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1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Write ahead logging implementation copyright Chris Mason 2000
4 *
5 * The background commits make this code very interrelated, and
6 * overly complex. I need to rethink things a bit....The major players:
7 *
8 * journal_begin -- call with the number of blocks you expect to log.
9 * If the current transaction is too
10 * old, it will block until the current transaction is
11 * finished, and then start a new one.
12 * Usually, your transaction will get joined in with
13 * previous ones for speed.
14 *
15 * journal_join -- same as journal_begin, but won't block on the current
16 * transaction regardless of age. Don't ever call
17 * this. Ever. There are only two places it should be
18 * called from, and they are both inside this file.
19 *
20 * journal_mark_dirty -- adds blocks into this transaction. clears any flags
21 * that might make them get sent to disk
22 * and then marks them BH_JDirty. Puts the buffer head
23 * into the current transaction hash.
24 *
25 * journal_end -- if the current transaction is batchable, it does nothing
26 * otherwise, it could do an async/synchronous commit, or
27 * a full flush of all log and real blocks in the
28 * transaction.
29 *
30 * flush_old_commits -- if the current transaction is too old, it is ended and
31 * commit blocks are sent to disk. Forces commit blocks
32 * to disk for all backgrounded commits that have been
33 * around too long.
34 * -- Note, if you call this as an immediate flush from
35 * from within kupdate, it will ignore the immediate flag
36 */
37
38 #include <linux/time.h>
39 #include <linux/semaphore.h>
40 #include <linux/vmalloc.h>
41 #include "reiserfs.h"
42 #include <linux/kernel.h>
43 #include <linux/errno.h>
44 #include <linux/fcntl.h>
45 #include <linux/stat.h>
46 #include <linux/string.h>
47 #include <linux/buffer_head.h>
48 #include <linux/workqueue.h>
49 #include <linux/writeback.h>
50 #include <linux/blkdev.h>
51 #include <linux/backing-dev.h>
52 #include <linux/uaccess.h>
53 #include <linux/slab.h>
54
55
56 /* gets a struct reiserfs_journal_list * from a list head */
57 #define JOURNAL_LIST_ENTRY(h) (list_entry((h), struct reiserfs_journal_list, \
58 j_list))
59 #define JOURNAL_WORK_ENTRY(h) (list_entry((h), struct reiserfs_journal_list, \
60 j_working_list))
61
62 /* must be correct to keep the desc and commit structs at 4k */
63 #define JOURNAL_TRANS_HALF 1018
64 #define BUFNR 64 /*read ahead */
65
66 /* cnode stat bits. Move these into reiserfs_fs.h */
67
68 /* this block was freed, and can't be written. */
69 #define BLOCK_FREED 2
70 /* this block was freed during this transaction, and can't be written */
71 #define BLOCK_FREED_HOLDER 3
72
73 /* used in flush_journal_list */
74 #define BLOCK_NEEDS_FLUSH 4
75 #define BLOCK_DIRTIED 5
76
77 /* journal list state bits */
78 #define LIST_TOUCHED 1
79 #define LIST_DIRTY 2
80 #define LIST_COMMIT_PENDING 4 /* someone will commit this list */
81
82 /* flags for do_journal_end */
83 #define FLUSH_ALL 1 /* flush commit and real blocks */
84 #define COMMIT_NOW 2 /* end and commit this transaction */
85 #define WAIT 4 /* wait for the log blocks to hit the disk */
86
87 static int do_journal_end(struct reiserfs_transaction_handle *, int flags);
88 static int flush_journal_list(struct super_block *s,
89 struct reiserfs_journal_list *jl, int flushall);
90 static int flush_commit_list(struct super_block *s,
91 struct reiserfs_journal_list *jl, int flushall);
92 static int can_dirty(struct reiserfs_journal_cnode *cn);
93 static int journal_join(struct reiserfs_transaction_handle *th,
94 struct super_block *sb);
95 static void release_journal_dev(struct super_block *super,
96 struct reiserfs_journal *journal);
97 static int dirty_one_transaction(struct super_block *s,
98 struct reiserfs_journal_list *jl);
99 static void flush_async_commits(struct work_struct *work);
100 static void queue_log_writer(struct super_block *s);
101
102 /* values for join in do_journal_begin_r */
103 enum {
104 JBEGIN_REG = 0, /* regular journal begin */
105 /* join the running transaction if at all possible */
106 JBEGIN_JOIN = 1,
107 /* called from cleanup code, ignores aborted flag */
108 JBEGIN_ABORT = 2,
109 };
110
111 static int do_journal_begin_r(struct reiserfs_transaction_handle *th,
112 struct super_block *sb,
113 unsigned long nblocks, int join);
114
115 static void init_journal_hash(struct super_block *sb)
116 {
117 struct reiserfs_journal *journal = SB_JOURNAL(sb);
118 memset(journal->j_hash_table, 0,
119 JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *));
120 }
121
122 /*
123 * clears BH_Dirty and sticks the buffer on the clean list. Called because
124 * I can't allow refile_buffer to make schedule happen after I've freed a
125 * block. Look at remove_from_transaction and journal_mark_freed for
126 * more details.
127 */
128 static int reiserfs_clean_and_file_buffer(struct buffer_head *bh)
129 {
130 if (bh) {
131 clear_buffer_dirty(bh);
132 clear_buffer_journal_test(bh);
133 }
134 return 0;
135 }
136
137 static struct reiserfs_bitmap_node *allocate_bitmap_node(struct super_block
138 *sb)
139 {
140 struct reiserfs_bitmap_node *bn;
141 static int id;
142
143 bn = kmalloc(sizeof(struct reiserfs_bitmap_node), GFP_NOFS);
144 if (!bn) {
145 return NULL;
146 }
147 bn->data = kzalloc(sb->s_blocksize, GFP_NOFS);
148 if (!bn->data) {
149 kfree(bn);
150 return NULL;
151 }
152 bn->id = id++;
153 INIT_LIST_HEAD(&bn->list);
154 return bn;
155 }
156
157 static struct reiserfs_bitmap_node *get_bitmap_node(struct super_block *sb)
158 {
159 struct reiserfs_journal *journal = SB_JOURNAL(sb);
160 struct reiserfs_bitmap_node *bn = NULL;
161 struct list_head *entry = journal->j_bitmap_nodes.next;
162
163 journal->j_used_bitmap_nodes++;
164 repeat:
165
166 if (entry != &journal->j_bitmap_nodes) {
167 bn = list_entry(entry, struct reiserfs_bitmap_node, list);
168 list_del(entry);
169 memset(bn->data, 0, sb->s_blocksize);
170 journal->j_free_bitmap_nodes--;
171 return bn;
172 }
173 bn = allocate_bitmap_node(sb);
174 if (!bn) {
175 yield();
176 goto repeat;
177 }
178 return bn;
179 }
180 static inline void free_bitmap_node(struct super_block *sb,
181 struct reiserfs_bitmap_node *bn)
182 {
183 struct reiserfs_journal *journal = SB_JOURNAL(sb);
184 journal->j_used_bitmap_nodes--;
185 if (journal->j_free_bitmap_nodes > REISERFS_MAX_BITMAP_NODES) {
186 kfree(bn->data);
187 kfree(bn);
188 } else {
189 list_add(&bn->list, &journal->j_bitmap_nodes);
190 journal->j_free_bitmap_nodes++;
191 }
192 }
193
194 static void allocate_bitmap_nodes(struct super_block *sb)
195 {
196 int i;
197 struct reiserfs_journal *journal = SB_JOURNAL(sb);
198 struct reiserfs_bitmap_node *bn = NULL;
199 for (i = 0; i < REISERFS_MIN_BITMAP_NODES; i++) {
200 bn = allocate_bitmap_node(sb);
201 if (bn) {
202 list_add(&bn->list, &journal->j_bitmap_nodes);
203 journal->j_free_bitmap_nodes++;
204 } else {
205 /* this is ok, we'll try again when more are needed */
206 break;
207 }
208 }
209 }
210
211 static int set_bit_in_list_bitmap(struct super_block *sb,
212 b_blocknr_t block,
213 struct reiserfs_list_bitmap *jb)
214 {
215 unsigned int bmap_nr = block / (sb->s_blocksize << 3);
216 unsigned int bit_nr = block % (sb->s_blocksize << 3);
217
218 if (!jb->bitmaps[bmap_nr]) {
219 jb->bitmaps[bmap_nr] = get_bitmap_node(sb);
220 }
221 set_bit(bit_nr, (unsigned long *)jb->bitmaps[bmap_nr]->data);
222 return 0;
223 }
224
225 static void cleanup_bitmap_list(struct super_block *sb,
226 struct reiserfs_list_bitmap *jb)
227 {
228 int i;
229 if (jb->bitmaps == NULL)
230 return;
231
232 for (i = 0; i < reiserfs_bmap_count(sb); i++) {
233 if (jb->bitmaps[i]) {
234 free_bitmap_node(sb, jb->bitmaps[i]);
235 jb->bitmaps[i] = NULL;
236 }
237 }
238 }
239
240 /*
241 * only call this on FS unmount.
242 */
243 static int free_list_bitmaps(struct super_block *sb,
244 struct reiserfs_list_bitmap *jb_array)
245 {
246 int i;
247 struct reiserfs_list_bitmap *jb;
248 for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
249 jb = jb_array + i;
250 jb->journal_list = NULL;
251 cleanup_bitmap_list(sb, jb);
252 vfree(jb->bitmaps);
253 jb->bitmaps = NULL;
254 }
255 return 0;
256 }
257
258 static int free_bitmap_nodes(struct super_block *sb)
259 {
260 struct reiserfs_journal *journal = SB_JOURNAL(sb);
261 struct list_head *next = journal->j_bitmap_nodes.next;
262 struct reiserfs_bitmap_node *bn;
263
264 while (next != &journal->j_bitmap_nodes) {
265 bn = list_entry(next, struct reiserfs_bitmap_node, list);
266 list_del(next);
267 kfree(bn->data);
268 kfree(bn);
269 next = journal->j_bitmap_nodes.next;
270 journal->j_free_bitmap_nodes--;
271 }
272
273 return 0;
274 }
275
276 /*
277 * get memory for JOURNAL_NUM_BITMAPS worth of bitmaps.
278 * jb_array is the array to be filled in.
279 */
280 int reiserfs_allocate_list_bitmaps(struct super_block *sb,
281 struct reiserfs_list_bitmap *jb_array,
282 unsigned int bmap_nr)
283 {
284 int i;
285 int failed = 0;
286 struct reiserfs_list_bitmap *jb;
287 int mem = bmap_nr * sizeof(struct reiserfs_bitmap_node *);
288
289 for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
290 jb = jb_array + i;
291 jb->journal_list = NULL;
292 jb->bitmaps = vzalloc(mem);
293 if (!jb->bitmaps) {
294 reiserfs_warning(sb, "clm-2000", "unable to "
295 "allocate bitmaps for journal lists");
296 failed = 1;
297 break;
298 }
299 }
300 if (failed) {
301 free_list_bitmaps(sb, jb_array);
302 return -1;
303 }
304 return 0;
305 }
306
307 /*
308 * find an available list bitmap. If you can't find one, flush a commit list
309 * and try again
310 */
311 static struct reiserfs_list_bitmap *get_list_bitmap(struct super_block *sb,
312 struct reiserfs_journal_list
313 *jl)
314 {
315 int i, j;
316 struct reiserfs_journal *journal = SB_JOURNAL(sb);
317 struct reiserfs_list_bitmap *jb = NULL;
318
319 for (j = 0; j < (JOURNAL_NUM_BITMAPS * 3); j++) {
320 i = journal->j_list_bitmap_index;
321 journal->j_list_bitmap_index = (i + 1) % JOURNAL_NUM_BITMAPS;
322 jb = journal->j_list_bitmap + i;
323 if (journal->j_list_bitmap[i].journal_list) {
324 flush_commit_list(sb,
325 journal->j_list_bitmap[i].
326 journal_list, 1);
327 if (!journal->j_list_bitmap[i].journal_list) {
328 break;
329 }
330 } else {
331 break;
332 }
333 }
334 /* double check to make sure if flushed correctly */
335 if (jb->journal_list)
336 return NULL;
337 jb->journal_list = jl;
338 return jb;
339 }
340
341 /*
342 * allocates a new chunk of X nodes, and links them all together as a list.
343 * Uses the cnode->next and cnode->prev pointers
344 * returns NULL on failure
345 */
346 static struct reiserfs_journal_cnode *allocate_cnodes(int num_cnodes)
347 {
348 struct reiserfs_journal_cnode *head;
349 int i;
350 if (num_cnodes <= 0) {
351 return NULL;
352 }
353 head = vzalloc(num_cnodes * sizeof(struct reiserfs_journal_cnode));
354 if (!head) {
355 return NULL;
356 }
357 head[0].prev = NULL;
358 head[0].next = head + 1;
359 for (i = 1; i < num_cnodes; i++) {
360 head[i].prev = head + (i - 1);
361 head[i].next = head + (i + 1); /* if last one, overwrite it after the if */
362 }
363 head[num_cnodes - 1].next = NULL;
364 return head;
365 }
366
367 /* pulls a cnode off the free list, or returns NULL on failure */
368 static struct reiserfs_journal_cnode *get_cnode(struct super_block *sb)
369 {
370 struct reiserfs_journal_cnode *cn;
371 struct reiserfs_journal *journal = SB_JOURNAL(sb);
372
373 reiserfs_check_lock_depth(sb, "get_cnode");
374
375 if (journal->j_cnode_free <= 0) {
376 return NULL;
377 }
378 journal->j_cnode_used++;
379 journal->j_cnode_free--;
380 cn = journal->j_cnode_free_list;
381 if (!cn) {
382 return cn;
383 }
384 if (cn->next) {
385 cn->next->prev = NULL;
386 }
387 journal->j_cnode_free_list = cn->next;
388 memset(cn, 0, sizeof(struct reiserfs_journal_cnode));
389 return cn;
390 }
391
392 /*
393 * returns a cnode to the free list
394 */
395 static void free_cnode(struct super_block *sb,
396 struct reiserfs_journal_cnode *cn)
397 {
398 struct reiserfs_journal *journal = SB_JOURNAL(sb);
399
400 reiserfs_check_lock_depth(sb, "free_cnode");
401
402 journal->j_cnode_used--;
403 journal->j_cnode_free++;
404 /* memset(cn, 0, sizeof(struct reiserfs_journal_cnode)) ; */
405 cn->next = journal->j_cnode_free_list;
406 if (journal->j_cnode_free_list) {
407 journal->j_cnode_free_list->prev = cn;
408 }
409 cn->prev = NULL; /* not needed with the memset, but I might kill the memset, and forget to do this */
410 journal->j_cnode_free_list = cn;
411 }
412
413 static void clear_prepared_bits(struct buffer_head *bh)
414 {
415 clear_buffer_journal_prepared(bh);
416 clear_buffer_journal_restore_dirty(bh);
417 }
418
419 /*
420 * return a cnode with same dev, block number and size in table,
421 * or null if not found
422 */
423 static inline struct reiserfs_journal_cnode *get_journal_hash_dev(struct
424 super_block
425 *sb,
426 struct
427 reiserfs_journal_cnode
428 **table,
429 long bl)
430 {
431 struct reiserfs_journal_cnode *cn;
432 cn = journal_hash(table, sb, bl);
433 while (cn) {
434 if (cn->blocknr == bl && cn->sb == sb)
435 return cn;
436 cn = cn->hnext;
437 }
438 return (struct reiserfs_journal_cnode *)0;
439 }
440
441 /*
442 * this actually means 'can this block be reallocated yet?'. If you set
443 * search_all, a block can only be allocated if it is not in the current
444 * transaction, was not freed by the current transaction, and has no chance
445 * of ever being overwritten by a replay after crashing.
446 *
447 * If you don't set search_all, a block can only be allocated if it is not
448 * in the current transaction. Since deleting a block removes it from the
449 * current transaction, this case should never happen. If you don't set
450 * search_all, make sure you never write the block without logging it.
451 *
452 * next_zero_bit is a suggestion about the next block to try for find_forward.
453 * when bl is rejected because it is set in a journal list bitmap, we search
454 * for the next zero bit in the bitmap that rejected bl. Then, we return
455 * that through next_zero_bit for find_forward to try.
456 *
457 * Just because we return something in next_zero_bit does not mean we won't
458 * reject it on the next call to reiserfs_in_journal
459 */
460 int reiserfs_in_journal(struct super_block *sb,
461 unsigned int bmap_nr, int bit_nr, int search_all,
462 b_blocknr_t * next_zero_bit)
463 {
464 struct reiserfs_journal *journal = SB_JOURNAL(sb);
465 struct reiserfs_journal_cnode *cn;
466 struct reiserfs_list_bitmap *jb;
467 int i;
468 unsigned long bl;
469
470 *next_zero_bit = 0; /* always start this at zero. */
471
472 PROC_INFO_INC(sb, journal.in_journal);
473 /*
474 * If we aren't doing a search_all, this is a metablock, and it
475 * will be logged before use. if we crash before the transaction
476 * that freed it commits, this transaction won't have committed
477 * either, and the block will never be written
478 */
479 if (search_all) {
480 for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
481 PROC_INFO_INC(sb, journal.in_journal_bitmap);
482 jb = journal->j_list_bitmap + i;
483 if (jb->journal_list && jb->bitmaps[bmap_nr] &&
484 test_bit(bit_nr,
485 (unsigned long *)jb->bitmaps[bmap_nr]->
486 data)) {
487 *next_zero_bit =
488 find_next_zero_bit((unsigned long *)
489 (jb->bitmaps[bmap_nr]->
490 data),
491 sb->s_blocksize << 3,
492 bit_nr + 1);
493 return 1;
494 }
495 }
496 }
497
498 bl = bmap_nr * (sb->s_blocksize << 3) + bit_nr;
499 /* is it in any old transactions? */
500 if (search_all
501 && (cn =
502 get_journal_hash_dev(sb, journal->j_list_hash_table, bl))) {
503 return 1;
504 }
505
506 /* is it in the current transaction. This should never happen */
507 if ((cn = get_journal_hash_dev(sb, journal->j_hash_table, bl))) {
508 BUG();
509 return 1;
510 }
511
512 PROC_INFO_INC(sb, journal.in_journal_reusable);
513 /* safe for reuse */
514 return 0;
515 }
516
517 /* insert cn into table */
518 static inline void insert_journal_hash(struct reiserfs_journal_cnode **table,
519 struct reiserfs_journal_cnode *cn)
520 {
521 struct reiserfs_journal_cnode *cn_orig;
522
523 cn_orig = journal_hash(table, cn->sb, cn->blocknr);
524 cn->hnext = cn_orig;
525 cn->hprev = NULL;
526 if (cn_orig) {
527 cn_orig->hprev = cn;
528 }
529 journal_hash(table, cn->sb, cn->blocknr) = cn;
530 }
531
532 /* lock the current transaction */
533 static inline void lock_journal(struct super_block *sb)
534 {
535 PROC_INFO_INC(sb, journal.lock_journal);
536
537 reiserfs_mutex_lock_safe(&SB_JOURNAL(sb)->j_mutex, sb);
538 }
539
540 /* unlock the current transaction */
541 static inline void unlock_journal(struct super_block *sb)
542 {
543 mutex_unlock(&SB_JOURNAL(sb)->j_mutex);
544 }
545
546 static inline void get_journal_list(struct reiserfs_journal_list *jl)
547 {
548 jl->j_refcount++;
549 }
550
551 static inline void put_journal_list(struct super_block *s,
552 struct reiserfs_journal_list *jl)
553 {
554 if (jl->j_refcount < 1) {
555 reiserfs_panic(s, "journal-2", "trans id %u, refcount at %d",
556 jl->j_trans_id, jl->j_refcount);
557 }
558 if (--jl->j_refcount == 0)
559 kfree(jl);
560 }
561
562 /*
563 * this used to be much more involved, and I'm keeping it just in case
564 * things get ugly again. it gets called by flush_commit_list, and
565 * cleans up any data stored about blocks freed during a transaction.
566 */
567 static void cleanup_freed_for_journal_list(struct super_block *sb,
568 struct reiserfs_journal_list *jl)
569 {
570
571 struct reiserfs_list_bitmap *jb = jl->j_list_bitmap;
572 if (jb) {
573 cleanup_bitmap_list(sb, jb);
574 }
575 jl->j_list_bitmap->journal_list = NULL;
576 jl->j_list_bitmap = NULL;
577 }
578
579 static int journal_list_still_alive(struct super_block *s,
580 unsigned int trans_id)
581 {
582 struct reiserfs_journal *journal = SB_JOURNAL(s);
583 struct list_head *entry = &journal->j_journal_list;
584 struct reiserfs_journal_list *jl;
585
586 if (!list_empty(entry)) {
587 jl = JOURNAL_LIST_ENTRY(entry->next);
588 if (jl->j_trans_id <= trans_id) {
589 return 1;
590 }
591 }
592 return 0;
593 }
594
595 /*
596 * If page->mapping was null, we failed to truncate this page for
597 * some reason. Most likely because it was truncated after being
598 * logged via data=journal.
599 *
600 * This does a check to see if the buffer belongs to one of these
601 * lost pages before doing the final put_bh. If page->mapping was
602 * null, it tries to free buffers on the page, which should make the
603 * final put_page drop the page from the lru.
604 */
605 static void release_buffer_page(struct buffer_head *bh)
606 {
607 struct page *page = bh->b_page;
608 if (!page->mapping && trylock_page(page)) {
609 get_page(page);
610 put_bh(bh);
611 if (!page->mapping)
612 try_to_free_buffers(page);
613 unlock_page(page);
614 put_page(page);
615 } else {
616 put_bh(bh);
617 }
618 }
619
620 static void reiserfs_end_buffer_io_sync(struct buffer_head *bh, int uptodate)
621 {
622 if (buffer_journaled(bh)) {
623 reiserfs_warning(NULL, "clm-2084",
624 "pinned buffer %lu:%pg sent to disk",
625 bh->b_blocknr, bh->b_bdev);
626 }
627 if (uptodate)
628 set_buffer_uptodate(bh);
629 else
630 clear_buffer_uptodate(bh);
631
632 unlock_buffer(bh);
633 release_buffer_page(bh);
634 }
635
636 static void reiserfs_end_ordered_io(struct buffer_head *bh, int uptodate)
637 {
638 if (uptodate)
639 set_buffer_uptodate(bh);
640 else
641 clear_buffer_uptodate(bh);
642 unlock_buffer(bh);
643 put_bh(bh);
644 }
645
646 static void submit_logged_buffer(struct buffer_head *bh)
647 {
648 get_bh(bh);
649 bh->b_end_io = reiserfs_end_buffer_io_sync;
650 clear_buffer_journal_new(bh);
651 clear_buffer_dirty(bh);
652 if (!test_clear_buffer_journal_test(bh))
653 BUG();
654 if (!buffer_uptodate(bh))
655 BUG();
656 submit_bh(REQ_OP_WRITE, 0, bh);
657 }
658
659 static void submit_ordered_buffer(struct buffer_head *bh)
660 {
661 get_bh(bh);
662 bh->b_end_io = reiserfs_end_ordered_io;
663 clear_buffer_dirty(bh);
664 if (!buffer_uptodate(bh))
665 BUG();
666 submit_bh(REQ_OP_WRITE, 0, bh);
667 }
668
669 #define CHUNK_SIZE 32
670 struct buffer_chunk {
671 struct buffer_head *bh[CHUNK_SIZE];
672 int nr;
673 };
674
675 static void write_chunk(struct buffer_chunk *chunk)
676 {
677 int i;
678 for (i = 0; i < chunk->nr; i++) {
679 submit_logged_buffer(chunk->bh[i]);
680 }
681 chunk->nr = 0;
682 }
683
684 static void write_ordered_chunk(struct buffer_chunk *chunk)
685 {
686 int i;
687 for (i = 0; i < chunk->nr; i++) {
688 submit_ordered_buffer(chunk->bh[i]);
689 }
690 chunk->nr = 0;
691 }
692
693 static int add_to_chunk(struct buffer_chunk *chunk, struct buffer_head *bh,
694 spinlock_t * lock, void (fn) (struct buffer_chunk *))
695 {
696 int ret = 0;
697 BUG_ON(chunk->nr >= CHUNK_SIZE);
698 chunk->bh[chunk->nr++] = bh;
699 if (chunk->nr >= CHUNK_SIZE) {
700 ret = 1;
701 if (lock) {
702 spin_unlock(lock);
703 fn(chunk);
704 spin_lock(lock);
705 } else {
706 fn(chunk);
707 }
708 }
709 return ret;
710 }
711
712 static atomic_t nr_reiserfs_jh = ATOMIC_INIT(0);
713 static struct reiserfs_jh *alloc_jh(void)
714 {
715 struct reiserfs_jh *jh;
716 while (1) {
717 jh = kmalloc(sizeof(*jh), GFP_NOFS);
718 if (jh) {
719 atomic_inc(&nr_reiserfs_jh);
720 return jh;
721 }
722 yield();
723 }
724 }
725
726 /*
727 * we want to free the jh when the buffer has been written
728 * and waited on
729 */
730 void reiserfs_free_jh(struct buffer_head *bh)
731 {
732 struct reiserfs_jh *jh;
733
734 jh = bh->b_private;
735 if (jh) {
736 bh->b_private = NULL;
737 jh->bh = NULL;
738 list_del_init(&jh->list);
739 kfree(jh);
740 if (atomic_read(&nr_reiserfs_jh) <= 0)
741 BUG();
742 atomic_dec(&nr_reiserfs_jh);
743 put_bh(bh);
744 }
745 }
746
747 static inline int __add_jh(struct reiserfs_journal *j, struct buffer_head *bh,
748 int tail)
749 {
750 struct reiserfs_jh *jh;
751
752 if (bh->b_private) {
753 spin_lock(&j->j_dirty_buffers_lock);
754 if (!bh->b_private) {
755 spin_unlock(&j->j_dirty_buffers_lock);
756 goto no_jh;
757 }
758 jh = bh->b_private;
759 list_del_init(&jh->list);
760 } else {
761 no_jh:
762 get_bh(bh);
763 jh = alloc_jh();
764 spin_lock(&j->j_dirty_buffers_lock);
765 /*
766 * buffer must be locked for __add_jh, should be able to have
767 * two adds at the same time
768 */
769 BUG_ON(bh->b_private);
770 jh->bh = bh;
771 bh->b_private = jh;
772 }
773 jh->jl = j->j_current_jl;
774 if (tail)
775 list_add_tail(&jh->list, &jh->jl->j_tail_bh_list);
776 else {
777 list_add_tail(&jh->list, &jh->jl->j_bh_list);
778 }
779 spin_unlock(&j->j_dirty_buffers_lock);
780 return 0;
781 }
782
783 int reiserfs_add_tail_list(struct inode *inode, struct buffer_head *bh)
784 {
785 return __add_jh(SB_JOURNAL(inode->i_sb), bh, 1);
786 }
787 int reiserfs_add_ordered_list(struct inode *inode, struct buffer_head *bh)
788 {
789 return __add_jh(SB_JOURNAL(inode->i_sb), bh, 0);
790 }
791
792 #define JH_ENTRY(l) list_entry((l), struct reiserfs_jh, list)
793 static int write_ordered_buffers(spinlock_t * lock,
794 struct reiserfs_journal *j,
795 struct reiserfs_journal_list *jl,
796 struct list_head *list)
797 {
798 struct buffer_head *bh;
799 struct reiserfs_jh *jh;
800 int ret = j->j_errno;
801 struct buffer_chunk chunk;
802 struct list_head tmp;
803 INIT_LIST_HEAD(&tmp);
804
805 chunk.nr = 0;
806 spin_lock(lock);
807 while (!list_empty(list)) {
808 jh = JH_ENTRY(list->next);
809 bh = jh->bh;
810 get_bh(bh);
811 if (!trylock_buffer(bh)) {
812 if (!buffer_dirty(bh)) {
813 list_move(&jh->list, &tmp);
814 goto loop_next;
815 }
816 spin_unlock(lock);
817 if (chunk.nr)
818 write_ordered_chunk(&chunk);
819 wait_on_buffer(bh);
820 cond_resched();
821 spin_lock(lock);
822 goto loop_next;
823 }
824 /*
825 * in theory, dirty non-uptodate buffers should never get here,
826 * but the upper layer io error paths still have a few quirks.
827 * Handle them here as gracefully as we can
828 */
829 if (!buffer_uptodate(bh) && buffer_dirty(bh)) {
830 clear_buffer_dirty(bh);
831 ret = -EIO;
832 }
833 if (buffer_dirty(bh)) {
834 list_move(&jh->list, &tmp);
835 add_to_chunk(&chunk, bh, lock, write_ordered_chunk);
836 } else {
837 reiserfs_free_jh(bh);
838 unlock_buffer(bh);
839 }
840 loop_next:
841 put_bh(bh);
842 cond_resched_lock(lock);
843 }
844 if (chunk.nr) {
845 spin_unlock(lock);
846 write_ordered_chunk(&chunk);
847 spin_lock(lock);
848 }
849 while (!list_empty(&tmp)) {
850 jh = JH_ENTRY(tmp.prev);
851 bh = jh->bh;
852 get_bh(bh);
853 reiserfs_free_jh(bh);
854
855 if (buffer_locked(bh)) {
856 spin_unlock(lock);
857 wait_on_buffer(bh);
858 spin_lock(lock);
859 }
860 if (!buffer_uptodate(bh)) {
861 ret = -EIO;
862 }
863 /*
864 * ugly interaction with invalidatepage here.
865 * reiserfs_invalidate_page will pin any buffer that has a
866 * valid journal head from an older transaction. If someone
867 * else sets our buffer dirty after we write it in the first
868 * loop, and then someone truncates the page away, nobody
869 * will ever write the buffer. We're safe if we write the
870 * page one last time after freeing the journal header.
871 */
872 if (buffer_dirty(bh) && unlikely(bh->b_page->mapping == NULL)) {
873 spin_unlock(lock);
874 ll_rw_block(REQ_OP_WRITE, 0, 1, &bh);
875 spin_lock(lock);
876 }
877 put_bh(bh);
878 cond_resched_lock(lock);
879 }
880 spin_unlock(lock);
881 return ret;
882 }
883
884 static int flush_older_commits(struct super_block *s,
885 struct reiserfs_journal_list *jl)
886 {
887 struct reiserfs_journal *journal = SB_JOURNAL(s);
888 struct reiserfs_journal_list *other_jl;
889 struct reiserfs_journal_list *first_jl;
890 struct list_head *entry;
891 unsigned int trans_id = jl->j_trans_id;
892 unsigned int other_trans_id;
893 unsigned int first_trans_id;
894
895 find_first:
896 /*
897 * first we walk backwards to find the oldest uncommitted transation
898 */
899 first_jl = jl;
900 entry = jl->j_list.prev;
901 while (1) {
902 other_jl = JOURNAL_LIST_ENTRY(entry);
903 if (entry == &journal->j_journal_list ||
904 atomic_read(&other_jl->j_older_commits_done))
905 break;
906
907 first_jl = other_jl;
908 entry = other_jl->j_list.prev;
909 }
910
911 /* if we didn't find any older uncommitted transactions, return now */
912 if (first_jl == jl) {
913 return 0;
914 }
915
916 first_trans_id = first_jl->j_trans_id;
917
918 entry = &first_jl->j_list;
919 while (1) {
920 other_jl = JOURNAL_LIST_ENTRY(entry);
921 other_trans_id = other_jl->j_trans_id;
922
923 if (other_trans_id < trans_id) {
924 if (atomic_read(&other_jl->j_commit_left) != 0) {
925 flush_commit_list(s, other_jl, 0);
926
927 /* list we were called with is gone, return */
928 if (!journal_list_still_alive(s, trans_id))
929 return 1;
930
931 /*
932 * the one we just flushed is gone, this means
933 * all older lists are also gone, so first_jl
934 * is no longer valid either. Go back to the
935 * beginning.
936 */
937 if (!journal_list_still_alive
938 (s, other_trans_id)) {
939 goto find_first;
940 }
941 }
942 entry = entry->next;
943 if (entry == &journal->j_journal_list)
944 return 0;
945 } else {
946 return 0;
947 }
948 }
949 return 0;
950 }
951
952 static int reiserfs_async_progress_wait(struct super_block *s)
953 {
954 struct reiserfs_journal *j = SB_JOURNAL(s);
955
956 if (atomic_read(&j->j_async_throttle)) {
957 int depth;
958
959 depth = reiserfs_write_unlock_nested(s);
960 congestion_wait(BLK_RW_ASYNC, HZ / 10);
961 reiserfs_write_lock_nested(s, depth);
962 }
963
964 return 0;
965 }
966
967 /*
968 * if this journal list still has commit blocks unflushed, send them to disk.
969 *
970 * log areas must be flushed in order (transaction 2 can't commit before
971 * transaction 1) Before the commit block can by written, every other log
972 * block must be safely on disk
973 */
974 static int flush_commit_list(struct super_block *s,
975 struct reiserfs_journal_list *jl, int flushall)
976 {
977 int i;
978 b_blocknr_t bn;
979 struct buffer_head *tbh = NULL;
980 unsigned int trans_id = jl->j_trans_id;
981 struct reiserfs_journal *journal = SB_JOURNAL(s);
982 int retval = 0;
983 int write_len;
984 int depth;
985
986 reiserfs_check_lock_depth(s, "flush_commit_list");
987
988 if (atomic_read(&jl->j_older_commits_done)) {
989 return 0;
990 }
991
992 /*
993 * before we can put our commit blocks on disk, we have to make
994 * sure everyone older than us is on disk too
995 */
996 BUG_ON(jl->j_len <= 0);
997 BUG_ON(trans_id == journal->j_trans_id);
998
999 get_journal_list(jl);
1000 if (flushall) {
1001 if (flush_older_commits(s, jl) == 1) {
1002 /*
1003 * list disappeared during flush_older_commits.
1004 * return
1005 */
1006 goto put_jl;
1007 }
1008 }
1009
1010 /* make sure nobody is trying to flush this one at the same time */
1011 reiserfs_mutex_lock_safe(&jl->j_commit_mutex, s);
1012
1013 if (!journal_list_still_alive(s, trans_id)) {
1014 mutex_unlock(&jl->j_commit_mutex);
1015 goto put_jl;
1016 }
1017 BUG_ON(jl->j_trans_id == 0);
1018
1019 /* this commit is done, exit */
1020 if (atomic_read(&jl->j_commit_left) <= 0) {
1021 if (flushall) {
1022 atomic_set(&jl->j_older_commits_done, 1);
1023 }
1024 mutex_unlock(&jl->j_commit_mutex);
1025 goto put_jl;
1026 }
1027
1028 if (!list_empty(&jl->j_bh_list)) {
1029 int ret;
1030
1031 /*
1032 * We might sleep in numerous places inside
1033 * write_ordered_buffers. Relax the write lock.
1034 */
1035 depth = reiserfs_write_unlock_nested(s);
1036 ret = write_ordered_buffers(&journal->j_dirty_buffers_lock,
1037 journal, jl, &jl->j_bh_list);
1038 if (ret < 0 && retval == 0)
1039 retval = ret;
1040 reiserfs_write_lock_nested(s, depth);
1041 }
1042 BUG_ON(!list_empty(&jl->j_bh_list));
1043 /*
1044 * for the description block and all the log blocks, submit any buffers
1045 * that haven't already reached the disk. Try to write at least 256
1046 * log blocks. later on, we will only wait on blocks that correspond
1047 * to this transaction, but while we're unplugging we might as well
1048 * get a chunk of data on there.
1049 */
1050 atomic_inc(&journal->j_async_throttle);
1051 write_len = jl->j_len + 1;
1052 if (write_len < 256)
1053 write_len = 256;
1054 for (i = 0 ; i < write_len ; i++) {
1055 bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) + (jl->j_start + i) %
1056 SB_ONDISK_JOURNAL_SIZE(s);
1057 tbh = journal_find_get_block(s, bn);
1058 if (tbh) {
1059 if (buffer_dirty(tbh)) {
1060 depth = reiserfs_write_unlock_nested(s);
1061 ll_rw_block(REQ_OP_WRITE, 0, 1, &tbh);
1062 reiserfs_write_lock_nested(s, depth);
1063 }
1064 put_bh(tbh) ;
1065 }
1066 }
1067 atomic_dec(&journal->j_async_throttle);
1068
1069 for (i = 0; i < (jl->j_len + 1); i++) {
1070 bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) +
1071 (jl->j_start + i) % SB_ONDISK_JOURNAL_SIZE(s);
1072 tbh = journal_find_get_block(s, bn);
1073
1074 depth = reiserfs_write_unlock_nested(s);
1075 __wait_on_buffer(tbh);
1076 reiserfs_write_lock_nested(s, depth);
1077 /*
1078 * since we're using ll_rw_blk above, it might have skipped
1079 * over a locked buffer. Double check here
1080 */
1081 /* redundant, sync_dirty_buffer() checks */
1082 if (buffer_dirty(tbh)) {
1083 depth = reiserfs_write_unlock_nested(s);
1084 sync_dirty_buffer(tbh);
1085 reiserfs_write_lock_nested(s, depth);
1086 }
1087 if (unlikely(!buffer_uptodate(tbh))) {
1088 #ifdef CONFIG_REISERFS_CHECK
1089 reiserfs_warning(s, "journal-601",
1090 "buffer write failed");
1091 #endif
1092 retval = -EIO;
1093 }
1094 /* once for journal_find_get_block */
1095 put_bh(tbh);
1096 /* once due to original getblk in do_journal_end */
1097 put_bh(tbh);
1098 atomic_dec(&jl->j_commit_left);
1099 }
1100
1101 BUG_ON(atomic_read(&jl->j_commit_left) != 1);
1102
1103 /*
1104 * If there was a write error in the journal - we can't commit
1105 * this transaction - it will be invalid and, if successful,
1106 * will just end up propagating the write error out to
1107 * the file system.
1108 */
1109 if (likely(!retval && !reiserfs_is_journal_aborted (journal))) {
1110 if (buffer_dirty(jl->j_commit_bh))
1111 BUG();
1112 mark_buffer_dirty(jl->j_commit_bh) ;
1113 depth = reiserfs_write_unlock_nested(s);
1114 if (reiserfs_barrier_flush(s))
1115 __sync_dirty_buffer(jl->j_commit_bh,
1116 REQ_SYNC | REQ_PREFLUSH | REQ_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,
1275 REQ_SYNC | REQ_PREFLUSH | REQ_FUA);
1276 else
1277 sync_dirty_buffer(journal->j_header_bh);
1278
1279 reiserfs_write_lock_nested(sb, depth);
1280 if (!buffer_uptodate(journal->j_header_bh)) {
1281 reiserfs_warning(sb, "journal-837",
1282 "IO error during journal replay");
1283 return -EIO;
1284 }
1285 }
1286 return 0;
1287 }
1288
1289 static int update_journal_header_block(struct super_block *sb,
1290 unsigned long offset,
1291 unsigned int trans_id)
1292 {
1293 return _update_journal_header_block(sb, offset, trans_id);
1294 }
1295
1296 /*
1297 ** flush any and all journal lists older than you are
1298 ** can only be called from flush_journal_list
1299 */
1300 static int flush_older_journal_lists(struct super_block *sb,
1301 struct reiserfs_journal_list *jl)
1302 {
1303 struct list_head *entry;
1304 struct reiserfs_journal_list *other_jl;
1305 struct reiserfs_journal *journal = SB_JOURNAL(sb);
1306 unsigned int trans_id = jl->j_trans_id;
1307
1308 /*
1309 * we know we are the only ones flushing things, no extra race
1310 * protection is required.
1311 */
1312 restart:
1313 entry = journal->j_journal_list.next;
1314 /* Did we wrap? */
1315 if (entry == &journal->j_journal_list)
1316 return 0;
1317 other_jl = JOURNAL_LIST_ENTRY(entry);
1318 if (other_jl->j_trans_id < trans_id) {
1319 BUG_ON(other_jl->j_refcount <= 0);
1320 /* do not flush all */
1321 flush_journal_list(sb, other_jl, 0);
1322
1323 /* other_jl is now deleted from the list */
1324 goto restart;
1325 }
1326 return 0;
1327 }
1328
1329 static void del_from_work_list(struct super_block *s,
1330 struct reiserfs_journal_list *jl)
1331 {
1332 struct reiserfs_journal *journal = SB_JOURNAL(s);
1333 if (!list_empty(&jl->j_working_list)) {
1334 list_del_init(&jl->j_working_list);
1335 journal->j_num_work_lists--;
1336 }
1337 }
1338
1339 /*
1340 * flush a journal list, both commit and real blocks
1341 *
1342 * always set flushall to 1, unless you are calling from inside
1343 * flush_journal_list
1344 *
1345 * IMPORTANT. This can only be called while there are no journal writers,
1346 * and the journal is locked. That means it can only be called from
1347 * do_journal_end, or by journal_release
1348 */
1349 static int flush_journal_list(struct super_block *s,
1350 struct reiserfs_journal_list *jl, int flushall)
1351 {
1352 struct reiserfs_journal_list *pjl;
1353 struct reiserfs_journal_cnode *cn, *last;
1354 int count;
1355 int was_jwait = 0;
1356 int was_dirty = 0;
1357 struct buffer_head *saved_bh;
1358 unsigned long j_len_saved = jl->j_len;
1359 struct reiserfs_journal *journal = SB_JOURNAL(s);
1360 int err = 0;
1361 int depth;
1362
1363 BUG_ON(j_len_saved <= 0);
1364
1365 if (atomic_read(&journal->j_wcount) != 0) {
1366 reiserfs_warning(s, "clm-2048", "called with wcount %d",
1367 atomic_read(&journal->j_wcount));
1368 }
1369
1370 /* if flushall == 0, the lock is already held */
1371 if (flushall) {
1372 reiserfs_mutex_lock_safe(&journal->j_flush_mutex, s);
1373 } else if (mutex_trylock(&journal->j_flush_mutex)) {
1374 BUG();
1375 }
1376
1377 count = 0;
1378 if (j_len_saved > journal->j_trans_max) {
1379 reiserfs_panic(s, "journal-715", "length is %lu, trans id %lu",
1380 j_len_saved, jl->j_trans_id);
1381 return 0;
1382 }
1383
1384 /* if all the work is already done, get out of here */
1385 if (atomic_read(&jl->j_nonzerolen) <= 0 &&
1386 atomic_read(&jl->j_commit_left) <= 0) {
1387 goto flush_older_and_return;
1388 }
1389
1390 /*
1391 * start by putting the commit list on disk. This will also flush
1392 * the commit lists of any olders transactions
1393 */
1394 flush_commit_list(s, jl, 1);
1395
1396 if (!(jl->j_state & LIST_DIRTY)
1397 && !reiserfs_is_journal_aborted(journal))
1398 BUG();
1399
1400 /* are we done now? */
1401 if (atomic_read(&jl->j_nonzerolen) <= 0 &&
1402 atomic_read(&jl->j_commit_left) <= 0) {
1403 goto flush_older_and_return;
1404 }
1405
1406 /*
1407 * loop through each cnode, see if we need to write it,
1408 * or wait on a more recent transaction, or just ignore it
1409 */
1410 if (atomic_read(&journal->j_wcount) != 0) {
1411 reiserfs_panic(s, "journal-844", "journal list is flushing, "
1412 "wcount is not 0");
1413 }
1414 cn = jl->j_realblock;
1415 while (cn) {
1416 was_jwait = 0;
1417 was_dirty = 0;
1418 saved_bh = NULL;
1419 /* blocknr of 0 is no longer in the hash, ignore it */
1420 if (cn->blocknr == 0) {
1421 goto free_cnode;
1422 }
1423
1424 /*
1425 * This transaction failed commit.
1426 * Don't write out to the disk
1427 */
1428 if (!(jl->j_state & LIST_DIRTY))
1429 goto free_cnode;
1430
1431 pjl = find_newer_jl_for_cn(cn);
1432 /*
1433 * the order is important here. We check pjl to make sure we
1434 * don't clear BH_JDirty_wait if we aren't the one writing this
1435 * block to disk
1436 */
1437 if (!pjl && cn->bh) {
1438 saved_bh = cn->bh;
1439
1440 /*
1441 * we do this to make sure nobody releases the
1442 * buffer while we are working with it
1443 */
1444 get_bh(saved_bh);
1445
1446 if (buffer_journal_dirty(saved_bh)) {
1447 BUG_ON(!can_dirty(cn));
1448 was_jwait = 1;
1449 was_dirty = 1;
1450 } else if (can_dirty(cn)) {
1451 /*
1452 * everything with !pjl && jwait
1453 * should be writable
1454 */
1455 BUG();
1456 }
1457 }
1458
1459 /*
1460 * if someone has this block in a newer transaction, just make
1461 * sure they are committed, and don't try writing it to disk
1462 */
1463 if (pjl) {
1464 if (atomic_read(&pjl->j_commit_left))
1465 flush_commit_list(s, pjl, 1);
1466 goto free_cnode;
1467 }
1468
1469 /*
1470 * bh == NULL when the block got to disk on its own, OR,
1471 * the block got freed in a future transaction
1472 */
1473 if (saved_bh == NULL) {
1474 goto free_cnode;
1475 }
1476
1477 /*
1478 * this should never happen. kupdate_one_transaction has
1479 * this list locked while it works, so we should never see a
1480 * buffer here that is not marked JDirty_wait
1481 */
1482 if ((!was_jwait) && !buffer_locked(saved_bh)) {
1483 reiserfs_warning(s, "journal-813",
1484 "BAD! buffer %llu %cdirty %cjwait, "
1485 "not in a newer transaction",
1486 (unsigned long long)saved_bh->
1487 b_blocknr, was_dirty ? ' ' : '!',
1488 was_jwait ? ' ' : '!');
1489 }
1490 if (was_dirty) {
1491 /*
1492 * we inc again because saved_bh gets decremented
1493 * at free_cnode
1494 */
1495 get_bh(saved_bh);
1496 set_bit(BLOCK_NEEDS_FLUSH, &cn->state);
1497 lock_buffer(saved_bh);
1498 BUG_ON(cn->blocknr != saved_bh->b_blocknr);
1499 if (buffer_dirty(saved_bh))
1500 submit_logged_buffer(saved_bh);
1501 else
1502 unlock_buffer(saved_bh);
1503 count++;
1504 } else {
1505 reiserfs_warning(s, "clm-2082",
1506 "Unable to flush buffer %llu in %s",
1507 (unsigned long long)saved_bh->
1508 b_blocknr, __func__);
1509 }
1510 free_cnode:
1511 last = cn;
1512 cn = cn->next;
1513 if (saved_bh) {
1514 /*
1515 * we incremented this to keep others from
1516 * taking the buffer head away
1517 */
1518 put_bh(saved_bh);
1519 if (atomic_read(&saved_bh->b_count) < 0) {
1520 reiserfs_warning(s, "journal-945",
1521 "saved_bh->b_count < 0");
1522 }
1523 }
1524 }
1525 if (count > 0) {
1526 cn = jl->j_realblock;
1527 while (cn) {
1528 if (test_bit(BLOCK_NEEDS_FLUSH, &cn->state)) {
1529 if (!cn->bh) {
1530 reiserfs_panic(s, "journal-1011",
1531 "cn->bh is NULL");
1532 }
1533
1534 depth = reiserfs_write_unlock_nested(s);
1535 __wait_on_buffer(cn->bh);
1536 reiserfs_write_lock_nested(s, depth);
1537
1538 if (!cn->bh) {
1539 reiserfs_panic(s, "journal-1012",
1540 "cn->bh is NULL");
1541 }
1542 if (unlikely(!buffer_uptodate(cn->bh))) {
1543 #ifdef CONFIG_REISERFS_CHECK
1544 reiserfs_warning(s, "journal-949",
1545 "buffer write failed");
1546 #endif
1547 err = -EIO;
1548 }
1549 /*
1550 * note, we must clear the JDirty_wait bit
1551 * after the up to date check, otherwise we
1552 * race against our flushpage routine
1553 */
1554 BUG_ON(!test_clear_buffer_journal_dirty
1555 (cn->bh));
1556
1557 /* drop one ref for us */
1558 put_bh(cn->bh);
1559 /* drop one ref for journal_mark_dirty */
1560 release_buffer_page(cn->bh);
1561 }
1562 cn = cn->next;
1563 }
1564 }
1565
1566 if (err)
1567 reiserfs_abort(s, -EIO,
1568 "Write error while pushing transaction to disk in %s",
1569 __func__);
1570 flush_older_and_return:
1571
1572 /*
1573 * before we can update the journal header block, we _must_ flush all
1574 * real blocks from all older transactions to disk. This is because
1575 * once the header block is updated, this transaction will not be
1576 * replayed after a crash
1577 */
1578 if (flushall) {
1579 flush_older_journal_lists(s, jl);
1580 }
1581
1582 err = journal->j_errno;
1583 /*
1584 * before we can remove everything from the hash tables for this
1585 * transaction, we must make sure it can never be replayed
1586 *
1587 * since we are only called from do_journal_end, we know for sure there
1588 * are no allocations going on while we are flushing journal lists. So,
1589 * we only need to update the journal header block for the last list
1590 * being flushed
1591 */
1592 if (!err && flushall) {
1593 err =
1594 update_journal_header_block(s,
1595 (jl->j_start + jl->j_len +
1596 2) % SB_ONDISK_JOURNAL_SIZE(s),
1597 jl->j_trans_id);
1598 if (err)
1599 reiserfs_abort(s, -EIO,
1600 "Write error while updating journal header in %s",
1601 __func__);
1602 }
1603 remove_all_from_journal_list(s, jl, 0);
1604 list_del_init(&jl->j_list);
1605 journal->j_num_lists--;
1606 del_from_work_list(s, jl);
1607
1608 if (journal->j_last_flush_id != 0 &&
1609 (jl->j_trans_id - journal->j_last_flush_id) != 1) {
1610 reiserfs_warning(s, "clm-2201", "last flush %lu, current %lu",
1611 journal->j_last_flush_id, jl->j_trans_id);
1612 }
1613 journal->j_last_flush_id = jl->j_trans_id;
1614
1615 /*
1616 * not strictly required since we are freeing the list, but it should
1617 * help find code using dead lists later on
1618 */
1619 jl->j_len = 0;
1620 atomic_set(&jl->j_nonzerolen, 0);
1621 jl->j_start = 0;
1622 jl->j_realblock = NULL;
1623 jl->j_commit_bh = NULL;
1624 jl->j_trans_id = 0;
1625 jl->j_state = 0;
1626 put_journal_list(s, jl);
1627 if (flushall)
1628 mutex_unlock(&journal->j_flush_mutex);
1629 return err;
1630 }
1631
1632 static int write_one_transaction(struct super_block *s,
1633 struct reiserfs_journal_list *jl,
1634 struct buffer_chunk *chunk)
1635 {
1636 struct reiserfs_journal_cnode *cn;
1637 int ret = 0;
1638
1639 jl->j_state |= LIST_TOUCHED;
1640 del_from_work_list(s, jl);
1641 if (jl->j_len == 0 || atomic_read(&jl->j_nonzerolen) == 0) {
1642 return 0;
1643 }
1644
1645 cn = jl->j_realblock;
1646 while (cn) {
1647 /*
1648 * if the blocknr == 0, this has been cleared from the hash,
1649 * skip it
1650 */
1651 if (cn->blocknr == 0) {
1652 goto next;
1653 }
1654 if (cn->bh && can_dirty(cn) && buffer_dirty(cn->bh)) {
1655 struct buffer_head *tmp_bh;
1656 /*
1657 * we can race against journal_mark_freed when we try
1658 * to lock_buffer(cn->bh), so we have to inc the buffer
1659 * count, and recheck things after locking
1660 */
1661 tmp_bh = cn->bh;
1662 get_bh(tmp_bh);
1663 lock_buffer(tmp_bh);
1664 if (cn->bh && can_dirty(cn) && buffer_dirty(tmp_bh)) {
1665 if (!buffer_journal_dirty(tmp_bh) ||
1666 buffer_journal_prepared(tmp_bh))
1667 BUG();
1668 add_to_chunk(chunk, tmp_bh, NULL, write_chunk);
1669 ret++;
1670 } else {
1671 /* note, cn->bh might be null now */
1672 unlock_buffer(tmp_bh);
1673 }
1674 put_bh(tmp_bh);
1675 }
1676 next:
1677 cn = cn->next;
1678 cond_resched();
1679 }
1680 return ret;
1681 }
1682
1683 /* used by flush_commit_list */
1684 static int dirty_one_transaction(struct super_block *s,
1685 struct reiserfs_journal_list *jl)
1686 {
1687 struct reiserfs_journal_cnode *cn;
1688 struct reiserfs_journal_list *pjl;
1689 int ret = 0;
1690
1691 jl->j_state |= LIST_DIRTY;
1692 cn = jl->j_realblock;
1693 while (cn) {
1694 /*
1695 * look for a more recent transaction that logged this
1696 * buffer. Only the most recent transaction with a buffer in
1697 * it is allowed to send that buffer to disk
1698 */
1699 pjl = find_newer_jl_for_cn(cn);
1700 if (!pjl && cn->blocknr && cn->bh
1701 && buffer_journal_dirty(cn->bh)) {
1702 BUG_ON(!can_dirty(cn));
1703 /*
1704 * if the buffer is prepared, it will either be logged
1705 * or restored. If restored, we need to make sure
1706 * it actually gets marked dirty
1707 */
1708 clear_buffer_journal_new(cn->bh);
1709 if (buffer_journal_prepared(cn->bh)) {
1710 set_buffer_journal_restore_dirty(cn->bh);
1711 } else {
1712 set_buffer_journal_test(cn->bh);
1713 mark_buffer_dirty(cn->bh);
1714 }
1715 }
1716 cn = cn->next;
1717 }
1718 return ret;
1719 }
1720
1721 static int kupdate_transactions(struct super_block *s,
1722 struct reiserfs_journal_list *jl,
1723 struct reiserfs_journal_list **next_jl,
1724 unsigned int *next_trans_id,
1725 int num_blocks, int num_trans)
1726 {
1727 int ret = 0;
1728 int written = 0;
1729 int transactions_flushed = 0;
1730 unsigned int orig_trans_id = jl->j_trans_id;
1731 struct buffer_chunk chunk;
1732 struct list_head *entry;
1733 struct reiserfs_journal *journal = SB_JOURNAL(s);
1734 chunk.nr = 0;
1735
1736 reiserfs_mutex_lock_safe(&journal->j_flush_mutex, s);
1737 if (!journal_list_still_alive(s, orig_trans_id)) {
1738 goto done;
1739 }
1740
1741 /*
1742 * we've got j_flush_mutex held, nobody is going to delete any
1743 * of these lists out from underneath us
1744 */
1745 while ((num_trans && transactions_flushed < num_trans) ||
1746 (!num_trans && written < num_blocks)) {
1747
1748 if (jl->j_len == 0 || (jl->j_state & LIST_TOUCHED) ||
1749 atomic_read(&jl->j_commit_left)
1750 || !(jl->j_state & LIST_DIRTY)) {
1751 del_from_work_list(s, jl);
1752 break;
1753 }
1754 ret = write_one_transaction(s, jl, &chunk);
1755
1756 if (ret < 0)
1757 goto done;
1758 transactions_flushed++;
1759 written += ret;
1760 entry = jl->j_list.next;
1761
1762 /* did we wrap? */
1763 if (entry == &journal->j_journal_list) {
1764 break;
1765 }
1766 jl = JOURNAL_LIST_ENTRY(entry);
1767
1768 /* don't bother with older transactions */
1769 if (jl->j_trans_id <= orig_trans_id)
1770 break;
1771 }
1772 if (chunk.nr) {
1773 write_chunk(&chunk);
1774 }
1775
1776 done:
1777 mutex_unlock(&journal->j_flush_mutex);
1778 return ret;
1779 }
1780
1781 /*
1782 * for o_sync and fsync heavy applications, they tend to use
1783 * all the journa list slots with tiny transactions. These
1784 * trigger lots and lots of calls to update the header block, which
1785 * adds seeks and slows things down.
1786 *
1787 * This function tries to clear out a large chunk of the journal lists
1788 * at once, which makes everything faster since only the newest journal
1789 * list updates the header block
1790 */
1791 static int flush_used_journal_lists(struct super_block *s,
1792 struct reiserfs_journal_list *jl)
1793 {
1794 unsigned long len = 0;
1795 unsigned long cur_len;
1796 int ret;
1797 int i;
1798 int limit = 256;
1799 struct reiserfs_journal_list *tjl;
1800 struct reiserfs_journal_list *flush_jl;
1801 unsigned int trans_id;
1802 struct reiserfs_journal *journal = SB_JOURNAL(s);
1803
1804 flush_jl = tjl = jl;
1805
1806 /* in data logging mode, try harder to flush a lot of blocks */
1807 if (reiserfs_data_log(s))
1808 limit = 1024;
1809 /* flush for 256 transactions or limit blocks, whichever comes first */
1810 for (i = 0; i < 256 && len < limit; i++) {
1811 if (atomic_read(&tjl->j_commit_left) ||
1812 tjl->j_trans_id < jl->j_trans_id) {
1813 break;
1814 }
1815 cur_len = atomic_read(&tjl->j_nonzerolen);
1816 if (cur_len > 0) {
1817 tjl->j_state &= ~LIST_TOUCHED;
1818 }
1819 len += cur_len;
1820 flush_jl = tjl;
1821 if (tjl->j_list.next == &journal->j_journal_list)
1822 break;
1823 tjl = JOURNAL_LIST_ENTRY(tjl->j_list.next);
1824 }
1825 get_journal_list(jl);
1826 get_journal_list(flush_jl);
1827
1828 /*
1829 * try to find a group of blocks we can flush across all the
1830 * transactions, but only bother if we've actually spanned
1831 * across multiple lists
1832 */
1833 if (flush_jl != jl) {
1834 ret = kupdate_transactions(s, jl, &tjl, &trans_id, len, i);
1835 }
1836 flush_journal_list(s, flush_jl, 1);
1837 put_journal_list(s, flush_jl);
1838 put_journal_list(s, jl);
1839 return 0;
1840 }
1841
1842 /*
1843 * removes any nodes in table with name block and dev as bh.
1844 * only touchs the hnext and hprev pointers.
1845 */
1846 void remove_journal_hash(struct super_block *sb,
1847 struct reiserfs_journal_cnode **table,
1848 struct reiserfs_journal_list *jl,
1849 unsigned long block, int remove_freed)
1850 {
1851 struct reiserfs_journal_cnode *cur;
1852 struct reiserfs_journal_cnode **head;
1853
1854 head = &(journal_hash(table, sb, block));
1855 if (!head) {
1856 return;
1857 }
1858 cur = *head;
1859 while (cur) {
1860 if (cur->blocknr == block && cur->sb == sb
1861 && (jl == NULL || jl == cur->jlist)
1862 && (!test_bit(BLOCK_FREED, &cur->state) || remove_freed)) {
1863 if (cur->hnext) {
1864 cur->hnext->hprev = cur->hprev;
1865 }
1866 if (cur->hprev) {
1867 cur->hprev->hnext = cur->hnext;
1868 } else {
1869 *head = cur->hnext;
1870 }
1871 cur->blocknr = 0;
1872 cur->sb = NULL;
1873 cur->state = 0;
1874 /*
1875 * anybody who clears the cur->bh will also
1876 * dec the nonzerolen
1877 */
1878 if (cur->bh && cur->jlist)
1879 atomic_dec(&cur->jlist->j_nonzerolen);
1880 cur->bh = NULL;
1881 cur->jlist = NULL;
1882 }
1883 cur = cur->hnext;
1884 }
1885 }
1886
1887 static void free_journal_ram(struct super_block *sb)
1888 {
1889 struct reiserfs_journal *journal = SB_JOURNAL(sb);
1890 kfree(journal->j_current_jl);
1891 journal->j_num_lists--;
1892
1893 vfree(journal->j_cnode_free_orig);
1894 free_list_bitmaps(sb, journal->j_list_bitmap);
1895 free_bitmap_nodes(sb); /* must be after free_list_bitmaps */
1896 if (journal->j_header_bh) {
1897 brelse(journal->j_header_bh);
1898 }
1899 /*
1900 * j_header_bh is on the journal dev, make sure
1901 * not to release the journal dev until we brelse j_header_bh
1902 */
1903 release_journal_dev(sb, journal);
1904 vfree(journal);
1905 }
1906
1907 /*
1908 * call on unmount. Only set error to 1 if you haven't made your way out
1909 * of read_super() yet. Any other caller must keep error at 0.
1910 */
1911 static int do_journal_release(struct reiserfs_transaction_handle *th,
1912 struct super_block *sb, int error)
1913 {
1914 struct reiserfs_transaction_handle myth;
1915 int flushed = 0;
1916 struct reiserfs_journal *journal = SB_JOURNAL(sb);
1917
1918 /*
1919 * we only want to flush out transactions if we were
1920 * called with error == 0
1921 */
1922 if (!error && !sb_rdonly(sb)) {
1923 /* end the current trans */
1924 BUG_ON(!th->t_trans_id);
1925 do_journal_end(th, FLUSH_ALL);
1926
1927 /*
1928 * make sure something gets logged to force
1929 * our way into the flush code
1930 */
1931 if (!journal_join(&myth, sb)) {
1932 reiserfs_prepare_for_journal(sb,
1933 SB_BUFFER_WITH_SB(sb),
1934 1);
1935 journal_mark_dirty(&myth, SB_BUFFER_WITH_SB(sb));
1936 do_journal_end(&myth, FLUSH_ALL);
1937 flushed = 1;
1938 }
1939 }
1940
1941 /* this also catches errors during the do_journal_end above */
1942 if (!error && reiserfs_is_journal_aborted(journal)) {
1943 memset(&myth, 0, sizeof(myth));
1944 if (!journal_join_abort(&myth, sb)) {
1945 reiserfs_prepare_for_journal(sb,
1946 SB_BUFFER_WITH_SB(sb),
1947 1);
1948 journal_mark_dirty(&myth, SB_BUFFER_WITH_SB(sb));
1949 do_journal_end(&myth, FLUSH_ALL);
1950 }
1951 }
1952
1953
1954 /*
1955 * We must release the write lock here because
1956 * the workqueue job (flush_async_commit) needs this lock
1957 */
1958 reiserfs_write_unlock(sb);
1959
1960 /*
1961 * Cancel flushing of old commits. Note that neither of these works
1962 * will be requeued because superblock is being shutdown and doesn't
1963 * have SB_ACTIVE set.
1964 */
1965 reiserfs_cancel_old_flush(sb);
1966 /* wait for all commits to finish */
1967 cancel_delayed_work_sync(&SB_JOURNAL(sb)->j_work);
1968
1969 free_journal_ram(sb);
1970
1971 reiserfs_write_lock(sb);
1972
1973 return 0;
1974 }
1975
1976 /* * call on unmount. flush all journal trans, release all alloc'd ram */
1977 int journal_release(struct reiserfs_transaction_handle *th,
1978 struct super_block *sb)
1979 {
1980 return do_journal_release(th, sb, 0);
1981 }
1982
1983 /* only call from an error condition inside reiserfs_read_super! */
1984 int journal_release_error(struct reiserfs_transaction_handle *th,
1985 struct super_block *sb)
1986 {
1987 return do_journal_release(th, sb, 1);
1988 }
1989
1990 /*
1991 * compares description block with commit block.
1992 * returns 1 if they differ, 0 if they are the same
1993 */
1994 static int journal_compare_desc_commit(struct super_block *sb,
1995 struct reiserfs_journal_desc *desc,
1996 struct reiserfs_journal_commit *commit)
1997 {
1998 if (get_commit_trans_id(commit) != get_desc_trans_id(desc) ||
1999 get_commit_trans_len(commit) != get_desc_trans_len(desc) ||
2000 get_commit_trans_len(commit) > SB_JOURNAL(sb)->j_trans_max ||
2001 get_commit_trans_len(commit) <= 0) {
2002 return 1;
2003 }
2004 return 0;
2005 }
2006
2007 /*
2008 * returns 0 if it did not find a description block
2009 * returns -1 if it found a corrupt commit block
2010 * returns 1 if both desc and commit were valid
2011 * NOTE: only called during fs mount
2012 */
2013 static int journal_transaction_is_valid(struct super_block *sb,
2014 struct buffer_head *d_bh,
2015 unsigned int *oldest_invalid_trans_id,
2016 unsigned long *newest_mount_id)
2017 {
2018 struct reiserfs_journal_desc *desc;
2019 struct reiserfs_journal_commit *commit;
2020 struct buffer_head *c_bh;
2021 unsigned long offset;
2022
2023 if (!d_bh)
2024 return 0;
2025
2026 desc = (struct reiserfs_journal_desc *)d_bh->b_data;
2027 if (get_desc_trans_len(desc) > 0
2028 && !memcmp(get_journal_desc_magic(d_bh), JOURNAL_DESC_MAGIC, 8)) {
2029 if (oldest_invalid_trans_id && *oldest_invalid_trans_id
2030 && get_desc_trans_id(desc) > *oldest_invalid_trans_id) {
2031 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2032 "journal-986: transaction "
2033 "is valid returning because trans_id %d is greater than "
2034 "oldest_invalid %lu",
2035 get_desc_trans_id(desc),
2036 *oldest_invalid_trans_id);
2037 return 0;
2038 }
2039 if (newest_mount_id
2040 && *newest_mount_id > get_desc_mount_id(desc)) {
2041 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2042 "journal-1087: transaction "
2043 "is valid returning because mount_id %d is less than "
2044 "newest_mount_id %lu",
2045 get_desc_mount_id(desc),
2046 *newest_mount_id);
2047 return -1;
2048 }
2049 if (get_desc_trans_len(desc) > SB_JOURNAL(sb)->j_trans_max) {
2050 reiserfs_warning(sb, "journal-2018",
2051 "Bad transaction length %d "
2052 "encountered, ignoring transaction",
2053 get_desc_trans_len(desc));
2054 return -1;
2055 }
2056 offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2057
2058 /*
2059 * ok, we have a journal description block,
2060 * let's see if the transaction was valid
2061 */
2062 c_bh =
2063 journal_bread(sb,
2064 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2065 ((offset + get_desc_trans_len(desc) +
2066 1) % SB_ONDISK_JOURNAL_SIZE(sb)));
2067 if (!c_bh)
2068 return 0;
2069 commit = (struct reiserfs_journal_commit *)c_bh->b_data;
2070 if (journal_compare_desc_commit(sb, desc, commit)) {
2071 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2072 "journal_transaction_is_valid, commit offset %ld had bad "
2073 "time %d or length %d",
2074 c_bh->b_blocknr -
2075 SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2076 get_commit_trans_id(commit),
2077 get_commit_trans_len(commit));
2078 brelse(c_bh);
2079 if (oldest_invalid_trans_id) {
2080 *oldest_invalid_trans_id =
2081 get_desc_trans_id(desc);
2082 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2083 "journal-1004: "
2084 "transaction_is_valid setting oldest invalid trans_id "
2085 "to %d",
2086 get_desc_trans_id(desc));
2087 }
2088 return -1;
2089 }
2090 brelse(c_bh);
2091 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2092 "journal-1006: found valid "
2093 "transaction start offset %llu, len %d id %d",
2094 d_bh->b_blocknr -
2095 SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2096 get_desc_trans_len(desc),
2097 get_desc_trans_id(desc));
2098 return 1;
2099 } else {
2100 return 0;
2101 }
2102 }
2103
2104 static void brelse_array(struct buffer_head **heads, int num)
2105 {
2106 int i;
2107 for (i = 0; i < num; i++) {
2108 brelse(heads[i]);
2109 }
2110 }
2111
2112 /*
2113 * given the start, and values for the oldest acceptable transactions,
2114 * this either reads in a replays a transaction, or returns because the
2115 * transaction is invalid, or too old.
2116 * NOTE: only called during fs mount
2117 */
2118 static int journal_read_transaction(struct super_block *sb,
2119 unsigned long cur_dblock,
2120 unsigned long oldest_start,
2121 unsigned int oldest_trans_id,
2122 unsigned long newest_mount_id)
2123 {
2124 struct reiserfs_journal *journal = SB_JOURNAL(sb);
2125 struct reiserfs_journal_desc *desc;
2126 struct reiserfs_journal_commit *commit;
2127 unsigned int trans_id = 0;
2128 struct buffer_head *c_bh;
2129 struct buffer_head *d_bh;
2130 struct buffer_head **log_blocks = NULL;
2131 struct buffer_head **real_blocks = NULL;
2132 unsigned int trans_offset;
2133 int i;
2134 int trans_half;
2135
2136 d_bh = journal_bread(sb, cur_dblock);
2137 if (!d_bh)
2138 return 1;
2139 desc = (struct reiserfs_journal_desc *)d_bh->b_data;
2140 trans_offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2141 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1037: "
2142 "journal_read_transaction, offset %llu, len %d mount_id %d",
2143 d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2144 get_desc_trans_len(desc), get_desc_mount_id(desc));
2145 if (get_desc_trans_id(desc) < oldest_trans_id) {
2146 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1039: "
2147 "journal_read_trans skipping because %lu is too old",
2148 cur_dblock -
2149 SB_ONDISK_JOURNAL_1st_BLOCK(sb));
2150 brelse(d_bh);
2151 return 1;
2152 }
2153 if (get_desc_mount_id(desc) != newest_mount_id) {
2154 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1146: "
2155 "journal_read_trans skipping because %d is != "
2156 "newest_mount_id %lu", get_desc_mount_id(desc),
2157 newest_mount_id);
2158 brelse(d_bh);
2159 return 1;
2160 }
2161 c_bh = journal_bread(sb, SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2162 ((trans_offset + get_desc_trans_len(desc) + 1) %
2163 SB_ONDISK_JOURNAL_SIZE(sb)));
2164 if (!c_bh) {
2165 brelse(d_bh);
2166 return 1;
2167 }
2168 commit = (struct reiserfs_journal_commit *)c_bh->b_data;
2169 if (journal_compare_desc_commit(sb, desc, commit)) {
2170 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2171 "journal_read_transaction, "
2172 "commit offset %llu had bad time %d or length %d",
2173 c_bh->b_blocknr -
2174 SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2175 get_commit_trans_id(commit),
2176 get_commit_trans_len(commit));
2177 brelse(c_bh);
2178 brelse(d_bh);
2179 return 1;
2180 }
2181
2182 if (bdev_read_only(sb->s_bdev)) {
2183 reiserfs_warning(sb, "clm-2076",
2184 "device is readonly, unable to replay log");
2185 brelse(c_bh);
2186 brelse(d_bh);
2187 return -EROFS;
2188 }
2189
2190 trans_id = get_desc_trans_id(desc);
2191 /*
2192 * now we know we've got a good transaction, and it was
2193 * inside the valid time ranges
2194 */
2195 log_blocks = kmalloc_array(get_desc_trans_len(desc),
2196 sizeof(struct buffer_head *),
2197 GFP_NOFS);
2198 real_blocks = kmalloc_array(get_desc_trans_len(desc),
2199 sizeof(struct buffer_head *),
2200 GFP_NOFS);
2201 if (!log_blocks || !real_blocks) {
2202 brelse(c_bh);
2203 brelse(d_bh);
2204 kfree(log_blocks);
2205 kfree(real_blocks);
2206 reiserfs_warning(sb, "journal-1169",
2207 "kmalloc failed, unable to mount FS");
2208 return -1;
2209 }
2210 /* get all the buffer heads */
2211 trans_half = journal_trans_half(sb->s_blocksize);
2212 for (i = 0; i < get_desc_trans_len(desc); i++) {
2213 log_blocks[i] =
2214 journal_getblk(sb,
2215 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2216 (trans_offset + 1 +
2217 i) % SB_ONDISK_JOURNAL_SIZE(sb));
2218 if (i < trans_half) {
2219 real_blocks[i] =
2220 sb_getblk(sb,
2221 le32_to_cpu(desc->j_realblock[i]));
2222 } else {
2223 real_blocks[i] =
2224 sb_getblk(sb,
2225 le32_to_cpu(commit->
2226 j_realblock[i - trans_half]));
2227 }
2228 if (real_blocks[i]->b_blocknr > SB_BLOCK_COUNT(sb)) {
2229 reiserfs_warning(sb, "journal-1207",
2230 "REPLAY FAILURE fsck required! "
2231 "Block to replay is outside of "
2232 "filesystem");
2233 goto abort_replay;
2234 }
2235 /* make sure we don't try to replay onto log or reserved area */
2236 if (is_block_in_log_or_reserved_area
2237 (sb, real_blocks[i]->b_blocknr)) {
2238 reiserfs_warning(sb, "journal-1204",
2239 "REPLAY FAILURE fsck required! "
2240 "Trying to replay onto a log block");
2241 abort_replay:
2242 brelse_array(log_blocks, i);
2243 brelse_array(real_blocks, i);
2244 brelse(c_bh);
2245 brelse(d_bh);
2246 kfree(log_blocks);
2247 kfree(real_blocks);
2248 return -1;
2249 }
2250 }
2251 /* read in the log blocks, memcpy to the corresponding real block */
2252 ll_rw_block(REQ_OP_READ, 0, get_desc_trans_len(desc), log_blocks);
2253 for (i = 0; i < get_desc_trans_len(desc); i++) {
2254
2255 wait_on_buffer(log_blocks[i]);
2256 if (!buffer_uptodate(log_blocks[i])) {
2257 reiserfs_warning(sb, "journal-1212",
2258 "REPLAY FAILURE fsck required! "
2259 "buffer write failed");
2260 brelse_array(log_blocks + i,
2261 get_desc_trans_len(desc) - i);
2262 brelse_array(real_blocks, get_desc_trans_len(desc));
2263 brelse(c_bh);
2264 brelse(d_bh);
2265 kfree(log_blocks);
2266 kfree(real_blocks);
2267 return -1;
2268 }
2269 memcpy(real_blocks[i]->b_data, log_blocks[i]->b_data,
2270 real_blocks[i]->b_size);
2271 set_buffer_uptodate(real_blocks[i]);
2272 brelse(log_blocks[i]);
2273 }
2274 /* flush out the real blocks */
2275 for (i = 0; i < get_desc_trans_len(desc); i++) {
2276 set_buffer_dirty(real_blocks[i]);
2277 write_dirty_buffer(real_blocks[i], 0);
2278 }
2279 for (i = 0; i < get_desc_trans_len(desc); i++) {
2280 wait_on_buffer(real_blocks[i]);
2281 if (!buffer_uptodate(real_blocks[i])) {
2282 reiserfs_warning(sb, "journal-1226",
2283 "REPLAY FAILURE, fsck required! "
2284 "buffer write failed");
2285 brelse_array(real_blocks + i,
2286 get_desc_trans_len(desc) - i);
2287 brelse(c_bh);
2288 brelse(d_bh);
2289 kfree(log_blocks);
2290 kfree(real_blocks);
2291 return -1;
2292 }
2293 brelse(real_blocks[i]);
2294 }
2295 cur_dblock =
2296 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2297 ((trans_offset + get_desc_trans_len(desc) +
2298 2) % SB_ONDISK_JOURNAL_SIZE(sb));
2299 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2300 "journal-1095: setting journal " "start to offset %ld",
2301 cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb));
2302
2303 /*
2304 * init starting values for the first transaction, in case
2305 * this is the last transaction to be replayed.
2306 */
2307 journal->j_start = cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2308 journal->j_last_flush_trans_id = trans_id;
2309 journal->j_trans_id = trans_id + 1;
2310 /* check for trans_id overflow */
2311 if (journal->j_trans_id == 0)
2312 journal->j_trans_id = 10;
2313 brelse(c_bh);
2314 brelse(d_bh);
2315 kfree(log_blocks);
2316 kfree(real_blocks);
2317 return 0;
2318 }
2319
2320 /*
2321 * This function reads blocks starting from block and to max_block of bufsize
2322 * size (but no more than BUFNR blocks at a time). This proved to improve
2323 * mounting speed on self-rebuilding raid5 arrays at least.
2324 * Right now it is only used from journal code. But later we might use it
2325 * from other places.
2326 * Note: Do not use journal_getblk/sb_getblk functions here!
2327 */
2328 static struct buffer_head *reiserfs_breada(struct block_device *dev,
2329 b_blocknr_t block, int bufsize,
2330 b_blocknr_t max_block)
2331 {
2332 struct buffer_head *bhlist[BUFNR];
2333 unsigned int blocks = BUFNR;
2334 struct buffer_head *bh;
2335 int i, j;
2336
2337 bh = __getblk(dev, block, bufsize);
2338 if (buffer_uptodate(bh))
2339 return (bh);
2340
2341 if (block + BUFNR > max_block) {
2342 blocks = max_block - block;
2343 }
2344 bhlist[0] = bh;
2345 j = 1;
2346 for (i = 1; i < blocks; i++) {
2347 bh = __getblk(dev, block + i, bufsize);
2348 if (buffer_uptodate(bh)) {
2349 brelse(bh);
2350 break;
2351 } else
2352 bhlist[j++] = bh;
2353 }
2354 ll_rw_block(REQ_OP_READ, 0, j, bhlist);
2355 for (i = 1; i < j; i++)
2356 brelse(bhlist[i]);
2357 bh = bhlist[0];
2358 wait_on_buffer(bh);
2359 if (buffer_uptodate(bh))
2360 return bh;
2361 brelse(bh);
2362 return NULL;
2363 }
2364
2365 /*
2366 * read and replay the log
2367 * on a clean unmount, the journal header's next unflushed pointer will be
2368 * to an invalid transaction. This tests that before finding all the
2369 * transactions in the log, which makes normal mount times fast.
2370 *
2371 * After a crash, this starts with the next unflushed transaction, and
2372 * replays until it finds one too old, or invalid.
2373 *
2374 * On exit, it sets things up so the first transaction will work correctly.
2375 * NOTE: only called during fs mount
2376 */
2377 static int journal_read(struct super_block *sb)
2378 {
2379 struct reiserfs_journal *journal = SB_JOURNAL(sb);
2380 struct reiserfs_journal_desc *desc;
2381 unsigned int oldest_trans_id = 0;
2382 unsigned int oldest_invalid_trans_id = 0;
2383 time_t start;
2384 unsigned long oldest_start = 0;
2385 unsigned long cur_dblock = 0;
2386 unsigned long newest_mount_id = 9;
2387 struct buffer_head *d_bh;
2388 struct reiserfs_journal_header *jh;
2389 int valid_journal_header = 0;
2390 int replay_count = 0;
2391 int continue_replay = 1;
2392 int ret;
2393
2394 cur_dblock = SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2395 reiserfs_info(sb, "checking transaction log (%pg)\n",
2396 journal->j_dev_bd);
2397 start = get_seconds();
2398
2399 /*
2400 * step 1, read in the journal header block. Check the transaction
2401 * it says is the first unflushed, and if that transaction is not
2402 * valid, replay is done
2403 */
2404 journal->j_header_bh = journal_bread(sb,
2405 SB_ONDISK_JOURNAL_1st_BLOCK(sb)
2406 + SB_ONDISK_JOURNAL_SIZE(sb));
2407 if (!journal->j_header_bh) {
2408 return 1;
2409 }
2410 jh = (struct reiserfs_journal_header *)(journal->j_header_bh->b_data);
2411 if (le32_to_cpu(jh->j_first_unflushed_offset) <
2412 SB_ONDISK_JOURNAL_SIZE(sb)
2413 && le32_to_cpu(jh->j_last_flush_trans_id) > 0) {
2414 oldest_start =
2415 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2416 le32_to_cpu(jh->j_first_unflushed_offset);
2417 oldest_trans_id = le32_to_cpu(jh->j_last_flush_trans_id) + 1;
2418 newest_mount_id = le32_to_cpu(jh->j_mount_id);
2419 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2420 "journal-1153: found in "
2421 "header: first_unflushed_offset %d, last_flushed_trans_id "
2422 "%lu", le32_to_cpu(jh->j_first_unflushed_offset),
2423 le32_to_cpu(jh->j_last_flush_trans_id));
2424 valid_journal_header = 1;
2425
2426 /*
2427 * now, we try to read the first unflushed offset. If it
2428 * is not valid, there is nothing more we can do, and it
2429 * makes no sense to read through the whole log.
2430 */
2431 d_bh =
2432 journal_bread(sb,
2433 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2434 le32_to_cpu(jh->j_first_unflushed_offset));
2435 ret = journal_transaction_is_valid(sb, d_bh, NULL, NULL);
2436 if (!ret) {
2437 continue_replay = 0;
2438 }
2439 brelse(d_bh);
2440 goto start_log_replay;
2441 }
2442
2443 /*
2444 * ok, there are transactions that need to be replayed. start
2445 * with the first log block, find all the valid transactions, and
2446 * pick out the oldest.
2447 */
2448 while (continue_replay
2449 && cur_dblock <
2450 (SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2451 SB_ONDISK_JOURNAL_SIZE(sb))) {
2452 /*
2453 * Note that it is required for blocksize of primary fs
2454 * device and journal device to be the same
2455 */
2456 d_bh =
2457 reiserfs_breada(journal->j_dev_bd, cur_dblock,
2458 sb->s_blocksize,
2459 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2460 SB_ONDISK_JOURNAL_SIZE(sb));
2461 ret =
2462 journal_transaction_is_valid(sb, d_bh,
2463 &oldest_invalid_trans_id,
2464 &newest_mount_id);
2465 if (ret == 1) {
2466 desc = (struct reiserfs_journal_desc *)d_bh->b_data;
2467 if (oldest_start == 0) { /* init all oldest_ values */
2468 oldest_trans_id = get_desc_trans_id(desc);
2469 oldest_start = d_bh->b_blocknr;
2470 newest_mount_id = get_desc_mount_id(desc);
2471 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2472 "journal-1179: Setting "
2473 "oldest_start to offset %llu, trans_id %lu",
2474 oldest_start -
2475 SB_ONDISK_JOURNAL_1st_BLOCK
2476 (sb), oldest_trans_id);
2477 } else if (oldest_trans_id > get_desc_trans_id(desc)) {
2478 /* one we just read was older */
2479 oldest_trans_id = get_desc_trans_id(desc);
2480 oldest_start = d_bh->b_blocknr;
2481 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2482 "journal-1180: Resetting "
2483 "oldest_start to offset %lu, trans_id %lu",
2484 oldest_start -
2485 SB_ONDISK_JOURNAL_1st_BLOCK
2486 (sb), oldest_trans_id);
2487 }
2488 if (newest_mount_id < get_desc_mount_id(desc)) {
2489 newest_mount_id = get_desc_mount_id(desc);
2490 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2491 "journal-1299: Setting "
2492 "newest_mount_id to %d",
2493 get_desc_mount_id(desc));
2494 }
2495 cur_dblock += get_desc_trans_len(desc) + 2;
2496 } else {
2497 cur_dblock++;
2498 }
2499 brelse(d_bh);
2500 }
2501
2502 start_log_replay:
2503 cur_dblock = oldest_start;
2504 if (oldest_trans_id) {
2505 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2506 "journal-1206: Starting replay "
2507 "from offset %llu, trans_id %lu",
2508 cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2509 oldest_trans_id);
2510
2511 }
2512 replay_count = 0;
2513 while (continue_replay && oldest_trans_id > 0) {
2514 ret =
2515 journal_read_transaction(sb, cur_dblock, oldest_start,
2516 oldest_trans_id, newest_mount_id);
2517 if (ret < 0) {
2518 return ret;
2519 } else if (ret != 0) {
2520 break;
2521 }
2522 cur_dblock =
2523 SB_ONDISK_JOURNAL_1st_BLOCK(sb) + journal->j_start;
2524 replay_count++;
2525 if (cur_dblock == oldest_start)
2526 break;
2527 }
2528
2529 if (oldest_trans_id == 0) {
2530 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2531 "journal-1225: No valid " "transactions found");
2532 }
2533 /*
2534 * j_start does not get set correctly if we don't replay any
2535 * transactions. if we had a valid journal_header, set j_start
2536 * to the first unflushed transaction value, copy the trans_id
2537 * from the header
2538 */
2539 if (valid_journal_header && replay_count == 0) {
2540 journal->j_start = le32_to_cpu(jh->j_first_unflushed_offset);
2541 journal->j_trans_id =
2542 le32_to_cpu(jh->j_last_flush_trans_id) + 1;
2543 /* check for trans_id overflow */
2544 if (journal->j_trans_id == 0)
2545 journal->j_trans_id = 10;
2546 journal->j_last_flush_trans_id =
2547 le32_to_cpu(jh->j_last_flush_trans_id);
2548 journal->j_mount_id = le32_to_cpu(jh->j_mount_id) + 1;
2549 } else {
2550 journal->j_mount_id = newest_mount_id + 1;
2551 }
2552 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1299: Setting "
2553 "newest_mount_id to %lu", journal->j_mount_id);
2554 journal->j_first_unflushed_offset = journal->j_start;
2555 if (replay_count > 0) {
2556 reiserfs_info(sb,
2557 "replayed %d transactions in %lu seconds\n",
2558 replay_count, get_seconds() - start);
2559 }
2560 /* needed to satisfy the locking in _update_journal_header_block */
2561 reiserfs_write_lock(sb);
2562 if (!bdev_read_only(sb->s_bdev) &&
2563 _update_journal_header_block(sb, journal->j_start,
2564 journal->j_last_flush_trans_id)) {
2565 reiserfs_write_unlock(sb);
2566 /*
2567 * replay failed, caller must call free_journal_ram and abort
2568 * the mount
2569 */
2570 return -1;
2571 }
2572 reiserfs_write_unlock(sb);
2573 return 0;
2574 }
2575
2576 static struct reiserfs_journal_list *alloc_journal_list(struct super_block *s)
2577 {
2578 struct reiserfs_journal_list *jl;
2579 jl = kzalloc(sizeof(struct reiserfs_journal_list),
2580 GFP_NOFS | __GFP_NOFAIL);
2581 INIT_LIST_HEAD(&jl->j_list);
2582 INIT_LIST_HEAD(&jl->j_working_list);
2583 INIT_LIST_HEAD(&jl->j_tail_bh_list);
2584 INIT_LIST_HEAD(&jl->j_bh_list);
2585 mutex_init(&jl->j_commit_mutex);
2586 SB_JOURNAL(s)->j_num_lists++;
2587 get_journal_list(jl);
2588 return jl;
2589 }
2590
2591 static void journal_list_init(struct super_block *sb)
2592 {
2593 SB_JOURNAL(sb)->j_current_jl = alloc_journal_list(sb);
2594 }
2595
2596 static void release_journal_dev(struct super_block *super,
2597 struct reiserfs_journal *journal)
2598 {
2599 if (journal->j_dev_bd != NULL) {
2600 blkdev_put(journal->j_dev_bd, journal->j_dev_mode);
2601 journal->j_dev_bd = NULL;
2602 }
2603 }
2604
2605 static int journal_init_dev(struct super_block *super,
2606 struct reiserfs_journal *journal,
2607 const char *jdev_name)
2608 {
2609 int result;
2610 dev_t jdev;
2611 fmode_t blkdev_mode = FMODE_READ | FMODE_WRITE | FMODE_EXCL;
2612 char b[BDEVNAME_SIZE];
2613
2614 result = 0;
2615
2616 journal->j_dev_bd = NULL;
2617 jdev = SB_ONDISK_JOURNAL_DEVICE(super) ?
2618 new_decode_dev(SB_ONDISK_JOURNAL_DEVICE(super)) : super->s_dev;
2619
2620 if (bdev_read_only(super->s_bdev))
2621 blkdev_mode = FMODE_READ;
2622
2623 /* there is no "jdev" option and journal is on separate device */
2624 if ((!jdev_name || !jdev_name[0])) {
2625 if (jdev == super->s_dev)
2626 blkdev_mode &= ~FMODE_EXCL;
2627 journal->j_dev_bd = blkdev_get_by_dev(jdev, blkdev_mode,
2628 journal);
2629 journal->j_dev_mode = blkdev_mode;
2630 if (IS_ERR(journal->j_dev_bd)) {
2631 result = PTR_ERR(journal->j_dev_bd);
2632 journal->j_dev_bd = NULL;
2633 reiserfs_warning(super, "sh-458",
2634 "cannot init journal device '%s': %i",
2635 __bdevname(jdev, b), result);
2636 return result;
2637 } else if (jdev != super->s_dev)
2638 set_blocksize(journal->j_dev_bd, super->s_blocksize);
2639
2640 return 0;
2641 }
2642
2643 journal->j_dev_mode = blkdev_mode;
2644 journal->j_dev_bd = blkdev_get_by_path(jdev_name, blkdev_mode, journal);
2645 if (IS_ERR(journal->j_dev_bd)) {
2646 result = PTR_ERR(journal->j_dev_bd);
2647 journal->j_dev_bd = NULL;
2648 reiserfs_warning(super, "sh-457",
2649 "journal_init_dev: Cannot open '%s': %i",
2650 jdev_name, result);
2651 return result;
2652 }
2653
2654 set_blocksize(journal->j_dev_bd, super->s_blocksize);
2655 reiserfs_info(super,
2656 "journal_init_dev: journal device: %pg\n",
2657 journal->j_dev_bd);
2658 return 0;
2659 }
2660
2661 /*
2662 * When creating/tuning a file system user can assign some
2663 * journal params within boundaries which depend on the ratio
2664 * blocksize/standard_blocksize.
2665 *
2666 * For blocks >= standard_blocksize transaction size should
2667 * be not less then JOURNAL_TRANS_MIN_DEFAULT, and not more
2668 * then JOURNAL_TRANS_MAX_DEFAULT.
2669 *
2670 * For blocks < standard_blocksize these boundaries should be
2671 * decreased proportionally.
2672 */
2673 #define REISERFS_STANDARD_BLKSIZE (4096)
2674
2675 static int check_advise_trans_params(struct super_block *sb,
2676 struct reiserfs_journal *journal)
2677 {
2678 if (journal->j_trans_max) {
2679 /* Non-default journal params. Do sanity check for them. */
2680 int ratio = 1;
2681 if (sb->s_blocksize < REISERFS_STANDARD_BLKSIZE)
2682 ratio = REISERFS_STANDARD_BLKSIZE / sb->s_blocksize;
2683
2684 if (journal->j_trans_max > JOURNAL_TRANS_MAX_DEFAULT / ratio ||
2685 journal->j_trans_max < JOURNAL_TRANS_MIN_DEFAULT / ratio ||
2686 SB_ONDISK_JOURNAL_SIZE(sb) / journal->j_trans_max <
2687 JOURNAL_MIN_RATIO) {
2688 reiserfs_warning(sb, "sh-462",
2689 "bad transaction max size (%u). "
2690 "FSCK?", journal->j_trans_max);
2691 return 1;
2692 }
2693 if (journal->j_max_batch != (journal->j_trans_max) *
2694 JOURNAL_MAX_BATCH_DEFAULT/JOURNAL_TRANS_MAX_DEFAULT) {
2695 reiserfs_warning(sb, "sh-463",
2696 "bad transaction max batch (%u). "
2697 "FSCK?", journal->j_max_batch);
2698 return 1;
2699 }
2700 } else {
2701 /*
2702 * Default journal params.
2703 * The file system was created by old version
2704 * of mkreiserfs, so some fields contain zeros,
2705 * and we need to advise proper values for them
2706 */
2707 if (sb->s_blocksize != REISERFS_STANDARD_BLKSIZE) {
2708 reiserfs_warning(sb, "sh-464", "bad blocksize (%u)",
2709 sb->s_blocksize);
2710 return 1;
2711 }
2712 journal->j_trans_max = JOURNAL_TRANS_MAX_DEFAULT;
2713 journal->j_max_batch = JOURNAL_MAX_BATCH_DEFAULT;
2714 journal->j_max_commit_age = JOURNAL_MAX_COMMIT_AGE;
2715 }
2716 return 0;
2717 }
2718
2719 /* must be called once on fs mount. calls journal_read for you */
2720 int journal_init(struct super_block *sb, const char *j_dev_name,
2721 int old_format, unsigned int commit_max_age)
2722 {
2723 int num_cnodes = SB_ONDISK_JOURNAL_SIZE(sb) * 2;
2724 struct buffer_head *bhjh;
2725 struct reiserfs_super_block *rs;
2726 struct reiserfs_journal_header *jh;
2727 struct reiserfs_journal *journal;
2728 struct reiserfs_journal_list *jl;
2729 int ret;
2730
2731 journal = SB_JOURNAL(sb) = vzalloc(sizeof(struct reiserfs_journal));
2732 if (!journal) {
2733 reiserfs_warning(sb, "journal-1256",
2734 "unable to get memory for journal structure");
2735 return 1;
2736 }
2737 INIT_LIST_HEAD(&journal->j_bitmap_nodes);
2738 INIT_LIST_HEAD(&journal->j_prealloc_list);
2739 INIT_LIST_HEAD(&journal->j_working_list);
2740 INIT_LIST_HEAD(&journal->j_journal_list);
2741 journal->j_persistent_trans = 0;
2742 if (reiserfs_allocate_list_bitmaps(sb, journal->j_list_bitmap,
2743 reiserfs_bmap_count(sb)))
2744 goto free_and_return;
2745
2746 allocate_bitmap_nodes(sb);
2747
2748 /* reserved for journal area support */
2749 SB_JOURNAL_1st_RESERVED_BLOCK(sb) = (old_format ?
2750 REISERFS_OLD_DISK_OFFSET_IN_BYTES
2751 / sb->s_blocksize +
2752 reiserfs_bmap_count(sb) +
2753 1 :
2754 REISERFS_DISK_OFFSET_IN_BYTES /
2755 sb->s_blocksize + 2);
2756
2757 /*
2758 * Sanity check to see is the standard journal fitting
2759 * within first bitmap (actual for small blocksizes)
2760 */
2761 if (!SB_ONDISK_JOURNAL_DEVICE(sb) &&
2762 (SB_JOURNAL_1st_RESERVED_BLOCK(sb) +
2763 SB_ONDISK_JOURNAL_SIZE(sb) > sb->s_blocksize * 8)) {
2764 reiserfs_warning(sb, "journal-1393",
2765 "journal does not fit for area addressed "
2766 "by first of bitmap blocks. It starts at "
2767 "%u and its size is %u. Block size %ld",
2768 SB_JOURNAL_1st_RESERVED_BLOCK(sb),
2769 SB_ONDISK_JOURNAL_SIZE(sb),
2770 sb->s_blocksize);
2771 goto free_and_return;
2772 }
2773
2774 if (journal_init_dev(sb, journal, j_dev_name) != 0) {
2775 reiserfs_warning(sb, "sh-462",
2776 "unable to initialize journal device");
2777 goto free_and_return;
2778 }
2779
2780 rs = SB_DISK_SUPER_BLOCK(sb);
2781
2782 /* read journal header */
2783 bhjh = journal_bread(sb,
2784 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2785 SB_ONDISK_JOURNAL_SIZE(sb));
2786 if (!bhjh) {
2787 reiserfs_warning(sb, "sh-459",
2788 "unable to read journal header");
2789 goto free_and_return;
2790 }
2791 jh = (struct reiserfs_journal_header *)(bhjh->b_data);
2792
2793 /* make sure that journal matches to the super block */
2794 if (is_reiserfs_jr(rs)
2795 && (le32_to_cpu(jh->jh_journal.jp_journal_magic) !=
2796 sb_jp_journal_magic(rs))) {
2797 reiserfs_warning(sb, "sh-460",
2798 "journal header magic %x (device %pg) does "
2799 "not match to magic found in super block %x",
2800 jh->jh_journal.jp_journal_magic,
2801 journal->j_dev_bd,
2802 sb_jp_journal_magic(rs));
2803 brelse(bhjh);
2804 goto free_and_return;
2805 }
2806
2807 journal->j_trans_max = le32_to_cpu(jh->jh_journal.jp_journal_trans_max);
2808 journal->j_max_batch = le32_to_cpu(jh->jh_journal.jp_journal_max_batch);
2809 journal->j_max_commit_age =
2810 le32_to_cpu(jh->jh_journal.jp_journal_max_commit_age);
2811 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
2812
2813 if (check_advise_trans_params(sb, journal) != 0)
2814 goto free_and_return;
2815 journal->j_default_max_commit_age = journal->j_max_commit_age;
2816
2817 if (commit_max_age != 0) {
2818 journal->j_max_commit_age = commit_max_age;
2819 journal->j_max_trans_age = commit_max_age;
2820 }
2821
2822 reiserfs_info(sb, "journal params: device %pg, size %u, "
2823 "journal first block %u, max trans len %u, max batch %u, "
2824 "max commit age %u, max trans age %u\n",
2825 journal->j_dev_bd,
2826 SB_ONDISK_JOURNAL_SIZE(sb),
2827 SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2828 journal->j_trans_max,
2829 journal->j_max_batch,
2830 journal->j_max_commit_age, journal->j_max_trans_age);
2831
2832 brelse(bhjh);
2833
2834 journal->j_list_bitmap_index = 0;
2835 journal_list_init(sb);
2836
2837 memset(journal->j_list_hash_table, 0,
2838 JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *));
2839
2840 INIT_LIST_HEAD(&journal->j_dirty_buffers);
2841 spin_lock_init(&journal->j_dirty_buffers_lock);
2842
2843 journal->j_start = 0;
2844 journal->j_len = 0;
2845 journal->j_len_alloc = 0;
2846 atomic_set(&journal->j_wcount, 0);
2847 atomic_set(&journal->j_async_throttle, 0);
2848 journal->j_bcount = 0;
2849 journal->j_trans_start_time = 0;
2850 journal->j_last = NULL;
2851 journal->j_first = NULL;
2852 init_waitqueue_head(&journal->j_join_wait);
2853 mutex_init(&journal->j_mutex);
2854 mutex_init(&journal->j_flush_mutex);
2855
2856 journal->j_trans_id = 10;
2857 journal->j_mount_id = 10;
2858 journal->j_state = 0;
2859 atomic_set(&journal->j_jlock, 0);
2860 journal->j_cnode_free_list = allocate_cnodes(num_cnodes);
2861 journal->j_cnode_free_orig = journal->j_cnode_free_list;
2862 journal->j_cnode_free = journal->j_cnode_free_list ? num_cnodes : 0;
2863 journal->j_cnode_used = 0;
2864 journal->j_must_wait = 0;
2865
2866 if (journal->j_cnode_free == 0) {
2867 reiserfs_warning(sb, "journal-2004", "Journal cnode memory "
2868 "allocation failed (%ld bytes). Journal is "
2869 "too large for available memory. Usually "
2870 "this is due to a journal that is too large.",
2871 sizeof (struct reiserfs_journal_cnode) * num_cnodes);
2872 goto free_and_return;
2873 }
2874
2875 init_journal_hash(sb);
2876 jl = journal->j_current_jl;
2877
2878 /*
2879 * get_list_bitmap() may call flush_commit_list() which
2880 * requires the lock. Calling flush_commit_list() shouldn't happen
2881 * this early but I like to be paranoid.
2882 */
2883 reiserfs_write_lock(sb);
2884 jl->j_list_bitmap = get_list_bitmap(sb, jl);
2885 reiserfs_write_unlock(sb);
2886 if (!jl->j_list_bitmap) {
2887 reiserfs_warning(sb, "journal-2005",
2888 "get_list_bitmap failed for journal list 0");
2889 goto free_and_return;
2890 }
2891
2892 ret = journal_read(sb);
2893 if (ret < 0) {
2894 reiserfs_warning(sb, "reiserfs-2006",
2895 "Replay Failure, unable to mount");
2896 goto free_and_return;
2897 }
2898
2899 INIT_DELAYED_WORK(&journal->j_work, flush_async_commits);
2900 journal->j_work_sb = sb;
2901 return 0;
2902 free_and_return:
2903 free_journal_ram(sb);
2904 return 1;
2905 }
2906
2907 /*
2908 * test for a polite end of the current transaction. Used by file_write,
2909 * and should be used by delete to make sure they don't write more than
2910 * can fit inside a single transaction
2911 */
2912 int journal_transaction_should_end(struct reiserfs_transaction_handle *th,
2913 int new_alloc)
2914 {
2915 struct reiserfs_journal *journal = SB_JOURNAL(th->t_super);
2916 time_t now = get_seconds();
2917 /* cannot restart while nested */
2918 BUG_ON(!th->t_trans_id);
2919 if (th->t_refcount > 1)
2920 return 0;
2921 if (journal->j_must_wait > 0 ||
2922 (journal->j_len_alloc + new_alloc) >= journal->j_max_batch ||
2923 atomic_read(&journal->j_jlock) ||
2924 (now - journal->j_trans_start_time) > journal->j_max_trans_age ||
2925 journal->j_cnode_free < (journal->j_trans_max * 3)) {
2926 return 1;
2927 }
2928
2929 journal->j_len_alloc += new_alloc;
2930 th->t_blocks_allocated += new_alloc ;
2931 return 0;
2932 }
2933
2934 /* this must be called inside a transaction */
2935 void reiserfs_block_writes(struct reiserfs_transaction_handle *th)
2936 {
2937 struct reiserfs_journal *journal = SB_JOURNAL(th->t_super);
2938 BUG_ON(!th->t_trans_id);
2939 journal->j_must_wait = 1;
2940 set_bit(J_WRITERS_BLOCKED, &journal->j_state);
2941 return;
2942 }
2943
2944 /* this must be called without a transaction started */
2945 void reiserfs_allow_writes(struct super_block *s)
2946 {
2947 struct reiserfs_journal *journal = SB_JOURNAL(s);
2948 clear_bit(J_WRITERS_BLOCKED, &journal->j_state);
2949 wake_up(&journal->j_join_wait);
2950 }
2951
2952 /* this must be called without a transaction started */
2953 void reiserfs_wait_on_write_block(struct super_block *s)
2954 {
2955 struct reiserfs_journal *journal = SB_JOURNAL(s);
2956 wait_event(journal->j_join_wait,
2957 !test_bit(J_WRITERS_BLOCKED, &journal->j_state));
2958 }
2959
2960 static void queue_log_writer(struct super_block *s)
2961 {
2962 wait_queue_entry_t wait;
2963 struct reiserfs_journal *journal = SB_JOURNAL(s);
2964 set_bit(J_WRITERS_QUEUED, &journal->j_state);
2965
2966 /*
2967 * we don't want to use wait_event here because
2968 * we only want to wait once.
2969 */
2970 init_waitqueue_entry(&wait, current);
2971 add_wait_queue(&journal->j_join_wait, &wait);
2972 set_current_state(TASK_UNINTERRUPTIBLE);
2973 if (test_bit(J_WRITERS_QUEUED, &journal->j_state)) {
2974 int depth = reiserfs_write_unlock_nested(s);
2975 schedule();
2976 reiserfs_write_lock_nested(s, depth);
2977 }
2978 __set_current_state(TASK_RUNNING);
2979 remove_wait_queue(&journal->j_join_wait, &wait);
2980 }
2981
2982 static void wake_queued_writers(struct super_block *s)
2983 {
2984 struct reiserfs_journal *journal = SB_JOURNAL(s);
2985 if (test_and_clear_bit(J_WRITERS_QUEUED, &journal->j_state))
2986 wake_up(&journal->j_join_wait);
2987 }
2988
2989 static void let_transaction_grow(struct super_block *sb, unsigned int trans_id)
2990 {
2991 struct reiserfs_journal *journal = SB_JOURNAL(sb);
2992 unsigned long bcount = journal->j_bcount;
2993 while (1) {
2994 int depth;
2995
2996 depth = reiserfs_write_unlock_nested(sb);
2997 schedule_timeout_uninterruptible(1);
2998 reiserfs_write_lock_nested(sb, depth);
2999
3000 journal->j_current_jl->j_state |= LIST_COMMIT_PENDING;
3001 while ((atomic_read(&journal->j_wcount) > 0 ||
3002 atomic_read(&journal->j_jlock)) &&
3003 journal->j_trans_id == trans_id) {
3004 queue_log_writer(sb);
3005 }
3006 if (journal->j_trans_id != trans_id)
3007 break;
3008 if (bcount == journal->j_bcount)
3009 break;
3010 bcount = journal->j_bcount;
3011 }
3012 }
3013
3014 /*
3015 * join == true if you must join an existing transaction.
3016 * join == false if you can deal with waiting for others to finish
3017 *
3018 * this will block until the transaction is joinable. send the number of
3019 * blocks you expect to use in nblocks.
3020 */
3021 static int do_journal_begin_r(struct reiserfs_transaction_handle *th,
3022 struct super_block *sb, unsigned long nblocks,
3023 int join)
3024 {
3025 time_t now = get_seconds();
3026 unsigned int old_trans_id;
3027 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3028 struct reiserfs_transaction_handle myth;
3029 int sched_count = 0;
3030 int retval;
3031 int depth;
3032
3033 reiserfs_check_lock_depth(sb, "journal_begin");
3034 BUG_ON(nblocks > journal->j_trans_max);
3035
3036 PROC_INFO_INC(sb, journal.journal_being);
3037 /* set here for journal_join */
3038 th->t_refcount = 1;
3039 th->t_super = sb;
3040
3041 relock:
3042 lock_journal(sb);
3043 if (join != JBEGIN_ABORT && reiserfs_is_journal_aborted(journal)) {
3044 unlock_journal(sb);
3045 retval = journal->j_errno;
3046 goto out_fail;
3047 }
3048 journal->j_bcount++;
3049
3050 if (test_bit(J_WRITERS_BLOCKED, &journal->j_state)) {
3051 unlock_journal(sb);
3052 depth = reiserfs_write_unlock_nested(sb);
3053 reiserfs_wait_on_write_block(sb);
3054 reiserfs_write_lock_nested(sb, depth);
3055 PROC_INFO_INC(sb, journal.journal_relock_writers);
3056 goto relock;
3057 }
3058 now = get_seconds();
3059
3060 /*
3061 * if there is no room in the journal OR
3062 * if this transaction is too old, and we weren't called joinable,
3063 * wait for it to finish before beginning we don't sleep if there
3064 * aren't other writers
3065 */
3066
3067 if ((!join && journal->j_must_wait > 0) ||
3068 (!join
3069 && (journal->j_len_alloc + nblocks + 2) >= journal->j_max_batch)
3070 || (!join && atomic_read(&journal->j_wcount) > 0
3071 && journal->j_trans_start_time > 0
3072 && (now - journal->j_trans_start_time) >
3073 journal->j_max_trans_age) || (!join
3074 && atomic_read(&journal->j_jlock))
3075 || (!join && journal->j_cnode_free < (journal->j_trans_max * 3))) {
3076
3077 old_trans_id = journal->j_trans_id;
3078 /* allow others to finish this transaction */
3079 unlock_journal(sb);
3080
3081 if (!join && (journal->j_len_alloc + nblocks + 2) >=
3082 journal->j_max_batch &&
3083 ((journal->j_len + nblocks + 2) * 100) <
3084 (journal->j_len_alloc * 75)) {
3085 if (atomic_read(&journal->j_wcount) > 10) {
3086 sched_count++;
3087 queue_log_writer(sb);
3088 goto relock;
3089 }
3090 }
3091 /*
3092 * don't mess with joining the transaction if all we
3093 * have to do is wait for someone else to do a commit
3094 */
3095 if (atomic_read(&journal->j_jlock)) {
3096 while (journal->j_trans_id == old_trans_id &&
3097 atomic_read(&journal->j_jlock)) {
3098 queue_log_writer(sb);
3099 }
3100 goto relock;
3101 }
3102 retval = journal_join(&myth, sb);
3103 if (retval)
3104 goto out_fail;
3105
3106 /* someone might have ended the transaction while we joined */
3107 if (old_trans_id != journal->j_trans_id) {
3108 retval = do_journal_end(&myth, 0);
3109 } else {
3110 retval = do_journal_end(&myth, COMMIT_NOW);
3111 }
3112
3113 if (retval)
3114 goto out_fail;
3115
3116 PROC_INFO_INC(sb, journal.journal_relock_wcount);
3117 goto relock;
3118 }
3119 /* we are the first writer, set trans_id */
3120 if (journal->j_trans_start_time == 0) {
3121 journal->j_trans_start_time = get_seconds();
3122 }
3123 atomic_inc(&journal->j_wcount);
3124 journal->j_len_alloc += nblocks;
3125 th->t_blocks_logged = 0;
3126 th->t_blocks_allocated = nblocks;
3127 th->t_trans_id = journal->j_trans_id;
3128 unlock_journal(sb);
3129 INIT_LIST_HEAD(&th->t_list);
3130 return 0;
3131
3132 out_fail:
3133 memset(th, 0, sizeof(*th));
3134 /*
3135 * Re-set th->t_super, so we can properly keep track of how many
3136 * persistent transactions there are. We need to do this so if this
3137 * call is part of a failed restart_transaction, we can free it later
3138 */
3139 th->t_super = sb;
3140 return retval;
3141 }
3142
3143 struct reiserfs_transaction_handle *reiserfs_persistent_transaction(struct
3144 super_block
3145 *s,
3146 int nblocks)
3147 {
3148 int ret;
3149 struct reiserfs_transaction_handle *th;
3150
3151 /*
3152 * if we're nesting into an existing transaction. It will be
3153 * persistent on its own
3154 */
3155 if (reiserfs_transaction_running(s)) {
3156 th = current->journal_info;
3157 th->t_refcount++;
3158 BUG_ON(th->t_refcount < 2);
3159
3160 return th;
3161 }
3162 th = kmalloc(sizeof(struct reiserfs_transaction_handle), GFP_NOFS);
3163 if (!th)
3164 return NULL;
3165 ret = journal_begin(th, s, nblocks);
3166 if (ret) {
3167 kfree(th);
3168 return NULL;
3169 }
3170
3171 SB_JOURNAL(s)->j_persistent_trans++;
3172 return th;
3173 }
3174
3175 int reiserfs_end_persistent_transaction(struct reiserfs_transaction_handle *th)
3176 {
3177 struct super_block *s = th->t_super;
3178 int ret = 0;
3179 if (th->t_trans_id)
3180 ret = journal_end(th);
3181 else
3182 ret = -EIO;
3183 if (th->t_refcount == 0) {
3184 SB_JOURNAL(s)->j_persistent_trans--;
3185 kfree(th);
3186 }
3187 return ret;
3188 }
3189
3190 static int journal_join(struct reiserfs_transaction_handle *th,
3191 struct super_block *sb)
3192 {
3193 struct reiserfs_transaction_handle *cur_th = current->journal_info;
3194
3195 /*
3196 * this keeps do_journal_end from NULLing out the
3197 * current->journal_info pointer
3198 */
3199 th->t_handle_save = cur_th;
3200 BUG_ON(cur_th && cur_th->t_refcount > 1);
3201 return do_journal_begin_r(th, sb, 1, JBEGIN_JOIN);
3202 }
3203
3204 int journal_join_abort(struct reiserfs_transaction_handle *th,
3205 struct super_block *sb)
3206 {
3207 struct reiserfs_transaction_handle *cur_th = current->journal_info;
3208
3209 /*
3210 * this keeps do_journal_end from NULLing out the
3211 * current->journal_info pointer
3212 */
3213 th->t_handle_save = cur_th;
3214 BUG_ON(cur_th && cur_th->t_refcount > 1);
3215 return do_journal_begin_r(th, sb, 1, JBEGIN_ABORT);
3216 }
3217
3218 int journal_begin(struct reiserfs_transaction_handle *th,
3219 struct super_block *sb, unsigned long nblocks)
3220 {
3221 struct reiserfs_transaction_handle *cur_th = current->journal_info;
3222 int ret;
3223
3224 th->t_handle_save = NULL;
3225 if (cur_th) {
3226 /* we are nesting into the current transaction */
3227 if (cur_th->t_super == sb) {
3228 BUG_ON(!cur_th->t_refcount);
3229 cur_th->t_refcount++;
3230 memcpy(th, cur_th, sizeof(*th));
3231 if (th->t_refcount <= 1)
3232 reiserfs_warning(sb, "reiserfs-2005",
3233 "BAD: refcount <= 1, but "
3234 "journal_info != 0");
3235 return 0;
3236 } else {
3237 /*
3238 * we've ended up with a handle from a different
3239 * filesystem. save it and restore on journal_end.
3240 * This should never really happen...
3241 */
3242 reiserfs_warning(sb, "clm-2100",
3243 "nesting info a different FS");
3244 th->t_handle_save = current->journal_info;
3245 current->journal_info = th;
3246 }
3247 } else {
3248 current->journal_info = th;
3249 }
3250 ret = do_journal_begin_r(th, sb, nblocks, JBEGIN_REG);
3251 BUG_ON(current->journal_info != th);
3252
3253 /*
3254 * I guess this boils down to being the reciprocal of clm-2100 above.
3255 * If do_journal_begin_r fails, we need to put it back, since
3256 * journal_end won't be called to do it. */
3257 if (ret)
3258 current->journal_info = th->t_handle_save;
3259 else
3260 BUG_ON(!th->t_refcount);
3261
3262 return ret;
3263 }
3264
3265 /*
3266 * puts bh into the current transaction. If it was already there, reorders
3267 * removes the old pointers from the hash, and puts new ones in (to make
3268 * sure replay happen in the right order).
3269 *
3270 * if it was dirty, cleans and files onto the clean list. I can't let it
3271 * be dirty again until the transaction is committed.
3272 *
3273 * if j_len, is bigger than j_len_alloc, it pushes j_len_alloc to 10 + j_len.
3274 */
3275 int journal_mark_dirty(struct reiserfs_transaction_handle *th,
3276 struct buffer_head *bh)
3277 {
3278 struct super_block *sb = th->t_super;
3279 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3280 struct reiserfs_journal_cnode *cn = NULL;
3281 int count_already_incd = 0;
3282 int prepared = 0;
3283 BUG_ON(!th->t_trans_id);
3284
3285 PROC_INFO_INC(sb, journal.mark_dirty);
3286 if (th->t_trans_id != journal->j_trans_id) {
3287 reiserfs_panic(th->t_super, "journal-1577",
3288 "handle trans id %ld != current trans id %ld",
3289 th->t_trans_id, journal->j_trans_id);
3290 }
3291
3292 prepared = test_clear_buffer_journal_prepared(bh);
3293 clear_buffer_journal_restore_dirty(bh);
3294 /* already in this transaction, we are done */
3295 if (buffer_journaled(bh)) {
3296 PROC_INFO_INC(sb, journal.mark_dirty_already);
3297 return 0;
3298 }
3299
3300 /*
3301 * this must be turned into a panic instead of a warning. We can't
3302 * allow a dirty or journal_dirty or locked buffer to be logged, as
3303 * some changes could get to disk too early. NOT GOOD.
3304 */
3305 if (!prepared || buffer_dirty(bh)) {
3306 reiserfs_warning(sb, "journal-1777",
3307 "buffer %llu bad state "
3308 "%cPREPARED %cLOCKED %cDIRTY %cJDIRTY_WAIT",
3309 (unsigned long long)bh->b_blocknr,
3310 prepared ? ' ' : '!',
3311 buffer_locked(bh) ? ' ' : '!',
3312 buffer_dirty(bh) ? ' ' : '!',
3313 buffer_journal_dirty(bh) ? ' ' : '!');
3314 }
3315
3316 if (atomic_read(&journal->j_wcount) <= 0) {
3317 reiserfs_warning(sb, "journal-1409",
3318 "returning because j_wcount was %d",
3319 atomic_read(&journal->j_wcount));
3320 return 1;
3321 }
3322 /*
3323 * this error means I've screwed up, and we've overflowed
3324 * the transaction. Nothing can be done here, except make the
3325 * FS readonly or panic.
3326 */
3327 if (journal->j_len >= journal->j_trans_max) {
3328 reiserfs_panic(th->t_super, "journal-1413",
3329 "j_len (%lu) is too big",
3330 journal->j_len);
3331 }
3332
3333 if (buffer_journal_dirty(bh)) {
3334 count_already_incd = 1;
3335 PROC_INFO_INC(sb, journal.mark_dirty_notjournal);
3336 clear_buffer_journal_dirty(bh);
3337 }
3338
3339 if (journal->j_len > journal->j_len_alloc) {
3340 journal->j_len_alloc = journal->j_len + JOURNAL_PER_BALANCE_CNT;
3341 }
3342
3343 set_buffer_journaled(bh);
3344
3345 /* now put this guy on the end */
3346 if (!cn) {
3347 cn = get_cnode(sb);
3348 if (!cn) {
3349 reiserfs_panic(sb, "journal-4", "get_cnode failed!");
3350 }
3351
3352 if (th->t_blocks_logged == th->t_blocks_allocated) {
3353 th->t_blocks_allocated += JOURNAL_PER_BALANCE_CNT;
3354 journal->j_len_alloc += JOURNAL_PER_BALANCE_CNT;
3355 }
3356 th->t_blocks_logged++;
3357 journal->j_len++;
3358
3359 cn->bh = bh;
3360 cn->blocknr = bh->b_blocknr;
3361 cn->sb = sb;
3362 cn->jlist = NULL;
3363 insert_journal_hash(journal->j_hash_table, cn);
3364 if (!count_already_incd) {
3365 get_bh(bh);
3366 }
3367 }
3368 cn->next = NULL;
3369 cn->prev = journal->j_last;
3370 cn->bh = bh;
3371 if (journal->j_last) {
3372 journal->j_last->next = cn;
3373 journal->j_last = cn;
3374 } else {
3375 journal->j_first = cn;
3376 journal->j_last = cn;
3377 }
3378 reiserfs_schedule_old_flush(sb);
3379 return 0;
3380 }
3381
3382 int journal_end(struct reiserfs_transaction_handle *th)
3383 {
3384 struct super_block *sb = th->t_super;
3385 if (!current->journal_info && th->t_refcount > 1)
3386 reiserfs_warning(sb, "REISER-NESTING",
3387 "th NULL, refcount %d", th->t_refcount);
3388
3389 if (!th->t_trans_id) {
3390 WARN_ON(1);
3391 return -EIO;
3392 }
3393
3394 th->t_refcount--;
3395 if (th->t_refcount > 0) {
3396 struct reiserfs_transaction_handle *cur_th =
3397 current->journal_info;
3398
3399 /*
3400 * we aren't allowed to close a nested transaction on a
3401 * different filesystem from the one in the task struct
3402 */
3403 BUG_ON(cur_th->t_super != th->t_super);
3404
3405 if (th != cur_th) {
3406 memcpy(current->journal_info, th, sizeof(*th));
3407 th->t_trans_id = 0;
3408 }
3409 return 0;
3410 } else {
3411 return do_journal_end(th, 0);
3412 }
3413 }
3414
3415 /*
3416 * removes from the current transaction, relsing and descrementing any counters.
3417 * also files the removed buffer directly onto the clean list
3418 *
3419 * called by journal_mark_freed when a block has been deleted
3420 *
3421 * returns 1 if it cleaned and relsed the buffer. 0 otherwise
3422 */
3423 static int remove_from_transaction(struct super_block *sb,
3424 b_blocknr_t blocknr, int already_cleaned)
3425 {
3426 struct buffer_head *bh;
3427 struct reiserfs_journal_cnode *cn;
3428 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3429 int ret = 0;
3430
3431 cn = get_journal_hash_dev(sb, journal->j_hash_table, blocknr);
3432 if (!cn || !cn->bh) {
3433 return ret;
3434 }
3435 bh = cn->bh;
3436 if (cn->prev) {
3437 cn->prev->next = cn->next;
3438 }
3439 if (cn->next) {
3440 cn->next->prev = cn->prev;
3441 }
3442 if (cn == journal->j_first) {
3443 journal->j_first = cn->next;
3444 }
3445 if (cn == journal->j_last) {
3446 journal->j_last = cn->prev;
3447 }
3448 if (bh)
3449 remove_journal_hash(sb, journal->j_hash_table, NULL,
3450 bh->b_blocknr, 0);
3451 clear_buffer_journaled(bh); /* don't log this one */
3452
3453 if (!already_cleaned) {
3454 clear_buffer_journal_dirty(bh);
3455 clear_buffer_dirty(bh);
3456 clear_buffer_journal_test(bh);
3457 put_bh(bh);
3458 if (atomic_read(&bh->b_count) < 0) {
3459 reiserfs_warning(sb, "journal-1752",
3460 "b_count < 0");
3461 }
3462 ret = 1;
3463 }
3464 journal->j_len--;
3465 journal->j_len_alloc--;
3466 free_cnode(sb, cn);
3467 return ret;
3468 }
3469
3470 /*
3471 * for any cnode in a journal list, it can only be dirtied of all the
3472 * transactions that include it are committed to disk.
3473 * this checks through each transaction, and returns 1 if you are allowed
3474 * to dirty, and 0 if you aren't
3475 *
3476 * it is called by dirty_journal_list, which is called after
3477 * flush_commit_list has gotten all the log blocks for a given
3478 * transaction on disk
3479 *
3480 */
3481 static int can_dirty(struct reiserfs_journal_cnode *cn)
3482 {
3483 struct super_block *sb = cn->sb;
3484 b_blocknr_t blocknr = cn->blocknr;
3485 struct reiserfs_journal_cnode *cur = cn->hprev;
3486 int can_dirty = 1;
3487
3488 /*
3489 * first test hprev. These are all newer than cn, so any node here
3490 * with the same block number and dev means this node can't be sent
3491 * to disk right now.
3492 */
3493 while (cur && can_dirty) {
3494 if (cur->jlist && cur->bh && cur->blocknr && cur->sb == sb &&
3495 cur->blocknr == blocknr) {
3496 can_dirty = 0;
3497 }
3498 cur = cur->hprev;
3499 }
3500 /*
3501 * then test hnext. These are all older than cn. As long as they
3502 * are committed to the log, it is safe to write cn to disk
3503 */
3504 cur = cn->hnext;
3505 while (cur && can_dirty) {
3506 if (cur->jlist && cur->jlist->j_len > 0 &&
3507 atomic_read(&cur->jlist->j_commit_left) > 0 && cur->bh &&
3508 cur->blocknr && cur->sb == sb && cur->blocknr == blocknr) {
3509 can_dirty = 0;
3510 }
3511 cur = cur->hnext;
3512 }
3513 return can_dirty;
3514 }
3515
3516 /*
3517 * syncs the commit blocks, but does not force the real buffers to disk
3518 * will wait until the current transaction is done/committed before returning
3519 */
3520 int journal_end_sync(struct reiserfs_transaction_handle *th)
3521 {
3522 struct super_block *sb = th->t_super;
3523 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3524
3525 BUG_ON(!th->t_trans_id);
3526 /* you can sync while nested, very, very bad */
3527 BUG_ON(th->t_refcount > 1);
3528 if (journal->j_len == 0) {
3529 reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
3530 1);
3531 journal_mark_dirty(th, SB_BUFFER_WITH_SB(sb));
3532 }
3533 return do_journal_end(th, COMMIT_NOW | WAIT);
3534 }
3535
3536 /* writeback the pending async commits to disk */
3537 static void flush_async_commits(struct work_struct *work)
3538 {
3539 struct reiserfs_journal *journal =
3540 container_of(work, struct reiserfs_journal, j_work.work);
3541 struct super_block *sb = journal->j_work_sb;
3542 struct reiserfs_journal_list *jl;
3543 struct list_head *entry;
3544
3545 reiserfs_write_lock(sb);
3546 if (!list_empty(&journal->j_journal_list)) {
3547 /* last entry is the youngest, commit it and you get everything */
3548 entry = journal->j_journal_list.prev;
3549 jl = JOURNAL_LIST_ENTRY(entry);
3550 flush_commit_list(sb, jl, 1);
3551 }
3552 reiserfs_write_unlock(sb);
3553 }
3554
3555 /*
3556 * flushes any old transactions to disk
3557 * ends the current transaction if it is too old
3558 */
3559 void reiserfs_flush_old_commits(struct super_block *sb)
3560 {
3561 time_t now;
3562 struct reiserfs_transaction_handle th;
3563 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3564
3565 now = get_seconds();
3566 /*
3567 * safety check so we don't flush while we are replaying the log during
3568 * mount
3569 */
3570 if (list_empty(&journal->j_journal_list))
3571 return;
3572
3573 /*
3574 * check the current transaction. If there are no writers, and it is
3575 * too old, finish it, and force the commit blocks to disk
3576 */
3577 if (atomic_read(&journal->j_wcount) <= 0 &&
3578 journal->j_trans_start_time > 0 &&
3579 journal->j_len > 0 &&
3580 (now - journal->j_trans_start_time) > journal->j_max_trans_age) {
3581 if (!journal_join(&th, sb)) {
3582 reiserfs_prepare_for_journal(sb,
3583 SB_BUFFER_WITH_SB(sb),
3584 1);
3585 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(sb));
3586
3587 /*
3588 * we're only being called from kreiserfsd, it makes
3589 * no sense to do an async commit so that kreiserfsd
3590 * can do it later
3591 */
3592 do_journal_end(&th, COMMIT_NOW | WAIT);
3593 }
3594 }
3595 }
3596
3597 /*
3598 * returns 0 if do_journal_end should return right away, returns 1 if
3599 * do_journal_end should finish the commit
3600 *
3601 * if the current transaction is too old, but still has writers, this will
3602 * wait on j_join_wait until all the writers are done. By the time it
3603 * wakes up, the transaction it was called has already ended, so it just
3604 * flushes the commit list and returns 0.
3605 *
3606 * Won't batch when flush or commit_now is set. Also won't batch when
3607 * others are waiting on j_join_wait.
3608 *
3609 * Note, we can't allow the journal_end to proceed while there are still
3610 * writers in the log.
3611 */
3612 static int check_journal_end(struct reiserfs_transaction_handle *th, int flags)
3613 {
3614
3615 time_t now;
3616 int flush = flags & FLUSH_ALL;
3617 int commit_now = flags & COMMIT_NOW;
3618 int wait_on_commit = flags & WAIT;
3619 struct reiserfs_journal_list *jl;
3620 struct super_block *sb = th->t_super;
3621 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3622
3623 BUG_ON(!th->t_trans_id);
3624
3625 if (th->t_trans_id != journal->j_trans_id) {
3626 reiserfs_panic(th->t_super, "journal-1577",
3627 "handle trans id %ld != current trans id %ld",
3628 th->t_trans_id, journal->j_trans_id);
3629 }
3630
3631 journal->j_len_alloc -= (th->t_blocks_allocated - th->t_blocks_logged);
3632 /* <= 0 is allowed. unmounting might not call begin */
3633 if (atomic_read(&journal->j_wcount) > 0)
3634 atomic_dec(&journal->j_wcount);
3635
3636 /*
3637 * BUG, deal with case where j_len is 0, but people previously
3638 * freed blocks need to be released will be dealt with by next
3639 * transaction that actually writes something, but should be taken
3640 * care of in this trans
3641 */
3642 BUG_ON(journal->j_len == 0);
3643
3644 /*
3645 * if wcount > 0, and we are called to with flush or commit_now,
3646 * we wait on j_join_wait. We will wake up when the last writer has
3647 * finished the transaction, and started it on its way to the disk.
3648 * Then, we flush the commit or journal list, and just return 0
3649 * because the rest of journal end was already done for this
3650 * transaction.
3651 */
3652 if (atomic_read(&journal->j_wcount) > 0) {
3653 if (flush || commit_now) {
3654 unsigned trans_id;
3655
3656 jl = journal->j_current_jl;
3657 trans_id = jl->j_trans_id;
3658 if (wait_on_commit)
3659 jl->j_state |= LIST_COMMIT_PENDING;
3660 atomic_set(&journal->j_jlock, 1);
3661 if (flush) {
3662 journal->j_next_full_flush = 1;
3663 }
3664 unlock_journal(sb);
3665
3666 /*
3667 * sleep while the current transaction is
3668 * still j_jlocked
3669 */
3670 while (journal->j_trans_id == trans_id) {
3671 if (atomic_read(&journal->j_jlock)) {
3672 queue_log_writer(sb);
3673 } else {
3674 lock_journal(sb);
3675 if (journal->j_trans_id == trans_id) {
3676 atomic_set(&journal->j_jlock,
3677 1);
3678 }
3679 unlock_journal(sb);
3680 }
3681 }
3682 BUG_ON(journal->j_trans_id == trans_id);
3683
3684 if (commit_now
3685 && journal_list_still_alive(sb, trans_id)
3686 && wait_on_commit) {
3687 flush_commit_list(sb, jl, 1);
3688 }
3689 return 0;
3690 }
3691 unlock_journal(sb);
3692 return 0;
3693 }
3694
3695 /* deal with old transactions where we are the last writers */
3696 now = get_seconds();
3697 if ((now - journal->j_trans_start_time) > journal->j_max_trans_age) {
3698 commit_now = 1;
3699 journal->j_next_async_flush = 1;
3700 }
3701 /* don't batch when someone is waiting on j_join_wait */
3702 /* don't batch when syncing the commit or flushing the whole trans */
3703 if (!(journal->j_must_wait > 0) && !(atomic_read(&journal->j_jlock))
3704 && !flush && !commit_now && (journal->j_len < journal->j_max_batch)
3705 && journal->j_len_alloc < journal->j_max_batch
3706 && journal->j_cnode_free > (journal->j_trans_max * 3)) {
3707 journal->j_bcount++;
3708 unlock_journal(sb);
3709 return 0;
3710 }
3711
3712 if (journal->j_start > SB_ONDISK_JOURNAL_SIZE(sb)) {
3713 reiserfs_panic(sb, "journal-003",
3714 "j_start (%ld) is too high",
3715 journal->j_start);
3716 }
3717 return 1;
3718 }
3719
3720 /*
3721 * Does all the work that makes deleting blocks safe.
3722 * when deleting a block mark BH_JNew, just remove it from the current
3723 * transaction, clean it's buffer_head and move on.
3724 *
3725 * otherwise:
3726 * set a bit for the block in the journal bitmap. That will prevent it from
3727 * being allocated for unformatted nodes before this transaction has finished.
3728 *
3729 * mark any cnodes for this block as BLOCK_FREED, and clear their bh pointers.
3730 * That will prevent any old transactions with this block from trying to flush
3731 * to the real location. Since we aren't removing the cnode from the
3732 * journal_list_hash, *the block can't be reallocated yet.
3733 *
3734 * Then remove it from the current transaction, decrementing any counters and
3735 * filing it on the clean list.
3736 */
3737 int journal_mark_freed(struct reiserfs_transaction_handle *th,
3738 struct super_block *sb, b_blocknr_t blocknr)
3739 {
3740 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3741 struct reiserfs_journal_cnode *cn = NULL;
3742 struct buffer_head *bh = NULL;
3743 struct reiserfs_list_bitmap *jb = NULL;
3744 int cleaned = 0;
3745 BUG_ON(!th->t_trans_id);
3746
3747 cn = get_journal_hash_dev(sb, journal->j_hash_table, blocknr);
3748 if (cn && cn->bh) {
3749 bh = cn->bh;
3750 get_bh(bh);
3751 }
3752 /* if it is journal new, we just remove it from this transaction */
3753 if (bh && buffer_journal_new(bh)) {
3754 clear_buffer_journal_new(bh);
3755 clear_prepared_bits(bh);
3756 reiserfs_clean_and_file_buffer(bh);
3757 cleaned = remove_from_transaction(sb, blocknr, cleaned);
3758 } else {
3759 /*
3760 * set the bit for this block in the journal bitmap
3761 * for this transaction
3762 */
3763 jb = journal->j_current_jl->j_list_bitmap;
3764 if (!jb) {
3765 reiserfs_panic(sb, "journal-1702",
3766 "journal_list_bitmap is NULL");
3767 }
3768 set_bit_in_list_bitmap(sb, blocknr, jb);
3769
3770 /* Note, the entire while loop is not allowed to schedule. */
3771
3772 if (bh) {
3773 clear_prepared_bits(bh);
3774 reiserfs_clean_and_file_buffer(bh);
3775 }
3776 cleaned = remove_from_transaction(sb, blocknr, cleaned);
3777
3778 /*
3779 * find all older transactions with this block,
3780 * make sure they don't try to write it out
3781 */
3782 cn = get_journal_hash_dev(sb, journal->j_list_hash_table,
3783 blocknr);
3784 while (cn) {
3785 if (sb == cn->sb && blocknr == cn->blocknr) {
3786 set_bit(BLOCK_FREED, &cn->state);
3787 if (cn->bh) {
3788 /*
3789 * remove_from_transaction will brelse
3790 * the buffer if it was in the current
3791 * trans
3792 */
3793 if (!cleaned) {
3794 clear_buffer_journal_dirty(cn->
3795 bh);
3796 clear_buffer_dirty(cn->bh);
3797 clear_buffer_journal_test(cn->
3798 bh);
3799 cleaned = 1;
3800 put_bh(cn->bh);
3801 if (atomic_read
3802 (&cn->bh->b_count) < 0) {
3803 reiserfs_warning(sb,
3804 "journal-2138",
3805 "cn->bh->b_count < 0");
3806 }
3807 }
3808 /*
3809 * since we are clearing the bh,
3810 * we MUST dec nonzerolen
3811 */
3812 if (cn->jlist) {
3813 atomic_dec(&cn->jlist->
3814 j_nonzerolen);
3815 }
3816 cn->bh = NULL;
3817 }
3818 }
3819 cn = cn->hnext;
3820 }
3821 }
3822
3823 if (bh)
3824 release_buffer_page(bh); /* get_hash grabs the buffer */
3825 return 0;
3826 }
3827
3828 void reiserfs_update_inode_transaction(struct inode *inode)
3829 {
3830 struct reiserfs_journal *journal = SB_JOURNAL(inode->i_sb);
3831 REISERFS_I(inode)->i_jl = journal->j_current_jl;
3832 REISERFS_I(inode)->i_trans_id = journal->j_trans_id;
3833 }
3834
3835 /*
3836 * returns -1 on error, 0 if no commits/barriers were done and 1
3837 * if a transaction was actually committed and the barrier was done
3838 */
3839 static int __commit_trans_jl(struct inode *inode, unsigned long id,
3840 struct reiserfs_journal_list *jl)
3841 {
3842 struct reiserfs_transaction_handle th;
3843 struct super_block *sb = inode->i_sb;
3844 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3845 int ret = 0;
3846
3847 /*
3848 * is it from the current transaction,
3849 * or from an unknown transaction?
3850 */
3851 if (id == journal->j_trans_id) {
3852 jl = journal->j_current_jl;
3853 /*
3854 * try to let other writers come in and
3855 * grow this transaction
3856 */
3857 let_transaction_grow(sb, id);
3858 if (journal->j_trans_id != id) {
3859 goto flush_commit_only;
3860 }
3861
3862 ret = journal_begin(&th, sb, 1);
3863 if (ret)
3864 return ret;
3865
3866 /* someone might have ended this transaction while we joined */
3867 if (journal->j_trans_id != id) {
3868 reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
3869 1);
3870 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(sb));
3871 ret = journal_end(&th);
3872 goto flush_commit_only;
3873 }
3874
3875 ret = journal_end_sync(&th);
3876 if (!ret)
3877 ret = 1;
3878
3879 } else {
3880 /*
3881 * this gets tricky, we have to make sure the journal list in
3882 * the inode still exists. We know the list is still around
3883 * if we've got a larger transaction id than the oldest list
3884 */
3885 flush_commit_only:
3886 if (journal_list_still_alive(inode->i_sb, id)) {
3887 /*
3888 * we only set ret to 1 when we know for sure
3889 * the barrier hasn't been started yet on the commit
3890 * block.
3891 */
3892 if (atomic_read(&jl->j_commit_left) > 1)
3893 ret = 1;
3894 flush_commit_list(sb, jl, 1);
3895 if (journal->j_errno)
3896 ret = journal->j_errno;
3897 }
3898 }
3899 /* otherwise the list is gone, and long since committed */
3900 return ret;
3901 }
3902
3903 int reiserfs_commit_for_inode(struct inode *inode)
3904 {
3905 unsigned int id = REISERFS_I(inode)->i_trans_id;
3906 struct reiserfs_journal_list *jl = REISERFS_I(inode)->i_jl;
3907
3908 /*
3909 * for the whole inode, assume unset id means it was
3910 * changed in the current transaction. More conservative
3911 */
3912 if (!id || !jl) {
3913 reiserfs_update_inode_transaction(inode);
3914 id = REISERFS_I(inode)->i_trans_id;
3915 /* jl will be updated in __commit_trans_jl */
3916 }
3917
3918 return __commit_trans_jl(inode, id, jl);
3919 }
3920
3921 void reiserfs_restore_prepared_buffer(struct super_block *sb,
3922 struct buffer_head *bh)
3923 {
3924 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3925 PROC_INFO_INC(sb, journal.restore_prepared);
3926 if (!bh) {
3927 return;
3928 }
3929 if (test_clear_buffer_journal_restore_dirty(bh) &&
3930 buffer_journal_dirty(bh)) {
3931 struct reiserfs_journal_cnode *cn;
3932 reiserfs_write_lock(sb);
3933 cn = get_journal_hash_dev(sb,
3934 journal->j_list_hash_table,
3935 bh->b_blocknr);
3936 if (cn && can_dirty(cn)) {
3937 set_buffer_journal_test(bh);
3938 mark_buffer_dirty(bh);
3939 }
3940 reiserfs_write_unlock(sb);
3941 }
3942 clear_buffer_journal_prepared(bh);
3943 }
3944
3945 extern struct tree_balance *cur_tb;
3946 /*
3947 * before we can change a metadata block, we have to make sure it won't
3948 * be written to disk while we are altering it. So, we must:
3949 * clean it
3950 * wait on it.
3951 */
3952 int reiserfs_prepare_for_journal(struct super_block *sb,
3953 struct buffer_head *bh, int wait)
3954 {
3955 PROC_INFO_INC(sb, journal.prepare);
3956
3957 if (!trylock_buffer(bh)) {
3958 if (!wait)
3959 return 0;
3960 lock_buffer(bh);
3961 }
3962 set_buffer_journal_prepared(bh);
3963 if (test_clear_buffer_dirty(bh) && buffer_journal_dirty(bh)) {
3964 clear_buffer_journal_test(bh);
3965 set_buffer_journal_restore_dirty(bh);
3966 }
3967 unlock_buffer(bh);
3968 return 1;
3969 }
3970
3971 /*
3972 * long and ugly. If flush, will not return until all commit
3973 * blocks and all real buffers in the trans are on disk.
3974 * If no_async, won't return until all commit blocks are on disk.
3975 *
3976 * keep reading, there are comments as you go along
3977 *
3978 * If the journal is aborted, we just clean up. Things like flushing
3979 * journal lists, etc just won't happen.
3980 */
3981 static int do_journal_end(struct reiserfs_transaction_handle *th, int flags)
3982 {
3983 struct super_block *sb = th->t_super;
3984 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3985 struct reiserfs_journal_cnode *cn, *next, *jl_cn;
3986 struct reiserfs_journal_cnode *last_cn = NULL;
3987 struct reiserfs_journal_desc *desc;
3988 struct reiserfs_journal_commit *commit;
3989 struct buffer_head *c_bh; /* commit bh */
3990 struct buffer_head *d_bh; /* desc bh */
3991 int cur_write_start = 0; /* start index of current log write */
3992 int old_start;
3993 int i;
3994 int flush;
3995 int wait_on_commit;
3996 struct reiserfs_journal_list *jl, *temp_jl;
3997 struct list_head *entry, *safe;
3998 unsigned long jindex;
3999 unsigned int commit_trans_id;
4000 int trans_half;
4001 int depth;
4002
4003 BUG_ON(th->t_refcount > 1);
4004 BUG_ON(!th->t_trans_id);
4005 BUG_ON(!th->t_super);
4006
4007 /*
4008 * protect flush_older_commits from doing mistakes if the
4009 * transaction ID counter gets overflowed.
4010 */
4011 if (th->t_trans_id == ~0U)
4012 flags |= FLUSH_ALL | COMMIT_NOW | WAIT;
4013 flush = flags & FLUSH_ALL;
4014 wait_on_commit = flags & WAIT;
4015
4016 current->journal_info = th->t_handle_save;
4017 reiserfs_check_lock_depth(sb, "journal end");
4018 if (journal->j_len == 0) {
4019 reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
4020 1);
4021 journal_mark_dirty(th, SB_BUFFER_WITH_SB(sb));
4022 }
4023
4024 lock_journal(sb);
4025 if (journal->j_next_full_flush) {
4026 flags |= FLUSH_ALL;
4027 flush = 1;
4028 }
4029 if (journal->j_next_async_flush) {
4030 flags |= COMMIT_NOW | WAIT;
4031 wait_on_commit = 1;
4032 }
4033
4034 /*
4035 * check_journal_end locks the journal, and unlocks if it does
4036 * not return 1 it tells us if we should continue with the
4037 * journal_end, or just return
4038 */
4039 if (!check_journal_end(th, flags)) {
4040 reiserfs_schedule_old_flush(sb);
4041 wake_queued_writers(sb);
4042 reiserfs_async_progress_wait(sb);
4043 goto out;
4044 }
4045
4046 /* check_journal_end might set these, check again */
4047 if (journal->j_next_full_flush) {
4048 flush = 1;
4049 }
4050
4051 /*
4052 * j must wait means we have to flush the log blocks, and the
4053 * real blocks for this transaction
4054 */
4055 if (journal->j_must_wait > 0) {
4056 flush = 1;
4057 }
4058 #ifdef REISERFS_PREALLOCATE
4059 /*
4060 * quota ops might need to nest, setup the journal_info pointer
4061 * for them and raise the refcount so that it is > 0.
4062 */
4063 current->journal_info = th;
4064 th->t_refcount++;
4065
4066 /* it should not involve new blocks into the transaction */
4067 reiserfs_discard_all_prealloc(th);
4068
4069 th->t_refcount--;
4070 current->journal_info = th->t_handle_save;
4071 #endif
4072
4073 /* setup description block */
4074 d_bh =
4075 journal_getblk(sb,
4076 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
4077 journal->j_start);
4078 set_buffer_uptodate(d_bh);
4079 desc = (struct reiserfs_journal_desc *)(d_bh)->b_data;
4080 memset(d_bh->b_data, 0, d_bh->b_size);
4081 memcpy(get_journal_desc_magic(d_bh), JOURNAL_DESC_MAGIC, 8);
4082 set_desc_trans_id(desc, journal->j_trans_id);
4083
4084 /*
4085 * setup commit block. Don't write (keep it clean too) this one
4086 * until after everyone else is written
4087 */
4088 c_bh = journal_getblk(sb, SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
4089 ((journal->j_start + journal->j_len +
4090 1) % SB_ONDISK_JOURNAL_SIZE(sb)));
4091 commit = (struct reiserfs_journal_commit *)c_bh->b_data;
4092 memset(c_bh->b_data, 0, c_bh->b_size);
4093 set_commit_trans_id(commit, journal->j_trans_id);
4094 set_buffer_uptodate(c_bh);
4095
4096 /* init this journal list */
4097 jl = journal->j_current_jl;
4098
4099 /*
4100 * we lock the commit before doing anything because
4101 * we want to make sure nobody tries to run flush_commit_list until
4102 * the new transaction is fully setup, and we've already flushed the
4103 * ordered bh list
4104 */
4105 reiserfs_mutex_lock_safe(&jl->j_commit_mutex, sb);
4106
4107 /* save the transaction id in case we need to commit it later */
4108 commit_trans_id = jl->j_trans_id;
4109
4110 atomic_set(&jl->j_older_commits_done, 0);
4111 jl->j_trans_id = journal->j_trans_id;
4112 jl->j_timestamp = journal->j_trans_start_time;
4113 jl->j_commit_bh = c_bh;
4114 jl->j_start = journal->j_start;
4115 jl->j_len = journal->j_len;
4116 atomic_set(&jl->j_nonzerolen, journal->j_len);
4117 atomic_set(&jl->j_commit_left, journal->j_len + 2);
4118 jl->j_realblock = NULL;
4119
4120 /*
4121 * The ENTIRE FOR LOOP MUST not cause schedule to occur.
4122 * for each real block, add it to the journal list hash,
4123 * copy into real block index array in the commit or desc block
4124 */
4125 trans_half = journal_trans_half(sb->s_blocksize);
4126 for (i = 0, cn = journal->j_first; cn; cn = cn->next, i++) {
4127 if (buffer_journaled(cn->bh)) {
4128 jl_cn = get_cnode(sb);
4129 if (!jl_cn) {
4130 reiserfs_panic(sb, "journal-1676",
4131 "get_cnode returned NULL");
4132 }
4133 if (i == 0) {
4134 jl->j_realblock = jl_cn;
4135 }
4136 jl_cn->prev = last_cn;
4137 jl_cn->next = NULL;
4138 if (last_cn) {
4139 last_cn->next = jl_cn;
4140 }
4141 last_cn = jl_cn;
4142 /*
4143 * make sure the block we are trying to log
4144 * is not a block of journal or reserved area
4145 */
4146 if (is_block_in_log_or_reserved_area
4147 (sb, cn->bh->b_blocknr)) {
4148 reiserfs_panic(sb, "journal-2332",
4149 "Trying to log block %lu, "
4150 "which is a log block",
4151 cn->bh->b_blocknr);
4152 }
4153 jl_cn->blocknr = cn->bh->b_blocknr;
4154 jl_cn->state = 0;
4155 jl_cn->sb = sb;
4156 jl_cn->bh = cn->bh;
4157 jl_cn->jlist = jl;
4158 insert_journal_hash(journal->j_list_hash_table, jl_cn);
4159 if (i < trans_half) {
4160 desc->j_realblock[i] =
4161 cpu_to_le32(cn->bh->b_blocknr);
4162 } else {
4163 commit->j_realblock[i - trans_half] =
4164 cpu_to_le32(cn->bh->b_blocknr);
4165 }
4166 } else {
4167 i--;
4168 }
4169 }
4170 set_desc_trans_len(desc, journal->j_len);
4171 set_desc_mount_id(desc, journal->j_mount_id);
4172 set_desc_trans_id(desc, journal->j_trans_id);
4173 set_commit_trans_len(commit, journal->j_len);
4174
4175 /*
4176 * special check in case all buffers in the journal
4177 * were marked for not logging
4178 */
4179 BUG_ON(journal->j_len == 0);
4180
4181 /*
4182 * we're about to dirty all the log blocks, mark the description block
4183 * dirty now too. Don't mark the commit block dirty until all the
4184 * others are on disk
4185 */
4186 mark_buffer_dirty(d_bh);
4187
4188 /*
4189 * first data block is j_start + 1, so add one to
4190 * cur_write_start wherever you use it
4191 */
4192 cur_write_start = journal->j_start;
4193 cn = journal->j_first;
4194 jindex = 1; /* start at one so we don't get the desc again */
4195 while (cn) {
4196 clear_buffer_journal_new(cn->bh);
4197 /* copy all the real blocks into log area. dirty log blocks */
4198 if (buffer_journaled(cn->bh)) {
4199 struct buffer_head *tmp_bh;
4200 char *addr;
4201 struct page *page;
4202 tmp_bh =
4203 journal_getblk(sb,
4204 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
4205 ((cur_write_start +
4206 jindex) %
4207 SB_ONDISK_JOURNAL_SIZE(sb)));
4208 set_buffer_uptodate(tmp_bh);
4209 page = cn->bh->b_page;
4210 addr = kmap(page);
4211 memcpy(tmp_bh->b_data,
4212 addr + offset_in_page(cn->bh->b_data),
4213 cn->bh->b_size);
4214 kunmap(page);
4215 mark_buffer_dirty(tmp_bh);
4216 jindex++;
4217 set_buffer_journal_dirty(cn->bh);
4218 clear_buffer_journaled(cn->bh);
4219 } else {
4220 /*
4221 * JDirty cleared sometime during transaction.
4222 * don't log this one
4223 */
4224 reiserfs_warning(sb, "journal-2048",
4225 "BAD, buffer in journal hash, "
4226 "but not JDirty!");
4227 brelse(cn->bh);
4228 }
4229 next = cn->next;
4230 free_cnode(sb, cn);
4231 cn = next;
4232 reiserfs_cond_resched(sb);
4233 }
4234
4235 /*
4236 * we are done with both the c_bh and d_bh, but
4237 * c_bh must be written after all other commit blocks,
4238 * so we dirty/relse c_bh in flush_commit_list, with commit_left <= 1.
4239 */
4240
4241 journal->j_current_jl = alloc_journal_list(sb);
4242
4243 /* now it is safe to insert this transaction on the main list */
4244 list_add_tail(&jl->j_list, &journal->j_journal_list);
4245 list_add_tail(&jl->j_working_list, &journal->j_working_list);
4246 journal->j_num_work_lists++;
4247
4248 /* reset journal values for the next transaction */
4249 old_start = journal->j_start;
4250 journal->j_start =
4251 (journal->j_start + journal->j_len +
4252 2) % SB_ONDISK_JOURNAL_SIZE(sb);
4253 atomic_set(&journal->j_wcount, 0);
4254 journal->j_bcount = 0;
4255 journal->j_last = NULL;
4256 journal->j_first = NULL;
4257 journal->j_len = 0;
4258 journal->j_trans_start_time = 0;
4259 /* check for trans_id overflow */
4260 if (++journal->j_trans_id == 0)
4261 journal->j_trans_id = 10;
4262 journal->j_current_jl->j_trans_id = journal->j_trans_id;
4263 journal->j_must_wait = 0;
4264 journal->j_len_alloc = 0;
4265 journal->j_next_full_flush = 0;
4266 journal->j_next_async_flush = 0;
4267 init_journal_hash(sb);
4268
4269 /*
4270 * make sure reiserfs_add_jh sees the new current_jl before we
4271 * write out the tails
4272 */
4273 smp_mb();
4274
4275 /*
4276 * tail conversion targets have to hit the disk before we end the
4277 * transaction. Otherwise a later transaction might repack the tail
4278 * before this transaction commits, leaving the data block unflushed
4279 * and clean, if we crash before the later transaction commits, the
4280 * data block is lost.
4281 */
4282 if (!list_empty(&jl->j_tail_bh_list)) {
4283 depth = reiserfs_write_unlock_nested(sb);
4284 write_ordered_buffers(&journal->j_dirty_buffers_lock,
4285 journal, jl, &jl->j_tail_bh_list);
4286 reiserfs_write_lock_nested(sb, depth);
4287 }
4288 BUG_ON(!list_empty(&jl->j_tail_bh_list));
4289 mutex_unlock(&jl->j_commit_mutex);
4290
4291 /*
4292 * honor the flush wishes from the caller, simple commits can
4293 * be done outside the journal lock, they are done below
4294 *
4295 * if we don't flush the commit list right now, we put it into
4296 * the work queue so the people waiting on the async progress work
4297 * queue don't wait for this proc to flush journal lists and such.
4298 */
4299 if (flush) {
4300 flush_commit_list(sb, jl, 1);
4301 flush_journal_list(sb, jl, 1);
4302 } else if (!(jl->j_state & LIST_COMMIT_PENDING)) {
4303 /*
4304 * Avoid queueing work when sb is being shut down. Transaction
4305 * will be flushed on journal shutdown.
4306 */
4307 if (sb->s_flags & SB_ACTIVE)
4308 queue_delayed_work(REISERFS_SB(sb)->commit_wq,
4309 &journal->j_work, HZ / 10);
4310 }
4311
4312 /*
4313 * if the next transaction has any chance of wrapping, flush
4314 * transactions that might get overwritten. If any journal lists
4315 * are very old flush them as well.
4316 */
4317 first_jl:
4318 list_for_each_safe(entry, safe, &journal->j_journal_list) {
4319 temp_jl = JOURNAL_LIST_ENTRY(entry);
4320 if (journal->j_start <= temp_jl->j_start) {
4321 if ((journal->j_start + journal->j_trans_max + 1) >=
4322 temp_jl->j_start) {
4323 flush_used_journal_lists(sb, temp_jl);
4324 goto first_jl;
4325 } else if ((journal->j_start +
4326 journal->j_trans_max + 1) <
4327 SB_ONDISK_JOURNAL_SIZE(sb)) {
4328 /*
4329 * if we don't cross into the next
4330 * transaction and we don't wrap, there is
4331 * no way we can overlap any later transactions
4332 * break now
4333 */
4334 break;
4335 }
4336 } else if ((journal->j_start +
4337 journal->j_trans_max + 1) >
4338 SB_ONDISK_JOURNAL_SIZE(sb)) {
4339 if (((journal->j_start + journal->j_trans_max + 1) %
4340 SB_ONDISK_JOURNAL_SIZE(sb)) >=
4341 temp_jl->j_start) {
4342 flush_used_journal_lists(sb, temp_jl);
4343 goto first_jl;
4344 } else {
4345 /*
4346 * we don't overlap anything from out start
4347 * to the end of the log, and our wrapped
4348 * portion doesn't overlap anything at
4349 * the start of the log. We can break
4350 */
4351 break;
4352 }
4353 }
4354 }
4355
4356 journal->j_current_jl->j_list_bitmap =
4357 get_list_bitmap(sb, journal->j_current_jl);
4358
4359 if (!(journal->j_current_jl->j_list_bitmap)) {
4360 reiserfs_panic(sb, "journal-1996",
4361 "could not get a list bitmap");
4362 }
4363
4364 atomic_set(&journal->j_jlock, 0);
4365 unlock_journal(sb);
4366 /* wake up any body waiting to join. */
4367 clear_bit(J_WRITERS_QUEUED, &journal->j_state);
4368 wake_up(&journal->j_join_wait);
4369
4370 if (!flush && wait_on_commit &&
4371 journal_list_still_alive(sb, commit_trans_id)) {
4372 flush_commit_list(sb, jl, 1);
4373 }
4374 out:
4375 reiserfs_check_lock_depth(sb, "journal end2");
4376
4377 memset(th, 0, sizeof(*th));
4378 /*
4379 * Re-set th->t_super, so we can properly keep track of how many
4380 * persistent transactions there are. We need to do this so if this
4381 * call is part of a failed restart_transaction, we can free it later
4382 */
4383 th->t_super = sb;
4384
4385 return journal->j_errno;
4386 }
4387
4388 /* Send the file system read only and refuse new transactions */
4389 void reiserfs_abort_journal(struct super_block *sb, int errno)
4390 {
4391 struct reiserfs_journal *journal = SB_JOURNAL(sb);
4392 if (test_bit(J_ABORTED, &journal->j_state))
4393 return;
4394
4395 if (!journal->j_errno)
4396 journal->j_errno = errno;
4397
4398 sb->s_flags |= SB_RDONLY;
4399 set_bit(J_ABORTED, &journal->j_state);
4400
4401 #ifdef CONFIG_REISERFS_CHECK
4402 dump_stack();
4403 #endif
4404 }
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