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 static bool does_sb_need_changing(struct mddev
*mddev
)
2204 struct md_rdev
*rdev
;
2205 struct mdp_superblock_1
*sb
;
2208 /* Find a good rdev */
2209 rdev_for_each(rdev
, mddev
)
2210 if ((rdev
->raid_disk
>= 0) && !test_bit(Faulty
, &rdev
->flags
))
2213 /* No good device found. */
2217 sb
= page_address(rdev
->sb_page
);
2218 /* Check if a device has become faulty or a spare become active */
2219 rdev_for_each(rdev
, mddev
) {
2220 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
2221 /* Device activated? */
2222 if (role
== 0xffff && rdev
->raid_disk
>=0 &&
2223 !test_bit(Faulty
, &rdev
->flags
))
2225 /* Device turned faulty? */
2226 if (test_bit(Faulty
, &rdev
->flags
) && (role
< 0xfffd))
2230 /* Check if any mddev parameters have changed */
2231 if ((mddev
->dev_sectors
!= le64_to_cpu(sb
->size
)) ||
2232 (mddev
->reshape_position
!= le64_to_cpu(sb
->reshape_position
)) ||
2233 (mddev
->recovery_cp
!= le64_to_cpu(sb
->resync_offset
)) ||
2234 (mddev
->layout
!= le64_to_cpu(sb
->layout
)) ||
2235 (mddev
->raid_disks
!= le32_to_cpu(sb
->raid_disks
)) ||
2236 (mddev
->chunk_sectors
!= le32_to_cpu(sb
->chunksize
)))
2242 void md_update_sb(struct mddev
*mddev
, int force_change
)
2244 struct md_rdev
*rdev
;
2247 int any_badblocks_changed
= 0;
2251 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
2255 if (mddev_is_clustered(mddev
)) {
2256 if (test_and_clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
))
2258 md_cluster_ops
->metadata_update_start(mddev
);
2259 /* Has someone else has updated the sb */
2260 if (!does_sb_need_changing(mddev
)) {
2261 md_cluster_ops
->metadata_update_cancel(mddev
);
2262 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2267 /* First make sure individual recovery_offsets are correct */
2268 rdev_for_each(rdev
, mddev
) {
2269 if (rdev
->raid_disk
>= 0 &&
2270 mddev
->delta_disks
>= 0 &&
2271 !test_bit(In_sync
, &rdev
->flags
) &&
2272 mddev
->curr_resync_completed
> rdev
->recovery_offset
)
2273 rdev
->recovery_offset
= mddev
->curr_resync_completed
;
2276 if (!mddev
->persistent
) {
2277 clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
2278 clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
2279 if (!mddev
->external
) {
2280 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2281 rdev_for_each(rdev
, mddev
) {
2282 if (rdev
->badblocks
.changed
) {
2283 rdev
->badblocks
.changed
= 0;
2284 md_ack_all_badblocks(&rdev
->badblocks
);
2285 md_error(mddev
, rdev
);
2287 clear_bit(Blocked
, &rdev
->flags
);
2288 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2289 wake_up(&rdev
->blocked_wait
);
2292 wake_up(&mddev
->sb_wait
);
2296 spin_lock(&mddev
->lock
);
2298 mddev
->utime
= get_seconds();
2300 if (test_and_clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
))
2302 if (test_and_clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
2303 /* just a clean<-> dirty transition, possibly leave spares alone,
2304 * though if events isn't the right even/odd, we will have to do
2310 if (mddev
->degraded
)
2311 /* If the array is degraded, then skipping spares is both
2312 * dangerous and fairly pointless.
2313 * Dangerous because a device that was removed from the array
2314 * might have a event_count that still looks up-to-date,
2315 * so it can be re-added without a resync.
2316 * Pointless because if there are any spares to skip,
2317 * then a recovery will happen and soon that array won't
2318 * be degraded any more and the spare can go back to sleep then.
2322 sync_req
= mddev
->in_sync
;
2324 /* If this is just a dirty<->clean transition, and the array is clean
2325 * and 'events' is odd, we can roll back to the previous clean state */
2327 && (mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
2328 && mddev
->can_decrease_events
2329 && mddev
->events
!= 1) {
2331 mddev
->can_decrease_events
= 0;
2333 /* otherwise we have to go forward and ... */
2335 mddev
->can_decrease_events
= nospares
;
2339 * This 64-bit counter should never wrap.
2340 * Either we are in around ~1 trillion A.C., assuming
2341 * 1 reboot per second, or we have a bug...
2343 WARN_ON(mddev
->events
== 0);
2345 rdev_for_each(rdev
, mddev
) {
2346 if (rdev
->badblocks
.changed
)
2347 any_badblocks_changed
++;
2348 if (test_bit(Faulty
, &rdev
->flags
))
2349 set_bit(FaultRecorded
, &rdev
->flags
);
2352 sync_sbs(mddev
, nospares
);
2353 spin_unlock(&mddev
->lock
);
2355 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2356 mdname(mddev
), mddev
->in_sync
);
2358 bitmap_update_sb(mddev
->bitmap
);
2359 rdev_for_each(rdev
, mddev
) {
2360 char b
[BDEVNAME_SIZE
];
2362 if (rdev
->sb_loaded
!= 1)
2363 continue; /* no noise on spare devices */
2365 if (!test_bit(Faulty
, &rdev
->flags
)) {
2366 md_super_write(mddev
,rdev
,
2367 rdev
->sb_start
, rdev
->sb_size
,
2369 pr_debug("md: (write) %s's sb offset: %llu\n",
2370 bdevname(rdev
->bdev
, b
),
2371 (unsigned long long)rdev
->sb_start
);
2372 rdev
->sb_events
= mddev
->events
;
2373 if (rdev
->badblocks
.size
) {
2374 md_super_write(mddev
, rdev
,
2375 rdev
->badblocks
.sector
,
2376 rdev
->badblocks
.size
<< 9,
2378 rdev
->badblocks
.size
= 0;
2382 pr_debug("md: %s (skipping faulty)\n",
2383 bdevname(rdev
->bdev
, b
));
2385 if (mddev
->level
== LEVEL_MULTIPATH
)
2386 /* only need to write one superblock... */
2389 md_super_wait(mddev
);
2390 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2392 spin_lock(&mddev
->lock
);
2393 if (mddev
->in_sync
!= sync_req
||
2394 test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
2395 /* have to write it out again */
2396 spin_unlock(&mddev
->lock
);
2399 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2400 spin_unlock(&mddev
->lock
);
2401 wake_up(&mddev
->sb_wait
);
2402 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
2403 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
2405 rdev_for_each(rdev
, mddev
) {
2406 if (test_and_clear_bit(FaultRecorded
, &rdev
->flags
))
2407 clear_bit(Blocked
, &rdev
->flags
);
2409 if (any_badblocks_changed
)
2410 md_ack_all_badblocks(&rdev
->badblocks
);
2411 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2412 wake_up(&rdev
->blocked_wait
);
2415 if (mddev_is_clustered(mddev
))
2416 md_cluster_ops
->metadata_update_finish(mddev
);
2418 EXPORT_SYMBOL(md_update_sb
);
2420 static int add_bound_rdev(struct md_rdev
*rdev
)
2422 struct mddev
*mddev
= rdev
->mddev
;
2425 if (!mddev
->pers
->hot_remove_disk
) {
2426 /* If there is hot_add_disk but no hot_remove_disk
2427 * then added disks for geometry changes,
2428 * and should be added immediately.
2430 super_types
[mddev
->major_version
].
2431 validate_super(mddev
, rdev
);
2432 err
= mddev
->pers
->hot_add_disk(mddev
, rdev
);
2434 unbind_rdev_from_array(rdev
);
2439 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2441 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
2442 if (mddev
->degraded
)
2443 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
2444 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
2445 md_new_event(mddev
);
2446 md_wakeup_thread(mddev
->thread
);
2450 /* words written to sysfs files may, or may not, be \n terminated.
2451 * We want to accept with case. For this we use cmd_match.
2453 static int cmd_match(const char *cmd
, const char *str
)
2455 /* See if cmd, written into a sysfs file, matches
2456 * str. They must either be the same, or cmd can
2457 * have a trailing newline
2459 while (*cmd
&& *str
&& *cmd
== *str
) {
2470 struct rdev_sysfs_entry
{
2471 struct attribute attr
;
2472 ssize_t (*show
)(struct md_rdev
*, char *);
2473 ssize_t (*store
)(struct md_rdev
*, const char *, size_t);
2477 state_show(struct md_rdev
*rdev
, char *page
)
2481 unsigned long flags
= ACCESS_ONCE(rdev
->flags
);
2483 if (test_bit(Faulty
, &flags
) ||
2484 rdev
->badblocks
.unacked_exist
) {
2485 len
+= sprintf(page
+len
, "%sfaulty",sep
);
2488 if (test_bit(In_sync
, &flags
)) {
2489 len
+= sprintf(page
+len
, "%sin_sync",sep
);
2492 if (test_bit(WriteMostly
, &flags
)) {
2493 len
+= sprintf(page
+len
, "%swrite_mostly",sep
);
2496 if (test_bit(Blocked
, &flags
) ||
2497 (rdev
->badblocks
.unacked_exist
2498 && !test_bit(Faulty
, &flags
))) {
2499 len
+= sprintf(page
+len
, "%sblocked", sep
);
2502 if (!test_bit(Faulty
, &flags
) &&
2503 !test_bit(In_sync
, &flags
)) {
2504 len
+= sprintf(page
+len
, "%sspare", sep
);
2507 if (test_bit(WriteErrorSeen
, &flags
)) {
2508 len
+= sprintf(page
+len
, "%swrite_error", sep
);
2511 if (test_bit(WantReplacement
, &flags
)) {
2512 len
+= sprintf(page
+len
, "%swant_replacement", sep
);
2515 if (test_bit(Replacement
, &flags
)) {
2516 len
+= sprintf(page
+len
, "%sreplacement", sep
);
2520 return len
+sprintf(page
+len
, "\n");
2524 state_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2527 * faulty - simulates an error
2528 * remove - disconnects the device
2529 * writemostly - sets write_mostly
2530 * -writemostly - clears write_mostly
2531 * blocked - sets the Blocked flags
2532 * -blocked - clears the Blocked and possibly simulates an error
2533 * insync - sets Insync providing device isn't active
2534 * -insync - clear Insync for a device with a slot assigned,
2535 * so that it gets rebuilt based on bitmap
2536 * write_error - sets WriteErrorSeen
2537 * -write_error - clears WriteErrorSeen
2540 if (cmd_match(buf
, "faulty") && rdev
->mddev
->pers
) {
2541 md_error(rdev
->mddev
, rdev
);
2542 if (test_bit(Faulty
, &rdev
->flags
))
2546 } else if (cmd_match(buf
, "remove")) {
2547 if (rdev
->raid_disk
>= 0)
2550 struct mddev
*mddev
= rdev
->mddev
;
2551 if (mddev_is_clustered(mddev
))
2552 md_cluster_ops
->remove_disk(mddev
, rdev
);
2553 md_kick_rdev_from_array(rdev
);
2555 md_update_sb(mddev
, 1);
2556 md_new_event(mddev
);
2559 } else if (cmd_match(buf
, "writemostly")) {
2560 set_bit(WriteMostly
, &rdev
->flags
);
2562 } else if (cmd_match(buf
, "-writemostly")) {
2563 clear_bit(WriteMostly
, &rdev
->flags
);
2565 } else if (cmd_match(buf
, "blocked")) {
2566 set_bit(Blocked
, &rdev
->flags
);
2568 } else if (cmd_match(buf
, "-blocked")) {
2569 if (!test_bit(Faulty
, &rdev
->flags
) &&
2570 rdev
->badblocks
.unacked_exist
) {
2571 /* metadata handler doesn't understand badblocks,
2572 * so we need to fail the device
2574 md_error(rdev
->mddev
, rdev
);
2576 clear_bit(Blocked
, &rdev
->flags
);
2577 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2578 wake_up(&rdev
->blocked_wait
);
2579 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2580 md_wakeup_thread(rdev
->mddev
->thread
);
2583 } else if (cmd_match(buf
, "insync") && rdev
->raid_disk
== -1) {
2584 set_bit(In_sync
, &rdev
->flags
);
2586 } else if (cmd_match(buf
, "-insync") && rdev
->raid_disk
>= 0) {
2587 if (rdev
->mddev
->pers
== NULL
) {
2588 clear_bit(In_sync
, &rdev
->flags
);
2589 rdev
->saved_raid_disk
= rdev
->raid_disk
;
2590 rdev
->raid_disk
= -1;
2593 } else if (cmd_match(buf
, "write_error")) {
2594 set_bit(WriteErrorSeen
, &rdev
->flags
);
2596 } else if (cmd_match(buf
, "-write_error")) {
2597 clear_bit(WriteErrorSeen
, &rdev
->flags
);
2599 } else if (cmd_match(buf
, "want_replacement")) {
2600 /* Any non-spare device that is not a replacement can
2601 * become want_replacement at any time, but we then need to
2602 * check if recovery is needed.
2604 if (rdev
->raid_disk
>= 0 &&
2605 !test_bit(Replacement
, &rdev
->flags
))
2606 set_bit(WantReplacement
, &rdev
->flags
);
2607 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2608 md_wakeup_thread(rdev
->mddev
->thread
);
2610 } else if (cmd_match(buf
, "-want_replacement")) {
2611 /* Clearing 'want_replacement' is always allowed.
2612 * Once replacements starts it is too late though.
2615 clear_bit(WantReplacement
, &rdev
->flags
);
2616 } else if (cmd_match(buf
, "replacement")) {
2617 /* Can only set a device as a replacement when array has not
2618 * yet been started. Once running, replacement is automatic
2619 * from spares, or by assigning 'slot'.
2621 if (rdev
->mddev
->pers
)
2624 set_bit(Replacement
, &rdev
->flags
);
2627 } else if (cmd_match(buf
, "-replacement")) {
2628 /* Similarly, can only clear Replacement before start */
2629 if (rdev
->mddev
->pers
)
2632 clear_bit(Replacement
, &rdev
->flags
);
2635 } else if (cmd_match(buf
, "re-add")) {
2636 if (test_bit(Faulty
, &rdev
->flags
) && (rdev
->raid_disk
== -1)) {
2637 /* clear_bit is performed _after_ all the devices
2638 * have their local Faulty bit cleared. If any writes
2639 * happen in the meantime in the local node, they
2640 * will land in the local bitmap, which will be synced
2641 * by this node eventually
2643 if (!mddev_is_clustered(rdev
->mddev
) ||
2644 (err
= md_cluster_ops
->gather_bitmaps(rdev
)) == 0) {
2645 clear_bit(Faulty
, &rdev
->flags
);
2646 err
= add_bound_rdev(rdev
);
2652 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2653 return err
? err
: len
;
2655 static struct rdev_sysfs_entry rdev_state
=
2656 __ATTR_PREALLOC(state
, S_IRUGO
|S_IWUSR
, state_show
, state_store
);
2659 errors_show(struct md_rdev
*rdev
, char *page
)
2661 return sprintf(page
, "%d\n", atomic_read(&rdev
->corrected_errors
));
2665 errors_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2670 rv
= kstrtouint(buf
, 10, &n
);
2673 atomic_set(&rdev
->corrected_errors
, n
);
2676 static struct rdev_sysfs_entry rdev_errors
=
2677 __ATTR(errors
, S_IRUGO
|S_IWUSR
, errors_show
, errors_store
);
2680 slot_show(struct md_rdev
*rdev
, char *page
)
2682 if (rdev
->raid_disk
< 0)
2683 return sprintf(page
, "none\n");
2685 return sprintf(page
, "%d\n", rdev
->raid_disk
);
2689 slot_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2694 if (strncmp(buf
, "none", 4)==0)
2697 err
= kstrtouint(buf
, 10, (unsigned int *)&slot
);
2701 if (rdev
->mddev
->pers
&& slot
== -1) {
2702 /* Setting 'slot' on an active array requires also
2703 * updating the 'rd%d' link, and communicating
2704 * with the personality with ->hot_*_disk.
2705 * For now we only support removing
2706 * failed/spare devices. This normally happens automatically,
2707 * but not when the metadata is externally managed.
2709 if (rdev
->raid_disk
== -1)
2711 /* personality does all needed checks */
2712 if (rdev
->mddev
->pers
->hot_remove_disk
== NULL
)
2714 clear_bit(Blocked
, &rdev
->flags
);
2715 remove_and_add_spares(rdev
->mddev
, rdev
);
2716 if (rdev
->raid_disk
>= 0)
2718 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2719 md_wakeup_thread(rdev
->mddev
->thread
);
2720 } else if (rdev
->mddev
->pers
) {
2721 /* Activating a spare .. or possibly reactivating
2722 * if we ever get bitmaps working here.
2725 if (rdev
->raid_disk
!= -1)
2728 if (test_bit(MD_RECOVERY_RUNNING
, &rdev
->mddev
->recovery
))
2731 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
2734 if (slot
>= rdev
->mddev
->raid_disks
&&
2735 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
2738 rdev
->raid_disk
= slot
;
2739 if (test_bit(In_sync
, &rdev
->flags
))
2740 rdev
->saved_raid_disk
= slot
;
2742 rdev
->saved_raid_disk
= -1;
2743 clear_bit(In_sync
, &rdev
->flags
);
2744 clear_bit(Bitmap_sync
, &rdev
->flags
);
2745 remove_and_add_spares(rdev
->mddev
, rdev
);
2746 if (rdev
->raid_disk
== -1)
2748 /* don't wakeup anyone, leave that to userspace. */
2750 if (slot
>= rdev
->mddev
->raid_disks
&&
2751 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
2753 rdev
->raid_disk
= slot
;
2754 /* assume it is working */
2755 clear_bit(Faulty
, &rdev
->flags
);
2756 clear_bit(WriteMostly
, &rdev
->flags
);
2757 set_bit(In_sync
, &rdev
->flags
);
2758 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2763 static struct rdev_sysfs_entry rdev_slot
=
2764 __ATTR(slot
, S_IRUGO
|S_IWUSR
, slot_show
, slot_store
);
2767 offset_show(struct md_rdev
*rdev
, char *page
)
2769 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->data_offset
);
2773 offset_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2775 unsigned long long offset
;
2776 if (kstrtoull(buf
, 10, &offset
) < 0)
2778 if (rdev
->mddev
->pers
&& rdev
->raid_disk
>= 0)
2780 if (rdev
->sectors
&& rdev
->mddev
->external
)
2781 /* Must set offset before size, so overlap checks
2784 rdev
->data_offset
= offset
;
2785 rdev
->new_data_offset
= offset
;
2789 static struct rdev_sysfs_entry rdev_offset
=
2790 __ATTR(offset
, S_IRUGO
|S_IWUSR
, offset_show
, offset_store
);
2792 static ssize_t
new_offset_show(struct md_rdev
*rdev
, char *page
)
2794 return sprintf(page
, "%llu\n",
2795 (unsigned long long)rdev
->new_data_offset
);
2798 static ssize_t
new_offset_store(struct md_rdev
*rdev
,
2799 const char *buf
, size_t len
)
2801 unsigned long long new_offset
;
2802 struct mddev
*mddev
= rdev
->mddev
;
2804 if (kstrtoull(buf
, 10, &new_offset
) < 0)
2807 if (mddev
->sync_thread
||
2808 test_bit(MD_RECOVERY_RUNNING
,&mddev
->recovery
))
2810 if (new_offset
== rdev
->data_offset
)
2811 /* reset is always permitted */
2813 else if (new_offset
> rdev
->data_offset
) {
2814 /* must not push array size beyond rdev_sectors */
2815 if (new_offset
- rdev
->data_offset
2816 + mddev
->dev_sectors
> rdev
->sectors
)
2819 /* Metadata worries about other space details. */
2821 /* decreasing the offset is inconsistent with a backwards
2824 if (new_offset
< rdev
->data_offset
&&
2825 mddev
->reshape_backwards
)
2827 /* Increasing offset is inconsistent with forwards
2828 * reshape. reshape_direction should be set to
2829 * 'backwards' first.
2831 if (new_offset
> rdev
->data_offset
&&
2832 !mddev
->reshape_backwards
)
2835 if (mddev
->pers
&& mddev
->persistent
&&
2836 !super_types
[mddev
->major_version
]
2837 .allow_new_offset(rdev
, new_offset
))
2839 rdev
->new_data_offset
= new_offset
;
2840 if (new_offset
> rdev
->data_offset
)
2841 mddev
->reshape_backwards
= 1;
2842 else if (new_offset
< rdev
->data_offset
)
2843 mddev
->reshape_backwards
= 0;
2847 static struct rdev_sysfs_entry rdev_new_offset
=
2848 __ATTR(new_offset
, S_IRUGO
|S_IWUSR
, new_offset_show
, new_offset_store
);
2851 rdev_size_show(struct md_rdev
*rdev
, char *page
)
2853 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->sectors
/ 2);
2856 static int overlaps(sector_t s1
, sector_t l1
, sector_t s2
, sector_t l2
)
2858 /* check if two start/length pairs overlap */
2866 static int strict_blocks_to_sectors(const char *buf
, sector_t
*sectors
)
2868 unsigned long long blocks
;
2871 if (kstrtoull(buf
, 10, &blocks
) < 0)
2874 if (blocks
& 1ULL << (8 * sizeof(blocks
) - 1))
2875 return -EINVAL
; /* sector conversion overflow */
2878 if (new != blocks
* 2)
2879 return -EINVAL
; /* unsigned long long to sector_t overflow */
2886 rdev_size_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2888 struct mddev
*my_mddev
= rdev
->mddev
;
2889 sector_t oldsectors
= rdev
->sectors
;
2892 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
2894 if (rdev
->data_offset
!= rdev
->new_data_offset
)
2895 return -EINVAL
; /* too confusing */
2896 if (my_mddev
->pers
&& rdev
->raid_disk
>= 0) {
2897 if (my_mddev
->persistent
) {
2898 sectors
= super_types
[my_mddev
->major_version
].
2899 rdev_size_change(rdev
, sectors
);
2902 } else if (!sectors
)
2903 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) -
2905 if (!my_mddev
->pers
->resize
)
2906 /* Cannot change size for RAID0 or Linear etc */
2909 if (sectors
< my_mddev
->dev_sectors
)
2910 return -EINVAL
; /* component must fit device */
2912 rdev
->sectors
= sectors
;
2913 if (sectors
> oldsectors
&& my_mddev
->external
) {
2914 /* Need to check that all other rdevs with the same
2915 * ->bdev do not overlap. 'rcu' is sufficient to walk
2916 * the rdev lists safely.
2917 * This check does not provide a hard guarantee, it
2918 * just helps avoid dangerous mistakes.
2920 struct mddev
*mddev
;
2922 struct list_head
*tmp
;
2925 for_each_mddev(mddev
, tmp
) {
2926 struct md_rdev
*rdev2
;
2928 rdev_for_each(rdev2
, mddev
)
2929 if (rdev
->bdev
== rdev2
->bdev
&&
2931 overlaps(rdev
->data_offset
, rdev
->sectors
,
2944 /* Someone else could have slipped in a size
2945 * change here, but doing so is just silly.
2946 * We put oldsectors back because we *know* it is
2947 * safe, and trust userspace not to race with
2950 rdev
->sectors
= oldsectors
;
2957 static struct rdev_sysfs_entry rdev_size
=
2958 __ATTR(size
, S_IRUGO
|S_IWUSR
, rdev_size_show
, rdev_size_store
);
2960 static ssize_t
recovery_start_show(struct md_rdev
*rdev
, char *page
)
2962 unsigned long long recovery_start
= rdev
->recovery_offset
;
2964 if (test_bit(In_sync
, &rdev
->flags
) ||
2965 recovery_start
== MaxSector
)
2966 return sprintf(page
, "none\n");
2968 return sprintf(page
, "%llu\n", recovery_start
);
2971 static ssize_t
recovery_start_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2973 unsigned long long recovery_start
;
2975 if (cmd_match(buf
, "none"))
2976 recovery_start
= MaxSector
;
2977 else if (kstrtoull(buf
, 10, &recovery_start
))
2980 if (rdev
->mddev
->pers
&&
2981 rdev
->raid_disk
>= 0)
2984 rdev
->recovery_offset
= recovery_start
;
2985 if (recovery_start
== MaxSector
)
2986 set_bit(In_sync
, &rdev
->flags
);
2988 clear_bit(In_sync
, &rdev
->flags
);
2992 static struct rdev_sysfs_entry rdev_recovery_start
=
2993 __ATTR(recovery_start
, S_IRUGO
|S_IWUSR
, recovery_start_show
, recovery_start_store
);
2996 badblocks_show(struct badblocks
*bb
, char *page
, int unack
);
2998 badblocks_store(struct badblocks
*bb
, const char *page
, size_t len
, int unack
);
3000 static ssize_t
bb_show(struct md_rdev
*rdev
, char *page
)
3002 return badblocks_show(&rdev
->badblocks
, page
, 0);
3004 static ssize_t
bb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
3006 int rv
= badblocks_store(&rdev
->badblocks
, page
, len
, 0);
3007 /* Maybe that ack was all we needed */
3008 if (test_and_clear_bit(BlockedBadBlocks
, &rdev
->flags
))
3009 wake_up(&rdev
->blocked_wait
);
3012 static struct rdev_sysfs_entry rdev_bad_blocks
=
3013 __ATTR(bad_blocks
, S_IRUGO
|S_IWUSR
, bb_show
, bb_store
);
3015 static ssize_t
ubb_show(struct md_rdev
*rdev
, char *page
)
3017 return badblocks_show(&rdev
->badblocks
, page
, 1);
3019 static ssize_t
ubb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
3021 return badblocks_store(&rdev
->badblocks
, page
, len
, 1);
3023 static struct rdev_sysfs_entry rdev_unack_bad_blocks
=
3024 __ATTR(unacknowledged_bad_blocks
, S_IRUGO
|S_IWUSR
, ubb_show
, ubb_store
);
3026 static struct attribute
*rdev_default_attrs
[] = {
3031 &rdev_new_offset
.attr
,
3033 &rdev_recovery_start
.attr
,
3034 &rdev_bad_blocks
.attr
,
3035 &rdev_unack_bad_blocks
.attr
,
3039 rdev_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
3041 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
3042 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
3048 return entry
->show(rdev
, page
);
3052 rdev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
3053 const char *page
, size_t length
)
3055 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
3056 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
3058 struct mddev
*mddev
= rdev
->mddev
;
3062 if (!capable(CAP_SYS_ADMIN
))
3064 rv
= mddev
? mddev_lock(mddev
): -EBUSY
;
3066 if (rdev
->mddev
== NULL
)
3069 rv
= entry
->store(rdev
, page
, length
);
3070 mddev_unlock(mddev
);
3075 static void rdev_free(struct kobject
*ko
)
3077 struct md_rdev
*rdev
= container_of(ko
, struct md_rdev
, kobj
);
3080 static const struct sysfs_ops rdev_sysfs_ops
= {
3081 .show
= rdev_attr_show
,
3082 .store
= rdev_attr_store
,
3084 static struct kobj_type rdev_ktype
= {
3085 .release
= rdev_free
,
3086 .sysfs_ops
= &rdev_sysfs_ops
,
3087 .default_attrs
= rdev_default_attrs
,
3090 int md_rdev_init(struct md_rdev
*rdev
)
3093 rdev
->saved_raid_disk
= -1;
3094 rdev
->raid_disk
= -1;
3096 rdev
->data_offset
= 0;
3097 rdev
->new_data_offset
= 0;
3098 rdev
->sb_events
= 0;
3099 rdev
->last_read_error
.tv_sec
= 0;
3100 rdev
->last_read_error
.tv_nsec
= 0;
3101 rdev
->sb_loaded
= 0;
3102 rdev
->bb_page
= NULL
;
3103 atomic_set(&rdev
->nr_pending
, 0);
3104 atomic_set(&rdev
->read_errors
, 0);
3105 atomic_set(&rdev
->corrected_errors
, 0);
3107 INIT_LIST_HEAD(&rdev
->same_set
);
3108 init_waitqueue_head(&rdev
->blocked_wait
);
3110 /* Add space to store bad block list.
3111 * This reserves the space even on arrays where it cannot
3112 * be used - I wonder if that matters
3114 rdev
->badblocks
.count
= 0;
3115 rdev
->badblocks
.shift
= -1; /* disabled until explicitly enabled */
3116 rdev
->badblocks
.page
= kmalloc(PAGE_SIZE
, GFP_KERNEL
);
3117 seqlock_init(&rdev
->badblocks
.lock
);
3118 if (rdev
->badblocks
.page
== NULL
)
3123 EXPORT_SYMBOL_GPL(md_rdev_init
);
3125 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3127 * mark the device faulty if:
3129 * - the device is nonexistent (zero size)
3130 * - the device has no valid superblock
3132 * a faulty rdev _never_ has rdev->sb set.
3134 static struct md_rdev
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
3136 char b
[BDEVNAME_SIZE
];
3138 struct md_rdev
*rdev
;
3141 rdev
= kzalloc(sizeof(*rdev
), GFP_KERNEL
);
3143 printk(KERN_ERR
"md: could not alloc mem for new device!\n");
3144 return ERR_PTR(-ENOMEM
);
3147 err
= md_rdev_init(rdev
);
3150 err
= alloc_disk_sb(rdev
);
3154 err
= lock_rdev(rdev
, newdev
, super_format
== -2);
3158 kobject_init(&rdev
->kobj
, &rdev_ktype
);
3160 size
= i_size_read(rdev
->bdev
->bd_inode
) >> BLOCK_SIZE_BITS
;
3163 "md: %s has zero or unknown size, marking faulty!\n",
3164 bdevname(rdev
->bdev
,b
));
3169 if (super_format
>= 0) {
3170 err
= super_types
[super_format
].
3171 load_super(rdev
, NULL
, super_minor
);
3172 if (err
== -EINVAL
) {
3174 "md: %s does not have a valid v%d.%d "
3175 "superblock, not importing!\n",
3176 bdevname(rdev
->bdev
,b
),
3177 super_format
, super_minor
);
3182 "md: could not read %s's sb, not importing!\n",
3183 bdevname(rdev
->bdev
,b
));
3193 md_rdev_clear(rdev
);
3195 return ERR_PTR(err
);
3199 * Check a full RAID array for plausibility
3202 static void analyze_sbs(struct mddev
*mddev
)
3205 struct md_rdev
*rdev
, *freshest
, *tmp
;
3206 char b
[BDEVNAME_SIZE
];
3209 rdev_for_each_safe(rdev
, tmp
, mddev
)
3210 switch (super_types
[mddev
->major_version
].
3211 load_super(rdev
, freshest
, mddev
->minor_version
)) {
3219 "md: fatal superblock inconsistency in %s"
3220 " -- removing from array\n",
3221 bdevname(rdev
->bdev
,b
));
3222 md_kick_rdev_from_array(rdev
);
3225 super_types
[mddev
->major_version
].
3226 validate_super(mddev
, freshest
);
3229 rdev_for_each_safe(rdev
, tmp
, mddev
) {
3230 if (mddev
->max_disks
&&
3231 (rdev
->desc_nr
>= mddev
->max_disks
||
3232 i
> mddev
->max_disks
)) {
3234 "md: %s: %s: only %d devices permitted\n",
3235 mdname(mddev
), bdevname(rdev
->bdev
, b
),
3237 md_kick_rdev_from_array(rdev
);
3240 if (rdev
!= freshest
) {
3241 if (super_types
[mddev
->major_version
].
3242 validate_super(mddev
, rdev
)) {
3243 printk(KERN_WARNING
"md: kicking non-fresh %s"
3245 bdevname(rdev
->bdev
,b
));
3246 md_kick_rdev_from_array(rdev
);
3249 /* No device should have a Candidate flag
3250 * when reading devices
3252 if (test_bit(Candidate
, &rdev
->flags
)) {
3253 pr_info("md: kicking Cluster Candidate %s from array!\n",
3254 bdevname(rdev
->bdev
, b
));
3255 md_kick_rdev_from_array(rdev
);
3258 if (mddev
->level
== LEVEL_MULTIPATH
) {
3259 rdev
->desc_nr
= i
++;
3260 rdev
->raid_disk
= rdev
->desc_nr
;
3261 set_bit(In_sync
, &rdev
->flags
);
3262 } else if (rdev
->raid_disk
>= (mddev
->raid_disks
- min(0, mddev
->delta_disks
))) {
3263 rdev
->raid_disk
= -1;
3264 clear_bit(In_sync
, &rdev
->flags
);
3269 /* Read a fixed-point number.
3270 * Numbers in sysfs attributes should be in "standard" units where
3271 * possible, so time should be in seconds.
3272 * However we internally use a a much smaller unit such as
3273 * milliseconds or jiffies.
3274 * This function takes a decimal number with a possible fractional
3275 * component, and produces an integer which is the result of
3276 * multiplying that number by 10^'scale'.
3277 * all without any floating-point arithmetic.
3279 int strict_strtoul_scaled(const char *cp
, unsigned long *res
, int scale
)
3281 unsigned long result
= 0;
3283 while (isdigit(*cp
) || (*cp
== '.' && decimals
< 0)) {
3286 else if (decimals
< scale
) {
3289 result
= result
* 10 + value
;
3301 while (decimals
< scale
) {
3310 safe_delay_show(struct mddev
*mddev
, char *page
)
3312 int msec
= (mddev
->safemode_delay
*1000)/HZ
;
3313 return sprintf(page
, "%d.%03d\n", msec
/1000, msec
%1000);
3316 safe_delay_store(struct mddev
*mddev
, const char *cbuf
, size_t len
)
3320 if (strict_strtoul_scaled(cbuf
, &msec
, 3) < 0)
3323 mddev
->safemode_delay
= 0;
3325 unsigned long old_delay
= mddev
->safemode_delay
;
3326 unsigned long new_delay
= (msec
*HZ
)/1000;
3330 mddev
->safemode_delay
= new_delay
;
3331 if (new_delay
< old_delay
|| old_delay
== 0)
3332 mod_timer(&mddev
->safemode_timer
, jiffies
+1);
3336 static struct md_sysfs_entry md_safe_delay
=
3337 __ATTR(safe_mode_delay
, S_IRUGO
|S_IWUSR
,safe_delay_show
, safe_delay_store
);
3340 level_show(struct mddev
*mddev
, char *page
)
3342 struct md_personality
*p
;
3344 spin_lock(&mddev
->lock
);
3347 ret
= sprintf(page
, "%s\n", p
->name
);
3348 else if (mddev
->clevel
[0])
3349 ret
= sprintf(page
, "%s\n", mddev
->clevel
);
3350 else if (mddev
->level
!= LEVEL_NONE
)
3351 ret
= sprintf(page
, "%d\n", mddev
->level
);
3354 spin_unlock(&mddev
->lock
);
3359 level_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3364 struct md_personality
*pers
, *oldpers
;
3366 void *priv
, *oldpriv
;
3367 struct md_rdev
*rdev
;
3369 if (slen
== 0 || slen
>= sizeof(clevel
))
3372 rv
= mddev_lock(mddev
);
3376 if (mddev
->pers
== NULL
) {
3377 strncpy(mddev
->clevel
, buf
, slen
);
3378 if (mddev
->clevel
[slen
-1] == '\n')
3380 mddev
->clevel
[slen
] = 0;
3381 mddev
->level
= LEVEL_NONE
;
3389 /* request to change the personality. Need to ensure:
3390 * - array is not engaged in resync/recovery/reshape
3391 * - old personality can be suspended
3392 * - new personality will access other array.
3396 if (mddev
->sync_thread
||
3397 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
3398 mddev
->reshape_position
!= MaxSector
||
3399 mddev
->sysfs_active
)
3403 if (!mddev
->pers
->quiesce
) {
3404 printk(KERN_WARNING
"md: %s: %s does not support online personality change\n",
3405 mdname(mddev
), mddev
->pers
->name
);
3409 /* Now find the new personality */
3410 strncpy(clevel
, buf
, slen
);
3411 if (clevel
[slen
-1] == '\n')
3414 if (kstrtol(clevel
, 10, &level
))
3417 if (request_module("md-%s", clevel
) != 0)
3418 request_module("md-level-%s", clevel
);
3419 spin_lock(&pers_lock
);
3420 pers
= find_pers(level
, clevel
);
3421 if (!pers
|| !try_module_get(pers
->owner
)) {
3422 spin_unlock(&pers_lock
);
3423 printk(KERN_WARNING
"md: personality %s not loaded\n", clevel
);
3427 spin_unlock(&pers_lock
);
3429 if (pers
== mddev
->pers
) {
3430 /* Nothing to do! */
3431 module_put(pers
->owner
);
3435 if (!pers
->takeover
) {
3436 module_put(pers
->owner
);
3437 printk(KERN_WARNING
"md: %s: %s does not support personality takeover\n",
3438 mdname(mddev
), clevel
);
3443 rdev_for_each(rdev
, mddev
)
3444 rdev
->new_raid_disk
= rdev
->raid_disk
;
3446 /* ->takeover must set new_* and/or delta_disks
3447 * if it succeeds, and may set them when it fails.
3449 priv
= pers
->takeover(mddev
);
3451 mddev
->new_level
= mddev
->level
;
3452 mddev
->new_layout
= mddev
->layout
;
3453 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3454 mddev
->raid_disks
-= mddev
->delta_disks
;
3455 mddev
->delta_disks
= 0;
3456 mddev
->reshape_backwards
= 0;
3457 module_put(pers
->owner
);
3458 printk(KERN_WARNING
"md: %s: %s would not accept array\n",
3459 mdname(mddev
), clevel
);
3464 /* Looks like we have a winner */
3465 mddev_suspend(mddev
);
3466 mddev_detach(mddev
);
3468 spin_lock(&mddev
->lock
);
3469 oldpers
= mddev
->pers
;
3470 oldpriv
= mddev
->private;
3472 mddev
->private = priv
;
3473 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
3474 mddev
->level
= mddev
->new_level
;
3475 mddev
->layout
= mddev
->new_layout
;
3476 mddev
->chunk_sectors
= mddev
->new_chunk_sectors
;
3477 mddev
->delta_disks
= 0;
3478 mddev
->reshape_backwards
= 0;
3479 mddev
->degraded
= 0;
3480 spin_unlock(&mddev
->lock
);
3482 if (oldpers
->sync_request
== NULL
&&
3484 /* We are converting from a no-redundancy array
3485 * to a redundancy array and metadata is managed
3486 * externally so we need to be sure that writes
3487 * won't block due to a need to transition
3489 * until external management is started.
3492 mddev
->safemode_delay
= 0;
3493 mddev
->safemode
= 0;
3496 oldpers
->free(mddev
, oldpriv
);
3498 if (oldpers
->sync_request
== NULL
&&
3499 pers
->sync_request
!= NULL
) {
3500 /* need to add the md_redundancy_group */
3501 if (sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
3503 "md: cannot register extra attributes for %s\n",
3505 mddev
->sysfs_action
= sysfs_get_dirent(mddev
->kobj
.sd
, "sync_action");
3507 if (oldpers
->sync_request
!= NULL
&&
3508 pers
->sync_request
== NULL
) {
3509 /* need to remove the md_redundancy_group */
3510 if (mddev
->to_remove
== NULL
)
3511 mddev
->to_remove
= &md_redundancy_group
;
3514 rdev_for_each(rdev
, mddev
) {
3515 if (rdev
->raid_disk
< 0)
3517 if (rdev
->new_raid_disk
>= mddev
->raid_disks
)
3518 rdev
->new_raid_disk
= -1;
3519 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3521 sysfs_unlink_rdev(mddev
, rdev
);
3523 rdev_for_each(rdev
, mddev
) {
3524 if (rdev
->raid_disk
< 0)
3526 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3528 rdev
->raid_disk
= rdev
->new_raid_disk
;
3529 if (rdev
->raid_disk
< 0)
3530 clear_bit(In_sync
, &rdev
->flags
);
3532 if (sysfs_link_rdev(mddev
, rdev
))
3533 printk(KERN_WARNING
"md: cannot register rd%d"
3534 " for %s after level change\n",
3535 rdev
->raid_disk
, mdname(mddev
));
3539 if (pers
->sync_request
== NULL
) {
3540 /* this is now an array without redundancy, so
3541 * it must always be in_sync
3544 del_timer_sync(&mddev
->safemode_timer
);
3546 blk_set_stacking_limits(&mddev
->queue
->limits
);
3548 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
3549 mddev_resume(mddev
);
3551 md_update_sb(mddev
, 1);
3552 sysfs_notify(&mddev
->kobj
, NULL
, "level");
3553 md_new_event(mddev
);
3556 mddev_unlock(mddev
);
3560 static struct md_sysfs_entry md_level
=
3561 __ATTR(level
, S_IRUGO
|S_IWUSR
, level_show
, level_store
);
3564 layout_show(struct mddev
*mddev
, char *page
)
3566 /* just a number, not meaningful for all levels */
3567 if (mddev
->reshape_position
!= MaxSector
&&
3568 mddev
->layout
!= mddev
->new_layout
)
3569 return sprintf(page
, "%d (%d)\n",
3570 mddev
->new_layout
, mddev
->layout
);
3571 return sprintf(page
, "%d\n", mddev
->layout
);
3575 layout_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3580 err
= kstrtouint(buf
, 10, &n
);
3583 err
= mddev_lock(mddev
);
3588 if (mddev
->pers
->check_reshape
== NULL
)
3593 mddev
->new_layout
= n
;
3594 err
= mddev
->pers
->check_reshape(mddev
);
3596 mddev
->new_layout
= mddev
->layout
;
3599 mddev
->new_layout
= n
;
3600 if (mddev
->reshape_position
== MaxSector
)
3603 mddev_unlock(mddev
);
3606 static struct md_sysfs_entry md_layout
=
3607 __ATTR(layout
, S_IRUGO
|S_IWUSR
, layout_show
, layout_store
);
3610 raid_disks_show(struct mddev
*mddev
, char *page
)
3612 if (mddev
->raid_disks
== 0)
3614 if (mddev
->reshape_position
!= MaxSector
&&
3615 mddev
->delta_disks
!= 0)
3616 return sprintf(page
, "%d (%d)\n", mddev
->raid_disks
,
3617 mddev
->raid_disks
- mddev
->delta_disks
);
3618 return sprintf(page
, "%d\n", mddev
->raid_disks
);
3621 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
);
3624 raid_disks_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3629 err
= kstrtouint(buf
, 10, &n
);
3633 err
= mddev_lock(mddev
);
3637 err
= update_raid_disks(mddev
, n
);
3638 else if (mddev
->reshape_position
!= MaxSector
) {
3639 struct md_rdev
*rdev
;
3640 int olddisks
= mddev
->raid_disks
- mddev
->delta_disks
;
3643 rdev_for_each(rdev
, mddev
) {
3645 rdev
->data_offset
< rdev
->new_data_offset
)
3648 rdev
->data_offset
> rdev
->new_data_offset
)
3652 mddev
->delta_disks
= n
- olddisks
;
3653 mddev
->raid_disks
= n
;
3654 mddev
->reshape_backwards
= (mddev
->delta_disks
< 0);
3656 mddev
->raid_disks
= n
;
3658 mddev_unlock(mddev
);
3659 return err
? err
: len
;
3661 static struct md_sysfs_entry md_raid_disks
=
3662 __ATTR(raid_disks
, S_IRUGO
|S_IWUSR
, raid_disks_show
, raid_disks_store
);
3665 chunk_size_show(struct mddev
*mddev
, char *page
)
3667 if (mddev
->reshape_position
!= MaxSector
&&
3668 mddev
->chunk_sectors
!= mddev
->new_chunk_sectors
)
3669 return sprintf(page
, "%d (%d)\n",
3670 mddev
->new_chunk_sectors
<< 9,
3671 mddev
->chunk_sectors
<< 9);
3672 return sprintf(page
, "%d\n", mddev
->chunk_sectors
<< 9);
3676 chunk_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3681 err
= kstrtoul(buf
, 10, &n
);
3685 err
= mddev_lock(mddev
);
3689 if (mddev
->pers
->check_reshape
== NULL
)
3694 mddev
->new_chunk_sectors
= n
>> 9;
3695 err
= mddev
->pers
->check_reshape(mddev
);
3697 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3700 mddev
->new_chunk_sectors
= n
>> 9;
3701 if (mddev
->reshape_position
== MaxSector
)
3702 mddev
->chunk_sectors
= n
>> 9;
3704 mddev_unlock(mddev
);
3707 static struct md_sysfs_entry md_chunk_size
=
3708 __ATTR(chunk_size
, S_IRUGO
|S_IWUSR
, chunk_size_show
, chunk_size_store
);
3711 resync_start_show(struct mddev
*mddev
, char *page
)
3713 if (mddev
->recovery_cp
== MaxSector
)
3714 return sprintf(page
, "none\n");
3715 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->recovery_cp
);
3719 resync_start_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3721 unsigned long long n
;
3724 if (cmd_match(buf
, "none"))
3727 err
= kstrtoull(buf
, 10, &n
);
3730 if (n
!= (sector_t
)n
)
3734 err
= mddev_lock(mddev
);
3737 if (mddev
->pers
&& !test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
3741 mddev
->recovery_cp
= n
;
3743 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
3745 mddev_unlock(mddev
);
3748 static struct md_sysfs_entry md_resync_start
=
3749 __ATTR_PREALLOC(resync_start
, S_IRUGO
|S_IWUSR
,
3750 resync_start_show
, resync_start_store
);
3753 * The array state can be:
3756 * No devices, no size, no level
3757 * Equivalent to STOP_ARRAY ioctl
3759 * May have some settings, but array is not active
3760 * all IO results in error
3761 * When written, doesn't tear down array, but just stops it
3762 * suspended (not supported yet)
3763 * All IO requests will block. The array can be reconfigured.
3764 * Writing this, if accepted, will block until array is quiescent
3766 * no resync can happen. no superblocks get written.
3767 * write requests fail
3769 * like readonly, but behaves like 'clean' on a write request.
3771 * clean - no pending writes, but otherwise active.
3772 * When written to inactive array, starts without resync
3773 * If a write request arrives then
3774 * if metadata is known, mark 'dirty' and switch to 'active'.
3775 * if not known, block and switch to write-pending
3776 * If written to an active array that has pending writes, then fails.
3778 * fully active: IO and resync can be happening.
3779 * When written to inactive array, starts with resync
3782 * clean, but writes are blocked waiting for 'active' to be written.
3785 * like active, but no writes have been seen for a while (100msec).
3788 enum array_state
{ clear
, inactive
, suspended
, readonly
, read_auto
, clean
, active
,
3789 write_pending
, active_idle
, bad_word
};
3790 static char *array_states
[] = {
3791 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3792 "write-pending", "active-idle", NULL
};
3794 static int match_word(const char *word
, char **list
)
3797 for (n
=0; list
[n
]; n
++)
3798 if (cmd_match(word
, list
[n
]))
3804 array_state_show(struct mddev
*mddev
, char *page
)
3806 enum array_state st
= inactive
;
3819 else if (test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
3821 else if (mddev
->safemode
)
3827 if (list_empty(&mddev
->disks
) &&
3828 mddev
->raid_disks
== 0 &&
3829 mddev
->dev_sectors
== 0)
3834 return sprintf(page
, "%s\n", array_states
[st
]);
3837 static int do_md_stop(struct mddev
*mddev
, int ro
, struct block_device
*bdev
);
3838 static int md_set_readonly(struct mddev
*mddev
, struct block_device
*bdev
);
3839 static int do_md_run(struct mddev
*mddev
);
3840 static int restart_array(struct mddev
*mddev
);
3843 array_state_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3846 enum array_state st
= match_word(buf
, array_states
);
3848 if (mddev
->pers
&& (st
== active
|| st
== clean
) && mddev
->ro
!= 1) {
3849 /* don't take reconfig_mutex when toggling between
3852 spin_lock(&mddev
->lock
);
3854 restart_array(mddev
);
3855 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
3856 wake_up(&mddev
->sb_wait
);
3858 } else /* st == clean */ {
3859 restart_array(mddev
);
3860 if (atomic_read(&mddev
->writes_pending
) == 0) {
3861 if (mddev
->in_sync
== 0) {
3863 if (mddev
->safemode
== 1)
3864 mddev
->safemode
= 0;
3865 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
3871 spin_unlock(&mddev
->lock
);
3874 err
= mddev_lock(mddev
);
3882 /* stopping an active array */
3883 err
= do_md_stop(mddev
, 0, NULL
);
3886 /* stopping an active array */
3888 err
= do_md_stop(mddev
, 2, NULL
);
3890 err
= 0; /* already inactive */
3893 break; /* not supported yet */
3896 err
= md_set_readonly(mddev
, NULL
);
3899 set_disk_ro(mddev
->gendisk
, 1);
3900 err
= do_md_run(mddev
);
3906 err
= md_set_readonly(mddev
, NULL
);
3907 else if (mddev
->ro
== 1)
3908 err
= restart_array(mddev
);
3911 set_disk_ro(mddev
->gendisk
, 0);
3915 err
= do_md_run(mddev
);
3920 restart_array(mddev
);
3921 spin_lock(&mddev
->lock
);
3922 if (atomic_read(&mddev
->writes_pending
) == 0) {
3923 if (mddev
->in_sync
== 0) {
3925 if (mddev
->safemode
== 1)
3926 mddev
->safemode
= 0;
3927 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
3932 spin_unlock(&mddev
->lock
);
3938 restart_array(mddev
);
3939 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
3940 wake_up(&mddev
->sb_wait
);
3944 set_disk_ro(mddev
->gendisk
, 0);
3945 err
= do_md_run(mddev
);
3950 /* these cannot be set */
3955 if (mddev
->hold_active
== UNTIL_IOCTL
)
3956 mddev
->hold_active
= 0;
3957 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
3959 mddev_unlock(mddev
);
3962 static struct md_sysfs_entry md_array_state
=
3963 __ATTR_PREALLOC(array_state
, S_IRUGO
|S_IWUSR
, array_state_show
, array_state_store
);
3966 max_corrected_read_errors_show(struct mddev
*mddev
, char *page
) {
3967 return sprintf(page
, "%d\n",
3968 atomic_read(&mddev
->max_corr_read_errors
));
3972 max_corrected_read_errors_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3977 rv
= kstrtouint(buf
, 10, &n
);
3980 atomic_set(&mddev
->max_corr_read_errors
, n
);
3984 static struct md_sysfs_entry max_corr_read_errors
=
3985 __ATTR(max_read_errors
, S_IRUGO
|S_IWUSR
, max_corrected_read_errors_show
,
3986 max_corrected_read_errors_store
);
3989 null_show(struct mddev
*mddev
, char *page
)
3995 new_dev_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3997 /* buf must be %d:%d\n? giving major and minor numbers */
3998 /* The new device is added to the array.
3999 * If the array has a persistent superblock, we read the
4000 * superblock to initialise info and check validity.
4001 * Otherwise, only checking done is that in bind_rdev_to_array,
4002 * which mainly checks size.
4005 int major
= simple_strtoul(buf
, &e
, 10);
4008 struct md_rdev
*rdev
;
4011 if (!*buf
|| *e
!= ':' || !e
[1] || e
[1] == '\n')
4013 minor
= simple_strtoul(e
+1, &e
, 10);
4014 if (*e
&& *e
!= '\n')
4016 dev
= MKDEV(major
, minor
);
4017 if (major
!= MAJOR(dev
) ||
4018 minor
!= MINOR(dev
))
4021 flush_workqueue(md_misc_wq
);
4023 err
= mddev_lock(mddev
);
4026 if (mddev
->persistent
) {
4027 rdev
= md_import_device(dev
, mddev
->major_version
,
4028 mddev
->minor_version
);
4029 if (!IS_ERR(rdev
) && !list_empty(&mddev
->disks
)) {
4030 struct md_rdev
*rdev0
4031 = list_entry(mddev
->disks
.next
,
4032 struct md_rdev
, same_set
);
4033 err
= super_types
[mddev
->major_version
]
4034 .load_super(rdev
, rdev0
, mddev
->minor_version
);
4038 } else if (mddev
->external
)
4039 rdev
= md_import_device(dev
, -2, -1);
4041 rdev
= md_import_device(dev
, -1, -1);
4044 mddev_unlock(mddev
);
4045 return PTR_ERR(rdev
);
4047 err
= bind_rdev_to_array(rdev
, mddev
);
4051 mddev_unlock(mddev
);
4052 return err
? err
: len
;
4055 static struct md_sysfs_entry md_new_device
=
4056 __ATTR(new_dev
, S_IWUSR
, null_show
, new_dev_store
);
4059 bitmap_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4062 unsigned long chunk
, end_chunk
;
4065 err
= mddev_lock(mddev
);
4070 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
4072 chunk
= end_chunk
= simple_strtoul(buf
, &end
, 0);
4073 if (buf
== end
) break;
4074 if (*end
== '-') { /* range */
4076 end_chunk
= simple_strtoul(buf
, &end
, 0);
4077 if (buf
== end
) break;
4079 if (*end
&& !isspace(*end
)) break;
4080 bitmap_dirty_bits(mddev
->bitmap
, chunk
, end_chunk
);
4081 buf
= skip_spaces(end
);
4083 bitmap_unplug(mddev
->bitmap
); /* flush the bits to disk */
4085 mddev_unlock(mddev
);
4089 static struct md_sysfs_entry md_bitmap
=
4090 __ATTR(bitmap_set_bits
, S_IWUSR
, null_show
, bitmap_store
);
4093 size_show(struct mddev
*mddev
, char *page
)
4095 return sprintf(page
, "%llu\n",
4096 (unsigned long long)mddev
->dev_sectors
/ 2);
4099 static int update_size(struct mddev
*mddev
, sector_t num_sectors
);
4102 size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4104 /* If array is inactive, we can reduce the component size, but
4105 * not increase it (except from 0).
4106 * If array is active, we can try an on-line resize
4109 int err
= strict_blocks_to_sectors(buf
, §ors
);
4113 err
= mddev_lock(mddev
);
4117 err
= update_size(mddev
, sectors
);
4118 md_update_sb(mddev
, 1);
4120 if (mddev
->dev_sectors
== 0 ||
4121 mddev
->dev_sectors
> sectors
)
4122 mddev
->dev_sectors
= sectors
;
4126 mddev_unlock(mddev
);
4127 return err
? err
: len
;
4130 static struct md_sysfs_entry md_size
=
4131 __ATTR(component_size
, S_IRUGO
|S_IWUSR
, size_show
, size_store
);
4133 /* Metadata version.
4135 * 'none' for arrays with no metadata (good luck...)
4136 * 'external' for arrays with externally managed metadata,
4137 * or N.M for internally known formats
4140 metadata_show(struct mddev
*mddev
, char *page
)
4142 if (mddev
->persistent
)
4143 return sprintf(page
, "%d.%d\n",
4144 mddev
->major_version
, mddev
->minor_version
);
4145 else if (mddev
->external
)
4146 return sprintf(page
, "external:%s\n", mddev
->metadata_type
);
4148 return sprintf(page
, "none\n");
4152 metadata_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4157 /* Changing the details of 'external' metadata is
4158 * always permitted. Otherwise there must be
4159 * no devices attached to the array.
4162 err
= mddev_lock(mddev
);
4166 if (mddev
->external
&& strncmp(buf
, "external:", 9) == 0)
4168 else if (!list_empty(&mddev
->disks
))
4172 if (cmd_match(buf
, "none")) {
4173 mddev
->persistent
= 0;
4174 mddev
->external
= 0;
4175 mddev
->major_version
= 0;
4176 mddev
->minor_version
= 90;
4179 if (strncmp(buf
, "external:", 9) == 0) {
4180 size_t namelen
= len
-9;
4181 if (namelen
>= sizeof(mddev
->metadata_type
))
4182 namelen
= sizeof(mddev
->metadata_type
)-1;
4183 strncpy(mddev
->metadata_type
, buf
+9, namelen
);
4184 mddev
->metadata_type
[namelen
] = 0;
4185 if (namelen
&& mddev
->metadata_type
[namelen
-1] == '\n')
4186 mddev
->metadata_type
[--namelen
] = 0;
4187 mddev
->persistent
= 0;
4188 mddev
->external
= 1;
4189 mddev
->major_version
= 0;
4190 mddev
->minor_version
= 90;
4193 major
= simple_strtoul(buf
, &e
, 10);
4195 if (e
==buf
|| *e
!= '.')
4198 minor
= simple_strtoul(buf
, &e
, 10);
4199 if (e
==buf
|| (*e
&& *e
!= '\n') )
4202 if (major
>= ARRAY_SIZE(super_types
) || super_types
[major
].name
== NULL
)
4204 mddev
->major_version
= major
;
4205 mddev
->minor_version
= minor
;
4206 mddev
->persistent
= 1;
4207 mddev
->external
= 0;
4210 mddev_unlock(mddev
);
4214 static struct md_sysfs_entry md_metadata
=
4215 __ATTR_PREALLOC(metadata_version
, S_IRUGO
|S_IWUSR
, metadata_show
, metadata_store
);
4218 action_show(struct mddev
*mddev
, char *page
)
4220 char *type
= "idle";
4221 unsigned long recovery
= mddev
->recovery
;
4222 if (test_bit(MD_RECOVERY_FROZEN
, &recovery
))
4224 else if (test_bit(MD_RECOVERY_RUNNING
, &recovery
) ||
4225 (!mddev
->ro
&& test_bit(MD_RECOVERY_NEEDED
, &recovery
))) {
4226 if (test_bit(MD_RECOVERY_RESHAPE
, &recovery
))
4228 else if (test_bit(MD_RECOVERY_SYNC
, &recovery
)) {
4229 if (!test_bit(MD_RECOVERY_REQUESTED
, &recovery
))
4231 else if (test_bit(MD_RECOVERY_CHECK
, &recovery
))
4235 } else if (test_bit(MD_RECOVERY_RECOVER
, &recovery
))
4237 else if (mddev
->reshape_position
!= MaxSector
)
4240 return sprintf(page
, "%s\n", type
);
4244 action_store(struct mddev
*mddev
, const char *page
, size_t len
)
4246 if (!mddev
->pers
|| !mddev
->pers
->sync_request
)
4250 if (cmd_match(page
, "idle") || cmd_match(page
, "frozen")) {
4251 if (cmd_match(page
, "frozen"))
4252 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4254 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4255 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
4256 mddev_lock(mddev
) == 0) {
4257 flush_workqueue(md_misc_wq
);
4258 if (mddev
->sync_thread
) {
4259 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4260 md_reap_sync_thread(mddev
);
4262 mddev_unlock(mddev
);
4264 } else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
4265 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
4267 else if (cmd_match(page
, "resync"))
4268 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4269 else if (cmd_match(page
, "recover")) {
4270 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4271 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
4272 } else if (cmd_match(page
, "reshape")) {
4274 if (mddev
->pers
->start_reshape
== NULL
)
4276 err
= mddev_lock(mddev
);
4278 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4279 err
= mddev
->pers
->start_reshape(mddev
);
4280 mddev_unlock(mddev
);
4284 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
4286 if (cmd_match(page
, "check"))
4287 set_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
4288 else if (!cmd_match(page
, "repair"))
4290 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4291 set_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
4292 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
4294 if (mddev
->ro
== 2) {
4295 /* A write to sync_action is enough to justify
4296 * canceling read-auto mode
4299 md_wakeup_thread(mddev
->sync_thread
);
4301 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4302 md_wakeup_thread(mddev
->thread
);
4303 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
4307 static struct md_sysfs_entry md_scan_mode
=
4308 __ATTR_PREALLOC(sync_action
, S_IRUGO
|S_IWUSR
, action_show
, action_store
);
4311 last_sync_action_show(struct mddev
*mddev
, char *page
)
4313 return sprintf(page
, "%s\n", mddev
->last_sync_action
);
4316 static struct md_sysfs_entry md_last_scan_mode
= __ATTR_RO(last_sync_action
);
4319 mismatch_cnt_show(struct mddev
*mddev
, char *page
)
4321 return sprintf(page
, "%llu\n",
4322 (unsigned long long)
4323 atomic64_read(&mddev
->resync_mismatches
));
4326 static struct md_sysfs_entry md_mismatches
= __ATTR_RO(mismatch_cnt
);
4329 sync_min_show(struct mddev
*mddev
, char *page
)
4331 return sprintf(page
, "%d (%s)\n", speed_min(mddev
),
4332 mddev
->sync_speed_min
? "local": "system");
4336 sync_min_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4341 if (strncmp(buf
, "system", 6)==0) {
4344 rv
= kstrtouint(buf
, 10, &min
);
4350 mddev
->sync_speed_min
= min
;
4354 static struct md_sysfs_entry md_sync_min
=
4355 __ATTR(sync_speed_min
, S_IRUGO
|S_IWUSR
, sync_min_show
, sync_min_store
);
4358 sync_max_show(struct mddev
*mddev
, char *page
)
4360 return sprintf(page
, "%d (%s)\n", speed_max(mddev
),
4361 mddev
->sync_speed_max
? "local": "system");
4365 sync_max_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4370 if (strncmp(buf
, "system", 6)==0) {
4373 rv
= kstrtouint(buf
, 10, &max
);
4379 mddev
->sync_speed_max
= max
;
4383 static struct md_sysfs_entry md_sync_max
=
4384 __ATTR(sync_speed_max
, S_IRUGO
|S_IWUSR
, sync_max_show
, sync_max_store
);
4387 degraded_show(struct mddev
*mddev
, char *page
)
4389 return sprintf(page
, "%d\n", mddev
->degraded
);
4391 static struct md_sysfs_entry md_degraded
= __ATTR_RO(degraded
);
4394 sync_force_parallel_show(struct mddev
*mddev
, char *page
)
4396 return sprintf(page
, "%d\n", mddev
->parallel_resync
);
4400 sync_force_parallel_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4404 if (kstrtol(buf
, 10, &n
))
4407 if (n
!= 0 && n
!= 1)
4410 mddev
->parallel_resync
= n
;
4412 if (mddev
->sync_thread
)
4413 wake_up(&resync_wait
);
4418 /* force parallel resync, even with shared block devices */
4419 static struct md_sysfs_entry md_sync_force_parallel
=
4420 __ATTR(sync_force_parallel
, S_IRUGO
|S_IWUSR
,
4421 sync_force_parallel_show
, sync_force_parallel_store
);
4424 sync_speed_show(struct mddev
*mddev
, char *page
)
4426 unsigned long resync
, dt
, db
;
4427 if (mddev
->curr_resync
== 0)
4428 return sprintf(page
, "none\n");
4429 resync
= mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
);
4430 dt
= (jiffies
- mddev
->resync_mark
) / HZ
;
4432 db
= resync
- mddev
->resync_mark_cnt
;
4433 return sprintf(page
, "%lu\n", db
/dt
/2); /* K/sec */
4436 static struct md_sysfs_entry md_sync_speed
= __ATTR_RO(sync_speed
);
4439 sync_completed_show(struct mddev
*mddev
, char *page
)
4441 unsigned long long max_sectors
, resync
;
4443 if (!test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4444 return sprintf(page
, "none\n");
4446 if (mddev
->curr_resync
== 1 ||
4447 mddev
->curr_resync
== 2)
4448 return sprintf(page
, "delayed\n");
4450 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
4451 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
4452 max_sectors
= mddev
->resync_max_sectors
;
4454 max_sectors
= mddev
->dev_sectors
;
4456 resync
= mddev
->curr_resync_completed
;
4457 return sprintf(page
, "%llu / %llu\n", resync
, max_sectors
);
4460 static struct md_sysfs_entry md_sync_completed
=
4461 __ATTR_PREALLOC(sync_completed
, S_IRUGO
, sync_completed_show
, NULL
);
4464 min_sync_show(struct mddev
*mddev
, char *page
)
4466 return sprintf(page
, "%llu\n",
4467 (unsigned long long)mddev
->resync_min
);
4470 min_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4472 unsigned long long min
;
4475 if (kstrtoull(buf
, 10, &min
))
4478 spin_lock(&mddev
->lock
);
4480 if (min
> mddev
->resync_max
)
4484 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4487 /* Round down to multiple of 4K for safety */
4488 mddev
->resync_min
= round_down(min
, 8);
4492 spin_unlock(&mddev
->lock
);
4496 static struct md_sysfs_entry md_min_sync
=
4497 __ATTR(sync_min
, S_IRUGO
|S_IWUSR
, min_sync_show
, min_sync_store
);
4500 max_sync_show(struct mddev
*mddev
, char *page
)
4502 if (mddev
->resync_max
== MaxSector
)
4503 return sprintf(page
, "max\n");
4505 return sprintf(page
, "%llu\n",
4506 (unsigned long long)mddev
->resync_max
);
4509 max_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4512 spin_lock(&mddev
->lock
);
4513 if (strncmp(buf
, "max", 3) == 0)
4514 mddev
->resync_max
= MaxSector
;
4516 unsigned long long max
;
4520 if (kstrtoull(buf
, 10, &max
))
4522 if (max
< mddev
->resync_min
)
4526 if (max
< mddev
->resync_max
&&
4528 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4531 /* Must be a multiple of chunk_size */
4532 chunk
= mddev
->chunk_sectors
;
4534 sector_t temp
= max
;
4537 if (sector_div(temp
, chunk
))
4540 mddev
->resync_max
= max
;
4542 wake_up(&mddev
->recovery_wait
);
4545 spin_unlock(&mddev
->lock
);
4549 static struct md_sysfs_entry md_max_sync
=
4550 __ATTR(sync_max
, S_IRUGO
|S_IWUSR
, max_sync_show
, max_sync_store
);
4553 suspend_lo_show(struct mddev
*mddev
, char *page
)
4555 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_lo
);
4559 suspend_lo_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4561 unsigned long long old
, new;
4564 err
= kstrtoull(buf
, 10, &new);
4567 if (new != (sector_t
)new)
4570 err
= mddev_lock(mddev
);
4574 if (mddev
->pers
== NULL
||
4575 mddev
->pers
->quiesce
== NULL
)
4577 old
= mddev
->suspend_lo
;
4578 mddev
->suspend_lo
= new;
4580 /* Shrinking suspended region */
4581 mddev
->pers
->quiesce(mddev
, 2);
4583 /* Expanding suspended region - need to wait */
4584 mddev
->pers
->quiesce(mddev
, 1);
4585 mddev
->pers
->quiesce(mddev
, 0);
4589 mddev_unlock(mddev
);
4592 static struct md_sysfs_entry md_suspend_lo
=
4593 __ATTR(suspend_lo
, S_IRUGO
|S_IWUSR
, suspend_lo_show
, suspend_lo_store
);
4596 suspend_hi_show(struct mddev
*mddev
, char *page
)
4598 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_hi
);
4602 suspend_hi_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4604 unsigned long long old
, new;
4607 err
= kstrtoull(buf
, 10, &new);
4610 if (new != (sector_t
)new)
4613 err
= mddev_lock(mddev
);
4617 if (mddev
->pers
== NULL
||
4618 mddev
->pers
->quiesce
== NULL
)
4620 old
= mddev
->suspend_hi
;
4621 mddev
->suspend_hi
= new;
4623 /* Shrinking suspended region */
4624 mddev
->pers
->quiesce(mddev
, 2);
4626 /* Expanding suspended region - need to wait */
4627 mddev
->pers
->quiesce(mddev
, 1);
4628 mddev
->pers
->quiesce(mddev
, 0);
4632 mddev_unlock(mddev
);
4635 static struct md_sysfs_entry md_suspend_hi
=
4636 __ATTR(suspend_hi
, S_IRUGO
|S_IWUSR
, suspend_hi_show
, suspend_hi_store
);
4639 reshape_position_show(struct mddev
*mddev
, char *page
)
4641 if (mddev
->reshape_position
!= MaxSector
)
4642 return sprintf(page
, "%llu\n",
4643 (unsigned long long)mddev
->reshape_position
);
4644 strcpy(page
, "none\n");
4649 reshape_position_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4651 struct md_rdev
*rdev
;
4652 unsigned long long new;
4655 err
= kstrtoull(buf
, 10, &new);
4658 if (new != (sector_t
)new)
4660 err
= mddev_lock(mddev
);
4666 mddev
->reshape_position
= new;
4667 mddev
->delta_disks
= 0;
4668 mddev
->reshape_backwards
= 0;
4669 mddev
->new_level
= mddev
->level
;
4670 mddev
->new_layout
= mddev
->layout
;
4671 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
4672 rdev_for_each(rdev
, mddev
)
4673 rdev
->new_data_offset
= rdev
->data_offset
;
4676 mddev_unlock(mddev
);
4680 static struct md_sysfs_entry md_reshape_position
=
4681 __ATTR(reshape_position
, S_IRUGO
|S_IWUSR
, reshape_position_show
,
4682 reshape_position_store
);
4685 reshape_direction_show(struct mddev
*mddev
, char *page
)
4687 return sprintf(page
, "%s\n",
4688 mddev
->reshape_backwards
? "backwards" : "forwards");
4692 reshape_direction_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4697 if (cmd_match(buf
, "forwards"))
4699 else if (cmd_match(buf
, "backwards"))
4703 if (mddev
->reshape_backwards
== backwards
)
4706 err
= mddev_lock(mddev
);
4709 /* check if we are allowed to change */
4710 if (mddev
->delta_disks
)
4712 else if (mddev
->persistent
&&
4713 mddev
->major_version
== 0)
4716 mddev
->reshape_backwards
= backwards
;
4717 mddev_unlock(mddev
);
4721 static struct md_sysfs_entry md_reshape_direction
=
4722 __ATTR(reshape_direction
, S_IRUGO
|S_IWUSR
, reshape_direction_show
,
4723 reshape_direction_store
);
4726 array_size_show(struct mddev
*mddev
, char *page
)
4728 if (mddev
->external_size
)
4729 return sprintf(page
, "%llu\n",
4730 (unsigned long long)mddev
->array_sectors
/2);
4732 return sprintf(page
, "default\n");
4736 array_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4741 err
= mddev_lock(mddev
);
4745 if (strncmp(buf
, "default", 7) == 0) {
4747 sectors
= mddev
->pers
->size(mddev
, 0, 0);
4749 sectors
= mddev
->array_sectors
;
4751 mddev
->external_size
= 0;
4753 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
4755 else if (mddev
->pers
&& mddev
->pers
->size(mddev
, 0, 0) < sectors
)
4758 mddev
->external_size
= 1;
4762 mddev
->array_sectors
= sectors
;
4764 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
4765 revalidate_disk(mddev
->gendisk
);
4768 mddev_unlock(mddev
);
4772 static struct md_sysfs_entry md_array_size
=
4773 __ATTR(array_size
, S_IRUGO
|S_IWUSR
, array_size_show
,
4776 static struct attribute
*md_default_attrs
[] = {
4779 &md_raid_disks
.attr
,
4780 &md_chunk_size
.attr
,
4782 &md_resync_start
.attr
,
4784 &md_new_device
.attr
,
4785 &md_safe_delay
.attr
,
4786 &md_array_state
.attr
,
4787 &md_reshape_position
.attr
,
4788 &md_reshape_direction
.attr
,
4789 &md_array_size
.attr
,
4790 &max_corr_read_errors
.attr
,
4794 static struct attribute
*md_redundancy_attrs
[] = {
4796 &md_last_scan_mode
.attr
,
4797 &md_mismatches
.attr
,
4800 &md_sync_speed
.attr
,
4801 &md_sync_force_parallel
.attr
,
4802 &md_sync_completed
.attr
,
4805 &md_suspend_lo
.attr
,
4806 &md_suspend_hi
.attr
,
4811 static struct attribute_group md_redundancy_group
= {
4813 .attrs
= md_redundancy_attrs
,
4817 md_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
4819 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4820 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
4825 spin_lock(&all_mddevs_lock
);
4826 if (list_empty(&mddev
->all_mddevs
)) {
4827 spin_unlock(&all_mddevs_lock
);
4831 spin_unlock(&all_mddevs_lock
);
4833 rv
= entry
->show(mddev
, page
);
4839 md_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
4840 const char *page
, size_t length
)
4842 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4843 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
4848 if (!capable(CAP_SYS_ADMIN
))
4850 spin_lock(&all_mddevs_lock
);
4851 if (list_empty(&mddev
->all_mddevs
)) {
4852 spin_unlock(&all_mddevs_lock
);
4856 spin_unlock(&all_mddevs_lock
);
4857 rv
= entry
->store(mddev
, page
, length
);
4862 static void md_free(struct kobject
*ko
)
4864 struct mddev
*mddev
= container_of(ko
, struct mddev
, kobj
);
4866 if (mddev
->sysfs_state
)
4867 sysfs_put(mddev
->sysfs_state
);
4870 blk_cleanup_queue(mddev
->queue
);
4871 if (mddev
->gendisk
) {
4872 del_gendisk(mddev
->gendisk
);
4873 put_disk(mddev
->gendisk
);
4879 static const struct sysfs_ops md_sysfs_ops
= {
4880 .show
= md_attr_show
,
4881 .store
= md_attr_store
,
4883 static struct kobj_type md_ktype
= {
4885 .sysfs_ops
= &md_sysfs_ops
,
4886 .default_attrs
= md_default_attrs
,
4891 static void mddev_delayed_delete(struct work_struct
*ws
)
4893 struct mddev
*mddev
= container_of(ws
, struct mddev
, del_work
);
4895 sysfs_remove_group(&mddev
->kobj
, &md_bitmap_group
);
4896 kobject_del(&mddev
->kobj
);
4897 kobject_put(&mddev
->kobj
);
4900 static int md_alloc(dev_t dev
, char *name
)
4902 static DEFINE_MUTEX(disks_mutex
);
4903 struct mddev
*mddev
= mddev_find(dev
);
4904 struct gendisk
*disk
;
4913 partitioned
= (MAJOR(mddev
->unit
) != MD_MAJOR
);
4914 shift
= partitioned
? MdpMinorShift
: 0;
4915 unit
= MINOR(mddev
->unit
) >> shift
;
4917 /* wait for any previous instance of this device to be
4918 * completely removed (mddev_delayed_delete).
4920 flush_workqueue(md_misc_wq
);
4922 mutex_lock(&disks_mutex
);
4928 /* Need to ensure that 'name' is not a duplicate.
4930 struct mddev
*mddev2
;
4931 spin_lock(&all_mddevs_lock
);
4933 list_for_each_entry(mddev2
, &all_mddevs
, all_mddevs
)
4934 if (mddev2
->gendisk
&&
4935 strcmp(mddev2
->gendisk
->disk_name
, name
) == 0) {
4936 spin_unlock(&all_mddevs_lock
);
4939 spin_unlock(&all_mddevs_lock
);
4943 mddev
->queue
= blk_alloc_queue(GFP_KERNEL
);
4946 mddev
->queue
->queuedata
= mddev
;
4948 blk_queue_make_request(mddev
->queue
, md_make_request
);
4949 blk_set_stacking_limits(&mddev
->queue
->limits
);
4951 disk
= alloc_disk(1 << shift
);
4953 blk_cleanup_queue(mddev
->queue
);
4954 mddev
->queue
= NULL
;
4957 disk
->major
= MAJOR(mddev
->unit
);
4958 disk
->first_minor
= unit
<< shift
;
4960 strcpy(disk
->disk_name
, name
);
4961 else if (partitioned
)
4962 sprintf(disk
->disk_name
, "md_d%d", unit
);
4964 sprintf(disk
->disk_name
, "md%d", unit
);
4965 disk
->fops
= &md_fops
;
4966 disk
->private_data
= mddev
;
4967 disk
->queue
= mddev
->queue
;
4968 blk_queue_flush(mddev
->queue
, REQ_FLUSH
| REQ_FUA
);
4969 /* Allow extended partitions. This makes the
4970 * 'mdp' device redundant, but we can't really
4973 disk
->flags
|= GENHD_FL_EXT_DEVT
;
4974 mddev
->gendisk
= disk
;
4975 /* As soon as we call add_disk(), another thread could get
4976 * through to md_open, so make sure it doesn't get too far
4978 mutex_lock(&mddev
->open_mutex
);
4981 error
= kobject_init_and_add(&mddev
->kobj
, &md_ktype
,
4982 &disk_to_dev(disk
)->kobj
, "%s", "md");
4984 /* This isn't possible, but as kobject_init_and_add is marked
4985 * __must_check, we must do something with the result
4987 printk(KERN_WARNING
"md: cannot register %s/md - name in use\n",
4991 if (mddev
->kobj
.sd
&&
4992 sysfs_create_group(&mddev
->kobj
, &md_bitmap_group
))
4993 printk(KERN_DEBUG
"pointless warning\n");
4994 mutex_unlock(&mddev
->open_mutex
);
4996 mutex_unlock(&disks_mutex
);
4997 if (!error
&& mddev
->kobj
.sd
) {
4998 kobject_uevent(&mddev
->kobj
, KOBJ_ADD
);
4999 mddev
->sysfs_state
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "array_state");
5005 static struct kobject
*md_probe(dev_t dev
, int *part
, void *data
)
5007 md_alloc(dev
, NULL
);
5011 static int add_named_array(const char *val
, struct kernel_param
*kp
)
5013 /* val must be "md_*" where * is not all digits.
5014 * We allocate an array with a large free minor number, and
5015 * set the name to val. val must not already be an active name.
5017 int len
= strlen(val
);
5018 char buf
[DISK_NAME_LEN
];
5020 while (len
&& val
[len
-1] == '\n')
5022 if (len
>= DISK_NAME_LEN
)
5024 strlcpy(buf
, val
, len
+1);
5025 if (strncmp(buf
, "md_", 3) != 0)
5027 return md_alloc(0, buf
);
5030 static void md_safemode_timeout(unsigned long data
)
5032 struct mddev
*mddev
= (struct mddev
*) data
;
5034 if (!atomic_read(&mddev
->writes_pending
)) {
5035 mddev
->safemode
= 1;
5036 if (mddev
->external
)
5037 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5039 md_wakeup_thread(mddev
->thread
);
5042 static int start_dirty_degraded
;
5044 int md_run(struct mddev
*mddev
)
5047 struct md_rdev
*rdev
;
5048 struct md_personality
*pers
;
5050 if (list_empty(&mddev
->disks
))
5051 /* cannot run an array with no devices.. */
5056 /* Cannot run until previous stop completes properly */
5057 if (mddev
->sysfs_active
)
5061 * Analyze all RAID superblock(s)
5063 if (!mddev
->raid_disks
) {
5064 if (!mddev
->persistent
)
5069 if (mddev
->level
!= LEVEL_NONE
)
5070 request_module("md-level-%d", mddev
->level
);
5071 else if (mddev
->clevel
[0])
5072 request_module("md-%s", mddev
->clevel
);
5075 * Drop all container device buffers, from now on
5076 * the only valid external interface is through the md
5079 rdev_for_each(rdev
, mddev
) {
5080 if (test_bit(Faulty
, &rdev
->flags
))
5082 sync_blockdev(rdev
->bdev
);
5083 invalidate_bdev(rdev
->bdev
);
5085 /* perform some consistency tests on the device.
5086 * We don't want the data to overlap the metadata,
5087 * Internal Bitmap issues have been handled elsewhere.
5089 if (rdev
->meta_bdev
) {
5090 /* Nothing to check */;
5091 } else if (rdev
->data_offset
< rdev
->sb_start
) {
5092 if (mddev
->dev_sectors
&&
5093 rdev
->data_offset
+ mddev
->dev_sectors
5095 printk("md: %s: data overlaps metadata\n",
5100 if (rdev
->sb_start
+ rdev
->sb_size
/512
5101 > rdev
->data_offset
) {
5102 printk("md: %s: metadata overlaps data\n",
5107 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
5110 if (mddev
->bio_set
== NULL
)
5111 mddev
->bio_set
= bioset_create(BIO_POOL_SIZE
, 0);
5113 spin_lock(&pers_lock
);
5114 pers
= find_pers(mddev
->level
, mddev
->clevel
);
5115 if (!pers
|| !try_module_get(pers
->owner
)) {
5116 spin_unlock(&pers_lock
);
5117 if (mddev
->level
!= LEVEL_NONE
)
5118 printk(KERN_WARNING
"md: personality for level %d is not loaded!\n",
5121 printk(KERN_WARNING
"md: personality for level %s is not loaded!\n",
5125 spin_unlock(&pers_lock
);
5126 if (mddev
->level
!= pers
->level
) {
5127 mddev
->level
= pers
->level
;
5128 mddev
->new_level
= pers
->level
;
5130 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
5132 if (mddev
->reshape_position
!= MaxSector
&&
5133 pers
->start_reshape
== NULL
) {
5134 /* This personality cannot handle reshaping... */
5135 module_put(pers
->owner
);
5139 if (pers
->sync_request
) {
5140 /* Warn if this is a potentially silly
5143 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
5144 struct md_rdev
*rdev2
;
5147 rdev_for_each(rdev
, mddev
)
5148 rdev_for_each(rdev2
, mddev
) {
5150 rdev
->bdev
->bd_contains
==
5151 rdev2
->bdev
->bd_contains
) {
5153 "%s: WARNING: %s appears to be"
5154 " on the same physical disk as"
5157 bdevname(rdev
->bdev
,b
),
5158 bdevname(rdev2
->bdev
,b2
));
5165 "True protection against single-disk"
5166 " failure might be compromised.\n");
5169 mddev
->recovery
= 0;
5170 /* may be over-ridden by personality */
5171 mddev
->resync_max_sectors
= mddev
->dev_sectors
;
5173 mddev
->ok_start_degraded
= start_dirty_degraded
;
5175 if (start_readonly
&& mddev
->ro
== 0)
5176 mddev
->ro
= 2; /* read-only, but switch on first write */
5178 err
= pers
->run(mddev
);
5180 printk(KERN_ERR
"md: pers->run() failed ...\n");
5181 else if (pers
->size(mddev
, 0, 0) < mddev
->array_sectors
) {
5182 WARN_ONCE(!mddev
->external_size
, "%s: default size too small,"
5183 " but 'external_size' not in effect?\n", __func__
);
5185 "md: invalid array_size %llu > default size %llu\n",
5186 (unsigned long long)mddev
->array_sectors
/ 2,
5187 (unsigned long long)pers
->size(mddev
, 0, 0) / 2);
5190 if (err
== 0 && pers
->sync_request
&&
5191 (mddev
->bitmap_info
.file
|| mddev
->bitmap_info
.offset
)) {
5192 struct bitmap
*bitmap
;
5194 bitmap
= bitmap_create(mddev
, -1);
5195 if (IS_ERR(bitmap
)) {
5196 err
= PTR_ERR(bitmap
);
5197 printk(KERN_ERR
"%s: failed to create bitmap (%d)\n",
5198 mdname(mddev
), err
);
5200 mddev
->bitmap
= bitmap
;
5204 mddev_detach(mddev
);
5206 pers
->free(mddev
, mddev
->private);
5207 mddev
->private = NULL
;
5208 module_put(pers
->owner
);
5209 bitmap_destroy(mddev
);
5213 mddev
->queue
->backing_dev_info
.congested_data
= mddev
;
5214 mddev
->queue
->backing_dev_info
.congested_fn
= md_congested
;
5216 if (pers
->sync_request
) {
5217 if (mddev
->kobj
.sd
&&
5218 sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
5220 "md: cannot register extra attributes for %s\n",
5222 mddev
->sysfs_action
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "sync_action");
5223 } else if (mddev
->ro
== 2) /* auto-readonly not meaningful */
5226 atomic_set(&mddev
->writes_pending
,0);
5227 atomic_set(&mddev
->max_corr_read_errors
,
5228 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS
);
5229 mddev
->safemode
= 0;
5230 mddev
->safemode_delay
= (200 * HZ
)/1000 +1; /* 200 msec delay */
5233 spin_lock(&mddev
->lock
);
5236 spin_unlock(&mddev
->lock
);
5237 rdev_for_each(rdev
, mddev
)
5238 if (rdev
->raid_disk
>= 0)
5239 if (sysfs_link_rdev(mddev
, rdev
))
5240 /* failure here is OK */;
5242 if (mddev
->degraded
&& !mddev
->ro
)
5243 /* This ensures that recovering status is reported immediately
5244 * via sysfs - until a lack of spares is confirmed.
5246 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
5247 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5249 if (mddev
->flags
& MD_UPDATE_SB_FLAGS
)
5250 md_update_sb(mddev
, 0);
5252 md_new_event(mddev
);
5253 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5254 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
5255 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
5258 EXPORT_SYMBOL_GPL(md_run
);
5260 static int do_md_run(struct mddev
*mddev
)
5264 err
= md_run(mddev
);
5267 err
= bitmap_load(mddev
);
5269 bitmap_destroy(mddev
);
5273 md_wakeup_thread(mddev
->thread
);
5274 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
5276 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
5277 revalidate_disk(mddev
->gendisk
);
5279 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
5284 static int restart_array(struct mddev
*mddev
)
5286 struct gendisk
*disk
= mddev
->gendisk
;
5288 /* Complain if it has no devices */
5289 if (list_empty(&mddev
->disks
))
5295 mddev
->safemode
= 0;
5297 set_disk_ro(disk
, 0);
5298 printk(KERN_INFO
"md: %s switched to read-write mode.\n",
5300 /* Kick recovery or resync if necessary */
5301 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5302 md_wakeup_thread(mddev
->thread
);
5303 md_wakeup_thread(mddev
->sync_thread
);
5304 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5308 static void md_clean(struct mddev
*mddev
)
5310 mddev
->array_sectors
= 0;
5311 mddev
->external_size
= 0;
5312 mddev
->dev_sectors
= 0;
5313 mddev
->raid_disks
= 0;
5314 mddev
->recovery_cp
= 0;
5315 mddev
->resync_min
= 0;
5316 mddev
->resync_max
= MaxSector
;
5317 mddev
->reshape_position
= MaxSector
;
5318 mddev
->external
= 0;
5319 mddev
->persistent
= 0;
5320 mddev
->level
= LEVEL_NONE
;
5321 mddev
->clevel
[0] = 0;
5324 mddev
->metadata_type
[0] = 0;
5325 mddev
->chunk_sectors
= 0;
5326 mddev
->ctime
= mddev
->utime
= 0;
5328 mddev
->max_disks
= 0;
5330 mddev
->can_decrease_events
= 0;
5331 mddev
->delta_disks
= 0;
5332 mddev
->reshape_backwards
= 0;
5333 mddev
->new_level
= LEVEL_NONE
;
5334 mddev
->new_layout
= 0;
5335 mddev
->new_chunk_sectors
= 0;
5336 mddev
->curr_resync
= 0;
5337 atomic64_set(&mddev
->resync_mismatches
, 0);
5338 mddev
->suspend_lo
= mddev
->suspend_hi
= 0;
5339 mddev
->sync_speed_min
= mddev
->sync_speed_max
= 0;
5340 mddev
->recovery
= 0;
5343 mddev
->degraded
= 0;
5344 mddev
->safemode
= 0;
5345 mddev
->private = NULL
;
5346 mddev
->bitmap_info
.offset
= 0;
5347 mddev
->bitmap_info
.default_offset
= 0;
5348 mddev
->bitmap_info
.default_space
= 0;
5349 mddev
->bitmap_info
.chunksize
= 0;
5350 mddev
->bitmap_info
.daemon_sleep
= 0;
5351 mddev
->bitmap_info
.max_write_behind
= 0;
5354 static void __md_stop_writes(struct mddev
*mddev
)
5356 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5357 flush_workqueue(md_misc_wq
);
5358 if (mddev
->sync_thread
) {
5359 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5360 md_reap_sync_thread(mddev
);
5363 del_timer_sync(&mddev
->safemode_timer
);
5365 bitmap_flush(mddev
);
5366 md_super_wait(mddev
);
5368 if (mddev
->ro
== 0 &&
5369 (!mddev
->in_sync
|| (mddev
->flags
& MD_UPDATE_SB_FLAGS
))) {
5370 /* mark array as shutdown cleanly */
5372 md_update_sb(mddev
, 1);
5376 void md_stop_writes(struct mddev
*mddev
)
5378 mddev_lock_nointr(mddev
);
5379 __md_stop_writes(mddev
);
5380 mddev_unlock(mddev
);
5382 EXPORT_SYMBOL_GPL(md_stop_writes
);
5384 static void mddev_detach(struct mddev
*mddev
)
5386 struct bitmap
*bitmap
= mddev
->bitmap
;
5387 /* wait for behind writes to complete */
5388 if (bitmap
&& atomic_read(&bitmap
->behind_writes
) > 0) {
5389 printk(KERN_INFO
"md:%s: behind writes in progress - waiting to stop.\n",
5391 /* need to kick something here to make sure I/O goes? */
5392 wait_event(bitmap
->behind_wait
,
5393 atomic_read(&bitmap
->behind_writes
) == 0);
5395 if (mddev
->pers
&& mddev
->pers
->quiesce
) {
5396 mddev
->pers
->quiesce(mddev
, 1);
5397 mddev
->pers
->quiesce(mddev
, 0);
5399 md_unregister_thread(&mddev
->thread
);
5401 blk_sync_queue(mddev
->queue
); /* the unplug fn references 'conf'*/
5404 static void __md_stop(struct mddev
*mddev
)
5406 struct md_personality
*pers
= mddev
->pers
;
5407 mddev_detach(mddev
);
5408 /* Ensure ->event_work is done */
5409 flush_workqueue(md_misc_wq
);
5410 spin_lock(&mddev
->lock
);
5413 spin_unlock(&mddev
->lock
);
5414 pers
->free(mddev
, mddev
->private);
5415 mddev
->private = NULL
;
5416 if (pers
->sync_request
&& mddev
->to_remove
== NULL
)
5417 mddev
->to_remove
= &md_redundancy_group
;
5418 module_put(pers
->owner
);
5419 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5422 void md_stop(struct mddev
*mddev
)
5424 /* stop the array and free an attached data structures.
5425 * This is called from dm-raid
5428 bitmap_destroy(mddev
);
5430 bioset_free(mddev
->bio_set
);
5433 EXPORT_SYMBOL_GPL(md_stop
);
5435 static int md_set_readonly(struct mddev
*mddev
, struct block_device
*bdev
)
5440 if (!test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
)) {
5442 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5443 md_wakeup_thread(mddev
->thread
);
5445 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
5446 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5447 if (mddev
->sync_thread
)
5448 /* Thread might be blocked waiting for metadata update
5449 * which will now never happen */
5450 wake_up_process(mddev
->sync_thread
->tsk
);
5452 if (mddev
->external
&& test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
5454 mddev_unlock(mddev
);
5455 wait_event(resync_wait
, !test_bit(MD_RECOVERY_RUNNING
,
5457 wait_event(mddev
->sb_wait
,
5458 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
5459 mddev_lock_nointr(mddev
);
5461 mutex_lock(&mddev
->open_mutex
);
5462 if ((mddev
->pers
&& atomic_read(&mddev
->openers
) > !!bdev
) ||
5463 mddev
->sync_thread
||
5464 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
5465 (bdev
&& !test_bit(MD_STILL_CLOSED
, &mddev
->flags
))) {
5466 printk("md: %s still in use.\n",mdname(mddev
));
5468 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5469 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5470 md_wakeup_thread(mddev
->thread
);
5476 __md_stop_writes(mddev
);
5482 set_disk_ro(mddev
->gendisk
, 1);
5483 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5484 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5485 md_wakeup_thread(mddev
->thread
);
5486 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5490 mutex_unlock(&mddev
->open_mutex
);
5495 * 0 - completely stop and dis-assemble array
5496 * 2 - stop but do not disassemble array
5498 static int do_md_stop(struct mddev
*mddev
, int mode
,
5499 struct block_device
*bdev
)
5501 struct gendisk
*disk
= mddev
->gendisk
;
5502 struct md_rdev
*rdev
;
5505 if (!test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
)) {
5507 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5508 md_wakeup_thread(mddev
->thread
);
5510 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
5511 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5512 if (mddev
->sync_thread
)
5513 /* Thread might be blocked waiting for metadata update
5514 * which will now never happen */
5515 wake_up_process(mddev
->sync_thread
->tsk
);
5517 mddev_unlock(mddev
);
5518 wait_event(resync_wait
, (mddev
->sync_thread
== NULL
&&
5519 !test_bit(MD_RECOVERY_RUNNING
,
5520 &mddev
->recovery
)));
5521 mddev_lock_nointr(mddev
);
5523 mutex_lock(&mddev
->open_mutex
);
5524 if ((mddev
->pers
&& atomic_read(&mddev
->openers
) > !!bdev
) ||
5525 mddev
->sysfs_active
||
5526 mddev
->sync_thread
||
5527 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
5528 (bdev
&& !test_bit(MD_STILL_CLOSED
, &mddev
->flags
))) {
5529 printk("md: %s still in use.\n",mdname(mddev
));
5530 mutex_unlock(&mddev
->open_mutex
);
5532 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5533 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5534 md_wakeup_thread(mddev
->thread
);
5540 set_disk_ro(disk
, 0);
5542 __md_stop_writes(mddev
);
5544 mddev
->queue
->backing_dev_info
.congested_fn
= NULL
;
5546 /* tell userspace to handle 'inactive' */
5547 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5549 rdev_for_each(rdev
, mddev
)
5550 if (rdev
->raid_disk
>= 0)
5551 sysfs_unlink_rdev(mddev
, rdev
);
5553 set_capacity(disk
, 0);
5554 mutex_unlock(&mddev
->open_mutex
);
5556 revalidate_disk(disk
);
5561 mutex_unlock(&mddev
->open_mutex
);
5563 * Free resources if final stop
5566 printk(KERN_INFO
"md: %s stopped.\n", mdname(mddev
));
5568 bitmap_destroy(mddev
);
5569 if (mddev
->bitmap_info
.file
) {
5570 struct file
*f
= mddev
->bitmap_info
.file
;
5571 spin_lock(&mddev
->lock
);
5572 mddev
->bitmap_info
.file
= NULL
;
5573 spin_unlock(&mddev
->lock
);
5576 mddev
->bitmap_info
.offset
= 0;
5578 export_array(mddev
);
5581 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
5582 if (mddev
->hold_active
== UNTIL_STOP
)
5583 mddev
->hold_active
= 0;
5585 blk_integrity_unregister(disk
);
5586 md_new_event(mddev
);
5587 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5592 static void autorun_array(struct mddev
*mddev
)
5594 struct md_rdev
*rdev
;
5597 if (list_empty(&mddev
->disks
))
5600 printk(KERN_INFO
"md: running: ");
5602 rdev_for_each(rdev
, mddev
) {
5603 char b
[BDEVNAME_SIZE
];
5604 printk("<%s>", bdevname(rdev
->bdev
,b
));
5608 err
= do_md_run(mddev
);
5610 printk(KERN_WARNING
"md: do_md_run() returned %d\n", err
);
5611 do_md_stop(mddev
, 0, NULL
);
5616 * lets try to run arrays based on all disks that have arrived
5617 * until now. (those are in pending_raid_disks)
5619 * the method: pick the first pending disk, collect all disks with
5620 * the same UUID, remove all from the pending list and put them into
5621 * the 'same_array' list. Then order this list based on superblock
5622 * update time (freshest comes first), kick out 'old' disks and
5623 * compare superblocks. If everything's fine then run it.
5625 * If "unit" is allocated, then bump its reference count
5627 static void autorun_devices(int part
)
5629 struct md_rdev
*rdev0
, *rdev
, *tmp
;
5630 struct mddev
*mddev
;
5631 char b
[BDEVNAME_SIZE
];
5633 printk(KERN_INFO
"md: autorun ...\n");
5634 while (!list_empty(&pending_raid_disks
)) {
5637 LIST_HEAD(candidates
);
5638 rdev0
= list_entry(pending_raid_disks
.next
,
5639 struct md_rdev
, same_set
);
5641 printk(KERN_INFO
"md: considering %s ...\n",
5642 bdevname(rdev0
->bdev
,b
));
5643 INIT_LIST_HEAD(&candidates
);
5644 rdev_for_each_list(rdev
, tmp
, &pending_raid_disks
)
5645 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
5646 printk(KERN_INFO
"md: adding %s ...\n",
5647 bdevname(rdev
->bdev
,b
));
5648 list_move(&rdev
->same_set
, &candidates
);
5651 * now we have a set of devices, with all of them having
5652 * mostly sane superblocks. It's time to allocate the
5656 dev
= MKDEV(mdp_major
,
5657 rdev0
->preferred_minor
<< MdpMinorShift
);
5658 unit
= MINOR(dev
) >> MdpMinorShift
;
5660 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
5663 if (rdev0
->preferred_minor
!= unit
) {
5664 printk(KERN_INFO
"md: unit number in %s is bad: %d\n",
5665 bdevname(rdev0
->bdev
, b
), rdev0
->preferred_minor
);
5669 md_probe(dev
, NULL
, NULL
);
5670 mddev
= mddev_find(dev
);
5671 if (!mddev
|| !mddev
->gendisk
) {
5675 "md: cannot allocate memory for md drive.\n");
5678 if (mddev_lock(mddev
))
5679 printk(KERN_WARNING
"md: %s locked, cannot run\n",
5681 else if (mddev
->raid_disks
|| mddev
->major_version
5682 || !list_empty(&mddev
->disks
)) {
5684 "md: %s already running, cannot run %s\n",
5685 mdname(mddev
), bdevname(rdev0
->bdev
,b
));
5686 mddev_unlock(mddev
);
5688 printk(KERN_INFO
"md: created %s\n", mdname(mddev
));
5689 mddev
->persistent
= 1;
5690 rdev_for_each_list(rdev
, tmp
, &candidates
) {
5691 list_del_init(&rdev
->same_set
);
5692 if (bind_rdev_to_array(rdev
, mddev
))
5695 autorun_array(mddev
);
5696 mddev_unlock(mddev
);
5698 /* on success, candidates will be empty, on error
5701 rdev_for_each_list(rdev
, tmp
, &candidates
) {
5702 list_del_init(&rdev
->same_set
);
5707 printk(KERN_INFO
"md: ... autorun DONE.\n");
5709 #endif /* !MODULE */
5711 static int get_version(void __user
*arg
)
5715 ver
.major
= MD_MAJOR_VERSION
;
5716 ver
.minor
= MD_MINOR_VERSION
;
5717 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
5719 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
5725 static int get_array_info(struct mddev
*mddev
, void __user
*arg
)
5727 mdu_array_info_t info
;
5728 int nr
,working
,insync
,failed
,spare
;
5729 struct md_rdev
*rdev
;
5731 nr
= working
= insync
= failed
= spare
= 0;
5733 rdev_for_each_rcu(rdev
, mddev
) {
5735 if (test_bit(Faulty
, &rdev
->flags
))
5739 if (test_bit(In_sync
, &rdev
->flags
))
5747 info
.major_version
= mddev
->major_version
;
5748 info
.minor_version
= mddev
->minor_version
;
5749 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
5750 info
.ctime
= mddev
->ctime
;
5751 info
.level
= mddev
->level
;
5752 info
.size
= mddev
->dev_sectors
/ 2;
5753 if (info
.size
!= mddev
->dev_sectors
/ 2) /* overflow */
5756 info
.raid_disks
= mddev
->raid_disks
;
5757 info
.md_minor
= mddev
->md_minor
;
5758 info
.not_persistent
= !mddev
->persistent
;
5760 info
.utime
= mddev
->utime
;
5763 info
.state
= (1<<MD_SB_CLEAN
);
5764 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
5765 info
.state
|= (1<<MD_SB_BITMAP_PRESENT
);
5766 if (mddev_is_clustered(mddev
))
5767 info
.state
|= (1<<MD_SB_CLUSTERED
);
5768 info
.active_disks
= insync
;
5769 info
.working_disks
= working
;
5770 info
.failed_disks
= failed
;
5771 info
.spare_disks
= spare
;
5773 info
.layout
= mddev
->layout
;
5774 info
.chunk_size
= mddev
->chunk_sectors
<< 9;
5776 if (copy_to_user(arg
, &info
, sizeof(info
)))
5782 static int get_bitmap_file(struct mddev
*mddev
, void __user
* arg
)
5784 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
5788 file
= kzalloc(sizeof(*file
), GFP_NOIO
);
5793 spin_lock(&mddev
->lock
);
5794 /* bitmap enabled */
5795 if (mddev
->bitmap_info
.file
) {
5796 ptr
= file_path(mddev
->bitmap_info
.file
, file
->pathname
,
5797 sizeof(file
->pathname
));
5801 memmove(file
->pathname
, ptr
,
5802 sizeof(file
->pathname
)-(ptr
-file
->pathname
));
5804 spin_unlock(&mddev
->lock
);
5807 copy_to_user(arg
, file
, sizeof(*file
)))
5814 static int get_disk_info(struct mddev
*mddev
, void __user
* arg
)
5816 mdu_disk_info_t info
;
5817 struct md_rdev
*rdev
;
5819 if (copy_from_user(&info
, arg
, sizeof(info
)))
5823 rdev
= md_find_rdev_nr_rcu(mddev
, info
.number
);
5825 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
5826 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
5827 info
.raid_disk
= rdev
->raid_disk
;
5829 if (test_bit(Faulty
, &rdev
->flags
))
5830 info
.state
|= (1<<MD_DISK_FAULTY
);
5831 else if (test_bit(In_sync
, &rdev
->flags
)) {
5832 info
.state
|= (1<<MD_DISK_ACTIVE
);
5833 info
.state
|= (1<<MD_DISK_SYNC
);
5835 if (test_bit(WriteMostly
, &rdev
->flags
))
5836 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
5838 info
.major
= info
.minor
= 0;
5839 info
.raid_disk
= -1;
5840 info
.state
= (1<<MD_DISK_REMOVED
);
5844 if (copy_to_user(arg
, &info
, sizeof(info
)))
5850 static int add_new_disk(struct mddev
*mddev
, mdu_disk_info_t
*info
)
5852 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
5853 struct md_rdev
*rdev
;
5854 dev_t dev
= MKDEV(info
->major
,info
->minor
);
5856 if (mddev_is_clustered(mddev
) &&
5857 !(info
->state
& ((1 << MD_DISK_CLUSTER_ADD
) | (1 << MD_DISK_CANDIDATE
)))) {
5858 pr_err("%s: Cannot add to clustered mddev.\n",
5863 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
5866 if (!mddev
->raid_disks
) {
5868 /* expecting a device which has a superblock */
5869 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
5872 "md: md_import_device returned %ld\n",
5874 return PTR_ERR(rdev
);
5876 if (!list_empty(&mddev
->disks
)) {
5877 struct md_rdev
*rdev0
5878 = list_entry(mddev
->disks
.next
,
5879 struct md_rdev
, same_set
);
5880 err
= super_types
[mddev
->major_version
]
5881 .load_super(rdev
, rdev0
, mddev
->minor_version
);
5884 "md: %s has different UUID to %s\n",
5885 bdevname(rdev
->bdev
,b
),
5886 bdevname(rdev0
->bdev
,b2
));
5891 err
= bind_rdev_to_array(rdev
, mddev
);
5898 * add_new_disk can be used once the array is assembled
5899 * to add "hot spares". They must already have a superblock
5904 if (!mddev
->pers
->hot_add_disk
) {
5906 "%s: personality does not support diskops!\n",
5910 if (mddev
->persistent
)
5911 rdev
= md_import_device(dev
, mddev
->major_version
,
5912 mddev
->minor_version
);
5914 rdev
= md_import_device(dev
, -1, -1);
5917 "md: md_import_device returned %ld\n",
5919 return PTR_ERR(rdev
);
5921 /* set saved_raid_disk if appropriate */
5922 if (!mddev
->persistent
) {
5923 if (info
->state
& (1<<MD_DISK_SYNC
) &&
5924 info
->raid_disk
< mddev
->raid_disks
) {
5925 rdev
->raid_disk
= info
->raid_disk
;
5926 set_bit(In_sync
, &rdev
->flags
);
5927 clear_bit(Bitmap_sync
, &rdev
->flags
);
5929 rdev
->raid_disk
= -1;
5930 rdev
->saved_raid_disk
= rdev
->raid_disk
;
5932 super_types
[mddev
->major_version
].
5933 validate_super(mddev
, rdev
);
5934 if ((info
->state
& (1<<MD_DISK_SYNC
)) &&
5935 rdev
->raid_disk
!= info
->raid_disk
) {
5936 /* This was a hot-add request, but events doesn't
5937 * match, so reject it.
5943 clear_bit(In_sync
, &rdev
->flags
); /* just to be sure */
5944 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
5945 set_bit(WriteMostly
, &rdev
->flags
);
5947 clear_bit(WriteMostly
, &rdev
->flags
);
5950 * check whether the device shows up in other nodes
5952 if (mddev_is_clustered(mddev
)) {
5953 if (info
->state
& (1 << MD_DISK_CANDIDATE
)) {
5954 /* Through --cluster-confirm */
5955 set_bit(Candidate
, &rdev
->flags
);
5956 err
= md_cluster_ops
->new_disk_ack(mddev
, true);
5961 } else if (info
->state
& (1 << MD_DISK_CLUSTER_ADD
)) {
5962 /* --add initiated by this node */
5963 err
= md_cluster_ops
->add_new_disk_start(mddev
, rdev
);
5965 md_cluster_ops
->add_new_disk_finish(mddev
);
5972 rdev
->raid_disk
= -1;
5973 err
= bind_rdev_to_array(rdev
, mddev
);
5977 err
= add_bound_rdev(rdev
);
5978 if (mddev_is_clustered(mddev
) &&
5979 (info
->state
& (1 << MD_DISK_CLUSTER_ADD
)))
5980 md_cluster_ops
->add_new_disk_finish(mddev
);
5984 /* otherwise, add_new_disk is only allowed
5985 * for major_version==0 superblocks
5987 if (mddev
->major_version
!= 0) {
5988 printk(KERN_WARNING
"%s: ADD_NEW_DISK not supported\n",
5993 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
5995 rdev
= md_import_device(dev
, -1, 0);
5998 "md: error, md_import_device() returned %ld\n",
6000 return PTR_ERR(rdev
);
6002 rdev
->desc_nr
= info
->number
;
6003 if (info
->raid_disk
< mddev
->raid_disks
)
6004 rdev
->raid_disk
= info
->raid_disk
;
6006 rdev
->raid_disk
= -1;
6008 if (rdev
->raid_disk
< mddev
->raid_disks
)
6009 if (info
->state
& (1<<MD_DISK_SYNC
))
6010 set_bit(In_sync
, &rdev
->flags
);
6012 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
6013 set_bit(WriteMostly
, &rdev
->flags
);
6015 if (!mddev
->persistent
) {
6016 printk(KERN_INFO
"md: nonpersistent superblock ...\n");
6017 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
6019 rdev
->sb_start
= calc_dev_sboffset(rdev
);
6020 rdev
->sectors
= rdev
->sb_start
;
6022 err
= bind_rdev_to_array(rdev
, mddev
);
6032 static int hot_remove_disk(struct mddev
*mddev
, dev_t dev
)
6034 char b
[BDEVNAME_SIZE
];
6035 struct md_rdev
*rdev
;
6037 rdev
= find_rdev(mddev
, dev
);
6041 if (mddev_is_clustered(mddev
))
6042 md_cluster_ops
->metadata_update_start(mddev
);
6044 if (rdev
->raid_disk
< 0)
6047 clear_bit(Blocked
, &rdev
->flags
);
6048 remove_and_add_spares(mddev
, rdev
);
6050 if (rdev
->raid_disk
>= 0)
6054 if (mddev_is_clustered(mddev
))
6055 md_cluster_ops
->remove_disk(mddev
, rdev
);
6057 md_kick_rdev_from_array(rdev
);
6058 md_update_sb(mddev
, 1);
6059 md_new_event(mddev
);
6063 if (mddev_is_clustered(mddev
))
6064 md_cluster_ops
->metadata_update_cancel(mddev
);
6066 printk(KERN_WARNING
"md: cannot remove active disk %s from %s ...\n",
6067 bdevname(rdev
->bdev
,b
), mdname(mddev
));
6071 static int hot_add_disk(struct mddev
*mddev
, dev_t dev
)
6073 char b
[BDEVNAME_SIZE
];
6075 struct md_rdev
*rdev
;
6080 if (mddev
->major_version
!= 0) {
6081 printk(KERN_WARNING
"%s: HOT_ADD may only be used with"
6082 " version-0 superblocks.\n",
6086 if (!mddev
->pers
->hot_add_disk
) {
6088 "%s: personality does not support diskops!\n",
6093 rdev
= md_import_device(dev
, -1, 0);
6096 "md: error, md_import_device() returned %ld\n",
6101 if (mddev
->persistent
)
6102 rdev
->sb_start
= calc_dev_sboffset(rdev
);
6104 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
6106 rdev
->sectors
= rdev
->sb_start
;
6108 if (test_bit(Faulty
, &rdev
->flags
)) {
6110 "md: can not hot-add faulty %s disk to %s!\n",
6111 bdevname(rdev
->bdev
,b
), mdname(mddev
));
6116 clear_bit(In_sync
, &rdev
->flags
);
6118 rdev
->saved_raid_disk
= -1;
6119 err
= bind_rdev_to_array(rdev
, mddev
);
6124 * The rest should better be atomic, we can have disk failures
6125 * noticed in interrupt contexts ...
6128 rdev
->raid_disk
= -1;
6130 md_update_sb(mddev
, 1);
6132 * Kick recovery, maybe this spare has to be added to the
6133 * array immediately.
6135 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6136 md_wakeup_thread(mddev
->thread
);
6137 md_new_event(mddev
);
6145 static int set_bitmap_file(struct mddev
*mddev
, int fd
)
6150 if (!mddev
->pers
->quiesce
|| !mddev
->thread
)
6152 if (mddev
->recovery
|| mddev
->sync_thread
)
6154 /* we should be able to change the bitmap.. */
6158 struct inode
*inode
;
6161 if (mddev
->bitmap
|| mddev
->bitmap_info
.file
)
6162 return -EEXIST
; /* cannot add when bitmap is present */
6166 printk(KERN_ERR
"%s: error: failed to get bitmap file\n",
6171 inode
= f
->f_mapping
->host
;
6172 if (!S_ISREG(inode
->i_mode
)) {
6173 printk(KERN_ERR
"%s: error: bitmap file must be a regular file\n",
6176 } else if (!(f
->f_mode
& FMODE_WRITE
)) {
6177 printk(KERN_ERR
"%s: error: bitmap file must open for write\n",
6180 } else if (atomic_read(&inode
->i_writecount
) != 1) {
6181 printk(KERN_ERR
"%s: error: bitmap file is already in use\n",
6189 mddev
->bitmap_info
.file
= f
;
6190 mddev
->bitmap_info
.offset
= 0; /* file overrides offset */
6191 } else if (mddev
->bitmap
== NULL
)
6192 return -ENOENT
; /* cannot remove what isn't there */
6195 mddev
->pers
->quiesce(mddev
, 1);
6197 struct bitmap
*bitmap
;
6199 bitmap
= bitmap_create(mddev
, -1);
6200 if (!IS_ERR(bitmap
)) {
6201 mddev
->bitmap
= bitmap
;
6202 err
= bitmap_load(mddev
);
6204 err
= PTR_ERR(bitmap
);
6206 if (fd
< 0 || err
) {
6207 bitmap_destroy(mddev
);
6208 fd
= -1; /* make sure to put the file */
6210 mddev
->pers
->quiesce(mddev
, 0);
6213 struct file
*f
= mddev
->bitmap_info
.file
;
6215 spin_lock(&mddev
->lock
);
6216 mddev
->bitmap_info
.file
= NULL
;
6217 spin_unlock(&mddev
->lock
);
6226 * set_array_info is used two different ways
6227 * The original usage is when creating a new array.
6228 * In this usage, raid_disks is > 0 and it together with
6229 * level, size, not_persistent,layout,chunksize determine the
6230 * shape of the array.
6231 * This will always create an array with a type-0.90.0 superblock.
6232 * The newer usage is when assembling an array.
6233 * In this case raid_disks will be 0, and the major_version field is
6234 * use to determine which style super-blocks are to be found on the devices.
6235 * The minor and patch _version numbers are also kept incase the
6236 * super_block handler wishes to interpret them.
6238 static int set_array_info(struct mddev
*mddev
, mdu_array_info_t
*info
)
6241 if (info
->raid_disks
== 0) {
6242 /* just setting version number for superblock loading */
6243 if (info
->major_version
< 0 ||
6244 info
->major_version
>= ARRAY_SIZE(super_types
) ||
6245 super_types
[info
->major_version
].name
== NULL
) {
6246 /* maybe try to auto-load a module? */
6248 "md: superblock version %d not known\n",
6249 info
->major_version
);
6252 mddev
->major_version
= info
->major_version
;
6253 mddev
->minor_version
= info
->minor_version
;
6254 mddev
->patch_version
= info
->patch_version
;
6255 mddev
->persistent
= !info
->not_persistent
;
6256 /* ensure mddev_put doesn't delete this now that there
6257 * is some minimal configuration.
6259 mddev
->ctime
= get_seconds();
6262 mddev
->major_version
= MD_MAJOR_VERSION
;
6263 mddev
->minor_version
= MD_MINOR_VERSION
;
6264 mddev
->patch_version
= MD_PATCHLEVEL_VERSION
;
6265 mddev
->ctime
= get_seconds();
6267 mddev
->level
= info
->level
;
6268 mddev
->clevel
[0] = 0;
6269 mddev
->dev_sectors
= 2 * (sector_t
)info
->size
;
6270 mddev
->raid_disks
= info
->raid_disks
;
6271 /* don't set md_minor, it is determined by which /dev/md* was
6274 if (info
->state
& (1<<MD_SB_CLEAN
))
6275 mddev
->recovery_cp
= MaxSector
;
6277 mddev
->recovery_cp
= 0;
6278 mddev
->persistent
= ! info
->not_persistent
;
6279 mddev
->external
= 0;
6281 mddev
->layout
= info
->layout
;
6282 mddev
->chunk_sectors
= info
->chunk_size
>> 9;
6284 mddev
->max_disks
= MD_SB_DISKS
;
6286 if (mddev
->persistent
)
6288 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
6290 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
6291 mddev
->bitmap_info
.default_space
= 64*2 - (MD_SB_BYTES
>> 9);
6292 mddev
->bitmap_info
.offset
= 0;
6294 mddev
->reshape_position
= MaxSector
;
6297 * Generate a 128 bit UUID
6299 get_random_bytes(mddev
->uuid
, 16);
6301 mddev
->new_level
= mddev
->level
;
6302 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
6303 mddev
->new_layout
= mddev
->layout
;
6304 mddev
->delta_disks
= 0;
6305 mddev
->reshape_backwards
= 0;
6310 void md_set_array_sectors(struct mddev
*mddev
, sector_t array_sectors
)
6312 WARN(!mddev_is_locked(mddev
), "%s: unlocked mddev!\n", __func__
);
6314 if (mddev
->external_size
)
6317 mddev
->array_sectors
= array_sectors
;
6319 EXPORT_SYMBOL(md_set_array_sectors
);
6321 static int update_size(struct mddev
*mddev
, sector_t num_sectors
)
6323 struct md_rdev
*rdev
;
6325 int fit
= (num_sectors
== 0);
6327 if (mddev
->pers
->resize
== NULL
)
6329 /* The "num_sectors" is the number of sectors of each device that
6330 * is used. This can only make sense for arrays with redundancy.
6331 * linear and raid0 always use whatever space is available. We can only
6332 * consider changing this number if no resync or reconstruction is
6333 * happening, and if the new size is acceptable. It must fit before the
6334 * sb_start or, if that is <data_offset, it must fit before the size
6335 * of each device. If num_sectors is zero, we find the largest size
6338 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
6344 rdev_for_each(rdev
, mddev
) {
6345 sector_t avail
= rdev
->sectors
;
6347 if (fit
&& (num_sectors
== 0 || num_sectors
> avail
))
6348 num_sectors
= avail
;
6349 if (avail
< num_sectors
)
6352 rv
= mddev
->pers
->resize(mddev
, num_sectors
);
6354 revalidate_disk(mddev
->gendisk
);
6358 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
)
6361 struct md_rdev
*rdev
;
6362 /* change the number of raid disks */
6363 if (mddev
->pers
->check_reshape
== NULL
)
6367 if (raid_disks
<= 0 ||
6368 (mddev
->max_disks
&& raid_disks
>= mddev
->max_disks
))
6370 if (mddev
->sync_thread
||
6371 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
6372 mddev
->reshape_position
!= MaxSector
)
6375 rdev_for_each(rdev
, mddev
) {
6376 if (mddev
->raid_disks
< raid_disks
&&
6377 rdev
->data_offset
< rdev
->new_data_offset
)
6379 if (mddev
->raid_disks
> raid_disks
&&
6380 rdev
->data_offset
> rdev
->new_data_offset
)
6384 mddev
->delta_disks
= raid_disks
- mddev
->raid_disks
;
6385 if (mddev
->delta_disks
< 0)
6386 mddev
->reshape_backwards
= 1;
6387 else if (mddev
->delta_disks
> 0)
6388 mddev
->reshape_backwards
= 0;
6390 rv
= mddev
->pers
->check_reshape(mddev
);
6392 mddev
->delta_disks
= 0;
6393 mddev
->reshape_backwards
= 0;
6399 * update_array_info is used to change the configuration of an
6401 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
6402 * fields in the info are checked against the array.
6403 * Any differences that cannot be handled will cause an error.
6404 * Normally, only one change can be managed at a time.
6406 static int update_array_info(struct mddev
*mddev
, mdu_array_info_t
*info
)
6412 /* calculate expected state,ignoring low bits */
6413 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
6414 state
|= (1 << MD_SB_BITMAP_PRESENT
);
6416 if (mddev
->major_version
!= info
->major_version
||
6417 mddev
->minor_version
!= info
->minor_version
||
6418 /* mddev->patch_version != info->patch_version || */
6419 mddev
->ctime
!= info
->ctime
||
6420 mddev
->level
!= info
->level
||
6421 /* mddev->layout != info->layout || */
6422 mddev
->persistent
!= !info
->not_persistent
||
6423 mddev
->chunk_sectors
!= info
->chunk_size
>> 9 ||
6424 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
6425 ((state
^info
->state
) & 0xfffffe00)
6428 /* Check there is only one change */
6429 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
6431 if (mddev
->raid_disks
!= info
->raid_disks
)
6433 if (mddev
->layout
!= info
->layout
)
6435 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
))
6442 if (mddev
->layout
!= info
->layout
) {
6444 * we don't need to do anything at the md level, the
6445 * personality will take care of it all.
6447 if (mddev
->pers
->check_reshape
== NULL
)
6450 mddev
->new_layout
= info
->layout
;
6451 rv
= mddev
->pers
->check_reshape(mddev
);
6453 mddev
->new_layout
= mddev
->layout
;
6457 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
6458 rv
= update_size(mddev
, (sector_t
)info
->size
* 2);
6460 if (mddev
->raid_disks
!= info
->raid_disks
)
6461 rv
= update_raid_disks(mddev
, info
->raid_disks
);
6463 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) {
6464 if (mddev
->pers
->quiesce
== NULL
|| mddev
->thread
== NULL
) {
6468 if (mddev
->recovery
|| mddev
->sync_thread
) {
6472 if (info
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
6473 struct bitmap
*bitmap
;
6474 /* add the bitmap */
6475 if (mddev
->bitmap
) {
6479 if (mddev
->bitmap_info
.default_offset
== 0) {
6483 mddev
->bitmap_info
.offset
=
6484 mddev
->bitmap_info
.default_offset
;
6485 mddev
->bitmap_info
.space
=
6486 mddev
->bitmap_info
.default_space
;
6487 mddev
->pers
->quiesce(mddev
, 1);
6488 bitmap
= bitmap_create(mddev
, -1);
6489 if (!IS_ERR(bitmap
)) {
6490 mddev
->bitmap
= bitmap
;
6491 rv
= bitmap_load(mddev
);
6493 rv
= PTR_ERR(bitmap
);
6495 bitmap_destroy(mddev
);
6496 mddev
->pers
->quiesce(mddev
, 0);
6498 /* remove the bitmap */
6499 if (!mddev
->bitmap
) {
6503 if (mddev
->bitmap
->storage
.file
) {
6507 mddev
->pers
->quiesce(mddev
, 1);
6508 bitmap_destroy(mddev
);
6509 mddev
->pers
->quiesce(mddev
, 0);
6510 mddev
->bitmap_info
.offset
= 0;
6513 md_update_sb(mddev
, 1);
6519 static int set_disk_faulty(struct mddev
*mddev
, dev_t dev
)
6521 struct md_rdev
*rdev
;
6524 if (mddev
->pers
== NULL
)
6528 rdev
= find_rdev_rcu(mddev
, dev
);
6532 md_error(mddev
, rdev
);
6533 if (!test_bit(Faulty
, &rdev
->flags
))
6541 * We have a problem here : there is no easy way to give a CHS
6542 * virtual geometry. We currently pretend that we have a 2 heads
6543 * 4 sectors (with a BIG number of cylinders...). This drives
6544 * dosfs just mad... ;-)
6546 static int md_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
6548 struct mddev
*mddev
= bdev
->bd_disk
->private_data
;
6552 geo
->cylinders
= mddev
->array_sectors
/ 8;
6556 static inline bool md_ioctl_valid(unsigned int cmd
)
6561 case GET_ARRAY_INFO
:
6562 case GET_BITMAP_FILE
:
6565 case HOT_REMOVE_DISK
:
6568 case RESTART_ARRAY_RW
:
6570 case SET_ARRAY_INFO
:
6571 case SET_BITMAP_FILE
:
6572 case SET_DISK_FAULTY
:
6575 case CLUSTERED_DISK_NACK
:
6582 static int md_ioctl(struct block_device
*bdev
, fmode_t mode
,
6583 unsigned int cmd
, unsigned long arg
)
6586 void __user
*argp
= (void __user
*)arg
;
6587 struct mddev
*mddev
= NULL
;
6590 if (!md_ioctl_valid(cmd
))
6595 case GET_ARRAY_INFO
:
6599 if (!capable(CAP_SYS_ADMIN
))
6604 * Commands dealing with the RAID driver but not any
6609 err
= get_version(argp
);
6615 autostart_arrays(arg
);
6622 * Commands creating/starting a new array:
6625 mddev
= bdev
->bd_disk
->private_data
;
6632 /* Some actions do not requires the mutex */
6634 case GET_ARRAY_INFO
:
6635 if (!mddev
->raid_disks
&& !mddev
->external
)
6638 err
= get_array_info(mddev
, argp
);
6642 if (!mddev
->raid_disks
&& !mddev
->external
)
6645 err
= get_disk_info(mddev
, argp
);
6648 case SET_DISK_FAULTY
:
6649 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
6652 case GET_BITMAP_FILE
:
6653 err
= get_bitmap_file(mddev
, argp
);
6658 if (cmd
== ADD_NEW_DISK
)
6659 /* need to ensure md_delayed_delete() has completed */
6660 flush_workqueue(md_misc_wq
);
6662 if (cmd
== HOT_REMOVE_DISK
)
6663 /* need to ensure recovery thread has run */
6664 wait_event_interruptible_timeout(mddev
->sb_wait
,
6665 !test_bit(MD_RECOVERY_NEEDED
,
6667 msecs_to_jiffies(5000));
6668 if (cmd
== STOP_ARRAY
|| cmd
== STOP_ARRAY_RO
) {
6669 /* Need to flush page cache, and ensure no-one else opens
6672 mutex_lock(&mddev
->open_mutex
);
6673 if (mddev
->pers
&& atomic_read(&mddev
->openers
) > 1) {
6674 mutex_unlock(&mddev
->open_mutex
);
6678 set_bit(MD_STILL_CLOSED
, &mddev
->flags
);
6679 mutex_unlock(&mddev
->open_mutex
);
6680 sync_blockdev(bdev
);
6682 err
= mddev_lock(mddev
);
6685 "md: ioctl lock interrupted, reason %d, cmd %d\n",
6690 if (cmd
== SET_ARRAY_INFO
) {
6691 mdu_array_info_t info
;
6693 memset(&info
, 0, sizeof(info
));
6694 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
6699 err
= update_array_info(mddev
, &info
);
6701 printk(KERN_WARNING
"md: couldn't update"
6702 " array info. %d\n", err
);
6707 if (!list_empty(&mddev
->disks
)) {
6709 "md: array %s already has disks!\n",
6714 if (mddev
->raid_disks
) {
6716 "md: array %s already initialised!\n",
6721 err
= set_array_info(mddev
, &info
);
6723 printk(KERN_WARNING
"md: couldn't set"
6724 " array info. %d\n", err
);
6731 * Commands querying/configuring an existing array:
6733 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
6734 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
6735 if ((!mddev
->raid_disks
&& !mddev
->external
)
6736 && cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
6737 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
6738 && cmd
!= GET_BITMAP_FILE
) {
6744 * Commands even a read-only array can execute:
6747 case RESTART_ARRAY_RW
:
6748 err
= restart_array(mddev
);
6752 err
= do_md_stop(mddev
, 0, bdev
);
6756 err
= md_set_readonly(mddev
, bdev
);
6759 case HOT_REMOVE_DISK
:
6760 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
6764 /* We can support ADD_NEW_DISK on read-only arrays
6765 * on if we are re-adding a preexisting device.
6766 * So require mddev->pers and MD_DISK_SYNC.
6769 mdu_disk_info_t info
;
6770 if (copy_from_user(&info
, argp
, sizeof(info
)))
6772 else if (!(info
.state
& (1<<MD_DISK_SYNC
)))
6773 /* Need to clear read-only for this */
6776 err
= add_new_disk(mddev
, &info
);
6782 if (get_user(ro
, (int __user
*)(arg
))) {
6788 /* if the bdev is going readonly the value of mddev->ro
6789 * does not matter, no writes are coming
6794 /* are we are already prepared for writes? */
6798 /* transitioning to readauto need only happen for
6799 * arrays that call md_write_start
6802 err
= restart_array(mddev
);
6805 set_disk_ro(mddev
->gendisk
, 0);
6812 * The remaining ioctls are changing the state of the
6813 * superblock, so we do not allow them on read-only arrays.
6815 if (mddev
->ro
&& mddev
->pers
) {
6816 if (mddev
->ro
== 2) {
6818 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6819 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6820 /* mddev_unlock will wake thread */
6821 /* If a device failed while we were read-only, we
6822 * need to make sure the metadata is updated now.
6824 if (test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
6825 mddev_unlock(mddev
);
6826 wait_event(mddev
->sb_wait
,
6827 !test_bit(MD_CHANGE_DEVS
, &mddev
->flags
) &&
6828 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
6829 mddev_lock_nointr(mddev
);
6840 mdu_disk_info_t info
;
6841 if (copy_from_user(&info
, argp
, sizeof(info
)))
6844 err
= add_new_disk(mddev
, &info
);
6848 case CLUSTERED_DISK_NACK
:
6849 if (mddev_is_clustered(mddev
))
6850 md_cluster_ops
->new_disk_ack(mddev
, false);
6856 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
6860 err
= do_md_run(mddev
);
6863 case SET_BITMAP_FILE
:
6864 err
= set_bitmap_file(mddev
, (int)arg
);
6873 if (mddev
->hold_active
== UNTIL_IOCTL
&&
6875 mddev
->hold_active
= 0;
6876 mddev_unlock(mddev
);
6880 #ifdef CONFIG_COMPAT
6881 static int md_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
6882 unsigned int cmd
, unsigned long arg
)
6885 case HOT_REMOVE_DISK
:
6887 case SET_DISK_FAULTY
:
6888 case SET_BITMAP_FILE
:
6889 /* These take in integer arg, do not convert */
6892 arg
= (unsigned long)compat_ptr(arg
);
6896 return md_ioctl(bdev
, mode
, cmd
, arg
);
6898 #endif /* CONFIG_COMPAT */
6900 static int md_open(struct block_device
*bdev
, fmode_t mode
)
6903 * Succeed if we can lock the mddev, which confirms that
6904 * it isn't being stopped right now.
6906 struct mddev
*mddev
= mddev_find(bdev
->bd_dev
);
6912 if (mddev
->gendisk
!= bdev
->bd_disk
) {
6913 /* we are racing with mddev_put which is discarding this
6917 /* Wait until bdev->bd_disk is definitely gone */
6918 flush_workqueue(md_misc_wq
);
6919 /* Then retry the open from the top */
6920 return -ERESTARTSYS
;
6922 BUG_ON(mddev
!= bdev
->bd_disk
->private_data
);
6924 if ((err
= mutex_lock_interruptible(&mddev
->open_mutex
)))
6928 atomic_inc(&mddev
->openers
);
6929 clear_bit(MD_STILL_CLOSED
, &mddev
->flags
);
6930 mutex_unlock(&mddev
->open_mutex
);
6932 check_disk_change(bdev
);
6937 static void md_release(struct gendisk
*disk
, fmode_t mode
)
6939 struct mddev
*mddev
= disk
->private_data
;
6942 atomic_dec(&mddev
->openers
);
6946 static int md_media_changed(struct gendisk
*disk
)
6948 struct mddev
*mddev
= disk
->private_data
;
6950 return mddev
->changed
;
6953 static int md_revalidate(struct gendisk
*disk
)
6955 struct mddev
*mddev
= disk
->private_data
;
6960 static const struct block_device_operations md_fops
=
6962 .owner
= THIS_MODULE
,
6964 .release
= md_release
,
6966 #ifdef CONFIG_COMPAT
6967 .compat_ioctl
= md_compat_ioctl
,
6969 .getgeo
= md_getgeo
,
6970 .media_changed
= md_media_changed
,
6971 .revalidate_disk
= md_revalidate
,
6974 static int md_thread(void *arg
)
6976 struct md_thread
*thread
= arg
;
6979 * md_thread is a 'system-thread', it's priority should be very
6980 * high. We avoid resource deadlocks individually in each
6981 * raid personality. (RAID5 does preallocation) We also use RR and
6982 * the very same RT priority as kswapd, thus we will never get
6983 * into a priority inversion deadlock.
6985 * we definitely have to have equal or higher priority than
6986 * bdflush, otherwise bdflush will deadlock if there are too
6987 * many dirty RAID5 blocks.
6990 allow_signal(SIGKILL
);
6991 while (!kthread_should_stop()) {
6993 /* We need to wait INTERRUPTIBLE so that
6994 * we don't add to the load-average.
6995 * That means we need to be sure no signals are
6998 if (signal_pending(current
))
6999 flush_signals(current
);
7001 wait_event_interruptible_timeout
7003 test_bit(THREAD_WAKEUP
, &thread
->flags
)
7004 || kthread_should_stop(),
7007 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
7008 if (!kthread_should_stop())
7009 thread
->run(thread
);
7015 void md_wakeup_thread(struct md_thread
*thread
)
7018 pr_debug("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
7019 set_bit(THREAD_WAKEUP
, &thread
->flags
);
7020 wake_up(&thread
->wqueue
);
7023 EXPORT_SYMBOL(md_wakeup_thread
);
7025 struct md_thread
*md_register_thread(void (*run
) (struct md_thread
*),
7026 struct mddev
*mddev
, const char *name
)
7028 struct md_thread
*thread
;
7030 thread
= kzalloc(sizeof(struct md_thread
), GFP_KERNEL
);
7034 init_waitqueue_head(&thread
->wqueue
);
7037 thread
->mddev
= mddev
;
7038 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
7039 thread
->tsk
= kthread_run(md_thread
, thread
,
7041 mdname(thread
->mddev
),
7043 if (IS_ERR(thread
->tsk
)) {
7049 EXPORT_SYMBOL(md_register_thread
);
7051 void md_unregister_thread(struct md_thread
**threadp
)
7053 struct md_thread
*thread
= *threadp
;
7056 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread
->tsk
));
7057 /* Locking ensures that mddev_unlock does not wake_up a
7058 * non-existent thread
7060 spin_lock(&pers_lock
);
7062 spin_unlock(&pers_lock
);
7064 kthread_stop(thread
->tsk
);
7067 EXPORT_SYMBOL(md_unregister_thread
);
7069 void md_error(struct mddev
*mddev
, struct md_rdev
*rdev
)
7071 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
7074 if (!mddev
->pers
|| !mddev
->pers
->error_handler
)
7076 mddev
->pers
->error_handler(mddev
,rdev
);
7077 if (mddev
->degraded
)
7078 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7079 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
7080 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7081 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7082 md_wakeup_thread(mddev
->thread
);
7083 if (mddev
->event_work
.func
)
7084 queue_work(md_misc_wq
, &mddev
->event_work
);
7085 md_new_event_inintr(mddev
);
7087 EXPORT_SYMBOL(md_error
);
7089 /* seq_file implementation /proc/mdstat */
7091 static void status_unused(struct seq_file
*seq
)
7094 struct md_rdev
*rdev
;
7096 seq_printf(seq
, "unused devices: ");
7098 list_for_each_entry(rdev
, &pending_raid_disks
, same_set
) {
7099 char b
[BDEVNAME_SIZE
];
7101 seq_printf(seq
, "%s ",
7102 bdevname(rdev
->bdev
,b
));
7105 seq_printf(seq
, "<none>");
7107 seq_printf(seq
, "\n");
7110 static int status_resync(struct seq_file
*seq
, struct mddev
*mddev
)
7112 sector_t max_sectors
, resync
, res
;
7113 unsigned long dt
, db
;
7116 unsigned int per_milli
;
7118 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
7119 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
7120 max_sectors
= mddev
->resync_max_sectors
;
7122 max_sectors
= mddev
->dev_sectors
;
7124 resync
= mddev
->curr_resync
;
7126 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
7127 /* Still cleaning up */
7128 resync
= max_sectors
;
7130 resync
-= atomic_read(&mddev
->recovery_active
);
7133 if (mddev
->recovery_cp
< MaxSector
) {
7134 seq_printf(seq
, "\tresync=PENDING");
7140 seq_printf(seq
, "\tresync=DELAYED");
7144 WARN_ON(max_sectors
== 0);
7145 /* Pick 'scale' such that (resync>>scale)*1000 will fit
7146 * in a sector_t, and (max_sectors>>scale) will fit in a
7147 * u32, as those are the requirements for sector_div.
7148 * Thus 'scale' must be at least 10
7151 if (sizeof(sector_t
) > sizeof(unsigned long)) {
7152 while ( max_sectors
/2 > (1ULL<<(scale
+32)))
7155 res
= (resync
>>scale
)*1000;
7156 sector_div(res
, (u32
)((max_sectors
>>scale
)+1));
7160 int i
, x
= per_milli
/50, y
= 20-x
;
7161 seq_printf(seq
, "[");
7162 for (i
= 0; i
< x
; i
++)
7163 seq_printf(seq
, "=");
7164 seq_printf(seq
, ">");
7165 for (i
= 0; i
< y
; i
++)
7166 seq_printf(seq
, ".");
7167 seq_printf(seq
, "] ");
7169 seq_printf(seq
, " %s =%3u.%u%% (%llu/%llu)",
7170 (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)?
7172 (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)?
7174 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
7175 "resync" : "recovery"))),
7176 per_milli
/10, per_milli
% 10,
7177 (unsigned long long) resync
/2,
7178 (unsigned long long) max_sectors
/2);
7181 * dt: time from mark until now
7182 * db: blocks written from mark until now
7183 * rt: remaining time
7185 * rt is a sector_t, so could be 32bit or 64bit.
7186 * So we divide before multiply in case it is 32bit and close
7188 * We scale the divisor (db) by 32 to avoid losing precision
7189 * near the end of resync when the number of remaining sectors
7191 * We then divide rt by 32 after multiplying by db to compensate.
7192 * The '+1' avoids division by zero if db is very small.
7194 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
7196 db
= (mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
))
7197 - mddev
->resync_mark_cnt
;
7199 rt
= max_sectors
- resync
; /* number of remaining sectors */
7200 sector_div(rt
, db
/32+1);
7204 seq_printf(seq
, " finish=%lu.%lumin", (unsigned long)rt
/ 60,
7205 ((unsigned long)rt
% 60)/6);
7207 seq_printf(seq
, " speed=%ldK/sec", db
/2/dt
);
7211 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
7213 struct list_head
*tmp
;
7215 struct mddev
*mddev
;
7223 spin_lock(&all_mddevs_lock
);
7224 list_for_each(tmp
,&all_mddevs
)
7226 mddev
= list_entry(tmp
, struct mddev
, all_mddevs
);
7228 spin_unlock(&all_mddevs_lock
);
7231 spin_unlock(&all_mddevs_lock
);
7233 return (void*)2;/* tail */
7237 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
7239 struct list_head
*tmp
;
7240 struct mddev
*next_mddev
, *mddev
= v
;
7246 spin_lock(&all_mddevs_lock
);
7248 tmp
= all_mddevs
.next
;
7250 tmp
= mddev
->all_mddevs
.next
;
7251 if (tmp
!= &all_mddevs
)
7252 next_mddev
= mddev_get(list_entry(tmp
,struct mddev
,all_mddevs
));
7254 next_mddev
= (void*)2;
7257 spin_unlock(&all_mddevs_lock
);
7265 static void md_seq_stop(struct seq_file
*seq
, void *v
)
7267 struct mddev
*mddev
= v
;
7269 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
7273 static int md_seq_show(struct seq_file
*seq
, void *v
)
7275 struct mddev
*mddev
= v
;
7277 struct md_rdev
*rdev
;
7279 if (v
== (void*)1) {
7280 struct md_personality
*pers
;
7281 seq_printf(seq
, "Personalities : ");
7282 spin_lock(&pers_lock
);
7283 list_for_each_entry(pers
, &pers_list
, list
)
7284 seq_printf(seq
, "[%s] ", pers
->name
);
7286 spin_unlock(&pers_lock
);
7287 seq_printf(seq
, "\n");
7288 seq
->poll_event
= atomic_read(&md_event_count
);
7291 if (v
== (void*)2) {
7296 spin_lock(&mddev
->lock
);
7297 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
7298 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
7299 mddev
->pers
? "" : "in");
7302 seq_printf(seq
, " (read-only)");
7304 seq_printf(seq
, " (auto-read-only)");
7305 seq_printf(seq
, " %s", mddev
->pers
->name
);
7310 rdev_for_each_rcu(rdev
, mddev
) {
7311 char b
[BDEVNAME_SIZE
];
7312 seq_printf(seq
, " %s[%d]",
7313 bdevname(rdev
->bdev
,b
), rdev
->desc_nr
);
7314 if (test_bit(WriteMostly
, &rdev
->flags
))
7315 seq_printf(seq
, "(W)");
7316 if (test_bit(Faulty
, &rdev
->flags
)) {
7317 seq_printf(seq
, "(F)");
7320 if (rdev
->raid_disk
< 0)
7321 seq_printf(seq
, "(S)"); /* spare */
7322 if (test_bit(Replacement
, &rdev
->flags
))
7323 seq_printf(seq
, "(R)");
7324 sectors
+= rdev
->sectors
;
7328 if (!list_empty(&mddev
->disks
)) {
7330 seq_printf(seq
, "\n %llu blocks",
7331 (unsigned long long)
7332 mddev
->array_sectors
/ 2);
7334 seq_printf(seq
, "\n %llu blocks",
7335 (unsigned long long)sectors
/ 2);
7337 if (mddev
->persistent
) {
7338 if (mddev
->major_version
!= 0 ||
7339 mddev
->minor_version
!= 90) {
7340 seq_printf(seq
," super %d.%d",
7341 mddev
->major_version
,
7342 mddev
->minor_version
);
7344 } else if (mddev
->external
)
7345 seq_printf(seq
, " super external:%s",
7346 mddev
->metadata_type
);
7348 seq_printf(seq
, " super non-persistent");
7351 mddev
->pers
->status(seq
, mddev
);
7352 seq_printf(seq
, "\n ");
7353 if (mddev
->pers
->sync_request
) {
7354 if (status_resync(seq
, mddev
))
7355 seq_printf(seq
, "\n ");
7358 seq_printf(seq
, "\n ");
7360 bitmap_status(seq
, mddev
->bitmap
);
7362 seq_printf(seq
, "\n");
7364 spin_unlock(&mddev
->lock
);
7369 static const struct seq_operations md_seq_ops
= {
7370 .start
= md_seq_start
,
7371 .next
= md_seq_next
,
7372 .stop
= md_seq_stop
,
7373 .show
= md_seq_show
,
7376 static int md_seq_open(struct inode
*inode
, struct file
*file
)
7378 struct seq_file
*seq
;
7381 error
= seq_open(file
, &md_seq_ops
);
7385 seq
= file
->private_data
;
7386 seq
->poll_event
= atomic_read(&md_event_count
);
7390 static int md_unloading
;
7391 static unsigned int mdstat_poll(struct file
*filp
, poll_table
*wait
)
7393 struct seq_file
*seq
= filp
->private_data
;
7397 return POLLIN
|POLLRDNORM
|POLLERR
|POLLPRI
;
7398 poll_wait(filp
, &md_event_waiters
, wait
);
7400 /* always allow read */
7401 mask
= POLLIN
| POLLRDNORM
;
7403 if (seq
->poll_event
!= atomic_read(&md_event_count
))
7404 mask
|= POLLERR
| POLLPRI
;
7408 static const struct file_operations md_seq_fops
= {
7409 .owner
= THIS_MODULE
,
7410 .open
= md_seq_open
,
7412 .llseek
= seq_lseek
,
7413 .release
= seq_release_private
,
7414 .poll
= mdstat_poll
,
7417 int register_md_personality(struct md_personality
*p
)
7419 printk(KERN_INFO
"md: %s personality registered for level %d\n",
7421 spin_lock(&pers_lock
);
7422 list_add_tail(&p
->list
, &pers_list
);
7423 spin_unlock(&pers_lock
);
7426 EXPORT_SYMBOL(register_md_personality
);
7428 int unregister_md_personality(struct md_personality
*p
)
7430 printk(KERN_INFO
"md: %s personality unregistered\n", p
->name
);
7431 spin_lock(&pers_lock
);
7432 list_del_init(&p
->list
);
7433 spin_unlock(&pers_lock
);
7436 EXPORT_SYMBOL(unregister_md_personality
);
7438 int register_md_cluster_operations(struct md_cluster_operations
*ops
,
7439 struct module
*module
)
7442 spin_lock(&pers_lock
);
7443 if (md_cluster_ops
!= NULL
)
7446 md_cluster_ops
= ops
;
7447 md_cluster_mod
= module
;
7449 spin_unlock(&pers_lock
);
7452 EXPORT_SYMBOL(register_md_cluster_operations
);
7454 int unregister_md_cluster_operations(void)
7456 spin_lock(&pers_lock
);
7457 md_cluster_ops
= NULL
;
7458 spin_unlock(&pers_lock
);
7461 EXPORT_SYMBOL(unregister_md_cluster_operations
);
7463 int md_setup_cluster(struct mddev
*mddev
, int nodes
)
7467 err
= request_module("md-cluster");
7469 pr_err("md-cluster module not found.\n");
7473 spin_lock(&pers_lock
);
7474 if (!md_cluster_ops
|| !try_module_get(md_cluster_mod
)) {
7475 spin_unlock(&pers_lock
);
7478 spin_unlock(&pers_lock
);
7480 return md_cluster_ops
->join(mddev
, nodes
);
7483 void md_cluster_stop(struct mddev
*mddev
)
7485 if (!md_cluster_ops
)
7487 md_cluster_ops
->leave(mddev
);
7488 module_put(md_cluster_mod
);
7491 static int is_mddev_idle(struct mddev
*mddev
, int init
)
7493 struct md_rdev
*rdev
;
7499 rdev_for_each_rcu(rdev
, mddev
) {
7500 struct gendisk
*disk
= rdev
->bdev
->bd_contains
->bd_disk
;
7501 curr_events
= (int)part_stat_read(&disk
->part0
, sectors
[0]) +
7502 (int)part_stat_read(&disk
->part0
, sectors
[1]) -
7503 atomic_read(&disk
->sync_io
);
7504 /* sync IO will cause sync_io to increase before the disk_stats
7505 * as sync_io is counted when a request starts, and
7506 * disk_stats is counted when it completes.
7507 * So resync activity will cause curr_events to be smaller than
7508 * when there was no such activity.
7509 * non-sync IO will cause disk_stat to increase without
7510 * increasing sync_io so curr_events will (eventually)
7511 * be larger than it was before. Once it becomes
7512 * substantially larger, the test below will cause
7513 * the array to appear non-idle, and resync will slow
7515 * If there is a lot of outstanding resync activity when
7516 * we set last_event to curr_events, then all that activity
7517 * completing might cause the array to appear non-idle
7518 * and resync will be slowed down even though there might
7519 * not have been non-resync activity. This will only
7520 * happen once though. 'last_events' will soon reflect
7521 * the state where there is little or no outstanding
7522 * resync requests, and further resync activity will
7523 * always make curr_events less than last_events.
7526 if (init
|| curr_events
- rdev
->last_events
> 64) {
7527 rdev
->last_events
= curr_events
;
7535 void md_done_sync(struct mddev
*mddev
, int blocks
, int ok
)
7537 /* another "blocks" (512byte) blocks have been synced */
7538 atomic_sub(blocks
, &mddev
->recovery_active
);
7539 wake_up(&mddev
->recovery_wait
);
7541 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7542 set_bit(MD_RECOVERY_ERROR
, &mddev
->recovery
);
7543 md_wakeup_thread(mddev
->thread
);
7544 // stop recovery, signal do_sync ....
7547 EXPORT_SYMBOL(md_done_sync
);
7549 /* md_write_start(mddev, bi)
7550 * If we need to update some array metadata (e.g. 'active' flag
7551 * in superblock) before writing, schedule a superblock update
7552 * and wait for it to complete.
7554 void md_write_start(struct mddev
*mddev
, struct bio
*bi
)
7557 if (bio_data_dir(bi
) != WRITE
)
7560 BUG_ON(mddev
->ro
== 1);
7561 if (mddev
->ro
== 2) {
7562 /* need to switch to read/write */
7564 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7565 md_wakeup_thread(mddev
->thread
);
7566 md_wakeup_thread(mddev
->sync_thread
);
7569 atomic_inc(&mddev
->writes_pending
);
7570 if (mddev
->safemode
== 1)
7571 mddev
->safemode
= 0;
7572 if (mddev
->in_sync
) {
7573 spin_lock(&mddev
->lock
);
7574 if (mddev
->in_sync
) {
7576 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7577 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
7578 md_wakeup_thread(mddev
->thread
);
7581 spin_unlock(&mddev
->lock
);
7584 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7585 wait_event(mddev
->sb_wait
,
7586 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
7588 EXPORT_SYMBOL(md_write_start
);
7590 void md_write_end(struct mddev
*mddev
)
7592 if (atomic_dec_and_test(&mddev
->writes_pending
)) {
7593 if (mddev
->safemode
== 2)
7594 md_wakeup_thread(mddev
->thread
);
7595 else if (mddev
->safemode_delay
)
7596 mod_timer(&mddev
->safemode_timer
, jiffies
+ mddev
->safemode_delay
);
7599 EXPORT_SYMBOL(md_write_end
);
7601 /* md_allow_write(mddev)
7602 * Calling this ensures that the array is marked 'active' so that writes
7603 * may proceed without blocking. It is important to call this before
7604 * attempting a GFP_KERNEL allocation while holding the mddev lock.
7605 * Must be called with mddev_lock held.
7607 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
7608 * is dropped, so return -EAGAIN after notifying userspace.
7610 int md_allow_write(struct mddev
*mddev
)
7616 if (!mddev
->pers
->sync_request
)
7619 spin_lock(&mddev
->lock
);
7620 if (mddev
->in_sync
) {
7622 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7623 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
7624 if (mddev
->safemode_delay
&&
7625 mddev
->safemode
== 0)
7626 mddev
->safemode
= 1;
7627 spin_unlock(&mddev
->lock
);
7628 md_update_sb(mddev
, 0);
7629 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7631 spin_unlock(&mddev
->lock
);
7633 if (test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
7638 EXPORT_SYMBOL_GPL(md_allow_write
);
7640 #define SYNC_MARKS 10
7641 #define SYNC_MARK_STEP (3*HZ)
7642 #define UPDATE_FREQUENCY (5*60*HZ)
7643 void md_do_sync(struct md_thread
*thread
)
7645 struct mddev
*mddev
= thread
->mddev
;
7646 struct mddev
*mddev2
;
7647 unsigned int currspeed
= 0,
7649 sector_t max_sectors
,j
, io_sectors
, recovery_done
;
7650 unsigned long mark
[SYNC_MARKS
];
7651 unsigned long update_time
;
7652 sector_t mark_cnt
[SYNC_MARKS
];
7654 struct list_head
*tmp
;
7655 sector_t last_check
;
7657 struct md_rdev
*rdev
;
7658 char *desc
, *action
= NULL
;
7659 struct blk_plug plug
;
7661 /* just incase thread restarts... */
7662 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
7664 if (mddev
->ro
) {/* never try to sync a read-only array */
7665 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7669 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7670 if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)) {
7671 desc
= "data-check";
7673 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
7674 desc
= "requested-resync";
7678 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
7683 mddev
->last_sync_action
= action
?: desc
;
7685 /* we overload curr_resync somewhat here.
7686 * 0 == not engaged in resync at all
7687 * 2 == checking that there is no conflict with another sync
7688 * 1 == like 2, but have yielded to allow conflicting resync to
7690 * other == active in resync - this many blocks
7692 * Before starting a resync we must have set curr_resync to
7693 * 2, and then checked that every "conflicting" array has curr_resync
7694 * less than ours. When we find one that is the same or higher
7695 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
7696 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
7697 * This will mean we have to start checking from the beginning again.
7702 mddev
->curr_resync
= 2;
7705 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7707 for_each_mddev(mddev2
, tmp
) {
7708 if (mddev2
== mddev
)
7710 if (!mddev
->parallel_resync
7711 && mddev2
->curr_resync
7712 && match_mddev_units(mddev
, mddev2
)) {
7714 if (mddev
< mddev2
&& mddev
->curr_resync
== 2) {
7715 /* arbitrarily yield */
7716 mddev
->curr_resync
= 1;
7717 wake_up(&resync_wait
);
7719 if (mddev
> mddev2
&& mddev
->curr_resync
== 1)
7720 /* no need to wait here, we can wait the next
7721 * time 'round when curr_resync == 2
7724 /* We need to wait 'interruptible' so as not to
7725 * contribute to the load average, and not to
7726 * be caught by 'softlockup'
7728 prepare_to_wait(&resync_wait
, &wq
, TASK_INTERRUPTIBLE
);
7729 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
7730 mddev2
->curr_resync
>= mddev
->curr_resync
) {
7731 printk(KERN_INFO
"md: delaying %s of %s"
7732 " until %s has finished (they"
7733 " share one or more physical units)\n",
7734 desc
, mdname(mddev
), mdname(mddev2
));
7736 if (signal_pending(current
))
7737 flush_signals(current
);
7739 finish_wait(&resync_wait
, &wq
);
7742 finish_wait(&resync_wait
, &wq
);
7745 } while (mddev
->curr_resync
< 2);
7748 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7749 /* resync follows the size requested by the personality,
7750 * which defaults to physical size, but can be virtual size
7752 max_sectors
= mddev
->resync_max_sectors
;
7753 atomic64_set(&mddev
->resync_mismatches
, 0);
7754 /* we don't use the checkpoint if there's a bitmap */
7755 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7756 j
= mddev
->resync_min
;
7757 else if (!mddev
->bitmap
)
7758 j
= mddev
->recovery_cp
;
7760 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
7761 max_sectors
= mddev
->resync_max_sectors
;
7763 /* recovery follows the physical size of devices */
7764 max_sectors
= mddev
->dev_sectors
;
7767 rdev_for_each_rcu(rdev
, mddev
)
7768 if (rdev
->raid_disk
>= 0 &&
7769 !test_bit(Faulty
, &rdev
->flags
) &&
7770 !test_bit(In_sync
, &rdev
->flags
) &&
7771 rdev
->recovery_offset
< j
)
7772 j
= rdev
->recovery_offset
;
7775 /* If there is a bitmap, we need to make sure all
7776 * writes that started before we added a spare
7777 * complete before we start doing a recovery.
7778 * Otherwise the write might complete and (via
7779 * bitmap_endwrite) set a bit in the bitmap after the
7780 * recovery has checked that bit and skipped that
7783 if (mddev
->bitmap
) {
7784 mddev
->pers
->quiesce(mddev
, 1);
7785 mddev
->pers
->quiesce(mddev
, 0);
7789 printk(KERN_INFO
"md: %s of RAID array %s\n", desc
, mdname(mddev
));
7790 printk(KERN_INFO
"md: minimum _guaranteed_ speed:"
7791 " %d KB/sec/disk.\n", speed_min(mddev
));
7792 printk(KERN_INFO
"md: using maximum available idle IO bandwidth "
7793 "(but not more than %d KB/sec) for %s.\n",
7794 speed_max(mddev
), desc
);
7796 is_mddev_idle(mddev
, 1); /* this initializes IO event counters */
7799 for (m
= 0; m
< SYNC_MARKS
; m
++) {
7801 mark_cnt
[m
] = io_sectors
;
7804 mddev
->resync_mark
= mark
[last_mark
];
7805 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
7808 * Tune reconstruction:
7810 window
= 32*(PAGE_SIZE
/512);
7811 printk(KERN_INFO
"md: using %dk window, over a total of %lluk.\n",
7812 window
/2, (unsigned long long)max_sectors
/2);
7814 atomic_set(&mddev
->recovery_active
, 0);
7819 "md: resuming %s of %s from checkpoint.\n",
7820 desc
, mdname(mddev
));
7821 mddev
->curr_resync
= j
;
7823 mddev
->curr_resync
= 3; /* no longer delayed */
7824 mddev
->curr_resync_completed
= j
;
7825 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
7826 md_new_event(mddev
);
7827 update_time
= jiffies
;
7829 blk_start_plug(&plug
);
7830 while (j
< max_sectors
) {
7835 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
7836 ((mddev
->curr_resync
> mddev
->curr_resync_completed
&&
7837 (mddev
->curr_resync
- mddev
->curr_resync_completed
)
7838 > (max_sectors
>> 4)) ||
7839 time_after_eq(jiffies
, update_time
+ UPDATE_FREQUENCY
) ||
7840 (j
- mddev
->curr_resync_completed
)*2
7841 >= mddev
->resync_max
- mddev
->curr_resync_completed
||
7842 mddev
->curr_resync_completed
> mddev
->resync_max
7844 /* time to update curr_resync_completed */
7845 wait_event(mddev
->recovery_wait
,
7846 atomic_read(&mddev
->recovery_active
) == 0);
7847 mddev
->curr_resync_completed
= j
;
7848 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) &&
7849 j
> mddev
->recovery_cp
)
7850 mddev
->recovery_cp
= j
;
7851 update_time
= jiffies
;
7852 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7853 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
7856 while (j
>= mddev
->resync_max
&&
7857 !test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
7858 /* As this condition is controlled by user-space,
7859 * we can block indefinitely, so use '_interruptible'
7860 * to avoid triggering warnings.
7862 flush_signals(current
); /* just in case */
7863 wait_event_interruptible(mddev
->recovery_wait
,
7864 mddev
->resync_max
> j
7865 || test_bit(MD_RECOVERY_INTR
,
7869 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7872 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
);
7874 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7878 if (!skipped
) { /* actual IO requested */
7879 io_sectors
+= sectors
;
7880 atomic_add(sectors
, &mddev
->recovery_active
);
7883 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7887 if (j
> max_sectors
)
7888 /* when skipping, extra large numbers can be returned. */
7891 mddev
->curr_resync
= j
;
7892 mddev
->curr_mark_cnt
= io_sectors
;
7893 if (last_check
== 0)
7894 /* this is the earliest that rebuild will be
7895 * visible in /proc/mdstat
7897 md_new_event(mddev
);
7899 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
7902 last_check
= io_sectors
;
7904 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
7906 int next
= (last_mark
+1) % SYNC_MARKS
;
7908 mddev
->resync_mark
= mark
[next
];
7909 mddev
->resync_mark_cnt
= mark_cnt
[next
];
7910 mark
[next
] = jiffies
;
7911 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
7915 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7919 * this loop exits only if either when we are slower than
7920 * the 'hard' speed limit, or the system was IO-idle for
7922 * the system might be non-idle CPU-wise, but we only care
7923 * about not overloading the IO subsystem. (things like an
7924 * e2fsck being done on the RAID array should execute fast)
7928 recovery_done
= io_sectors
- atomic_read(&mddev
->recovery_active
);
7929 currspeed
= ((unsigned long)(recovery_done
- mddev
->resync_mark_cnt
))/2
7930 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
7932 if (currspeed
> speed_min(mddev
)) {
7933 if (currspeed
> speed_max(mddev
)) {
7937 if (!is_mddev_idle(mddev
, 0)) {
7939 * Give other IO more of a chance.
7940 * The faster the devices, the less we wait.
7942 wait_event(mddev
->recovery_wait
,
7943 !atomic_read(&mddev
->recovery_active
));
7947 printk(KERN_INFO
"md: %s: %s %s.\n",mdname(mddev
), desc
,
7948 test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)
7949 ? "interrupted" : "done");
7951 * this also signals 'finished resyncing' to md_stop
7953 blk_finish_plug(&plug
);
7954 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
7956 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
7957 !test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
7958 mddev
->curr_resync
> 2) {
7959 mddev
->curr_resync_completed
= mddev
->curr_resync
;
7960 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
7962 /* tell personality that we are finished */
7963 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
);
7965 if (!test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
) &&
7966 mddev
->curr_resync
> 2) {
7967 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7968 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
7969 if (mddev
->curr_resync
>= mddev
->recovery_cp
) {
7971 "md: checkpointing %s of %s.\n",
7972 desc
, mdname(mddev
));
7973 if (test_bit(MD_RECOVERY_ERROR
,
7975 mddev
->recovery_cp
=
7976 mddev
->curr_resync_completed
;
7978 mddev
->recovery_cp
=
7982 mddev
->recovery_cp
= MaxSector
;
7984 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7985 mddev
->curr_resync
= MaxSector
;
7987 rdev_for_each_rcu(rdev
, mddev
)
7988 if (rdev
->raid_disk
>= 0 &&
7989 mddev
->delta_disks
>= 0 &&
7990 !test_bit(Faulty
, &rdev
->flags
) &&
7991 !test_bit(In_sync
, &rdev
->flags
) &&
7992 rdev
->recovery_offset
< mddev
->curr_resync
)
7993 rdev
->recovery_offset
= mddev
->curr_resync
;
7998 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
8000 spin_lock(&mddev
->lock
);
8001 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
8002 /* We completed so min/max setting can be forgotten if used. */
8003 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
8004 mddev
->resync_min
= 0;
8005 mddev
->resync_max
= MaxSector
;
8006 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
8007 mddev
->resync_min
= mddev
->curr_resync_completed
;
8008 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
8009 mddev
->curr_resync
= 0;
8010 spin_unlock(&mddev
->lock
);
8012 wake_up(&resync_wait
);
8013 md_wakeup_thread(mddev
->thread
);
8016 EXPORT_SYMBOL_GPL(md_do_sync
);
8018 static int remove_and_add_spares(struct mddev
*mddev
,
8019 struct md_rdev
*this)
8021 struct md_rdev
*rdev
;
8025 rdev_for_each(rdev
, mddev
)
8026 if ((this == NULL
|| rdev
== this) &&
8027 rdev
->raid_disk
>= 0 &&
8028 !test_bit(Blocked
, &rdev
->flags
) &&
8029 (test_bit(Faulty
, &rdev
->flags
) ||
8030 ! test_bit(In_sync
, &rdev
->flags
)) &&
8031 atomic_read(&rdev
->nr_pending
)==0) {
8032 if (mddev
->pers
->hot_remove_disk(
8033 mddev
, rdev
) == 0) {
8034 sysfs_unlink_rdev(mddev
, rdev
);
8035 rdev
->raid_disk
= -1;
8039 if (removed
&& mddev
->kobj
.sd
)
8040 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
8042 if (this && removed
)
8045 rdev_for_each(rdev
, mddev
) {
8046 if (this && this != rdev
)
8048 if (rdev
->raid_disk
>= 0 &&
8049 !test_bit(In_sync
, &rdev
->flags
) &&
8050 !test_bit(Faulty
, &rdev
->flags
))
8052 if (rdev
->raid_disk
>= 0)
8054 if (test_bit(Faulty
, &rdev
->flags
))
8057 ! (rdev
->saved_raid_disk
>= 0 &&
8058 !test_bit(Bitmap_sync
, &rdev
->flags
)))
8061 if (rdev
->saved_raid_disk
< 0)
8062 rdev
->recovery_offset
= 0;
8064 hot_add_disk(mddev
, rdev
) == 0) {
8065 if (sysfs_link_rdev(mddev
, rdev
))
8066 /* failure here is OK */;
8068 md_new_event(mddev
);
8069 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
8074 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
8078 static void md_start_sync(struct work_struct
*ws
)
8080 struct mddev
*mddev
= container_of(ws
, struct mddev
, del_work
);
8082 mddev
->sync_thread
= md_register_thread(md_do_sync
,
8085 if (!mddev
->sync_thread
) {
8086 printk(KERN_ERR
"%s: could not start resync"
8089 /* leave the spares where they are, it shouldn't hurt */
8090 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8091 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
8092 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
8093 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
8094 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8095 wake_up(&resync_wait
);
8096 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
8098 if (mddev
->sysfs_action
)
8099 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
8101 md_wakeup_thread(mddev
->sync_thread
);
8102 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
8103 md_new_event(mddev
);
8107 * This routine is regularly called by all per-raid-array threads to
8108 * deal with generic issues like resync and super-block update.
8109 * Raid personalities that don't have a thread (linear/raid0) do not
8110 * need this as they never do any recovery or update the superblock.
8112 * It does not do any resync itself, but rather "forks" off other threads
8113 * to do that as needed.
8114 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
8115 * "->recovery" and create a thread at ->sync_thread.
8116 * When the thread finishes it sets MD_RECOVERY_DONE
8117 * and wakeups up this thread which will reap the thread and finish up.
8118 * This thread also removes any faulty devices (with nr_pending == 0).
8120 * The overall approach is:
8121 * 1/ if the superblock needs updating, update it.
8122 * 2/ If a recovery thread is running, don't do anything else.
8123 * 3/ If recovery has finished, clean up, possibly marking spares active.
8124 * 4/ If there are any faulty devices, remove them.
8125 * 5/ If array is degraded, try to add spares devices
8126 * 6/ If array has spares or is not in-sync, start a resync thread.
8128 void md_check_recovery(struct mddev
*mddev
)
8130 if (mddev
->suspended
)
8134 bitmap_daemon_work(mddev
);
8136 if (signal_pending(current
)) {
8137 if (mddev
->pers
->sync_request
&& !mddev
->external
) {
8138 printk(KERN_INFO
"md: %s in immediate safe mode\n",
8140 mddev
->safemode
= 2;
8142 flush_signals(current
);
8145 if (mddev
->ro
&& !test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
8148 (mddev
->flags
& MD_UPDATE_SB_FLAGS
& ~ (1<<MD_CHANGE_PENDING
)) ||
8149 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
8150 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
8151 (mddev
->external
== 0 && mddev
->safemode
== 1) ||
8152 (mddev
->safemode
== 2 && ! atomic_read(&mddev
->writes_pending
)
8153 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
8157 if (mddev_trylock(mddev
)) {
8161 struct md_rdev
*rdev
;
8162 if (!mddev
->external
&& mddev
->in_sync
)
8163 /* 'Blocked' flag not needed as failed devices
8164 * will be recorded if array switched to read/write.
8165 * Leaving it set will prevent the device
8166 * from being removed.
8168 rdev_for_each(rdev
, mddev
)
8169 clear_bit(Blocked
, &rdev
->flags
);
8170 /* On a read-only array we can:
8171 * - remove failed devices
8172 * - add already-in_sync devices if the array itself
8174 * As we only add devices that are already in-sync,
8175 * we can activate the spares immediately.
8177 remove_and_add_spares(mddev
, NULL
);
8178 /* There is no thread, but we need to call
8179 * ->spare_active and clear saved_raid_disk
8181 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8182 md_reap_sync_thread(mddev
);
8183 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8184 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
8185 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
8189 if (!mddev
->external
) {
8191 spin_lock(&mddev
->lock
);
8192 if (mddev
->safemode
&&
8193 !atomic_read(&mddev
->writes_pending
) &&
8195 mddev
->recovery_cp
== MaxSector
) {
8198 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
8200 if (mddev
->safemode
== 1)
8201 mddev
->safemode
= 0;
8202 spin_unlock(&mddev
->lock
);
8204 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
8207 if (mddev
->flags
& MD_UPDATE_SB_FLAGS
)
8208 md_update_sb(mddev
, 0);
8210 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
8211 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
8212 /* resync/recovery still happening */
8213 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
8216 if (mddev
->sync_thread
) {
8217 md_reap_sync_thread(mddev
);
8220 /* Set RUNNING before clearing NEEDED to avoid
8221 * any transients in the value of "sync_action".
8223 mddev
->curr_resync_completed
= 0;
8224 spin_lock(&mddev
->lock
);
8225 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8226 spin_unlock(&mddev
->lock
);
8227 /* Clear some bits that don't mean anything, but
8230 clear_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8231 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
8233 if (!test_and_clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
8234 test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
8236 /* no recovery is running.
8237 * remove any failed drives, then
8238 * add spares if possible.
8239 * Spares are also removed and re-added, to allow
8240 * the personality to fail the re-add.
8243 if (mddev
->reshape_position
!= MaxSector
) {
8244 if (mddev
->pers
->check_reshape
== NULL
||
8245 mddev
->pers
->check_reshape(mddev
) != 0)
8246 /* Cannot proceed */
8248 set_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
8249 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8250 } else if ((spares
= remove_and_add_spares(mddev
, NULL
))) {
8251 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8252 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
8253 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
8254 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8255 } else if (mddev
->recovery_cp
< MaxSector
) {
8256 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8257 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8258 } else if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
8259 /* nothing to be done ... */
8262 if (mddev
->pers
->sync_request
) {
8264 /* We are adding a device or devices to an array
8265 * which has the bitmap stored on all devices.
8266 * So make sure all bitmap pages get written
8268 bitmap_write_all(mddev
->bitmap
);
8270 INIT_WORK(&mddev
->del_work
, md_start_sync
);
8271 queue_work(md_misc_wq
, &mddev
->del_work
);
8275 if (!mddev
->sync_thread
) {
8276 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8277 wake_up(&resync_wait
);
8278 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
8280 if (mddev
->sysfs_action
)
8281 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
8284 wake_up(&mddev
->sb_wait
);
8285 mddev_unlock(mddev
);
8288 EXPORT_SYMBOL(md_check_recovery
);
8290 void md_reap_sync_thread(struct mddev
*mddev
)
8292 struct md_rdev
*rdev
;
8294 /* resync has finished, collect result */
8295 md_unregister_thread(&mddev
->sync_thread
);
8296 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
8297 !test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
8299 /* activate any spares */
8300 if (mddev
->pers
->spare_active(mddev
)) {
8301 sysfs_notify(&mddev
->kobj
, NULL
,
8303 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
8306 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
8307 mddev
->pers
->finish_reshape
)
8308 mddev
->pers
->finish_reshape(mddev
);
8310 /* If array is no-longer degraded, then any saved_raid_disk
8311 * information must be scrapped.
8313 if (!mddev
->degraded
)
8314 rdev_for_each(rdev
, mddev
)
8315 rdev
->saved_raid_disk
= -1;
8317 md_update_sb(mddev
, 1);
8318 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8319 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
8320 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8321 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
8322 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
8323 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
8324 wake_up(&resync_wait
);
8325 /* flag recovery needed just to double check */
8326 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
8327 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
8328 md_new_event(mddev
);
8329 if (mddev
->event_work
.func
)
8330 queue_work(md_misc_wq
, &mddev
->event_work
);
8332 EXPORT_SYMBOL(md_reap_sync_thread
);
8334 void md_wait_for_blocked_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
8336 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
8337 wait_event_timeout(rdev
->blocked_wait
,
8338 !test_bit(Blocked
, &rdev
->flags
) &&
8339 !test_bit(BlockedBadBlocks
, &rdev
->flags
),
8340 msecs_to_jiffies(5000));
8341 rdev_dec_pending(rdev
, mddev
);
8343 EXPORT_SYMBOL(md_wait_for_blocked_rdev
);
8345 void md_finish_reshape(struct mddev
*mddev
)
8347 /* called be personality module when reshape completes. */
8348 struct md_rdev
*rdev
;
8350 rdev_for_each(rdev
, mddev
) {
8351 if (rdev
->data_offset
> rdev
->new_data_offset
)
8352 rdev
->sectors
+= rdev
->data_offset
- rdev
->new_data_offset
;
8354 rdev
->sectors
-= rdev
->new_data_offset
- rdev
->data_offset
;
8355 rdev
->data_offset
= rdev
->new_data_offset
;
8358 EXPORT_SYMBOL(md_finish_reshape
);
8360 /* Bad block management.
8361 * We can record which blocks on each device are 'bad' and so just
8362 * fail those blocks, or that stripe, rather than the whole device.
8363 * Entries in the bad-block table are 64bits wide. This comprises:
8364 * Length of bad-range, in sectors: 0-511 for lengths 1-512
8365 * Start of bad-range, sector offset, 54 bits (allows 8 exbibytes)
8366 * A 'shift' can be set so that larger blocks are tracked and
8367 * consequently larger devices can be covered.
8368 * 'Acknowledged' flag - 1 bit. - the most significant bit.
8370 * Locking of the bad-block table uses a seqlock so md_is_badblock
8371 * might need to retry if it is very unlucky.
8372 * We will sometimes want to check for bad blocks in a bi_end_io function,
8373 * so we use the write_seqlock_irq variant.
8375 * When looking for a bad block we specify a range and want to
8376 * know if any block in the range is bad. So we binary-search
8377 * to the last range that starts at-or-before the given endpoint,
8378 * (or "before the sector after the target range")
8379 * then see if it ends after the given start.
8381 * 0 if there are no known bad blocks in the range
8382 * 1 if there are known bad block which are all acknowledged
8383 * -1 if there are bad blocks which have not yet been acknowledged in metadata.
8384 * plus the start/length of the first bad section we overlap.
8386 int md_is_badblock(struct badblocks
*bb
, sector_t s
, int sectors
,
8387 sector_t
*first_bad
, int *bad_sectors
)
8393 sector_t target
= s
+ sectors
;
8396 if (bb
->shift
> 0) {
8397 /* round the start down, and the end up */
8399 target
+= (1<<bb
->shift
) - 1;
8400 target
>>= bb
->shift
;
8401 sectors
= target
- s
;
8403 /* 'target' is now the first block after the bad range */
8406 seq
= read_seqbegin(&bb
->lock
);
8411 /* Binary search between lo and hi for 'target'
8412 * i.e. for the last range that starts before 'target'
8414 /* INVARIANT: ranges before 'lo' and at-or-after 'hi'
8415 * are known not to be the last range before target.
8416 * VARIANT: hi-lo is the number of possible
8417 * ranges, and decreases until it reaches 1
8419 while (hi
- lo
> 1) {
8420 int mid
= (lo
+ hi
) / 2;
8421 sector_t a
= BB_OFFSET(p
[mid
]);
8423 /* This could still be the one, earlier ranges
8427 /* This and later ranges are definitely out. */
8430 /* 'lo' might be the last that started before target, but 'hi' isn't */
8432 /* need to check all range that end after 's' to see if
8433 * any are unacknowledged.
8436 BB_OFFSET(p
[lo
]) + BB_LEN(p
[lo
]) > s
) {
8437 if (BB_OFFSET(p
[lo
]) < target
) {
8438 /* starts before the end, and finishes after
8439 * the start, so they must overlap
8441 if (rv
!= -1 && BB_ACK(p
[lo
]))
8445 *first_bad
= BB_OFFSET(p
[lo
]);
8446 *bad_sectors
= BB_LEN(p
[lo
]);
8452 if (read_seqretry(&bb
->lock
, seq
))
8457 EXPORT_SYMBOL_GPL(md_is_badblock
);
8460 * Add a range of bad blocks to the table.
8461 * This might extend the table, or might contract it
8462 * if two adjacent ranges can be merged.
8463 * We binary-search to find the 'insertion' point, then
8464 * decide how best to handle it.
8466 static int md_set_badblocks(struct badblocks
*bb
, sector_t s
, int sectors
,
8472 unsigned long flags
;
8475 /* badblocks are disabled */
8479 /* round the start down, and the end up */
8480 sector_t next
= s
+ sectors
;
8482 next
+= (1<<bb
->shift
) - 1;
8487 write_seqlock_irqsave(&bb
->lock
, flags
);
8492 /* Find the last range that starts at-or-before 's' */
8493 while (hi
- lo
> 1) {
8494 int mid
= (lo
+ hi
) / 2;
8495 sector_t a
= BB_OFFSET(p
[mid
]);
8501 if (hi
> lo
&& BB_OFFSET(p
[lo
]) > s
)
8505 /* we found a range that might merge with the start
8508 sector_t a
= BB_OFFSET(p
[lo
]);
8509 sector_t e
= a
+ BB_LEN(p
[lo
]);
8510 int ack
= BB_ACK(p
[lo
]);
8512 /* Yes, we can merge with a previous range */
8513 if (s
== a
&& s
+ sectors
>= e
)
8514 /* new range covers old */
8517 ack
= ack
&& acknowledged
;
8519 if (e
< s
+ sectors
)
8521 if (e
- a
<= BB_MAX_LEN
) {
8522 p
[lo
] = BB_MAKE(a
, e
-a
, ack
);
8525 /* does not all fit in one range,
8526 * make p[lo] maximal
8528 if (BB_LEN(p
[lo
]) != BB_MAX_LEN
)
8529 p
[lo
] = BB_MAKE(a
, BB_MAX_LEN
, ack
);
8535 if (sectors
&& hi
< bb
->count
) {
8536 /* 'hi' points to the first range that starts after 's'.
8537 * Maybe we can merge with the start of that range */
8538 sector_t a
= BB_OFFSET(p
[hi
]);
8539 sector_t e
= a
+ BB_LEN(p
[hi
]);
8540 int ack
= BB_ACK(p
[hi
]);
8541 if (a
<= s
+ sectors
) {
8542 /* merging is possible */
8543 if (e
<= s
+ sectors
) {
8548 ack
= ack
&& acknowledged
;
8551 if (e
- a
<= BB_MAX_LEN
) {
8552 p
[hi
] = BB_MAKE(a
, e
-a
, ack
);
8555 p
[hi
] = BB_MAKE(a
, BB_MAX_LEN
, ack
);
8563 if (sectors
== 0 && hi
< bb
->count
) {
8564 /* we might be able to combine lo and hi */
8565 /* Note: 's' is at the end of 'lo' */
8566 sector_t a
= BB_OFFSET(p
[hi
]);
8567 int lolen
= BB_LEN(p
[lo
]);
8568 int hilen
= BB_LEN(p
[hi
]);
8569 int newlen
= lolen
+ hilen
- (s
- a
);
8570 if (s
>= a
&& newlen
< BB_MAX_LEN
) {
8571 /* yes, we can combine them */
8572 int ack
= BB_ACK(p
[lo
]) && BB_ACK(p
[hi
]);
8573 p
[lo
] = BB_MAKE(BB_OFFSET(p
[lo
]), newlen
, ack
);
8574 memmove(p
+ hi
, p
+ hi
+ 1,
8575 (bb
->count
- hi
- 1) * 8);
8580 /* didn't merge (it all).
8581 * Need to add a range just before 'hi' */
8582 if (bb
->count
>= MD_MAX_BADBLOCKS
) {
8583 /* No room for more */
8587 int this_sectors
= sectors
;
8588 memmove(p
+ hi
+ 1, p
+ hi
,
8589 (bb
->count
- hi
) * 8);
8592 if (this_sectors
> BB_MAX_LEN
)
8593 this_sectors
= BB_MAX_LEN
;
8594 p
[hi
] = BB_MAKE(s
, this_sectors
, acknowledged
);
8595 sectors
-= this_sectors
;
8602 bb
->unacked_exist
= 1;
8603 write_sequnlock_irqrestore(&bb
->lock
, flags
);
8608 int rdev_set_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
8613 s
+= rdev
->new_data_offset
;
8615 s
+= rdev
->data_offset
;
8616 rv
= md_set_badblocks(&rdev
->badblocks
,
8619 /* Make sure they get written out promptly */
8620 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
8621 set_bit(MD_CHANGE_CLEAN
, &rdev
->mddev
->flags
);
8622 set_bit(MD_CHANGE_PENDING
, &rdev
->mddev
->flags
);
8623 md_wakeup_thread(rdev
->mddev
->thread
);
8627 EXPORT_SYMBOL_GPL(rdev_set_badblocks
);
8630 * Remove a range of bad blocks from the table.
8631 * This may involve extending the table if we spilt a region,
8632 * but it must not fail. So if the table becomes full, we just
8633 * drop the remove request.
8635 static int md_clear_badblocks(struct badblocks
*bb
, sector_t s
, int sectors
)
8639 sector_t target
= s
+ sectors
;
8642 if (bb
->shift
> 0) {
8643 /* When clearing we round the start up and the end down.
8644 * This should not matter as the shift should align with
8645 * the block size and no rounding should ever be needed.
8646 * However it is better the think a block is bad when it
8647 * isn't than to think a block is not bad when it is.
8649 s
+= (1<<bb
->shift
) - 1;
8651 target
>>= bb
->shift
;
8652 sectors
= target
- s
;
8655 write_seqlock_irq(&bb
->lock
);
8660 /* Find the last range that starts before 'target' */
8661 while (hi
- lo
> 1) {
8662 int mid
= (lo
+ hi
) / 2;
8663 sector_t a
= BB_OFFSET(p
[mid
]);
8670 /* p[lo] is the last range that could overlap the
8671 * current range. Earlier ranges could also overlap,
8672 * but only this one can overlap the end of the range.
8674 if (BB_OFFSET(p
[lo
]) + BB_LEN(p
[lo
]) > target
) {
8675 /* Partial overlap, leave the tail of this range */
8676 int ack
= BB_ACK(p
[lo
]);
8677 sector_t a
= BB_OFFSET(p
[lo
]);
8678 sector_t end
= a
+ BB_LEN(p
[lo
]);
8681 /* we need to split this range */
8682 if (bb
->count
>= MD_MAX_BADBLOCKS
) {
8686 memmove(p
+lo
+1, p
+lo
, (bb
->count
- lo
) * 8);
8688 p
[lo
] = BB_MAKE(a
, s
-a
, ack
);
8691 p
[lo
] = BB_MAKE(target
, end
- target
, ack
);
8692 /* there is no longer an overlap */
8697 BB_OFFSET(p
[lo
]) + BB_LEN(p
[lo
]) > s
) {
8698 /* This range does overlap */
8699 if (BB_OFFSET(p
[lo
]) < s
) {
8700 /* Keep the early parts of this range. */
8701 int ack
= BB_ACK(p
[lo
]);
8702 sector_t start
= BB_OFFSET(p
[lo
]);
8703 p
[lo
] = BB_MAKE(start
, s
- start
, ack
);
8704 /* now low doesn't overlap, so.. */
8709 /* 'lo' is strictly before, 'hi' is strictly after,
8710 * anything between needs to be discarded
8713 memmove(p
+lo
+1, p
+hi
, (bb
->count
- hi
) * 8);
8714 bb
->count
-= (hi
- lo
- 1);
8720 write_sequnlock_irq(&bb
->lock
);
8724 int rdev_clear_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
8728 s
+= rdev
->new_data_offset
;
8730 s
+= rdev
->data_offset
;
8731 return md_clear_badblocks(&rdev
->badblocks
,
8734 EXPORT_SYMBOL_GPL(rdev_clear_badblocks
);
8737 * Acknowledge all bad blocks in a list.
8738 * This only succeeds if ->changed is clear. It is used by
8739 * in-kernel metadata updates
8741 void md_ack_all_badblocks(struct badblocks
*bb
)
8743 if (bb
->page
== NULL
|| bb
->changed
)
8744 /* no point even trying */
8746 write_seqlock_irq(&bb
->lock
);
8748 if (bb
->changed
== 0 && bb
->unacked_exist
) {
8751 for (i
= 0; i
< bb
->count
; i
++) {
8752 if (!BB_ACK(p
[i
])) {
8753 sector_t start
= BB_OFFSET(p
[i
]);
8754 int len
= BB_LEN(p
[i
]);
8755 p
[i
] = BB_MAKE(start
, len
, 1);
8758 bb
->unacked_exist
= 0;
8760 write_sequnlock_irq(&bb
->lock
);
8762 EXPORT_SYMBOL_GPL(md_ack_all_badblocks
);
8764 /* sysfs access to bad-blocks list.
8765 * We present two files.
8766 * 'bad-blocks' lists sector numbers and lengths of ranges that
8767 * are recorded as bad. The list is truncated to fit within
8768 * the one-page limit of sysfs.
8769 * Writing "sector length" to this file adds an acknowledged
8771 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
8772 * been acknowledged. Writing to this file adds bad blocks
8773 * without acknowledging them. This is largely for testing.
8777 badblocks_show(struct badblocks
*bb
, char *page
, int unack
)
8788 seq
= read_seqbegin(&bb
->lock
);
8793 while (len
< PAGE_SIZE
&& i
< bb
->count
) {
8794 sector_t s
= BB_OFFSET(p
[i
]);
8795 unsigned int length
= BB_LEN(p
[i
]);
8796 int ack
= BB_ACK(p
[i
]);
8802 len
+= snprintf(page
+len
, PAGE_SIZE
-len
, "%llu %u\n",
8803 (unsigned long long)s
<< bb
->shift
,
8804 length
<< bb
->shift
);
8806 if (unack
&& len
== 0)
8807 bb
->unacked_exist
= 0;
8809 if (read_seqretry(&bb
->lock
, seq
))
8818 badblocks_store(struct badblocks
*bb
, const char *page
, size_t len
, int unack
)
8820 unsigned long long sector
;
8824 /* Allow clearing via sysfs *only* for testing/debugging.
8825 * Normally only a successful write may clear a badblock
8828 if (page
[0] == '-') {
8832 #endif /* DO_DEBUG */
8834 switch (sscanf(page
, "%llu %d%c", §or
, &length
, &newline
)) {
8836 if (newline
!= '\n')
8848 md_clear_badblocks(bb
, sector
, length
);
8851 #endif /* DO_DEBUG */
8852 if (md_set_badblocks(bb
, sector
, length
, !unack
))
8858 static int md_notify_reboot(struct notifier_block
*this,
8859 unsigned long code
, void *x
)
8861 struct list_head
*tmp
;
8862 struct mddev
*mddev
;
8865 for_each_mddev(mddev
, tmp
) {
8866 if (mddev_trylock(mddev
)) {
8868 __md_stop_writes(mddev
);
8869 if (mddev
->persistent
)
8870 mddev
->safemode
= 2;
8871 mddev_unlock(mddev
);
8876 * certain more exotic SCSI devices are known to be
8877 * volatile wrt too early system reboots. While the
8878 * right place to handle this issue is the given
8879 * driver, we do want to have a safe RAID driver ...
8887 static struct notifier_block md_notifier
= {
8888 .notifier_call
= md_notify_reboot
,
8890 .priority
= INT_MAX
, /* before any real devices */
8893 static void md_geninit(void)
8895 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
8897 proc_create("mdstat", S_IRUGO
, NULL
, &md_seq_fops
);
8900 static int __init
md_init(void)
8904 md_wq
= alloc_workqueue("md", WQ_MEM_RECLAIM
, 0);
8908 md_misc_wq
= alloc_workqueue("md_misc", 0, 0);
8912 if ((ret
= register_blkdev(MD_MAJOR
, "md")) < 0)
8915 if ((ret
= register_blkdev(0, "mdp")) < 0)
8919 blk_register_region(MKDEV(MD_MAJOR
, 0), 512, THIS_MODULE
,
8920 md_probe
, NULL
, NULL
);
8921 blk_register_region(MKDEV(mdp_major
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
8922 md_probe
, NULL
, NULL
);
8924 register_reboot_notifier(&md_notifier
);
8925 raid_table_header
= register_sysctl_table(raid_root_table
);
8931 unregister_blkdev(MD_MAJOR
, "md");
8933 destroy_workqueue(md_misc_wq
);
8935 destroy_workqueue(md_wq
);
8940 static void check_sb_changes(struct mddev
*mddev
, struct md_rdev
*rdev
)
8942 struct mdp_superblock_1
*sb
= page_address(rdev
->sb_page
);
8943 struct md_rdev
*rdev2
;
8945 char b
[BDEVNAME_SIZE
];
8947 /* Check for change of roles in the active devices */
8948 rdev_for_each(rdev2
, mddev
) {
8949 if (test_bit(Faulty
, &rdev2
->flags
))
8952 /* Check if the roles changed */
8953 role
= le16_to_cpu(sb
->dev_roles
[rdev2
->desc_nr
]);
8954 if (role
!= rdev2
->raid_disk
) {
8956 if (rdev2
->raid_disk
== -1 && role
!= 0xffff) {
8957 rdev2
->saved_raid_disk
= role
;
8958 ret
= remove_and_add_spares(mddev
, rdev2
);
8959 pr_info("Activated spare: %s\n",
8960 bdevname(rdev2
->bdev
,b
));
8964 * We just want to do the minimum to mark the disk
8965 * as faulty. The recovery is performed by the
8966 * one who initiated the error.
8968 if ((role
== 0xfffe) || (role
== 0xfffd)) {
8969 md_error(mddev
, rdev2
);
8970 clear_bit(Blocked
, &rdev2
->flags
);
8975 /* recovery_cp changed */
8976 if (le64_to_cpu(sb
->resync_offset
) != mddev
->recovery_cp
)
8977 mddev
->recovery_cp
= le64_to_cpu(sb
->resync_offset
);
8979 /* Finally set the event to be up to date */
8980 mddev
->events
= le64_to_cpu(sb
->events
);
8983 static int read_rdev(struct mddev
*mddev
, struct md_rdev
*rdev
)
8986 struct page
*swapout
= rdev
->sb_page
;
8987 struct mdp_superblock_1
*sb
;
8989 /* Store the sb page of the rdev in the swapout temporary
8990 * variable in case we err in the future
8992 rdev
->sb_page
= NULL
;
8993 alloc_disk_sb(rdev
);
8994 ClearPageUptodate(rdev
->sb_page
);
8995 rdev
->sb_loaded
= 0;
8996 err
= super_types
[mddev
->major_version
].load_super(rdev
, NULL
, mddev
->minor_version
);
8999 pr_warn("%s: %d Could not reload rdev(%d) err: %d. Restoring old values\n",
9000 __func__
, __LINE__
, rdev
->desc_nr
, err
);
9001 put_page(rdev
->sb_page
);
9002 rdev
->sb_page
= swapout
;
9003 rdev
->sb_loaded
= 1;
9007 sb
= page_address(rdev
->sb_page
);
9008 /* Read the offset unconditionally, even if MD_FEATURE_RECOVERY_OFFSET
9012 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RECOVERY_OFFSET
))
9013 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
9015 /* The other node finished recovery, call spare_active to set
9016 * device In_sync and mddev->degraded
9018 if (rdev
->recovery_offset
== MaxSector
&&
9019 !test_bit(In_sync
, &rdev
->flags
) &&
9020 mddev
->pers
->spare_active(mddev
))
9021 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
9027 void md_reload_sb(struct mddev
*mddev
, int nr
)
9029 struct md_rdev
*rdev
;
9033 rdev_for_each_rcu(rdev
, mddev
) {
9034 if (rdev
->desc_nr
== nr
)
9038 if (!rdev
|| rdev
->desc_nr
!= nr
) {
9039 pr_warn("%s: %d Could not find rdev with nr %d\n", __func__
, __LINE__
, nr
);
9043 err
= read_rdev(mddev
, rdev
);
9047 check_sb_changes(mddev
, rdev
);
9049 /* Read all rdev's to update recovery_offset */
9050 rdev_for_each_rcu(rdev
, mddev
)
9051 read_rdev(mddev
, rdev
);
9053 EXPORT_SYMBOL(md_reload_sb
);
9058 * Searches all registered partitions for autorun RAID arrays
9062 static LIST_HEAD(all_detected_devices
);
9063 struct detected_devices_node
{
9064 struct list_head list
;
9068 void md_autodetect_dev(dev_t dev
)
9070 struct detected_devices_node
*node_detected_dev
;
9072 node_detected_dev
= kzalloc(sizeof(*node_detected_dev
), GFP_KERNEL
);
9073 if (node_detected_dev
) {
9074 node_detected_dev
->dev
= dev
;
9075 list_add_tail(&node_detected_dev
->list
, &all_detected_devices
);
9077 printk(KERN_CRIT
"md: md_autodetect_dev: kzalloc failed"
9078 ", skipping dev(%d,%d)\n", MAJOR(dev
), MINOR(dev
));
9082 static void autostart_arrays(int part
)
9084 struct md_rdev
*rdev
;
9085 struct detected_devices_node
*node_detected_dev
;
9087 int i_scanned
, i_passed
;
9092 printk(KERN_INFO
"md: Autodetecting RAID arrays.\n");
9094 while (!list_empty(&all_detected_devices
) && i_scanned
< INT_MAX
) {
9096 node_detected_dev
= list_entry(all_detected_devices
.next
,
9097 struct detected_devices_node
, list
);
9098 list_del(&node_detected_dev
->list
);
9099 dev
= node_detected_dev
->dev
;
9100 kfree(node_detected_dev
);
9101 rdev
= md_import_device(dev
,0, 90);
9105 if (test_bit(Faulty
, &rdev
->flags
))
9108 set_bit(AutoDetected
, &rdev
->flags
);
9109 list_add(&rdev
->same_set
, &pending_raid_disks
);
9113 printk(KERN_INFO
"md: Scanned %d and added %d devices.\n",
9114 i_scanned
, i_passed
);
9116 autorun_devices(part
);
9119 #endif /* !MODULE */
9121 static __exit
void md_exit(void)
9123 struct mddev
*mddev
;
9124 struct list_head
*tmp
;
9127 blk_unregister_region(MKDEV(MD_MAJOR
,0), 512);
9128 blk_unregister_region(MKDEV(mdp_major
,0), 1U << MINORBITS
);
9130 unregister_blkdev(MD_MAJOR
,"md");
9131 unregister_blkdev(mdp_major
, "mdp");
9132 unregister_reboot_notifier(&md_notifier
);
9133 unregister_sysctl_table(raid_table_header
);
9135 /* We cannot unload the modules while some process is
9136 * waiting for us in select() or poll() - wake them up
9139 while (waitqueue_active(&md_event_waiters
)) {
9140 /* not safe to leave yet */
9141 wake_up(&md_event_waiters
);
9145 remove_proc_entry("mdstat", NULL
);
9147 for_each_mddev(mddev
, tmp
) {
9148 export_array(mddev
);
9149 mddev
->hold_active
= 0;
9151 destroy_workqueue(md_misc_wq
);
9152 destroy_workqueue(md_wq
);
9155 subsys_initcall(md_init
);
9156 module_exit(md_exit
)
9158 static int get_ro(char *buffer
, struct kernel_param
*kp
)
9160 return sprintf(buffer
, "%d", start_readonly
);
9162 static int set_ro(const char *val
, struct kernel_param
*kp
)
9164 return kstrtouint(val
, 10, (unsigned int *)&start_readonly
);
9167 module_param_call(start_ro
, set_ro
, get_ro
, NULL
, S_IRUSR
|S_IWUSR
);
9168 module_param(start_dirty_degraded
, int, S_IRUGO
|S_IWUSR
);
9169 module_param_call(new_array
, add_named_array
, NULL
, NULL
, S_IWUSR
);
9171 MODULE_LICENSE("GPL");
9172 MODULE_DESCRIPTION("MD RAID framework");
9174 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);