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34#include <linux/slab.h>
35#include <linux/delay.h>
36#include <linux/blkdev.h>
37#include <linux/seq_file.h>
38#include "md.h"
39#include "raid1.h"
40#include "bitmap.h"
41
42#define DEBUG 0
43#if DEBUG
44#define PRINTK(x...) printk(x)
45#else
46#define PRINTK(x...)
47#endif
48
49
50
51
52#define NR_RAID1_BIOS 256
53
54
55static void unplug_slaves(mddev_t *mddev);
56
57static void allow_barrier(conf_t *conf);
58static void lower_barrier(conf_t *conf);
59
60static void * r1bio_pool_alloc(gfp_t gfp_flags, void *data)
61{
62 struct pool_info *pi = data;
63 r1bio_t *r1_bio;
64 int size = offsetof(r1bio_t, bios[pi->raid_disks]);
65
66
67 r1_bio = kzalloc(size, gfp_flags);
68 if (!r1_bio && pi->mddev)
69 unplug_slaves(pi->mddev);
70
71 return r1_bio;
72}
73
74static void r1bio_pool_free(void *r1_bio, void *data)
75{
76 kfree(r1_bio);
77}
78
79#define RESYNC_BLOCK_SIZE (64*1024)
80
81#define RESYNC_SECTORS (RESYNC_BLOCK_SIZE >> 9)
82#define RESYNC_PAGES ((RESYNC_BLOCK_SIZE + PAGE_SIZE-1) / PAGE_SIZE)
83#define RESYNC_WINDOW (2048*1024)
84
85static void * r1buf_pool_alloc(gfp_t gfp_flags, void *data)
86{
87 struct pool_info *pi = data;
88 struct page *page;
89 r1bio_t *r1_bio;
90 struct bio *bio;
91 int i, j;
92
93 r1_bio = r1bio_pool_alloc(gfp_flags, pi);
94 if (!r1_bio) {
95 unplug_slaves(pi->mddev);
96 return NULL;
97 }
98
99
100
101
102 for (j = pi->raid_disks ; j-- ; ) {
103 bio = bio_kmalloc(gfp_flags, RESYNC_PAGES);
104 if (!bio)
105 goto out_free_bio;
106 r1_bio->bios[j] = bio;
107 }
108
109
110
111
112
113
114 if (test_bit(MD_RECOVERY_REQUESTED, &pi->mddev->recovery))
115 j = pi->raid_disks;
116 else
117 j = 1;
118 while(j--) {
119 bio = r1_bio->bios[j];
120 for (i = 0; i < RESYNC_PAGES; i++) {
121 page = alloc_page(gfp_flags);
122 if (unlikely(!page))
123 goto out_free_pages;
124
125 bio->bi_io_vec[i].bv_page = page;
126 bio->bi_vcnt = i+1;
127 }
128 }
129
130 if (!test_bit(MD_RECOVERY_REQUESTED, &pi->mddev->recovery)) {
131 for (i=0; i<RESYNC_PAGES ; i++)
132 for (j=1; j<pi->raid_disks; j++)
133 r1_bio->bios[j]->bi_io_vec[i].bv_page =
134 r1_bio->bios[0]->bi_io_vec[i].bv_page;
135 }
136
137 r1_bio->master_bio = NULL;
138
139 return r1_bio;
140
141out_free_pages:
142 for (j=0 ; j < pi->raid_disks; j++)
143 for (i=0; i < r1_bio->bios[j]->bi_vcnt ; i++)
144 put_page(r1_bio->bios[j]->bi_io_vec[i].bv_page);
145 j = -1;
146out_free_bio:
147 while ( ++j < pi->raid_disks )
148 bio_put(r1_bio->bios[j]);
149 r1bio_pool_free(r1_bio, data);
150 return NULL;
151}
152
153static void r1buf_pool_free(void *__r1_bio, void *data)
154{
155 struct pool_info *pi = data;
156 int i,j;
157 r1bio_t *r1bio = __r1_bio;
158
159 for (i = 0; i < RESYNC_PAGES; i++)
160 for (j = pi->raid_disks; j-- ;) {
161 if (j == 0 ||
162 r1bio->bios[j]->bi_io_vec[i].bv_page !=
163 r1bio->bios[0]->bi_io_vec[i].bv_page)
164 safe_put_page(r1bio->bios[j]->bi_io_vec[i].bv_page);
165 }
166 for (i=0 ; i < pi->raid_disks; i++)
167 bio_put(r1bio->bios[i]);
168
169 r1bio_pool_free(r1bio, data);
170}
171
172static void put_all_bios(conf_t *conf, r1bio_t *r1_bio)
173{
174 int i;
175
176 for (i = 0; i < conf->raid_disks; i++) {
177 struct bio **bio = r1_bio->bios + i;
178 if (*bio && *bio != IO_BLOCKED)
179 bio_put(*bio);
180 *bio = NULL;
181 }
182}
183
184static void free_r1bio(r1bio_t *r1_bio)
185{
186 conf_t *conf = r1_bio->mddev->private;
187
188
189
190
191
192 allow_barrier(conf);
193
194 put_all_bios(conf, r1_bio);
195 mempool_free(r1_bio, conf->r1bio_pool);
196}
197
198static void put_buf(r1bio_t *r1_bio)
199{
200 conf_t *conf = r1_bio->mddev->private;
201 int i;
202
203 for (i=0; i<conf->raid_disks; i++) {
204 struct bio *bio = r1_bio->bios[i];
205 if (bio->bi_end_io)
206 rdev_dec_pending(conf->mirrors[i].rdev, r1_bio->mddev);
207 }
208
209 mempool_free(r1_bio, conf->r1buf_pool);
210
211 lower_barrier(conf);
212}
213
214static void reschedule_retry(r1bio_t *r1_bio)
215{
216 unsigned long flags;
217 mddev_t *mddev = r1_bio->mddev;
218 conf_t *conf = mddev->private;
219
220 spin_lock_irqsave(&conf->device_lock, flags);
221 list_add(&r1_bio->retry_list, &conf->retry_list);
222 conf->nr_queued ++;
223 spin_unlock_irqrestore(&conf->device_lock, flags);
224
225 wake_up(&conf->wait_barrier);
226 md_wakeup_thread(mddev->thread);
227}
228
229
230
231
232
233
234static void raid_end_bio_io(r1bio_t *r1_bio)
235{
236 struct bio *bio = r1_bio->master_bio;
237
238
239 if (!test_and_set_bit(R1BIO_Returned, &r1_bio->state)) {
240 PRINTK(KERN_DEBUG "raid1: sync end %s on sectors %llu-%llu\n",
241 (bio_data_dir(bio) == WRITE) ? "write" : "read",
242 (unsigned long long) bio->bi_sector,
243 (unsigned long long) bio->bi_sector +
244 (bio->bi_size >> 9) - 1);
245
246 bio_endio(bio,
247 test_bit(R1BIO_Uptodate, &r1_bio->state) ? 0 : -EIO);
248 }
249 free_r1bio(r1_bio);
250}
251
252
253
254
255static inline void update_head_pos(int disk, r1bio_t *r1_bio)
256{
257 conf_t *conf = r1_bio->mddev->private;
258
259 conf->mirrors[disk].head_position =
260 r1_bio->sector + (r1_bio->sectors);
261}
262
263static void raid1_end_read_request(struct bio *bio, int error)
264{
265 int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
266 r1bio_t *r1_bio = bio->bi_private;
267 int mirror;
268 conf_t *conf = r1_bio->mddev->private;
269
270 mirror = r1_bio->read_disk;
271
272
273
274 update_head_pos(mirror, r1_bio);
275
276 if (uptodate)
277 set_bit(R1BIO_Uptodate, &r1_bio->state);
278 else {
279
280
281
282
283 unsigned long flags;
284 spin_lock_irqsave(&conf->device_lock, flags);
285 if (r1_bio->mddev->degraded == conf->raid_disks ||
286 (r1_bio->mddev->degraded == conf->raid_disks-1 &&
287 !test_bit(Faulty, &conf->mirrors[mirror].rdev->flags)))
288 uptodate = 1;
289 spin_unlock_irqrestore(&conf->device_lock, flags);
290 }
291
292 if (uptodate)
293 raid_end_bio_io(r1_bio);
294 else {
295
296
297
298 char b[BDEVNAME_SIZE];
299 if (printk_ratelimit())
300 printk(KERN_ERR "md/raid1:%s: %s: rescheduling sector %llu\n",
301 mdname(conf->mddev),
302 bdevname(conf->mirrors[mirror].rdev->bdev,b), (unsigned long long)r1_bio->sector);
303 reschedule_retry(r1_bio);
304 }
305
306 rdev_dec_pending(conf->mirrors[mirror].rdev, conf->mddev);
307}
308
309static void r1_bio_write_done(r1bio_t *r1_bio, int vcnt, struct bio_vec *bv,
310 int behind)
311{
312 if (atomic_dec_and_test(&r1_bio->remaining))
313 {
314
315 if (test_bit(R1BIO_BehindIO, &r1_bio->state)) {
316
317 int i = vcnt;
318 while (i--)
319 safe_put_page(bv[i].bv_page);
320 }
321
322 bitmap_endwrite(r1_bio->mddev->bitmap, r1_bio->sector,
323 r1_bio->sectors,
324 !test_bit(R1BIO_Degraded, &r1_bio->state),
325 behind);
326 md_write_end(r1_bio->mddev);
327 raid_end_bio_io(r1_bio);
328 }
329}
330
331static void raid1_end_write_request(struct bio *bio, int error)
332{
333 int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
334 r1bio_t *r1_bio = bio->bi_private;
335 int mirror, behind = test_bit(R1BIO_BehindIO, &r1_bio->state);
336 conf_t *conf = r1_bio->mddev->private;
337 struct bio *to_put = NULL;
338
339
340 for (mirror = 0; mirror < conf->raid_disks; mirror++)
341 if (r1_bio->bios[mirror] == bio)
342 break;
343
344
345
346
347 r1_bio->bios[mirror] = NULL;
348 to_put = bio;
349 if (!uptodate) {
350 md_error(r1_bio->mddev, conf->mirrors[mirror].rdev);
351
352 set_bit(R1BIO_Degraded, &r1_bio->state);
353 } else
354
355
356
357
358
359
360
361
362
363
364 set_bit(R1BIO_Uptodate, &r1_bio->state);
365
366 update_head_pos(mirror, r1_bio);
367
368 if (behind) {
369 if (test_bit(WriteMostly, &conf->mirrors[mirror].rdev->flags))
370 atomic_dec(&r1_bio->behind_remaining);
371
372
373
374
375
376
377
378
379 if (atomic_read(&r1_bio->behind_remaining) >= (atomic_read(&r1_bio->remaining)-1) &&
380 test_bit(R1BIO_Uptodate, &r1_bio->state)) {
381
382 if (!test_and_set_bit(R1BIO_Returned, &r1_bio->state)) {
383 struct bio *mbio = r1_bio->master_bio;
384 PRINTK(KERN_DEBUG "raid1: behind end write sectors %llu-%llu\n",
385 (unsigned long long) mbio->bi_sector,
386 (unsigned long long) mbio->bi_sector +
387 (mbio->bi_size >> 9) - 1);
388 bio_endio(mbio, 0);
389 }
390 }
391 }
392 rdev_dec_pending(conf->mirrors[mirror].rdev, conf->mddev);
393
394
395
396
397
398 r1_bio_write_done(r1_bio, bio->bi_vcnt, bio->bi_io_vec, behind);
399
400 if (to_put)
401 bio_put(to_put);
402}
403
404
405
406
407
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409
410
411
412
413
414
415
416
417
418
419static int read_balance(conf_t *conf, r1bio_t *r1_bio)
420{
421 const sector_t this_sector = r1_bio->sector;
422 const int sectors = r1_bio->sectors;
423 int new_disk = -1;
424 int start_disk;
425 int i;
426 sector_t new_distance, current_distance;
427 mdk_rdev_t *rdev;
428 int choose_first;
429
430 rcu_read_lock();
431
432
433
434
435
436 retry:
437 if (conf->mddev->recovery_cp < MaxSector &&
438 (this_sector + sectors >= conf->next_resync)) {
439 choose_first = 1;
440 start_disk = 0;
441 } else {
442 choose_first = 0;
443 start_disk = conf->last_used;
444 }
445
446
447 for (i = 0 ; i < conf->raid_disks ; i++) {
448 int disk = start_disk + i;
449 if (disk >= conf->raid_disks)
450 disk -= conf->raid_disks;
451
452 rdev = rcu_dereference(conf->mirrors[disk].rdev);
453 if (r1_bio->bios[disk] == IO_BLOCKED
454 || rdev == NULL
455 || !test_bit(In_sync, &rdev->flags))
456 continue;
457
458 new_disk = disk;
459 if (!test_bit(WriteMostly, &rdev->flags))
460 break;
461 }
462
463 if (new_disk < 0 || choose_first)
464 goto rb_out;
465
466
467
468
469 if (conf->next_seq_sect == this_sector)
470 goto rb_out;
471 if (this_sector == conf->mirrors[new_disk].head_position)
472 goto rb_out;
473
474 current_distance = abs(this_sector
475 - conf->mirrors[new_disk].head_position);
476
477
478 start_disk = new_disk;
479 for (i = 1; i < conf->raid_disks; i++) {
480 int disk = start_disk + 1;
481 if (disk >= conf->raid_disks)
482 disk -= conf->raid_disks;
483
484 rdev = rcu_dereference(conf->mirrors[disk].rdev);
485 if (r1_bio->bios[disk] == IO_BLOCKED
486 || rdev == NULL
487 || !test_bit(In_sync, &rdev->flags)
488 || test_bit(WriteMostly, &rdev->flags))
489 continue;
490
491 if (!atomic_read(&rdev->nr_pending)) {
492 new_disk = disk;
493 break;
494 }
495 new_distance = abs(this_sector - conf->mirrors[disk].head_position);
496 if (new_distance < current_distance) {
497 current_distance = new_distance;
498 new_disk = disk;
499 }
500 }
501
502 rb_out:
503 if (new_disk >= 0) {
504 rdev = rcu_dereference(conf->mirrors[new_disk].rdev);
505 if (!rdev)
506 goto retry;
507 atomic_inc(&rdev->nr_pending);
508 if (!test_bit(In_sync, &rdev->flags)) {
509
510
511
512 rdev_dec_pending(rdev, conf->mddev);
513 goto retry;
514 }
515 conf->next_seq_sect = this_sector + sectors;
516 conf->last_used = new_disk;
517 }
518 rcu_read_unlock();
519
520 return new_disk;
521}
522
523static void unplug_slaves(mddev_t *mddev)
524{
525 conf_t *conf = mddev->private;
526 int i;
527
528 rcu_read_lock();
529 for (i=0; i<mddev->raid_disks; i++) {
530 mdk_rdev_t *rdev = rcu_dereference(conf->mirrors[i].rdev);
531 if (rdev && !test_bit(Faulty, &rdev->flags) && atomic_read(&rdev->nr_pending)) {
532 struct request_queue *r_queue = bdev_get_queue(rdev->bdev);
533
534 atomic_inc(&rdev->nr_pending);
535 rcu_read_unlock();
536
537 blk_unplug(r_queue);
538
539 rdev_dec_pending(rdev, mddev);
540 rcu_read_lock();
541 }
542 }
543 rcu_read_unlock();
544}
545
546static void raid1_unplug(struct request_queue *q)
547{
548 mddev_t *mddev = q->queuedata;
549
550 unplug_slaves(mddev);
551 md_wakeup_thread(mddev->thread);
552}
553
554static int raid1_congested(void *data, int bits)
555{
556 mddev_t *mddev = data;
557 conf_t *conf = mddev->private;
558 int i, ret = 0;
559
560 if (mddev_congested(mddev, bits))
561 return 1;
562
563 rcu_read_lock();
564 for (i = 0; i < mddev->raid_disks; i++) {
565 mdk_rdev_t *rdev = rcu_dereference(conf->mirrors[i].rdev);
566 if (rdev && !test_bit(Faulty, &rdev->flags)) {
567 struct request_queue *q = bdev_get_queue(rdev->bdev);
568
569
570
571
572 if ((bits & (1<<BDI_async_congested)) || 1)
573 ret |= bdi_congested(&q->backing_dev_info, bits);
574 else
575 ret &= bdi_congested(&q->backing_dev_info, bits);
576 }
577 }
578 rcu_read_unlock();
579 return ret;
580}
581
582
583static int flush_pending_writes(conf_t *conf)
584{
585
586
587
588
589 int rv = 0;
590
591 spin_lock_irq(&conf->device_lock);
592
593 if (conf->pending_bio_list.head) {
594 struct bio *bio;
595 bio = bio_list_get(&conf->pending_bio_list);
596
597 spin_lock(conf->mddev->queue->queue_lock);
598 blk_remove_plug(conf->mddev->queue);
599 spin_unlock(conf->mddev->queue->queue_lock);
600 spin_unlock_irq(&conf->device_lock);
601
602
603 bitmap_unplug(conf->mddev->bitmap);
604
605 while (bio) {
606 struct bio *next = bio->bi_next;
607 bio->bi_next = NULL;
608 generic_make_request(bio);
609 bio = next;
610 }
611 rv = 1;
612 } else
613 spin_unlock_irq(&conf->device_lock);
614 return rv;
615}
616
617
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619
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622
623
624
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626
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629
630
631
632
633
634
635
636
637
638#define RESYNC_DEPTH 32
639
640static void raise_barrier(conf_t *conf)
641{
642 spin_lock_irq(&conf->resync_lock);
643
644
645 wait_event_lock_irq(conf->wait_barrier, !conf->nr_waiting,
646 conf->resync_lock,
647 raid1_unplug(conf->mddev->queue));
648
649
650 conf->barrier++;
651
652
653 wait_event_lock_irq(conf->wait_barrier,
654 !conf->nr_pending && conf->barrier < RESYNC_DEPTH,
655 conf->resync_lock,
656 raid1_unplug(conf->mddev->queue));
657
658 spin_unlock_irq(&conf->resync_lock);
659}
660
661static void lower_barrier(conf_t *conf)
662{
663 unsigned long flags;
664 BUG_ON(conf->barrier <= 0);
665 spin_lock_irqsave(&conf->resync_lock, flags);
666 conf->barrier--;
667 spin_unlock_irqrestore(&conf->resync_lock, flags);
668 wake_up(&conf->wait_barrier);
669}
670
671static void wait_barrier(conf_t *conf)
672{
673 spin_lock_irq(&conf->resync_lock);
674 if (conf->barrier) {
675 conf->nr_waiting++;
676 wait_event_lock_irq(conf->wait_barrier, !conf->barrier,
677 conf->resync_lock,
678 raid1_unplug(conf->mddev->queue));
679 conf->nr_waiting--;
680 }
681 conf->nr_pending++;
682 spin_unlock_irq(&conf->resync_lock);
683}
684
685static void allow_barrier(conf_t *conf)
686{
687 unsigned long flags;
688 spin_lock_irqsave(&conf->resync_lock, flags);
689 conf->nr_pending--;
690 spin_unlock_irqrestore(&conf->resync_lock, flags);
691 wake_up(&conf->wait_barrier);
692}
693
694static void freeze_array(conf_t *conf)
695{
696
697
698
699
700
701
702
703
704
705
706
707
708 spin_lock_irq(&conf->resync_lock);
709 conf->barrier++;
710 conf->nr_waiting++;
711 wait_event_lock_irq(conf->wait_barrier,
712 conf->nr_pending == conf->nr_queued+1,
713 conf->resync_lock,
714 ({ flush_pending_writes(conf);
715 raid1_unplug(conf->mddev->queue); }));
716 spin_unlock_irq(&conf->resync_lock);
717}
718static void unfreeze_array(conf_t *conf)
719{
720
721 spin_lock_irq(&conf->resync_lock);
722 conf->barrier--;
723 conf->nr_waiting--;
724 wake_up(&conf->wait_barrier);
725 spin_unlock_irq(&conf->resync_lock);
726}
727
728
729
730
731
732
733static struct bio_vec *alloc_behind_pages(struct bio *bio)
734{
735 int i;
736 struct bio_vec *bvec;
737 struct bio_vec *pages = kzalloc(bio->bi_vcnt * sizeof(struct bio_vec),
738 GFP_NOIO);
739 if (unlikely(!pages))
740 goto do_sync_io;
741
742 bio_for_each_segment(bvec, bio, i) {
743 pages[i].bv_page = alloc_page(GFP_NOIO);
744 if (unlikely(!pages[i].bv_page))
745 goto do_sync_io;
746 memcpy(kmap(pages[i].bv_page) + bvec->bv_offset,
747 kmap(bvec->bv_page) + bvec->bv_offset, bvec->bv_len);
748 kunmap(pages[i].bv_page);
749 kunmap(bvec->bv_page);
750 }
751
752 return pages;
753
754do_sync_io:
755 if (pages)
756 for (i = 0; i < bio->bi_vcnt && pages[i].bv_page; i++)
757 put_page(pages[i].bv_page);
758 kfree(pages);
759 PRINTK("%dB behind alloc failed, doing sync I/O\n", bio->bi_size);
760 return NULL;
761}
762
763static int make_request(mddev_t *mddev, struct bio * bio)
764{
765 conf_t *conf = mddev->private;
766 mirror_info_t *mirror;
767 r1bio_t *r1_bio;
768 struct bio *read_bio;
769 int i, targets = 0, disks;
770 struct bitmap *bitmap;
771 unsigned long flags;
772 struct bio_vec *behind_pages = NULL;
773 const int rw = bio_data_dir(bio);
774 const unsigned long do_sync = (bio->bi_rw & REQ_SYNC);
775 const unsigned long do_flush_fua = (bio->bi_rw & (REQ_FLUSH | REQ_FUA));
776 mdk_rdev_t *blocked_rdev;
777
778
779
780
781
782
783
784 md_write_start(mddev, bio);
785
786 if (bio_data_dir(bio) == WRITE &&
787 bio->bi_sector + bio->bi_size/512 > mddev->suspend_lo &&
788 bio->bi_sector < mddev->suspend_hi) {
789
790
791
792
793 DEFINE_WAIT(w);
794 for (;;) {
795 flush_signals(current);
796 prepare_to_wait(&conf->wait_barrier,
797 &w, TASK_INTERRUPTIBLE);
798 if (bio->bi_sector + bio->bi_size/512 <= mddev->suspend_lo ||
799 bio->bi_sector >= mddev->suspend_hi)
800 break;
801 schedule();
802 }
803 finish_wait(&conf->wait_barrier, &w);
804 }
805
806 wait_barrier(conf);
807
808 bitmap = mddev->bitmap;
809
810
811
812
813
814
815 r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO);
816
817 r1_bio->master_bio = bio;
818 r1_bio->sectors = bio->bi_size >> 9;
819 r1_bio->state = 0;
820 r1_bio->mddev = mddev;
821 r1_bio->sector = bio->bi_sector;
822
823 if (rw == READ) {
824
825
826
827 int rdisk = read_balance(conf, r1_bio);
828
829 if (rdisk < 0) {
830
831 raid_end_bio_io(r1_bio);
832 return 0;
833 }
834 mirror = conf->mirrors + rdisk;
835
836 if (test_bit(WriteMostly, &mirror->rdev->flags) &&
837 bitmap) {
838
839
840
841
842 wait_event(bitmap->behind_wait,
843 atomic_read(&bitmap->behind_writes) == 0);
844 }
845 r1_bio->read_disk = rdisk;
846
847 read_bio = bio_clone_mddev(bio, GFP_NOIO, mddev);
848
849 r1_bio->bios[rdisk] = read_bio;
850
851 read_bio->bi_sector = r1_bio->sector + mirror->rdev->data_offset;
852 read_bio->bi_bdev = mirror->rdev->bdev;
853 read_bio->bi_end_io = raid1_end_read_request;
854 read_bio->bi_rw = READ | do_sync;
855 read_bio->bi_private = r1_bio;
856
857 generic_make_request(read_bio);
858 return 0;
859 }
860
861
862
863
864
865
866
867
868 disks = conf->raid_disks;
869 retry_write:
870 blocked_rdev = NULL;
871 rcu_read_lock();
872 for (i = 0; i < disks; i++) {
873 mdk_rdev_t *rdev = rcu_dereference(conf->mirrors[i].rdev);
874 if (rdev && unlikely(test_bit(Blocked, &rdev->flags))) {
875 atomic_inc(&rdev->nr_pending);
876 blocked_rdev = rdev;
877 break;
878 }
879 if (rdev && !test_bit(Faulty, &rdev->flags)) {
880 atomic_inc(&rdev->nr_pending);
881 if (test_bit(Faulty, &rdev->flags)) {
882 rdev_dec_pending(rdev, mddev);
883 r1_bio->bios[i] = NULL;
884 } else {
885 r1_bio->bios[i] = bio;
886 targets++;
887 }
888 } else
889 r1_bio->bios[i] = NULL;
890 }
891 rcu_read_unlock();
892
893 if (unlikely(blocked_rdev)) {
894
895 int j;
896
897 for (j = 0; j < i; j++)
898 if (r1_bio->bios[j])
899 rdev_dec_pending(conf->mirrors[j].rdev, mddev);
900
901 allow_barrier(conf);
902 md_wait_for_blocked_rdev(blocked_rdev, mddev);
903 wait_barrier(conf);
904 goto retry_write;
905 }
906
907 BUG_ON(targets == 0);
908
909 if (targets < conf->raid_disks) {
910
911
912 set_bit(R1BIO_Degraded, &r1_bio->state);
913 }
914
915
916
917
918
919 if (bitmap &&
920 (atomic_read(&bitmap->behind_writes)
921 < mddev->bitmap_info.max_write_behind) &&
922 !waitqueue_active(&bitmap->behind_wait) &&
923 (behind_pages = alloc_behind_pages(bio)) != NULL)
924 set_bit(R1BIO_BehindIO, &r1_bio->state);
925
926 atomic_set(&r1_bio->remaining, 1);
927 atomic_set(&r1_bio->behind_remaining, 0);
928
929 bitmap_startwrite(bitmap, bio->bi_sector, r1_bio->sectors,
930 test_bit(R1BIO_BehindIO, &r1_bio->state));
931 for (i = 0; i < disks; i++) {
932 struct bio *mbio;
933 if (!r1_bio->bios[i])
934 continue;
935
936 mbio = bio_clone_mddev(bio, GFP_NOIO, mddev);
937 r1_bio->bios[i] = mbio;
938
939 mbio->bi_sector = r1_bio->sector + conf->mirrors[i].rdev->data_offset;
940 mbio->bi_bdev = conf->mirrors[i].rdev->bdev;
941 mbio->bi_end_io = raid1_end_write_request;
942 mbio->bi_rw = WRITE | do_flush_fua | do_sync;
943 mbio->bi_private = r1_bio;
944
945 if (behind_pages) {
946 struct bio_vec *bvec;
947 int j;
948
949
950
951
952
953
954
955
956 __bio_for_each_segment(bvec, mbio, j, 0)
957 bvec->bv_page = behind_pages[j].bv_page;
958 if (test_bit(WriteMostly, &conf->mirrors[i].rdev->flags))
959 atomic_inc(&r1_bio->behind_remaining);
960 }
961
962 atomic_inc(&r1_bio->remaining);
963 spin_lock_irqsave(&conf->device_lock, flags);
964 bio_list_add(&conf->pending_bio_list, mbio);
965 blk_plug_device_unlocked(mddev->queue);
966 spin_unlock_irqrestore(&conf->device_lock, flags);
967 }
968 r1_bio_write_done(r1_bio, bio->bi_vcnt, behind_pages, behind_pages != NULL);
969 kfree(behind_pages);
970
971
972 wake_up(&conf->wait_barrier);
973
974 if (do_sync)
975 md_wakeup_thread(mddev->thread);
976
977 return 0;
978}
979
980static void status(struct seq_file *seq, mddev_t *mddev)
981{
982 conf_t *conf = mddev->private;
983 int i;
984
985 seq_printf(seq, " [%d/%d] [", conf->raid_disks,
986 conf->raid_disks - mddev->degraded);
987 rcu_read_lock();
988 for (i = 0; i < conf->raid_disks; i++) {
989 mdk_rdev_t *rdev = rcu_dereference(conf->mirrors[i].rdev);
990 seq_printf(seq, "%s",
991 rdev && test_bit(In_sync, &rdev->flags) ? "U" : "_");
992 }
993 rcu_read_unlock();
994 seq_printf(seq, "]");
995}
996
997
998static void error(mddev_t *mddev, mdk_rdev_t *rdev)
999{
1000 char b[BDEVNAME_SIZE];
1001 conf_t *conf = mddev->private;
1002
1003
1004
1005
1006
1007
1008
1009 if (test_bit(In_sync, &rdev->flags)
1010 && (conf->raid_disks - mddev->degraded) == 1) {
1011
1012
1013
1014
1015
1016
1017 mddev->recovery_disabled = 1;
1018 return;
1019 }
1020 if (test_and_clear_bit(In_sync, &rdev->flags)) {
1021 unsigned long flags;
1022 spin_lock_irqsave(&conf->device_lock, flags);
1023 mddev->degraded++;
1024 set_bit(Faulty, &rdev->flags);
1025 spin_unlock_irqrestore(&conf->device_lock, flags);
1026
1027
1028
1029 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
1030 } else
1031 set_bit(Faulty, &rdev->flags);
1032 set_bit(MD_CHANGE_DEVS, &mddev->flags);
1033 printk(KERN_ALERT
1034 "md/raid1:%s: Disk failure on %s, disabling device.\n"
1035 "md/raid1:%s: Operation continuing on %d devices.\n",
1036 mdname(mddev), bdevname(rdev->bdev, b),
1037 mdname(mddev), conf->raid_disks - mddev->degraded);
1038}
1039
1040static void print_conf(conf_t *conf)
1041{
1042 int i;
1043
1044 printk(KERN_DEBUG "RAID1 conf printout:\n");
1045 if (!conf) {
1046 printk(KERN_DEBUG "(!conf)\n");
1047 return;
1048 }
1049 printk(KERN_DEBUG " --- wd:%d rd:%d\n", conf->raid_disks - conf->mddev->degraded,
1050 conf->raid_disks);
1051
1052 rcu_read_lock();
1053 for (i = 0; i < conf->raid_disks; i++) {
1054 char b[BDEVNAME_SIZE];
1055 mdk_rdev_t *rdev = rcu_dereference(conf->mirrors[i].rdev);
1056 if (rdev)
1057 printk(KERN_DEBUG " disk %d, wo:%d, o:%d, dev:%s\n",
1058 i, !test_bit(In_sync, &rdev->flags),
1059 !test_bit(Faulty, &rdev->flags),
1060 bdevname(rdev->bdev,b));
1061 }
1062 rcu_read_unlock();
1063}
1064
1065static void close_sync(conf_t *conf)
1066{
1067 wait_barrier(conf);
1068 allow_barrier(conf);
1069
1070 mempool_destroy(conf->r1buf_pool);
1071 conf->r1buf_pool = NULL;
1072}
1073
1074static int raid1_spare_active(mddev_t *mddev)
1075{
1076 int i;
1077 conf_t *conf = mddev->private;
1078 int count = 0;
1079 unsigned long flags;
1080
1081
1082
1083
1084
1085
1086 for (i = 0; i < conf->raid_disks; i++) {
1087 mdk_rdev_t *rdev = conf->mirrors[i].rdev;
1088 if (rdev
1089 && !test_bit(Faulty, &rdev->flags)
1090 && !test_and_set_bit(In_sync, &rdev->flags)) {
1091 count++;
1092 sysfs_notify_dirent(rdev->sysfs_state);
1093 }
1094 }
1095 spin_lock_irqsave(&conf->device_lock, flags);
1096 mddev->degraded -= count;
1097 spin_unlock_irqrestore(&conf->device_lock, flags);
1098
1099 print_conf(conf);
1100 return count;
1101}
1102
1103
1104static int raid1_add_disk(mddev_t *mddev, mdk_rdev_t *rdev)
1105{
1106 conf_t *conf = mddev->private;
1107 int err = -EEXIST;
1108 int mirror = 0;
1109 mirror_info_t *p;
1110 int first = 0;
1111 int last = mddev->raid_disks - 1;
1112
1113 if (rdev->raid_disk >= 0)
1114 first = last = rdev->raid_disk;
1115
1116 for (mirror = first; mirror <= last; mirror++)
1117 if ( !(p=conf->mirrors+mirror)->rdev) {
1118
1119 disk_stack_limits(mddev->gendisk, rdev->bdev,
1120 rdev->data_offset << 9);
1121
1122
1123
1124
1125
1126
1127 if (rdev->bdev->bd_disk->queue->merge_bvec_fn) {
1128 blk_queue_max_segments(mddev->queue, 1);
1129 blk_queue_segment_boundary(mddev->queue,
1130 PAGE_CACHE_SIZE - 1);
1131 }
1132
1133 p->head_position = 0;
1134 rdev->raid_disk = mirror;
1135 err = 0;
1136
1137
1138
1139 if (rdev->saved_raid_disk < 0)
1140 conf->fullsync = 1;
1141 rcu_assign_pointer(p->rdev, rdev);
1142 break;
1143 }
1144 md_integrity_add_rdev(rdev, mddev);
1145 print_conf(conf);
1146 return err;
1147}
1148
1149static int raid1_remove_disk(mddev_t *mddev, int number)
1150{
1151 conf_t *conf = mddev->private;
1152 int err = 0;
1153 mdk_rdev_t *rdev;
1154 mirror_info_t *p = conf->mirrors+ number;
1155
1156 print_conf(conf);
1157 rdev = p->rdev;
1158 if (rdev) {
1159 if (test_bit(In_sync, &rdev->flags) ||
1160 atomic_read(&rdev->nr_pending)) {
1161 err = -EBUSY;
1162 goto abort;
1163 }
1164
1165
1166
1167 if (!test_bit(Faulty, &rdev->flags) &&
1168 !mddev->recovery_disabled &&
1169 mddev->degraded < conf->raid_disks) {
1170 err = -EBUSY;
1171 goto abort;
1172 }
1173 p->rdev = NULL;
1174 synchronize_rcu();
1175 if (atomic_read(&rdev->nr_pending)) {
1176
1177 err = -EBUSY;
1178 p->rdev = rdev;
1179 goto abort;
1180 }
1181 md_integrity_register(mddev);
1182 }
1183abort:
1184
1185 print_conf(conf);
1186 return err;
1187}
1188
1189
1190static void end_sync_read(struct bio *bio, int error)
1191{
1192 r1bio_t *r1_bio = bio->bi_private;
1193 int i;
1194
1195 for (i=r1_bio->mddev->raid_disks; i--; )
1196 if (r1_bio->bios[i] == bio)
1197 break;
1198 BUG_ON(i < 0);
1199 update_head_pos(i, r1_bio);
1200
1201
1202
1203
1204
1205 if (test_bit(BIO_UPTODATE, &bio->bi_flags))
1206 set_bit(R1BIO_Uptodate, &r1_bio->state);
1207
1208 if (atomic_dec_and_test(&r1_bio->remaining))
1209 reschedule_retry(r1_bio);
1210}
1211
1212static void end_sync_write(struct bio *bio, int error)
1213{
1214 int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
1215 r1bio_t *r1_bio = bio->bi_private;
1216 mddev_t *mddev = r1_bio->mddev;
1217 conf_t *conf = mddev->private;
1218 int i;
1219 int mirror=0;
1220
1221 for (i = 0; i < conf->raid_disks; i++)
1222 if (r1_bio->bios[i] == bio) {
1223 mirror = i;
1224 break;
1225 }
1226 if (!uptodate) {
1227 sector_t sync_blocks = 0;
1228 sector_t s = r1_bio->sector;
1229 long sectors_to_go = r1_bio->sectors;
1230
1231 do {
1232 bitmap_end_sync(mddev->bitmap, s,
1233 &sync_blocks, 1);
1234 s += sync_blocks;
1235 sectors_to_go -= sync_blocks;
1236 } while (sectors_to_go > 0);
1237 md_error(mddev, conf->mirrors[mirror].rdev);
1238 }
1239
1240 update_head_pos(mirror, r1_bio);
1241
1242 if (atomic_dec_and_test(&r1_bio->remaining)) {
1243 sector_t s = r1_bio->sectors;
1244 put_buf(r1_bio);
1245 md_done_sync(mddev, s, uptodate);
1246 }
1247}
1248
1249static void sync_request_write(mddev_t *mddev, r1bio_t *r1_bio)
1250{
1251 conf_t *conf = mddev->private;
1252 int i;
1253 int disks = conf->raid_disks;
1254 struct bio *bio, *wbio;
1255
1256 bio = r1_bio->bios[r1_bio->read_disk];
1257
1258
1259 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
1260
1261
1262
1263
1264
1265
1266
1267 int primary;
1268 if (!test_bit(R1BIO_Uptodate, &r1_bio->state)) {
1269 for (i=0; i<mddev->raid_disks; i++)
1270 if (r1_bio->bios[i]->bi_end_io == end_sync_read)
1271 md_error(mddev, conf->mirrors[i].rdev);
1272
1273 md_done_sync(mddev, r1_bio->sectors, 1);
1274 put_buf(r1_bio);
1275 return;
1276 }
1277 for (primary=0; primary<mddev->raid_disks; primary++)
1278 if (r1_bio->bios[primary]->bi_end_io == end_sync_read &&
1279 test_bit(BIO_UPTODATE, &r1_bio->bios[primary]->bi_flags)) {
1280 r1_bio->bios[primary]->bi_end_io = NULL;
1281 rdev_dec_pending(conf->mirrors[primary].rdev, mddev);
1282 break;
1283 }
1284 r1_bio->read_disk = primary;
1285 for (i=0; i<mddev->raid_disks; i++)
1286 if (r1_bio->bios[i]->bi_end_io == end_sync_read) {
1287 int j;
1288 int vcnt = r1_bio->sectors >> (PAGE_SHIFT- 9);
1289 struct bio *pbio = r1_bio->bios[primary];
1290 struct bio *sbio = r1_bio->bios[i];
1291
1292 if (test_bit(BIO_UPTODATE, &sbio->bi_flags)) {
1293 for (j = vcnt; j-- ; ) {
1294 struct page *p, *s;
1295 p = pbio->bi_io_vec[j].bv_page;
1296 s = sbio->bi_io_vec[j].bv_page;
1297 if (memcmp(page_address(p),
1298 page_address(s),
1299 PAGE_SIZE))
1300 break;
1301 }
1302 } else
1303 j = 0;
1304 if (j >= 0)
1305 mddev->resync_mismatches += r1_bio->sectors;
1306 if (j < 0 || (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)
1307 && test_bit(BIO_UPTODATE, &sbio->bi_flags))) {
1308 sbio->bi_end_io = NULL;
1309 rdev_dec_pending(conf->mirrors[i].rdev, mddev);
1310 } else {
1311
1312 int size;
1313 sbio->bi_vcnt = vcnt;
1314 sbio->bi_size = r1_bio->sectors << 9;
1315 sbio->bi_idx = 0;
1316 sbio->bi_phys_segments = 0;
1317 sbio->bi_flags &= ~(BIO_POOL_MASK - 1);
1318 sbio->bi_flags |= 1 << BIO_UPTODATE;
1319 sbio->bi_next = NULL;
1320 sbio->bi_sector = r1_bio->sector +
1321 conf->mirrors[i].rdev->data_offset;
1322 sbio->bi_bdev = conf->mirrors[i].rdev->bdev;
1323 size = sbio->bi_size;
1324 for (j = 0; j < vcnt ; j++) {
1325 struct bio_vec *bi;
1326 bi = &sbio->bi_io_vec[j];
1327 bi->bv_offset = 0;
1328 if (size > PAGE_SIZE)
1329 bi->bv_len = PAGE_SIZE;
1330 else
1331 bi->bv_len = size;
1332 size -= PAGE_SIZE;
1333 memcpy(page_address(bi->bv_page),
1334 page_address(pbio->bi_io_vec[j].bv_page),
1335 PAGE_SIZE);
1336 }
1337
1338 }
1339 }
1340 }
1341 if (!test_bit(R1BIO_Uptodate, &r1_bio->state)) {
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351 sector_t sect = r1_bio->sector;
1352 int sectors = r1_bio->sectors;
1353 int idx = 0;
1354
1355 while(sectors) {
1356 int s = sectors;
1357 int d = r1_bio->read_disk;
1358 int success = 0;
1359 mdk_rdev_t *rdev;
1360
1361 if (s > (PAGE_SIZE>>9))
1362 s = PAGE_SIZE >> 9;
1363 do {
1364 if (r1_bio->bios[d]->bi_end_io == end_sync_read) {
1365
1366
1367
1368
1369 rdev = conf->mirrors[d].rdev;
1370 if (sync_page_io(rdev,
1371 sect,
1372 s<<9,
1373 bio->bi_io_vec[idx].bv_page,
1374 READ, false)) {
1375 success = 1;
1376 break;
1377 }
1378 }
1379 d++;
1380 if (d == conf->raid_disks)
1381 d = 0;
1382 } while (!success && d != r1_bio->read_disk);
1383
1384 if (success) {
1385 int start = d;
1386
1387 set_bit(R1BIO_Uptodate, &r1_bio->state);
1388 while (d != r1_bio->read_disk) {
1389 if (d == 0)
1390 d = conf->raid_disks;
1391 d--;
1392 if (r1_bio->bios[d]->bi_end_io != end_sync_read)
1393 continue;
1394 rdev = conf->mirrors[d].rdev;
1395 atomic_add(s, &rdev->corrected_errors);
1396 if (sync_page_io(rdev,
1397 sect,
1398 s<<9,
1399 bio->bi_io_vec[idx].bv_page,
1400 WRITE, false) == 0)
1401 md_error(mddev, rdev);
1402 }
1403 d = start;
1404 while (d != r1_bio->read_disk) {
1405 if (d == 0)
1406 d = conf->raid_disks;
1407 d--;
1408 if (r1_bio->bios[d]->bi_end_io != end_sync_read)
1409 continue;
1410 rdev = conf->mirrors[d].rdev;
1411 if (sync_page_io(rdev,
1412 sect,
1413 s<<9,
1414 bio->bi_io_vec[idx].bv_page,
1415 READ, false) == 0)
1416 md_error(mddev, rdev);
1417 }
1418 } else {
1419 char b[BDEVNAME_SIZE];
1420
1421 md_error(mddev, conf->mirrors[r1_bio->read_disk].rdev);
1422 printk(KERN_ALERT "md/raid1:%s: %s: unrecoverable I/O read error"
1423 " for block %llu\n",
1424 mdname(mddev),
1425 bdevname(bio->bi_bdev, b),
1426 (unsigned long long)r1_bio->sector);
1427 md_done_sync(mddev, r1_bio->sectors, 0);
1428 put_buf(r1_bio);
1429 return;
1430 }
1431 sectors -= s;
1432 sect += s;
1433 idx ++;
1434 }
1435 }
1436
1437
1438
1439
1440 atomic_set(&r1_bio->remaining, 1);
1441 for (i = 0; i < disks ; i++) {
1442 wbio = r1_bio->bios[i];
1443 if (wbio->bi_end_io == NULL ||
1444 (wbio->bi_end_io == end_sync_read &&
1445 (i == r1_bio->read_disk ||
1446 !test_bit(MD_RECOVERY_SYNC, &mddev->recovery))))
1447 continue;
1448
1449 wbio->bi_rw = WRITE;
1450 wbio->bi_end_io = end_sync_write;
1451 atomic_inc(&r1_bio->remaining);
1452 md_sync_acct(conf->mirrors[i].rdev->bdev, wbio->bi_size >> 9);
1453
1454 generic_make_request(wbio);
1455 }
1456
1457 if (atomic_dec_and_test(&r1_bio->remaining)) {
1458
1459 md_done_sync(mddev, r1_bio->sectors, 1);
1460 put_buf(r1_bio);
1461 }
1462}
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472static void fix_read_error(conf_t *conf, int read_disk,
1473 sector_t sect, int sectors)
1474{
1475 mddev_t *mddev = conf->mddev;
1476 while(sectors) {
1477 int s = sectors;
1478 int d = read_disk;
1479 int success = 0;
1480 int start;
1481 mdk_rdev_t *rdev;
1482
1483 if (s > (PAGE_SIZE>>9))
1484 s = PAGE_SIZE >> 9;
1485
1486 do {
1487
1488
1489
1490
1491
1492 rdev = conf->mirrors[d].rdev;
1493 if (rdev &&
1494 test_bit(In_sync, &rdev->flags) &&
1495 sync_page_io(rdev, sect, s<<9,
1496 conf->tmppage, READ, false))
1497 success = 1;
1498 else {
1499 d++;
1500 if (d == conf->raid_disks)
1501 d = 0;
1502 }
1503 } while (!success && d != read_disk);
1504
1505 if (!success) {
1506
1507 md_error(mddev, conf->mirrors[read_disk].rdev);
1508 break;
1509 }
1510
1511 start = d;
1512 while (d != read_disk) {
1513 if (d==0)
1514 d = conf->raid_disks;
1515 d--;
1516 rdev = conf->mirrors[d].rdev;
1517 if (rdev &&
1518 test_bit(In_sync, &rdev->flags)) {
1519 if (sync_page_io(rdev, sect, s<<9,
1520 conf->tmppage, WRITE, false)
1521 == 0)
1522
1523 md_error(mddev, rdev);
1524 }
1525 }
1526 d = start;
1527 while (d != read_disk) {
1528 char b[BDEVNAME_SIZE];
1529 if (d==0)
1530 d = conf->raid_disks;
1531 d--;
1532 rdev = conf->mirrors[d].rdev;
1533 if (rdev &&
1534 test_bit(In_sync, &rdev->flags)) {
1535 if (sync_page_io(rdev, sect, s<<9,
1536 conf->tmppage, READ, false)
1537 == 0)
1538
1539 md_error(mddev, rdev);
1540 else {
1541 atomic_add(s, &rdev->corrected_errors);
1542 printk(KERN_INFO
1543 "md/raid1:%s: read error corrected "
1544 "(%d sectors at %llu on %s)\n",
1545 mdname(mddev), s,
1546 (unsigned long long)(sect +
1547 rdev->data_offset),
1548 bdevname(rdev->bdev, b));
1549 }
1550 }
1551 }
1552 sectors -= s;
1553 sect += s;
1554 }
1555}
1556
1557static void raid1d(mddev_t *mddev)
1558{
1559 r1bio_t *r1_bio;
1560 struct bio *bio;
1561 unsigned long flags;
1562 conf_t *conf = mddev->private;
1563 struct list_head *head = &conf->retry_list;
1564 int unplug=0;
1565 mdk_rdev_t *rdev;
1566
1567 md_check_recovery(mddev);
1568
1569 for (;;) {
1570 char b[BDEVNAME_SIZE];
1571
1572 unplug += flush_pending_writes(conf);
1573
1574 spin_lock_irqsave(&conf->device_lock, flags);
1575 if (list_empty(head)) {
1576 spin_unlock_irqrestore(&conf->device_lock, flags);
1577 break;
1578 }
1579 r1_bio = list_entry(head->prev, r1bio_t, retry_list);
1580 list_del(head->prev);
1581 conf->nr_queued--;
1582 spin_unlock_irqrestore(&conf->device_lock, flags);
1583
1584 mddev = r1_bio->mddev;
1585 conf = mddev->private;
1586 if (test_bit(R1BIO_IsSync, &r1_bio->state)) {
1587 sync_request_write(mddev, r1_bio);
1588 unplug = 1;
1589 } else {
1590 int disk;
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600 if (mddev->ro == 0) {
1601 freeze_array(conf);
1602 fix_read_error(conf, r1_bio->read_disk,
1603 r1_bio->sector,
1604 r1_bio->sectors);
1605 unfreeze_array(conf);
1606 } else
1607 md_error(mddev,
1608 conf->mirrors[r1_bio->read_disk].rdev);
1609
1610 bio = r1_bio->bios[r1_bio->read_disk];
1611 if ((disk=read_balance(conf, r1_bio)) == -1) {
1612 printk(KERN_ALERT "md/raid1:%s: %s: unrecoverable I/O"
1613 " read error for block %llu\n",
1614 mdname(mddev),
1615 bdevname(bio->bi_bdev,b),
1616 (unsigned long long)r1_bio->sector);
1617 raid_end_bio_io(r1_bio);
1618 } else {
1619 const unsigned long do_sync = r1_bio->master_bio->bi_rw & REQ_SYNC;
1620 r1_bio->bios[r1_bio->read_disk] =
1621 mddev->ro ? IO_BLOCKED : NULL;
1622 r1_bio->read_disk = disk;
1623 bio_put(bio);
1624 bio = bio_clone_mddev(r1_bio->master_bio,
1625 GFP_NOIO, mddev);
1626 r1_bio->bios[r1_bio->read_disk] = bio;
1627 rdev = conf->mirrors[disk].rdev;
1628 if (printk_ratelimit())
1629 printk(KERN_ERR "md/raid1:%s: redirecting sector %llu to"
1630 " other mirror: %s\n",
1631 mdname(mddev),
1632 (unsigned long long)r1_bio->sector,
1633 bdevname(rdev->bdev,b));
1634 bio->bi_sector = r1_bio->sector + rdev->data_offset;
1635 bio->bi_bdev = rdev->bdev;
1636 bio->bi_end_io = raid1_end_read_request;
1637 bio->bi_rw = READ | do_sync;
1638 bio->bi_private = r1_bio;
1639 unplug = 1;
1640 generic_make_request(bio);
1641 }
1642 }
1643 cond_resched();
1644 }
1645 if (unplug)
1646 unplug_slaves(mddev);
1647}
1648
1649
1650static int init_resync(conf_t *conf)
1651{
1652 int buffs;
1653
1654 buffs = RESYNC_WINDOW / RESYNC_BLOCK_SIZE;
1655 BUG_ON(conf->r1buf_pool);
1656 conf->r1buf_pool = mempool_create(buffs, r1buf_pool_alloc, r1buf_pool_free,
1657 conf->poolinfo);
1658 if (!conf->r1buf_pool)
1659 return -ENOMEM;
1660 conf->next_resync = 0;
1661 return 0;
1662}
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674static sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *skipped, int go_faster)
1675{
1676 conf_t *conf = mddev->private;
1677 r1bio_t *r1_bio;
1678 struct bio *bio;
1679 sector_t max_sector, nr_sectors;
1680 int disk = -1;
1681 int i;
1682 int wonly = -1;
1683 int write_targets = 0, read_targets = 0;
1684 sector_t sync_blocks;
1685 int still_degraded = 0;
1686
1687 if (!conf->r1buf_pool)
1688 if (init_resync(conf))
1689 return 0;
1690
1691 max_sector = mddev->dev_sectors;
1692 if (sector_nr >= max_sector) {
1693
1694
1695
1696
1697
1698 if (mddev->curr_resync < max_sector)
1699 bitmap_end_sync(mddev->bitmap, mddev->curr_resync,
1700 &sync_blocks, 1);
1701 else
1702 conf->fullsync = 0;
1703
1704 bitmap_close_sync(mddev->bitmap);
1705 close_sync(conf);
1706 return 0;
1707 }
1708
1709 if (mddev->bitmap == NULL &&
1710 mddev->recovery_cp == MaxSector &&
1711 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) &&
1712 conf->fullsync == 0) {
1713 *skipped = 1;
1714 return max_sector - sector_nr;
1715 }
1716
1717
1718
1719 if (!bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, 1) &&
1720 !conf->fullsync && !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
1721
1722 *skipped = 1;
1723 return sync_blocks;
1724 }
1725
1726
1727
1728
1729
1730 if (!go_faster && conf->nr_waiting)
1731 msleep_interruptible(1000);
1732
1733 bitmap_cond_end_sync(mddev->bitmap, sector_nr);
1734 r1_bio = mempool_alloc(conf->r1buf_pool, GFP_NOIO);
1735 raise_barrier(conf);
1736
1737 conf->next_resync = sector_nr;
1738
1739 rcu_read_lock();
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749 r1_bio->mddev = mddev;
1750 r1_bio->sector = sector_nr;
1751 r1_bio->state = 0;
1752 set_bit(R1BIO_IsSync, &r1_bio->state);
1753
1754 for (i=0; i < conf->raid_disks; i++) {
1755 mdk_rdev_t *rdev;
1756 bio = r1_bio->bios[i];
1757
1758
1759 bio->bi_next = NULL;
1760 bio->bi_flags &= ~(BIO_POOL_MASK-1);
1761 bio->bi_flags |= 1 << BIO_UPTODATE;
1762 bio->bi_comp_cpu = -1;
1763 bio->bi_rw = READ;
1764 bio->bi_vcnt = 0;
1765 bio->bi_idx = 0;
1766 bio->bi_phys_segments = 0;
1767 bio->bi_size = 0;
1768 bio->bi_end_io = NULL;
1769 bio->bi_private = NULL;
1770
1771 rdev = rcu_dereference(conf->mirrors[i].rdev);
1772 if (rdev == NULL ||
1773 test_bit(Faulty, &rdev->flags)) {
1774 still_degraded = 1;
1775 continue;
1776 } else if (!test_bit(In_sync, &rdev->flags)) {
1777 bio->bi_rw = WRITE;
1778 bio->bi_end_io = end_sync_write;
1779 write_targets ++;
1780 } else {
1781
1782 bio->bi_rw = READ;
1783 bio->bi_end_io = end_sync_read;
1784 if (test_bit(WriteMostly, &rdev->flags)) {
1785 if (wonly < 0)
1786 wonly = i;
1787 } else {
1788 if (disk < 0)
1789 disk = i;
1790 }
1791 read_targets++;
1792 }
1793 atomic_inc(&rdev->nr_pending);
1794 bio->bi_sector = sector_nr + rdev->data_offset;
1795 bio->bi_bdev = rdev->bdev;
1796 bio->bi_private = r1_bio;
1797 }
1798 rcu_read_unlock();
1799 if (disk < 0)
1800 disk = wonly;
1801 r1_bio->read_disk = disk;
1802
1803 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && read_targets > 0)
1804
1805 write_targets += read_targets-1;
1806
1807 if (write_targets == 0 || read_targets == 0) {
1808
1809
1810
1811 sector_t rv = max_sector - sector_nr;
1812 *skipped = 1;
1813 put_buf(r1_bio);
1814 return rv;
1815 }
1816
1817 if (max_sector > mddev->resync_max)
1818 max_sector = mddev->resync_max;
1819 nr_sectors = 0;
1820 sync_blocks = 0;
1821 do {
1822 struct page *page;
1823 int len = PAGE_SIZE;
1824 if (sector_nr + (len>>9) > max_sector)
1825 len = (max_sector - sector_nr) << 9;
1826 if (len == 0)
1827 break;
1828 if (sync_blocks == 0) {
1829 if (!bitmap_start_sync(mddev->bitmap, sector_nr,
1830 &sync_blocks, still_degraded) &&
1831 !conf->fullsync &&
1832 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
1833 break;
1834 BUG_ON(sync_blocks < (PAGE_SIZE>>9));
1835 if ((len >> 9) > sync_blocks)
1836 len = sync_blocks<<9;
1837 }
1838
1839 for (i=0 ; i < conf->raid_disks; i++) {
1840 bio = r1_bio->bios[i];
1841 if (bio->bi_end_io) {
1842 page = bio->bi_io_vec[bio->bi_vcnt].bv_page;
1843 if (bio_add_page(bio, page, len, 0) == 0) {
1844
1845 bio->bi_io_vec[bio->bi_vcnt].bv_page = page;
1846 while (i > 0) {
1847 i--;
1848 bio = r1_bio->bios[i];
1849 if (bio->bi_end_io==NULL)
1850 continue;
1851
1852 bio->bi_vcnt--;
1853 bio->bi_size -= len;
1854 bio->bi_flags &= ~(1<< BIO_SEG_VALID);
1855 }
1856 goto bio_full;
1857 }
1858 }
1859 }
1860 nr_sectors += len>>9;
1861 sector_nr += len>>9;
1862 sync_blocks -= (len>>9);
1863 } while (r1_bio->bios[disk]->bi_vcnt < RESYNC_PAGES);
1864 bio_full:
1865 r1_bio->sectors = nr_sectors;
1866
1867
1868
1869
1870 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
1871 atomic_set(&r1_bio->remaining, read_targets);
1872 for (i=0; i<conf->raid_disks; i++) {
1873 bio = r1_bio->bios[i];
1874 if (bio->bi_end_io == end_sync_read) {
1875 md_sync_acct(bio->bi_bdev, nr_sectors);
1876 generic_make_request(bio);
1877 }
1878 }
1879 } else {
1880 atomic_set(&r1_bio->remaining, 1);
1881 bio = r1_bio->bios[r1_bio->read_disk];
1882 md_sync_acct(bio->bi_bdev, nr_sectors);
1883 generic_make_request(bio);
1884
1885 }
1886 return nr_sectors;
1887}
1888
1889static sector_t raid1_size(mddev_t *mddev, sector_t sectors, int raid_disks)
1890{
1891 if (sectors)
1892 return sectors;
1893
1894 return mddev->dev_sectors;
1895}
1896
1897static conf_t *setup_conf(mddev_t *mddev)
1898{
1899 conf_t *conf;
1900 int i;
1901 mirror_info_t *disk;
1902 mdk_rdev_t *rdev;
1903 int err = -ENOMEM;
1904
1905 conf = kzalloc(sizeof(conf_t), GFP_KERNEL);
1906 if (!conf)
1907 goto abort;
1908
1909 conf->mirrors = kzalloc(sizeof(struct mirror_info)*mddev->raid_disks,
1910 GFP_KERNEL);
1911 if (!conf->mirrors)
1912 goto abort;
1913
1914 conf->tmppage = alloc_page(GFP_KERNEL);
1915 if (!conf->tmppage)
1916 goto abort;
1917
1918 conf->poolinfo = kzalloc(sizeof(*conf->poolinfo), GFP_KERNEL);
1919 if (!conf->poolinfo)
1920 goto abort;
1921 conf->poolinfo->raid_disks = mddev->raid_disks;
1922 conf->r1bio_pool = mempool_create(NR_RAID1_BIOS, r1bio_pool_alloc,
1923 r1bio_pool_free,
1924 conf->poolinfo);
1925 if (!conf->r1bio_pool)
1926 goto abort;
1927
1928 conf->poolinfo->mddev = mddev;
1929
1930 spin_lock_init(&conf->device_lock);
1931 list_for_each_entry(rdev, &mddev->disks, same_set) {
1932 int disk_idx = rdev->raid_disk;
1933 if (disk_idx >= mddev->raid_disks
1934 || disk_idx < 0)
1935 continue;
1936 disk = conf->mirrors + disk_idx;
1937
1938 disk->rdev = rdev;
1939
1940 disk->head_position = 0;
1941 }
1942 conf->raid_disks = mddev->raid_disks;
1943 conf->mddev = mddev;
1944 INIT_LIST_HEAD(&conf->retry_list);
1945
1946 spin_lock_init(&conf->resync_lock);
1947 init_waitqueue_head(&conf->wait_barrier);
1948
1949 bio_list_init(&conf->pending_bio_list);
1950
1951 conf->last_used = -1;
1952 for (i = 0; i < conf->raid_disks; i++) {
1953
1954 disk = conf->mirrors + i;
1955
1956 if (!disk->rdev ||
1957 !test_bit(In_sync, &disk->rdev->flags)) {
1958 disk->head_position = 0;
1959 if (disk->rdev)
1960 conf->fullsync = 1;
1961 } else if (conf->last_used < 0)
1962
1963
1964
1965
1966 conf->last_used = i;
1967 }
1968
1969 err = -EIO;
1970 if (conf->last_used < 0) {
1971 printk(KERN_ERR "md/raid1:%s: no operational mirrors\n",
1972 mdname(mddev));
1973 goto abort;
1974 }
1975 err = -ENOMEM;
1976 conf->thread = md_register_thread(raid1d, mddev, NULL);
1977 if (!conf->thread) {
1978 printk(KERN_ERR
1979 "md/raid1:%s: couldn't allocate thread\n",
1980 mdname(mddev));
1981 goto abort;
1982 }
1983
1984 return conf;
1985
1986 abort:
1987 if (conf) {
1988 if (conf->r1bio_pool)
1989 mempool_destroy(conf->r1bio_pool);
1990 kfree(conf->mirrors);
1991 safe_put_page(conf->tmppage);
1992 kfree(conf->poolinfo);
1993 kfree(conf);
1994 }
1995 return ERR_PTR(err);
1996}
1997
1998static int run(mddev_t *mddev)
1999{
2000 conf_t *conf;
2001 int i;
2002 mdk_rdev_t *rdev;
2003
2004 if (mddev->level != 1) {
2005 printk(KERN_ERR "md/raid1:%s: raid level not set to mirroring (%d)\n",
2006 mdname(mddev), mddev->level);
2007 return -EIO;
2008 }
2009 if (mddev->reshape_position != MaxSector) {
2010 printk(KERN_ERR "md/raid1:%s: reshape_position set but not supported\n",
2011 mdname(mddev));
2012 return -EIO;
2013 }
2014
2015
2016
2017
2018
2019 if (mddev->private == NULL)
2020 conf = setup_conf(mddev);
2021 else
2022 conf = mddev->private;
2023
2024 if (IS_ERR(conf))
2025 return PTR_ERR(conf);
2026
2027 list_for_each_entry(rdev, &mddev->disks, same_set) {
2028 disk_stack_limits(mddev->gendisk, rdev->bdev,
2029 rdev->data_offset << 9);
2030
2031
2032
2033
2034 if (rdev->bdev->bd_disk->queue->merge_bvec_fn) {
2035 blk_queue_max_segments(mddev->queue, 1);
2036 blk_queue_segment_boundary(mddev->queue,
2037 PAGE_CACHE_SIZE - 1);
2038 }
2039 }
2040
2041 mddev->degraded = 0;
2042 for (i=0; i < conf->raid_disks; i++)
2043 if (conf->mirrors[i].rdev == NULL ||
2044 !test_bit(In_sync, &conf->mirrors[i].rdev->flags) ||
2045 test_bit(Faulty, &conf->mirrors[i].rdev->flags))
2046 mddev->degraded++;
2047
2048 if (conf->raid_disks - mddev->degraded == 1)
2049 mddev->recovery_cp = MaxSector;
2050
2051 if (mddev->recovery_cp != MaxSector)
2052 printk(KERN_NOTICE "md/raid1:%s: not clean"
2053 " -- starting background reconstruction\n",
2054 mdname(mddev));
2055 printk(KERN_INFO
2056 "md/raid1:%s: active with %d out of %d mirrors\n",
2057 mdname(mddev), mddev->raid_disks - mddev->degraded,
2058 mddev->raid_disks);
2059
2060
2061
2062
2063 mddev->thread = conf->thread;
2064 conf->thread = NULL;
2065 mddev->private = conf;
2066
2067 md_set_array_sectors(mddev, raid1_size(mddev, 0, 0));
2068
2069 mddev->queue->unplug_fn = raid1_unplug;
2070 mddev->queue->backing_dev_info.congested_fn = raid1_congested;
2071 mddev->queue->backing_dev_info.congested_data = mddev;
2072 md_integrity_register(mddev);
2073 return 0;
2074}
2075
2076static int stop(mddev_t *mddev)
2077{
2078 conf_t *conf = mddev->private;
2079 struct bitmap *bitmap = mddev->bitmap;
2080
2081
2082 if (bitmap && atomic_read(&bitmap->behind_writes) > 0) {
2083 printk(KERN_INFO "md/raid1:%s: behind writes in progress - waiting to stop.\n",
2084 mdname(mddev));
2085
2086 wait_event(bitmap->behind_wait,
2087 atomic_read(&bitmap->behind_writes) == 0);
2088 }
2089
2090 raise_barrier(conf);
2091 lower_barrier(conf);
2092
2093 md_unregister_thread(mddev->thread);
2094 mddev->thread = NULL;
2095 blk_sync_queue(mddev->queue);
2096 if (conf->r1bio_pool)
2097 mempool_destroy(conf->r1bio_pool);
2098 kfree(conf->mirrors);
2099 kfree(conf->poolinfo);
2100 kfree(conf);
2101 mddev->private = NULL;
2102 return 0;
2103}
2104
2105static int raid1_resize(mddev_t *mddev, sector_t sectors)
2106{
2107
2108
2109
2110
2111
2112
2113
2114 md_set_array_sectors(mddev, raid1_size(mddev, sectors, 0));
2115 if (mddev->array_sectors > raid1_size(mddev, sectors, 0))
2116 return -EINVAL;
2117 set_capacity(mddev->gendisk, mddev->array_sectors);
2118 revalidate_disk(mddev->gendisk);
2119 if (sectors > mddev->dev_sectors &&
2120 mddev->recovery_cp == MaxSector) {
2121 mddev->recovery_cp = mddev->dev_sectors;
2122 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2123 }
2124 mddev->dev_sectors = sectors;
2125 mddev->resync_max_sectors = sectors;
2126 return 0;
2127}
2128
2129static int raid1_reshape(mddev_t *mddev)
2130{
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142 mempool_t *newpool, *oldpool;
2143 struct pool_info *newpoolinfo;
2144 mirror_info_t *newmirrors;
2145 conf_t *conf = mddev->private;
2146 int cnt, raid_disks;
2147 unsigned long flags;
2148 int d, d2, err;
2149
2150
2151 if (mddev->chunk_sectors != mddev->new_chunk_sectors ||
2152 mddev->layout != mddev->new_layout ||
2153 mddev->level != mddev->new_level) {
2154 mddev->new_chunk_sectors = mddev->chunk_sectors;
2155 mddev->new_layout = mddev->layout;
2156 mddev->new_level = mddev->level;
2157 return -EINVAL;
2158 }
2159
2160 err = md_allow_write(mddev);
2161 if (err)
2162 return err;
2163
2164 raid_disks = mddev->raid_disks + mddev->delta_disks;
2165
2166 if (raid_disks < conf->raid_disks) {
2167 cnt=0;
2168 for (d= 0; d < conf->raid_disks; d++)
2169 if (conf->mirrors[d].rdev)
2170 cnt++;
2171 if (cnt > raid_disks)
2172 return -EBUSY;
2173 }
2174
2175 newpoolinfo = kmalloc(sizeof(*newpoolinfo), GFP_KERNEL);
2176 if (!newpoolinfo)
2177 return -ENOMEM;
2178 newpoolinfo->mddev = mddev;
2179 newpoolinfo->raid_disks = raid_disks;
2180
2181 newpool = mempool_create(NR_RAID1_BIOS, r1bio_pool_alloc,
2182 r1bio_pool_free, newpoolinfo);
2183 if (!newpool) {
2184 kfree(newpoolinfo);
2185 return -ENOMEM;
2186 }
2187 newmirrors = kzalloc(sizeof(struct mirror_info) * raid_disks, GFP_KERNEL);
2188 if (!newmirrors) {
2189 kfree(newpoolinfo);
2190 mempool_destroy(newpool);
2191 return -ENOMEM;
2192 }
2193
2194 raise_barrier(conf);
2195
2196
2197 oldpool = conf->r1bio_pool;
2198 conf->r1bio_pool = newpool;
2199
2200 for (d = d2 = 0; d < conf->raid_disks; d++) {
2201 mdk_rdev_t *rdev = conf->mirrors[d].rdev;
2202 if (rdev && rdev->raid_disk != d2) {
2203 char nm[20];
2204 sprintf(nm, "rd%d", rdev->raid_disk);
2205 sysfs_remove_link(&mddev->kobj, nm);
2206 rdev->raid_disk = d2;
2207 sprintf(nm, "rd%d", rdev->raid_disk);
2208 sysfs_remove_link(&mddev->kobj, nm);
2209 if (sysfs_create_link(&mddev->kobj,
2210 &rdev->kobj, nm))
2211 printk(KERN_WARNING
2212 "md/raid1:%s: cannot register "
2213 "%s\n",
2214 mdname(mddev), nm);
2215 }
2216 if (rdev)
2217 newmirrors[d2++].rdev = rdev;
2218 }
2219 kfree(conf->mirrors);
2220 conf->mirrors = newmirrors;
2221 kfree(conf->poolinfo);
2222 conf->poolinfo = newpoolinfo;
2223
2224 spin_lock_irqsave(&conf->device_lock, flags);
2225 mddev->degraded += (raid_disks - conf->raid_disks);
2226 spin_unlock_irqrestore(&conf->device_lock, flags);
2227 conf->raid_disks = mddev->raid_disks = raid_disks;
2228 mddev->delta_disks = 0;
2229
2230 conf->last_used = 0;
2231 lower_barrier(conf);
2232
2233 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2234 md_wakeup_thread(mddev->thread);
2235
2236 mempool_destroy(oldpool);
2237 return 0;
2238}
2239
2240static void raid1_quiesce(mddev_t *mddev, int state)
2241{
2242 conf_t *conf = mddev->private;
2243
2244 switch(state) {
2245 case 2:
2246 wake_up(&conf->wait_barrier);
2247 break;
2248 case 1:
2249 raise_barrier(conf);
2250 break;
2251 case 0:
2252 lower_barrier(conf);
2253 break;
2254 }
2255}
2256
2257static void *raid1_takeover(mddev_t *mddev)
2258{
2259
2260
2261
2262 if (mddev->level == 5 && mddev->raid_disks == 2) {
2263 conf_t *conf;
2264 mddev->new_level = 1;
2265 mddev->new_layout = 0;
2266 mddev->new_chunk_sectors = 0;
2267 conf = setup_conf(mddev);
2268 if (!IS_ERR(conf))
2269 conf->barrier = 1;
2270 return conf;
2271 }
2272 return ERR_PTR(-EINVAL);
2273}
2274
2275static struct mdk_personality raid1_personality =
2276{
2277 .name = "raid1",
2278 .level = 1,
2279 .owner = THIS_MODULE,
2280 .make_request = make_request,
2281 .run = run,
2282 .stop = stop,
2283 .status = status,
2284 .error_handler = error,
2285 .hot_add_disk = raid1_add_disk,
2286 .hot_remove_disk= raid1_remove_disk,
2287 .spare_active = raid1_spare_active,
2288 .sync_request = sync_request,
2289 .resize = raid1_resize,
2290 .size = raid1_size,
2291 .check_reshape = raid1_reshape,
2292 .quiesce = raid1_quiesce,
2293 .takeover = raid1_takeover,
2294};
2295
2296static int __init raid_init(void)
2297{
2298 return register_md_personality(&raid1_personality);
2299}
2300
2301static void raid_exit(void)
2302{
2303 unregister_md_personality(&raid1_personality);
2304}
2305
2306module_init(raid_init);
2307module_exit(raid_exit);
2308MODULE_LICENSE("GPL");
2309MODULE_DESCRIPTION("RAID1 (mirroring) personality for MD");
2310MODULE_ALIAS("md-personality-3");
2311MODULE_ALIAS("md-raid1");
2312MODULE_ALIAS("md-level-1");
2313