2 * raid10.c : Multiple Devices driver for Linux
4 * Copyright (C) 2000-2004 Neil Brown
6 * RAID-10 support for md.
8 * Base on code in raid1.c. See raid1.c for further copyright information.
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2, or (at your option)
16 * You should have received a copy of the GNU General Public License
17 * (for example /usr/src/linux/COPYING); if not, write to the Free
18 * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 #include <linux/slab.h>
22 #include <linux/delay.h>
23 #include <linux/blkdev.h>
24 #include <linux/module.h>
25 #include <linux/seq_file.h>
26 #include <linux/ratelimit.h>
27 #include <linux/kthread.h>
34 * RAID10 provides a combination of RAID0 and RAID1 functionality.
35 * The layout of data is defined by
38 * near_copies (stored in low byte of layout)
39 * far_copies (stored in second byte of layout)
40 * far_offset (stored in bit 16 of layout )
41 * use_far_sets (stored in bit 17 of layout )
43 * The data to be stored is divided into chunks using chunksize. Each device
44 * is divided into far_copies sections. In each section, chunks are laid out
45 * in a style similar to raid0, but near_copies copies of each chunk is stored
46 * (each on a different drive). The starting device for each section is offset
47 * near_copies from the starting device of the previous section. Thus there
48 * are (near_copies * far_copies) of each chunk, and each is on a different
49 * drive. near_copies and far_copies must be at least one, and their product
50 * is at most raid_disks.
52 * If far_offset is true, then the far_copies are handled a bit differently.
53 * The copies are still in different stripes, but instead of being very far
54 * apart on disk, there are adjacent stripes.
56 * The far and offset algorithms are handled slightly differently if
57 * 'use_far_sets' is true. In this case, the array's devices are grouped into
58 * sets that are (near_copies * far_copies) in size. The far copied stripes
59 * are still shifted by 'near_copies' devices, but this shifting stays confined
60 * to the set rather than the entire array. This is done to improve the number
61 * of device combinations that can fail without causing the array to fail.
62 * Example 'far' algorithm w/o 'use_far_sets' (each letter represents a chunk
67 * Example 'far' algorithm w/ 'use_far_sets' enabled (sets illustrated w/ []'s):
68 * [A B] [C D] [A B] [C D E]
69 * |...| |...| |...| | ... |
70 * [B A] [D C] [B A] [E C D]
74 * Number of guaranteed r10bios in case of extreme VM load:
76 #define NR_RAID10_BIOS 256
78 /* when we get a read error on a read-only array, we redirect to another
79 * device without failing the first device, or trying to over-write to
80 * correct the read error. To keep track of bad blocks on a per-bio
81 * level, we store IO_BLOCKED in the appropriate 'bios' pointer
83 #define IO_BLOCKED ((struct bio *)1)
84 /* When we successfully write to a known bad-block, we need to remove the
85 * bad-block marking which must be done from process context. So we record
86 * the success by setting devs[n].bio to IO_MADE_GOOD
88 #define IO_MADE_GOOD ((struct bio *)2)
90 #define BIO_SPECIAL(bio) ((unsigned long)bio <= 2)
92 /* When there are this many requests queued to be written by
93 * the raid10 thread, we become 'congested' to provide back-pressure
96 static int max_queued_requests
= 1024;
98 static void allow_barrier(struct r10conf
*conf
);
99 static void lower_barrier(struct r10conf
*conf
);
100 static int _enough(struct r10conf
*conf
, int previous
, int ignore
);
101 static sector_t
reshape_request(struct mddev
*mddev
, sector_t sector_nr
,
103 static void reshape_request_write(struct mddev
*mddev
, struct r10bio
*r10_bio
);
104 static void end_reshape_write(struct bio
*bio
);
105 static void end_reshape(struct r10conf
*conf
);
107 static void * r10bio_pool_alloc(gfp_t gfp_flags
, void *data
)
109 struct r10conf
*conf
= data
;
110 int size
= offsetof(struct r10bio
, devs
[conf
->copies
]);
112 /* allocate a r10bio with room for raid_disks entries in the
114 return kzalloc(size
, gfp_flags
);
117 static void r10bio_pool_free(void *r10_bio
, void *data
)
122 /* Maximum size of each resync request */
123 #define RESYNC_BLOCK_SIZE (64*1024)
124 #define RESYNC_PAGES ((RESYNC_BLOCK_SIZE + PAGE_SIZE-1) / PAGE_SIZE)
125 /* amount of memory to reserve for resync requests */
126 #define RESYNC_WINDOW (1024*1024)
127 /* maximum number of concurrent requests, memory permitting */
128 #define RESYNC_DEPTH (32*1024*1024/RESYNC_BLOCK_SIZE)
131 * When performing a resync, we need to read and compare, so
132 * we need as many pages are there are copies.
133 * When performing a recovery, we need 2 bios, one for read,
134 * one for write (we recover only one drive per r10buf)
137 static void * r10buf_pool_alloc(gfp_t gfp_flags
, void *data
)
139 struct r10conf
*conf
= data
;
141 struct r10bio
*r10_bio
;
146 r10_bio
= r10bio_pool_alloc(gfp_flags
, conf
);
150 if (test_bit(MD_RECOVERY_SYNC
, &conf
->mddev
->recovery
) ||
151 test_bit(MD_RECOVERY_RESHAPE
, &conf
->mddev
->recovery
))
152 nalloc
= conf
->copies
; /* resync */
154 nalloc
= 2; /* recovery */
159 for (j
= nalloc
; j
-- ; ) {
160 bio
= bio_kmalloc(gfp_flags
, RESYNC_PAGES
);
163 r10_bio
->devs
[j
].bio
= bio
;
164 if (!conf
->have_replacement
)
166 bio
= bio_kmalloc(gfp_flags
, RESYNC_PAGES
);
169 r10_bio
->devs
[j
].repl_bio
= bio
;
172 * Allocate RESYNC_PAGES data pages and attach them
175 for (j
= 0 ; j
< nalloc
; j
++) {
176 struct bio
*rbio
= r10_bio
->devs
[j
].repl_bio
;
177 bio
= r10_bio
->devs
[j
].bio
;
178 for (i
= 0; i
< RESYNC_PAGES
; i
++) {
179 if (j
> 0 && !test_bit(MD_RECOVERY_SYNC
,
180 &conf
->mddev
->recovery
)) {
181 /* we can share bv_page's during recovery
183 struct bio
*rbio
= r10_bio
->devs
[0].bio
;
184 page
= rbio
->bi_io_vec
[i
].bv_page
;
187 page
= alloc_page(gfp_flags
);
191 bio
->bi_io_vec
[i
].bv_page
= page
;
193 rbio
->bi_io_vec
[i
].bv_page
= page
;
201 safe_put_page(bio
->bi_io_vec
[i
-1].bv_page
);
203 for (i
= 0; i
< RESYNC_PAGES
; i
++)
204 safe_put_page(r10_bio
->devs
[j
].bio
->bi_io_vec
[i
].bv_page
);
207 for ( ; j
< nalloc
; j
++) {
208 if (r10_bio
->devs
[j
].bio
)
209 bio_put(r10_bio
->devs
[j
].bio
);
210 if (r10_bio
->devs
[j
].repl_bio
)
211 bio_put(r10_bio
->devs
[j
].repl_bio
);
213 r10bio_pool_free(r10_bio
, conf
);
217 static void r10buf_pool_free(void *__r10_bio
, void *data
)
220 struct r10conf
*conf
= data
;
221 struct r10bio
*r10bio
= __r10_bio
;
224 for (j
=0; j
< conf
->copies
; j
++) {
225 struct bio
*bio
= r10bio
->devs
[j
].bio
;
227 for (i
= 0; i
< RESYNC_PAGES
; i
++) {
228 safe_put_page(bio
->bi_io_vec
[i
].bv_page
);
229 bio
->bi_io_vec
[i
].bv_page
= NULL
;
233 bio
= r10bio
->devs
[j
].repl_bio
;
237 r10bio_pool_free(r10bio
, conf
);
240 static void put_all_bios(struct r10conf
*conf
, struct r10bio
*r10_bio
)
244 for (i
= 0; i
< conf
->copies
; i
++) {
245 struct bio
**bio
= & r10_bio
->devs
[i
].bio
;
246 if (!BIO_SPECIAL(*bio
))
249 bio
= &r10_bio
->devs
[i
].repl_bio
;
250 if (r10_bio
->read_slot
< 0 && !BIO_SPECIAL(*bio
))
256 static void free_r10bio(struct r10bio
*r10_bio
)
258 struct r10conf
*conf
= r10_bio
->mddev
->private;
260 put_all_bios(conf
, r10_bio
);
261 mempool_free(r10_bio
, conf
->r10bio_pool
);
264 static void put_buf(struct r10bio
*r10_bio
)
266 struct r10conf
*conf
= r10_bio
->mddev
->private;
268 mempool_free(r10_bio
, conf
->r10buf_pool
);
273 static void reschedule_retry(struct r10bio
*r10_bio
)
276 struct mddev
*mddev
= r10_bio
->mddev
;
277 struct r10conf
*conf
= mddev
->private;
279 spin_lock_irqsave(&conf
->device_lock
, flags
);
280 list_add(&r10_bio
->retry_list
, &conf
->retry_list
);
282 spin_unlock_irqrestore(&conf
->device_lock
, flags
);
284 /* wake up frozen array... */
285 wake_up(&conf
->wait_barrier
);
287 md_wakeup_thread(mddev
->thread
);
291 * raid_end_bio_io() is called when we have finished servicing a mirrored
292 * operation and are ready to return a success/failure code to the buffer
295 static void raid_end_bio_io(struct r10bio
*r10_bio
)
297 struct bio
*bio
= r10_bio
->master_bio
;
299 struct r10conf
*conf
= r10_bio
->mddev
->private;
301 if (bio
->bi_phys_segments
) {
303 spin_lock_irqsave(&conf
->device_lock
, flags
);
304 bio
->bi_phys_segments
--;
305 done
= (bio
->bi_phys_segments
== 0);
306 spin_unlock_irqrestore(&conf
->device_lock
, flags
);
309 if (!test_bit(R10BIO_Uptodate
, &r10_bio
->state
))
310 bio
->bi_error
= -EIO
;
314 * Wake up any possible resync thread that waits for the device
319 free_r10bio(r10_bio
);
323 * Update disk head position estimator based on IRQ completion info.
325 static inline void update_head_pos(int slot
, struct r10bio
*r10_bio
)
327 struct r10conf
*conf
= r10_bio
->mddev
->private;
329 conf
->mirrors
[r10_bio
->devs
[slot
].devnum
].head_position
=
330 r10_bio
->devs
[slot
].addr
+ (r10_bio
->sectors
);
334 * Find the disk number which triggered given bio
336 static int find_bio_disk(struct r10conf
*conf
, struct r10bio
*r10_bio
,
337 struct bio
*bio
, int *slotp
, int *replp
)
342 for (slot
= 0; slot
< conf
->copies
; slot
++) {
343 if (r10_bio
->devs
[slot
].bio
== bio
)
345 if (r10_bio
->devs
[slot
].repl_bio
== bio
) {
351 BUG_ON(slot
== conf
->copies
);
352 update_head_pos(slot
, r10_bio
);
358 return r10_bio
->devs
[slot
].devnum
;
361 static void raid10_end_read_request(struct bio
*bio
)
363 int uptodate
= !bio
->bi_error
;
364 struct r10bio
*r10_bio
= bio
->bi_private
;
366 struct md_rdev
*rdev
;
367 struct r10conf
*conf
= r10_bio
->mddev
->private;
369 slot
= r10_bio
->read_slot
;
370 dev
= r10_bio
->devs
[slot
].devnum
;
371 rdev
= r10_bio
->devs
[slot
].rdev
;
373 * this branch is our 'one mirror IO has finished' event handler:
375 update_head_pos(slot
, r10_bio
);
379 * Set R10BIO_Uptodate in our master bio, so that
380 * we will return a good error code to the higher
381 * levels even if IO on some other mirrored buffer fails.
383 * The 'master' represents the composite IO operation to
384 * user-side. So if something waits for IO, then it will
385 * wait for the 'master' bio.
387 set_bit(R10BIO_Uptodate
, &r10_bio
->state
);
389 /* If all other devices that store this block have
390 * failed, we want to return the error upwards rather
391 * than fail the last device. Here we redefine
392 * "uptodate" to mean "Don't want to retry"
394 if (!_enough(conf
, test_bit(R10BIO_Previous
, &r10_bio
->state
),
399 raid_end_bio_io(r10_bio
);
400 rdev_dec_pending(rdev
, conf
->mddev
);
403 * oops, read error - keep the refcount on the rdev
405 char b
[BDEVNAME_SIZE
];
406 printk_ratelimited(KERN_ERR
407 "md/raid10:%s: %s: rescheduling sector %llu\n",
409 bdevname(rdev
->bdev
, b
),
410 (unsigned long long)r10_bio
->sector
);
411 set_bit(R10BIO_ReadError
, &r10_bio
->state
);
412 reschedule_retry(r10_bio
);
416 static void close_write(struct r10bio
*r10_bio
)
418 /* clear the bitmap if all writes complete successfully */
419 bitmap_endwrite(r10_bio
->mddev
->bitmap
, r10_bio
->sector
,
421 !test_bit(R10BIO_Degraded
, &r10_bio
->state
),
423 md_write_end(r10_bio
->mddev
);
426 static void one_write_done(struct r10bio
*r10_bio
)
428 if (atomic_dec_and_test(&r10_bio
->remaining
)) {
429 if (test_bit(R10BIO_WriteError
, &r10_bio
->state
))
430 reschedule_retry(r10_bio
);
432 close_write(r10_bio
);
433 if (test_bit(R10BIO_MadeGood
, &r10_bio
->state
))
434 reschedule_retry(r10_bio
);
436 raid_end_bio_io(r10_bio
);
441 static void raid10_end_write_request(struct bio
*bio
)
443 struct r10bio
*r10_bio
= bio
->bi_private
;
446 struct r10conf
*conf
= r10_bio
->mddev
->private;
448 struct md_rdev
*rdev
= NULL
;
450 dev
= find_bio_disk(conf
, r10_bio
, bio
, &slot
, &repl
);
453 rdev
= conf
->mirrors
[dev
].replacement
;
457 rdev
= conf
->mirrors
[dev
].rdev
;
460 * this branch is our 'one mirror IO has finished' event handler:
464 /* Never record new bad blocks to replacement,
467 md_error(rdev
->mddev
, rdev
);
469 set_bit(WriteErrorSeen
, &rdev
->flags
);
470 if (!test_and_set_bit(WantReplacement
, &rdev
->flags
))
471 set_bit(MD_RECOVERY_NEEDED
,
472 &rdev
->mddev
->recovery
);
473 set_bit(R10BIO_WriteError
, &r10_bio
->state
);
478 * Set R10BIO_Uptodate in our master bio, so that
479 * we will return a good error code for to the higher
480 * levels even if IO on some other mirrored buffer fails.
482 * The 'master' represents the composite IO operation to
483 * user-side. So if something waits for IO, then it will
484 * wait for the 'master' bio.
490 * Do not set R10BIO_Uptodate if the current device is
491 * rebuilding or Faulty. This is because we cannot use
492 * such device for properly reading the data back (we could
493 * potentially use it, if the current write would have felt
494 * before rdev->recovery_offset, but for simplicity we don't
497 if (test_bit(In_sync
, &rdev
->flags
) &&
498 !test_bit(Faulty
, &rdev
->flags
))
499 set_bit(R10BIO_Uptodate
, &r10_bio
->state
);
501 /* Maybe we can clear some bad blocks. */
502 if (is_badblock(rdev
,
503 r10_bio
->devs
[slot
].addr
,
505 &first_bad
, &bad_sectors
)) {
508 r10_bio
->devs
[slot
].repl_bio
= IO_MADE_GOOD
;
510 r10_bio
->devs
[slot
].bio
= IO_MADE_GOOD
;
512 set_bit(R10BIO_MadeGood
, &r10_bio
->state
);
518 * Let's see if all mirrored write operations have finished
521 one_write_done(r10_bio
);
523 rdev_dec_pending(rdev
, conf
->mddev
);
527 * RAID10 layout manager
528 * As well as the chunksize and raid_disks count, there are two
529 * parameters: near_copies and far_copies.
530 * near_copies * far_copies must be <= raid_disks.
531 * Normally one of these will be 1.
532 * If both are 1, we get raid0.
533 * If near_copies == raid_disks, we get raid1.
535 * Chunks are laid out in raid0 style with near_copies copies of the
536 * first chunk, followed by near_copies copies of the next chunk and
538 * If far_copies > 1, then after 1/far_copies of the array has been assigned
539 * as described above, we start again with a device offset of near_copies.
540 * So we effectively have another copy of the whole array further down all
541 * the drives, but with blocks on different drives.
542 * With this layout, and block is never stored twice on the one device.
544 * raid10_find_phys finds the sector offset of a given virtual sector
545 * on each device that it is on.
547 * raid10_find_virt does the reverse mapping, from a device and a
548 * sector offset to a virtual address
551 static void __raid10_find_phys(struct geom
*geo
, struct r10bio
*r10bio
)
559 int last_far_set_start
, last_far_set_size
;
561 last_far_set_start
= (geo
->raid_disks
/ geo
->far_set_size
) - 1;
562 last_far_set_start
*= geo
->far_set_size
;
564 last_far_set_size
= geo
->far_set_size
;
565 last_far_set_size
+= (geo
->raid_disks
% geo
->far_set_size
);
567 /* now calculate first sector/dev */
568 chunk
= r10bio
->sector
>> geo
->chunk_shift
;
569 sector
= r10bio
->sector
& geo
->chunk_mask
;
571 chunk
*= geo
->near_copies
;
573 dev
= sector_div(stripe
, geo
->raid_disks
);
575 stripe
*= geo
->far_copies
;
577 sector
+= stripe
<< geo
->chunk_shift
;
579 /* and calculate all the others */
580 for (n
= 0; n
< geo
->near_copies
; n
++) {
584 r10bio
->devs
[slot
].devnum
= d
;
585 r10bio
->devs
[slot
].addr
= s
;
588 for (f
= 1; f
< geo
->far_copies
; f
++) {
589 set
= d
/ geo
->far_set_size
;
590 d
+= geo
->near_copies
;
592 if ((geo
->raid_disks
% geo
->far_set_size
) &&
593 (d
> last_far_set_start
)) {
594 d
-= last_far_set_start
;
595 d
%= last_far_set_size
;
596 d
+= last_far_set_start
;
598 d
%= geo
->far_set_size
;
599 d
+= geo
->far_set_size
* set
;
602 r10bio
->devs
[slot
].devnum
= d
;
603 r10bio
->devs
[slot
].addr
= s
;
607 if (dev
>= geo
->raid_disks
) {
609 sector
+= (geo
->chunk_mask
+ 1);
614 static void raid10_find_phys(struct r10conf
*conf
, struct r10bio
*r10bio
)
616 struct geom
*geo
= &conf
->geo
;
618 if (conf
->reshape_progress
!= MaxSector
&&
619 ((r10bio
->sector
>= conf
->reshape_progress
) !=
620 conf
->mddev
->reshape_backwards
)) {
621 set_bit(R10BIO_Previous
, &r10bio
->state
);
624 clear_bit(R10BIO_Previous
, &r10bio
->state
);
626 __raid10_find_phys(geo
, r10bio
);
629 static sector_t
raid10_find_virt(struct r10conf
*conf
, sector_t sector
, int dev
)
631 sector_t offset
, chunk
, vchunk
;
632 /* Never use conf->prev as this is only called during resync
633 * or recovery, so reshape isn't happening
635 struct geom
*geo
= &conf
->geo
;
636 int far_set_start
= (dev
/ geo
->far_set_size
) * geo
->far_set_size
;
637 int far_set_size
= geo
->far_set_size
;
638 int last_far_set_start
;
640 if (geo
->raid_disks
% geo
->far_set_size
) {
641 last_far_set_start
= (geo
->raid_disks
/ geo
->far_set_size
) - 1;
642 last_far_set_start
*= geo
->far_set_size
;
644 if (dev
>= last_far_set_start
) {
645 far_set_size
= geo
->far_set_size
;
646 far_set_size
+= (geo
->raid_disks
% geo
->far_set_size
);
647 far_set_start
= last_far_set_start
;
651 offset
= sector
& geo
->chunk_mask
;
652 if (geo
->far_offset
) {
654 chunk
= sector
>> geo
->chunk_shift
;
655 fc
= sector_div(chunk
, geo
->far_copies
);
656 dev
-= fc
* geo
->near_copies
;
657 if (dev
< far_set_start
)
660 while (sector
>= geo
->stride
) {
661 sector
-= geo
->stride
;
662 if (dev
< (geo
->near_copies
+ far_set_start
))
663 dev
+= far_set_size
- geo
->near_copies
;
665 dev
-= geo
->near_copies
;
667 chunk
= sector
>> geo
->chunk_shift
;
669 vchunk
= chunk
* geo
->raid_disks
+ dev
;
670 sector_div(vchunk
, geo
->near_copies
);
671 return (vchunk
<< geo
->chunk_shift
) + offset
;
675 * This routine returns the disk from which the requested read should
676 * be done. There is a per-array 'next expected sequential IO' sector
677 * number - if this matches on the next IO then we use the last disk.
678 * There is also a per-disk 'last know head position' sector that is
679 * maintained from IRQ contexts, both the normal and the resync IO
680 * completion handlers update this position correctly. If there is no
681 * perfect sequential match then we pick the disk whose head is closest.
683 * If there are 2 mirrors in the same 2 devices, performance degrades
684 * because position is mirror, not device based.
686 * The rdev for the device selected will have nr_pending incremented.
690 * FIXME: possibly should rethink readbalancing and do it differently
691 * depending on near_copies / far_copies geometry.
693 static struct md_rdev
*read_balance(struct r10conf
*conf
,
694 struct r10bio
*r10_bio
,
697 const sector_t this_sector
= r10_bio
->sector
;
699 int sectors
= r10_bio
->sectors
;
700 int best_good_sectors
;
701 sector_t new_distance
, best_dist
;
702 struct md_rdev
*best_rdev
, *rdev
= NULL
;
705 struct geom
*geo
= &conf
->geo
;
707 raid10_find_phys(conf
, r10_bio
);
710 sectors
= r10_bio
->sectors
;
713 best_dist
= MaxSector
;
714 best_good_sectors
= 0;
717 * Check if we can balance. We can balance on the whole
718 * device if no resync is going on (recovery is ok), or below
719 * the resync window. We take the first readable disk when
720 * above the resync window.
722 if (conf
->mddev
->recovery_cp
< MaxSector
723 && (this_sector
+ sectors
>= conf
->next_resync
))
726 for (slot
= 0; slot
< conf
->copies
; slot
++) {
731 if (r10_bio
->devs
[slot
].bio
== IO_BLOCKED
)
733 disk
= r10_bio
->devs
[slot
].devnum
;
734 rdev
= rcu_dereference(conf
->mirrors
[disk
].replacement
);
735 if (rdev
== NULL
|| test_bit(Faulty
, &rdev
->flags
) ||
736 r10_bio
->devs
[slot
].addr
+ sectors
> rdev
->recovery_offset
)
737 rdev
= rcu_dereference(conf
->mirrors
[disk
].rdev
);
739 test_bit(Faulty
, &rdev
->flags
))
741 if (!test_bit(In_sync
, &rdev
->flags
) &&
742 r10_bio
->devs
[slot
].addr
+ sectors
> rdev
->recovery_offset
)
745 dev_sector
= r10_bio
->devs
[slot
].addr
;
746 if (is_badblock(rdev
, dev_sector
, sectors
,
747 &first_bad
, &bad_sectors
)) {
748 if (best_dist
< MaxSector
)
749 /* Already have a better slot */
751 if (first_bad
<= dev_sector
) {
752 /* Cannot read here. If this is the
753 * 'primary' device, then we must not read
754 * beyond 'bad_sectors' from another device.
756 bad_sectors
-= (dev_sector
- first_bad
);
757 if (!do_balance
&& sectors
> bad_sectors
)
758 sectors
= bad_sectors
;
759 if (best_good_sectors
> sectors
)
760 best_good_sectors
= sectors
;
762 sector_t good_sectors
=
763 first_bad
- dev_sector
;
764 if (good_sectors
> best_good_sectors
) {
765 best_good_sectors
= good_sectors
;
770 /* Must read from here */
775 best_good_sectors
= sectors
;
780 /* This optimisation is debatable, and completely destroys
781 * sequential read speed for 'far copies' arrays. So only
782 * keep it for 'near' arrays, and review those later.
784 if (geo
->near_copies
> 1 && !atomic_read(&rdev
->nr_pending
))
787 /* for far > 1 always use the lowest address */
788 if (geo
->far_copies
> 1)
789 new_distance
= r10_bio
->devs
[slot
].addr
;
791 new_distance
= abs(r10_bio
->devs
[slot
].addr
-
792 conf
->mirrors
[disk
].head_position
);
793 if (new_distance
< best_dist
) {
794 best_dist
= new_distance
;
799 if (slot
>= conf
->copies
) {
805 atomic_inc(&rdev
->nr_pending
);
806 if (test_bit(Faulty
, &rdev
->flags
)) {
807 /* Cannot risk returning a device that failed
808 * before we inc'ed nr_pending
810 rdev_dec_pending(rdev
, conf
->mddev
);
813 r10_bio
->read_slot
= slot
;
817 *max_sectors
= best_good_sectors
;
822 static int raid10_congested(struct mddev
*mddev
, int bits
)
824 struct r10conf
*conf
= mddev
->private;
827 if ((bits
& (1 << WB_async_congested
)) &&
828 conf
->pending_count
>= max_queued_requests
)
833 (i
< conf
->geo
.raid_disks
|| i
< conf
->prev
.raid_disks
)
836 struct md_rdev
*rdev
= rcu_dereference(conf
->mirrors
[i
].rdev
);
837 if (rdev
&& !test_bit(Faulty
, &rdev
->flags
)) {
838 struct request_queue
*q
= bdev_get_queue(rdev
->bdev
);
840 ret
|= bdi_congested(&q
->backing_dev_info
, bits
);
847 static void flush_pending_writes(struct r10conf
*conf
)
849 /* Any writes that have been queued but are awaiting
850 * bitmap updates get flushed here.
852 spin_lock_irq(&conf
->device_lock
);
854 if (conf
->pending_bio_list
.head
) {
856 bio
= bio_list_get(&conf
->pending_bio_list
);
857 conf
->pending_count
= 0;
858 spin_unlock_irq(&conf
->device_lock
);
859 /* flush any pending bitmap writes to disk
860 * before proceeding w/ I/O */
861 bitmap_unplug(conf
->mddev
->bitmap
);
862 wake_up(&conf
->wait_barrier
);
864 while (bio
) { /* submit pending writes */
865 struct bio
*next
= bio
->bi_next
;
867 if (unlikely((bio
->bi_rw
& REQ_DISCARD
) &&
868 !blk_queue_discard(bdev_get_queue(bio
->bi_bdev
))))
872 generic_make_request(bio
);
876 spin_unlock_irq(&conf
->device_lock
);
880 * Sometimes we need to suspend IO while we do something else,
881 * either some resync/recovery, or reconfigure the array.
882 * To do this we raise a 'barrier'.
883 * The 'barrier' is a counter that can be raised multiple times
884 * to count how many activities are happening which preclude
886 * We can only raise the barrier if there is no pending IO.
887 * i.e. if nr_pending == 0.
888 * We choose only to raise the barrier if no-one is waiting for the
889 * barrier to go down. This means that as soon as an IO request
890 * is ready, no other operations which require a barrier will start
891 * until the IO request has had a chance.
893 * So: regular IO calls 'wait_barrier'. When that returns there
894 * is no backgroup IO happening, It must arrange to call
895 * allow_barrier when it has finished its IO.
896 * backgroup IO calls must call raise_barrier. Once that returns
897 * there is no normal IO happeing. It must arrange to call
898 * lower_barrier when the particular background IO completes.
901 static void raise_barrier(struct r10conf
*conf
, int force
)
903 BUG_ON(force
&& !conf
->barrier
);
904 spin_lock_irq(&conf
->resync_lock
);
906 /* Wait until no block IO is waiting (unless 'force') */
907 wait_event_lock_irq(conf
->wait_barrier
, force
|| !conf
->nr_waiting
,
910 /* block any new IO from starting */
913 /* Now wait for all pending IO to complete */
914 wait_event_lock_irq(conf
->wait_barrier
,
915 !conf
->nr_pending
&& conf
->barrier
< RESYNC_DEPTH
,
918 spin_unlock_irq(&conf
->resync_lock
);
921 static void lower_barrier(struct r10conf
*conf
)
924 spin_lock_irqsave(&conf
->resync_lock
, flags
);
926 spin_unlock_irqrestore(&conf
->resync_lock
, flags
);
927 wake_up(&conf
->wait_barrier
);
930 static void wait_barrier(struct r10conf
*conf
)
932 spin_lock_irq(&conf
->resync_lock
);
935 /* Wait for the barrier to drop.
936 * However if there are already pending
937 * requests (preventing the barrier from
938 * rising completely), and the
939 * pre-process bio queue isn't empty,
940 * then don't wait, as we need to empty
941 * that queue to get the nr_pending
944 wait_event_lock_irq(conf
->wait_barrier
,
948 !bio_list_empty(current
->bio_list
)),
953 spin_unlock_irq(&conf
->resync_lock
);
956 static void allow_barrier(struct r10conf
*conf
)
959 spin_lock_irqsave(&conf
->resync_lock
, flags
);
961 spin_unlock_irqrestore(&conf
->resync_lock
, flags
);
962 wake_up(&conf
->wait_barrier
);
965 static void freeze_array(struct r10conf
*conf
, int extra
)
967 /* stop syncio and normal IO and wait for everything to
969 * We increment barrier and nr_waiting, and then
970 * wait until nr_pending match nr_queued+extra
971 * This is called in the context of one normal IO request
972 * that has failed. Thus any sync request that might be pending
973 * will be blocked by nr_pending, and we need to wait for
974 * pending IO requests to complete or be queued for re-try.
975 * Thus the number queued (nr_queued) plus this request (extra)
976 * must match the number of pending IOs (nr_pending) before
979 spin_lock_irq(&conf
->resync_lock
);
982 wait_event_lock_irq_cmd(conf
->wait_barrier
,
983 conf
->nr_pending
== conf
->nr_queued
+extra
,
985 flush_pending_writes(conf
));
987 spin_unlock_irq(&conf
->resync_lock
);
990 static void unfreeze_array(struct r10conf
*conf
)
992 /* reverse the effect of the freeze */
993 spin_lock_irq(&conf
->resync_lock
);
996 wake_up(&conf
->wait_barrier
);
997 spin_unlock_irq(&conf
->resync_lock
);
1000 static sector_t
choose_data_offset(struct r10bio
*r10_bio
,
1001 struct md_rdev
*rdev
)
1003 if (!test_bit(MD_RECOVERY_RESHAPE
, &rdev
->mddev
->recovery
) ||
1004 test_bit(R10BIO_Previous
, &r10_bio
->state
))
1005 return rdev
->data_offset
;
1007 return rdev
->new_data_offset
;
1010 struct raid10_plug_cb
{
1011 struct blk_plug_cb cb
;
1012 struct bio_list pending
;
1016 static void raid10_unplug(struct blk_plug_cb
*cb
, bool from_schedule
)
1018 struct raid10_plug_cb
*plug
= container_of(cb
, struct raid10_plug_cb
,
1020 struct mddev
*mddev
= plug
->cb
.data
;
1021 struct r10conf
*conf
= mddev
->private;
1024 if (from_schedule
|| current
->bio_list
) {
1025 spin_lock_irq(&conf
->device_lock
);
1026 bio_list_merge(&conf
->pending_bio_list
, &plug
->pending
);
1027 conf
->pending_count
+= plug
->pending_cnt
;
1028 spin_unlock_irq(&conf
->device_lock
);
1029 wake_up(&conf
->wait_barrier
);
1030 md_wakeup_thread(mddev
->thread
);
1035 /* we aren't scheduling, so we can do the write-out directly. */
1036 bio
= bio_list_get(&plug
->pending
);
1037 bitmap_unplug(mddev
->bitmap
);
1038 wake_up(&conf
->wait_barrier
);
1040 while (bio
) { /* submit pending writes */
1041 struct bio
*next
= bio
->bi_next
;
1042 bio
->bi_next
= NULL
;
1043 if (unlikely((bio
->bi_rw
& REQ_DISCARD
) &&
1044 !blk_queue_discard(bdev_get_queue(bio
->bi_bdev
))))
1045 /* Just ignore it */
1048 generic_make_request(bio
);
1054 static void __make_request(struct mddev
*mddev
, struct bio
*bio
)
1056 struct r10conf
*conf
= mddev
->private;
1057 struct r10bio
*r10_bio
;
1058 struct bio
*read_bio
;
1060 const int rw
= bio_data_dir(bio
);
1061 const unsigned long do_sync
= (bio
->bi_rw
& REQ_SYNC
);
1062 const unsigned long do_fua
= (bio
->bi_rw
& REQ_FUA
);
1063 const unsigned long do_discard
= (bio
->bi_rw
1064 & (REQ_DISCARD
| REQ_SECURE
));
1065 const unsigned long do_same
= (bio
->bi_rw
& REQ_WRITE_SAME
);
1066 unsigned long flags
;
1067 struct md_rdev
*blocked_rdev
;
1068 struct blk_plug_cb
*cb
;
1069 struct raid10_plug_cb
*plug
= NULL
;
1070 int sectors_handled
;
1075 * Register the new request and wait if the reconstruction
1076 * thread has put up a bar for new requests.
1077 * Continue immediately if no resync is active currently.
1081 sectors
= bio_sectors(bio
);
1082 while (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
1083 bio
->bi_iter
.bi_sector
< conf
->reshape_progress
&&
1084 bio
->bi_iter
.bi_sector
+ sectors
> conf
->reshape_progress
) {
1085 /* IO spans the reshape position. Need to wait for
1088 allow_barrier(conf
);
1089 wait_event(conf
->wait_barrier
,
1090 conf
->reshape_progress
<= bio
->bi_iter
.bi_sector
||
1091 conf
->reshape_progress
>= bio
->bi_iter
.bi_sector
+
1095 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
1096 bio_data_dir(bio
) == WRITE
&&
1097 (mddev
->reshape_backwards
1098 ? (bio
->bi_iter
.bi_sector
< conf
->reshape_safe
&&
1099 bio
->bi_iter
.bi_sector
+ sectors
> conf
->reshape_progress
)
1100 : (bio
->bi_iter
.bi_sector
+ sectors
> conf
->reshape_safe
&&
1101 bio
->bi_iter
.bi_sector
< conf
->reshape_progress
))) {
1102 /* Need to update reshape_position in metadata */
1103 mddev
->reshape_position
= conf
->reshape_progress
;
1104 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
1105 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
1106 md_wakeup_thread(mddev
->thread
);
1107 wait_event(mddev
->sb_wait
,
1108 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
1110 conf
->reshape_safe
= mddev
->reshape_position
;
1113 r10_bio
= mempool_alloc(conf
->r10bio_pool
, GFP_NOIO
);
1115 r10_bio
->master_bio
= bio
;
1116 r10_bio
->sectors
= sectors
;
1118 r10_bio
->mddev
= mddev
;
1119 r10_bio
->sector
= bio
->bi_iter
.bi_sector
;
1122 /* We might need to issue multiple reads to different
1123 * devices if there are bad blocks around, so we keep
1124 * track of the number of reads in bio->bi_phys_segments.
1125 * If this is 0, there is only one r10_bio and no locking
1126 * will be needed when the request completes. If it is
1127 * non-zero, then it is the number of not-completed requests.
1129 bio
->bi_phys_segments
= 0;
1130 bio_clear_flag(bio
, BIO_SEG_VALID
);
1134 * read balancing logic:
1136 struct md_rdev
*rdev
;
1140 rdev
= read_balance(conf
, r10_bio
, &max_sectors
);
1142 raid_end_bio_io(r10_bio
);
1145 slot
= r10_bio
->read_slot
;
1147 read_bio
= bio_clone_mddev(bio
, GFP_NOIO
, mddev
);
1148 bio_trim(read_bio
, r10_bio
->sector
- bio
->bi_iter
.bi_sector
,
1151 r10_bio
->devs
[slot
].bio
= read_bio
;
1152 r10_bio
->devs
[slot
].rdev
= rdev
;
1154 read_bio
->bi_iter
.bi_sector
= r10_bio
->devs
[slot
].addr
+
1155 choose_data_offset(r10_bio
, rdev
);
1156 read_bio
->bi_bdev
= rdev
->bdev
;
1157 read_bio
->bi_end_io
= raid10_end_read_request
;
1158 read_bio
->bi_rw
= READ
| do_sync
;
1159 read_bio
->bi_private
= r10_bio
;
1161 if (max_sectors
< r10_bio
->sectors
) {
1162 /* Could not read all from this device, so we will
1163 * need another r10_bio.
1165 sectors_handled
= (r10_bio
->sector
+ max_sectors
1166 - bio
->bi_iter
.bi_sector
);
1167 r10_bio
->sectors
= max_sectors
;
1168 spin_lock_irq(&conf
->device_lock
);
1169 if (bio
->bi_phys_segments
== 0)
1170 bio
->bi_phys_segments
= 2;
1172 bio
->bi_phys_segments
++;
1173 spin_unlock_irq(&conf
->device_lock
);
1174 /* Cannot call generic_make_request directly
1175 * as that will be queued in __generic_make_request
1176 * and subsequent mempool_alloc might block
1177 * waiting for it. so hand bio over to raid10d.
1179 reschedule_retry(r10_bio
);
1181 r10_bio
= mempool_alloc(conf
->r10bio_pool
, GFP_NOIO
);
1183 r10_bio
->master_bio
= bio
;
1184 r10_bio
->sectors
= bio_sectors(bio
) - sectors_handled
;
1186 r10_bio
->mddev
= mddev
;
1187 r10_bio
->sector
= bio
->bi_iter
.bi_sector
+
1191 generic_make_request(read_bio
);
1198 if (conf
->pending_count
>= max_queued_requests
) {
1199 md_wakeup_thread(mddev
->thread
);
1200 wait_event(conf
->wait_barrier
,
1201 conf
->pending_count
< max_queued_requests
);
1203 /* first select target devices under rcu_lock and
1204 * inc refcount on their rdev. Record them by setting
1206 * If there are known/acknowledged bad blocks on any device
1207 * on which we have seen a write error, we want to avoid
1208 * writing to those blocks. This potentially requires several
1209 * writes to write around the bad blocks. Each set of writes
1210 * gets its own r10_bio with a set of bios attached. The number
1211 * of r10_bios is recored in bio->bi_phys_segments just as with
1215 r10_bio
->read_slot
= -1; /* make sure repl_bio gets freed */
1216 raid10_find_phys(conf
, r10_bio
);
1218 blocked_rdev
= NULL
;
1220 max_sectors
= r10_bio
->sectors
;
1222 for (i
= 0; i
< conf
->copies
; i
++) {
1223 int d
= r10_bio
->devs
[i
].devnum
;
1224 struct md_rdev
*rdev
= rcu_dereference(conf
->mirrors
[d
].rdev
);
1225 struct md_rdev
*rrdev
= rcu_dereference(
1226 conf
->mirrors
[d
].replacement
);
1229 if (rdev
&& unlikely(test_bit(Blocked
, &rdev
->flags
))) {
1230 atomic_inc(&rdev
->nr_pending
);
1231 blocked_rdev
= rdev
;
1234 if (rrdev
&& unlikely(test_bit(Blocked
, &rrdev
->flags
))) {
1235 atomic_inc(&rrdev
->nr_pending
);
1236 blocked_rdev
= rrdev
;
1239 if (rdev
&& (test_bit(Faulty
, &rdev
->flags
)))
1241 if (rrdev
&& (test_bit(Faulty
, &rrdev
->flags
)))
1244 r10_bio
->devs
[i
].bio
= NULL
;
1245 r10_bio
->devs
[i
].repl_bio
= NULL
;
1247 if (!rdev
&& !rrdev
) {
1248 set_bit(R10BIO_Degraded
, &r10_bio
->state
);
1251 if (rdev
&& test_bit(WriteErrorSeen
, &rdev
->flags
)) {
1253 sector_t dev_sector
= r10_bio
->devs
[i
].addr
;
1257 is_bad
= is_badblock(rdev
, dev_sector
,
1259 &first_bad
, &bad_sectors
);
1261 /* Mustn't write here until the bad block
1264 atomic_inc(&rdev
->nr_pending
);
1265 set_bit(BlockedBadBlocks
, &rdev
->flags
);
1266 blocked_rdev
= rdev
;
1269 if (is_bad
&& first_bad
<= dev_sector
) {
1270 /* Cannot write here at all */
1271 bad_sectors
-= (dev_sector
- first_bad
);
1272 if (bad_sectors
< max_sectors
)
1273 /* Mustn't write more than bad_sectors
1274 * to other devices yet
1276 max_sectors
= bad_sectors
;
1277 /* We don't set R10BIO_Degraded as that
1278 * only applies if the disk is missing,
1279 * so it might be re-added, and we want to
1280 * know to recover this chunk.
1281 * In this case the device is here, and the
1282 * fact that this chunk is not in-sync is
1283 * recorded in the bad block log.
1288 int good_sectors
= first_bad
- dev_sector
;
1289 if (good_sectors
< max_sectors
)
1290 max_sectors
= good_sectors
;
1294 r10_bio
->devs
[i
].bio
= bio
;
1295 atomic_inc(&rdev
->nr_pending
);
1298 r10_bio
->devs
[i
].repl_bio
= bio
;
1299 atomic_inc(&rrdev
->nr_pending
);
1304 if (unlikely(blocked_rdev
)) {
1305 /* Have to wait for this device to get unblocked, then retry */
1309 for (j
= 0; j
< i
; j
++) {
1310 if (r10_bio
->devs
[j
].bio
) {
1311 d
= r10_bio
->devs
[j
].devnum
;
1312 rdev_dec_pending(conf
->mirrors
[d
].rdev
, mddev
);
1314 if (r10_bio
->devs
[j
].repl_bio
) {
1315 struct md_rdev
*rdev
;
1316 d
= r10_bio
->devs
[j
].devnum
;
1317 rdev
= conf
->mirrors
[d
].replacement
;
1319 /* Race with remove_disk */
1321 rdev
= conf
->mirrors
[d
].rdev
;
1323 rdev_dec_pending(rdev
, mddev
);
1326 allow_barrier(conf
);
1327 md_wait_for_blocked_rdev(blocked_rdev
, mddev
);
1332 if (max_sectors
< r10_bio
->sectors
) {
1333 /* We are splitting this into multiple parts, so
1334 * we need to prepare for allocating another r10_bio.
1336 r10_bio
->sectors
= max_sectors
;
1337 spin_lock_irq(&conf
->device_lock
);
1338 if (bio
->bi_phys_segments
== 0)
1339 bio
->bi_phys_segments
= 2;
1341 bio
->bi_phys_segments
++;
1342 spin_unlock_irq(&conf
->device_lock
);
1344 sectors_handled
= r10_bio
->sector
+ max_sectors
-
1345 bio
->bi_iter
.bi_sector
;
1347 atomic_set(&r10_bio
->remaining
, 1);
1348 bitmap_startwrite(mddev
->bitmap
, r10_bio
->sector
, r10_bio
->sectors
, 0);
1350 for (i
= 0; i
< conf
->copies
; i
++) {
1352 int d
= r10_bio
->devs
[i
].devnum
;
1353 if (r10_bio
->devs
[i
].bio
) {
1354 struct md_rdev
*rdev
= conf
->mirrors
[d
].rdev
;
1355 mbio
= bio_clone_mddev(bio
, GFP_NOIO
, mddev
);
1356 bio_trim(mbio
, r10_bio
->sector
- bio
->bi_iter
.bi_sector
,
1358 r10_bio
->devs
[i
].bio
= mbio
;
1360 mbio
->bi_iter
.bi_sector
= (r10_bio
->devs
[i
].addr
+
1361 choose_data_offset(r10_bio
,
1363 mbio
->bi_bdev
= rdev
->bdev
;
1364 mbio
->bi_end_io
= raid10_end_write_request
;
1366 WRITE
| do_sync
| do_fua
| do_discard
| do_same
;
1367 mbio
->bi_private
= r10_bio
;
1369 atomic_inc(&r10_bio
->remaining
);
1371 cb
= blk_check_plugged(raid10_unplug
, mddev
,
1374 plug
= container_of(cb
, struct raid10_plug_cb
,
1378 spin_lock_irqsave(&conf
->device_lock
, flags
);
1380 bio_list_add(&plug
->pending
, mbio
);
1381 plug
->pending_cnt
++;
1383 bio_list_add(&conf
->pending_bio_list
, mbio
);
1384 conf
->pending_count
++;
1386 spin_unlock_irqrestore(&conf
->device_lock
, flags
);
1388 md_wakeup_thread(mddev
->thread
);
1391 if (r10_bio
->devs
[i
].repl_bio
) {
1392 struct md_rdev
*rdev
= conf
->mirrors
[d
].replacement
;
1394 /* Replacement just got moved to main 'rdev' */
1396 rdev
= conf
->mirrors
[d
].rdev
;
1398 mbio
= bio_clone_mddev(bio
, GFP_NOIO
, mddev
);
1399 bio_trim(mbio
, r10_bio
->sector
- bio
->bi_iter
.bi_sector
,
1401 r10_bio
->devs
[i
].repl_bio
= mbio
;
1403 mbio
->bi_iter
.bi_sector
= (r10_bio
->devs
[i
].addr
+
1406 mbio
->bi_bdev
= rdev
->bdev
;
1407 mbio
->bi_end_io
= raid10_end_write_request
;
1409 WRITE
| do_sync
| do_fua
| do_discard
| do_same
;
1410 mbio
->bi_private
= r10_bio
;
1412 atomic_inc(&r10_bio
->remaining
);
1413 spin_lock_irqsave(&conf
->device_lock
, flags
);
1414 bio_list_add(&conf
->pending_bio_list
, mbio
);
1415 conf
->pending_count
++;
1416 spin_unlock_irqrestore(&conf
->device_lock
, flags
);
1417 if (!mddev_check_plugged(mddev
))
1418 md_wakeup_thread(mddev
->thread
);
1422 /* Don't remove the bias on 'remaining' (one_write_done) until
1423 * after checking if we need to go around again.
1426 if (sectors_handled
< bio_sectors(bio
)) {
1427 one_write_done(r10_bio
);
1428 /* We need another r10_bio. It has already been counted
1429 * in bio->bi_phys_segments.
1431 r10_bio
= mempool_alloc(conf
->r10bio_pool
, GFP_NOIO
);
1433 r10_bio
->master_bio
= bio
;
1434 r10_bio
->sectors
= bio_sectors(bio
) - sectors_handled
;
1436 r10_bio
->mddev
= mddev
;
1437 r10_bio
->sector
= bio
->bi_iter
.bi_sector
+ sectors_handled
;
1441 one_write_done(r10_bio
);
1444 static void make_request(struct mddev
*mddev
, struct bio
*bio
)
1446 struct r10conf
*conf
= mddev
->private;
1447 sector_t chunk_mask
= (conf
->geo
.chunk_mask
& conf
->prev
.chunk_mask
);
1448 int chunk_sects
= chunk_mask
+ 1;
1452 if (unlikely(bio
->bi_rw
& REQ_FLUSH
)) {
1453 md_flush_request(mddev
, bio
);
1457 md_write_start(mddev
, bio
);
1462 * If this request crosses a chunk boundary, we need to split
1465 if (unlikely((bio
->bi_iter
.bi_sector
& chunk_mask
) +
1466 bio_sectors(bio
) > chunk_sects
1467 && (conf
->geo
.near_copies
< conf
->geo
.raid_disks
1468 || conf
->prev
.near_copies
<
1469 conf
->prev
.raid_disks
))) {
1470 split
= bio_split(bio
, chunk_sects
-
1471 (bio
->bi_iter
.bi_sector
&
1473 GFP_NOIO
, fs_bio_set
);
1474 bio_chain(split
, bio
);
1479 __make_request(mddev
, split
);
1480 } while (split
!= bio
);
1482 /* In case raid10d snuck in to freeze_array */
1483 wake_up(&conf
->wait_barrier
);
1486 static void status(struct seq_file
*seq
, struct mddev
*mddev
)
1488 struct r10conf
*conf
= mddev
->private;
1491 if (conf
->geo
.near_copies
< conf
->geo
.raid_disks
)
1492 seq_printf(seq
, " %dK chunks", mddev
->chunk_sectors
/ 2);
1493 if (conf
->geo
.near_copies
> 1)
1494 seq_printf(seq
, " %d near-copies", conf
->geo
.near_copies
);
1495 if (conf
->geo
.far_copies
> 1) {
1496 if (conf
->geo
.far_offset
)
1497 seq_printf(seq
, " %d offset-copies", conf
->geo
.far_copies
);
1499 seq_printf(seq
, " %d far-copies", conf
->geo
.far_copies
);
1501 seq_printf(seq
, " [%d/%d] [", conf
->geo
.raid_disks
,
1502 conf
->geo
.raid_disks
- mddev
->degraded
);
1503 for (i
= 0; i
< conf
->geo
.raid_disks
; i
++)
1504 seq_printf(seq
, "%s",
1505 conf
->mirrors
[i
].rdev
&&
1506 test_bit(In_sync
, &conf
->mirrors
[i
].rdev
->flags
) ? "U" : "_");
1507 seq_printf(seq
, "]");
1510 /* check if there are enough drives for
1511 * every block to appear on atleast one.
1512 * Don't consider the device numbered 'ignore'
1513 * as we might be about to remove it.
1515 static int _enough(struct r10conf
*conf
, int previous
, int ignore
)
1521 disks
= conf
->prev
.raid_disks
;
1522 ncopies
= conf
->prev
.near_copies
;
1524 disks
= conf
->geo
.raid_disks
;
1525 ncopies
= conf
->geo
.near_copies
;
1530 int n
= conf
->copies
;
1534 struct md_rdev
*rdev
;
1535 if (this != ignore
&&
1536 (rdev
= rcu_dereference(conf
->mirrors
[this].rdev
)) &&
1537 test_bit(In_sync
, &rdev
->flags
))
1539 this = (this+1) % disks
;
1543 first
= (first
+ ncopies
) % disks
;
1544 } while (first
!= 0);
1551 static int enough(struct r10conf
*conf
, int ignore
)
1553 /* when calling 'enough', both 'prev' and 'geo' must
1555 * This is ensured if ->reconfig_mutex or ->device_lock
1558 return _enough(conf
, 0, ignore
) &&
1559 _enough(conf
, 1, ignore
);
1562 static void error(struct mddev
*mddev
, struct md_rdev
*rdev
)
1564 char b
[BDEVNAME_SIZE
];
1565 struct r10conf
*conf
= mddev
->private;
1566 unsigned long flags
;
1569 * If it is not operational, then we have already marked it as dead
1570 * else if it is the last working disks, ignore the error, let the
1571 * next level up know.
1572 * else mark the drive as failed
1574 spin_lock_irqsave(&conf
->device_lock
, flags
);
1575 if (test_bit(In_sync
, &rdev
->flags
)
1576 && !enough(conf
, rdev
->raid_disk
)) {
1578 * Don't fail the drive, just return an IO error.
1580 spin_unlock_irqrestore(&conf
->device_lock
, flags
);
1583 if (test_and_clear_bit(In_sync
, &rdev
->flags
))
1586 * If recovery is running, make sure it aborts.
1588 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
1589 set_bit(Blocked
, &rdev
->flags
);
1590 set_bit(Faulty
, &rdev
->flags
);
1591 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
1592 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
1593 spin_unlock_irqrestore(&conf
->device_lock
, flags
);
1595 "md/raid10:%s: Disk failure on %s, disabling device.\n"
1596 "md/raid10:%s: Operation continuing on %d devices.\n",
1597 mdname(mddev
), bdevname(rdev
->bdev
, b
),
1598 mdname(mddev
), conf
->geo
.raid_disks
- mddev
->degraded
);
1601 static void print_conf(struct r10conf
*conf
)
1604 struct raid10_info
*tmp
;
1606 printk(KERN_DEBUG
"RAID10 conf printout:\n");
1608 printk(KERN_DEBUG
"(!conf)\n");
1611 printk(KERN_DEBUG
" --- wd:%d rd:%d\n", conf
->geo
.raid_disks
- conf
->mddev
->degraded
,
1612 conf
->geo
.raid_disks
);
1614 for (i
= 0; i
< conf
->geo
.raid_disks
; i
++) {
1615 char b
[BDEVNAME_SIZE
];
1616 tmp
= conf
->mirrors
+ i
;
1618 printk(KERN_DEBUG
" disk %d, wo:%d, o:%d, dev:%s\n",
1619 i
, !test_bit(In_sync
, &tmp
->rdev
->flags
),
1620 !test_bit(Faulty
, &tmp
->rdev
->flags
),
1621 bdevname(tmp
->rdev
->bdev
,b
));
1625 static void close_sync(struct r10conf
*conf
)
1628 allow_barrier(conf
);
1630 mempool_destroy(conf
->r10buf_pool
);
1631 conf
->r10buf_pool
= NULL
;
1634 static int raid10_spare_active(struct mddev
*mddev
)
1637 struct r10conf
*conf
= mddev
->private;
1638 struct raid10_info
*tmp
;
1640 unsigned long flags
;
1643 * Find all non-in_sync disks within the RAID10 configuration
1644 * and mark them in_sync
1646 for (i
= 0; i
< conf
->geo
.raid_disks
; i
++) {
1647 tmp
= conf
->mirrors
+ i
;
1648 if (tmp
->replacement
1649 && tmp
->replacement
->recovery_offset
== MaxSector
1650 && !test_bit(Faulty
, &tmp
->replacement
->flags
)
1651 && !test_and_set_bit(In_sync
, &tmp
->replacement
->flags
)) {
1652 /* Replacement has just become active */
1654 || !test_and_clear_bit(In_sync
, &tmp
->rdev
->flags
))
1657 /* Replaced device not technically faulty,
1658 * but we need to be sure it gets removed
1659 * and never re-added.
1661 set_bit(Faulty
, &tmp
->rdev
->flags
);
1662 sysfs_notify_dirent_safe(
1663 tmp
->rdev
->sysfs_state
);
1665 sysfs_notify_dirent_safe(tmp
->replacement
->sysfs_state
);
1666 } else if (tmp
->rdev
1667 && tmp
->rdev
->recovery_offset
== MaxSector
1668 && !test_bit(Faulty
, &tmp
->rdev
->flags
)
1669 && !test_and_set_bit(In_sync
, &tmp
->rdev
->flags
)) {
1671 sysfs_notify_dirent_safe(tmp
->rdev
->sysfs_state
);
1674 spin_lock_irqsave(&conf
->device_lock
, flags
);
1675 mddev
->degraded
-= count
;
1676 spin_unlock_irqrestore(&conf
->device_lock
, flags
);
1682 static int raid10_add_disk(struct mddev
*mddev
, struct md_rdev
*rdev
)
1684 struct r10conf
*conf
= mddev
->private;
1688 int last
= conf
->geo
.raid_disks
- 1;
1690 if (mddev
->recovery_cp
< MaxSector
)
1691 /* only hot-add to in-sync arrays, as recovery is
1692 * very different from resync
1695 if (rdev
->saved_raid_disk
< 0 && !_enough(conf
, 1, -1))
1698 if (rdev
->raid_disk
>= 0)
1699 first
= last
= rdev
->raid_disk
;
1701 if (rdev
->saved_raid_disk
>= first
&&
1702 conf
->mirrors
[rdev
->saved_raid_disk
].rdev
== NULL
)
1703 mirror
= rdev
->saved_raid_disk
;
1706 for ( ; mirror
<= last
; mirror
++) {
1707 struct raid10_info
*p
= &conf
->mirrors
[mirror
];
1708 if (p
->recovery_disabled
== mddev
->recovery_disabled
)
1711 if (!test_bit(WantReplacement
, &p
->rdev
->flags
) ||
1712 p
->replacement
!= NULL
)
1714 clear_bit(In_sync
, &rdev
->flags
);
1715 set_bit(Replacement
, &rdev
->flags
);
1716 rdev
->raid_disk
= mirror
;
1719 disk_stack_limits(mddev
->gendisk
, rdev
->bdev
,
1720 rdev
->data_offset
<< 9);
1722 rcu_assign_pointer(p
->replacement
, rdev
);
1727 disk_stack_limits(mddev
->gendisk
, rdev
->bdev
,
1728 rdev
->data_offset
<< 9);
1730 p
->head_position
= 0;
1731 p
->recovery_disabled
= mddev
->recovery_disabled
- 1;
1732 rdev
->raid_disk
= mirror
;
1734 if (rdev
->saved_raid_disk
!= mirror
)
1736 rcu_assign_pointer(p
->rdev
, rdev
);
1739 md_integrity_add_rdev(rdev
, mddev
);
1740 if (mddev
->queue
&& blk_queue_discard(bdev_get_queue(rdev
->bdev
)))
1741 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD
, mddev
->queue
);
1747 static int raid10_remove_disk(struct mddev
*mddev
, struct md_rdev
*rdev
)
1749 struct r10conf
*conf
= mddev
->private;
1751 int number
= rdev
->raid_disk
;
1752 struct md_rdev
**rdevp
;
1753 struct raid10_info
*p
= conf
->mirrors
+ number
;
1756 if (rdev
== p
->rdev
)
1758 else if (rdev
== p
->replacement
)
1759 rdevp
= &p
->replacement
;
1763 if (test_bit(In_sync
, &rdev
->flags
) ||
1764 atomic_read(&rdev
->nr_pending
)) {
1768 /* Only remove faulty devices if recovery
1771 if (!test_bit(Faulty
, &rdev
->flags
) &&
1772 mddev
->recovery_disabled
!= p
->recovery_disabled
&&
1773 (!p
->replacement
|| p
->replacement
== rdev
) &&
1774 number
< conf
->geo
.raid_disks
&&
1781 if (atomic_read(&rdev
->nr_pending
)) {
1782 /* lost the race, try later */
1786 } else if (p
->replacement
) {
1787 /* We must have just cleared 'rdev' */
1788 p
->rdev
= p
->replacement
;
1789 clear_bit(Replacement
, &p
->replacement
->flags
);
1790 smp_mb(); /* Make sure other CPUs may see both as identical
1791 * but will never see neither -- if they are careful.
1793 p
->replacement
= NULL
;
1794 clear_bit(WantReplacement
, &rdev
->flags
);
1796 /* We might have just remove the Replacement as faulty
1797 * Clear the flag just in case
1799 clear_bit(WantReplacement
, &rdev
->flags
);
1801 err
= md_integrity_register(mddev
);
1809 static void end_sync_read(struct bio
*bio
)
1811 struct r10bio
*r10_bio
= bio
->bi_private
;
1812 struct r10conf
*conf
= r10_bio
->mddev
->private;
1815 if (bio
== r10_bio
->master_bio
) {
1816 /* this is a reshape read */
1817 d
= r10_bio
->read_slot
; /* really the read dev */
1819 d
= find_bio_disk(conf
, r10_bio
, bio
, NULL
, NULL
);
1822 set_bit(R10BIO_Uptodate
, &r10_bio
->state
);
1824 /* The write handler will notice the lack of
1825 * R10BIO_Uptodate and record any errors etc
1827 atomic_add(r10_bio
->sectors
,
1828 &conf
->mirrors
[d
].rdev
->corrected_errors
);
1830 /* for reconstruct, we always reschedule after a read.
1831 * for resync, only after all reads
1833 rdev_dec_pending(conf
->mirrors
[d
].rdev
, conf
->mddev
);
1834 if (test_bit(R10BIO_IsRecover
, &r10_bio
->state
) ||
1835 atomic_dec_and_test(&r10_bio
->remaining
)) {
1836 /* we have read all the blocks,
1837 * do the comparison in process context in raid10d
1839 reschedule_retry(r10_bio
);
1843 static void end_sync_request(struct r10bio
*r10_bio
)
1845 struct mddev
*mddev
= r10_bio
->mddev
;
1847 while (atomic_dec_and_test(&r10_bio
->remaining
)) {
1848 if (r10_bio
->master_bio
== NULL
) {
1849 /* the primary of several recovery bios */
1850 sector_t s
= r10_bio
->sectors
;
1851 if (test_bit(R10BIO_MadeGood
, &r10_bio
->state
) ||
1852 test_bit(R10BIO_WriteError
, &r10_bio
->state
))
1853 reschedule_retry(r10_bio
);
1856 md_done_sync(mddev
, s
, 1);
1859 struct r10bio
*r10_bio2
= (struct r10bio
*)r10_bio
->master_bio
;
1860 if (test_bit(R10BIO_MadeGood
, &r10_bio
->state
) ||
1861 test_bit(R10BIO_WriteError
, &r10_bio
->state
))
1862 reschedule_retry(r10_bio
);
1870 static void end_sync_write(struct bio
*bio
)
1872 struct r10bio
*r10_bio
= bio
->bi_private
;
1873 struct mddev
*mddev
= r10_bio
->mddev
;
1874 struct r10conf
*conf
= mddev
->private;
1880 struct md_rdev
*rdev
= NULL
;
1882 d
= find_bio_disk(conf
, r10_bio
, bio
, &slot
, &repl
);
1884 rdev
= conf
->mirrors
[d
].replacement
;
1886 rdev
= conf
->mirrors
[d
].rdev
;
1888 if (bio
->bi_error
) {
1890 md_error(mddev
, rdev
);
1892 set_bit(WriteErrorSeen
, &rdev
->flags
);
1893 if (!test_and_set_bit(WantReplacement
, &rdev
->flags
))
1894 set_bit(MD_RECOVERY_NEEDED
,
1895 &rdev
->mddev
->recovery
);
1896 set_bit(R10BIO_WriteError
, &r10_bio
->state
);
1898 } else if (is_badblock(rdev
,
1899 r10_bio
->devs
[slot
].addr
,
1901 &first_bad
, &bad_sectors
))
1902 set_bit(R10BIO_MadeGood
, &r10_bio
->state
);
1904 rdev_dec_pending(rdev
, mddev
);
1906 end_sync_request(r10_bio
);
1910 * Note: sync and recover and handled very differently for raid10
1911 * This code is for resync.
1912 * For resync, we read through virtual addresses and read all blocks.
1913 * If there is any error, we schedule a write. The lowest numbered
1914 * drive is authoritative.
1915 * However requests come for physical address, so we need to map.
1916 * For every physical address there are raid_disks/copies virtual addresses,
1917 * which is always are least one, but is not necessarly an integer.
1918 * This means that a physical address can span multiple chunks, so we may
1919 * have to submit multiple io requests for a single sync request.
1922 * We check if all blocks are in-sync and only write to blocks that
1925 static void sync_request_write(struct mddev
*mddev
, struct r10bio
*r10_bio
)
1927 struct r10conf
*conf
= mddev
->private;
1929 struct bio
*tbio
, *fbio
;
1932 atomic_set(&r10_bio
->remaining
, 1);
1934 /* find the first device with a block */
1935 for (i
=0; i
<conf
->copies
; i
++)
1936 if (!r10_bio
->devs
[i
].bio
->bi_error
)
1939 if (i
== conf
->copies
)
1943 fbio
= r10_bio
->devs
[i
].bio
;
1945 vcnt
= (r10_bio
->sectors
+ (PAGE_SIZE
>> 9) - 1) >> (PAGE_SHIFT
- 9);
1946 /* now find blocks with errors */
1947 for (i
=0 ; i
< conf
->copies
; i
++) {
1950 tbio
= r10_bio
->devs
[i
].bio
;
1952 if (tbio
->bi_end_io
!= end_sync_read
)
1956 if (!r10_bio
->devs
[i
].bio
->bi_error
) {
1957 /* We know that the bi_io_vec layout is the same for
1958 * both 'first' and 'i', so we just compare them.
1959 * All vec entries are PAGE_SIZE;
1961 int sectors
= r10_bio
->sectors
;
1962 for (j
= 0; j
< vcnt
; j
++) {
1963 int len
= PAGE_SIZE
;
1964 if (sectors
< (len
/ 512))
1965 len
= sectors
* 512;
1966 if (memcmp(page_address(fbio
->bi_io_vec
[j
].bv_page
),
1967 page_address(tbio
->bi_io_vec
[j
].bv_page
),
1974 atomic64_add(r10_bio
->sectors
, &mddev
->resync_mismatches
);
1975 if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
1976 /* Don't fix anything. */
1979 /* Ok, we need to write this bio, either to correct an
1980 * inconsistency or to correct an unreadable block.
1981 * First we need to fixup bv_offset, bv_len and
1982 * bi_vecs, as the read request might have corrupted these
1986 tbio
->bi_vcnt
= vcnt
;
1987 tbio
->bi_iter
.bi_size
= r10_bio
->sectors
<< 9;
1988 tbio
->bi_rw
= WRITE
;
1989 tbio
->bi_private
= r10_bio
;
1990 tbio
->bi_iter
.bi_sector
= r10_bio
->devs
[i
].addr
;
1991 tbio
->bi_end_io
= end_sync_write
;
1993 bio_copy_data(tbio
, fbio
);
1995 d
= r10_bio
->devs
[i
].devnum
;
1996 atomic_inc(&conf
->mirrors
[d
].rdev
->nr_pending
);
1997 atomic_inc(&r10_bio
->remaining
);
1998 md_sync_acct(conf
->mirrors
[d
].rdev
->bdev
, bio_sectors(tbio
));
2000 tbio
->bi_iter
.bi_sector
+= conf
->mirrors
[d
].rdev
->data_offset
;
2001 tbio
->bi_bdev
= conf
->mirrors
[d
].rdev
->bdev
;
2002 generic_make_request(tbio
);
2005 /* Now write out to any replacement devices
2008 for (i
= 0; i
< conf
->copies
; i
++) {
2011 tbio
= r10_bio
->devs
[i
].repl_bio
;
2012 if (!tbio
|| !tbio
->bi_end_io
)
2014 if (r10_bio
->devs
[i
].bio
->bi_end_io
!= end_sync_write
2015 && r10_bio
->devs
[i
].bio
!= fbio
)
2016 bio_copy_data(tbio
, fbio
);
2017 d
= r10_bio
->devs
[i
].devnum
;
2018 atomic_inc(&r10_bio
->remaining
);
2019 md_sync_acct(conf
->mirrors
[d
].replacement
->bdev
,
2021 generic_make_request(tbio
);
2025 if (atomic_dec_and_test(&r10_bio
->remaining
)) {
2026 md_done_sync(mddev
, r10_bio
->sectors
, 1);
2032 * Now for the recovery code.
2033 * Recovery happens across physical sectors.
2034 * We recover all non-is_sync drives by finding the virtual address of
2035 * each, and then choose a working drive that also has that virt address.
2036 * There is a separate r10_bio for each non-in_sync drive.
2037 * Only the first two slots are in use. The first for reading,
2038 * The second for writing.
2041 static void fix_recovery_read_error(struct r10bio
*r10_bio
)
2043 /* We got a read error during recovery.
2044 * We repeat the read in smaller page-sized sections.
2045 * If a read succeeds, write it to the new device or record
2046 * a bad block if we cannot.
2047 * If a read fails, record a bad block on both old and
2050 struct mddev
*mddev
= r10_bio
->mddev
;
2051 struct r10conf
*conf
= mddev
->private;
2052 struct bio
*bio
= r10_bio
->devs
[0].bio
;
2054 int sectors
= r10_bio
->sectors
;
2056 int dr
= r10_bio
->devs
[0].devnum
;
2057 int dw
= r10_bio
->devs
[1].devnum
;
2061 struct md_rdev
*rdev
;
2065 if (s
> (PAGE_SIZE
>>9))
2068 rdev
= conf
->mirrors
[dr
].rdev
;
2069 addr
= r10_bio
->devs
[0].addr
+ sect
,
2070 ok
= sync_page_io(rdev
,
2073 bio
->bi_io_vec
[idx
].bv_page
,
2076 rdev
= conf
->mirrors
[dw
].rdev
;
2077 addr
= r10_bio
->devs
[1].addr
+ sect
;
2078 ok
= sync_page_io(rdev
,
2081 bio
->bi_io_vec
[idx
].bv_page
,
2084 set_bit(WriteErrorSeen
, &rdev
->flags
);
2085 if (!test_and_set_bit(WantReplacement
,
2087 set_bit(MD_RECOVERY_NEEDED
,
2088 &rdev
->mddev
->recovery
);
2092 /* We don't worry if we cannot set a bad block -
2093 * it really is bad so there is no loss in not
2096 rdev_set_badblocks(rdev
, addr
, s
, 0);
2098 if (rdev
!= conf
->mirrors
[dw
].rdev
) {
2099 /* need bad block on destination too */
2100 struct md_rdev
*rdev2
= conf
->mirrors
[dw
].rdev
;
2101 addr
= r10_bio
->devs
[1].addr
+ sect
;
2102 ok
= rdev_set_badblocks(rdev2
, addr
, s
, 0);
2104 /* just abort the recovery */
2106 "md/raid10:%s: recovery aborted"
2107 " due to read error\n",
2110 conf
->mirrors
[dw
].recovery_disabled
2111 = mddev
->recovery_disabled
;
2112 set_bit(MD_RECOVERY_INTR
,
2125 static void recovery_request_write(struct mddev
*mddev
, struct r10bio
*r10_bio
)
2127 struct r10conf
*conf
= mddev
->private;
2129 struct bio
*wbio
, *wbio2
;
2131 if (!test_bit(R10BIO_Uptodate
, &r10_bio
->state
)) {
2132 fix_recovery_read_error(r10_bio
);
2133 end_sync_request(r10_bio
);
2138 * share the pages with the first bio
2139 * and submit the write request
2141 d
= r10_bio
->devs
[1].devnum
;
2142 wbio
= r10_bio
->devs
[1].bio
;
2143 wbio2
= r10_bio
->devs
[1].repl_bio
;
2144 /* Need to test wbio2->bi_end_io before we call
2145 * generic_make_request as if the former is NULL,
2146 * the latter is free to free wbio2.
2148 if (wbio2
&& !wbio2
->bi_end_io
)
2150 if (wbio
->bi_end_io
) {
2151 atomic_inc(&conf
->mirrors
[d
].rdev
->nr_pending
);
2152 md_sync_acct(conf
->mirrors
[d
].rdev
->bdev
, bio_sectors(wbio
));
2153 generic_make_request(wbio
);
2156 atomic_inc(&conf
->mirrors
[d
].replacement
->nr_pending
);
2157 md_sync_acct(conf
->mirrors
[d
].replacement
->bdev
,
2158 bio_sectors(wbio2
));
2159 generic_make_request(wbio2
);
2164 * Used by fix_read_error() to decay the per rdev read_errors.
2165 * We halve the read error count for every hour that has elapsed
2166 * since the last recorded read error.
2169 static void check_decay_read_errors(struct mddev
*mddev
, struct md_rdev
*rdev
)
2171 struct timespec cur_time_mon
;
2172 unsigned long hours_since_last
;
2173 unsigned int read_errors
= atomic_read(&rdev
->read_errors
);
2175 ktime_get_ts(&cur_time_mon
);
2177 if (rdev
->last_read_error
.tv_sec
== 0 &&
2178 rdev
->last_read_error
.tv_nsec
== 0) {
2179 /* first time we've seen a read error */
2180 rdev
->last_read_error
= cur_time_mon
;
2184 hours_since_last
= (cur_time_mon
.tv_sec
-
2185 rdev
->last_read_error
.tv_sec
) / 3600;
2187 rdev
->last_read_error
= cur_time_mon
;
2190 * if hours_since_last is > the number of bits in read_errors
2191 * just set read errors to 0. We do this to avoid
2192 * overflowing the shift of read_errors by hours_since_last.
2194 if (hours_since_last
>= 8 * sizeof(read_errors
))
2195 atomic_set(&rdev
->read_errors
, 0);
2197 atomic_set(&rdev
->read_errors
, read_errors
>> hours_since_last
);
2200 static int r10_sync_page_io(struct md_rdev
*rdev
, sector_t sector
,
2201 int sectors
, struct page
*page
, int rw
)
2206 if (is_badblock(rdev
, sector
, sectors
, &first_bad
, &bad_sectors
)
2207 && (rw
== READ
|| test_bit(WriteErrorSeen
, &rdev
->flags
)))
2209 if (sync_page_io(rdev
, sector
, sectors
<< 9, page
, rw
, false))
2213 set_bit(WriteErrorSeen
, &rdev
->flags
);
2214 if (!test_and_set_bit(WantReplacement
, &rdev
->flags
))
2215 set_bit(MD_RECOVERY_NEEDED
,
2216 &rdev
->mddev
->recovery
);
2218 /* need to record an error - either for the block or the device */
2219 if (!rdev_set_badblocks(rdev
, sector
, sectors
, 0))
2220 md_error(rdev
->mddev
, rdev
);
2225 * This is a kernel thread which:
2227 * 1. Retries failed read operations on working mirrors.
2228 * 2. Updates the raid superblock when problems encounter.
2229 * 3. Performs writes following reads for array synchronising.
2232 static void fix_read_error(struct r10conf
*conf
, struct mddev
*mddev
, struct r10bio
*r10_bio
)
2234 int sect
= 0; /* Offset from r10_bio->sector */
2235 int sectors
= r10_bio
->sectors
;
2236 struct md_rdev
*rdev
;
2237 int max_read_errors
= atomic_read(&mddev
->max_corr_read_errors
);
2238 int d
= r10_bio
->devs
[r10_bio
->read_slot
].devnum
;
2240 /* still own a reference to this rdev, so it cannot
2241 * have been cleared recently.
2243 rdev
= conf
->mirrors
[d
].rdev
;
2245 if (test_bit(Faulty
, &rdev
->flags
))
2246 /* drive has already been failed, just ignore any
2247 more fix_read_error() attempts */
2250 check_decay_read_errors(mddev
, rdev
);
2251 atomic_inc(&rdev
->read_errors
);
2252 if (atomic_read(&rdev
->read_errors
) > max_read_errors
) {
2253 char b
[BDEVNAME_SIZE
];
2254 bdevname(rdev
->bdev
, b
);
2257 "md/raid10:%s: %s: Raid device exceeded "
2258 "read_error threshold [cur %d:max %d]\n",
2260 atomic_read(&rdev
->read_errors
), max_read_errors
);
2262 "md/raid10:%s: %s: Failing raid device\n",
2264 md_error(mddev
, conf
->mirrors
[d
].rdev
);
2265 r10_bio
->devs
[r10_bio
->read_slot
].bio
= IO_BLOCKED
;
2271 int sl
= r10_bio
->read_slot
;
2275 if (s
> (PAGE_SIZE
>>9))
2283 d
= r10_bio
->devs
[sl
].devnum
;
2284 rdev
= rcu_dereference(conf
->mirrors
[d
].rdev
);
2286 test_bit(In_sync
, &rdev
->flags
) &&
2287 is_badblock(rdev
, r10_bio
->devs
[sl
].addr
+ sect
, s
,
2288 &first_bad
, &bad_sectors
) == 0) {
2289 atomic_inc(&rdev
->nr_pending
);
2291 success
= sync_page_io(rdev
,
2292 r10_bio
->devs
[sl
].addr
+
2295 conf
->tmppage
, READ
, false);
2296 rdev_dec_pending(rdev
, mddev
);
2302 if (sl
== conf
->copies
)
2304 } while (!success
&& sl
!= r10_bio
->read_slot
);
2308 /* Cannot read from anywhere, just mark the block
2309 * as bad on the first device to discourage future
2312 int dn
= r10_bio
->devs
[r10_bio
->read_slot
].devnum
;
2313 rdev
= conf
->mirrors
[dn
].rdev
;
2315 if (!rdev_set_badblocks(
2317 r10_bio
->devs
[r10_bio
->read_slot
].addr
2320 md_error(mddev
, rdev
);
2321 r10_bio
->devs
[r10_bio
->read_slot
].bio
2328 /* write it back and re-read */
2330 while (sl
!= r10_bio
->read_slot
) {
2331 char b
[BDEVNAME_SIZE
];
2336 d
= r10_bio
->devs
[sl
].devnum
;
2337 rdev
= rcu_dereference(conf
->mirrors
[d
].rdev
);
2339 !test_bit(In_sync
, &rdev
->flags
))
2342 atomic_inc(&rdev
->nr_pending
);
2344 if (r10_sync_page_io(rdev
,
2345 r10_bio
->devs
[sl
].addr
+
2347 s
, conf
->tmppage
, WRITE
)
2349 /* Well, this device is dead */
2351 "md/raid10:%s: read correction "
2353 " (%d sectors at %llu on %s)\n",
2355 (unsigned long long)(
2357 choose_data_offset(r10_bio
,
2359 bdevname(rdev
->bdev
, b
));
2360 printk(KERN_NOTICE
"md/raid10:%s: %s: failing "
2363 bdevname(rdev
->bdev
, b
));
2365 rdev_dec_pending(rdev
, mddev
);
2369 while (sl
!= r10_bio
->read_slot
) {
2370 char b
[BDEVNAME_SIZE
];
2375 d
= r10_bio
->devs
[sl
].devnum
;
2376 rdev
= rcu_dereference(conf
->mirrors
[d
].rdev
);
2378 !test_bit(In_sync
, &rdev
->flags
))
2381 atomic_inc(&rdev
->nr_pending
);
2383 switch (r10_sync_page_io(rdev
,
2384 r10_bio
->devs
[sl
].addr
+
2389 /* Well, this device is dead */
2391 "md/raid10:%s: unable to read back "
2393 " (%d sectors at %llu on %s)\n",
2395 (unsigned long long)(
2397 choose_data_offset(r10_bio
, rdev
)),
2398 bdevname(rdev
->bdev
, b
));
2399 printk(KERN_NOTICE
"md/raid10:%s: %s: failing "
2402 bdevname(rdev
->bdev
, b
));
2406 "md/raid10:%s: read error corrected"
2407 " (%d sectors at %llu on %s)\n",
2409 (unsigned long long)(
2411 choose_data_offset(r10_bio
, rdev
)),
2412 bdevname(rdev
->bdev
, b
));
2413 atomic_add(s
, &rdev
->corrected_errors
);
2416 rdev_dec_pending(rdev
, mddev
);
2426 static int narrow_write_error(struct r10bio
*r10_bio
, int i
)
2428 struct bio
*bio
= r10_bio
->master_bio
;
2429 struct mddev
*mddev
= r10_bio
->mddev
;
2430 struct r10conf
*conf
= mddev
->private;
2431 struct md_rdev
*rdev
= conf
->mirrors
[r10_bio
->devs
[i
].devnum
].rdev
;
2432 /* bio has the data to be written to slot 'i' where
2433 * we just recently had a write error.
2434 * We repeatedly clone the bio and trim down to one block,
2435 * then try the write. Where the write fails we record
2437 * It is conceivable that the bio doesn't exactly align with
2438 * blocks. We must handle this.
2440 * We currently own a reference to the rdev.
2446 int sect_to_write
= r10_bio
->sectors
;
2449 if (rdev
->badblocks
.shift
< 0)
2452 block_sectors
= roundup(1 << rdev
->badblocks
.shift
,
2453 bdev_logical_block_size(rdev
->bdev
) >> 9);
2454 sector
= r10_bio
->sector
;
2455 sectors
= ((r10_bio
->sector
+ block_sectors
)
2456 & ~(sector_t
)(block_sectors
- 1))
2459 while (sect_to_write
) {
2461 if (sectors
> sect_to_write
)
2462 sectors
= sect_to_write
;
2463 /* Write at 'sector' for 'sectors' */
2464 wbio
= bio_clone_mddev(bio
, GFP_NOIO
, mddev
);
2465 bio_trim(wbio
, sector
- bio
->bi_iter
.bi_sector
, sectors
);
2466 wbio
->bi_iter
.bi_sector
= (r10_bio
->devs
[i
].addr
+
2467 choose_data_offset(r10_bio
, rdev
) +
2468 (sector
- r10_bio
->sector
));
2469 wbio
->bi_bdev
= rdev
->bdev
;
2470 if (submit_bio_wait(WRITE
, wbio
) == 0)
2472 ok
= rdev_set_badblocks(rdev
, sector
,
2477 sect_to_write
-= sectors
;
2479 sectors
= block_sectors
;
2484 static void handle_read_error(struct mddev
*mddev
, struct r10bio
*r10_bio
)
2486 int slot
= r10_bio
->read_slot
;
2488 struct r10conf
*conf
= mddev
->private;
2489 struct md_rdev
*rdev
= r10_bio
->devs
[slot
].rdev
;
2490 char b
[BDEVNAME_SIZE
];
2491 unsigned long do_sync
;
2494 /* we got a read error. Maybe the drive is bad. Maybe just
2495 * the block and we can fix it.
2496 * We freeze all other IO, and try reading the block from
2497 * other devices. When we find one, we re-write
2498 * and check it that fixes the read error.
2499 * This is all done synchronously while the array is
2502 bio
= r10_bio
->devs
[slot
].bio
;
2503 bdevname(bio
->bi_bdev
, b
);
2505 r10_bio
->devs
[slot
].bio
= NULL
;
2507 if (mddev
->ro
== 0) {
2508 freeze_array(conf
, 1);
2509 fix_read_error(conf
, mddev
, r10_bio
);
2510 unfreeze_array(conf
);
2512 r10_bio
->devs
[slot
].bio
= IO_BLOCKED
;
2514 rdev_dec_pending(rdev
, mddev
);
2517 rdev
= read_balance(conf
, r10_bio
, &max_sectors
);
2519 printk(KERN_ALERT
"md/raid10:%s: %s: unrecoverable I/O"
2520 " read error for block %llu\n",
2522 (unsigned long long)r10_bio
->sector
);
2523 raid_end_bio_io(r10_bio
);
2527 do_sync
= (r10_bio
->master_bio
->bi_rw
& REQ_SYNC
);
2528 slot
= r10_bio
->read_slot
;
2531 "md/raid10:%s: %s: redirecting "
2532 "sector %llu to another mirror\n",
2534 bdevname(rdev
->bdev
, b
),
2535 (unsigned long long)r10_bio
->sector
);
2536 bio
= bio_clone_mddev(r10_bio
->master_bio
,
2538 bio_trim(bio
, r10_bio
->sector
- bio
->bi_iter
.bi_sector
, max_sectors
);
2539 r10_bio
->devs
[slot
].bio
= bio
;
2540 r10_bio
->devs
[slot
].rdev
= rdev
;
2541 bio
->bi_iter
.bi_sector
= r10_bio
->devs
[slot
].addr
2542 + choose_data_offset(r10_bio
, rdev
);
2543 bio
->bi_bdev
= rdev
->bdev
;
2544 bio
->bi_rw
= READ
| do_sync
;
2545 bio
->bi_private
= r10_bio
;
2546 bio
->bi_end_io
= raid10_end_read_request
;
2547 if (max_sectors
< r10_bio
->sectors
) {
2548 /* Drat - have to split this up more */
2549 struct bio
*mbio
= r10_bio
->master_bio
;
2550 int sectors_handled
=
2551 r10_bio
->sector
+ max_sectors
2552 - mbio
->bi_iter
.bi_sector
;
2553 r10_bio
->sectors
= max_sectors
;
2554 spin_lock_irq(&conf
->device_lock
);
2555 if (mbio
->bi_phys_segments
== 0)
2556 mbio
->bi_phys_segments
= 2;
2558 mbio
->bi_phys_segments
++;
2559 spin_unlock_irq(&conf
->device_lock
);
2560 generic_make_request(bio
);
2562 r10_bio
= mempool_alloc(conf
->r10bio_pool
,
2564 r10_bio
->master_bio
= mbio
;
2565 r10_bio
->sectors
= bio_sectors(mbio
) - sectors_handled
;
2567 set_bit(R10BIO_ReadError
,
2569 r10_bio
->mddev
= mddev
;
2570 r10_bio
->sector
= mbio
->bi_iter
.bi_sector
2575 generic_make_request(bio
);
2578 static void handle_write_completed(struct r10conf
*conf
, struct r10bio
*r10_bio
)
2580 /* Some sort of write request has finished and it
2581 * succeeded in writing where we thought there was a
2582 * bad block. So forget the bad block.
2583 * Or possibly if failed and we need to record
2587 struct md_rdev
*rdev
;
2589 if (test_bit(R10BIO_IsSync
, &r10_bio
->state
) ||
2590 test_bit(R10BIO_IsRecover
, &r10_bio
->state
)) {
2591 for (m
= 0; m
< conf
->copies
; m
++) {
2592 int dev
= r10_bio
->devs
[m
].devnum
;
2593 rdev
= conf
->mirrors
[dev
].rdev
;
2594 if (r10_bio
->devs
[m
].bio
== NULL
)
2596 if (!r10_bio
->devs
[m
].bio
->bi_error
) {
2597 rdev_clear_badblocks(
2599 r10_bio
->devs
[m
].addr
,
2600 r10_bio
->sectors
, 0);
2602 if (!rdev_set_badblocks(
2604 r10_bio
->devs
[m
].addr
,
2605 r10_bio
->sectors
, 0))
2606 md_error(conf
->mddev
, rdev
);
2608 rdev
= conf
->mirrors
[dev
].replacement
;
2609 if (r10_bio
->devs
[m
].repl_bio
== NULL
)
2612 if (!r10_bio
->devs
[m
].repl_bio
->bi_error
) {
2613 rdev_clear_badblocks(
2615 r10_bio
->devs
[m
].addr
,
2616 r10_bio
->sectors
, 0);
2618 if (!rdev_set_badblocks(
2620 r10_bio
->devs
[m
].addr
,
2621 r10_bio
->sectors
, 0))
2622 md_error(conf
->mddev
, rdev
);
2628 for (m
= 0; m
< conf
->copies
; m
++) {
2629 int dev
= r10_bio
->devs
[m
].devnum
;
2630 struct bio
*bio
= r10_bio
->devs
[m
].bio
;
2631 rdev
= conf
->mirrors
[dev
].rdev
;
2632 if (bio
== IO_MADE_GOOD
) {
2633 rdev_clear_badblocks(
2635 r10_bio
->devs
[m
].addr
,
2636 r10_bio
->sectors
, 0);
2637 rdev_dec_pending(rdev
, conf
->mddev
);
2638 } else if (bio
!= NULL
&& bio
->bi_error
) {
2640 if (!narrow_write_error(r10_bio
, m
)) {
2641 md_error(conf
->mddev
, rdev
);
2642 set_bit(R10BIO_Degraded
,
2645 rdev_dec_pending(rdev
, conf
->mddev
);
2647 bio
= r10_bio
->devs
[m
].repl_bio
;
2648 rdev
= conf
->mirrors
[dev
].replacement
;
2649 if (rdev
&& bio
== IO_MADE_GOOD
) {
2650 rdev_clear_badblocks(
2652 r10_bio
->devs
[m
].addr
,
2653 r10_bio
->sectors
, 0);
2654 rdev_dec_pending(rdev
, conf
->mddev
);
2657 if (test_bit(R10BIO_WriteError
,
2659 close_write(r10_bio
);
2661 spin_lock_irq(&conf
->device_lock
);
2662 list_add(&r10_bio
->retry_list
, &conf
->bio_end_io_list
);
2663 spin_unlock_irq(&conf
->device_lock
);
2664 md_wakeup_thread(conf
->mddev
->thread
);
2666 raid_end_bio_io(r10_bio
);
2670 static void raid10d(struct md_thread
*thread
)
2672 struct mddev
*mddev
= thread
->mddev
;
2673 struct r10bio
*r10_bio
;
2674 unsigned long flags
;
2675 struct r10conf
*conf
= mddev
->private;
2676 struct list_head
*head
= &conf
->retry_list
;
2677 struct blk_plug plug
;
2679 md_check_recovery(mddev
);
2681 if (!list_empty_careful(&conf
->bio_end_io_list
) &&
2682 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
)) {
2684 spin_lock_irqsave(&conf
->device_lock
, flags
);
2685 if (!test_bit(MD_CHANGE_PENDING
, &mddev
->flags
)) {
2686 list_add(&tmp
, &conf
->bio_end_io_list
);
2687 list_del_init(&conf
->bio_end_io_list
);
2689 spin_unlock_irqrestore(&conf
->device_lock
, flags
);
2690 while (!list_empty(&tmp
)) {
2691 r10_bio
= list_first_entry(&conf
->bio_end_io_list
,
2692 struct r10bio
, retry_list
);
2693 list_del(&r10_bio
->retry_list
);
2694 raid_end_bio_io(r10_bio
);
2698 blk_start_plug(&plug
);
2701 flush_pending_writes(conf
);
2703 spin_lock_irqsave(&conf
->device_lock
, flags
);
2704 if (list_empty(head
)) {
2705 spin_unlock_irqrestore(&conf
->device_lock
, flags
);
2708 r10_bio
= list_entry(head
->prev
, struct r10bio
, retry_list
);
2709 list_del(head
->prev
);
2711 spin_unlock_irqrestore(&conf
->device_lock
, flags
);
2713 mddev
= r10_bio
->mddev
;
2714 conf
= mddev
->private;
2715 if (test_bit(R10BIO_MadeGood
, &r10_bio
->state
) ||
2716 test_bit(R10BIO_WriteError
, &r10_bio
->state
))
2717 handle_write_completed(conf
, r10_bio
);
2718 else if (test_bit(R10BIO_IsReshape
, &r10_bio
->state
))
2719 reshape_request_write(mddev
, r10_bio
);
2720 else if (test_bit(R10BIO_IsSync
, &r10_bio
->state
))
2721 sync_request_write(mddev
, r10_bio
);
2722 else if (test_bit(R10BIO_IsRecover
, &r10_bio
->state
))
2723 recovery_request_write(mddev
, r10_bio
);
2724 else if (test_bit(R10BIO_ReadError
, &r10_bio
->state
))
2725 handle_read_error(mddev
, r10_bio
);
2727 /* just a partial read to be scheduled from a
2730 int slot
= r10_bio
->read_slot
;
2731 generic_make_request(r10_bio
->devs
[slot
].bio
);
2735 if (mddev
->flags
& ~(1<<MD_CHANGE_PENDING
))
2736 md_check_recovery(mddev
);
2738 blk_finish_plug(&plug
);
2741 static int init_resync(struct r10conf
*conf
)
2746 buffs
= RESYNC_WINDOW
/ RESYNC_BLOCK_SIZE
;
2747 BUG_ON(conf
->r10buf_pool
);
2748 conf
->have_replacement
= 0;
2749 for (i
= 0; i
< conf
->geo
.raid_disks
; i
++)
2750 if (conf
->mirrors
[i
].replacement
)
2751 conf
->have_replacement
= 1;
2752 conf
->r10buf_pool
= mempool_create(buffs
, r10buf_pool_alloc
, r10buf_pool_free
, conf
);
2753 if (!conf
->r10buf_pool
)
2755 conf
->next_resync
= 0;
2760 * perform a "sync" on one "block"
2762 * We need to make sure that no normal I/O request - particularly write
2763 * requests - conflict with active sync requests.
2765 * This is achieved by tracking pending requests and a 'barrier' concept
2766 * that can be installed to exclude normal IO requests.
2768 * Resync and recovery are handled very differently.
2769 * We differentiate by looking at MD_RECOVERY_SYNC in mddev->recovery.
2771 * For resync, we iterate over virtual addresses, read all copies,
2772 * and update if there are differences. If only one copy is live,
2774 * For recovery, we iterate over physical addresses, read a good
2775 * value for each non-in_sync drive, and over-write.
2777 * So, for recovery we may have several outstanding complex requests for a
2778 * given address, one for each out-of-sync device. We model this by allocating
2779 * a number of r10_bio structures, one for each out-of-sync device.
2780 * As we setup these structures, we collect all bio's together into a list
2781 * which we then process collectively to add pages, and then process again
2782 * to pass to generic_make_request.
2784 * The r10_bio structures are linked using a borrowed master_bio pointer.
2785 * This link is counted in ->remaining. When the r10_bio that points to NULL
2786 * has its remaining count decremented to 0, the whole complex operation
2791 static sector_t
sync_request(struct mddev
*mddev
, sector_t sector_nr
,
2794 struct r10conf
*conf
= mddev
->private;
2795 struct r10bio
*r10_bio
;
2796 struct bio
*biolist
= NULL
, *bio
;
2797 sector_t max_sector
, nr_sectors
;
2800 sector_t sync_blocks
;
2801 sector_t sectors_skipped
= 0;
2802 int chunks_skipped
= 0;
2803 sector_t chunk_mask
= conf
->geo
.chunk_mask
;
2805 if (!conf
->r10buf_pool
)
2806 if (init_resync(conf
))
2810 * Allow skipping a full rebuild for incremental assembly
2811 * of a clean array, like RAID1 does.
2813 if (mddev
->bitmap
== NULL
&&
2814 mddev
->recovery_cp
== MaxSector
&&
2815 mddev
->reshape_position
== MaxSector
&&
2816 !test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) &&
2817 !test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
) &&
2818 !test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
2819 conf
->fullsync
== 0) {
2821 return mddev
->dev_sectors
- sector_nr
;
2825 max_sector
= mddev
->dev_sectors
;
2826 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
2827 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
2828 max_sector
= mddev
->resync_max_sectors
;
2829 if (sector_nr
>= max_sector
) {
2830 /* If we aborted, we need to abort the
2831 * sync on the 'current' bitmap chucks (there can
2832 * be several when recovering multiple devices).
2833 * as we may have started syncing it but not finished.
2834 * We can find the current address in
2835 * mddev->curr_resync, but for recovery,
2836 * we need to convert that to several
2837 * virtual addresses.
2839 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)) {
2845 if (mddev
->curr_resync
< max_sector
) { /* aborted */
2846 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
2847 bitmap_end_sync(mddev
->bitmap
, mddev
->curr_resync
,
2849 else for (i
= 0; i
< conf
->geo
.raid_disks
; i
++) {
2851 raid10_find_virt(conf
, mddev
->curr_resync
, i
);
2852 bitmap_end_sync(mddev
->bitmap
, sect
,
2856 /* completed sync */
2857 if ((!mddev
->bitmap
|| conf
->fullsync
)
2858 && conf
->have_replacement
2859 && test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
2860 /* Completed a full sync so the replacements
2861 * are now fully recovered.
2863 for (i
= 0; i
< conf
->geo
.raid_disks
; i
++)
2864 if (conf
->mirrors
[i
].replacement
)
2865 conf
->mirrors
[i
].replacement
2871 bitmap_close_sync(mddev
->bitmap
);
2874 return sectors_skipped
;
2877 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
2878 return reshape_request(mddev
, sector_nr
, skipped
);
2880 if (chunks_skipped
>= conf
->geo
.raid_disks
) {
2881 /* if there has been nothing to do on any drive,
2882 * then there is nothing to do at all..
2885 return (max_sector
- sector_nr
) + sectors_skipped
;
2888 if (max_sector
> mddev
->resync_max
)
2889 max_sector
= mddev
->resync_max
; /* Don't do IO beyond here */
2891 /* make sure whole request will fit in a chunk - if chunks
2894 if (conf
->geo
.near_copies
< conf
->geo
.raid_disks
&&
2895 max_sector
> (sector_nr
| chunk_mask
))
2896 max_sector
= (sector_nr
| chunk_mask
) + 1;
2898 /* Again, very different code for resync and recovery.
2899 * Both must result in an r10bio with a list of bios that
2900 * have bi_end_io, bi_sector, bi_bdev set,
2901 * and bi_private set to the r10bio.
2902 * For recovery, we may actually create several r10bios
2903 * with 2 bios in each, that correspond to the bios in the main one.
2904 * In this case, the subordinate r10bios link back through a
2905 * borrowed master_bio pointer, and the counter in the master
2906 * includes a ref from each subordinate.
2908 /* First, we decide what to do and set ->bi_end_io
2909 * To end_sync_read if we want to read, and
2910 * end_sync_write if we will want to write.
2913 max_sync
= RESYNC_PAGES
<< (PAGE_SHIFT
-9);
2914 if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
2915 /* recovery... the complicated one */
2919 for (i
= 0 ; i
< conf
->geo
.raid_disks
; i
++) {
2925 struct raid10_info
*mirror
= &conf
->mirrors
[i
];
2927 if ((mirror
->rdev
== NULL
||
2928 test_bit(In_sync
, &mirror
->rdev
->flags
))
2930 (mirror
->replacement
== NULL
||
2932 &mirror
->replacement
->flags
)))
2936 /* want to reconstruct this device */
2938 sect
= raid10_find_virt(conf
, sector_nr
, i
);
2939 if (sect
>= mddev
->resync_max_sectors
) {
2940 /* last stripe is not complete - don't
2941 * try to recover this sector.
2945 /* Unless we are doing a full sync, or a replacement
2946 * we only need to recover the block if it is set in
2949 must_sync
= bitmap_start_sync(mddev
->bitmap
, sect
,
2951 if (sync_blocks
< max_sync
)
2952 max_sync
= sync_blocks
;
2954 mirror
->replacement
== NULL
&&
2956 /* yep, skip the sync_blocks here, but don't assume
2957 * that there will never be anything to do here
2959 chunks_skipped
= -1;
2963 r10_bio
= mempool_alloc(conf
->r10buf_pool
, GFP_NOIO
);
2965 raise_barrier(conf
, rb2
!= NULL
);
2966 atomic_set(&r10_bio
->remaining
, 0);
2968 r10_bio
->master_bio
= (struct bio
*)rb2
;
2970 atomic_inc(&rb2
->remaining
);
2971 r10_bio
->mddev
= mddev
;
2972 set_bit(R10BIO_IsRecover
, &r10_bio
->state
);
2973 r10_bio
->sector
= sect
;
2975 raid10_find_phys(conf
, r10_bio
);
2977 /* Need to check if the array will still be
2980 for (j
= 0; j
< conf
->geo
.raid_disks
; j
++)
2981 if (conf
->mirrors
[j
].rdev
== NULL
||
2982 test_bit(Faulty
, &conf
->mirrors
[j
].rdev
->flags
)) {
2987 must_sync
= bitmap_start_sync(mddev
->bitmap
, sect
,
2988 &sync_blocks
, still_degraded
);
2991 for (j
=0; j
<conf
->copies
;j
++) {
2993 int d
= r10_bio
->devs
[j
].devnum
;
2994 sector_t from_addr
, to_addr
;
2995 struct md_rdev
*rdev
;
2996 sector_t sector
, first_bad
;
2998 if (!conf
->mirrors
[d
].rdev
||
2999 !test_bit(In_sync
, &conf
->mirrors
[d
].rdev
->flags
))
3001 /* This is where we read from */
3003 rdev
= conf
->mirrors
[d
].rdev
;
3004 sector
= r10_bio
->devs
[j
].addr
;
3006 if (is_badblock(rdev
, sector
, max_sync
,
3007 &first_bad
, &bad_sectors
)) {
3008 if (first_bad
> sector
)
3009 max_sync
= first_bad
- sector
;
3011 bad_sectors
-= (sector
3013 if (max_sync
> bad_sectors
)
3014 max_sync
= bad_sectors
;
3018 bio
= r10_bio
->devs
[0].bio
;
3020 bio
->bi_next
= biolist
;
3022 bio
->bi_private
= r10_bio
;
3023 bio
->bi_end_io
= end_sync_read
;
3025 from_addr
= r10_bio
->devs
[j
].addr
;
3026 bio
->bi_iter
.bi_sector
= from_addr
+
3028 bio
->bi_bdev
= rdev
->bdev
;
3029 atomic_inc(&rdev
->nr_pending
);
3030 /* and we write to 'i' (if not in_sync) */
3032 for (k
=0; k
<conf
->copies
; k
++)
3033 if (r10_bio
->devs
[k
].devnum
== i
)
3035 BUG_ON(k
== conf
->copies
);
3036 to_addr
= r10_bio
->devs
[k
].addr
;
3037 r10_bio
->devs
[0].devnum
= d
;
3038 r10_bio
->devs
[0].addr
= from_addr
;
3039 r10_bio
->devs
[1].devnum
= i
;
3040 r10_bio
->devs
[1].addr
= to_addr
;
3042 rdev
= mirror
->rdev
;
3043 if (!test_bit(In_sync
, &rdev
->flags
)) {
3044 bio
= r10_bio
->devs
[1].bio
;
3046 bio
->bi_next
= biolist
;
3048 bio
->bi_private
= r10_bio
;
3049 bio
->bi_end_io
= end_sync_write
;
3051 bio
->bi_iter
.bi_sector
= to_addr
3052 + rdev
->data_offset
;
3053 bio
->bi_bdev
= rdev
->bdev
;
3054 atomic_inc(&r10_bio
->remaining
);
3056 r10_bio
->devs
[1].bio
->bi_end_io
= NULL
;
3058 /* and maybe write to replacement */
3059 bio
= r10_bio
->devs
[1].repl_bio
;
3061 bio
->bi_end_io
= NULL
;
3062 rdev
= mirror
->replacement
;
3063 /* Note: if rdev != NULL, then bio
3064 * cannot be NULL as r10buf_pool_alloc will
3065 * have allocated it.
3066 * So the second test here is pointless.
3067 * But it keeps semantic-checkers happy, and
3068 * this comment keeps human reviewers
3071 if (rdev
== NULL
|| bio
== NULL
||
3072 test_bit(Faulty
, &rdev
->flags
))
3075 bio
->bi_next
= biolist
;
3077 bio
->bi_private
= r10_bio
;
3078 bio
->bi_end_io
= end_sync_write
;
3080 bio
->bi_iter
.bi_sector
= to_addr
+
3082 bio
->bi_bdev
= rdev
->bdev
;
3083 atomic_inc(&r10_bio
->remaining
);
3086 if (j
== conf
->copies
) {
3087 /* Cannot recover, so abort the recovery or
3088 * record a bad block */
3090 /* problem is that there are bad blocks
3091 * on other device(s)
3094 for (k
= 0; k
< conf
->copies
; k
++)
3095 if (r10_bio
->devs
[k
].devnum
== i
)
3097 if (!test_bit(In_sync
,
3098 &mirror
->rdev
->flags
)
3099 && !rdev_set_badblocks(
3101 r10_bio
->devs
[k
].addr
,
3104 if (mirror
->replacement
&&
3105 !rdev_set_badblocks(
3106 mirror
->replacement
,
3107 r10_bio
->devs
[k
].addr
,
3112 if (!test_and_set_bit(MD_RECOVERY_INTR
,
3114 printk(KERN_INFO
"md/raid10:%s: insufficient "
3115 "working devices for recovery.\n",
3117 mirror
->recovery_disabled
3118 = mddev
->recovery_disabled
;
3122 atomic_dec(&rb2
->remaining
);
3127 if (biolist
== NULL
) {
3129 struct r10bio
*rb2
= r10_bio
;
3130 r10_bio
= (struct r10bio
*) rb2
->master_bio
;
3131 rb2
->master_bio
= NULL
;
3137 /* resync. Schedule a read for every block at this virt offset */
3140 bitmap_cond_end_sync(mddev
->bitmap
, sector_nr
);
3142 if (!bitmap_start_sync(mddev
->bitmap
, sector_nr
,
3143 &sync_blocks
, mddev
->degraded
) &&
3144 !conf
->fullsync
&& !test_bit(MD_RECOVERY_REQUESTED
,
3145 &mddev
->recovery
)) {
3146 /* We can skip this block */
3148 return sync_blocks
+ sectors_skipped
;
3150 if (sync_blocks
< max_sync
)
3151 max_sync
= sync_blocks
;
3152 r10_bio
= mempool_alloc(conf
->r10buf_pool
, GFP_NOIO
);
3155 r10_bio
->mddev
= mddev
;
3156 atomic_set(&r10_bio
->remaining
, 0);
3157 raise_barrier(conf
, 0);
3158 conf
->next_resync
= sector_nr
;
3160 r10_bio
->master_bio
= NULL
;
3161 r10_bio
->sector
= sector_nr
;
3162 set_bit(R10BIO_IsSync
, &r10_bio
->state
);
3163 raid10_find_phys(conf
, r10_bio
);
3164 r10_bio
->sectors
= (sector_nr
| chunk_mask
) - sector_nr
+ 1;
3166 for (i
= 0; i
< conf
->copies
; i
++) {
3167 int d
= r10_bio
->devs
[i
].devnum
;
3168 sector_t first_bad
, sector
;
3171 if (r10_bio
->devs
[i
].repl_bio
)
3172 r10_bio
->devs
[i
].repl_bio
->bi_end_io
= NULL
;
3174 bio
= r10_bio
->devs
[i
].bio
;
3176 bio
->bi_error
= -EIO
;
3177 if (conf
->mirrors
[d
].rdev
== NULL
||
3178 test_bit(Faulty
, &conf
->mirrors
[d
].rdev
->flags
))
3180 sector
= r10_bio
->devs
[i
].addr
;
3181 if (is_badblock(conf
->mirrors
[d
].rdev
,
3183 &first_bad
, &bad_sectors
)) {
3184 if (first_bad
> sector
)
3185 max_sync
= first_bad
- sector
;
3187 bad_sectors
-= (sector
- first_bad
);
3188 if (max_sync
> bad_sectors
)
3189 max_sync
= bad_sectors
;
3193 atomic_inc(&conf
->mirrors
[d
].rdev
->nr_pending
);
3194 atomic_inc(&r10_bio
->remaining
);
3195 bio
->bi_next
= biolist
;
3197 bio
->bi_private
= r10_bio
;
3198 bio
->bi_end_io
= end_sync_read
;
3200 bio
->bi_iter
.bi_sector
= sector
+
3201 conf
->mirrors
[d
].rdev
->data_offset
;
3202 bio
->bi_bdev
= conf
->mirrors
[d
].rdev
->bdev
;
3205 if (conf
->mirrors
[d
].replacement
== NULL
||
3207 &conf
->mirrors
[d
].replacement
->flags
))
3210 /* Need to set up for writing to the replacement */
3211 bio
= r10_bio
->devs
[i
].repl_bio
;
3213 bio
->bi_error
= -EIO
;
3215 sector
= r10_bio
->devs
[i
].addr
;
3216 atomic_inc(&conf
->mirrors
[d
].rdev
->nr_pending
);
3217 bio
->bi_next
= biolist
;
3219 bio
->bi_private
= r10_bio
;
3220 bio
->bi_end_io
= end_sync_write
;
3222 bio
->bi_iter
.bi_sector
= sector
+
3223 conf
->mirrors
[d
].replacement
->data_offset
;
3224 bio
->bi_bdev
= conf
->mirrors
[d
].replacement
->bdev
;
3229 for (i
=0; i
<conf
->copies
; i
++) {
3230 int d
= r10_bio
->devs
[i
].devnum
;
3231 if (r10_bio
->devs
[i
].bio
->bi_end_io
)
3232 rdev_dec_pending(conf
->mirrors
[d
].rdev
,
3234 if (r10_bio
->devs
[i
].repl_bio
&&
3235 r10_bio
->devs
[i
].repl_bio
->bi_end_io
)
3237 conf
->mirrors
[d
].replacement
,
3247 if (sector_nr
+ max_sync
< max_sector
)
3248 max_sector
= sector_nr
+ max_sync
;
3251 int len
= PAGE_SIZE
;
3252 if (sector_nr
+ (len
>>9) > max_sector
)
3253 len
= (max_sector
- sector_nr
) << 9;
3256 for (bio
= biolist
; bio
; bio
=bio
->bi_next
) {
3258 page
= bio
->bi_io_vec
[bio
->bi_vcnt
].bv_page
;
3259 if (bio_add_page(bio
, page
, len
, 0))
3263 bio
->bi_io_vec
[bio
->bi_vcnt
].bv_page
= page
;
3264 for (bio2
= biolist
;
3265 bio2
&& bio2
!= bio
;
3266 bio2
= bio2
->bi_next
) {
3267 /* remove last page from this bio */
3269 bio2
->bi_iter
.bi_size
-= len
;
3270 bio_clear_flag(bio2
, BIO_SEG_VALID
);
3274 nr_sectors
+= len
>>9;
3275 sector_nr
+= len
>>9;
3276 } while (biolist
->bi_vcnt
< RESYNC_PAGES
);
3278 r10_bio
->sectors
= nr_sectors
;
3282 biolist
= biolist
->bi_next
;
3284 bio
->bi_next
= NULL
;
3285 r10_bio
= bio
->bi_private
;
3286 r10_bio
->sectors
= nr_sectors
;
3288 if (bio
->bi_end_io
== end_sync_read
) {
3289 md_sync_acct(bio
->bi_bdev
, nr_sectors
);
3291 generic_make_request(bio
);
3295 if (sectors_skipped
)
3296 /* pretend they weren't skipped, it makes
3297 * no important difference in this case
3299 md_done_sync(mddev
, sectors_skipped
, 1);
3301 return sectors_skipped
+ nr_sectors
;
3303 /* There is nowhere to write, so all non-sync
3304 * drives must be failed or in resync, all drives
3305 * have a bad block, so try the next chunk...
3307 if (sector_nr
+ max_sync
< max_sector
)
3308 max_sector
= sector_nr
+ max_sync
;
3310 sectors_skipped
+= (max_sector
- sector_nr
);
3312 sector_nr
= max_sector
;
3317 raid10_size(struct mddev
*mddev
, sector_t sectors
, int raid_disks
)
3320 struct r10conf
*conf
= mddev
->private;
3323 raid_disks
= min(conf
->geo
.raid_disks
,
3324 conf
->prev
.raid_disks
);
3326 sectors
= conf
->dev_sectors
;
3328 size
= sectors
>> conf
->geo
.chunk_shift
;
3329 sector_div(size
, conf
->geo
.far_copies
);
3330 size
= size
* raid_disks
;
3331 sector_div(size
, conf
->geo
.near_copies
);
3333 return size
<< conf
->geo
.chunk_shift
;
3336 static void calc_sectors(struct r10conf
*conf
, sector_t size
)
3338 /* Calculate the number of sectors-per-device that will
3339 * actually be used, and set conf->dev_sectors and
3343 size
= size
>> conf
->geo
.chunk_shift
;
3344 sector_div(size
, conf
->geo
.far_copies
);
3345 size
= size
* conf
->geo
.raid_disks
;
3346 sector_div(size
, conf
->geo
.near_copies
);
3347 /* 'size' is now the number of chunks in the array */
3348 /* calculate "used chunks per device" */
3349 size
= size
* conf
->copies
;
3351 /* We need to round up when dividing by raid_disks to
3352 * get the stride size.
3354 size
= DIV_ROUND_UP_SECTOR_T(size
, conf
->geo
.raid_disks
);
3356 conf
->dev_sectors
= size
<< conf
->geo
.chunk_shift
;
3358 if (conf
->geo
.far_offset
)
3359 conf
->geo
.stride
= 1 << conf
->geo
.chunk_shift
;
3361 sector_div(size
, conf
->geo
.far_copies
);
3362 conf
->geo
.stride
= size
<< conf
->geo
.chunk_shift
;
3366 enum geo_type
{geo_new
, geo_old
, geo_start
};
3367 static int setup_geo(struct geom
*geo
, struct mddev
*mddev
, enum geo_type
new)
3370 int layout
, chunk
, disks
;
3373 layout
= mddev
->layout
;
3374 chunk
= mddev
->chunk_sectors
;
3375 disks
= mddev
->raid_disks
- mddev
->delta_disks
;
3378 layout
= mddev
->new_layout
;
3379 chunk
= mddev
->new_chunk_sectors
;
3380 disks
= mddev
->raid_disks
;
3382 default: /* avoid 'may be unused' warnings */
3383 case geo_start
: /* new when starting reshape - raid_disks not
3385 layout
= mddev
->new_layout
;
3386 chunk
= mddev
->new_chunk_sectors
;
3387 disks
= mddev
->raid_disks
+ mddev
->delta_disks
;
3392 if (chunk
< (PAGE_SIZE
>> 9) ||
3393 !is_power_of_2(chunk
))
3396 fc
= (layout
>> 8) & 255;
3397 fo
= layout
& (1<<16);
3398 geo
->raid_disks
= disks
;
3399 geo
->near_copies
= nc
;
3400 geo
->far_copies
= fc
;
3401 geo
->far_offset
= fo
;
3402 geo
->far_set_size
= (layout
& (1<<17)) ? disks
/ fc
: disks
;
3403 geo
->chunk_mask
= chunk
- 1;
3404 geo
->chunk_shift
= ffz(~chunk
);
3408 static struct r10conf
*setup_conf(struct mddev
*mddev
)
3410 struct r10conf
*conf
= NULL
;
3415 copies
= setup_geo(&geo
, mddev
, geo_new
);
3418 printk(KERN_ERR
"md/raid10:%s: chunk size must be "
3419 "at least PAGE_SIZE(%ld) and be a power of 2.\n",
3420 mdname(mddev
), PAGE_SIZE
);
3424 if (copies
< 2 || copies
> mddev
->raid_disks
) {
3425 printk(KERN_ERR
"md/raid10:%s: unsupported raid10 layout: 0x%8x\n",
3426 mdname(mddev
), mddev
->new_layout
);
3431 conf
= kzalloc(sizeof(struct r10conf
), GFP_KERNEL
);
3435 /* FIXME calc properly */
3436 conf
->mirrors
= kzalloc(sizeof(struct raid10_info
)*(mddev
->raid_disks
+
3437 max(0,-mddev
->delta_disks
)),
3442 conf
->tmppage
= alloc_page(GFP_KERNEL
);
3447 conf
->copies
= copies
;
3448 conf
->r10bio_pool
= mempool_create(NR_RAID10_BIOS
, r10bio_pool_alloc
,
3449 r10bio_pool_free
, conf
);
3450 if (!conf
->r10bio_pool
)
3453 calc_sectors(conf
, mddev
->dev_sectors
);
3454 if (mddev
->reshape_position
== MaxSector
) {
3455 conf
->prev
= conf
->geo
;
3456 conf
->reshape_progress
= MaxSector
;
3458 if (setup_geo(&conf
->prev
, mddev
, geo_old
) != conf
->copies
) {
3462 conf
->reshape_progress
= mddev
->reshape_position
;
3463 if (conf
->prev
.far_offset
)
3464 conf
->prev
.stride
= 1 << conf
->prev
.chunk_shift
;
3466 /* far_copies must be 1 */
3467 conf
->prev
.stride
= conf
->dev_sectors
;
3469 conf
->reshape_safe
= conf
->reshape_progress
;
3470 spin_lock_init(&conf
->device_lock
);
3471 INIT_LIST_HEAD(&conf
->retry_list
);
3472 INIT_LIST_HEAD(&conf
->bio_end_io_list
);
3474 spin_lock_init(&conf
->resync_lock
);
3475 init_waitqueue_head(&conf
->wait_barrier
);
3477 conf
->thread
= md_register_thread(raid10d
, mddev
, "raid10");
3481 conf
->mddev
= mddev
;
3486 printk(KERN_ERR
"md/raid10:%s: couldn't allocate memory.\n",
3489 if (conf
->r10bio_pool
)
3490 mempool_destroy(conf
->r10bio_pool
);
3491 kfree(conf
->mirrors
);
3492 safe_put_page(conf
->tmppage
);
3495 return ERR_PTR(err
);
3498 static int run(struct mddev
*mddev
)
3500 struct r10conf
*conf
;
3501 int i
, disk_idx
, chunk_size
;
3502 struct raid10_info
*disk
;
3503 struct md_rdev
*rdev
;
3505 sector_t min_offset_diff
= 0;
3507 bool discard_supported
= false;
3509 if (mddev
->private == NULL
) {
3510 conf
= setup_conf(mddev
);
3512 return PTR_ERR(conf
);
3513 mddev
->private = conf
;
3515 conf
= mddev
->private;
3519 mddev
->thread
= conf
->thread
;
3520 conf
->thread
= NULL
;
3522 chunk_size
= mddev
->chunk_sectors
<< 9;
3524 blk_queue_max_discard_sectors(mddev
->queue
,
3525 mddev
->chunk_sectors
);
3526 blk_queue_max_write_same_sectors(mddev
->queue
, 0);
3527 blk_queue_io_min(mddev
->queue
, chunk_size
);
3528 if (conf
->geo
.raid_disks
% conf
->geo
.near_copies
)
3529 blk_queue_io_opt(mddev
->queue
, chunk_size
* conf
->geo
.raid_disks
);
3531 blk_queue_io_opt(mddev
->queue
, chunk_size
*
3532 (conf
->geo
.raid_disks
/ conf
->geo
.near_copies
));
3535 rdev_for_each(rdev
, mddev
) {
3537 struct request_queue
*q
;
3539 disk_idx
= rdev
->raid_disk
;
3542 if (disk_idx
>= conf
->geo
.raid_disks
&&
3543 disk_idx
>= conf
->prev
.raid_disks
)
3545 disk
= conf
->mirrors
+ disk_idx
;
3547 if (test_bit(Replacement
, &rdev
->flags
)) {
3548 if (disk
->replacement
)
3550 disk
->replacement
= rdev
;
3556 q
= bdev_get_queue(rdev
->bdev
);
3557 diff
= (rdev
->new_data_offset
- rdev
->data_offset
);
3558 if (!mddev
->reshape_backwards
)
3562 if (first
|| diff
< min_offset_diff
)
3563 min_offset_diff
= diff
;
3566 disk_stack_limits(mddev
->gendisk
, rdev
->bdev
,
3567 rdev
->data_offset
<< 9);
3569 disk
->head_position
= 0;
3571 if (blk_queue_discard(bdev_get_queue(rdev
->bdev
)))
3572 discard_supported
= true;
3576 if (discard_supported
)
3577 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD
,
3580 queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD
,
3583 /* need to check that every block has at least one working mirror */
3584 if (!enough(conf
, -1)) {
3585 printk(KERN_ERR
"md/raid10:%s: not enough operational mirrors.\n",
3590 if (conf
->reshape_progress
!= MaxSector
) {
3591 /* must ensure that shape change is supported */
3592 if (conf
->geo
.far_copies
!= 1 &&
3593 conf
->geo
.far_offset
== 0)
3595 if (conf
->prev
.far_copies
!= 1 &&
3596 conf
->prev
.far_offset
== 0)
3600 mddev
->degraded
= 0;
3602 i
< conf
->geo
.raid_disks
3603 || i
< conf
->prev
.raid_disks
;
3606 disk
= conf
->mirrors
+ i
;
3608 if (!disk
->rdev
&& disk
->replacement
) {
3609 /* The replacement is all we have - use it */
3610 disk
->rdev
= disk
->replacement
;
3611 disk
->replacement
= NULL
;
3612 clear_bit(Replacement
, &disk
->rdev
->flags
);
3616 !test_bit(In_sync
, &disk
->rdev
->flags
)) {
3617 disk
->head_position
= 0;
3620 disk
->rdev
->saved_raid_disk
< 0)
3623 disk
->recovery_disabled
= mddev
->recovery_disabled
- 1;
3626 if (mddev
->recovery_cp
!= MaxSector
)
3627 printk(KERN_NOTICE
"md/raid10:%s: not clean"
3628 " -- starting background reconstruction\n",
3631 "md/raid10:%s: active with %d out of %d devices\n",
3632 mdname(mddev
), conf
->geo
.raid_disks
- mddev
->degraded
,
3633 conf
->geo
.raid_disks
);
3635 * Ok, everything is just fine now
3637 mddev
->dev_sectors
= conf
->dev_sectors
;
3638 size
= raid10_size(mddev
, 0, 0);
3639 md_set_array_sectors(mddev
, size
);
3640 mddev
->resync_max_sectors
= size
;
3643 int stripe
= conf
->geo
.raid_disks
*
3644 ((mddev
->chunk_sectors
<< 9) / PAGE_SIZE
);
3646 /* Calculate max read-ahead size.
3647 * We need to readahead at least twice a whole stripe....
3650 stripe
/= conf
->geo
.near_copies
;
3651 if (mddev
->queue
->backing_dev_info
.ra_pages
< 2 * stripe
)
3652 mddev
->queue
->backing_dev_info
.ra_pages
= 2 * stripe
;
3655 if (md_integrity_register(mddev
))
3658 if (conf
->reshape_progress
!= MaxSector
) {
3659 unsigned long before_length
, after_length
;
3661 before_length
= ((1 << conf
->prev
.chunk_shift
) *
3662 conf
->prev
.far_copies
);
3663 after_length
= ((1 << conf
->geo
.chunk_shift
) *
3664 conf
->geo
.far_copies
);
3666 if (max(before_length
, after_length
) > min_offset_diff
) {
3667 /* This cannot work */
3668 printk("md/raid10: offset difference not enough to continue reshape\n");
3671 conf
->offset_diff
= min_offset_diff
;
3673 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
3674 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
3675 set_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
3676 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
3677 mddev
->sync_thread
= md_register_thread(md_do_sync
, mddev
,
3684 md_unregister_thread(&mddev
->thread
);
3685 if (conf
->r10bio_pool
)
3686 mempool_destroy(conf
->r10bio_pool
);
3687 safe_put_page(conf
->tmppage
);
3688 kfree(conf
->mirrors
);
3690 mddev
->private = NULL
;
3695 static void raid10_free(struct mddev
*mddev
, void *priv
)
3697 struct r10conf
*conf
= priv
;
3699 if (conf
->r10bio_pool
)
3700 mempool_destroy(conf
->r10bio_pool
);
3701 safe_put_page(conf
->tmppage
);
3702 kfree(conf
->mirrors
);
3703 kfree(conf
->mirrors_old
);
3704 kfree(conf
->mirrors_new
);
3708 static void raid10_quiesce(struct mddev
*mddev
, int state
)
3710 struct r10conf
*conf
= mddev
->private;
3714 raise_barrier(conf
, 0);
3717 lower_barrier(conf
);
3722 static int raid10_resize(struct mddev
*mddev
, sector_t sectors
)
3724 /* Resize of 'far' arrays is not supported.
3725 * For 'near' and 'offset' arrays we can set the
3726 * number of sectors used to be an appropriate multiple
3727 * of the chunk size.
3728 * For 'offset', this is far_copies*chunksize.
3729 * For 'near' the multiplier is the LCM of
3730 * near_copies and raid_disks.
3731 * So if far_copies > 1 && !far_offset, fail.
3732 * Else find LCM(raid_disks, near_copy)*far_copies and
3733 * multiply by chunk_size. Then round to this number.
3734 * This is mostly done by raid10_size()
3736 struct r10conf
*conf
= mddev
->private;
3737 sector_t oldsize
, size
;
3739 if (mddev
->reshape_position
!= MaxSector
)
3742 if (conf
->geo
.far_copies
> 1 && !conf
->geo
.far_offset
)
3745 oldsize
= raid10_size(mddev
, 0, 0);
3746 size
= raid10_size(mddev
, sectors
, 0);
3747 if (mddev
->external_size
&&
3748 mddev
->array_sectors
> size
)
3750 if (mddev
->bitmap
) {
3751 int ret
= bitmap_resize(mddev
->bitmap
, size
, 0, 0);
3755 md_set_array_sectors(mddev
, size
);
3756 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
3757 revalidate_disk(mddev
->gendisk
);
3758 if (sectors
> mddev
->dev_sectors
&&
3759 mddev
->recovery_cp
> oldsize
) {
3760 mddev
->recovery_cp
= oldsize
;
3761 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3763 calc_sectors(conf
, sectors
);
3764 mddev
->dev_sectors
= conf
->dev_sectors
;
3765 mddev
->resync_max_sectors
= size
;
3769 static void *raid10_takeover_raid0(struct mddev
*mddev
, sector_t size
, int devs
)
3771 struct md_rdev
*rdev
;
3772 struct r10conf
*conf
;
3774 if (mddev
->degraded
> 0) {
3775 printk(KERN_ERR
"md/raid10:%s: Error: degraded raid0!\n",
3777 return ERR_PTR(-EINVAL
);
3779 sector_div(size
, devs
);
3781 /* Set new parameters */
3782 mddev
->new_level
= 10;
3783 /* new layout: far_copies = 1, near_copies = 2 */
3784 mddev
->new_layout
= (1<<8) + 2;
3785 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3786 mddev
->delta_disks
= mddev
->raid_disks
;
3787 mddev
->raid_disks
*= 2;
3788 /* make sure it will be not marked as dirty */
3789 mddev
->recovery_cp
= MaxSector
;
3790 mddev
->dev_sectors
= size
;
3792 conf
= setup_conf(mddev
);
3793 if (!IS_ERR(conf
)) {
3794 rdev_for_each(rdev
, mddev
)
3795 if (rdev
->raid_disk
>= 0) {
3796 rdev
->new_raid_disk
= rdev
->raid_disk
* 2;
3797 rdev
->sectors
= size
;
3805 static void *raid10_takeover(struct mddev
*mddev
)
3807 struct r0conf
*raid0_conf
;
3809 /* raid10 can take over:
3810 * raid0 - providing it has only two drives
3812 if (mddev
->level
== 0) {
3813 /* for raid0 takeover only one zone is supported */
3814 raid0_conf
= mddev
->private;
3815 if (raid0_conf
->nr_strip_zones
> 1) {
3816 printk(KERN_ERR
"md/raid10:%s: cannot takeover raid 0"
3817 " with more than one zone.\n",
3819 return ERR_PTR(-EINVAL
);
3821 return raid10_takeover_raid0(mddev
,
3822 raid0_conf
->strip_zone
->zone_end
,
3823 raid0_conf
->strip_zone
->nb_dev
);
3825 return ERR_PTR(-EINVAL
);
3828 static int raid10_check_reshape(struct mddev
*mddev
)
3830 /* Called when there is a request to change
3831 * - layout (to ->new_layout)
3832 * - chunk size (to ->new_chunk_sectors)
3833 * - raid_disks (by delta_disks)
3834 * or when trying to restart a reshape that was ongoing.
3836 * We need to validate the request and possibly allocate
3837 * space if that might be an issue later.
3839 * Currently we reject any reshape of a 'far' mode array,
3840 * allow chunk size to change if new is generally acceptable,
3841 * allow raid_disks to increase, and allow
3842 * a switch between 'near' mode and 'offset' mode.
3844 struct r10conf
*conf
= mddev
->private;
3847 if (conf
->geo
.far_copies
!= 1 && !conf
->geo
.far_offset
)
3850 if (setup_geo(&geo
, mddev
, geo_start
) != conf
->copies
)
3851 /* mustn't change number of copies */
3853 if (geo
.far_copies
> 1 && !geo
.far_offset
)
3854 /* Cannot switch to 'far' mode */
3857 if (mddev
->array_sectors
& geo
.chunk_mask
)
3858 /* not factor of array size */
3861 if (!enough(conf
, -1))
3864 kfree(conf
->mirrors_new
);
3865 conf
->mirrors_new
= NULL
;
3866 if (mddev
->delta_disks
> 0) {
3867 /* allocate new 'mirrors' list */
3868 conf
->mirrors_new
= kzalloc(
3869 sizeof(struct raid10_info
)
3870 *(mddev
->raid_disks
+
3871 mddev
->delta_disks
),
3873 if (!conf
->mirrors_new
)
3880 * Need to check if array has failed when deciding whether to:
3882 * - remove non-faulty devices
3885 * This determination is simple when no reshape is happening.
3886 * However if there is a reshape, we need to carefully check
3887 * both the before and after sections.
3888 * This is because some failed devices may only affect one
3889 * of the two sections, and some non-in_sync devices may
3890 * be insync in the section most affected by failed devices.
3892 static int calc_degraded(struct r10conf
*conf
)
3894 int degraded
, degraded2
;
3899 /* 'prev' section first */
3900 for (i
= 0; i
< conf
->prev
.raid_disks
; i
++) {
3901 struct md_rdev
*rdev
= rcu_dereference(conf
->mirrors
[i
].rdev
);
3902 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
3904 else if (!test_bit(In_sync
, &rdev
->flags
))
3905 /* When we can reduce the number of devices in
3906 * an array, this might not contribute to
3907 * 'degraded'. It does now.
3912 if (conf
->geo
.raid_disks
== conf
->prev
.raid_disks
)
3916 for (i
= 0; i
< conf
->geo
.raid_disks
; i
++) {
3917 struct md_rdev
*rdev
= rcu_dereference(conf
->mirrors
[i
].rdev
);
3918 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
3920 else if (!test_bit(In_sync
, &rdev
->flags
)) {
3921 /* If reshape is increasing the number of devices,
3922 * this section has already been recovered, so
3923 * it doesn't contribute to degraded.
3926 if (conf
->geo
.raid_disks
<= conf
->prev
.raid_disks
)
3931 if (degraded2
> degraded
)
3936 static int raid10_start_reshape(struct mddev
*mddev
)
3938 /* A 'reshape' has been requested. This commits
3939 * the various 'new' fields and sets MD_RECOVER_RESHAPE
3940 * This also checks if there are enough spares and adds them
3942 * We currently require enough spares to make the final
3943 * array non-degraded. We also require that the difference
3944 * between old and new data_offset - on each device - is
3945 * enough that we never risk over-writing.
3948 unsigned long before_length
, after_length
;
3949 sector_t min_offset_diff
= 0;
3952 struct r10conf
*conf
= mddev
->private;
3953 struct md_rdev
*rdev
;
3957 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
3960 if (setup_geo(&new, mddev
, geo_start
) != conf
->copies
)
3963 before_length
= ((1 << conf
->prev
.chunk_shift
) *
3964 conf
->prev
.far_copies
);
3965 after_length
= ((1 << conf
->geo
.chunk_shift
) *
3966 conf
->geo
.far_copies
);
3968 rdev_for_each(rdev
, mddev
) {
3969 if (!test_bit(In_sync
, &rdev
->flags
)
3970 && !test_bit(Faulty
, &rdev
->flags
))
3972 if (rdev
->raid_disk
>= 0) {
3973 long long diff
= (rdev
->new_data_offset
3974 - rdev
->data_offset
);
3975 if (!mddev
->reshape_backwards
)
3979 if (first
|| diff
< min_offset_diff
)
3980 min_offset_diff
= diff
;
3984 if (max(before_length
, after_length
) > min_offset_diff
)
3987 if (spares
< mddev
->delta_disks
)
3990 conf
->offset_diff
= min_offset_diff
;
3991 spin_lock_irq(&conf
->device_lock
);
3992 if (conf
->mirrors_new
) {
3993 memcpy(conf
->mirrors_new
, conf
->mirrors
,
3994 sizeof(struct raid10_info
)*conf
->prev
.raid_disks
);
3996 kfree(conf
->mirrors_old
);
3997 conf
->mirrors_old
= conf
->mirrors
;
3998 conf
->mirrors
= conf
->mirrors_new
;
3999 conf
->mirrors_new
= NULL
;
4001 setup_geo(&conf
->geo
, mddev
, geo_start
);
4003 if (mddev
->reshape_backwards
) {
4004 sector_t size
= raid10_size(mddev
, 0, 0);
4005 if (size
< mddev
->array_sectors
) {
4006 spin_unlock_irq(&conf
->device_lock
);
4007 printk(KERN_ERR
"md/raid10:%s: array size must be reduce before number of disks\n",
4011 mddev
->resync_max_sectors
= size
;
4012 conf
->reshape_progress
= size
;
4014 conf
->reshape_progress
= 0;
4015 conf
->reshape_safe
= conf
->reshape_progress
;
4016 spin_unlock_irq(&conf
->device_lock
);
4018 if (mddev
->delta_disks
&& mddev
->bitmap
) {
4019 ret
= bitmap_resize(mddev
->bitmap
,
4020 raid10_size(mddev
, 0,
4021 conf
->geo
.raid_disks
),
4026 if (mddev
->delta_disks
> 0) {
4027 rdev_for_each(rdev
, mddev
)
4028 if (rdev
->raid_disk
< 0 &&
4029 !test_bit(Faulty
, &rdev
->flags
)) {
4030 if (raid10_add_disk(mddev
, rdev
) == 0) {
4031 if (rdev
->raid_disk
>=
4032 conf
->prev
.raid_disks
)
4033 set_bit(In_sync
, &rdev
->flags
);
4035 rdev
->recovery_offset
= 0;
4037 if (sysfs_link_rdev(mddev
, rdev
))
4038 /* Failure here is OK */;
4040 } else if (rdev
->raid_disk
>= conf
->prev
.raid_disks
4041 && !test_bit(Faulty
, &rdev
->flags
)) {
4042 /* This is a spare that was manually added */
4043 set_bit(In_sync
, &rdev
->flags
);
4046 /* When a reshape changes the number of devices,
4047 * ->degraded is measured against the larger of the
4048 * pre and post numbers.
4050 spin_lock_irq(&conf
->device_lock
);
4051 mddev
->degraded
= calc_degraded(conf
);
4052 spin_unlock_irq(&conf
->device_lock
);
4053 mddev
->raid_disks
= conf
->geo
.raid_disks
;
4054 mddev
->reshape_position
= conf
->reshape_progress
;
4055 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
4057 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
4058 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
4059 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
4060 set_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
4061 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
4063 mddev
->sync_thread
= md_register_thread(md_do_sync
, mddev
,
4065 if (!mddev
->sync_thread
) {
4069 conf
->reshape_checkpoint
= jiffies
;
4070 md_wakeup_thread(mddev
->sync_thread
);
4071 md_new_event(mddev
);
4075 mddev
->recovery
= 0;
4076 spin_lock_irq(&conf
->device_lock
);
4077 conf
->geo
= conf
->prev
;
4078 mddev
->raid_disks
= conf
->geo
.raid_disks
;
4079 rdev_for_each(rdev
, mddev
)
4080 rdev
->new_data_offset
= rdev
->data_offset
;
4082 conf
->reshape_progress
= MaxSector
;
4083 conf
->reshape_safe
= MaxSector
;
4084 mddev
->reshape_position
= MaxSector
;
4085 spin_unlock_irq(&conf
->device_lock
);
4089 /* Calculate the last device-address that could contain
4090 * any block from the chunk that includes the array-address 's'
4091 * and report the next address.
4092 * i.e. the address returned will be chunk-aligned and after
4093 * any data that is in the chunk containing 's'.
4095 static sector_t
last_dev_address(sector_t s
, struct geom
*geo
)
4097 s
= (s
| geo
->chunk_mask
) + 1;
4098 s
>>= geo
->chunk_shift
;
4099 s
*= geo
->near_copies
;
4100 s
= DIV_ROUND_UP_SECTOR_T(s
, geo
->raid_disks
);
4101 s
*= geo
->far_copies
;
4102 s
<<= geo
->chunk_shift
;
4106 /* Calculate the first device-address that could contain
4107 * any block from the chunk that includes the array-address 's'.
4108 * This too will be the start of a chunk
4110 static sector_t
first_dev_address(sector_t s
, struct geom
*geo
)
4112 s
>>= geo
->chunk_shift
;
4113 s
*= geo
->near_copies
;
4114 sector_div(s
, geo
->raid_disks
);
4115 s
*= geo
->far_copies
;
4116 s
<<= geo
->chunk_shift
;
4120 static sector_t
reshape_request(struct mddev
*mddev
, sector_t sector_nr
,
4123 /* We simply copy at most one chunk (smallest of old and new)
4124 * at a time, possibly less if that exceeds RESYNC_PAGES,
4125 * or we hit a bad block or something.
4126 * This might mean we pause for normal IO in the middle of
4127 * a chunk, but that is not a problem as mddev->reshape_position
4128 * can record any location.
4130 * If we will want to write to a location that isn't
4131 * yet recorded as 'safe' (i.e. in metadata on disk) then
4132 * we need to flush all reshape requests and update the metadata.
4134 * When reshaping forwards (e.g. to more devices), we interpret
4135 * 'safe' as the earliest block which might not have been copied
4136 * down yet. We divide this by previous stripe size and multiply
4137 * by previous stripe length to get lowest device offset that we
4138 * cannot write to yet.
4139 * We interpret 'sector_nr' as an address that we want to write to.
4140 * From this we use last_device_address() to find where we might
4141 * write to, and first_device_address on the 'safe' position.
4142 * If this 'next' write position is after the 'safe' position,
4143 * we must update the metadata to increase the 'safe' position.
4145 * When reshaping backwards, we round in the opposite direction
4146 * and perform the reverse test: next write position must not be
4147 * less than current safe position.
4149 * In all this the minimum difference in data offsets
4150 * (conf->offset_diff - always positive) allows a bit of slack,
4151 * so next can be after 'safe', but not by more than offset_diff
4153 * We need to prepare all the bios here before we start any IO
4154 * to ensure the size we choose is acceptable to all devices.
4155 * The means one for each copy for write-out and an extra one for
4157 * We store the read-in bio in ->master_bio and the others in
4158 * ->devs[x].bio and ->devs[x].repl_bio.
4160 struct r10conf
*conf
= mddev
->private;
4161 struct r10bio
*r10_bio
;
4162 sector_t next
, safe
, last
;
4166 struct md_rdev
*rdev
;
4169 struct bio
*bio
, *read_bio
;
4170 int sectors_done
= 0;
4172 if (sector_nr
== 0) {
4173 /* If restarting in the middle, skip the initial sectors */
4174 if (mddev
->reshape_backwards
&&
4175 conf
->reshape_progress
< raid10_size(mddev
, 0, 0)) {
4176 sector_nr
= (raid10_size(mddev
, 0, 0)
4177 - conf
->reshape_progress
);
4178 } else if (!mddev
->reshape_backwards
&&
4179 conf
->reshape_progress
> 0)
4180 sector_nr
= conf
->reshape_progress
;
4182 mddev
->curr_resync_completed
= sector_nr
;
4183 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
4189 /* We don't use sector_nr to track where we are up to
4190 * as that doesn't work well for ->reshape_backwards.
4191 * So just use ->reshape_progress.
4193 if (mddev
->reshape_backwards
) {
4194 /* 'next' is the earliest device address that we might
4195 * write to for this chunk in the new layout
4197 next
= first_dev_address(conf
->reshape_progress
- 1,
4200 /* 'safe' is the last device address that we might read from
4201 * in the old layout after a restart
4203 safe
= last_dev_address(conf
->reshape_safe
- 1,
4206 if (next
+ conf
->offset_diff
< safe
)
4209 last
= conf
->reshape_progress
- 1;
4210 sector_nr
= last
& ~(sector_t
)(conf
->geo
.chunk_mask
4211 & conf
->prev
.chunk_mask
);
4212 if (sector_nr
+ RESYNC_BLOCK_SIZE
/512 < last
)
4213 sector_nr
= last
+ 1 - RESYNC_BLOCK_SIZE
/512;
4215 /* 'next' is after the last device address that we
4216 * might write to for this chunk in the new layout
4218 next
= last_dev_address(conf
->reshape_progress
, &conf
->geo
);
4220 /* 'safe' is the earliest device address that we might
4221 * read from in the old layout after a restart
4223 safe
= first_dev_address(conf
->reshape_safe
, &conf
->prev
);
4225 /* Need to update metadata if 'next' might be beyond 'safe'
4226 * as that would possibly corrupt data
4228 if (next
> safe
+ conf
->offset_diff
)
4231 sector_nr
= conf
->reshape_progress
;
4232 last
= sector_nr
| (conf
->geo
.chunk_mask
4233 & conf
->prev
.chunk_mask
);
4235 if (sector_nr
+ RESYNC_BLOCK_SIZE
/512 <= last
)
4236 last
= sector_nr
+ RESYNC_BLOCK_SIZE
/512 - 1;
4240 time_after(jiffies
, conf
->reshape_checkpoint
+ 10*HZ
)) {
4241 /* Need to update reshape_position in metadata */
4243 mddev
->reshape_position
= conf
->reshape_progress
;
4244 if (mddev
->reshape_backwards
)
4245 mddev
->curr_resync_completed
= raid10_size(mddev
, 0, 0)
4246 - conf
->reshape_progress
;
4248 mddev
->curr_resync_completed
= conf
->reshape_progress
;
4249 conf
->reshape_checkpoint
= jiffies
;
4250 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
4251 md_wakeup_thread(mddev
->thread
);
4252 wait_event(mddev
->sb_wait
, mddev
->flags
== 0 ||
4253 test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
));
4254 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
4255 allow_barrier(conf
);
4256 return sectors_done
;
4258 conf
->reshape_safe
= mddev
->reshape_position
;
4259 allow_barrier(conf
);
4263 /* Now schedule reads for blocks from sector_nr to last */
4264 r10_bio
= mempool_alloc(conf
->r10buf_pool
, GFP_NOIO
);
4266 raise_barrier(conf
, sectors_done
!= 0);
4267 atomic_set(&r10_bio
->remaining
, 0);
4268 r10_bio
->mddev
= mddev
;
4269 r10_bio
->sector
= sector_nr
;
4270 set_bit(R10BIO_IsReshape
, &r10_bio
->state
);
4271 r10_bio
->sectors
= last
- sector_nr
+ 1;
4272 rdev
= read_balance(conf
, r10_bio
, &max_sectors
);
4273 BUG_ON(!test_bit(R10BIO_Previous
, &r10_bio
->state
));
4276 /* Cannot read from here, so need to record bad blocks
4277 * on all the target devices.
4280 mempool_free(r10_bio
, conf
->r10buf_pool
);
4281 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4282 return sectors_done
;
4285 read_bio
= bio_alloc_mddev(GFP_KERNEL
, RESYNC_PAGES
, mddev
);
4287 read_bio
->bi_bdev
= rdev
->bdev
;
4288 read_bio
->bi_iter
.bi_sector
= (r10_bio
->devs
[r10_bio
->read_slot
].addr
4289 + rdev
->data_offset
);
4290 read_bio
->bi_private
= r10_bio
;
4291 read_bio
->bi_end_io
= end_sync_read
;
4292 read_bio
->bi_rw
= READ
;
4293 read_bio
->bi_flags
&= (~0UL << BIO_RESET_BITS
);
4294 read_bio
->bi_error
= 0;
4295 read_bio
->bi_vcnt
= 0;
4296 read_bio
->bi_iter
.bi_size
= 0;
4297 r10_bio
->master_bio
= read_bio
;
4298 r10_bio
->read_slot
= r10_bio
->devs
[r10_bio
->read_slot
].devnum
;
4300 /* Now find the locations in the new layout */
4301 __raid10_find_phys(&conf
->geo
, r10_bio
);
4304 read_bio
->bi_next
= NULL
;
4306 for (s
= 0; s
< conf
->copies
*2; s
++) {
4308 int d
= r10_bio
->devs
[s
/2].devnum
;
4309 struct md_rdev
*rdev2
;
4311 rdev2
= conf
->mirrors
[d
].replacement
;
4312 b
= r10_bio
->devs
[s
/2].repl_bio
;
4314 rdev2
= conf
->mirrors
[d
].rdev
;
4315 b
= r10_bio
->devs
[s
/2].bio
;
4317 if (!rdev2
|| test_bit(Faulty
, &rdev2
->flags
))
4321 b
->bi_bdev
= rdev2
->bdev
;
4322 b
->bi_iter
.bi_sector
= r10_bio
->devs
[s
/2].addr
+
4323 rdev2
->new_data_offset
;
4324 b
->bi_private
= r10_bio
;
4325 b
->bi_end_io
= end_reshape_write
;
4331 /* Now add as many pages as possible to all of these bios. */
4334 for (s
= 0 ; s
< max_sectors
; s
+= PAGE_SIZE
>> 9) {
4335 struct page
*page
= r10_bio
->devs
[0].bio
->bi_io_vec
[s
/(PAGE_SIZE
>>9)].bv_page
;
4336 int len
= (max_sectors
- s
) << 9;
4337 if (len
> PAGE_SIZE
)
4339 for (bio
= blist
; bio
; bio
= bio
->bi_next
) {
4341 if (bio_add_page(bio
, page
, len
, 0))
4344 /* Didn't fit, must stop */
4346 bio2
&& bio2
!= bio
;
4347 bio2
= bio2
->bi_next
) {
4348 /* Remove last page from this bio */
4350 bio2
->bi_iter
.bi_size
-= len
;
4351 bio_clear_flag(bio2
, BIO_SEG_VALID
);
4355 sector_nr
+= len
>> 9;
4356 nr_sectors
+= len
>> 9;
4359 r10_bio
->sectors
= nr_sectors
;
4361 /* Now submit the read */
4362 md_sync_acct(read_bio
->bi_bdev
, r10_bio
->sectors
);
4363 atomic_inc(&r10_bio
->remaining
);
4364 read_bio
->bi_next
= NULL
;
4365 generic_make_request(read_bio
);
4366 sector_nr
+= nr_sectors
;
4367 sectors_done
+= nr_sectors
;
4368 if (sector_nr
<= last
)
4371 /* Now that we have done the whole section we can
4372 * update reshape_progress
4374 if (mddev
->reshape_backwards
)
4375 conf
->reshape_progress
-= sectors_done
;
4377 conf
->reshape_progress
+= sectors_done
;
4379 return sectors_done
;
4382 static void end_reshape_request(struct r10bio
*r10_bio
);
4383 static int handle_reshape_read_error(struct mddev
*mddev
,
4384 struct r10bio
*r10_bio
);
4385 static void reshape_request_write(struct mddev
*mddev
, struct r10bio
*r10_bio
)
4387 /* Reshape read completed. Hopefully we have a block
4389 * If we got a read error then we do sync 1-page reads from
4390 * elsewhere until we find the data - or give up.
4392 struct r10conf
*conf
= mddev
->private;
4395 if (!test_bit(R10BIO_Uptodate
, &r10_bio
->state
))
4396 if (handle_reshape_read_error(mddev
, r10_bio
) < 0) {
4397 /* Reshape has been aborted */
4398 md_done_sync(mddev
, r10_bio
->sectors
, 0);
4402 /* We definitely have the data in the pages, schedule the
4405 atomic_set(&r10_bio
->remaining
, 1);
4406 for (s
= 0; s
< conf
->copies
*2; s
++) {
4408 int d
= r10_bio
->devs
[s
/2].devnum
;
4409 struct md_rdev
*rdev
;
4411 rdev
= conf
->mirrors
[d
].replacement
;
4412 b
= r10_bio
->devs
[s
/2].repl_bio
;
4414 rdev
= conf
->mirrors
[d
].rdev
;
4415 b
= r10_bio
->devs
[s
/2].bio
;
4417 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
4419 atomic_inc(&rdev
->nr_pending
);
4420 md_sync_acct(b
->bi_bdev
, r10_bio
->sectors
);
4421 atomic_inc(&r10_bio
->remaining
);
4423 generic_make_request(b
);
4425 end_reshape_request(r10_bio
);
4428 static void end_reshape(struct r10conf
*conf
)
4430 if (test_bit(MD_RECOVERY_INTR
, &conf
->mddev
->recovery
))
4433 spin_lock_irq(&conf
->device_lock
);
4434 conf
->prev
= conf
->geo
;
4435 md_finish_reshape(conf
->mddev
);
4437 conf
->reshape_progress
= MaxSector
;
4438 conf
->reshape_safe
= MaxSector
;
4439 spin_unlock_irq(&conf
->device_lock
);
4441 /* read-ahead size must cover two whole stripes, which is
4442 * 2 * (datadisks) * chunksize where 'n' is the number of raid devices
4444 if (conf
->mddev
->queue
) {
4445 int stripe
= conf
->geo
.raid_disks
*
4446 ((conf
->mddev
->chunk_sectors
<< 9) / PAGE_SIZE
);
4447 stripe
/= conf
->geo
.near_copies
;
4448 if (conf
->mddev
->queue
->backing_dev_info
.ra_pages
< 2 * stripe
)
4449 conf
->mddev
->queue
->backing_dev_info
.ra_pages
= 2 * stripe
;
4454 static int handle_reshape_read_error(struct mddev
*mddev
,
4455 struct r10bio
*r10_bio
)
4457 /* Use sync reads to get the blocks from somewhere else */
4458 int sectors
= r10_bio
->sectors
;
4459 struct r10conf
*conf
= mddev
->private;
4461 struct r10bio r10_bio
;
4462 struct r10dev devs
[conf
->copies
];
4464 struct r10bio
*r10b
= &on_stack
.r10_bio
;
4467 struct bio_vec
*bvec
= r10_bio
->master_bio
->bi_io_vec
;
4469 r10b
->sector
= r10_bio
->sector
;
4470 __raid10_find_phys(&conf
->prev
, r10b
);
4475 int first_slot
= slot
;
4477 if (s
> (PAGE_SIZE
>> 9))
4481 int d
= r10b
->devs
[slot
].devnum
;
4482 struct md_rdev
*rdev
= conf
->mirrors
[d
].rdev
;
4485 test_bit(Faulty
, &rdev
->flags
) ||
4486 !test_bit(In_sync
, &rdev
->flags
))
4489 addr
= r10b
->devs
[slot
].addr
+ idx
* PAGE_SIZE
;
4490 success
= sync_page_io(rdev
,
4499 if (slot
>= conf
->copies
)
4501 if (slot
== first_slot
)
4505 /* couldn't read this block, must give up */
4506 set_bit(MD_RECOVERY_INTR
,
4516 static void end_reshape_write(struct bio
*bio
)
4518 struct r10bio
*r10_bio
= bio
->bi_private
;
4519 struct mddev
*mddev
= r10_bio
->mddev
;
4520 struct r10conf
*conf
= mddev
->private;
4524 struct md_rdev
*rdev
= NULL
;
4526 d
= find_bio_disk(conf
, r10_bio
, bio
, &slot
, &repl
);
4528 rdev
= conf
->mirrors
[d
].replacement
;
4531 rdev
= conf
->mirrors
[d
].rdev
;
4534 if (bio
->bi_error
) {
4535 /* FIXME should record badblock */
4536 md_error(mddev
, rdev
);
4539 rdev_dec_pending(rdev
, mddev
);
4540 end_reshape_request(r10_bio
);
4543 static void end_reshape_request(struct r10bio
*r10_bio
)
4545 if (!atomic_dec_and_test(&r10_bio
->remaining
))
4547 md_done_sync(r10_bio
->mddev
, r10_bio
->sectors
, 1);
4548 bio_put(r10_bio
->master_bio
);
4552 static void raid10_finish_reshape(struct mddev
*mddev
)
4554 struct r10conf
*conf
= mddev
->private;
4556 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
4559 if (mddev
->delta_disks
> 0) {
4560 sector_t size
= raid10_size(mddev
, 0, 0);
4561 md_set_array_sectors(mddev
, size
);
4562 if (mddev
->recovery_cp
> mddev
->resync_max_sectors
) {
4563 mddev
->recovery_cp
= mddev
->resync_max_sectors
;
4564 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4566 mddev
->resync_max_sectors
= size
;
4567 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
4568 revalidate_disk(mddev
->gendisk
);
4571 for (d
= conf
->geo
.raid_disks
;
4572 d
< conf
->geo
.raid_disks
- mddev
->delta_disks
;
4574 struct md_rdev
*rdev
= conf
->mirrors
[d
].rdev
;
4576 clear_bit(In_sync
, &rdev
->flags
);
4577 rdev
= conf
->mirrors
[d
].replacement
;
4579 clear_bit(In_sync
, &rdev
->flags
);
4582 mddev
->layout
= mddev
->new_layout
;
4583 mddev
->chunk_sectors
= 1 << conf
->geo
.chunk_shift
;
4584 mddev
->reshape_position
= MaxSector
;
4585 mddev
->delta_disks
= 0;
4586 mddev
->reshape_backwards
= 0;
4589 static struct md_personality raid10_personality
=
4593 .owner
= THIS_MODULE
,
4594 .make_request
= make_request
,
4596 .free
= raid10_free
,
4598 .error_handler
= error
,
4599 .hot_add_disk
= raid10_add_disk
,
4600 .hot_remove_disk
= raid10_remove_disk
,
4601 .spare_active
= raid10_spare_active
,
4602 .sync_request
= sync_request
,
4603 .quiesce
= raid10_quiesce
,
4604 .size
= raid10_size
,
4605 .resize
= raid10_resize
,
4606 .takeover
= raid10_takeover
,
4607 .check_reshape
= raid10_check_reshape
,
4608 .start_reshape
= raid10_start_reshape
,
4609 .finish_reshape
= raid10_finish_reshape
,
4610 .congested
= raid10_congested
,
4613 static int __init
raid_init(void)
4615 return register_md_personality(&raid10_personality
);
4618 static void raid_exit(void)
4620 unregister_md_personality(&raid10_personality
);
4623 module_init(raid_init
);
4624 module_exit(raid_exit
);
4625 MODULE_LICENSE("GPL");
4626 MODULE_DESCRIPTION("RAID10 (striped mirror) personality for MD");
4627 MODULE_ALIAS("md-personality-9"); /* RAID10 */
4628 MODULE_ALIAS("md-raid10");
4629 MODULE_ALIAS("md-level-10");
4631 module_param(max_queued_requests
, int, S_IRUGO
|S_IWUSR
);