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20#include <linux/time.h>
21#include <linux/fs.h>
22#include <linux/jbd2.h>
23#include <linux/marker.h>
24#include <linux/errno.h>
25#include <linux/slab.h>
26
27
28
29
30
31
32static inline void __buffer_unlink_first(struct journal_head *jh)
33{
34 transaction_t *transaction = jh->b_cp_transaction;
35
36 jh->b_cpnext->b_cpprev = jh->b_cpprev;
37 jh->b_cpprev->b_cpnext = jh->b_cpnext;
38 if (transaction->t_checkpoint_list == jh) {
39 transaction->t_checkpoint_list = jh->b_cpnext;
40 if (transaction->t_checkpoint_list == jh)
41 transaction->t_checkpoint_list = NULL;
42 }
43}
44
45
46
47
48
49
50static inline void __buffer_unlink(struct journal_head *jh)
51{
52 transaction_t *transaction = jh->b_cp_transaction;
53
54 __buffer_unlink_first(jh);
55 if (transaction->t_checkpoint_io_list == jh) {
56 transaction->t_checkpoint_io_list = jh->b_cpnext;
57 if (transaction->t_checkpoint_io_list == jh)
58 transaction->t_checkpoint_io_list = NULL;
59 }
60}
61
62
63
64
65
66
67static inline void __buffer_relink_io(struct journal_head *jh)
68{
69 transaction_t *transaction = jh->b_cp_transaction;
70
71 __buffer_unlink_first(jh);
72
73 if (!transaction->t_checkpoint_io_list) {
74 jh->b_cpnext = jh->b_cpprev = jh;
75 } else {
76 jh->b_cpnext = transaction->t_checkpoint_io_list;
77 jh->b_cpprev = transaction->t_checkpoint_io_list->b_cpprev;
78 jh->b_cpprev->b_cpnext = jh;
79 jh->b_cpnext->b_cpprev = jh;
80 }
81 transaction->t_checkpoint_io_list = jh;
82}
83
84
85
86
87
88
89
90
91
92static int __try_to_free_cp_buf(struct journal_head *jh)
93{
94 int ret = 0;
95 struct buffer_head *bh = jh2bh(jh);
96
97 if (jh->b_jlist == BJ_None && !buffer_locked(bh) &&
98 !buffer_dirty(bh) && !buffer_write_io_error(bh)) {
99 JBUFFER_TRACE(jh, "remove from checkpoint list");
100 ret = __jbd2_journal_remove_checkpoint(jh) + 1;
101 jbd_unlock_bh_state(bh);
102 jbd2_journal_remove_journal_head(bh);
103 BUFFER_TRACE(bh, "release");
104 __brelse(bh);
105 } else {
106 jbd_unlock_bh_state(bh);
107 }
108 return ret;
109}
110
111
112
113
114
115
116
117void __jbd2_log_wait_for_space(journal_t *journal)
118{
119 int nblocks, space_left;
120 assert_spin_locked(&journal->j_state_lock);
121
122 nblocks = jbd_space_needed(journal);
123 while (__jbd2_log_space_left(journal) < nblocks) {
124 if (journal->j_flags & JBD2_ABORT)
125 return;
126 spin_unlock(&journal->j_state_lock);
127 mutex_lock(&journal->j_checkpoint_mutex);
128
129
130
131
132
133
134
135
136
137
138
139
140 spin_lock(&journal->j_state_lock);
141 spin_lock(&journal->j_list_lock);
142 nblocks = jbd_space_needed(journal);
143 space_left = __jbd2_log_space_left(journal);
144 if (space_left < nblocks) {
145 int chkpt = journal->j_checkpoint_transactions != NULL;
146 tid_t tid = 0;
147
148 if (journal->j_committing_transaction)
149 tid = journal->j_committing_transaction->t_tid;
150 spin_unlock(&journal->j_list_lock);
151 spin_unlock(&journal->j_state_lock);
152 if (chkpt) {
153 jbd2_log_do_checkpoint(journal);
154 } else if (jbd2_cleanup_journal_tail(journal) == 0) {
155
156 ;
157 } else if (tid) {
158 jbd2_log_wait_commit(journal, tid);
159 } else {
160 printk(KERN_ERR "%s: needed %d blocks and "
161 "only had %d space available\n",
162 __func__, nblocks, space_left);
163 printk(KERN_ERR "%s: no way to get more "
164 "journal space in %s\n", __func__,
165 journal->j_devname);
166 WARN_ON(1);
167 jbd2_journal_abort(journal, 0);
168 }
169 spin_lock(&journal->j_state_lock);
170 } else {
171 spin_unlock(&journal->j_list_lock);
172 }
173 mutex_unlock(&journal->j_checkpoint_mutex);
174 }
175}
176
177
178
179
180
181
182static void jbd_sync_bh(journal_t *journal, struct buffer_head *bh)
183 __releases(journal->j_list_lock)
184{
185 get_bh(bh);
186 spin_unlock(&journal->j_list_lock);
187 jbd_lock_bh_state(bh);
188 jbd_unlock_bh_state(bh);
189 put_bh(bh);
190}
191
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201
202
203static int __wait_cp_io(journal_t *journal, transaction_t *transaction)
204{
205 struct journal_head *jh;
206 struct buffer_head *bh;
207 tid_t this_tid;
208 int released = 0;
209 int ret = 0;
210
211 this_tid = transaction->t_tid;
212restart:
213
214 if (journal->j_checkpoint_transactions != transaction ||
215 transaction->t_tid != this_tid)
216 return ret;
217 while (!released && transaction->t_checkpoint_io_list) {
218 jh = transaction->t_checkpoint_io_list;
219 bh = jh2bh(jh);
220 if (!jbd_trylock_bh_state(bh)) {
221 jbd_sync_bh(journal, bh);
222 spin_lock(&journal->j_list_lock);
223 goto restart;
224 }
225 if (buffer_locked(bh)) {
226 atomic_inc(&bh->b_count);
227 spin_unlock(&journal->j_list_lock);
228 jbd_unlock_bh_state(bh);
229 wait_on_buffer(bh);
230
231 BUFFER_TRACE(bh, "brelse");
232 __brelse(bh);
233 spin_lock(&journal->j_list_lock);
234 goto restart;
235 }
236 if (unlikely(buffer_write_io_error(bh)))
237 ret = -EIO;
238
239
240
241
242
243 released = __jbd2_journal_remove_checkpoint(jh);
244 jbd_unlock_bh_state(bh);
245 jbd2_journal_remove_journal_head(bh);
246 __brelse(bh);
247 }
248
249 return ret;
250}
251
252#define NR_BATCH 64
253
254static void
255__flush_batch(journal_t *journal, struct buffer_head **bhs, int *batch_count)
256{
257 int i;
258
259 ll_rw_block(SWRITE, *batch_count, bhs);
260 for (i = 0; i < *batch_count; i++) {
261 struct buffer_head *bh = bhs[i];
262 clear_buffer_jwrite(bh);
263 BUFFER_TRACE(bh, "brelse");
264 __brelse(bh);
265 }
266 *batch_count = 0;
267}
268
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277
278
279static int __process_buffer(journal_t *journal, struct journal_head *jh,
280 struct buffer_head **bhs, int *batch_count,
281 transaction_t *transaction)
282{
283 struct buffer_head *bh = jh2bh(jh);
284 int ret = 0;
285
286 if (buffer_locked(bh)) {
287 atomic_inc(&bh->b_count);
288 spin_unlock(&journal->j_list_lock);
289 jbd_unlock_bh_state(bh);
290 wait_on_buffer(bh);
291
292 BUFFER_TRACE(bh, "brelse");
293 __brelse(bh);
294 ret = 1;
295 } else if (jh->b_transaction != NULL) {
296 transaction_t *t = jh->b_transaction;
297 tid_t tid = t->t_tid;
298
299 transaction->t_chp_stats.cs_forced_to_close++;
300 spin_unlock(&journal->j_list_lock);
301 jbd_unlock_bh_state(bh);
302 jbd2_log_start_commit(journal, tid);
303 jbd2_log_wait_commit(journal, tid);
304 ret = 1;
305 } else if (!buffer_dirty(bh)) {
306 ret = 1;
307 if (unlikely(buffer_write_io_error(bh)))
308 ret = -EIO;
309 J_ASSERT_JH(jh, !buffer_jbddirty(bh));
310 BUFFER_TRACE(bh, "remove from checkpoint");
311 __jbd2_journal_remove_checkpoint(jh);
312 spin_unlock(&journal->j_list_lock);
313 jbd_unlock_bh_state(bh);
314 jbd2_journal_remove_journal_head(bh);
315 __brelse(bh);
316 } else {
317
318
319
320
321
322
323
324 BUFFER_TRACE(bh, "queue");
325 get_bh(bh);
326 J_ASSERT_BH(bh, !buffer_jwrite(bh));
327 set_buffer_jwrite(bh);
328 bhs[*batch_count] = bh;
329 __buffer_relink_io(jh);
330 jbd_unlock_bh_state(bh);
331 transaction->t_chp_stats.cs_written++;
332 (*batch_count)++;
333 if (*batch_count == NR_BATCH) {
334 spin_unlock(&journal->j_list_lock);
335 __flush_batch(journal, bhs, batch_count);
336 ret = 1;
337 }
338 }
339 return ret;
340}
341
342
343
344
345
346
347
348
349
350int jbd2_log_do_checkpoint(journal_t *journal)
351{
352 transaction_t *transaction;
353 tid_t this_tid;
354 int result;
355
356 jbd_debug(1, "Start checkpoint\n");
357
358
359
360
361
362
363 result = jbd2_cleanup_journal_tail(journal);
364 trace_mark(jbd2_checkpoint, "dev %s need_checkpoint %d",
365 journal->j_devname, result);
366 jbd_debug(1, "cleanup_journal_tail returned %d\n", result);
367 if (result <= 0)
368 return result;
369
370
371
372
373
374 result = 0;
375 spin_lock(&journal->j_list_lock);
376 if (!journal->j_checkpoint_transactions)
377 goto out;
378 transaction = journal->j_checkpoint_transactions;
379 if (transaction->t_chp_stats.cs_chp_time == 0)
380 transaction->t_chp_stats.cs_chp_time = jiffies;
381 this_tid = transaction->t_tid;
382restart:
383
384
385
386
387
388 if (journal->j_checkpoint_transactions == transaction &&
389 transaction->t_tid == this_tid) {
390 int batch_count = 0;
391 struct buffer_head *bhs[NR_BATCH];
392 struct journal_head *jh;
393 int retry = 0, err;
394
395 while (!retry && transaction->t_checkpoint_list) {
396 struct buffer_head *bh;
397
398 jh = transaction->t_checkpoint_list;
399 bh = jh2bh(jh);
400 if (!jbd_trylock_bh_state(bh)) {
401 jbd_sync_bh(journal, bh);
402 retry = 1;
403 break;
404 }
405 retry = __process_buffer(journal, jh, bhs, &batch_count,
406 transaction);
407 if (retry < 0 && !result)
408 result = retry;
409 if (!retry && (need_resched() ||
410 spin_needbreak(&journal->j_list_lock))) {
411 spin_unlock(&journal->j_list_lock);
412 retry = 1;
413 break;
414 }
415 }
416
417 if (batch_count) {
418 if (!retry) {
419 spin_unlock(&journal->j_list_lock);
420 retry = 1;
421 }
422 __flush_batch(journal, bhs, &batch_count);
423 }
424
425 if (retry) {
426 spin_lock(&journal->j_list_lock);
427 goto restart;
428 }
429
430
431
432
433 err = __wait_cp_io(journal, transaction);
434 if (!result)
435 result = err;
436 }
437out:
438 spin_unlock(&journal->j_list_lock);
439 if (result < 0)
440 jbd2_journal_abort(journal, result);
441 else
442 result = jbd2_cleanup_journal_tail(journal);
443
444 return (result < 0) ? result : 0;
445}
446
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463
464
465int jbd2_cleanup_journal_tail(journal_t *journal)
466{
467 transaction_t * transaction;
468 tid_t first_tid;
469 unsigned long blocknr, freed;
470
471 if (is_journal_aborted(journal))
472 return 1;
473
474
475
476
477
478
479
480
481 spin_lock(&journal->j_state_lock);
482 spin_lock(&journal->j_list_lock);
483 transaction = journal->j_checkpoint_transactions;
484 if (transaction) {
485 first_tid = transaction->t_tid;
486 blocknr = transaction->t_log_start;
487 } else if ((transaction = journal->j_committing_transaction) != NULL) {
488 first_tid = transaction->t_tid;
489 blocknr = transaction->t_log_start;
490 } else if ((transaction = journal->j_running_transaction) != NULL) {
491 first_tid = transaction->t_tid;
492 blocknr = journal->j_head;
493 } else {
494 first_tid = journal->j_transaction_sequence;
495 blocknr = journal->j_head;
496 }
497 spin_unlock(&journal->j_list_lock);
498 J_ASSERT(blocknr != 0);
499
500
501
502 if (journal->j_tail_sequence == first_tid) {
503 spin_unlock(&journal->j_state_lock);
504 return 1;
505 }
506
507
508
509
510 freed = blocknr - journal->j_tail;
511 if (blocknr < journal->j_tail)
512 freed = freed + journal->j_last - journal->j_first;
513
514 jbd_debug(1,
515 "Cleaning journal tail from %d to %d (offset %lu), "
516 "freeing %lu\n",
517 journal->j_tail_sequence, first_tid, blocknr, freed);
518
519 journal->j_free += freed;
520 journal->j_tail_sequence = first_tid;
521 journal->j_tail = blocknr;
522 spin_unlock(&journal->j_state_lock);
523 if (!(journal->j_flags & JBD2_ABORT))
524 jbd2_journal_update_superblock(journal, 1);
525 return 0;
526}
527
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540
541static int journal_clean_one_cp_list(struct journal_head *jh, int *released)
542{
543 struct journal_head *last_jh;
544 struct journal_head *next_jh = jh;
545 int ret, freed = 0;
546
547 *released = 0;
548 if (!jh)
549 return 0;
550
551 last_jh = jh->b_cpprev;
552 do {
553 jh = next_jh;
554 next_jh = jh->b_cpnext;
555
556 if (jbd_trylock_bh_state(jh2bh(jh))) {
557 ret = __try_to_free_cp_buf(jh);
558 if (ret) {
559 freed++;
560 if (ret == 2) {
561 *released = 1;
562 return freed;
563 }
564 }
565 }
566
567
568
569
570
571
572 if (need_resched())
573 return freed;
574 } while (jh != last_jh);
575
576 return freed;
577}
578
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586
587
588
589int __jbd2_journal_clean_checkpoint_list(journal_t *journal)
590{
591 transaction_t *transaction, *last_transaction, *next_transaction;
592 int ret = 0;
593 int released;
594
595 transaction = journal->j_checkpoint_transactions;
596 if (!transaction)
597 goto out;
598
599 last_transaction = transaction->t_cpprev;
600 next_transaction = transaction;
601 do {
602 transaction = next_transaction;
603 next_transaction = transaction->t_cpnext;
604 ret += journal_clean_one_cp_list(transaction->
605 t_checkpoint_list, &released);
606
607
608
609
610
611 if (need_resched())
612 goto out;
613 if (released)
614 continue;
615
616
617
618
619
620 ret += journal_clean_one_cp_list(transaction->
621 t_checkpoint_io_list, &released);
622 if (need_resched())
623 goto out;
624 } while (transaction != last_transaction);
625out:
626 return ret;
627}
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649int __jbd2_journal_remove_checkpoint(struct journal_head *jh)
650{
651 transaction_t *transaction;
652 journal_t *journal;
653 int ret = 0;
654
655 JBUFFER_TRACE(jh, "entry");
656
657 if ((transaction = jh->b_cp_transaction) == NULL) {
658 JBUFFER_TRACE(jh, "not on transaction");
659 goto out;
660 }
661 journal = transaction->t_journal;
662
663 __buffer_unlink(jh);
664 jh->b_cp_transaction = NULL;
665
666 if (transaction->t_checkpoint_list != NULL ||
667 transaction->t_checkpoint_io_list != NULL)
668 goto out;
669 JBUFFER_TRACE(jh, "transaction has no more buffers");
670
671
672
673
674
675
676
677
678
679
680 if (transaction->t_state != T_FINISHED) {
681 JBUFFER_TRACE(jh, "belongs to running/committing transaction");
682 goto out;
683 }
684
685
686
687
688 __jbd2_journal_drop_transaction(journal, transaction);
689
690
691
692 wake_up(&journal->j_wait_logspace);
693 ret = 1;
694out:
695 JBUFFER_TRACE(jh, "exit");
696 return ret;
697}
698
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701
702
703
704
705
706
707void __jbd2_journal_insert_checkpoint(struct journal_head *jh,
708 transaction_t *transaction)
709{
710 JBUFFER_TRACE(jh, "entry");
711 J_ASSERT_JH(jh, buffer_dirty(jh2bh(jh)) || buffer_jbddirty(jh2bh(jh)));
712 J_ASSERT_JH(jh, jh->b_cp_transaction == NULL);
713
714 jh->b_cp_transaction = transaction;
715
716 if (!transaction->t_checkpoint_list) {
717 jh->b_cpnext = jh->b_cpprev = jh;
718 } else {
719 jh->b_cpnext = transaction->t_checkpoint_list;
720 jh->b_cpprev = transaction->t_checkpoint_list->b_cpprev;
721 jh->b_cpprev->b_cpnext = jh;
722 jh->b_cpnext->b_cpprev = jh;
723 }
724 transaction->t_checkpoint_list = jh;
725}
726
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731
732
733
734
735
736
737void __jbd2_journal_drop_transaction(journal_t *journal, transaction_t *transaction)
738{
739 assert_spin_locked(&journal->j_list_lock);
740 if (transaction->t_cpnext) {
741 transaction->t_cpnext->t_cpprev = transaction->t_cpprev;
742 transaction->t_cpprev->t_cpnext = transaction->t_cpnext;
743 if (journal->j_checkpoint_transactions == transaction)
744 journal->j_checkpoint_transactions =
745 transaction->t_cpnext;
746 if (journal->j_checkpoint_transactions == transaction)
747 journal->j_checkpoint_transactions = NULL;
748 }
749
750 J_ASSERT(transaction->t_state == T_FINISHED);
751 J_ASSERT(transaction->t_buffers == NULL);
752 J_ASSERT(transaction->t_forget == NULL);
753 J_ASSERT(transaction->t_iobuf_list == NULL);
754 J_ASSERT(transaction->t_shadow_list == NULL);
755 J_ASSERT(transaction->t_log_list == NULL);
756 J_ASSERT(transaction->t_checkpoint_list == NULL);
757 J_ASSERT(transaction->t_checkpoint_io_list == NULL);
758 J_ASSERT(transaction->t_updates == 0);
759 J_ASSERT(journal->j_committing_transaction != transaction);
760 J_ASSERT(journal->j_running_transaction != transaction);
761
762 jbd_debug(1, "Dropping transaction %d, all done\n", transaction->t_tid);
763 kfree(transaction);
764}