j_bcount = 0;
2848 journal->j_trans_start_time = 0;
2849 journal->j_last = NULL;
2850 journal->j_first = NULL;
2851 init_waitqueue_head(&journal->j_join_wait);
2852 mutex_init(&journal->j_mutex);
2853 mutex_init(&journal->j_flush_mutex);
2854
2855 journal->j_trans_id = 10;
2856 journal->j_mount_id = 10;
2857 journal->j_state = 0;
2858 atomic_set(&journal->j_jlock, 0);
2859 journal->j_cnode_free_list = allocate_cnodes(num_cnodes);
2860 journal->j_cnode_free_orig = journal->j_cnode_free_list;
2861 journal->j_cnode_free = journal->j_cnode_free_list ? num_cnodes : 0;
2862 journal->j_cnode_used = 0;
2863 journal->j_must_wait = 0;
2864
2865 if (journal->j_cnode_free == 0) {
2866 reiserfs_warning(sb, "journal-2004", "Journal cnode memory "
2867 "allocation failed (%ld bytes). Journal is "
2868 "too large for available memory. Usually "
2869 "this is due to a journal that is too large.",
2870 sizeof (struct reiserfs_journal_cnode) * num_cnodes);
2871 goto free_and_return;
2872 }
2873
2874 init_journal_hash(sb);
2875 jl = journal->j_current_jl;
2876
2877 /*
2878 * get_list_bitmap() may call flush_commit_list() which
2879 * requires the lock. Calling flush_commit_list() shouldn't happen
2880 * this early but I like to be paranoid.
2881 */
2882 reiserfs_write_lock(sb);
2883 jl->j_list_bitmap = get_list_bitmap(sb, jl);
2884 reiserfs_write_unlock(sb);
2885 if (!jl->j_list_bitmap) {
2886 reiserfs_warning(sb, "journal-2005",
2887 "get_list_bitmap failed for journal list 0");
2888 goto free_and_return;
2889 }
2890
2891 ret = journal_read(sb);
2892 if (ret < 0) {
2893 reiserfs_warning(sb, "reiserfs-2006",
2894 "Replay Failure, unable to mount");
2895 goto free_and_return;
2896 }
2897
2898 INIT_DELAYED_WORK(&journal->j_work, flush_async_commits);
2899 journal->j_work_sb = sb;
2900 return 0;
2901 free_and_return:
2902 free_journal_ram(sb);
2903 return 1;
2904 }
2905
2906 /*
2907 * test for a polite end of the current transaction. Used by file_write,
2908 * and should be used by delete to make sure they don't write more than
2909 * can fit inside a single transaction
2910 */
2911 int journal_transaction_should_end(struct reiserfs_transaction_handle *th,
2912 int new_alloc)
2913 {
2914 struct reiserfs_journal *journal = SB_JOURNAL(th->t_super);
2915 time_t now = get_seconds();
2916 /* cannot restart while nested */
2917 BUG_ON(!th->t_trans_id);
2918 if (th->t_refcount > 1)
2919 return 0;
2920 if (journal->j_must_wait > 0 ||
2921 (journal->j_len_alloc + new_alloc) >= journal->j_max_batch ||
2922 atomic_read(&journal->j_jlock) ||
2923 (now - journal->j_trans_start_time) > journal->j_max_trans_age ||
2924 journal->j_cnode_free < (journal->j_trans_max * 3)) {
2925 return 1;
2926 }
2927
2928 journal->j_len_alloc += new_alloc;
2929 th->t_blocks_allocated += new_alloc ;
2930 return 0;
2931 }
2932
2933 /* this must be called inside a transaction */
2934 void reiserfs_block_writes(struct reiserfs_transaction_handle *th)
2935 {
2936 struct reiserfs_journal *journal = SB_JOURNAL(th->t_super);
2937 BUG_ON(!th->t_trans_id);
2938 journal->j_must_wait = 1;
2939 set_bit(J_WRITERS_BLOCKED, &journal->j_state);
2940 return;
2941 }
2942
2943 /* this must be called without a transaction started */
2944 void reiserfs_allow_writes(struct super_block *s)
2945 {
2946 struct reiserfs_journal *journal = SB_JOURNAL(s);
2947 clear_bit(J_WRITERS_BLOCKED, &journal->j_state);
2948 wake_up(&journal->j_join_wait);
2949 }
2950
2951 /* this must be called without a transaction started */
2952 void reiserfs_wait_on_write_block(struct super_block *s)
2953 {
2954 struct reiserfs_journal *journal = SB_JOURNAL(s);
2955 wait_event(journal->j_join_wait,
2956 !test_bit(J_WRITERS_BLOCKED, &journal->j_state));
2957 }
2958
2959 static void queue_log_writer(struct super_block *s)
2960 {
2961 wait_queue_t wait;
2962 struct reiserfs_journal *journal = SB_JOURNAL(s);
2963 set_bit(J_WRITERS_QUEUED, &journal->j_state);
2964
2965 /*
2966 * we don't want to use wait_event here because
2967 * we only want to wait once.
2968 */
2969 init_waitqueue_entry(&wait, current);
2970 add_wait_queue(&journal->j_join_wait, &wait);
2971 set_current_state(TASK_UNINTERRUPTIBLE);
2972 if (test_bit(J_WRITERS_QUEUED, &journal->j_state)) {
2973 int depth = reiserfs_write_unlock_nested(s);
2974 schedule();
2975 reiserfs_write_lock_nested(s, depth);
2976 }
2977 __set_current_state(TASK_RUNNING);
2978 remove_wait_queue(&journal->j_join_wait, &wait);
2979 }
2980
2981 static void wake_queued_writers(struct super_block *s)
2982 {
2983 struct reiserfs_journal *journal = SB_JOURNAL(s);
2984 if (test_and_clear_bit(J_WRITERS_QUEUED, &journal->j_state))
2985 wake_up(&journal->j_join_wait);
2986 }
2987
2988 static void let_transaction_grow(struct super_block *sb, unsigned int trans_id)
2989 {
2990 struct reiserfs_journal *journal = SB_JOURNAL(sb);
2991 unsigned long bcount = journal->j_bcount;
2992 while (1) {
2993 int depth;
2994
2995 depth = reiserfs_write_unlock_nested(sb);
2996 schedule_timeout_uninterruptible(1);
2997 reiserfs_write_lock_nested(sb, depth);
2998
2999 journal->j_current_jl->j_state |= LIST_COMMIT_PENDING;
3000 while ((atomic_read(&journal->j_wcount) > 0 ||
3001 atomic_read(&journal->j_jlock)) &&
3002 journal->j_trans_id == trans_id) {
3003 queue_log_writer(sb);
3004 }
3005 if (journal->j_trans_id != trans_id)
3006 break;
3007 if (bcount == journal->j_bcount)
3008 break;
3009 bcount = journal->j_bcount;
3010 }
3011 }
3012
3013 /*
3014 * join == true if you must join an existing transaction.
3015 * join == false if you can deal with waiting for others to finish
3016 *
3017 * this will block until the transaction is joinable. send the number of
3018 * blocks you expect to use in nblocks.
3019 */
3020 static int do_journal_begin_r(struct reiserfs_transaction_handle *th,
3021 struct super_block *sb, unsigned long nblocks,
3022 int join)
3023 {
3024 time_t now = get_seconds();
3025 unsigned int old_trans_id;
3026 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3027 struct reiserfs_transaction_handle myth;
3028 int sched_count = 0;
3029 int retval;
3030 int depth;
3031
3032 reiserfs_check_lock_depth(sb, "journal_begin");
3033 BUG_ON(nblocks > journal->j_trans_max);
3034
3035 PROC_INFO_INC(sb, journal.journal_being);
3036 /* set here for journal_join */
3037 th->t_refcount = 1;
3038 th->t_super = sb;
3039
3040 relock:
3041 lock_journal(sb);
3042 if (join != JBEGIN_ABORT && reiserfs_is_journal_aborted(journal)) {
3043 unlock_journal(sb);
3044 retval = journal->j_errno;
3045 goto out_fail;
3046 }
3047 journal->j_bcount++;
3048
3049 if (test_bit(J_WRITERS_BLOCKED, &journal->j_state)) {
3050 unlock_journal(sb);
3051 depth = reiserfs_write_unlock_nested(sb);
3052 reiserfs_wait_on_write_block(sb);
3053 reiserfs_write_lock_nested(sb, depth);
3054 PROC_INFO_INC(sb, journal.journal_relock_writers);
3055 goto relock;
3056 }
3057 now = get_seconds();
3058
3059 /*
3060 * if there is no room in the journal OR
3061 * if this transaction is too old, and we weren't called joinable,
3062 * wait for it to finish before beginning we don't sleep if there
3063 * aren't other writers
3064 */
3065
3066 if ((!join && journal->j_must_wait > 0) ||
3067 (!join
3068 && (journal->j_len_alloc + nblocks + 2) >= journal->j_max_batch)
3069 || (!join && atomic_read(&journal->j_wcount) > 0
3070 && journal->j_trans_start_time > 0
3071 && (now - journal->j_trans_start_time) >
3072 journal->j_max_trans_age) || (!join
3073 && atomic_read(&journal->j_jlock))
3074 || (!join && journal->j_cnode_free < (journal->j_trans_max * 3))) {
3075
3076 old_trans_id = journal->j_trans_id;
3077 /* allow others to finish this transaction */
3078 unlock_journal(sb);
3079
3080 if (!join && (journal->j_len_alloc + nblocks + 2) >=
3081 journal->j_max_batch &&
3082 ((journal->j_len + nblocks + 2) * 100) <
3083 (journal->j_len_alloc * 75)) {
3084 if (atomic_read(&journal->j_wcount) > 10) {
3085 sched_count++;
3086 queue_log_writer(sb);
3087 goto relock;
3088 }
3089 }
3090 /*
3091 * don't mess with joining the transaction if all we
3092 * have to do is wait for someone else to do a commit
3093 */
3094 if (atomic_read(&journal->j_jlock)) {
3095 while (journal->j_trans_id == old_trans_id &&
3096 atomic_read(&journal->j_jlock)) {
3097 queue_log_writer(sb);
3098 }
3099 goto relock;
3100 }
3101 retval = journal_join(&myth, sb);
3102 if (retval)
3103 goto out_fail;
3104
3105 /* someone might have ended the transaction while we joined */
3106 if (old_trans_id != journal->j_trans_id) {
3107 retval = do_journal_end(&myth, 0);
3108 } else {
3109 retval = do_journal_end(&myth, COMMIT_NOW);
3110 }
3111
3112 if (retval)
3113 goto out_fail;
3114
3115 PROC_INFO_INC(sb, journal.journal_relock_wcount);
3116 goto relock;
3117 }
3118 /* we are the first writer, set trans_id */
3119 if (journal->j_trans_start_time == 0) {
3120 journal->j_trans_start_time = get_seconds();
3121 }
3122 atomic_inc(&journal->j_wcount);
3123 journal->j_len_alloc += nblocks;
3124 th->t_blocks_logged = 0;
3125 th->t_blocks_allocated = nblocks;
3126 th->t_trans_id = journal->j_trans_id;
3127 unlock_journal(sb);
3128 INIT_LIST_HEAD(&th->t_list);
3129 return 0;
3130
3131 out_fail:
3132 memset(th, 0, sizeof(*th));
3133 /*
3134 * Re-set th->t_super, so we can properly keep track of how many
3135 * persistent transactions there are. We need to do this so if this
3136 * call is part of a failed restart_transaction, we can free it later
3137 */
3138 th->t_super = sb;
3139 return retval;
3140 }
3141
3142 struct reiserfs_transaction_handle *reiserfs_persistent_transaction(struct
3143 super_block
3144 *s,
3145 int nblocks)
3146 {
3147 int ret;
3148 struct reiserfs_transaction_handle *th;
3149
3150 /*
3151 * if we're nesting into an existing transaction. It will be
3152 * persistent on its own
3153 */
3154 if (reiserfs_transaction_running(s)) {
3155 th = current->journal_info;
3156 th->t_refcount++;
3157 BUG_ON(th->t_refcount < 2);
3158
3159 return th;
3160 }
3161 th = kmalloc(sizeof(struct reiserfs_transaction_handle), GFP_NOFS);
3162 if (!th)
3163 return NULL;
3164 ret = journal_begin(th, s, nblocks);
3165 if (ret) {
3166 kfree(th);
3167 return NULL;
3168 }
3169
3170 SB_JOURNAL(s)->j_persistent_trans++;
3171 return th;
3172 }
3173
3174 int reiserfs_end_persistent_transaction(struct reiserfs_transaction_handle *th)
3175 {
3176 struct super_block *s = th->t_super;
3177 int ret = 0;
3178 if (th->t_trans_id)
3179 ret = journal_end(th);
3180 else
3181 ret = -EIO;
3182 if (th->t_refcount == 0) {
3183 SB_JOURNAL(s)->j_persistent_trans--;
3184 kfree(th);
3185 }
3186 return ret;
3187 }
3188
3189 static int journal_join(struct reiserfs_transaction_handle *th,
3190 struct super_block *sb)
3191 {
3192 struct reiserfs_transaction_handle *cur_th = current->journal_info;
3193
3194 /*
3195 * this keeps do_journal_end from NULLing out the
3196 * current->journal_info pointer
3197 */
3198 th->t_handle_save = cur_th;
3199 BUG_ON(cur_th && cur_th->t_refcount > 1);
3200 return do_journal_begin_r(th, sb, 1, JBEGIN_JOIN);
3201 }
3202
3203 int journal_join_abort(struct reiserfs_transaction_handle *th,
3204 struct super_block *sb)
3205 {
3206 struct reiserfs_transaction_handle *cur_th = current->journal_info;
3207
3208 /*
3209 * this keeps do_journal_end from NULLing out the
3210 * current->journal_info pointer
3211 */
3212 th->t_handle_save = cur_th;
3213 BUG_ON(cur_th && cur_th->t_refcount > 1);
3214 return do_journal_begin_r(th, sb, 1, JBEGIN_ABORT);
3215 }
3216
3217 int journal_begin(struct reiserfs_transaction_handle *th,
3218 struct super_block *sb, unsigned long nblocks)
3219 {
3220 struct reiserfs_transaction_handle *cur_th = current->journal_info;
3221 int ret;
3222
3223 th->t_handle_save = NULL;
3224 if (cur_th) {
3225 /* we are nesting into the current transaction */
3226 if (cur_th->t_super == sb) {
3227 BUG_ON(!cur_th->t_refcount);
3228 cur_th->t_refcount++;
3229 memcpy(th, cur_th, sizeof(*th));
3230 if (th->t_refcount <= 1)
3231 reiserfs_warning(sb, "reiserfs-2005",
3232 "BAD: refcount <= 1, but "
3233 "journal_info != 0");
3234 return 0;
3235 } else {
3236 /*
3237 * we've ended up with a handle from a different
3238 * filesystem. save it and restore on journal_end.
3239 * This should never really happen...
3240 */
3241 reiserfs_warning(sb, "clm-2100",
3242 "nesting info a different FS");
3243 th->t_handle_save = current->journal_info;
3244 current->journal_info = th;
3245 }
3246 } else {
3247 current->journal_info = th;
3248 }
3249 ret = do_journal_begin_r(th, sb, nblocks, JBEGIN_REG);
3250 BUG_ON(current->journal_info != th);
3251
3252 /*
3253 * I guess this boils down to being the reciprocal of clm-2100 above.
3254 * If do_journal_begin_r fails, we need to put it back, since
3255 * journal_end won't be called to do it. */
3256 if (ret)
3257 current->journal_info = th->t_handle_save;
3258 else
3259 BUG_ON(!th->t_refcount);
3260
3261 return ret;
3262 }
3263
3264 /*
3265 * puts bh into the current transaction. If it was already there, reorders
3266 * removes the old pointers from the hash, and puts new ones in (to make
3267 * sure replay happen in the right order).
3268 *
3269 * if it was dirty, cleans and files onto the clean list. I can't let it
3270 * be dirty again until the transaction is committed.
3271 *
3272 * if j_len, is bigger than j_len_alloc, it pushes j_len_alloc to 10 + j_len.
3273 */
3274 int journal_mark_dirty(struct reiserfs_transaction_handle *th,
3275 struct buffer_head *bh)
3276 {
3277 struct super_block *sb = th->t_super;
3278 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3279 struct reiserfs_journal_cnode *cn = NULL;
3280 int count_already_incd = 0;
3281 int prepared = 0;
3282 BUG_ON(!th->t_trans_id);
3283
3284 PROC_INFO_INC(sb, journal.mark_dirty);
3285 if (th->t_trans_id != journal->j_trans_id) {
3286 reiserfs_panic(th->t_super, "journal-1577",
3287 "handle trans id %ld != current trans id %ld",
3288 th->t_trans_id, journal->j_trans_id);
3289 }
3290
3291 prepared = test_clear_buffer_journal_prepared(bh);
3292 clear_buffer_journal_restore_dirty(bh);
3293 /* already in this transaction, we are done */
3294 if (buffer_journaled(bh)) {
3295 PROC_INFO_INC(sb, journal.mark_dirty_already);
3296 return 0;
3297 }
3298
3299 /*
3300 * this must be turned into a panic instead of a warning. We can't
3301 * allow a dirty or journal_dirty or locked buffer to be logged, as
3302 * some changes could get to disk too early. NOT GOOD.
3303 */
3304 if (!prepared || buffer_dirty(bh)) {
3305 reiserfs_warning(sb, "journal-1777",
3306 "buffer %llu bad state "
3307 "%cPREPARED %cLOCKED %cDIRTY %cJDIRTY_WAIT",
3308 (unsigned long long)bh->b_blocknr,
3309 prepared ? ' ' : '!',
3310 buffer_locked(bh) ? ' ' : '!',
3311 buffer_dirty(bh) ? ' ' : '!',
3312 buffer_journal_dirty(bh) ? ' ' : '!');
3313 }
3314
3315 if (atomic_read(&journal->j_wcount) <= 0) {
3316 reiserfs_warning(sb, "journal-1409",
3317 "returning because j_wcount was %d",
3318 atomic_read(&journal->j_wcount));
3319 return 1;
3320 }
3321 /*
3322 * this error means I've screwed up, and we've overflowed
3323 * the transaction. Nothing can be done here, except make the
3324 * FS readonly or panic.
3325 */
3326 if (journal->j_len >= journal->j_trans_max) {
3327 reiserfs_panic(th->t_super, "journal-1413",
3328 "j_len (%lu) is too big",
3329 journal->j_len);
3330 }
3331
3332 if (buffer_journal_dirty(bh)) {
3333 count_already_incd = 1;
3334 PROC_INFO_INC(sb, journal.mark_dirty_notjournal);
3335 clear_buffer_journal_dirty(bh);
3336 }
3337
3338 if (journal->j_len > journal->j_len_alloc) {
3339 journal->j_len_alloc = journal->j_len + JOURNAL_PER_BALANCE_CNT;
3340 }
3341
3342 set_buffer_journaled(bh);
3343
3344 /* now put this guy on the end */
3345 if (!cn) {
3346 cn = get_cnode(sb);
3347 if (!cn) {
3348 reiserfs_panic(sb, "journal-4", "get_cnode failed!");
3349 }
3350
3351 if (th->t_blocks_logged == th->t_blocks_allocated) {
3352 th->t_blocks_allocated += JOURNAL_PER_BALANCE_CNT;
3353 journal->j_len_alloc += JOURNAL_PER_BALANCE_CNT;
3354 }
3355 th->t_blocks_logged++;
3356 journal->j_len++;
3357
3358 cn->bh = bh;
3359 cn->blocknr = bh->b_blocknr;
3360 cn->sb = sb;
3361 cn->jlist = NULL;
3362 insert_journal_hash(journal->j_hash_table, cn);
3363 if (!count_already_incd) {
3364 get_bh(bh);
3365 }
3366 }
3367 cn->next = NULL;
3368 cn->prev = journal->j_last;
3369 cn->bh = bh;
3370 if (journal->j_last) {
3371 journal->j_last->next = cn;
3372 journal->j_last = cn;
3373 } else {
3374 journal->j_first = cn;
3375 journal->j_last = cn;
3376 }
3377 reiserfs_schedule_old_flush(sb);
3378 return 0;
3379 }
3380
3381 int journal_end(struct reiserfs_transaction_handle *th)
3382 {
3383 struct super_block *sb = th->t_super;
3384 if (!current->journal_info && th->t_refcount > 1)
3385 reiserfs_warning(sb, "REISER-NESTING",
3386 "th NULL, refcount %d", th->t_refcount);
3387
3388 if (!th->t_trans_id) {
3389 WARN_ON(1);
3390 return -EIO;
3391 }
3392
3393 th->t_refcount--;
3394 if (th->t_refcount > 0) {
3395 struct reiserfs_transaction_handle *cur_th =
3396 current->journal_info;
3397
3398 /*
3399 * we aren't allowed to close a nested transaction on a
3400 * different filesystem from the one in the task struct
3401 */
3402 BUG_ON(cur_th->t_super != th->t_super);
3403
3404 if (th != cur_th) {
3405 memcpy(current->journal_info, th, sizeof(*th));
3406 th->t_trans_id = 0;
3407 }
3408 return 0;
3409 } else {
3410 return do_journal_end(th, 0);
3411 }
3412 }
3413
3414 /*
3415 * removes from the current transaction, relsing and descrementing any counters.
3416 * also files the removed buffer directly onto the clean list
3417 *
3418 * called by journal_mark_freed when a block has been deleted
3419 *
3420 * returns 1 if it cleaned and relsed the buffer. 0 otherwise
3421 */
3422 static int remove_from_transaction(struct super_block *sb,
3423 b_blocknr_t blocknr, int already_cleaned)
3424 {
3425 struct buffer_head *bh;
3426 struct reiserfs_journal_cnode *cn;
3427 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3428 int ret = 0;
3429
3430 cn = get_journal_hash_dev(sb, journal->j_hash_table, blocknr);
3431 if (!cn || !cn->bh) {
3432 return ret;
3433 }
3434 bh = cn->bh;
3435 if (cn->prev) {
3436 cn->prev->next = cn->next;
3437 }
3438 if (cn->next) {
3439 cn->next->prev = cn->prev;
3440 }
3441 if (cn == journal->j_first) {
3442 journal->j_first = cn->next;
3443 }
3444 if (cn == journal->j_last) {
3445 journal->j_last = cn->prev;
3446 }
3447 if (bh)
3448 remove_journal_hash(sb, journal->j_hash_table, NULL,
3449 bh->b_blocknr, 0);
3450 clear_buffer_journaled(bh); /* don't log this one */
3451
3452 if (!already_cleaned) {
3453 clear_buffer_journal_dirty(bh);
3454 clear_buffer_dirty(bh);
3455 clear_buffer_journal_test(bh);
3456 put_bh(bh);
3457 if (atomic_read(&bh->b_count) < 0) {
3458 reiserfs_warning(sb, "journal-1752",
3459 "b_count < 0");
3460 }
3461 ret = 1;
3462 }
3463 journal->j_len--;
3464 journal->j_len_alloc--;
3465 free_cnode(sb, cn);
3466 return ret;
3467 }
3468
3469 /*
3470 * for any cnode in a journal list, it can only be dirtied of all the
3471 * transactions that include it are committed to disk.
3472 * this checks through each transaction, and returns 1 if you are allowed
3473 * to dirty, and 0 if you aren't
3474 *
3475 * it is called by dirty_journal_list, which is called after
3476 * flush_commit_list has gotten all the log blocks for a given
3477 * transaction on disk
3478 *
3479 */
3480 static int can_dirty(struct reiserfs_journal_cnode *cn)
3481 {
3482 struct super_block *sb = cn->sb;
3483 b_blocknr_t blocknr = cn->blocknr;
3484 struct reiserfs_journal_cnode *cur = cn->hprev;
3485 int can_dirty = 1;
3486
3487 /*
3488 * first test hprev. These are all newer than cn, so any node here
3489 * with the same block number and dev means this node can't be sent
3490 * to disk right now.
3491 */
3492 while (cur && can_dirty) {
3493 if (cur->jlist && cur->bh && cur->blocknr && cur->sb == sb &&
3494 cur->blocknr == blocknr) {
3495 can_dirty = 0;
3496 }
3497 cur = cur->hprev;
3498 }
3499 /*
3500 * then test hnext. These are all older than cn. As long as they
3501 * are committed to the log, it is safe to write cn to disk
3502 */
3503 cur = cn->hnext;
3504 while (cur && can_dirty) {
3505 if (cur->jlist && cur->jlist->j_len > 0 &&
3506 atomic_read(&cur->jlist->j_commit_left) > 0 && cur->bh &&
3507 cur->blocknr && cur->sb == sb && cur->blocknr == blocknr) {
3508 can_dirty = 0;
3509 }
3510 cur = cur->hnext;
3511 }
3512 return can_dirty;
3513 }
3514
3515 /*
3516 * syncs the commit blocks, but does not force the real buffers to disk
3517 * will wait until the current transaction is done/committed before returning
3518 */
3519 int journal_end_sync(struct reiserfs_transaction_handle *th)
3520 {
3521 struct super_block *sb = th->t_super;
3522 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3523
3524 BUG_ON(!th->t_trans_id);
3525 /* you can sync while nested, very, very bad */
3526 BUG_ON(th->t_refcount > 1);
3527 if (journal->j_len == 0) {
3528 reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
3529 1);
3530 journal_mark_dirty(th, SB_BUFFER_WITH_SB(sb));
3531 }
3532 return do_journal_end(th, COMMIT_NOW | WAIT);
3533 }
3534
3535 /* writeback the pending async commits to disk */
3536 static void flush_async_commits(struct work_struct *work)
3537 {
3538 struct reiserfs_journal *journal =
3539 container_of(work, struct reiserfs_journal, j_work.work);
3540 struct super_block *sb = journal->j_work_sb;
3541 struct reiserfs_journal_list *jl;
3542 struct list_head *entry;
3543
3544 reiserfs_write_lock(sb);
3545 if (!list_empty(&journal->j_journal_list)) {
3546 /* last entry is the youngest, commit it and you get everything */
3547 entry = journal->j_journal_list.prev;
3548 jl = JOURNAL_LIST_ENTRY(entry);
3549 flush_commit_list(sb, jl, 1);
3550 }
3551 reiserfs_write_unlock(sb);
3552 }
3553
3554 /*
3555 * flushes any old transactions to disk
3556 * ends the current transaction if it is too old
3557 */
3558 void reiserfs_flush_old_commits(struct super_block *sb)
3559 {
3560 time_t now;
3561 struct reiserfs_transaction_handle th;
3562 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3563
3564 now = get_seconds();
3565 /*
3566 * safety check so we don't flush while we are replaying the log during
3567 * mount
3568 */
3569 if (list_empty(&journal->j_journal_list))
3570 return;
3571
3572 /*
3573 * check the current transaction. If there are no writers, and it is
3574 * too old, finish it, and force the commit blocks to disk
3575 */
3576 if (atomic_read(&journal->j_wcount) <= 0 &&
3577 journal->j_trans_start_time > 0 &&
3578 journal->j_len > 0 &&
3579 (now - journal->j_trans_start_time) > journal->j_max_trans_age) {
3580 if (!journal_join(&th, sb)) {
3581 reiserfs_prepare_for_journal(sb,
3582 SB_BUFFER_WITH_SB(sb),
3583 1);
3584 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(sb));
3585
3586 /*
3587 * we're only being called from kreiserfsd, it makes
3588 * no sense to do an async commit so that kreiserfsd
3589 * can do it later
3590 */
3591 do_journal_end(&th, COMMIT_NOW | WAIT);
3592 }
3593 }
3594 }
3595
3596 /*
3597 * returns 0 if do_journal_end should return right away, returns 1 if
3598 * do_journal_end should finish the commit
3599 *
3600 * if the current transaction is too old, but still has writers, this will
3601 * wait on j_join_wait until all the writers are done. By the time it
3602 * wakes up, the transaction it was called has already ended, so it just
3603 * flushes the commit list and returns 0.
3604 *
3605 * Won't batch when flush or commit_now is set. Also won't batch when
3606 * others are waiting on j_join_wait.
3607 *
3608 * Note, we can't allow the journal_end to proceed while there are still
3609 * writers in the log.
3610 */
3611 static int check_journal_end(struct reiserfs_transaction_handle *th, int flags)
3612 {
3613
3614 time_t now;
3615 int flush = flags & FLUSH_ALL;
3616 int commit_now = flags & COMMIT_NOW;
3617 int wait_on_commit = flags & WAIT;
3618 struct reiserfs_journal_list *jl;
3619 struct super_block *sb = th->t_super;
3620 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3621
3622 BUG_ON(!th->t_trans_id);
3623
3624 if (th->t_trans_id != journal->j_trans_id) {
3625 reiserfs_panic(th->t_super, "journal-1577",
3626 "handle trans id %ld != current trans id %ld",
3627 th->t_trans_id, journal->j_trans_id);
3628 }
3629
3630 journal->j_len_alloc -= (th->t_blocks_allocated - th->t_blocks_logged);
3631 /* <= 0 is allowed. unmounting might not call begin */
3632 if (atomic_read(&journal->j_wcount) > 0)
3633 atomic_dec(&journal->j_wcount);
3634
3635 /*
3636 * BUG, deal with case where j_len is 0, but people previously
3637 * freed blocks need to be released will be dealt with by next
3638 * transaction that actually writes something, but should be taken
3639 * care of in this trans
3640 */
3641 BUG_ON(journal->j_len == 0);
3642
3643 /*
3644 * if wcount > 0, and we are called to with flush or commit_now,
3645 * we wait on j_join_wait. We will wake up when the last writer has
3646 * finished the transaction, and started it on its way to the disk.
3647 * Then, we flush the commit or journal list, and just return 0
3648 * because the rest of journal end was already done for this
3649 * transaction.
3650 */
3651 if (atomic_read(&journal->j_wcount) > 0) {
3652 if (flush || commit_now) {
3653 unsigned trans_id;
3654
3655 jl = journal->j_current_jl;
3656 trans_id = jl->j_trans_id;
3657 if (wait_on_commit)
3658 jl->j_state |= LIST_COMMIT_PENDING;
3659 atomic_set(&journal->j_jlock, 1);
3660 if (flush) {
3661 journal->j_next_full_flush = 1;
3662 }
3663 unlock_journal(sb);
3664
3665 /*
3666 * sleep while the current transaction is
3667 * still j_jlocked
3668 */
3669 while (journal->j_trans_id == trans_id) {
3670 if (atomic_read(&journal->j_jlock)) {
3671 queue_log_writer(sb);
3672 } else {
3673 lock_journal(sb);
3674 if (journal->j_trans_id == trans_id) {
3675 atomic_set(&journal->j_jlock,
3676 1);
3677 }
3678 unlock_journal(sb);
3679 }
3680 }
3681 BUG_ON(journal->j_trans_id == trans_id);
3682
3683 if (commit_now
3684 && journal_list_still_alive(sb, trans_id)
3685 && wait_on_commit) {
3686 flush_commit_list(sb, jl, 1);
3687 }
3688 return 0;
3689 }
3690 unlock_journal(sb);
3691 return 0;
3692 }
3693
3694 /* deal with old transactions where we are the last writers */
3695 now = get_seconds();
3696 if ((now - journal->j_trans_start_time) > journal->j_max_trans_age) {
3697 commit_now = 1;
3698 journal->j_next_async_flush = 1;
3699 }
3700 /* don't batch when someone is waiting on j_join_wait */
3701 /* don't batch when syncing the commit or flushing the whole trans */
3702 if (!(journal->j_must_wait > 0) && !(atomic_read(&journal->j_jlock))
3703 && !flush && !commit_now && (journal->j_len < journal->j_max_batch)
3704 && journal->j_len_alloc < journal->j_max_batch
3705 && journal->j_cnode_free > (journal->j_trans_max * 3)) {
3706 journal->j_bcount++;
3707 unlock_journal(sb);
3708 return 0;
3709 }
3710
3711 if (journal->j_start > SB_ONDISK_JOURNAL_SIZE(sb)) {
3712 reiserfs_panic(sb, "journal-003",
3713 "j_start (%ld) is too high",
3714 journal->j_start);
3715 }
3716 return 1;
3717 }
3718
3719 /*
3720 * Does all the work that makes deleting blocks safe.
3721 * when deleting a block mark BH_JNew, just remove it from the current
3722 * transaction, clean it's buffer_head and move on.
3723 *
3724 * otherwise:
3725 * set a bit for the block in the journal bitmap. That will prevent it from
3726 * being allocated for unformatted nodes before this transaction has finished.
3727 *
3728 * mark any cnodes for this block as BLOCK_FREED, and clear their bh pointers.
3729 * That will prevent any old transactions with this block from trying to flush
3730 * to the real location. Since we aren't removing the cnode from the
3731 * journal_list_hash, *the block can't be reallocated yet.
3732 *
3733 * Then remove it from the current transaction, decrementing any counters and
3734 * filing it on the clean list.
3735 */
3736 int journal_mark_freed(struct reiserfs_transaction_handle *th,
3737 struct super_block *sb, b_blocknr_t blocknr)
3738 {
3739 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3740 struct reiserfs_journal_cnode *cn = NULL;
3741 struct buffer_head *bh = NULL;
3742 struct reiserfs_list_bitmap *jb = NULL;
3743 int cleaned = 0;
3744 BUG_ON(!th->t_trans_id);
3745
3746 cn = get_journal_hash_dev(sb, journal->j_hash_table, blocknr);
3747 if (cn && cn->bh) {
3748 bh = cn->bh;
3749 get_bh(bh);
3750 }
3751 /* if it is journal new, we just remove it from this transaction */
3752 if (bh && buffer_journal_new(bh)) {
3753 clear_buffer_journal_new(bh);
3754 clear_prepared_bits(bh);
3755 reiserfs_clean_and_file_buffer(bh);
3756 cleaned = remove_from_transaction(sb, blocknr, cleaned);
3757 } else {
3758 /*
3759 * set the bit for this block in the journal bitmap
3760 * for this transaction
3761 */
3762 jb = journal->j_current_jl->j_list_bitmap;
3763 if (!jb) {
3764 reiserfs_panic(sb, "journal-1702",
3765 "journal_list_bitmap is NULL");
3766 }
3767 set_bit_in_list_bitmap(sb, blocknr, jb);
3768
3769 /* Note, the entire while loop is not allowed to schedule. */
3770
3771 if (bh) {
3772 clear_prepared_bits(bh);
3773 reiserfs_clean_and_file_buffer(bh);
3774 }
3775 cleaned = remove_from_transaction(sb, blocknr, cleaned);
3776
3777 /*
3778 * find all older transactions with this block,
3779 * make sure they don't try to write it out
3780 */
3781 cn = get_journal_hash_dev(sb, journal->j_list_hash_table,
3782 blocknr);
3783 while (cn) {
3784 if (sb == cn->sb && blocknr == cn->blocknr) {
3785 set_bit(BLOCK_FREED, &cn->state);
3786 if (cn->bh) {
3787 /*
3788 * remove_from_transaction will brelse
3789 * the buffer if it was in the current
3790 * trans
3791 */
3792 if (!cleaned) {
3793 clear_buffer_journal_dirty(cn->
3794 bh);
3795 clear_buffer_dirty(cn->bh);
3796 clear_buffer_journal_test(cn->
3797 bh);
3798 cleaned = 1;
3799 put_bh(cn->bh);
3800 if (atomic_read
3801 (&cn->bh->b_count) < 0) {
3802 reiserfs_warning(sb,
3803 "journal-2138",
3804 "cn->bh->b_count < 0");
3805 }
3806 }
3807 /*
3808 * since we are clearing the bh,
3809 * we MUST dec nonzerolen
3810 */
3811 if (cn->jlist) {
3812 atomic_dec(&cn->jlist->
3813 j_nonzerolen);
3814 }
3815 cn->bh = NULL;
3816 }
3817 }
3818 cn = cn->hnext;
3819 }
3820 }
3821
3822 if (bh)
3823 release_buffer_page(bh); /* get_hash grabs the buffer */
3824 return 0;
3825 }
3826
3827 void reiserfs_update_inode_transaction(struct inode *inode)
3828 {
3829 struct reiserfs_journal *journal = SB_JOURNAL(inode->i_sb);
3830 REISERFS_I(inode)->i_jl = journal->j_current_jl;
3831 REISERFS_I(inode)->i_trans_id = journal->j_trans_id;
3832 }
3833
3834 /*
3835 * returns -1 on error, 0 if no commits/barriers were done and 1
3836 * if a transaction was actually committed and the barrier was done
3837 */
3838 static int __commit_trans_jl(struct inode *inode, unsigned long id,
3839 struct reiserfs_journal_list *jl)
3840 {
3841 struct reiserfs_transaction_handle th;
3842 struct super_block *sb = inode->i_sb;
3843 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3844 int ret = 0;
3845
3846 /*
3847 * is it from the current transaction,
3848 * or from an unknown transaction?
3849 */
3850 if (id == journal->j_trans_id) {
3851 jl = journal->j_current_jl;
3852 /*
3853 * try to let other writers come in and
3854 * grow this transaction
3855 */
3856 let_transaction_grow(sb, id);
3857 if (journal->j_trans_id != id) {
3858 goto flush_commit_only;
3859 }
3860
3861 ret = journal_begin(&th, sb, 1);
3862 if (ret)
3863 return ret;
3864
3865 /* someone might have ended this transaction while we joined */
3866 if (journal->j_trans_id != id) {
3867 reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
3868 1);
3869 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(sb));
3870 ret = journal_end(&th);
3871 goto flush_commit_only;
3872 }
3873
3874 ret = journal_end_sync(&th);
3875 if (!ret)
3876 ret = 1;
3877
3878 } else {
3879 /*
3880 * this gets tricky, we have to make sure the journal list in
3881 * the inode still exists. We know the list is still around
3882 * if we've got a larger transaction id than the oldest list
3883 */
3884 flush_commit_only:
3885 if (journal_list_still_alive(inode->i_sb, id)) {
3886 /*
3887 * we only set ret to 1 when we know for sure
3888 * the barrier hasn't been started yet on the commit
3889 * block.
3890 */
3891 if (atomic_read(&jl->j_commit_left) > 1)
3892 ret = 1;
3893 flush_commit_list(sb, jl, 1);
3894 if (journal->j_errno)
3895 ret = journal->j_errno;
3896 }
3897 }
3898 /* otherwise the list is gone, and long since committed */
3899 return ret;
3900 }
3901
3902 int reiserfs_commit_for_inode(struct inode *inode)
3903 {
3904 unsigned int id = REISERFS_I(inode)->i_trans_id;
3905 struct reiserfs_journal_list *jl = REISERFS_I(inode)->i_jl;
3906
3907 /*
3908 * for the whole inode, assume unset id means it was
3909 * changed in the current transaction. More conservative
3910 */
3911 if (!id || !jl) {
3912 reiserfs_update_inode_transaction(inode);
3913 id = REISERFS_I(inode)->i_trans_id;
3914 /* jl will be updated in __commit_trans_jl */
3915 }
3916
3917 return __commit_trans_jl(inode, id, jl);
3918 }
3919
3920 void reiserfs_restore_prepared_buffer(struct super_block *sb,
3921 struct buffer_head *bh)
3922 {
3923 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3924 PROC_INFO_INC(sb, journal.restore_prepared);
3925 if (!bh) {
3926 return;
3927 }
3928 if (test_clear_buffer_journal_restore_dirty(bh) &&
3929 buffer_journal_dirty(bh)) {
3930 struct reiserfs_journal_cnode *cn;
3931 reiserfs_write_lock(sb);
3932 cn = get_journal_hash_dev(sb,
3933 journal->j_list_hash_table,
3934 bh->b_blocknr);
3935 if (cn && can_dirty(cn)) {
3936 set_buffer_journal_test(bh);
3937 mark_buffer_dirty(bh);
3938 }
3939 reiserfs_write_unlock(sb);
3940 }
3941 clear_buffer_journal_prepared(bh);
3942 }
3943
3944 extern struct tree_balance *cur_tb;
3945 /*
3946 * before we can change a metadata block, we have to make sure it won't
3947 * be written to disk while we are altering it. So, we must:
3948 * clean it
3949 * wait on it.
3950 */
3951 int reiserfs_prepare_for_journal(struct super_block *sb,
3952 struct buffer_head *bh, int wait)
3953 {
3954 PROC_INFO_INC(sb, journal.prepare);
3955
3956 if (!trylock_buffer(bh)) {
3957 if (!wait)
3958 return 0;
3959 lock_buffer(bh);
3960 }
3961 set_buffer_journal_prepared(bh);
3962 if (test_clear_buffer_dirty(bh) && buffer_journal_dirty(bh)) {
3963 clear_buffer_journal_test(bh);
3964 set_buffer_journal_restore_dirty(bh);
3965 }
3966 unlock_buffer(bh);
3967 return 1;
3968 }
3969
3970 /*
3971 * long and ugly. If flush, will not return until all commit
3972 * blocks and all real buffers in the trans are on disk.
3973 * If no_async, won't return until all commit blocks are on disk.
3974 *
3975 * keep reading, there are comments as you go along
3976 *
3977 * If the journal is aborted, we just clean up. Things like flushing
3978 * journal lists, etc just won't happen.
3979 */
3980 static int do_journal_end(struct reiserfs_transaction_handle *th, int flags)
3981 {
3982 struct super_block *sb = th->t_super;
3983 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3984 struct reiserfs_journal_cnode *cn, *next, *jl_cn;
3985 struct reiserfs_journal_cnode *last_cn = NULL;
3986 struct reiserfs_journal_desc *desc;
3987 struct reiserfs_journal_commit *commit;
3988 struct buffer_head *c_bh; /* commit bh */
3989 struct buffer_head *d_bh; /* desc bh */
3990 int cur_write_start = 0; /* start index of current log write */
3991 int old_start;
3992 int i;
3993 int flush;
3994 int wait_on_commit;
3995 struct reiserfs_journal_list *jl, *temp_jl;
3996 struct list_head *entry, *safe;
3997 unsigned long jindex;
3998 unsigned int commit_trans_id;
3999 int trans_half;
4000 int depth;
4001
4002 BUG_ON(th->t_refcount > 1);
4003 BUG_ON(!th->t_trans_id);
4004 BUG_ON(!th->t_super);
4005
4006 /*
4007 * protect flush_older_commits from doing mistakes if the
4008 * transaction ID counter gets overflowed.
4009 */
4010 if (th->t_trans_id == ~0U)
4011 flags |= FLUSH_ALL | COMMIT_NOW | WAIT;
4012 flush = flags & FLUSH_ALL;
4013 wait_on_commit = flags & WAIT;
4014
4015 current->journal_info = th->t_handle_save;
4016 reiserfs_check_lock_depth(sb, "journal end");
4017 if (journal->j_len == 0) {
4018 reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
4019 1);
4020 journal_mark_dirty(th, SB_BUFFER_WITH_SB(sb));
4021 }
4022
4023 lock_journal(sb);
4024 if (journal->j_next_full_flush) {
4025 flags |= FLUSH_ALL;
4026 flush = 1;
4027 }
4028 if (journal->j_next_async_flush) {
4029 flags |= COMMIT_NOW | WAIT;
4030 wait_on_commit = 1;
4031 }
4032
4033 /*
4034 * check_journal_end locks the journal, and unlocks if it does
4035 * not return 1 it tells us if we should continue with the
4036 * journal_end, or just return
4037 */
4038 if (!check_journal_end(th, flags)) {
4039 reiserfs_schedule_old_flush(sb);
4040 wake_queued_writers(sb);
4041 reiserfs_async_progress_wait(sb);
4042 goto out;
4043 }
4044
4045 /* check_journal_end might set these, check again */
4046 if (journal->j_next_full_flush) {
4047 flush = 1;
4048 }
4049
4050 /*
4051 * j must wait means we have to flush the log blocks, and the
4052 * real blocks for this transaction
4053 */
4054 if (journal->j_must_wait > 0) {
4055 flush = 1;
4056 }
4057 #ifdef REISERFS_PREALLOCATE
4058 /*
4059 * quota ops might need to nest, setup the journal_info pointer
4060 * for them and raise the refcount so that it is > 0.
4061 */
4062 current->journal_info = th;
4063 th->t_refcount++;
4064
4065 /* it should not involve new blocks into the transaction */
4066 reiserfs_discard_all_prealloc(th);
4067
4068 th->t_refcount--;
4069 current->journal_info = th->t_handle_save;
4070 #endif
4071
4072 /* setup description block */
4073 d_bh =
4074 journal_getblk(sb,
4075 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
4076 journal->j_start);
4077 set_buffer_uptodate(d_bh);
4078 desc = (struct reiserfs_journal_desc *)(d_bh)->b_data;
4079 memset(d_bh->b_data, 0, d_bh->b_size);
4080 memcpy(get_journal_desc_magic(d_bh), JOURNAL_DESC_MAGIC, 8);
4081 set_desc_trans_id(desc, journal->j_trans_id);
4082
4083 /*
4084 * setup commit block. Don't write (keep it clean too) this one
4085 * until after everyone else is written
4086 */
4087 c_bh = journal_getblk(sb, SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
4088 ((journal->j_start + journal->j_len +
4089 1) % SB_ONDISK_JOURNAL_SIZE(sb)));
4090 commit = (struct reiserfs_journal_commit *)c_bh->b_data;
4091 memset(c_bh->b_data, 0, c_bh->b_size);
4092 set_commit_trans_id(commit, journal->j_trans_id);
4093 set_buffer_uptodate(c_bh);
4094
4095 /* init this journal list */
4096 jl = journal->j_current_jl;
4097
4098 /*
4099 * we lock the commit before doing anything because
4100 * we want to make sure nobody tries to run flush_commit_list until
4101 * the new transaction is fully setup, and we've already flushed the
4102 * ordered bh list
4103 */
4104 reiserfs_mutex_lock_safe(&jl->j_commit_mutex, sb);
4105
4106 /* save the transaction id in case we need to commit it later */
4107 commit_trans_id = jl->j_trans_id;
4108
4109 atomic_set(&jl->j_older_commits_done, 0);
4110 jl->j_trans_id = journal->j_trans_id;
4111 jl->j_timestamp = journal->j_trans_start_time;
4112 jl->j_commit_bh = c_bh;
4113 jl->j_start = journal->j_start;
4114 jl->j_len = journal->j_len;
4115 atomic_set(&jl->j_nonzerolen, journal->j_len);
4116 atomic_set(&jl->j_commit_left, journal->j_len + 2);
4117 jl->j_realblock = NULL;
4118
4119 /*
4120 * The ENTIRE FOR LOOP MUST not cause schedule to occur.
4121 * for each real block, add it to the journal list hash,
4122 * copy into real block index array in the commit or desc block
4123 */
4124 trans_half = journal_trans_half(sb->s_blocksize);
4125 for (i = 0, cn = journal->j_first; cn; cn = cn->next, i++) {
4126 if (buffer_journaled(cn->bh)) {
4127 jl_cn = get_cnode(sb);
4128 if (!jl_cn) {
4129 reiserfs_panic(sb, "journal-1676",
4130 "get_cnode returned NULL");
4131 }
4132 if (i == 0) {
4133 jl->j_realblock = jl_cn;
4134 }
4135 jl_cn->prev = last_cn;
4136 jl_cn->next = NULL;
4137 if (last_cn) {
4138 last_cn->next = jl_cn;
4139 }
4140 last_cn = jl_cn;
4141 /*
4142 * make sure the block we are trying to log
4143 * is not a block of journal or reserved area
4144 */
4145 if (is_block_in_log_or_reserved_area
4146 (sb, cn->bh->b_blocknr)) {
4147 reiserfs_panic(sb, "journal-2332",
4148 "Trying to log block %lu, "
4149 "which is a log block",
4150 cn->bh->b_blocknr);
4151 }
4152 jl_cn->blocknr = cn->bh->b_blocknr;
4153 jl_cn->state = 0;
4154 jl_cn->sb = sb;
4155 jl_cn->bh = cn->bh;
4156 jl_cn->jlist = jl;
4157 insert_journal_hash(journal->j_list_hash_table, jl_cn);
4158 if (i < trans_half) {
4159 desc->j_realblock[i] =
4160 cpu_to_le32(cn->bh->b_blocknr);
4161 } else {
4162 commit->j_realblock[i - trans_half] =
4163 cpu_to_le32(cn->bh->b_blocknr);
4164 }
4165 } else {
4166 i--;
4167 }
4168 }
4169 set_desc_trans_len(desc, journal->j_len);
4170 set_desc_mount_id(desc, journal->j_mount_id);
4171 set_desc_trans_id(desc, journal->j_trans_id);
4172 set_commit_trans_len(commit, journal->j_len);
4173
4174 /*
4175 * special check in case all buffers in the journal
4176 * were marked for not logging
4177 */
4178 BUG_ON(journal->j_len == 0);
4179
4180 /*
4181 * we're about to dirty all the log blocks, mark the description block
4182 * dirty now too. Don't mark the commit block dirty until all the
4183 * others are on disk
4184 */
4185 mark_buffer_dirty(d_bh);
4186
4187 /*
4188 * first data block is j_start + 1, so add one to
4189 * cur_write_start wherever you use it
4190 */
4191 cur_write_start = journal->j_start;
4192 cn = journal->j_first;
4193 jindex = 1; /* start at one so we don't get the desc again */
4194 while (cn) {
4195 clear_buffer_journal_new(cn->bh);
4196 /* copy all the real blocks into log area. dirty log blocks */
4197 if (buffer_journaled(cn->bh)) {
4198 struct buffer_head *tmp_bh;
4199 char *addr;
4200 struct page *page;
4201 tmp_bh =
4202 journal_getblk(sb,
4203 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
4204 ((cur_write_start +
4205 jindex) %
4206 SB_ONDISK_JOURNAL_SIZE(sb)));
4207 set_buffer_uptodate(tmp_bh);
4208 page = cn->bh->b_page;
4209 addr = kmap(page);
4210 memcpy(tmp_bh->b_data,
4211 addr + offset_in_page(cn->bh->b_data),
4212 cn->bh->b_size);
4213 kunmap(page);
4214 mark_buffer_dirty(tmp_bh);
4215 jindex++;
4216 set_buffer_journal_dirty(cn->bh);
4217 clear_buffer_journaled(cn->bh);
4218 } else {
4219 /*
4220 * JDirty cleared sometime during transaction.
4221 * don't log this one
4222 */
4223 reiserfs_warning(sb, "journal-2048",
4224 "BAD, buffer in journal hash, "
4225 "but not JDirty!");
4226 brelse(cn->bh);
4227 }
4228 next = cn->next;
4229 free_cnode(sb, cn);
4230 cn = next;
4231 reiserfs_cond_resched(sb);
4232 }
4233
4234 /*
4235 * we are done with both the c_bh and d_bh, but
4236 * c_bh must be written after all other commit blocks,
4237 * so we dirty/relse c_bh in flush_commit_list, with commit_left <= 1.
4238 */
4239
4240 journal->j_current_jl = alloc_journal_list(sb);
4241
4242 /* now it is safe to insert this transaction on the main list */
4243 list_add_tail(&jl->j_list, &journal->j_journal_list);
4244 list_add_tail(&jl->j_working_list, &journal->j_working_list);
4245 journal->j_num_work_lists++;
4246
4247 /* reset journal values for the next transaction */
4248 old_start = journal->j_start;
4249 journal->j_start =
4250 (journal->j_start + journal->j_len +
4251 2) % SB_ONDISK_JOURNAL_SIZE(sb);
4252 atomic_set(&journal->j_wcount, 0);
4253 journal->j_bcount = 0;
4254 journal->j_last = NULL;
4255 journal->j_first = NULL;
4256 journal->j_len = 0;
4257 journal->j_trans_start_time = 0;
4258 /* check for trans_id overflow */
4259 if (++journal->j_trans_id == 0)
4260 journal->j_trans_id = 10;
4261 journal->j_current_jl->j_trans_id = journal->j_trans_id;
4262 journal->j_must_wait = 0;
4263 journal->j_len_alloc = 0;
4264 journal->j_next_full_flush = 0;
4265 journal->j_next_async_flush = 0;
4266 init_journal_hash(sb);
4267
4268 /*
4269 * make sure reiserfs_add_jh sees the new current_jl before we
4270 * write out the tails
4271 */
4272 smp_mb();
4273
4274 /*
4275 * tail conversion targets have to hit the disk before we end the
4276 * transaction. Otherwise a later transaction might repack the tail
4277 * before this transaction commits, leaving the data block unflushed
4278 * and clean, if we crash before the later transaction commits, the
4279 * data block is lost.
4280 */
4281 if (!list_empty(&jl->j_tail_bh_list)) {
4282 depth = reiserfs_write_unlock_nested(sb);
4283 write_ordered_buffers(&journal->j_dirty_buffers_lock,
4284 journal, jl, &jl->j_tail_bh_list);
4285 reiserfs_write_lock_nested(sb, depth);
4286 }
4287 BUG_ON(!list_empty(&jl->j_tail_bh_list));
4288 mutex_unlock(&jl->j_commit_mutex);
4289
4290 /*
4291 * honor the flush wishes from the caller, simple commits can
4292 * be done outside the journal lock, they are done below
4293 *
4294 * if we don't flush the commit list right now, we put it into
4295 * the work queue so the people waiting on the async progress work
4296 * queue don't wait for this proc to flush journal lists and such.
4297 */
4298 if (flush) {
4299 flush_commit_list(sb, jl, 1);
4300 flush_journal_list(sb, jl, 1);
4301 } else if (!(jl->j_state & LIST_COMMIT_PENDING)) {
4302 /*
4303 * Avoid queueing work when sb is being shut down. Transaction
4304 * will be flushed on journal shutdown.
4305 */
4306 if (sb->s_flags & MS_ACTIVE)
4307 queue_delayed_work(REISERFS_SB(sb)->commit_wq,
4308 &journal->j_work, HZ / 10);
4309 }
4310
4311 /*
4312 * if the next transaction has any chance of wrapping, flush
4313 * transactions that might get overwritten. If any journal lists
4314 * are very old flush them as well.
4315 */
4316 first_jl:
4317 list_for_each_safe(entry, safe, &journal->j_journal_list) {
4318 temp_jl = JOURNAL_LIST_ENTRY(entry);
4319 if (journal->j_start <= temp_jl->j_start) {
4320 if ((journal->j_start + journal->j_trans_max + 1) >=
4321 temp_jl->j_start) {
4322 flush_used_journal_lists(sb, temp_jl);
4323 goto first_jl;
4324 } else if ((journal->j_start +
4325 journal->j_trans_max + 1) <
4326 SB_ONDISK_JOURNAL_SIZE(sb)) {
4327 /*
4328 * if we don't cross into the next
4329 * transaction and we don't wrap, there is
4330 * no way we can overlap any later transactions
4331 * break now
4332 */
4333 break;
4334 }
4335 } else if ((journal->j_start +
4336 journal->j_trans_max + 1) >
4337 SB_ONDISK_JOURNAL_SIZE(sb)) {
4338 if (((journal->j_start + journal->j_trans_max + 1) %
4339 SB_ONDISK_JOURNAL_SIZE(sb)) >=
4340 temp_jl->j_start) {
4341 flush_used_journal_lists(sb, temp_jl);
4342 goto first_jl;
4343 } else {
4344 /*
4345 * we don't overlap anything from out start
4346 * to the end of the log, and our wrapped
4347 * portion doesn't overlap anything at
4348 * the start of the log. We can break
4349 */
4350 break;
4351 }
4352 }
4353 }
4354
4355 journal->j_current_jl->j_list_bitmap =
4356 get_list_bitmap(sb, journal->j_current_jl);
4357
4358 if (!(journal->j_current_jl->j_list_bitmap)) {
4359 reiserfs_panic(sb, "journal-1996",
4360 "could not get a list bitmap");
4361 }
4362
4363 atomic_set(&journal->j_jlock, 0);
4364 unlock_journal(sb);
4365 /* wake up any body waiting to join. */
4366 clear_bit(J_WRITERS_QUEUED, &journal->j_state);
4367 wake_up(&journal->j_join_wait);
4368
4369 if (!flush && wait_on_commit &&
4370 journal_list_still_alive(sb, commit_trans_id)) {
4371 flush_commit_list(sb, jl, 1);
4372 }
4373 out:
4374 reiserfs_check_lock_depth(sb, "journal end2");
4375
4376 memset(th, 0, sizeof(*th));
4377 /*
4378 * Re-set th->t_super, so we can properly keep track of how many
4379 * persistent transactions there are. We need to do this so if this
4380 * call is part of a failed restart_transaction, we can free it later
4381 */
4382 th->t_super = sb;
4383
4384 return journal->j_errno;
4385 }
4386
4387 /* Send the file system read only and refuse new transactions */
4388 void reiserfs_abort_journal(struct super_block *sb, int errno)
4389 {
4390 struct reiserfs_journal *journal = SB_JOURNAL(sb);
4391 if (test_bit(J_ABORTED, &journal->j_state))
4392 return;
4393
4394 if (!journal->j_errno)
4395 journal->j_errno = errno;
4396
4397 sb->s_flags |= MS_RDONLY;
4398 set_bit(J_ABORTED, &journal->j_state);
4399
4400 #ifdef CONFIG_REISERFS_CHECK
4401 dump_stack();
4402 #endif
4403 }
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