2 * raid1.c : Multiple Devices driver for Linux
4 * Copyright (C) 1999, 2000, 2001 Ingo Molnar, Red Hat
6 * Copyright (C) 1996, 1997, 1998 Ingo Molnar, Miguel de Icaza, Gadi Oxman
8 * RAID-1 management functions.
10 * Better read-balancing code written by Mika Kuoppala <miku@iki.fi>, 2000
12 * Fixes to reconstruction by Jakob Østergaard" <jakob@ostenfeld.dk>
13 * Various fixes by Neil Brown <neilb@cse.unsw.edu.au>
15 * Changes by Peter T. Breuer <ptb@it.uc3m.es> 31/1/2003 to support
16 * bitmapped intelligence in resync:
18 * - bitmap marked during normal i/o
19 * - bitmap used to skip nondirty blocks during sync
21 * Additions to bitmap code, (C) 2003-2004 Paul Clements, SteelEye Technology:
22 * - persistent bitmap code
24 * This program is free software; you can redistribute it and/or modify
25 * it under the terms of the GNU General Public License as published by
26 * the Free Software Foundation; either version 2, or (at your option)
29 * You should have received a copy of the GNU General Public License
30 * (for example /usr/src/linux/COPYING); if not, write to the Free
31 * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
34 #include <linux/slab.h>
35 #include <linux/delay.h>
36 #include <linux/blkdev.h>
37 #include <linux/module.h>
38 #include <linux/seq_file.h>
39 #include <linux/ratelimit.h>
40 #include <trace/events/block.h>
45 #define UNSUPPORTED_MDDEV_FLAGS \
46 ((1L << MD_HAS_JOURNAL) | \
47 (1L << MD_JOURNAL_CLEAN))
50 * Number of guaranteed r1bios in case of extreme VM load:
52 #define NR_RAID1_BIOS 256
54 /* when we get a read error on a read-only array, we redirect to another
55 * device without failing the first device, or trying to over-write to
56 * correct the read error. To keep track of bad blocks on a per-bio
57 * level, we store IO_BLOCKED in the appropriate 'bios' pointer
59 #define IO_BLOCKED ((struct bio *)1)
60 /* When we successfully write to a known bad-block, we need to remove the
61 * bad-block marking which must be done from process context. So we record
62 * the success by setting devs[n].bio to IO_MADE_GOOD
64 #define IO_MADE_GOOD ((struct bio *)2)
66 #define BIO_SPECIAL(bio) ((unsigned long)bio <= 2)
68 /* When there are this many requests queue to be written by
69 * the raid1 thread, we become 'congested' to provide back-pressure
72 static int max_queued_requests
= 1024;
74 static void allow_barrier(struct r1conf
*conf
, sector_t start_next_window
,
76 static void lower_barrier(struct r1conf
*conf
);
78 #define raid1_log(md, fmt, args...) \
79 do { if ((md)->queue) blk_add_trace_msg((md)->queue, "raid1 " fmt, ##args); } while (0)
81 static void * r1bio_pool_alloc(gfp_t gfp_flags
, void *data
)
83 struct pool_info
*pi
= data
;
84 int size
= offsetof(struct r1bio
, bios
[pi
->raid_disks
]);
86 /* allocate a r1bio with room for raid_disks entries in the bios array */
87 return kzalloc(size
, gfp_flags
);
90 static void r1bio_pool_free(void *r1_bio
, void *data
)
95 #define RESYNC_BLOCK_SIZE (64*1024)
96 #define RESYNC_DEPTH 32
97 #define RESYNC_SECTORS (RESYNC_BLOCK_SIZE >> 9)
98 #define RESYNC_PAGES ((RESYNC_BLOCK_SIZE + PAGE_SIZE-1) / PAGE_SIZE)
99 #define RESYNC_WINDOW (RESYNC_BLOCK_SIZE * RESYNC_DEPTH)
100 #define RESYNC_WINDOW_SECTORS (RESYNC_WINDOW >> 9)
101 #define CLUSTER_RESYNC_WINDOW (16 * RESYNC_WINDOW)
102 #define CLUSTER_RESYNC_WINDOW_SECTORS (CLUSTER_RESYNC_WINDOW >> 9)
103 #define NEXT_NORMALIO_DISTANCE (3 * RESYNC_WINDOW_SECTORS)
105 static void * r1buf_pool_alloc(gfp_t gfp_flags
, void *data
)
107 struct pool_info
*pi
= data
;
108 struct r1bio
*r1_bio
;
113 r1_bio
= r1bio_pool_alloc(gfp_flags
, pi
);
118 * Allocate bios : 1 for reading, n-1 for writing
120 for (j
= pi
->raid_disks
; j
-- ; ) {
121 bio
= bio_kmalloc(gfp_flags
, RESYNC_PAGES
);
124 r1_bio
->bios
[j
] = bio
;
127 * Allocate RESYNC_PAGES data pages and attach them to
129 * If this is a user-requested check/repair, allocate
130 * RESYNC_PAGES for each bio.
132 if (test_bit(MD_RECOVERY_REQUESTED
, &pi
->mddev
->recovery
))
133 need_pages
= pi
->raid_disks
;
136 for (j
= 0; j
< need_pages
; j
++) {
137 bio
= r1_bio
->bios
[j
];
138 bio
->bi_vcnt
= RESYNC_PAGES
;
140 if (bio_alloc_pages(bio
, gfp_flags
))
143 /* If not user-requests, copy the page pointers to all bios */
144 if (!test_bit(MD_RECOVERY_REQUESTED
, &pi
->mddev
->recovery
)) {
145 for (i
=0; i
<RESYNC_PAGES
; i
++)
146 for (j
=1; j
<pi
->raid_disks
; j
++)
147 r1_bio
->bios
[j
]->bi_io_vec
[i
].bv_page
=
148 r1_bio
->bios
[0]->bi_io_vec
[i
].bv_page
;
151 r1_bio
->master_bio
= NULL
;
157 bio_free_pages(r1_bio
->bios
[j
]);
160 while (++j
< pi
->raid_disks
)
161 bio_put(r1_bio
->bios
[j
]);
162 r1bio_pool_free(r1_bio
, data
);
166 static void r1buf_pool_free(void *__r1_bio
, void *data
)
168 struct pool_info
*pi
= data
;
170 struct r1bio
*r1bio
= __r1_bio
;
172 for (i
= 0; i
< RESYNC_PAGES
; i
++)
173 for (j
= pi
->raid_disks
; j
-- ;) {
175 r1bio
->bios
[j
]->bi_io_vec
[i
].bv_page
!=
176 r1bio
->bios
[0]->bi_io_vec
[i
].bv_page
)
177 safe_put_page(r1bio
->bios
[j
]->bi_io_vec
[i
].bv_page
);
179 for (i
=0 ; i
< pi
->raid_disks
; i
++)
180 bio_put(r1bio
->bios
[i
]);
182 r1bio_pool_free(r1bio
, data
);
185 static void put_all_bios(struct r1conf
*conf
, struct r1bio
*r1_bio
)
189 for (i
= 0; i
< conf
->raid_disks
* 2; i
++) {
190 struct bio
**bio
= r1_bio
->bios
+ i
;
191 if (!BIO_SPECIAL(*bio
))
197 static void free_r1bio(struct r1bio
*r1_bio
)
199 struct r1conf
*conf
= r1_bio
->mddev
->private;
201 put_all_bios(conf
, r1_bio
);
202 mempool_free(r1_bio
, conf
->r1bio_pool
);
205 static void put_buf(struct r1bio
*r1_bio
)
207 struct r1conf
*conf
= r1_bio
->mddev
->private;
210 for (i
= 0; i
< conf
->raid_disks
* 2; i
++) {
211 struct bio
*bio
= r1_bio
->bios
[i
];
213 rdev_dec_pending(conf
->mirrors
[i
].rdev
, r1_bio
->mddev
);
216 mempool_free(r1_bio
, conf
->r1buf_pool
);
221 static void reschedule_retry(struct r1bio
*r1_bio
)
224 struct mddev
*mddev
= r1_bio
->mddev
;
225 struct r1conf
*conf
= mddev
->private;
227 spin_lock_irqsave(&conf
->device_lock
, flags
);
228 list_add(&r1_bio
->retry_list
, &conf
->retry_list
);
230 spin_unlock_irqrestore(&conf
->device_lock
, flags
);
232 wake_up(&conf
->wait_barrier
);
233 md_wakeup_thread(mddev
->thread
);
237 * raid_end_bio_io() is called when we have finished servicing a mirrored
238 * operation and are ready to return a success/failure code to the buffer
241 static void call_bio_endio(struct r1bio
*r1_bio
)
243 struct bio
*bio
= r1_bio
->master_bio
;
245 struct r1conf
*conf
= r1_bio
->mddev
->private;
246 sector_t start_next_window
= r1_bio
->start_next_window
;
247 sector_t bi_sector
= bio
->bi_iter
.bi_sector
;
249 if (bio
->bi_phys_segments
) {
251 spin_lock_irqsave(&conf
->device_lock
, flags
);
252 bio
->bi_phys_segments
--;
253 done
= (bio
->bi_phys_segments
== 0);
254 spin_unlock_irqrestore(&conf
->device_lock
, flags
);
256 * make_request() might be waiting for
257 * bi_phys_segments to decrease
259 wake_up(&conf
->wait_barrier
);
263 if (!test_bit(R1BIO_Uptodate
, &r1_bio
->state
))
264 bio
->bi_error
= -EIO
;
269 * Wake up any possible resync thread that waits for the device
272 allow_barrier(conf
, start_next_window
, bi_sector
);
276 static void raid_end_bio_io(struct r1bio
*r1_bio
)
278 struct bio
*bio
= r1_bio
->master_bio
;
280 /* if nobody has done the final endio yet, do it now */
281 if (!test_and_set_bit(R1BIO_Returned
, &r1_bio
->state
)) {
282 pr_debug("raid1: sync end %s on sectors %llu-%llu\n",
283 (bio_data_dir(bio
) == WRITE
) ? "write" : "read",
284 (unsigned long long) bio
->bi_iter
.bi_sector
,
285 (unsigned long long) bio_end_sector(bio
) - 1);
287 call_bio_endio(r1_bio
);
293 * Update disk head position estimator based on IRQ completion info.
295 static inline void update_head_pos(int disk
, struct r1bio
*r1_bio
)
297 struct r1conf
*conf
= r1_bio
->mddev
->private;
299 conf
->mirrors
[disk
].head_position
=
300 r1_bio
->sector
+ (r1_bio
->sectors
);
304 * Find the disk number which triggered given bio
306 static int find_bio_disk(struct r1bio
*r1_bio
, struct bio
*bio
)
309 struct r1conf
*conf
= r1_bio
->mddev
->private;
310 int raid_disks
= conf
->raid_disks
;
312 for (mirror
= 0; mirror
< raid_disks
* 2; mirror
++)
313 if (r1_bio
->bios
[mirror
] == bio
)
316 BUG_ON(mirror
== raid_disks
* 2);
317 update_head_pos(mirror
, r1_bio
);
322 static void raid1_end_read_request(struct bio
*bio
)
324 int uptodate
= !bio
->bi_error
;
325 struct r1bio
*r1_bio
= bio
->bi_private
;
326 struct r1conf
*conf
= r1_bio
->mddev
->private;
327 struct md_rdev
*rdev
= conf
->mirrors
[r1_bio
->read_disk
].rdev
;
330 * this branch is our 'one mirror IO has finished' event handler:
332 update_head_pos(r1_bio
->read_disk
, r1_bio
);
335 set_bit(R1BIO_Uptodate
, &r1_bio
->state
);
336 else if (test_bit(FailFast
, &rdev
->flags
) &&
337 test_bit(R1BIO_FailFast
, &r1_bio
->state
))
338 /* This was a fail-fast read so we definitely
342 /* If all other devices have failed, we want to return
343 * the error upwards rather than fail the last device.
344 * Here we redefine "uptodate" to mean "Don't want to retry"
347 spin_lock_irqsave(&conf
->device_lock
, flags
);
348 if (r1_bio
->mddev
->degraded
== conf
->raid_disks
||
349 (r1_bio
->mddev
->degraded
== conf
->raid_disks
-1 &&
350 test_bit(In_sync
, &rdev
->flags
)))
352 spin_unlock_irqrestore(&conf
->device_lock
, flags
);
356 raid_end_bio_io(r1_bio
);
357 rdev_dec_pending(rdev
, conf
->mddev
);
362 char b
[BDEVNAME_SIZE
];
363 pr_err_ratelimited("md/raid1:%s: %s: rescheduling sector %llu\n",
365 bdevname(rdev
->bdev
, b
),
366 (unsigned long long)r1_bio
->sector
);
367 set_bit(R1BIO_ReadError
, &r1_bio
->state
);
368 reschedule_retry(r1_bio
);
369 /* don't drop the reference on read_disk yet */
373 static void close_write(struct r1bio
*r1_bio
)
375 /* it really is the end of this request */
376 if (test_bit(R1BIO_BehindIO
, &r1_bio
->state
)) {
377 /* free extra copy of the data pages */
378 int i
= r1_bio
->behind_page_count
;
380 safe_put_page(r1_bio
->behind_bvecs
[i
].bv_page
);
381 kfree(r1_bio
->behind_bvecs
);
382 r1_bio
->behind_bvecs
= NULL
;
384 /* clear the bitmap if all writes complete successfully */
385 bitmap_endwrite(r1_bio
->mddev
->bitmap
, r1_bio
->sector
,
387 !test_bit(R1BIO_Degraded
, &r1_bio
->state
),
388 test_bit(R1BIO_BehindIO
, &r1_bio
->state
));
389 md_write_end(r1_bio
->mddev
);
392 static void r1_bio_write_done(struct r1bio
*r1_bio
)
394 if (!atomic_dec_and_test(&r1_bio
->remaining
))
397 if (test_bit(R1BIO_WriteError
, &r1_bio
->state
))
398 reschedule_retry(r1_bio
);
401 if (test_bit(R1BIO_MadeGood
, &r1_bio
->state
))
402 reschedule_retry(r1_bio
);
404 raid_end_bio_io(r1_bio
);
408 static void raid1_end_write_request(struct bio
*bio
)
410 struct r1bio
*r1_bio
= bio
->bi_private
;
411 int behind
= test_bit(R1BIO_BehindIO
, &r1_bio
->state
);
412 struct r1conf
*conf
= r1_bio
->mddev
->private;
413 struct bio
*to_put
= NULL
;
414 int mirror
= find_bio_disk(r1_bio
, bio
);
415 struct md_rdev
*rdev
= conf
->mirrors
[mirror
].rdev
;
418 discard_error
= bio
->bi_error
&& bio_op(bio
) == REQ_OP_DISCARD
;
421 * 'one mirror IO has finished' event handler:
423 if (bio
->bi_error
&& !discard_error
) {
424 set_bit(WriteErrorSeen
, &rdev
->flags
);
425 if (!test_and_set_bit(WantReplacement
, &rdev
->flags
))
426 set_bit(MD_RECOVERY_NEEDED
, &
427 conf
->mddev
->recovery
);
429 if (test_bit(FailFast
, &rdev
->flags
) &&
430 (bio
->bi_opf
& MD_FAILFAST
) &&
431 /* We never try FailFast to WriteMostly devices */
432 !test_bit(WriteMostly
, &rdev
->flags
)) {
433 md_error(r1_bio
->mddev
, rdev
);
434 if (!test_bit(Faulty
, &rdev
->flags
))
435 /* This is the only remaining device,
436 * We need to retry the write without
439 set_bit(R1BIO_WriteError
, &r1_bio
->state
);
441 /* Finished with this branch */
442 r1_bio
->bios
[mirror
] = NULL
;
446 set_bit(R1BIO_WriteError
, &r1_bio
->state
);
449 * Set R1BIO_Uptodate in our master bio, so that we
450 * will return a good error code for to the higher
451 * levels even if IO on some other mirrored buffer
454 * The 'master' represents the composite IO operation
455 * to user-side. So if something waits for IO, then it
456 * will wait for the 'master' bio.
461 r1_bio
->bios
[mirror
] = NULL
;
464 * Do not set R1BIO_Uptodate if the current device is
465 * rebuilding or Faulty. This is because we cannot use
466 * such device for properly reading the data back (we could
467 * potentially use it, if the current write would have felt
468 * before rdev->recovery_offset, but for simplicity we don't
471 if (test_bit(In_sync
, &rdev
->flags
) &&
472 !test_bit(Faulty
, &rdev
->flags
))
473 set_bit(R1BIO_Uptodate
, &r1_bio
->state
);
475 /* Maybe we can clear some bad blocks. */
476 if (is_badblock(rdev
, r1_bio
->sector
, r1_bio
->sectors
,
477 &first_bad
, &bad_sectors
) && !discard_error
) {
478 r1_bio
->bios
[mirror
] = IO_MADE_GOOD
;
479 set_bit(R1BIO_MadeGood
, &r1_bio
->state
);
484 if (test_bit(WriteMostly
, &rdev
->flags
))
485 atomic_dec(&r1_bio
->behind_remaining
);
488 * In behind mode, we ACK the master bio once the I/O
489 * has safely reached all non-writemostly
490 * disks. Setting the Returned bit ensures that this
491 * gets done only once -- we don't ever want to return
492 * -EIO here, instead we'll wait
494 if (atomic_read(&r1_bio
->behind_remaining
) >= (atomic_read(&r1_bio
->remaining
)-1) &&
495 test_bit(R1BIO_Uptodate
, &r1_bio
->state
)) {
496 /* Maybe we can return now */
497 if (!test_and_set_bit(R1BIO_Returned
, &r1_bio
->state
)) {
498 struct bio
*mbio
= r1_bio
->master_bio
;
499 pr_debug("raid1: behind end write sectors"
501 (unsigned long long) mbio
->bi_iter
.bi_sector
,
502 (unsigned long long) bio_end_sector(mbio
) - 1);
503 call_bio_endio(r1_bio
);
507 if (r1_bio
->bios
[mirror
] == NULL
)
508 rdev_dec_pending(rdev
, conf
->mddev
);
511 * Let's see if all mirrored write operations have finished
514 r1_bio_write_done(r1_bio
);
521 * This routine returns the disk from which the requested read should
522 * be done. There is a per-array 'next expected sequential IO' sector
523 * number - if this matches on the next IO then we use the last disk.
524 * There is also a per-disk 'last know head position' sector that is
525 * maintained from IRQ contexts, both the normal and the resync IO
526 * completion handlers update this position correctly. If there is no
527 * perfect sequential match then we pick the disk whose head is closest.
529 * If there are 2 mirrors in the same 2 devices, performance degrades
530 * because position is mirror, not device based.
532 * The rdev for the device selected will have nr_pending incremented.
534 static int read_balance(struct r1conf
*conf
, struct r1bio
*r1_bio
, int *max_sectors
)
536 const sector_t this_sector
= r1_bio
->sector
;
538 int best_good_sectors
;
539 int best_disk
, best_dist_disk
, best_pending_disk
;
543 unsigned int min_pending
;
544 struct md_rdev
*rdev
;
546 int choose_next_idle
;
550 * Check if we can balance. We can balance on the whole
551 * device if no resync is going on, or below the resync window.
552 * We take the first readable disk when above the resync window.
555 sectors
= r1_bio
->sectors
;
558 best_dist
= MaxSector
;
559 best_pending_disk
= -1;
560 min_pending
= UINT_MAX
;
561 best_good_sectors
= 0;
563 choose_next_idle
= 0;
564 clear_bit(R1BIO_FailFast
, &r1_bio
->state
);
566 if ((conf
->mddev
->recovery_cp
< this_sector
+ sectors
) ||
567 (mddev_is_clustered(conf
->mddev
) &&
568 md_cluster_ops
->area_resyncing(conf
->mddev
, READ
, this_sector
,
569 this_sector
+ sectors
)))
574 for (disk
= 0 ; disk
< conf
->raid_disks
* 2 ; disk
++) {
578 unsigned int pending
;
581 rdev
= rcu_dereference(conf
->mirrors
[disk
].rdev
);
582 if (r1_bio
->bios
[disk
] == IO_BLOCKED
584 || test_bit(Faulty
, &rdev
->flags
))
586 if (!test_bit(In_sync
, &rdev
->flags
) &&
587 rdev
->recovery_offset
< this_sector
+ sectors
)
589 if (test_bit(WriteMostly
, &rdev
->flags
)) {
590 /* Don't balance among write-mostly, just
591 * use the first as a last resort */
592 if (best_dist_disk
< 0) {
593 if (is_badblock(rdev
, this_sector
, sectors
,
594 &first_bad
, &bad_sectors
)) {
595 if (first_bad
<= this_sector
)
596 /* Cannot use this */
598 best_good_sectors
= first_bad
- this_sector
;
600 best_good_sectors
= sectors
;
601 best_dist_disk
= disk
;
602 best_pending_disk
= disk
;
606 /* This is a reasonable device to use. It might
609 if (is_badblock(rdev
, this_sector
, sectors
,
610 &first_bad
, &bad_sectors
)) {
611 if (best_dist
< MaxSector
)
612 /* already have a better device */
614 if (first_bad
<= this_sector
) {
615 /* cannot read here. If this is the 'primary'
616 * device, then we must not read beyond
617 * bad_sectors from another device..
619 bad_sectors
-= (this_sector
- first_bad
);
620 if (choose_first
&& sectors
> bad_sectors
)
621 sectors
= bad_sectors
;
622 if (best_good_sectors
> sectors
)
623 best_good_sectors
= sectors
;
626 sector_t good_sectors
= first_bad
- this_sector
;
627 if (good_sectors
> best_good_sectors
) {
628 best_good_sectors
= good_sectors
;
636 best_good_sectors
= sectors
;
639 /* At least two disks to choose from so failfast is OK */
640 set_bit(R1BIO_FailFast
, &r1_bio
->state
);
642 nonrot
= blk_queue_nonrot(bdev_get_queue(rdev
->bdev
));
643 has_nonrot_disk
|= nonrot
;
644 pending
= atomic_read(&rdev
->nr_pending
);
645 dist
= abs(this_sector
- conf
->mirrors
[disk
].head_position
);
650 /* Don't change to another disk for sequential reads */
651 if (conf
->mirrors
[disk
].next_seq_sect
== this_sector
653 int opt_iosize
= bdev_io_opt(rdev
->bdev
) >> 9;
654 struct raid1_info
*mirror
= &conf
->mirrors
[disk
];
658 * If buffered sequential IO size exceeds optimal
659 * iosize, check if there is idle disk. If yes, choose
660 * the idle disk. read_balance could already choose an
661 * idle disk before noticing it's a sequential IO in
662 * this disk. This doesn't matter because this disk
663 * will idle, next time it will be utilized after the
664 * first disk has IO size exceeds optimal iosize. In
665 * this way, iosize of the first disk will be optimal
666 * iosize at least. iosize of the second disk might be
667 * small, but not a big deal since when the second disk
668 * starts IO, the first disk is likely still busy.
670 if (nonrot
&& opt_iosize
> 0 &&
671 mirror
->seq_start
!= MaxSector
&&
672 mirror
->next_seq_sect
> opt_iosize
&&
673 mirror
->next_seq_sect
- opt_iosize
>=
675 choose_next_idle
= 1;
681 if (choose_next_idle
)
684 if (min_pending
> pending
) {
685 min_pending
= pending
;
686 best_pending_disk
= disk
;
689 if (dist
< best_dist
) {
691 best_dist_disk
= disk
;
696 * If all disks are rotational, choose the closest disk. If any disk is
697 * non-rotational, choose the disk with less pending request even the
698 * disk is rotational, which might/might not be optimal for raids with
699 * mixed ratation/non-rotational disks depending on workload.
701 if (best_disk
== -1) {
702 if (has_nonrot_disk
|| min_pending
== 0)
703 best_disk
= best_pending_disk
;
705 best_disk
= best_dist_disk
;
708 if (best_disk
>= 0) {
709 rdev
= rcu_dereference(conf
->mirrors
[best_disk
].rdev
);
712 atomic_inc(&rdev
->nr_pending
);
713 sectors
= best_good_sectors
;
715 if (conf
->mirrors
[best_disk
].next_seq_sect
!= this_sector
)
716 conf
->mirrors
[best_disk
].seq_start
= this_sector
;
718 conf
->mirrors
[best_disk
].next_seq_sect
= this_sector
+ sectors
;
721 *max_sectors
= sectors
;
726 static int raid1_congested(struct mddev
*mddev
, int bits
)
728 struct r1conf
*conf
= mddev
->private;
731 if ((bits
& (1 << WB_async_congested
)) &&
732 conf
->pending_count
>= max_queued_requests
)
736 for (i
= 0; i
< conf
->raid_disks
* 2; i
++) {
737 struct md_rdev
*rdev
= rcu_dereference(conf
->mirrors
[i
].rdev
);
738 if (rdev
&& !test_bit(Faulty
, &rdev
->flags
)) {
739 struct request_queue
*q
= bdev_get_queue(rdev
->bdev
);
743 /* Note the '|| 1' - when read_balance prefers
744 * non-congested targets, it can be removed
746 if ((bits
& (1 << WB_async_congested
)) || 1)
747 ret
|= bdi_congested(&q
->backing_dev_info
, bits
);
749 ret
&= bdi_congested(&q
->backing_dev_info
, bits
);
756 static void flush_pending_writes(struct r1conf
*conf
)
758 /* Any writes that have been queued but are awaiting
759 * bitmap updates get flushed here.
761 spin_lock_irq(&conf
->device_lock
);
763 if (conf
->pending_bio_list
.head
) {
765 bio
= bio_list_get(&conf
->pending_bio_list
);
766 conf
->pending_count
= 0;
767 spin_unlock_irq(&conf
->device_lock
);
768 /* flush any pending bitmap writes to
769 * disk before proceeding w/ I/O */
770 bitmap_unplug(conf
->mddev
->bitmap
);
771 wake_up(&conf
->wait_barrier
);
773 while (bio
) { /* submit pending writes */
774 struct bio
*next
= bio
->bi_next
;
775 struct md_rdev
*rdev
= (void*)bio
->bi_bdev
;
777 bio
->bi_bdev
= rdev
->bdev
;
778 if (test_bit(Faulty
, &rdev
->flags
)) {
779 bio
->bi_error
= -EIO
;
781 } else if (unlikely((bio_op(bio
) == REQ_OP_DISCARD
) &&
782 !blk_queue_discard(bdev_get_queue(bio
->bi_bdev
))))
786 generic_make_request(bio
);
790 spin_unlock_irq(&conf
->device_lock
);
794 * Sometimes we need to suspend IO while we do something else,
795 * either some resync/recovery, or reconfigure the array.
796 * To do this we raise a 'barrier'.
797 * The 'barrier' is a counter that can be raised multiple times
798 * to count how many activities are happening which preclude
800 * We can only raise the barrier if there is no pending IO.
801 * i.e. if nr_pending == 0.
802 * We choose only to raise the barrier if no-one is waiting for the
803 * barrier to go down. This means that as soon as an IO request
804 * is ready, no other operations which require a barrier will start
805 * until the IO request has had a chance.
807 * So: regular IO calls 'wait_barrier'. When that returns there
808 * is no backgroup IO happening, It must arrange to call
809 * allow_barrier when it has finished its IO.
810 * backgroup IO calls must call raise_barrier. Once that returns
811 * there is no normal IO happeing. It must arrange to call
812 * lower_barrier when the particular background IO completes.
814 static void raise_barrier(struct r1conf
*conf
, sector_t sector_nr
)
816 spin_lock_irq(&conf
->resync_lock
);
818 /* Wait until no block IO is waiting */
819 wait_event_lock_irq(conf
->wait_barrier
, !conf
->nr_waiting
,
822 /* block any new IO from starting */
824 conf
->next_resync
= sector_nr
;
826 /* For these conditions we must wait:
827 * A: while the array is in frozen state
828 * B: while barrier >= RESYNC_DEPTH, meaning resync reach
829 * the max count which allowed.
830 * C: next_resync + RESYNC_SECTORS > start_next_window, meaning
831 * next resync will reach to the window which normal bios are
833 * D: while there are any active requests in the current window.
835 wait_event_lock_irq(conf
->wait_barrier
,
836 !conf
->array_frozen
&&
837 conf
->barrier
< RESYNC_DEPTH
&&
838 conf
->current_window_requests
== 0 &&
839 (conf
->start_next_window
>=
840 conf
->next_resync
+ RESYNC_SECTORS
),
844 spin_unlock_irq(&conf
->resync_lock
);
847 static void lower_barrier(struct r1conf
*conf
)
850 BUG_ON(conf
->barrier
<= 0);
851 spin_lock_irqsave(&conf
->resync_lock
, flags
);
854 spin_unlock_irqrestore(&conf
->resync_lock
, flags
);
855 wake_up(&conf
->wait_barrier
);
858 static bool need_to_wait_for_sync(struct r1conf
*conf
, struct bio
*bio
)
862 if (conf
->array_frozen
|| !bio
)
864 else if (conf
->barrier
&& bio_data_dir(bio
) == WRITE
) {
865 if ((conf
->mddev
->curr_resync_completed
866 >= bio_end_sector(bio
)) ||
867 (conf
->start_next_window
+ NEXT_NORMALIO_DISTANCE
868 <= bio
->bi_iter
.bi_sector
))
877 static sector_t
wait_barrier(struct r1conf
*conf
, struct bio
*bio
)
881 spin_lock_irq(&conf
->resync_lock
);
882 if (need_to_wait_for_sync(conf
, bio
)) {
884 /* Wait for the barrier to drop.
885 * However if there are already pending
886 * requests (preventing the barrier from
887 * rising completely), and the
888 * per-process bio queue isn't empty,
889 * then don't wait, as we need to empty
890 * that queue to allow conf->start_next_window
893 raid1_log(conf
->mddev
, "wait barrier");
894 wait_event_lock_irq(conf
->wait_barrier
,
895 !conf
->array_frozen
&&
897 ((conf
->start_next_window
<
898 conf
->next_resync
+ RESYNC_SECTORS
) &&
900 !bio_list_empty(current
->bio_list
))),
905 if (bio
&& bio_data_dir(bio
) == WRITE
) {
906 if (bio
->bi_iter
.bi_sector
>= conf
->next_resync
) {
907 if (conf
->start_next_window
== MaxSector
)
908 conf
->start_next_window
=
910 NEXT_NORMALIO_DISTANCE
;
912 if ((conf
->start_next_window
+ NEXT_NORMALIO_DISTANCE
)
913 <= bio
->bi_iter
.bi_sector
)
914 conf
->next_window_requests
++;
916 conf
->current_window_requests
++;
917 sector
= conf
->start_next_window
;
922 spin_unlock_irq(&conf
->resync_lock
);
926 static void allow_barrier(struct r1conf
*conf
, sector_t start_next_window
,
931 spin_lock_irqsave(&conf
->resync_lock
, flags
);
933 if (start_next_window
) {
934 if (start_next_window
== conf
->start_next_window
) {
935 if (conf
->start_next_window
+ NEXT_NORMALIO_DISTANCE
937 conf
->next_window_requests
--;
939 conf
->current_window_requests
--;
941 conf
->current_window_requests
--;
943 if (!conf
->current_window_requests
) {
944 if (conf
->next_window_requests
) {
945 conf
->current_window_requests
=
946 conf
->next_window_requests
;
947 conf
->next_window_requests
= 0;
948 conf
->start_next_window
+=
949 NEXT_NORMALIO_DISTANCE
;
951 conf
->start_next_window
= MaxSector
;
954 spin_unlock_irqrestore(&conf
->resync_lock
, flags
);
955 wake_up(&conf
->wait_barrier
);
958 static void freeze_array(struct r1conf
*conf
, int extra
)
960 /* stop syncio and normal IO and wait for everything to
962 * We wait until nr_pending match nr_queued+extra
963 * This is called in the context of one normal IO request
964 * that has failed. Thus any sync request that might be pending
965 * will be blocked by nr_pending, and we need to wait for
966 * pending IO requests to complete or be queued for re-try.
967 * Thus the number queued (nr_queued) plus this request (extra)
968 * must match the number of pending IOs (nr_pending) before
971 spin_lock_irq(&conf
->resync_lock
);
972 conf
->array_frozen
= 1;
973 raid1_log(conf
->mddev
, "wait freeze");
974 wait_event_lock_irq_cmd(conf
->wait_barrier
,
975 conf
->nr_pending
== conf
->nr_queued
+extra
,
977 flush_pending_writes(conf
));
978 spin_unlock_irq(&conf
->resync_lock
);
980 static void unfreeze_array(struct r1conf
*conf
)
982 /* reverse the effect of the freeze */
983 spin_lock_irq(&conf
->resync_lock
);
984 conf
->array_frozen
= 0;
985 wake_up(&conf
->wait_barrier
);
986 spin_unlock_irq(&conf
->resync_lock
);
989 /* duplicate the data pages for behind I/O
991 static void alloc_behind_pages(struct bio
*bio
, struct r1bio
*r1_bio
)
994 struct bio_vec
*bvec
;
995 struct bio_vec
*bvecs
= kzalloc(bio
->bi_vcnt
* sizeof(struct bio_vec
),
997 if (unlikely(!bvecs
))
1000 bio_for_each_segment_all(bvec
, bio
, i
) {
1002 bvecs
[i
].bv_page
= alloc_page(GFP_NOIO
);
1003 if (unlikely(!bvecs
[i
].bv_page
))
1005 memcpy(kmap(bvecs
[i
].bv_page
) + bvec
->bv_offset
,
1006 kmap(bvec
->bv_page
) + bvec
->bv_offset
, bvec
->bv_len
);
1007 kunmap(bvecs
[i
].bv_page
);
1008 kunmap(bvec
->bv_page
);
1010 r1_bio
->behind_bvecs
= bvecs
;
1011 r1_bio
->behind_page_count
= bio
->bi_vcnt
;
1012 set_bit(R1BIO_BehindIO
, &r1_bio
->state
);
1016 for (i
= 0; i
< bio
->bi_vcnt
; i
++)
1017 if (bvecs
[i
].bv_page
)
1018 put_page(bvecs
[i
].bv_page
);
1020 pr_debug("%dB behind alloc failed, doing sync I/O\n",
1021 bio
->bi_iter
.bi_size
);
1024 struct raid1_plug_cb
{
1025 struct blk_plug_cb cb
;
1026 struct bio_list pending
;
1030 static void raid1_unplug(struct blk_plug_cb
*cb
, bool from_schedule
)
1032 struct raid1_plug_cb
*plug
= container_of(cb
, struct raid1_plug_cb
,
1034 struct mddev
*mddev
= plug
->cb
.data
;
1035 struct r1conf
*conf
= mddev
->private;
1038 if (from_schedule
|| current
->bio_list
) {
1039 spin_lock_irq(&conf
->device_lock
);
1040 bio_list_merge(&conf
->pending_bio_list
, &plug
->pending
);
1041 conf
->pending_count
+= plug
->pending_cnt
;
1042 spin_unlock_irq(&conf
->device_lock
);
1043 wake_up(&conf
->wait_barrier
);
1044 md_wakeup_thread(mddev
->thread
);
1049 /* we aren't scheduling, so we can do the write-out directly. */
1050 bio
= bio_list_get(&plug
->pending
);
1051 bitmap_unplug(mddev
->bitmap
);
1052 wake_up(&conf
->wait_barrier
);
1054 while (bio
) { /* submit pending writes */
1055 struct bio
*next
= bio
->bi_next
;
1056 struct md_rdev
*rdev
= (void*)bio
->bi_bdev
;
1057 bio
->bi_next
= NULL
;
1058 bio
->bi_bdev
= rdev
->bdev
;
1059 if (test_bit(Faulty
, &rdev
->flags
)) {
1060 bio
->bi_error
= -EIO
;
1062 } else if (unlikely((bio_op(bio
) == REQ_OP_DISCARD
) &&
1063 !blk_queue_discard(bdev_get_queue(bio
->bi_bdev
))))
1064 /* Just ignore it */
1067 generic_make_request(bio
);
1073 static void raid1_read_request(struct mddev
*mddev
, struct bio
*bio
,
1074 struct r1bio
*r1_bio
)
1076 struct r1conf
*conf
= mddev
->private;
1077 struct raid1_info
*mirror
;
1078 struct bio
*read_bio
;
1079 struct bitmap
*bitmap
= mddev
->bitmap
;
1080 const int op
= bio_op(bio
);
1081 const unsigned long do_sync
= (bio
->bi_opf
& REQ_SYNC
);
1082 int sectors_handled
;
1086 wait_barrier(conf
, bio
);
1089 rdisk
= read_balance(conf
, r1_bio
, &max_sectors
);
1092 /* couldn't find anywhere to read from */
1093 raid_end_bio_io(r1_bio
);
1096 mirror
= conf
->mirrors
+ rdisk
;
1098 if (test_bit(WriteMostly
, &mirror
->rdev
->flags
) &&
1101 * Reading from a write-mostly device must take care not to
1102 * over-take any writes that are 'behind'
1104 raid1_log(mddev
, "wait behind writes");
1105 wait_event(bitmap
->behind_wait
,
1106 atomic_read(&bitmap
->behind_writes
) == 0);
1108 r1_bio
->read_disk
= rdisk
;
1109 r1_bio
->start_next_window
= 0;
1111 read_bio
= bio_clone_mddev(bio
, GFP_NOIO
, mddev
);
1112 bio_trim(read_bio
, r1_bio
->sector
- bio
->bi_iter
.bi_sector
,
1115 r1_bio
->bios
[rdisk
] = read_bio
;
1117 read_bio
->bi_iter
.bi_sector
= r1_bio
->sector
+
1118 mirror
->rdev
->data_offset
;
1119 read_bio
->bi_bdev
= mirror
->rdev
->bdev
;
1120 read_bio
->bi_end_io
= raid1_end_read_request
;
1121 bio_set_op_attrs(read_bio
, op
, do_sync
);
1122 if (test_bit(FailFast
, &mirror
->rdev
->flags
) &&
1123 test_bit(R1BIO_FailFast
, &r1_bio
->state
))
1124 read_bio
->bi_opf
|= MD_FAILFAST
;
1125 read_bio
->bi_private
= r1_bio
;
1128 trace_block_bio_remap(bdev_get_queue(read_bio
->bi_bdev
),
1129 read_bio
, disk_devt(mddev
->gendisk
),
1132 if (max_sectors
< r1_bio
->sectors
) {
1134 * could not read all from this device, so we will need another
1137 sectors_handled
= (r1_bio
->sector
+ max_sectors
1138 - bio
->bi_iter
.bi_sector
);
1139 r1_bio
->sectors
= max_sectors
;
1140 spin_lock_irq(&conf
->device_lock
);
1141 if (bio
->bi_phys_segments
== 0)
1142 bio
->bi_phys_segments
= 2;
1144 bio
->bi_phys_segments
++;
1145 spin_unlock_irq(&conf
->device_lock
);
1148 * Cannot call generic_make_request directly as that will be
1149 * queued in __make_request and subsequent mempool_alloc might
1150 * block waiting for it. So hand bio over to raid1d.
1152 reschedule_retry(r1_bio
);
1154 r1_bio
= mempool_alloc(conf
->r1bio_pool
, GFP_NOIO
);
1156 r1_bio
->master_bio
= bio
;
1157 r1_bio
->sectors
= bio_sectors(bio
) - sectors_handled
;
1159 r1_bio
->mddev
= mddev
;
1160 r1_bio
->sector
= bio
->bi_iter
.bi_sector
+ sectors_handled
;
1163 generic_make_request(read_bio
);
1166 static void raid1_write_request(struct mddev
*mddev
, struct bio
*bio
,
1167 struct r1bio
*r1_bio
)
1169 struct r1conf
*conf
= mddev
->private;
1171 struct bitmap
*bitmap
= mddev
->bitmap
;
1172 unsigned long flags
;
1173 const int op
= bio_op(bio
);
1174 const unsigned long do_sync
= (bio
->bi_opf
& REQ_SYNC
);
1175 const unsigned long do_flush_fua
= (bio
->bi_opf
&
1176 (REQ_PREFLUSH
| REQ_FUA
));
1177 struct md_rdev
*blocked_rdev
;
1178 struct blk_plug_cb
*cb
;
1179 struct raid1_plug_cb
*plug
= NULL
;
1181 int sectors_handled
;
1183 sector_t start_next_window
;
1186 * Register the new request and wait if the reconstruction
1187 * thread has put up a bar for new requests.
1188 * Continue immediately if no resync is active currently.
1191 md_write_start(mddev
, bio
); /* wait on superblock update early */
1193 if ((bio_end_sector(bio
) > mddev
->suspend_lo
&&
1194 bio
->bi_iter
.bi_sector
< mddev
->suspend_hi
) ||
1195 (mddev_is_clustered(mddev
) &&
1196 md_cluster_ops
->area_resyncing(mddev
, WRITE
,
1197 bio
->bi_iter
.bi_sector
, bio_end_sector(bio
)))) {
1200 * As the suspend_* range is controlled by userspace, we want
1201 * an interruptible wait.
1205 flush_signals(current
);
1206 prepare_to_wait(&conf
->wait_barrier
,
1207 &w
, TASK_INTERRUPTIBLE
);
1208 if (bio_end_sector(bio
) <= mddev
->suspend_lo
||
1209 bio
->bi_iter
.bi_sector
>= mddev
->suspend_hi
||
1210 (mddev_is_clustered(mddev
) &&
1211 !md_cluster_ops
->area_resyncing(mddev
, WRITE
,
1212 bio
->bi_iter
.bi_sector
,
1213 bio_end_sector(bio
))))
1217 finish_wait(&conf
->wait_barrier
, &w
);
1219 start_next_window
= wait_barrier(conf
, bio
);
1221 if (conf
->pending_count
>= max_queued_requests
) {
1222 md_wakeup_thread(mddev
->thread
);
1223 raid1_log(mddev
, "wait queued");
1224 wait_event(conf
->wait_barrier
,
1225 conf
->pending_count
< max_queued_requests
);
1227 /* first select target devices under rcu_lock and
1228 * inc refcount on their rdev. Record them by setting
1230 * If there are known/acknowledged bad blocks on any device on
1231 * which we have seen a write error, we want to avoid writing those
1233 * This potentially requires several writes to write around
1234 * the bad blocks. Each set of writes gets it's own r1bio
1235 * with a set of bios attached.
1238 disks
= conf
->raid_disks
* 2;
1240 r1_bio
->start_next_window
= start_next_window
;
1241 blocked_rdev
= NULL
;
1243 max_sectors
= r1_bio
->sectors
;
1244 for (i
= 0; i
< disks
; i
++) {
1245 struct md_rdev
*rdev
= rcu_dereference(conf
->mirrors
[i
].rdev
);
1246 if (rdev
&& unlikely(test_bit(Blocked
, &rdev
->flags
))) {
1247 atomic_inc(&rdev
->nr_pending
);
1248 blocked_rdev
= rdev
;
1251 r1_bio
->bios
[i
] = NULL
;
1252 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
)) {
1253 if (i
< conf
->raid_disks
)
1254 set_bit(R1BIO_Degraded
, &r1_bio
->state
);
1258 atomic_inc(&rdev
->nr_pending
);
1259 if (test_bit(WriteErrorSeen
, &rdev
->flags
)) {
1264 is_bad
= is_badblock(rdev
, r1_bio
->sector
, max_sectors
,
1265 &first_bad
, &bad_sectors
);
1267 /* mustn't write here until the bad block is
1269 set_bit(BlockedBadBlocks
, &rdev
->flags
);
1270 blocked_rdev
= rdev
;
1273 if (is_bad
&& first_bad
<= r1_bio
->sector
) {
1274 /* Cannot write here at all */
1275 bad_sectors
-= (r1_bio
->sector
- first_bad
);
1276 if (bad_sectors
< max_sectors
)
1277 /* mustn't write more than bad_sectors
1278 * to other devices yet
1280 max_sectors
= bad_sectors
;
1281 rdev_dec_pending(rdev
, mddev
);
1282 /* We don't set R1BIO_Degraded as that
1283 * only applies if the disk is
1284 * missing, so it might be re-added,
1285 * and we want to know to recover this
1287 * In this case the device is here,
1288 * and the fact that this chunk is not
1289 * in-sync is recorded in the bad
1295 int good_sectors
= first_bad
- r1_bio
->sector
;
1296 if (good_sectors
< max_sectors
)
1297 max_sectors
= good_sectors
;
1300 r1_bio
->bios
[i
] = bio
;
1304 if (unlikely(blocked_rdev
)) {
1305 /* Wait for this device to become unblocked */
1307 sector_t old
= start_next_window
;
1309 for (j
= 0; j
< i
; j
++)
1310 if (r1_bio
->bios
[j
])
1311 rdev_dec_pending(conf
->mirrors
[j
].rdev
, mddev
);
1313 allow_barrier(conf
, start_next_window
, bio
->bi_iter
.bi_sector
);
1314 raid1_log(mddev
, "wait rdev %d blocked", blocked_rdev
->raid_disk
);
1315 md_wait_for_blocked_rdev(blocked_rdev
, mddev
);
1316 start_next_window
= wait_barrier(conf
, bio
);
1318 * We must make sure the multi r1bios of bio have
1319 * the same value of bi_phys_segments
1321 if (bio
->bi_phys_segments
&& old
&&
1322 old
!= start_next_window
)
1323 /* Wait for the former r1bio(s) to complete */
1324 wait_event(conf
->wait_barrier
,
1325 bio
->bi_phys_segments
== 1);
1329 if (max_sectors
< r1_bio
->sectors
) {
1330 /* We are splitting this write into multiple parts, so
1331 * we need to prepare for allocating another r1_bio.
1333 r1_bio
->sectors
= max_sectors
;
1334 spin_lock_irq(&conf
->device_lock
);
1335 if (bio
->bi_phys_segments
== 0)
1336 bio
->bi_phys_segments
= 2;
1338 bio
->bi_phys_segments
++;
1339 spin_unlock_irq(&conf
->device_lock
);
1341 sectors_handled
= r1_bio
->sector
+ max_sectors
- bio
->bi_iter
.bi_sector
;
1343 atomic_set(&r1_bio
->remaining
, 1);
1344 atomic_set(&r1_bio
->behind_remaining
, 0);
1347 for (i
= 0; i
< disks
; i
++) {
1349 if (!r1_bio
->bios
[i
])
1352 mbio
= bio_clone_mddev(bio
, GFP_NOIO
, mddev
);
1353 bio_trim(mbio
, r1_bio
->sector
- bio
->bi_iter
.bi_sector
,
1358 * Not if there are too many, or cannot
1359 * allocate memory, or a reader on WriteMostly
1360 * is waiting for behind writes to flush */
1362 (atomic_read(&bitmap
->behind_writes
)
1363 < mddev
->bitmap_info
.max_write_behind
) &&
1364 !waitqueue_active(&bitmap
->behind_wait
))
1365 alloc_behind_pages(mbio
, r1_bio
);
1367 bitmap_startwrite(bitmap
, r1_bio
->sector
,
1369 test_bit(R1BIO_BehindIO
,
1373 if (r1_bio
->behind_bvecs
) {
1374 struct bio_vec
*bvec
;
1378 * We trimmed the bio, so _all is legit
1380 bio_for_each_segment_all(bvec
, mbio
, j
)
1381 bvec
->bv_page
= r1_bio
->behind_bvecs
[j
].bv_page
;
1382 if (test_bit(WriteMostly
, &conf
->mirrors
[i
].rdev
->flags
))
1383 atomic_inc(&r1_bio
->behind_remaining
);
1386 r1_bio
->bios
[i
] = mbio
;
1388 mbio
->bi_iter
.bi_sector
= (r1_bio
->sector
+
1389 conf
->mirrors
[i
].rdev
->data_offset
);
1390 mbio
->bi_bdev
= conf
->mirrors
[i
].rdev
->bdev
;
1391 mbio
->bi_end_io
= raid1_end_write_request
;
1392 bio_set_op_attrs(mbio
, op
, do_flush_fua
| do_sync
);
1393 if (test_bit(FailFast
, &conf
->mirrors
[i
].rdev
->flags
) &&
1394 !test_bit(WriteMostly
, &conf
->mirrors
[i
].rdev
->flags
) &&
1395 conf
->raid_disks
- mddev
->degraded
> 1)
1396 mbio
->bi_opf
|= MD_FAILFAST
;
1397 mbio
->bi_private
= r1_bio
;
1399 atomic_inc(&r1_bio
->remaining
);
1402 trace_block_bio_remap(bdev_get_queue(mbio
->bi_bdev
),
1403 mbio
, disk_devt(mddev
->gendisk
),
1405 /* flush_pending_writes() needs access to the rdev so...*/
1406 mbio
->bi_bdev
= (void*)conf
->mirrors
[i
].rdev
;
1408 cb
= blk_check_plugged(raid1_unplug
, mddev
, sizeof(*plug
));
1410 plug
= container_of(cb
, struct raid1_plug_cb
, cb
);
1413 spin_lock_irqsave(&conf
->device_lock
, flags
);
1415 bio_list_add(&plug
->pending
, mbio
);
1416 plug
->pending_cnt
++;
1418 bio_list_add(&conf
->pending_bio_list
, mbio
);
1419 conf
->pending_count
++;
1421 spin_unlock_irqrestore(&conf
->device_lock
, flags
);
1423 md_wakeup_thread(mddev
->thread
);
1425 /* Mustn't call r1_bio_write_done before this next test,
1426 * as it could result in the bio being freed.
1428 if (sectors_handled
< bio_sectors(bio
)) {
1429 r1_bio_write_done(r1_bio
);
1430 /* We need another r1_bio. It has already been counted
1431 * in bio->bi_phys_segments
1433 r1_bio
= mempool_alloc(conf
->r1bio_pool
, GFP_NOIO
);
1434 r1_bio
->master_bio
= bio
;
1435 r1_bio
->sectors
= bio_sectors(bio
) - sectors_handled
;
1437 r1_bio
->mddev
= mddev
;
1438 r1_bio
->sector
= bio
->bi_iter
.bi_sector
+ sectors_handled
;
1442 r1_bio_write_done(r1_bio
);
1444 /* In case raid1d snuck in to freeze_array */
1445 wake_up(&conf
->wait_barrier
);
1448 static void raid1_make_request(struct mddev
*mddev
, struct bio
*bio
)
1450 struct r1conf
*conf
= mddev
->private;
1451 struct r1bio
*r1_bio
;
1454 * make_request() can abort the operation when read-ahead is being
1455 * used and no empty request is available.
1458 r1_bio
= mempool_alloc(conf
->r1bio_pool
, GFP_NOIO
);
1460 r1_bio
->master_bio
= bio
;
1461 r1_bio
->sectors
= bio_sectors(bio
);
1463 r1_bio
->mddev
= mddev
;
1464 r1_bio
->sector
= bio
->bi_iter
.bi_sector
;
1467 * We might need to issue multiple reads to different devices if there
1468 * are bad blocks around, so we keep track of the number of reads in
1469 * bio->bi_phys_segments. If this is 0, there is only one r1_bio and
1470 * no locking will be needed when requests complete. If it is
1471 * non-zero, then it is the number of not-completed requests.
1473 bio
->bi_phys_segments
= 0;
1474 bio_clear_flag(bio
, BIO_SEG_VALID
);
1476 if (bio_data_dir(bio
) == READ
)
1477 raid1_read_request(mddev
, bio
, r1_bio
);
1479 raid1_write_request(mddev
, bio
, r1_bio
);
1482 static void raid1_status(struct seq_file
*seq
, struct mddev
*mddev
)
1484 struct r1conf
*conf
= mddev
->private;
1487 seq_printf(seq
, " [%d/%d] [", conf
->raid_disks
,
1488 conf
->raid_disks
- mddev
->degraded
);
1490 for (i
= 0; i
< conf
->raid_disks
; i
++) {
1491 struct md_rdev
*rdev
= rcu_dereference(conf
->mirrors
[i
].rdev
);
1492 seq_printf(seq
, "%s",
1493 rdev
&& test_bit(In_sync
, &rdev
->flags
) ? "U" : "_");
1496 seq_printf(seq
, "]");
1499 static void raid1_error(struct mddev
*mddev
, struct md_rdev
*rdev
)
1501 char b
[BDEVNAME_SIZE
];
1502 struct r1conf
*conf
= mddev
->private;
1503 unsigned long flags
;
1506 * If it is not operational, then we have already marked it as dead
1507 * else if it is the last working disks, ignore the error, let the
1508 * next level up know.
1509 * else mark the drive as failed
1511 spin_lock_irqsave(&conf
->device_lock
, flags
);
1512 if (test_bit(In_sync
, &rdev
->flags
)
1513 && (conf
->raid_disks
- mddev
->degraded
) == 1) {
1515 * Don't fail the drive, act as though we were just a
1516 * normal single drive.
1517 * However don't try a recovery from this drive as
1518 * it is very likely to fail.
1520 conf
->recovery_disabled
= mddev
->recovery_disabled
;
1521 spin_unlock_irqrestore(&conf
->device_lock
, flags
);
1524 set_bit(Blocked
, &rdev
->flags
);
1525 if (test_and_clear_bit(In_sync
, &rdev
->flags
)) {
1527 set_bit(Faulty
, &rdev
->flags
);
1529 set_bit(Faulty
, &rdev
->flags
);
1530 spin_unlock_irqrestore(&conf
->device_lock
, flags
);
1532 * if recovery is running, make sure it aborts.
1534 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
1535 set_mask_bits(&mddev
->sb_flags
, 0,
1536 BIT(MD_SB_CHANGE_DEVS
) | BIT(MD_SB_CHANGE_PENDING
));
1537 pr_crit("md/raid1:%s: Disk failure on %s, disabling device.\n"
1538 "md/raid1:%s: Operation continuing on %d devices.\n",
1539 mdname(mddev
), bdevname(rdev
->bdev
, b
),
1540 mdname(mddev
), conf
->raid_disks
- mddev
->degraded
);
1543 static void print_conf(struct r1conf
*conf
)
1547 pr_debug("RAID1 conf printout:\n");
1549 pr_debug("(!conf)\n");
1552 pr_debug(" --- wd:%d rd:%d\n", conf
->raid_disks
- conf
->mddev
->degraded
,
1556 for (i
= 0; i
< conf
->raid_disks
; i
++) {
1557 char b
[BDEVNAME_SIZE
];
1558 struct md_rdev
*rdev
= rcu_dereference(conf
->mirrors
[i
].rdev
);
1560 pr_debug(" disk %d, wo:%d, o:%d, dev:%s\n",
1561 i
, !test_bit(In_sync
, &rdev
->flags
),
1562 !test_bit(Faulty
, &rdev
->flags
),
1563 bdevname(rdev
->bdev
,b
));
1568 static void close_sync(struct r1conf
*conf
)
1570 wait_barrier(conf
, NULL
);
1571 allow_barrier(conf
, 0, 0);
1573 mempool_destroy(conf
->r1buf_pool
);
1574 conf
->r1buf_pool
= NULL
;
1576 spin_lock_irq(&conf
->resync_lock
);
1577 conf
->next_resync
= MaxSector
- 2 * NEXT_NORMALIO_DISTANCE
;
1578 conf
->start_next_window
= MaxSector
;
1579 conf
->current_window_requests
+=
1580 conf
->next_window_requests
;
1581 conf
->next_window_requests
= 0;
1582 spin_unlock_irq(&conf
->resync_lock
);
1585 static int raid1_spare_active(struct mddev
*mddev
)
1588 struct r1conf
*conf
= mddev
->private;
1590 unsigned long flags
;
1593 * Find all failed disks within the RAID1 configuration
1594 * and mark them readable.
1595 * Called under mddev lock, so rcu protection not needed.
1596 * device_lock used to avoid races with raid1_end_read_request
1597 * which expects 'In_sync' flags and ->degraded to be consistent.
1599 spin_lock_irqsave(&conf
->device_lock
, flags
);
1600 for (i
= 0; i
< conf
->raid_disks
; i
++) {
1601 struct md_rdev
*rdev
= conf
->mirrors
[i
].rdev
;
1602 struct md_rdev
*repl
= conf
->mirrors
[conf
->raid_disks
+ i
].rdev
;
1604 && !test_bit(Candidate
, &repl
->flags
)
1605 && repl
->recovery_offset
== MaxSector
1606 && !test_bit(Faulty
, &repl
->flags
)
1607 && !test_and_set_bit(In_sync
, &repl
->flags
)) {
1608 /* replacement has just become active */
1610 !test_and_clear_bit(In_sync
, &rdev
->flags
))
1613 /* Replaced device not technically
1614 * faulty, but we need to be sure
1615 * it gets removed and never re-added
1617 set_bit(Faulty
, &rdev
->flags
);
1618 sysfs_notify_dirent_safe(
1623 && rdev
->recovery_offset
== MaxSector
1624 && !test_bit(Faulty
, &rdev
->flags
)
1625 && !test_and_set_bit(In_sync
, &rdev
->flags
)) {
1627 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
1630 mddev
->degraded
-= count
;
1631 spin_unlock_irqrestore(&conf
->device_lock
, flags
);
1637 static int raid1_add_disk(struct mddev
*mddev
, struct md_rdev
*rdev
)
1639 struct r1conf
*conf
= mddev
->private;
1642 struct raid1_info
*p
;
1644 int last
= conf
->raid_disks
- 1;
1646 if (mddev
->recovery_disabled
== conf
->recovery_disabled
)
1649 if (md_integrity_add_rdev(rdev
, mddev
))
1652 if (rdev
->raid_disk
>= 0)
1653 first
= last
= rdev
->raid_disk
;
1656 * find the disk ... but prefer rdev->saved_raid_disk
1659 if (rdev
->saved_raid_disk
>= 0 &&
1660 rdev
->saved_raid_disk
>= first
&&
1661 conf
->mirrors
[rdev
->saved_raid_disk
].rdev
== NULL
)
1662 first
= last
= rdev
->saved_raid_disk
;
1664 for (mirror
= first
; mirror
<= last
; mirror
++) {
1665 p
= conf
->mirrors
+mirror
;
1669 disk_stack_limits(mddev
->gendisk
, rdev
->bdev
,
1670 rdev
->data_offset
<< 9);
1672 p
->head_position
= 0;
1673 rdev
->raid_disk
= mirror
;
1675 /* As all devices are equivalent, we don't need a full recovery
1676 * if this was recently any drive of the array
1678 if (rdev
->saved_raid_disk
< 0)
1680 rcu_assign_pointer(p
->rdev
, rdev
);
1683 if (test_bit(WantReplacement
, &p
->rdev
->flags
) &&
1684 p
[conf
->raid_disks
].rdev
== NULL
) {
1685 /* Add this device as a replacement */
1686 clear_bit(In_sync
, &rdev
->flags
);
1687 set_bit(Replacement
, &rdev
->flags
);
1688 rdev
->raid_disk
= mirror
;
1691 rcu_assign_pointer(p
[conf
->raid_disks
].rdev
, rdev
);
1695 if (mddev
->queue
&& blk_queue_discard(bdev_get_queue(rdev
->bdev
)))
1696 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD
, mddev
->queue
);
1701 static int raid1_remove_disk(struct mddev
*mddev
, struct md_rdev
*rdev
)
1703 struct r1conf
*conf
= mddev
->private;
1705 int number
= rdev
->raid_disk
;
1706 struct raid1_info
*p
= conf
->mirrors
+ number
;
1708 if (rdev
!= p
->rdev
)
1709 p
= conf
->mirrors
+ conf
->raid_disks
+ number
;
1712 if (rdev
== p
->rdev
) {
1713 if (test_bit(In_sync
, &rdev
->flags
) ||
1714 atomic_read(&rdev
->nr_pending
)) {
1718 /* Only remove non-faulty devices if recovery
1721 if (!test_bit(Faulty
, &rdev
->flags
) &&
1722 mddev
->recovery_disabled
!= conf
->recovery_disabled
&&
1723 mddev
->degraded
< conf
->raid_disks
) {
1728 if (!test_bit(RemoveSynchronized
, &rdev
->flags
)) {
1730 if (atomic_read(&rdev
->nr_pending
)) {
1731 /* lost the race, try later */
1737 if (conf
->mirrors
[conf
->raid_disks
+ number
].rdev
) {
1738 /* We just removed a device that is being replaced.
1739 * Move down the replacement. We drain all IO before
1740 * doing this to avoid confusion.
1742 struct md_rdev
*repl
=
1743 conf
->mirrors
[conf
->raid_disks
+ number
].rdev
;
1744 freeze_array(conf
, 0);
1745 clear_bit(Replacement
, &repl
->flags
);
1747 conf
->mirrors
[conf
->raid_disks
+ number
].rdev
= NULL
;
1748 unfreeze_array(conf
);
1749 clear_bit(WantReplacement
, &rdev
->flags
);
1751 clear_bit(WantReplacement
, &rdev
->flags
);
1752 err
= md_integrity_register(mddev
);
1760 static void end_sync_read(struct bio
*bio
)
1762 struct r1bio
*r1_bio
= bio
->bi_private
;
1764 update_head_pos(r1_bio
->read_disk
, r1_bio
);
1767 * we have read a block, now it needs to be re-written,
1768 * or re-read if the read failed.
1769 * We don't do much here, just schedule handling by raid1d
1772 set_bit(R1BIO_Uptodate
, &r1_bio
->state
);
1774 if (atomic_dec_and_test(&r1_bio
->remaining
))
1775 reschedule_retry(r1_bio
);
1778 static void end_sync_write(struct bio
*bio
)
1780 int uptodate
= !bio
->bi_error
;
1781 struct r1bio
*r1_bio
= bio
->bi_private
;
1782 struct mddev
*mddev
= r1_bio
->mddev
;
1783 struct r1conf
*conf
= mddev
->private;
1786 struct md_rdev
*rdev
= conf
->mirrors
[find_bio_disk(r1_bio
, bio
)].rdev
;
1789 sector_t sync_blocks
= 0;
1790 sector_t s
= r1_bio
->sector
;
1791 long sectors_to_go
= r1_bio
->sectors
;
1792 /* make sure these bits doesn't get cleared. */
1794 bitmap_end_sync(mddev
->bitmap
, s
,
1797 sectors_to_go
-= sync_blocks
;
1798 } while (sectors_to_go
> 0);
1799 set_bit(WriteErrorSeen
, &rdev
->flags
);
1800 if (!test_and_set_bit(WantReplacement
, &rdev
->flags
))
1801 set_bit(MD_RECOVERY_NEEDED
, &
1803 set_bit(R1BIO_WriteError
, &r1_bio
->state
);
1804 } else if (is_badblock(rdev
, r1_bio
->sector
, r1_bio
->sectors
,
1805 &first_bad
, &bad_sectors
) &&
1806 !is_badblock(conf
->mirrors
[r1_bio
->read_disk
].rdev
,
1809 &first_bad
, &bad_sectors
)
1811 set_bit(R1BIO_MadeGood
, &r1_bio
->state
);
1813 if (atomic_dec_and_test(&r1_bio
->remaining
)) {
1814 int s
= r1_bio
->sectors
;
1815 if (test_bit(R1BIO_MadeGood
, &r1_bio
->state
) ||
1816 test_bit(R1BIO_WriteError
, &r1_bio
->state
))
1817 reschedule_retry(r1_bio
);
1820 md_done_sync(mddev
, s
, uptodate
);
1825 static int r1_sync_page_io(struct md_rdev
*rdev
, sector_t sector
,
1826 int sectors
, struct page
*page
, int rw
)
1828 if (sync_page_io(rdev
, sector
, sectors
<< 9, page
, rw
, 0, false))
1832 set_bit(WriteErrorSeen
, &rdev
->flags
);
1833 if (!test_and_set_bit(WantReplacement
,
1835 set_bit(MD_RECOVERY_NEEDED
, &
1836 rdev
->mddev
->recovery
);
1838 /* need to record an error - either for the block or the device */
1839 if (!rdev_set_badblocks(rdev
, sector
, sectors
, 0))
1840 md_error(rdev
->mddev
, rdev
);
1844 static int fix_sync_read_error(struct r1bio
*r1_bio
)
1846 /* Try some synchronous reads of other devices to get
1847 * good data, much like with normal read errors. Only
1848 * read into the pages we already have so we don't
1849 * need to re-issue the read request.
1850 * We don't need to freeze the array, because being in an
1851 * active sync request, there is no normal IO, and
1852 * no overlapping syncs.
1853 * We don't need to check is_badblock() again as we
1854 * made sure that anything with a bad block in range
1855 * will have bi_end_io clear.
1857 struct mddev
*mddev
= r1_bio
->mddev
;
1858 struct r1conf
*conf
= mddev
->private;
1859 struct bio
*bio
= r1_bio
->bios
[r1_bio
->read_disk
];
1860 sector_t sect
= r1_bio
->sector
;
1861 int sectors
= r1_bio
->sectors
;
1863 struct md_rdev
*rdev
;
1865 rdev
= conf
->mirrors
[r1_bio
->read_disk
].rdev
;
1866 if (test_bit(FailFast
, &rdev
->flags
)) {
1867 /* Don't try recovering from here - just fail it
1868 * ... unless it is the last working device of course */
1869 md_error(mddev
, rdev
);
1870 if (test_bit(Faulty
, &rdev
->flags
))
1871 /* Don't try to read from here, but make sure
1872 * put_buf does it's thing
1874 bio
->bi_end_io
= end_sync_write
;
1879 int d
= r1_bio
->read_disk
;
1883 if (s
> (PAGE_SIZE
>>9))
1886 if (r1_bio
->bios
[d
]->bi_end_io
== end_sync_read
) {
1887 /* No rcu protection needed here devices
1888 * can only be removed when no resync is
1889 * active, and resync is currently active
1891 rdev
= conf
->mirrors
[d
].rdev
;
1892 if (sync_page_io(rdev
, sect
, s
<<9,
1893 bio
->bi_io_vec
[idx
].bv_page
,
1894 REQ_OP_READ
, 0, false)) {
1900 if (d
== conf
->raid_disks
* 2)
1902 } while (!success
&& d
!= r1_bio
->read_disk
);
1905 char b
[BDEVNAME_SIZE
];
1907 /* Cannot read from anywhere, this block is lost.
1908 * Record a bad block on each device. If that doesn't
1909 * work just disable and interrupt the recovery.
1910 * Don't fail devices as that won't really help.
1912 pr_crit_ratelimited("md/raid1:%s: %s: unrecoverable I/O read error for block %llu\n",
1914 bdevname(bio
->bi_bdev
, b
),
1915 (unsigned long long)r1_bio
->sector
);
1916 for (d
= 0; d
< conf
->raid_disks
* 2; d
++) {
1917 rdev
= conf
->mirrors
[d
].rdev
;
1918 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
1920 if (!rdev_set_badblocks(rdev
, sect
, s
, 0))
1924 conf
->recovery_disabled
=
1925 mddev
->recovery_disabled
;
1926 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
1927 md_done_sync(mddev
, r1_bio
->sectors
, 0);
1939 /* write it back and re-read */
1940 while (d
!= r1_bio
->read_disk
) {
1942 d
= conf
->raid_disks
* 2;
1944 if (r1_bio
->bios
[d
]->bi_end_io
!= end_sync_read
)
1946 rdev
= conf
->mirrors
[d
].rdev
;
1947 if (r1_sync_page_io(rdev
, sect
, s
,
1948 bio
->bi_io_vec
[idx
].bv_page
,
1950 r1_bio
->bios
[d
]->bi_end_io
= NULL
;
1951 rdev_dec_pending(rdev
, mddev
);
1955 while (d
!= r1_bio
->read_disk
) {
1957 d
= conf
->raid_disks
* 2;
1959 if (r1_bio
->bios
[d
]->bi_end_io
!= end_sync_read
)
1961 rdev
= conf
->mirrors
[d
].rdev
;
1962 if (r1_sync_page_io(rdev
, sect
, s
,
1963 bio
->bi_io_vec
[idx
].bv_page
,
1965 atomic_add(s
, &rdev
->corrected_errors
);
1971 set_bit(R1BIO_Uptodate
, &r1_bio
->state
);
1976 static void process_checks(struct r1bio
*r1_bio
)
1978 /* We have read all readable devices. If we haven't
1979 * got the block, then there is no hope left.
1980 * If we have, then we want to do a comparison
1981 * and skip the write if everything is the same.
1982 * If any blocks failed to read, then we need to
1983 * attempt an over-write
1985 struct mddev
*mddev
= r1_bio
->mddev
;
1986 struct r1conf
*conf
= mddev
->private;
1991 /* Fix variable parts of all bios */
1992 vcnt
= (r1_bio
->sectors
+ PAGE_SIZE
/ 512 - 1) >> (PAGE_SHIFT
- 9);
1993 for (i
= 0; i
< conf
->raid_disks
* 2; i
++) {
1997 struct bio
*b
= r1_bio
->bios
[i
];
1998 if (b
->bi_end_io
!= end_sync_read
)
2000 /* fixup the bio for reuse, but preserve errno */
2001 error
= b
->bi_error
;
2003 b
->bi_error
= error
;
2005 b
->bi_iter
.bi_size
= r1_bio
->sectors
<< 9;
2006 b
->bi_iter
.bi_sector
= r1_bio
->sector
+
2007 conf
->mirrors
[i
].rdev
->data_offset
;
2008 b
->bi_bdev
= conf
->mirrors
[i
].rdev
->bdev
;
2009 b
->bi_end_io
= end_sync_read
;
2010 b
->bi_private
= r1_bio
;
2012 size
= b
->bi_iter
.bi_size
;
2013 for (j
= 0; j
< vcnt
; j
++) {
2015 bi
= &b
->bi_io_vec
[j
];
2017 if (size
> PAGE_SIZE
)
2018 bi
->bv_len
= PAGE_SIZE
;
2024 for (primary
= 0; primary
< conf
->raid_disks
* 2; primary
++)
2025 if (r1_bio
->bios
[primary
]->bi_end_io
== end_sync_read
&&
2026 !r1_bio
->bios
[primary
]->bi_error
) {
2027 r1_bio
->bios
[primary
]->bi_end_io
= NULL
;
2028 rdev_dec_pending(conf
->mirrors
[primary
].rdev
, mddev
);
2031 r1_bio
->read_disk
= primary
;
2032 for (i
= 0; i
< conf
->raid_disks
* 2; i
++) {
2034 struct bio
*pbio
= r1_bio
->bios
[primary
];
2035 struct bio
*sbio
= r1_bio
->bios
[i
];
2036 int error
= sbio
->bi_error
;
2038 if (sbio
->bi_end_io
!= end_sync_read
)
2040 /* Now we can 'fixup' the error value */
2044 for (j
= vcnt
; j
-- ; ) {
2046 p
= pbio
->bi_io_vec
[j
].bv_page
;
2047 s
= sbio
->bi_io_vec
[j
].bv_page
;
2048 if (memcmp(page_address(p
),
2050 sbio
->bi_io_vec
[j
].bv_len
))
2056 atomic64_add(r1_bio
->sectors
, &mddev
->resync_mismatches
);
2057 if (j
< 0 || (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)
2059 /* No need to write to this device. */
2060 sbio
->bi_end_io
= NULL
;
2061 rdev_dec_pending(conf
->mirrors
[i
].rdev
, mddev
);
2065 bio_copy_data(sbio
, pbio
);
2069 static void sync_request_write(struct mddev
*mddev
, struct r1bio
*r1_bio
)
2071 struct r1conf
*conf
= mddev
->private;
2073 int disks
= conf
->raid_disks
* 2;
2074 struct bio
*bio
, *wbio
;
2076 bio
= r1_bio
->bios
[r1_bio
->read_disk
];
2078 if (!test_bit(R1BIO_Uptodate
, &r1_bio
->state
))
2079 /* ouch - failed to read all of that. */
2080 if (!fix_sync_read_error(r1_bio
))
2083 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
2084 process_checks(r1_bio
);
2089 atomic_set(&r1_bio
->remaining
, 1);
2090 for (i
= 0; i
< disks
; i
++) {
2091 wbio
= r1_bio
->bios
[i
];
2092 if (wbio
->bi_end_io
== NULL
||
2093 (wbio
->bi_end_io
== end_sync_read
&&
2094 (i
== r1_bio
->read_disk
||
2095 !test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))))
2098 bio_set_op_attrs(wbio
, REQ_OP_WRITE
, 0);
2099 if (test_bit(FailFast
, &conf
->mirrors
[i
].rdev
->flags
))
2100 wbio
->bi_opf
|= MD_FAILFAST
;
2102 wbio
->bi_end_io
= end_sync_write
;
2103 atomic_inc(&r1_bio
->remaining
);
2104 md_sync_acct(conf
->mirrors
[i
].rdev
->bdev
, bio_sectors(wbio
));
2106 generic_make_request(wbio
);
2109 if (atomic_dec_and_test(&r1_bio
->remaining
)) {
2110 /* if we're here, all write(s) have completed, so clean up */
2111 int s
= r1_bio
->sectors
;
2112 if (test_bit(R1BIO_MadeGood
, &r1_bio
->state
) ||
2113 test_bit(R1BIO_WriteError
, &r1_bio
->state
))
2114 reschedule_retry(r1_bio
);
2117 md_done_sync(mddev
, s
, 1);
2123 * This is a kernel thread which:
2125 * 1. Retries failed read operations on working mirrors.
2126 * 2. Updates the raid superblock when problems encounter.
2127 * 3. Performs writes following reads for array synchronising.
2130 static void fix_read_error(struct r1conf
*conf
, int read_disk
,
2131 sector_t sect
, int sectors
)
2133 struct mddev
*mddev
= conf
->mddev
;
2139 struct md_rdev
*rdev
;
2141 if (s
> (PAGE_SIZE
>>9))
2149 rdev
= rcu_dereference(conf
->mirrors
[d
].rdev
);
2151 (test_bit(In_sync
, &rdev
->flags
) ||
2152 (!test_bit(Faulty
, &rdev
->flags
) &&
2153 rdev
->recovery_offset
>= sect
+ s
)) &&
2154 is_badblock(rdev
, sect
, s
,
2155 &first_bad
, &bad_sectors
) == 0) {
2156 atomic_inc(&rdev
->nr_pending
);
2158 if (sync_page_io(rdev
, sect
, s
<<9,
2159 conf
->tmppage
, REQ_OP_READ
, 0, false))
2161 rdev_dec_pending(rdev
, mddev
);
2167 if (d
== conf
->raid_disks
* 2)
2169 } while (!success
&& d
!= read_disk
);
2172 /* Cannot read from anywhere - mark it bad */
2173 struct md_rdev
*rdev
= conf
->mirrors
[read_disk
].rdev
;
2174 if (!rdev_set_badblocks(rdev
, sect
, s
, 0))
2175 md_error(mddev
, rdev
);
2178 /* write it back and re-read */
2180 while (d
!= read_disk
) {
2182 d
= conf
->raid_disks
* 2;
2185 rdev
= rcu_dereference(conf
->mirrors
[d
].rdev
);
2187 !test_bit(Faulty
, &rdev
->flags
)) {
2188 atomic_inc(&rdev
->nr_pending
);
2190 r1_sync_page_io(rdev
, sect
, s
,
2191 conf
->tmppage
, WRITE
);
2192 rdev_dec_pending(rdev
, mddev
);
2197 while (d
!= read_disk
) {
2198 char b
[BDEVNAME_SIZE
];
2200 d
= conf
->raid_disks
* 2;
2203 rdev
= rcu_dereference(conf
->mirrors
[d
].rdev
);
2205 !test_bit(Faulty
, &rdev
->flags
)) {
2206 atomic_inc(&rdev
->nr_pending
);
2208 if (r1_sync_page_io(rdev
, sect
, s
,
2209 conf
->tmppage
, READ
)) {
2210 atomic_add(s
, &rdev
->corrected_errors
);
2211 pr_info("md/raid1:%s: read error corrected (%d sectors at %llu on %s)\n",
2213 (unsigned long long)(sect
+
2215 bdevname(rdev
->bdev
, b
));
2217 rdev_dec_pending(rdev
, mddev
);
2226 static int narrow_write_error(struct r1bio
*r1_bio
, int i
)
2228 struct mddev
*mddev
= r1_bio
->mddev
;
2229 struct r1conf
*conf
= mddev
->private;
2230 struct md_rdev
*rdev
= conf
->mirrors
[i
].rdev
;
2232 /* bio has the data to be written to device 'i' where
2233 * we just recently had a write error.
2234 * We repeatedly clone the bio and trim down to one block,
2235 * then try the write. Where the write fails we record
2237 * It is conceivable that the bio doesn't exactly align with
2238 * blocks. We must handle this somehow.
2240 * We currently own a reference on the rdev.
2246 int sect_to_write
= r1_bio
->sectors
;
2249 if (rdev
->badblocks
.shift
< 0)
2252 block_sectors
= roundup(1 << rdev
->badblocks
.shift
,
2253 bdev_logical_block_size(rdev
->bdev
) >> 9);
2254 sector
= r1_bio
->sector
;
2255 sectors
= ((sector
+ block_sectors
)
2256 & ~(sector_t
)(block_sectors
- 1))
2259 while (sect_to_write
) {
2261 if (sectors
> sect_to_write
)
2262 sectors
= sect_to_write
;
2263 /* Write at 'sector' for 'sectors'*/
2265 if (test_bit(R1BIO_BehindIO
, &r1_bio
->state
)) {
2266 unsigned vcnt
= r1_bio
->behind_page_count
;
2267 struct bio_vec
*vec
= r1_bio
->behind_bvecs
;
2269 while (!vec
->bv_page
) {
2274 wbio
= bio_alloc_mddev(GFP_NOIO
, vcnt
, mddev
);
2275 memcpy(wbio
->bi_io_vec
, vec
, vcnt
* sizeof(struct bio_vec
));
2277 wbio
->bi_vcnt
= vcnt
;
2279 wbio
= bio_clone_mddev(r1_bio
->master_bio
, GFP_NOIO
, mddev
);
2282 bio_set_op_attrs(wbio
, REQ_OP_WRITE
, 0);
2283 wbio
->bi_iter
.bi_sector
= r1_bio
->sector
;
2284 wbio
->bi_iter
.bi_size
= r1_bio
->sectors
<< 9;
2286 bio_trim(wbio
, sector
- r1_bio
->sector
, sectors
);
2287 wbio
->bi_iter
.bi_sector
+= rdev
->data_offset
;
2288 wbio
->bi_bdev
= rdev
->bdev
;
2290 if (submit_bio_wait(wbio
) < 0)
2292 ok
= rdev_set_badblocks(rdev
, sector
,
2297 sect_to_write
-= sectors
;
2299 sectors
= block_sectors
;
2304 static void handle_sync_write_finished(struct r1conf
*conf
, struct r1bio
*r1_bio
)
2307 int s
= r1_bio
->sectors
;
2308 for (m
= 0; m
< conf
->raid_disks
* 2 ; m
++) {
2309 struct md_rdev
*rdev
= conf
->mirrors
[m
].rdev
;
2310 struct bio
*bio
= r1_bio
->bios
[m
];
2311 if (bio
->bi_end_io
== NULL
)
2313 if (!bio
->bi_error
&&
2314 test_bit(R1BIO_MadeGood
, &r1_bio
->state
)) {
2315 rdev_clear_badblocks(rdev
, r1_bio
->sector
, s
, 0);
2317 if (bio
->bi_error
&&
2318 test_bit(R1BIO_WriteError
, &r1_bio
->state
)) {
2319 if (!rdev_set_badblocks(rdev
, r1_bio
->sector
, s
, 0))
2320 md_error(conf
->mddev
, rdev
);
2324 md_done_sync(conf
->mddev
, s
, 1);
2327 static void handle_write_finished(struct r1conf
*conf
, struct r1bio
*r1_bio
)
2331 for (m
= 0; m
< conf
->raid_disks
* 2 ; m
++)
2332 if (r1_bio
->bios
[m
] == IO_MADE_GOOD
) {
2333 struct md_rdev
*rdev
= conf
->mirrors
[m
].rdev
;
2334 rdev_clear_badblocks(rdev
,
2336 r1_bio
->sectors
, 0);
2337 rdev_dec_pending(rdev
, conf
->mddev
);
2338 } else if (r1_bio
->bios
[m
] != NULL
) {
2339 /* This drive got a write error. We need to
2340 * narrow down and record precise write
2344 if (!narrow_write_error(r1_bio
, m
)) {
2345 md_error(conf
->mddev
,
2346 conf
->mirrors
[m
].rdev
);
2347 /* an I/O failed, we can't clear the bitmap */
2348 set_bit(R1BIO_Degraded
, &r1_bio
->state
);
2350 rdev_dec_pending(conf
->mirrors
[m
].rdev
,
2354 spin_lock_irq(&conf
->device_lock
);
2355 list_add(&r1_bio
->retry_list
, &conf
->bio_end_io_list
);
2357 spin_unlock_irq(&conf
->device_lock
);
2358 md_wakeup_thread(conf
->mddev
->thread
);
2360 if (test_bit(R1BIO_WriteError
, &r1_bio
->state
))
2361 close_write(r1_bio
);
2362 raid_end_bio_io(r1_bio
);
2366 static void handle_read_error(struct r1conf
*conf
, struct r1bio
*r1_bio
)
2370 struct mddev
*mddev
= conf
->mddev
;
2372 char b
[BDEVNAME_SIZE
];
2373 struct md_rdev
*rdev
;
2375 sector_t bio_sector
;
2377 clear_bit(R1BIO_ReadError
, &r1_bio
->state
);
2378 /* we got a read error. Maybe the drive is bad. Maybe just
2379 * the block and we can fix it.
2380 * We freeze all other IO, and try reading the block from
2381 * other devices. When we find one, we re-write
2382 * and check it that fixes the read error.
2383 * This is all done synchronously while the array is
2387 bio
= r1_bio
->bios
[r1_bio
->read_disk
];
2388 bdevname(bio
->bi_bdev
, b
);
2389 bio_dev
= bio
->bi_bdev
->bd_dev
;
2390 bio_sector
= conf
->mirrors
[r1_bio
->read_disk
].rdev
->data_offset
+ r1_bio
->sector
;
2392 r1_bio
->bios
[r1_bio
->read_disk
] = NULL
;
2394 rdev
= conf
->mirrors
[r1_bio
->read_disk
].rdev
;
2396 && !test_bit(FailFast
, &rdev
->flags
)) {
2397 freeze_array(conf
, 1);
2398 fix_read_error(conf
, r1_bio
->read_disk
,
2399 r1_bio
->sector
, r1_bio
->sectors
);
2400 unfreeze_array(conf
);
2402 r1_bio
->bios
[r1_bio
->read_disk
] = IO_BLOCKED
;
2405 rdev_dec_pending(rdev
, conf
->mddev
);
2408 disk
= read_balance(conf
, r1_bio
, &max_sectors
);
2410 pr_crit_ratelimited("md/raid1:%s: %s: unrecoverable I/O read error for block %llu\n",
2411 mdname(mddev
), b
, (unsigned long long)r1_bio
->sector
);
2412 raid_end_bio_io(r1_bio
);
2414 const unsigned long do_sync
2415 = r1_bio
->master_bio
->bi_opf
& REQ_SYNC
;
2416 r1_bio
->read_disk
= disk
;
2417 bio
= bio_clone_mddev(r1_bio
->master_bio
, GFP_NOIO
, mddev
);
2418 bio_trim(bio
, r1_bio
->sector
- bio
->bi_iter
.bi_sector
,
2420 r1_bio
->bios
[r1_bio
->read_disk
] = bio
;
2421 rdev
= conf
->mirrors
[disk
].rdev
;
2422 pr_info_ratelimited("md/raid1:%s: redirecting sector %llu to other mirror: %s\n",
2424 (unsigned long long)r1_bio
->sector
,
2425 bdevname(rdev
->bdev
, b
));
2426 bio
->bi_iter
.bi_sector
= r1_bio
->sector
+ rdev
->data_offset
;
2427 bio
->bi_bdev
= rdev
->bdev
;
2428 bio
->bi_end_io
= raid1_end_read_request
;
2429 bio_set_op_attrs(bio
, REQ_OP_READ
, do_sync
);
2430 if (test_bit(FailFast
, &rdev
->flags
) &&
2431 test_bit(R1BIO_FailFast
, &r1_bio
->state
))
2432 bio
->bi_opf
|= MD_FAILFAST
;
2433 bio
->bi_private
= r1_bio
;
2434 if (max_sectors
< r1_bio
->sectors
) {
2435 /* Drat - have to split this up more */
2436 struct bio
*mbio
= r1_bio
->master_bio
;
2437 int sectors_handled
= (r1_bio
->sector
+ max_sectors
2438 - mbio
->bi_iter
.bi_sector
);
2439 r1_bio
->sectors
= max_sectors
;
2440 spin_lock_irq(&conf
->device_lock
);
2441 if (mbio
->bi_phys_segments
== 0)
2442 mbio
->bi_phys_segments
= 2;
2444 mbio
->bi_phys_segments
++;
2445 spin_unlock_irq(&conf
->device_lock
);
2446 trace_block_bio_remap(bdev_get_queue(bio
->bi_bdev
),
2447 bio
, bio_dev
, bio_sector
);
2448 generic_make_request(bio
);
2451 r1_bio
= mempool_alloc(conf
->r1bio_pool
, GFP_NOIO
);
2453 r1_bio
->master_bio
= mbio
;
2454 r1_bio
->sectors
= bio_sectors(mbio
) - sectors_handled
;
2456 set_bit(R1BIO_ReadError
, &r1_bio
->state
);
2457 r1_bio
->mddev
= mddev
;
2458 r1_bio
->sector
= mbio
->bi_iter
.bi_sector
+
2463 trace_block_bio_remap(bdev_get_queue(bio
->bi_bdev
),
2464 bio
, bio_dev
, bio_sector
);
2465 generic_make_request(bio
);
2470 static void raid1d(struct md_thread
*thread
)
2472 struct mddev
*mddev
= thread
->mddev
;
2473 struct r1bio
*r1_bio
;
2474 unsigned long flags
;
2475 struct r1conf
*conf
= mddev
->private;
2476 struct list_head
*head
= &conf
->retry_list
;
2477 struct blk_plug plug
;
2479 md_check_recovery(mddev
);
2481 if (!list_empty_careful(&conf
->bio_end_io_list
) &&
2482 !test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
)) {
2484 spin_lock_irqsave(&conf
->device_lock
, flags
);
2485 if (!test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
)) {
2486 while (!list_empty(&conf
->bio_end_io_list
)) {
2487 list_move(conf
->bio_end_io_list
.prev
, &tmp
);
2491 spin_unlock_irqrestore(&conf
->device_lock
, flags
);
2492 while (!list_empty(&tmp
)) {
2493 r1_bio
= list_first_entry(&tmp
, struct r1bio
,
2495 list_del(&r1_bio
->retry_list
);
2496 if (mddev
->degraded
)
2497 set_bit(R1BIO_Degraded
, &r1_bio
->state
);
2498 if (test_bit(R1BIO_WriteError
, &r1_bio
->state
))
2499 close_write(r1_bio
);
2500 raid_end_bio_io(r1_bio
);
2504 blk_start_plug(&plug
);
2507 flush_pending_writes(conf
);
2509 spin_lock_irqsave(&conf
->device_lock
, flags
);
2510 if (list_empty(head
)) {
2511 spin_unlock_irqrestore(&conf
->device_lock
, flags
);
2514 r1_bio
= list_entry(head
->prev
, struct r1bio
, retry_list
);
2515 list_del(head
->prev
);
2517 spin_unlock_irqrestore(&conf
->device_lock
, flags
);
2519 mddev
= r1_bio
->mddev
;
2520 conf
= mddev
->private;
2521 if (test_bit(R1BIO_IsSync
, &r1_bio
->state
)) {
2522 if (test_bit(R1BIO_MadeGood
, &r1_bio
->state
) ||
2523 test_bit(R1BIO_WriteError
, &r1_bio
->state
))
2524 handle_sync_write_finished(conf
, r1_bio
);
2526 sync_request_write(mddev
, r1_bio
);
2527 } else if (test_bit(R1BIO_MadeGood
, &r1_bio
->state
) ||
2528 test_bit(R1BIO_WriteError
, &r1_bio
->state
))
2529 handle_write_finished(conf
, r1_bio
);
2530 else if (test_bit(R1BIO_ReadError
, &r1_bio
->state
))
2531 handle_read_error(conf
, r1_bio
);
2533 /* just a partial read to be scheduled from separate
2536 generic_make_request(r1_bio
->bios
[r1_bio
->read_disk
]);
2539 if (mddev
->sb_flags
& ~(1<<MD_SB_CHANGE_PENDING
))
2540 md_check_recovery(mddev
);
2542 blk_finish_plug(&plug
);
2545 static int init_resync(struct r1conf
*conf
)
2549 buffs
= RESYNC_WINDOW
/ RESYNC_BLOCK_SIZE
;
2550 BUG_ON(conf
->r1buf_pool
);
2551 conf
->r1buf_pool
= mempool_create(buffs
, r1buf_pool_alloc
, r1buf_pool_free
,
2553 if (!conf
->r1buf_pool
)
2555 conf
->next_resync
= 0;
2560 * perform a "sync" on one "block"
2562 * We need to make sure that no normal I/O request - particularly write
2563 * requests - conflict with active sync requests.
2565 * This is achieved by tracking pending requests and a 'barrier' concept
2566 * that can be installed to exclude normal IO requests.
2569 static sector_t
raid1_sync_request(struct mddev
*mddev
, sector_t sector_nr
,
2572 struct r1conf
*conf
= mddev
->private;
2573 struct r1bio
*r1_bio
;
2575 sector_t max_sector
, nr_sectors
;
2579 int write_targets
= 0, read_targets
= 0;
2580 sector_t sync_blocks
;
2581 int still_degraded
= 0;
2582 int good_sectors
= RESYNC_SECTORS
;
2583 int min_bad
= 0; /* number of sectors that are bad in all devices */
2585 if (!conf
->r1buf_pool
)
2586 if (init_resync(conf
))
2589 max_sector
= mddev
->dev_sectors
;
2590 if (sector_nr
>= max_sector
) {
2591 /* If we aborted, we need to abort the
2592 * sync on the 'current' bitmap chunk (there will
2593 * only be one in raid1 resync.
2594 * We can find the current addess in mddev->curr_resync
2596 if (mddev
->curr_resync
< max_sector
) /* aborted */
2597 bitmap_end_sync(mddev
->bitmap
, mddev
->curr_resync
,
2599 else /* completed sync */
2602 bitmap_close_sync(mddev
->bitmap
);
2605 if (mddev_is_clustered(mddev
)) {
2606 conf
->cluster_sync_low
= 0;
2607 conf
->cluster_sync_high
= 0;
2612 if (mddev
->bitmap
== NULL
&&
2613 mddev
->recovery_cp
== MaxSector
&&
2614 !test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
) &&
2615 conf
->fullsync
== 0) {
2617 return max_sector
- sector_nr
;
2619 /* before building a request, check if we can skip these blocks..
2620 * This call the bitmap_start_sync doesn't actually record anything
2622 if (!bitmap_start_sync(mddev
->bitmap
, sector_nr
, &sync_blocks
, 1) &&
2623 !conf
->fullsync
&& !test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
2624 /* We can skip this block, and probably several more */
2630 * If there is non-resync activity waiting for a turn, then let it
2631 * though before starting on this new sync request.
2633 if (conf
->nr_waiting
)
2634 schedule_timeout_uninterruptible(1);
2636 /* we are incrementing sector_nr below. To be safe, we check against
2637 * sector_nr + two times RESYNC_SECTORS
2640 bitmap_cond_end_sync(mddev
->bitmap
, sector_nr
,
2641 mddev_is_clustered(mddev
) && (sector_nr
+ 2 * RESYNC_SECTORS
> conf
->cluster_sync_high
));
2642 r1_bio
= mempool_alloc(conf
->r1buf_pool
, GFP_NOIO
);
2644 raise_barrier(conf
, sector_nr
);
2648 * If we get a correctably read error during resync or recovery,
2649 * we might want to read from a different device. So we
2650 * flag all drives that could conceivably be read from for READ,
2651 * and any others (which will be non-In_sync devices) for WRITE.
2652 * If a read fails, we try reading from something else for which READ
2656 r1_bio
->mddev
= mddev
;
2657 r1_bio
->sector
= sector_nr
;
2659 set_bit(R1BIO_IsSync
, &r1_bio
->state
);
2661 for (i
= 0; i
< conf
->raid_disks
* 2; i
++) {
2662 struct md_rdev
*rdev
;
2663 bio
= r1_bio
->bios
[i
];
2666 rdev
= rcu_dereference(conf
->mirrors
[i
].rdev
);
2668 test_bit(Faulty
, &rdev
->flags
)) {
2669 if (i
< conf
->raid_disks
)
2671 } else if (!test_bit(In_sync
, &rdev
->flags
)) {
2672 bio_set_op_attrs(bio
, REQ_OP_WRITE
, 0);
2673 bio
->bi_end_io
= end_sync_write
;
2676 /* may need to read from here */
2677 sector_t first_bad
= MaxSector
;
2680 if (is_badblock(rdev
, sector_nr
, good_sectors
,
2681 &first_bad
, &bad_sectors
)) {
2682 if (first_bad
> sector_nr
)
2683 good_sectors
= first_bad
- sector_nr
;
2685 bad_sectors
-= (sector_nr
- first_bad
);
2687 min_bad
> bad_sectors
)
2688 min_bad
= bad_sectors
;
2691 if (sector_nr
< first_bad
) {
2692 if (test_bit(WriteMostly
, &rdev
->flags
)) {
2699 bio_set_op_attrs(bio
, REQ_OP_READ
, 0);
2700 bio
->bi_end_io
= end_sync_read
;
2702 } else if (!test_bit(WriteErrorSeen
, &rdev
->flags
) &&
2703 test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) &&
2704 !test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)) {
2706 * The device is suitable for reading (InSync),
2707 * but has bad block(s) here. Let's try to correct them,
2708 * if we are doing resync or repair. Otherwise, leave
2709 * this device alone for this sync request.
2711 bio_set_op_attrs(bio
, REQ_OP_WRITE
, 0);
2712 bio
->bi_end_io
= end_sync_write
;
2716 if (bio
->bi_end_io
) {
2717 atomic_inc(&rdev
->nr_pending
);
2718 bio
->bi_iter
.bi_sector
= sector_nr
+ rdev
->data_offset
;
2719 bio
->bi_bdev
= rdev
->bdev
;
2720 bio
->bi_private
= r1_bio
;
2721 if (test_bit(FailFast
, &rdev
->flags
))
2722 bio
->bi_opf
|= MD_FAILFAST
;
2728 r1_bio
->read_disk
= disk
;
2730 if (read_targets
== 0 && min_bad
> 0) {
2731 /* These sectors are bad on all InSync devices, so we
2732 * need to mark them bad on all write targets
2735 for (i
= 0 ; i
< conf
->raid_disks
* 2 ; i
++)
2736 if (r1_bio
->bios
[i
]->bi_end_io
== end_sync_write
) {
2737 struct md_rdev
*rdev
= conf
->mirrors
[i
].rdev
;
2738 ok
= rdev_set_badblocks(rdev
, sector_nr
,
2742 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
2747 /* Cannot record the badblocks, so need to
2749 * If there are multiple read targets, could just
2750 * fail the really bad ones ???
2752 conf
->recovery_disabled
= mddev
->recovery_disabled
;
2753 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
2759 if (min_bad
> 0 && min_bad
< good_sectors
) {
2760 /* only resync enough to reach the next bad->good
2762 good_sectors
= min_bad
;
2765 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) && read_targets
> 0)
2766 /* extra read targets are also write targets */
2767 write_targets
+= read_targets
-1;
2769 if (write_targets
== 0 || read_targets
== 0) {
2770 /* There is nowhere to write, so all non-sync
2771 * drives must be failed - so we are finished
2775 max_sector
= sector_nr
+ min_bad
;
2776 rv
= max_sector
- sector_nr
;
2782 if (max_sector
> mddev
->resync_max
)
2783 max_sector
= mddev
->resync_max
; /* Don't do IO beyond here */
2784 if (max_sector
> sector_nr
+ good_sectors
)
2785 max_sector
= sector_nr
+ good_sectors
;
2790 int len
= PAGE_SIZE
;
2791 if (sector_nr
+ (len
>>9) > max_sector
)
2792 len
= (max_sector
- sector_nr
) << 9;
2795 if (sync_blocks
== 0) {
2796 if (!bitmap_start_sync(mddev
->bitmap
, sector_nr
,
2797 &sync_blocks
, still_degraded
) &&
2799 !test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
2801 if ((len
>> 9) > sync_blocks
)
2802 len
= sync_blocks
<<9;
2805 for (i
= 0 ; i
< conf
->raid_disks
* 2; i
++) {
2806 bio
= r1_bio
->bios
[i
];
2807 if (bio
->bi_end_io
) {
2808 page
= bio
->bi_io_vec
[bio
->bi_vcnt
].bv_page
;
2809 if (bio_add_page(bio
, page
, len
, 0) == 0) {
2811 bio
->bi_io_vec
[bio
->bi_vcnt
].bv_page
= page
;
2814 bio
= r1_bio
->bios
[i
];
2815 if (bio
->bi_end_io
==NULL
)
2817 /* remove last page from this bio */
2819 bio
->bi_iter
.bi_size
-= len
;
2820 bio_clear_flag(bio
, BIO_SEG_VALID
);
2826 nr_sectors
+= len
>>9;
2827 sector_nr
+= len
>>9;
2828 sync_blocks
-= (len
>>9);
2829 } while (r1_bio
->bios
[disk
]->bi_vcnt
< RESYNC_PAGES
);
2831 r1_bio
->sectors
= nr_sectors
;
2833 if (mddev_is_clustered(mddev
) &&
2834 conf
->cluster_sync_high
< sector_nr
+ nr_sectors
) {
2835 conf
->cluster_sync_low
= mddev
->curr_resync_completed
;
2836 conf
->cluster_sync_high
= conf
->cluster_sync_low
+ CLUSTER_RESYNC_WINDOW_SECTORS
;
2837 /* Send resync message */
2838 md_cluster_ops
->resync_info_update(mddev
,
2839 conf
->cluster_sync_low
,
2840 conf
->cluster_sync_high
);
2843 /* For a user-requested sync, we read all readable devices and do a
2846 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
2847 atomic_set(&r1_bio
->remaining
, read_targets
);
2848 for (i
= 0; i
< conf
->raid_disks
* 2 && read_targets
; i
++) {
2849 bio
= r1_bio
->bios
[i
];
2850 if (bio
->bi_end_io
== end_sync_read
) {
2852 md_sync_acct(bio
->bi_bdev
, nr_sectors
);
2853 if (read_targets
== 1)
2854 bio
->bi_opf
&= ~MD_FAILFAST
;
2855 generic_make_request(bio
);
2859 atomic_set(&r1_bio
->remaining
, 1);
2860 bio
= r1_bio
->bios
[r1_bio
->read_disk
];
2861 md_sync_acct(bio
->bi_bdev
, nr_sectors
);
2862 if (read_targets
== 1)
2863 bio
->bi_opf
&= ~MD_FAILFAST
;
2864 generic_make_request(bio
);
2870 static sector_t
raid1_size(struct mddev
*mddev
, sector_t sectors
, int raid_disks
)
2875 return mddev
->dev_sectors
;
2878 static struct r1conf
*setup_conf(struct mddev
*mddev
)
2880 struct r1conf
*conf
;
2882 struct raid1_info
*disk
;
2883 struct md_rdev
*rdev
;
2886 conf
= kzalloc(sizeof(struct r1conf
), GFP_KERNEL
);
2890 conf
->mirrors
= kzalloc(sizeof(struct raid1_info
)
2891 * mddev
->raid_disks
* 2,
2896 conf
->tmppage
= alloc_page(GFP_KERNEL
);
2900 conf
->poolinfo
= kzalloc(sizeof(*conf
->poolinfo
), GFP_KERNEL
);
2901 if (!conf
->poolinfo
)
2903 conf
->poolinfo
->raid_disks
= mddev
->raid_disks
* 2;
2904 conf
->r1bio_pool
= mempool_create(NR_RAID1_BIOS
, r1bio_pool_alloc
,
2907 if (!conf
->r1bio_pool
)
2910 conf
->poolinfo
->mddev
= mddev
;
2913 spin_lock_init(&conf
->device_lock
);
2914 rdev_for_each(rdev
, mddev
) {
2915 struct request_queue
*q
;
2916 int disk_idx
= rdev
->raid_disk
;
2917 if (disk_idx
>= mddev
->raid_disks
2920 if (test_bit(Replacement
, &rdev
->flags
))
2921 disk
= conf
->mirrors
+ mddev
->raid_disks
+ disk_idx
;
2923 disk
= conf
->mirrors
+ disk_idx
;
2928 q
= bdev_get_queue(rdev
->bdev
);
2930 disk
->head_position
= 0;
2931 disk
->seq_start
= MaxSector
;
2933 conf
->raid_disks
= mddev
->raid_disks
;
2934 conf
->mddev
= mddev
;
2935 INIT_LIST_HEAD(&conf
->retry_list
);
2936 INIT_LIST_HEAD(&conf
->bio_end_io_list
);
2938 spin_lock_init(&conf
->resync_lock
);
2939 init_waitqueue_head(&conf
->wait_barrier
);
2941 bio_list_init(&conf
->pending_bio_list
);
2942 conf
->pending_count
= 0;
2943 conf
->recovery_disabled
= mddev
->recovery_disabled
- 1;
2945 conf
->start_next_window
= MaxSector
;
2946 conf
->current_window_requests
= conf
->next_window_requests
= 0;
2949 for (i
= 0; i
< conf
->raid_disks
* 2; i
++) {
2951 disk
= conf
->mirrors
+ i
;
2953 if (i
< conf
->raid_disks
&&
2954 disk
[conf
->raid_disks
].rdev
) {
2955 /* This slot has a replacement. */
2957 /* No original, just make the replacement
2958 * a recovering spare
2961 disk
[conf
->raid_disks
].rdev
;
2962 disk
[conf
->raid_disks
].rdev
= NULL
;
2963 } else if (!test_bit(In_sync
, &disk
->rdev
->flags
))
2964 /* Original is not in_sync - bad */
2969 !test_bit(In_sync
, &disk
->rdev
->flags
)) {
2970 disk
->head_position
= 0;
2972 (disk
->rdev
->saved_raid_disk
< 0))
2978 conf
->thread
= md_register_thread(raid1d
, mddev
, "raid1");
2986 mempool_destroy(conf
->r1bio_pool
);
2987 kfree(conf
->mirrors
);
2988 safe_put_page(conf
->tmppage
);
2989 kfree(conf
->poolinfo
);
2992 return ERR_PTR(err
);
2995 static void raid1_free(struct mddev
*mddev
, void *priv
);
2996 static int raid1_run(struct mddev
*mddev
)
2998 struct r1conf
*conf
;
3000 struct md_rdev
*rdev
;
3002 bool discard_supported
= false;
3004 if (mddev
->level
!= 1) {
3005 pr_warn("md/raid1:%s: raid level not set to mirroring (%d)\n",
3006 mdname(mddev
), mddev
->level
);
3009 if (mddev
->reshape_position
!= MaxSector
) {
3010 pr_warn("md/raid1:%s: reshape_position set but not supported\n",
3015 * copy the already verified devices into our private RAID1
3016 * bookkeeping area. [whatever we allocate in run(),
3017 * should be freed in raid1_free()]
3019 if (mddev
->private == NULL
)
3020 conf
= setup_conf(mddev
);
3022 conf
= mddev
->private;
3025 return PTR_ERR(conf
);
3028 blk_queue_max_write_same_sectors(mddev
->queue
, 0);
3030 rdev_for_each(rdev
, mddev
) {
3031 if (!mddev
->gendisk
)
3033 disk_stack_limits(mddev
->gendisk
, rdev
->bdev
,
3034 rdev
->data_offset
<< 9);
3035 if (blk_queue_discard(bdev_get_queue(rdev
->bdev
)))
3036 discard_supported
= true;
3039 mddev
->degraded
= 0;
3040 for (i
=0; i
< conf
->raid_disks
; i
++)
3041 if (conf
->mirrors
[i
].rdev
== NULL
||
3042 !test_bit(In_sync
, &conf
->mirrors
[i
].rdev
->flags
) ||
3043 test_bit(Faulty
, &conf
->mirrors
[i
].rdev
->flags
))
3046 if (conf
->raid_disks
- mddev
->degraded
== 1)
3047 mddev
->recovery_cp
= MaxSector
;
3049 if (mddev
->recovery_cp
!= MaxSector
)
3050 pr_info("md/raid1:%s: not clean -- starting background reconstruction\n",
3052 pr_info("md/raid1:%s: active with %d out of %d mirrors\n",
3053 mdname(mddev
), mddev
->raid_disks
- mddev
->degraded
,
3057 * Ok, everything is just fine now
3059 mddev
->thread
= conf
->thread
;
3060 conf
->thread
= NULL
;
3061 mddev
->private = conf
;
3062 set_bit(MD_FAILFAST_SUPPORTED
, &mddev
->flags
);
3064 md_set_array_sectors(mddev
, raid1_size(mddev
, 0, 0));
3067 if (discard_supported
)
3068 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD
,
3071 queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD
,
3075 ret
= md_integrity_register(mddev
);
3077 md_unregister_thread(&mddev
->thread
);
3078 raid1_free(mddev
, conf
);
3083 static void raid1_free(struct mddev
*mddev
, void *priv
)
3085 struct r1conf
*conf
= priv
;
3087 mempool_destroy(conf
->r1bio_pool
);
3088 kfree(conf
->mirrors
);
3089 safe_put_page(conf
->tmppage
);
3090 kfree(conf
->poolinfo
);
3094 static int raid1_resize(struct mddev
*mddev
, sector_t sectors
)
3096 /* no resync is happening, and there is enough space
3097 * on all devices, so we can resize.
3098 * We need to make sure resync covers any new space.
3099 * If the array is shrinking we should possibly wait until
3100 * any io in the removed space completes, but it hardly seems
3103 sector_t newsize
= raid1_size(mddev
, sectors
, 0);
3104 if (mddev
->external_size
&&
3105 mddev
->array_sectors
> newsize
)
3107 if (mddev
->bitmap
) {
3108 int ret
= bitmap_resize(mddev
->bitmap
, newsize
, 0, 0);
3112 md_set_array_sectors(mddev
, newsize
);
3113 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
3114 revalidate_disk(mddev
->gendisk
);
3115 if (sectors
> mddev
->dev_sectors
&&
3116 mddev
->recovery_cp
> mddev
->dev_sectors
) {
3117 mddev
->recovery_cp
= mddev
->dev_sectors
;
3118 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3120 mddev
->dev_sectors
= sectors
;
3121 mddev
->resync_max_sectors
= sectors
;
3125 static int raid1_reshape(struct mddev
*mddev
)
3128 * 1/ resize the r1bio_pool
3129 * 2/ resize conf->mirrors
3131 * We allocate a new r1bio_pool if we can.
3132 * Then raise a device barrier and wait until all IO stops.
3133 * Then resize conf->mirrors and swap in the new r1bio pool.
3135 * At the same time, we "pack" the devices so that all the missing
3136 * devices have the higher raid_disk numbers.
3138 mempool_t
*newpool
, *oldpool
;
3139 struct pool_info
*newpoolinfo
;
3140 struct raid1_info
*newmirrors
;
3141 struct r1conf
*conf
= mddev
->private;
3142 int cnt
, raid_disks
;
3143 unsigned long flags
;
3146 /* Cannot change chunk_size, layout, or level */
3147 if (mddev
->chunk_sectors
!= mddev
->new_chunk_sectors
||
3148 mddev
->layout
!= mddev
->new_layout
||
3149 mddev
->level
!= mddev
->new_level
) {
3150 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3151 mddev
->new_layout
= mddev
->layout
;
3152 mddev
->new_level
= mddev
->level
;
3156 if (!mddev_is_clustered(mddev
)) {
3157 err
= md_allow_write(mddev
);
3162 raid_disks
= mddev
->raid_disks
+ mddev
->delta_disks
;
3164 if (raid_disks
< conf
->raid_disks
) {
3166 for (d
= 0; d
< conf
->raid_disks
; d
++)
3167 if (conf
->mirrors
[d
].rdev
)
3169 if (cnt
> raid_disks
)
3173 newpoolinfo
= kmalloc(sizeof(*newpoolinfo
), GFP_KERNEL
);
3176 newpoolinfo
->mddev
= mddev
;
3177 newpoolinfo
->raid_disks
= raid_disks
* 2;
3179 newpool
= mempool_create(NR_RAID1_BIOS
, r1bio_pool_alloc
,
3180 r1bio_pool_free
, newpoolinfo
);
3185 newmirrors
= kzalloc(sizeof(struct raid1_info
) * raid_disks
* 2,
3189 mempool_destroy(newpool
);
3193 freeze_array(conf
, 0);
3195 /* ok, everything is stopped */
3196 oldpool
= conf
->r1bio_pool
;
3197 conf
->r1bio_pool
= newpool
;
3199 for (d
= d2
= 0; d
< conf
->raid_disks
; d
++) {
3200 struct md_rdev
*rdev
= conf
->mirrors
[d
].rdev
;
3201 if (rdev
&& rdev
->raid_disk
!= d2
) {
3202 sysfs_unlink_rdev(mddev
, rdev
);
3203 rdev
->raid_disk
= d2
;
3204 sysfs_unlink_rdev(mddev
, rdev
);
3205 if (sysfs_link_rdev(mddev
, rdev
))
3206 pr_warn("md/raid1:%s: cannot register rd%d\n",
3207 mdname(mddev
), rdev
->raid_disk
);
3210 newmirrors
[d2
++].rdev
= rdev
;
3212 kfree(conf
->mirrors
);
3213 conf
->mirrors
= newmirrors
;
3214 kfree(conf
->poolinfo
);
3215 conf
->poolinfo
= newpoolinfo
;
3217 spin_lock_irqsave(&conf
->device_lock
, flags
);
3218 mddev
->degraded
+= (raid_disks
- conf
->raid_disks
);
3219 spin_unlock_irqrestore(&conf
->device_lock
, flags
);
3220 conf
->raid_disks
= mddev
->raid_disks
= raid_disks
;
3221 mddev
->delta_disks
= 0;
3223 unfreeze_array(conf
);
3225 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
3226 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3227 md_wakeup_thread(mddev
->thread
);
3229 mempool_destroy(oldpool
);
3233 static void raid1_quiesce(struct mddev
*mddev
, int state
)
3235 struct r1conf
*conf
= mddev
->private;
3238 case 2: /* wake for suspend */
3239 wake_up(&conf
->wait_barrier
);
3242 freeze_array(conf
, 0);
3245 unfreeze_array(conf
);
3250 static void *raid1_takeover(struct mddev
*mddev
)
3252 /* raid1 can take over:
3253 * raid5 with 2 devices, any layout or chunk size
3255 if (mddev
->level
== 5 && mddev
->raid_disks
== 2) {
3256 struct r1conf
*conf
;
3257 mddev
->new_level
= 1;
3258 mddev
->new_layout
= 0;
3259 mddev
->new_chunk_sectors
= 0;
3260 conf
= setup_conf(mddev
);
3261 if (!IS_ERR(conf
)) {
3262 /* Array must appear to be quiesced */
3263 conf
->array_frozen
= 1;
3264 mddev_clear_unsupported_flags(mddev
,
3265 UNSUPPORTED_MDDEV_FLAGS
);
3269 return ERR_PTR(-EINVAL
);
3272 static struct md_personality raid1_personality
=
3276 .owner
= THIS_MODULE
,
3277 .make_request
= raid1_make_request
,
3280 .status
= raid1_status
,
3281 .error_handler
= raid1_error
,
3282 .hot_add_disk
= raid1_add_disk
,
3283 .hot_remove_disk
= raid1_remove_disk
,
3284 .spare_active
= raid1_spare_active
,
3285 .sync_request
= raid1_sync_request
,
3286 .resize
= raid1_resize
,
3288 .check_reshape
= raid1_reshape
,
3289 .quiesce
= raid1_quiesce
,
3290 .takeover
= raid1_takeover
,
3291 .congested
= raid1_congested
,
3294 static int __init
raid_init(void)
3296 return register_md_personality(&raid1_personality
);
3299 static void raid_exit(void)
3301 unregister_md_personality(&raid1_personality
);
3304 module_init(raid_init
);
3305 module_exit(raid_exit
);
3306 MODULE_LICENSE("GPL");
3307 MODULE_DESCRIPTION("RAID1 (mirroring) personality for MD");
3308 MODULE_ALIAS("md-personality-3"); /* RAID1 */
3309 MODULE_ALIAS("md-raid1");
3310 MODULE_ALIAS("md-level-1");
3312 module_param(max_queued_requests
, int, S_IRUGO
|S_IWUSR
);