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1/*
2** Write ahead logging implementation copyright Chris Mason 2000
3**
4** The background commits make this code very interrelated, and
5** overly complex. I need to rethink things a bit....The major players:
6**
7** journal_begin -- call with the number of blocks you expect to log.
8** If the current transaction is too
9** old, it will block until the current transaction is
10** finished, and then start a new one.
11** Usually, your transaction will get joined in with
12** previous ones for speed.
13**
14** journal_join -- same as journal_begin, but won't block on the current
15** transaction regardless of age. Don't ever call
16** this. Ever. There are only two places it should be
17** called from, and they are both inside this file.
18**
19** journal_mark_dirty -- adds blocks into this transaction. clears any flags
20** that might make them get sent to disk
21** and then marks them BH_JDirty. Puts the buffer head
22** into the current transaction hash.
23**
24** journal_end -- if the current transaction is batchable, it does nothing
25** otherwise, it could do an async/synchronous commit, or
26** a full flush of all log and real blocks in the
27** transaction.
28**
29** flush_old_commits -- if the current transaction is too old, it is ended and
30** commit blocks are sent to disk. Forces commit blocks
31** to disk for all backgrounded commits that have been
32** around too long.
33** -- Note, if you call this as an immediate flush from
34** from within kupdate, it will ignore the immediate flag
35*/
36
37#include <linux/time.h>
38#include <linux/semaphore.h>
39#include <linux/vmalloc.h>
40#include <linux/reiserfs_fs.h>
41#include <linux/kernel.h>
42#include <linux/errno.h>
43#include <linux/fcntl.h>
44#include <linux/stat.h>
45#include <linux/string.h>
46#include <linux/buffer_head.h>
47#include <linux/workqueue.h>
48#include <linux/writeback.h>
49#include <linux/blkdev.h>
50#include <linux/backing-dev.h>
51#include <linux/uaccess.h>
52#include <linux/slab.h>
53
54#include <asm/system.h>
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/* the number of mounted filesystems. This is used to decide when to
63** start and kill the commit workqueue
64*/
65static int reiserfs_mounted_fs_count;
66
67static struct workqueue_struct *commit_wq;
68
69#define JOURNAL_TRANS_HALF 1018 /* must be correct to keep the desc and commit
70 structs at 4k */
71#define BUFNR 64 /*read ahead */
72
73/* cnode stat bits. Move these into reiserfs_fs.h */
74
75#define BLOCK_FREED 2 /* this block was freed, and can't be written. */
76#define BLOCK_FREED_HOLDER 3 /* this block was freed during this transaction, and can't be written */
77
78#define BLOCK_NEEDS_FLUSH 4 /* used in flush_journal_list */
79#define BLOCK_DIRTIED 5
80
81/* journal list state bits */
82#define LIST_TOUCHED 1
83#define LIST_DIRTY 2
84#define LIST_COMMIT_PENDING 4 /* someone will commit this list */
85
86/* flags for do_journal_end */
87#define FLUSH_ALL 1 /* flush commit and real blocks */
88#define COMMIT_NOW 2 /* end and commit this transaction */
89#define WAIT 4 /* wait for the log blocks to hit the disk */
90
91static int do_journal_end(struct reiserfs_transaction_handle *,
92 struct super_block *, unsigned long nblocks,
93 int flags);
94static int flush_journal_list(struct super_block *s,
95 struct reiserfs_journal_list *jl, int flushall);
96static int flush_commit_list(struct super_block *s,
97 struct reiserfs_journal_list *jl, int flushall);
98static int can_dirty(struct reiserfs_journal_cnode *cn);
99static int journal_join(struct reiserfs_transaction_handle *th,
100 struct super_block *sb, unsigned long nblocks);
101static int release_journal_dev(struct super_block *super,
102 struct reiserfs_journal *journal);
103static int dirty_one_transaction(struct super_block *s,
104 struct reiserfs_journal_list *jl);
105static void flush_async_commits(struct work_struct *work);
106static void queue_log_writer(struct super_block *s);
107
108/* values for join in do_journal_begin_r */
109enum {
110 JBEGIN_REG = 0, /* regular journal begin */
111 JBEGIN_JOIN = 1, /* join the running transaction if at all possible */
112 JBEGIN_ABORT = 2, /* called from cleanup code, ignores aborted flag */
113};
114
115static int do_journal_begin_r(struct reiserfs_transaction_handle *th,
116 struct super_block *sb,
117 unsigned long nblocks, int join);
118
119static void init_journal_hash(struct super_block *sb)
120{
121 struct reiserfs_journal *journal = SB_JOURNAL(sb);
122 memset(journal->j_hash_table, 0,
123 JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *));
124}
125
126/*
127** clears BH_Dirty and sticks the buffer on the clean list. Called because I can't allow refile_buffer to
128** make schedule happen after I've freed a block. Look at remove_from_transaction and journal_mark_freed for
129** more details.
130*/
131static int reiserfs_clean_and_file_buffer(struct buffer_head *bh)
132{
133 if (bh) {
134 clear_buffer_dirty(bh);
135 clear_buffer_journal_test(bh);
136 }
137 return 0;
138}
139
140static struct reiserfs_bitmap_node *allocate_bitmap_node(struct super_block
141 *sb)
142{
143 struct reiserfs_bitmap_node *bn;
144 static int id;
145
146 bn = kmalloc(sizeof(struct reiserfs_bitmap_node), GFP_NOFS);
147 if (!bn) {
148 return NULL;
149 }
150 bn->data = kzalloc(sb->s_blocksize, GFP_NOFS);
151 if (!bn->data) {
152 kfree(bn);
153 return NULL;
154 }
155 bn->id = id++;
156 INIT_LIST_HEAD(&bn->list);
157 return bn;
158}
159
160static struct reiserfs_bitmap_node *get_bitmap_node(struct super_block *sb)
161{
162 struct reiserfs_journal *journal = SB_JOURNAL(sb);
163 struct reiserfs_bitmap_node *bn = NULL;
164 struct list_head *entry = journal->j_bitmap_nodes.next;
165
166 journal->j_used_bitmap_nodes++;
167 repeat:
168
169 if (entry != &journal->j_bitmap_nodes) {
170 bn = list_entry(entry, struct reiserfs_bitmap_node, list);
171 list_del(entry);
172 memset(bn->data, 0, sb->s_blocksize);
173 journal->j_free_bitmap_nodes--;
174 return bn;
175 }
176 bn = allocate_bitmap_node(sb);
177 if (!bn) {
178 yield();
179 goto repeat;
180 }
181 return bn;
182}
183static inline void free_bitmap_node(struct super_block *sb,
184 struct reiserfs_bitmap_node *bn)
185{
186 struct reiserfs_journal *journal = SB_JOURNAL(sb);
187 journal->j_used_bitmap_nodes--;
188 if (journal->j_free_bitmap_nodes > REISERFS_MAX_BITMAP_NODES) {
189 kfree(bn->data);
190 kfree(bn);
191 } else {
192 list_add(&bn->list, &journal->j_bitmap_nodes);
193 journal->j_free_bitmap_nodes++;
194 }
195}
196
197static void allocate_bitmap_nodes(struct super_block *sb)
198{
199 int i;
200 struct reiserfs_journal *journal = SB_JOURNAL(sb);
201 struct reiserfs_bitmap_node *bn = NULL;
202 for (i = 0; i < REISERFS_MIN_BITMAP_NODES; i++) {
203 bn = allocate_bitmap_node(sb);
204 if (bn) {
205 list_add(&bn->list, &journal->j_bitmap_nodes);
206 journal->j_free_bitmap_nodes++;
207 } else {
208 break; /* this is ok, we'll try again when more are needed */
209 }
210 }
211}
212
213static int set_bit_in_list_bitmap(struct super_block *sb,
214 b_blocknr_t block,
215 struct reiserfs_list_bitmap *jb)
216{
217 unsigned int bmap_nr = block / (sb->s_blocksize << 3);
218 unsigned int bit_nr = block % (sb->s_blocksize << 3);
219
220 if (!jb->bitmaps[bmap_nr]) {
221 jb->bitmaps[bmap_nr] = get_bitmap_node(sb);
222 }
223 set_bit(bit_nr, (unsigned long *)jb->bitmaps[bmap_nr]->data);
224 return 0;
225}
226
227static void cleanup_bitmap_list(struct super_block *sb,
228 struct reiserfs_list_bitmap *jb)
229{
230 int i;
231 if (jb->bitmaps == NULL)
232 return;
233
234 for (i = 0; i < reiserfs_bmap_count(sb); i++) {
235 if (jb->bitmaps[i]) {
236 free_bitmap_node(sb, jb->bitmaps[i]);
237 jb->bitmaps[i] = NULL;
238 }
239 }
240}
241
242/*
243** only call this on FS unmount.
244*/
245static int free_list_bitmaps(struct super_block *sb,
246 struct reiserfs_list_bitmap *jb_array)
247{
248 int i;
249 struct reiserfs_list_bitmap *jb;
250 for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
251 jb = jb_array + i;
252 jb->journal_list = NULL;
253 cleanup_bitmap_list(sb, jb);
254 vfree(jb->bitmaps);
255 jb->bitmaps = NULL;
256 }
257 return 0;
258}
259
260static int free_bitmap_nodes(struct super_block *sb)
261{
262 struct reiserfs_journal *journal = SB_JOURNAL(sb);
263 struct list_head *next = journal->j_bitmap_nodes.next;
264 struct reiserfs_bitmap_node *bn;
265
266 while (next != &journal->j_bitmap_nodes) {
267 bn = list_entry(next, struct reiserfs_bitmap_node, list);
268 list_del(next);
269 kfree(bn->data);
270 kfree(bn);
271 next = journal->j_bitmap_nodes.next;
272 journal->j_free_bitmap_nodes--;
273 }
274
275 return 0;
276}
277
278/*
279** get memory for JOURNAL_NUM_BITMAPS worth of bitmaps.
280** jb_array is the array to be filled in.
281*/
282int reiserfs_allocate_list_bitmaps(struct super_block *sb,
283 struct reiserfs_list_bitmap *jb_array,
284 unsigned int bmap_nr)
285{
286 int i;
287 int failed = 0;
288 struct reiserfs_list_bitmap *jb;
289 int mem = bmap_nr * sizeof(struct reiserfs_bitmap_node *);
290
291 for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
292 jb = jb_array + i;
293 jb->journal_list = NULL;
294 jb->bitmaps = vmalloc(mem);
295 if (!jb->bitmaps) {
296 reiserfs_warning(sb, "clm-2000", "unable to "
297 "allocate bitmaps for journal lists");
298 failed = 1;
299 break;
300 }
301 memset(jb->bitmaps, 0, mem);
302 }
303 if (failed) {
304 free_list_bitmaps(sb, jb_array);
305 return -1;
306 }
307 return 0;
308}
309
310/*
311** find an available list bitmap. If you can't find one, flush a commit list
312** and try again
313*/
314static struct reiserfs_list_bitmap *get_list_bitmap(struct super_block *sb,
315 struct reiserfs_journal_list
316 *jl)
317{
318 int i, j;
319 struct reiserfs_journal *journal = SB_JOURNAL(sb);
320 struct reiserfs_list_bitmap *jb = NULL;
321
322 for (j = 0; j < (JOURNAL_NUM_BITMAPS * 3); j++) {
323 i = journal->j_list_bitmap_index;
324 journal->j_list_bitmap_index = (i + 1) % JOURNAL_NUM_BITMAPS;
325 jb = journal->j_list_bitmap + i;
326 if (journal->j_list_bitmap[i].journal_list) {
327 flush_commit_list(sb,
328 journal->j_list_bitmap[i].
329 journal_list, 1);
330 if (!journal->j_list_bitmap[i].journal_list) {
331 break;
332 }
333 } else {
334 break;
335 }
336 }
337 if (jb->journal_list) { /* double check to make sure if flushed correctly */
338 return NULL;
339 }
340 jb->journal_list = jl;
341 return jb;
342}
343
344/*
345** allocates a new chunk of X nodes, and links them all together as a list.
346** Uses the cnode->next and cnode->prev pointers
347** returns NULL on failure
348*/
349static struct reiserfs_journal_cnode *allocate_cnodes(int num_cnodes)
350{
351 struct reiserfs_journal_cnode *head;
352 int i;
353 if (num_cnodes <= 0) {
354 return NULL;
355 }
356 head = vmalloc(num_cnodes * sizeof(struct reiserfs_journal_cnode));
357 if (!head) {
358 return NULL;
359 }
360 memset(head, 0, num_cnodes * sizeof(struct reiserfs_journal_cnode));
361 head[0].prev = NULL;
362 head[0].next = head + 1;
363 for (i = 1; i < num_cnodes; i++) {
364 head[i].prev = head + (i - 1);
365 head[i].next = head + (i + 1); /* if last one, overwrite it after the if */
366 }
367 head[num_cnodes - 1].next = NULL;
368 return head;
369}
370
371/*
372** pulls a cnode off the free list, or returns NULL on failure
373*/
374static struct reiserfs_journal_cnode *get_cnode(struct super_block *sb)
375{
376 struct reiserfs_journal_cnode *cn;
377 struct reiserfs_journal *journal = SB_JOURNAL(sb);
378
379 reiserfs_check_lock_depth(sb, "get_cnode");
380
381 if (journal->j_cnode_free <= 0) {
382 return NULL;
383 }
384 journal->j_cnode_used++;
385 journal->j_cnode_free--;
386 cn = journal->j_cnode_free_list;
387 if (!cn) {
388 return cn;
389 }
390 if (cn->next) {
391 cn->next->prev = NULL;
392 }
393 journal->j_cnode_free_list = cn->next;
394 memset(cn, 0, sizeof(struct reiserfs_journal_cnode));
395 return cn;
396}
397
398/*
399** returns a cnode to the free list
400*/
401static void free_cnode(struct super_block *sb,
402 struct reiserfs_journal_cnode *cn)
403{
404 struct reiserfs_journal *journal = SB_JOURNAL(sb);
405
406 reiserfs_check_lock_depth(sb, "free_cnode");
407
408 journal->j_cnode_used--;
409 journal->j_cnode_free++;
410 /* memset(cn, 0, sizeof(struct reiserfs_journal_cnode)) ; */
411 cn->next = journal->j_cnode_free_list;
412 if (journal->j_cnode_free_list) {
413 journal->j_cnode_free_list->prev = cn;
414 }
415 cn->prev = NULL; /* not needed with the memset, but I might kill the memset, and forget to do this */
416 journal->j_cnode_free_list = cn;
417}
418
419static void clear_prepared_bits(struct buffer_head *bh)
420{
421 clear_buffer_journal_prepared(bh);
422 clear_buffer_journal_restore_dirty(bh);
423}
424
425/* return a cnode with same dev, block number and size in table, or null if not found */
426static inline struct reiserfs_journal_cnode *get_journal_hash_dev(struct
427 super_block
428 *sb,
429 struct
430 reiserfs_journal_cnode
431 **table,
432 long bl)
433{
434 struct reiserfs_journal_cnode *cn;
435 cn = journal_hash(table, sb, bl);
436 while (cn) {
437 if (cn->blocknr == bl && cn->sb == sb)
438 return cn;
439 cn = cn->hnext;
440 }
441 return (struct reiserfs_journal_cnode *)0;
442}
443
444/*
445** this actually means 'can this block be reallocated yet?'. If you set search_all, a block can only be allocated
446** if it is not in the current transaction, was not freed by the current transaction, and has no chance of ever
447** being overwritten by a replay after crashing.
448**
449** If you don't set search_all, a block can only be allocated if it is not in the current transaction. Since deleting
450** a block removes it from the current transaction, this case should never happen. If you don't set search_all, make
451** sure you never write the block without logging it.
452**
453** next_zero_bit is a suggestion about the next block to try for find_forward.
454** when bl is rejected because it is set in a journal list bitmap, we search
455** for the next zero bit in the bitmap that rejected bl. Then, we return that
456** through next_zero_bit for find_forward to try.
457**
458** Just because we return something in next_zero_bit does not mean we won't
459** reject it on the next call to reiserfs_in_journal
460**
461*/
462int reiserfs_in_journal(struct super_block *sb,
463 unsigned int bmap_nr, int bit_nr, int search_all,
464 b_blocknr_t * next_zero_bit)
465{
466 struct reiserfs_journal *journal = SB_JOURNAL(sb);
467 struct reiserfs_journal_cnode *cn;
468 struct reiserfs_list_bitmap *jb;
469 int i;
470 unsigned long bl;
471
472 *next_zero_bit = 0; /* always start this at zero. */
473
474 PROC_INFO_INC(sb, journal.in_journal);
475 /* If we aren't doing a search_all, this is a metablock, and it will be logged before use.
476 ** if we crash before the transaction that freed it commits, this transaction won't
477 ** have committed either, and the block will never be written
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*/
519static inline void insert_journal_hash(struct reiserfs_journal_cnode **table,
520 struct reiserfs_journal_cnode *cn)
521{
522 struct reiserfs_journal_cnode *cn_orig;
523
524 cn_orig = journal_hash(table, cn->sb, cn->blocknr);
525 cn->hnext = cn_orig;
526 cn->hprev = NULL;
527 if (cn_orig) {
528 cn_orig->hprev = cn;
529 }
530 journal_hash(table, cn->sb, cn->blocknr) = cn;
531}
532
533/* lock the current transaction */
534static inline void lock_journal(struct super_block *sb)
535{
536 PROC_INFO_INC(sb, journal.lock_journal);
537
538 reiserfs_mutex_lock_safe(&SB_JOURNAL(sb)->j_mutex, sb);
539}
540
541/* unlock the current transaction */
542static inline void unlock_journal(struct super_block *sb)
543{
544 mutex_unlock(&SB_JOURNAL(sb)->j_mutex);
545}
546
547static inline void get_journal_list(struct reiserfs_journal_list *jl)
548{
549 jl->j_refcount++;
550}
551
552static inline void put_journal_list(struct super_block *s,
553 struct reiserfs_journal_list *jl)
554{
555 if (jl->j_refcount < 1) {
556 reiserfs_panic(s, "journal-2", "trans id %u, refcount at %d",
557 jl->j_trans_id, jl->j_refcount);
558 }
559 if (--jl->j_refcount == 0)
560 kfree(jl);
561}
562
563/*
564** this used to be much more involved, and I'm keeping it just in case things get ugly again.
565** it gets called by flush_commit_list, and cleans up any data stored about blocks freed during a
566** transaction.
567*/
568static void cleanup_freed_for_journal_list(struct super_block *sb,
569 struct reiserfs_journal_list *jl)
570{
571
572 struct reiserfs_list_bitmap *jb = jl->j_list_bitmap;
573 if (jb) {
574 cleanup_bitmap_list(sb, jb);
575 }
576 jl->j_list_bitmap->journal_list = NULL;
577 jl->j_list_bitmap = NULL;
578}
579
580static int journal_list_still_alive(struct super_block *s,
581 unsigned int trans_id)
582{
583 struct reiserfs_journal *journal = SB_JOURNAL(s);
584 struct list_head *entry = &journal->j_journal_list;
585 struct reiserfs_journal_list *jl;
586
587 if (!list_empty(entry)) {
588 jl = JOURNAL_LIST_ENTRY(entry->next);
589 if (jl->j_trans_id <= trans_id) {
590 return 1;
591 }
592 }
593 return 0;
594}
595
596/*
597 * If page->mapping was null, we failed to truncate this page for
598 * some reason. Most likely because it was truncated after being
599 * logged via data=journal.
600 *
601 * This does a check to see if the buffer belongs to one of these
602 * lost pages before doing the final put_bh. If page->mapping was
603 * null, it tries to free buffers on the page, which should make the
604 * final page_cache_release drop the page from the lru.
605 */
606static void release_buffer_page(struct buffer_head *bh)
607{
608 struct page *page = bh->b_page;
609 if (!page->mapping && trylock_page(page)) {
610 page_cache_get(page);
611 put_bh(bh);
612 if (!page->mapping)
613 try_to_free_buffers(page);
614 unlock_page(page);
615 page_cache_release(page);
616 } else {
617 put_bh(bh);
618 }
619}
620
621static void reiserfs_end_buffer_io_sync(struct buffer_head *bh, int uptodate)
622{
623 char b[BDEVNAME_SIZE];
624
625 if (buffer_journaled(bh)) {
626 reiserfs_warning(NULL, "clm-2084",
627 "pinned buffer %lu:%s sent to disk",
628 bh->b_blocknr, bdevname(bh->b_bdev, b));
629 }
630 if (uptodate)
631 set_buffer_uptodate(bh);
632 else
633 clear_buffer_uptodate(bh);
634
635 unlock_buffer(bh);
636 release_buffer_page(bh);
637}
638
639static void reiserfs_end_ordered_io(struct buffer_head *bh, int uptodate)
640{
641 if (uptodate)
642 set_buffer_uptodate(bh);
643 else
644 clear_buffer_uptodate(bh);
645 unlock_buffer(bh);
646 put_bh(bh);
647}
648
649static void submit_logged_buffer(struct buffer_head *bh)
650{
651 get_bh(bh);
652 bh->b_end_io = reiserfs_end_buffer_io_sync;
653 clear_buffer_journal_new(bh);
654 clear_buffer_dirty(bh);
655 if (!test_clear_buffer_journal_test(bh))
656 BUG();
657 if (!buffer_uptodate(bh))
658 BUG();
659 submit_bh(WRITE, bh);
660}
661
662static void submit_ordered_buffer(struct buffer_head *bh)
663{
664 get_bh(bh);
665 bh->b_end_io = reiserfs_end_ordered_io;
666 clear_buffer_dirty(bh);
667 if (!buffer_uptodate(bh))
668 BUG();
669 submit_bh(WRITE, bh);
670}
671
672#define CHUNK_SIZE 32
673struct buffer_chunk {
674 struct buffer_head *bh[CHUNK_SIZE];
675 int nr;
676};
677
678static void write_chunk(struct buffer_chunk *chunk)
679{
680 int i;
681 for (i = 0; i < chunk->nr; i++) {
682 submit_logged_buffer(chunk->bh[i]);
683 }
684 chunk->nr = 0;
685}
686
687static void write_ordered_chunk(struct buffer_chunk *chunk)
688{
689 int i;
690 for (i = 0; i < chunk->nr; i++) {
691 submit_ordered_buffer(chunk->bh[i]);
692 }
693 chunk->nr = 0;
694}
695
696static int add_to_chunk(struct buffer_chunk *chunk, struct buffer_head *bh,
697 spinlock_t * lock, void (fn) (struct buffer_chunk *))
698{
699 int ret = 0;
700 BUG_ON(chunk->nr >= CHUNK_SIZE);
701 chunk->bh[chunk->nr++] = bh;
702 if (chunk->nr >= CHUNK_SIZE) {
703 ret = 1;
704 if (lock)
705 spin_unlock(lock);
706 fn(chunk);
707 if (lock)
708 spin_lock(lock);
709 }
710 return ret;
711}
712
713static atomic_t nr_reiserfs_jh = ATOMIC_INIT(0);
714static struct reiserfs_jh *alloc_jh(void)
715{
716 struct reiserfs_jh *jh;
717 while (1) {
718 jh = kmalloc(sizeof(*jh), GFP_NOFS);
719 if (jh) {
720 atomic_inc(&nr_reiserfs_jh);
721 return jh;
722 }
723 yield();
724 }
725}
726
727/*
728 * we want to free the jh when the buffer has been written
729 * and waited on
730 */
731void reiserfs_free_jh(struct buffer_head *bh)
732{
733 struct reiserfs_jh *jh;
734
735 jh = bh->b_private;
736 if (jh) {
737 bh->b_private = NULL;
738 jh->bh = NULL;
739 list_del_init(&jh->list);
740 kfree(jh);
741 if (atomic_read(&nr_reiserfs_jh) <= 0)
742 BUG();
743 atomic_dec(&nr_reiserfs_jh);
744 put_bh(bh);
745 }
746}
747
748static inline int __add_jh(struct reiserfs_journal *j, struct buffer_head *bh,
749 int tail)
750{
751 struct reiserfs_jh *jh;
752
753 if (bh->b_private) {
754 spin_lock(&j->j_dirty_buffers_lock);
755 if (!bh->b_private) {
756 spin_unlock(&j->j_dirty_buffers_lock);
757 goto no_jh;
758 }
759 jh = bh->b_private;
760 list_del_init(&jh->list);
761 } else {
762 no_jh:
763 get_bh(bh);
764 jh = alloc_jh();
765 spin_lock(&j->j_dirty_buffers_lock);
766 /* 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
783int reiserfs_add_tail_list(struct inode *inode, struct buffer_head *bh)
784{
785 return __add_jh(SB_JOURNAL(inode->i_sb), bh, 1);
786}
787int 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)
793static 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 /* in theory, dirty non-uptodate buffers should never get here,
825 * but the upper layer io error paths still have a few quirks.
826 * Handle them here as gracefully as we can
827 */
828 if (!buffer_uptodate(bh) && buffer_dirty(bh)) {
829 clear_buffer_dirty(bh);
830 ret = -EIO;
831 }
832 if (buffer_dirty(bh)) {
833 list_move(&jh->list, &tmp);
834 add_to_chunk(&chunk, bh, lock, write_ordered_chunk);
835 } else {
836 reiserfs_free_jh(bh);
837 unlock_buffer(bh);
838 }
839 loop_next:
840 put_bh(bh);
841 cond_resched_lock(lock);
842 }
843 if (chunk.nr) {
844 spin_unlock(lock);
845 write_ordered_chunk(&chunk);
846 spin_lock(lock);
847 }
848 while (!list_empty(&tmp)) {
849 jh = JH_ENTRY(tmp.prev);
850 bh = jh->bh;
851 get_bh(bh);
852 reiserfs_free_jh(bh);
853
854 if (buffer_locked(bh)) {
855 spin_unlock(lock);
856 wait_on_buffer(bh);
857 spin_lock(lock);
858 }
859 if (!buffer_uptodate(bh)) {
860 ret = -EIO;
861 }
862 /* ugly interaction with invalidatepage here.
863 * reiserfs_invalidate_page will pin any buffer that has a valid
864 * journal head from an older transaction. If someone else sets
865 * our buffer dirty after we write it in the first loop, and
866 * then someone truncates the page away, nobody will ever write
867 * the buffer. We're safe if we write the page one last time
868 * after freeing the journal header.
869 */
870 if (buffer_dirty(bh) && unlikely(bh->b_page->mapping == NULL)) {
871 spin_unlock(lock);
872 ll_rw_block(WRITE, 1, &bh);
873 spin_lock(lock);
874 }
875 put_bh(bh);
876 cond_resched_lock(lock);
877 }
878 spin_unlock(lock);
879 return ret;
880}
881
882static int flush_older_commits(struct super_block *s,
883 struct reiserfs_journal_list *jl)
884{
885 struct reiserfs_journal *journal = SB_JOURNAL(s);
886 struct reiserfs_journal_list *other_jl;
887 struct reiserfs_journal_list *first_jl;
888 struct list_head *entry;
889 unsigned int trans_id = jl->j_trans_id;
890 unsigned int other_trans_id;
891 unsigned int first_trans_id;
892
893 find_first:
894 /*
895 * first we walk backwards to find the oldest uncommitted transation
896 */
897 first_jl = jl;
898 entry = jl->j_list.prev;
899 while (1) {
900 other_jl = JOURNAL_LIST_ENTRY(entry);
901 if (entry == &journal->j_journal_list ||
902 atomic_read(&other_jl->j_older_commits_done))
903 break;
904
905 first_jl = other_jl;
906 entry = other_jl->j_list.prev;
907 }
908
909 /* if we didn't find any older uncommitted transactions, return now */
910 if (first_jl == jl) {
911 return 0;
912 }
913
914 first_trans_id = first_jl->j_trans_id;
915
916 entry = &first_jl->j_list;
917 while (1) {
918 other_jl = JOURNAL_LIST_ENTRY(entry);
919 other_trans_id = other_jl->j_trans_id;
920
921 if (other_trans_id < trans_id) {
922 if (atomic_read(&other_jl->j_commit_left) != 0) {
923 flush_commit_list(s, other_jl, 0);
924
925 /* list we were called with is gone, return */
926 if (!journal_list_still_alive(s, trans_id))
927 return 1;
928
929 /* the one we just flushed is gone, this means all
930 * older lists are also gone, so first_jl is no longer
931 * valid either. Go back to the beginning.
932 */
933 if (!journal_list_still_alive
934 (s, other_trans_id)) {
935 goto find_first;
936 }
937 }
938 entry = entry->next;
939 if (entry == &journal->j_journal_list)
940 return 0;
941 } else {
942 return 0;
943 }
944 }
945 return 0;
946}
947
948static int reiserfs_async_progress_wait(struct super_block *s)
949{
950 struct reiserfs_journal *j = SB_JOURNAL(s);
951
952 if (atomic_read(&j->j_async_throttle)) {
953 reiserfs_write_unlock(s);
954 congestion_wait(BLK_RW_ASYNC, HZ / 10);
955 reiserfs_write_lock(s);
956 }
957
958 return 0;
959}
960
961/*
962** if this journal list still has commit blocks unflushed, send them to disk.
963**
964** log areas must be flushed in order (transaction 2 can't commit before transaction 1)
965** Before the commit block can by written, every other log block must be safely on disk
966**
967*/
968static int flush_commit_list(struct super_block *s,
969 struct reiserfs_journal_list *jl, int flushall)
970{
971 int i;
972 b_blocknr_t bn;
973 struct buffer_head *tbh = NULL;
974 unsigned int trans_id = jl->j_trans_id;
975 struct reiserfs_journal *journal = SB_JOURNAL(s);
976 int retval = 0;
977 int write_len;
978
979 reiserfs_check_lock_depth(s, "flush_commit_list");
980
981 if (atomic_read(&jl->j_older_commits_done)) {
982 return 0;
983 }
984
985 /* before we can put our commit blocks on disk, we have to make sure everyone older than
986 ** us is on disk too
987 */
988 BUG_ON(jl->j_len <= 0);
989 BUG_ON(trans_id == journal->j_trans_id);
990
991 get_journal_list(jl);
992 if (flushall) {
993 if (flush_older_commits(s, jl) == 1) {
994 /* list disappeared during flush_older_commits. return */
995 goto put_jl;
996 }
997 }
998
999 /* make sure nobody is trying to flush this one at the same time */
1000 reiserfs_mutex_lock_safe(&jl->j_commit_mutex, s);
1001
1002 if (!journal_list_still_alive(s, trans_id)) {
1003 mutex_unlock(&jl->j_commit_mutex);
1004 goto put_jl;
1005 }
1006 BUG_ON(jl->j_trans_id == 0);
1007
1008 /* this commit is done, exit */
1009 if (atomic_read(&(jl->j_commit_left)) <= 0) {
1010 if (flushall) {
1011 atomic_set(&(jl->j_older_commits_done), 1);
1012 }
1013 mutex_unlock(&jl->j_commit_mutex);
1014 goto put_jl;
1015 }
1016
1017 if (!list_empty(&jl->j_bh_list)) {
1018 int ret;
1019
1020 /*
1021 * We might sleep in numerous places inside
1022 * write_ordered_buffers. Relax the write lock.
1023 */
1024 reiserfs_write_unlock(s);
1025 ret = write_ordered_buffers(&journal->j_dirty_buffers_lock,
1026 journal, jl, &jl->j_bh_list);
1027 if (ret < 0 && retval == 0)
1028 retval = ret;
1029 reiserfs_write_lock(s);
1030 }
1031 BUG_ON(!list_empty(&jl->j_bh_list));
1032 /*
1033 * for the description block and all the log blocks, submit any buffers
1034 * that haven't already reached the disk. Try to write at least 256
1035 * log blocks. later on, we will only wait on blocks that correspond
1036 * to this transaction, but while we're unplugging we might as well
1037 * get a chunk of data on there.
1038 */
1039 atomic_inc(&journal->j_async_throttle);
1040 write_len = jl->j_len + 1;
1041 if (write_len < 256)
1042 write_len = 256;
1043 for (i = 0 ; i < write_len ; i++) {
1044 bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) + (jl->j_start + i) %
1045 SB_ONDISK_JOURNAL_SIZE(s);
1046 tbh = journal_find_get_block(s, bn);
1047 if (tbh) {
1048 if (buffer_dirty(tbh)) {
1049 reiserfs_write_unlock(s);
1050 ll_rw_block(WRITE, 1, &tbh);
1051 reiserfs_write_lock(s);
1052 }
1053 put_bh(tbh) ;
1054 }
1055 }
1056 atomic_dec(&journal->j_async_throttle);
1057
1058 for (i = 0; i < (jl->j_len + 1); i++) {
1059 bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) +
1060 (jl->j_start + i) % SB_ONDISK_JOURNAL_SIZE(s);
1061 tbh = journal_find_get_block(s, bn);
1062
1063 reiserfs_write_unlock(s);
1064 wait_on_buffer(tbh);
1065 reiserfs_write_lock(s);
1066 // since we're using ll_rw_blk above, it might have skipped over
1067 // a locked buffer. Double check here
1068 //
1069 /* redundant, sync_dirty_buffer() checks */
1070 if (buffer_dirty(tbh)) {
1071 reiserfs_write_unlock(s);
1072 sync_dirty_buffer(tbh);
1073 reiserfs_write_lock(s);
1074 }
1075 if (unlikely(!buffer_uptodate(tbh))) {
1076#ifdef CONFIG_REISERFS_CHECK
1077 reiserfs_warning(s, "journal-601",
1078 "buffer write failed");
1079#endif
1080 retval = -EIO;
1081 }
1082 put_bh(tbh); /* once for journal_find_get_block */
1083 put_bh(tbh); /* once due to original getblk in do_journal_end */
1084 atomic_dec(&(jl->j_commit_left));
1085 }
1086
1087 BUG_ON(atomic_read(&(jl->j_commit_left)) != 1);
1088
1089 /* If there was a write error in the journal - we can't commit
1090 * this transaction - it will be invalid and, if successful,
1091 * will just end up propagating the write error out to
1092 * the file system. */
1093 if (likely(!retval && !reiserfs_is_journal_aborted (journal))) {
1094 if (buffer_dirty(jl->j_commit_bh))
1095 BUG();
1096 mark_buffer_dirty(jl->j_commit_bh) ;
1097 reiserfs_write_unlock(s);
1098 if (reiserfs_barrier_flush(s))
1099 __sync_dirty_buffer(jl->j_commit_bh, WRITE_FLUSH_FUA);
1100 else
1101 sync_dirty_buffer(jl->j_commit_bh);
1102 reiserfs_write_lock(s);
1103 }
1104
1105 /* If there was a write error in the journal - we can't commit this
1106 * transaction - it will be invalid and, if successful, will just end
1107 * up propagating the write error out to the filesystem. */
1108 if (unlikely(!buffer_uptodate(jl->j_commit_bh))) {
1109#ifdef CONFIG_REISERFS_CHECK
1110 reiserfs_warning(s, "journal-615", "buffer write failed");
1111#endif
1112 retval = -EIO;
1113 }
1114 bforget(jl->j_commit_bh);
1115 if (journal->j_last_commit_id != 0 &&
1116 (jl->j_trans_id - journal->j_last_commit_id) != 1) {
1117 reiserfs_warning(s, "clm-2200", "last commit %lu, current %lu",
1118 journal->j_last_commit_id, jl->j_trans_id);
1119 }
1120 journal->j_last_commit_id = jl->j_trans_id;
1121
1122 /* now, every commit block is on the disk. It is safe to allow blocks freed during this transaction to be reallocated */
1123 cleanup_freed_for_journal_list(s, jl);
1124
1125 retval = retval ? retval : journal->j_errno;
1126
1127 /* mark the metadata dirty */
1128 if (!retval)
1129 dirty_one_transaction(s, jl);
1130 atomic_dec(&(jl->j_commit_left));
1131
1132 if (flushall) {
1133 atomic_set(&(jl->j_older_commits_done), 1);
1134 }
1135 mutex_unlock(&jl->j_commit_mutex);
1136 put_jl:
1137 put_journal_list(s, jl);
1138
1139 if (retval)
1140 reiserfs_abort(s, retval, "Journal write error in %s",
1141 __func__);
1142 return retval;
1143}
1144
1145/*
1146** flush_journal_list frequently needs to find a newer transaction for a given block. This does that, or
1147** returns NULL if it can't find anything
1148*/
1149static struct reiserfs_journal_list *find_newer_jl_for_cn(struct
1150 reiserfs_journal_cnode
1151 *cn)
1152{
1153 struct super_block *sb = cn->sb;
1154 b_blocknr_t blocknr = cn->blocknr;
1155
1156 cn = cn->hprev;
1157 while (cn) {
1158 if (cn->sb == sb && cn->blocknr == blocknr && cn->jlist) {
1159 return cn->jlist;
1160 }
1161 cn = cn->hprev;
1162 }
1163 return NULL;
1164}
1165
1166static int newer_jl_done(struct reiserfs_journal_cnode *cn)
1167{
1168 struct super_block *sb = cn->sb;
1169 b_blocknr_t blocknr = cn->blocknr;
1170
1171 cn = cn->hprev;
1172 while (cn) {
1173 if (cn->sb == sb && cn->blocknr == blocknr && cn->jlist &&
1174 atomic_read(&cn->jlist->j_commit_left) != 0)
1175 return 0;
1176 cn = cn->hprev;
1177 }
1178 return 1;
1179}
1180
1181static void remove_journal_hash(struct super_block *,
1182 struct reiserfs_journal_cnode **,
1183 struct reiserfs_journal_list *, unsigned long,
1184 int);
1185
1186/*
1187** once all the real blocks have been flushed, it is safe to remove them from the
1188** journal list for this transaction. Aside from freeing the cnode, this also allows the
1189** block to be reallocated for data blocks if it had been deleted.
1190*/
1191static void remove_all_from_journal_list(struct super_block *sb,
1192 struct reiserfs_journal_list *jl,
1193 int debug)
1194{
1195 struct reiserfs_journal *journal = SB_JOURNAL(sb);
1196 struct reiserfs_journal_cnode *cn, *last;
1197 cn = jl->j_realblock;
1198
1199 /* which is better, to lock once around the whole loop, or
1200 ** to lock for each call to remove_journal_hash?
1201 */
1202 while (cn) {
1203 if (cn->blocknr != 0) {
1204 if (debug) {
1205 reiserfs_warning(sb, "reiserfs-2201",
1206 "block %u, bh is %d, state %ld",
1207 cn->blocknr, cn->bh ? 1 : 0,
1208 cn->state);
1209 }
1210 cn->state = 0;
1211 remove_journal_hash(sb, journal->j_list_hash_table,
1212 jl, cn->blocknr, 1);
1213 }
1214 last = cn;
1215 cn = cn->next;
1216 free_cnode(sb, last);
1217 }
1218 jl->j_realblock = NULL;
1219}
1220
1221/*
1222** if this timestamp is greater than the timestamp we wrote last to the header block, write it to the header block.
1223** once this is done, I can safely say the log area for this transaction won't ever be replayed, and I can start
1224** releasing blocks in this transaction for reuse as data blocks.
1225** called by flush_journal_list, before it calls remove_all_from_journal_list
1226**
1227*/
1228static int _update_journal_header_block(struct super_block *sb,
1229 unsigned long offset,
1230 unsigned int trans_id)
1231{
1232 struct reiserfs_journal_header *jh;
1233 struct reiserfs_journal *journal = SB_JOURNAL(sb);
1234
1235 if (reiserfs_is_journal_aborted(journal))
1236 return -EIO;
1237
1238 if (trans_id >= journal->j_last_flush_trans_id) {
1239 if (buffer_locked((journal->j_header_bh))) {
1240 reiserfs_write_unlock(sb);
1241 wait_on_buffer((journal->j_header_bh));
1242 reiserfs_write_lock(sb);
1243 if (unlikely(!buffer_uptodate(journal->j_header_bh))) {
1244#ifdef CONFIG_REISERFS_CHECK
1245 reiserfs_warning(sb, "journal-699",
1246 "buffer write failed");
1247#endif
1248 return -EIO;
1249 }
1250 }
1251 journal->j_last_flush_trans_id = trans_id;
1252 journal->j_first_unflushed_offset = offset;
1253 jh = (struct reiserfs_journal_header *)(journal->j_header_bh->
1254 b_data);
1255 jh->j_last_flush_trans_id = cpu_to_le32(trans_id);
1256 jh->j_first_unflushed_offset = cpu_to_le32(offset);
1257 jh->j_mount_id = cpu_to_le32(journal->j_mount_id);
1258
1259 set_buffer_dirty(journal->j_header_bh);
1260 reiserfs_write_unlock(sb);
1261
1262 if (reiserfs_barrier_flush(sb))
1263 __sync_dirty_buffer(journal->j_header_bh, WRITE_FLUSH_FUA);
1264 else
1265 sync_dirty_buffer(journal->j_header_bh);
1266
1267 reiserfs_write_lock(sb);
1268 if (!buffer_uptodate(journal->j_header_bh)) {
1269 reiserfs_warning(sb, "journal-837",
1270 "IO error during journal replay");
1271 return -EIO;
1272 }
1273 }
1274 return 0;
1275}
1276
1277static int update_journal_header_block(struct super_block *sb,
1278 unsigned long offset,
1279 unsigned int trans_id)
1280{
1281 return _update_journal_header_block(sb, offset, trans_id);
1282}
1283
1284/*
1285** flush any and all journal lists older than you are
1286** can only be called from flush_journal_list
1287*/
1288static int flush_older_journal_lists(struct super_block *sb,
1289 struct reiserfs_journal_list *jl)
1290{
1291 struct list_head *entry;
1292 struct reiserfs_journal_list *other_jl;
1293 struct reiserfs_journal *journal = SB_JOURNAL(sb);
1294 unsigned int trans_id = jl->j_trans_id;
1295
1296 /* we know we are the only ones flushing things, no extra race
1297 * protection is required.
1298 */
1299 restart:
1300 entry = journal->j_journal_list.next;
1301 /* Did we wrap? */
1302 if (entry == &journal->j_journal_list)
1303 return 0;
1304 other_jl = JOURNAL_LIST_ENTRY(entry);
1305 if (other_jl->j_trans_id < trans_id) {
1306 BUG_ON(other_jl->j_refcount <= 0);
1307 /* do not flush all */
1308 flush_journal_list(sb, other_jl, 0);
1309
1310 /* other_jl is now deleted from the list */
1311 goto restart;
1312 }
1313 return 0;
1314}
1315
1316static void del_from_work_list(struct super_block *s,
1317 struct reiserfs_journal_list *jl)
1318{
1319 struct reiserfs_journal *journal = SB_JOURNAL(s);
1320 if (!list_empty(&jl->j_working_list)) {
1321 list_del_init(&jl->j_working_list);
1322 journal->j_num_work_lists--;
1323 }
1324}
1325
1326/* flush a journal list, both commit and real blocks
1327**
1328** always set flushall to 1, unless you are calling from inside
1329** flush_journal_list
1330**
1331** IMPORTANT. This can only be called while there are no journal writers,
1332** and the journal is locked. That means it can only be called from
1333** do_journal_end, or by journal_release
1334*/
1335static int flush_journal_list(struct super_block *s,
1336 struct reiserfs_journal_list *jl, int flushall)
1337{
1338 struct reiserfs_journal_list *pjl;
1339 struct reiserfs_journal_cnode *cn, *last;
1340 int count;
1341 int was_jwait = 0;
1342 int was_dirty = 0;
1343 struct buffer_head *saved_bh;
1344 unsigned long j_len_saved = jl->j_len;
1345 struct reiserfs_journal *journal = SB_JOURNAL(s);
1346 int err = 0;
1347
1348 BUG_ON(j_len_saved <= 0);
1349
1350 if (atomic_read(&journal->j_wcount) != 0) {
1351 reiserfs_warning(s, "clm-2048", "called with wcount %d",
1352 atomic_read(&journal->j_wcount));
1353 }
1354 BUG_ON(jl->j_trans_id == 0);
1355
1356 /* if flushall == 0, the lock is already held */
1357 if (flushall) {
1358 reiserfs_mutex_lock_safe(&journal->j_flush_mutex, s);
1359 } else if (mutex_trylock(&journal->j_flush_mutex)) {
1360 BUG();
1361 }
1362
1363 count = 0;
1364 if (j_len_saved > journal->j_trans_max) {
1365 reiserfs_panic(s, "journal-715", "length is %lu, trans id %lu",
1366 j_len_saved, jl->j_trans_id);
1367 return 0;
1368 }
1369
1370 /* if all the work is already done, get out of here */
1371 if (atomic_read(&(jl->j_nonzerolen)) <= 0 &&
1372 atomic_read(&(jl->j_commit_left)) <= 0) {
1373 goto flush_older_and_return;
1374 }
1375
1376 /* start by putting the commit list on disk. This will also flush
1377 ** the commit lists of any olders transactions
1378 */
1379 flush_commit_list(s, jl, 1);
1380
1381 if (!(jl->j_state & LIST_DIRTY)
1382 && !reiserfs_is_journal_aborted(journal))
1383 BUG();
1384
1385 /* are we done now? */
1386 if (atomic_read(&(jl->j_nonzerolen)) <= 0 &&
1387 atomic_read(&(jl->j_commit_left)) <= 0) {
1388 goto flush_older_and_return;
1389 }
1390
1391 /* loop through each cnode, see if we need to write it,
1392 ** or wait on a more recent transaction, or just ignore it
1393 */
1394 if (atomic_read(&(journal->j_wcount)) != 0) {
1395 reiserfs_panic(s, "journal-844", "journal list is flushing, "
1396 "wcount is not 0");
1397 }
1398 cn = jl->j_realblock;
1399 while (cn) {
1400 was_jwait = 0;
1401 was_dirty = 0;
1402 saved_bh = NULL;
1403 /* blocknr of 0 is no longer in the hash, ignore it */
1404 if (cn->blocknr == 0) {
1405 goto free_cnode;
1406 }
1407
1408 /* This transaction failed commit. Don't write out to the disk */
1409 if (!(jl->j_state & LIST_DIRTY))
1410 goto free_cnode;
1411
1412 pjl = find_newer_jl_for_cn(cn);
1413 /* the order is important here. We check pjl to make sure we
1414 ** don't clear BH_JDirty_wait if we aren't the one writing this
1415 ** block to disk
1416 */
1417 if (!pjl && cn->bh) {
1418 saved_bh = cn->bh;
1419
1420 /* we do this to make sure nobody releases the buffer while
1421 ** we are working with it
1422 */
1423 get_bh(saved_bh);
1424
1425 if (buffer_journal_dirty(saved_bh)) {
1426 BUG_ON(!can_dirty(cn));
1427 was_jwait = 1;
1428 was_dirty = 1;
1429 } else if (can_dirty(cn)) {
1430 /* everything with !pjl && jwait should be writable */
1431 BUG();
1432 }
1433 }
1434
1435 /* if someone has this block in a newer transaction, just make
1436 ** sure they are committed, and don't try writing it to disk
1437 */
1438 if (pjl) {
1439 if (atomic_read(&pjl->j_commit_left))
1440 flush_commit_list(s, pjl, 1);
1441 goto free_cnode;
1442 }
1443
1444 /* bh == NULL when the block got to disk on its own, OR,
1445 ** the block got freed in a future transaction
1446 */
1447 if (saved_bh == NULL) {
1448 goto free_cnode;
1449 }
1450
1451 /* this should never happen. kupdate_one_transaction has this list
1452 ** locked while it works, so we should never see a buffer here that
1453 ** is not marked JDirty_wait
1454 */
1455 if ((!was_jwait) && !buffer_locked(saved_bh)) {
1456 reiserfs_warning(s, "journal-813",
1457 "BAD! buffer %llu %cdirty %cjwait, "
1458 "not in a newer tranasction",
1459 (unsigned long long)saved_bh->
1460 b_blocknr, was_dirty ? ' ' : '!',
1461 was_jwait ? ' ' : '!');
1462 }
1463 if (was_dirty) {
1464 /* we inc again because saved_bh gets decremented at free_cnode */
1465 get_bh(saved_bh);
1466 set_bit(BLOCK_NEEDS_FLUSH, &cn->state);
1467 lock_buffer(saved_bh);
1468 BUG_ON(cn->blocknr != saved_bh->b_blocknr);
1469 if (buffer_dirty(saved_bh))
1470 submit_logged_buffer(saved_bh);
1471 else
1472 unlock_buffer(saved_bh);
1473 count++;
1474 } else {
1475 reiserfs_warning(s, "clm-2082",
1476 "Unable to flush buffer %llu in %s",
1477 (unsigned long long)saved_bh->
1478 b_blocknr, __func__);
1479 }
1480 free_cnode:
1481 last = cn;
1482 cn = cn->next;
1483 if (saved_bh) {
1484 /* we incremented this to keep others from taking the buffer head away */
1485 put_bh(saved_bh);
1486 if (atomic_read(&(saved_bh->b_count)) < 0) {
1487 reiserfs_warning(s, "journal-945",
1488 "saved_bh->b_count < 0");
1489 }
1490 }
1491 }
1492 if (count > 0) {
1493 cn = jl->j_realblock;
1494 while (cn) {
1495 if (test_bit(BLOCK_NEEDS_FLUSH, &cn->state)) {
1496 if (!cn->bh) {
1497 reiserfs_panic(s, "journal-1011",
1498 "cn->bh is NULL");
1499 }
1500
1501 reiserfs_write_unlock(s);
1502 wait_on_buffer(cn->bh);
1503 reiserfs_write_lock(s);
1504
1505 if (!cn->bh) {
1506 reiserfs_panic(s, "journal-1012",
1507 "cn->bh is NULL");
1508 }
1509 if (unlikely(!buffer_uptodate(cn->bh))) {
1510#ifdef CONFIG_REISERFS_CHECK
1511 reiserfs_warning(s, "journal-949",
1512 "buffer write failed");
1513#endif
1514 err = -EIO;
1515 }
1516 /* note, we must clear the JDirty_wait bit after the up to date
1517 ** check, otherwise we race against our flushpage routine
1518 */
1519 BUG_ON(!test_clear_buffer_journal_dirty
1520 (cn->bh));
1521
1522 /* drop one ref for us */
1523 put_bh(cn->bh);
1524 /* drop one ref for journal_mark_dirty */
1525 release_buffer_page(cn->bh);
1526 }
1527 cn = cn->next;
1528 }
1529 }
1530
1531 if (err)
1532 reiserfs_abort(s, -EIO,
1533 "Write error while pushing transaction to disk in %s",
1534 __func__);
1535 flush_older_and_return:
1536
1537 /* before we can update the journal header block, we _must_ flush all
1538 ** real blocks from all older transactions to disk. This is because
1539 ** once the header block is updated, this transaction will not be
1540 ** replayed after a crash
1541 */
1542 if (flushall) {
1543 flush_older_journal_lists(s, jl);
1544 }
1545
1546 err = journal->j_errno;
1547 /* before we can remove everything from the hash tables for this
1548 ** transaction, we must make sure it can never be replayed
1549 **
1550 ** since we are only called from do_journal_end, we know for sure there
1551 ** are no allocations going on while we are flushing journal lists. So,
1552 ** we only need to update the journal header block for the last list
1553 ** being flushed
1554 */
1555 if (!err && flushall) {
1556 err =
1557 update_journal_header_block(s,
1558 (jl->j_start + jl->j_len +
1559 2) % SB_ONDISK_JOURNAL_SIZE(s),
1560 jl->j_trans_id);
1561 if (err)
1562 reiserfs_abort(s, -EIO,
1563 "Write error while updating journal header in %s",
1564 __func__);
1565 }
1566 remove_all_from_journal_list(s, jl, 0);
1567 list_del_init(&jl->j_list);
1568 journal->j_num_lists--;
1569 del_from_work_list(s, jl);
1570
1571 if (journal->j_last_flush_id != 0 &&
1572 (jl->j_trans_id - journal->j_last_flush_id) != 1) {
1573 reiserfs_warning(s, "clm-2201", "last flush %lu, current %lu",
1574 journal->j_last_flush_id, jl->j_trans_id);
1575 }
1576 journal->j_last_flush_id = jl->j_trans_id;
1577
1578 /* not strictly required since we are freeing the list, but it should
1579 * help find code using dead lists later on
1580 */
1581 jl->j_len = 0;
1582 atomic_set(&(jl->j_nonzerolen), 0);
1583 jl->j_start = 0;
1584 jl->j_realblock = NULL;
1585 jl->j_commit_bh = NULL;
1586 jl->j_trans_id = 0;
1587 jl->j_state = 0;
1588 put_journal_list(s, jl);
1589 if (flushall)
1590 mutex_unlock(&journal->j_flush_mutex);
1591 return err;
1592}
1593
1594static int test_transaction(struct super_block *s,
1595 struct reiserfs_journal_list *jl)
1596{
1597 struct reiserfs_journal_cnode *cn;
1598
1599 if (jl->j_len == 0 || atomic_read(&jl->j_nonzerolen) == 0)
1600 return 1;
1601
1602 cn = jl->j_realblock;
1603 while (cn) {
1604 /* if the blocknr == 0, this has been cleared from the hash,
1605 ** skip it
1606 */
1607 if (cn->blocknr == 0) {
1608 goto next;
1609 }
1610 if (cn->bh && !newer_jl_done(cn))
1611 return 0;
1612 next:
1613 cn = cn->next;
1614 cond_resched();
1615 }
1616 return 0;
1617}
1618
1619static int write_one_transaction(struct super_block *s,
1620 struct reiserfs_journal_list *jl,
1621 struct buffer_chunk *chunk)
1622{
1623 struct reiserfs_journal_cnode *cn;
1624 int ret = 0;
1625
1626 jl->j_state |= LIST_TOUCHED;
1627 del_from_work_list(s, jl);
1628 if (jl->j_len == 0 || atomic_read(&jl->j_nonzerolen) == 0) {
1629 return 0;
1630 }
1631
1632 cn = jl->j_realblock;
1633 while (cn) {
1634 /* if the blocknr == 0, this has been cleared from the hash,
1635 ** skip it
1636 */
1637 if (cn->blocknr == 0) {
1638 goto next;
1639 }
1640 if (cn->bh && can_dirty(cn) && buffer_dirty(cn->bh)) {
1641 struct buffer_head *tmp_bh;
1642 /* we can race against journal_mark_freed when we try
1643 * to lock_buffer(cn->bh), so we have to inc the buffer
1644 * count, and recheck things after locking
1645 */
1646 tmp_bh = cn->bh;
1647 get_bh(tmp_bh);
1648 lock_buffer(tmp_bh);
1649 if (cn->bh && can_dirty(cn) && buffer_dirty(tmp_bh)) {
1650 if (!buffer_journal_dirty(tmp_bh) ||
1651 buffer_journal_prepared(tmp_bh))
1652 BUG();
1653 add_to_chunk(chunk, tmp_bh, NULL, write_chunk);
1654 ret++;
1655 } else {
1656 /* note, cn->bh might be null now */
1657 unlock_buffer(tmp_bh);
1658 }
1659 put_bh(tmp_bh);
1660 }
1661 next:
1662 cn = cn->next;
1663 cond_resched();
1664 }
1665 return ret;
1666}
1667
1668/* used by flush_commit_list */
1669static int dirty_one_transaction(struct super_block *s,
1670 struct reiserfs_journal_list *jl)
1671{
1672 struct reiserfs_journal_cnode *cn;
1673 struct reiserfs_journal_list *pjl;
1674 int ret = 0;
1675
1676 jl->j_state |= LIST_DIRTY;
1677 cn = jl->j_realblock;
1678 while (cn) {
1679 /* look for a more recent transaction that logged this
1680 ** buffer. Only the most recent transaction with a buffer in
1681 ** it is allowed to send that buffer to disk
1682 */
1683 pjl = find_newer_jl_for_cn(cn);
1684 if (!pjl && cn->blocknr && cn->bh
1685 && buffer_journal_dirty(cn->bh)) {
1686 BUG_ON(!can_dirty(cn));
1687 /* if the buffer is prepared, it will either be logged
1688 * or restored. If restored, we need to make sure
1689 * it actually gets marked dirty
1690 */
1691 clear_buffer_journal_new(cn->bh);
1692 if (buffer_journal_prepared(cn->bh)) {
1693 set_buffer_journal_restore_dirty(cn->bh);
1694 } else {
1695 set_buffer_journal_test(cn->bh);
1696 mark_buffer_dirty(cn->bh);
1697 }
1698 }
1699 cn = cn->next;
1700 }
1701 return ret;
1702}
1703
1704static int kupdate_transactions(struct super_block *s,
1705 struct reiserfs_journal_list *jl,
1706 struct reiserfs_journal_list **next_jl,
1707 unsigned int *next_trans_id,
1708 int num_blocks, int num_trans)
1709{
1710 int ret = 0;
1711 int written = 0;
1712 int transactions_flushed = 0;
1713 unsigned int orig_trans_id = jl->j_trans_id;
1714 struct buffer_chunk chunk;
1715 struct list_head *entry;
1716 struct reiserfs_journal *journal = SB_JOURNAL(s);
1717 chunk.nr = 0;
1718
1719 reiserfs_mutex_lock_safe(&journal->j_flush_mutex, s);
1720 if (!journal_list_still_alive(s, orig_trans_id)) {
1721 goto done;
1722 }
1723
1724 /* we've got j_flush_mutex held, nobody is going to delete any
1725 * of these lists out from underneath us
1726 */
1727 while ((num_trans && transactions_flushed < num_trans) ||
1728 (!num_trans && written < num_blocks)) {
1729
1730 if (jl->j_len == 0 || (jl->j_state & LIST_TOUCHED) ||
1731 atomic_read(&jl->j_commit_left)
1732 || !(jl->j_state & LIST_DIRTY)) {
1733 del_from_work_list(s, jl);
1734 break;
1735 }
1736 ret = write_one_transaction(s, jl, &chunk);
1737
1738 if (ret < 0)
1739 goto done;
1740 transactions_flushed++;
1741 written += ret;
1742 entry = jl->j_list.next;
1743
1744 /* did we wrap? */
1745 if (entry == &journal->j_journal_list) {
1746 break;
1747 }
1748 jl = JOURNAL_LIST_ENTRY(entry);
1749
1750 /* don't bother with older transactions */
1751 if (jl->j_trans_id <= orig_trans_id)
1752 break;
1753 }
1754 if (chunk.nr) {
1755 write_chunk(&chunk);
1756 }
1757
1758 done:
1759 mutex_unlock(&journal->j_flush_mutex);
1760 return ret;
1761}
1762
1763/* for o_sync and fsync heavy applications, they tend to use
1764** all the journa list slots with tiny transactions. These
1765** trigger lots and lots of calls to update the header block, which
1766** adds seeks and slows things down.
1767**
1768** This function tries to clear out a large chunk of the journal lists
1769** at once, which makes everything faster since only the newest journal
1770** list updates the header block
1771*/
1772static int flush_used_journal_lists(struct super_block *s,
1773 struct reiserfs_journal_list *jl)
1774{
1775 unsigned long len = 0;
1776 unsigned long cur_len;
1777 int ret;
1778 int i;
1779 int limit = 256;
1780 struct reiserfs_journal_list *tjl;
1781 struct reiserfs_journal_list *flush_jl;
1782 unsigned int trans_id;
1783 struct reiserfs_journal *journal = SB_JOURNAL(s);
1784
1785 flush_jl = tjl = jl;
1786
1787 /* in data logging mode, try harder to flush a lot of blocks */
1788 if (reiserfs_data_log(s))
1789 limit = 1024;
1790 /* flush for 256 transactions or limit blocks, whichever comes first */
1791 for (i = 0; i < 256 && len < limit; i++) {
1792 if (atomic_read(&tjl->j_commit_left) ||
1793 tjl->j_trans_id < jl->j_trans_id) {
1794 break;
1795 }
1796 cur_len = atomic_read(&tjl->j_nonzerolen);
1797 if (cur_len > 0) {
1798 tjl->j_state &= ~LIST_TOUCHED;
1799 }
1800 len += cur_len;
1801 flush_jl = tjl;
1802 if (tjl->j_list.next == &journal->j_journal_list)
1803 break;
1804 tjl = JOURNAL_LIST_ENTRY(tjl->j_list.next);
1805 }
1806 /* try to find a group of blocks we can flush across all the
1807 ** transactions, but only bother if we've actually spanned
1808 ** across multiple lists
1809 */
1810 if (flush_jl != jl) {
1811 ret = kupdate_transactions(s, jl, &tjl, &trans_id, len, i);
1812 }
1813 flush_journal_list(s, flush_jl, 1);
1814 return 0;
1815}
1816
1817/*
1818** removes any nodes in table with name block and dev as bh.
1819** only touchs the hnext and hprev pointers.
1820*/
1821void remove_journal_hash(struct super_block *sb,
1822 struct reiserfs_journal_cnode **table,
1823 struct reiserfs_journal_list *jl,
1824 unsigned long block, int remove_freed)
1825{
1826 struct reiserfs_journal_cnode *cur;
1827 struct reiserfs_journal_cnode **head;
1828
1829 head = &(journal_hash(table, sb, block));
1830 if (!head) {
1831 return;
1832 }
1833 cur = *head;
1834 while (cur) {
1835 if (cur->blocknr == block && cur->sb == sb
1836 && (jl == NULL || jl == cur->jlist)
1837 && (!test_bit(BLOCK_FREED, &cur->state) || remove_freed)) {
1838 if (cur->hnext) {
1839 cur->hnext->hprev = cur->hprev;
1840 }
1841 if (cur->hprev) {
1842 cur->hprev->hnext = cur->hnext;
1843 } else {
1844 *head = cur->hnext;
1845 }
1846 cur->blocknr = 0;
1847 cur->sb = NULL;
1848 cur->state = 0;
1849 if (cur->bh && cur->jlist) /* anybody who clears the cur->bh will also dec the nonzerolen */
1850 atomic_dec(&(cur->jlist->j_nonzerolen));
1851 cur->bh = NULL;
1852 cur->jlist = NULL;
1853 }
1854 cur = cur->hnext;
1855 }
1856}
1857
1858static void free_journal_ram(struct super_block *sb)
1859{
1860 struct reiserfs_journal *journal = SB_JOURNAL(sb);
1861 kfree(journal->j_current_jl);
1862 journal->j_num_lists--;
1863
1864 vfree(journal->j_cnode_free_orig);
1865 free_list_bitmaps(sb, journal->j_list_bitmap);
1866 free_bitmap_nodes(sb); /* must be after free_list_bitmaps */
1867 if (journal->j_header_bh) {
1868 brelse(journal->j_header_bh);
1869 }
1870 /* j_header_bh is on the journal dev, make sure not to release the journal
1871 * dev until we brelse j_header_bh
1872 */
1873 release_journal_dev(sb, journal);
1874 vfree(journal);
1875}
1876
1877/*
1878** call on unmount. Only set error to 1 if you haven't made your way out
1879** of read_super() yet. Any other caller must keep error at 0.
1880*/
1881static int do_journal_release(struct reiserfs_transaction_handle *th,
1882 struct super_block *sb, int error)
1883{
1884 struct reiserfs_transaction_handle myth;
1885 int flushed = 0;
1886 struct reiserfs_journal *journal = SB_JOURNAL(sb);
1887
1888 /* we only want to flush out transactions if we were called with error == 0
1889 */
1890 if (!error && !(sb->s_flags & MS_RDONLY)) {
1891 /* end the current trans */
1892 BUG_ON(!th->t_trans_id);
1893 do_journal_end(th, sb, 10, FLUSH_ALL);
1894
1895 /* make sure something gets logged to force our way into the flush code */
1896 if (!journal_join(&myth, sb, 1)) {
1897 reiserfs_prepare_for_journal(sb,
1898 SB_BUFFER_WITH_SB(sb),
1899 1);
1900 journal_mark_dirty(&myth, sb,
1901 SB_BUFFER_WITH_SB(sb));
1902 do_journal_end(&myth, sb, 1, FLUSH_ALL);
1903 flushed = 1;
1904 }
1905 }
1906
1907 /* this also catches errors during the do_journal_end above */
1908 if (!error && reiserfs_is_journal_aborted(journal)) {
1909 memset(&myth, 0, sizeof(myth));
1910 if (!journal_join_abort(&myth, sb, 1)) {
1911 reiserfs_prepare_for_journal(sb,
1912 SB_BUFFER_WITH_SB(sb),
1913 1);
1914 journal_mark_dirty(&myth, sb,
1915 SB_BUFFER_WITH_SB(sb));
1916 do_journal_end(&myth, sb, 1, FLUSH_ALL);
1917 }
1918 }
1919
1920 reiserfs_mounted_fs_count--;
1921 /* wait for all commits to finish */
1922 cancel_delayed_work(&SB_JOURNAL(sb)->j_work);
1923
1924 /*
1925 * We must release the write lock here because
1926 * the workqueue job (flush_async_commit) needs this lock
1927 */
1928 reiserfs_write_unlock(sb);
1929 flush_workqueue(commit_wq);
1930
1931 if (!reiserfs_mounted_fs_count) {
1932 destroy_workqueue(commit_wq);
1933 commit_wq = NULL;
1934 }
1935
1936 free_journal_ram(sb);
1937
1938 reiserfs_write_lock(sb);
1939
1940 return 0;
1941}
1942
1943/*
1944** call on unmount. flush all journal trans, release all alloc'd ram
1945*/
1946int journal_release(struct reiserfs_transaction_handle *th,
1947 struct super_block *sb)
1948{
1949 return do_journal_release(th, sb, 0);
1950}
1951
1952/*
1953** only call from an error condition inside reiserfs_read_super!
1954*/
1955int journal_release_error(struct reiserfs_transaction_handle *th,
1956 struct super_block *sb)
1957{
1958 return do_journal_release(th, sb, 1);
1959}
1960
1961/* compares description block with commit block. returns 1 if they differ, 0 if they are the same */
1962static int journal_compare_desc_commit(struct super_block *sb,
1963 struct reiserfs_journal_desc *desc,
1964 struct reiserfs_journal_commit *commit)
1965{
1966 if (get_commit_trans_id(commit) != get_desc_trans_id(desc) ||
1967 get_commit_trans_len(commit) != get_desc_trans_len(desc) ||
1968 get_commit_trans_len(commit) > SB_JOURNAL(sb)->j_trans_max ||
1969 get_commit_trans_len(commit) <= 0) {
1970 return 1;
1971 }
1972 return 0;
1973}
1974
1975/* returns 0 if it did not find a description block
1976** returns -1 if it found a corrupt commit block
1977** returns 1 if both desc and commit were valid
1978*/
1979static int journal_transaction_is_valid(struct super_block *sb,
1980 struct buffer_head *d_bh,
1981 unsigned int *oldest_invalid_trans_id,
1982 unsigned long *newest_mount_id)
1983{
1984 struct reiserfs_journal_desc *desc;
1985 struct reiserfs_journal_commit *commit;
1986 struct buffer_head *c_bh;
1987 unsigned long offset;
1988
1989 if (!d_bh)
1990 return 0;
1991
1992 desc = (struct reiserfs_journal_desc *)d_bh->b_data;
1993 if (get_desc_trans_len(desc) > 0
1994 && !memcmp(get_journal_desc_magic(d_bh), JOURNAL_DESC_MAGIC, 8)) {
1995 if (oldest_invalid_trans_id && *oldest_invalid_trans_id
1996 && get_desc_trans_id(desc) > *oldest_invalid_trans_id) {
1997 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
1998 "journal-986: transaction "
1999 "is valid returning because trans_id %d is greater than "
2000 "oldest_invalid %lu",
2001 get_desc_trans_id(desc),
2002 *oldest_invalid_trans_id);
2003 return 0;
2004 }
2005 if (newest_mount_id
2006 && *newest_mount_id > get_desc_mount_id(desc)) {
2007 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2008 "journal-1087: transaction "
2009 "is valid returning because mount_id %d is less than "
2010 "newest_mount_id %lu",
2011 get_desc_mount_id(desc),
2012 *newest_mount_id);
2013 return -1;
2014 }
2015 if (get_desc_trans_len(desc) > SB_JOURNAL(sb)->j_trans_max) {
2016 reiserfs_warning(sb, "journal-2018",
2017 "Bad transaction length %d "
2018 "encountered, ignoring transaction",
2019 get_desc_trans_len(desc));
2020 return -1;
2021 }
2022 offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2023
2024 /* ok, we have a journal description block, lets see if the transaction was valid */
2025 c_bh =
2026 journal_bread(sb,
2027 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2028 ((offset + get_desc_trans_len(desc) +
2029 1) % SB_ONDISK_JOURNAL_SIZE(sb)));
2030 if (!c_bh)
2031 return 0;
2032 commit = (struct reiserfs_journal_commit *)c_bh->b_data;
2033 if (journal_compare_desc_commit(sb, desc, commit)) {
2034 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2035 "journal_transaction_is_valid, commit offset %ld had bad "
2036 "time %d or length %d",
2037 c_bh->b_blocknr -
2038 SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2039 get_commit_trans_id(commit),
2040 get_commit_trans_len(commit));
2041 brelse(c_bh);
2042 if (oldest_invalid_trans_id) {
2043 *oldest_invalid_trans_id =
2044 get_desc_trans_id(desc);
2045 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2046 "journal-1004: "
2047 "transaction_is_valid setting oldest invalid trans_id "
2048 "to %d",
2049 get_desc_trans_id(desc));
2050 }
2051 return -1;
2052 }
2053 brelse(c_bh);
2054 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2055 "journal-1006: found valid "
2056 "transaction start offset %llu, len %d id %d",
2057 d_bh->b_blocknr -
2058 SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2059 get_desc_trans_len(desc),
2060 get_desc_trans_id(desc));
2061 return 1;
2062 } else {
2063 return 0;
2064 }
2065}
2066
2067static void brelse_array(struct buffer_head **heads, int num)
2068{
2069 int i;
2070 for (i = 0; i < num; i++) {
2071 brelse(heads[i]);
2072 }
2073}
2074
2075/*
2076** given the start, and values for the oldest acceptable transactions,
2077** this either reads in a replays a transaction, or returns because the transaction
2078** is invalid, or too old.
2079*/
2080static int journal_read_transaction(struct super_block *sb,
2081 unsigned long cur_dblock,
2082 unsigned long oldest_start,
2083 unsigned int oldest_trans_id,
2084 unsigned long newest_mount_id)
2085{
2086 struct reiserfs_journal *journal = SB_JOURNAL(sb);
2087 struct reiserfs_journal_desc *desc;
2088 struct reiserfs_journal_commit *commit;
2089 unsigned int trans_id = 0;
2090 struct buffer_head *c_bh;
2091 struct buffer_head *d_bh;
2092 struct buffer_head **log_blocks = NULL;
2093 struct buffer_head **real_blocks = NULL;
2094 unsigned int trans_offset;
2095 int i;
2096 int trans_half;
2097
2098 d_bh = journal_bread(sb, cur_dblock);
2099 if (!d_bh)
2100 return 1;
2101 desc = (struct reiserfs_journal_desc *)d_bh->b_data;
2102 trans_offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2103 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1037: "
2104 "journal_read_transaction, offset %llu, len %d mount_id %d",
2105 d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2106 get_desc_trans_len(desc), get_desc_mount_id(desc));
2107 if (get_desc_trans_id(desc) < oldest_trans_id) {
2108 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1039: "
2109 "journal_read_trans skipping because %lu is too old",
2110 cur_dblock -
2111 SB_ONDISK_JOURNAL_1st_BLOCK(sb));
2112 brelse(d_bh);
2113 return 1;
2114 }
2115 if (get_desc_mount_id(desc) != newest_mount_id) {
2116 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1146: "
2117 "journal_read_trans skipping because %d is != "
2118 "newest_mount_id %lu", get_desc_mount_id(desc),
2119 newest_mount_id);
2120 brelse(d_bh);
2121 return 1;
2122 }
2123 c_bh = journal_bread(sb, SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2124 ((trans_offset + get_desc_trans_len(desc) + 1) %
2125 SB_ONDISK_JOURNAL_SIZE(sb)));
2126 if (!c_bh) {
2127 brelse(d_bh);
2128 return 1;
2129 }
2130 commit = (struct reiserfs_journal_commit *)c_bh->b_data;
2131 if (journal_compare_desc_commit(sb, desc, commit)) {
2132 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2133 "journal_read_transaction, "
2134 "commit offset %llu had bad time %d or length %d",
2135 c_bh->b_blocknr -
2136 SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2137 get_commit_trans_id(commit),
2138 get_commit_trans_len(commit));
2139 brelse(c_bh);
2140 brelse(d_bh);
2141 return 1;
2142 }
2143
2144 if (bdev_read_only(sb->s_bdev)) {
2145 reiserfs_warning(sb, "clm-2076",
2146 "device is readonly, unable to replay log");
2147 brelse(c_bh);
2148 brelse(d_bh);
2149 return -EROFS;
2150 }
2151
2152 trans_id = get_desc_trans_id(desc);
2153 /* now we know we've got a good transaction, and it was inside the valid time ranges */
2154 log_blocks = kmalloc(get_desc_trans_len(desc) *
2155 sizeof(struct buffer_head *), GFP_NOFS);
2156 real_blocks = kmalloc(get_desc_trans_len(desc) *
2157 sizeof(struct buffer_head *), GFP_NOFS);
2158 if (!log_blocks || !real_blocks) {
2159 brelse(c_bh);
2160 brelse(d_bh);
2161 kfree(log_blocks);
2162 kfree(real_blocks);
2163 reiserfs_warning(sb, "journal-1169",
2164 "kmalloc failed, unable to mount FS");
2165 return -1;
2166 }
2167 /* get all the buffer heads */
2168 trans_half = journal_trans_half(sb->s_blocksize);
2169 for (i = 0; i < get_desc_trans_len(desc); i++) {
2170 log_blocks[i] =
2171 journal_getblk(sb,
2172 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2173 (trans_offset + 1 +
2174 i) % SB_ONDISK_JOURNAL_SIZE(sb));
2175 if (i < trans_half) {
2176 real_blocks[i] =
2177 sb_getblk(sb,
2178 le32_to_cpu(desc->j_realblock[i]));
2179 } else {
2180 real_blocks[i] =
2181 sb_getblk(sb,
2182 le32_to_cpu(commit->
2183 j_realblock[i - trans_half]));
2184 }
2185 if (real_blocks[i]->b_blocknr > SB_BLOCK_COUNT(sb)) {
2186 reiserfs_warning(sb, "journal-1207",
2187 "REPLAY FAILURE fsck required! "
2188 "Block to replay is outside of "
2189 "filesystem");
2190 goto abort_replay;
2191 }
2192 /* make sure we don't try to replay onto log or reserved area */
2193 if (is_block_in_log_or_reserved_area
2194 (sb, real_blocks[i]->b_blocknr)) {
2195 reiserfs_warning(sb, "journal-1204",
2196 "REPLAY FAILURE fsck required! "
2197 "Trying to replay onto a log block");
2198 abort_replay:
2199 brelse_array(log_blocks, i);
2200 brelse_array(real_blocks, i);
2201 brelse(c_bh);
2202 brelse(d_bh);
2203 kfree(log_blocks);
2204 kfree(real_blocks);
2205 return -1;
2206 }
2207 }
2208 /* read in the log blocks, memcpy to the corresponding real block */
2209 ll_rw_block(READ, get_desc_trans_len(desc), log_blocks);
2210 for (i = 0; i < get_desc_trans_len(desc); i++) {
2211
2212 reiserfs_write_unlock(sb);
2213 wait_on_buffer(log_blocks[i]);
2214 reiserfs_write_lock(sb);
2215
2216 if (!buffer_uptodate(log_blocks[i])) {
2217 reiserfs_warning(sb, "journal-1212",
2218 "REPLAY FAILURE fsck required! "
2219 "buffer write failed");
2220 brelse_array(log_blocks + i,
2221 get_desc_trans_len(desc) - i);
2222 brelse_array(real_blocks, get_desc_trans_len(desc));
2223 brelse(c_bh);
2224 brelse(d_bh);
2225 kfree(log_blocks);
2226 kfree(real_blocks);
2227 return -1;
2228 }
2229 memcpy(real_blocks[i]->b_data, log_blocks[i]->b_data,
2230 real_blocks[i]->b_size);
2231 set_buffer_uptodate(real_blocks[i]);
2232 brelse(log_blocks[i]);
2233 }
2234 /* flush out the real blocks */
2235 for (i = 0; i < get_desc_trans_len(desc); i++) {
2236 set_buffer_dirty(real_blocks[i]);
2237 write_dirty_buffer(real_blocks[i], WRITE);
2238 }
2239 for (i = 0; i < get_desc_trans_len(desc); i++) {
2240 wait_on_buffer(real_blocks[i]);
2241 if (!buffer_uptodate(real_blocks[i])) {
2242 reiserfs_warning(sb, "journal-1226",
2243 "REPLAY FAILURE, fsck required! "
2244 "buffer write failed");
2245 brelse_array(real_blocks + i,
2246 get_desc_trans_len(desc) - i);
2247 brelse(c_bh);
2248 brelse(d_bh);
2249 kfree(log_blocks);
2250 kfree(real_blocks);
2251 return -1;
2252 }
2253 brelse(real_blocks[i]);
2254 }
2255 cur_dblock =
2256 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2257 ((trans_offset + get_desc_trans_len(desc) +
2258 2) % SB_ONDISK_JOURNAL_SIZE(sb));
2259 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2260 "journal-1095: setting journal " "start to offset %ld",
2261 cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb));
2262
2263 /* init starting values for the first transaction, in case this is the last transaction to be replayed. */
2264 journal->j_start = cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2265 journal->j_last_flush_trans_id = trans_id;
2266 journal->j_trans_id = trans_id + 1;
2267 /* check for trans_id overflow */
2268 if (journal->j_trans_id == 0)
2269 journal->j_trans_id = 10;
2270 brelse(c_bh);
2271 brelse(d_bh);
2272 kfree(log_blocks);
2273 kfree(real_blocks);
2274 return 0;
2275}
2276
2277/* This function reads blocks starting from block and to max_block of bufsize
2278 size (but no more than BUFNR blocks at a time). This proved to improve
2279 mounting speed on self-rebuilding raid5 arrays at least.
2280 Right now it is only used from journal code. But later we might use it
2281 from other places.
2282 Note: Do not use journal_getblk/sb_getblk functions here! */
2283static struct buffer_head *reiserfs_breada(struct block_device *dev,
2284 b_blocknr_t block, int bufsize,
2285 b_blocknr_t max_block)
2286{
2287 struct buffer_head *bhlist[BUFNR];
2288 unsigned int blocks = BUFNR;
2289 struct buffer_head *bh;
2290 int i, j;
2291
2292 bh = __getblk(dev, block, bufsize);
2293 if (buffer_uptodate(bh))
2294 return (bh);
2295
2296 if (block + BUFNR > max_block) {
2297 blocks = max_block - block;
2298 }
2299 bhlist[0] = bh;
2300 j = 1;
2301 for (i = 1; i < blocks; i++) {
2302 bh = __getblk(dev, block + i, bufsize);
2303 if (buffer_uptodate(bh)) {
2304 brelse(bh);
2305 break;
2306 } else
2307 bhlist[j++] = bh;
2308 }
2309 ll_rw_block(READ, j, bhlist);
2310 for (i = 1; i < j; i++)
2311 brelse(bhlist[i]);
2312 bh = bhlist[0];
2313 wait_on_buffer(bh);
2314 if (buffer_uptodate(bh))
2315 return bh;
2316 brelse(bh);
2317 return NULL;
2318}
2319
2320/*
2321** read and replay the log
2322** on a clean unmount, the journal header's next unflushed pointer will be to an invalid
2323** transaction. This tests that before finding all the transactions in the log, which makes normal mount times fast.
2324**
2325** After a crash, this starts with the next unflushed transaction, and replays until it finds one too old, or invalid.
2326**
2327** On exit, it sets things up so the first transaction will work correctly.
2328*/
2329static int journal_read(struct super_block *sb)
2330{
2331 struct reiserfs_journal *journal = SB_JOURNAL(sb);
2332 struct reiserfs_journal_desc *desc;
2333 unsigned int oldest_trans_id = 0;
2334 unsigned int oldest_invalid_trans_id = 0;
2335 time_t start;
2336 unsigned long oldest_start = 0;
2337 unsigned long cur_dblock = 0;
2338 unsigned long newest_mount_id = 9;
2339 struct buffer_head *d_bh;
2340 struct reiserfs_journal_header *jh;
2341 int valid_journal_header = 0;
2342 int replay_count = 0;
2343 int continue_replay = 1;
2344 int ret;
2345 char b[BDEVNAME_SIZE];
2346
2347 cur_dblock = SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2348 reiserfs_info(sb, "checking transaction log (%s)\n",
2349 bdevname(journal->j_dev_bd, b));
2350 start = get_seconds();
2351
2352 /* step 1, read in the journal header block. Check the transaction it says
2353 ** is the first unflushed, and if that transaction is not valid,
2354 ** replay is done
2355 */
2356 journal->j_header_bh = journal_bread(sb,
2357 SB_ONDISK_JOURNAL_1st_BLOCK(sb)
2358 + SB_ONDISK_JOURNAL_SIZE(sb));
2359 if (!journal->j_header_bh) {
2360 return 1;
2361 }
2362 jh = (struct reiserfs_journal_header *)(journal->j_header_bh->b_data);
2363 if (le32_to_cpu(jh->j_first_unflushed_offset) <
2364 SB_ONDISK_JOURNAL_SIZE(sb)
2365 && le32_to_cpu(jh->j_last_flush_trans_id) > 0) {
2366 oldest_start =
2367 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2368 le32_to_cpu(jh->j_first_unflushed_offset);
2369 oldest_trans_id = le32_to_cpu(jh->j_last_flush_trans_id) + 1;
2370 newest_mount_id = le32_to_cpu(jh->j_mount_id);
2371 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2372 "journal-1153: found in "
2373 "header: first_unflushed_offset %d, last_flushed_trans_id "
2374 "%lu", le32_to_cpu(jh->j_first_unflushed_offset),
2375 le32_to_cpu(jh->j_last_flush_trans_id));
2376 valid_journal_header = 1;
2377
2378 /* now, we try to read the first unflushed offset. If it is not valid,
2379 ** there is nothing more we can do, and it makes no sense to read
2380 ** through the whole log.
2381 */
2382 d_bh =
2383 journal_bread(sb,
2384 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2385 le32_to_cpu(jh->j_first_unflushed_offset));
2386 ret = journal_transaction_is_valid(sb, d_bh, NULL, NULL);
2387 if (!ret) {
2388 continue_replay = 0;
2389 }
2390 brelse(d_bh);
2391 goto start_log_replay;
2392 }
2393
2394 /* ok, there are transactions that need to be replayed. start with the first log block, find
2395 ** all the valid transactions, and pick out the oldest.
2396 */
2397 while (continue_replay
2398 && cur_dblock <
2399 (SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2400 SB_ONDISK_JOURNAL_SIZE(sb))) {
2401 /* Note that it is required for blocksize of primary fs device and journal
2402 device to be the same */
2403 d_bh =
2404 reiserfs_breada(journal->j_dev_bd, cur_dblock,
2405 sb->s_blocksize,
2406 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2407 SB_ONDISK_JOURNAL_SIZE(sb));
2408 ret =
2409 journal_transaction_is_valid(sb, d_bh,
2410 &oldest_invalid_trans_id,
2411 &newest_mount_id);
2412 if (ret == 1) {
2413 desc = (struct reiserfs_journal_desc *)d_bh->b_data;
2414 if (oldest_start == 0) { /* init all oldest_ values */
2415 oldest_trans_id = get_desc_trans_id(desc);
2416 oldest_start = d_bh->b_blocknr;
2417 newest_mount_id = get_desc_mount_id(desc);
2418 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2419 "journal-1179: Setting "
2420 "oldest_start to offset %llu, trans_id %lu",
2421 oldest_start -
2422 SB_ONDISK_JOURNAL_1st_BLOCK
2423 (sb), oldest_trans_id);
2424 } else if (oldest_trans_id > get_desc_trans_id(desc)) {
2425 /* one we just read was older */
2426 oldest_trans_id = get_desc_trans_id(desc);
2427 oldest_start = d_bh->b_blocknr;
2428 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2429 "journal-1180: Resetting "
2430 "oldest_start to offset %lu, trans_id %lu",
2431 oldest_start -
2432 SB_ONDISK_JOURNAL_1st_BLOCK
2433 (sb), oldest_trans_id);
2434 }
2435 if (newest_mount_id < get_desc_mount_id(desc)) {
2436 newest_mount_id = get_desc_mount_id(desc);
2437 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2438 "journal-1299: Setting "
2439 "newest_mount_id to %d",
2440 get_desc_mount_id(desc));
2441 }
2442 cur_dblock += get_desc_trans_len(desc) + 2;
2443 } else {
2444 cur_dblock++;
2445 }
2446 brelse(d_bh);
2447 }
2448
2449 start_log_replay:
2450 cur_dblock = oldest_start;
2451 if (oldest_trans_id) {
2452 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2453 "journal-1206: Starting replay "
2454 "from offset %llu, trans_id %lu",
2455 cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2456 oldest_trans_id);
2457
2458 }
2459 replay_count = 0;
2460 while (continue_replay && oldest_trans_id > 0) {
2461 ret =
2462 journal_read_transaction(sb, cur_dblock, oldest_start,
2463 oldest_trans_id, newest_mount_id);
2464 if (ret < 0) {
2465 return ret;
2466 } else if (ret != 0) {
2467 break;
2468 }
2469 cur_dblock =
2470 SB_ONDISK_JOURNAL_1st_BLOCK(sb) + journal->j_start;
2471 replay_count++;
2472 if (cur_dblock == oldest_start)
2473 break;
2474 }
2475
2476 if (oldest_trans_id == 0) {
2477 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2478 "journal-1225: No valid " "transactions found");
2479 }
2480 /* j_start does not get set correctly if we don't replay any transactions.
2481 ** if we had a valid journal_header, set j_start to the first unflushed transaction value,
2482 ** copy the trans_id from the header
2483 */
2484 if (valid_journal_header && replay_count == 0) {
2485 journal->j_start = le32_to_cpu(jh->j_first_unflushed_offset);
2486 journal->j_trans_id =
2487 le32_to_cpu(jh->j_last_flush_trans_id) + 1;
2488 /* check for trans_id overflow */
2489 if (journal->j_trans_id == 0)
2490 journal->j_trans_id = 10;
2491 journal->j_last_flush_trans_id =
2492 le32_to_cpu(jh->j_last_flush_trans_id);
2493 journal->j_mount_id = le32_to_cpu(jh->j_mount_id) + 1;
2494 } else {
2495 journal->j_mount_id = newest_mount_id + 1;
2496 }
2497 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1299: Setting "
2498 "newest_mount_id to %lu", journal->j_mount_id);
2499 journal->j_first_unflushed_offset = journal->j_start;
2500 if (replay_count > 0) {
2501 reiserfs_info(sb,
2502 "replayed %d transactions in %lu seconds\n",
2503 replay_count, get_seconds() - start);
2504 }
2505 if (!bdev_read_only(sb->s_bdev) &&
2506 _update_journal_header_block(sb, journal->j_start,
2507 journal->j_last_flush_trans_id)) {
2508 /* replay failed, caller must call free_journal_ram and abort
2509 ** the mount
2510 */
2511 return -1;
2512 }
2513 return 0;
2514}
2515
2516static struct reiserfs_journal_list *alloc_journal_list(struct super_block *s)
2517{
2518 struct reiserfs_journal_list *jl;
2519 jl = kzalloc(sizeof(struct reiserfs_journal_list),
2520 GFP_NOFS | __GFP_NOFAIL);
2521 INIT_LIST_HEAD(&jl->j_list);
2522 INIT_LIST_HEAD(&jl->j_working_list);
2523 INIT_LIST_HEAD(&jl->j_tail_bh_list);
2524 INIT_LIST_HEAD(&jl->j_bh_list);
2525 mutex_init(&jl->j_commit_mutex);
2526 SB_JOURNAL(s)->j_num_lists++;
2527 get_journal_list(jl);
2528 return jl;
2529}
2530
2531static void journal_list_init(struct super_block *sb)
2532{
2533 SB_JOURNAL(sb)->j_current_jl = alloc_journal_list(sb);
2534}
2535
2536static int release_journal_dev(struct super_block *super,
2537 struct reiserfs_journal *journal)
2538{
2539 int result;
2540
2541 result = 0;
2542
2543 if (journal->j_dev_bd != NULL) {
2544 result = blkdev_put(journal->j_dev_bd, journal->j_dev_mode);
2545 journal->j_dev_bd = NULL;
2546 }
2547
2548 if (result != 0) {
2549 reiserfs_warning(super, "sh-457",
2550 "Cannot release journal device: %i", result);
2551 }
2552 return result;
2553}
2554
2555static int journal_init_dev(struct super_block *super,
2556 struct reiserfs_journal *journal,
2557 const char *jdev_name)
2558{
2559 int result;
2560 dev_t jdev;
2561 fmode_t blkdev_mode = FMODE_READ | FMODE_WRITE | FMODE_EXCL;
2562 char b[BDEVNAME_SIZE];
2563
2564 result = 0;
2565
2566 journal->j_dev_bd = NULL;
2567 jdev = SB_ONDISK_JOURNAL_DEVICE(super) ?
2568 new_decode_dev(SB_ONDISK_JOURNAL_DEVICE(super)) : super->s_dev;
2569
2570 if (bdev_read_only(super->s_bdev))
2571 blkdev_mode = FMODE_READ;
2572
2573 /* there is no "jdev" option and journal is on separate device */
2574 if ((!jdev_name || !jdev_name[0])) {
2575 if (jdev == super->s_dev)
2576 blkdev_mode &= ~FMODE_EXCL;
2577 journal->j_dev_bd = blkdev_get_by_dev(jdev, blkdev_mode,
2578 journal);
2579 journal->j_dev_mode = blkdev_mode;
2580 if (IS_ERR(journal->j_dev_bd)) {
2581 result = PTR_ERR(journal->j_dev_bd);
2582 journal->j_dev_bd = NULL;
2583 reiserfs_warning(super, "sh-458",
2584 "cannot init journal device '%s': %i",
2585 __bdevname(jdev, b), result);
2586 return result;
2587 } else if (jdev != super->s_dev)
2588 set_blocksize(journal->j_dev_bd, super->s_blocksize);
2589
2590 return 0;
2591 }
2592
2593 journal->j_dev_mode = blkdev_mode;
2594 journal->j_dev_bd = blkdev_get_by_path(jdev_name, blkdev_mode, journal);
2595 if (IS_ERR(journal->j_dev_bd)) {
2596 result = PTR_ERR(journal->j_dev_bd);
2597 journal->j_dev_bd = NULL;
2598 reiserfs_warning(super,
2599 "journal_init_dev: Cannot open '%s': %i",
2600 jdev_name, result);
2601 return result;
2602 }
2603
2604 set_blocksize(journal->j_dev_bd, super->s_blocksize);
2605 reiserfs_info(super,
2606 "journal_init_dev: journal device: %s\n",
2607 bdevname(journal->j_dev_bd, b));
2608 return 0;
2609}
2610
2611/**
2612 * When creating/tuning a file system user can assign some
2613 * journal params within boundaries which depend on the ratio
2614 * blocksize/standard_blocksize.
2615 *
2616 * For blocks >= standard_blocksize transaction size should
2617 * be not less then JOURNAL_TRANS_MIN_DEFAULT, and not more
2618 * then JOURNAL_TRANS_MAX_DEFAULT.
2619 *
2620 * For blocks < standard_blocksize these boundaries should be
2621 * decreased proportionally.
2622 */
2623#define REISERFS_STANDARD_BLKSIZE (4096)
2624
2625static int check_advise_trans_params(struct super_block *sb,
2626 struct reiserfs_journal *journal)
2627{
2628 if (journal->j_trans_max) {
2629 /* Non-default journal params.
2630 Do sanity check for them. */
2631 int ratio = 1;
2632 if (sb->s_blocksize < REISERFS_STANDARD_BLKSIZE)
2633 ratio = REISERFS_STANDARD_BLKSIZE / sb->s_blocksize;
2634
2635 if (journal->j_trans_max > JOURNAL_TRANS_MAX_DEFAULT / ratio ||
2636 journal->j_trans_max < JOURNAL_TRANS_MIN_DEFAULT / ratio ||
2637 SB_ONDISK_JOURNAL_SIZE(sb) / journal->j_trans_max <
2638 JOURNAL_MIN_RATIO) {
2639 reiserfs_warning(sb, "sh-462",
2640 "bad transaction max size (%u). "
2641 "FSCK?", journal->j_trans_max);
2642 return 1;
2643 }
2644 if (journal->j_max_batch != (journal->j_trans_max) *
2645 JOURNAL_MAX_BATCH_DEFAULT/JOURNAL_TRANS_MAX_DEFAULT) {
2646 reiserfs_warning(sb, "sh-463",
2647 "bad transaction max batch (%u). "
2648 "FSCK?", journal->j_max_batch);
2649 return 1;
2650 }
2651 } else {
2652 /* Default journal params.
2653 The file system was created by old version
2654 of mkreiserfs, so some fields contain zeros,
2655 and we need to advise proper values for them */
2656 if (sb->s_blocksize != REISERFS_STANDARD_BLKSIZE) {
2657 reiserfs_warning(sb, "sh-464", "bad blocksize (%u)",
2658 sb->s_blocksize);
2659 return 1;
2660 }
2661 journal->j_trans_max = JOURNAL_TRANS_MAX_DEFAULT;
2662 journal->j_max_batch = JOURNAL_MAX_BATCH_DEFAULT;
2663 journal->j_max_commit_age = JOURNAL_MAX_COMMIT_AGE;
2664 }
2665 return 0;
2666}
2667
2668/*
2669** must be called once on fs mount. calls journal_read for you
2670*/
2671int journal_init(struct super_block *sb, const char *j_dev_name,
2672 int old_format, unsigned int commit_max_age)
2673{
2674 int num_cnodes = SB_ONDISK_JOURNAL_SIZE(sb) * 2;
2675 struct buffer_head *bhjh;
2676 struct reiserfs_super_block *rs;
2677 struct reiserfs_journal_header *jh;
2678 struct reiserfs_journal *journal;
2679 struct reiserfs_journal_list *jl;
2680 char b[BDEVNAME_SIZE];
2681 int ret;
2682
2683 /*
2684 * Unlock here to avoid various RECLAIM-FS-ON <-> IN-RECLAIM-FS
2685 * dependency inversion warnings.
2686 */
2687 reiserfs_write_unlock(sb);
2688 journal = SB_JOURNAL(sb) = vmalloc(sizeof(struct reiserfs_journal));
2689 if (!journal) {
2690 reiserfs_warning(sb, "journal-1256",
2691 "unable to get memory for journal structure");
2692 reiserfs_write_lock(sb);
2693 return 1;
2694 }
2695 memset(journal, 0, sizeof(struct reiserfs_journal));
2696 INIT_LIST_HEAD(&journal->j_bitmap_nodes);
2697 INIT_LIST_HEAD(&journal->j_prealloc_list);
2698 INIT_LIST_HEAD(&journal->j_working_list);
2699 INIT_LIST_HEAD(&journal->j_journal_list);
2700 journal->j_persistent_trans = 0;
2701 ret = reiserfs_allocate_list_bitmaps(sb, journal->j_list_bitmap,
2702 reiserfs_bmap_count(sb));
2703 reiserfs_write_lock(sb);
2704 if (ret)
2705 goto free_and_return;
2706
2707 allocate_bitmap_nodes(sb);
2708
2709 /* reserved for journal area support */
2710 SB_JOURNAL_1st_RESERVED_BLOCK(sb) = (old_format ?
2711 REISERFS_OLD_DISK_OFFSET_IN_BYTES
2712 / sb->s_blocksize +
2713 reiserfs_bmap_count(sb) +
2714 1 :
2715 REISERFS_DISK_OFFSET_IN_BYTES /
2716 sb->s_blocksize + 2);
2717
2718 /* Sanity check to see is the standard journal fitting within first bitmap
2719 (actual for small blocksizes) */
2720 if (!SB_ONDISK_JOURNAL_DEVICE(sb) &&
2721 (SB_JOURNAL_1st_RESERVED_BLOCK(sb) +
2722 SB_ONDISK_JOURNAL_SIZE(sb) > sb->s_blocksize * 8)) {
2723 reiserfs_warning(sb, "journal-1393",
2724 "journal does not fit for area addressed "
2725 "by first of bitmap blocks. It starts at "
2726 "%u and its size is %u. Block size %ld",
2727 SB_JOURNAL_1st_RESERVED_BLOCK(sb),
2728 SB_ONDISK_JOURNAL_SIZE(sb),
2729 sb->s_blocksize);
2730 goto free_and_return;
2731 }
2732
2733 /*
2734 * We need to unlock here to avoid creating the following
2735 * dependency:
2736 * reiserfs_lock -> sysfs_mutex
2737 * Because the reiserfs mmap path creates the following dependency:
2738 * mm->mmap -> reiserfs_lock, hence we have
2739 * mm->mmap -> reiserfs_lock ->sysfs_mutex
2740 * This would ends up in a circular dependency with sysfs readdir path
2741 * which does sysfs_mutex -> mm->mmap_sem
2742 * This is fine because the reiserfs lock is useless in mount path,
2743 * at least until we call journal_begin. We keep it for paranoid
2744 * reasons.
2745 */
2746 reiserfs_write_unlock(sb);
2747 if (journal_init_dev(sb, journal, j_dev_name) != 0) {
2748 reiserfs_write_lock(sb);
2749 reiserfs_warning(sb, "sh-462",
2750 "unable to initialize jornal device");
2751 goto free_and_return;
2752 }
2753 reiserfs_write_lock(sb);
2754
2755 rs = SB_DISK_SUPER_BLOCK(sb);
2756
2757 /* read journal header */
2758 bhjh = journal_bread(sb,
2759 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2760 SB_ONDISK_JOURNAL_SIZE(sb));
2761 if (!bhjh) {
2762 reiserfs_warning(sb, "sh-459",
2763 "unable to read journal header");
2764 goto free_and_return;
2765 }
2766 jh = (struct reiserfs_journal_header *)(bhjh->b_data);
2767
2768 /* make sure that journal matches to the super block */
2769 if (is_reiserfs_jr(rs)
2770 && (le32_to_cpu(jh->jh_journal.jp_journal_magic) !=
2771 sb_jp_journal_magic(rs))) {
2772 reiserfs_warning(sb, "sh-460",
2773 "journal header magic %x (device %s) does "
2774 "not match to magic found in super block %x",
2775 jh->jh_journal.jp_journal_magic,
2776 bdevname(journal->j_dev_bd, b),
2777 sb_jp_journal_magic(rs));
2778 brelse(bhjh);
2779 goto free_and_return;
2780 }
2781
2782 journal->j_trans_max = le32_to_cpu(jh->jh_journal.jp_journal_trans_max);
2783 journal->j_max_batch = le32_to_cpu(jh->jh_journal.jp_journal_max_batch);
2784 journal->j_max_commit_age =
2785 le32_to_cpu(jh->jh_journal.jp_journal_max_commit_age);
2786 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
2787
2788 if (check_advise_trans_params(sb, journal) != 0)
2789 goto free_and_return;
2790 journal->j_default_max_commit_age = journal->j_max_commit_age;
2791
2792 if (commit_max_age != 0) {
2793 journal->j_max_commit_age = commit_max_age;
2794 journal->j_max_trans_age = commit_max_age;
2795 }
2796
2797 reiserfs_info(sb, "journal params: device %s, size %u, "
2798 "journal first block %u, max trans len %u, max batch %u, "
2799 "max commit age %u, max trans age %u\n",
2800 bdevname(journal->j_dev_bd, b),
2801 SB_ONDISK_JOURNAL_SIZE(sb),
2802 SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2803 journal->j_trans_max,
2804 journal->j_max_batch,
2805 journal->j_max_commit_age, journal->j_max_trans_age);
2806
2807 brelse(bhjh);
2808
2809 journal->j_list_bitmap_index = 0;
2810 journal_list_init(sb);
2811
2812 memset(journal->j_list_hash_table, 0,
2813 JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *));
2814
2815 INIT_LIST_HEAD(&journal->j_dirty_buffers);
2816 spin_lock_init(&journal->j_dirty_buffers_lock);
2817
2818 journal->j_start = 0;
2819 journal->j_len = 0;
2820 journal->j_len_alloc = 0;
2821 atomic_set(&(journal->j_wcount), 0);
2822 atomic_set(&(journal->j_async_throttle), 0);
2823 journal->j_bcount = 0;
2824 journal->j_trans_start_time = 0;
2825 journal->j_last = NULL;
2826 journal->j_first = NULL;
2827 init_waitqueue_head(&(journal->j_join_wait));
2828 mutex_init(&journal->j_mutex);
2829 mutex_init(&journal->j_flush_mutex);
2830
2831 journal->j_trans_id = 10;
2832 journal->j_mount_id = 10;
2833 journal->j_state = 0;
2834 atomic_set(&(journal->j_jlock), 0);
2835 reiserfs_write_unlock(sb);
2836 journal->j_cnode_free_list = allocate_cnodes(num_cnodes);
2837 reiserfs_write_lock(sb);
2838 journal->j_cnode_free_orig = journal->j_cnode_free_list;
2839 journal->j_cnode_free = journal->j_cnode_free_list ? num_cnodes : 0;
2840 journal->j_cnode_used = 0;
2841 journal->j_must_wait = 0;
2842
2843 if (journal->j_cnode_free == 0) {
2844 reiserfs_warning(sb, "journal-2004", "Journal cnode memory "
2845 "allocation failed (%ld bytes). Journal is "
2846 "too large for available memory. Usually "
2847 "this is due to a journal that is too large.",
2848 sizeof (struct reiserfs_journal_cnode) * num_cnodes);
2849 goto free_and_return;
2850 }
2851
2852 init_journal_hash(sb);
2853 jl = journal->j_current_jl;
2854 jl->j_list_bitmap = get_list_bitmap(sb, jl);
2855 if (!jl->j_list_bitmap) {
2856 reiserfs_warning(sb, "journal-2005",
2857 "get_list_bitmap failed for journal list 0");
2858 goto free_and_return;
2859 }
2860 if (journal_read(sb) < 0) {
2861 reiserfs_warning(sb, "reiserfs-2006",
2862 "Replay Failure, unable to mount");
2863 goto free_and_return;
2864 }
2865
2866 reiserfs_mounted_fs_count++;
2867 if (reiserfs_mounted_fs_count <= 1) {
2868 reiserfs_write_unlock(sb);
2869 commit_wq = alloc_workqueue("reiserfs", WQ_MEM_RECLAIM, 0);
2870 reiserfs_write_lock(sb);
2871 }
2872
2873 INIT_DELAYED_WORK(&journal->j_work, flush_async_commits);
2874 journal->j_work_sb = sb;
2875 return 0;
2876 free_and_return:
2877 free_journal_ram(sb);
2878 return 1;
2879}
2880
2881/*
2882** test for a polite end of the current transaction. Used by file_write, and should
2883** be used by delete to make sure they don't write more than can fit inside a single
2884** transaction
2885*/
2886int journal_transaction_should_end(struct reiserfs_transaction_handle *th,
2887 int new_alloc)
2888{
2889 struct reiserfs_journal *journal = SB_JOURNAL(th->t_super);
2890 time_t now = get_seconds();
2891 /* cannot restart while nested */
2892 BUG_ON(!th->t_trans_id);
2893 if (th->t_refcount > 1)
2894 return 0;
2895 if (journal->j_must_wait > 0 ||
2896 (journal->j_len_alloc + new_alloc) >= journal->j_max_batch ||
2897 atomic_read(&(journal->j_jlock)) ||
2898 (now - journal->j_trans_start_time) > journal->j_max_trans_age ||
2899 journal->j_cnode_free < (journal->j_trans_max * 3)) {
2900 return 1;
2901 }
2902 /* protected by the BKL here */
2903 journal->j_len_alloc += new_alloc;
2904 th->t_blocks_allocated += new_alloc ;
2905 return 0;
2906}
2907
2908/* this must be called inside a transaction, and requires the
2909** kernel_lock to be held
2910*/
2911void reiserfs_block_writes(struct reiserfs_transaction_handle *th)
2912{
2913 struct reiserfs_journal *journal = SB_JOURNAL(th->t_super);
2914 BUG_ON(!th->t_trans_id);
2915 journal->j_must_wait = 1;
2916 set_bit(J_WRITERS_BLOCKED, &journal->j_state);
2917 return;
2918}
2919
2920/* this must be called without a transaction started, and does not
2921** require BKL
2922*/
2923void reiserfs_allow_writes(struct super_block *s)
2924{
2925 struct reiserfs_journal *journal = SB_JOURNAL(s);
2926 clear_bit(J_WRITERS_BLOCKED, &journal->j_state);
2927 wake_up(&journal->j_join_wait);
2928}
2929
2930/* this must be called without a transaction started, and does not
2931** require BKL
2932*/
2933void reiserfs_wait_on_write_block(struct super_block *s)
2934{
2935 struct reiserfs_journal *journal = SB_JOURNAL(s);
2936 wait_event(journal->j_join_wait,
2937 !test_bit(J_WRITERS_BLOCKED, &journal->j_state));
2938}
2939
2940static void queue_log_writer(struct super_block *s)
2941{
2942 wait_queue_t wait;
2943 struct reiserfs_journal *journal = SB_JOURNAL(s);
2944 set_bit(J_WRITERS_QUEUED, &journal->j_state);
2945
2946 /*
2947 * we don't want to use wait_event here because
2948 * we only want to wait once.
2949 */
2950 init_waitqueue_entry(&wait, current);
2951 add_wait_queue(&journal->j_join_wait, &wait);
2952 set_current_state(TASK_UNINTERRUPTIBLE);
2953 if (test_bit(J_WRITERS_QUEUED, &journal->j_state)) {
2954 reiserfs_write_unlock(s);
2955 schedule();
2956 reiserfs_write_lock(s);
2957 }
2958 __set_current_state(TASK_RUNNING);
2959 remove_wait_queue(&journal->j_join_wait, &wait);
2960}
2961
2962static void wake_queued_writers(struct super_block *s)
2963{
2964 struct reiserfs_journal *journal = SB_JOURNAL(s);
2965 if (test_and_clear_bit(J_WRITERS_QUEUED, &journal->j_state))
2966 wake_up(&journal->j_join_wait);
2967}
2968
2969static void let_transaction_grow(struct super_block *sb, unsigned int trans_id)
2970{
2971 struct reiserfs_journal *journal = SB_JOURNAL(sb);
2972 unsigned long bcount = journal->j_bcount;
2973 while (1) {
2974 reiserfs_write_unlock(sb);
2975 schedule_timeout_uninterruptible(1);
2976 reiserfs_write_lock(sb);
2977 journal->j_current_jl->j_state |= LIST_COMMIT_PENDING;
2978 while ((atomic_read(&journal->j_wcount) > 0 ||
2979 atomic_read(&journal->j_jlock)) &&
2980 journal->j_trans_id == trans_id) {
2981 queue_log_writer(sb);
2982 }
2983 if (journal->j_trans_id != trans_id)
2984 break;
2985 if (bcount == journal->j_bcount)
2986 break;
2987 bcount = journal->j_bcount;
2988 }
2989}
2990
2991/* join == true if you must join an existing transaction.
2992** join == false if you can deal with waiting for others to finish
2993**
2994** this will block until the transaction is joinable. send the number of blocks you
2995** expect to use in nblocks.
2996*/
2997static int do_journal_begin_r(struct reiserfs_transaction_handle *th,
2998 struct super_block *sb, unsigned long nblocks,
2999 int join)
3000{
3001 time_t now = get_seconds();
3002 unsigned int old_trans_id;
3003 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3004 struct reiserfs_transaction_handle myth;
3005 int sched_count = 0;
3006 int retval;
3007
3008 reiserfs_check_lock_depth(sb, "journal_begin");
3009 BUG_ON(nblocks > journal->j_trans_max);
3010
3011 PROC_INFO_INC(sb, journal.journal_being);
3012 /* set here for journal_join */
3013 th->t_refcount = 1;
3014 th->t_super = sb;
3015
3016 relock:
3017 lock_journal(sb);
3018 if (join != JBEGIN_ABORT && reiserfs_is_journal_aborted(journal)) {
3019 unlock_journal(sb);
3020 retval = journal->j_errno;
3021 goto out_fail;
3022 }
3023 journal->j_bcount++;
3024
3025 if (test_bit(J_WRITERS_BLOCKED, &journal->j_state)) {
3026 unlock_journal(sb);
3027 reiserfs_write_unlock(sb);
3028 reiserfs_wait_on_write_block(sb);
3029 reiserfs_write_lock(sb);
3030 PROC_INFO_INC(sb, journal.journal_relock_writers);
3031 goto relock;
3032 }
3033 now = get_seconds();
3034
3035 /* if there is no room in the journal OR
3036 ** if this transaction is too old, and we weren't called joinable, wait for it to finish before beginning
3037 ** we don't sleep if there aren't other writers
3038 */
3039
3040 if ((!join && journal->j_must_wait > 0) ||
3041 (!join
3042 && (journal->j_len_alloc + nblocks + 2) >= journal->j_max_batch)
3043 || (!join && atomic_read(&journal->j_wcount) > 0
3044 && journal->j_trans_start_time > 0
3045 && (now - journal->j_trans_start_time) >
3046 journal->j_max_trans_age) || (!join
3047 && atomic_read(&journal->j_jlock))
3048 || (!join && journal->j_cnode_free < (journal->j_trans_max * 3))) {
3049
3050 old_trans_id = journal->j_trans_id;
3051 unlock_journal(sb); /* allow others to finish this transaction */
3052
3053 if (!join && (journal->j_len_alloc + nblocks + 2) >=
3054 journal->j_max_batch &&
3055 ((journal->j_len + nblocks + 2) * 100) <
3056 (journal->j_len_alloc * 75)) {
3057 if (atomic_read(&journal->j_wcount) > 10) {
3058 sched_count++;
3059 queue_log_writer(sb);
3060 goto relock;
3061 }
3062 }
3063 /* don't mess with joining the transaction if all we have to do is
3064 * wait for someone else to do a commit
3065 */
3066 if (atomic_read(&journal->j_jlock)) {
3067 while (journal->j_trans_id == old_trans_id &&
3068 atomic_read(&journal->j_jlock)) {
3069 queue_log_writer(sb);
3070 }
3071 goto relock;
3072 }
3073 retval = journal_join(&myth, sb, 1);
3074 if (retval)
3075 goto out_fail;
3076
3077 /* someone might have ended the transaction while we joined */
3078 if (old_trans_id != journal->j_trans_id) {
3079 retval = do_journal_end(&myth, sb, 1, 0);
3080 } else {
3081 retval = do_journal_end(&myth, sb, 1, COMMIT_NOW);
3082 }
3083
3084 if (retval)
3085 goto out_fail;
3086
3087 PROC_INFO_INC(sb, journal.journal_relock_wcount);
3088 goto relock;
3089 }
3090 /* we are the first writer, set trans_id */
3091 if (journal->j_trans_start_time == 0) {
3092 journal->j_trans_start_time = get_seconds();
3093 }
3094 atomic_inc(&(journal->j_wcount));
3095 journal->j_len_alloc += nblocks;
3096 th->t_blocks_logged = 0;
3097 th->t_blocks_allocated = nblocks;
3098 th->t_trans_id = journal->j_trans_id;
3099 unlock_journal(sb);
3100 INIT_LIST_HEAD(&th->t_list);
3101 return 0;
3102
3103 out_fail:
3104 memset(th, 0, sizeof(*th));
3105 /* Re-set th->t_super, so we can properly keep track of how many
3106 * persistent transactions there are. We need to do this so if this
3107 * call is part of a failed restart_transaction, we can free it later */
3108 th->t_super = sb;
3109 return retval;
3110}
3111
3112struct reiserfs_transaction_handle *reiserfs_persistent_transaction(struct
3113 super_block
3114 *s,
3115 int nblocks)
3116{
3117 int ret;
3118 struct reiserfs_transaction_handle *th;
3119
3120 /* if we're nesting into an existing transaction. It will be
3121 ** persistent on its own
3122 */
3123 if (reiserfs_transaction_running(s)) {
3124 th = current->journal_info;
3125 th->t_refcount++;
3126 BUG_ON(th->t_refcount < 2);
3127
3128 return th;
3129 }
3130 th = kmalloc(sizeof(struct reiserfs_transaction_handle), GFP_NOFS);
3131 if (!th)
3132 return NULL;
3133 ret = journal_begin(th, s, nblocks);
3134 if (ret) {
3135 kfree(th);
3136 return NULL;
3137 }
3138
3139 SB_JOURNAL(s)->j_persistent_trans++;
3140 return th;
3141}
3142
3143int reiserfs_end_persistent_transaction(struct reiserfs_transaction_handle *th)
3144{
3145 struct super_block *s = th->t_super;
3146 int ret = 0;
3147 if (th->t_trans_id)
3148 ret = journal_end(th, th->t_super, th->t_blocks_allocated);
3149 else
3150 ret = -EIO;
3151 if (th->t_refcount == 0) {
3152 SB_JOURNAL(s)->j_persistent_trans--;
3153 kfree(th);
3154 }
3155 return ret;
3156}
3157
3158static int journal_join(struct reiserfs_transaction_handle *th,
3159 struct super_block *sb, unsigned long nblocks)
3160{
3161 struct reiserfs_transaction_handle *cur_th = current->journal_info;
3162
3163 /* this keeps do_journal_end from NULLing out the current->journal_info
3164 ** pointer
3165 */
3166 th->t_handle_save = cur_th;
3167 BUG_ON(cur_th && cur_th->t_refcount > 1);
3168 return do_journal_begin_r(th, sb, nblocks, JBEGIN_JOIN);
3169}
3170
3171int journal_join_abort(struct reiserfs_transaction_handle *th,
3172 struct super_block *sb, unsigned long nblocks)
3173{
3174 struct reiserfs_transaction_handle *cur_th = current->journal_info;
3175
3176 /* this keeps do_journal_end from NULLing out the current->journal_info
3177 ** pointer
3178 */
3179 th->t_handle_save = cur_th;
3180 BUG_ON(cur_th && cur_th->t_refcount > 1);
3181 return do_journal_begin_r(th, sb, nblocks, JBEGIN_ABORT);
3182}
3183
3184int journal_begin(struct reiserfs_transaction_handle *th,
3185 struct super_block *sb, unsigned long nblocks)
3186{
3187 struct reiserfs_transaction_handle *cur_th = current->journal_info;
3188 int ret;
3189
3190 th->t_handle_save = NULL;
3191 if (cur_th) {
3192 /* we are nesting into the current transaction */
3193 if (cur_th->t_super == sb) {
3194 BUG_ON(!cur_th->t_refcount);
3195 cur_th->t_refcount++;
3196 memcpy(th, cur_th, sizeof(*th));
3197 if (th->t_refcount <= 1)
3198 reiserfs_warning(sb, "reiserfs-2005",
3199 "BAD: refcount <= 1, but "
3200 "journal_info != 0");
3201 return 0;
3202 } else {
3203 /* we've ended up with a handle from a different filesystem.
3204 ** save it and restore on journal_end. This should never
3205 ** really happen...
3206 */
3207 reiserfs_warning(sb, "clm-2100",
3208 "nesting info a different FS");
3209 th->t_handle_save = current->journal_info;
3210 current->journal_info = th;
3211 }
3212 } else {
3213 current->journal_info = th;
3214 }
3215 ret = do_journal_begin_r(th, sb, nblocks, JBEGIN_REG);
3216 BUG_ON(current->journal_info != th);
3217
3218 /* I guess this boils down to being the reciprocal of clm-2100 above.
3219 * If do_journal_begin_r fails, we need to put it back, since journal_end
3220 * won't be called to do it. */
3221 if (ret)
3222 current->journal_info = th->t_handle_save;
3223 else
3224 BUG_ON(!th->t_refcount);
3225
3226 return ret;
3227}
3228
3229/*
3230** puts bh into the current transaction. If it was already there, reorders removes the
3231** old pointers from the hash, and puts new ones in (to make sure replay happen in the right order).
3232**
3233** if it was dirty, cleans and files onto the clean list. I can't let it be dirty again until the
3234** transaction is committed.
3235**
3236** if j_len, is bigger than j_len_alloc, it pushes j_len_alloc to 10 + j_len.
3237*/
3238int journal_mark_dirty(struct reiserfs_transaction_handle *th,
3239 struct super_block *sb, struct buffer_head *bh)
3240{
3241 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3242 struct reiserfs_journal_cnode *cn = NULL;
3243 int count_already_incd = 0;
3244 int prepared = 0;
3245 BUG_ON(!th->t_trans_id);
3246
3247 PROC_INFO_INC(sb, journal.mark_dirty);
3248 if (th->t_trans_id != journal->j_trans_id) {
3249 reiserfs_panic(th->t_super, "journal-1577",
3250 "handle trans id %ld != current trans id %ld",
3251 th->t_trans_id, journal->j_trans_id);
3252 }
3253
3254 sb->s_dirt = 1;
3255
3256 prepared = test_clear_buffer_journal_prepared(bh);
3257 clear_buffer_journal_restore_dirty(bh);
3258 /* already in this transaction, we are done */
3259 if (buffer_journaled(bh)) {
3260 PROC_INFO_INC(sb, journal.mark_dirty_already);
3261 return 0;
3262 }
3263
3264 /* this must be turned into a panic instead of a warning. We can't allow
3265 ** a dirty or journal_dirty or locked buffer to be logged, as some changes
3266 ** could get to disk too early. NOT GOOD.
3267 */
3268 if (!prepared || buffer_dirty(bh)) {
3269 reiserfs_warning(sb, "journal-1777",
3270 "buffer %llu bad state "
3271 "%cPREPARED %cLOCKED %cDIRTY %cJDIRTY_WAIT",
3272 (unsigned long long)bh->b_blocknr,
3273 prepared ? ' ' : '!',
3274 buffer_locked(bh) ? ' ' : '!',
3275 buffer_dirty(bh) ? ' ' : '!',
3276 buffer_journal_dirty(bh) ? ' ' : '!');
3277 }
3278
3279 if (atomic_read(&(journal->j_wcount)) <= 0) {
3280 reiserfs_warning(sb, "journal-1409",
3281 "returning because j_wcount was %d",
3282 atomic_read(&(journal->j_wcount)));
3283 return 1;
3284 }
3285 /* this error means I've screwed up, and we've overflowed the transaction.
3286 ** Nothing can be done here, except make the FS readonly or panic.
3287 */
3288 if (journal->j_len >= journal->j_trans_max) {
3289 reiserfs_panic(th->t_super, "journal-1413",
3290 "j_len (%lu) is too big",
3291 journal->j_len);
3292 }
3293
3294 if (buffer_journal_dirty(bh)) {
3295 count_already_incd = 1;
3296 PROC_INFO_INC(sb, journal.mark_dirty_notjournal);
3297 clear_buffer_journal_dirty(bh);
3298 }
3299
3300 if (journal->j_len > journal->j_len_alloc) {
3301 journal->j_len_alloc = journal->j_len + JOURNAL_PER_BALANCE_CNT;
3302 }
3303
3304 set_buffer_journaled(bh);
3305
3306 /* now put this guy on the end */
3307 if (!cn) {
3308 cn = get_cnode(sb);
3309 if (!cn) {
3310 reiserfs_panic(sb, "journal-4", "get_cnode failed!");
3311 }
3312
3313 if (th->t_blocks_logged == th->t_blocks_allocated) {
3314 th->t_blocks_allocated += JOURNAL_PER_BALANCE_CNT;
3315 journal->j_len_alloc += JOURNAL_PER_BALANCE_CNT;
3316 }
3317 th->t_blocks_logged++;
3318 journal->j_len++;
3319
3320 cn->bh = bh;
3321 cn->blocknr = bh->b_blocknr;
3322 cn->sb = sb;
3323 cn->jlist = NULL;
3324 insert_journal_hash(journal->j_hash_table, cn);
3325 if (!count_already_incd) {
3326 get_bh(bh);
3327 }
3328 }
3329 cn->next = NULL;
3330 cn->prev = journal->j_last;
3331 cn->bh = bh;
3332 if (journal->j_last) {
3333 journal->j_last->next = cn;
3334 journal->j_last = cn;
3335 } else {
3336 journal->j_first = cn;
3337 journal->j_last = cn;
3338 }
3339 return 0;
3340}
3341
3342int journal_end(struct reiserfs_transaction_handle *th,
3343 struct super_block *sb, unsigned long nblocks)
3344{
3345 if (!current->journal_info && th->t_refcount > 1)
3346 reiserfs_warning(sb, "REISER-NESTING",
3347 "th NULL, refcount %d", th->t_refcount);
3348
3349 if (!th->t_trans_id) {
3350 WARN_ON(1);
3351 return -EIO;
3352 }
3353
3354 th->t_refcount--;
3355 if (th->t_refcount > 0) {
3356 struct reiserfs_transaction_handle *cur_th =
3357 current->journal_info;
3358
3359 /* we aren't allowed to close a nested transaction on a different
3360 ** filesystem from the one in the task struct
3361 */
3362 BUG_ON(cur_th->t_super != th->t_super);
3363
3364 if (th != cur_th) {
3365 memcpy(current->journal_info, th, sizeof(*th));
3366 th->t_trans_id = 0;
3367 }
3368 return 0;
3369 } else {
3370 return do_journal_end(th, sb, nblocks, 0);
3371 }
3372}
3373
3374/* removes from the current transaction, relsing and descrementing any counters.
3375** also files the removed buffer directly onto the clean list
3376**
3377** called by journal_mark_freed when a block has been deleted
3378**
3379** returns 1 if it cleaned and relsed the buffer. 0 otherwise
3380*/
3381static int remove_from_transaction(struct super_block *sb,
3382 b_blocknr_t blocknr, int already_cleaned)
3383{
3384 struct buffer_head *bh;
3385 struct reiserfs_journal_cnode *cn;
3386 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3387 int ret = 0;
3388
3389 cn = get_journal_hash_dev(sb, journal->j_hash_table, blocknr);
3390 if (!cn || !cn->bh) {
3391 return ret;
3392 }
3393 bh = cn->bh;
3394 if (cn->prev) {
3395 cn->prev->next = cn->next;
3396 }
3397 if (cn->next) {
3398 cn->next->prev = cn->prev;
3399 }
3400 if (cn == journal->j_first) {
3401 journal->j_first = cn->next;
3402 }
3403 if (cn == journal->j_last) {
3404 journal->j_last = cn->prev;
3405 }
3406 if (bh)
3407 remove_journal_hash(sb, journal->j_hash_table, NULL,
3408 bh->b_blocknr, 0);
3409 clear_buffer_journaled(bh); /* don't log this one */
3410
3411 if (!already_cleaned) {
3412 clear_buffer_journal_dirty(bh);
3413 clear_buffer_dirty(bh);
3414 clear_buffer_journal_test(bh);
3415 put_bh(bh);
3416 if (atomic_read(&(bh->b_count)) < 0) {
3417 reiserfs_warning(sb, "journal-1752",
3418 "b_count < 0");
3419 }
3420 ret = 1;
3421 }
3422 journal->j_len--;
3423 journal->j_len_alloc--;
3424 free_cnode(sb, cn);
3425 return ret;
3426}
3427
3428/*
3429** for any cnode in a journal list, it can only be dirtied of all the
3430** transactions that include it are committed to disk.
3431** this checks through each transaction, and returns 1 if you are allowed to dirty,
3432** and 0 if you aren't
3433**
3434** it is called by dirty_journal_list, which is called after flush_commit_list has gotten all the log
3435** blocks for a given transaction on disk
3436**
3437*/
3438static int can_dirty(struct reiserfs_journal_cnode *cn)
3439{
3440 struct super_block *sb = cn->sb;
3441 b_blocknr_t blocknr = cn->blocknr;
3442 struct reiserfs_journal_cnode *cur = cn->hprev;
3443 int can_dirty = 1;
3444
3445 /* first test hprev. These are all newer than cn, so any node here
3446 ** with the same block number and dev means this node can't be sent
3447 ** to disk right now.
3448 */
3449 while (cur && can_dirty) {
3450 if (cur->jlist && cur->bh && cur->blocknr && cur->sb == sb &&
3451 cur->blocknr == blocknr) {
3452 can_dirty = 0;
3453 }
3454 cur = cur->hprev;
3455 }
3456 /* then test hnext. These are all older than cn. As long as they
3457 ** are committed to the log, it is safe to write cn to disk
3458 */
3459 cur = cn->hnext;
3460 while (cur && can_dirty) {
3461 if (cur->jlist && cur->jlist->j_len > 0 &&
3462 atomic_read(&(cur->jlist->j_commit_left)) > 0 && cur->bh &&
3463 cur->blocknr && cur->sb == sb && cur->blocknr == blocknr) {
3464 can_dirty = 0;
3465 }
3466 cur = cur->hnext;
3467 }
3468 return can_dirty;
3469}
3470
3471/* syncs the commit blocks, but does not force the real buffers to disk
3472** will wait until the current transaction is done/committed before returning
3473*/
3474int journal_end_sync(struct reiserfs_transaction_handle *th,
3475 struct super_block *sb, unsigned long nblocks)
3476{
3477 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3478
3479 BUG_ON(!th->t_trans_id);
3480 /* you can sync while nested, very, very bad */
3481 BUG_ON(th->t_refcount > 1);
3482 if (journal->j_len == 0) {
3483 reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
3484 1);
3485 journal_mark_dirty(th, sb, SB_BUFFER_WITH_SB(sb));
3486 }
3487 return do_journal_end(th, sb, nblocks, COMMIT_NOW | WAIT);
3488}
3489
3490/*
3491** writeback the pending async commits to disk
3492*/
3493static void flush_async_commits(struct work_struct *work)
3494{
3495 struct reiserfs_journal *journal =
3496 container_of(work, struct reiserfs_journal, j_work.work);
3497 struct super_block *sb = journal->j_work_sb;
3498 struct reiserfs_journal_list *jl;
3499 struct list_head *entry;
3500
3501 reiserfs_write_lock(sb);
3502 if (!list_empty(&journal->j_journal_list)) {
3503 /* last entry is the youngest, commit it and you get everything */
3504 entry = journal->j_journal_list.prev;
3505 jl = JOURNAL_LIST_ENTRY(entry);
3506 flush_commit_list(sb, jl, 1);
3507 }
3508 reiserfs_write_unlock(sb);
3509}
3510
3511/*
3512** flushes any old transactions to disk
3513** ends the current transaction if it is too old
3514*/
3515int reiserfs_flush_old_commits(struct super_block *sb)
3516{
3517 time_t now;
3518 struct reiserfs_transaction_handle th;
3519 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3520
3521 now = get_seconds();
3522 /* safety check so we don't flush while we are replaying the log during
3523 * mount
3524 */
3525 if (list_empty(&journal->j_journal_list)) {
3526 return 0;
3527 }
3528
3529 /* check the current transaction. If there are no writers, and it is
3530 * too old, finish it, and force the commit blocks to disk
3531 */
3532 if (atomic_read(&journal->j_wcount) <= 0 &&
3533 journal->j_trans_start_time > 0 &&
3534 journal->j_len > 0 &&
3535 (now - journal->j_trans_start_time) > journal->j_max_trans_age) {
3536 if (!journal_join(&th, sb, 1)) {
3537 reiserfs_prepare_for_journal(sb,
3538 SB_BUFFER_WITH_SB(sb),
3539 1);
3540 journal_mark_dirty(&th, sb,
3541 SB_BUFFER_WITH_SB(sb));
3542
3543 /* we're only being called from kreiserfsd, it makes no sense to do
3544 ** an async commit so that kreiserfsd can do it later
3545 */
3546 do_journal_end(&th, sb, 1, COMMIT_NOW | WAIT);
3547 }
3548 }
3549 return sb->s_dirt;
3550}
3551
3552/*
3553** returns 0 if do_journal_end should return right away, returns 1 if do_journal_end should finish the commit
3554**
3555** if the current transaction is too old, but still has writers, this will wait on j_join_wait until all
3556** the writers are done. By the time it wakes up, the transaction it was called has already ended, so it just
3557** flushes the commit list and returns 0.
3558**
3559** Won't batch when flush or commit_now is set. Also won't batch when others are waiting on j_join_wait.
3560**
3561** Note, we can't allow the journal_end to proceed while there are still writers in the log.
3562*/
3563static int check_journal_end(struct reiserfs_transaction_handle *th,
3564 struct super_block *sb, unsigned long nblocks,
3565 int flags)
3566{
3567
3568 time_t now;
3569 int flush = flags & FLUSH_ALL;
3570 int commit_now = flags & COMMIT_NOW;
3571 int wait_on_commit = flags & WAIT;
3572 struct reiserfs_journal_list *jl;
3573 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3574
3575 BUG_ON(!th->t_trans_id);
3576
3577 if (th->t_trans_id != journal->j_trans_id) {
3578 reiserfs_panic(th->t_super, "journal-1577",
3579 "handle trans id %ld != current trans id %ld",
3580 th->t_trans_id, journal->j_trans_id);
3581 }
3582
3583 journal->j_len_alloc -= (th->t_blocks_allocated - th->t_blocks_logged);
3584 if (atomic_read(&(journal->j_wcount)) > 0) { /* <= 0 is allowed. unmounting might not call begin */
3585 atomic_dec(&(journal->j_wcount));
3586 }
3587
3588 /* BUG, deal with case where j_len is 0, but people previously freed blocks need to be released
3589 ** will be dealt with by next transaction that actually writes something, but should be taken
3590 ** care of in this trans
3591 */
3592 BUG_ON(journal->j_len == 0);
3593
3594 /* if wcount > 0, and we are called to with flush or commit_now,
3595 ** we wait on j_join_wait. We will wake up when the last writer has
3596 ** finished the transaction, and started it on its way to the disk.
3597 ** Then, we flush the commit or journal list, and just return 0
3598 ** because the rest of journal end was already done for this transaction.
3599 */
3600 if (atomic_read(&(journal->j_wcount)) > 0) {
3601 if (flush || commit_now) {
3602 unsigned trans_id;
3603
3604 jl = journal->j_current_jl;
3605 trans_id = jl->j_trans_id;
3606 if (wait_on_commit)
3607 jl->j_state |= LIST_COMMIT_PENDING;
3608 atomic_set(&(journal->j_jlock), 1);
3609 if (flush) {
3610 journal->j_next_full_flush = 1;
3611 }
3612 unlock_journal(sb);
3613
3614 /* sleep while the current transaction is still j_jlocked */
3615 while (journal->j_trans_id == trans_id) {
3616 if (atomic_read(&journal->j_jlock)) {
3617 queue_log_writer(sb);
3618 } else {
3619 lock_journal(sb);
3620 if (journal->j_trans_id == trans_id) {
3621 atomic_set(&(journal->j_jlock),
3622 1);
3623 }
3624 unlock_journal(sb);
3625 }
3626 }
3627 BUG_ON(journal->j_trans_id == trans_id);
3628
3629 if (commit_now
3630 && journal_list_still_alive(sb, trans_id)
3631 && wait_on_commit) {
3632 flush_commit_list(sb, jl, 1);
3633 }
3634 return 0;
3635 }
3636 unlock_journal(sb);
3637 return 0;
3638 }
3639
3640 /* deal with old transactions where we are the last writers */
3641 now = get_seconds();
3642 if ((now - journal->j_trans_start_time) > journal->j_max_trans_age) {
3643 commit_now = 1;
3644 journal->j_next_async_flush = 1;
3645 }
3646 /* don't batch when someone is waiting on j_join_wait */
3647 /* don't batch when syncing the commit or flushing the whole trans */
3648 if (!(journal->j_must_wait > 0) && !(atomic_read(&(journal->j_jlock)))
3649 && !flush && !commit_now && (journal->j_len < journal->j_max_batch)
3650 && journal->j_len_alloc < journal->j_max_batch
3651 && journal->j_cnode_free > (journal->j_trans_max * 3)) {
3652 journal->j_bcount++;
3653 unlock_journal(sb);
3654 return 0;
3655 }
3656
3657 if (journal->j_start > SB_ONDISK_JOURNAL_SIZE(sb)) {
3658 reiserfs_panic(sb, "journal-003",
3659 "j_start (%ld) is too high",
3660 journal->j_start);
3661 }
3662 return 1;
3663}
3664
3665/*
3666** Does all the work that makes deleting blocks safe.
3667** when deleting a block mark BH_JNew, just remove it from the current transaction, clean it's buffer_head and move on.
3668**
3669** otherwise:
3670** set a bit for the block in the journal bitmap. That will prevent it from being allocated for unformatted nodes
3671** before this transaction has finished.
3672**
3673** mark any cnodes for this block as BLOCK_FREED, and clear their bh pointers. That will prevent any old transactions with
3674** this block from trying to flush to the real location. Since we aren't removing the cnode from the journal_list_hash,
3675** the block can't be reallocated yet.
3676**
3677** Then remove it from the current transaction, decrementing any counters and filing it on the clean list.
3678*/
3679int journal_mark_freed(struct reiserfs_transaction_handle *th,
3680 struct super_block *sb, b_blocknr_t blocknr)
3681{
3682 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3683 struct reiserfs_journal_cnode *cn = NULL;
3684 struct buffer_head *bh = NULL;
3685 struct reiserfs_list_bitmap *jb = NULL;
3686 int cleaned = 0;
3687 BUG_ON(!th->t_trans_id);
3688
3689 cn = get_journal_hash_dev(sb, journal->j_hash_table, blocknr);
3690 if (cn && cn->bh) {
3691 bh = cn->bh;
3692 get_bh(bh);
3693 }
3694 /* if it is journal new, we just remove it from this transaction */
3695 if (bh && buffer_journal_new(bh)) {
3696 clear_buffer_journal_new(bh);
3697 clear_prepared_bits(bh);
3698 reiserfs_clean_and_file_buffer(bh);
3699 cleaned = remove_from_transaction(sb, blocknr, cleaned);
3700 } else {
3701 /* set the bit for this block in the journal bitmap for this transaction */
3702 jb = journal->j_current_jl->j_list_bitmap;
3703 if (!jb) {
3704 reiserfs_panic(sb, "journal-1702",
3705 "journal_list_bitmap is NULL");
3706 }
3707 set_bit_in_list_bitmap(sb, blocknr, jb);
3708
3709 /* Note, the entire while loop is not allowed to schedule. */
3710
3711 if (bh) {
3712 clear_prepared_bits(bh);
3713 reiserfs_clean_and_file_buffer(bh);
3714 }
3715 cleaned = remove_from_transaction(sb, blocknr, cleaned);
3716
3717 /* find all older transactions with this block, make sure they don't try to write it out */
3718 cn = get_journal_hash_dev(sb, journal->j_list_hash_table,
3719 blocknr);
3720 while (cn) {
3721 if (sb == cn->sb && blocknr == cn->blocknr) {
3722 set_bit(BLOCK_FREED, &cn->state);
3723 if (cn->bh) {
3724 if (!cleaned) {
3725 /* remove_from_transaction will brelse the buffer if it was
3726 ** in the current trans
3727 */
3728 clear_buffer_journal_dirty(cn->
3729 bh);
3730 clear_buffer_dirty(cn->bh);
3731 clear_buffer_journal_test(cn->
3732 bh);
3733 cleaned = 1;
3734 put_bh(cn->bh);
3735 if (atomic_read
3736 (&(cn->bh->b_count)) < 0) {
3737 reiserfs_warning(sb,
3738 "journal-2138",
3739 "cn->bh->b_count < 0");
3740 }
3741 }
3742 if (cn->jlist) { /* since we are clearing the bh, we MUST dec nonzerolen */
3743 atomic_dec(&
3744 (cn->jlist->
3745 j_nonzerolen));
3746 }
3747 cn->bh = NULL;
3748 }
3749 }
3750 cn = cn->hnext;
3751 }
3752 }
3753
3754 if (bh)
3755 release_buffer_page(bh); /* get_hash grabs the buffer */
3756 return 0;
3757}
3758
3759void reiserfs_update_inode_transaction(struct inode *inode)
3760{
3761 struct reiserfs_journal *journal = SB_JOURNAL(inode->i_sb);
3762 REISERFS_I(inode)->i_jl = journal->j_current_jl;
3763 REISERFS_I(inode)->i_trans_id = journal->j_trans_id;
3764}
3765
3766/*
3767 * returns -1 on error, 0 if no commits/barriers were done and 1
3768 * if a transaction was actually committed and the barrier was done
3769 */
3770static int __commit_trans_jl(struct inode *inode, unsigned long id,
3771 struct reiserfs_journal_list *jl)
3772{
3773 struct reiserfs_transaction_handle th;
3774 struct super_block *sb = inode->i_sb;
3775 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3776 int ret = 0;
3777
3778 /* is it from the current transaction, or from an unknown transaction? */
3779 if (id == journal->j_trans_id) {
3780 jl = journal->j_current_jl;
3781 /* try to let other writers come in and grow this transaction */
3782 let_transaction_grow(sb, id);
3783 if (journal->j_trans_id != id) {
3784 goto flush_commit_only;
3785 }
3786
3787 ret = journal_begin(&th, sb, 1);
3788 if (ret)
3789 return ret;
3790
3791 /* someone might have ended this transaction while we joined */
3792 if (journal->j_trans_id != id) {
3793 reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
3794 1);
3795 journal_mark_dirty(&th, sb, SB_BUFFER_WITH_SB(sb));
3796 ret = journal_end(&th, sb, 1);
3797 goto flush_commit_only;
3798 }
3799
3800 ret = journal_end_sync(&th, sb, 1);
3801 if (!ret)
3802 ret = 1;
3803
3804 } else {
3805 /* this gets tricky, we have to make sure the journal list in
3806 * the inode still exists. We know the list is still around
3807 * if we've got a larger transaction id than the oldest list
3808 */
3809 flush_commit_only:
3810 if (journal_list_still_alive(inode->i_sb, id)) {
3811 /*
3812 * we only set ret to 1 when we know for sure
3813 * the barrier hasn't been started yet on the commit
3814 * block.
3815 */
3816 if (atomic_read(&jl->j_commit_left) > 1)
3817 ret = 1;
3818 flush_commit_list(sb, jl, 1);
3819 if (journal->j_errno)
3820 ret = journal->j_errno;
3821 }
3822 }
3823 /* otherwise the list is gone, and long since committed */
3824 return ret;
3825}
3826
3827int reiserfs_commit_for_inode(struct inode *inode)
3828{
3829 unsigned int id = REISERFS_I(inode)->i_trans_id;
3830 struct reiserfs_journal_list *jl = REISERFS_I(inode)->i_jl;
3831
3832 /* for the whole inode, assume unset id means it was
3833 * changed in the current transaction. More conservative
3834 */
3835 if (!id || !jl) {
3836 reiserfs_update_inode_transaction(inode);
3837 id = REISERFS_I(inode)->i_trans_id;
3838 /* jl will be updated in __commit_trans_jl */
3839 }
3840
3841 return __commit_trans_jl(inode, id, jl);
3842}
3843
3844void reiserfs_restore_prepared_buffer(struct super_block *sb,
3845 struct buffer_head *bh)
3846{
3847 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3848 PROC_INFO_INC(sb, journal.restore_prepared);
3849 if (!bh) {
3850 return;
3851 }
3852 if (test_clear_buffer_journal_restore_dirty(bh) &&
3853 buffer_journal_dirty(bh)) {
3854 struct reiserfs_journal_cnode *cn;
3855 cn = get_journal_hash_dev(sb,
3856 journal->j_list_hash_table,
3857 bh->b_blocknr);
3858 if (cn && can_dirty(cn)) {
3859 set_buffer_journal_test(bh);
3860 mark_buffer_dirty(bh);
3861 }
3862 }
3863 clear_buffer_journal_prepared(bh);
3864}
3865
3866extern struct tree_balance *cur_tb;
3867/*
3868** before we can change a metadata block, we have to make sure it won't
3869** be written to disk while we are altering it. So, we must:
3870** clean it
3871** wait on it.
3872**
3873*/
3874int reiserfs_prepare_for_journal(struct super_block *sb,
3875 struct buffer_head *bh, int wait)
3876{
3877 PROC_INFO_INC(sb, journal.prepare);
3878
3879 if (!trylock_buffer(bh)) {
3880 if (!wait)
3881 return 0;
3882 lock_buffer(bh);
3883 }
3884 set_buffer_journal_prepared(bh);
3885 if (test_clear_buffer_dirty(bh) && buffer_journal_dirty(bh)) {
3886 clear_buffer_journal_test(bh);
3887 set_buffer_journal_restore_dirty(bh);
3888 }
3889 unlock_buffer(bh);
3890 return 1;
3891}
3892
3893static void flush_old_journal_lists(struct super_block *s)
3894{
3895 struct reiserfs_journal *journal = SB_JOURNAL(s);
3896 struct reiserfs_journal_list *jl;
3897 struct list_head *entry;
3898 time_t now = get_seconds();
3899
3900 while (!list_empty(&journal->j_journal_list)) {
3901 entry = journal->j_journal_list.next;
3902 jl = JOURNAL_LIST_ENTRY(entry);
3903 /* this check should always be run, to send old lists to disk */
3904 if (jl->j_timestamp < (now - (JOURNAL_MAX_TRANS_AGE * 4)) &&
3905 atomic_read(&jl->j_commit_left) == 0 &&
3906 test_transaction(s, jl)) {
3907 flush_used_journal_lists(s, jl);
3908 } else {
3909 break;
3910 }
3911 }
3912}
3913
3914/*
3915** long and ugly. If flush, will not return until all commit
3916** blocks and all real buffers in the trans are on disk.
3917** If no_async, won't return until all commit blocks are on disk.
3918**
3919** keep reading, there are comments as you go along
3920**
3921** If the journal is aborted, we just clean up. Things like flushing
3922** journal lists, etc just won't happen.
3923*/
3924static int do_journal_end(struct reiserfs_transaction_handle *th,
3925 struct super_block *sb, unsigned long nblocks,
3926 int flags)
3927{
3928 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3929 struct reiserfs_journal_cnode *cn, *next, *jl_cn;
3930 struct reiserfs_journal_cnode *last_cn = NULL;
3931 struct reiserfs_journal_desc *desc;
3932 struct reiserfs_journal_commit *commit;
3933 struct buffer_head *c_bh; /* commit bh */
3934 struct buffer_head *d_bh; /* desc bh */
3935 int cur_write_start = 0; /* start index of current log write */
3936 int old_start;
3937 int i;
3938 int flush;
3939 int wait_on_commit;
3940 struct reiserfs_journal_list *jl, *temp_jl;
3941 struct list_head *entry, *safe;
3942 unsigned long jindex;
3943 unsigned int commit_trans_id;
3944 int trans_half;
3945
3946 BUG_ON(th->t_refcount > 1);
3947 BUG_ON(!th->t_trans_id);
3948
3949 /* protect flush_older_commits from doing mistakes if the
3950 transaction ID counter gets overflowed. */
3951 if (th->t_trans_id == ~0U)
3952 flags |= FLUSH_ALL | COMMIT_NOW | WAIT;
3953 flush = flags & FLUSH_ALL;
3954 wait_on_commit = flags & WAIT;
3955
3956 current->journal_info = th->t_handle_save;
3957 reiserfs_check_lock_depth(sb, "journal end");
3958 if (journal->j_len == 0) {
3959 reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
3960 1);
3961 journal_mark_dirty(th, sb, SB_BUFFER_WITH_SB(sb));
3962 }
3963
3964 lock_journal(sb);
3965 if (journal->j_next_full_flush) {
3966 flags |= FLUSH_ALL;
3967 flush = 1;
3968 }
3969 if (journal->j_next_async_flush) {
3970 flags |= COMMIT_NOW | WAIT;
3971 wait_on_commit = 1;
3972 }
3973
3974 /* check_journal_end locks the journal, and unlocks if it does not return 1
3975 ** it tells us if we should continue with the journal_end, or just return
3976 */
3977 if (!check_journal_end(th, sb, nblocks, flags)) {
3978 sb->s_dirt = 1;
3979 wake_queued_writers(sb);
3980 reiserfs_async_progress_wait(sb);
3981 goto out;
3982 }
3983
3984 /* check_journal_end might set these, check again */
3985 if (journal->j_next_full_flush) {
3986 flush = 1;
3987 }
3988
3989 /*
3990 ** j must wait means we have to flush the log blocks, and the real blocks for
3991 ** this transaction
3992 */
3993 if (journal->j_must_wait > 0) {
3994 flush = 1;
3995 }
3996#ifdef REISERFS_PREALLOCATE
3997 /* quota ops might need to nest, setup the journal_info pointer for them
3998 * and raise the refcount so that it is > 0. */
3999 current->journal_info = th;
4000 th->t_refcount++;
4001 reiserfs_discard_all_prealloc(th); /* it should not involve new blocks into
4002 * the transaction */
4003 th->t_refcount--;
4004 current->journal_info = th->t_handle_save;
4005#endif
4006
4007 /* setup description block */
4008 d_bh =
4009 journal_getblk(sb,
4010 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
4011 journal->j_start);
4012 set_buffer_uptodate(d_bh);
4013 desc = (struct reiserfs_journal_desc *)(d_bh)->b_data;
4014 memset(d_bh->b_data, 0, d_bh->b_size);
4015 memcpy(get_journal_desc_magic(d_bh), JOURNAL_DESC_MAGIC, 8);
4016 set_desc_trans_id(desc, journal->j_trans_id);
4017
4018 /* setup commit block. Don't write (keep it clean too) this one until after everyone else is written */
4019 c_bh = journal_getblk(sb, SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
4020 ((journal->j_start + journal->j_len +
4021 1) % SB_ONDISK_JOURNAL_SIZE(sb)));
4022 commit = (struct reiserfs_journal_commit *)c_bh->b_data;
4023 memset(c_bh->b_data, 0, c_bh->b_size);
4024 set_commit_trans_id(commit, journal->j_trans_id);
4025 set_buffer_uptodate(c_bh);
4026
4027 /* init this journal list */
4028 jl = journal->j_current_jl;
4029
4030 /* we lock the commit before doing anything because
4031 * we want to make sure nobody tries to run flush_commit_list until
4032 * the new transaction is fully setup, and we've already flushed the
4033 * ordered bh list
4034 */
4035 reiserfs_mutex_lock_safe(&jl->j_commit_mutex, sb);
4036
4037 /* save the transaction id in case we need to commit it later */
4038 commit_trans_id = jl->j_trans_id;
4039
4040 atomic_set(&jl->j_older_commits_done, 0);
4041 jl->j_trans_id = journal->j_trans_id;
4042 jl->j_timestamp = journal->j_trans_start_time;
4043 jl->j_commit_bh = c_bh;
4044 jl->j_start = journal->j_start;
4045 jl->j_len = journal->j_len;
4046 atomic_set(&jl->j_nonzerolen, journal->j_len);
4047 atomic_set(&jl->j_commit_left, journal->j_len + 2);
4048 jl->j_realblock = NULL;
4049
4050 /* The ENTIRE FOR LOOP MUST not cause schedule to occur.
4051 ** for each real block, add it to the journal list hash,
4052 ** copy into real block index array in the commit or desc block
4053 */
4054 trans_half = journal_trans_half(sb->s_blocksize);
4055 for (i = 0, cn = journal->j_first; cn; cn = cn->next, i++) {
4056 if (buffer_journaled(cn->bh)) {
4057 jl_cn = get_cnode(sb);
4058 if (!jl_cn) {
4059 reiserfs_panic(sb, "journal-1676",
4060 "get_cnode returned NULL");
4061 }
4062 if (i == 0) {
4063 jl->j_realblock = jl_cn;
4064 }
4065 jl_cn->prev = last_cn;
4066 jl_cn->next = NULL;
4067 if (last_cn) {
4068 last_cn->next = jl_cn;
4069 }
4070 last_cn = jl_cn;
4071 /* make sure the block we are trying to log is not a block
4072 of journal or reserved area */
4073
4074 if (is_block_in_log_or_reserved_area
4075 (sb, cn->bh->b_blocknr)) {
4076 reiserfs_panic(sb, "journal-2332",
4077 "Trying to log block %lu, "
4078 "which is a log block",
4079 cn->bh->b_blocknr);
4080 }
4081 jl_cn->blocknr = cn->bh->b_blocknr;
4082 jl_cn->state = 0;
4083 jl_cn->sb = sb;
4084 jl_cn->bh = cn->bh;
4085 jl_cn->jlist = jl;
4086 insert_journal_hash(journal->j_list_hash_table, jl_cn);
4087 if (i < trans_half) {
4088 desc->j_realblock[i] =
4089 cpu_to_le32(cn->bh->b_blocknr);
4090 } else {
4091 commit->j_realblock[i - trans_half] =
4092 cpu_to_le32(cn->bh->b_blocknr);
4093 }
4094 } else {
4095 i--;
4096 }
4097 }
4098 set_desc_trans_len(desc, journal->j_len);
4099 set_desc_mount_id(desc, journal->j_mount_id);
4100 set_desc_trans_id(desc, journal->j_trans_id);
4101 set_commit_trans_len(commit, journal->j_len);
4102
4103 /* special check in case all buffers in the journal were marked for not logging */
4104 BUG_ON(journal->j_len == 0);
4105
4106 /* we're about to dirty all the log blocks, mark the description block
4107 * dirty now too. Don't mark the commit block dirty until all the
4108 * others are on disk
4109 */
4110 mark_buffer_dirty(d_bh);
4111
4112 /* first data block is j_start + 1, so add one to cur_write_start wherever you use it */
4113 cur_write_start = journal->j_start;
4114 cn = journal->j_first;
4115 jindex = 1; /* start at one so we don't get the desc again */
4116 while (cn) {
4117 clear_buffer_journal_new(cn->bh);
4118 /* copy all the real blocks into log area. dirty log blocks */
4119 if (buffer_journaled(cn->bh)) {
4120 struct buffer_head *tmp_bh;
4121 char *addr;
4122 struct page *page;
4123 tmp_bh =
4124 journal_getblk(sb,
4125 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
4126 ((cur_write_start +
4127 jindex) %
4128 SB_ONDISK_JOURNAL_SIZE(sb)));
4129 set_buffer_uptodate(tmp_bh);
4130 page = cn->bh->b_page;
4131 addr = kmap(page);
4132 memcpy(tmp_bh->b_data,
4133 addr + offset_in_page(cn->bh->b_data),
4134 cn->bh->b_size);
4135 kunmap(page);
4136 mark_buffer_dirty(tmp_bh);
4137 jindex++;
4138 set_buffer_journal_dirty(cn->bh);
4139 clear_buffer_journaled(cn->bh);
4140 } else {
4141 /* JDirty cleared sometime during transaction. don't log this one */
4142 reiserfs_warning(sb, "journal-2048",
4143 "BAD, buffer in journal hash, "
4144 "but not JDirty!");
4145 brelse(cn->bh);
4146 }
4147 next = cn->next;
4148 free_cnode(sb, cn);
4149 cn = next;
4150 reiserfs_write_unlock(sb);
4151 cond_resched();
4152 reiserfs_write_lock(sb);
4153 }
4154
4155 /* we are done with both the c_bh and d_bh, but
4156 ** c_bh must be written after all other commit blocks,
4157 ** so we dirty/relse c_bh in flush_commit_list, with commit_left <= 1.
4158 */
4159
4160 journal->j_current_jl = alloc_journal_list(sb);
4161
4162 /* now it is safe to insert this transaction on the main list */
4163 list_add_tail(&jl->j_list, &journal->j_journal_list);
4164 list_add_tail(&jl->j_working_list, &journal->j_working_list);
4165 journal->j_num_work_lists++;
4166
4167 /* reset journal values for the next transaction */
4168 old_start = journal->j_start;
4169 journal->j_start =
4170 (journal->j_start + journal->j_len +
4171 2) % SB_ONDISK_JOURNAL_SIZE(sb);
4172 atomic_set(&(journal->j_wcount), 0);
4173 journal->j_bcount = 0;
4174 journal->j_last = NULL;
4175 journal->j_first = NULL;
4176 journal->j_len = 0;
4177 journal->j_trans_start_time = 0;
4178 /* check for trans_id overflow */
4179 if (++journal->j_trans_id == 0)
4180 journal->j_trans_id = 10;
4181 journal->j_current_jl->j_trans_id = journal->j_trans_id;
4182 journal->j_must_wait = 0;
4183 journal->j_len_alloc = 0;
4184 journal->j_next_full_flush = 0;
4185 journal->j_next_async_flush = 0;
4186 init_journal_hash(sb);
4187
4188 // make sure reiserfs_add_jh sees the new current_jl before we
4189 // write out the tails
4190 smp_mb();
4191
4192 /* tail conversion targets have to hit the disk before we end the
4193 * transaction. Otherwise a later transaction might repack the tail
4194 * before this transaction commits, leaving the data block unflushed and
4195 * clean, if we crash before the later transaction commits, the data block
4196 * is lost.
4197 */
4198 if (!list_empty(&jl->j_tail_bh_list)) {
4199 reiserfs_write_unlock(sb);
4200 write_ordered_buffers(&journal->j_dirty_buffers_lock,
4201 journal, jl, &jl->j_tail_bh_list);
4202 reiserfs_write_lock(sb);
4203 }
4204 BUG_ON(!list_empty(&jl->j_tail_bh_list));
4205 mutex_unlock(&jl->j_commit_mutex);
4206
4207 /* honor the flush wishes from the caller, simple commits can
4208 ** be done outside the journal lock, they are done below
4209 **
4210 ** if we don't flush the commit list right now, we put it into
4211 ** the work queue so the people waiting on the async progress work
4212 ** queue don't wait for this proc to flush journal lists and such.
4213 */
4214 if (flush) {
4215 flush_commit_list(sb, jl, 1);
4216 flush_journal_list(sb, jl, 1);
4217 } else if (!(jl->j_state & LIST_COMMIT_PENDING))
4218 queue_delayed_work(commit_wq, &journal->j_work, HZ / 10);
4219
4220 /* if the next transaction has any chance of wrapping, flush
4221 ** transactions that might get overwritten. If any journal lists are very
4222 ** old flush them as well.
4223 */
4224 first_jl:
4225 list_for_each_safe(entry, safe, &journal->j_journal_list) {
4226 temp_jl = JOURNAL_LIST_ENTRY(entry);
4227 if (journal->j_start <= temp_jl->j_start) {
4228 if ((journal->j_start + journal->j_trans_max + 1) >=
4229 temp_jl->j_start) {
4230 flush_used_journal_lists(sb, temp_jl);
4231 goto first_jl;
4232 } else if ((journal->j_start +
4233 journal->j_trans_max + 1) <
4234 SB_ONDISK_JOURNAL_SIZE(sb)) {
4235 /* if we don't cross into the next transaction and we don't
4236 * wrap, there is no way we can overlap any later transactions
4237 * break now
4238 */
4239 break;
4240 }
4241 } else if ((journal->j_start +
4242 journal->j_trans_max + 1) >
4243 SB_ONDISK_JOURNAL_SIZE(sb)) {
4244 if (((journal->j_start + journal->j_trans_max + 1) %
4245 SB_ONDISK_JOURNAL_SIZE(sb)) >=
4246 temp_jl->j_start) {
4247 flush_used_journal_lists(sb, temp_jl);
4248 goto first_jl;
4249 } else {
4250 /* we don't overlap anything from out start to the end of the
4251 * log, and our wrapped portion doesn't overlap anything at
4252 * the start of the log. We can break
4253 */
4254 break;
4255 }
4256 }
4257 }
4258 flush_old_journal_lists(sb);
4259
4260 journal->j_current_jl->j_list_bitmap =
4261 get_list_bitmap(sb, journal->j_current_jl);
4262
4263 if (!(journal->j_current_jl->j_list_bitmap)) {
4264 reiserfs_panic(sb, "journal-1996",
4265 "could not get a list bitmap");
4266 }
4267
4268 atomic_set(&(journal->j_jlock), 0);
4269 unlock_journal(sb);
4270 /* wake up any body waiting to join. */
4271 clear_bit(J_WRITERS_QUEUED, &journal->j_state);
4272 wake_up(&(journal->j_join_wait));
4273
4274 if (!flush && wait_on_commit &&
4275 journal_list_still_alive(sb, commit_trans_id)) {
4276 flush_commit_list(sb, jl, 1);
4277 }
4278 out:
4279 reiserfs_check_lock_depth(sb, "journal end2");
4280
4281 memset(th, 0, sizeof(*th));
4282 /* Re-set th->t_super, so we can properly keep track of how many
4283 * persistent transactions there are. We need to do this so if this
4284 * call is part of a failed restart_transaction, we can free it later */
4285 th->t_super = sb;
4286
4287 return journal->j_errno;
4288}
4289
4290/* Send the file system read only and refuse new transactions */
4291void reiserfs_abort_journal(struct super_block *sb, int errno)
4292{
4293 struct reiserfs_journal *journal = SB_JOURNAL(sb);
4294 if (test_bit(J_ABORTED, &journal->j_state))
4295 return;
4296
4297 if (!journal->j_errno)
4298 journal->j_errno = errno;
4299
4300 sb->s_flags |= MS_RDONLY;
4301 set_bit(J_ABORTED, &journal->j_state);
4302
4303#ifdef CONFIG_REISERFS_CHECK
4304 dump_stack();
4305#endif
4306}
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
87static int do_journal_end(struct reiserfs_transaction_handle *, int flags);
88static int flush_journal_list(struct super_block *s,
89 struct reiserfs_journal_list *jl, int flushall);
90static int flush_commit_list(struct super_block *s,
91 struct reiserfs_journal_list *jl, int flushall);
92static int can_dirty(struct reiserfs_journal_cnode *cn);
93static int journal_join(struct reiserfs_transaction_handle *th,
94 struct super_block *sb);
95static void release_journal_dev(struct super_block *super,
96 struct reiserfs_journal *journal);
97static void dirty_one_transaction(struct super_block *s,
98 struct reiserfs_journal_list *jl);
99static void flush_async_commits(struct work_struct *work);
100static void queue_log_writer(struct super_block *s);
101
102/* values for join in do_journal_begin_r */
103enum {
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
111static int do_journal_begin_r(struct reiserfs_transaction_handle *th,
112 struct super_block *sb,
113 unsigned long nblocks, int join);
114
115static 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 */
128static 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
137static 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
157static 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++;
164repeat:
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}
180static 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
194static 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
211static 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
225static 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 */
243static 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
258static 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 */
280int 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 */
311static 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 */
346static 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(array_size(num_cnodes,
354 sizeof(struct reiserfs_journal_cnode)));
355 if (!head) {
356 return NULL;
357 }
358 head[0].prev = NULL;
359 head[0].next = head + 1;
360 for (i = 1; i < num_cnodes; i++) {
361 head[i].prev = head + (i - 1);
362 head[i].next = head + (i + 1); /* if last one, overwrite it after the if */
363 }
364 head[num_cnodes - 1].next = NULL;
365 return head;
366}
367
368/* pulls a cnode off the free list, or returns NULL on failure */
369static struct reiserfs_journal_cnode *get_cnode(struct super_block *sb)
370{
371 struct reiserfs_journal_cnode *cn;
372 struct reiserfs_journal *journal = SB_JOURNAL(sb);
373
374 reiserfs_check_lock_depth(sb, "get_cnode");
375
376 if (journal->j_cnode_free <= 0) {
377 return NULL;
378 }
379 journal->j_cnode_used++;
380 journal->j_cnode_free--;
381 cn = journal->j_cnode_free_list;
382 if (!cn) {
383 return cn;
384 }
385 if (cn->next) {
386 cn->next->prev = NULL;
387 }
388 journal->j_cnode_free_list = cn->next;
389 memset(cn, 0, sizeof(struct reiserfs_journal_cnode));
390 return cn;
391}
392
393/*
394 * returns a cnode to the free list
395 */
396static void free_cnode(struct super_block *sb,
397 struct reiserfs_journal_cnode *cn)
398{
399 struct reiserfs_journal *journal = SB_JOURNAL(sb);
400
401 reiserfs_check_lock_depth(sb, "free_cnode");
402
403 journal->j_cnode_used--;
404 journal->j_cnode_free++;
405 /* memset(cn, 0, sizeof(struct reiserfs_journal_cnode)) ; */
406 cn->next = journal->j_cnode_free_list;
407 if (journal->j_cnode_free_list) {
408 journal->j_cnode_free_list->prev = cn;
409 }
410 cn->prev = NULL; /* not needed with the memset, but I might kill the memset, and forget to do this */
411 journal->j_cnode_free_list = cn;
412}
413
414static void clear_prepared_bits(struct buffer_head *bh)
415{
416 clear_buffer_journal_prepared(bh);
417 clear_buffer_journal_restore_dirty(bh);
418}
419
420/*
421 * return a cnode with same dev, block number and size in table,
422 * or null if not found
423 */
424static inline struct reiserfs_journal_cnode *get_journal_hash_dev(struct
425 super_block
426 *sb,
427 struct
428 reiserfs_journal_cnode
429 **table,
430 long bl)
431{
432 struct reiserfs_journal_cnode *cn;
433 cn = journal_hash(table, sb, bl);
434 while (cn) {
435 if (cn->blocknr == bl && cn->sb == sb)
436 return cn;
437 cn = cn->hnext;
438 }
439 return (struct reiserfs_journal_cnode *)0;
440}
441
442/*
443 * this actually means 'can this block be reallocated yet?'. If you set
444 * search_all, a block can only be allocated if it is not in the current
445 * transaction, was not freed by the current transaction, and has no chance
446 * of ever being overwritten by a replay after crashing.
447 *
448 * If you don't set search_all, a block can only be allocated if it is not
449 * in the current transaction. Since deleting a block removes it from the
450 * current transaction, this case should never happen. If you don't set
451 * search_all, make sure you never write the block without logging it.
452 *
453 * next_zero_bit is a suggestion about the next block to try for find_forward.
454 * when bl is rejected because it is set in a journal list bitmap, we search
455 * for the next zero bit in the bitmap that rejected bl. Then, we return
456 * that through next_zero_bit for find_forward to try.
457 *
458 * Just because we return something in next_zero_bit does not mean we won't
459 * reject it on the next call to reiserfs_in_journal
460 */
461int reiserfs_in_journal(struct super_block *sb,
462 unsigned int bmap_nr, int bit_nr, int search_all,
463 b_blocknr_t * next_zero_bit)
464{
465 struct reiserfs_journal *journal = SB_JOURNAL(sb);
466 struct reiserfs_journal_cnode *cn;
467 struct reiserfs_list_bitmap *jb;
468 int i;
469 unsigned long bl;
470
471 *next_zero_bit = 0; /* always start this at zero. */
472
473 PROC_INFO_INC(sb, journal.in_journal);
474 /*
475 * If we aren't doing a search_all, this is a metablock, and it
476 * will be logged before use. if we crash before the transaction
477 * that freed it commits, this transaction won't have committed
478 * either, and the block will never be written
479 */
480 if (search_all) {
481 for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
482 PROC_INFO_INC(sb, journal.in_journal_bitmap);
483 jb = journal->j_list_bitmap + i;
484 if (jb->journal_list && jb->bitmaps[bmap_nr] &&
485 test_bit(bit_nr,
486 (unsigned long *)jb->bitmaps[bmap_nr]->
487 data)) {
488 *next_zero_bit =
489 find_next_zero_bit((unsigned long *)
490 (jb->bitmaps[bmap_nr]->
491 data),
492 sb->s_blocksize << 3,
493 bit_nr + 1);
494 return 1;
495 }
496 }
497 }
498
499 bl = bmap_nr * (sb->s_blocksize << 3) + bit_nr;
500 /* is it in any old transactions? */
501 if (search_all
502 && (cn =
503 get_journal_hash_dev(sb, journal->j_list_hash_table, bl))) {
504 return 1;
505 }
506
507 /* is it in the current transaction. This should never happen */
508 if ((cn = get_journal_hash_dev(sb, journal->j_hash_table, bl))) {
509 BUG();
510 return 1;
511 }
512
513 PROC_INFO_INC(sb, journal.in_journal_reusable);
514 /* safe for reuse */
515 return 0;
516}
517
518/* insert cn into table */
519static inline void insert_journal_hash(struct reiserfs_journal_cnode **table,
520 struct reiserfs_journal_cnode *cn)
521{
522 struct reiserfs_journal_cnode *cn_orig;
523
524 cn_orig = journal_hash(table, cn->sb, cn->blocknr);
525 cn->hnext = cn_orig;
526 cn->hprev = NULL;
527 if (cn_orig) {
528 cn_orig->hprev = cn;
529 }
530 journal_hash(table, cn->sb, cn->blocknr) = cn;
531}
532
533/* lock the current transaction */
534static inline void lock_journal(struct super_block *sb)
535{
536 PROC_INFO_INC(sb, journal.lock_journal);
537
538 reiserfs_mutex_lock_safe(&SB_JOURNAL(sb)->j_mutex, sb);
539}
540
541/* unlock the current transaction */
542static inline void unlock_journal(struct super_block *sb)
543{
544 mutex_unlock(&SB_JOURNAL(sb)->j_mutex);
545}
546
547static inline void get_journal_list(struct reiserfs_journal_list *jl)
548{
549 jl->j_refcount++;
550}
551
552static inline void put_journal_list(struct super_block *s,
553 struct reiserfs_journal_list *jl)
554{
555 if (jl->j_refcount < 1) {
556 reiserfs_panic(s, "journal-2", "trans id %u, refcount at %d",
557 jl->j_trans_id, jl->j_refcount);
558 }
559 if (--jl->j_refcount == 0)
560 kfree(jl);
561}
562
563/*
564 * this used to be much more involved, and I'm keeping it just in case
565 * things get ugly again. it gets called by flush_commit_list, and
566 * cleans up any data stored about blocks freed during a transaction.
567 */
568static void cleanup_freed_for_journal_list(struct super_block *sb,
569 struct reiserfs_journal_list *jl)
570{
571
572 struct reiserfs_list_bitmap *jb = jl->j_list_bitmap;
573 if (jb) {
574 cleanup_bitmap_list(sb, jb);
575 }
576 jl->j_list_bitmap->journal_list = NULL;
577 jl->j_list_bitmap = NULL;
578}
579
580static int journal_list_still_alive(struct super_block *s,
581 unsigned int trans_id)
582{
583 struct reiserfs_journal *journal = SB_JOURNAL(s);
584 struct list_head *entry = &journal->j_journal_list;
585 struct reiserfs_journal_list *jl;
586
587 if (!list_empty(entry)) {
588 jl = JOURNAL_LIST_ENTRY(entry->next);
589 if (jl->j_trans_id <= trans_id) {
590 return 1;
591 }
592 }
593 return 0;
594}
595
596/*
597 * If page->mapping was null, we failed to truncate this page for
598 * some reason. Most likely because it was truncated after being
599 * logged via data=journal.
600 *
601 * This does a check to see if the buffer belongs to one of these
602 * lost pages before doing the final put_bh. If page->mapping was
603 * null, it tries to free buffers on the page, which should make the
604 * final put_page drop the page from the lru.
605 */
606static void release_buffer_page(struct buffer_head *bh)
607{
608 struct page *page = bh->b_page;
609 if (!page->mapping && trylock_page(page)) {
610 get_page(page);
611 put_bh(bh);
612 if (!page->mapping)
613 try_to_free_buffers(page);
614 unlock_page(page);
615 put_page(page);
616 } else {
617 put_bh(bh);
618 }
619}
620
621static void reiserfs_end_buffer_io_sync(struct buffer_head *bh, int uptodate)
622{
623 if (buffer_journaled(bh)) {
624 reiserfs_warning(NULL, "clm-2084",
625 "pinned buffer %lu:%pg sent to disk",
626 bh->b_blocknr, bh->b_bdev);
627 }
628 if (uptodate)
629 set_buffer_uptodate(bh);
630 else
631 clear_buffer_uptodate(bh);
632
633 unlock_buffer(bh);
634 release_buffer_page(bh);
635}
636
637static void reiserfs_end_ordered_io(struct buffer_head *bh, int uptodate)
638{
639 if (uptodate)
640 set_buffer_uptodate(bh);
641 else
642 clear_buffer_uptodate(bh);
643 unlock_buffer(bh);
644 put_bh(bh);
645}
646
647static void submit_logged_buffer(struct buffer_head *bh)
648{
649 get_bh(bh);
650 bh->b_end_io = reiserfs_end_buffer_io_sync;
651 clear_buffer_journal_new(bh);
652 clear_buffer_dirty(bh);
653 if (!test_clear_buffer_journal_test(bh))
654 BUG();
655 if (!buffer_uptodate(bh))
656 BUG();
657 submit_bh(REQ_OP_WRITE, 0, bh);
658}
659
660static void submit_ordered_buffer(struct buffer_head *bh)
661{
662 get_bh(bh);
663 bh->b_end_io = reiserfs_end_ordered_io;
664 clear_buffer_dirty(bh);
665 if (!buffer_uptodate(bh))
666 BUG();
667 submit_bh(REQ_OP_WRITE, 0, bh);
668}
669
670#define CHUNK_SIZE 32
671struct buffer_chunk {
672 struct buffer_head *bh[CHUNK_SIZE];
673 int nr;
674};
675
676static void write_chunk(struct buffer_chunk *chunk)
677{
678 int i;
679 for (i = 0; i < chunk->nr; i++) {
680 submit_logged_buffer(chunk->bh[i]);
681 }
682 chunk->nr = 0;
683}
684
685static void write_ordered_chunk(struct buffer_chunk *chunk)
686{
687 int i;
688 for (i = 0; i < chunk->nr; i++) {
689 submit_ordered_buffer(chunk->bh[i]);
690 }
691 chunk->nr = 0;
692}
693
694static int add_to_chunk(struct buffer_chunk *chunk, struct buffer_head *bh,
695 spinlock_t * lock, void (fn) (struct buffer_chunk *))
696{
697 int ret = 0;
698 BUG_ON(chunk->nr >= CHUNK_SIZE);
699 chunk->bh[chunk->nr++] = bh;
700 if (chunk->nr >= CHUNK_SIZE) {
701 ret = 1;
702 if (lock) {
703 spin_unlock(lock);
704 fn(chunk);
705 spin_lock(lock);
706 } else {
707 fn(chunk);
708 }
709 }
710 return ret;
711}
712
713static atomic_t nr_reiserfs_jh = ATOMIC_INIT(0);
714static struct reiserfs_jh *alloc_jh(void)
715{
716 struct reiserfs_jh *jh;
717 while (1) {
718 jh = kmalloc(sizeof(*jh), GFP_NOFS);
719 if (jh) {
720 atomic_inc(&nr_reiserfs_jh);
721 return jh;
722 }
723 yield();
724 }
725}
726
727/*
728 * we want to free the jh when the buffer has been written
729 * and waited on
730 */
731void reiserfs_free_jh(struct buffer_head *bh)
732{
733 struct reiserfs_jh *jh;
734
735 jh = bh->b_private;
736 if (jh) {
737 bh->b_private = NULL;
738 jh->bh = NULL;
739 list_del_init(&jh->list);
740 kfree(jh);
741 if (atomic_read(&nr_reiserfs_jh) <= 0)
742 BUG();
743 atomic_dec(&nr_reiserfs_jh);
744 put_bh(bh);
745 }
746}
747
748static inline int __add_jh(struct reiserfs_journal *j, struct buffer_head *bh,
749 int tail)
750{
751 struct reiserfs_jh *jh;
752
753 if (bh->b_private) {
754 spin_lock(&j->j_dirty_buffers_lock);
755 if (!bh->b_private) {
756 spin_unlock(&j->j_dirty_buffers_lock);
757 goto no_jh;
758 }
759 jh = bh->b_private;
760 list_del_init(&jh->list);
761 } else {
762no_jh:
763 get_bh(bh);
764 jh = alloc_jh();
765 spin_lock(&j->j_dirty_buffers_lock);
766 /*
767 * buffer must be locked for __add_jh, should be able to have
768 * two adds at the same time
769 */
770 BUG_ON(bh->b_private);
771 jh->bh = bh;
772 bh->b_private = jh;
773 }
774 jh->jl = j->j_current_jl;
775 if (tail)
776 list_add_tail(&jh->list, &jh->jl->j_tail_bh_list);
777 else {
778 list_add_tail(&jh->list, &jh->jl->j_bh_list);
779 }
780 spin_unlock(&j->j_dirty_buffers_lock);
781 return 0;
782}
783
784int reiserfs_add_tail_list(struct inode *inode, struct buffer_head *bh)
785{
786 return __add_jh(SB_JOURNAL(inode->i_sb), bh, 1);
787}
788int reiserfs_add_ordered_list(struct inode *inode, struct buffer_head *bh)
789{
790 return __add_jh(SB_JOURNAL(inode->i_sb), bh, 0);
791}
792
793#define JH_ENTRY(l) list_entry((l), struct reiserfs_jh, list)
794static int write_ordered_buffers(spinlock_t * lock,
795 struct reiserfs_journal *j,
796 struct reiserfs_journal_list *jl,
797 struct list_head *list)
798{
799 struct buffer_head *bh;
800 struct reiserfs_jh *jh;
801 int ret = j->j_errno;
802 struct buffer_chunk chunk;
803 struct list_head tmp;
804 INIT_LIST_HEAD(&tmp);
805
806 chunk.nr = 0;
807 spin_lock(lock);
808 while (!list_empty(list)) {
809 jh = JH_ENTRY(list->next);
810 bh = jh->bh;
811 get_bh(bh);
812 if (!trylock_buffer(bh)) {
813 if (!buffer_dirty(bh)) {
814 list_move(&jh->list, &tmp);
815 goto loop_next;
816 }
817 spin_unlock(lock);
818 if (chunk.nr)
819 write_ordered_chunk(&chunk);
820 wait_on_buffer(bh);
821 cond_resched();
822 spin_lock(lock);
823 goto loop_next;
824 }
825 /*
826 * in theory, dirty non-uptodate buffers should never get here,
827 * but the upper layer io error paths still have a few quirks.
828 * Handle them here as gracefully as we can
829 */
830 if (!buffer_uptodate(bh) && buffer_dirty(bh)) {
831 clear_buffer_dirty(bh);
832 ret = -EIO;
833 }
834 if (buffer_dirty(bh)) {
835 list_move(&jh->list, &tmp);
836 add_to_chunk(&chunk, bh, lock, write_ordered_chunk);
837 } else {
838 reiserfs_free_jh(bh);
839 unlock_buffer(bh);
840 }
841loop_next:
842 put_bh(bh);
843 cond_resched_lock(lock);
844 }
845 if (chunk.nr) {
846 spin_unlock(lock);
847 write_ordered_chunk(&chunk);
848 spin_lock(lock);
849 }
850 while (!list_empty(&tmp)) {
851 jh = JH_ENTRY(tmp.prev);
852 bh = jh->bh;
853 get_bh(bh);
854 reiserfs_free_jh(bh);
855
856 if (buffer_locked(bh)) {
857 spin_unlock(lock);
858 wait_on_buffer(bh);
859 spin_lock(lock);
860 }
861 if (!buffer_uptodate(bh)) {
862 ret = -EIO;
863 }
864 /*
865 * ugly interaction with invalidatepage here.
866 * reiserfs_invalidate_page will pin any buffer that has a
867 * valid journal head from an older transaction. If someone
868 * else sets our buffer dirty after we write it in the first
869 * loop, and then someone truncates the page away, nobody
870 * will ever write the buffer. We're safe if we write the
871 * page one last time after freeing the journal header.
872 */
873 if (buffer_dirty(bh) && unlikely(bh->b_page->mapping == NULL)) {
874 spin_unlock(lock);
875 ll_rw_block(REQ_OP_WRITE, 0, 1, &bh);
876 spin_lock(lock);
877 }
878 put_bh(bh);
879 cond_resched_lock(lock);
880 }
881 spin_unlock(lock);
882 return ret;
883}
884
885static int flush_older_commits(struct super_block *s,
886 struct reiserfs_journal_list *jl)
887{
888 struct reiserfs_journal *journal = SB_JOURNAL(s);
889 struct reiserfs_journal_list *other_jl;
890 struct reiserfs_journal_list *first_jl;
891 struct list_head *entry;
892 unsigned int trans_id = jl->j_trans_id;
893 unsigned int other_trans_id;
894
895find_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 entry = &first_jl->j_list;
917 while (1) {
918 other_jl = JOURNAL_LIST_ENTRY(entry);
919 other_trans_id = other_jl->j_trans_id;
920
921 if (other_trans_id < trans_id) {
922 if (atomic_read(&other_jl->j_commit_left) != 0) {
923 flush_commit_list(s, other_jl, 0);
924
925 /* list we were called with is gone, return */
926 if (!journal_list_still_alive(s, trans_id))
927 return 1;
928
929 /*
930 * the one we just flushed is gone, this means
931 * all older lists are also gone, so first_jl
932 * is no longer valid either. Go back to the
933 * beginning.
934 */
935 if (!journal_list_still_alive
936 (s, other_trans_id)) {
937 goto find_first;
938 }
939 }
940 entry = entry->next;
941 if (entry == &journal->j_journal_list)
942 return 0;
943 } else {
944 return 0;
945 }
946 }
947 return 0;
948}
949
950static int reiserfs_async_progress_wait(struct super_block *s)
951{
952 struct reiserfs_journal *j = SB_JOURNAL(s);
953
954 if (atomic_read(&j->j_async_throttle)) {
955 int depth;
956
957 depth = reiserfs_write_unlock_nested(s);
958 congestion_wait(BLK_RW_ASYNC, HZ / 10);
959 reiserfs_write_lock_nested(s, depth);
960 }
961
962 return 0;
963}
964
965/*
966 * if this journal list still has commit blocks unflushed, send them to disk.
967 *
968 * log areas must be flushed in order (transaction 2 can't commit before
969 * transaction 1) Before the commit block can by written, every other log
970 * block must be safely on disk
971 */
972static int flush_commit_list(struct super_block *s,
973 struct reiserfs_journal_list *jl, int flushall)
974{
975 int i;
976 b_blocknr_t bn;
977 struct buffer_head *tbh = NULL;
978 unsigned int trans_id = jl->j_trans_id;
979 struct reiserfs_journal *journal = SB_JOURNAL(s);
980 int retval = 0;
981 int write_len;
982 int depth;
983
984 reiserfs_check_lock_depth(s, "flush_commit_list");
985
986 if (atomic_read(&jl->j_older_commits_done)) {
987 return 0;
988 }
989
990 /*
991 * before we can put our commit blocks on disk, we have to make
992 * sure everyone older than us is on disk too
993 */
994 BUG_ON(jl->j_len <= 0);
995 BUG_ON(trans_id == journal->j_trans_id);
996
997 get_journal_list(jl);
998 if (flushall) {
999 if (flush_older_commits(s, jl) == 1) {
1000 /*
1001 * list disappeared during flush_older_commits.
1002 * return
1003 */
1004 goto put_jl;
1005 }
1006 }
1007
1008 /* make sure nobody is trying to flush this one at the same time */
1009 reiserfs_mutex_lock_safe(&jl->j_commit_mutex, s);
1010
1011 if (!journal_list_still_alive(s, trans_id)) {
1012 mutex_unlock(&jl->j_commit_mutex);
1013 goto put_jl;
1014 }
1015 BUG_ON(jl->j_trans_id == 0);
1016
1017 /* this commit is done, exit */
1018 if (atomic_read(&jl->j_commit_left) <= 0) {
1019 if (flushall) {
1020 atomic_set(&jl->j_older_commits_done, 1);
1021 }
1022 mutex_unlock(&jl->j_commit_mutex);
1023 goto put_jl;
1024 }
1025
1026 if (!list_empty(&jl->j_bh_list)) {
1027 int ret;
1028
1029 /*
1030 * We might sleep in numerous places inside
1031 * write_ordered_buffers. Relax the write lock.
1032 */
1033 depth = reiserfs_write_unlock_nested(s);
1034 ret = write_ordered_buffers(&journal->j_dirty_buffers_lock,
1035 journal, jl, &jl->j_bh_list);
1036 if (ret < 0 && retval == 0)
1037 retval = ret;
1038 reiserfs_write_lock_nested(s, depth);
1039 }
1040 BUG_ON(!list_empty(&jl->j_bh_list));
1041 /*
1042 * for the description block and all the log blocks, submit any buffers
1043 * that haven't already reached the disk. Try to write at least 256
1044 * log blocks. later on, we will only wait on blocks that correspond
1045 * to this transaction, but while we're unplugging we might as well
1046 * get a chunk of data on there.
1047 */
1048 atomic_inc(&journal->j_async_throttle);
1049 write_len = jl->j_len + 1;
1050 if (write_len < 256)
1051 write_len = 256;
1052 for (i = 0 ; i < write_len ; i++) {
1053 bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) + (jl->j_start + i) %
1054 SB_ONDISK_JOURNAL_SIZE(s);
1055 tbh = journal_find_get_block(s, bn);
1056 if (tbh) {
1057 if (buffer_dirty(tbh)) {
1058 depth = reiserfs_write_unlock_nested(s);
1059 ll_rw_block(REQ_OP_WRITE, 0, 1, &tbh);
1060 reiserfs_write_lock_nested(s, depth);
1061 }
1062 put_bh(tbh) ;
1063 }
1064 }
1065 atomic_dec(&journal->j_async_throttle);
1066
1067 for (i = 0; i < (jl->j_len + 1); i++) {
1068 bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) +
1069 (jl->j_start + i) % SB_ONDISK_JOURNAL_SIZE(s);
1070 tbh = journal_find_get_block(s, bn);
1071
1072 depth = reiserfs_write_unlock_nested(s);
1073 __wait_on_buffer(tbh);
1074 reiserfs_write_lock_nested(s, depth);
1075 /*
1076 * since we're using ll_rw_blk above, it might have skipped
1077 * over a locked buffer. Double check here
1078 */
1079 /* redundant, sync_dirty_buffer() checks */
1080 if (buffer_dirty(tbh)) {
1081 depth = reiserfs_write_unlock_nested(s);
1082 sync_dirty_buffer(tbh);
1083 reiserfs_write_lock_nested(s, depth);
1084 }
1085 if (unlikely(!buffer_uptodate(tbh))) {
1086#ifdef CONFIG_REISERFS_CHECK
1087 reiserfs_warning(s, "journal-601",
1088 "buffer write failed");
1089#endif
1090 retval = -EIO;
1091 }
1092 /* once for journal_find_get_block */
1093 put_bh(tbh);
1094 /* once due to original getblk in do_journal_end */
1095 put_bh(tbh);
1096 atomic_dec(&jl->j_commit_left);
1097 }
1098
1099 BUG_ON(atomic_read(&jl->j_commit_left) != 1);
1100
1101 /*
1102 * If there was a write error in the journal - we can't commit
1103 * this transaction - it will be invalid and, if successful,
1104 * will just end up propagating the write error out to
1105 * the file system.
1106 */
1107 if (likely(!retval && !reiserfs_is_journal_aborted (journal))) {
1108 if (buffer_dirty(jl->j_commit_bh))
1109 BUG();
1110 mark_buffer_dirty(jl->j_commit_bh) ;
1111 depth = reiserfs_write_unlock_nested(s);
1112 if (reiserfs_barrier_flush(s))
1113 __sync_dirty_buffer(jl->j_commit_bh,
1114 REQ_SYNC | REQ_PREFLUSH | REQ_FUA);
1115 else
1116 sync_dirty_buffer(jl->j_commit_bh);
1117 reiserfs_write_lock_nested(s, depth);
1118 }
1119
1120 /*
1121 * If there was a write error in the journal - we can't commit this
1122 * transaction - it will be invalid and, if successful, will just end
1123 * up propagating the write error out to the filesystem.
1124 */
1125 if (unlikely(!buffer_uptodate(jl->j_commit_bh))) {
1126#ifdef CONFIG_REISERFS_CHECK
1127 reiserfs_warning(s, "journal-615", "buffer write failed");
1128#endif
1129 retval = -EIO;
1130 }
1131 bforget(jl->j_commit_bh);
1132 if (journal->j_last_commit_id != 0 &&
1133 (jl->j_trans_id - journal->j_last_commit_id) != 1) {
1134 reiserfs_warning(s, "clm-2200", "last commit %lu, current %lu",
1135 journal->j_last_commit_id, jl->j_trans_id);
1136 }
1137 journal->j_last_commit_id = jl->j_trans_id;
1138
1139 /*
1140 * now, every commit block is on the disk. It is safe to allow
1141 * blocks freed during this transaction to be reallocated
1142 */
1143 cleanup_freed_for_journal_list(s, jl);
1144
1145 retval = retval ? retval : journal->j_errno;
1146
1147 /* mark the metadata dirty */
1148 if (!retval)
1149 dirty_one_transaction(s, jl);
1150 atomic_dec(&jl->j_commit_left);
1151
1152 if (flushall) {
1153 atomic_set(&jl->j_older_commits_done, 1);
1154 }
1155 mutex_unlock(&jl->j_commit_mutex);
1156put_jl:
1157 put_journal_list(s, jl);
1158
1159 if (retval)
1160 reiserfs_abort(s, retval, "Journal write error in %s",
1161 __func__);
1162 return retval;
1163}
1164
1165/*
1166 * flush_journal_list frequently needs to find a newer transaction for a
1167 * given block. This does that, or returns NULL if it can't find anything
1168 */
1169static struct reiserfs_journal_list *find_newer_jl_for_cn(struct
1170 reiserfs_journal_cnode
1171 *cn)
1172{
1173 struct super_block *sb = cn->sb;
1174 b_blocknr_t blocknr = cn->blocknr;
1175
1176 cn = cn->hprev;
1177 while (cn) {
1178 if (cn->sb == sb && cn->blocknr == blocknr && cn->jlist) {
1179 return cn->jlist;
1180 }
1181 cn = cn->hprev;
1182 }
1183 return NULL;
1184}
1185
1186static void remove_journal_hash(struct super_block *,
1187 struct reiserfs_journal_cnode **,
1188 struct reiserfs_journal_list *, unsigned long,
1189 int);
1190
1191/*
1192 * once all the real blocks have been flushed, it is safe to remove them
1193 * from the journal list for this transaction. Aside from freeing the
1194 * cnode, this also allows the block to be reallocated for data blocks
1195 * if it had been deleted.
1196 */
1197static void remove_all_from_journal_list(struct super_block *sb,
1198 struct reiserfs_journal_list *jl,
1199 int debug)
1200{
1201 struct reiserfs_journal *journal = SB_JOURNAL(sb);
1202 struct reiserfs_journal_cnode *cn, *last;
1203 cn = jl->j_realblock;
1204
1205 /*
1206 * which is better, to lock once around the whole loop, or
1207 * to lock for each call to remove_journal_hash?
1208 */
1209 while (cn) {
1210 if (cn->blocknr != 0) {
1211 if (debug) {
1212 reiserfs_warning(sb, "reiserfs-2201",
1213 "block %u, bh is %d, state %ld",
1214 cn->blocknr, cn->bh ? 1 : 0,
1215 cn->state);
1216 }
1217 cn->state = 0;
1218 remove_journal_hash(sb, journal->j_list_hash_table,
1219 jl, cn->blocknr, 1);
1220 }
1221 last = cn;
1222 cn = cn->next;
1223 free_cnode(sb, last);
1224 }
1225 jl->j_realblock = NULL;
1226}
1227
1228/*
1229 * if this timestamp is greater than the timestamp we wrote last to the
1230 * header block, write it to the header block. once this is done, I can
1231 * safely say the log area for this transaction won't ever be replayed,
1232 * and I can start releasing blocks in this transaction for reuse as data
1233 * blocks. called by flush_journal_list, before it calls
1234 * remove_all_from_journal_list
1235 */
1236static int _update_journal_header_block(struct super_block *sb,
1237 unsigned long offset,
1238 unsigned int trans_id)
1239{
1240 struct reiserfs_journal_header *jh;
1241 struct reiserfs_journal *journal = SB_JOURNAL(sb);
1242 int depth;
1243
1244 if (reiserfs_is_journal_aborted(journal))
1245 return -EIO;
1246
1247 if (trans_id >= journal->j_last_flush_trans_id) {
1248 if (buffer_locked((journal->j_header_bh))) {
1249 depth = reiserfs_write_unlock_nested(sb);
1250 __wait_on_buffer(journal->j_header_bh);
1251 reiserfs_write_lock_nested(sb, depth);
1252 if (unlikely(!buffer_uptodate(journal->j_header_bh))) {
1253#ifdef CONFIG_REISERFS_CHECK
1254 reiserfs_warning(sb, "journal-699",
1255 "buffer write failed");
1256#endif
1257 return -EIO;
1258 }
1259 }
1260 journal->j_last_flush_trans_id = trans_id;
1261 journal->j_first_unflushed_offset = offset;
1262 jh = (struct reiserfs_journal_header *)(journal->j_header_bh->
1263 b_data);
1264 jh->j_last_flush_trans_id = cpu_to_le32(trans_id);
1265 jh->j_first_unflushed_offset = cpu_to_le32(offset);
1266 jh->j_mount_id = cpu_to_le32(journal->j_mount_id);
1267
1268 set_buffer_dirty(journal->j_header_bh);
1269 depth = reiserfs_write_unlock_nested(sb);
1270
1271 if (reiserfs_barrier_flush(sb))
1272 __sync_dirty_buffer(journal->j_header_bh,
1273 REQ_SYNC | REQ_PREFLUSH | REQ_FUA);
1274 else
1275 sync_dirty_buffer(journal->j_header_bh);
1276
1277 reiserfs_write_lock_nested(sb, depth);
1278 if (!buffer_uptodate(journal->j_header_bh)) {
1279 reiserfs_warning(sb, "journal-837",
1280 "IO error during journal replay");
1281 return -EIO;
1282 }
1283 }
1284 return 0;
1285}
1286
1287static int update_journal_header_block(struct super_block *sb,
1288 unsigned long offset,
1289 unsigned int trans_id)
1290{
1291 return _update_journal_header_block(sb, offset, trans_id);
1292}
1293
1294/*
1295** flush any and all journal lists older than you are
1296** can only be called from flush_journal_list
1297*/
1298static int flush_older_journal_lists(struct super_block *sb,
1299 struct reiserfs_journal_list *jl)
1300{
1301 struct list_head *entry;
1302 struct reiserfs_journal_list *other_jl;
1303 struct reiserfs_journal *journal = SB_JOURNAL(sb);
1304 unsigned int trans_id = jl->j_trans_id;
1305
1306 /*
1307 * we know we are the only ones flushing things, no extra race
1308 * protection is required.
1309 */
1310restart:
1311 entry = journal->j_journal_list.next;
1312 /* Did we wrap? */
1313 if (entry == &journal->j_journal_list)
1314 return 0;
1315 other_jl = JOURNAL_LIST_ENTRY(entry);
1316 if (other_jl->j_trans_id < trans_id) {
1317 BUG_ON(other_jl->j_refcount <= 0);
1318 /* do not flush all */
1319 flush_journal_list(sb, other_jl, 0);
1320
1321 /* other_jl is now deleted from the list */
1322 goto restart;
1323 }
1324 return 0;
1325}
1326
1327static void del_from_work_list(struct super_block *s,
1328 struct reiserfs_journal_list *jl)
1329{
1330 struct reiserfs_journal *journal = SB_JOURNAL(s);
1331 if (!list_empty(&jl->j_working_list)) {
1332 list_del_init(&jl->j_working_list);
1333 journal->j_num_work_lists--;
1334 }
1335}
1336
1337/*
1338 * flush a journal list, both commit and real blocks
1339 *
1340 * always set flushall to 1, unless you are calling from inside
1341 * flush_journal_list
1342 *
1343 * IMPORTANT. This can only be called while there are no journal writers,
1344 * and the journal is locked. That means it can only be called from
1345 * do_journal_end, or by journal_release
1346 */
1347static int flush_journal_list(struct super_block *s,
1348 struct reiserfs_journal_list *jl, int flushall)
1349{
1350 struct reiserfs_journal_list *pjl;
1351 struct reiserfs_journal_cnode *cn;
1352 int count;
1353 int was_jwait = 0;
1354 int was_dirty = 0;
1355 struct buffer_head *saved_bh;
1356 unsigned long j_len_saved = jl->j_len;
1357 struct reiserfs_journal *journal = SB_JOURNAL(s);
1358 int err = 0;
1359 int depth;
1360
1361 BUG_ON(j_len_saved <= 0);
1362
1363 if (atomic_read(&journal->j_wcount) != 0) {
1364 reiserfs_warning(s, "clm-2048", "called with wcount %d",
1365 atomic_read(&journal->j_wcount));
1366 }
1367
1368 /* if flushall == 0, the lock is already held */
1369 if (flushall) {
1370 reiserfs_mutex_lock_safe(&journal->j_flush_mutex, s);
1371 } else if (mutex_trylock(&journal->j_flush_mutex)) {
1372 BUG();
1373 }
1374
1375 count = 0;
1376 if (j_len_saved > journal->j_trans_max) {
1377 reiserfs_panic(s, "journal-715", "length is %lu, trans id %lu",
1378 j_len_saved, jl->j_trans_id);
1379 return 0;
1380 }
1381
1382 /* if all the work is already done, get out of here */
1383 if (atomic_read(&jl->j_nonzerolen) <= 0 &&
1384 atomic_read(&jl->j_commit_left) <= 0) {
1385 goto flush_older_and_return;
1386 }
1387
1388 /*
1389 * start by putting the commit list on disk. This will also flush
1390 * the commit lists of any olders transactions
1391 */
1392 flush_commit_list(s, jl, 1);
1393
1394 if (!(jl->j_state & LIST_DIRTY)
1395 && !reiserfs_is_journal_aborted(journal))
1396 BUG();
1397
1398 /* are we done now? */
1399 if (atomic_read(&jl->j_nonzerolen) <= 0 &&
1400 atomic_read(&jl->j_commit_left) <= 0) {
1401 goto flush_older_and_return;
1402 }
1403
1404 /*
1405 * loop through each cnode, see if we need to write it,
1406 * or wait on a more recent transaction, or just ignore it
1407 */
1408 if (atomic_read(&journal->j_wcount) != 0) {
1409 reiserfs_panic(s, "journal-844", "journal list is flushing, "
1410 "wcount is not 0");
1411 }
1412 cn = jl->j_realblock;
1413 while (cn) {
1414 was_jwait = 0;
1415 was_dirty = 0;
1416 saved_bh = NULL;
1417 /* blocknr of 0 is no longer in the hash, ignore it */
1418 if (cn->blocknr == 0) {
1419 goto free_cnode;
1420 }
1421
1422 /*
1423 * This transaction failed commit.
1424 * Don't write out to the disk
1425 */
1426 if (!(jl->j_state & LIST_DIRTY))
1427 goto free_cnode;
1428
1429 pjl = find_newer_jl_for_cn(cn);
1430 /*
1431 * the order is important here. We check pjl to make sure we
1432 * don't clear BH_JDirty_wait if we aren't the one writing this
1433 * block to disk
1434 */
1435 if (!pjl && cn->bh) {
1436 saved_bh = cn->bh;
1437
1438 /*
1439 * we do this to make sure nobody releases the
1440 * buffer while we are working with it
1441 */
1442 get_bh(saved_bh);
1443
1444 if (buffer_journal_dirty(saved_bh)) {
1445 BUG_ON(!can_dirty(cn));
1446 was_jwait = 1;
1447 was_dirty = 1;
1448 } else if (can_dirty(cn)) {
1449 /*
1450 * everything with !pjl && jwait
1451 * should be writable
1452 */
1453 BUG();
1454 }
1455 }
1456
1457 /*
1458 * if someone has this block in a newer transaction, just make
1459 * sure they are committed, and don't try writing it to disk
1460 */
1461 if (pjl) {
1462 if (atomic_read(&pjl->j_commit_left))
1463 flush_commit_list(s, pjl, 1);
1464 goto free_cnode;
1465 }
1466
1467 /*
1468 * bh == NULL when the block got to disk on its own, OR,
1469 * the block got freed in a future transaction
1470 */
1471 if (saved_bh == NULL) {
1472 goto free_cnode;
1473 }
1474
1475 /*
1476 * this should never happen. kupdate_one_transaction has
1477 * this list locked while it works, so we should never see a
1478 * buffer here that is not marked JDirty_wait
1479 */
1480 if ((!was_jwait) && !buffer_locked(saved_bh)) {
1481 reiserfs_warning(s, "journal-813",
1482 "BAD! buffer %llu %cdirty %cjwait, "
1483 "not in a newer transaction",
1484 (unsigned long long)saved_bh->
1485 b_blocknr, was_dirty ? ' ' : '!',
1486 was_jwait ? ' ' : '!');
1487 }
1488 if (was_dirty) {
1489 /*
1490 * we inc again because saved_bh gets decremented
1491 * at free_cnode
1492 */
1493 get_bh(saved_bh);
1494 set_bit(BLOCK_NEEDS_FLUSH, &cn->state);
1495 lock_buffer(saved_bh);
1496 BUG_ON(cn->blocknr != saved_bh->b_blocknr);
1497 if (buffer_dirty(saved_bh))
1498 submit_logged_buffer(saved_bh);
1499 else
1500 unlock_buffer(saved_bh);
1501 count++;
1502 } else {
1503 reiserfs_warning(s, "clm-2082",
1504 "Unable to flush buffer %llu in %s",
1505 (unsigned long long)saved_bh->
1506 b_blocknr, __func__);
1507 }
1508free_cnode:
1509 cn = cn->next;
1510 if (saved_bh) {
1511 /*
1512 * we incremented this to keep others from
1513 * taking the buffer head away
1514 */
1515 put_bh(saved_bh);
1516 if (atomic_read(&saved_bh->b_count) < 0) {
1517 reiserfs_warning(s, "journal-945",
1518 "saved_bh->b_count < 0");
1519 }
1520 }
1521 }
1522 if (count > 0) {
1523 cn = jl->j_realblock;
1524 while (cn) {
1525 if (test_bit(BLOCK_NEEDS_FLUSH, &cn->state)) {
1526 if (!cn->bh) {
1527 reiserfs_panic(s, "journal-1011",
1528 "cn->bh is NULL");
1529 }
1530
1531 depth = reiserfs_write_unlock_nested(s);
1532 __wait_on_buffer(cn->bh);
1533 reiserfs_write_lock_nested(s, depth);
1534
1535 if (!cn->bh) {
1536 reiserfs_panic(s, "journal-1012",
1537 "cn->bh is NULL");
1538 }
1539 if (unlikely(!buffer_uptodate(cn->bh))) {
1540#ifdef CONFIG_REISERFS_CHECK
1541 reiserfs_warning(s, "journal-949",
1542 "buffer write failed");
1543#endif
1544 err = -EIO;
1545 }
1546 /*
1547 * note, we must clear the JDirty_wait bit
1548 * after the up to date check, otherwise we
1549 * race against our flushpage routine
1550 */
1551 BUG_ON(!test_clear_buffer_journal_dirty
1552 (cn->bh));
1553
1554 /* drop one ref for us */
1555 put_bh(cn->bh);
1556 /* drop one ref for journal_mark_dirty */
1557 release_buffer_page(cn->bh);
1558 }
1559 cn = cn->next;
1560 }
1561 }
1562
1563 if (err)
1564 reiserfs_abort(s, -EIO,
1565 "Write error while pushing transaction to disk in %s",
1566 __func__);
1567flush_older_and_return:
1568
1569 /*
1570 * before we can update the journal header block, we _must_ flush all
1571 * real blocks from all older transactions to disk. This is because
1572 * once the header block is updated, this transaction will not be
1573 * replayed after a crash
1574 */
1575 if (flushall) {
1576 flush_older_journal_lists(s, jl);
1577 }
1578
1579 err = journal->j_errno;
1580 /*
1581 * before we can remove everything from the hash tables for this
1582 * transaction, we must make sure it can never be replayed
1583 *
1584 * since we are only called from do_journal_end, we know for sure there
1585 * are no allocations going on while we are flushing journal lists. So,
1586 * we only need to update the journal header block for the last list
1587 * being flushed
1588 */
1589 if (!err && flushall) {
1590 err =
1591 update_journal_header_block(s,
1592 (jl->j_start + jl->j_len +
1593 2) % SB_ONDISK_JOURNAL_SIZE(s),
1594 jl->j_trans_id);
1595 if (err)
1596 reiserfs_abort(s, -EIO,
1597 "Write error while updating journal header in %s",
1598 __func__);
1599 }
1600 remove_all_from_journal_list(s, jl, 0);
1601 list_del_init(&jl->j_list);
1602 journal->j_num_lists--;
1603 del_from_work_list(s, jl);
1604
1605 if (journal->j_last_flush_id != 0 &&
1606 (jl->j_trans_id - journal->j_last_flush_id) != 1) {
1607 reiserfs_warning(s, "clm-2201", "last flush %lu, current %lu",
1608 journal->j_last_flush_id, jl->j_trans_id);
1609 }
1610 journal->j_last_flush_id = jl->j_trans_id;
1611
1612 /*
1613 * not strictly required since we are freeing the list, but it should
1614 * help find code using dead lists later on
1615 */
1616 jl->j_len = 0;
1617 atomic_set(&jl->j_nonzerolen, 0);
1618 jl->j_start = 0;
1619 jl->j_realblock = NULL;
1620 jl->j_commit_bh = NULL;
1621 jl->j_trans_id = 0;
1622 jl->j_state = 0;
1623 put_journal_list(s, jl);
1624 if (flushall)
1625 mutex_unlock(&journal->j_flush_mutex);
1626 return err;
1627}
1628
1629static int write_one_transaction(struct super_block *s,
1630 struct reiserfs_journal_list *jl,
1631 struct buffer_chunk *chunk)
1632{
1633 struct reiserfs_journal_cnode *cn;
1634 int ret = 0;
1635
1636 jl->j_state |= LIST_TOUCHED;
1637 del_from_work_list(s, jl);
1638 if (jl->j_len == 0 || atomic_read(&jl->j_nonzerolen) == 0) {
1639 return 0;
1640 }
1641
1642 cn = jl->j_realblock;
1643 while (cn) {
1644 /*
1645 * if the blocknr == 0, this has been cleared from the hash,
1646 * skip it
1647 */
1648 if (cn->blocknr == 0) {
1649 goto next;
1650 }
1651 if (cn->bh && can_dirty(cn) && buffer_dirty(cn->bh)) {
1652 struct buffer_head *tmp_bh;
1653 /*
1654 * we can race against journal_mark_freed when we try
1655 * to lock_buffer(cn->bh), so we have to inc the buffer
1656 * count, and recheck things after locking
1657 */
1658 tmp_bh = cn->bh;
1659 get_bh(tmp_bh);
1660 lock_buffer(tmp_bh);
1661 if (cn->bh && can_dirty(cn) && buffer_dirty(tmp_bh)) {
1662 if (!buffer_journal_dirty(tmp_bh) ||
1663 buffer_journal_prepared(tmp_bh))
1664 BUG();
1665 add_to_chunk(chunk, tmp_bh, NULL, write_chunk);
1666 ret++;
1667 } else {
1668 /* note, cn->bh might be null now */
1669 unlock_buffer(tmp_bh);
1670 }
1671 put_bh(tmp_bh);
1672 }
1673next:
1674 cn = cn->next;
1675 cond_resched();
1676 }
1677 return ret;
1678}
1679
1680/* used by flush_commit_list */
1681static void dirty_one_transaction(struct super_block *s,
1682 struct reiserfs_journal_list *jl)
1683{
1684 struct reiserfs_journal_cnode *cn;
1685 struct reiserfs_journal_list *pjl;
1686
1687 jl->j_state |= LIST_DIRTY;
1688 cn = jl->j_realblock;
1689 while (cn) {
1690 /*
1691 * look for a more recent transaction that logged this
1692 * buffer. Only the most recent transaction with a buffer in
1693 * it is allowed to send that buffer to disk
1694 */
1695 pjl = find_newer_jl_for_cn(cn);
1696 if (!pjl && cn->blocknr && cn->bh
1697 && buffer_journal_dirty(cn->bh)) {
1698 BUG_ON(!can_dirty(cn));
1699 /*
1700 * if the buffer is prepared, it will either be logged
1701 * or restored. If restored, we need to make sure
1702 * it actually gets marked dirty
1703 */
1704 clear_buffer_journal_new(cn->bh);
1705 if (buffer_journal_prepared(cn->bh)) {
1706 set_buffer_journal_restore_dirty(cn->bh);
1707 } else {
1708 set_buffer_journal_test(cn->bh);
1709 mark_buffer_dirty(cn->bh);
1710 }
1711 }
1712 cn = cn->next;
1713 }
1714}
1715
1716static int kupdate_transactions(struct super_block *s,
1717 struct reiserfs_journal_list *jl,
1718 struct reiserfs_journal_list **next_jl,
1719 unsigned int *next_trans_id,
1720 int num_blocks, int num_trans)
1721{
1722 int ret = 0;
1723 int written = 0;
1724 int transactions_flushed = 0;
1725 unsigned int orig_trans_id = jl->j_trans_id;
1726 struct buffer_chunk chunk;
1727 struct list_head *entry;
1728 struct reiserfs_journal *journal = SB_JOURNAL(s);
1729 chunk.nr = 0;
1730
1731 reiserfs_mutex_lock_safe(&journal->j_flush_mutex, s);
1732 if (!journal_list_still_alive(s, orig_trans_id)) {
1733 goto done;
1734 }
1735
1736 /*
1737 * we've got j_flush_mutex held, nobody is going to delete any
1738 * of these lists out from underneath us
1739 */
1740 while ((num_trans && transactions_flushed < num_trans) ||
1741 (!num_trans && written < num_blocks)) {
1742
1743 if (jl->j_len == 0 || (jl->j_state & LIST_TOUCHED) ||
1744 atomic_read(&jl->j_commit_left)
1745 || !(jl->j_state & LIST_DIRTY)) {
1746 del_from_work_list(s, jl);
1747 break;
1748 }
1749 ret = write_one_transaction(s, jl, &chunk);
1750
1751 if (ret < 0)
1752 goto done;
1753 transactions_flushed++;
1754 written += ret;
1755 entry = jl->j_list.next;
1756
1757 /* did we wrap? */
1758 if (entry == &journal->j_journal_list) {
1759 break;
1760 }
1761 jl = JOURNAL_LIST_ENTRY(entry);
1762
1763 /* don't bother with older transactions */
1764 if (jl->j_trans_id <= orig_trans_id)
1765 break;
1766 }
1767 if (chunk.nr) {
1768 write_chunk(&chunk);
1769 }
1770
1771done:
1772 mutex_unlock(&journal->j_flush_mutex);
1773 return ret;
1774}
1775
1776/*
1777 * for o_sync and fsync heavy applications, they tend to use
1778 * all the journa list slots with tiny transactions. These
1779 * trigger lots and lots of calls to update the header block, which
1780 * adds seeks and slows things down.
1781 *
1782 * This function tries to clear out a large chunk of the journal lists
1783 * at once, which makes everything faster since only the newest journal
1784 * list updates the header block
1785 */
1786static int flush_used_journal_lists(struct super_block *s,
1787 struct reiserfs_journal_list *jl)
1788{
1789 unsigned long len = 0;
1790 unsigned long cur_len;
1791 int i;
1792 int limit = 256;
1793 struct reiserfs_journal_list *tjl;
1794 struct reiserfs_journal_list *flush_jl;
1795 unsigned int trans_id;
1796 struct reiserfs_journal *journal = SB_JOURNAL(s);
1797
1798 flush_jl = tjl = jl;
1799
1800 /* in data logging mode, try harder to flush a lot of blocks */
1801 if (reiserfs_data_log(s))
1802 limit = 1024;
1803 /* flush for 256 transactions or limit blocks, whichever comes first */
1804 for (i = 0; i < 256 && len < limit; i++) {
1805 if (atomic_read(&tjl->j_commit_left) ||
1806 tjl->j_trans_id < jl->j_trans_id) {
1807 break;
1808 }
1809 cur_len = atomic_read(&tjl->j_nonzerolen);
1810 if (cur_len > 0) {
1811 tjl->j_state &= ~LIST_TOUCHED;
1812 }
1813 len += cur_len;
1814 flush_jl = tjl;
1815 if (tjl->j_list.next == &journal->j_journal_list)
1816 break;
1817 tjl = JOURNAL_LIST_ENTRY(tjl->j_list.next);
1818 }
1819 get_journal_list(jl);
1820 get_journal_list(flush_jl);
1821
1822 /*
1823 * try to find a group of blocks we can flush across all the
1824 * transactions, but only bother if we've actually spanned
1825 * across multiple lists
1826 */
1827 if (flush_jl != jl)
1828 kupdate_transactions(s, jl, &tjl, &trans_id, len, i);
1829
1830 flush_journal_list(s, flush_jl, 1);
1831 put_journal_list(s, flush_jl);
1832 put_journal_list(s, jl);
1833 return 0;
1834}
1835
1836/*
1837 * removes any nodes in table with name block and dev as bh.
1838 * only touchs the hnext and hprev pointers.
1839 */
1840static void remove_journal_hash(struct super_block *sb,
1841 struct reiserfs_journal_cnode **table,
1842 struct reiserfs_journal_list *jl,
1843 unsigned long block, int remove_freed)
1844{
1845 struct reiserfs_journal_cnode *cur;
1846 struct reiserfs_journal_cnode **head;
1847
1848 head = &(journal_hash(table, sb, block));
1849 if (!head) {
1850 return;
1851 }
1852 cur = *head;
1853 while (cur) {
1854 if (cur->blocknr == block && cur->sb == sb
1855 && (jl == NULL || jl == cur->jlist)
1856 && (!test_bit(BLOCK_FREED, &cur->state) || remove_freed)) {
1857 if (cur->hnext) {
1858 cur->hnext->hprev = cur->hprev;
1859 }
1860 if (cur->hprev) {
1861 cur->hprev->hnext = cur->hnext;
1862 } else {
1863 *head = cur->hnext;
1864 }
1865 cur->blocknr = 0;
1866 cur->sb = NULL;
1867 cur->state = 0;
1868 /*
1869 * anybody who clears the cur->bh will also
1870 * dec the nonzerolen
1871 */
1872 if (cur->bh && cur->jlist)
1873 atomic_dec(&cur->jlist->j_nonzerolen);
1874 cur->bh = NULL;
1875 cur->jlist = NULL;
1876 }
1877 cur = cur->hnext;
1878 }
1879}
1880
1881static void free_journal_ram(struct super_block *sb)
1882{
1883 struct reiserfs_journal *journal = SB_JOURNAL(sb);
1884 kfree(journal->j_current_jl);
1885 journal->j_num_lists--;
1886
1887 vfree(journal->j_cnode_free_orig);
1888 free_list_bitmaps(sb, journal->j_list_bitmap);
1889 free_bitmap_nodes(sb); /* must be after free_list_bitmaps */
1890 if (journal->j_header_bh) {
1891 brelse(journal->j_header_bh);
1892 }
1893 /*
1894 * j_header_bh is on the journal dev, make sure
1895 * not to release the journal dev until we brelse j_header_bh
1896 */
1897 release_journal_dev(sb, journal);
1898 vfree(journal);
1899}
1900
1901/*
1902 * call on unmount. Only set error to 1 if you haven't made your way out
1903 * of read_super() yet. Any other caller must keep error at 0.
1904 */
1905static int do_journal_release(struct reiserfs_transaction_handle *th,
1906 struct super_block *sb, int error)
1907{
1908 struct reiserfs_transaction_handle myth;
1909 struct reiserfs_journal *journal = SB_JOURNAL(sb);
1910
1911 /*
1912 * we only want to flush out transactions if we were
1913 * called with error == 0
1914 */
1915 if (!error && !sb_rdonly(sb)) {
1916 /* end the current trans */
1917 BUG_ON(!th->t_trans_id);
1918 do_journal_end(th, FLUSH_ALL);
1919
1920 /*
1921 * make sure something gets logged to force
1922 * our way into the flush code
1923 */
1924 if (!journal_join(&myth, sb)) {
1925 reiserfs_prepare_for_journal(sb,
1926 SB_BUFFER_WITH_SB(sb),
1927 1);
1928 journal_mark_dirty(&myth, SB_BUFFER_WITH_SB(sb));
1929 do_journal_end(&myth, FLUSH_ALL);
1930 }
1931 }
1932
1933 /* this also catches errors during the do_journal_end above */
1934 if (!error && reiserfs_is_journal_aborted(journal)) {
1935 memset(&myth, 0, sizeof(myth));
1936 if (!journal_join_abort(&myth, sb)) {
1937 reiserfs_prepare_for_journal(sb,
1938 SB_BUFFER_WITH_SB(sb),
1939 1);
1940 journal_mark_dirty(&myth, SB_BUFFER_WITH_SB(sb));
1941 do_journal_end(&myth, FLUSH_ALL);
1942 }
1943 }
1944
1945
1946 /*
1947 * We must release the write lock here because
1948 * the workqueue job (flush_async_commit) needs this lock
1949 */
1950 reiserfs_write_unlock(sb);
1951
1952 /*
1953 * Cancel flushing of old commits. Note that neither of these works
1954 * will be requeued because superblock is being shutdown and doesn't
1955 * have SB_ACTIVE set.
1956 */
1957 reiserfs_cancel_old_flush(sb);
1958 /* wait for all commits to finish */
1959 cancel_delayed_work_sync(&SB_JOURNAL(sb)->j_work);
1960
1961 free_journal_ram(sb);
1962
1963 reiserfs_write_lock(sb);
1964
1965 return 0;
1966}
1967
1968/* * call on unmount. flush all journal trans, release all alloc'd ram */
1969int journal_release(struct reiserfs_transaction_handle *th,
1970 struct super_block *sb)
1971{
1972 return do_journal_release(th, sb, 0);
1973}
1974
1975/* only call from an error condition inside reiserfs_read_super! */
1976int journal_release_error(struct reiserfs_transaction_handle *th,
1977 struct super_block *sb)
1978{
1979 return do_journal_release(th, sb, 1);
1980}
1981
1982/*
1983 * compares description block with commit block.
1984 * returns 1 if they differ, 0 if they are the same
1985 */
1986static int journal_compare_desc_commit(struct super_block *sb,
1987 struct reiserfs_journal_desc *desc,
1988 struct reiserfs_journal_commit *commit)
1989{
1990 if (get_commit_trans_id(commit) != get_desc_trans_id(desc) ||
1991 get_commit_trans_len(commit) != get_desc_trans_len(desc) ||
1992 get_commit_trans_len(commit) > SB_JOURNAL(sb)->j_trans_max ||
1993 get_commit_trans_len(commit) <= 0) {
1994 return 1;
1995 }
1996 return 0;
1997}
1998
1999/*
2000 * returns 0 if it did not find a description block
2001 * returns -1 if it found a corrupt commit block
2002 * returns 1 if both desc and commit were valid
2003 * NOTE: only called during fs mount
2004 */
2005static int journal_transaction_is_valid(struct super_block *sb,
2006 struct buffer_head *d_bh,
2007 unsigned int *oldest_invalid_trans_id,
2008 unsigned long *newest_mount_id)
2009{
2010 struct reiserfs_journal_desc *desc;
2011 struct reiserfs_journal_commit *commit;
2012 struct buffer_head *c_bh;
2013 unsigned long offset;
2014
2015 if (!d_bh)
2016 return 0;
2017
2018 desc = (struct reiserfs_journal_desc *)d_bh->b_data;
2019 if (get_desc_trans_len(desc) > 0
2020 && !memcmp(get_journal_desc_magic(d_bh), JOURNAL_DESC_MAGIC, 8)) {
2021 if (oldest_invalid_trans_id && *oldest_invalid_trans_id
2022 && get_desc_trans_id(desc) > *oldest_invalid_trans_id) {
2023 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2024 "journal-986: transaction "
2025 "is valid returning because trans_id %d is greater than "
2026 "oldest_invalid %lu",
2027 get_desc_trans_id(desc),
2028 *oldest_invalid_trans_id);
2029 return 0;
2030 }
2031 if (newest_mount_id
2032 && *newest_mount_id > get_desc_mount_id(desc)) {
2033 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2034 "journal-1087: transaction "
2035 "is valid returning because mount_id %d is less than "
2036 "newest_mount_id %lu",
2037 get_desc_mount_id(desc),
2038 *newest_mount_id);
2039 return -1;
2040 }
2041 if (get_desc_trans_len(desc) > SB_JOURNAL(sb)->j_trans_max) {
2042 reiserfs_warning(sb, "journal-2018",
2043 "Bad transaction length %d "
2044 "encountered, ignoring transaction",
2045 get_desc_trans_len(desc));
2046 return -1;
2047 }
2048 offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2049
2050 /*
2051 * ok, we have a journal description block,
2052 * let's see if the transaction was valid
2053 */
2054 c_bh =
2055 journal_bread(sb,
2056 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2057 ((offset + get_desc_trans_len(desc) +
2058 1) % SB_ONDISK_JOURNAL_SIZE(sb)));
2059 if (!c_bh)
2060 return 0;
2061 commit = (struct reiserfs_journal_commit *)c_bh->b_data;
2062 if (journal_compare_desc_commit(sb, desc, commit)) {
2063 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2064 "journal_transaction_is_valid, commit offset %ld had bad "
2065 "time %d or length %d",
2066 c_bh->b_blocknr -
2067 SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2068 get_commit_trans_id(commit),
2069 get_commit_trans_len(commit));
2070 brelse(c_bh);
2071 if (oldest_invalid_trans_id) {
2072 *oldest_invalid_trans_id =
2073 get_desc_trans_id(desc);
2074 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2075 "journal-1004: "
2076 "transaction_is_valid setting oldest invalid trans_id "
2077 "to %d",
2078 get_desc_trans_id(desc));
2079 }
2080 return -1;
2081 }
2082 brelse(c_bh);
2083 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2084 "journal-1006: found valid "
2085 "transaction start offset %llu, len %d id %d",
2086 d_bh->b_blocknr -
2087 SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2088 get_desc_trans_len(desc),
2089 get_desc_trans_id(desc));
2090 return 1;
2091 } else {
2092 return 0;
2093 }
2094}
2095
2096static void brelse_array(struct buffer_head **heads, int num)
2097{
2098 int i;
2099 for (i = 0; i < num; i++) {
2100 brelse(heads[i]);
2101 }
2102}
2103
2104/*
2105 * given the start, and values for the oldest acceptable transactions,
2106 * this either reads in a replays a transaction, or returns because the
2107 * transaction is invalid, or too old.
2108 * NOTE: only called during fs mount
2109 */
2110static int journal_read_transaction(struct super_block *sb,
2111 unsigned long cur_dblock,
2112 unsigned long oldest_start,
2113 unsigned int oldest_trans_id,
2114 unsigned long newest_mount_id)
2115{
2116 struct reiserfs_journal *journal = SB_JOURNAL(sb);
2117 struct reiserfs_journal_desc *desc;
2118 struct reiserfs_journal_commit *commit;
2119 unsigned int trans_id = 0;
2120 struct buffer_head *c_bh;
2121 struct buffer_head *d_bh;
2122 struct buffer_head **log_blocks = NULL;
2123 struct buffer_head **real_blocks = NULL;
2124 unsigned int trans_offset;
2125 int i;
2126 int trans_half;
2127
2128 d_bh = journal_bread(sb, cur_dblock);
2129 if (!d_bh)
2130 return 1;
2131 desc = (struct reiserfs_journal_desc *)d_bh->b_data;
2132 trans_offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2133 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1037: "
2134 "journal_read_transaction, offset %llu, len %d mount_id %d",
2135 d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2136 get_desc_trans_len(desc), get_desc_mount_id(desc));
2137 if (get_desc_trans_id(desc) < oldest_trans_id) {
2138 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1039: "
2139 "journal_read_trans skipping because %lu is too old",
2140 cur_dblock -
2141 SB_ONDISK_JOURNAL_1st_BLOCK(sb));
2142 brelse(d_bh);
2143 return 1;
2144 }
2145 if (get_desc_mount_id(desc) != newest_mount_id) {
2146 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1146: "
2147 "journal_read_trans skipping because %d is != "
2148 "newest_mount_id %lu", get_desc_mount_id(desc),
2149 newest_mount_id);
2150 brelse(d_bh);
2151 return 1;
2152 }
2153 c_bh = journal_bread(sb, SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2154 ((trans_offset + get_desc_trans_len(desc) + 1) %
2155 SB_ONDISK_JOURNAL_SIZE(sb)));
2156 if (!c_bh) {
2157 brelse(d_bh);
2158 return 1;
2159 }
2160 commit = (struct reiserfs_journal_commit *)c_bh->b_data;
2161 if (journal_compare_desc_commit(sb, desc, commit)) {
2162 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2163 "journal_read_transaction, "
2164 "commit offset %llu had bad time %d or length %d",
2165 c_bh->b_blocknr -
2166 SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2167 get_commit_trans_id(commit),
2168 get_commit_trans_len(commit));
2169 brelse(c_bh);
2170 brelse(d_bh);
2171 return 1;
2172 }
2173
2174 if (bdev_read_only(sb->s_bdev)) {
2175 reiserfs_warning(sb, "clm-2076",
2176 "device is readonly, unable to replay log");
2177 brelse(c_bh);
2178 brelse(d_bh);
2179 return -EROFS;
2180 }
2181
2182 trans_id = get_desc_trans_id(desc);
2183 /*
2184 * now we know we've got a good transaction, and it was
2185 * inside the valid time ranges
2186 */
2187 log_blocks = kmalloc_array(get_desc_trans_len(desc),
2188 sizeof(struct buffer_head *),
2189 GFP_NOFS);
2190 real_blocks = kmalloc_array(get_desc_trans_len(desc),
2191 sizeof(struct buffer_head *),
2192 GFP_NOFS);
2193 if (!log_blocks || !real_blocks) {
2194 brelse(c_bh);
2195 brelse(d_bh);
2196 kfree(log_blocks);
2197 kfree(real_blocks);
2198 reiserfs_warning(sb, "journal-1169",
2199 "kmalloc failed, unable to mount FS");
2200 return -1;
2201 }
2202 /* get all the buffer heads */
2203 trans_half = journal_trans_half(sb->s_blocksize);
2204 for (i = 0; i < get_desc_trans_len(desc); i++) {
2205 log_blocks[i] =
2206 journal_getblk(sb,
2207 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2208 (trans_offset + 1 +
2209 i) % SB_ONDISK_JOURNAL_SIZE(sb));
2210 if (i < trans_half) {
2211 real_blocks[i] =
2212 sb_getblk(sb,
2213 le32_to_cpu(desc->j_realblock[i]));
2214 } else {
2215 real_blocks[i] =
2216 sb_getblk(sb,
2217 le32_to_cpu(commit->
2218 j_realblock[i - trans_half]));
2219 }
2220 if (real_blocks[i]->b_blocknr > SB_BLOCK_COUNT(sb)) {
2221 reiserfs_warning(sb, "journal-1207",
2222 "REPLAY FAILURE fsck required! "
2223 "Block to replay is outside of "
2224 "filesystem");
2225 goto abort_replay;
2226 }
2227 /* make sure we don't try to replay onto log or reserved area */
2228 if (is_block_in_log_or_reserved_area
2229 (sb, real_blocks[i]->b_blocknr)) {
2230 reiserfs_warning(sb, "journal-1204",
2231 "REPLAY FAILURE fsck required! "
2232 "Trying to replay onto a log block");
2233abort_replay:
2234 brelse_array(log_blocks, i);
2235 brelse_array(real_blocks, i);
2236 brelse(c_bh);
2237 brelse(d_bh);
2238 kfree(log_blocks);
2239 kfree(real_blocks);
2240 return -1;
2241 }
2242 }
2243 /* read in the log blocks, memcpy to the corresponding real block */
2244 ll_rw_block(REQ_OP_READ, 0, get_desc_trans_len(desc), log_blocks);
2245 for (i = 0; i < get_desc_trans_len(desc); i++) {
2246
2247 wait_on_buffer(log_blocks[i]);
2248 if (!buffer_uptodate(log_blocks[i])) {
2249 reiserfs_warning(sb, "journal-1212",
2250 "REPLAY FAILURE fsck required! "
2251 "buffer write failed");
2252 brelse_array(log_blocks + i,
2253 get_desc_trans_len(desc) - i);
2254 brelse_array(real_blocks, get_desc_trans_len(desc));
2255 brelse(c_bh);
2256 brelse(d_bh);
2257 kfree(log_blocks);
2258 kfree(real_blocks);
2259 return -1;
2260 }
2261 memcpy(real_blocks[i]->b_data, log_blocks[i]->b_data,
2262 real_blocks[i]->b_size);
2263 set_buffer_uptodate(real_blocks[i]);
2264 brelse(log_blocks[i]);
2265 }
2266 /* flush out the real blocks */
2267 for (i = 0; i < get_desc_trans_len(desc); i++) {
2268 set_buffer_dirty(real_blocks[i]);
2269 write_dirty_buffer(real_blocks[i], 0);
2270 }
2271 for (i = 0; i < get_desc_trans_len(desc); i++) {
2272 wait_on_buffer(real_blocks[i]);
2273 if (!buffer_uptodate(real_blocks[i])) {
2274 reiserfs_warning(sb, "journal-1226",
2275 "REPLAY FAILURE, fsck required! "
2276 "buffer write failed");
2277 brelse_array(real_blocks + i,
2278 get_desc_trans_len(desc) - i);
2279 brelse(c_bh);
2280 brelse(d_bh);
2281 kfree(log_blocks);
2282 kfree(real_blocks);
2283 return -1;
2284 }
2285 brelse(real_blocks[i]);
2286 }
2287 cur_dblock =
2288 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2289 ((trans_offset + get_desc_trans_len(desc) +
2290 2) % SB_ONDISK_JOURNAL_SIZE(sb));
2291 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2292 "journal-1095: setting journal " "start to offset %ld",
2293 cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb));
2294
2295 /*
2296 * init starting values for the first transaction, in case
2297 * this is the last transaction to be replayed.
2298 */
2299 journal->j_start = cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2300 journal->j_last_flush_trans_id = trans_id;
2301 journal->j_trans_id = trans_id + 1;
2302 /* check for trans_id overflow */
2303 if (journal->j_trans_id == 0)
2304 journal->j_trans_id = 10;
2305 brelse(c_bh);
2306 brelse(d_bh);
2307 kfree(log_blocks);
2308 kfree(real_blocks);
2309 return 0;
2310}
2311
2312/*
2313 * This function reads blocks starting from block and to max_block of bufsize
2314 * size (but no more than BUFNR blocks at a time). This proved to improve
2315 * mounting speed on self-rebuilding raid5 arrays at least.
2316 * Right now it is only used from journal code. But later we might use it
2317 * from other places.
2318 * Note: Do not use journal_getblk/sb_getblk functions here!
2319 */
2320static struct buffer_head *reiserfs_breada(struct block_device *dev,
2321 b_blocknr_t block, int bufsize,
2322 b_blocknr_t max_block)
2323{
2324 struct buffer_head *bhlist[BUFNR];
2325 unsigned int blocks = BUFNR;
2326 struct buffer_head *bh;
2327 int i, j;
2328
2329 bh = __getblk(dev, block, bufsize);
2330 if (buffer_uptodate(bh))
2331 return (bh);
2332
2333 if (block + BUFNR > max_block) {
2334 blocks = max_block - block;
2335 }
2336 bhlist[0] = bh;
2337 j = 1;
2338 for (i = 1; i < blocks; i++) {
2339 bh = __getblk(dev, block + i, bufsize);
2340 if (buffer_uptodate(bh)) {
2341 brelse(bh);
2342 break;
2343 } else
2344 bhlist[j++] = bh;
2345 }
2346 ll_rw_block(REQ_OP_READ, 0, j, bhlist);
2347 for (i = 1; i < j; i++)
2348 brelse(bhlist[i]);
2349 bh = bhlist[0];
2350 wait_on_buffer(bh);
2351 if (buffer_uptodate(bh))
2352 return bh;
2353 brelse(bh);
2354 return NULL;
2355}
2356
2357/*
2358 * read and replay the log
2359 * on a clean unmount, the journal header's next unflushed pointer will be
2360 * to an invalid transaction. This tests that before finding all the
2361 * transactions in the log, which makes normal mount times fast.
2362 *
2363 * After a crash, this starts with the next unflushed transaction, and
2364 * replays until it finds one too old, or invalid.
2365 *
2366 * On exit, it sets things up so the first transaction will work correctly.
2367 * NOTE: only called during fs mount
2368 */
2369static int journal_read(struct super_block *sb)
2370{
2371 struct reiserfs_journal *journal = SB_JOURNAL(sb);
2372 struct reiserfs_journal_desc *desc;
2373 unsigned int oldest_trans_id = 0;
2374 unsigned int oldest_invalid_trans_id = 0;
2375 time64_t start;
2376 unsigned long oldest_start = 0;
2377 unsigned long cur_dblock = 0;
2378 unsigned long newest_mount_id = 9;
2379 struct buffer_head *d_bh;
2380 struct reiserfs_journal_header *jh;
2381 int valid_journal_header = 0;
2382 int replay_count = 0;
2383 int continue_replay = 1;
2384 int ret;
2385
2386 cur_dblock = SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2387 reiserfs_info(sb, "checking transaction log (%pg)\n",
2388 journal->j_dev_bd);
2389 start = ktime_get_seconds();
2390
2391 /*
2392 * step 1, read in the journal header block. Check the transaction
2393 * it says is the first unflushed, and if that transaction is not
2394 * valid, replay is done
2395 */
2396 journal->j_header_bh = journal_bread(sb,
2397 SB_ONDISK_JOURNAL_1st_BLOCK(sb)
2398 + SB_ONDISK_JOURNAL_SIZE(sb));
2399 if (!journal->j_header_bh) {
2400 return 1;
2401 }
2402 jh = (struct reiserfs_journal_header *)(journal->j_header_bh->b_data);
2403 if (le32_to_cpu(jh->j_first_unflushed_offset) <
2404 SB_ONDISK_JOURNAL_SIZE(sb)
2405 && le32_to_cpu(jh->j_last_flush_trans_id) > 0) {
2406 oldest_start =
2407 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2408 le32_to_cpu(jh->j_first_unflushed_offset);
2409 oldest_trans_id = le32_to_cpu(jh->j_last_flush_trans_id) + 1;
2410 newest_mount_id = le32_to_cpu(jh->j_mount_id);
2411 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2412 "journal-1153: found in "
2413 "header: first_unflushed_offset %d, last_flushed_trans_id "
2414 "%lu", le32_to_cpu(jh->j_first_unflushed_offset),
2415 le32_to_cpu(jh->j_last_flush_trans_id));
2416 valid_journal_header = 1;
2417
2418 /*
2419 * now, we try to read the first unflushed offset. If it
2420 * is not valid, there is nothing more we can do, and it
2421 * makes no sense to read through the whole log.
2422 */
2423 d_bh =
2424 journal_bread(sb,
2425 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2426 le32_to_cpu(jh->j_first_unflushed_offset));
2427 ret = journal_transaction_is_valid(sb, d_bh, NULL, NULL);
2428 if (!ret) {
2429 continue_replay = 0;
2430 }
2431 brelse(d_bh);
2432 goto start_log_replay;
2433 }
2434
2435 /*
2436 * ok, there are transactions that need to be replayed. start
2437 * with the first log block, find all the valid transactions, and
2438 * pick out the oldest.
2439 */
2440 while (continue_replay
2441 && cur_dblock <
2442 (SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2443 SB_ONDISK_JOURNAL_SIZE(sb))) {
2444 /*
2445 * Note that it is required for blocksize of primary fs
2446 * device and journal device to be the same
2447 */
2448 d_bh =
2449 reiserfs_breada(journal->j_dev_bd, cur_dblock,
2450 sb->s_blocksize,
2451 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2452 SB_ONDISK_JOURNAL_SIZE(sb));
2453 ret =
2454 journal_transaction_is_valid(sb, d_bh,
2455 &oldest_invalid_trans_id,
2456 &newest_mount_id);
2457 if (ret == 1) {
2458 desc = (struct reiserfs_journal_desc *)d_bh->b_data;
2459 if (oldest_start == 0) { /* init all oldest_ values */
2460 oldest_trans_id = get_desc_trans_id(desc);
2461 oldest_start = d_bh->b_blocknr;
2462 newest_mount_id = get_desc_mount_id(desc);
2463 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2464 "journal-1179: Setting "
2465 "oldest_start to offset %llu, trans_id %lu",
2466 oldest_start -
2467 SB_ONDISK_JOURNAL_1st_BLOCK
2468 (sb), oldest_trans_id);
2469 } else if (oldest_trans_id > get_desc_trans_id(desc)) {
2470 /* one we just read was older */
2471 oldest_trans_id = get_desc_trans_id(desc);
2472 oldest_start = d_bh->b_blocknr;
2473 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2474 "journal-1180: Resetting "
2475 "oldest_start to offset %lu, trans_id %lu",
2476 oldest_start -
2477 SB_ONDISK_JOURNAL_1st_BLOCK
2478 (sb), oldest_trans_id);
2479 }
2480 if (newest_mount_id < get_desc_mount_id(desc)) {
2481 newest_mount_id = get_desc_mount_id(desc);
2482 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2483 "journal-1299: Setting "
2484 "newest_mount_id to %d",
2485 get_desc_mount_id(desc));
2486 }
2487 cur_dblock += get_desc_trans_len(desc) + 2;
2488 } else {
2489 cur_dblock++;
2490 }
2491 brelse(d_bh);
2492 }
2493
2494start_log_replay:
2495 cur_dblock = oldest_start;
2496 if (oldest_trans_id) {
2497 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2498 "journal-1206: Starting replay "
2499 "from offset %llu, trans_id %lu",
2500 cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2501 oldest_trans_id);
2502
2503 }
2504 replay_count = 0;
2505 while (continue_replay && oldest_trans_id > 0) {
2506 ret =
2507 journal_read_transaction(sb, cur_dblock, oldest_start,
2508 oldest_trans_id, newest_mount_id);
2509 if (ret < 0) {
2510 return ret;
2511 } else if (ret != 0) {
2512 break;
2513 }
2514 cur_dblock =
2515 SB_ONDISK_JOURNAL_1st_BLOCK(sb) + journal->j_start;
2516 replay_count++;
2517 if (cur_dblock == oldest_start)
2518 break;
2519 }
2520
2521 if (oldest_trans_id == 0) {
2522 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2523 "journal-1225: No valid " "transactions found");
2524 }
2525 /*
2526 * j_start does not get set correctly if we don't replay any
2527 * transactions. if we had a valid journal_header, set j_start
2528 * to the first unflushed transaction value, copy the trans_id
2529 * from the header
2530 */
2531 if (valid_journal_header && replay_count == 0) {
2532 journal->j_start = le32_to_cpu(jh->j_first_unflushed_offset);
2533 journal->j_trans_id =
2534 le32_to_cpu(jh->j_last_flush_trans_id) + 1;
2535 /* check for trans_id overflow */
2536 if (journal->j_trans_id == 0)
2537 journal->j_trans_id = 10;
2538 journal->j_last_flush_trans_id =
2539 le32_to_cpu(jh->j_last_flush_trans_id);
2540 journal->j_mount_id = le32_to_cpu(jh->j_mount_id) + 1;
2541 } else {
2542 journal->j_mount_id = newest_mount_id + 1;
2543 }
2544 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1299: Setting "
2545 "newest_mount_id to %lu", journal->j_mount_id);
2546 journal->j_first_unflushed_offset = journal->j_start;
2547 if (replay_count > 0) {
2548 reiserfs_info(sb,
2549 "replayed %d transactions in %lu seconds\n",
2550 replay_count, ktime_get_seconds() - start);
2551 }
2552 /* needed to satisfy the locking in _update_journal_header_block */
2553 reiserfs_write_lock(sb);
2554 if (!bdev_read_only(sb->s_bdev) &&
2555 _update_journal_header_block(sb, journal->j_start,
2556 journal->j_last_flush_trans_id)) {
2557 reiserfs_write_unlock(sb);
2558 /*
2559 * replay failed, caller must call free_journal_ram and abort
2560 * the mount
2561 */
2562 return -1;
2563 }
2564 reiserfs_write_unlock(sb);
2565 return 0;
2566}
2567
2568static struct reiserfs_journal_list *alloc_journal_list(struct super_block *s)
2569{
2570 struct reiserfs_journal_list *jl;
2571 jl = kzalloc(sizeof(struct reiserfs_journal_list),
2572 GFP_NOFS | __GFP_NOFAIL);
2573 INIT_LIST_HEAD(&jl->j_list);
2574 INIT_LIST_HEAD(&jl->j_working_list);
2575 INIT_LIST_HEAD(&jl->j_tail_bh_list);
2576 INIT_LIST_HEAD(&jl->j_bh_list);
2577 mutex_init(&jl->j_commit_mutex);
2578 SB_JOURNAL(s)->j_num_lists++;
2579 get_journal_list(jl);
2580 return jl;
2581}
2582
2583static void journal_list_init(struct super_block *sb)
2584{
2585 SB_JOURNAL(sb)->j_current_jl = alloc_journal_list(sb);
2586}
2587
2588static void release_journal_dev(struct super_block *super,
2589 struct reiserfs_journal *journal)
2590{
2591 if (journal->j_dev_bd != NULL) {
2592 blkdev_put(journal->j_dev_bd, journal->j_dev_mode);
2593 journal->j_dev_bd = NULL;
2594 }
2595}
2596
2597static int journal_init_dev(struct super_block *super,
2598 struct reiserfs_journal *journal,
2599 const char *jdev_name)
2600{
2601 int result;
2602 dev_t jdev;
2603 fmode_t blkdev_mode = FMODE_READ | FMODE_WRITE | FMODE_EXCL;
2604 char b[BDEVNAME_SIZE];
2605
2606 result = 0;
2607
2608 journal->j_dev_bd = NULL;
2609 jdev = SB_ONDISK_JOURNAL_DEVICE(super) ?
2610 new_decode_dev(SB_ONDISK_JOURNAL_DEVICE(super)) : super->s_dev;
2611
2612 if (bdev_read_only(super->s_bdev))
2613 blkdev_mode = FMODE_READ;
2614
2615 /* there is no "jdev" option and journal is on separate device */
2616 if ((!jdev_name || !jdev_name[0])) {
2617 if (jdev == super->s_dev)
2618 blkdev_mode &= ~FMODE_EXCL;
2619 journal->j_dev_bd = blkdev_get_by_dev(jdev, blkdev_mode,
2620 journal);
2621 journal->j_dev_mode = blkdev_mode;
2622 if (IS_ERR(journal->j_dev_bd)) {
2623 result = PTR_ERR(journal->j_dev_bd);
2624 journal->j_dev_bd = NULL;
2625 reiserfs_warning(super, "sh-458",
2626 "cannot init journal device '%s': %i",
2627 __bdevname(jdev, b), result);
2628 return result;
2629 } else if (jdev != super->s_dev)
2630 set_blocksize(journal->j_dev_bd, super->s_blocksize);
2631
2632 return 0;
2633 }
2634
2635 journal->j_dev_mode = blkdev_mode;
2636 journal->j_dev_bd = blkdev_get_by_path(jdev_name, blkdev_mode, journal);
2637 if (IS_ERR(journal->j_dev_bd)) {
2638 result = PTR_ERR(journal->j_dev_bd);
2639 journal->j_dev_bd = NULL;
2640 reiserfs_warning(super, "sh-457",
2641 "journal_init_dev: Cannot open '%s': %i",
2642 jdev_name, result);
2643 return result;
2644 }
2645
2646 set_blocksize(journal->j_dev_bd, super->s_blocksize);
2647 reiserfs_info(super,
2648 "journal_init_dev: journal device: %pg\n",
2649 journal->j_dev_bd);
2650 return 0;
2651}
2652
2653/*
2654 * When creating/tuning a file system user can assign some
2655 * journal params within boundaries which depend on the ratio
2656 * blocksize/standard_blocksize.
2657 *
2658 * For blocks >= standard_blocksize transaction size should
2659 * be not less then JOURNAL_TRANS_MIN_DEFAULT, and not more
2660 * then JOURNAL_TRANS_MAX_DEFAULT.
2661 *
2662 * For blocks < standard_blocksize these boundaries should be
2663 * decreased proportionally.
2664 */
2665#define REISERFS_STANDARD_BLKSIZE (4096)
2666
2667static int check_advise_trans_params(struct super_block *sb,
2668 struct reiserfs_journal *journal)
2669{
2670 if (journal->j_trans_max) {
2671 /* Non-default journal params. Do sanity check for them. */
2672 int ratio = 1;
2673 if (sb->s_blocksize < REISERFS_STANDARD_BLKSIZE)
2674 ratio = REISERFS_STANDARD_BLKSIZE / sb->s_blocksize;
2675
2676 if (journal->j_trans_max > JOURNAL_TRANS_MAX_DEFAULT / ratio ||
2677 journal->j_trans_max < JOURNAL_TRANS_MIN_DEFAULT / ratio ||
2678 SB_ONDISK_JOURNAL_SIZE(sb) / journal->j_trans_max <
2679 JOURNAL_MIN_RATIO) {
2680 reiserfs_warning(sb, "sh-462",
2681 "bad transaction max size (%u). "
2682 "FSCK?", journal->j_trans_max);
2683 return 1;
2684 }
2685 if (journal->j_max_batch != (journal->j_trans_max) *
2686 JOURNAL_MAX_BATCH_DEFAULT/JOURNAL_TRANS_MAX_DEFAULT) {
2687 reiserfs_warning(sb, "sh-463",
2688 "bad transaction max batch (%u). "
2689 "FSCK?", journal->j_max_batch);
2690 return 1;
2691 }
2692 } else {
2693 /*
2694 * Default journal params.
2695 * The file system was created by old version
2696 * of mkreiserfs, so some fields contain zeros,
2697 * and we need to advise proper values for them
2698 */
2699 if (sb->s_blocksize != REISERFS_STANDARD_BLKSIZE) {
2700 reiserfs_warning(sb, "sh-464", "bad blocksize (%u)",
2701 sb->s_blocksize);
2702 return 1;
2703 }
2704 journal->j_trans_max = JOURNAL_TRANS_MAX_DEFAULT;
2705 journal->j_max_batch = JOURNAL_MAX_BATCH_DEFAULT;
2706 journal->j_max_commit_age = JOURNAL_MAX_COMMIT_AGE;
2707 }
2708 return 0;
2709}
2710
2711/* must be called once on fs mount. calls journal_read for you */
2712int journal_init(struct super_block *sb, const char *j_dev_name,
2713 int old_format, unsigned int commit_max_age)
2714{
2715 int num_cnodes = SB_ONDISK_JOURNAL_SIZE(sb) * 2;
2716 struct buffer_head *bhjh;
2717 struct reiserfs_super_block *rs;
2718 struct reiserfs_journal_header *jh;
2719 struct reiserfs_journal *journal;
2720 struct reiserfs_journal_list *jl;
2721 int ret;
2722
2723 journal = SB_JOURNAL(sb) = vzalloc(sizeof(struct reiserfs_journal));
2724 if (!journal) {
2725 reiserfs_warning(sb, "journal-1256",
2726 "unable to get memory for journal structure");
2727 return 1;
2728 }
2729 INIT_LIST_HEAD(&journal->j_bitmap_nodes);
2730 INIT_LIST_HEAD(&journal->j_prealloc_list);
2731 INIT_LIST_HEAD(&journal->j_working_list);
2732 INIT_LIST_HEAD(&journal->j_journal_list);
2733 journal->j_persistent_trans = 0;
2734 if (reiserfs_allocate_list_bitmaps(sb, journal->j_list_bitmap,
2735 reiserfs_bmap_count(sb)))
2736 goto free_and_return;
2737
2738 allocate_bitmap_nodes(sb);
2739
2740 /* reserved for journal area support */
2741 SB_JOURNAL_1st_RESERVED_BLOCK(sb) = (old_format ?
2742 REISERFS_OLD_DISK_OFFSET_IN_BYTES
2743 / sb->s_blocksize +
2744 reiserfs_bmap_count(sb) +
2745 1 :
2746 REISERFS_DISK_OFFSET_IN_BYTES /
2747 sb->s_blocksize + 2);
2748
2749 /*
2750 * Sanity check to see is the standard journal fitting
2751 * within first bitmap (actual for small blocksizes)
2752 */
2753 if (!SB_ONDISK_JOURNAL_DEVICE(sb) &&
2754 (SB_JOURNAL_1st_RESERVED_BLOCK(sb) +
2755 SB_ONDISK_JOURNAL_SIZE(sb) > sb->s_blocksize * 8)) {
2756 reiserfs_warning(sb, "journal-1393",
2757 "journal does not fit for area addressed "
2758 "by first of bitmap blocks. It starts at "
2759 "%u and its size is %u. Block size %ld",
2760 SB_JOURNAL_1st_RESERVED_BLOCK(sb),
2761 SB_ONDISK_JOURNAL_SIZE(sb),
2762 sb->s_blocksize);
2763 goto free_and_return;
2764 }
2765
2766 if (journal_init_dev(sb, journal, j_dev_name) != 0) {
2767 reiserfs_warning(sb, "sh-462",
2768 "unable to initialize journal device");
2769 goto free_and_return;
2770 }
2771
2772 rs = SB_DISK_SUPER_BLOCK(sb);
2773
2774 /* read journal header */
2775 bhjh = journal_bread(sb,
2776 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2777 SB_ONDISK_JOURNAL_SIZE(sb));
2778 if (!bhjh) {
2779 reiserfs_warning(sb, "sh-459",
2780 "unable to read journal header");
2781 goto free_and_return;
2782 }
2783 jh = (struct reiserfs_journal_header *)(bhjh->b_data);
2784
2785 /* make sure that journal matches to the super block */
2786 if (is_reiserfs_jr(rs)
2787 && (le32_to_cpu(jh->jh_journal.jp_journal_magic) !=
2788 sb_jp_journal_magic(rs))) {
2789 reiserfs_warning(sb, "sh-460",
2790 "journal header magic %x (device %pg) does "
2791 "not match to magic found in super block %x",
2792 jh->jh_journal.jp_journal_magic,
2793 journal->j_dev_bd,
2794 sb_jp_journal_magic(rs));
2795 brelse(bhjh);
2796 goto free_and_return;
2797 }
2798
2799 journal->j_trans_max = le32_to_cpu(jh->jh_journal.jp_journal_trans_max);
2800 journal->j_max_batch = le32_to_cpu(jh->jh_journal.jp_journal_max_batch);
2801 journal->j_max_commit_age =
2802 le32_to_cpu(jh->jh_journal.jp_journal_max_commit_age);
2803 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
2804
2805 if (check_advise_trans_params(sb, journal) != 0)
2806 goto free_and_return;
2807 journal->j_default_max_commit_age = journal->j_max_commit_age;
2808
2809 if (commit_max_age != 0) {
2810 journal->j_max_commit_age = commit_max_age;
2811 journal->j_max_trans_age = commit_max_age;
2812 }
2813
2814 reiserfs_info(sb, "journal params: device %pg, size %u, "
2815 "journal first block %u, max trans len %u, max batch %u, "
2816 "max commit age %u, max trans age %u\n",
2817 journal->j_dev_bd,
2818 SB_ONDISK_JOURNAL_SIZE(sb),
2819 SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2820 journal->j_trans_max,
2821 journal->j_max_batch,
2822 journal->j_max_commit_age, journal->j_max_trans_age);
2823
2824 brelse(bhjh);
2825
2826 journal->j_list_bitmap_index = 0;
2827 journal_list_init(sb);
2828
2829 memset(journal->j_list_hash_table, 0,
2830 JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *));
2831
2832 INIT_LIST_HEAD(&journal->j_dirty_buffers);
2833 spin_lock_init(&journal->j_dirty_buffers_lock);
2834
2835 journal->j_start = 0;
2836 journal->j_len = 0;
2837 journal->j_len_alloc = 0;
2838 atomic_set(&journal->j_wcount, 0);
2839 atomic_set(&journal->j_async_throttle, 0);
2840 journal->j_bcount = 0;
2841 journal->j_trans_start_time = 0;
2842 journal->j_last = NULL;
2843 journal->j_first = NULL;
2844 init_waitqueue_head(&journal->j_join_wait);
2845 mutex_init(&journal->j_mutex);
2846 mutex_init(&journal->j_flush_mutex);
2847
2848 journal->j_trans_id = 10;
2849 journal->j_mount_id = 10;
2850 journal->j_state = 0;
2851 atomic_set(&journal->j_jlock, 0);
2852 journal->j_cnode_free_list = allocate_cnodes(num_cnodes);
2853 journal->j_cnode_free_orig = journal->j_cnode_free_list;
2854 journal->j_cnode_free = journal->j_cnode_free_list ? num_cnodes : 0;
2855 journal->j_cnode_used = 0;
2856 journal->j_must_wait = 0;
2857
2858 if (journal->j_cnode_free == 0) {
2859 reiserfs_warning(sb, "journal-2004", "Journal cnode memory "
2860 "allocation failed (%ld bytes). Journal is "
2861 "too large for available memory. Usually "
2862 "this is due to a journal that is too large.",
2863 sizeof (struct reiserfs_journal_cnode) * num_cnodes);
2864 goto free_and_return;
2865 }
2866
2867 init_journal_hash(sb);
2868 jl = journal->j_current_jl;
2869
2870 /*
2871 * get_list_bitmap() may call flush_commit_list() which
2872 * requires the lock. Calling flush_commit_list() shouldn't happen
2873 * this early but I like to be paranoid.
2874 */
2875 reiserfs_write_lock(sb);
2876 jl->j_list_bitmap = get_list_bitmap(sb, jl);
2877 reiserfs_write_unlock(sb);
2878 if (!jl->j_list_bitmap) {
2879 reiserfs_warning(sb, "journal-2005",
2880 "get_list_bitmap failed for journal list 0");
2881 goto free_and_return;
2882 }
2883
2884 ret = journal_read(sb);
2885 if (ret < 0) {
2886 reiserfs_warning(sb, "reiserfs-2006",
2887 "Replay Failure, unable to mount");
2888 goto free_and_return;
2889 }
2890
2891 INIT_DELAYED_WORK(&journal->j_work, flush_async_commits);
2892 journal->j_work_sb = sb;
2893 return 0;
2894free_and_return:
2895 free_journal_ram(sb);
2896 return 1;
2897}
2898
2899/*
2900 * test for a polite end of the current transaction. Used by file_write,
2901 * and should be used by delete to make sure they don't write more than
2902 * can fit inside a single transaction
2903 */
2904int journal_transaction_should_end(struct reiserfs_transaction_handle *th,
2905 int new_alloc)
2906{
2907 struct reiserfs_journal *journal = SB_JOURNAL(th->t_super);
2908 time64_t now = ktime_get_seconds();
2909 /* cannot restart while nested */
2910 BUG_ON(!th->t_trans_id);
2911 if (th->t_refcount > 1)
2912 return 0;
2913 if (journal->j_must_wait > 0 ||
2914 (journal->j_len_alloc + new_alloc) >= journal->j_max_batch ||
2915 atomic_read(&journal->j_jlock) ||
2916 (now - journal->j_trans_start_time) > journal->j_max_trans_age ||
2917 journal->j_cnode_free < (journal->j_trans_max * 3)) {
2918 return 1;
2919 }
2920
2921 journal->j_len_alloc += new_alloc;
2922 th->t_blocks_allocated += new_alloc ;
2923 return 0;
2924}
2925
2926/* this must be called inside a transaction */
2927void reiserfs_block_writes(struct reiserfs_transaction_handle *th)
2928{
2929 struct reiserfs_journal *journal = SB_JOURNAL(th->t_super);
2930 BUG_ON(!th->t_trans_id);
2931 journal->j_must_wait = 1;
2932 set_bit(J_WRITERS_BLOCKED, &journal->j_state);
2933 return;
2934}
2935
2936/* this must be called without a transaction started */
2937void reiserfs_allow_writes(struct super_block *s)
2938{
2939 struct reiserfs_journal *journal = SB_JOURNAL(s);
2940 clear_bit(J_WRITERS_BLOCKED, &journal->j_state);
2941 wake_up(&journal->j_join_wait);
2942}
2943
2944/* this must be called without a transaction started */
2945void reiserfs_wait_on_write_block(struct super_block *s)
2946{
2947 struct reiserfs_journal *journal = SB_JOURNAL(s);
2948 wait_event(journal->j_join_wait,
2949 !test_bit(J_WRITERS_BLOCKED, &journal->j_state));
2950}
2951
2952static void queue_log_writer(struct super_block *s)
2953{
2954 wait_queue_entry_t wait;
2955 struct reiserfs_journal *journal = SB_JOURNAL(s);
2956 set_bit(J_WRITERS_QUEUED, &journal->j_state);
2957
2958 /*
2959 * we don't want to use wait_event here because
2960 * we only want to wait once.
2961 */
2962 init_waitqueue_entry(&wait, current);
2963 add_wait_queue(&journal->j_join_wait, &wait);
2964 set_current_state(TASK_UNINTERRUPTIBLE);
2965 if (test_bit(J_WRITERS_QUEUED, &journal->j_state)) {
2966 int depth = reiserfs_write_unlock_nested(s);
2967 schedule();
2968 reiserfs_write_lock_nested(s, depth);
2969 }
2970 __set_current_state(TASK_RUNNING);
2971 remove_wait_queue(&journal->j_join_wait, &wait);
2972}
2973
2974static void wake_queued_writers(struct super_block *s)
2975{
2976 struct reiserfs_journal *journal = SB_JOURNAL(s);
2977 if (test_and_clear_bit(J_WRITERS_QUEUED, &journal->j_state))
2978 wake_up(&journal->j_join_wait);
2979}
2980
2981static void let_transaction_grow(struct super_block *sb, unsigned int trans_id)
2982{
2983 struct reiserfs_journal *journal = SB_JOURNAL(sb);
2984 unsigned long bcount = journal->j_bcount;
2985 while (1) {
2986 int depth;
2987
2988 depth = reiserfs_write_unlock_nested(sb);
2989 schedule_timeout_uninterruptible(1);
2990 reiserfs_write_lock_nested(sb, depth);
2991
2992 journal->j_current_jl->j_state |= LIST_COMMIT_PENDING;
2993 while ((atomic_read(&journal->j_wcount) > 0 ||
2994 atomic_read(&journal->j_jlock)) &&
2995 journal->j_trans_id == trans_id) {
2996 queue_log_writer(sb);
2997 }
2998 if (journal->j_trans_id != trans_id)
2999 break;
3000 if (bcount == journal->j_bcount)
3001 break;
3002 bcount = journal->j_bcount;
3003 }
3004}
3005
3006/*
3007 * join == true if you must join an existing transaction.
3008 * join == false if you can deal with waiting for others to finish
3009 *
3010 * this will block until the transaction is joinable. send the number of
3011 * blocks you expect to use in nblocks.
3012*/
3013static int do_journal_begin_r(struct reiserfs_transaction_handle *th,
3014 struct super_block *sb, unsigned long nblocks,
3015 int join)
3016{
3017 time64_t now = ktime_get_seconds();
3018 unsigned int old_trans_id;
3019 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3020 struct reiserfs_transaction_handle myth;
3021 int sched_count = 0;
3022 int retval;
3023 int depth;
3024
3025 reiserfs_check_lock_depth(sb, "journal_begin");
3026 BUG_ON(nblocks > journal->j_trans_max);
3027
3028 PROC_INFO_INC(sb, journal.journal_being);
3029 /* set here for journal_join */
3030 th->t_refcount = 1;
3031 th->t_super = sb;
3032
3033relock:
3034 lock_journal(sb);
3035 if (join != JBEGIN_ABORT && reiserfs_is_journal_aborted(journal)) {
3036 unlock_journal(sb);
3037 retval = journal->j_errno;
3038 goto out_fail;
3039 }
3040 journal->j_bcount++;
3041
3042 if (test_bit(J_WRITERS_BLOCKED, &journal->j_state)) {
3043 unlock_journal(sb);
3044 depth = reiserfs_write_unlock_nested(sb);
3045 reiserfs_wait_on_write_block(sb);
3046 reiserfs_write_lock_nested(sb, depth);
3047 PROC_INFO_INC(sb, journal.journal_relock_writers);
3048 goto relock;
3049 }
3050 now = ktime_get_seconds();
3051
3052 /*
3053 * if there is no room in the journal OR
3054 * if this transaction is too old, and we weren't called joinable,
3055 * wait for it to finish before beginning we don't sleep if there
3056 * aren't other writers
3057 */
3058
3059 if ((!join && journal->j_must_wait > 0) ||
3060 (!join
3061 && (journal->j_len_alloc + nblocks + 2) >= journal->j_max_batch)
3062 || (!join && atomic_read(&journal->j_wcount) > 0
3063 && journal->j_trans_start_time > 0
3064 && (now - journal->j_trans_start_time) >
3065 journal->j_max_trans_age) || (!join
3066 && atomic_read(&journal->j_jlock))
3067 || (!join && journal->j_cnode_free < (journal->j_trans_max * 3))) {
3068
3069 old_trans_id = journal->j_trans_id;
3070 /* allow others to finish this transaction */
3071 unlock_journal(sb);
3072
3073 if (!join && (journal->j_len_alloc + nblocks + 2) >=
3074 journal->j_max_batch &&
3075 ((journal->j_len + nblocks + 2) * 100) <
3076 (journal->j_len_alloc * 75)) {
3077 if (atomic_read(&journal->j_wcount) > 10) {
3078 sched_count++;
3079 queue_log_writer(sb);
3080 goto relock;
3081 }
3082 }
3083 /*
3084 * don't mess with joining the transaction if all we
3085 * have to do is wait for someone else to do a commit
3086 */
3087 if (atomic_read(&journal->j_jlock)) {
3088 while (journal->j_trans_id == old_trans_id &&
3089 atomic_read(&journal->j_jlock)) {
3090 queue_log_writer(sb);
3091 }
3092 goto relock;
3093 }
3094 retval = journal_join(&myth, sb);
3095 if (retval)
3096 goto out_fail;
3097
3098 /* someone might have ended the transaction while we joined */
3099 if (old_trans_id != journal->j_trans_id) {
3100 retval = do_journal_end(&myth, 0);
3101 } else {
3102 retval = do_journal_end(&myth, COMMIT_NOW);
3103 }
3104
3105 if (retval)
3106 goto out_fail;
3107
3108 PROC_INFO_INC(sb, journal.journal_relock_wcount);
3109 goto relock;
3110 }
3111 /* we are the first writer, set trans_id */
3112 if (journal->j_trans_start_time == 0) {
3113 journal->j_trans_start_time = ktime_get_seconds();
3114 }
3115 atomic_inc(&journal->j_wcount);
3116 journal->j_len_alloc += nblocks;
3117 th->t_blocks_logged = 0;
3118 th->t_blocks_allocated = nblocks;
3119 th->t_trans_id = journal->j_trans_id;
3120 unlock_journal(sb);
3121 INIT_LIST_HEAD(&th->t_list);
3122 return 0;
3123
3124out_fail:
3125 memset(th, 0, sizeof(*th));
3126 /*
3127 * Re-set th->t_super, so we can properly keep track of how many
3128 * persistent transactions there are. We need to do this so if this
3129 * call is part of a failed restart_transaction, we can free it later
3130 */
3131 th->t_super = sb;
3132 return retval;
3133}
3134
3135struct reiserfs_transaction_handle *reiserfs_persistent_transaction(struct
3136 super_block
3137 *s,
3138 int nblocks)
3139{
3140 int ret;
3141 struct reiserfs_transaction_handle *th;
3142
3143 /*
3144 * if we're nesting into an existing transaction. It will be
3145 * persistent on its own
3146 */
3147 if (reiserfs_transaction_running(s)) {
3148 th = current->journal_info;
3149 th->t_refcount++;
3150 BUG_ON(th->t_refcount < 2);
3151
3152 return th;
3153 }
3154 th = kmalloc(sizeof(struct reiserfs_transaction_handle), GFP_NOFS);
3155 if (!th)
3156 return NULL;
3157 ret = journal_begin(th, s, nblocks);
3158 if (ret) {
3159 kfree(th);
3160 return NULL;
3161 }
3162
3163 SB_JOURNAL(s)->j_persistent_trans++;
3164 return th;
3165}
3166
3167int reiserfs_end_persistent_transaction(struct reiserfs_transaction_handle *th)
3168{
3169 struct super_block *s = th->t_super;
3170 int ret = 0;
3171 if (th->t_trans_id)
3172 ret = journal_end(th);
3173 else
3174 ret = -EIO;
3175 if (th->t_refcount == 0) {
3176 SB_JOURNAL(s)->j_persistent_trans--;
3177 kfree(th);
3178 }
3179 return ret;
3180}
3181
3182static int journal_join(struct reiserfs_transaction_handle *th,
3183 struct super_block *sb)
3184{
3185 struct reiserfs_transaction_handle *cur_th = current->journal_info;
3186
3187 /*
3188 * this keeps do_journal_end from NULLing out the
3189 * current->journal_info pointer
3190 */
3191 th->t_handle_save = cur_th;
3192 BUG_ON(cur_th && cur_th->t_refcount > 1);
3193 return do_journal_begin_r(th, sb, 1, JBEGIN_JOIN);
3194}
3195
3196int journal_join_abort(struct reiserfs_transaction_handle *th,
3197 struct super_block *sb)
3198{
3199 struct reiserfs_transaction_handle *cur_th = current->journal_info;
3200
3201 /*
3202 * this keeps do_journal_end from NULLing out the
3203 * current->journal_info pointer
3204 */
3205 th->t_handle_save = cur_th;
3206 BUG_ON(cur_th && cur_th->t_refcount > 1);
3207 return do_journal_begin_r(th, sb, 1, JBEGIN_ABORT);
3208}
3209
3210int journal_begin(struct reiserfs_transaction_handle *th,
3211 struct super_block *sb, unsigned long nblocks)
3212{
3213 struct reiserfs_transaction_handle *cur_th = current->journal_info;
3214 int ret;
3215
3216 th->t_handle_save = NULL;
3217 if (cur_th) {
3218 /* we are nesting into the current transaction */
3219 if (cur_th->t_super == sb) {
3220 BUG_ON(!cur_th->t_refcount);
3221 cur_th->t_refcount++;
3222 memcpy(th, cur_th, sizeof(*th));
3223 if (th->t_refcount <= 1)
3224 reiserfs_warning(sb, "reiserfs-2005",
3225 "BAD: refcount <= 1, but "
3226 "journal_info != 0");
3227 return 0;
3228 } else {
3229 /*
3230 * we've ended up with a handle from a different
3231 * filesystem. save it and restore on journal_end.
3232 * This should never really happen...
3233 */
3234 reiserfs_warning(sb, "clm-2100",
3235 "nesting info a different FS");
3236 th->t_handle_save = current->journal_info;
3237 current->journal_info = th;
3238 }
3239 } else {
3240 current->journal_info = th;
3241 }
3242 ret = do_journal_begin_r(th, sb, nblocks, JBEGIN_REG);
3243 BUG_ON(current->journal_info != th);
3244
3245 /*
3246 * I guess this boils down to being the reciprocal of clm-2100 above.
3247 * If do_journal_begin_r fails, we need to put it back, since
3248 * journal_end won't be called to do it. */
3249 if (ret)
3250 current->journal_info = th->t_handle_save;
3251 else
3252 BUG_ON(!th->t_refcount);
3253
3254 return ret;
3255}
3256
3257/*
3258 * puts bh into the current transaction. If it was already there, reorders
3259 * removes the old pointers from the hash, and puts new ones in (to make
3260 * sure replay happen in the right order).
3261 *
3262 * if it was dirty, cleans and files onto the clean list. I can't let it
3263 * be dirty again until the transaction is committed.
3264 *
3265 * if j_len, is bigger than j_len_alloc, it pushes j_len_alloc to 10 + j_len.
3266 */
3267int journal_mark_dirty(struct reiserfs_transaction_handle *th,
3268 struct buffer_head *bh)
3269{
3270 struct super_block *sb = th->t_super;
3271 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3272 struct reiserfs_journal_cnode *cn = NULL;
3273 int count_already_incd = 0;
3274 int prepared = 0;
3275 BUG_ON(!th->t_trans_id);
3276
3277 PROC_INFO_INC(sb, journal.mark_dirty);
3278 if (th->t_trans_id != journal->j_trans_id) {
3279 reiserfs_panic(th->t_super, "journal-1577",
3280 "handle trans id %ld != current trans id %ld",
3281 th->t_trans_id, journal->j_trans_id);
3282 }
3283
3284 prepared = test_clear_buffer_journal_prepared(bh);
3285 clear_buffer_journal_restore_dirty(bh);
3286 /* already in this transaction, we are done */
3287 if (buffer_journaled(bh)) {
3288 PROC_INFO_INC(sb, journal.mark_dirty_already);
3289 return 0;
3290 }
3291
3292 /*
3293 * this must be turned into a panic instead of a warning. We can't
3294 * allow a dirty or journal_dirty or locked buffer to be logged, as
3295 * some changes could get to disk too early. NOT GOOD.
3296 */
3297 if (!prepared || buffer_dirty(bh)) {
3298 reiserfs_warning(sb, "journal-1777",
3299 "buffer %llu bad state "
3300 "%cPREPARED %cLOCKED %cDIRTY %cJDIRTY_WAIT",
3301 (unsigned long long)bh->b_blocknr,
3302 prepared ? ' ' : '!',
3303 buffer_locked(bh) ? ' ' : '!',
3304 buffer_dirty(bh) ? ' ' : '!',
3305 buffer_journal_dirty(bh) ? ' ' : '!');
3306 }
3307
3308 if (atomic_read(&journal->j_wcount) <= 0) {
3309 reiserfs_warning(sb, "journal-1409",
3310 "returning because j_wcount was %d",
3311 atomic_read(&journal->j_wcount));
3312 return 1;
3313 }
3314 /*
3315 * this error means I've screwed up, and we've overflowed
3316 * the transaction. Nothing can be done here, except make the
3317 * FS readonly or panic.
3318 */
3319 if (journal->j_len >= journal->j_trans_max) {
3320 reiserfs_panic(th->t_super, "journal-1413",
3321 "j_len (%lu) is too big",
3322 journal->j_len);
3323 }
3324
3325 if (buffer_journal_dirty(bh)) {
3326 count_already_incd = 1;
3327 PROC_INFO_INC(sb, journal.mark_dirty_notjournal);
3328 clear_buffer_journal_dirty(bh);
3329 }
3330
3331 if (journal->j_len > journal->j_len_alloc) {
3332 journal->j_len_alloc = journal->j_len + JOURNAL_PER_BALANCE_CNT;
3333 }
3334
3335 set_buffer_journaled(bh);
3336
3337 /* now put this guy on the end */
3338 if (!cn) {
3339 cn = get_cnode(sb);
3340 if (!cn) {
3341 reiserfs_panic(sb, "journal-4", "get_cnode failed!");
3342 }
3343
3344 if (th->t_blocks_logged == th->t_blocks_allocated) {
3345 th->t_blocks_allocated += JOURNAL_PER_BALANCE_CNT;
3346 journal->j_len_alloc += JOURNAL_PER_BALANCE_CNT;
3347 }
3348 th->t_blocks_logged++;
3349 journal->j_len++;
3350
3351 cn->bh = bh;
3352 cn->blocknr = bh->b_blocknr;
3353 cn->sb = sb;
3354 cn->jlist = NULL;
3355 insert_journal_hash(journal->j_hash_table, cn);
3356 if (!count_already_incd) {
3357 get_bh(bh);
3358 }
3359 }
3360 cn->next = NULL;
3361 cn->prev = journal->j_last;
3362 cn->bh = bh;
3363 if (journal->j_last) {
3364 journal->j_last->next = cn;
3365 journal->j_last = cn;
3366 } else {
3367 journal->j_first = cn;
3368 journal->j_last = cn;
3369 }
3370 reiserfs_schedule_old_flush(sb);
3371 return 0;
3372}
3373
3374int journal_end(struct reiserfs_transaction_handle *th)
3375{
3376 struct super_block *sb = th->t_super;
3377 if (!current->journal_info && th->t_refcount > 1)
3378 reiserfs_warning(sb, "REISER-NESTING",
3379 "th NULL, refcount %d", th->t_refcount);
3380
3381 if (!th->t_trans_id) {
3382 WARN_ON(1);
3383 return -EIO;
3384 }
3385
3386 th->t_refcount--;
3387 if (th->t_refcount > 0) {
3388 struct reiserfs_transaction_handle *cur_th =
3389 current->journal_info;
3390
3391 /*
3392 * we aren't allowed to close a nested transaction on a
3393 * different filesystem from the one in the task struct
3394 */
3395 BUG_ON(cur_th->t_super != th->t_super);
3396
3397 if (th != cur_th) {
3398 memcpy(current->journal_info, th, sizeof(*th));
3399 th->t_trans_id = 0;
3400 }
3401 return 0;
3402 } else {
3403 return do_journal_end(th, 0);
3404 }
3405}
3406
3407/*
3408 * removes from the current transaction, relsing and descrementing any counters.
3409 * also files the removed buffer directly onto the clean list
3410 *
3411 * called by journal_mark_freed when a block has been deleted
3412 *
3413 * returns 1 if it cleaned and relsed the buffer. 0 otherwise
3414 */
3415static int remove_from_transaction(struct super_block *sb,
3416 b_blocknr_t blocknr, int already_cleaned)
3417{
3418 struct buffer_head *bh;
3419 struct reiserfs_journal_cnode *cn;
3420 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3421 int ret = 0;
3422
3423 cn = get_journal_hash_dev(sb, journal->j_hash_table, blocknr);
3424 if (!cn || !cn->bh) {
3425 return ret;
3426 }
3427 bh = cn->bh;
3428 if (cn->prev) {
3429 cn->prev->next = cn->next;
3430 }
3431 if (cn->next) {
3432 cn->next->prev = cn->prev;
3433 }
3434 if (cn == journal->j_first) {
3435 journal->j_first = cn->next;
3436 }
3437 if (cn == journal->j_last) {
3438 journal->j_last = cn->prev;
3439 }
3440 remove_journal_hash(sb, journal->j_hash_table, NULL,
3441 bh->b_blocknr, 0);
3442 clear_buffer_journaled(bh); /* don't log this one */
3443
3444 if (!already_cleaned) {
3445 clear_buffer_journal_dirty(bh);
3446 clear_buffer_dirty(bh);
3447 clear_buffer_journal_test(bh);
3448 put_bh(bh);
3449 if (atomic_read(&bh->b_count) < 0) {
3450 reiserfs_warning(sb, "journal-1752",
3451 "b_count < 0");
3452 }
3453 ret = 1;
3454 }
3455 journal->j_len--;
3456 journal->j_len_alloc--;
3457 free_cnode(sb, cn);
3458 return ret;
3459}
3460
3461/*
3462 * for any cnode in a journal list, it can only be dirtied of all the
3463 * transactions that include it are committed to disk.
3464 * this checks through each transaction, and returns 1 if you are allowed
3465 * to dirty, and 0 if you aren't
3466 *
3467 * it is called by dirty_journal_list, which is called after
3468 * flush_commit_list has gotten all the log blocks for a given
3469 * transaction on disk
3470 *
3471 */
3472static int can_dirty(struct reiserfs_journal_cnode *cn)
3473{
3474 struct super_block *sb = cn->sb;
3475 b_blocknr_t blocknr = cn->blocknr;
3476 struct reiserfs_journal_cnode *cur = cn->hprev;
3477 int can_dirty = 1;
3478
3479 /*
3480 * first test hprev. These are all newer than cn, so any node here
3481 * with the same block number and dev means this node can't be sent
3482 * to disk right now.
3483 */
3484 while (cur && can_dirty) {
3485 if (cur->jlist && cur->bh && cur->blocknr && cur->sb == sb &&
3486 cur->blocknr == blocknr) {
3487 can_dirty = 0;
3488 }
3489 cur = cur->hprev;
3490 }
3491 /*
3492 * then test hnext. These are all older than cn. As long as they
3493 * are committed to the log, it is safe to write cn to disk
3494 */
3495 cur = cn->hnext;
3496 while (cur && can_dirty) {
3497 if (cur->jlist && cur->jlist->j_len > 0 &&
3498 atomic_read(&cur->jlist->j_commit_left) > 0 && cur->bh &&
3499 cur->blocknr && cur->sb == sb && cur->blocknr == blocknr) {
3500 can_dirty = 0;
3501 }
3502 cur = cur->hnext;
3503 }
3504 return can_dirty;
3505}
3506
3507/*
3508 * syncs the commit blocks, but does not force the real buffers to disk
3509 * will wait until the current transaction is done/committed before returning
3510 */
3511int journal_end_sync(struct reiserfs_transaction_handle *th)
3512{
3513 struct super_block *sb = th->t_super;
3514 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3515
3516 BUG_ON(!th->t_trans_id);
3517 /* you can sync while nested, very, very bad */
3518 BUG_ON(th->t_refcount > 1);
3519 if (journal->j_len == 0) {
3520 reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
3521 1);
3522 journal_mark_dirty(th, SB_BUFFER_WITH_SB(sb));
3523 }
3524 return do_journal_end(th, COMMIT_NOW | WAIT);
3525}
3526
3527/* writeback the pending async commits to disk */
3528static void flush_async_commits(struct work_struct *work)
3529{
3530 struct reiserfs_journal *journal =
3531 container_of(work, struct reiserfs_journal, j_work.work);
3532 struct super_block *sb = journal->j_work_sb;
3533 struct reiserfs_journal_list *jl;
3534 struct list_head *entry;
3535
3536 reiserfs_write_lock(sb);
3537 if (!list_empty(&journal->j_journal_list)) {
3538 /* last entry is the youngest, commit it and you get everything */
3539 entry = journal->j_journal_list.prev;
3540 jl = JOURNAL_LIST_ENTRY(entry);
3541 flush_commit_list(sb, jl, 1);
3542 }
3543 reiserfs_write_unlock(sb);
3544}
3545
3546/*
3547 * flushes any old transactions to disk
3548 * ends the current transaction if it is too old
3549 */
3550void reiserfs_flush_old_commits(struct super_block *sb)
3551{
3552 time64_t now;
3553 struct reiserfs_transaction_handle th;
3554 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3555
3556 now = ktime_get_seconds();
3557 /*
3558 * safety check so we don't flush while we are replaying the log during
3559 * mount
3560 */
3561 if (list_empty(&journal->j_journal_list))
3562 return;
3563
3564 /*
3565 * check the current transaction. If there are no writers, and it is
3566 * too old, finish it, and force the commit blocks to disk
3567 */
3568 if (atomic_read(&journal->j_wcount) <= 0 &&
3569 journal->j_trans_start_time > 0 &&
3570 journal->j_len > 0 &&
3571 (now - journal->j_trans_start_time) > journal->j_max_trans_age) {
3572 if (!journal_join(&th, sb)) {
3573 reiserfs_prepare_for_journal(sb,
3574 SB_BUFFER_WITH_SB(sb),
3575 1);
3576 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(sb));
3577
3578 /*
3579 * we're only being called from kreiserfsd, it makes
3580 * no sense to do an async commit so that kreiserfsd
3581 * can do it later
3582 */
3583 do_journal_end(&th, COMMIT_NOW | WAIT);
3584 }
3585 }
3586}
3587
3588/*
3589 * returns 0 if do_journal_end should return right away, returns 1 if
3590 * do_journal_end should finish the commit
3591 *
3592 * if the current transaction is too old, but still has writers, this will
3593 * wait on j_join_wait until all the writers are done. By the time it
3594 * wakes up, the transaction it was called has already ended, so it just
3595 * flushes the commit list and returns 0.
3596 *
3597 * Won't batch when flush or commit_now is set. Also won't batch when
3598 * others are waiting on j_join_wait.
3599 *
3600 * Note, we can't allow the journal_end to proceed while there are still
3601 * writers in the log.
3602 */
3603static int check_journal_end(struct reiserfs_transaction_handle *th, int flags)
3604{
3605
3606 time64_t now;
3607 int flush = flags & FLUSH_ALL;
3608 int commit_now = flags & COMMIT_NOW;
3609 int wait_on_commit = flags & WAIT;
3610 struct reiserfs_journal_list *jl;
3611 struct super_block *sb = th->t_super;
3612 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3613
3614 BUG_ON(!th->t_trans_id);
3615
3616 if (th->t_trans_id != journal->j_trans_id) {
3617 reiserfs_panic(th->t_super, "journal-1577",
3618 "handle trans id %ld != current trans id %ld",
3619 th->t_trans_id, journal->j_trans_id);
3620 }
3621
3622 journal->j_len_alloc -= (th->t_blocks_allocated - th->t_blocks_logged);
3623 /* <= 0 is allowed. unmounting might not call begin */
3624 if (atomic_read(&journal->j_wcount) > 0)
3625 atomic_dec(&journal->j_wcount);
3626
3627 /*
3628 * BUG, deal with case where j_len is 0, but people previously
3629 * freed blocks need to be released will be dealt with by next
3630 * transaction that actually writes something, but should be taken
3631 * care of in this trans
3632 */
3633 BUG_ON(journal->j_len == 0);
3634
3635 /*
3636 * if wcount > 0, and we are called to with flush or commit_now,
3637 * we wait on j_join_wait. We will wake up when the last writer has
3638 * finished the transaction, and started it on its way to the disk.
3639 * Then, we flush the commit or journal list, and just return 0
3640 * because the rest of journal end was already done for this
3641 * transaction.
3642 */
3643 if (atomic_read(&journal->j_wcount) > 0) {
3644 if (flush || commit_now) {
3645 unsigned trans_id;
3646
3647 jl = journal->j_current_jl;
3648 trans_id = jl->j_trans_id;
3649 if (wait_on_commit)
3650 jl->j_state |= LIST_COMMIT_PENDING;
3651 atomic_set(&journal->j_jlock, 1);
3652 if (flush) {
3653 journal->j_next_full_flush = 1;
3654 }
3655 unlock_journal(sb);
3656
3657 /*
3658 * sleep while the current transaction is
3659 * still j_jlocked
3660 */
3661 while (journal->j_trans_id == trans_id) {
3662 if (atomic_read(&journal->j_jlock)) {
3663 queue_log_writer(sb);
3664 } else {
3665 lock_journal(sb);
3666 if (journal->j_trans_id == trans_id) {
3667 atomic_set(&journal->j_jlock,
3668 1);
3669 }
3670 unlock_journal(sb);
3671 }
3672 }
3673 BUG_ON(journal->j_trans_id == trans_id);
3674
3675 if (commit_now
3676 && journal_list_still_alive(sb, trans_id)
3677 && wait_on_commit) {
3678 flush_commit_list(sb, jl, 1);
3679 }
3680 return 0;
3681 }
3682 unlock_journal(sb);
3683 return 0;
3684 }
3685
3686 /* deal with old transactions where we are the last writers */
3687 now = ktime_get_seconds();
3688 if ((now - journal->j_trans_start_time) > journal->j_max_trans_age) {
3689 commit_now = 1;
3690 journal->j_next_async_flush = 1;
3691 }
3692 /* don't batch when someone is waiting on j_join_wait */
3693 /* don't batch when syncing the commit or flushing the whole trans */
3694 if (!(journal->j_must_wait > 0) && !(atomic_read(&journal->j_jlock))
3695 && !flush && !commit_now && (journal->j_len < journal->j_max_batch)
3696 && journal->j_len_alloc < journal->j_max_batch
3697 && journal->j_cnode_free > (journal->j_trans_max * 3)) {
3698 journal->j_bcount++;
3699 unlock_journal(sb);
3700 return 0;
3701 }
3702
3703 if (journal->j_start > SB_ONDISK_JOURNAL_SIZE(sb)) {
3704 reiserfs_panic(sb, "journal-003",
3705 "j_start (%ld) is too high",
3706 journal->j_start);
3707 }
3708 return 1;
3709}
3710
3711/*
3712 * Does all the work that makes deleting blocks safe.
3713 * when deleting a block mark BH_JNew, just remove it from the current
3714 * transaction, clean it's buffer_head and move on.
3715 *
3716 * otherwise:
3717 * set a bit for the block in the journal bitmap. That will prevent it from
3718 * being allocated for unformatted nodes before this transaction has finished.
3719 *
3720 * mark any cnodes for this block as BLOCK_FREED, and clear their bh pointers.
3721 * That will prevent any old transactions with this block from trying to flush
3722 * to the real location. Since we aren't removing the cnode from the
3723 * journal_list_hash, *the block can't be reallocated yet.
3724 *
3725 * Then remove it from the current transaction, decrementing any counters and
3726 * filing it on the clean list.
3727 */
3728int journal_mark_freed(struct reiserfs_transaction_handle *th,
3729 struct super_block *sb, b_blocknr_t blocknr)
3730{
3731 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3732 struct reiserfs_journal_cnode *cn = NULL;
3733 struct buffer_head *bh = NULL;
3734 struct reiserfs_list_bitmap *jb = NULL;
3735 int cleaned = 0;
3736 BUG_ON(!th->t_trans_id);
3737
3738 cn = get_journal_hash_dev(sb, journal->j_hash_table, blocknr);
3739 if (cn && cn->bh) {
3740 bh = cn->bh;
3741 get_bh(bh);
3742 }
3743 /* if it is journal new, we just remove it from this transaction */
3744 if (bh && buffer_journal_new(bh)) {
3745 clear_buffer_journal_new(bh);
3746 clear_prepared_bits(bh);
3747 reiserfs_clean_and_file_buffer(bh);
3748 cleaned = remove_from_transaction(sb, blocknr, cleaned);
3749 } else {
3750 /*
3751 * set the bit for this block in the journal bitmap
3752 * for this transaction
3753 */
3754 jb = journal->j_current_jl->j_list_bitmap;
3755 if (!jb) {
3756 reiserfs_panic(sb, "journal-1702",
3757 "journal_list_bitmap is NULL");
3758 }
3759 set_bit_in_list_bitmap(sb, blocknr, jb);
3760
3761 /* Note, the entire while loop is not allowed to schedule. */
3762
3763 if (bh) {
3764 clear_prepared_bits(bh);
3765 reiserfs_clean_and_file_buffer(bh);
3766 }
3767 cleaned = remove_from_transaction(sb, blocknr, cleaned);
3768
3769 /*
3770 * find all older transactions with this block,
3771 * make sure they don't try to write it out
3772 */
3773 cn = get_journal_hash_dev(sb, journal->j_list_hash_table,
3774 blocknr);
3775 while (cn) {
3776 if (sb == cn->sb && blocknr == cn->blocknr) {
3777 set_bit(BLOCK_FREED, &cn->state);
3778 if (cn->bh) {
3779 /*
3780 * remove_from_transaction will brelse
3781 * the buffer if it was in the current
3782 * trans
3783 */
3784 if (!cleaned) {
3785 clear_buffer_journal_dirty(cn->
3786 bh);
3787 clear_buffer_dirty(cn->bh);
3788 clear_buffer_journal_test(cn->
3789 bh);
3790 cleaned = 1;
3791 put_bh(cn->bh);
3792 if (atomic_read
3793 (&cn->bh->b_count) < 0) {
3794 reiserfs_warning(sb,
3795 "journal-2138",
3796 "cn->bh->b_count < 0");
3797 }
3798 }
3799 /*
3800 * since we are clearing the bh,
3801 * we MUST dec nonzerolen
3802 */
3803 if (cn->jlist) {
3804 atomic_dec(&cn->jlist->
3805 j_nonzerolen);
3806 }
3807 cn->bh = NULL;
3808 }
3809 }
3810 cn = cn->hnext;
3811 }
3812 }
3813
3814 if (bh)
3815 release_buffer_page(bh); /* get_hash grabs the buffer */
3816 return 0;
3817}
3818
3819void reiserfs_update_inode_transaction(struct inode *inode)
3820{
3821 struct reiserfs_journal *journal = SB_JOURNAL(inode->i_sb);
3822 REISERFS_I(inode)->i_jl = journal->j_current_jl;
3823 REISERFS_I(inode)->i_trans_id = journal->j_trans_id;
3824}
3825
3826/*
3827 * returns -1 on error, 0 if no commits/barriers were done and 1
3828 * if a transaction was actually committed and the barrier was done
3829 */
3830static int __commit_trans_jl(struct inode *inode, unsigned long id,
3831 struct reiserfs_journal_list *jl)
3832{
3833 struct reiserfs_transaction_handle th;
3834 struct super_block *sb = inode->i_sb;
3835 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3836 int ret = 0;
3837
3838 /*
3839 * is it from the current transaction,
3840 * or from an unknown transaction?
3841 */
3842 if (id == journal->j_trans_id) {
3843 jl = journal->j_current_jl;
3844 /*
3845 * try to let other writers come in and
3846 * grow this transaction
3847 */
3848 let_transaction_grow(sb, id);
3849 if (journal->j_trans_id != id) {
3850 goto flush_commit_only;
3851 }
3852
3853 ret = journal_begin(&th, sb, 1);
3854 if (ret)
3855 return ret;
3856
3857 /* someone might have ended this transaction while we joined */
3858 if (journal->j_trans_id != id) {
3859 reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
3860 1);
3861 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(sb));
3862 ret = journal_end(&th);
3863 goto flush_commit_only;
3864 }
3865
3866 ret = journal_end_sync(&th);
3867 if (!ret)
3868 ret = 1;
3869
3870 } else {
3871 /*
3872 * this gets tricky, we have to make sure the journal list in
3873 * the inode still exists. We know the list is still around
3874 * if we've got a larger transaction id than the oldest list
3875 */
3876flush_commit_only:
3877 if (journal_list_still_alive(inode->i_sb, id)) {
3878 /*
3879 * we only set ret to 1 when we know for sure
3880 * the barrier hasn't been started yet on the commit
3881 * block.
3882 */
3883 if (atomic_read(&jl->j_commit_left) > 1)
3884 ret = 1;
3885 flush_commit_list(sb, jl, 1);
3886 if (journal->j_errno)
3887 ret = journal->j_errno;
3888 }
3889 }
3890 /* otherwise the list is gone, and long since committed */
3891 return ret;
3892}
3893
3894int reiserfs_commit_for_inode(struct inode *inode)
3895{
3896 unsigned int id = REISERFS_I(inode)->i_trans_id;
3897 struct reiserfs_journal_list *jl = REISERFS_I(inode)->i_jl;
3898
3899 /*
3900 * for the whole inode, assume unset id means it was
3901 * changed in the current transaction. More conservative
3902 */
3903 if (!id || !jl) {
3904 reiserfs_update_inode_transaction(inode);
3905 id = REISERFS_I(inode)->i_trans_id;
3906 /* jl will be updated in __commit_trans_jl */
3907 }
3908
3909 return __commit_trans_jl(inode, id, jl);
3910}
3911
3912void reiserfs_restore_prepared_buffer(struct super_block *sb,
3913 struct buffer_head *bh)
3914{
3915 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3916 PROC_INFO_INC(sb, journal.restore_prepared);
3917 if (!bh) {
3918 return;
3919 }
3920 if (test_clear_buffer_journal_restore_dirty(bh) &&
3921 buffer_journal_dirty(bh)) {
3922 struct reiserfs_journal_cnode *cn;
3923 reiserfs_write_lock(sb);
3924 cn = get_journal_hash_dev(sb,
3925 journal->j_list_hash_table,
3926 bh->b_blocknr);
3927 if (cn && can_dirty(cn)) {
3928 set_buffer_journal_test(bh);
3929 mark_buffer_dirty(bh);
3930 }
3931 reiserfs_write_unlock(sb);
3932 }
3933 clear_buffer_journal_prepared(bh);
3934}
3935
3936extern struct tree_balance *cur_tb;
3937/*
3938 * before we can change a metadata block, we have to make sure it won't
3939 * be written to disk while we are altering it. So, we must:
3940 * clean it
3941 * wait on it.
3942 */
3943int reiserfs_prepare_for_journal(struct super_block *sb,
3944 struct buffer_head *bh, int wait)
3945{
3946 PROC_INFO_INC(sb, journal.prepare);
3947
3948 if (!trylock_buffer(bh)) {
3949 if (!wait)
3950 return 0;
3951 lock_buffer(bh);
3952 }
3953 set_buffer_journal_prepared(bh);
3954 if (test_clear_buffer_dirty(bh) && buffer_journal_dirty(bh)) {
3955 clear_buffer_journal_test(bh);
3956 set_buffer_journal_restore_dirty(bh);
3957 }
3958 unlock_buffer(bh);
3959 return 1;
3960}
3961
3962/*
3963 * long and ugly. If flush, will not return until all commit
3964 * blocks and all real buffers in the trans are on disk.
3965 * If no_async, won't return until all commit blocks are on disk.
3966 *
3967 * keep reading, there are comments as you go along
3968 *
3969 * If the journal is aborted, we just clean up. Things like flushing
3970 * journal lists, etc just won't happen.
3971 */
3972static int do_journal_end(struct reiserfs_transaction_handle *th, int flags)
3973{
3974 struct super_block *sb = th->t_super;
3975 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3976 struct reiserfs_journal_cnode *cn, *next, *jl_cn;
3977 struct reiserfs_journal_cnode *last_cn = NULL;
3978 struct reiserfs_journal_desc *desc;
3979 struct reiserfs_journal_commit *commit;
3980 struct buffer_head *c_bh; /* commit bh */
3981 struct buffer_head *d_bh; /* desc bh */
3982 int cur_write_start = 0; /* start index of current log write */
3983 int i;
3984 int flush;
3985 int wait_on_commit;
3986 struct reiserfs_journal_list *jl, *temp_jl;
3987 struct list_head *entry, *safe;
3988 unsigned long jindex;
3989 unsigned int commit_trans_id;
3990 int trans_half;
3991 int depth;
3992
3993 BUG_ON(th->t_refcount > 1);
3994 BUG_ON(!th->t_trans_id);
3995 BUG_ON(!th->t_super);
3996
3997 /*
3998 * protect flush_older_commits from doing mistakes if the
3999 * transaction ID counter gets overflowed.
4000 */
4001 if (th->t_trans_id == ~0U)
4002 flags |= FLUSH_ALL | COMMIT_NOW | WAIT;
4003 flush = flags & FLUSH_ALL;
4004 wait_on_commit = flags & WAIT;
4005
4006 current->journal_info = th->t_handle_save;
4007 reiserfs_check_lock_depth(sb, "journal end");
4008 if (journal->j_len == 0) {
4009 reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
4010 1);
4011 journal_mark_dirty(th, SB_BUFFER_WITH_SB(sb));
4012 }
4013
4014 lock_journal(sb);
4015 if (journal->j_next_full_flush) {
4016 flags |= FLUSH_ALL;
4017 flush = 1;
4018 }
4019 if (journal->j_next_async_flush) {
4020 flags |= COMMIT_NOW | WAIT;
4021 wait_on_commit = 1;
4022 }
4023
4024 /*
4025 * check_journal_end locks the journal, and unlocks if it does
4026 * not return 1 it tells us if we should continue with the
4027 * journal_end, or just return
4028 */
4029 if (!check_journal_end(th, flags)) {
4030 reiserfs_schedule_old_flush(sb);
4031 wake_queued_writers(sb);
4032 reiserfs_async_progress_wait(sb);
4033 goto out;
4034 }
4035
4036 /* check_journal_end might set these, check again */
4037 if (journal->j_next_full_flush) {
4038 flush = 1;
4039 }
4040
4041 /*
4042 * j must wait means we have to flush the log blocks, and the
4043 * real blocks for this transaction
4044 */
4045 if (journal->j_must_wait > 0) {
4046 flush = 1;
4047 }
4048#ifdef REISERFS_PREALLOCATE
4049 /*
4050 * quota ops might need to nest, setup the journal_info pointer
4051 * for them and raise the refcount so that it is > 0.
4052 */
4053 current->journal_info = th;
4054 th->t_refcount++;
4055
4056 /* it should not involve new blocks into the transaction */
4057 reiserfs_discard_all_prealloc(th);
4058
4059 th->t_refcount--;
4060 current->journal_info = th->t_handle_save;
4061#endif
4062
4063 /* setup description block */
4064 d_bh =
4065 journal_getblk(sb,
4066 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
4067 journal->j_start);
4068 set_buffer_uptodate(d_bh);
4069 desc = (struct reiserfs_journal_desc *)(d_bh)->b_data;
4070 memset(d_bh->b_data, 0, d_bh->b_size);
4071 memcpy(get_journal_desc_magic(d_bh), JOURNAL_DESC_MAGIC, 8);
4072 set_desc_trans_id(desc, journal->j_trans_id);
4073
4074 /*
4075 * setup commit block. Don't write (keep it clean too) this one
4076 * until after everyone else is written
4077 */
4078 c_bh = journal_getblk(sb, SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
4079 ((journal->j_start + journal->j_len +
4080 1) % SB_ONDISK_JOURNAL_SIZE(sb)));
4081 commit = (struct reiserfs_journal_commit *)c_bh->b_data;
4082 memset(c_bh->b_data, 0, c_bh->b_size);
4083 set_commit_trans_id(commit, journal->j_trans_id);
4084 set_buffer_uptodate(c_bh);
4085
4086 /* init this journal list */
4087 jl = journal->j_current_jl;
4088
4089 /*
4090 * we lock the commit before doing anything because
4091 * we want to make sure nobody tries to run flush_commit_list until
4092 * the new transaction is fully setup, and we've already flushed the
4093 * ordered bh list
4094 */
4095 reiserfs_mutex_lock_safe(&jl->j_commit_mutex, sb);
4096
4097 /* save the transaction id in case we need to commit it later */
4098 commit_trans_id = jl->j_trans_id;
4099
4100 atomic_set(&jl->j_older_commits_done, 0);
4101 jl->j_trans_id = journal->j_trans_id;
4102 jl->j_timestamp = journal->j_trans_start_time;
4103 jl->j_commit_bh = c_bh;
4104 jl->j_start = journal->j_start;
4105 jl->j_len = journal->j_len;
4106 atomic_set(&jl->j_nonzerolen, journal->j_len);
4107 atomic_set(&jl->j_commit_left, journal->j_len + 2);
4108 jl->j_realblock = NULL;
4109
4110 /*
4111 * The ENTIRE FOR LOOP MUST not cause schedule to occur.
4112 * for each real block, add it to the journal list hash,
4113 * copy into real block index array in the commit or desc block
4114 */
4115 trans_half = journal_trans_half(sb->s_blocksize);
4116 for (i = 0, cn = journal->j_first; cn; cn = cn->next, i++) {
4117 if (buffer_journaled(cn->bh)) {
4118 jl_cn = get_cnode(sb);
4119 if (!jl_cn) {
4120 reiserfs_panic(sb, "journal-1676",
4121 "get_cnode returned NULL");
4122 }
4123 if (i == 0) {
4124 jl->j_realblock = jl_cn;
4125 }
4126 jl_cn->prev = last_cn;
4127 jl_cn->next = NULL;
4128 if (last_cn) {
4129 last_cn->next = jl_cn;
4130 }
4131 last_cn = jl_cn;
4132 /*
4133 * make sure the block we are trying to log
4134 * is not a block of journal or reserved area
4135 */
4136 if (is_block_in_log_or_reserved_area
4137 (sb, cn->bh->b_blocknr)) {
4138 reiserfs_panic(sb, "journal-2332",
4139 "Trying to log block %lu, "
4140 "which is a log block",
4141 cn->bh->b_blocknr);
4142 }
4143 jl_cn->blocknr = cn->bh->b_blocknr;
4144 jl_cn->state = 0;
4145 jl_cn->sb = sb;
4146 jl_cn->bh = cn->bh;
4147 jl_cn->jlist = jl;
4148 insert_journal_hash(journal->j_list_hash_table, jl_cn);
4149 if (i < trans_half) {
4150 desc->j_realblock[i] =
4151 cpu_to_le32(cn->bh->b_blocknr);
4152 } else {
4153 commit->j_realblock[i - trans_half] =
4154 cpu_to_le32(cn->bh->b_blocknr);
4155 }
4156 } else {
4157 i--;
4158 }
4159 }
4160 set_desc_trans_len(desc, journal->j_len);
4161 set_desc_mount_id(desc, journal->j_mount_id);
4162 set_desc_trans_id(desc, journal->j_trans_id);
4163 set_commit_trans_len(commit, journal->j_len);
4164
4165 /*
4166 * special check in case all buffers in the journal
4167 * were marked for not logging
4168 */
4169 BUG_ON(journal->j_len == 0);
4170
4171 /*
4172 * we're about to dirty all the log blocks, mark the description block
4173 * dirty now too. Don't mark the commit block dirty until all the
4174 * others are on disk
4175 */
4176 mark_buffer_dirty(d_bh);
4177
4178 /*
4179 * first data block is j_start + 1, so add one to
4180 * cur_write_start wherever you use it
4181 */
4182 cur_write_start = journal->j_start;
4183 cn = journal->j_first;
4184 jindex = 1; /* start at one so we don't get the desc again */
4185 while (cn) {
4186 clear_buffer_journal_new(cn->bh);
4187 /* copy all the real blocks into log area. dirty log blocks */
4188 if (buffer_journaled(cn->bh)) {
4189 struct buffer_head *tmp_bh;
4190 char *addr;
4191 struct page *page;
4192 tmp_bh =
4193 journal_getblk(sb,
4194 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
4195 ((cur_write_start +
4196 jindex) %
4197 SB_ONDISK_JOURNAL_SIZE(sb)));
4198 set_buffer_uptodate(tmp_bh);
4199 page = cn->bh->b_page;
4200 addr = kmap(page);
4201 memcpy(tmp_bh->b_data,
4202 addr + offset_in_page(cn->bh->b_data),
4203 cn->bh->b_size);
4204 kunmap(page);
4205 mark_buffer_dirty(tmp_bh);
4206 jindex++;
4207 set_buffer_journal_dirty(cn->bh);
4208 clear_buffer_journaled(cn->bh);
4209 } else {
4210 /*
4211 * JDirty cleared sometime during transaction.
4212 * don't log this one
4213 */
4214 reiserfs_warning(sb, "journal-2048",
4215 "BAD, buffer in journal hash, "
4216 "but not JDirty!");
4217 brelse(cn->bh);
4218 }
4219 next = cn->next;
4220 free_cnode(sb, cn);
4221 cn = next;
4222 reiserfs_cond_resched(sb);
4223 }
4224
4225 /*
4226 * we are done with both the c_bh and d_bh, but
4227 * c_bh must be written after all other commit blocks,
4228 * so we dirty/relse c_bh in flush_commit_list, with commit_left <= 1.
4229 */
4230
4231 journal->j_current_jl = alloc_journal_list(sb);
4232
4233 /* now it is safe to insert this transaction on the main list */
4234 list_add_tail(&jl->j_list, &journal->j_journal_list);
4235 list_add_tail(&jl->j_working_list, &journal->j_working_list);
4236 journal->j_num_work_lists++;
4237
4238 /* reset journal values for the next transaction */
4239 journal->j_start =
4240 (journal->j_start + journal->j_len +
4241 2) % SB_ONDISK_JOURNAL_SIZE(sb);
4242 atomic_set(&journal->j_wcount, 0);
4243 journal->j_bcount = 0;
4244 journal->j_last = NULL;
4245 journal->j_first = NULL;
4246 journal->j_len = 0;
4247 journal->j_trans_start_time = 0;
4248 /* check for trans_id overflow */
4249 if (++journal->j_trans_id == 0)
4250 journal->j_trans_id = 10;
4251 journal->j_current_jl->j_trans_id = journal->j_trans_id;
4252 journal->j_must_wait = 0;
4253 journal->j_len_alloc = 0;
4254 journal->j_next_full_flush = 0;
4255 journal->j_next_async_flush = 0;
4256 init_journal_hash(sb);
4257
4258 /*
4259 * make sure reiserfs_add_jh sees the new current_jl before we
4260 * write out the tails
4261 */
4262 smp_mb();
4263
4264 /*
4265 * tail conversion targets have to hit the disk before we end the
4266 * transaction. Otherwise a later transaction might repack the tail
4267 * before this transaction commits, leaving the data block unflushed
4268 * and clean, if we crash before the later transaction commits, the
4269 * data block is lost.
4270 */
4271 if (!list_empty(&jl->j_tail_bh_list)) {
4272 depth = reiserfs_write_unlock_nested(sb);
4273 write_ordered_buffers(&journal->j_dirty_buffers_lock,
4274 journal, jl, &jl->j_tail_bh_list);
4275 reiserfs_write_lock_nested(sb, depth);
4276 }
4277 BUG_ON(!list_empty(&jl->j_tail_bh_list));
4278 mutex_unlock(&jl->j_commit_mutex);
4279
4280 /*
4281 * honor the flush wishes from the caller, simple commits can
4282 * be done outside the journal lock, they are done below
4283 *
4284 * if we don't flush the commit list right now, we put it into
4285 * the work queue so the people waiting on the async progress work
4286 * queue don't wait for this proc to flush journal lists and such.
4287 */
4288 if (flush) {
4289 flush_commit_list(sb, jl, 1);
4290 flush_journal_list(sb, jl, 1);
4291 } else if (!(jl->j_state & LIST_COMMIT_PENDING)) {
4292 /*
4293 * Avoid queueing work when sb is being shut down. Transaction
4294 * will be flushed on journal shutdown.
4295 */
4296 if (sb->s_flags & SB_ACTIVE)
4297 queue_delayed_work(REISERFS_SB(sb)->commit_wq,
4298 &journal->j_work, HZ / 10);
4299 }
4300
4301 /*
4302 * if the next transaction has any chance of wrapping, flush
4303 * transactions that might get overwritten. If any journal lists
4304 * are very old flush them as well.
4305 */
4306first_jl:
4307 list_for_each_safe(entry, safe, &journal->j_journal_list) {
4308 temp_jl = JOURNAL_LIST_ENTRY(entry);
4309 if (journal->j_start <= temp_jl->j_start) {
4310 if ((journal->j_start + journal->j_trans_max + 1) >=
4311 temp_jl->j_start) {
4312 flush_used_journal_lists(sb, temp_jl);
4313 goto first_jl;
4314 } else if ((journal->j_start +
4315 journal->j_trans_max + 1) <
4316 SB_ONDISK_JOURNAL_SIZE(sb)) {
4317 /*
4318 * if we don't cross into the next
4319 * transaction and we don't wrap, there is
4320 * no way we can overlap any later transactions
4321 * break now
4322 */
4323 break;
4324 }
4325 } else if ((journal->j_start +
4326 journal->j_trans_max + 1) >
4327 SB_ONDISK_JOURNAL_SIZE(sb)) {
4328 if (((journal->j_start + journal->j_trans_max + 1) %
4329 SB_ONDISK_JOURNAL_SIZE(sb)) >=
4330 temp_jl->j_start) {
4331 flush_used_journal_lists(sb, temp_jl);
4332 goto first_jl;
4333 } else {
4334 /*
4335 * we don't overlap anything from out start
4336 * to the end of the log, and our wrapped
4337 * portion doesn't overlap anything at
4338 * the start of the log. We can break
4339 */
4340 break;
4341 }
4342 }
4343 }
4344
4345 journal->j_current_jl->j_list_bitmap =
4346 get_list_bitmap(sb, journal->j_current_jl);
4347
4348 if (!(journal->j_current_jl->j_list_bitmap)) {
4349 reiserfs_panic(sb, "journal-1996",
4350 "could not get a list bitmap");
4351 }
4352
4353 atomic_set(&journal->j_jlock, 0);
4354 unlock_journal(sb);
4355 /* wake up any body waiting to join. */
4356 clear_bit(J_WRITERS_QUEUED, &journal->j_state);
4357 wake_up(&journal->j_join_wait);
4358
4359 if (!flush && wait_on_commit &&
4360 journal_list_still_alive(sb, commit_trans_id)) {
4361 flush_commit_list(sb, jl, 1);
4362 }
4363out:
4364 reiserfs_check_lock_depth(sb, "journal end2");
4365
4366 memset(th, 0, sizeof(*th));
4367 /*
4368 * Re-set th->t_super, so we can properly keep track of how many
4369 * persistent transactions there are. We need to do this so if this
4370 * call is part of a failed restart_transaction, we can free it later
4371 */
4372 th->t_super = sb;
4373
4374 return journal->j_errno;
4375}
4376
4377/* Send the file system read only and refuse new transactions */
4378void reiserfs_abort_journal(struct super_block *sb, int errno)
4379{
4380 struct reiserfs_journal *journal = SB_JOURNAL(sb);
4381 if (test_bit(J_ABORTED, &journal->j_state))
4382 return;
4383
4384 if (!journal->j_errno)
4385 journal->j_errno = errno;
4386
4387 sb->s_flags |= SB_RDONLY;
4388 set_bit(J_ABORTED, &journal->j_state);
4389
4390#ifdef CONFIG_REISERFS_CHECK
4391 dump_stack();
4392#endif
4393}