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 )
42 * The data to be stored is divided into chunks using chunksize.
43 * Each device is divided into far_copies sections.
44 * In each section, chunks are laid out in a style similar to raid0, but
45 * near_copies copies of each chunk is stored (each on a different drive).
46 * The starting device for each section is offset near_copies from the starting
47 * device of the previous section.
48 * Thus they are (near_copies*far_copies) of each chunk, and each is on a different
50 * near_copies and far_copies must be at least one, and their product is at most
53 * If far_offset is true, then the far_copies are handled a bit differently.
54 * The copies are still in different stripes, but instead of be very far apart
55 * on disk, there are adjacent stripes.
59 * Number of guaranteed r10bios in case of extreme VM load:
61 #define NR_RAID10_BIOS 256
63 /* when we get a read error on a read-only array, we redirect to another
64 * device without failing the first device, or trying to over-write to
65 * correct the read error. To keep track of bad blocks on a per-bio
66 * level, we store IO_BLOCKED in the appropriate 'bios' pointer
68 #define IO_BLOCKED ((struct bio *)1)
69 /* When we successfully write to a known bad-block, we need to remove the
70 * bad-block marking which must be done from process context. So we record
71 * the success by setting devs[n].bio to IO_MADE_GOOD
73 #define IO_MADE_GOOD ((struct bio *)2)
75 #define BIO_SPECIAL(bio) ((unsigned long)bio <= 2)
77 /* When there are this many requests queued to be written by
78 * the raid10 thread, we become 'congested' to provide back-pressure
81 static int max_queued_requests
= 1024;
83 static void allow_barrier(struct r10conf
*conf
);
84 static void lower_barrier(struct r10conf
*conf
);
85 static int enough(struct r10conf
*conf
, int ignore
);
86 static sector_t
reshape_request(struct mddev
*mddev
, sector_t sector_nr
,
88 static void reshape_request_write(struct mddev
*mddev
, struct r10bio
*r10_bio
);
89 static void end_reshape_write(struct bio
*bio
, int error
);
90 static void end_reshape(struct r10conf
*conf
);
92 static void * r10bio_pool_alloc(gfp_t gfp_flags
, void *data
)
94 struct r10conf
*conf
= data
;
95 int size
= offsetof(struct r10bio
, devs
[conf
->copies
]);
97 /* allocate a r10bio with room for raid_disks entries in the
99 return kzalloc(size
, gfp_flags
);
102 static void r10bio_pool_free(void *r10_bio
, void *data
)
107 /* Maximum size of each resync request */
108 #define RESYNC_BLOCK_SIZE (64*1024)
109 #define RESYNC_PAGES ((RESYNC_BLOCK_SIZE + PAGE_SIZE-1) / PAGE_SIZE)
110 /* amount of memory to reserve for resync requests */
111 #define RESYNC_WINDOW (1024*1024)
112 /* maximum number of concurrent requests, memory permitting */
113 #define RESYNC_DEPTH (32*1024*1024/RESYNC_BLOCK_SIZE)
116 * When performing a resync, we need to read and compare, so
117 * we need as many pages are there are copies.
118 * When performing a recovery, we need 2 bios, one for read,
119 * one for write (we recover only one drive per r10buf)
122 static void * r10buf_pool_alloc(gfp_t gfp_flags
, void *data
)
124 struct r10conf
*conf
= data
;
126 struct r10bio
*r10_bio
;
131 r10_bio
= r10bio_pool_alloc(gfp_flags
, conf
);
135 if (test_bit(MD_RECOVERY_SYNC
, &conf
->mddev
->recovery
) ||
136 test_bit(MD_RECOVERY_RESHAPE
, &conf
->mddev
->recovery
))
137 nalloc
= conf
->copies
; /* resync */
139 nalloc
= 2; /* recovery */
144 for (j
= nalloc
; j
-- ; ) {
145 bio
= bio_kmalloc(gfp_flags
, RESYNC_PAGES
);
148 r10_bio
->devs
[j
].bio
= bio
;
149 if (!conf
->have_replacement
)
151 bio
= bio_kmalloc(gfp_flags
, RESYNC_PAGES
);
154 r10_bio
->devs
[j
].repl_bio
= bio
;
157 * Allocate RESYNC_PAGES data pages and attach them
160 for (j
= 0 ; j
< nalloc
; j
++) {
161 struct bio
*rbio
= r10_bio
->devs
[j
].repl_bio
;
162 bio
= r10_bio
->devs
[j
].bio
;
163 for (i
= 0; i
< RESYNC_PAGES
; i
++) {
164 if (j
> 0 && !test_bit(MD_RECOVERY_SYNC
,
165 &conf
->mddev
->recovery
)) {
166 /* we can share bv_page's during recovery
168 struct bio
*rbio
= r10_bio
->devs
[0].bio
;
169 page
= rbio
->bi_io_vec
[i
].bv_page
;
172 page
= alloc_page(gfp_flags
);
176 bio
->bi_io_vec
[i
].bv_page
= page
;
178 rbio
->bi_io_vec
[i
].bv_page
= page
;
186 safe_put_page(bio
->bi_io_vec
[i
-1].bv_page
);
188 for (i
= 0; i
< RESYNC_PAGES
; i
++)
189 safe_put_page(r10_bio
->devs
[j
].bio
->bi_io_vec
[i
].bv_page
);
192 for ( ; j
< nalloc
; j
++) {
193 if (r10_bio
->devs
[j
].bio
)
194 bio_put(r10_bio
->devs
[j
].bio
);
195 if (r10_bio
->devs
[j
].repl_bio
)
196 bio_put(r10_bio
->devs
[j
].repl_bio
);
198 r10bio_pool_free(r10_bio
, conf
);
202 static void r10buf_pool_free(void *__r10_bio
, void *data
)
205 struct r10conf
*conf
= data
;
206 struct r10bio
*r10bio
= __r10_bio
;
209 for (j
=0; j
< conf
->copies
; j
++) {
210 struct bio
*bio
= r10bio
->devs
[j
].bio
;
212 for (i
= 0; i
< RESYNC_PAGES
; i
++) {
213 safe_put_page(bio
->bi_io_vec
[i
].bv_page
);
214 bio
->bi_io_vec
[i
].bv_page
= NULL
;
218 bio
= r10bio
->devs
[j
].repl_bio
;
222 r10bio_pool_free(r10bio
, conf
);
225 static void put_all_bios(struct r10conf
*conf
, struct r10bio
*r10_bio
)
229 for (i
= 0; i
< conf
->copies
; i
++) {
230 struct bio
**bio
= & r10_bio
->devs
[i
].bio
;
231 if (!BIO_SPECIAL(*bio
))
234 bio
= &r10_bio
->devs
[i
].repl_bio
;
235 if (r10_bio
->read_slot
< 0 && !BIO_SPECIAL(*bio
))
241 static void free_r10bio(struct r10bio
*r10_bio
)
243 struct r10conf
*conf
= r10_bio
->mddev
->private;
245 put_all_bios(conf
, r10_bio
);
246 mempool_free(r10_bio
, conf
->r10bio_pool
);
249 static void put_buf(struct r10bio
*r10_bio
)
251 struct r10conf
*conf
= r10_bio
->mddev
->private;
253 mempool_free(r10_bio
, conf
->r10buf_pool
);
258 static void reschedule_retry(struct r10bio
*r10_bio
)
261 struct mddev
*mddev
= r10_bio
->mddev
;
262 struct r10conf
*conf
= mddev
->private;
264 spin_lock_irqsave(&conf
->device_lock
, flags
);
265 list_add(&r10_bio
->retry_list
, &conf
->retry_list
);
267 spin_unlock_irqrestore(&conf
->device_lock
, flags
);
269 /* wake up frozen array... */
270 wake_up(&conf
->wait_barrier
);
272 md_wakeup_thread(mddev
->thread
);
276 * raid_end_bio_io() is called when we have finished servicing a mirrored
277 * operation and are ready to return a success/failure code to the buffer
280 static void raid_end_bio_io(struct r10bio
*r10_bio
)
282 struct bio
*bio
= r10_bio
->master_bio
;
284 struct r10conf
*conf
= r10_bio
->mddev
->private;
286 if (bio
->bi_phys_segments
) {
288 spin_lock_irqsave(&conf
->device_lock
, flags
);
289 bio
->bi_phys_segments
--;
290 done
= (bio
->bi_phys_segments
== 0);
291 spin_unlock_irqrestore(&conf
->device_lock
, flags
);
294 if (!test_bit(R10BIO_Uptodate
, &r10_bio
->state
))
295 clear_bit(BIO_UPTODATE
, &bio
->bi_flags
);
299 * Wake up any possible resync thread that waits for the device
304 free_r10bio(r10_bio
);
308 * Update disk head position estimator based on IRQ completion info.
310 static inline void update_head_pos(int slot
, struct r10bio
*r10_bio
)
312 struct r10conf
*conf
= r10_bio
->mddev
->private;
314 conf
->mirrors
[r10_bio
->devs
[slot
].devnum
].head_position
=
315 r10_bio
->devs
[slot
].addr
+ (r10_bio
->sectors
);
319 * Find the disk number which triggered given bio
321 static int find_bio_disk(struct r10conf
*conf
, struct r10bio
*r10_bio
,
322 struct bio
*bio
, int *slotp
, int *replp
)
327 for (slot
= 0; slot
< conf
->copies
; slot
++) {
328 if (r10_bio
->devs
[slot
].bio
== bio
)
330 if (r10_bio
->devs
[slot
].repl_bio
== bio
) {
336 BUG_ON(slot
== conf
->copies
);
337 update_head_pos(slot
, r10_bio
);
343 return r10_bio
->devs
[slot
].devnum
;
346 static void raid10_end_read_request(struct bio
*bio
, int error
)
348 int uptodate
= test_bit(BIO_UPTODATE
, &bio
->bi_flags
);
349 struct r10bio
*r10_bio
= bio
->bi_private
;
351 struct md_rdev
*rdev
;
352 struct r10conf
*conf
= r10_bio
->mddev
->private;
355 slot
= r10_bio
->read_slot
;
356 dev
= r10_bio
->devs
[slot
].devnum
;
357 rdev
= r10_bio
->devs
[slot
].rdev
;
359 * this branch is our 'one mirror IO has finished' event handler:
361 update_head_pos(slot
, r10_bio
);
365 * Set R10BIO_Uptodate in our master bio, so that
366 * we will return a good error code to the higher
367 * levels even if IO on some other mirrored buffer fails.
369 * The 'master' represents the composite IO operation to
370 * user-side. So if something waits for IO, then it will
371 * wait for the 'master' bio.
373 set_bit(R10BIO_Uptodate
, &r10_bio
->state
);
375 /* If all other devices that store this block have
376 * failed, we want to return the error upwards rather
377 * than fail the last device. Here we redefine
378 * "uptodate" to mean "Don't want to retry"
381 spin_lock_irqsave(&conf
->device_lock
, flags
);
382 if (!enough(conf
, rdev
->raid_disk
))
384 spin_unlock_irqrestore(&conf
->device_lock
, flags
);
387 raid_end_bio_io(r10_bio
);
388 rdev_dec_pending(rdev
, conf
->mddev
);
391 * oops, read error - keep the refcount on the rdev
393 char b
[BDEVNAME_SIZE
];
394 printk_ratelimited(KERN_ERR
395 "md/raid10:%s: %s: rescheduling sector %llu\n",
397 bdevname(rdev
->bdev
, b
),
398 (unsigned long long)r10_bio
->sector
);
399 set_bit(R10BIO_ReadError
, &r10_bio
->state
);
400 reschedule_retry(r10_bio
);
404 static void close_write(struct r10bio
*r10_bio
)
406 /* clear the bitmap if all writes complete successfully */
407 bitmap_endwrite(r10_bio
->mddev
->bitmap
, r10_bio
->sector
,
409 !test_bit(R10BIO_Degraded
, &r10_bio
->state
),
411 md_write_end(r10_bio
->mddev
);
414 static void one_write_done(struct r10bio
*r10_bio
)
416 if (atomic_dec_and_test(&r10_bio
->remaining
)) {
417 if (test_bit(R10BIO_WriteError
, &r10_bio
->state
))
418 reschedule_retry(r10_bio
);
420 close_write(r10_bio
);
421 if (test_bit(R10BIO_MadeGood
, &r10_bio
->state
))
422 reschedule_retry(r10_bio
);
424 raid_end_bio_io(r10_bio
);
429 static void raid10_end_write_request(struct bio
*bio
, int error
)
431 int uptodate
= test_bit(BIO_UPTODATE
, &bio
->bi_flags
);
432 struct r10bio
*r10_bio
= bio
->bi_private
;
435 struct r10conf
*conf
= r10_bio
->mddev
->private;
437 struct md_rdev
*rdev
= NULL
;
439 dev
= find_bio_disk(conf
, r10_bio
, bio
, &slot
, &repl
);
442 rdev
= conf
->mirrors
[dev
].replacement
;
446 rdev
= conf
->mirrors
[dev
].rdev
;
449 * this branch is our 'one mirror IO has finished' event handler:
453 /* Never record new bad blocks to replacement,
456 md_error(rdev
->mddev
, rdev
);
458 set_bit(WriteErrorSeen
, &rdev
->flags
);
459 if (!test_and_set_bit(WantReplacement
, &rdev
->flags
))
460 set_bit(MD_RECOVERY_NEEDED
,
461 &rdev
->mddev
->recovery
);
462 set_bit(R10BIO_WriteError
, &r10_bio
->state
);
467 * Set R10BIO_Uptodate in our master bio, so that
468 * we will return a good error code for to the higher
469 * levels even if IO on some other mirrored buffer fails.
471 * The 'master' represents the composite IO operation to
472 * user-side. So if something waits for IO, then it will
473 * wait for the 'master' bio.
478 set_bit(R10BIO_Uptodate
, &r10_bio
->state
);
480 /* Maybe we can clear some bad blocks. */
481 if (is_badblock(rdev
,
482 r10_bio
->devs
[slot
].addr
,
484 &first_bad
, &bad_sectors
)) {
487 r10_bio
->devs
[slot
].repl_bio
= IO_MADE_GOOD
;
489 r10_bio
->devs
[slot
].bio
= IO_MADE_GOOD
;
491 set_bit(R10BIO_MadeGood
, &r10_bio
->state
);
497 * Let's see if all mirrored write operations have finished
500 one_write_done(r10_bio
);
502 rdev_dec_pending(conf
->mirrors
[dev
].rdev
, conf
->mddev
);
506 * RAID10 layout manager
507 * As well as the chunksize and raid_disks count, there are two
508 * parameters: near_copies and far_copies.
509 * near_copies * far_copies must be <= raid_disks.
510 * Normally one of these will be 1.
511 * If both are 1, we get raid0.
512 * If near_copies == raid_disks, we get raid1.
514 * Chunks are laid out in raid0 style with near_copies copies of the
515 * first chunk, followed by near_copies copies of the next chunk and
517 * If far_copies > 1, then after 1/far_copies of the array has been assigned
518 * as described above, we start again with a device offset of near_copies.
519 * So we effectively have another copy of the whole array further down all
520 * the drives, but with blocks on different drives.
521 * With this layout, and block is never stored twice on the one device.
523 * raid10_find_phys finds the sector offset of a given virtual sector
524 * on each device that it is on.
526 * raid10_find_virt does the reverse mapping, from a device and a
527 * sector offset to a virtual address
530 static void __raid10_find_phys(struct geom
*geo
, struct r10bio
*r10bio
)
539 /* now calculate first sector/dev */
540 chunk
= r10bio
->sector
>> geo
->chunk_shift
;
541 sector
= r10bio
->sector
& geo
->chunk_mask
;
543 chunk
*= geo
->near_copies
;
545 dev
= sector_div(stripe
, geo
->raid_disks
);
547 stripe
*= geo
->far_copies
;
549 sector
+= stripe
<< geo
->chunk_shift
;
551 /* and calculate all the others */
552 for (n
= 0; n
< geo
->near_copies
; n
++) {
555 r10bio
->devs
[slot
].addr
= sector
;
556 r10bio
->devs
[slot
].devnum
= d
;
559 for (f
= 1; f
< geo
->far_copies
; f
++) {
560 d
+= geo
->near_copies
;
561 if (d
>= geo
->raid_disks
)
562 d
-= geo
->raid_disks
;
564 r10bio
->devs
[slot
].devnum
= d
;
565 r10bio
->devs
[slot
].addr
= s
;
569 if (dev
>= geo
->raid_disks
) {
571 sector
+= (geo
->chunk_mask
+ 1);
576 static void raid10_find_phys(struct r10conf
*conf
, struct r10bio
*r10bio
)
578 struct geom
*geo
= &conf
->geo
;
580 if (conf
->reshape_progress
!= MaxSector
&&
581 ((r10bio
->sector
>= conf
->reshape_progress
) !=
582 conf
->mddev
->reshape_backwards
)) {
583 set_bit(R10BIO_Previous
, &r10bio
->state
);
586 clear_bit(R10BIO_Previous
, &r10bio
->state
);
588 __raid10_find_phys(geo
, r10bio
);
591 static sector_t
raid10_find_virt(struct r10conf
*conf
, sector_t sector
, int dev
)
593 sector_t offset
, chunk
, vchunk
;
594 /* Never use conf->prev as this is only called during resync
595 * or recovery, so reshape isn't happening
597 struct geom
*geo
= &conf
->geo
;
599 offset
= sector
& geo
->chunk_mask
;
600 if (geo
->far_offset
) {
602 chunk
= sector
>> geo
->chunk_shift
;
603 fc
= sector_div(chunk
, geo
->far_copies
);
604 dev
-= fc
* geo
->near_copies
;
606 dev
+= geo
->raid_disks
;
608 while (sector
>= geo
->stride
) {
609 sector
-= geo
->stride
;
610 if (dev
< geo
->near_copies
)
611 dev
+= geo
->raid_disks
- geo
->near_copies
;
613 dev
-= geo
->near_copies
;
615 chunk
= sector
>> geo
->chunk_shift
;
617 vchunk
= chunk
* geo
->raid_disks
+ dev
;
618 sector_div(vchunk
, geo
->near_copies
);
619 return (vchunk
<< geo
->chunk_shift
) + offset
;
623 * raid10_mergeable_bvec -- tell bio layer if a two requests can be merged
625 * @bvm: properties of new bio
626 * @biovec: the request that could be merged to it.
628 * Return amount of bytes we can accept at this offset
629 * This requires checking for end-of-chunk if near_copies != raid_disks,
630 * and for subordinate merge_bvec_fns if merge_check_needed.
632 static int raid10_mergeable_bvec(struct request_queue
*q
,
633 struct bvec_merge_data
*bvm
,
634 struct bio_vec
*biovec
)
636 struct mddev
*mddev
= q
->queuedata
;
637 struct r10conf
*conf
= mddev
->private;
638 sector_t sector
= bvm
->bi_sector
+ get_start_sect(bvm
->bi_bdev
);
640 unsigned int chunk_sectors
;
641 unsigned int bio_sectors
= bvm
->bi_size
>> 9;
642 struct geom
*geo
= &conf
->geo
;
644 chunk_sectors
= (conf
->geo
.chunk_mask
& conf
->prev
.chunk_mask
) + 1;
645 if (conf
->reshape_progress
!= MaxSector
&&
646 ((sector
>= conf
->reshape_progress
) !=
647 conf
->mddev
->reshape_backwards
))
650 if (geo
->near_copies
< geo
->raid_disks
) {
651 max
= (chunk_sectors
- ((sector
& (chunk_sectors
- 1))
652 + bio_sectors
)) << 9;
654 /* bio_add cannot handle a negative return */
656 if (max
<= biovec
->bv_len
&& bio_sectors
== 0)
657 return biovec
->bv_len
;
659 max
= biovec
->bv_len
;
661 if (mddev
->merge_check_needed
) {
663 struct r10bio r10_bio
;
664 struct r10dev devs
[conf
->copies
];
666 struct r10bio
*r10_bio
= &on_stack
.r10_bio
;
668 if (conf
->reshape_progress
!= MaxSector
) {
669 /* Cannot give any guidance during reshape */
670 if (max
<= biovec
->bv_len
&& bio_sectors
== 0)
671 return biovec
->bv_len
;
674 r10_bio
->sector
= sector
;
675 raid10_find_phys(conf
, r10_bio
);
677 for (s
= 0; s
< conf
->copies
; s
++) {
678 int disk
= r10_bio
->devs
[s
].devnum
;
679 struct md_rdev
*rdev
= rcu_dereference(
680 conf
->mirrors
[disk
].rdev
);
681 if (rdev
&& !test_bit(Faulty
, &rdev
->flags
)) {
682 struct request_queue
*q
=
683 bdev_get_queue(rdev
->bdev
);
684 if (q
->merge_bvec_fn
) {
685 bvm
->bi_sector
= r10_bio
->devs
[s
].addr
687 bvm
->bi_bdev
= rdev
->bdev
;
688 max
= min(max
, q
->merge_bvec_fn(
692 rdev
= rcu_dereference(conf
->mirrors
[disk
].replacement
);
693 if (rdev
&& !test_bit(Faulty
, &rdev
->flags
)) {
694 struct request_queue
*q
=
695 bdev_get_queue(rdev
->bdev
);
696 if (q
->merge_bvec_fn
) {
697 bvm
->bi_sector
= r10_bio
->devs
[s
].addr
699 bvm
->bi_bdev
= rdev
->bdev
;
700 max
= min(max
, q
->merge_bvec_fn(
711 * This routine returns the disk from which the requested read should
712 * be done. There is a per-array 'next expected sequential IO' sector
713 * number - if this matches on the next IO then we use the last disk.
714 * There is also a per-disk 'last know head position' sector that is
715 * maintained from IRQ contexts, both the normal and the resync IO
716 * completion handlers update this position correctly. If there is no
717 * perfect sequential match then we pick the disk whose head is closest.
719 * If there are 2 mirrors in the same 2 devices, performance degrades
720 * because position is mirror, not device based.
722 * The rdev for the device selected will have nr_pending incremented.
726 * FIXME: possibly should rethink readbalancing and do it differently
727 * depending on near_copies / far_copies geometry.
729 static struct md_rdev
*read_balance(struct r10conf
*conf
,
730 struct r10bio
*r10_bio
,
733 const sector_t this_sector
= r10_bio
->sector
;
735 int sectors
= r10_bio
->sectors
;
736 int best_good_sectors
;
737 sector_t new_distance
, best_dist
;
738 struct md_rdev
*best_rdev
, *rdev
= NULL
;
741 struct geom
*geo
= &conf
->geo
;
743 raid10_find_phys(conf
, r10_bio
);
746 sectors
= r10_bio
->sectors
;
749 best_dist
= MaxSector
;
750 best_good_sectors
= 0;
753 * Check if we can balance. We can balance on the whole
754 * device if no resync is going on (recovery is ok), or below
755 * the resync window. We take the first readable disk when
756 * above the resync window.
758 if (conf
->mddev
->recovery_cp
< MaxSector
759 && (this_sector
+ sectors
>= conf
->next_resync
))
762 for (slot
= 0; slot
< conf
->copies
; slot
++) {
767 if (r10_bio
->devs
[slot
].bio
== IO_BLOCKED
)
769 disk
= r10_bio
->devs
[slot
].devnum
;
770 rdev
= rcu_dereference(conf
->mirrors
[disk
].replacement
);
771 if (rdev
== NULL
|| test_bit(Faulty
, &rdev
->flags
) ||
772 test_bit(Unmerged
, &rdev
->flags
) ||
773 r10_bio
->devs
[slot
].addr
+ sectors
> rdev
->recovery_offset
)
774 rdev
= rcu_dereference(conf
->mirrors
[disk
].rdev
);
776 test_bit(Faulty
, &rdev
->flags
) ||
777 test_bit(Unmerged
, &rdev
->flags
))
779 if (!test_bit(In_sync
, &rdev
->flags
) &&
780 r10_bio
->devs
[slot
].addr
+ sectors
> rdev
->recovery_offset
)
783 dev_sector
= r10_bio
->devs
[slot
].addr
;
784 if (is_badblock(rdev
, dev_sector
, sectors
,
785 &first_bad
, &bad_sectors
)) {
786 if (best_dist
< MaxSector
)
787 /* Already have a better slot */
789 if (first_bad
<= dev_sector
) {
790 /* Cannot read here. If this is the
791 * 'primary' device, then we must not read
792 * beyond 'bad_sectors' from another device.
794 bad_sectors
-= (dev_sector
- first_bad
);
795 if (!do_balance
&& sectors
> bad_sectors
)
796 sectors
= bad_sectors
;
797 if (best_good_sectors
> sectors
)
798 best_good_sectors
= sectors
;
800 sector_t good_sectors
=
801 first_bad
- dev_sector
;
802 if (good_sectors
> best_good_sectors
) {
803 best_good_sectors
= good_sectors
;
808 /* Must read from here */
813 best_good_sectors
= sectors
;
818 /* This optimisation is debatable, and completely destroys
819 * sequential read speed for 'far copies' arrays. So only
820 * keep it for 'near' arrays, and review those later.
822 if (geo
->near_copies
> 1 && !atomic_read(&rdev
->nr_pending
))
825 /* for far > 1 always use the lowest address */
826 if (geo
->far_copies
> 1)
827 new_distance
= r10_bio
->devs
[slot
].addr
;
829 new_distance
= abs(r10_bio
->devs
[slot
].addr
-
830 conf
->mirrors
[disk
].head_position
);
831 if (new_distance
< best_dist
) {
832 best_dist
= new_distance
;
837 if (slot
>= conf
->copies
) {
843 atomic_inc(&rdev
->nr_pending
);
844 if (test_bit(Faulty
, &rdev
->flags
)) {
845 /* Cannot risk returning a device that failed
846 * before we inc'ed nr_pending
848 rdev_dec_pending(rdev
, conf
->mddev
);
851 r10_bio
->read_slot
= slot
;
855 *max_sectors
= best_good_sectors
;
860 int md_raid10_congested(struct mddev
*mddev
, int bits
)
862 struct r10conf
*conf
= mddev
->private;
865 if ((bits
& (1 << BDI_async_congested
)) &&
866 conf
->pending_count
>= max_queued_requests
)
871 (i
< conf
->geo
.raid_disks
|| i
< conf
->prev
.raid_disks
)
874 struct md_rdev
*rdev
= rcu_dereference(conf
->mirrors
[i
].rdev
);
875 if (rdev
&& !test_bit(Faulty
, &rdev
->flags
)) {
876 struct request_queue
*q
= bdev_get_queue(rdev
->bdev
);
878 ret
|= bdi_congested(&q
->backing_dev_info
, bits
);
884 EXPORT_SYMBOL_GPL(md_raid10_congested
);
886 static int raid10_congested(void *data
, int bits
)
888 struct mddev
*mddev
= data
;
890 return mddev_congested(mddev
, bits
) ||
891 md_raid10_congested(mddev
, bits
);
894 static void flush_pending_writes(struct r10conf
*conf
)
896 /* Any writes that have been queued but are awaiting
897 * bitmap updates get flushed here.
899 spin_lock_irq(&conf
->device_lock
);
901 if (conf
->pending_bio_list
.head
) {
903 bio
= bio_list_get(&conf
->pending_bio_list
);
904 conf
->pending_count
= 0;
905 spin_unlock_irq(&conf
->device_lock
);
906 /* flush any pending bitmap writes to disk
907 * before proceeding w/ I/O */
908 bitmap_unplug(conf
->mddev
->bitmap
);
909 wake_up(&conf
->wait_barrier
);
911 while (bio
) { /* submit pending writes */
912 struct bio
*next
= bio
->bi_next
;
914 generic_make_request(bio
);
918 spin_unlock_irq(&conf
->device_lock
);
922 * Sometimes we need to suspend IO while we do something else,
923 * either some resync/recovery, or reconfigure the array.
924 * To do this we raise a 'barrier'.
925 * The 'barrier' is a counter that can be raised multiple times
926 * to count how many activities are happening which preclude
928 * We can only raise the barrier if there is no pending IO.
929 * i.e. if nr_pending == 0.
930 * We choose only to raise the barrier if no-one is waiting for the
931 * barrier to go down. This means that as soon as an IO request
932 * is ready, no other operations which require a barrier will start
933 * until the IO request has had a chance.
935 * So: regular IO calls 'wait_barrier'. When that returns there
936 * is no backgroup IO happening, It must arrange to call
937 * allow_barrier when it has finished its IO.
938 * backgroup IO calls must call raise_barrier. Once that returns
939 * there is no normal IO happeing. It must arrange to call
940 * lower_barrier when the particular background IO completes.
943 static void raise_barrier(struct r10conf
*conf
, int force
)
945 BUG_ON(force
&& !conf
->barrier
);
946 spin_lock_irq(&conf
->resync_lock
);
948 /* Wait until no block IO is waiting (unless 'force') */
949 wait_event_lock_irq(conf
->wait_barrier
, force
|| !conf
->nr_waiting
,
950 conf
->resync_lock
, );
952 /* block any new IO from starting */
955 /* Now wait for all pending IO to complete */
956 wait_event_lock_irq(conf
->wait_barrier
,
957 !conf
->nr_pending
&& conf
->barrier
< RESYNC_DEPTH
,
958 conf
->resync_lock
, );
960 spin_unlock_irq(&conf
->resync_lock
);
963 static void lower_barrier(struct r10conf
*conf
)
966 spin_lock_irqsave(&conf
->resync_lock
, flags
);
968 spin_unlock_irqrestore(&conf
->resync_lock
, flags
);
969 wake_up(&conf
->wait_barrier
);
972 static void wait_barrier(struct r10conf
*conf
)
974 spin_lock_irq(&conf
->resync_lock
);
977 /* Wait for the barrier to drop.
978 * However if there are already pending
979 * requests (preventing the barrier from
980 * rising completely), and the
981 * pre-process bio queue isn't empty,
982 * then don't wait, as we need to empty
983 * that queue to get the nr_pending
986 wait_event_lock_irq(conf
->wait_barrier
,
990 !bio_list_empty(current
->bio_list
)),
996 spin_unlock_irq(&conf
->resync_lock
);
999 static void allow_barrier(struct r10conf
*conf
)
1001 unsigned long flags
;
1002 spin_lock_irqsave(&conf
->resync_lock
, flags
);
1004 spin_unlock_irqrestore(&conf
->resync_lock
, flags
);
1005 wake_up(&conf
->wait_barrier
);
1008 static void freeze_array(struct r10conf
*conf
)
1010 /* stop syncio and normal IO and wait for everything to
1012 * We increment barrier and nr_waiting, and then
1013 * wait until nr_pending match nr_queued+1
1014 * This is called in the context of one normal IO request
1015 * that has failed. Thus any sync request that might be pending
1016 * will be blocked by nr_pending, and we need to wait for
1017 * pending IO requests to complete or be queued for re-try.
1018 * Thus the number queued (nr_queued) plus this request (1)
1019 * must match the number of pending IOs (nr_pending) before
1022 spin_lock_irq(&conf
->resync_lock
);
1025 wait_event_lock_irq(conf
->wait_barrier
,
1026 conf
->nr_pending
== conf
->nr_queued
+1,
1028 flush_pending_writes(conf
));
1030 spin_unlock_irq(&conf
->resync_lock
);
1033 static void unfreeze_array(struct r10conf
*conf
)
1035 /* reverse the effect of the freeze */
1036 spin_lock_irq(&conf
->resync_lock
);
1039 wake_up(&conf
->wait_barrier
);
1040 spin_unlock_irq(&conf
->resync_lock
);
1043 static sector_t
choose_data_offset(struct r10bio
*r10_bio
,
1044 struct md_rdev
*rdev
)
1046 if (!test_bit(MD_RECOVERY_RESHAPE
, &rdev
->mddev
->recovery
) ||
1047 test_bit(R10BIO_Previous
, &r10_bio
->state
))
1048 return rdev
->data_offset
;
1050 return rdev
->new_data_offset
;
1053 static void make_request(struct mddev
*mddev
, struct bio
* bio
)
1055 struct r10conf
*conf
= mddev
->private;
1056 struct r10bio
*r10_bio
;
1057 struct bio
*read_bio
;
1059 sector_t chunk_mask
= (conf
->geo
.chunk_mask
& conf
->prev
.chunk_mask
);
1060 int chunk_sects
= chunk_mask
+ 1;
1061 const int rw
= bio_data_dir(bio
);
1062 const unsigned long do_sync
= (bio
->bi_rw
& REQ_SYNC
);
1063 const unsigned long do_fua
= (bio
->bi_rw
& REQ_FUA
);
1064 unsigned long flags
;
1065 struct md_rdev
*blocked_rdev
;
1066 int sectors_handled
;
1070 if (unlikely(bio
->bi_rw
& REQ_FLUSH
)) {
1071 md_flush_request(mddev
, bio
);
1075 /* If this request crosses a chunk boundary, we need to
1076 * split it. This will only happen for 1 PAGE (or less) requests.
1078 if (unlikely((bio
->bi_sector
& chunk_mask
) + (bio
->bi_size
>> 9)
1080 && (conf
->geo
.near_copies
< conf
->geo
.raid_disks
1081 || conf
->prev
.near_copies
< conf
->prev
.raid_disks
))) {
1082 struct bio_pair
*bp
;
1083 /* Sanity check -- queue functions should prevent this happening */
1084 if (bio
->bi_vcnt
!= 1 ||
1087 /* This is a one page bio that upper layers
1088 * refuse to split for us, so we need to split it.
1091 chunk_sects
- (bio
->bi_sector
& (chunk_sects
- 1)) );
1093 /* Each of these 'make_request' calls will call 'wait_barrier'.
1094 * If the first succeeds but the second blocks due to the resync
1095 * thread raising the barrier, we will deadlock because the
1096 * IO to the underlying device will be queued in generic_make_request
1097 * and will never complete, so will never reduce nr_pending.
1098 * So increment nr_waiting here so no new raise_barriers will
1099 * succeed, and so the second wait_barrier cannot block.
1101 spin_lock_irq(&conf
->resync_lock
);
1103 spin_unlock_irq(&conf
->resync_lock
);
1105 make_request(mddev
, &bp
->bio1
);
1106 make_request(mddev
, &bp
->bio2
);
1108 spin_lock_irq(&conf
->resync_lock
);
1110 wake_up(&conf
->wait_barrier
);
1111 spin_unlock_irq(&conf
->resync_lock
);
1113 bio_pair_release(bp
);
1116 printk("md/raid10:%s: make_request bug: can't convert block across chunks"
1117 " or bigger than %dk %llu %d\n", mdname(mddev
), chunk_sects
/2,
1118 (unsigned long long)bio
->bi_sector
, bio
->bi_size
>> 10);
1124 md_write_start(mddev
, bio
);
1127 * Register the new request and wait if the reconstruction
1128 * thread has put up a bar for new requests.
1129 * Continue immediately if no resync is active currently.
1133 sectors
= bio
->bi_size
>> 9;
1134 while (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
1135 bio
->bi_sector
< conf
->reshape_progress
&&
1136 bio
->bi_sector
+ sectors
> conf
->reshape_progress
) {
1137 /* IO spans the reshape position. Need to wait for
1140 allow_barrier(conf
);
1141 wait_event(conf
->wait_barrier
,
1142 conf
->reshape_progress
<= bio
->bi_sector
||
1143 conf
->reshape_progress
>= bio
->bi_sector
+ sectors
);
1146 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
1147 bio_data_dir(bio
) == WRITE
&&
1148 (mddev
->reshape_backwards
1149 ? (bio
->bi_sector
< conf
->reshape_safe
&&
1150 bio
->bi_sector
+ sectors
> conf
->reshape_progress
)
1151 : (bio
->bi_sector
+ sectors
> conf
->reshape_safe
&&
1152 bio
->bi_sector
< conf
->reshape_progress
))) {
1153 /* Need to update reshape_position in metadata */
1154 mddev
->reshape_position
= conf
->reshape_progress
;
1155 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
1156 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
1157 md_wakeup_thread(mddev
->thread
);
1158 wait_event(mddev
->sb_wait
,
1159 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
1161 conf
->reshape_safe
= mddev
->reshape_position
;
1164 r10_bio
= mempool_alloc(conf
->r10bio_pool
, GFP_NOIO
);
1166 r10_bio
->master_bio
= bio
;
1167 r10_bio
->sectors
= sectors
;
1169 r10_bio
->mddev
= mddev
;
1170 r10_bio
->sector
= bio
->bi_sector
;
1173 /* We might need to issue multiple reads to different
1174 * devices if there are bad blocks around, so we keep
1175 * track of the number of reads in bio->bi_phys_segments.
1176 * If this is 0, there is only one r10_bio and no locking
1177 * will be needed when the request completes. If it is
1178 * non-zero, then it is the number of not-completed requests.
1180 bio
->bi_phys_segments
= 0;
1181 clear_bit(BIO_SEG_VALID
, &bio
->bi_flags
);
1185 * read balancing logic:
1187 struct md_rdev
*rdev
;
1191 rdev
= read_balance(conf
, r10_bio
, &max_sectors
);
1193 raid_end_bio_io(r10_bio
);
1196 slot
= r10_bio
->read_slot
;
1198 read_bio
= bio_clone_mddev(bio
, GFP_NOIO
, mddev
);
1199 md_trim_bio(read_bio
, r10_bio
->sector
- bio
->bi_sector
,
1202 r10_bio
->devs
[slot
].bio
= read_bio
;
1203 r10_bio
->devs
[slot
].rdev
= rdev
;
1205 read_bio
->bi_sector
= r10_bio
->devs
[slot
].addr
+
1206 choose_data_offset(r10_bio
, rdev
);
1207 read_bio
->bi_bdev
= rdev
->bdev
;
1208 read_bio
->bi_end_io
= raid10_end_read_request
;
1209 read_bio
->bi_rw
= READ
| do_sync
;
1210 read_bio
->bi_private
= r10_bio
;
1212 if (max_sectors
< r10_bio
->sectors
) {
1213 /* Could not read all from this device, so we will
1214 * need another r10_bio.
1216 sectors_handled
= (r10_bio
->sectors
+ max_sectors
1218 r10_bio
->sectors
= max_sectors
;
1219 spin_lock_irq(&conf
->device_lock
);
1220 if (bio
->bi_phys_segments
== 0)
1221 bio
->bi_phys_segments
= 2;
1223 bio
->bi_phys_segments
++;
1224 spin_unlock(&conf
->device_lock
);
1225 /* Cannot call generic_make_request directly
1226 * as that will be queued in __generic_make_request
1227 * and subsequent mempool_alloc might block
1228 * waiting for it. so hand bio over to raid10d.
1230 reschedule_retry(r10_bio
);
1232 r10_bio
= mempool_alloc(conf
->r10bio_pool
, GFP_NOIO
);
1234 r10_bio
->master_bio
= bio
;
1235 r10_bio
->sectors
= ((bio
->bi_size
>> 9)
1238 r10_bio
->mddev
= mddev
;
1239 r10_bio
->sector
= bio
->bi_sector
+ sectors_handled
;
1242 generic_make_request(read_bio
);
1249 if (conf
->pending_count
>= max_queued_requests
) {
1250 md_wakeup_thread(mddev
->thread
);
1251 wait_event(conf
->wait_barrier
,
1252 conf
->pending_count
< max_queued_requests
);
1254 /* first select target devices under rcu_lock and
1255 * inc refcount on their rdev. Record them by setting
1257 * If there are known/acknowledged bad blocks on any device
1258 * on which we have seen a write error, we want to avoid
1259 * writing to those blocks. This potentially requires several
1260 * writes to write around the bad blocks. Each set of writes
1261 * gets its own r10_bio with a set of bios attached. The number
1262 * of r10_bios is recored in bio->bi_phys_segments just as with
1266 r10_bio
->read_slot
= -1; /* make sure repl_bio gets freed */
1267 raid10_find_phys(conf
, r10_bio
);
1269 blocked_rdev
= NULL
;
1271 max_sectors
= r10_bio
->sectors
;
1273 for (i
= 0; i
< conf
->copies
; i
++) {
1274 int d
= r10_bio
->devs
[i
].devnum
;
1275 struct md_rdev
*rdev
= rcu_dereference(conf
->mirrors
[d
].rdev
);
1276 struct md_rdev
*rrdev
= rcu_dereference(
1277 conf
->mirrors
[d
].replacement
);
1280 if (rdev
&& unlikely(test_bit(Blocked
, &rdev
->flags
))) {
1281 atomic_inc(&rdev
->nr_pending
);
1282 blocked_rdev
= rdev
;
1285 if (rrdev
&& unlikely(test_bit(Blocked
, &rrdev
->flags
))) {
1286 atomic_inc(&rrdev
->nr_pending
);
1287 blocked_rdev
= rrdev
;
1290 if (rrdev
&& (test_bit(Faulty
, &rrdev
->flags
)
1291 || test_bit(Unmerged
, &rrdev
->flags
)))
1294 r10_bio
->devs
[i
].bio
= NULL
;
1295 r10_bio
->devs
[i
].repl_bio
= NULL
;
1296 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
) ||
1297 test_bit(Unmerged
, &rdev
->flags
)) {
1298 set_bit(R10BIO_Degraded
, &r10_bio
->state
);
1301 if (test_bit(WriteErrorSeen
, &rdev
->flags
)) {
1303 sector_t dev_sector
= r10_bio
->devs
[i
].addr
;
1307 is_bad
= is_badblock(rdev
, dev_sector
,
1309 &first_bad
, &bad_sectors
);
1311 /* Mustn't write here until the bad block
1314 atomic_inc(&rdev
->nr_pending
);
1315 set_bit(BlockedBadBlocks
, &rdev
->flags
);
1316 blocked_rdev
= rdev
;
1319 if (is_bad
&& first_bad
<= dev_sector
) {
1320 /* Cannot write here at all */
1321 bad_sectors
-= (dev_sector
- first_bad
);
1322 if (bad_sectors
< max_sectors
)
1323 /* Mustn't write more than bad_sectors
1324 * to other devices yet
1326 max_sectors
= bad_sectors
;
1327 /* We don't set R10BIO_Degraded as that
1328 * only applies if the disk is missing,
1329 * so it might be re-added, and we want to
1330 * know to recover this chunk.
1331 * In this case the device is here, and the
1332 * fact that this chunk is not in-sync is
1333 * recorded in the bad block log.
1338 int good_sectors
= first_bad
- dev_sector
;
1339 if (good_sectors
< max_sectors
)
1340 max_sectors
= good_sectors
;
1343 r10_bio
->devs
[i
].bio
= bio
;
1344 atomic_inc(&rdev
->nr_pending
);
1346 r10_bio
->devs
[i
].repl_bio
= bio
;
1347 atomic_inc(&rrdev
->nr_pending
);
1352 if (unlikely(blocked_rdev
)) {
1353 /* Have to wait for this device to get unblocked, then retry */
1357 for (j
= 0; j
< i
; j
++) {
1358 if (r10_bio
->devs
[j
].bio
) {
1359 d
= r10_bio
->devs
[j
].devnum
;
1360 rdev_dec_pending(conf
->mirrors
[d
].rdev
, mddev
);
1362 if (r10_bio
->devs
[j
].repl_bio
) {
1363 struct md_rdev
*rdev
;
1364 d
= r10_bio
->devs
[j
].devnum
;
1365 rdev
= conf
->mirrors
[d
].replacement
;
1367 /* Race with remove_disk */
1369 rdev
= conf
->mirrors
[d
].rdev
;
1371 rdev_dec_pending(rdev
, mddev
);
1374 allow_barrier(conf
);
1375 md_wait_for_blocked_rdev(blocked_rdev
, mddev
);
1380 if (max_sectors
< r10_bio
->sectors
) {
1381 /* We are splitting this into multiple parts, so
1382 * we need to prepare for allocating another r10_bio.
1384 r10_bio
->sectors
= max_sectors
;
1385 spin_lock_irq(&conf
->device_lock
);
1386 if (bio
->bi_phys_segments
== 0)
1387 bio
->bi_phys_segments
= 2;
1389 bio
->bi_phys_segments
++;
1390 spin_unlock_irq(&conf
->device_lock
);
1392 sectors_handled
= r10_bio
->sector
+ max_sectors
- bio
->bi_sector
;
1394 atomic_set(&r10_bio
->remaining
, 1);
1395 bitmap_startwrite(mddev
->bitmap
, r10_bio
->sector
, r10_bio
->sectors
, 0);
1397 for (i
= 0; i
< conf
->copies
; i
++) {
1399 int d
= r10_bio
->devs
[i
].devnum
;
1400 if (!r10_bio
->devs
[i
].bio
)
1403 mbio
= bio_clone_mddev(bio
, GFP_NOIO
, mddev
);
1404 md_trim_bio(mbio
, r10_bio
->sector
- bio
->bi_sector
,
1406 r10_bio
->devs
[i
].bio
= mbio
;
1408 mbio
->bi_sector
= (r10_bio
->devs
[i
].addr
+
1409 choose_data_offset(r10_bio
,
1410 conf
->mirrors
[d
].rdev
));
1411 mbio
->bi_bdev
= conf
->mirrors
[d
].rdev
->bdev
;
1412 mbio
->bi_end_io
= raid10_end_write_request
;
1413 mbio
->bi_rw
= WRITE
| do_sync
| do_fua
;
1414 mbio
->bi_private
= r10_bio
;
1416 atomic_inc(&r10_bio
->remaining
);
1417 spin_lock_irqsave(&conf
->device_lock
, flags
);
1418 bio_list_add(&conf
->pending_bio_list
, mbio
);
1419 conf
->pending_count
++;
1420 spin_unlock_irqrestore(&conf
->device_lock
, flags
);
1421 if (!mddev_check_plugged(mddev
))
1422 md_wakeup_thread(mddev
->thread
);
1424 if (!r10_bio
->devs
[i
].repl_bio
)
1427 mbio
= bio_clone_mddev(bio
, GFP_NOIO
, mddev
);
1428 md_trim_bio(mbio
, r10_bio
->sector
- bio
->bi_sector
,
1430 r10_bio
->devs
[i
].repl_bio
= mbio
;
1432 /* We are actively writing to the original device
1433 * so it cannot disappear, so the replacement cannot
1436 mbio
->bi_sector
= (r10_bio
->devs
[i
].addr
+
1439 conf
->mirrors
[d
].replacement
));
1440 mbio
->bi_bdev
= conf
->mirrors
[d
].replacement
->bdev
;
1441 mbio
->bi_end_io
= raid10_end_write_request
;
1442 mbio
->bi_rw
= WRITE
| do_sync
| do_fua
;
1443 mbio
->bi_private
= r10_bio
;
1445 atomic_inc(&r10_bio
->remaining
);
1446 spin_lock_irqsave(&conf
->device_lock
, flags
);
1447 bio_list_add(&conf
->pending_bio_list
, mbio
);
1448 conf
->pending_count
++;
1449 spin_unlock_irqrestore(&conf
->device_lock
, flags
);
1450 if (!mddev_check_plugged(mddev
))
1451 md_wakeup_thread(mddev
->thread
);
1454 /* Don't remove the bias on 'remaining' (one_write_done) until
1455 * after checking if we need to go around again.
1458 if (sectors_handled
< (bio
->bi_size
>> 9)) {
1459 one_write_done(r10_bio
);
1460 /* We need another r10_bio. It has already been counted
1461 * in bio->bi_phys_segments.
1463 r10_bio
= mempool_alloc(conf
->r10bio_pool
, GFP_NOIO
);
1465 r10_bio
->master_bio
= bio
;
1466 r10_bio
->sectors
= (bio
->bi_size
>> 9) - sectors_handled
;
1468 r10_bio
->mddev
= mddev
;
1469 r10_bio
->sector
= bio
->bi_sector
+ sectors_handled
;
1473 one_write_done(r10_bio
);
1475 /* In case raid10d snuck in to freeze_array */
1476 wake_up(&conf
->wait_barrier
);
1479 static void status(struct seq_file
*seq
, struct mddev
*mddev
)
1481 struct r10conf
*conf
= mddev
->private;
1484 if (conf
->geo
.near_copies
< conf
->geo
.raid_disks
)
1485 seq_printf(seq
, " %dK chunks", mddev
->chunk_sectors
/ 2);
1486 if (conf
->geo
.near_copies
> 1)
1487 seq_printf(seq
, " %d near-copies", conf
->geo
.near_copies
);
1488 if (conf
->geo
.far_copies
> 1) {
1489 if (conf
->geo
.far_offset
)
1490 seq_printf(seq
, " %d offset-copies", conf
->geo
.far_copies
);
1492 seq_printf(seq
, " %d far-copies", conf
->geo
.far_copies
);
1494 seq_printf(seq
, " [%d/%d] [", conf
->geo
.raid_disks
,
1495 conf
->geo
.raid_disks
- mddev
->degraded
);
1496 for (i
= 0; i
< conf
->geo
.raid_disks
; i
++)
1497 seq_printf(seq
, "%s",
1498 conf
->mirrors
[i
].rdev
&&
1499 test_bit(In_sync
, &conf
->mirrors
[i
].rdev
->flags
) ? "U" : "_");
1500 seq_printf(seq
, "]");
1503 /* check if there are enough drives for
1504 * every block to appear on atleast one.
1505 * Don't consider the device numbered 'ignore'
1506 * as we might be about to remove it.
1508 static int _enough(struct r10conf
*conf
, struct geom
*geo
, int ignore
)
1513 int n
= conf
->copies
;
1516 if (conf
->mirrors
[first
].rdev
&&
1519 first
= (first
+1) % geo
->raid_disks
;
1523 } while (first
!= 0);
1527 static int enough(struct r10conf
*conf
, int ignore
)
1529 return _enough(conf
, &conf
->geo
, ignore
) &&
1530 _enough(conf
, &conf
->prev
, ignore
);
1533 static void error(struct mddev
*mddev
, struct md_rdev
*rdev
)
1535 char b
[BDEVNAME_SIZE
];
1536 struct r10conf
*conf
= mddev
->private;
1539 * If it is not operational, then we have already marked it as dead
1540 * else if it is the last working disks, ignore the error, let the
1541 * next level up know.
1542 * else mark the drive as failed
1544 if (test_bit(In_sync
, &rdev
->flags
)
1545 && !enough(conf
, rdev
->raid_disk
))
1547 * Don't fail the drive, just return an IO error.
1550 if (test_and_clear_bit(In_sync
, &rdev
->flags
)) {
1551 unsigned long flags
;
1552 spin_lock_irqsave(&conf
->device_lock
, flags
);
1554 spin_unlock_irqrestore(&conf
->device_lock
, flags
);
1556 * if recovery is running, make sure it aborts.
1558 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
1560 set_bit(Blocked
, &rdev
->flags
);
1561 set_bit(Faulty
, &rdev
->flags
);
1562 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
1564 "md/raid10:%s: Disk failure on %s, disabling device.\n"
1565 "md/raid10:%s: Operation continuing on %d devices.\n",
1566 mdname(mddev
), bdevname(rdev
->bdev
, b
),
1567 mdname(mddev
), conf
->geo
.raid_disks
- mddev
->degraded
);
1570 static void print_conf(struct r10conf
*conf
)
1573 struct raid10_info
*tmp
;
1575 printk(KERN_DEBUG
"RAID10 conf printout:\n");
1577 printk(KERN_DEBUG
"(!conf)\n");
1580 printk(KERN_DEBUG
" --- wd:%d rd:%d\n", conf
->geo
.raid_disks
- conf
->mddev
->degraded
,
1581 conf
->geo
.raid_disks
);
1583 for (i
= 0; i
< conf
->geo
.raid_disks
; i
++) {
1584 char b
[BDEVNAME_SIZE
];
1585 tmp
= conf
->mirrors
+ i
;
1587 printk(KERN_DEBUG
" disk %d, wo:%d, o:%d, dev:%s\n",
1588 i
, !test_bit(In_sync
, &tmp
->rdev
->flags
),
1589 !test_bit(Faulty
, &tmp
->rdev
->flags
),
1590 bdevname(tmp
->rdev
->bdev
,b
));
1594 static void close_sync(struct r10conf
*conf
)
1597 allow_barrier(conf
);
1599 mempool_destroy(conf
->r10buf_pool
);
1600 conf
->r10buf_pool
= NULL
;
1603 static int raid10_spare_active(struct mddev
*mddev
)
1606 struct r10conf
*conf
= mddev
->private;
1607 struct raid10_info
*tmp
;
1609 unsigned long flags
;
1612 * Find all non-in_sync disks within the RAID10 configuration
1613 * and mark them in_sync
1615 for (i
= 0; i
< conf
->geo
.raid_disks
; i
++) {
1616 tmp
= conf
->mirrors
+ i
;
1617 if (tmp
->replacement
1618 && tmp
->replacement
->recovery_offset
== MaxSector
1619 && !test_bit(Faulty
, &tmp
->replacement
->flags
)
1620 && !test_and_set_bit(In_sync
, &tmp
->replacement
->flags
)) {
1621 /* Replacement has just become active */
1623 || !test_and_clear_bit(In_sync
, &tmp
->rdev
->flags
))
1626 /* Replaced device not technically faulty,
1627 * but we need to be sure it gets removed
1628 * and never re-added.
1630 set_bit(Faulty
, &tmp
->rdev
->flags
);
1631 sysfs_notify_dirent_safe(
1632 tmp
->rdev
->sysfs_state
);
1634 sysfs_notify_dirent_safe(tmp
->replacement
->sysfs_state
);
1635 } else if (tmp
->rdev
1636 && !test_bit(Faulty
, &tmp
->rdev
->flags
)
1637 && !test_and_set_bit(In_sync
, &tmp
->rdev
->flags
)) {
1639 sysfs_notify_dirent(tmp
->rdev
->sysfs_state
);
1642 spin_lock_irqsave(&conf
->device_lock
, flags
);
1643 mddev
->degraded
-= count
;
1644 spin_unlock_irqrestore(&conf
->device_lock
, flags
);
1651 static int raid10_add_disk(struct mddev
*mddev
, struct md_rdev
*rdev
)
1653 struct r10conf
*conf
= mddev
->private;
1657 int last
= conf
->geo
.raid_disks
- 1;
1658 struct request_queue
*q
= bdev_get_queue(rdev
->bdev
);
1660 if (mddev
->recovery_cp
< MaxSector
)
1661 /* only hot-add to in-sync arrays, as recovery is
1662 * very different from resync
1665 if (rdev
->saved_raid_disk
< 0 && !_enough(conf
, &conf
->prev
, -1))
1668 if (rdev
->raid_disk
>= 0)
1669 first
= last
= rdev
->raid_disk
;
1671 if (q
->merge_bvec_fn
) {
1672 set_bit(Unmerged
, &rdev
->flags
);
1673 mddev
->merge_check_needed
= 1;
1676 if (rdev
->saved_raid_disk
>= first
&&
1677 conf
->mirrors
[rdev
->saved_raid_disk
].rdev
== NULL
)
1678 mirror
= rdev
->saved_raid_disk
;
1681 for ( ; mirror
<= last
; mirror
++) {
1682 struct raid10_info
*p
= &conf
->mirrors
[mirror
];
1683 if (p
->recovery_disabled
== mddev
->recovery_disabled
)
1686 if (!test_bit(WantReplacement
, &p
->rdev
->flags
) ||
1687 p
->replacement
!= NULL
)
1689 clear_bit(In_sync
, &rdev
->flags
);
1690 set_bit(Replacement
, &rdev
->flags
);
1691 rdev
->raid_disk
= mirror
;
1693 disk_stack_limits(mddev
->gendisk
, rdev
->bdev
,
1694 rdev
->data_offset
<< 9);
1696 rcu_assign_pointer(p
->replacement
, rdev
);
1700 disk_stack_limits(mddev
->gendisk
, rdev
->bdev
,
1701 rdev
->data_offset
<< 9);
1703 p
->head_position
= 0;
1704 p
->recovery_disabled
= mddev
->recovery_disabled
- 1;
1705 rdev
->raid_disk
= mirror
;
1707 if (rdev
->saved_raid_disk
!= mirror
)
1709 rcu_assign_pointer(p
->rdev
, rdev
);
1712 if (err
== 0 && test_bit(Unmerged
, &rdev
->flags
)) {
1713 /* Some requests might not have seen this new
1714 * merge_bvec_fn. We must wait for them to complete
1715 * before merging the device fully.
1716 * First we make sure any code which has tested
1717 * our function has submitted the request, then
1718 * we wait for all outstanding requests to complete.
1720 synchronize_sched();
1721 raise_barrier(conf
, 0);
1722 lower_barrier(conf
);
1723 clear_bit(Unmerged
, &rdev
->flags
);
1725 md_integrity_add_rdev(rdev
, mddev
);
1730 static int raid10_remove_disk(struct mddev
*mddev
, struct md_rdev
*rdev
)
1732 struct r10conf
*conf
= mddev
->private;
1734 int number
= rdev
->raid_disk
;
1735 struct md_rdev
**rdevp
;
1736 struct raid10_info
*p
= conf
->mirrors
+ number
;
1739 if (rdev
== p
->rdev
)
1741 else if (rdev
== p
->replacement
)
1742 rdevp
= &p
->replacement
;
1746 if (test_bit(In_sync
, &rdev
->flags
) ||
1747 atomic_read(&rdev
->nr_pending
)) {
1751 /* Only remove faulty devices if recovery
1754 if (!test_bit(Faulty
, &rdev
->flags
) &&
1755 mddev
->recovery_disabled
!= p
->recovery_disabled
&&
1756 (!p
->replacement
|| p
->replacement
== rdev
) &&
1757 number
< conf
->geo
.raid_disks
&&
1764 if (atomic_read(&rdev
->nr_pending
)) {
1765 /* lost the race, try later */
1769 } else if (p
->replacement
) {
1770 /* We must have just cleared 'rdev' */
1771 p
->rdev
= p
->replacement
;
1772 clear_bit(Replacement
, &p
->replacement
->flags
);
1773 smp_mb(); /* Make sure other CPUs may see both as identical
1774 * but will never see neither -- if they are careful.
1776 p
->replacement
= NULL
;
1777 clear_bit(WantReplacement
, &rdev
->flags
);
1779 /* We might have just remove the Replacement as faulty
1780 * Clear the flag just in case
1782 clear_bit(WantReplacement
, &rdev
->flags
);
1784 err
= md_integrity_register(mddev
);
1793 static void end_sync_read(struct bio
*bio
, int error
)
1795 struct r10bio
*r10_bio
= bio
->bi_private
;
1796 struct r10conf
*conf
= r10_bio
->mddev
->private;
1799 if (bio
== r10_bio
->master_bio
) {
1800 /* this is a reshape read */
1801 d
= r10_bio
->read_slot
; /* really the read dev */
1803 d
= find_bio_disk(conf
, r10_bio
, bio
, NULL
, NULL
);
1805 if (test_bit(BIO_UPTODATE
, &bio
->bi_flags
))
1806 set_bit(R10BIO_Uptodate
, &r10_bio
->state
);
1808 /* The write handler will notice the lack of
1809 * R10BIO_Uptodate and record any errors etc
1811 atomic_add(r10_bio
->sectors
,
1812 &conf
->mirrors
[d
].rdev
->corrected_errors
);
1814 /* for reconstruct, we always reschedule after a read.
1815 * for resync, only after all reads
1817 rdev_dec_pending(conf
->mirrors
[d
].rdev
, conf
->mddev
);
1818 if (test_bit(R10BIO_IsRecover
, &r10_bio
->state
) ||
1819 atomic_dec_and_test(&r10_bio
->remaining
)) {
1820 /* we have read all the blocks,
1821 * do the comparison in process context in raid10d
1823 reschedule_retry(r10_bio
);
1827 static void end_sync_request(struct r10bio
*r10_bio
)
1829 struct mddev
*mddev
= r10_bio
->mddev
;
1831 while (atomic_dec_and_test(&r10_bio
->remaining
)) {
1832 if (r10_bio
->master_bio
== NULL
) {
1833 /* the primary of several recovery bios */
1834 sector_t s
= r10_bio
->sectors
;
1835 if (test_bit(R10BIO_MadeGood
, &r10_bio
->state
) ||
1836 test_bit(R10BIO_WriteError
, &r10_bio
->state
))
1837 reschedule_retry(r10_bio
);
1840 md_done_sync(mddev
, s
, 1);
1843 struct r10bio
*r10_bio2
= (struct r10bio
*)r10_bio
->master_bio
;
1844 if (test_bit(R10BIO_MadeGood
, &r10_bio
->state
) ||
1845 test_bit(R10BIO_WriteError
, &r10_bio
->state
))
1846 reschedule_retry(r10_bio
);
1854 static void end_sync_write(struct bio
*bio
, int error
)
1856 int uptodate
= test_bit(BIO_UPTODATE
, &bio
->bi_flags
);
1857 struct r10bio
*r10_bio
= bio
->bi_private
;
1858 struct mddev
*mddev
= r10_bio
->mddev
;
1859 struct r10conf
*conf
= mddev
->private;
1865 struct md_rdev
*rdev
= NULL
;
1867 d
= find_bio_disk(conf
, r10_bio
, bio
, &slot
, &repl
);
1869 rdev
= conf
->mirrors
[d
].replacement
;
1871 rdev
= conf
->mirrors
[d
].rdev
;
1875 md_error(mddev
, rdev
);
1877 set_bit(WriteErrorSeen
, &rdev
->flags
);
1878 if (!test_and_set_bit(WantReplacement
, &rdev
->flags
))
1879 set_bit(MD_RECOVERY_NEEDED
,
1880 &rdev
->mddev
->recovery
);
1881 set_bit(R10BIO_WriteError
, &r10_bio
->state
);
1883 } else if (is_badblock(rdev
,
1884 r10_bio
->devs
[slot
].addr
,
1886 &first_bad
, &bad_sectors
))
1887 set_bit(R10BIO_MadeGood
, &r10_bio
->state
);
1889 rdev_dec_pending(rdev
, mddev
);
1891 end_sync_request(r10_bio
);
1895 * Note: sync and recover and handled very differently for raid10
1896 * This code is for resync.
1897 * For resync, we read through virtual addresses and read all blocks.
1898 * If there is any error, we schedule a write. The lowest numbered
1899 * drive is authoritative.
1900 * However requests come for physical address, so we need to map.
1901 * For every physical address there are raid_disks/copies virtual addresses,
1902 * which is always are least one, but is not necessarly an integer.
1903 * This means that a physical address can span multiple chunks, so we may
1904 * have to submit multiple io requests for a single sync request.
1907 * We check if all blocks are in-sync and only write to blocks that
1910 static void sync_request_write(struct mddev
*mddev
, struct r10bio
*r10_bio
)
1912 struct r10conf
*conf
= mddev
->private;
1914 struct bio
*tbio
, *fbio
;
1917 atomic_set(&r10_bio
->remaining
, 1);
1919 /* find the first device with a block */
1920 for (i
=0; i
<conf
->copies
; i
++)
1921 if (test_bit(BIO_UPTODATE
, &r10_bio
->devs
[i
].bio
->bi_flags
))
1924 if (i
== conf
->copies
)
1928 fbio
= r10_bio
->devs
[i
].bio
;
1930 vcnt
= (r10_bio
->sectors
+ (PAGE_SIZE
>> 9) - 1) >> (PAGE_SHIFT
- 9);
1931 /* now find blocks with errors */
1932 for (i
=0 ; i
< conf
->copies
; i
++) {
1935 tbio
= r10_bio
->devs
[i
].bio
;
1937 if (tbio
->bi_end_io
!= end_sync_read
)
1941 if (test_bit(BIO_UPTODATE
, &r10_bio
->devs
[i
].bio
->bi_flags
)) {
1942 /* We know that the bi_io_vec layout is the same for
1943 * both 'first' and 'i', so we just compare them.
1944 * All vec entries are PAGE_SIZE;
1946 for (j
= 0; j
< vcnt
; j
++)
1947 if (memcmp(page_address(fbio
->bi_io_vec
[j
].bv_page
),
1948 page_address(tbio
->bi_io_vec
[j
].bv_page
),
1949 fbio
->bi_io_vec
[j
].bv_len
))
1953 mddev
->resync_mismatches
+= r10_bio
->sectors
;
1954 if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
1955 /* Don't fix anything. */
1958 /* Ok, we need to write this bio, either to correct an
1959 * inconsistency or to correct an unreadable block.
1960 * First we need to fixup bv_offset, bv_len and
1961 * bi_vecs, as the read request might have corrupted these
1963 tbio
->bi_vcnt
= vcnt
;
1964 tbio
->bi_size
= r10_bio
->sectors
<< 9;
1966 tbio
->bi_phys_segments
= 0;
1967 tbio
->bi_flags
&= ~(BIO_POOL_MASK
- 1);
1968 tbio
->bi_flags
|= 1 << BIO_UPTODATE
;
1969 tbio
->bi_next
= NULL
;
1970 tbio
->bi_rw
= WRITE
;
1971 tbio
->bi_private
= r10_bio
;
1972 tbio
->bi_sector
= r10_bio
->devs
[i
].addr
;
1974 for (j
=0; j
< vcnt
; j
++) {
1975 tbio
->bi_io_vec
[j
].bv_offset
= 0;
1976 tbio
->bi_io_vec
[j
].bv_len
= PAGE_SIZE
;
1978 memcpy(page_address(tbio
->bi_io_vec
[j
].bv_page
),
1979 page_address(fbio
->bi_io_vec
[j
].bv_page
),
1982 tbio
->bi_end_io
= end_sync_write
;
1984 d
= r10_bio
->devs
[i
].devnum
;
1985 atomic_inc(&conf
->mirrors
[d
].rdev
->nr_pending
);
1986 atomic_inc(&r10_bio
->remaining
);
1987 md_sync_acct(conf
->mirrors
[d
].rdev
->bdev
, tbio
->bi_size
>> 9);
1989 tbio
->bi_sector
+= conf
->mirrors
[d
].rdev
->data_offset
;
1990 tbio
->bi_bdev
= conf
->mirrors
[d
].rdev
->bdev
;
1991 generic_make_request(tbio
);
1994 /* Now write out to any replacement devices
1997 for (i
= 0; i
< conf
->copies
; i
++) {
2000 tbio
= r10_bio
->devs
[i
].repl_bio
;
2001 if (!tbio
|| !tbio
->bi_end_io
)
2003 if (r10_bio
->devs
[i
].bio
->bi_end_io
!= end_sync_write
2004 && r10_bio
->devs
[i
].bio
!= fbio
)
2005 for (j
= 0; j
< vcnt
; j
++)
2006 memcpy(page_address(tbio
->bi_io_vec
[j
].bv_page
),
2007 page_address(fbio
->bi_io_vec
[j
].bv_page
),
2009 d
= r10_bio
->devs
[i
].devnum
;
2010 atomic_inc(&r10_bio
->remaining
);
2011 md_sync_acct(conf
->mirrors
[d
].replacement
->bdev
,
2012 tbio
->bi_size
>> 9);
2013 generic_make_request(tbio
);
2017 if (atomic_dec_and_test(&r10_bio
->remaining
)) {
2018 md_done_sync(mddev
, r10_bio
->sectors
, 1);
2024 * Now for the recovery code.
2025 * Recovery happens across physical sectors.
2026 * We recover all non-is_sync drives by finding the virtual address of
2027 * each, and then choose a working drive that also has that virt address.
2028 * There is a separate r10_bio for each non-in_sync drive.
2029 * Only the first two slots are in use. The first for reading,
2030 * The second for writing.
2033 static void fix_recovery_read_error(struct r10bio
*r10_bio
)
2035 /* We got a read error during recovery.
2036 * We repeat the read in smaller page-sized sections.
2037 * If a read succeeds, write it to the new device or record
2038 * a bad block if we cannot.
2039 * If a read fails, record a bad block on both old and
2042 struct mddev
*mddev
= r10_bio
->mddev
;
2043 struct r10conf
*conf
= mddev
->private;
2044 struct bio
*bio
= r10_bio
->devs
[0].bio
;
2046 int sectors
= r10_bio
->sectors
;
2048 int dr
= r10_bio
->devs
[0].devnum
;
2049 int dw
= r10_bio
->devs
[1].devnum
;
2053 struct md_rdev
*rdev
;
2057 if (s
> (PAGE_SIZE
>>9))
2060 rdev
= conf
->mirrors
[dr
].rdev
;
2061 addr
= r10_bio
->devs
[0].addr
+ sect
,
2062 ok
= sync_page_io(rdev
,
2065 bio
->bi_io_vec
[idx
].bv_page
,
2068 rdev
= conf
->mirrors
[dw
].rdev
;
2069 addr
= r10_bio
->devs
[1].addr
+ sect
;
2070 ok
= sync_page_io(rdev
,
2073 bio
->bi_io_vec
[idx
].bv_page
,
2076 set_bit(WriteErrorSeen
, &rdev
->flags
);
2077 if (!test_and_set_bit(WantReplacement
,
2079 set_bit(MD_RECOVERY_NEEDED
,
2080 &rdev
->mddev
->recovery
);
2084 /* We don't worry if we cannot set a bad block -
2085 * it really is bad so there is no loss in not
2088 rdev_set_badblocks(rdev
, addr
, s
, 0);
2090 if (rdev
!= conf
->mirrors
[dw
].rdev
) {
2091 /* need bad block on destination too */
2092 struct md_rdev
*rdev2
= conf
->mirrors
[dw
].rdev
;
2093 addr
= r10_bio
->devs
[1].addr
+ sect
;
2094 ok
= rdev_set_badblocks(rdev2
, addr
, s
, 0);
2096 /* just abort the recovery */
2098 "md/raid10:%s: recovery aborted"
2099 " due to read error\n",
2102 conf
->mirrors
[dw
].recovery_disabled
2103 = mddev
->recovery_disabled
;
2104 set_bit(MD_RECOVERY_INTR
,
2117 static void recovery_request_write(struct mddev
*mddev
, struct r10bio
*r10_bio
)
2119 struct r10conf
*conf
= mddev
->private;
2121 struct bio
*wbio
, *wbio2
;
2123 if (!test_bit(R10BIO_Uptodate
, &r10_bio
->state
)) {
2124 fix_recovery_read_error(r10_bio
);
2125 end_sync_request(r10_bio
);
2130 * share the pages with the first bio
2131 * and submit the write request
2133 d
= r10_bio
->devs
[1].devnum
;
2134 wbio
= r10_bio
->devs
[1].bio
;
2135 wbio2
= r10_bio
->devs
[1].repl_bio
;
2136 if (wbio
->bi_end_io
) {
2137 atomic_inc(&conf
->mirrors
[d
].rdev
->nr_pending
);
2138 md_sync_acct(conf
->mirrors
[d
].rdev
->bdev
, wbio
->bi_size
>> 9);
2139 generic_make_request(wbio
);
2141 if (wbio2
&& wbio2
->bi_end_io
) {
2142 atomic_inc(&conf
->mirrors
[d
].replacement
->nr_pending
);
2143 md_sync_acct(conf
->mirrors
[d
].replacement
->bdev
,
2144 wbio2
->bi_size
>> 9);
2145 generic_make_request(wbio2
);
2151 * Used by fix_read_error() to decay the per rdev read_errors.
2152 * We halve the read error count for every hour that has elapsed
2153 * since the last recorded read error.
2156 static void check_decay_read_errors(struct mddev
*mddev
, struct md_rdev
*rdev
)
2158 struct timespec cur_time_mon
;
2159 unsigned long hours_since_last
;
2160 unsigned int read_errors
= atomic_read(&rdev
->read_errors
);
2162 ktime_get_ts(&cur_time_mon
);
2164 if (rdev
->last_read_error
.tv_sec
== 0 &&
2165 rdev
->last_read_error
.tv_nsec
== 0) {
2166 /* first time we've seen a read error */
2167 rdev
->last_read_error
= cur_time_mon
;
2171 hours_since_last
= (cur_time_mon
.tv_sec
-
2172 rdev
->last_read_error
.tv_sec
) / 3600;
2174 rdev
->last_read_error
= cur_time_mon
;
2177 * if hours_since_last is > the number of bits in read_errors
2178 * just set read errors to 0. We do this to avoid
2179 * overflowing the shift of read_errors by hours_since_last.
2181 if (hours_since_last
>= 8 * sizeof(read_errors
))
2182 atomic_set(&rdev
->read_errors
, 0);
2184 atomic_set(&rdev
->read_errors
, read_errors
>> hours_since_last
);
2187 static int r10_sync_page_io(struct md_rdev
*rdev
, sector_t sector
,
2188 int sectors
, struct page
*page
, int rw
)
2193 if (is_badblock(rdev
, sector
, sectors
, &first_bad
, &bad_sectors
)
2194 && (rw
== READ
|| test_bit(WriteErrorSeen
, &rdev
->flags
)))
2196 if (sync_page_io(rdev
, sector
, sectors
<< 9, page
, rw
, false))
2200 set_bit(WriteErrorSeen
, &rdev
->flags
);
2201 if (!test_and_set_bit(WantReplacement
, &rdev
->flags
))
2202 set_bit(MD_RECOVERY_NEEDED
,
2203 &rdev
->mddev
->recovery
);
2205 /* need to record an error - either for the block or the device */
2206 if (!rdev_set_badblocks(rdev
, sector
, sectors
, 0))
2207 md_error(rdev
->mddev
, rdev
);
2212 * This is a kernel thread which:
2214 * 1. Retries failed read operations on working mirrors.
2215 * 2. Updates the raid superblock when problems encounter.
2216 * 3. Performs writes following reads for array synchronising.
2219 static void fix_read_error(struct r10conf
*conf
, struct mddev
*mddev
, struct r10bio
*r10_bio
)
2221 int sect
= 0; /* Offset from r10_bio->sector */
2222 int sectors
= r10_bio
->sectors
;
2223 struct md_rdev
*rdev
;
2224 int max_read_errors
= atomic_read(&mddev
->max_corr_read_errors
);
2225 int d
= r10_bio
->devs
[r10_bio
->read_slot
].devnum
;
2227 /* still own a reference to this rdev, so it cannot
2228 * have been cleared recently.
2230 rdev
= conf
->mirrors
[d
].rdev
;
2232 if (test_bit(Faulty
, &rdev
->flags
))
2233 /* drive has already been failed, just ignore any
2234 more fix_read_error() attempts */
2237 check_decay_read_errors(mddev
, rdev
);
2238 atomic_inc(&rdev
->read_errors
);
2239 if (atomic_read(&rdev
->read_errors
) > max_read_errors
) {
2240 char b
[BDEVNAME_SIZE
];
2241 bdevname(rdev
->bdev
, b
);
2244 "md/raid10:%s: %s: Raid device exceeded "
2245 "read_error threshold [cur %d:max %d]\n",
2247 atomic_read(&rdev
->read_errors
), max_read_errors
);
2249 "md/raid10:%s: %s: Failing raid device\n",
2251 md_error(mddev
, conf
->mirrors
[d
].rdev
);
2252 r10_bio
->devs
[r10_bio
->read_slot
].bio
= IO_BLOCKED
;
2258 int sl
= r10_bio
->read_slot
;
2262 if (s
> (PAGE_SIZE
>>9))
2270 d
= r10_bio
->devs
[sl
].devnum
;
2271 rdev
= rcu_dereference(conf
->mirrors
[d
].rdev
);
2273 !test_bit(Unmerged
, &rdev
->flags
) &&
2274 test_bit(In_sync
, &rdev
->flags
) &&
2275 is_badblock(rdev
, r10_bio
->devs
[sl
].addr
+ sect
, s
,
2276 &first_bad
, &bad_sectors
) == 0) {
2277 atomic_inc(&rdev
->nr_pending
);
2279 success
= sync_page_io(rdev
,
2280 r10_bio
->devs
[sl
].addr
+
2283 conf
->tmppage
, READ
, false);
2284 rdev_dec_pending(rdev
, mddev
);
2290 if (sl
== conf
->copies
)
2292 } while (!success
&& sl
!= r10_bio
->read_slot
);
2296 /* Cannot read from anywhere, just mark the block
2297 * as bad on the first device to discourage future
2300 int dn
= r10_bio
->devs
[r10_bio
->read_slot
].devnum
;
2301 rdev
= conf
->mirrors
[dn
].rdev
;
2303 if (!rdev_set_badblocks(
2305 r10_bio
->devs
[r10_bio
->read_slot
].addr
2308 md_error(mddev
, rdev
);
2309 r10_bio
->devs
[r10_bio
->read_slot
].bio
2316 /* write it back and re-read */
2318 while (sl
!= r10_bio
->read_slot
) {
2319 char b
[BDEVNAME_SIZE
];
2324 d
= r10_bio
->devs
[sl
].devnum
;
2325 rdev
= rcu_dereference(conf
->mirrors
[d
].rdev
);
2327 test_bit(Unmerged
, &rdev
->flags
) ||
2328 !test_bit(In_sync
, &rdev
->flags
))
2331 atomic_inc(&rdev
->nr_pending
);
2333 if (r10_sync_page_io(rdev
,
2334 r10_bio
->devs
[sl
].addr
+
2336 s
, conf
->tmppage
, WRITE
)
2338 /* Well, this device is dead */
2340 "md/raid10:%s: read correction "
2342 " (%d sectors at %llu on %s)\n",
2344 (unsigned long long)(
2346 choose_data_offset(r10_bio
,
2348 bdevname(rdev
->bdev
, b
));
2349 printk(KERN_NOTICE
"md/raid10:%s: %s: failing "
2352 bdevname(rdev
->bdev
, b
));
2354 rdev_dec_pending(rdev
, mddev
);
2358 while (sl
!= r10_bio
->read_slot
) {
2359 char b
[BDEVNAME_SIZE
];
2364 d
= r10_bio
->devs
[sl
].devnum
;
2365 rdev
= rcu_dereference(conf
->mirrors
[d
].rdev
);
2367 !test_bit(In_sync
, &rdev
->flags
))
2370 atomic_inc(&rdev
->nr_pending
);
2372 switch (r10_sync_page_io(rdev
,
2373 r10_bio
->devs
[sl
].addr
+
2378 /* Well, this device is dead */
2380 "md/raid10:%s: unable to read back "
2382 " (%d sectors at %llu on %s)\n",
2384 (unsigned long long)(
2386 choose_data_offset(r10_bio
, rdev
)),
2387 bdevname(rdev
->bdev
, b
));
2388 printk(KERN_NOTICE
"md/raid10:%s: %s: failing "
2391 bdevname(rdev
->bdev
, b
));
2395 "md/raid10:%s: read error corrected"
2396 " (%d sectors at %llu on %s)\n",
2398 (unsigned long long)(
2400 choose_data_offset(r10_bio
, rdev
)),
2401 bdevname(rdev
->bdev
, b
));
2402 atomic_add(s
, &rdev
->corrected_errors
);
2405 rdev_dec_pending(rdev
, mddev
);
2415 static void bi_complete(struct bio
*bio
, int error
)
2417 complete((struct completion
*)bio
->bi_private
);
2420 static int submit_bio_wait(int rw
, struct bio
*bio
)
2422 struct completion event
;
2425 init_completion(&event
);
2426 bio
->bi_private
= &event
;
2427 bio
->bi_end_io
= bi_complete
;
2428 submit_bio(rw
, bio
);
2429 wait_for_completion(&event
);
2431 return test_bit(BIO_UPTODATE
, &bio
->bi_flags
);
2434 static int narrow_write_error(struct r10bio
*r10_bio
, int i
)
2436 struct bio
*bio
= r10_bio
->master_bio
;
2437 struct mddev
*mddev
= r10_bio
->mddev
;
2438 struct r10conf
*conf
= mddev
->private;
2439 struct md_rdev
*rdev
= conf
->mirrors
[r10_bio
->devs
[i
].devnum
].rdev
;
2440 /* bio has the data to be written to slot 'i' where
2441 * we just recently had a write error.
2442 * We repeatedly clone the bio and trim down to one block,
2443 * then try the write. Where the write fails we record
2445 * It is conceivable that the bio doesn't exactly align with
2446 * blocks. We must handle this.
2448 * We currently own a reference to the rdev.
2454 int sect_to_write
= r10_bio
->sectors
;
2457 if (rdev
->badblocks
.shift
< 0)
2460 block_sectors
= 1 << rdev
->badblocks
.shift
;
2461 sector
= r10_bio
->sector
;
2462 sectors
= ((r10_bio
->sector
+ block_sectors
)
2463 & ~(sector_t
)(block_sectors
- 1))
2466 while (sect_to_write
) {
2468 if (sectors
> sect_to_write
)
2469 sectors
= sect_to_write
;
2470 /* Write at 'sector' for 'sectors' */
2471 wbio
= bio_clone_mddev(bio
, GFP_NOIO
, mddev
);
2472 md_trim_bio(wbio
, sector
- bio
->bi_sector
, sectors
);
2473 wbio
->bi_sector
= (r10_bio
->devs
[i
].addr
+
2474 choose_data_offset(r10_bio
, rdev
) +
2475 (sector
- r10_bio
->sector
));
2476 wbio
->bi_bdev
= rdev
->bdev
;
2477 if (submit_bio_wait(WRITE
, wbio
) == 0)
2479 ok
= rdev_set_badblocks(rdev
, sector
,
2484 sect_to_write
-= sectors
;
2486 sectors
= block_sectors
;
2491 static void handle_read_error(struct mddev
*mddev
, struct r10bio
*r10_bio
)
2493 int slot
= r10_bio
->read_slot
;
2495 struct r10conf
*conf
= mddev
->private;
2496 struct md_rdev
*rdev
= r10_bio
->devs
[slot
].rdev
;
2497 char b
[BDEVNAME_SIZE
];
2498 unsigned long do_sync
;
2501 /* we got a read error. Maybe the drive is bad. Maybe just
2502 * the block and we can fix it.
2503 * We freeze all other IO, and try reading the block from
2504 * other devices. When we find one, we re-write
2505 * and check it that fixes the read error.
2506 * This is all done synchronously while the array is
2509 bio
= r10_bio
->devs
[slot
].bio
;
2510 bdevname(bio
->bi_bdev
, b
);
2512 r10_bio
->devs
[slot
].bio
= NULL
;
2514 if (mddev
->ro
== 0) {
2516 fix_read_error(conf
, mddev
, r10_bio
);
2517 unfreeze_array(conf
);
2519 r10_bio
->devs
[slot
].bio
= IO_BLOCKED
;
2521 rdev_dec_pending(rdev
, mddev
);
2524 rdev
= read_balance(conf
, r10_bio
, &max_sectors
);
2526 printk(KERN_ALERT
"md/raid10:%s: %s: unrecoverable I/O"
2527 " read error for block %llu\n",
2529 (unsigned long long)r10_bio
->sector
);
2530 raid_end_bio_io(r10_bio
);
2534 do_sync
= (r10_bio
->master_bio
->bi_rw
& REQ_SYNC
);
2535 slot
= r10_bio
->read_slot
;
2538 "md/raid10:%s: %s: redirecting "
2539 "sector %llu to another mirror\n",
2541 bdevname(rdev
->bdev
, b
),
2542 (unsigned long long)r10_bio
->sector
);
2543 bio
= bio_clone_mddev(r10_bio
->master_bio
,
2546 r10_bio
->sector
- bio
->bi_sector
,
2548 r10_bio
->devs
[slot
].bio
= bio
;
2549 r10_bio
->devs
[slot
].rdev
= rdev
;
2550 bio
->bi_sector
= r10_bio
->devs
[slot
].addr
2551 + choose_data_offset(r10_bio
, rdev
);
2552 bio
->bi_bdev
= rdev
->bdev
;
2553 bio
->bi_rw
= READ
| do_sync
;
2554 bio
->bi_private
= r10_bio
;
2555 bio
->bi_end_io
= raid10_end_read_request
;
2556 if (max_sectors
< r10_bio
->sectors
) {
2557 /* Drat - have to split this up more */
2558 struct bio
*mbio
= r10_bio
->master_bio
;
2559 int sectors_handled
=
2560 r10_bio
->sector
+ max_sectors
2562 r10_bio
->sectors
= max_sectors
;
2563 spin_lock_irq(&conf
->device_lock
);
2564 if (mbio
->bi_phys_segments
== 0)
2565 mbio
->bi_phys_segments
= 2;
2567 mbio
->bi_phys_segments
++;
2568 spin_unlock_irq(&conf
->device_lock
);
2569 generic_make_request(bio
);
2571 r10_bio
= mempool_alloc(conf
->r10bio_pool
,
2573 r10_bio
->master_bio
= mbio
;
2574 r10_bio
->sectors
= (mbio
->bi_size
>> 9)
2577 set_bit(R10BIO_ReadError
,
2579 r10_bio
->mddev
= mddev
;
2580 r10_bio
->sector
= mbio
->bi_sector
2585 generic_make_request(bio
);
2588 static void handle_write_completed(struct r10conf
*conf
, struct r10bio
*r10_bio
)
2590 /* Some sort of write request has finished and it
2591 * succeeded in writing where we thought there was a
2592 * bad block. So forget the bad block.
2593 * Or possibly if failed and we need to record
2597 struct md_rdev
*rdev
;
2599 if (test_bit(R10BIO_IsSync
, &r10_bio
->state
) ||
2600 test_bit(R10BIO_IsRecover
, &r10_bio
->state
)) {
2601 for (m
= 0; m
< conf
->copies
; m
++) {
2602 int dev
= r10_bio
->devs
[m
].devnum
;
2603 rdev
= conf
->mirrors
[dev
].rdev
;
2604 if (r10_bio
->devs
[m
].bio
== NULL
)
2606 if (test_bit(BIO_UPTODATE
,
2607 &r10_bio
->devs
[m
].bio
->bi_flags
)) {
2608 rdev_clear_badblocks(
2610 r10_bio
->devs
[m
].addr
,
2611 r10_bio
->sectors
, 0);
2613 if (!rdev_set_badblocks(
2615 r10_bio
->devs
[m
].addr
,
2616 r10_bio
->sectors
, 0))
2617 md_error(conf
->mddev
, rdev
);
2619 rdev
= conf
->mirrors
[dev
].replacement
;
2620 if (r10_bio
->devs
[m
].repl_bio
== NULL
)
2622 if (test_bit(BIO_UPTODATE
,
2623 &r10_bio
->devs
[m
].repl_bio
->bi_flags
)) {
2624 rdev_clear_badblocks(
2626 r10_bio
->devs
[m
].addr
,
2627 r10_bio
->sectors
, 0);
2629 if (!rdev_set_badblocks(
2631 r10_bio
->devs
[m
].addr
,
2632 r10_bio
->sectors
, 0))
2633 md_error(conf
->mddev
, rdev
);
2638 for (m
= 0; m
< conf
->copies
; m
++) {
2639 int dev
= r10_bio
->devs
[m
].devnum
;
2640 struct bio
*bio
= r10_bio
->devs
[m
].bio
;
2641 rdev
= conf
->mirrors
[dev
].rdev
;
2642 if (bio
== IO_MADE_GOOD
) {
2643 rdev_clear_badblocks(
2645 r10_bio
->devs
[m
].addr
,
2646 r10_bio
->sectors
, 0);
2647 rdev_dec_pending(rdev
, conf
->mddev
);
2648 } else if (bio
!= NULL
&&
2649 !test_bit(BIO_UPTODATE
, &bio
->bi_flags
)) {
2650 if (!narrow_write_error(r10_bio
, m
)) {
2651 md_error(conf
->mddev
, rdev
);
2652 set_bit(R10BIO_Degraded
,
2655 rdev_dec_pending(rdev
, conf
->mddev
);
2657 bio
= r10_bio
->devs
[m
].repl_bio
;
2658 rdev
= conf
->mirrors
[dev
].replacement
;
2659 if (rdev
&& bio
== IO_MADE_GOOD
) {
2660 rdev_clear_badblocks(
2662 r10_bio
->devs
[m
].addr
,
2663 r10_bio
->sectors
, 0);
2664 rdev_dec_pending(rdev
, conf
->mddev
);
2667 if (test_bit(R10BIO_WriteError
,
2669 close_write(r10_bio
);
2670 raid_end_bio_io(r10_bio
);
2674 static void raid10d(struct mddev
*mddev
)
2676 struct r10bio
*r10_bio
;
2677 unsigned long flags
;
2678 struct r10conf
*conf
= mddev
->private;
2679 struct list_head
*head
= &conf
->retry_list
;
2680 struct blk_plug plug
;
2682 md_check_recovery(mddev
);
2684 blk_start_plug(&plug
);
2687 flush_pending_writes(conf
);
2689 spin_lock_irqsave(&conf
->device_lock
, flags
);
2690 if (list_empty(head
)) {
2691 spin_unlock_irqrestore(&conf
->device_lock
, flags
);
2694 r10_bio
= list_entry(head
->prev
, struct r10bio
, retry_list
);
2695 list_del(head
->prev
);
2697 spin_unlock_irqrestore(&conf
->device_lock
, flags
);
2699 mddev
= r10_bio
->mddev
;
2700 conf
= mddev
->private;
2701 if (test_bit(R10BIO_MadeGood
, &r10_bio
->state
) ||
2702 test_bit(R10BIO_WriteError
, &r10_bio
->state
))
2703 handle_write_completed(conf
, r10_bio
);
2704 else if (test_bit(R10BIO_IsReshape
, &r10_bio
->state
))
2705 reshape_request_write(mddev
, r10_bio
);
2706 else if (test_bit(R10BIO_IsSync
, &r10_bio
->state
))
2707 sync_request_write(mddev
, r10_bio
);
2708 else if (test_bit(R10BIO_IsRecover
, &r10_bio
->state
))
2709 recovery_request_write(mddev
, r10_bio
);
2710 else if (test_bit(R10BIO_ReadError
, &r10_bio
->state
))
2711 handle_read_error(mddev
, r10_bio
);
2713 /* just a partial read to be scheduled from a
2716 int slot
= r10_bio
->read_slot
;
2717 generic_make_request(r10_bio
->devs
[slot
].bio
);
2721 if (mddev
->flags
& ~(1<<MD_CHANGE_PENDING
))
2722 md_check_recovery(mddev
);
2724 blk_finish_plug(&plug
);
2728 static int init_resync(struct r10conf
*conf
)
2733 buffs
= RESYNC_WINDOW
/ RESYNC_BLOCK_SIZE
;
2734 BUG_ON(conf
->r10buf_pool
);
2735 conf
->have_replacement
= 0;
2736 for (i
= 0; i
< conf
->geo
.raid_disks
; i
++)
2737 if (conf
->mirrors
[i
].replacement
)
2738 conf
->have_replacement
= 1;
2739 conf
->r10buf_pool
= mempool_create(buffs
, r10buf_pool_alloc
, r10buf_pool_free
, conf
);
2740 if (!conf
->r10buf_pool
)
2742 conf
->next_resync
= 0;
2747 * perform a "sync" on one "block"
2749 * We need to make sure that no normal I/O request - particularly write
2750 * requests - conflict with active sync requests.
2752 * This is achieved by tracking pending requests and a 'barrier' concept
2753 * that can be installed to exclude normal IO requests.
2755 * Resync and recovery are handled very differently.
2756 * We differentiate by looking at MD_RECOVERY_SYNC in mddev->recovery.
2758 * For resync, we iterate over virtual addresses, read all copies,
2759 * and update if there are differences. If only one copy is live,
2761 * For recovery, we iterate over physical addresses, read a good
2762 * value for each non-in_sync drive, and over-write.
2764 * So, for recovery we may have several outstanding complex requests for a
2765 * given address, one for each out-of-sync device. We model this by allocating
2766 * a number of r10_bio structures, one for each out-of-sync device.
2767 * As we setup these structures, we collect all bio's together into a list
2768 * which we then process collectively to add pages, and then process again
2769 * to pass to generic_make_request.
2771 * The r10_bio structures are linked using a borrowed master_bio pointer.
2772 * This link is counted in ->remaining. When the r10_bio that points to NULL
2773 * has its remaining count decremented to 0, the whole complex operation
2778 static sector_t
sync_request(struct mddev
*mddev
, sector_t sector_nr
,
2779 int *skipped
, int go_faster
)
2781 struct r10conf
*conf
= mddev
->private;
2782 struct r10bio
*r10_bio
;
2783 struct bio
*biolist
= NULL
, *bio
;
2784 sector_t max_sector
, nr_sectors
;
2787 sector_t sync_blocks
;
2788 sector_t sectors_skipped
= 0;
2789 int chunks_skipped
= 0;
2790 sector_t chunk_mask
= conf
->geo
.chunk_mask
;
2792 if (!conf
->r10buf_pool
)
2793 if (init_resync(conf
))
2797 max_sector
= mddev
->dev_sectors
;
2798 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
2799 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
2800 max_sector
= mddev
->resync_max_sectors
;
2801 if (sector_nr
>= max_sector
) {
2802 /* If we aborted, we need to abort the
2803 * sync on the 'current' bitmap chucks (there can
2804 * be several when recovering multiple devices).
2805 * as we may have started syncing it but not finished.
2806 * We can find the current address in
2807 * mddev->curr_resync, but for recovery,
2808 * we need to convert that to several
2809 * virtual addresses.
2811 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)) {
2816 if (mddev
->curr_resync
< max_sector
) { /* aborted */
2817 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
2818 bitmap_end_sync(mddev
->bitmap
, mddev
->curr_resync
,
2820 else for (i
= 0; i
< conf
->geo
.raid_disks
; i
++) {
2822 raid10_find_virt(conf
, mddev
->curr_resync
, i
);
2823 bitmap_end_sync(mddev
->bitmap
, sect
,
2827 /* completed sync */
2828 if ((!mddev
->bitmap
|| conf
->fullsync
)
2829 && conf
->have_replacement
2830 && test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
2831 /* Completed a full sync so the replacements
2832 * are now fully recovered.
2834 for (i
= 0; i
< conf
->geo
.raid_disks
; i
++)
2835 if (conf
->mirrors
[i
].replacement
)
2836 conf
->mirrors
[i
].replacement
2842 bitmap_close_sync(mddev
->bitmap
);
2845 return sectors_skipped
;
2848 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
2849 return reshape_request(mddev
, sector_nr
, skipped
);
2851 if (chunks_skipped
>= conf
->geo
.raid_disks
) {
2852 /* if there has been nothing to do on any drive,
2853 * then there is nothing to do at all..
2856 return (max_sector
- sector_nr
) + sectors_skipped
;
2859 if (max_sector
> mddev
->resync_max
)
2860 max_sector
= mddev
->resync_max
; /* Don't do IO beyond here */
2862 /* make sure whole request will fit in a chunk - if chunks
2865 if (conf
->geo
.near_copies
< conf
->geo
.raid_disks
&&
2866 max_sector
> (sector_nr
| chunk_mask
))
2867 max_sector
= (sector_nr
| chunk_mask
) + 1;
2869 * If there is non-resync activity waiting for us then
2870 * put in a delay to throttle resync.
2872 if (!go_faster
&& conf
->nr_waiting
)
2873 msleep_interruptible(1000);
2875 /* Again, very different code for resync and recovery.
2876 * Both must result in an r10bio with a list of bios that
2877 * have bi_end_io, bi_sector, bi_bdev set,
2878 * and bi_private set to the r10bio.
2879 * For recovery, we may actually create several r10bios
2880 * with 2 bios in each, that correspond to the bios in the main one.
2881 * In this case, the subordinate r10bios link back through a
2882 * borrowed master_bio pointer, and the counter in the master
2883 * includes a ref from each subordinate.
2885 /* First, we decide what to do and set ->bi_end_io
2886 * To end_sync_read if we want to read, and
2887 * end_sync_write if we will want to write.
2890 max_sync
= RESYNC_PAGES
<< (PAGE_SHIFT
-9);
2891 if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
2892 /* recovery... the complicated one */
2896 for (i
= 0 ; i
< conf
->geo
.raid_disks
; i
++) {
2902 struct raid10_info
*mirror
= &conf
->mirrors
[i
];
2904 if ((mirror
->rdev
== NULL
||
2905 test_bit(In_sync
, &mirror
->rdev
->flags
))
2907 (mirror
->replacement
== NULL
||
2909 &mirror
->replacement
->flags
)))
2913 /* want to reconstruct this device */
2915 sect
= raid10_find_virt(conf
, sector_nr
, i
);
2916 if (sect
>= mddev
->resync_max_sectors
) {
2917 /* last stripe is not complete - don't
2918 * try to recover this sector.
2922 /* Unless we are doing a full sync, or a replacement
2923 * we only need to recover the block if it is set in
2926 must_sync
= bitmap_start_sync(mddev
->bitmap
, sect
,
2928 if (sync_blocks
< max_sync
)
2929 max_sync
= sync_blocks
;
2931 mirror
->replacement
== NULL
&&
2933 /* yep, skip the sync_blocks here, but don't assume
2934 * that there will never be anything to do here
2936 chunks_skipped
= -1;
2940 r10_bio
= mempool_alloc(conf
->r10buf_pool
, GFP_NOIO
);
2941 raise_barrier(conf
, rb2
!= NULL
);
2942 atomic_set(&r10_bio
->remaining
, 0);
2944 r10_bio
->master_bio
= (struct bio
*)rb2
;
2946 atomic_inc(&rb2
->remaining
);
2947 r10_bio
->mddev
= mddev
;
2948 set_bit(R10BIO_IsRecover
, &r10_bio
->state
);
2949 r10_bio
->sector
= sect
;
2951 raid10_find_phys(conf
, r10_bio
);
2953 /* Need to check if the array will still be
2956 for (j
= 0; j
< conf
->geo
.raid_disks
; j
++)
2957 if (conf
->mirrors
[j
].rdev
== NULL
||
2958 test_bit(Faulty
, &conf
->mirrors
[j
].rdev
->flags
)) {
2963 must_sync
= bitmap_start_sync(mddev
->bitmap
, sect
,
2964 &sync_blocks
, still_degraded
);
2967 for (j
=0; j
<conf
->copies
;j
++) {
2969 int d
= r10_bio
->devs
[j
].devnum
;
2970 sector_t from_addr
, to_addr
;
2971 struct md_rdev
*rdev
;
2972 sector_t sector
, first_bad
;
2974 if (!conf
->mirrors
[d
].rdev
||
2975 !test_bit(In_sync
, &conf
->mirrors
[d
].rdev
->flags
))
2977 /* This is where we read from */
2979 rdev
= conf
->mirrors
[d
].rdev
;
2980 sector
= r10_bio
->devs
[j
].addr
;
2982 if (is_badblock(rdev
, sector
, max_sync
,
2983 &first_bad
, &bad_sectors
)) {
2984 if (first_bad
> sector
)
2985 max_sync
= first_bad
- sector
;
2987 bad_sectors
-= (sector
2989 if (max_sync
> bad_sectors
)
2990 max_sync
= bad_sectors
;
2994 bio
= r10_bio
->devs
[0].bio
;
2995 bio
->bi_next
= biolist
;
2997 bio
->bi_private
= r10_bio
;
2998 bio
->bi_end_io
= end_sync_read
;
3000 from_addr
= r10_bio
->devs
[j
].addr
;
3001 bio
->bi_sector
= from_addr
+ rdev
->data_offset
;
3002 bio
->bi_bdev
= rdev
->bdev
;
3003 atomic_inc(&rdev
->nr_pending
);
3004 /* and we write to 'i' (if not in_sync) */
3006 for (k
=0; k
<conf
->copies
; k
++)
3007 if (r10_bio
->devs
[k
].devnum
== i
)
3009 BUG_ON(k
== conf
->copies
);
3010 to_addr
= r10_bio
->devs
[k
].addr
;
3011 r10_bio
->devs
[0].devnum
= d
;
3012 r10_bio
->devs
[0].addr
= from_addr
;
3013 r10_bio
->devs
[1].devnum
= i
;
3014 r10_bio
->devs
[1].addr
= to_addr
;
3016 rdev
= mirror
->rdev
;
3017 if (!test_bit(In_sync
, &rdev
->flags
)) {
3018 bio
= r10_bio
->devs
[1].bio
;
3019 bio
->bi_next
= biolist
;
3021 bio
->bi_private
= r10_bio
;
3022 bio
->bi_end_io
= end_sync_write
;
3024 bio
->bi_sector
= to_addr
3025 + rdev
->data_offset
;
3026 bio
->bi_bdev
= rdev
->bdev
;
3027 atomic_inc(&r10_bio
->remaining
);
3029 r10_bio
->devs
[1].bio
->bi_end_io
= NULL
;
3031 /* and maybe write to replacement */
3032 bio
= r10_bio
->devs
[1].repl_bio
;
3034 bio
->bi_end_io
= NULL
;
3035 rdev
= mirror
->replacement
;
3036 /* Note: if rdev != NULL, then bio
3037 * cannot be NULL as r10buf_pool_alloc will
3038 * have allocated it.
3039 * So the second test here is pointless.
3040 * But it keeps semantic-checkers happy, and
3041 * this comment keeps human reviewers
3044 if (rdev
== NULL
|| bio
== NULL
||
3045 test_bit(Faulty
, &rdev
->flags
))
3047 bio
->bi_next
= biolist
;
3049 bio
->bi_private
= r10_bio
;
3050 bio
->bi_end_io
= end_sync_write
;
3052 bio
->bi_sector
= to_addr
+ rdev
->data_offset
;
3053 bio
->bi_bdev
= rdev
->bdev
;
3054 atomic_inc(&r10_bio
->remaining
);
3057 if (j
== conf
->copies
) {
3058 /* Cannot recover, so abort the recovery or
3059 * record a bad block */
3062 atomic_dec(&rb2
->remaining
);
3065 /* problem is that there are bad blocks
3066 * on other device(s)
3069 for (k
= 0; k
< conf
->copies
; k
++)
3070 if (r10_bio
->devs
[k
].devnum
== i
)
3072 if (!test_bit(In_sync
,
3073 &mirror
->rdev
->flags
)
3074 && !rdev_set_badblocks(
3076 r10_bio
->devs
[k
].addr
,
3079 if (mirror
->replacement
&&
3080 !rdev_set_badblocks(
3081 mirror
->replacement
,
3082 r10_bio
->devs
[k
].addr
,
3087 if (!test_and_set_bit(MD_RECOVERY_INTR
,
3089 printk(KERN_INFO
"md/raid10:%s: insufficient "
3090 "working devices for recovery.\n",
3092 mirror
->recovery_disabled
3093 = mddev
->recovery_disabled
;
3098 if (biolist
== NULL
) {
3100 struct r10bio
*rb2
= r10_bio
;
3101 r10_bio
= (struct r10bio
*) rb2
->master_bio
;
3102 rb2
->master_bio
= NULL
;
3108 /* resync. Schedule a read for every block at this virt offset */
3111 bitmap_cond_end_sync(mddev
->bitmap
, sector_nr
);
3113 if (!bitmap_start_sync(mddev
->bitmap
, sector_nr
,
3114 &sync_blocks
, mddev
->degraded
) &&
3115 !conf
->fullsync
&& !test_bit(MD_RECOVERY_REQUESTED
,
3116 &mddev
->recovery
)) {
3117 /* We can skip this block */
3119 return sync_blocks
+ sectors_skipped
;
3121 if (sync_blocks
< max_sync
)
3122 max_sync
= sync_blocks
;
3123 r10_bio
= mempool_alloc(conf
->r10buf_pool
, GFP_NOIO
);
3125 r10_bio
->mddev
= mddev
;
3126 atomic_set(&r10_bio
->remaining
, 0);
3127 raise_barrier(conf
, 0);
3128 conf
->next_resync
= sector_nr
;
3130 r10_bio
->master_bio
= NULL
;
3131 r10_bio
->sector
= sector_nr
;
3132 set_bit(R10BIO_IsSync
, &r10_bio
->state
);
3133 raid10_find_phys(conf
, r10_bio
);
3134 r10_bio
->sectors
= (sector_nr
| chunk_mask
) - sector_nr
+ 1;
3136 for (i
= 0; i
< conf
->copies
; i
++) {
3137 int d
= r10_bio
->devs
[i
].devnum
;
3138 sector_t first_bad
, sector
;
3141 if (r10_bio
->devs
[i
].repl_bio
)
3142 r10_bio
->devs
[i
].repl_bio
->bi_end_io
= NULL
;
3144 bio
= r10_bio
->devs
[i
].bio
;
3145 bio
->bi_end_io
= NULL
;
3146 clear_bit(BIO_UPTODATE
, &bio
->bi_flags
);
3147 if (conf
->mirrors
[d
].rdev
== NULL
||
3148 test_bit(Faulty
, &conf
->mirrors
[d
].rdev
->flags
))
3150 sector
= r10_bio
->devs
[i
].addr
;
3151 if (is_badblock(conf
->mirrors
[d
].rdev
,
3153 &first_bad
, &bad_sectors
)) {
3154 if (first_bad
> sector
)
3155 max_sync
= first_bad
- sector
;
3157 bad_sectors
-= (sector
- first_bad
);
3158 if (max_sync
> bad_sectors
)
3159 max_sync
= max_sync
;
3163 atomic_inc(&conf
->mirrors
[d
].rdev
->nr_pending
);
3164 atomic_inc(&r10_bio
->remaining
);
3165 bio
->bi_next
= biolist
;
3167 bio
->bi_private
= r10_bio
;
3168 bio
->bi_end_io
= end_sync_read
;
3170 bio
->bi_sector
= sector
+
3171 conf
->mirrors
[d
].rdev
->data_offset
;
3172 bio
->bi_bdev
= conf
->mirrors
[d
].rdev
->bdev
;
3175 if (conf
->mirrors
[d
].replacement
== NULL
||
3177 &conf
->mirrors
[d
].replacement
->flags
))
3180 /* Need to set up for writing to the replacement */
3181 bio
= r10_bio
->devs
[i
].repl_bio
;
3182 clear_bit(BIO_UPTODATE
, &bio
->bi_flags
);
3184 sector
= r10_bio
->devs
[i
].addr
;
3185 atomic_inc(&conf
->mirrors
[d
].rdev
->nr_pending
);
3186 bio
->bi_next
= biolist
;
3188 bio
->bi_private
= r10_bio
;
3189 bio
->bi_end_io
= end_sync_write
;
3191 bio
->bi_sector
= sector
+
3192 conf
->mirrors
[d
].replacement
->data_offset
;
3193 bio
->bi_bdev
= conf
->mirrors
[d
].replacement
->bdev
;
3198 for (i
=0; i
<conf
->copies
; i
++) {
3199 int d
= r10_bio
->devs
[i
].devnum
;
3200 if (r10_bio
->devs
[i
].bio
->bi_end_io
)
3201 rdev_dec_pending(conf
->mirrors
[d
].rdev
,
3203 if (r10_bio
->devs
[i
].repl_bio
&&
3204 r10_bio
->devs
[i
].repl_bio
->bi_end_io
)
3206 conf
->mirrors
[d
].replacement
,
3215 for (bio
= biolist
; bio
; bio
=bio
->bi_next
) {
3217 bio
->bi_flags
&= ~(BIO_POOL_MASK
- 1);
3219 bio
->bi_flags
|= 1 << BIO_UPTODATE
;
3222 bio
->bi_phys_segments
= 0;
3227 if (sector_nr
+ max_sync
< max_sector
)
3228 max_sector
= sector_nr
+ max_sync
;
3231 int len
= PAGE_SIZE
;
3232 if (sector_nr
+ (len
>>9) > max_sector
)
3233 len
= (max_sector
- sector_nr
) << 9;
3236 for (bio
= biolist
; bio
; bio
=bio
->bi_next
) {
3238 page
= bio
->bi_io_vec
[bio
->bi_vcnt
].bv_page
;
3239 if (bio_add_page(bio
, page
, len
, 0))
3243 bio
->bi_io_vec
[bio
->bi_vcnt
].bv_page
= page
;
3244 for (bio2
= biolist
;
3245 bio2
&& bio2
!= bio
;
3246 bio2
= bio2
->bi_next
) {
3247 /* remove last page from this bio */
3249 bio2
->bi_size
-= len
;
3250 bio2
->bi_flags
&= ~(1<< BIO_SEG_VALID
);
3254 nr_sectors
+= len
>>9;
3255 sector_nr
+= len
>>9;
3256 } while (biolist
->bi_vcnt
< RESYNC_PAGES
);
3258 r10_bio
->sectors
= nr_sectors
;
3262 biolist
= biolist
->bi_next
;
3264 bio
->bi_next
= NULL
;
3265 r10_bio
= bio
->bi_private
;
3266 r10_bio
->sectors
= nr_sectors
;
3268 if (bio
->bi_end_io
== end_sync_read
) {
3269 md_sync_acct(bio
->bi_bdev
, nr_sectors
);
3270 generic_make_request(bio
);
3274 if (sectors_skipped
)
3275 /* pretend they weren't skipped, it makes
3276 * no important difference in this case
3278 md_done_sync(mddev
, sectors_skipped
, 1);
3280 return sectors_skipped
+ nr_sectors
;
3282 /* There is nowhere to write, so all non-sync
3283 * drives must be failed or in resync, all drives
3284 * have a bad block, so try the next chunk...
3286 if (sector_nr
+ max_sync
< max_sector
)
3287 max_sector
= sector_nr
+ max_sync
;
3289 sectors_skipped
+= (max_sector
- sector_nr
);
3291 sector_nr
= max_sector
;
3296 raid10_size(struct mddev
*mddev
, sector_t sectors
, int raid_disks
)
3299 struct r10conf
*conf
= mddev
->private;
3302 raid_disks
= min(conf
->geo
.raid_disks
,
3303 conf
->prev
.raid_disks
);
3305 sectors
= conf
->dev_sectors
;
3307 size
= sectors
>> conf
->geo
.chunk_shift
;
3308 sector_div(size
, conf
->geo
.far_copies
);
3309 size
= size
* raid_disks
;
3310 sector_div(size
, conf
->geo
.near_copies
);
3312 return size
<< conf
->geo
.chunk_shift
;
3315 static void calc_sectors(struct r10conf
*conf
, sector_t size
)
3317 /* Calculate the number of sectors-per-device that will
3318 * actually be used, and set conf->dev_sectors and
3322 size
= size
>> conf
->geo
.chunk_shift
;
3323 sector_div(size
, conf
->geo
.far_copies
);
3324 size
= size
* conf
->geo
.raid_disks
;
3325 sector_div(size
, conf
->geo
.near_copies
);
3326 /* 'size' is now the number of chunks in the array */
3327 /* calculate "used chunks per device" */
3328 size
= size
* conf
->copies
;
3330 /* We need to round up when dividing by raid_disks to
3331 * get the stride size.
3333 size
= DIV_ROUND_UP_SECTOR_T(size
, conf
->geo
.raid_disks
);
3335 conf
->dev_sectors
= size
<< conf
->geo
.chunk_shift
;
3337 if (conf
->geo
.far_offset
)
3338 conf
->geo
.stride
= 1 << conf
->geo
.chunk_shift
;
3340 sector_div(size
, conf
->geo
.far_copies
);
3341 conf
->geo
.stride
= size
<< conf
->geo
.chunk_shift
;
3345 enum geo_type
{geo_new
, geo_old
, geo_start
};
3346 static int setup_geo(struct geom
*geo
, struct mddev
*mddev
, enum geo_type
new)
3349 int layout
, chunk
, disks
;
3352 layout
= mddev
->layout
;
3353 chunk
= mddev
->chunk_sectors
;
3354 disks
= mddev
->raid_disks
- mddev
->delta_disks
;
3357 layout
= mddev
->new_layout
;
3358 chunk
= mddev
->new_chunk_sectors
;
3359 disks
= mddev
->raid_disks
;
3361 default: /* avoid 'may be unused' warnings */
3362 case geo_start
: /* new when starting reshape - raid_disks not
3364 layout
= mddev
->new_layout
;
3365 chunk
= mddev
->new_chunk_sectors
;
3366 disks
= mddev
->raid_disks
+ mddev
->delta_disks
;
3371 if (chunk
< (PAGE_SIZE
>> 9) ||
3372 !is_power_of_2(chunk
))
3375 fc
= (layout
>> 8) & 255;
3376 fo
= layout
& (1<<16);
3377 geo
->raid_disks
= disks
;
3378 geo
->near_copies
= nc
;
3379 geo
->far_copies
= fc
;
3380 geo
->far_offset
= fo
;
3381 geo
->chunk_mask
= chunk
- 1;
3382 geo
->chunk_shift
= ffz(~chunk
);
3386 static struct r10conf
*setup_conf(struct mddev
*mddev
)
3388 struct r10conf
*conf
= NULL
;
3393 copies
= setup_geo(&geo
, mddev
, geo_new
);
3396 printk(KERN_ERR
"md/raid10:%s: chunk size must be "
3397 "at least PAGE_SIZE(%ld) and be a power of 2.\n",
3398 mdname(mddev
), PAGE_SIZE
);
3402 if (copies
< 2 || copies
> mddev
->raid_disks
) {
3403 printk(KERN_ERR
"md/raid10:%s: unsupported raid10 layout: 0x%8x\n",
3404 mdname(mddev
), mddev
->new_layout
);
3409 conf
= kzalloc(sizeof(struct r10conf
), GFP_KERNEL
);
3413 /* FIXME calc properly */
3414 conf
->mirrors
= kzalloc(sizeof(struct raid10_info
)*(mddev
->raid_disks
+
3415 max(0,mddev
->delta_disks
)),
3420 conf
->tmppage
= alloc_page(GFP_KERNEL
);
3425 conf
->copies
= copies
;
3426 conf
->r10bio_pool
= mempool_create(NR_RAID10_BIOS
, r10bio_pool_alloc
,
3427 r10bio_pool_free
, conf
);
3428 if (!conf
->r10bio_pool
)
3431 calc_sectors(conf
, mddev
->dev_sectors
);
3432 if (mddev
->reshape_position
== MaxSector
) {
3433 conf
->prev
= conf
->geo
;
3434 conf
->reshape_progress
= MaxSector
;
3436 if (setup_geo(&conf
->prev
, mddev
, geo_old
) != conf
->copies
) {
3440 conf
->reshape_progress
= mddev
->reshape_position
;
3441 if (conf
->prev
.far_offset
)
3442 conf
->prev
.stride
= 1 << conf
->prev
.chunk_shift
;
3444 /* far_copies must be 1 */
3445 conf
->prev
.stride
= conf
->dev_sectors
;
3447 spin_lock_init(&conf
->device_lock
);
3448 INIT_LIST_HEAD(&conf
->retry_list
);
3450 spin_lock_init(&conf
->resync_lock
);
3451 init_waitqueue_head(&conf
->wait_barrier
);
3453 conf
->thread
= md_register_thread(raid10d
, mddev
, "raid10");
3457 conf
->mddev
= mddev
;
3462 printk(KERN_ERR
"md/raid10:%s: couldn't allocate memory.\n",
3465 if (conf
->r10bio_pool
)
3466 mempool_destroy(conf
->r10bio_pool
);
3467 kfree(conf
->mirrors
);
3468 safe_put_page(conf
->tmppage
);
3471 return ERR_PTR(err
);
3474 static int run(struct mddev
*mddev
)
3476 struct r10conf
*conf
;
3477 int i
, disk_idx
, chunk_size
;
3478 struct raid10_info
*disk
;
3479 struct md_rdev
*rdev
;
3481 sector_t min_offset_diff
= 0;
3484 if (mddev
->private == NULL
) {
3485 conf
= setup_conf(mddev
);
3487 return PTR_ERR(conf
);
3488 mddev
->private = conf
;
3490 conf
= mddev
->private;
3494 mddev
->thread
= conf
->thread
;
3495 conf
->thread
= NULL
;
3497 chunk_size
= mddev
->chunk_sectors
<< 9;
3499 blk_queue_io_min(mddev
->queue
, chunk_size
);
3500 if (conf
->geo
.raid_disks
% conf
->geo
.near_copies
)
3501 blk_queue_io_opt(mddev
->queue
, chunk_size
* conf
->geo
.raid_disks
);
3503 blk_queue_io_opt(mddev
->queue
, chunk_size
*
3504 (conf
->geo
.raid_disks
/ conf
->geo
.near_copies
));
3507 rdev_for_each(rdev
, mddev
) {
3509 struct request_queue
*q
;
3511 disk_idx
= rdev
->raid_disk
;
3514 if (disk_idx
>= conf
->geo
.raid_disks
&&
3515 disk_idx
>= conf
->prev
.raid_disks
)
3517 disk
= conf
->mirrors
+ disk_idx
;
3519 if (test_bit(Replacement
, &rdev
->flags
)) {
3520 if (disk
->replacement
)
3522 disk
->replacement
= rdev
;
3528 q
= bdev_get_queue(rdev
->bdev
);
3529 if (q
->merge_bvec_fn
)
3530 mddev
->merge_check_needed
= 1;
3531 diff
= (rdev
->new_data_offset
- rdev
->data_offset
);
3532 if (!mddev
->reshape_backwards
)
3536 if (first
|| diff
< min_offset_diff
)
3537 min_offset_diff
= diff
;
3540 disk_stack_limits(mddev
->gendisk
, rdev
->bdev
,
3541 rdev
->data_offset
<< 9);
3543 disk
->head_position
= 0;
3546 /* need to check that every block has at least one working mirror */
3547 if (!enough(conf
, -1)) {
3548 printk(KERN_ERR
"md/raid10:%s: not enough operational mirrors.\n",
3553 if (conf
->reshape_progress
!= MaxSector
) {
3554 /* must ensure that shape change is supported */
3555 if (conf
->geo
.far_copies
!= 1 &&
3556 conf
->geo
.far_offset
== 0)
3558 if (conf
->prev
.far_copies
!= 1 &&
3559 conf
->geo
.far_offset
== 0)
3563 mddev
->degraded
= 0;
3565 i
< conf
->geo
.raid_disks
3566 || i
< conf
->prev
.raid_disks
;
3569 disk
= conf
->mirrors
+ i
;
3571 if (!disk
->rdev
&& disk
->replacement
) {
3572 /* The replacement is all we have - use it */
3573 disk
->rdev
= disk
->replacement
;
3574 disk
->replacement
= NULL
;
3575 clear_bit(Replacement
, &disk
->rdev
->flags
);
3579 !test_bit(In_sync
, &disk
->rdev
->flags
)) {
3580 disk
->head_position
= 0;
3585 disk
->recovery_disabled
= mddev
->recovery_disabled
- 1;
3588 if (mddev
->recovery_cp
!= MaxSector
)
3589 printk(KERN_NOTICE
"md/raid10:%s: not clean"
3590 " -- starting background reconstruction\n",
3593 "md/raid10:%s: active with %d out of %d devices\n",
3594 mdname(mddev
), conf
->geo
.raid_disks
- mddev
->degraded
,
3595 conf
->geo
.raid_disks
);
3597 * Ok, everything is just fine now
3599 mddev
->dev_sectors
= conf
->dev_sectors
;
3600 size
= raid10_size(mddev
, 0, 0);
3601 md_set_array_sectors(mddev
, size
);
3602 mddev
->resync_max_sectors
= size
;
3605 int stripe
= conf
->geo
.raid_disks
*
3606 ((mddev
->chunk_sectors
<< 9) / PAGE_SIZE
);
3607 mddev
->queue
->backing_dev_info
.congested_fn
= raid10_congested
;
3608 mddev
->queue
->backing_dev_info
.congested_data
= mddev
;
3610 /* Calculate max read-ahead size.
3611 * We need to readahead at least twice a whole stripe....
3614 stripe
/= conf
->geo
.near_copies
;
3615 if (mddev
->queue
->backing_dev_info
.ra_pages
< 2 * stripe
)
3616 mddev
->queue
->backing_dev_info
.ra_pages
= 2 * stripe
;
3617 blk_queue_merge_bvec(mddev
->queue
, raid10_mergeable_bvec
);
3621 if (md_integrity_register(mddev
))
3624 if (conf
->reshape_progress
!= MaxSector
) {
3625 unsigned long before_length
, after_length
;
3627 before_length
= ((1 << conf
->prev
.chunk_shift
) *
3628 conf
->prev
.far_copies
);
3629 after_length
= ((1 << conf
->geo
.chunk_shift
) *
3630 conf
->geo
.far_copies
);
3632 if (max(before_length
, after_length
) > min_offset_diff
) {
3633 /* This cannot work */
3634 printk("md/raid10: offset difference not enough to continue reshape\n");
3637 conf
->offset_diff
= min_offset_diff
;
3639 conf
->reshape_safe
= conf
->reshape_progress
;
3640 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
3641 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
3642 set_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
3643 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
3644 mddev
->sync_thread
= md_register_thread(md_do_sync
, mddev
,
3651 md_unregister_thread(&mddev
->thread
);
3652 if (conf
->r10bio_pool
)
3653 mempool_destroy(conf
->r10bio_pool
);
3654 safe_put_page(conf
->tmppage
);
3655 kfree(conf
->mirrors
);
3657 mddev
->private = NULL
;
3662 static int stop(struct mddev
*mddev
)
3664 struct r10conf
*conf
= mddev
->private;
3666 raise_barrier(conf
, 0);
3667 lower_barrier(conf
);
3669 md_unregister_thread(&mddev
->thread
);
3671 /* the unplug fn references 'conf'*/
3672 blk_sync_queue(mddev
->queue
);
3674 if (conf
->r10bio_pool
)
3675 mempool_destroy(conf
->r10bio_pool
);
3676 kfree(conf
->mirrors
);
3678 mddev
->private = NULL
;
3682 static void raid10_quiesce(struct mddev
*mddev
, int state
)
3684 struct r10conf
*conf
= mddev
->private;
3688 raise_barrier(conf
, 0);
3691 lower_barrier(conf
);
3696 static int raid10_resize(struct mddev
*mddev
, sector_t sectors
)
3698 /* Resize of 'far' arrays is not supported.
3699 * For 'near' and 'offset' arrays we can set the
3700 * number of sectors used to be an appropriate multiple
3701 * of the chunk size.
3702 * For 'offset', this is far_copies*chunksize.
3703 * For 'near' the multiplier is the LCM of
3704 * near_copies and raid_disks.
3705 * So if far_copies > 1 && !far_offset, fail.
3706 * Else find LCM(raid_disks, near_copy)*far_copies and
3707 * multiply by chunk_size. Then round to this number.
3708 * This is mostly done by raid10_size()
3710 struct r10conf
*conf
= mddev
->private;
3711 sector_t oldsize
, size
;
3713 if (mddev
->reshape_position
!= MaxSector
)
3716 if (conf
->geo
.far_copies
> 1 && !conf
->geo
.far_offset
)
3719 oldsize
= raid10_size(mddev
, 0, 0);
3720 size
= raid10_size(mddev
, sectors
, 0);
3721 if (mddev
->external_size
&&
3722 mddev
->array_sectors
> size
)
3724 if (mddev
->bitmap
) {
3725 int ret
= bitmap_resize(mddev
->bitmap
, size
, 0, 0);
3729 md_set_array_sectors(mddev
, size
);
3730 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
3731 revalidate_disk(mddev
->gendisk
);
3732 if (sectors
> mddev
->dev_sectors
&&
3733 mddev
->recovery_cp
> oldsize
) {
3734 mddev
->recovery_cp
= oldsize
;
3735 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3737 calc_sectors(conf
, sectors
);
3738 mddev
->dev_sectors
= conf
->dev_sectors
;
3739 mddev
->resync_max_sectors
= size
;
3743 static void *raid10_takeover_raid0(struct mddev
*mddev
)
3745 struct md_rdev
*rdev
;
3746 struct r10conf
*conf
;
3748 if (mddev
->degraded
> 0) {
3749 printk(KERN_ERR
"md/raid10:%s: Error: degraded raid0!\n",
3751 return ERR_PTR(-EINVAL
);
3754 /* Set new parameters */
3755 mddev
->new_level
= 10;
3756 /* new layout: far_copies = 1, near_copies = 2 */
3757 mddev
->new_layout
= (1<<8) + 2;
3758 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3759 mddev
->delta_disks
= mddev
->raid_disks
;
3760 mddev
->raid_disks
*= 2;
3761 /* make sure it will be not marked as dirty */
3762 mddev
->recovery_cp
= MaxSector
;
3764 conf
= setup_conf(mddev
);
3765 if (!IS_ERR(conf
)) {
3766 rdev_for_each(rdev
, mddev
)
3767 if (rdev
->raid_disk
>= 0)
3768 rdev
->new_raid_disk
= rdev
->raid_disk
* 2;
3775 static void *raid10_takeover(struct mddev
*mddev
)
3777 struct r0conf
*raid0_conf
;
3779 /* raid10 can take over:
3780 * raid0 - providing it has only two drives
3782 if (mddev
->level
== 0) {
3783 /* for raid0 takeover only one zone is supported */
3784 raid0_conf
= mddev
->private;
3785 if (raid0_conf
->nr_strip_zones
> 1) {
3786 printk(KERN_ERR
"md/raid10:%s: cannot takeover raid 0"
3787 " with more than one zone.\n",
3789 return ERR_PTR(-EINVAL
);
3791 return raid10_takeover_raid0(mddev
);
3793 return ERR_PTR(-EINVAL
);
3796 static int raid10_check_reshape(struct mddev
*mddev
)
3798 /* Called when there is a request to change
3799 * - layout (to ->new_layout)
3800 * - chunk size (to ->new_chunk_sectors)
3801 * - raid_disks (by delta_disks)
3802 * or when trying to restart a reshape that was ongoing.
3804 * We need to validate the request and possibly allocate
3805 * space if that might be an issue later.
3807 * Currently we reject any reshape of a 'far' mode array,
3808 * allow chunk size to change if new is generally acceptable,
3809 * allow raid_disks to increase, and allow
3810 * a switch between 'near' mode and 'offset' mode.
3812 struct r10conf
*conf
= mddev
->private;
3815 if (conf
->geo
.far_copies
!= 1 && !conf
->geo
.far_offset
)
3818 if (setup_geo(&geo
, mddev
, geo_start
) != conf
->copies
)
3819 /* mustn't change number of copies */
3821 if (geo
.far_copies
> 1 && !geo
.far_offset
)
3822 /* Cannot switch to 'far' mode */
3825 if (mddev
->array_sectors
& geo
.chunk_mask
)
3826 /* not factor of array size */
3829 if (!enough(conf
, -1))
3832 kfree(conf
->mirrors_new
);
3833 conf
->mirrors_new
= NULL
;
3834 if (mddev
->delta_disks
> 0) {
3835 /* allocate new 'mirrors' list */
3836 conf
->mirrors_new
= kzalloc(
3837 sizeof(struct raid10_info
)
3838 *(mddev
->raid_disks
+
3839 mddev
->delta_disks
),
3841 if (!conf
->mirrors_new
)
3848 * Need to check if array has failed when deciding whether to:
3850 * - remove non-faulty devices
3853 * This determination is simple when no reshape is happening.
3854 * However if there is a reshape, we need to carefully check
3855 * both the before and after sections.
3856 * This is because some failed devices may only affect one
3857 * of the two sections, and some non-in_sync devices may
3858 * be insync in the section most affected by failed devices.
3860 static int calc_degraded(struct r10conf
*conf
)
3862 int degraded
, degraded2
;
3867 /* 'prev' section first */
3868 for (i
= 0; i
< conf
->prev
.raid_disks
; i
++) {
3869 struct md_rdev
*rdev
= rcu_dereference(conf
->mirrors
[i
].rdev
);
3870 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
3872 else if (!test_bit(In_sync
, &rdev
->flags
))
3873 /* When we can reduce the number of devices in
3874 * an array, this might not contribute to
3875 * 'degraded'. It does now.
3880 if (conf
->geo
.raid_disks
== conf
->prev
.raid_disks
)
3884 for (i
= 0; i
< conf
->geo
.raid_disks
; i
++) {
3885 struct md_rdev
*rdev
= rcu_dereference(conf
->mirrors
[i
].rdev
);
3886 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
3888 else if (!test_bit(In_sync
, &rdev
->flags
)) {
3889 /* If reshape is increasing the number of devices,
3890 * this section has already been recovered, so
3891 * it doesn't contribute to degraded.
3894 if (conf
->geo
.raid_disks
<= conf
->prev
.raid_disks
)
3899 if (degraded2
> degraded
)
3904 static int raid10_start_reshape(struct mddev
*mddev
)
3906 /* A 'reshape' has been requested. This commits
3907 * the various 'new' fields and sets MD_RECOVER_RESHAPE
3908 * This also checks if there are enough spares and adds them
3910 * We currently require enough spares to make the final
3911 * array non-degraded. We also require that the difference
3912 * between old and new data_offset - on each device - is
3913 * enough that we never risk over-writing.
3916 unsigned long before_length
, after_length
;
3917 sector_t min_offset_diff
= 0;
3920 struct r10conf
*conf
= mddev
->private;
3921 struct md_rdev
*rdev
;
3925 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
3928 if (setup_geo(&new, mddev
, geo_start
) != conf
->copies
)
3931 before_length
= ((1 << conf
->prev
.chunk_shift
) *
3932 conf
->prev
.far_copies
);
3933 after_length
= ((1 << conf
->geo
.chunk_shift
) *
3934 conf
->geo
.far_copies
);
3936 rdev_for_each(rdev
, mddev
) {
3937 if (!test_bit(In_sync
, &rdev
->flags
)
3938 && !test_bit(Faulty
, &rdev
->flags
))
3940 if (rdev
->raid_disk
>= 0) {
3941 long long diff
= (rdev
->new_data_offset
3942 - rdev
->data_offset
);
3943 if (!mddev
->reshape_backwards
)
3947 if (first
|| diff
< min_offset_diff
)
3948 min_offset_diff
= diff
;
3952 if (max(before_length
, after_length
) > min_offset_diff
)
3955 if (spares
< mddev
->delta_disks
)
3958 conf
->offset_diff
= min_offset_diff
;
3959 spin_lock_irq(&conf
->device_lock
);
3960 if (conf
->mirrors_new
) {
3961 memcpy(conf
->mirrors_new
, conf
->mirrors
,
3962 sizeof(struct raid10_info
)*conf
->prev
.raid_disks
);
3964 kfree(conf
->mirrors_old
); /* FIXME and elsewhere */
3965 conf
->mirrors_old
= conf
->mirrors
;
3966 conf
->mirrors
= conf
->mirrors_new
;
3967 conf
->mirrors_new
= NULL
;
3969 setup_geo(&conf
->geo
, mddev
, geo_start
);
3971 if (mddev
->reshape_backwards
) {
3972 sector_t size
= raid10_size(mddev
, 0, 0);
3973 if (size
< mddev
->array_sectors
) {
3974 spin_unlock_irq(&conf
->device_lock
);
3975 printk(KERN_ERR
"md/raid10:%s: array size must be reduce before number of disks\n",
3979 mddev
->resync_max_sectors
= size
;
3980 conf
->reshape_progress
= size
;
3982 conf
->reshape_progress
= 0;
3983 spin_unlock_irq(&conf
->device_lock
);
3985 if (mddev
->delta_disks
&& mddev
->bitmap
) {
3986 ret
= bitmap_resize(mddev
->bitmap
,
3987 raid10_size(mddev
, 0,
3988 conf
->geo
.raid_disks
),
3993 if (mddev
->delta_disks
> 0) {
3994 rdev_for_each(rdev
, mddev
)
3995 if (rdev
->raid_disk
< 0 &&
3996 !test_bit(Faulty
, &rdev
->flags
)) {
3997 if (raid10_add_disk(mddev
, rdev
) == 0) {
3998 if (rdev
->raid_disk
>=
3999 conf
->prev
.raid_disks
)
4000 set_bit(In_sync
, &rdev
->flags
);
4002 rdev
->recovery_offset
= 0;
4004 if (sysfs_link_rdev(mddev
, rdev
))
4005 /* Failure here is OK */;
4007 } else if (rdev
->raid_disk
>= conf
->prev
.raid_disks
4008 && !test_bit(Faulty
, &rdev
->flags
)) {
4009 /* This is a spare that was manually added */
4010 set_bit(In_sync
, &rdev
->flags
);
4013 /* When a reshape changes the number of devices,
4014 * ->degraded is measured against the larger of the
4015 * pre and post numbers.
4017 spin_lock_irq(&conf
->device_lock
);
4018 mddev
->degraded
= calc_degraded(conf
);
4019 spin_unlock_irq(&conf
->device_lock
);
4020 mddev
->raid_disks
= conf
->geo
.raid_disks
;
4021 mddev
->reshape_position
= conf
->reshape_progress
;
4022 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
4024 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
4025 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
4026 set_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
4027 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
4029 mddev
->sync_thread
= md_register_thread(md_do_sync
, mddev
,
4031 if (!mddev
->sync_thread
) {
4035 conf
->reshape_checkpoint
= jiffies
;
4036 md_wakeup_thread(mddev
->sync_thread
);
4037 md_new_event(mddev
);
4041 mddev
->recovery
= 0;
4042 spin_lock_irq(&conf
->device_lock
);
4043 conf
->geo
= conf
->prev
;
4044 mddev
->raid_disks
= conf
->geo
.raid_disks
;
4045 rdev_for_each(rdev
, mddev
)
4046 rdev
->new_data_offset
= rdev
->data_offset
;
4048 conf
->reshape_progress
= MaxSector
;
4049 mddev
->reshape_position
= MaxSector
;
4050 spin_unlock_irq(&conf
->device_lock
);
4054 /* Calculate the last device-address that could contain
4055 * any block from the chunk that includes the array-address 's'
4056 * and report the next address.
4057 * i.e. the address returned will be chunk-aligned and after
4058 * any data that is in the chunk containing 's'.
4060 static sector_t
last_dev_address(sector_t s
, struct geom
*geo
)
4062 s
= (s
| geo
->chunk_mask
) + 1;
4063 s
>>= geo
->chunk_shift
;
4064 s
*= geo
->near_copies
;
4065 s
= DIV_ROUND_UP_SECTOR_T(s
, geo
->raid_disks
);
4066 s
*= geo
->far_copies
;
4067 s
<<= geo
->chunk_shift
;
4071 /* Calculate the first device-address that could contain
4072 * any block from the chunk that includes the array-address 's'.
4073 * This too will be the start of a chunk
4075 static sector_t
first_dev_address(sector_t s
, struct geom
*geo
)
4077 s
>>= geo
->chunk_shift
;
4078 s
*= geo
->near_copies
;
4079 sector_div(s
, geo
->raid_disks
);
4080 s
*= geo
->far_copies
;
4081 s
<<= geo
->chunk_shift
;
4085 static sector_t
reshape_request(struct mddev
*mddev
, sector_t sector_nr
,
4088 /* We simply copy at most one chunk (smallest of old and new)
4089 * at a time, possibly less if that exceeds RESYNC_PAGES,
4090 * or we hit a bad block or something.
4091 * This might mean we pause for normal IO in the middle of
4092 * a chunk, but that is not a problem was mddev->reshape_position
4093 * can record any location.
4095 * If we will want to write to a location that isn't
4096 * yet recorded as 'safe' (i.e. in metadata on disk) then
4097 * we need to flush all reshape requests and update the metadata.
4099 * When reshaping forwards (e.g. to more devices), we interpret
4100 * 'safe' as the earliest block which might not have been copied
4101 * down yet. We divide this by previous stripe size and multiply
4102 * by previous stripe length to get lowest device offset that we
4103 * cannot write to yet.
4104 * We interpret 'sector_nr' as an address that we want to write to.
4105 * From this we use last_device_address() to find where we might
4106 * write to, and first_device_address on the 'safe' position.
4107 * If this 'next' write position is after the 'safe' position,
4108 * we must update the metadata to increase the 'safe' position.
4110 * When reshaping backwards, we round in the opposite direction
4111 * and perform the reverse test: next write position must not be
4112 * less than current safe position.
4114 * In all this the minimum difference in data offsets
4115 * (conf->offset_diff - always positive) allows a bit of slack,
4116 * so next can be after 'safe', but not by more than offset_disk
4118 * We need to prepare all the bios here before we start any IO
4119 * to ensure the size we choose is acceptable to all devices.
4120 * The means one for each copy for write-out and an extra one for
4122 * We store the read-in bio in ->master_bio and the others in
4123 * ->devs[x].bio and ->devs[x].repl_bio.
4125 struct r10conf
*conf
= mddev
->private;
4126 struct r10bio
*r10_bio
;
4127 sector_t next
, safe
, last
;
4131 struct md_rdev
*rdev
;
4134 struct bio
*bio
, *read_bio
;
4135 int sectors_done
= 0;
4137 if (sector_nr
== 0) {
4138 /* If restarting in the middle, skip the initial sectors */
4139 if (mddev
->reshape_backwards
&&
4140 conf
->reshape_progress
< raid10_size(mddev
, 0, 0)) {
4141 sector_nr
= (raid10_size(mddev
, 0, 0)
4142 - conf
->reshape_progress
);
4143 } else if (!mddev
->reshape_backwards
&&
4144 conf
->reshape_progress
> 0)
4145 sector_nr
= conf
->reshape_progress
;
4147 mddev
->curr_resync_completed
= sector_nr
;
4148 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
4154 /* We don't use sector_nr to track where we are up to
4155 * as that doesn't work well for ->reshape_backwards.
4156 * So just use ->reshape_progress.
4158 if (mddev
->reshape_backwards
) {
4159 /* 'next' is the earliest device address that we might
4160 * write to for this chunk in the new layout
4162 next
= first_dev_address(conf
->reshape_progress
- 1,
4165 /* 'safe' is the last device address that we might read from
4166 * in the old layout after a restart
4168 safe
= last_dev_address(conf
->reshape_safe
- 1,
4171 if (next
+ conf
->offset_diff
< safe
)
4174 last
= conf
->reshape_progress
- 1;
4175 sector_nr
= last
& ~(sector_t
)(conf
->geo
.chunk_mask
4176 & conf
->prev
.chunk_mask
);
4177 if (sector_nr
+ RESYNC_BLOCK_SIZE
/512 < last
)
4178 sector_nr
= last
+ 1 - RESYNC_BLOCK_SIZE
/512;
4180 /* 'next' is after the last device address that we
4181 * might write to for this chunk in the new layout
4183 next
= last_dev_address(conf
->reshape_progress
, &conf
->geo
);
4185 /* 'safe' is the earliest device address that we might
4186 * read from in the old layout after a restart
4188 safe
= first_dev_address(conf
->reshape_safe
, &conf
->prev
);
4190 /* Need to update metadata if 'next' might be beyond 'safe'
4191 * as that would possibly corrupt data
4193 if (next
> safe
+ conf
->offset_diff
)
4196 sector_nr
= conf
->reshape_progress
;
4197 last
= sector_nr
| (conf
->geo
.chunk_mask
4198 & conf
->prev
.chunk_mask
);
4200 if (sector_nr
+ RESYNC_BLOCK_SIZE
/512 <= last
)
4201 last
= sector_nr
+ RESYNC_BLOCK_SIZE
/512 - 1;
4205 time_after(jiffies
, conf
->reshape_checkpoint
+ 10*HZ
)) {
4206 /* Need to update reshape_position in metadata */
4208 mddev
->reshape_position
= conf
->reshape_progress
;
4209 if (mddev
->reshape_backwards
)
4210 mddev
->curr_resync_completed
= raid10_size(mddev
, 0, 0)
4211 - conf
->reshape_progress
;
4213 mddev
->curr_resync_completed
= conf
->reshape_progress
;
4214 conf
->reshape_checkpoint
= jiffies
;
4215 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
4216 md_wakeup_thread(mddev
->thread
);
4217 wait_event(mddev
->sb_wait
, mddev
->flags
== 0 ||
4218 kthread_should_stop());
4219 conf
->reshape_safe
= mddev
->reshape_position
;
4220 allow_barrier(conf
);
4224 /* Now schedule reads for blocks from sector_nr to last */
4225 r10_bio
= mempool_alloc(conf
->r10buf_pool
, GFP_NOIO
);
4226 raise_barrier(conf
, sectors_done
!= 0);
4227 atomic_set(&r10_bio
->remaining
, 0);
4228 r10_bio
->mddev
= mddev
;
4229 r10_bio
->sector
= sector_nr
;
4230 set_bit(R10BIO_IsReshape
, &r10_bio
->state
);
4231 r10_bio
->sectors
= last
- sector_nr
+ 1;
4232 rdev
= read_balance(conf
, r10_bio
, &max_sectors
);
4233 BUG_ON(!test_bit(R10BIO_Previous
, &r10_bio
->state
));
4236 /* Cannot read from here, so need to record bad blocks
4237 * on all the target devices.
4240 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4241 return sectors_done
;
4244 read_bio
= bio_alloc_mddev(GFP_KERNEL
, RESYNC_PAGES
, mddev
);
4246 read_bio
->bi_bdev
= rdev
->bdev
;
4247 read_bio
->bi_sector
= (r10_bio
->devs
[r10_bio
->read_slot
].addr
4248 + rdev
->data_offset
);
4249 read_bio
->bi_private
= r10_bio
;
4250 read_bio
->bi_end_io
= end_sync_read
;
4251 read_bio
->bi_rw
= READ
;
4252 read_bio
->bi_flags
&= ~(BIO_POOL_MASK
- 1);
4253 read_bio
->bi_flags
|= 1 << BIO_UPTODATE
;
4254 read_bio
->bi_vcnt
= 0;
4255 read_bio
->bi_idx
= 0;
4256 read_bio
->bi_size
= 0;
4257 r10_bio
->master_bio
= read_bio
;
4258 r10_bio
->read_slot
= r10_bio
->devs
[r10_bio
->read_slot
].devnum
;
4260 /* Now find the locations in the new layout */
4261 __raid10_find_phys(&conf
->geo
, r10_bio
);
4264 read_bio
->bi_next
= NULL
;
4266 for (s
= 0; s
< conf
->copies
*2; s
++) {
4268 int d
= r10_bio
->devs
[s
/2].devnum
;
4269 struct md_rdev
*rdev2
;
4271 rdev2
= conf
->mirrors
[d
].replacement
;
4272 b
= r10_bio
->devs
[s
/2].repl_bio
;
4274 rdev2
= conf
->mirrors
[d
].rdev
;
4275 b
= r10_bio
->devs
[s
/2].bio
;
4277 if (!rdev2
|| test_bit(Faulty
, &rdev2
->flags
))
4279 b
->bi_bdev
= rdev2
->bdev
;
4280 b
->bi_sector
= r10_bio
->devs
[s
/2].addr
+ rdev2
->new_data_offset
;
4281 b
->bi_private
= r10_bio
;
4282 b
->bi_end_io
= end_reshape_write
;
4284 b
->bi_flags
&= ~(BIO_POOL_MASK
- 1);
4285 b
->bi_flags
|= 1 << BIO_UPTODATE
;
4293 /* Now add as many pages as possible to all of these bios. */
4296 for (s
= 0 ; s
< max_sectors
; s
+= PAGE_SIZE
>> 9) {
4297 struct page
*page
= r10_bio
->devs
[0].bio
->bi_io_vec
[s
/(PAGE_SIZE
>>9)].bv_page
;
4298 int len
= (max_sectors
- s
) << 9;
4299 if (len
> PAGE_SIZE
)
4301 for (bio
= blist
; bio
; bio
= bio
->bi_next
) {
4303 if (bio_add_page(bio
, page
, len
, 0))
4306 /* Didn't fit, must stop */
4308 bio2
&& bio2
!= bio
;
4309 bio2
= bio2
->bi_next
) {
4310 /* Remove last page from this bio */
4312 bio2
->bi_size
-= len
;
4313 bio2
->bi_flags
&= ~(1<<BIO_SEG_VALID
);
4317 sector_nr
+= len
>> 9;
4318 nr_sectors
+= len
>> 9;
4321 r10_bio
->sectors
= nr_sectors
;
4323 /* Now submit the read */
4324 md_sync_acct(read_bio
->bi_bdev
, r10_bio
->sectors
);
4325 atomic_inc(&r10_bio
->remaining
);
4326 read_bio
->bi_next
= NULL
;
4327 generic_make_request(read_bio
);
4328 sector_nr
+= nr_sectors
;
4329 sectors_done
+= nr_sectors
;
4330 if (sector_nr
<= last
)
4333 /* Now that we have done the whole section we can
4334 * update reshape_progress
4336 if (mddev
->reshape_backwards
)
4337 conf
->reshape_progress
-= sectors_done
;
4339 conf
->reshape_progress
+= sectors_done
;
4341 return sectors_done
;
4344 static void end_reshape_request(struct r10bio
*r10_bio
);
4345 static int handle_reshape_read_error(struct mddev
*mddev
,
4346 struct r10bio
*r10_bio
);
4347 static void reshape_request_write(struct mddev
*mddev
, struct r10bio
*r10_bio
)
4349 /* Reshape read completed. Hopefully we have a block
4351 * If we got a read error then we do sync 1-page reads from
4352 * elsewhere until we find the data - or give up.
4354 struct r10conf
*conf
= mddev
->private;
4357 if (!test_bit(R10BIO_Uptodate
, &r10_bio
->state
))
4358 if (handle_reshape_read_error(mddev
, r10_bio
) < 0) {
4359 /* Reshape has been aborted */
4360 md_done_sync(mddev
, r10_bio
->sectors
, 0);
4364 /* We definitely have the data in the pages, schedule the
4367 atomic_set(&r10_bio
->remaining
, 1);
4368 for (s
= 0; s
< conf
->copies
*2; s
++) {
4370 int d
= r10_bio
->devs
[s
/2].devnum
;
4371 struct md_rdev
*rdev
;
4373 rdev
= conf
->mirrors
[d
].replacement
;
4374 b
= r10_bio
->devs
[s
/2].repl_bio
;
4376 rdev
= conf
->mirrors
[d
].rdev
;
4377 b
= r10_bio
->devs
[s
/2].bio
;
4379 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
4381 atomic_inc(&rdev
->nr_pending
);
4382 md_sync_acct(b
->bi_bdev
, r10_bio
->sectors
);
4383 atomic_inc(&r10_bio
->remaining
);
4385 generic_make_request(b
);
4387 end_reshape_request(r10_bio
);
4390 static void end_reshape(struct r10conf
*conf
)
4392 if (test_bit(MD_RECOVERY_INTR
, &conf
->mddev
->recovery
))
4395 spin_lock_irq(&conf
->device_lock
);
4396 conf
->prev
= conf
->geo
;
4397 md_finish_reshape(conf
->mddev
);
4399 conf
->reshape_progress
= MaxSector
;
4400 spin_unlock_irq(&conf
->device_lock
);
4402 /* read-ahead size must cover two whole stripes, which is
4403 * 2 * (datadisks) * chunksize where 'n' is the number of raid devices
4405 if (conf
->mddev
->queue
) {
4406 int stripe
= conf
->geo
.raid_disks
*
4407 ((conf
->mddev
->chunk_sectors
<< 9) / PAGE_SIZE
);
4408 stripe
/= conf
->geo
.near_copies
;
4409 if (conf
->mddev
->queue
->backing_dev_info
.ra_pages
< 2 * stripe
)
4410 conf
->mddev
->queue
->backing_dev_info
.ra_pages
= 2 * stripe
;
4416 static int handle_reshape_read_error(struct mddev
*mddev
,
4417 struct r10bio
*r10_bio
)
4419 /* Use sync reads to get the blocks from somewhere else */
4420 int sectors
= r10_bio
->sectors
;
4421 struct r10conf
*conf
= mddev
->private;
4423 struct r10bio r10_bio
;
4424 struct r10dev devs
[conf
->copies
];
4426 struct r10bio
*r10b
= &on_stack
.r10_bio
;
4429 struct bio_vec
*bvec
= r10_bio
->master_bio
->bi_io_vec
;
4431 r10b
->sector
= r10_bio
->sector
;
4432 __raid10_find_phys(&conf
->prev
, r10b
);
4437 int first_slot
= slot
;
4439 if (s
> (PAGE_SIZE
>> 9))
4443 int d
= r10b
->devs
[slot
].devnum
;
4444 struct md_rdev
*rdev
= conf
->mirrors
[d
].rdev
;
4447 test_bit(Faulty
, &rdev
->flags
) ||
4448 !test_bit(In_sync
, &rdev
->flags
))
4451 addr
= r10b
->devs
[slot
].addr
+ idx
* PAGE_SIZE
;
4452 success
= sync_page_io(rdev
,
4461 if (slot
>= conf
->copies
)
4463 if (slot
== first_slot
)
4467 /* couldn't read this block, must give up */
4468 set_bit(MD_RECOVERY_INTR
,
4478 static void end_reshape_write(struct bio
*bio
, int error
)
4480 int uptodate
= test_bit(BIO_UPTODATE
, &bio
->bi_flags
);
4481 struct r10bio
*r10_bio
= bio
->bi_private
;
4482 struct mddev
*mddev
= r10_bio
->mddev
;
4483 struct r10conf
*conf
= mddev
->private;
4487 struct md_rdev
*rdev
= NULL
;
4489 d
= find_bio_disk(conf
, r10_bio
, bio
, &slot
, &repl
);
4491 rdev
= conf
->mirrors
[d
].replacement
;
4494 rdev
= conf
->mirrors
[d
].rdev
;
4498 /* FIXME should record badblock */
4499 md_error(mddev
, rdev
);
4502 rdev_dec_pending(rdev
, mddev
);
4503 end_reshape_request(r10_bio
);
4506 static void end_reshape_request(struct r10bio
*r10_bio
)
4508 if (!atomic_dec_and_test(&r10_bio
->remaining
))
4510 md_done_sync(r10_bio
->mddev
, r10_bio
->sectors
, 1);
4511 bio_put(r10_bio
->master_bio
);
4515 static void raid10_finish_reshape(struct mddev
*mddev
)
4517 struct r10conf
*conf
= mddev
->private;
4519 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
4522 if (mddev
->delta_disks
> 0) {
4523 sector_t size
= raid10_size(mddev
, 0, 0);
4524 md_set_array_sectors(mddev
, size
);
4525 if (mddev
->recovery_cp
> mddev
->resync_max_sectors
) {
4526 mddev
->recovery_cp
= mddev
->resync_max_sectors
;
4527 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4529 mddev
->resync_max_sectors
= size
;
4530 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
4531 revalidate_disk(mddev
->gendisk
);
4534 for (d
= conf
->geo
.raid_disks
;
4535 d
< conf
->geo
.raid_disks
- mddev
->delta_disks
;
4537 struct md_rdev
*rdev
= conf
->mirrors
[d
].rdev
;
4539 clear_bit(In_sync
, &rdev
->flags
);
4540 rdev
= conf
->mirrors
[d
].replacement
;
4542 clear_bit(In_sync
, &rdev
->flags
);
4545 mddev
->layout
= mddev
->new_layout
;
4546 mddev
->chunk_sectors
= 1 << conf
->geo
.chunk_shift
;
4547 mddev
->reshape_position
= MaxSector
;
4548 mddev
->delta_disks
= 0;
4549 mddev
->reshape_backwards
= 0;
4552 static struct md_personality raid10_personality
=
4556 .owner
= THIS_MODULE
,
4557 .make_request
= make_request
,
4561 .error_handler
= error
,
4562 .hot_add_disk
= raid10_add_disk
,
4563 .hot_remove_disk
= raid10_remove_disk
,
4564 .spare_active
= raid10_spare_active
,
4565 .sync_request
= sync_request
,
4566 .quiesce
= raid10_quiesce
,
4567 .size
= raid10_size
,
4568 .resize
= raid10_resize
,
4569 .takeover
= raid10_takeover
,
4570 .check_reshape
= raid10_check_reshape
,
4571 .start_reshape
= raid10_start_reshape
,
4572 .finish_reshape
= raid10_finish_reshape
,
4575 static int __init
raid_init(void)
4577 return register_md_personality(&raid10_personality
);
4580 static void raid_exit(void)
4582 unregister_md_personality(&raid10_personality
);
4585 module_init(raid_init
);
4586 module_exit(raid_exit
);
4587 MODULE_LICENSE("GPL");
4588 MODULE_DESCRIPTION("RAID10 (striped mirror) personality for MD");
4589 MODULE_ALIAS("md-personality-9"); /* RAID10 */
4590 MODULE_ALIAS("md-raid10");
4591 MODULE_ALIAS("md-level-10");
4593 module_param(max_queued_requests
, int, S_IRUGO
|S_IWUSR
);