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5
6
7#include <linux/sched.h>
8#include <linux/bio.h>
9#include <linux/slab.h>
10#include <linux/blkdev.h>
11#include <linux/raid/pq.h>
12#include <linux/hash.h>
13#include <linux/list_sort.h>
14#include <linux/raid/xor.h>
15#include <linux/mm.h>
16#include "ctree.h"
17#include "disk-io.h"
18#include "volumes.h"
19#include "raid56.h"
20#include "async-thread.h"
21
22
23#define RBIO_RMW_LOCKED_BIT 1
24
25
26
27
28
29#define RBIO_CACHE_BIT 2
30
31
32
33
34#define RBIO_CACHE_READY_BIT 3
35
36#define RBIO_CACHE_SIZE 1024
37
38#define BTRFS_STRIPE_HASH_TABLE_BITS 11
39
40
41struct btrfs_stripe_hash {
42 struct list_head hash_list;
43 spinlock_t lock;
44};
45
46
47struct btrfs_stripe_hash_table {
48 struct list_head stripe_cache;
49 spinlock_t cache_lock;
50 int cache_size;
51 struct btrfs_stripe_hash table[];
52};
53
54enum btrfs_rbio_ops {
55 BTRFS_RBIO_WRITE,
56 BTRFS_RBIO_READ_REBUILD,
57 BTRFS_RBIO_PARITY_SCRUB,
58 BTRFS_RBIO_REBUILD_MISSING,
59};
60
61struct btrfs_raid_bio {
62 struct btrfs_fs_info *fs_info;
63 struct btrfs_bio *bbio;
64
65
66
67
68
69
70 struct list_head hash_list;
71
72
73
74
75 struct list_head stripe_cache;
76
77
78
79
80 struct btrfs_work work;
81
82
83
84
85
86
87 struct bio_list bio_list;
88 spinlock_t bio_list_lock;
89
90
91
92
93
94
95
96 struct list_head plug_list;
97
98
99
100
101
102 unsigned long flags;
103
104
105 int stripe_len;
106
107
108 int nr_data;
109
110 int real_stripes;
111
112 int stripe_npages;
113
114
115
116
117
118
119 enum btrfs_rbio_ops operation;
120
121
122 int faila;
123
124
125 int failb;
126
127 int scrubp;
128
129
130
131
132 int nr_pages;
133
134
135
136
137
138
139 int bio_list_bytes;
140
141 int generic_bio_cnt;
142
143 refcount_t refs;
144
145 atomic_t stripes_pending;
146
147 atomic_t error;
148
149
150
151
152
153
154
155
156
157 struct page **stripe_pages;
158
159
160
161
162
163 struct page **bio_pages;
164
165
166
167
168 unsigned long *dbitmap;
169
170
171 void **finish_pointers;
172
173
174 unsigned long *finish_pbitmap;
175};
176
177static int __raid56_parity_recover(struct btrfs_raid_bio *rbio);
178static noinline void finish_rmw(struct btrfs_raid_bio *rbio);
179static void rmw_work(struct btrfs_work *work);
180static void read_rebuild_work(struct btrfs_work *work);
181static int fail_bio_stripe(struct btrfs_raid_bio *rbio, struct bio *bio);
182static int fail_rbio_index(struct btrfs_raid_bio *rbio, int failed);
183static void __free_raid_bio(struct btrfs_raid_bio *rbio);
184static void index_rbio_pages(struct btrfs_raid_bio *rbio);
185static int alloc_rbio_pages(struct btrfs_raid_bio *rbio);
186
187static noinline void finish_parity_scrub(struct btrfs_raid_bio *rbio,
188 int need_check);
189static void scrub_parity_work(struct btrfs_work *work);
190
191static void start_async_work(struct btrfs_raid_bio *rbio, btrfs_func_t work_func)
192{
193 btrfs_init_work(&rbio->work, work_func, NULL, NULL);
194 btrfs_queue_work(rbio->fs_info->rmw_workers, &rbio->work);
195}
196
197
198
199
200
201int btrfs_alloc_stripe_hash_table(struct btrfs_fs_info *info)
202{
203 struct btrfs_stripe_hash_table *table;
204 struct btrfs_stripe_hash_table *x;
205 struct btrfs_stripe_hash *cur;
206 struct btrfs_stripe_hash *h;
207 int num_entries = 1 << BTRFS_STRIPE_HASH_TABLE_BITS;
208 int i;
209
210 if (info->stripe_hash_table)
211 return 0;
212
213
214
215
216
217
218
219
220 table = kvzalloc(struct_size(table, table, num_entries), GFP_KERNEL);
221 if (!table)
222 return -ENOMEM;
223
224 spin_lock_init(&table->cache_lock);
225 INIT_LIST_HEAD(&table->stripe_cache);
226
227 h = table->table;
228
229 for (i = 0; i < num_entries; i++) {
230 cur = h + i;
231 INIT_LIST_HEAD(&cur->hash_list);
232 spin_lock_init(&cur->lock);
233 }
234
235 x = cmpxchg(&info->stripe_hash_table, NULL, table);
236 if (x)
237 kvfree(x);
238 return 0;
239}
240
241
242
243
244
245
246
247
248
249
250static void cache_rbio_pages(struct btrfs_raid_bio *rbio)
251{
252 int i;
253 char *s;
254 char *d;
255 int ret;
256
257 ret = alloc_rbio_pages(rbio);
258 if (ret)
259 return;
260
261 for (i = 0; i < rbio->nr_pages; i++) {
262 if (!rbio->bio_pages[i])
263 continue;
264
265 s = kmap(rbio->bio_pages[i]);
266 d = kmap(rbio->stripe_pages[i]);
267
268 copy_page(d, s);
269
270 kunmap(rbio->bio_pages[i]);
271 kunmap(rbio->stripe_pages[i]);
272 SetPageUptodate(rbio->stripe_pages[i]);
273 }
274 set_bit(RBIO_CACHE_READY_BIT, &rbio->flags);
275}
276
277
278
279
280static int rbio_bucket(struct btrfs_raid_bio *rbio)
281{
282 u64 num = rbio->bbio->raid_map[0];
283
284
285
286
287
288
289
290
291
292 return hash_64(num >> 16, BTRFS_STRIPE_HASH_TABLE_BITS);
293}
294
295
296
297
298
299static void steal_rbio(struct btrfs_raid_bio *src, struct btrfs_raid_bio *dest)
300{
301 int i;
302 struct page *s;
303 struct page *d;
304
305 if (!test_bit(RBIO_CACHE_READY_BIT, &src->flags))
306 return;
307
308 for (i = 0; i < dest->nr_pages; i++) {
309 s = src->stripe_pages[i];
310 if (!s || !PageUptodate(s)) {
311 continue;
312 }
313
314 d = dest->stripe_pages[i];
315 if (d)
316 __free_page(d);
317
318 dest->stripe_pages[i] = s;
319 src->stripe_pages[i] = NULL;
320 }
321}
322
323
324
325
326
327
328
329
330static void merge_rbio(struct btrfs_raid_bio *dest,
331 struct btrfs_raid_bio *victim)
332{
333 bio_list_merge(&dest->bio_list, &victim->bio_list);
334 dest->bio_list_bytes += victim->bio_list_bytes;
335 dest->generic_bio_cnt += victim->generic_bio_cnt;
336 bio_list_init(&victim->bio_list);
337}
338
339
340
341
342
343static void __remove_rbio_from_cache(struct btrfs_raid_bio *rbio)
344{
345 int bucket = rbio_bucket(rbio);
346 struct btrfs_stripe_hash_table *table;
347 struct btrfs_stripe_hash *h;
348 int freeit = 0;
349
350
351
352
353 if (!test_bit(RBIO_CACHE_BIT, &rbio->flags))
354 return;
355
356 table = rbio->fs_info->stripe_hash_table;
357 h = table->table + bucket;
358
359
360
361
362 spin_lock(&h->lock);
363
364
365
366
367
368 spin_lock(&rbio->bio_list_lock);
369
370 if (test_and_clear_bit(RBIO_CACHE_BIT, &rbio->flags)) {
371 list_del_init(&rbio->stripe_cache);
372 table->cache_size -= 1;
373 freeit = 1;
374
375
376
377
378
379
380
381
382
383
384 if (bio_list_empty(&rbio->bio_list)) {
385 if (!list_empty(&rbio->hash_list)) {
386 list_del_init(&rbio->hash_list);
387 refcount_dec(&rbio->refs);
388 BUG_ON(!list_empty(&rbio->plug_list));
389 }
390 }
391 }
392
393 spin_unlock(&rbio->bio_list_lock);
394 spin_unlock(&h->lock);
395
396 if (freeit)
397 __free_raid_bio(rbio);
398}
399
400
401
402
403static void remove_rbio_from_cache(struct btrfs_raid_bio *rbio)
404{
405 struct btrfs_stripe_hash_table *table;
406 unsigned long flags;
407
408 if (!test_bit(RBIO_CACHE_BIT, &rbio->flags))
409 return;
410
411 table = rbio->fs_info->stripe_hash_table;
412
413 spin_lock_irqsave(&table->cache_lock, flags);
414 __remove_rbio_from_cache(rbio);
415 spin_unlock_irqrestore(&table->cache_lock, flags);
416}
417
418
419
420
421static void btrfs_clear_rbio_cache(struct btrfs_fs_info *info)
422{
423 struct btrfs_stripe_hash_table *table;
424 unsigned long flags;
425 struct btrfs_raid_bio *rbio;
426
427 table = info->stripe_hash_table;
428
429 spin_lock_irqsave(&table->cache_lock, flags);
430 while (!list_empty(&table->stripe_cache)) {
431 rbio = list_entry(table->stripe_cache.next,
432 struct btrfs_raid_bio,
433 stripe_cache);
434 __remove_rbio_from_cache(rbio);
435 }
436 spin_unlock_irqrestore(&table->cache_lock, flags);
437}
438
439
440
441
442
443void btrfs_free_stripe_hash_table(struct btrfs_fs_info *info)
444{
445 if (!info->stripe_hash_table)
446 return;
447 btrfs_clear_rbio_cache(info);
448 kvfree(info->stripe_hash_table);
449 info->stripe_hash_table = NULL;
450}
451
452
453
454
455
456
457
458
459
460
461
462
463static void cache_rbio(struct btrfs_raid_bio *rbio)
464{
465 struct btrfs_stripe_hash_table *table;
466 unsigned long flags;
467
468 if (!test_bit(RBIO_CACHE_READY_BIT, &rbio->flags))
469 return;
470
471 table = rbio->fs_info->stripe_hash_table;
472
473 spin_lock_irqsave(&table->cache_lock, flags);
474 spin_lock(&rbio->bio_list_lock);
475
476
477 if (!test_and_set_bit(RBIO_CACHE_BIT, &rbio->flags))
478 refcount_inc(&rbio->refs);
479
480 if (!list_empty(&rbio->stripe_cache)){
481 list_move(&rbio->stripe_cache, &table->stripe_cache);
482 } else {
483 list_add(&rbio->stripe_cache, &table->stripe_cache);
484 table->cache_size += 1;
485 }
486
487 spin_unlock(&rbio->bio_list_lock);
488
489 if (table->cache_size > RBIO_CACHE_SIZE) {
490 struct btrfs_raid_bio *found;
491
492 found = list_entry(table->stripe_cache.prev,
493 struct btrfs_raid_bio,
494 stripe_cache);
495
496 if (found != rbio)
497 __remove_rbio_from_cache(found);
498 }
499
500 spin_unlock_irqrestore(&table->cache_lock, flags);
501}
502
503
504
505
506
507
508static void run_xor(void **pages, int src_cnt, ssize_t len)
509{
510 int src_off = 0;
511 int xor_src_cnt = 0;
512 void *dest = pages[src_cnt];
513
514 while(src_cnt > 0) {
515 xor_src_cnt = min(src_cnt, MAX_XOR_BLOCKS);
516 xor_blocks(xor_src_cnt, len, dest, pages + src_off);
517
518 src_cnt -= xor_src_cnt;
519 src_off += xor_src_cnt;
520 }
521}
522
523
524
525
526
527static int rbio_is_full(struct btrfs_raid_bio *rbio)
528{
529 unsigned long flags;
530 unsigned long size = rbio->bio_list_bytes;
531 int ret = 1;
532
533 spin_lock_irqsave(&rbio->bio_list_lock, flags);
534 if (size != rbio->nr_data * rbio->stripe_len)
535 ret = 0;
536 BUG_ON(size > rbio->nr_data * rbio->stripe_len);
537 spin_unlock_irqrestore(&rbio->bio_list_lock, flags);
538
539 return ret;
540}
541
542
543
544
545
546
547
548
549
550
551
552static int rbio_can_merge(struct btrfs_raid_bio *last,
553 struct btrfs_raid_bio *cur)
554{
555 if (test_bit(RBIO_RMW_LOCKED_BIT, &last->flags) ||
556 test_bit(RBIO_RMW_LOCKED_BIT, &cur->flags))
557 return 0;
558
559
560
561
562
563
564
565
566 if (test_bit(RBIO_CACHE_BIT, &last->flags) ||
567 test_bit(RBIO_CACHE_BIT, &cur->flags))
568 return 0;
569
570 if (last->bbio->raid_map[0] !=
571 cur->bbio->raid_map[0])
572 return 0;
573
574
575 if (last->operation != cur->operation)
576 return 0;
577
578
579
580
581
582
583
584
585 if (last->operation == BTRFS_RBIO_PARITY_SCRUB)
586 return 0;
587
588 if (last->operation == BTRFS_RBIO_REBUILD_MISSING)
589 return 0;
590
591 if (last->operation == BTRFS_RBIO_READ_REBUILD) {
592 int fa = last->faila;
593 int fb = last->failb;
594 int cur_fa = cur->faila;
595 int cur_fb = cur->failb;
596
597 if (last->faila >= last->failb) {
598 fa = last->failb;
599 fb = last->faila;
600 }
601
602 if (cur->faila >= cur->failb) {
603 cur_fa = cur->failb;
604 cur_fb = cur->faila;
605 }
606
607 if (fa != cur_fa || fb != cur_fb)
608 return 0;
609 }
610 return 1;
611}
612
613static int rbio_stripe_page_index(struct btrfs_raid_bio *rbio, int stripe,
614 int index)
615{
616 return stripe * rbio->stripe_npages + index;
617}
618
619
620
621
622
623static struct page *rbio_stripe_page(struct btrfs_raid_bio *rbio, int stripe,
624 int index)
625{
626 return rbio->stripe_pages[rbio_stripe_page_index(rbio, stripe, index)];
627}
628
629
630
631
632static struct page *rbio_pstripe_page(struct btrfs_raid_bio *rbio, int index)
633{
634 return rbio_stripe_page(rbio, rbio->nr_data, index);
635}
636
637
638
639
640
641static struct page *rbio_qstripe_page(struct btrfs_raid_bio *rbio, int index)
642{
643 if (rbio->nr_data + 1 == rbio->real_stripes)
644 return NULL;
645 return rbio_stripe_page(rbio, rbio->nr_data + 1, index);
646}
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670static noinline int lock_stripe_add(struct btrfs_raid_bio *rbio)
671{
672 struct btrfs_stripe_hash *h;
673 struct btrfs_raid_bio *cur;
674 struct btrfs_raid_bio *pending;
675 unsigned long flags;
676 struct btrfs_raid_bio *freeit = NULL;
677 struct btrfs_raid_bio *cache_drop = NULL;
678 int ret = 0;
679
680 h = rbio->fs_info->stripe_hash_table->table + rbio_bucket(rbio);
681
682 spin_lock_irqsave(&h->lock, flags);
683 list_for_each_entry(cur, &h->hash_list, hash_list) {
684 if (cur->bbio->raid_map[0] != rbio->bbio->raid_map[0])
685 continue;
686
687 spin_lock(&cur->bio_list_lock);
688
689
690 if (bio_list_empty(&cur->bio_list) &&
691 list_empty(&cur->plug_list) &&
692 test_bit(RBIO_CACHE_BIT, &cur->flags) &&
693 !test_bit(RBIO_RMW_LOCKED_BIT, &cur->flags)) {
694 list_del_init(&cur->hash_list);
695 refcount_dec(&cur->refs);
696
697 steal_rbio(cur, rbio);
698 cache_drop = cur;
699 spin_unlock(&cur->bio_list_lock);
700
701 goto lockit;
702 }
703
704
705 if (rbio_can_merge(cur, rbio)) {
706 merge_rbio(cur, rbio);
707 spin_unlock(&cur->bio_list_lock);
708 freeit = rbio;
709 ret = 1;
710 goto out;
711 }
712
713
714
715
716
717
718
719 list_for_each_entry(pending, &cur->plug_list, plug_list) {
720 if (rbio_can_merge(pending, rbio)) {
721 merge_rbio(pending, rbio);
722 spin_unlock(&cur->bio_list_lock);
723 freeit = rbio;
724 ret = 1;
725 goto out;
726 }
727 }
728
729
730
731
732
733 list_add_tail(&rbio->plug_list, &cur->plug_list);
734 spin_unlock(&cur->bio_list_lock);
735 ret = 1;
736 goto out;
737 }
738lockit:
739 refcount_inc(&rbio->refs);
740 list_add(&rbio->hash_list, &h->hash_list);
741out:
742 spin_unlock_irqrestore(&h->lock, flags);
743 if (cache_drop)
744 remove_rbio_from_cache(cache_drop);
745 if (freeit)
746 __free_raid_bio(freeit);
747 return ret;
748}
749
750
751
752
753
754static noinline void unlock_stripe(struct btrfs_raid_bio *rbio)
755{
756 int bucket;
757 struct btrfs_stripe_hash *h;
758 unsigned long flags;
759 int keep_cache = 0;
760
761 bucket = rbio_bucket(rbio);
762 h = rbio->fs_info->stripe_hash_table->table + bucket;
763
764 if (list_empty(&rbio->plug_list))
765 cache_rbio(rbio);
766
767 spin_lock_irqsave(&h->lock, flags);
768 spin_lock(&rbio->bio_list_lock);
769
770 if (!list_empty(&rbio->hash_list)) {
771
772
773
774
775
776 if (list_empty(&rbio->plug_list) &&
777 test_bit(RBIO_CACHE_BIT, &rbio->flags)) {
778 keep_cache = 1;
779 clear_bit(RBIO_RMW_LOCKED_BIT, &rbio->flags);
780 BUG_ON(!bio_list_empty(&rbio->bio_list));
781 goto done;
782 }
783
784 list_del_init(&rbio->hash_list);
785 refcount_dec(&rbio->refs);
786
787
788
789
790
791
792 if (!list_empty(&rbio->plug_list)) {
793 struct btrfs_raid_bio *next;
794 struct list_head *head = rbio->plug_list.next;
795
796 next = list_entry(head, struct btrfs_raid_bio,
797 plug_list);
798
799 list_del_init(&rbio->plug_list);
800
801 list_add(&next->hash_list, &h->hash_list);
802 refcount_inc(&next->refs);
803 spin_unlock(&rbio->bio_list_lock);
804 spin_unlock_irqrestore(&h->lock, flags);
805
806 if (next->operation == BTRFS_RBIO_READ_REBUILD)
807 start_async_work(next, read_rebuild_work);
808 else if (next->operation == BTRFS_RBIO_REBUILD_MISSING) {
809 steal_rbio(rbio, next);
810 start_async_work(next, read_rebuild_work);
811 } else if (next->operation == BTRFS_RBIO_WRITE) {
812 steal_rbio(rbio, next);
813 start_async_work(next, rmw_work);
814 } else if (next->operation == BTRFS_RBIO_PARITY_SCRUB) {
815 steal_rbio(rbio, next);
816 start_async_work(next, scrub_parity_work);
817 }
818
819 goto done_nolock;
820 }
821 }
822done:
823 spin_unlock(&rbio->bio_list_lock);
824 spin_unlock_irqrestore(&h->lock, flags);
825
826done_nolock:
827 if (!keep_cache)
828 remove_rbio_from_cache(rbio);
829}
830
831static void __free_raid_bio(struct btrfs_raid_bio *rbio)
832{
833 int i;
834
835 if (!refcount_dec_and_test(&rbio->refs))
836 return;
837
838 WARN_ON(!list_empty(&rbio->stripe_cache));
839 WARN_ON(!list_empty(&rbio->hash_list));
840 WARN_ON(!bio_list_empty(&rbio->bio_list));
841
842 for (i = 0; i < rbio->nr_pages; i++) {
843 if (rbio->stripe_pages[i]) {
844 __free_page(rbio->stripe_pages[i]);
845 rbio->stripe_pages[i] = NULL;
846 }
847 }
848
849 btrfs_put_bbio(rbio->bbio);
850 kfree(rbio);
851}
852
853static void rbio_endio_bio_list(struct bio *cur, blk_status_t err)
854{
855 struct bio *next;
856
857 while (cur) {
858 next = cur->bi_next;
859 cur->bi_next = NULL;
860 cur->bi_status = err;
861 bio_endio(cur);
862 cur = next;
863 }
864}
865
866
867
868
869
870static void rbio_orig_end_io(struct btrfs_raid_bio *rbio, blk_status_t err)
871{
872 struct bio *cur = bio_list_get(&rbio->bio_list);
873 struct bio *extra;
874
875 if (rbio->generic_bio_cnt)
876 btrfs_bio_counter_sub(rbio->fs_info, rbio->generic_bio_cnt);
877
878
879
880
881
882
883
884
885
886 unlock_stripe(rbio);
887 extra = bio_list_get(&rbio->bio_list);
888 __free_raid_bio(rbio);
889
890 rbio_endio_bio_list(cur, err);
891 if (extra)
892 rbio_endio_bio_list(extra, err);
893}
894
895
896
897
898
899static void raid_write_end_io(struct bio *bio)
900{
901 struct btrfs_raid_bio *rbio = bio->bi_private;
902 blk_status_t err = bio->bi_status;
903 int max_errors;
904
905 if (err)
906 fail_bio_stripe(rbio, bio);
907
908 bio_put(bio);
909
910 if (!atomic_dec_and_test(&rbio->stripes_pending))
911 return;
912
913 err = BLK_STS_OK;
914
915
916 max_errors = (rbio->operation == BTRFS_RBIO_PARITY_SCRUB) ?
917 0 : rbio->bbio->max_errors;
918 if (atomic_read(&rbio->error) > max_errors)
919 err = BLK_STS_IOERR;
920
921 rbio_orig_end_io(rbio, err);
922}
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940static struct page *page_in_rbio(struct btrfs_raid_bio *rbio,
941 int index, int pagenr, int bio_list_only)
942{
943 int chunk_page;
944 struct page *p = NULL;
945
946 chunk_page = index * (rbio->stripe_len >> PAGE_SHIFT) + pagenr;
947
948 spin_lock_irq(&rbio->bio_list_lock);
949 p = rbio->bio_pages[chunk_page];
950 spin_unlock_irq(&rbio->bio_list_lock);
951
952 if (p || bio_list_only)
953 return p;
954
955 return rbio->stripe_pages[chunk_page];
956}
957
958
959
960
961
962static unsigned long rbio_nr_pages(unsigned long stripe_len, int nr_stripes)
963{
964 return DIV_ROUND_UP(stripe_len, PAGE_SIZE) * nr_stripes;
965}
966
967
968
969
970
971static struct btrfs_raid_bio *alloc_rbio(struct btrfs_fs_info *fs_info,
972 struct btrfs_bio *bbio,
973 u64 stripe_len)
974{
975 struct btrfs_raid_bio *rbio;
976 int nr_data = 0;
977 int real_stripes = bbio->num_stripes - bbio->num_tgtdevs;
978 int num_pages = rbio_nr_pages(stripe_len, real_stripes);
979 int stripe_npages = DIV_ROUND_UP(stripe_len, PAGE_SIZE);
980 void *p;
981
982 rbio = kzalloc(sizeof(*rbio) +
983 sizeof(*rbio->stripe_pages) * num_pages +
984 sizeof(*rbio->bio_pages) * num_pages +
985 sizeof(*rbio->finish_pointers) * real_stripes +
986 sizeof(*rbio->dbitmap) * BITS_TO_LONGS(stripe_npages) +
987 sizeof(*rbio->finish_pbitmap) *
988 BITS_TO_LONGS(stripe_npages),
989 GFP_NOFS);
990 if (!rbio)
991 return ERR_PTR(-ENOMEM);
992
993 bio_list_init(&rbio->bio_list);
994 INIT_LIST_HEAD(&rbio->plug_list);
995 spin_lock_init(&rbio->bio_list_lock);
996 INIT_LIST_HEAD(&rbio->stripe_cache);
997 INIT_LIST_HEAD(&rbio->hash_list);
998 rbio->bbio = bbio;
999 rbio->fs_info = fs_info;
1000 rbio->stripe_len = stripe_len;
1001 rbio->nr_pages = num_pages;
1002 rbio->real_stripes = real_stripes;
1003 rbio->stripe_npages = stripe_npages;
1004 rbio->faila = -1;
1005 rbio->failb = -1;
1006 refcount_set(&rbio->refs, 1);
1007 atomic_set(&rbio->error, 0);
1008 atomic_set(&rbio->stripes_pending, 0);
1009
1010
1011
1012
1013
1014 p = rbio + 1;
1015#define CONSUME_ALLOC(ptr, count) do { \
1016 ptr = p; \
1017 p = (unsigned char *)p + sizeof(*(ptr)) * (count); \
1018 } while (0)
1019 CONSUME_ALLOC(rbio->stripe_pages, num_pages);
1020 CONSUME_ALLOC(rbio->bio_pages, num_pages);
1021 CONSUME_ALLOC(rbio->finish_pointers, real_stripes);
1022 CONSUME_ALLOC(rbio->dbitmap, BITS_TO_LONGS(stripe_npages));
1023 CONSUME_ALLOC(rbio->finish_pbitmap, BITS_TO_LONGS(stripe_npages));
1024#undef CONSUME_ALLOC
1025
1026 if (bbio->map_type & BTRFS_BLOCK_GROUP_RAID5)
1027 nr_data = real_stripes - 1;
1028 else if (bbio->map_type & BTRFS_BLOCK_GROUP_RAID6)
1029 nr_data = real_stripes - 2;
1030 else
1031 BUG();
1032
1033 rbio->nr_data = nr_data;
1034 return rbio;
1035}
1036
1037
1038static int alloc_rbio_pages(struct btrfs_raid_bio *rbio)
1039{
1040 int i;
1041 struct page *page;
1042
1043 for (i = 0; i < rbio->nr_pages; i++) {
1044 if (rbio->stripe_pages[i])
1045 continue;
1046 page = alloc_page(GFP_NOFS | __GFP_HIGHMEM);
1047 if (!page)
1048 return -ENOMEM;
1049 rbio->stripe_pages[i] = page;
1050 }
1051 return 0;
1052}
1053
1054
1055static int alloc_rbio_parity_pages(struct btrfs_raid_bio *rbio)
1056{
1057 int i;
1058 struct page *page;
1059
1060 i = rbio_stripe_page_index(rbio, rbio->nr_data, 0);
1061
1062 for (; i < rbio->nr_pages; i++) {
1063 if (rbio->stripe_pages[i])
1064 continue;
1065 page = alloc_page(GFP_NOFS | __GFP_HIGHMEM);
1066 if (!page)
1067 return -ENOMEM;
1068 rbio->stripe_pages[i] = page;
1069 }
1070 return 0;
1071}
1072
1073
1074
1075
1076
1077
1078static int rbio_add_io_page(struct btrfs_raid_bio *rbio,
1079 struct bio_list *bio_list,
1080 struct page *page,
1081 int stripe_nr,
1082 unsigned long page_index,
1083 unsigned long bio_max_len)
1084{
1085 struct bio *last = bio_list->tail;
1086 u64 last_end = 0;
1087 int ret;
1088 struct bio *bio;
1089 struct btrfs_bio_stripe *stripe;
1090 u64 disk_start;
1091
1092 stripe = &rbio->bbio->stripes[stripe_nr];
1093 disk_start = stripe->physical + (page_index << PAGE_SHIFT);
1094
1095
1096 if (!stripe->dev->bdev)
1097 return fail_rbio_index(rbio, stripe_nr);
1098
1099
1100 if (last) {
1101 last_end = (u64)last->bi_iter.bi_sector << 9;
1102 last_end += last->bi_iter.bi_size;
1103
1104
1105
1106
1107
1108 if (last_end == disk_start && stripe->dev->bdev &&
1109 !last->bi_status &&
1110 last->bi_disk == stripe->dev->bdev->bd_disk &&
1111 last->bi_partno == stripe->dev->bdev->bd_partno) {
1112 ret = bio_add_page(last, page, PAGE_SIZE, 0);
1113 if (ret == PAGE_SIZE)
1114 return 0;
1115 }
1116 }
1117
1118
1119 bio = btrfs_io_bio_alloc(bio_max_len >> PAGE_SHIFT ?: 1);
1120 bio->bi_iter.bi_size = 0;
1121 bio_set_dev(bio, stripe->dev->bdev);
1122 bio->bi_iter.bi_sector = disk_start >> 9;
1123
1124 bio_add_page(bio, page, PAGE_SIZE, 0);
1125 bio_list_add(bio_list, bio);
1126 return 0;
1127}
1128
1129
1130
1131
1132
1133
1134
1135
1136static void validate_rbio_for_rmw(struct btrfs_raid_bio *rbio)
1137{
1138 if (rbio->faila >= 0 || rbio->failb >= 0) {
1139 BUG_ON(rbio->faila == rbio->real_stripes - 1);
1140 __raid56_parity_recover(rbio);
1141 } else {
1142 finish_rmw(rbio);
1143 }
1144}
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154static void index_rbio_pages(struct btrfs_raid_bio *rbio)
1155{
1156 struct bio *bio;
1157 u64 start;
1158 unsigned long stripe_offset;
1159 unsigned long page_index;
1160
1161 spin_lock_irq(&rbio->bio_list_lock);
1162 bio_list_for_each(bio, &rbio->bio_list) {
1163 struct bio_vec bvec;
1164 struct bvec_iter iter;
1165 int i = 0;
1166
1167 start = (u64)bio->bi_iter.bi_sector << 9;
1168 stripe_offset = start - rbio->bbio->raid_map[0];
1169 page_index = stripe_offset >> PAGE_SHIFT;
1170
1171 if (bio_flagged(bio, BIO_CLONED))
1172 bio->bi_iter = btrfs_io_bio(bio)->iter;
1173
1174 bio_for_each_segment(bvec, bio, iter) {
1175 rbio->bio_pages[page_index + i] = bvec.bv_page;
1176 i++;
1177 }
1178 }
1179 spin_unlock_irq(&rbio->bio_list_lock);
1180}
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190static noinline void finish_rmw(struct btrfs_raid_bio *rbio)
1191{
1192 struct btrfs_bio *bbio = rbio->bbio;
1193 void **pointers = rbio->finish_pointers;
1194 int nr_data = rbio->nr_data;
1195 int stripe;
1196 int pagenr;
1197 bool has_qstripe;
1198 struct bio_list bio_list;
1199 struct bio *bio;
1200 int ret;
1201
1202 bio_list_init(&bio_list);
1203
1204 if (rbio->real_stripes - rbio->nr_data == 1)
1205 has_qstripe = false;
1206 else if (rbio->real_stripes - rbio->nr_data == 2)
1207 has_qstripe = true;
1208 else
1209 BUG();
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219 spin_lock_irq(&rbio->bio_list_lock);
1220 set_bit(RBIO_RMW_LOCKED_BIT, &rbio->flags);
1221 spin_unlock_irq(&rbio->bio_list_lock);
1222
1223 atomic_set(&rbio->error, 0);
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234 index_rbio_pages(rbio);
1235 if (!rbio_is_full(rbio))
1236 cache_rbio_pages(rbio);
1237 else
1238 clear_bit(RBIO_CACHE_READY_BIT, &rbio->flags);
1239
1240 for (pagenr = 0; pagenr < rbio->stripe_npages; pagenr++) {
1241 struct page *p;
1242
1243 for (stripe = 0; stripe < nr_data; stripe++) {
1244 p = page_in_rbio(rbio, stripe, pagenr, 0);
1245 pointers[stripe] = kmap(p);
1246 }
1247
1248
1249 p = rbio_pstripe_page(rbio, pagenr);
1250 SetPageUptodate(p);
1251 pointers[stripe++] = kmap(p);
1252
1253 if (has_qstripe) {
1254
1255
1256
1257
1258
1259 p = rbio_qstripe_page(rbio, pagenr);
1260 SetPageUptodate(p);
1261 pointers[stripe++] = kmap(p);
1262
1263 raid6_call.gen_syndrome(rbio->real_stripes, PAGE_SIZE,
1264 pointers);
1265 } else {
1266
1267 copy_page(pointers[nr_data], pointers[0]);
1268 run_xor(pointers + 1, nr_data - 1, PAGE_SIZE);
1269 }
1270
1271
1272 for (stripe = 0; stripe < rbio->real_stripes; stripe++)
1273 kunmap(page_in_rbio(rbio, stripe, pagenr, 0));
1274 }
1275
1276
1277
1278
1279
1280
1281 for (stripe = 0; stripe < rbio->real_stripes; stripe++) {
1282 for (pagenr = 0; pagenr < rbio->stripe_npages; pagenr++) {
1283 struct page *page;
1284 if (stripe < rbio->nr_data) {
1285 page = page_in_rbio(rbio, stripe, pagenr, 1);
1286 if (!page)
1287 continue;
1288 } else {
1289 page = rbio_stripe_page(rbio, stripe, pagenr);
1290 }
1291
1292 ret = rbio_add_io_page(rbio, &bio_list,
1293 page, stripe, pagenr, rbio->stripe_len);
1294 if (ret)
1295 goto cleanup;
1296 }
1297 }
1298
1299 if (likely(!bbio->num_tgtdevs))
1300 goto write_data;
1301
1302 for (stripe = 0; stripe < rbio->real_stripes; stripe++) {
1303 if (!bbio->tgtdev_map[stripe])
1304 continue;
1305
1306 for (pagenr = 0; pagenr < rbio->stripe_npages; pagenr++) {
1307 struct page *page;
1308 if (stripe < rbio->nr_data) {
1309 page = page_in_rbio(rbio, stripe, pagenr, 1);
1310 if (!page)
1311 continue;
1312 } else {
1313 page = rbio_stripe_page(rbio, stripe, pagenr);
1314 }
1315
1316 ret = rbio_add_io_page(rbio, &bio_list, page,
1317 rbio->bbio->tgtdev_map[stripe],
1318 pagenr, rbio->stripe_len);
1319 if (ret)
1320 goto cleanup;
1321 }
1322 }
1323
1324write_data:
1325 atomic_set(&rbio->stripes_pending, bio_list_size(&bio_list));
1326 BUG_ON(atomic_read(&rbio->stripes_pending) == 0);
1327
1328 while (1) {
1329 bio = bio_list_pop(&bio_list);
1330 if (!bio)
1331 break;
1332
1333 bio->bi_private = rbio;
1334 bio->bi_end_io = raid_write_end_io;
1335 bio->bi_opf = REQ_OP_WRITE;
1336
1337 submit_bio(bio);
1338 }
1339 return;
1340
1341cleanup:
1342 rbio_orig_end_io(rbio, BLK_STS_IOERR);
1343
1344 while ((bio = bio_list_pop(&bio_list)))
1345 bio_put(bio);
1346}
1347
1348
1349
1350
1351
1352
1353static int find_bio_stripe(struct btrfs_raid_bio *rbio,
1354 struct bio *bio)
1355{
1356 u64 physical = bio->bi_iter.bi_sector;
1357 u64 stripe_start;
1358 int i;
1359 struct btrfs_bio_stripe *stripe;
1360
1361 physical <<= 9;
1362
1363 for (i = 0; i < rbio->bbio->num_stripes; i++) {
1364 stripe = &rbio->bbio->stripes[i];
1365 stripe_start = stripe->physical;
1366 if (physical >= stripe_start &&
1367 physical < stripe_start + rbio->stripe_len &&
1368 stripe->dev->bdev &&
1369 bio->bi_disk == stripe->dev->bdev->bd_disk &&
1370 bio->bi_partno == stripe->dev->bdev->bd_partno) {
1371 return i;
1372 }
1373 }
1374 return -1;
1375}
1376
1377
1378
1379
1380
1381
1382static int find_logical_bio_stripe(struct btrfs_raid_bio *rbio,
1383 struct bio *bio)
1384{
1385 u64 logical = bio->bi_iter.bi_sector;
1386 u64 stripe_start;
1387 int i;
1388
1389 logical <<= 9;
1390
1391 for (i = 0; i < rbio->nr_data; i++) {
1392 stripe_start = rbio->bbio->raid_map[i];
1393 if (logical >= stripe_start &&
1394 logical < stripe_start + rbio->stripe_len) {
1395 return i;
1396 }
1397 }
1398 return -1;
1399}
1400
1401
1402
1403
1404static int fail_rbio_index(struct btrfs_raid_bio *rbio, int failed)
1405{
1406 unsigned long flags;
1407 int ret = 0;
1408
1409 spin_lock_irqsave(&rbio->bio_list_lock, flags);
1410
1411
1412 if (rbio->faila == failed || rbio->failb == failed)
1413 goto out;
1414
1415 if (rbio->faila == -1) {
1416
1417 rbio->faila = failed;
1418 atomic_inc(&rbio->error);
1419 } else if (rbio->failb == -1) {
1420
1421 rbio->failb = failed;
1422 atomic_inc(&rbio->error);
1423 } else {
1424 ret = -EIO;
1425 }
1426out:
1427 spin_unlock_irqrestore(&rbio->bio_list_lock, flags);
1428
1429 return ret;
1430}
1431
1432
1433
1434
1435
1436static int fail_bio_stripe(struct btrfs_raid_bio *rbio,
1437 struct bio *bio)
1438{
1439 int failed = find_bio_stripe(rbio, bio);
1440
1441 if (failed < 0)
1442 return -EIO;
1443
1444 return fail_rbio_index(rbio, failed);
1445}
1446
1447
1448
1449
1450
1451static void set_bio_pages_uptodate(struct bio *bio)
1452{
1453 struct bio_vec *bvec;
1454 struct bvec_iter_all iter_all;
1455
1456 ASSERT(!bio_flagged(bio, BIO_CLONED));
1457
1458 bio_for_each_segment_all(bvec, bio, iter_all)
1459 SetPageUptodate(bvec->bv_page);
1460}
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470static void raid_rmw_end_io(struct bio *bio)
1471{
1472 struct btrfs_raid_bio *rbio = bio->bi_private;
1473
1474 if (bio->bi_status)
1475 fail_bio_stripe(rbio, bio);
1476 else
1477 set_bio_pages_uptodate(bio);
1478
1479 bio_put(bio);
1480
1481 if (!atomic_dec_and_test(&rbio->stripes_pending))
1482 return;
1483
1484 if (atomic_read(&rbio->error) > rbio->bbio->max_errors)
1485 goto cleanup;
1486
1487
1488
1489
1490
1491
1492 validate_rbio_for_rmw(rbio);
1493 return;
1494
1495cleanup:
1496
1497 rbio_orig_end_io(rbio, BLK_STS_IOERR);
1498}
1499
1500
1501
1502
1503
1504static int raid56_rmw_stripe(struct btrfs_raid_bio *rbio)
1505{
1506 int bios_to_read = 0;
1507 struct bio_list bio_list;
1508 int ret;
1509 int pagenr;
1510 int stripe;
1511 struct bio *bio;
1512
1513 bio_list_init(&bio_list);
1514
1515 ret = alloc_rbio_pages(rbio);
1516 if (ret)
1517 goto cleanup;
1518
1519 index_rbio_pages(rbio);
1520
1521 atomic_set(&rbio->error, 0);
1522
1523
1524
1525
1526 for (stripe = 0; stripe < rbio->nr_data; stripe++) {
1527 for (pagenr = 0; pagenr < rbio->stripe_npages; pagenr++) {
1528 struct page *page;
1529
1530
1531
1532
1533
1534
1535 page = page_in_rbio(rbio, stripe, pagenr, 1);
1536 if (page)
1537 continue;
1538
1539 page = rbio_stripe_page(rbio, stripe, pagenr);
1540
1541
1542
1543
1544 if (PageUptodate(page))
1545 continue;
1546
1547 ret = rbio_add_io_page(rbio, &bio_list, page,
1548 stripe, pagenr, rbio->stripe_len);
1549 if (ret)
1550 goto cleanup;
1551 }
1552 }
1553
1554 bios_to_read = bio_list_size(&bio_list);
1555 if (!bios_to_read) {
1556
1557
1558
1559
1560
1561
1562 goto finish;
1563 }
1564
1565
1566
1567
1568
1569 atomic_set(&rbio->stripes_pending, bios_to_read);
1570 while (1) {
1571 bio = bio_list_pop(&bio_list);
1572 if (!bio)
1573 break;
1574
1575 bio->bi_private = rbio;
1576 bio->bi_end_io = raid_rmw_end_io;
1577 bio->bi_opf = REQ_OP_READ;
1578
1579 btrfs_bio_wq_end_io(rbio->fs_info, bio, BTRFS_WQ_ENDIO_RAID56);
1580
1581 submit_bio(bio);
1582 }
1583
1584 return 0;
1585
1586cleanup:
1587 rbio_orig_end_io(rbio, BLK_STS_IOERR);
1588
1589 while ((bio = bio_list_pop(&bio_list)))
1590 bio_put(bio);
1591
1592 return -EIO;
1593
1594finish:
1595 validate_rbio_for_rmw(rbio);
1596 return 0;
1597}
1598
1599
1600
1601
1602
1603static int full_stripe_write(struct btrfs_raid_bio *rbio)
1604{
1605 int ret;
1606
1607 ret = alloc_rbio_parity_pages(rbio);
1608 if (ret) {
1609 __free_raid_bio(rbio);
1610 return ret;
1611 }
1612
1613 ret = lock_stripe_add(rbio);
1614 if (ret == 0)
1615 finish_rmw(rbio);
1616 return 0;
1617}
1618
1619
1620
1621
1622
1623
1624static int partial_stripe_write(struct btrfs_raid_bio *rbio)
1625{
1626 int ret;
1627
1628 ret = lock_stripe_add(rbio);
1629 if (ret == 0)
1630 start_async_work(rbio, rmw_work);
1631 return 0;
1632}
1633
1634
1635
1636
1637
1638
1639
1640static int __raid56_parity_write(struct btrfs_raid_bio *rbio)
1641{
1642
1643 if (!rbio_is_full(rbio))
1644 return partial_stripe_write(rbio);
1645 return full_stripe_write(rbio);
1646}
1647
1648
1649
1650
1651
1652
1653
1654
1655struct btrfs_plug_cb {
1656 struct blk_plug_cb cb;
1657 struct btrfs_fs_info *info;
1658 struct list_head rbio_list;
1659 struct btrfs_work work;
1660};
1661
1662
1663
1664
1665static int plug_cmp(void *priv, struct list_head *a, struct list_head *b)
1666{
1667 struct btrfs_raid_bio *ra = container_of(a, struct btrfs_raid_bio,
1668 plug_list);
1669 struct btrfs_raid_bio *rb = container_of(b, struct btrfs_raid_bio,
1670 plug_list);
1671 u64 a_sector = ra->bio_list.head->bi_iter.bi_sector;
1672 u64 b_sector = rb->bio_list.head->bi_iter.bi_sector;
1673
1674 if (a_sector < b_sector)
1675 return -1;
1676 if (a_sector > b_sector)
1677 return 1;
1678 return 0;
1679}
1680
1681static void run_plug(struct btrfs_plug_cb *plug)
1682{
1683 struct btrfs_raid_bio *cur;
1684 struct btrfs_raid_bio *last = NULL;
1685
1686
1687
1688
1689
1690
1691 list_sort(NULL, &plug->rbio_list, plug_cmp);
1692 while (!list_empty(&plug->rbio_list)) {
1693 cur = list_entry(plug->rbio_list.next,
1694 struct btrfs_raid_bio, plug_list);
1695 list_del_init(&cur->plug_list);
1696
1697 if (rbio_is_full(cur)) {
1698 int ret;
1699
1700
1701 ret = full_stripe_write(cur);
1702 BUG_ON(ret);
1703 continue;
1704 }
1705 if (last) {
1706 if (rbio_can_merge(last, cur)) {
1707 merge_rbio(last, cur);
1708 __free_raid_bio(cur);
1709 continue;
1710
1711 }
1712 __raid56_parity_write(last);
1713 }
1714 last = cur;
1715 }
1716 if (last) {
1717 __raid56_parity_write(last);
1718 }
1719 kfree(plug);
1720}
1721
1722
1723
1724
1725
1726static void unplug_work(struct btrfs_work *work)
1727{
1728 struct btrfs_plug_cb *plug;
1729 plug = container_of(work, struct btrfs_plug_cb, work);
1730 run_plug(plug);
1731}
1732
1733static void btrfs_raid_unplug(struct blk_plug_cb *cb, bool from_schedule)
1734{
1735 struct btrfs_plug_cb *plug;
1736 plug = container_of(cb, struct btrfs_plug_cb, cb);
1737
1738 if (from_schedule) {
1739 btrfs_init_work(&plug->work, unplug_work, NULL, NULL);
1740 btrfs_queue_work(plug->info->rmw_workers,
1741 &plug->work);
1742 return;
1743 }
1744 run_plug(plug);
1745}
1746
1747
1748
1749
1750int raid56_parity_write(struct btrfs_fs_info *fs_info, struct bio *bio,
1751 struct btrfs_bio *bbio, u64 stripe_len)
1752{
1753 struct btrfs_raid_bio *rbio;
1754 struct btrfs_plug_cb *plug = NULL;
1755 struct blk_plug_cb *cb;
1756 int ret;
1757
1758 rbio = alloc_rbio(fs_info, bbio, stripe_len);
1759 if (IS_ERR(rbio)) {
1760 btrfs_put_bbio(bbio);
1761 return PTR_ERR(rbio);
1762 }
1763 bio_list_add(&rbio->bio_list, bio);
1764 rbio->bio_list_bytes = bio->bi_iter.bi_size;
1765 rbio->operation = BTRFS_RBIO_WRITE;
1766
1767 btrfs_bio_counter_inc_noblocked(fs_info);
1768 rbio->generic_bio_cnt = 1;
1769
1770
1771
1772
1773
1774 if (rbio_is_full(rbio)) {
1775 ret = full_stripe_write(rbio);
1776 if (ret)
1777 btrfs_bio_counter_dec(fs_info);
1778 return ret;
1779 }
1780
1781 cb = blk_check_plugged(btrfs_raid_unplug, fs_info, sizeof(*plug));
1782 if (cb) {
1783 plug = container_of(cb, struct btrfs_plug_cb, cb);
1784 if (!plug->info) {
1785 plug->info = fs_info;
1786 INIT_LIST_HEAD(&plug->rbio_list);
1787 }
1788 list_add_tail(&rbio->plug_list, &plug->rbio_list);
1789 ret = 0;
1790 } else {
1791 ret = __raid56_parity_write(rbio);
1792 if (ret)
1793 btrfs_bio_counter_dec(fs_info);
1794 }
1795 return ret;
1796}
1797
1798
1799
1800
1801
1802
1803static void __raid_recover_end_io(struct btrfs_raid_bio *rbio)
1804{
1805 int pagenr, stripe;
1806 void **pointers;
1807 int faila = -1, failb = -1;
1808 struct page *page;
1809 blk_status_t err;
1810 int i;
1811
1812 pointers = kcalloc(rbio->real_stripes, sizeof(void *), GFP_NOFS);
1813 if (!pointers) {
1814 err = BLK_STS_RESOURCE;
1815 goto cleanup_io;
1816 }
1817
1818 faila = rbio->faila;
1819 failb = rbio->failb;
1820
1821 if (rbio->operation == BTRFS_RBIO_READ_REBUILD ||
1822 rbio->operation == BTRFS_RBIO_REBUILD_MISSING) {
1823 spin_lock_irq(&rbio->bio_list_lock);
1824 set_bit(RBIO_RMW_LOCKED_BIT, &rbio->flags);
1825 spin_unlock_irq(&rbio->bio_list_lock);
1826 }
1827
1828 index_rbio_pages(rbio);
1829
1830 for (pagenr = 0; pagenr < rbio->stripe_npages; pagenr++) {
1831
1832
1833
1834
1835 if (rbio->operation == BTRFS_RBIO_PARITY_SCRUB &&
1836 !test_bit(pagenr, rbio->dbitmap))
1837 continue;
1838
1839
1840
1841
1842 for (stripe = 0; stripe < rbio->real_stripes; stripe++) {
1843
1844
1845
1846
1847 if ((rbio->operation == BTRFS_RBIO_READ_REBUILD ||
1848 rbio->operation == BTRFS_RBIO_REBUILD_MISSING) &&
1849 (stripe == faila || stripe == failb)) {
1850 page = page_in_rbio(rbio, stripe, pagenr, 0);
1851 } else {
1852 page = rbio_stripe_page(rbio, stripe, pagenr);
1853 }
1854 pointers[stripe] = kmap(page);
1855 }
1856
1857
1858 if (rbio->bbio->map_type & BTRFS_BLOCK_GROUP_RAID6) {
1859
1860
1861
1862
1863 if (failb < 0) {
1864 if (faila == rbio->nr_data) {
1865
1866
1867
1868
1869
1870 err = BLK_STS_IOERR;
1871 goto cleanup;
1872 }
1873
1874
1875
1876
1877 goto pstripe;
1878 }
1879
1880
1881 if (faila > failb) {
1882 int tmp = failb;
1883 failb = faila;
1884 faila = tmp;
1885 }
1886
1887
1888
1889
1890
1891
1892
1893 if (rbio->bbio->raid_map[failb] == RAID6_Q_STRIPE) {
1894 if (rbio->bbio->raid_map[faila] ==
1895 RAID5_P_STRIPE) {
1896 err = BLK_STS_IOERR;
1897 goto cleanup;
1898 }
1899
1900
1901
1902
1903 goto pstripe;
1904 }
1905
1906 if (rbio->bbio->raid_map[failb] == RAID5_P_STRIPE) {
1907 raid6_datap_recov(rbio->real_stripes,
1908 PAGE_SIZE, faila, pointers);
1909 } else {
1910 raid6_2data_recov(rbio->real_stripes,
1911 PAGE_SIZE, faila, failb,
1912 pointers);
1913 }
1914 } else {
1915 void *p;
1916
1917
1918 BUG_ON(failb != -1);
1919pstripe:
1920
1921 copy_page(pointers[faila], pointers[rbio->nr_data]);
1922
1923
1924 p = pointers[faila];
1925 for (stripe = faila; stripe < rbio->nr_data - 1; stripe++)
1926 pointers[stripe] = pointers[stripe + 1];
1927 pointers[rbio->nr_data - 1] = p;
1928
1929
1930 run_xor(pointers, rbio->nr_data - 1, PAGE_SIZE);
1931 }
1932
1933
1934
1935
1936
1937
1938 if (rbio->operation == BTRFS_RBIO_WRITE) {
1939 for (i = 0; i < rbio->stripe_npages; i++) {
1940 if (faila != -1) {
1941 page = rbio_stripe_page(rbio, faila, i);
1942 SetPageUptodate(page);
1943 }
1944 if (failb != -1) {
1945 page = rbio_stripe_page(rbio, failb, i);
1946 SetPageUptodate(page);
1947 }
1948 }
1949 }
1950 for (stripe = 0; stripe < rbio->real_stripes; stripe++) {
1951
1952
1953
1954
1955 if ((rbio->operation == BTRFS_RBIO_READ_REBUILD ||
1956 rbio->operation == BTRFS_RBIO_REBUILD_MISSING) &&
1957 (stripe == faila || stripe == failb)) {
1958 page = page_in_rbio(rbio, stripe, pagenr, 0);
1959 } else {
1960 page = rbio_stripe_page(rbio, stripe, pagenr);
1961 }
1962 kunmap(page);
1963 }
1964 }
1965
1966 err = BLK_STS_OK;
1967cleanup:
1968 kfree(pointers);
1969
1970cleanup_io:
1971
1972
1973
1974
1975
1976 if (rbio->operation == BTRFS_RBIO_READ_REBUILD ||
1977 rbio->operation == BTRFS_RBIO_REBUILD_MISSING) {
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993 if (err == BLK_STS_OK && rbio->failb < 0)
1994 cache_rbio_pages(rbio);
1995 else
1996 clear_bit(RBIO_CACHE_READY_BIT, &rbio->flags);
1997
1998 rbio_orig_end_io(rbio, err);
1999 } else if (err == BLK_STS_OK) {
2000 rbio->faila = -1;
2001 rbio->failb = -1;
2002
2003 if (rbio->operation == BTRFS_RBIO_WRITE)
2004 finish_rmw(rbio);
2005 else if (rbio->operation == BTRFS_RBIO_PARITY_SCRUB)
2006 finish_parity_scrub(rbio, 0);
2007 else
2008 BUG();
2009 } else {
2010 rbio_orig_end_io(rbio, err);
2011 }
2012}
2013
2014
2015
2016
2017
2018static void raid_recover_end_io(struct bio *bio)
2019{
2020 struct btrfs_raid_bio *rbio = bio->bi_private;
2021
2022
2023
2024
2025
2026 if (bio->bi_status)
2027 fail_bio_stripe(rbio, bio);
2028 else
2029 set_bio_pages_uptodate(bio);
2030 bio_put(bio);
2031
2032 if (!atomic_dec_and_test(&rbio->stripes_pending))
2033 return;
2034
2035 if (atomic_read(&rbio->error) > rbio->bbio->max_errors)
2036 rbio_orig_end_io(rbio, BLK_STS_IOERR);
2037 else
2038 __raid_recover_end_io(rbio);
2039}
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049static int __raid56_parity_recover(struct btrfs_raid_bio *rbio)
2050{
2051 int bios_to_read = 0;
2052 struct bio_list bio_list;
2053 int ret;
2054 int pagenr;
2055 int stripe;
2056 struct bio *bio;
2057
2058 bio_list_init(&bio_list);
2059
2060 ret = alloc_rbio_pages(rbio);
2061 if (ret)
2062 goto cleanup;
2063
2064 atomic_set(&rbio->error, 0);
2065
2066
2067
2068
2069
2070
2071 for (stripe = 0; stripe < rbio->real_stripes; stripe++) {
2072 if (rbio->faila == stripe || rbio->failb == stripe) {
2073 atomic_inc(&rbio->error);
2074 continue;
2075 }
2076
2077 for (pagenr = 0; pagenr < rbio->stripe_npages; pagenr++) {
2078 struct page *p;
2079
2080
2081
2082
2083
2084 p = rbio_stripe_page(rbio, stripe, pagenr);
2085 if (PageUptodate(p))
2086 continue;
2087
2088 ret = rbio_add_io_page(rbio, &bio_list,
2089 rbio_stripe_page(rbio, stripe, pagenr),
2090 stripe, pagenr, rbio->stripe_len);
2091 if (ret < 0)
2092 goto cleanup;
2093 }
2094 }
2095
2096 bios_to_read = bio_list_size(&bio_list);
2097 if (!bios_to_read) {
2098
2099
2100
2101
2102
2103 if (atomic_read(&rbio->error) <= rbio->bbio->max_errors) {
2104 __raid_recover_end_io(rbio);
2105 goto out;
2106 } else {
2107 goto cleanup;
2108 }
2109 }
2110
2111
2112
2113
2114
2115 atomic_set(&rbio->stripes_pending, bios_to_read);
2116 while (1) {
2117 bio = bio_list_pop(&bio_list);
2118 if (!bio)
2119 break;
2120
2121 bio->bi_private = rbio;
2122 bio->bi_end_io = raid_recover_end_io;
2123 bio->bi_opf = REQ_OP_READ;
2124
2125 btrfs_bio_wq_end_io(rbio->fs_info, bio, BTRFS_WQ_ENDIO_RAID56);
2126
2127 submit_bio(bio);
2128 }
2129out:
2130 return 0;
2131
2132cleanup:
2133 if (rbio->operation == BTRFS_RBIO_READ_REBUILD ||
2134 rbio->operation == BTRFS_RBIO_REBUILD_MISSING)
2135 rbio_orig_end_io(rbio, BLK_STS_IOERR);
2136
2137 while ((bio = bio_list_pop(&bio_list)))
2138 bio_put(bio);
2139
2140 return -EIO;
2141}
2142
2143
2144
2145
2146
2147
2148
2149int raid56_parity_recover(struct btrfs_fs_info *fs_info, struct bio *bio,
2150 struct btrfs_bio *bbio, u64 stripe_len,
2151 int mirror_num, int generic_io)
2152{
2153 struct btrfs_raid_bio *rbio;
2154 int ret;
2155
2156 if (generic_io) {
2157 ASSERT(bbio->mirror_num == mirror_num);
2158 btrfs_io_bio(bio)->mirror_num = mirror_num;
2159 }
2160
2161 rbio = alloc_rbio(fs_info, bbio, stripe_len);
2162 if (IS_ERR(rbio)) {
2163 if (generic_io)
2164 btrfs_put_bbio(bbio);
2165 return PTR_ERR(rbio);
2166 }
2167
2168 rbio->operation = BTRFS_RBIO_READ_REBUILD;
2169 bio_list_add(&rbio->bio_list, bio);
2170 rbio->bio_list_bytes = bio->bi_iter.bi_size;
2171
2172 rbio->faila = find_logical_bio_stripe(rbio, bio);
2173 if (rbio->faila == -1) {
2174 btrfs_warn(fs_info,
2175 "%s could not find the bad stripe in raid56 so that we cannot recover any more (bio has logical %llu len %llu, bbio has map_type %llu)",
2176 __func__, (u64)bio->bi_iter.bi_sector << 9,
2177 (u64)bio->bi_iter.bi_size, bbio->map_type);
2178 if (generic_io)
2179 btrfs_put_bbio(bbio);
2180 kfree(rbio);
2181 return -EIO;
2182 }
2183
2184 if (generic_io) {
2185 btrfs_bio_counter_inc_noblocked(fs_info);
2186 rbio->generic_bio_cnt = 1;
2187 } else {
2188 btrfs_get_bbio(bbio);
2189 }
2190
2191
2192
2193
2194
2195
2196 if (mirror_num > 2) {
2197
2198
2199
2200
2201
2202 rbio->failb = rbio->real_stripes - (mirror_num - 1);
2203 ASSERT(rbio->failb > 0);
2204 if (rbio->failb <= rbio->faila)
2205 rbio->failb--;
2206 }
2207
2208 ret = lock_stripe_add(rbio);
2209
2210
2211
2212
2213
2214
2215
2216
2217 if (ret == 0)
2218 __raid56_parity_recover(rbio);
2219
2220
2221
2222
2223
2224 return 0;
2225
2226}
2227
2228static void rmw_work(struct btrfs_work *work)
2229{
2230 struct btrfs_raid_bio *rbio;
2231
2232 rbio = container_of(work, struct btrfs_raid_bio, work);
2233 raid56_rmw_stripe(rbio);
2234}
2235
2236static void read_rebuild_work(struct btrfs_work *work)
2237{
2238 struct btrfs_raid_bio *rbio;
2239
2240 rbio = container_of(work, struct btrfs_raid_bio, work);
2241 __raid56_parity_recover(rbio);
2242}
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254struct btrfs_raid_bio *
2255raid56_parity_alloc_scrub_rbio(struct btrfs_fs_info *fs_info, struct bio *bio,
2256 struct btrfs_bio *bbio, u64 stripe_len,
2257 struct btrfs_device *scrub_dev,
2258 unsigned long *dbitmap, int stripe_nsectors)
2259{
2260 struct btrfs_raid_bio *rbio;
2261 int i;
2262
2263 rbio = alloc_rbio(fs_info, bbio, stripe_len);
2264 if (IS_ERR(rbio))
2265 return NULL;
2266 bio_list_add(&rbio->bio_list, bio);
2267
2268
2269
2270
2271 ASSERT(!bio->bi_iter.bi_size);
2272 rbio->operation = BTRFS_RBIO_PARITY_SCRUB;
2273
2274
2275
2276
2277
2278
2279 for (i = rbio->nr_data; i < rbio->real_stripes; i++) {
2280 if (bbio->stripes[i].dev == scrub_dev) {
2281 rbio->scrubp = i;
2282 break;
2283 }
2284 }
2285 ASSERT(i < rbio->real_stripes);
2286
2287
2288 ASSERT(fs_info->sectorsize == PAGE_SIZE);
2289 ASSERT(rbio->stripe_npages == stripe_nsectors);
2290 bitmap_copy(rbio->dbitmap, dbitmap, stripe_nsectors);
2291
2292
2293
2294
2295
2296 rbio->generic_bio_cnt = 1;
2297
2298 return rbio;
2299}
2300
2301
2302void raid56_add_scrub_pages(struct btrfs_raid_bio *rbio, struct page *page,
2303 u64 logical)
2304{
2305 int stripe_offset;
2306 int index;
2307
2308 ASSERT(logical >= rbio->bbio->raid_map[0]);
2309 ASSERT(logical + PAGE_SIZE <= rbio->bbio->raid_map[0] +
2310 rbio->stripe_len * rbio->nr_data);
2311 stripe_offset = (int)(logical - rbio->bbio->raid_map[0]);
2312 index = stripe_offset >> PAGE_SHIFT;
2313 rbio->bio_pages[index] = page;
2314}
2315
2316
2317
2318
2319
2320static int alloc_rbio_essential_pages(struct btrfs_raid_bio *rbio)
2321{
2322 int i;
2323 int bit;
2324 int index;
2325 struct page *page;
2326
2327 for_each_set_bit(bit, rbio->dbitmap, rbio->stripe_npages) {
2328 for (i = 0; i < rbio->real_stripes; i++) {
2329 index = i * rbio->stripe_npages + bit;
2330 if (rbio->stripe_pages[index])
2331 continue;
2332
2333 page = alloc_page(GFP_NOFS | __GFP_HIGHMEM);
2334 if (!page)
2335 return -ENOMEM;
2336 rbio->stripe_pages[index] = page;
2337 }
2338 }
2339 return 0;
2340}
2341
2342static noinline void finish_parity_scrub(struct btrfs_raid_bio *rbio,
2343 int need_check)
2344{
2345 struct btrfs_bio *bbio = rbio->bbio;
2346 void **pointers = rbio->finish_pointers;
2347 unsigned long *pbitmap = rbio->finish_pbitmap;
2348 int nr_data = rbio->nr_data;
2349 int stripe;
2350 int pagenr;
2351 bool has_qstripe;
2352 struct page *p_page = NULL;
2353 struct page *q_page = NULL;
2354 struct bio_list bio_list;
2355 struct bio *bio;
2356 int is_replace = 0;
2357 int ret;
2358
2359 bio_list_init(&bio_list);
2360
2361 if (rbio->real_stripes - rbio->nr_data == 1)
2362 has_qstripe = false;
2363 else if (rbio->real_stripes - rbio->nr_data == 2)
2364 has_qstripe = true;
2365 else
2366 BUG();
2367
2368 if (bbio->num_tgtdevs && bbio->tgtdev_map[rbio->scrubp]) {
2369 is_replace = 1;
2370 bitmap_copy(pbitmap, rbio->dbitmap, rbio->stripe_npages);
2371 }
2372
2373
2374
2375
2376
2377
2378 clear_bit(RBIO_CACHE_READY_BIT, &rbio->flags);
2379
2380 if (!need_check)
2381 goto writeback;
2382
2383 p_page = alloc_page(GFP_NOFS | __GFP_HIGHMEM);
2384 if (!p_page)
2385 goto cleanup;
2386 SetPageUptodate(p_page);
2387
2388 if (has_qstripe) {
2389 q_page = alloc_page(GFP_NOFS | __GFP_HIGHMEM);
2390 if (!q_page) {
2391 __free_page(p_page);
2392 goto cleanup;
2393 }
2394 SetPageUptodate(q_page);
2395 }
2396
2397 atomic_set(&rbio->error, 0);
2398
2399 for_each_set_bit(pagenr, rbio->dbitmap, rbio->stripe_npages) {
2400 struct page *p;
2401 void *parity;
2402
2403 for (stripe = 0; stripe < nr_data; stripe++) {
2404 p = page_in_rbio(rbio, stripe, pagenr, 0);
2405 pointers[stripe] = kmap(p);
2406 }
2407
2408
2409 pointers[stripe++] = kmap(p_page);
2410
2411 if (has_qstripe) {
2412
2413
2414
2415
2416 pointers[stripe++] = kmap(q_page);
2417
2418 raid6_call.gen_syndrome(rbio->real_stripes, PAGE_SIZE,
2419 pointers);
2420 } else {
2421
2422 copy_page(pointers[nr_data], pointers[0]);
2423 run_xor(pointers + 1, nr_data - 1, PAGE_SIZE);
2424 }
2425
2426
2427 p = rbio_stripe_page(rbio, rbio->scrubp, pagenr);
2428 parity = kmap(p);
2429 if (memcmp(parity, pointers[rbio->scrubp], PAGE_SIZE))
2430 copy_page(parity, pointers[rbio->scrubp]);
2431 else
2432
2433 bitmap_clear(rbio->dbitmap, pagenr, 1);
2434 kunmap(p);
2435
2436 for (stripe = 0; stripe < nr_data; stripe++)
2437 kunmap(page_in_rbio(rbio, stripe, pagenr, 0));
2438 kunmap(p_page);
2439 }
2440
2441 __free_page(p_page);
2442 if (q_page)
2443 __free_page(q_page);
2444
2445writeback:
2446
2447
2448
2449
2450
2451 for_each_set_bit(pagenr, rbio->dbitmap, rbio->stripe_npages) {
2452 struct page *page;
2453
2454 page = rbio_stripe_page(rbio, rbio->scrubp, pagenr);
2455 ret = rbio_add_io_page(rbio, &bio_list,
2456 page, rbio->scrubp, pagenr, rbio->stripe_len);
2457 if (ret)
2458 goto cleanup;
2459 }
2460
2461 if (!is_replace)
2462 goto submit_write;
2463
2464 for_each_set_bit(pagenr, pbitmap, rbio->stripe_npages) {
2465 struct page *page;
2466
2467 page = rbio_stripe_page(rbio, rbio->scrubp, pagenr);
2468 ret = rbio_add_io_page(rbio, &bio_list, page,
2469 bbio->tgtdev_map[rbio->scrubp],
2470 pagenr, rbio->stripe_len);
2471 if (ret)
2472 goto cleanup;
2473 }
2474
2475submit_write:
2476 nr_data = bio_list_size(&bio_list);
2477 if (!nr_data) {
2478
2479 rbio_orig_end_io(rbio, BLK_STS_OK);
2480 return;
2481 }
2482
2483 atomic_set(&rbio->stripes_pending, nr_data);
2484
2485 while (1) {
2486 bio = bio_list_pop(&bio_list);
2487 if (!bio)
2488 break;
2489
2490 bio->bi_private = rbio;
2491 bio->bi_end_io = raid_write_end_io;
2492 bio->bi_opf = REQ_OP_WRITE;
2493
2494 submit_bio(bio);
2495 }
2496 return;
2497
2498cleanup:
2499 rbio_orig_end_io(rbio, BLK_STS_IOERR);
2500
2501 while ((bio = bio_list_pop(&bio_list)))
2502 bio_put(bio);
2503}
2504
2505static inline int is_data_stripe(struct btrfs_raid_bio *rbio, int stripe)
2506{
2507 if (stripe >= 0 && stripe < rbio->nr_data)
2508 return 1;
2509 return 0;
2510}
2511
2512
2513
2514
2515
2516
2517
2518
2519static void validate_rbio_for_parity_scrub(struct btrfs_raid_bio *rbio)
2520{
2521 if (atomic_read(&rbio->error) > rbio->bbio->max_errors)
2522 goto cleanup;
2523
2524 if (rbio->faila >= 0 || rbio->failb >= 0) {
2525 int dfail = 0, failp = -1;
2526
2527 if (is_data_stripe(rbio, rbio->faila))
2528 dfail++;
2529 else if (is_parity_stripe(rbio->faila))
2530 failp = rbio->faila;
2531
2532 if (is_data_stripe(rbio, rbio->failb))
2533 dfail++;
2534 else if (is_parity_stripe(rbio->failb))
2535 failp = rbio->failb;
2536
2537
2538
2539
2540
2541
2542 if (dfail > rbio->bbio->max_errors - 1)
2543 goto cleanup;
2544
2545
2546
2547
2548
2549 if (dfail == 0) {
2550 finish_parity_scrub(rbio, 0);
2551 return;
2552 }
2553
2554
2555
2556
2557
2558
2559
2560 if (failp != rbio->scrubp)
2561 goto cleanup;
2562
2563 __raid_recover_end_io(rbio);
2564 } else {
2565 finish_parity_scrub(rbio, 1);
2566 }
2567 return;
2568
2569cleanup:
2570 rbio_orig_end_io(rbio, BLK_STS_IOERR);
2571}
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581static void raid56_parity_scrub_end_io(struct bio *bio)
2582{
2583 struct btrfs_raid_bio *rbio = bio->bi_private;
2584
2585 if (bio->bi_status)
2586 fail_bio_stripe(rbio, bio);
2587 else
2588 set_bio_pages_uptodate(bio);
2589
2590 bio_put(bio);
2591
2592 if (!atomic_dec_and_test(&rbio->stripes_pending))
2593 return;
2594
2595
2596
2597
2598
2599
2600 validate_rbio_for_parity_scrub(rbio);
2601}
2602
2603static void raid56_parity_scrub_stripe(struct btrfs_raid_bio *rbio)
2604{
2605 int bios_to_read = 0;
2606 struct bio_list bio_list;
2607 int ret;
2608 int pagenr;
2609 int stripe;
2610 struct bio *bio;
2611
2612 bio_list_init(&bio_list);
2613
2614 ret = alloc_rbio_essential_pages(rbio);
2615 if (ret)
2616 goto cleanup;
2617
2618 atomic_set(&rbio->error, 0);
2619
2620
2621
2622
2623 for (stripe = 0; stripe < rbio->real_stripes; stripe++) {
2624 for_each_set_bit(pagenr, rbio->dbitmap, rbio->stripe_npages) {
2625 struct page *page;
2626
2627
2628
2629
2630
2631
2632 page = page_in_rbio(rbio, stripe, pagenr, 1);
2633 if (page)
2634 continue;
2635
2636 page = rbio_stripe_page(rbio, stripe, pagenr);
2637
2638
2639
2640
2641 if (PageUptodate(page))
2642 continue;
2643
2644 ret = rbio_add_io_page(rbio, &bio_list, page,
2645 stripe, pagenr, rbio->stripe_len);
2646 if (ret)
2647 goto cleanup;
2648 }
2649 }
2650
2651 bios_to_read = bio_list_size(&bio_list);
2652 if (!bios_to_read) {
2653
2654
2655
2656
2657
2658
2659 goto finish;
2660 }
2661
2662
2663
2664
2665
2666 atomic_set(&rbio->stripes_pending, bios_to_read);
2667 while (1) {
2668 bio = bio_list_pop(&bio_list);
2669 if (!bio)
2670 break;
2671
2672 bio->bi_private = rbio;
2673 bio->bi_end_io = raid56_parity_scrub_end_io;
2674 bio->bi_opf = REQ_OP_READ;
2675
2676 btrfs_bio_wq_end_io(rbio->fs_info, bio, BTRFS_WQ_ENDIO_RAID56);
2677
2678 submit_bio(bio);
2679 }
2680
2681 return;
2682
2683cleanup:
2684 rbio_orig_end_io(rbio, BLK_STS_IOERR);
2685
2686 while ((bio = bio_list_pop(&bio_list)))
2687 bio_put(bio);
2688
2689 return;
2690
2691finish:
2692 validate_rbio_for_parity_scrub(rbio);
2693}
2694
2695static void scrub_parity_work(struct btrfs_work *work)
2696{
2697 struct btrfs_raid_bio *rbio;
2698
2699 rbio = container_of(work, struct btrfs_raid_bio, work);
2700 raid56_parity_scrub_stripe(rbio);
2701}
2702
2703void raid56_parity_submit_scrub_rbio(struct btrfs_raid_bio *rbio)
2704{
2705 if (!lock_stripe_add(rbio))
2706 start_async_work(rbio, scrub_parity_work);
2707}
2708
2709
2710
2711struct btrfs_raid_bio *
2712raid56_alloc_missing_rbio(struct btrfs_fs_info *fs_info, struct bio *bio,
2713 struct btrfs_bio *bbio, u64 length)
2714{
2715 struct btrfs_raid_bio *rbio;
2716
2717 rbio = alloc_rbio(fs_info, bbio, length);
2718 if (IS_ERR(rbio))
2719 return NULL;
2720
2721 rbio->operation = BTRFS_RBIO_REBUILD_MISSING;
2722 bio_list_add(&rbio->bio_list, bio);
2723
2724
2725
2726
2727 ASSERT(!bio->bi_iter.bi_size);
2728
2729 rbio->faila = find_logical_bio_stripe(rbio, bio);
2730 if (rbio->faila == -1) {
2731 BUG();
2732 kfree(rbio);
2733 return NULL;
2734 }
2735
2736
2737
2738
2739
2740 rbio->generic_bio_cnt = 1;
2741
2742 return rbio;
2743}
2744
2745void raid56_submit_missing_rbio(struct btrfs_raid_bio *rbio)
2746{
2747 if (!lock_stripe_add(rbio))
2748 start_async_work(rbio, read_rebuild_work);
2749}
2750