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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Write ahead logging implementation copyright Chris Mason 2000
4 *
5 * The background commits make this code very interrelated, and
6 * overly complex. I need to rethink things a bit....The major players:
7 *
8 * journal_begin -- call with the number of blocks you expect to log.
9 * If the current transaction is too
10 * old, it will block until the current transaction is
11 * finished, and then start a new one.
12 * Usually, your transaction will get joined in with
13 * previous ones for speed.
14 *
15 * journal_join -- same as journal_begin, but won't block on the current
16 * transaction regardless of age. Don't ever call
17 * this. Ever. There are only two places it should be
18 * called from, and they are both inside this file.
19 *
20 * journal_mark_dirty -- adds blocks into this transaction. clears any flags
21 * that might make them get sent to disk
22 * and then marks them BH_JDirty. Puts the buffer head
23 * into the current transaction hash.
24 *
25 * journal_end -- if the current transaction is batchable, it does nothing
26 * otherwise, it could do an async/synchronous commit, or
27 * a full flush of all log and real blocks in the
28 * transaction.
29 *
30 * flush_old_commits -- if the current transaction is too old, it is ended and
31 * commit blocks are sent to disk. Forces commit blocks
32 * to disk for all backgrounded commits that have been
33 * around too long.
34 * -- Note, if you call this as an immediate flush from
35 * within kupdate, it will ignore the immediate flag
36 */
37
38#include <linux/time.h>
39#include <linux/semaphore.h>
40#include <linux/vmalloc.h>
41#include "reiserfs.h"
42#include <linux/kernel.h>
43#include <linux/errno.h>
44#include <linux/fcntl.h>
45#include <linux/stat.h>
46#include <linux/string.h>
47#include <linux/buffer_head.h>
48#include <linux/workqueue.h>
49#include <linux/writeback.h>
50#include <linux/blkdev.h>
51#include <linux/backing-dev.h>
52#include <linux/uaccess.h>
53#include <linux/slab.h>
54
55
56/* gets a struct reiserfs_journal_list * from a list head */
57#define JOURNAL_LIST_ENTRY(h) (list_entry((h), struct reiserfs_journal_list, \
58 j_list))
59
60/* must be correct to keep the desc and commit structs at 4k */
61#define JOURNAL_TRANS_HALF 1018
62#define BUFNR 64 /*read ahead */
63
64/* cnode stat bits. Move these into reiserfs_fs.h */
65
66/* this block was freed, and can't be written. */
67#define BLOCK_FREED 2
68/* this block was freed during this transaction, and can't be written */
69#define BLOCK_FREED_HOLDER 3
70
71/* used in flush_journal_list */
72#define BLOCK_NEEDS_FLUSH 4
73#define BLOCK_DIRTIED 5
74
75/* journal list state bits */
76#define LIST_TOUCHED 1
77#define LIST_DIRTY 2
78#define LIST_COMMIT_PENDING 4 /* someone will commit this list */
79
80/* flags for do_journal_end */
81#define FLUSH_ALL 1 /* flush commit and real blocks */
82#define COMMIT_NOW 2 /* end and commit this transaction */
83#define WAIT 4 /* wait for the log blocks to hit the disk */
84
85static int do_journal_end(struct reiserfs_transaction_handle *, int flags);
86static int flush_journal_list(struct super_block *s,
87 struct reiserfs_journal_list *jl, int flushall);
88static int flush_commit_list(struct super_block *s,
89 struct reiserfs_journal_list *jl, int flushall);
90static int can_dirty(struct reiserfs_journal_cnode *cn);
91static int journal_join(struct reiserfs_transaction_handle *th,
92 struct super_block *sb);
93static void release_journal_dev(struct super_block *super,
94 struct reiserfs_journal *journal);
95static void dirty_one_transaction(struct super_block *s,
96 struct reiserfs_journal_list *jl);
97static void flush_async_commits(struct work_struct *work);
98static void queue_log_writer(struct super_block *s);
99
100/* values for join in do_journal_begin_r */
101enum {
102 JBEGIN_REG = 0, /* regular journal begin */
103 /* join the running transaction if at all possible */
104 JBEGIN_JOIN = 1,
105 /* called from cleanup code, ignores aborted flag */
106 JBEGIN_ABORT = 2,
107};
108
109static int do_journal_begin_r(struct reiserfs_transaction_handle *th,
110 struct super_block *sb,
111 unsigned long nblocks, int join);
112
113static void init_journal_hash(struct super_block *sb)
114{
115 struct reiserfs_journal *journal = SB_JOURNAL(sb);
116 memset(journal->j_hash_table, 0,
117 JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *));
118}
119
120/*
121 * clears BH_Dirty and sticks the buffer on the clean list. Called because
122 * I can't allow refile_buffer to make schedule happen after I've freed a
123 * block. Look at remove_from_transaction and journal_mark_freed for
124 * more details.
125 */
126static int reiserfs_clean_and_file_buffer(struct buffer_head *bh)
127{
128 if (bh) {
129 clear_buffer_dirty(bh);
130 clear_buffer_journal_test(bh);
131 }
132 return 0;
133}
134
135static struct reiserfs_bitmap_node *allocate_bitmap_node(struct super_block
136 *sb)
137{
138 struct reiserfs_bitmap_node *bn;
139 static int id;
140
141 bn = kmalloc(sizeof(struct reiserfs_bitmap_node), GFP_NOFS);
142 if (!bn) {
143 return NULL;
144 }
145 bn->data = kzalloc(sb->s_blocksize, GFP_NOFS);
146 if (!bn->data) {
147 kfree(bn);
148 return NULL;
149 }
150 bn->id = id++;
151 INIT_LIST_HEAD(&bn->list);
152 return bn;
153}
154
155static struct reiserfs_bitmap_node *get_bitmap_node(struct super_block *sb)
156{
157 struct reiserfs_journal *journal = SB_JOURNAL(sb);
158 struct reiserfs_bitmap_node *bn = NULL;
159 struct list_head *entry = journal->j_bitmap_nodes.next;
160
161 journal->j_used_bitmap_nodes++;
162repeat:
163
164 if (entry != &journal->j_bitmap_nodes) {
165 bn = list_entry(entry, struct reiserfs_bitmap_node, list);
166 list_del(entry);
167 memset(bn->data, 0, sb->s_blocksize);
168 journal->j_free_bitmap_nodes--;
169 return bn;
170 }
171 bn = allocate_bitmap_node(sb);
172 if (!bn) {
173 yield();
174 goto repeat;
175 }
176 return bn;
177}
178static inline void free_bitmap_node(struct super_block *sb,
179 struct reiserfs_bitmap_node *bn)
180{
181 struct reiserfs_journal *journal = SB_JOURNAL(sb);
182 journal->j_used_bitmap_nodes--;
183 if (journal->j_free_bitmap_nodes > REISERFS_MAX_BITMAP_NODES) {
184 kfree(bn->data);
185 kfree(bn);
186 } else {
187 list_add(&bn->list, &journal->j_bitmap_nodes);
188 journal->j_free_bitmap_nodes++;
189 }
190}
191
192static void allocate_bitmap_nodes(struct super_block *sb)
193{
194 int i;
195 struct reiserfs_journal *journal = SB_JOURNAL(sb);
196 struct reiserfs_bitmap_node *bn = NULL;
197 for (i = 0; i < REISERFS_MIN_BITMAP_NODES; i++) {
198 bn = allocate_bitmap_node(sb);
199 if (bn) {
200 list_add(&bn->list, &journal->j_bitmap_nodes);
201 journal->j_free_bitmap_nodes++;
202 } else {
203 /* this is ok, we'll try again when more are needed */
204 break;
205 }
206 }
207}
208
209static int set_bit_in_list_bitmap(struct super_block *sb,
210 b_blocknr_t block,
211 struct reiserfs_list_bitmap *jb)
212{
213 unsigned int bmap_nr = block / (sb->s_blocksize << 3);
214 unsigned int bit_nr = block % (sb->s_blocksize << 3);
215
216 if (!jb->bitmaps[bmap_nr]) {
217 jb->bitmaps[bmap_nr] = get_bitmap_node(sb);
218 }
219 set_bit(bit_nr, (unsigned long *)jb->bitmaps[bmap_nr]->data);
220 return 0;
221}
222
223static void cleanup_bitmap_list(struct super_block *sb,
224 struct reiserfs_list_bitmap *jb)
225{
226 int i;
227 if (jb->bitmaps == NULL)
228 return;
229
230 for (i = 0; i < reiserfs_bmap_count(sb); i++) {
231 if (jb->bitmaps[i]) {
232 free_bitmap_node(sb, jb->bitmaps[i]);
233 jb->bitmaps[i] = NULL;
234 }
235 }
236}
237
238/*
239 * only call this on FS unmount.
240 */
241static int free_list_bitmaps(struct super_block *sb,
242 struct reiserfs_list_bitmap *jb_array)
243{
244 int i;
245 struct reiserfs_list_bitmap *jb;
246 for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
247 jb = jb_array + i;
248 jb->journal_list = NULL;
249 cleanup_bitmap_list(sb, jb);
250 vfree(jb->bitmaps);
251 jb->bitmaps = NULL;
252 }
253 return 0;
254}
255
256static int free_bitmap_nodes(struct super_block *sb)
257{
258 struct reiserfs_journal *journal = SB_JOURNAL(sb);
259 struct list_head *next = journal->j_bitmap_nodes.next;
260 struct reiserfs_bitmap_node *bn;
261
262 while (next != &journal->j_bitmap_nodes) {
263 bn = list_entry(next, struct reiserfs_bitmap_node, list);
264 list_del(next);
265 kfree(bn->data);
266 kfree(bn);
267 next = journal->j_bitmap_nodes.next;
268 journal->j_free_bitmap_nodes--;
269 }
270
271 return 0;
272}
273
274/*
275 * get memory for JOURNAL_NUM_BITMAPS worth of bitmaps.
276 * jb_array is the array to be filled in.
277 */
278int reiserfs_allocate_list_bitmaps(struct super_block *sb,
279 struct reiserfs_list_bitmap *jb_array,
280 unsigned int bmap_nr)
281{
282 int i;
283 int failed = 0;
284 struct reiserfs_list_bitmap *jb;
285 int mem = bmap_nr * sizeof(struct reiserfs_bitmap_node *);
286
287 for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
288 jb = jb_array + i;
289 jb->journal_list = NULL;
290 jb->bitmaps = vzalloc(mem);
291 if (!jb->bitmaps) {
292 reiserfs_warning(sb, "clm-2000", "unable to "
293 "allocate bitmaps for journal lists");
294 failed = 1;
295 break;
296 }
297 }
298 if (failed) {
299 free_list_bitmaps(sb, jb_array);
300 return -1;
301 }
302 return 0;
303}
304
305/*
306 * find an available list bitmap. If you can't find one, flush a commit list
307 * and try again
308 */
309static struct reiserfs_list_bitmap *get_list_bitmap(struct super_block *sb,
310 struct reiserfs_journal_list
311 *jl)
312{
313 int i, j;
314 struct reiserfs_journal *journal = SB_JOURNAL(sb);
315 struct reiserfs_list_bitmap *jb = NULL;
316
317 for (j = 0; j < (JOURNAL_NUM_BITMAPS * 3); j++) {
318 i = journal->j_list_bitmap_index;
319 journal->j_list_bitmap_index = (i + 1) % JOURNAL_NUM_BITMAPS;
320 jb = journal->j_list_bitmap + i;
321 if (journal->j_list_bitmap[i].journal_list) {
322 flush_commit_list(sb,
323 journal->j_list_bitmap[i].
324 journal_list, 1);
325 if (!journal->j_list_bitmap[i].journal_list) {
326 break;
327 }
328 } else {
329 break;
330 }
331 }
332 /* double check to make sure if flushed correctly */
333 if (jb->journal_list)
334 return NULL;
335 jb->journal_list = jl;
336 return jb;
337}
338
339/*
340 * allocates a new chunk of X nodes, and links them all together as a list.
341 * Uses the cnode->next and cnode->prev pointers
342 * returns NULL on failure
343 */
344static struct reiserfs_journal_cnode *allocate_cnodes(int num_cnodes)
345{
346 struct reiserfs_journal_cnode *head;
347 int i;
348 if (num_cnodes <= 0) {
349 return NULL;
350 }
351 head = vzalloc(array_size(num_cnodes,
352 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_list_bitmap *jb;
465 int i;
466 unsigned long bl;
467
468 *next_zero_bit = 0; /* always start this at zero. */
469
470 PROC_INFO_INC(sb, journal.in_journal);
471 /*
472 * If we aren't doing a search_all, this is a metablock, and it
473 * will be logged before use. if we crash before the transaction
474 * that freed it commits, this transaction won't have committed
475 * either, and the block will never be written
476 */
477 if (search_all) {
478 for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
479 PROC_INFO_INC(sb, journal.in_journal_bitmap);
480 jb = journal->j_list_bitmap + i;
481 if (jb->journal_list && jb->bitmaps[bmap_nr] &&
482 test_bit(bit_nr,
483 (unsigned long *)jb->bitmaps[bmap_nr]->
484 data)) {
485 *next_zero_bit =
486 find_next_zero_bit((unsigned long *)
487 (jb->bitmaps[bmap_nr]->
488 data),
489 sb->s_blocksize << 3,
490 bit_nr + 1);
491 return 1;
492 }
493 }
494 }
495
496 bl = bmap_nr * (sb->s_blocksize << 3) + bit_nr;
497 /* is it in any old transactions? */
498 if (search_all
499 && (get_journal_hash_dev(sb, journal->j_list_hash_table, bl))) {
500 return 1;
501 }
502
503 /* is it in the current transaction. This should never happen */
504 if ((get_journal_hash_dev(sb, journal->j_hash_table, bl))) {
505 BUG();
506 return 1;
507 }
508
509 PROC_INFO_INC(sb, journal.in_journal_reusable);
510 /* safe for reuse */
511 return 0;
512}
513
514/* insert cn into table */
515static inline void insert_journal_hash(struct reiserfs_journal_cnode **table,
516 struct reiserfs_journal_cnode *cn)
517{
518 struct reiserfs_journal_cnode *cn_orig;
519
520 cn_orig = journal_hash(table, cn->sb, cn->blocknr);
521 cn->hnext = cn_orig;
522 cn->hprev = NULL;
523 if (cn_orig) {
524 cn_orig->hprev = cn;
525 }
526 journal_hash(table, cn->sb, cn->blocknr) = cn;
527}
528
529/* lock the current transaction */
530static inline void lock_journal(struct super_block *sb)
531{
532 PROC_INFO_INC(sb, journal.lock_journal);
533
534 reiserfs_mutex_lock_safe(&SB_JOURNAL(sb)->j_mutex, sb);
535}
536
537/* unlock the current transaction */
538static inline void unlock_journal(struct super_block *sb)
539{
540 mutex_unlock(&SB_JOURNAL(sb)->j_mutex);
541}
542
543static inline void get_journal_list(struct reiserfs_journal_list *jl)
544{
545 jl->j_refcount++;
546}
547
548static inline void put_journal_list(struct super_block *s,
549 struct reiserfs_journal_list *jl)
550{
551 if (jl->j_refcount < 1) {
552 reiserfs_panic(s, "journal-2", "trans id %u, refcount at %d",
553 jl->j_trans_id, jl->j_refcount);
554 }
555 if (--jl->j_refcount == 0)
556 kfree(jl);
557}
558
559/*
560 * this used to be much more involved, and I'm keeping it just in case
561 * things get ugly again. it gets called by flush_commit_list, and
562 * cleans up any data stored about blocks freed during a transaction.
563 */
564static void cleanup_freed_for_journal_list(struct super_block *sb,
565 struct reiserfs_journal_list *jl)
566{
567
568 struct reiserfs_list_bitmap *jb = jl->j_list_bitmap;
569 if (jb) {
570 cleanup_bitmap_list(sb, jb);
571 }
572 jl->j_list_bitmap->journal_list = NULL;
573 jl->j_list_bitmap = NULL;
574}
575
576static int journal_list_still_alive(struct super_block *s,
577 unsigned int trans_id)
578{
579 struct reiserfs_journal *journal = SB_JOURNAL(s);
580 struct list_head *entry = &journal->j_journal_list;
581 struct reiserfs_journal_list *jl;
582
583 if (!list_empty(entry)) {
584 jl = JOURNAL_LIST_ENTRY(entry->next);
585 if (jl->j_trans_id <= trans_id) {
586 return 1;
587 }
588 }
589 return 0;
590}
591
592/*
593 * If page->mapping was null, we failed to truncate this page for
594 * some reason. Most likely because it was truncated after being
595 * logged via data=journal.
596 *
597 * This does a check to see if the buffer belongs to one of these
598 * lost pages before doing the final put_bh. If page->mapping was
599 * null, it tries to free buffers on the page, which should make the
600 * final put_page drop the page from the lru.
601 */
602static void release_buffer_page(struct buffer_head *bh)
603{
604 struct folio *folio = page_folio(bh->b_page);
605 if (!folio->mapping && folio_trylock(folio)) {
606 folio_get(folio);
607 put_bh(bh);
608 if (!folio->mapping)
609 try_to_free_buffers(folio);
610 folio_unlock(folio);
611 folio_put(folio);
612 } else {
613 put_bh(bh);
614 }
615}
616
617static void reiserfs_end_buffer_io_sync(struct buffer_head *bh, int uptodate)
618{
619 if (buffer_journaled(bh)) {
620 reiserfs_warning(NULL, "clm-2084",
621 "pinned buffer %lu:%pg sent to disk",
622 bh->b_blocknr, bh->b_bdev);
623 }
624 if (uptodate)
625 set_buffer_uptodate(bh);
626 else
627 clear_buffer_uptodate(bh);
628
629 unlock_buffer(bh);
630 release_buffer_page(bh);
631}
632
633static void reiserfs_end_ordered_io(struct buffer_head *bh, int uptodate)
634{
635 if (uptodate)
636 set_buffer_uptodate(bh);
637 else
638 clear_buffer_uptodate(bh);
639 unlock_buffer(bh);
640 put_bh(bh);
641}
642
643static void submit_logged_buffer(struct buffer_head *bh)
644{
645 get_bh(bh);
646 bh->b_end_io = reiserfs_end_buffer_io_sync;
647 clear_buffer_journal_new(bh);
648 clear_buffer_dirty(bh);
649 if (!test_clear_buffer_journal_test(bh))
650 BUG();
651 if (!buffer_uptodate(bh))
652 BUG();
653 submit_bh(REQ_OP_WRITE, bh);
654}
655
656static void submit_ordered_buffer(struct buffer_head *bh)
657{
658 get_bh(bh);
659 bh->b_end_io = reiserfs_end_ordered_io;
660 clear_buffer_dirty(bh);
661 if (!buffer_uptodate(bh))
662 BUG();
663 submit_bh(REQ_OP_WRITE, bh);
664}
665
666#define CHUNK_SIZE 32
667struct buffer_chunk {
668 struct buffer_head *bh[CHUNK_SIZE];
669 int nr;
670};
671
672static void write_chunk(struct buffer_chunk *chunk)
673{
674 int i;
675 for (i = 0; i < chunk->nr; i++) {
676 submit_logged_buffer(chunk->bh[i]);
677 }
678 chunk->nr = 0;
679}
680
681static void write_ordered_chunk(struct buffer_chunk *chunk)
682{
683 int i;
684 for (i = 0; i < chunk->nr; i++) {
685 submit_ordered_buffer(chunk->bh[i]);
686 }
687 chunk->nr = 0;
688}
689
690static int add_to_chunk(struct buffer_chunk *chunk, struct buffer_head *bh,
691 spinlock_t * lock, void (fn) (struct buffer_chunk *))
692{
693 int ret = 0;
694 BUG_ON(chunk->nr >= CHUNK_SIZE);
695 chunk->bh[chunk->nr++] = bh;
696 if (chunk->nr >= CHUNK_SIZE) {
697 ret = 1;
698 if (lock) {
699 spin_unlock(lock);
700 fn(chunk);
701 spin_lock(lock);
702 } else {
703 fn(chunk);
704 }
705 }
706 return ret;
707}
708
709static atomic_t nr_reiserfs_jh = ATOMIC_INIT(0);
710static struct reiserfs_jh *alloc_jh(void)
711{
712 struct reiserfs_jh *jh;
713 while (1) {
714 jh = kmalloc(sizeof(*jh), GFP_NOFS);
715 if (jh) {
716 atomic_inc(&nr_reiserfs_jh);
717 return jh;
718 }
719 yield();
720 }
721}
722
723/*
724 * we want to free the jh when the buffer has been written
725 * and waited on
726 */
727void reiserfs_free_jh(struct buffer_head *bh)
728{
729 struct reiserfs_jh *jh;
730
731 jh = bh->b_private;
732 if (jh) {
733 bh->b_private = NULL;
734 jh->bh = NULL;
735 list_del_init(&jh->list);
736 kfree(jh);
737 if (atomic_read(&nr_reiserfs_jh) <= 0)
738 BUG();
739 atomic_dec(&nr_reiserfs_jh);
740 put_bh(bh);
741 }
742}
743
744static inline int __add_jh(struct reiserfs_journal *j, struct buffer_head *bh,
745 int tail)
746{
747 struct reiserfs_jh *jh;
748
749 if (bh->b_private) {
750 spin_lock(&j->j_dirty_buffers_lock);
751 if (!bh->b_private) {
752 spin_unlock(&j->j_dirty_buffers_lock);
753 goto no_jh;
754 }
755 jh = bh->b_private;
756 list_del_init(&jh->list);
757 } else {
758no_jh:
759 get_bh(bh);
760 jh = alloc_jh();
761 spin_lock(&j->j_dirty_buffers_lock);
762 /*
763 * buffer must be locked for __add_jh, should be able to have
764 * two adds at the same time
765 */
766 BUG_ON(bh->b_private);
767 jh->bh = bh;
768 bh->b_private = jh;
769 }
770 jh->jl = j->j_current_jl;
771 if (tail)
772 list_add_tail(&jh->list, &jh->jl->j_tail_bh_list);
773 else {
774 list_add_tail(&jh->list, &jh->jl->j_bh_list);
775 }
776 spin_unlock(&j->j_dirty_buffers_lock);
777 return 0;
778}
779
780int reiserfs_add_tail_list(struct inode *inode, struct buffer_head *bh)
781{
782 return __add_jh(SB_JOURNAL(inode->i_sb), bh, 1);
783}
784int reiserfs_add_ordered_list(struct inode *inode, struct buffer_head *bh)
785{
786 return __add_jh(SB_JOURNAL(inode->i_sb), bh, 0);
787}
788
789#define JH_ENTRY(l) list_entry((l), struct reiserfs_jh, list)
790static int write_ordered_buffers(spinlock_t * lock,
791 struct reiserfs_journal *j,
792 struct reiserfs_journal_list *jl,
793 struct list_head *list)
794{
795 struct buffer_head *bh;
796 struct reiserfs_jh *jh;
797 int ret = j->j_errno;
798 struct buffer_chunk chunk;
799 struct list_head tmp;
800 INIT_LIST_HEAD(&tmp);
801
802 chunk.nr = 0;
803 spin_lock(lock);
804 while (!list_empty(list)) {
805 jh = JH_ENTRY(list->next);
806 bh = jh->bh;
807 get_bh(bh);
808 if (!trylock_buffer(bh)) {
809 if (!buffer_dirty(bh)) {
810 list_move(&jh->list, &tmp);
811 goto loop_next;
812 }
813 spin_unlock(lock);
814 if (chunk.nr)
815 write_ordered_chunk(&chunk);
816 wait_on_buffer(bh);
817 cond_resched();
818 spin_lock(lock);
819 goto loop_next;
820 }
821 /*
822 * in theory, dirty non-uptodate buffers should never get here,
823 * but the upper layer io error paths still have a few quirks.
824 * Handle them here as gracefully as we can
825 */
826 if (!buffer_uptodate(bh) && buffer_dirty(bh)) {
827 clear_buffer_dirty(bh);
828 ret = -EIO;
829 }
830 if (buffer_dirty(bh)) {
831 list_move(&jh->list, &tmp);
832 add_to_chunk(&chunk, bh, lock, write_ordered_chunk);
833 } else {
834 reiserfs_free_jh(bh);
835 unlock_buffer(bh);
836 }
837loop_next:
838 put_bh(bh);
839 cond_resched_lock(lock);
840 }
841 if (chunk.nr) {
842 spin_unlock(lock);
843 write_ordered_chunk(&chunk);
844 spin_lock(lock);
845 }
846 while (!list_empty(&tmp)) {
847 jh = JH_ENTRY(tmp.prev);
848 bh = jh->bh;
849 get_bh(bh);
850 reiserfs_free_jh(bh);
851
852 if (buffer_locked(bh)) {
853 spin_unlock(lock);
854 wait_on_buffer(bh);
855 spin_lock(lock);
856 }
857 if (!buffer_uptodate(bh)) {
858 ret = -EIO;
859 }
860 /*
861 * ugly interaction with invalidate_folio here.
862 * reiserfs_invalidate_folio will pin any buffer that has a
863 * valid journal head from an older transaction. If someone
864 * else sets our buffer dirty after we write it in the first
865 * loop, and then someone truncates the page away, nobody
866 * will ever write the buffer. We're safe if we write the
867 * page one last time after freeing the journal header.
868 */
869 if (buffer_dirty(bh) && unlikely(bh->b_page->mapping == NULL)) {
870 spin_unlock(lock);
871 write_dirty_buffer(bh, 0);
872 spin_lock(lock);
873 }
874 put_bh(bh);
875 cond_resched_lock(lock);
876 }
877 spin_unlock(lock);
878 return ret;
879}
880
881static int flush_older_commits(struct super_block *s,
882 struct reiserfs_journal_list *jl)
883{
884 struct reiserfs_journal *journal = SB_JOURNAL(s);
885 struct reiserfs_journal_list *other_jl;
886 struct reiserfs_journal_list *first_jl;
887 struct list_head *entry;
888 unsigned int trans_id = jl->j_trans_id;
889 unsigned int other_trans_id;
890
891find_first:
892 /*
893 * first we walk backwards to find the oldest uncommitted transation
894 */
895 first_jl = jl;
896 entry = jl->j_list.prev;
897 while (1) {
898 other_jl = JOURNAL_LIST_ENTRY(entry);
899 if (entry == &journal->j_journal_list ||
900 atomic_read(&other_jl->j_older_commits_done))
901 break;
902
903 first_jl = other_jl;
904 entry = other_jl->j_list.prev;
905 }
906
907 /* if we didn't find any older uncommitted transactions, return now */
908 if (first_jl == jl) {
909 return 0;
910 }
911
912 entry = &first_jl->j_list;
913 while (1) {
914 other_jl = JOURNAL_LIST_ENTRY(entry);
915 other_trans_id = other_jl->j_trans_id;
916
917 if (other_trans_id < trans_id) {
918 if (atomic_read(&other_jl->j_commit_left) != 0) {
919 flush_commit_list(s, other_jl, 0);
920
921 /* list we were called with is gone, return */
922 if (!journal_list_still_alive(s, trans_id))
923 return 1;
924
925 /*
926 * the one we just flushed is gone, this means
927 * all older lists are also gone, so first_jl
928 * is no longer valid either. Go back to the
929 * beginning.
930 */
931 if (!journal_list_still_alive
932 (s, other_trans_id)) {
933 goto find_first;
934 }
935 }
936 entry = entry->next;
937 if (entry == &journal->j_journal_list)
938 return 0;
939 } else {
940 return 0;
941 }
942 }
943 return 0;
944}
945
946static int reiserfs_async_progress_wait(struct super_block *s)
947{
948 struct reiserfs_journal *j = SB_JOURNAL(s);
949
950 if (atomic_read(&j->j_async_throttle)) {
951 int depth;
952
953 depth = reiserfs_write_unlock_nested(s);
954 wait_var_event_timeout(&j->j_async_throttle,
955 atomic_read(&j->j_async_throttle) == 0,
956 HZ / 10);
957 reiserfs_write_lock_nested(s, depth);
958 }
959
960 return 0;
961}
962
963/*
964 * if this journal list still has commit blocks unflushed, send them to disk.
965 *
966 * log areas must be flushed in order (transaction 2 can't commit before
967 * transaction 1) Before the commit block can by written, every other log
968 * block must be safely on disk
969 */
970static int flush_commit_list(struct super_block *s,
971 struct reiserfs_journal_list *jl, int flushall)
972{
973 int i;
974 b_blocknr_t bn;
975 struct buffer_head *tbh = NULL;
976 unsigned int trans_id = jl->j_trans_id;
977 struct reiserfs_journal *journal = SB_JOURNAL(s);
978 int retval = 0;
979 int write_len;
980 int depth;
981
982 reiserfs_check_lock_depth(s, "flush_commit_list");
983
984 if (atomic_read(&jl->j_older_commits_done)) {
985 return 0;
986 }
987
988 /*
989 * before we can put our commit blocks on disk, we have to make
990 * sure everyone older than us is on disk too
991 */
992 BUG_ON(jl->j_len <= 0);
993 BUG_ON(trans_id == journal->j_trans_id);
994
995 get_journal_list(jl);
996 if (flushall) {
997 if (flush_older_commits(s, jl) == 1) {
998 /*
999 * list disappeared during flush_older_commits.
1000 * return
1001 */
1002 goto put_jl;
1003 }
1004 }
1005
1006 /* make sure nobody is trying to flush this one at the same time */
1007 reiserfs_mutex_lock_safe(&jl->j_commit_mutex, s);
1008
1009 if (!journal_list_still_alive(s, trans_id)) {
1010 mutex_unlock(&jl->j_commit_mutex);
1011 goto put_jl;
1012 }
1013 BUG_ON(jl->j_trans_id == 0);
1014
1015 /* this commit is done, exit */
1016 if (atomic_read(&jl->j_commit_left) <= 0) {
1017 if (flushall) {
1018 atomic_set(&jl->j_older_commits_done, 1);
1019 }
1020 mutex_unlock(&jl->j_commit_mutex);
1021 goto put_jl;
1022 }
1023
1024 if (!list_empty(&jl->j_bh_list)) {
1025 int ret;
1026
1027 /*
1028 * We might sleep in numerous places inside
1029 * write_ordered_buffers. Relax the write lock.
1030 */
1031 depth = reiserfs_write_unlock_nested(s);
1032 ret = write_ordered_buffers(&journal->j_dirty_buffers_lock,
1033 journal, jl, &jl->j_bh_list);
1034 if (ret < 0 && retval == 0)
1035 retval = ret;
1036 reiserfs_write_lock_nested(s, depth);
1037 }
1038 BUG_ON(!list_empty(&jl->j_bh_list));
1039 /*
1040 * for the description block and all the log blocks, submit any buffers
1041 * that haven't already reached the disk. Try to write at least 256
1042 * log blocks. later on, we will only wait on blocks that correspond
1043 * to this transaction, but while we're unplugging we might as well
1044 * get a chunk of data on there.
1045 */
1046 atomic_inc(&journal->j_async_throttle);
1047 write_len = jl->j_len + 1;
1048 if (write_len < 256)
1049 write_len = 256;
1050 for (i = 0 ; i < write_len ; i++) {
1051 bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) + (jl->j_start + i) %
1052 SB_ONDISK_JOURNAL_SIZE(s);
1053 tbh = journal_find_get_block(s, bn);
1054 if (tbh) {
1055 if (buffer_dirty(tbh)) {
1056 depth = reiserfs_write_unlock_nested(s);
1057 write_dirty_buffer(tbh, 0);
1058 reiserfs_write_lock_nested(s, depth);
1059 }
1060 put_bh(tbh) ;
1061 }
1062 }
1063 if (atomic_dec_and_test(&journal->j_async_throttle))
1064 wake_up_var(&journal->j_async_throttle);
1065
1066 for (i = 0; i < (jl->j_len + 1); i++) {
1067 bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) +
1068 (jl->j_start + i) % SB_ONDISK_JOURNAL_SIZE(s);
1069 tbh = journal_find_get_block(s, bn);
1070
1071 depth = reiserfs_write_unlock_nested(s);
1072 __wait_on_buffer(tbh);
1073 reiserfs_write_lock_nested(s, depth);
1074 /*
1075 * since we're using ll_rw_blk above, it might have skipped
1076 * over a locked buffer. Double check here
1077 */
1078 /* redundant, sync_dirty_buffer() checks */
1079 if (buffer_dirty(tbh)) {
1080 depth = reiserfs_write_unlock_nested(s);
1081 sync_dirty_buffer(tbh);
1082 reiserfs_write_lock_nested(s, depth);
1083 }
1084 if (unlikely(!buffer_uptodate(tbh))) {
1085#ifdef CONFIG_REISERFS_CHECK
1086 reiserfs_warning(s, "journal-601",
1087 "buffer write failed");
1088#endif
1089 retval = -EIO;
1090 }
1091 /* once for journal_find_get_block */
1092 put_bh(tbh);
1093 /* once due to original getblk in do_journal_end */
1094 put_bh(tbh);
1095 atomic_dec(&jl->j_commit_left);
1096 }
1097
1098 BUG_ON(atomic_read(&jl->j_commit_left) != 1);
1099
1100 /*
1101 * If there was a write error in the journal - we can't commit
1102 * this transaction - it will be invalid and, if successful,
1103 * will just end up propagating the write error out to
1104 * the file system.
1105 */
1106 if (likely(!retval && !reiserfs_is_journal_aborted (journal))) {
1107 if (buffer_dirty(jl->j_commit_bh))
1108 BUG();
1109 mark_buffer_dirty(jl->j_commit_bh) ;
1110 depth = reiserfs_write_unlock_nested(s);
1111 if (reiserfs_barrier_flush(s))
1112 __sync_dirty_buffer(jl->j_commit_bh,
1113 REQ_SYNC | REQ_PREFLUSH | REQ_FUA);
1114 else
1115 sync_dirty_buffer(jl->j_commit_bh);
1116 reiserfs_write_lock_nested(s, depth);
1117 }
1118
1119 /*
1120 * If there was a write error in the journal - we can't commit this
1121 * transaction - it will be invalid and, if successful, will just end
1122 * up propagating the write error out to the filesystem.
1123 */
1124 if (unlikely(!buffer_uptodate(jl->j_commit_bh))) {
1125#ifdef CONFIG_REISERFS_CHECK
1126 reiserfs_warning(s, "journal-615", "buffer write failed");
1127#endif
1128 retval = -EIO;
1129 }
1130 bforget(jl->j_commit_bh);
1131 if (journal->j_last_commit_id != 0 &&
1132 (jl->j_trans_id - journal->j_last_commit_id) != 1) {
1133 reiserfs_warning(s, "clm-2200", "last commit %lu, current %lu",
1134 journal->j_last_commit_id, jl->j_trans_id);
1135 }
1136 journal->j_last_commit_id = jl->j_trans_id;
1137
1138 /*
1139 * now, every commit block is on the disk. It is safe to allow
1140 * blocks freed during this transaction to be reallocated
1141 */
1142 cleanup_freed_for_journal_list(s, jl);
1143
1144 retval = retval ? retval : journal->j_errno;
1145
1146 /* mark the metadata dirty */
1147 if (!retval)
1148 dirty_one_transaction(s, jl);
1149 atomic_dec(&jl->j_commit_left);
1150
1151 if (flushall) {
1152 atomic_set(&jl->j_older_commits_done, 1);
1153 }
1154 mutex_unlock(&jl->j_commit_mutex);
1155put_jl:
1156 put_journal_list(s, jl);
1157
1158 if (retval)
1159 reiserfs_abort(s, retval, "Journal write error in %s",
1160 __func__);
1161 return retval;
1162}
1163
1164/*
1165 * flush_journal_list frequently needs to find a newer transaction for a
1166 * given block. This does that, or returns NULL if it can't find anything
1167 */
1168static struct reiserfs_journal_list *find_newer_jl_for_cn(struct
1169 reiserfs_journal_cnode
1170 *cn)
1171{
1172 struct super_block *sb = cn->sb;
1173 b_blocknr_t blocknr = cn->blocknr;
1174
1175 cn = cn->hprev;
1176 while (cn) {
1177 if (cn->sb == sb && cn->blocknr == blocknr && cn->jlist) {
1178 return cn->jlist;
1179 }
1180 cn = cn->hprev;
1181 }
1182 return NULL;
1183}
1184
1185static void remove_journal_hash(struct super_block *,
1186 struct reiserfs_journal_cnode **,
1187 struct reiserfs_journal_list *, unsigned long,
1188 int);
1189
1190/*
1191 * once all the real blocks have been flushed, it is safe to remove them
1192 * from the journal list for this transaction. Aside from freeing the
1193 * cnode, this also allows the block to be reallocated for data blocks
1194 * if it had been deleted.
1195 */
1196static void remove_all_from_journal_list(struct super_block *sb,
1197 struct reiserfs_journal_list *jl,
1198 int debug)
1199{
1200 struct reiserfs_journal *journal = SB_JOURNAL(sb);
1201 struct reiserfs_journal_cnode *cn, *last;
1202 cn = jl->j_realblock;
1203
1204 /*
1205 * which is better, to lock once around the whole loop, or
1206 * to lock for each call to remove_journal_hash?
1207 */
1208 while (cn) {
1209 if (cn->blocknr != 0) {
1210 if (debug) {
1211 reiserfs_warning(sb, "reiserfs-2201",
1212 "block %u, bh is %d, state %ld",
1213 cn->blocknr, cn->bh ? 1 : 0,
1214 cn->state);
1215 }
1216 cn->state = 0;
1217 remove_journal_hash(sb, journal->j_list_hash_table,
1218 jl, cn->blocknr, 1);
1219 }
1220 last = cn;
1221 cn = cn->next;
1222 free_cnode(sb, last);
1223 }
1224 jl->j_realblock = NULL;
1225}
1226
1227/*
1228 * if this timestamp is greater than the timestamp we wrote last to the
1229 * header block, write it to the header block. once this is done, I can
1230 * safely say the log area for this transaction won't ever be replayed,
1231 * and I can start releasing blocks in this transaction for reuse as data
1232 * blocks. called by flush_journal_list, before it calls
1233 * remove_all_from_journal_list
1234 */
1235static int _update_journal_header_block(struct super_block *sb,
1236 unsigned long offset,
1237 unsigned int trans_id)
1238{
1239 struct reiserfs_journal_header *jh;
1240 struct reiserfs_journal *journal = SB_JOURNAL(sb);
1241 int depth;
1242
1243 if (reiserfs_is_journal_aborted(journal))
1244 return -EIO;
1245
1246 if (trans_id >= journal->j_last_flush_trans_id) {
1247 if (buffer_locked((journal->j_header_bh))) {
1248 depth = reiserfs_write_unlock_nested(sb);
1249 __wait_on_buffer(journal->j_header_bh);
1250 reiserfs_write_lock_nested(sb, depth);
1251 if (unlikely(!buffer_uptodate(journal->j_header_bh))) {
1252#ifdef CONFIG_REISERFS_CHECK
1253 reiserfs_warning(sb, "journal-699",
1254 "buffer write failed");
1255#endif
1256 return -EIO;
1257 }
1258 }
1259 journal->j_last_flush_trans_id = trans_id;
1260 journal->j_first_unflushed_offset = offset;
1261 jh = (struct reiserfs_journal_header *)(journal->j_header_bh->
1262 b_data);
1263 jh->j_last_flush_trans_id = cpu_to_le32(trans_id);
1264 jh->j_first_unflushed_offset = cpu_to_le32(offset);
1265 jh->j_mount_id = cpu_to_le32(journal->j_mount_id);
1266
1267 set_buffer_dirty(journal->j_header_bh);
1268 depth = reiserfs_write_unlock_nested(sb);
1269
1270 if (reiserfs_barrier_flush(sb))
1271 __sync_dirty_buffer(journal->j_header_bh,
1272 REQ_SYNC | REQ_PREFLUSH | REQ_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;
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 transaction",
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 cn = cn->next;
1509 if (saved_bh) {
1510 /*
1511 * we incremented this to keep others from
1512 * taking the buffer head away
1513 */
1514 put_bh(saved_bh);
1515 if (atomic_read(&saved_bh->b_count) < 0) {
1516 reiserfs_warning(s, "journal-945",
1517 "saved_bh->b_count < 0");
1518 }
1519 }
1520 }
1521 if (count > 0) {
1522 cn = jl->j_realblock;
1523 while (cn) {
1524 if (test_bit(BLOCK_NEEDS_FLUSH, &cn->state)) {
1525 if (!cn->bh) {
1526 reiserfs_panic(s, "journal-1011",
1527 "cn->bh is NULL");
1528 }
1529
1530 depth = reiserfs_write_unlock_nested(s);
1531 __wait_on_buffer(cn->bh);
1532 reiserfs_write_lock_nested(s, depth);
1533
1534 if (!cn->bh) {
1535 reiserfs_panic(s, "journal-1012",
1536 "cn->bh is NULL");
1537 }
1538 if (unlikely(!buffer_uptodate(cn->bh))) {
1539#ifdef CONFIG_REISERFS_CHECK
1540 reiserfs_warning(s, "journal-949",
1541 "buffer write failed");
1542#endif
1543 err = -EIO;
1544 }
1545 /*
1546 * note, we must clear the JDirty_wait bit
1547 * after the up to date check, otherwise we
1548 * race against our flushpage routine
1549 */
1550 BUG_ON(!test_clear_buffer_journal_dirty
1551 (cn->bh));
1552
1553 /* drop one ref for us */
1554 put_bh(cn->bh);
1555 /* drop one ref for journal_mark_dirty */
1556 release_buffer_page(cn->bh);
1557 }
1558 cn = cn->next;
1559 }
1560 }
1561
1562 if (err)
1563 reiserfs_abort(s, -EIO,
1564 "Write error while pushing transaction to disk in %s",
1565 __func__);
1566flush_older_and_return:
1567
1568 /*
1569 * before we can update the journal header block, we _must_ flush all
1570 * real blocks from all older transactions to disk. This is because
1571 * once the header block is updated, this transaction will not be
1572 * replayed after a crash
1573 */
1574 if (flushall) {
1575 flush_older_journal_lists(s, jl);
1576 }
1577
1578 err = journal->j_errno;
1579 /*
1580 * before we can remove everything from the hash tables for this
1581 * transaction, we must make sure it can never be replayed
1582 *
1583 * since we are only called from do_journal_end, we know for sure there
1584 * are no allocations going on while we are flushing journal lists. So,
1585 * we only need to update the journal header block for the last list
1586 * being flushed
1587 */
1588 if (!err && flushall) {
1589 err =
1590 update_journal_header_block(s,
1591 (jl->j_start + jl->j_len +
1592 2) % SB_ONDISK_JOURNAL_SIZE(s),
1593 jl->j_trans_id);
1594 if (err)
1595 reiserfs_abort(s, -EIO,
1596 "Write error while updating journal header in %s",
1597 __func__);
1598 }
1599 remove_all_from_journal_list(s, jl, 0);
1600 list_del_init(&jl->j_list);
1601 journal->j_num_lists--;
1602 del_from_work_list(s, jl);
1603
1604 if (journal->j_last_flush_id != 0 &&
1605 (jl->j_trans_id - journal->j_last_flush_id) != 1) {
1606 reiserfs_warning(s, "clm-2201", "last flush %lu, current %lu",
1607 journal->j_last_flush_id, jl->j_trans_id);
1608 }
1609 journal->j_last_flush_id = jl->j_trans_id;
1610
1611 /*
1612 * not strictly required since we are freeing the list, but it should
1613 * help find code using dead lists later on
1614 */
1615 jl->j_len = 0;
1616 atomic_set(&jl->j_nonzerolen, 0);
1617 jl->j_start = 0;
1618 jl->j_realblock = NULL;
1619 jl->j_commit_bh = NULL;
1620 jl->j_trans_id = 0;
1621 jl->j_state = 0;
1622 put_journal_list(s, jl);
1623 if (flushall)
1624 mutex_unlock(&journal->j_flush_mutex);
1625 return err;
1626}
1627
1628static int write_one_transaction(struct super_block *s,
1629 struct reiserfs_journal_list *jl,
1630 struct buffer_chunk *chunk)
1631{
1632 struct reiserfs_journal_cnode *cn;
1633 int ret = 0;
1634
1635 jl->j_state |= LIST_TOUCHED;
1636 del_from_work_list(s, jl);
1637 if (jl->j_len == 0 || atomic_read(&jl->j_nonzerolen) == 0) {
1638 return 0;
1639 }
1640
1641 cn = jl->j_realblock;
1642 while (cn) {
1643 /*
1644 * if the blocknr == 0, this has been cleared from the hash,
1645 * skip it
1646 */
1647 if (cn->blocknr == 0) {
1648 goto next;
1649 }
1650 if (cn->bh && can_dirty(cn) && buffer_dirty(cn->bh)) {
1651 struct buffer_head *tmp_bh;
1652 /*
1653 * we can race against journal_mark_freed when we try
1654 * to lock_buffer(cn->bh), so we have to inc the buffer
1655 * count, and recheck things after locking
1656 */
1657 tmp_bh = cn->bh;
1658 get_bh(tmp_bh);
1659 lock_buffer(tmp_bh);
1660 if (cn->bh && can_dirty(cn) && buffer_dirty(tmp_bh)) {
1661 if (!buffer_journal_dirty(tmp_bh) ||
1662 buffer_journal_prepared(tmp_bh))
1663 BUG();
1664 add_to_chunk(chunk, tmp_bh, NULL, write_chunk);
1665 ret++;
1666 } else {
1667 /* note, cn->bh might be null now */
1668 unlock_buffer(tmp_bh);
1669 }
1670 put_bh(tmp_bh);
1671 }
1672next:
1673 cn = cn->next;
1674 cond_resched();
1675 }
1676 return ret;
1677}
1678
1679/* used by flush_commit_list */
1680static void dirty_one_transaction(struct super_block *s,
1681 struct reiserfs_journal_list *jl)
1682{
1683 struct reiserfs_journal_cnode *cn;
1684 struct reiserfs_journal_list *pjl;
1685
1686 jl->j_state |= LIST_DIRTY;
1687 cn = jl->j_realblock;
1688 while (cn) {
1689 /*
1690 * look for a more recent transaction that logged this
1691 * buffer. Only the most recent transaction with a buffer in
1692 * it is allowed to send that buffer to disk
1693 */
1694 pjl = find_newer_jl_for_cn(cn);
1695 if (!pjl && cn->blocknr && cn->bh
1696 && buffer_journal_dirty(cn->bh)) {
1697 BUG_ON(!can_dirty(cn));
1698 /*
1699 * if the buffer is prepared, it will either be logged
1700 * or restored. If restored, we need to make sure
1701 * it actually gets marked dirty
1702 */
1703 clear_buffer_journal_new(cn->bh);
1704 if (buffer_journal_prepared(cn->bh)) {
1705 set_buffer_journal_restore_dirty(cn->bh);
1706 } else {
1707 set_buffer_journal_test(cn->bh);
1708 mark_buffer_dirty(cn->bh);
1709 }
1710 }
1711 cn = cn->next;
1712 }
1713}
1714
1715static int kupdate_transactions(struct super_block *s,
1716 struct reiserfs_journal_list *jl,
1717 struct reiserfs_journal_list **next_jl,
1718 unsigned int *next_trans_id,
1719 int num_blocks, int num_trans)
1720{
1721 int ret = 0;
1722 int written = 0;
1723 int transactions_flushed = 0;
1724 unsigned int orig_trans_id = jl->j_trans_id;
1725 struct buffer_chunk chunk;
1726 struct list_head *entry;
1727 struct reiserfs_journal *journal = SB_JOURNAL(s);
1728 chunk.nr = 0;
1729
1730 reiserfs_mutex_lock_safe(&journal->j_flush_mutex, s);
1731 if (!journal_list_still_alive(s, orig_trans_id)) {
1732 goto done;
1733 }
1734
1735 /*
1736 * we've got j_flush_mutex held, nobody is going to delete any
1737 * of these lists out from underneath us
1738 */
1739 while ((num_trans && transactions_flushed < num_trans) ||
1740 (!num_trans && written < num_blocks)) {
1741
1742 if (jl->j_len == 0 || (jl->j_state & LIST_TOUCHED) ||
1743 atomic_read(&jl->j_commit_left)
1744 || !(jl->j_state & LIST_DIRTY)) {
1745 del_from_work_list(s, jl);
1746 break;
1747 }
1748 ret = write_one_transaction(s, jl, &chunk);
1749
1750 if (ret < 0)
1751 goto done;
1752 transactions_flushed++;
1753 written += ret;
1754 entry = jl->j_list.next;
1755
1756 /* did we wrap? */
1757 if (entry == &journal->j_journal_list) {
1758 break;
1759 }
1760 jl = JOURNAL_LIST_ENTRY(entry);
1761
1762 /* don't bother with older transactions */
1763 if (jl->j_trans_id <= orig_trans_id)
1764 break;
1765 }
1766 if (chunk.nr) {
1767 write_chunk(&chunk);
1768 }
1769
1770done:
1771 mutex_unlock(&journal->j_flush_mutex);
1772 return ret;
1773}
1774
1775/*
1776 * for o_sync and fsync heavy applications, they tend to use
1777 * all the journa list slots with tiny transactions. These
1778 * trigger lots and lots of calls to update the header block, which
1779 * adds seeks and slows things down.
1780 *
1781 * This function tries to clear out a large chunk of the journal lists
1782 * at once, which makes everything faster since only the newest journal
1783 * list updates the header block
1784 */
1785static int flush_used_journal_lists(struct super_block *s,
1786 struct reiserfs_journal_list *jl)
1787{
1788 unsigned long len = 0;
1789 unsigned long cur_len;
1790 int i;
1791 int limit = 256;
1792 struct reiserfs_journal_list *tjl;
1793 struct reiserfs_journal_list *flush_jl;
1794 unsigned int trans_id;
1795 struct reiserfs_journal *journal = SB_JOURNAL(s);
1796
1797 flush_jl = tjl = jl;
1798
1799 /* in data logging mode, try harder to flush a lot of blocks */
1800 if (reiserfs_data_log(s))
1801 limit = 1024;
1802 /* flush for 256 transactions or limit blocks, whichever comes first */
1803 for (i = 0; i < 256 && len < limit; i++) {
1804 if (atomic_read(&tjl->j_commit_left) ||
1805 tjl->j_trans_id < jl->j_trans_id) {
1806 break;
1807 }
1808 cur_len = atomic_read(&tjl->j_nonzerolen);
1809 if (cur_len > 0) {
1810 tjl->j_state &= ~LIST_TOUCHED;
1811 }
1812 len += cur_len;
1813 flush_jl = tjl;
1814 if (tjl->j_list.next == &journal->j_journal_list)
1815 break;
1816 tjl = JOURNAL_LIST_ENTRY(tjl->j_list.next);
1817 }
1818 get_journal_list(jl);
1819 get_journal_list(flush_jl);
1820
1821 /*
1822 * try to find a group of blocks we can flush across all the
1823 * transactions, but only bother if we've actually spanned
1824 * across multiple lists
1825 */
1826 if (flush_jl != jl)
1827 kupdate_transactions(s, jl, &tjl, &trans_id, len, i);
1828
1829 flush_journal_list(s, flush_jl, 1);
1830 put_journal_list(s, flush_jl);
1831 put_journal_list(s, jl);
1832 return 0;
1833}
1834
1835/*
1836 * removes any nodes in table with name block and dev as bh.
1837 * only touchs the hnext and hprev pointers.
1838 */
1839static void remove_journal_hash(struct super_block *sb,
1840 struct reiserfs_journal_cnode **table,
1841 struct reiserfs_journal_list *jl,
1842 unsigned long block, int remove_freed)
1843{
1844 struct reiserfs_journal_cnode *cur;
1845 struct reiserfs_journal_cnode **head;
1846
1847 head = &(journal_hash(table, sb, block));
1848 if (!head) {
1849 return;
1850 }
1851 cur = *head;
1852 while (cur) {
1853 if (cur->blocknr == block && cur->sb == sb
1854 && (jl == NULL || jl == cur->jlist)
1855 && (!test_bit(BLOCK_FREED, &cur->state) || remove_freed)) {
1856 if (cur->hnext) {
1857 cur->hnext->hprev = cur->hprev;
1858 }
1859 if (cur->hprev) {
1860 cur->hprev->hnext = cur->hnext;
1861 } else {
1862 *head = cur->hnext;
1863 }
1864 cur->blocknr = 0;
1865 cur->sb = NULL;
1866 cur->state = 0;
1867 /*
1868 * anybody who clears the cur->bh will also
1869 * dec the nonzerolen
1870 */
1871 if (cur->bh && cur->jlist)
1872 atomic_dec(&cur->jlist->j_nonzerolen);
1873 cur->bh = NULL;
1874 cur->jlist = NULL;
1875 }
1876 cur = cur->hnext;
1877 }
1878}
1879
1880static void free_journal_ram(struct super_block *sb)
1881{
1882 struct reiserfs_journal *journal = SB_JOURNAL(sb);
1883 kfree(journal->j_current_jl);
1884 journal->j_num_lists--;
1885
1886 vfree(journal->j_cnode_free_orig);
1887 free_list_bitmaps(sb, journal->j_list_bitmap);
1888 free_bitmap_nodes(sb); /* must be after free_list_bitmaps */
1889 if (journal->j_header_bh) {
1890 brelse(journal->j_header_bh);
1891 }
1892 /*
1893 * j_header_bh is on the journal dev, make sure
1894 * not to release the journal dev until we brelse j_header_bh
1895 */
1896 release_journal_dev(sb, journal);
1897 vfree(journal);
1898}
1899
1900/*
1901 * call on unmount. Only set error to 1 if you haven't made your way out
1902 * of read_super() yet. Any other caller must keep error at 0.
1903 */
1904static int do_journal_release(struct reiserfs_transaction_handle *th,
1905 struct super_block *sb, int error)
1906{
1907 struct reiserfs_transaction_handle myth;
1908 struct reiserfs_journal *journal = SB_JOURNAL(sb);
1909
1910 /*
1911 * we only want to flush out transactions if we were
1912 * called with error == 0
1913 */
1914 if (!error && !sb_rdonly(sb)) {
1915 /* end the current trans */
1916 BUG_ON(!th->t_trans_id);
1917 do_journal_end(th, FLUSH_ALL);
1918
1919 /*
1920 * make sure something gets logged to force
1921 * our way into the flush code
1922 */
1923 if (!journal_join(&myth, sb)) {
1924 reiserfs_prepare_for_journal(sb,
1925 SB_BUFFER_WITH_SB(sb),
1926 1);
1927 journal_mark_dirty(&myth, SB_BUFFER_WITH_SB(sb));
1928 do_journal_end(&myth, FLUSH_ALL);
1929 }
1930 }
1931
1932 /* this also catches errors during the do_journal_end above */
1933 if (!error && reiserfs_is_journal_aborted(journal)) {
1934 memset(&myth, 0, sizeof(myth));
1935 if (!journal_join_abort(&myth, sb)) {
1936 reiserfs_prepare_for_journal(sb,
1937 SB_BUFFER_WITH_SB(sb),
1938 1);
1939 journal_mark_dirty(&myth, SB_BUFFER_WITH_SB(sb));
1940 do_journal_end(&myth, FLUSH_ALL);
1941 }
1942 }
1943
1944
1945 /*
1946 * We must release the write lock here because
1947 * the workqueue job (flush_async_commit) needs this lock
1948 */
1949 reiserfs_write_unlock(sb);
1950
1951 /*
1952 * Cancel flushing of old commits. Note that neither of these works
1953 * will be requeued because superblock is being shutdown and doesn't
1954 * have SB_ACTIVE set.
1955 */
1956 reiserfs_cancel_old_flush(sb);
1957 /* wait for all commits to finish */
1958 cancel_delayed_work_sync(&SB_JOURNAL(sb)->j_work);
1959
1960 free_journal_ram(sb);
1961
1962 reiserfs_write_lock(sb);
1963
1964 return 0;
1965}
1966
1967/* * call on unmount. flush all journal trans, release all alloc'd ram */
1968int journal_release(struct reiserfs_transaction_handle *th,
1969 struct super_block *sb)
1970{
1971 return do_journal_release(th, sb, 0);
1972}
1973
1974/* only call from an error condition inside reiserfs_read_super! */
1975int journal_release_error(struct reiserfs_transaction_handle *th,
1976 struct super_block *sb)
1977{
1978 return do_journal_release(th, sb, 1);
1979}
1980
1981/*
1982 * compares description block with commit block.
1983 * returns 1 if they differ, 0 if they are the same
1984 */
1985static int journal_compare_desc_commit(struct super_block *sb,
1986 struct reiserfs_journal_desc *desc,
1987 struct reiserfs_journal_commit *commit)
1988{
1989 if (get_commit_trans_id(commit) != get_desc_trans_id(desc) ||
1990 get_commit_trans_len(commit) != get_desc_trans_len(desc) ||
1991 get_commit_trans_len(commit) > SB_JOURNAL(sb)->j_trans_max ||
1992 get_commit_trans_len(commit) <= 0) {
1993 return 1;
1994 }
1995 return 0;
1996}
1997
1998/*
1999 * returns 0 if it did not find a description block
2000 * returns -1 if it found a corrupt commit block
2001 * returns 1 if both desc and commit were valid
2002 * NOTE: only called during fs mount
2003 */
2004static int journal_transaction_is_valid(struct super_block *sb,
2005 struct buffer_head *d_bh,
2006 unsigned int *oldest_invalid_trans_id,
2007 unsigned long *newest_mount_id)
2008{
2009 struct reiserfs_journal_desc *desc;
2010 struct reiserfs_journal_commit *commit;
2011 struct buffer_head *c_bh;
2012 unsigned long offset;
2013
2014 if (!d_bh)
2015 return 0;
2016
2017 desc = (struct reiserfs_journal_desc *)d_bh->b_data;
2018 if (get_desc_trans_len(desc) > 0
2019 && !memcmp(get_journal_desc_magic(d_bh), JOURNAL_DESC_MAGIC, 8)) {
2020 if (oldest_invalid_trans_id && *oldest_invalid_trans_id
2021 && get_desc_trans_id(desc) > *oldest_invalid_trans_id) {
2022 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2023 "journal-986: transaction "
2024 "is valid returning because trans_id %d is greater than "
2025 "oldest_invalid %lu",
2026 get_desc_trans_id(desc),
2027 *oldest_invalid_trans_id);
2028 return 0;
2029 }
2030 if (newest_mount_id
2031 && *newest_mount_id > get_desc_mount_id(desc)) {
2032 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2033 "journal-1087: transaction "
2034 "is valid returning because mount_id %d is less than "
2035 "newest_mount_id %lu",
2036 get_desc_mount_id(desc),
2037 *newest_mount_id);
2038 return -1;
2039 }
2040 if (get_desc_trans_len(desc) > SB_JOURNAL(sb)->j_trans_max) {
2041 reiserfs_warning(sb, "journal-2018",
2042 "Bad transaction length %d "
2043 "encountered, ignoring transaction",
2044 get_desc_trans_len(desc));
2045 return -1;
2046 }
2047 offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2048
2049 /*
2050 * ok, we have a journal description block,
2051 * let's see if the transaction was valid
2052 */
2053 c_bh =
2054 journal_bread(sb,
2055 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2056 ((offset + get_desc_trans_len(desc) +
2057 1) % SB_ONDISK_JOURNAL_SIZE(sb)));
2058 if (!c_bh)
2059 return 0;
2060 commit = (struct reiserfs_journal_commit *)c_bh->b_data;
2061 if (journal_compare_desc_commit(sb, desc, commit)) {
2062 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2063 "journal_transaction_is_valid, commit offset %ld had bad "
2064 "time %d or length %d",
2065 c_bh->b_blocknr -
2066 SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2067 get_commit_trans_id(commit),
2068 get_commit_trans_len(commit));
2069 brelse(c_bh);
2070 if (oldest_invalid_trans_id) {
2071 *oldest_invalid_trans_id =
2072 get_desc_trans_id(desc);
2073 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2074 "journal-1004: "
2075 "transaction_is_valid setting oldest invalid trans_id "
2076 "to %d",
2077 get_desc_trans_id(desc));
2078 }
2079 return -1;
2080 }
2081 brelse(c_bh);
2082 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2083 "journal-1006: found valid "
2084 "transaction start offset %llu, len %d id %d",
2085 d_bh->b_blocknr -
2086 SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2087 get_desc_trans_len(desc),
2088 get_desc_trans_id(desc));
2089 return 1;
2090 } else {
2091 return 0;
2092 }
2093}
2094
2095static void brelse_array(struct buffer_head **heads, int num)
2096{
2097 int i;
2098 for (i = 0; i < num; i++) {
2099 brelse(heads[i]);
2100 }
2101}
2102
2103/*
2104 * given the start, and values for the oldest acceptable transactions,
2105 * this either reads in a replays a transaction, or returns because the
2106 * transaction is invalid, or too old.
2107 * NOTE: only called during fs mount
2108 */
2109static int journal_read_transaction(struct super_block *sb,
2110 unsigned long cur_dblock,
2111 unsigned long oldest_start,
2112 unsigned int oldest_trans_id,
2113 unsigned long newest_mount_id)
2114{
2115 struct reiserfs_journal *journal = SB_JOURNAL(sb);
2116 struct reiserfs_journal_desc *desc;
2117 struct reiserfs_journal_commit *commit;
2118 unsigned int trans_id = 0;
2119 struct buffer_head *c_bh;
2120 struct buffer_head *d_bh;
2121 struct buffer_head **log_blocks = NULL;
2122 struct buffer_head **real_blocks = NULL;
2123 unsigned int trans_offset;
2124 int i;
2125 int trans_half;
2126
2127 d_bh = journal_bread(sb, cur_dblock);
2128 if (!d_bh)
2129 return 1;
2130 desc = (struct reiserfs_journal_desc *)d_bh->b_data;
2131 trans_offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2132 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1037: "
2133 "journal_read_transaction, offset %llu, len %d mount_id %d",
2134 d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2135 get_desc_trans_len(desc), get_desc_mount_id(desc));
2136 if (get_desc_trans_id(desc) < oldest_trans_id) {
2137 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1039: "
2138 "journal_read_trans skipping because %lu is too old",
2139 cur_dblock -
2140 SB_ONDISK_JOURNAL_1st_BLOCK(sb));
2141 brelse(d_bh);
2142 return 1;
2143 }
2144 if (get_desc_mount_id(desc) != newest_mount_id) {
2145 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1146: "
2146 "journal_read_trans skipping because %d is != "
2147 "newest_mount_id %lu", get_desc_mount_id(desc),
2148 newest_mount_id);
2149 brelse(d_bh);
2150 return 1;
2151 }
2152 c_bh = journal_bread(sb, SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2153 ((trans_offset + get_desc_trans_len(desc) + 1) %
2154 SB_ONDISK_JOURNAL_SIZE(sb)));
2155 if (!c_bh) {
2156 brelse(d_bh);
2157 return 1;
2158 }
2159 commit = (struct reiserfs_journal_commit *)c_bh->b_data;
2160 if (journal_compare_desc_commit(sb, desc, commit)) {
2161 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2162 "journal_read_transaction, "
2163 "commit offset %llu had bad time %d or length %d",
2164 c_bh->b_blocknr -
2165 SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2166 get_commit_trans_id(commit),
2167 get_commit_trans_len(commit));
2168 brelse(c_bh);
2169 brelse(d_bh);
2170 return 1;
2171 }
2172
2173 if (bdev_read_only(sb->s_bdev)) {
2174 reiserfs_warning(sb, "clm-2076",
2175 "device is readonly, unable to replay log");
2176 brelse(c_bh);
2177 brelse(d_bh);
2178 return -EROFS;
2179 }
2180
2181 trans_id = get_desc_trans_id(desc);
2182 /*
2183 * now we know we've got a good transaction, and it was
2184 * inside the valid time ranges
2185 */
2186 log_blocks = kmalloc_array(get_desc_trans_len(desc),
2187 sizeof(struct buffer_head *),
2188 GFP_NOFS);
2189 real_blocks = kmalloc_array(get_desc_trans_len(desc),
2190 sizeof(struct buffer_head *),
2191 GFP_NOFS);
2192 if (!log_blocks || !real_blocks) {
2193 brelse(c_bh);
2194 brelse(d_bh);
2195 kfree(log_blocks);
2196 kfree(real_blocks);
2197 reiserfs_warning(sb, "journal-1169",
2198 "kmalloc failed, unable to mount FS");
2199 return -1;
2200 }
2201 /* get all the buffer heads */
2202 trans_half = journal_trans_half(sb->s_blocksize);
2203 for (i = 0; i < get_desc_trans_len(desc); i++) {
2204 log_blocks[i] =
2205 journal_getblk(sb,
2206 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2207 (trans_offset + 1 +
2208 i) % SB_ONDISK_JOURNAL_SIZE(sb));
2209 if (i < trans_half) {
2210 real_blocks[i] =
2211 sb_getblk(sb,
2212 le32_to_cpu(desc->j_realblock[i]));
2213 } else {
2214 real_blocks[i] =
2215 sb_getblk(sb,
2216 le32_to_cpu(commit->
2217 j_realblock[i - trans_half]));
2218 }
2219 if (real_blocks[i]->b_blocknr > SB_BLOCK_COUNT(sb)) {
2220 reiserfs_warning(sb, "journal-1207",
2221 "REPLAY FAILURE fsck required! "
2222 "Block to replay is outside of "
2223 "filesystem");
2224 goto abort_replay;
2225 }
2226 /* make sure we don't try to replay onto log or reserved area */
2227 if (is_block_in_log_or_reserved_area
2228 (sb, real_blocks[i]->b_blocknr)) {
2229 reiserfs_warning(sb, "journal-1204",
2230 "REPLAY FAILURE fsck required! "
2231 "Trying to replay onto a log block");
2232abort_replay:
2233 brelse_array(log_blocks, i);
2234 brelse_array(real_blocks, i);
2235 brelse(c_bh);
2236 brelse(d_bh);
2237 kfree(log_blocks);
2238 kfree(real_blocks);
2239 return -1;
2240 }
2241 }
2242 /* read in the log blocks, memcpy to the corresponding real block */
2243 bh_read_batch(get_desc_trans_len(desc), log_blocks);
2244 for (i = 0; i < get_desc_trans_len(desc); i++) {
2245
2246 wait_on_buffer(log_blocks[i]);
2247 if (!buffer_uptodate(log_blocks[i])) {
2248 reiserfs_warning(sb, "journal-1212",
2249 "REPLAY FAILURE fsck required! "
2250 "buffer write failed");
2251 brelse_array(log_blocks + i,
2252 get_desc_trans_len(desc) - i);
2253 brelse_array(real_blocks, get_desc_trans_len(desc));
2254 brelse(c_bh);
2255 brelse(d_bh);
2256 kfree(log_blocks);
2257 kfree(real_blocks);
2258 return -1;
2259 }
2260 memcpy(real_blocks[i]->b_data, log_blocks[i]->b_data,
2261 real_blocks[i]->b_size);
2262 set_buffer_uptodate(real_blocks[i]);
2263 brelse(log_blocks[i]);
2264 }
2265 /* flush out the real blocks */
2266 for (i = 0; i < get_desc_trans_len(desc); i++) {
2267 set_buffer_dirty(real_blocks[i]);
2268 write_dirty_buffer(real_blocks[i], 0);
2269 }
2270 for (i = 0; i < get_desc_trans_len(desc); i++) {
2271 wait_on_buffer(real_blocks[i]);
2272 if (!buffer_uptodate(real_blocks[i])) {
2273 reiserfs_warning(sb, "journal-1226",
2274 "REPLAY FAILURE, fsck required! "
2275 "buffer write failed");
2276 brelse_array(real_blocks + i,
2277 get_desc_trans_len(desc) - i);
2278 brelse(c_bh);
2279 brelse(d_bh);
2280 kfree(log_blocks);
2281 kfree(real_blocks);
2282 return -1;
2283 }
2284 brelse(real_blocks[i]);
2285 }
2286 cur_dblock =
2287 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2288 ((trans_offset + get_desc_trans_len(desc) +
2289 2) % SB_ONDISK_JOURNAL_SIZE(sb));
2290 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2291 "journal-1095: setting journal " "start to offset %ld",
2292 cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb));
2293
2294 /*
2295 * init starting values for the first transaction, in case
2296 * this is the last transaction to be replayed.
2297 */
2298 journal->j_start = cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2299 journal->j_last_flush_trans_id = trans_id;
2300 journal->j_trans_id = trans_id + 1;
2301 /* check for trans_id overflow */
2302 if (journal->j_trans_id == 0)
2303 journal->j_trans_id = 10;
2304 brelse(c_bh);
2305 brelse(d_bh);
2306 kfree(log_blocks);
2307 kfree(real_blocks);
2308 return 0;
2309}
2310
2311/*
2312 * This function reads blocks starting from block and to max_block of bufsize
2313 * size (but no more than BUFNR blocks at a time). This proved to improve
2314 * mounting speed on self-rebuilding raid5 arrays at least.
2315 * Right now it is only used from journal code. But later we might use it
2316 * from other places.
2317 * Note: Do not use journal_getblk/sb_getblk functions here!
2318 */
2319static struct buffer_head *reiserfs_breada(struct block_device *dev,
2320 b_blocknr_t block, int bufsize,
2321 b_blocknr_t max_block)
2322{
2323 struct buffer_head *bhlist[BUFNR];
2324 unsigned int blocks = BUFNR;
2325 struct buffer_head *bh;
2326 int i, j;
2327
2328 bh = __getblk(dev, block, bufsize);
2329 if (buffer_uptodate(bh))
2330 return (bh);
2331
2332 if (block + BUFNR > max_block) {
2333 blocks = max_block - block;
2334 }
2335 bhlist[0] = bh;
2336 j = 1;
2337 for (i = 1; i < blocks; i++) {
2338 bh = __getblk(dev, block + i, bufsize);
2339 if (buffer_uptodate(bh)) {
2340 brelse(bh);
2341 break;
2342 } else
2343 bhlist[j++] = bh;
2344 }
2345 bh = bhlist[0];
2346 bh_read_nowait(bh, 0);
2347 bh_readahead_batch(j - 1, &bhlist[1], 0);
2348 for (i = 1; i < j; i++)
2349 brelse(bhlist[i]);
2350 wait_on_buffer(bh);
2351 if (buffer_uptodate(bh))
2352 return bh;
2353 brelse(bh);
2354 return NULL;
2355}
2356
2357/*
2358 * read and replay the log
2359 * on a clean unmount, the journal header's next unflushed pointer will be
2360 * to an invalid transaction. This tests that before finding all the
2361 * transactions in the log, which makes normal mount times fast.
2362 *
2363 * After a crash, this starts with the next unflushed transaction, and
2364 * replays until it finds one too old, or invalid.
2365 *
2366 * On exit, it sets things up so the first transaction will work correctly.
2367 * NOTE: only called during fs mount
2368 */
2369static int journal_read(struct super_block *sb)
2370{
2371 struct reiserfs_journal *journal = SB_JOURNAL(sb);
2372 struct reiserfs_journal_desc *desc;
2373 unsigned int oldest_trans_id = 0;
2374 unsigned int oldest_invalid_trans_id = 0;
2375 time64_t start;
2376 unsigned long oldest_start = 0;
2377 unsigned long cur_dblock = 0;
2378 unsigned long newest_mount_id = 9;
2379 struct buffer_head *d_bh;
2380 struct reiserfs_journal_header *jh;
2381 int valid_journal_header = 0;
2382 int replay_count = 0;
2383 int continue_replay = 1;
2384 int ret;
2385
2386 cur_dblock = SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2387 reiserfs_info(sb, "checking transaction log (%pg)\n",
2388 journal->j_dev_bd);
2389 start = ktime_get_seconds();
2390
2391 /*
2392 * step 1, read in the journal header block. Check the transaction
2393 * it says is the first unflushed, and if that transaction is not
2394 * valid, replay is done
2395 */
2396 journal->j_header_bh = journal_bread(sb,
2397 SB_ONDISK_JOURNAL_1st_BLOCK(sb)
2398 + SB_ONDISK_JOURNAL_SIZE(sb));
2399 if (!journal->j_header_bh) {
2400 return 1;
2401 }
2402 jh = (struct reiserfs_journal_header *)(journal->j_header_bh->b_data);
2403 if (le32_to_cpu(jh->j_first_unflushed_offset) <
2404 SB_ONDISK_JOURNAL_SIZE(sb)
2405 && le32_to_cpu(jh->j_last_flush_trans_id) > 0) {
2406 oldest_start =
2407 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2408 le32_to_cpu(jh->j_first_unflushed_offset);
2409 oldest_trans_id = le32_to_cpu(jh->j_last_flush_trans_id) + 1;
2410 newest_mount_id = le32_to_cpu(jh->j_mount_id);
2411 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2412 "journal-1153: found in "
2413 "header: first_unflushed_offset %d, last_flushed_trans_id "
2414 "%lu", le32_to_cpu(jh->j_first_unflushed_offset),
2415 le32_to_cpu(jh->j_last_flush_trans_id));
2416 valid_journal_header = 1;
2417
2418 /*
2419 * now, we try to read the first unflushed offset. If it
2420 * is not valid, there is nothing more we can do, and it
2421 * makes no sense to read through the whole log.
2422 */
2423 d_bh =
2424 journal_bread(sb,
2425 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2426 le32_to_cpu(jh->j_first_unflushed_offset));
2427 ret = journal_transaction_is_valid(sb, d_bh, NULL, NULL);
2428 if (!ret) {
2429 continue_replay = 0;
2430 }
2431 brelse(d_bh);
2432 goto start_log_replay;
2433 }
2434
2435 /*
2436 * ok, there are transactions that need to be replayed. start
2437 * with the first log block, find all the valid transactions, and
2438 * pick out the oldest.
2439 */
2440 while (continue_replay
2441 && cur_dblock <
2442 (SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2443 SB_ONDISK_JOURNAL_SIZE(sb))) {
2444 /*
2445 * Note that it is required for blocksize of primary fs
2446 * device and journal device to be the same
2447 */
2448 d_bh =
2449 reiserfs_breada(journal->j_dev_bd, cur_dblock,
2450 sb->s_blocksize,
2451 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2452 SB_ONDISK_JOURNAL_SIZE(sb));
2453 ret =
2454 journal_transaction_is_valid(sb, d_bh,
2455 &oldest_invalid_trans_id,
2456 &newest_mount_id);
2457 if (ret == 1) {
2458 desc = (struct reiserfs_journal_desc *)d_bh->b_data;
2459 if (oldest_start == 0) { /* init all oldest_ values */
2460 oldest_trans_id = get_desc_trans_id(desc);
2461 oldest_start = d_bh->b_blocknr;
2462 newest_mount_id = get_desc_mount_id(desc);
2463 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2464 "journal-1179: Setting "
2465 "oldest_start to offset %llu, trans_id %lu",
2466 oldest_start -
2467 SB_ONDISK_JOURNAL_1st_BLOCK
2468 (sb), oldest_trans_id);
2469 } else if (oldest_trans_id > get_desc_trans_id(desc)) {
2470 /* one we just read was older */
2471 oldest_trans_id = get_desc_trans_id(desc);
2472 oldest_start = d_bh->b_blocknr;
2473 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2474 "journal-1180: Resetting "
2475 "oldest_start to offset %lu, trans_id %lu",
2476 oldest_start -
2477 SB_ONDISK_JOURNAL_1st_BLOCK
2478 (sb), oldest_trans_id);
2479 }
2480 if (newest_mount_id < get_desc_mount_id(desc)) {
2481 newest_mount_id = get_desc_mount_id(desc);
2482 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2483 "journal-1299: Setting "
2484 "newest_mount_id to %d",
2485 get_desc_mount_id(desc));
2486 }
2487 cur_dblock += get_desc_trans_len(desc) + 2;
2488 } else {
2489 cur_dblock++;
2490 }
2491 brelse(d_bh);
2492 }
2493
2494start_log_replay:
2495 cur_dblock = oldest_start;
2496 if (oldest_trans_id) {
2497 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2498 "journal-1206: Starting replay "
2499 "from offset %llu, trans_id %lu",
2500 cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2501 oldest_trans_id);
2502
2503 }
2504 replay_count = 0;
2505 while (continue_replay && oldest_trans_id > 0) {
2506 ret =
2507 journal_read_transaction(sb, cur_dblock, oldest_start,
2508 oldest_trans_id, newest_mount_id);
2509 if (ret < 0) {
2510 return ret;
2511 } else if (ret != 0) {
2512 break;
2513 }
2514 cur_dblock =
2515 SB_ONDISK_JOURNAL_1st_BLOCK(sb) + journal->j_start;
2516 replay_count++;
2517 if (cur_dblock == oldest_start)
2518 break;
2519 }
2520
2521 if (oldest_trans_id == 0) {
2522 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2523 "journal-1225: No valid " "transactions found");
2524 }
2525 /*
2526 * j_start does not get set correctly if we don't replay any
2527 * transactions. if we had a valid journal_header, set j_start
2528 * to the first unflushed transaction value, copy the trans_id
2529 * from the header
2530 */
2531 if (valid_journal_header && replay_count == 0) {
2532 journal->j_start = le32_to_cpu(jh->j_first_unflushed_offset);
2533 journal->j_trans_id =
2534 le32_to_cpu(jh->j_last_flush_trans_id) + 1;
2535 /* check for trans_id overflow */
2536 if (journal->j_trans_id == 0)
2537 journal->j_trans_id = 10;
2538 journal->j_last_flush_trans_id =
2539 le32_to_cpu(jh->j_last_flush_trans_id);
2540 journal->j_mount_id = le32_to_cpu(jh->j_mount_id) + 1;
2541 } else {
2542 journal->j_mount_id = newest_mount_id + 1;
2543 }
2544 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1299: Setting "
2545 "newest_mount_id to %lu", journal->j_mount_id);
2546 journal->j_first_unflushed_offset = journal->j_start;
2547 if (replay_count > 0) {
2548 reiserfs_info(sb,
2549 "replayed %d transactions in %lu seconds\n",
2550 replay_count, ktime_get_seconds() - start);
2551 }
2552 /* needed to satisfy the locking in _update_journal_header_block */
2553 reiserfs_write_lock(sb);
2554 if (!bdev_read_only(sb->s_bdev) &&
2555 _update_journal_header_block(sb, journal->j_start,
2556 journal->j_last_flush_trans_id)) {
2557 reiserfs_write_unlock(sb);
2558 /*
2559 * replay failed, caller must call free_journal_ram and abort
2560 * the mount
2561 */
2562 return -1;
2563 }
2564 reiserfs_write_unlock(sb);
2565 return 0;
2566}
2567
2568static struct reiserfs_journal_list *alloc_journal_list(struct super_block *s)
2569{
2570 struct reiserfs_journal_list *jl;
2571 jl = kzalloc(sizeof(struct reiserfs_journal_list),
2572 GFP_NOFS | __GFP_NOFAIL);
2573 INIT_LIST_HEAD(&jl->j_list);
2574 INIT_LIST_HEAD(&jl->j_working_list);
2575 INIT_LIST_HEAD(&jl->j_tail_bh_list);
2576 INIT_LIST_HEAD(&jl->j_bh_list);
2577 mutex_init(&jl->j_commit_mutex);
2578 SB_JOURNAL(s)->j_num_lists++;
2579 get_journal_list(jl);
2580 return jl;
2581}
2582
2583static void journal_list_init(struct super_block *sb)
2584{
2585 SB_JOURNAL(sb)->j_current_jl = alloc_journal_list(sb);
2586}
2587
2588static void release_journal_dev(struct super_block *super,
2589 struct reiserfs_journal *journal)
2590{
2591 if (journal->j_dev_bd != NULL) {
2592 blkdev_put(journal->j_dev_bd, journal->j_dev_mode);
2593 journal->j_dev_bd = NULL;
2594 }
2595}
2596
2597static int journal_init_dev(struct super_block *super,
2598 struct reiserfs_journal *journal,
2599 const char *jdev_name)
2600{
2601 int result;
2602 dev_t jdev;
2603 fmode_t blkdev_mode = FMODE_READ | FMODE_WRITE | FMODE_EXCL;
2604
2605 result = 0;
2606
2607 journal->j_dev_bd = NULL;
2608 jdev = SB_ONDISK_JOURNAL_DEVICE(super) ?
2609 new_decode_dev(SB_ONDISK_JOURNAL_DEVICE(super)) : super->s_dev;
2610
2611 if (bdev_read_only(super->s_bdev))
2612 blkdev_mode = FMODE_READ;
2613
2614 /* there is no "jdev" option and journal is on separate device */
2615 if ((!jdev_name || !jdev_name[0])) {
2616 if (jdev == super->s_dev)
2617 blkdev_mode &= ~FMODE_EXCL;
2618 journal->j_dev_bd = blkdev_get_by_dev(jdev, blkdev_mode,
2619 journal);
2620 journal->j_dev_mode = blkdev_mode;
2621 if (IS_ERR(journal->j_dev_bd)) {
2622 result = PTR_ERR(journal->j_dev_bd);
2623 journal->j_dev_bd = NULL;
2624 reiserfs_warning(super, "sh-458",
2625 "cannot init journal device unknown-block(%u,%u): %i",
2626 MAJOR(jdev), MINOR(jdev), result);
2627 return result;
2628 } else if (jdev != super->s_dev)
2629 set_blocksize(journal->j_dev_bd, super->s_blocksize);
2630
2631 return 0;
2632 }
2633
2634 journal->j_dev_mode = blkdev_mode;
2635 journal->j_dev_bd = blkdev_get_by_path(jdev_name, blkdev_mode, journal);
2636 if (IS_ERR(journal->j_dev_bd)) {
2637 result = PTR_ERR(journal->j_dev_bd);
2638 journal->j_dev_bd = NULL;
2639 reiserfs_warning(super, "sh-457",
2640 "journal_init_dev: Cannot open '%s': %i",
2641 jdev_name, result);
2642 return result;
2643 }
2644
2645 set_blocksize(journal->j_dev_bd, super->s_blocksize);
2646 reiserfs_info(super,
2647 "journal_init_dev: journal device: %pg\n",
2648 journal->j_dev_bd);
2649 return 0;
2650}
2651
2652/*
2653 * When creating/tuning a file system user can assign some
2654 * journal params within boundaries which depend on the ratio
2655 * blocksize/standard_blocksize.
2656 *
2657 * For blocks >= standard_blocksize transaction size should
2658 * be not less then JOURNAL_TRANS_MIN_DEFAULT, and not more
2659 * then JOURNAL_TRANS_MAX_DEFAULT.
2660 *
2661 * For blocks < standard_blocksize these boundaries should be
2662 * decreased proportionally.
2663 */
2664#define REISERFS_STANDARD_BLKSIZE (4096)
2665
2666static int check_advise_trans_params(struct super_block *sb,
2667 struct reiserfs_journal *journal)
2668{
2669 if (journal->j_trans_max) {
2670 /* Non-default journal params. Do sanity check for them. */
2671 int ratio = 1;
2672 if (sb->s_blocksize < REISERFS_STANDARD_BLKSIZE)
2673 ratio = REISERFS_STANDARD_BLKSIZE / sb->s_blocksize;
2674
2675 if (journal->j_trans_max > JOURNAL_TRANS_MAX_DEFAULT / ratio ||
2676 journal->j_trans_max < JOURNAL_TRANS_MIN_DEFAULT / ratio ||
2677 SB_ONDISK_JOURNAL_SIZE(sb) / journal->j_trans_max <
2678 JOURNAL_MIN_RATIO) {
2679 reiserfs_warning(sb, "sh-462",
2680 "bad transaction max size (%u). "
2681 "FSCK?", journal->j_trans_max);
2682 return 1;
2683 }
2684 if (journal->j_max_batch != (journal->j_trans_max) *
2685 JOURNAL_MAX_BATCH_DEFAULT/JOURNAL_TRANS_MAX_DEFAULT) {
2686 reiserfs_warning(sb, "sh-463",
2687 "bad transaction max batch (%u). "
2688 "FSCK?", journal->j_max_batch);
2689 return 1;
2690 }
2691 } else {
2692 /*
2693 * Default journal params.
2694 * The file system was created by old version
2695 * of mkreiserfs, so some fields contain zeros,
2696 * and we need to advise proper values for them
2697 */
2698 if (sb->s_blocksize != REISERFS_STANDARD_BLKSIZE) {
2699 reiserfs_warning(sb, "sh-464", "bad blocksize (%u)",
2700 sb->s_blocksize);
2701 return 1;
2702 }
2703 journal->j_trans_max = JOURNAL_TRANS_MAX_DEFAULT;
2704 journal->j_max_batch = JOURNAL_MAX_BATCH_DEFAULT;
2705 journal->j_max_commit_age = JOURNAL_MAX_COMMIT_AGE;
2706 }
2707 return 0;
2708}
2709
2710/* must be called once on fs mount. calls journal_read for you */
2711int journal_init(struct super_block *sb, const char *j_dev_name,
2712 int old_format, unsigned int commit_max_age)
2713{
2714 int num_cnodes = SB_ONDISK_JOURNAL_SIZE(sb) * 2;
2715 struct buffer_head *bhjh;
2716 struct reiserfs_super_block *rs;
2717 struct reiserfs_journal_header *jh;
2718 struct reiserfs_journal *journal;
2719 struct reiserfs_journal_list *jl;
2720 int ret;
2721
2722 journal = SB_JOURNAL(sb) = vzalloc(sizeof(struct reiserfs_journal));
2723 if (!journal) {
2724 reiserfs_warning(sb, "journal-1256",
2725 "unable to get memory for journal structure");
2726 return 1;
2727 }
2728 INIT_LIST_HEAD(&journal->j_bitmap_nodes);
2729 INIT_LIST_HEAD(&journal->j_prealloc_list);
2730 INIT_LIST_HEAD(&journal->j_working_list);
2731 INIT_LIST_HEAD(&journal->j_journal_list);
2732 journal->j_persistent_trans = 0;
2733 if (reiserfs_allocate_list_bitmaps(sb, journal->j_list_bitmap,
2734 reiserfs_bmap_count(sb)))
2735 goto free_and_return;
2736
2737 allocate_bitmap_nodes(sb);
2738
2739 /* reserved for journal area support */
2740 SB_JOURNAL_1st_RESERVED_BLOCK(sb) = (old_format ?
2741 REISERFS_OLD_DISK_OFFSET_IN_BYTES
2742 / sb->s_blocksize +
2743 reiserfs_bmap_count(sb) +
2744 1 :
2745 REISERFS_DISK_OFFSET_IN_BYTES /
2746 sb->s_blocksize + 2);
2747
2748 /*
2749 * Sanity check to see is the standard journal fitting
2750 * within first bitmap (actual for small blocksizes)
2751 */
2752 if (!SB_ONDISK_JOURNAL_DEVICE(sb) &&
2753 (SB_JOURNAL_1st_RESERVED_BLOCK(sb) +
2754 SB_ONDISK_JOURNAL_SIZE(sb) > sb->s_blocksize * 8)) {
2755 reiserfs_warning(sb, "journal-1393",
2756 "journal does not fit for area addressed "
2757 "by first of bitmap blocks. It starts at "
2758 "%u and its size is %u. Block size %ld",
2759 SB_JOURNAL_1st_RESERVED_BLOCK(sb),
2760 SB_ONDISK_JOURNAL_SIZE(sb),
2761 sb->s_blocksize);
2762 goto free_and_return;
2763 }
2764
2765 /*
2766 * Sanity check to see if journal first block is correct.
2767 * If journal first block is invalid it can cause
2768 * zeroing important superblock members.
2769 */
2770 if (!SB_ONDISK_JOURNAL_DEVICE(sb) &&
2771 SB_ONDISK_JOURNAL_1st_BLOCK(sb) < SB_JOURNAL_1st_RESERVED_BLOCK(sb)) {
2772 reiserfs_warning(sb, "journal-1393",
2773 "journal 1st super block is invalid: 1st reserved block %d, but actual 1st block is %d",
2774 SB_JOURNAL_1st_RESERVED_BLOCK(sb),
2775 SB_ONDISK_JOURNAL_1st_BLOCK(sb));
2776 goto free_and_return;
2777 }
2778
2779 if (journal_init_dev(sb, journal, j_dev_name) != 0) {
2780 reiserfs_warning(sb, "sh-462",
2781 "unable to initialize journal device");
2782 goto free_and_return;
2783 }
2784
2785 rs = SB_DISK_SUPER_BLOCK(sb);
2786
2787 /* read journal header */
2788 bhjh = journal_bread(sb,
2789 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2790 SB_ONDISK_JOURNAL_SIZE(sb));
2791 if (!bhjh) {
2792 reiserfs_warning(sb, "sh-459",
2793 "unable to read journal header");
2794 goto free_and_return;
2795 }
2796 jh = (struct reiserfs_journal_header *)(bhjh->b_data);
2797
2798 /* make sure that journal matches to the super block */
2799 if (is_reiserfs_jr(rs)
2800 && (le32_to_cpu(jh->jh_journal.jp_journal_magic) !=
2801 sb_jp_journal_magic(rs))) {
2802 reiserfs_warning(sb, "sh-460",
2803 "journal header magic %x (device %pg) does "
2804 "not match to magic found in super block %x",
2805 jh->jh_journal.jp_journal_magic,
2806 journal->j_dev_bd,
2807 sb_jp_journal_magic(rs));
2808 brelse(bhjh);
2809 goto free_and_return;
2810 }
2811
2812 journal->j_trans_max = le32_to_cpu(jh->jh_journal.jp_journal_trans_max);
2813 journal->j_max_batch = le32_to_cpu(jh->jh_journal.jp_journal_max_batch);
2814 journal->j_max_commit_age =
2815 le32_to_cpu(jh->jh_journal.jp_journal_max_commit_age);
2816 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
2817
2818 if (check_advise_trans_params(sb, journal) != 0)
2819 goto free_and_return;
2820 journal->j_default_max_commit_age = journal->j_max_commit_age;
2821
2822 if (commit_max_age != 0) {
2823 journal->j_max_commit_age = commit_max_age;
2824 journal->j_max_trans_age = commit_max_age;
2825 }
2826
2827 reiserfs_info(sb, "journal params: device %pg, size %u, "
2828 "journal first block %u, max trans len %u, max batch %u, "
2829 "max commit age %u, max trans age %u\n",
2830 journal->j_dev_bd,
2831 SB_ONDISK_JOURNAL_SIZE(sb),
2832 SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2833 journal->j_trans_max,
2834 journal->j_max_batch,
2835 journal->j_max_commit_age, journal->j_max_trans_age);
2836
2837 brelse(bhjh);
2838
2839 journal->j_list_bitmap_index = 0;
2840 journal_list_init(sb);
2841
2842 memset(journal->j_list_hash_table, 0,
2843 JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *));
2844
2845 INIT_LIST_HEAD(&journal->j_dirty_buffers);
2846 spin_lock_init(&journal->j_dirty_buffers_lock);
2847
2848 journal->j_start = 0;
2849 journal->j_len = 0;
2850 journal->j_len_alloc = 0;
2851 atomic_set(&journal->j_wcount, 0);
2852 atomic_set(&journal->j_async_throttle, 0);
2853 journal->j_bcount = 0;
2854 journal->j_trans_start_time = 0;
2855 journal->j_last = NULL;
2856 journal->j_first = NULL;
2857 init_waitqueue_head(&journal->j_join_wait);
2858 mutex_init(&journal->j_mutex);
2859 mutex_init(&journal->j_flush_mutex);
2860
2861 journal->j_trans_id = 10;
2862 journal->j_mount_id = 10;
2863 journal->j_state = 0;
2864 atomic_set(&journal->j_jlock, 0);
2865 journal->j_cnode_free_list = allocate_cnodes(num_cnodes);
2866 journal->j_cnode_free_orig = journal->j_cnode_free_list;
2867 journal->j_cnode_free = journal->j_cnode_free_list ? num_cnodes : 0;
2868 journal->j_cnode_used = 0;
2869 journal->j_must_wait = 0;
2870
2871 if (journal->j_cnode_free == 0) {
2872 reiserfs_warning(sb, "journal-2004", "Journal cnode memory "
2873 "allocation failed (%ld bytes). Journal is "
2874 "too large for available memory. Usually "
2875 "this is due to a journal that is too large.",
2876 sizeof (struct reiserfs_journal_cnode) * num_cnodes);
2877 goto free_and_return;
2878 }
2879
2880 init_journal_hash(sb);
2881 jl = journal->j_current_jl;
2882
2883 /*
2884 * get_list_bitmap() may call flush_commit_list() which
2885 * requires the lock. Calling flush_commit_list() shouldn't happen
2886 * this early but I like to be paranoid.
2887 */
2888 reiserfs_write_lock(sb);
2889 jl->j_list_bitmap = get_list_bitmap(sb, jl);
2890 reiserfs_write_unlock(sb);
2891 if (!jl->j_list_bitmap) {
2892 reiserfs_warning(sb, "journal-2005",
2893 "get_list_bitmap failed for journal list 0");
2894 goto free_and_return;
2895 }
2896
2897 ret = journal_read(sb);
2898 if (ret < 0) {
2899 reiserfs_warning(sb, "reiserfs-2006",
2900 "Replay Failure, unable to mount");
2901 goto free_and_return;
2902 }
2903
2904 INIT_DELAYED_WORK(&journal->j_work, flush_async_commits);
2905 journal->j_work_sb = sb;
2906 return 0;
2907free_and_return:
2908 free_journal_ram(sb);
2909 return 1;
2910}
2911
2912/*
2913 * test for a polite end of the current transaction. Used by file_write,
2914 * and should be used by delete to make sure they don't write more than
2915 * can fit inside a single transaction
2916 */
2917int journal_transaction_should_end(struct reiserfs_transaction_handle *th,
2918 int new_alloc)
2919{
2920 struct reiserfs_journal *journal = SB_JOURNAL(th->t_super);
2921 time64_t now = ktime_get_seconds();
2922 /* cannot restart while nested */
2923 BUG_ON(!th->t_trans_id);
2924 if (th->t_refcount > 1)
2925 return 0;
2926 if (journal->j_must_wait > 0 ||
2927 (journal->j_len_alloc + new_alloc) >= journal->j_max_batch ||
2928 atomic_read(&journal->j_jlock) ||
2929 (now - journal->j_trans_start_time) > journal->j_max_trans_age ||
2930 journal->j_cnode_free < (journal->j_trans_max * 3)) {
2931 return 1;
2932 }
2933
2934 journal->j_len_alloc += new_alloc;
2935 th->t_blocks_allocated += new_alloc ;
2936 return 0;
2937}
2938
2939/* this must be called inside a transaction */
2940void reiserfs_block_writes(struct reiserfs_transaction_handle *th)
2941{
2942 struct reiserfs_journal *journal = SB_JOURNAL(th->t_super);
2943 BUG_ON(!th->t_trans_id);
2944 journal->j_must_wait = 1;
2945 set_bit(J_WRITERS_BLOCKED, &journal->j_state);
2946 return;
2947}
2948
2949/* this must be called without a transaction started */
2950void reiserfs_allow_writes(struct super_block *s)
2951{
2952 struct reiserfs_journal *journal = SB_JOURNAL(s);
2953 clear_bit(J_WRITERS_BLOCKED, &journal->j_state);
2954 wake_up(&journal->j_join_wait);
2955}
2956
2957/* this must be called without a transaction started */
2958void reiserfs_wait_on_write_block(struct super_block *s)
2959{
2960 struct reiserfs_journal *journal = SB_JOURNAL(s);
2961 wait_event(journal->j_join_wait,
2962 !test_bit(J_WRITERS_BLOCKED, &journal->j_state));
2963}
2964
2965static void queue_log_writer(struct super_block *s)
2966{
2967 wait_queue_entry_t wait;
2968 struct reiserfs_journal *journal = SB_JOURNAL(s);
2969 set_bit(J_WRITERS_QUEUED, &journal->j_state);
2970
2971 /*
2972 * we don't want to use wait_event here because
2973 * we only want to wait once.
2974 */
2975 init_waitqueue_entry(&wait, current);
2976 add_wait_queue(&journal->j_join_wait, &wait);
2977 set_current_state(TASK_UNINTERRUPTIBLE);
2978 if (test_bit(J_WRITERS_QUEUED, &journal->j_state)) {
2979 int depth = reiserfs_write_unlock_nested(s);
2980 schedule();
2981 reiserfs_write_lock_nested(s, depth);
2982 }
2983 __set_current_state(TASK_RUNNING);
2984 remove_wait_queue(&journal->j_join_wait, &wait);
2985}
2986
2987static void wake_queued_writers(struct super_block *s)
2988{
2989 struct reiserfs_journal *journal = SB_JOURNAL(s);
2990 if (test_and_clear_bit(J_WRITERS_QUEUED, &journal->j_state))
2991 wake_up(&journal->j_join_wait);
2992}
2993
2994static void let_transaction_grow(struct super_block *sb, unsigned int trans_id)
2995{
2996 struct reiserfs_journal *journal = SB_JOURNAL(sb);
2997 unsigned long bcount = journal->j_bcount;
2998 while (1) {
2999 int depth;
3000
3001 depth = reiserfs_write_unlock_nested(sb);
3002 schedule_timeout_uninterruptible(1);
3003 reiserfs_write_lock_nested(sb, depth);
3004
3005 journal->j_current_jl->j_state |= LIST_COMMIT_PENDING;
3006 while ((atomic_read(&journal->j_wcount) > 0 ||
3007 atomic_read(&journal->j_jlock)) &&
3008 journal->j_trans_id == trans_id) {
3009 queue_log_writer(sb);
3010 }
3011 if (journal->j_trans_id != trans_id)
3012 break;
3013 if (bcount == journal->j_bcount)
3014 break;
3015 bcount = journal->j_bcount;
3016 }
3017}
3018
3019/*
3020 * join == true if you must join an existing transaction.
3021 * join == false if you can deal with waiting for others to finish
3022 *
3023 * this will block until the transaction is joinable. send the number of
3024 * blocks you expect to use in nblocks.
3025*/
3026static int do_journal_begin_r(struct reiserfs_transaction_handle *th,
3027 struct super_block *sb, unsigned long nblocks,
3028 int join)
3029{
3030 time64_t now = ktime_get_seconds();
3031 unsigned int old_trans_id;
3032 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3033 struct reiserfs_transaction_handle myth;
3034 int sched_count = 0;
3035 int retval;
3036 int depth;
3037
3038 reiserfs_check_lock_depth(sb, "journal_begin");
3039 BUG_ON(nblocks > journal->j_trans_max);
3040
3041 PROC_INFO_INC(sb, journal.journal_being);
3042 /* set here for journal_join */
3043 th->t_refcount = 1;
3044 th->t_super = sb;
3045
3046relock:
3047 lock_journal(sb);
3048 if (join != JBEGIN_ABORT && reiserfs_is_journal_aborted(journal)) {
3049 unlock_journal(sb);
3050 retval = journal->j_errno;
3051 goto out_fail;
3052 }
3053 journal->j_bcount++;
3054
3055 if (test_bit(J_WRITERS_BLOCKED, &journal->j_state)) {
3056 unlock_journal(sb);
3057 depth = reiserfs_write_unlock_nested(sb);
3058 reiserfs_wait_on_write_block(sb);
3059 reiserfs_write_lock_nested(sb, depth);
3060 PROC_INFO_INC(sb, journal.journal_relock_writers);
3061 goto relock;
3062 }
3063 now = ktime_get_seconds();
3064
3065 /*
3066 * if there is no room in the journal OR
3067 * if this transaction is too old, and we weren't called joinable,
3068 * wait for it to finish before beginning we don't sleep if there
3069 * aren't other writers
3070 */
3071
3072 if ((!join && journal->j_must_wait > 0) ||
3073 (!join
3074 && (journal->j_len_alloc + nblocks + 2) >= journal->j_max_batch)
3075 || (!join && atomic_read(&journal->j_wcount) > 0
3076 && journal->j_trans_start_time > 0
3077 && (now - journal->j_trans_start_time) >
3078 journal->j_max_trans_age) || (!join
3079 && atomic_read(&journal->j_jlock))
3080 || (!join && journal->j_cnode_free < (journal->j_trans_max * 3))) {
3081
3082 old_trans_id = journal->j_trans_id;
3083 /* allow others to finish this transaction */
3084 unlock_journal(sb);
3085
3086 if (!join && (journal->j_len_alloc + nblocks + 2) >=
3087 journal->j_max_batch &&
3088 ((journal->j_len + nblocks + 2) * 100) <
3089 (journal->j_len_alloc * 75)) {
3090 if (atomic_read(&journal->j_wcount) > 10) {
3091 sched_count++;
3092 queue_log_writer(sb);
3093 goto relock;
3094 }
3095 }
3096 /*
3097 * don't mess with joining the transaction if all we
3098 * have to do is wait for someone else to do a commit
3099 */
3100 if (atomic_read(&journal->j_jlock)) {
3101 while (journal->j_trans_id == old_trans_id &&
3102 atomic_read(&journal->j_jlock)) {
3103 queue_log_writer(sb);
3104 }
3105 goto relock;
3106 }
3107 retval = journal_join(&myth, sb);
3108 if (retval)
3109 goto out_fail;
3110
3111 /* someone might have ended the transaction while we joined */
3112 if (old_trans_id != journal->j_trans_id) {
3113 retval = do_journal_end(&myth, 0);
3114 } else {
3115 retval = do_journal_end(&myth, COMMIT_NOW);
3116 }
3117
3118 if (retval)
3119 goto out_fail;
3120
3121 PROC_INFO_INC(sb, journal.journal_relock_wcount);
3122 goto relock;
3123 }
3124 /* we are the first writer, set trans_id */
3125 if (journal->j_trans_start_time == 0) {
3126 journal->j_trans_start_time = ktime_get_seconds();
3127 }
3128 atomic_inc(&journal->j_wcount);
3129 journal->j_len_alloc += nblocks;
3130 th->t_blocks_logged = 0;
3131 th->t_blocks_allocated = nblocks;
3132 th->t_trans_id = journal->j_trans_id;
3133 unlock_journal(sb);
3134 INIT_LIST_HEAD(&th->t_list);
3135 return 0;
3136
3137out_fail:
3138 memset(th, 0, sizeof(*th));
3139 /*
3140 * Re-set th->t_super, so we can properly keep track of how many
3141 * persistent transactions there are. We need to do this so if this
3142 * call is part of a failed restart_transaction, we can free it later
3143 */
3144 th->t_super = sb;
3145 return retval;
3146}
3147
3148struct reiserfs_transaction_handle *reiserfs_persistent_transaction(struct
3149 super_block
3150 *s,
3151 int nblocks)
3152{
3153 int ret;
3154 struct reiserfs_transaction_handle *th;
3155
3156 /*
3157 * if we're nesting into an existing transaction. It will be
3158 * persistent on its own
3159 */
3160 if (reiserfs_transaction_running(s)) {
3161 th = current->journal_info;
3162 th->t_refcount++;
3163 BUG_ON(th->t_refcount < 2);
3164
3165 return th;
3166 }
3167 th = kmalloc(sizeof(struct reiserfs_transaction_handle), GFP_NOFS);
3168 if (!th)
3169 return NULL;
3170 ret = journal_begin(th, s, nblocks);
3171 if (ret) {
3172 kfree(th);
3173 return NULL;
3174 }
3175
3176 SB_JOURNAL(s)->j_persistent_trans++;
3177 return th;
3178}
3179
3180int reiserfs_end_persistent_transaction(struct reiserfs_transaction_handle *th)
3181{
3182 struct super_block *s = th->t_super;
3183 int ret = 0;
3184 if (th->t_trans_id)
3185 ret = journal_end(th);
3186 else
3187 ret = -EIO;
3188 if (th->t_refcount == 0) {
3189 SB_JOURNAL(s)->j_persistent_trans--;
3190 kfree(th);
3191 }
3192 return ret;
3193}
3194
3195static int journal_join(struct reiserfs_transaction_handle *th,
3196 struct super_block *sb)
3197{
3198 struct reiserfs_transaction_handle *cur_th = current->journal_info;
3199
3200 /*
3201 * this keeps do_journal_end from NULLing out the
3202 * current->journal_info pointer
3203 */
3204 th->t_handle_save = cur_th;
3205 BUG_ON(cur_th && cur_th->t_refcount > 1);
3206 return do_journal_begin_r(th, sb, 1, JBEGIN_JOIN);
3207}
3208
3209int journal_join_abort(struct reiserfs_transaction_handle *th,
3210 struct super_block *sb)
3211{
3212 struct reiserfs_transaction_handle *cur_th = current->journal_info;
3213
3214 /*
3215 * this keeps do_journal_end from NULLing out the
3216 * current->journal_info pointer
3217 */
3218 th->t_handle_save = cur_th;
3219 BUG_ON(cur_th && cur_th->t_refcount > 1);
3220 return do_journal_begin_r(th, sb, 1, JBEGIN_ABORT);
3221}
3222
3223int journal_begin(struct reiserfs_transaction_handle *th,
3224 struct super_block *sb, unsigned long nblocks)
3225{
3226 struct reiserfs_transaction_handle *cur_th = current->journal_info;
3227 int ret;
3228
3229 th->t_handle_save = NULL;
3230 if (cur_th) {
3231 /* we are nesting into the current transaction */
3232 if (cur_th->t_super == sb) {
3233 BUG_ON(!cur_th->t_refcount);
3234 cur_th->t_refcount++;
3235 memcpy(th, cur_th, sizeof(*th));
3236 if (th->t_refcount <= 1)
3237 reiserfs_warning(sb, "reiserfs-2005",
3238 "BAD: refcount <= 1, but "
3239 "journal_info != 0");
3240 return 0;
3241 } else {
3242 /*
3243 * we've ended up with a handle from a different
3244 * filesystem. save it and restore on journal_end.
3245 * This should never really happen...
3246 */
3247 reiserfs_warning(sb, "clm-2100",
3248 "nesting info a different FS");
3249 th->t_handle_save = current->journal_info;
3250 current->journal_info = th;
3251 }
3252 } else {
3253 current->journal_info = th;
3254 }
3255 ret = do_journal_begin_r(th, sb, nblocks, JBEGIN_REG);
3256 BUG_ON(current->journal_info != th);
3257
3258 /*
3259 * I guess this boils down to being the reciprocal of clm-2100 above.
3260 * If do_journal_begin_r fails, we need to put it back, since
3261 * journal_end won't be called to do it. */
3262 if (ret)
3263 current->journal_info = th->t_handle_save;
3264 else
3265 BUG_ON(!th->t_refcount);
3266
3267 return ret;
3268}
3269
3270/*
3271 * puts bh into the current transaction. If it was already there, reorders
3272 * removes the old pointers from the hash, and puts new ones in (to make
3273 * sure replay happen in the right order).
3274 *
3275 * if it was dirty, cleans and files onto the clean list. I can't let it
3276 * be dirty again until the transaction is committed.
3277 *
3278 * if j_len, is bigger than j_len_alloc, it pushes j_len_alloc to 10 + j_len.
3279 */
3280int journal_mark_dirty(struct reiserfs_transaction_handle *th,
3281 struct buffer_head *bh)
3282{
3283 struct super_block *sb = th->t_super;
3284 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3285 struct reiserfs_journal_cnode *cn = NULL;
3286 int count_already_incd = 0;
3287 int prepared = 0;
3288 BUG_ON(!th->t_trans_id);
3289
3290 PROC_INFO_INC(sb, journal.mark_dirty);
3291 if (th->t_trans_id != journal->j_trans_id) {
3292 reiserfs_panic(th->t_super, "journal-1577",
3293 "handle trans id %ld != current trans id %ld",
3294 th->t_trans_id, journal->j_trans_id);
3295 }
3296
3297 prepared = test_clear_buffer_journal_prepared(bh);
3298 clear_buffer_journal_restore_dirty(bh);
3299 /* already in this transaction, we are done */
3300 if (buffer_journaled(bh)) {
3301 PROC_INFO_INC(sb, journal.mark_dirty_already);
3302 return 0;
3303 }
3304
3305 /*
3306 * this must be turned into a panic instead of a warning. We can't
3307 * allow a dirty or journal_dirty or locked buffer to be logged, as
3308 * some changes could get to disk too early. NOT GOOD.
3309 */
3310 if (!prepared || buffer_dirty(bh)) {
3311 reiserfs_warning(sb, "journal-1777",
3312 "buffer %llu bad state "
3313 "%cPREPARED %cLOCKED %cDIRTY %cJDIRTY_WAIT",
3314 (unsigned long long)bh->b_blocknr,
3315 prepared ? ' ' : '!',
3316 buffer_locked(bh) ? ' ' : '!',
3317 buffer_dirty(bh) ? ' ' : '!',
3318 buffer_journal_dirty(bh) ? ' ' : '!');
3319 }
3320
3321 if (atomic_read(&journal->j_wcount) <= 0) {
3322 reiserfs_warning(sb, "journal-1409",
3323 "returning because j_wcount was %d",
3324 atomic_read(&journal->j_wcount));
3325 return 1;
3326 }
3327 /*
3328 * this error means I've screwed up, and we've overflowed
3329 * the transaction. Nothing can be done here, except make the
3330 * FS readonly or panic.
3331 */
3332 if (journal->j_len >= journal->j_trans_max) {
3333 reiserfs_panic(th->t_super, "journal-1413",
3334 "j_len (%lu) is too big",
3335 journal->j_len);
3336 }
3337
3338 if (buffer_journal_dirty(bh)) {
3339 count_already_incd = 1;
3340 PROC_INFO_INC(sb, journal.mark_dirty_notjournal);
3341 clear_buffer_journal_dirty(bh);
3342 }
3343
3344 if (journal->j_len > journal->j_len_alloc) {
3345 journal->j_len_alloc = journal->j_len + JOURNAL_PER_BALANCE_CNT;
3346 }
3347
3348 set_buffer_journaled(bh);
3349
3350 /* now put this guy on the end */
3351 if (!cn) {
3352 cn = get_cnode(sb);
3353 if (!cn) {
3354 reiserfs_panic(sb, "journal-4", "get_cnode failed!");
3355 }
3356
3357 if (th->t_blocks_logged == th->t_blocks_allocated) {
3358 th->t_blocks_allocated += JOURNAL_PER_BALANCE_CNT;
3359 journal->j_len_alloc += JOURNAL_PER_BALANCE_CNT;
3360 }
3361 th->t_blocks_logged++;
3362 journal->j_len++;
3363
3364 cn->bh = bh;
3365 cn->blocknr = bh->b_blocknr;
3366 cn->sb = sb;
3367 cn->jlist = NULL;
3368 insert_journal_hash(journal->j_hash_table, cn);
3369 if (!count_already_incd) {
3370 get_bh(bh);
3371 }
3372 }
3373 cn->next = NULL;
3374 cn->prev = journal->j_last;
3375 cn->bh = bh;
3376 if (journal->j_last) {
3377 journal->j_last->next = cn;
3378 journal->j_last = cn;
3379 } else {
3380 journal->j_first = cn;
3381 journal->j_last = cn;
3382 }
3383 reiserfs_schedule_old_flush(sb);
3384 return 0;
3385}
3386
3387int journal_end(struct reiserfs_transaction_handle *th)
3388{
3389 struct super_block *sb = th->t_super;
3390 if (!current->journal_info && th->t_refcount > 1)
3391 reiserfs_warning(sb, "REISER-NESTING",
3392 "th NULL, refcount %d", th->t_refcount);
3393
3394 if (!th->t_trans_id) {
3395 WARN_ON(1);
3396 return -EIO;
3397 }
3398
3399 th->t_refcount--;
3400 if (th->t_refcount > 0) {
3401 struct reiserfs_transaction_handle *cur_th =
3402 current->journal_info;
3403
3404 /*
3405 * we aren't allowed to close a nested transaction on a
3406 * different filesystem from the one in the task struct
3407 */
3408 BUG_ON(cur_th->t_super != th->t_super);
3409
3410 if (th != cur_th) {
3411 memcpy(current->journal_info, th, sizeof(*th));
3412 th->t_trans_id = 0;
3413 }
3414 return 0;
3415 } else {
3416 return do_journal_end(th, 0);
3417 }
3418}
3419
3420/*
3421 * removes from the current transaction, relsing and descrementing any counters.
3422 * also files the removed buffer directly onto the clean list
3423 *
3424 * called by journal_mark_freed when a block has been deleted
3425 *
3426 * returns 1 if it cleaned and relsed the buffer. 0 otherwise
3427 */
3428static int remove_from_transaction(struct super_block *sb,
3429 b_blocknr_t blocknr, int already_cleaned)
3430{
3431 struct buffer_head *bh;
3432 struct reiserfs_journal_cnode *cn;
3433 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3434 int ret = 0;
3435
3436 cn = get_journal_hash_dev(sb, journal->j_hash_table, blocknr);
3437 if (!cn || !cn->bh) {
3438 return ret;
3439 }
3440 bh = cn->bh;
3441 if (cn->prev) {
3442 cn->prev->next = cn->next;
3443 }
3444 if (cn->next) {
3445 cn->next->prev = cn->prev;
3446 }
3447 if (cn == journal->j_first) {
3448 journal->j_first = cn->next;
3449 }
3450 if (cn == journal->j_last) {
3451 journal->j_last = cn->prev;
3452 }
3453 remove_journal_hash(sb, journal->j_hash_table, NULL,
3454 bh->b_blocknr, 0);
3455 clear_buffer_journaled(bh); /* don't log this one */
3456
3457 if (!already_cleaned) {
3458 clear_buffer_journal_dirty(bh);
3459 clear_buffer_dirty(bh);
3460 clear_buffer_journal_test(bh);
3461 put_bh(bh);
3462 if (atomic_read(&bh->b_count) < 0) {
3463 reiserfs_warning(sb, "journal-1752",
3464 "b_count < 0");
3465 }
3466 ret = 1;
3467 }
3468 journal->j_len--;
3469 journal->j_len_alloc--;
3470 free_cnode(sb, cn);
3471 return ret;
3472}
3473
3474/*
3475 * for any cnode in a journal list, it can only be dirtied of all the
3476 * transactions that include it are committed to disk.
3477 * this checks through each transaction, and returns 1 if you are allowed
3478 * to dirty, and 0 if you aren't
3479 *
3480 * it is called by dirty_journal_list, which is called after
3481 * flush_commit_list has gotten all the log blocks for a given
3482 * transaction on disk
3483 *
3484 */
3485static int can_dirty(struct reiserfs_journal_cnode *cn)
3486{
3487 struct super_block *sb = cn->sb;
3488 b_blocknr_t blocknr = cn->blocknr;
3489 struct reiserfs_journal_cnode *cur = cn->hprev;
3490 int can_dirty = 1;
3491
3492 /*
3493 * first test hprev. These are all newer than cn, so any node here
3494 * with the same block number and dev means this node can't be sent
3495 * to disk right now.
3496 */
3497 while (cur && can_dirty) {
3498 if (cur->jlist && cur->bh && cur->blocknr && cur->sb == sb &&
3499 cur->blocknr == blocknr) {
3500 can_dirty = 0;
3501 }
3502 cur = cur->hprev;
3503 }
3504 /*
3505 * then test hnext. These are all older than cn. As long as they
3506 * are committed to the log, it is safe to write cn to disk
3507 */
3508 cur = cn->hnext;
3509 while (cur && can_dirty) {
3510 if (cur->jlist && cur->jlist->j_len > 0 &&
3511 atomic_read(&cur->jlist->j_commit_left) > 0 && cur->bh &&
3512 cur->blocknr && cur->sb == sb && cur->blocknr == blocknr) {
3513 can_dirty = 0;
3514 }
3515 cur = cur->hnext;
3516 }
3517 return can_dirty;
3518}
3519
3520/*
3521 * syncs the commit blocks, but does not force the real buffers to disk
3522 * will wait until the current transaction is done/committed before returning
3523 */
3524int journal_end_sync(struct reiserfs_transaction_handle *th)
3525{
3526 struct super_block *sb = th->t_super;
3527 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3528
3529 BUG_ON(!th->t_trans_id);
3530 /* you can sync while nested, very, very bad */
3531 BUG_ON(th->t_refcount > 1);
3532 if (journal->j_len == 0) {
3533 reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
3534 1);
3535 journal_mark_dirty(th, SB_BUFFER_WITH_SB(sb));
3536 }
3537 return do_journal_end(th, COMMIT_NOW | WAIT);
3538}
3539
3540/* writeback the pending async commits to disk */
3541static void flush_async_commits(struct work_struct *work)
3542{
3543 struct reiserfs_journal *journal =
3544 container_of(work, struct reiserfs_journal, j_work.work);
3545 struct super_block *sb = journal->j_work_sb;
3546 struct reiserfs_journal_list *jl;
3547 struct list_head *entry;
3548
3549 reiserfs_write_lock(sb);
3550 if (!list_empty(&journal->j_journal_list)) {
3551 /* last entry is the youngest, commit it and you get everything */
3552 entry = journal->j_journal_list.prev;
3553 jl = JOURNAL_LIST_ENTRY(entry);
3554 flush_commit_list(sb, jl, 1);
3555 }
3556 reiserfs_write_unlock(sb);
3557}
3558
3559/*
3560 * flushes any old transactions to disk
3561 * ends the current transaction if it is too old
3562 */
3563void reiserfs_flush_old_commits(struct super_block *sb)
3564{
3565 time64_t now;
3566 struct reiserfs_transaction_handle th;
3567 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3568
3569 now = ktime_get_seconds();
3570 /*
3571 * safety check so we don't flush while we are replaying the log during
3572 * mount
3573 */
3574 if (list_empty(&journal->j_journal_list))
3575 return;
3576
3577 /*
3578 * check the current transaction. If there are no writers, and it is
3579 * too old, finish it, and force the commit blocks to disk
3580 */
3581 if (atomic_read(&journal->j_wcount) <= 0 &&
3582 journal->j_trans_start_time > 0 &&
3583 journal->j_len > 0 &&
3584 (now - journal->j_trans_start_time) > journal->j_max_trans_age) {
3585 if (!journal_join(&th, sb)) {
3586 reiserfs_prepare_for_journal(sb,
3587 SB_BUFFER_WITH_SB(sb),
3588 1);
3589 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(sb));
3590
3591 /*
3592 * we're only being called from kreiserfsd, it makes
3593 * no sense to do an async commit so that kreiserfsd
3594 * can do it later
3595 */
3596 do_journal_end(&th, COMMIT_NOW | WAIT);
3597 }
3598 }
3599}
3600
3601/*
3602 * returns 0 if do_journal_end should return right away, returns 1 if
3603 * do_journal_end should finish the commit
3604 *
3605 * if the current transaction is too old, but still has writers, this will
3606 * wait on j_join_wait until all the writers are done. By the time it
3607 * wakes up, the transaction it was called has already ended, so it just
3608 * flushes the commit list and returns 0.
3609 *
3610 * Won't batch when flush or commit_now is set. Also won't batch when
3611 * others are waiting on j_join_wait.
3612 *
3613 * Note, we can't allow the journal_end to proceed while there are still
3614 * writers in the log.
3615 */
3616static int check_journal_end(struct reiserfs_transaction_handle *th, int flags)
3617{
3618
3619 time64_t now;
3620 int flush = flags & FLUSH_ALL;
3621 int commit_now = flags & COMMIT_NOW;
3622 int wait_on_commit = flags & WAIT;
3623 struct reiserfs_journal_list *jl;
3624 struct super_block *sb = th->t_super;
3625 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3626
3627 BUG_ON(!th->t_trans_id);
3628
3629 if (th->t_trans_id != journal->j_trans_id) {
3630 reiserfs_panic(th->t_super, "journal-1577",
3631 "handle trans id %ld != current trans id %ld",
3632 th->t_trans_id, journal->j_trans_id);
3633 }
3634
3635 journal->j_len_alloc -= (th->t_blocks_allocated - th->t_blocks_logged);
3636 /* <= 0 is allowed. unmounting might not call begin */
3637 if (atomic_read(&journal->j_wcount) > 0)
3638 atomic_dec(&journal->j_wcount);
3639
3640 /*
3641 * BUG, deal with case where j_len is 0, but people previously
3642 * freed blocks need to be released will be dealt with by next
3643 * transaction that actually writes something, but should be taken
3644 * care of in this trans
3645 */
3646 BUG_ON(journal->j_len == 0);
3647
3648 /*
3649 * if wcount > 0, and we are called to with flush or commit_now,
3650 * we wait on j_join_wait. We will wake up when the last writer has
3651 * finished the transaction, and started it on its way to the disk.
3652 * Then, we flush the commit or journal list, and just return 0
3653 * because the rest of journal end was already done for this
3654 * transaction.
3655 */
3656 if (atomic_read(&journal->j_wcount) > 0) {
3657 if (flush || commit_now) {
3658 unsigned trans_id;
3659
3660 jl = journal->j_current_jl;
3661 trans_id = jl->j_trans_id;
3662 if (wait_on_commit)
3663 jl->j_state |= LIST_COMMIT_PENDING;
3664 atomic_set(&journal->j_jlock, 1);
3665 if (flush) {
3666 journal->j_next_full_flush = 1;
3667 }
3668 unlock_journal(sb);
3669
3670 /*
3671 * sleep while the current transaction is
3672 * still j_jlocked
3673 */
3674 while (journal->j_trans_id == trans_id) {
3675 if (atomic_read(&journal->j_jlock)) {
3676 queue_log_writer(sb);
3677 } else {
3678 lock_journal(sb);
3679 if (journal->j_trans_id == trans_id) {
3680 atomic_set(&journal->j_jlock,
3681 1);
3682 }
3683 unlock_journal(sb);
3684 }
3685 }
3686 BUG_ON(journal->j_trans_id == trans_id);
3687
3688 if (commit_now
3689 && journal_list_still_alive(sb, trans_id)
3690 && wait_on_commit) {
3691 flush_commit_list(sb, jl, 1);
3692 }
3693 return 0;
3694 }
3695 unlock_journal(sb);
3696 return 0;
3697 }
3698
3699 /* deal with old transactions where we are the last writers */
3700 now = ktime_get_seconds();
3701 if ((now - journal->j_trans_start_time) > journal->j_max_trans_age) {
3702 commit_now = 1;
3703 journal->j_next_async_flush = 1;
3704 }
3705 /* don't batch when someone is waiting on j_join_wait */
3706 /* don't batch when syncing the commit or flushing the whole trans */
3707 if (!(journal->j_must_wait > 0) && !(atomic_read(&journal->j_jlock))
3708 && !flush && !commit_now && (journal->j_len < journal->j_max_batch)
3709 && journal->j_len_alloc < journal->j_max_batch
3710 && journal->j_cnode_free > (journal->j_trans_max * 3)) {
3711 journal->j_bcount++;
3712 unlock_journal(sb);
3713 return 0;
3714 }
3715
3716 if (journal->j_start > SB_ONDISK_JOURNAL_SIZE(sb)) {
3717 reiserfs_panic(sb, "journal-003",
3718 "j_start (%ld) is too high",
3719 journal->j_start);
3720 }
3721 return 1;
3722}
3723
3724/*
3725 * Does all the work that makes deleting blocks safe.
3726 * when deleting a block mark BH_JNew, just remove it from the current
3727 * transaction, clean it's buffer_head and move on.
3728 *
3729 * otherwise:
3730 * set a bit for the block in the journal bitmap. That will prevent it from
3731 * being allocated for unformatted nodes before this transaction has finished.
3732 *
3733 * mark any cnodes for this block as BLOCK_FREED, and clear their bh pointers.
3734 * That will prevent any old transactions with this block from trying to flush
3735 * to the real location. Since we aren't removing the cnode from the
3736 * journal_list_hash, *the block can't be reallocated yet.
3737 *
3738 * Then remove it from the current transaction, decrementing any counters and
3739 * filing it on the clean list.
3740 */
3741int journal_mark_freed(struct reiserfs_transaction_handle *th,
3742 struct super_block *sb, b_blocknr_t blocknr)
3743{
3744 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3745 struct reiserfs_journal_cnode *cn = NULL;
3746 struct buffer_head *bh = NULL;
3747 struct reiserfs_list_bitmap *jb = NULL;
3748 int cleaned = 0;
3749 BUG_ON(!th->t_trans_id);
3750
3751 cn = get_journal_hash_dev(sb, journal->j_hash_table, blocknr);
3752 if (cn && cn->bh) {
3753 bh = cn->bh;
3754 get_bh(bh);
3755 }
3756 /* if it is journal new, we just remove it from this transaction */
3757 if (bh && buffer_journal_new(bh)) {
3758 clear_buffer_journal_new(bh);
3759 clear_prepared_bits(bh);
3760 reiserfs_clean_and_file_buffer(bh);
3761 cleaned = remove_from_transaction(sb, blocknr, cleaned);
3762 } else {
3763 /*
3764 * set the bit for this block in the journal bitmap
3765 * for this transaction
3766 */
3767 jb = journal->j_current_jl->j_list_bitmap;
3768 if (!jb) {
3769 reiserfs_panic(sb, "journal-1702",
3770 "journal_list_bitmap is NULL");
3771 }
3772 set_bit_in_list_bitmap(sb, blocknr, jb);
3773
3774 /* Note, the entire while loop is not allowed to schedule. */
3775
3776 if (bh) {
3777 clear_prepared_bits(bh);
3778 reiserfs_clean_and_file_buffer(bh);
3779 }
3780 cleaned = remove_from_transaction(sb, blocknr, cleaned);
3781
3782 /*
3783 * find all older transactions with this block,
3784 * make sure they don't try to write it out
3785 */
3786 cn = get_journal_hash_dev(sb, journal->j_list_hash_table,
3787 blocknr);
3788 while (cn) {
3789 if (sb == cn->sb && blocknr == cn->blocknr) {
3790 set_bit(BLOCK_FREED, &cn->state);
3791 if (cn->bh) {
3792 /*
3793 * remove_from_transaction will brelse
3794 * the buffer if it was in the current
3795 * trans
3796 */
3797 if (!cleaned) {
3798 clear_buffer_journal_dirty(cn->
3799 bh);
3800 clear_buffer_dirty(cn->bh);
3801 clear_buffer_journal_test(cn->
3802 bh);
3803 cleaned = 1;
3804 put_bh(cn->bh);
3805 if (atomic_read
3806 (&cn->bh->b_count) < 0) {
3807 reiserfs_warning(sb,
3808 "journal-2138",
3809 "cn->bh->b_count < 0");
3810 }
3811 }
3812 /*
3813 * since we are clearing the bh,
3814 * we MUST dec nonzerolen
3815 */
3816 if (cn->jlist) {
3817 atomic_dec(&cn->jlist->
3818 j_nonzerolen);
3819 }
3820 cn->bh = NULL;
3821 }
3822 }
3823 cn = cn->hnext;
3824 }
3825 }
3826
3827 if (bh)
3828 release_buffer_page(bh); /* get_hash grabs the buffer */
3829 return 0;
3830}
3831
3832void reiserfs_update_inode_transaction(struct inode *inode)
3833{
3834 struct reiserfs_journal *journal = SB_JOURNAL(inode->i_sb);
3835 REISERFS_I(inode)->i_jl = journal->j_current_jl;
3836 REISERFS_I(inode)->i_trans_id = journal->j_trans_id;
3837}
3838
3839/*
3840 * returns -1 on error, 0 if no commits/barriers were done and 1
3841 * if a transaction was actually committed and the barrier was done
3842 */
3843static int __commit_trans_jl(struct inode *inode, unsigned long id,
3844 struct reiserfs_journal_list *jl)
3845{
3846 struct reiserfs_transaction_handle th;
3847 struct super_block *sb = inode->i_sb;
3848 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3849 int ret = 0;
3850
3851 /*
3852 * is it from the current transaction,
3853 * or from an unknown transaction?
3854 */
3855 if (id == journal->j_trans_id) {
3856 jl = journal->j_current_jl;
3857 /*
3858 * try to let other writers come in and
3859 * grow this transaction
3860 */
3861 let_transaction_grow(sb, id);
3862 if (journal->j_trans_id != id) {
3863 goto flush_commit_only;
3864 }
3865
3866 ret = journal_begin(&th, sb, 1);
3867 if (ret)
3868 return ret;
3869
3870 /* someone might have ended this transaction while we joined */
3871 if (journal->j_trans_id != id) {
3872 reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
3873 1);
3874 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(sb));
3875 ret = journal_end(&th);
3876 goto flush_commit_only;
3877 }
3878
3879 ret = journal_end_sync(&th);
3880 if (!ret)
3881 ret = 1;
3882
3883 } else {
3884 /*
3885 * this gets tricky, we have to make sure the journal list in
3886 * the inode still exists. We know the list is still around
3887 * if we've got a larger transaction id than the oldest list
3888 */
3889flush_commit_only:
3890 if (journal_list_still_alive(inode->i_sb, id)) {
3891 /*
3892 * we only set ret to 1 when we know for sure
3893 * the barrier hasn't been started yet on the commit
3894 * block.
3895 */
3896 if (atomic_read(&jl->j_commit_left) > 1)
3897 ret = 1;
3898 flush_commit_list(sb, jl, 1);
3899 if (journal->j_errno)
3900 ret = journal->j_errno;
3901 }
3902 }
3903 /* otherwise the list is gone, and long since committed */
3904 return ret;
3905}
3906
3907int reiserfs_commit_for_inode(struct inode *inode)
3908{
3909 unsigned int id = REISERFS_I(inode)->i_trans_id;
3910 struct reiserfs_journal_list *jl = REISERFS_I(inode)->i_jl;
3911
3912 /*
3913 * for the whole inode, assume unset id means it was
3914 * changed in the current transaction. More conservative
3915 */
3916 if (!id || !jl) {
3917 reiserfs_update_inode_transaction(inode);
3918 id = REISERFS_I(inode)->i_trans_id;
3919 /* jl will be updated in __commit_trans_jl */
3920 }
3921
3922 return __commit_trans_jl(inode, id, jl);
3923}
3924
3925void reiserfs_restore_prepared_buffer(struct super_block *sb,
3926 struct buffer_head *bh)
3927{
3928 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3929 PROC_INFO_INC(sb, journal.restore_prepared);
3930 if (!bh) {
3931 return;
3932 }
3933 if (test_clear_buffer_journal_restore_dirty(bh) &&
3934 buffer_journal_dirty(bh)) {
3935 struct reiserfs_journal_cnode *cn;
3936 reiserfs_write_lock(sb);
3937 cn = get_journal_hash_dev(sb,
3938 journal->j_list_hash_table,
3939 bh->b_blocknr);
3940 if (cn && can_dirty(cn)) {
3941 set_buffer_journal_test(bh);
3942 mark_buffer_dirty(bh);
3943 }
3944 reiserfs_write_unlock(sb);
3945 }
3946 clear_buffer_journal_prepared(bh);
3947}
3948
3949extern struct tree_balance *cur_tb;
3950/*
3951 * before we can change a metadata block, we have to make sure it won't
3952 * be written to disk while we are altering it. So, we must:
3953 * clean it
3954 * wait on it.
3955 */
3956int reiserfs_prepare_for_journal(struct super_block *sb,
3957 struct buffer_head *bh, int wait)
3958{
3959 PROC_INFO_INC(sb, journal.prepare);
3960
3961 if (!trylock_buffer(bh)) {
3962 if (!wait)
3963 return 0;
3964 lock_buffer(bh);
3965 }
3966 set_buffer_journal_prepared(bh);
3967 if (test_clear_buffer_dirty(bh) && buffer_journal_dirty(bh)) {
3968 clear_buffer_journal_test(bh);
3969 set_buffer_journal_restore_dirty(bh);
3970 }
3971 unlock_buffer(bh);
3972 return 1;
3973}
3974
3975/*
3976 * long and ugly. If flush, will not return until all commit
3977 * blocks and all real buffers in the trans are on disk.
3978 * If no_async, won't return until all commit blocks are on disk.
3979 *
3980 * keep reading, there are comments as you go along
3981 *
3982 * If the journal is aborted, we just clean up. Things like flushing
3983 * journal lists, etc just won't happen.
3984 */
3985static int do_journal_end(struct reiserfs_transaction_handle *th, int flags)
3986{
3987 struct super_block *sb = th->t_super;
3988 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3989 struct reiserfs_journal_cnode *cn, *next, *jl_cn;
3990 struct reiserfs_journal_cnode *last_cn = NULL;
3991 struct reiserfs_journal_desc *desc;
3992 struct reiserfs_journal_commit *commit;
3993 struct buffer_head *c_bh; /* commit bh */
3994 struct buffer_head *d_bh; /* desc bh */
3995 int cur_write_start = 0; /* start index of current log write */
3996 int i;
3997 int flush;
3998 int wait_on_commit;
3999 struct reiserfs_journal_list *jl, *temp_jl;
4000 struct list_head *entry, *safe;
4001 unsigned long jindex;
4002 unsigned int commit_trans_id;
4003 int trans_half;
4004 int depth;
4005
4006 BUG_ON(th->t_refcount > 1);
4007 BUG_ON(!th->t_trans_id);
4008 BUG_ON(!th->t_super);
4009
4010 /*
4011 * protect flush_older_commits from doing mistakes if the
4012 * transaction ID counter gets overflowed.
4013 */
4014 if (th->t_trans_id == ~0U)
4015 flags |= FLUSH_ALL | COMMIT_NOW | WAIT;
4016 flush = flags & FLUSH_ALL;
4017 wait_on_commit = flags & WAIT;
4018
4019 current->journal_info = th->t_handle_save;
4020 reiserfs_check_lock_depth(sb, "journal end");
4021 if (journal->j_len == 0) {
4022 reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
4023 1);
4024 journal_mark_dirty(th, SB_BUFFER_WITH_SB(sb));
4025 }
4026
4027 lock_journal(sb);
4028 if (journal->j_next_full_flush) {
4029 flags |= FLUSH_ALL;
4030 flush = 1;
4031 }
4032 if (journal->j_next_async_flush) {
4033 flags |= COMMIT_NOW | WAIT;
4034 wait_on_commit = 1;
4035 }
4036
4037 /*
4038 * check_journal_end locks the journal, and unlocks if it does
4039 * not return 1 it tells us if we should continue with the
4040 * journal_end, or just return
4041 */
4042 if (!check_journal_end(th, flags)) {
4043 reiserfs_schedule_old_flush(sb);
4044 wake_queued_writers(sb);
4045 reiserfs_async_progress_wait(sb);
4046 goto out;
4047 }
4048
4049 /* check_journal_end might set these, check again */
4050 if (journal->j_next_full_flush) {
4051 flush = 1;
4052 }
4053
4054 /*
4055 * j must wait means we have to flush the log blocks, and the
4056 * real blocks for this transaction
4057 */
4058 if (journal->j_must_wait > 0) {
4059 flush = 1;
4060 }
4061#ifdef REISERFS_PREALLOCATE
4062 /*
4063 * quota ops might need to nest, setup the journal_info pointer
4064 * for them and raise the refcount so that it is > 0.
4065 */
4066 current->journal_info = th;
4067 th->t_refcount++;
4068
4069 /* it should not involve new blocks into the transaction */
4070 reiserfs_discard_all_prealloc(th);
4071
4072 th->t_refcount--;
4073 current->journal_info = th->t_handle_save;
4074#endif
4075
4076 /* setup description block */
4077 d_bh =
4078 journal_getblk(sb,
4079 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
4080 journal->j_start);
4081 set_buffer_uptodate(d_bh);
4082 desc = (struct reiserfs_journal_desc *)(d_bh)->b_data;
4083 memset(d_bh->b_data, 0, d_bh->b_size);
4084 memcpy(get_journal_desc_magic(d_bh), JOURNAL_DESC_MAGIC, 8);
4085 set_desc_trans_id(desc, journal->j_trans_id);
4086
4087 /*
4088 * setup commit block. Don't write (keep it clean too) this one
4089 * until after everyone else is written
4090 */
4091 c_bh = journal_getblk(sb, SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
4092 ((journal->j_start + journal->j_len +
4093 1) % SB_ONDISK_JOURNAL_SIZE(sb)));
4094 commit = (struct reiserfs_journal_commit *)c_bh->b_data;
4095 memset(c_bh->b_data, 0, c_bh->b_size);
4096 set_commit_trans_id(commit, journal->j_trans_id);
4097 set_buffer_uptodate(c_bh);
4098
4099 /* init this journal list */
4100 jl = journal->j_current_jl;
4101
4102 /*
4103 * we lock the commit before doing anything because
4104 * we want to make sure nobody tries to run flush_commit_list until
4105 * the new transaction is fully setup, and we've already flushed the
4106 * ordered bh list
4107 */
4108 reiserfs_mutex_lock_safe(&jl->j_commit_mutex, sb);
4109
4110 /* save the transaction id in case we need to commit it later */
4111 commit_trans_id = jl->j_trans_id;
4112
4113 atomic_set(&jl->j_older_commits_done, 0);
4114 jl->j_trans_id = journal->j_trans_id;
4115 jl->j_timestamp = journal->j_trans_start_time;
4116 jl->j_commit_bh = c_bh;
4117 jl->j_start = journal->j_start;
4118 jl->j_len = journal->j_len;
4119 atomic_set(&jl->j_nonzerolen, journal->j_len);
4120 atomic_set(&jl->j_commit_left, journal->j_len + 2);
4121 jl->j_realblock = NULL;
4122
4123 /*
4124 * The ENTIRE FOR LOOP MUST not cause schedule to occur.
4125 * for each real block, add it to the journal list hash,
4126 * copy into real block index array in the commit or desc block
4127 */
4128 trans_half = journal_trans_half(sb->s_blocksize);
4129 for (i = 0, cn = journal->j_first; cn; cn = cn->next, i++) {
4130 if (buffer_journaled(cn->bh)) {
4131 jl_cn = get_cnode(sb);
4132 if (!jl_cn) {
4133 reiserfs_panic(sb, "journal-1676",
4134 "get_cnode returned NULL");
4135 }
4136 if (i == 0) {
4137 jl->j_realblock = jl_cn;
4138 }
4139 jl_cn->prev = last_cn;
4140 jl_cn->next = NULL;
4141 if (last_cn) {
4142 last_cn->next = jl_cn;
4143 }
4144 last_cn = jl_cn;
4145 /*
4146 * make sure the block we are trying to log
4147 * is not a block of journal or reserved area
4148 */
4149 if (is_block_in_log_or_reserved_area
4150 (sb, cn->bh->b_blocknr)) {
4151 reiserfs_panic(sb, "journal-2332",
4152 "Trying to log block %lu, "
4153 "which is a log block",
4154 cn->bh->b_blocknr);
4155 }
4156 jl_cn->blocknr = cn->bh->b_blocknr;
4157 jl_cn->state = 0;
4158 jl_cn->sb = sb;
4159 jl_cn->bh = cn->bh;
4160 jl_cn->jlist = jl;
4161 insert_journal_hash(journal->j_list_hash_table, jl_cn);
4162 if (i < trans_half) {
4163 desc->j_realblock[i] =
4164 cpu_to_le32(cn->bh->b_blocknr);
4165 } else {
4166 commit->j_realblock[i - trans_half] =
4167 cpu_to_le32(cn->bh->b_blocknr);
4168 }
4169 } else {
4170 i--;
4171 }
4172 }
4173 set_desc_trans_len(desc, journal->j_len);
4174 set_desc_mount_id(desc, journal->j_mount_id);
4175 set_desc_trans_id(desc, journal->j_trans_id);
4176 set_commit_trans_len(commit, journal->j_len);
4177
4178 /*
4179 * special check in case all buffers in the journal
4180 * were marked for not logging
4181 */
4182 BUG_ON(journal->j_len == 0);
4183
4184 /*
4185 * we're about to dirty all the log blocks, mark the description block
4186 * dirty now too. Don't mark the commit block dirty until all the
4187 * others are on disk
4188 */
4189 mark_buffer_dirty(d_bh);
4190
4191 /*
4192 * first data block is j_start + 1, so add one to
4193 * cur_write_start wherever you use it
4194 */
4195 cur_write_start = journal->j_start;
4196 cn = journal->j_first;
4197 jindex = 1; /* start at one so we don't get the desc again */
4198 while (cn) {
4199 clear_buffer_journal_new(cn->bh);
4200 /* copy all the real blocks into log area. dirty log blocks */
4201 if (buffer_journaled(cn->bh)) {
4202 struct buffer_head *tmp_bh;
4203 char *addr;
4204 struct page *page;
4205 tmp_bh =
4206 journal_getblk(sb,
4207 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
4208 ((cur_write_start +
4209 jindex) %
4210 SB_ONDISK_JOURNAL_SIZE(sb)));
4211 set_buffer_uptodate(tmp_bh);
4212 page = cn->bh->b_page;
4213 addr = kmap(page);
4214 memcpy(tmp_bh->b_data,
4215 addr + offset_in_page(cn->bh->b_data),
4216 cn->bh->b_size);
4217 kunmap(page);
4218 mark_buffer_dirty(tmp_bh);
4219 jindex++;
4220 set_buffer_journal_dirty(cn->bh);
4221 clear_buffer_journaled(cn->bh);
4222 } else {
4223 /*
4224 * JDirty cleared sometime during transaction.
4225 * don't log this one
4226 */
4227 reiserfs_warning(sb, "journal-2048",
4228 "BAD, buffer in journal hash, "
4229 "but not JDirty!");
4230 brelse(cn->bh);
4231 }
4232 next = cn->next;
4233 free_cnode(sb, cn);
4234 cn = next;
4235 reiserfs_cond_resched(sb);
4236 }
4237
4238 /*
4239 * we are done with both the c_bh and d_bh, but
4240 * c_bh must be written after all other commit blocks,
4241 * so we dirty/relse c_bh in flush_commit_list, with commit_left <= 1.
4242 */
4243
4244 journal->j_current_jl = alloc_journal_list(sb);
4245
4246 /* now it is safe to insert this transaction on the main list */
4247 list_add_tail(&jl->j_list, &journal->j_journal_list);
4248 list_add_tail(&jl->j_working_list, &journal->j_working_list);
4249 journal->j_num_work_lists++;
4250
4251 /* reset journal values for the next transaction */
4252 journal->j_start =
4253 (journal->j_start + journal->j_len +
4254 2) % SB_ONDISK_JOURNAL_SIZE(sb);
4255 atomic_set(&journal->j_wcount, 0);
4256 journal->j_bcount = 0;
4257 journal->j_last = NULL;
4258 journal->j_first = NULL;
4259 journal->j_len = 0;
4260 journal->j_trans_start_time = 0;
4261 /* check for trans_id overflow */
4262 if (++journal->j_trans_id == 0)
4263 journal->j_trans_id = 10;
4264 journal->j_current_jl->j_trans_id = journal->j_trans_id;
4265 journal->j_must_wait = 0;
4266 journal->j_len_alloc = 0;
4267 journal->j_next_full_flush = 0;
4268 journal->j_next_async_flush = 0;
4269 init_journal_hash(sb);
4270
4271 /*
4272 * make sure reiserfs_add_jh sees the new current_jl before we
4273 * write out the tails
4274 */
4275 smp_mb();
4276
4277 /*
4278 * tail conversion targets have to hit the disk before we end the
4279 * transaction. Otherwise a later transaction might repack the tail
4280 * before this transaction commits, leaving the data block unflushed
4281 * and clean, if we crash before the later transaction commits, the
4282 * data block is lost.
4283 */
4284 if (!list_empty(&jl->j_tail_bh_list)) {
4285 depth = reiserfs_write_unlock_nested(sb);
4286 write_ordered_buffers(&journal->j_dirty_buffers_lock,
4287 journal, jl, &jl->j_tail_bh_list);
4288 reiserfs_write_lock_nested(sb, depth);
4289 }
4290 BUG_ON(!list_empty(&jl->j_tail_bh_list));
4291 mutex_unlock(&jl->j_commit_mutex);
4292
4293 /*
4294 * honor the flush wishes from the caller, simple commits can
4295 * be done outside the journal lock, they are done below
4296 *
4297 * if we don't flush the commit list right now, we put it into
4298 * the work queue so the people waiting on the async progress work
4299 * queue don't wait for this proc to flush journal lists and such.
4300 */
4301 if (flush) {
4302 flush_commit_list(sb, jl, 1);
4303 flush_journal_list(sb, jl, 1);
4304 } else if (!(jl->j_state & LIST_COMMIT_PENDING)) {
4305 /*
4306 * Avoid queueing work when sb is being shut down. Transaction
4307 * will be flushed on journal shutdown.
4308 */
4309 if (sb->s_flags & SB_ACTIVE)
4310 queue_delayed_work(REISERFS_SB(sb)->commit_wq,
4311 &journal->j_work, HZ / 10);
4312 }
4313
4314 /*
4315 * if the next transaction has any chance of wrapping, flush
4316 * transactions that might get overwritten. If any journal lists
4317 * are very old flush them as well.
4318 */
4319first_jl:
4320 list_for_each_safe(entry, safe, &journal->j_journal_list) {
4321 temp_jl = JOURNAL_LIST_ENTRY(entry);
4322 if (journal->j_start <= temp_jl->j_start) {
4323 if ((journal->j_start + journal->j_trans_max + 1) >=
4324 temp_jl->j_start) {
4325 flush_used_journal_lists(sb, temp_jl);
4326 goto first_jl;
4327 } else if ((journal->j_start +
4328 journal->j_trans_max + 1) <
4329 SB_ONDISK_JOURNAL_SIZE(sb)) {
4330 /*
4331 * if we don't cross into the next
4332 * transaction and we don't wrap, there is
4333 * no way we can overlap any later transactions
4334 * break now
4335 */
4336 break;
4337 }
4338 } else if ((journal->j_start +
4339 journal->j_trans_max + 1) >
4340 SB_ONDISK_JOURNAL_SIZE(sb)) {
4341 if (((journal->j_start + journal->j_trans_max + 1) %
4342 SB_ONDISK_JOURNAL_SIZE(sb)) >=
4343 temp_jl->j_start) {
4344 flush_used_journal_lists(sb, temp_jl);
4345 goto first_jl;
4346 } else {
4347 /*
4348 * we don't overlap anything from out start
4349 * to the end of the log, and our wrapped
4350 * portion doesn't overlap anything at
4351 * the start of the log. We can break
4352 */
4353 break;
4354 }
4355 }
4356 }
4357
4358 journal->j_current_jl->j_list_bitmap =
4359 get_list_bitmap(sb, journal->j_current_jl);
4360
4361 if (!(journal->j_current_jl->j_list_bitmap)) {
4362 reiserfs_panic(sb, "journal-1996",
4363 "could not get a list bitmap");
4364 }
4365
4366 atomic_set(&journal->j_jlock, 0);
4367 unlock_journal(sb);
4368 /* wake up any body waiting to join. */
4369 clear_bit(J_WRITERS_QUEUED, &journal->j_state);
4370 wake_up(&journal->j_join_wait);
4371
4372 if (!flush && wait_on_commit &&
4373 journal_list_still_alive(sb, commit_trans_id)) {
4374 flush_commit_list(sb, jl, 1);
4375 }
4376out:
4377 reiserfs_check_lock_depth(sb, "journal end2");
4378
4379 memset(th, 0, sizeof(*th));
4380 /*
4381 * Re-set th->t_super, so we can properly keep track of how many
4382 * persistent transactions there are. We need to do this so if this
4383 * call is part of a failed restart_transaction, we can free it later
4384 */
4385 th->t_super = sb;
4386
4387 return journal->j_errno;
4388}
4389
4390/* Send the file system read only and refuse new transactions */
4391void reiserfs_abort_journal(struct super_block *sb, int errno)
4392{
4393 struct reiserfs_journal *journal = SB_JOURNAL(sb);
4394 if (test_bit(J_ABORTED, &journal->j_state))
4395 return;
4396
4397 if (!journal->j_errno)
4398 journal->j_errno = errno;
4399
4400 sb->s_flags |= SB_RDONLY;
4401 set_bit(J_ABORTED, &journal->j_state);
4402
4403#ifdef CONFIG_REISERFS_CHECK
4404 dump_stack();
4405#endif
4406}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Write ahead logging implementation copyright Chris Mason 2000
4 *
5 * The background commits make this code very interrelated, and
6 * overly complex. I need to rethink things a bit....The major players:
7 *
8 * journal_begin -- call with the number of blocks you expect to log.
9 * If the current transaction is too
10 * old, it will block until the current transaction is
11 * finished, and then start a new one.
12 * Usually, your transaction will get joined in with
13 * previous ones for speed.
14 *
15 * journal_join -- same as journal_begin, but won't block on the current
16 * transaction regardless of age. Don't ever call
17 * this. Ever. There are only two places it should be
18 * called from, and they are both inside this file.
19 *
20 * journal_mark_dirty -- adds blocks into this transaction. clears any flags
21 * that might make them get sent to disk
22 * and then marks them BH_JDirty. Puts the buffer head
23 * into the current transaction hash.
24 *
25 * journal_end -- if the current transaction is batchable, it does nothing
26 * otherwise, it could do an async/synchronous commit, or
27 * a full flush of all log and real blocks in the
28 * transaction.
29 *
30 * flush_old_commits -- if the current transaction is too old, it is ended and
31 * commit blocks are sent to disk. Forces commit blocks
32 * to disk for all backgrounded commits that have been
33 * around too long.
34 * -- Note, if you call this as an immediate flush from
35 * from within kupdate, it will ignore the immediate flag
36 */
37
38#include <linux/time.h>
39#include <linux/semaphore.h>
40#include <linux/vmalloc.h>
41#include "reiserfs.h"
42#include <linux/kernel.h>
43#include <linux/errno.h>
44#include <linux/fcntl.h>
45#include <linux/stat.h>
46#include <linux/string.h>
47#include <linux/buffer_head.h>
48#include <linux/workqueue.h>
49#include <linux/writeback.h>
50#include <linux/blkdev.h>
51#include <linux/backing-dev.h>
52#include <linux/uaccess.h>
53#include <linux/slab.h>
54
55
56/* gets a struct reiserfs_journal_list * from a list head */
57#define JOURNAL_LIST_ENTRY(h) (list_entry((h), struct reiserfs_journal_list, \
58 j_list))
59#define JOURNAL_WORK_ENTRY(h) (list_entry((h), struct reiserfs_journal_list, \
60 j_working_list))
61
62/* must be correct to keep the desc and commit structs at 4k */
63#define JOURNAL_TRANS_HALF 1018
64#define BUFNR 64 /*read ahead */
65
66/* cnode stat bits. Move these into reiserfs_fs.h */
67
68/* this block was freed, and can't be written. */
69#define BLOCK_FREED 2
70/* this block was freed during this transaction, and can't be written */
71#define BLOCK_FREED_HOLDER 3
72
73/* used in flush_journal_list */
74#define BLOCK_NEEDS_FLUSH 4
75#define BLOCK_DIRTIED 5
76
77/* journal list state bits */
78#define LIST_TOUCHED 1
79#define LIST_DIRTY 2
80#define LIST_COMMIT_PENDING 4 /* someone will commit this list */
81
82/* flags for do_journal_end */
83#define FLUSH_ALL 1 /* flush commit and real blocks */
84#define COMMIT_NOW 2 /* end and commit this transaction */
85#define WAIT 4 /* wait for the log blocks to hit the disk */
86
87static int do_journal_end(struct reiserfs_transaction_handle *, int flags);
88static int flush_journal_list(struct super_block *s,
89 struct reiserfs_journal_list *jl, int flushall);
90static int flush_commit_list(struct super_block *s,
91 struct reiserfs_journal_list *jl, int flushall);
92static int can_dirty(struct reiserfs_journal_cnode *cn);
93static int journal_join(struct reiserfs_transaction_handle *th,
94 struct super_block *sb);
95static void release_journal_dev(struct super_block *super,
96 struct reiserfs_journal *journal);
97static void dirty_one_transaction(struct super_block *s,
98 struct reiserfs_journal_list *jl);
99static void flush_async_commits(struct work_struct *work);
100static void queue_log_writer(struct super_block *s);
101
102/* values for join in do_journal_begin_r */
103enum {
104 JBEGIN_REG = 0, /* regular journal begin */
105 /* join the running transaction if at all possible */
106 JBEGIN_JOIN = 1,
107 /* called from cleanup code, ignores aborted flag */
108 JBEGIN_ABORT = 2,
109};
110
111static int do_journal_begin_r(struct reiserfs_transaction_handle *th,
112 struct super_block *sb,
113 unsigned long nblocks, int join);
114
115static void init_journal_hash(struct super_block *sb)
116{
117 struct reiserfs_journal *journal = SB_JOURNAL(sb);
118 memset(journal->j_hash_table, 0,
119 JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *));
120}
121
122/*
123 * clears BH_Dirty and sticks the buffer on the clean list. Called because
124 * I can't allow refile_buffer to make schedule happen after I've freed a
125 * block. Look at remove_from_transaction and journal_mark_freed for
126 * more details.
127 */
128static int reiserfs_clean_and_file_buffer(struct buffer_head *bh)
129{
130 if (bh) {
131 clear_buffer_dirty(bh);
132 clear_buffer_journal_test(bh);
133 }
134 return 0;
135}
136
137static struct reiserfs_bitmap_node *allocate_bitmap_node(struct super_block
138 *sb)
139{
140 struct reiserfs_bitmap_node *bn;
141 static int id;
142
143 bn = kmalloc(sizeof(struct reiserfs_bitmap_node), GFP_NOFS);
144 if (!bn) {
145 return NULL;
146 }
147 bn->data = kzalloc(sb->s_blocksize, GFP_NOFS);
148 if (!bn->data) {
149 kfree(bn);
150 return NULL;
151 }
152 bn->id = id++;
153 INIT_LIST_HEAD(&bn->list);
154 return bn;
155}
156
157static struct reiserfs_bitmap_node *get_bitmap_node(struct super_block *sb)
158{
159 struct reiserfs_journal *journal = SB_JOURNAL(sb);
160 struct reiserfs_bitmap_node *bn = NULL;
161 struct list_head *entry = journal->j_bitmap_nodes.next;
162
163 journal->j_used_bitmap_nodes++;
164repeat:
165
166 if (entry != &journal->j_bitmap_nodes) {
167 bn = list_entry(entry, struct reiserfs_bitmap_node, list);
168 list_del(entry);
169 memset(bn->data, 0, sb->s_blocksize);
170 journal->j_free_bitmap_nodes--;
171 return bn;
172 }
173 bn = allocate_bitmap_node(sb);
174 if (!bn) {
175 yield();
176 goto repeat;
177 }
178 return bn;
179}
180static inline void free_bitmap_node(struct super_block *sb,
181 struct reiserfs_bitmap_node *bn)
182{
183 struct reiserfs_journal *journal = SB_JOURNAL(sb);
184 journal->j_used_bitmap_nodes--;
185 if (journal->j_free_bitmap_nodes > REISERFS_MAX_BITMAP_NODES) {
186 kfree(bn->data);
187 kfree(bn);
188 } else {
189 list_add(&bn->list, &journal->j_bitmap_nodes);
190 journal->j_free_bitmap_nodes++;
191 }
192}
193
194static void allocate_bitmap_nodes(struct super_block *sb)
195{
196 int i;
197 struct reiserfs_journal *journal = SB_JOURNAL(sb);
198 struct reiserfs_bitmap_node *bn = NULL;
199 for (i = 0; i < REISERFS_MIN_BITMAP_NODES; i++) {
200 bn = allocate_bitmap_node(sb);
201 if (bn) {
202 list_add(&bn->list, &journal->j_bitmap_nodes);
203 journal->j_free_bitmap_nodes++;
204 } else {
205 /* this is ok, we'll try again when more are needed */
206 break;
207 }
208 }
209}
210
211static int set_bit_in_list_bitmap(struct super_block *sb,
212 b_blocknr_t block,
213 struct reiserfs_list_bitmap *jb)
214{
215 unsigned int bmap_nr = block / (sb->s_blocksize << 3);
216 unsigned int bit_nr = block % (sb->s_blocksize << 3);
217
218 if (!jb->bitmaps[bmap_nr]) {
219 jb->bitmaps[bmap_nr] = get_bitmap_node(sb);
220 }
221 set_bit(bit_nr, (unsigned long *)jb->bitmaps[bmap_nr]->data);
222 return 0;
223}
224
225static void cleanup_bitmap_list(struct super_block *sb,
226 struct reiserfs_list_bitmap *jb)
227{
228 int i;
229 if (jb->bitmaps == NULL)
230 return;
231
232 for (i = 0; i < reiserfs_bmap_count(sb); i++) {
233 if (jb->bitmaps[i]) {
234 free_bitmap_node(sb, jb->bitmaps[i]);
235 jb->bitmaps[i] = NULL;
236 }
237 }
238}
239
240/*
241 * only call this on FS unmount.
242 */
243static int free_list_bitmaps(struct super_block *sb,
244 struct reiserfs_list_bitmap *jb_array)
245{
246 int i;
247 struct reiserfs_list_bitmap *jb;
248 for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
249 jb = jb_array + i;
250 jb->journal_list = NULL;
251 cleanup_bitmap_list(sb, jb);
252 vfree(jb->bitmaps);
253 jb->bitmaps = NULL;
254 }
255 return 0;
256}
257
258static int free_bitmap_nodes(struct super_block *sb)
259{
260 struct reiserfs_journal *journal = SB_JOURNAL(sb);
261 struct list_head *next = journal->j_bitmap_nodes.next;
262 struct reiserfs_bitmap_node *bn;
263
264 while (next != &journal->j_bitmap_nodes) {
265 bn = list_entry(next, struct reiserfs_bitmap_node, list);
266 list_del(next);
267 kfree(bn->data);
268 kfree(bn);
269 next = journal->j_bitmap_nodes.next;
270 journal->j_free_bitmap_nodes--;
271 }
272
273 return 0;
274}
275
276/*
277 * get memory for JOURNAL_NUM_BITMAPS worth of bitmaps.
278 * jb_array is the array to be filled in.
279 */
280int reiserfs_allocate_list_bitmaps(struct super_block *sb,
281 struct reiserfs_list_bitmap *jb_array,
282 unsigned int bmap_nr)
283{
284 int i;
285 int failed = 0;
286 struct reiserfs_list_bitmap *jb;
287 int mem = bmap_nr * sizeof(struct reiserfs_bitmap_node *);
288
289 for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
290 jb = jb_array + i;
291 jb->journal_list = NULL;
292 jb->bitmaps = vzalloc(mem);
293 if (!jb->bitmaps) {
294 reiserfs_warning(sb, "clm-2000", "unable to "
295 "allocate bitmaps for journal lists");
296 failed = 1;
297 break;
298 }
299 }
300 if (failed) {
301 free_list_bitmaps(sb, jb_array);
302 return -1;
303 }
304 return 0;
305}
306
307/*
308 * find an available list bitmap. If you can't find one, flush a commit list
309 * and try again
310 */
311static struct reiserfs_list_bitmap *get_list_bitmap(struct super_block *sb,
312 struct reiserfs_journal_list
313 *jl)
314{
315 int i, j;
316 struct reiserfs_journal *journal = SB_JOURNAL(sb);
317 struct reiserfs_list_bitmap *jb = NULL;
318
319 for (j = 0; j < (JOURNAL_NUM_BITMAPS * 3); j++) {
320 i = journal->j_list_bitmap_index;
321 journal->j_list_bitmap_index = (i + 1) % JOURNAL_NUM_BITMAPS;
322 jb = journal->j_list_bitmap + i;
323 if (journal->j_list_bitmap[i].journal_list) {
324 flush_commit_list(sb,
325 journal->j_list_bitmap[i].
326 journal_list, 1);
327 if (!journal->j_list_bitmap[i].journal_list) {
328 break;
329 }
330 } else {
331 break;
332 }
333 }
334 /* double check to make sure if flushed correctly */
335 if (jb->journal_list)
336 return NULL;
337 jb->journal_list = jl;
338 return jb;
339}
340
341/*
342 * allocates a new chunk of X nodes, and links them all together as a list.
343 * Uses the cnode->next and cnode->prev pointers
344 * returns NULL on failure
345 */
346static struct reiserfs_journal_cnode *allocate_cnodes(int num_cnodes)
347{
348 struct reiserfs_journal_cnode *head;
349 int i;
350 if (num_cnodes <= 0) {
351 return NULL;
352 }
353 head = vzalloc(array_size(num_cnodes,
354 sizeof(struct reiserfs_journal_cnode)));
355 if (!head) {
356 return NULL;
357 }
358 head[0].prev = NULL;
359 head[0].next = head + 1;
360 for (i = 1; i < num_cnodes; i++) {
361 head[i].prev = head + (i - 1);
362 head[i].next = head + (i + 1); /* if last one, overwrite it after the if */
363 }
364 head[num_cnodes - 1].next = NULL;
365 return head;
366}
367
368/* pulls a cnode off the free list, or returns NULL on failure */
369static struct reiserfs_journal_cnode *get_cnode(struct super_block *sb)
370{
371 struct reiserfs_journal_cnode *cn;
372 struct reiserfs_journal *journal = SB_JOURNAL(sb);
373
374 reiserfs_check_lock_depth(sb, "get_cnode");
375
376 if (journal->j_cnode_free <= 0) {
377 return NULL;
378 }
379 journal->j_cnode_used++;
380 journal->j_cnode_free--;
381 cn = journal->j_cnode_free_list;
382 if (!cn) {
383 return cn;
384 }
385 if (cn->next) {
386 cn->next->prev = NULL;
387 }
388 journal->j_cnode_free_list = cn->next;
389 memset(cn, 0, sizeof(struct reiserfs_journal_cnode));
390 return cn;
391}
392
393/*
394 * returns a cnode to the free list
395 */
396static void free_cnode(struct super_block *sb,
397 struct reiserfs_journal_cnode *cn)
398{
399 struct reiserfs_journal *journal = SB_JOURNAL(sb);
400
401 reiserfs_check_lock_depth(sb, "free_cnode");
402
403 journal->j_cnode_used--;
404 journal->j_cnode_free++;
405 /* memset(cn, 0, sizeof(struct reiserfs_journal_cnode)) ; */
406 cn->next = journal->j_cnode_free_list;
407 if (journal->j_cnode_free_list) {
408 journal->j_cnode_free_list->prev = cn;
409 }
410 cn->prev = NULL; /* not needed with the memset, but I might kill the memset, and forget to do this */
411 journal->j_cnode_free_list = cn;
412}
413
414static void clear_prepared_bits(struct buffer_head *bh)
415{
416 clear_buffer_journal_prepared(bh);
417 clear_buffer_journal_restore_dirty(bh);
418}
419
420/*
421 * return a cnode with same dev, block number and size in table,
422 * or null if not found
423 */
424static inline struct reiserfs_journal_cnode *get_journal_hash_dev(struct
425 super_block
426 *sb,
427 struct
428 reiserfs_journal_cnode
429 **table,
430 long bl)
431{
432 struct reiserfs_journal_cnode *cn;
433 cn = journal_hash(table, sb, bl);
434 while (cn) {
435 if (cn->blocknr == bl && cn->sb == sb)
436 return cn;
437 cn = cn->hnext;
438 }
439 return (struct reiserfs_journal_cnode *)0;
440}
441
442/*
443 * this actually means 'can this block be reallocated yet?'. If you set
444 * search_all, a block can only be allocated if it is not in the current
445 * transaction, was not freed by the current transaction, and has no chance
446 * of ever being overwritten by a replay after crashing.
447 *
448 * If you don't set search_all, a block can only be allocated if it is not
449 * in the current transaction. Since deleting a block removes it from the
450 * current transaction, this case should never happen. If you don't set
451 * search_all, make sure you never write the block without logging it.
452 *
453 * next_zero_bit is a suggestion about the next block to try for find_forward.
454 * when bl is rejected because it is set in a journal list bitmap, we search
455 * for the next zero bit in the bitmap that rejected bl. Then, we return
456 * that through next_zero_bit for find_forward to try.
457 *
458 * Just because we return something in next_zero_bit does not mean we won't
459 * reject it on the next call to reiserfs_in_journal
460 */
461int reiserfs_in_journal(struct super_block *sb,
462 unsigned int bmap_nr, int bit_nr, int search_all,
463 b_blocknr_t * next_zero_bit)
464{
465 struct reiserfs_journal *journal = SB_JOURNAL(sb);
466 struct reiserfs_journal_cnode *cn;
467 struct reiserfs_list_bitmap *jb;
468 int i;
469 unsigned long bl;
470
471 *next_zero_bit = 0; /* always start this at zero. */
472
473 PROC_INFO_INC(sb, journal.in_journal);
474 /*
475 * If we aren't doing a search_all, this is a metablock, and it
476 * will be logged before use. if we crash before the transaction
477 * that freed it commits, this transaction won't have committed
478 * either, and the block will never be written
479 */
480 if (search_all) {
481 for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
482 PROC_INFO_INC(sb, journal.in_journal_bitmap);
483 jb = journal->j_list_bitmap + i;
484 if (jb->journal_list && jb->bitmaps[bmap_nr] &&
485 test_bit(bit_nr,
486 (unsigned long *)jb->bitmaps[bmap_nr]->
487 data)) {
488 *next_zero_bit =
489 find_next_zero_bit((unsigned long *)
490 (jb->bitmaps[bmap_nr]->
491 data),
492 sb->s_blocksize << 3,
493 bit_nr + 1);
494 return 1;
495 }
496 }
497 }
498
499 bl = bmap_nr * (sb->s_blocksize << 3) + bit_nr;
500 /* is it in any old transactions? */
501 if (search_all
502 && (cn =
503 get_journal_hash_dev(sb, journal->j_list_hash_table, bl))) {
504 return 1;
505 }
506
507 /* is it in the current transaction. This should never happen */
508 if ((cn = get_journal_hash_dev(sb, journal->j_hash_table, bl))) {
509 BUG();
510 return 1;
511 }
512
513 PROC_INFO_INC(sb, journal.in_journal_reusable);
514 /* safe for reuse */
515 return 0;
516}
517
518/* insert cn into table */
519static inline void insert_journal_hash(struct reiserfs_journal_cnode **table,
520 struct reiserfs_journal_cnode *cn)
521{
522 struct reiserfs_journal_cnode *cn_orig;
523
524 cn_orig = journal_hash(table, cn->sb, cn->blocknr);
525 cn->hnext = cn_orig;
526 cn->hprev = NULL;
527 if (cn_orig) {
528 cn_orig->hprev = cn;
529 }
530 journal_hash(table, cn->sb, cn->blocknr) = cn;
531}
532
533/* lock the current transaction */
534static inline void lock_journal(struct super_block *sb)
535{
536 PROC_INFO_INC(sb, journal.lock_journal);
537
538 reiserfs_mutex_lock_safe(&SB_JOURNAL(sb)->j_mutex, sb);
539}
540
541/* unlock the current transaction */
542static inline void unlock_journal(struct super_block *sb)
543{
544 mutex_unlock(&SB_JOURNAL(sb)->j_mutex);
545}
546
547static inline void get_journal_list(struct reiserfs_journal_list *jl)
548{
549 jl->j_refcount++;
550}
551
552static inline void put_journal_list(struct super_block *s,
553 struct reiserfs_journal_list *jl)
554{
555 if (jl->j_refcount < 1) {
556 reiserfs_panic(s, "journal-2", "trans id %u, refcount at %d",
557 jl->j_trans_id, jl->j_refcount);
558 }
559 if (--jl->j_refcount == 0)
560 kfree(jl);
561}
562
563/*
564 * this used to be much more involved, and I'm keeping it just in case
565 * things get ugly again. it gets called by flush_commit_list, and
566 * cleans up any data stored about blocks freed during a transaction.
567 */
568static void cleanup_freed_for_journal_list(struct super_block *sb,
569 struct reiserfs_journal_list *jl)
570{
571
572 struct reiserfs_list_bitmap *jb = jl->j_list_bitmap;
573 if (jb) {
574 cleanup_bitmap_list(sb, jb);
575 }
576 jl->j_list_bitmap->journal_list = NULL;
577 jl->j_list_bitmap = NULL;
578}
579
580static int journal_list_still_alive(struct super_block *s,
581 unsigned int trans_id)
582{
583 struct reiserfs_journal *journal = SB_JOURNAL(s);
584 struct list_head *entry = &journal->j_journal_list;
585 struct reiserfs_journal_list *jl;
586
587 if (!list_empty(entry)) {
588 jl = JOURNAL_LIST_ENTRY(entry->next);
589 if (jl->j_trans_id <= trans_id) {
590 return 1;
591 }
592 }
593 return 0;
594}
595
596/*
597 * If page->mapping was null, we failed to truncate this page for
598 * some reason. Most likely because it was truncated after being
599 * logged via data=journal.
600 *
601 * This does a check to see if the buffer belongs to one of these
602 * lost pages before doing the final put_bh. If page->mapping was
603 * null, it tries to free buffers on the page, which should make the
604 * final put_page drop the page from the lru.
605 */
606static void release_buffer_page(struct buffer_head *bh)
607{
608 struct page *page = bh->b_page;
609 if (!page->mapping && trylock_page(page)) {
610 get_page(page);
611 put_bh(bh);
612 if (!page->mapping)
613 try_to_free_buffers(page);
614 unlock_page(page);
615 put_page(page);
616 } else {
617 put_bh(bh);
618 }
619}
620
621static void reiserfs_end_buffer_io_sync(struct buffer_head *bh, int uptodate)
622{
623 if (buffer_journaled(bh)) {
624 reiserfs_warning(NULL, "clm-2084",
625 "pinned buffer %lu:%pg sent to disk",
626 bh->b_blocknr, bh->b_bdev);
627 }
628 if (uptodate)
629 set_buffer_uptodate(bh);
630 else
631 clear_buffer_uptodate(bh);
632
633 unlock_buffer(bh);
634 release_buffer_page(bh);
635}
636
637static void reiserfs_end_ordered_io(struct buffer_head *bh, int uptodate)
638{
639 if (uptodate)
640 set_buffer_uptodate(bh);
641 else
642 clear_buffer_uptodate(bh);
643 unlock_buffer(bh);
644 put_bh(bh);
645}
646
647static void submit_logged_buffer(struct buffer_head *bh)
648{
649 get_bh(bh);
650 bh->b_end_io = reiserfs_end_buffer_io_sync;
651 clear_buffer_journal_new(bh);
652 clear_buffer_dirty(bh);
653 if (!test_clear_buffer_journal_test(bh))
654 BUG();
655 if (!buffer_uptodate(bh))
656 BUG();
657 submit_bh(REQ_OP_WRITE, 0, bh);
658}
659
660static void submit_ordered_buffer(struct buffer_head *bh)
661{
662 get_bh(bh);
663 bh->b_end_io = reiserfs_end_ordered_io;
664 clear_buffer_dirty(bh);
665 if (!buffer_uptodate(bh))
666 BUG();
667 submit_bh(REQ_OP_WRITE, 0, bh);
668}
669
670#define CHUNK_SIZE 32
671struct buffer_chunk {
672 struct buffer_head *bh[CHUNK_SIZE];
673 int nr;
674};
675
676static void write_chunk(struct buffer_chunk *chunk)
677{
678 int i;
679 for (i = 0; i < chunk->nr; i++) {
680 submit_logged_buffer(chunk->bh[i]);
681 }
682 chunk->nr = 0;
683}
684
685static void write_ordered_chunk(struct buffer_chunk *chunk)
686{
687 int i;
688 for (i = 0; i < chunk->nr; i++) {
689 submit_ordered_buffer(chunk->bh[i]);
690 }
691 chunk->nr = 0;
692}
693
694static int add_to_chunk(struct buffer_chunk *chunk, struct buffer_head *bh,
695 spinlock_t * lock, void (fn) (struct buffer_chunk *))
696{
697 int ret = 0;
698 BUG_ON(chunk->nr >= CHUNK_SIZE);
699 chunk->bh[chunk->nr++] = bh;
700 if (chunk->nr >= CHUNK_SIZE) {
701 ret = 1;
702 if (lock) {
703 spin_unlock(lock);
704 fn(chunk);
705 spin_lock(lock);
706 } else {
707 fn(chunk);
708 }
709 }
710 return ret;
711}
712
713static atomic_t nr_reiserfs_jh = ATOMIC_INIT(0);
714static struct reiserfs_jh *alloc_jh(void)
715{
716 struct reiserfs_jh *jh;
717 while (1) {
718 jh = kmalloc(sizeof(*jh), GFP_NOFS);
719 if (jh) {
720 atomic_inc(&nr_reiserfs_jh);
721 return jh;
722 }
723 yield();
724 }
725}
726
727/*
728 * we want to free the jh when the buffer has been written
729 * and waited on
730 */
731void reiserfs_free_jh(struct buffer_head *bh)
732{
733 struct reiserfs_jh *jh;
734
735 jh = bh->b_private;
736 if (jh) {
737 bh->b_private = NULL;
738 jh->bh = NULL;
739 list_del_init(&jh->list);
740 kfree(jh);
741 if (atomic_read(&nr_reiserfs_jh) <= 0)
742 BUG();
743 atomic_dec(&nr_reiserfs_jh);
744 put_bh(bh);
745 }
746}
747
748static inline int __add_jh(struct reiserfs_journal *j, struct buffer_head *bh,
749 int tail)
750{
751 struct reiserfs_jh *jh;
752
753 if (bh->b_private) {
754 spin_lock(&j->j_dirty_buffers_lock);
755 if (!bh->b_private) {
756 spin_unlock(&j->j_dirty_buffers_lock);
757 goto no_jh;
758 }
759 jh = bh->b_private;
760 list_del_init(&jh->list);
761 } else {
762no_jh:
763 get_bh(bh);
764 jh = alloc_jh();
765 spin_lock(&j->j_dirty_buffers_lock);
766 /*
767 * buffer must be locked for __add_jh, should be able to have
768 * two adds at the same time
769 */
770 BUG_ON(bh->b_private);
771 jh->bh = bh;
772 bh->b_private = jh;
773 }
774 jh->jl = j->j_current_jl;
775 if (tail)
776 list_add_tail(&jh->list, &jh->jl->j_tail_bh_list);
777 else {
778 list_add_tail(&jh->list, &jh->jl->j_bh_list);
779 }
780 spin_unlock(&j->j_dirty_buffers_lock);
781 return 0;
782}
783
784int reiserfs_add_tail_list(struct inode *inode, struct buffer_head *bh)
785{
786 return __add_jh(SB_JOURNAL(inode->i_sb), bh, 1);
787}
788int reiserfs_add_ordered_list(struct inode *inode, struct buffer_head *bh)
789{
790 return __add_jh(SB_JOURNAL(inode->i_sb), bh, 0);
791}
792
793#define JH_ENTRY(l) list_entry((l), struct reiserfs_jh, list)
794static int write_ordered_buffers(spinlock_t * lock,
795 struct reiserfs_journal *j,
796 struct reiserfs_journal_list *jl,
797 struct list_head *list)
798{
799 struct buffer_head *bh;
800 struct reiserfs_jh *jh;
801 int ret = j->j_errno;
802 struct buffer_chunk chunk;
803 struct list_head tmp;
804 INIT_LIST_HEAD(&tmp);
805
806 chunk.nr = 0;
807 spin_lock(lock);
808 while (!list_empty(list)) {
809 jh = JH_ENTRY(list->next);
810 bh = jh->bh;
811 get_bh(bh);
812 if (!trylock_buffer(bh)) {
813 if (!buffer_dirty(bh)) {
814 list_move(&jh->list, &tmp);
815 goto loop_next;
816 }
817 spin_unlock(lock);
818 if (chunk.nr)
819 write_ordered_chunk(&chunk);
820 wait_on_buffer(bh);
821 cond_resched();
822 spin_lock(lock);
823 goto loop_next;
824 }
825 /*
826 * in theory, dirty non-uptodate buffers should never get here,
827 * but the upper layer io error paths still have a few quirks.
828 * Handle them here as gracefully as we can
829 */
830 if (!buffer_uptodate(bh) && buffer_dirty(bh)) {
831 clear_buffer_dirty(bh);
832 ret = -EIO;
833 }
834 if (buffer_dirty(bh)) {
835 list_move(&jh->list, &tmp);
836 add_to_chunk(&chunk, bh, lock, write_ordered_chunk);
837 } else {
838 reiserfs_free_jh(bh);
839 unlock_buffer(bh);
840 }
841loop_next:
842 put_bh(bh);
843 cond_resched_lock(lock);
844 }
845 if (chunk.nr) {
846 spin_unlock(lock);
847 write_ordered_chunk(&chunk);
848 spin_lock(lock);
849 }
850 while (!list_empty(&tmp)) {
851 jh = JH_ENTRY(tmp.prev);
852 bh = jh->bh;
853 get_bh(bh);
854 reiserfs_free_jh(bh);
855
856 if (buffer_locked(bh)) {
857 spin_unlock(lock);
858 wait_on_buffer(bh);
859 spin_lock(lock);
860 }
861 if (!buffer_uptodate(bh)) {
862 ret = -EIO;
863 }
864 /*
865 * ugly interaction with invalidatepage here.
866 * reiserfs_invalidate_page will pin any buffer that has a
867 * valid journal head from an older transaction. If someone
868 * else sets our buffer dirty after we write it in the first
869 * loop, and then someone truncates the page away, nobody
870 * will ever write the buffer. We're safe if we write the
871 * page one last time after freeing the journal header.
872 */
873 if (buffer_dirty(bh) && unlikely(bh->b_page->mapping == NULL)) {
874 spin_unlock(lock);
875 ll_rw_block(REQ_OP_WRITE, 0, 1, &bh);
876 spin_lock(lock);
877 }
878 put_bh(bh);
879 cond_resched_lock(lock);
880 }
881 spin_unlock(lock);
882 return ret;
883}
884
885static int flush_older_commits(struct super_block *s,
886 struct reiserfs_journal_list *jl)
887{
888 struct reiserfs_journal *journal = SB_JOURNAL(s);
889 struct reiserfs_journal_list *other_jl;
890 struct reiserfs_journal_list *first_jl;
891 struct list_head *entry;
892 unsigned int trans_id = jl->j_trans_id;
893 unsigned int other_trans_id;
894
895find_first:
896 /*
897 * first we walk backwards to find the oldest uncommitted transation
898 */
899 first_jl = jl;
900 entry = jl->j_list.prev;
901 while (1) {
902 other_jl = JOURNAL_LIST_ENTRY(entry);
903 if (entry == &journal->j_journal_list ||
904 atomic_read(&other_jl->j_older_commits_done))
905 break;
906
907 first_jl = other_jl;
908 entry = other_jl->j_list.prev;
909 }
910
911 /* if we didn't find any older uncommitted transactions, return now */
912 if (first_jl == jl) {
913 return 0;
914 }
915
916 entry = &first_jl->j_list;
917 while (1) {
918 other_jl = JOURNAL_LIST_ENTRY(entry);
919 other_trans_id = other_jl->j_trans_id;
920
921 if (other_trans_id < trans_id) {
922 if (atomic_read(&other_jl->j_commit_left) != 0) {
923 flush_commit_list(s, other_jl, 0);
924
925 /* list we were called with is gone, return */
926 if (!journal_list_still_alive(s, trans_id))
927 return 1;
928
929 /*
930 * the one we just flushed is gone, this means
931 * all older lists are also gone, so first_jl
932 * is no longer valid either. Go back to the
933 * beginning.
934 */
935 if (!journal_list_still_alive
936 (s, other_trans_id)) {
937 goto find_first;
938 }
939 }
940 entry = entry->next;
941 if (entry == &journal->j_journal_list)
942 return 0;
943 } else {
944 return 0;
945 }
946 }
947 return 0;
948}
949
950static int reiserfs_async_progress_wait(struct super_block *s)
951{
952 struct reiserfs_journal *j = SB_JOURNAL(s);
953
954 if (atomic_read(&j->j_async_throttle)) {
955 int depth;
956
957 depth = reiserfs_write_unlock_nested(s);
958 congestion_wait(BLK_RW_ASYNC, HZ / 10);
959 reiserfs_write_lock_nested(s, depth);
960 }
961
962 return 0;
963}
964
965/*
966 * if this journal list still has commit blocks unflushed, send them to disk.
967 *
968 * log areas must be flushed in order (transaction 2 can't commit before
969 * transaction 1) Before the commit block can by written, every other log
970 * block must be safely on disk
971 */
972static int flush_commit_list(struct super_block *s,
973 struct reiserfs_journal_list *jl, int flushall)
974{
975 int i;
976 b_blocknr_t bn;
977 struct buffer_head *tbh = NULL;
978 unsigned int trans_id = jl->j_trans_id;
979 struct reiserfs_journal *journal = SB_JOURNAL(s);
980 int retval = 0;
981 int write_len;
982 int depth;
983
984 reiserfs_check_lock_depth(s, "flush_commit_list");
985
986 if (atomic_read(&jl->j_older_commits_done)) {
987 return 0;
988 }
989
990 /*
991 * before we can put our commit blocks on disk, we have to make
992 * sure everyone older than us is on disk too
993 */
994 BUG_ON(jl->j_len <= 0);
995 BUG_ON(trans_id == journal->j_trans_id);
996
997 get_journal_list(jl);
998 if (flushall) {
999 if (flush_older_commits(s, jl) == 1) {
1000 /*
1001 * list disappeared during flush_older_commits.
1002 * return
1003 */
1004 goto put_jl;
1005 }
1006 }
1007
1008 /* make sure nobody is trying to flush this one at the same time */
1009 reiserfs_mutex_lock_safe(&jl->j_commit_mutex, s);
1010
1011 if (!journal_list_still_alive(s, trans_id)) {
1012 mutex_unlock(&jl->j_commit_mutex);
1013 goto put_jl;
1014 }
1015 BUG_ON(jl->j_trans_id == 0);
1016
1017 /* this commit is done, exit */
1018 if (atomic_read(&jl->j_commit_left) <= 0) {
1019 if (flushall) {
1020 atomic_set(&jl->j_older_commits_done, 1);
1021 }
1022 mutex_unlock(&jl->j_commit_mutex);
1023 goto put_jl;
1024 }
1025
1026 if (!list_empty(&jl->j_bh_list)) {
1027 int ret;
1028
1029 /*
1030 * We might sleep in numerous places inside
1031 * write_ordered_buffers. Relax the write lock.
1032 */
1033 depth = reiserfs_write_unlock_nested(s);
1034 ret = write_ordered_buffers(&journal->j_dirty_buffers_lock,
1035 journal, jl, &jl->j_bh_list);
1036 if (ret < 0 && retval == 0)
1037 retval = ret;
1038 reiserfs_write_lock_nested(s, depth);
1039 }
1040 BUG_ON(!list_empty(&jl->j_bh_list));
1041 /*
1042 * for the description block and all the log blocks, submit any buffers
1043 * that haven't already reached the disk. Try to write at least 256
1044 * log blocks. later on, we will only wait on blocks that correspond
1045 * to this transaction, but while we're unplugging we might as well
1046 * get a chunk of data on there.
1047 */
1048 atomic_inc(&journal->j_async_throttle);
1049 write_len = jl->j_len + 1;
1050 if (write_len < 256)
1051 write_len = 256;
1052 for (i = 0 ; i < write_len ; i++) {
1053 bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) + (jl->j_start + i) %
1054 SB_ONDISK_JOURNAL_SIZE(s);
1055 tbh = journal_find_get_block(s, bn);
1056 if (tbh) {
1057 if (buffer_dirty(tbh)) {
1058 depth = reiserfs_write_unlock_nested(s);
1059 ll_rw_block(REQ_OP_WRITE, 0, 1, &tbh);
1060 reiserfs_write_lock_nested(s, depth);
1061 }
1062 put_bh(tbh) ;
1063 }
1064 }
1065 atomic_dec(&journal->j_async_throttle);
1066
1067 for (i = 0; i < (jl->j_len + 1); i++) {
1068 bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) +
1069 (jl->j_start + i) % SB_ONDISK_JOURNAL_SIZE(s);
1070 tbh = journal_find_get_block(s, bn);
1071
1072 depth = reiserfs_write_unlock_nested(s);
1073 __wait_on_buffer(tbh);
1074 reiserfs_write_lock_nested(s, depth);
1075 /*
1076 * since we're using ll_rw_blk above, it might have skipped
1077 * over a locked buffer. Double check here
1078 */
1079 /* redundant, sync_dirty_buffer() checks */
1080 if (buffer_dirty(tbh)) {
1081 depth = reiserfs_write_unlock_nested(s);
1082 sync_dirty_buffer(tbh);
1083 reiserfs_write_lock_nested(s, depth);
1084 }
1085 if (unlikely(!buffer_uptodate(tbh))) {
1086#ifdef CONFIG_REISERFS_CHECK
1087 reiserfs_warning(s, "journal-601",
1088 "buffer write failed");
1089#endif
1090 retval = -EIO;
1091 }
1092 /* once for journal_find_get_block */
1093 put_bh(tbh);
1094 /* once due to original getblk in do_journal_end */
1095 put_bh(tbh);
1096 atomic_dec(&jl->j_commit_left);
1097 }
1098
1099 BUG_ON(atomic_read(&jl->j_commit_left) != 1);
1100
1101 /*
1102 * If there was a write error in the journal - we can't commit
1103 * this transaction - it will be invalid and, if successful,
1104 * will just end up propagating the write error out to
1105 * the file system.
1106 */
1107 if (likely(!retval && !reiserfs_is_journal_aborted (journal))) {
1108 if (buffer_dirty(jl->j_commit_bh))
1109 BUG();
1110 mark_buffer_dirty(jl->j_commit_bh) ;
1111 depth = reiserfs_write_unlock_nested(s);
1112 if (reiserfs_barrier_flush(s))
1113 __sync_dirty_buffer(jl->j_commit_bh,
1114 REQ_SYNC | REQ_PREFLUSH | REQ_FUA);
1115 else
1116 sync_dirty_buffer(jl->j_commit_bh);
1117 reiserfs_write_lock_nested(s, depth);
1118 }
1119
1120 /*
1121 * If there was a write error in the journal - we can't commit this
1122 * transaction - it will be invalid and, if successful, will just end
1123 * up propagating the write error out to the filesystem.
1124 */
1125 if (unlikely(!buffer_uptodate(jl->j_commit_bh))) {
1126#ifdef CONFIG_REISERFS_CHECK
1127 reiserfs_warning(s, "journal-615", "buffer write failed");
1128#endif
1129 retval = -EIO;
1130 }
1131 bforget(jl->j_commit_bh);
1132 if (journal->j_last_commit_id != 0 &&
1133 (jl->j_trans_id - journal->j_last_commit_id) != 1) {
1134 reiserfs_warning(s, "clm-2200", "last commit %lu, current %lu",
1135 journal->j_last_commit_id, jl->j_trans_id);
1136 }
1137 journal->j_last_commit_id = jl->j_trans_id;
1138
1139 /*
1140 * now, every commit block is on the disk. It is safe to allow
1141 * blocks freed during this transaction to be reallocated
1142 */
1143 cleanup_freed_for_journal_list(s, jl);
1144
1145 retval = retval ? retval : journal->j_errno;
1146
1147 /* mark the metadata dirty */
1148 if (!retval)
1149 dirty_one_transaction(s, jl);
1150 atomic_dec(&jl->j_commit_left);
1151
1152 if (flushall) {
1153 atomic_set(&jl->j_older_commits_done, 1);
1154 }
1155 mutex_unlock(&jl->j_commit_mutex);
1156put_jl:
1157 put_journal_list(s, jl);
1158
1159 if (retval)
1160 reiserfs_abort(s, retval, "Journal write error in %s",
1161 __func__);
1162 return retval;
1163}
1164
1165/*
1166 * flush_journal_list frequently needs to find a newer transaction for a
1167 * given block. This does that, or returns NULL if it can't find anything
1168 */
1169static struct reiserfs_journal_list *find_newer_jl_for_cn(struct
1170 reiserfs_journal_cnode
1171 *cn)
1172{
1173 struct super_block *sb = cn->sb;
1174 b_blocknr_t blocknr = cn->blocknr;
1175
1176 cn = cn->hprev;
1177 while (cn) {
1178 if (cn->sb == sb && cn->blocknr == blocknr && cn->jlist) {
1179 return cn->jlist;
1180 }
1181 cn = cn->hprev;
1182 }
1183 return NULL;
1184}
1185
1186static void remove_journal_hash(struct super_block *,
1187 struct reiserfs_journal_cnode **,
1188 struct reiserfs_journal_list *, unsigned long,
1189 int);
1190
1191/*
1192 * once all the real blocks have been flushed, it is safe to remove them
1193 * from the journal list for this transaction. Aside from freeing the
1194 * cnode, this also allows the block to be reallocated for data blocks
1195 * if it had been deleted.
1196 */
1197static void remove_all_from_journal_list(struct super_block *sb,
1198 struct reiserfs_journal_list *jl,
1199 int debug)
1200{
1201 struct reiserfs_journal *journal = SB_JOURNAL(sb);
1202 struct reiserfs_journal_cnode *cn, *last;
1203 cn = jl->j_realblock;
1204
1205 /*
1206 * which is better, to lock once around the whole loop, or
1207 * to lock for each call to remove_journal_hash?
1208 */
1209 while (cn) {
1210 if (cn->blocknr != 0) {
1211 if (debug) {
1212 reiserfs_warning(sb, "reiserfs-2201",
1213 "block %u, bh is %d, state %ld",
1214 cn->blocknr, cn->bh ? 1 : 0,
1215 cn->state);
1216 }
1217 cn->state = 0;
1218 remove_journal_hash(sb, journal->j_list_hash_table,
1219 jl, cn->blocknr, 1);
1220 }
1221 last = cn;
1222 cn = cn->next;
1223 free_cnode(sb, last);
1224 }
1225 jl->j_realblock = NULL;
1226}
1227
1228/*
1229 * if this timestamp is greater than the timestamp we wrote last to the
1230 * header block, write it to the header block. once this is done, I can
1231 * safely say the log area for this transaction won't ever be replayed,
1232 * and I can start releasing blocks in this transaction for reuse as data
1233 * blocks. called by flush_journal_list, before it calls
1234 * remove_all_from_journal_list
1235 */
1236static int _update_journal_header_block(struct super_block *sb,
1237 unsigned long offset,
1238 unsigned int trans_id)
1239{
1240 struct reiserfs_journal_header *jh;
1241 struct reiserfs_journal *journal = SB_JOURNAL(sb);
1242 int depth;
1243
1244 if (reiserfs_is_journal_aborted(journal))
1245 return -EIO;
1246
1247 if (trans_id >= journal->j_last_flush_trans_id) {
1248 if (buffer_locked((journal->j_header_bh))) {
1249 depth = reiserfs_write_unlock_nested(sb);
1250 __wait_on_buffer(journal->j_header_bh);
1251 reiserfs_write_lock_nested(sb, depth);
1252 if (unlikely(!buffer_uptodate(journal->j_header_bh))) {
1253#ifdef CONFIG_REISERFS_CHECK
1254 reiserfs_warning(sb, "journal-699",
1255 "buffer write failed");
1256#endif
1257 return -EIO;
1258 }
1259 }
1260 journal->j_last_flush_trans_id = trans_id;
1261 journal->j_first_unflushed_offset = offset;
1262 jh = (struct reiserfs_journal_header *)(journal->j_header_bh->
1263 b_data);
1264 jh->j_last_flush_trans_id = cpu_to_le32(trans_id);
1265 jh->j_first_unflushed_offset = cpu_to_le32(offset);
1266 jh->j_mount_id = cpu_to_le32(journal->j_mount_id);
1267
1268 set_buffer_dirty(journal->j_header_bh);
1269 depth = reiserfs_write_unlock_nested(sb);
1270
1271 if (reiserfs_barrier_flush(sb))
1272 __sync_dirty_buffer(journal->j_header_bh,
1273 REQ_SYNC | REQ_PREFLUSH | REQ_FUA);
1274 else
1275 sync_dirty_buffer(journal->j_header_bh);
1276
1277 reiserfs_write_lock_nested(sb, depth);
1278 if (!buffer_uptodate(journal->j_header_bh)) {
1279 reiserfs_warning(sb, "journal-837",
1280 "IO error during journal replay");
1281 return -EIO;
1282 }
1283 }
1284 return 0;
1285}
1286
1287static int update_journal_header_block(struct super_block *sb,
1288 unsigned long offset,
1289 unsigned int trans_id)
1290{
1291 return _update_journal_header_block(sb, offset, trans_id);
1292}
1293
1294/*
1295** flush any and all journal lists older than you are
1296** can only be called from flush_journal_list
1297*/
1298static int flush_older_journal_lists(struct super_block *sb,
1299 struct reiserfs_journal_list *jl)
1300{
1301 struct list_head *entry;
1302 struct reiserfs_journal_list *other_jl;
1303 struct reiserfs_journal *journal = SB_JOURNAL(sb);
1304 unsigned int trans_id = jl->j_trans_id;
1305
1306 /*
1307 * we know we are the only ones flushing things, no extra race
1308 * protection is required.
1309 */
1310restart:
1311 entry = journal->j_journal_list.next;
1312 /* Did we wrap? */
1313 if (entry == &journal->j_journal_list)
1314 return 0;
1315 other_jl = JOURNAL_LIST_ENTRY(entry);
1316 if (other_jl->j_trans_id < trans_id) {
1317 BUG_ON(other_jl->j_refcount <= 0);
1318 /* do not flush all */
1319 flush_journal_list(sb, other_jl, 0);
1320
1321 /* other_jl is now deleted from the list */
1322 goto restart;
1323 }
1324 return 0;
1325}
1326
1327static void del_from_work_list(struct super_block *s,
1328 struct reiserfs_journal_list *jl)
1329{
1330 struct reiserfs_journal *journal = SB_JOURNAL(s);
1331 if (!list_empty(&jl->j_working_list)) {
1332 list_del_init(&jl->j_working_list);
1333 journal->j_num_work_lists--;
1334 }
1335}
1336
1337/*
1338 * flush a journal list, both commit and real blocks
1339 *
1340 * always set flushall to 1, unless you are calling from inside
1341 * flush_journal_list
1342 *
1343 * IMPORTANT. This can only be called while there are no journal writers,
1344 * and the journal is locked. That means it can only be called from
1345 * do_journal_end, or by journal_release
1346 */
1347static int flush_journal_list(struct super_block *s,
1348 struct reiserfs_journal_list *jl, int flushall)
1349{
1350 struct reiserfs_journal_list *pjl;
1351 struct reiserfs_journal_cnode *cn;
1352 int count;
1353 int was_jwait = 0;
1354 int was_dirty = 0;
1355 struct buffer_head *saved_bh;
1356 unsigned long j_len_saved = jl->j_len;
1357 struct reiserfs_journal *journal = SB_JOURNAL(s);
1358 int err = 0;
1359 int depth;
1360
1361 BUG_ON(j_len_saved <= 0);
1362
1363 if (atomic_read(&journal->j_wcount) != 0) {
1364 reiserfs_warning(s, "clm-2048", "called with wcount %d",
1365 atomic_read(&journal->j_wcount));
1366 }
1367
1368 /* if flushall == 0, the lock is already held */
1369 if (flushall) {
1370 reiserfs_mutex_lock_safe(&journal->j_flush_mutex, s);
1371 } else if (mutex_trylock(&journal->j_flush_mutex)) {
1372 BUG();
1373 }
1374
1375 count = 0;
1376 if (j_len_saved > journal->j_trans_max) {
1377 reiserfs_panic(s, "journal-715", "length is %lu, trans id %lu",
1378 j_len_saved, jl->j_trans_id);
1379 return 0;
1380 }
1381
1382 /* if all the work is already done, get out of here */
1383 if (atomic_read(&jl->j_nonzerolen) <= 0 &&
1384 atomic_read(&jl->j_commit_left) <= 0) {
1385 goto flush_older_and_return;
1386 }
1387
1388 /*
1389 * start by putting the commit list on disk. This will also flush
1390 * the commit lists of any olders transactions
1391 */
1392 flush_commit_list(s, jl, 1);
1393
1394 if (!(jl->j_state & LIST_DIRTY)
1395 && !reiserfs_is_journal_aborted(journal))
1396 BUG();
1397
1398 /* are we done now? */
1399 if (atomic_read(&jl->j_nonzerolen) <= 0 &&
1400 atomic_read(&jl->j_commit_left) <= 0) {
1401 goto flush_older_and_return;
1402 }
1403
1404 /*
1405 * loop through each cnode, see if we need to write it,
1406 * or wait on a more recent transaction, or just ignore it
1407 */
1408 if (atomic_read(&journal->j_wcount) != 0) {
1409 reiserfs_panic(s, "journal-844", "journal list is flushing, "
1410 "wcount is not 0");
1411 }
1412 cn = jl->j_realblock;
1413 while (cn) {
1414 was_jwait = 0;
1415 was_dirty = 0;
1416 saved_bh = NULL;
1417 /* blocknr of 0 is no longer in the hash, ignore it */
1418 if (cn->blocknr == 0) {
1419 goto free_cnode;
1420 }
1421
1422 /*
1423 * This transaction failed commit.
1424 * Don't write out to the disk
1425 */
1426 if (!(jl->j_state & LIST_DIRTY))
1427 goto free_cnode;
1428
1429 pjl = find_newer_jl_for_cn(cn);
1430 /*
1431 * the order is important here. We check pjl to make sure we
1432 * don't clear BH_JDirty_wait if we aren't the one writing this
1433 * block to disk
1434 */
1435 if (!pjl && cn->bh) {
1436 saved_bh = cn->bh;
1437
1438 /*
1439 * we do this to make sure nobody releases the
1440 * buffer while we are working with it
1441 */
1442 get_bh(saved_bh);
1443
1444 if (buffer_journal_dirty(saved_bh)) {
1445 BUG_ON(!can_dirty(cn));
1446 was_jwait = 1;
1447 was_dirty = 1;
1448 } else if (can_dirty(cn)) {
1449 /*
1450 * everything with !pjl && jwait
1451 * should be writable
1452 */
1453 BUG();
1454 }
1455 }
1456
1457 /*
1458 * if someone has this block in a newer transaction, just make
1459 * sure they are committed, and don't try writing it to disk
1460 */
1461 if (pjl) {
1462 if (atomic_read(&pjl->j_commit_left))
1463 flush_commit_list(s, pjl, 1);
1464 goto free_cnode;
1465 }
1466
1467 /*
1468 * bh == NULL when the block got to disk on its own, OR,
1469 * the block got freed in a future transaction
1470 */
1471 if (saved_bh == NULL) {
1472 goto free_cnode;
1473 }
1474
1475 /*
1476 * this should never happen. kupdate_one_transaction has
1477 * this list locked while it works, so we should never see a
1478 * buffer here that is not marked JDirty_wait
1479 */
1480 if ((!was_jwait) && !buffer_locked(saved_bh)) {
1481 reiserfs_warning(s, "journal-813",
1482 "BAD! buffer %llu %cdirty %cjwait, "
1483 "not in a newer transaction",
1484 (unsigned long long)saved_bh->
1485 b_blocknr, was_dirty ? ' ' : '!',
1486 was_jwait ? ' ' : '!');
1487 }
1488 if (was_dirty) {
1489 /*
1490 * we inc again because saved_bh gets decremented
1491 * at free_cnode
1492 */
1493 get_bh(saved_bh);
1494 set_bit(BLOCK_NEEDS_FLUSH, &cn->state);
1495 lock_buffer(saved_bh);
1496 BUG_ON(cn->blocknr != saved_bh->b_blocknr);
1497 if (buffer_dirty(saved_bh))
1498 submit_logged_buffer(saved_bh);
1499 else
1500 unlock_buffer(saved_bh);
1501 count++;
1502 } else {
1503 reiserfs_warning(s, "clm-2082",
1504 "Unable to flush buffer %llu in %s",
1505 (unsigned long long)saved_bh->
1506 b_blocknr, __func__);
1507 }
1508free_cnode:
1509 cn = cn->next;
1510 if (saved_bh) {
1511 /*
1512 * we incremented this to keep others from
1513 * taking the buffer head away
1514 */
1515 put_bh(saved_bh);
1516 if (atomic_read(&saved_bh->b_count) < 0) {
1517 reiserfs_warning(s, "journal-945",
1518 "saved_bh->b_count < 0");
1519 }
1520 }
1521 }
1522 if (count > 0) {
1523 cn = jl->j_realblock;
1524 while (cn) {
1525 if (test_bit(BLOCK_NEEDS_FLUSH, &cn->state)) {
1526 if (!cn->bh) {
1527 reiserfs_panic(s, "journal-1011",
1528 "cn->bh is NULL");
1529 }
1530
1531 depth = reiserfs_write_unlock_nested(s);
1532 __wait_on_buffer(cn->bh);
1533 reiserfs_write_lock_nested(s, depth);
1534
1535 if (!cn->bh) {
1536 reiserfs_panic(s, "journal-1012",
1537 "cn->bh is NULL");
1538 }
1539 if (unlikely(!buffer_uptodate(cn->bh))) {
1540#ifdef CONFIG_REISERFS_CHECK
1541 reiserfs_warning(s, "journal-949",
1542 "buffer write failed");
1543#endif
1544 err = -EIO;
1545 }
1546 /*
1547 * note, we must clear the JDirty_wait bit
1548 * after the up to date check, otherwise we
1549 * race against our flushpage routine
1550 */
1551 BUG_ON(!test_clear_buffer_journal_dirty
1552 (cn->bh));
1553
1554 /* drop one ref for us */
1555 put_bh(cn->bh);
1556 /* drop one ref for journal_mark_dirty */
1557 release_buffer_page(cn->bh);
1558 }
1559 cn = cn->next;
1560 }
1561 }
1562
1563 if (err)
1564 reiserfs_abort(s, -EIO,
1565 "Write error while pushing transaction to disk in %s",
1566 __func__);
1567flush_older_and_return:
1568
1569 /*
1570 * before we can update the journal header block, we _must_ flush all
1571 * real blocks from all older transactions to disk. This is because
1572 * once the header block is updated, this transaction will not be
1573 * replayed after a crash
1574 */
1575 if (flushall) {
1576 flush_older_journal_lists(s, jl);
1577 }
1578
1579 err = journal->j_errno;
1580 /*
1581 * before we can remove everything from the hash tables for this
1582 * transaction, we must make sure it can never be replayed
1583 *
1584 * since we are only called from do_journal_end, we know for sure there
1585 * are no allocations going on while we are flushing journal lists. So,
1586 * we only need to update the journal header block for the last list
1587 * being flushed
1588 */
1589 if (!err && flushall) {
1590 err =
1591 update_journal_header_block(s,
1592 (jl->j_start + jl->j_len +
1593 2) % SB_ONDISK_JOURNAL_SIZE(s),
1594 jl->j_trans_id);
1595 if (err)
1596 reiserfs_abort(s, -EIO,
1597 "Write error while updating journal header in %s",
1598 __func__);
1599 }
1600 remove_all_from_journal_list(s, jl, 0);
1601 list_del_init(&jl->j_list);
1602 journal->j_num_lists--;
1603 del_from_work_list(s, jl);
1604
1605 if (journal->j_last_flush_id != 0 &&
1606 (jl->j_trans_id - journal->j_last_flush_id) != 1) {
1607 reiserfs_warning(s, "clm-2201", "last flush %lu, current %lu",
1608 journal->j_last_flush_id, jl->j_trans_id);
1609 }
1610 journal->j_last_flush_id = jl->j_trans_id;
1611
1612 /*
1613 * not strictly required since we are freeing the list, but it should
1614 * help find code using dead lists later on
1615 */
1616 jl->j_len = 0;
1617 atomic_set(&jl->j_nonzerolen, 0);
1618 jl->j_start = 0;
1619 jl->j_realblock = NULL;
1620 jl->j_commit_bh = NULL;
1621 jl->j_trans_id = 0;
1622 jl->j_state = 0;
1623 put_journal_list(s, jl);
1624 if (flushall)
1625 mutex_unlock(&journal->j_flush_mutex);
1626 return err;
1627}
1628
1629static int write_one_transaction(struct super_block *s,
1630 struct reiserfs_journal_list *jl,
1631 struct buffer_chunk *chunk)
1632{
1633 struct reiserfs_journal_cnode *cn;
1634 int ret = 0;
1635
1636 jl->j_state |= LIST_TOUCHED;
1637 del_from_work_list(s, jl);
1638 if (jl->j_len == 0 || atomic_read(&jl->j_nonzerolen) == 0) {
1639 return 0;
1640 }
1641
1642 cn = jl->j_realblock;
1643 while (cn) {
1644 /*
1645 * if the blocknr == 0, this has been cleared from the hash,
1646 * skip it
1647 */
1648 if (cn->blocknr == 0) {
1649 goto next;
1650 }
1651 if (cn->bh && can_dirty(cn) && buffer_dirty(cn->bh)) {
1652 struct buffer_head *tmp_bh;
1653 /*
1654 * we can race against journal_mark_freed when we try
1655 * to lock_buffer(cn->bh), so we have to inc the buffer
1656 * count, and recheck things after locking
1657 */
1658 tmp_bh = cn->bh;
1659 get_bh(tmp_bh);
1660 lock_buffer(tmp_bh);
1661 if (cn->bh && can_dirty(cn) && buffer_dirty(tmp_bh)) {
1662 if (!buffer_journal_dirty(tmp_bh) ||
1663 buffer_journal_prepared(tmp_bh))
1664 BUG();
1665 add_to_chunk(chunk, tmp_bh, NULL, write_chunk);
1666 ret++;
1667 } else {
1668 /* note, cn->bh might be null now */
1669 unlock_buffer(tmp_bh);
1670 }
1671 put_bh(tmp_bh);
1672 }
1673next:
1674 cn = cn->next;
1675 cond_resched();
1676 }
1677 return ret;
1678}
1679
1680/* used by flush_commit_list */
1681static void dirty_one_transaction(struct super_block *s,
1682 struct reiserfs_journal_list *jl)
1683{
1684 struct reiserfs_journal_cnode *cn;
1685 struct reiserfs_journal_list *pjl;
1686
1687 jl->j_state |= LIST_DIRTY;
1688 cn = jl->j_realblock;
1689 while (cn) {
1690 /*
1691 * look for a more recent transaction that logged this
1692 * buffer. Only the most recent transaction with a buffer in
1693 * it is allowed to send that buffer to disk
1694 */
1695 pjl = find_newer_jl_for_cn(cn);
1696 if (!pjl && cn->blocknr && cn->bh
1697 && buffer_journal_dirty(cn->bh)) {
1698 BUG_ON(!can_dirty(cn));
1699 /*
1700 * if the buffer is prepared, it will either be logged
1701 * or restored. If restored, we need to make sure
1702 * it actually gets marked dirty
1703 */
1704 clear_buffer_journal_new(cn->bh);
1705 if (buffer_journal_prepared(cn->bh)) {
1706 set_buffer_journal_restore_dirty(cn->bh);
1707 } else {
1708 set_buffer_journal_test(cn->bh);
1709 mark_buffer_dirty(cn->bh);
1710 }
1711 }
1712 cn = cn->next;
1713 }
1714}
1715
1716static int kupdate_transactions(struct super_block *s,
1717 struct reiserfs_journal_list *jl,
1718 struct reiserfs_journal_list **next_jl,
1719 unsigned int *next_trans_id,
1720 int num_blocks, int num_trans)
1721{
1722 int ret = 0;
1723 int written = 0;
1724 int transactions_flushed = 0;
1725 unsigned int orig_trans_id = jl->j_trans_id;
1726 struct buffer_chunk chunk;
1727 struct list_head *entry;
1728 struct reiserfs_journal *journal = SB_JOURNAL(s);
1729 chunk.nr = 0;
1730
1731 reiserfs_mutex_lock_safe(&journal->j_flush_mutex, s);
1732 if (!journal_list_still_alive(s, orig_trans_id)) {
1733 goto done;
1734 }
1735
1736 /*
1737 * we've got j_flush_mutex held, nobody is going to delete any
1738 * of these lists out from underneath us
1739 */
1740 while ((num_trans && transactions_flushed < num_trans) ||
1741 (!num_trans && written < num_blocks)) {
1742
1743 if (jl->j_len == 0 || (jl->j_state & LIST_TOUCHED) ||
1744 atomic_read(&jl->j_commit_left)
1745 || !(jl->j_state & LIST_DIRTY)) {
1746 del_from_work_list(s, jl);
1747 break;
1748 }
1749 ret = write_one_transaction(s, jl, &chunk);
1750
1751 if (ret < 0)
1752 goto done;
1753 transactions_flushed++;
1754 written += ret;
1755 entry = jl->j_list.next;
1756
1757 /* did we wrap? */
1758 if (entry == &journal->j_journal_list) {
1759 break;
1760 }
1761 jl = JOURNAL_LIST_ENTRY(entry);
1762
1763 /* don't bother with older transactions */
1764 if (jl->j_trans_id <= orig_trans_id)
1765 break;
1766 }
1767 if (chunk.nr) {
1768 write_chunk(&chunk);
1769 }
1770
1771done:
1772 mutex_unlock(&journal->j_flush_mutex);
1773 return ret;
1774}
1775
1776/*
1777 * for o_sync and fsync heavy applications, they tend to use
1778 * all the journa list slots with tiny transactions. These
1779 * trigger lots and lots of calls to update the header block, which
1780 * adds seeks and slows things down.
1781 *
1782 * This function tries to clear out a large chunk of the journal lists
1783 * at once, which makes everything faster since only the newest journal
1784 * list updates the header block
1785 */
1786static int flush_used_journal_lists(struct super_block *s,
1787 struct reiserfs_journal_list *jl)
1788{
1789 unsigned long len = 0;
1790 unsigned long cur_len;
1791 int i;
1792 int limit = 256;
1793 struct reiserfs_journal_list *tjl;
1794 struct reiserfs_journal_list *flush_jl;
1795 unsigned int trans_id;
1796 struct reiserfs_journal *journal = SB_JOURNAL(s);
1797
1798 flush_jl = tjl = jl;
1799
1800 /* in data logging mode, try harder to flush a lot of blocks */
1801 if (reiserfs_data_log(s))
1802 limit = 1024;
1803 /* flush for 256 transactions or limit blocks, whichever comes first */
1804 for (i = 0; i < 256 && len < limit; i++) {
1805 if (atomic_read(&tjl->j_commit_left) ||
1806 tjl->j_trans_id < jl->j_trans_id) {
1807 break;
1808 }
1809 cur_len = atomic_read(&tjl->j_nonzerolen);
1810 if (cur_len > 0) {
1811 tjl->j_state &= ~LIST_TOUCHED;
1812 }
1813 len += cur_len;
1814 flush_jl = tjl;
1815 if (tjl->j_list.next == &journal->j_journal_list)
1816 break;
1817 tjl = JOURNAL_LIST_ENTRY(tjl->j_list.next);
1818 }
1819 get_journal_list(jl);
1820 get_journal_list(flush_jl);
1821
1822 /*
1823 * try to find a group of blocks we can flush across all the
1824 * transactions, but only bother if we've actually spanned
1825 * across multiple lists
1826 */
1827 if (flush_jl != jl)
1828 kupdate_transactions(s, jl, &tjl, &trans_id, len, i);
1829
1830 flush_journal_list(s, flush_jl, 1);
1831 put_journal_list(s, flush_jl);
1832 put_journal_list(s, jl);
1833 return 0;
1834}
1835
1836/*
1837 * removes any nodes in table with name block and dev as bh.
1838 * only touchs the hnext and hprev pointers.
1839 */
1840static void remove_journal_hash(struct super_block *sb,
1841 struct reiserfs_journal_cnode **table,
1842 struct reiserfs_journal_list *jl,
1843 unsigned long block, int remove_freed)
1844{
1845 struct reiserfs_journal_cnode *cur;
1846 struct reiserfs_journal_cnode **head;
1847
1848 head = &(journal_hash(table, sb, block));
1849 if (!head) {
1850 return;
1851 }
1852 cur = *head;
1853 while (cur) {
1854 if (cur->blocknr == block && cur->sb == sb
1855 && (jl == NULL || jl == cur->jlist)
1856 && (!test_bit(BLOCK_FREED, &cur->state) || remove_freed)) {
1857 if (cur->hnext) {
1858 cur->hnext->hprev = cur->hprev;
1859 }
1860 if (cur->hprev) {
1861 cur->hprev->hnext = cur->hnext;
1862 } else {
1863 *head = cur->hnext;
1864 }
1865 cur->blocknr = 0;
1866 cur->sb = NULL;
1867 cur->state = 0;
1868 /*
1869 * anybody who clears the cur->bh will also
1870 * dec the nonzerolen
1871 */
1872 if (cur->bh && cur->jlist)
1873 atomic_dec(&cur->jlist->j_nonzerolen);
1874 cur->bh = NULL;
1875 cur->jlist = NULL;
1876 }
1877 cur = cur->hnext;
1878 }
1879}
1880
1881static void free_journal_ram(struct super_block *sb)
1882{
1883 struct reiserfs_journal *journal = SB_JOURNAL(sb);
1884 kfree(journal->j_current_jl);
1885 journal->j_num_lists--;
1886
1887 vfree(journal->j_cnode_free_orig);
1888 free_list_bitmaps(sb, journal->j_list_bitmap);
1889 free_bitmap_nodes(sb); /* must be after free_list_bitmaps */
1890 if (journal->j_header_bh) {
1891 brelse(journal->j_header_bh);
1892 }
1893 /*
1894 * j_header_bh is on the journal dev, make sure
1895 * not to release the journal dev until we brelse j_header_bh
1896 */
1897 release_journal_dev(sb, journal);
1898 vfree(journal);
1899}
1900
1901/*
1902 * call on unmount. Only set error to 1 if you haven't made your way out
1903 * of read_super() yet. Any other caller must keep error at 0.
1904 */
1905static int do_journal_release(struct reiserfs_transaction_handle *th,
1906 struct super_block *sb, int error)
1907{
1908 struct reiserfs_transaction_handle myth;
1909 struct reiserfs_journal *journal = SB_JOURNAL(sb);
1910
1911 /*
1912 * we only want to flush out transactions if we were
1913 * called with error == 0
1914 */
1915 if (!error && !sb_rdonly(sb)) {
1916 /* end the current trans */
1917 BUG_ON(!th->t_trans_id);
1918 do_journal_end(th, FLUSH_ALL);
1919
1920 /*
1921 * make sure something gets logged to force
1922 * our way into the flush code
1923 */
1924 if (!journal_join(&myth, sb)) {
1925 reiserfs_prepare_for_journal(sb,
1926 SB_BUFFER_WITH_SB(sb),
1927 1);
1928 journal_mark_dirty(&myth, SB_BUFFER_WITH_SB(sb));
1929 do_journal_end(&myth, FLUSH_ALL);
1930 }
1931 }
1932
1933 /* this also catches errors during the do_journal_end above */
1934 if (!error && reiserfs_is_journal_aborted(journal)) {
1935 memset(&myth, 0, sizeof(myth));
1936 if (!journal_join_abort(&myth, sb)) {
1937 reiserfs_prepare_for_journal(sb,
1938 SB_BUFFER_WITH_SB(sb),
1939 1);
1940 journal_mark_dirty(&myth, SB_BUFFER_WITH_SB(sb));
1941 do_journal_end(&myth, FLUSH_ALL);
1942 }
1943 }
1944
1945
1946 /*
1947 * We must release the write lock here because
1948 * the workqueue job (flush_async_commit) needs this lock
1949 */
1950 reiserfs_write_unlock(sb);
1951
1952 /*
1953 * Cancel flushing of old commits. Note that neither of these works
1954 * will be requeued because superblock is being shutdown and doesn't
1955 * have SB_ACTIVE set.
1956 */
1957 reiserfs_cancel_old_flush(sb);
1958 /* wait for all commits to finish */
1959 cancel_delayed_work_sync(&SB_JOURNAL(sb)->j_work);
1960
1961 free_journal_ram(sb);
1962
1963 reiserfs_write_lock(sb);
1964
1965 return 0;
1966}
1967
1968/* * call on unmount. flush all journal trans, release all alloc'd ram */
1969int journal_release(struct reiserfs_transaction_handle *th,
1970 struct super_block *sb)
1971{
1972 return do_journal_release(th, sb, 0);
1973}
1974
1975/* only call from an error condition inside reiserfs_read_super! */
1976int journal_release_error(struct reiserfs_transaction_handle *th,
1977 struct super_block *sb)
1978{
1979 return do_journal_release(th, sb, 1);
1980}
1981
1982/*
1983 * compares description block with commit block.
1984 * returns 1 if they differ, 0 if they are the same
1985 */
1986static int journal_compare_desc_commit(struct super_block *sb,
1987 struct reiserfs_journal_desc *desc,
1988 struct reiserfs_journal_commit *commit)
1989{
1990 if (get_commit_trans_id(commit) != get_desc_trans_id(desc) ||
1991 get_commit_trans_len(commit) != get_desc_trans_len(desc) ||
1992 get_commit_trans_len(commit) > SB_JOURNAL(sb)->j_trans_max ||
1993 get_commit_trans_len(commit) <= 0) {
1994 return 1;
1995 }
1996 return 0;
1997}
1998
1999/*
2000 * returns 0 if it did not find a description block
2001 * returns -1 if it found a corrupt commit block
2002 * returns 1 if both desc and commit were valid
2003 * NOTE: only called during fs mount
2004 */
2005static int journal_transaction_is_valid(struct super_block *sb,
2006 struct buffer_head *d_bh,
2007 unsigned int *oldest_invalid_trans_id,
2008 unsigned long *newest_mount_id)
2009{
2010 struct reiserfs_journal_desc *desc;
2011 struct reiserfs_journal_commit *commit;
2012 struct buffer_head *c_bh;
2013 unsigned long offset;
2014
2015 if (!d_bh)
2016 return 0;
2017
2018 desc = (struct reiserfs_journal_desc *)d_bh->b_data;
2019 if (get_desc_trans_len(desc) > 0
2020 && !memcmp(get_journal_desc_magic(d_bh), JOURNAL_DESC_MAGIC, 8)) {
2021 if (oldest_invalid_trans_id && *oldest_invalid_trans_id
2022 && get_desc_trans_id(desc) > *oldest_invalid_trans_id) {
2023 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2024 "journal-986: transaction "
2025 "is valid returning because trans_id %d is greater than "
2026 "oldest_invalid %lu",
2027 get_desc_trans_id(desc),
2028 *oldest_invalid_trans_id);
2029 return 0;
2030 }
2031 if (newest_mount_id
2032 && *newest_mount_id > get_desc_mount_id(desc)) {
2033 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2034 "journal-1087: transaction "
2035 "is valid returning because mount_id %d is less than "
2036 "newest_mount_id %lu",
2037 get_desc_mount_id(desc),
2038 *newest_mount_id);
2039 return -1;
2040 }
2041 if (get_desc_trans_len(desc) > SB_JOURNAL(sb)->j_trans_max) {
2042 reiserfs_warning(sb, "journal-2018",
2043 "Bad transaction length %d "
2044 "encountered, ignoring transaction",
2045 get_desc_trans_len(desc));
2046 return -1;
2047 }
2048 offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2049
2050 /*
2051 * ok, we have a journal description block,
2052 * let's see if the transaction was valid
2053 */
2054 c_bh =
2055 journal_bread(sb,
2056 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2057 ((offset + get_desc_trans_len(desc) +
2058 1) % SB_ONDISK_JOURNAL_SIZE(sb)));
2059 if (!c_bh)
2060 return 0;
2061 commit = (struct reiserfs_journal_commit *)c_bh->b_data;
2062 if (journal_compare_desc_commit(sb, desc, commit)) {
2063 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2064 "journal_transaction_is_valid, commit offset %ld had bad "
2065 "time %d or length %d",
2066 c_bh->b_blocknr -
2067 SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2068 get_commit_trans_id(commit),
2069 get_commit_trans_len(commit));
2070 brelse(c_bh);
2071 if (oldest_invalid_trans_id) {
2072 *oldest_invalid_trans_id =
2073 get_desc_trans_id(desc);
2074 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2075 "journal-1004: "
2076 "transaction_is_valid setting oldest invalid trans_id "
2077 "to %d",
2078 get_desc_trans_id(desc));
2079 }
2080 return -1;
2081 }
2082 brelse(c_bh);
2083 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2084 "journal-1006: found valid "
2085 "transaction start offset %llu, len %d id %d",
2086 d_bh->b_blocknr -
2087 SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2088 get_desc_trans_len(desc),
2089 get_desc_trans_id(desc));
2090 return 1;
2091 } else {
2092 return 0;
2093 }
2094}
2095
2096static void brelse_array(struct buffer_head **heads, int num)
2097{
2098 int i;
2099 for (i = 0; i < num; i++) {
2100 brelse(heads[i]);
2101 }
2102}
2103
2104/*
2105 * given the start, and values for the oldest acceptable transactions,
2106 * this either reads in a replays a transaction, or returns because the
2107 * transaction is invalid, or too old.
2108 * NOTE: only called during fs mount
2109 */
2110static int journal_read_transaction(struct super_block *sb,
2111 unsigned long cur_dblock,
2112 unsigned long oldest_start,
2113 unsigned int oldest_trans_id,
2114 unsigned long newest_mount_id)
2115{
2116 struct reiserfs_journal *journal = SB_JOURNAL(sb);
2117 struct reiserfs_journal_desc *desc;
2118 struct reiserfs_journal_commit *commit;
2119 unsigned int trans_id = 0;
2120 struct buffer_head *c_bh;
2121 struct buffer_head *d_bh;
2122 struct buffer_head **log_blocks = NULL;
2123 struct buffer_head **real_blocks = NULL;
2124 unsigned int trans_offset;
2125 int i;
2126 int trans_half;
2127
2128 d_bh = journal_bread(sb, cur_dblock);
2129 if (!d_bh)
2130 return 1;
2131 desc = (struct reiserfs_journal_desc *)d_bh->b_data;
2132 trans_offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2133 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1037: "
2134 "journal_read_transaction, offset %llu, len %d mount_id %d",
2135 d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2136 get_desc_trans_len(desc), get_desc_mount_id(desc));
2137 if (get_desc_trans_id(desc) < oldest_trans_id) {
2138 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1039: "
2139 "journal_read_trans skipping because %lu is too old",
2140 cur_dblock -
2141 SB_ONDISK_JOURNAL_1st_BLOCK(sb));
2142 brelse(d_bh);
2143 return 1;
2144 }
2145 if (get_desc_mount_id(desc) != newest_mount_id) {
2146 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1146: "
2147 "journal_read_trans skipping because %d is != "
2148 "newest_mount_id %lu", get_desc_mount_id(desc),
2149 newest_mount_id);
2150 brelse(d_bh);
2151 return 1;
2152 }
2153 c_bh = journal_bread(sb, SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2154 ((trans_offset + get_desc_trans_len(desc) + 1) %
2155 SB_ONDISK_JOURNAL_SIZE(sb)));
2156 if (!c_bh) {
2157 brelse(d_bh);
2158 return 1;
2159 }
2160 commit = (struct reiserfs_journal_commit *)c_bh->b_data;
2161 if (journal_compare_desc_commit(sb, desc, commit)) {
2162 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2163 "journal_read_transaction, "
2164 "commit offset %llu had bad time %d or length %d",
2165 c_bh->b_blocknr -
2166 SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2167 get_commit_trans_id(commit),
2168 get_commit_trans_len(commit));
2169 brelse(c_bh);
2170 brelse(d_bh);
2171 return 1;
2172 }
2173
2174 if (bdev_read_only(sb->s_bdev)) {
2175 reiserfs_warning(sb, "clm-2076",
2176 "device is readonly, unable to replay log");
2177 brelse(c_bh);
2178 brelse(d_bh);
2179 return -EROFS;
2180 }
2181
2182 trans_id = get_desc_trans_id(desc);
2183 /*
2184 * now we know we've got a good transaction, and it was
2185 * inside the valid time ranges
2186 */
2187 log_blocks = kmalloc_array(get_desc_trans_len(desc),
2188 sizeof(struct buffer_head *),
2189 GFP_NOFS);
2190 real_blocks = kmalloc_array(get_desc_trans_len(desc),
2191 sizeof(struct buffer_head *),
2192 GFP_NOFS);
2193 if (!log_blocks || !real_blocks) {
2194 brelse(c_bh);
2195 brelse(d_bh);
2196 kfree(log_blocks);
2197 kfree(real_blocks);
2198 reiserfs_warning(sb, "journal-1169",
2199 "kmalloc failed, unable to mount FS");
2200 return -1;
2201 }
2202 /* get all the buffer heads */
2203 trans_half = journal_trans_half(sb->s_blocksize);
2204 for (i = 0; i < get_desc_trans_len(desc); i++) {
2205 log_blocks[i] =
2206 journal_getblk(sb,
2207 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2208 (trans_offset + 1 +
2209 i) % SB_ONDISK_JOURNAL_SIZE(sb));
2210 if (i < trans_half) {
2211 real_blocks[i] =
2212 sb_getblk(sb,
2213 le32_to_cpu(desc->j_realblock[i]));
2214 } else {
2215 real_blocks[i] =
2216 sb_getblk(sb,
2217 le32_to_cpu(commit->
2218 j_realblock[i - trans_half]));
2219 }
2220 if (real_blocks[i]->b_blocknr > SB_BLOCK_COUNT(sb)) {
2221 reiserfs_warning(sb, "journal-1207",
2222 "REPLAY FAILURE fsck required! "
2223 "Block to replay is outside of "
2224 "filesystem");
2225 goto abort_replay;
2226 }
2227 /* make sure we don't try to replay onto log or reserved area */
2228 if (is_block_in_log_or_reserved_area
2229 (sb, real_blocks[i]->b_blocknr)) {
2230 reiserfs_warning(sb, "journal-1204",
2231 "REPLAY FAILURE fsck required! "
2232 "Trying to replay onto a log block");
2233abort_replay:
2234 brelse_array(log_blocks, i);
2235 brelse_array(real_blocks, i);
2236 brelse(c_bh);
2237 brelse(d_bh);
2238 kfree(log_blocks);
2239 kfree(real_blocks);
2240 return -1;
2241 }
2242 }
2243 /* read in the log blocks, memcpy to the corresponding real block */
2244 ll_rw_block(REQ_OP_READ, 0, get_desc_trans_len(desc), log_blocks);
2245 for (i = 0; i < get_desc_trans_len(desc); i++) {
2246
2247 wait_on_buffer(log_blocks[i]);
2248 if (!buffer_uptodate(log_blocks[i])) {
2249 reiserfs_warning(sb, "journal-1212",
2250 "REPLAY FAILURE fsck required! "
2251 "buffer write failed");
2252 brelse_array(log_blocks + i,
2253 get_desc_trans_len(desc) - i);
2254 brelse_array(real_blocks, get_desc_trans_len(desc));
2255 brelse(c_bh);
2256 brelse(d_bh);
2257 kfree(log_blocks);
2258 kfree(real_blocks);
2259 return -1;
2260 }
2261 memcpy(real_blocks[i]->b_data, log_blocks[i]->b_data,
2262 real_blocks[i]->b_size);
2263 set_buffer_uptodate(real_blocks[i]);
2264 brelse(log_blocks[i]);
2265 }
2266 /* flush out the real blocks */
2267 for (i = 0; i < get_desc_trans_len(desc); i++) {
2268 set_buffer_dirty(real_blocks[i]);
2269 write_dirty_buffer(real_blocks[i], 0);
2270 }
2271 for (i = 0; i < get_desc_trans_len(desc); i++) {
2272 wait_on_buffer(real_blocks[i]);
2273 if (!buffer_uptodate(real_blocks[i])) {
2274 reiserfs_warning(sb, "journal-1226",
2275 "REPLAY FAILURE, fsck required! "
2276 "buffer write failed");
2277 brelse_array(real_blocks + i,
2278 get_desc_trans_len(desc) - i);
2279 brelse(c_bh);
2280 brelse(d_bh);
2281 kfree(log_blocks);
2282 kfree(real_blocks);
2283 return -1;
2284 }
2285 brelse(real_blocks[i]);
2286 }
2287 cur_dblock =
2288 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2289 ((trans_offset + get_desc_trans_len(desc) +
2290 2) % SB_ONDISK_JOURNAL_SIZE(sb));
2291 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2292 "journal-1095: setting journal " "start to offset %ld",
2293 cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb));
2294
2295 /*
2296 * init starting values for the first transaction, in case
2297 * this is the last transaction to be replayed.
2298 */
2299 journal->j_start = cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2300 journal->j_last_flush_trans_id = trans_id;
2301 journal->j_trans_id = trans_id + 1;
2302 /* check for trans_id overflow */
2303 if (journal->j_trans_id == 0)
2304 journal->j_trans_id = 10;
2305 brelse(c_bh);
2306 brelse(d_bh);
2307 kfree(log_blocks);
2308 kfree(real_blocks);
2309 return 0;
2310}
2311
2312/*
2313 * This function reads blocks starting from block and to max_block of bufsize
2314 * size (but no more than BUFNR blocks at a time). This proved to improve
2315 * mounting speed on self-rebuilding raid5 arrays at least.
2316 * Right now it is only used from journal code. But later we might use it
2317 * from other places.
2318 * Note: Do not use journal_getblk/sb_getblk functions here!
2319 */
2320static struct buffer_head *reiserfs_breada(struct block_device *dev,
2321 b_blocknr_t block, int bufsize,
2322 b_blocknr_t max_block)
2323{
2324 struct buffer_head *bhlist[BUFNR];
2325 unsigned int blocks = BUFNR;
2326 struct buffer_head *bh;
2327 int i, j;
2328
2329 bh = __getblk(dev, block, bufsize);
2330 if (buffer_uptodate(bh))
2331 return (bh);
2332
2333 if (block + BUFNR > max_block) {
2334 blocks = max_block - block;
2335 }
2336 bhlist[0] = bh;
2337 j = 1;
2338 for (i = 1; i < blocks; i++) {
2339 bh = __getblk(dev, block + i, bufsize);
2340 if (buffer_uptodate(bh)) {
2341 brelse(bh);
2342 break;
2343 } else
2344 bhlist[j++] = bh;
2345 }
2346 ll_rw_block(REQ_OP_READ, 0, j, bhlist);
2347 for (i = 1; i < j; i++)
2348 brelse(bhlist[i]);
2349 bh = bhlist[0];
2350 wait_on_buffer(bh);
2351 if (buffer_uptodate(bh))
2352 return bh;
2353 brelse(bh);
2354 return NULL;
2355}
2356
2357/*
2358 * read and replay the log
2359 * on a clean unmount, the journal header's next unflushed pointer will be
2360 * to an invalid transaction. This tests that before finding all the
2361 * transactions in the log, which makes normal mount times fast.
2362 *
2363 * After a crash, this starts with the next unflushed transaction, and
2364 * replays until it finds one too old, or invalid.
2365 *
2366 * On exit, it sets things up so the first transaction will work correctly.
2367 * NOTE: only called during fs mount
2368 */
2369static int journal_read(struct super_block *sb)
2370{
2371 struct reiserfs_journal *journal = SB_JOURNAL(sb);
2372 struct reiserfs_journal_desc *desc;
2373 unsigned int oldest_trans_id = 0;
2374 unsigned int oldest_invalid_trans_id = 0;
2375 time64_t start;
2376 unsigned long oldest_start = 0;
2377 unsigned long cur_dblock = 0;
2378 unsigned long newest_mount_id = 9;
2379 struct buffer_head *d_bh;
2380 struct reiserfs_journal_header *jh;
2381 int valid_journal_header = 0;
2382 int replay_count = 0;
2383 int continue_replay = 1;
2384 int ret;
2385
2386 cur_dblock = SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2387 reiserfs_info(sb, "checking transaction log (%pg)\n",
2388 journal->j_dev_bd);
2389 start = ktime_get_seconds();
2390
2391 /*
2392 * step 1, read in the journal header block. Check the transaction
2393 * it says is the first unflushed, and if that transaction is not
2394 * valid, replay is done
2395 */
2396 journal->j_header_bh = journal_bread(sb,
2397 SB_ONDISK_JOURNAL_1st_BLOCK(sb)
2398 + SB_ONDISK_JOURNAL_SIZE(sb));
2399 if (!journal->j_header_bh) {
2400 return 1;
2401 }
2402 jh = (struct reiserfs_journal_header *)(journal->j_header_bh->b_data);
2403 if (le32_to_cpu(jh->j_first_unflushed_offset) <
2404 SB_ONDISK_JOURNAL_SIZE(sb)
2405 && le32_to_cpu(jh->j_last_flush_trans_id) > 0) {
2406 oldest_start =
2407 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2408 le32_to_cpu(jh->j_first_unflushed_offset);
2409 oldest_trans_id = le32_to_cpu(jh->j_last_flush_trans_id) + 1;
2410 newest_mount_id = le32_to_cpu(jh->j_mount_id);
2411 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2412 "journal-1153: found in "
2413 "header: first_unflushed_offset %d, last_flushed_trans_id "
2414 "%lu", le32_to_cpu(jh->j_first_unflushed_offset),
2415 le32_to_cpu(jh->j_last_flush_trans_id));
2416 valid_journal_header = 1;
2417
2418 /*
2419 * now, we try to read the first unflushed offset. If it
2420 * is not valid, there is nothing more we can do, and it
2421 * makes no sense to read through the whole log.
2422 */
2423 d_bh =
2424 journal_bread(sb,
2425 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2426 le32_to_cpu(jh->j_first_unflushed_offset));
2427 ret = journal_transaction_is_valid(sb, d_bh, NULL, NULL);
2428 if (!ret) {
2429 continue_replay = 0;
2430 }
2431 brelse(d_bh);
2432 goto start_log_replay;
2433 }
2434
2435 /*
2436 * ok, there are transactions that need to be replayed. start
2437 * with the first log block, find all the valid transactions, and
2438 * pick out the oldest.
2439 */
2440 while (continue_replay
2441 && cur_dblock <
2442 (SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2443 SB_ONDISK_JOURNAL_SIZE(sb))) {
2444 /*
2445 * Note that it is required for blocksize of primary fs
2446 * device and journal device to be the same
2447 */
2448 d_bh =
2449 reiserfs_breada(journal->j_dev_bd, cur_dblock,
2450 sb->s_blocksize,
2451 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2452 SB_ONDISK_JOURNAL_SIZE(sb));
2453 ret =
2454 journal_transaction_is_valid(sb, d_bh,
2455 &oldest_invalid_trans_id,
2456 &newest_mount_id);
2457 if (ret == 1) {
2458 desc = (struct reiserfs_journal_desc *)d_bh->b_data;
2459 if (oldest_start == 0) { /* init all oldest_ values */
2460 oldest_trans_id = get_desc_trans_id(desc);
2461 oldest_start = d_bh->b_blocknr;
2462 newest_mount_id = get_desc_mount_id(desc);
2463 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2464 "journal-1179: Setting "
2465 "oldest_start to offset %llu, trans_id %lu",
2466 oldest_start -
2467 SB_ONDISK_JOURNAL_1st_BLOCK
2468 (sb), oldest_trans_id);
2469 } else if (oldest_trans_id > get_desc_trans_id(desc)) {
2470 /* one we just read was older */
2471 oldest_trans_id = get_desc_trans_id(desc);
2472 oldest_start = d_bh->b_blocknr;
2473 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2474 "journal-1180: Resetting "
2475 "oldest_start to offset %lu, trans_id %lu",
2476 oldest_start -
2477 SB_ONDISK_JOURNAL_1st_BLOCK
2478 (sb), oldest_trans_id);
2479 }
2480 if (newest_mount_id < get_desc_mount_id(desc)) {
2481 newest_mount_id = get_desc_mount_id(desc);
2482 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2483 "journal-1299: Setting "
2484 "newest_mount_id to %d",
2485 get_desc_mount_id(desc));
2486 }
2487 cur_dblock += get_desc_trans_len(desc) + 2;
2488 } else {
2489 cur_dblock++;
2490 }
2491 brelse(d_bh);
2492 }
2493
2494start_log_replay:
2495 cur_dblock = oldest_start;
2496 if (oldest_trans_id) {
2497 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2498 "journal-1206: Starting replay "
2499 "from offset %llu, trans_id %lu",
2500 cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2501 oldest_trans_id);
2502
2503 }
2504 replay_count = 0;
2505 while (continue_replay && oldest_trans_id > 0) {
2506 ret =
2507 journal_read_transaction(sb, cur_dblock, oldest_start,
2508 oldest_trans_id, newest_mount_id);
2509 if (ret < 0) {
2510 return ret;
2511 } else if (ret != 0) {
2512 break;
2513 }
2514 cur_dblock =
2515 SB_ONDISK_JOURNAL_1st_BLOCK(sb) + journal->j_start;
2516 replay_count++;
2517 if (cur_dblock == oldest_start)
2518 break;
2519 }
2520
2521 if (oldest_trans_id == 0) {
2522 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2523 "journal-1225: No valid " "transactions found");
2524 }
2525 /*
2526 * j_start does not get set correctly if we don't replay any
2527 * transactions. if we had a valid journal_header, set j_start
2528 * to the first unflushed transaction value, copy the trans_id
2529 * from the header
2530 */
2531 if (valid_journal_header && replay_count == 0) {
2532 journal->j_start = le32_to_cpu(jh->j_first_unflushed_offset);
2533 journal->j_trans_id =
2534 le32_to_cpu(jh->j_last_flush_trans_id) + 1;
2535 /* check for trans_id overflow */
2536 if (journal->j_trans_id == 0)
2537 journal->j_trans_id = 10;
2538 journal->j_last_flush_trans_id =
2539 le32_to_cpu(jh->j_last_flush_trans_id);
2540 journal->j_mount_id = le32_to_cpu(jh->j_mount_id) + 1;
2541 } else {
2542 journal->j_mount_id = newest_mount_id + 1;
2543 }
2544 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1299: Setting "
2545 "newest_mount_id to %lu", journal->j_mount_id);
2546 journal->j_first_unflushed_offset = journal->j_start;
2547 if (replay_count > 0) {
2548 reiserfs_info(sb,
2549 "replayed %d transactions in %lu seconds\n",
2550 replay_count, ktime_get_seconds() - start);
2551 }
2552 /* needed to satisfy the locking in _update_journal_header_block */
2553 reiserfs_write_lock(sb);
2554 if (!bdev_read_only(sb->s_bdev) &&
2555 _update_journal_header_block(sb, journal->j_start,
2556 journal->j_last_flush_trans_id)) {
2557 reiserfs_write_unlock(sb);
2558 /*
2559 * replay failed, caller must call free_journal_ram and abort
2560 * the mount
2561 */
2562 return -1;
2563 }
2564 reiserfs_write_unlock(sb);
2565 return 0;
2566}
2567
2568static struct reiserfs_journal_list *alloc_journal_list(struct super_block *s)
2569{
2570 struct reiserfs_journal_list *jl;
2571 jl = kzalloc(sizeof(struct reiserfs_journal_list),
2572 GFP_NOFS | __GFP_NOFAIL);
2573 INIT_LIST_HEAD(&jl->j_list);
2574 INIT_LIST_HEAD(&jl->j_working_list);
2575 INIT_LIST_HEAD(&jl->j_tail_bh_list);
2576 INIT_LIST_HEAD(&jl->j_bh_list);
2577 mutex_init(&jl->j_commit_mutex);
2578 SB_JOURNAL(s)->j_num_lists++;
2579 get_journal_list(jl);
2580 return jl;
2581}
2582
2583static void journal_list_init(struct super_block *sb)
2584{
2585 SB_JOURNAL(sb)->j_current_jl = alloc_journal_list(sb);
2586}
2587
2588static void release_journal_dev(struct super_block *super,
2589 struct reiserfs_journal *journal)
2590{
2591 if (journal->j_dev_bd != NULL) {
2592 blkdev_put(journal->j_dev_bd, journal->j_dev_mode);
2593 journal->j_dev_bd = NULL;
2594 }
2595}
2596
2597static int journal_init_dev(struct super_block *super,
2598 struct reiserfs_journal *journal,
2599 const char *jdev_name)
2600{
2601 int result;
2602 dev_t jdev;
2603 fmode_t blkdev_mode = FMODE_READ | FMODE_WRITE | FMODE_EXCL;
2604 char b[BDEVNAME_SIZE];
2605
2606 result = 0;
2607
2608 journal->j_dev_bd = NULL;
2609 jdev = SB_ONDISK_JOURNAL_DEVICE(super) ?
2610 new_decode_dev(SB_ONDISK_JOURNAL_DEVICE(super)) : super->s_dev;
2611
2612 if (bdev_read_only(super->s_bdev))
2613 blkdev_mode = FMODE_READ;
2614
2615 /* there is no "jdev" option and journal is on separate device */
2616 if ((!jdev_name || !jdev_name[0])) {
2617 if (jdev == super->s_dev)
2618 blkdev_mode &= ~FMODE_EXCL;
2619 journal->j_dev_bd = blkdev_get_by_dev(jdev, blkdev_mode,
2620 journal);
2621 journal->j_dev_mode = blkdev_mode;
2622 if (IS_ERR(journal->j_dev_bd)) {
2623 result = PTR_ERR(journal->j_dev_bd);
2624 journal->j_dev_bd = NULL;
2625 reiserfs_warning(super, "sh-458",
2626 "cannot init journal device '%s': %i",
2627 __bdevname(jdev, b), result);
2628 return result;
2629 } else if (jdev != super->s_dev)
2630 set_blocksize(journal->j_dev_bd, super->s_blocksize);
2631
2632 return 0;
2633 }
2634
2635 journal->j_dev_mode = blkdev_mode;
2636 journal->j_dev_bd = blkdev_get_by_path(jdev_name, blkdev_mode, journal);
2637 if (IS_ERR(journal->j_dev_bd)) {
2638 result = PTR_ERR(journal->j_dev_bd);
2639 journal->j_dev_bd = NULL;
2640 reiserfs_warning(super, "sh-457",
2641 "journal_init_dev: Cannot open '%s': %i",
2642 jdev_name, result);
2643 return result;
2644 }
2645
2646 set_blocksize(journal->j_dev_bd, super->s_blocksize);
2647 reiserfs_info(super,
2648 "journal_init_dev: journal device: %pg\n",
2649 journal->j_dev_bd);
2650 return 0;
2651}
2652
2653/*
2654 * When creating/tuning a file system user can assign some
2655 * journal params within boundaries which depend on the ratio
2656 * blocksize/standard_blocksize.
2657 *
2658 * For blocks >= standard_blocksize transaction size should
2659 * be not less then JOURNAL_TRANS_MIN_DEFAULT, and not more
2660 * then JOURNAL_TRANS_MAX_DEFAULT.
2661 *
2662 * For blocks < standard_blocksize these boundaries should be
2663 * decreased proportionally.
2664 */
2665#define REISERFS_STANDARD_BLKSIZE (4096)
2666
2667static int check_advise_trans_params(struct super_block *sb,
2668 struct reiserfs_journal *journal)
2669{
2670 if (journal->j_trans_max) {
2671 /* Non-default journal params. Do sanity check for them. */
2672 int ratio = 1;
2673 if (sb->s_blocksize < REISERFS_STANDARD_BLKSIZE)
2674 ratio = REISERFS_STANDARD_BLKSIZE / sb->s_blocksize;
2675
2676 if (journal->j_trans_max > JOURNAL_TRANS_MAX_DEFAULT / ratio ||
2677 journal->j_trans_max < JOURNAL_TRANS_MIN_DEFAULT / ratio ||
2678 SB_ONDISK_JOURNAL_SIZE(sb) / journal->j_trans_max <
2679 JOURNAL_MIN_RATIO) {
2680 reiserfs_warning(sb, "sh-462",
2681 "bad transaction max size (%u). "
2682 "FSCK?", journal->j_trans_max);
2683 return 1;
2684 }
2685 if (journal->j_max_batch != (journal->j_trans_max) *
2686 JOURNAL_MAX_BATCH_DEFAULT/JOURNAL_TRANS_MAX_DEFAULT) {
2687 reiserfs_warning(sb, "sh-463",
2688 "bad transaction max batch (%u). "
2689 "FSCK?", journal->j_max_batch);
2690 return 1;
2691 }
2692 } else {
2693 /*
2694 * Default journal params.
2695 * The file system was created by old version
2696 * of mkreiserfs, so some fields contain zeros,
2697 * and we need to advise proper values for them
2698 */
2699 if (sb->s_blocksize != REISERFS_STANDARD_BLKSIZE) {
2700 reiserfs_warning(sb, "sh-464", "bad blocksize (%u)",
2701 sb->s_blocksize);
2702 return 1;
2703 }
2704 journal->j_trans_max = JOURNAL_TRANS_MAX_DEFAULT;
2705 journal->j_max_batch = JOURNAL_MAX_BATCH_DEFAULT;
2706 journal->j_max_commit_age = JOURNAL_MAX_COMMIT_AGE;
2707 }
2708 return 0;
2709}
2710
2711/* must be called once on fs mount. calls journal_read for you */
2712int journal_init(struct super_block *sb, const char *j_dev_name,
2713 int old_format, unsigned int commit_max_age)
2714{
2715 int num_cnodes = SB_ONDISK_JOURNAL_SIZE(sb) * 2;
2716 struct buffer_head *bhjh;
2717 struct reiserfs_super_block *rs;
2718 struct reiserfs_journal_header *jh;
2719 struct reiserfs_journal *journal;
2720 struct reiserfs_journal_list *jl;
2721 int ret;
2722
2723 journal = SB_JOURNAL(sb) = vzalloc(sizeof(struct reiserfs_journal));
2724 if (!journal) {
2725 reiserfs_warning(sb, "journal-1256",
2726 "unable to get memory for journal structure");
2727 return 1;
2728 }
2729 INIT_LIST_HEAD(&journal->j_bitmap_nodes);
2730 INIT_LIST_HEAD(&journal->j_prealloc_list);
2731 INIT_LIST_HEAD(&journal->j_working_list);
2732 INIT_LIST_HEAD(&journal->j_journal_list);
2733 journal->j_persistent_trans = 0;
2734 if (reiserfs_allocate_list_bitmaps(sb, journal->j_list_bitmap,
2735 reiserfs_bmap_count(sb)))
2736 goto free_and_return;
2737
2738 allocate_bitmap_nodes(sb);
2739
2740 /* reserved for journal area support */
2741 SB_JOURNAL_1st_RESERVED_BLOCK(sb) = (old_format ?
2742 REISERFS_OLD_DISK_OFFSET_IN_BYTES
2743 / sb->s_blocksize +
2744 reiserfs_bmap_count(sb) +
2745 1 :
2746 REISERFS_DISK_OFFSET_IN_BYTES /
2747 sb->s_blocksize + 2);
2748
2749 /*
2750 * Sanity check to see is the standard journal fitting
2751 * within first bitmap (actual for small blocksizes)
2752 */
2753 if (!SB_ONDISK_JOURNAL_DEVICE(sb) &&
2754 (SB_JOURNAL_1st_RESERVED_BLOCK(sb) +
2755 SB_ONDISK_JOURNAL_SIZE(sb) > sb->s_blocksize * 8)) {
2756 reiserfs_warning(sb, "journal-1393",
2757 "journal does not fit for area addressed "
2758 "by first of bitmap blocks. It starts at "
2759 "%u and its size is %u. Block size %ld",
2760 SB_JOURNAL_1st_RESERVED_BLOCK(sb),
2761 SB_ONDISK_JOURNAL_SIZE(sb),
2762 sb->s_blocksize);
2763 goto free_and_return;
2764 }
2765
2766 if (journal_init_dev(sb, journal, j_dev_name) != 0) {
2767 reiserfs_warning(sb, "sh-462",
2768 "unable to initialize journal device");
2769 goto free_and_return;
2770 }
2771
2772 rs = SB_DISK_SUPER_BLOCK(sb);
2773
2774 /* read journal header */
2775 bhjh = journal_bread(sb,
2776 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2777 SB_ONDISK_JOURNAL_SIZE(sb));
2778 if (!bhjh) {
2779 reiserfs_warning(sb, "sh-459",
2780 "unable to read journal header");
2781 goto free_and_return;
2782 }
2783 jh = (struct reiserfs_journal_header *)(bhjh->b_data);
2784
2785 /* make sure that journal matches to the super block */
2786 if (is_reiserfs_jr(rs)
2787 && (le32_to_cpu(jh->jh_journal.jp_journal_magic) !=
2788 sb_jp_journal_magic(rs))) {
2789 reiserfs_warning(sb, "sh-460",
2790 "journal header magic %x (device %pg) does "
2791 "not match to magic found in super block %x",
2792 jh->jh_journal.jp_journal_magic,
2793 journal->j_dev_bd,
2794 sb_jp_journal_magic(rs));
2795 brelse(bhjh);
2796 goto free_and_return;
2797 }
2798
2799 journal->j_trans_max = le32_to_cpu(jh->jh_journal.jp_journal_trans_max);
2800 journal->j_max_batch = le32_to_cpu(jh->jh_journal.jp_journal_max_batch);
2801 journal->j_max_commit_age =
2802 le32_to_cpu(jh->jh_journal.jp_journal_max_commit_age);
2803 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
2804
2805 if (check_advise_trans_params(sb, journal) != 0)
2806 goto free_and_return;
2807 journal->j_default_max_commit_age = journal->j_max_commit_age;
2808
2809 if (commit_max_age != 0) {
2810 journal->j_max_commit_age = commit_max_age;
2811 journal->j_max_trans_age = commit_max_age;
2812 }
2813
2814 reiserfs_info(sb, "journal params: device %pg, size %u, "
2815 "journal first block %u, max trans len %u, max batch %u, "
2816 "max commit age %u, max trans age %u\n",
2817 journal->j_dev_bd,
2818 SB_ONDISK_JOURNAL_SIZE(sb),
2819 SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2820 journal->j_trans_max,
2821 journal->j_max_batch,
2822 journal->j_max_commit_age, journal->j_max_trans_age);
2823
2824 brelse(bhjh);
2825
2826 journal->j_list_bitmap_index = 0;
2827 journal_list_init(sb);
2828
2829 memset(journal->j_list_hash_table, 0,
2830 JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *));
2831
2832 INIT_LIST_HEAD(&journal->j_dirty_buffers);
2833 spin_lock_init(&journal->j_dirty_buffers_lock);
2834
2835 journal->j_start = 0;
2836 journal->j_len = 0;
2837 journal->j_len_alloc = 0;
2838 atomic_set(&journal->j_wcount, 0);
2839 atomic_set(&journal->j_async_throttle, 0);
2840 journal->j_bcount = 0;
2841 journal->j_trans_start_time = 0;
2842 journal->j_last = NULL;
2843 journal->j_first = NULL;
2844 init_waitqueue_head(&journal->j_join_wait);
2845 mutex_init(&journal->j_mutex);
2846 mutex_init(&journal->j_flush_mutex);
2847
2848 journal->j_trans_id = 10;
2849 journal->j_mount_id = 10;
2850 journal->j_state = 0;
2851 atomic_set(&journal->j_jlock, 0);
2852 journal->j_cnode_free_list = allocate_cnodes(num_cnodes);
2853 journal->j_cnode_free_orig = journal->j_cnode_free_list;
2854 journal->j_cnode_free = journal->j_cnode_free_list ? num_cnodes : 0;
2855 journal->j_cnode_used = 0;
2856 journal->j_must_wait = 0;
2857
2858 if (journal->j_cnode_free == 0) {
2859 reiserfs_warning(sb, "journal-2004", "Journal cnode memory "
2860 "allocation failed (%ld bytes). Journal is "
2861 "too large for available memory. Usually "
2862 "this is due to a journal that is too large.",
2863 sizeof (struct reiserfs_journal_cnode) * num_cnodes);
2864 goto free_and_return;
2865 }
2866
2867 init_journal_hash(sb);
2868 jl = journal->j_current_jl;
2869
2870 /*
2871 * get_list_bitmap() may call flush_commit_list() which
2872 * requires the lock. Calling flush_commit_list() shouldn't happen
2873 * this early but I like to be paranoid.
2874 */
2875 reiserfs_write_lock(sb);
2876 jl->j_list_bitmap = get_list_bitmap(sb, jl);
2877 reiserfs_write_unlock(sb);
2878 if (!jl->j_list_bitmap) {
2879 reiserfs_warning(sb, "journal-2005",
2880 "get_list_bitmap failed for journal list 0");
2881 goto free_and_return;
2882 }
2883
2884 ret = journal_read(sb);
2885 if (ret < 0) {
2886 reiserfs_warning(sb, "reiserfs-2006",
2887 "Replay Failure, unable to mount");
2888 goto free_and_return;
2889 }
2890
2891 INIT_DELAYED_WORK(&journal->j_work, flush_async_commits);
2892 journal->j_work_sb = sb;
2893 return 0;
2894free_and_return:
2895 free_journal_ram(sb);
2896 return 1;
2897}
2898
2899/*
2900 * test for a polite end of the current transaction. Used by file_write,
2901 * and should be used by delete to make sure they don't write more than
2902 * can fit inside a single transaction
2903 */
2904int journal_transaction_should_end(struct reiserfs_transaction_handle *th,
2905 int new_alloc)
2906{
2907 struct reiserfs_journal *journal = SB_JOURNAL(th->t_super);
2908 time64_t now = ktime_get_seconds();
2909 /* cannot restart while nested */
2910 BUG_ON(!th->t_trans_id);
2911 if (th->t_refcount > 1)
2912 return 0;
2913 if (journal->j_must_wait > 0 ||
2914 (journal->j_len_alloc + new_alloc) >= journal->j_max_batch ||
2915 atomic_read(&journal->j_jlock) ||
2916 (now - journal->j_trans_start_time) > journal->j_max_trans_age ||
2917 journal->j_cnode_free < (journal->j_trans_max * 3)) {
2918 return 1;
2919 }
2920
2921 journal->j_len_alloc += new_alloc;
2922 th->t_blocks_allocated += new_alloc ;
2923 return 0;
2924}
2925
2926/* this must be called inside a transaction */
2927void reiserfs_block_writes(struct reiserfs_transaction_handle *th)
2928{
2929 struct reiserfs_journal *journal = SB_JOURNAL(th->t_super);
2930 BUG_ON(!th->t_trans_id);
2931 journal->j_must_wait = 1;
2932 set_bit(J_WRITERS_BLOCKED, &journal->j_state);
2933 return;
2934}
2935
2936/* this must be called without a transaction started */
2937void reiserfs_allow_writes(struct super_block *s)
2938{
2939 struct reiserfs_journal *journal = SB_JOURNAL(s);
2940 clear_bit(J_WRITERS_BLOCKED, &journal->j_state);
2941 wake_up(&journal->j_join_wait);
2942}
2943
2944/* this must be called without a transaction started */
2945void reiserfs_wait_on_write_block(struct super_block *s)
2946{
2947 struct reiserfs_journal *journal = SB_JOURNAL(s);
2948 wait_event(journal->j_join_wait,
2949 !test_bit(J_WRITERS_BLOCKED, &journal->j_state));
2950}
2951
2952static void queue_log_writer(struct super_block *s)
2953{
2954 wait_queue_entry_t wait;
2955 struct reiserfs_journal *journal = SB_JOURNAL(s);
2956 set_bit(J_WRITERS_QUEUED, &journal->j_state);
2957
2958 /*
2959 * we don't want to use wait_event here because
2960 * we only want to wait once.
2961 */
2962 init_waitqueue_entry(&wait, current);
2963 add_wait_queue(&journal->j_join_wait, &wait);
2964 set_current_state(TASK_UNINTERRUPTIBLE);
2965 if (test_bit(J_WRITERS_QUEUED, &journal->j_state)) {
2966 int depth = reiserfs_write_unlock_nested(s);
2967 schedule();
2968 reiserfs_write_lock_nested(s, depth);
2969 }
2970 __set_current_state(TASK_RUNNING);
2971 remove_wait_queue(&journal->j_join_wait, &wait);
2972}
2973
2974static void wake_queued_writers(struct super_block *s)
2975{
2976 struct reiserfs_journal *journal = SB_JOURNAL(s);
2977 if (test_and_clear_bit(J_WRITERS_QUEUED, &journal->j_state))
2978 wake_up(&journal->j_join_wait);
2979}
2980
2981static void let_transaction_grow(struct super_block *sb, unsigned int trans_id)
2982{
2983 struct reiserfs_journal *journal = SB_JOURNAL(sb);
2984 unsigned long bcount = journal->j_bcount;
2985 while (1) {
2986 int depth;
2987
2988 depth = reiserfs_write_unlock_nested(sb);
2989 schedule_timeout_uninterruptible(1);
2990 reiserfs_write_lock_nested(sb, depth);
2991
2992 journal->j_current_jl->j_state |= LIST_COMMIT_PENDING;
2993 while ((atomic_read(&journal->j_wcount) > 0 ||
2994 atomic_read(&journal->j_jlock)) &&
2995 journal->j_trans_id == trans_id) {
2996 queue_log_writer(sb);
2997 }
2998 if (journal->j_trans_id != trans_id)
2999 break;
3000 if (bcount == journal->j_bcount)
3001 break;
3002 bcount = journal->j_bcount;
3003 }
3004}
3005
3006/*
3007 * join == true if you must join an existing transaction.
3008 * join == false if you can deal with waiting for others to finish
3009 *
3010 * this will block until the transaction is joinable. send the number of
3011 * blocks you expect to use in nblocks.
3012*/
3013static int do_journal_begin_r(struct reiserfs_transaction_handle *th,
3014 struct super_block *sb, unsigned long nblocks,
3015 int join)
3016{
3017 time64_t now = ktime_get_seconds();
3018 unsigned int old_trans_id;
3019 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3020 struct reiserfs_transaction_handle myth;
3021 int sched_count = 0;
3022 int retval;
3023 int depth;
3024
3025 reiserfs_check_lock_depth(sb, "journal_begin");
3026 BUG_ON(nblocks > journal->j_trans_max);
3027
3028 PROC_INFO_INC(sb, journal.journal_being);
3029 /* set here for journal_join */
3030 th->t_refcount = 1;
3031 th->t_super = sb;
3032
3033relock:
3034 lock_journal(sb);
3035 if (join != JBEGIN_ABORT && reiserfs_is_journal_aborted(journal)) {
3036 unlock_journal(sb);
3037 retval = journal->j_errno;
3038 goto out_fail;
3039 }
3040 journal->j_bcount++;
3041
3042 if (test_bit(J_WRITERS_BLOCKED, &journal->j_state)) {
3043 unlock_journal(sb);
3044 depth = reiserfs_write_unlock_nested(sb);
3045 reiserfs_wait_on_write_block(sb);
3046 reiserfs_write_lock_nested(sb, depth);
3047 PROC_INFO_INC(sb, journal.journal_relock_writers);
3048 goto relock;
3049 }
3050 now = ktime_get_seconds();
3051
3052 /*
3053 * if there is no room in the journal OR
3054 * if this transaction is too old, and we weren't called joinable,
3055 * wait for it to finish before beginning we don't sleep if there
3056 * aren't other writers
3057 */
3058
3059 if ((!join && journal->j_must_wait > 0) ||
3060 (!join
3061 && (journal->j_len_alloc + nblocks + 2) >= journal->j_max_batch)
3062 || (!join && atomic_read(&journal->j_wcount) > 0
3063 && journal->j_trans_start_time > 0
3064 && (now - journal->j_trans_start_time) >
3065 journal->j_max_trans_age) || (!join
3066 && atomic_read(&journal->j_jlock))
3067 || (!join && journal->j_cnode_free < (journal->j_trans_max * 3))) {
3068
3069 old_trans_id = journal->j_trans_id;
3070 /* allow others to finish this transaction */
3071 unlock_journal(sb);
3072
3073 if (!join && (journal->j_len_alloc + nblocks + 2) >=
3074 journal->j_max_batch &&
3075 ((journal->j_len + nblocks + 2) * 100) <
3076 (journal->j_len_alloc * 75)) {
3077 if (atomic_read(&journal->j_wcount) > 10) {
3078 sched_count++;
3079 queue_log_writer(sb);
3080 goto relock;
3081 }
3082 }
3083 /*
3084 * don't mess with joining the transaction if all we
3085 * have to do is wait for someone else to do a commit
3086 */
3087 if (atomic_read(&journal->j_jlock)) {
3088 while (journal->j_trans_id == old_trans_id &&
3089 atomic_read(&journal->j_jlock)) {
3090 queue_log_writer(sb);
3091 }
3092 goto relock;
3093 }
3094 retval = journal_join(&myth, sb);
3095 if (retval)
3096 goto out_fail;
3097
3098 /* someone might have ended the transaction while we joined */
3099 if (old_trans_id != journal->j_trans_id) {
3100 retval = do_journal_end(&myth, 0);
3101 } else {
3102 retval = do_journal_end(&myth, COMMIT_NOW);
3103 }
3104
3105 if (retval)
3106 goto out_fail;
3107
3108 PROC_INFO_INC(sb, journal.journal_relock_wcount);
3109 goto relock;
3110 }
3111 /* we are the first writer, set trans_id */
3112 if (journal->j_trans_start_time == 0) {
3113 journal->j_trans_start_time = ktime_get_seconds();
3114 }
3115 atomic_inc(&journal->j_wcount);
3116 journal->j_len_alloc += nblocks;
3117 th->t_blocks_logged = 0;
3118 th->t_blocks_allocated = nblocks;
3119 th->t_trans_id = journal->j_trans_id;
3120 unlock_journal(sb);
3121 INIT_LIST_HEAD(&th->t_list);
3122 return 0;
3123
3124out_fail:
3125 memset(th, 0, sizeof(*th));
3126 /*
3127 * Re-set th->t_super, so we can properly keep track of how many
3128 * persistent transactions there are. We need to do this so if this
3129 * call is part of a failed restart_transaction, we can free it later
3130 */
3131 th->t_super = sb;
3132 return retval;
3133}
3134
3135struct reiserfs_transaction_handle *reiserfs_persistent_transaction(struct
3136 super_block
3137 *s,
3138 int nblocks)
3139{
3140 int ret;
3141 struct reiserfs_transaction_handle *th;
3142
3143 /*
3144 * if we're nesting into an existing transaction. It will be
3145 * persistent on its own
3146 */
3147 if (reiserfs_transaction_running(s)) {
3148 th = current->journal_info;
3149 th->t_refcount++;
3150 BUG_ON(th->t_refcount < 2);
3151
3152 return th;
3153 }
3154 th = kmalloc(sizeof(struct reiserfs_transaction_handle), GFP_NOFS);
3155 if (!th)
3156 return NULL;
3157 ret = journal_begin(th, s, nblocks);
3158 if (ret) {
3159 kfree(th);
3160 return NULL;
3161 }
3162
3163 SB_JOURNAL(s)->j_persistent_trans++;
3164 return th;
3165}
3166
3167int reiserfs_end_persistent_transaction(struct reiserfs_transaction_handle *th)
3168{
3169 struct super_block *s = th->t_super;
3170 int ret = 0;
3171 if (th->t_trans_id)
3172 ret = journal_end(th);
3173 else
3174 ret = -EIO;
3175 if (th->t_refcount == 0) {
3176 SB_JOURNAL(s)->j_persistent_trans--;
3177 kfree(th);
3178 }
3179 return ret;
3180}
3181
3182static int journal_join(struct reiserfs_transaction_handle *th,
3183 struct super_block *sb)
3184{
3185 struct reiserfs_transaction_handle *cur_th = current->journal_info;
3186
3187 /*
3188 * this keeps do_journal_end from NULLing out the
3189 * current->journal_info pointer
3190 */
3191 th->t_handle_save = cur_th;
3192 BUG_ON(cur_th && cur_th->t_refcount > 1);
3193 return do_journal_begin_r(th, sb, 1, JBEGIN_JOIN);
3194}
3195
3196int journal_join_abort(struct reiserfs_transaction_handle *th,
3197 struct super_block *sb)
3198{
3199 struct reiserfs_transaction_handle *cur_th = current->journal_info;
3200
3201 /*
3202 * this keeps do_journal_end from NULLing out the
3203 * current->journal_info pointer
3204 */
3205 th->t_handle_save = cur_th;
3206 BUG_ON(cur_th && cur_th->t_refcount > 1);
3207 return do_journal_begin_r(th, sb, 1, JBEGIN_ABORT);
3208}
3209
3210int journal_begin(struct reiserfs_transaction_handle *th,
3211 struct super_block *sb, unsigned long nblocks)
3212{
3213 struct reiserfs_transaction_handle *cur_th = current->journal_info;
3214 int ret;
3215
3216 th->t_handle_save = NULL;
3217 if (cur_th) {
3218 /* we are nesting into the current transaction */
3219 if (cur_th->t_super == sb) {
3220 BUG_ON(!cur_th->t_refcount);
3221 cur_th->t_refcount++;
3222 memcpy(th, cur_th, sizeof(*th));
3223 if (th->t_refcount <= 1)
3224 reiserfs_warning(sb, "reiserfs-2005",
3225 "BAD: refcount <= 1, but "
3226 "journal_info != 0");
3227 return 0;
3228 } else {
3229 /*
3230 * we've ended up with a handle from a different
3231 * filesystem. save it and restore on journal_end.
3232 * This should never really happen...
3233 */
3234 reiserfs_warning(sb, "clm-2100",
3235 "nesting info a different FS");
3236 th->t_handle_save = current->journal_info;
3237 current->journal_info = th;
3238 }
3239 } else {
3240 current->journal_info = th;
3241 }
3242 ret = do_journal_begin_r(th, sb, nblocks, JBEGIN_REG);
3243 BUG_ON(current->journal_info != th);
3244
3245 /*
3246 * I guess this boils down to being the reciprocal of clm-2100 above.
3247 * If do_journal_begin_r fails, we need to put it back, since
3248 * journal_end won't be called to do it. */
3249 if (ret)
3250 current->journal_info = th->t_handle_save;
3251 else
3252 BUG_ON(!th->t_refcount);
3253
3254 return ret;
3255}
3256
3257/*
3258 * puts bh into the current transaction. If it was already there, reorders
3259 * removes the old pointers from the hash, and puts new ones in (to make
3260 * sure replay happen in the right order).
3261 *
3262 * if it was dirty, cleans and files onto the clean list. I can't let it
3263 * be dirty again until the transaction is committed.
3264 *
3265 * if j_len, is bigger than j_len_alloc, it pushes j_len_alloc to 10 + j_len.
3266 */
3267int journal_mark_dirty(struct reiserfs_transaction_handle *th,
3268 struct buffer_head *bh)
3269{
3270 struct super_block *sb = th->t_super;
3271 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3272 struct reiserfs_journal_cnode *cn = NULL;
3273 int count_already_incd = 0;
3274 int prepared = 0;
3275 BUG_ON(!th->t_trans_id);
3276
3277 PROC_INFO_INC(sb, journal.mark_dirty);
3278 if (th->t_trans_id != journal->j_trans_id) {
3279 reiserfs_panic(th->t_super, "journal-1577",
3280 "handle trans id %ld != current trans id %ld",
3281 th->t_trans_id, journal->j_trans_id);
3282 }
3283
3284 prepared = test_clear_buffer_journal_prepared(bh);
3285 clear_buffer_journal_restore_dirty(bh);
3286 /* already in this transaction, we are done */
3287 if (buffer_journaled(bh)) {
3288 PROC_INFO_INC(sb, journal.mark_dirty_already);
3289 return 0;
3290 }
3291
3292 /*
3293 * this must be turned into a panic instead of a warning. We can't
3294 * allow a dirty or journal_dirty or locked buffer to be logged, as
3295 * some changes could get to disk too early. NOT GOOD.
3296 */
3297 if (!prepared || buffer_dirty(bh)) {
3298 reiserfs_warning(sb, "journal-1777",
3299 "buffer %llu bad state "
3300 "%cPREPARED %cLOCKED %cDIRTY %cJDIRTY_WAIT",
3301 (unsigned long long)bh->b_blocknr,
3302 prepared ? ' ' : '!',
3303 buffer_locked(bh) ? ' ' : '!',
3304 buffer_dirty(bh) ? ' ' : '!',
3305 buffer_journal_dirty(bh) ? ' ' : '!');
3306 }
3307
3308 if (atomic_read(&journal->j_wcount) <= 0) {
3309 reiserfs_warning(sb, "journal-1409",
3310 "returning because j_wcount was %d",
3311 atomic_read(&journal->j_wcount));
3312 return 1;
3313 }
3314 /*
3315 * this error means I've screwed up, and we've overflowed
3316 * the transaction. Nothing can be done here, except make the
3317 * FS readonly or panic.
3318 */
3319 if (journal->j_len >= journal->j_trans_max) {
3320 reiserfs_panic(th->t_super, "journal-1413",
3321 "j_len (%lu) is too big",
3322 journal->j_len);
3323 }
3324
3325 if (buffer_journal_dirty(bh)) {
3326 count_already_incd = 1;
3327 PROC_INFO_INC(sb, journal.mark_dirty_notjournal);
3328 clear_buffer_journal_dirty(bh);
3329 }
3330
3331 if (journal->j_len > journal->j_len_alloc) {
3332 journal->j_len_alloc = journal->j_len + JOURNAL_PER_BALANCE_CNT;
3333 }
3334
3335 set_buffer_journaled(bh);
3336
3337 /* now put this guy on the end */
3338 if (!cn) {
3339 cn = get_cnode(sb);
3340 if (!cn) {
3341 reiserfs_panic(sb, "journal-4", "get_cnode failed!");
3342 }
3343
3344 if (th->t_blocks_logged == th->t_blocks_allocated) {
3345 th->t_blocks_allocated += JOURNAL_PER_BALANCE_CNT;
3346 journal->j_len_alloc += JOURNAL_PER_BALANCE_CNT;
3347 }
3348 th->t_blocks_logged++;
3349 journal->j_len++;
3350
3351 cn->bh = bh;
3352 cn->blocknr = bh->b_blocknr;
3353 cn->sb = sb;
3354 cn->jlist = NULL;
3355 insert_journal_hash(journal->j_hash_table, cn);
3356 if (!count_already_incd) {
3357 get_bh(bh);
3358 }
3359 }
3360 cn->next = NULL;
3361 cn->prev = journal->j_last;
3362 cn->bh = bh;
3363 if (journal->j_last) {
3364 journal->j_last->next = cn;
3365 journal->j_last = cn;
3366 } else {
3367 journal->j_first = cn;
3368 journal->j_last = cn;
3369 }
3370 reiserfs_schedule_old_flush(sb);
3371 return 0;
3372}
3373
3374int journal_end(struct reiserfs_transaction_handle *th)
3375{
3376 struct super_block *sb = th->t_super;
3377 if (!current->journal_info && th->t_refcount > 1)
3378 reiserfs_warning(sb, "REISER-NESTING",
3379 "th NULL, refcount %d", th->t_refcount);
3380
3381 if (!th->t_trans_id) {
3382 WARN_ON(1);
3383 return -EIO;
3384 }
3385
3386 th->t_refcount--;
3387 if (th->t_refcount > 0) {
3388 struct reiserfs_transaction_handle *cur_th =
3389 current->journal_info;
3390
3391 /*
3392 * we aren't allowed to close a nested transaction on a
3393 * different filesystem from the one in the task struct
3394 */
3395 BUG_ON(cur_th->t_super != th->t_super);
3396
3397 if (th != cur_th) {
3398 memcpy(current->journal_info, th, sizeof(*th));
3399 th->t_trans_id = 0;
3400 }
3401 return 0;
3402 } else {
3403 return do_journal_end(th, 0);
3404 }
3405}
3406
3407/*
3408 * removes from the current transaction, relsing and descrementing any counters.
3409 * also files the removed buffer directly onto the clean list
3410 *
3411 * called by journal_mark_freed when a block has been deleted
3412 *
3413 * returns 1 if it cleaned and relsed the buffer. 0 otherwise
3414 */
3415static int remove_from_transaction(struct super_block *sb,
3416 b_blocknr_t blocknr, int already_cleaned)
3417{
3418 struct buffer_head *bh;
3419 struct reiserfs_journal_cnode *cn;
3420 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3421 int ret = 0;
3422
3423 cn = get_journal_hash_dev(sb, journal->j_hash_table, blocknr);
3424 if (!cn || !cn->bh) {
3425 return ret;
3426 }
3427 bh = cn->bh;
3428 if (cn->prev) {
3429 cn->prev->next = cn->next;
3430 }
3431 if (cn->next) {
3432 cn->next->prev = cn->prev;
3433 }
3434 if (cn == journal->j_first) {
3435 journal->j_first = cn->next;
3436 }
3437 if (cn == journal->j_last) {
3438 journal->j_last = cn->prev;
3439 }
3440 remove_journal_hash(sb, journal->j_hash_table, NULL,
3441 bh->b_blocknr, 0);
3442 clear_buffer_journaled(bh); /* don't log this one */
3443
3444 if (!already_cleaned) {
3445 clear_buffer_journal_dirty(bh);
3446 clear_buffer_dirty(bh);
3447 clear_buffer_journal_test(bh);
3448 put_bh(bh);
3449 if (atomic_read(&bh->b_count) < 0) {
3450 reiserfs_warning(sb, "journal-1752",
3451 "b_count < 0");
3452 }
3453 ret = 1;
3454 }
3455 journal->j_len--;
3456 journal->j_len_alloc--;
3457 free_cnode(sb, cn);
3458 return ret;
3459}
3460
3461/*
3462 * for any cnode in a journal list, it can only be dirtied of all the
3463 * transactions that include it are committed to disk.
3464 * this checks through each transaction, and returns 1 if you are allowed
3465 * to dirty, and 0 if you aren't
3466 *
3467 * it is called by dirty_journal_list, which is called after
3468 * flush_commit_list has gotten all the log blocks for a given
3469 * transaction on disk
3470 *
3471 */
3472static int can_dirty(struct reiserfs_journal_cnode *cn)
3473{
3474 struct super_block *sb = cn->sb;
3475 b_blocknr_t blocknr = cn->blocknr;
3476 struct reiserfs_journal_cnode *cur = cn->hprev;
3477 int can_dirty = 1;
3478
3479 /*
3480 * first test hprev. These are all newer than cn, so any node here
3481 * with the same block number and dev means this node can't be sent
3482 * to disk right now.
3483 */
3484 while (cur && can_dirty) {
3485 if (cur->jlist && cur->bh && cur->blocknr && cur->sb == sb &&
3486 cur->blocknr == blocknr) {
3487 can_dirty = 0;
3488 }
3489 cur = cur->hprev;
3490 }
3491 /*
3492 * then test hnext. These are all older than cn. As long as they
3493 * are committed to the log, it is safe to write cn to disk
3494 */
3495 cur = cn->hnext;
3496 while (cur && can_dirty) {
3497 if (cur->jlist && cur->jlist->j_len > 0 &&
3498 atomic_read(&cur->jlist->j_commit_left) > 0 && cur->bh &&
3499 cur->blocknr && cur->sb == sb && cur->blocknr == blocknr) {
3500 can_dirty = 0;
3501 }
3502 cur = cur->hnext;
3503 }
3504 return can_dirty;
3505}
3506
3507/*
3508 * syncs the commit blocks, but does not force the real buffers to disk
3509 * will wait until the current transaction is done/committed before returning
3510 */
3511int journal_end_sync(struct reiserfs_transaction_handle *th)
3512{
3513 struct super_block *sb = th->t_super;
3514 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3515
3516 BUG_ON(!th->t_trans_id);
3517 /* you can sync while nested, very, very bad */
3518 BUG_ON(th->t_refcount > 1);
3519 if (journal->j_len == 0) {
3520 reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
3521 1);
3522 journal_mark_dirty(th, SB_BUFFER_WITH_SB(sb));
3523 }
3524 return do_journal_end(th, COMMIT_NOW | WAIT);
3525}
3526
3527/* writeback the pending async commits to disk */
3528static void flush_async_commits(struct work_struct *work)
3529{
3530 struct reiserfs_journal *journal =
3531 container_of(work, struct reiserfs_journal, j_work.work);
3532 struct super_block *sb = journal->j_work_sb;
3533 struct reiserfs_journal_list *jl;
3534 struct list_head *entry;
3535
3536 reiserfs_write_lock(sb);
3537 if (!list_empty(&journal->j_journal_list)) {
3538 /* last entry is the youngest, commit it and you get everything */
3539 entry = journal->j_journal_list.prev;
3540 jl = JOURNAL_LIST_ENTRY(entry);
3541 flush_commit_list(sb, jl, 1);
3542 }
3543 reiserfs_write_unlock(sb);
3544}
3545
3546/*
3547 * flushes any old transactions to disk
3548 * ends the current transaction if it is too old
3549 */
3550void reiserfs_flush_old_commits(struct super_block *sb)
3551{
3552 time64_t now;
3553 struct reiserfs_transaction_handle th;
3554 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3555
3556 now = ktime_get_seconds();
3557 /*
3558 * safety check so we don't flush while we are replaying the log during
3559 * mount
3560 */
3561 if (list_empty(&journal->j_journal_list))
3562 return;
3563
3564 /*
3565 * check the current transaction. If there are no writers, and it is
3566 * too old, finish it, and force the commit blocks to disk
3567 */
3568 if (atomic_read(&journal->j_wcount) <= 0 &&
3569 journal->j_trans_start_time > 0 &&
3570 journal->j_len > 0 &&
3571 (now - journal->j_trans_start_time) > journal->j_max_trans_age) {
3572 if (!journal_join(&th, sb)) {
3573 reiserfs_prepare_for_journal(sb,
3574 SB_BUFFER_WITH_SB(sb),
3575 1);
3576 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(sb));
3577
3578 /*
3579 * we're only being called from kreiserfsd, it makes
3580 * no sense to do an async commit so that kreiserfsd
3581 * can do it later
3582 */
3583 do_journal_end(&th, COMMIT_NOW | WAIT);
3584 }
3585 }
3586}
3587
3588/*
3589 * returns 0 if do_journal_end should return right away, returns 1 if
3590 * do_journal_end should finish the commit
3591 *
3592 * if the current transaction is too old, but still has writers, this will
3593 * wait on j_join_wait until all the writers are done. By the time it
3594 * wakes up, the transaction it was called has already ended, so it just
3595 * flushes the commit list and returns 0.
3596 *
3597 * Won't batch when flush or commit_now is set. Also won't batch when
3598 * others are waiting on j_join_wait.
3599 *
3600 * Note, we can't allow the journal_end to proceed while there are still
3601 * writers in the log.
3602 */
3603static int check_journal_end(struct reiserfs_transaction_handle *th, int flags)
3604{
3605
3606 time64_t now;
3607 int flush = flags & FLUSH_ALL;
3608 int commit_now = flags & COMMIT_NOW;
3609 int wait_on_commit = flags & WAIT;
3610 struct reiserfs_journal_list *jl;
3611 struct super_block *sb = th->t_super;
3612 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3613
3614 BUG_ON(!th->t_trans_id);
3615
3616 if (th->t_trans_id != journal->j_trans_id) {
3617 reiserfs_panic(th->t_super, "journal-1577",
3618 "handle trans id %ld != current trans id %ld",
3619 th->t_trans_id, journal->j_trans_id);
3620 }
3621
3622 journal->j_len_alloc -= (th->t_blocks_allocated - th->t_blocks_logged);
3623 /* <= 0 is allowed. unmounting might not call begin */
3624 if (atomic_read(&journal->j_wcount) > 0)
3625 atomic_dec(&journal->j_wcount);
3626
3627 /*
3628 * BUG, deal with case where j_len is 0, but people previously
3629 * freed blocks need to be released will be dealt with by next
3630 * transaction that actually writes something, but should be taken
3631 * care of in this trans
3632 */
3633 BUG_ON(journal->j_len == 0);
3634
3635 /*
3636 * if wcount > 0, and we are called to with flush or commit_now,
3637 * we wait on j_join_wait. We will wake up when the last writer has
3638 * finished the transaction, and started it on its way to the disk.
3639 * Then, we flush the commit or journal list, and just return 0
3640 * because the rest of journal end was already done for this
3641 * transaction.
3642 */
3643 if (atomic_read(&journal->j_wcount) > 0) {
3644 if (flush || commit_now) {
3645 unsigned trans_id;
3646
3647 jl = journal->j_current_jl;
3648 trans_id = jl->j_trans_id;
3649 if (wait_on_commit)
3650 jl->j_state |= LIST_COMMIT_PENDING;
3651 atomic_set(&journal->j_jlock, 1);
3652 if (flush) {
3653 journal->j_next_full_flush = 1;
3654 }
3655 unlock_journal(sb);
3656
3657 /*
3658 * sleep while the current transaction is
3659 * still j_jlocked
3660 */
3661 while (journal->j_trans_id == trans_id) {
3662 if (atomic_read(&journal->j_jlock)) {
3663 queue_log_writer(sb);
3664 } else {
3665 lock_journal(sb);
3666 if (journal->j_trans_id == trans_id) {
3667 atomic_set(&journal->j_jlock,
3668 1);
3669 }
3670 unlock_journal(sb);
3671 }
3672 }
3673 BUG_ON(journal->j_trans_id == trans_id);
3674
3675 if (commit_now
3676 && journal_list_still_alive(sb, trans_id)
3677 && wait_on_commit) {
3678 flush_commit_list(sb, jl, 1);
3679 }
3680 return 0;
3681 }
3682 unlock_journal(sb);
3683 return 0;
3684 }
3685
3686 /* deal with old transactions where we are the last writers */
3687 now = ktime_get_seconds();
3688 if ((now - journal->j_trans_start_time) > journal->j_max_trans_age) {
3689 commit_now = 1;
3690 journal->j_next_async_flush = 1;
3691 }
3692 /* don't batch when someone is waiting on j_join_wait */
3693 /* don't batch when syncing the commit or flushing the whole trans */
3694 if (!(journal->j_must_wait > 0) && !(atomic_read(&journal->j_jlock))
3695 && !flush && !commit_now && (journal->j_len < journal->j_max_batch)
3696 && journal->j_len_alloc < journal->j_max_batch
3697 && journal->j_cnode_free > (journal->j_trans_max * 3)) {
3698 journal->j_bcount++;
3699 unlock_journal(sb);
3700 return 0;
3701 }
3702
3703 if (journal->j_start > SB_ONDISK_JOURNAL_SIZE(sb)) {
3704 reiserfs_panic(sb, "journal-003",
3705 "j_start (%ld) is too high",
3706 journal->j_start);
3707 }
3708 return 1;
3709}
3710
3711/*
3712 * Does all the work that makes deleting blocks safe.
3713 * when deleting a block mark BH_JNew, just remove it from the current
3714 * transaction, clean it's buffer_head and move on.
3715 *
3716 * otherwise:
3717 * set a bit for the block in the journal bitmap. That will prevent it from
3718 * being allocated for unformatted nodes before this transaction has finished.
3719 *
3720 * mark any cnodes for this block as BLOCK_FREED, and clear their bh pointers.
3721 * That will prevent any old transactions with this block from trying to flush
3722 * to the real location. Since we aren't removing the cnode from the
3723 * journal_list_hash, *the block can't be reallocated yet.
3724 *
3725 * Then remove it from the current transaction, decrementing any counters and
3726 * filing it on the clean list.
3727 */
3728int journal_mark_freed(struct reiserfs_transaction_handle *th,
3729 struct super_block *sb, b_blocknr_t blocknr)
3730{
3731 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3732 struct reiserfs_journal_cnode *cn = NULL;
3733 struct buffer_head *bh = NULL;
3734 struct reiserfs_list_bitmap *jb = NULL;
3735 int cleaned = 0;
3736 BUG_ON(!th->t_trans_id);
3737
3738 cn = get_journal_hash_dev(sb, journal->j_hash_table, blocknr);
3739 if (cn && cn->bh) {
3740 bh = cn->bh;
3741 get_bh(bh);
3742 }
3743 /* if it is journal new, we just remove it from this transaction */
3744 if (bh && buffer_journal_new(bh)) {
3745 clear_buffer_journal_new(bh);
3746 clear_prepared_bits(bh);
3747 reiserfs_clean_and_file_buffer(bh);
3748 cleaned = remove_from_transaction(sb, blocknr, cleaned);
3749 } else {
3750 /*
3751 * set the bit for this block in the journal bitmap
3752 * for this transaction
3753 */
3754 jb = journal->j_current_jl->j_list_bitmap;
3755 if (!jb) {
3756 reiserfs_panic(sb, "journal-1702",
3757 "journal_list_bitmap is NULL");
3758 }
3759 set_bit_in_list_bitmap(sb, blocknr, jb);
3760
3761 /* Note, the entire while loop is not allowed to schedule. */
3762
3763 if (bh) {
3764 clear_prepared_bits(bh);
3765 reiserfs_clean_and_file_buffer(bh);
3766 }
3767 cleaned = remove_from_transaction(sb, blocknr, cleaned);
3768
3769 /*
3770 * find all older transactions with this block,
3771 * make sure they don't try to write it out
3772 */
3773 cn = get_journal_hash_dev(sb, journal->j_list_hash_table,
3774 blocknr);
3775 while (cn) {
3776 if (sb == cn->sb && blocknr == cn->blocknr) {
3777 set_bit(BLOCK_FREED, &cn->state);
3778 if (cn->bh) {
3779 /*
3780 * remove_from_transaction will brelse
3781 * the buffer if it was in the current
3782 * trans
3783 */
3784 if (!cleaned) {
3785 clear_buffer_journal_dirty(cn->
3786 bh);
3787 clear_buffer_dirty(cn->bh);
3788 clear_buffer_journal_test(cn->
3789 bh);
3790 cleaned = 1;
3791 put_bh(cn->bh);
3792 if (atomic_read
3793 (&cn->bh->b_count) < 0) {
3794 reiserfs_warning(sb,
3795 "journal-2138",
3796 "cn->bh->b_count < 0");
3797 }
3798 }
3799 /*
3800 * since we are clearing the bh,
3801 * we MUST dec nonzerolen
3802 */
3803 if (cn->jlist) {
3804 atomic_dec(&cn->jlist->
3805 j_nonzerolen);
3806 }
3807 cn->bh = NULL;
3808 }
3809 }
3810 cn = cn->hnext;
3811 }
3812 }
3813
3814 if (bh)
3815 release_buffer_page(bh); /* get_hash grabs the buffer */
3816 return 0;
3817}
3818
3819void reiserfs_update_inode_transaction(struct inode *inode)
3820{
3821 struct reiserfs_journal *journal = SB_JOURNAL(inode->i_sb);
3822 REISERFS_I(inode)->i_jl = journal->j_current_jl;
3823 REISERFS_I(inode)->i_trans_id = journal->j_trans_id;
3824}
3825
3826/*
3827 * returns -1 on error, 0 if no commits/barriers were done and 1
3828 * if a transaction was actually committed and the barrier was done
3829 */
3830static int __commit_trans_jl(struct inode *inode, unsigned long id,
3831 struct reiserfs_journal_list *jl)
3832{
3833 struct reiserfs_transaction_handle th;
3834 struct super_block *sb = inode->i_sb;
3835 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3836 int ret = 0;
3837
3838 /*
3839 * is it from the current transaction,
3840 * or from an unknown transaction?
3841 */
3842 if (id == journal->j_trans_id) {
3843 jl = journal->j_current_jl;
3844 /*
3845 * try to let other writers come in and
3846 * grow this transaction
3847 */
3848 let_transaction_grow(sb, id);
3849 if (journal->j_trans_id != id) {
3850 goto flush_commit_only;
3851 }
3852
3853 ret = journal_begin(&th, sb, 1);
3854 if (ret)
3855 return ret;
3856
3857 /* someone might have ended this transaction while we joined */
3858 if (journal->j_trans_id != id) {
3859 reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
3860 1);
3861 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(sb));
3862 ret = journal_end(&th);
3863 goto flush_commit_only;
3864 }
3865
3866 ret = journal_end_sync(&th);
3867 if (!ret)
3868 ret = 1;
3869
3870 } else {
3871 /*
3872 * this gets tricky, we have to make sure the journal list in
3873 * the inode still exists. We know the list is still around
3874 * if we've got a larger transaction id than the oldest list
3875 */
3876flush_commit_only:
3877 if (journal_list_still_alive(inode->i_sb, id)) {
3878 /*
3879 * we only set ret to 1 when we know for sure
3880 * the barrier hasn't been started yet on the commit
3881 * block.
3882 */
3883 if (atomic_read(&jl->j_commit_left) > 1)
3884 ret = 1;
3885 flush_commit_list(sb, jl, 1);
3886 if (journal->j_errno)
3887 ret = journal->j_errno;
3888 }
3889 }
3890 /* otherwise the list is gone, and long since committed */
3891 return ret;
3892}
3893
3894int reiserfs_commit_for_inode(struct inode *inode)
3895{
3896 unsigned int id = REISERFS_I(inode)->i_trans_id;
3897 struct reiserfs_journal_list *jl = REISERFS_I(inode)->i_jl;
3898
3899 /*
3900 * for the whole inode, assume unset id means it was
3901 * changed in the current transaction. More conservative
3902 */
3903 if (!id || !jl) {
3904 reiserfs_update_inode_transaction(inode);
3905 id = REISERFS_I(inode)->i_trans_id;
3906 /* jl will be updated in __commit_trans_jl */
3907 }
3908
3909 return __commit_trans_jl(inode, id, jl);
3910}
3911
3912void reiserfs_restore_prepared_buffer(struct super_block *sb,
3913 struct buffer_head *bh)
3914{
3915 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3916 PROC_INFO_INC(sb, journal.restore_prepared);
3917 if (!bh) {
3918 return;
3919 }
3920 if (test_clear_buffer_journal_restore_dirty(bh) &&
3921 buffer_journal_dirty(bh)) {
3922 struct reiserfs_journal_cnode *cn;
3923 reiserfs_write_lock(sb);
3924 cn = get_journal_hash_dev(sb,
3925 journal->j_list_hash_table,
3926 bh->b_blocknr);
3927 if (cn && can_dirty(cn)) {
3928 set_buffer_journal_test(bh);
3929 mark_buffer_dirty(bh);
3930 }
3931 reiserfs_write_unlock(sb);
3932 }
3933 clear_buffer_journal_prepared(bh);
3934}
3935
3936extern struct tree_balance *cur_tb;
3937/*
3938 * before we can change a metadata block, we have to make sure it won't
3939 * be written to disk while we are altering it. So, we must:
3940 * clean it
3941 * wait on it.
3942 */
3943int reiserfs_prepare_for_journal(struct super_block *sb,
3944 struct buffer_head *bh, int wait)
3945{
3946 PROC_INFO_INC(sb, journal.prepare);
3947
3948 if (!trylock_buffer(bh)) {
3949 if (!wait)
3950 return 0;
3951 lock_buffer(bh);
3952 }
3953 set_buffer_journal_prepared(bh);
3954 if (test_clear_buffer_dirty(bh) && buffer_journal_dirty(bh)) {
3955 clear_buffer_journal_test(bh);
3956 set_buffer_journal_restore_dirty(bh);
3957 }
3958 unlock_buffer(bh);
3959 return 1;
3960}
3961
3962/*
3963 * long and ugly. If flush, will not return until all commit
3964 * blocks and all real buffers in the trans are on disk.
3965 * If no_async, won't return until all commit blocks are on disk.
3966 *
3967 * keep reading, there are comments as you go along
3968 *
3969 * If the journal is aborted, we just clean up. Things like flushing
3970 * journal lists, etc just won't happen.
3971 */
3972static int do_journal_end(struct reiserfs_transaction_handle *th, int flags)
3973{
3974 struct super_block *sb = th->t_super;
3975 struct reiserfs_journal *journal = SB_JOURNAL(sb);
3976 struct reiserfs_journal_cnode *cn, *next, *jl_cn;
3977 struct reiserfs_journal_cnode *last_cn = NULL;
3978 struct reiserfs_journal_desc *desc;
3979 struct reiserfs_journal_commit *commit;
3980 struct buffer_head *c_bh; /* commit bh */
3981 struct buffer_head *d_bh; /* desc bh */
3982 int cur_write_start = 0; /* start index of current log write */
3983 int i;
3984 int flush;
3985 int wait_on_commit;
3986 struct reiserfs_journal_list *jl, *temp_jl;
3987 struct list_head *entry, *safe;
3988 unsigned long jindex;
3989 unsigned int commit_trans_id;
3990 int trans_half;
3991 int depth;
3992
3993 BUG_ON(th->t_refcount > 1);
3994 BUG_ON(!th->t_trans_id);
3995 BUG_ON(!th->t_super);
3996
3997 /*
3998 * protect flush_older_commits from doing mistakes if the
3999 * transaction ID counter gets overflowed.
4000 */
4001 if (th->t_trans_id == ~0U)
4002 flags |= FLUSH_ALL | COMMIT_NOW | WAIT;
4003 flush = flags & FLUSH_ALL;
4004 wait_on_commit = flags & WAIT;
4005
4006 current->journal_info = th->t_handle_save;
4007 reiserfs_check_lock_depth(sb, "journal end");
4008 if (journal->j_len == 0) {
4009 reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
4010 1);
4011 journal_mark_dirty(th, SB_BUFFER_WITH_SB(sb));
4012 }
4013
4014 lock_journal(sb);
4015 if (journal->j_next_full_flush) {
4016 flags |= FLUSH_ALL;
4017 flush = 1;
4018 }
4019 if (journal->j_next_async_flush) {
4020 flags |= COMMIT_NOW | WAIT;
4021 wait_on_commit = 1;
4022 }
4023
4024 /*
4025 * check_journal_end locks the journal, and unlocks if it does
4026 * not return 1 it tells us if we should continue with the
4027 * journal_end, or just return
4028 */
4029 if (!check_journal_end(th, flags)) {
4030 reiserfs_schedule_old_flush(sb);
4031 wake_queued_writers(sb);
4032 reiserfs_async_progress_wait(sb);
4033 goto out;
4034 }
4035
4036 /* check_journal_end might set these, check again */
4037 if (journal->j_next_full_flush) {
4038 flush = 1;
4039 }
4040
4041 /*
4042 * j must wait means we have to flush the log blocks, and the
4043 * real blocks for this transaction
4044 */
4045 if (journal->j_must_wait > 0) {
4046 flush = 1;
4047 }
4048#ifdef REISERFS_PREALLOCATE
4049 /*
4050 * quota ops might need to nest, setup the journal_info pointer
4051 * for them and raise the refcount so that it is > 0.
4052 */
4053 current->journal_info = th;
4054 th->t_refcount++;
4055
4056 /* it should not involve new blocks into the transaction */
4057 reiserfs_discard_all_prealloc(th);
4058
4059 th->t_refcount--;
4060 current->journal_info = th->t_handle_save;
4061#endif
4062
4063 /* setup description block */
4064 d_bh =
4065 journal_getblk(sb,
4066 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
4067 journal->j_start);
4068 set_buffer_uptodate(d_bh);
4069 desc = (struct reiserfs_journal_desc *)(d_bh)->b_data;
4070 memset(d_bh->b_data, 0, d_bh->b_size);
4071 memcpy(get_journal_desc_magic(d_bh), JOURNAL_DESC_MAGIC, 8);
4072 set_desc_trans_id(desc, journal->j_trans_id);
4073
4074 /*
4075 * setup commit block. Don't write (keep it clean too) this one
4076 * until after everyone else is written
4077 */
4078 c_bh = journal_getblk(sb, SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
4079 ((journal->j_start + journal->j_len +
4080 1) % SB_ONDISK_JOURNAL_SIZE(sb)));
4081 commit = (struct reiserfs_journal_commit *)c_bh->b_data;
4082 memset(c_bh->b_data, 0, c_bh->b_size);
4083 set_commit_trans_id(commit, journal->j_trans_id);
4084 set_buffer_uptodate(c_bh);
4085
4086 /* init this journal list */
4087 jl = journal->j_current_jl;
4088
4089 /*
4090 * we lock the commit before doing anything because
4091 * we want to make sure nobody tries to run flush_commit_list until
4092 * the new transaction is fully setup, and we've already flushed the
4093 * ordered bh list
4094 */
4095 reiserfs_mutex_lock_safe(&jl->j_commit_mutex, sb);
4096
4097 /* save the transaction id in case we need to commit it later */
4098 commit_trans_id = jl->j_trans_id;
4099
4100 atomic_set(&jl->j_older_commits_done, 0);
4101 jl->j_trans_id = journal->j_trans_id;
4102 jl->j_timestamp = journal->j_trans_start_time;
4103 jl->j_commit_bh = c_bh;
4104 jl->j_start = journal->j_start;
4105 jl->j_len = journal->j_len;
4106 atomic_set(&jl->j_nonzerolen, journal->j_len);
4107 atomic_set(&jl->j_commit_left, journal->j_len + 2);
4108 jl->j_realblock = NULL;
4109
4110 /*
4111 * The ENTIRE FOR LOOP MUST not cause schedule to occur.
4112 * for each real block, add it to the journal list hash,
4113 * copy into real block index array in the commit or desc block
4114 */
4115 trans_half = journal_trans_half(sb->s_blocksize);
4116 for (i = 0, cn = journal->j_first; cn; cn = cn->next, i++) {
4117 if (buffer_journaled(cn->bh)) {
4118 jl_cn = get_cnode(sb);
4119 if (!jl_cn) {
4120 reiserfs_panic(sb, "journal-1676",
4121 "get_cnode returned NULL");
4122 }
4123 if (i == 0) {
4124 jl->j_realblock = jl_cn;
4125 }
4126 jl_cn->prev = last_cn;
4127 jl_cn->next = NULL;
4128 if (last_cn) {
4129 last_cn->next = jl_cn;
4130 }
4131 last_cn = jl_cn;
4132 /*
4133 * make sure the block we are trying to log
4134 * is not a block of journal or reserved area
4135 */
4136 if (is_block_in_log_or_reserved_area
4137 (sb, cn->bh->b_blocknr)) {
4138 reiserfs_panic(sb, "journal-2332",
4139 "Trying to log block %lu, "
4140 "which is a log block",
4141 cn->bh->b_blocknr);
4142 }
4143 jl_cn->blocknr = cn->bh->b_blocknr;
4144 jl_cn->state = 0;
4145 jl_cn->sb = sb;
4146 jl_cn->bh = cn->bh;
4147 jl_cn->jlist = jl;
4148 insert_journal_hash(journal->j_list_hash_table, jl_cn);
4149 if (i < trans_half) {
4150 desc->j_realblock[i] =
4151 cpu_to_le32(cn->bh->b_blocknr);
4152 } else {
4153 commit->j_realblock[i - trans_half] =
4154 cpu_to_le32(cn->bh->b_blocknr);
4155 }
4156 } else {
4157 i--;
4158 }
4159 }
4160 set_desc_trans_len(desc, journal->j_len);
4161 set_desc_mount_id(desc, journal->j_mount_id);
4162 set_desc_trans_id(desc, journal->j_trans_id);
4163 set_commit_trans_len(commit, journal->j_len);
4164
4165 /*
4166 * special check in case all buffers in the journal
4167 * were marked for not logging
4168 */
4169 BUG_ON(journal->j_len == 0);
4170
4171 /*
4172 * we're about to dirty all the log blocks, mark the description block
4173 * dirty now too. Don't mark the commit block dirty until all the
4174 * others are on disk
4175 */
4176 mark_buffer_dirty(d_bh);
4177
4178 /*
4179 * first data block is j_start + 1, so add one to
4180 * cur_write_start wherever you use it
4181 */
4182 cur_write_start = journal->j_start;
4183 cn = journal->j_first;
4184 jindex = 1; /* start at one so we don't get the desc again */
4185 while (cn) {
4186 clear_buffer_journal_new(cn->bh);
4187 /* copy all the real blocks into log area. dirty log blocks */
4188 if (buffer_journaled(cn->bh)) {
4189 struct buffer_head *tmp_bh;
4190 char *addr;
4191 struct page *page;
4192 tmp_bh =
4193 journal_getblk(sb,
4194 SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
4195 ((cur_write_start +
4196 jindex) %
4197 SB_ONDISK_JOURNAL_SIZE(sb)));
4198 set_buffer_uptodate(tmp_bh);
4199 page = cn->bh->b_page;
4200 addr = kmap(page);
4201 memcpy(tmp_bh->b_data,
4202 addr + offset_in_page(cn->bh->b_data),
4203 cn->bh->b_size);
4204 kunmap(page);
4205 mark_buffer_dirty(tmp_bh);
4206 jindex++;
4207 set_buffer_journal_dirty(cn->bh);
4208 clear_buffer_journaled(cn->bh);
4209 } else {
4210 /*
4211 * JDirty cleared sometime during transaction.
4212 * don't log this one
4213 */
4214 reiserfs_warning(sb, "journal-2048",
4215 "BAD, buffer in journal hash, "
4216 "but not JDirty!");
4217 brelse(cn->bh);
4218 }
4219 next = cn->next;
4220 free_cnode(sb, cn);
4221 cn = next;
4222 reiserfs_cond_resched(sb);
4223 }
4224
4225 /*
4226 * we are done with both the c_bh and d_bh, but
4227 * c_bh must be written after all other commit blocks,
4228 * so we dirty/relse c_bh in flush_commit_list, with commit_left <= 1.
4229 */
4230
4231 journal->j_current_jl = alloc_journal_list(sb);
4232
4233 /* now it is safe to insert this transaction on the main list */
4234 list_add_tail(&jl->j_list, &journal->j_journal_list);
4235 list_add_tail(&jl->j_working_list, &journal->j_working_list);
4236 journal->j_num_work_lists++;
4237
4238 /* reset journal values for the next transaction */
4239 journal->j_start =
4240 (journal->j_start + journal->j_len +
4241 2) % SB_ONDISK_JOURNAL_SIZE(sb);
4242 atomic_set(&journal->j_wcount, 0);
4243 journal->j_bcount = 0;
4244 journal->j_last = NULL;
4245 journal->j_first = NULL;
4246 journal->j_len = 0;
4247 journal->j_trans_start_time = 0;
4248 /* check for trans_id overflow */
4249 if (++journal->j_trans_id == 0)
4250 journal->j_trans_id = 10;
4251 journal->j_current_jl->j_trans_id = journal->j_trans_id;
4252 journal->j_must_wait = 0;
4253 journal->j_len_alloc = 0;
4254 journal->j_next_full_flush = 0;
4255 journal->j_next_async_flush = 0;
4256 init_journal_hash(sb);
4257
4258 /*
4259 * make sure reiserfs_add_jh sees the new current_jl before we
4260 * write out the tails
4261 */
4262 smp_mb();
4263
4264 /*
4265 * tail conversion targets have to hit the disk before we end the
4266 * transaction. Otherwise a later transaction might repack the tail
4267 * before this transaction commits, leaving the data block unflushed
4268 * and clean, if we crash before the later transaction commits, the
4269 * data block is lost.
4270 */
4271 if (!list_empty(&jl->j_tail_bh_list)) {
4272 depth = reiserfs_write_unlock_nested(sb);
4273 write_ordered_buffers(&journal->j_dirty_buffers_lock,
4274 journal, jl, &jl->j_tail_bh_list);
4275 reiserfs_write_lock_nested(sb, depth);
4276 }
4277 BUG_ON(!list_empty(&jl->j_tail_bh_list));
4278 mutex_unlock(&jl->j_commit_mutex);
4279
4280 /*
4281 * honor the flush wishes from the caller, simple commits can
4282 * be done outside the journal lock, they are done below
4283 *
4284 * if we don't flush the commit list right now, we put it into
4285 * the work queue so the people waiting on the async progress work
4286 * queue don't wait for this proc to flush journal lists and such.
4287 */
4288 if (flush) {
4289 flush_commit_list(sb, jl, 1);
4290 flush_journal_list(sb, jl, 1);
4291 } else if (!(jl->j_state & LIST_COMMIT_PENDING)) {
4292 /*
4293 * Avoid queueing work when sb is being shut down. Transaction
4294 * will be flushed on journal shutdown.
4295 */
4296 if (sb->s_flags & SB_ACTIVE)
4297 queue_delayed_work(REISERFS_SB(sb)->commit_wq,
4298 &journal->j_work, HZ / 10);
4299 }
4300
4301 /*
4302 * if the next transaction has any chance of wrapping, flush
4303 * transactions that might get overwritten. If any journal lists
4304 * are very old flush them as well.
4305 */
4306first_jl:
4307 list_for_each_safe(entry, safe, &journal->j_journal_list) {
4308 temp_jl = JOURNAL_LIST_ENTRY(entry);
4309 if (journal->j_start <= temp_jl->j_start) {
4310 if ((journal->j_start + journal->j_trans_max + 1) >=
4311 temp_jl->j_start) {
4312 flush_used_journal_lists(sb, temp_jl);
4313 goto first_jl;
4314 } else if ((journal->j_start +
4315 journal->j_trans_max + 1) <
4316 SB_ONDISK_JOURNAL_SIZE(sb)) {
4317 /*
4318 * if we don't cross into the next
4319 * transaction and we don't wrap, there is
4320 * no way we can overlap any later transactions
4321 * break now
4322 */
4323 break;
4324 }
4325 } else if ((journal->j_start +
4326 journal->j_trans_max + 1) >
4327 SB_ONDISK_JOURNAL_SIZE(sb)) {
4328 if (((journal->j_start + journal->j_trans_max + 1) %
4329 SB_ONDISK_JOURNAL_SIZE(sb)) >=
4330 temp_jl->j_start) {
4331 flush_used_journal_lists(sb, temp_jl);
4332 goto first_jl;
4333 } else {
4334 /*
4335 * we don't overlap anything from out start
4336 * to the end of the log, and our wrapped
4337 * portion doesn't overlap anything at
4338 * the start of the log. We can break
4339 */
4340 break;
4341 }
4342 }
4343 }
4344
4345 journal->j_current_jl->j_list_bitmap =
4346 get_list_bitmap(sb, journal->j_current_jl);
4347
4348 if (!(journal->j_current_jl->j_list_bitmap)) {
4349 reiserfs_panic(sb, "journal-1996",
4350 "could not get a list bitmap");
4351 }
4352
4353 atomic_set(&journal->j_jlock, 0);
4354 unlock_journal(sb);
4355 /* wake up any body waiting to join. */
4356 clear_bit(J_WRITERS_QUEUED, &journal->j_state);
4357 wake_up(&journal->j_join_wait);
4358
4359 if (!flush && wait_on_commit &&
4360 journal_list_still_alive(sb, commit_trans_id)) {
4361 flush_commit_list(sb, jl, 1);
4362 }
4363out:
4364 reiserfs_check_lock_depth(sb, "journal end2");
4365
4366 memset(th, 0, sizeof(*th));
4367 /*
4368 * Re-set th->t_super, so we can properly keep track of how many
4369 * persistent transactions there are. We need to do this so if this
4370 * call is part of a failed restart_transaction, we can free it later
4371 */
4372 th->t_super = sb;
4373
4374 return journal->j_errno;
4375}
4376
4377/* Send the file system read only and refuse new transactions */
4378void reiserfs_abort_journal(struct super_block *sb, int errno)
4379{
4380 struct reiserfs_journal *journal = SB_JOURNAL(sb);
4381 if (test_bit(J_ABORTED, &journal->j_state))
4382 return;
4383
4384 if (!journal->j_errno)
4385 journal->j_errno = errno;
4386
4387 sb->s_flags |= SB_RDONLY;
4388 set_bit(J_ABORTED, &journal->j_state);
4389
4390#ifdef CONFIG_REISERFS_CHECK
4391 dump_stack();
4392#endif
4393}