2 md.c : Multiple Devices driver for Linux
3 Copyright (C) 1998, 1999, 2000 Ingo Molnar
5 completely rewritten, based on the MD driver code from Marc Zyngier
9 - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar
10 - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com>
11 - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net>
12 - kerneld support by Boris Tobotras <boris@xtalk.msk.su>
13 - kmod support by: Cyrus Durgin
14 - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com>
15 - Devfs support by Richard Gooch <rgooch@atnf.csiro.au>
17 - lots of fixes and improvements to the RAID1/RAID5 and generic
18 RAID code (such as request based resynchronization):
20 Neil Brown <neilb@cse.unsw.edu.au>.
22 - persistent bitmap code
23 Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.
25 This program is free software; you can redistribute it and/or modify
26 it under the terms of the GNU General Public License as published by
27 the Free Software Foundation; either version 2, or (at your option)
30 You should have received a copy of the GNU General Public License
31 (for example /usr/src/linux/COPYING); if not, write to the Free
32 Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
35 #include <linux/kthread.h>
36 #include <linux/blkdev.h>
37 #include <linux/sysctl.h>
38 #include <linux/seq_file.h>
40 #include <linux/poll.h>
41 #include <linux/ctype.h>
42 #include <linux/string.h>
43 #include <linux/hdreg.h>
44 #include <linux/proc_fs.h>
45 #include <linux/random.h>
46 #include <linux/module.h>
47 #include <linux/reboot.h>
48 #include <linux/file.h>
49 #include <linux/compat.h>
50 #include <linux/delay.h>
51 #include <linux/raid/md_p.h>
52 #include <linux/raid/md_u.h>
53 #include <linux/slab.h>
56 #include "md-cluster.h"
59 static void autostart_arrays(int part
);
62 /* pers_list is a list of registered personalities protected
64 * pers_lock does extra service to protect accesses to
65 * mddev->thread when the mutex cannot be held.
67 static LIST_HEAD(pers_list
);
68 static DEFINE_SPINLOCK(pers_lock
);
70 struct md_cluster_operations
*md_cluster_ops
;
71 EXPORT_SYMBOL(md_cluster_ops
);
72 struct module
*md_cluster_mod
;
73 EXPORT_SYMBOL(md_cluster_mod
);
75 static DECLARE_WAIT_QUEUE_HEAD(resync_wait
);
76 static struct workqueue_struct
*md_wq
;
77 static struct workqueue_struct
*md_misc_wq
;
79 static int remove_and_add_spares(struct mddev
*mddev
,
80 struct md_rdev
*this);
81 static void mddev_detach(struct mddev
*mddev
);
84 * Default number of read corrections we'll attempt on an rdev
85 * before ejecting it from the array. We divide the read error
86 * count by 2 for every hour elapsed between read errors.
88 #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
90 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
91 * is 1000 KB/sec, so the extra system load does not show up that much.
92 * Increase it if you want to have more _guaranteed_ speed. Note that
93 * the RAID driver will use the maximum available bandwidth if the IO
94 * subsystem is idle. There is also an 'absolute maximum' reconstruction
95 * speed limit - in case reconstruction slows down your system despite
98 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
99 * or /sys/block/mdX/md/sync_speed_{min,max}
102 static int sysctl_speed_limit_min
= 1000;
103 static int sysctl_speed_limit_max
= 200000;
104 static inline int speed_min(struct mddev
*mddev
)
106 return mddev
->sync_speed_min
?
107 mddev
->sync_speed_min
: sysctl_speed_limit_min
;
110 static inline int speed_max(struct mddev
*mddev
)
112 return mddev
->sync_speed_max
?
113 mddev
->sync_speed_max
: sysctl_speed_limit_max
;
116 static struct ctl_table_header
*raid_table_header
;
118 static struct ctl_table raid_table
[] = {
120 .procname
= "speed_limit_min",
121 .data
= &sysctl_speed_limit_min
,
122 .maxlen
= sizeof(int),
123 .mode
= S_IRUGO
|S_IWUSR
,
124 .proc_handler
= proc_dointvec
,
127 .procname
= "speed_limit_max",
128 .data
= &sysctl_speed_limit_max
,
129 .maxlen
= sizeof(int),
130 .mode
= S_IRUGO
|S_IWUSR
,
131 .proc_handler
= proc_dointvec
,
136 static struct ctl_table raid_dir_table
[] = {
140 .mode
= S_IRUGO
|S_IXUGO
,
146 static struct ctl_table raid_root_table
[] = {
151 .child
= raid_dir_table
,
156 static const struct block_device_operations md_fops
;
158 static int start_readonly
;
161 * like bio_clone, but with a local bio set
164 struct bio
*bio_alloc_mddev(gfp_t gfp_mask
, int nr_iovecs
,
169 if (!mddev
|| !mddev
->bio_set
)
170 return bio_alloc(gfp_mask
, nr_iovecs
);
172 b
= bio_alloc_bioset(gfp_mask
, nr_iovecs
, mddev
->bio_set
);
177 EXPORT_SYMBOL_GPL(bio_alloc_mddev
);
179 struct bio
*bio_clone_mddev(struct bio
*bio
, gfp_t gfp_mask
,
182 if (!mddev
|| !mddev
->bio_set
)
183 return bio_clone(bio
, gfp_mask
);
185 return bio_clone_bioset(bio
, gfp_mask
, mddev
->bio_set
);
187 EXPORT_SYMBOL_GPL(bio_clone_mddev
);
190 * We have a system wide 'event count' that is incremented
191 * on any 'interesting' event, and readers of /proc/mdstat
192 * can use 'poll' or 'select' to find out when the event
196 * start array, stop array, error, add device, remove device,
197 * start build, activate spare
199 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters
);
200 static atomic_t md_event_count
;
201 void md_new_event(struct mddev
*mddev
)
203 atomic_inc(&md_event_count
);
204 wake_up(&md_event_waiters
);
206 EXPORT_SYMBOL_GPL(md_new_event
);
208 /* Alternate version that can be called from interrupts
209 * when calling sysfs_notify isn't needed.
211 static void md_new_event_inintr(struct mddev
*mddev
)
213 atomic_inc(&md_event_count
);
214 wake_up(&md_event_waiters
);
218 * Enables to iterate over all existing md arrays
219 * all_mddevs_lock protects this list.
221 static LIST_HEAD(all_mddevs
);
222 static DEFINE_SPINLOCK(all_mddevs_lock
);
225 * iterates through all used mddevs in the system.
226 * We take care to grab the all_mddevs_lock whenever navigating
227 * the list, and to always hold a refcount when unlocked.
228 * Any code which breaks out of this loop while own
229 * a reference to the current mddev and must mddev_put it.
231 #define for_each_mddev(_mddev,_tmp) \
233 for (({ spin_lock(&all_mddevs_lock); \
234 _tmp = all_mddevs.next; \
236 ({ if (_tmp != &all_mddevs) \
237 mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\
238 spin_unlock(&all_mddevs_lock); \
239 if (_mddev) mddev_put(_mddev); \
240 _mddev = list_entry(_tmp, struct mddev, all_mddevs); \
241 _tmp != &all_mddevs;}); \
242 ({ spin_lock(&all_mddevs_lock); \
243 _tmp = _tmp->next;}) \
246 /* Rather than calling directly into the personality make_request function,
247 * IO requests come here first so that we can check if the device is
248 * being suspended pending a reconfiguration.
249 * We hold a refcount over the call to ->make_request. By the time that
250 * call has finished, the bio has been linked into some internal structure
251 * and so is visible to ->quiesce(), so we don't need the refcount any more.
253 static void md_make_request(struct request_queue
*q
, struct bio
*bio
)
255 const int rw
= bio_data_dir(bio
);
256 struct mddev
*mddev
= q
->queuedata
;
257 unsigned int sectors
;
260 blk_queue_split(q
, &bio
, q
->bio_split
);
262 if (mddev
== NULL
|| mddev
->pers
== NULL
267 if (mddev
->ro
== 1 && unlikely(rw
== WRITE
)) {
268 if (bio_sectors(bio
) != 0)
269 bio
->bi_error
= -EROFS
;
273 smp_rmb(); /* Ensure implications of 'active' are visible */
275 if (mddev
->suspended
) {
278 prepare_to_wait(&mddev
->sb_wait
, &__wait
,
279 TASK_UNINTERRUPTIBLE
);
280 if (!mddev
->suspended
)
286 finish_wait(&mddev
->sb_wait
, &__wait
);
288 atomic_inc(&mddev
->active_io
);
292 * save the sectors now since our bio can
293 * go away inside make_request
295 sectors
= bio_sectors(bio
);
296 mddev
->pers
->make_request(mddev
, bio
);
298 cpu
= part_stat_lock();
299 part_stat_inc(cpu
, &mddev
->gendisk
->part0
, ios
[rw
]);
300 part_stat_add(cpu
, &mddev
->gendisk
->part0
, sectors
[rw
], sectors
);
303 if (atomic_dec_and_test(&mddev
->active_io
) && mddev
->suspended
)
304 wake_up(&mddev
->sb_wait
);
307 /* mddev_suspend makes sure no new requests are submitted
308 * to the device, and that any requests that have been submitted
309 * are completely handled.
310 * Once mddev_detach() is called and completes, the module will be
313 void mddev_suspend(struct mddev
*mddev
)
315 BUG_ON(mddev
->suspended
);
316 mddev
->suspended
= 1;
318 wait_event(mddev
->sb_wait
, atomic_read(&mddev
->active_io
) == 0);
319 mddev
->pers
->quiesce(mddev
, 1);
321 del_timer_sync(&mddev
->safemode_timer
);
323 EXPORT_SYMBOL_GPL(mddev_suspend
);
325 void mddev_resume(struct mddev
*mddev
)
327 mddev
->suspended
= 0;
328 wake_up(&mddev
->sb_wait
);
329 mddev
->pers
->quiesce(mddev
, 0);
331 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
332 md_wakeup_thread(mddev
->thread
);
333 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
335 EXPORT_SYMBOL_GPL(mddev_resume
);
337 int mddev_congested(struct mddev
*mddev
, int bits
)
339 struct md_personality
*pers
= mddev
->pers
;
343 if (mddev
->suspended
)
345 else if (pers
&& pers
->congested
)
346 ret
= pers
->congested(mddev
, bits
);
350 EXPORT_SYMBOL_GPL(mddev_congested
);
351 static int md_congested(void *data
, int bits
)
353 struct mddev
*mddev
= data
;
354 return mddev_congested(mddev
, bits
);
358 * Generic flush handling for md
361 static void md_end_flush(struct bio
*bio
)
363 struct md_rdev
*rdev
= bio
->bi_private
;
364 struct mddev
*mddev
= rdev
->mddev
;
366 rdev_dec_pending(rdev
, mddev
);
368 if (atomic_dec_and_test(&mddev
->flush_pending
)) {
369 /* The pre-request flush has finished */
370 queue_work(md_wq
, &mddev
->flush_work
);
375 static void md_submit_flush_data(struct work_struct
*ws
);
377 static void submit_flushes(struct work_struct
*ws
)
379 struct mddev
*mddev
= container_of(ws
, struct mddev
, flush_work
);
380 struct md_rdev
*rdev
;
382 INIT_WORK(&mddev
->flush_work
, md_submit_flush_data
);
383 atomic_set(&mddev
->flush_pending
, 1);
385 rdev_for_each_rcu(rdev
, mddev
)
386 if (rdev
->raid_disk
>= 0 &&
387 !test_bit(Faulty
, &rdev
->flags
)) {
388 /* Take two references, one is dropped
389 * when request finishes, one after
390 * we reclaim rcu_read_lock
393 atomic_inc(&rdev
->nr_pending
);
394 atomic_inc(&rdev
->nr_pending
);
396 bi
= bio_alloc_mddev(GFP_NOIO
, 0, mddev
);
397 bi
->bi_end_io
= md_end_flush
;
398 bi
->bi_private
= rdev
;
399 bi
->bi_bdev
= rdev
->bdev
;
400 atomic_inc(&mddev
->flush_pending
);
401 submit_bio(WRITE_FLUSH
, bi
);
403 rdev_dec_pending(rdev
, mddev
);
406 if (atomic_dec_and_test(&mddev
->flush_pending
))
407 queue_work(md_wq
, &mddev
->flush_work
);
410 static void md_submit_flush_data(struct work_struct
*ws
)
412 struct mddev
*mddev
= container_of(ws
, struct mddev
, flush_work
);
413 struct bio
*bio
= mddev
->flush_bio
;
415 if (bio
->bi_iter
.bi_size
== 0)
416 /* an empty barrier - all done */
419 bio
->bi_rw
&= ~REQ_FLUSH
;
420 mddev
->pers
->make_request(mddev
, bio
);
423 mddev
->flush_bio
= NULL
;
424 wake_up(&mddev
->sb_wait
);
427 void md_flush_request(struct mddev
*mddev
, struct bio
*bio
)
429 spin_lock_irq(&mddev
->lock
);
430 wait_event_lock_irq(mddev
->sb_wait
,
433 mddev
->flush_bio
= bio
;
434 spin_unlock_irq(&mddev
->lock
);
436 INIT_WORK(&mddev
->flush_work
, submit_flushes
);
437 queue_work(md_wq
, &mddev
->flush_work
);
439 EXPORT_SYMBOL(md_flush_request
);
441 void md_unplug(struct blk_plug_cb
*cb
, bool from_schedule
)
443 struct mddev
*mddev
= cb
->data
;
444 md_wakeup_thread(mddev
->thread
);
447 EXPORT_SYMBOL(md_unplug
);
449 static inline struct mddev
*mddev_get(struct mddev
*mddev
)
451 atomic_inc(&mddev
->active
);
455 static void mddev_delayed_delete(struct work_struct
*ws
);
457 static void mddev_put(struct mddev
*mddev
)
459 struct bio_set
*bs
= NULL
;
461 if (!atomic_dec_and_lock(&mddev
->active
, &all_mddevs_lock
))
463 if (!mddev
->raid_disks
&& list_empty(&mddev
->disks
) &&
464 mddev
->ctime
== 0 && !mddev
->hold_active
) {
465 /* Array is not configured at all, and not held active,
467 list_del_init(&mddev
->all_mddevs
);
469 mddev
->bio_set
= NULL
;
470 if (mddev
->gendisk
) {
471 /* We did a probe so need to clean up. Call
472 * queue_work inside the spinlock so that
473 * flush_workqueue() after mddev_find will
474 * succeed in waiting for the work to be done.
476 INIT_WORK(&mddev
->del_work
, mddev_delayed_delete
);
477 queue_work(md_misc_wq
, &mddev
->del_work
);
481 spin_unlock(&all_mddevs_lock
);
486 static void md_safemode_timeout(unsigned long data
);
488 void mddev_init(struct mddev
*mddev
)
490 mutex_init(&mddev
->open_mutex
);
491 mutex_init(&mddev
->reconfig_mutex
);
492 mutex_init(&mddev
->bitmap_info
.mutex
);
493 INIT_LIST_HEAD(&mddev
->disks
);
494 INIT_LIST_HEAD(&mddev
->all_mddevs
);
495 setup_timer(&mddev
->safemode_timer
, md_safemode_timeout
,
496 (unsigned long) mddev
);
497 atomic_set(&mddev
->active
, 1);
498 atomic_set(&mddev
->openers
, 0);
499 atomic_set(&mddev
->active_io
, 0);
500 spin_lock_init(&mddev
->lock
);
501 atomic_set(&mddev
->flush_pending
, 0);
502 init_waitqueue_head(&mddev
->sb_wait
);
503 init_waitqueue_head(&mddev
->recovery_wait
);
504 mddev
->reshape_position
= MaxSector
;
505 mddev
->reshape_backwards
= 0;
506 mddev
->last_sync_action
= "none";
507 mddev
->resync_min
= 0;
508 mddev
->resync_max
= MaxSector
;
509 mddev
->level
= LEVEL_NONE
;
511 EXPORT_SYMBOL_GPL(mddev_init
);
513 static struct mddev
*mddev_find(dev_t unit
)
515 struct mddev
*mddev
, *new = NULL
;
517 if (unit
&& MAJOR(unit
) != MD_MAJOR
)
518 unit
&= ~((1<<MdpMinorShift
)-1);
521 spin_lock(&all_mddevs_lock
);
524 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
525 if (mddev
->unit
== unit
) {
527 spin_unlock(&all_mddevs_lock
);
533 list_add(&new->all_mddevs
, &all_mddevs
);
534 spin_unlock(&all_mddevs_lock
);
535 new->hold_active
= UNTIL_IOCTL
;
539 /* find an unused unit number */
540 static int next_minor
= 512;
541 int start
= next_minor
;
545 dev
= MKDEV(MD_MAJOR
, next_minor
);
547 if (next_minor
> MINORMASK
)
549 if (next_minor
== start
) {
550 /* Oh dear, all in use. */
551 spin_unlock(&all_mddevs_lock
);
557 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
558 if (mddev
->unit
== dev
) {
564 new->md_minor
= MINOR(dev
);
565 new->hold_active
= UNTIL_STOP
;
566 list_add(&new->all_mddevs
, &all_mddevs
);
567 spin_unlock(&all_mddevs_lock
);
570 spin_unlock(&all_mddevs_lock
);
572 new = kzalloc(sizeof(*new), GFP_KERNEL
);
577 if (MAJOR(unit
) == MD_MAJOR
)
578 new->md_minor
= MINOR(unit
);
580 new->md_minor
= MINOR(unit
) >> MdpMinorShift
;
587 static struct attribute_group md_redundancy_group
;
589 void mddev_unlock(struct mddev
*mddev
)
591 if (mddev
->to_remove
) {
592 /* These cannot be removed under reconfig_mutex as
593 * an access to the files will try to take reconfig_mutex
594 * while holding the file unremovable, which leads to
596 * So hold set sysfs_active while the remove in happeing,
597 * and anything else which might set ->to_remove or my
598 * otherwise change the sysfs namespace will fail with
599 * -EBUSY if sysfs_active is still set.
600 * We set sysfs_active under reconfig_mutex and elsewhere
601 * test it under the same mutex to ensure its correct value
604 struct attribute_group
*to_remove
= mddev
->to_remove
;
605 mddev
->to_remove
= NULL
;
606 mddev
->sysfs_active
= 1;
607 mutex_unlock(&mddev
->reconfig_mutex
);
609 if (mddev
->kobj
.sd
) {
610 if (to_remove
!= &md_redundancy_group
)
611 sysfs_remove_group(&mddev
->kobj
, to_remove
);
612 if (mddev
->pers
== NULL
||
613 mddev
->pers
->sync_request
== NULL
) {
614 sysfs_remove_group(&mddev
->kobj
, &md_redundancy_group
);
615 if (mddev
->sysfs_action
)
616 sysfs_put(mddev
->sysfs_action
);
617 mddev
->sysfs_action
= NULL
;
620 mddev
->sysfs_active
= 0;
622 mutex_unlock(&mddev
->reconfig_mutex
);
624 /* As we've dropped the mutex we need a spinlock to
625 * make sure the thread doesn't disappear
627 spin_lock(&pers_lock
);
628 md_wakeup_thread(mddev
->thread
);
629 spin_unlock(&pers_lock
);
631 EXPORT_SYMBOL_GPL(mddev_unlock
);
633 struct md_rdev
*md_find_rdev_nr_rcu(struct mddev
*mddev
, int nr
)
635 struct md_rdev
*rdev
;
637 rdev_for_each_rcu(rdev
, mddev
)
638 if (rdev
->desc_nr
== nr
)
643 EXPORT_SYMBOL_GPL(md_find_rdev_nr_rcu
);
645 static struct md_rdev
*find_rdev(struct mddev
*mddev
, dev_t dev
)
647 struct md_rdev
*rdev
;
649 rdev_for_each(rdev
, mddev
)
650 if (rdev
->bdev
->bd_dev
== dev
)
656 static struct md_rdev
*find_rdev_rcu(struct mddev
*mddev
, dev_t dev
)
658 struct md_rdev
*rdev
;
660 rdev_for_each_rcu(rdev
, mddev
)
661 if (rdev
->bdev
->bd_dev
== dev
)
667 static struct md_personality
*find_pers(int level
, char *clevel
)
669 struct md_personality
*pers
;
670 list_for_each_entry(pers
, &pers_list
, list
) {
671 if (level
!= LEVEL_NONE
&& pers
->level
== level
)
673 if (strcmp(pers
->name
, clevel
)==0)
679 /* return the offset of the super block in 512byte sectors */
680 static inline sector_t
calc_dev_sboffset(struct md_rdev
*rdev
)
682 sector_t num_sectors
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
683 return MD_NEW_SIZE_SECTORS(num_sectors
);
686 static int alloc_disk_sb(struct md_rdev
*rdev
)
688 rdev
->sb_page
= alloc_page(GFP_KERNEL
);
689 if (!rdev
->sb_page
) {
690 printk(KERN_ALERT
"md: out of memory.\n");
697 void md_rdev_clear(struct md_rdev
*rdev
)
700 put_page(rdev
->sb_page
);
702 rdev
->sb_page
= NULL
;
707 put_page(rdev
->bb_page
);
708 rdev
->bb_page
= NULL
;
710 kfree(rdev
->badblocks
.page
);
711 rdev
->badblocks
.page
= NULL
;
713 EXPORT_SYMBOL_GPL(md_rdev_clear
);
715 static void super_written(struct bio
*bio
)
717 struct md_rdev
*rdev
= bio
->bi_private
;
718 struct mddev
*mddev
= rdev
->mddev
;
721 printk("md: super_written gets error=%d\n", bio
->bi_error
);
722 md_error(mddev
, rdev
);
725 if (atomic_dec_and_test(&mddev
->pending_writes
))
726 wake_up(&mddev
->sb_wait
);
730 void md_super_write(struct mddev
*mddev
, struct md_rdev
*rdev
,
731 sector_t sector
, int size
, struct page
*page
)
733 /* write first size bytes of page to sector of rdev
734 * Increment mddev->pending_writes before returning
735 * and decrement it on completion, waking up sb_wait
736 * if zero is reached.
737 * If an error occurred, call md_error
739 struct bio
*bio
= bio_alloc_mddev(GFP_NOIO
, 1, mddev
);
741 bio
->bi_bdev
= rdev
->meta_bdev
? rdev
->meta_bdev
: rdev
->bdev
;
742 bio
->bi_iter
.bi_sector
= sector
;
743 bio_add_page(bio
, page
, size
, 0);
744 bio
->bi_private
= rdev
;
745 bio
->bi_end_io
= super_written
;
747 atomic_inc(&mddev
->pending_writes
);
748 submit_bio(WRITE_FLUSH_FUA
, bio
);
751 void md_super_wait(struct mddev
*mddev
)
753 /* wait for all superblock writes that were scheduled to complete */
754 wait_event(mddev
->sb_wait
, atomic_read(&mddev
->pending_writes
)==0);
757 int sync_page_io(struct md_rdev
*rdev
, sector_t sector
, int size
,
758 struct page
*page
, int rw
, bool metadata_op
)
760 struct bio
*bio
= bio_alloc_mddev(GFP_NOIO
, 1, rdev
->mddev
);
763 bio
->bi_bdev
= (metadata_op
&& rdev
->meta_bdev
) ?
764 rdev
->meta_bdev
: rdev
->bdev
;
766 bio
->bi_iter
.bi_sector
= sector
+ rdev
->sb_start
;
767 else if (rdev
->mddev
->reshape_position
!= MaxSector
&&
768 (rdev
->mddev
->reshape_backwards
==
769 (sector
>= rdev
->mddev
->reshape_position
)))
770 bio
->bi_iter
.bi_sector
= sector
+ rdev
->new_data_offset
;
772 bio
->bi_iter
.bi_sector
= sector
+ rdev
->data_offset
;
773 bio_add_page(bio
, page
, size
, 0);
774 submit_bio_wait(rw
, bio
);
776 ret
= !bio
->bi_error
;
780 EXPORT_SYMBOL_GPL(sync_page_io
);
782 static int read_disk_sb(struct md_rdev
*rdev
, int size
)
784 char b
[BDEVNAME_SIZE
];
789 if (!sync_page_io(rdev
, 0, size
, rdev
->sb_page
, READ
, true))
795 printk(KERN_WARNING
"md: disabled device %s, could not read superblock.\n",
796 bdevname(rdev
->bdev
,b
));
800 static int uuid_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
802 return sb1
->set_uuid0
== sb2
->set_uuid0
&&
803 sb1
->set_uuid1
== sb2
->set_uuid1
&&
804 sb1
->set_uuid2
== sb2
->set_uuid2
&&
805 sb1
->set_uuid3
== sb2
->set_uuid3
;
808 static int sb_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
811 mdp_super_t
*tmp1
, *tmp2
;
813 tmp1
= kmalloc(sizeof(*tmp1
),GFP_KERNEL
);
814 tmp2
= kmalloc(sizeof(*tmp2
),GFP_KERNEL
);
816 if (!tmp1
|| !tmp2
) {
818 printk(KERN_INFO
"md.c sb_equal(): failed to allocate memory!\n");
826 * nr_disks is not constant
831 ret
= (memcmp(tmp1
, tmp2
, MD_SB_GENERIC_CONSTANT_WORDS
* 4) == 0);
838 static u32
md_csum_fold(u32 csum
)
840 csum
= (csum
& 0xffff) + (csum
>> 16);
841 return (csum
& 0xffff) + (csum
>> 16);
844 static unsigned int calc_sb_csum(mdp_super_t
*sb
)
847 u32
*sb32
= (u32
*)sb
;
849 unsigned int disk_csum
, csum
;
851 disk_csum
= sb
->sb_csum
;
854 for (i
= 0; i
< MD_SB_BYTES
/4 ; i
++)
856 csum
= (newcsum
& 0xffffffff) + (newcsum
>>32);
859 /* This used to use csum_partial, which was wrong for several
860 * reasons including that different results are returned on
861 * different architectures. It isn't critical that we get exactly
862 * the same return value as before (we always csum_fold before
863 * testing, and that removes any differences). However as we
864 * know that csum_partial always returned a 16bit value on
865 * alphas, do a fold to maximise conformity to previous behaviour.
867 sb
->sb_csum
= md_csum_fold(disk_csum
);
869 sb
->sb_csum
= disk_csum
;
875 * Handle superblock details.
876 * We want to be able to handle multiple superblock formats
877 * so we have a common interface to them all, and an array of
878 * different handlers.
879 * We rely on user-space to write the initial superblock, and support
880 * reading and updating of superblocks.
881 * Interface methods are:
882 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version)
883 * loads and validates a superblock on dev.
884 * if refdev != NULL, compare superblocks on both devices
886 * 0 - dev has a superblock that is compatible with refdev
887 * 1 - dev has a superblock that is compatible and newer than refdev
888 * so dev should be used as the refdev in future
889 * -EINVAL superblock incompatible or invalid
890 * -othererror e.g. -EIO
892 * int validate_super(struct mddev *mddev, struct md_rdev *dev)
893 * Verify that dev is acceptable into mddev.
894 * The first time, mddev->raid_disks will be 0, and data from
895 * dev should be merged in. Subsequent calls check that dev
896 * is new enough. Return 0 or -EINVAL
898 * void sync_super(struct mddev *mddev, struct md_rdev *dev)
899 * Update the superblock for rdev with data in mddev
900 * This does not write to disc.
906 struct module
*owner
;
907 int (*load_super
)(struct md_rdev
*rdev
,
908 struct md_rdev
*refdev
,
910 int (*validate_super
)(struct mddev
*mddev
,
911 struct md_rdev
*rdev
);
912 void (*sync_super
)(struct mddev
*mddev
,
913 struct md_rdev
*rdev
);
914 unsigned long long (*rdev_size_change
)(struct md_rdev
*rdev
,
915 sector_t num_sectors
);
916 int (*allow_new_offset
)(struct md_rdev
*rdev
,
917 unsigned long long new_offset
);
921 * Check that the given mddev has no bitmap.
923 * This function is called from the run method of all personalities that do not
924 * support bitmaps. It prints an error message and returns non-zero if mddev
925 * has a bitmap. Otherwise, it returns 0.
928 int md_check_no_bitmap(struct mddev
*mddev
)
930 if (!mddev
->bitmap_info
.file
&& !mddev
->bitmap_info
.offset
)
932 printk(KERN_ERR
"%s: bitmaps are not supported for %s\n",
933 mdname(mddev
), mddev
->pers
->name
);
936 EXPORT_SYMBOL(md_check_no_bitmap
);
939 * load_super for 0.90.0
941 static int super_90_load(struct md_rdev
*rdev
, struct md_rdev
*refdev
, int minor_version
)
943 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
948 * Calculate the position of the superblock (512byte sectors),
949 * it's at the end of the disk.
951 * It also happens to be a multiple of 4Kb.
953 rdev
->sb_start
= calc_dev_sboffset(rdev
);
955 ret
= read_disk_sb(rdev
, MD_SB_BYTES
);
960 bdevname(rdev
->bdev
, b
);
961 sb
= page_address(rdev
->sb_page
);
963 if (sb
->md_magic
!= MD_SB_MAGIC
) {
964 printk(KERN_ERR
"md: invalid raid superblock magic on %s\n",
969 if (sb
->major_version
!= 0 ||
970 sb
->minor_version
< 90 ||
971 sb
->minor_version
> 91) {
972 printk(KERN_WARNING
"Bad version number %d.%d on %s\n",
973 sb
->major_version
, sb
->minor_version
,
978 if (sb
->raid_disks
<= 0)
981 if (md_csum_fold(calc_sb_csum(sb
)) != md_csum_fold(sb
->sb_csum
)) {
982 printk(KERN_WARNING
"md: invalid superblock checksum on %s\n",
987 rdev
->preferred_minor
= sb
->md_minor
;
988 rdev
->data_offset
= 0;
989 rdev
->new_data_offset
= 0;
990 rdev
->sb_size
= MD_SB_BYTES
;
991 rdev
->badblocks
.shift
= -1;
993 if (sb
->level
== LEVEL_MULTIPATH
)
996 rdev
->desc_nr
= sb
->this_disk
.number
;
1002 mdp_super_t
*refsb
= page_address(refdev
->sb_page
);
1003 if (!uuid_equal(refsb
, sb
)) {
1004 printk(KERN_WARNING
"md: %s has different UUID to %s\n",
1005 b
, bdevname(refdev
->bdev
,b2
));
1008 if (!sb_equal(refsb
, sb
)) {
1009 printk(KERN_WARNING
"md: %s has same UUID"
1010 " but different superblock to %s\n",
1011 b
, bdevname(refdev
->bdev
, b2
));
1015 ev2
= md_event(refsb
);
1021 rdev
->sectors
= rdev
->sb_start
;
1022 /* Limit to 4TB as metadata cannot record more than that.
1023 * (not needed for Linear and RAID0 as metadata doesn't
1026 if (rdev
->sectors
>= (2ULL << 32) && sb
->level
>= 1)
1027 rdev
->sectors
= (2ULL << 32) - 2;
1029 if (rdev
->sectors
< ((sector_t
)sb
->size
) * 2 && sb
->level
>= 1)
1030 /* "this cannot possibly happen" ... */
1038 * validate_super for 0.90.0
1040 static int super_90_validate(struct mddev
*mddev
, struct md_rdev
*rdev
)
1043 mdp_super_t
*sb
= page_address(rdev
->sb_page
);
1044 __u64 ev1
= md_event(sb
);
1046 rdev
->raid_disk
= -1;
1047 clear_bit(Faulty
, &rdev
->flags
);
1048 clear_bit(In_sync
, &rdev
->flags
);
1049 clear_bit(Bitmap_sync
, &rdev
->flags
);
1050 clear_bit(WriteMostly
, &rdev
->flags
);
1052 if (mddev
->raid_disks
== 0) {
1053 mddev
->major_version
= 0;
1054 mddev
->minor_version
= sb
->minor_version
;
1055 mddev
->patch_version
= sb
->patch_version
;
1056 mddev
->external
= 0;
1057 mddev
->chunk_sectors
= sb
->chunk_size
>> 9;
1058 mddev
->ctime
= sb
->ctime
;
1059 mddev
->utime
= sb
->utime
;
1060 mddev
->level
= sb
->level
;
1061 mddev
->clevel
[0] = 0;
1062 mddev
->layout
= sb
->layout
;
1063 mddev
->raid_disks
= sb
->raid_disks
;
1064 mddev
->dev_sectors
= ((sector_t
)sb
->size
) * 2;
1065 mddev
->events
= ev1
;
1066 mddev
->bitmap_info
.offset
= 0;
1067 mddev
->bitmap_info
.space
= 0;
1068 /* bitmap can use 60 K after the 4K superblocks */
1069 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
1070 mddev
->bitmap_info
.default_space
= 64*2 - (MD_SB_BYTES
>> 9);
1071 mddev
->reshape_backwards
= 0;
1073 if (mddev
->minor_version
>= 91) {
1074 mddev
->reshape_position
= sb
->reshape_position
;
1075 mddev
->delta_disks
= sb
->delta_disks
;
1076 mddev
->new_level
= sb
->new_level
;
1077 mddev
->new_layout
= sb
->new_layout
;
1078 mddev
->new_chunk_sectors
= sb
->new_chunk
>> 9;
1079 if (mddev
->delta_disks
< 0)
1080 mddev
->reshape_backwards
= 1;
1082 mddev
->reshape_position
= MaxSector
;
1083 mddev
->delta_disks
= 0;
1084 mddev
->new_level
= mddev
->level
;
1085 mddev
->new_layout
= mddev
->layout
;
1086 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1089 if (sb
->state
& (1<<MD_SB_CLEAN
))
1090 mddev
->recovery_cp
= MaxSector
;
1092 if (sb
->events_hi
== sb
->cp_events_hi
&&
1093 sb
->events_lo
== sb
->cp_events_lo
) {
1094 mddev
->recovery_cp
= sb
->recovery_cp
;
1096 mddev
->recovery_cp
= 0;
1099 memcpy(mddev
->uuid
+0, &sb
->set_uuid0
, 4);
1100 memcpy(mddev
->uuid
+4, &sb
->set_uuid1
, 4);
1101 memcpy(mddev
->uuid
+8, &sb
->set_uuid2
, 4);
1102 memcpy(mddev
->uuid
+12,&sb
->set_uuid3
, 4);
1104 mddev
->max_disks
= MD_SB_DISKS
;
1106 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
) &&
1107 mddev
->bitmap_info
.file
== NULL
) {
1108 mddev
->bitmap_info
.offset
=
1109 mddev
->bitmap_info
.default_offset
;
1110 mddev
->bitmap_info
.space
=
1111 mddev
->bitmap_info
.default_space
;
1114 } else if (mddev
->pers
== NULL
) {
1115 /* Insist on good event counter while assembling, except
1116 * for spares (which don't need an event count) */
1118 if (sb
->disks
[rdev
->desc_nr
].state
& (
1119 (1<<MD_DISK_SYNC
) | (1 << MD_DISK_ACTIVE
)))
1120 if (ev1
< mddev
->events
)
1122 } else if (mddev
->bitmap
) {
1123 /* if adding to array with a bitmap, then we can accept an
1124 * older device ... but not too old.
1126 if (ev1
< mddev
->bitmap
->events_cleared
)
1128 if (ev1
< mddev
->events
)
1129 set_bit(Bitmap_sync
, &rdev
->flags
);
1131 if (ev1
< mddev
->events
)
1132 /* just a hot-add of a new device, leave raid_disk at -1 */
1136 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1137 desc
= sb
->disks
+ rdev
->desc_nr
;
1139 if (desc
->state
& (1<<MD_DISK_FAULTY
))
1140 set_bit(Faulty
, &rdev
->flags
);
1141 else if (desc
->state
& (1<<MD_DISK_SYNC
) /* &&
1142 desc->raid_disk < mddev->raid_disks */) {
1143 set_bit(In_sync
, &rdev
->flags
);
1144 rdev
->raid_disk
= desc
->raid_disk
;
1145 rdev
->saved_raid_disk
= desc
->raid_disk
;
1146 } else if (desc
->state
& (1<<MD_DISK_ACTIVE
)) {
1147 /* active but not in sync implies recovery up to
1148 * reshape position. We don't know exactly where
1149 * that is, so set to zero for now */
1150 if (mddev
->minor_version
>= 91) {
1151 rdev
->recovery_offset
= 0;
1152 rdev
->raid_disk
= desc
->raid_disk
;
1155 if (desc
->state
& (1<<MD_DISK_WRITEMOSTLY
))
1156 set_bit(WriteMostly
, &rdev
->flags
);
1157 } else /* MULTIPATH are always insync */
1158 set_bit(In_sync
, &rdev
->flags
);
1163 * sync_super for 0.90.0
1165 static void super_90_sync(struct mddev
*mddev
, struct md_rdev
*rdev
)
1168 struct md_rdev
*rdev2
;
1169 int next_spare
= mddev
->raid_disks
;
1171 /* make rdev->sb match mddev data..
1174 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1175 * 3/ any empty disks < next_spare become removed
1177 * disks[0] gets initialised to REMOVED because
1178 * we cannot be sure from other fields if it has
1179 * been initialised or not.
1182 int active
=0, working
=0,failed
=0,spare
=0,nr_disks
=0;
1184 rdev
->sb_size
= MD_SB_BYTES
;
1186 sb
= page_address(rdev
->sb_page
);
1188 memset(sb
, 0, sizeof(*sb
));
1190 sb
->md_magic
= MD_SB_MAGIC
;
1191 sb
->major_version
= mddev
->major_version
;
1192 sb
->patch_version
= mddev
->patch_version
;
1193 sb
->gvalid_words
= 0; /* ignored */
1194 memcpy(&sb
->set_uuid0
, mddev
->uuid
+0, 4);
1195 memcpy(&sb
->set_uuid1
, mddev
->uuid
+4, 4);
1196 memcpy(&sb
->set_uuid2
, mddev
->uuid
+8, 4);
1197 memcpy(&sb
->set_uuid3
, mddev
->uuid
+12,4);
1199 sb
->ctime
= mddev
->ctime
;
1200 sb
->level
= mddev
->level
;
1201 sb
->size
= mddev
->dev_sectors
/ 2;
1202 sb
->raid_disks
= mddev
->raid_disks
;
1203 sb
->md_minor
= mddev
->md_minor
;
1204 sb
->not_persistent
= 0;
1205 sb
->utime
= mddev
->utime
;
1207 sb
->events_hi
= (mddev
->events
>>32);
1208 sb
->events_lo
= (u32
)mddev
->events
;
1210 if (mddev
->reshape_position
== MaxSector
)
1211 sb
->minor_version
= 90;
1213 sb
->minor_version
= 91;
1214 sb
->reshape_position
= mddev
->reshape_position
;
1215 sb
->new_level
= mddev
->new_level
;
1216 sb
->delta_disks
= mddev
->delta_disks
;
1217 sb
->new_layout
= mddev
->new_layout
;
1218 sb
->new_chunk
= mddev
->new_chunk_sectors
<< 9;
1220 mddev
->minor_version
= sb
->minor_version
;
1223 sb
->recovery_cp
= mddev
->recovery_cp
;
1224 sb
->cp_events_hi
= (mddev
->events
>>32);
1225 sb
->cp_events_lo
= (u32
)mddev
->events
;
1226 if (mddev
->recovery_cp
== MaxSector
)
1227 sb
->state
= (1<< MD_SB_CLEAN
);
1229 sb
->recovery_cp
= 0;
1231 sb
->layout
= mddev
->layout
;
1232 sb
->chunk_size
= mddev
->chunk_sectors
<< 9;
1234 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
)
1235 sb
->state
|= (1<<MD_SB_BITMAP_PRESENT
);
1237 sb
->disks
[0].state
= (1<<MD_DISK_REMOVED
);
1238 rdev_for_each(rdev2
, mddev
) {
1241 int is_active
= test_bit(In_sync
, &rdev2
->flags
);
1243 if (rdev2
->raid_disk
>= 0 &&
1244 sb
->minor_version
>= 91)
1245 /* we have nowhere to store the recovery_offset,
1246 * but if it is not below the reshape_position,
1247 * we can piggy-back on that.
1250 if (rdev2
->raid_disk
< 0 ||
1251 test_bit(Faulty
, &rdev2
->flags
))
1254 desc_nr
= rdev2
->raid_disk
;
1256 desc_nr
= next_spare
++;
1257 rdev2
->desc_nr
= desc_nr
;
1258 d
= &sb
->disks
[rdev2
->desc_nr
];
1260 d
->number
= rdev2
->desc_nr
;
1261 d
->major
= MAJOR(rdev2
->bdev
->bd_dev
);
1262 d
->minor
= MINOR(rdev2
->bdev
->bd_dev
);
1264 d
->raid_disk
= rdev2
->raid_disk
;
1266 d
->raid_disk
= rdev2
->desc_nr
; /* compatibility */
1267 if (test_bit(Faulty
, &rdev2
->flags
))
1268 d
->state
= (1<<MD_DISK_FAULTY
);
1269 else if (is_active
) {
1270 d
->state
= (1<<MD_DISK_ACTIVE
);
1271 if (test_bit(In_sync
, &rdev2
->flags
))
1272 d
->state
|= (1<<MD_DISK_SYNC
);
1280 if (test_bit(WriteMostly
, &rdev2
->flags
))
1281 d
->state
|= (1<<MD_DISK_WRITEMOSTLY
);
1283 /* now set the "removed" and "faulty" bits on any missing devices */
1284 for (i
=0 ; i
< mddev
->raid_disks
; i
++) {
1285 mdp_disk_t
*d
= &sb
->disks
[i
];
1286 if (d
->state
== 0 && d
->number
== 0) {
1289 d
->state
= (1<<MD_DISK_REMOVED
);
1290 d
->state
|= (1<<MD_DISK_FAULTY
);
1294 sb
->nr_disks
= nr_disks
;
1295 sb
->active_disks
= active
;
1296 sb
->working_disks
= working
;
1297 sb
->failed_disks
= failed
;
1298 sb
->spare_disks
= spare
;
1300 sb
->this_disk
= sb
->disks
[rdev
->desc_nr
];
1301 sb
->sb_csum
= calc_sb_csum(sb
);
1305 * rdev_size_change for 0.90.0
1307 static unsigned long long
1308 super_90_rdev_size_change(struct md_rdev
*rdev
, sector_t num_sectors
)
1310 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1311 return 0; /* component must fit device */
1312 if (rdev
->mddev
->bitmap_info
.offset
)
1313 return 0; /* can't move bitmap */
1314 rdev
->sb_start
= calc_dev_sboffset(rdev
);
1315 if (!num_sectors
|| num_sectors
> rdev
->sb_start
)
1316 num_sectors
= rdev
->sb_start
;
1317 /* Limit to 4TB as metadata cannot record more than that.
1318 * 4TB == 2^32 KB, or 2*2^32 sectors.
1320 if (num_sectors
>= (2ULL << 32) && rdev
->mddev
->level
>= 1)
1321 num_sectors
= (2ULL << 32) - 2;
1322 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1324 md_super_wait(rdev
->mddev
);
1329 super_90_allow_new_offset(struct md_rdev
*rdev
, unsigned long long new_offset
)
1331 /* non-zero offset changes not possible with v0.90 */
1332 return new_offset
== 0;
1336 * version 1 superblock
1339 static __le32
calc_sb_1_csum(struct mdp_superblock_1
*sb
)
1343 unsigned long long newcsum
;
1344 int size
= 256 + le32_to_cpu(sb
->max_dev
)*2;
1345 __le32
*isuper
= (__le32
*)sb
;
1347 disk_csum
= sb
->sb_csum
;
1350 for (; size
>= 4; size
-= 4)
1351 newcsum
+= le32_to_cpu(*isuper
++);
1354 newcsum
+= le16_to_cpu(*(__le16
*) isuper
);
1356 csum
= (newcsum
& 0xffffffff) + (newcsum
>> 32);
1357 sb
->sb_csum
= disk_csum
;
1358 return cpu_to_le32(csum
);
1361 static int md_set_badblocks(struct badblocks
*bb
, sector_t s
, int sectors
,
1363 static int super_1_load(struct md_rdev
*rdev
, struct md_rdev
*refdev
, int minor_version
)
1365 struct mdp_superblock_1
*sb
;
1369 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1373 * Calculate the position of the superblock in 512byte sectors.
1374 * It is always aligned to a 4K boundary and
1375 * depeding on minor_version, it can be:
1376 * 0: At least 8K, but less than 12K, from end of device
1377 * 1: At start of device
1378 * 2: 4K from start of device.
1380 switch(minor_version
) {
1382 sb_start
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1384 sb_start
&= ~(sector_t
)(4*2-1);
1395 rdev
->sb_start
= sb_start
;
1397 /* superblock is rarely larger than 1K, but it can be larger,
1398 * and it is safe to read 4k, so we do that
1400 ret
= read_disk_sb(rdev
, 4096);
1401 if (ret
) return ret
;
1403 sb
= page_address(rdev
->sb_page
);
1405 if (sb
->magic
!= cpu_to_le32(MD_SB_MAGIC
) ||
1406 sb
->major_version
!= cpu_to_le32(1) ||
1407 le32_to_cpu(sb
->max_dev
) > (4096-256)/2 ||
1408 le64_to_cpu(sb
->super_offset
) != rdev
->sb_start
||
1409 (le32_to_cpu(sb
->feature_map
) & ~MD_FEATURE_ALL
) != 0)
1412 if (calc_sb_1_csum(sb
) != sb
->sb_csum
) {
1413 printk("md: invalid superblock checksum on %s\n",
1414 bdevname(rdev
->bdev
,b
));
1417 if (le64_to_cpu(sb
->data_size
) < 10) {
1418 printk("md: data_size too small on %s\n",
1419 bdevname(rdev
->bdev
,b
));
1424 memcmp(sb
->pad3
, sb
->pad3
+1, sizeof(sb
->pad3
) - sizeof(sb
->pad3
[1])))
1425 /* Some padding is non-zero, might be a new feature */
1428 rdev
->preferred_minor
= 0xffff;
1429 rdev
->data_offset
= le64_to_cpu(sb
->data_offset
);
1430 rdev
->new_data_offset
= rdev
->data_offset
;
1431 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
) &&
1432 (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_NEW_OFFSET
))
1433 rdev
->new_data_offset
+= (s32
)le32_to_cpu(sb
->new_offset
);
1434 atomic_set(&rdev
->corrected_errors
, le32_to_cpu(sb
->cnt_corrected_read
));
1436 rdev
->sb_size
= le32_to_cpu(sb
->max_dev
) * 2 + 256;
1437 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1438 if (rdev
->sb_size
& bmask
)
1439 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1442 && rdev
->data_offset
< sb_start
+ (rdev
->sb_size
/512))
1445 && rdev
->new_data_offset
< sb_start
+ (rdev
->sb_size
/512))
1448 if (sb
->level
== cpu_to_le32(LEVEL_MULTIPATH
))
1451 rdev
->desc_nr
= le32_to_cpu(sb
->dev_number
);
1453 if (!rdev
->bb_page
) {
1454 rdev
->bb_page
= alloc_page(GFP_KERNEL
);
1458 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BAD_BLOCKS
) &&
1459 rdev
->badblocks
.count
== 0) {
1460 /* need to load the bad block list.
1461 * Currently we limit it to one page.
1467 int sectors
= le16_to_cpu(sb
->bblog_size
);
1468 if (sectors
> (PAGE_SIZE
/ 512))
1470 offset
= le32_to_cpu(sb
->bblog_offset
);
1473 bb_sector
= (long long)offset
;
1474 if (!sync_page_io(rdev
, bb_sector
, sectors
<< 9,
1475 rdev
->bb_page
, READ
, true))
1477 bbp
= (u64
*)page_address(rdev
->bb_page
);
1478 rdev
->badblocks
.shift
= sb
->bblog_shift
;
1479 for (i
= 0 ; i
< (sectors
<< (9-3)) ; i
++, bbp
++) {
1480 u64 bb
= le64_to_cpu(*bbp
);
1481 int count
= bb
& (0x3ff);
1482 u64 sector
= bb
>> 10;
1483 sector
<<= sb
->bblog_shift
;
1484 count
<<= sb
->bblog_shift
;
1487 if (md_set_badblocks(&rdev
->badblocks
,
1488 sector
, count
, 1) == 0)
1491 } else if (sb
->bblog_offset
!= 0)
1492 rdev
->badblocks
.shift
= 0;
1498 struct mdp_superblock_1
*refsb
= page_address(refdev
->sb_page
);
1500 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16) != 0 ||
1501 sb
->level
!= refsb
->level
||
1502 sb
->layout
!= refsb
->layout
||
1503 sb
->chunksize
!= refsb
->chunksize
) {
1504 printk(KERN_WARNING
"md: %s has strangely different"
1505 " superblock to %s\n",
1506 bdevname(rdev
->bdev
,b
),
1507 bdevname(refdev
->bdev
,b2
));
1510 ev1
= le64_to_cpu(sb
->events
);
1511 ev2
= le64_to_cpu(refsb
->events
);
1518 if (minor_version
) {
1519 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9);
1520 sectors
-= rdev
->data_offset
;
1522 sectors
= rdev
->sb_start
;
1523 if (sectors
< le64_to_cpu(sb
->data_size
))
1525 rdev
->sectors
= le64_to_cpu(sb
->data_size
);
1529 static int super_1_validate(struct mddev
*mddev
, struct md_rdev
*rdev
)
1531 struct mdp_superblock_1
*sb
= page_address(rdev
->sb_page
);
1532 __u64 ev1
= le64_to_cpu(sb
->events
);
1534 rdev
->raid_disk
= -1;
1535 clear_bit(Faulty
, &rdev
->flags
);
1536 clear_bit(In_sync
, &rdev
->flags
);
1537 clear_bit(Bitmap_sync
, &rdev
->flags
);
1538 clear_bit(WriteMostly
, &rdev
->flags
);
1540 if (mddev
->raid_disks
== 0) {
1541 mddev
->major_version
= 1;
1542 mddev
->patch_version
= 0;
1543 mddev
->external
= 0;
1544 mddev
->chunk_sectors
= le32_to_cpu(sb
->chunksize
);
1545 mddev
->ctime
= le64_to_cpu(sb
->ctime
) & ((1ULL << 32)-1);
1546 mddev
->utime
= le64_to_cpu(sb
->utime
) & ((1ULL << 32)-1);
1547 mddev
->level
= le32_to_cpu(sb
->level
);
1548 mddev
->clevel
[0] = 0;
1549 mddev
->layout
= le32_to_cpu(sb
->layout
);
1550 mddev
->raid_disks
= le32_to_cpu(sb
->raid_disks
);
1551 mddev
->dev_sectors
= le64_to_cpu(sb
->size
);
1552 mddev
->events
= ev1
;
1553 mddev
->bitmap_info
.offset
= 0;
1554 mddev
->bitmap_info
.space
= 0;
1555 /* Default location for bitmap is 1K after superblock
1556 * using 3K - total of 4K
1558 mddev
->bitmap_info
.default_offset
= 1024 >> 9;
1559 mddev
->bitmap_info
.default_space
= (4096-1024) >> 9;
1560 mddev
->reshape_backwards
= 0;
1562 mddev
->recovery_cp
= le64_to_cpu(sb
->resync_offset
);
1563 memcpy(mddev
->uuid
, sb
->set_uuid
, 16);
1565 mddev
->max_disks
= (4096-256)/2;
1567 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
) &&
1568 mddev
->bitmap_info
.file
== NULL
) {
1569 mddev
->bitmap_info
.offset
=
1570 (__s32
)le32_to_cpu(sb
->bitmap_offset
);
1571 /* Metadata doesn't record how much space is available.
1572 * For 1.0, we assume we can use up to the superblock
1573 * if before, else to 4K beyond superblock.
1574 * For others, assume no change is possible.
1576 if (mddev
->minor_version
> 0)
1577 mddev
->bitmap_info
.space
= 0;
1578 else if (mddev
->bitmap_info
.offset
> 0)
1579 mddev
->bitmap_info
.space
=
1580 8 - mddev
->bitmap_info
.offset
;
1582 mddev
->bitmap_info
.space
=
1583 -mddev
->bitmap_info
.offset
;
1586 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
1587 mddev
->reshape_position
= le64_to_cpu(sb
->reshape_position
);
1588 mddev
->delta_disks
= le32_to_cpu(sb
->delta_disks
);
1589 mddev
->new_level
= le32_to_cpu(sb
->new_level
);
1590 mddev
->new_layout
= le32_to_cpu(sb
->new_layout
);
1591 mddev
->new_chunk_sectors
= le32_to_cpu(sb
->new_chunk
);
1592 if (mddev
->delta_disks
< 0 ||
1593 (mddev
->delta_disks
== 0 &&
1594 (le32_to_cpu(sb
->feature_map
)
1595 & MD_FEATURE_RESHAPE_BACKWARDS
)))
1596 mddev
->reshape_backwards
= 1;
1598 mddev
->reshape_position
= MaxSector
;
1599 mddev
->delta_disks
= 0;
1600 mddev
->new_level
= mddev
->level
;
1601 mddev
->new_layout
= mddev
->layout
;
1602 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1605 } else if (mddev
->pers
== NULL
) {
1606 /* Insist of good event counter while assembling, except for
1607 * spares (which don't need an event count) */
1609 if (rdev
->desc_nr
>= 0 &&
1610 rdev
->desc_nr
< le32_to_cpu(sb
->max_dev
) &&
1611 le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]) < 0xfffe)
1612 if (ev1
< mddev
->events
)
1614 } else if (mddev
->bitmap
) {
1615 /* If adding to array with a bitmap, then we can accept an
1616 * older device, but not too old.
1618 if (ev1
< mddev
->bitmap
->events_cleared
)
1620 if (ev1
< mddev
->events
)
1621 set_bit(Bitmap_sync
, &rdev
->flags
);
1623 if (ev1
< mddev
->events
)
1624 /* just a hot-add of a new device, leave raid_disk at -1 */
1627 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1629 if (rdev
->desc_nr
< 0 ||
1630 rdev
->desc_nr
>= le32_to_cpu(sb
->max_dev
)) {
1634 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
1636 case 0xffff: /* spare */
1638 case 0xfffe: /* faulty */
1639 set_bit(Faulty
, &rdev
->flags
);
1642 rdev
->saved_raid_disk
= role
;
1643 if ((le32_to_cpu(sb
->feature_map
) &
1644 MD_FEATURE_RECOVERY_OFFSET
)) {
1645 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
1646 if (!(le32_to_cpu(sb
->feature_map
) &
1647 MD_FEATURE_RECOVERY_BITMAP
))
1648 rdev
->saved_raid_disk
= -1;
1650 set_bit(In_sync
, &rdev
->flags
);
1651 rdev
->raid_disk
= role
;
1654 if (sb
->devflags
& WriteMostly1
)
1655 set_bit(WriteMostly
, &rdev
->flags
);
1656 if (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_REPLACEMENT
)
1657 set_bit(Replacement
, &rdev
->flags
);
1658 } else /* MULTIPATH are always insync */
1659 set_bit(In_sync
, &rdev
->flags
);
1664 static void super_1_sync(struct mddev
*mddev
, struct md_rdev
*rdev
)
1666 struct mdp_superblock_1
*sb
;
1667 struct md_rdev
*rdev2
;
1669 /* make rdev->sb match mddev and rdev data. */
1671 sb
= page_address(rdev
->sb_page
);
1673 sb
->feature_map
= 0;
1675 sb
->recovery_offset
= cpu_to_le64(0);
1676 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
1678 sb
->utime
= cpu_to_le64((__u64
)mddev
->utime
);
1679 sb
->events
= cpu_to_le64(mddev
->events
);
1681 sb
->resync_offset
= cpu_to_le64(mddev
->recovery_cp
);
1683 sb
->resync_offset
= cpu_to_le64(0);
1685 sb
->cnt_corrected_read
= cpu_to_le32(atomic_read(&rdev
->corrected_errors
));
1687 sb
->raid_disks
= cpu_to_le32(mddev
->raid_disks
);
1688 sb
->size
= cpu_to_le64(mddev
->dev_sectors
);
1689 sb
->chunksize
= cpu_to_le32(mddev
->chunk_sectors
);
1690 sb
->level
= cpu_to_le32(mddev
->level
);
1691 sb
->layout
= cpu_to_le32(mddev
->layout
);
1693 if (test_bit(WriteMostly
, &rdev
->flags
))
1694 sb
->devflags
|= WriteMostly1
;
1696 sb
->devflags
&= ~WriteMostly1
;
1697 sb
->data_offset
= cpu_to_le64(rdev
->data_offset
);
1698 sb
->data_size
= cpu_to_le64(rdev
->sectors
);
1700 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
) {
1701 sb
->bitmap_offset
= cpu_to_le32((__u32
)mddev
->bitmap_info
.offset
);
1702 sb
->feature_map
= cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
);
1705 if (rdev
->raid_disk
>= 0 &&
1706 !test_bit(In_sync
, &rdev
->flags
)) {
1708 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET
);
1709 sb
->recovery_offset
=
1710 cpu_to_le64(rdev
->recovery_offset
);
1711 if (rdev
->saved_raid_disk
>= 0 && mddev
->bitmap
)
1713 cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP
);
1715 if (test_bit(Replacement
, &rdev
->flags
))
1717 cpu_to_le32(MD_FEATURE_REPLACEMENT
);
1719 if (mddev
->reshape_position
!= MaxSector
) {
1720 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE
);
1721 sb
->reshape_position
= cpu_to_le64(mddev
->reshape_position
);
1722 sb
->new_layout
= cpu_to_le32(mddev
->new_layout
);
1723 sb
->delta_disks
= cpu_to_le32(mddev
->delta_disks
);
1724 sb
->new_level
= cpu_to_le32(mddev
->new_level
);
1725 sb
->new_chunk
= cpu_to_le32(mddev
->new_chunk_sectors
);
1726 if (mddev
->delta_disks
== 0 &&
1727 mddev
->reshape_backwards
)
1729 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS
);
1730 if (rdev
->new_data_offset
!= rdev
->data_offset
) {
1732 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET
);
1733 sb
->new_offset
= cpu_to_le32((__u32
)(rdev
->new_data_offset
1734 - rdev
->data_offset
));
1738 if (mddev_is_clustered(mddev
))
1739 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_CLUSTERED
);
1741 if (rdev
->badblocks
.count
== 0)
1742 /* Nothing to do for bad blocks*/ ;
1743 else if (sb
->bblog_offset
== 0)
1744 /* Cannot record bad blocks on this device */
1745 md_error(mddev
, rdev
);
1747 struct badblocks
*bb
= &rdev
->badblocks
;
1748 u64
*bbp
= (u64
*)page_address(rdev
->bb_page
);
1750 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_BAD_BLOCKS
);
1755 seq
= read_seqbegin(&bb
->lock
);
1757 memset(bbp
, 0xff, PAGE_SIZE
);
1759 for (i
= 0 ; i
< bb
->count
; i
++) {
1760 u64 internal_bb
= p
[i
];
1761 u64 store_bb
= ((BB_OFFSET(internal_bb
) << 10)
1762 | BB_LEN(internal_bb
));
1763 bbp
[i
] = cpu_to_le64(store_bb
);
1766 if (read_seqretry(&bb
->lock
, seq
))
1769 bb
->sector
= (rdev
->sb_start
+
1770 (int)le32_to_cpu(sb
->bblog_offset
));
1771 bb
->size
= le16_to_cpu(sb
->bblog_size
);
1776 rdev_for_each(rdev2
, mddev
)
1777 if (rdev2
->desc_nr
+1 > max_dev
)
1778 max_dev
= rdev2
->desc_nr
+1;
1780 if (max_dev
> le32_to_cpu(sb
->max_dev
)) {
1782 sb
->max_dev
= cpu_to_le32(max_dev
);
1783 rdev
->sb_size
= max_dev
* 2 + 256;
1784 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1785 if (rdev
->sb_size
& bmask
)
1786 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1788 max_dev
= le32_to_cpu(sb
->max_dev
);
1790 for (i
=0; i
<max_dev
;i
++)
1791 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1793 rdev_for_each(rdev2
, mddev
) {
1795 if (test_bit(Faulty
, &rdev2
->flags
))
1796 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1797 else if (test_bit(In_sync
, &rdev2
->flags
))
1798 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1799 else if (rdev2
->raid_disk
>= 0)
1800 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1802 sb
->dev_roles
[i
] = cpu_to_le16(0xffff);
1805 sb
->sb_csum
= calc_sb_1_csum(sb
);
1808 static unsigned long long
1809 super_1_rdev_size_change(struct md_rdev
*rdev
, sector_t num_sectors
)
1811 struct mdp_superblock_1
*sb
;
1812 sector_t max_sectors
;
1813 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1814 return 0; /* component must fit device */
1815 if (rdev
->data_offset
!= rdev
->new_data_offset
)
1816 return 0; /* too confusing */
1817 if (rdev
->sb_start
< rdev
->data_offset
) {
1818 /* minor versions 1 and 2; superblock before data */
1819 max_sectors
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1820 max_sectors
-= rdev
->data_offset
;
1821 if (!num_sectors
|| num_sectors
> max_sectors
)
1822 num_sectors
= max_sectors
;
1823 } else if (rdev
->mddev
->bitmap_info
.offset
) {
1824 /* minor version 0 with bitmap we can't move */
1827 /* minor version 0; superblock after data */
1829 sb_start
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) - 8*2;
1830 sb_start
&= ~(sector_t
)(4*2 - 1);
1831 max_sectors
= rdev
->sectors
+ sb_start
- rdev
->sb_start
;
1832 if (!num_sectors
|| num_sectors
> max_sectors
)
1833 num_sectors
= max_sectors
;
1834 rdev
->sb_start
= sb_start
;
1836 sb
= page_address(rdev
->sb_page
);
1837 sb
->data_size
= cpu_to_le64(num_sectors
);
1838 sb
->super_offset
= rdev
->sb_start
;
1839 sb
->sb_csum
= calc_sb_1_csum(sb
);
1840 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1842 md_super_wait(rdev
->mddev
);
1848 super_1_allow_new_offset(struct md_rdev
*rdev
,
1849 unsigned long long new_offset
)
1851 /* All necessary checks on new >= old have been done */
1852 struct bitmap
*bitmap
;
1853 if (new_offset
>= rdev
->data_offset
)
1856 /* with 1.0 metadata, there is no metadata to tread on
1857 * so we can always move back */
1858 if (rdev
->mddev
->minor_version
== 0)
1861 /* otherwise we must be sure not to step on
1862 * any metadata, so stay:
1863 * 36K beyond start of superblock
1864 * beyond end of badblocks
1865 * beyond write-intent bitmap
1867 if (rdev
->sb_start
+ (32+4)*2 > new_offset
)
1869 bitmap
= rdev
->mddev
->bitmap
;
1870 if (bitmap
&& !rdev
->mddev
->bitmap_info
.file
&&
1871 rdev
->sb_start
+ rdev
->mddev
->bitmap_info
.offset
+
1872 bitmap
->storage
.file_pages
* (PAGE_SIZE
>>9) > new_offset
)
1874 if (rdev
->badblocks
.sector
+ rdev
->badblocks
.size
> new_offset
)
1880 static struct super_type super_types
[] = {
1883 .owner
= THIS_MODULE
,
1884 .load_super
= super_90_load
,
1885 .validate_super
= super_90_validate
,
1886 .sync_super
= super_90_sync
,
1887 .rdev_size_change
= super_90_rdev_size_change
,
1888 .allow_new_offset
= super_90_allow_new_offset
,
1892 .owner
= THIS_MODULE
,
1893 .load_super
= super_1_load
,
1894 .validate_super
= super_1_validate
,
1895 .sync_super
= super_1_sync
,
1896 .rdev_size_change
= super_1_rdev_size_change
,
1897 .allow_new_offset
= super_1_allow_new_offset
,
1901 static void sync_super(struct mddev
*mddev
, struct md_rdev
*rdev
)
1903 if (mddev
->sync_super
) {
1904 mddev
->sync_super(mddev
, rdev
);
1908 BUG_ON(mddev
->major_version
>= ARRAY_SIZE(super_types
));
1910 super_types
[mddev
->major_version
].sync_super(mddev
, rdev
);
1913 static int match_mddev_units(struct mddev
*mddev1
, struct mddev
*mddev2
)
1915 struct md_rdev
*rdev
, *rdev2
;
1918 rdev_for_each_rcu(rdev
, mddev1
)
1919 rdev_for_each_rcu(rdev2
, mddev2
)
1920 if (rdev
->bdev
->bd_contains
==
1921 rdev2
->bdev
->bd_contains
) {
1929 static LIST_HEAD(pending_raid_disks
);
1932 * Try to register data integrity profile for an mddev
1934 * This is called when an array is started and after a disk has been kicked
1935 * from the array. It only succeeds if all working and active component devices
1936 * are integrity capable with matching profiles.
1938 int md_integrity_register(struct mddev
*mddev
)
1940 struct md_rdev
*rdev
, *reference
= NULL
;
1942 if (list_empty(&mddev
->disks
))
1943 return 0; /* nothing to do */
1944 if (!mddev
->gendisk
|| blk_get_integrity(mddev
->gendisk
))
1945 return 0; /* shouldn't register, or already is */
1946 rdev_for_each(rdev
, mddev
) {
1947 /* skip spares and non-functional disks */
1948 if (test_bit(Faulty
, &rdev
->flags
))
1950 if (rdev
->raid_disk
< 0)
1953 /* Use the first rdev as the reference */
1957 /* does this rdev's profile match the reference profile? */
1958 if (blk_integrity_compare(reference
->bdev
->bd_disk
,
1959 rdev
->bdev
->bd_disk
) < 0)
1962 if (!reference
|| !bdev_get_integrity(reference
->bdev
))
1965 * All component devices are integrity capable and have matching
1966 * profiles, register the common profile for the md device.
1968 if (blk_integrity_register(mddev
->gendisk
,
1969 bdev_get_integrity(reference
->bdev
)) != 0) {
1970 printk(KERN_ERR
"md: failed to register integrity for %s\n",
1974 printk(KERN_NOTICE
"md: data integrity enabled on %s\n", mdname(mddev
));
1975 if (bioset_integrity_create(mddev
->bio_set
, BIO_POOL_SIZE
)) {
1976 printk(KERN_ERR
"md: failed to create integrity pool for %s\n",
1982 EXPORT_SYMBOL(md_integrity_register
);
1984 /* Disable data integrity if non-capable/non-matching disk is being added */
1985 void md_integrity_add_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
1987 struct blk_integrity
*bi_rdev
;
1988 struct blk_integrity
*bi_mddev
;
1990 if (!mddev
->gendisk
)
1993 bi_rdev
= bdev_get_integrity(rdev
->bdev
);
1994 bi_mddev
= blk_get_integrity(mddev
->gendisk
);
1996 if (!bi_mddev
) /* nothing to do */
1998 if (rdev
->raid_disk
< 0) /* skip spares */
2000 if (bi_rdev
&& blk_integrity_compare(mddev
->gendisk
,
2001 rdev
->bdev
->bd_disk
) >= 0)
2003 printk(KERN_NOTICE
"disabling data integrity on %s\n", mdname(mddev
));
2004 blk_integrity_unregister(mddev
->gendisk
);
2006 EXPORT_SYMBOL(md_integrity_add_rdev
);
2008 static int bind_rdev_to_array(struct md_rdev
*rdev
, struct mddev
*mddev
)
2010 char b
[BDEVNAME_SIZE
];
2014 /* prevent duplicates */
2015 if (find_rdev(mddev
, rdev
->bdev
->bd_dev
))
2018 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2019 if (rdev
->sectors
&& (mddev
->dev_sectors
== 0 ||
2020 rdev
->sectors
< mddev
->dev_sectors
)) {
2022 /* Cannot change size, so fail
2023 * If mddev->level <= 0, then we don't care
2024 * about aligning sizes (e.g. linear)
2026 if (mddev
->level
> 0)
2029 mddev
->dev_sectors
= rdev
->sectors
;
2032 /* Verify rdev->desc_nr is unique.
2033 * If it is -1, assign a free number, else
2034 * check number is not in use
2037 if (rdev
->desc_nr
< 0) {
2040 choice
= mddev
->raid_disks
;
2041 while (md_find_rdev_nr_rcu(mddev
, choice
))
2043 rdev
->desc_nr
= choice
;
2045 if (md_find_rdev_nr_rcu(mddev
, rdev
->desc_nr
)) {
2051 if (mddev
->max_disks
&& rdev
->desc_nr
>= mddev
->max_disks
) {
2052 printk(KERN_WARNING
"md: %s: array is limited to %d devices\n",
2053 mdname(mddev
), mddev
->max_disks
);
2056 bdevname(rdev
->bdev
,b
);
2057 strreplace(b
, '/', '!');
2059 rdev
->mddev
= mddev
;
2060 printk(KERN_INFO
"md: bind<%s>\n", b
);
2062 if ((err
= kobject_add(&rdev
->kobj
, &mddev
->kobj
, "dev-%s", b
)))
2065 ko
= &part_to_dev(rdev
->bdev
->bd_part
)->kobj
;
2066 if (sysfs_create_link(&rdev
->kobj
, ko
, "block"))
2067 /* failure here is OK */;
2068 rdev
->sysfs_state
= sysfs_get_dirent_safe(rdev
->kobj
.sd
, "state");
2070 list_add_rcu(&rdev
->same_set
, &mddev
->disks
);
2071 bd_link_disk_holder(rdev
->bdev
, mddev
->gendisk
);
2073 /* May as well allow recovery to be retried once */
2074 mddev
->recovery_disabled
++;
2079 printk(KERN_WARNING
"md: failed to register dev-%s for %s\n",
2084 static void md_delayed_delete(struct work_struct
*ws
)
2086 struct md_rdev
*rdev
= container_of(ws
, struct md_rdev
, del_work
);
2087 kobject_del(&rdev
->kobj
);
2088 kobject_put(&rdev
->kobj
);
2091 static void unbind_rdev_from_array(struct md_rdev
*rdev
)
2093 char b
[BDEVNAME_SIZE
];
2095 bd_unlink_disk_holder(rdev
->bdev
, rdev
->mddev
->gendisk
);
2096 list_del_rcu(&rdev
->same_set
);
2097 printk(KERN_INFO
"md: unbind<%s>\n", bdevname(rdev
->bdev
,b
));
2099 sysfs_remove_link(&rdev
->kobj
, "block");
2100 sysfs_put(rdev
->sysfs_state
);
2101 rdev
->sysfs_state
= NULL
;
2102 rdev
->badblocks
.count
= 0;
2103 /* We need to delay this, otherwise we can deadlock when
2104 * writing to 'remove' to "dev/state". We also need
2105 * to delay it due to rcu usage.
2108 INIT_WORK(&rdev
->del_work
, md_delayed_delete
);
2109 kobject_get(&rdev
->kobj
);
2110 queue_work(md_misc_wq
, &rdev
->del_work
);
2114 * prevent the device from being mounted, repartitioned or
2115 * otherwise reused by a RAID array (or any other kernel
2116 * subsystem), by bd_claiming the device.
2118 static int lock_rdev(struct md_rdev
*rdev
, dev_t dev
, int shared
)
2121 struct block_device
*bdev
;
2122 char b
[BDEVNAME_SIZE
];
2124 bdev
= blkdev_get_by_dev(dev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
,
2125 shared
? (struct md_rdev
*)lock_rdev
: rdev
);
2127 printk(KERN_ERR
"md: could not open %s.\n",
2128 __bdevname(dev
, b
));
2129 return PTR_ERR(bdev
);
2135 static void unlock_rdev(struct md_rdev
*rdev
)
2137 struct block_device
*bdev
= rdev
->bdev
;
2139 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
);
2142 void md_autodetect_dev(dev_t dev
);
2144 static void export_rdev(struct md_rdev
*rdev
)
2146 char b
[BDEVNAME_SIZE
];
2148 printk(KERN_INFO
"md: export_rdev(%s)\n",
2149 bdevname(rdev
->bdev
,b
));
2150 md_rdev_clear(rdev
);
2152 if (test_bit(AutoDetected
, &rdev
->flags
))
2153 md_autodetect_dev(rdev
->bdev
->bd_dev
);
2156 kobject_put(&rdev
->kobj
);
2159 void md_kick_rdev_from_array(struct md_rdev
*rdev
)
2161 unbind_rdev_from_array(rdev
);
2164 EXPORT_SYMBOL_GPL(md_kick_rdev_from_array
);
2166 static void export_array(struct mddev
*mddev
)
2168 struct md_rdev
*rdev
;
2170 while (!list_empty(&mddev
->disks
)) {
2171 rdev
= list_first_entry(&mddev
->disks
, struct md_rdev
,
2173 md_kick_rdev_from_array(rdev
);
2175 mddev
->raid_disks
= 0;
2176 mddev
->major_version
= 0;
2179 static void sync_sbs(struct mddev
*mddev
, int nospares
)
2181 /* Update each superblock (in-memory image), but
2182 * if we are allowed to, skip spares which already
2183 * have the right event counter, or have one earlier
2184 * (which would mean they aren't being marked as dirty
2185 * with the rest of the array)
2187 struct md_rdev
*rdev
;
2188 rdev_for_each(rdev
, mddev
) {
2189 if (rdev
->sb_events
== mddev
->events
||
2191 rdev
->raid_disk
< 0 &&
2192 rdev
->sb_events
+1 == mddev
->events
)) {
2193 /* Don't update this superblock */
2194 rdev
->sb_loaded
= 2;
2196 sync_super(mddev
, rdev
);
2197 rdev
->sb_loaded
= 1;
2202 void md_update_sb(struct mddev
*mddev
, int force_change
)
2204 struct md_rdev
*rdev
;
2207 int any_badblocks_changed
= 0;
2211 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
2215 /* First make sure individual recovery_offsets are correct */
2216 rdev_for_each(rdev
, mddev
) {
2217 if (rdev
->raid_disk
>= 0 &&
2218 mddev
->delta_disks
>= 0 &&
2219 !test_bit(In_sync
, &rdev
->flags
) &&
2220 mddev
->curr_resync_completed
> rdev
->recovery_offset
)
2221 rdev
->recovery_offset
= mddev
->curr_resync_completed
;
2224 if (!mddev
->persistent
) {
2225 clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
2226 clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
2227 if (!mddev
->external
) {
2228 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2229 rdev_for_each(rdev
, mddev
) {
2230 if (rdev
->badblocks
.changed
) {
2231 rdev
->badblocks
.changed
= 0;
2232 md_ack_all_badblocks(&rdev
->badblocks
);
2233 md_error(mddev
, rdev
);
2235 clear_bit(Blocked
, &rdev
->flags
);
2236 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2237 wake_up(&rdev
->blocked_wait
);
2240 wake_up(&mddev
->sb_wait
);
2244 spin_lock(&mddev
->lock
);
2246 mddev
->utime
= get_seconds();
2248 if (test_and_clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
))
2250 if (test_and_clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
2251 /* just a clean<-> dirty transition, possibly leave spares alone,
2252 * though if events isn't the right even/odd, we will have to do
2258 if (mddev
->degraded
)
2259 /* If the array is degraded, then skipping spares is both
2260 * dangerous and fairly pointless.
2261 * Dangerous because a device that was removed from the array
2262 * might have a event_count that still looks up-to-date,
2263 * so it can be re-added without a resync.
2264 * Pointless because if there are any spares to skip,
2265 * then a recovery will happen and soon that array won't
2266 * be degraded any more and the spare can go back to sleep then.
2270 sync_req
= mddev
->in_sync
;
2272 /* If this is just a dirty<->clean transition, and the array is clean
2273 * and 'events' is odd, we can roll back to the previous clean state */
2275 && (mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
2276 && mddev
->can_decrease_events
2277 && mddev
->events
!= 1) {
2279 mddev
->can_decrease_events
= 0;
2281 /* otherwise we have to go forward and ... */
2283 mddev
->can_decrease_events
= nospares
;
2287 * This 64-bit counter should never wrap.
2288 * Either we are in around ~1 trillion A.C., assuming
2289 * 1 reboot per second, or we have a bug...
2291 WARN_ON(mddev
->events
== 0);
2293 rdev_for_each(rdev
, mddev
) {
2294 if (rdev
->badblocks
.changed
)
2295 any_badblocks_changed
++;
2296 if (test_bit(Faulty
, &rdev
->flags
))
2297 set_bit(FaultRecorded
, &rdev
->flags
);
2300 sync_sbs(mddev
, nospares
);
2301 spin_unlock(&mddev
->lock
);
2303 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2304 mdname(mddev
), mddev
->in_sync
);
2306 bitmap_update_sb(mddev
->bitmap
);
2307 rdev_for_each(rdev
, mddev
) {
2308 char b
[BDEVNAME_SIZE
];
2310 if (rdev
->sb_loaded
!= 1)
2311 continue; /* no noise on spare devices */
2313 if (!test_bit(Faulty
, &rdev
->flags
)) {
2314 md_super_write(mddev
,rdev
,
2315 rdev
->sb_start
, rdev
->sb_size
,
2317 pr_debug("md: (write) %s's sb offset: %llu\n",
2318 bdevname(rdev
->bdev
, b
),
2319 (unsigned long long)rdev
->sb_start
);
2320 rdev
->sb_events
= mddev
->events
;
2321 if (rdev
->badblocks
.size
) {
2322 md_super_write(mddev
, rdev
,
2323 rdev
->badblocks
.sector
,
2324 rdev
->badblocks
.size
<< 9,
2326 rdev
->badblocks
.size
= 0;
2330 pr_debug("md: %s (skipping faulty)\n",
2331 bdevname(rdev
->bdev
, b
));
2333 if (mddev
->level
== LEVEL_MULTIPATH
)
2334 /* only need to write one superblock... */
2337 md_super_wait(mddev
);
2338 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2340 spin_lock(&mddev
->lock
);
2341 if (mddev
->in_sync
!= sync_req
||
2342 test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
2343 /* have to write it out again */
2344 spin_unlock(&mddev
->lock
);
2347 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2348 spin_unlock(&mddev
->lock
);
2349 wake_up(&mddev
->sb_wait
);
2350 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
2351 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
2353 rdev_for_each(rdev
, mddev
) {
2354 if (test_and_clear_bit(FaultRecorded
, &rdev
->flags
))
2355 clear_bit(Blocked
, &rdev
->flags
);
2357 if (any_badblocks_changed
)
2358 md_ack_all_badblocks(&rdev
->badblocks
);
2359 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2360 wake_up(&rdev
->blocked_wait
);
2363 EXPORT_SYMBOL(md_update_sb
);
2365 static int add_bound_rdev(struct md_rdev
*rdev
)
2367 struct mddev
*mddev
= rdev
->mddev
;
2370 if (!mddev
->pers
->hot_remove_disk
) {
2371 /* If there is hot_add_disk but no hot_remove_disk
2372 * then added disks for geometry changes,
2373 * and should be added immediately.
2375 super_types
[mddev
->major_version
].
2376 validate_super(mddev
, rdev
);
2377 err
= mddev
->pers
->hot_add_disk(mddev
, rdev
);
2379 unbind_rdev_from_array(rdev
);
2384 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2386 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
2387 if (mddev
->degraded
)
2388 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
2389 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
2390 md_new_event(mddev
);
2391 md_wakeup_thread(mddev
->thread
);
2395 /* words written to sysfs files may, or may not, be \n terminated.
2396 * We want to accept with case. For this we use cmd_match.
2398 static int cmd_match(const char *cmd
, const char *str
)
2400 /* See if cmd, written into a sysfs file, matches
2401 * str. They must either be the same, or cmd can
2402 * have a trailing newline
2404 while (*cmd
&& *str
&& *cmd
== *str
) {
2415 struct rdev_sysfs_entry
{
2416 struct attribute attr
;
2417 ssize_t (*show
)(struct md_rdev
*, char *);
2418 ssize_t (*store
)(struct md_rdev
*, const char *, size_t);
2422 state_show(struct md_rdev
*rdev
, char *page
)
2426 unsigned long flags
= ACCESS_ONCE(rdev
->flags
);
2428 if (test_bit(Faulty
, &flags
) ||
2429 rdev
->badblocks
.unacked_exist
) {
2430 len
+= sprintf(page
+len
, "%sfaulty",sep
);
2433 if (test_bit(In_sync
, &flags
)) {
2434 len
+= sprintf(page
+len
, "%sin_sync",sep
);
2437 if (test_bit(WriteMostly
, &flags
)) {
2438 len
+= sprintf(page
+len
, "%swrite_mostly",sep
);
2441 if (test_bit(Blocked
, &flags
) ||
2442 (rdev
->badblocks
.unacked_exist
2443 && !test_bit(Faulty
, &flags
))) {
2444 len
+= sprintf(page
+len
, "%sblocked", sep
);
2447 if (!test_bit(Faulty
, &flags
) &&
2448 !test_bit(In_sync
, &flags
)) {
2449 len
+= sprintf(page
+len
, "%sspare", sep
);
2452 if (test_bit(WriteErrorSeen
, &flags
)) {
2453 len
+= sprintf(page
+len
, "%swrite_error", sep
);
2456 if (test_bit(WantReplacement
, &flags
)) {
2457 len
+= sprintf(page
+len
, "%swant_replacement", sep
);
2460 if (test_bit(Replacement
, &flags
)) {
2461 len
+= sprintf(page
+len
, "%sreplacement", sep
);
2465 return len
+sprintf(page
+len
, "\n");
2469 state_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2472 * faulty - simulates an error
2473 * remove - disconnects the device
2474 * writemostly - sets write_mostly
2475 * -writemostly - clears write_mostly
2476 * blocked - sets the Blocked flags
2477 * -blocked - clears the Blocked and possibly simulates an error
2478 * insync - sets Insync providing device isn't active
2479 * -insync - clear Insync for a device with a slot assigned,
2480 * so that it gets rebuilt based on bitmap
2481 * write_error - sets WriteErrorSeen
2482 * -write_error - clears WriteErrorSeen
2485 if (cmd_match(buf
, "faulty") && rdev
->mddev
->pers
) {
2486 md_error(rdev
->mddev
, rdev
);
2487 if (test_bit(Faulty
, &rdev
->flags
))
2491 } else if (cmd_match(buf
, "remove")) {
2492 if (rdev
->raid_disk
>= 0)
2495 struct mddev
*mddev
= rdev
->mddev
;
2496 if (mddev_is_clustered(mddev
))
2497 md_cluster_ops
->remove_disk(mddev
, rdev
);
2498 md_kick_rdev_from_array(rdev
);
2499 if (mddev_is_clustered(mddev
))
2500 md_cluster_ops
->metadata_update_start(mddev
);
2502 md_update_sb(mddev
, 1);
2503 md_new_event(mddev
);
2504 if (mddev_is_clustered(mddev
))
2505 md_cluster_ops
->metadata_update_finish(mddev
);
2508 } else if (cmd_match(buf
, "writemostly")) {
2509 set_bit(WriteMostly
, &rdev
->flags
);
2511 } else if (cmd_match(buf
, "-writemostly")) {
2512 clear_bit(WriteMostly
, &rdev
->flags
);
2514 } else if (cmd_match(buf
, "blocked")) {
2515 set_bit(Blocked
, &rdev
->flags
);
2517 } else if (cmd_match(buf
, "-blocked")) {
2518 if (!test_bit(Faulty
, &rdev
->flags
) &&
2519 rdev
->badblocks
.unacked_exist
) {
2520 /* metadata handler doesn't understand badblocks,
2521 * so we need to fail the device
2523 md_error(rdev
->mddev
, rdev
);
2525 clear_bit(Blocked
, &rdev
->flags
);
2526 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2527 wake_up(&rdev
->blocked_wait
);
2528 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2529 md_wakeup_thread(rdev
->mddev
->thread
);
2532 } else if (cmd_match(buf
, "insync") && rdev
->raid_disk
== -1) {
2533 set_bit(In_sync
, &rdev
->flags
);
2535 } else if (cmd_match(buf
, "-insync") && rdev
->raid_disk
>= 0) {
2536 if (rdev
->mddev
->pers
== NULL
) {
2537 clear_bit(In_sync
, &rdev
->flags
);
2538 rdev
->saved_raid_disk
= rdev
->raid_disk
;
2539 rdev
->raid_disk
= -1;
2542 } else if (cmd_match(buf
, "write_error")) {
2543 set_bit(WriteErrorSeen
, &rdev
->flags
);
2545 } else if (cmd_match(buf
, "-write_error")) {
2546 clear_bit(WriteErrorSeen
, &rdev
->flags
);
2548 } else if (cmd_match(buf
, "want_replacement")) {
2549 /* Any non-spare device that is not a replacement can
2550 * become want_replacement at any time, but we then need to
2551 * check if recovery is needed.
2553 if (rdev
->raid_disk
>= 0 &&
2554 !test_bit(Replacement
, &rdev
->flags
))
2555 set_bit(WantReplacement
, &rdev
->flags
);
2556 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2557 md_wakeup_thread(rdev
->mddev
->thread
);
2559 } else if (cmd_match(buf
, "-want_replacement")) {
2560 /* Clearing 'want_replacement' is always allowed.
2561 * Once replacements starts it is too late though.
2564 clear_bit(WantReplacement
, &rdev
->flags
);
2565 } else if (cmd_match(buf
, "replacement")) {
2566 /* Can only set a device as a replacement when array has not
2567 * yet been started. Once running, replacement is automatic
2568 * from spares, or by assigning 'slot'.
2570 if (rdev
->mddev
->pers
)
2573 set_bit(Replacement
, &rdev
->flags
);
2576 } else if (cmd_match(buf
, "-replacement")) {
2577 /* Similarly, can only clear Replacement before start */
2578 if (rdev
->mddev
->pers
)
2581 clear_bit(Replacement
, &rdev
->flags
);
2584 } else if (cmd_match(buf
, "re-add")) {
2585 if (test_bit(Faulty
, &rdev
->flags
) && (rdev
->raid_disk
== -1)) {
2586 /* clear_bit is performed _after_ all the devices
2587 * have their local Faulty bit cleared. If any writes
2588 * happen in the meantime in the local node, they
2589 * will land in the local bitmap, which will be synced
2590 * by this node eventually
2592 if (!mddev_is_clustered(rdev
->mddev
) ||
2593 (err
= md_cluster_ops
->gather_bitmaps(rdev
)) == 0) {
2594 clear_bit(Faulty
, &rdev
->flags
);
2595 err
= add_bound_rdev(rdev
);
2601 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2602 return err
? err
: len
;
2604 static struct rdev_sysfs_entry rdev_state
=
2605 __ATTR_PREALLOC(state
, S_IRUGO
|S_IWUSR
, state_show
, state_store
);
2608 errors_show(struct md_rdev
*rdev
, char *page
)
2610 return sprintf(page
, "%d\n", atomic_read(&rdev
->corrected_errors
));
2614 errors_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2619 rv
= kstrtouint(buf
, 10, &n
);
2622 atomic_set(&rdev
->corrected_errors
, n
);
2625 static struct rdev_sysfs_entry rdev_errors
=
2626 __ATTR(errors
, S_IRUGO
|S_IWUSR
, errors_show
, errors_store
);
2629 slot_show(struct md_rdev
*rdev
, char *page
)
2631 if (rdev
->raid_disk
< 0)
2632 return sprintf(page
, "none\n");
2634 return sprintf(page
, "%d\n", rdev
->raid_disk
);
2638 slot_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2643 if (strncmp(buf
, "none", 4)==0)
2646 err
= kstrtouint(buf
, 10, (unsigned int *)&slot
);
2650 if (rdev
->mddev
->pers
&& slot
== -1) {
2651 /* Setting 'slot' on an active array requires also
2652 * updating the 'rd%d' link, and communicating
2653 * with the personality with ->hot_*_disk.
2654 * For now we only support removing
2655 * failed/spare devices. This normally happens automatically,
2656 * but not when the metadata is externally managed.
2658 if (rdev
->raid_disk
== -1)
2660 /* personality does all needed checks */
2661 if (rdev
->mddev
->pers
->hot_remove_disk
== NULL
)
2663 clear_bit(Blocked
, &rdev
->flags
);
2664 remove_and_add_spares(rdev
->mddev
, rdev
);
2665 if (rdev
->raid_disk
>= 0)
2667 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2668 md_wakeup_thread(rdev
->mddev
->thread
);
2669 } else if (rdev
->mddev
->pers
) {
2670 /* Activating a spare .. or possibly reactivating
2671 * if we ever get bitmaps working here.
2674 if (rdev
->raid_disk
!= -1)
2677 if (test_bit(MD_RECOVERY_RUNNING
, &rdev
->mddev
->recovery
))
2680 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
2683 if (slot
>= rdev
->mddev
->raid_disks
&&
2684 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
2687 rdev
->raid_disk
= slot
;
2688 if (test_bit(In_sync
, &rdev
->flags
))
2689 rdev
->saved_raid_disk
= slot
;
2691 rdev
->saved_raid_disk
= -1;
2692 clear_bit(In_sync
, &rdev
->flags
);
2693 clear_bit(Bitmap_sync
, &rdev
->flags
);
2694 remove_and_add_spares(rdev
->mddev
, rdev
);
2695 if (rdev
->raid_disk
== -1)
2697 /* don't wakeup anyone, leave that to userspace. */
2699 if (slot
>= rdev
->mddev
->raid_disks
&&
2700 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
2702 rdev
->raid_disk
= slot
;
2703 /* assume it is working */
2704 clear_bit(Faulty
, &rdev
->flags
);
2705 clear_bit(WriteMostly
, &rdev
->flags
);
2706 set_bit(In_sync
, &rdev
->flags
);
2707 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2712 static struct rdev_sysfs_entry rdev_slot
=
2713 __ATTR(slot
, S_IRUGO
|S_IWUSR
, slot_show
, slot_store
);
2716 offset_show(struct md_rdev
*rdev
, char *page
)
2718 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->data_offset
);
2722 offset_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2724 unsigned long long offset
;
2725 if (kstrtoull(buf
, 10, &offset
) < 0)
2727 if (rdev
->mddev
->pers
&& rdev
->raid_disk
>= 0)
2729 if (rdev
->sectors
&& rdev
->mddev
->external
)
2730 /* Must set offset before size, so overlap checks
2733 rdev
->data_offset
= offset
;
2734 rdev
->new_data_offset
= offset
;
2738 static struct rdev_sysfs_entry rdev_offset
=
2739 __ATTR(offset
, S_IRUGO
|S_IWUSR
, offset_show
, offset_store
);
2741 static ssize_t
new_offset_show(struct md_rdev
*rdev
, char *page
)
2743 return sprintf(page
, "%llu\n",
2744 (unsigned long long)rdev
->new_data_offset
);
2747 static ssize_t
new_offset_store(struct md_rdev
*rdev
,
2748 const char *buf
, size_t len
)
2750 unsigned long long new_offset
;
2751 struct mddev
*mddev
= rdev
->mddev
;
2753 if (kstrtoull(buf
, 10, &new_offset
) < 0)
2756 if (mddev
->sync_thread
||
2757 test_bit(MD_RECOVERY_RUNNING
,&mddev
->recovery
))
2759 if (new_offset
== rdev
->data_offset
)
2760 /* reset is always permitted */
2762 else if (new_offset
> rdev
->data_offset
) {
2763 /* must not push array size beyond rdev_sectors */
2764 if (new_offset
- rdev
->data_offset
2765 + mddev
->dev_sectors
> rdev
->sectors
)
2768 /* Metadata worries about other space details. */
2770 /* decreasing the offset is inconsistent with a backwards
2773 if (new_offset
< rdev
->data_offset
&&
2774 mddev
->reshape_backwards
)
2776 /* Increasing offset is inconsistent with forwards
2777 * reshape. reshape_direction should be set to
2778 * 'backwards' first.
2780 if (new_offset
> rdev
->data_offset
&&
2781 !mddev
->reshape_backwards
)
2784 if (mddev
->pers
&& mddev
->persistent
&&
2785 !super_types
[mddev
->major_version
]
2786 .allow_new_offset(rdev
, new_offset
))
2788 rdev
->new_data_offset
= new_offset
;
2789 if (new_offset
> rdev
->data_offset
)
2790 mddev
->reshape_backwards
= 1;
2791 else if (new_offset
< rdev
->data_offset
)
2792 mddev
->reshape_backwards
= 0;
2796 static struct rdev_sysfs_entry rdev_new_offset
=
2797 __ATTR(new_offset
, S_IRUGO
|S_IWUSR
, new_offset_show
, new_offset_store
);
2800 rdev_size_show(struct md_rdev
*rdev
, char *page
)
2802 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->sectors
/ 2);
2805 static int overlaps(sector_t s1
, sector_t l1
, sector_t s2
, sector_t l2
)
2807 /* check if two start/length pairs overlap */
2815 static int strict_blocks_to_sectors(const char *buf
, sector_t
*sectors
)
2817 unsigned long long blocks
;
2820 if (kstrtoull(buf
, 10, &blocks
) < 0)
2823 if (blocks
& 1ULL << (8 * sizeof(blocks
) - 1))
2824 return -EINVAL
; /* sector conversion overflow */
2827 if (new != blocks
* 2)
2828 return -EINVAL
; /* unsigned long long to sector_t overflow */
2835 rdev_size_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2837 struct mddev
*my_mddev
= rdev
->mddev
;
2838 sector_t oldsectors
= rdev
->sectors
;
2841 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
2843 if (rdev
->data_offset
!= rdev
->new_data_offset
)
2844 return -EINVAL
; /* too confusing */
2845 if (my_mddev
->pers
&& rdev
->raid_disk
>= 0) {
2846 if (my_mddev
->persistent
) {
2847 sectors
= super_types
[my_mddev
->major_version
].
2848 rdev_size_change(rdev
, sectors
);
2851 } else if (!sectors
)
2852 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) -
2854 if (!my_mddev
->pers
->resize
)
2855 /* Cannot change size for RAID0 or Linear etc */
2858 if (sectors
< my_mddev
->dev_sectors
)
2859 return -EINVAL
; /* component must fit device */
2861 rdev
->sectors
= sectors
;
2862 if (sectors
> oldsectors
&& my_mddev
->external
) {
2863 /* Need to check that all other rdevs with the same
2864 * ->bdev do not overlap. 'rcu' is sufficient to walk
2865 * the rdev lists safely.
2866 * This check does not provide a hard guarantee, it
2867 * just helps avoid dangerous mistakes.
2869 struct mddev
*mddev
;
2871 struct list_head
*tmp
;
2874 for_each_mddev(mddev
, tmp
) {
2875 struct md_rdev
*rdev2
;
2877 rdev_for_each(rdev2
, mddev
)
2878 if (rdev
->bdev
== rdev2
->bdev
&&
2880 overlaps(rdev
->data_offset
, rdev
->sectors
,
2893 /* Someone else could have slipped in a size
2894 * change here, but doing so is just silly.
2895 * We put oldsectors back because we *know* it is
2896 * safe, and trust userspace not to race with
2899 rdev
->sectors
= oldsectors
;
2906 static struct rdev_sysfs_entry rdev_size
=
2907 __ATTR(size
, S_IRUGO
|S_IWUSR
, rdev_size_show
, rdev_size_store
);
2909 static ssize_t
recovery_start_show(struct md_rdev
*rdev
, char *page
)
2911 unsigned long long recovery_start
= rdev
->recovery_offset
;
2913 if (test_bit(In_sync
, &rdev
->flags
) ||
2914 recovery_start
== MaxSector
)
2915 return sprintf(page
, "none\n");
2917 return sprintf(page
, "%llu\n", recovery_start
);
2920 static ssize_t
recovery_start_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2922 unsigned long long recovery_start
;
2924 if (cmd_match(buf
, "none"))
2925 recovery_start
= MaxSector
;
2926 else if (kstrtoull(buf
, 10, &recovery_start
))
2929 if (rdev
->mddev
->pers
&&
2930 rdev
->raid_disk
>= 0)
2933 rdev
->recovery_offset
= recovery_start
;
2934 if (recovery_start
== MaxSector
)
2935 set_bit(In_sync
, &rdev
->flags
);
2937 clear_bit(In_sync
, &rdev
->flags
);
2941 static struct rdev_sysfs_entry rdev_recovery_start
=
2942 __ATTR(recovery_start
, S_IRUGO
|S_IWUSR
, recovery_start_show
, recovery_start_store
);
2945 badblocks_show(struct badblocks
*bb
, char *page
, int unack
);
2947 badblocks_store(struct badblocks
*bb
, const char *page
, size_t len
, int unack
);
2949 static ssize_t
bb_show(struct md_rdev
*rdev
, char *page
)
2951 return badblocks_show(&rdev
->badblocks
, page
, 0);
2953 static ssize_t
bb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
2955 int rv
= badblocks_store(&rdev
->badblocks
, page
, len
, 0);
2956 /* Maybe that ack was all we needed */
2957 if (test_and_clear_bit(BlockedBadBlocks
, &rdev
->flags
))
2958 wake_up(&rdev
->blocked_wait
);
2961 static struct rdev_sysfs_entry rdev_bad_blocks
=
2962 __ATTR(bad_blocks
, S_IRUGO
|S_IWUSR
, bb_show
, bb_store
);
2964 static ssize_t
ubb_show(struct md_rdev
*rdev
, char *page
)
2966 return badblocks_show(&rdev
->badblocks
, page
, 1);
2968 static ssize_t
ubb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
2970 return badblocks_store(&rdev
->badblocks
, page
, len
, 1);
2972 static struct rdev_sysfs_entry rdev_unack_bad_blocks
=
2973 __ATTR(unacknowledged_bad_blocks
, S_IRUGO
|S_IWUSR
, ubb_show
, ubb_store
);
2975 static struct attribute
*rdev_default_attrs
[] = {
2980 &rdev_new_offset
.attr
,
2982 &rdev_recovery_start
.attr
,
2983 &rdev_bad_blocks
.attr
,
2984 &rdev_unack_bad_blocks
.attr
,
2988 rdev_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
2990 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
2991 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
2997 return entry
->show(rdev
, page
);
3001 rdev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
3002 const char *page
, size_t length
)
3004 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
3005 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
3007 struct mddev
*mddev
= rdev
->mddev
;
3011 if (!capable(CAP_SYS_ADMIN
))
3013 rv
= mddev
? mddev_lock(mddev
): -EBUSY
;
3015 if (rdev
->mddev
== NULL
)
3018 rv
= entry
->store(rdev
, page
, length
);
3019 mddev_unlock(mddev
);
3024 static void rdev_free(struct kobject
*ko
)
3026 struct md_rdev
*rdev
= container_of(ko
, struct md_rdev
, kobj
);
3029 static const struct sysfs_ops rdev_sysfs_ops
= {
3030 .show
= rdev_attr_show
,
3031 .store
= rdev_attr_store
,
3033 static struct kobj_type rdev_ktype
= {
3034 .release
= rdev_free
,
3035 .sysfs_ops
= &rdev_sysfs_ops
,
3036 .default_attrs
= rdev_default_attrs
,
3039 int md_rdev_init(struct md_rdev
*rdev
)
3042 rdev
->saved_raid_disk
= -1;
3043 rdev
->raid_disk
= -1;
3045 rdev
->data_offset
= 0;
3046 rdev
->new_data_offset
= 0;
3047 rdev
->sb_events
= 0;
3048 rdev
->last_read_error
.tv_sec
= 0;
3049 rdev
->last_read_error
.tv_nsec
= 0;
3050 rdev
->sb_loaded
= 0;
3051 rdev
->bb_page
= NULL
;
3052 atomic_set(&rdev
->nr_pending
, 0);
3053 atomic_set(&rdev
->read_errors
, 0);
3054 atomic_set(&rdev
->corrected_errors
, 0);
3056 INIT_LIST_HEAD(&rdev
->same_set
);
3057 init_waitqueue_head(&rdev
->blocked_wait
);
3059 /* Add space to store bad block list.
3060 * This reserves the space even on arrays where it cannot
3061 * be used - I wonder if that matters
3063 rdev
->badblocks
.count
= 0;
3064 rdev
->badblocks
.shift
= -1; /* disabled until explicitly enabled */
3065 rdev
->badblocks
.page
= kmalloc(PAGE_SIZE
, GFP_KERNEL
);
3066 seqlock_init(&rdev
->badblocks
.lock
);
3067 if (rdev
->badblocks
.page
== NULL
)
3072 EXPORT_SYMBOL_GPL(md_rdev_init
);
3074 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3076 * mark the device faulty if:
3078 * - the device is nonexistent (zero size)
3079 * - the device has no valid superblock
3081 * a faulty rdev _never_ has rdev->sb set.
3083 static struct md_rdev
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
3085 char b
[BDEVNAME_SIZE
];
3087 struct md_rdev
*rdev
;
3090 rdev
= kzalloc(sizeof(*rdev
), GFP_KERNEL
);
3092 printk(KERN_ERR
"md: could not alloc mem for new device!\n");
3093 return ERR_PTR(-ENOMEM
);
3096 err
= md_rdev_init(rdev
);
3099 err
= alloc_disk_sb(rdev
);
3103 err
= lock_rdev(rdev
, newdev
, super_format
== -2);
3107 kobject_init(&rdev
->kobj
, &rdev_ktype
);
3109 size
= i_size_read(rdev
->bdev
->bd_inode
) >> BLOCK_SIZE_BITS
;
3112 "md: %s has zero or unknown size, marking faulty!\n",
3113 bdevname(rdev
->bdev
,b
));
3118 if (super_format
>= 0) {
3119 err
= super_types
[super_format
].
3120 load_super(rdev
, NULL
, super_minor
);
3121 if (err
== -EINVAL
) {
3123 "md: %s does not have a valid v%d.%d "
3124 "superblock, not importing!\n",
3125 bdevname(rdev
->bdev
,b
),
3126 super_format
, super_minor
);
3131 "md: could not read %s's sb, not importing!\n",
3132 bdevname(rdev
->bdev
,b
));
3142 md_rdev_clear(rdev
);
3144 return ERR_PTR(err
);
3148 * Check a full RAID array for plausibility
3151 static void analyze_sbs(struct mddev
*mddev
)
3154 struct md_rdev
*rdev
, *freshest
, *tmp
;
3155 char b
[BDEVNAME_SIZE
];
3158 rdev_for_each_safe(rdev
, tmp
, mddev
)
3159 switch (super_types
[mddev
->major_version
].
3160 load_super(rdev
, freshest
, mddev
->minor_version
)) {
3168 "md: fatal superblock inconsistency in %s"
3169 " -- removing from array\n",
3170 bdevname(rdev
->bdev
,b
));
3171 md_kick_rdev_from_array(rdev
);
3174 super_types
[mddev
->major_version
].
3175 validate_super(mddev
, freshest
);
3178 rdev_for_each_safe(rdev
, tmp
, mddev
) {
3179 if (mddev
->max_disks
&&
3180 (rdev
->desc_nr
>= mddev
->max_disks
||
3181 i
> mddev
->max_disks
)) {
3183 "md: %s: %s: only %d devices permitted\n",
3184 mdname(mddev
), bdevname(rdev
->bdev
, b
),
3186 md_kick_rdev_from_array(rdev
);
3189 if (rdev
!= freshest
) {
3190 if (super_types
[mddev
->major_version
].
3191 validate_super(mddev
, rdev
)) {
3192 printk(KERN_WARNING
"md: kicking non-fresh %s"
3194 bdevname(rdev
->bdev
,b
));
3195 md_kick_rdev_from_array(rdev
);
3198 /* No device should have a Candidate flag
3199 * when reading devices
3201 if (test_bit(Candidate
, &rdev
->flags
)) {
3202 pr_info("md: kicking Cluster Candidate %s from array!\n",
3203 bdevname(rdev
->bdev
, b
));
3204 md_kick_rdev_from_array(rdev
);
3207 if (mddev
->level
== LEVEL_MULTIPATH
) {
3208 rdev
->desc_nr
= i
++;
3209 rdev
->raid_disk
= rdev
->desc_nr
;
3210 set_bit(In_sync
, &rdev
->flags
);
3211 } else if (rdev
->raid_disk
>= (mddev
->raid_disks
- min(0, mddev
->delta_disks
))) {
3212 rdev
->raid_disk
= -1;
3213 clear_bit(In_sync
, &rdev
->flags
);
3218 /* Read a fixed-point number.
3219 * Numbers in sysfs attributes should be in "standard" units where
3220 * possible, so time should be in seconds.
3221 * However we internally use a a much smaller unit such as
3222 * milliseconds or jiffies.
3223 * This function takes a decimal number with a possible fractional
3224 * component, and produces an integer which is the result of
3225 * multiplying that number by 10^'scale'.
3226 * all without any floating-point arithmetic.
3228 int strict_strtoul_scaled(const char *cp
, unsigned long *res
, int scale
)
3230 unsigned long result
= 0;
3232 while (isdigit(*cp
) || (*cp
== '.' && decimals
< 0)) {
3235 else if (decimals
< scale
) {
3238 result
= result
* 10 + value
;
3250 while (decimals
< scale
) {
3259 safe_delay_show(struct mddev
*mddev
, char *page
)
3261 int msec
= (mddev
->safemode_delay
*1000)/HZ
;
3262 return sprintf(page
, "%d.%03d\n", msec
/1000, msec
%1000);
3265 safe_delay_store(struct mddev
*mddev
, const char *cbuf
, size_t len
)
3269 if (strict_strtoul_scaled(cbuf
, &msec
, 3) < 0)
3272 mddev
->safemode_delay
= 0;
3274 unsigned long old_delay
= mddev
->safemode_delay
;
3275 unsigned long new_delay
= (msec
*HZ
)/1000;
3279 mddev
->safemode_delay
= new_delay
;
3280 if (new_delay
< old_delay
|| old_delay
== 0)
3281 mod_timer(&mddev
->safemode_timer
, jiffies
+1);
3285 static struct md_sysfs_entry md_safe_delay
=
3286 __ATTR(safe_mode_delay
, S_IRUGO
|S_IWUSR
,safe_delay_show
, safe_delay_store
);
3289 level_show(struct mddev
*mddev
, char *page
)
3291 struct md_personality
*p
;
3293 spin_lock(&mddev
->lock
);
3296 ret
= sprintf(page
, "%s\n", p
->name
);
3297 else if (mddev
->clevel
[0])
3298 ret
= sprintf(page
, "%s\n", mddev
->clevel
);
3299 else if (mddev
->level
!= LEVEL_NONE
)
3300 ret
= sprintf(page
, "%d\n", mddev
->level
);
3303 spin_unlock(&mddev
->lock
);
3308 level_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3313 struct md_personality
*pers
, *oldpers
;
3315 void *priv
, *oldpriv
;
3316 struct md_rdev
*rdev
;
3318 if (slen
== 0 || slen
>= sizeof(clevel
))
3321 rv
= mddev_lock(mddev
);
3325 if (mddev
->pers
== NULL
) {
3326 strncpy(mddev
->clevel
, buf
, slen
);
3327 if (mddev
->clevel
[slen
-1] == '\n')
3329 mddev
->clevel
[slen
] = 0;
3330 mddev
->level
= LEVEL_NONE
;
3338 /* request to change the personality. Need to ensure:
3339 * - array is not engaged in resync/recovery/reshape
3340 * - old personality can be suspended
3341 * - new personality will access other array.
3345 if (mddev
->sync_thread
||
3346 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
3347 mddev
->reshape_position
!= MaxSector
||
3348 mddev
->sysfs_active
)
3352 if (!mddev
->pers
->quiesce
) {
3353 printk(KERN_WARNING
"md: %s: %s does not support online personality change\n",
3354 mdname(mddev
), mddev
->pers
->name
);
3358 /* Now find the new personality */
3359 strncpy(clevel
, buf
, slen
);
3360 if (clevel
[slen
-1] == '\n')
3363 if (kstrtol(clevel
, 10, &level
))
3366 if (request_module("md-%s", clevel
) != 0)
3367 request_module("md-level-%s", clevel
);
3368 spin_lock(&pers_lock
);
3369 pers
= find_pers(level
, clevel
);
3370 if (!pers
|| !try_module_get(pers
->owner
)) {
3371 spin_unlock(&pers_lock
);
3372 printk(KERN_WARNING
"md: personality %s not loaded\n", clevel
);
3376 spin_unlock(&pers_lock
);
3378 if (pers
== mddev
->pers
) {
3379 /* Nothing to do! */
3380 module_put(pers
->owner
);
3384 if (!pers
->takeover
) {
3385 module_put(pers
->owner
);
3386 printk(KERN_WARNING
"md: %s: %s does not support personality takeover\n",
3387 mdname(mddev
), clevel
);
3392 rdev_for_each(rdev
, mddev
)
3393 rdev
->new_raid_disk
= rdev
->raid_disk
;
3395 /* ->takeover must set new_* and/or delta_disks
3396 * if it succeeds, and may set them when it fails.
3398 priv
= pers
->takeover(mddev
);
3400 mddev
->new_level
= mddev
->level
;
3401 mddev
->new_layout
= mddev
->layout
;
3402 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3403 mddev
->raid_disks
-= mddev
->delta_disks
;
3404 mddev
->delta_disks
= 0;
3405 mddev
->reshape_backwards
= 0;
3406 module_put(pers
->owner
);
3407 printk(KERN_WARNING
"md: %s: %s would not accept array\n",
3408 mdname(mddev
), clevel
);
3413 /* Looks like we have a winner */
3414 mddev_suspend(mddev
);
3415 mddev_detach(mddev
);
3417 spin_lock(&mddev
->lock
);
3418 oldpers
= mddev
->pers
;
3419 oldpriv
= mddev
->private;
3421 mddev
->private = priv
;
3422 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
3423 mddev
->level
= mddev
->new_level
;
3424 mddev
->layout
= mddev
->new_layout
;
3425 mddev
->chunk_sectors
= mddev
->new_chunk_sectors
;
3426 mddev
->delta_disks
= 0;
3427 mddev
->reshape_backwards
= 0;
3428 mddev
->degraded
= 0;
3429 spin_unlock(&mddev
->lock
);
3431 if (oldpers
->sync_request
== NULL
&&
3433 /* We are converting from a no-redundancy array
3434 * to a redundancy array and metadata is managed
3435 * externally so we need to be sure that writes
3436 * won't block due to a need to transition
3438 * until external management is started.
3441 mddev
->safemode_delay
= 0;
3442 mddev
->safemode
= 0;
3445 oldpers
->free(mddev
, oldpriv
);
3447 if (oldpers
->sync_request
== NULL
&&
3448 pers
->sync_request
!= NULL
) {
3449 /* need to add the md_redundancy_group */
3450 if (sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
3452 "md: cannot register extra attributes for %s\n",
3454 mddev
->sysfs_action
= sysfs_get_dirent(mddev
->kobj
.sd
, "sync_action");
3456 if (oldpers
->sync_request
!= NULL
&&
3457 pers
->sync_request
== NULL
) {
3458 /* need to remove the md_redundancy_group */
3459 if (mddev
->to_remove
== NULL
)
3460 mddev
->to_remove
= &md_redundancy_group
;
3463 rdev_for_each(rdev
, mddev
) {
3464 if (rdev
->raid_disk
< 0)
3466 if (rdev
->new_raid_disk
>= mddev
->raid_disks
)
3467 rdev
->new_raid_disk
= -1;
3468 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3470 sysfs_unlink_rdev(mddev
, rdev
);
3472 rdev_for_each(rdev
, mddev
) {
3473 if (rdev
->raid_disk
< 0)
3475 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3477 rdev
->raid_disk
= rdev
->new_raid_disk
;
3478 if (rdev
->raid_disk
< 0)
3479 clear_bit(In_sync
, &rdev
->flags
);
3481 if (sysfs_link_rdev(mddev
, rdev
))
3482 printk(KERN_WARNING
"md: cannot register rd%d"
3483 " for %s after level change\n",
3484 rdev
->raid_disk
, mdname(mddev
));
3488 if (pers
->sync_request
== NULL
) {
3489 /* this is now an array without redundancy, so
3490 * it must always be in_sync
3493 del_timer_sync(&mddev
->safemode_timer
);
3495 blk_set_stacking_limits(&mddev
->queue
->limits
);
3497 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
3498 mddev_resume(mddev
);
3500 md_update_sb(mddev
, 1);
3501 sysfs_notify(&mddev
->kobj
, NULL
, "level");
3502 md_new_event(mddev
);
3505 mddev_unlock(mddev
);
3509 static struct md_sysfs_entry md_level
=
3510 __ATTR(level
, S_IRUGO
|S_IWUSR
, level_show
, level_store
);
3513 layout_show(struct mddev
*mddev
, char *page
)
3515 /* just a number, not meaningful for all levels */
3516 if (mddev
->reshape_position
!= MaxSector
&&
3517 mddev
->layout
!= mddev
->new_layout
)
3518 return sprintf(page
, "%d (%d)\n",
3519 mddev
->new_layout
, mddev
->layout
);
3520 return sprintf(page
, "%d\n", mddev
->layout
);
3524 layout_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3529 err
= kstrtouint(buf
, 10, &n
);
3532 err
= mddev_lock(mddev
);
3537 if (mddev
->pers
->check_reshape
== NULL
)
3542 mddev
->new_layout
= n
;
3543 err
= mddev
->pers
->check_reshape(mddev
);
3545 mddev
->new_layout
= mddev
->layout
;
3548 mddev
->new_layout
= n
;
3549 if (mddev
->reshape_position
== MaxSector
)
3552 mddev_unlock(mddev
);
3555 static struct md_sysfs_entry md_layout
=
3556 __ATTR(layout
, S_IRUGO
|S_IWUSR
, layout_show
, layout_store
);
3559 raid_disks_show(struct mddev
*mddev
, char *page
)
3561 if (mddev
->raid_disks
== 0)
3563 if (mddev
->reshape_position
!= MaxSector
&&
3564 mddev
->delta_disks
!= 0)
3565 return sprintf(page
, "%d (%d)\n", mddev
->raid_disks
,
3566 mddev
->raid_disks
- mddev
->delta_disks
);
3567 return sprintf(page
, "%d\n", mddev
->raid_disks
);
3570 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
);
3573 raid_disks_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3578 err
= kstrtouint(buf
, 10, &n
);
3582 err
= mddev_lock(mddev
);
3586 err
= update_raid_disks(mddev
, n
);
3587 else if (mddev
->reshape_position
!= MaxSector
) {
3588 struct md_rdev
*rdev
;
3589 int olddisks
= mddev
->raid_disks
- mddev
->delta_disks
;
3592 rdev_for_each(rdev
, mddev
) {
3594 rdev
->data_offset
< rdev
->new_data_offset
)
3597 rdev
->data_offset
> rdev
->new_data_offset
)
3601 mddev
->delta_disks
= n
- olddisks
;
3602 mddev
->raid_disks
= n
;
3603 mddev
->reshape_backwards
= (mddev
->delta_disks
< 0);
3605 mddev
->raid_disks
= n
;
3607 mddev_unlock(mddev
);
3608 return err
? err
: len
;
3610 static struct md_sysfs_entry md_raid_disks
=
3611 __ATTR(raid_disks
, S_IRUGO
|S_IWUSR
, raid_disks_show
, raid_disks_store
);
3614 chunk_size_show(struct mddev
*mddev
, char *page
)
3616 if (mddev
->reshape_position
!= MaxSector
&&
3617 mddev
->chunk_sectors
!= mddev
->new_chunk_sectors
)
3618 return sprintf(page
, "%d (%d)\n",
3619 mddev
->new_chunk_sectors
<< 9,
3620 mddev
->chunk_sectors
<< 9);
3621 return sprintf(page
, "%d\n", mddev
->chunk_sectors
<< 9);
3625 chunk_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3630 err
= kstrtoul(buf
, 10, &n
);
3634 err
= mddev_lock(mddev
);
3638 if (mddev
->pers
->check_reshape
== NULL
)
3643 mddev
->new_chunk_sectors
= n
>> 9;
3644 err
= mddev
->pers
->check_reshape(mddev
);
3646 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3649 mddev
->new_chunk_sectors
= n
>> 9;
3650 if (mddev
->reshape_position
== MaxSector
)
3651 mddev
->chunk_sectors
= n
>> 9;
3653 mddev_unlock(mddev
);
3656 static struct md_sysfs_entry md_chunk_size
=
3657 __ATTR(chunk_size
, S_IRUGO
|S_IWUSR
, chunk_size_show
, chunk_size_store
);
3660 resync_start_show(struct mddev
*mddev
, char *page
)
3662 if (mddev
->recovery_cp
== MaxSector
)
3663 return sprintf(page
, "none\n");
3664 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->recovery_cp
);
3668 resync_start_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3670 unsigned long long n
;
3673 if (cmd_match(buf
, "none"))
3676 err
= kstrtoull(buf
, 10, &n
);
3679 if (n
!= (sector_t
)n
)
3683 err
= mddev_lock(mddev
);
3686 if (mddev
->pers
&& !test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
3690 mddev
->recovery_cp
= n
;
3692 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
3694 mddev_unlock(mddev
);
3697 static struct md_sysfs_entry md_resync_start
=
3698 __ATTR_PREALLOC(resync_start
, S_IRUGO
|S_IWUSR
,
3699 resync_start_show
, resync_start_store
);
3702 * The array state can be:
3705 * No devices, no size, no level
3706 * Equivalent to STOP_ARRAY ioctl
3708 * May have some settings, but array is not active
3709 * all IO results in error
3710 * When written, doesn't tear down array, but just stops it
3711 * suspended (not supported yet)
3712 * All IO requests will block. The array can be reconfigured.
3713 * Writing this, if accepted, will block until array is quiescent
3715 * no resync can happen. no superblocks get written.
3716 * write requests fail
3718 * like readonly, but behaves like 'clean' on a write request.
3720 * clean - no pending writes, but otherwise active.
3721 * When written to inactive array, starts without resync
3722 * If a write request arrives then
3723 * if metadata is known, mark 'dirty' and switch to 'active'.
3724 * if not known, block and switch to write-pending
3725 * If written to an active array that has pending writes, then fails.
3727 * fully active: IO and resync can be happening.
3728 * When written to inactive array, starts with resync
3731 * clean, but writes are blocked waiting for 'active' to be written.
3734 * like active, but no writes have been seen for a while (100msec).
3737 enum array_state
{ clear
, inactive
, suspended
, readonly
, read_auto
, clean
, active
,
3738 write_pending
, active_idle
, bad_word
};
3739 static char *array_states
[] = {
3740 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3741 "write-pending", "active-idle", NULL
};
3743 static int match_word(const char *word
, char **list
)
3746 for (n
=0; list
[n
]; n
++)
3747 if (cmd_match(word
, list
[n
]))
3753 array_state_show(struct mddev
*mddev
, char *page
)
3755 enum array_state st
= inactive
;
3768 else if (test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
3770 else if (mddev
->safemode
)
3776 if (list_empty(&mddev
->disks
) &&
3777 mddev
->raid_disks
== 0 &&
3778 mddev
->dev_sectors
== 0)
3783 return sprintf(page
, "%s\n", array_states
[st
]);
3786 static int do_md_stop(struct mddev
*mddev
, int ro
, struct block_device
*bdev
);
3787 static int md_set_readonly(struct mddev
*mddev
, struct block_device
*bdev
);
3788 static int do_md_run(struct mddev
*mddev
);
3789 static int restart_array(struct mddev
*mddev
);
3792 array_state_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3795 enum array_state st
= match_word(buf
, array_states
);
3797 if (mddev
->pers
&& (st
== active
|| st
== clean
) && mddev
->ro
!= 1) {
3798 /* don't take reconfig_mutex when toggling between
3801 spin_lock(&mddev
->lock
);
3803 restart_array(mddev
);
3804 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
3805 wake_up(&mddev
->sb_wait
);
3807 } else /* st == clean */ {
3808 restart_array(mddev
);
3809 if (atomic_read(&mddev
->writes_pending
) == 0) {
3810 if (mddev
->in_sync
== 0) {
3812 if (mddev
->safemode
== 1)
3813 mddev
->safemode
= 0;
3814 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
3820 spin_unlock(&mddev
->lock
);
3823 err
= mddev_lock(mddev
);
3831 /* stopping an active array */
3832 err
= do_md_stop(mddev
, 0, NULL
);
3835 /* stopping an active array */
3837 err
= do_md_stop(mddev
, 2, NULL
);
3839 err
= 0; /* already inactive */
3842 break; /* not supported yet */
3845 err
= md_set_readonly(mddev
, NULL
);
3848 set_disk_ro(mddev
->gendisk
, 1);
3849 err
= do_md_run(mddev
);
3855 err
= md_set_readonly(mddev
, NULL
);
3856 else if (mddev
->ro
== 1)
3857 err
= restart_array(mddev
);
3860 set_disk_ro(mddev
->gendisk
, 0);
3864 err
= do_md_run(mddev
);
3869 restart_array(mddev
);
3870 spin_lock(&mddev
->lock
);
3871 if (atomic_read(&mddev
->writes_pending
) == 0) {
3872 if (mddev
->in_sync
== 0) {
3874 if (mddev
->safemode
== 1)
3875 mddev
->safemode
= 0;
3876 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
3881 spin_unlock(&mddev
->lock
);
3887 restart_array(mddev
);
3888 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
3889 wake_up(&mddev
->sb_wait
);
3893 set_disk_ro(mddev
->gendisk
, 0);
3894 err
= do_md_run(mddev
);
3899 /* these cannot be set */
3904 if (mddev
->hold_active
== UNTIL_IOCTL
)
3905 mddev
->hold_active
= 0;
3906 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
3908 mddev_unlock(mddev
);
3911 static struct md_sysfs_entry md_array_state
=
3912 __ATTR_PREALLOC(array_state
, S_IRUGO
|S_IWUSR
, array_state_show
, array_state_store
);
3915 max_corrected_read_errors_show(struct mddev
*mddev
, char *page
) {
3916 return sprintf(page
, "%d\n",
3917 atomic_read(&mddev
->max_corr_read_errors
));
3921 max_corrected_read_errors_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3926 rv
= kstrtouint(buf
, 10, &n
);
3929 atomic_set(&mddev
->max_corr_read_errors
, n
);
3933 static struct md_sysfs_entry max_corr_read_errors
=
3934 __ATTR(max_read_errors
, S_IRUGO
|S_IWUSR
, max_corrected_read_errors_show
,
3935 max_corrected_read_errors_store
);
3938 null_show(struct mddev
*mddev
, char *page
)
3944 new_dev_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3946 /* buf must be %d:%d\n? giving major and minor numbers */
3947 /* The new device is added to the array.
3948 * If the array has a persistent superblock, we read the
3949 * superblock to initialise info and check validity.
3950 * Otherwise, only checking done is that in bind_rdev_to_array,
3951 * which mainly checks size.
3954 int major
= simple_strtoul(buf
, &e
, 10);
3957 struct md_rdev
*rdev
;
3960 if (!*buf
|| *e
!= ':' || !e
[1] || e
[1] == '\n')
3962 minor
= simple_strtoul(e
+1, &e
, 10);
3963 if (*e
&& *e
!= '\n')
3965 dev
= MKDEV(major
, minor
);
3966 if (major
!= MAJOR(dev
) ||
3967 minor
!= MINOR(dev
))
3970 flush_workqueue(md_misc_wq
);
3972 err
= mddev_lock(mddev
);
3975 if (mddev
->persistent
) {
3976 rdev
= md_import_device(dev
, mddev
->major_version
,
3977 mddev
->minor_version
);
3978 if (!IS_ERR(rdev
) && !list_empty(&mddev
->disks
)) {
3979 struct md_rdev
*rdev0
3980 = list_entry(mddev
->disks
.next
,
3981 struct md_rdev
, same_set
);
3982 err
= super_types
[mddev
->major_version
]
3983 .load_super(rdev
, rdev0
, mddev
->minor_version
);
3987 } else if (mddev
->external
)
3988 rdev
= md_import_device(dev
, -2, -1);
3990 rdev
= md_import_device(dev
, -1, -1);
3993 mddev_unlock(mddev
);
3994 return PTR_ERR(rdev
);
3996 err
= bind_rdev_to_array(rdev
, mddev
);
4000 mddev_unlock(mddev
);
4001 return err
? err
: len
;
4004 static struct md_sysfs_entry md_new_device
=
4005 __ATTR(new_dev
, S_IWUSR
, null_show
, new_dev_store
);
4008 bitmap_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4011 unsigned long chunk
, end_chunk
;
4014 err
= mddev_lock(mddev
);
4019 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
4021 chunk
= end_chunk
= simple_strtoul(buf
, &end
, 0);
4022 if (buf
== end
) break;
4023 if (*end
== '-') { /* range */
4025 end_chunk
= simple_strtoul(buf
, &end
, 0);
4026 if (buf
== end
) break;
4028 if (*end
&& !isspace(*end
)) break;
4029 bitmap_dirty_bits(mddev
->bitmap
, chunk
, end_chunk
);
4030 buf
= skip_spaces(end
);
4032 bitmap_unplug(mddev
->bitmap
); /* flush the bits to disk */
4034 mddev_unlock(mddev
);
4038 static struct md_sysfs_entry md_bitmap
=
4039 __ATTR(bitmap_set_bits
, S_IWUSR
, null_show
, bitmap_store
);
4042 size_show(struct mddev
*mddev
, char *page
)
4044 return sprintf(page
, "%llu\n",
4045 (unsigned long long)mddev
->dev_sectors
/ 2);
4048 static int update_size(struct mddev
*mddev
, sector_t num_sectors
);
4051 size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4053 /* If array is inactive, we can reduce the component size, but
4054 * not increase it (except from 0).
4055 * If array is active, we can try an on-line resize
4058 int err
= strict_blocks_to_sectors(buf
, §ors
);
4062 err
= mddev_lock(mddev
);
4066 if (mddev_is_clustered(mddev
))
4067 md_cluster_ops
->metadata_update_start(mddev
);
4068 err
= update_size(mddev
, sectors
);
4069 md_update_sb(mddev
, 1);
4070 if (mddev_is_clustered(mddev
))
4071 md_cluster_ops
->metadata_update_finish(mddev
);
4073 if (mddev
->dev_sectors
== 0 ||
4074 mddev
->dev_sectors
> sectors
)
4075 mddev
->dev_sectors
= sectors
;
4079 mddev_unlock(mddev
);
4080 return err
? err
: len
;
4083 static struct md_sysfs_entry md_size
=
4084 __ATTR(component_size
, S_IRUGO
|S_IWUSR
, size_show
, size_store
);
4086 /* Metadata version.
4088 * 'none' for arrays with no metadata (good luck...)
4089 * 'external' for arrays with externally managed metadata,
4090 * or N.M for internally known formats
4093 metadata_show(struct mddev
*mddev
, char *page
)
4095 if (mddev
->persistent
)
4096 return sprintf(page
, "%d.%d\n",
4097 mddev
->major_version
, mddev
->minor_version
);
4098 else if (mddev
->external
)
4099 return sprintf(page
, "external:%s\n", mddev
->metadata_type
);
4101 return sprintf(page
, "none\n");
4105 metadata_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4110 /* Changing the details of 'external' metadata is
4111 * always permitted. Otherwise there must be
4112 * no devices attached to the array.
4115 err
= mddev_lock(mddev
);
4119 if (mddev
->external
&& strncmp(buf
, "external:", 9) == 0)
4121 else if (!list_empty(&mddev
->disks
))
4125 if (cmd_match(buf
, "none")) {
4126 mddev
->persistent
= 0;
4127 mddev
->external
= 0;
4128 mddev
->major_version
= 0;
4129 mddev
->minor_version
= 90;
4132 if (strncmp(buf
, "external:", 9) == 0) {
4133 size_t namelen
= len
-9;
4134 if (namelen
>= sizeof(mddev
->metadata_type
))
4135 namelen
= sizeof(mddev
->metadata_type
)-1;
4136 strncpy(mddev
->metadata_type
, buf
+9, namelen
);
4137 mddev
->metadata_type
[namelen
] = 0;
4138 if (namelen
&& mddev
->metadata_type
[namelen
-1] == '\n')
4139 mddev
->metadata_type
[--namelen
] = 0;
4140 mddev
->persistent
= 0;
4141 mddev
->external
= 1;
4142 mddev
->major_version
= 0;
4143 mddev
->minor_version
= 90;
4146 major
= simple_strtoul(buf
, &e
, 10);
4148 if (e
==buf
|| *e
!= '.')
4151 minor
= simple_strtoul(buf
, &e
, 10);
4152 if (e
==buf
|| (*e
&& *e
!= '\n') )
4155 if (major
>= ARRAY_SIZE(super_types
) || super_types
[major
].name
== NULL
)
4157 mddev
->major_version
= major
;
4158 mddev
->minor_version
= minor
;
4159 mddev
->persistent
= 1;
4160 mddev
->external
= 0;
4163 mddev_unlock(mddev
);
4167 static struct md_sysfs_entry md_metadata
=
4168 __ATTR_PREALLOC(metadata_version
, S_IRUGO
|S_IWUSR
, metadata_show
, metadata_store
);
4171 action_show(struct mddev
*mddev
, char *page
)
4173 char *type
= "idle";
4174 unsigned long recovery
= mddev
->recovery
;
4175 if (test_bit(MD_RECOVERY_FROZEN
, &recovery
))
4177 else if (test_bit(MD_RECOVERY_RUNNING
, &recovery
) ||
4178 (!mddev
->ro
&& test_bit(MD_RECOVERY_NEEDED
, &recovery
))) {
4179 if (test_bit(MD_RECOVERY_RESHAPE
, &recovery
))
4181 else if (test_bit(MD_RECOVERY_SYNC
, &recovery
)) {
4182 if (!test_bit(MD_RECOVERY_REQUESTED
, &recovery
))
4184 else if (test_bit(MD_RECOVERY_CHECK
, &recovery
))
4188 } else if (test_bit(MD_RECOVERY_RECOVER
, &recovery
))
4190 else if (mddev
->reshape_position
!= MaxSector
)
4193 return sprintf(page
, "%s\n", type
);
4197 action_store(struct mddev
*mddev
, const char *page
, size_t len
)
4199 if (!mddev
->pers
|| !mddev
->pers
->sync_request
)
4203 if (cmd_match(page
, "idle") || cmd_match(page
, "frozen")) {
4204 if (cmd_match(page
, "frozen"))
4205 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4207 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4208 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
4209 mddev_lock(mddev
) == 0) {
4210 flush_workqueue(md_misc_wq
);
4211 if (mddev
->sync_thread
) {
4212 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4213 md_reap_sync_thread(mddev
);
4215 mddev_unlock(mddev
);
4217 } else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
4218 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
4220 else if (cmd_match(page
, "resync"))
4221 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4222 else if (cmd_match(page
, "recover")) {
4223 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4224 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
4225 } else if (cmd_match(page
, "reshape")) {
4227 if (mddev
->pers
->start_reshape
== NULL
)
4229 err
= mddev_lock(mddev
);
4231 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4232 err
= mddev
->pers
->start_reshape(mddev
);
4233 mddev_unlock(mddev
);
4237 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
4239 if (cmd_match(page
, "check"))
4240 set_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
4241 else if (!cmd_match(page
, "repair"))
4243 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4244 set_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
4245 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
4247 if (mddev
->ro
== 2) {
4248 /* A write to sync_action is enough to justify
4249 * canceling read-auto mode
4252 md_wakeup_thread(mddev
->sync_thread
);
4254 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4255 md_wakeup_thread(mddev
->thread
);
4256 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
4260 static struct md_sysfs_entry md_scan_mode
=
4261 __ATTR_PREALLOC(sync_action
, S_IRUGO
|S_IWUSR
, action_show
, action_store
);
4264 last_sync_action_show(struct mddev
*mddev
, char *page
)
4266 return sprintf(page
, "%s\n", mddev
->last_sync_action
);
4269 static struct md_sysfs_entry md_last_scan_mode
= __ATTR_RO(last_sync_action
);
4272 mismatch_cnt_show(struct mddev
*mddev
, char *page
)
4274 return sprintf(page
, "%llu\n",
4275 (unsigned long long)
4276 atomic64_read(&mddev
->resync_mismatches
));
4279 static struct md_sysfs_entry md_mismatches
= __ATTR_RO(mismatch_cnt
);
4282 sync_min_show(struct mddev
*mddev
, char *page
)
4284 return sprintf(page
, "%d (%s)\n", speed_min(mddev
),
4285 mddev
->sync_speed_min
? "local": "system");
4289 sync_min_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4294 if (strncmp(buf
, "system", 6)==0) {
4297 rv
= kstrtouint(buf
, 10, &min
);
4303 mddev
->sync_speed_min
= min
;
4307 static struct md_sysfs_entry md_sync_min
=
4308 __ATTR(sync_speed_min
, S_IRUGO
|S_IWUSR
, sync_min_show
, sync_min_store
);
4311 sync_max_show(struct mddev
*mddev
, char *page
)
4313 return sprintf(page
, "%d (%s)\n", speed_max(mddev
),
4314 mddev
->sync_speed_max
? "local": "system");
4318 sync_max_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4323 if (strncmp(buf
, "system", 6)==0) {
4326 rv
= kstrtouint(buf
, 10, &max
);
4332 mddev
->sync_speed_max
= max
;
4336 static struct md_sysfs_entry md_sync_max
=
4337 __ATTR(sync_speed_max
, S_IRUGO
|S_IWUSR
, sync_max_show
, sync_max_store
);
4340 degraded_show(struct mddev
*mddev
, char *page
)
4342 return sprintf(page
, "%d\n", mddev
->degraded
);
4344 static struct md_sysfs_entry md_degraded
= __ATTR_RO(degraded
);
4347 sync_force_parallel_show(struct mddev
*mddev
, char *page
)
4349 return sprintf(page
, "%d\n", mddev
->parallel_resync
);
4353 sync_force_parallel_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4357 if (kstrtol(buf
, 10, &n
))
4360 if (n
!= 0 && n
!= 1)
4363 mddev
->parallel_resync
= n
;
4365 if (mddev
->sync_thread
)
4366 wake_up(&resync_wait
);
4371 /* force parallel resync, even with shared block devices */
4372 static struct md_sysfs_entry md_sync_force_parallel
=
4373 __ATTR(sync_force_parallel
, S_IRUGO
|S_IWUSR
,
4374 sync_force_parallel_show
, sync_force_parallel_store
);
4377 sync_speed_show(struct mddev
*mddev
, char *page
)
4379 unsigned long resync
, dt
, db
;
4380 if (mddev
->curr_resync
== 0)
4381 return sprintf(page
, "none\n");
4382 resync
= mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
);
4383 dt
= (jiffies
- mddev
->resync_mark
) / HZ
;
4385 db
= resync
- mddev
->resync_mark_cnt
;
4386 return sprintf(page
, "%lu\n", db
/dt
/2); /* K/sec */
4389 static struct md_sysfs_entry md_sync_speed
= __ATTR_RO(sync_speed
);
4392 sync_completed_show(struct mddev
*mddev
, char *page
)
4394 unsigned long long max_sectors
, resync
;
4396 if (!test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4397 return sprintf(page
, "none\n");
4399 if (mddev
->curr_resync
== 1 ||
4400 mddev
->curr_resync
== 2)
4401 return sprintf(page
, "delayed\n");
4403 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
4404 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
4405 max_sectors
= mddev
->resync_max_sectors
;
4407 max_sectors
= mddev
->dev_sectors
;
4409 resync
= mddev
->curr_resync_completed
;
4410 return sprintf(page
, "%llu / %llu\n", resync
, max_sectors
);
4413 static struct md_sysfs_entry md_sync_completed
=
4414 __ATTR_PREALLOC(sync_completed
, S_IRUGO
, sync_completed_show
, NULL
);
4417 min_sync_show(struct mddev
*mddev
, char *page
)
4419 return sprintf(page
, "%llu\n",
4420 (unsigned long long)mddev
->resync_min
);
4423 min_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4425 unsigned long long min
;
4428 if (kstrtoull(buf
, 10, &min
))
4431 spin_lock(&mddev
->lock
);
4433 if (min
> mddev
->resync_max
)
4437 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4440 /* Round down to multiple of 4K for safety */
4441 mddev
->resync_min
= round_down(min
, 8);
4445 spin_unlock(&mddev
->lock
);
4449 static struct md_sysfs_entry md_min_sync
=
4450 __ATTR(sync_min
, S_IRUGO
|S_IWUSR
, min_sync_show
, min_sync_store
);
4453 max_sync_show(struct mddev
*mddev
, char *page
)
4455 if (mddev
->resync_max
== MaxSector
)
4456 return sprintf(page
, "max\n");
4458 return sprintf(page
, "%llu\n",
4459 (unsigned long long)mddev
->resync_max
);
4462 max_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4465 spin_lock(&mddev
->lock
);
4466 if (strncmp(buf
, "max", 3) == 0)
4467 mddev
->resync_max
= MaxSector
;
4469 unsigned long long max
;
4473 if (kstrtoull(buf
, 10, &max
))
4475 if (max
< mddev
->resync_min
)
4479 if (max
< mddev
->resync_max
&&
4481 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4484 /* Must be a multiple of chunk_size */
4485 chunk
= mddev
->chunk_sectors
;
4487 sector_t temp
= max
;
4490 if (sector_div(temp
, chunk
))
4493 mddev
->resync_max
= max
;
4495 wake_up(&mddev
->recovery_wait
);
4498 spin_unlock(&mddev
->lock
);
4502 static struct md_sysfs_entry md_max_sync
=
4503 __ATTR(sync_max
, S_IRUGO
|S_IWUSR
, max_sync_show
, max_sync_store
);
4506 suspend_lo_show(struct mddev
*mddev
, char *page
)
4508 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_lo
);
4512 suspend_lo_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4514 unsigned long long old
, new;
4517 err
= kstrtoull(buf
, 10, &new);
4520 if (new != (sector_t
)new)
4523 err
= mddev_lock(mddev
);
4527 if (mddev
->pers
== NULL
||
4528 mddev
->pers
->quiesce
== NULL
)
4530 old
= mddev
->suspend_lo
;
4531 mddev
->suspend_lo
= new;
4533 /* Shrinking suspended region */
4534 mddev
->pers
->quiesce(mddev
, 2);
4536 /* Expanding suspended region - need to wait */
4537 mddev
->pers
->quiesce(mddev
, 1);
4538 mddev
->pers
->quiesce(mddev
, 0);
4542 mddev_unlock(mddev
);
4545 static struct md_sysfs_entry md_suspend_lo
=
4546 __ATTR(suspend_lo
, S_IRUGO
|S_IWUSR
, suspend_lo_show
, suspend_lo_store
);
4549 suspend_hi_show(struct mddev
*mddev
, char *page
)
4551 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_hi
);
4555 suspend_hi_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4557 unsigned long long old
, new;
4560 err
= kstrtoull(buf
, 10, &new);
4563 if (new != (sector_t
)new)
4566 err
= mddev_lock(mddev
);
4570 if (mddev
->pers
== NULL
||
4571 mddev
->pers
->quiesce
== NULL
)
4573 old
= mddev
->suspend_hi
;
4574 mddev
->suspend_hi
= new;
4576 /* Shrinking suspended region */
4577 mddev
->pers
->quiesce(mddev
, 2);
4579 /* Expanding suspended region - need to wait */
4580 mddev
->pers
->quiesce(mddev
, 1);
4581 mddev
->pers
->quiesce(mddev
, 0);
4585 mddev_unlock(mddev
);
4588 static struct md_sysfs_entry md_suspend_hi
=
4589 __ATTR(suspend_hi
, S_IRUGO
|S_IWUSR
, suspend_hi_show
, suspend_hi_store
);
4592 reshape_position_show(struct mddev
*mddev
, char *page
)
4594 if (mddev
->reshape_position
!= MaxSector
)
4595 return sprintf(page
, "%llu\n",
4596 (unsigned long long)mddev
->reshape_position
);
4597 strcpy(page
, "none\n");
4602 reshape_position_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4604 struct md_rdev
*rdev
;
4605 unsigned long long new;
4608 err
= kstrtoull(buf
, 10, &new);
4611 if (new != (sector_t
)new)
4613 err
= mddev_lock(mddev
);
4619 mddev
->reshape_position
= new;
4620 mddev
->delta_disks
= 0;
4621 mddev
->reshape_backwards
= 0;
4622 mddev
->new_level
= mddev
->level
;
4623 mddev
->new_layout
= mddev
->layout
;
4624 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
4625 rdev_for_each(rdev
, mddev
)
4626 rdev
->new_data_offset
= rdev
->data_offset
;
4629 mddev_unlock(mddev
);
4633 static struct md_sysfs_entry md_reshape_position
=
4634 __ATTR(reshape_position
, S_IRUGO
|S_IWUSR
, reshape_position_show
,
4635 reshape_position_store
);
4638 reshape_direction_show(struct mddev
*mddev
, char *page
)
4640 return sprintf(page
, "%s\n",
4641 mddev
->reshape_backwards
? "backwards" : "forwards");
4645 reshape_direction_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4650 if (cmd_match(buf
, "forwards"))
4652 else if (cmd_match(buf
, "backwards"))
4656 if (mddev
->reshape_backwards
== backwards
)
4659 err
= mddev_lock(mddev
);
4662 /* check if we are allowed to change */
4663 if (mddev
->delta_disks
)
4665 else if (mddev
->persistent
&&
4666 mddev
->major_version
== 0)
4669 mddev
->reshape_backwards
= backwards
;
4670 mddev_unlock(mddev
);
4674 static struct md_sysfs_entry md_reshape_direction
=
4675 __ATTR(reshape_direction
, S_IRUGO
|S_IWUSR
, reshape_direction_show
,
4676 reshape_direction_store
);
4679 array_size_show(struct mddev
*mddev
, char *page
)
4681 if (mddev
->external_size
)
4682 return sprintf(page
, "%llu\n",
4683 (unsigned long long)mddev
->array_sectors
/2);
4685 return sprintf(page
, "default\n");
4689 array_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4694 err
= mddev_lock(mddev
);
4698 if (strncmp(buf
, "default", 7) == 0) {
4700 sectors
= mddev
->pers
->size(mddev
, 0, 0);
4702 sectors
= mddev
->array_sectors
;
4704 mddev
->external_size
= 0;
4706 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
4708 else if (mddev
->pers
&& mddev
->pers
->size(mddev
, 0, 0) < sectors
)
4711 mddev
->external_size
= 1;
4715 mddev
->array_sectors
= sectors
;
4717 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
4718 revalidate_disk(mddev
->gendisk
);
4721 mddev_unlock(mddev
);
4725 static struct md_sysfs_entry md_array_size
=
4726 __ATTR(array_size
, S_IRUGO
|S_IWUSR
, array_size_show
,
4729 static struct attribute
*md_default_attrs
[] = {
4732 &md_raid_disks
.attr
,
4733 &md_chunk_size
.attr
,
4735 &md_resync_start
.attr
,
4737 &md_new_device
.attr
,
4738 &md_safe_delay
.attr
,
4739 &md_array_state
.attr
,
4740 &md_reshape_position
.attr
,
4741 &md_reshape_direction
.attr
,
4742 &md_array_size
.attr
,
4743 &max_corr_read_errors
.attr
,
4747 static struct attribute
*md_redundancy_attrs
[] = {
4749 &md_last_scan_mode
.attr
,
4750 &md_mismatches
.attr
,
4753 &md_sync_speed
.attr
,
4754 &md_sync_force_parallel
.attr
,
4755 &md_sync_completed
.attr
,
4758 &md_suspend_lo
.attr
,
4759 &md_suspend_hi
.attr
,
4764 static struct attribute_group md_redundancy_group
= {
4766 .attrs
= md_redundancy_attrs
,
4770 md_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
4772 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4773 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
4778 spin_lock(&all_mddevs_lock
);
4779 if (list_empty(&mddev
->all_mddevs
)) {
4780 spin_unlock(&all_mddevs_lock
);
4784 spin_unlock(&all_mddevs_lock
);
4786 rv
= entry
->show(mddev
, page
);
4792 md_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
4793 const char *page
, size_t length
)
4795 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4796 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
4801 if (!capable(CAP_SYS_ADMIN
))
4803 spin_lock(&all_mddevs_lock
);
4804 if (list_empty(&mddev
->all_mddevs
)) {
4805 spin_unlock(&all_mddevs_lock
);
4809 spin_unlock(&all_mddevs_lock
);
4810 rv
= entry
->store(mddev
, page
, length
);
4815 static void md_free(struct kobject
*ko
)
4817 struct mddev
*mddev
= container_of(ko
, struct mddev
, kobj
);
4819 if (mddev
->sysfs_state
)
4820 sysfs_put(mddev
->sysfs_state
);
4823 blk_cleanup_queue(mddev
->queue
);
4824 if (mddev
->gendisk
) {
4825 del_gendisk(mddev
->gendisk
);
4826 put_disk(mddev
->gendisk
);
4832 static const struct sysfs_ops md_sysfs_ops
= {
4833 .show
= md_attr_show
,
4834 .store
= md_attr_store
,
4836 static struct kobj_type md_ktype
= {
4838 .sysfs_ops
= &md_sysfs_ops
,
4839 .default_attrs
= md_default_attrs
,
4844 static void mddev_delayed_delete(struct work_struct
*ws
)
4846 struct mddev
*mddev
= container_of(ws
, struct mddev
, del_work
);
4848 sysfs_remove_group(&mddev
->kobj
, &md_bitmap_group
);
4849 kobject_del(&mddev
->kobj
);
4850 kobject_put(&mddev
->kobj
);
4853 static int md_alloc(dev_t dev
, char *name
)
4855 static DEFINE_MUTEX(disks_mutex
);
4856 struct mddev
*mddev
= mddev_find(dev
);
4857 struct gendisk
*disk
;
4866 partitioned
= (MAJOR(mddev
->unit
) != MD_MAJOR
);
4867 shift
= partitioned
? MdpMinorShift
: 0;
4868 unit
= MINOR(mddev
->unit
) >> shift
;
4870 /* wait for any previous instance of this device to be
4871 * completely removed (mddev_delayed_delete).
4873 flush_workqueue(md_misc_wq
);
4875 mutex_lock(&disks_mutex
);
4881 /* Need to ensure that 'name' is not a duplicate.
4883 struct mddev
*mddev2
;
4884 spin_lock(&all_mddevs_lock
);
4886 list_for_each_entry(mddev2
, &all_mddevs
, all_mddevs
)
4887 if (mddev2
->gendisk
&&
4888 strcmp(mddev2
->gendisk
->disk_name
, name
) == 0) {
4889 spin_unlock(&all_mddevs_lock
);
4892 spin_unlock(&all_mddevs_lock
);
4896 mddev
->queue
= blk_alloc_queue(GFP_KERNEL
);
4899 mddev
->queue
->queuedata
= mddev
;
4901 blk_queue_make_request(mddev
->queue
, md_make_request
);
4902 blk_set_stacking_limits(&mddev
->queue
->limits
);
4904 disk
= alloc_disk(1 << shift
);
4906 blk_cleanup_queue(mddev
->queue
);
4907 mddev
->queue
= NULL
;
4910 disk
->major
= MAJOR(mddev
->unit
);
4911 disk
->first_minor
= unit
<< shift
;
4913 strcpy(disk
->disk_name
, name
);
4914 else if (partitioned
)
4915 sprintf(disk
->disk_name
, "md_d%d", unit
);
4917 sprintf(disk
->disk_name
, "md%d", unit
);
4918 disk
->fops
= &md_fops
;
4919 disk
->private_data
= mddev
;
4920 disk
->queue
= mddev
->queue
;
4921 blk_queue_flush(mddev
->queue
, REQ_FLUSH
| REQ_FUA
);
4922 /* Allow extended partitions. This makes the
4923 * 'mdp' device redundant, but we can't really
4926 disk
->flags
|= GENHD_FL_EXT_DEVT
;
4927 mddev
->gendisk
= disk
;
4928 /* As soon as we call add_disk(), another thread could get
4929 * through to md_open, so make sure it doesn't get too far
4931 mutex_lock(&mddev
->open_mutex
);
4934 error
= kobject_init_and_add(&mddev
->kobj
, &md_ktype
,
4935 &disk_to_dev(disk
)->kobj
, "%s", "md");
4937 /* This isn't possible, but as kobject_init_and_add is marked
4938 * __must_check, we must do something with the result
4940 printk(KERN_WARNING
"md: cannot register %s/md - name in use\n",
4944 if (mddev
->kobj
.sd
&&
4945 sysfs_create_group(&mddev
->kobj
, &md_bitmap_group
))
4946 printk(KERN_DEBUG
"pointless warning\n");
4947 mutex_unlock(&mddev
->open_mutex
);
4949 mutex_unlock(&disks_mutex
);
4950 if (!error
&& mddev
->kobj
.sd
) {
4951 kobject_uevent(&mddev
->kobj
, KOBJ_ADD
);
4952 mddev
->sysfs_state
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "array_state");
4958 static struct kobject
*md_probe(dev_t dev
, int *part
, void *data
)
4960 md_alloc(dev
, NULL
);
4964 static int add_named_array(const char *val
, struct kernel_param
*kp
)
4966 /* val must be "md_*" where * is not all digits.
4967 * We allocate an array with a large free minor number, and
4968 * set the name to val. val must not already be an active name.
4970 int len
= strlen(val
);
4971 char buf
[DISK_NAME_LEN
];
4973 while (len
&& val
[len
-1] == '\n')
4975 if (len
>= DISK_NAME_LEN
)
4977 strlcpy(buf
, val
, len
+1);
4978 if (strncmp(buf
, "md_", 3) != 0)
4980 return md_alloc(0, buf
);
4983 static void md_safemode_timeout(unsigned long data
)
4985 struct mddev
*mddev
= (struct mddev
*) data
;
4987 if (!atomic_read(&mddev
->writes_pending
)) {
4988 mddev
->safemode
= 1;
4989 if (mddev
->external
)
4990 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4992 md_wakeup_thread(mddev
->thread
);
4995 static int start_dirty_degraded
;
4997 int md_run(struct mddev
*mddev
)
5000 struct md_rdev
*rdev
;
5001 struct md_personality
*pers
;
5003 if (list_empty(&mddev
->disks
))
5004 /* cannot run an array with no devices.. */
5009 /* Cannot run until previous stop completes properly */
5010 if (mddev
->sysfs_active
)
5014 * Analyze all RAID superblock(s)
5016 if (!mddev
->raid_disks
) {
5017 if (!mddev
->persistent
)
5022 if (mddev
->level
!= LEVEL_NONE
)
5023 request_module("md-level-%d", mddev
->level
);
5024 else if (mddev
->clevel
[0])
5025 request_module("md-%s", mddev
->clevel
);
5028 * Drop all container device buffers, from now on
5029 * the only valid external interface is through the md
5032 rdev_for_each(rdev
, mddev
) {
5033 if (test_bit(Faulty
, &rdev
->flags
))
5035 sync_blockdev(rdev
->bdev
);
5036 invalidate_bdev(rdev
->bdev
);
5038 /* perform some consistency tests on the device.
5039 * We don't want the data to overlap the metadata,
5040 * Internal Bitmap issues have been handled elsewhere.
5042 if (rdev
->meta_bdev
) {
5043 /* Nothing to check */;
5044 } else if (rdev
->data_offset
< rdev
->sb_start
) {
5045 if (mddev
->dev_sectors
&&
5046 rdev
->data_offset
+ mddev
->dev_sectors
5048 printk("md: %s: data overlaps metadata\n",
5053 if (rdev
->sb_start
+ rdev
->sb_size
/512
5054 > rdev
->data_offset
) {
5055 printk("md: %s: metadata overlaps data\n",
5060 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
5063 if (mddev
->bio_set
== NULL
)
5064 mddev
->bio_set
= bioset_create(BIO_POOL_SIZE
, 0);
5066 spin_lock(&pers_lock
);
5067 pers
= find_pers(mddev
->level
, mddev
->clevel
);
5068 if (!pers
|| !try_module_get(pers
->owner
)) {
5069 spin_unlock(&pers_lock
);
5070 if (mddev
->level
!= LEVEL_NONE
)
5071 printk(KERN_WARNING
"md: personality for level %d is not loaded!\n",
5074 printk(KERN_WARNING
"md: personality for level %s is not loaded!\n",
5078 spin_unlock(&pers_lock
);
5079 if (mddev
->level
!= pers
->level
) {
5080 mddev
->level
= pers
->level
;
5081 mddev
->new_level
= pers
->level
;
5083 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
5085 if (mddev
->reshape_position
!= MaxSector
&&
5086 pers
->start_reshape
== NULL
) {
5087 /* This personality cannot handle reshaping... */
5088 module_put(pers
->owner
);
5092 if (pers
->sync_request
) {
5093 /* Warn if this is a potentially silly
5096 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
5097 struct md_rdev
*rdev2
;
5100 rdev_for_each(rdev
, mddev
)
5101 rdev_for_each(rdev2
, mddev
) {
5103 rdev
->bdev
->bd_contains
==
5104 rdev2
->bdev
->bd_contains
) {
5106 "%s: WARNING: %s appears to be"
5107 " on the same physical disk as"
5110 bdevname(rdev
->bdev
,b
),
5111 bdevname(rdev2
->bdev
,b2
));
5118 "True protection against single-disk"
5119 " failure might be compromised.\n");
5122 mddev
->recovery
= 0;
5123 /* may be over-ridden by personality */
5124 mddev
->resync_max_sectors
= mddev
->dev_sectors
;
5126 mddev
->ok_start_degraded
= start_dirty_degraded
;
5128 if (start_readonly
&& mddev
->ro
== 0)
5129 mddev
->ro
= 2; /* read-only, but switch on first write */
5131 err
= pers
->run(mddev
);
5133 printk(KERN_ERR
"md: pers->run() failed ...\n");
5134 else if (pers
->size(mddev
, 0, 0) < mddev
->array_sectors
) {
5135 WARN_ONCE(!mddev
->external_size
, "%s: default size too small,"
5136 " but 'external_size' not in effect?\n", __func__
);
5138 "md: invalid array_size %llu > default size %llu\n",
5139 (unsigned long long)mddev
->array_sectors
/ 2,
5140 (unsigned long long)pers
->size(mddev
, 0, 0) / 2);
5143 if (err
== 0 && pers
->sync_request
&&
5144 (mddev
->bitmap_info
.file
|| mddev
->bitmap_info
.offset
)) {
5145 struct bitmap
*bitmap
;
5147 bitmap
= bitmap_create(mddev
, -1);
5148 if (IS_ERR(bitmap
)) {
5149 err
= PTR_ERR(bitmap
);
5150 printk(KERN_ERR
"%s: failed to create bitmap (%d)\n",
5151 mdname(mddev
), err
);
5153 mddev
->bitmap
= bitmap
;
5157 mddev_detach(mddev
);
5159 pers
->free(mddev
, mddev
->private);
5160 mddev
->private = NULL
;
5161 module_put(pers
->owner
);
5162 bitmap_destroy(mddev
);
5166 mddev
->queue
->backing_dev_info
.congested_data
= mddev
;
5167 mddev
->queue
->backing_dev_info
.congested_fn
= md_congested
;
5169 if (pers
->sync_request
) {
5170 if (mddev
->kobj
.sd
&&
5171 sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
5173 "md: cannot register extra attributes for %s\n",
5175 mddev
->sysfs_action
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "sync_action");
5176 } else if (mddev
->ro
== 2) /* auto-readonly not meaningful */
5179 atomic_set(&mddev
->writes_pending
,0);
5180 atomic_set(&mddev
->max_corr_read_errors
,
5181 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS
);
5182 mddev
->safemode
= 0;
5183 mddev
->safemode_delay
= (200 * HZ
)/1000 +1; /* 200 msec delay */
5186 spin_lock(&mddev
->lock
);
5189 spin_unlock(&mddev
->lock
);
5190 rdev_for_each(rdev
, mddev
)
5191 if (rdev
->raid_disk
>= 0)
5192 if (sysfs_link_rdev(mddev
, rdev
))
5193 /* failure here is OK */;
5195 if (mddev
->degraded
&& !mddev
->ro
)
5196 /* This ensures that recovering status is reported immediately
5197 * via sysfs - until a lack of spares is confirmed.
5199 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
5200 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5202 if (mddev
->flags
& MD_UPDATE_SB_FLAGS
)
5203 md_update_sb(mddev
, 0);
5205 md_new_event(mddev
);
5206 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5207 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
5208 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
5211 EXPORT_SYMBOL_GPL(md_run
);
5213 static int do_md_run(struct mddev
*mddev
)
5217 err
= md_run(mddev
);
5220 err
= bitmap_load(mddev
);
5222 bitmap_destroy(mddev
);
5226 md_wakeup_thread(mddev
->thread
);
5227 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
5229 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
5230 revalidate_disk(mddev
->gendisk
);
5232 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
5237 static int restart_array(struct mddev
*mddev
)
5239 struct gendisk
*disk
= mddev
->gendisk
;
5241 /* Complain if it has no devices */
5242 if (list_empty(&mddev
->disks
))
5248 mddev
->safemode
= 0;
5250 set_disk_ro(disk
, 0);
5251 printk(KERN_INFO
"md: %s switched to read-write mode.\n",
5253 /* Kick recovery or resync if necessary */
5254 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5255 md_wakeup_thread(mddev
->thread
);
5256 md_wakeup_thread(mddev
->sync_thread
);
5257 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5261 static void md_clean(struct mddev
*mddev
)
5263 mddev
->array_sectors
= 0;
5264 mddev
->external_size
= 0;
5265 mddev
->dev_sectors
= 0;
5266 mddev
->raid_disks
= 0;
5267 mddev
->recovery_cp
= 0;
5268 mddev
->resync_min
= 0;
5269 mddev
->resync_max
= MaxSector
;
5270 mddev
->reshape_position
= MaxSector
;
5271 mddev
->external
= 0;
5272 mddev
->persistent
= 0;
5273 mddev
->level
= LEVEL_NONE
;
5274 mddev
->clevel
[0] = 0;
5277 mddev
->metadata_type
[0] = 0;
5278 mddev
->chunk_sectors
= 0;
5279 mddev
->ctime
= mddev
->utime
= 0;
5281 mddev
->max_disks
= 0;
5283 mddev
->can_decrease_events
= 0;
5284 mddev
->delta_disks
= 0;
5285 mddev
->reshape_backwards
= 0;
5286 mddev
->new_level
= LEVEL_NONE
;
5287 mddev
->new_layout
= 0;
5288 mddev
->new_chunk_sectors
= 0;
5289 mddev
->curr_resync
= 0;
5290 atomic64_set(&mddev
->resync_mismatches
, 0);
5291 mddev
->suspend_lo
= mddev
->suspend_hi
= 0;
5292 mddev
->sync_speed_min
= mddev
->sync_speed_max
= 0;
5293 mddev
->recovery
= 0;
5296 mddev
->degraded
= 0;
5297 mddev
->safemode
= 0;
5298 mddev
->private = NULL
;
5299 mddev
->bitmap_info
.offset
= 0;
5300 mddev
->bitmap_info
.default_offset
= 0;
5301 mddev
->bitmap_info
.default_space
= 0;
5302 mddev
->bitmap_info
.chunksize
= 0;
5303 mddev
->bitmap_info
.daemon_sleep
= 0;
5304 mddev
->bitmap_info
.max_write_behind
= 0;
5307 static void __md_stop_writes(struct mddev
*mddev
)
5309 if (mddev_is_clustered(mddev
))
5310 md_cluster_ops
->metadata_update_start(mddev
);
5311 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5312 flush_workqueue(md_misc_wq
);
5313 if (mddev
->sync_thread
) {
5314 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5315 md_reap_sync_thread(mddev
);
5318 del_timer_sync(&mddev
->safemode_timer
);
5320 bitmap_flush(mddev
);
5321 md_super_wait(mddev
);
5323 if (mddev
->ro
== 0 &&
5324 (!mddev
->in_sync
|| (mddev
->flags
& MD_UPDATE_SB_FLAGS
))) {
5325 /* mark array as shutdown cleanly */
5327 md_update_sb(mddev
, 1);
5329 if (mddev_is_clustered(mddev
))
5330 md_cluster_ops
->metadata_update_finish(mddev
);
5333 void md_stop_writes(struct mddev
*mddev
)
5335 mddev_lock_nointr(mddev
);
5336 __md_stop_writes(mddev
);
5337 mddev_unlock(mddev
);
5339 EXPORT_SYMBOL_GPL(md_stop_writes
);
5341 static void mddev_detach(struct mddev
*mddev
)
5343 struct bitmap
*bitmap
= mddev
->bitmap
;
5344 /* wait for behind writes to complete */
5345 if (bitmap
&& atomic_read(&bitmap
->behind_writes
) > 0) {
5346 printk(KERN_INFO
"md:%s: behind writes in progress - waiting to stop.\n",
5348 /* need to kick something here to make sure I/O goes? */
5349 wait_event(bitmap
->behind_wait
,
5350 atomic_read(&bitmap
->behind_writes
) == 0);
5352 if (mddev
->pers
&& mddev
->pers
->quiesce
) {
5353 mddev
->pers
->quiesce(mddev
, 1);
5354 mddev
->pers
->quiesce(mddev
, 0);
5356 md_unregister_thread(&mddev
->thread
);
5358 blk_sync_queue(mddev
->queue
); /* the unplug fn references 'conf'*/
5361 static void __md_stop(struct mddev
*mddev
)
5363 struct md_personality
*pers
= mddev
->pers
;
5364 mddev_detach(mddev
);
5365 /* Ensure ->event_work is done */
5366 flush_workqueue(md_misc_wq
);
5367 spin_lock(&mddev
->lock
);
5370 spin_unlock(&mddev
->lock
);
5371 pers
->free(mddev
, mddev
->private);
5372 mddev
->private = NULL
;
5373 if (pers
->sync_request
&& mddev
->to_remove
== NULL
)
5374 mddev
->to_remove
= &md_redundancy_group
;
5375 module_put(pers
->owner
);
5376 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5379 void md_stop(struct mddev
*mddev
)
5381 /* stop the array and free an attached data structures.
5382 * This is called from dm-raid
5385 bitmap_destroy(mddev
);
5387 bioset_free(mddev
->bio_set
);
5390 EXPORT_SYMBOL_GPL(md_stop
);
5392 static int md_set_readonly(struct mddev
*mddev
, struct block_device
*bdev
)
5397 if (!test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
)) {
5399 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5400 md_wakeup_thread(mddev
->thread
);
5402 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
5403 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5404 if (mddev
->sync_thread
)
5405 /* Thread might be blocked waiting for metadata update
5406 * which will now never happen */
5407 wake_up_process(mddev
->sync_thread
->tsk
);
5409 if (mddev
->external
&& test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
5411 mddev_unlock(mddev
);
5412 wait_event(resync_wait
, !test_bit(MD_RECOVERY_RUNNING
,
5414 wait_event(mddev
->sb_wait
,
5415 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
5416 mddev_lock_nointr(mddev
);
5418 mutex_lock(&mddev
->open_mutex
);
5419 if ((mddev
->pers
&& atomic_read(&mddev
->openers
) > !!bdev
) ||
5420 mddev
->sync_thread
||
5421 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
5422 (bdev
&& !test_bit(MD_STILL_CLOSED
, &mddev
->flags
))) {
5423 printk("md: %s still in use.\n",mdname(mddev
));
5425 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5426 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5427 md_wakeup_thread(mddev
->thread
);
5433 __md_stop_writes(mddev
);
5439 set_disk_ro(mddev
->gendisk
, 1);
5440 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5441 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5442 md_wakeup_thread(mddev
->thread
);
5443 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5447 mutex_unlock(&mddev
->open_mutex
);
5452 * 0 - completely stop and dis-assemble array
5453 * 2 - stop but do not disassemble array
5455 static int do_md_stop(struct mddev
*mddev
, int mode
,
5456 struct block_device
*bdev
)
5458 struct gendisk
*disk
= mddev
->gendisk
;
5459 struct md_rdev
*rdev
;
5462 if (!test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
)) {
5464 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5465 md_wakeup_thread(mddev
->thread
);
5467 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
5468 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5469 if (mddev
->sync_thread
)
5470 /* Thread might be blocked waiting for metadata update
5471 * which will now never happen */
5472 wake_up_process(mddev
->sync_thread
->tsk
);
5474 mddev_unlock(mddev
);
5475 wait_event(resync_wait
, (mddev
->sync_thread
== NULL
&&
5476 !test_bit(MD_RECOVERY_RUNNING
,
5477 &mddev
->recovery
)));
5478 mddev_lock_nointr(mddev
);
5480 mutex_lock(&mddev
->open_mutex
);
5481 if ((mddev
->pers
&& atomic_read(&mddev
->openers
) > !!bdev
) ||
5482 mddev
->sysfs_active
||
5483 mddev
->sync_thread
||
5484 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
5485 (bdev
&& !test_bit(MD_STILL_CLOSED
, &mddev
->flags
))) {
5486 printk("md: %s still in use.\n",mdname(mddev
));
5487 mutex_unlock(&mddev
->open_mutex
);
5489 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5490 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5491 md_wakeup_thread(mddev
->thread
);
5497 set_disk_ro(disk
, 0);
5499 __md_stop_writes(mddev
);
5501 mddev
->queue
->backing_dev_info
.congested_fn
= NULL
;
5503 /* tell userspace to handle 'inactive' */
5504 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5506 rdev_for_each(rdev
, mddev
)
5507 if (rdev
->raid_disk
>= 0)
5508 sysfs_unlink_rdev(mddev
, rdev
);
5510 set_capacity(disk
, 0);
5511 mutex_unlock(&mddev
->open_mutex
);
5513 revalidate_disk(disk
);
5518 mutex_unlock(&mddev
->open_mutex
);
5520 * Free resources if final stop
5523 printk(KERN_INFO
"md: %s stopped.\n", mdname(mddev
));
5525 bitmap_destroy(mddev
);
5526 if (mddev
->bitmap_info
.file
) {
5527 struct file
*f
= mddev
->bitmap_info
.file
;
5528 spin_lock(&mddev
->lock
);
5529 mddev
->bitmap_info
.file
= NULL
;
5530 spin_unlock(&mddev
->lock
);
5533 mddev
->bitmap_info
.offset
= 0;
5535 export_array(mddev
);
5538 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
5539 if (mddev
->hold_active
== UNTIL_STOP
)
5540 mddev
->hold_active
= 0;
5542 blk_integrity_unregister(disk
);
5543 md_new_event(mddev
);
5544 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5549 static void autorun_array(struct mddev
*mddev
)
5551 struct md_rdev
*rdev
;
5554 if (list_empty(&mddev
->disks
))
5557 printk(KERN_INFO
"md: running: ");
5559 rdev_for_each(rdev
, mddev
) {
5560 char b
[BDEVNAME_SIZE
];
5561 printk("<%s>", bdevname(rdev
->bdev
,b
));
5565 err
= do_md_run(mddev
);
5567 printk(KERN_WARNING
"md: do_md_run() returned %d\n", err
);
5568 do_md_stop(mddev
, 0, NULL
);
5573 * lets try to run arrays based on all disks that have arrived
5574 * until now. (those are in pending_raid_disks)
5576 * the method: pick the first pending disk, collect all disks with
5577 * the same UUID, remove all from the pending list and put them into
5578 * the 'same_array' list. Then order this list based on superblock
5579 * update time (freshest comes first), kick out 'old' disks and
5580 * compare superblocks. If everything's fine then run it.
5582 * If "unit" is allocated, then bump its reference count
5584 static void autorun_devices(int part
)
5586 struct md_rdev
*rdev0
, *rdev
, *tmp
;
5587 struct mddev
*mddev
;
5588 char b
[BDEVNAME_SIZE
];
5590 printk(KERN_INFO
"md: autorun ...\n");
5591 while (!list_empty(&pending_raid_disks
)) {
5594 LIST_HEAD(candidates
);
5595 rdev0
= list_entry(pending_raid_disks
.next
,
5596 struct md_rdev
, same_set
);
5598 printk(KERN_INFO
"md: considering %s ...\n",
5599 bdevname(rdev0
->bdev
,b
));
5600 INIT_LIST_HEAD(&candidates
);
5601 rdev_for_each_list(rdev
, tmp
, &pending_raid_disks
)
5602 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
5603 printk(KERN_INFO
"md: adding %s ...\n",
5604 bdevname(rdev
->bdev
,b
));
5605 list_move(&rdev
->same_set
, &candidates
);
5608 * now we have a set of devices, with all of them having
5609 * mostly sane superblocks. It's time to allocate the
5613 dev
= MKDEV(mdp_major
,
5614 rdev0
->preferred_minor
<< MdpMinorShift
);
5615 unit
= MINOR(dev
) >> MdpMinorShift
;
5617 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
5620 if (rdev0
->preferred_minor
!= unit
) {
5621 printk(KERN_INFO
"md: unit number in %s is bad: %d\n",
5622 bdevname(rdev0
->bdev
, b
), rdev0
->preferred_minor
);
5626 md_probe(dev
, NULL
, NULL
);
5627 mddev
= mddev_find(dev
);
5628 if (!mddev
|| !mddev
->gendisk
) {
5632 "md: cannot allocate memory for md drive.\n");
5635 if (mddev_lock(mddev
))
5636 printk(KERN_WARNING
"md: %s locked, cannot run\n",
5638 else if (mddev
->raid_disks
|| mddev
->major_version
5639 || !list_empty(&mddev
->disks
)) {
5641 "md: %s already running, cannot run %s\n",
5642 mdname(mddev
), bdevname(rdev0
->bdev
,b
));
5643 mddev_unlock(mddev
);
5645 printk(KERN_INFO
"md: created %s\n", mdname(mddev
));
5646 mddev
->persistent
= 1;
5647 rdev_for_each_list(rdev
, tmp
, &candidates
) {
5648 list_del_init(&rdev
->same_set
);
5649 if (bind_rdev_to_array(rdev
, mddev
))
5652 autorun_array(mddev
);
5653 mddev_unlock(mddev
);
5655 /* on success, candidates will be empty, on error
5658 rdev_for_each_list(rdev
, tmp
, &candidates
) {
5659 list_del_init(&rdev
->same_set
);
5664 printk(KERN_INFO
"md: ... autorun DONE.\n");
5666 #endif /* !MODULE */
5668 static int get_version(void __user
*arg
)
5672 ver
.major
= MD_MAJOR_VERSION
;
5673 ver
.minor
= MD_MINOR_VERSION
;
5674 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
5676 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
5682 static int get_array_info(struct mddev
*mddev
, void __user
*arg
)
5684 mdu_array_info_t info
;
5685 int nr
,working
,insync
,failed
,spare
;
5686 struct md_rdev
*rdev
;
5688 nr
= working
= insync
= failed
= spare
= 0;
5690 rdev_for_each_rcu(rdev
, mddev
) {
5692 if (test_bit(Faulty
, &rdev
->flags
))
5696 if (test_bit(In_sync
, &rdev
->flags
))
5704 info
.major_version
= mddev
->major_version
;
5705 info
.minor_version
= mddev
->minor_version
;
5706 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
5707 info
.ctime
= mddev
->ctime
;
5708 info
.level
= mddev
->level
;
5709 info
.size
= mddev
->dev_sectors
/ 2;
5710 if (info
.size
!= mddev
->dev_sectors
/ 2) /* overflow */
5713 info
.raid_disks
= mddev
->raid_disks
;
5714 info
.md_minor
= mddev
->md_minor
;
5715 info
.not_persistent
= !mddev
->persistent
;
5717 info
.utime
= mddev
->utime
;
5720 info
.state
= (1<<MD_SB_CLEAN
);
5721 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
5722 info
.state
|= (1<<MD_SB_BITMAP_PRESENT
);
5723 if (mddev_is_clustered(mddev
))
5724 info
.state
|= (1<<MD_SB_CLUSTERED
);
5725 info
.active_disks
= insync
;
5726 info
.working_disks
= working
;
5727 info
.failed_disks
= failed
;
5728 info
.spare_disks
= spare
;
5730 info
.layout
= mddev
->layout
;
5731 info
.chunk_size
= mddev
->chunk_sectors
<< 9;
5733 if (copy_to_user(arg
, &info
, sizeof(info
)))
5739 static int get_bitmap_file(struct mddev
*mddev
, void __user
* arg
)
5741 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
5745 file
= kzalloc(sizeof(*file
), GFP_NOIO
);
5750 spin_lock(&mddev
->lock
);
5751 /* bitmap enabled */
5752 if (mddev
->bitmap_info
.file
) {
5753 ptr
= file_path(mddev
->bitmap_info
.file
, file
->pathname
,
5754 sizeof(file
->pathname
));
5758 memmove(file
->pathname
, ptr
,
5759 sizeof(file
->pathname
)-(ptr
-file
->pathname
));
5761 spin_unlock(&mddev
->lock
);
5764 copy_to_user(arg
, file
, sizeof(*file
)))
5771 static int get_disk_info(struct mddev
*mddev
, void __user
* arg
)
5773 mdu_disk_info_t info
;
5774 struct md_rdev
*rdev
;
5776 if (copy_from_user(&info
, arg
, sizeof(info
)))
5780 rdev
= md_find_rdev_nr_rcu(mddev
, info
.number
);
5782 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
5783 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
5784 info
.raid_disk
= rdev
->raid_disk
;
5786 if (test_bit(Faulty
, &rdev
->flags
))
5787 info
.state
|= (1<<MD_DISK_FAULTY
);
5788 else if (test_bit(In_sync
, &rdev
->flags
)) {
5789 info
.state
|= (1<<MD_DISK_ACTIVE
);
5790 info
.state
|= (1<<MD_DISK_SYNC
);
5792 if (test_bit(WriteMostly
, &rdev
->flags
))
5793 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
5795 info
.major
= info
.minor
= 0;
5796 info
.raid_disk
= -1;
5797 info
.state
= (1<<MD_DISK_REMOVED
);
5801 if (copy_to_user(arg
, &info
, sizeof(info
)))
5807 static int add_new_disk(struct mddev
*mddev
, mdu_disk_info_t
*info
)
5809 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
5810 struct md_rdev
*rdev
;
5811 dev_t dev
= MKDEV(info
->major
,info
->minor
);
5813 if (mddev_is_clustered(mddev
) &&
5814 !(info
->state
& ((1 << MD_DISK_CLUSTER_ADD
) | (1 << MD_DISK_CANDIDATE
)))) {
5815 pr_err("%s: Cannot add to clustered mddev.\n",
5820 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
5823 if (!mddev
->raid_disks
) {
5825 /* expecting a device which has a superblock */
5826 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
5829 "md: md_import_device returned %ld\n",
5831 return PTR_ERR(rdev
);
5833 if (!list_empty(&mddev
->disks
)) {
5834 struct md_rdev
*rdev0
5835 = list_entry(mddev
->disks
.next
,
5836 struct md_rdev
, same_set
);
5837 err
= super_types
[mddev
->major_version
]
5838 .load_super(rdev
, rdev0
, mddev
->minor_version
);
5841 "md: %s has different UUID to %s\n",
5842 bdevname(rdev
->bdev
,b
),
5843 bdevname(rdev0
->bdev
,b2
));
5848 err
= bind_rdev_to_array(rdev
, mddev
);
5855 * add_new_disk can be used once the array is assembled
5856 * to add "hot spares". They must already have a superblock
5861 if (!mddev
->pers
->hot_add_disk
) {
5863 "%s: personality does not support diskops!\n",
5867 if (mddev
->persistent
)
5868 rdev
= md_import_device(dev
, mddev
->major_version
,
5869 mddev
->minor_version
);
5871 rdev
= md_import_device(dev
, -1, -1);
5874 "md: md_import_device returned %ld\n",
5876 return PTR_ERR(rdev
);
5878 /* set saved_raid_disk if appropriate */
5879 if (!mddev
->persistent
) {
5880 if (info
->state
& (1<<MD_DISK_SYNC
) &&
5881 info
->raid_disk
< mddev
->raid_disks
) {
5882 rdev
->raid_disk
= info
->raid_disk
;
5883 set_bit(In_sync
, &rdev
->flags
);
5884 clear_bit(Bitmap_sync
, &rdev
->flags
);
5886 rdev
->raid_disk
= -1;
5887 rdev
->saved_raid_disk
= rdev
->raid_disk
;
5889 super_types
[mddev
->major_version
].
5890 validate_super(mddev
, rdev
);
5891 if ((info
->state
& (1<<MD_DISK_SYNC
)) &&
5892 rdev
->raid_disk
!= info
->raid_disk
) {
5893 /* This was a hot-add request, but events doesn't
5894 * match, so reject it.
5900 clear_bit(In_sync
, &rdev
->flags
); /* just to be sure */
5901 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
5902 set_bit(WriteMostly
, &rdev
->flags
);
5904 clear_bit(WriteMostly
, &rdev
->flags
);
5907 * check whether the device shows up in other nodes
5909 if (mddev_is_clustered(mddev
)) {
5910 if (info
->state
& (1 << MD_DISK_CANDIDATE
)) {
5911 /* Through --cluster-confirm */
5912 set_bit(Candidate
, &rdev
->flags
);
5913 err
= md_cluster_ops
->new_disk_ack(mddev
, true);
5918 } else if (info
->state
& (1 << MD_DISK_CLUSTER_ADD
)) {
5919 /* --add initiated by this node */
5920 err
= md_cluster_ops
->add_new_disk_start(mddev
, rdev
);
5922 md_cluster_ops
->add_new_disk_finish(mddev
);
5929 rdev
->raid_disk
= -1;
5930 err
= bind_rdev_to_array(rdev
, mddev
);
5934 err
= add_bound_rdev(rdev
);
5935 if (mddev_is_clustered(mddev
) &&
5936 (info
->state
& (1 << MD_DISK_CLUSTER_ADD
)))
5937 md_cluster_ops
->add_new_disk_finish(mddev
);
5941 /* otherwise, add_new_disk is only allowed
5942 * for major_version==0 superblocks
5944 if (mddev
->major_version
!= 0) {
5945 printk(KERN_WARNING
"%s: ADD_NEW_DISK not supported\n",
5950 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
5952 rdev
= md_import_device(dev
, -1, 0);
5955 "md: error, md_import_device() returned %ld\n",
5957 return PTR_ERR(rdev
);
5959 rdev
->desc_nr
= info
->number
;
5960 if (info
->raid_disk
< mddev
->raid_disks
)
5961 rdev
->raid_disk
= info
->raid_disk
;
5963 rdev
->raid_disk
= -1;
5965 if (rdev
->raid_disk
< mddev
->raid_disks
)
5966 if (info
->state
& (1<<MD_DISK_SYNC
))
5967 set_bit(In_sync
, &rdev
->flags
);
5969 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
5970 set_bit(WriteMostly
, &rdev
->flags
);
5972 if (!mddev
->persistent
) {
5973 printk(KERN_INFO
"md: nonpersistent superblock ...\n");
5974 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
5976 rdev
->sb_start
= calc_dev_sboffset(rdev
);
5977 rdev
->sectors
= rdev
->sb_start
;
5979 err
= bind_rdev_to_array(rdev
, mddev
);
5989 static int hot_remove_disk(struct mddev
*mddev
, dev_t dev
)
5991 char b
[BDEVNAME_SIZE
];
5992 struct md_rdev
*rdev
;
5994 rdev
= find_rdev(mddev
, dev
);
5998 if (mddev_is_clustered(mddev
))
5999 md_cluster_ops
->metadata_update_start(mddev
);
6001 if (rdev
->raid_disk
< 0)
6004 clear_bit(Blocked
, &rdev
->flags
);
6005 remove_and_add_spares(mddev
, rdev
);
6007 if (rdev
->raid_disk
>= 0)
6011 if (mddev_is_clustered(mddev
))
6012 md_cluster_ops
->remove_disk(mddev
, rdev
);
6014 md_kick_rdev_from_array(rdev
);
6015 md_update_sb(mddev
, 1);
6016 md_new_event(mddev
);
6018 if (mddev_is_clustered(mddev
))
6019 md_cluster_ops
->metadata_update_finish(mddev
);
6023 if (mddev_is_clustered(mddev
))
6024 md_cluster_ops
->metadata_update_cancel(mddev
);
6026 printk(KERN_WARNING
"md: cannot remove active disk %s from %s ...\n",
6027 bdevname(rdev
->bdev
,b
), mdname(mddev
));
6031 static int hot_add_disk(struct mddev
*mddev
, dev_t dev
)
6033 char b
[BDEVNAME_SIZE
];
6035 struct md_rdev
*rdev
;
6040 if (mddev
->major_version
!= 0) {
6041 printk(KERN_WARNING
"%s: HOT_ADD may only be used with"
6042 " version-0 superblocks.\n",
6046 if (!mddev
->pers
->hot_add_disk
) {
6048 "%s: personality does not support diskops!\n",
6053 rdev
= md_import_device(dev
, -1, 0);
6056 "md: error, md_import_device() returned %ld\n",
6061 if (mddev
->persistent
)
6062 rdev
->sb_start
= calc_dev_sboffset(rdev
);
6064 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
6066 rdev
->sectors
= rdev
->sb_start
;
6068 if (test_bit(Faulty
, &rdev
->flags
)) {
6070 "md: can not hot-add faulty %s disk to %s!\n",
6071 bdevname(rdev
->bdev
,b
), mdname(mddev
));
6076 if (mddev_is_clustered(mddev
))
6077 md_cluster_ops
->metadata_update_start(mddev
);
6078 clear_bit(In_sync
, &rdev
->flags
);
6080 rdev
->saved_raid_disk
= -1;
6081 err
= bind_rdev_to_array(rdev
, mddev
);
6083 goto abort_clustered
;
6086 * The rest should better be atomic, we can have disk failures
6087 * noticed in interrupt contexts ...
6090 rdev
->raid_disk
= -1;
6092 md_update_sb(mddev
, 1);
6094 if (mddev_is_clustered(mddev
))
6095 md_cluster_ops
->metadata_update_finish(mddev
);
6097 * Kick recovery, maybe this spare has to be added to the
6098 * array immediately.
6100 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6101 md_wakeup_thread(mddev
->thread
);
6102 md_new_event(mddev
);
6106 if (mddev_is_clustered(mddev
))
6107 md_cluster_ops
->metadata_update_cancel(mddev
);
6113 static int set_bitmap_file(struct mddev
*mddev
, int fd
)
6118 if (!mddev
->pers
->quiesce
|| !mddev
->thread
)
6120 if (mddev
->recovery
|| mddev
->sync_thread
)
6122 /* we should be able to change the bitmap.. */
6126 struct inode
*inode
;
6129 if (mddev
->bitmap
|| mddev
->bitmap_info
.file
)
6130 return -EEXIST
; /* cannot add when bitmap is present */
6134 printk(KERN_ERR
"%s: error: failed to get bitmap file\n",
6139 inode
= f
->f_mapping
->host
;
6140 if (!S_ISREG(inode
->i_mode
)) {
6141 printk(KERN_ERR
"%s: error: bitmap file must be a regular file\n",
6144 } else if (!(f
->f_mode
& FMODE_WRITE
)) {
6145 printk(KERN_ERR
"%s: error: bitmap file must open for write\n",
6148 } else if (atomic_read(&inode
->i_writecount
) != 1) {
6149 printk(KERN_ERR
"%s: error: bitmap file is already in use\n",
6157 mddev
->bitmap_info
.file
= f
;
6158 mddev
->bitmap_info
.offset
= 0; /* file overrides offset */
6159 } else if (mddev
->bitmap
== NULL
)
6160 return -ENOENT
; /* cannot remove what isn't there */
6163 mddev
->pers
->quiesce(mddev
, 1);
6165 struct bitmap
*bitmap
;
6167 bitmap
= bitmap_create(mddev
, -1);
6168 if (!IS_ERR(bitmap
)) {
6169 mddev
->bitmap
= bitmap
;
6170 err
= bitmap_load(mddev
);
6172 err
= PTR_ERR(bitmap
);
6174 if (fd
< 0 || err
) {
6175 bitmap_destroy(mddev
);
6176 fd
= -1; /* make sure to put the file */
6178 mddev
->pers
->quiesce(mddev
, 0);
6181 struct file
*f
= mddev
->bitmap_info
.file
;
6183 spin_lock(&mddev
->lock
);
6184 mddev
->bitmap_info
.file
= NULL
;
6185 spin_unlock(&mddev
->lock
);
6194 * set_array_info is used two different ways
6195 * The original usage is when creating a new array.
6196 * In this usage, raid_disks is > 0 and it together with
6197 * level, size, not_persistent,layout,chunksize determine the
6198 * shape of the array.
6199 * This will always create an array with a type-0.90.0 superblock.
6200 * The newer usage is when assembling an array.
6201 * In this case raid_disks will be 0, and the major_version field is
6202 * use to determine which style super-blocks are to be found on the devices.
6203 * The minor and patch _version numbers are also kept incase the
6204 * super_block handler wishes to interpret them.
6206 static int set_array_info(struct mddev
*mddev
, mdu_array_info_t
*info
)
6209 if (info
->raid_disks
== 0) {
6210 /* just setting version number for superblock loading */
6211 if (info
->major_version
< 0 ||
6212 info
->major_version
>= ARRAY_SIZE(super_types
) ||
6213 super_types
[info
->major_version
].name
== NULL
) {
6214 /* maybe try to auto-load a module? */
6216 "md: superblock version %d not known\n",
6217 info
->major_version
);
6220 mddev
->major_version
= info
->major_version
;
6221 mddev
->minor_version
= info
->minor_version
;
6222 mddev
->patch_version
= info
->patch_version
;
6223 mddev
->persistent
= !info
->not_persistent
;
6224 /* ensure mddev_put doesn't delete this now that there
6225 * is some minimal configuration.
6227 mddev
->ctime
= get_seconds();
6230 mddev
->major_version
= MD_MAJOR_VERSION
;
6231 mddev
->minor_version
= MD_MINOR_VERSION
;
6232 mddev
->patch_version
= MD_PATCHLEVEL_VERSION
;
6233 mddev
->ctime
= get_seconds();
6235 mddev
->level
= info
->level
;
6236 mddev
->clevel
[0] = 0;
6237 mddev
->dev_sectors
= 2 * (sector_t
)info
->size
;
6238 mddev
->raid_disks
= info
->raid_disks
;
6239 /* don't set md_minor, it is determined by which /dev/md* was
6242 if (info
->state
& (1<<MD_SB_CLEAN
))
6243 mddev
->recovery_cp
= MaxSector
;
6245 mddev
->recovery_cp
= 0;
6246 mddev
->persistent
= ! info
->not_persistent
;
6247 mddev
->external
= 0;
6249 mddev
->layout
= info
->layout
;
6250 mddev
->chunk_sectors
= info
->chunk_size
>> 9;
6252 mddev
->max_disks
= MD_SB_DISKS
;
6254 if (mddev
->persistent
)
6256 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
6258 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
6259 mddev
->bitmap_info
.default_space
= 64*2 - (MD_SB_BYTES
>> 9);
6260 mddev
->bitmap_info
.offset
= 0;
6262 mddev
->reshape_position
= MaxSector
;
6265 * Generate a 128 bit UUID
6267 get_random_bytes(mddev
->uuid
, 16);
6269 mddev
->new_level
= mddev
->level
;
6270 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
6271 mddev
->new_layout
= mddev
->layout
;
6272 mddev
->delta_disks
= 0;
6273 mddev
->reshape_backwards
= 0;
6278 void md_set_array_sectors(struct mddev
*mddev
, sector_t array_sectors
)
6280 WARN(!mddev_is_locked(mddev
), "%s: unlocked mddev!\n", __func__
);
6282 if (mddev
->external_size
)
6285 mddev
->array_sectors
= array_sectors
;
6287 EXPORT_SYMBOL(md_set_array_sectors
);
6289 static int update_size(struct mddev
*mddev
, sector_t num_sectors
)
6291 struct md_rdev
*rdev
;
6293 int fit
= (num_sectors
== 0);
6295 if (mddev
->pers
->resize
== NULL
)
6297 /* The "num_sectors" is the number of sectors of each device that
6298 * is used. This can only make sense for arrays with redundancy.
6299 * linear and raid0 always use whatever space is available. We can only
6300 * consider changing this number if no resync or reconstruction is
6301 * happening, and if the new size is acceptable. It must fit before the
6302 * sb_start or, if that is <data_offset, it must fit before the size
6303 * of each device. If num_sectors is zero, we find the largest size
6306 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
6312 rdev_for_each(rdev
, mddev
) {
6313 sector_t avail
= rdev
->sectors
;
6315 if (fit
&& (num_sectors
== 0 || num_sectors
> avail
))
6316 num_sectors
= avail
;
6317 if (avail
< num_sectors
)
6320 rv
= mddev
->pers
->resize(mddev
, num_sectors
);
6322 revalidate_disk(mddev
->gendisk
);
6326 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
)
6329 struct md_rdev
*rdev
;
6330 /* change the number of raid disks */
6331 if (mddev
->pers
->check_reshape
== NULL
)
6335 if (raid_disks
<= 0 ||
6336 (mddev
->max_disks
&& raid_disks
>= mddev
->max_disks
))
6338 if (mddev
->sync_thread
||
6339 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
6340 mddev
->reshape_position
!= MaxSector
)
6343 rdev_for_each(rdev
, mddev
) {
6344 if (mddev
->raid_disks
< raid_disks
&&
6345 rdev
->data_offset
< rdev
->new_data_offset
)
6347 if (mddev
->raid_disks
> raid_disks
&&
6348 rdev
->data_offset
> rdev
->new_data_offset
)
6352 mddev
->delta_disks
= raid_disks
- mddev
->raid_disks
;
6353 if (mddev
->delta_disks
< 0)
6354 mddev
->reshape_backwards
= 1;
6355 else if (mddev
->delta_disks
> 0)
6356 mddev
->reshape_backwards
= 0;
6358 rv
= mddev
->pers
->check_reshape(mddev
);
6360 mddev
->delta_disks
= 0;
6361 mddev
->reshape_backwards
= 0;
6367 * update_array_info is used to change the configuration of an
6369 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
6370 * fields in the info are checked against the array.
6371 * Any differences that cannot be handled will cause an error.
6372 * Normally, only one change can be managed at a time.
6374 static int update_array_info(struct mddev
*mddev
, mdu_array_info_t
*info
)
6380 /* calculate expected state,ignoring low bits */
6381 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
6382 state
|= (1 << MD_SB_BITMAP_PRESENT
);
6384 if (mddev
->major_version
!= info
->major_version
||
6385 mddev
->minor_version
!= info
->minor_version
||
6386 /* mddev->patch_version != info->patch_version || */
6387 mddev
->ctime
!= info
->ctime
||
6388 mddev
->level
!= info
->level
||
6389 /* mddev->layout != info->layout || */
6390 mddev
->persistent
!= !info
->not_persistent
||
6391 mddev
->chunk_sectors
!= info
->chunk_size
>> 9 ||
6392 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
6393 ((state
^info
->state
) & 0xfffffe00)
6396 /* Check there is only one change */
6397 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
6399 if (mddev
->raid_disks
!= info
->raid_disks
)
6401 if (mddev
->layout
!= info
->layout
)
6403 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
))
6410 if (mddev
->layout
!= info
->layout
) {
6412 * we don't need to do anything at the md level, the
6413 * personality will take care of it all.
6415 if (mddev
->pers
->check_reshape
== NULL
)
6418 mddev
->new_layout
= info
->layout
;
6419 rv
= mddev
->pers
->check_reshape(mddev
);
6421 mddev
->new_layout
= mddev
->layout
;
6425 if (mddev_is_clustered(mddev
))
6426 md_cluster_ops
->metadata_update_start(mddev
);
6427 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
6428 rv
= update_size(mddev
, (sector_t
)info
->size
* 2);
6430 if (mddev
->raid_disks
!= info
->raid_disks
)
6431 rv
= update_raid_disks(mddev
, info
->raid_disks
);
6433 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) {
6434 if (mddev
->pers
->quiesce
== NULL
|| mddev
->thread
== NULL
) {
6438 if (mddev
->recovery
|| mddev
->sync_thread
) {
6442 if (info
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
6443 struct bitmap
*bitmap
;
6444 /* add the bitmap */
6445 if (mddev
->bitmap
) {
6449 if (mddev
->bitmap_info
.default_offset
== 0) {
6453 mddev
->bitmap_info
.offset
=
6454 mddev
->bitmap_info
.default_offset
;
6455 mddev
->bitmap_info
.space
=
6456 mddev
->bitmap_info
.default_space
;
6457 mddev
->pers
->quiesce(mddev
, 1);
6458 bitmap
= bitmap_create(mddev
, -1);
6459 if (!IS_ERR(bitmap
)) {
6460 mddev
->bitmap
= bitmap
;
6461 rv
= bitmap_load(mddev
);
6463 rv
= PTR_ERR(bitmap
);
6465 bitmap_destroy(mddev
);
6466 mddev
->pers
->quiesce(mddev
, 0);
6468 /* remove the bitmap */
6469 if (!mddev
->bitmap
) {
6473 if (mddev
->bitmap
->storage
.file
) {
6477 mddev
->pers
->quiesce(mddev
, 1);
6478 bitmap_destroy(mddev
);
6479 mddev
->pers
->quiesce(mddev
, 0);
6480 mddev
->bitmap_info
.offset
= 0;
6483 md_update_sb(mddev
, 1);
6484 if (mddev_is_clustered(mddev
))
6485 md_cluster_ops
->metadata_update_finish(mddev
);
6488 if (mddev_is_clustered(mddev
))
6489 md_cluster_ops
->metadata_update_cancel(mddev
);
6493 static int set_disk_faulty(struct mddev
*mddev
, dev_t dev
)
6495 struct md_rdev
*rdev
;
6498 if (mddev
->pers
== NULL
)
6502 rdev
= find_rdev_rcu(mddev
, dev
);
6506 md_error(mddev
, rdev
);
6507 if (!test_bit(Faulty
, &rdev
->flags
))
6515 * We have a problem here : there is no easy way to give a CHS
6516 * virtual geometry. We currently pretend that we have a 2 heads
6517 * 4 sectors (with a BIG number of cylinders...). This drives
6518 * dosfs just mad... ;-)
6520 static int md_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
6522 struct mddev
*mddev
= bdev
->bd_disk
->private_data
;
6526 geo
->cylinders
= mddev
->array_sectors
/ 8;
6530 static inline bool md_ioctl_valid(unsigned int cmd
)
6535 case GET_ARRAY_INFO
:
6536 case GET_BITMAP_FILE
:
6539 case HOT_REMOVE_DISK
:
6542 case RESTART_ARRAY_RW
:
6544 case SET_ARRAY_INFO
:
6545 case SET_BITMAP_FILE
:
6546 case SET_DISK_FAULTY
:
6549 case CLUSTERED_DISK_NACK
:
6556 static int md_ioctl(struct block_device
*bdev
, fmode_t mode
,
6557 unsigned int cmd
, unsigned long arg
)
6560 void __user
*argp
= (void __user
*)arg
;
6561 struct mddev
*mddev
= NULL
;
6564 if (!md_ioctl_valid(cmd
))
6569 case GET_ARRAY_INFO
:
6573 if (!capable(CAP_SYS_ADMIN
))
6578 * Commands dealing with the RAID driver but not any
6583 err
= get_version(argp
);
6589 autostart_arrays(arg
);
6596 * Commands creating/starting a new array:
6599 mddev
= bdev
->bd_disk
->private_data
;
6606 /* Some actions do not requires the mutex */
6608 case GET_ARRAY_INFO
:
6609 if (!mddev
->raid_disks
&& !mddev
->external
)
6612 err
= get_array_info(mddev
, argp
);
6616 if (!mddev
->raid_disks
&& !mddev
->external
)
6619 err
= get_disk_info(mddev
, argp
);
6622 case SET_DISK_FAULTY
:
6623 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
6626 case GET_BITMAP_FILE
:
6627 err
= get_bitmap_file(mddev
, argp
);
6632 if (cmd
== ADD_NEW_DISK
)
6633 /* need to ensure md_delayed_delete() has completed */
6634 flush_workqueue(md_misc_wq
);
6636 if (cmd
== HOT_REMOVE_DISK
)
6637 /* need to ensure recovery thread has run */
6638 wait_event_interruptible_timeout(mddev
->sb_wait
,
6639 !test_bit(MD_RECOVERY_NEEDED
,
6641 msecs_to_jiffies(5000));
6642 if (cmd
== STOP_ARRAY
|| cmd
== STOP_ARRAY_RO
) {
6643 /* Need to flush page cache, and ensure no-one else opens
6646 mutex_lock(&mddev
->open_mutex
);
6647 if (mddev
->pers
&& atomic_read(&mddev
->openers
) > 1) {
6648 mutex_unlock(&mddev
->open_mutex
);
6652 set_bit(MD_STILL_CLOSED
, &mddev
->flags
);
6653 mutex_unlock(&mddev
->open_mutex
);
6654 sync_blockdev(bdev
);
6656 err
= mddev_lock(mddev
);
6659 "md: ioctl lock interrupted, reason %d, cmd %d\n",
6664 if (cmd
== SET_ARRAY_INFO
) {
6665 mdu_array_info_t info
;
6667 memset(&info
, 0, sizeof(info
));
6668 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
6673 err
= update_array_info(mddev
, &info
);
6675 printk(KERN_WARNING
"md: couldn't update"
6676 " array info. %d\n", err
);
6681 if (!list_empty(&mddev
->disks
)) {
6683 "md: array %s already has disks!\n",
6688 if (mddev
->raid_disks
) {
6690 "md: array %s already initialised!\n",
6695 err
= set_array_info(mddev
, &info
);
6697 printk(KERN_WARNING
"md: couldn't set"
6698 " array info. %d\n", err
);
6705 * Commands querying/configuring an existing array:
6707 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
6708 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
6709 if ((!mddev
->raid_disks
&& !mddev
->external
)
6710 && cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
6711 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
6712 && cmd
!= GET_BITMAP_FILE
) {
6718 * Commands even a read-only array can execute:
6721 case RESTART_ARRAY_RW
:
6722 err
= restart_array(mddev
);
6726 err
= do_md_stop(mddev
, 0, bdev
);
6730 err
= md_set_readonly(mddev
, bdev
);
6733 case HOT_REMOVE_DISK
:
6734 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
6738 /* We can support ADD_NEW_DISK on read-only arrays
6739 * on if we are re-adding a preexisting device.
6740 * So require mddev->pers and MD_DISK_SYNC.
6743 mdu_disk_info_t info
;
6744 if (copy_from_user(&info
, argp
, sizeof(info
)))
6746 else if (!(info
.state
& (1<<MD_DISK_SYNC
)))
6747 /* Need to clear read-only for this */
6750 err
= add_new_disk(mddev
, &info
);
6756 if (get_user(ro
, (int __user
*)(arg
))) {
6762 /* if the bdev is going readonly the value of mddev->ro
6763 * does not matter, no writes are coming
6768 /* are we are already prepared for writes? */
6772 /* transitioning to readauto need only happen for
6773 * arrays that call md_write_start
6776 err
= restart_array(mddev
);
6779 set_disk_ro(mddev
->gendisk
, 0);
6786 * The remaining ioctls are changing the state of the
6787 * superblock, so we do not allow them on read-only arrays.
6789 if (mddev
->ro
&& mddev
->pers
) {
6790 if (mddev
->ro
== 2) {
6792 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6793 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6794 /* mddev_unlock will wake thread */
6795 /* If a device failed while we were read-only, we
6796 * need to make sure the metadata is updated now.
6798 if (test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
6799 mddev_unlock(mddev
);
6800 wait_event(mddev
->sb_wait
,
6801 !test_bit(MD_CHANGE_DEVS
, &mddev
->flags
) &&
6802 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
6803 mddev_lock_nointr(mddev
);
6814 mdu_disk_info_t info
;
6815 if (copy_from_user(&info
, argp
, sizeof(info
)))
6818 err
= add_new_disk(mddev
, &info
);
6822 case CLUSTERED_DISK_NACK
:
6823 if (mddev_is_clustered(mddev
))
6824 md_cluster_ops
->new_disk_ack(mddev
, false);
6830 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
6834 err
= do_md_run(mddev
);
6837 case SET_BITMAP_FILE
:
6838 err
= set_bitmap_file(mddev
, (int)arg
);
6847 if (mddev
->hold_active
== UNTIL_IOCTL
&&
6849 mddev
->hold_active
= 0;
6850 mddev_unlock(mddev
);
6854 #ifdef CONFIG_COMPAT
6855 static int md_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
6856 unsigned int cmd
, unsigned long arg
)
6859 case HOT_REMOVE_DISK
:
6861 case SET_DISK_FAULTY
:
6862 case SET_BITMAP_FILE
:
6863 /* These take in integer arg, do not convert */
6866 arg
= (unsigned long)compat_ptr(arg
);
6870 return md_ioctl(bdev
, mode
, cmd
, arg
);
6872 #endif /* CONFIG_COMPAT */
6874 static int md_open(struct block_device
*bdev
, fmode_t mode
)
6877 * Succeed if we can lock the mddev, which confirms that
6878 * it isn't being stopped right now.
6880 struct mddev
*mddev
= mddev_find(bdev
->bd_dev
);
6886 if (mddev
->gendisk
!= bdev
->bd_disk
) {
6887 /* we are racing with mddev_put which is discarding this
6891 /* Wait until bdev->bd_disk is definitely gone */
6892 flush_workqueue(md_misc_wq
);
6893 /* Then retry the open from the top */
6894 return -ERESTARTSYS
;
6896 BUG_ON(mddev
!= bdev
->bd_disk
->private_data
);
6898 if ((err
= mutex_lock_interruptible(&mddev
->open_mutex
)))
6902 atomic_inc(&mddev
->openers
);
6903 clear_bit(MD_STILL_CLOSED
, &mddev
->flags
);
6904 mutex_unlock(&mddev
->open_mutex
);
6906 check_disk_change(bdev
);
6911 static void md_release(struct gendisk
*disk
, fmode_t mode
)
6913 struct mddev
*mddev
= disk
->private_data
;
6916 atomic_dec(&mddev
->openers
);
6920 static int md_media_changed(struct gendisk
*disk
)
6922 struct mddev
*mddev
= disk
->private_data
;
6924 return mddev
->changed
;
6927 static int md_revalidate(struct gendisk
*disk
)
6929 struct mddev
*mddev
= disk
->private_data
;
6934 static const struct block_device_operations md_fops
=
6936 .owner
= THIS_MODULE
,
6938 .release
= md_release
,
6940 #ifdef CONFIG_COMPAT
6941 .compat_ioctl
= md_compat_ioctl
,
6943 .getgeo
= md_getgeo
,
6944 .media_changed
= md_media_changed
,
6945 .revalidate_disk
= md_revalidate
,
6948 static int md_thread(void *arg
)
6950 struct md_thread
*thread
= arg
;
6953 * md_thread is a 'system-thread', it's priority should be very
6954 * high. We avoid resource deadlocks individually in each
6955 * raid personality. (RAID5 does preallocation) We also use RR and
6956 * the very same RT priority as kswapd, thus we will never get
6957 * into a priority inversion deadlock.
6959 * we definitely have to have equal or higher priority than
6960 * bdflush, otherwise bdflush will deadlock if there are too
6961 * many dirty RAID5 blocks.
6964 allow_signal(SIGKILL
);
6965 while (!kthread_should_stop()) {
6967 /* We need to wait INTERRUPTIBLE so that
6968 * we don't add to the load-average.
6969 * That means we need to be sure no signals are
6972 if (signal_pending(current
))
6973 flush_signals(current
);
6975 wait_event_interruptible_timeout
6977 test_bit(THREAD_WAKEUP
, &thread
->flags
)
6978 || kthread_should_stop(),
6981 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
6982 if (!kthread_should_stop())
6983 thread
->run(thread
);
6989 void md_wakeup_thread(struct md_thread
*thread
)
6992 pr_debug("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
6993 set_bit(THREAD_WAKEUP
, &thread
->flags
);
6994 wake_up(&thread
->wqueue
);
6997 EXPORT_SYMBOL(md_wakeup_thread
);
6999 struct md_thread
*md_register_thread(void (*run
) (struct md_thread
*),
7000 struct mddev
*mddev
, const char *name
)
7002 struct md_thread
*thread
;
7004 thread
= kzalloc(sizeof(struct md_thread
), GFP_KERNEL
);
7008 init_waitqueue_head(&thread
->wqueue
);
7011 thread
->mddev
= mddev
;
7012 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
7013 thread
->tsk
= kthread_run(md_thread
, thread
,
7015 mdname(thread
->mddev
),
7017 if (IS_ERR(thread
->tsk
)) {
7023 EXPORT_SYMBOL(md_register_thread
);
7025 void md_unregister_thread(struct md_thread
**threadp
)
7027 struct md_thread
*thread
= *threadp
;
7030 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread
->tsk
));
7031 /* Locking ensures that mddev_unlock does not wake_up a
7032 * non-existent thread
7034 spin_lock(&pers_lock
);
7036 spin_unlock(&pers_lock
);
7038 kthread_stop(thread
->tsk
);
7041 EXPORT_SYMBOL(md_unregister_thread
);
7043 void md_error(struct mddev
*mddev
, struct md_rdev
*rdev
)
7045 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
7048 if (!mddev
->pers
|| !mddev
->pers
->error_handler
)
7050 mddev
->pers
->error_handler(mddev
,rdev
);
7051 if (mddev
->degraded
)
7052 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7053 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
7054 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7055 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7056 md_wakeup_thread(mddev
->thread
);
7057 if (mddev
->event_work
.func
)
7058 queue_work(md_misc_wq
, &mddev
->event_work
);
7059 md_new_event_inintr(mddev
);
7061 EXPORT_SYMBOL(md_error
);
7063 /* seq_file implementation /proc/mdstat */
7065 static void status_unused(struct seq_file
*seq
)
7068 struct md_rdev
*rdev
;
7070 seq_printf(seq
, "unused devices: ");
7072 list_for_each_entry(rdev
, &pending_raid_disks
, same_set
) {
7073 char b
[BDEVNAME_SIZE
];
7075 seq_printf(seq
, "%s ",
7076 bdevname(rdev
->bdev
,b
));
7079 seq_printf(seq
, "<none>");
7081 seq_printf(seq
, "\n");
7084 static int status_resync(struct seq_file
*seq
, struct mddev
*mddev
)
7086 sector_t max_sectors
, resync
, res
;
7087 unsigned long dt
, db
;
7090 unsigned int per_milli
;
7092 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
7093 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
7094 max_sectors
= mddev
->resync_max_sectors
;
7096 max_sectors
= mddev
->dev_sectors
;
7098 resync
= mddev
->curr_resync
;
7100 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
7101 /* Still cleaning up */
7102 resync
= max_sectors
;
7104 resync
-= atomic_read(&mddev
->recovery_active
);
7107 if (mddev
->recovery_cp
< MaxSector
) {
7108 seq_printf(seq
, "\tresync=PENDING");
7114 seq_printf(seq
, "\tresync=DELAYED");
7118 WARN_ON(max_sectors
== 0);
7119 /* Pick 'scale' such that (resync>>scale)*1000 will fit
7120 * in a sector_t, and (max_sectors>>scale) will fit in a
7121 * u32, as those are the requirements for sector_div.
7122 * Thus 'scale' must be at least 10
7125 if (sizeof(sector_t
) > sizeof(unsigned long)) {
7126 while ( max_sectors
/2 > (1ULL<<(scale
+32)))
7129 res
= (resync
>>scale
)*1000;
7130 sector_div(res
, (u32
)((max_sectors
>>scale
)+1));
7134 int i
, x
= per_milli
/50, y
= 20-x
;
7135 seq_printf(seq
, "[");
7136 for (i
= 0; i
< x
; i
++)
7137 seq_printf(seq
, "=");
7138 seq_printf(seq
, ">");
7139 for (i
= 0; i
< y
; i
++)
7140 seq_printf(seq
, ".");
7141 seq_printf(seq
, "] ");
7143 seq_printf(seq
, " %s =%3u.%u%% (%llu/%llu)",
7144 (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)?
7146 (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)?
7148 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
7149 "resync" : "recovery"))),
7150 per_milli
/10, per_milli
% 10,
7151 (unsigned long long) resync
/2,
7152 (unsigned long long) max_sectors
/2);
7155 * dt: time from mark until now
7156 * db: blocks written from mark until now
7157 * rt: remaining time
7159 * rt is a sector_t, so could be 32bit or 64bit.
7160 * So we divide before multiply in case it is 32bit and close
7162 * We scale the divisor (db) by 32 to avoid losing precision
7163 * near the end of resync when the number of remaining sectors
7165 * We then divide rt by 32 after multiplying by db to compensate.
7166 * The '+1' avoids division by zero if db is very small.
7168 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
7170 db
= (mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
))
7171 - mddev
->resync_mark_cnt
;
7173 rt
= max_sectors
- resync
; /* number of remaining sectors */
7174 sector_div(rt
, db
/32+1);
7178 seq_printf(seq
, " finish=%lu.%lumin", (unsigned long)rt
/ 60,
7179 ((unsigned long)rt
% 60)/6);
7181 seq_printf(seq
, " speed=%ldK/sec", db
/2/dt
);
7185 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
7187 struct list_head
*tmp
;
7189 struct mddev
*mddev
;
7197 spin_lock(&all_mddevs_lock
);
7198 list_for_each(tmp
,&all_mddevs
)
7200 mddev
= list_entry(tmp
, struct mddev
, all_mddevs
);
7202 spin_unlock(&all_mddevs_lock
);
7205 spin_unlock(&all_mddevs_lock
);
7207 return (void*)2;/* tail */
7211 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
7213 struct list_head
*tmp
;
7214 struct mddev
*next_mddev
, *mddev
= v
;
7220 spin_lock(&all_mddevs_lock
);
7222 tmp
= all_mddevs
.next
;
7224 tmp
= mddev
->all_mddevs
.next
;
7225 if (tmp
!= &all_mddevs
)
7226 next_mddev
= mddev_get(list_entry(tmp
,struct mddev
,all_mddevs
));
7228 next_mddev
= (void*)2;
7231 spin_unlock(&all_mddevs_lock
);
7239 static void md_seq_stop(struct seq_file
*seq
, void *v
)
7241 struct mddev
*mddev
= v
;
7243 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
7247 static int md_seq_show(struct seq_file
*seq
, void *v
)
7249 struct mddev
*mddev
= v
;
7251 struct md_rdev
*rdev
;
7253 if (v
== (void*)1) {
7254 struct md_personality
*pers
;
7255 seq_printf(seq
, "Personalities : ");
7256 spin_lock(&pers_lock
);
7257 list_for_each_entry(pers
, &pers_list
, list
)
7258 seq_printf(seq
, "[%s] ", pers
->name
);
7260 spin_unlock(&pers_lock
);
7261 seq_printf(seq
, "\n");
7262 seq
->poll_event
= atomic_read(&md_event_count
);
7265 if (v
== (void*)2) {
7270 spin_lock(&mddev
->lock
);
7271 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
7272 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
7273 mddev
->pers
? "" : "in");
7276 seq_printf(seq
, " (read-only)");
7278 seq_printf(seq
, " (auto-read-only)");
7279 seq_printf(seq
, " %s", mddev
->pers
->name
);
7284 rdev_for_each_rcu(rdev
, mddev
) {
7285 char b
[BDEVNAME_SIZE
];
7286 seq_printf(seq
, " %s[%d]",
7287 bdevname(rdev
->bdev
,b
), rdev
->desc_nr
);
7288 if (test_bit(WriteMostly
, &rdev
->flags
))
7289 seq_printf(seq
, "(W)");
7290 if (test_bit(Faulty
, &rdev
->flags
)) {
7291 seq_printf(seq
, "(F)");
7294 if (rdev
->raid_disk
< 0)
7295 seq_printf(seq
, "(S)"); /* spare */
7296 if (test_bit(Replacement
, &rdev
->flags
))
7297 seq_printf(seq
, "(R)");
7298 sectors
+= rdev
->sectors
;
7302 if (!list_empty(&mddev
->disks
)) {
7304 seq_printf(seq
, "\n %llu blocks",
7305 (unsigned long long)
7306 mddev
->array_sectors
/ 2);
7308 seq_printf(seq
, "\n %llu blocks",
7309 (unsigned long long)sectors
/ 2);
7311 if (mddev
->persistent
) {
7312 if (mddev
->major_version
!= 0 ||
7313 mddev
->minor_version
!= 90) {
7314 seq_printf(seq
," super %d.%d",
7315 mddev
->major_version
,
7316 mddev
->minor_version
);
7318 } else if (mddev
->external
)
7319 seq_printf(seq
, " super external:%s",
7320 mddev
->metadata_type
);
7322 seq_printf(seq
, " super non-persistent");
7325 mddev
->pers
->status(seq
, mddev
);
7326 seq_printf(seq
, "\n ");
7327 if (mddev
->pers
->sync_request
) {
7328 if (status_resync(seq
, mddev
))
7329 seq_printf(seq
, "\n ");
7332 seq_printf(seq
, "\n ");
7334 bitmap_status(seq
, mddev
->bitmap
);
7336 seq_printf(seq
, "\n");
7338 spin_unlock(&mddev
->lock
);
7343 static const struct seq_operations md_seq_ops
= {
7344 .start
= md_seq_start
,
7345 .next
= md_seq_next
,
7346 .stop
= md_seq_stop
,
7347 .show
= md_seq_show
,
7350 static int md_seq_open(struct inode
*inode
, struct file
*file
)
7352 struct seq_file
*seq
;
7355 error
= seq_open(file
, &md_seq_ops
);
7359 seq
= file
->private_data
;
7360 seq
->poll_event
= atomic_read(&md_event_count
);
7364 static int md_unloading
;
7365 static unsigned int mdstat_poll(struct file
*filp
, poll_table
*wait
)
7367 struct seq_file
*seq
= filp
->private_data
;
7371 return POLLIN
|POLLRDNORM
|POLLERR
|POLLPRI
;
7372 poll_wait(filp
, &md_event_waiters
, wait
);
7374 /* always allow read */
7375 mask
= POLLIN
| POLLRDNORM
;
7377 if (seq
->poll_event
!= atomic_read(&md_event_count
))
7378 mask
|= POLLERR
| POLLPRI
;
7382 static const struct file_operations md_seq_fops
= {
7383 .owner
= THIS_MODULE
,
7384 .open
= md_seq_open
,
7386 .llseek
= seq_lseek
,
7387 .release
= seq_release_private
,
7388 .poll
= mdstat_poll
,
7391 int register_md_personality(struct md_personality
*p
)
7393 printk(KERN_INFO
"md: %s personality registered for level %d\n",
7395 spin_lock(&pers_lock
);
7396 list_add_tail(&p
->list
, &pers_list
);
7397 spin_unlock(&pers_lock
);
7400 EXPORT_SYMBOL(register_md_personality
);
7402 int unregister_md_personality(struct md_personality
*p
)
7404 printk(KERN_INFO
"md: %s personality unregistered\n", p
->name
);
7405 spin_lock(&pers_lock
);
7406 list_del_init(&p
->list
);
7407 spin_unlock(&pers_lock
);
7410 EXPORT_SYMBOL(unregister_md_personality
);
7412 int register_md_cluster_operations(struct md_cluster_operations
*ops
,
7413 struct module
*module
)
7416 spin_lock(&pers_lock
);
7417 if (md_cluster_ops
!= NULL
)
7420 md_cluster_ops
= ops
;
7421 md_cluster_mod
= module
;
7423 spin_unlock(&pers_lock
);
7426 EXPORT_SYMBOL(register_md_cluster_operations
);
7428 int unregister_md_cluster_operations(void)
7430 spin_lock(&pers_lock
);
7431 md_cluster_ops
= NULL
;
7432 spin_unlock(&pers_lock
);
7435 EXPORT_SYMBOL(unregister_md_cluster_operations
);
7437 int md_setup_cluster(struct mddev
*mddev
, int nodes
)
7441 err
= request_module("md-cluster");
7443 pr_err("md-cluster module not found.\n");
7447 spin_lock(&pers_lock
);
7448 if (!md_cluster_ops
|| !try_module_get(md_cluster_mod
)) {
7449 spin_unlock(&pers_lock
);
7452 spin_unlock(&pers_lock
);
7454 return md_cluster_ops
->join(mddev
, nodes
);
7457 void md_cluster_stop(struct mddev
*mddev
)
7459 if (!md_cluster_ops
)
7461 md_cluster_ops
->leave(mddev
);
7462 module_put(md_cluster_mod
);
7465 static int is_mddev_idle(struct mddev
*mddev
, int init
)
7467 struct md_rdev
*rdev
;
7473 rdev_for_each_rcu(rdev
, mddev
) {
7474 struct gendisk
*disk
= rdev
->bdev
->bd_contains
->bd_disk
;
7475 curr_events
= (int)part_stat_read(&disk
->part0
, sectors
[0]) +
7476 (int)part_stat_read(&disk
->part0
, sectors
[1]) -
7477 atomic_read(&disk
->sync_io
);
7478 /* sync IO will cause sync_io to increase before the disk_stats
7479 * as sync_io is counted when a request starts, and
7480 * disk_stats is counted when it completes.
7481 * So resync activity will cause curr_events to be smaller than
7482 * when there was no such activity.
7483 * non-sync IO will cause disk_stat to increase without
7484 * increasing sync_io so curr_events will (eventually)
7485 * be larger than it was before. Once it becomes
7486 * substantially larger, the test below will cause
7487 * the array to appear non-idle, and resync will slow
7489 * If there is a lot of outstanding resync activity when
7490 * we set last_event to curr_events, then all that activity
7491 * completing might cause the array to appear non-idle
7492 * and resync will be slowed down even though there might
7493 * not have been non-resync activity. This will only
7494 * happen once though. 'last_events' will soon reflect
7495 * the state where there is little or no outstanding
7496 * resync requests, and further resync activity will
7497 * always make curr_events less than last_events.
7500 if (init
|| curr_events
- rdev
->last_events
> 64) {
7501 rdev
->last_events
= curr_events
;
7509 void md_done_sync(struct mddev
*mddev
, int blocks
, int ok
)
7511 /* another "blocks" (512byte) blocks have been synced */
7512 atomic_sub(blocks
, &mddev
->recovery_active
);
7513 wake_up(&mddev
->recovery_wait
);
7515 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7516 set_bit(MD_RECOVERY_ERROR
, &mddev
->recovery
);
7517 md_wakeup_thread(mddev
->thread
);
7518 // stop recovery, signal do_sync ....
7521 EXPORT_SYMBOL(md_done_sync
);
7523 /* md_write_start(mddev, bi)
7524 * If we need to update some array metadata (e.g. 'active' flag
7525 * in superblock) before writing, schedule a superblock update
7526 * and wait for it to complete.
7528 void md_write_start(struct mddev
*mddev
, struct bio
*bi
)
7531 if (bio_data_dir(bi
) != WRITE
)
7534 BUG_ON(mddev
->ro
== 1);
7535 if (mddev
->ro
== 2) {
7536 /* need to switch to read/write */
7538 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7539 md_wakeup_thread(mddev
->thread
);
7540 md_wakeup_thread(mddev
->sync_thread
);
7543 atomic_inc(&mddev
->writes_pending
);
7544 if (mddev
->safemode
== 1)
7545 mddev
->safemode
= 0;
7546 if (mddev
->in_sync
) {
7547 spin_lock(&mddev
->lock
);
7548 if (mddev
->in_sync
) {
7550 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7551 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
7552 md_wakeup_thread(mddev
->thread
);
7555 spin_unlock(&mddev
->lock
);
7558 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7559 wait_event(mddev
->sb_wait
,
7560 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
7562 EXPORT_SYMBOL(md_write_start
);
7564 void md_write_end(struct mddev
*mddev
)
7566 if (atomic_dec_and_test(&mddev
->writes_pending
)) {
7567 if (mddev
->safemode
== 2)
7568 md_wakeup_thread(mddev
->thread
);
7569 else if (mddev
->safemode_delay
)
7570 mod_timer(&mddev
->safemode_timer
, jiffies
+ mddev
->safemode_delay
);
7573 EXPORT_SYMBOL(md_write_end
);
7575 /* md_allow_write(mddev)
7576 * Calling this ensures that the array is marked 'active' so that writes
7577 * may proceed without blocking. It is important to call this before
7578 * attempting a GFP_KERNEL allocation while holding the mddev lock.
7579 * Must be called with mddev_lock held.
7581 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
7582 * is dropped, so return -EAGAIN after notifying userspace.
7584 int md_allow_write(struct mddev
*mddev
)
7590 if (!mddev
->pers
->sync_request
)
7593 spin_lock(&mddev
->lock
);
7594 if (mddev
->in_sync
) {
7596 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7597 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
7598 if (mddev
->safemode_delay
&&
7599 mddev
->safemode
== 0)
7600 mddev
->safemode
= 1;
7601 spin_unlock(&mddev
->lock
);
7602 if (mddev_is_clustered(mddev
))
7603 md_cluster_ops
->metadata_update_start(mddev
);
7604 md_update_sb(mddev
, 0);
7605 if (mddev_is_clustered(mddev
))
7606 md_cluster_ops
->metadata_update_finish(mddev
);
7607 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7609 spin_unlock(&mddev
->lock
);
7611 if (test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
7616 EXPORT_SYMBOL_GPL(md_allow_write
);
7618 #define SYNC_MARKS 10
7619 #define SYNC_MARK_STEP (3*HZ)
7620 #define UPDATE_FREQUENCY (5*60*HZ)
7621 void md_do_sync(struct md_thread
*thread
)
7623 struct mddev
*mddev
= thread
->mddev
;
7624 struct mddev
*mddev2
;
7625 unsigned int currspeed
= 0,
7627 sector_t max_sectors
,j
, io_sectors
, recovery_done
;
7628 unsigned long mark
[SYNC_MARKS
];
7629 unsigned long update_time
;
7630 sector_t mark_cnt
[SYNC_MARKS
];
7632 struct list_head
*tmp
;
7633 sector_t last_check
;
7635 struct md_rdev
*rdev
;
7636 char *desc
, *action
= NULL
;
7637 struct blk_plug plug
;
7639 /* just incase thread restarts... */
7640 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
7642 if (mddev
->ro
) {/* never try to sync a read-only array */
7643 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7647 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7648 if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)) {
7649 desc
= "data-check";
7651 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
7652 desc
= "requested-resync";
7656 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
7661 mddev
->last_sync_action
= action
?: desc
;
7663 /* we overload curr_resync somewhat here.
7664 * 0 == not engaged in resync at all
7665 * 2 == checking that there is no conflict with another sync
7666 * 1 == like 2, but have yielded to allow conflicting resync to
7668 * other == active in resync - this many blocks
7670 * Before starting a resync we must have set curr_resync to
7671 * 2, and then checked that every "conflicting" array has curr_resync
7672 * less than ours. When we find one that is the same or higher
7673 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
7674 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
7675 * This will mean we have to start checking from the beginning again.
7680 mddev
->curr_resync
= 2;
7683 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7685 for_each_mddev(mddev2
, tmp
) {
7686 if (mddev2
== mddev
)
7688 if (!mddev
->parallel_resync
7689 && mddev2
->curr_resync
7690 && match_mddev_units(mddev
, mddev2
)) {
7692 if (mddev
< mddev2
&& mddev
->curr_resync
== 2) {
7693 /* arbitrarily yield */
7694 mddev
->curr_resync
= 1;
7695 wake_up(&resync_wait
);
7697 if (mddev
> mddev2
&& mddev
->curr_resync
== 1)
7698 /* no need to wait here, we can wait the next
7699 * time 'round when curr_resync == 2
7702 /* We need to wait 'interruptible' so as not to
7703 * contribute to the load average, and not to
7704 * be caught by 'softlockup'
7706 prepare_to_wait(&resync_wait
, &wq
, TASK_INTERRUPTIBLE
);
7707 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
7708 mddev2
->curr_resync
>= mddev
->curr_resync
) {
7709 printk(KERN_INFO
"md: delaying %s of %s"
7710 " until %s has finished (they"
7711 " share one or more physical units)\n",
7712 desc
, mdname(mddev
), mdname(mddev2
));
7714 if (signal_pending(current
))
7715 flush_signals(current
);
7717 finish_wait(&resync_wait
, &wq
);
7720 finish_wait(&resync_wait
, &wq
);
7723 } while (mddev
->curr_resync
< 2);
7726 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7727 /* resync follows the size requested by the personality,
7728 * which defaults to physical size, but can be virtual size
7730 max_sectors
= mddev
->resync_max_sectors
;
7731 atomic64_set(&mddev
->resync_mismatches
, 0);
7732 /* we don't use the checkpoint if there's a bitmap */
7733 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7734 j
= mddev
->resync_min
;
7735 else if (!mddev
->bitmap
)
7736 j
= mddev
->recovery_cp
;
7738 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
7739 max_sectors
= mddev
->resync_max_sectors
;
7741 /* recovery follows the physical size of devices */
7742 max_sectors
= mddev
->dev_sectors
;
7745 rdev_for_each_rcu(rdev
, mddev
)
7746 if (rdev
->raid_disk
>= 0 &&
7747 !test_bit(Faulty
, &rdev
->flags
) &&
7748 !test_bit(In_sync
, &rdev
->flags
) &&
7749 rdev
->recovery_offset
< j
)
7750 j
= rdev
->recovery_offset
;
7753 /* If there is a bitmap, we need to make sure all
7754 * writes that started before we added a spare
7755 * complete before we start doing a recovery.
7756 * Otherwise the write might complete and (via
7757 * bitmap_endwrite) set a bit in the bitmap after the
7758 * recovery has checked that bit and skipped that
7761 if (mddev
->bitmap
) {
7762 mddev
->pers
->quiesce(mddev
, 1);
7763 mddev
->pers
->quiesce(mddev
, 0);
7767 printk(KERN_INFO
"md: %s of RAID array %s\n", desc
, mdname(mddev
));
7768 printk(KERN_INFO
"md: minimum _guaranteed_ speed:"
7769 " %d KB/sec/disk.\n", speed_min(mddev
));
7770 printk(KERN_INFO
"md: using maximum available idle IO bandwidth "
7771 "(but not more than %d KB/sec) for %s.\n",
7772 speed_max(mddev
), desc
);
7774 is_mddev_idle(mddev
, 1); /* this initializes IO event counters */
7777 for (m
= 0; m
< SYNC_MARKS
; m
++) {
7779 mark_cnt
[m
] = io_sectors
;
7782 mddev
->resync_mark
= mark
[last_mark
];
7783 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
7786 * Tune reconstruction:
7788 window
= 32*(PAGE_SIZE
/512);
7789 printk(KERN_INFO
"md: using %dk window, over a total of %lluk.\n",
7790 window
/2, (unsigned long long)max_sectors
/2);
7792 atomic_set(&mddev
->recovery_active
, 0);
7797 "md: resuming %s of %s from checkpoint.\n",
7798 desc
, mdname(mddev
));
7799 mddev
->curr_resync
= j
;
7801 mddev
->curr_resync
= 3; /* no longer delayed */
7802 mddev
->curr_resync_completed
= j
;
7803 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
7804 md_new_event(mddev
);
7805 update_time
= jiffies
;
7807 blk_start_plug(&plug
);
7808 while (j
< max_sectors
) {
7813 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
7814 ((mddev
->curr_resync
> mddev
->curr_resync_completed
&&
7815 (mddev
->curr_resync
- mddev
->curr_resync_completed
)
7816 > (max_sectors
>> 4)) ||
7817 time_after_eq(jiffies
, update_time
+ UPDATE_FREQUENCY
) ||
7818 (j
- mddev
->curr_resync_completed
)*2
7819 >= mddev
->resync_max
- mddev
->curr_resync_completed
||
7820 mddev
->curr_resync_completed
> mddev
->resync_max
7822 /* time to update curr_resync_completed */
7823 wait_event(mddev
->recovery_wait
,
7824 atomic_read(&mddev
->recovery_active
) == 0);
7825 mddev
->curr_resync_completed
= j
;
7826 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) &&
7827 j
> mddev
->recovery_cp
)
7828 mddev
->recovery_cp
= j
;
7829 update_time
= jiffies
;
7830 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7831 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
7834 while (j
>= mddev
->resync_max
&&
7835 !test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
7836 /* As this condition is controlled by user-space,
7837 * we can block indefinitely, so use '_interruptible'
7838 * to avoid triggering warnings.
7840 flush_signals(current
); /* just in case */
7841 wait_event_interruptible(mddev
->recovery_wait
,
7842 mddev
->resync_max
> j
7843 || test_bit(MD_RECOVERY_INTR
,
7847 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7850 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
);
7852 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7856 if (!skipped
) { /* actual IO requested */
7857 io_sectors
+= sectors
;
7858 atomic_add(sectors
, &mddev
->recovery_active
);
7861 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7865 if (j
> max_sectors
)
7866 /* when skipping, extra large numbers can be returned. */
7869 mddev
->curr_resync
= j
;
7870 mddev
->curr_mark_cnt
= io_sectors
;
7871 if (last_check
== 0)
7872 /* this is the earliest that rebuild will be
7873 * visible in /proc/mdstat
7875 md_new_event(mddev
);
7877 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
7880 last_check
= io_sectors
;
7882 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
7884 int next
= (last_mark
+1) % SYNC_MARKS
;
7886 mddev
->resync_mark
= mark
[next
];
7887 mddev
->resync_mark_cnt
= mark_cnt
[next
];
7888 mark
[next
] = jiffies
;
7889 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
7893 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7897 * this loop exits only if either when we are slower than
7898 * the 'hard' speed limit, or the system was IO-idle for
7900 * the system might be non-idle CPU-wise, but we only care
7901 * about not overloading the IO subsystem. (things like an
7902 * e2fsck being done on the RAID array should execute fast)
7906 recovery_done
= io_sectors
- atomic_read(&mddev
->recovery_active
);
7907 currspeed
= ((unsigned long)(recovery_done
- mddev
->resync_mark_cnt
))/2
7908 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
7910 if (currspeed
> speed_min(mddev
)) {
7911 if (currspeed
> speed_max(mddev
)) {
7915 if (!is_mddev_idle(mddev
, 0)) {
7917 * Give other IO more of a chance.
7918 * The faster the devices, the less we wait.
7920 wait_event(mddev
->recovery_wait
,
7921 !atomic_read(&mddev
->recovery_active
));
7925 printk(KERN_INFO
"md: %s: %s %s.\n",mdname(mddev
), desc
,
7926 test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)
7927 ? "interrupted" : "done");
7929 * this also signals 'finished resyncing' to md_stop
7931 blk_finish_plug(&plug
);
7932 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
7934 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
7935 !test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
7936 mddev
->curr_resync
> 2) {
7937 mddev
->curr_resync_completed
= mddev
->curr_resync
;
7938 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
7940 /* tell personality that we are finished */
7941 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
);
7943 if (!test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
) &&
7944 mddev
->curr_resync
> 2) {
7945 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7946 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
7947 if (mddev
->curr_resync
>= mddev
->recovery_cp
) {
7949 "md: checkpointing %s of %s.\n",
7950 desc
, mdname(mddev
));
7951 if (test_bit(MD_RECOVERY_ERROR
,
7953 mddev
->recovery_cp
=
7954 mddev
->curr_resync_completed
;
7956 mddev
->recovery_cp
=
7960 mddev
->recovery_cp
= MaxSector
;
7962 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7963 mddev
->curr_resync
= MaxSector
;
7965 rdev_for_each_rcu(rdev
, mddev
)
7966 if (rdev
->raid_disk
>= 0 &&
7967 mddev
->delta_disks
>= 0 &&
7968 !test_bit(Faulty
, &rdev
->flags
) &&
7969 !test_bit(In_sync
, &rdev
->flags
) &&
7970 rdev
->recovery_offset
< mddev
->curr_resync
)
7971 rdev
->recovery_offset
= mddev
->curr_resync
;
7976 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7978 spin_lock(&mddev
->lock
);
7979 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
7980 /* We completed so min/max setting can be forgotten if used. */
7981 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7982 mddev
->resync_min
= 0;
7983 mddev
->resync_max
= MaxSector
;
7984 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7985 mddev
->resync_min
= mddev
->curr_resync_completed
;
7986 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
7987 mddev
->curr_resync
= 0;
7988 spin_unlock(&mddev
->lock
);
7990 wake_up(&resync_wait
);
7991 md_wakeup_thread(mddev
->thread
);
7994 EXPORT_SYMBOL_GPL(md_do_sync
);
7996 static int remove_and_add_spares(struct mddev
*mddev
,
7997 struct md_rdev
*this)
7999 struct md_rdev
*rdev
;
8003 rdev_for_each(rdev
, mddev
)
8004 if ((this == NULL
|| rdev
== this) &&
8005 rdev
->raid_disk
>= 0 &&
8006 !test_bit(Blocked
, &rdev
->flags
) &&
8007 (test_bit(Faulty
, &rdev
->flags
) ||
8008 ! test_bit(In_sync
, &rdev
->flags
)) &&
8009 atomic_read(&rdev
->nr_pending
)==0) {
8010 if (mddev
->pers
->hot_remove_disk(
8011 mddev
, rdev
) == 0) {
8012 sysfs_unlink_rdev(mddev
, rdev
);
8013 rdev
->raid_disk
= -1;
8017 if (removed
&& mddev
->kobj
.sd
)
8018 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
8020 if (this && removed
)
8023 rdev_for_each(rdev
, mddev
) {
8024 if (this && this != rdev
)
8026 if (rdev
->raid_disk
>= 0 &&
8027 !test_bit(In_sync
, &rdev
->flags
) &&
8028 !test_bit(Faulty
, &rdev
->flags
))
8030 if (rdev
->raid_disk
>= 0)
8032 if (test_bit(Faulty
, &rdev
->flags
))
8035 ! (rdev
->saved_raid_disk
>= 0 &&
8036 !test_bit(Bitmap_sync
, &rdev
->flags
)))
8039 if (rdev
->saved_raid_disk
< 0)
8040 rdev
->recovery_offset
= 0;
8042 hot_add_disk(mddev
, rdev
) == 0) {
8043 if (sysfs_link_rdev(mddev
, rdev
))
8044 /* failure here is OK */;
8046 md_new_event(mddev
);
8047 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
8052 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
8056 static void md_start_sync(struct work_struct
*ws
)
8058 struct mddev
*mddev
= container_of(ws
, struct mddev
, del_work
);
8060 mddev
->sync_thread
= md_register_thread(md_do_sync
,
8063 if (!mddev
->sync_thread
) {
8064 printk(KERN_ERR
"%s: could not start resync"
8067 /* leave the spares where they are, it shouldn't hurt */
8068 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8069 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
8070 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
8071 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
8072 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8073 wake_up(&resync_wait
);
8074 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
8076 if (mddev
->sysfs_action
)
8077 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
8079 md_wakeup_thread(mddev
->sync_thread
);
8080 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
8081 md_new_event(mddev
);
8085 * This routine is regularly called by all per-raid-array threads to
8086 * deal with generic issues like resync and super-block update.
8087 * Raid personalities that don't have a thread (linear/raid0) do not
8088 * need this as they never do any recovery or update the superblock.
8090 * It does not do any resync itself, but rather "forks" off other threads
8091 * to do that as needed.
8092 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
8093 * "->recovery" and create a thread at ->sync_thread.
8094 * When the thread finishes it sets MD_RECOVERY_DONE
8095 * and wakeups up this thread which will reap the thread and finish up.
8096 * This thread also removes any faulty devices (with nr_pending == 0).
8098 * The overall approach is:
8099 * 1/ if the superblock needs updating, update it.
8100 * 2/ If a recovery thread is running, don't do anything else.
8101 * 3/ If recovery has finished, clean up, possibly marking spares active.
8102 * 4/ If there are any faulty devices, remove them.
8103 * 5/ If array is degraded, try to add spares devices
8104 * 6/ If array has spares or is not in-sync, start a resync thread.
8106 void md_check_recovery(struct mddev
*mddev
)
8108 if (mddev
->suspended
)
8112 bitmap_daemon_work(mddev
);
8114 if (signal_pending(current
)) {
8115 if (mddev
->pers
->sync_request
&& !mddev
->external
) {
8116 printk(KERN_INFO
"md: %s in immediate safe mode\n",
8118 mddev
->safemode
= 2;
8120 flush_signals(current
);
8123 if (mddev
->ro
&& !test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
8126 (mddev
->flags
& MD_UPDATE_SB_FLAGS
& ~ (1<<MD_CHANGE_PENDING
)) ||
8127 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
8128 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
8129 (mddev
->external
== 0 && mddev
->safemode
== 1) ||
8130 (mddev
->safemode
== 2 && ! atomic_read(&mddev
->writes_pending
)
8131 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
8135 if (mddev_trylock(mddev
)) {
8139 struct md_rdev
*rdev
;
8140 if (!mddev
->external
&& mddev
->in_sync
)
8141 /* 'Blocked' flag not needed as failed devices
8142 * will be recorded if array switched to read/write.
8143 * Leaving it set will prevent the device
8144 * from being removed.
8146 rdev_for_each(rdev
, mddev
)
8147 clear_bit(Blocked
, &rdev
->flags
);
8148 /* On a read-only array we can:
8149 * - remove failed devices
8150 * - add already-in_sync devices if the array itself
8152 * As we only add devices that are already in-sync,
8153 * we can activate the spares immediately.
8155 remove_and_add_spares(mddev
, NULL
);
8156 /* There is no thread, but we need to call
8157 * ->spare_active and clear saved_raid_disk
8159 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8160 md_reap_sync_thread(mddev
);
8161 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8162 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
8163 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
8167 if (!mddev
->external
) {
8169 spin_lock(&mddev
->lock
);
8170 if (mddev
->safemode
&&
8171 !atomic_read(&mddev
->writes_pending
) &&
8173 mddev
->recovery_cp
== MaxSector
) {
8176 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
8178 if (mddev
->safemode
== 1)
8179 mddev
->safemode
= 0;
8180 spin_unlock(&mddev
->lock
);
8182 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
8185 if (mddev
->flags
& MD_UPDATE_SB_FLAGS
) {
8186 if (mddev_is_clustered(mddev
))
8187 md_cluster_ops
->metadata_update_start(mddev
);
8188 md_update_sb(mddev
, 0);
8189 if (mddev_is_clustered(mddev
))
8190 md_cluster_ops
->metadata_update_finish(mddev
);
8193 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
8194 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
8195 /* resync/recovery still happening */
8196 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
8199 if (mddev
->sync_thread
) {
8200 md_reap_sync_thread(mddev
);
8203 /* Set RUNNING before clearing NEEDED to avoid
8204 * any transients in the value of "sync_action".
8206 mddev
->curr_resync_completed
= 0;
8207 spin_lock(&mddev
->lock
);
8208 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8209 spin_unlock(&mddev
->lock
);
8210 /* Clear some bits that don't mean anything, but
8213 clear_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8214 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
8216 if (!test_and_clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
8217 test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
8219 /* no recovery is running.
8220 * remove any failed drives, then
8221 * add spares if possible.
8222 * Spares are also removed and re-added, to allow
8223 * the personality to fail the re-add.
8226 if (mddev
->reshape_position
!= MaxSector
) {
8227 if (mddev
->pers
->check_reshape
== NULL
||
8228 mddev
->pers
->check_reshape(mddev
) != 0)
8229 /* Cannot proceed */
8231 set_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
8232 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8233 } else if ((spares
= remove_and_add_spares(mddev
, NULL
))) {
8234 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8235 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
8236 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
8237 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8238 } else if (mddev
->recovery_cp
< MaxSector
) {
8239 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8240 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8241 } else if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
8242 /* nothing to be done ... */
8245 if (mddev
->pers
->sync_request
) {
8247 /* We are adding a device or devices to an array
8248 * which has the bitmap stored on all devices.
8249 * So make sure all bitmap pages get written
8251 bitmap_write_all(mddev
->bitmap
);
8253 INIT_WORK(&mddev
->del_work
, md_start_sync
);
8254 queue_work(md_misc_wq
, &mddev
->del_work
);
8258 if (!mddev
->sync_thread
) {
8259 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8260 wake_up(&resync_wait
);
8261 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
8263 if (mddev
->sysfs_action
)
8264 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
8267 wake_up(&mddev
->sb_wait
);
8268 mddev_unlock(mddev
);
8271 EXPORT_SYMBOL(md_check_recovery
);
8273 void md_reap_sync_thread(struct mddev
*mddev
)
8275 struct md_rdev
*rdev
;
8277 /* resync has finished, collect result */
8278 md_unregister_thread(&mddev
->sync_thread
);
8279 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
8280 !test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
8282 /* activate any spares */
8283 if (mddev
->pers
->spare_active(mddev
)) {
8284 sysfs_notify(&mddev
->kobj
, NULL
,
8286 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
8289 if (mddev_is_clustered(mddev
))
8290 md_cluster_ops
->metadata_update_start(mddev
);
8291 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
8292 mddev
->pers
->finish_reshape
)
8293 mddev
->pers
->finish_reshape(mddev
);
8295 /* If array is no-longer degraded, then any saved_raid_disk
8296 * information must be scrapped.
8298 if (!mddev
->degraded
)
8299 rdev_for_each(rdev
, mddev
)
8300 rdev
->saved_raid_disk
= -1;
8302 md_update_sb(mddev
, 1);
8303 if (mddev_is_clustered(mddev
))
8304 md_cluster_ops
->metadata_update_finish(mddev
);
8305 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8306 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
8307 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8308 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
8309 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
8310 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
8311 wake_up(&resync_wait
);
8312 /* flag recovery needed just to double check */
8313 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
8314 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
8315 md_new_event(mddev
);
8316 if (mddev
->event_work
.func
)
8317 queue_work(md_misc_wq
, &mddev
->event_work
);
8319 EXPORT_SYMBOL(md_reap_sync_thread
);
8321 void md_wait_for_blocked_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
8323 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
8324 wait_event_timeout(rdev
->blocked_wait
,
8325 !test_bit(Blocked
, &rdev
->flags
) &&
8326 !test_bit(BlockedBadBlocks
, &rdev
->flags
),
8327 msecs_to_jiffies(5000));
8328 rdev_dec_pending(rdev
, mddev
);
8330 EXPORT_SYMBOL(md_wait_for_blocked_rdev
);
8332 void md_finish_reshape(struct mddev
*mddev
)
8334 /* called be personality module when reshape completes. */
8335 struct md_rdev
*rdev
;
8337 rdev_for_each(rdev
, mddev
) {
8338 if (rdev
->data_offset
> rdev
->new_data_offset
)
8339 rdev
->sectors
+= rdev
->data_offset
- rdev
->new_data_offset
;
8341 rdev
->sectors
-= rdev
->new_data_offset
- rdev
->data_offset
;
8342 rdev
->data_offset
= rdev
->new_data_offset
;
8345 EXPORT_SYMBOL(md_finish_reshape
);
8347 /* Bad block management.
8348 * We can record which blocks on each device are 'bad' and so just
8349 * fail those blocks, or that stripe, rather than the whole device.
8350 * Entries in the bad-block table are 64bits wide. This comprises:
8351 * Length of bad-range, in sectors: 0-511 for lengths 1-512
8352 * Start of bad-range, sector offset, 54 bits (allows 8 exbibytes)
8353 * A 'shift' can be set so that larger blocks are tracked and
8354 * consequently larger devices can be covered.
8355 * 'Acknowledged' flag - 1 bit. - the most significant bit.
8357 * Locking of the bad-block table uses a seqlock so md_is_badblock
8358 * might need to retry if it is very unlucky.
8359 * We will sometimes want to check for bad blocks in a bi_end_io function,
8360 * so we use the write_seqlock_irq variant.
8362 * When looking for a bad block we specify a range and want to
8363 * know if any block in the range is bad. So we binary-search
8364 * to the last range that starts at-or-before the given endpoint,
8365 * (or "before the sector after the target range")
8366 * then see if it ends after the given start.
8368 * 0 if there are no known bad blocks in the range
8369 * 1 if there are known bad block which are all acknowledged
8370 * -1 if there are bad blocks which have not yet been acknowledged in metadata.
8371 * plus the start/length of the first bad section we overlap.
8373 int md_is_badblock(struct badblocks
*bb
, sector_t s
, int sectors
,
8374 sector_t
*first_bad
, int *bad_sectors
)
8380 sector_t target
= s
+ sectors
;
8383 if (bb
->shift
> 0) {
8384 /* round the start down, and the end up */
8386 target
+= (1<<bb
->shift
) - 1;
8387 target
>>= bb
->shift
;
8388 sectors
= target
- s
;
8390 /* 'target' is now the first block after the bad range */
8393 seq
= read_seqbegin(&bb
->lock
);
8398 /* Binary search between lo and hi for 'target'
8399 * i.e. for the last range that starts before 'target'
8401 /* INVARIANT: ranges before 'lo' and at-or-after 'hi'
8402 * are known not to be the last range before target.
8403 * VARIANT: hi-lo is the number of possible
8404 * ranges, and decreases until it reaches 1
8406 while (hi
- lo
> 1) {
8407 int mid
= (lo
+ hi
) / 2;
8408 sector_t a
= BB_OFFSET(p
[mid
]);
8410 /* This could still be the one, earlier ranges
8414 /* This and later ranges are definitely out. */
8417 /* 'lo' might be the last that started before target, but 'hi' isn't */
8419 /* need to check all range that end after 's' to see if
8420 * any are unacknowledged.
8423 BB_OFFSET(p
[lo
]) + BB_LEN(p
[lo
]) > s
) {
8424 if (BB_OFFSET(p
[lo
]) < target
) {
8425 /* starts before the end, and finishes after
8426 * the start, so they must overlap
8428 if (rv
!= -1 && BB_ACK(p
[lo
]))
8432 *first_bad
= BB_OFFSET(p
[lo
]);
8433 *bad_sectors
= BB_LEN(p
[lo
]);
8439 if (read_seqretry(&bb
->lock
, seq
))
8444 EXPORT_SYMBOL_GPL(md_is_badblock
);
8447 * Add a range of bad blocks to the table.
8448 * This might extend the table, or might contract it
8449 * if two adjacent ranges can be merged.
8450 * We binary-search to find the 'insertion' point, then
8451 * decide how best to handle it.
8453 static int md_set_badblocks(struct badblocks
*bb
, sector_t s
, int sectors
,
8459 unsigned long flags
;
8462 /* badblocks are disabled */
8466 /* round the start down, and the end up */
8467 sector_t next
= s
+ sectors
;
8469 next
+= (1<<bb
->shift
) - 1;
8474 write_seqlock_irqsave(&bb
->lock
, flags
);
8479 /* Find the last range that starts at-or-before 's' */
8480 while (hi
- lo
> 1) {
8481 int mid
= (lo
+ hi
) / 2;
8482 sector_t a
= BB_OFFSET(p
[mid
]);
8488 if (hi
> lo
&& BB_OFFSET(p
[lo
]) > s
)
8492 /* we found a range that might merge with the start
8495 sector_t a
= BB_OFFSET(p
[lo
]);
8496 sector_t e
= a
+ BB_LEN(p
[lo
]);
8497 int ack
= BB_ACK(p
[lo
]);
8499 /* Yes, we can merge with a previous range */
8500 if (s
== a
&& s
+ sectors
>= e
)
8501 /* new range covers old */
8504 ack
= ack
&& acknowledged
;
8506 if (e
< s
+ sectors
)
8508 if (e
- a
<= BB_MAX_LEN
) {
8509 p
[lo
] = BB_MAKE(a
, e
-a
, ack
);
8512 /* does not all fit in one range,
8513 * make p[lo] maximal
8515 if (BB_LEN(p
[lo
]) != BB_MAX_LEN
)
8516 p
[lo
] = BB_MAKE(a
, BB_MAX_LEN
, ack
);
8522 if (sectors
&& hi
< bb
->count
) {
8523 /* 'hi' points to the first range that starts after 's'.
8524 * Maybe we can merge with the start of that range */
8525 sector_t a
= BB_OFFSET(p
[hi
]);
8526 sector_t e
= a
+ BB_LEN(p
[hi
]);
8527 int ack
= BB_ACK(p
[hi
]);
8528 if (a
<= s
+ sectors
) {
8529 /* merging is possible */
8530 if (e
<= s
+ sectors
) {
8535 ack
= ack
&& acknowledged
;
8538 if (e
- a
<= BB_MAX_LEN
) {
8539 p
[hi
] = BB_MAKE(a
, e
-a
, ack
);
8542 p
[hi
] = BB_MAKE(a
, BB_MAX_LEN
, ack
);
8550 if (sectors
== 0 && hi
< bb
->count
) {
8551 /* we might be able to combine lo and hi */
8552 /* Note: 's' is at the end of 'lo' */
8553 sector_t a
= BB_OFFSET(p
[hi
]);
8554 int lolen
= BB_LEN(p
[lo
]);
8555 int hilen
= BB_LEN(p
[hi
]);
8556 int newlen
= lolen
+ hilen
- (s
- a
);
8557 if (s
>= a
&& newlen
< BB_MAX_LEN
) {
8558 /* yes, we can combine them */
8559 int ack
= BB_ACK(p
[lo
]) && BB_ACK(p
[hi
]);
8560 p
[lo
] = BB_MAKE(BB_OFFSET(p
[lo
]), newlen
, ack
);
8561 memmove(p
+ hi
, p
+ hi
+ 1,
8562 (bb
->count
- hi
- 1) * 8);
8567 /* didn't merge (it all).
8568 * Need to add a range just before 'hi' */
8569 if (bb
->count
>= MD_MAX_BADBLOCKS
) {
8570 /* No room for more */
8574 int this_sectors
= sectors
;
8575 memmove(p
+ hi
+ 1, p
+ hi
,
8576 (bb
->count
- hi
) * 8);
8579 if (this_sectors
> BB_MAX_LEN
)
8580 this_sectors
= BB_MAX_LEN
;
8581 p
[hi
] = BB_MAKE(s
, this_sectors
, acknowledged
);
8582 sectors
-= this_sectors
;
8589 bb
->unacked_exist
= 1;
8590 write_sequnlock_irqrestore(&bb
->lock
, flags
);
8595 int rdev_set_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
8600 s
+= rdev
->new_data_offset
;
8602 s
+= rdev
->data_offset
;
8603 rv
= md_set_badblocks(&rdev
->badblocks
,
8606 /* Make sure they get written out promptly */
8607 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
8608 set_bit(MD_CHANGE_CLEAN
, &rdev
->mddev
->flags
);
8609 set_bit(MD_CHANGE_PENDING
, &rdev
->mddev
->flags
);
8610 md_wakeup_thread(rdev
->mddev
->thread
);
8614 EXPORT_SYMBOL_GPL(rdev_set_badblocks
);
8617 * Remove a range of bad blocks from the table.
8618 * This may involve extending the table if we spilt a region,
8619 * but it must not fail. So if the table becomes full, we just
8620 * drop the remove request.
8622 static int md_clear_badblocks(struct badblocks
*bb
, sector_t s
, int sectors
)
8626 sector_t target
= s
+ sectors
;
8629 if (bb
->shift
> 0) {
8630 /* When clearing we round the start up and the end down.
8631 * This should not matter as the shift should align with
8632 * the block size and no rounding should ever be needed.
8633 * However it is better the think a block is bad when it
8634 * isn't than to think a block is not bad when it is.
8636 s
+= (1<<bb
->shift
) - 1;
8638 target
>>= bb
->shift
;
8639 sectors
= target
- s
;
8642 write_seqlock_irq(&bb
->lock
);
8647 /* Find the last range that starts before 'target' */
8648 while (hi
- lo
> 1) {
8649 int mid
= (lo
+ hi
) / 2;
8650 sector_t a
= BB_OFFSET(p
[mid
]);
8657 /* p[lo] is the last range that could overlap the
8658 * current range. Earlier ranges could also overlap,
8659 * but only this one can overlap the end of the range.
8661 if (BB_OFFSET(p
[lo
]) + BB_LEN(p
[lo
]) > target
) {
8662 /* Partial overlap, leave the tail of this range */
8663 int ack
= BB_ACK(p
[lo
]);
8664 sector_t a
= BB_OFFSET(p
[lo
]);
8665 sector_t end
= a
+ BB_LEN(p
[lo
]);
8668 /* we need to split this range */
8669 if (bb
->count
>= MD_MAX_BADBLOCKS
) {
8673 memmove(p
+lo
+1, p
+lo
, (bb
->count
- lo
) * 8);
8675 p
[lo
] = BB_MAKE(a
, s
-a
, ack
);
8678 p
[lo
] = BB_MAKE(target
, end
- target
, ack
);
8679 /* there is no longer an overlap */
8684 BB_OFFSET(p
[lo
]) + BB_LEN(p
[lo
]) > s
) {
8685 /* This range does overlap */
8686 if (BB_OFFSET(p
[lo
]) < s
) {
8687 /* Keep the early parts of this range. */
8688 int ack
= BB_ACK(p
[lo
]);
8689 sector_t start
= BB_OFFSET(p
[lo
]);
8690 p
[lo
] = BB_MAKE(start
, s
- start
, ack
);
8691 /* now low doesn't overlap, so.. */
8696 /* 'lo' is strictly before, 'hi' is strictly after,
8697 * anything between needs to be discarded
8700 memmove(p
+lo
+1, p
+hi
, (bb
->count
- hi
) * 8);
8701 bb
->count
-= (hi
- lo
- 1);
8707 write_sequnlock_irq(&bb
->lock
);
8711 int rdev_clear_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
8715 s
+= rdev
->new_data_offset
;
8717 s
+= rdev
->data_offset
;
8718 return md_clear_badblocks(&rdev
->badblocks
,
8721 EXPORT_SYMBOL_GPL(rdev_clear_badblocks
);
8724 * Acknowledge all bad blocks in a list.
8725 * This only succeeds if ->changed is clear. It is used by
8726 * in-kernel metadata updates
8728 void md_ack_all_badblocks(struct badblocks
*bb
)
8730 if (bb
->page
== NULL
|| bb
->changed
)
8731 /* no point even trying */
8733 write_seqlock_irq(&bb
->lock
);
8735 if (bb
->changed
== 0 && bb
->unacked_exist
) {
8738 for (i
= 0; i
< bb
->count
; i
++) {
8739 if (!BB_ACK(p
[i
])) {
8740 sector_t start
= BB_OFFSET(p
[i
]);
8741 int len
= BB_LEN(p
[i
]);
8742 p
[i
] = BB_MAKE(start
, len
, 1);
8745 bb
->unacked_exist
= 0;
8747 write_sequnlock_irq(&bb
->lock
);
8749 EXPORT_SYMBOL_GPL(md_ack_all_badblocks
);
8751 /* sysfs access to bad-blocks list.
8752 * We present two files.
8753 * 'bad-blocks' lists sector numbers and lengths of ranges that
8754 * are recorded as bad. The list is truncated to fit within
8755 * the one-page limit of sysfs.
8756 * Writing "sector length" to this file adds an acknowledged
8758 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
8759 * been acknowledged. Writing to this file adds bad blocks
8760 * without acknowledging them. This is largely for testing.
8764 badblocks_show(struct badblocks
*bb
, char *page
, int unack
)
8775 seq
= read_seqbegin(&bb
->lock
);
8780 while (len
< PAGE_SIZE
&& i
< bb
->count
) {
8781 sector_t s
= BB_OFFSET(p
[i
]);
8782 unsigned int length
= BB_LEN(p
[i
]);
8783 int ack
= BB_ACK(p
[i
]);
8789 len
+= snprintf(page
+len
, PAGE_SIZE
-len
, "%llu %u\n",
8790 (unsigned long long)s
<< bb
->shift
,
8791 length
<< bb
->shift
);
8793 if (unack
&& len
== 0)
8794 bb
->unacked_exist
= 0;
8796 if (read_seqretry(&bb
->lock
, seq
))
8805 badblocks_store(struct badblocks
*bb
, const char *page
, size_t len
, int unack
)
8807 unsigned long long sector
;
8811 /* Allow clearing via sysfs *only* for testing/debugging.
8812 * Normally only a successful write may clear a badblock
8815 if (page
[0] == '-') {
8819 #endif /* DO_DEBUG */
8821 switch (sscanf(page
, "%llu %d%c", §or
, &length
, &newline
)) {
8823 if (newline
!= '\n')
8835 md_clear_badblocks(bb
, sector
, length
);
8838 #endif /* DO_DEBUG */
8839 if (md_set_badblocks(bb
, sector
, length
, !unack
))
8845 static int md_notify_reboot(struct notifier_block
*this,
8846 unsigned long code
, void *x
)
8848 struct list_head
*tmp
;
8849 struct mddev
*mddev
;
8852 for_each_mddev(mddev
, tmp
) {
8853 if (mddev_trylock(mddev
)) {
8855 __md_stop_writes(mddev
);
8856 if (mddev
->persistent
)
8857 mddev
->safemode
= 2;
8858 mddev_unlock(mddev
);
8863 * certain more exotic SCSI devices are known to be
8864 * volatile wrt too early system reboots. While the
8865 * right place to handle this issue is the given
8866 * driver, we do want to have a safe RAID driver ...
8874 static struct notifier_block md_notifier
= {
8875 .notifier_call
= md_notify_reboot
,
8877 .priority
= INT_MAX
, /* before any real devices */
8880 static void md_geninit(void)
8882 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
8884 proc_create("mdstat", S_IRUGO
, NULL
, &md_seq_fops
);
8887 static int __init
md_init(void)
8891 md_wq
= alloc_workqueue("md", WQ_MEM_RECLAIM
, 0);
8895 md_misc_wq
= alloc_workqueue("md_misc", 0, 0);
8899 if ((ret
= register_blkdev(MD_MAJOR
, "md")) < 0)
8902 if ((ret
= register_blkdev(0, "mdp")) < 0)
8906 blk_register_region(MKDEV(MD_MAJOR
, 0), 512, THIS_MODULE
,
8907 md_probe
, NULL
, NULL
);
8908 blk_register_region(MKDEV(mdp_major
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
8909 md_probe
, NULL
, NULL
);
8911 register_reboot_notifier(&md_notifier
);
8912 raid_table_header
= register_sysctl_table(raid_root_table
);
8918 unregister_blkdev(MD_MAJOR
, "md");
8920 destroy_workqueue(md_misc_wq
);
8922 destroy_workqueue(md_wq
);
8927 static void check_sb_changes(struct mddev
*mddev
, struct md_rdev
*rdev
)
8929 struct mdp_superblock_1
*sb
= page_address(rdev
->sb_page
);
8930 struct md_rdev
*rdev2
;
8932 char b
[BDEVNAME_SIZE
];
8934 /* Check for change of roles in the active devices */
8935 rdev_for_each(rdev2
, mddev
) {
8936 if (test_bit(Faulty
, &rdev2
->flags
))
8939 /* Check if the roles changed */
8940 role
= le16_to_cpu(sb
->dev_roles
[rdev2
->desc_nr
]);
8941 if (role
!= rdev2
->raid_disk
) {
8943 if (rdev2
->raid_disk
== -1 && role
!= 0xffff) {
8944 rdev2
->saved_raid_disk
= role
;
8945 ret
= remove_and_add_spares(mddev
, rdev2
);
8946 pr_info("Activated spare: %s\n",
8947 bdevname(rdev2
->bdev
,b
));
8951 * We just want to do the minimum to mark the disk
8952 * as faulty. The recovery is performed by the
8953 * one who initiated the error.
8955 if ((role
== 0xfffe) || (role
== 0xfffd)) {
8956 md_error(mddev
, rdev2
);
8957 clear_bit(Blocked
, &rdev2
->flags
);
8962 /* recovery_cp changed */
8963 if (le64_to_cpu(sb
->resync_offset
) != mddev
->recovery_cp
)
8964 mddev
->recovery_cp
= le64_to_cpu(sb
->resync_offset
);
8966 /* Finally set the event to be up to date */
8967 mddev
->events
= le64_to_cpu(sb
->events
);
8970 static int read_rdev(struct mddev
*mddev
, struct md_rdev
*rdev
)
8973 struct page
*swapout
= rdev
->sb_page
;
8974 struct mdp_superblock_1
*sb
;
8976 /* Store the sb page of the rdev in the swapout temporary
8977 * variable in case we err in the future
8979 rdev
->sb_page
= NULL
;
8980 alloc_disk_sb(rdev
);
8981 ClearPageUptodate(rdev
->sb_page
);
8982 rdev
->sb_loaded
= 0;
8983 err
= super_types
[mddev
->major_version
].load_super(rdev
, NULL
, mddev
->minor_version
);
8986 pr_warn("%s: %d Could not reload rdev(%d) err: %d. Restoring old values\n",
8987 __func__
, __LINE__
, rdev
->desc_nr
, err
);
8988 put_page(rdev
->sb_page
);
8989 rdev
->sb_page
= swapout
;
8990 rdev
->sb_loaded
= 1;
8994 sb
= page_address(rdev
->sb_page
);
8995 /* Read the offset unconditionally, even if MD_FEATURE_RECOVERY_OFFSET
8999 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RECOVERY_OFFSET
))
9000 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
9002 /* The other node finished recovery, call spare_active to set
9003 * device In_sync and mddev->degraded
9005 if (rdev
->recovery_offset
== MaxSector
&&
9006 !test_bit(In_sync
, &rdev
->flags
) &&
9007 mddev
->pers
->spare_active(mddev
))
9008 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
9014 void md_reload_sb(struct mddev
*mddev
, int nr
)
9016 struct md_rdev
*rdev
;
9020 rdev_for_each_rcu(rdev
, mddev
) {
9021 if (rdev
->desc_nr
== nr
)
9025 if (!rdev
|| rdev
->desc_nr
!= nr
) {
9026 pr_warn("%s: %d Could not find rdev with nr %d\n", __func__
, __LINE__
, nr
);
9030 err
= read_rdev(mddev
, rdev
);
9034 check_sb_changes(mddev
, rdev
);
9036 /* Read all rdev's to update recovery_offset */
9037 rdev_for_each_rcu(rdev
, mddev
)
9038 read_rdev(mddev
, rdev
);
9040 EXPORT_SYMBOL(md_reload_sb
);
9045 * Searches all registered partitions for autorun RAID arrays
9049 static LIST_HEAD(all_detected_devices
);
9050 struct detected_devices_node
{
9051 struct list_head list
;
9055 void md_autodetect_dev(dev_t dev
)
9057 struct detected_devices_node
*node_detected_dev
;
9059 node_detected_dev
= kzalloc(sizeof(*node_detected_dev
), GFP_KERNEL
);
9060 if (node_detected_dev
) {
9061 node_detected_dev
->dev
= dev
;
9062 list_add_tail(&node_detected_dev
->list
, &all_detected_devices
);
9064 printk(KERN_CRIT
"md: md_autodetect_dev: kzalloc failed"
9065 ", skipping dev(%d,%d)\n", MAJOR(dev
), MINOR(dev
));
9069 static void autostart_arrays(int part
)
9071 struct md_rdev
*rdev
;
9072 struct detected_devices_node
*node_detected_dev
;
9074 int i_scanned
, i_passed
;
9079 printk(KERN_INFO
"md: Autodetecting RAID arrays.\n");
9081 while (!list_empty(&all_detected_devices
) && i_scanned
< INT_MAX
) {
9083 node_detected_dev
= list_entry(all_detected_devices
.next
,
9084 struct detected_devices_node
, list
);
9085 list_del(&node_detected_dev
->list
);
9086 dev
= node_detected_dev
->dev
;
9087 kfree(node_detected_dev
);
9088 rdev
= md_import_device(dev
,0, 90);
9092 if (test_bit(Faulty
, &rdev
->flags
))
9095 set_bit(AutoDetected
, &rdev
->flags
);
9096 list_add(&rdev
->same_set
, &pending_raid_disks
);
9100 printk(KERN_INFO
"md: Scanned %d and added %d devices.\n",
9101 i_scanned
, i_passed
);
9103 autorun_devices(part
);
9106 #endif /* !MODULE */
9108 static __exit
void md_exit(void)
9110 struct mddev
*mddev
;
9111 struct list_head
*tmp
;
9114 blk_unregister_region(MKDEV(MD_MAJOR
,0), 512);
9115 blk_unregister_region(MKDEV(mdp_major
,0), 1U << MINORBITS
);
9117 unregister_blkdev(MD_MAJOR
,"md");
9118 unregister_blkdev(mdp_major
, "mdp");
9119 unregister_reboot_notifier(&md_notifier
);
9120 unregister_sysctl_table(raid_table_header
);
9122 /* We cannot unload the modules while some process is
9123 * waiting for us in select() or poll() - wake them up
9126 while (waitqueue_active(&md_event_waiters
)) {
9127 /* not safe to leave yet */
9128 wake_up(&md_event_waiters
);
9132 remove_proc_entry("mdstat", NULL
);
9134 for_each_mddev(mddev
, tmp
) {
9135 export_array(mddev
);
9136 mddev
->hold_active
= 0;
9138 destroy_workqueue(md_misc_wq
);
9139 destroy_workqueue(md_wq
);
9142 subsys_initcall(md_init
);
9143 module_exit(md_exit
)
9145 static int get_ro(char *buffer
, struct kernel_param
*kp
)
9147 return sprintf(buffer
, "%d", start_readonly
);
9149 static int set_ro(const char *val
, struct kernel_param
*kp
)
9151 return kstrtouint(val
, 10, (unsigned int *)&start_readonly
);
9154 module_param_call(start_ro
, set_ro
, get_ro
, NULL
, S_IRUSR
|S_IWUSR
);
9155 module_param(start_dirty_degraded
, int, S_IRUGO
|S_IWUSR
);
9156 module_param_call(new_array
, add_named_array
, NULL
, NULL
, S_IWUSR
);
9158 MODULE_LICENSE("GPL");
9159 MODULE_DESCRIPTION("MD RAID framework");
9161 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);