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1/*
2** Write ahead logging implementation copyright Chris Mason 2000
3**
4** The background commits make this code very interrelated, and
5** overly complex. I need to rethink things a bit....The major players:
6**
7** journal_begin -- call with the number of blocks you expect to log.
8** If the current transaction is too
9** old, it will block until the current transaction is
10** finished, and then start a new one.
11** Usually, your transaction will get joined in with
12** previous ones for speed.
13**
14** journal_join -- same as journal_begin, but won't block on the current
15** transaction regardless of age. Don't ever call
16** this. Ever. There are only two places it should be
17** called from, and they are both inside this file.
18**
19** journal_mark_dirty -- adds blocks into this transaction. clears any flags
20** that might make them get sent to disk
21** and then marks them BH_JDirty. Puts the buffer head
22** into the current transaction hash.
23**
24** journal_end -- if the current transaction is batchable, it does nothing
25** otherwise, it could do an async/synchronous commit, or
26** a full flush of all log and real blocks in the
27** transaction.
28**
29** flush_old_commits -- if the current transaction is too old, it is ended and
30** commit blocks are sent to disk. Forces commit blocks
31** to disk for all backgrounded commits that have been
32** around too long.
33** -- Note, if you call this as an immediate flush from
34** from within kupdate, it will ignore the immediate flag
35*/
36
37#include <linux/time.h>
38#include <linux/semaphore.h>
39#include <linux/vmalloc.h>
40#include "reiserfs.h"
41#include <linux/kernel.h>
42#include <linux/errno.h>
43#include <linux/fcntl.h>
44#include <linux/stat.h>
45#include <linux/string.h>
46#include <linux/buffer_head.h>
47#include <linux/workqueue.h>
48#include <linux/writeback.h>
49#include <linux/blkdev.h>
50#include <linux/backing-dev.h>
51#include <linux/uaccess.h>
52#include <linux/slab.h>
53
54
55/* gets a struct reiserfs_journal_list * from a list head */
56#define JOURNAL_LIST_ENTRY(h) (list_entry((h), struct reiserfs_journal_list, \
57 j_list))
58#define JOURNAL_WORK_ENTRY(h) (list_entry((h), struct reiserfs_journal_list, \
59 j_working_list))
60
61/* the number of mounted filesystems. This is used to decide when to
62** start and kill the commit workqueue
63*/
64static int reiserfs_mounted_fs_count;
65
66static struct workqueue_struct *commit_wq;
67
68#define JOURNAL_TRANS_HALF 1018 /* must be correct to keep the desc and commit
69 structs at 4k */
70#define BUFNR 64 /*read ahead */
71
72/* cnode stat bits. Move these into reiserfs_fs.h */
73
74#define BLOCK_FREED 2 /* this block was freed, and can't be written. */
75#define BLOCK_FREED_HOLDER 3 /* this block was freed during this transaction, and can't be written */
76
77#define BLOCK_NEEDS_FLUSH 4 /* used in flush_journal_list */
78#define BLOCK_DIRTIED 5
79
80/* journal list state bits */
81#define LIST_TOUCHED 1
82#define LIST_DIRTY 2
83#define LIST_COMMIT_PENDING 4 /* someone will commit this list */
84
85/* flags for do_journal_end */
86#define FLUSH_ALL 1 /* flush commit and real blocks */
87#define COMMIT_NOW 2 /* end and commit this transaction */
88#define WAIT 4 /* wait for the log blocks to hit the disk */
89
90static int do_journal_end(struct reiserfs_transaction_handle *,
91 struct super_block *, unsigned long nblocks,
92 int flags);
93static int flush_journal_list(struct super_block *s,
94 struct reiserfs_journal_list *jl, int flushall);
95static int flush_commit_list(struct super_block *s,
96 struct reiserfs_journal_list *jl, int flushall);
97static int can_dirty(struct reiserfs_journal_cnode *cn);
98static int journal_join(struct reiserfs_transaction_handle *th,
99 struct super_block *sb, unsigned long nblocks);
100static int release_journal_dev(struct super_block *super,
101 struct reiserfs_journal *journal);
102static int dirty_one_transaction(struct super_block *s,
103 struct reiserfs_journal_list *jl);
104static void flush_async_commits(struct work_struct *work);
105static void queue_log_writer(struct super_block *s);
106
107/* values for join in do_journal_begin_r */
108enum {
109 JBEGIN_REG = 0, /* regular journal begin */
110 JBEGIN_JOIN = 1, /* join the running transaction if at all possible */
111 JBEGIN_ABORT = 2, /* called from cleanup code, ignores aborted flag */
112};
113
114static int do_journal_begin_r(struct reiserfs_transaction_handle *th,
115 struct super_block *sb,
116 unsigned long nblocks, int join);
117
118static void init_journal_hash(struct super_block *sb)
119{
120 struct reiserfs_journal *journal = SB_JOURNAL(sb);
121 memset(journal->j_hash_table, 0,
122 JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *));
123}
124
125/*
126** clears BH_Dirty and sticks the buffer on the clean list. Called because I can't allow refile_buffer to
127** make schedule happen after I've freed a block. Look at remove_from_transaction and journal_mark_freed for
128** more details.
129*/
130static int reiserfs_clean_and_file_buffer(struct buffer_head *bh)
131{
132 if (bh) {
133 clear_buffer_dirty(bh);
134 clear_buffer_journal_test(bh);
135 }
136 return 0;
137}
138
139static struct reiserfs_bitmap_node *allocate_bitmap_node(struct super_block
140 *sb)
141{
142 struct reiserfs_bitmap_node *bn;
143 static int id;
144
145 bn = kmalloc(sizeof(struct reiserfs_bitmap_node), GFP_NOFS);
146 if (!bn) {
147 return NULL;
148 }
149 bn->data = kzalloc(sb->s_blocksize, GFP_NOFS);
150 if (!bn->data) {
151 kfree(bn);
152 return NULL;
153 }
154 bn->id = id++;
155 INIT_LIST_HEAD(&bn->list);
156 return bn;
157}
158
159static struct reiserfs_bitmap_node *get_bitmap_node(struct super_block *sb)
160{
161 struct reiserfs_journal *journal = SB_JOURNAL(sb);
162 struct reiserfs_bitmap_node *bn = NULL;
163 struct list_head *entry = journal->j_bitmap_nodes.next;
164
165 journal->j_used_bitmap_nodes++;
166 repeat:
167
168 if (entry != &journal->j_bitmap_nodes) {
169 bn = list_entry(entry, struct reiserfs_bitmap_node, list);
170 list_del(entry);
171 memset(bn->data, 0, sb->s_blocksize);
172 journal->j_free_bitmap_nodes--;
173 return bn;
174 }
175 bn = allocate_bitmap_node(sb);
176 if (!bn) {
177 yield();
178 goto repeat;
179 }
180 return bn;
181}
182static inline void free_bitmap_node(struct super_block *sb,
183 struct reiserfs_bitmap_node *bn)
184{
185 struct reiserfs_journal *journal = SB_JOURNAL(sb);
186 journal->j_used_bitmap_nodes--;
187 if (journal->j_free_bitmap_nodes > REISERFS_MAX_BITMAP_NODES) {
188 kfree(bn->data);
189 kfree(bn);
190 } else {
191 list_add(&bn->list, &journal->j_bitmap_nodes);
192 journal->j_free_bitmap_nodes++;
193 }
194}
195
196static void allocate_bitmap_nodes(struct super_block *sb)
197{
198 int i;
199 struct reiserfs_journal *journal = SB_JOURNAL(sb);
200 struct reiserfs_bitmap_node *bn = NULL;
201 for (i = 0; i < REISERFS_MIN_BITMAP_NODES; i++) {
202 bn = allocate_bitmap_node(sb);
203 if (bn) {
204 list_add(&bn->list, &journal->j_bitmap_nodes);
205 journal->j_free_bitmap_nodes++;
206 } else {
207 break; /* this is ok, we'll try again when more are needed */
208 }
209 }
210}
211
212static int set_bit_in_list_bitmap(struct super_block *sb,
213 b_blocknr_t block,
214 struct reiserfs_list_bitmap *jb)
215{
216 unsigned int bmap_nr = block / (sb->s_blocksize << 3);
217 unsigned int bit_nr = block % (sb->s_blocksize << 3);
218
219 if (!jb->bitmaps[bmap_nr]) {
220 jb->bitmaps[bmap_nr] = get_bitmap_node(sb);
221 }
222 set_bit(bit_nr, (unsigned long *)jb->bitmaps[bmap_nr]->data);
223 return 0;
224}
225
226static void cleanup_bitmap_list(struct super_block *sb,
227 struct reiserfs_list_bitmap *jb)
228{
229 int i;
230 if (jb->bitmaps == NULL)
231 return;
232
233 for (i = 0; i < reiserfs_bmap_count(sb); i++) {
234 if (jb->bitmaps[i]) {
235 free_bitmap_node(sb, jb->bitmaps[i]);
236 jb->bitmaps[i] = NULL;
237 }
238 }
239}
240
241/*
242** only call this on FS unmount.
243*/
244static int free_list_bitmaps(struct super_block *sb,
245 struct reiserfs_list_bitmap *jb_array)
246{
247 int i;
248 struct reiserfs_list_bitmap *jb;
249 for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
250 jb = jb_array + i;
251 jb->journal_list = NULL;
252 cleanup_bitmap_list(sb, jb);
253 vfree(jb->bitmaps);
254 jb->bitmaps = NULL;
255 }
256 return 0;
257}
258
259static int free_bitmap_nodes(struct super_block *sb)
260{
261 struct reiserfs_journal *journal = SB_JOURNAL(sb);
262 struct list_head *next = journal->j_bitmap_nodes.next;
263 struct reiserfs_bitmap_node *bn;
264
265 while (next != &journal->j_bitmap_nodes) {
266 bn = list_entry(next, struct reiserfs_bitmap_node, list);
267 list_del(next);
268 kfree(bn->data);
269 kfree(bn);
270 next = journal->j_bitmap_nodes.next;
271 journal->j_free_bitmap_nodes--;
272 }
273
274 return 0;
275}
276
277/*
278** get memory for JOURNAL_NUM_BITMAPS worth of bitmaps.
279** jb_array is the array to be filled in.
280*/
281int reiserfs_allocate_list_bitmaps(struct super_block *sb,
282 struct reiserfs_list_bitmap *jb_array,
283 unsigned int bmap_nr)
284{
285 int i;
286 int failed = 0;
287 struct reiserfs_list_bitmap *jb;
288 int mem = bmap_nr * sizeof(struct reiserfs_bitmap_node *);
289
290 for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
291 jb = jb_array + i;
292 jb->journal_list = NULL;
293 jb->bitmaps = vzalloc(mem);
294 if (!jb->bitmaps) {
295 reiserfs_warning(sb, "clm-2000", "unable to "
296 "allocate bitmaps for journal lists");
297 failed = 1;
298 break;
299 }
300 }
301 if (failed) {
302 free_list_bitmaps(sb, jb_array);
303 return -1;
304 }
305 return 0;
306}
307
308/*
309** find an available list bitmap. If you can't find one, flush a commit list
310** and try again
311*/
312static struct reiserfs_list_bitmap *get_list_bitmap(struct super_block *sb,
313 struct reiserfs_journal_list
314 *jl)
315{
316 int i, j;
317 struct reiserfs_journal *journal = SB_JOURNAL(sb);
318 struct reiserfs_list_bitmap *jb = NULL;
319
320 for (j = 0; j < (JOURNAL_NUM_BITMAPS * 3); j++) {
321 i = journal->j_list_bitmap_index;
322 journal->j_list_bitmap_index = (i + 1) % JOURNAL_NUM_BITMAPS;
323 jb = journal->j_list_bitmap + i;
324 if (journal->j_list_bitmap[i].journal_list) {
325 flush_commit_list(sb,
326 journal->j_list_bitmap[i].
327 journal_list, 1);
328 if (!journal->j_list_bitmap[i].journal_list) {
329 break;
330 }
331 } else {
332 break;
333 }
334 }
335 if (jb->journal_list) { /* double check to make sure if flushed correctly */
336 return NULL;
337 }
338 jb->journal_list = jl;
339 return jb;
340}
341
342/*
343** allocates a new chunk of X nodes, and links them all together as a list.
344** Uses the cnode->next and cnode->prev pointers
345** returns NULL on failure
346*/
347static struct reiserfs_journal_cnode *allocate_cnodes(int num_cnodes)
348{
349 struct reiserfs_journal_cnode *head;
350 int i;
351 if (num_cnodes <= 0) {
352 return NULL;
353 }
354 head = vzalloc(num_cnodes * sizeof(struct reiserfs_journal_cnode));
355 if (!head) {
356 return NULL;
357 }
358 head[0].prev = NULL;
359 head[0].next = head + 1;
360 for (i = 1; i < num_cnodes; i++) {
361 head[i].prev = head + (i - 1);
362 head[i].next = head + (i + 1); /* if last one, overwrite it after the if */
363 }
364 head[num_cnodes - 1].next = NULL;
365 return head;
366}
367
368/*
369** pulls a cnode off the free list, or returns NULL on failure
370*/
371static struct reiserfs_journal_cnode *get_cnode(struct super_block *sb)
372{
373 struct reiserfs_journal_cnode *cn;
374 struct reiserfs_journal *journal = SB_JOURNAL(sb);
375
376 reiserfs_check_lock_depth(sb, "get_cnode");
377
378 if (journal->j_cnode_free <= 0) {
379 return NULL;
380 }
381 journal->j_cnode_used++;
382 journal->j_cnode_free--;
383 cn = journal->j_cnode_free_list;
384 if (!cn) {
385 return cn;
386 }
387 if (cn->next) {
388 cn->next->prev = NULL;
389 }
390 journal->j_cnode_free_list = cn->next;
391 memset(cn, 0, sizeof(struct reiserfs_journal_cnode));
392 return cn;
393}
394
395/*
396** returns a cnode to the free list
397*/
398static void free_cnode(struct super_block *sb,
399 struct reiserfs_journal_cnode *cn)
400{
401 struct reiserfs_journal *journal = SB_JOURNAL(sb);
402
403 reiserfs_check_lock_depth(sb, "free_cnode");
404
405 journal->j_cnode_used--;
406 journal->j_cnode_free++;
407 /* memset(cn, 0, sizeof(struct reiserfs_journal_cnode)) ; */
408 cn->next = journal->j_cnode_free_list;
409 if (journal->j_cnode_free_list) {
410 journal->j_cnode_free_list->prev = cn;
411 }
412 cn->prev = NULL; /* not needed with the memset, but I might kill the memset, and forget to do this */
413 journal->j_cnode_free_list = cn;
414}
415
416static void clear_prepared_bits(struct buffer_head *bh)
417{
418 clear_buffer_journal_prepared(bh);
419 clear_buffer_journal_restore_dirty(bh);
420}
421
422/* return a cnode with same dev, block number and size in table, or null if not found */
423static inline struct reiserfs_journal_cnode *get_journal_hash_dev(struct
424 super_block
425 *sb,
426 struct
427 reiserfs_journal_cnode
428 **table,
429 long bl)
430{
431 struct reiserfs_journal_cnode *cn;
432 cn = journal_hash(table, sb, bl);
433 while (cn) {
434 if (cn->blocknr == bl && cn->sb == sb)
435 return cn;
436 cn = cn->hnext;
437 }
438 return (struct reiserfs_journal_cnode *)0;
439}
440
441/*
442** this actually means 'can this block be reallocated yet?'. If you set search_all, a block can only be allocated
443** if it is not in the current transaction, was not freed by the current transaction, and has no chance of ever
444** being overwritten by a replay after crashing.
445**
446** If you don't set search_all, a block can only be allocated if it is not in the current transaction. Since deleting
447** a block removes it from the current transaction, this case should never happen. If you don't set search_all, make
448** sure you never write the block without logging it.
449**
450** next_zero_bit is a suggestion about the next block to try for find_forward.
451** when bl is rejected because it is set in a journal list bitmap, we search
452** for the next zero bit in the bitmap that rejected bl. Then, we return that
453** through next_zero_bit for find_forward to try.
454**
455** Just because we return something in next_zero_bit does not mean we won't
456** reject it on the next call to reiserfs_in_journal
457**
458*/
459int reiserfs_in_journal(struct super_block *sb,
460 unsigned int bmap_nr, int bit_nr, int search_all,
461 b_blocknr_t * next_zero_bit)
462{
463 struct reiserfs_journal *journal = SB_JOURNAL(sb);
464 struct reiserfs_journal_cnode *cn;
465 struct reiserfs_list_bitmap *jb;
466 int i;
467 unsigned long bl;
468
469 *next_zero_bit = 0; /* always start this at zero. */
470
471 PROC_INFO_INC(sb, journal.in_journal);
472 /* If we aren't doing a search_all, this is a metablock, and it will be logged before use.
473 ** if we crash before the transaction that freed it commits, this transaction won't
474 ** have committed either, and the block will never be written
475 */
476 if (search_all) {
477 for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
478 PROC_INFO_INC(sb, journal.in_journal_bitmap);
479 jb = journal->j_list_bitmap + i;
480 if (jb->journal_list && jb->bitmaps[bmap_nr] &&
481 test_bit(bit_nr,
482 (unsigned long *)jb->bitmaps[bmap_nr]->
483 data)) {
484 *next_zero_bit =
485 find_next_zero_bit((unsigned long *)
486 (jb->bitmaps[bmap_nr]->
487 data),
488 sb->s_blocksize << 3,
489 bit_nr + 1);
490 return 1;
491 }
492 }
493 }
494
495 bl = bmap_nr * (sb->s_blocksize << 3) + bit_nr;
496 /* is it in any old transactions? */
497 if (search_all
498 && (cn =
499 get_journal_hash_dev(sb, journal->j_list_hash_table, bl))) {
500 return 1;
501 }
502
503 /* is it in the current transaction. This should never happen */
504 if ((cn = get_journal_hash_dev(sb, journal->j_hash_table, bl))) {
505 BUG();
506 return 1;
507 }
508
509 PROC_INFO_INC(sb, journal.in_journal_reusable);
510 /* safe for reuse */
511 return 0;
512}
513
514/* insert cn into table
515*/
516static inline void insert_journal_hash(struct reiserfs_journal_cnode **table,
517 struct reiserfs_journal_cnode *cn)
518{
519 struct reiserfs_journal_cnode *cn_orig;
520
521 cn_orig = journal_hash(table, cn->sb, cn->blocknr);
522 cn->hnext = cn_orig;
523 cn->hprev = NULL;
524 if (cn_orig) {
525 cn_orig->hprev = cn;
526 }
527 journal_hash(table, cn->sb, cn->blocknr) = cn;
528}
529
530/* lock the current transaction */
531static inline void lock_journal(struct super_block *sb)
532{
533 PROC_INFO_INC(sb, journal.lock_journal);
534
535 reiserfs_mutex_lock_safe(&SB_JOURNAL(sb)->j_mutex, sb);
536}
537
538/* unlock the current transaction */
539static inline void unlock_journal(struct super_block *sb)
540{
541 mutex_unlock(&SB_JOURNAL(sb)->j_mutex);
542}
543
544static inline void get_journal_list(struct reiserfs_journal_list *jl)
545{
546 jl->j_refcount++;
547}
548
549static inline void put_journal_list(struct super_block *s,
550 struct reiserfs_journal_list *jl)
551{
552 if (jl->j_refcount < 1) {
553 reiserfs_panic(s, "journal-2", "trans id %u, refcount at %d",
554 jl->j_trans_id, jl->j_refcount);
555 }
556 if (--jl->j_refcount == 0)
557 kfree(jl);
558}
559
560/*
561** this used to be much more involved, and I'm keeping it just in case things get ugly again.
562** it gets called by flush_commit_list, and cleans up any data stored about blocks freed during a
563** transaction.
564*/
565static void cleanup_freed_for_journal_list(struct super_block *sb,
566 struct reiserfs_journal_list *jl)
567{
568
569 struct reiserfs_list_bitmap *jb = jl->j_list_bitmap;
570 if (jb) {
571 cleanup_bitmap_list(sb, jb);
572 }
573 jl->j_list_bitmap->journal_list = NULL;
574 jl->j_list_bitmap = NULL;
575}
576
577static int journal_list_still_alive(struct super_block *s,
578 unsigned int trans_id)
579{
580 struct reiserfs_journal *journal = SB_JOURNAL(s);
581 struct list_head *entry = &journal->j_journal_list;
582 struct reiserfs_journal_list *jl;
583
584 if (!list_empty(entry)) {
585 jl = JOURNAL_LIST_ENTRY(entry->next);
586 if (jl->j_trans_id <= trans_id) {
587 return 1;
588 }
589 }
590 return 0;
591}
592
593/*
594 * If page->mapping was null, we failed to truncate this page for
595 * some reason. Most likely because it was truncated after being
596 * logged via data=journal.
597 *
598 * This does a check to see if the buffer belongs to one of these
599 * lost pages before doing the final put_bh. If page->mapping was
600 * null, it tries to free buffers on the page, which should make the
601 * final page_cache_release drop the page from the lru.
602 */
603static void release_buffer_page(struct buffer_head *bh)
604{
605 struct page *page = bh->b_page;
606 if (!page->mapping && trylock_page(page)) {
607 page_cache_get(page);
608 put_bh(bh);
609 if (!page->mapping)
610 try_to_free_buffers(page);
611 unlock_page(page);
612 page_cache_release(page);
613 } else {
614 put_bh(bh);
615 }
616}
617
618static void reiserfs_end_buffer_io_sync(struct buffer_head *bh, int uptodate)
619{
620 char b[BDEVNAME_SIZE];
621
622 if (buffer_journaled(bh)) {
623 reiserfs_warning(NULL, "clm-2084",
624 "pinned buffer %lu:%s sent to disk",
625 bh->b_blocknr, bdevname(bh->b_bdev, b));
626 }
627 if (uptodate)
628 set_buffer_uptodate(bh);
629 else
630 clear_buffer_uptodate(bh);
631
632 unlock_buffer(bh);
633 release_buffer_page(bh);
634}
635
636static void reiserfs_end_ordered_io(struct buffer_head *bh, int uptodate)
637{
638 if (uptodate)
639 set_buffer_uptodate(bh);
640 else
641 clear_buffer_uptodate(bh);
642 unlock_buffer(bh);
643 put_bh(bh);
644}
645
646static void submit_logged_buffer(struct buffer_head *bh)
647{
648 get_bh(bh);
649 bh->b_end_io = reiserfs_end_buffer_io_sync;
650 clear_buffer_journal_new(bh);
651 clear_buffer_dirty(bh);
652 if (!test_clear_buffer_journal_test(bh))
653 BUG();
654 if (!buffer_uptodate(bh))
655 BUG();
656 submit_bh(WRITE, bh);
657}
658
659static void submit_ordered_buffer(struct buffer_head *bh)
660{
661 get_bh(bh);
662 bh->b_end_io = reiserfs_end_ordered_io;
663 clear_buffer_dirty(bh);
664 if (!buffer_uptodate(bh))
665 BUG();
666 submit_bh(WRITE, bh);
667}
668
669#define CHUNK_SIZE 32
670struct buffer_chunk {
671 struct buffer_head *bh[CHUNK_SIZE];
672 int nr;
673};
674
675static void write_chunk(struct buffer_chunk *chunk)
676{
677 int i;
678 for (i = 0; i < chunk->nr; i++) {
679 submit_logged_buffer(chunk->bh[i]);
680 }
681 chunk->nr = 0;
682}
683
684static void write_ordered_chunk(struct buffer_chunk *chunk)
685{
686 int i;
687 for (i = 0; i < chunk->nr; i++) {
688 submit_ordered_buffer(chunk->bh[i]);
689 }
690 chunk->nr = 0;
691}
692
693static int add_to_chunk(struct buffer_chunk *chunk, struct buffer_head *bh,
694 spinlock_t * lock, void (fn) (struct buffer_chunk *))
695{
696 int ret = 0;
697 BUG_ON(chunk->nr >= CHUNK_SIZE);
698 chunk->bh[chunk->nr++] = bh;
699 if (chunk->nr >= CHUNK_SIZE) {
700 ret = 1;
701 if (lock)
702 spin_unlock(lock);
703 fn(chunk);
704 if (lock)
705 spin_lock(lock);
706 }
707 return ret;
708}
709
710static atomic_t nr_reiserfs_jh = ATOMIC_INIT(0);
711static struct reiserfs_jh *alloc_jh(void)
712{
713 struct reiserfs_jh *jh;
714 while (1) {
715 jh = kmalloc(sizeof(*jh), GFP_NOFS);
716 if (jh) {
717 atomic_inc(&nr_reiserfs_jh);
718 return jh;
719 }
720 yield();
721 }
722}
723
724/*
725 * we want to free the jh when the buffer has been written
726 * and waited on
727 */
728void reiserfs_free_jh(struct buffer_head *bh)
729{
730 struct reiserfs_jh *jh;
731
732 jh = bh->b_private;
733 if (jh) {
734 bh->b_private = NULL;
735 jh->bh = NULL;
736 list_del_init(&jh->list);
737 kfree(jh);
738 if (atomic_read(&nr_reiserfs_jh) <= 0)
739 BUG();
740 atomic_dec(&nr_reiserfs_jh);
741 put_bh(bh);
742 }
743}
744
745static inline int __add_jh(struct reiserfs_journal *j, struct buffer_head *bh,
746 int tail)
747{
748 struct reiserfs_jh *jh;
749
750 if (bh->b_private) {
751 spin_lock(&j->j_dirty_buffers_lock);
752 if (!bh->b_private) {
753 spin_unlock(&j->j_dirty_buffers_lock);
754 goto no_jh;
755 }
756 jh = bh->b_private;
757 list_del_init(&jh->list);
758 } else {
759 no_jh:
760 get_bh(bh);
761 jh = alloc_jh();
762 spin_lock(&j->j_dirty_buffers_lock);
763 /* buffer must be locked for __add_jh, should be able to have
764 * two adds at the same time
765 */
766 BUG_ON(bh->b_private);
767 jh->bh = bh;
768 bh->b_private = jh;
769 }
770 jh->jl = j->j_current_jl;
771 if (tail)
772 list_add_tail(&jh->list, &jh->jl->j_tail_bh_list);
773 else {
774 list_add_tail(&jh->list, &jh->jl->j_bh_list);
775 }
776 spin_unlock(&j->j_dirty_buffers_lock);
777 return 0;
778}
779
780int reiserfs_add_tail_list(struct inode *inode, struct buffer_head *bh)
781{
782 return __add_jh(SB_JOURNAL(inode->i_sb), bh, 1);
783}
784int reiserfs_add_ordered_list(struct inode *inode, struct buffer_head *bh)
785{
786 return __add_jh(SB_JOURNAL(inode->i_sb), bh, 0);
787}
788
789#define JH_ENTRY(l) list_entry((l), struct reiserfs_jh, list)
790static int write_ordered_buffers(spinlock_t * lock,
791 struct reiserfs_journal *j,
792 struct reiserfs_journal_list *jl,
793 struct list_head *list)
794{
795 struct buffer_head *bh;
796 struct reiserfs_jh *jh;
797 int ret = j->j_errno;
798 struct buffer_chunk chunk;
799 struct list_head tmp;
800 INIT_LIST_HEAD(&tmp);
801
802 chunk.nr = 0;
803 spin_lock(lock);
804 while (!list_empty(list)) {
805 jh = JH_ENTRY(list->next);
806 bh = jh->bh;
807 get_bh(bh);
808 if (!trylock_buffer(bh)) {
809 if (!buffer_dirty(bh)) {
810 list_move(&jh->list, &tmp);
811 goto loop_next;
812 }
813 spin_unlock(lock);
814 if (chunk.nr)
815 write_ordered_chunk(&chunk);
816 wait_on_buffer(bh);
817 cond_resched();
818 spin_lock(lock);
819 goto loop_next;
820 }
821 /* in theory, dirty non-uptodate buffers should never get here,
822 * but the upper layer io error paths still have a few quirks.
823 * Handle them here as gracefully as we can
824 */
825 if (!buffer_uptodate(bh) && buffer_dirty(bh)) {
826 clear_buffer_dirty(bh);
827 ret = -EIO;
828 }
829 if (buffer_dirty(bh)) {
830 list_move(&jh->list, &tmp);
831 add_to_chunk(&chunk, bh, lock, write_ordered_chunk);
832 } else {
833 reiserfs_free_jh(bh);
834 unlock_buffer(bh);
835 }
836 loop_next:
837 put_bh(bh);
838 cond_resched_lock(lock);
839 }
840 if (chunk.nr) {
841 spin_unlock(lock);
842 write_ordered_chunk(&chunk);
843 spin_lock(lock);
844 }
845 while (!list_empty(&tmp)) {
846 jh = JH_ENTRY(tmp.prev);
847 bh = jh->bh;
848 get_bh(bh);
849 reiserfs_free_jh(bh);
850
851 if (buffer_locked(bh)) {
852 spin_unlock(lock);
853 wait_on_buffer(bh);
854 spin_lock(lock);
855 }
856 if (!buffer_uptodate(bh)) {
857 ret = -EIO;
858 }
859 /* ugly interaction with invalidatepage here.
860 * reiserfs_invalidate_page will pin any buffer that has a valid
861 * journal head from an older transaction. If someone else sets
862 * our buffer dirty after we write it in the first loop, and
863 * then someone truncates the page away, nobody will ever write
864 * the buffer. We're safe if we write the page one last time
865 * after freeing the journal header.
866 */
867 if (buffer_dirty(bh) && unlikely(bh->b_page->mapping == NULL)) {
868 spin_unlock(lock);
869 ll_rw_block(WRITE, 1, &bh);
870 spin_lock(lock);
871 }
872 put_bh(bh);
873 cond_resched_lock(lock);
874 }
875 spin_unlock(lock);
876 return ret;
877}
878
879static int flush_older_commits(struct super_block *s,
880 struct reiserfs_journal_list *jl)
881{
882 struct reiserfs_journal *journal = SB_JOURNAL(s);
883 struct reiserfs_journal_list *other_jl;
884 struct reiserfs_journal_list *first_jl;
885 struct list_head *entry;
886 unsigned int trans_id = jl->j_trans_id;
887 unsigned int other_trans_id;
888 unsigned int first_trans_id;
889
890 find_first:
891 /*
892 * first we walk backwards to find the oldest uncommitted transation
893 */
894 first_jl = jl;
895 entry = jl->j_list.prev;
896 while (1) {
897 other_jl = JOURNAL_LIST_ENTRY(entry);
898 if (entry == &journal->j_journal_list ||
899 atomic_read(&other_jl->j_older_commits_done))
900 break;
901
902 first_jl = other_jl;
903 entry = other_jl->j_list.prev;
904 }
905
906 /* if we didn't find any older uncommitted transactions, return now */
907 if (first_jl == jl) {
908 return 0;
909 }
910
911 first_trans_id = first_jl->j_trans_id;
912
913 entry = &first_jl->j_list;
914 while (1) {
915 other_jl = JOURNAL_LIST_ENTRY(entry);
916 other_trans_id = other_jl->j_trans_id;
917
918 if (other_trans_id < trans_id) {
919 if (atomic_read(&other_jl->j_commit_left) != 0) {
920 flush_commit_list(s, other_jl, 0);
921
922 /* list we were called with is gone, return */
923 if (!journal_list_still_alive(s, trans_id))
924 return 1;
925
926 /* the one we just flushed is gone, this means all
927 * older lists are also gone, so first_jl is no longer
928 * valid either. Go back to the beginning.
929 */
930 if (!journal_list_still_alive
931 (s, other_trans_id)) {
932 goto find_first;
933 }
934 }
935 entry = entry->next;
936 if (entry == &journal->j_journal_list)
937 return 0;
938 } else {
939 return 0;
940 }
941 }
942 return 0;
943}
944
945static int reiserfs_async_progress_wait(struct super_block *s)
946{
947 struct reiserfs_journal *j = SB_JOURNAL(s);
948
949 if (atomic_read(&j->j_async_throttle)) {
950 reiserfs_write_unlock(s);
951 congestion_wait(BLK_RW_ASYNC, HZ / 10);
952 reiserfs_write_lock(s);
953 }
954
955 return 0;
956}
957
958/*
959** if this journal list still has commit blocks unflushed, send them to disk.
960**
961** log areas must be flushed in order (transaction 2 can't commit before transaction 1)
962** Before the commit block can by written, every other log block must be safely on disk
963**
964*/
965static int flush_commit_list(struct super_block *s,
966 struct reiserfs_journal_list *jl, int flushall)
967{
968 int i;
969 b_blocknr_t bn;
970 struct buffer_head *tbh = NULL;
971 unsigned int trans_id = jl->j_trans_id;
972 struct reiserfs_journal *journal = SB_JOURNAL(s);
973 int retval = 0;
974 int write_len;
975
976 reiserfs_check_lock_depth(s, "flush_commit_list");
977
978 if (atomic_read(&jl->j_older_commits_done)) {
979 return 0;
980 }
981
982 /* before we can put our commit blocks on disk, we have to make sure everyone older than
983 ** us is on disk too
984 */
985 BUG_ON(jl->j_len <= 0);
986 BUG_ON(trans_id == journal->j_trans_id);
987
988 get_journal_list(jl);
989 if (flushall) {
990 if (flush_older_commits(s, jl) == 1) {
991 /* list disappeared during flush_older_commits. return */
992 goto put_jl;
993 }
994 }
995
996 /* make sure nobody is trying to flush this one at the same time */
997 reiserfs_mutex_lock_safe(&jl->j_commit_mutex, s);
998
999 if (!journal_list_still_alive(s, trans_id)) {
1000 mutex_unlock(&jl->j_commit_mutex);
1001 goto put_jl;
1002 }
1003 BUG_ON(jl->j_trans_id == 0);
1004
1005 /* this commit is done, exit */
1006 if (atomic_read(&(jl->j_commit_left)) <= 0) {
1007 if (flushall) {
1008 atomic_set(&(jl->j_older_commits_done), 1);
1009 }
1010 mutex_unlock(&jl->j_commit_mutex);
1011 goto put_jl;
1012 }
1013
1014 if (!list_empty(&jl->j_bh_list)) {
1015 int ret;
1016
1017 /*
1018 * We might sleep in numerous places inside
1019 * write_ordered_buffers. Relax the write lock.
1020 */
1021 reiserfs_write_unlock(s);
1022 ret = write_ordered_buffers(&journal->j_dirty_buffers_lock,
1023 journal, jl, &jl->j_bh_list);
1024 if (ret < 0 && retval == 0)
1025 retval = ret;
1026 reiserfs_write_lock(s);
1027 }
1028 BUG_ON(!list_empty(&jl->j_bh_list));
1029 /*
1030 * for the description block and all the log blocks, submit any buffers
1031 * that haven't already reached the disk. Try to write at least 256
1032 * log blocks. later on, we will only wait on blocks that correspond
1033 * to this transaction, but while we're unplugging we might as well
1034 * get a chunk of data on there.
1035 */
1036 atomic_inc(&journal->j_async_throttle);
1037 write_len = jl->j_len + 1;
1038 if (write_len < 256)
1039 write_len = 256;
1040 for (i = 0 ; i < write_len ; i++) {
1041 bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) + (jl->j_start + i) %
1042 SB_ONDISK_JOURNAL_SIZE(s);
1043 tbh = journal_find_get_block(s, bn);
1044 if (tbh) {
1045 if (buffer_dirty(tbh)) {
1046 reiserfs_write_unlock(s);
1047 ll_rw_block(WRITE, 1, &tbh);
1048 reiserfs_write_lock(s);
1049 }
1050 put_bh(tbh) ;
1051 }
1052 }
1053 atomic_dec(&journal->j_async_throttle);
1054
1055 for (i = 0; i < (jl->j_len + 1); i++) {
1056 bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) +
1057 (jl->j_start + i) % SB_ONDISK_JOURNAL_SIZE(s);
1058 tbh = journal_find_get_block(s, bn);
1059
1060 reiserfs_write_unlock(s);
1061 wait_on_buffer(tbh);
1062 reiserfs_write_lock(s);
1063 // since we're using ll_rw_blk above, it might have skipped over
1064 // a locked buffer. Double check here
1065 //
1066 /* redundant, sync_dirty_buffer() checks */
1067 if (buffer_dirty(tbh)) {
1068 reiserfs_write_unlock(s);
1069 sync_dirty_buffer(tbh);
1070 reiserfs_write_lock(s);
1071 }
1072 if (unlikely(!buffer_uptodate(tbh))) {
1073#ifdef CONFIG_REISERFS_CHECK
1074 reiserfs_warning(s, "journal-601",
1075 "buffer write failed");
1076#endif
1077 retval = -EIO;
1078 }
1079 put_bh(tbh); /* once for journal_find_get_block */
1080 put_bh(tbh); /* once due to original getblk in do_journal_end */
1081 atomic_dec(&(jl->j_commit_left));
1082 }
1083
1084 BUG_ON(atomic_read(&(jl->j_commit_left)) != 1);
1085
1086 /* If there was a write error in the journal - we can't commit
1087 * this transaction - it will be invalid and, if successful,
1088 * will just end up propagating the write error out to
1089 * the file system. */
1090 if (likely(!retval && !reiserfs_is_journal_aborted (journal))) {
1091 if (buffer_dirty(jl->j_commit_bh))
1092 BUG();
1093 mark_buffer_dirty(jl->j_commit_bh) ;
1094 reiserfs_write_unlock(s);
1095 if (reiserfs_barrier_flush(s))
1096 __sync_dirty_buffer(jl->j_commit_bh, WRITE_FLUSH_FUA);
1097 else
1098 sync_dirty_buffer(jl->j_commit_bh);
1099 reiserfs_write_lock(s);
1100 }
1101
1102 /* If there was a write error in the journal - we can't commit this
1103 * transaction - it will be invalid and, if successful, will just end
1104 * up propagating the write error out to the filesystem. */
1105 if (unlikely(!buffer_uptodate(jl->j_commit_bh))) {
1106#ifdef CONFIG_REISERFS_CHECK
1107 reiserfs_warning(s, "journal-615", "buffer write failed");
1108#endif
1109 retval = -EIO;
1110 }
1111 bforget(jl->j_commit_bh);
1112 if (journal->j_last_commit_id != 0 &&
1113 (jl->j_trans_id - journal->j_last_commit_id) != 1) {
1114 reiserfs_warning(s, "clm-2200", "last commit %lu, current %lu",
1115 journal->j_last_commit_id, jl->j_trans_id);
1116 }
1117 journal->j_last_commit_id = jl->j_trans_id;
1118
1119 /* now, every commit block is on the disk. It is safe to allow blocks freed during this transaction to be reallocated */
1120 cleanup_freed_for_journal_list(s, jl);
1121
1122 retval = retval ? retval : journal->j_errno;
1123
1124 /* mark the metadata dirty */
1125 if (!retval)
1126 dirty_one_transaction(s, jl);
1127 atomic_dec(&(jl->j_commit_left));
1128
1129 if (flushall) {
1130 atomic_set(&(jl->j_older_commits_done), 1);
1131 }
1132 mutex_unlock(&jl->j_commit_mutex);
1133 put_jl:
1134 put_journal_list(s, jl);
1135
1136 if (retval)
1137 reiserfs_abort(s, retval, "Journal write error in %s",
1138 __func__);
1139 return retval;
1140}
1141
1142/*
1143** flush_journal_list frequently needs to find a newer transaction for a given block. This does that, or
1144** returns NULL if it can't find anything
1145*/
1146static struct reiserfs_journal_list *find_newer_jl_for_cn(struct
1147 reiserfs_journal_cnode
1148 *cn)
1149{
1150 struct super_block *sb = cn->sb;
1151 b_blocknr_t blocknr = cn->blocknr;
1152
1153 cn = cn->hprev;
1154 while (cn) {
1155 if (cn->sb == sb && cn->blocknr == blocknr && cn->jlist) {
1156 return cn->jlist;
1157 }
1158 cn = cn->hprev;
1159 }
1160 return NULL;
1161}
1162
1163static int newer_jl_done(struct reiserfs_journal_cnode *cn)
1164{
1165 struct super_block *sb = cn->sb;
1166 b_blocknr_t blocknr = cn->blocknr;
1167
1168 cn = cn->hprev;
1169 while (cn) {
1170 if (cn->sb == sb && cn->blocknr == blocknr && cn->jlist &&
1171 atomic_read(&cn->jlist->j_commit_left) != 0)
1172 return 0;
1173 cn = cn->hprev;
1174 }
1175 return 1;
1176}
1177
1178static void remove_journal_hash(struct super_block *,
1179 struct reiserfs_journal_cnode **,
1180 struct reiserfs_journal_list *, unsigned long,
1181 int);
1182
1183/*
1184** once all the real blocks have been flushed, it is safe to remove them from the
1185** journal list for this transaction. Aside from freeing the cnode, this also allows the
1186** block to be reallocated for data blocks if it had been deleted.
1187*/
1188static void remove_all_from_journal_list(struct super_block *sb,
1189 struct reiserfs_journal_list *jl,
1190 int debug)
1191{
1192 struct reiserfs_journal *journal = SB_JOURNAL(sb);
1193 struct reiserfs_journal_cnode *cn, *last;
1194 cn = jl->j_realblock;
1195
1196 /* which is better, to lock once around the whole loop, or
1197 ** to lock for each call to remove_journal_hash?
1198 */
1199 while (cn) {
1200 if (cn->blocknr != 0) {
1201 if (debug) {
1202 reiserfs_warning(sb, "reiserfs-2201",
1203 "block %u, bh is %d, state %ld",
1204 cn->blocknr, cn->bh ? 1 : 0,
1205 cn->state);
1206 }
1207 cn->state = 0;
1208 remove_journal_hash(sb, journal->j_list_hash_table,
1209 jl, cn->blocknr, 1);
1210 }
1211 last = cn;
1212 cn = cn->next;
1213 free_cnode(sb, last);
1214 }
1215 jl->j_realblock = NULL;
1216}
1217
1218/*
1219** if this timestamp is greater than the timestamp we wrote last to the header block, write it to the header block.
1220** once this is done, I can safely say the log area for this transaction won't ever be replayed, and I can start
1221** releasing blocks in this transaction for reuse as data blocks.
1222** called by flush_journal_list, before it calls remove_all_from_journal_list
1223**
1224*/
1225static int _update_journal_header_block(struct super_block *sb,
1226 unsigned long offset,
1227 unsigned int trans_id)
1228{
1229 struct reiserfs_journal_header *jh;
1230 struct reiserfs_journal *journal = SB_JOURNAL(sb);
1231
1232 if (reiserfs_is_journal_aborted(journal))
1233 return -EIO;
1234
1235 if (trans_id >= journal->j_last_flush_trans_id) {
1236 if (buffer_locked((journal->j_header_bh))) {
1237 reiserfs_write_unlock(sb);
1238 wait_on_buffer((journal->j_header_bh));
1239 reiserfs_write_lock(sb);
1240 if (unlikely(!buffer_uptodate(journal->j_header_bh))) {
1241#ifdef CONFIG_REISERFS_CHECK
1242 reiserfs_warning(sb, "journal-699",
1243 "buffer write failed");
1244#endif
1245 return -EIO;
1246 }
1247 }
1248 journal->j_last_flush_trans_id = trans_id;
1249 journal->j_first_unflushed_offset = offset;
1250 jh = (struct reiserfs_journal_header *)(journal->j_header_bh->
1251 b_data);
1252 jh->j_last_flush_trans_id = cpu_to_le32(trans_id);
1253 jh->j_first_unflushed_offset = cpu_to_le32(offset);
1254 jh->j_mount_id = cpu_to_le32(journal->j_mount_id);
1255
1256 set_buffer_dirty(journal->j_header_bh);
1257 reiserfs_write_unlock(sb);
1258
1259 if (reiserfs_barrier_flush(sb))
1260 __sync_dirty_buffer(journal->j_header_bh, WRITE_FLUSH_FUA);
1261 else
1262 sync_dirty_buffer(journal->j_header_bh);
1263
1264 reiserfs_write_lock(sb);
1265 if (!buffer_uptodate(journal->j_header_bh)) {
1266 reiserfs_warning(sb, "journal-837",
1267 "IO error during journal replay");
1268 return -EIO;
1269 }
1270 }
1271 return 0;
1272}
1273
1274static int update_journal_header_block(struct super_block *sb,
1275 unsigned long offset,
1276 unsigned int trans_id)
1277{
1278 return _update_journal_header_block(sb, offset, trans_id);
1279}
1280
1281/*
1282** flush any and all journal lists older than you are
1283** can only be called from flush_journal_list
1284*/
1285static int flush_older_journal_lists(struct super_block *sb,
1286 struct reiserfs_journal_list *jl)
1287{
1288 struct list_head *entry;
1289 struct reiserfs_journal_list *other_jl;
1290 struct reiserfs_journal *journal = SB_JOURNAL(sb);
1291 unsigned int trans_id = jl->j_trans_id;
1292
1293 /* we know we are the only ones flushing things, no extra race
1294 * protection is required.
1295 */
1296 restart:
1297 entry = journal->j_journal_list.next;
1298 /* Did we wrap? */
1299 if (entry == &journal->j_journal_list)
1300 return 0;
1301 other_jl = JOURNAL_LIST_ENTRY(entry);
1302 if (other_jl->j_trans_id < trans_id) {
1303 BUG_ON(other_jl->j_refcount <= 0);
1304 /* do not flush all */
1305 flush_journal_list(sb, other_jl, 0);
1306
1307 /* other_jl is now deleted from the list */
1308 goto restart;
1309 }
1310 return 0;
1311}
1312
1313static void del_from_work_list(struct super_block *s,
1314 struct reiserfs_journal_list *jl)
1315{
1316 struct reiserfs_journal *journal = SB_JOURNAL(s);
1317 if (!list_empty(&jl->j_working_list)) {
1318 list_del_init(&jl->j_working_list);
1319 journal->j_num_work_lists--;
1320 }
1321}
1322
1323/* flush a journal list, both commit and real blocks
1324**
1325** always set flushall to 1, unless you are calling from inside
1326** flush_journal_list
1327**
1328** IMPORTANT. This can only be called while there are no journal writers,
1329** and the journal is locked. That means it can only be called from
1330** do_journal_end, or by journal_release
1331*/
1332static int flush_journal_list(struct super_block *s,
1333 struct reiserfs_journal_list *jl, int flushall)
1334{
1335 struct reiserfs_journal_list *pjl;
1336 struct reiserfs_journal_cnode *cn, *last;
1337 int count;
1338 int was_jwait = 0;
1339 int was_dirty = 0;
1340 struct buffer_head *saved_bh;
1341 unsigned long j_len_saved = jl->j_len;
1342 struct reiserfs_journal *journal = SB_JOURNAL(s);
1343 int err = 0;
1344
1345 BUG_ON(j_len_saved <= 0);
1346
1347 if (atomic_read(&journal->j_wcount) != 0) {
1348 reiserfs_warning(s, "clm-2048", "called with wcount %d",
1349 atomic_read(&journal->j_wcount));
1350 }
1351 BUG_ON(jl->j_trans_id == 0);
1352
1353 /* if flushall == 0, the lock is already held */
1354 if (flushall) {
1355 reiserfs_mutex_lock_safe(&journal->j_flush_mutex, s);
1356 } else if (mutex_trylock(&journal->j_flush_mutex)) {
1357 BUG();
1358 }
1359
1360 count = 0;
1361 if (j_len_saved > journal->j_trans_max) {
1362 reiserfs_panic(s, "journal-715", "length is %lu, trans id %lu",
1363 j_len_saved, jl->j_trans_id);
1364 return 0;
1365 }
1366
1367 /* if all the work is already done, get out of here */
1368 if (atomic_read(&(jl->j_nonzerolen)) <= 0 &&
1369 atomic_read(&(jl->j_commit_left)) <= 0) {
1370 goto flush_older_and_return;
1371 }
1372
1373 /* start by putting the commit list on disk. This will also flush
1374 ** the commit lists of any olders transactions
1375 */
1376 flush_commit_list(s, jl, 1);
1377
1378 if (!(jl->j_state & LIST_DIRTY)
1379 && !reiserfs_is_journal_aborted(journal))
1380 BUG();
1381
1382 /* are we done now? */
1383 if (atomic_read(&(jl->j_nonzerolen)) <= 0 &&
1384 atomic_read(&(jl->j_commit_left)) <= 0) {
1385 goto flush_older_and_return;
1386 }
1387
1388 /* loop through each cnode, see if we need to write it,
1389 ** or wait on a more recent transaction, or just ignore it
1390 */
1391 if (atomic_read(&(journal->j_wcount)) != 0) {
1392 reiserfs_panic(s, "journal-844", "journal list is flushing, "
1393 "wcount is not 0");
1394 }
1395 cn = jl->j_realblock;
1396 while (cn) {
1397 was_jwait = 0;
1398 was_dirty = 0;
1399 saved_bh = NULL;
1400 /* blocknr of 0 is no longer in the hash, ignore it */
1401 if (cn->blocknr == 0) {
1402 goto free_cnode;
1403 }
1404
1405 /* This transaction failed commit. Don't write out to the disk */
1406 if (!(jl->j_state & LIST_DIRTY))
1407 goto free_cnode;
1408
1409 pjl = find_newer_jl_for_cn(cn);
1410 /* the order is important here. We check pjl to make sure we
1411 ** don't clear BH_JDirty_wait if we aren't the one writing this
1412 ** block to disk
1413 */
1414 if (!pjl && cn->bh) {
1415 saved_bh = cn->bh;
1416
1417 /* we do this to make sure nobody releases the buffer while
1418 ** we are working with it
1419 */
1420 get_bh(saved_bh);
1421
1422 if (buffer_journal_dirty(saved_bh)) {
1423 BUG_ON(!can_dirty(cn));
1424 was_jwait = 1;
1425 was_dirty = 1;
1426 } else if (can_dirty(cn)) {
1427 /* everything with !pjl && jwait should be writable */
1428 BUG();
1429 }
1430 }
1431
1432 /* if someone has this block in a newer transaction, just make
1433 ** sure they are committed, and don't try writing it to disk
1434 */
1435 if (pjl) {
1436 if (atomic_read(&pjl->j_commit_left))
1437 flush_commit_list(s, pjl, 1);
1438 goto free_cnode;
1439 }
1440
1441 /* bh == NULL when the block got to disk on its own, OR,
1442 ** the block got freed in a future transaction
1443 */
1444 if (saved_bh == NULL) {
1445 goto free_cnode;
1446 }
1447
1448 /* this should never happen. kupdate_one_transaction has this list
1449 ** locked while it works, so we should never see a buffer here that
1450 ** is not marked JDirty_wait
1451 */
1452 if ((!was_jwait) && !buffer_locked(saved_bh)) {
1453 reiserfs_warning(s, "journal-813",
1454 "BAD! buffer %llu %cdirty %cjwait, "
1455 "not in a newer tranasction",
1456 (unsigned long long)saved_bh->
1457 b_blocknr, was_dirty ? ' ' : '!',
1458 was_jwait ? ' ' : '!');
1459 }
1460 if (was_dirty) {
1461 /* we inc again because saved_bh gets decremented at free_cnode */
1462 get_bh(saved_bh);
1463 set_bit(BLOCK_NEEDS_FLUSH, &cn->state);
1464 lock_buffer(saved_bh);
1465 BUG_ON(cn->blocknr != saved_bh->b_blocknr);
1466 if (buffer_dirty(saved_bh))
1467 submit_logged_buffer(saved_bh);
1468 else
1469 unlock_buffer(saved_bh);
1470 count++;
1471 } else {
1472 reiserfs_warning(s, "clm-2082",
1473 "Unable to flush buffer %llu in %s",
1474 (unsigned long long)saved_bh->
1475 b_blocknr, __func__);
1476 }
1477 free_cnode:
1478 last = cn;
1479 cn = cn->next;
1480 if (saved_bh) {
1481 /* we incremented this to keep others from taking the buffer head away */
1482 put_bh(saved_bh);
1483 if (atomic_read(&(saved_bh->b_count)) < 0) {
1484 reiserfs_warning(s, "journal-945",
1485 "saved_bh->b_count < 0");
1486 }
1487 }
1488 }
1489 if (count > 0) {
1490 cn = jl->j_realblock;
1491 while (cn) {
1492 if (test_bit(BLOCK_NEEDS_FLUSH, &cn->state)) {
1493 if (!cn->bh) {
1494 reiserfs_panic(s, "journal-1011",
1495 "cn->bh is NULL");
1496 }
1497
1498 reiserfs_write_unlock(s);
1499 wait_on_buffer(cn->bh);
1500 reiserfs_write_lock(s);
1501
1502 if (!cn->bh) {
1503 reiserfs_panic(s, "journal-1012",
1504 "cn->bh is NULL");
1505 }
1506 if (unlikely(!buffer_uptodate(cn->bh))) {
1507#ifdef CONFIG_REISERFS_CHECK
1508 reiserfs_warning(s, "journal-949",
1509 "buffer write failed");
1510#endif
1511 err = -EIO;
1512 }
1513 /* note, we must clear the JDirty_wait bit after the up to date
1514 ** check, otherwise we race against our flushpage routine
1515 */
1516 BUG_ON(!test_clear_buffer_journal_dirty
1517 (cn->bh));
1518
1519 /* drop one ref for us */
1520 put_bh(cn->bh);
1521 /* drop one ref for journal_mark_dirty */
1522 release_buffer_page(cn->bh);
1523 }
1524 cn = cn->next;
1525 }
1526 }
1527
1528 if (err)
1529 reiserfs_abort(s, -EIO,
1530 "Write error while pushing transaction to disk in %s",
1531 __func__);
1532 flush_older_and_return:
1533
1534 /* before we can update the journal header block, we _must_ flush all
1535 ** real blocks from all older transactions to disk. This is because
1536 ** once the header block is updated, this transaction will not be
1537 ** replayed after a crash
1538 */
1539 if (flushall) {
1540 flush_older_journal_lists(s, jl);
1541 }
1542
1543 err = journal->j_errno;
1544 /* before we can remove everything from the hash tables for this
1545 ** transaction, we must make sure it can never be replayed
1546 **
1547 ** since we are only called from do_journal_end, we know for sure there
1548 ** are no allocations going on while we are flushing journal lists. So,
1549 ** we only need to update the journal header block for the last list
1550 ** being flushed
1551 */
1552 if (!err && flushall) {
1553 err =
1554 update_journal_header_block(s,
1555 (jl->j_start + jl->j_len +
1556 2) % SB_ONDISK_JOURNAL_SIZE(s),
1557 jl->j_trans_id);
1558 if (err)
1559 reiserfs_abort(s, -EIO,
1560 "Write error while updating journal header in %s",
1561 __func__);
1562 }
1563 remove_all_from_journal_list(s, jl, 0);
1564 list_del_init(&jl->j_list);
1565 journal->j_num_lists--;
1566 del_from_work_list(s, jl);
1567
1568 if (journal->j_last_flush_id != 0 &&
1569 (jl->j_trans_id - journal->j_last_flush_id) != 1) {
1570 reiserfs_warning(s, "clm-2201", "last flush %lu, current %lu",
1571 journal->j_last_flush_id, jl->j_trans_id);
1572 }
1573 journal->j_last_flush_id = jl->j_trans_id;
1574
1575 /* not strictly required since we are freeing the list, but it should
1576 * help find code using dead lists later on
1577 */
1578 jl->j_len = 0;
1579 atomic_set(&(jl->j_nonzerolen), 0);
1580 jl->j_start = 0;
1581 jl->j_realblock = NULL;
1582 jl->j_commit_bh = NULL;
1583 jl->j_trans_id = 0;
1584 jl->j_state = 0;
1585 put_journal_list(s, jl);
1586 if (flushall)
1587 mutex_unlock(&journal->j_flush_mutex);
1588 return err;
1589}
1590
1591static int test_transaction(struct super_block *s,
1592 struct reiserfs_journal_list *jl)
1593{
1594 struct reiserfs_journal_cnode *cn;
1595
1596 if (jl->j_len == 0 || atomic_read(&jl->j_nonzerolen) == 0)
1597 return 1;
1598
1599 cn = jl->j_realblock;
1600 while (cn) {
1601 /* if the blocknr == 0, this has been cleared from the hash,
1602 ** skip it
1603 */
1604 if (cn->blocknr == 0) {
1605 goto next;
1606 }
1607 if (cn->bh && !newer_jl_done(cn))
1608 return 0;
1609 next:
1610 cn = cn->next;
1611 cond_resched();
1612 }
1613 return 0;
1614}
1615
1616static int write_one_transaction(struct super_block *s,
1617 struct reiserfs_journal_list *jl,
1618 struct buffer_chunk *chunk)
1619{
1620 struct reiserfs_journal_cnode *cn;
1621 int ret = 0;
1622
1623 jl->j_state |= LIST_TOUCHED;
1624 del_from_work_list(s, jl);
1625 if (jl->j_len == 0 || atomic_read(&jl->j_nonzerolen) == 0) {
1626 return 0;
1627 }
1628
1629 cn = jl->j_realblock;
1630 while (cn) {
1631 /* if the blocknr == 0, this has been cleared from the hash,
1632 ** skip it
1633 */
1634 if (cn->blocknr == 0) {
1635 goto next;
1636 }
1637 if (cn->bh && can_dirty(cn) && buffer_dirty(cn->bh)) {
1638 struct buffer_head *tmp_bh;
1639 /* we can race against journal_mark_freed when we try
1640 * to lock_buffer(cn->bh), so we have to inc the buffer
1641 * count, and recheck things after locking
1642 */
1643 tmp_bh = cn->bh;
1644 get_bh(tmp_bh);
1645 lock_buffer(tmp_bh);
1646 if (cn->bh && can_dirty(cn) && buffer_dirty(tmp_bh)) {
1647 if (!buffer_journal_dirty(tmp_bh) ||
1648 buffer_journal_prepared(tmp_bh))
1649 BUG();
1650 add_to_chunk(chunk, tmp_bh, NULL, write_chunk);
1651 ret++;
1652 } else {
1653 /* note, cn->bh might be null now */
1654 unlock_buffer(tmp_bh);
1655 }
1656 put_bh(tmp_bh);
1657 }
1658 next:
1659 cn = cn->next;
1660 cond_resched();
1661 }
1662 return ret;
1663}
1664
1665/* used by flush_commit_list */
1666static int dirty_one_transaction(struct super_block *s,
1667 struct reiserfs_journal_list *jl)
1668{
1669 struct reiserfs_journal_cnode *cn;
1670 struct reiserfs_journal_list *pjl;
1671 int ret = 0;
1672
1673 jl->j_state |= LIST_DIRTY;
1674 cn = jl->j_realblock;
1675 while (cn) {
1676 /* look for a more recent transaction that logged this
1677 ** buffer. Only the most recent transaction with a buffer in
1678 ** it is allowed to send that buffer to disk
1679 */
1680 pjl = find_newer_jl_for_cn(cn);
1681 if (!pjl && cn->blocknr && cn->bh
1682 && buffer_journal_dirty(cn->bh)) {
1683 BUG_ON(!can_dirty(cn));
1684 /* if the buffer is prepared, it will either be logged
1685 * or restored. If restored, we need to make sure
1686 * it actually gets marked dirty
1687 */
1688 clear_buffer_journal_new(cn->bh);
1689 if (buffer_journal_prepared(cn->bh)) {
1690 set_buffer_journal_restore_dirty(cn->bh);
1691 } else {
1692 set_buffer_journal_test(cn->bh);
1693 mark_buffer_dirty(cn->bh);
1694 }
1695 }
1696 cn = cn->next;
1697 }
1698 return ret;
1699}
1700
1701static int kupdate_transactions(struct super_block *s,
1702 struct reiserfs_journal_list *jl,
1703 struct reiserfs_journal_list **next_jl,
1704 unsigned int *next_trans_id,
1705 int num_blocks, int num_trans)
1706{
1707 int ret = 0;
1708 int written = 0;
1709 int transactions_flushed = 0;
1710 unsigned int orig_trans_id = jl->j_trans_id;
1711 struct buffer_chunk chunk;
1712 struct list_head *entry;
1713 struct reiserfs_journal *journal = SB_JOURNAL(s);
1714 chunk.nr = 0;
1715
1716 reiserfs_mutex_lock_safe(&journal->j_flush_mutex, s);
1717 if (!journal_list_still_alive(s, orig_trans_id)) {
1718 goto done;
1719 }
1720
1721 /* we've got j_flush_mutex held, nobody is going to delete any
1722 * of these lists out from underneath us
1723 */
1724 while ((num_trans && transactions_flushed < num_trans) ||
1725 (!num_trans && written < num_blocks)) {
1726
1727 if (jl->j_len == 0 || (jl->j_state & LIST_TOUCHED) ||
1728 atomic_read(&jl->j_commit_left)
1729 || !(jl->j_state & LIST_DIRTY)) {
1730 del_from_work_list(s, jl);
1731 break;
1732 }
1733 ret = write_one_transaction(s, jl, &chunk);
1734
1735 if (ret < 0)
1736 goto done;
1737 transactions_flushed++;
1738 written += ret;
1739 entry = jl->j_list.next;
1740
1741 /* did we wrap? */
1742 if (entry == &journal->j_journal_list) {
1743 break;
1744 }
1745 jl = JOURNAL_LIST_ENTRY(entry);
1746
1747 /* don't bother with older transactions */
1748 if (jl->j_trans_id <= orig_trans_id)
1749 break;
1750 }
1751 if (chunk.nr) {
1752 write_chunk(&chunk);
1753 }
1754
1755 done:
1756 mutex_unlock(&journal->j_flush_mutex);
1757 return ret;
1758}
1759
1760/* for o_sync and fsync heavy applications, they tend to use
1761** all the journa list slots with tiny transactions. These
1762** trigger lots and lots of calls to update the header block, which
1763** adds seeks and slows things down.
1764**
1765** This function tries to clear out a large chunk of the journal lists
1766** at once, which makes everything faster since only the newest journal
1767** list updates the header block
1768*/
1769static int flush_used_journal_lists(struct super_block *s,
1770 struct reiserfs_journal_list *jl)
1771{
1772 unsigned long len = 0;
1773 unsigned long cur_len;
1774 int ret;
1775 int i;
1776 int limit = 256;
1777 struct reiserfs_journal_list *tjl;
1778 struct reiserfs_journal_list *flush_jl;
1779 unsigned int trans_id;
1780 struct reiserfs_journal *journal = SB_JOURNAL(s);
1781
1782 flush_jl = tjl = jl;
1783
1784 /* in data logging mode, try harder to flush a lot of blocks */
1785 if (reiserfs_data_log(s))
1786 limit = 1024;
1787 /* flush for 256 transactions or limit blocks, whichever comes first */
1788 for (i = 0; i < 256 && len < limit; i++) {
1789 if (atomic_read(&tjl->j_commit_left) ||
1790 tjl->j_trans_id < jl->j_trans_id) {
1791 break;
1792 }
1793 cur_len = atomic_read(&tjl->j_nonzerolen);
1794 if (cur_len > 0) {
1795 tjl->j_state &= ~LIST_TOUCHED;
1796 }
1797 len += cur_len;
1798 flush_jl = tjl;
1799 if (tjl->j_list.next == &journal->j_journal_list)
1800 break;
1801 tjl = JOURNAL_LIST_ENTRY(tjl->j_list.next);
1802 }
1803 /* try to find a group of blocks we can flush across all the
1804 ** transactions, but only bother if we've actually spanned
1805 ** across multiple lists
1806 */
1807 if (flush_jl != jl) {
1808 ret = kupdate_transactions(s, jl, &tjl, &trans_id, len, i);
1809 }
1810 flush_journal_list(s, flush_jl, 1);
1811 return 0;
1812}
1813
1814/*
1815** removes any nodes in table with name block and dev as bh.
1816** only touchs the hnext and hprev pointers.
1817*/
1818void remove_journal_hash(struct super_block *sb,
1819 struct reiserfs_journal_cnode **table,
1820 struct reiserfs_journal_list *jl,
1821 unsigned long block, int remove_freed)
1822{
1823 struct reiserfs_journal_cnode *cur;
1824 struct reiserfs_journal_cnode **head;
1825
1826 head = &(journal_hash(table, sb, block));
1827 if (!head) {
1828 return;
1829 }
1830 cur = *head;
1831 while (cur) {
1832 if (cur->blocknr == block && cur->sb == sb
1833 && (jl == NULL || jl == cur->jlist)
1834 && (!test_bit(BLOCK_FREED, &cur->state) || remove_freed)) {
1835 if (cur->hnext) {
1836 cur->hnext->hprev = cur->hprev;
1837 }
1838 if (cur->hprev) {
1839 cur->hprev->hnext = cur->hnext;
1840 } else {
1841 *head = cur->hnext;
1842 }
1843 cur->blocknr = 0;
1844 cur->sb = NULL;
1845 cur->state = 0;
1846 if (cur->bh && cur->jlist) /* anybody who clears the cur->bh will also dec the nonzerolen */
1847 atomic_dec(&(cur->jlist->j_nonzerolen));
1848 cur->bh = NULL;
1849 cur->jlist = NULL;
1850 }
1851 cur = cur->hnext;
1852 }
1853}
1854
1855static void free_journal_ram(struct super_block *sb)
1856{
1857 struct reiserfs_journal *journal = SB_JOURNAL(sb);
1858 kfree(journal->j_current_jl);
1859 journal->j_num_lists--;
1860
1861 vfree(journal->j_cnode_free_orig);
1862 free_list_bitmaps(sb, journal->j_list_bitmap);
1863 free_bitmap_nodes(sb); /* must be after free_list_bitmaps */
1864 if (journal->j_header_bh) {
1865 brelse(journal->j_header_bh);
1866 }
1867 /* j_header_bh is on the journal dev, make sure not to release the journal
1868 * dev until we brelse j_header_bh
1869 */
1870 release_journal_dev(sb, journal);
1871 vfree(journal);
1872}
1873
1874/*
1875** call on unmount. Only set error to 1 if you haven't made your way out
1876** of read_super() yet. Any other caller must keep error at 0.
1877*/
1878static int do_journal_release(struct reiserfs_transaction_handle *th,
1879 struct super_block *sb, int error)
1880{
1881 struct reiserfs_transaction_handle myth;
1882 int flushed = 0;
1883 struct reiserfs_journal *journal = SB_JOURNAL(sb);
1884
1885 /* we only want to flush out transactions if we were called with error == 0
1886 */
1887 if (!error && !(sb->s_flags & MS_RDONLY)) {
1888 /* end the current trans */
1889 BUG_ON(!th->t_trans_id);
1890 do_journal_end(th, sb, 10, FLUSH_ALL);
1891
1892 /* make sure something gets logged to force our way into the flush code */
1893 if (!journal_join(&myth, sb, 1)) {
1894 reiserfs_prepare_for_journal(sb,
1895 SB_BUFFER_WITH_SB(sb),
1896 1);
1897 journal_mark_dirty(&myth, sb,
1898 SB_BUFFER_WITH_SB(sb));
1899 do_journal_end(&myth, sb, 1, FLUSH_ALL);
1900 flushed = 1;
1901 }
1902 }
1903
1904 /* this also catches errors during the do_journal_end above */
1905 if (!error && reiserfs_is_journal_aborted(journal)) {
1906 memset(&myth, 0, sizeof(myth));
1907 if (!journal_join_abort(&myth, sb, 1)) {
1908 reiserfs_prepare_for_journal(sb,
1909 SB_BUFFER_WITH_SB(sb),
1910 1);
1911 journal_mark_dirty(&myth, sb,
1912 SB_BUFFER_WITH_SB(sb));
1913 do_journal_end(&myth, sb, 1, FLUSH_ALL);
1914 }
1915 }
1916
1917 reiserfs_mounted_fs_count--;
1918 /* wait for all commits to finish */
1919 cancel_delayed_work(&SB_JOURNAL(sb)->j_work);
1920
1921 /*
1922 * We must release the write lock here because
1923 * the workqueue job (flush_async_commit) needs this lock
1924 */
1925 reiserfs_write_unlock(sb);
1926
1927 cancel_delayed_work_sync(&REISERFS_SB(sb)->old_work);
1928 flush_workqueue(commit_wq);
1929
1930 if (!reiserfs_mounted_fs_count) {
1931 destroy_workqueue(commit_wq);
1932 commit_wq = NULL;
1933 }
1934
1935 free_journal_ram(sb);
1936
1937 reiserfs_write_lock(sb);
1938
1939 return 0;
1940}
1941
1942/*
1943** call on unmount. flush all journal trans, release all alloc'd ram
1944*/
1945int journal_release(struct reiserfs_transaction_handle *th,
1946 struct super_block *sb)
1947{
1948 return do_journal_release(th, sb, 0);
1949}
1950
1951/*
1952** only call from an error condition inside reiserfs_read_super!
1953*/
1954int journal_release_error(struct reiserfs_transaction_handle *th,
1955 struct super_block *sb)
1956{
1957 return do_journal_release(th, sb, 1);
1958}
1959
1960/* compares description block with commit block. returns 1 if they differ, 0 if they are the same */
1961static int journal_compare_desc_commit(struct super_block *sb,
1962 struct reiserfs_journal_desc *desc,
1963 struct reiserfs_journal_commit *commit)
1964{
1965 if (get_commit_trans_id(commit) != get_desc_trans_id(desc) ||
1966 get_commit_trans_len(commit) != get_desc_trans_len(desc) ||
1967 get_commit_trans_len(commit) > SB_JOURNAL(sb)->j_trans_max ||
1968 get_commit_trans_len(commit) <= 0) {
1969 return 1;
1970 }
1971 return 0;
1972}
1973
1974/* returns 0 if it did not find a description block
1975** returns -1 if it found a corrupt commit block
1976** returns 1 if both desc and commit were valid
1977*/
1978static int journal_transaction_is_valid(struct super_block *sb,
1979 struct buffer_head *d_bh,
1980 unsigned int *oldest_invalid_trans_id,
1981 unsigned long *newest_mount_id)
1982{
1983 struct reiserfs_journal_desc *desc;
1984 struct reiserfs_journal_commit *commit;
1985 struct buffer_head *c_bh;
1986 unsigned long offset;
1987
1988 if (!d_bh)
1989 return 0;
1990
1991 desc = (struct reiserfs_journal_desc *)d_bh->b_data;
1992 if (get_desc_trans_len(desc) > 0
1993 && !memcmp(get_journal_desc_magic(d_bh), JOURNAL_DESC_MAGIC, 8)) {
1994 if (oldest_invalid_trans_id && *oldest_invalid_trans_id
1995 && get_desc_trans_id(desc) > *oldest_invalid_trans_id) {
1996 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
1997 "journal-986: transaction "
1998 "is valid returning because trans_id %d is greater than "
1999 "oldest_invalid %lu",
2000 get_desc_trans_id(desc),
2001 *oldest_invalid_trans_id);
2002 return 0;
2003 }
2004 if (newest_mount_id
2005 && *newest_mount_id > get_desc_mount_id(desc)) {
2006 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2007 "journal-1087: transaction "
2008 "is valid returning because mount_id %d is less than "
2009 "newest_mount_id %lu",
2010 get_desc_mount_id(desc),
2011 *newest_mount_id);
2012 return -1;
2013 }
2014 if (get_desc_trans_len(desc) > SB_JOURNAL(sb)->j_trans_max) {
2015 reiserfs_warning(sb, "journal-2018",
2016 "Bad transaction length %d "
2017 "encountered, ignoring transaction",
2018 get_desc_trans_len(desc));
2019 return -1;
2020 }
2021 offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2022
2023 /* ok, we have a journal description block, lets see if the transaction was valid */
2024 c_bh =
2025 journal_bread(sb,
2026 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2027 ((offset + get_desc_trans_len(desc) +
2028 1) % SB_ONDISK_JOURNAL_SIZE(sb)));
2029 if (!c_bh)
2030 return 0;
2031 commit = (struct reiserfs_journal_commit *)c_bh->b_data;
2032 if (journal_compare_desc_commit(sb, desc, commit)) {
2033 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2034 "journal_transaction_is_valid, commit offset %ld had bad "
2035 "time %d or length %d",
2036 c_bh->b_blocknr -
2037 SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2038 get_commit_trans_id(commit),
2039 get_commit_trans_len(commit));
2040 brelse(c_bh);
2041 if (oldest_invalid_trans_id) {
2042 *oldest_invalid_trans_id =
2043 get_desc_trans_id(desc);
2044 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2045 "journal-1004: "
2046 "transaction_is_valid setting oldest invalid trans_id "
2047 "to %d",
2048 get_desc_trans_id(desc));
2049 }
2050 return -1;
2051 }
2052 brelse(c_bh);
2053 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2054 "journal-1006: found valid "
2055 "transaction start offset %llu, len %d id %d",
2056 d_bh->b_blocknr -
2057 SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2058 get_desc_trans_len(desc),
2059 get_desc_trans_id(desc));
2060 return 1;
2061 } else {
2062 return 0;
2063 }
2064}
2065
2066static void brelse_array(struct buffer_head **heads, int num)
2067{
2068 int i;
2069 for (i = 0; i < num; i++) {
2070 brelse(heads[i]);
2071 }
2072}
2073
2074/*
2075** given the start, and values for the oldest acceptable transactions,
2076** this either reads in a replays a transaction, or returns because the transaction
2077** is invalid, or too old.
2078*/
2079static int journal_read_transaction(struct super_block *sb,
2080 unsigned long cur_dblock,
2081 unsigned long oldest_start,
2082 unsigned int oldest_trans_id,
2083 unsigned long newest_mount_id)
2084{
2085 struct reiserfs_journal *journal = SB_JOURNAL(sb);
2086 struct reiserfs_journal_desc *desc;
2087 struct reiserfs_journal_commit *commit;
2088 unsigned int trans_id = 0;
2089 struct buffer_head *c_bh;
2090 struct buffer_head *d_bh;
2091 struct buffer_head **log_blocks = NULL;
2092 struct buffer_head **real_blocks = NULL;
2093 unsigned int trans_offset;
2094 int i;
2095 int trans_half;
2096
2097 d_bh = journal_bread(sb, cur_dblock);
2098 if (!d_bh)
2099 return 1;
2100 desc = (struct reiserfs_journal_desc *)d_bh->b_data;
2101 trans_offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2102 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1037: "
2103 "journal_read_transaction, offset %llu, len %d mount_id %d",
2104 d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2105 get_desc_trans_len(desc), get_desc_mount_id(desc));
2106 if (get_desc_trans_id(desc) < oldest_trans_id) {
2107 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1039: "
2108 "journal_read_trans skipping because %lu is too old",
2109 cur_dblock -
2110 SB_ONDISK_JOURNAL_1st_BLOCK(sb));
2111 brelse(d_bh);
2112 return 1;
2113 }
2114 if (get_desc_mount_id(desc) != newest_mount_id) {
2115 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1146: "
2116 "journal_read_trans skipping because %d is != "
2117 "newest_mount_id %lu", get_desc_mount_id(desc),
2118 newest_mount_id);
2119 brelse(d_bh);
2120 return 1;
2121 }
2122 c_bh = journal_bread(sb, SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2123 ((trans_offset + get_desc_trans_len(desc) + 1) %
2124 SB_ONDISK_JOURNAL_SIZE(sb)));
2125 if (!c_bh) {
2126 brelse(d_bh);
2127 return 1;
2128 }
2129 commit = (struct reiserfs_journal_commit *)c_bh->b_data;
2130 if (journal_compare_desc_commit(sb, desc, commit)) {
2131 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2132 "journal_read_transaction, "
2133 "commit offset %llu had bad time %d or length %d",
2134 c_bh->b_blocknr -
2135 SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2136 get_commit_trans_id(commit),
2137 get_commit_trans_len(commit));
2138 brelse(c_bh);
2139 brelse(d_bh);
2140 return 1;
2141 }
2142
2143 if (bdev_read_only(sb->s_bdev)) {
2144 reiserfs_warning(sb, "clm-2076",
2145 "device is readonly, unable to replay log");
2146 brelse(c_bh);
2147 brelse(d_bh);
2148 return -EROFS;
2149 }
2150
2151 trans_id = get_desc_trans_id(desc);
2152 /* now we know we've got a good transaction, and it was inside the valid time ranges */
2153 log_blocks = kmalloc(get_desc_trans_len(desc) *
2154 sizeof(struct buffer_head *), GFP_NOFS);
2155 real_blocks = kmalloc(get_desc_trans_len(desc) *
2156 sizeof(struct buffer_head *), GFP_NOFS);
2157 if (!log_blocks || !real_blocks) {
2158 brelse(c_bh);
2159 brelse(d_bh);
2160 kfree(log_blocks);
2161 kfree(real_blocks);
2162 reiserfs_warning(sb, "journal-1169",
2163 "kmalloc failed, unable to mount FS");
2164 return -1;
2165 }
2166 /* get all the buffer heads */
2167 trans_half = journal_trans_half(sb->s_blocksize);
2168 for (i = 0; i < get_desc_trans_len(desc); i++) {
2169 log_blocks[i] =
2170 journal_getblk(sb,
2171 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2172 (trans_offset + 1 +
2173 i) % SB_ONDISK_JOURNAL_SIZE(sb));
2174 if (i < trans_half) {
2175 real_blocks[i] =
2176 sb_getblk(sb,
2177 le32_to_cpu(desc->j_realblock[i]));
2178 } else {
2179 real_blocks[i] =
2180 sb_getblk(sb,
2181 le32_to_cpu(commit->
2182 j_realblock[i - trans_half]));
2183 }
2184 if (real_blocks[i]->b_blocknr > SB_BLOCK_COUNT(sb)) {
2185 reiserfs_warning(sb, "journal-1207",
2186 "REPLAY FAILURE fsck required! "
2187 "Block to replay is outside of "
2188 "filesystem");
2189 goto abort_replay;
2190 }
2191 /* make sure we don't try to replay onto log or reserved area */
2192 if (is_block_in_log_or_reserved_area
2193 (sb, real_blocks[i]->b_blocknr)) {
2194 reiserfs_warning(sb, "journal-1204",
2195 "REPLAY FAILURE fsck required! "
2196 "Trying to replay onto a log block");
2197 abort_replay:
2198 brelse_array(log_blocks, i);
2199 brelse_array(real_blocks, i);
2200 brelse(c_bh);
2201 brelse(d_bh);
2202 kfree(log_blocks);
2203 kfree(real_blocks);
2204 return -1;
2205 }
2206 }
2207 /* read in the log blocks, memcpy to the corresponding real block */
2208 ll_rw_block(READ, get_desc_trans_len(desc), log_blocks);
2209 for (i = 0; i < get_desc_trans_len(desc); i++) {
2210
2211 reiserfs_write_unlock(sb);
2212 wait_on_buffer(log_blocks[i]);
2213 reiserfs_write_lock(sb);
2214
2215 if (!buffer_uptodate(log_blocks[i])) {
2216 reiserfs_warning(sb, "journal-1212",
2217 "REPLAY FAILURE fsck required! "
2218 "buffer write failed");
2219 brelse_array(log_blocks + i,
2220 get_desc_trans_len(desc) - i);
2221 brelse_array(real_blocks, get_desc_trans_len(desc));
2222 brelse(c_bh);
2223 brelse(d_bh);
2224 kfree(log_blocks);
2225 kfree(real_blocks);
2226 return -1;
2227 }
2228 memcpy(real_blocks[i]->b_data, log_blocks[i]->b_data,
2229 real_blocks[i]->b_size);
2230 set_buffer_uptodate(real_blocks[i]);
2231 brelse(log_blocks[i]);
2232 }
2233 /* flush out the real blocks */
2234 for (i = 0; i < get_desc_trans_len(desc); i++) {
2235 set_buffer_dirty(real_blocks[i]);
2236 write_dirty_buffer(real_blocks[i], WRITE);
2237 }
2238 for (i = 0; i < get_desc_trans_len(desc); i++) {
2239 wait_on_buffer(real_blocks[i]);
2240 if (!buffer_uptodate(real_blocks[i])) {
2241 reiserfs_warning(sb, "journal-1226",
2242 "REPLAY FAILURE, fsck required! "
2243 "buffer write failed");
2244 brelse_array(real_blocks + i,
2245 get_desc_trans_len(desc) - i);
2246 brelse(c_bh);
2247 brelse(d_bh);
2248 kfree(log_blocks);
2249 kfree(real_blocks);
2250 return -1;
2251 }
2252 brelse(real_blocks[i]);
2253 }
2254 cur_dblock =
2255 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2256 ((trans_offset + get_desc_trans_len(desc) +
2257 2) % SB_ONDISK_JOURNAL_SIZE(sb));
2258 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2259 "journal-1095: setting journal " "start to offset %ld",
2260 cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb));
2261
2262 /* init starting values for the first transaction, in case this is the last transaction to be replayed. */
2263 journal->j_start = cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2264 journal->j_last_flush_trans_id = trans_id;
2265 journal->j_trans_id = trans_id + 1;
2266 /* check for trans_id overflow */
2267 if (journal->j_trans_id == 0)
2268 journal->j_trans_id = 10;
2269 brelse(c_bh);
2270 brelse(d_bh);
2271 kfree(log_blocks);
2272 kfree(real_blocks);
2273 return 0;
2274}
2275
2276/* This function reads blocks starting from block and to max_block of bufsize
2277 size (but no more than BUFNR blocks at a time). This proved to improve
2278 mounting speed on self-rebuilding raid5 arrays at least.
2279 Right now it is only used from journal code. But later we might use it
2280 from other places.
2281 Note: Do not use journal_getblk/sb_getblk functions here! */
2282static struct buffer_head *reiserfs_breada(struct block_device *dev,
2283 b_blocknr_t block, int bufsize,
2284 b_blocknr_t max_block)
2285{
2286 struct buffer_head *bhlist[BUFNR];
2287 unsigned int blocks = BUFNR;
2288 struct buffer_head *bh;
2289 int i, j;
2290
2291 bh = __getblk(dev, block, bufsize);
2292 if (buffer_uptodate(bh))
2293 return (bh);
2294
2295 if (block + BUFNR > max_block) {
2296 blocks = max_block - block;
2297 }
2298 bhlist[0] = bh;
2299 j = 1;
2300 for (i = 1; i < blocks; i++) {
2301 bh = __getblk(dev, block + i, bufsize);
2302 if (buffer_uptodate(bh)) {
2303 brelse(bh);
2304 break;
2305 } else
2306 bhlist[j++] = bh;
2307 }
2308 ll_rw_block(READ, j, bhlist);
2309 for (i = 1; i < j; i++)
2310 brelse(bhlist[i]);
2311 bh = bhlist[0];
2312 wait_on_buffer(bh);
2313 if (buffer_uptodate(bh))
2314 return bh;
2315 brelse(bh);
2316 return NULL;
2317}
2318
2319/*
2320** read and replay the log
2321** on a clean unmount, the journal header's next unflushed pointer will be to an invalid
2322** transaction. This tests that before finding all the transactions in the log, which makes normal mount times fast.
2323**
2324** After a crash, this starts with the next unflushed transaction, and replays until it finds one too old, or invalid.
2325**
2326** On exit, it sets things up so the first transaction will work correctly.
2327*/
2328static int journal_read(struct super_block *sb)
2329{
2330 struct reiserfs_journal *journal = SB_JOURNAL(sb);
2331 struct reiserfs_journal_desc *desc;
2332 unsigned int oldest_trans_id = 0;
2333 unsigned int oldest_invalid_trans_id = 0;
2334 time_t start;
2335 unsigned long oldest_start = 0;
2336 unsigned long cur_dblock = 0;
2337 unsigned long newest_mount_id = 9;
2338 struct buffer_head *d_bh;
2339 struct reiserfs_journal_header *jh;
2340 int valid_journal_header = 0;
2341 int replay_count = 0;
2342 int continue_replay = 1;
2343 int ret;
2344 char b[BDEVNAME_SIZE];
2345
2346 cur_dblock = SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2347 reiserfs_info(sb, "checking transaction log (%s)\n",
2348 bdevname(journal->j_dev_bd, b));
2349 start = get_seconds();
2350
2351 /* step 1, read in the journal header block. Check the transaction it says
2352 ** is the first unflushed, and if that transaction is not valid,
2353 ** replay is done
2354 */
2355 journal->j_header_bh = journal_bread(sb,
2356 SB_ONDISK_JOURNAL_1st_BLOCK(sb)
2357 + SB_ONDISK_JOURNAL_SIZE(sb));
2358 if (!journal->j_header_bh) {
2359 return 1;
2360 }
2361 jh = (struct reiserfs_journal_header *)(journal->j_header_bh->b_data);
2362 if (le32_to_cpu(jh->j_first_unflushed_offset) <
2363 SB_ONDISK_JOURNAL_SIZE(sb)
2364 && le32_to_cpu(jh->j_last_flush_trans_id) > 0) {
2365 oldest_start =
2366 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2367 le32_to_cpu(jh->j_first_unflushed_offset);
2368 oldest_trans_id = le32_to_cpu(jh->j_last_flush_trans_id) + 1;
2369 newest_mount_id = le32_to_cpu(jh->j_mount_id);
2370 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2371 "journal-1153: found in "
2372 "header: first_unflushed_offset %d, last_flushed_trans_id "
2373 "%lu", le32_to_cpu(jh->j_first_unflushed_offset),
2374 le32_to_cpu(jh->j_last_flush_trans_id));
2375 valid_journal_header = 1;
2376
2377 /* now, we try to read the first unflushed offset. If it is not valid,
2378 ** there is nothing more we can do, and it makes no sense to read
2379 ** through the whole log.
2380 */
2381 d_bh =
2382 journal_bread(sb,
2383 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2384 le32_to_cpu(jh->j_first_unflushed_offset));
2385 ret = journal_transaction_is_valid(sb, d_bh, NULL, NULL);
2386 if (!ret) {
2387 continue_replay = 0;
2388 }
2389 brelse(d_bh);
2390 goto start_log_replay;
2391 }
2392
2393 /* ok, there are transactions that need to be replayed. start with the first log block, find
2394 ** all the valid transactions, and pick out the oldest.
2395 */
2396 while (continue_replay
2397 && cur_dblock <
2398 (SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2399 SB_ONDISK_JOURNAL_SIZE(sb))) {
2400 /* Note that it is required for blocksize of primary fs device and journal
2401 device to be the same */
2402 d_bh =
2403 reiserfs_breada(journal->j_dev_bd, cur_dblock,
2404 sb->s_blocksize,
2405 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2406 SB_ONDISK_JOURNAL_SIZE(sb));
2407 ret =
2408 journal_transaction_is_valid(sb, d_bh,
2409 &oldest_invalid_trans_id,
2410 &newest_mount_id);
2411 if (ret == 1) {
2412 desc = (struct reiserfs_journal_desc *)d_bh->b_data;
2413 if (oldest_start == 0) { /* init all oldest_ values */
2414 oldest_trans_id = get_desc_trans_id(desc);
2415 oldest_start = d_bh->b_blocknr;
2416 newest_mount_id = get_desc_mount_id(desc);
2417 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2418 "journal-1179: Setting "
2419 "oldest_start to offset %llu, trans_id %lu",
2420 oldest_start -
2421 SB_ONDISK_JOURNAL_1st_BLOCK
2422 (sb), oldest_trans_id);
2423 } else if (oldest_trans_id > get_desc_trans_id(desc)) {
2424 /* one we just read was older */
2425 oldest_trans_id = get_desc_trans_id(desc);
2426 oldest_start = d_bh->b_blocknr;
2427 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2428 "journal-1180: Resetting "
2429 "oldest_start to offset %lu, trans_id %lu",
2430 oldest_start -
2431 SB_ONDISK_JOURNAL_1st_BLOCK
2432 (sb), oldest_trans_id);
2433 }
2434 if (newest_mount_id < get_desc_mount_id(desc)) {
2435 newest_mount_id = get_desc_mount_id(desc);
2436 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2437 "journal-1299: Setting "
2438 "newest_mount_id to %d",
2439 get_desc_mount_id(desc));
2440 }
2441 cur_dblock += get_desc_trans_len(desc) + 2;
2442 } else {
2443 cur_dblock++;
2444 }
2445 brelse(d_bh);
2446 }
2447
2448 start_log_replay:
2449 cur_dblock = oldest_start;
2450 if (oldest_trans_id) {
2451 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2452 "journal-1206: Starting replay "
2453 "from offset %llu, trans_id %lu",
2454 cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2455 oldest_trans_id);
2456
2457 }
2458 replay_count = 0;
2459 while (continue_replay && oldest_trans_id > 0) {
2460 ret =
2461 journal_read_transaction(sb, cur_dblock, oldest_start,
2462 oldest_trans_id, newest_mount_id);
2463 if (ret < 0) {
2464 return ret;
2465 } else if (ret != 0) {
2466 break;
2467 }
2468 cur_dblock =
2469 SB_ONDISK_JOURNAL_1st_BLOCK(sb) + journal->j_start;
2470 replay_count++;
2471 if (cur_dblock == oldest_start)
2472 break;
2473 }
2474
2475 if (oldest_trans_id == 0) {
2476 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2477 "journal-1225: No valid " "transactions found");
2478 }
2479 /* j_start does not get set correctly if we don't replay any transactions.
2480 ** if we had a valid journal_header, set j_start to the first unflushed transaction value,
2481 ** copy the trans_id from the header
2482 */
2483 if (valid_journal_header && replay_count == 0) {
2484 journal->j_start = le32_to_cpu(jh->j_first_unflushed_offset);
2485 journal->j_trans_id =
2486 le32_to_cpu(jh->j_last_flush_trans_id) + 1;
2487 /* check for trans_id overflow */
2488 if (journal->j_trans_id == 0)
2489 journal->j_trans_id = 10;
2490 journal->j_last_flush_trans_id =
2491 le32_to_cpu(jh->j_last_flush_trans_id);
2492 journal->j_mount_id = le32_to_cpu(jh->j_mount_id) + 1;
2493 } else {
2494 journal->j_mount_id = newest_mount_id + 1;
2495 }
2496 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1299: Setting "
2497 "newest_mount_id to %lu", journal->j_mount_id);
2498 journal->j_first_unflushed_offset = journal->j_start;
2499 if (replay_count > 0) {
2500 reiserfs_info(sb,
2501 "replayed %d transactions in %lu seconds\n",
2502 replay_count, get_seconds() - start);
2503 }
2504 if (!bdev_read_only(sb->s_bdev) &&
2505 _update_journal_header_block(sb, journal->j_start,
2506 journal->j_last_flush_trans_id)) {
2507 /* replay failed, caller must call free_journal_ram and abort
2508 ** the mount
2509 */
2510 return -1;
2511 }
2512 return 0;
2513}
2514
2515static struct reiserfs_journal_list *alloc_journal_list(struct super_block *s)
2516{
2517 struct reiserfs_journal_list *jl;
2518 jl = kzalloc(sizeof(struct reiserfs_journal_list),
2519 GFP_NOFS | __GFP_NOFAIL);
2520 INIT_LIST_HEAD(&jl->j_list);
2521 INIT_LIST_HEAD(&jl->j_working_list);
2522 INIT_LIST_HEAD(&jl->j_tail_bh_list);
2523 INIT_LIST_HEAD(&jl->j_bh_list);
2524 mutex_init(&jl->j_commit_mutex);
2525 SB_JOURNAL(s)->j_num_lists++;
2526 get_journal_list(jl);
2527 return jl;
2528}
2529
2530static void journal_list_init(struct super_block *sb)
2531{
2532 SB_JOURNAL(sb)->j_current_jl = alloc_journal_list(sb);
2533}
2534
2535static int release_journal_dev(struct super_block *super,
2536 struct reiserfs_journal *journal)
2537{
2538 int result;
2539
2540 result = 0;
2541
2542 if (journal->j_dev_bd != NULL) {
2543 result = blkdev_put(journal->j_dev_bd, journal->j_dev_mode);
2544 journal->j_dev_bd = NULL;
2545 }
2546
2547 if (result != 0) {
2548 reiserfs_warning(super, "sh-457",
2549 "Cannot release journal device: %i", result);
2550 }
2551 return result;
2552}
2553
2554static int journal_init_dev(struct super_block *super,
2555 struct reiserfs_journal *journal,
2556 const char *jdev_name)
2557{
2558 int result;
2559 dev_t jdev;
2560 fmode_t blkdev_mode = FMODE_READ | FMODE_WRITE | FMODE_EXCL;
2561 char b[BDEVNAME_SIZE];
2562
2563 result = 0;
2564
2565 journal->j_dev_bd = NULL;
2566 jdev = SB_ONDISK_JOURNAL_DEVICE(super) ?
2567 new_decode_dev(SB_ONDISK_JOURNAL_DEVICE(super)) : super->s_dev;
2568
2569 if (bdev_read_only(super->s_bdev))
2570 blkdev_mode = FMODE_READ;
2571
2572 /* there is no "jdev" option and journal is on separate device */
2573 if ((!jdev_name || !jdev_name[0])) {
2574 if (jdev == super->s_dev)
2575 blkdev_mode &= ~FMODE_EXCL;
2576 journal->j_dev_bd = blkdev_get_by_dev(jdev, blkdev_mode,
2577 journal);
2578 journal->j_dev_mode = blkdev_mode;
2579 if (IS_ERR(journal->j_dev_bd)) {
2580 result = PTR_ERR(journal->j_dev_bd);
2581 journal->j_dev_bd = NULL;
2582 reiserfs_warning(super, "sh-458",
2583 "cannot init journal device '%s': %i",
2584 __bdevname(jdev, b), result);
2585 return result;
2586 } else if (jdev != super->s_dev)
2587 set_blocksize(journal->j_dev_bd, super->s_blocksize);
2588
2589 return 0;
2590 }
2591
2592 journal->j_dev_mode = blkdev_mode;
2593 journal->j_dev_bd = blkdev_get_by_path(jdev_name, blkdev_mode, journal);
2594 if (IS_ERR(journal->j_dev_bd)) {
2595 result = PTR_ERR(journal->j_dev_bd);
2596 journal->j_dev_bd = NULL;
2597 reiserfs_warning(super,
2598 "journal_init_dev: Cannot open '%s': %i",
2599 jdev_name, result);
2600 return result;
2601 }
2602
2603 set_blocksize(journal->j_dev_bd, super->s_blocksize);
2604 reiserfs_info(super,
2605 "journal_init_dev: journal device: %s\n",
2606 bdevname(journal->j_dev_bd, b));
2607 return 0;
2608}
2609
2610/**
2611 * When creating/tuning a file system user can assign some
2612 * journal params within boundaries which depend on the ratio
2613 * blocksize/standard_blocksize.
2614 *
2615 * For blocks >= standard_blocksize transaction size should
2616 * be not less then JOURNAL_TRANS_MIN_DEFAULT, and not more
2617 * then JOURNAL_TRANS_MAX_DEFAULT.
2618 *
2619 * For blocks < standard_blocksize these boundaries should be
2620 * decreased proportionally.
2621 */
2622#define REISERFS_STANDARD_BLKSIZE (4096)
2623
2624static int check_advise_trans_params(struct super_block *sb,
2625 struct reiserfs_journal *journal)
2626{
2627 if (journal->j_trans_max) {
2628 /* Non-default journal params.
2629 Do sanity check for them. */
2630 int ratio = 1;
2631 if (sb->s_blocksize < REISERFS_STANDARD_BLKSIZE)
2632 ratio = REISERFS_STANDARD_BLKSIZE / sb->s_blocksize;
2633
2634 if (journal->j_trans_max > JOURNAL_TRANS_MAX_DEFAULT / ratio ||
2635 journal->j_trans_max < JOURNAL_TRANS_MIN_DEFAULT / ratio ||
2636 SB_ONDISK_JOURNAL_SIZE(sb) / journal->j_trans_max <
2637 JOURNAL_MIN_RATIO) {
2638 reiserfs_warning(sb, "sh-462",
2639 "bad transaction max size (%u). "
2640 "FSCK?", journal->j_trans_max);
2641 return 1;
2642 }
2643 if (journal->j_max_batch != (journal->j_trans_max) *
2644 JOURNAL_MAX_BATCH_DEFAULT/JOURNAL_TRANS_MAX_DEFAULT) {
2645 reiserfs_warning(sb, "sh-463",
2646 "bad transaction max batch (%u). "
2647 "FSCK?", journal->j_max_batch);
2648 return 1;
2649 }
2650 } else {
2651 /* Default journal params.
2652 The file system was created by old version
2653 of mkreiserfs, so some fields contain zeros,
2654 and we need to advise proper values for them */
2655 if (sb->s_blocksize != REISERFS_STANDARD_BLKSIZE) {
2656 reiserfs_warning(sb, "sh-464", "bad blocksize (%u)",
2657 sb->s_blocksize);
2658 return 1;
2659 }
2660 journal->j_trans_max = JOURNAL_TRANS_MAX_DEFAULT;
2661 journal->j_max_batch = JOURNAL_MAX_BATCH_DEFAULT;
2662 journal->j_max_commit_age = JOURNAL_MAX_COMMIT_AGE;
2663 }
2664 return 0;
2665}
2666
2667/*
2668** must be called once on fs mount. calls journal_read for you
2669*/
2670int journal_init(struct super_block *sb, const char *j_dev_name,
2671 int old_format, unsigned int commit_max_age)
2672{
2673 int num_cnodes = SB_ONDISK_JOURNAL_SIZE(sb) * 2;
2674 struct buffer_head *bhjh;
2675 struct reiserfs_super_block *rs;
2676 struct reiserfs_journal_header *jh;
2677 struct reiserfs_journal *journal;
2678 struct reiserfs_journal_list *jl;
2679 char b[BDEVNAME_SIZE];
2680 int ret;
2681
2682 journal = SB_JOURNAL(sb) = vzalloc(sizeof(struct reiserfs_journal));
2683 if (!journal) {
2684 reiserfs_warning(sb, "journal-1256",
2685 "unable to get memory for journal structure");
2686 return 1;
2687 }
2688 INIT_LIST_HEAD(&journal->j_bitmap_nodes);
2689 INIT_LIST_HEAD(&journal->j_prealloc_list);
2690 INIT_LIST_HEAD(&journal->j_working_list);
2691 INIT_LIST_HEAD(&journal->j_journal_list);
2692 journal->j_persistent_trans = 0;
2693 if (reiserfs_allocate_list_bitmaps(sb, journal->j_list_bitmap,
2694 reiserfs_bmap_count(sb)))
2695 goto free_and_return;
2696
2697 allocate_bitmap_nodes(sb);
2698
2699 /* reserved for journal area support */
2700 SB_JOURNAL_1st_RESERVED_BLOCK(sb) = (old_format ?
2701 REISERFS_OLD_DISK_OFFSET_IN_BYTES
2702 / sb->s_blocksize +
2703 reiserfs_bmap_count(sb) +
2704 1 :
2705 REISERFS_DISK_OFFSET_IN_BYTES /
2706 sb->s_blocksize + 2);
2707
2708 /* Sanity check to see is the standard journal fitting within first bitmap
2709 (actual for small blocksizes) */
2710 if (!SB_ONDISK_JOURNAL_DEVICE(sb) &&
2711 (SB_JOURNAL_1st_RESERVED_BLOCK(sb) +
2712 SB_ONDISK_JOURNAL_SIZE(sb) > sb->s_blocksize * 8)) {
2713 reiserfs_warning(sb, "journal-1393",
2714 "journal does not fit for area addressed "
2715 "by first of bitmap blocks. It starts at "
2716 "%u and its size is %u. Block size %ld",
2717 SB_JOURNAL_1st_RESERVED_BLOCK(sb),
2718 SB_ONDISK_JOURNAL_SIZE(sb),
2719 sb->s_blocksize);
2720 goto free_and_return;
2721 }
2722
2723 if (journal_init_dev(sb, journal, j_dev_name) != 0) {
2724 reiserfs_warning(sb, "sh-462",
2725 "unable to initialize jornal device");
2726 goto free_and_return;
2727 }
2728
2729 rs = SB_DISK_SUPER_BLOCK(sb);
2730
2731 /* read journal header */
2732 bhjh = journal_bread(sb,
2733 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2734 SB_ONDISK_JOURNAL_SIZE(sb));
2735 if (!bhjh) {
2736 reiserfs_warning(sb, "sh-459",
2737 "unable to read journal header");
2738 goto free_and_return;
2739 }
2740 jh = (struct reiserfs_journal_header *)(bhjh->b_data);
2741
2742 /* make sure that journal matches to the super block */
2743 if (is_reiserfs_jr(rs)
2744 && (le32_to_cpu(jh->jh_journal.jp_journal_magic) !=
2745 sb_jp_journal_magic(rs))) {
2746 reiserfs_warning(sb, "sh-460",
2747 "journal header magic %x (device %s) does "
2748 "not match to magic found in super block %x",
2749 jh->jh_journal.jp_journal_magic,
2750 bdevname(journal->j_dev_bd, b),
2751 sb_jp_journal_magic(rs));
2752 brelse(bhjh);
2753 goto free_and_return;
2754 }
2755
2756 journal->j_trans_max = le32_to_cpu(jh->jh_journal.jp_journal_trans_max);
2757 journal->j_max_batch = le32_to_cpu(jh->jh_journal.jp_journal_max_batch);
2758 journal->j_max_commit_age =
2759 le32_to_cpu(jh->jh_journal.jp_journal_max_commit_age);
2760 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
2761
2762 if (check_advise_trans_params(sb, journal) != 0)
2763 goto free_and_return;
2764 journal->j_default_max_commit_age = journal->j_max_commit_age;
2765
2766 if (commit_max_age != 0) {
2767 journal->j_max_commit_age = commit_max_age;
2768 journal->j_max_trans_age = commit_max_age;
2769 }
2770
2771 reiserfs_info(sb, "journal params: device %s, size %u, "
2772 "journal first block %u, max trans len %u, max batch %u, "
2773 "max commit age %u, max trans age %u\n",
2774 bdevname(journal->j_dev_bd, b),
2775 SB_ONDISK_JOURNAL_SIZE(sb),
2776 SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2777 journal->j_trans_max,
2778 journal->j_max_batch,
2779 journal->j_max_commit_age, journal->j_max_trans_age);
2780
2781 brelse(bhjh);
2782
2783 journal->j_list_bitmap_index = 0;
2784 journal_list_init(sb);
2785
2786 memset(journal->j_list_hash_table, 0,
2787 JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *));
2788
2789 INIT_LIST_HEAD(&journal->j_dirty_buffers);
2790 spin_lock_init(&journal->j_dirty_buffers_lock);
2791
2792 journal->j_start = 0;
2793 journal->j_len = 0;
2794 journal->j_len_alloc = 0;
2795 atomic_set(&(journal->j_wcount), 0);
2796 atomic_set(&(journal->j_async_throttle), 0);
2797 journal->j_bcount = 0;
2798 journal->j_trans_start_time = 0;
2799 journal->j_last = NULL;
2800 journal->j_first = NULL;
2801 init_waitqueue_head(&(journal->j_join_wait));
2802 mutex_init(&journal->j_mutex);
2803 mutex_init(&journal->j_flush_mutex);
2804
2805 journal->j_trans_id = 10;
2806 journal->j_mount_id = 10;
2807 journal->j_state = 0;
2808 atomic_set(&(journal->j_jlock), 0);
2809 journal->j_cnode_free_list = allocate_cnodes(num_cnodes);
2810 journal->j_cnode_free_orig = journal->j_cnode_free_list;
2811 journal->j_cnode_free = journal->j_cnode_free_list ? num_cnodes : 0;
2812 journal->j_cnode_used = 0;
2813 journal->j_must_wait = 0;
2814
2815 if (journal->j_cnode_free == 0) {
2816 reiserfs_warning(sb, "journal-2004", "Journal cnode memory "
2817 "allocation failed (%ld bytes). Journal is "
2818 "too large for available memory. Usually "
2819 "this is due to a journal that is too large.",
2820 sizeof (struct reiserfs_journal_cnode) * num_cnodes);
2821 goto free_and_return;
2822 }
2823
2824 init_journal_hash(sb);
2825 jl = journal->j_current_jl;
2826
2827 /*
2828 * get_list_bitmap() may call flush_commit_list() which
2829 * requires the lock. Calling flush_commit_list() shouldn't happen
2830 * this early but I like to be paranoid.
2831 */
2832 reiserfs_write_lock(sb);
2833 jl->j_list_bitmap = get_list_bitmap(sb, jl);
2834 reiserfs_write_unlock(sb);
2835 if (!jl->j_list_bitmap) {
2836 reiserfs_warning(sb, "journal-2005",
2837 "get_list_bitmap failed for journal list 0");
2838 goto free_and_return;
2839 }
2840
2841 /*
2842 * Journal_read needs to be inspected in order to push down
2843 * the lock further inside (or even remove it).
2844 */
2845 reiserfs_write_lock(sb);
2846 ret = journal_read(sb);
2847 reiserfs_write_unlock(sb);
2848 if (ret < 0) {
2849 reiserfs_warning(sb, "reiserfs-2006",
2850 "Replay Failure, unable to mount");
2851 goto free_and_return;
2852 }
2853
2854 reiserfs_mounted_fs_count++;
2855 if (reiserfs_mounted_fs_count <= 1)
2856 commit_wq = alloc_workqueue("reiserfs", WQ_MEM_RECLAIM, 0);
2857
2858 INIT_DELAYED_WORK(&journal->j_work, flush_async_commits);
2859 journal->j_work_sb = sb;
2860 return 0;
2861 free_and_return:
2862 free_journal_ram(sb);
2863 return 1;
2864}
2865
2866/*
2867** test for a polite end of the current transaction. Used by file_write, and should
2868** be used by delete to make sure they don't write more than can fit inside a single
2869** transaction
2870*/
2871int journal_transaction_should_end(struct reiserfs_transaction_handle *th,
2872 int new_alloc)
2873{
2874 struct reiserfs_journal *journal = SB_JOURNAL(th->t_super);
2875 time_t now = get_seconds();
2876 /* cannot restart while nested */
2877 BUG_ON(!th->t_trans_id);
2878 if (th->t_refcount > 1)
2879 return 0;
2880 if (journal->j_must_wait > 0 ||
2881 (journal->j_len_alloc + new_alloc) >= journal->j_max_batch ||
2882 atomic_read(&(journal->j_jlock)) ||
2883 (now - journal->j_trans_start_time) > journal->j_max_trans_age ||
2884 journal->j_cnode_free < (journal->j_trans_max * 3)) {
2885 return 1;
2886 }
2887
2888 journal->j_len_alloc += new_alloc;
2889 th->t_blocks_allocated += new_alloc ;
2890 return 0;
2891}
2892
2893/* this must be called inside a transaction
2894*/
2895void reiserfs_block_writes(struct reiserfs_transaction_handle *th)
2896{
2897 struct reiserfs_journal *journal = SB_JOURNAL(th->t_super);
2898 BUG_ON(!th->t_trans_id);
2899 journal->j_must_wait = 1;
2900 set_bit(J_WRITERS_BLOCKED, &journal->j_state);
2901 return;
2902}
2903
2904/* this must be called without a transaction started
2905*/
2906void reiserfs_allow_writes(struct super_block *s)
2907{
2908 struct reiserfs_journal *journal = SB_JOURNAL(s);
2909 clear_bit(J_WRITERS_BLOCKED, &journal->j_state);
2910 wake_up(&journal->j_join_wait);
2911}
2912
2913/* this must be called without a transaction started
2914*/
2915void reiserfs_wait_on_write_block(struct super_block *s)
2916{
2917 struct reiserfs_journal *journal = SB_JOURNAL(s);
2918 wait_event(journal->j_join_wait,
2919 !test_bit(J_WRITERS_BLOCKED, &journal->j_state));
2920}
2921
2922static void queue_log_writer(struct super_block *s)
2923{
2924 wait_queue_t wait;
2925 struct reiserfs_journal *journal = SB_JOURNAL(s);
2926 set_bit(J_WRITERS_QUEUED, &journal->j_state);
2927
2928 /*
2929 * we don't want to use wait_event here because
2930 * we only want to wait once.
2931 */
2932 init_waitqueue_entry(&wait, current);
2933 add_wait_queue(&journal->j_join_wait, &wait);
2934 set_current_state(TASK_UNINTERRUPTIBLE);
2935 if (test_bit(J_WRITERS_QUEUED, &journal->j_state)) {
2936 reiserfs_write_unlock(s);
2937 schedule();
2938 reiserfs_write_lock(s);
2939 }
2940 __set_current_state(TASK_RUNNING);
2941 remove_wait_queue(&journal->j_join_wait, &wait);
2942}
2943
2944static void wake_queued_writers(struct super_block *s)
2945{
2946 struct reiserfs_journal *journal = SB_JOURNAL(s);
2947 if (test_and_clear_bit(J_WRITERS_QUEUED, &journal->j_state))
2948 wake_up(&journal->j_join_wait);
2949}
2950
2951static void let_transaction_grow(struct super_block *sb, unsigned int trans_id)
2952{
2953 struct reiserfs_journal *journal = SB_JOURNAL(sb);
2954 unsigned long bcount = journal->j_bcount;
2955 while (1) {
2956 reiserfs_write_unlock(sb);
2957 schedule_timeout_uninterruptible(1);
2958 reiserfs_write_lock(sb);
2959 journal->j_current_jl->j_state |= LIST_COMMIT_PENDING;
2960 while ((atomic_read(&journal->j_wcount) > 0 ||
2961 atomic_read(&journal->j_jlock)) &&
2962 journal->j_trans_id == trans_id) {
2963 queue_log_writer(sb);
2964 }
2965 if (journal->j_trans_id != trans_id)
2966 break;
2967 if (bcount == journal->j_bcount)
2968 break;
2969 bcount = journal->j_bcount;
2970 }
2971}
2972
2973/* join == true if you must join an existing transaction.
2974** join == false if you can deal with waiting for others to finish
2975**
2976** this will block until the transaction is joinable. send the number of blocks you
2977** expect to use in nblocks.
2978*/
2979static int do_journal_begin_r(struct reiserfs_transaction_handle *th,
2980 struct super_block *sb, unsigned long nblocks,
2981 int join)
2982{
2983 time_t now = get_seconds();
2984 unsigned int old_trans_id;
2985 struct reiserfs_journal *journal = SB_JOURNAL(sb);
2986 struct reiserfs_transaction_handle myth;
2987 int sched_count = 0;
2988 int retval;
2989
2990 reiserfs_check_lock_depth(sb, "journal_begin");
2991 BUG_ON(nblocks > journal->j_trans_max);
2992
2993 PROC_INFO_INC(sb, journal.journal_being);
2994 /* set here for journal_join */
2995 th->t_refcount = 1;
2996 th->t_super = sb;
2997
2998 relock:
2999 lock_journal(sb);
3000 if (join != JBEGIN_ABORT && reiserfs_is_journal_aborted(journal)) {
3001 unlock_journal(sb);
3002 retval = journal->j_errno;
3003 goto out_fail;
3004 }
3005 journal->j_bcount++;
3006
3007 if (test_bit(J_WRITERS_BLOCKED, &journal->j_state)) {
3008 unlock_journal(sb);
3009 reiserfs_write_unlock(sb);
3010 reiserfs_wait_on_write_block(sb);
3011 reiserfs_write_lock(sb);
3012 PROC_INFO_INC(sb, journal.journal_relock_writers);
3013 goto relock;
3014 }
3015 now = get_seconds();
3016
3017 /* if there is no room in the journal OR
3018 ** if this transaction is too old, and we weren't called joinable, wait for it to finish before beginning
3019 ** we don't sleep if there aren't other writers
3020 */
3021
3022 if ((!join && journal->j_must_wait > 0) ||
3023 (!join
3024 && (journal->j_len_alloc + nblocks + 2) >= journal->j_max_batch)
3025 || (!join && atomic_read(&journal->j_wcount) > 0
3026 && journal->j_trans_start_time > 0
3027 && (now - journal->j_trans_start_time) >
3028 journal->j_max_trans_age) || (!join
3029 && atomic_read(&journal->j_jlock))
3030 || (!join && journal->j_cnode_free < (journal->j_trans_max * 3))) {
3031
3032 old_trans_id = journal->j_trans_id;
3033 unlock_journal(sb); /* allow others to finish this transaction */
3034
3035 if (!join && (journal->j_len_alloc + nblocks + 2) >=
3036 journal->j_max_batch &&
3037 ((journal->j_len + nblocks + 2) * 100) <
3038 (journal->j_len_alloc * 75)) {
3039 if (atomic_read(&journal->j_wcount) > 10) {
3040 sched_count++;
3041 queue_log_writer(sb);
3042 goto relock;
3043 }
3044 }
3045 /* don't mess with joining the transaction if all we have to do is
3046 * wait for someone else to do a commit
3047 */
3048 if (atomic_read(&journal->j_jlock)) {
3049 while (journal->j_trans_id == old_trans_id &&
3050 atomic_read(&journal->j_jlock)) {
3051 queue_log_writer(sb);
3052 }
3053 goto relock;
3054 }
3055 retval = journal_join(&myth, sb, 1);
3056 if (retval)
3057 goto out_fail;
3058
3059 /* someone might have ended the transaction while we joined */
3060 if (old_trans_id != journal->j_trans_id) {
3061 retval = do_journal_end(&myth, sb, 1, 0);
3062 } else {
3063 retval = do_journal_end(&myth, sb, 1, COMMIT_NOW);
3064 }
3065
3066 if (retval)
3067 goto out_fail;
3068
3069 PROC_INFO_INC(sb, journal.journal_relock_wcount);
3070 goto relock;
3071 }
3072 /* we are the first writer, set trans_id */
3073 if (journal->j_trans_start_time == 0) {
3074 journal->j_trans_start_time = get_seconds();
3075 }
3076 atomic_inc(&(journal->j_wcount));
3077 journal->j_len_alloc += nblocks;
3078 th->t_blocks_logged = 0;
3079 th->t_blocks_allocated = nblocks;
3080 th->t_trans_id = journal->j_trans_id;
3081 unlock_journal(sb);
3082 INIT_LIST_HEAD(&th->t_list);
3083 return 0;
3084
3085 out_fail:
3086 memset(th, 0, sizeof(*th));
3087 /* Re-set th->t_super, so we can properly keep track of how many
3088 * persistent transactions there are. We need to do this so if this
3089 * call is part of a failed restart_transaction, we can free it later */
3090 th->t_super = sb;
3091 return retval;
3092}
3093
3094struct reiserfs_transaction_handle *reiserfs_persistent_transaction(struct
3095 super_block
3096 *s,
3097 int nblocks)
3098{
3099 int ret;
3100 struct reiserfs_transaction_handle *th;
3101
3102 /* if we're nesting into an existing transaction. It will be
3103 ** persistent on its own
3104 */
3105 if (reiserfs_transaction_running(s)) {
3106 th = current->journal_info;
3107 th->t_refcount++;
3108 BUG_ON(th->t_refcount < 2);
3109
3110 return th;
3111 }
3112 th = kmalloc(sizeof(struct reiserfs_transaction_handle), GFP_NOFS);
3113 if (!th)
3114 return NULL;
3115 ret = journal_begin(th, s, nblocks);
3116 if (ret) {
3117 kfree(th);
3118 return NULL;
3119 }
3120
3121 SB_JOURNAL(s)->j_persistent_trans++;
3122 return th;
3123}
3124
3125int reiserfs_end_persistent_transaction(struct reiserfs_transaction_handle *th)
3126{
3127 struct super_block *s = th->t_super;
3128 int ret = 0;
3129 if (th->t_trans_id)
3130 ret = journal_end(th, th->t_super, th->t_blocks_allocated);
3131 else
3132 ret = -EIO;
3133 if (th->t_refcount == 0) {
3134 SB_JOURNAL(s)->j_persistent_trans--;
3135 kfree(th);
3136 }
3137 return ret;
3138}
3139
3140static int journal_join(struct reiserfs_transaction_handle *th,
3141 struct super_block *sb, unsigned long nblocks)
3142{
3143 struct reiserfs_transaction_handle *cur_th = current->journal_info;
3144
3145 /* this keeps do_journal_end from NULLing out the current->journal_info
3146 ** pointer
3147 */
3148 th->t_handle_save = cur_th;
3149 BUG_ON(cur_th && cur_th->t_refcount > 1);
3150 return do_journal_begin_r(th, sb, nblocks, JBEGIN_JOIN);
3151}
3152
3153int journal_join_abort(struct reiserfs_transaction_handle *th,
3154 struct super_block *sb, unsigned long nblocks)
3155{
3156 struct reiserfs_transaction_handle *cur_th = current->journal_info;
3157
3158 /* this keeps do_journal_end from NULLing out the current->journal_info
3159 ** pointer
3160 */
3161 th->t_handle_save = cur_th;
3162 BUG_ON(cur_th && cur_th->t_refcount > 1);
3163 return do_journal_begin_r(th, sb, nblocks, JBEGIN_ABORT);
3164}
3165
3166int journal_begin(struct reiserfs_transaction_handle *th,
3167 struct super_block *sb, unsigned long nblocks)
3168{
3169 struct reiserfs_transaction_handle *cur_th = current->journal_info;
3170 int ret;
3171
3172 th->t_handle_save = NULL;
3173 if (cur_th) {
3174 /* we are nesting into the current transaction */
3175 if (cur_th->t_super == sb) {
3176 BUG_ON(!cur_th->t_refcount);
3177 cur_th->t_refcount++;
3178 memcpy(th, cur_th, sizeof(*th));
3179 if (th->t_refcount <= 1)
3180 reiserfs_warning(sb, "reiserfs-2005",
3181 "BAD: refcount <= 1, but "
3182 "journal_info != 0");
3183 return 0;
3184 } else {
3185 /* we've ended up with a handle from a different filesystem.
3186 ** save it and restore on journal_end. This should never
3187 ** really happen...
3188 */
3189 reiserfs_warning(sb, "clm-2100",
3190 "nesting info a different FS");
3191 th->t_handle_save = current->journal_info;
3192 current->journal_info = th;
3193 }
3194 } else {
3195 current->journal_info = th;
3196 }
3197 ret = do_journal_begin_r(th, sb, nblocks, JBEGIN_REG);
3198 BUG_ON(current->journal_info != th);
3199
3200 /* I guess this boils down to being the reciprocal of clm-2100 above.
3201 * If do_journal_begin_r fails, we need to put it back, since journal_end
3202 * won't be called to do it. */
3203 if (ret)
3204 current->journal_info = th->t_handle_save;
3205 else
3206 BUG_ON(!th->t_refcount);
3207
3208 return ret;
3209}
3210
3211/*
3212** puts bh into the current transaction. If it was already there, reorders removes the
3213** old pointers from the hash, and puts new ones in (to make sure replay happen in the right order).
3214**
3215** if it was dirty, cleans and files onto the clean list. I can't let it be dirty again until the
3216** transaction is committed.
3217**
3218** if j_len, is bigger than j_len_alloc, it pushes j_len_alloc to 10 + j_len.
3219*/
3220int journal_mark_dirty(struct reiserfs_transaction_handle *th,
3221 struct super_block *sb, struct buffer_head *bh)
3222{
3223 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3224 struct reiserfs_journal_cnode *cn = NULL;
3225 int count_already_incd = 0;
3226 int prepared = 0;
3227 BUG_ON(!th->t_trans_id);
3228
3229 PROC_INFO_INC(sb, journal.mark_dirty);
3230 if (th->t_trans_id != journal->j_trans_id) {
3231 reiserfs_panic(th->t_super, "journal-1577",
3232 "handle trans id %ld != current trans id %ld",
3233 th->t_trans_id, journal->j_trans_id);
3234 }
3235
3236 prepared = test_clear_buffer_journal_prepared(bh);
3237 clear_buffer_journal_restore_dirty(bh);
3238 /* already in this transaction, we are done */
3239 if (buffer_journaled(bh)) {
3240 PROC_INFO_INC(sb, journal.mark_dirty_already);
3241 return 0;
3242 }
3243
3244 /* this must be turned into a panic instead of a warning. We can't allow
3245 ** a dirty or journal_dirty or locked buffer to be logged, as some changes
3246 ** could get to disk too early. NOT GOOD.
3247 */
3248 if (!prepared || buffer_dirty(bh)) {
3249 reiserfs_warning(sb, "journal-1777",
3250 "buffer %llu bad state "
3251 "%cPREPARED %cLOCKED %cDIRTY %cJDIRTY_WAIT",
3252 (unsigned long long)bh->b_blocknr,
3253 prepared ? ' ' : '!',
3254 buffer_locked(bh) ? ' ' : '!',
3255 buffer_dirty(bh) ? ' ' : '!',
3256 buffer_journal_dirty(bh) ? ' ' : '!');
3257 }
3258
3259 if (atomic_read(&(journal->j_wcount)) <= 0) {
3260 reiserfs_warning(sb, "journal-1409",
3261 "returning because j_wcount was %d",
3262 atomic_read(&(journal->j_wcount)));
3263 return 1;
3264 }
3265 /* this error means I've screwed up, and we've overflowed the transaction.
3266 ** Nothing can be done here, except make the FS readonly or panic.
3267 */
3268 if (journal->j_len >= journal->j_trans_max) {
3269 reiserfs_panic(th->t_super, "journal-1413",
3270 "j_len (%lu) is too big",
3271 journal->j_len);
3272 }
3273
3274 if (buffer_journal_dirty(bh)) {
3275 count_already_incd = 1;
3276 PROC_INFO_INC(sb, journal.mark_dirty_notjournal);
3277 clear_buffer_journal_dirty(bh);
3278 }
3279
3280 if (journal->j_len > journal->j_len_alloc) {
3281 journal->j_len_alloc = journal->j_len + JOURNAL_PER_BALANCE_CNT;
3282 }
3283
3284 set_buffer_journaled(bh);
3285
3286 /* now put this guy on the end */
3287 if (!cn) {
3288 cn = get_cnode(sb);
3289 if (!cn) {
3290 reiserfs_panic(sb, "journal-4", "get_cnode failed!");
3291 }
3292
3293 if (th->t_blocks_logged == th->t_blocks_allocated) {
3294 th->t_blocks_allocated += JOURNAL_PER_BALANCE_CNT;
3295 journal->j_len_alloc += JOURNAL_PER_BALANCE_CNT;
3296 }
3297 th->t_blocks_logged++;
3298 journal->j_len++;
3299
3300 cn->bh = bh;
3301 cn->blocknr = bh->b_blocknr;
3302 cn->sb = sb;
3303 cn->jlist = NULL;
3304 insert_journal_hash(journal->j_hash_table, cn);
3305 if (!count_already_incd) {
3306 get_bh(bh);
3307 }
3308 }
3309 cn->next = NULL;
3310 cn->prev = journal->j_last;
3311 cn->bh = bh;
3312 if (journal->j_last) {
3313 journal->j_last->next = cn;
3314 journal->j_last = cn;
3315 } else {
3316 journal->j_first = cn;
3317 journal->j_last = cn;
3318 }
3319 reiserfs_schedule_old_flush(sb);
3320 return 0;
3321}
3322
3323int journal_end(struct reiserfs_transaction_handle *th,
3324 struct super_block *sb, unsigned long nblocks)
3325{
3326 if (!current->journal_info && th->t_refcount > 1)
3327 reiserfs_warning(sb, "REISER-NESTING",
3328 "th NULL, refcount %d", th->t_refcount);
3329
3330 if (!th->t_trans_id) {
3331 WARN_ON(1);
3332 return -EIO;
3333 }
3334
3335 th->t_refcount--;
3336 if (th->t_refcount > 0) {
3337 struct reiserfs_transaction_handle *cur_th =
3338 current->journal_info;
3339
3340 /* we aren't allowed to close a nested transaction on a different
3341 ** filesystem from the one in the task struct
3342 */
3343 BUG_ON(cur_th->t_super != th->t_super);
3344
3345 if (th != cur_th) {
3346 memcpy(current->journal_info, th, sizeof(*th));
3347 th->t_trans_id = 0;
3348 }
3349 return 0;
3350 } else {
3351 return do_journal_end(th, sb, nblocks, 0);
3352 }
3353}
3354
3355/* removes from the current transaction, relsing and descrementing any counters.
3356** also files the removed buffer directly onto the clean list
3357**
3358** called by journal_mark_freed when a block has been deleted
3359**
3360** returns 1 if it cleaned and relsed the buffer. 0 otherwise
3361*/
3362static int remove_from_transaction(struct super_block *sb,
3363 b_blocknr_t blocknr, int already_cleaned)
3364{
3365 struct buffer_head *bh;
3366 struct reiserfs_journal_cnode *cn;
3367 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3368 int ret = 0;
3369
3370 cn = get_journal_hash_dev(sb, journal->j_hash_table, blocknr);
3371 if (!cn || !cn->bh) {
3372 return ret;
3373 }
3374 bh = cn->bh;
3375 if (cn->prev) {
3376 cn->prev->next = cn->next;
3377 }
3378 if (cn->next) {
3379 cn->next->prev = cn->prev;
3380 }
3381 if (cn == journal->j_first) {
3382 journal->j_first = cn->next;
3383 }
3384 if (cn == journal->j_last) {
3385 journal->j_last = cn->prev;
3386 }
3387 if (bh)
3388 remove_journal_hash(sb, journal->j_hash_table, NULL,
3389 bh->b_blocknr, 0);
3390 clear_buffer_journaled(bh); /* don't log this one */
3391
3392 if (!already_cleaned) {
3393 clear_buffer_journal_dirty(bh);
3394 clear_buffer_dirty(bh);
3395 clear_buffer_journal_test(bh);
3396 put_bh(bh);
3397 if (atomic_read(&(bh->b_count)) < 0) {
3398 reiserfs_warning(sb, "journal-1752",
3399 "b_count < 0");
3400 }
3401 ret = 1;
3402 }
3403 journal->j_len--;
3404 journal->j_len_alloc--;
3405 free_cnode(sb, cn);
3406 return ret;
3407}
3408
3409/*
3410** for any cnode in a journal list, it can only be dirtied of all the
3411** transactions that include it are committed to disk.
3412** this checks through each transaction, and returns 1 if you are allowed to dirty,
3413** and 0 if you aren't
3414**
3415** it is called by dirty_journal_list, which is called after flush_commit_list has gotten all the log
3416** blocks for a given transaction on disk
3417**
3418*/
3419static int can_dirty(struct reiserfs_journal_cnode *cn)
3420{
3421 struct super_block *sb = cn->sb;
3422 b_blocknr_t blocknr = cn->blocknr;
3423 struct reiserfs_journal_cnode *cur = cn->hprev;
3424 int can_dirty = 1;
3425
3426 /* first test hprev. These are all newer than cn, so any node here
3427 ** with the same block number and dev means this node can't be sent
3428 ** to disk right now.
3429 */
3430 while (cur && can_dirty) {
3431 if (cur->jlist && cur->bh && cur->blocknr && cur->sb == sb &&
3432 cur->blocknr == blocknr) {
3433 can_dirty = 0;
3434 }
3435 cur = cur->hprev;
3436 }
3437 /* then test hnext. These are all older than cn. As long as they
3438 ** are committed to the log, it is safe to write cn to disk
3439 */
3440 cur = cn->hnext;
3441 while (cur && can_dirty) {
3442 if (cur->jlist && cur->jlist->j_len > 0 &&
3443 atomic_read(&(cur->jlist->j_commit_left)) > 0 && cur->bh &&
3444 cur->blocknr && cur->sb == sb && cur->blocknr == blocknr) {
3445 can_dirty = 0;
3446 }
3447 cur = cur->hnext;
3448 }
3449 return can_dirty;
3450}
3451
3452/* syncs the commit blocks, but does not force the real buffers to disk
3453** will wait until the current transaction is done/committed before returning
3454*/
3455int journal_end_sync(struct reiserfs_transaction_handle *th,
3456 struct super_block *sb, unsigned long nblocks)
3457{
3458 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3459
3460 BUG_ON(!th->t_trans_id);
3461 /* you can sync while nested, very, very bad */
3462 BUG_ON(th->t_refcount > 1);
3463 if (journal->j_len == 0) {
3464 reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
3465 1);
3466 journal_mark_dirty(th, sb, SB_BUFFER_WITH_SB(sb));
3467 }
3468 return do_journal_end(th, sb, nblocks, COMMIT_NOW | WAIT);
3469}
3470
3471/*
3472** writeback the pending async commits to disk
3473*/
3474static void flush_async_commits(struct work_struct *work)
3475{
3476 struct reiserfs_journal *journal =
3477 container_of(work, struct reiserfs_journal, j_work.work);
3478 struct super_block *sb = journal->j_work_sb;
3479 struct reiserfs_journal_list *jl;
3480 struct list_head *entry;
3481
3482 reiserfs_write_lock(sb);
3483 if (!list_empty(&journal->j_journal_list)) {
3484 /* last entry is the youngest, commit it and you get everything */
3485 entry = journal->j_journal_list.prev;
3486 jl = JOURNAL_LIST_ENTRY(entry);
3487 flush_commit_list(sb, jl, 1);
3488 }
3489 reiserfs_write_unlock(sb);
3490}
3491
3492/*
3493** flushes any old transactions to disk
3494** ends the current transaction if it is too old
3495*/
3496void reiserfs_flush_old_commits(struct super_block *sb)
3497{
3498 time_t now;
3499 struct reiserfs_transaction_handle th;
3500 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3501
3502 now = get_seconds();
3503 /* safety check so we don't flush while we are replaying the log during
3504 * mount
3505 */
3506 if (list_empty(&journal->j_journal_list))
3507 return;
3508
3509 /* check the current transaction. If there are no writers, and it is
3510 * too old, finish it, and force the commit blocks to disk
3511 */
3512 if (atomic_read(&journal->j_wcount) <= 0 &&
3513 journal->j_trans_start_time > 0 &&
3514 journal->j_len > 0 &&
3515 (now - journal->j_trans_start_time) > journal->j_max_trans_age) {
3516 if (!journal_join(&th, sb, 1)) {
3517 reiserfs_prepare_for_journal(sb,
3518 SB_BUFFER_WITH_SB(sb),
3519 1);
3520 journal_mark_dirty(&th, sb,
3521 SB_BUFFER_WITH_SB(sb));
3522
3523 /* we're only being called from kreiserfsd, it makes no sense to do
3524 ** an async commit so that kreiserfsd can do it later
3525 */
3526 do_journal_end(&th, sb, 1, COMMIT_NOW | WAIT);
3527 }
3528 }
3529}
3530
3531/*
3532** returns 0 if do_journal_end should return right away, returns 1 if do_journal_end should finish the commit
3533**
3534** if the current transaction is too old, but still has writers, this will wait on j_join_wait until all
3535** the writers are done. By the time it wakes up, the transaction it was called has already ended, so it just
3536** flushes the commit list and returns 0.
3537**
3538** Won't batch when flush or commit_now is set. Also won't batch when others are waiting on j_join_wait.
3539**
3540** Note, we can't allow the journal_end to proceed while there are still writers in the log.
3541*/
3542static int check_journal_end(struct reiserfs_transaction_handle *th,
3543 struct super_block *sb, unsigned long nblocks,
3544 int flags)
3545{
3546
3547 time_t now;
3548 int flush = flags & FLUSH_ALL;
3549 int commit_now = flags & COMMIT_NOW;
3550 int wait_on_commit = flags & WAIT;
3551 struct reiserfs_journal_list *jl;
3552 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3553
3554 BUG_ON(!th->t_trans_id);
3555
3556 if (th->t_trans_id != journal->j_trans_id) {
3557 reiserfs_panic(th->t_super, "journal-1577",
3558 "handle trans id %ld != current trans id %ld",
3559 th->t_trans_id, journal->j_trans_id);
3560 }
3561
3562 journal->j_len_alloc -= (th->t_blocks_allocated - th->t_blocks_logged);
3563 if (atomic_read(&(journal->j_wcount)) > 0) { /* <= 0 is allowed. unmounting might not call begin */
3564 atomic_dec(&(journal->j_wcount));
3565 }
3566
3567 /* BUG, deal with case where j_len is 0, but people previously freed blocks need to be released
3568 ** will be dealt with by next transaction that actually writes something, but should be taken
3569 ** care of in this trans
3570 */
3571 BUG_ON(journal->j_len == 0);
3572
3573 /* if wcount > 0, and we are called to with flush or commit_now,
3574 ** we wait on j_join_wait. We will wake up when the last writer has
3575 ** finished the transaction, and started it on its way to the disk.
3576 ** Then, we flush the commit or journal list, and just return 0
3577 ** because the rest of journal end was already done for this transaction.
3578 */
3579 if (atomic_read(&(journal->j_wcount)) > 0) {
3580 if (flush || commit_now) {
3581 unsigned trans_id;
3582
3583 jl = journal->j_current_jl;
3584 trans_id = jl->j_trans_id;
3585 if (wait_on_commit)
3586 jl->j_state |= LIST_COMMIT_PENDING;
3587 atomic_set(&(journal->j_jlock), 1);
3588 if (flush) {
3589 journal->j_next_full_flush = 1;
3590 }
3591 unlock_journal(sb);
3592
3593 /* sleep while the current transaction is still j_jlocked */
3594 while (journal->j_trans_id == trans_id) {
3595 if (atomic_read(&journal->j_jlock)) {
3596 queue_log_writer(sb);
3597 } else {
3598 lock_journal(sb);
3599 if (journal->j_trans_id == trans_id) {
3600 atomic_set(&(journal->j_jlock),
3601 1);
3602 }
3603 unlock_journal(sb);
3604 }
3605 }
3606 BUG_ON(journal->j_trans_id == trans_id);
3607
3608 if (commit_now
3609 && journal_list_still_alive(sb, trans_id)
3610 && wait_on_commit) {
3611 flush_commit_list(sb, jl, 1);
3612 }
3613 return 0;
3614 }
3615 unlock_journal(sb);
3616 return 0;
3617 }
3618
3619 /* deal with old transactions where we are the last writers */
3620 now = get_seconds();
3621 if ((now - journal->j_trans_start_time) > journal->j_max_trans_age) {
3622 commit_now = 1;
3623 journal->j_next_async_flush = 1;
3624 }
3625 /* don't batch when someone is waiting on j_join_wait */
3626 /* don't batch when syncing the commit or flushing the whole trans */
3627 if (!(journal->j_must_wait > 0) && !(atomic_read(&(journal->j_jlock)))
3628 && !flush && !commit_now && (journal->j_len < journal->j_max_batch)
3629 && journal->j_len_alloc < journal->j_max_batch
3630 && journal->j_cnode_free > (journal->j_trans_max * 3)) {
3631 journal->j_bcount++;
3632 unlock_journal(sb);
3633 return 0;
3634 }
3635
3636 if (journal->j_start > SB_ONDISK_JOURNAL_SIZE(sb)) {
3637 reiserfs_panic(sb, "journal-003",
3638 "j_start (%ld) is too high",
3639 journal->j_start);
3640 }
3641 return 1;
3642}
3643
3644/*
3645** Does all the work that makes deleting blocks safe.
3646** when deleting a block mark BH_JNew, just remove it from the current transaction, clean it's buffer_head and move on.
3647**
3648** otherwise:
3649** set a bit for the block in the journal bitmap. That will prevent it from being allocated for unformatted nodes
3650** before this transaction has finished.
3651**
3652** mark any cnodes for this block as BLOCK_FREED, and clear their bh pointers. That will prevent any old transactions with
3653** this block from trying to flush to the real location. Since we aren't removing the cnode from the journal_list_hash,
3654** the block can't be reallocated yet.
3655**
3656** Then remove it from the current transaction, decrementing any counters and filing it on the clean list.
3657*/
3658int journal_mark_freed(struct reiserfs_transaction_handle *th,
3659 struct super_block *sb, b_blocknr_t blocknr)
3660{
3661 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3662 struct reiserfs_journal_cnode *cn = NULL;
3663 struct buffer_head *bh = NULL;
3664 struct reiserfs_list_bitmap *jb = NULL;
3665 int cleaned = 0;
3666 BUG_ON(!th->t_trans_id);
3667
3668 cn = get_journal_hash_dev(sb, journal->j_hash_table, blocknr);
3669 if (cn && cn->bh) {
3670 bh = cn->bh;
3671 get_bh(bh);
3672 }
3673 /* if it is journal new, we just remove it from this transaction */
3674 if (bh && buffer_journal_new(bh)) {
3675 clear_buffer_journal_new(bh);
3676 clear_prepared_bits(bh);
3677 reiserfs_clean_and_file_buffer(bh);
3678 cleaned = remove_from_transaction(sb, blocknr, cleaned);
3679 } else {
3680 /* set the bit for this block in the journal bitmap for this transaction */
3681 jb = journal->j_current_jl->j_list_bitmap;
3682 if (!jb) {
3683 reiserfs_panic(sb, "journal-1702",
3684 "journal_list_bitmap is NULL");
3685 }
3686 set_bit_in_list_bitmap(sb, blocknr, jb);
3687
3688 /* Note, the entire while loop is not allowed to schedule. */
3689
3690 if (bh) {
3691 clear_prepared_bits(bh);
3692 reiserfs_clean_and_file_buffer(bh);
3693 }
3694 cleaned = remove_from_transaction(sb, blocknr, cleaned);
3695
3696 /* find all older transactions with this block, make sure they don't try to write it out */
3697 cn = get_journal_hash_dev(sb, journal->j_list_hash_table,
3698 blocknr);
3699 while (cn) {
3700 if (sb == cn->sb && blocknr == cn->blocknr) {
3701 set_bit(BLOCK_FREED, &cn->state);
3702 if (cn->bh) {
3703 if (!cleaned) {
3704 /* remove_from_transaction will brelse the buffer if it was
3705 ** in the current trans
3706 */
3707 clear_buffer_journal_dirty(cn->
3708 bh);
3709 clear_buffer_dirty(cn->bh);
3710 clear_buffer_journal_test(cn->
3711 bh);
3712 cleaned = 1;
3713 put_bh(cn->bh);
3714 if (atomic_read
3715 (&(cn->bh->b_count)) < 0) {
3716 reiserfs_warning(sb,
3717 "journal-2138",
3718 "cn->bh->b_count < 0");
3719 }
3720 }
3721 if (cn->jlist) { /* since we are clearing the bh, we MUST dec nonzerolen */
3722 atomic_dec(&
3723 (cn->jlist->
3724 j_nonzerolen));
3725 }
3726 cn->bh = NULL;
3727 }
3728 }
3729 cn = cn->hnext;
3730 }
3731 }
3732
3733 if (bh)
3734 release_buffer_page(bh); /* get_hash grabs the buffer */
3735 return 0;
3736}
3737
3738void reiserfs_update_inode_transaction(struct inode *inode)
3739{
3740 struct reiserfs_journal *journal = SB_JOURNAL(inode->i_sb);
3741 REISERFS_I(inode)->i_jl = journal->j_current_jl;
3742 REISERFS_I(inode)->i_trans_id = journal->j_trans_id;
3743}
3744
3745/*
3746 * returns -1 on error, 0 if no commits/barriers were done and 1
3747 * if a transaction was actually committed and the barrier was done
3748 */
3749static int __commit_trans_jl(struct inode *inode, unsigned long id,
3750 struct reiserfs_journal_list *jl)
3751{
3752 struct reiserfs_transaction_handle th;
3753 struct super_block *sb = inode->i_sb;
3754 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3755 int ret = 0;
3756
3757 /* is it from the current transaction, or from an unknown transaction? */
3758 if (id == journal->j_trans_id) {
3759 jl = journal->j_current_jl;
3760 /* try to let other writers come in and grow this transaction */
3761 let_transaction_grow(sb, id);
3762 if (journal->j_trans_id != id) {
3763 goto flush_commit_only;
3764 }
3765
3766 ret = journal_begin(&th, sb, 1);
3767 if (ret)
3768 return ret;
3769
3770 /* someone might have ended this transaction while we joined */
3771 if (journal->j_trans_id != id) {
3772 reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
3773 1);
3774 journal_mark_dirty(&th, sb, SB_BUFFER_WITH_SB(sb));
3775 ret = journal_end(&th, sb, 1);
3776 goto flush_commit_only;
3777 }
3778
3779 ret = journal_end_sync(&th, sb, 1);
3780 if (!ret)
3781 ret = 1;
3782
3783 } else {
3784 /* this gets tricky, we have to make sure the journal list in
3785 * the inode still exists. We know the list is still around
3786 * if we've got a larger transaction id than the oldest list
3787 */
3788 flush_commit_only:
3789 if (journal_list_still_alive(inode->i_sb, id)) {
3790 /*
3791 * we only set ret to 1 when we know for sure
3792 * the barrier hasn't been started yet on the commit
3793 * block.
3794 */
3795 if (atomic_read(&jl->j_commit_left) > 1)
3796 ret = 1;
3797 flush_commit_list(sb, jl, 1);
3798 if (journal->j_errno)
3799 ret = journal->j_errno;
3800 }
3801 }
3802 /* otherwise the list is gone, and long since committed */
3803 return ret;
3804}
3805
3806int reiserfs_commit_for_inode(struct inode *inode)
3807{
3808 unsigned int id = REISERFS_I(inode)->i_trans_id;
3809 struct reiserfs_journal_list *jl = REISERFS_I(inode)->i_jl;
3810
3811 /* for the whole inode, assume unset id means it was
3812 * changed in the current transaction. More conservative
3813 */
3814 if (!id || !jl) {
3815 reiserfs_update_inode_transaction(inode);
3816 id = REISERFS_I(inode)->i_trans_id;
3817 /* jl will be updated in __commit_trans_jl */
3818 }
3819
3820 return __commit_trans_jl(inode, id, jl);
3821}
3822
3823void reiserfs_restore_prepared_buffer(struct super_block *sb,
3824 struct buffer_head *bh)
3825{
3826 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3827 PROC_INFO_INC(sb, journal.restore_prepared);
3828 if (!bh) {
3829 return;
3830 }
3831 if (test_clear_buffer_journal_restore_dirty(bh) &&
3832 buffer_journal_dirty(bh)) {
3833 struct reiserfs_journal_cnode *cn;
3834 cn = get_journal_hash_dev(sb,
3835 journal->j_list_hash_table,
3836 bh->b_blocknr);
3837 if (cn && can_dirty(cn)) {
3838 set_buffer_journal_test(bh);
3839 mark_buffer_dirty(bh);
3840 }
3841 }
3842 clear_buffer_journal_prepared(bh);
3843}
3844
3845extern struct tree_balance *cur_tb;
3846/*
3847** before we can change a metadata block, we have to make sure it won't
3848** be written to disk while we are altering it. So, we must:
3849** clean it
3850** wait on it.
3851**
3852*/
3853int reiserfs_prepare_for_journal(struct super_block *sb,
3854 struct buffer_head *bh, int wait)
3855{
3856 PROC_INFO_INC(sb, journal.prepare);
3857
3858 if (!trylock_buffer(bh)) {
3859 if (!wait)
3860 return 0;
3861 lock_buffer(bh);
3862 }
3863 set_buffer_journal_prepared(bh);
3864 if (test_clear_buffer_dirty(bh) && buffer_journal_dirty(bh)) {
3865 clear_buffer_journal_test(bh);
3866 set_buffer_journal_restore_dirty(bh);
3867 }
3868 unlock_buffer(bh);
3869 return 1;
3870}
3871
3872static void flush_old_journal_lists(struct super_block *s)
3873{
3874 struct reiserfs_journal *journal = SB_JOURNAL(s);
3875 struct reiserfs_journal_list *jl;
3876 struct list_head *entry;
3877 time_t now = get_seconds();
3878
3879 while (!list_empty(&journal->j_journal_list)) {
3880 entry = journal->j_journal_list.next;
3881 jl = JOURNAL_LIST_ENTRY(entry);
3882 /* this check should always be run, to send old lists to disk */
3883 if (jl->j_timestamp < (now - (JOURNAL_MAX_TRANS_AGE * 4)) &&
3884 atomic_read(&jl->j_commit_left) == 0 &&
3885 test_transaction(s, jl)) {
3886 flush_used_journal_lists(s, jl);
3887 } else {
3888 break;
3889 }
3890 }
3891}
3892
3893/*
3894** long and ugly. If flush, will not return until all commit
3895** blocks and all real buffers in the trans are on disk.
3896** If no_async, won't return until all commit blocks are on disk.
3897**
3898** keep reading, there are comments as you go along
3899**
3900** If the journal is aborted, we just clean up. Things like flushing
3901** journal lists, etc just won't happen.
3902*/
3903static int do_journal_end(struct reiserfs_transaction_handle *th,
3904 struct super_block *sb, unsigned long nblocks,
3905 int flags)
3906{
3907 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3908 struct reiserfs_journal_cnode *cn, *next, *jl_cn;
3909 struct reiserfs_journal_cnode *last_cn = NULL;
3910 struct reiserfs_journal_desc *desc;
3911 struct reiserfs_journal_commit *commit;
3912 struct buffer_head *c_bh; /* commit bh */
3913 struct buffer_head *d_bh; /* desc bh */
3914 int cur_write_start = 0; /* start index of current log write */
3915 int old_start;
3916 int i;
3917 int flush;
3918 int wait_on_commit;
3919 struct reiserfs_journal_list *jl, *temp_jl;
3920 struct list_head *entry, *safe;
3921 unsigned long jindex;
3922 unsigned int commit_trans_id;
3923 int trans_half;
3924
3925 BUG_ON(th->t_refcount > 1);
3926 BUG_ON(!th->t_trans_id);
3927
3928 /* protect flush_older_commits from doing mistakes if the
3929 transaction ID counter gets overflowed. */
3930 if (th->t_trans_id == ~0U)
3931 flags |= FLUSH_ALL | COMMIT_NOW | WAIT;
3932 flush = flags & FLUSH_ALL;
3933 wait_on_commit = flags & WAIT;
3934
3935 current->journal_info = th->t_handle_save;
3936 reiserfs_check_lock_depth(sb, "journal end");
3937 if (journal->j_len == 0) {
3938 reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
3939 1);
3940 journal_mark_dirty(th, sb, SB_BUFFER_WITH_SB(sb));
3941 }
3942
3943 lock_journal(sb);
3944 if (journal->j_next_full_flush) {
3945 flags |= FLUSH_ALL;
3946 flush = 1;
3947 }
3948 if (journal->j_next_async_flush) {
3949 flags |= COMMIT_NOW | WAIT;
3950 wait_on_commit = 1;
3951 }
3952
3953 /* check_journal_end locks the journal, and unlocks if it does not return 1
3954 ** it tells us if we should continue with the journal_end, or just return
3955 */
3956 if (!check_journal_end(th, sb, nblocks, flags)) {
3957 reiserfs_schedule_old_flush(sb);
3958 wake_queued_writers(sb);
3959 reiserfs_async_progress_wait(sb);
3960 goto out;
3961 }
3962
3963 /* check_journal_end might set these, check again */
3964 if (journal->j_next_full_flush) {
3965 flush = 1;
3966 }
3967
3968 /*
3969 ** j must wait means we have to flush the log blocks, and the real blocks for
3970 ** this transaction
3971 */
3972 if (journal->j_must_wait > 0) {
3973 flush = 1;
3974 }
3975#ifdef REISERFS_PREALLOCATE
3976 /* quota ops might need to nest, setup the journal_info pointer for them
3977 * and raise the refcount so that it is > 0. */
3978 current->journal_info = th;
3979 th->t_refcount++;
3980 reiserfs_discard_all_prealloc(th); /* it should not involve new blocks into
3981 * the transaction */
3982 th->t_refcount--;
3983 current->journal_info = th->t_handle_save;
3984#endif
3985
3986 /* setup description block */
3987 d_bh =
3988 journal_getblk(sb,
3989 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
3990 journal->j_start);
3991 set_buffer_uptodate(d_bh);
3992 desc = (struct reiserfs_journal_desc *)(d_bh)->b_data;
3993 memset(d_bh->b_data, 0, d_bh->b_size);
3994 memcpy(get_journal_desc_magic(d_bh), JOURNAL_DESC_MAGIC, 8);
3995 set_desc_trans_id(desc, journal->j_trans_id);
3996
3997 /* setup commit block. Don't write (keep it clean too) this one until after everyone else is written */
3998 c_bh = journal_getblk(sb, SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
3999 ((journal->j_start + journal->j_len +
4000 1) % SB_ONDISK_JOURNAL_SIZE(sb)));
4001 commit = (struct reiserfs_journal_commit *)c_bh->b_data;
4002 memset(c_bh->b_data, 0, c_bh->b_size);
4003 set_commit_trans_id(commit, journal->j_trans_id);
4004 set_buffer_uptodate(c_bh);
4005
4006 /* init this journal list */
4007 jl = journal->j_current_jl;
4008
4009 /* we lock the commit before doing anything because
4010 * we want to make sure nobody tries to run flush_commit_list until
4011 * the new transaction is fully setup, and we've already flushed the
4012 * ordered bh list
4013 */
4014 reiserfs_mutex_lock_safe(&jl->j_commit_mutex, sb);
4015
4016 /* save the transaction id in case we need to commit it later */
4017 commit_trans_id = jl->j_trans_id;
4018
4019 atomic_set(&jl->j_older_commits_done, 0);
4020 jl->j_trans_id = journal->j_trans_id;
4021 jl->j_timestamp = journal->j_trans_start_time;
4022 jl->j_commit_bh = c_bh;
4023 jl->j_start = journal->j_start;
4024 jl->j_len = journal->j_len;
4025 atomic_set(&jl->j_nonzerolen, journal->j_len);
4026 atomic_set(&jl->j_commit_left, journal->j_len + 2);
4027 jl->j_realblock = NULL;
4028
4029 /* The ENTIRE FOR LOOP MUST not cause schedule to occur.
4030 ** for each real block, add it to the journal list hash,
4031 ** copy into real block index array in the commit or desc block
4032 */
4033 trans_half = journal_trans_half(sb->s_blocksize);
4034 for (i = 0, cn = journal->j_first; cn; cn = cn->next, i++) {
4035 if (buffer_journaled(cn->bh)) {
4036 jl_cn = get_cnode(sb);
4037 if (!jl_cn) {
4038 reiserfs_panic(sb, "journal-1676",
4039 "get_cnode returned NULL");
4040 }
4041 if (i == 0) {
4042 jl->j_realblock = jl_cn;
4043 }
4044 jl_cn->prev = last_cn;
4045 jl_cn->next = NULL;
4046 if (last_cn) {
4047 last_cn->next = jl_cn;
4048 }
4049 last_cn = jl_cn;
4050 /* make sure the block we are trying to log is not a block
4051 of journal or reserved area */
4052
4053 if (is_block_in_log_or_reserved_area
4054 (sb, cn->bh->b_blocknr)) {
4055 reiserfs_panic(sb, "journal-2332",
4056 "Trying to log block %lu, "
4057 "which is a log block",
4058 cn->bh->b_blocknr);
4059 }
4060 jl_cn->blocknr = cn->bh->b_blocknr;
4061 jl_cn->state = 0;
4062 jl_cn->sb = sb;
4063 jl_cn->bh = cn->bh;
4064 jl_cn->jlist = jl;
4065 insert_journal_hash(journal->j_list_hash_table, jl_cn);
4066 if (i < trans_half) {
4067 desc->j_realblock[i] =
4068 cpu_to_le32(cn->bh->b_blocknr);
4069 } else {
4070 commit->j_realblock[i - trans_half] =
4071 cpu_to_le32(cn->bh->b_blocknr);
4072 }
4073 } else {
4074 i--;
4075 }
4076 }
4077 set_desc_trans_len(desc, journal->j_len);
4078 set_desc_mount_id(desc, journal->j_mount_id);
4079 set_desc_trans_id(desc, journal->j_trans_id);
4080 set_commit_trans_len(commit, journal->j_len);
4081
4082 /* special check in case all buffers in the journal were marked for not logging */
4083 BUG_ON(journal->j_len == 0);
4084
4085 /* we're about to dirty all the log blocks, mark the description block
4086 * dirty now too. Don't mark the commit block dirty until all the
4087 * others are on disk
4088 */
4089 mark_buffer_dirty(d_bh);
4090
4091 /* first data block is j_start + 1, so add one to cur_write_start wherever you use it */
4092 cur_write_start = journal->j_start;
4093 cn = journal->j_first;
4094 jindex = 1; /* start at one so we don't get the desc again */
4095 while (cn) {
4096 clear_buffer_journal_new(cn->bh);
4097 /* copy all the real blocks into log area. dirty log blocks */
4098 if (buffer_journaled(cn->bh)) {
4099 struct buffer_head *tmp_bh;
4100 char *addr;
4101 struct page *page;
4102 tmp_bh =
4103 journal_getblk(sb,
4104 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
4105 ((cur_write_start +
4106 jindex) %
4107 SB_ONDISK_JOURNAL_SIZE(sb)));
4108 set_buffer_uptodate(tmp_bh);
4109 page = cn->bh->b_page;
4110 addr = kmap(page);
4111 memcpy(tmp_bh->b_data,
4112 addr + offset_in_page(cn->bh->b_data),
4113 cn->bh->b_size);
4114 kunmap(page);
4115 mark_buffer_dirty(tmp_bh);
4116 jindex++;
4117 set_buffer_journal_dirty(cn->bh);
4118 clear_buffer_journaled(cn->bh);
4119 } else {
4120 /* JDirty cleared sometime during transaction. don't log this one */
4121 reiserfs_warning(sb, "journal-2048",
4122 "BAD, buffer in journal hash, "
4123 "but not JDirty!");
4124 brelse(cn->bh);
4125 }
4126 next = cn->next;
4127 free_cnode(sb, cn);
4128 cn = next;
4129 reiserfs_write_unlock(sb);
4130 cond_resched();
4131 reiserfs_write_lock(sb);
4132 }
4133
4134 /* we are done with both the c_bh and d_bh, but
4135 ** c_bh must be written after all other commit blocks,
4136 ** so we dirty/relse c_bh in flush_commit_list, with commit_left <= 1.
4137 */
4138
4139 journal->j_current_jl = alloc_journal_list(sb);
4140
4141 /* now it is safe to insert this transaction on the main list */
4142 list_add_tail(&jl->j_list, &journal->j_journal_list);
4143 list_add_tail(&jl->j_working_list, &journal->j_working_list);
4144 journal->j_num_work_lists++;
4145
4146 /* reset journal values for the next transaction */
4147 old_start = journal->j_start;
4148 journal->j_start =
4149 (journal->j_start + journal->j_len +
4150 2) % SB_ONDISK_JOURNAL_SIZE(sb);
4151 atomic_set(&(journal->j_wcount), 0);
4152 journal->j_bcount = 0;
4153 journal->j_last = NULL;
4154 journal->j_first = NULL;
4155 journal->j_len = 0;
4156 journal->j_trans_start_time = 0;
4157 /* check for trans_id overflow */
4158 if (++journal->j_trans_id == 0)
4159 journal->j_trans_id = 10;
4160 journal->j_current_jl->j_trans_id = journal->j_trans_id;
4161 journal->j_must_wait = 0;
4162 journal->j_len_alloc = 0;
4163 journal->j_next_full_flush = 0;
4164 journal->j_next_async_flush = 0;
4165 init_journal_hash(sb);
4166
4167 // make sure reiserfs_add_jh sees the new current_jl before we
4168 // write out the tails
4169 smp_mb();
4170
4171 /* tail conversion targets have to hit the disk before we end the
4172 * transaction. Otherwise a later transaction might repack the tail
4173 * before this transaction commits, leaving the data block unflushed and
4174 * clean, if we crash before the later transaction commits, the data block
4175 * is lost.
4176 */
4177 if (!list_empty(&jl->j_tail_bh_list)) {
4178 reiserfs_write_unlock(sb);
4179 write_ordered_buffers(&journal->j_dirty_buffers_lock,
4180 journal, jl, &jl->j_tail_bh_list);
4181 reiserfs_write_lock(sb);
4182 }
4183 BUG_ON(!list_empty(&jl->j_tail_bh_list));
4184 mutex_unlock(&jl->j_commit_mutex);
4185
4186 /* honor the flush wishes from the caller, simple commits can
4187 ** be done outside the journal lock, they are done below
4188 **
4189 ** if we don't flush the commit list right now, we put it into
4190 ** the work queue so the people waiting on the async progress work
4191 ** queue don't wait for this proc to flush journal lists and such.
4192 */
4193 if (flush) {
4194 flush_commit_list(sb, jl, 1);
4195 flush_journal_list(sb, jl, 1);
4196 } else if (!(jl->j_state & LIST_COMMIT_PENDING))
4197 queue_delayed_work(commit_wq, &journal->j_work, HZ / 10);
4198
4199 /* if the next transaction has any chance of wrapping, flush
4200 ** transactions that might get overwritten. If any journal lists are very
4201 ** old flush them as well.
4202 */
4203 first_jl:
4204 list_for_each_safe(entry, safe, &journal->j_journal_list) {
4205 temp_jl = JOURNAL_LIST_ENTRY(entry);
4206 if (journal->j_start <= temp_jl->j_start) {
4207 if ((journal->j_start + journal->j_trans_max + 1) >=
4208 temp_jl->j_start) {
4209 flush_used_journal_lists(sb, temp_jl);
4210 goto first_jl;
4211 } else if ((journal->j_start +
4212 journal->j_trans_max + 1) <
4213 SB_ONDISK_JOURNAL_SIZE(sb)) {
4214 /* if we don't cross into the next transaction and we don't
4215 * wrap, there is no way we can overlap any later transactions
4216 * break now
4217 */
4218 break;
4219 }
4220 } else if ((journal->j_start +
4221 journal->j_trans_max + 1) >
4222 SB_ONDISK_JOURNAL_SIZE(sb)) {
4223 if (((journal->j_start + journal->j_trans_max + 1) %
4224 SB_ONDISK_JOURNAL_SIZE(sb)) >=
4225 temp_jl->j_start) {
4226 flush_used_journal_lists(sb, temp_jl);
4227 goto first_jl;
4228 } else {
4229 /* we don't overlap anything from out start to the end of the
4230 * log, and our wrapped portion doesn't overlap anything at
4231 * the start of the log. We can break
4232 */
4233 break;
4234 }
4235 }
4236 }
4237 flush_old_journal_lists(sb);
4238
4239 journal->j_current_jl->j_list_bitmap =
4240 get_list_bitmap(sb, journal->j_current_jl);
4241
4242 if (!(journal->j_current_jl->j_list_bitmap)) {
4243 reiserfs_panic(sb, "journal-1996",
4244 "could not get a list bitmap");
4245 }
4246
4247 atomic_set(&(journal->j_jlock), 0);
4248 unlock_journal(sb);
4249 /* wake up any body waiting to join. */
4250 clear_bit(J_WRITERS_QUEUED, &journal->j_state);
4251 wake_up(&(journal->j_join_wait));
4252
4253 if (!flush && wait_on_commit &&
4254 journal_list_still_alive(sb, commit_trans_id)) {
4255 flush_commit_list(sb, jl, 1);
4256 }
4257 out:
4258 reiserfs_check_lock_depth(sb, "journal end2");
4259
4260 memset(th, 0, sizeof(*th));
4261 /* Re-set th->t_super, so we can properly keep track of how many
4262 * persistent transactions there are. We need to do this so if this
4263 * call is part of a failed restart_transaction, we can free it later */
4264 th->t_super = sb;
4265
4266 return journal->j_errno;
4267}
4268
4269/* Send the file system read only and refuse new transactions */
4270void reiserfs_abort_journal(struct super_block *sb, int errno)
4271{
4272 struct reiserfs_journal *journal = SB_JOURNAL(sb);
4273 if (test_bit(J_ABORTED, &journal->j_state))
4274 return;
4275
4276 if (!journal->j_errno)
4277 journal->j_errno = errno;
4278
4279 sb->s_flags |= MS_RDONLY;
4280 set_bit(J_ABORTED, &journal->j_state);
4281
4282#ifdef CONFIG_REISERFS_CHECK
4283 dump_stack();
4284#endif
4285}