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1/*
2 * Write ahead logging implementation copyright Chris Mason 2000
3 *
4 * The background commits make this code very interrelated, and
5 * overly complex. I need to rethink things a bit....The major players:
6 *
7 * journal_begin -- call with the number of blocks you expect to log.
8 * If the current transaction is too
9 * old, it will block until the current transaction is
10 * finished, and then start a new one.
11 * Usually, your transaction will get joined in with
12 * previous ones for speed.
13 *
14 * journal_join -- same as journal_begin, but won't block on the current
15 * transaction regardless of age. Don't ever call
16 * this. Ever. There are only two places it should be
17 * called from, and they are both inside this file.
18 *
19 * journal_mark_dirty -- adds blocks into this transaction. clears any flags
20 * that might make them get sent to disk
21 * and then marks them BH_JDirty. Puts the buffer head
22 * into the current transaction hash.
23 *
24 * journal_end -- if the current transaction is batchable, it does nothing
25 * otherwise, it could do an async/synchronous commit, or
26 * a full flush of all log and real blocks in the
27 * transaction.
28 *
29 * flush_old_commits -- if the current transaction is too old, it is ended and
30 * commit blocks are sent to disk. Forces commit blocks
31 * to disk for all backgrounded commits that have been
32 * around too long.
33 * -- Note, if you call this as an immediate flush from
34 * from within kupdate, it will ignore the immediate flag
35 */
36
37#include <linux/time.h>
38#include <linux/semaphore.h>
39#include <linux/vmalloc.h>
40#include "reiserfs.h"
41#include <linux/kernel.h>
42#include <linux/errno.h>
43#include <linux/fcntl.h>
44#include <linux/stat.h>
45#include <linux/string.h>
46#include <linux/buffer_head.h>
47#include <linux/workqueue.h>
48#include <linux/writeback.h>
49#include <linux/blkdev.h>
50#include <linux/backing-dev.h>
51#include <linux/uaccess.h>
52#include <linux/slab.h>
53
54
55/* gets a struct reiserfs_journal_list * from a list head */
56#define JOURNAL_LIST_ENTRY(h) (list_entry((h), struct reiserfs_journal_list, \
57 j_list))
58#define JOURNAL_WORK_ENTRY(h) (list_entry((h), struct reiserfs_journal_list, \
59 j_working_list))
60
61/* must be correct to keep the desc and commit structs at 4k */
62#define JOURNAL_TRANS_HALF 1018
63#define BUFNR 64 /*read ahead */
64
65/* cnode stat bits. Move these into reiserfs_fs.h */
66
67/* this block was freed, and can't be written. */
68#define BLOCK_FREED 2
69/* this block was freed during this transaction, and can't be written */
70#define BLOCK_FREED_HOLDER 3
71
72/* used in flush_journal_list */
73#define BLOCK_NEEDS_FLUSH 4
74#define BLOCK_DIRTIED 5
75
76/* journal list state bits */
77#define LIST_TOUCHED 1
78#define LIST_DIRTY 2
79#define LIST_COMMIT_PENDING 4 /* someone will commit this list */
80
81/* flags for do_journal_end */
82#define FLUSH_ALL 1 /* flush commit and real blocks */
83#define COMMIT_NOW 2 /* end and commit this transaction */
84#define WAIT 4 /* wait for the log blocks to hit the disk */
85
86static int do_journal_end(struct reiserfs_transaction_handle *, int flags);
87static int flush_journal_list(struct super_block *s,
88 struct reiserfs_journal_list *jl, int flushall);
89static int flush_commit_list(struct super_block *s,
90 struct reiserfs_journal_list *jl, int flushall);
91static int can_dirty(struct reiserfs_journal_cnode *cn);
92static int journal_join(struct reiserfs_transaction_handle *th,
93 struct super_block *sb);
94static void release_journal_dev(struct super_block *super,
95 struct reiserfs_journal *journal);
96static int dirty_one_transaction(struct super_block *s,
97 struct reiserfs_journal_list *jl);
98static void flush_async_commits(struct work_struct *work);
99static void queue_log_writer(struct super_block *s);
100
101/* values for join in do_journal_begin_r */
102enum {
103 JBEGIN_REG = 0, /* regular journal begin */
104 /* join the running transaction if at all possible */
105 JBEGIN_JOIN = 1,
106 /* called from cleanup code, ignores aborted flag */
107 JBEGIN_ABORT = 2,
108};
109
110static int do_journal_begin_r(struct reiserfs_transaction_handle *th,
111 struct super_block *sb,
112 unsigned long nblocks, int join);
113
114static void init_journal_hash(struct super_block *sb)
115{
116 struct reiserfs_journal *journal = SB_JOURNAL(sb);
117 memset(journal->j_hash_table, 0,
118 JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *));
119}
120
121/*
122 * clears BH_Dirty and sticks the buffer on the clean list. Called because
123 * I can't allow refile_buffer to make schedule happen after I've freed a
124 * block. Look at remove_from_transaction and journal_mark_freed for
125 * more details.
126 */
127static int reiserfs_clean_and_file_buffer(struct buffer_head *bh)
128{
129 if (bh) {
130 clear_buffer_dirty(bh);
131 clear_buffer_journal_test(bh);
132 }
133 return 0;
134}
135
136static struct reiserfs_bitmap_node *allocate_bitmap_node(struct super_block
137 *sb)
138{
139 struct reiserfs_bitmap_node *bn;
140 static int id;
141
142 bn = kmalloc(sizeof(struct reiserfs_bitmap_node), GFP_NOFS);
143 if (!bn) {
144 return NULL;
145 }
146 bn->data = kzalloc(sb->s_blocksize, GFP_NOFS);
147 if (!bn->data) {
148 kfree(bn);
149 return NULL;
150 }
151 bn->id = id++;
152 INIT_LIST_HEAD(&bn->list);
153 return bn;
154}
155
156static struct reiserfs_bitmap_node *get_bitmap_node(struct super_block *sb)
157{
158 struct reiserfs_journal *journal = SB_JOURNAL(sb);
159 struct reiserfs_bitmap_node *bn = NULL;
160 struct list_head *entry = journal->j_bitmap_nodes.next;
161
162 journal->j_used_bitmap_nodes++;
163repeat:
164
165 if (entry != &journal->j_bitmap_nodes) {
166 bn = list_entry(entry, struct reiserfs_bitmap_node, list);
167 list_del(entry);
168 memset(bn->data, 0, sb->s_blocksize);
169 journal->j_free_bitmap_nodes--;
170 return bn;
171 }
172 bn = allocate_bitmap_node(sb);
173 if (!bn) {
174 yield();
175 goto repeat;
176 }
177 return bn;
178}
179static inline void free_bitmap_node(struct super_block *sb,
180 struct reiserfs_bitmap_node *bn)
181{
182 struct reiserfs_journal *journal = SB_JOURNAL(sb);
183 journal->j_used_bitmap_nodes--;
184 if (journal->j_free_bitmap_nodes > REISERFS_MAX_BITMAP_NODES) {
185 kfree(bn->data);
186 kfree(bn);
187 } else {
188 list_add(&bn->list, &journal->j_bitmap_nodes);
189 journal->j_free_bitmap_nodes++;
190 }
191}
192
193static void allocate_bitmap_nodes(struct super_block *sb)
194{
195 int i;
196 struct reiserfs_journal *journal = SB_JOURNAL(sb);
197 struct reiserfs_bitmap_node *bn = NULL;
198 for (i = 0; i < REISERFS_MIN_BITMAP_NODES; i++) {
199 bn = allocate_bitmap_node(sb);
200 if (bn) {
201 list_add(&bn->list, &journal->j_bitmap_nodes);
202 journal->j_free_bitmap_nodes++;
203 } else {
204 /* this is ok, we'll try again when more are needed */
205 break;
206 }
207 }
208}
209
210static int set_bit_in_list_bitmap(struct super_block *sb,
211 b_blocknr_t block,
212 struct reiserfs_list_bitmap *jb)
213{
214 unsigned int bmap_nr = block / (sb->s_blocksize << 3);
215 unsigned int bit_nr = block % (sb->s_blocksize << 3);
216
217 if (!jb->bitmaps[bmap_nr]) {
218 jb->bitmaps[bmap_nr] = get_bitmap_node(sb);
219 }
220 set_bit(bit_nr, (unsigned long *)jb->bitmaps[bmap_nr]->data);
221 return 0;
222}
223
224static void cleanup_bitmap_list(struct super_block *sb,
225 struct reiserfs_list_bitmap *jb)
226{
227 int i;
228 if (jb->bitmaps == NULL)
229 return;
230
231 for (i = 0; i < reiserfs_bmap_count(sb); i++) {
232 if (jb->bitmaps[i]) {
233 free_bitmap_node(sb, jb->bitmaps[i]);
234 jb->bitmaps[i] = NULL;
235 }
236 }
237}
238
239/*
240 * only call this on FS unmount.
241 */
242static int free_list_bitmaps(struct super_block *sb,
243 struct reiserfs_list_bitmap *jb_array)
244{
245 int i;
246 struct reiserfs_list_bitmap *jb;
247 for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
248 jb = jb_array + i;
249 jb->journal_list = NULL;
250 cleanup_bitmap_list(sb, jb);
251 vfree(jb->bitmaps);
252 jb->bitmaps = NULL;
253 }
254 return 0;
255}
256
257static int free_bitmap_nodes(struct super_block *sb)
258{
259 struct reiserfs_journal *journal = SB_JOURNAL(sb);
260 struct list_head *next = journal->j_bitmap_nodes.next;
261 struct reiserfs_bitmap_node *bn;
262
263 while (next != &journal->j_bitmap_nodes) {
264 bn = list_entry(next, struct reiserfs_bitmap_node, list);
265 list_del(next);
266 kfree(bn->data);
267 kfree(bn);
268 next = journal->j_bitmap_nodes.next;
269 journal->j_free_bitmap_nodes--;
270 }
271
272 return 0;
273}
274
275/*
276 * get memory for JOURNAL_NUM_BITMAPS worth of bitmaps.
277 * jb_array is the array to be filled in.
278 */
279int reiserfs_allocate_list_bitmaps(struct super_block *sb,
280 struct reiserfs_list_bitmap *jb_array,
281 unsigned int bmap_nr)
282{
283 int i;
284 int failed = 0;
285 struct reiserfs_list_bitmap *jb;
286 int mem = bmap_nr * sizeof(struct reiserfs_bitmap_node *);
287
288 for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
289 jb = jb_array + i;
290 jb->journal_list = NULL;
291 jb->bitmaps = vzalloc(mem);
292 if (!jb->bitmaps) {
293 reiserfs_warning(sb, "clm-2000", "unable to "
294 "allocate bitmaps for journal lists");
295 failed = 1;
296 break;
297 }
298 }
299 if (failed) {
300 free_list_bitmaps(sb, jb_array);
301 return -1;
302 }
303 return 0;
304}
305
306/*
307 * find an available list bitmap. If you can't find one, flush a commit list
308 * and try again
309 */
310static struct reiserfs_list_bitmap *get_list_bitmap(struct super_block *sb,
311 struct reiserfs_journal_list
312 *jl)
313{
314 int i, j;
315 struct reiserfs_journal *journal = SB_JOURNAL(sb);
316 struct reiserfs_list_bitmap *jb = NULL;
317
318 for (j = 0; j < (JOURNAL_NUM_BITMAPS * 3); j++) {
319 i = journal->j_list_bitmap_index;
320 journal->j_list_bitmap_index = (i + 1) % JOURNAL_NUM_BITMAPS;
321 jb = journal->j_list_bitmap + i;
322 if (journal->j_list_bitmap[i].journal_list) {
323 flush_commit_list(sb,
324 journal->j_list_bitmap[i].
325 journal_list, 1);
326 if (!journal->j_list_bitmap[i].journal_list) {
327 break;
328 }
329 } else {
330 break;
331 }
332 }
333 /* double check to make sure if flushed correctly */
334 if (jb->journal_list)
335 return NULL;
336 jb->journal_list = jl;
337 return jb;
338}
339
340/*
341 * allocates a new chunk of X nodes, and links them all together as a list.
342 * Uses the cnode->next and cnode->prev pointers
343 * returns NULL on failure
344 */
345static struct reiserfs_journal_cnode *allocate_cnodes(int num_cnodes)
346{
347 struct reiserfs_journal_cnode *head;
348 int i;
349 if (num_cnodes <= 0) {
350 return NULL;
351 }
352 head = vzalloc(num_cnodes * sizeof(struct reiserfs_journal_cnode));
353 if (!head) {
354 return NULL;
355 }
356 head[0].prev = NULL;
357 head[0].next = head + 1;
358 for (i = 1; i < num_cnodes; i++) {
359 head[i].prev = head + (i - 1);
360 head[i].next = head + (i + 1); /* if last one, overwrite it after the if */
361 }
362 head[num_cnodes - 1].next = NULL;
363 return head;
364}
365
366/* pulls a cnode off the free list, or returns NULL on failure */
367static struct reiserfs_journal_cnode *get_cnode(struct super_block *sb)
368{
369 struct reiserfs_journal_cnode *cn;
370 struct reiserfs_journal *journal = SB_JOURNAL(sb);
371
372 reiserfs_check_lock_depth(sb, "get_cnode");
373
374 if (journal->j_cnode_free <= 0) {
375 return NULL;
376 }
377 journal->j_cnode_used++;
378 journal->j_cnode_free--;
379 cn = journal->j_cnode_free_list;
380 if (!cn) {
381 return cn;
382 }
383 if (cn->next) {
384 cn->next->prev = NULL;
385 }
386 journal->j_cnode_free_list = cn->next;
387 memset(cn, 0, sizeof(struct reiserfs_journal_cnode));
388 return cn;
389}
390
391/*
392 * returns a cnode to the free list
393 */
394static void free_cnode(struct super_block *sb,
395 struct reiserfs_journal_cnode *cn)
396{
397 struct reiserfs_journal *journal = SB_JOURNAL(sb);
398
399 reiserfs_check_lock_depth(sb, "free_cnode");
400
401 journal->j_cnode_used--;
402 journal->j_cnode_free++;
403 /* memset(cn, 0, sizeof(struct reiserfs_journal_cnode)) ; */
404 cn->next = journal->j_cnode_free_list;
405 if (journal->j_cnode_free_list) {
406 journal->j_cnode_free_list->prev = cn;
407 }
408 cn->prev = NULL; /* not needed with the memset, but I might kill the memset, and forget to do this */
409 journal->j_cnode_free_list = cn;
410}
411
412static void clear_prepared_bits(struct buffer_head *bh)
413{
414 clear_buffer_journal_prepared(bh);
415 clear_buffer_journal_restore_dirty(bh);
416}
417
418/*
419 * return a cnode with same dev, block number and size in table,
420 * or null if not found
421 */
422static inline struct reiserfs_journal_cnode *get_journal_hash_dev(struct
423 super_block
424 *sb,
425 struct
426 reiserfs_journal_cnode
427 **table,
428 long bl)
429{
430 struct reiserfs_journal_cnode *cn;
431 cn = journal_hash(table, sb, bl);
432 while (cn) {
433 if (cn->blocknr == bl && cn->sb == sb)
434 return cn;
435 cn = cn->hnext;
436 }
437 return (struct reiserfs_journal_cnode *)0;
438}
439
440/*
441 * this actually means 'can this block be reallocated yet?'. If you set
442 * search_all, a block can only be allocated if it is not in the current
443 * transaction, was not freed by the current transaction, and has no chance
444 * of ever being overwritten by a replay after crashing.
445 *
446 * If you don't set search_all, a block can only be allocated if it is not
447 * in the current transaction. Since deleting a block removes it from the
448 * current transaction, this case should never happen. If you don't set
449 * search_all, make sure you never write the block without logging it.
450 *
451 * next_zero_bit is a suggestion about the next block to try for find_forward.
452 * when bl is rejected because it is set in a journal list bitmap, we search
453 * for the next zero bit in the bitmap that rejected bl. Then, we return
454 * that through next_zero_bit for find_forward to try.
455 *
456 * Just because we return something in next_zero_bit does not mean we won't
457 * reject it on the next call to reiserfs_in_journal
458 */
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 /*
473 * If we aren't doing a search_all, this is a metablock, and it
474 * will be logged before use. if we crash before the transaction
475 * that freed it commits, this transaction won't have committed
476 * either, and the block will never be written
477 */
478 if (search_all) {
479 for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
480 PROC_INFO_INC(sb, journal.in_journal_bitmap);
481 jb = journal->j_list_bitmap + i;
482 if (jb->journal_list && jb->bitmaps[bmap_nr] &&
483 test_bit(bit_nr,
484 (unsigned long *)jb->bitmaps[bmap_nr]->
485 data)) {
486 *next_zero_bit =
487 find_next_zero_bit((unsigned long *)
488 (jb->bitmaps[bmap_nr]->
489 data),
490 sb->s_blocksize << 3,
491 bit_nr + 1);
492 return 1;
493 }
494 }
495 }
496
497 bl = bmap_nr * (sb->s_blocksize << 3) + bit_nr;
498 /* is it in any old transactions? */
499 if (search_all
500 && (cn =
501 get_journal_hash_dev(sb, journal->j_list_hash_table, bl))) {
502 return 1;
503 }
504
505 /* is it in the current transaction. This should never happen */
506 if ((cn = get_journal_hash_dev(sb, journal->j_hash_table, bl))) {
507 BUG();
508 return 1;
509 }
510
511 PROC_INFO_INC(sb, journal.in_journal_reusable);
512 /* safe for reuse */
513 return 0;
514}
515
516/* insert cn into table */
517static inline void insert_journal_hash(struct reiserfs_journal_cnode **table,
518 struct reiserfs_journal_cnode *cn)
519{
520 struct reiserfs_journal_cnode *cn_orig;
521
522 cn_orig = journal_hash(table, cn->sb, cn->blocknr);
523 cn->hnext = cn_orig;
524 cn->hprev = NULL;
525 if (cn_orig) {
526 cn_orig->hprev = cn;
527 }
528 journal_hash(table, cn->sb, cn->blocknr) = cn;
529}
530
531/* lock the current transaction */
532static inline void lock_journal(struct super_block *sb)
533{
534 PROC_INFO_INC(sb, journal.lock_journal);
535
536 reiserfs_mutex_lock_safe(&SB_JOURNAL(sb)->j_mutex, sb);
537}
538
539/* unlock the current transaction */
540static inline void unlock_journal(struct super_block *sb)
541{
542 mutex_unlock(&SB_JOURNAL(sb)->j_mutex);
543}
544
545static inline void get_journal_list(struct reiserfs_journal_list *jl)
546{
547 jl->j_refcount++;
548}
549
550static inline void put_journal_list(struct super_block *s,
551 struct reiserfs_journal_list *jl)
552{
553 if (jl->j_refcount < 1) {
554 reiserfs_panic(s, "journal-2", "trans id %u, refcount at %d",
555 jl->j_trans_id, jl->j_refcount);
556 }
557 if (--jl->j_refcount == 0)
558 kfree(jl);
559}
560
561/*
562 * this used to be much more involved, and I'm keeping it just in case
563 * things get ugly again. it gets called by flush_commit_list, and
564 * cleans up any data stored about blocks freed during a transaction.
565 */
566static void cleanup_freed_for_journal_list(struct super_block *sb,
567 struct reiserfs_journal_list *jl)
568{
569
570 struct reiserfs_list_bitmap *jb = jl->j_list_bitmap;
571 if (jb) {
572 cleanup_bitmap_list(sb, jb);
573 }
574 jl->j_list_bitmap->journal_list = NULL;
575 jl->j_list_bitmap = NULL;
576}
577
578static int journal_list_still_alive(struct super_block *s,
579 unsigned int trans_id)
580{
581 struct reiserfs_journal *journal = SB_JOURNAL(s);
582 struct list_head *entry = &journal->j_journal_list;
583 struct reiserfs_journal_list *jl;
584
585 if (!list_empty(entry)) {
586 jl = JOURNAL_LIST_ENTRY(entry->next);
587 if (jl->j_trans_id <= trans_id) {
588 return 1;
589 }
590 }
591 return 0;
592}
593
594/*
595 * If page->mapping was null, we failed to truncate this page for
596 * some reason. Most likely because it was truncated after being
597 * logged via data=journal.
598 *
599 * This does a check to see if the buffer belongs to one of these
600 * lost pages before doing the final put_bh. If page->mapping was
601 * null, it tries to free buffers on the page, which should make the
602 * final put_page drop the page from the lru.
603 */
604static void release_buffer_page(struct buffer_head *bh)
605{
606 struct page *page = bh->b_page;
607 if (!page->mapping && trylock_page(page)) {
608 get_page(page);
609 put_bh(bh);
610 if (!page->mapping)
611 try_to_free_buffers(page);
612 unlock_page(page);
613 put_page(page);
614 } else {
615 put_bh(bh);
616 }
617}
618
619static void reiserfs_end_buffer_io_sync(struct buffer_head *bh, int uptodate)
620{
621 if (buffer_journaled(bh)) {
622 reiserfs_warning(NULL, "clm-2084",
623 "pinned buffer %lu:%pg sent to disk",
624 bh->b_blocknr, bh->b_bdev);
625 }
626 if (uptodate)
627 set_buffer_uptodate(bh);
628 else
629 clear_buffer_uptodate(bh);
630
631 unlock_buffer(bh);
632 release_buffer_page(bh);
633}
634
635static void reiserfs_end_ordered_io(struct buffer_head *bh, int uptodate)
636{
637 if (uptodate)
638 set_buffer_uptodate(bh);
639 else
640 clear_buffer_uptodate(bh);
641 unlock_buffer(bh);
642 put_bh(bh);
643}
644
645static void submit_logged_buffer(struct buffer_head *bh)
646{
647 get_bh(bh);
648 bh->b_end_io = reiserfs_end_buffer_io_sync;
649 clear_buffer_journal_new(bh);
650 clear_buffer_dirty(bh);
651 if (!test_clear_buffer_journal_test(bh))
652 BUG();
653 if (!buffer_uptodate(bh))
654 BUG();
655 submit_bh(WRITE, bh);
656}
657
658static void submit_ordered_buffer(struct buffer_head *bh)
659{
660 get_bh(bh);
661 bh->b_end_io = reiserfs_end_ordered_io;
662 clear_buffer_dirty(bh);
663 if (!buffer_uptodate(bh))
664 BUG();
665 submit_bh(WRITE, bh);
666}
667
668#define CHUNK_SIZE 32
669struct buffer_chunk {
670 struct buffer_head *bh[CHUNK_SIZE];
671 int nr;
672};
673
674static void write_chunk(struct buffer_chunk *chunk)
675{
676 int i;
677 for (i = 0; i < chunk->nr; i++) {
678 submit_logged_buffer(chunk->bh[i]);
679 }
680 chunk->nr = 0;
681}
682
683static void write_ordered_chunk(struct buffer_chunk *chunk)
684{
685 int i;
686 for (i = 0; i < chunk->nr; i++) {
687 submit_ordered_buffer(chunk->bh[i]);
688 }
689 chunk->nr = 0;
690}
691
692static int add_to_chunk(struct buffer_chunk *chunk, struct buffer_head *bh,
693 spinlock_t * lock, void (fn) (struct buffer_chunk *))
694{
695 int ret = 0;
696 BUG_ON(chunk->nr >= CHUNK_SIZE);
697 chunk->bh[chunk->nr++] = bh;
698 if (chunk->nr >= CHUNK_SIZE) {
699 ret = 1;
700 if (lock) {
701 spin_unlock(lock);
702 fn(chunk);
703 spin_lock(lock);
704 } else {
705 fn(chunk);
706 }
707 }
708 return ret;
709}
710
711static atomic_t nr_reiserfs_jh = ATOMIC_INIT(0);
712static struct reiserfs_jh *alloc_jh(void)
713{
714 struct reiserfs_jh *jh;
715 while (1) {
716 jh = kmalloc(sizeof(*jh), GFP_NOFS);
717 if (jh) {
718 atomic_inc(&nr_reiserfs_jh);
719 return jh;
720 }
721 yield();
722 }
723}
724
725/*
726 * we want to free the jh when the buffer has been written
727 * and waited on
728 */
729void reiserfs_free_jh(struct buffer_head *bh)
730{
731 struct reiserfs_jh *jh;
732
733 jh = bh->b_private;
734 if (jh) {
735 bh->b_private = NULL;
736 jh->bh = NULL;
737 list_del_init(&jh->list);
738 kfree(jh);
739 if (atomic_read(&nr_reiserfs_jh) <= 0)
740 BUG();
741 atomic_dec(&nr_reiserfs_jh);
742 put_bh(bh);
743 }
744}
745
746static inline int __add_jh(struct reiserfs_journal *j, struct buffer_head *bh,
747 int tail)
748{
749 struct reiserfs_jh *jh;
750
751 if (bh->b_private) {
752 spin_lock(&j->j_dirty_buffers_lock);
753 if (!bh->b_private) {
754 spin_unlock(&j->j_dirty_buffers_lock);
755 goto no_jh;
756 }
757 jh = bh->b_private;
758 list_del_init(&jh->list);
759 } else {
760no_jh:
761 get_bh(bh);
762 jh = alloc_jh();
763 spin_lock(&j->j_dirty_buffers_lock);
764 /*
765 * buffer must be locked for __add_jh, should be able to have
766 * two adds at the same time
767 */
768 BUG_ON(bh->b_private);
769 jh->bh = bh;
770 bh->b_private = jh;
771 }
772 jh->jl = j->j_current_jl;
773 if (tail)
774 list_add_tail(&jh->list, &jh->jl->j_tail_bh_list);
775 else {
776 list_add_tail(&jh->list, &jh->jl->j_bh_list);
777 }
778 spin_unlock(&j->j_dirty_buffers_lock);
779 return 0;
780}
781
782int reiserfs_add_tail_list(struct inode *inode, struct buffer_head *bh)
783{
784 return __add_jh(SB_JOURNAL(inode->i_sb), bh, 1);
785}
786int reiserfs_add_ordered_list(struct inode *inode, struct buffer_head *bh)
787{
788 return __add_jh(SB_JOURNAL(inode->i_sb), bh, 0);
789}
790
791#define JH_ENTRY(l) list_entry((l), struct reiserfs_jh, list)
792static int write_ordered_buffers(spinlock_t * lock,
793 struct reiserfs_journal *j,
794 struct reiserfs_journal_list *jl,
795 struct list_head *list)
796{
797 struct buffer_head *bh;
798 struct reiserfs_jh *jh;
799 int ret = j->j_errno;
800 struct buffer_chunk chunk;
801 struct list_head tmp;
802 INIT_LIST_HEAD(&tmp);
803
804 chunk.nr = 0;
805 spin_lock(lock);
806 while (!list_empty(list)) {
807 jh = JH_ENTRY(list->next);
808 bh = jh->bh;
809 get_bh(bh);
810 if (!trylock_buffer(bh)) {
811 if (!buffer_dirty(bh)) {
812 list_move(&jh->list, &tmp);
813 goto loop_next;
814 }
815 spin_unlock(lock);
816 if (chunk.nr)
817 write_ordered_chunk(&chunk);
818 wait_on_buffer(bh);
819 cond_resched();
820 spin_lock(lock);
821 goto loop_next;
822 }
823 /*
824 * in theory, dirty non-uptodate buffers should never get here,
825 * but the upper layer io error paths still have a few quirks.
826 * Handle them here as gracefully as we can
827 */
828 if (!buffer_uptodate(bh) && buffer_dirty(bh)) {
829 clear_buffer_dirty(bh);
830 ret = -EIO;
831 }
832 if (buffer_dirty(bh)) {
833 list_move(&jh->list, &tmp);
834 add_to_chunk(&chunk, bh, lock, write_ordered_chunk);
835 } else {
836 reiserfs_free_jh(bh);
837 unlock_buffer(bh);
838 }
839loop_next:
840 put_bh(bh);
841 cond_resched_lock(lock);
842 }
843 if (chunk.nr) {
844 spin_unlock(lock);
845 write_ordered_chunk(&chunk);
846 spin_lock(lock);
847 }
848 while (!list_empty(&tmp)) {
849 jh = JH_ENTRY(tmp.prev);
850 bh = jh->bh;
851 get_bh(bh);
852 reiserfs_free_jh(bh);
853
854 if (buffer_locked(bh)) {
855 spin_unlock(lock);
856 wait_on_buffer(bh);
857 spin_lock(lock);
858 }
859 if (!buffer_uptodate(bh)) {
860 ret = -EIO;
861 }
862 /*
863 * ugly interaction with invalidatepage here.
864 * reiserfs_invalidate_page will pin any buffer that has a
865 * valid journal head from an older transaction. If someone
866 * else sets our buffer dirty after we write it in the first
867 * loop, and then someone truncates the page away, nobody
868 * will ever write the buffer. We're safe if we write the
869 * page one last time after freeing the journal header.
870 */
871 if (buffer_dirty(bh) && unlikely(bh->b_page->mapping == NULL)) {
872 spin_unlock(lock);
873 ll_rw_block(WRITE, 1, &bh);
874 spin_lock(lock);
875 }
876 put_bh(bh);
877 cond_resched_lock(lock);
878 }
879 spin_unlock(lock);
880 return ret;
881}
882
883static int flush_older_commits(struct super_block *s,
884 struct reiserfs_journal_list *jl)
885{
886 struct reiserfs_journal *journal = SB_JOURNAL(s);
887 struct reiserfs_journal_list *other_jl;
888 struct reiserfs_journal_list *first_jl;
889 struct list_head *entry;
890 unsigned int trans_id = jl->j_trans_id;
891 unsigned int other_trans_id;
892 unsigned int first_trans_id;
893
894find_first:
895 /*
896 * first we walk backwards to find the oldest uncommitted transation
897 */
898 first_jl = jl;
899 entry = jl->j_list.prev;
900 while (1) {
901 other_jl = JOURNAL_LIST_ENTRY(entry);
902 if (entry == &journal->j_journal_list ||
903 atomic_read(&other_jl->j_older_commits_done))
904 break;
905
906 first_jl = other_jl;
907 entry = other_jl->j_list.prev;
908 }
909
910 /* if we didn't find any older uncommitted transactions, return now */
911 if (first_jl == jl) {
912 return 0;
913 }
914
915 first_trans_id = first_jl->j_trans_id;
916
917 entry = &first_jl->j_list;
918 while (1) {
919 other_jl = JOURNAL_LIST_ENTRY(entry);
920 other_trans_id = other_jl->j_trans_id;
921
922 if (other_trans_id < trans_id) {
923 if (atomic_read(&other_jl->j_commit_left) != 0) {
924 flush_commit_list(s, other_jl, 0);
925
926 /* list we were called with is gone, return */
927 if (!journal_list_still_alive(s, trans_id))
928 return 1;
929
930 /*
931 * the one we just flushed is gone, this means
932 * all older lists are also gone, so first_jl
933 * is no longer valid either. Go back to the
934 * beginning.
935 */
936 if (!journal_list_still_alive
937 (s, other_trans_id)) {
938 goto find_first;
939 }
940 }
941 entry = entry->next;
942 if (entry == &journal->j_journal_list)
943 return 0;
944 } else {
945 return 0;
946 }
947 }
948 return 0;
949}
950
951static int reiserfs_async_progress_wait(struct super_block *s)
952{
953 struct reiserfs_journal *j = SB_JOURNAL(s);
954
955 if (atomic_read(&j->j_async_throttle)) {
956 int depth;
957
958 depth = reiserfs_write_unlock_nested(s);
959 congestion_wait(BLK_RW_ASYNC, HZ / 10);
960 reiserfs_write_lock_nested(s, depth);
961 }
962
963 return 0;
964}
965
966/*
967 * if this journal list still has commit blocks unflushed, send them to disk.
968 *
969 * log areas must be flushed in order (transaction 2 can't commit before
970 * transaction 1) Before the commit block can by written, every other log
971 * block must be safely on disk
972 */
973static int flush_commit_list(struct super_block *s,
974 struct reiserfs_journal_list *jl, int flushall)
975{
976 int i;
977 b_blocknr_t bn;
978 struct buffer_head *tbh = NULL;
979 unsigned int trans_id = jl->j_trans_id;
980 struct reiserfs_journal *journal = SB_JOURNAL(s);
981 int retval = 0;
982 int write_len;
983 int depth;
984
985 reiserfs_check_lock_depth(s, "flush_commit_list");
986
987 if (atomic_read(&jl->j_older_commits_done)) {
988 return 0;
989 }
990
991 /*
992 * before we can put our commit blocks on disk, we have to make
993 * sure everyone older than us is on disk too
994 */
995 BUG_ON(jl->j_len <= 0);
996 BUG_ON(trans_id == journal->j_trans_id);
997
998 get_journal_list(jl);
999 if (flushall) {
1000 if (flush_older_commits(s, jl) == 1) {
1001 /*
1002 * list disappeared during flush_older_commits.
1003 * return
1004 */
1005 goto put_jl;
1006 }
1007 }
1008
1009 /* make sure nobody is trying to flush this one at the same time */
1010 reiserfs_mutex_lock_safe(&jl->j_commit_mutex, s);
1011
1012 if (!journal_list_still_alive(s, trans_id)) {
1013 mutex_unlock(&jl->j_commit_mutex);
1014 goto put_jl;
1015 }
1016 BUG_ON(jl->j_trans_id == 0);
1017
1018 /* this commit is done, exit */
1019 if (atomic_read(&jl->j_commit_left) <= 0) {
1020 if (flushall) {
1021 atomic_set(&jl->j_older_commits_done, 1);
1022 }
1023 mutex_unlock(&jl->j_commit_mutex);
1024 goto put_jl;
1025 }
1026
1027 if (!list_empty(&jl->j_bh_list)) {
1028 int ret;
1029
1030 /*
1031 * We might sleep in numerous places inside
1032 * write_ordered_buffers. Relax the write lock.
1033 */
1034 depth = reiserfs_write_unlock_nested(s);
1035 ret = write_ordered_buffers(&journal->j_dirty_buffers_lock,
1036 journal, jl, &jl->j_bh_list);
1037 if (ret < 0 && retval == 0)
1038 retval = ret;
1039 reiserfs_write_lock_nested(s, depth);
1040 }
1041 BUG_ON(!list_empty(&jl->j_bh_list));
1042 /*
1043 * for the description block and all the log blocks, submit any buffers
1044 * that haven't already reached the disk. Try to write at least 256
1045 * log blocks. later on, we will only wait on blocks that correspond
1046 * to this transaction, but while we're unplugging we might as well
1047 * get a chunk of data on there.
1048 */
1049 atomic_inc(&journal->j_async_throttle);
1050 write_len = jl->j_len + 1;
1051 if (write_len < 256)
1052 write_len = 256;
1053 for (i = 0 ; i < write_len ; i++) {
1054 bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) + (jl->j_start + i) %
1055 SB_ONDISK_JOURNAL_SIZE(s);
1056 tbh = journal_find_get_block(s, bn);
1057 if (tbh) {
1058 if (buffer_dirty(tbh)) {
1059 depth = reiserfs_write_unlock_nested(s);
1060 ll_rw_block(WRITE, 1, &tbh);
1061 reiserfs_write_lock_nested(s, depth);
1062 }
1063 put_bh(tbh) ;
1064 }
1065 }
1066 atomic_dec(&journal->j_async_throttle);
1067
1068 for (i = 0; i < (jl->j_len + 1); i++) {
1069 bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) +
1070 (jl->j_start + i) % SB_ONDISK_JOURNAL_SIZE(s);
1071 tbh = journal_find_get_block(s, bn);
1072
1073 depth = reiserfs_write_unlock_nested(s);
1074 __wait_on_buffer(tbh);
1075 reiserfs_write_lock_nested(s, depth);
1076 /*
1077 * since we're using ll_rw_blk above, it might have skipped
1078 * over a locked buffer. Double check here
1079 */
1080 /* redundant, sync_dirty_buffer() checks */
1081 if (buffer_dirty(tbh)) {
1082 depth = reiserfs_write_unlock_nested(s);
1083 sync_dirty_buffer(tbh);
1084 reiserfs_write_lock_nested(s, depth);
1085 }
1086 if (unlikely(!buffer_uptodate(tbh))) {
1087#ifdef CONFIG_REISERFS_CHECK
1088 reiserfs_warning(s, "journal-601",
1089 "buffer write failed");
1090#endif
1091 retval = -EIO;
1092 }
1093 /* once for journal_find_get_block */
1094 put_bh(tbh);
1095 /* once due to original getblk in do_journal_end */
1096 put_bh(tbh);
1097 atomic_dec(&jl->j_commit_left);
1098 }
1099
1100 BUG_ON(atomic_read(&jl->j_commit_left) != 1);
1101
1102 /*
1103 * If there was a write error in the journal - we can't commit
1104 * this transaction - it will be invalid and, if successful,
1105 * will just end up propagating the write error out to
1106 * the file system.
1107 */
1108 if (likely(!retval && !reiserfs_is_journal_aborted (journal))) {
1109 if (buffer_dirty(jl->j_commit_bh))
1110 BUG();
1111 mark_buffer_dirty(jl->j_commit_bh) ;
1112 depth = reiserfs_write_unlock_nested(s);
1113 if (reiserfs_barrier_flush(s))
1114 __sync_dirty_buffer(jl->j_commit_bh, WRITE_FLUSH_FUA);
1115 else
1116 sync_dirty_buffer(jl->j_commit_bh);
1117 reiserfs_write_lock_nested(s, depth);
1118 }
1119
1120 /*
1121 * If there was a write error in the journal - we can't commit this
1122 * transaction - it will be invalid and, if successful, will just end
1123 * up propagating the write error out to the filesystem.
1124 */
1125 if (unlikely(!buffer_uptodate(jl->j_commit_bh))) {
1126#ifdef CONFIG_REISERFS_CHECK
1127 reiserfs_warning(s, "journal-615", "buffer write failed");
1128#endif
1129 retval = -EIO;
1130 }
1131 bforget(jl->j_commit_bh);
1132 if (journal->j_last_commit_id != 0 &&
1133 (jl->j_trans_id - journal->j_last_commit_id) != 1) {
1134 reiserfs_warning(s, "clm-2200", "last commit %lu, current %lu",
1135 journal->j_last_commit_id, jl->j_trans_id);
1136 }
1137 journal->j_last_commit_id = jl->j_trans_id;
1138
1139 /*
1140 * now, every commit block is on the disk. It is safe to allow
1141 * blocks freed during this transaction to be reallocated
1142 */
1143 cleanup_freed_for_journal_list(s, jl);
1144
1145 retval = retval ? retval : journal->j_errno;
1146
1147 /* mark the metadata dirty */
1148 if (!retval)
1149 dirty_one_transaction(s, jl);
1150 atomic_dec(&jl->j_commit_left);
1151
1152 if (flushall) {
1153 atomic_set(&jl->j_older_commits_done, 1);
1154 }
1155 mutex_unlock(&jl->j_commit_mutex);
1156put_jl:
1157 put_journal_list(s, jl);
1158
1159 if (retval)
1160 reiserfs_abort(s, retval, "Journal write error in %s",
1161 __func__);
1162 return retval;
1163}
1164
1165/*
1166 * flush_journal_list frequently needs to find a newer transaction for a
1167 * given block. This does that, or returns NULL if it can't find anything
1168 */
1169static struct reiserfs_journal_list *find_newer_jl_for_cn(struct
1170 reiserfs_journal_cnode
1171 *cn)
1172{
1173 struct super_block *sb = cn->sb;
1174 b_blocknr_t blocknr = cn->blocknr;
1175
1176 cn = cn->hprev;
1177 while (cn) {
1178 if (cn->sb == sb && cn->blocknr == blocknr && cn->jlist) {
1179 return cn->jlist;
1180 }
1181 cn = cn->hprev;
1182 }
1183 return NULL;
1184}
1185
1186static void remove_journal_hash(struct super_block *,
1187 struct reiserfs_journal_cnode **,
1188 struct reiserfs_journal_list *, unsigned long,
1189 int);
1190
1191/*
1192 * once all the real blocks have been flushed, it is safe to remove them
1193 * from the journal list for this transaction. Aside from freeing the
1194 * cnode, this also allows the block to be reallocated for data blocks
1195 * if it had been deleted.
1196 */
1197static void remove_all_from_journal_list(struct super_block *sb,
1198 struct reiserfs_journal_list *jl,
1199 int debug)
1200{
1201 struct reiserfs_journal *journal = SB_JOURNAL(sb);
1202 struct reiserfs_journal_cnode *cn, *last;
1203 cn = jl->j_realblock;
1204
1205 /*
1206 * which is better, to lock once around the whole loop, or
1207 * to lock for each call to remove_journal_hash?
1208 */
1209 while (cn) {
1210 if (cn->blocknr != 0) {
1211 if (debug) {
1212 reiserfs_warning(sb, "reiserfs-2201",
1213 "block %u, bh is %d, state %ld",
1214 cn->blocknr, cn->bh ? 1 : 0,
1215 cn->state);
1216 }
1217 cn->state = 0;
1218 remove_journal_hash(sb, journal->j_list_hash_table,
1219 jl, cn->blocknr, 1);
1220 }
1221 last = cn;
1222 cn = cn->next;
1223 free_cnode(sb, last);
1224 }
1225 jl->j_realblock = NULL;
1226}
1227
1228/*
1229 * if this timestamp is greater than the timestamp we wrote last to the
1230 * header block, write it to the header block. once this is done, I can
1231 * safely say the log area for this transaction won't ever be replayed,
1232 * and I can start releasing blocks in this transaction for reuse as data
1233 * blocks. called by flush_journal_list, before it calls
1234 * remove_all_from_journal_list
1235 */
1236static int _update_journal_header_block(struct super_block *sb,
1237 unsigned long offset,
1238 unsigned int trans_id)
1239{
1240 struct reiserfs_journal_header *jh;
1241 struct reiserfs_journal *journal = SB_JOURNAL(sb);
1242 int depth;
1243
1244 if (reiserfs_is_journal_aborted(journal))
1245 return -EIO;
1246
1247 if (trans_id >= journal->j_last_flush_trans_id) {
1248 if (buffer_locked((journal->j_header_bh))) {
1249 depth = reiserfs_write_unlock_nested(sb);
1250 __wait_on_buffer(journal->j_header_bh);
1251 reiserfs_write_lock_nested(sb, depth);
1252 if (unlikely(!buffer_uptodate(journal->j_header_bh))) {
1253#ifdef CONFIG_REISERFS_CHECK
1254 reiserfs_warning(sb, "journal-699",
1255 "buffer write failed");
1256#endif
1257 return -EIO;
1258 }
1259 }
1260 journal->j_last_flush_trans_id = trans_id;
1261 journal->j_first_unflushed_offset = offset;
1262 jh = (struct reiserfs_journal_header *)(journal->j_header_bh->
1263 b_data);
1264 jh->j_last_flush_trans_id = cpu_to_le32(trans_id);
1265 jh->j_first_unflushed_offset = cpu_to_le32(offset);
1266 jh->j_mount_id = cpu_to_le32(journal->j_mount_id);
1267
1268 set_buffer_dirty(journal->j_header_bh);
1269 depth = reiserfs_write_unlock_nested(sb);
1270
1271 if (reiserfs_barrier_flush(sb))
1272 __sync_dirty_buffer(journal->j_header_bh, WRITE_FLUSH_FUA);
1273 else
1274 sync_dirty_buffer(journal->j_header_bh);
1275
1276 reiserfs_write_lock_nested(sb, depth);
1277 if (!buffer_uptodate(journal->j_header_bh)) {
1278 reiserfs_warning(sb, "journal-837",
1279 "IO error during journal replay");
1280 return -EIO;
1281 }
1282 }
1283 return 0;
1284}
1285
1286static int update_journal_header_block(struct super_block *sb,
1287 unsigned long offset,
1288 unsigned int trans_id)
1289{
1290 return _update_journal_header_block(sb, offset, trans_id);
1291}
1292
1293/*
1294** flush any and all journal lists older than you are
1295** can only be called from flush_journal_list
1296*/
1297static int flush_older_journal_lists(struct super_block *sb,
1298 struct reiserfs_journal_list *jl)
1299{
1300 struct list_head *entry;
1301 struct reiserfs_journal_list *other_jl;
1302 struct reiserfs_journal *journal = SB_JOURNAL(sb);
1303 unsigned int trans_id = jl->j_trans_id;
1304
1305 /*
1306 * we know we are the only ones flushing things, no extra race
1307 * protection is required.
1308 */
1309restart:
1310 entry = journal->j_journal_list.next;
1311 /* Did we wrap? */
1312 if (entry == &journal->j_journal_list)
1313 return 0;
1314 other_jl = JOURNAL_LIST_ENTRY(entry);
1315 if (other_jl->j_trans_id < trans_id) {
1316 BUG_ON(other_jl->j_refcount <= 0);
1317 /* do not flush all */
1318 flush_journal_list(sb, other_jl, 0);
1319
1320 /* other_jl is now deleted from the list */
1321 goto restart;
1322 }
1323 return 0;
1324}
1325
1326static void del_from_work_list(struct super_block *s,
1327 struct reiserfs_journal_list *jl)
1328{
1329 struct reiserfs_journal *journal = SB_JOURNAL(s);
1330 if (!list_empty(&jl->j_working_list)) {
1331 list_del_init(&jl->j_working_list);
1332 journal->j_num_work_lists--;
1333 }
1334}
1335
1336/*
1337 * flush a journal list, both commit and real blocks
1338 *
1339 * always set flushall to 1, unless you are calling from inside
1340 * flush_journal_list
1341 *
1342 * IMPORTANT. This can only be called while there are no journal writers,
1343 * and the journal is locked. That means it can only be called from
1344 * do_journal_end, or by journal_release
1345 */
1346static int flush_journal_list(struct super_block *s,
1347 struct reiserfs_journal_list *jl, int flushall)
1348{
1349 struct reiserfs_journal_list *pjl;
1350 struct reiserfs_journal_cnode *cn, *last;
1351 int count;
1352 int was_jwait = 0;
1353 int was_dirty = 0;
1354 struct buffer_head *saved_bh;
1355 unsigned long j_len_saved = jl->j_len;
1356 struct reiserfs_journal *journal = SB_JOURNAL(s);
1357 int err = 0;
1358 int depth;
1359
1360 BUG_ON(j_len_saved <= 0);
1361
1362 if (atomic_read(&journal->j_wcount) != 0) {
1363 reiserfs_warning(s, "clm-2048", "called with wcount %d",
1364 atomic_read(&journal->j_wcount));
1365 }
1366
1367 /* if flushall == 0, the lock is already held */
1368 if (flushall) {
1369 reiserfs_mutex_lock_safe(&journal->j_flush_mutex, s);
1370 } else if (mutex_trylock(&journal->j_flush_mutex)) {
1371 BUG();
1372 }
1373
1374 count = 0;
1375 if (j_len_saved > journal->j_trans_max) {
1376 reiserfs_panic(s, "journal-715", "length is %lu, trans id %lu",
1377 j_len_saved, jl->j_trans_id);
1378 return 0;
1379 }
1380
1381 /* if all the work is already done, get out of here */
1382 if (atomic_read(&jl->j_nonzerolen) <= 0 &&
1383 atomic_read(&jl->j_commit_left) <= 0) {
1384 goto flush_older_and_return;
1385 }
1386
1387 /*
1388 * start by putting the commit list on disk. This will also flush
1389 * the commit lists of any olders transactions
1390 */
1391 flush_commit_list(s, jl, 1);
1392
1393 if (!(jl->j_state & LIST_DIRTY)
1394 && !reiserfs_is_journal_aborted(journal))
1395 BUG();
1396
1397 /* are we done now? */
1398 if (atomic_read(&jl->j_nonzerolen) <= 0 &&
1399 atomic_read(&jl->j_commit_left) <= 0) {
1400 goto flush_older_and_return;
1401 }
1402
1403 /*
1404 * loop through each cnode, see if we need to write it,
1405 * or wait on a more recent transaction, or just ignore it
1406 */
1407 if (atomic_read(&journal->j_wcount) != 0) {
1408 reiserfs_panic(s, "journal-844", "journal list is flushing, "
1409 "wcount is not 0");
1410 }
1411 cn = jl->j_realblock;
1412 while (cn) {
1413 was_jwait = 0;
1414 was_dirty = 0;
1415 saved_bh = NULL;
1416 /* blocknr of 0 is no longer in the hash, ignore it */
1417 if (cn->blocknr == 0) {
1418 goto free_cnode;
1419 }
1420
1421 /*
1422 * This transaction failed commit.
1423 * Don't write out to the disk
1424 */
1425 if (!(jl->j_state & LIST_DIRTY))
1426 goto free_cnode;
1427
1428 pjl = find_newer_jl_for_cn(cn);
1429 /*
1430 * the order is important here. We check pjl to make sure we
1431 * don't clear BH_JDirty_wait if we aren't the one writing this
1432 * block to disk
1433 */
1434 if (!pjl && cn->bh) {
1435 saved_bh = cn->bh;
1436
1437 /*
1438 * we do this to make sure nobody releases the
1439 * buffer while we are working with it
1440 */
1441 get_bh(saved_bh);
1442
1443 if (buffer_journal_dirty(saved_bh)) {
1444 BUG_ON(!can_dirty(cn));
1445 was_jwait = 1;
1446 was_dirty = 1;
1447 } else if (can_dirty(cn)) {
1448 /*
1449 * everything with !pjl && jwait
1450 * should be writable
1451 */
1452 BUG();
1453 }
1454 }
1455
1456 /*
1457 * if someone has this block in a newer transaction, just make
1458 * sure they are committed, and don't try writing it to disk
1459 */
1460 if (pjl) {
1461 if (atomic_read(&pjl->j_commit_left))
1462 flush_commit_list(s, pjl, 1);
1463 goto free_cnode;
1464 }
1465
1466 /*
1467 * bh == NULL when the block got to disk on its own, OR,
1468 * the block got freed in a future transaction
1469 */
1470 if (saved_bh == NULL) {
1471 goto free_cnode;
1472 }
1473
1474 /*
1475 * this should never happen. kupdate_one_transaction has
1476 * this list locked while it works, so we should never see a
1477 * buffer here that is not marked JDirty_wait
1478 */
1479 if ((!was_jwait) && !buffer_locked(saved_bh)) {
1480 reiserfs_warning(s, "journal-813",
1481 "BAD! buffer %llu %cdirty %cjwait, "
1482 "not in a newer tranasction",
1483 (unsigned long long)saved_bh->
1484 b_blocknr, was_dirty ? ' ' : '!',
1485 was_jwait ? ' ' : '!');
1486 }
1487 if (was_dirty) {
1488 /*
1489 * we inc again because saved_bh gets decremented
1490 * at free_cnode
1491 */
1492 get_bh(saved_bh);
1493 set_bit(BLOCK_NEEDS_FLUSH, &cn->state);
1494 lock_buffer(saved_bh);
1495 BUG_ON(cn->blocknr != saved_bh->b_blocknr);
1496 if (buffer_dirty(saved_bh))
1497 submit_logged_buffer(saved_bh);
1498 else
1499 unlock_buffer(saved_bh);
1500 count++;
1501 } else {
1502 reiserfs_warning(s, "clm-2082",
1503 "Unable to flush buffer %llu in %s",
1504 (unsigned long long)saved_bh->
1505 b_blocknr, __func__);
1506 }
1507free_cnode:
1508 last = cn;
1509 cn = cn->next;
1510 if (saved_bh) {
1511 /*
1512 * we incremented this to keep others from
1513 * taking the buffer head away
1514 */
1515 put_bh(saved_bh);
1516 if (atomic_read(&saved_bh->b_count) < 0) {
1517 reiserfs_warning(s, "journal-945",
1518 "saved_bh->b_count < 0");
1519 }
1520 }
1521 }
1522 if (count > 0) {
1523 cn = jl->j_realblock;
1524 while (cn) {
1525 if (test_bit(BLOCK_NEEDS_FLUSH, &cn->state)) {
1526 if (!cn->bh) {
1527 reiserfs_panic(s, "journal-1011",
1528 "cn->bh is NULL");
1529 }
1530
1531 depth = reiserfs_write_unlock_nested(s);
1532 __wait_on_buffer(cn->bh);
1533 reiserfs_write_lock_nested(s, depth);
1534
1535 if (!cn->bh) {
1536 reiserfs_panic(s, "journal-1012",
1537 "cn->bh is NULL");
1538 }
1539 if (unlikely(!buffer_uptodate(cn->bh))) {
1540#ifdef CONFIG_REISERFS_CHECK
1541 reiserfs_warning(s, "journal-949",
1542 "buffer write failed");
1543#endif
1544 err = -EIO;
1545 }
1546 /*
1547 * note, we must clear the JDirty_wait bit
1548 * after the up to date check, otherwise we
1549 * race against our flushpage routine
1550 */
1551 BUG_ON(!test_clear_buffer_journal_dirty
1552 (cn->bh));
1553
1554 /* drop one ref for us */
1555 put_bh(cn->bh);
1556 /* drop one ref for journal_mark_dirty */
1557 release_buffer_page(cn->bh);
1558 }
1559 cn = cn->next;
1560 }
1561 }
1562
1563 if (err)
1564 reiserfs_abort(s, -EIO,
1565 "Write error while pushing transaction to disk in %s",
1566 __func__);
1567flush_older_and_return:
1568
1569 /*
1570 * before we can update the journal header block, we _must_ flush all
1571 * real blocks from all older transactions to disk. This is because
1572 * once the header block is updated, this transaction will not be
1573 * replayed after a crash
1574 */
1575 if (flushall) {
1576 flush_older_journal_lists(s, jl);
1577 }
1578
1579 err = journal->j_errno;
1580 /*
1581 * before we can remove everything from the hash tables for this
1582 * transaction, we must make sure it can never be replayed
1583 *
1584 * since we are only called from do_journal_end, we know for sure there
1585 * are no allocations going on while we are flushing journal lists. So,
1586 * we only need to update the journal header block for the last list
1587 * being flushed
1588 */
1589 if (!err && flushall) {
1590 err =
1591 update_journal_header_block(s,
1592 (jl->j_start + jl->j_len +
1593 2) % SB_ONDISK_JOURNAL_SIZE(s),
1594 jl->j_trans_id);
1595 if (err)
1596 reiserfs_abort(s, -EIO,
1597 "Write error while updating journal header in %s",
1598 __func__);
1599 }
1600 remove_all_from_journal_list(s, jl, 0);
1601 list_del_init(&jl->j_list);
1602 journal->j_num_lists--;
1603 del_from_work_list(s, jl);
1604
1605 if (journal->j_last_flush_id != 0 &&
1606 (jl->j_trans_id - journal->j_last_flush_id) != 1) {
1607 reiserfs_warning(s, "clm-2201", "last flush %lu, current %lu",
1608 journal->j_last_flush_id, jl->j_trans_id);
1609 }
1610 journal->j_last_flush_id = jl->j_trans_id;
1611
1612 /*
1613 * not strictly required since we are freeing the list, but it should
1614 * help find code using dead lists later on
1615 */
1616 jl->j_len = 0;
1617 atomic_set(&jl->j_nonzerolen, 0);
1618 jl->j_start = 0;
1619 jl->j_realblock = NULL;
1620 jl->j_commit_bh = NULL;
1621 jl->j_trans_id = 0;
1622 jl->j_state = 0;
1623 put_journal_list(s, jl);
1624 if (flushall)
1625 mutex_unlock(&journal->j_flush_mutex);
1626 return err;
1627}
1628
1629static int write_one_transaction(struct super_block *s,
1630 struct reiserfs_journal_list *jl,
1631 struct buffer_chunk *chunk)
1632{
1633 struct reiserfs_journal_cnode *cn;
1634 int ret = 0;
1635
1636 jl->j_state |= LIST_TOUCHED;
1637 del_from_work_list(s, jl);
1638 if (jl->j_len == 0 || atomic_read(&jl->j_nonzerolen) == 0) {
1639 return 0;
1640 }
1641
1642 cn = jl->j_realblock;
1643 while (cn) {
1644 /*
1645 * if the blocknr == 0, this has been cleared from the hash,
1646 * skip it
1647 */
1648 if (cn->blocknr == 0) {
1649 goto next;
1650 }
1651 if (cn->bh && can_dirty(cn) && buffer_dirty(cn->bh)) {
1652 struct buffer_head *tmp_bh;
1653 /*
1654 * we can race against journal_mark_freed when we try
1655 * to lock_buffer(cn->bh), so we have to inc the buffer
1656 * count, and recheck things after locking
1657 */
1658 tmp_bh = cn->bh;
1659 get_bh(tmp_bh);
1660 lock_buffer(tmp_bh);
1661 if (cn->bh && can_dirty(cn) && buffer_dirty(tmp_bh)) {
1662 if (!buffer_journal_dirty(tmp_bh) ||
1663 buffer_journal_prepared(tmp_bh))
1664 BUG();
1665 add_to_chunk(chunk, tmp_bh, NULL, write_chunk);
1666 ret++;
1667 } else {
1668 /* note, cn->bh might be null now */
1669 unlock_buffer(tmp_bh);
1670 }
1671 put_bh(tmp_bh);
1672 }
1673next:
1674 cn = cn->next;
1675 cond_resched();
1676 }
1677 return ret;
1678}
1679
1680/* used by flush_commit_list */
1681static int dirty_one_transaction(struct super_block *s,
1682 struct reiserfs_journal_list *jl)
1683{
1684 struct reiserfs_journal_cnode *cn;
1685 struct reiserfs_journal_list *pjl;
1686 int ret = 0;
1687
1688 jl->j_state |= LIST_DIRTY;
1689 cn = jl->j_realblock;
1690 while (cn) {
1691 /*
1692 * look for a more recent transaction that logged this
1693 * buffer. Only the most recent transaction with a buffer in
1694 * it is allowed to send that buffer to disk
1695 */
1696 pjl = find_newer_jl_for_cn(cn);
1697 if (!pjl && cn->blocknr && cn->bh
1698 && buffer_journal_dirty(cn->bh)) {
1699 BUG_ON(!can_dirty(cn));
1700 /*
1701 * if the buffer is prepared, it will either be logged
1702 * or restored. If restored, we need to make sure
1703 * it actually gets marked dirty
1704 */
1705 clear_buffer_journal_new(cn->bh);
1706 if (buffer_journal_prepared(cn->bh)) {
1707 set_buffer_journal_restore_dirty(cn->bh);
1708 } else {
1709 set_buffer_journal_test(cn->bh);
1710 mark_buffer_dirty(cn->bh);
1711 }
1712 }
1713 cn = cn->next;
1714 }
1715 return ret;
1716}
1717
1718static int kupdate_transactions(struct super_block *s,
1719 struct reiserfs_journal_list *jl,
1720 struct reiserfs_journal_list **next_jl,
1721 unsigned int *next_trans_id,
1722 int num_blocks, int num_trans)
1723{
1724 int ret = 0;
1725 int written = 0;
1726 int transactions_flushed = 0;
1727 unsigned int orig_trans_id = jl->j_trans_id;
1728 struct buffer_chunk chunk;
1729 struct list_head *entry;
1730 struct reiserfs_journal *journal = SB_JOURNAL(s);
1731 chunk.nr = 0;
1732
1733 reiserfs_mutex_lock_safe(&journal->j_flush_mutex, s);
1734 if (!journal_list_still_alive(s, orig_trans_id)) {
1735 goto done;
1736 }
1737
1738 /*
1739 * we've got j_flush_mutex held, nobody is going to delete any
1740 * of these lists out from underneath us
1741 */
1742 while ((num_trans && transactions_flushed < num_trans) ||
1743 (!num_trans && written < num_blocks)) {
1744
1745 if (jl->j_len == 0 || (jl->j_state & LIST_TOUCHED) ||
1746 atomic_read(&jl->j_commit_left)
1747 || !(jl->j_state & LIST_DIRTY)) {
1748 del_from_work_list(s, jl);
1749 break;
1750 }
1751 ret = write_one_transaction(s, jl, &chunk);
1752
1753 if (ret < 0)
1754 goto done;
1755 transactions_flushed++;
1756 written += ret;
1757 entry = jl->j_list.next;
1758
1759 /* did we wrap? */
1760 if (entry == &journal->j_journal_list) {
1761 break;
1762 }
1763 jl = JOURNAL_LIST_ENTRY(entry);
1764
1765 /* don't bother with older transactions */
1766 if (jl->j_trans_id <= orig_trans_id)
1767 break;
1768 }
1769 if (chunk.nr) {
1770 write_chunk(&chunk);
1771 }
1772
1773done:
1774 mutex_unlock(&journal->j_flush_mutex);
1775 return ret;
1776}
1777
1778/*
1779 * for o_sync and fsync heavy applications, they tend to use
1780 * all the journa list slots with tiny transactions. These
1781 * trigger lots and lots of calls to update the header block, which
1782 * adds seeks and slows things down.
1783 *
1784 * This function tries to clear out a large chunk of the journal lists
1785 * at once, which makes everything faster since only the newest journal
1786 * list updates the header block
1787 */
1788static int flush_used_journal_lists(struct super_block *s,
1789 struct reiserfs_journal_list *jl)
1790{
1791 unsigned long len = 0;
1792 unsigned long cur_len;
1793 int ret;
1794 int i;
1795 int limit = 256;
1796 struct reiserfs_journal_list *tjl;
1797 struct reiserfs_journal_list *flush_jl;
1798 unsigned int trans_id;
1799 struct reiserfs_journal *journal = SB_JOURNAL(s);
1800
1801 flush_jl = tjl = jl;
1802
1803 /* in data logging mode, try harder to flush a lot of blocks */
1804 if (reiserfs_data_log(s))
1805 limit = 1024;
1806 /* flush for 256 transactions or limit blocks, whichever comes first */
1807 for (i = 0; i < 256 && len < limit; i++) {
1808 if (atomic_read(&tjl->j_commit_left) ||
1809 tjl->j_trans_id < jl->j_trans_id) {
1810 break;
1811 }
1812 cur_len = atomic_read(&tjl->j_nonzerolen);
1813 if (cur_len > 0) {
1814 tjl->j_state &= ~LIST_TOUCHED;
1815 }
1816 len += cur_len;
1817 flush_jl = tjl;
1818 if (tjl->j_list.next == &journal->j_journal_list)
1819 break;
1820 tjl = JOURNAL_LIST_ENTRY(tjl->j_list.next);
1821 }
1822 get_journal_list(jl);
1823 get_journal_list(flush_jl);
1824
1825 /*
1826 * try to find a group of blocks we can flush across all the
1827 * transactions, but only bother if we've actually spanned
1828 * across multiple lists
1829 */
1830 if (flush_jl != jl) {
1831 ret = kupdate_transactions(s, jl, &tjl, &trans_id, len, i);
1832 }
1833 flush_journal_list(s, flush_jl, 1);
1834 put_journal_list(s, flush_jl);
1835 put_journal_list(s, jl);
1836 return 0;
1837}
1838
1839/*
1840 * removes any nodes in table with name block and dev as bh.
1841 * only touchs the hnext and hprev pointers.
1842 */
1843void remove_journal_hash(struct super_block *sb,
1844 struct reiserfs_journal_cnode **table,
1845 struct reiserfs_journal_list *jl,
1846 unsigned long block, int remove_freed)
1847{
1848 struct reiserfs_journal_cnode *cur;
1849 struct reiserfs_journal_cnode **head;
1850
1851 head = &(journal_hash(table, sb, block));
1852 if (!head) {
1853 return;
1854 }
1855 cur = *head;
1856 while (cur) {
1857 if (cur->blocknr == block && cur->sb == sb
1858 && (jl == NULL || jl == cur->jlist)
1859 && (!test_bit(BLOCK_FREED, &cur->state) || remove_freed)) {
1860 if (cur->hnext) {
1861 cur->hnext->hprev = cur->hprev;
1862 }
1863 if (cur->hprev) {
1864 cur->hprev->hnext = cur->hnext;
1865 } else {
1866 *head = cur->hnext;
1867 }
1868 cur->blocknr = 0;
1869 cur->sb = NULL;
1870 cur->state = 0;
1871 /*
1872 * anybody who clears the cur->bh will also
1873 * dec the nonzerolen
1874 */
1875 if (cur->bh && cur->jlist)
1876 atomic_dec(&cur->jlist->j_nonzerolen);
1877 cur->bh = NULL;
1878 cur->jlist = NULL;
1879 }
1880 cur = cur->hnext;
1881 }
1882}
1883
1884static void free_journal_ram(struct super_block *sb)
1885{
1886 struct reiserfs_journal *journal = SB_JOURNAL(sb);
1887 kfree(journal->j_current_jl);
1888 journal->j_num_lists--;
1889
1890 vfree(journal->j_cnode_free_orig);
1891 free_list_bitmaps(sb, journal->j_list_bitmap);
1892 free_bitmap_nodes(sb); /* must be after free_list_bitmaps */
1893 if (journal->j_header_bh) {
1894 brelse(journal->j_header_bh);
1895 }
1896 /*
1897 * j_header_bh is on the journal dev, make sure
1898 * not to release the journal dev until we brelse j_header_bh
1899 */
1900 release_journal_dev(sb, journal);
1901 vfree(journal);
1902}
1903
1904/*
1905 * call on unmount. Only set error to 1 if you haven't made your way out
1906 * of read_super() yet. Any other caller must keep error at 0.
1907 */
1908static int do_journal_release(struct reiserfs_transaction_handle *th,
1909 struct super_block *sb, int error)
1910{
1911 struct reiserfs_transaction_handle myth;
1912 int flushed = 0;
1913 struct reiserfs_journal *journal = SB_JOURNAL(sb);
1914
1915 /*
1916 * we only want to flush out transactions if we were
1917 * called with error == 0
1918 */
1919 if (!error && !(sb->s_flags & MS_RDONLY)) {
1920 /* end the current trans */
1921 BUG_ON(!th->t_trans_id);
1922 do_journal_end(th, FLUSH_ALL);
1923
1924 /*
1925 * make sure something gets logged to force
1926 * our way into the flush code
1927 */
1928 if (!journal_join(&myth, sb)) {
1929 reiserfs_prepare_for_journal(sb,
1930 SB_BUFFER_WITH_SB(sb),
1931 1);
1932 journal_mark_dirty(&myth, SB_BUFFER_WITH_SB(sb));
1933 do_journal_end(&myth, FLUSH_ALL);
1934 flushed = 1;
1935 }
1936 }
1937
1938 /* this also catches errors during the do_journal_end above */
1939 if (!error && reiserfs_is_journal_aborted(journal)) {
1940 memset(&myth, 0, sizeof(myth));
1941 if (!journal_join_abort(&myth, sb)) {
1942 reiserfs_prepare_for_journal(sb,
1943 SB_BUFFER_WITH_SB(sb),
1944 1);
1945 journal_mark_dirty(&myth, SB_BUFFER_WITH_SB(sb));
1946 do_journal_end(&myth, FLUSH_ALL);
1947 }
1948 }
1949
1950
1951 /*
1952 * We must release the write lock here because
1953 * the workqueue job (flush_async_commit) needs this lock
1954 */
1955 reiserfs_write_unlock(sb);
1956
1957 /*
1958 * Cancel flushing of old commits. Note that neither of these works
1959 * will be requeued because superblock is being shutdown and doesn't
1960 * have MS_ACTIVE set.
1961 */
1962 cancel_delayed_work_sync(&REISERFS_SB(sb)->old_work);
1963 /* wait for all commits to finish */
1964 cancel_delayed_work_sync(&SB_JOURNAL(sb)->j_work);
1965
1966 free_journal_ram(sb);
1967
1968 reiserfs_write_lock(sb);
1969
1970 return 0;
1971}
1972
1973/* * call on unmount. flush all journal trans, release all alloc'd ram */
1974int journal_release(struct reiserfs_transaction_handle *th,
1975 struct super_block *sb)
1976{
1977 return do_journal_release(th, sb, 0);
1978}
1979
1980/* only call from an error condition inside reiserfs_read_super! */
1981int journal_release_error(struct reiserfs_transaction_handle *th,
1982 struct super_block *sb)
1983{
1984 return do_journal_release(th, sb, 1);
1985}
1986
1987/*
1988 * compares description block with commit block.
1989 * returns 1 if they differ, 0 if they are the same
1990 */
1991static int journal_compare_desc_commit(struct super_block *sb,
1992 struct reiserfs_journal_desc *desc,
1993 struct reiserfs_journal_commit *commit)
1994{
1995 if (get_commit_trans_id(commit) != get_desc_trans_id(desc) ||
1996 get_commit_trans_len(commit) != get_desc_trans_len(desc) ||
1997 get_commit_trans_len(commit) > SB_JOURNAL(sb)->j_trans_max ||
1998 get_commit_trans_len(commit) <= 0) {
1999 return 1;
2000 }
2001 return 0;
2002}
2003
2004/*
2005 * returns 0 if it did not find a description block
2006 * returns -1 if it found a corrupt commit block
2007 * returns 1 if both desc and commit were valid
2008 * NOTE: only called during fs mount
2009 */
2010static int journal_transaction_is_valid(struct super_block *sb,
2011 struct buffer_head *d_bh,
2012 unsigned int *oldest_invalid_trans_id,
2013 unsigned long *newest_mount_id)
2014{
2015 struct reiserfs_journal_desc *desc;
2016 struct reiserfs_journal_commit *commit;
2017 struct buffer_head *c_bh;
2018 unsigned long offset;
2019
2020 if (!d_bh)
2021 return 0;
2022
2023 desc = (struct reiserfs_journal_desc *)d_bh->b_data;
2024 if (get_desc_trans_len(desc) > 0
2025 && !memcmp(get_journal_desc_magic(d_bh), JOURNAL_DESC_MAGIC, 8)) {
2026 if (oldest_invalid_trans_id && *oldest_invalid_trans_id
2027 && get_desc_trans_id(desc) > *oldest_invalid_trans_id) {
2028 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2029 "journal-986: transaction "
2030 "is valid returning because trans_id %d is greater than "
2031 "oldest_invalid %lu",
2032 get_desc_trans_id(desc),
2033 *oldest_invalid_trans_id);
2034 return 0;
2035 }
2036 if (newest_mount_id
2037 && *newest_mount_id > get_desc_mount_id(desc)) {
2038 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2039 "journal-1087: transaction "
2040 "is valid returning because mount_id %d is less than "
2041 "newest_mount_id %lu",
2042 get_desc_mount_id(desc),
2043 *newest_mount_id);
2044 return -1;
2045 }
2046 if (get_desc_trans_len(desc) > SB_JOURNAL(sb)->j_trans_max) {
2047 reiserfs_warning(sb, "journal-2018",
2048 "Bad transaction length %d "
2049 "encountered, ignoring transaction",
2050 get_desc_trans_len(desc));
2051 return -1;
2052 }
2053 offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2054
2055 /*
2056 * ok, we have a journal description block,
2057 * let's see if the transaction was valid
2058 */
2059 c_bh =
2060 journal_bread(sb,
2061 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2062 ((offset + get_desc_trans_len(desc) +
2063 1) % SB_ONDISK_JOURNAL_SIZE(sb)));
2064 if (!c_bh)
2065 return 0;
2066 commit = (struct reiserfs_journal_commit *)c_bh->b_data;
2067 if (journal_compare_desc_commit(sb, desc, commit)) {
2068 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2069 "journal_transaction_is_valid, commit offset %ld had bad "
2070 "time %d or length %d",
2071 c_bh->b_blocknr -
2072 SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2073 get_commit_trans_id(commit),
2074 get_commit_trans_len(commit));
2075 brelse(c_bh);
2076 if (oldest_invalid_trans_id) {
2077 *oldest_invalid_trans_id =
2078 get_desc_trans_id(desc);
2079 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2080 "journal-1004: "
2081 "transaction_is_valid setting oldest invalid trans_id "
2082 "to %d",
2083 get_desc_trans_id(desc));
2084 }
2085 return -1;
2086 }
2087 brelse(c_bh);
2088 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2089 "journal-1006: found valid "
2090 "transaction start offset %llu, len %d id %d",
2091 d_bh->b_blocknr -
2092 SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2093 get_desc_trans_len(desc),
2094 get_desc_trans_id(desc));
2095 return 1;
2096 } else {
2097 return 0;
2098 }
2099}
2100
2101static void brelse_array(struct buffer_head **heads, int num)
2102{
2103 int i;
2104 for (i = 0; i < num; i++) {
2105 brelse(heads[i]);
2106 }
2107}
2108
2109/*
2110 * given the start, and values for the oldest acceptable transactions,
2111 * this either reads in a replays a transaction, or returns because the
2112 * transaction is invalid, or too old.
2113 * NOTE: only called during fs mount
2114 */
2115static int journal_read_transaction(struct super_block *sb,
2116 unsigned long cur_dblock,
2117 unsigned long oldest_start,
2118 unsigned int oldest_trans_id,
2119 unsigned long newest_mount_id)
2120{
2121 struct reiserfs_journal *journal = SB_JOURNAL(sb);
2122 struct reiserfs_journal_desc *desc;
2123 struct reiserfs_journal_commit *commit;
2124 unsigned int trans_id = 0;
2125 struct buffer_head *c_bh;
2126 struct buffer_head *d_bh;
2127 struct buffer_head **log_blocks = NULL;
2128 struct buffer_head **real_blocks = NULL;
2129 unsigned int trans_offset;
2130 int i;
2131 int trans_half;
2132
2133 d_bh = journal_bread(sb, cur_dblock);
2134 if (!d_bh)
2135 return 1;
2136 desc = (struct reiserfs_journal_desc *)d_bh->b_data;
2137 trans_offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2138 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1037: "
2139 "journal_read_transaction, offset %llu, len %d mount_id %d",
2140 d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2141 get_desc_trans_len(desc), get_desc_mount_id(desc));
2142 if (get_desc_trans_id(desc) < oldest_trans_id) {
2143 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1039: "
2144 "journal_read_trans skipping because %lu is too old",
2145 cur_dblock -
2146 SB_ONDISK_JOURNAL_1st_BLOCK(sb));
2147 brelse(d_bh);
2148 return 1;
2149 }
2150 if (get_desc_mount_id(desc) != newest_mount_id) {
2151 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1146: "
2152 "journal_read_trans skipping because %d is != "
2153 "newest_mount_id %lu", get_desc_mount_id(desc),
2154 newest_mount_id);
2155 brelse(d_bh);
2156 return 1;
2157 }
2158 c_bh = journal_bread(sb, SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2159 ((trans_offset + get_desc_trans_len(desc) + 1) %
2160 SB_ONDISK_JOURNAL_SIZE(sb)));
2161 if (!c_bh) {
2162 brelse(d_bh);
2163 return 1;
2164 }
2165 commit = (struct reiserfs_journal_commit *)c_bh->b_data;
2166 if (journal_compare_desc_commit(sb, desc, commit)) {
2167 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2168 "journal_read_transaction, "
2169 "commit offset %llu had bad time %d or length %d",
2170 c_bh->b_blocknr -
2171 SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2172 get_commit_trans_id(commit),
2173 get_commit_trans_len(commit));
2174 brelse(c_bh);
2175 brelse(d_bh);
2176 return 1;
2177 }
2178
2179 if (bdev_read_only(sb->s_bdev)) {
2180 reiserfs_warning(sb, "clm-2076",
2181 "device is readonly, unable to replay log");
2182 brelse(c_bh);
2183 brelse(d_bh);
2184 return -EROFS;
2185 }
2186
2187 trans_id = get_desc_trans_id(desc);
2188 /*
2189 * now we know we've got a good transaction, and it was
2190 * inside the valid time ranges
2191 */
2192 log_blocks = kmalloc(get_desc_trans_len(desc) *
2193 sizeof(struct buffer_head *), GFP_NOFS);
2194 real_blocks = kmalloc(get_desc_trans_len(desc) *
2195 sizeof(struct buffer_head *), GFP_NOFS);
2196 if (!log_blocks || !real_blocks) {
2197 brelse(c_bh);
2198 brelse(d_bh);
2199 kfree(log_blocks);
2200 kfree(real_blocks);
2201 reiserfs_warning(sb, "journal-1169",
2202 "kmalloc failed, unable to mount FS");
2203 return -1;
2204 }
2205 /* get all the buffer heads */
2206 trans_half = journal_trans_half(sb->s_blocksize);
2207 for (i = 0; i < get_desc_trans_len(desc); i++) {
2208 log_blocks[i] =
2209 journal_getblk(sb,
2210 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2211 (trans_offset + 1 +
2212 i) % SB_ONDISK_JOURNAL_SIZE(sb));
2213 if (i < trans_half) {
2214 real_blocks[i] =
2215 sb_getblk(sb,
2216 le32_to_cpu(desc->j_realblock[i]));
2217 } else {
2218 real_blocks[i] =
2219 sb_getblk(sb,
2220 le32_to_cpu(commit->
2221 j_realblock[i - trans_half]));
2222 }
2223 if (real_blocks[i]->b_blocknr > SB_BLOCK_COUNT(sb)) {
2224 reiserfs_warning(sb, "journal-1207",
2225 "REPLAY FAILURE fsck required! "
2226 "Block to replay is outside of "
2227 "filesystem");
2228 goto abort_replay;
2229 }
2230 /* make sure we don't try to replay onto log or reserved area */
2231 if (is_block_in_log_or_reserved_area
2232 (sb, real_blocks[i]->b_blocknr)) {
2233 reiserfs_warning(sb, "journal-1204",
2234 "REPLAY FAILURE fsck required! "
2235 "Trying to replay onto a log block");
2236abort_replay:
2237 brelse_array(log_blocks, i);
2238 brelse_array(real_blocks, i);
2239 brelse(c_bh);
2240 brelse(d_bh);
2241 kfree(log_blocks);
2242 kfree(real_blocks);
2243 return -1;
2244 }
2245 }
2246 /* read in the log blocks, memcpy to the corresponding real block */
2247 ll_rw_block(READ, get_desc_trans_len(desc), log_blocks);
2248 for (i = 0; i < get_desc_trans_len(desc); i++) {
2249
2250 wait_on_buffer(log_blocks[i]);
2251 if (!buffer_uptodate(log_blocks[i])) {
2252 reiserfs_warning(sb, "journal-1212",
2253 "REPLAY FAILURE fsck required! "
2254 "buffer write failed");
2255 brelse_array(log_blocks + i,
2256 get_desc_trans_len(desc) - i);
2257 brelse_array(real_blocks, get_desc_trans_len(desc));
2258 brelse(c_bh);
2259 brelse(d_bh);
2260 kfree(log_blocks);
2261 kfree(real_blocks);
2262 return -1;
2263 }
2264 memcpy(real_blocks[i]->b_data, log_blocks[i]->b_data,
2265 real_blocks[i]->b_size);
2266 set_buffer_uptodate(real_blocks[i]);
2267 brelse(log_blocks[i]);
2268 }
2269 /* flush out the real blocks */
2270 for (i = 0; i < get_desc_trans_len(desc); i++) {
2271 set_buffer_dirty(real_blocks[i]);
2272 write_dirty_buffer(real_blocks[i], WRITE);
2273 }
2274 for (i = 0; i < get_desc_trans_len(desc); i++) {
2275 wait_on_buffer(real_blocks[i]);
2276 if (!buffer_uptodate(real_blocks[i])) {
2277 reiserfs_warning(sb, "journal-1226",
2278 "REPLAY FAILURE, fsck required! "
2279 "buffer write failed");
2280 brelse_array(real_blocks + i,
2281 get_desc_trans_len(desc) - i);
2282 brelse(c_bh);
2283 brelse(d_bh);
2284 kfree(log_blocks);
2285 kfree(real_blocks);
2286 return -1;
2287 }
2288 brelse(real_blocks[i]);
2289 }
2290 cur_dblock =
2291 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2292 ((trans_offset + get_desc_trans_len(desc) +
2293 2) % SB_ONDISK_JOURNAL_SIZE(sb));
2294 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2295 "journal-1095: setting journal " "start to offset %ld",
2296 cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb));
2297
2298 /*
2299 * init starting values for the first transaction, in case
2300 * this is the last transaction to be replayed.
2301 */
2302 journal->j_start = cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2303 journal->j_last_flush_trans_id = trans_id;
2304 journal->j_trans_id = trans_id + 1;
2305 /* check for trans_id overflow */
2306 if (journal->j_trans_id == 0)
2307 journal->j_trans_id = 10;
2308 brelse(c_bh);
2309 brelse(d_bh);
2310 kfree(log_blocks);
2311 kfree(real_blocks);
2312 return 0;
2313}
2314
2315/*
2316 * This function reads blocks starting from block and to max_block of bufsize
2317 * size (but no more than BUFNR blocks at a time). This proved to improve
2318 * mounting speed on self-rebuilding raid5 arrays at least.
2319 * Right now it is only used from journal code. But later we might use it
2320 * from other places.
2321 * Note: Do not use journal_getblk/sb_getblk functions here!
2322 */
2323static struct buffer_head *reiserfs_breada(struct block_device *dev,
2324 b_blocknr_t block, int bufsize,
2325 b_blocknr_t max_block)
2326{
2327 struct buffer_head *bhlist[BUFNR];
2328 unsigned int blocks = BUFNR;
2329 struct buffer_head *bh;
2330 int i, j;
2331
2332 bh = __getblk(dev, block, bufsize);
2333 if (buffer_uptodate(bh))
2334 return (bh);
2335
2336 if (block + BUFNR > max_block) {
2337 blocks = max_block - block;
2338 }
2339 bhlist[0] = bh;
2340 j = 1;
2341 for (i = 1; i < blocks; i++) {
2342 bh = __getblk(dev, block + i, bufsize);
2343 if (buffer_uptodate(bh)) {
2344 brelse(bh);
2345 break;
2346 } else
2347 bhlist[j++] = bh;
2348 }
2349 ll_rw_block(READ, j, bhlist);
2350 for (i = 1; i < j; i++)
2351 brelse(bhlist[i]);
2352 bh = bhlist[0];
2353 wait_on_buffer(bh);
2354 if (buffer_uptodate(bh))
2355 return bh;
2356 brelse(bh);
2357 return NULL;
2358}
2359
2360/*
2361 * read and replay the log
2362 * on a clean unmount, the journal header's next unflushed pointer will be
2363 * to an invalid transaction. This tests that before finding all the
2364 * transactions in the log, which makes normal mount times fast.
2365 *
2366 * After a crash, this starts with the next unflushed transaction, and
2367 * replays until it finds one too old, or invalid.
2368 *
2369 * On exit, it sets things up so the first transaction will work correctly.
2370 * NOTE: only called during fs mount
2371 */
2372static int journal_read(struct super_block *sb)
2373{
2374 struct reiserfs_journal *journal = SB_JOURNAL(sb);
2375 struct reiserfs_journal_desc *desc;
2376 unsigned int oldest_trans_id = 0;
2377 unsigned int oldest_invalid_trans_id = 0;
2378 time_t start;
2379 unsigned long oldest_start = 0;
2380 unsigned long cur_dblock = 0;
2381 unsigned long newest_mount_id = 9;
2382 struct buffer_head *d_bh;
2383 struct reiserfs_journal_header *jh;
2384 int valid_journal_header = 0;
2385 int replay_count = 0;
2386 int continue_replay = 1;
2387 int ret;
2388
2389 cur_dblock = SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2390 reiserfs_info(sb, "checking transaction log (%pg)\n",
2391 journal->j_dev_bd);
2392 start = get_seconds();
2393
2394 /*
2395 * step 1, read in the journal header block. Check the transaction
2396 * it says is the first unflushed, and if that transaction is not
2397 * valid, replay is done
2398 */
2399 journal->j_header_bh = journal_bread(sb,
2400 SB_ONDISK_JOURNAL_1st_BLOCK(sb)
2401 + SB_ONDISK_JOURNAL_SIZE(sb));
2402 if (!journal->j_header_bh) {
2403 return 1;
2404 }
2405 jh = (struct reiserfs_journal_header *)(journal->j_header_bh->b_data);
2406 if (le32_to_cpu(jh->j_first_unflushed_offset) <
2407 SB_ONDISK_JOURNAL_SIZE(sb)
2408 && le32_to_cpu(jh->j_last_flush_trans_id) > 0) {
2409 oldest_start =
2410 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2411 le32_to_cpu(jh->j_first_unflushed_offset);
2412 oldest_trans_id = le32_to_cpu(jh->j_last_flush_trans_id) + 1;
2413 newest_mount_id = le32_to_cpu(jh->j_mount_id);
2414 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2415 "journal-1153: found in "
2416 "header: first_unflushed_offset %d, last_flushed_trans_id "
2417 "%lu", le32_to_cpu(jh->j_first_unflushed_offset),
2418 le32_to_cpu(jh->j_last_flush_trans_id));
2419 valid_journal_header = 1;
2420
2421 /*
2422 * now, we try to read the first unflushed offset. If it
2423 * is not valid, there is nothing more we can do, and it
2424 * makes no sense to read through the whole log.
2425 */
2426 d_bh =
2427 journal_bread(sb,
2428 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2429 le32_to_cpu(jh->j_first_unflushed_offset));
2430 ret = journal_transaction_is_valid(sb, d_bh, NULL, NULL);
2431 if (!ret) {
2432 continue_replay = 0;
2433 }
2434 brelse(d_bh);
2435 goto start_log_replay;
2436 }
2437
2438 /*
2439 * ok, there are transactions that need to be replayed. start
2440 * with the first log block, find all the valid transactions, and
2441 * pick out the oldest.
2442 */
2443 while (continue_replay
2444 && cur_dblock <
2445 (SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2446 SB_ONDISK_JOURNAL_SIZE(sb))) {
2447 /*
2448 * Note that it is required for blocksize of primary fs
2449 * device and journal device to be the same
2450 */
2451 d_bh =
2452 reiserfs_breada(journal->j_dev_bd, cur_dblock,
2453 sb->s_blocksize,
2454 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2455 SB_ONDISK_JOURNAL_SIZE(sb));
2456 ret =
2457 journal_transaction_is_valid(sb, d_bh,
2458 &oldest_invalid_trans_id,
2459 &newest_mount_id);
2460 if (ret == 1) {
2461 desc = (struct reiserfs_journal_desc *)d_bh->b_data;
2462 if (oldest_start == 0) { /* init all oldest_ values */
2463 oldest_trans_id = get_desc_trans_id(desc);
2464 oldest_start = d_bh->b_blocknr;
2465 newest_mount_id = get_desc_mount_id(desc);
2466 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2467 "journal-1179: Setting "
2468 "oldest_start to offset %llu, trans_id %lu",
2469 oldest_start -
2470 SB_ONDISK_JOURNAL_1st_BLOCK
2471 (sb), oldest_trans_id);
2472 } else if (oldest_trans_id > get_desc_trans_id(desc)) {
2473 /* one we just read was older */
2474 oldest_trans_id = get_desc_trans_id(desc);
2475 oldest_start = d_bh->b_blocknr;
2476 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2477 "journal-1180: Resetting "
2478 "oldest_start to offset %lu, trans_id %lu",
2479 oldest_start -
2480 SB_ONDISK_JOURNAL_1st_BLOCK
2481 (sb), oldest_trans_id);
2482 }
2483 if (newest_mount_id < get_desc_mount_id(desc)) {
2484 newest_mount_id = get_desc_mount_id(desc);
2485 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2486 "journal-1299: Setting "
2487 "newest_mount_id to %d",
2488 get_desc_mount_id(desc));
2489 }
2490 cur_dblock += get_desc_trans_len(desc) + 2;
2491 } else {
2492 cur_dblock++;
2493 }
2494 brelse(d_bh);
2495 }
2496
2497start_log_replay:
2498 cur_dblock = oldest_start;
2499 if (oldest_trans_id) {
2500 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2501 "journal-1206: Starting replay "
2502 "from offset %llu, trans_id %lu",
2503 cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2504 oldest_trans_id);
2505
2506 }
2507 replay_count = 0;
2508 while (continue_replay && oldest_trans_id > 0) {
2509 ret =
2510 journal_read_transaction(sb, cur_dblock, oldest_start,
2511 oldest_trans_id, newest_mount_id);
2512 if (ret < 0) {
2513 return ret;
2514 } else if (ret != 0) {
2515 break;
2516 }
2517 cur_dblock =
2518 SB_ONDISK_JOURNAL_1st_BLOCK(sb) + journal->j_start;
2519 replay_count++;
2520 if (cur_dblock == oldest_start)
2521 break;
2522 }
2523
2524 if (oldest_trans_id == 0) {
2525 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2526 "journal-1225: No valid " "transactions found");
2527 }
2528 /*
2529 * j_start does not get set correctly if we don't replay any
2530 * transactions. if we had a valid journal_header, set j_start
2531 * to the first unflushed transaction value, copy the trans_id
2532 * from the header
2533 */
2534 if (valid_journal_header && replay_count == 0) {
2535 journal->j_start = le32_to_cpu(jh->j_first_unflushed_offset);
2536 journal->j_trans_id =
2537 le32_to_cpu(jh->j_last_flush_trans_id) + 1;
2538 /* check for trans_id overflow */
2539 if (journal->j_trans_id == 0)
2540 journal->j_trans_id = 10;
2541 journal->j_last_flush_trans_id =
2542 le32_to_cpu(jh->j_last_flush_trans_id);
2543 journal->j_mount_id = le32_to_cpu(jh->j_mount_id) + 1;
2544 } else {
2545 journal->j_mount_id = newest_mount_id + 1;
2546 }
2547 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1299: Setting "
2548 "newest_mount_id to %lu", journal->j_mount_id);
2549 journal->j_first_unflushed_offset = journal->j_start;
2550 if (replay_count > 0) {
2551 reiserfs_info(sb,
2552 "replayed %d transactions in %lu seconds\n",
2553 replay_count, get_seconds() - start);
2554 }
2555 /* needed to satisfy the locking in _update_journal_header_block */
2556 reiserfs_write_lock(sb);
2557 if (!bdev_read_only(sb->s_bdev) &&
2558 _update_journal_header_block(sb, journal->j_start,
2559 journal->j_last_flush_trans_id)) {
2560 reiserfs_write_unlock(sb);
2561 /*
2562 * replay failed, caller must call free_journal_ram and abort
2563 * the mount
2564 */
2565 return -1;
2566 }
2567 reiserfs_write_unlock(sb);
2568 return 0;
2569}
2570
2571static struct reiserfs_journal_list *alloc_journal_list(struct super_block *s)
2572{
2573 struct reiserfs_journal_list *jl;
2574 jl = kzalloc(sizeof(struct reiserfs_journal_list),
2575 GFP_NOFS | __GFP_NOFAIL);
2576 INIT_LIST_HEAD(&jl->j_list);
2577 INIT_LIST_HEAD(&jl->j_working_list);
2578 INIT_LIST_HEAD(&jl->j_tail_bh_list);
2579 INIT_LIST_HEAD(&jl->j_bh_list);
2580 mutex_init(&jl->j_commit_mutex);
2581 SB_JOURNAL(s)->j_num_lists++;
2582 get_journal_list(jl);
2583 return jl;
2584}
2585
2586static void journal_list_init(struct super_block *sb)
2587{
2588 SB_JOURNAL(sb)->j_current_jl = alloc_journal_list(sb);
2589}
2590
2591static void release_journal_dev(struct super_block *super,
2592 struct reiserfs_journal *journal)
2593{
2594 if (journal->j_dev_bd != NULL) {
2595 blkdev_put(journal->j_dev_bd, journal->j_dev_mode);
2596 journal->j_dev_bd = NULL;
2597 }
2598}
2599
2600static int journal_init_dev(struct super_block *super,
2601 struct reiserfs_journal *journal,
2602 const char *jdev_name)
2603{
2604 int result;
2605 dev_t jdev;
2606 fmode_t blkdev_mode = FMODE_READ | FMODE_WRITE | FMODE_EXCL;
2607 char b[BDEVNAME_SIZE];
2608
2609 result = 0;
2610
2611 journal->j_dev_bd = NULL;
2612 jdev = SB_ONDISK_JOURNAL_DEVICE(super) ?
2613 new_decode_dev(SB_ONDISK_JOURNAL_DEVICE(super)) : super->s_dev;
2614
2615 if (bdev_read_only(super->s_bdev))
2616 blkdev_mode = FMODE_READ;
2617
2618 /* there is no "jdev" option and journal is on separate device */
2619 if ((!jdev_name || !jdev_name[0])) {
2620 if (jdev == super->s_dev)
2621 blkdev_mode &= ~FMODE_EXCL;
2622 journal->j_dev_bd = blkdev_get_by_dev(jdev, blkdev_mode,
2623 journal);
2624 journal->j_dev_mode = blkdev_mode;
2625 if (IS_ERR(journal->j_dev_bd)) {
2626 result = PTR_ERR(journal->j_dev_bd);
2627 journal->j_dev_bd = NULL;
2628 reiserfs_warning(super, "sh-458",
2629 "cannot init journal device '%s': %i",
2630 __bdevname(jdev, b), result);
2631 return result;
2632 } else if (jdev != super->s_dev)
2633 set_blocksize(journal->j_dev_bd, super->s_blocksize);
2634
2635 return 0;
2636 }
2637
2638 journal->j_dev_mode = blkdev_mode;
2639 journal->j_dev_bd = blkdev_get_by_path(jdev_name, blkdev_mode, journal);
2640 if (IS_ERR(journal->j_dev_bd)) {
2641 result = PTR_ERR(journal->j_dev_bd);
2642 journal->j_dev_bd = NULL;
2643 reiserfs_warning(super,
2644 "journal_init_dev: Cannot open '%s': %i",
2645 jdev_name, result);
2646 return result;
2647 }
2648
2649 set_blocksize(journal->j_dev_bd, super->s_blocksize);
2650 reiserfs_info(super,
2651 "journal_init_dev: journal device: %pg\n",
2652 journal->j_dev_bd);
2653 return 0;
2654}
2655
2656/*
2657 * When creating/tuning a file system user can assign some
2658 * journal params within boundaries which depend on the ratio
2659 * blocksize/standard_blocksize.
2660 *
2661 * For blocks >= standard_blocksize transaction size should
2662 * be not less then JOURNAL_TRANS_MIN_DEFAULT, and not more
2663 * then JOURNAL_TRANS_MAX_DEFAULT.
2664 *
2665 * For blocks < standard_blocksize these boundaries should be
2666 * decreased proportionally.
2667 */
2668#define REISERFS_STANDARD_BLKSIZE (4096)
2669
2670static int check_advise_trans_params(struct super_block *sb,
2671 struct reiserfs_journal *journal)
2672{
2673 if (journal->j_trans_max) {
2674 /* Non-default journal params. Do sanity check for them. */
2675 int ratio = 1;
2676 if (sb->s_blocksize < REISERFS_STANDARD_BLKSIZE)
2677 ratio = REISERFS_STANDARD_BLKSIZE / sb->s_blocksize;
2678
2679 if (journal->j_trans_max > JOURNAL_TRANS_MAX_DEFAULT / ratio ||
2680 journal->j_trans_max < JOURNAL_TRANS_MIN_DEFAULT / ratio ||
2681 SB_ONDISK_JOURNAL_SIZE(sb) / journal->j_trans_max <
2682 JOURNAL_MIN_RATIO) {
2683 reiserfs_warning(sb, "sh-462",
2684 "bad transaction max size (%u). "
2685 "FSCK?", journal->j_trans_max);
2686 return 1;
2687 }
2688 if (journal->j_max_batch != (journal->j_trans_max) *
2689 JOURNAL_MAX_BATCH_DEFAULT/JOURNAL_TRANS_MAX_DEFAULT) {
2690 reiserfs_warning(sb, "sh-463",
2691 "bad transaction max batch (%u). "
2692 "FSCK?", journal->j_max_batch);
2693 return 1;
2694 }
2695 } else {
2696 /*
2697 * Default journal params.
2698 * The file system was created by old version
2699 * of mkreiserfs, so some fields contain zeros,
2700 * and we need to advise proper values for them
2701 */
2702 if (sb->s_blocksize != REISERFS_STANDARD_BLKSIZE) {
2703 reiserfs_warning(sb, "sh-464", "bad blocksize (%u)",
2704 sb->s_blocksize);
2705 return 1;
2706 }
2707 journal->j_trans_max = JOURNAL_TRANS_MAX_DEFAULT;
2708 journal->j_max_batch = JOURNAL_MAX_BATCH_DEFAULT;
2709 journal->j_max_commit_age = JOURNAL_MAX_COMMIT_AGE;
2710 }
2711 return 0;
2712}
2713
2714/* must be called once on fs mount. calls journal_read for you */
2715int journal_init(struct super_block *sb, const char *j_dev_name,
2716 int old_format, unsigned int commit_max_age)
2717{
2718 int num_cnodes = SB_ONDISK_JOURNAL_SIZE(sb) * 2;
2719 struct buffer_head *bhjh;
2720 struct reiserfs_super_block *rs;
2721 struct reiserfs_journal_header *jh;
2722 struct reiserfs_journal *journal;
2723 struct reiserfs_journal_list *jl;
2724 int ret;
2725
2726 journal = SB_JOURNAL(sb) = vzalloc(sizeof(struct reiserfs_journal));
2727 if (!journal) {
2728 reiserfs_warning(sb, "journal-1256",
2729 "unable to get memory for journal structure");
2730 return 1;
2731 }
2732 INIT_LIST_HEAD(&journal->j_bitmap_nodes);
2733 INIT_LIST_HEAD(&journal->j_prealloc_list);
2734 INIT_LIST_HEAD(&journal->j_working_list);
2735 INIT_LIST_HEAD(&journal->j_journal_list);
2736 journal->j_persistent_trans = 0;
2737 if (reiserfs_allocate_list_bitmaps(sb, journal->j_list_bitmap,
2738 reiserfs_bmap_count(sb)))
2739 goto free_and_return;
2740
2741 allocate_bitmap_nodes(sb);
2742
2743 /* reserved for journal area support */
2744 SB_JOURNAL_1st_RESERVED_BLOCK(sb) = (old_format ?
2745 REISERFS_OLD_DISK_OFFSET_IN_BYTES
2746 / sb->s_blocksize +
2747 reiserfs_bmap_count(sb) +
2748 1 :
2749 REISERFS_DISK_OFFSET_IN_BYTES /
2750 sb->s_blocksize + 2);
2751
2752 /*
2753 * Sanity check to see is the standard journal fitting
2754 * within first bitmap (actual for small blocksizes)
2755 */
2756 if (!SB_ONDISK_JOURNAL_DEVICE(sb) &&
2757 (SB_JOURNAL_1st_RESERVED_BLOCK(sb) +
2758 SB_ONDISK_JOURNAL_SIZE(sb) > sb->s_blocksize * 8)) {
2759 reiserfs_warning(sb, "journal-1393",
2760 "journal does not fit for area addressed "
2761 "by first of bitmap blocks. It starts at "
2762 "%u and its size is %u. Block size %ld",
2763 SB_JOURNAL_1st_RESERVED_BLOCK(sb),
2764 SB_ONDISK_JOURNAL_SIZE(sb),
2765 sb->s_blocksize);
2766 goto free_and_return;
2767 }
2768
2769 if (journal_init_dev(sb, journal, j_dev_name) != 0) {
2770 reiserfs_warning(sb, "sh-462",
2771 "unable to initialize journal device");
2772 goto free_and_return;
2773 }
2774
2775 rs = SB_DISK_SUPER_BLOCK(sb);
2776
2777 /* read journal header */
2778 bhjh = journal_bread(sb,
2779 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2780 SB_ONDISK_JOURNAL_SIZE(sb));
2781 if (!bhjh) {
2782 reiserfs_warning(sb, "sh-459",
2783 "unable to read journal header");
2784 goto free_and_return;
2785 }
2786 jh = (struct reiserfs_journal_header *)(bhjh->b_data);
2787
2788 /* make sure that journal matches to the super block */
2789 if (is_reiserfs_jr(rs)
2790 && (le32_to_cpu(jh->jh_journal.jp_journal_magic) !=
2791 sb_jp_journal_magic(rs))) {
2792 reiserfs_warning(sb, "sh-460",
2793 "journal header magic %x (device %pg) does "
2794 "not match to magic found in super block %x",
2795 jh->jh_journal.jp_journal_magic,
2796 journal->j_dev_bd,
2797 sb_jp_journal_magic(rs));
2798 brelse(bhjh);
2799 goto free_and_return;
2800 }
2801
2802 journal->j_trans_max = le32_to_cpu(jh->jh_journal.jp_journal_trans_max);
2803 journal->j_max_batch = le32_to_cpu(jh->jh_journal.jp_journal_max_batch);
2804 journal->j_max_commit_age =
2805 le32_to_cpu(jh->jh_journal.jp_journal_max_commit_age);
2806 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
2807
2808 if (check_advise_trans_params(sb, journal) != 0)
2809 goto free_and_return;
2810 journal->j_default_max_commit_age = journal->j_max_commit_age;
2811
2812 if (commit_max_age != 0) {
2813 journal->j_max_commit_age = commit_max_age;
2814 journal->j_max_trans_age = commit_max_age;
2815 }
2816
2817 reiserfs_info(sb, "journal params: device %pg, size %u, "
2818 "journal first block %u, max trans len %u, max batch %u, "
2819 "max commit age %u, max trans age %u\n",
2820 journal->j_dev_bd,
2821 SB_ONDISK_JOURNAL_SIZE(sb),
2822 SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2823 journal->j_trans_max,
2824 journal->j_max_batch,
2825 journal->j_max_commit_age, journal->j_max_trans_age);
2826
2827 brelse(bhjh);
2828
2829 journal->j_list_bitmap_index = 0;
2830 journal_list_init(sb);
2831
2832 memset(journal->j_list_hash_table, 0,
2833 JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *));
2834
2835 INIT_LIST_HEAD(&journal->j_dirty_buffers);
2836 spin_lock_init(&journal->j_dirty_buffers_lock);
2837
2838 journal->j_start = 0;
2839 journal->j_len = 0;
2840 journal->j_len_alloc = 0;
2841 atomic_set(&journal->j_wcount, 0);
2842 atomic_set(&journal->j_async_throttle, 0);
2843 journal->j_bcount = 0;
2844 journal->j_trans_start_time = 0;
2845 journal->j_last = NULL;
2846 journal->j_first = NULL;
2847 init_waitqueue_head(&journal->j_join_wait);
2848 mutex_init(&journal->j_mutex);
2849 mutex_init(&journal->j_flush_mutex);
2850
2851 journal->j_trans_id = 10;
2852 journal->j_mount_id = 10;
2853 journal->j_state = 0;
2854 atomic_set(&journal->j_jlock, 0);
2855 journal->j_cnode_free_list = allocate_cnodes(num_cnodes);
2856 journal->j_cnode_free_orig = journal->j_cnode_free_list;
2857 journal->j_cnode_free = journal->j_cnode_free_list ? num_cnodes : 0;
2858 journal->j_cnode_used = 0;
2859 journal->j_must_wait = 0;
2860
2861 if (journal->j_cnode_free == 0) {
2862 reiserfs_warning(sb, "journal-2004", "Journal cnode memory "
2863 "allocation failed (%ld bytes). Journal is "
2864 "too large for available memory. Usually "
2865 "this is due to a journal that is too large.",
2866 sizeof (struct reiserfs_journal_cnode) * num_cnodes);
2867 goto free_and_return;
2868 }
2869
2870 init_journal_hash(sb);
2871 jl = journal->j_current_jl;
2872
2873 /*
2874 * get_list_bitmap() may call flush_commit_list() which
2875 * requires the lock. Calling flush_commit_list() shouldn't happen
2876 * this early but I like to be paranoid.
2877 */
2878 reiserfs_write_lock(sb);
2879 jl->j_list_bitmap = get_list_bitmap(sb, jl);
2880 reiserfs_write_unlock(sb);
2881 if (!jl->j_list_bitmap) {
2882 reiserfs_warning(sb, "journal-2005",
2883 "get_list_bitmap failed for journal list 0");
2884 goto free_and_return;
2885 }
2886
2887 ret = journal_read(sb);
2888 if (ret < 0) {
2889 reiserfs_warning(sb, "reiserfs-2006",
2890 "Replay Failure, unable to mount");
2891 goto free_and_return;
2892 }
2893
2894 INIT_DELAYED_WORK(&journal->j_work, flush_async_commits);
2895 journal->j_work_sb = sb;
2896 return 0;
2897free_and_return:
2898 free_journal_ram(sb);
2899 return 1;
2900}
2901
2902/*
2903 * test for a polite end of the current transaction. Used by file_write,
2904 * and should be used by delete to make sure they don't write more than
2905 * can fit inside a single transaction
2906 */
2907int journal_transaction_should_end(struct reiserfs_transaction_handle *th,
2908 int new_alloc)
2909{
2910 struct reiserfs_journal *journal = SB_JOURNAL(th->t_super);
2911 time_t now = get_seconds();
2912 /* cannot restart while nested */
2913 BUG_ON(!th->t_trans_id);
2914 if (th->t_refcount > 1)
2915 return 0;
2916 if (journal->j_must_wait > 0 ||
2917 (journal->j_len_alloc + new_alloc) >= journal->j_max_batch ||
2918 atomic_read(&journal->j_jlock) ||
2919 (now - journal->j_trans_start_time) > journal->j_max_trans_age ||
2920 journal->j_cnode_free < (journal->j_trans_max * 3)) {
2921 return 1;
2922 }
2923
2924 journal->j_len_alloc += new_alloc;
2925 th->t_blocks_allocated += new_alloc ;
2926 return 0;
2927}
2928
2929/* this must be called inside a transaction */
2930void reiserfs_block_writes(struct reiserfs_transaction_handle *th)
2931{
2932 struct reiserfs_journal *journal = SB_JOURNAL(th->t_super);
2933 BUG_ON(!th->t_trans_id);
2934 journal->j_must_wait = 1;
2935 set_bit(J_WRITERS_BLOCKED, &journal->j_state);
2936 return;
2937}
2938
2939/* this must be called without a transaction started */
2940void reiserfs_allow_writes(struct super_block *s)
2941{
2942 struct reiserfs_journal *journal = SB_JOURNAL(s);
2943 clear_bit(J_WRITERS_BLOCKED, &journal->j_state);
2944 wake_up(&journal->j_join_wait);
2945}
2946
2947/* this must be called without a transaction started */
2948void reiserfs_wait_on_write_block(struct super_block *s)
2949{
2950 struct reiserfs_journal *journal = SB_JOURNAL(s);
2951 wait_event(journal->j_join_wait,
2952 !test_bit(J_WRITERS_BLOCKED, &journal->j_state));
2953}
2954
2955static void queue_log_writer(struct super_block *s)
2956{
2957 wait_queue_t wait;
2958 struct reiserfs_journal *journal = SB_JOURNAL(s);
2959 set_bit(J_WRITERS_QUEUED, &journal->j_state);
2960
2961 /*
2962 * we don't want to use wait_event here because
2963 * we only want to wait once.
2964 */
2965 init_waitqueue_entry(&wait, current);
2966 add_wait_queue(&journal->j_join_wait, &wait);
2967 set_current_state(TASK_UNINTERRUPTIBLE);
2968 if (test_bit(J_WRITERS_QUEUED, &journal->j_state)) {
2969 int depth = reiserfs_write_unlock_nested(s);
2970 schedule();
2971 reiserfs_write_lock_nested(s, depth);
2972 }
2973 __set_current_state(TASK_RUNNING);
2974 remove_wait_queue(&journal->j_join_wait, &wait);
2975}
2976
2977static void wake_queued_writers(struct super_block *s)
2978{
2979 struct reiserfs_journal *journal = SB_JOURNAL(s);
2980 if (test_and_clear_bit(J_WRITERS_QUEUED, &journal->j_state))
2981 wake_up(&journal->j_join_wait);
2982}
2983
2984static void let_transaction_grow(struct super_block *sb, unsigned int trans_id)
2985{
2986 struct reiserfs_journal *journal = SB_JOURNAL(sb);
2987 unsigned long bcount = journal->j_bcount;
2988 while (1) {
2989 int depth;
2990
2991 depth = reiserfs_write_unlock_nested(sb);
2992 schedule_timeout_uninterruptible(1);
2993 reiserfs_write_lock_nested(sb, depth);
2994
2995 journal->j_current_jl->j_state |= LIST_COMMIT_PENDING;
2996 while ((atomic_read(&journal->j_wcount) > 0 ||
2997 atomic_read(&journal->j_jlock)) &&
2998 journal->j_trans_id == trans_id) {
2999 queue_log_writer(sb);
3000 }
3001 if (journal->j_trans_id != trans_id)
3002 break;
3003 if (bcount == journal->j_bcount)
3004 break;
3005 bcount = journal->j_bcount;
3006 }
3007}
3008
3009/*
3010 * join == true if you must join an existing transaction.
3011 * join == false if you can deal with waiting for others to finish
3012 *
3013 * this will block until the transaction is joinable. send the number of
3014 * blocks you expect to use in nblocks.
3015*/
3016static int do_journal_begin_r(struct reiserfs_transaction_handle *th,
3017 struct super_block *sb, unsigned long nblocks,
3018 int join)
3019{
3020 time_t now = get_seconds();
3021 unsigned int old_trans_id;
3022 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3023 struct reiserfs_transaction_handle myth;
3024 int sched_count = 0;
3025 int retval;
3026 int depth;
3027
3028 reiserfs_check_lock_depth(sb, "journal_begin");
3029 BUG_ON(nblocks > journal->j_trans_max);
3030
3031 PROC_INFO_INC(sb, journal.journal_being);
3032 /* set here for journal_join */
3033 th->t_refcount = 1;
3034 th->t_super = sb;
3035
3036relock:
3037 lock_journal(sb);
3038 if (join != JBEGIN_ABORT && reiserfs_is_journal_aborted(journal)) {
3039 unlock_journal(sb);
3040 retval = journal->j_errno;
3041 goto out_fail;
3042 }
3043 journal->j_bcount++;
3044
3045 if (test_bit(J_WRITERS_BLOCKED, &journal->j_state)) {
3046 unlock_journal(sb);
3047 depth = reiserfs_write_unlock_nested(sb);
3048 reiserfs_wait_on_write_block(sb);
3049 reiserfs_write_lock_nested(sb, depth);
3050 PROC_INFO_INC(sb, journal.journal_relock_writers);
3051 goto relock;
3052 }
3053 now = get_seconds();
3054
3055 /*
3056 * if there is no room in the journal OR
3057 * if this transaction is too old, and we weren't called joinable,
3058 * wait for it to finish before beginning we don't sleep if there
3059 * aren't other writers
3060 */
3061
3062 if ((!join && journal->j_must_wait > 0) ||
3063 (!join
3064 && (journal->j_len_alloc + nblocks + 2) >= journal->j_max_batch)
3065 || (!join && atomic_read(&journal->j_wcount) > 0
3066 && journal->j_trans_start_time > 0
3067 && (now - journal->j_trans_start_time) >
3068 journal->j_max_trans_age) || (!join
3069 && atomic_read(&journal->j_jlock))
3070 || (!join && journal->j_cnode_free < (journal->j_trans_max * 3))) {
3071
3072 old_trans_id = journal->j_trans_id;
3073 /* allow others to finish this transaction */
3074 unlock_journal(sb);
3075
3076 if (!join && (journal->j_len_alloc + nblocks + 2) >=
3077 journal->j_max_batch &&
3078 ((journal->j_len + nblocks + 2) * 100) <
3079 (journal->j_len_alloc * 75)) {
3080 if (atomic_read(&journal->j_wcount) > 10) {
3081 sched_count++;
3082 queue_log_writer(sb);
3083 goto relock;
3084 }
3085 }
3086 /*
3087 * don't mess with joining the transaction if all we
3088 * have to do is wait for someone else to do a commit
3089 */
3090 if (atomic_read(&journal->j_jlock)) {
3091 while (journal->j_trans_id == old_trans_id &&
3092 atomic_read(&journal->j_jlock)) {
3093 queue_log_writer(sb);
3094 }
3095 goto relock;
3096 }
3097 retval = journal_join(&myth, sb);
3098 if (retval)
3099 goto out_fail;
3100
3101 /* someone might have ended the transaction while we joined */
3102 if (old_trans_id != journal->j_trans_id) {
3103 retval = do_journal_end(&myth, 0);
3104 } else {
3105 retval = do_journal_end(&myth, COMMIT_NOW);
3106 }
3107
3108 if (retval)
3109 goto out_fail;
3110
3111 PROC_INFO_INC(sb, journal.journal_relock_wcount);
3112 goto relock;
3113 }
3114 /* we are the first writer, set trans_id */
3115 if (journal->j_trans_start_time == 0) {
3116 journal->j_trans_start_time = get_seconds();
3117 }
3118 atomic_inc(&journal->j_wcount);
3119 journal->j_len_alloc += nblocks;
3120 th->t_blocks_logged = 0;
3121 th->t_blocks_allocated = nblocks;
3122 th->t_trans_id = journal->j_trans_id;
3123 unlock_journal(sb);
3124 INIT_LIST_HEAD(&th->t_list);
3125 return 0;
3126
3127out_fail:
3128 memset(th, 0, sizeof(*th));
3129 /*
3130 * Re-set th->t_super, so we can properly keep track of how many
3131 * persistent transactions there are. We need to do this so if this
3132 * call is part of a failed restart_transaction, we can free it later
3133 */
3134 th->t_super = sb;
3135 return retval;
3136}
3137
3138struct reiserfs_transaction_handle *reiserfs_persistent_transaction(struct
3139 super_block
3140 *s,
3141 int nblocks)
3142{
3143 int ret;
3144 struct reiserfs_transaction_handle *th;
3145
3146 /*
3147 * if we're nesting into an existing transaction. It will be
3148 * persistent on its own
3149 */
3150 if (reiserfs_transaction_running(s)) {
3151 th = current->journal_info;
3152 th->t_refcount++;
3153 BUG_ON(th->t_refcount < 2);
3154
3155 return th;
3156 }
3157 th = kmalloc(sizeof(struct reiserfs_transaction_handle), GFP_NOFS);
3158 if (!th)
3159 return NULL;
3160 ret = journal_begin(th, s, nblocks);
3161 if (ret) {
3162 kfree(th);
3163 return NULL;
3164 }
3165
3166 SB_JOURNAL(s)->j_persistent_trans++;
3167 return th;
3168}
3169
3170int reiserfs_end_persistent_transaction(struct reiserfs_transaction_handle *th)
3171{
3172 struct super_block *s = th->t_super;
3173 int ret = 0;
3174 if (th->t_trans_id)
3175 ret = journal_end(th);
3176 else
3177 ret = -EIO;
3178 if (th->t_refcount == 0) {
3179 SB_JOURNAL(s)->j_persistent_trans--;
3180 kfree(th);
3181 }
3182 return ret;
3183}
3184
3185static int journal_join(struct reiserfs_transaction_handle *th,
3186 struct super_block *sb)
3187{
3188 struct reiserfs_transaction_handle *cur_th = current->journal_info;
3189
3190 /*
3191 * this keeps do_journal_end from NULLing out the
3192 * current->journal_info pointer
3193 */
3194 th->t_handle_save = cur_th;
3195 BUG_ON(cur_th && cur_th->t_refcount > 1);
3196 return do_journal_begin_r(th, sb, 1, JBEGIN_JOIN);
3197}
3198
3199int journal_join_abort(struct reiserfs_transaction_handle *th,
3200 struct super_block *sb)
3201{
3202 struct reiserfs_transaction_handle *cur_th = current->journal_info;
3203
3204 /*
3205 * this keeps do_journal_end from NULLing out the
3206 * current->journal_info pointer
3207 */
3208 th->t_handle_save = cur_th;
3209 BUG_ON(cur_th && cur_th->t_refcount > 1);
3210 return do_journal_begin_r(th, sb, 1, JBEGIN_ABORT);
3211}
3212
3213int journal_begin(struct reiserfs_transaction_handle *th,
3214 struct super_block *sb, unsigned long nblocks)
3215{
3216 struct reiserfs_transaction_handle *cur_th = current->journal_info;
3217 int ret;
3218
3219 th->t_handle_save = NULL;
3220 if (cur_th) {
3221 /* we are nesting into the current transaction */
3222 if (cur_th->t_super == sb) {
3223 BUG_ON(!cur_th->t_refcount);
3224 cur_th->t_refcount++;
3225 memcpy(th, cur_th, sizeof(*th));
3226 if (th->t_refcount <= 1)
3227 reiserfs_warning(sb, "reiserfs-2005",
3228 "BAD: refcount <= 1, but "
3229 "journal_info != 0");
3230 return 0;
3231 } else {
3232 /*
3233 * we've ended up with a handle from a different
3234 * filesystem. save it and restore on journal_end.
3235 * This should never really happen...
3236 */
3237 reiserfs_warning(sb, "clm-2100",
3238 "nesting info a different FS");
3239 th->t_handle_save = current->journal_info;
3240 current->journal_info = th;
3241 }
3242 } else {
3243 current->journal_info = th;
3244 }
3245 ret = do_journal_begin_r(th, sb, nblocks, JBEGIN_REG);
3246 BUG_ON(current->journal_info != th);
3247
3248 /*
3249 * I guess this boils down to being the reciprocal of clm-2100 above.
3250 * If do_journal_begin_r fails, we need to put it back, since
3251 * journal_end won't be called to do it. */
3252 if (ret)
3253 current->journal_info = th->t_handle_save;
3254 else
3255 BUG_ON(!th->t_refcount);
3256
3257 return ret;
3258}
3259
3260/*
3261 * puts bh into the current transaction. If it was already there, reorders
3262 * removes the old pointers from the hash, and puts new ones in (to make
3263 * sure replay happen in the right order).
3264 *
3265 * if it was dirty, cleans and files onto the clean list. I can't let it
3266 * be dirty again until the transaction is committed.
3267 *
3268 * if j_len, is bigger than j_len_alloc, it pushes j_len_alloc to 10 + j_len.
3269 */
3270int journal_mark_dirty(struct reiserfs_transaction_handle *th,
3271 struct buffer_head *bh)
3272{
3273 struct super_block *sb = th->t_super;
3274 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3275 struct reiserfs_journal_cnode *cn = NULL;
3276 int count_already_incd = 0;
3277 int prepared = 0;
3278 BUG_ON(!th->t_trans_id);
3279
3280 PROC_INFO_INC(sb, journal.mark_dirty);
3281 if (th->t_trans_id != journal->j_trans_id) {
3282 reiserfs_panic(th->t_super, "journal-1577",
3283 "handle trans id %ld != current trans id %ld",
3284 th->t_trans_id, journal->j_trans_id);
3285 }
3286
3287 prepared = test_clear_buffer_journal_prepared(bh);
3288 clear_buffer_journal_restore_dirty(bh);
3289 /* already in this transaction, we are done */
3290 if (buffer_journaled(bh)) {
3291 PROC_INFO_INC(sb, journal.mark_dirty_already);
3292 return 0;
3293 }
3294
3295 /*
3296 * this must be turned into a panic instead of a warning. We can't
3297 * allow a dirty or journal_dirty or locked buffer to be logged, as
3298 * some changes could get to disk too early. NOT GOOD.
3299 */
3300 if (!prepared || buffer_dirty(bh)) {
3301 reiserfs_warning(sb, "journal-1777",
3302 "buffer %llu bad state "
3303 "%cPREPARED %cLOCKED %cDIRTY %cJDIRTY_WAIT",
3304 (unsigned long long)bh->b_blocknr,
3305 prepared ? ' ' : '!',
3306 buffer_locked(bh) ? ' ' : '!',
3307 buffer_dirty(bh) ? ' ' : '!',
3308 buffer_journal_dirty(bh) ? ' ' : '!');
3309 }
3310
3311 if (atomic_read(&journal->j_wcount) <= 0) {
3312 reiserfs_warning(sb, "journal-1409",
3313 "returning because j_wcount was %d",
3314 atomic_read(&journal->j_wcount));
3315 return 1;
3316 }
3317 /*
3318 * this error means I've screwed up, and we've overflowed
3319 * the transaction. Nothing can be done here, except make the
3320 * FS readonly or panic.
3321 */
3322 if (journal->j_len >= journal->j_trans_max) {
3323 reiserfs_panic(th->t_super, "journal-1413",
3324 "j_len (%lu) is too big",
3325 journal->j_len);
3326 }
3327
3328 if (buffer_journal_dirty(bh)) {
3329 count_already_incd = 1;
3330 PROC_INFO_INC(sb, journal.mark_dirty_notjournal);
3331 clear_buffer_journal_dirty(bh);
3332 }
3333
3334 if (journal->j_len > journal->j_len_alloc) {
3335 journal->j_len_alloc = journal->j_len + JOURNAL_PER_BALANCE_CNT;
3336 }
3337
3338 set_buffer_journaled(bh);
3339
3340 /* now put this guy on the end */
3341 if (!cn) {
3342 cn = get_cnode(sb);
3343 if (!cn) {
3344 reiserfs_panic(sb, "journal-4", "get_cnode failed!");
3345 }
3346
3347 if (th->t_blocks_logged == th->t_blocks_allocated) {
3348 th->t_blocks_allocated += JOURNAL_PER_BALANCE_CNT;
3349 journal->j_len_alloc += JOURNAL_PER_BALANCE_CNT;
3350 }
3351 th->t_blocks_logged++;
3352 journal->j_len++;
3353
3354 cn->bh = bh;
3355 cn->blocknr = bh->b_blocknr;
3356 cn->sb = sb;
3357 cn->jlist = NULL;
3358 insert_journal_hash(journal->j_hash_table, cn);
3359 if (!count_already_incd) {
3360 get_bh(bh);
3361 }
3362 }
3363 cn->next = NULL;
3364 cn->prev = journal->j_last;
3365 cn->bh = bh;
3366 if (journal->j_last) {
3367 journal->j_last->next = cn;
3368 journal->j_last = cn;
3369 } else {
3370 journal->j_first = cn;
3371 journal->j_last = cn;
3372 }
3373 reiserfs_schedule_old_flush(sb);
3374 return 0;
3375}
3376
3377int journal_end(struct reiserfs_transaction_handle *th)
3378{
3379 struct super_block *sb = th->t_super;
3380 if (!current->journal_info && th->t_refcount > 1)
3381 reiserfs_warning(sb, "REISER-NESTING",
3382 "th NULL, refcount %d", th->t_refcount);
3383
3384 if (!th->t_trans_id) {
3385 WARN_ON(1);
3386 return -EIO;
3387 }
3388
3389 th->t_refcount--;
3390 if (th->t_refcount > 0) {
3391 struct reiserfs_transaction_handle *cur_th =
3392 current->journal_info;
3393
3394 /*
3395 * we aren't allowed to close a nested transaction on a
3396 * different filesystem from the one in the task struct
3397 */
3398 BUG_ON(cur_th->t_super != th->t_super);
3399
3400 if (th != cur_th) {
3401 memcpy(current->journal_info, th, sizeof(*th));
3402 th->t_trans_id = 0;
3403 }
3404 return 0;
3405 } else {
3406 return do_journal_end(th, 0);
3407 }
3408}
3409
3410/*
3411 * removes from the current transaction, relsing and descrementing any counters.
3412 * also files the removed buffer directly onto the clean list
3413 *
3414 * called by journal_mark_freed when a block has been deleted
3415 *
3416 * returns 1 if it cleaned and relsed the buffer. 0 otherwise
3417 */
3418static int remove_from_transaction(struct super_block *sb,
3419 b_blocknr_t blocknr, int already_cleaned)
3420{
3421 struct buffer_head *bh;
3422 struct reiserfs_journal_cnode *cn;
3423 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3424 int ret = 0;
3425
3426 cn = get_journal_hash_dev(sb, journal->j_hash_table, blocknr);
3427 if (!cn || !cn->bh) {
3428 return ret;
3429 }
3430 bh = cn->bh;
3431 if (cn->prev) {
3432 cn->prev->next = cn->next;
3433 }
3434 if (cn->next) {
3435 cn->next->prev = cn->prev;
3436 }
3437 if (cn == journal->j_first) {
3438 journal->j_first = cn->next;
3439 }
3440 if (cn == journal->j_last) {
3441 journal->j_last = cn->prev;
3442 }
3443 if (bh)
3444 remove_journal_hash(sb, journal->j_hash_table, NULL,
3445 bh->b_blocknr, 0);
3446 clear_buffer_journaled(bh); /* don't log this one */
3447
3448 if (!already_cleaned) {
3449 clear_buffer_journal_dirty(bh);
3450 clear_buffer_dirty(bh);
3451 clear_buffer_journal_test(bh);
3452 put_bh(bh);
3453 if (atomic_read(&bh->b_count) < 0) {
3454 reiserfs_warning(sb, "journal-1752",
3455 "b_count < 0");
3456 }
3457 ret = 1;
3458 }
3459 journal->j_len--;
3460 journal->j_len_alloc--;
3461 free_cnode(sb, cn);
3462 return ret;
3463}
3464
3465/*
3466 * for any cnode in a journal list, it can only be dirtied of all the
3467 * transactions that include it are committed to disk.
3468 * this checks through each transaction, and returns 1 if you are allowed
3469 * to dirty, and 0 if you aren't
3470 *
3471 * it is called by dirty_journal_list, which is called after
3472 * flush_commit_list has gotten all the log blocks for a given
3473 * transaction on disk
3474 *
3475 */
3476static int can_dirty(struct reiserfs_journal_cnode *cn)
3477{
3478 struct super_block *sb = cn->sb;
3479 b_blocknr_t blocknr = cn->blocknr;
3480 struct reiserfs_journal_cnode *cur = cn->hprev;
3481 int can_dirty = 1;
3482
3483 /*
3484 * first test hprev. These are all newer than cn, so any node here
3485 * with the same block number and dev means this node can't be sent
3486 * to disk right now.
3487 */
3488 while (cur && can_dirty) {
3489 if (cur->jlist && cur->bh && cur->blocknr && cur->sb == sb &&
3490 cur->blocknr == blocknr) {
3491 can_dirty = 0;
3492 }
3493 cur = cur->hprev;
3494 }
3495 /*
3496 * then test hnext. These are all older than cn. As long as they
3497 * are committed to the log, it is safe to write cn to disk
3498 */
3499 cur = cn->hnext;
3500 while (cur && can_dirty) {
3501 if (cur->jlist && cur->jlist->j_len > 0 &&
3502 atomic_read(&cur->jlist->j_commit_left) > 0 && cur->bh &&
3503 cur->blocknr && cur->sb == sb && cur->blocknr == blocknr) {
3504 can_dirty = 0;
3505 }
3506 cur = cur->hnext;
3507 }
3508 return can_dirty;
3509}
3510
3511/*
3512 * syncs the commit blocks, but does not force the real buffers to disk
3513 * will wait until the current transaction is done/committed before returning
3514 */
3515int journal_end_sync(struct reiserfs_transaction_handle *th)
3516{
3517 struct super_block *sb = th->t_super;
3518 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3519
3520 BUG_ON(!th->t_trans_id);
3521 /* you can sync while nested, very, very bad */
3522 BUG_ON(th->t_refcount > 1);
3523 if (journal->j_len == 0) {
3524 reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
3525 1);
3526 journal_mark_dirty(th, SB_BUFFER_WITH_SB(sb));
3527 }
3528 return do_journal_end(th, COMMIT_NOW | WAIT);
3529}
3530
3531/* writeback the pending async commits to disk */
3532static void flush_async_commits(struct work_struct *work)
3533{
3534 struct reiserfs_journal *journal =
3535 container_of(work, struct reiserfs_journal, j_work.work);
3536 struct super_block *sb = journal->j_work_sb;
3537 struct reiserfs_journal_list *jl;
3538 struct list_head *entry;
3539
3540 reiserfs_write_lock(sb);
3541 if (!list_empty(&journal->j_journal_list)) {
3542 /* last entry is the youngest, commit it and you get everything */
3543 entry = journal->j_journal_list.prev;
3544 jl = JOURNAL_LIST_ENTRY(entry);
3545 flush_commit_list(sb, jl, 1);
3546 }
3547 reiserfs_write_unlock(sb);
3548}
3549
3550/*
3551 * flushes any old transactions to disk
3552 * ends the current transaction if it is too old
3553 */
3554void reiserfs_flush_old_commits(struct super_block *sb)
3555{
3556 time_t now;
3557 struct reiserfs_transaction_handle th;
3558 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3559
3560 now = get_seconds();
3561 /*
3562 * safety check so we don't flush while we are replaying the log during
3563 * mount
3564 */
3565 if (list_empty(&journal->j_journal_list))
3566 return;
3567
3568 /*
3569 * check the current transaction. If there are no writers, and it is
3570 * too old, finish it, and force the commit blocks to disk
3571 */
3572 if (atomic_read(&journal->j_wcount) <= 0 &&
3573 journal->j_trans_start_time > 0 &&
3574 journal->j_len > 0 &&
3575 (now - journal->j_trans_start_time) > journal->j_max_trans_age) {
3576 if (!journal_join(&th, sb)) {
3577 reiserfs_prepare_for_journal(sb,
3578 SB_BUFFER_WITH_SB(sb),
3579 1);
3580 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(sb));
3581
3582 /*
3583 * we're only being called from kreiserfsd, it makes
3584 * no sense to do an async commit so that kreiserfsd
3585 * can do it later
3586 */
3587 do_journal_end(&th, COMMIT_NOW | WAIT);
3588 }
3589 }
3590}
3591
3592/*
3593 * returns 0 if do_journal_end should return right away, returns 1 if
3594 * do_journal_end should finish the commit
3595 *
3596 * if the current transaction is too old, but still has writers, this will
3597 * wait on j_join_wait until all the writers are done. By the time it
3598 * wakes up, the transaction it was called has already ended, so it just
3599 * flushes the commit list and returns 0.
3600 *
3601 * Won't batch when flush or commit_now is set. Also won't batch when
3602 * others are waiting on j_join_wait.
3603 *
3604 * Note, we can't allow the journal_end to proceed while there are still
3605 * writers in the log.
3606 */
3607static int check_journal_end(struct reiserfs_transaction_handle *th, int flags)
3608{
3609
3610 time_t now;
3611 int flush = flags & FLUSH_ALL;
3612 int commit_now = flags & COMMIT_NOW;
3613 int wait_on_commit = flags & WAIT;
3614 struct reiserfs_journal_list *jl;
3615 struct super_block *sb = th->t_super;
3616 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3617
3618 BUG_ON(!th->t_trans_id);
3619
3620 if (th->t_trans_id != journal->j_trans_id) {
3621 reiserfs_panic(th->t_super, "journal-1577",
3622 "handle trans id %ld != current trans id %ld",
3623 th->t_trans_id, journal->j_trans_id);
3624 }
3625
3626 journal->j_len_alloc -= (th->t_blocks_allocated - th->t_blocks_logged);
3627 /* <= 0 is allowed. unmounting might not call begin */
3628 if (atomic_read(&journal->j_wcount) > 0)
3629 atomic_dec(&journal->j_wcount);
3630
3631 /*
3632 * BUG, deal with case where j_len is 0, but people previously
3633 * freed blocks need to be released will be dealt with by next
3634 * transaction that actually writes something, but should be taken
3635 * care of in this trans
3636 */
3637 BUG_ON(journal->j_len == 0);
3638
3639 /*
3640 * if wcount > 0, and we are called to with flush or commit_now,
3641 * we wait on j_join_wait. We will wake up when the last writer has
3642 * finished the transaction, and started it on its way to the disk.
3643 * Then, we flush the commit or journal list, and just return 0
3644 * because the rest of journal end was already done for this
3645 * transaction.
3646 */
3647 if (atomic_read(&journal->j_wcount) > 0) {
3648 if (flush || commit_now) {
3649 unsigned trans_id;
3650
3651 jl = journal->j_current_jl;
3652 trans_id = jl->j_trans_id;
3653 if (wait_on_commit)
3654 jl->j_state |= LIST_COMMIT_PENDING;
3655 atomic_set(&journal->j_jlock, 1);
3656 if (flush) {
3657 journal->j_next_full_flush = 1;
3658 }
3659 unlock_journal(sb);
3660
3661 /*
3662 * sleep while the current transaction is
3663 * still j_jlocked
3664 */
3665 while (journal->j_trans_id == trans_id) {
3666 if (atomic_read(&journal->j_jlock)) {
3667 queue_log_writer(sb);
3668 } else {
3669 lock_journal(sb);
3670 if (journal->j_trans_id == trans_id) {
3671 atomic_set(&journal->j_jlock,
3672 1);
3673 }
3674 unlock_journal(sb);
3675 }
3676 }
3677 BUG_ON(journal->j_trans_id == trans_id);
3678
3679 if (commit_now
3680 && journal_list_still_alive(sb, trans_id)
3681 && wait_on_commit) {
3682 flush_commit_list(sb, jl, 1);
3683 }
3684 return 0;
3685 }
3686 unlock_journal(sb);
3687 return 0;
3688 }
3689
3690 /* deal with old transactions where we are the last writers */
3691 now = get_seconds();
3692 if ((now - journal->j_trans_start_time) > journal->j_max_trans_age) {
3693 commit_now = 1;
3694 journal->j_next_async_flush = 1;
3695 }
3696 /* don't batch when someone is waiting on j_join_wait */
3697 /* don't batch when syncing the commit or flushing the whole trans */
3698 if (!(journal->j_must_wait > 0) && !(atomic_read(&journal->j_jlock))
3699 && !flush && !commit_now && (journal->j_len < journal->j_max_batch)
3700 && journal->j_len_alloc < journal->j_max_batch
3701 && journal->j_cnode_free > (journal->j_trans_max * 3)) {
3702 journal->j_bcount++;
3703 unlock_journal(sb);
3704 return 0;
3705 }
3706
3707 if (journal->j_start > SB_ONDISK_JOURNAL_SIZE(sb)) {
3708 reiserfs_panic(sb, "journal-003",
3709 "j_start (%ld) is too high",
3710 journal->j_start);
3711 }
3712 return 1;
3713}
3714
3715/*
3716 * Does all the work that makes deleting blocks safe.
3717 * when deleting a block mark BH_JNew, just remove it from the current
3718 * transaction, clean it's buffer_head and move on.
3719 *
3720 * otherwise:
3721 * set a bit for the block in the journal bitmap. That will prevent it from
3722 * being allocated for unformatted nodes before this transaction has finished.
3723 *
3724 * mark any cnodes for this block as BLOCK_FREED, and clear their bh pointers.
3725 * That will prevent any old transactions with this block from trying to flush
3726 * to the real location. Since we aren't removing the cnode from the
3727 * journal_list_hash, *the block can't be reallocated yet.
3728 *
3729 * Then remove it from the current transaction, decrementing any counters and
3730 * filing it on the clean list.
3731 */
3732int journal_mark_freed(struct reiserfs_transaction_handle *th,
3733 struct super_block *sb, b_blocknr_t blocknr)
3734{
3735 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3736 struct reiserfs_journal_cnode *cn = NULL;
3737 struct buffer_head *bh = NULL;
3738 struct reiserfs_list_bitmap *jb = NULL;
3739 int cleaned = 0;
3740 BUG_ON(!th->t_trans_id);
3741
3742 cn = get_journal_hash_dev(sb, journal->j_hash_table, blocknr);
3743 if (cn && cn->bh) {
3744 bh = cn->bh;
3745 get_bh(bh);
3746 }
3747 /* if it is journal new, we just remove it from this transaction */
3748 if (bh && buffer_journal_new(bh)) {
3749 clear_buffer_journal_new(bh);
3750 clear_prepared_bits(bh);
3751 reiserfs_clean_and_file_buffer(bh);
3752 cleaned = remove_from_transaction(sb, blocknr, cleaned);
3753 } else {
3754 /*
3755 * set the bit for this block in the journal bitmap
3756 * for this transaction
3757 */
3758 jb = journal->j_current_jl->j_list_bitmap;
3759 if (!jb) {
3760 reiserfs_panic(sb, "journal-1702",
3761 "journal_list_bitmap is NULL");
3762 }
3763 set_bit_in_list_bitmap(sb, blocknr, jb);
3764
3765 /* Note, the entire while loop is not allowed to schedule. */
3766
3767 if (bh) {
3768 clear_prepared_bits(bh);
3769 reiserfs_clean_and_file_buffer(bh);
3770 }
3771 cleaned = remove_from_transaction(sb, blocknr, cleaned);
3772
3773 /*
3774 * find all older transactions with this block,
3775 * make sure they don't try to write it out
3776 */
3777 cn = get_journal_hash_dev(sb, journal->j_list_hash_table,
3778 blocknr);
3779 while (cn) {
3780 if (sb == cn->sb && blocknr == cn->blocknr) {
3781 set_bit(BLOCK_FREED, &cn->state);
3782 if (cn->bh) {
3783 /*
3784 * remove_from_transaction will brelse
3785 * the buffer if it was in the current
3786 * trans
3787 */
3788 if (!cleaned) {
3789 clear_buffer_journal_dirty(cn->
3790 bh);
3791 clear_buffer_dirty(cn->bh);
3792 clear_buffer_journal_test(cn->
3793 bh);
3794 cleaned = 1;
3795 put_bh(cn->bh);
3796 if (atomic_read
3797 (&cn->bh->b_count) < 0) {
3798 reiserfs_warning(sb,
3799 "journal-2138",
3800 "cn->bh->b_count < 0");
3801 }
3802 }
3803 /*
3804 * since we are clearing the bh,
3805 * we MUST dec nonzerolen
3806 */
3807 if (cn->jlist) {
3808 atomic_dec(&cn->jlist->
3809 j_nonzerolen);
3810 }
3811 cn->bh = NULL;
3812 }
3813 }
3814 cn = cn->hnext;
3815 }
3816 }
3817
3818 if (bh)
3819 release_buffer_page(bh); /* get_hash grabs the buffer */
3820 return 0;
3821}
3822
3823void reiserfs_update_inode_transaction(struct inode *inode)
3824{
3825 struct reiserfs_journal *journal = SB_JOURNAL(inode->i_sb);
3826 REISERFS_I(inode)->i_jl = journal->j_current_jl;
3827 REISERFS_I(inode)->i_trans_id = journal->j_trans_id;
3828}
3829
3830/*
3831 * returns -1 on error, 0 if no commits/barriers were done and 1
3832 * if a transaction was actually committed and the barrier was done
3833 */
3834static int __commit_trans_jl(struct inode *inode, unsigned long id,
3835 struct reiserfs_journal_list *jl)
3836{
3837 struct reiserfs_transaction_handle th;
3838 struct super_block *sb = inode->i_sb;
3839 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3840 int ret = 0;
3841
3842 /*
3843 * is it from the current transaction,
3844 * or from an unknown transaction?
3845 */
3846 if (id == journal->j_trans_id) {
3847 jl = journal->j_current_jl;
3848 /*
3849 * try to let other writers come in and
3850 * grow this transaction
3851 */
3852 let_transaction_grow(sb, id);
3853 if (journal->j_trans_id != id) {
3854 goto flush_commit_only;
3855 }
3856
3857 ret = journal_begin(&th, sb, 1);
3858 if (ret)
3859 return ret;
3860
3861 /* someone might have ended this transaction while we joined */
3862 if (journal->j_trans_id != id) {
3863 reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
3864 1);
3865 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(sb));
3866 ret = journal_end(&th);
3867 goto flush_commit_only;
3868 }
3869
3870 ret = journal_end_sync(&th);
3871 if (!ret)
3872 ret = 1;
3873
3874 } else {
3875 /*
3876 * this gets tricky, we have to make sure the journal list in
3877 * the inode still exists. We know the list is still around
3878 * if we've got a larger transaction id than the oldest list
3879 */
3880flush_commit_only:
3881 if (journal_list_still_alive(inode->i_sb, id)) {
3882 /*
3883 * we only set ret to 1 when we know for sure
3884 * the barrier hasn't been started yet on the commit
3885 * block.
3886 */
3887 if (atomic_read(&jl->j_commit_left) > 1)
3888 ret = 1;
3889 flush_commit_list(sb, jl, 1);
3890 if (journal->j_errno)
3891 ret = journal->j_errno;
3892 }
3893 }
3894 /* otherwise the list is gone, and long since committed */
3895 return ret;
3896}
3897
3898int reiserfs_commit_for_inode(struct inode *inode)
3899{
3900 unsigned int id = REISERFS_I(inode)->i_trans_id;
3901 struct reiserfs_journal_list *jl = REISERFS_I(inode)->i_jl;
3902
3903 /*
3904 * for the whole inode, assume unset id means it was
3905 * changed in the current transaction. More conservative
3906 */
3907 if (!id || !jl) {
3908 reiserfs_update_inode_transaction(inode);
3909 id = REISERFS_I(inode)->i_trans_id;
3910 /* jl will be updated in __commit_trans_jl */
3911 }
3912
3913 return __commit_trans_jl(inode, id, jl);
3914}
3915
3916void reiserfs_restore_prepared_buffer(struct super_block *sb,
3917 struct buffer_head *bh)
3918{
3919 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3920 PROC_INFO_INC(sb, journal.restore_prepared);
3921 if (!bh) {
3922 return;
3923 }
3924 if (test_clear_buffer_journal_restore_dirty(bh) &&
3925 buffer_journal_dirty(bh)) {
3926 struct reiserfs_journal_cnode *cn;
3927 reiserfs_write_lock(sb);
3928 cn = get_journal_hash_dev(sb,
3929 journal->j_list_hash_table,
3930 bh->b_blocknr);
3931 if (cn && can_dirty(cn)) {
3932 set_buffer_journal_test(bh);
3933 mark_buffer_dirty(bh);
3934 }
3935 reiserfs_write_unlock(sb);
3936 }
3937 clear_buffer_journal_prepared(bh);
3938}
3939
3940extern struct tree_balance *cur_tb;
3941/*
3942 * before we can change a metadata block, we have to make sure it won't
3943 * be written to disk while we are altering it. So, we must:
3944 * clean it
3945 * wait on it.
3946 */
3947int reiserfs_prepare_for_journal(struct super_block *sb,
3948 struct buffer_head *bh, int wait)
3949{
3950 PROC_INFO_INC(sb, journal.prepare);
3951
3952 if (!trylock_buffer(bh)) {
3953 if (!wait)
3954 return 0;
3955 lock_buffer(bh);
3956 }
3957 set_buffer_journal_prepared(bh);
3958 if (test_clear_buffer_dirty(bh) && buffer_journal_dirty(bh)) {
3959 clear_buffer_journal_test(bh);
3960 set_buffer_journal_restore_dirty(bh);
3961 }
3962 unlock_buffer(bh);
3963 return 1;
3964}
3965
3966/*
3967 * long and ugly. If flush, will not return until all commit
3968 * blocks and all real buffers in the trans are on disk.
3969 * If no_async, won't return until all commit blocks are on disk.
3970 *
3971 * keep reading, there are comments as you go along
3972 *
3973 * If the journal is aborted, we just clean up. Things like flushing
3974 * journal lists, etc just won't happen.
3975 */
3976static int do_journal_end(struct reiserfs_transaction_handle *th, int flags)
3977{
3978 struct super_block *sb = th->t_super;
3979 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3980 struct reiserfs_journal_cnode *cn, *next, *jl_cn;
3981 struct reiserfs_journal_cnode *last_cn = NULL;
3982 struct reiserfs_journal_desc *desc;
3983 struct reiserfs_journal_commit *commit;
3984 struct buffer_head *c_bh; /* commit bh */
3985 struct buffer_head *d_bh; /* desc bh */
3986 int cur_write_start = 0; /* start index of current log write */
3987 int old_start;
3988 int i;
3989 int flush;
3990 int wait_on_commit;
3991 struct reiserfs_journal_list *jl, *temp_jl;
3992 struct list_head *entry, *safe;
3993 unsigned long jindex;
3994 unsigned int commit_trans_id;
3995 int trans_half;
3996 int depth;
3997
3998 BUG_ON(th->t_refcount > 1);
3999 BUG_ON(!th->t_trans_id);
4000 BUG_ON(!th->t_super);
4001
4002 /*
4003 * protect flush_older_commits from doing mistakes if the
4004 * transaction ID counter gets overflowed.
4005 */
4006 if (th->t_trans_id == ~0U)
4007 flags |= FLUSH_ALL | COMMIT_NOW | WAIT;
4008 flush = flags & FLUSH_ALL;
4009 wait_on_commit = flags & WAIT;
4010
4011 current->journal_info = th->t_handle_save;
4012 reiserfs_check_lock_depth(sb, "journal end");
4013 if (journal->j_len == 0) {
4014 reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
4015 1);
4016 journal_mark_dirty(th, SB_BUFFER_WITH_SB(sb));
4017 }
4018
4019 lock_journal(sb);
4020 if (journal->j_next_full_flush) {
4021 flags |= FLUSH_ALL;
4022 flush = 1;
4023 }
4024 if (journal->j_next_async_flush) {
4025 flags |= COMMIT_NOW | WAIT;
4026 wait_on_commit = 1;
4027 }
4028
4029 /*
4030 * check_journal_end locks the journal, and unlocks if it does
4031 * not return 1 it tells us if we should continue with the
4032 * journal_end, or just return
4033 */
4034 if (!check_journal_end(th, flags)) {
4035 reiserfs_schedule_old_flush(sb);
4036 wake_queued_writers(sb);
4037 reiserfs_async_progress_wait(sb);
4038 goto out;
4039 }
4040
4041 /* check_journal_end might set these, check again */
4042 if (journal->j_next_full_flush) {
4043 flush = 1;
4044 }
4045
4046 /*
4047 * j must wait means we have to flush the log blocks, and the
4048 * real blocks for this transaction
4049 */
4050 if (journal->j_must_wait > 0) {
4051 flush = 1;
4052 }
4053#ifdef REISERFS_PREALLOCATE
4054 /*
4055 * quota ops might need to nest, setup the journal_info pointer
4056 * for them and raise the refcount so that it is > 0.
4057 */
4058 current->journal_info = th;
4059 th->t_refcount++;
4060
4061 /* it should not involve new blocks into the transaction */
4062 reiserfs_discard_all_prealloc(th);
4063
4064 th->t_refcount--;
4065 current->journal_info = th->t_handle_save;
4066#endif
4067
4068 /* setup description block */
4069 d_bh =
4070 journal_getblk(sb,
4071 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
4072 journal->j_start);
4073 set_buffer_uptodate(d_bh);
4074 desc = (struct reiserfs_journal_desc *)(d_bh)->b_data;
4075 memset(d_bh->b_data, 0, d_bh->b_size);
4076 memcpy(get_journal_desc_magic(d_bh), JOURNAL_DESC_MAGIC, 8);
4077 set_desc_trans_id(desc, journal->j_trans_id);
4078
4079 /*
4080 * setup commit block. Don't write (keep it clean too) this one
4081 * until after everyone else is written
4082 */
4083 c_bh = journal_getblk(sb, SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
4084 ((journal->j_start + journal->j_len +
4085 1) % SB_ONDISK_JOURNAL_SIZE(sb)));
4086 commit = (struct reiserfs_journal_commit *)c_bh->b_data;
4087 memset(c_bh->b_data, 0, c_bh->b_size);
4088 set_commit_trans_id(commit, journal->j_trans_id);
4089 set_buffer_uptodate(c_bh);
4090
4091 /* init this journal list */
4092 jl = journal->j_current_jl;
4093
4094 /*
4095 * we lock the commit before doing anything because
4096 * we want to make sure nobody tries to run flush_commit_list until
4097 * the new transaction is fully setup, and we've already flushed the
4098 * ordered bh list
4099 */
4100 reiserfs_mutex_lock_safe(&jl->j_commit_mutex, sb);
4101
4102 /* save the transaction id in case we need to commit it later */
4103 commit_trans_id = jl->j_trans_id;
4104
4105 atomic_set(&jl->j_older_commits_done, 0);
4106 jl->j_trans_id = journal->j_trans_id;
4107 jl->j_timestamp = journal->j_trans_start_time;
4108 jl->j_commit_bh = c_bh;
4109 jl->j_start = journal->j_start;
4110 jl->j_len = journal->j_len;
4111 atomic_set(&jl->j_nonzerolen, journal->j_len);
4112 atomic_set(&jl->j_commit_left, journal->j_len + 2);
4113 jl->j_realblock = NULL;
4114
4115 /*
4116 * The ENTIRE FOR LOOP MUST not cause schedule to occur.
4117 * for each real block, add it to the journal list hash,
4118 * copy into real block index array in the commit or desc block
4119 */
4120 trans_half = journal_trans_half(sb->s_blocksize);
4121 for (i = 0, cn = journal->j_first; cn; cn = cn->next, i++) {
4122 if (buffer_journaled(cn->bh)) {
4123 jl_cn = get_cnode(sb);
4124 if (!jl_cn) {
4125 reiserfs_panic(sb, "journal-1676",
4126 "get_cnode returned NULL");
4127 }
4128 if (i == 0) {
4129 jl->j_realblock = jl_cn;
4130 }
4131 jl_cn->prev = last_cn;
4132 jl_cn->next = NULL;
4133 if (last_cn) {
4134 last_cn->next = jl_cn;
4135 }
4136 last_cn = jl_cn;
4137 /*
4138 * make sure the block we are trying to log
4139 * is not a block of journal or reserved area
4140 */
4141 if (is_block_in_log_or_reserved_area
4142 (sb, cn->bh->b_blocknr)) {
4143 reiserfs_panic(sb, "journal-2332",
4144 "Trying to log block %lu, "
4145 "which is a log block",
4146 cn->bh->b_blocknr);
4147 }
4148 jl_cn->blocknr = cn->bh->b_blocknr;
4149 jl_cn->state = 0;
4150 jl_cn->sb = sb;
4151 jl_cn->bh = cn->bh;
4152 jl_cn->jlist = jl;
4153 insert_journal_hash(journal->j_list_hash_table, jl_cn);
4154 if (i < trans_half) {
4155 desc->j_realblock[i] =
4156 cpu_to_le32(cn->bh->b_blocknr);
4157 } else {
4158 commit->j_realblock[i - trans_half] =
4159 cpu_to_le32(cn->bh->b_blocknr);
4160 }
4161 } else {
4162 i--;
4163 }
4164 }
4165 set_desc_trans_len(desc, journal->j_len);
4166 set_desc_mount_id(desc, journal->j_mount_id);
4167 set_desc_trans_id(desc, journal->j_trans_id);
4168 set_commit_trans_len(commit, journal->j_len);
4169
4170 /*
4171 * special check in case all buffers in the journal
4172 * were marked for not logging
4173 */
4174 BUG_ON(journal->j_len == 0);
4175
4176 /*
4177 * we're about to dirty all the log blocks, mark the description block
4178 * dirty now too. Don't mark the commit block dirty until all the
4179 * others are on disk
4180 */
4181 mark_buffer_dirty(d_bh);
4182
4183 /*
4184 * first data block is j_start + 1, so add one to
4185 * cur_write_start wherever you use it
4186 */
4187 cur_write_start = journal->j_start;
4188 cn = journal->j_first;
4189 jindex = 1; /* start at one so we don't get the desc again */
4190 while (cn) {
4191 clear_buffer_journal_new(cn->bh);
4192 /* copy all the real blocks into log area. dirty log blocks */
4193 if (buffer_journaled(cn->bh)) {
4194 struct buffer_head *tmp_bh;
4195 char *addr;
4196 struct page *page;
4197 tmp_bh =
4198 journal_getblk(sb,
4199 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
4200 ((cur_write_start +
4201 jindex) %
4202 SB_ONDISK_JOURNAL_SIZE(sb)));
4203 set_buffer_uptodate(tmp_bh);
4204 page = cn->bh->b_page;
4205 addr = kmap(page);
4206 memcpy(tmp_bh->b_data,
4207 addr + offset_in_page(cn->bh->b_data),
4208 cn->bh->b_size);
4209 kunmap(page);
4210 mark_buffer_dirty(tmp_bh);
4211 jindex++;
4212 set_buffer_journal_dirty(cn->bh);
4213 clear_buffer_journaled(cn->bh);
4214 } else {
4215 /*
4216 * JDirty cleared sometime during transaction.
4217 * don't log this one
4218 */
4219 reiserfs_warning(sb, "journal-2048",
4220 "BAD, buffer in journal hash, "
4221 "but not JDirty!");
4222 brelse(cn->bh);
4223 }
4224 next = cn->next;
4225 free_cnode(sb, cn);
4226 cn = next;
4227 reiserfs_cond_resched(sb);
4228 }
4229
4230 /*
4231 * we are done with both the c_bh and d_bh, but
4232 * c_bh must be written after all other commit blocks,
4233 * so we dirty/relse c_bh in flush_commit_list, with commit_left <= 1.
4234 */
4235
4236 journal->j_current_jl = alloc_journal_list(sb);
4237
4238 /* now it is safe to insert this transaction on the main list */
4239 list_add_tail(&jl->j_list, &journal->j_journal_list);
4240 list_add_tail(&jl->j_working_list, &journal->j_working_list);
4241 journal->j_num_work_lists++;
4242
4243 /* reset journal values for the next transaction */
4244 old_start = journal->j_start;
4245 journal->j_start =
4246 (journal->j_start + journal->j_len +
4247 2) % SB_ONDISK_JOURNAL_SIZE(sb);
4248 atomic_set(&journal->j_wcount, 0);
4249 journal->j_bcount = 0;
4250 journal->j_last = NULL;
4251 journal->j_first = NULL;
4252 journal->j_len = 0;
4253 journal->j_trans_start_time = 0;
4254 /* check for trans_id overflow */
4255 if (++journal->j_trans_id == 0)
4256 journal->j_trans_id = 10;
4257 journal->j_current_jl->j_trans_id = journal->j_trans_id;
4258 journal->j_must_wait = 0;
4259 journal->j_len_alloc = 0;
4260 journal->j_next_full_flush = 0;
4261 journal->j_next_async_flush = 0;
4262 init_journal_hash(sb);
4263
4264 /*
4265 * make sure reiserfs_add_jh sees the new current_jl before we
4266 * write out the tails
4267 */
4268 smp_mb();
4269
4270 /*
4271 * tail conversion targets have to hit the disk before we end the
4272 * transaction. Otherwise a later transaction might repack the tail
4273 * before this transaction commits, leaving the data block unflushed
4274 * and clean, if we crash before the later transaction commits, the
4275 * data block is lost.
4276 */
4277 if (!list_empty(&jl->j_tail_bh_list)) {
4278 depth = reiserfs_write_unlock_nested(sb);
4279 write_ordered_buffers(&journal->j_dirty_buffers_lock,
4280 journal, jl, &jl->j_tail_bh_list);
4281 reiserfs_write_lock_nested(sb, depth);
4282 }
4283 BUG_ON(!list_empty(&jl->j_tail_bh_list));
4284 mutex_unlock(&jl->j_commit_mutex);
4285
4286 /*
4287 * honor the flush wishes from the caller, simple commits can
4288 * be done outside the journal lock, they are done below
4289 *
4290 * if we don't flush the commit list right now, we put it into
4291 * the work queue so the people waiting on the async progress work
4292 * queue don't wait for this proc to flush journal lists and such.
4293 */
4294 if (flush) {
4295 flush_commit_list(sb, jl, 1);
4296 flush_journal_list(sb, jl, 1);
4297 } else if (!(jl->j_state & LIST_COMMIT_PENDING)) {
4298 /*
4299 * Avoid queueing work when sb is being shut down. Transaction
4300 * will be flushed on journal shutdown.
4301 */
4302 if (sb->s_flags & MS_ACTIVE)
4303 queue_delayed_work(REISERFS_SB(sb)->commit_wq,
4304 &journal->j_work, HZ / 10);
4305 }
4306
4307 /*
4308 * if the next transaction has any chance of wrapping, flush
4309 * transactions that might get overwritten. If any journal lists
4310 * are very old flush them as well.
4311 */
4312first_jl:
4313 list_for_each_safe(entry, safe, &journal->j_journal_list) {
4314 temp_jl = JOURNAL_LIST_ENTRY(entry);
4315 if (journal->j_start <= temp_jl->j_start) {
4316 if ((journal->j_start + journal->j_trans_max + 1) >=
4317 temp_jl->j_start) {
4318 flush_used_journal_lists(sb, temp_jl);
4319 goto first_jl;
4320 } else if ((journal->j_start +
4321 journal->j_trans_max + 1) <
4322 SB_ONDISK_JOURNAL_SIZE(sb)) {
4323 /*
4324 * if we don't cross into the next
4325 * transaction and we don't wrap, there is
4326 * no way we can overlap any later transactions
4327 * break now
4328 */
4329 break;
4330 }
4331 } else if ((journal->j_start +
4332 journal->j_trans_max + 1) >
4333 SB_ONDISK_JOURNAL_SIZE(sb)) {
4334 if (((journal->j_start + journal->j_trans_max + 1) %
4335 SB_ONDISK_JOURNAL_SIZE(sb)) >=
4336 temp_jl->j_start) {
4337 flush_used_journal_lists(sb, temp_jl);
4338 goto first_jl;
4339 } else {
4340 /*
4341 * we don't overlap anything from out start
4342 * to the end of the log, and our wrapped
4343 * portion doesn't overlap anything at
4344 * the start of the log. We can break
4345 */
4346 break;
4347 }
4348 }
4349 }
4350
4351 journal->j_current_jl->j_list_bitmap =
4352 get_list_bitmap(sb, journal->j_current_jl);
4353
4354 if (!(journal->j_current_jl->j_list_bitmap)) {
4355 reiserfs_panic(sb, "journal-1996",
4356 "could not get a list bitmap");
4357 }
4358
4359 atomic_set(&journal->j_jlock, 0);
4360 unlock_journal(sb);
4361 /* wake up any body waiting to join. */
4362 clear_bit(J_WRITERS_QUEUED, &journal->j_state);
4363 wake_up(&journal->j_join_wait);
4364
4365 if (!flush && wait_on_commit &&
4366 journal_list_still_alive(sb, commit_trans_id)) {
4367 flush_commit_list(sb, jl, 1);
4368 }
4369out:
4370 reiserfs_check_lock_depth(sb, "journal end2");
4371
4372 memset(th, 0, sizeof(*th));
4373 /*
4374 * Re-set th->t_super, so we can properly keep track of how many
4375 * persistent transactions there are. We need to do this so if this
4376 * call is part of a failed restart_transaction, we can free it later
4377 */
4378 th->t_super = sb;
4379
4380 return journal->j_errno;
4381}
4382
4383/* Send the file system read only and refuse new transactions */
4384void reiserfs_abort_journal(struct super_block *sb, int errno)
4385{
4386 struct reiserfs_journal *journal = SB_JOURNAL(sb);
4387 if (test_bit(J_ABORTED, &journal->j_state))
4388 return;
4389
4390 if (!journal->j_errno)
4391 journal->j_errno = errno;
4392
4393 sb->s_flags |= MS_RDONLY;
4394 set_bit(J_ABORTED, &journal->j_state);
4395
4396#ifdef CONFIG_REISERFS_CHECK
4397 dump_stack();
4398#endif
4399}
1/*
2** Write ahead logging implementation copyright Chris Mason 2000
3**
4** The background commits make this code very interrelated, and
5** overly complex. I need to rethink things a bit....The major players:
6**
7** journal_begin -- call with the number of blocks you expect to log.
8** If the current transaction is too
9** old, it will block until the current transaction is
10** finished, and then start a new one.
11** Usually, your transaction will get joined in with
12** previous ones for speed.
13**
14** journal_join -- same as journal_begin, but won't block on the current
15** transaction regardless of age. Don't ever call
16** this. Ever. There are only two places it should be
17** called from, and they are both inside this file.
18**
19** journal_mark_dirty -- adds blocks into this transaction. clears any flags
20** that might make them get sent to disk
21** and then marks them BH_JDirty. Puts the buffer head
22** into the current transaction hash.
23**
24** journal_end -- if the current transaction is batchable, it does nothing
25** otherwise, it could do an async/synchronous commit, or
26** a full flush of all log and real blocks in the
27** transaction.
28**
29** flush_old_commits -- if the current transaction is too old, it is ended and
30** commit blocks are sent to disk. Forces commit blocks
31** to disk for all backgrounded commits that have been
32** around too long.
33** -- Note, if you call this as an immediate flush from
34** from within kupdate, it will ignore the immediate flag
35*/
36
37#include <linux/time.h>
38#include <linux/semaphore.h>
39#include <linux/vmalloc.h>
40#include <linux/reiserfs_fs.h>
41#include <linux/kernel.h>
42#include <linux/errno.h>
43#include <linux/fcntl.h>
44#include <linux/stat.h>
45#include <linux/string.h>
46#include <linux/buffer_head.h>
47#include <linux/workqueue.h>
48#include <linux/writeback.h>
49#include <linux/blkdev.h>
50#include <linux/backing-dev.h>
51#include <linux/uaccess.h>
52#include <linux/slab.h>
53
54#include <asm/system.h>
55
56/* gets a struct reiserfs_journal_list * from a list head */
57#define JOURNAL_LIST_ENTRY(h) (list_entry((h), struct reiserfs_journal_list, \
58 j_list))
59#define JOURNAL_WORK_ENTRY(h) (list_entry((h), struct reiserfs_journal_list, \
60 j_working_list))
61
62/* the number of mounted filesystems. This is used to decide when to
63** start and kill the commit workqueue
64*/
65static int reiserfs_mounted_fs_count;
66
67static struct workqueue_struct *commit_wq;
68
69#define JOURNAL_TRANS_HALF 1018 /* must be correct to keep the desc and commit
70 structs at 4k */
71#define BUFNR 64 /*read ahead */
72
73/* cnode stat bits. Move these into reiserfs_fs.h */
74
75#define BLOCK_FREED 2 /* this block was freed, and can't be written. */
76#define BLOCK_FREED_HOLDER 3 /* this block was freed during this transaction, and can't be written */
77
78#define BLOCK_NEEDS_FLUSH 4 /* used in flush_journal_list */
79#define BLOCK_DIRTIED 5
80
81/* journal list state bits */
82#define LIST_TOUCHED 1
83#define LIST_DIRTY 2
84#define LIST_COMMIT_PENDING 4 /* someone will commit this list */
85
86/* flags for do_journal_end */
87#define FLUSH_ALL 1 /* flush commit and real blocks */
88#define COMMIT_NOW 2 /* end and commit this transaction */
89#define WAIT 4 /* wait for the log blocks to hit the disk */
90
91static int do_journal_end(struct reiserfs_transaction_handle *,
92 struct super_block *, unsigned long nblocks,
93 int flags);
94static int flush_journal_list(struct super_block *s,
95 struct reiserfs_journal_list *jl, int flushall);
96static int flush_commit_list(struct super_block *s,
97 struct reiserfs_journal_list *jl, int flushall);
98static int can_dirty(struct reiserfs_journal_cnode *cn);
99static int journal_join(struct reiserfs_transaction_handle *th,
100 struct super_block *sb, unsigned long nblocks);
101static int release_journal_dev(struct super_block *super,
102 struct reiserfs_journal *journal);
103static int dirty_one_transaction(struct super_block *s,
104 struct reiserfs_journal_list *jl);
105static void flush_async_commits(struct work_struct *work);
106static void queue_log_writer(struct super_block *s);
107
108/* values for join in do_journal_begin_r */
109enum {
110 JBEGIN_REG = 0, /* regular journal begin */
111 JBEGIN_JOIN = 1, /* join the running transaction if at all possible */
112 JBEGIN_ABORT = 2, /* called from cleanup code, ignores aborted flag */
113};
114
115static int do_journal_begin_r(struct reiserfs_transaction_handle *th,
116 struct super_block *sb,
117 unsigned long nblocks, int join);
118
119static void init_journal_hash(struct super_block *sb)
120{
121 struct reiserfs_journal *journal = SB_JOURNAL(sb);
122 memset(journal->j_hash_table, 0,
123 JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *));
124}
125
126/*
127** clears BH_Dirty and sticks the buffer on the clean list. Called because I can't allow refile_buffer to
128** make schedule happen after I've freed a block. Look at remove_from_transaction and journal_mark_freed for
129** more details.
130*/
131static int reiserfs_clean_and_file_buffer(struct buffer_head *bh)
132{
133 if (bh) {
134 clear_buffer_dirty(bh);
135 clear_buffer_journal_test(bh);
136 }
137 return 0;
138}
139
140static struct reiserfs_bitmap_node *allocate_bitmap_node(struct super_block
141 *sb)
142{
143 struct reiserfs_bitmap_node *bn;
144 static int id;
145
146 bn = kmalloc(sizeof(struct reiserfs_bitmap_node), GFP_NOFS);
147 if (!bn) {
148 return NULL;
149 }
150 bn->data = kzalloc(sb->s_blocksize, GFP_NOFS);
151 if (!bn->data) {
152 kfree(bn);
153 return NULL;
154 }
155 bn->id = id++;
156 INIT_LIST_HEAD(&bn->list);
157 return bn;
158}
159
160static struct reiserfs_bitmap_node *get_bitmap_node(struct super_block *sb)
161{
162 struct reiserfs_journal *journal = SB_JOURNAL(sb);
163 struct reiserfs_bitmap_node *bn = NULL;
164 struct list_head *entry = journal->j_bitmap_nodes.next;
165
166 journal->j_used_bitmap_nodes++;
167 repeat:
168
169 if (entry != &journal->j_bitmap_nodes) {
170 bn = list_entry(entry, struct reiserfs_bitmap_node, list);
171 list_del(entry);
172 memset(bn->data, 0, sb->s_blocksize);
173 journal->j_free_bitmap_nodes--;
174 return bn;
175 }
176 bn = allocate_bitmap_node(sb);
177 if (!bn) {
178 yield();
179 goto repeat;
180 }
181 return bn;
182}
183static inline void free_bitmap_node(struct super_block *sb,
184 struct reiserfs_bitmap_node *bn)
185{
186 struct reiserfs_journal *journal = SB_JOURNAL(sb);
187 journal->j_used_bitmap_nodes--;
188 if (journal->j_free_bitmap_nodes > REISERFS_MAX_BITMAP_NODES) {
189 kfree(bn->data);
190 kfree(bn);
191 } else {
192 list_add(&bn->list, &journal->j_bitmap_nodes);
193 journal->j_free_bitmap_nodes++;
194 }
195}
196
197static void allocate_bitmap_nodes(struct super_block *sb)
198{
199 int i;
200 struct reiserfs_journal *journal = SB_JOURNAL(sb);
201 struct reiserfs_bitmap_node *bn = NULL;
202 for (i = 0; i < REISERFS_MIN_BITMAP_NODES; i++) {
203 bn = allocate_bitmap_node(sb);
204 if (bn) {
205 list_add(&bn->list, &journal->j_bitmap_nodes);
206 journal->j_free_bitmap_nodes++;
207 } else {
208 break; /* this is ok, we'll try again when more are needed */
209 }
210 }
211}
212
213static int set_bit_in_list_bitmap(struct super_block *sb,
214 b_blocknr_t block,
215 struct reiserfs_list_bitmap *jb)
216{
217 unsigned int bmap_nr = block / (sb->s_blocksize << 3);
218 unsigned int bit_nr = block % (sb->s_blocksize << 3);
219
220 if (!jb->bitmaps[bmap_nr]) {
221 jb->bitmaps[bmap_nr] = get_bitmap_node(sb);
222 }
223 set_bit(bit_nr, (unsigned long *)jb->bitmaps[bmap_nr]->data);
224 return 0;
225}
226
227static void cleanup_bitmap_list(struct super_block *sb,
228 struct reiserfs_list_bitmap *jb)
229{
230 int i;
231 if (jb->bitmaps == NULL)
232 return;
233
234 for (i = 0; i < reiserfs_bmap_count(sb); i++) {
235 if (jb->bitmaps[i]) {
236 free_bitmap_node(sb, jb->bitmaps[i]);
237 jb->bitmaps[i] = NULL;
238 }
239 }
240}
241
242/*
243** only call this on FS unmount.
244*/
245static int free_list_bitmaps(struct super_block *sb,
246 struct reiserfs_list_bitmap *jb_array)
247{
248 int i;
249 struct reiserfs_list_bitmap *jb;
250 for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
251 jb = jb_array + i;
252 jb->journal_list = NULL;
253 cleanup_bitmap_list(sb, jb);
254 vfree(jb->bitmaps);
255 jb->bitmaps = NULL;
256 }
257 return 0;
258}
259
260static int free_bitmap_nodes(struct super_block *sb)
261{
262 struct reiserfs_journal *journal = SB_JOURNAL(sb);
263 struct list_head *next = journal->j_bitmap_nodes.next;
264 struct reiserfs_bitmap_node *bn;
265
266 while (next != &journal->j_bitmap_nodes) {
267 bn = list_entry(next, struct reiserfs_bitmap_node, list);
268 list_del(next);
269 kfree(bn->data);
270 kfree(bn);
271 next = journal->j_bitmap_nodes.next;
272 journal->j_free_bitmap_nodes--;
273 }
274
275 return 0;
276}
277
278/*
279** get memory for JOURNAL_NUM_BITMAPS worth of bitmaps.
280** jb_array is the array to be filled in.
281*/
282int reiserfs_allocate_list_bitmaps(struct super_block *sb,
283 struct reiserfs_list_bitmap *jb_array,
284 unsigned int bmap_nr)
285{
286 int i;
287 int failed = 0;
288 struct reiserfs_list_bitmap *jb;
289 int mem = bmap_nr * sizeof(struct reiserfs_bitmap_node *);
290
291 for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
292 jb = jb_array + i;
293 jb->journal_list = NULL;
294 jb->bitmaps = vmalloc(mem);
295 if (!jb->bitmaps) {
296 reiserfs_warning(sb, "clm-2000", "unable to "
297 "allocate bitmaps for journal lists");
298 failed = 1;
299 break;
300 }
301 memset(jb->bitmaps, 0, mem);
302 }
303 if (failed) {
304 free_list_bitmaps(sb, jb_array);
305 return -1;
306 }
307 return 0;
308}
309
310/*
311** find an available list bitmap. If you can't find one, flush a commit list
312** and try again
313*/
314static struct reiserfs_list_bitmap *get_list_bitmap(struct super_block *sb,
315 struct reiserfs_journal_list
316 *jl)
317{
318 int i, j;
319 struct reiserfs_journal *journal = SB_JOURNAL(sb);
320 struct reiserfs_list_bitmap *jb = NULL;
321
322 for (j = 0; j < (JOURNAL_NUM_BITMAPS * 3); j++) {
323 i = journal->j_list_bitmap_index;
324 journal->j_list_bitmap_index = (i + 1) % JOURNAL_NUM_BITMAPS;
325 jb = journal->j_list_bitmap + i;
326 if (journal->j_list_bitmap[i].journal_list) {
327 flush_commit_list(sb,
328 journal->j_list_bitmap[i].
329 journal_list, 1);
330 if (!journal->j_list_bitmap[i].journal_list) {
331 break;
332 }
333 } else {
334 break;
335 }
336 }
337 if (jb->journal_list) { /* double check to make sure if flushed correctly */
338 return NULL;
339 }
340 jb->journal_list = jl;
341 return jb;
342}
343
344/*
345** allocates a new chunk of X nodes, and links them all together as a list.
346** Uses the cnode->next and cnode->prev pointers
347** returns NULL on failure
348*/
349static struct reiserfs_journal_cnode *allocate_cnodes(int num_cnodes)
350{
351 struct reiserfs_journal_cnode *head;
352 int i;
353 if (num_cnodes <= 0) {
354 return NULL;
355 }
356 head = vmalloc(num_cnodes * sizeof(struct reiserfs_journal_cnode));
357 if (!head) {
358 return NULL;
359 }
360 memset(head, 0, num_cnodes * sizeof(struct reiserfs_journal_cnode));
361 head[0].prev = NULL;
362 head[0].next = head + 1;
363 for (i = 1; i < num_cnodes; i++) {
364 head[i].prev = head + (i - 1);
365 head[i].next = head + (i + 1); /* if last one, overwrite it after the if */
366 }
367 head[num_cnodes - 1].next = NULL;
368 return head;
369}
370
371/*
372** pulls a cnode off the free list, or returns NULL on failure
373*/
374static struct reiserfs_journal_cnode *get_cnode(struct super_block *sb)
375{
376 struct reiserfs_journal_cnode *cn;
377 struct reiserfs_journal *journal = SB_JOURNAL(sb);
378
379 reiserfs_check_lock_depth(sb, "get_cnode");
380
381 if (journal->j_cnode_free <= 0) {
382 return NULL;
383 }
384 journal->j_cnode_used++;
385 journal->j_cnode_free--;
386 cn = journal->j_cnode_free_list;
387 if (!cn) {
388 return cn;
389 }
390 if (cn->next) {
391 cn->next->prev = NULL;
392 }
393 journal->j_cnode_free_list = cn->next;
394 memset(cn, 0, sizeof(struct reiserfs_journal_cnode));
395 return cn;
396}
397
398/*
399** returns a cnode to the free list
400*/
401static void free_cnode(struct super_block *sb,
402 struct reiserfs_journal_cnode *cn)
403{
404 struct reiserfs_journal *journal = SB_JOURNAL(sb);
405
406 reiserfs_check_lock_depth(sb, "free_cnode");
407
408 journal->j_cnode_used--;
409 journal->j_cnode_free++;
410 /* memset(cn, 0, sizeof(struct reiserfs_journal_cnode)) ; */
411 cn->next = journal->j_cnode_free_list;
412 if (journal->j_cnode_free_list) {
413 journal->j_cnode_free_list->prev = cn;
414 }
415 cn->prev = NULL; /* not needed with the memset, but I might kill the memset, and forget to do this */
416 journal->j_cnode_free_list = cn;
417}
418
419static void clear_prepared_bits(struct buffer_head *bh)
420{
421 clear_buffer_journal_prepared(bh);
422 clear_buffer_journal_restore_dirty(bh);
423}
424
425/* return a cnode with same dev, block number and size in table, or null if not found */
426static inline struct reiserfs_journal_cnode *get_journal_hash_dev(struct
427 super_block
428 *sb,
429 struct
430 reiserfs_journal_cnode
431 **table,
432 long bl)
433{
434 struct reiserfs_journal_cnode *cn;
435 cn = journal_hash(table, sb, bl);
436 while (cn) {
437 if (cn->blocknr == bl && cn->sb == sb)
438 return cn;
439 cn = cn->hnext;
440 }
441 return (struct reiserfs_journal_cnode *)0;
442}
443
444/*
445** this actually means 'can this block be reallocated yet?'. If you set search_all, a block can only be allocated
446** if it is not in the current transaction, was not freed by the current transaction, and has no chance of ever
447** being overwritten by a replay after crashing.
448**
449** If you don't set search_all, a block can only be allocated if it is not in the current transaction. Since deleting
450** a block removes it from the current transaction, this case should never happen. If you don't set search_all, make
451** sure you never write the block without logging it.
452**
453** next_zero_bit is a suggestion about the next block to try for find_forward.
454** when bl is rejected because it is set in a journal list bitmap, we search
455** for the next zero bit in the bitmap that rejected bl. Then, we return that
456** through next_zero_bit for find_forward to try.
457**
458** Just because we return something in next_zero_bit does not mean we won't
459** reject it on the next call to reiserfs_in_journal
460**
461*/
462int reiserfs_in_journal(struct super_block *sb,
463 unsigned int bmap_nr, int bit_nr, int search_all,
464 b_blocknr_t * next_zero_bit)
465{
466 struct reiserfs_journal *journal = SB_JOURNAL(sb);
467 struct reiserfs_journal_cnode *cn;
468 struct reiserfs_list_bitmap *jb;
469 int i;
470 unsigned long bl;
471
472 *next_zero_bit = 0; /* always start this at zero. */
473
474 PROC_INFO_INC(sb, journal.in_journal);
475 /* If we aren't doing a search_all, this is a metablock, and it will be logged before use.
476 ** if we crash before the transaction that freed it commits, this transaction won't
477 ** have committed either, and the block will never be written
478 */
479 if (search_all) {
480 for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
481 PROC_INFO_INC(sb, journal.in_journal_bitmap);
482 jb = journal->j_list_bitmap + i;
483 if (jb->journal_list && jb->bitmaps[bmap_nr] &&
484 test_bit(bit_nr,
485 (unsigned long *)jb->bitmaps[bmap_nr]->
486 data)) {
487 *next_zero_bit =
488 find_next_zero_bit((unsigned long *)
489 (jb->bitmaps[bmap_nr]->
490 data),
491 sb->s_blocksize << 3,
492 bit_nr + 1);
493 return 1;
494 }
495 }
496 }
497
498 bl = bmap_nr * (sb->s_blocksize << 3) + bit_nr;
499 /* is it in any old transactions? */
500 if (search_all
501 && (cn =
502 get_journal_hash_dev(sb, journal->j_list_hash_table, bl))) {
503 return 1;
504 }
505
506 /* is it in the current transaction. This should never happen */
507 if ((cn = get_journal_hash_dev(sb, journal->j_hash_table, bl))) {
508 BUG();
509 return 1;
510 }
511
512 PROC_INFO_INC(sb, journal.in_journal_reusable);
513 /* safe for reuse */
514 return 0;
515}
516
517/* insert cn into table
518*/
519static inline void insert_journal_hash(struct reiserfs_journal_cnode **table,
520 struct reiserfs_journal_cnode *cn)
521{
522 struct reiserfs_journal_cnode *cn_orig;
523
524 cn_orig = journal_hash(table, cn->sb, cn->blocknr);
525 cn->hnext = cn_orig;
526 cn->hprev = NULL;
527 if (cn_orig) {
528 cn_orig->hprev = cn;
529 }
530 journal_hash(table, cn->sb, cn->blocknr) = cn;
531}
532
533/* lock the current transaction */
534static inline void lock_journal(struct super_block *sb)
535{
536 PROC_INFO_INC(sb, journal.lock_journal);
537
538 reiserfs_mutex_lock_safe(&SB_JOURNAL(sb)->j_mutex, sb);
539}
540
541/* unlock the current transaction */
542static inline void unlock_journal(struct super_block *sb)
543{
544 mutex_unlock(&SB_JOURNAL(sb)->j_mutex);
545}
546
547static inline void get_journal_list(struct reiserfs_journal_list *jl)
548{
549 jl->j_refcount++;
550}
551
552static inline void put_journal_list(struct super_block *s,
553 struct reiserfs_journal_list *jl)
554{
555 if (jl->j_refcount < 1) {
556 reiserfs_panic(s, "journal-2", "trans id %u, refcount at %d",
557 jl->j_trans_id, jl->j_refcount);
558 }
559 if (--jl->j_refcount == 0)
560 kfree(jl);
561}
562
563/*
564** this used to be much more involved, and I'm keeping it just in case things get ugly again.
565** it gets called by flush_commit_list, and cleans up any data stored about blocks freed during a
566** transaction.
567*/
568static void cleanup_freed_for_journal_list(struct super_block *sb,
569 struct reiserfs_journal_list *jl)
570{
571
572 struct reiserfs_list_bitmap *jb = jl->j_list_bitmap;
573 if (jb) {
574 cleanup_bitmap_list(sb, jb);
575 }
576 jl->j_list_bitmap->journal_list = NULL;
577 jl->j_list_bitmap = NULL;
578}
579
580static int journal_list_still_alive(struct super_block *s,
581 unsigned int trans_id)
582{
583 struct reiserfs_journal *journal = SB_JOURNAL(s);
584 struct list_head *entry = &journal->j_journal_list;
585 struct reiserfs_journal_list *jl;
586
587 if (!list_empty(entry)) {
588 jl = JOURNAL_LIST_ENTRY(entry->next);
589 if (jl->j_trans_id <= trans_id) {
590 return 1;
591 }
592 }
593 return 0;
594}
595
596/*
597 * If page->mapping was null, we failed to truncate this page for
598 * some reason. Most likely because it was truncated after being
599 * logged via data=journal.
600 *
601 * This does a check to see if the buffer belongs to one of these
602 * lost pages before doing the final put_bh. If page->mapping was
603 * null, it tries to free buffers on the page, which should make the
604 * final page_cache_release drop the page from the lru.
605 */
606static void release_buffer_page(struct buffer_head *bh)
607{
608 struct page *page = bh->b_page;
609 if (!page->mapping && trylock_page(page)) {
610 page_cache_get(page);
611 put_bh(bh);
612 if (!page->mapping)
613 try_to_free_buffers(page);
614 unlock_page(page);
615 page_cache_release(page);
616 } else {
617 put_bh(bh);
618 }
619}
620
621static void reiserfs_end_buffer_io_sync(struct buffer_head *bh, int uptodate)
622{
623 char b[BDEVNAME_SIZE];
624
625 if (buffer_journaled(bh)) {
626 reiserfs_warning(NULL, "clm-2084",
627 "pinned buffer %lu:%s sent to disk",
628 bh->b_blocknr, bdevname(bh->b_bdev, b));
629 }
630 if (uptodate)
631 set_buffer_uptodate(bh);
632 else
633 clear_buffer_uptodate(bh);
634
635 unlock_buffer(bh);
636 release_buffer_page(bh);
637}
638
639static void reiserfs_end_ordered_io(struct buffer_head *bh, int uptodate)
640{
641 if (uptodate)
642 set_buffer_uptodate(bh);
643 else
644 clear_buffer_uptodate(bh);
645 unlock_buffer(bh);
646 put_bh(bh);
647}
648
649static void submit_logged_buffer(struct buffer_head *bh)
650{
651 get_bh(bh);
652 bh->b_end_io = reiserfs_end_buffer_io_sync;
653 clear_buffer_journal_new(bh);
654 clear_buffer_dirty(bh);
655 if (!test_clear_buffer_journal_test(bh))
656 BUG();
657 if (!buffer_uptodate(bh))
658 BUG();
659 submit_bh(WRITE, bh);
660}
661
662static void submit_ordered_buffer(struct buffer_head *bh)
663{
664 get_bh(bh);
665 bh->b_end_io = reiserfs_end_ordered_io;
666 clear_buffer_dirty(bh);
667 if (!buffer_uptodate(bh))
668 BUG();
669 submit_bh(WRITE, bh);
670}
671
672#define CHUNK_SIZE 32
673struct buffer_chunk {
674 struct buffer_head *bh[CHUNK_SIZE];
675 int nr;
676};
677
678static void write_chunk(struct buffer_chunk *chunk)
679{
680 int i;
681 for (i = 0; i < chunk->nr; i++) {
682 submit_logged_buffer(chunk->bh[i]);
683 }
684 chunk->nr = 0;
685}
686
687static void write_ordered_chunk(struct buffer_chunk *chunk)
688{
689 int i;
690 for (i = 0; i < chunk->nr; i++) {
691 submit_ordered_buffer(chunk->bh[i]);
692 }
693 chunk->nr = 0;
694}
695
696static int add_to_chunk(struct buffer_chunk *chunk, struct buffer_head *bh,
697 spinlock_t * lock, void (fn) (struct buffer_chunk *))
698{
699 int ret = 0;
700 BUG_ON(chunk->nr >= CHUNK_SIZE);
701 chunk->bh[chunk->nr++] = bh;
702 if (chunk->nr >= CHUNK_SIZE) {
703 ret = 1;
704 if (lock)
705 spin_unlock(lock);
706 fn(chunk);
707 if (lock)
708 spin_lock(lock);
709 }
710 return ret;
711}
712
713static atomic_t nr_reiserfs_jh = ATOMIC_INIT(0);
714static struct reiserfs_jh *alloc_jh(void)
715{
716 struct reiserfs_jh *jh;
717 while (1) {
718 jh = kmalloc(sizeof(*jh), GFP_NOFS);
719 if (jh) {
720 atomic_inc(&nr_reiserfs_jh);
721 return jh;
722 }
723 yield();
724 }
725}
726
727/*
728 * we want to free the jh when the buffer has been written
729 * and waited on
730 */
731void reiserfs_free_jh(struct buffer_head *bh)
732{
733 struct reiserfs_jh *jh;
734
735 jh = bh->b_private;
736 if (jh) {
737 bh->b_private = NULL;
738 jh->bh = NULL;
739 list_del_init(&jh->list);
740 kfree(jh);
741 if (atomic_read(&nr_reiserfs_jh) <= 0)
742 BUG();
743 atomic_dec(&nr_reiserfs_jh);
744 put_bh(bh);
745 }
746}
747
748static inline int __add_jh(struct reiserfs_journal *j, struct buffer_head *bh,
749 int tail)
750{
751 struct reiserfs_jh *jh;
752
753 if (bh->b_private) {
754 spin_lock(&j->j_dirty_buffers_lock);
755 if (!bh->b_private) {
756 spin_unlock(&j->j_dirty_buffers_lock);
757 goto no_jh;
758 }
759 jh = bh->b_private;
760 list_del_init(&jh->list);
761 } else {
762 no_jh:
763 get_bh(bh);
764 jh = alloc_jh();
765 spin_lock(&j->j_dirty_buffers_lock);
766 /* buffer must be locked for __add_jh, should be able to have
767 * two adds at the same time
768 */
769 BUG_ON(bh->b_private);
770 jh->bh = bh;
771 bh->b_private = jh;
772 }
773 jh->jl = j->j_current_jl;
774 if (tail)
775 list_add_tail(&jh->list, &jh->jl->j_tail_bh_list);
776 else {
777 list_add_tail(&jh->list, &jh->jl->j_bh_list);
778 }
779 spin_unlock(&j->j_dirty_buffers_lock);
780 return 0;
781}
782
783int reiserfs_add_tail_list(struct inode *inode, struct buffer_head *bh)
784{
785 return __add_jh(SB_JOURNAL(inode->i_sb), bh, 1);
786}
787int reiserfs_add_ordered_list(struct inode *inode, struct buffer_head *bh)
788{
789 return __add_jh(SB_JOURNAL(inode->i_sb), bh, 0);
790}
791
792#define JH_ENTRY(l) list_entry((l), struct reiserfs_jh, list)
793static int write_ordered_buffers(spinlock_t * lock,
794 struct reiserfs_journal *j,
795 struct reiserfs_journal_list *jl,
796 struct list_head *list)
797{
798 struct buffer_head *bh;
799 struct reiserfs_jh *jh;
800 int ret = j->j_errno;
801 struct buffer_chunk chunk;
802 struct list_head tmp;
803 INIT_LIST_HEAD(&tmp);
804
805 chunk.nr = 0;
806 spin_lock(lock);
807 while (!list_empty(list)) {
808 jh = JH_ENTRY(list->next);
809 bh = jh->bh;
810 get_bh(bh);
811 if (!trylock_buffer(bh)) {
812 if (!buffer_dirty(bh)) {
813 list_move(&jh->list, &tmp);
814 goto loop_next;
815 }
816 spin_unlock(lock);
817 if (chunk.nr)
818 write_ordered_chunk(&chunk);
819 wait_on_buffer(bh);
820 cond_resched();
821 spin_lock(lock);
822 goto loop_next;
823 }
824 /* in theory, dirty non-uptodate buffers should never get here,
825 * but the upper layer io error paths still have a few quirks.
826 * Handle them here as gracefully as we can
827 */
828 if (!buffer_uptodate(bh) && buffer_dirty(bh)) {
829 clear_buffer_dirty(bh);
830 ret = -EIO;
831 }
832 if (buffer_dirty(bh)) {
833 list_move(&jh->list, &tmp);
834 add_to_chunk(&chunk, bh, lock, write_ordered_chunk);
835 } else {
836 reiserfs_free_jh(bh);
837 unlock_buffer(bh);
838 }
839 loop_next:
840 put_bh(bh);
841 cond_resched_lock(lock);
842 }
843 if (chunk.nr) {
844 spin_unlock(lock);
845 write_ordered_chunk(&chunk);
846 spin_lock(lock);
847 }
848 while (!list_empty(&tmp)) {
849 jh = JH_ENTRY(tmp.prev);
850 bh = jh->bh;
851 get_bh(bh);
852 reiserfs_free_jh(bh);
853
854 if (buffer_locked(bh)) {
855 spin_unlock(lock);
856 wait_on_buffer(bh);
857 spin_lock(lock);
858 }
859 if (!buffer_uptodate(bh)) {
860 ret = -EIO;
861 }
862 /* ugly interaction with invalidatepage here.
863 * reiserfs_invalidate_page will pin any buffer that has a valid
864 * journal head from an older transaction. If someone else sets
865 * our buffer dirty after we write it in the first loop, and
866 * then someone truncates the page away, nobody will ever write
867 * the buffer. We're safe if we write the page one last time
868 * after freeing the journal header.
869 */
870 if (buffer_dirty(bh) && unlikely(bh->b_page->mapping == NULL)) {
871 spin_unlock(lock);
872 ll_rw_block(WRITE, 1, &bh);
873 spin_lock(lock);
874 }
875 put_bh(bh);
876 cond_resched_lock(lock);
877 }
878 spin_unlock(lock);
879 return ret;
880}
881
882static int flush_older_commits(struct super_block *s,
883 struct reiserfs_journal_list *jl)
884{
885 struct reiserfs_journal *journal = SB_JOURNAL(s);
886 struct reiserfs_journal_list *other_jl;
887 struct reiserfs_journal_list *first_jl;
888 struct list_head *entry;
889 unsigned int trans_id = jl->j_trans_id;
890 unsigned int other_trans_id;
891 unsigned int first_trans_id;
892
893 find_first:
894 /*
895 * first we walk backwards to find the oldest uncommitted transation
896 */
897 first_jl = jl;
898 entry = jl->j_list.prev;
899 while (1) {
900 other_jl = JOURNAL_LIST_ENTRY(entry);
901 if (entry == &journal->j_journal_list ||
902 atomic_read(&other_jl->j_older_commits_done))
903 break;
904
905 first_jl = other_jl;
906 entry = other_jl->j_list.prev;
907 }
908
909 /* if we didn't find any older uncommitted transactions, return now */
910 if (first_jl == jl) {
911 return 0;
912 }
913
914 first_trans_id = first_jl->j_trans_id;
915
916 entry = &first_jl->j_list;
917 while (1) {
918 other_jl = JOURNAL_LIST_ENTRY(entry);
919 other_trans_id = other_jl->j_trans_id;
920
921 if (other_trans_id < trans_id) {
922 if (atomic_read(&other_jl->j_commit_left) != 0) {
923 flush_commit_list(s, other_jl, 0);
924
925 /* list we were called with is gone, return */
926 if (!journal_list_still_alive(s, trans_id))
927 return 1;
928
929 /* the one we just flushed is gone, this means all
930 * older lists are also gone, so first_jl is no longer
931 * valid either. Go back to the beginning.
932 */
933 if (!journal_list_still_alive
934 (s, other_trans_id)) {
935 goto find_first;
936 }
937 }
938 entry = entry->next;
939 if (entry == &journal->j_journal_list)
940 return 0;
941 } else {
942 return 0;
943 }
944 }
945 return 0;
946}
947
948static int reiserfs_async_progress_wait(struct super_block *s)
949{
950 struct reiserfs_journal *j = SB_JOURNAL(s);
951
952 if (atomic_read(&j->j_async_throttle)) {
953 reiserfs_write_unlock(s);
954 congestion_wait(BLK_RW_ASYNC, HZ / 10);
955 reiserfs_write_lock(s);
956 }
957
958 return 0;
959}
960
961/*
962** if this journal list still has commit blocks unflushed, send them to disk.
963**
964** log areas must be flushed in order (transaction 2 can't commit before transaction 1)
965** Before the commit block can by written, every other log block must be safely on disk
966**
967*/
968static int flush_commit_list(struct super_block *s,
969 struct reiserfs_journal_list *jl, int flushall)
970{
971 int i;
972 b_blocknr_t bn;
973 struct buffer_head *tbh = NULL;
974 unsigned int trans_id = jl->j_trans_id;
975 struct reiserfs_journal *journal = SB_JOURNAL(s);
976 int retval = 0;
977 int write_len;
978
979 reiserfs_check_lock_depth(s, "flush_commit_list");
980
981 if (atomic_read(&jl->j_older_commits_done)) {
982 return 0;
983 }
984
985 /* before we can put our commit blocks on disk, we have to make sure everyone older than
986 ** us is on disk too
987 */
988 BUG_ON(jl->j_len <= 0);
989 BUG_ON(trans_id == journal->j_trans_id);
990
991 get_journal_list(jl);
992 if (flushall) {
993 if (flush_older_commits(s, jl) == 1) {
994 /* list disappeared during flush_older_commits. return */
995 goto put_jl;
996 }
997 }
998
999 /* make sure nobody is trying to flush this one at the same time */
1000 reiserfs_mutex_lock_safe(&jl->j_commit_mutex, s);
1001
1002 if (!journal_list_still_alive(s, trans_id)) {
1003 mutex_unlock(&jl->j_commit_mutex);
1004 goto put_jl;
1005 }
1006 BUG_ON(jl->j_trans_id == 0);
1007
1008 /* this commit is done, exit */
1009 if (atomic_read(&(jl->j_commit_left)) <= 0) {
1010 if (flushall) {
1011 atomic_set(&(jl->j_older_commits_done), 1);
1012 }
1013 mutex_unlock(&jl->j_commit_mutex);
1014 goto put_jl;
1015 }
1016
1017 if (!list_empty(&jl->j_bh_list)) {
1018 int ret;
1019
1020 /*
1021 * We might sleep in numerous places inside
1022 * write_ordered_buffers. Relax the write lock.
1023 */
1024 reiserfs_write_unlock(s);
1025 ret = write_ordered_buffers(&journal->j_dirty_buffers_lock,
1026 journal, jl, &jl->j_bh_list);
1027 if (ret < 0 && retval == 0)
1028 retval = ret;
1029 reiserfs_write_lock(s);
1030 }
1031 BUG_ON(!list_empty(&jl->j_bh_list));
1032 /*
1033 * for the description block and all the log blocks, submit any buffers
1034 * that haven't already reached the disk. Try to write at least 256
1035 * log blocks. later on, we will only wait on blocks that correspond
1036 * to this transaction, but while we're unplugging we might as well
1037 * get a chunk of data on there.
1038 */
1039 atomic_inc(&journal->j_async_throttle);
1040 write_len = jl->j_len + 1;
1041 if (write_len < 256)
1042 write_len = 256;
1043 for (i = 0 ; i < write_len ; i++) {
1044 bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) + (jl->j_start + i) %
1045 SB_ONDISK_JOURNAL_SIZE(s);
1046 tbh = journal_find_get_block(s, bn);
1047 if (tbh) {
1048 if (buffer_dirty(tbh)) {
1049 reiserfs_write_unlock(s);
1050 ll_rw_block(WRITE, 1, &tbh);
1051 reiserfs_write_lock(s);
1052 }
1053 put_bh(tbh) ;
1054 }
1055 }
1056 atomic_dec(&journal->j_async_throttle);
1057
1058 for (i = 0; i < (jl->j_len + 1); i++) {
1059 bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) +
1060 (jl->j_start + i) % SB_ONDISK_JOURNAL_SIZE(s);
1061 tbh = journal_find_get_block(s, bn);
1062
1063 reiserfs_write_unlock(s);
1064 wait_on_buffer(tbh);
1065 reiserfs_write_lock(s);
1066 // since we're using ll_rw_blk above, it might have skipped over
1067 // a locked buffer. Double check here
1068 //
1069 /* redundant, sync_dirty_buffer() checks */
1070 if (buffer_dirty(tbh)) {
1071 reiserfs_write_unlock(s);
1072 sync_dirty_buffer(tbh);
1073 reiserfs_write_lock(s);
1074 }
1075 if (unlikely(!buffer_uptodate(tbh))) {
1076#ifdef CONFIG_REISERFS_CHECK
1077 reiserfs_warning(s, "journal-601",
1078 "buffer write failed");
1079#endif
1080 retval = -EIO;
1081 }
1082 put_bh(tbh); /* once for journal_find_get_block */
1083 put_bh(tbh); /* once due to original getblk in do_journal_end */
1084 atomic_dec(&(jl->j_commit_left));
1085 }
1086
1087 BUG_ON(atomic_read(&(jl->j_commit_left)) != 1);
1088
1089 /* If there was a write error in the journal - we can't commit
1090 * this transaction - it will be invalid and, if successful,
1091 * will just end up propagating the write error out to
1092 * the file system. */
1093 if (likely(!retval && !reiserfs_is_journal_aborted (journal))) {
1094 if (buffer_dirty(jl->j_commit_bh))
1095 BUG();
1096 mark_buffer_dirty(jl->j_commit_bh) ;
1097 reiserfs_write_unlock(s);
1098 if (reiserfs_barrier_flush(s))
1099 __sync_dirty_buffer(jl->j_commit_bh, WRITE_FLUSH_FUA);
1100 else
1101 sync_dirty_buffer(jl->j_commit_bh);
1102 reiserfs_write_lock(s);
1103 }
1104
1105 /* If there was a write error in the journal - we can't commit this
1106 * transaction - it will be invalid and, if successful, will just end
1107 * up propagating the write error out to the filesystem. */
1108 if (unlikely(!buffer_uptodate(jl->j_commit_bh))) {
1109#ifdef CONFIG_REISERFS_CHECK
1110 reiserfs_warning(s, "journal-615", "buffer write failed");
1111#endif
1112 retval = -EIO;
1113 }
1114 bforget(jl->j_commit_bh);
1115 if (journal->j_last_commit_id != 0 &&
1116 (jl->j_trans_id - journal->j_last_commit_id) != 1) {
1117 reiserfs_warning(s, "clm-2200", "last commit %lu, current %lu",
1118 journal->j_last_commit_id, jl->j_trans_id);
1119 }
1120 journal->j_last_commit_id = jl->j_trans_id;
1121
1122 /* now, every commit block is on the disk. It is safe to allow blocks freed during this transaction to be reallocated */
1123 cleanup_freed_for_journal_list(s, jl);
1124
1125 retval = retval ? retval : journal->j_errno;
1126
1127 /* mark the metadata dirty */
1128 if (!retval)
1129 dirty_one_transaction(s, jl);
1130 atomic_dec(&(jl->j_commit_left));
1131
1132 if (flushall) {
1133 atomic_set(&(jl->j_older_commits_done), 1);
1134 }
1135 mutex_unlock(&jl->j_commit_mutex);
1136 put_jl:
1137 put_journal_list(s, jl);
1138
1139 if (retval)
1140 reiserfs_abort(s, retval, "Journal write error in %s",
1141 __func__);
1142 return retval;
1143}
1144
1145/*
1146** flush_journal_list frequently needs to find a newer transaction for a given block. This does that, or
1147** returns NULL if it can't find anything
1148*/
1149static struct reiserfs_journal_list *find_newer_jl_for_cn(struct
1150 reiserfs_journal_cnode
1151 *cn)
1152{
1153 struct super_block *sb = cn->sb;
1154 b_blocknr_t blocknr = cn->blocknr;
1155
1156 cn = cn->hprev;
1157 while (cn) {
1158 if (cn->sb == sb && cn->blocknr == blocknr && cn->jlist) {
1159 return cn->jlist;
1160 }
1161 cn = cn->hprev;
1162 }
1163 return NULL;
1164}
1165
1166static int newer_jl_done(struct reiserfs_journal_cnode *cn)
1167{
1168 struct super_block *sb = cn->sb;
1169 b_blocknr_t blocknr = cn->blocknr;
1170
1171 cn = cn->hprev;
1172 while (cn) {
1173 if (cn->sb == sb && cn->blocknr == blocknr && cn->jlist &&
1174 atomic_read(&cn->jlist->j_commit_left) != 0)
1175 return 0;
1176 cn = cn->hprev;
1177 }
1178 return 1;
1179}
1180
1181static void remove_journal_hash(struct super_block *,
1182 struct reiserfs_journal_cnode **,
1183 struct reiserfs_journal_list *, unsigned long,
1184 int);
1185
1186/*
1187** once all the real blocks have been flushed, it is safe to remove them from the
1188** journal list for this transaction. Aside from freeing the cnode, this also allows the
1189** block to be reallocated for data blocks if it had been deleted.
1190*/
1191static void remove_all_from_journal_list(struct super_block *sb,
1192 struct reiserfs_journal_list *jl,
1193 int debug)
1194{
1195 struct reiserfs_journal *journal = SB_JOURNAL(sb);
1196 struct reiserfs_journal_cnode *cn, *last;
1197 cn = jl->j_realblock;
1198
1199 /* which is better, to lock once around the whole loop, or
1200 ** to lock for each call to remove_journal_hash?
1201 */
1202 while (cn) {
1203 if (cn->blocknr != 0) {
1204 if (debug) {
1205 reiserfs_warning(sb, "reiserfs-2201",
1206 "block %u, bh is %d, state %ld",
1207 cn->blocknr, cn->bh ? 1 : 0,
1208 cn->state);
1209 }
1210 cn->state = 0;
1211 remove_journal_hash(sb, journal->j_list_hash_table,
1212 jl, cn->blocknr, 1);
1213 }
1214 last = cn;
1215 cn = cn->next;
1216 free_cnode(sb, last);
1217 }
1218 jl->j_realblock = NULL;
1219}
1220
1221/*
1222** if this timestamp is greater than the timestamp we wrote last to the header block, write it to the header block.
1223** once this is done, I can safely say the log area for this transaction won't ever be replayed, and I can start
1224** releasing blocks in this transaction for reuse as data blocks.
1225** called by flush_journal_list, before it calls remove_all_from_journal_list
1226**
1227*/
1228static int _update_journal_header_block(struct super_block *sb,
1229 unsigned long offset,
1230 unsigned int trans_id)
1231{
1232 struct reiserfs_journal_header *jh;
1233 struct reiserfs_journal *journal = SB_JOURNAL(sb);
1234
1235 if (reiserfs_is_journal_aborted(journal))
1236 return -EIO;
1237
1238 if (trans_id >= journal->j_last_flush_trans_id) {
1239 if (buffer_locked((journal->j_header_bh))) {
1240 reiserfs_write_unlock(sb);
1241 wait_on_buffer((journal->j_header_bh));
1242 reiserfs_write_lock(sb);
1243 if (unlikely(!buffer_uptodate(journal->j_header_bh))) {
1244#ifdef CONFIG_REISERFS_CHECK
1245 reiserfs_warning(sb, "journal-699",
1246 "buffer write failed");
1247#endif
1248 return -EIO;
1249 }
1250 }
1251 journal->j_last_flush_trans_id = trans_id;
1252 journal->j_first_unflushed_offset = offset;
1253 jh = (struct reiserfs_journal_header *)(journal->j_header_bh->
1254 b_data);
1255 jh->j_last_flush_trans_id = cpu_to_le32(trans_id);
1256 jh->j_first_unflushed_offset = cpu_to_le32(offset);
1257 jh->j_mount_id = cpu_to_le32(journal->j_mount_id);
1258
1259 set_buffer_dirty(journal->j_header_bh);
1260 reiserfs_write_unlock(sb);
1261
1262 if (reiserfs_barrier_flush(sb))
1263 __sync_dirty_buffer(journal->j_header_bh, WRITE_FLUSH_FUA);
1264 else
1265 sync_dirty_buffer(journal->j_header_bh);
1266
1267 reiserfs_write_lock(sb);
1268 if (!buffer_uptodate(journal->j_header_bh)) {
1269 reiserfs_warning(sb, "journal-837",
1270 "IO error during journal replay");
1271 return -EIO;
1272 }
1273 }
1274 return 0;
1275}
1276
1277static int update_journal_header_block(struct super_block *sb,
1278 unsigned long offset,
1279 unsigned int trans_id)
1280{
1281 return _update_journal_header_block(sb, offset, trans_id);
1282}
1283
1284/*
1285** flush any and all journal lists older than you are
1286** can only be called from flush_journal_list
1287*/
1288static int flush_older_journal_lists(struct super_block *sb,
1289 struct reiserfs_journal_list *jl)
1290{
1291 struct list_head *entry;
1292 struct reiserfs_journal_list *other_jl;
1293 struct reiserfs_journal *journal = SB_JOURNAL(sb);
1294 unsigned int trans_id = jl->j_trans_id;
1295
1296 /* we know we are the only ones flushing things, no extra race
1297 * protection is required.
1298 */
1299 restart:
1300 entry = journal->j_journal_list.next;
1301 /* Did we wrap? */
1302 if (entry == &journal->j_journal_list)
1303 return 0;
1304 other_jl = JOURNAL_LIST_ENTRY(entry);
1305 if (other_jl->j_trans_id < trans_id) {
1306 BUG_ON(other_jl->j_refcount <= 0);
1307 /* do not flush all */
1308 flush_journal_list(sb, other_jl, 0);
1309
1310 /* other_jl is now deleted from the list */
1311 goto restart;
1312 }
1313 return 0;
1314}
1315
1316static void del_from_work_list(struct super_block *s,
1317 struct reiserfs_journal_list *jl)
1318{
1319 struct reiserfs_journal *journal = SB_JOURNAL(s);
1320 if (!list_empty(&jl->j_working_list)) {
1321 list_del_init(&jl->j_working_list);
1322 journal->j_num_work_lists--;
1323 }
1324}
1325
1326/* flush a journal list, both commit and real blocks
1327**
1328** always set flushall to 1, unless you are calling from inside
1329** flush_journal_list
1330**
1331** IMPORTANT. This can only be called while there are no journal writers,
1332** and the journal is locked. That means it can only be called from
1333** do_journal_end, or by journal_release
1334*/
1335static int flush_journal_list(struct super_block *s,
1336 struct reiserfs_journal_list *jl, int flushall)
1337{
1338 struct reiserfs_journal_list *pjl;
1339 struct reiserfs_journal_cnode *cn, *last;
1340 int count;
1341 int was_jwait = 0;
1342 int was_dirty = 0;
1343 struct buffer_head *saved_bh;
1344 unsigned long j_len_saved = jl->j_len;
1345 struct reiserfs_journal *journal = SB_JOURNAL(s);
1346 int err = 0;
1347
1348 BUG_ON(j_len_saved <= 0);
1349
1350 if (atomic_read(&journal->j_wcount) != 0) {
1351 reiserfs_warning(s, "clm-2048", "called with wcount %d",
1352 atomic_read(&journal->j_wcount));
1353 }
1354 BUG_ON(jl->j_trans_id == 0);
1355
1356 /* if flushall == 0, the lock is already held */
1357 if (flushall) {
1358 reiserfs_mutex_lock_safe(&journal->j_flush_mutex, s);
1359 } else if (mutex_trylock(&journal->j_flush_mutex)) {
1360 BUG();
1361 }
1362
1363 count = 0;
1364 if (j_len_saved > journal->j_trans_max) {
1365 reiserfs_panic(s, "journal-715", "length is %lu, trans id %lu",
1366 j_len_saved, jl->j_trans_id);
1367 return 0;
1368 }
1369
1370 /* if all the work is already done, get out of here */
1371 if (atomic_read(&(jl->j_nonzerolen)) <= 0 &&
1372 atomic_read(&(jl->j_commit_left)) <= 0) {
1373 goto flush_older_and_return;
1374 }
1375
1376 /* start by putting the commit list on disk. This will also flush
1377 ** the commit lists of any olders transactions
1378 */
1379 flush_commit_list(s, jl, 1);
1380
1381 if (!(jl->j_state & LIST_DIRTY)
1382 && !reiserfs_is_journal_aborted(journal))
1383 BUG();
1384
1385 /* are we done now? */
1386 if (atomic_read(&(jl->j_nonzerolen)) <= 0 &&
1387 atomic_read(&(jl->j_commit_left)) <= 0) {
1388 goto flush_older_and_return;
1389 }
1390
1391 /* loop through each cnode, see if we need to write it,
1392 ** or wait on a more recent transaction, or just ignore it
1393 */
1394 if (atomic_read(&(journal->j_wcount)) != 0) {
1395 reiserfs_panic(s, "journal-844", "journal list is flushing, "
1396 "wcount is not 0");
1397 }
1398 cn = jl->j_realblock;
1399 while (cn) {
1400 was_jwait = 0;
1401 was_dirty = 0;
1402 saved_bh = NULL;
1403 /* blocknr of 0 is no longer in the hash, ignore it */
1404 if (cn->blocknr == 0) {
1405 goto free_cnode;
1406 }
1407
1408 /* This transaction failed commit. Don't write out to the disk */
1409 if (!(jl->j_state & LIST_DIRTY))
1410 goto free_cnode;
1411
1412 pjl = find_newer_jl_for_cn(cn);
1413 /* the order is important here. We check pjl to make sure we
1414 ** don't clear BH_JDirty_wait if we aren't the one writing this
1415 ** block to disk
1416 */
1417 if (!pjl && cn->bh) {
1418 saved_bh = cn->bh;
1419
1420 /* we do this to make sure nobody releases the buffer while
1421 ** we are working with it
1422 */
1423 get_bh(saved_bh);
1424
1425 if (buffer_journal_dirty(saved_bh)) {
1426 BUG_ON(!can_dirty(cn));
1427 was_jwait = 1;
1428 was_dirty = 1;
1429 } else if (can_dirty(cn)) {
1430 /* everything with !pjl && jwait should be writable */
1431 BUG();
1432 }
1433 }
1434
1435 /* if someone has this block in a newer transaction, just make
1436 ** sure they are committed, and don't try writing it to disk
1437 */
1438 if (pjl) {
1439 if (atomic_read(&pjl->j_commit_left))
1440 flush_commit_list(s, pjl, 1);
1441 goto free_cnode;
1442 }
1443
1444 /* bh == NULL when the block got to disk on its own, OR,
1445 ** the block got freed in a future transaction
1446 */
1447 if (saved_bh == NULL) {
1448 goto free_cnode;
1449 }
1450
1451 /* this should never happen. kupdate_one_transaction has this list
1452 ** locked while it works, so we should never see a buffer here that
1453 ** is not marked JDirty_wait
1454 */
1455 if ((!was_jwait) && !buffer_locked(saved_bh)) {
1456 reiserfs_warning(s, "journal-813",
1457 "BAD! buffer %llu %cdirty %cjwait, "
1458 "not in a newer tranasction",
1459 (unsigned long long)saved_bh->
1460 b_blocknr, was_dirty ? ' ' : '!',
1461 was_jwait ? ' ' : '!');
1462 }
1463 if (was_dirty) {
1464 /* we inc again because saved_bh gets decremented at free_cnode */
1465 get_bh(saved_bh);
1466 set_bit(BLOCK_NEEDS_FLUSH, &cn->state);
1467 lock_buffer(saved_bh);
1468 BUG_ON(cn->blocknr != saved_bh->b_blocknr);
1469 if (buffer_dirty(saved_bh))
1470 submit_logged_buffer(saved_bh);
1471 else
1472 unlock_buffer(saved_bh);
1473 count++;
1474 } else {
1475 reiserfs_warning(s, "clm-2082",
1476 "Unable to flush buffer %llu in %s",
1477 (unsigned long long)saved_bh->
1478 b_blocknr, __func__);
1479 }
1480 free_cnode:
1481 last = cn;
1482 cn = cn->next;
1483 if (saved_bh) {
1484 /* we incremented this to keep others from taking the buffer head away */
1485 put_bh(saved_bh);
1486 if (atomic_read(&(saved_bh->b_count)) < 0) {
1487 reiserfs_warning(s, "journal-945",
1488 "saved_bh->b_count < 0");
1489 }
1490 }
1491 }
1492 if (count > 0) {
1493 cn = jl->j_realblock;
1494 while (cn) {
1495 if (test_bit(BLOCK_NEEDS_FLUSH, &cn->state)) {
1496 if (!cn->bh) {
1497 reiserfs_panic(s, "journal-1011",
1498 "cn->bh is NULL");
1499 }
1500
1501 reiserfs_write_unlock(s);
1502 wait_on_buffer(cn->bh);
1503 reiserfs_write_lock(s);
1504
1505 if (!cn->bh) {
1506 reiserfs_panic(s, "journal-1012",
1507 "cn->bh is NULL");
1508 }
1509 if (unlikely(!buffer_uptodate(cn->bh))) {
1510#ifdef CONFIG_REISERFS_CHECK
1511 reiserfs_warning(s, "journal-949",
1512 "buffer write failed");
1513#endif
1514 err = -EIO;
1515 }
1516 /* note, we must clear the JDirty_wait bit after the up to date
1517 ** check, otherwise we race against our flushpage routine
1518 */
1519 BUG_ON(!test_clear_buffer_journal_dirty
1520 (cn->bh));
1521
1522 /* drop one ref for us */
1523 put_bh(cn->bh);
1524 /* drop one ref for journal_mark_dirty */
1525 release_buffer_page(cn->bh);
1526 }
1527 cn = cn->next;
1528 }
1529 }
1530
1531 if (err)
1532 reiserfs_abort(s, -EIO,
1533 "Write error while pushing transaction to disk in %s",
1534 __func__);
1535 flush_older_and_return:
1536
1537 /* before we can update the journal header block, we _must_ flush all
1538 ** real blocks from all older transactions to disk. This is because
1539 ** once the header block is updated, this transaction will not be
1540 ** replayed after a crash
1541 */
1542 if (flushall) {
1543 flush_older_journal_lists(s, jl);
1544 }
1545
1546 err = journal->j_errno;
1547 /* before we can remove everything from the hash tables for this
1548 ** transaction, we must make sure it can never be replayed
1549 **
1550 ** since we are only called from do_journal_end, we know for sure there
1551 ** are no allocations going on while we are flushing journal lists. So,
1552 ** we only need to update the journal header block for the last list
1553 ** being flushed
1554 */
1555 if (!err && flushall) {
1556 err =
1557 update_journal_header_block(s,
1558 (jl->j_start + jl->j_len +
1559 2) % SB_ONDISK_JOURNAL_SIZE(s),
1560 jl->j_trans_id);
1561 if (err)
1562 reiserfs_abort(s, -EIO,
1563 "Write error while updating journal header in %s",
1564 __func__);
1565 }
1566 remove_all_from_journal_list(s, jl, 0);
1567 list_del_init(&jl->j_list);
1568 journal->j_num_lists--;
1569 del_from_work_list(s, jl);
1570
1571 if (journal->j_last_flush_id != 0 &&
1572 (jl->j_trans_id - journal->j_last_flush_id) != 1) {
1573 reiserfs_warning(s, "clm-2201", "last flush %lu, current %lu",
1574 journal->j_last_flush_id, jl->j_trans_id);
1575 }
1576 journal->j_last_flush_id = jl->j_trans_id;
1577
1578 /* not strictly required since we are freeing the list, but it should
1579 * help find code using dead lists later on
1580 */
1581 jl->j_len = 0;
1582 atomic_set(&(jl->j_nonzerolen), 0);
1583 jl->j_start = 0;
1584 jl->j_realblock = NULL;
1585 jl->j_commit_bh = NULL;
1586 jl->j_trans_id = 0;
1587 jl->j_state = 0;
1588 put_journal_list(s, jl);
1589 if (flushall)
1590 mutex_unlock(&journal->j_flush_mutex);
1591 return err;
1592}
1593
1594static int test_transaction(struct super_block *s,
1595 struct reiserfs_journal_list *jl)
1596{
1597 struct reiserfs_journal_cnode *cn;
1598
1599 if (jl->j_len == 0 || atomic_read(&jl->j_nonzerolen) == 0)
1600 return 1;
1601
1602 cn = jl->j_realblock;
1603 while (cn) {
1604 /* if the blocknr == 0, this has been cleared from the hash,
1605 ** skip it
1606 */
1607 if (cn->blocknr == 0) {
1608 goto next;
1609 }
1610 if (cn->bh && !newer_jl_done(cn))
1611 return 0;
1612 next:
1613 cn = cn->next;
1614 cond_resched();
1615 }
1616 return 0;
1617}
1618
1619static int write_one_transaction(struct super_block *s,
1620 struct reiserfs_journal_list *jl,
1621 struct buffer_chunk *chunk)
1622{
1623 struct reiserfs_journal_cnode *cn;
1624 int ret = 0;
1625
1626 jl->j_state |= LIST_TOUCHED;
1627 del_from_work_list(s, jl);
1628 if (jl->j_len == 0 || atomic_read(&jl->j_nonzerolen) == 0) {
1629 return 0;
1630 }
1631
1632 cn = jl->j_realblock;
1633 while (cn) {
1634 /* if the blocknr == 0, this has been cleared from the hash,
1635 ** skip it
1636 */
1637 if (cn->blocknr == 0) {
1638 goto next;
1639 }
1640 if (cn->bh && can_dirty(cn) && buffer_dirty(cn->bh)) {
1641 struct buffer_head *tmp_bh;
1642 /* we can race against journal_mark_freed when we try
1643 * to lock_buffer(cn->bh), so we have to inc the buffer
1644 * count, and recheck things after locking
1645 */
1646 tmp_bh = cn->bh;
1647 get_bh(tmp_bh);
1648 lock_buffer(tmp_bh);
1649 if (cn->bh && can_dirty(cn) && buffer_dirty(tmp_bh)) {
1650 if (!buffer_journal_dirty(tmp_bh) ||
1651 buffer_journal_prepared(tmp_bh))
1652 BUG();
1653 add_to_chunk(chunk, tmp_bh, NULL, write_chunk);
1654 ret++;
1655 } else {
1656 /* note, cn->bh might be null now */
1657 unlock_buffer(tmp_bh);
1658 }
1659 put_bh(tmp_bh);
1660 }
1661 next:
1662 cn = cn->next;
1663 cond_resched();
1664 }
1665 return ret;
1666}
1667
1668/* used by flush_commit_list */
1669static int dirty_one_transaction(struct super_block *s,
1670 struct reiserfs_journal_list *jl)
1671{
1672 struct reiserfs_journal_cnode *cn;
1673 struct reiserfs_journal_list *pjl;
1674 int ret = 0;
1675
1676 jl->j_state |= LIST_DIRTY;
1677 cn = jl->j_realblock;
1678 while (cn) {
1679 /* look for a more recent transaction that logged this
1680 ** buffer. Only the most recent transaction with a buffer in
1681 ** it is allowed to send that buffer to disk
1682 */
1683 pjl = find_newer_jl_for_cn(cn);
1684 if (!pjl && cn->blocknr && cn->bh
1685 && buffer_journal_dirty(cn->bh)) {
1686 BUG_ON(!can_dirty(cn));
1687 /* if the buffer is prepared, it will either be logged
1688 * or restored. If restored, we need to make sure
1689 * it actually gets marked dirty
1690 */
1691 clear_buffer_journal_new(cn->bh);
1692 if (buffer_journal_prepared(cn->bh)) {
1693 set_buffer_journal_restore_dirty(cn->bh);
1694 } else {
1695 set_buffer_journal_test(cn->bh);
1696 mark_buffer_dirty(cn->bh);
1697 }
1698 }
1699 cn = cn->next;
1700 }
1701 return ret;
1702}
1703
1704static int kupdate_transactions(struct super_block *s,
1705 struct reiserfs_journal_list *jl,
1706 struct reiserfs_journal_list **next_jl,
1707 unsigned int *next_trans_id,
1708 int num_blocks, int num_trans)
1709{
1710 int ret = 0;
1711 int written = 0;
1712 int transactions_flushed = 0;
1713 unsigned int orig_trans_id = jl->j_trans_id;
1714 struct buffer_chunk chunk;
1715 struct list_head *entry;
1716 struct reiserfs_journal *journal = SB_JOURNAL(s);
1717 chunk.nr = 0;
1718
1719 reiserfs_mutex_lock_safe(&journal->j_flush_mutex, s);
1720 if (!journal_list_still_alive(s, orig_trans_id)) {
1721 goto done;
1722 }
1723
1724 /* we've got j_flush_mutex held, nobody is going to delete any
1725 * of these lists out from underneath us
1726 */
1727 while ((num_trans && transactions_flushed < num_trans) ||
1728 (!num_trans && written < num_blocks)) {
1729
1730 if (jl->j_len == 0 || (jl->j_state & LIST_TOUCHED) ||
1731 atomic_read(&jl->j_commit_left)
1732 || !(jl->j_state & LIST_DIRTY)) {
1733 del_from_work_list(s, jl);
1734 break;
1735 }
1736 ret = write_one_transaction(s, jl, &chunk);
1737
1738 if (ret < 0)
1739 goto done;
1740 transactions_flushed++;
1741 written += ret;
1742 entry = jl->j_list.next;
1743
1744 /* did we wrap? */
1745 if (entry == &journal->j_journal_list) {
1746 break;
1747 }
1748 jl = JOURNAL_LIST_ENTRY(entry);
1749
1750 /* don't bother with older transactions */
1751 if (jl->j_trans_id <= orig_trans_id)
1752 break;
1753 }
1754 if (chunk.nr) {
1755 write_chunk(&chunk);
1756 }
1757
1758 done:
1759 mutex_unlock(&journal->j_flush_mutex);
1760 return ret;
1761}
1762
1763/* for o_sync and fsync heavy applications, they tend to use
1764** all the journa list slots with tiny transactions. These
1765** trigger lots and lots of calls to update the header block, which
1766** adds seeks and slows things down.
1767**
1768** This function tries to clear out a large chunk of the journal lists
1769** at once, which makes everything faster since only the newest journal
1770** list updates the header block
1771*/
1772static int flush_used_journal_lists(struct super_block *s,
1773 struct reiserfs_journal_list *jl)
1774{
1775 unsigned long len = 0;
1776 unsigned long cur_len;
1777 int ret;
1778 int i;
1779 int limit = 256;
1780 struct reiserfs_journal_list *tjl;
1781 struct reiserfs_journal_list *flush_jl;
1782 unsigned int trans_id;
1783 struct reiserfs_journal *journal = SB_JOURNAL(s);
1784
1785 flush_jl = tjl = jl;
1786
1787 /* in data logging mode, try harder to flush a lot of blocks */
1788 if (reiserfs_data_log(s))
1789 limit = 1024;
1790 /* flush for 256 transactions or limit blocks, whichever comes first */
1791 for (i = 0; i < 256 && len < limit; i++) {
1792 if (atomic_read(&tjl->j_commit_left) ||
1793 tjl->j_trans_id < jl->j_trans_id) {
1794 break;
1795 }
1796 cur_len = atomic_read(&tjl->j_nonzerolen);
1797 if (cur_len > 0) {
1798 tjl->j_state &= ~LIST_TOUCHED;
1799 }
1800 len += cur_len;
1801 flush_jl = tjl;
1802 if (tjl->j_list.next == &journal->j_journal_list)
1803 break;
1804 tjl = JOURNAL_LIST_ENTRY(tjl->j_list.next);
1805 }
1806 /* try to find a group of blocks we can flush across all the
1807 ** transactions, but only bother if we've actually spanned
1808 ** across multiple lists
1809 */
1810 if (flush_jl != jl) {
1811 ret = kupdate_transactions(s, jl, &tjl, &trans_id, len, i);
1812 }
1813 flush_journal_list(s, flush_jl, 1);
1814 return 0;
1815}
1816
1817/*
1818** removes any nodes in table with name block and dev as bh.
1819** only touchs the hnext and hprev pointers.
1820*/
1821void remove_journal_hash(struct super_block *sb,
1822 struct reiserfs_journal_cnode **table,
1823 struct reiserfs_journal_list *jl,
1824 unsigned long block, int remove_freed)
1825{
1826 struct reiserfs_journal_cnode *cur;
1827 struct reiserfs_journal_cnode **head;
1828
1829 head = &(journal_hash(table, sb, block));
1830 if (!head) {
1831 return;
1832 }
1833 cur = *head;
1834 while (cur) {
1835 if (cur->blocknr == block && cur->sb == sb
1836 && (jl == NULL || jl == cur->jlist)
1837 && (!test_bit(BLOCK_FREED, &cur->state) || remove_freed)) {
1838 if (cur->hnext) {
1839 cur->hnext->hprev = cur->hprev;
1840 }
1841 if (cur->hprev) {
1842 cur->hprev->hnext = cur->hnext;
1843 } else {
1844 *head = cur->hnext;
1845 }
1846 cur->blocknr = 0;
1847 cur->sb = NULL;
1848 cur->state = 0;
1849 if (cur->bh && cur->jlist) /* anybody who clears the cur->bh will also dec the nonzerolen */
1850 atomic_dec(&(cur->jlist->j_nonzerolen));
1851 cur->bh = NULL;
1852 cur->jlist = NULL;
1853 }
1854 cur = cur->hnext;
1855 }
1856}
1857
1858static void free_journal_ram(struct super_block *sb)
1859{
1860 struct reiserfs_journal *journal = SB_JOURNAL(sb);
1861 kfree(journal->j_current_jl);
1862 journal->j_num_lists--;
1863
1864 vfree(journal->j_cnode_free_orig);
1865 free_list_bitmaps(sb, journal->j_list_bitmap);
1866 free_bitmap_nodes(sb); /* must be after free_list_bitmaps */
1867 if (journal->j_header_bh) {
1868 brelse(journal->j_header_bh);
1869 }
1870 /* j_header_bh is on the journal dev, make sure not to release the journal
1871 * dev until we brelse j_header_bh
1872 */
1873 release_journal_dev(sb, journal);
1874 vfree(journal);
1875}
1876
1877/*
1878** call on unmount. Only set error to 1 if you haven't made your way out
1879** of read_super() yet. Any other caller must keep error at 0.
1880*/
1881static int do_journal_release(struct reiserfs_transaction_handle *th,
1882 struct super_block *sb, int error)
1883{
1884 struct reiserfs_transaction_handle myth;
1885 int flushed = 0;
1886 struct reiserfs_journal *journal = SB_JOURNAL(sb);
1887
1888 /* we only want to flush out transactions if we were called with error == 0
1889 */
1890 if (!error && !(sb->s_flags & MS_RDONLY)) {
1891 /* end the current trans */
1892 BUG_ON(!th->t_trans_id);
1893 do_journal_end(th, sb, 10, FLUSH_ALL);
1894
1895 /* make sure something gets logged to force our way into the flush code */
1896 if (!journal_join(&myth, sb, 1)) {
1897 reiserfs_prepare_for_journal(sb,
1898 SB_BUFFER_WITH_SB(sb),
1899 1);
1900 journal_mark_dirty(&myth, sb,
1901 SB_BUFFER_WITH_SB(sb));
1902 do_journal_end(&myth, sb, 1, FLUSH_ALL);
1903 flushed = 1;
1904 }
1905 }
1906
1907 /* this also catches errors during the do_journal_end above */
1908 if (!error && reiserfs_is_journal_aborted(journal)) {
1909 memset(&myth, 0, sizeof(myth));
1910 if (!journal_join_abort(&myth, sb, 1)) {
1911 reiserfs_prepare_for_journal(sb,
1912 SB_BUFFER_WITH_SB(sb),
1913 1);
1914 journal_mark_dirty(&myth, sb,
1915 SB_BUFFER_WITH_SB(sb));
1916 do_journal_end(&myth, sb, 1, FLUSH_ALL);
1917 }
1918 }
1919
1920 reiserfs_mounted_fs_count--;
1921 /* wait for all commits to finish */
1922 cancel_delayed_work(&SB_JOURNAL(sb)->j_work);
1923
1924 /*
1925 * We must release the write lock here because
1926 * the workqueue job (flush_async_commit) needs this lock
1927 */
1928 reiserfs_write_unlock(sb);
1929 flush_workqueue(commit_wq);
1930
1931 if (!reiserfs_mounted_fs_count) {
1932 destroy_workqueue(commit_wq);
1933 commit_wq = NULL;
1934 }
1935
1936 free_journal_ram(sb);
1937
1938 reiserfs_write_lock(sb);
1939
1940 return 0;
1941}
1942
1943/*
1944** call on unmount. flush all journal trans, release all alloc'd ram
1945*/
1946int journal_release(struct reiserfs_transaction_handle *th,
1947 struct super_block *sb)
1948{
1949 return do_journal_release(th, sb, 0);
1950}
1951
1952/*
1953** only call from an error condition inside reiserfs_read_super!
1954*/
1955int journal_release_error(struct reiserfs_transaction_handle *th,
1956 struct super_block *sb)
1957{
1958 return do_journal_release(th, sb, 1);
1959}
1960
1961/* compares description block with commit block. returns 1 if they differ, 0 if they are the same */
1962static int journal_compare_desc_commit(struct super_block *sb,
1963 struct reiserfs_journal_desc *desc,
1964 struct reiserfs_journal_commit *commit)
1965{
1966 if (get_commit_trans_id(commit) != get_desc_trans_id(desc) ||
1967 get_commit_trans_len(commit) != get_desc_trans_len(desc) ||
1968 get_commit_trans_len(commit) > SB_JOURNAL(sb)->j_trans_max ||
1969 get_commit_trans_len(commit) <= 0) {
1970 return 1;
1971 }
1972 return 0;
1973}
1974
1975/* returns 0 if it did not find a description block
1976** returns -1 if it found a corrupt commit block
1977** returns 1 if both desc and commit were valid
1978*/
1979static int journal_transaction_is_valid(struct super_block *sb,
1980 struct buffer_head *d_bh,
1981 unsigned int *oldest_invalid_trans_id,
1982 unsigned long *newest_mount_id)
1983{
1984 struct reiserfs_journal_desc *desc;
1985 struct reiserfs_journal_commit *commit;
1986 struct buffer_head *c_bh;
1987 unsigned long offset;
1988
1989 if (!d_bh)
1990 return 0;
1991
1992 desc = (struct reiserfs_journal_desc *)d_bh->b_data;
1993 if (get_desc_trans_len(desc) > 0
1994 && !memcmp(get_journal_desc_magic(d_bh), JOURNAL_DESC_MAGIC, 8)) {
1995 if (oldest_invalid_trans_id && *oldest_invalid_trans_id
1996 && get_desc_trans_id(desc) > *oldest_invalid_trans_id) {
1997 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
1998 "journal-986: transaction "
1999 "is valid returning because trans_id %d is greater than "
2000 "oldest_invalid %lu",
2001 get_desc_trans_id(desc),
2002 *oldest_invalid_trans_id);
2003 return 0;
2004 }
2005 if (newest_mount_id
2006 && *newest_mount_id > get_desc_mount_id(desc)) {
2007 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2008 "journal-1087: transaction "
2009 "is valid returning because mount_id %d is less than "
2010 "newest_mount_id %lu",
2011 get_desc_mount_id(desc),
2012 *newest_mount_id);
2013 return -1;
2014 }
2015 if (get_desc_trans_len(desc) > SB_JOURNAL(sb)->j_trans_max) {
2016 reiserfs_warning(sb, "journal-2018",
2017 "Bad transaction length %d "
2018 "encountered, ignoring transaction",
2019 get_desc_trans_len(desc));
2020 return -1;
2021 }
2022 offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2023
2024 /* ok, we have a journal description block, lets see if the transaction was valid */
2025 c_bh =
2026 journal_bread(sb,
2027 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2028 ((offset + get_desc_trans_len(desc) +
2029 1) % SB_ONDISK_JOURNAL_SIZE(sb)));
2030 if (!c_bh)
2031 return 0;
2032 commit = (struct reiserfs_journal_commit *)c_bh->b_data;
2033 if (journal_compare_desc_commit(sb, desc, commit)) {
2034 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2035 "journal_transaction_is_valid, commit offset %ld had bad "
2036 "time %d or length %d",
2037 c_bh->b_blocknr -
2038 SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2039 get_commit_trans_id(commit),
2040 get_commit_trans_len(commit));
2041 brelse(c_bh);
2042 if (oldest_invalid_trans_id) {
2043 *oldest_invalid_trans_id =
2044 get_desc_trans_id(desc);
2045 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2046 "journal-1004: "
2047 "transaction_is_valid setting oldest invalid trans_id "
2048 "to %d",
2049 get_desc_trans_id(desc));
2050 }
2051 return -1;
2052 }
2053 brelse(c_bh);
2054 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2055 "journal-1006: found valid "
2056 "transaction start offset %llu, len %d id %d",
2057 d_bh->b_blocknr -
2058 SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2059 get_desc_trans_len(desc),
2060 get_desc_trans_id(desc));
2061 return 1;
2062 } else {
2063 return 0;
2064 }
2065}
2066
2067static void brelse_array(struct buffer_head **heads, int num)
2068{
2069 int i;
2070 for (i = 0; i < num; i++) {
2071 brelse(heads[i]);
2072 }
2073}
2074
2075/*
2076** given the start, and values for the oldest acceptable transactions,
2077** this either reads in a replays a transaction, or returns because the transaction
2078** is invalid, or too old.
2079*/
2080static int journal_read_transaction(struct super_block *sb,
2081 unsigned long cur_dblock,
2082 unsigned long oldest_start,
2083 unsigned int oldest_trans_id,
2084 unsigned long newest_mount_id)
2085{
2086 struct reiserfs_journal *journal = SB_JOURNAL(sb);
2087 struct reiserfs_journal_desc *desc;
2088 struct reiserfs_journal_commit *commit;
2089 unsigned int trans_id = 0;
2090 struct buffer_head *c_bh;
2091 struct buffer_head *d_bh;
2092 struct buffer_head **log_blocks = NULL;
2093 struct buffer_head **real_blocks = NULL;
2094 unsigned int trans_offset;
2095 int i;
2096 int trans_half;
2097
2098 d_bh = journal_bread(sb, cur_dblock);
2099 if (!d_bh)
2100 return 1;
2101 desc = (struct reiserfs_journal_desc *)d_bh->b_data;
2102 trans_offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2103 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1037: "
2104 "journal_read_transaction, offset %llu, len %d mount_id %d",
2105 d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2106 get_desc_trans_len(desc), get_desc_mount_id(desc));
2107 if (get_desc_trans_id(desc) < oldest_trans_id) {
2108 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1039: "
2109 "journal_read_trans skipping because %lu is too old",
2110 cur_dblock -
2111 SB_ONDISK_JOURNAL_1st_BLOCK(sb));
2112 brelse(d_bh);
2113 return 1;
2114 }
2115 if (get_desc_mount_id(desc) != newest_mount_id) {
2116 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1146: "
2117 "journal_read_trans skipping because %d is != "
2118 "newest_mount_id %lu", get_desc_mount_id(desc),
2119 newest_mount_id);
2120 brelse(d_bh);
2121 return 1;
2122 }
2123 c_bh = journal_bread(sb, SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2124 ((trans_offset + get_desc_trans_len(desc) + 1) %
2125 SB_ONDISK_JOURNAL_SIZE(sb)));
2126 if (!c_bh) {
2127 brelse(d_bh);
2128 return 1;
2129 }
2130 commit = (struct reiserfs_journal_commit *)c_bh->b_data;
2131 if (journal_compare_desc_commit(sb, desc, commit)) {
2132 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2133 "journal_read_transaction, "
2134 "commit offset %llu had bad time %d or length %d",
2135 c_bh->b_blocknr -
2136 SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2137 get_commit_trans_id(commit),
2138 get_commit_trans_len(commit));
2139 brelse(c_bh);
2140 brelse(d_bh);
2141 return 1;
2142 }
2143
2144 if (bdev_read_only(sb->s_bdev)) {
2145 reiserfs_warning(sb, "clm-2076",
2146 "device is readonly, unable to replay log");
2147 brelse(c_bh);
2148 brelse(d_bh);
2149 return -EROFS;
2150 }
2151
2152 trans_id = get_desc_trans_id(desc);
2153 /* now we know we've got a good transaction, and it was inside the valid time ranges */
2154 log_blocks = kmalloc(get_desc_trans_len(desc) *
2155 sizeof(struct buffer_head *), GFP_NOFS);
2156 real_blocks = kmalloc(get_desc_trans_len(desc) *
2157 sizeof(struct buffer_head *), GFP_NOFS);
2158 if (!log_blocks || !real_blocks) {
2159 brelse(c_bh);
2160 brelse(d_bh);
2161 kfree(log_blocks);
2162 kfree(real_blocks);
2163 reiserfs_warning(sb, "journal-1169",
2164 "kmalloc failed, unable to mount FS");
2165 return -1;
2166 }
2167 /* get all the buffer heads */
2168 trans_half = journal_trans_half(sb->s_blocksize);
2169 for (i = 0; i < get_desc_trans_len(desc); i++) {
2170 log_blocks[i] =
2171 journal_getblk(sb,
2172 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2173 (trans_offset + 1 +
2174 i) % SB_ONDISK_JOURNAL_SIZE(sb));
2175 if (i < trans_half) {
2176 real_blocks[i] =
2177 sb_getblk(sb,
2178 le32_to_cpu(desc->j_realblock[i]));
2179 } else {
2180 real_blocks[i] =
2181 sb_getblk(sb,
2182 le32_to_cpu(commit->
2183 j_realblock[i - trans_half]));
2184 }
2185 if (real_blocks[i]->b_blocknr > SB_BLOCK_COUNT(sb)) {
2186 reiserfs_warning(sb, "journal-1207",
2187 "REPLAY FAILURE fsck required! "
2188 "Block to replay is outside of "
2189 "filesystem");
2190 goto abort_replay;
2191 }
2192 /* make sure we don't try to replay onto log or reserved area */
2193 if (is_block_in_log_or_reserved_area
2194 (sb, real_blocks[i]->b_blocknr)) {
2195 reiserfs_warning(sb, "journal-1204",
2196 "REPLAY FAILURE fsck required! "
2197 "Trying to replay onto a log block");
2198 abort_replay:
2199 brelse_array(log_blocks, i);
2200 brelse_array(real_blocks, i);
2201 brelse(c_bh);
2202 brelse(d_bh);
2203 kfree(log_blocks);
2204 kfree(real_blocks);
2205 return -1;
2206 }
2207 }
2208 /* read in the log blocks, memcpy to the corresponding real block */
2209 ll_rw_block(READ, get_desc_trans_len(desc), log_blocks);
2210 for (i = 0; i < get_desc_trans_len(desc); i++) {
2211
2212 reiserfs_write_unlock(sb);
2213 wait_on_buffer(log_blocks[i]);
2214 reiserfs_write_lock(sb);
2215
2216 if (!buffer_uptodate(log_blocks[i])) {
2217 reiserfs_warning(sb, "journal-1212",
2218 "REPLAY FAILURE fsck required! "
2219 "buffer write failed");
2220 brelse_array(log_blocks + i,
2221 get_desc_trans_len(desc) - i);
2222 brelse_array(real_blocks, get_desc_trans_len(desc));
2223 brelse(c_bh);
2224 brelse(d_bh);
2225 kfree(log_blocks);
2226 kfree(real_blocks);
2227 return -1;
2228 }
2229 memcpy(real_blocks[i]->b_data, log_blocks[i]->b_data,
2230 real_blocks[i]->b_size);
2231 set_buffer_uptodate(real_blocks[i]);
2232 brelse(log_blocks[i]);
2233 }
2234 /* flush out the real blocks */
2235 for (i = 0; i < get_desc_trans_len(desc); i++) {
2236 set_buffer_dirty(real_blocks[i]);
2237 write_dirty_buffer(real_blocks[i], WRITE);
2238 }
2239 for (i = 0; i < get_desc_trans_len(desc); i++) {
2240 wait_on_buffer(real_blocks[i]);
2241 if (!buffer_uptodate(real_blocks[i])) {
2242 reiserfs_warning(sb, "journal-1226",
2243 "REPLAY FAILURE, fsck required! "
2244 "buffer write failed");
2245 brelse_array(real_blocks + i,
2246 get_desc_trans_len(desc) - i);
2247 brelse(c_bh);
2248 brelse(d_bh);
2249 kfree(log_blocks);
2250 kfree(real_blocks);
2251 return -1;
2252 }
2253 brelse(real_blocks[i]);
2254 }
2255 cur_dblock =
2256 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2257 ((trans_offset + get_desc_trans_len(desc) +
2258 2) % SB_ONDISK_JOURNAL_SIZE(sb));
2259 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2260 "journal-1095: setting journal " "start to offset %ld",
2261 cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb));
2262
2263 /* init starting values for the first transaction, in case this is the last transaction to be replayed. */
2264 journal->j_start = cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2265 journal->j_last_flush_trans_id = trans_id;
2266 journal->j_trans_id = trans_id + 1;
2267 /* check for trans_id overflow */
2268 if (journal->j_trans_id == 0)
2269 journal->j_trans_id = 10;
2270 brelse(c_bh);
2271 brelse(d_bh);
2272 kfree(log_blocks);
2273 kfree(real_blocks);
2274 return 0;
2275}
2276
2277/* This function reads blocks starting from block and to max_block of bufsize
2278 size (but no more than BUFNR blocks at a time). This proved to improve
2279 mounting speed on self-rebuilding raid5 arrays at least.
2280 Right now it is only used from journal code. But later we might use it
2281 from other places.
2282 Note: Do not use journal_getblk/sb_getblk functions here! */
2283static struct buffer_head *reiserfs_breada(struct block_device *dev,
2284 b_blocknr_t block, int bufsize,
2285 b_blocknr_t max_block)
2286{
2287 struct buffer_head *bhlist[BUFNR];
2288 unsigned int blocks = BUFNR;
2289 struct buffer_head *bh;
2290 int i, j;
2291
2292 bh = __getblk(dev, block, bufsize);
2293 if (buffer_uptodate(bh))
2294 return (bh);
2295
2296 if (block + BUFNR > max_block) {
2297 blocks = max_block - block;
2298 }
2299 bhlist[0] = bh;
2300 j = 1;
2301 for (i = 1; i < blocks; i++) {
2302 bh = __getblk(dev, block + i, bufsize);
2303 if (buffer_uptodate(bh)) {
2304 brelse(bh);
2305 break;
2306 } else
2307 bhlist[j++] = bh;
2308 }
2309 ll_rw_block(READ, j, bhlist);
2310 for (i = 1; i < j; i++)
2311 brelse(bhlist[i]);
2312 bh = bhlist[0];
2313 wait_on_buffer(bh);
2314 if (buffer_uptodate(bh))
2315 return bh;
2316 brelse(bh);
2317 return NULL;
2318}
2319
2320/*
2321** read and replay the log
2322** on a clean unmount, the journal header's next unflushed pointer will be to an invalid
2323** transaction. This tests that before finding all the transactions in the log, which makes normal mount times fast.
2324**
2325** After a crash, this starts with the next unflushed transaction, and replays until it finds one too old, or invalid.
2326**
2327** On exit, it sets things up so the first transaction will work correctly.
2328*/
2329static int journal_read(struct super_block *sb)
2330{
2331 struct reiserfs_journal *journal = SB_JOURNAL(sb);
2332 struct reiserfs_journal_desc *desc;
2333 unsigned int oldest_trans_id = 0;
2334 unsigned int oldest_invalid_trans_id = 0;
2335 time_t start;
2336 unsigned long oldest_start = 0;
2337 unsigned long cur_dblock = 0;
2338 unsigned long newest_mount_id = 9;
2339 struct buffer_head *d_bh;
2340 struct reiserfs_journal_header *jh;
2341 int valid_journal_header = 0;
2342 int replay_count = 0;
2343 int continue_replay = 1;
2344 int ret;
2345 char b[BDEVNAME_SIZE];
2346
2347 cur_dblock = SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2348 reiserfs_info(sb, "checking transaction log (%s)\n",
2349 bdevname(journal->j_dev_bd, b));
2350 start = get_seconds();
2351
2352 /* step 1, read in the journal header block. Check the transaction it says
2353 ** is the first unflushed, and if that transaction is not valid,
2354 ** replay is done
2355 */
2356 journal->j_header_bh = journal_bread(sb,
2357 SB_ONDISK_JOURNAL_1st_BLOCK(sb)
2358 + SB_ONDISK_JOURNAL_SIZE(sb));
2359 if (!journal->j_header_bh) {
2360 return 1;
2361 }
2362 jh = (struct reiserfs_journal_header *)(journal->j_header_bh->b_data);
2363 if (le32_to_cpu(jh->j_first_unflushed_offset) <
2364 SB_ONDISK_JOURNAL_SIZE(sb)
2365 && le32_to_cpu(jh->j_last_flush_trans_id) > 0) {
2366 oldest_start =
2367 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2368 le32_to_cpu(jh->j_first_unflushed_offset);
2369 oldest_trans_id = le32_to_cpu(jh->j_last_flush_trans_id) + 1;
2370 newest_mount_id = le32_to_cpu(jh->j_mount_id);
2371 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2372 "journal-1153: found in "
2373 "header: first_unflushed_offset %d, last_flushed_trans_id "
2374 "%lu", le32_to_cpu(jh->j_first_unflushed_offset),
2375 le32_to_cpu(jh->j_last_flush_trans_id));
2376 valid_journal_header = 1;
2377
2378 /* now, we try to read the first unflushed offset. If it is not valid,
2379 ** there is nothing more we can do, and it makes no sense to read
2380 ** through the whole log.
2381 */
2382 d_bh =
2383 journal_bread(sb,
2384 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2385 le32_to_cpu(jh->j_first_unflushed_offset));
2386 ret = journal_transaction_is_valid(sb, d_bh, NULL, NULL);
2387 if (!ret) {
2388 continue_replay = 0;
2389 }
2390 brelse(d_bh);
2391 goto start_log_replay;
2392 }
2393
2394 /* ok, there are transactions that need to be replayed. start with the first log block, find
2395 ** all the valid transactions, and pick out the oldest.
2396 */
2397 while (continue_replay
2398 && cur_dblock <
2399 (SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2400 SB_ONDISK_JOURNAL_SIZE(sb))) {
2401 /* Note that it is required for blocksize of primary fs device and journal
2402 device to be the same */
2403 d_bh =
2404 reiserfs_breada(journal->j_dev_bd, cur_dblock,
2405 sb->s_blocksize,
2406 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2407 SB_ONDISK_JOURNAL_SIZE(sb));
2408 ret =
2409 journal_transaction_is_valid(sb, d_bh,
2410 &oldest_invalid_trans_id,
2411 &newest_mount_id);
2412 if (ret == 1) {
2413 desc = (struct reiserfs_journal_desc *)d_bh->b_data;
2414 if (oldest_start == 0) { /* init all oldest_ values */
2415 oldest_trans_id = get_desc_trans_id(desc);
2416 oldest_start = d_bh->b_blocknr;
2417 newest_mount_id = get_desc_mount_id(desc);
2418 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2419 "journal-1179: Setting "
2420 "oldest_start to offset %llu, trans_id %lu",
2421 oldest_start -
2422 SB_ONDISK_JOURNAL_1st_BLOCK
2423 (sb), oldest_trans_id);
2424 } else if (oldest_trans_id > get_desc_trans_id(desc)) {
2425 /* one we just read was older */
2426 oldest_trans_id = get_desc_trans_id(desc);
2427 oldest_start = d_bh->b_blocknr;
2428 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2429 "journal-1180: Resetting "
2430 "oldest_start to offset %lu, trans_id %lu",
2431 oldest_start -
2432 SB_ONDISK_JOURNAL_1st_BLOCK
2433 (sb), oldest_trans_id);
2434 }
2435 if (newest_mount_id < get_desc_mount_id(desc)) {
2436 newest_mount_id = get_desc_mount_id(desc);
2437 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2438 "journal-1299: Setting "
2439 "newest_mount_id to %d",
2440 get_desc_mount_id(desc));
2441 }
2442 cur_dblock += get_desc_trans_len(desc) + 2;
2443 } else {
2444 cur_dblock++;
2445 }
2446 brelse(d_bh);
2447 }
2448
2449 start_log_replay:
2450 cur_dblock = oldest_start;
2451 if (oldest_trans_id) {
2452 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2453 "journal-1206: Starting replay "
2454 "from offset %llu, trans_id %lu",
2455 cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2456 oldest_trans_id);
2457
2458 }
2459 replay_count = 0;
2460 while (continue_replay && oldest_trans_id > 0) {
2461 ret =
2462 journal_read_transaction(sb, cur_dblock, oldest_start,
2463 oldest_trans_id, newest_mount_id);
2464 if (ret < 0) {
2465 return ret;
2466 } else if (ret != 0) {
2467 break;
2468 }
2469 cur_dblock =
2470 SB_ONDISK_JOURNAL_1st_BLOCK(sb) + journal->j_start;
2471 replay_count++;
2472 if (cur_dblock == oldest_start)
2473 break;
2474 }
2475
2476 if (oldest_trans_id == 0) {
2477 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2478 "journal-1225: No valid " "transactions found");
2479 }
2480 /* j_start does not get set correctly if we don't replay any transactions.
2481 ** if we had a valid journal_header, set j_start to the first unflushed transaction value,
2482 ** copy the trans_id from the header
2483 */
2484 if (valid_journal_header && replay_count == 0) {
2485 journal->j_start = le32_to_cpu(jh->j_first_unflushed_offset);
2486 journal->j_trans_id =
2487 le32_to_cpu(jh->j_last_flush_trans_id) + 1;
2488 /* check for trans_id overflow */
2489 if (journal->j_trans_id == 0)
2490 journal->j_trans_id = 10;
2491 journal->j_last_flush_trans_id =
2492 le32_to_cpu(jh->j_last_flush_trans_id);
2493 journal->j_mount_id = le32_to_cpu(jh->j_mount_id) + 1;
2494 } else {
2495 journal->j_mount_id = newest_mount_id + 1;
2496 }
2497 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1299: Setting "
2498 "newest_mount_id to %lu", journal->j_mount_id);
2499 journal->j_first_unflushed_offset = journal->j_start;
2500 if (replay_count > 0) {
2501 reiserfs_info(sb,
2502 "replayed %d transactions in %lu seconds\n",
2503 replay_count, get_seconds() - start);
2504 }
2505 if (!bdev_read_only(sb->s_bdev) &&
2506 _update_journal_header_block(sb, journal->j_start,
2507 journal->j_last_flush_trans_id)) {
2508 /* replay failed, caller must call free_journal_ram and abort
2509 ** the mount
2510 */
2511 return -1;
2512 }
2513 return 0;
2514}
2515
2516static struct reiserfs_journal_list *alloc_journal_list(struct super_block *s)
2517{
2518 struct reiserfs_journal_list *jl;
2519 jl = kzalloc(sizeof(struct reiserfs_journal_list),
2520 GFP_NOFS | __GFP_NOFAIL);
2521 INIT_LIST_HEAD(&jl->j_list);
2522 INIT_LIST_HEAD(&jl->j_working_list);
2523 INIT_LIST_HEAD(&jl->j_tail_bh_list);
2524 INIT_LIST_HEAD(&jl->j_bh_list);
2525 mutex_init(&jl->j_commit_mutex);
2526 SB_JOURNAL(s)->j_num_lists++;
2527 get_journal_list(jl);
2528 return jl;
2529}
2530
2531static void journal_list_init(struct super_block *sb)
2532{
2533 SB_JOURNAL(sb)->j_current_jl = alloc_journal_list(sb);
2534}
2535
2536static int release_journal_dev(struct super_block *super,
2537 struct reiserfs_journal *journal)
2538{
2539 int result;
2540
2541 result = 0;
2542
2543 if (journal->j_dev_bd != NULL) {
2544 result = blkdev_put(journal->j_dev_bd, journal->j_dev_mode);
2545 journal->j_dev_bd = NULL;
2546 }
2547
2548 if (result != 0) {
2549 reiserfs_warning(super, "sh-457",
2550 "Cannot release journal device: %i", result);
2551 }
2552 return result;
2553}
2554
2555static int journal_init_dev(struct super_block *super,
2556 struct reiserfs_journal *journal,
2557 const char *jdev_name)
2558{
2559 int result;
2560 dev_t jdev;
2561 fmode_t blkdev_mode = FMODE_READ | FMODE_WRITE | FMODE_EXCL;
2562 char b[BDEVNAME_SIZE];
2563
2564 result = 0;
2565
2566 journal->j_dev_bd = NULL;
2567 jdev = SB_ONDISK_JOURNAL_DEVICE(super) ?
2568 new_decode_dev(SB_ONDISK_JOURNAL_DEVICE(super)) : super->s_dev;
2569
2570 if (bdev_read_only(super->s_bdev))
2571 blkdev_mode = FMODE_READ;
2572
2573 /* there is no "jdev" option and journal is on separate device */
2574 if ((!jdev_name || !jdev_name[0])) {
2575 if (jdev == super->s_dev)
2576 blkdev_mode &= ~FMODE_EXCL;
2577 journal->j_dev_bd = blkdev_get_by_dev(jdev, blkdev_mode,
2578 journal);
2579 journal->j_dev_mode = blkdev_mode;
2580 if (IS_ERR(journal->j_dev_bd)) {
2581 result = PTR_ERR(journal->j_dev_bd);
2582 journal->j_dev_bd = NULL;
2583 reiserfs_warning(super, "sh-458",
2584 "cannot init journal device '%s': %i",
2585 __bdevname(jdev, b), result);
2586 return result;
2587 } else if (jdev != super->s_dev)
2588 set_blocksize(journal->j_dev_bd, super->s_blocksize);
2589
2590 return 0;
2591 }
2592
2593 journal->j_dev_mode = blkdev_mode;
2594 journal->j_dev_bd = blkdev_get_by_path(jdev_name, blkdev_mode, journal);
2595 if (IS_ERR(journal->j_dev_bd)) {
2596 result = PTR_ERR(journal->j_dev_bd);
2597 journal->j_dev_bd = NULL;
2598 reiserfs_warning(super,
2599 "journal_init_dev: Cannot open '%s': %i",
2600 jdev_name, result);
2601 return result;
2602 }
2603
2604 set_blocksize(journal->j_dev_bd, super->s_blocksize);
2605 reiserfs_info(super,
2606 "journal_init_dev: journal device: %s\n",
2607 bdevname(journal->j_dev_bd, b));
2608 return 0;
2609}
2610
2611/**
2612 * When creating/tuning a file system user can assign some
2613 * journal params within boundaries which depend on the ratio
2614 * blocksize/standard_blocksize.
2615 *
2616 * For blocks >= standard_blocksize transaction size should
2617 * be not less then JOURNAL_TRANS_MIN_DEFAULT, and not more
2618 * then JOURNAL_TRANS_MAX_DEFAULT.
2619 *
2620 * For blocks < standard_blocksize these boundaries should be
2621 * decreased proportionally.
2622 */
2623#define REISERFS_STANDARD_BLKSIZE (4096)
2624
2625static int check_advise_trans_params(struct super_block *sb,
2626 struct reiserfs_journal *journal)
2627{
2628 if (journal->j_trans_max) {
2629 /* Non-default journal params.
2630 Do sanity check for them. */
2631 int ratio = 1;
2632 if (sb->s_blocksize < REISERFS_STANDARD_BLKSIZE)
2633 ratio = REISERFS_STANDARD_BLKSIZE / sb->s_blocksize;
2634
2635 if (journal->j_trans_max > JOURNAL_TRANS_MAX_DEFAULT / ratio ||
2636 journal->j_trans_max < JOURNAL_TRANS_MIN_DEFAULT / ratio ||
2637 SB_ONDISK_JOURNAL_SIZE(sb) / journal->j_trans_max <
2638 JOURNAL_MIN_RATIO) {
2639 reiserfs_warning(sb, "sh-462",
2640 "bad transaction max size (%u). "
2641 "FSCK?", journal->j_trans_max);
2642 return 1;
2643 }
2644 if (journal->j_max_batch != (journal->j_trans_max) *
2645 JOURNAL_MAX_BATCH_DEFAULT/JOURNAL_TRANS_MAX_DEFAULT) {
2646 reiserfs_warning(sb, "sh-463",
2647 "bad transaction max batch (%u). "
2648 "FSCK?", journal->j_max_batch);
2649 return 1;
2650 }
2651 } else {
2652 /* Default journal params.
2653 The file system was created by old version
2654 of mkreiserfs, so some fields contain zeros,
2655 and we need to advise proper values for them */
2656 if (sb->s_blocksize != REISERFS_STANDARD_BLKSIZE) {
2657 reiserfs_warning(sb, "sh-464", "bad blocksize (%u)",
2658 sb->s_blocksize);
2659 return 1;
2660 }
2661 journal->j_trans_max = JOURNAL_TRANS_MAX_DEFAULT;
2662 journal->j_max_batch = JOURNAL_MAX_BATCH_DEFAULT;
2663 journal->j_max_commit_age = JOURNAL_MAX_COMMIT_AGE;
2664 }
2665 return 0;
2666}
2667
2668/*
2669** must be called once on fs mount. calls journal_read for you
2670*/
2671int journal_init(struct super_block *sb, const char *j_dev_name,
2672 int old_format, unsigned int commit_max_age)
2673{
2674 int num_cnodes = SB_ONDISK_JOURNAL_SIZE(sb) * 2;
2675 struct buffer_head *bhjh;
2676 struct reiserfs_super_block *rs;
2677 struct reiserfs_journal_header *jh;
2678 struct reiserfs_journal *journal;
2679 struct reiserfs_journal_list *jl;
2680 char b[BDEVNAME_SIZE];
2681 int ret;
2682
2683 /*
2684 * Unlock here to avoid various RECLAIM-FS-ON <-> IN-RECLAIM-FS
2685 * dependency inversion warnings.
2686 */
2687 reiserfs_write_unlock(sb);
2688 journal = SB_JOURNAL(sb) = vmalloc(sizeof(struct reiserfs_journal));
2689 if (!journal) {
2690 reiserfs_warning(sb, "journal-1256",
2691 "unable to get memory for journal structure");
2692 reiserfs_write_lock(sb);
2693 return 1;
2694 }
2695 memset(journal, 0, sizeof(struct reiserfs_journal));
2696 INIT_LIST_HEAD(&journal->j_bitmap_nodes);
2697 INIT_LIST_HEAD(&journal->j_prealloc_list);
2698 INIT_LIST_HEAD(&journal->j_working_list);
2699 INIT_LIST_HEAD(&journal->j_journal_list);
2700 journal->j_persistent_trans = 0;
2701 ret = reiserfs_allocate_list_bitmaps(sb, journal->j_list_bitmap,
2702 reiserfs_bmap_count(sb));
2703 reiserfs_write_lock(sb);
2704 if (ret)
2705 goto free_and_return;
2706
2707 allocate_bitmap_nodes(sb);
2708
2709 /* reserved for journal area support */
2710 SB_JOURNAL_1st_RESERVED_BLOCK(sb) = (old_format ?
2711 REISERFS_OLD_DISK_OFFSET_IN_BYTES
2712 / sb->s_blocksize +
2713 reiserfs_bmap_count(sb) +
2714 1 :
2715 REISERFS_DISK_OFFSET_IN_BYTES /
2716 sb->s_blocksize + 2);
2717
2718 /* Sanity check to see is the standard journal fitting within first bitmap
2719 (actual for small blocksizes) */
2720 if (!SB_ONDISK_JOURNAL_DEVICE(sb) &&
2721 (SB_JOURNAL_1st_RESERVED_BLOCK(sb) +
2722 SB_ONDISK_JOURNAL_SIZE(sb) > sb->s_blocksize * 8)) {
2723 reiserfs_warning(sb, "journal-1393",
2724 "journal does not fit for area addressed "
2725 "by first of bitmap blocks. It starts at "
2726 "%u and its size is %u. Block size %ld",
2727 SB_JOURNAL_1st_RESERVED_BLOCK(sb),
2728 SB_ONDISK_JOURNAL_SIZE(sb),
2729 sb->s_blocksize);
2730 goto free_and_return;
2731 }
2732
2733 /*
2734 * We need to unlock here to avoid creating the following
2735 * dependency:
2736 * reiserfs_lock -> sysfs_mutex
2737 * Because the reiserfs mmap path creates the following dependency:
2738 * mm->mmap -> reiserfs_lock, hence we have
2739 * mm->mmap -> reiserfs_lock ->sysfs_mutex
2740 * This would ends up in a circular dependency with sysfs readdir path
2741 * which does sysfs_mutex -> mm->mmap_sem
2742 * This is fine because the reiserfs lock is useless in mount path,
2743 * at least until we call journal_begin. We keep it for paranoid
2744 * reasons.
2745 */
2746 reiserfs_write_unlock(sb);
2747 if (journal_init_dev(sb, journal, j_dev_name) != 0) {
2748 reiserfs_write_lock(sb);
2749 reiserfs_warning(sb, "sh-462",
2750 "unable to initialize jornal device");
2751 goto free_and_return;
2752 }
2753 reiserfs_write_lock(sb);
2754
2755 rs = SB_DISK_SUPER_BLOCK(sb);
2756
2757 /* read journal header */
2758 bhjh = journal_bread(sb,
2759 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2760 SB_ONDISK_JOURNAL_SIZE(sb));
2761 if (!bhjh) {
2762 reiserfs_warning(sb, "sh-459",
2763 "unable to read journal header");
2764 goto free_and_return;
2765 }
2766 jh = (struct reiserfs_journal_header *)(bhjh->b_data);
2767
2768 /* make sure that journal matches to the super block */
2769 if (is_reiserfs_jr(rs)
2770 && (le32_to_cpu(jh->jh_journal.jp_journal_magic) !=
2771 sb_jp_journal_magic(rs))) {
2772 reiserfs_warning(sb, "sh-460",
2773 "journal header magic %x (device %s) does "
2774 "not match to magic found in super block %x",
2775 jh->jh_journal.jp_journal_magic,
2776 bdevname(journal->j_dev_bd, b),
2777 sb_jp_journal_magic(rs));
2778 brelse(bhjh);
2779 goto free_and_return;
2780 }
2781
2782 journal->j_trans_max = le32_to_cpu(jh->jh_journal.jp_journal_trans_max);
2783 journal->j_max_batch = le32_to_cpu(jh->jh_journal.jp_journal_max_batch);
2784 journal->j_max_commit_age =
2785 le32_to_cpu(jh->jh_journal.jp_journal_max_commit_age);
2786 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
2787
2788 if (check_advise_trans_params(sb, journal) != 0)
2789 goto free_and_return;
2790 journal->j_default_max_commit_age = journal->j_max_commit_age;
2791
2792 if (commit_max_age != 0) {
2793 journal->j_max_commit_age = commit_max_age;
2794 journal->j_max_trans_age = commit_max_age;
2795 }
2796
2797 reiserfs_info(sb, "journal params: device %s, size %u, "
2798 "journal first block %u, max trans len %u, max batch %u, "
2799 "max commit age %u, max trans age %u\n",
2800 bdevname(journal->j_dev_bd, b),
2801 SB_ONDISK_JOURNAL_SIZE(sb),
2802 SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2803 journal->j_trans_max,
2804 journal->j_max_batch,
2805 journal->j_max_commit_age, journal->j_max_trans_age);
2806
2807 brelse(bhjh);
2808
2809 journal->j_list_bitmap_index = 0;
2810 journal_list_init(sb);
2811
2812 memset(journal->j_list_hash_table, 0,
2813 JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *));
2814
2815 INIT_LIST_HEAD(&journal->j_dirty_buffers);
2816 spin_lock_init(&journal->j_dirty_buffers_lock);
2817
2818 journal->j_start = 0;
2819 journal->j_len = 0;
2820 journal->j_len_alloc = 0;
2821 atomic_set(&(journal->j_wcount), 0);
2822 atomic_set(&(journal->j_async_throttle), 0);
2823 journal->j_bcount = 0;
2824 journal->j_trans_start_time = 0;
2825 journal->j_last = NULL;
2826 journal->j_first = NULL;
2827 init_waitqueue_head(&(journal->j_join_wait));
2828 mutex_init(&journal->j_mutex);
2829 mutex_init(&journal->j_flush_mutex);
2830
2831 journal->j_trans_id = 10;
2832 journal->j_mount_id = 10;
2833 journal->j_state = 0;
2834 atomic_set(&(journal->j_jlock), 0);
2835 reiserfs_write_unlock(sb);
2836 journal->j_cnode_free_list = allocate_cnodes(num_cnodes);
2837 reiserfs_write_lock(sb);
2838 journal->j_cnode_free_orig = journal->j_cnode_free_list;
2839 journal->j_cnode_free = journal->j_cnode_free_list ? num_cnodes : 0;
2840 journal->j_cnode_used = 0;
2841 journal->j_must_wait = 0;
2842
2843 if (journal->j_cnode_free == 0) {
2844 reiserfs_warning(sb, "journal-2004", "Journal cnode memory "
2845 "allocation failed (%ld bytes). Journal is "
2846 "too large for available memory. Usually "
2847 "this is due to a journal that is too large.",
2848 sizeof (struct reiserfs_journal_cnode) * num_cnodes);
2849 goto free_and_return;
2850 }
2851
2852 init_journal_hash(sb);
2853 jl = journal->j_current_jl;
2854 jl->j_list_bitmap = get_list_bitmap(sb, jl);
2855 if (!jl->j_list_bitmap) {
2856 reiserfs_warning(sb, "journal-2005",
2857 "get_list_bitmap failed for journal list 0");
2858 goto free_and_return;
2859 }
2860 if (journal_read(sb) < 0) {
2861 reiserfs_warning(sb, "reiserfs-2006",
2862 "Replay Failure, unable to mount");
2863 goto free_and_return;
2864 }
2865
2866 reiserfs_mounted_fs_count++;
2867 if (reiserfs_mounted_fs_count <= 1) {
2868 reiserfs_write_unlock(sb);
2869 commit_wq = alloc_workqueue("reiserfs", WQ_MEM_RECLAIM, 0);
2870 reiserfs_write_lock(sb);
2871 }
2872
2873 INIT_DELAYED_WORK(&journal->j_work, flush_async_commits);
2874 journal->j_work_sb = sb;
2875 return 0;
2876 free_and_return:
2877 free_journal_ram(sb);
2878 return 1;
2879}
2880
2881/*
2882** test for a polite end of the current transaction. Used by file_write, and should
2883** be used by delete to make sure they don't write more than can fit inside a single
2884** transaction
2885*/
2886int journal_transaction_should_end(struct reiserfs_transaction_handle *th,
2887 int new_alloc)
2888{
2889 struct reiserfs_journal *journal = SB_JOURNAL(th->t_super);
2890 time_t now = get_seconds();
2891 /* cannot restart while nested */
2892 BUG_ON(!th->t_trans_id);
2893 if (th->t_refcount > 1)
2894 return 0;
2895 if (journal->j_must_wait > 0 ||
2896 (journal->j_len_alloc + new_alloc) >= journal->j_max_batch ||
2897 atomic_read(&(journal->j_jlock)) ||
2898 (now - journal->j_trans_start_time) > journal->j_max_trans_age ||
2899 journal->j_cnode_free < (journal->j_trans_max * 3)) {
2900 return 1;
2901 }
2902 /* protected by the BKL here */
2903 journal->j_len_alloc += new_alloc;
2904 th->t_blocks_allocated += new_alloc ;
2905 return 0;
2906}
2907
2908/* this must be called inside a transaction, and requires the
2909** kernel_lock to be held
2910*/
2911void reiserfs_block_writes(struct reiserfs_transaction_handle *th)
2912{
2913 struct reiserfs_journal *journal = SB_JOURNAL(th->t_super);
2914 BUG_ON(!th->t_trans_id);
2915 journal->j_must_wait = 1;
2916 set_bit(J_WRITERS_BLOCKED, &journal->j_state);
2917 return;
2918}
2919
2920/* this must be called without a transaction started, and does not
2921** require BKL
2922*/
2923void reiserfs_allow_writes(struct super_block *s)
2924{
2925 struct reiserfs_journal *journal = SB_JOURNAL(s);
2926 clear_bit(J_WRITERS_BLOCKED, &journal->j_state);
2927 wake_up(&journal->j_join_wait);
2928}
2929
2930/* this must be called without a transaction started, and does not
2931** require BKL
2932*/
2933void reiserfs_wait_on_write_block(struct super_block *s)
2934{
2935 struct reiserfs_journal *journal = SB_JOURNAL(s);
2936 wait_event(journal->j_join_wait,
2937 !test_bit(J_WRITERS_BLOCKED, &journal->j_state));
2938}
2939
2940static void queue_log_writer(struct super_block *s)
2941{
2942 wait_queue_t wait;
2943 struct reiserfs_journal *journal = SB_JOURNAL(s);
2944 set_bit(J_WRITERS_QUEUED, &journal->j_state);
2945
2946 /*
2947 * we don't want to use wait_event here because
2948 * we only want to wait once.
2949 */
2950 init_waitqueue_entry(&wait, current);
2951 add_wait_queue(&journal->j_join_wait, &wait);
2952 set_current_state(TASK_UNINTERRUPTIBLE);
2953 if (test_bit(J_WRITERS_QUEUED, &journal->j_state)) {
2954 reiserfs_write_unlock(s);
2955 schedule();
2956 reiserfs_write_lock(s);
2957 }
2958 __set_current_state(TASK_RUNNING);
2959 remove_wait_queue(&journal->j_join_wait, &wait);
2960}
2961
2962static void wake_queued_writers(struct super_block *s)
2963{
2964 struct reiserfs_journal *journal = SB_JOURNAL(s);
2965 if (test_and_clear_bit(J_WRITERS_QUEUED, &journal->j_state))
2966 wake_up(&journal->j_join_wait);
2967}
2968
2969static void let_transaction_grow(struct super_block *sb, unsigned int trans_id)
2970{
2971 struct reiserfs_journal *journal = SB_JOURNAL(sb);
2972 unsigned long bcount = journal->j_bcount;
2973 while (1) {
2974 reiserfs_write_unlock(sb);
2975 schedule_timeout_uninterruptible(1);
2976 reiserfs_write_lock(sb);
2977 journal->j_current_jl->j_state |= LIST_COMMIT_PENDING;
2978 while ((atomic_read(&journal->j_wcount) > 0 ||
2979 atomic_read(&journal->j_jlock)) &&
2980 journal->j_trans_id == trans_id) {
2981 queue_log_writer(sb);
2982 }
2983 if (journal->j_trans_id != trans_id)
2984 break;
2985 if (bcount == journal->j_bcount)
2986 break;
2987 bcount = journal->j_bcount;
2988 }
2989}
2990
2991/* join == true if you must join an existing transaction.
2992** join == false if you can deal with waiting for others to finish
2993**
2994** this will block until the transaction is joinable. send the number of blocks you
2995** expect to use in nblocks.
2996*/
2997static int do_journal_begin_r(struct reiserfs_transaction_handle *th,
2998 struct super_block *sb, unsigned long nblocks,
2999 int join)
3000{
3001 time_t now = get_seconds();
3002 unsigned int old_trans_id;
3003 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3004 struct reiserfs_transaction_handle myth;
3005 int sched_count = 0;
3006 int retval;
3007
3008 reiserfs_check_lock_depth(sb, "journal_begin");
3009 BUG_ON(nblocks > journal->j_trans_max);
3010
3011 PROC_INFO_INC(sb, journal.journal_being);
3012 /* set here for journal_join */
3013 th->t_refcount = 1;
3014 th->t_super = sb;
3015
3016 relock:
3017 lock_journal(sb);
3018 if (join != JBEGIN_ABORT && reiserfs_is_journal_aborted(journal)) {
3019 unlock_journal(sb);
3020 retval = journal->j_errno;
3021 goto out_fail;
3022 }
3023 journal->j_bcount++;
3024
3025 if (test_bit(J_WRITERS_BLOCKED, &journal->j_state)) {
3026 unlock_journal(sb);
3027 reiserfs_write_unlock(sb);
3028 reiserfs_wait_on_write_block(sb);
3029 reiserfs_write_lock(sb);
3030 PROC_INFO_INC(sb, journal.journal_relock_writers);
3031 goto relock;
3032 }
3033 now = get_seconds();
3034
3035 /* if there is no room in the journal OR
3036 ** if this transaction is too old, and we weren't called joinable, wait for it to finish before beginning
3037 ** we don't sleep if there aren't other writers
3038 */
3039
3040 if ((!join && journal->j_must_wait > 0) ||
3041 (!join
3042 && (journal->j_len_alloc + nblocks + 2) >= journal->j_max_batch)
3043 || (!join && atomic_read(&journal->j_wcount) > 0
3044 && journal->j_trans_start_time > 0
3045 && (now - journal->j_trans_start_time) >
3046 journal->j_max_trans_age) || (!join
3047 && atomic_read(&journal->j_jlock))
3048 || (!join && journal->j_cnode_free < (journal->j_trans_max * 3))) {
3049
3050 old_trans_id = journal->j_trans_id;
3051 unlock_journal(sb); /* allow others to finish this transaction */
3052
3053 if (!join && (journal->j_len_alloc + nblocks + 2) >=
3054 journal->j_max_batch &&
3055 ((journal->j_len + nblocks + 2) * 100) <
3056 (journal->j_len_alloc * 75)) {
3057 if (atomic_read(&journal->j_wcount) > 10) {
3058 sched_count++;
3059 queue_log_writer(sb);
3060 goto relock;
3061 }
3062 }
3063 /* don't mess with joining the transaction if all we have to do is
3064 * wait for someone else to do a commit
3065 */
3066 if (atomic_read(&journal->j_jlock)) {
3067 while (journal->j_trans_id == old_trans_id &&
3068 atomic_read(&journal->j_jlock)) {
3069 queue_log_writer(sb);
3070 }
3071 goto relock;
3072 }
3073 retval = journal_join(&myth, sb, 1);
3074 if (retval)
3075 goto out_fail;
3076
3077 /* someone might have ended the transaction while we joined */
3078 if (old_trans_id != journal->j_trans_id) {
3079 retval = do_journal_end(&myth, sb, 1, 0);
3080 } else {
3081 retval = do_journal_end(&myth, sb, 1, COMMIT_NOW);
3082 }
3083
3084 if (retval)
3085 goto out_fail;
3086
3087 PROC_INFO_INC(sb, journal.journal_relock_wcount);
3088 goto relock;
3089 }
3090 /* we are the first writer, set trans_id */
3091 if (journal->j_trans_start_time == 0) {
3092 journal->j_trans_start_time = get_seconds();
3093 }
3094 atomic_inc(&(journal->j_wcount));
3095 journal->j_len_alloc += nblocks;
3096 th->t_blocks_logged = 0;
3097 th->t_blocks_allocated = nblocks;
3098 th->t_trans_id = journal->j_trans_id;
3099 unlock_journal(sb);
3100 INIT_LIST_HEAD(&th->t_list);
3101 return 0;
3102
3103 out_fail:
3104 memset(th, 0, sizeof(*th));
3105 /* Re-set th->t_super, so we can properly keep track of how many
3106 * persistent transactions there are. We need to do this so if this
3107 * call is part of a failed restart_transaction, we can free it later */
3108 th->t_super = sb;
3109 return retval;
3110}
3111
3112struct reiserfs_transaction_handle *reiserfs_persistent_transaction(struct
3113 super_block
3114 *s,
3115 int nblocks)
3116{
3117 int ret;
3118 struct reiserfs_transaction_handle *th;
3119
3120 /* if we're nesting into an existing transaction. It will be
3121 ** persistent on its own
3122 */
3123 if (reiserfs_transaction_running(s)) {
3124 th = current->journal_info;
3125 th->t_refcount++;
3126 BUG_ON(th->t_refcount < 2);
3127
3128 return th;
3129 }
3130 th = kmalloc(sizeof(struct reiserfs_transaction_handle), GFP_NOFS);
3131 if (!th)
3132 return NULL;
3133 ret = journal_begin(th, s, nblocks);
3134 if (ret) {
3135 kfree(th);
3136 return NULL;
3137 }
3138
3139 SB_JOURNAL(s)->j_persistent_trans++;
3140 return th;
3141}
3142
3143int reiserfs_end_persistent_transaction(struct reiserfs_transaction_handle *th)
3144{
3145 struct super_block *s = th->t_super;
3146 int ret = 0;
3147 if (th->t_trans_id)
3148 ret = journal_end(th, th->t_super, th->t_blocks_allocated);
3149 else
3150 ret = -EIO;
3151 if (th->t_refcount == 0) {
3152 SB_JOURNAL(s)->j_persistent_trans--;
3153 kfree(th);
3154 }
3155 return ret;
3156}
3157
3158static int journal_join(struct reiserfs_transaction_handle *th,
3159 struct super_block *sb, unsigned long nblocks)
3160{
3161 struct reiserfs_transaction_handle *cur_th = current->journal_info;
3162
3163 /* this keeps do_journal_end from NULLing out the current->journal_info
3164 ** pointer
3165 */
3166 th->t_handle_save = cur_th;
3167 BUG_ON(cur_th && cur_th->t_refcount > 1);
3168 return do_journal_begin_r(th, sb, nblocks, JBEGIN_JOIN);
3169}
3170
3171int journal_join_abort(struct reiserfs_transaction_handle *th,
3172 struct super_block *sb, unsigned long nblocks)
3173{
3174 struct reiserfs_transaction_handle *cur_th = current->journal_info;
3175
3176 /* this keeps do_journal_end from NULLing out the current->journal_info
3177 ** pointer
3178 */
3179 th->t_handle_save = cur_th;
3180 BUG_ON(cur_th && cur_th->t_refcount > 1);
3181 return do_journal_begin_r(th, sb, nblocks, JBEGIN_ABORT);
3182}
3183
3184int journal_begin(struct reiserfs_transaction_handle *th,
3185 struct super_block *sb, unsigned long nblocks)
3186{
3187 struct reiserfs_transaction_handle *cur_th = current->journal_info;
3188 int ret;
3189
3190 th->t_handle_save = NULL;
3191 if (cur_th) {
3192 /* we are nesting into the current transaction */
3193 if (cur_th->t_super == sb) {
3194 BUG_ON(!cur_th->t_refcount);
3195 cur_th->t_refcount++;
3196 memcpy(th, cur_th, sizeof(*th));
3197 if (th->t_refcount <= 1)
3198 reiserfs_warning(sb, "reiserfs-2005",
3199 "BAD: refcount <= 1, but "
3200 "journal_info != 0");
3201 return 0;
3202 } else {
3203 /* we've ended up with a handle from a different filesystem.
3204 ** save it and restore on journal_end. This should never
3205 ** really happen...
3206 */
3207 reiserfs_warning(sb, "clm-2100",
3208 "nesting info a different FS");
3209 th->t_handle_save = current->journal_info;
3210 current->journal_info = th;
3211 }
3212 } else {
3213 current->journal_info = th;
3214 }
3215 ret = do_journal_begin_r(th, sb, nblocks, JBEGIN_REG);
3216 BUG_ON(current->journal_info != th);
3217
3218 /* I guess this boils down to being the reciprocal of clm-2100 above.
3219 * If do_journal_begin_r fails, we need to put it back, since journal_end
3220 * won't be called to do it. */
3221 if (ret)
3222 current->journal_info = th->t_handle_save;
3223 else
3224 BUG_ON(!th->t_refcount);
3225
3226 return ret;
3227}
3228
3229/*
3230** puts bh into the current transaction. If it was already there, reorders removes the
3231** old pointers from the hash, and puts new ones in (to make sure replay happen in the right order).
3232**
3233** if it was dirty, cleans and files onto the clean list. I can't let it be dirty again until the
3234** transaction is committed.
3235**
3236** if j_len, is bigger than j_len_alloc, it pushes j_len_alloc to 10 + j_len.
3237*/
3238int journal_mark_dirty(struct reiserfs_transaction_handle *th,
3239 struct super_block *sb, struct buffer_head *bh)
3240{
3241 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3242 struct reiserfs_journal_cnode *cn = NULL;
3243 int count_already_incd = 0;
3244 int prepared = 0;
3245 BUG_ON(!th->t_trans_id);
3246
3247 PROC_INFO_INC(sb, journal.mark_dirty);
3248 if (th->t_trans_id != journal->j_trans_id) {
3249 reiserfs_panic(th->t_super, "journal-1577",
3250 "handle trans id %ld != current trans id %ld",
3251 th->t_trans_id, journal->j_trans_id);
3252 }
3253
3254 sb->s_dirt = 1;
3255
3256 prepared = test_clear_buffer_journal_prepared(bh);
3257 clear_buffer_journal_restore_dirty(bh);
3258 /* already in this transaction, we are done */
3259 if (buffer_journaled(bh)) {
3260 PROC_INFO_INC(sb, journal.mark_dirty_already);
3261 return 0;
3262 }
3263
3264 /* this must be turned into a panic instead of a warning. We can't allow
3265 ** a dirty or journal_dirty or locked buffer to be logged, as some changes
3266 ** could get to disk too early. NOT GOOD.
3267 */
3268 if (!prepared || buffer_dirty(bh)) {
3269 reiserfs_warning(sb, "journal-1777",
3270 "buffer %llu bad state "
3271 "%cPREPARED %cLOCKED %cDIRTY %cJDIRTY_WAIT",
3272 (unsigned long long)bh->b_blocknr,
3273 prepared ? ' ' : '!',
3274 buffer_locked(bh) ? ' ' : '!',
3275 buffer_dirty(bh) ? ' ' : '!',
3276 buffer_journal_dirty(bh) ? ' ' : '!');
3277 }
3278
3279 if (atomic_read(&(journal->j_wcount)) <= 0) {
3280 reiserfs_warning(sb, "journal-1409",
3281 "returning because j_wcount was %d",
3282 atomic_read(&(journal->j_wcount)));
3283 return 1;
3284 }
3285 /* this error means I've screwed up, and we've overflowed the transaction.
3286 ** Nothing can be done here, except make the FS readonly or panic.
3287 */
3288 if (journal->j_len >= journal->j_trans_max) {
3289 reiserfs_panic(th->t_super, "journal-1413",
3290 "j_len (%lu) is too big",
3291 journal->j_len);
3292 }
3293
3294 if (buffer_journal_dirty(bh)) {
3295 count_already_incd = 1;
3296 PROC_INFO_INC(sb, journal.mark_dirty_notjournal);
3297 clear_buffer_journal_dirty(bh);
3298 }
3299
3300 if (journal->j_len > journal->j_len_alloc) {
3301 journal->j_len_alloc = journal->j_len + JOURNAL_PER_BALANCE_CNT;
3302 }
3303
3304 set_buffer_journaled(bh);
3305
3306 /* now put this guy on the end */
3307 if (!cn) {
3308 cn = get_cnode(sb);
3309 if (!cn) {
3310 reiserfs_panic(sb, "journal-4", "get_cnode failed!");
3311 }
3312
3313 if (th->t_blocks_logged == th->t_blocks_allocated) {
3314 th->t_blocks_allocated += JOURNAL_PER_BALANCE_CNT;
3315 journal->j_len_alloc += JOURNAL_PER_BALANCE_CNT;
3316 }
3317 th->t_blocks_logged++;
3318 journal->j_len++;
3319
3320 cn->bh = bh;
3321 cn->blocknr = bh->b_blocknr;
3322 cn->sb = sb;
3323 cn->jlist = NULL;
3324 insert_journal_hash(journal->j_hash_table, cn);
3325 if (!count_already_incd) {
3326 get_bh(bh);
3327 }
3328 }
3329 cn->next = NULL;
3330 cn->prev = journal->j_last;
3331 cn->bh = bh;
3332 if (journal->j_last) {
3333 journal->j_last->next = cn;
3334 journal->j_last = cn;
3335 } else {
3336 journal->j_first = cn;
3337 journal->j_last = cn;
3338 }
3339 return 0;
3340}
3341
3342int journal_end(struct reiserfs_transaction_handle *th,
3343 struct super_block *sb, unsigned long nblocks)
3344{
3345 if (!current->journal_info && th->t_refcount > 1)
3346 reiserfs_warning(sb, "REISER-NESTING",
3347 "th NULL, refcount %d", th->t_refcount);
3348
3349 if (!th->t_trans_id) {
3350 WARN_ON(1);
3351 return -EIO;
3352 }
3353
3354 th->t_refcount--;
3355 if (th->t_refcount > 0) {
3356 struct reiserfs_transaction_handle *cur_th =
3357 current->journal_info;
3358
3359 /* we aren't allowed to close a nested transaction on a different
3360 ** filesystem from the one in the task struct
3361 */
3362 BUG_ON(cur_th->t_super != th->t_super);
3363
3364 if (th != cur_th) {
3365 memcpy(current->journal_info, th, sizeof(*th));
3366 th->t_trans_id = 0;
3367 }
3368 return 0;
3369 } else {
3370 return do_journal_end(th, sb, nblocks, 0);
3371 }
3372}
3373
3374/* removes from the current transaction, relsing and descrementing any counters.
3375** also files the removed buffer directly onto the clean list
3376**
3377** called by journal_mark_freed when a block has been deleted
3378**
3379** returns 1 if it cleaned and relsed the buffer. 0 otherwise
3380*/
3381static int remove_from_transaction(struct super_block *sb,
3382 b_blocknr_t blocknr, int already_cleaned)
3383{
3384 struct buffer_head *bh;
3385 struct reiserfs_journal_cnode *cn;
3386 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3387 int ret = 0;
3388
3389 cn = get_journal_hash_dev(sb, journal->j_hash_table, blocknr);
3390 if (!cn || !cn->bh) {
3391 return ret;
3392 }
3393 bh = cn->bh;
3394 if (cn->prev) {
3395 cn->prev->next = cn->next;
3396 }
3397 if (cn->next) {
3398 cn->next->prev = cn->prev;
3399 }
3400 if (cn == journal->j_first) {
3401 journal->j_first = cn->next;
3402 }
3403 if (cn == journal->j_last) {
3404 journal->j_last = cn->prev;
3405 }
3406 if (bh)
3407 remove_journal_hash(sb, journal->j_hash_table, NULL,
3408 bh->b_blocknr, 0);
3409 clear_buffer_journaled(bh); /* don't log this one */
3410
3411 if (!already_cleaned) {
3412 clear_buffer_journal_dirty(bh);
3413 clear_buffer_dirty(bh);
3414 clear_buffer_journal_test(bh);
3415 put_bh(bh);
3416 if (atomic_read(&(bh->b_count)) < 0) {
3417 reiserfs_warning(sb, "journal-1752",
3418 "b_count < 0");
3419 }
3420 ret = 1;
3421 }
3422 journal->j_len--;
3423 journal->j_len_alloc--;
3424 free_cnode(sb, cn);
3425 return ret;
3426}
3427
3428/*
3429** for any cnode in a journal list, it can only be dirtied of all the
3430** transactions that include it are committed to disk.
3431** this checks through each transaction, and returns 1 if you are allowed to dirty,
3432** and 0 if you aren't
3433**
3434** it is called by dirty_journal_list, which is called after flush_commit_list has gotten all the log
3435** blocks for a given transaction on disk
3436**
3437*/
3438static int can_dirty(struct reiserfs_journal_cnode *cn)
3439{
3440 struct super_block *sb = cn->sb;
3441 b_blocknr_t blocknr = cn->blocknr;
3442 struct reiserfs_journal_cnode *cur = cn->hprev;
3443 int can_dirty = 1;
3444
3445 /* first test hprev. These are all newer than cn, so any node here
3446 ** with the same block number and dev means this node can't be sent
3447 ** to disk right now.
3448 */
3449 while (cur && can_dirty) {
3450 if (cur->jlist && cur->bh && cur->blocknr && cur->sb == sb &&
3451 cur->blocknr == blocknr) {
3452 can_dirty = 0;
3453 }
3454 cur = cur->hprev;
3455 }
3456 /* then test hnext. These are all older than cn. As long as they
3457 ** are committed to the log, it is safe to write cn to disk
3458 */
3459 cur = cn->hnext;
3460 while (cur && can_dirty) {
3461 if (cur->jlist && cur->jlist->j_len > 0 &&
3462 atomic_read(&(cur->jlist->j_commit_left)) > 0 && cur->bh &&
3463 cur->blocknr && cur->sb == sb && cur->blocknr == blocknr) {
3464 can_dirty = 0;
3465 }
3466 cur = cur->hnext;
3467 }
3468 return can_dirty;
3469}
3470
3471/* syncs the commit blocks, but does not force the real buffers to disk
3472** will wait until the current transaction is done/committed before returning
3473*/
3474int journal_end_sync(struct reiserfs_transaction_handle *th,
3475 struct super_block *sb, unsigned long nblocks)
3476{
3477 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3478
3479 BUG_ON(!th->t_trans_id);
3480 /* you can sync while nested, very, very bad */
3481 BUG_ON(th->t_refcount > 1);
3482 if (journal->j_len == 0) {
3483 reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
3484 1);
3485 journal_mark_dirty(th, sb, SB_BUFFER_WITH_SB(sb));
3486 }
3487 return do_journal_end(th, sb, nblocks, COMMIT_NOW | WAIT);
3488}
3489
3490/*
3491** writeback the pending async commits to disk
3492*/
3493static void flush_async_commits(struct work_struct *work)
3494{
3495 struct reiserfs_journal *journal =
3496 container_of(work, struct reiserfs_journal, j_work.work);
3497 struct super_block *sb = journal->j_work_sb;
3498 struct reiserfs_journal_list *jl;
3499 struct list_head *entry;
3500
3501 reiserfs_write_lock(sb);
3502 if (!list_empty(&journal->j_journal_list)) {
3503 /* last entry is the youngest, commit it and you get everything */
3504 entry = journal->j_journal_list.prev;
3505 jl = JOURNAL_LIST_ENTRY(entry);
3506 flush_commit_list(sb, jl, 1);
3507 }
3508 reiserfs_write_unlock(sb);
3509}
3510
3511/*
3512** flushes any old transactions to disk
3513** ends the current transaction if it is too old
3514*/
3515int reiserfs_flush_old_commits(struct super_block *sb)
3516{
3517 time_t now;
3518 struct reiserfs_transaction_handle th;
3519 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3520
3521 now = get_seconds();
3522 /* safety check so we don't flush while we are replaying the log during
3523 * mount
3524 */
3525 if (list_empty(&journal->j_journal_list)) {
3526 return 0;
3527 }
3528
3529 /* check the current transaction. If there are no writers, and it is
3530 * too old, finish it, and force the commit blocks to disk
3531 */
3532 if (atomic_read(&journal->j_wcount) <= 0 &&
3533 journal->j_trans_start_time > 0 &&
3534 journal->j_len > 0 &&
3535 (now - journal->j_trans_start_time) > journal->j_max_trans_age) {
3536 if (!journal_join(&th, sb, 1)) {
3537 reiserfs_prepare_for_journal(sb,
3538 SB_BUFFER_WITH_SB(sb),
3539 1);
3540 journal_mark_dirty(&th, sb,
3541 SB_BUFFER_WITH_SB(sb));
3542
3543 /* we're only being called from kreiserfsd, it makes no sense to do
3544 ** an async commit so that kreiserfsd can do it later
3545 */
3546 do_journal_end(&th, sb, 1, COMMIT_NOW | WAIT);
3547 }
3548 }
3549 return sb->s_dirt;
3550}
3551
3552/*
3553** returns 0 if do_journal_end should return right away, returns 1 if do_journal_end should finish the commit
3554**
3555** if the current transaction is too old, but still has writers, this will wait on j_join_wait until all
3556** the writers are done. By the time it wakes up, the transaction it was called has already ended, so it just
3557** flushes the commit list and returns 0.
3558**
3559** Won't batch when flush or commit_now is set. Also won't batch when others are waiting on j_join_wait.
3560**
3561** Note, we can't allow the journal_end to proceed while there are still writers in the log.
3562*/
3563static int check_journal_end(struct reiserfs_transaction_handle *th,
3564 struct super_block *sb, unsigned long nblocks,
3565 int flags)
3566{
3567
3568 time_t now;
3569 int flush = flags & FLUSH_ALL;
3570 int commit_now = flags & COMMIT_NOW;
3571 int wait_on_commit = flags & WAIT;
3572 struct reiserfs_journal_list *jl;
3573 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3574
3575 BUG_ON(!th->t_trans_id);
3576
3577 if (th->t_trans_id != journal->j_trans_id) {
3578 reiserfs_panic(th->t_super, "journal-1577",
3579 "handle trans id %ld != current trans id %ld",
3580 th->t_trans_id, journal->j_trans_id);
3581 }
3582
3583 journal->j_len_alloc -= (th->t_blocks_allocated - th->t_blocks_logged);
3584 if (atomic_read(&(journal->j_wcount)) > 0) { /* <= 0 is allowed. unmounting might not call begin */
3585 atomic_dec(&(journal->j_wcount));
3586 }
3587
3588 /* BUG, deal with case where j_len is 0, but people previously freed blocks need to be released
3589 ** will be dealt with by next transaction that actually writes something, but should be taken
3590 ** care of in this trans
3591 */
3592 BUG_ON(journal->j_len == 0);
3593
3594 /* if wcount > 0, and we are called to with flush or commit_now,
3595 ** we wait on j_join_wait. We will wake up when the last writer has
3596 ** finished the transaction, and started it on its way to the disk.
3597 ** Then, we flush the commit or journal list, and just return 0
3598 ** because the rest of journal end was already done for this transaction.
3599 */
3600 if (atomic_read(&(journal->j_wcount)) > 0) {
3601 if (flush || commit_now) {
3602 unsigned trans_id;
3603
3604 jl = journal->j_current_jl;
3605 trans_id = jl->j_trans_id;
3606 if (wait_on_commit)
3607 jl->j_state |= LIST_COMMIT_PENDING;
3608 atomic_set(&(journal->j_jlock), 1);
3609 if (flush) {
3610 journal->j_next_full_flush = 1;
3611 }
3612 unlock_journal(sb);
3613
3614 /* sleep while the current transaction is still j_jlocked */
3615 while (journal->j_trans_id == trans_id) {
3616 if (atomic_read(&journal->j_jlock)) {
3617 queue_log_writer(sb);
3618 } else {
3619 lock_journal(sb);
3620 if (journal->j_trans_id == trans_id) {
3621 atomic_set(&(journal->j_jlock),
3622 1);
3623 }
3624 unlock_journal(sb);
3625 }
3626 }
3627 BUG_ON(journal->j_trans_id == trans_id);
3628
3629 if (commit_now
3630 && journal_list_still_alive(sb, trans_id)
3631 && wait_on_commit) {
3632 flush_commit_list(sb, jl, 1);
3633 }
3634 return 0;
3635 }
3636 unlock_journal(sb);
3637 return 0;
3638 }
3639
3640 /* deal with old transactions where we are the last writers */
3641 now = get_seconds();
3642 if ((now - journal->j_trans_start_time) > journal->j_max_trans_age) {
3643 commit_now = 1;
3644 journal->j_next_async_flush = 1;
3645 }
3646 /* don't batch when someone is waiting on j_join_wait */
3647 /* don't batch when syncing the commit or flushing the whole trans */
3648 if (!(journal->j_must_wait > 0) && !(atomic_read(&(journal->j_jlock)))
3649 && !flush && !commit_now && (journal->j_len < journal->j_max_batch)
3650 && journal->j_len_alloc < journal->j_max_batch
3651 && journal->j_cnode_free > (journal->j_trans_max * 3)) {
3652 journal->j_bcount++;
3653 unlock_journal(sb);
3654 return 0;
3655 }
3656
3657 if (journal->j_start > SB_ONDISK_JOURNAL_SIZE(sb)) {
3658 reiserfs_panic(sb, "journal-003",
3659 "j_start (%ld) is too high",
3660 journal->j_start);
3661 }
3662 return 1;
3663}
3664
3665/*
3666** Does all the work that makes deleting blocks safe.
3667** when deleting a block mark BH_JNew, just remove it from the current transaction, clean it's buffer_head and move on.
3668**
3669** otherwise:
3670** set a bit for the block in the journal bitmap. That will prevent it from being allocated for unformatted nodes
3671** before this transaction has finished.
3672**
3673** mark any cnodes for this block as BLOCK_FREED, and clear their bh pointers. That will prevent any old transactions with
3674** this block from trying to flush to the real location. Since we aren't removing the cnode from the journal_list_hash,
3675** the block can't be reallocated yet.
3676**
3677** Then remove it from the current transaction, decrementing any counters and filing it on the clean list.
3678*/
3679int journal_mark_freed(struct reiserfs_transaction_handle *th,
3680 struct super_block *sb, b_blocknr_t blocknr)
3681{
3682 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3683 struct reiserfs_journal_cnode *cn = NULL;
3684 struct buffer_head *bh = NULL;
3685 struct reiserfs_list_bitmap *jb = NULL;
3686 int cleaned = 0;
3687 BUG_ON(!th->t_trans_id);
3688
3689 cn = get_journal_hash_dev(sb, journal->j_hash_table, blocknr);
3690 if (cn && cn->bh) {
3691 bh = cn->bh;
3692 get_bh(bh);
3693 }
3694 /* if it is journal new, we just remove it from this transaction */
3695 if (bh && buffer_journal_new(bh)) {
3696 clear_buffer_journal_new(bh);
3697 clear_prepared_bits(bh);
3698 reiserfs_clean_and_file_buffer(bh);
3699 cleaned = remove_from_transaction(sb, blocknr, cleaned);
3700 } else {
3701 /* set the bit for this block in the journal bitmap for this transaction */
3702 jb = journal->j_current_jl->j_list_bitmap;
3703 if (!jb) {
3704 reiserfs_panic(sb, "journal-1702",
3705 "journal_list_bitmap is NULL");
3706 }
3707 set_bit_in_list_bitmap(sb, blocknr, jb);
3708
3709 /* Note, the entire while loop is not allowed to schedule. */
3710
3711 if (bh) {
3712 clear_prepared_bits(bh);
3713 reiserfs_clean_and_file_buffer(bh);
3714 }
3715 cleaned = remove_from_transaction(sb, blocknr, cleaned);
3716
3717 /* find all older transactions with this block, make sure they don't try to write it out */
3718 cn = get_journal_hash_dev(sb, journal->j_list_hash_table,
3719 blocknr);
3720 while (cn) {
3721 if (sb == cn->sb && blocknr == cn->blocknr) {
3722 set_bit(BLOCK_FREED, &cn->state);
3723 if (cn->bh) {
3724 if (!cleaned) {
3725 /* remove_from_transaction will brelse the buffer if it was
3726 ** in the current trans
3727 */
3728 clear_buffer_journal_dirty(cn->
3729 bh);
3730 clear_buffer_dirty(cn->bh);
3731 clear_buffer_journal_test(cn->
3732 bh);
3733 cleaned = 1;
3734 put_bh(cn->bh);
3735 if (atomic_read
3736 (&(cn->bh->b_count)) < 0) {
3737 reiserfs_warning(sb,
3738 "journal-2138",
3739 "cn->bh->b_count < 0");
3740 }
3741 }
3742 if (cn->jlist) { /* since we are clearing the bh, we MUST dec nonzerolen */
3743 atomic_dec(&
3744 (cn->jlist->
3745 j_nonzerolen));
3746 }
3747 cn->bh = NULL;
3748 }
3749 }
3750 cn = cn->hnext;
3751 }
3752 }
3753
3754 if (bh)
3755 release_buffer_page(bh); /* get_hash grabs the buffer */
3756 return 0;
3757}
3758
3759void reiserfs_update_inode_transaction(struct inode *inode)
3760{
3761 struct reiserfs_journal *journal = SB_JOURNAL(inode->i_sb);
3762 REISERFS_I(inode)->i_jl = journal->j_current_jl;
3763 REISERFS_I(inode)->i_trans_id = journal->j_trans_id;
3764}
3765
3766/*
3767 * returns -1 on error, 0 if no commits/barriers were done and 1
3768 * if a transaction was actually committed and the barrier was done
3769 */
3770static int __commit_trans_jl(struct inode *inode, unsigned long id,
3771 struct reiserfs_journal_list *jl)
3772{
3773 struct reiserfs_transaction_handle th;
3774 struct super_block *sb = inode->i_sb;
3775 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3776 int ret = 0;
3777
3778 /* is it from the current transaction, or from an unknown transaction? */
3779 if (id == journal->j_trans_id) {
3780 jl = journal->j_current_jl;
3781 /* try to let other writers come in and grow this transaction */
3782 let_transaction_grow(sb, id);
3783 if (journal->j_trans_id != id) {
3784 goto flush_commit_only;
3785 }
3786
3787 ret = journal_begin(&th, sb, 1);
3788 if (ret)
3789 return ret;
3790
3791 /* someone might have ended this transaction while we joined */
3792 if (journal->j_trans_id != id) {
3793 reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
3794 1);
3795 journal_mark_dirty(&th, sb, SB_BUFFER_WITH_SB(sb));
3796 ret = journal_end(&th, sb, 1);
3797 goto flush_commit_only;
3798 }
3799
3800 ret = journal_end_sync(&th, sb, 1);
3801 if (!ret)
3802 ret = 1;
3803
3804 } else {
3805 /* this gets tricky, we have to make sure the journal list in
3806 * the inode still exists. We know the list is still around
3807 * if we've got a larger transaction id than the oldest list
3808 */
3809 flush_commit_only:
3810 if (journal_list_still_alive(inode->i_sb, id)) {
3811 /*
3812 * we only set ret to 1 when we know for sure
3813 * the barrier hasn't been started yet on the commit
3814 * block.
3815 */
3816 if (atomic_read(&jl->j_commit_left) > 1)
3817 ret = 1;
3818 flush_commit_list(sb, jl, 1);
3819 if (journal->j_errno)
3820 ret = journal->j_errno;
3821 }
3822 }
3823 /* otherwise the list is gone, and long since committed */
3824 return ret;
3825}
3826
3827int reiserfs_commit_for_inode(struct inode *inode)
3828{
3829 unsigned int id = REISERFS_I(inode)->i_trans_id;
3830 struct reiserfs_journal_list *jl = REISERFS_I(inode)->i_jl;
3831
3832 /* for the whole inode, assume unset id means it was
3833 * changed in the current transaction. More conservative
3834 */
3835 if (!id || !jl) {
3836 reiserfs_update_inode_transaction(inode);
3837 id = REISERFS_I(inode)->i_trans_id;
3838 /* jl will be updated in __commit_trans_jl */
3839 }
3840
3841 return __commit_trans_jl(inode, id, jl);
3842}
3843
3844void reiserfs_restore_prepared_buffer(struct super_block *sb,
3845 struct buffer_head *bh)
3846{
3847 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3848 PROC_INFO_INC(sb, journal.restore_prepared);
3849 if (!bh) {
3850 return;
3851 }
3852 if (test_clear_buffer_journal_restore_dirty(bh) &&
3853 buffer_journal_dirty(bh)) {
3854 struct reiserfs_journal_cnode *cn;
3855 cn = get_journal_hash_dev(sb,
3856 journal->j_list_hash_table,
3857 bh->b_blocknr);
3858 if (cn && can_dirty(cn)) {
3859 set_buffer_journal_test(bh);
3860 mark_buffer_dirty(bh);
3861 }
3862 }
3863 clear_buffer_journal_prepared(bh);
3864}
3865
3866extern struct tree_balance *cur_tb;
3867/*
3868** before we can change a metadata block, we have to make sure it won't
3869** be written to disk while we are altering it. So, we must:
3870** clean it
3871** wait on it.
3872**
3873*/
3874int reiserfs_prepare_for_journal(struct super_block *sb,
3875 struct buffer_head *bh, int wait)
3876{
3877 PROC_INFO_INC(sb, journal.prepare);
3878
3879 if (!trylock_buffer(bh)) {
3880 if (!wait)
3881 return 0;
3882 lock_buffer(bh);
3883 }
3884 set_buffer_journal_prepared(bh);
3885 if (test_clear_buffer_dirty(bh) && buffer_journal_dirty(bh)) {
3886 clear_buffer_journal_test(bh);
3887 set_buffer_journal_restore_dirty(bh);
3888 }
3889 unlock_buffer(bh);
3890 return 1;
3891}
3892
3893static void flush_old_journal_lists(struct super_block *s)
3894{
3895 struct reiserfs_journal *journal = SB_JOURNAL(s);
3896 struct reiserfs_journal_list *jl;
3897 struct list_head *entry;
3898 time_t now = get_seconds();
3899
3900 while (!list_empty(&journal->j_journal_list)) {
3901 entry = journal->j_journal_list.next;
3902 jl = JOURNAL_LIST_ENTRY(entry);
3903 /* this check should always be run, to send old lists to disk */
3904 if (jl->j_timestamp < (now - (JOURNAL_MAX_TRANS_AGE * 4)) &&
3905 atomic_read(&jl->j_commit_left) == 0 &&
3906 test_transaction(s, jl)) {
3907 flush_used_journal_lists(s, jl);
3908 } else {
3909 break;
3910 }
3911 }
3912}
3913
3914/*
3915** long and ugly. If flush, will not return until all commit
3916** blocks and all real buffers in the trans are on disk.
3917** If no_async, won't return until all commit blocks are on disk.
3918**
3919** keep reading, there are comments as you go along
3920**
3921** If the journal is aborted, we just clean up. Things like flushing
3922** journal lists, etc just won't happen.
3923*/
3924static int do_journal_end(struct reiserfs_transaction_handle *th,
3925 struct super_block *sb, unsigned long nblocks,
3926 int flags)
3927{
3928 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3929 struct reiserfs_journal_cnode *cn, *next, *jl_cn;
3930 struct reiserfs_journal_cnode *last_cn = NULL;
3931 struct reiserfs_journal_desc *desc;
3932 struct reiserfs_journal_commit *commit;
3933 struct buffer_head *c_bh; /* commit bh */
3934 struct buffer_head *d_bh; /* desc bh */
3935 int cur_write_start = 0; /* start index of current log write */
3936 int old_start;
3937 int i;
3938 int flush;
3939 int wait_on_commit;
3940 struct reiserfs_journal_list *jl, *temp_jl;
3941 struct list_head *entry, *safe;
3942 unsigned long jindex;
3943 unsigned int commit_trans_id;
3944 int trans_half;
3945
3946 BUG_ON(th->t_refcount > 1);
3947 BUG_ON(!th->t_trans_id);
3948
3949 /* protect flush_older_commits from doing mistakes if the
3950 transaction ID counter gets overflowed. */
3951 if (th->t_trans_id == ~0U)
3952 flags |= FLUSH_ALL | COMMIT_NOW | WAIT;
3953 flush = flags & FLUSH_ALL;
3954 wait_on_commit = flags & WAIT;
3955
3956 current->journal_info = th->t_handle_save;
3957 reiserfs_check_lock_depth(sb, "journal end");
3958 if (journal->j_len == 0) {
3959 reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
3960 1);
3961 journal_mark_dirty(th, sb, SB_BUFFER_WITH_SB(sb));
3962 }
3963
3964 lock_journal(sb);
3965 if (journal->j_next_full_flush) {
3966 flags |= FLUSH_ALL;
3967 flush = 1;
3968 }
3969 if (journal->j_next_async_flush) {
3970 flags |= COMMIT_NOW | WAIT;
3971 wait_on_commit = 1;
3972 }
3973
3974 /* check_journal_end locks the journal, and unlocks if it does not return 1
3975 ** it tells us if we should continue with the journal_end, or just return
3976 */
3977 if (!check_journal_end(th, sb, nblocks, flags)) {
3978 sb->s_dirt = 1;
3979 wake_queued_writers(sb);
3980 reiserfs_async_progress_wait(sb);
3981 goto out;
3982 }
3983
3984 /* check_journal_end might set these, check again */
3985 if (journal->j_next_full_flush) {
3986 flush = 1;
3987 }
3988
3989 /*
3990 ** j must wait means we have to flush the log blocks, and the real blocks for
3991 ** this transaction
3992 */
3993 if (journal->j_must_wait > 0) {
3994 flush = 1;
3995 }
3996#ifdef REISERFS_PREALLOCATE
3997 /* quota ops might need to nest, setup the journal_info pointer for them
3998 * and raise the refcount so that it is > 0. */
3999 current->journal_info = th;
4000 th->t_refcount++;
4001 reiserfs_discard_all_prealloc(th); /* it should not involve new blocks into
4002 * the transaction */
4003 th->t_refcount--;
4004 current->journal_info = th->t_handle_save;
4005#endif
4006
4007 /* setup description block */
4008 d_bh =
4009 journal_getblk(sb,
4010 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
4011 journal->j_start);
4012 set_buffer_uptodate(d_bh);
4013 desc = (struct reiserfs_journal_desc *)(d_bh)->b_data;
4014 memset(d_bh->b_data, 0, d_bh->b_size);
4015 memcpy(get_journal_desc_magic(d_bh), JOURNAL_DESC_MAGIC, 8);
4016 set_desc_trans_id(desc, journal->j_trans_id);
4017
4018 /* setup commit block. Don't write (keep it clean too) this one until after everyone else is written */
4019 c_bh = journal_getblk(sb, SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
4020 ((journal->j_start + journal->j_len +
4021 1) % SB_ONDISK_JOURNAL_SIZE(sb)));
4022 commit = (struct reiserfs_journal_commit *)c_bh->b_data;
4023 memset(c_bh->b_data, 0, c_bh->b_size);
4024 set_commit_trans_id(commit, journal->j_trans_id);
4025 set_buffer_uptodate(c_bh);
4026
4027 /* init this journal list */
4028 jl = journal->j_current_jl;
4029
4030 /* we lock the commit before doing anything because
4031 * we want to make sure nobody tries to run flush_commit_list until
4032 * the new transaction is fully setup, and we've already flushed the
4033 * ordered bh list
4034 */
4035 reiserfs_mutex_lock_safe(&jl->j_commit_mutex, sb);
4036
4037 /* save the transaction id in case we need to commit it later */
4038 commit_trans_id = jl->j_trans_id;
4039
4040 atomic_set(&jl->j_older_commits_done, 0);
4041 jl->j_trans_id = journal->j_trans_id;
4042 jl->j_timestamp = journal->j_trans_start_time;
4043 jl->j_commit_bh = c_bh;
4044 jl->j_start = journal->j_start;
4045 jl->j_len = journal->j_len;
4046 atomic_set(&jl->j_nonzerolen, journal->j_len);
4047 atomic_set(&jl->j_commit_left, journal->j_len + 2);
4048 jl->j_realblock = NULL;
4049
4050 /* The ENTIRE FOR LOOP MUST not cause schedule to occur.
4051 ** for each real block, add it to the journal list hash,
4052 ** copy into real block index array in the commit or desc block
4053 */
4054 trans_half = journal_trans_half(sb->s_blocksize);
4055 for (i = 0, cn = journal->j_first; cn; cn = cn->next, i++) {
4056 if (buffer_journaled(cn->bh)) {
4057 jl_cn = get_cnode(sb);
4058 if (!jl_cn) {
4059 reiserfs_panic(sb, "journal-1676",
4060 "get_cnode returned NULL");
4061 }
4062 if (i == 0) {
4063 jl->j_realblock = jl_cn;
4064 }
4065 jl_cn->prev = last_cn;
4066 jl_cn->next = NULL;
4067 if (last_cn) {
4068 last_cn->next = jl_cn;
4069 }
4070 last_cn = jl_cn;
4071 /* make sure the block we are trying to log is not a block
4072 of journal or reserved area */
4073
4074 if (is_block_in_log_or_reserved_area
4075 (sb, cn->bh->b_blocknr)) {
4076 reiserfs_panic(sb, "journal-2332",
4077 "Trying to log block %lu, "
4078 "which is a log block",
4079 cn->bh->b_blocknr);
4080 }
4081 jl_cn->blocknr = cn->bh->b_blocknr;
4082 jl_cn->state = 0;
4083 jl_cn->sb = sb;
4084 jl_cn->bh = cn->bh;
4085 jl_cn->jlist = jl;
4086 insert_journal_hash(journal->j_list_hash_table, jl_cn);
4087 if (i < trans_half) {
4088 desc->j_realblock[i] =
4089 cpu_to_le32(cn->bh->b_blocknr);
4090 } else {
4091 commit->j_realblock[i - trans_half] =
4092 cpu_to_le32(cn->bh->b_blocknr);
4093 }
4094 } else {
4095 i--;
4096 }
4097 }
4098 set_desc_trans_len(desc, journal->j_len);
4099 set_desc_mount_id(desc, journal->j_mount_id);
4100 set_desc_trans_id(desc, journal->j_trans_id);
4101 set_commit_trans_len(commit, journal->j_len);
4102
4103 /* special check in case all buffers in the journal were marked for not logging */
4104 BUG_ON(journal->j_len == 0);
4105
4106 /* we're about to dirty all the log blocks, mark the description block
4107 * dirty now too. Don't mark the commit block dirty until all the
4108 * others are on disk
4109 */
4110 mark_buffer_dirty(d_bh);
4111
4112 /* first data block is j_start + 1, so add one to cur_write_start wherever you use it */
4113 cur_write_start = journal->j_start;
4114 cn = journal->j_first;
4115 jindex = 1; /* start at one so we don't get the desc again */
4116 while (cn) {
4117 clear_buffer_journal_new(cn->bh);
4118 /* copy all the real blocks into log area. dirty log blocks */
4119 if (buffer_journaled(cn->bh)) {
4120 struct buffer_head *tmp_bh;
4121 char *addr;
4122 struct page *page;
4123 tmp_bh =
4124 journal_getblk(sb,
4125 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
4126 ((cur_write_start +
4127 jindex) %
4128 SB_ONDISK_JOURNAL_SIZE(sb)));
4129 set_buffer_uptodate(tmp_bh);
4130 page = cn->bh->b_page;
4131 addr = kmap(page);
4132 memcpy(tmp_bh->b_data,
4133 addr + offset_in_page(cn->bh->b_data),
4134 cn->bh->b_size);
4135 kunmap(page);
4136 mark_buffer_dirty(tmp_bh);
4137 jindex++;
4138 set_buffer_journal_dirty(cn->bh);
4139 clear_buffer_journaled(cn->bh);
4140 } else {
4141 /* JDirty cleared sometime during transaction. don't log this one */
4142 reiserfs_warning(sb, "journal-2048",
4143 "BAD, buffer in journal hash, "
4144 "but not JDirty!");
4145 brelse(cn->bh);
4146 }
4147 next = cn->next;
4148 free_cnode(sb, cn);
4149 cn = next;
4150 reiserfs_write_unlock(sb);
4151 cond_resched();
4152 reiserfs_write_lock(sb);
4153 }
4154
4155 /* we are done with both the c_bh and d_bh, but
4156 ** c_bh must be written after all other commit blocks,
4157 ** so we dirty/relse c_bh in flush_commit_list, with commit_left <= 1.
4158 */
4159
4160 journal->j_current_jl = alloc_journal_list(sb);
4161
4162 /* now it is safe to insert this transaction on the main list */
4163 list_add_tail(&jl->j_list, &journal->j_journal_list);
4164 list_add_tail(&jl->j_working_list, &journal->j_working_list);
4165 journal->j_num_work_lists++;
4166
4167 /* reset journal values for the next transaction */
4168 old_start = journal->j_start;
4169 journal->j_start =
4170 (journal->j_start + journal->j_len +
4171 2) % SB_ONDISK_JOURNAL_SIZE(sb);
4172 atomic_set(&(journal->j_wcount), 0);
4173 journal->j_bcount = 0;
4174 journal->j_last = NULL;
4175 journal->j_first = NULL;
4176 journal->j_len = 0;
4177 journal->j_trans_start_time = 0;
4178 /* check for trans_id overflow */
4179 if (++journal->j_trans_id == 0)
4180 journal->j_trans_id = 10;
4181 journal->j_current_jl->j_trans_id = journal->j_trans_id;
4182 journal->j_must_wait = 0;
4183 journal->j_len_alloc = 0;
4184 journal->j_next_full_flush = 0;
4185 journal->j_next_async_flush = 0;
4186 init_journal_hash(sb);
4187
4188 // make sure reiserfs_add_jh sees the new current_jl before we
4189 // write out the tails
4190 smp_mb();
4191
4192 /* tail conversion targets have to hit the disk before we end the
4193 * transaction. Otherwise a later transaction might repack the tail
4194 * before this transaction commits, leaving the data block unflushed and
4195 * clean, if we crash before the later transaction commits, the data block
4196 * is lost.
4197 */
4198 if (!list_empty(&jl->j_tail_bh_list)) {
4199 reiserfs_write_unlock(sb);
4200 write_ordered_buffers(&journal->j_dirty_buffers_lock,
4201 journal, jl, &jl->j_tail_bh_list);
4202 reiserfs_write_lock(sb);
4203 }
4204 BUG_ON(!list_empty(&jl->j_tail_bh_list));
4205 mutex_unlock(&jl->j_commit_mutex);
4206
4207 /* honor the flush wishes from the caller, simple commits can
4208 ** be done outside the journal lock, they are done below
4209 **
4210 ** if we don't flush the commit list right now, we put it into
4211 ** the work queue so the people waiting on the async progress work
4212 ** queue don't wait for this proc to flush journal lists and such.
4213 */
4214 if (flush) {
4215 flush_commit_list(sb, jl, 1);
4216 flush_journal_list(sb, jl, 1);
4217 } else if (!(jl->j_state & LIST_COMMIT_PENDING))
4218 queue_delayed_work(commit_wq, &journal->j_work, HZ / 10);
4219
4220 /* if the next transaction has any chance of wrapping, flush
4221 ** transactions that might get overwritten. If any journal lists are very
4222 ** old flush them as well.
4223 */
4224 first_jl:
4225 list_for_each_safe(entry, safe, &journal->j_journal_list) {
4226 temp_jl = JOURNAL_LIST_ENTRY(entry);
4227 if (journal->j_start <= temp_jl->j_start) {
4228 if ((journal->j_start + journal->j_trans_max + 1) >=
4229 temp_jl->j_start) {
4230 flush_used_journal_lists(sb, temp_jl);
4231 goto first_jl;
4232 } else if ((journal->j_start +
4233 journal->j_trans_max + 1) <
4234 SB_ONDISK_JOURNAL_SIZE(sb)) {
4235 /* if we don't cross into the next transaction and we don't
4236 * wrap, there is no way we can overlap any later transactions
4237 * break now
4238 */
4239 break;
4240 }
4241 } else if ((journal->j_start +
4242 journal->j_trans_max + 1) >
4243 SB_ONDISK_JOURNAL_SIZE(sb)) {
4244 if (((journal->j_start + journal->j_trans_max + 1) %
4245 SB_ONDISK_JOURNAL_SIZE(sb)) >=
4246 temp_jl->j_start) {
4247 flush_used_journal_lists(sb, temp_jl);
4248 goto first_jl;
4249 } else {
4250 /* we don't overlap anything from out start to the end of the
4251 * log, and our wrapped portion doesn't overlap anything at
4252 * the start of the log. We can break
4253 */
4254 break;
4255 }
4256 }
4257 }
4258 flush_old_journal_lists(sb);
4259
4260 journal->j_current_jl->j_list_bitmap =
4261 get_list_bitmap(sb, journal->j_current_jl);
4262
4263 if (!(journal->j_current_jl->j_list_bitmap)) {
4264 reiserfs_panic(sb, "journal-1996",
4265 "could not get a list bitmap");
4266 }
4267
4268 atomic_set(&(journal->j_jlock), 0);
4269 unlock_journal(sb);
4270 /* wake up any body waiting to join. */
4271 clear_bit(J_WRITERS_QUEUED, &journal->j_state);
4272 wake_up(&(journal->j_join_wait));
4273
4274 if (!flush && wait_on_commit &&
4275 journal_list_still_alive(sb, commit_trans_id)) {
4276 flush_commit_list(sb, jl, 1);
4277 }
4278 out:
4279 reiserfs_check_lock_depth(sb, "journal end2");
4280
4281 memset(th, 0, sizeof(*th));
4282 /* Re-set th->t_super, so we can properly keep track of how many
4283 * persistent transactions there are. We need to do this so if this
4284 * call is part of a failed restart_transaction, we can free it later */
4285 th->t_super = sb;
4286
4287 return journal->j_errno;
4288}
4289
4290/* Send the file system read only and refuse new transactions */
4291void reiserfs_abort_journal(struct super_block *sb, int errno)
4292{
4293 struct reiserfs_journal *journal = SB_JOURNAL(sb);
4294 if (test_bit(J_ABORTED, &journal->j_state))
4295 return;
4296
4297 if (!journal->j_errno)
4298 journal->j_errno = errno;
4299
4300 sb->s_flags |= MS_RDONLY;
4301 set_bit(J_ABORTED, &journal->j_state);
4302
4303#ifdef CONFIG_REISERFS_CHECK
4304 dump_stack();
4305#endif
4306}