2 * raid1.c : Multiple Devices driver for Linux
4 * Copyright (C) 1999, 2000, 2001 Ingo Molnar, Red Hat
6 * Copyright (C) 1996, 1997, 1998 Ingo Molnar, Miguel de Icaza, Gadi Oxman
8 * RAID-1 management functions.
10 * Better read-balancing code written by Mika Kuoppala <miku@iki.fi>, 2000
12 * Fixes to reconstruction by Jakob Østergaard" <jakob@ostenfeld.dk>
13 * Various fixes by Neil Brown <neilb@cse.unsw.edu.au>
15 * Changes by Peter T. Breuer <ptb@it.uc3m.es> 31/1/2003 to support
16 * bitmapped intelligence in resync:
18 * - bitmap marked during normal i/o
19 * - bitmap used to skip nondirty blocks during sync
21 * Additions to bitmap code, (C) 2003-2004 Paul Clements, SteelEye Technology:
22 * - persistent bitmap code
24 * This program is free software; you can redistribute it and/or modify
25 * it under the terms of the GNU General Public License as published by
26 * the Free Software Foundation; either version 2, or (at your option)
29 * You should have received a copy of the GNU General Public License
30 * (for example /usr/src/linux/COPYING); if not, write to the Free
31 * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
34 #include "dm-bio-list.h"
35 #include <linux/raid/raid1.h>
36 #include <linux/raid/bitmap.h>
40 #define PRINTK(x...) printk(x)
46 * Number of guaranteed r1bios in case of extreme VM load:
48 #define NR_RAID1_BIOS 256
50 static mdk_personality_t raid1_personality
;
52 static void unplug_slaves(mddev_t
*mddev
);
55 static void * r1bio_pool_alloc(unsigned int __nocast gfp_flags
, void *data
)
57 struct pool_info
*pi
= data
;
59 int size
= offsetof(r1bio_t
, bios
[pi
->raid_disks
]);
61 /* allocate a r1bio with room for raid_disks entries in the bios array */
62 r1_bio
= kmalloc(size
, gfp_flags
);
64 memset(r1_bio
, 0, size
);
66 unplug_slaves(pi
->mddev
);
71 static void r1bio_pool_free(void *r1_bio
, void *data
)
76 #define RESYNC_BLOCK_SIZE (64*1024)
77 //#define RESYNC_BLOCK_SIZE PAGE_SIZE
78 #define RESYNC_SECTORS (RESYNC_BLOCK_SIZE >> 9)
79 #define RESYNC_PAGES ((RESYNC_BLOCK_SIZE + PAGE_SIZE-1) / PAGE_SIZE)
80 #define RESYNC_WINDOW (2048*1024)
82 static void * r1buf_pool_alloc(unsigned int __nocast gfp_flags
, void *data
)
84 struct pool_info
*pi
= data
;
90 r1_bio
= r1bio_pool_alloc(gfp_flags
, pi
);
92 unplug_slaves(pi
->mddev
);
97 * Allocate bios : 1 for reading, n-1 for writing
99 for (j
= pi
->raid_disks
; j
-- ; ) {
100 bio
= bio_alloc(gfp_flags
, RESYNC_PAGES
);
103 r1_bio
->bios
[j
] = bio
;
106 * Allocate RESYNC_PAGES data pages and attach them to
109 bio
= r1_bio
->bios
[0];
110 for (i
= 0; i
< RESYNC_PAGES
; i
++) {
111 page
= alloc_page(gfp_flags
);
115 bio
->bi_io_vec
[i
].bv_page
= page
;
118 r1_bio
->master_bio
= NULL
;
124 __free_page(bio
->bi_io_vec
[i
-1].bv_page
);
126 while ( ++j
< pi
->raid_disks
)
127 bio_put(r1_bio
->bios
[j
]);
128 r1bio_pool_free(r1_bio
, data
);
132 static void r1buf_pool_free(void *__r1_bio
, void *data
)
134 struct pool_info
*pi
= data
;
136 r1bio_t
*r1bio
= __r1_bio
;
137 struct bio
*bio
= r1bio
->bios
[0];
139 for (i
= 0; i
< RESYNC_PAGES
; i
++) {
140 __free_page(bio
->bi_io_vec
[i
].bv_page
);
141 bio
->bi_io_vec
[i
].bv_page
= NULL
;
143 for (i
=0 ; i
< pi
->raid_disks
; i
++)
144 bio_put(r1bio
->bios
[i
]);
146 r1bio_pool_free(r1bio
, data
);
149 static void put_all_bios(conf_t
*conf
, r1bio_t
*r1_bio
)
153 for (i
= 0; i
< conf
->raid_disks
; i
++) {
154 struct bio
**bio
= r1_bio
->bios
+ i
;
161 static inline void free_r1bio(r1bio_t
*r1_bio
)
165 conf_t
*conf
= mddev_to_conf(r1_bio
->mddev
);
168 * Wake up any possible resync thread that waits for the device
171 spin_lock_irqsave(&conf
->resync_lock
, flags
);
172 if (!--conf
->nr_pending
) {
173 wake_up(&conf
->wait_idle
);
174 wake_up(&conf
->wait_resume
);
176 spin_unlock_irqrestore(&conf
->resync_lock
, flags
);
178 put_all_bios(conf
, r1_bio
);
179 mempool_free(r1_bio
, conf
->r1bio_pool
);
182 static inline void put_buf(r1bio_t
*r1_bio
)
184 conf_t
*conf
= mddev_to_conf(r1_bio
->mddev
);
187 mempool_free(r1_bio
, conf
->r1buf_pool
);
189 spin_lock_irqsave(&conf
->resync_lock
, flags
);
193 wake_up(&conf
->wait_resume
);
194 wake_up(&conf
->wait_idle
);
196 if (!--conf
->nr_pending
) {
197 wake_up(&conf
->wait_idle
);
198 wake_up(&conf
->wait_resume
);
200 spin_unlock_irqrestore(&conf
->resync_lock
, flags
);
203 static void reschedule_retry(r1bio_t
*r1_bio
)
206 mddev_t
*mddev
= r1_bio
->mddev
;
207 conf_t
*conf
= mddev_to_conf(mddev
);
209 spin_lock_irqsave(&conf
->device_lock
, flags
);
210 list_add(&r1_bio
->retry_list
, &conf
->retry_list
);
211 spin_unlock_irqrestore(&conf
->device_lock
, flags
);
213 md_wakeup_thread(mddev
->thread
);
217 * raid_end_bio_io() is called when we have finished servicing a mirrored
218 * operation and are ready to return a success/failure code to the buffer
221 static void raid_end_bio_io(r1bio_t
*r1_bio
)
223 struct bio
*bio
= r1_bio
->master_bio
;
225 bio_endio(bio
, bio
->bi_size
,
226 test_bit(R1BIO_Uptodate
, &r1_bio
->state
) ? 0 : -EIO
);
231 * Update disk head position estimator based on IRQ completion info.
233 static inline void update_head_pos(int disk
, r1bio_t
*r1_bio
)
235 conf_t
*conf
= mddev_to_conf(r1_bio
->mddev
);
237 conf
->mirrors
[disk
].head_position
=
238 r1_bio
->sector
+ (r1_bio
->sectors
);
241 static int raid1_end_read_request(struct bio
*bio
, unsigned int bytes_done
, int error
)
243 int uptodate
= test_bit(BIO_UPTODATE
, &bio
->bi_flags
);
244 r1bio_t
* r1_bio
= (r1bio_t
*)(bio
->bi_private
);
246 conf_t
*conf
= mddev_to_conf(r1_bio
->mddev
);
251 mirror
= r1_bio
->read_disk
;
253 * this branch is our 'one mirror IO has finished' event handler:
256 md_error(r1_bio
->mddev
, conf
->mirrors
[mirror
].rdev
);
259 * Set R1BIO_Uptodate in our master bio, so that
260 * we will return a good error code for to the higher
261 * levels even if IO on some other mirrored buffer fails.
263 * The 'master' represents the composite IO operation to
264 * user-side. So if something waits for IO, then it will
265 * wait for the 'master' bio.
267 set_bit(R1BIO_Uptodate
, &r1_bio
->state
);
269 update_head_pos(mirror
, r1_bio
);
272 * we have only one bio on the read side
275 raid_end_bio_io(r1_bio
);
280 char b
[BDEVNAME_SIZE
];
281 if (printk_ratelimit())
282 printk(KERN_ERR
"raid1: %s: rescheduling sector %llu\n",
283 bdevname(conf
->mirrors
[mirror
].rdev
->bdev
,b
), (unsigned long long)r1_bio
->sector
);
284 reschedule_retry(r1_bio
);
287 rdev_dec_pending(conf
->mirrors
[mirror
].rdev
, conf
->mddev
);
291 static int raid1_end_write_request(struct bio
*bio
, unsigned int bytes_done
, int error
)
293 int uptodate
= test_bit(BIO_UPTODATE
, &bio
->bi_flags
);
294 r1bio_t
* r1_bio
= (r1bio_t
*)(bio
->bi_private
);
296 conf_t
*conf
= mddev_to_conf(r1_bio
->mddev
);
301 for (mirror
= 0; mirror
< conf
->raid_disks
; mirror
++)
302 if (r1_bio
->bios
[mirror
] == bio
)
306 * this branch is our 'one mirror IO has finished' event handler:
309 md_error(r1_bio
->mddev
, conf
->mirrors
[mirror
].rdev
);
310 /* an I/O failed, we can't clear the bitmap */
311 set_bit(R1BIO_Degraded
, &r1_bio
->state
);
314 * Set R1BIO_Uptodate in our master bio, so that
315 * we will return a good error code for to the higher
316 * levels even if IO on some other mirrored buffer fails.
318 * The 'master' represents the composite IO operation to
319 * user-side. So if something waits for IO, then it will
320 * wait for the 'master' bio.
322 set_bit(R1BIO_Uptodate
, &r1_bio
->state
);
324 update_head_pos(mirror
, r1_bio
);
328 * Let's see if all mirrored write operations have finished
331 if (atomic_dec_and_test(&r1_bio
->remaining
)) {
332 /* clear the bitmap if all writes complete successfully */
333 bitmap_endwrite(r1_bio
->mddev
->bitmap
, r1_bio
->sector
,
335 !test_bit(R1BIO_Degraded
, &r1_bio
->state
));
336 md_write_end(r1_bio
->mddev
);
337 raid_end_bio_io(r1_bio
);
340 rdev_dec_pending(conf
->mirrors
[mirror
].rdev
, conf
->mddev
);
346 * This routine returns the disk from which the requested read should
347 * be done. There is a per-array 'next expected sequential IO' sector
348 * number - if this matches on the next IO then we use the last disk.
349 * There is also a per-disk 'last know head position' sector that is
350 * maintained from IRQ contexts, both the normal and the resync IO
351 * completion handlers update this position correctly. If there is no
352 * perfect sequential match then we pick the disk whose head is closest.
354 * If there are 2 mirrors in the same 2 devices, performance degrades
355 * because position is mirror, not device based.
357 * The rdev for the device selected will have nr_pending incremented.
359 static int read_balance(conf_t
*conf
, r1bio_t
*r1_bio
)
361 const unsigned long this_sector
= r1_bio
->sector
;
362 int new_disk
= conf
->last_used
, disk
= new_disk
;
364 const int sectors
= r1_bio
->sectors
;
365 sector_t new_distance
, current_distance
;
370 * Check if we can balance. We can balance on the whole
371 * device if no resync is going on, or below the resync window.
372 * We take the first readable disk when above the resync window.
375 if (conf
->mddev
->recovery_cp
< MaxSector
&&
376 (this_sector
+ sectors
>= conf
->next_resync
)) {
377 /* Choose the first operation device, for consistancy */
380 for (rdev
= conf
->mirrors
[new_disk
].rdev
;
381 !rdev
|| !rdev
->in_sync
382 || test_bit(WriteMostly
, &rdev
->flags
);
383 rdev
= conf
->mirrors
[++new_disk
].rdev
) {
385 if (rdev
&& rdev
->in_sync
)
386 wonly_disk
= new_disk
;
388 if (new_disk
== conf
->raid_disks
- 1) {
389 new_disk
= wonly_disk
;
397 /* make sure the disk is operational */
398 for (rdev
= conf
->mirrors
[new_disk
].rdev
;
399 !rdev
|| !rdev
->in_sync
||
400 test_bit(WriteMostly
, &rdev
->flags
);
401 rdev
= conf
->mirrors
[new_disk
].rdev
) {
403 if (rdev
&& rdev
->in_sync
)
404 wonly_disk
= new_disk
;
407 new_disk
= conf
->raid_disks
;
409 if (new_disk
== disk
) {
410 new_disk
= wonly_disk
;
419 /* now disk == new_disk == starting point for search */
422 * Don't change to another disk for sequential reads:
424 if (conf
->next_seq_sect
== this_sector
)
426 if (this_sector
== conf
->mirrors
[new_disk
].head_position
)
429 current_distance
= abs(this_sector
- conf
->mirrors
[disk
].head_position
);
431 /* Find the disk whose head is closest */
435 disk
= conf
->raid_disks
;
438 rdev
= conf
->mirrors
[disk
].rdev
;
442 test_bit(WriteMostly
, &rdev
->flags
))
445 if (!atomic_read(&rdev
->nr_pending
)) {
449 new_distance
= abs(this_sector
- conf
->mirrors
[disk
].head_position
);
450 if (new_distance
< current_distance
) {
451 current_distance
= new_distance
;
454 } while (disk
!= conf
->last_used
);
460 rdev
= conf
->mirrors
[new_disk
].rdev
;
463 atomic_inc(&rdev
->nr_pending
);
464 if (!rdev
->in_sync
) {
465 /* cannot risk returning a device that failed
466 * before we inc'ed nr_pending
468 atomic_dec(&rdev
->nr_pending
);
471 conf
->next_seq_sect
= this_sector
+ sectors
;
472 conf
->last_used
= new_disk
;
479 static void unplug_slaves(mddev_t
*mddev
)
481 conf_t
*conf
= mddev_to_conf(mddev
);
485 for (i
=0; i
<mddev
->raid_disks
; i
++) {
486 mdk_rdev_t
*rdev
= conf
->mirrors
[i
].rdev
;
487 if (rdev
&& !rdev
->faulty
&& atomic_read(&rdev
->nr_pending
)) {
488 request_queue_t
*r_queue
= bdev_get_queue(rdev
->bdev
);
490 atomic_inc(&rdev
->nr_pending
);
493 if (r_queue
->unplug_fn
)
494 r_queue
->unplug_fn(r_queue
);
496 rdev_dec_pending(rdev
, mddev
);
503 static void raid1_unplug(request_queue_t
*q
)
505 mddev_t
*mddev
= q
->queuedata
;
507 unplug_slaves(mddev
);
508 md_wakeup_thread(mddev
->thread
);
511 static int raid1_issue_flush(request_queue_t
*q
, struct gendisk
*disk
,
512 sector_t
*error_sector
)
514 mddev_t
*mddev
= q
->queuedata
;
515 conf_t
*conf
= mddev_to_conf(mddev
);
519 for (i
=0; i
<mddev
->raid_disks
&& ret
== 0; i
++) {
520 mdk_rdev_t
*rdev
= conf
->mirrors
[i
].rdev
;
521 if (rdev
&& !rdev
->faulty
) {
522 struct block_device
*bdev
= rdev
->bdev
;
523 request_queue_t
*r_queue
= bdev_get_queue(bdev
);
525 if (!r_queue
->issue_flush_fn
)
528 atomic_inc(&rdev
->nr_pending
);
530 ret
= r_queue
->issue_flush_fn(r_queue
, bdev
->bd_disk
,
532 rdev_dec_pending(rdev
, mddev
);
542 * Throttle resync depth, so that we can both get proper overlapping of
543 * requests, but are still able to handle normal requests quickly.
545 #define RESYNC_DEPTH 32
547 static void device_barrier(conf_t
*conf
, sector_t sect
)
549 spin_lock_irq(&conf
->resync_lock
);
550 wait_event_lock_irq(conf
->wait_idle
, !waitqueue_active(&conf
->wait_resume
),
551 conf
->resync_lock
, raid1_unplug(conf
->mddev
->queue
));
553 if (!conf
->barrier
++) {
554 wait_event_lock_irq(conf
->wait_idle
, !conf
->nr_pending
,
555 conf
->resync_lock
, raid1_unplug(conf
->mddev
->queue
));
556 if (conf
->nr_pending
)
559 wait_event_lock_irq(conf
->wait_resume
, conf
->barrier
< RESYNC_DEPTH
,
560 conf
->resync_lock
, raid1_unplug(conf
->mddev
->queue
));
561 conf
->next_resync
= sect
;
562 spin_unlock_irq(&conf
->resync_lock
);
565 static int make_request(request_queue_t
*q
, struct bio
* bio
)
567 mddev_t
*mddev
= q
->queuedata
;
568 conf_t
*conf
= mddev_to_conf(mddev
);
569 mirror_info_t
*mirror
;
571 struct bio
*read_bio
;
572 int i
, targets
= 0, disks
;
574 struct bitmap
*bitmap
= mddev
->bitmap
;
578 if (unlikely(bio_barrier(bio
))) {
579 bio_endio(bio
, bio
->bi_size
, -EOPNOTSUPP
);
584 * Register the new request and wait if the reconstruction
585 * thread has put up a bar for new requests.
586 * Continue immediately if no resync is active currently.
588 md_write_start(mddev
, bio
); /* wait on superblock update early */
590 spin_lock_irq(&conf
->resync_lock
);
591 wait_event_lock_irq(conf
->wait_resume
, !conf
->barrier
, conf
->resync_lock
, );
593 spin_unlock_irq(&conf
->resync_lock
);
595 if (bio_data_dir(bio
)==WRITE
) {
596 disk_stat_inc(mddev
->gendisk
, writes
);
597 disk_stat_add(mddev
->gendisk
, write_sectors
, bio_sectors(bio
));
599 disk_stat_inc(mddev
->gendisk
, reads
);
600 disk_stat_add(mddev
->gendisk
, read_sectors
, bio_sectors(bio
));
604 * make_request() can abort the operation when READA is being
605 * used and no empty request is available.
608 r1_bio
= mempool_alloc(conf
->r1bio_pool
, GFP_NOIO
);
610 r1_bio
->master_bio
= bio
;
611 r1_bio
->sectors
= bio
->bi_size
>> 9;
613 r1_bio
->mddev
= mddev
;
614 r1_bio
->sector
= bio
->bi_sector
;
618 if (bio_data_dir(bio
) == READ
) {
620 * read balancing logic:
622 int rdisk
= read_balance(conf
, r1_bio
);
625 /* couldn't find anywhere to read from */
626 raid_end_bio_io(r1_bio
);
629 mirror
= conf
->mirrors
+ rdisk
;
631 r1_bio
->read_disk
= rdisk
;
633 read_bio
= bio_clone(bio
, GFP_NOIO
);
635 r1_bio
->bios
[rdisk
] = read_bio
;
637 read_bio
->bi_sector
= r1_bio
->sector
+ mirror
->rdev
->data_offset
;
638 read_bio
->bi_bdev
= mirror
->rdev
->bdev
;
639 read_bio
->bi_end_io
= raid1_end_read_request
;
640 read_bio
->bi_rw
= READ
;
641 read_bio
->bi_private
= r1_bio
;
643 generic_make_request(read_bio
);
650 /* first select target devices under spinlock and
651 * inc refcount on their rdev. Record them by setting
654 disks
= conf
->raid_disks
;
656 { static int first
=1;
657 if (first
) printk("First Write sector %llu disks %d\n",
658 (unsigned long long)r1_bio
->sector
, disks
);
663 for (i
= 0; i
< disks
; i
++) {
664 if ((rdev
=conf
->mirrors
[i
].rdev
) != NULL
&&
666 atomic_inc(&rdev
->nr_pending
);
668 atomic_dec(&rdev
->nr_pending
);
669 r1_bio
->bios
[i
] = NULL
;
671 r1_bio
->bios
[i
] = bio
;
674 r1_bio
->bios
[i
] = NULL
;
678 if (targets
< conf
->raid_disks
) {
679 /* array is degraded, we will not clear the bitmap
680 * on I/O completion (see raid1_end_write_request) */
681 set_bit(R1BIO_Degraded
, &r1_bio
->state
);
684 atomic_set(&r1_bio
->remaining
, 0);
687 for (i
= 0; i
< disks
; i
++) {
689 if (!r1_bio
->bios
[i
])
692 mbio
= bio_clone(bio
, GFP_NOIO
);
693 r1_bio
->bios
[i
] = mbio
;
695 mbio
->bi_sector
= r1_bio
->sector
+ conf
->mirrors
[i
].rdev
->data_offset
;
696 mbio
->bi_bdev
= conf
->mirrors
[i
].rdev
->bdev
;
697 mbio
->bi_end_io
= raid1_end_write_request
;
699 mbio
->bi_private
= r1_bio
;
701 atomic_inc(&r1_bio
->remaining
);
703 bio_list_add(&bl
, mbio
);
706 bitmap_startwrite(bitmap
, bio
->bi_sector
, r1_bio
->sectors
);
707 spin_lock_irqsave(&conf
->device_lock
, flags
);
708 bio_list_merge(&conf
->pending_bio_list
, &bl
);
711 blk_plug_device(mddev
->queue
);
712 spin_unlock_irqrestore(&conf
->device_lock
, flags
);
715 while ((bio
= bio_list_pop(&bl
)) != NULL
)
716 generic_make_request(bio
);
722 static void status(struct seq_file
*seq
, mddev_t
*mddev
)
724 conf_t
*conf
= mddev_to_conf(mddev
);
727 seq_printf(seq
, " [%d/%d] [", conf
->raid_disks
,
728 conf
->working_disks
);
729 for (i
= 0; i
< conf
->raid_disks
; i
++)
730 seq_printf(seq
, "%s",
731 conf
->mirrors
[i
].rdev
&&
732 conf
->mirrors
[i
].rdev
->in_sync
? "U" : "_");
733 seq_printf(seq
, "]");
737 static void error(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
739 char b
[BDEVNAME_SIZE
];
740 conf_t
*conf
= mddev_to_conf(mddev
);
743 * If it is not operational, then we have already marked it as dead
744 * else if it is the last working disks, ignore the error, let the
745 * next level up know.
746 * else mark the drive as failed
749 && conf
->working_disks
== 1)
751 * Don't fail the drive, act as though we were just a
752 * normal single drive
757 conf
->working_disks
--;
759 * if recovery is running, make sure it aborts.
761 set_bit(MD_RECOVERY_ERR
, &mddev
->recovery
);
766 printk(KERN_ALERT
"raid1: Disk failure on %s, disabling device. \n"
767 " Operation continuing on %d devices\n",
768 bdevname(rdev
->bdev
,b
), conf
->working_disks
);
771 static void print_conf(conf_t
*conf
)
776 printk("RAID1 conf printout:\n");
781 printk(" --- wd:%d rd:%d\n", conf
->working_disks
,
784 for (i
= 0; i
< conf
->raid_disks
; i
++) {
785 char b
[BDEVNAME_SIZE
];
786 tmp
= conf
->mirrors
+ i
;
788 printk(" disk %d, wo:%d, o:%d, dev:%s\n",
789 i
, !tmp
->rdev
->in_sync
, !tmp
->rdev
->faulty
,
790 bdevname(tmp
->rdev
->bdev
,b
));
794 static void close_sync(conf_t
*conf
)
796 spin_lock_irq(&conf
->resync_lock
);
797 wait_event_lock_irq(conf
->wait_resume
, !conf
->barrier
,
798 conf
->resync_lock
, raid1_unplug(conf
->mddev
->queue
));
799 spin_unlock_irq(&conf
->resync_lock
);
801 if (conf
->barrier
) BUG();
802 if (waitqueue_active(&conf
->wait_idle
)) BUG();
804 mempool_destroy(conf
->r1buf_pool
);
805 conf
->r1buf_pool
= NULL
;
808 static int raid1_spare_active(mddev_t
*mddev
)
811 conf_t
*conf
= mddev
->private;
815 * Find all failed disks within the RAID1 configuration
816 * and mark them readable
818 for (i
= 0; i
< conf
->raid_disks
; i
++) {
819 tmp
= conf
->mirrors
+ i
;
821 && !tmp
->rdev
->faulty
822 && !tmp
->rdev
->in_sync
) {
823 conf
->working_disks
++;
825 tmp
->rdev
->in_sync
= 1;
834 static int raid1_add_disk(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
836 conf_t
*conf
= mddev
->private;
841 if (rdev
->saved_raid_disk
>= 0 &&
842 conf
->mirrors
[rdev
->saved_raid_disk
].rdev
== NULL
)
843 mirror
= rdev
->saved_raid_disk
;
844 for (mirror
=0; mirror
< mddev
->raid_disks
; mirror
++)
845 if ( !(p
=conf
->mirrors
+mirror
)->rdev
) {
847 blk_queue_stack_limits(mddev
->queue
,
848 rdev
->bdev
->bd_disk
->queue
);
849 /* as we don't honour merge_bvec_fn, we must never risk
850 * violating it, so limit ->max_sector to one PAGE, as
851 * a one page request is never in violation.
853 if (rdev
->bdev
->bd_disk
->queue
->merge_bvec_fn
&&
854 mddev
->queue
->max_sectors
> (PAGE_SIZE
>>9))
855 blk_queue_max_sectors(mddev
->queue
, PAGE_SIZE
>>9);
857 p
->head_position
= 0;
858 rdev
->raid_disk
= mirror
;
860 if (rdev
->saved_raid_disk
!= mirror
)
870 static int raid1_remove_disk(mddev_t
*mddev
, int number
)
872 conf_t
*conf
= mddev
->private;
875 mirror_info_t
*p
= conf
->mirrors
+ number
;
881 atomic_read(&rdev
->nr_pending
)) {
887 if (atomic_read(&rdev
->nr_pending
)) {
888 /* lost the race, try later */
900 static int end_sync_read(struct bio
*bio
, unsigned int bytes_done
, int error
)
902 int uptodate
= test_bit(BIO_UPTODATE
, &bio
->bi_flags
);
903 r1bio_t
* r1_bio
= (r1bio_t
*)(bio
->bi_private
);
904 conf_t
*conf
= mddev_to_conf(r1_bio
->mddev
);
909 if (r1_bio
->bios
[r1_bio
->read_disk
] != bio
)
911 update_head_pos(r1_bio
->read_disk
, r1_bio
);
913 * we have read a block, now it needs to be re-written,
914 * or re-read if the read failed.
915 * We don't do much here, just schedule handling by raid1d
918 md_error(r1_bio
->mddev
,
919 conf
->mirrors
[r1_bio
->read_disk
].rdev
);
921 set_bit(R1BIO_Uptodate
, &r1_bio
->state
);
922 rdev_dec_pending(conf
->mirrors
[r1_bio
->read_disk
].rdev
, conf
->mddev
);
923 reschedule_retry(r1_bio
);
927 static int end_sync_write(struct bio
*bio
, unsigned int bytes_done
, int error
)
929 int uptodate
= test_bit(BIO_UPTODATE
, &bio
->bi_flags
);
930 r1bio_t
* r1_bio
= (r1bio_t
*)(bio
->bi_private
);
931 mddev_t
*mddev
= r1_bio
->mddev
;
932 conf_t
*conf
= mddev_to_conf(mddev
);
939 for (i
= 0; i
< conf
->raid_disks
; i
++)
940 if (r1_bio
->bios
[i
] == bio
) {
945 md_error(mddev
, conf
->mirrors
[mirror
].rdev
);
947 update_head_pos(mirror
, r1_bio
);
949 if (atomic_dec_and_test(&r1_bio
->remaining
)) {
950 md_done_sync(mddev
, r1_bio
->sectors
, uptodate
);
953 rdev_dec_pending(conf
->mirrors
[mirror
].rdev
, mddev
);
957 static void sync_request_write(mddev_t
*mddev
, r1bio_t
*r1_bio
)
959 conf_t
*conf
= mddev_to_conf(mddev
);
961 int disks
= conf
->raid_disks
;
962 struct bio
*bio
, *wbio
;
964 bio
= r1_bio
->bios
[r1_bio
->read_disk
];
967 if (r1_bio->sector == 0) printk("First sync write startss\n");
972 if (!test_bit(R1BIO_Uptodate
, &r1_bio
->state
)) {
974 * There is no point trying a read-for-reconstruct as
975 * reconstruct is about to be aborted
977 char b
[BDEVNAME_SIZE
];
978 printk(KERN_ALERT
"raid1: %s: unrecoverable I/O read error"
980 bdevname(bio
->bi_bdev
,b
),
981 (unsigned long long)r1_bio
->sector
);
982 md_done_sync(mddev
, r1_bio
->sectors
, 0);
987 atomic_set(&r1_bio
->remaining
, 1);
988 for (i
= 0; i
< disks
; i
++) {
989 wbio
= r1_bio
->bios
[i
];
990 if (wbio
->bi_end_io
!= end_sync_write
)
993 atomic_inc(&conf
->mirrors
[i
].rdev
->nr_pending
);
994 atomic_inc(&r1_bio
->remaining
);
995 md_sync_acct(conf
->mirrors
[i
].rdev
->bdev
, wbio
->bi_size
>> 9);
997 generic_make_request(wbio
);
1000 if (atomic_dec_and_test(&r1_bio
->remaining
)) {
1001 /* if we're here, all write(s) have completed, so clean up */
1002 md_done_sync(mddev
, r1_bio
->sectors
, 1);
1008 * This is a kernel thread which:
1010 * 1. Retries failed read operations on working mirrors.
1011 * 2. Updates the raid superblock when problems encounter.
1012 * 3. Performs writes following reads for array syncronising.
1015 static void raid1d(mddev_t
*mddev
)
1019 unsigned long flags
;
1020 conf_t
*conf
= mddev_to_conf(mddev
);
1021 struct list_head
*head
= &conf
->retry_list
;
1025 md_check_recovery(mddev
);
1028 char b
[BDEVNAME_SIZE
];
1029 spin_lock_irqsave(&conf
->device_lock
, flags
);
1031 if (conf
->pending_bio_list
.head
) {
1032 bio
= bio_list_get(&conf
->pending_bio_list
);
1033 blk_remove_plug(mddev
->queue
);
1034 spin_unlock_irqrestore(&conf
->device_lock
, flags
);
1035 /* flush any pending bitmap writes to disk before proceeding w/ I/O */
1036 if (bitmap_unplug(mddev
->bitmap
) != 0)
1037 printk("%s: bitmap file write failed!\n", mdname(mddev
));
1039 while (bio
) { /* submit pending writes */
1040 struct bio
*next
= bio
->bi_next
;
1041 bio
->bi_next
= NULL
;
1042 generic_make_request(bio
);
1050 if (list_empty(head
))
1052 r1_bio
= list_entry(head
->prev
, r1bio_t
, retry_list
);
1053 list_del(head
->prev
);
1054 spin_unlock_irqrestore(&conf
->device_lock
, flags
);
1056 mddev
= r1_bio
->mddev
;
1057 conf
= mddev_to_conf(mddev
);
1058 if (test_bit(R1BIO_IsSync
, &r1_bio
->state
)) {
1059 sync_request_write(mddev
, r1_bio
);
1063 bio
= r1_bio
->bios
[r1_bio
->read_disk
];
1064 if ((disk
=read_balance(conf
, r1_bio
)) == -1) {
1065 printk(KERN_ALERT
"raid1: %s: unrecoverable I/O"
1066 " read error for block %llu\n",
1067 bdevname(bio
->bi_bdev
,b
),
1068 (unsigned long long)r1_bio
->sector
);
1069 raid_end_bio_io(r1_bio
);
1071 r1_bio
->bios
[r1_bio
->read_disk
] = NULL
;
1072 r1_bio
->read_disk
= disk
;
1074 bio
= bio_clone(r1_bio
->master_bio
, GFP_NOIO
);
1075 r1_bio
->bios
[r1_bio
->read_disk
] = bio
;
1076 rdev
= conf
->mirrors
[disk
].rdev
;
1077 if (printk_ratelimit())
1078 printk(KERN_ERR
"raid1: %s: redirecting sector %llu to"
1079 " another mirror\n",
1080 bdevname(rdev
->bdev
,b
),
1081 (unsigned long long)r1_bio
->sector
);
1082 bio
->bi_sector
= r1_bio
->sector
+ rdev
->data_offset
;
1083 bio
->bi_bdev
= rdev
->bdev
;
1084 bio
->bi_end_io
= raid1_end_read_request
;
1086 bio
->bi_private
= r1_bio
;
1088 generic_make_request(bio
);
1092 spin_unlock_irqrestore(&conf
->device_lock
, flags
);
1094 unplug_slaves(mddev
);
1098 static int init_resync(conf_t
*conf
)
1102 buffs
= RESYNC_WINDOW
/ RESYNC_BLOCK_SIZE
;
1103 if (conf
->r1buf_pool
)
1105 conf
->r1buf_pool
= mempool_create(buffs
, r1buf_pool_alloc
, r1buf_pool_free
,
1107 if (!conf
->r1buf_pool
)
1109 conf
->next_resync
= 0;
1114 * perform a "sync" on one "block"
1116 * We need to make sure that no normal I/O request - particularly write
1117 * requests - conflict with active sync requests.
1119 * This is achieved by tracking pending requests and a 'barrier' concept
1120 * that can be installed to exclude normal IO requests.
1123 static sector_t
sync_request(mddev_t
*mddev
, sector_t sector_nr
, int *skipped
, int go_faster
)
1125 conf_t
*conf
= mddev_to_conf(mddev
);
1126 mirror_info_t
*mirror
;
1129 sector_t max_sector
, nr_sectors
;
1133 int write_targets
= 0;
1135 int still_degraded
= 0;
1137 if (!conf
->r1buf_pool
)
1140 printk("sync start - bitmap %p\n", mddev->bitmap);
1142 if (init_resync(conf
))
1146 max_sector
= mddev
->size
<< 1;
1147 if (sector_nr
>= max_sector
) {
1148 /* If we aborted, we need to abort the
1149 * sync on the 'current' bitmap chunk (there will
1150 * only be one in raid1 resync.
1151 * We can find the current addess in mddev->curr_resync
1153 if (mddev
->curr_resync
< max_sector
) /* aborted */
1154 bitmap_end_sync(mddev
->bitmap
, mddev
->curr_resync
,
1156 else /* completed sync */
1159 bitmap_close_sync(mddev
->bitmap
);
1164 /* before building a request, check if we can skip these blocks..
1165 * This call the bitmap_start_sync doesn't actually record anything
1167 if (!bitmap_start_sync(mddev
->bitmap
, sector_nr
, &sync_blocks
, 1) &&
1169 /* We can skip this block, and probably several more */
1174 * If there is non-resync activity waiting for us then
1175 * put in a delay to throttle resync.
1177 if (!go_faster
&& waitqueue_active(&conf
->wait_resume
))
1178 msleep_interruptible(1000);
1179 device_barrier(conf
, sector_nr
+ RESYNC_SECTORS
);
1182 * If reconstructing, and >1 working disc,
1183 * could dedicate one to rebuild and others to
1184 * service read requests ..
1186 disk
= conf
->last_used
;
1187 /* make sure disk is operational */
1189 while (conf
->mirrors
[disk
].rdev
== NULL
||
1190 !conf
->mirrors
[disk
].rdev
->in_sync
||
1191 test_bit(WriteMostly
, &conf
->mirrors
[disk
].rdev
->flags
)
1193 if (conf
->mirrors
[disk
].rdev
&&
1194 conf
->mirrors
[disk
].rdev
->in_sync
)
1197 disk
= conf
->raid_disks
;
1199 if (disk
== conf
->last_used
) {
1204 conf
->last_used
= disk
;
1205 atomic_inc(&conf
->mirrors
[disk
].rdev
->nr_pending
);
1208 mirror
= conf
->mirrors
+ disk
;
1210 r1_bio
= mempool_alloc(conf
->r1buf_pool
, GFP_NOIO
);
1212 spin_lock_irq(&conf
->resync_lock
);
1214 spin_unlock_irq(&conf
->resync_lock
);
1216 r1_bio
->mddev
= mddev
;
1217 r1_bio
->sector
= sector_nr
;
1219 set_bit(R1BIO_IsSync
, &r1_bio
->state
);
1220 r1_bio
->read_disk
= disk
;
1222 for (i
=0; i
< conf
->raid_disks
; i
++) {
1223 bio
= r1_bio
->bios
[i
];
1225 /* take from bio_init */
1226 bio
->bi_next
= NULL
;
1227 bio
->bi_flags
|= 1 << BIO_UPTODATE
;
1231 bio
->bi_phys_segments
= 0;
1232 bio
->bi_hw_segments
= 0;
1234 bio
->bi_end_io
= NULL
;
1235 bio
->bi_private
= NULL
;
1239 bio
->bi_end_io
= end_sync_read
;
1240 } else if (conf
->mirrors
[i
].rdev
== NULL
||
1241 conf
->mirrors
[i
].rdev
->faulty
) {
1244 } else if (!conf
->mirrors
[i
].rdev
->in_sync
||
1245 sector_nr
+ RESYNC_SECTORS
> mddev
->recovery_cp
) {
1247 bio
->bi_end_io
= end_sync_write
;
1250 /* no need to read or write here */
1252 bio
->bi_sector
= sector_nr
+ conf
->mirrors
[i
].rdev
->data_offset
;
1253 bio
->bi_bdev
= conf
->mirrors
[i
].rdev
->bdev
;
1254 bio
->bi_private
= r1_bio
;
1257 if (write_targets
== 0) {
1258 /* There is nowhere to write, so all non-sync
1259 * drives must be failed - so we are finished
1261 sector_t rv
= max_sector
- sector_nr
;
1264 rdev_dec_pending(conf
->mirrors
[disk
].rdev
, mddev
);
1272 int len
= PAGE_SIZE
;
1273 if (sector_nr
+ (len
>>9) > max_sector
)
1274 len
= (max_sector
- sector_nr
) << 9;
1277 if (sync_blocks
== 0) {
1278 if (!bitmap_start_sync(mddev
->bitmap
, sector_nr
,
1279 &sync_blocks
, still_degraded
) &&
1282 if (sync_blocks
< (PAGE_SIZE
>>9))
1284 if (len
> (sync_blocks
<<9))
1285 len
= sync_blocks
<<9;
1288 for (i
=0 ; i
< conf
->raid_disks
; i
++) {
1289 bio
= r1_bio
->bios
[i
];
1290 if (bio
->bi_end_io
) {
1291 page
= r1_bio
->bios
[0]->bi_io_vec
[bio
->bi_vcnt
].bv_page
;
1292 if (bio_add_page(bio
, page
, len
, 0) == 0) {
1294 r1_bio
->bios
[0]->bi_io_vec
[bio
->bi_vcnt
].bv_page
= page
;
1297 bio
= r1_bio
->bios
[i
];
1298 if (bio
->bi_end_io
==NULL
)
1300 /* remove last page from this bio */
1302 bio
->bi_size
-= len
;
1303 bio
->bi_flags
&= ~(1<< BIO_SEG_VALID
);
1309 nr_sectors
+= len
>>9;
1310 sector_nr
+= len
>>9;
1311 sync_blocks
-= (len
>>9);
1312 } while (r1_bio
->bios
[disk
]->bi_vcnt
< RESYNC_PAGES
);
1314 bio
= r1_bio
->bios
[disk
];
1315 r1_bio
->sectors
= nr_sectors
;
1317 md_sync_acct(mirror
->rdev
->bdev
, nr_sectors
);
1319 generic_make_request(bio
);
1324 static int run(mddev_t
*mddev
)
1328 mirror_info_t
*disk
;
1330 struct list_head
*tmp
;
1332 if (mddev
->level
!= 1) {
1333 printk("raid1: %s: raid level not set to mirroring (%d)\n",
1334 mdname(mddev
), mddev
->level
);
1338 * copy the already verified devices into our private RAID1
1339 * bookkeeping area. [whatever we allocate in run(),
1340 * should be freed in stop()]
1342 conf
= kmalloc(sizeof(conf_t
), GFP_KERNEL
);
1343 mddev
->private = conf
;
1347 memset(conf
, 0, sizeof(*conf
));
1348 conf
->mirrors
= kmalloc(sizeof(struct mirror_info
)*mddev
->raid_disks
,
1353 memset(conf
->mirrors
, 0, sizeof(struct mirror_info
)*mddev
->raid_disks
);
1355 conf
->poolinfo
= kmalloc(sizeof(*conf
->poolinfo
), GFP_KERNEL
);
1356 if (!conf
->poolinfo
)
1358 conf
->poolinfo
->mddev
= mddev
;
1359 conf
->poolinfo
->raid_disks
= mddev
->raid_disks
;
1360 conf
->r1bio_pool
= mempool_create(NR_RAID1_BIOS
, r1bio_pool_alloc
,
1363 if (!conf
->r1bio_pool
)
1366 ITERATE_RDEV(mddev
, rdev
, tmp
) {
1367 disk_idx
= rdev
->raid_disk
;
1368 if (disk_idx
>= mddev
->raid_disks
1371 disk
= conf
->mirrors
+ disk_idx
;
1375 blk_queue_stack_limits(mddev
->queue
,
1376 rdev
->bdev
->bd_disk
->queue
);
1377 /* as we don't honour merge_bvec_fn, we must never risk
1378 * violating it, so limit ->max_sector to one PAGE, as
1379 * a one page request is never in violation.
1381 if (rdev
->bdev
->bd_disk
->queue
->merge_bvec_fn
&&
1382 mddev
->queue
->max_sectors
> (PAGE_SIZE
>>9))
1383 blk_queue_max_sectors(mddev
->queue
, PAGE_SIZE
>>9);
1385 disk
->head_position
= 0;
1386 if (!rdev
->faulty
&& rdev
->in_sync
)
1387 conf
->working_disks
++;
1389 conf
->raid_disks
= mddev
->raid_disks
;
1390 conf
->mddev
= mddev
;
1391 spin_lock_init(&conf
->device_lock
);
1392 INIT_LIST_HEAD(&conf
->retry_list
);
1393 if (conf
->working_disks
== 1)
1394 mddev
->recovery_cp
= MaxSector
;
1396 spin_lock_init(&conf
->resync_lock
);
1397 init_waitqueue_head(&conf
->wait_idle
);
1398 init_waitqueue_head(&conf
->wait_resume
);
1400 bio_list_init(&conf
->pending_bio_list
);
1401 bio_list_init(&conf
->flushing_bio_list
);
1403 if (!conf
->working_disks
) {
1404 printk(KERN_ERR
"raid1: no operational mirrors for %s\n",
1409 mddev
->degraded
= 0;
1410 for (i
= 0; i
< conf
->raid_disks
; i
++) {
1412 disk
= conf
->mirrors
+ i
;
1415 disk
->head_position
= 0;
1421 * find the first working one and use it as a starting point
1422 * to read balancing.
1424 for (j
= 0; j
< conf
->raid_disks
&&
1425 (!conf
->mirrors
[j
].rdev
||
1426 !conf
->mirrors
[j
].rdev
->in_sync
) ; j
++)
1428 conf
->last_used
= j
;
1431 mddev
->thread
= md_register_thread(raid1d
, mddev
, "%s_raid1");
1432 if (!mddev
->thread
) {
1434 "raid1: couldn't allocate thread for %s\n",
1438 if (mddev
->bitmap
) mddev
->thread
->timeout
= mddev
->bitmap
->daemon_sleep
* HZ
;
1441 "raid1: raid set %s active with %d out of %d mirrors\n",
1442 mdname(mddev
), mddev
->raid_disks
- mddev
->degraded
,
1445 * Ok, everything is just fine now
1447 mddev
->array_size
= mddev
->size
;
1449 mddev
->queue
->unplug_fn
= raid1_unplug
;
1450 mddev
->queue
->issue_flush_fn
= raid1_issue_flush
;
1455 printk(KERN_ERR
"raid1: couldn't allocate memory for %s\n",
1460 if (conf
->r1bio_pool
)
1461 mempool_destroy(conf
->r1bio_pool
);
1462 kfree(conf
->mirrors
);
1463 kfree(conf
->poolinfo
);
1465 mddev
->private = NULL
;
1471 static int stop(mddev_t
*mddev
)
1473 conf_t
*conf
= mddev_to_conf(mddev
);
1475 md_unregister_thread(mddev
->thread
);
1476 mddev
->thread
= NULL
;
1477 blk_sync_queue(mddev
->queue
); /* the unplug fn references 'conf'*/
1478 if (conf
->r1bio_pool
)
1479 mempool_destroy(conf
->r1bio_pool
);
1480 kfree(conf
->mirrors
);
1481 kfree(conf
->poolinfo
);
1483 mddev
->private = NULL
;
1487 static int raid1_resize(mddev_t
*mddev
, sector_t sectors
)
1489 /* no resync is happening, and there is enough space
1490 * on all devices, so we can resize.
1491 * We need to make sure resync covers any new space.
1492 * If the array is shrinking we should possibly wait until
1493 * any io in the removed space completes, but it hardly seems
1496 mddev
->array_size
= sectors
>>1;
1497 set_capacity(mddev
->gendisk
, mddev
->array_size
<< 1);
1499 if (mddev
->array_size
> mddev
->size
&& mddev
->recovery_cp
== MaxSector
) {
1500 mddev
->recovery_cp
= mddev
->size
<< 1;
1501 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
1503 mddev
->size
= mddev
->array_size
;
1504 mddev
->resync_max_sectors
= sectors
;
1508 static int raid1_reshape(mddev_t
*mddev
, int raid_disks
)
1511 * 1/ resize the r1bio_pool
1512 * 2/ resize conf->mirrors
1514 * We allocate a new r1bio_pool if we can.
1515 * Then raise a device barrier and wait until all IO stops.
1516 * Then resize conf->mirrors and swap in the new r1bio pool.
1518 * At the same time, we "pack" the devices so that all the missing
1519 * devices have the higher raid_disk numbers.
1521 mempool_t
*newpool
, *oldpool
;
1522 struct pool_info
*newpoolinfo
;
1523 mirror_info_t
*newmirrors
;
1524 conf_t
*conf
= mddev_to_conf(mddev
);
1529 if (raid_disks
< conf
->raid_disks
) {
1531 for (d
= 0; d
< conf
->raid_disks
; d
++)
1532 if (conf
->mirrors
[d
].rdev
)
1534 if (cnt
> raid_disks
)
1538 newpoolinfo
= kmalloc(sizeof(*newpoolinfo
), GFP_KERNEL
);
1541 newpoolinfo
->mddev
= mddev
;
1542 newpoolinfo
->raid_disks
= raid_disks
;
1544 newpool
= mempool_create(NR_RAID1_BIOS
, r1bio_pool_alloc
,
1545 r1bio_pool_free
, newpoolinfo
);
1550 newmirrors
= kmalloc(sizeof(struct mirror_info
) * raid_disks
, GFP_KERNEL
);
1553 mempool_destroy(newpool
);
1556 memset(newmirrors
, 0, sizeof(struct mirror_info
)*raid_disks
);
1558 spin_lock_irq(&conf
->resync_lock
);
1560 wait_event_lock_irq(conf
->wait_idle
, !conf
->nr_pending
,
1561 conf
->resync_lock
, raid1_unplug(mddev
->queue
));
1562 spin_unlock_irq(&conf
->resync_lock
);
1564 /* ok, everything is stopped */
1565 oldpool
= conf
->r1bio_pool
;
1566 conf
->r1bio_pool
= newpool
;
1568 for (d
=d2
=0; d
< conf
->raid_disks
; d
++)
1569 if (conf
->mirrors
[d
].rdev
) {
1570 conf
->mirrors
[d
].rdev
->raid_disk
= d2
;
1571 newmirrors
[d2
++].rdev
= conf
->mirrors
[d
].rdev
;
1573 kfree(conf
->mirrors
);
1574 conf
->mirrors
= newmirrors
;
1575 kfree(conf
->poolinfo
);
1576 conf
->poolinfo
= newpoolinfo
;
1578 mddev
->degraded
+= (raid_disks
- conf
->raid_disks
);
1579 conf
->raid_disks
= mddev
->raid_disks
= raid_disks
;
1581 conf
->last_used
= 0; /* just make sure it is in-range */
1582 spin_lock_irq(&conf
->resync_lock
);
1584 spin_unlock_irq(&conf
->resync_lock
);
1585 wake_up(&conf
->wait_resume
);
1586 wake_up(&conf
->wait_idle
);
1589 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
1590 md_wakeup_thread(mddev
->thread
);
1592 mempool_destroy(oldpool
);
1596 void raid1_quiesce(mddev_t
*mddev
, int state
)
1598 conf_t
*conf
= mddev_to_conf(mddev
);
1602 spin_lock_irq(&conf
->resync_lock
);
1604 wait_event_lock_irq(conf
->wait_idle
, !conf
->nr_pending
,
1605 conf
->resync_lock
, raid1_unplug(mddev
->queue
));
1606 spin_unlock_irq(&conf
->resync_lock
);
1609 spin_lock_irq(&conf
->resync_lock
);
1611 spin_unlock_irq(&conf
->resync_lock
);
1612 wake_up(&conf
->wait_resume
);
1613 wake_up(&conf
->wait_idle
);
1616 if (mddev
->thread
) {
1618 mddev
->thread
->timeout
= mddev
->bitmap
->daemon_sleep
* HZ
;
1620 mddev
->thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
1621 md_wakeup_thread(mddev
->thread
);
1626 static mdk_personality_t raid1_personality
=
1629 .owner
= THIS_MODULE
,
1630 .make_request
= make_request
,
1634 .error_handler
= error
,
1635 .hot_add_disk
= raid1_add_disk
,
1636 .hot_remove_disk
= raid1_remove_disk
,
1637 .spare_active
= raid1_spare_active
,
1638 .sync_request
= sync_request
,
1639 .resize
= raid1_resize
,
1640 .reshape
= raid1_reshape
,
1641 .quiesce
= raid1_quiesce
,
1644 static int __init
raid_init(void)
1646 return register_md_personality(RAID1
, &raid1_personality
);
1649 static void raid_exit(void)
1651 unregister_md_personality(RAID1
);
1654 module_init(raid_init
);
1655 module_exit(raid_exit
);
1656 MODULE_LICENSE("GPL");
1657 MODULE_ALIAS("md-personality-3"); /* RAID1 */