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 (rdev
->badblocks
.count
== 0)
1739 /* Nothing to do for bad blocks*/ ;
1740 else if (sb
->bblog_offset
== 0)
1741 /* Cannot record bad blocks on this device */
1742 md_error(mddev
, rdev
);
1744 struct badblocks
*bb
= &rdev
->badblocks
;
1745 u64
*bbp
= (u64
*)page_address(rdev
->bb_page
);
1747 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_BAD_BLOCKS
);
1752 seq
= read_seqbegin(&bb
->lock
);
1754 memset(bbp
, 0xff, PAGE_SIZE
);
1756 for (i
= 0 ; i
< bb
->count
; i
++) {
1757 u64 internal_bb
= p
[i
];
1758 u64 store_bb
= ((BB_OFFSET(internal_bb
) << 10)
1759 | BB_LEN(internal_bb
));
1760 bbp
[i
] = cpu_to_le64(store_bb
);
1763 if (read_seqretry(&bb
->lock
, seq
))
1766 bb
->sector
= (rdev
->sb_start
+
1767 (int)le32_to_cpu(sb
->bblog_offset
));
1768 bb
->size
= le16_to_cpu(sb
->bblog_size
);
1773 rdev_for_each(rdev2
, mddev
)
1774 if (rdev2
->desc_nr
+1 > max_dev
)
1775 max_dev
= rdev2
->desc_nr
+1;
1777 if (max_dev
> le32_to_cpu(sb
->max_dev
)) {
1779 sb
->max_dev
= cpu_to_le32(max_dev
);
1780 rdev
->sb_size
= max_dev
* 2 + 256;
1781 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1782 if (rdev
->sb_size
& bmask
)
1783 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1785 max_dev
= le32_to_cpu(sb
->max_dev
);
1787 for (i
=0; i
<max_dev
;i
++)
1788 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1790 rdev_for_each(rdev2
, mddev
) {
1792 if (test_bit(Faulty
, &rdev2
->flags
))
1793 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1794 else if (test_bit(In_sync
, &rdev2
->flags
))
1795 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1796 else if (rdev2
->raid_disk
>= 0)
1797 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1799 sb
->dev_roles
[i
] = cpu_to_le16(0xffff);
1802 sb
->sb_csum
= calc_sb_1_csum(sb
);
1805 static unsigned long long
1806 super_1_rdev_size_change(struct md_rdev
*rdev
, sector_t num_sectors
)
1808 struct mdp_superblock_1
*sb
;
1809 sector_t max_sectors
;
1810 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1811 return 0; /* component must fit device */
1812 if (rdev
->data_offset
!= rdev
->new_data_offset
)
1813 return 0; /* too confusing */
1814 if (rdev
->sb_start
< rdev
->data_offset
) {
1815 /* minor versions 1 and 2; superblock before data */
1816 max_sectors
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1817 max_sectors
-= rdev
->data_offset
;
1818 if (!num_sectors
|| num_sectors
> max_sectors
)
1819 num_sectors
= max_sectors
;
1820 } else if (rdev
->mddev
->bitmap_info
.offset
) {
1821 /* minor version 0 with bitmap we can't move */
1824 /* minor version 0; superblock after data */
1826 sb_start
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) - 8*2;
1827 sb_start
&= ~(sector_t
)(4*2 - 1);
1828 max_sectors
= rdev
->sectors
+ sb_start
- rdev
->sb_start
;
1829 if (!num_sectors
|| num_sectors
> max_sectors
)
1830 num_sectors
= max_sectors
;
1831 rdev
->sb_start
= sb_start
;
1833 sb
= page_address(rdev
->sb_page
);
1834 sb
->data_size
= cpu_to_le64(num_sectors
);
1835 sb
->super_offset
= rdev
->sb_start
;
1836 sb
->sb_csum
= calc_sb_1_csum(sb
);
1837 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1839 md_super_wait(rdev
->mddev
);
1845 super_1_allow_new_offset(struct md_rdev
*rdev
,
1846 unsigned long long new_offset
)
1848 /* All necessary checks on new >= old have been done */
1849 struct bitmap
*bitmap
;
1850 if (new_offset
>= rdev
->data_offset
)
1853 /* with 1.0 metadata, there is no metadata to tread on
1854 * so we can always move back */
1855 if (rdev
->mddev
->minor_version
== 0)
1858 /* otherwise we must be sure not to step on
1859 * any metadata, so stay:
1860 * 36K beyond start of superblock
1861 * beyond end of badblocks
1862 * beyond write-intent bitmap
1864 if (rdev
->sb_start
+ (32+4)*2 > new_offset
)
1866 bitmap
= rdev
->mddev
->bitmap
;
1867 if (bitmap
&& !rdev
->mddev
->bitmap_info
.file
&&
1868 rdev
->sb_start
+ rdev
->mddev
->bitmap_info
.offset
+
1869 bitmap
->storage
.file_pages
* (PAGE_SIZE
>>9) > new_offset
)
1871 if (rdev
->badblocks
.sector
+ rdev
->badblocks
.size
> new_offset
)
1877 static struct super_type super_types
[] = {
1880 .owner
= THIS_MODULE
,
1881 .load_super
= super_90_load
,
1882 .validate_super
= super_90_validate
,
1883 .sync_super
= super_90_sync
,
1884 .rdev_size_change
= super_90_rdev_size_change
,
1885 .allow_new_offset
= super_90_allow_new_offset
,
1889 .owner
= THIS_MODULE
,
1890 .load_super
= super_1_load
,
1891 .validate_super
= super_1_validate
,
1892 .sync_super
= super_1_sync
,
1893 .rdev_size_change
= super_1_rdev_size_change
,
1894 .allow_new_offset
= super_1_allow_new_offset
,
1898 static void sync_super(struct mddev
*mddev
, struct md_rdev
*rdev
)
1900 if (mddev
->sync_super
) {
1901 mddev
->sync_super(mddev
, rdev
);
1905 BUG_ON(mddev
->major_version
>= ARRAY_SIZE(super_types
));
1907 super_types
[mddev
->major_version
].sync_super(mddev
, rdev
);
1910 static int match_mddev_units(struct mddev
*mddev1
, struct mddev
*mddev2
)
1912 struct md_rdev
*rdev
, *rdev2
;
1915 rdev_for_each_rcu(rdev
, mddev1
)
1916 rdev_for_each_rcu(rdev2
, mddev2
)
1917 if (rdev
->bdev
->bd_contains
==
1918 rdev2
->bdev
->bd_contains
) {
1926 static LIST_HEAD(pending_raid_disks
);
1929 * Try to register data integrity profile for an mddev
1931 * This is called when an array is started and after a disk has been kicked
1932 * from the array. It only succeeds if all working and active component devices
1933 * are integrity capable with matching profiles.
1935 int md_integrity_register(struct mddev
*mddev
)
1937 struct md_rdev
*rdev
, *reference
= NULL
;
1939 if (list_empty(&mddev
->disks
))
1940 return 0; /* nothing to do */
1941 if (!mddev
->gendisk
|| blk_get_integrity(mddev
->gendisk
))
1942 return 0; /* shouldn't register, or already is */
1943 rdev_for_each(rdev
, mddev
) {
1944 /* skip spares and non-functional disks */
1945 if (test_bit(Faulty
, &rdev
->flags
))
1947 if (rdev
->raid_disk
< 0)
1950 /* Use the first rdev as the reference */
1954 /* does this rdev's profile match the reference profile? */
1955 if (blk_integrity_compare(reference
->bdev
->bd_disk
,
1956 rdev
->bdev
->bd_disk
) < 0)
1959 if (!reference
|| !bdev_get_integrity(reference
->bdev
))
1962 * All component devices are integrity capable and have matching
1963 * profiles, register the common profile for the md device.
1965 if (blk_integrity_register(mddev
->gendisk
,
1966 bdev_get_integrity(reference
->bdev
)) != 0) {
1967 printk(KERN_ERR
"md: failed to register integrity for %s\n",
1971 printk(KERN_NOTICE
"md: data integrity enabled on %s\n", mdname(mddev
));
1972 if (bioset_integrity_create(mddev
->bio_set
, BIO_POOL_SIZE
)) {
1973 printk(KERN_ERR
"md: failed to create integrity pool for %s\n",
1979 EXPORT_SYMBOL(md_integrity_register
);
1981 /* Disable data integrity if non-capable/non-matching disk is being added */
1982 void md_integrity_add_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
1984 struct blk_integrity
*bi_rdev
;
1985 struct blk_integrity
*bi_mddev
;
1987 if (!mddev
->gendisk
)
1990 bi_rdev
= bdev_get_integrity(rdev
->bdev
);
1991 bi_mddev
= blk_get_integrity(mddev
->gendisk
);
1993 if (!bi_mddev
) /* nothing to do */
1995 if (rdev
->raid_disk
< 0) /* skip spares */
1997 if (bi_rdev
&& blk_integrity_compare(mddev
->gendisk
,
1998 rdev
->bdev
->bd_disk
) >= 0)
2000 printk(KERN_NOTICE
"disabling data integrity on %s\n", mdname(mddev
));
2001 blk_integrity_unregister(mddev
->gendisk
);
2003 EXPORT_SYMBOL(md_integrity_add_rdev
);
2005 static int bind_rdev_to_array(struct md_rdev
*rdev
, struct mddev
*mddev
)
2007 char b
[BDEVNAME_SIZE
];
2011 /* prevent duplicates */
2012 if (find_rdev(mddev
, rdev
->bdev
->bd_dev
))
2015 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2016 if (rdev
->sectors
&& (mddev
->dev_sectors
== 0 ||
2017 rdev
->sectors
< mddev
->dev_sectors
)) {
2019 /* Cannot change size, so fail
2020 * If mddev->level <= 0, then we don't care
2021 * about aligning sizes (e.g. linear)
2023 if (mddev
->level
> 0)
2026 mddev
->dev_sectors
= rdev
->sectors
;
2029 /* Verify rdev->desc_nr is unique.
2030 * If it is -1, assign a free number, else
2031 * check number is not in use
2034 if (rdev
->desc_nr
< 0) {
2037 choice
= mddev
->raid_disks
;
2038 while (md_find_rdev_nr_rcu(mddev
, choice
))
2040 rdev
->desc_nr
= choice
;
2042 if (md_find_rdev_nr_rcu(mddev
, rdev
->desc_nr
)) {
2048 if (mddev
->max_disks
&& rdev
->desc_nr
>= mddev
->max_disks
) {
2049 printk(KERN_WARNING
"md: %s: array is limited to %d devices\n",
2050 mdname(mddev
), mddev
->max_disks
);
2053 bdevname(rdev
->bdev
,b
);
2054 strreplace(b
, '/', '!');
2056 rdev
->mddev
= mddev
;
2057 printk(KERN_INFO
"md: bind<%s>\n", b
);
2059 if ((err
= kobject_add(&rdev
->kobj
, &mddev
->kobj
, "dev-%s", b
)))
2062 ko
= &part_to_dev(rdev
->bdev
->bd_part
)->kobj
;
2063 if (sysfs_create_link(&rdev
->kobj
, ko
, "block"))
2064 /* failure here is OK */;
2065 rdev
->sysfs_state
= sysfs_get_dirent_safe(rdev
->kobj
.sd
, "state");
2067 list_add_rcu(&rdev
->same_set
, &mddev
->disks
);
2068 bd_link_disk_holder(rdev
->bdev
, mddev
->gendisk
);
2070 /* May as well allow recovery to be retried once */
2071 mddev
->recovery_disabled
++;
2076 printk(KERN_WARNING
"md: failed to register dev-%s for %s\n",
2081 static void md_delayed_delete(struct work_struct
*ws
)
2083 struct md_rdev
*rdev
= container_of(ws
, struct md_rdev
, del_work
);
2084 kobject_del(&rdev
->kobj
);
2085 kobject_put(&rdev
->kobj
);
2088 static void unbind_rdev_from_array(struct md_rdev
*rdev
)
2090 char b
[BDEVNAME_SIZE
];
2092 bd_unlink_disk_holder(rdev
->bdev
, rdev
->mddev
->gendisk
);
2093 list_del_rcu(&rdev
->same_set
);
2094 printk(KERN_INFO
"md: unbind<%s>\n", bdevname(rdev
->bdev
,b
));
2096 sysfs_remove_link(&rdev
->kobj
, "block");
2097 sysfs_put(rdev
->sysfs_state
);
2098 rdev
->sysfs_state
= NULL
;
2099 rdev
->badblocks
.count
= 0;
2100 /* We need to delay this, otherwise we can deadlock when
2101 * writing to 'remove' to "dev/state". We also need
2102 * to delay it due to rcu usage.
2105 INIT_WORK(&rdev
->del_work
, md_delayed_delete
);
2106 kobject_get(&rdev
->kobj
);
2107 queue_work(md_misc_wq
, &rdev
->del_work
);
2111 * prevent the device from being mounted, repartitioned or
2112 * otherwise reused by a RAID array (or any other kernel
2113 * subsystem), by bd_claiming the device.
2115 static int lock_rdev(struct md_rdev
*rdev
, dev_t dev
, int shared
)
2118 struct block_device
*bdev
;
2119 char b
[BDEVNAME_SIZE
];
2121 bdev
= blkdev_get_by_dev(dev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
,
2122 shared
? (struct md_rdev
*)lock_rdev
: rdev
);
2124 printk(KERN_ERR
"md: could not open %s.\n",
2125 __bdevname(dev
, b
));
2126 return PTR_ERR(bdev
);
2132 static void unlock_rdev(struct md_rdev
*rdev
)
2134 struct block_device
*bdev
= rdev
->bdev
;
2136 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
);
2139 void md_autodetect_dev(dev_t dev
);
2141 static void export_rdev(struct md_rdev
*rdev
)
2143 char b
[BDEVNAME_SIZE
];
2145 printk(KERN_INFO
"md: export_rdev(%s)\n",
2146 bdevname(rdev
->bdev
,b
));
2147 md_rdev_clear(rdev
);
2149 if (test_bit(AutoDetected
, &rdev
->flags
))
2150 md_autodetect_dev(rdev
->bdev
->bd_dev
);
2153 kobject_put(&rdev
->kobj
);
2156 void md_kick_rdev_from_array(struct md_rdev
*rdev
)
2158 unbind_rdev_from_array(rdev
);
2161 EXPORT_SYMBOL_GPL(md_kick_rdev_from_array
);
2163 static void export_array(struct mddev
*mddev
)
2165 struct md_rdev
*rdev
;
2167 while (!list_empty(&mddev
->disks
)) {
2168 rdev
= list_first_entry(&mddev
->disks
, struct md_rdev
,
2170 md_kick_rdev_from_array(rdev
);
2172 mddev
->raid_disks
= 0;
2173 mddev
->major_version
= 0;
2176 static void sync_sbs(struct mddev
*mddev
, int nospares
)
2178 /* Update each superblock (in-memory image), but
2179 * if we are allowed to, skip spares which already
2180 * have the right event counter, or have one earlier
2181 * (which would mean they aren't being marked as dirty
2182 * with the rest of the array)
2184 struct md_rdev
*rdev
;
2185 rdev_for_each(rdev
, mddev
) {
2186 if (rdev
->sb_events
== mddev
->events
||
2188 rdev
->raid_disk
< 0 &&
2189 rdev
->sb_events
+1 == mddev
->events
)) {
2190 /* Don't update this superblock */
2191 rdev
->sb_loaded
= 2;
2193 sync_super(mddev
, rdev
);
2194 rdev
->sb_loaded
= 1;
2199 void md_update_sb(struct mddev
*mddev
, int force_change
)
2201 struct md_rdev
*rdev
;
2204 int any_badblocks_changed
= 0;
2208 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
2212 /* First make sure individual recovery_offsets are correct */
2213 rdev_for_each(rdev
, mddev
) {
2214 if (rdev
->raid_disk
>= 0 &&
2215 mddev
->delta_disks
>= 0 &&
2216 !test_bit(In_sync
, &rdev
->flags
) &&
2217 mddev
->curr_resync_completed
> rdev
->recovery_offset
)
2218 rdev
->recovery_offset
= mddev
->curr_resync_completed
;
2221 if (!mddev
->persistent
) {
2222 clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
2223 clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
2224 if (!mddev
->external
) {
2225 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2226 rdev_for_each(rdev
, mddev
) {
2227 if (rdev
->badblocks
.changed
) {
2228 rdev
->badblocks
.changed
= 0;
2229 md_ack_all_badblocks(&rdev
->badblocks
);
2230 md_error(mddev
, rdev
);
2232 clear_bit(Blocked
, &rdev
->flags
);
2233 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2234 wake_up(&rdev
->blocked_wait
);
2237 wake_up(&mddev
->sb_wait
);
2241 spin_lock(&mddev
->lock
);
2243 mddev
->utime
= get_seconds();
2245 if (test_and_clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
))
2247 if (test_and_clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
2248 /* just a clean<-> dirty transition, possibly leave spares alone,
2249 * though if events isn't the right even/odd, we will have to do
2255 if (mddev
->degraded
)
2256 /* If the array is degraded, then skipping spares is both
2257 * dangerous and fairly pointless.
2258 * Dangerous because a device that was removed from the array
2259 * might have a event_count that still looks up-to-date,
2260 * so it can be re-added without a resync.
2261 * Pointless because if there are any spares to skip,
2262 * then a recovery will happen and soon that array won't
2263 * be degraded any more and the spare can go back to sleep then.
2267 sync_req
= mddev
->in_sync
;
2269 /* If this is just a dirty<->clean transition, and the array is clean
2270 * and 'events' is odd, we can roll back to the previous clean state */
2272 && (mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
2273 && mddev
->can_decrease_events
2274 && mddev
->events
!= 1) {
2276 mddev
->can_decrease_events
= 0;
2278 /* otherwise we have to go forward and ... */
2280 mddev
->can_decrease_events
= nospares
;
2284 * This 64-bit counter should never wrap.
2285 * Either we are in around ~1 trillion A.C., assuming
2286 * 1 reboot per second, or we have a bug...
2288 WARN_ON(mddev
->events
== 0);
2290 rdev_for_each(rdev
, mddev
) {
2291 if (rdev
->badblocks
.changed
)
2292 any_badblocks_changed
++;
2293 if (test_bit(Faulty
, &rdev
->flags
))
2294 set_bit(FaultRecorded
, &rdev
->flags
);
2297 sync_sbs(mddev
, nospares
);
2298 spin_unlock(&mddev
->lock
);
2300 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2301 mdname(mddev
), mddev
->in_sync
);
2303 bitmap_update_sb(mddev
->bitmap
);
2304 rdev_for_each(rdev
, mddev
) {
2305 char b
[BDEVNAME_SIZE
];
2307 if (rdev
->sb_loaded
!= 1)
2308 continue; /* no noise on spare devices */
2310 if (!test_bit(Faulty
, &rdev
->flags
)) {
2311 md_super_write(mddev
,rdev
,
2312 rdev
->sb_start
, rdev
->sb_size
,
2314 pr_debug("md: (write) %s's sb offset: %llu\n",
2315 bdevname(rdev
->bdev
, b
),
2316 (unsigned long long)rdev
->sb_start
);
2317 rdev
->sb_events
= mddev
->events
;
2318 if (rdev
->badblocks
.size
) {
2319 md_super_write(mddev
, rdev
,
2320 rdev
->badblocks
.sector
,
2321 rdev
->badblocks
.size
<< 9,
2323 rdev
->badblocks
.size
= 0;
2327 pr_debug("md: %s (skipping faulty)\n",
2328 bdevname(rdev
->bdev
, b
));
2330 if (mddev
->level
== LEVEL_MULTIPATH
)
2331 /* only need to write one superblock... */
2334 md_super_wait(mddev
);
2335 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2337 spin_lock(&mddev
->lock
);
2338 if (mddev
->in_sync
!= sync_req
||
2339 test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
2340 /* have to write it out again */
2341 spin_unlock(&mddev
->lock
);
2344 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2345 spin_unlock(&mddev
->lock
);
2346 wake_up(&mddev
->sb_wait
);
2347 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
2348 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
2350 rdev_for_each(rdev
, mddev
) {
2351 if (test_and_clear_bit(FaultRecorded
, &rdev
->flags
))
2352 clear_bit(Blocked
, &rdev
->flags
);
2354 if (any_badblocks_changed
)
2355 md_ack_all_badblocks(&rdev
->badblocks
);
2356 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2357 wake_up(&rdev
->blocked_wait
);
2360 EXPORT_SYMBOL(md_update_sb
);
2362 static int add_bound_rdev(struct md_rdev
*rdev
)
2364 struct mddev
*mddev
= rdev
->mddev
;
2367 if (!mddev
->pers
->hot_remove_disk
) {
2368 /* If there is hot_add_disk but no hot_remove_disk
2369 * then added disks for geometry changes,
2370 * and should be added immediately.
2372 super_types
[mddev
->major_version
].
2373 validate_super(mddev
, rdev
);
2374 err
= mddev
->pers
->hot_add_disk(mddev
, rdev
);
2376 unbind_rdev_from_array(rdev
);
2381 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2383 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
2384 if (mddev
->degraded
)
2385 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
2386 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
2387 md_new_event(mddev
);
2388 md_wakeup_thread(mddev
->thread
);
2392 /* words written to sysfs files may, or may not, be \n terminated.
2393 * We want to accept with case. For this we use cmd_match.
2395 static int cmd_match(const char *cmd
, const char *str
)
2397 /* See if cmd, written into a sysfs file, matches
2398 * str. They must either be the same, or cmd can
2399 * have a trailing newline
2401 while (*cmd
&& *str
&& *cmd
== *str
) {
2412 struct rdev_sysfs_entry
{
2413 struct attribute attr
;
2414 ssize_t (*show
)(struct md_rdev
*, char *);
2415 ssize_t (*store
)(struct md_rdev
*, const char *, size_t);
2419 state_show(struct md_rdev
*rdev
, char *page
)
2423 unsigned long flags
= ACCESS_ONCE(rdev
->flags
);
2425 if (test_bit(Faulty
, &flags
) ||
2426 rdev
->badblocks
.unacked_exist
) {
2427 len
+= sprintf(page
+len
, "%sfaulty",sep
);
2430 if (test_bit(In_sync
, &flags
)) {
2431 len
+= sprintf(page
+len
, "%sin_sync",sep
);
2434 if (test_bit(WriteMostly
, &flags
)) {
2435 len
+= sprintf(page
+len
, "%swrite_mostly",sep
);
2438 if (test_bit(Blocked
, &flags
) ||
2439 (rdev
->badblocks
.unacked_exist
2440 && !test_bit(Faulty
, &flags
))) {
2441 len
+= sprintf(page
+len
, "%sblocked", sep
);
2444 if (!test_bit(Faulty
, &flags
) &&
2445 !test_bit(In_sync
, &flags
)) {
2446 len
+= sprintf(page
+len
, "%sspare", sep
);
2449 if (test_bit(WriteErrorSeen
, &flags
)) {
2450 len
+= sprintf(page
+len
, "%swrite_error", sep
);
2453 if (test_bit(WantReplacement
, &flags
)) {
2454 len
+= sprintf(page
+len
, "%swant_replacement", sep
);
2457 if (test_bit(Replacement
, &flags
)) {
2458 len
+= sprintf(page
+len
, "%sreplacement", sep
);
2462 return len
+sprintf(page
+len
, "\n");
2466 state_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2469 * faulty - simulates an error
2470 * remove - disconnects the device
2471 * writemostly - sets write_mostly
2472 * -writemostly - clears write_mostly
2473 * blocked - sets the Blocked flags
2474 * -blocked - clears the Blocked and possibly simulates an error
2475 * insync - sets Insync providing device isn't active
2476 * -insync - clear Insync for a device with a slot assigned,
2477 * so that it gets rebuilt based on bitmap
2478 * write_error - sets WriteErrorSeen
2479 * -write_error - clears WriteErrorSeen
2482 if (cmd_match(buf
, "faulty") && rdev
->mddev
->pers
) {
2483 md_error(rdev
->mddev
, rdev
);
2484 if (test_bit(Faulty
, &rdev
->flags
))
2488 } else if (cmd_match(buf
, "remove")) {
2489 if (rdev
->raid_disk
>= 0)
2492 struct mddev
*mddev
= rdev
->mddev
;
2493 if (mddev_is_clustered(mddev
))
2494 md_cluster_ops
->remove_disk(mddev
, rdev
);
2495 md_kick_rdev_from_array(rdev
);
2496 if (mddev_is_clustered(mddev
))
2497 md_cluster_ops
->metadata_update_start(mddev
);
2499 md_update_sb(mddev
, 1);
2500 md_new_event(mddev
);
2501 if (mddev_is_clustered(mddev
))
2502 md_cluster_ops
->metadata_update_finish(mddev
);
2505 } else if (cmd_match(buf
, "writemostly")) {
2506 set_bit(WriteMostly
, &rdev
->flags
);
2508 } else if (cmd_match(buf
, "-writemostly")) {
2509 clear_bit(WriteMostly
, &rdev
->flags
);
2511 } else if (cmd_match(buf
, "blocked")) {
2512 set_bit(Blocked
, &rdev
->flags
);
2514 } else if (cmd_match(buf
, "-blocked")) {
2515 if (!test_bit(Faulty
, &rdev
->flags
) &&
2516 rdev
->badblocks
.unacked_exist
) {
2517 /* metadata handler doesn't understand badblocks,
2518 * so we need to fail the device
2520 md_error(rdev
->mddev
, rdev
);
2522 clear_bit(Blocked
, &rdev
->flags
);
2523 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2524 wake_up(&rdev
->blocked_wait
);
2525 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2526 md_wakeup_thread(rdev
->mddev
->thread
);
2529 } else if (cmd_match(buf
, "insync") && rdev
->raid_disk
== -1) {
2530 set_bit(In_sync
, &rdev
->flags
);
2532 } else if (cmd_match(buf
, "-insync") && rdev
->raid_disk
>= 0) {
2533 if (rdev
->mddev
->pers
== NULL
) {
2534 clear_bit(In_sync
, &rdev
->flags
);
2535 rdev
->saved_raid_disk
= rdev
->raid_disk
;
2536 rdev
->raid_disk
= -1;
2539 } else if (cmd_match(buf
, "write_error")) {
2540 set_bit(WriteErrorSeen
, &rdev
->flags
);
2542 } else if (cmd_match(buf
, "-write_error")) {
2543 clear_bit(WriteErrorSeen
, &rdev
->flags
);
2545 } else if (cmd_match(buf
, "want_replacement")) {
2546 /* Any non-spare device that is not a replacement can
2547 * become want_replacement at any time, but we then need to
2548 * check if recovery is needed.
2550 if (rdev
->raid_disk
>= 0 &&
2551 !test_bit(Replacement
, &rdev
->flags
))
2552 set_bit(WantReplacement
, &rdev
->flags
);
2553 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2554 md_wakeup_thread(rdev
->mddev
->thread
);
2556 } else if (cmd_match(buf
, "-want_replacement")) {
2557 /* Clearing 'want_replacement' is always allowed.
2558 * Once replacements starts it is too late though.
2561 clear_bit(WantReplacement
, &rdev
->flags
);
2562 } else if (cmd_match(buf
, "replacement")) {
2563 /* Can only set a device as a replacement when array has not
2564 * yet been started. Once running, replacement is automatic
2565 * from spares, or by assigning 'slot'.
2567 if (rdev
->mddev
->pers
)
2570 set_bit(Replacement
, &rdev
->flags
);
2573 } else if (cmd_match(buf
, "-replacement")) {
2574 /* Similarly, can only clear Replacement before start */
2575 if (rdev
->mddev
->pers
)
2578 clear_bit(Replacement
, &rdev
->flags
);
2581 } else if (cmd_match(buf
, "re-add")) {
2582 if (test_bit(Faulty
, &rdev
->flags
) && (rdev
->raid_disk
== -1)) {
2583 /* clear_bit is performed _after_ all the devices
2584 * have their local Faulty bit cleared. If any writes
2585 * happen in the meantime in the local node, they
2586 * will land in the local bitmap, which will be synced
2587 * by this node eventually
2589 if (!mddev_is_clustered(rdev
->mddev
) ||
2590 (err
= md_cluster_ops
->gather_bitmaps(rdev
)) == 0) {
2591 clear_bit(Faulty
, &rdev
->flags
);
2592 err
= add_bound_rdev(rdev
);
2598 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2599 return err
? err
: len
;
2601 static struct rdev_sysfs_entry rdev_state
=
2602 __ATTR_PREALLOC(state
, S_IRUGO
|S_IWUSR
, state_show
, state_store
);
2605 errors_show(struct md_rdev
*rdev
, char *page
)
2607 return sprintf(page
, "%d\n", atomic_read(&rdev
->corrected_errors
));
2611 errors_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2616 rv
= kstrtouint(buf
, 10, &n
);
2619 atomic_set(&rdev
->corrected_errors
, n
);
2622 static struct rdev_sysfs_entry rdev_errors
=
2623 __ATTR(errors
, S_IRUGO
|S_IWUSR
, errors_show
, errors_store
);
2626 slot_show(struct md_rdev
*rdev
, char *page
)
2628 if (rdev
->raid_disk
< 0)
2629 return sprintf(page
, "none\n");
2631 return sprintf(page
, "%d\n", rdev
->raid_disk
);
2635 slot_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2640 if (strncmp(buf
, "none", 4)==0)
2643 err
= kstrtouint(buf
, 10, (unsigned int *)&slot
);
2647 if (rdev
->mddev
->pers
&& slot
== -1) {
2648 /* Setting 'slot' on an active array requires also
2649 * updating the 'rd%d' link, and communicating
2650 * with the personality with ->hot_*_disk.
2651 * For now we only support removing
2652 * failed/spare devices. This normally happens automatically,
2653 * but not when the metadata is externally managed.
2655 if (rdev
->raid_disk
== -1)
2657 /* personality does all needed checks */
2658 if (rdev
->mddev
->pers
->hot_remove_disk
== NULL
)
2660 clear_bit(Blocked
, &rdev
->flags
);
2661 remove_and_add_spares(rdev
->mddev
, rdev
);
2662 if (rdev
->raid_disk
>= 0)
2664 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2665 md_wakeup_thread(rdev
->mddev
->thread
);
2666 } else if (rdev
->mddev
->pers
) {
2667 /* Activating a spare .. or possibly reactivating
2668 * if we ever get bitmaps working here.
2671 if (rdev
->raid_disk
!= -1)
2674 if (test_bit(MD_RECOVERY_RUNNING
, &rdev
->mddev
->recovery
))
2677 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
2680 if (slot
>= rdev
->mddev
->raid_disks
&&
2681 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
2684 rdev
->raid_disk
= slot
;
2685 if (test_bit(In_sync
, &rdev
->flags
))
2686 rdev
->saved_raid_disk
= slot
;
2688 rdev
->saved_raid_disk
= -1;
2689 clear_bit(In_sync
, &rdev
->flags
);
2690 clear_bit(Bitmap_sync
, &rdev
->flags
);
2691 err
= rdev
->mddev
->pers
->
2692 hot_add_disk(rdev
->mddev
, rdev
);
2694 rdev
->raid_disk
= -1;
2697 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2698 if (sysfs_link_rdev(rdev
->mddev
, rdev
))
2699 /* failure here is OK */;
2700 /* don't wakeup anyone, leave that to userspace. */
2702 if (slot
>= rdev
->mddev
->raid_disks
&&
2703 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
2705 rdev
->raid_disk
= slot
;
2706 /* assume it is working */
2707 clear_bit(Faulty
, &rdev
->flags
);
2708 clear_bit(WriteMostly
, &rdev
->flags
);
2709 set_bit(In_sync
, &rdev
->flags
);
2710 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2715 static struct rdev_sysfs_entry rdev_slot
=
2716 __ATTR(slot
, S_IRUGO
|S_IWUSR
, slot_show
, slot_store
);
2719 offset_show(struct md_rdev
*rdev
, char *page
)
2721 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->data_offset
);
2725 offset_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2727 unsigned long long offset
;
2728 if (kstrtoull(buf
, 10, &offset
) < 0)
2730 if (rdev
->mddev
->pers
&& rdev
->raid_disk
>= 0)
2732 if (rdev
->sectors
&& rdev
->mddev
->external
)
2733 /* Must set offset before size, so overlap checks
2736 rdev
->data_offset
= offset
;
2737 rdev
->new_data_offset
= offset
;
2741 static struct rdev_sysfs_entry rdev_offset
=
2742 __ATTR(offset
, S_IRUGO
|S_IWUSR
, offset_show
, offset_store
);
2744 static ssize_t
new_offset_show(struct md_rdev
*rdev
, char *page
)
2746 return sprintf(page
, "%llu\n",
2747 (unsigned long long)rdev
->new_data_offset
);
2750 static ssize_t
new_offset_store(struct md_rdev
*rdev
,
2751 const char *buf
, size_t len
)
2753 unsigned long long new_offset
;
2754 struct mddev
*mddev
= rdev
->mddev
;
2756 if (kstrtoull(buf
, 10, &new_offset
) < 0)
2759 if (mddev
->sync_thread
||
2760 test_bit(MD_RECOVERY_RUNNING
,&mddev
->recovery
))
2762 if (new_offset
== rdev
->data_offset
)
2763 /* reset is always permitted */
2765 else if (new_offset
> rdev
->data_offset
) {
2766 /* must not push array size beyond rdev_sectors */
2767 if (new_offset
- rdev
->data_offset
2768 + mddev
->dev_sectors
> rdev
->sectors
)
2771 /* Metadata worries about other space details. */
2773 /* decreasing the offset is inconsistent with a backwards
2776 if (new_offset
< rdev
->data_offset
&&
2777 mddev
->reshape_backwards
)
2779 /* Increasing offset is inconsistent with forwards
2780 * reshape. reshape_direction should be set to
2781 * 'backwards' first.
2783 if (new_offset
> rdev
->data_offset
&&
2784 !mddev
->reshape_backwards
)
2787 if (mddev
->pers
&& mddev
->persistent
&&
2788 !super_types
[mddev
->major_version
]
2789 .allow_new_offset(rdev
, new_offset
))
2791 rdev
->new_data_offset
= new_offset
;
2792 if (new_offset
> rdev
->data_offset
)
2793 mddev
->reshape_backwards
= 1;
2794 else if (new_offset
< rdev
->data_offset
)
2795 mddev
->reshape_backwards
= 0;
2799 static struct rdev_sysfs_entry rdev_new_offset
=
2800 __ATTR(new_offset
, S_IRUGO
|S_IWUSR
, new_offset_show
, new_offset_store
);
2803 rdev_size_show(struct md_rdev
*rdev
, char *page
)
2805 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->sectors
/ 2);
2808 static int overlaps(sector_t s1
, sector_t l1
, sector_t s2
, sector_t l2
)
2810 /* check if two start/length pairs overlap */
2818 static int strict_blocks_to_sectors(const char *buf
, sector_t
*sectors
)
2820 unsigned long long blocks
;
2823 if (kstrtoull(buf
, 10, &blocks
) < 0)
2826 if (blocks
& 1ULL << (8 * sizeof(blocks
) - 1))
2827 return -EINVAL
; /* sector conversion overflow */
2830 if (new != blocks
* 2)
2831 return -EINVAL
; /* unsigned long long to sector_t overflow */
2838 rdev_size_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2840 struct mddev
*my_mddev
= rdev
->mddev
;
2841 sector_t oldsectors
= rdev
->sectors
;
2844 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
2846 if (rdev
->data_offset
!= rdev
->new_data_offset
)
2847 return -EINVAL
; /* too confusing */
2848 if (my_mddev
->pers
&& rdev
->raid_disk
>= 0) {
2849 if (my_mddev
->persistent
) {
2850 sectors
= super_types
[my_mddev
->major_version
].
2851 rdev_size_change(rdev
, sectors
);
2854 } else if (!sectors
)
2855 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) -
2857 if (!my_mddev
->pers
->resize
)
2858 /* Cannot change size for RAID0 or Linear etc */
2861 if (sectors
< my_mddev
->dev_sectors
)
2862 return -EINVAL
; /* component must fit device */
2864 rdev
->sectors
= sectors
;
2865 if (sectors
> oldsectors
&& my_mddev
->external
) {
2866 /* Need to check that all other rdevs with the same
2867 * ->bdev do not overlap. 'rcu' is sufficient to walk
2868 * the rdev lists safely.
2869 * This check does not provide a hard guarantee, it
2870 * just helps avoid dangerous mistakes.
2872 struct mddev
*mddev
;
2874 struct list_head
*tmp
;
2877 for_each_mddev(mddev
, tmp
) {
2878 struct md_rdev
*rdev2
;
2880 rdev_for_each(rdev2
, mddev
)
2881 if (rdev
->bdev
== rdev2
->bdev
&&
2883 overlaps(rdev
->data_offset
, rdev
->sectors
,
2896 /* Someone else could have slipped in a size
2897 * change here, but doing so is just silly.
2898 * We put oldsectors back because we *know* it is
2899 * safe, and trust userspace not to race with
2902 rdev
->sectors
= oldsectors
;
2909 static struct rdev_sysfs_entry rdev_size
=
2910 __ATTR(size
, S_IRUGO
|S_IWUSR
, rdev_size_show
, rdev_size_store
);
2912 static ssize_t
recovery_start_show(struct md_rdev
*rdev
, char *page
)
2914 unsigned long long recovery_start
= rdev
->recovery_offset
;
2916 if (test_bit(In_sync
, &rdev
->flags
) ||
2917 recovery_start
== MaxSector
)
2918 return sprintf(page
, "none\n");
2920 return sprintf(page
, "%llu\n", recovery_start
);
2923 static ssize_t
recovery_start_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2925 unsigned long long recovery_start
;
2927 if (cmd_match(buf
, "none"))
2928 recovery_start
= MaxSector
;
2929 else if (kstrtoull(buf
, 10, &recovery_start
))
2932 if (rdev
->mddev
->pers
&&
2933 rdev
->raid_disk
>= 0)
2936 rdev
->recovery_offset
= recovery_start
;
2937 if (recovery_start
== MaxSector
)
2938 set_bit(In_sync
, &rdev
->flags
);
2940 clear_bit(In_sync
, &rdev
->flags
);
2944 static struct rdev_sysfs_entry rdev_recovery_start
=
2945 __ATTR(recovery_start
, S_IRUGO
|S_IWUSR
, recovery_start_show
, recovery_start_store
);
2948 badblocks_show(struct badblocks
*bb
, char *page
, int unack
);
2950 badblocks_store(struct badblocks
*bb
, const char *page
, size_t len
, int unack
);
2952 static ssize_t
bb_show(struct md_rdev
*rdev
, char *page
)
2954 return badblocks_show(&rdev
->badblocks
, page
, 0);
2956 static ssize_t
bb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
2958 int rv
= badblocks_store(&rdev
->badblocks
, page
, len
, 0);
2959 /* Maybe that ack was all we needed */
2960 if (test_and_clear_bit(BlockedBadBlocks
, &rdev
->flags
))
2961 wake_up(&rdev
->blocked_wait
);
2964 static struct rdev_sysfs_entry rdev_bad_blocks
=
2965 __ATTR(bad_blocks
, S_IRUGO
|S_IWUSR
, bb_show
, bb_store
);
2967 static ssize_t
ubb_show(struct md_rdev
*rdev
, char *page
)
2969 return badblocks_show(&rdev
->badblocks
, page
, 1);
2971 static ssize_t
ubb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
2973 return badblocks_store(&rdev
->badblocks
, page
, len
, 1);
2975 static struct rdev_sysfs_entry rdev_unack_bad_blocks
=
2976 __ATTR(unacknowledged_bad_blocks
, S_IRUGO
|S_IWUSR
, ubb_show
, ubb_store
);
2978 static struct attribute
*rdev_default_attrs
[] = {
2983 &rdev_new_offset
.attr
,
2985 &rdev_recovery_start
.attr
,
2986 &rdev_bad_blocks
.attr
,
2987 &rdev_unack_bad_blocks
.attr
,
2991 rdev_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
2993 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
2994 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
3000 return entry
->show(rdev
, page
);
3004 rdev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
3005 const char *page
, size_t length
)
3007 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
3008 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
3010 struct mddev
*mddev
= rdev
->mddev
;
3014 if (!capable(CAP_SYS_ADMIN
))
3016 rv
= mddev
? mddev_lock(mddev
): -EBUSY
;
3018 if (rdev
->mddev
== NULL
)
3021 rv
= entry
->store(rdev
, page
, length
);
3022 mddev_unlock(mddev
);
3027 static void rdev_free(struct kobject
*ko
)
3029 struct md_rdev
*rdev
= container_of(ko
, struct md_rdev
, kobj
);
3032 static const struct sysfs_ops rdev_sysfs_ops
= {
3033 .show
= rdev_attr_show
,
3034 .store
= rdev_attr_store
,
3036 static struct kobj_type rdev_ktype
= {
3037 .release
= rdev_free
,
3038 .sysfs_ops
= &rdev_sysfs_ops
,
3039 .default_attrs
= rdev_default_attrs
,
3042 int md_rdev_init(struct md_rdev
*rdev
)
3045 rdev
->saved_raid_disk
= -1;
3046 rdev
->raid_disk
= -1;
3048 rdev
->data_offset
= 0;
3049 rdev
->new_data_offset
= 0;
3050 rdev
->sb_events
= 0;
3051 rdev
->last_read_error
.tv_sec
= 0;
3052 rdev
->last_read_error
.tv_nsec
= 0;
3053 rdev
->sb_loaded
= 0;
3054 rdev
->bb_page
= NULL
;
3055 atomic_set(&rdev
->nr_pending
, 0);
3056 atomic_set(&rdev
->read_errors
, 0);
3057 atomic_set(&rdev
->corrected_errors
, 0);
3059 INIT_LIST_HEAD(&rdev
->same_set
);
3060 init_waitqueue_head(&rdev
->blocked_wait
);
3062 /* Add space to store bad block list.
3063 * This reserves the space even on arrays where it cannot
3064 * be used - I wonder if that matters
3066 rdev
->badblocks
.count
= 0;
3067 rdev
->badblocks
.shift
= -1; /* disabled until explicitly enabled */
3068 rdev
->badblocks
.page
= kmalloc(PAGE_SIZE
, GFP_KERNEL
);
3069 seqlock_init(&rdev
->badblocks
.lock
);
3070 if (rdev
->badblocks
.page
== NULL
)
3075 EXPORT_SYMBOL_GPL(md_rdev_init
);
3077 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3079 * mark the device faulty if:
3081 * - the device is nonexistent (zero size)
3082 * - the device has no valid superblock
3084 * a faulty rdev _never_ has rdev->sb set.
3086 static struct md_rdev
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
3088 char b
[BDEVNAME_SIZE
];
3090 struct md_rdev
*rdev
;
3093 rdev
= kzalloc(sizeof(*rdev
), GFP_KERNEL
);
3095 printk(KERN_ERR
"md: could not alloc mem for new device!\n");
3096 return ERR_PTR(-ENOMEM
);
3099 err
= md_rdev_init(rdev
);
3102 err
= alloc_disk_sb(rdev
);
3106 err
= lock_rdev(rdev
, newdev
, super_format
== -2);
3110 kobject_init(&rdev
->kobj
, &rdev_ktype
);
3112 size
= i_size_read(rdev
->bdev
->bd_inode
) >> BLOCK_SIZE_BITS
;
3115 "md: %s has zero or unknown size, marking faulty!\n",
3116 bdevname(rdev
->bdev
,b
));
3121 if (super_format
>= 0) {
3122 err
= super_types
[super_format
].
3123 load_super(rdev
, NULL
, super_minor
);
3124 if (err
== -EINVAL
) {
3126 "md: %s does not have a valid v%d.%d "
3127 "superblock, not importing!\n",
3128 bdevname(rdev
->bdev
,b
),
3129 super_format
, super_minor
);
3134 "md: could not read %s's sb, not importing!\n",
3135 bdevname(rdev
->bdev
,b
));
3145 md_rdev_clear(rdev
);
3147 return ERR_PTR(err
);
3151 * Check a full RAID array for plausibility
3154 static void analyze_sbs(struct mddev
*mddev
)
3157 struct md_rdev
*rdev
, *freshest
, *tmp
;
3158 char b
[BDEVNAME_SIZE
];
3161 rdev_for_each_safe(rdev
, tmp
, mddev
)
3162 switch (super_types
[mddev
->major_version
].
3163 load_super(rdev
, freshest
, mddev
->minor_version
)) {
3171 "md: fatal superblock inconsistency in %s"
3172 " -- removing from array\n",
3173 bdevname(rdev
->bdev
,b
));
3174 md_kick_rdev_from_array(rdev
);
3177 super_types
[mddev
->major_version
].
3178 validate_super(mddev
, freshest
);
3181 rdev_for_each_safe(rdev
, tmp
, mddev
) {
3182 if (mddev
->max_disks
&&
3183 (rdev
->desc_nr
>= mddev
->max_disks
||
3184 i
> mddev
->max_disks
)) {
3186 "md: %s: %s: only %d devices permitted\n",
3187 mdname(mddev
), bdevname(rdev
->bdev
, b
),
3189 md_kick_rdev_from_array(rdev
);
3192 if (rdev
!= freshest
) {
3193 if (super_types
[mddev
->major_version
].
3194 validate_super(mddev
, rdev
)) {
3195 printk(KERN_WARNING
"md: kicking non-fresh %s"
3197 bdevname(rdev
->bdev
,b
));
3198 md_kick_rdev_from_array(rdev
);
3201 /* No device should have a Candidate flag
3202 * when reading devices
3204 if (test_bit(Candidate
, &rdev
->flags
)) {
3205 pr_info("md: kicking Cluster Candidate %s from array!\n",
3206 bdevname(rdev
->bdev
, b
));
3207 md_kick_rdev_from_array(rdev
);
3210 if (mddev
->level
== LEVEL_MULTIPATH
) {
3211 rdev
->desc_nr
= i
++;
3212 rdev
->raid_disk
= rdev
->desc_nr
;
3213 set_bit(In_sync
, &rdev
->flags
);
3214 } else if (rdev
->raid_disk
>= (mddev
->raid_disks
- min(0, mddev
->delta_disks
))) {
3215 rdev
->raid_disk
= -1;
3216 clear_bit(In_sync
, &rdev
->flags
);
3221 /* Read a fixed-point number.
3222 * Numbers in sysfs attributes should be in "standard" units where
3223 * possible, so time should be in seconds.
3224 * However we internally use a a much smaller unit such as
3225 * milliseconds or jiffies.
3226 * This function takes a decimal number with a possible fractional
3227 * component, and produces an integer which is the result of
3228 * multiplying that number by 10^'scale'.
3229 * all without any floating-point arithmetic.
3231 int strict_strtoul_scaled(const char *cp
, unsigned long *res
, int scale
)
3233 unsigned long result
= 0;
3235 while (isdigit(*cp
) || (*cp
== '.' && decimals
< 0)) {
3238 else if (decimals
< scale
) {
3241 result
= result
* 10 + value
;
3253 while (decimals
< scale
) {
3262 safe_delay_show(struct mddev
*mddev
, char *page
)
3264 int msec
= (mddev
->safemode_delay
*1000)/HZ
;
3265 return sprintf(page
, "%d.%03d\n", msec
/1000, msec
%1000);
3268 safe_delay_store(struct mddev
*mddev
, const char *cbuf
, size_t len
)
3272 if (strict_strtoul_scaled(cbuf
, &msec
, 3) < 0)
3275 mddev
->safemode_delay
= 0;
3277 unsigned long old_delay
= mddev
->safemode_delay
;
3278 unsigned long new_delay
= (msec
*HZ
)/1000;
3282 mddev
->safemode_delay
= new_delay
;
3283 if (new_delay
< old_delay
|| old_delay
== 0)
3284 mod_timer(&mddev
->safemode_timer
, jiffies
+1);
3288 static struct md_sysfs_entry md_safe_delay
=
3289 __ATTR(safe_mode_delay
, S_IRUGO
|S_IWUSR
,safe_delay_show
, safe_delay_store
);
3292 level_show(struct mddev
*mddev
, char *page
)
3294 struct md_personality
*p
;
3296 spin_lock(&mddev
->lock
);
3299 ret
= sprintf(page
, "%s\n", p
->name
);
3300 else if (mddev
->clevel
[0])
3301 ret
= sprintf(page
, "%s\n", mddev
->clevel
);
3302 else if (mddev
->level
!= LEVEL_NONE
)
3303 ret
= sprintf(page
, "%d\n", mddev
->level
);
3306 spin_unlock(&mddev
->lock
);
3311 level_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3316 struct md_personality
*pers
, *oldpers
;
3318 void *priv
, *oldpriv
;
3319 struct md_rdev
*rdev
;
3321 if (slen
== 0 || slen
>= sizeof(clevel
))
3324 rv
= mddev_lock(mddev
);
3328 if (mddev
->pers
== NULL
) {
3329 strncpy(mddev
->clevel
, buf
, slen
);
3330 if (mddev
->clevel
[slen
-1] == '\n')
3332 mddev
->clevel
[slen
] = 0;
3333 mddev
->level
= LEVEL_NONE
;
3341 /* request to change the personality. Need to ensure:
3342 * - array is not engaged in resync/recovery/reshape
3343 * - old personality can be suspended
3344 * - new personality will access other array.
3348 if (mddev
->sync_thread
||
3349 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
3350 mddev
->reshape_position
!= MaxSector
||
3351 mddev
->sysfs_active
)
3355 if (!mddev
->pers
->quiesce
) {
3356 printk(KERN_WARNING
"md: %s: %s does not support online personality change\n",
3357 mdname(mddev
), mddev
->pers
->name
);
3361 /* Now find the new personality */
3362 strncpy(clevel
, buf
, slen
);
3363 if (clevel
[slen
-1] == '\n')
3366 if (kstrtol(clevel
, 10, &level
))
3369 if (request_module("md-%s", clevel
) != 0)
3370 request_module("md-level-%s", clevel
);
3371 spin_lock(&pers_lock
);
3372 pers
= find_pers(level
, clevel
);
3373 if (!pers
|| !try_module_get(pers
->owner
)) {
3374 spin_unlock(&pers_lock
);
3375 printk(KERN_WARNING
"md: personality %s not loaded\n", clevel
);
3379 spin_unlock(&pers_lock
);
3381 if (pers
== mddev
->pers
) {
3382 /* Nothing to do! */
3383 module_put(pers
->owner
);
3387 if (!pers
->takeover
) {
3388 module_put(pers
->owner
);
3389 printk(KERN_WARNING
"md: %s: %s does not support personality takeover\n",
3390 mdname(mddev
), clevel
);
3395 rdev_for_each(rdev
, mddev
)
3396 rdev
->new_raid_disk
= rdev
->raid_disk
;
3398 /* ->takeover must set new_* and/or delta_disks
3399 * if it succeeds, and may set them when it fails.
3401 priv
= pers
->takeover(mddev
);
3403 mddev
->new_level
= mddev
->level
;
3404 mddev
->new_layout
= mddev
->layout
;
3405 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3406 mddev
->raid_disks
-= mddev
->delta_disks
;
3407 mddev
->delta_disks
= 0;
3408 mddev
->reshape_backwards
= 0;
3409 module_put(pers
->owner
);
3410 printk(KERN_WARNING
"md: %s: %s would not accept array\n",
3411 mdname(mddev
), clevel
);
3416 /* Looks like we have a winner */
3417 mddev_suspend(mddev
);
3418 mddev_detach(mddev
);
3420 spin_lock(&mddev
->lock
);
3421 oldpers
= mddev
->pers
;
3422 oldpriv
= mddev
->private;
3424 mddev
->private = priv
;
3425 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
3426 mddev
->level
= mddev
->new_level
;
3427 mddev
->layout
= mddev
->new_layout
;
3428 mddev
->chunk_sectors
= mddev
->new_chunk_sectors
;
3429 mddev
->delta_disks
= 0;
3430 mddev
->reshape_backwards
= 0;
3431 mddev
->degraded
= 0;
3432 spin_unlock(&mddev
->lock
);
3434 if (oldpers
->sync_request
== NULL
&&
3436 /* We are converting from a no-redundancy array
3437 * to a redundancy array and metadata is managed
3438 * externally so we need to be sure that writes
3439 * won't block due to a need to transition
3441 * until external management is started.
3444 mddev
->safemode_delay
= 0;
3445 mddev
->safemode
= 0;
3448 oldpers
->free(mddev
, oldpriv
);
3450 if (oldpers
->sync_request
== NULL
&&
3451 pers
->sync_request
!= NULL
) {
3452 /* need to add the md_redundancy_group */
3453 if (sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
3455 "md: cannot register extra attributes for %s\n",
3457 mddev
->sysfs_action
= sysfs_get_dirent(mddev
->kobj
.sd
, "sync_action");
3459 if (oldpers
->sync_request
!= NULL
&&
3460 pers
->sync_request
== NULL
) {
3461 /* need to remove the md_redundancy_group */
3462 if (mddev
->to_remove
== NULL
)
3463 mddev
->to_remove
= &md_redundancy_group
;
3466 rdev_for_each(rdev
, mddev
) {
3467 if (rdev
->raid_disk
< 0)
3469 if (rdev
->new_raid_disk
>= mddev
->raid_disks
)
3470 rdev
->new_raid_disk
= -1;
3471 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3473 sysfs_unlink_rdev(mddev
, rdev
);
3475 rdev_for_each(rdev
, mddev
) {
3476 if (rdev
->raid_disk
< 0)
3478 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3480 rdev
->raid_disk
= rdev
->new_raid_disk
;
3481 if (rdev
->raid_disk
< 0)
3482 clear_bit(In_sync
, &rdev
->flags
);
3484 if (sysfs_link_rdev(mddev
, rdev
))
3485 printk(KERN_WARNING
"md: cannot register rd%d"
3486 " for %s after level change\n",
3487 rdev
->raid_disk
, mdname(mddev
));
3491 if (pers
->sync_request
== NULL
) {
3492 /* this is now an array without redundancy, so
3493 * it must always be in_sync
3496 del_timer_sync(&mddev
->safemode_timer
);
3498 blk_set_stacking_limits(&mddev
->queue
->limits
);
3500 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
3501 mddev_resume(mddev
);
3503 md_update_sb(mddev
, 1);
3504 sysfs_notify(&mddev
->kobj
, NULL
, "level");
3505 md_new_event(mddev
);
3508 mddev_unlock(mddev
);
3512 static struct md_sysfs_entry md_level
=
3513 __ATTR(level
, S_IRUGO
|S_IWUSR
, level_show
, level_store
);
3516 layout_show(struct mddev
*mddev
, char *page
)
3518 /* just a number, not meaningful for all levels */
3519 if (mddev
->reshape_position
!= MaxSector
&&
3520 mddev
->layout
!= mddev
->new_layout
)
3521 return sprintf(page
, "%d (%d)\n",
3522 mddev
->new_layout
, mddev
->layout
);
3523 return sprintf(page
, "%d\n", mddev
->layout
);
3527 layout_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3532 err
= kstrtouint(buf
, 10, &n
);
3535 err
= mddev_lock(mddev
);
3540 if (mddev
->pers
->check_reshape
== NULL
)
3545 mddev
->new_layout
= n
;
3546 err
= mddev
->pers
->check_reshape(mddev
);
3548 mddev
->new_layout
= mddev
->layout
;
3551 mddev
->new_layout
= n
;
3552 if (mddev
->reshape_position
== MaxSector
)
3555 mddev_unlock(mddev
);
3558 static struct md_sysfs_entry md_layout
=
3559 __ATTR(layout
, S_IRUGO
|S_IWUSR
, layout_show
, layout_store
);
3562 raid_disks_show(struct mddev
*mddev
, char *page
)
3564 if (mddev
->raid_disks
== 0)
3566 if (mddev
->reshape_position
!= MaxSector
&&
3567 mddev
->delta_disks
!= 0)
3568 return sprintf(page
, "%d (%d)\n", mddev
->raid_disks
,
3569 mddev
->raid_disks
- mddev
->delta_disks
);
3570 return sprintf(page
, "%d\n", mddev
->raid_disks
);
3573 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
);
3576 raid_disks_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3581 err
= kstrtouint(buf
, 10, &n
);
3585 err
= mddev_lock(mddev
);
3589 err
= update_raid_disks(mddev
, n
);
3590 else if (mddev
->reshape_position
!= MaxSector
) {
3591 struct md_rdev
*rdev
;
3592 int olddisks
= mddev
->raid_disks
- mddev
->delta_disks
;
3595 rdev_for_each(rdev
, mddev
) {
3597 rdev
->data_offset
< rdev
->new_data_offset
)
3600 rdev
->data_offset
> rdev
->new_data_offset
)
3604 mddev
->delta_disks
= n
- olddisks
;
3605 mddev
->raid_disks
= n
;
3606 mddev
->reshape_backwards
= (mddev
->delta_disks
< 0);
3608 mddev
->raid_disks
= n
;
3610 mddev_unlock(mddev
);
3611 return err
? err
: len
;
3613 static struct md_sysfs_entry md_raid_disks
=
3614 __ATTR(raid_disks
, S_IRUGO
|S_IWUSR
, raid_disks_show
, raid_disks_store
);
3617 chunk_size_show(struct mddev
*mddev
, char *page
)
3619 if (mddev
->reshape_position
!= MaxSector
&&
3620 mddev
->chunk_sectors
!= mddev
->new_chunk_sectors
)
3621 return sprintf(page
, "%d (%d)\n",
3622 mddev
->new_chunk_sectors
<< 9,
3623 mddev
->chunk_sectors
<< 9);
3624 return sprintf(page
, "%d\n", mddev
->chunk_sectors
<< 9);
3628 chunk_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3633 err
= kstrtoul(buf
, 10, &n
);
3637 err
= mddev_lock(mddev
);
3641 if (mddev
->pers
->check_reshape
== NULL
)
3646 mddev
->new_chunk_sectors
= n
>> 9;
3647 err
= mddev
->pers
->check_reshape(mddev
);
3649 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3652 mddev
->new_chunk_sectors
= n
>> 9;
3653 if (mddev
->reshape_position
== MaxSector
)
3654 mddev
->chunk_sectors
= n
>> 9;
3656 mddev_unlock(mddev
);
3659 static struct md_sysfs_entry md_chunk_size
=
3660 __ATTR(chunk_size
, S_IRUGO
|S_IWUSR
, chunk_size_show
, chunk_size_store
);
3663 resync_start_show(struct mddev
*mddev
, char *page
)
3665 if (mddev
->recovery_cp
== MaxSector
)
3666 return sprintf(page
, "none\n");
3667 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->recovery_cp
);
3671 resync_start_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3673 unsigned long long n
;
3676 if (cmd_match(buf
, "none"))
3679 err
= kstrtoull(buf
, 10, &n
);
3682 if (n
!= (sector_t
)n
)
3686 err
= mddev_lock(mddev
);
3689 if (mddev
->pers
&& !test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
3693 mddev
->recovery_cp
= n
;
3695 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
3697 mddev_unlock(mddev
);
3700 static struct md_sysfs_entry md_resync_start
=
3701 __ATTR_PREALLOC(resync_start
, S_IRUGO
|S_IWUSR
,
3702 resync_start_show
, resync_start_store
);
3705 * The array state can be:
3708 * No devices, no size, no level
3709 * Equivalent to STOP_ARRAY ioctl
3711 * May have some settings, but array is not active
3712 * all IO results in error
3713 * When written, doesn't tear down array, but just stops it
3714 * suspended (not supported yet)
3715 * All IO requests will block. The array can be reconfigured.
3716 * Writing this, if accepted, will block until array is quiescent
3718 * no resync can happen. no superblocks get written.
3719 * write requests fail
3721 * like readonly, but behaves like 'clean' on a write request.
3723 * clean - no pending writes, but otherwise active.
3724 * When written to inactive array, starts without resync
3725 * If a write request arrives then
3726 * if metadata is known, mark 'dirty' and switch to 'active'.
3727 * if not known, block and switch to write-pending
3728 * If written to an active array that has pending writes, then fails.
3730 * fully active: IO and resync can be happening.
3731 * When written to inactive array, starts with resync
3734 * clean, but writes are blocked waiting for 'active' to be written.
3737 * like active, but no writes have been seen for a while (100msec).
3740 enum array_state
{ clear
, inactive
, suspended
, readonly
, read_auto
, clean
, active
,
3741 write_pending
, active_idle
, bad_word
};
3742 static char *array_states
[] = {
3743 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3744 "write-pending", "active-idle", NULL
};
3746 static int match_word(const char *word
, char **list
)
3749 for (n
=0; list
[n
]; n
++)
3750 if (cmd_match(word
, list
[n
]))
3756 array_state_show(struct mddev
*mddev
, char *page
)
3758 enum array_state st
= inactive
;
3771 else if (test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
3773 else if (mddev
->safemode
)
3779 if (list_empty(&mddev
->disks
) &&
3780 mddev
->raid_disks
== 0 &&
3781 mddev
->dev_sectors
== 0)
3786 return sprintf(page
, "%s\n", array_states
[st
]);
3789 static int do_md_stop(struct mddev
*mddev
, int ro
, struct block_device
*bdev
);
3790 static int md_set_readonly(struct mddev
*mddev
, struct block_device
*bdev
);
3791 static int do_md_run(struct mddev
*mddev
);
3792 static int restart_array(struct mddev
*mddev
);
3795 array_state_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3798 enum array_state st
= match_word(buf
, array_states
);
3800 if (mddev
->pers
&& (st
== active
|| st
== clean
) && mddev
->ro
!= 1) {
3801 /* don't take reconfig_mutex when toggling between
3804 spin_lock(&mddev
->lock
);
3806 restart_array(mddev
);
3807 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
3808 wake_up(&mddev
->sb_wait
);
3810 } else /* st == clean */ {
3811 restart_array(mddev
);
3812 if (atomic_read(&mddev
->writes_pending
) == 0) {
3813 if (mddev
->in_sync
== 0) {
3815 if (mddev
->safemode
== 1)
3816 mddev
->safemode
= 0;
3817 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
3823 spin_unlock(&mddev
->lock
);
3826 err
= mddev_lock(mddev
);
3834 /* stopping an active array */
3835 err
= do_md_stop(mddev
, 0, NULL
);
3838 /* stopping an active array */
3840 err
= do_md_stop(mddev
, 2, NULL
);
3842 err
= 0; /* already inactive */
3845 break; /* not supported yet */
3848 err
= md_set_readonly(mddev
, NULL
);
3851 set_disk_ro(mddev
->gendisk
, 1);
3852 err
= do_md_run(mddev
);
3858 err
= md_set_readonly(mddev
, NULL
);
3859 else if (mddev
->ro
== 1)
3860 err
= restart_array(mddev
);
3863 set_disk_ro(mddev
->gendisk
, 0);
3867 err
= do_md_run(mddev
);
3872 restart_array(mddev
);
3873 spin_lock(&mddev
->lock
);
3874 if (atomic_read(&mddev
->writes_pending
) == 0) {
3875 if (mddev
->in_sync
== 0) {
3877 if (mddev
->safemode
== 1)
3878 mddev
->safemode
= 0;
3879 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
3884 spin_unlock(&mddev
->lock
);
3890 restart_array(mddev
);
3891 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
3892 wake_up(&mddev
->sb_wait
);
3896 set_disk_ro(mddev
->gendisk
, 0);
3897 err
= do_md_run(mddev
);
3902 /* these cannot be set */
3907 if (mddev
->hold_active
== UNTIL_IOCTL
)
3908 mddev
->hold_active
= 0;
3909 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
3911 mddev_unlock(mddev
);
3914 static struct md_sysfs_entry md_array_state
=
3915 __ATTR_PREALLOC(array_state
, S_IRUGO
|S_IWUSR
, array_state_show
, array_state_store
);
3918 max_corrected_read_errors_show(struct mddev
*mddev
, char *page
) {
3919 return sprintf(page
, "%d\n",
3920 atomic_read(&mddev
->max_corr_read_errors
));
3924 max_corrected_read_errors_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3929 rv
= kstrtouint(buf
, 10, &n
);
3932 atomic_set(&mddev
->max_corr_read_errors
, n
);
3936 static struct md_sysfs_entry max_corr_read_errors
=
3937 __ATTR(max_read_errors
, S_IRUGO
|S_IWUSR
, max_corrected_read_errors_show
,
3938 max_corrected_read_errors_store
);
3941 null_show(struct mddev
*mddev
, char *page
)
3947 new_dev_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3949 /* buf must be %d:%d\n? giving major and minor numbers */
3950 /* The new device is added to the array.
3951 * If the array has a persistent superblock, we read the
3952 * superblock to initialise info and check validity.
3953 * Otherwise, only checking done is that in bind_rdev_to_array,
3954 * which mainly checks size.
3957 int major
= simple_strtoul(buf
, &e
, 10);
3960 struct md_rdev
*rdev
;
3963 if (!*buf
|| *e
!= ':' || !e
[1] || e
[1] == '\n')
3965 minor
= simple_strtoul(e
+1, &e
, 10);
3966 if (*e
&& *e
!= '\n')
3968 dev
= MKDEV(major
, minor
);
3969 if (major
!= MAJOR(dev
) ||
3970 minor
!= MINOR(dev
))
3973 flush_workqueue(md_misc_wq
);
3975 err
= mddev_lock(mddev
);
3978 if (mddev
->persistent
) {
3979 rdev
= md_import_device(dev
, mddev
->major_version
,
3980 mddev
->minor_version
);
3981 if (!IS_ERR(rdev
) && !list_empty(&mddev
->disks
)) {
3982 struct md_rdev
*rdev0
3983 = list_entry(mddev
->disks
.next
,
3984 struct md_rdev
, same_set
);
3985 err
= super_types
[mddev
->major_version
]
3986 .load_super(rdev
, rdev0
, mddev
->minor_version
);
3990 } else if (mddev
->external
)
3991 rdev
= md_import_device(dev
, -2, -1);
3993 rdev
= md_import_device(dev
, -1, -1);
3996 mddev_unlock(mddev
);
3997 return PTR_ERR(rdev
);
3999 err
= bind_rdev_to_array(rdev
, mddev
);
4003 mddev_unlock(mddev
);
4004 return err
? err
: len
;
4007 static struct md_sysfs_entry md_new_device
=
4008 __ATTR(new_dev
, S_IWUSR
, null_show
, new_dev_store
);
4011 bitmap_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4014 unsigned long chunk
, end_chunk
;
4017 err
= mddev_lock(mddev
);
4022 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
4024 chunk
= end_chunk
= simple_strtoul(buf
, &end
, 0);
4025 if (buf
== end
) break;
4026 if (*end
== '-') { /* range */
4028 end_chunk
= simple_strtoul(buf
, &end
, 0);
4029 if (buf
== end
) break;
4031 if (*end
&& !isspace(*end
)) break;
4032 bitmap_dirty_bits(mddev
->bitmap
, chunk
, end_chunk
);
4033 buf
= skip_spaces(end
);
4035 bitmap_unplug(mddev
->bitmap
); /* flush the bits to disk */
4037 mddev_unlock(mddev
);
4041 static struct md_sysfs_entry md_bitmap
=
4042 __ATTR(bitmap_set_bits
, S_IWUSR
, null_show
, bitmap_store
);
4045 size_show(struct mddev
*mddev
, char *page
)
4047 return sprintf(page
, "%llu\n",
4048 (unsigned long long)mddev
->dev_sectors
/ 2);
4051 static int update_size(struct mddev
*mddev
, sector_t num_sectors
);
4054 size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4056 /* If array is inactive, we can reduce the component size, but
4057 * not increase it (except from 0).
4058 * If array is active, we can try an on-line resize
4061 int err
= strict_blocks_to_sectors(buf
, §ors
);
4065 err
= mddev_lock(mddev
);
4069 if (mddev_is_clustered(mddev
))
4070 md_cluster_ops
->metadata_update_start(mddev
);
4071 err
= update_size(mddev
, sectors
);
4072 md_update_sb(mddev
, 1);
4073 if (mddev_is_clustered(mddev
))
4074 md_cluster_ops
->metadata_update_finish(mddev
);
4076 if (mddev
->dev_sectors
== 0 ||
4077 mddev
->dev_sectors
> sectors
)
4078 mddev
->dev_sectors
= sectors
;
4082 mddev_unlock(mddev
);
4083 return err
? err
: len
;
4086 static struct md_sysfs_entry md_size
=
4087 __ATTR(component_size
, S_IRUGO
|S_IWUSR
, size_show
, size_store
);
4089 /* Metadata version.
4091 * 'none' for arrays with no metadata (good luck...)
4092 * 'external' for arrays with externally managed metadata,
4093 * or N.M for internally known formats
4096 metadata_show(struct mddev
*mddev
, char *page
)
4098 if (mddev
->persistent
)
4099 return sprintf(page
, "%d.%d\n",
4100 mddev
->major_version
, mddev
->minor_version
);
4101 else if (mddev
->external
)
4102 return sprintf(page
, "external:%s\n", mddev
->metadata_type
);
4104 return sprintf(page
, "none\n");
4108 metadata_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4113 /* Changing the details of 'external' metadata is
4114 * always permitted. Otherwise there must be
4115 * no devices attached to the array.
4118 err
= mddev_lock(mddev
);
4122 if (mddev
->external
&& strncmp(buf
, "external:", 9) == 0)
4124 else if (!list_empty(&mddev
->disks
))
4128 if (cmd_match(buf
, "none")) {
4129 mddev
->persistent
= 0;
4130 mddev
->external
= 0;
4131 mddev
->major_version
= 0;
4132 mddev
->minor_version
= 90;
4135 if (strncmp(buf
, "external:", 9) == 0) {
4136 size_t namelen
= len
-9;
4137 if (namelen
>= sizeof(mddev
->metadata_type
))
4138 namelen
= sizeof(mddev
->metadata_type
)-1;
4139 strncpy(mddev
->metadata_type
, buf
+9, namelen
);
4140 mddev
->metadata_type
[namelen
] = 0;
4141 if (namelen
&& mddev
->metadata_type
[namelen
-1] == '\n')
4142 mddev
->metadata_type
[--namelen
] = 0;
4143 mddev
->persistent
= 0;
4144 mddev
->external
= 1;
4145 mddev
->major_version
= 0;
4146 mddev
->minor_version
= 90;
4149 major
= simple_strtoul(buf
, &e
, 10);
4151 if (e
==buf
|| *e
!= '.')
4154 minor
= simple_strtoul(buf
, &e
, 10);
4155 if (e
==buf
|| (*e
&& *e
!= '\n') )
4158 if (major
>= ARRAY_SIZE(super_types
) || super_types
[major
].name
== NULL
)
4160 mddev
->major_version
= major
;
4161 mddev
->minor_version
= minor
;
4162 mddev
->persistent
= 1;
4163 mddev
->external
= 0;
4166 mddev_unlock(mddev
);
4170 static struct md_sysfs_entry md_metadata
=
4171 __ATTR_PREALLOC(metadata_version
, S_IRUGO
|S_IWUSR
, metadata_show
, metadata_store
);
4174 action_show(struct mddev
*mddev
, char *page
)
4176 char *type
= "idle";
4177 unsigned long recovery
= mddev
->recovery
;
4178 if (test_bit(MD_RECOVERY_FROZEN
, &recovery
))
4180 else if (test_bit(MD_RECOVERY_RUNNING
, &recovery
) ||
4181 (!mddev
->ro
&& test_bit(MD_RECOVERY_NEEDED
, &recovery
))) {
4182 if (test_bit(MD_RECOVERY_RESHAPE
, &recovery
))
4184 else if (test_bit(MD_RECOVERY_SYNC
, &recovery
)) {
4185 if (!test_bit(MD_RECOVERY_REQUESTED
, &recovery
))
4187 else if (test_bit(MD_RECOVERY_CHECK
, &recovery
))
4191 } else if (test_bit(MD_RECOVERY_RECOVER
, &recovery
))
4193 else if (mddev
->reshape_position
!= MaxSector
)
4196 return sprintf(page
, "%s\n", type
);
4200 action_store(struct mddev
*mddev
, const char *page
, size_t len
)
4202 if (!mddev
->pers
|| !mddev
->pers
->sync_request
)
4206 if (cmd_match(page
, "idle") || cmd_match(page
, "frozen")) {
4207 if (cmd_match(page
, "frozen"))
4208 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4210 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4211 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
4212 mddev_lock(mddev
) == 0) {
4213 flush_workqueue(md_misc_wq
);
4214 if (mddev
->sync_thread
) {
4215 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4216 md_reap_sync_thread(mddev
);
4218 mddev_unlock(mddev
);
4220 } else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
4221 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
4223 else if (cmd_match(page
, "resync"))
4224 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4225 else if (cmd_match(page
, "recover")) {
4226 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4227 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
4228 } else if (cmd_match(page
, "reshape")) {
4230 if (mddev
->pers
->start_reshape
== NULL
)
4232 err
= mddev_lock(mddev
);
4234 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4235 err
= mddev
->pers
->start_reshape(mddev
);
4236 mddev_unlock(mddev
);
4240 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
4242 if (cmd_match(page
, "check"))
4243 set_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
4244 else if (!cmd_match(page
, "repair"))
4246 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4247 set_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
4248 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
4250 if (mddev
->ro
== 2) {
4251 /* A write to sync_action is enough to justify
4252 * canceling read-auto mode
4255 md_wakeup_thread(mddev
->sync_thread
);
4257 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4258 md_wakeup_thread(mddev
->thread
);
4259 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
4263 static struct md_sysfs_entry md_scan_mode
=
4264 __ATTR_PREALLOC(sync_action
, S_IRUGO
|S_IWUSR
, action_show
, action_store
);
4267 last_sync_action_show(struct mddev
*mddev
, char *page
)
4269 return sprintf(page
, "%s\n", mddev
->last_sync_action
);
4272 static struct md_sysfs_entry md_last_scan_mode
= __ATTR_RO(last_sync_action
);
4275 mismatch_cnt_show(struct mddev
*mddev
, char *page
)
4277 return sprintf(page
, "%llu\n",
4278 (unsigned long long)
4279 atomic64_read(&mddev
->resync_mismatches
));
4282 static struct md_sysfs_entry md_mismatches
= __ATTR_RO(mismatch_cnt
);
4285 sync_min_show(struct mddev
*mddev
, char *page
)
4287 return sprintf(page
, "%d (%s)\n", speed_min(mddev
),
4288 mddev
->sync_speed_min
? "local": "system");
4292 sync_min_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4297 if (strncmp(buf
, "system", 6)==0) {
4300 rv
= kstrtouint(buf
, 10, &min
);
4306 mddev
->sync_speed_min
= min
;
4310 static struct md_sysfs_entry md_sync_min
=
4311 __ATTR(sync_speed_min
, S_IRUGO
|S_IWUSR
, sync_min_show
, sync_min_store
);
4314 sync_max_show(struct mddev
*mddev
, char *page
)
4316 return sprintf(page
, "%d (%s)\n", speed_max(mddev
),
4317 mddev
->sync_speed_max
? "local": "system");
4321 sync_max_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4326 if (strncmp(buf
, "system", 6)==0) {
4329 rv
= kstrtouint(buf
, 10, &max
);
4335 mddev
->sync_speed_max
= max
;
4339 static struct md_sysfs_entry md_sync_max
=
4340 __ATTR(sync_speed_max
, S_IRUGO
|S_IWUSR
, sync_max_show
, sync_max_store
);
4343 degraded_show(struct mddev
*mddev
, char *page
)
4345 return sprintf(page
, "%d\n", mddev
->degraded
);
4347 static struct md_sysfs_entry md_degraded
= __ATTR_RO(degraded
);
4350 sync_force_parallel_show(struct mddev
*mddev
, char *page
)
4352 return sprintf(page
, "%d\n", mddev
->parallel_resync
);
4356 sync_force_parallel_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4360 if (kstrtol(buf
, 10, &n
))
4363 if (n
!= 0 && n
!= 1)
4366 mddev
->parallel_resync
= n
;
4368 if (mddev
->sync_thread
)
4369 wake_up(&resync_wait
);
4374 /* force parallel resync, even with shared block devices */
4375 static struct md_sysfs_entry md_sync_force_parallel
=
4376 __ATTR(sync_force_parallel
, S_IRUGO
|S_IWUSR
,
4377 sync_force_parallel_show
, sync_force_parallel_store
);
4380 sync_speed_show(struct mddev
*mddev
, char *page
)
4382 unsigned long resync
, dt
, db
;
4383 if (mddev
->curr_resync
== 0)
4384 return sprintf(page
, "none\n");
4385 resync
= mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
);
4386 dt
= (jiffies
- mddev
->resync_mark
) / HZ
;
4388 db
= resync
- mddev
->resync_mark_cnt
;
4389 return sprintf(page
, "%lu\n", db
/dt
/2); /* K/sec */
4392 static struct md_sysfs_entry md_sync_speed
= __ATTR_RO(sync_speed
);
4395 sync_completed_show(struct mddev
*mddev
, char *page
)
4397 unsigned long long max_sectors
, resync
;
4399 if (!test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4400 return sprintf(page
, "none\n");
4402 if (mddev
->curr_resync
== 1 ||
4403 mddev
->curr_resync
== 2)
4404 return sprintf(page
, "delayed\n");
4406 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
4407 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
4408 max_sectors
= mddev
->resync_max_sectors
;
4410 max_sectors
= mddev
->dev_sectors
;
4412 resync
= mddev
->curr_resync_completed
;
4413 return sprintf(page
, "%llu / %llu\n", resync
, max_sectors
);
4416 static struct md_sysfs_entry md_sync_completed
=
4417 __ATTR_PREALLOC(sync_completed
, S_IRUGO
, sync_completed_show
, NULL
);
4420 min_sync_show(struct mddev
*mddev
, char *page
)
4422 return sprintf(page
, "%llu\n",
4423 (unsigned long long)mddev
->resync_min
);
4426 min_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4428 unsigned long long min
;
4431 if (kstrtoull(buf
, 10, &min
))
4434 spin_lock(&mddev
->lock
);
4436 if (min
> mddev
->resync_max
)
4440 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4443 /* Round down to multiple of 4K for safety */
4444 mddev
->resync_min
= round_down(min
, 8);
4448 spin_unlock(&mddev
->lock
);
4452 static struct md_sysfs_entry md_min_sync
=
4453 __ATTR(sync_min
, S_IRUGO
|S_IWUSR
, min_sync_show
, min_sync_store
);
4456 max_sync_show(struct mddev
*mddev
, char *page
)
4458 if (mddev
->resync_max
== MaxSector
)
4459 return sprintf(page
, "max\n");
4461 return sprintf(page
, "%llu\n",
4462 (unsigned long long)mddev
->resync_max
);
4465 max_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4468 spin_lock(&mddev
->lock
);
4469 if (strncmp(buf
, "max", 3) == 0)
4470 mddev
->resync_max
= MaxSector
;
4472 unsigned long long max
;
4476 if (kstrtoull(buf
, 10, &max
))
4478 if (max
< mddev
->resync_min
)
4482 if (max
< mddev
->resync_max
&&
4484 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4487 /* Must be a multiple of chunk_size */
4488 chunk
= mddev
->chunk_sectors
;
4490 sector_t temp
= max
;
4493 if (sector_div(temp
, chunk
))
4496 mddev
->resync_max
= max
;
4498 wake_up(&mddev
->recovery_wait
);
4501 spin_unlock(&mddev
->lock
);
4505 static struct md_sysfs_entry md_max_sync
=
4506 __ATTR(sync_max
, S_IRUGO
|S_IWUSR
, max_sync_show
, max_sync_store
);
4509 suspend_lo_show(struct mddev
*mddev
, char *page
)
4511 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_lo
);
4515 suspend_lo_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4517 unsigned long long old
, new;
4520 err
= kstrtoull(buf
, 10, &new);
4523 if (new != (sector_t
)new)
4526 err
= mddev_lock(mddev
);
4530 if (mddev
->pers
== NULL
||
4531 mddev
->pers
->quiesce
== NULL
)
4533 old
= mddev
->suspend_lo
;
4534 mddev
->suspend_lo
= new;
4536 /* Shrinking suspended region */
4537 mddev
->pers
->quiesce(mddev
, 2);
4539 /* Expanding suspended region - need to wait */
4540 mddev
->pers
->quiesce(mddev
, 1);
4541 mddev
->pers
->quiesce(mddev
, 0);
4545 mddev_unlock(mddev
);
4548 static struct md_sysfs_entry md_suspend_lo
=
4549 __ATTR(suspend_lo
, S_IRUGO
|S_IWUSR
, suspend_lo_show
, suspend_lo_store
);
4552 suspend_hi_show(struct mddev
*mddev
, char *page
)
4554 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_hi
);
4558 suspend_hi_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4560 unsigned long long old
, new;
4563 err
= kstrtoull(buf
, 10, &new);
4566 if (new != (sector_t
)new)
4569 err
= mddev_lock(mddev
);
4573 if (mddev
->pers
== NULL
||
4574 mddev
->pers
->quiesce
== NULL
)
4576 old
= mddev
->suspend_hi
;
4577 mddev
->suspend_hi
= new;
4579 /* Shrinking suspended region */
4580 mddev
->pers
->quiesce(mddev
, 2);
4582 /* Expanding suspended region - need to wait */
4583 mddev
->pers
->quiesce(mddev
, 1);
4584 mddev
->pers
->quiesce(mddev
, 0);
4588 mddev_unlock(mddev
);
4591 static struct md_sysfs_entry md_suspend_hi
=
4592 __ATTR(suspend_hi
, S_IRUGO
|S_IWUSR
, suspend_hi_show
, suspend_hi_store
);
4595 reshape_position_show(struct mddev
*mddev
, char *page
)
4597 if (mddev
->reshape_position
!= MaxSector
)
4598 return sprintf(page
, "%llu\n",
4599 (unsigned long long)mddev
->reshape_position
);
4600 strcpy(page
, "none\n");
4605 reshape_position_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4607 struct md_rdev
*rdev
;
4608 unsigned long long new;
4611 err
= kstrtoull(buf
, 10, &new);
4614 if (new != (sector_t
)new)
4616 err
= mddev_lock(mddev
);
4622 mddev
->reshape_position
= new;
4623 mddev
->delta_disks
= 0;
4624 mddev
->reshape_backwards
= 0;
4625 mddev
->new_level
= mddev
->level
;
4626 mddev
->new_layout
= mddev
->layout
;
4627 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
4628 rdev_for_each(rdev
, mddev
)
4629 rdev
->new_data_offset
= rdev
->data_offset
;
4632 mddev_unlock(mddev
);
4636 static struct md_sysfs_entry md_reshape_position
=
4637 __ATTR(reshape_position
, S_IRUGO
|S_IWUSR
, reshape_position_show
,
4638 reshape_position_store
);
4641 reshape_direction_show(struct mddev
*mddev
, char *page
)
4643 return sprintf(page
, "%s\n",
4644 mddev
->reshape_backwards
? "backwards" : "forwards");
4648 reshape_direction_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4653 if (cmd_match(buf
, "forwards"))
4655 else if (cmd_match(buf
, "backwards"))
4659 if (mddev
->reshape_backwards
== backwards
)
4662 err
= mddev_lock(mddev
);
4665 /* check if we are allowed to change */
4666 if (mddev
->delta_disks
)
4668 else if (mddev
->persistent
&&
4669 mddev
->major_version
== 0)
4672 mddev
->reshape_backwards
= backwards
;
4673 mddev_unlock(mddev
);
4677 static struct md_sysfs_entry md_reshape_direction
=
4678 __ATTR(reshape_direction
, S_IRUGO
|S_IWUSR
, reshape_direction_show
,
4679 reshape_direction_store
);
4682 array_size_show(struct mddev
*mddev
, char *page
)
4684 if (mddev
->external_size
)
4685 return sprintf(page
, "%llu\n",
4686 (unsigned long long)mddev
->array_sectors
/2);
4688 return sprintf(page
, "default\n");
4692 array_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4697 err
= mddev_lock(mddev
);
4701 if (strncmp(buf
, "default", 7) == 0) {
4703 sectors
= mddev
->pers
->size(mddev
, 0, 0);
4705 sectors
= mddev
->array_sectors
;
4707 mddev
->external_size
= 0;
4709 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
4711 else if (mddev
->pers
&& mddev
->pers
->size(mddev
, 0, 0) < sectors
)
4714 mddev
->external_size
= 1;
4718 mddev
->array_sectors
= sectors
;
4720 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
4721 revalidate_disk(mddev
->gendisk
);
4724 mddev_unlock(mddev
);
4728 static struct md_sysfs_entry md_array_size
=
4729 __ATTR(array_size
, S_IRUGO
|S_IWUSR
, array_size_show
,
4732 static struct attribute
*md_default_attrs
[] = {
4735 &md_raid_disks
.attr
,
4736 &md_chunk_size
.attr
,
4738 &md_resync_start
.attr
,
4740 &md_new_device
.attr
,
4741 &md_safe_delay
.attr
,
4742 &md_array_state
.attr
,
4743 &md_reshape_position
.attr
,
4744 &md_reshape_direction
.attr
,
4745 &md_array_size
.attr
,
4746 &max_corr_read_errors
.attr
,
4750 static struct attribute
*md_redundancy_attrs
[] = {
4752 &md_last_scan_mode
.attr
,
4753 &md_mismatches
.attr
,
4756 &md_sync_speed
.attr
,
4757 &md_sync_force_parallel
.attr
,
4758 &md_sync_completed
.attr
,
4761 &md_suspend_lo
.attr
,
4762 &md_suspend_hi
.attr
,
4767 static struct attribute_group md_redundancy_group
= {
4769 .attrs
= md_redundancy_attrs
,
4773 md_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
4775 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4776 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
4781 spin_lock(&all_mddevs_lock
);
4782 if (list_empty(&mddev
->all_mddevs
)) {
4783 spin_unlock(&all_mddevs_lock
);
4787 spin_unlock(&all_mddevs_lock
);
4789 rv
= entry
->show(mddev
, page
);
4795 md_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
4796 const char *page
, size_t length
)
4798 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4799 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
4804 if (!capable(CAP_SYS_ADMIN
))
4806 spin_lock(&all_mddevs_lock
);
4807 if (list_empty(&mddev
->all_mddevs
)) {
4808 spin_unlock(&all_mddevs_lock
);
4812 spin_unlock(&all_mddevs_lock
);
4813 rv
= entry
->store(mddev
, page
, length
);
4818 static void md_free(struct kobject
*ko
)
4820 struct mddev
*mddev
= container_of(ko
, struct mddev
, kobj
);
4822 if (mddev
->sysfs_state
)
4823 sysfs_put(mddev
->sysfs_state
);
4826 blk_cleanup_queue(mddev
->queue
);
4827 if (mddev
->gendisk
) {
4828 del_gendisk(mddev
->gendisk
);
4829 put_disk(mddev
->gendisk
);
4835 static const struct sysfs_ops md_sysfs_ops
= {
4836 .show
= md_attr_show
,
4837 .store
= md_attr_store
,
4839 static struct kobj_type md_ktype
= {
4841 .sysfs_ops
= &md_sysfs_ops
,
4842 .default_attrs
= md_default_attrs
,
4847 static void mddev_delayed_delete(struct work_struct
*ws
)
4849 struct mddev
*mddev
= container_of(ws
, struct mddev
, del_work
);
4851 sysfs_remove_group(&mddev
->kobj
, &md_bitmap_group
);
4852 kobject_del(&mddev
->kobj
);
4853 kobject_put(&mddev
->kobj
);
4856 static int md_alloc(dev_t dev
, char *name
)
4858 static DEFINE_MUTEX(disks_mutex
);
4859 struct mddev
*mddev
= mddev_find(dev
);
4860 struct gendisk
*disk
;
4869 partitioned
= (MAJOR(mddev
->unit
) != MD_MAJOR
);
4870 shift
= partitioned
? MdpMinorShift
: 0;
4871 unit
= MINOR(mddev
->unit
) >> shift
;
4873 /* wait for any previous instance of this device to be
4874 * completely removed (mddev_delayed_delete).
4876 flush_workqueue(md_misc_wq
);
4878 mutex_lock(&disks_mutex
);
4884 /* Need to ensure that 'name' is not a duplicate.
4886 struct mddev
*mddev2
;
4887 spin_lock(&all_mddevs_lock
);
4889 list_for_each_entry(mddev2
, &all_mddevs
, all_mddevs
)
4890 if (mddev2
->gendisk
&&
4891 strcmp(mddev2
->gendisk
->disk_name
, name
) == 0) {
4892 spin_unlock(&all_mddevs_lock
);
4895 spin_unlock(&all_mddevs_lock
);
4899 mddev
->queue
= blk_alloc_queue(GFP_KERNEL
);
4902 mddev
->queue
->queuedata
= mddev
;
4904 blk_queue_make_request(mddev
->queue
, md_make_request
);
4905 blk_set_stacking_limits(&mddev
->queue
->limits
);
4907 disk
= alloc_disk(1 << shift
);
4909 blk_cleanup_queue(mddev
->queue
);
4910 mddev
->queue
= NULL
;
4913 disk
->major
= MAJOR(mddev
->unit
);
4914 disk
->first_minor
= unit
<< shift
;
4916 strcpy(disk
->disk_name
, name
);
4917 else if (partitioned
)
4918 sprintf(disk
->disk_name
, "md_d%d", unit
);
4920 sprintf(disk
->disk_name
, "md%d", unit
);
4921 disk
->fops
= &md_fops
;
4922 disk
->private_data
= mddev
;
4923 disk
->queue
= mddev
->queue
;
4924 blk_queue_flush(mddev
->queue
, REQ_FLUSH
| REQ_FUA
);
4925 /* Allow extended partitions. This makes the
4926 * 'mdp' device redundant, but we can't really
4929 disk
->flags
|= GENHD_FL_EXT_DEVT
;
4930 mddev
->gendisk
= disk
;
4931 /* As soon as we call add_disk(), another thread could get
4932 * through to md_open, so make sure it doesn't get too far
4934 mutex_lock(&mddev
->open_mutex
);
4937 error
= kobject_init_and_add(&mddev
->kobj
, &md_ktype
,
4938 &disk_to_dev(disk
)->kobj
, "%s", "md");
4940 /* This isn't possible, but as kobject_init_and_add is marked
4941 * __must_check, we must do something with the result
4943 printk(KERN_WARNING
"md: cannot register %s/md - name in use\n",
4947 if (mddev
->kobj
.sd
&&
4948 sysfs_create_group(&mddev
->kobj
, &md_bitmap_group
))
4949 printk(KERN_DEBUG
"pointless warning\n");
4950 mutex_unlock(&mddev
->open_mutex
);
4952 mutex_unlock(&disks_mutex
);
4953 if (!error
&& mddev
->kobj
.sd
) {
4954 kobject_uevent(&mddev
->kobj
, KOBJ_ADD
);
4955 mddev
->sysfs_state
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "array_state");
4961 static struct kobject
*md_probe(dev_t dev
, int *part
, void *data
)
4963 md_alloc(dev
, NULL
);
4967 static int add_named_array(const char *val
, struct kernel_param
*kp
)
4969 /* val must be "md_*" where * is not all digits.
4970 * We allocate an array with a large free minor number, and
4971 * set the name to val. val must not already be an active name.
4973 int len
= strlen(val
);
4974 char buf
[DISK_NAME_LEN
];
4976 while (len
&& val
[len
-1] == '\n')
4978 if (len
>= DISK_NAME_LEN
)
4980 strlcpy(buf
, val
, len
+1);
4981 if (strncmp(buf
, "md_", 3) != 0)
4983 return md_alloc(0, buf
);
4986 static void md_safemode_timeout(unsigned long data
)
4988 struct mddev
*mddev
= (struct mddev
*) data
;
4990 if (!atomic_read(&mddev
->writes_pending
)) {
4991 mddev
->safemode
= 1;
4992 if (mddev
->external
)
4993 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4995 md_wakeup_thread(mddev
->thread
);
4998 static int start_dirty_degraded
;
5000 int md_run(struct mddev
*mddev
)
5003 struct md_rdev
*rdev
;
5004 struct md_personality
*pers
;
5006 if (list_empty(&mddev
->disks
))
5007 /* cannot run an array with no devices.. */
5012 /* Cannot run until previous stop completes properly */
5013 if (mddev
->sysfs_active
)
5017 * Analyze all RAID superblock(s)
5019 if (!mddev
->raid_disks
) {
5020 if (!mddev
->persistent
)
5025 if (mddev
->level
!= LEVEL_NONE
)
5026 request_module("md-level-%d", mddev
->level
);
5027 else if (mddev
->clevel
[0])
5028 request_module("md-%s", mddev
->clevel
);
5031 * Drop all container device buffers, from now on
5032 * the only valid external interface is through the md
5035 rdev_for_each(rdev
, mddev
) {
5036 if (test_bit(Faulty
, &rdev
->flags
))
5038 sync_blockdev(rdev
->bdev
);
5039 invalidate_bdev(rdev
->bdev
);
5041 /* perform some consistency tests on the device.
5042 * We don't want the data to overlap the metadata,
5043 * Internal Bitmap issues have been handled elsewhere.
5045 if (rdev
->meta_bdev
) {
5046 /* Nothing to check */;
5047 } else if (rdev
->data_offset
< rdev
->sb_start
) {
5048 if (mddev
->dev_sectors
&&
5049 rdev
->data_offset
+ mddev
->dev_sectors
5051 printk("md: %s: data overlaps metadata\n",
5056 if (rdev
->sb_start
+ rdev
->sb_size
/512
5057 > rdev
->data_offset
) {
5058 printk("md: %s: metadata overlaps data\n",
5063 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
5066 if (mddev
->bio_set
== NULL
)
5067 mddev
->bio_set
= bioset_create(BIO_POOL_SIZE
, 0);
5069 spin_lock(&pers_lock
);
5070 pers
= find_pers(mddev
->level
, mddev
->clevel
);
5071 if (!pers
|| !try_module_get(pers
->owner
)) {
5072 spin_unlock(&pers_lock
);
5073 if (mddev
->level
!= LEVEL_NONE
)
5074 printk(KERN_WARNING
"md: personality for level %d is not loaded!\n",
5077 printk(KERN_WARNING
"md: personality for level %s is not loaded!\n",
5081 spin_unlock(&pers_lock
);
5082 if (mddev
->level
!= pers
->level
) {
5083 mddev
->level
= pers
->level
;
5084 mddev
->new_level
= pers
->level
;
5086 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
5088 if (mddev
->reshape_position
!= MaxSector
&&
5089 pers
->start_reshape
== NULL
) {
5090 /* This personality cannot handle reshaping... */
5091 module_put(pers
->owner
);
5095 if (pers
->sync_request
) {
5096 /* Warn if this is a potentially silly
5099 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
5100 struct md_rdev
*rdev2
;
5103 rdev_for_each(rdev
, mddev
)
5104 rdev_for_each(rdev2
, mddev
) {
5106 rdev
->bdev
->bd_contains
==
5107 rdev2
->bdev
->bd_contains
) {
5109 "%s: WARNING: %s appears to be"
5110 " on the same physical disk as"
5113 bdevname(rdev
->bdev
,b
),
5114 bdevname(rdev2
->bdev
,b2
));
5121 "True protection against single-disk"
5122 " failure might be compromised.\n");
5125 mddev
->recovery
= 0;
5126 /* may be over-ridden by personality */
5127 mddev
->resync_max_sectors
= mddev
->dev_sectors
;
5129 mddev
->ok_start_degraded
= start_dirty_degraded
;
5131 if (start_readonly
&& mddev
->ro
== 0)
5132 mddev
->ro
= 2; /* read-only, but switch on first write */
5134 err
= pers
->run(mddev
);
5136 printk(KERN_ERR
"md: pers->run() failed ...\n");
5137 else if (pers
->size(mddev
, 0, 0) < mddev
->array_sectors
) {
5138 WARN_ONCE(!mddev
->external_size
, "%s: default size too small,"
5139 " but 'external_size' not in effect?\n", __func__
);
5141 "md: invalid array_size %llu > default size %llu\n",
5142 (unsigned long long)mddev
->array_sectors
/ 2,
5143 (unsigned long long)pers
->size(mddev
, 0, 0) / 2);
5146 if (err
== 0 && pers
->sync_request
&&
5147 (mddev
->bitmap_info
.file
|| mddev
->bitmap_info
.offset
)) {
5148 struct bitmap
*bitmap
;
5150 bitmap
= bitmap_create(mddev
, -1);
5151 if (IS_ERR(bitmap
)) {
5152 err
= PTR_ERR(bitmap
);
5153 printk(KERN_ERR
"%s: failed to create bitmap (%d)\n",
5154 mdname(mddev
), err
);
5156 mddev
->bitmap
= bitmap
;
5160 mddev_detach(mddev
);
5162 pers
->free(mddev
, mddev
->private);
5163 mddev
->private = NULL
;
5164 module_put(pers
->owner
);
5165 bitmap_destroy(mddev
);
5169 mddev
->queue
->backing_dev_info
.congested_data
= mddev
;
5170 mddev
->queue
->backing_dev_info
.congested_fn
= md_congested
;
5172 if (pers
->sync_request
) {
5173 if (mddev
->kobj
.sd
&&
5174 sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
5176 "md: cannot register extra attributes for %s\n",
5178 mddev
->sysfs_action
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "sync_action");
5179 } else if (mddev
->ro
== 2) /* auto-readonly not meaningful */
5182 atomic_set(&mddev
->writes_pending
,0);
5183 atomic_set(&mddev
->max_corr_read_errors
,
5184 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS
);
5185 mddev
->safemode
= 0;
5186 mddev
->safemode_delay
= (200 * HZ
)/1000 +1; /* 200 msec delay */
5189 spin_lock(&mddev
->lock
);
5192 spin_unlock(&mddev
->lock
);
5193 rdev_for_each(rdev
, mddev
)
5194 if (rdev
->raid_disk
>= 0)
5195 if (sysfs_link_rdev(mddev
, rdev
))
5196 /* failure here is OK */;
5198 if (mddev
->degraded
&& !mddev
->ro
)
5199 /* This ensures that recovering status is reported immediately
5200 * via sysfs - until a lack of spares is confirmed.
5202 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
5203 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5205 if (mddev
->flags
& MD_UPDATE_SB_FLAGS
)
5206 md_update_sb(mddev
, 0);
5208 md_new_event(mddev
);
5209 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5210 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
5211 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
5214 EXPORT_SYMBOL_GPL(md_run
);
5216 static int do_md_run(struct mddev
*mddev
)
5220 err
= md_run(mddev
);
5223 err
= bitmap_load(mddev
);
5225 bitmap_destroy(mddev
);
5229 md_wakeup_thread(mddev
->thread
);
5230 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
5232 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
5233 revalidate_disk(mddev
->gendisk
);
5235 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
5240 static int restart_array(struct mddev
*mddev
)
5242 struct gendisk
*disk
= mddev
->gendisk
;
5244 /* Complain if it has no devices */
5245 if (list_empty(&mddev
->disks
))
5251 mddev
->safemode
= 0;
5253 set_disk_ro(disk
, 0);
5254 printk(KERN_INFO
"md: %s switched to read-write mode.\n",
5256 /* Kick recovery or resync if necessary */
5257 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5258 md_wakeup_thread(mddev
->thread
);
5259 md_wakeup_thread(mddev
->sync_thread
);
5260 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5264 static void md_clean(struct mddev
*mddev
)
5266 mddev
->array_sectors
= 0;
5267 mddev
->external_size
= 0;
5268 mddev
->dev_sectors
= 0;
5269 mddev
->raid_disks
= 0;
5270 mddev
->recovery_cp
= 0;
5271 mddev
->resync_min
= 0;
5272 mddev
->resync_max
= MaxSector
;
5273 mddev
->reshape_position
= MaxSector
;
5274 mddev
->external
= 0;
5275 mddev
->persistent
= 0;
5276 mddev
->level
= LEVEL_NONE
;
5277 mddev
->clevel
[0] = 0;
5280 mddev
->metadata_type
[0] = 0;
5281 mddev
->chunk_sectors
= 0;
5282 mddev
->ctime
= mddev
->utime
= 0;
5284 mddev
->max_disks
= 0;
5286 mddev
->can_decrease_events
= 0;
5287 mddev
->delta_disks
= 0;
5288 mddev
->reshape_backwards
= 0;
5289 mddev
->new_level
= LEVEL_NONE
;
5290 mddev
->new_layout
= 0;
5291 mddev
->new_chunk_sectors
= 0;
5292 mddev
->curr_resync
= 0;
5293 atomic64_set(&mddev
->resync_mismatches
, 0);
5294 mddev
->suspend_lo
= mddev
->suspend_hi
= 0;
5295 mddev
->sync_speed_min
= mddev
->sync_speed_max
= 0;
5296 mddev
->recovery
= 0;
5299 mddev
->degraded
= 0;
5300 mddev
->safemode
= 0;
5301 mddev
->private = NULL
;
5302 mddev
->bitmap_info
.offset
= 0;
5303 mddev
->bitmap_info
.default_offset
= 0;
5304 mddev
->bitmap_info
.default_space
= 0;
5305 mddev
->bitmap_info
.chunksize
= 0;
5306 mddev
->bitmap_info
.daemon_sleep
= 0;
5307 mddev
->bitmap_info
.max_write_behind
= 0;
5310 static void __md_stop_writes(struct mddev
*mddev
)
5312 if (mddev_is_clustered(mddev
))
5313 md_cluster_ops
->metadata_update_start(mddev
);
5314 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5315 flush_workqueue(md_misc_wq
);
5316 if (mddev
->sync_thread
) {
5317 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5318 md_reap_sync_thread(mddev
);
5321 del_timer_sync(&mddev
->safemode_timer
);
5323 bitmap_flush(mddev
);
5324 md_super_wait(mddev
);
5326 if (mddev
->ro
== 0 &&
5327 (!mddev
->in_sync
|| (mddev
->flags
& MD_UPDATE_SB_FLAGS
))) {
5328 /* mark array as shutdown cleanly */
5330 md_update_sb(mddev
, 1);
5332 if (mddev_is_clustered(mddev
))
5333 md_cluster_ops
->metadata_update_finish(mddev
);
5336 void md_stop_writes(struct mddev
*mddev
)
5338 mddev_lock_nointr(mddev
);
5339 __md_stop_writes(mddev
);
5340 mddev_unlock(mddev
);
5342 EXPORT_SYMBOL_GPL(md_stop_writes
);
5344 static void mddev_detach(struct mddev
*mddev
)
5346 struct bitmap
*bitmap
= mddev
->bitmap
;
5347 /* wait for behind writes to complete */
5348 if (bitmap
&& atomic_read(&bitmap
->behind_writes
) > 0) {
5349 printk(KERN_INFO
"md:%s: behind writes in progress - waiting to stop.\n",
5351 /* need to kick something here to make sure I/O goes? */
5352 wait_event(bitmap
->behind_wait
,
5353 atomic_read(&bitmap
->behind_writes
) == 0);
5355 if (mddev
->pers
&& mddev
->pers
->quiesce
) {
5356 mddev
->pers
->quiesce(mddev
, 1);
5357 mddev
->pers
->quiesce(mddev
, 0);
5359 md_unregister_thread(&mddev
->thread
);
5361 blk_sync_queue(mddev
->queue
); /* the unplug fn references 'conf'*/
5364 static void __md_stop(struct mddev
*mddev
)
5366 struct md_personality
*pers
= mddev
->pers
;
5367 mddev_detach(mddev
);
5368 /* Ensure ->event_work is done */
5369 flush_workqueue(md_misc_wq
);
5370 spin_lock(&mddev
->lock
);
5373 spin_unlock(&mddev
->lock
);
5374 pers
->free(mddev
, mddev
->private);
5375 mddev
->private = NULL
;
5376 if (pers
->sync_request
&& mddev
->to_remove
== NULL
)
5377 mddev
->to_remove
= &md_redundancy_group
;
5378 module_put(pers
->owner
);
5379 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5382 void md_stop(struct mddev
*mddev
)
5384 /* stop the array and free an attached data structures.
5385 * This is called from dm-raid
5388 bitmap_destroy(mddev
);
5390 bioset_free(mddev
->bio_set
);
5393 EXPORT_SYMBOL_GPL(md_stop
);
5395 static int md_set_readonly(struct mddev
*mddev
, struct block_device
*bdev
)
5400 if (!test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
)) {
5402 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5403 md_wakeup_thread(mddev
->thread
);
5405 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
5406 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5407 if (mddev
->sync_thread
)
5408 /* Thread might be blocked waiting for metadata update
5409 * which will now never happen */
5410 wake_up_process(mddev
->sync_thread
->tsk
);
5412 if (mddev
->external
&& test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
5414 mddev_unlock(mddev
);
5415 wait_event(resync_wait
, !test_bit(MD_RECOVERY_RUNNING
,
5417 wait_event(mddev
->sb_wait
,
5418 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
5419 mddev_lock_nointr(mddev
);
5421 mutex_lock(&mddev
->open_mutex
);
5422 if ((mddev
->pers
&& atomic_read(&mddev
->openers
) > !!bdev
) ||
5423 mddev
->sync_thread
||
5424 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
5425 (bdev
&& !test_bit(MD_STILL_CLOSED
, &mddev
->flags
))) {
5426 printk("md: %s still in use.\n",mdname(mddev
));
5428 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5429 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5430 md_wakeup_thread(mddev
->thread
);
5436 __md_stop_writes(mddev
);
5442 set_disk_ro(mddev
->gendisk
, 1);
5443 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5444 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5445 md_wakeup_thread(mddev
->thread
);
5446 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5450 mutex_unlock(&mddev
->open_mutex
);
5455 * 0 - completely stop and dis-assemble array
5456 * 2 - stop but do not disassemble array
5458 static int do_md_stop(struct mddev
*mddev
, int mode
,
5459 struct block_device
*bdev
)
5461 struct gendisk
*disk
= mddev
->gendisk
;
5462 struct md_rdev
*rdev
;
5465 if (!test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
)) {
5467 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5468 md_wakeup_thread(mddev
->thread
);
5470 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
5471 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5472 if (mddev
->sync_thread
)
5473 /* Thread might be blocked waiting for metadata update
5474 * which will now never happen */
5475 wake_up_process(mddev
->sync_thread
->tsk
);
5477 mddev_unlock(mddev
);
5478 wait_event(resync_wait
, (mddev
->sync_thread
== NULL
&&
5479 !test_bit(MD_RECOVERY_RUNNING
,
5480 &mddev
->recovery
)));
5481 mddev_lock_nointr(mddev
);
5483 mutex_lock(&mddev
->open_mutex
);
5484 if ((mddev
->pers
&& atomic_read(&mddev
->openers
) > !!bdev
) ||
5485 mddev
->sysfs_active
||
5486 mddev
->sync_thread
||
5487 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
5488 (bdev
&& !test_bit(MD_STILL_CLOSED
, &mddev
->flags
))) {
5489 printk("md: %s still in use.\n",mdname(mddev
));
5490 mutex_unlock(&mddev
->open_mutex
);
5492 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5493 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5494 md_wakeup_thread(mddev
->thread
);
5500 set_disk_ro(disk
, 0);
5502 __md_stop_writes(mddev
);
5504 mddev
->queue
->backing_dev_info
.congested_fn
= NULL
;
5506 /* tell userspace to handle 'inactive' */
5507 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5509 rdev_for_each(rdev
, mddev
)
5510 if (rdev
->raid_disk
>= 0)
5511 sysfs_unlink_rdev(mddev
, rdev
);
5513 set_capacity(disk
, 0);
5514 mutex_unlock(&mddev
->open_mutex
);
5516 revalidate_disk(disk
);
5521 mutex_unlock(&mddev
->open_mutex
);
5523 * Free resources if final stop
5526 printk(KERN_INFO
"md: %s stopped.\n", mdname(mddev
));
5528 bitmap_destroy(mddev
);
5529 if (mddev
->bitmap_info
.file
) {
5530 struct file
*f
= mddev
->bitmap_info
.file
;
5531 spin_lock(&mddev
->lock
);
5532 mddev
->bitmap_info
.file
= NULL
;
5533 spin_unlock(&mddev
->lock
);
5536 mddev
->bitmap_info
.offset
= 0;
5538 export_array(mddev
);
5541 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
5542 if (mddev
->hold_active
== UNTIL_STOP
)
5543 mddev
->hold_active
= 0;
5545 blk_integrity_unregister(disk
);
5546 md_new_event(mddev
);
5547 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5552 static void autorun_array(struct mddev
*mddev
)
5554 struct md_rdev
*rdev
;
5557 if (list_empty(&mddev
->disks
))
5560 printk(KERN_INFO
"md: running: ");
5562 rdev_for_each(rdev
, mddev
) {
5563 char b
[BDEVNAME_SIZE
];
5564 printk("<%s>", bdevname(rdev
->bdev
,b
));
5568 err
= do_md_run(mddev
);
5570 printk(KERN_WARNING
"md: do_md_run() returned %d\n", err
);
5571 do_md_stop(mddev
, 0, NULL
);
5576 * lets try to run arrays based on all disks that have arrived
5577 * until now. (those are in pending_raid_disks)
5579 * the method: pick the first pending disk, collect all disks with
5580 * the same UUID, remove all from the pending list and put them into
5581 * the 'same_array' list. Then order this list based on superblock
5582 * update time (freshest comes first), kick out 'old' disks and
5583 * compare superblocks. If everything's fine then run it.
5585 * If "unit" is allocated, then bump its reference count
5587 static void autorun_devices(int part
)
5589 struct md_rdev
*rdev0
, *rdev
, *tmp
;
5590 struct mddev
*mddev
;
5591 char b
[BDEVNAME_SIZE
];
5593 printk(KERN_INFO
"md: autorun ...\n");
5594 while (!list_empty(&pending_raid_disks
)) {
5597 LIST_HEAD(candidates
);
5598 rdev0
= list_entry(pending_raid_disks
.next
,
5599 struct md_rdev
, same_set
);
5601 printk(KERN_INFO
"md: considering %s ...\n",
5602 bdevname(rdev0
->bdev
,b
));
5603 INIT_LIST_HEAD(&candidates
);
5604 rdev_for_each_list(rdev
, tmp
, &pending_raid_disks
)
5605 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
5606 printk(KERN_INFO
"md: adding %s ...\n",
5607 bdevname(rdev
->bdev
,b
));
5608 list_move(&rdev
->same_set
, &candidates
);
5611 * now we have a set of devices, with all of them having
5612 * mostly sane superblocks. It's time to allocate the
5616 dev
= MKDEV(mdp_major
,
5617 rdev0
->preferred_minor
<< MdpMinorShift
);
5618 unit
= MINOR(dev
) >> MdpMinorShift
;
5620 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
5623 if (rdev0
->preferred_minor
!= unit
) {
5624 printk(KERN_INFO
"md: unit number in %s is bad: %d\n",
5625 bdevname(rdev0
->bdev
, b
), rdev0
->preferred_minor
);
5629 md_probe(dev
, NULL
, NULL
);
5630 mddev
= mddev_find(dev
);
5631 if (!mddev
|| !mddev
->gendisk
) {
5635 "md: cannot allocate memory for md drive.\n");
5638 if (mddev_lock(mddev
))
5639 printk(KERN_WARNING
"md: %s locked, cannot run\n",
5641 else if (mddev
->raid_disks
|| mddev
->major_version
5642 || !list_empty(&mddev
->disks
)) {
5644 "md: %s already running, cannot run %s\n",
5645 mdname(mddev
), bdevname(rdev0
->bdev
,b
));
5646 mddev_unlock(mddev
);
5648 printk(KERN_INFO
"md: created %s\n", mdname(mddev
));
5649 mddev
->persistent
= 1;
5650 rdev_for_each_list(rdev
, tmp
, &candidates
) {
5651 list_del_init(&rdev
->same_set
);
5652 if (bind_rdev_to_array(rdev
, mddev
))
5655 autorun_array(mddev
);
5656 mddev_unlock(mddev
);
5658 /* on success, candidates will be empty, on error
5661 rdev_for_each_list(rdev
, tmp
, &candidates
) {
5662 list_del_init(&rdev
->same_set
);
5667 printk(KERN_INFO
"md: ... autorun DONE.\n");
5669 #endif /* !MODULE */
5671 static int get_version(void __user
*arg
)
5675 ver
.major
= MD_MAJOR_VERSION
;
5676 ver
.minor
= MD_MINOR_VERSION
;
5677 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
5679 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
5685 static int get_array_info(struct mddev
*mddev
, void __user
*arg
)
5687 mdu_array_info_t info
;
5688 int nr
,working
,insync
,failed
,spare
;
5689 struct md_rdev
*rdev
;
5691 nr
= working
= insync
= failed
= spare
= 0;
5693 rdev_for_each_rcu(rdev
, mddev
) {
5695 if (test_bit(Faulty
, &rdev
->flags
))
5699 if (test_bit(In_sync
, &rdev
->flags
))
5707 info
.major_version
= mddev
->major_version
;
5708 info
.minor_version
= mddev
->minor_version
;
5709 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
5710 info
.ctime
= mddev
->ctime
;
5711 info
.level
= mddev
->level
;
5712 info
.size
= mddev
->dev_sectors
/ 2;
5713 if (info
.size
!= mddev
->dev_sectors
/ 2) /* overflow */
5716 info
.raid_disks
= mddev
->raid_disks
;
5717 info
.md_minor
= mddev
->md_minor
;
5718 info
.not_persistent
= !mddev
->persistent
;
5720 info
.utime
= mddev
->utime
;
5723 info
.state
= (1<<MD_SB_CLEAN
);
5724 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
5725 info
.state
|= (1<<MD_SB_BITMAP_PRESENT
);
5726 if (mddev_is_clustered(mddev
))
5727 info
.state
|= (1<<MD_SB_CLUSTERED
);
5728 info
.active_disks
= insync
;
5729 info
.working_disks
= working
;
5730 info
.failed_disks
= failed
;
5731 info
.spare_disks
= spare
;
5733 info
.layout
= mddev
->layout
;
5734 info
.chunk_size
= mddev
->chunk_sectors
<< 9;
5736 if (copy_to_user(arg
, &info
, sizeof(info
)))
5742 static int get_bitmap_file(struct mddev
*mddev
, void __user
* arg
)
5744 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
5748 file
= kzalloc(sizeof(*file
), GFP_NOIO
);
5753 spin_lock(&mddev
->lock
);
5754 /* bitmap enabled */
5755 if (mddev
->bitmap_info
.file
) {
5756 ptr
= file_path(mddev
->bitmap_info
.file
, file
->pathname
,
5757 sizeof(file
->pathname
));
5761 memmove(file
->pathname
, ptr
,
5762 sizeof(file
->pathname
)-(ptr
-file
->pathname
));
5764 spin_unlock(&mddev
->lock
);
5767 copy_to_user(arg
, file
, sizeof(*file
)))
5774 static int get_disk_info(struct mddev
*mddev
, void __user
* arg
)
5776 mdu_disk_info_t info
;
5777 struct md_rdev
*rdev
;
5779 if (copy_from_user(&info
, arg
, sizeof(info
)))
5783 rdev
= md_find_rdev_nr_rcu(mddev
, info
.number
);
5785 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
5786 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
5787 info
.raid_disk
= rdev
->raid_disk
;
5789 if (test_bit(Faulty
, &rdev
->flags
))
5790 info
.state
|= (1<<MD_DISK_FAULTY
);
5791 else if (test_bit(In_sync
, &rdev
->flags
)) {
5792 info
.state
|= (1<<MD_DISK_ACTIVE
);
5793 info
.state
|= (1<<MD_DISK_SYNC
);
5795 if (test_bit(WriteMostly
, &rdev
->flags
))
5796 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
5798 info
.major
= info
.minor
= 0;
5799 info
.raid_disk
= -1;
5800 info
.state
= (1<<MD_DISK_REMOVED
);
5804 if (copy_to_user(arg
, &info
, sizeof(info
)))
5810 static int add_new_disk(struct mddev
*mddev
, mdu_disk_info_t
*info
)
5812 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
5813 struct md_rdev
*rdev
;
5814 dev_t dev
= MKDEV(info
->major
,info
->minor
);
5816 if (mddev_is_clustered(mddev
) &&
5817 !(info
->state
& ((1 << MD_DISK_CLUSTER_ADD
) | (1 << MD_DISK_CANDIDATE
)))) {
5818 pr_err("%s: Cannot add to clustered mddev.\n",
5823 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
5826 if (!mddev
->raid_disks
) {
5828 /* expecting a device which has a superblock */
5829 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
5832 "md: md_import_device returned %ld\n",
5834 return PTR_ERR(rdev
);
5836 if (!list_empty(&mddev
->disks
)) {
5837 struct md_rdev
*rdev0
5838 = list_entry(mddev
->disks
.next
,
5839 struct md_rdev
, same_set
);
5840 err
= super_types
[mddev
->major_version
]
5841 .load_super(rdev
, rdev0
, mddev
->minor_version
);
5844 "md: %s has different UUID to %s\n",
5845 bdevname(rdev
->bdev
,b
),
5846 bdevname(rdev0
->bdev
,b2
));
5851 err
= bind_rdev_to_array(rdev
, mddev
);
5858 * add_new_disk can be used once the array is assembled
5859 * to add "hot spares". They must already have a superblock
5864 if (!mddev
->pers
->hot_add_disk
) {
5866 "%s: personality does not support diskops!\n",
5870 if (mddev
->persistent
)
5871 rdev
= md_import_device(dev
, mddev
->major_version
,
5872 mddev
->minor_version
);
5874 rdev
= md_import_device(dev
, -1, -1);
5877 "md: md_import_device returned %ld\n",
5879 return PTR_ERR(rdev
);
5881 /* set saved_raid_disk if appropriate */
5882 if (!mddev
->persistent
) {
5883 if (info
->state
& (1<<MD_DISK_SYNC
) &&
5884 info
->raid_disk
< mddev
->raid_disks
) {
5885 rdev
->raid_disk
= info
->raid_disk
;
5886 set_bit(In_sync
, &rdev
->flags
);
5887 clear_bit(Bitmap_sync
, &rdev
->flags
);
5889 rdev
->raid_disk
= -1;
5890 rdev
->saved_raid_disk
= rdev
->raid_disk
;
5892 super_types
[mddev
->major_version
].
5893 validate_super(mddev
, rdev
);
5894 if ((info
->state
& (1<<MD_DISK_SYNC
)) &&
5895 rdev
->raid_disk
!= info
->raid_disk
) {
5896 /* This was a hot-add request, but events doesn't
5897 * match, so reject it.
5903 clear_bit(In_sync
, &rdev
->flags
); /* just to be sure */
5904 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
5905 set_bit(WriteMostly
, &rdev
->flags
);
5907 clear_bit(WriteMostly
, &rdev
->flags
);
5910 * check whether the device shows up in other nodes
5912 if (mddev_is_clustered(mddev
)) {
5913 if (info
->state
& (1 << MD_DISK_CANDIDATE
)) {
5914 /* Through --cluster-confirm */
5915 set_bit(Candidate
, &rdev
->flags
);
5916 err
= md_cluster_ops
->new_disk_ack(mddev
, true);
5921 } else if (info
->state
& (1 << MD_DISK_CLUSTER_ADD
)) {
5922 /* --add initiated by this node */
5923 err
= md_cluster_ops
->add_new_disk_start(mddev
, rdev
);
5925 md_cluster_ops
->add_new_disk_finish(mddev
);
5932 rdev
->raid_disk
= -1;
5933 err
= bind_rdev_to_array(rdev
, mddev
);
5937 err
= add_bound_rdev(rdev
);
5938 if (mddev_is_clustered(mddev
) &&
5939 (info
->state
& (1 << MD_DISK_CLUSTER_ADD
)))
5940 md_cluster_ops
->add_new_disk_finish(mddev
);
5944 /* otherwise, add_new_disk is only allowed
5945 * for major_version==0 superblocks
5947 if (mddev
->major_version
!= 0) {
5948 printk(KERN_WARNING
"%s: ADD_NEW_DISK not supported\n",
5953 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
5955 rdev
= md_import_device(dev
, -1, 0);
5958 "md: error, md_import_device() returned %ld\n",
5960 return PTR_ERR(rdev
);
5962 rdev
->desc_nr
= info
->number
;
5963 if (info
->raid_disk
< mddev
->raid_disks
)
5964 rdev
->raid_disk
= info
->raid_disk
;
5966 rdev
->raid_disk
= -1;
5968 if (rdev
->raid_disk
< mddev
->raid_disks
)
5969 if (info
->state
& (1<<MD_DISK_SYNC
))
5970 set_bit(In_sync
, &rdev
->flags
);
5972 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
5973 set_bit(WriteMostly
, &rdev
->flags
);
5975 if (!mddev
->persistent
) {
5976 printk(KERN_INFO
"md: nonpersistent superblock ...\n");
5977 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
5979 rdev
->sb_start
= calc_dev_sboffset(rdev
);
5980 rdev
->sectors
= rdev
->sb_start
;
5982 err
= bind_rdev_to_array(rdev
, mddev
);
5992 static int hot_remove_disk(struct mddev
*mddev
, dev_t dev
)
5994 char b
[BDEVNAME_SIZE
];
5995 struct md_rdev
*rdev
;
5997 rdev
= find_rdev(mddev
, dev
);
6001 if (mddev_is_clustered(mddev
))
6002 md_cluster_ops
->metadata_update_start(mddev
);
6004 clear_bit(Blocked
, &rdev
->flags
);
6005 remove_and_add_spares(mddev
, rdev
);
6007 if (rdev
->raid_disk
>= 0)
6010 if (mddev_is_clustered(mddev
))
6011 md_cluster_ops
->remove_disk(mddev
, rdev
);
6013 md_kick_rdev_from_array(rdev
);
6014 md_update_sb(mddev
, 1);
6015 md_new_event(mddev
);
6017 if (mddev_is_clustered(mddev
))
6018 md_cluster_ops
->metadata_update_finish(mddev
);
6022 if (mddev_is_clustered(mddev
))
6023 md_cluster_ops
->metadata_update_cancel(mddev
);
6024 printk(KERN_WARNING
"md: cannot remove active disk %s from %s ...\n",
6025 bdevname(rdev
->bdev
,b
), mdname(mddev
));
6029 static int hot_add_disk(struct mddev
*mddev
, dev_t dev
)
6031 char b
[BDEVNAME_SIZE
];
6033 struct md_rdev
*rdev
;
6038 if (mddev
->major_version
!= 0) {
6039 printk(KERN_WARNING
"%s: HOT_ADD may only be used with"
6040 " version-0 superblocks.\n",
6044 if (!mddev
->pers
->hot_add_disk
) {
6046 "%s: personality does not support diskops!\n",
6051 rdev
= md_import_device(dev
, -1, 0);
6054 "md: error, md_import_device() returned %ld\n",
6059 if (mddev
->persistent
)
6060 rdev
->sb_start
= calc_dev_sboffset(rdev
);
6062 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
6064 rdev
->sectors
= rdev
->sb_start
;
6066 if (test_bit(Faulty
, &rdev
->flags
)) {
6068 "md: can not hot-add faulty %s disk to %s!\n",
6069 bdevname(rdev
->bdev
,b
), mdname(mddev
));
6074 if (mddev_is_clustered(mddev
))
6075 md_cluster_ops
->metadata_update_start(mddev
);
6076 clear_bit(In_sync
, &rdev
->flags
);
6078 rdev
->saved_raid_disk
= -1;
6079 err
= bind_rdev_to_array(rdev
, mddev
);
6081 goto abort_clustered
;
6084 * The rest should better be atomic, we can have disk failures
6085 * noticed in interrupt contexts ...
6088 rdev
->raid_disk
= -1;
6090 md_update_sb(mddev
, 1);
6092 if (mddev_is_clustered(mddev
))
6093 md_cluster_ops
->metadata_update_finish(mddev
);
6095 * Kick recovery, maybe this spare has to be added to the
6096 * array immediately.
6098 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6099 md_wakeup_thread(mddev
->thread
);
6100 md_new_event(mddev
);
6104 if (mddev_is_clustered(mddev
))
6105 md_cluster_ops
->metadata_update_cancel(mddev
);
6111 static int set_bitmap_file(struct mddev
*mddev
, int fd
)
6116 if (!mddev
->pers
->quiesce
|| !mddev
->thread
)
6118 if (mddev
->recovery
|| mddev
->sync_thread
)
6120 /* we should be able to change the bitmap.. */
6124 struct inode
*inode
;
6127 if (mddev
->bitmap
|| mddev
->bitmap_info
.file
)
6128 return -EEXIST
; /* cannot add when bitmap is present */
6132 printk(KERN_ERR
"%s: error: failed to get bitmap file\n",
6137 inode
= f
->f_mapping
->host
;
6138 if (!S_ISREG(inode
->i_mode
)) {
6139 printk(KERN_ERR
"%s: error: bitmap file must be a regular file\n",
6142 } else if (!(f
->f_mode
& FMODE_WRITE
)) {
6143 printk(KERN_ERR
"%s: error: bitmap file must open for write\n",
6146 } else if (atomic_read(&inode
->i_writecount
) != 1) {
6147 printk(KERN_ERR
"%s: error: bitmap file is already in use\n",
6155 mddev
->bitmap_info
.file
= f
;
6156 mddev
->bitmap_info
.offset
= 0; /* file overrides offset */
6157 } else if (mddev
->bitmap
== NULL
)
6158 return -ENOENT
; /* cannot remove what isn't there */
6161 mddev
->pers
->quiesce(mddev
, 1);
6163 struct bitmap
*bitmap
;
6165 bitmap
= bitmap_create(mddev
, -1);
6166 if (!IS_ERR(bitmap
)) {
6167 mddev
->bitmap
= bitmap
;
6168 err
= bitmap_load(mddev
);
6170 err
= PTR_ERR(bitmap
);
6172 if (fd
< 0 || err
) {
6173 bitmap_destroy(mddev
);
6174 fd
= -1; /* make sure to put the file */
6176 mddev
->pers
->quiesce(mddev
, 0);
6179 struct file
*f
= mddev
->bitmap_info
.file
;
6181 spin_lock(&mddev
->lock
);
6182 mddev
->bitmap_info
.file
= NULL
;
6183 spin_unlock(&mddev
->lock
);
6192 * set_array_info is used two different ways
6193 * The original usage is when creating a new array.
6194 * In this usage, raid_disks is > 0 and it together with
6195 * level, size, not_persistent,layout,chunksize determine the
6196 * shape of the array.
6197 * This will always create an array with a type-0.90.0 superblock.
6198 * The newer usage is when assembling an array.
6199 * In this case raid_disks will be 0, and the major_version field is
6200 * use to determine which style super-blocks are to be found on the devices.
6201 * The minor and patch _version numbers are also kept incase the
6202 * super_block handler wishes to interpret them.
6204 static int set_array_info(struct mddev
*mddev
, mdu_array_info_t
*info
)
6207 if (info
->raid_disks
== 0) {
6208 /* just setting version number for superblock loading */
6209 if (info
->major_version
< 0 ||
6210 info
->major_version
>= ARRAY_SIZE(super_types
) ||
6211 super_types
[info
->major_version
].name
== NULL
) {
6212 /* maybe try to auto-load a module? */
6214 "md: superblock version %d not known\n",
6215 info
->major_version
);
6218 mddev
->major_version
= info
->major_version
;
6219 mddev
->minor_version
= info
->minor_version
;
6220 mddev
->patch_version
= info
->patch_version
;
6221 mddev
->persistent
= !info
->not_persistent
;
6222 /* ensure mddev_put doesn't delete this now that there
6223 * is some minimal configuration.
6225 mddev
->ctime
= get_seconds();
6228 mddev
->major_version
= MD_MAJOR_VERSION
;
6229 mddev
->minor_version
= MD_MINOR_VERSION
;
6230 mddev
->patch_version
= MD_PATCHLEVEL_VERSION
;
6231 mddev
->ctime
= get_seconds();
6233 mddev
->level
= info
->level
;
6234 mddev
->clevel
[0] = 0;
6235 mddev
->dev_sectors
= 2 * (sector_t
)info
->size
;
6236 mddev
->raid_disks
= info
->raid_disks
;
6237 /* don't set md_minor, it is determined by which /dev/md* was
6240 if (info
->state
& (1<<MD_SB_CLEAN
))
6241 mddev
->recovery_cp
= MaxSector
;
6243 mddev
->recovery_cp
= 0;
6244 mddev
->persistent
= ! info
->not_persistent
;
6245 mddev
->external
= 0;
6247 mddev
->layout
= info
->layout
;
6248 mddev
->chunk_sectors
= info
->chunk_size
>> 9;
6250 mddev
->max_disks
= MD_SB_DISKS
;
6252 if (mddev
->persistent
)
6254 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
6256 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
6257 mddev
->bitmap_info
.default_space
= 64*2 - (MD_SB_BYTES
>> 9);
6258 mddev
->bitmap_info
.offset
= 0;
6260 mddev
->reshape_position
= MaxSector
;
6263 * Generate a 128 bit UUID
6265 get_random_bytes(mddev
->uuid
, 16);
6267 mddev
->new_level
= mddev
->level
;
6268 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
6269 mddev
->new_layout
= mddev
->layout
;
6270 mddev
->delta_disks
= 0;
6271 mddev
->reshape_backwards
= 0;
6276 void md_set_array_sectors(struct mddev
*mddev
, sector_t array_sectors
)
6278 WARN(!mddev_is_locked(mddev
), "%s: unlocked mddev!\n", __func__
);
6280 if (mddev
->external_size
)
6283 mddev
->array_sectors
= array_sectors
;
6285 EXPORT_SYMBOL(md_set_array_sectors
);
6287 static int update_size(struct mddev
*mddev
, sector_t num_sectors
)
6289 struct md_rdev
*rdev
;
6291 int fit
= (num_sectors
== 0);
6293 if (mddev
->pers
->resize
== NULL
)
6295 /* The "num_sectors" is the number of sectors of each device that
6296 * is used. This can only make sense for arrays with redundancy.
6297 * linear and raid0 always use whatever space is available. We can only
6298 * consider changing this number if no resync or reconstruction is
6299 * happening, and if the new size is acceptable. It must fit before the
6300 * sb_start or, if that is <data_offset, it must fit before the size
6301 * of each device. If num_sectors is zero, we find the largest size
6304 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
6310 rdev_for_each(rdev
, mddev
) {
6311 sector_t avail
= rdev
->sectors
;
6313 if (fit
&& (num_sectors
== 0 || num_sectors
> avail
))
6314 num_sectors
= avail
;
6315 if (avail
< num_sectors
)
6318 rv
= mddev
->pers
->resize(mddev
, num_sectors
);
6320 revalidate_disk(mddev
->gendisk
);
6324 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
)
6327 struct md_rdev
*rdev
;
6328 /* change the number of raid disks */
6329 if (mddev
->pers
->check_reshape
== NULL
)
6333 if (raid_disks
<= 0 ||
6334 (mddev
->max_disks
&& raid_disks
>= mddev
->max_disks
))
6336 if (mddev
->sync_thread
||
6337 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
6338 mddev
->reshape_position
!= MaxSector
)
6341 rdev_for_each(rdev
, mddev
) {
6342 if (mddev
->raid_disks
< raid_disks
&&
6343 rdev
->data_offset
< rdev
->new_data_offset
)
6345 if (mddev
->raid_disks
> raid_disks
&&
6346 rdev
->data_offset
> rdev
->new_data_offset
)
6350 mddev
->delta_disks
= raid_disks
- mddev
->raid_disks
;
6351 if (mddev
->delta_disks
< 0)
6352 mddev
->reshape_backwards
= 1;
6353 else if (mddev
->delta_disks
> 0)
6354 mddev
->reshape_backwards
= 0;
6356 rv
= mddev
->pers
->check_reshape(mddev
);
6358 mddev
->delta_disks
= 0;
6359 mddev
->reshape_backwards
= 0;
6365 * update_array_info is used to change the configuration of an
6367 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
6368 * fields in the info are checked against the array.
6369 * Any differences that cannot be handled will cause an error.
6370 * Normally, only one change can be managed at a time.
6372 static int update_array_info(struct mddev
*mddev
, mdu_array_info_t
*info
)
6378 /* calculate expected state,ignoring low bits */
6379 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
6380 state
|= (1 << MD_SB_BITMAP_PRESENT
);
6382 if (mddev
->major_version
!= info
->major_version
||
6383 mddev
->minor_version
!= info
->minor_version
||
6384 /* mddev->patch_version != info->patch_version || */
6385 mddev
->ctime
!= info
->ctime
||
6386 mddev
->level
!= info
->level
||
6387 /* mddev->layout != info->layout || */
6388 mddev
->persistent
!= !info
->not_persistent
||
6389 mddev
->chunk_sectors
!= info
->chunk_size
>> 9 ||
6390 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
6391 ((state
^info
->state
) & 0xfffffe00)
6394 /* Check there is only one change */
6395 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
6397 if (mddev
->raid_disks
!= info
->raid_disks
)
6399 if (mddev
->layout
!= info
->layout
)
6401 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
))
6408 if (mddev
->layout
!= info
->layout
) {
6410 * we don't need to do anything at the md level, the
6411 * personality will take care of it all.
6413 if (mddev
->pers
->check_reshape
== NULL
)
6416 mddev
->new_layout
= info
->layout
;
6417 rv
= mddev
->pers
->check_reshape(mddev
);
6419 mddev
->new_layout
= mddev
->layout
;
6423 if (mddev_is_clustered(mddev
))
6424 md_cluster_ops
->metadata_update_start(mddev
);
6425 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
6426 rv
= update_size(mddev
, (sector_t
)info
->size
* 2);
6428 if (mddev
->raid_disks
!= info
->raid_disks
)
6429 rv
= update_raid_disks(mddev
, info
->raid_disks
);
6431 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) {
6432 if (mddev
->pers
->quiesce
== NULL
|| mddev
->thread
== NULL
) {
6436 if (mddev
->recovery
|| mddev
->sync_thread
) {
6440 if (info
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
6441 struct bitmap
*bitmap
;
6442 /* add the bitmap */
6443 if (mddev
->bitmap
) {
6447 if (mddev
->bitmap_info
.default_offset
== 0) {
6451 mddev
->bitmap_info
.offset
=
6452 mddev
->bitmap_info
.default_offset
;
6453 mddev
->bitmap_info
.space
=
6454 mddev
->bitmap_info
.default_space
;
6455 mddev
->pers
->quiesce(mddev
, 1);
6456 bitmap
= bitmap_create(mddev
, -1);
6457 if (!IS_ERR(bitmap
)) {
6458 mddev
->bitmap
= bitmap
;
6459 rv
= bitmap_load(mddev
);
6461 rv
= PTR_ERR(bitmap
);
6463 bitmap_destroy(mddev
);
6464 mddev
->pers
->quiesce(mddev
, 0);
6466 /* remove the bitmap */
6467 if (!mddev
->bitmap
) {
6471 if (mddev
->bitmap
->storage
.file
) {
6475 mddev
->pers
->quiesce(mddev
, 1);
6476 bitmap_destroy(mddev
);
6477 mddev
->pers
->quiesce(mddev
, 0);
6478 mddev
->bitmap_info
.offset
= 0;
6481 md_update_sb(mddev
, 1);
6482 if (mddev_is_clustered(mddev
))
6483 md_cluster_ops
->metadata_update_finish(mddev
);
6486 if (mddev_is_clustered(mddev
))
6487 md_cluster_ops
->metadata_update_cancel(mddev
);
6491 static int set_disk_faulty(struct mddev
*mddev
, dev_t dev
)
6493 struct md_rdev
*rdev
;
6496 if (mddev
->pers
== NULL
)
6500 rdev
= find_rdev_rcu(mddev
, dev
);
6504 md_error(mddev
, rdev
);
6505 if (!test_bit(Faulty
, &rdev
->flags
))
6513 * We have a problem here : there is no easy way to give a CHS
6514 * virtual geometry. We currently pretend that we have a 2 heads
6515 * 4 sectors (with a BIG number of cylinders...). This drives
6516 * dosfs just mad... ;-)
6518 static int md_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
6520 struct mddev
*mddev
= bdev
->bd_disk
->private_data
;
6524 geo
->cylinders
= mddev
->array_sectors
/ 8;
6528 static inline bool md_ioctl_valid(unsigned int cmd
)
6533 case GET_ARRAY_INFO
:
6534 case GET_BITMAP_FILE
:
6537 case HOT_REMOVE_DISK
:
6540 case RESTART_ARRAY_RW
:
6542 case SET_ARRAY_INFO
:
6543 case SET_BITMAP_FILE
:
6544 case SET_DISK_FAULTY
:
6547 case CLUSTERED_DISK_NACK
:
6554 static int md_ioctl(struct block_device
*bdev
, fmode_t mode
,
6555 unsigned int cmd
, unsigned long arg
)
6558 void __user
*argp
= (void __user
*)arg
;
6559 struct mddev
*mddev
= NULL
;
6562 if (!md_ioctl_valid(cmd
))
6567 case GET_ARRAY_INFO
:
6571 if (!capable(CAP_SYS_ADMIN
))
6576 * Commands dealing with the RAID driver but not any
6581 err
= get_version(argp
);
6587 autostart_arrays(arg
);
6594 * Commands creating/starting a new array:
6597 mddev
= bdev
->bd_disk
->private_data
;
6604 /* Some actions do not requires the mutex */
6606 case GET_ARRAY_INFO
:
6607 if (!mddev
->raid_disks
&& !mddev
->external
)
6610 err
= get_array_info(mddev
, argp
);
6614 if (!mddev
->raid_disks
&& !mddev
->external
)
6617 err
= get_disk_info(mddev
, argp
);
6620 case SET_DISK_FAULTY
:
6621 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
6624 case GET_BITMAP_FILE
:
6625 err
= get_bitmap_file(mddev
, argp
);
6630 if (cmd
== ADD_NEW_DISK
)
6631 /* need to ensure md_delayed_delete() has completed */
6632 flush_workqueue(md_misc_wq
);
6634 if (cmd
== HOT_REMOVE_DISK
)
6635 /* need to ensure recovery thread has run */
6636 wait_event_interruptible_timeout(mddev
->sb_wait
,
6637 !test_bit(MD_RECOVERY_NEEDED
,
6639 msecs_to_jiffies(5000));
6640 if (cmd
== STOP_ARRAY
|| cmd
== STOP_ARRAY_RO
) {
6641 /* Need to flush page cache, and ensure no-one else opens
6644 mutex_lock(&mddev
->open_mutex
);
6645 if (mddev
->pers
&& atomic_read(&mddev
->openers
) > 1) {
6646 mutex_unlock(&mddev
->open_mutex
);
6650 set_bit(MD_STILL_CLOSED
, &mddev
->flags
);
6651 mutex_unlock(&mddev
->open_mutex
);
6652 sync_blockdev(bdev
);
6654 err
= mddev_lock(mddev
);
6657 "md: ioctl lock interrupted, reason %d, cmd %d\n",
6662 if (cmd
== SET_ARRAY_INFO
) {
6663 mdu_array_info_t info
;
6665 memset(&info
, 0, sizeof(info
));
6666 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
6671 err
= update_array_info(mddev
, &info
);
6673 printk(KERN_WARNING
"md: couldn't update"
6674 " array info. %d\n", err
);
6679 if (!list_empty(&mddev
->disks
)) {
6681 "md: array %s already has disks!\n",
6686 if (mddev
->raid_disks
) {
6688 "md: array %s already initialised!\n",
6693 err
= set_array_info(mddev
, &info
);
6695 printk(KERN_WARNING
"md: couldn't set"
6696 " array info. %d\n", err
);
6703 * Commands querying/configuring an existing array:
6705 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
6706 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
6707 if ((!mddev
->raid_disks
&& !mddev
->external
)
6708 && cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
6709 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
6710 && cmd
!= GET_BITMAP_FILE
) {
6716 * Commands even a read-only array can execute:
6719 case RESTART_ARRAY_RW
:
6720 err
= restart_array(mddev
);
6724 err
= do_md_stop(mddev
, 0, bdev
);
6728 err
= md_set_readonly(mddev
, bdev
);
6731 case HOT_REMOVE_DISK
:
6732 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
6736 /* We can support ADD_NEW_DISK on read-only arrays
6737 * on if we are re-adding a preexisting device.
6738 * So require mddev->pers and MD_DISK_SYNC.
6741 mdu_disk_info_t info
;
6742 if (copy_from_user(&info
, argp
, sizeof(info
)))
6744 else if (!(info
.state
& (1<<MD_DISK_SYNC
)))
6745 /* Need to clear read-only for this */
6748 err
= add_new_disk(mddev
, &info
);
6754 if (get_user(ro
, (int __user
*)(arg
))) {
6760 /* if the bdev is going readonly the value of mddev->ro
6761 * does not matter, no writes are coming
6766 /* are we are already prepared for writes? */
6770 /* transitioning to readauto need only happen for
6771 * arrays that call md_write_start
6774 err
= restart_array(mddev
);
6777 set_disk_ro(mddev
->gendisk
, 0);
6784 * The remaining ioctls are changing the state of the
6785 * superblock, so we do not allow them on read-only arrays.
6787 if (mddev
->ro
&& mddev
->pers
) {
6788 if (mddev
->ro
== 2) {
6790 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6791 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6792 /* mddev_unlock will wake thread */
6793 /* If a device failed while we were read-only, we
6794 * need to make sure the metadata is updated now.
6796 if (test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
6797 mddev_unlock(mddev
);
6798 wait_event(mddev
->sb_wait
,
6799 !test_bit(MD_CHANGE_DEVS
, &mddev
->flags
) &&
6800 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
6801 mddev_lock_nointr(mddev
);
6812 mdu_disk_info_t info
;
6813 if (copy_from_user(&info
, argp
, sizeof(info
)))
6816 err
= add_new_disk(mddev
, &info
);
6820 case CLUSTERED_DISK_NACK
:
6821 if (mddev_is_clustered(mddev
))
6822 md_cluster_ops
->new_disk_ack(mddev
, false);
6828 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
6832 err
= do_md_run(mddev
);
6835 case SET_BITMAP_FILE
:
6836 err
= set_bitmap_file(mddev
, (int)arg
);
6845 if (mddev
->hold_active
== UNTIL_IOCTL
&&
6847 mddev
->hold_active
= 0;
6848 mddev_unlock(mddev
);
6852 #ifdef CONFIG_COMPAT
6853 static int md_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
6854 unsigned int cmd
, unsigned long arg
)
6857 case HOT_REMOVE_DISK
:
6859 case SET_DISK_FAULTY
:
6860 case SET_BITMAP_FILE
:
6861 /* These take in integer arg, do not convert */
6864 arg
= (unsigned long)compat_ptr(arg
);
6868 return md_ioctl(bdev
, mode
, cmd
, arg
);
6870 #endif /* CONFIG_COMPAT */
6872 static int md_open(struct block_device
*bdev
, fmode_t mode
)
6875 * Succeed if we can lock the mddev, which confirms that
6876 * it isn't being stopped right now.
6878 struct mddev
*mddev
= mddev_find(bdev
->bd_dev
);
6884 if (mddev
->gendisk
!= bdev
->bd_disk
) {
6885 /* we are racing with mddev_put which is discarding this
6889 /* Wait until bdev->bd_disk is definitely gone */
6890 flush_workqueue(md_misc_wq
);
6891 /* Then retry the open from the top */
6892 return -ERESTARTSYS
;
6894 BUG_ON(mddev
!= bdev
->bd_disk
->private_data
);
6896 if ((err
= mutex_lock_interruptible(&mddev
->open_mutex
)))
6900 atomic_inc(&mddev
->openers
);
6901 clear_bit(MD_STILL_CLOSED
, &mddev
->flags
);
6902 mutex_unlock(&mddev
->open_mutex
);
6904 check_disk_change(bdev
);
6909 static void md_release(struct gendisk
*disk
, fmode_t mode
)
6911 struct mddev
*mddev
= disk
->private_data
;
6914 atomic_dec(&mddev
->openers
);
6918 static int md_media_changed(struct gendisk
*disk
)
6920 struct mddev
*mddev
= disk
->private_data
;
6922 return mddev
->changed
;
6925 static int md_revalidate(struct gendisk
*disk
)
6927 struct mddev
*mddev
= disk
->private_data
;
6932 static const struct block_device_operations md_fops
=
6934 .owner
= THIS_MODULE
,
6936 .release
= md_release
,
6938 #ifdef CONFIG_COMPAT
6939 .compat_ioctl
= md_compat_ioctl
,
6941 .getgeo
= md_getgeo
,
6942 .media_changed
= md_media_changed
,
6943 .revalidate_disk
= md_revalidate
,
6946 static int md_thread(void *arg
)
6948 struct md_thread
*thread
= arg
;
6951 * md_thread is a 'system-thread', it's priority should be very
6952 * high. We avoid resource deadlocks individually in each
6953 * raid personality. (RAID5 does preallocation) We also use RR and
6954 * the very same RT priority as kswapd, thus we will never get
6955 * into a priority inversion deadlock.
6957 * we definitely have to have equal or higher priority than
6958 * bdflush, otherwise bdflush will deadlock if there are too
6959 * many dirty RAID5 blocks.
6962 allow_signal(SIGKILL
);
6963 while (!kthread_should_stop()) {
6965 /* We need to wait INTERRUPTIBLE so that
6966 * we don't add to the load-average.
6967 * That means we need to be sure no signals are
6970 if (signal_pending(current
))
6971 flush_signals(current
);
6973 wait_event_interruptible_timeout
6975 test_bit(THREAD_WAKEUP
, &thread
->flags
)
6976 || kthread_should_stop(),
6979 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
6980 if (!kthread_should_stop())
6981 thread
->run(thread
);
6987 void md_wakeup_thread(struct md_thread
*thread
)
6990 pr_debug("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
6991 set_bit(THREAD_WAKEUP
, &thread
->flags
);
6992 wake_up(&thread
->wqueue
);
6995 EXPORT_SYMBOL(md_wakeup_thread
);
6997 struct md_thread
*md_register_thread(void (*run
) (struct md_thread
*),
6998 struct mddev
*mddev
, const char *name
)
7000 struct md_thread
*thread
;
7002 thread
= kzalloc(sizeof(struct md_thread
), GFP_KERNEL
);
7006 init_waitqueue_head(&thread
->wqueue
);
7009 thread
->mddev
= mddev
;
7010 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
7011 thread
->tsk
= kthread_run(md_thread
, thread
,
7013 mdname(thread
->mddev
),
7015 if (IS_ERR(thread
->tsk
)) {
7021 EXPORT_SYMBOL(md_register_thread
);
7023 void md_unregister_thread(struct md_thread
**threadp
)
7025 struct md_thread
*thread
= *threadp
;
7028 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread
->tsk
));
7029 /* Locking ensures that mddev_unlock does not wake_up a
7030 * non-existent thread
7032 spin_lock(&pers_lock
);
7034 spin_unlock(&pers_lock
);
7036 kthread_stop(thread
->tsk
);
7039 EXPORT_SYMBOL(md_unregister_thread
);
7041 void md_error(struct mddev
*mddev
, struct md_rdev
*rdev
)
7043 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
7046 if (!mddev
->pers
|| !mddev
->pers
->error_handler
)
7048 mddev
->pers
->error_handler(mddev
,rdev
);
7049 if (mddev
->degraded
)
7050 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7051 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
7052 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7053 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7054 md_wakeup_thread(mddev
->thread
);
7055 if (mddev
->event_work
.func
)
7056 queue_work(md_misc_wq
, &mddev
->event_work
);
7057 md_new_event_inintr(mddev
);
7059 EXPORT_SYMBOL(md_error
);
7061 /* seq_file implementation /proc/mdstat */
7063 static void status_unused(struct seq_file
*seq
)
7066 struct md_rdev
*rdev
;
7068 seq_printf(seq
, "unused devices: ");
7070 list_for_each_entry(rdev
, &pending_raid_disks
, same_set
) {
7071 char b
[BDEVNAME_SIZE
];
7073 seq_printf(seq
, "%s ",
7074 bdevname(rdev
->bdev
,b
));
7077 seq_printf(seq
, "<none>");
7079 seq_printf(seq
, "\n");
7082 static int status_resync(struct seq_file
*seq
, struct mddev
*mddev
)
7084 sector_t max_sectors
, resync
, res
;
7085 unsigned long dt
, db
;
7088 unsigned int per_milli
;
7090 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
7091 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
7092 max_sectors
= mddev
->resync_max_sectors
;
7094 max_sectors
= mddev
->dev_sectors
;
7096 resync
= mddev
->curr_resync
;
7098 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
7099 /* Still cleaning up */
7100 resync
= max_sectors
;
7102 resync
-= atomic_read(&mddev
->recovery_active
);
7105 if (mddev
->recovery_cp
< MaxSector
) {
7106 seq_printf(seq
, "\tresync=PENDING");
7112 seq_printf(seq
, "\tresync=DELAYED");
7116 WARN_ON(max_sectors
== 0);
7117 /* Pick 'scale' such that (resync>>scale)*1000 will fit
7118 * in a sector_t, and (max_sectors>>scale) will fit in a
7119 * u32, as those are the requirements for sector_div.
7120 * Thus 'scale' must be at least 10
7123 if (sizeof(sector_t
) > sizeof(unsigned long)) {
7124 while ( max_sectors
/2 > (1ULL<<(scale
+32)))
7127 res
= (resync
>>scale
)*1000;
7128 sector_div(res
, (u32
)((max_sectors
>>scale
)+1));
7132 int i
, x
= per_milli
/50, y
= 20-x
;
7133 seq_printf(seq
, "[");
7134 for (i
= 0; i
< x
; i
++)
7135 seq_printf(seq
, "=");
7136 seq_printf(seq
, ">");
7137 for (i
= 0; i
< y
; i
++)
7138 seq_printf(seq
, ".");
7139 seq_printf(seq
, "] ");
7141 seq_printf(seq
, " %s =%3u.%u%% (%llu/%llu)",
7142 (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)?
7144 (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)?
7146 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
7147 "resync" : "recovery"))),
7148 per_milli
/10, per_milli
% 10,
7149 (unsigned long long) resync
/2,
7150 (unsigned long long) max_sectors
/2);
7153 * dt: time from mark until now
7154 * db: blocks written from mark until now
7155 * rt: remaining time
7157 * rt is a sector_t, so could be 32bit or 64bit.
7158 * So we divide before multiply in case it is 32bit and close
7160 * We scale the divisor (db) by 32 to avoid losing precision
7161 * near the end of resync when the number of remaining sectors
7163 * We then divide rt by 32 after multiplying by db to compensate.
7164 * The '+1' avoids division by zero if db is very small.
7166 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
7168 db
= (mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
))
7169 - mddev
->resync_mark_cnt
;
7171 rt
= max_sectors
- resync
; /* number of remaining sectors */
7172 sector_div(rt
, db
/32+1);
7176 seq_printf(seq
, " finish=%lu.%lumin", (unsigned long)rt
/ 60,
7177 ((unsigned long)rt
% 60)/6);
7179 seq_printf(seq
, " speed=%ldK/sec", db
/2/dt
);
7183 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
7185 struct list_head
*tmp
;
7187 struct mddev
*mddev
;
7195 spin_lock(&all_mddevs_lock
);
7196 list_for_each(tmp
,&all_mddevs
)
7198 mddev
= list_entry(tmp
, struct mddev
, all_mddevs
);
7200 spin_unlock(&all_mddevs_lock
);
7203 spin_unlock(&all_mddevs_lock
);
7205 return (void*)2;/* tail */
7209 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
7211 struct list_head
*tmp
;
7212 struct mddev
*next_mddev
, *mddev
= v
;
7218 spin_lock(&all_mddevs_lock
);
7220 tmp
= all_mddevs
.next
;
7222 tmp
= mddev
->all_mddevs
.next
;
7223 if (tmp
!= &all_mddevs
)
7224 next_mddev
= mddev_get(list_entry(tmp
,struct mddev
,all_mddevs
));
7226 next_mddev
= (void*)2;
7229 spin_unlock(&all_mddevs_lock
);
7237 static void md_seq_stop(struct seq_file
*seq
, void *v
)
7239 struct mddev
*mddev
= v
;
7241 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
7245 static int md_seq_show(struct seq_file
*seq
, void *v
)
7247 struct mddev
*mddev
= v
;
7249 struct md_rdev
*rdev
;
7251 if (v
== (void*)1) {
7252 struct md_personality
*pers
;
7253 seq_printf(seq
, "Personalities : ");
7254 spin_lock(&pers_lock
);
7255 list_for_each_entry(pers
, &pers_list
, list
)
7256 seq_printf(seq
, "[%s] ", pers
->name
);
7258 spin_unlock(&pers_lock
);
7259 seq_printf(seq
, "\n");
7260 seq
->poll_event
= atomic_read(&md_event_count
);
7263 if (v
== (void*)2) {
7268 spin_lock(&mddev
->lock
);
7269 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
7270 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
7271 mddev
->pers
? "" : "in");
7274 seq_printf(seq
, " (read-only)");
7276 seq_printf(seq
, " (auto-read-only)");
7277 seq_printf(seq
, " %s", mddev
->pers
->name
);
7282 rdev_for_each_rcu(rdev
, mddev
) {
7283 char b
[BDEVNAME_SIZE
];
7284 seq_printf(seq
, " %s[%d]",
7285 bdevname(rdev
->bdev
,b
), rdev
->desc_nr
);
7286 if (test_bit(WriteMostly
, &rdev
->flags
))
7287 seq_printf(seq
, "(W)");
7288 if (test_bit(Faulty
, &rdev
->flags
)) {
7289 seq_printf(seq
, "(F)");
7292 if (rdev
->raid_disk
< 0)
7293 seq_printf(seq
, "(S)"); /* spare */
7294 if (test_bit(Replacement
, &rdev
->flags
))
7295 seq_printf(seq
, "(R)");
7296 sectors
+= rdev
->sectors
;
7300 if (!list_empty(&mddev
->disks
)) {
7302 seq_printf(seq
, "\n %llu blocks",
7303 (unsigned long long)
7304 mddev
->array_sectors
/ 2);
7306 seq_printf(seq
, "\n %llu blocks",
7307 (unsigned long long)sectors
/ 2);
7309 if (mddev
->persistent
) {
7310 if (mddev
->major_version
!= 0 ||
7311 mddev
->minor_version
!= 90) {
7312 seq_printf(seq
," super %d.%d",
7313 mddev
->major_version
,
7314 mddev
->minor_version
);
7316 } else if (mddev
->external
)
7317 seq_printf(seq
, " super external:%s",
7318 mddev
->metadata_type
);
7320 seq_printf(seq
, " super non-persistent");
7323 mddev
->pers
->status(seq
, mddev
);
7324 seq_printf(seq
, "\n ");
7325 if (mddev
->pers
->sync_request
) {
7326 if (status_resync(seq
, mddev
))
7327 seq_printf(seq
, "\n ");
7330 seq_printf(seq
, "\n ");
7332 bitmap_status(seq
, mddev
->bitmap
);
7334 seq_printf(seq
, "\n");
7336 spin_unlock(&mddev
->lock
);
7341 static const struct seq_operations md_seq_ops
= {
7342 .start
= md_seq_start
,
7343 .next
= md_seq_next
,
7344 .stop
= md_seq_stop
,
7345 .show
= md_seq_show
,
7348 static int md_seq_open(struct inode
*inode
, struct file
*file
)
7350 struct seq_file
*seq
;
7353 error
= seq_open(file
, &md_seq_ops
);
7357 seq
= file
->private_data
;
7358 seq
->poll_event
= atomic_read(&md_event_count
);
7362 static int md_unloading
;
7363 static unsigned int mdstat_poll(struct file
*filp
, poll_table
*wait
)
7365 struct seq_file
*seq
= filp
->private_data
;
7369 return POLLIN
|POLLRDNORM
|POLLERR
|POLLPRI
;
7370 poll_wait(filp
, &md_event_waiters
, wait
);
7372 /* always allow read */
7373 mask
= POLLIN
| POLLRDNORM
;
7375 if (seq
->poll_event
!= atomic_read(&md_event_count
))
7376 mask
|= POLLERR
| POLLPRI
;
7380 static const struct file_operations md_seq_fops
= {
7381 .owner
= THIS_MODULE
,
7382 .open
= md_seq_open
,
7384 .llseek
= seq_lseek
,
7385 .release
= seq_release_private
,
7386 .poll
= mdstat_poll
,
7389 int register_md_personality(struct md_personality
*p
)
7391 printk(KERN_INFO
"md: %s personality registered for level %d\n",
7393 spin_lock(&pers_lock
);
7394 list_add_tail(&p
->list
, &pers_list
);
7395 spin_unlock(&pers_lock
);
7398 EXPORT_SYMBOL(register_md_personality
);
7400 int unregister_md_personality(struct md_personality
*p
)
7402 printk(KERN_INFO
"md: %s personality unregistered\n", p
->name
);
7403 spin_lock(&pers_lock
);
7404 list_del_init(&p
->list
);
7405 spin_unlock(&pers_lock
);
7408 EXPORT_SYMBOL(unregister_md_personality
);
7410 int register_md_cluster_operations(struct md_cluster_operations
*ops
,
7411 struct module
*module
)
7414 spin_lock(&pers_lock
);
7415 if (md_cluster_ops
!= NULL
)
7418 md_cluster_ops
= ops
;
7419 md_cluster_mod
= module
;
7421 spin_unlock(&pers_lock
);
7424 EXPORT_SYMBOL(register_md_cluster_operations
);
7426 int unregister_md_cluster_operations(void)
7428 spin_lock(&pers_lock
);
7429 md_cluster_ops
= NULL
;
7430 spin_unlock(&pers_lock
);
7433 EXPORT_SYMBOL(unregister_md_cluster_operations
);
7435 int md_setup_cluster(struct mddev
*mddev
, int nodes
)
7439 err
= request_module("md-cluster");
7441 pr_err("md-cluster module not found.\n");
7445 spin_lock(&pers_lock
);
7446 if (!md_cluster_ops
|| !try_module_get(md_cluster_mod
)) {
7447 spin_unlock(&pers_lock
);
7450 spin_unlock(&pers_lock
);
7452 return md_cluster_ops
->join(mddev
, nodes
);
7455 void md_cluster_stop(struct mddev
*mddev
)
7457 if (!md_cluster_ops
)
7459 md_cluster_ops
->leave(mddev
);
7460 module_put(md_cluster_mod
);
7463 static int is_mddev_idle(struct mddev
*mddev
, int init
)
7465 struct md_rdev
*rdev
;
7471 rdev_for_each_rcu(rdev
, mddev
) {
7472 struct gendisk
*disk
= rdev
->bdev
->bd_contains
->bd_disk
;
7473 curr_events
= (int)part_stat_read(&disk
->part0
, sectors
[0]) +
7474 (int)part_stat_read(&disk
->part0
, sectors
[1]) -
7475 atomic_read(&disk
->sync_io
);
7476 /* sync IO will cause sync_io to increase before the disk_stats
7477 * as sync_io is counted when a request starts, and
7478 * disk_stats is counted when it completes.
7479 * So resync activity will cause curr_events to be smaller than
7480 * when there was no such activity.
7481 * non-sync IO will cause disk_stat to increase without
7482 * increasing sync_io so curr_events will (eventually)
7483 * be larger than it was before. Once it becomes
7484 * substantially larger, the test below will cause
7485 * the array to appear non-idle, and resync will slow
7487 * If there is a lot of outstanding resync activity when
7488 * we set last_event to curr_events, then all that activity
7489 * completing might cause the array to appear non-idle
7490 * and resync will be slowed down even though there might
7491 * not have been non-resync activity. This will only
7492 * happen once though. 'last_events' will soon reflect
7493 * the state where there is little or no outstanding
7494 * resync requests, and further resync activity will
7495 * always make curr_events less than last_events.
7498 if (init
|| curr_events
- rdev
->last_events
> 64) {
7499 rdev
->last_events
= curr_events
;
7507 void md_done_sync(struct mddev
*mddev
, int blocks
, int ok
)
7509 /* another "blocks" (512byte) blocks have been synced */
7510 atomic_sub(blocks
, &mddev
->recovery_active
);
7511 wake_up(&mddev
->recovery_wait
);
7513 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7514 set_bit(MD_RECOVERY_ERROR
, &mddev
->recovery
);
7515 md_wakeup_thread(mddev
->thread
);
7516 // stop recovery, signal do_sync ....
7519 EXPORT_SYMBOL(md_done_sync
);
7521 /* md_write_start(mddev, bi)
7522 * If we need to update some array metadata (e.g. 'active' flag
7523 * in superblock) before writing, schedule a superblock update
7524 * and wait for it to complete.
7526 void md_write_start(struct mddev
*mddev
, struct bio
*bi
)
7529 if (bio_data_dir(bi
) != WRITE
)
7532 BUG_ON(mddev
->ro
== 1);
7533 if (mddev
->ro
== 2) {
7534 /* need to switch to read/write */
7536 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7537 md_wakeup_thread(mddev
->thread
);
7538 md_wakeup_thread(mddev
->sync_thread
);
7541 atomic_inc(&mddev
->writes_pending
);
7542 if (mddev
->safemode
== 1)
7543 mddev
->safemode
= 0;
7544 if (mddev
->in_sync
) {
7545 spin_lock(&mddev
->lock
);
7546 if (mddev
->in_sync
) {
7548 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7549 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
7550 md_wakeup_thread(mddev
->thread
);
7553 spin_unlock(&mddev
->lock
);
7556 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7557 wait_event(mddev
->sb_wait
,
7558 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
7560 EXPORT_SYMBOL(md_write_start
);
7562 void md_write_end(struct mddev
*mddev
)
7564 if (atomic_dec_and_test(&mddev
->writes_pending
)) {
7565 if (mddev
->safemode
== 2)
7566 md_wakeup_thread(mddev
->thread
);
7567 else if (mddev
->safemode_delay
)
7568 mod_timer(&mddev
->safemode_timer
, jiffies
+ mddev
->safemode_delay
);
7571 EXPORT_SYMBOL(md_write_end
);
7573 /* md_allow_write(mddev)
7574 * Calling this ensures that the array is marked 'active' so that writes
7575 * may proceed without blocking. It is important to call this before
7576 * attempting a GFP_KERNEL allocation while holding the mddev lock.
7577 * Must be called with mddev_lock held.
7579 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
7580 * is dropped, so return -EAGAIN after notifying userspace.
7582 int md_allow_write(struct mddev
*mddev
)
7588 if (!mddev
->pers
->sync_request
)
7591 spin_lock(&mddev
->lock
);
7592 if (mddev
->in_sync
) {
7594 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7595 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
7596 if (mddev
->safemode_delay
&&
7597 mddev
->safemode
== 0)
7598 mddev
->safemode
= 1;
7599 spin_unlock(&mddev
->lock
);
7600 if (mddev_is_clustered(mddev
))
7601 md_cluster_ops
->metadata_update_start(mddev
);
7602 md_update_sb(mddev
, 0);
7603 if (mddev_is_clustered(mddev
))
7604 md_cluster_ops
->metadata_update_finish(mddev
);
7605 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7607 spin_unlock(&mddev
->lock
);
7609 if (test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
7614 EXPORT_SYMBOL_GPL(md_allow_write
);
7616 #define SYNC_MARKS 10
7617 #define SYNC_MARK_STEP (3*HZ)
7618 #define UPDATE_FREQUENCY (5*60*HZ)
7619 void md_do_sync(struct md_thread
*thread
)
7621 struct mddev
*mddev
= thread
->mddev
;
7622 struct mddev
*mddev2
;
7623 unsigned int currspeed
= 0,
7625 sector_t max_sectors
,j
, io_sectors
, recovery_done
;
7626 unsigned long mark
[SYNC_MARKS
];
7627 unsigned long update_time
;
7628 sector_t mark_cnt
[SYNC_MARKS
];
7630 struct list_head
*tmp
;
7631 sector_t last_check
;
7633 struct md_rdev
*rdev
;
7634 char *desc
, *action
= NULL
;
7635 struct blk_plug plug
;
7637 /* just incase thread restarts... */
7638 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
7640 if (mddev
->ro
) {/* never try to sync a read-only array */
7641 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7645 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7646 if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)) {
7647 desc
= "data-check";
7649 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
7650 desc
= "requested-resync";
7654 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
7659 mddev
->last_sync_action
= action
?: desc
;
7661 /* we overload curr_resync somewhat here.
7662 * 0 == not engaged in resync at all
7663 * 2 == checking that there is no conflict with another sync
7664 * 1 == like 2, but have yielded to allow conflicting resync to
7666 * other == active in resync - this many blocks
7668 * Before starting a resync we must have set curr_resync to
7669 * 2, and then checked that every "conflicting" array has curr_resync
7670 * less than ours. When we find one that is the same or higher
7671 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
7672 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
7673 * This will mean we have to start checking from the beginning again.
7678 mddev
->curr_resync
= 2;
7681 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7683 for_each_mddev(mddev2
, tmp
) {
7684 if (mddev2
== mddev
)
7686 if (!mddev
->parallel_resync
7687 && mddev2
->curr_resync
7688 && match_mddev_units(mddev
, mddev2
)) {
7690 if (mddev
< mddev2
&& mddev
->curr_resync
== 2) {
7691 /* arbitrarily yield */
7692 mddev
->curr_resync
= 1;
7693 wake_up(&resync_wait
);
7695 if (mddev
> mddev2
&& mddev
->curr_resync
== 1)
7696 /* no need to wait here, we can wait the next
7697 * time 'round when curr_resync == 2
7700 /* We need to wait 'interruptible' so as not to
7701 * contribute to the load average, and not to
7702 * be caught by 'softlockup'
7704 prepare_to_wait(&resync_wait
, &wq
, TASK_INTERRUPTIBLE
);
7705 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
7706 mddev2
->curr_resync
>= mddev
->curr_resync
) {
7707 printk(KERN_INFO
"md: delaying %s of %s"
7708 " until %s has finished (they"
7709 " share one or more physical units)\n",
7710 desc
, mdname(mddev
), mdname(mddev2
));
7712 if (signal_pending(current
))
7713 flush_signals(current
);
7715 finish_wait(&resync_wait
, &wq
);
7718 finish_wait(&resync_wait
, &wq
);
7721 } while (mddev
->curr_resync
< 2);
7724 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7725 /* resync follows the size requested by the personality,
7726 * which defaults to physical size, but can be virtual size
7728 max_sectors
= mddev
->resync_max_sectors
;
7729 atomic64_set(&mddev
->resync_mismatches
, 0);
7730 /* we don't use the checkpoint if there's a bitmap */
7731 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7732 j
= mddev
->resync_min
;
7733 else if (!mddev
->bitmap
)
7734 j
= mddev
->recovery_cp
;
7736 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
7737 max_sectors
= mddev
->resync_max_sectors
;
7739 /* recovery follows the physical size of devices */
7740 max_sectors
= mddev
->dev_sectors
;
7743 rdev_for_each_rcu(rdev
, mddev
)
7744 if (rdev
->raid_disk
>= 0 &&
7745 !test_bit(Faulty
, &rdev
->flags
) &&
7746 !test_bit(In_sync
, &rdev
->flags
) &&
7747 rdev
->recovery_offset
< j
)
7748 j
= rdev
->recovery_offset
;
7751 /* If there is a bitmap, we need to make sure all
7752 * writes that started before we added a spare
7753 * complete before we start doing a recovery.
7754 * Otherwise the write might complete and (via
7755 * bitmap_endwrite) set a bit in the bitmap after the
7756 * recovery has checked that bit and skipped that
7759 if (mddev
->bitmap
) {
7760 mddev
->pers
->quiesce(mddev
, 1);
7761 mddev
->pers
->quiesce(mddev
, 0);
7765 printk(KERN_INFO
"md: %s of RAID array %s\n", desc
, mdname(mddev
));
7766 printk(KERN_INFO
"md: minimum _guaranteed_ speed:"
7767 " %d KB/sec/disk.\n", speed_min(mddev
));
7768 printk(KERN_INFO
"md: using maximum available idle IO bandwidth "
7769 "(but not more than %d KB/sec) for %s.\n",
7770 speed_max(mddev
), desc
);
7772 is_mddev_idle(mddev
, 1); /* this initializes IO event counters */
7775 for (m
= 0; m
< SYNC_MARKS
; m
++) {
7777 mark_cnt
[m
] = io_sectors
;
7780 mddev
->resync_mark
= mark
[last_mark
];
7781 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
7784 * Tune reconstruction:
7786 window
= 32*(PAGE_SIZE
/512);
7787 printk(KERN_INFO
"md: using %dk window, over a total of %lluk.\n",
7788 window
/2, (unsigned long long)max_sectors
/2);
7790 atomic_set(&mddev
->recovery_active
, 0);
7795 "md: resuming %s of %s from checkpoint.\n",
7796 desc
, mdname(mddev
));
7797 mddev
->curr_resync
= j
;
7799 mddev
->curr_resync
= 3; /* no longer delayed */
7800 mddev
->curr_resync_completed
= j
;
7801 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
7802 md_new_event(mddev
);
7803 update_time
= jiffies
;
7805 if (mddev_is_clustered(mddev
))
7806 md_cluster_ops
->resync_start(mddev
, j
, max_sectors
);
7808 blk_start_plug(&plug
);
7809 while (j
< max_sectors
) {
7814 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
7815 ((mddev
->curr_resync
> mddev
->curr_resync_completed
&&
7816 (mddev
->curr_resync
- mddev
->curr_resync_completed
)
7817 > (max_sectors
>> 4)) ||
7818 time_after_eq(jiffies
, update_time
+ UPDATE_FREQUENCY
) ||
7819 (j
- mddev
->curr_resync_completed
)*2
7820 >= mddev
->resync_max
- mddev
->curr_resync_completed
||
7821 mddev
->curr_resync_completed
> mddev
->resync_max
7823 /* time to update curr_resync_completed */
7824 wait_event(mddev
->recovery_wait
,
7825 atomic_read(&mddev
->recovery_active
) == 0);
7826 mddev
->curr_resync_completed
= j
;
7827 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) &&
7828 j
> mddev
->recovery_cp
)
7829 mddev
->recovery_cp
= j
;
7830 update_time
= jiffies
;
7831 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7832 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
7835 while (j
>= mddev
->resync_max
&&
7836 !test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
7837 /* As this condition is controlled by user-space,
7838 * we can block indefinitely, so use '_interruptible'
7839 * to avoid triggering warnings.
7841 flush_signals(current
); /* just in case */
7842 wait_event_interruptible(mddev
->recovery_wait
,
7843 mddev
->resync_max
> j
7844 || test_bit(MD_RECOVERY_INTR
,
7848 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7851 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
);
7853 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7857 if (!skipped
) { /* actual IO requested */
7858 io_sectors
+= sectors
;
7859 atomic_add(sectors
, &mddev
->recovery_active
);
7862 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7866 if (j
> max_sectors
)
7867 /* when skipping, extra large numbers can be returned. */
7870 mddev
->curr_resync
= j
;
7871 if (mddev_is_clustered(mddev
))
7872 md_cluster_ops
->resync_info_update(mddev
, j
, max_sectors
);
7873 mddev
->curr_mark_cnt
= io_sectors
;
7874 if (last_check
== 0)
7875 /* this is the earliest that rebuild will be
7876 * visible in /proc/mdstat
7878 md_new_event(mddev
);
7880 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
7883 last_check
= io_sectors
;
7885 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
7887 int next
= (last_mark
+1) % SYNC_MARKS
;
7889 mddev
->resync_mark
= mark
[next
];
7890 mddev
->resync_mark_cnt
= mark_cnt
[next
];
7891 mark
[next
] = jiffies
;
7892 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
7896 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7900 * this loop exits only if either when we are slower than
7901 * the 'hard' speed limit, or the system was IO-idle for
7903 * the system might be non-idle CPU-wise, but we only care
7904 * about not overloading the IO subsystem. (things like an
7905 * e2fsck being done on the RAID array should execute fast)
7909 recovery_done
= io_sectors
- atomic_read(&mddev
->recovery_active
);
7910 currspeed
= ((unsigned long)(recovery_done
- mddev
->resync_mark_cnt
))/2
7911 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
7913 if (currspeed
> speed_min(mddev
)) {
7914 if (currspeed
> speed_max(mddev
)) {
7918 if (!is_mddev_idle(mddev
, 0)) {
7920 * Give other IO more of a chance.
7921 * The faster the devices, the less we wait.
7923 wait_event(mddev
->recovery_wait
,
7924 !atomic_read(&mddev
->recovery_active
));
7928 printk(KERN_INFO
"md: %s: %s %s.\n",mdname(mddev
), desc
,
7929 test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)
7930 ? "interrupted" : "done");
7932 * this also signals 'finished resyncing' to md_stop
7934 blk_finish_plug(&plug
);
7935 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
7937 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
7938 !test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
7939 mddev
->curr_resync
> 2) {
7940 mddev
->curr_resync_completed
= mddev
->curr_resync
;
7941 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
7943 /* tell personality that we are finished */
7944 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
);
7946 if (!test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
) &&
7947 mddev
->curr_resync
> 2) {
7948 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7949 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
7950 if (mddev
->curr_resync
>= mddev
->recovery_cp
) {
7952 "md: checkpointing %s of %s.\n",
7953 desc
, mdname(mddev
));
7954 if (test_bit(MD_RECOVERY_ERROR
,
7956 mddev
->recovery_cp
=
7957 mddev
->curr_resync_completed
;
7959 mddev
->recovery_cp
=
7963 mddev
->recovery_cp
= MaxSector
;
7965 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7966 mddev
->curr_resync
= MaxSector
;
7968 rdev_for_each_rcu(rdev
, mddev
)
7969 if (rdev
->raid_disk
>= 0 &&
7970 mddev
->delta_disks
>= 0 &&
7971 !test_bit(Faulty
, &rdev
->flags
) &&
7972 !test_bit(In_sync
, &rdev
->flags
) &&
7973 rdev
->recovery_offset
< mddev
->curr_resync
)
7974 rdev
->recovery_offset
= mddev
->curr_resync
;
7979 if (mddev_is_clustered(mddev
))
7980 md_cluster_ops
->resync_finish(mddev
);
7982 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7984 spin_lock(&mddev
->lock
);
7985 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
7986 /* We completed so min/max setting can be forgotten if used. */
7987 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7988 mddev
->resync_min
= 0;
7989 mddev
->resync_max
= MaxSector
;
7990 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7991 mddev
->resync_min
= mddev
->curr_resync_completed
;
7992 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
7993 mddev
->curr_resync
= 0;
7994 spin_unlock(&mddev
->lock
);
7996 wake_up(&resync_wait
);
7997 md_wakeup_thread(mddev
->thread
);
8000 EXPORT_SYMBOL_GPL(md_do_sync
);
8002 static int remove_and_add_spares(struct mddev
*mddev
,
8003 struct md_rdev
*this)
8005 struct md_rdev
*rdev
;
8009 rdev_for_each(rdev
, mddev
)
8010 if ((this == NULL
|| rdev
== this) &&
8011 rdev
->raid_disk
>= 0 &&
8012 !test_bit(Blocked
, &rdev
->flags
) &&
8013 (test_bit(Faulty
, &rdev
->flags
) ||
8014 ! test_bit(In_sync
, &rdev
->flags
)) &&
8015 atomic_read(&rdev
->nr_pending
)==0) {
8016 if (mddev
->pers
->hot_remove_disk(
8017 mddev
, rdev
) == 0) {
8018 sysfs_unlink_rdev(mddev
, rdev
);
8019 rdev
->raid_disk
= -1;
8023 if (removed
&& mddev
->kobj
.sd
)
8024 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
8029 rdev_for_each(rdev
, mddev
) {
8030 if (rdev
->raid_disk
>= 0 &&
8031 !test_bit(In_sync
, &rdev
->flags
) &&
8032 !test_bit(Faulty
, &rdev
->flags
))
8034 if (rdev
->raid_disk
>= 0)
8036 if (test_bit(Faulty
, &rdev
->flags
))
8039 ! (rdev
->saved_raid_disk
>= 0 &&
8040 !test_bit(Bitmap_sync
, &rdev
->flags
)))
8043 if (rdev
->saved_raid_disk
< 0)
8044 rdev
->recovery_offset
= 0;
8046 hot_add_disk(mddev
, rdev
) == 0) {
8047 if (sysfs_link_rdev(mddev
, rdev
))
8048 /* failure here is OK */;
8050 md_new_event(mddev
);
8051 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
8056 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
8060 static void md_start_sync(struct work_struct
*ws
)
8062 struct mddev
*mddev
= container_of(ws
, struct mddev
, del_work
);
8064 mddev
->sync_thread
= md_register_thread(md_do_sync
,
8067 if (!mddev
->sync_thread
) {
8068 printk(KERN_ERR
"%s: could not start resync"
8071 /* leave the spares where they are, it shouldn't hurt */
8072 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8073 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
8074 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
8075 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
8076 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8077 wake_up(&resync_wait
);
8078 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
8080 if (mddev
->sysfs_action
)
8081 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
8083 md_wakeup_thread(mddev
->sync_thread
);
8084 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
8085 md_new_event(mddev
);
8089 * This routine is regularly called by all per-raid-array threads to
8090 * deal with generic issues like resync and super-block update.
8091 * Raid personalities that don't have a thread (linear/raid0) do not
8092 * need this as they never do any recovery or update the superblock.
8094 * It does not do any resync itself, but rather "forks" off other threads
8095 * to do that as needed.
8096 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
8097 * "->recovery" and create a thread at ->sync_thread.
8098 * When the thread finishes it sets MD_RECOVERY_DONE
8099 * and wakeups up this thread which will reap the thread and finish up.
8100 * This thread also removes any faulty devices (with nr_pending == 0).
8102 * The overall approach is:
8103 * 1/ if the superblock needs updating, update it.
8104 * 2/ If a recovery thread is running, don't do anything else.
8105 * 3/ If recovery has finished, clean up, possibly marking spares active.
8106 * 4/ If there are any faulty devices, remove them.
8107 * 5/ If array is degraded, try to add spares devices
8108 * 6/ If array has spares or is not in-sync, start a resync thread.
8110 void md_check_recovery(struct mddev
*mddev
)
8112 if (mddev
->suspended
)
8116 bitmap_daemon_work(mddev
);
8118 if (signal_pending(current
)) {
8119 if (mddev
->pers
->sync_request
&& !mddev
->external
) {
8120 printk(KERN_INFO
"md: %s in immediate safe mode\n",
8122 mddev
->safemode
= 2;
8124 flush_signals(current
);
8127 if (mddev
->ro
&& !test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
8130 (mddev
->flags
& MD_UPDATE_SB_FLAGS
& ~ (1<<MD_CHANGE_PENDING
)) ||
8131 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
8132 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
8133 (mddev
->external
== 0 && mddev
->safemode
== 1) ||
8134 (mddev
->safemode
== 2 && ! atomic_read(&mddev
->writes_pending
)
8135 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
8139 if (mddev_trylock(mddev
)) {
8143 struct md_rdev
*rdev
;
8144 if (!mddev
->external
&& mddev
->in_sync
)
8145 /* 'Blocked' flag not needed as failed devices
8146 * will be recorded if array switched to read/write.
8147 * Leaving it set will prevent the device
8148 * from being removed.
8150 rdev_for_each(rdev
, mddev
)
8151 clear_bit(Blocked
, &rdev
->flags
);
8152 /* On a read-only array we can:
8153 * - remove failed devices
8154 * - add already-in_sync devices if the array itself
8156 * As we only add devices that are already in-sync,
8157 * we can activate the spares immediately.
8159 remove_and_add_spares(mddev
, NULL
);
8160 /* There is no thread, but we need to call
8161 * ->spare_active and clear saved_raid_disk
8163 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8164 md_reap_sync_thread(mddev
);
8165 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8166 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
8167 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
8171 if (!mddev
->external
) {
8173 spin_lock(&mddev
->lock
);
8174 if (mddev
->safemode
&&
8175 !atomic_read(&mddev
->writes_pending
) &&
8177 mddev
->recovery_cp
== MaxSector
) {
8180 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
8182 if (mddev
->safemode
== 1)
8183 mddev
->safemode
= 0;
8184 spin_unlock(&mddev
->lock
);
8186 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
8189 if (mddev
->flags
& MD_UPDATE_SB_FLAGS
) {
8190 if (mddev_is_clustered(mddev
))
8191 md_cluster_ops
->metadata_update_start(mddev
);
8192 md_update_sb(mddev
, 0);
8193 if (mddev_is_clustered(mddev
))
8194 md_cluster_ops
->metadata_update_finish(mddev
);
8197 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
8198 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
8199 /* resync/recovery still happening */
8200 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
8203 if (mddev
->sync_thread
) {
8204 md_reap_sync_thread(mddev
);
8207 /* Set RUNNING before clearing NEEDED to avoid
8208 * any transients in the value of "sync_action".
8210 mddev
->curr_resync_completed
= 0;
8211 spin_lock(&mddev
->lock
);
8212 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8213 spin_unlock(&mddev
->lock
);
8214 /* Clear some bits that don't mean anything, but
8217 clear_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8218 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
8220 if (!test_and_clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
8221 test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
8223 /* no recovery is running.
8224 * remove any failed drives, then
8225 * add spares if possible.
8226 * Spares are also removed and re-added, to allow
8227 * the personality to fail the re-add.
8230 if (mddev
->reshape_position
!= MaxSector
) {
8231 if (mddev
->pers
->check_reshape
== NULL
||
8232 mddev
->pers
->check_reshape(mddev
) != 0)
8233 /* Cannot proceed */
8235 set_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
8236 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8237 } else if ((spares
= remove_and_add_spares(mddev
, NULL
))) {
8238 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8239 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
8240 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
8241 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8242 } else if (mddev
->recovery_cp
< MaxSector
) {
8243 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8244 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8245 } else if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
8246 /* nothing to be done ... */
8249 if (mddev
->pers
->sync_request
) {
8251 /* We are adding a device or devices to an array
8252 * which has the bitmap stored on all devices.
8253 * So make sure all bitmap pages get written
8255 bitmap_write_all(mddev
->bitmap
);
8257 INIT_WORK(&mddev
->del_work
, md_start_sync
);
8258 queue_work(md_misc_wq
, &mddev
->del_work
);
8262 if (!mddev
->sync_thread
) {
8263 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8264 wake_up(&resync_wait
);
8265 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
8267 if (mddev
->sysfs_action
)
8268 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
8271 wake_up(&mddev
->sb_wait
);
8272 mddev_unlock(mddev
);
8275 EXPORT_SYMBOL(md_check_recovery
);
8277 void md_reap_sync_thread(struct mddev
*mddev
)
8279 struct md_rdev
*rdev
;
8281 /* resync has finished, collect result */
8282 md_unregister_thread(&mddev
->sync_thread
);
8283 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
8284 !test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
8286 /* activate any spares */
8287 if (mddev
->pers
->spare_active(mddev
)) {
8288 sysfs_notify(&mddev
->kobj
, NULL
,
8290 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
8293 if (mddev_is_clustered(mddev
))
8294 md_cluster_ops
->metadata_update_start(mddev
);
8295 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
8296 mddev
->pers
->finish_reshape
)
8297 mddev
->pers
->finish_reshape(mddev
);
8299 /* If array is no-longer degraded, then any saved_raid_disk
8300 * information must be scrapped.
8302 if (!mddev
->degraded
)
8303 rdev_for_each(rdev
, mddev
)
8304 rdev
->saved_raid_disk
= -1;
8306 md_update_sb(mddev
, 1);
8307 if (mddev_is_clustered(mddev
))
8308 md_cluster_ops
->metadata_update_finish(mddev
);
8309 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8310 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
8311 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8312 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
8313 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
8314 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
8315 wake_up(&resync_wait
);
8316 /* flag recovery needed just to double check */
8317 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
8318 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
8319 md_new_event(mddev
);
8320 if (mddev
->event_work
.func
)
8321 queue_work(md_misc_wq
, &mddev
->event_work
);
8323 EXPORT_SYMBOL(md_reap_sync_thread
);
8325 void md_wait_for_blocked_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
8327 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
8328 wait_event_timeout(rdev
->blocked_wait
,
8329 !test_bit(Blocked
, &rdev
->flags
) &&
8330 !test_bit(BlockedBadBlocks
, &rdev
->flags
),
8331 msecs_to_jiffies(5000));
8332 rdev_dec_pending(rdev
, mddev
);
8334 EXPORT_SYMBOL(md_wait_for_blocked_rdev
);
8336 void md_finish_reshape(struct mddev
*mddev
)
8338 /* called be personality module when reshape completes. */
8339 struct md_rdev
*rdev
;
8341 rdev_for_each(rdev
, mddev
) {
8342 if (rdev
->data_offset
> rdev
->new_data_offset
)
8343 rdev
->sectors
+= rdev
->data_offset
- rdev
->new_data_offset
;
8345 rdev
->sectors
-= rdev
->new_data_offset
- rdev
->data_offset
;
8346 rdev
->data_offset
= rdev
->new_data_offset
;
8349 EXPORT_SYMBOL(md_finish_reshape
);
8351 /* Bad block management.
8352 * We can record which blocks on each device are 'bad' and so just
8353 * fail those blocks, or that stripe, rather than the whole device.
8354 * Entries in the bad-block table are 64bits wide. This comprises:
8355 * Length of bad-range, in sectors: 0-511 for lengths 1-512
8356 * Start of bad-range, sector offset, 54 bits (allows 8 exbibytes)
8357 * A 'shift' can be set so that larger blocks are tracked and
8358 * consequently larger devices can be covered.
8359 * 'Acknowledged' flag - 1 bit. - the most significant bit.
8361 * Locking of the bad-block table uses a seqlock so md_is_badblock
8362 * might need to retry if it is very unlucky.
8363 * We will sometimes want to check for bad blocks in a bi_end_io function,
8364 * so we use the write_seqlock_irq variant.
8366 * When looking for a bad block we specify a range and want to
8367 * know if any block in the range is bad. So we binary-search
8368 * to the last range that starts at-or-before the given endpoint,
8369 * (or "before the sector after the target range")
8370 * then see if it ends after the given start.
8372 * 0 if there are no known bad blocks in the range
8373 * 1 if there are known bad block which are all acknowledged
8374 * -1 if there are bad blocks which have not yet been acknowledged in metadata.
8375 * plus the start/length of the first bad section we overlap.
8377 int md_is_badblock(struct badblocks
*bb
, sector_t s
, int sectors
,
8378 sector_t
*first_bad
, int *bad_sectors
)
8384 sector_t target
= s
+ sectors
;
8387 if (bb
->shift
> 0) {
8388 /* round the start down, and the end up */
8390 target
+= (1<<bb
->shift
) - 1;
8391 target
>>= bb
->shift
;
8392 sectors
= target
- s
;
8394 /* 'target' is now the first block after the bad range */
8397 seq
= read_seqbegin(&bb
->lock
);
8402 /* Binary search between lo and hi for 'target'
8403 * i.e. for the last range that starts before 'target'
8405 /* INVARIANT: ranges before 'lo' and at-or-after 'hi'
8406 * are known not to be the last range before target.
8407 * VARIANT: hi-lo is the number of possible
8408 * ranges, and decreases until it reaches 1
8410 while (hi
- lo
> 1) {
8411 int mid
= (lo
+ hi
) / 2;
8412 sector_t a
= BB_OFFSET(p
[mid
]);
8414 /* This could still be the one, earlier ranges
8418 /* This and later ranges are definitely out. */
8421 /* 'lo' might be the last that started before target, but 'hi' isn't */
8423 /* need to check all range that end after 's' to see if
8424 * any are unacknowledged.
8427 BB_OFFSET(p
[lo
]) + BB_LEN(p
[lo
]) > s
) {
8428 if (BB_OFFSET(p
[lo
]) < target
) {
8429 /* starts before the end, and finishes after
8430 * the start, so they must overlap
8432 if (rv
!= -1 && BB_ACK(p
[lo
]))
8436 *first_bad
= BB_OFFSET(p
[lo
]);
8437 *bad_sectors
= BB_LEN(p
[lo
]);
8443 if (read_seqretry(&bb
->lock
, seq
))
8448 EXPORT_SYMBOL_GPL(md_is_badblock
);
8451 * Add a range of bad blocks to the table.
8452 * This might extend the table, or might contract it
8453 * if two adjacent ranges can be merged.
8454 * We binary-search to find the 'insertion' point, then
8455 * decide how best to handle it.
8457 static int md_set_badblocks(struct badblocks
*bb
, sector_t s
, int sectors
,
8463 unsigned long flags
;
8466 /* badblocks are disabled */
8470 /* round the start down, and the end up */
8471 sector_t next
= s
+ sectors
;
8473 next
+= (1<<bb
->shift
) - 1;
8478 write_seqlock_irqsave(&bb
->lock
, flags
);
8483 /* Find the last range that starts at-or-before 's' */
8484 while (hi
- lo
> 1) {
8485 int mid
= (lo
+ hi
) / 2;
8486 sector_t a
= BB_OFFSET(p
[mid
]);
8492 if (hi
> lo
&& BB_OFFSET(p
[lo
]) > s
)
8496 /* we found a range that might merge with the start
8499 sector_t a
= BB_OFFSET(p
[lo
]);
8500 sector_t e
= a
+ BB_LEN(p
[lo
]);
8501 int ack
= BB_ACK(p
[lo
]);
8503 /* Yes, we can merge with a previous range */
8504 if (s
== a
&& s
+ sectors
>= e
)
8505 /* new range covers old */
8508 ack
= ack
&& acknowledged
;
8510 if (e
< s
+ sectors
)
8512 if (e
- a
<= BB_MAX_LEN
) {
8513 p
[lo
] = BB_MAKE(a
, e
-a
, ack
);
8516 /* does not all fit in one range,
8517 * make p[lo] maximal
8519 if (BB_LEN(p
[lo
]) != BB_MAX_LEN
)
8520 p
[lo
] = BB_MAKE(a
, BB_MAX_LEN
, ack
);
8526 if (sectors
&& hi
< bb
->count
) {
8527 /* 'hi' points to the first range that starts after 's'.
8528 * Maybe we can merge with the start of that range */
8529 sector_t a
= BB_OFFSET(p
[hi
]);
8530 sector_t e
= a
+ BB_LEN(p
[hi
]);
8531 int ack
= BB_ACK(p
[hi
]);
8532 if (a
<= s
+ sectors
) {
8533 /* merging is possible */
8534 if (e
<= s
+ sectors
) {
8539 ack
= ack
&& acknowledged
;
8542 if (e
- a
<= BB_MAX_LEN
) {
8543 p
[hi
] = BB_MAKE(a
, e
-a
, ack
);
8546 p
[hi
] = BB_MAKE(a
, BB_MAX_LEN
, ack
);
8554 if (sectors
== 0 && hi
< bb
->count
) {
8555 /* we might be able to combine lo and hi */
8556 /* Note: 's' is at the end of 'lo' */
8557 sector_t a
= BB_OFFSET(p
[hi
]);
8558 int lolen
= BB_LEN(p
[lo
]);
8559 int hilen
= BB_LEN(p
[hi
]);
8560 int newlen
= lolen
+ hilen
- (s
- a
);
8561 if (s
>= a
&& newlen
< BB_MAX_LEN
) {
8562 /* yes, we can combine them */
8563 int ack
= BB_ACK(p
[lo
]) && BB_ACK(p
[hi
]);
8564 p
[lo
] = BB_MAKE(BB_OFFSET(p
[lo
]), newlen
, ack
);
8565 memmove(p
+ hi
, p
+ hi
+ 1,
8566 (bb
->count
- hi
- 1) * 8);
8571 /* didn't merge (it all).
8572 * Need to add a range just before 'hi' */
8573 if (bb
->count
>= MD_MAX_BADBLOCKS
) {
8574 /* No room for more */
8578 int this_sectors
= sectors
;
8579 memmove(p
+ hi
+ 1, p
+ hi
,
8580 (bb
->count
- hi
) * 8);
8583 if (this_sectors
> BB_MAX_LEN
)
8584 this_sectors
= BB_MAX_LEN
;
8585 p
[hi
] = BB_MAKE(s
, this_sectors
, acknowledged
);
8586 sectors
-= this_sectors
;
8593 bb
->unacked_exist
= 1;
8594 write_sequnlock_irqrestore(&bb
->lock
, flags
);
8599 int rdev_set_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
8604 s
+= rdev
->new_data_offset
;
8606 s
+= rdev
->data_offset
;
8607 rv
= md_set_badblocks(&rdev
->badblocks
,
8610 /* Make sure they get written out promptly */
8611 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
8612 set_bit(MD_CHANGE_CLEAN
, &rdev
->mddev
->flags
);
8613 set_bit(MD_CHANGE_PENDING
, &rdev
->mddev
->flags
);
8614 md_wakeup_thread(rdev
->mddev
->thread
);
8618 EXPORT_SYMBOL_GPL(rdev_set_badblocks
);
8621 * Remove a range of bad blocks from the table.
8622 * This may involve extending the table if we spilt a region,
8623 * but it must not fail. So if the table becomes full, we just
8624 * drop the remove request.
8626 static int md_clear_badblocks(struct badblocks
*bb
, sector_t s
, int sectors
)
8630 sector_t target
= s
+ sectors
;
8633 if (bb
->shift
> 0) {
8634 /* When clearing we round the start up and the end down.
8635 * This should not matter as the shift should align with
8636 * the block size and no rounding should ever be needed.
8637 * However it is better the think a block is bad when it
8638 * isn't than to think a block is not bad when it is.
8640 s
+= (1<<bb
->shift
) - 1;
8642 target
>>= bb
->shift
;
8643 sectors
= target
- s
;
8646 write_seqlock_irq(&bb
->lock
);
8651 /* Find the last range that starts before 'target' */
8652 while (hi
- lo
> 1) {
8653 int mid
= (lo
+ hi
) / 2;
8654 sector_t a
= BB_OFFSET(p
[mid
]);
8661 /* p[lo] is the last range that could overlap the
8662 * current range. Earlier ranges could also overlap,
8663 * but only this one can overlap the end of the range.
8665 if (BB_OFFSET(p
[lo
]) + BB_LEN(p
[lo
]) > target
) {
8666 /* Partial overlap, leave the tail of this range */
8667 int ack
= BB_ACK(p
[lo
]);
8668 sector_t a
= BB_OFFSET(p
[lo
]);
8669 sector_t end
= a
+ BB_LEN(p
[lo
]);
8672 /* we need to split this range */
8673 if (bb
->count
>= MD_MAX_BADBLOCKS
) {
8677 memmove(p
+lo
+1, p
+lo
, (bb
->count
- lo
) * 8);
8679 p
[lo
] = BB_MAKE(a
, s
-a
, ack
);
8682 p
[lo
] = BB_MAKE(target
, end
- target
, ack
);
8683 /* there is no longer an overlap */
8688 BB_OFFSET(p
[lo
]) + BB_LEN(p
[lo
]) > s
) {
8689 /* This range does overlap */
8690 if (BB_OFFSET(p
[lo
]) < s
) {
8691 /* Keep the early parts of this range. */
8692 int ack
= BB_ACK(p
[lo
]);
8693 sector_t start
= BB_OFFSET(p
[lo
]);
8694 p
[lo
] = BB_MAKE(start
, s
- start
, ack
);
8695 /* now low doesn't overlap, so.. */
8700 /* 'lo' is strictly before, 'hi' is strictly after,
8701 * anything between needs to be discarded
8704 memmove(p
+lo
+1, p
+hi
, (bb
->count
- hi
) * 8);
8705 bb
->count
-= (hi
- lo
- 1);
8711 write_sequnlock_irq(&bb
->lock
);
8715 int rdev_clear_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
8719 s
+= rdev
->new_data_offset
;
8721 s
+= rdev
->data_offset
;
8722 return md_clear_badblocks(&rdev
->badblocks
,
8725 EXPORT_SYMBOL_GPL(rdev_clear_badblocks
);
8728 * Acknowledge all bad blocks in a list.
8729 * This only succeeds if ->changed is clear. It is used by
8730 * in-kernel metadata updates
8732 void md_ack_all_badblocks(struct badblocks
*bb
)
8734 if (bb
->page
== NULL
|| bb
->changed
)
8735 /* no point even trying */
8737 write_seqlock_irq(&bb
->lock
);
8739 if (bb
->changed
== 0 && bb
->unacked_exist
) {
8742 for (i
= 0; i
< bb
->count
; i
++) {
8743 if (!BB_ACK(p
[i
])) {
8744 sector_t start
= BB_OFFSET(p
[i
]);
8745 int len
= BB_LEN(p
[i
]);
8746 p
[i
] = BB_MAKE(start
, len
, 1);
8749 bb
->unacked_exist
= 0;
8751 write_sequnlock_irq(&bb
->lock
);
8753 EXPORT_SYMBOL_GPL(md_ack_all_badblocks
);
8755 /* sysfs access to bad-blocks list.
8756 * We present two files.
8757 * 'bad-blocks' lists sector numbers and lengths of ranges that
8758 * are recorded as bad. The list is truncated to fit within
8759 * the one-page limit of sysfs.
8760 * Writing "sector length" to this file adds an acknowledged
8762 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
8763 * been acknowledged. Writing to this file adds bad blocks
8764 * without acknowledging them. This is largely for testing.
8768 badblocks_show(struct badblocks
*bb
, char *page
, int unack
)
8779 seq
= read_seqbegin(&bb
->lock
);
8784 while (len
< PAGE_SIZE
&& i
< bb
->count
) {
8785 sector_t s
= BB_OFFSET(p
[i
]);
8786 unsigned int length
= BB_LEN(p
[i
]);
8787 int ack
= BB_ACK(p
[i
]);
8793 len
+= snprintf(page
+len
, PAGE_SIZE
-len
, "%llu %u\n",
8794 (unsigned long long)s
<< bb
->shift
,
8795 length
<< bb
->shift
);
8797 if (unack
&& len
== 0)
8798 bb
->unacked_exist
= 0;
8800 if (read_seqretry(&bb
->lock
, seq
))
8809 badblocks_store(struct badblocks
*bb
, const char *page
, size_t len
, int unack
)
8811 unsigned long long sector
;
8815 /* Allow clearing via sysfs *only* for testing/debugging.
8816 * Normally only a successful write may clear a badblock
8819 if (page
[0] == '-') {
8823 #endif /* DO_DEBUG */
8825 switch (sscanf(page
, "%llu %d%c", §or
, &length
, &newline
)) {
8827 if (newline
!= '\n')
8839 md_clear_badblocks(bb
, sector
, length
);
8842 #endif /* DO_DEBUG */
8843 if (md_set_badblocks(bb
, sector
, length
, !unack
))
8849 static int md_notify_reboot(struct notifier_block
*this,
8850 unsigned long code
, void *x
)
8852 struct list_head
*tmp
;
8853 struct mddev
*mddev
;
8856 for_each_mddev(mddev
, tmp
) {
8857 if (mddev_trylock(mddev
)) {
8859 __md_stop_writes(mddev
);
8860 if (mddev
->persistent
)
8861 mddev
->safemode
= 2;
8862 mddev_unlock(mddev
);
8867 * certain more exotic SCSI devices are known to be
8868 * volatile wrt too early system reboots. While the
8869 * right place to handle this issue is the given
8870 * driver, we do want to have a safe RAID driver ...
8878 static struct notifier_block md_notifier
= {
8879 .notifier_call
= md_notify_reboot
,
8881 .priority
= INT_MAX
, /* before any real devices */
8884 static void md_geninit(void)
8886 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
8888 proc_create("mdstat", S_IRUGO
, NULL
, &md_seq_fops
);
8891 static int __init
md_init(void)
8895 md_wq
= alloc_workqueue("md", WQ_MEM_RECLAIM
, 0);
8899 md_misc_wq
= alloc_workqueue("md_misc", 0, 0);
8903 if ((ret
= register_blkdev(MD_MAJOR
, "md")) < 0)
8906 if ((ret
= register_blkdev(0, "mdp")) < 0)
8910 blk_register_region(MKDEV(MD_MAJOR
, 0), 512, THIS_MODULE
,
8911 md_probe
, NULL
, NULL
);
8912 blk_register_region(MKDEV(mdp_major
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
8913 md_probe
, NULL
, NULL
);
8915 register_reboot_notifier(&md_notifier
);
8916 raid_table_header
= register_sysctl_table(raid_root_table
);
8922 unregister_blkdev(MD_MAJOR
, "md");
8924 destroy_workqueue(md_misc_wq
);
8926 destroy_workqueue(md_wq
);
8931 void md_reload_sb(struct mddev
*mddev
)
8933 struct md_rdev
*rdev
, *tmp
;
8935 rdev_for_each_safe(rdev
, tmp
, mddev
) {
8936 rdev
->sb_loaded
= 0;
8937 ClearPageUptodate(rdev
->sb_page
);
8939 mddev
->raid_disks
= 0;
8941 rdev_for_each_safe(rdev
, tmp
, mddev
) {
8942 struct mdp_superblock_1
*sb
= page_address(rdev
->sb_page
);
8943 /* since we don't write to faulty devices, we figure out if the
8944 * disk is faulty by comparing events
8946 if (mddev
->events
> sb
->events
)
8947 set_bit(Faulty
, &rdev
->flags
);
8951 EXPORT_SYMBOL(md_reload_sb
);
8956 * Searches all registered partitions for autorun RAID arrays
8960 static LIST_HEAD(all_detected_devices
);
8961 struct detected_devices_node
{
8962 struct list_head list
;
8966 void md_autodetect_dev(dev_t dev
)
8968 struct detected_devices_node
*node_detected_dev
;
8970 node_detected_dev
= kzalloc(sizeof(*node_detected_dev
), GFP_KERNEL
);
8971 if (node_detected_dev
) {
8972 node_detected_dev
->dev
= dev
;
8973 list_add_tail(&node_detected_dev
->list
, &all_detected_devices
);
8975 printk(KERN_CRIT
"md: md_autodetect_dev: kzalloc failed"
8976 ", skipping dev(%d,%d)\n", MAJOR(dev
), MINOR(dev
));
8980 static void autostart_arrays(int part
)
8982 struct md_rdev
*rdev
;
8983 struct detected_devices_node
*node_detected_dev
;
8985 int i_scanned
, i_passed
;
8990 printk(KERN_INFO
"md: Autodetecting RAID arrays.\n");
8992 while (!list_empty(&all_detected_devices
) && i_scanned
< INT_MAX
) {
8994 node_detected_dev
= list_entry(all_detected_devices
.next
,
8995 struct detected_devices_node
, list
);
8996 list_del(&node_detected_dev
->list
);
8997 dev
= node_detected_dev
->dev
;
8998 kfree(node_detected_dev
);
8999 rdev
= md_import_device(dev
,0, 90);
9003 if (test_bit(Faulty
, &rdev
->flags
))
9006 set_bit(AutoDetected
, &rdev
->flags
);
9007 list_add(&rdev
->same_set
, &pending_raid_disks
);
9011 printk(KERN_INFO
"md: Scanned %d and added %d devices.\n",
9012 i_scanned
, i_passed
);
9014 autorun_devices(part
);
9017 #endif /* !MODULE */
9019 static __exit
void md_exit(void)
9021 struct mddev
*mddev
;
9022 struct list_head
*tmp
;
9025 blk_unregister_region(MKDEV(MD_MAJOR
,0), 512);
9026 blk_unregister_region(MKDEV(mdp_major
,0), 1U << MINORBITS
);
9028 unregister_blkdev(MD_MAJOR
,"md");
9029 unregister_blkdev(mdp_major
, "mdp");
9030 unregister_reboot_notifier(&md_notifier
);
9031 unregister_sysctl_table(raid_table_header
);
9033 /* We cannot unload the modules while some process is
9034 * waiting for us in select() or poll() - wake them up
9037 while (waitqueue_active(&md_event_waiters
)) {
9038 /* not safe to leave yet */
9039 wake_up(&md_event_waiters
);
9043 remove_proc_entry("mdstat", NULL
);
9045 for_each_mddev(mddev
, tmp
) {
9046 export_array(mddev
);
9047 mddev
->hold_active
= 0;
9049 destroy_workqueue(md_misc_wq
);
9050 destroy_workqueue(md_wq
);
9053 subsys_initcall(md_init
);
9054 module_exit(md_exit
)
9056 static int get_ro(char *buffer
, struct kernel_param
*kp
)
9058 return sprintf(buffer
, "%d", start_readonly
);
9060 static int set_ro(const char *val
, struct kernel_param
*kp
)
9062 return kstrtouint(val
, 10, (unsigned int *)&start_readonly
);
9065 module_param_call(start_ro
, set_ro
, get_ro
, NULL
, S_IRUSR
|S_IWUSR
);
9066 module_param(start_dirty_degraded
, int, S_IRUGO
|S_IWUSR
);
9067 module_param_call(new_array
, add_named_array
, NULL
, NULL
, S_IWUSR
);
9069 MODULE_LICENSE("GPL");
9070 MODULE_DESCRIPTION("MD RAID framework");
9072 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);