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.
34 Errors, Warnings, etc.
36 pr_crit() for error conditions that risk data loss
37 pr_err() for error conditions that are unexpected, like an IO error
38 or internal inconsistency
39 pr_warn() for error conditions that could have been predicated, like
40 adding a device to an array when it has incompatible metadata
41 pr_info() for every interesting, very rare events, like an array starting
42 or stopping, or resync starting or stopping
43 pr_debug() for everything else.
47 #include <linux/sched/signal.h>
48 #include <linux/kthread.h>
49 #include <linux/blkdev.h>
50 #include <linux/badblocks.h>
51 #include <linux/sysctl.h>
52 #include <linux/seq_file.h>
54 #include <linux/poll.h>
55 #include <linux/ctype.h>
56 #include <linux/string.h>
57 #include <linux/hdreg.h>
58 #include <linux/proc_fs.h>
59 #include <linux/random.h>
60 #include <linux/module.h>
61 #include <linux/reboot.h>
62 #include <linux/file.h>
63 #include <linux/compat.h>
64 #include <linux/delay.h>
65 #include <linux/raid/md_p.h>
66 #include <linux/raid/md_u.h>
67 #include <linux/slab.h>
68 #include <trace/events/block.h>
71 #include "md-cluster.h"
74 static void autostart_arrays(int part
);
77 /* pers_list is a list of registered personalities protected
79 * pers_lock does extra service to protect accesses to
80 * mddev->thread when the mutex cannot be held.
82 static LIST_HEAD(pers_list
);
83 static DEFINE_SPINLOCK(pers_lock
);
85 struct md_cluster_operations
*md_cluster_ops
;
86 EXPORT_SYMBOL(md_cluster_ops
);
87 struct module
*md_cluster_mod
;
88 EXPORT_SYMBOL(md_cluster_mod
);
90 static DECLARE_WAIT_QUEUE_HEAD(resync_wait
);
91 static struct workqueue_struct
*md_wq
;
92 static struct workqueue_struct
*md_misc_wq
;
94 static int remove_and_add_spares(struct mddev
*mddev
,
95 struct md_rdev
*this);
96 static void mddev_detach(struct mddev
*mddev
);
99 * Default number of read corrections we'll attempt on an rdev
100 * before ejecting it from the array. We divide the read error
101 * count by 2 for every hour elapsed between read errors.
103 #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
105 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
106 * is 1000 KB/sec, so the extra system load does not show up that much.
107 * Increase it if you want to have more _guaranteed_ speed. Note that
108 * the RAID driver will use the maximum available bandwidth if the IO
109 * subsystem is idle. There is also an 'absolute maximum' reconstruction
110 * speed limit - in case reconstruction slows down your system despite
113 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
114 * or /sys/block/mdX/md/sync_speed_{min,max}
117 static int sysctl_speed_limit_min
= 1000;
118 static int sysctl_speed_limit_max
= 200000;
119 static inline int speed_min(struct mddev
*mddev
)
121 return mddev
->sync_speed_min
?
122 mddev
->sync_speed_min
: sysctl_speed_limit_min
;
125 static inline int speed_max(struct mddev
*mddev
)
127 return mddev
->sync_speed_max
?
128 mddev
->sync_speed_max
: sysctl_speed_limit_max
;
131 static struct ctl_table_header
*raid_table_header
;
133 static struct ctl_table raid_table
[] = {
135 .procname
= "speed_limit_min",
136 .data
= &sysctl_speed_limit_min
,
137 .maxlen
= sizeof(int),
138 .mode
= S_IRUGO
|S_IWUSR
,
139 .proc_handler
= proc_dointvec
,
142 .procname
= "speed_limit_max",
143 .data
= &sysctl_speed_limit_max
,
144 .maxlen
= sizeof(int),
145 .mode
= S_IRUGO
|S_IWUSR
,
146 .proc_handler
= proc_dointvec
,
151 static struct ctl_table raid_dir_table
[] = {
155 .mode
= S_IRUGO
|S_IXUGO
,
161 static struct ctl_table raid_root_table
[] = {
166 .child
= raid_dir_table
,
171 static const struct block_device_operations md_fops
;
173 static int start_readonly
;
176 * like bio_clone, but with a local bio set
179 struct bio
*bio_alloc_mddev(gfp_t gfp_mask
, int nr_iovecs
,
184 if (!mddev
|| !mddev
->bio_set
)
185 return bio_alloc(gfp_mask
, nr_iovecs
);
187 b
= bio_alloc_bioset(gfp_mask
, nr_iovecs
, mddev
->bio_set
);
192 EXPORT_SYMBOL_GPL(bio_alloc_mddev
);
195 * We have a system wide 'event count' that is incremented
196 * on any 'interesting' event, and readers of /proc/mdstat
197 * can use 'poll' or 'select' to find out when the event
201 * start array, stop array, error, add device, remove device,
202 * start build, activate spare
204 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters
);
205 static atomic_t md_event_count
;
206 void md_new_event(struct mddev
*mddev
)
208 atomic_inc(&md_event_count
);
209 wake_up(&md_event_waiters
);
211 EXPORT_SYMBOL_GPL(md_new_event
);
214 * Enables to iterate over all existing md arrays
215 * all_mddevs_lock protects this list.
217 static LIST_HEAD(all_mddevs
);
218 static DEFINE_SPINLOCK(all_mddevs_lock
);
221 * iterates through all used mddevs in the system.
222 * We take care to grab the all_mddevs_lock whenever navigating
223 * the list, and to always hold a refcount when unlocked.
224 * Any code which breaks out of this loop while own
225 * a reference to the current mddev and must mddev_put it.
227 #define for_each_mddev(_mddev,_tmp) \
229 for (({ spin_lock(&all_mddevs_lock); \
230 _tmp = all_mddevs.next; \
232 ({ if (_tmp != &all_mddevs) \
233 mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\
234 spin_unlock(&all_mddevs_lock); \
235 if (_mddev) mddev_put(_mddev); \
236 _mddev = list_entry(_tmp, struct mddev, all_mddevs); \
237 _tmp != &all_mddevs;}); \
238 ({ spin_lock(&all_mddevs_lock); \
239 _tmp = _tmp->next;}) \
242 /* Rather than calling directly into the personality make_request function,
243 * IO requests come here first so that we can check if the device is
244 * being suspended pending a reconfiguration.
245 * We hold a refcount over the call to ->make_request. By the time that
246 * call has finished, the bio has been linked into some internal structure
247 * and so is visible to ->quiesce(), so we don't need the refcount any more.
249 static blk_qc_t
md_make_request(struct request_queue
*q
, struct bio
*bio
)
251 const int rw
= bio_data_dir(bio
);
252 struct mddev
*mddev
= q
->queuedata
;
253 unsigned int sectors
;
256 blk_queue_split(q
, &bio
, q
->bio_split
);
258 if (mddev
== NULL
|| mddev
->pers
== NULL
) {
260 return BLK_QC_T_NONE
;
262 if (mddev
->ro
== 1 && unlikely(rw
== WRITE
)) {
263 if (bio_sectors(bio
) != 0)
264 bio
->bi_error
= -EROFS
;
266 return BLK_QC_T_NONE
;
268 smp_rmb(); /* Ensure implications of 'active' are visible */
270 if (mddev
->suspended
) {
273 prepare_to_wait(&mddev
->sb_wait
, &__wait
,
274 TASK_UNINTERRUPTIBLE
);
275 if (!mddev
->suspended
)
281 finish_wait(&mddev
->sb_wait
, &__wait
);
283 atomic_inc(&mddev
->active_io
);
287 * save the sectors now since our bio can
288 * go away inside make_request
290 sectors
= bio_sectors(bio
);
291 /* bio could be mergeable after passing to underlayer */
292 bio
->bi_opf
&= ~REQ_NOMERGE
;
293 mddev
->pers
->make_request(mddev
, bio
);
295 cpu
= part_stat_lock();
296 part_stat_inc(cpu
, &mddev
->gendisk
->part0
, ios
[rw
]);
297 part_stat_add(cpu
, &mddev
->gendisk
->part0
, sectors
[rw
], sectors
);
300 if (atomic_dec_and_test(&mddev
->active_io
) && mddev
->suspended
)
301 wake_up(&mddev
->sb_wait
);
303 return BLK_QC_T_NONE
;
306 /* mddev_suspend makes sure no new requests are submitted
307 * to the device, and that any requests that have been submitted
308 * are completely handled.
309 * Once mddev_detach() is called and completes, the module will be
312 void mddev_suspend(struct mddev
*mddev
)
314 WARN_ON_ONCE(mddev
->thread
&& current
== mddev
->thread
->tsk
);
315 if (mddev
->suspended
++)
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 if (--mddev
->suspended
)
329 wake_up(&mddev
->sb_wait
);
330 mddev
->pers
->quiesce(mddev
, 0);
332 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
333 md_wakeup_thread(mddev
->thread
);
334 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
336 EXPORT_SYMBOL_GPL(mddev_resume
);
338 int mddev_congested(struct mddev
*mddev
, int bits
)
340 struct md_personality
*pers
= mddev
->pers
;
344 if (mddev
->suspended
)
346 else if (pers
&& pers
->congested
)
347 ret
= pers
->congested(mddev
, bits
);
351 EXPORT_SYMBOL_GPL(mddev_congested
);
352 static int md_congested(void *data
, int bits
)
354 struct mddev
*mddev
= data
;
355 return mddev_congested(mddev
, bits
);
359 * Generic flush handling for md
362 static void md_end_flush(struct bio
*bio
)
364 struct md_rdev
*rdev
= bio
->bi_private
;
365 struct mddev
*mddev
= rdev
->mddev
;
367 rdev_dec_pending(rdev
, mddev
);
369 if (atomic_dec_and_test(&mddev
->flush_pending
)) {
370 /* The pre-request flush has finished */
371 queue_work(md_wq
, &mddev
->flush_work
);
376 static void md_submit_flush_data(struct work_struct
*ws
);
378 static void submit_flushes(struct work_struct
*ws
)
380 struct mddev
*mddev
= container_of(ws
, struct mddev
, flush_work
);
381 struct md_rdev
*rdev
;
383 INIT_WORK(&mddev
->flush_work
, md_submit_flush_data
);
384 atomic_set(&mddev
->flush_pending
, 1);
386 rdev_for_each_rcu(rdev
, mddev
)
387 if (rdev
->raid_disk
>= 0 &&
388 !test_bit(Faulty
, &rdev
->flags
)) {
389 /* Take two references, one is dropped
390 * when request finishes, one after
391 * we reclaim rcu_read_lock
394 atomic_inc(&rdev
->nr_pending
);
395 atomic_inc(&rdev
->nr_pending
);
397 bi
= bio_alloc_mddev(GFP_NOIO
, 0, mddev
);
398 bi
->bi_end_io
= md_end_flush
;
399 bi
->bi_private
= rdev
;
400 bi
->bi_bdev
= rdev
->bdev
;
401 bi
->bi_opf
= REQ_OP_WRITE
| REQ_PREFLUSH
;
402 atomic_inc(&mddev
->flush_pending
);
405 rdev_dec_pending(rdev
, mddev
);
408 if (atomic_dec_and_test(&mddev
->flush_pending
))
409 queue_work(md_wq
, &mddev
->flush_work
);
412 static void md_submit_flush_data(struct work_struct
*ws
)
414 struct mddev
*mddev
= container_of(ws
, struct mddev
, flush_work
);
415 struct bio
*bio
= mddev
->flush_bio
;
417 if (bio
->bi_iter
.bi_size
== 0)
418 /* an empty barrier - all done */
421 bio
->bi_opf
&= ~REQ_PREFLUSH
;
422 mddev
->pers
->make_request(mddev
, bio
);
425 mddev
->flush_bio
= NULL
;
426 wake_up(&mddev
->sb_wait
);
429 void md_flush_request(struct mddev
*mddev
, struct bio
*bio
)
431 spin_lock_irq(&mddev
->lock
);
432 wait_event_lock_irq(mddev
->sb_wait
,
435 mddev
->flush_bio
= bio
;
436 spin_unlock_irq(&mddev
->lock
);
438 INIT_WORK(&mddev
->flush_work
, submit_flushes
);
439 queue_work(md_wq
, &mddev
->flush_work
);
441 EXPORT_SYMBOL(md_flush_request
);
443 static inline struct mddev
*mddev_get(struct mddev
*mddev
)
445 atomic_inc(&mddev
->active
);
449 static void mddev_delayed_delete(struct work_struct
*ws
);
451 static void mddev_put(struct mddev
*mddev
)
453 struct bio_set
*bs
= NULL
;
455 if (!atomic_dec_and_lock(&mddev
->active
, &all_mddevs_lock
))
457 if (!mddev
->raid_disks
&& list_empty(&mddev
->disks
) &&
458 mddev
->ctime
== 0 && !mddev
->hold_active
) {
459 /* Array is not configured at all, and not held active,
461 list_del_init(&mddev
->all_mddevs
);
463 mddev
->bio_set
= NULL
;
464 if (mddev
->gendisk
) {
465 /* We did a probe so need to clean up. Call
466 * queue_work inside the spinlock so that
467 * flush_workqueue() after mddev_find will
468 * succeed in waiting for the work to be done.
470 INIT_WORK(&mddev
->del_work
, mddev_delayed_delete
);
471 queue_work(md_misc_wq
, &mddev
->del_work
);
475 spin_unlock(&all_mddevs_lock
);
480 static void md_safemode_timeout(unsigned long data
);
482 void mddev_init(struct mddev
*mddev
)
484 mutex_init(&mddev
->open_mutex
);
485 mutex_init(&mddev
->reconfig_mutex
);
486 mutex_init(&mddev
->bitmap_info
.mutex
);
487 INIT_LIST_HEAD(&mddev
->disks
);
488 INIT_LIST_HEAD(&mddev
->all_mddevs
);
489 setup_timer(&mddev
->safemode_timer
, md_safemode_timeout
,
490 (unsigned long) mddev
);
491 atomic_set(&mddev
->active
, 1);
492 atomic_set(&mddev
->openers
, 0);
493 atomic_set(&mddev
->active_io
, 0);
494 spin_lock_init(&mddev
->lock
);
495 atomic_set(&mddev
->flush_pending
, 0);
496 init_waitqueue_head(&mddev
->sb_wait
);
497 init_waitqueue_head(&mddev
->recovery_wait
);
498 mddev
->reshape_position
= MaxSector
;
499 mddev
->reshape_backwards
= 0;
500 mddev
->last_sync_action
= "none";
501 mddev
->resync_min
= 0;
502 mddev
->resync_max
= MaxSector
;
503 mddev
->level
= LEVEL_NONE
;
505 EXPORT_SYMBOL_GPL(mddev_init
);
507 static struct mddev
*mddev_find(dev_t unit
)
509 struct mddev
*mddev
, *new = NULL
;
511 if (unit
&& MAJOR(unit
) != MD_MAJOR
)
512 unit
&= ~((1<<MdpMinorShift
)-1);
515 spin_lock(&all_mddevs_lock
);
518 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
519 if (mddev
->unit
== unit
) {
521 spin_unlock(&all_mddevs_lock
);
527 list_add(&new->all_mddevs
, &all_mddevs
);
528 spin_unlock(&all_mddevs_lock
);
529 new->hold_active
= UNTIL_IOCTL
;
533 /* find an unused unit number */
534 static int next_minor
= 512;
535 int start
= next_minor
;
539 dev
= MKDEV(MD_MAJOR
, next_minor
);
541 if (next_minor
> MINORMASK
)
543 if (next_minor
== start
) {
544 /* Oh dear, all in use. */
545 spin_unlock(&all_mddevs_lock
);
551 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
552 if (mddev
->unit
== dev
) {
558 new->md_minor
= MINOR(dev
);
559 new->hold_active
= UNTIL_STOP
;
560 list_add(&new->all_mddevs
, &all_mddevs
);
561 spin_unlock(&all_mddevs_lock
);
564 spin_unlock(&all_mddevs_lock
);
566 new = kzalloc(sizeof(*new), GFP_KERNEL
);
571 if (MAJOR(unit
) == MD_MAJOR
)
572 new->md_minor
= MINOR(unit
);
574 new->md_minor
= MINOR(unit
) >> MdpMinorShift
;
581 static struct attribute_group md_redundancy_group
;
583 void mddev_unlock(struct mddev
*mddev
)
585 if (mddev
->to_remove
) {
586 /* These cannot be removed under reconfig_mutex as
587 * an access to the files will try to take reconfig_mutex
588 * while holding the file unremovable, which leads to
590 * So hold set sysfs_active while the remove in happeing,
591 * and anything else which might set ->to_remove or my
592 * otherwise change the sysfs namespace will fail with
593 * -EBUSY if sysfs_active is still set.
594 * We set sysfs_active under reconfig_mutex and elsewhere
595 * test it under the same mutex to ensure its correct value
598 struct attribute_group
*to_remove
= mddev
->to_remove
;
599 mddev
->to_remove
= NULL
;
600 mddev
->sysfs_active
= 1;
601 mutex_unlock(&mddev
->reconfig_mutex
);
603 if (mddev
->kobj
.sd
) {
604 if (to_remove
!= &md_redundancy_group
)
605 sysfs_remove_group(&mddev
->kobj
, to_remove
);
606 if (mddev
->pers
== NULL
||
607 mddev
->pers
->sync_request
== NULL
) {
608 sysfs_remove_group(&mddev
->kobj
, &md_redundancy_group
);
609 if (mddev
->sysfs_action
)
610 sysfs_put(mddev
->sysfs_action
);
611 mddev
->sysfs_action
= NULL
;
614 mddev
->sysfs_active
= 0;
616 mutex_unlock(&mddev
->reconfig_mutex
);
618 /* As we've dropped the mutex we need a spinlock to
619 * make sure the thread doesn't disappear
621 spin_lock(&pers_lock
);
622 md_wakeup_thread(mddev
->thread
);
623 spin_unlock(&pers_lock
);
625 EXPORT_SYMBOL_GPL(mddev_unlock
);
627 struct md_rdev
*md_find_rdev_nr_rcu(struct mddev
*mddev
, int nr
)
629 struct md_rdev
*rdev
;
631 rdev_for_each_rcu(rdev
, mddev
)
632 if (rdev
->desc_nr
== nr
)
637 EXPORT_SYMBOL_GPL(md_find_rdev_nr_rcu
);
639 static struct md_rdev
*find_rdev(struct mddev
*mddev
, dev_t dev
)
641 struct md_rdev
*rdev
;
643 rdev_for_each(rdev
, mddev
)
644 if (rdev
->bdev
->bd_dev
== dev
)
650 static struct md_rdev
*find_rdev_rcu(struct mddev
*mddev
, dev_t dev
)
652 struct md_rdev
*rdev
;
654 rdev_for_each_rcu(rdev
, mddev
)
655 if (rdev
->bdev
->bd_dev
== dev
)
661 static struct md_personality
*find_pers(int level
, char *clevel
)
663 struct md_personality
*pers
;
664 list_for_each_entry(pers
, &pers_list
, list
) {
665 if (level
!= LEVEL_NONE
&& pers
->level
== level
)
667 if (strcmp(pers
->name
, clevel
)==0)
673 /* return the offset of the super block in 512byte sectors */
674 static inline sector_t
calc_dev_sboffset(struct md_rdev
*rdev
)
676 sector_t num_sectors
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
677 return MD_NEW_SIZE_SECTORS(num_sectors
);
680 static int alloc_disk_sb(struct md_rdev
*rdev
)
682 rdev
->sb_page
= alloc_page(GFP_KERNEL
);
688 void md_rdev_clear(struct md_rdev
*rdev
)
691 put_page(rdev
->sb_page
);
693 rdev
->sb_page
= NULL
;
698 put_page(rdev
->bb_page
);
699 rdev
->bb_page
= NULL
;
701 badblocks_exit(&rdev
->badblocks
);
703 EXPORT_SYMBOL_GPL(md_rdev_clear
);
705 static void super_written(struct bio
*bio
)
707 struct md_rdev
*rdev
= bio
->bi_private
;
708 struct mddev
*mddev
= rdev
->mddev
;
711 pr_err("md: super_written gets error=%d\n", bio
->bi_error
);
712 md_error(mddev
, rdev
);
713 if (!test_bit(Faulty
, &rdev
->flags
)
714 && (bio
->bi_opf
& MD_FAILFAST
)) {
715 set_bit(MD_SB_NEED_REWRITE
, &mddev
->sb_flags
);
716 set_bit(LastDev
, &rdev
->flags
);
719 clear_bit(LastDev
, &rdev
->flags
);
721 if (atomic_dec_and_test(&mddev
->pending_writes
))
722 wake_up(&mddev
->sb_wait
);
723 rdev_dec_pending(rdev
, mddev
);
727 void md_super_write(struct mddev
*mddev
, struct md_rdev
*rdev
,
728 sector_t sector
, int size
, struct page
*page
)
730 /* write first size bytes of page to sector of rdev
731 * Increment mddev->pending_writes before returning
732 * and decrement it on completion, waking up sb_wait
733 * if zero is reached.
734 * If an error occurred, call md_error
739 if (test_bit(Faulty
, &rdev
->flags
))
742 bio
= bio_alloc_mddev(GFP_NOIO
, 1, mddev
);
744 atomic_inc(&rdev
->nr_pending
);
746 bio
->bi_bdev
= rdev
->meta_bdev
? rdev
->meta_bdev
: rdev
->bdev
;
747 bio
->bi_iter
.bi_sector
= sector
;
748 bio_add_page(bio
, page
, size
, 0);
749 bio
->bi_private
= rdev
;
750 bio
->bi_end_io
= super_written
;
752 if (test_bit(MD_FAILFAST_SUPPORTED
, &mddev
->flags
) &&
753 test_bit(FailFast
, &rdev
->flags
) &&
754 !test_bit(LastDev
, &rdev
->flags
))
756 bio
->bi_opf
= REQ_OP_WRITE
| REQ_PREFLUSH
| REQ_FUA
| ff
;
758 atomic_inc(&mddev
->pending_writes
);
762 int md_super_wait(struct mddev
*mddev
)
764 /* wait for all superblock writes that were scheduled to complete */
765 wait_event(mddev
->sb_wait
, atomic_read(&mddev
->pending_writes
)==0);
766 if (test_and_clear_bit(MD_SB_NEED_REWRITE
, &mddev
->sb_flags
))
771 int sync_page_io(struct md_rdev
*rdev
, sector_t sector
, int size
,
772 struct page
*page
, int op
, int op_flags
, bool metadata_op
)
774 struct bio
*bio
= bio_alloc_mddev(GFP_NOIO
, 1, rdev
->mddev
);
777 bio
->bi_bdev
= (metadata_op
&& rdev
->meta_bdev
) ?
778 rdev
->meta_bdev
: rdev
->bdev
;
779 bio_set_op_attrs(bio
, op
, op_flags
);
781 bio
->bi_iter
.bi_sector
= sector
+ rdev
->sb_start
;
782 else if (rdev
->mddev
->reshape_position
!= MaxSector
&&
783 (rdev
->mddev
->reshape_backwards
==
784 (sector
>= rdev
->mddev
->reshape_position
)))
785 bio
->bi_iter
.bi_sector
= sector
+ rdev
->new_data_offset
;
787 bio
->bi_iter
.bi_sector
= sector
+ rdev
->data_offset
;
788 bio_add_page(bio
, page
, size
, 0);
790 submit_bio_wait(bio
);
792 ret
= !bio
->bi_error
;
796 EXPORT_SYMBOL_GPL(sync_page_io
);
798 static int read_disk_sb(struct md_rdev
*rdev
, int size
)
800 char b
[BDEVNAME_SIZE
];
805 if (!sync_page_io(rdev
, 0, size
, rdev
->sb_page
, REQ_OP_READ
, 0, true))
811 pr_err("md: disabled device %s, could not read superblock.\n",
812 bdevname(rdev
->bdev
,b
));
816 static int uuid_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
818 return sb1
->set_uuid0
== sb2
->set_uuid0
&&
819 sb1
->set_uuid1
== sb2
->set_uuid1
&&
820 sb1
->set_uuid2
== sb2
->set_uuid2
&&
821 sb1
->set_uuid3
== sb2
->set_uuid3
;
824 static int sb_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
827 mdp_super_t
*tmp1
, *tmp2
;
829 tmp1
= kmalloc(sizeof(*tmp1
),GFP_KERNEL
);
830 tmp2
= kmalloc(sizeof(*tmp2
),GFP_KERNEL
);
832 if (!tmp1
|| !tmp2
) {
841 * nr_disks is not constant
846 ret
= (memcmp(tmp1
, tmp2
, MD_SB_GENERIC_CONSTANT_WORDS
* 4) == 0);
853 static u32
md_csum_fold(u32 csum
)
855 csum
= (csum
& 0xffff) + (csum
>> 16);
856 return (csum
& 0xffff) + (csum
>> 16);
859 static unsigned int calc_sb_csum(mdp_super_t
*sb
)
862 u32
*sb32
= (u32
*)sb
;
864 unsigned int disk_csum
, csum
;
866 disk_csum
= sb
->sb_csum
;
869 for (i
= 0; i
< MD_SB_BYTES
/4 ; i
++)
871 csum
= (newcsum
& 0xffffffff) + (newcsum
>>32);
874 /* This used to use csum_partial, which was wrong for several
875 * reasons including that different results are returned on
876 * different architectures. It isn't critical that we get exactly
877 * the same return value as before (we always csum_fold before
878 * testing, and that removes any differences). However as we
879 * know that csum_partial always returned a 16bit value on
880 * alphas, do a fold to maximise conformity to previous behaviour.
882 sb
->sb_csum
= md_csum_fold(disk_csum
);
884 sb
->sb_csum
= disk_csum
;
890 * Handle superblock details.
891 * We want to be able to handle multiple superblock formats
892 * so we have a common interface to them all, and an array of
893 * different handlers.
894 * We rely on user-space to write the initial superblock, and support
895 * reading and updating of superblocks.
896 * Interface methods are:
897 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version)
898 * loads and validates a superblock on dev.
899 * if refdev != NULL, compare superblocks on both devices
901 * 0 - dev has a superblock that is compatible with refdev
902 * 1 - dev has a superblock that is compatible and newer than refdev
903 * so dev should be used as the refdev in future
904 * -EINVAL superblock incompatible or invalid
905 * -othererror e.g. -EIO
907 * int validate_super(struct mddev *mddev, struct md_rdev *dev)
908 * Verify that dev is acceptable into mddev.
909 * The first time, mddev->raid_disks will be 0, and data from
910 * dev should be merged in. Subsequent calls check that dev
911 * is new enough. Return 0 or -EINVAL
913 * void sync_super(struct mddev *mddev, struct md_rdev *dev)
914 * Update the superblock for rdev with data in mddev
915 * This does not write to disc.
921 struct module
*owner
;
922 int (*load_super
)(struct md_rdev
*rdev
,
923 struct md_rdev
*refdev
,
925 int (*validate_super
)(struct mddev
*mddev
,
926 struct md_rdev
*rdev
);
927 void (*sync_super
)(struct mddev
*mddev
,
928 struct md_rdev
*rdev
);
929 unsigned long long (*rdev_size_change
)(struct md_rdev
*rdev
,
930 sector_t num_sectors
);
931 int (*allow_new_offset
)(struct md_rdev
*rdev
,
932 unsigned long long new_offset
);
936 * Check that the given mddev has no bitmap.
938 * This function is called from the run method of all personalities that do not
939 * support bitmaps. It prints an error message and returns non-zero if mddev
940 * has a bitmap. Otherwise, it returns 0.
943 int md_check_no_bitmap(struct mddev
*mddev
)
945 if (!mddev
->bitmap_info
.file
&& !mddev
->bitmap_info
.offset
)
947 pr_warn("%s: bitmaps are not supported for %s\n",
948 mdname(mddev
), mddev
->pers
->name
);
951 EXPORT_SYMBOL(md_check_no_bitmap
);
954 * load_super for 0.90.0
956 static int super_90_load(struct md_rdev
*rdev
, struct md_rdev
*refdev
, int minor_version
)
958 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
963 * Calculate the position of the superblock (512byte sectors),
964 * it's at the end of the disk.
966 * It also happens to be a multiple of 4Kb.
968 rdev
->sb_start
= calc_dev_sboffset(rdev
);
970 ret
= read_disk_sb(rdev
, MD_SB_BYTES
);
976 bdevname(rdev
->bdev
, b
);
977 sb
= page_address(rdev
->sb_page
);
979 if (sb
->md_magic
!= MD_SB_MAGIC
) {
980 pr_warn("md: invalid raid superblock magic on %s\n", b
);
984 if (sb
->major_version
!= 0 ||
985 sb
->minor_version
< 90 ||
986 sb
->minor_version
> 91) {
987 pr_warn("Bad version number %d.%d on %s\n",
988 sb
->major_version
, sb
->minor_version
, b
);
992 if (sb
->raid_disks
<= 0)
995 if (md_csum_fold(calc_sb_csum(sb
)) != md_csum_fold(sb
->sb_csum
)) {
996 pr_warn("md: invalid superblock checksum on %s\n", b
);
1000 rdev
->preferred_minor
= sb
->md_minor
;
1001 rdev
->data_offset
= 0;
1002 rdev
->new_data_offset
= 0;
1003 rdev
->sb_size
= MD_SB_BYTES
;
1004 rdev
->badblocks
.shift
= -1;
1006 if (sb
->level
== LEVEL_MULTIPATH
)
1009 rdev
->desc_nr
= sb
->this_disk
.number
;
1015 mdp_super_t
*refsb
= page_address(refdev
->sb_page
);
1016 if (!uuid_equal(refsb
, sb
)) {
1017 pr_warn("md: %s has different UUID to %s\n",
1018 b
, bdevname(refdev
->bdev
,b2
));
1021 if (!sb_equal(refsb
, sb
)) {
1022 pr_warn("md: %s has same UUID but different superblock to %s\n",
1023 b
, bdevname(refdev
->bdev
, b2
));
1027 ev2
= md_event(refsb
);
1033 rdev
->sectors
= rdev
->sb_start
;
1034 /* Limit to 4TB as metadata cannot record more than that.
1035 * (not needed for Linear and RAID0 as metadata doesn't
1038 if (IS_ENABLED(CONFIG_LBDAF
) && (u64
)rdev
->sectors
>= (2ULL << 32) &&
1040 rdev
->sectors
= (sector_t
)(2ULL << 32) - 2;
1042 if (rdev
->sectors
< ((sector_t
)sb
->size
) * 2 && sb
->level
>= 1)
1043 /* "this cannot possibly happen" ... */
1051 * validate_super for 0.90.0
1053 static int super_90_validate(struct mddev
*mddev
, struct md_rdev
*rdev
)
1056 mdp_super_t
*sb
= page_address(rdev
->sb_page
);
1057 __u64 ev1
= md_event(sb
);
1059 rdev
->raid_disk
= -1;
1060 clear_bit(Faulty
, &rdev
->flags
);
1061 clear_bit(In_sync
, &rdev
->flags
);
1062 clear_bit(Bitmap_sync
, &rdev
->flags
);
1063 clear_bit(WriteMostly
, &rdev
->flags
);
1065 if (mddev
->raid_disks
== 0) {
1066 mddev
->major_version
= 0;
1067 mddev
->minor_version
= sb
->minor_version
;
1068 mddev
->patch_version
= sb
->patch_version
;
1069 mddev
->external
= 0;
1070 mddev
->chunk_sectors
= sb
->chunk_size
>> 9;
1071 mddev
->ctime
= sb
->ctime
;
1072 mddev
->utime
= sb
->utime
;
1073 mddev
->level
= sb
->level
;
1074 mddev
->clevel
[0] = 0;
1075 mddev
->layout
= sb
->layout
;
1076 mddev
->raid_disks
= sb
->raid_disks
;
1077 mddev
->dev_sectors
= ((sector_t
)sb
->size
) * 2;
1078 mddev
->events
= ev1
;
1079 mddev
->bitmap_info
.offset
= 0;
1080 mddev
->bitmap_info
.space
= 0;
1081 /* bitmap can use 60 K after the 4K superblocks */
1082 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
1083 mddev
->bitmap_info
.default_space
= 64*2 - (MD_SB_BYTES
>> 9);
1084 mddev
->reshape_backwards
= 0;
1086 if (mddev
->minor_version
>= 91) {
1087 mddev
->reshape_position
= sb
->reshape_position
;
1088 mddev
->delta_disks
= sb
->delta_disks
;
1089 mddev
->new_level
= sb
->new_level
;
1090 mddev
->new_layout
= sb
->new_layout
;
1091 mddev
->new_chunk_sectors
= sb
->new_chunk
>> 9;
1092 if (mddev
->delta_disks
< 0)
1093 mddev
->reshape_backwards
= 1;
1095 mddev
->reshape_position
= MaxSector
;
1096 mddev
->delta_disks
= 0;
1097 mddev
->new_level
= mddev
->level
;
1098 mddev
->new_layout
= mddev
->layout
;
1099 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1102 if (sb
->state
& (1<<MD_SB_CLEAN
))
1103 mddev
->recovery_cp
= MaxSector
;
1105 if (sb
->events_hi
== sb
->cp_events_hi
&&
1106 sb
->events_lo
== sb
->cp_events_lo
) {
1107 mddev
->recovery_cp
= sb
->recovery_cp
;
1109 mddev
->recovery_cp
= 0;
1112 memcpy(mddev
->uuid
+0, &sb
->set_uuid0
, 4);
1113 memcpy(mddev
->uuid
+4, &sb
->set_uuid1
, 4);
1114 memcpy(mddev
->uuid
+8, &sb
->set_uuid2
, 4);
1115 memcpy(mddev
->uuid
+12,&sb
->set_uuid3
, 4);
1117 mddev
->max_disks
= MD_SB_DISKS
;
1119 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
) &&
1120 mddev
->bitmap_info
.file
== NULL
) {
1121 mddev
->bitmap_info
.offset
=
1122 mddev
->bitmap_info
.default_offset
;
1123 mddev
->bitmap_info
.space
=
1124 mddev
->bitmap_info
.default_space
;
1127 } else if (mddev
->pers
== NULL
) {
1128 /* Insist on good event counter while assembling, except
1129 * for spares (which don't need an event count) */
1131 if (sb
->disks
[rdev
->desc_nr
].state
& (
1132 (1<<MD_DISK_SYNC
) | (1 << MD_DISK_ACTIVE
)))
1133 if (ev1
< mddev
->events
)
1135 } else if (mddev
->bitmap
) {
1136 /* if adding to array with a bitmap, then we can accept an
1137 * older device ... but not too old.
1139 if (ev1
< mddev
->bitmap
->events_cleared
)
1141 if (ev1
< mddev
->events
)
1142 set_bit(Bitmap_sync
, &rdev
->flags
);
1144 if (ev1
< mddev
->events
)
1145 /* just a hot-add of a new device, leave raid_disk at -1 */
1149 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1150 desc
= sb
->disks
+ rdev
->desc_nr
;
1152 if (desc
->state
& (1<<MD_DISK_FAULTY
))
1153 set_bit(Faulty
, &rdev
->flags
);
1154 else if (desc
->state
& (1<<MD_DISK_SYNC
) /* &&
1155 desc->raid_disk < mddev->raid_disks */) {
1156 set_bit(In_sync
, &rdev
->flags
);
1157 rdev
->raid_disk
= desc
->raid_disk
;
1158 rdev
->saved_raid_disk
= desc
->raid_disk
;
1159 } else if (desc
->state
& (1<<MD_DISK_ACTIVE
)) {
1160 /* active but not in sync implies recovery up to
1161 * reshape position. We don't know exactly where
1162 * that is, so set to zero for now */
1163 if (mddev
->minor_version
>= 91) {
1164 rdev
->recovery_offset
= 0;
1165 rdev
->raid_disk
= desc
->raid_disk
;
1168 if (desc
->state
& (1<<MD_DISK_WRITEMOSTLY
))
1169 set_bit(WriteMostly
, &rdev
->flags
);
1170 if (desc
->state
& (1<<MD_DISK_FAILFAST
))
1171 set_bit(FailFast
, &rdev
->flags
);
1172 } else /* MULTIPATH are always insync */
1173 set_bit(In_sync
, &rdev
->flags
);
1178 * sync_super for 0.90.0
1180 static void super_90_sync(struct mddev
*mddev
, struct md_rdev
*rdev
)
1183 struct md_rdev
*rdev2
;
1184 int next_spare
= mddev
->raid_disks
;
1186 /* make rdev->sb match mddev data..
1189 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1190 * 3/ any empty disks < next_spare become removed
1192 * disks[0] gets initialised to REMOVED because
1193 * we cannot be sure from other fields if it has
1194 * been initialised or not.
1197 int active
=0, working
=0,failed
=0,spare
=0,nr_disks
=0;
1199 rdev
->sb_size
= MD_SB_BYTES
;
1201 sb
= page_address(rdev
->sb_page
);
1203 memset(sb
, 0, sizeof(*sb
));
1205 sb
->md_magic
= MD_SB_MAGIC
;
1206 sb
->major_version
= mddev
->major_version
;
1207 sb
->patch_version
= mddev
->patch_version
;
1208 sb
->gvalid_words
= 0; /* ignored */
1209 memcpy(&sb
->set_uuid0
, mddev
->uuid
+0, 4);
1210 memcpy(&sb
->set_uuid1
, mddev
->uuid
+4, 4);
1211 memcpy(&sb
->set_uuid2
, mddev
->uuid
+8, 4);
1212 memcpy(&sb
->set_uuid3
, mddev
->uuid
+12,4);
1214 sb
->ctime
= clamp_t(time64_t
, mddev
->ctime
, 0, U32_MAX
);
1215 sb
->level
= mddev
->level
;
1216 sb
->size
= mddev
->dev_sectors
/ 2;
1217 sb
->raid_disks
= mddev
->raid_disks
;
1218 sb
->md_minor
= mddev
->md_minor
;
1219 sb
->not_persistent
= 0;
1220 sb
->utime
= clamp_t(time64_t
, mddev
->utime
, 0, U32_MAX
);
1222 sb
->events_hi
= (mddev
->events
>>32);
1223 sb
->events_lo
= (u32
)mddev
->events
;
1225 if (mddev
->reshape_position
== MaxSector
)
1226 sb
->minor_version
= 90;
1228 sb
->minor_version
= 91;
1229 sb
->reshape_position
= mddev
->reshape_position
;
1230 sb
->new_level
= mddev
->new_level
;
1231 sb
->delta_disks
= mddev
->delta_disks
;
1232 sb
->new_layout
= mddev
->new_layout
;
1233 sb
->new_chunk
= mddev
->new_chunk_sectors
<< 9;
1235 mddev
->minor_version
= sb
->minor_version
;
1238 sb
->recovery_cp
= mddev
->recovery_cp
;
1239 sb
->cp_events_hi
= (mddev
->events
>>32);
1240 sb
->cp_events_lo
= (u32
)mddev
->events
;
1241 if (mddev
->recovery_cp
== MaxSector
)
1242 sb
->state
= (1<< MD_SB_CLEAN
);
1244 sb
->recovery_cp
= 0;
1246 sb
->layout
= mddev
->layout
;
1247 sb
->chunk_size
= mddev
->chunk_sectors
<< 9;
1249 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
)
1250 sb
->state
|= (1<<MD_SB_BITMAP_PRESENT
);
1252 sb
->disks
[0].state
= (1<<MD_DISK_REMOVED
);
1253 rdev_for_each(rdev2
, mddev
) {
1256 int is_active
= test_bit(In_sync
, &rdev2
->flags
);
1258 if (rdev2
->raid_disk
>= 0 &&
1259 sb
->minor_version
>= 91)
1260 /* we have nowhere to store the recovery_offset,
1261 * but if it is not below the reshape_position,
1262 * we can piggy-back on that.
1265 if (rdev2
->raid_disk
< 0 ||
1266 test_bit(Faulty
, &rdev2
->flags
))
1269 desc_nr
= rdev2
->raid_disk
;
1271 desc_nr
= next_spare
++;
1272 rdev2
->desc_nr
= desc_nr
;
1273 d
= &sb
->disks
[rdev2
->desc_nr
];
1275 d
->number
= rdev2
->desc_nr
;
1276 d
->major
= MAJOR(rdev2
->bdev
->bd_dev
);
1277 d
->minor
= MINOR(rdev2
->bdev
->bd_dev
);
1279 d
->raid_disk
= rdev2
->raid_disk
;
1281 d
->raid_disk
= rdev2
->desc_nr
; /* compatibility */
1282 if (test_bit(Faulty
, &rdev2
->flags
))
1283 d
->state
= (1<<MD_DISK_FAULTY
);
1284 else if (is_active
) {
1285 d
->state
= (1<<MD_DISK_ACTIVE
);
1286 if (test_bit(In_sync
, &rdev2
->flags
))
1287 d
->state
|= (1<<MD_DISK_SYNC
);
1295 if (test_bit(WriteMostly
, &rdev2
->flags
))
1296 d
->state
|= (1<<MD_DISK_WRITEMOSTLY
);
1297 if (test_bit(FailFast
, &rdev2
->flags
))
1298 d
->state
|= (1<<MD_DISK_FAILFAST
);
1300 /* now set the "removed" and "faulty" bits on any missing devices */
1301 for (i
=0 ; i
< mddev
->raid_disks
; i
++) {
1302 mdp_disk_t
*d
= &sb
->disks
[i
];
1303 if (d
->state
== 0 && d
->number
== 0) {
1306 d
->state
= (1<<MD_DISK_REMOVED
);
1307 d
->state
|= (1<<MD_DISK_FAULTY
);
1311 sb
->nr_disks
= nr_disks
;
1312 sb
->active_disks
= active
;
1313 sb
->working_disks
= working
;
1314 sb
->failed_disks
= failed
;
1315 sb
->spare_disks
= spare
;
1317 sb
->this_disk
= sb
->disks
[rdev
->desc_nr
];
1318 sb
->sb_csum
= calc_sb_csum(sb
);
1322 * rdev_size_change for 0.90.0
1324 static unsigned long long
1325 super_90_rdev_size_change(struct md_rdev
*rdev
, sector_t num_sectors
)
1327 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1328 return 0; /* component must fit device */
1329 if (rdev
->mddev
->bitmap_info
.offset
)
1330 return 0; /* can't move bitmap */
1331 rdev
->sb_start
= calc_dev_sboffset(rdev
);
1332 if (!num_sectors
|| num_sectors
> rdev
->sb_start
)
1333 num_sectors
= rdev
->sb_start
;
1334 /* Limit to 4TB as metadata cannot record more than that.
1335 * 4TB == 2^32 KB, or 2*2^32 sectors.
1337 if (IS_ENABLED(CONFIG_LBDAF
) && (u64
)num_sectors
>= (2ULL << 32) &&
1338 rdev
->mddev
->level
>= 1)
1339 num_sectors
= (sector_t
)(2ULL << 32) - 2;
1341 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1343 } while (md_super_wait(rdev
->mddev
) < 0);
1348 super_90_allow_new_offset(struct md_rdev
*rdev
, unsigned long long new_offset
)
1350 /* non-zero offset changes not possible with v0.90 */
1351 return new_offset
== 0;
1355 * version 1 superblock
1358 static __le32
calc_sb_1_csum(struct mdp_superblock_1
*sb
)
1362 unsigned long long newcsum
;
1363 int size
= 256 + le32_to_cpu(sb
->max_dev
)*2;
1364 __le32
*isuper
= (__le32
*)sb
;
1366 disk_csum
= sb
->sb_csum
;
1369 for (; size
>= 4; size
-= 4)
1370 newcsum
+= le32_to_cpu(*isuper
++);
1373 newcsum
+= le16_to_cpu(*(__le16
*) isuper
);
1375 csum
= (newcsum
& 0xffffffff) + (newcsum
>> 32);
1376 sb
->sb_csum
= disk_csum
;
1377 return cpu_to_le32(csum
);
1380 static int super_1_load(struct md_rdev
*rdev
, struct md_rdev
*refdev
, int minor_version
)
1382 struct mdp_superblock_1
*sb
;
1386 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1390 * Calculate the position of the superblock in 512byte sectors.
1391 * It is always aligned to a 4K boundary and
1392 * depeding on minor_version, it can be:
1393 * 0: At least 8K, but less than 12K, from end of device
1394 * 1: At start of device
1395 * 2: 4K from start of device.
1397 switch(minor_version
) {
1399 sb_start
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1401 sb_start
&= ~(sector_t
)(4*2-1);
1412 rdev
->sb_start
= sb_start
;
1414 /* superblock is rarely larger than 1K, but it can be larger,
1415 * and it is safe to read 4k, so we do that
1417 ret
= read_disk_sb(rdev
, 4096);
1418 if (ret
) return ret
;
1420 sb
= page_address(rdev
->sb_page
);
1422 if (sb
->magic
!= cpu_to_le32(MD_SB_MAGIC
) ||
1423 sb
->major_version
!= cpu_to_le32(1) ||
1424 le32_to_cpu(sb
->max_dev
) > (4096-256)/2 ||
1425 le64_to_cpu(sb
->super_offset
) != rdev
->sb_start
||
1426 (le32_to_cpu(sb
->feature_map
) & ~MD_FEATURE_ALL
) != 0)
1429 if (calc_sb_1_csum(sb
) != sb
->sb_csum
) {
1430 pr_warn("md: invalid superblock checksum on %s\n",
1431 bdevname(rdev
->bdev
,b
));
1434 if (le64_to_cpu(sb
->data_size
) < 10) {
1435 pr_warn("md: data_size too small on %s\n",
1436 bdevname(rdev
->bdev
,b
));
1441 memcmp(sb
->pad3
, sb
->pad3
+1, sizeof(sb
->pad3
) - sizeof(sb
->pad3
[1])))
1442 /* Some padding is non-zero, might be a new feature */
1445 rdev
->preferred_minor
= 0xffff;
1446 rdev
->data_offset
= le64_to_cpu(sb
->data_offset
);
1447 rdev
->new_data_offset
= rdev
->data_offset
;
1448 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
) &&
1449 (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_NEW_OFFSET
))
1450 rdev
->new_data_offset
+= (s32
)le32_to_cpu(sb
->new_offset
);
1451 atomic_set(&rdev
->corrected_errors
, le32_to_cpu(sb
->cnt_corrected_read
));
1453 rdev
->sb_size
= le32_to_cpu(sb
->max_dev
) * 2 + 256;
1454 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1455 if (rdev
->sb_size
& bmask
)
1456 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1459 && rdev
->data_offset
< sb_start
+ (rdev
->sb_size
/512))
1462 && rdev
->new_data_offset
< sb_start
+ (rdev
->sb_size
/512))
1465 if (sb
->level
== cpu_to_le32(LEVEL_MULTIPATH
))
1468 rdev
->desc_nr
= le32_to_cpu(sb
->dev_number
);
1470 if (!rdev
->bb_page
) {
1471 rdev
->bb_page
= alloc_page(GFP_KERNEL
);
1475 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BAD_BLOCKS
) &&
1476 rdev
->badblocks
.count
== 0) {
1477 /* need to load the bad block list.
1478 * Currently we limit it to one page.
1484 int sectors
= le16_to_cpu(sb
->bblog_size
);
1485 if (sectors
> (PAGE_SIZE
/ 512))
1487 offset
= le32_to_cpu(sb
->bblog_offset
);
1490 bb_sector
= (long long)offset
;
1491 if (!sync_page_io(rdev
, bb_sector
, sectors
<< 9,
1492 rdev
->bb_page
, REQ_OP_READ
, 0, true))
1494 bbp
= (u64
*)page_address(rdev
->bb_page
);
1495 rdev
->badblocks
.shift
= sb
->bblog_shift
;
1496 for (i
= 0 ; i
< (sectors
<< (9-3)) ; i
++, bbp
++) {
1497 u64 bb
= le64_to_cpu(*bbp
);
1498 int count
= bb
& (0x3ff);
1499 u64 sector
= bb
>> 10;
1500 sector
<<= sb
->bblog_shift
;
1501 count
<<= sb
->bblog_shift
;
1504 if (badblocks_set(&rdev
->badblocks
, sector
, count
, 1))
1507 } else if (sb
->bblog_offset
!= 0)
1508 rdev
->badblocks
.shift
= 0;
1510 if (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_PPL
) {
1511 rdev
->ppl
.offset
= (__s16
)le16_to_cpu(sb
->ppl
.offset
);
1512 rdev
->ppl
.size
= le16_to_cpu(sb
->ppl
.size
);
1513 rdev
->ppl
.sector
= rdev
->sb_start
+ rdev
->ppl
.offset
;
1520 struct mdp_superblock_1
*refsb
= page_address(refdev
->sb_page
);
1522 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16) != 0 ||
1523 sb
->level
!= refsb
->level
||
1524 sb
->layout
!= refsb
->layout
||
1525 sb
->chunksize
!= refsb
->chunksize
) {
1526 pr_warn("md: %s has strangely different superblock to %s\n",
1527 bdevname(rdev
->bdev
,b
),
1528 bdevname(refdev
->bdev
,b2
));
1531 ev1
= le64_to_cpu(sb
->events
);
1532 ev2
= le64_to_cpu(refsb
->events
);
1539 if (minor_version
) {
1540 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9);
1541 sectors
-= rdev
->data_offset
;
1543 sectors
= rdev
->sb_start
;
1544 if (sectors
< le64_to_cpu(sb
->data_size
))
1546 rdev
->sectors
= le64_to_cpu(sb
->data_size
);
1550 static int super_1_validate(struct mddev
*mddev
, struct md_rdev
*rdev
)
1552 struct mdp_superblock_1
*sb
= page_address(rdev
->sb_page
);
1553 __u64 ev1
= le64_to_cpu(sb
->events
);
1555 rdev
->raid_disk
= -1;
1556 clear_bit(Faulty
, &rdev
->flags
);
1557 clear_bit(In_sync
, &rdev
->flags
);
1558 clear_bit(Bitmap_sync
, &rdev
->flags
);
1559 clear_bit(WriteMostly
, &rdev
->flags
);
1561 if (mddev
->raid_disks
== 0) {
1562 mddev
->major_version
= 1;
1563 mddev
->patch_version
= 0;
1564 mddev
->external
= 0;
1565 mddev
->chunk_sectors
= le32_to_cpu(sb
->chunksize
);
1566 mddev
->ctime
= le64_to_cpu(sb
->ctime
);
1567 mddev
->utime
= le64_to_cpu(sb
->utime
);
1568 mddev
->level
= le32_to_cpu(sb
->level
);
1569 mddev
->clevel
[0] = 0;
1570 mddev
->layout
= le32_to_cpu(sb
->layout
);
1571 mddev
->raid_disks
= le32_to_cpu(sb
->raid_disks
);
1572 mddev
->dev_sectors
= le64_to_cpu(sb
->size
);
1573 mddev
->events
= ev1
;
1574 mddev
->bitmap_info
.offset
= 0;
1575 mddev
->bitmap_info
.space
= 0;
1576 /* Default location for bitmap is 1K after superblock
1577 * using 3K - total of 4K
1579 mddev
->bitmap_info
.default_offset
= 1024 >> 9;
1580 mddev
->bitmap_info
.default_space
= (4096-1024) >> 9;
1581 mddev
->reshape_backwards
= 0;
1583 mddev
->recovery_cp
= le64_to_cpu(sb
->resync_offset
);
1584 memcpy(mddev
->uuid
, sb
->set_uuid
, 16);
1586 mddev
->max_disks
= (4096-256)/2;
1588 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
) &&
1589 mddev
->bitmap_info
.file
== NULL
) {
1590 mddev
->bitmap_info
.offset
=
1591 (__s32
)le32_to_cpu(sb
->bitmap_offset
);
1592 /* Metadata doesn't record how much space is available.
1593 * For 1.0, we assume we can use up to the superblock
1594 * if before, else to 4K beyond superblock.
1595 * For others, assume no change is possible.
1597 if (mddev
->minor_version
> 0)
1598 mddev
->bitmap_info
.space
= 0;
1599 else if (mddev
->bitmap_info
.offset
> 0)
1600 mddev
->bitmap_info
.space
=
1601 8 - mddev
->bitmap_info
.offset
;
1603 mddev
->bitmap_info
.space
=
1604 -mddev
->bitmap_info
.offset
;
1607 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
1608 mddev
->reshape_position
= le64_to_cpu(sb
->reshape_position
);
1609 mddev
->delta_disks
= le32_to_cpu(sb
->delta_disks
);
1610 mddev
->new_level
= le32_to_cpu(sb
->new_level
);
1611 mddev
->new_layout
= le32_to_cpu(sb
->new_layout
);
1612 mddev
->new_chunk_sectors
= le32_to_cpu(sb
->new_chunk
);
1613 if (mddev
->delta_disks
< 0 ||
1614 (mddev
->delta_disks
== 0 &&
1615 (le32_to_cpu(sb
->feature_map
)
1616 & MD_FEATURE_RESHAPE_BACKWARDS
)))
1617 mddev
->reshape_backwards
= 1;
1619 mddev
->reshape_position
= MaxSector
;
1620 mddev
->delta_disks
= 0;
1621 mddev
->new_level
= mddev
->level
;
1622 mddev
->new_layout
= mddev
->layout
;
1623 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1626 if (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_JOURNAL
)
1627 set_bit(MD_HAS_JOURNAL
, &mddev
->flags
);
1629 if (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_PPL
) {
1630 if (le32_to_cpu(sb
->feature_map
) &
1631 (MD_FEATURE_BITMAP_OFFSET
| MD_FEATURE_JOURNAL
))
1633 set_bit(MD_HAS_PPL
, &mddev
->flags
);
1635 } else if (mddev
->pers
== NULL
) {
1636 /* Insist of good event counter while assembling, except for
1637 * spares (which don't need an event count) */
1639 if (rdev
->desc_nr
>= 0 &&
1640 rdev
->desc_nr
< le32_to_cpu(sb
->max_dev
) &&
1641 (le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]) < MD_DISK_ROLE_MAX
||
1642 le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]) == MD_DISK_ROLE_JOURNAL
))
1643 if (ev1
< mddev
->events
)
1645 } else if (mddev
->bitmap
) {
1646 /* If adding to array with a bitmap, then we can accept an
1647 * older device, but not too old.
1649 if (ev1
< mddev
->bitmap
->events_cleared
)
1651 if (ev1
< mddev
->events
)
1652 set_bit(Bitmap_sync
, &rdev
->flags
);
1654 if (ev1
< mddev
->events
)
1655 /* just a hot-add of a new device, leave raid_disk at -1 */
1658 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1660 if (rdev
->desc_nr
< 0 ||
1661 rdev
->desc_nr
>= le32_to_cpu(sb
->max_dev
)) {
1662 role
= MD_DISK_ROLE_SPARE
;
1665 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
1667 case MD_DISK_ROLE_SPARE
: /* spare */
1669 case MD_DISK_ROLE_FAULTY
: /* faulty */
1670 set_bit(Faulty
, &rdev
->flags
);
1672 case MD_DISK_ROLE_JOURNAL
: /* journal device */
1673 if (!(le32_to_cpu(sb
->feature_map
) & MD_FEATURE_JOURNAL
)) {
1674 /* journal device without journal feature */
1675 pr_warn("md: journal device provided without journal feature, ignoring the device\n");
1678 set_bit(Journal
, &rdev
->flags
);
1679 rdev
->journal_tail
= le64_to_cpu(sb
->journal_tail
);
1680 rdev
->raid_disk
= 0;
1683 rdev
->saved_raid_disk
= role
;
1684 if ((le32_to_cpu(sb
->feature_map
) &
1685 MD_FEATURE_RECOVERY_OFFSET
)) {
1686 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
1687 if (!(le32_to_cpu(sb
->feature_map
) &
1688 MD_FEATURE_RECOVERY_BITMAP
))
1689 rdev
->saved_raid_disk
= -1;
1691 set_bit(In_sync
, &rdev
->flags
);
1692 rdev
->raid_disk
= role
;
1695 if (sb
->devflags
& WriteMostly1
)
1696 set_bit(WriteMostly
, &rdev
->flags
);
1697 if (sb
->devflags
& FailFast1
)
1698 set_bit(FailFast
, &rdev
->flags
);
1699 if (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_REPLACEMENT
)
1700 set_bit(Replacement
, &rdev
->flags
);
1701 } else /* MULTIPATH are always insync */
1702 set_bit(In_sync
, &rdev
->flags
);
1707 static void super_1_sync(struct mddev
*mddev
, struct md_rdev
*rdev
)
1709 struct mdp_superblock_1
*sb
;
1710 struct md_rdev
*rdev2
;
1712 /* make rdev->sb match mddev and rdev data. */
1714 sb
= page_address(rdev
->sb_page
);
1716 sb
->feature_map
= 0;
1718 sb
->recovery_offset
= cpu_to_le64(0);
1719 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
1721 sb
->utime
= cpu_to_le64((__u64
)mddev
->utime
);
1722 sb
->events
= cpu_to_le64(mddev
->events
);
1724 sb
->resync_offset
= cpu_to_le64(mddev
->recovery_cp
);
1725 else if (test_bit(MD_JOURNAL_CLEAN
, &mddev
->flags
))
1726 sb
->resync_offset
= cpu_to_le64(MaxSector
);
1728 sb
->resync_offset
= cpu_to_le64(0);
1730 sb
->cnt_corrected_read
= cpu_to_le32(atomic_read(&rdev
->corrected_errors
));
1732 sb
->raid_disks
= cpu_to_le32(mddev
->raid_disks
);
1733 sb
->size
= cpu_to_le64(mddev
->dev_sectors
);
1734 sb
->chunksize
= cpu_to_le32(mddev
->chunk_sectors
);
1735 sb
->level
= cpu_to_le32(mddev
->level
);
1736 sb
->layout
= cpu_to_le32(mddev
->layout
);
1737 if (test_bit(FailFast
, &rdev
->flags
))
1738 sb
->devflags
|= FailFast1
;
1740 sb
->devflags
&= ~FailFast1
;
1742 if (test_bit(WriteMostly
, &rdev
->flags
))
1743 sb
->devflags
|= WriteMostly1
;
1745 sb
->devflags
&= ~WriteMostly1
;
1746 sb
->data_offset
= cpu_to_le64(rdev
->data_offset
);
1747 sb
->data_size
= cpu_to_le64(rdev
->sectors
);
1749 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
) {
1750 sb
->bitmap_offset
= cpu_to_le32((__u32
)mddev
->bitmap_info
.offset
);
1751 sb
->feature_map
= cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
);
1754 if (rdev
->raid_disk
>= 0 && !test_bit(Journal
, &rdev
->flags
) &&
1755 !test_bit(In_sync
, &rdev
->flags
)) {
1757 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET
);
1758 sb
->recovery_offset
=
1759 cpu_to_le64(rdev
->recovery_offset
);
1760 if (rdev
->saved_raid_disk
>= 0 && mddev
->bitmap
)
1762 cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP
);
1764 /* Note: recovery_offset and journal_tail share space */
1765 if (test_bit(Journal
, &rdev
->flags
))
1766 sb
->journal_tail
= cpu_to_le64(rdev
->journal_tail
);
1767 if (test_bit(Replacement
, &rdev
->flags
))
1769 cpu_to_le32(MD_FEATURE_REPLACEMENT
);
1771 if (mddev
->reshape_position
!= MaxSector
) {
1772 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE
);
1773 sb
->reshape_position
= cpu_to_le64(mddev
->reshape_position
);
1774 sb
->new_layout
= cpu_to_le32(mddev
->new_layout
);
1775 sb
->delta_disks
= cpu_to_le32(mddev
->delta_disks
);
1776 sb
->new_level
= cpu_to_le32(mddev
->new_level
);
1777 sb
->new_chunk
= cpu_to_le32(mddev
->new_chunk_sectors
);
1778 if (mddev
->delta_disks
== 0 &&
1779 mddev
->reshape_backwards
)
1781 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS
);
1782 if (rdev
->new_data_offset
!= rdev
->data_offset
) {
1784 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET
);
1785 sb
->new_offset
= cpu_to_le32((__u32
)(rdev
->new_data_offset
1786 - rdev
->data_offset
));
1790 if (mddev_is_clustered(mddev
))
1791 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_CLUSTERED
);
1793 if (rdev
->badblocks
.count
== 0)
1794 /* Nothing to do for bad blocks*/ ;
1795 else if (sb
->bblog_offset
== 0)
1796 /* Cannot record bad blocks on this device */
1797 md_error(mddev
, rdev
);
1799 struct badblocks
*bb
= &rdev
->badblocks
;
1800 u64
*bbp
= (u64
*)page_address(rdev
->bb_page
);
1802 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_BAD_BLOCKS
);
1807 seq
= read_seqbegin(&bb
->lock
);
1809 memset(bbp
, 0xff, PAGE_SIZE
);
1811 for (i
= 0 ; i
< bb
->count
; i
++) {
1812 u64 internal_bb
= p
[i
];
1813 u64 store_bb
= ((BB_OFFSET(internal_bb
) << 10)
1814 | BB_LEN(internal_bb
));
1815 bbp
[i
] = cpu_to_le64(store_bb
);
1818 if (read_seqretry(&bb
->lock
, seq
))
1821 bb
->sector
= (rdev
->sb_start
+
1822 (int)le32_to_cpu(sb
->bblog_offset
));
1823 bb
->size
= le16_to_cpu(sb
->bblog_size
);
1828 rdev_for_each(rdev2
, mddev
)
1829 if (rdev2
->desc_nr
+1 > max_dev
)
1830 max_dev
= rdev2
->desc_nr
+1;
1832 if (max_dev
> le32_to_cpu(sb
->max_dev
)) {
1834 sb
->max_dev
= cpu_to_le32(max_dev
);
1835 rdev
->sb_size
= max_dev
* 2 + 256;
1836 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1837 if (rdev
->sb_size
& bmask
)
1838 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1840 max_dev
= le32_to_cpu(sb
->max_dev
);
1842 for (i
=0; i
<max_dev
;i
++)
1843 sb
->dev_roles
[i
] = cpu_to_le16(MD_DISK_ROLE_FAULTY
);
1845 if (test_bit(MD_HAS_JOURNAL
, &mddev
->flags
))
1846 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_JOURNAL
);
1848 if (test_bit(MD_HAS_PPL
, &mddev
->flags
)) {
1849 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_PPL
);
1850 sb
->ppl
.offset
= cpu_to_le16(rdev
->ppl
.offset
);
1851 sb
->ppl
.size
= cpu_to_le16(rdev
->ppl
.size
);
1854 rdev_for_each(rdev2
, mddev
) {
1856 if (test_bit(Faulty
, &rdev2
->flags
))
1857 sb
->dev_roles
[i
] = cpu_to_le16(MD_DISK_ROLE_FAULTY
);
1858 else if (test_bit(In_sync
, &rdev2
->flags
))
1859 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1860 else if (test_bit(Journal
, &rdev2
->flags
))
1861 sb
->dev_roles
[i
] = cpu_to_le16(MD_DISK_ROLE_JOURNAL
);
1862 else if (rdev2
->raid_disk
>= 0)
1863 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1865 sb
->dev_roles
[i
] = cpu_to_le16(MD_DISK_ROLE_SPARE
);
1868 sb
->sb_csum
= calc_sb_1_csum(sb
);
1871 static unsigned long long
1872 super_1_rdev_size_change(struct md_rdev
*rdev
, sector_t num_sectors
)
1874 struct mdp_superblock_1
*sb
;
1875 sector_t max_sectors
;
1876 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1877 return 0; /* component must fit device */
1878 if (rdev
->data_offset
!= rdev
->new_data_offset
)
1879 return 0; /* too confusing */
1880 if (rdev
->sb_start
< rdev
->data_offset
) {
1881 /* minor versions 1 and 2; superblock before data */
1882 max_sectors
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1883 max_sectors
-= rdev
->data_offset
;
1884 if (!num_sectors
|| num_sectors
> max_sectors
)
1885 num_sectors
= max_sectors
;
1886 } else if (rdev
->mddev
->bitmap_info
.offset
) {
1887 /* minor version 0 with bitmap we can't move */
1890 /* minor version 0; superblock after data */
1892 sb_start
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) - 8*2;
1893 sb_start
&= ~(sector_t
)(4*2 - 1);
1894 max_sectors
= rdev
->sectors
+ sb_start
- rdev
->sb_start
;
1895 if (!num_sectors
|| num_sectors
> max_sectors
)
1896 num_sectors
= max_sectors
;
1897 rdev
->sb_start
= sb_start
;
1899 sb
= page_address(rdev
->sb_page
);
1900 sb
->data_size
= cpu_to_le64(num_sectors
);
1901 sb
->super_offset
= cpu_to_le64(rdev
->sb_start
);
1902 sb
->sb_csum
= calc_sb_1_csum(sb
);
1904 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1906 } while (md_super_wait(rdev
->mddev
) < 0);
1912 super_1_allow_new_offset(struct md_rdev
*rdev
,
1913 unsigned long long new_offset
)
1915 /* All necessary checks on new >= old have been done */
1916 struct bitmap
*bitmap
;
1917 if (new_offset
>= rdev
->data_offset
)
1920 /* with 1.0 metadata, there is no metadata to tread on
1921 * so we can always move back */
1922 if (rdev
->mddev
->minor_version
== 0)
1925 /* otherwise we must be sure not to step on
1926 * any metadata, so stay:
1927 * 36K beyond start of superblock
1928 * beyond end of badblocks
1929 * beyond write-intent bitmap
1931 if (rdev
->sb_start
+ (32+4)*2 > new_offset
)
1933 bitmap
= rdev
->mddev
->bitmap
;
1934 if (bitmap
&& !rdev
->mddev
->bitmap_info
.file
&&
1935 rdev
->sb_start
+ rdev
->mddev
->bitmap_info
.offset
+
1936 bitmap
->storage
.file_pages
* (PAGE_SIZE
>>9) > new_offset
)
1938 if (rdev
->badblocks
.sector
+ rdev
->badblocks
.size
> new_offset
)
1944 static struct super_type super_types
[] = {
1947 .owner
= THIS_MODULE
,
1948 .load_super
= super_90_load
,
1949 .validate_super
= super_90_validate
,
1950 .sync_super
= super_90_sync
,
1951 .rdev_size_change
= super_90_rdev_size_change
,
1952 .allow_new_offset
= super_90_allow_new_offset
,
1956 .owner
= THIS_MODULE
,
1957 .load_super
= super_1_load
,
1958 .validate_super
= super_1_validate
,
1959 .sync_super
= super_1_sync
,
1960 .rdev_size_change
= super_1_rdev_size_change
,
1961 .allow_new_offset
= super_1_allow_new_offset
,
1965 static void sync_super(struct mddev
*mddev
, struct md_rdev
*rdev
)
1967 if (mddev
->sync_super
) {
1968 mddev
->sync_super(mddev
, rdev
);
1972 BUG_ON(mddev
->major_version
>= ARRAY_SIZE(super_types
));
1974 super_types
[mddev
->major_version
].sync_super(mddev
, rdev
);
1977 static int match_mddev_units(struct mddev
*mddev1
, struct mddev
*mddev2
)
1979 struct md_rdev
*rdev
, *rdev2
;
1982 rdev_for_each_rcu(rdev
, mddev1
) {
1983 if (test_bit(Faulty
, &rdev
->flags
) ||
1984 test_bit(Journal
, &rdev
->flags
) ||
1985 rdev
->raid_disk
== -1)
1987 rdev_for_each_rcu(rdev2
, mddev2
) {
1988 if (test_bit(Faulty
, &rdev2
->flags
) ||
1989 test_bit(Journal
, &rdev2
->flags
) ||
1990 rdev2
->raid_disk
== -1)
1992 if (rdev
->bdev
->bd_contains
==
1993 rdev2
->bdev
->bd_contains
) {
2003 static LIST_HEAD(pending_raid_disks
);
2006 * Try to register data integrity profile for an mddev
2008 * This is called when an array is started and after a disk has been kicked
2009 * from the array. It only succeeds if all working and active component devices
2010 * are integrity capable with matching profiles.
2012 int md_integrity_register(struct mddev
*mddev
)
2014 struct md_rdev
*rdev
, *reference
= NULL
;
2016 if (list_empty(&mddev
->disks
))
2017 return 0; /* nothing to do */
2018 if (!mddev
->gendisk
|| blk_get_integrity(mddev
->gendisk
))
2019 return 0; /* shouldn't register, or already is */
2020 rdev_for_each(rdev
, mddev
) {
2021 /* skip spares and non-functional disks */
2022 if (test_bit(Faulty
, &rdev
->flags
))
2024 if (rdev
->raid_disk
< 0)
2027 /* Use the first rdev as the reference */
2031 /* does this rdev's profile match the reference profile? */
2032 if (blk_integrity_compare(reference
->bdev
->bd_disk
,
2033 rdev
->bdev
->bd_disk
) < 0)
2036 if (!reference
|| !bdev_get_integrity(reference
->bdev
))
2039 * All component devices are integrity capable and have matching
2040 * profiles, register the common profile for the md device.
2042 blk_integrity_register(mddev
->gendisk
,
2043 bdev_get_integrity(reference
->bdev
));
2045 pr_debug("md: data integrity enabled on %s\n", mdname(mddev
));
2046 if (bioset_integrity_create(mddev
->bio_set
, BIO_POOL_SIZE
)) {
2047 pr_err("md: failed to create integrity pool for %s\n",
2053 EXPORT_SYMBOL(md_integrity_register
);
2056 * Attempt to add an rdev, but only if it is consistent with the current
2059 int md_integrity_add_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
2061 struct blk_integrity
*bi_rdev
;
2062 struct blk_integrity
*bi_mddev
;
2063 char name
[BDEVNAME_SIZE
];
2065 if (!mddev
->gendisk
)
2068 bi_rdev
= bdev_get_integrity(rdev
->bdev
);
2069 bi_mddev
= blk_get_integrity(mddev
->gendisk
);
2071 if (!bi_mddev
) /* nothing to do */
2074 if (blk_integrity_compare(mddev
->gendisk
, rdev
->bdev
->bd_disk
) != 0) {
2075 pr_err("%s: incompatible integrity profile for %s\n",
2076 mdname(mddev
), bdevname(rdev
->bdev
, name
));
2082 EXPORT_SYMBOL(md_integrity_add_rdev
);
2084 static int bind_rdev_to_array(struct md_rdev
*rdev
, struct mddev
*mddev
)
2086 char b
[BDEVNAME_SIZE
];
2090 /* prevent duplicates */
2091 if (find_rdev(mddev
, rdev
->bdev
->bd_dev
))
2094 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2095 if (!test_bit(Journal
, &rdev
->flags
) &&
2097 (mddev
->dev_sectors
== 0 || rdev
->sectors
< mddev
->dev_sectors
)) {
2099 /* Cannot change size, so fail
2100 * If mddev->level <= 0, then we don't care
2101 * about aligning sizes (e.g. linear)
2103 if (mddev
->level
> 0)
2106 mddev
->dev_sectors
= rdev
->sectors
;
2109 /* Verify rdev->desc_nr is unique.
2110 * If it is -1, assign a free number, else
2111 * check number is not in use
2114 if (rdev
->desc_nr
< 0) {
2117 choice
= mddev
->raid_disks
;
2118 while (md_find_rdev_nr_rcu(mddev
, choice
))
2120 rdev
->desc_nr
= choice
;
2122 if (md_find_rdev_nr_rcu(mddev
, rdev
->desc_nr
)) {
2128 if (!test_bit(Journal
, &rdev
->flags
) &&
2129 mddev
->max_disks
&& rdev
->desc_nr
>= mddev
->max_disks
) {
2130 pr_warn("md: %s: array is limited to %d devices\n",
2131 mdname(mddev
), mddev
->max_disks
);
2134 bdevname(rdev
->bdev
,b
);
2135 strreplace(b
, '/', '!');
2137 rdev
->mddev
= mddev
;
2138 pr_debug("md: bind<%s>\n", b
);
2140 if ((err
= kobject_add(&rdev
->kobj
, &mddev
->kobj
, "dev-%s", b
)))
2143 ko
= &part_to_dev(rdev
->bdev
->bd_part
)->kobj
;
2144 if (sysfs_create_link(&rdev
->kobj
, ko
, "block"))
2145 /* failure here is OK */;
2146 rdev
->sysfs_state
= sysfs_get_dirent_safe(rdev
->kobj
.sd
, "state");
2148 list_add_rcu(&rdev
->same_set
, &mddev
->disks
);
2149 bd_link_disk_holder(rdev
->bdev
, mddev
->gendisk
);
2151 /* May as well allow recovery to be retried once */
2152 mddev
->recovery_disabled
++;
2157 pr_warn("md: failed to register dev-%s for %s\n",
2162 static void md_delayed_delete(struct work_struct
*ws
)
2164 struct md_rdev
*rdev
= container_of(ws
, struct md_rdev
, del_work
);
2165 kobject_del(&rdev
->kobj
);
2166 kobject_put(&rdev
->kobj
);
2169 static void unbind_rdev_from_array(struct md_rdev
*rdev
)
2171 char b
[BDEVNAME_SIZE
];
2173 bd_unlink_disk_holder(rdev
->bdev
, rdev
->mddev
->gendisk
);
2174 list_del_rcu(&rdev
->same_set
);
2175 pr_debug("md: unbind<%s>\n", bdevname(rdev
->bdev
,b
));
2177 sysfs_remove_link(&rdev
->kobj
, "block");
2178 sysfs_put(rdev
->sysfs_state
);
2179 rdev
->sysfs_state
= NULL
;
2180 rdev
->badblocks
.count
= 0;
2181 /* We need to delay this, otherwise we can deadlock when
2182 * writing to 'remove' to "dev/state". We also need
2183 * to delay it due to rcu usage.
2186 INIT_WORK(&rdev
->del_work
, md_delayed_delete
);
2187 kobject_get(&rdev
->kobj
);
2188 queue_work(md_misc_wq
, &rdev
->del_work
);
2192 * prevent the device from being mounted, repartitioned or
2193 * otherwise reused by a RAID array (or any other kernel
2194 * subsystem), by bd_claiming the device.
2196 static int lock_rdev(struct md_rdev
*rdev
, dev_t dev
, int shared
)
2199 struct block_device
*bdev
;
2200 char b
[BDEVNAME_SIZE
];
2202 bdev
= blkdev_get_by_dev(dev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
,
2203 shared
? (struct md_rdev
*)lock_rdev
: rdev
);
2205 pr_warn("md: could not open %s.\n", __bdevname(dev
, b
));
2206 return PTR_ERR(bdev
);
2212 static void unlock_rdev(struct md_rdev
*rdev
)
2214 struct block_device
*bdev
= rdev
->bdev
;
2216 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
);
2219 void md_autodetect_dev(dev_t dev
);
2221 static void export_rdev(struct md_rdev
*rdev
)
2223 char b
[BDEVNAME_SIZE
];
2225 pr_debug("md: export_rdev(%s)\n", bdevname(rdev
->bdev
,b
));
2226 md_rdev_clear(rdev
);
2228 if (test_bit(AutoDetected
, &rdev
->flags
))
2229 md_autodetect_dev(rdev
->bdev
->bd_dev
);
2232 kobject_put(&rdev
->kobj
);
2235 void md_kick_rdev_from_array(struct md_rdev
*rdev
)
2237 unbind_rdev_from_array(rdev
);
2240 EXPORT_SYMBOL_GPL(md_kick_rdev_from_array
);
2242 static void export_array(struct mddev
*mddev
)
2244 struct md_rdev
*rdev
;
2246 while (!list_empty(&mddev
->disks
)) {
2247 rdev
= list_first_entry(&mddev
->disks
, struct md_rdev
,
2249 md_kick_rdev_from_array(rdev
);
2251 mddev
->raid_disks
= 0;
2252 mddev
->major_version
= 0;
2255 static bool set_in_sync(struct mddev
*mddev
)
2257 WARN_ON_ONCE(!spin_is_locked(&mddev
->lock
));
2258 if (atomic_read(&mddev
->writes_pending
) == 0) {
2259 if (mddev
->in_sync
== 0) {
2262 if (atomic_read(&mddev
->writes_pending
))
2263 /* lost a race with md_write_start() */
2265 set_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
2266 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
2269 if (mddev
->safemode
== 1)
2270 mddev
->safemode
= 0;
2271 return mddev
->in_sync
;
2274 static void sync_sbs(struct mddev
*mddev
, int nospares
)
2276 /* Update each superblock (in-memory image), but
2277 * if we are allowed to, skip spares which already
2278 * have the right event counter, or have one earlier
2279 * (which would mean they aren't being marked as dirty
2280 * with the rest of the array)
2282 struct md_rdev
*rdev
;
2283 rdev_for_each(rdev
, mddev
) {
2284 if (rdev
->sb_events
== mddev
->events
||
2286 rdev
->raid_disk
< 0 &&
2287 rdev
->sb_events
+1 == mddev
->events
)) {
2288 /* Don't update this superblock */
2289 rdev
->sb_loaded
= 2;
2291 sync_super(mddev
, rdev
);
2292 rdev
->sb_loaded
= 1;
2297 static bool does_sb_need_changing(struct mddev
*mddev
)
2299 struct md_rdev
*rdev
;
2300 struct mdp_superblock_1
*sb
;
2303 /* Find a good rdev */
2304 rdev_for_each(rdev
, mddev
)
2305 if ((rdev
->raid_disk
>= 0) && !test_bit(Faulty
, &rdev
->flags
))
2308 /* No good device found. */
2312 sb
= page_address(rdev
->sb_page
);
2313 /* Check if a device has become faulty or a spare become active */
2314 rdev_for_each(rdev
, mddev
) {
2315 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
2316 /* Device activated? */
2317 if (role
== 0xffff && rdev
->raid_disk
>=0 &&
2318 !test_bit(Faulty
, &rdev
->flags
))
2320 /* Device turned faulty? */
2321 if (test_bit(Faulty
, &rdev
->flags
) && (role
< 0xfffd))
2325 /* Check if any mddev parameters have changed */
2326 if ((mddev
->dev_sectors
!= le64_to_cpu(sb
->size
)) ||
2327 (mddev
->reshape_position
!= le64_to_cpu(sb
->reshape_position
)) ||
2328 (mddev
->layout
!= le32_to_cpu(sb
->layout
)) ||
2329 (mddev
->raid_disks
!= le32_to_cpu(sb
->raid_disks
)) ||
2330 (mddev
->chunk_sectors
!= le32_to_cpu(sb
->chunksize
)))
2336 void md_update_sb(struct mddev
*mddev
, int force_change
)
2338 struct md_rdev
*rdev
;
2341 int any_badblocks_changed
= 0;
2346 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
2351 if (mddev_is_clustered(mddev
)) {
2352 if (test_and_clear_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
))
2354 if (test_and_clear_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
))
2356 ret
= md_cluster_ops
->metadata_update_start(mddev
);
2357 /* Has someone else has updated the sb */
2358 if (!does_sb_need_changing(mddev
)) {
2360 md_cluster_ops
->metadata_update_cancel(mddev
);
2361 bit_clear_unless(&mddev
->sb_flags
, BIT(MD_SB_CHANGE_PENDING
),
2362 BIT(MD_SB_CHANGE_DEVS
) |
2363 BIT(MD_SB_CHANGE_CLEAN
));
2368 /* First make sure individual recovery_offsets are correct */
2369 rdev_for_each(rdev
, mddev
) {
2370 if (rdev
->raid_disk
>= 0 &&
2371 mddev
->delta_disks
>= 0 &&
2372 !test_bit(Journal
, &rdev
->flags
) &&
2373 !test_bit(In_sync
, &rdev
->flags
) &&
2374 mddev
->curr_resync_completed
> rdev
->recovery_offset
)
2375 rdev
->recovery_offset
= mddev
->curr_resync_completed
;
2378 if (!mddev
->persistent
) {
2379 clear_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
2380 clear_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
2381 if (!mddev
->external
) {
2382 clear_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
2383 rdev_for_each(rdev
, mddev
) {
2384 if (rdev
->badblocks
.changed
) {
2385 rdev
->badblocks
.changed
= 0;
2386 ack_all_badblocks(&rdev
->badblocks
);
2387 md_error(mddev
, rdev
);
2389 clear_bit(Blocked
, &rdev
->flags
);
2390 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2391 wake_up(&rdev
->blocked_wait
);
2394 wake_up(&mddev
->sb_wait
);
2398 spin_lock(&mddev
->lock
);
2400 mddev
->utime
= ktime_get_real_seconds();
2402 if (test_and_clear_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
))
2404 if (test_and_clear_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
))
2405 /* just a clean<-> dirty transition, possibly leave spares alone,
2406 * though if events isn't the right even/odd, we will have to do
2412 if (mddev
->degraded
)
2413 /* If the array is degraded, then skipping spares is both
2414 * dangerous and fairly pointless.
2415 * Dangerous because a device that was removed from the array
2416 * might have a event_count that still looks up-to-date,
2417 * so it can be re-added without a resync.
2418 * Pointless because if there are any spares to skip,
2419 * then a recovery will happen and soon that array won't
2420 * be degraded any more and the spare can go back to sleep then.
2424 sync_req
= mddev
->in_sync
;
2426 /* If this is just a dirty<->clean transition, and the array is clean
2427 * and 'events' is odd, we can roll back to the previous clean state */
2429 && (mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
2430 && mddev
->can_decrease_events
2431 && mddev
->events
!= 1) {
2433 mddev
->can_decrease_events
= 0;
2435 /* otherwise we have to go forward and ... */
2437 mddev
->can_decrease_events
= nospares
;
2441 * This 64-bit counter should never wrap.
2442 * Either we are in around ~1 trillion A.C., assuming
2443 * 1 reboot per second, or we have a bug...
2445 WARN_ON(mddev
->events
== 0);
2447 rdev_for_each(rdev
, mddev
) {
2448 if (rdev
->badblocks
.changed
)
2449 any_badblocks_changed
++;
2450 if (test_bit(Faulty
, &rdev
->flags
))
2451 set_bit(FaultRecorded
, &rdev
->flags
);
2454 sync_sbs(mddev
, nospares
);
2455 spin_unlock(&mddev
->lock
);
2457 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2458 mdname(mddev
), mddev
->in_sync
);
2461 blk_add_trace_msg(mddev
->queue
, "md md_update_sb");
2463 bitmap_update_sb(mddev
->bitmap
);
2464 rdev_for_each(rdev
, mddev
) {
2465 char b
[BDEVNAME_SIZE
];
2467 if (rdev
->sb_loaded
!= 1)
2468 continue; /* no noise on spare devices */
2470 if (!test_bit(Faulty
, &rdev
->flags
)) {
2471 md_super_write(mddev
,rdev
,
2472 rdev
->sb_start
, rdev
->sb_size
,
2474 pr_debug("md: (write) %s's sb offset: %llu\n",
2475 bdevname(rdev
->bdev
, b
),
2476 (unsigned long long)rdev
->sb_start
);
2477 rdev
->sb_events
= mddev
->events
;
2478 if (rdev
->badblocks
.size
) {
2479 md_super_write(mddev
, rdev
,
2480 rdev
->badblocks
.sector
,
2481 rdev
->badblocks
.size
<< 9,
2483 rdev
->badblocks
.size
= 0;
2487 pr_debug("md: %s (skipping faulty)\n",
2488 bdevname(rdev
->bdev
, b
));
2490 if (mddev
->level
== LEVEL_MULTIPATH
)
2491 /* only need to write one superblock... */
2494 if (md_super_wait(mddev
) < 0)
2496 /* if there was a failure, MD_SB_CHANGE_DEVS was set, and we re-write super */
2498 if (mddev_is_clustered(mddev
) && ret
== 0)
2499 md_cluster_ops
->metadata_update_finish(mddev
);
2501 if (mddev
->in_sync
!= sync_req
||
2502 !bit_clear_unless(&mddev
->sb_flags
, BIT(MD_SB_CHANGE_PENDING
),
2503 BIT(MD_SB_CHANGE_DEVS
) | BIT(MD_SB_CHANGE_CLEAN
)))
2504 /* have to write it out again */
2506 wake_up(&mddev
->sb_wait
);
2507 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
2508 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
2510 rdev_for_each(rdev
, mddev
) {
2511 if (test_and_clear_bit(FaultRecorded
, &rdev
->flags
))
2512 clear_bit(Blocked
, &rdev
->flags
);
2514 if (any_badblocks_changed
)
2515 ack_all_badblocks(&rdev
->badblocks
);
2516 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2517 wake_up(&rdev
->blocked_wait
);
2520 EXPORT_SYMBOL(md_update_sb
);
2522 static int add_bound_rdev(struct md_rdev
*rdev
)
2524 struct mddev
*mddev
= rdev
->mddev
;
2526 bool add_journal
= test_bit(Journal
, &rdev
->flags
);
2528 if (!mddev
->pers
->hot_remove_disk
|| add_journal
) {
2529 /* If there is hot_add_disk but no hot_remove_disk
2530 * then added disks for geometry changes,
2531 * and should be added immediately.
2533 super_types
[mddev
->major_version
].
2534 validate_super(mddev
, rdev
);
2536 mddev_suspend(mddev
);
2537 err
= mddev
->pers
->hot_add_disk(mddev
, rdev
);
2539 mddev_resume(mddev
);
2541 md_kick_rdev_from_array(rdev
);
2545 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2547 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
2548 if (mddev
->degraded
)
2549 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
2550 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
2551 md_new_event(mddev
);
2552 md_wakeup_thread(mddev
->thread
);
2556 /* words written to sysfs files may, or may not, be \n terminated.
2557 * We want to accept with case. For this we use cmd_match.
2559 static int cmd_match(const char *cmd
, const char *str
)
2561 /* See if cmd, written into a sysfs file, matches
2562 * str. They must either be the same, or cmd can
2563 * have a trailing newline
2565 while (*cmd
&& *str
&& *cmd
== *str
) {
2576 struct rdev_sysfs_entry
{
2577 struct attribute attr
;
2578 ssize_t (*show
)(struct md_rdev
*, char *);
2579 ssize_t (*store
)(struct md_rdev
*, const char *, size_t);
2583 state_show(struct md_rdev
*rdev
, char *page
)
2587 unsigned long flags
= ACCESS_ONCE(rdev
->flags
);
2589 if (test_bit(Faulty
, &flags
) ||
2590 (!test_bit(ExternalBbl
, &flags
) &&
2591 rdev
->badblocks
.unacked_exist
))
2592 len
+= sprintf(page
+len
, "faulty%s", sep
);
2593 if (test_bit(In_sync
, &flags
))
2594 len
+= sprintf(page
+len
, "in_sync%s", sep
);
2595 if (test_bit(Journal
, &flags
))
2596 len
+= sprintf(page
+len
, "journal%s", sep
);
2597 if (test_bit(WriteMostly
, &flags
))
2598 len
+= sprintf(page
+len
, "write_mostly%s", sep
);
2599 if (test_bit(Blocked
, &flags
) ||
2600 (rdev
->badblocks
.unacked_exist
2601 && !test_bit(Faulty
, &flags
)))
2602 len
+= sprintf(page
+len
, "blocked%s", sep
);
2603 if (!test_bit(Faulty
, &flags
) &&
2604 !test_bit(Journal
, &flags
) &&
2605 !test_bit(In_sync
, &flags
))
2606 len
+= sprintf(page
+len
, "spare%s", sep
);
2607 if (test_bit(WriteErrorSeen
, &flags
))
2608 len
+= sprintf(page
+len
, "write_error%s", sep
);
2609 if (test_bit(WantReplacement
, &flags
))
2610 len
+= sprintf(page
+len
, "want_replacement%s", sep
);
2611 if (test_bit(Replacement
, &flags
))
2612 len
+= sprintf(page
+len
, "replacement%s", sep
);
2613 if (test_bit(ExternalBbl
, &flags
))
2614 len
+= sprintf(page
+len
, "external_bbl%s", sep
);
2615 if (test_bit(FailFast
, &flags
))
2616 len
+= sprintf(page
+len
, "failfast%s", sep
);
2621 return len
+sprintf(page
+len
, "\n");
2625 state_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2628 * faulty - simulates an error
2629 * remove - disconnects the device
2630 * writemostly - sets write_mostly
2631 * -writemostly - clears write_mostly
2632 * blocked - sets the Blocked flags
2633 * -blocked - clears the Blocked and possibly simulates an error
2634 * insync - sets Insync providing device isn't active
2635 * -insync - clear Insync for a device with a slot assigned,
2636 * so that it gets rebuilt based on bitmap
2637 * write_error - sets WriteErrorSeen
2638 * -write_error - clears WriteErrorSeen
2639 * {,-}failfast - set/clear FailFast
2642 if (cmd_match(buf
, "faulty") && rdev
->mddev
->pers
) {
2643 md_error(rdev
->mddev
, rdev
);
2644 if (test_bit(Faulty
, &rdev
->flags
))
2648 } else if (cmd_match(buf
, "remove")) {
2649 if (rdev
->mddev
->pers
) {
2650 clear_bit(Blocked
, &rdev
->flags
);
2651 remove_and_add_spares(rdev
->mddev
, rdev
);
2653 if (rdev
->raid_disk
>= 0)
2656 struct mddev
*mddev
= rdev
->mddev
;
2658 if (mddev_is_clustered(mddev
))
2659 err
= md_cluster_ops
->remove_disk(mddev
, rdev
);
2662 md_kick_rdev_from_array(rdev
);
2664 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
2665 md_wakeup_thread(mddev
->thread
);
2667 md_new_event(mddev
);
2670 } else if (cmd_match(buf
, "writemostly")) {
2671 set_bit(WriteMostly
, &rdev
->flags
);
2673 } else if (cmd_match(buf
, "-writemostly")) {
2674 clear_bit(WriteMostly
, &rdev
->flags
);
2676 } else if (cmd_match(buf
, "blocked")) {
2677 set_bit(Blocked
, &rdev
->flags
);
2679 } else if (cmd_match(buf
, "-blocked")) {
2680 if (!test_bit(Faulty
, &rdev
->flags
) &&
2681 !test_bit(ExternalBbl
, &rdev
->flags
) &&
2682 rdev
->badblocks
.unacked_exist
) {
2683 /* metadata handler doesn't understand badblocks,
2684 * so we need to fail the device
2686 md_error(rdev
->mddev
, rdev
);
2688 clear_bit(Blocked
, &rdev
->flags
);
2689 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2690 wake_up(&rdev
->blocked_wait
);
2691 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2692 md_wakeup_thread(rdev
->mddev
->thread
);
2695 } else if (cmd_match(buf
, "insync") && rdev
->raid_disk
== -1) {
2696 set_bit(In_sync
, &rdev
->flags
);
2698 } else if (cmd_match(buf
, "failfast")) {
2699 set_bit(FailFast
, &rdev
->flags
);
2701 } else if (cmd_match(buf
, "-failfast")) {
2702 clear_bit(FailFast
, &rdev
->flags
);
2704 } else if (cmd_match(buf
, "-insync") && rdev
->raid_disk
>= 0 &&
2705 !test_bit(Journal
, &rdev
->flags
)) {
2706 if (rdev
->mddev
->pers
== NULL
) {
2707 clear_bit(In_sync
, &rdev
->flags
);
2708 rdev
->saved_raid_disk
= rdev
->raid_disk
;
2709 rdev
->raid_disk
= -1;
2712 } else if (cmd_match(buf
, "write_error")) {
2713 set_bit(WriteErrorSeen
, &rdev
->flags
);
2715 } else if (cmd_match(buf
, "-write_error")) {
2716 clear_bit(WriteErrorSeen
, &rdev
->flags
);
2718 } else if (cmd_match(buf
, "want_replacement")) {
2719 /* Any non-spare device that is not a replacement can
2720 * become want_replacement at any time, but we then need to
2721 * check if recovery is needed.
2723 if (rdev
->raid_disk
>= 0 &&
2724 !test_bit(Journal
, &rdev
->flags
) &&
2725 !test_bit(Replacement
, &rdev
->flags
))
2726 set_bit(WantReplacement
, &rdev
->flags
);
2727 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2728 md_wakeup_thread(rdev
->mddev
->thread
);
2730 } else if (cmd_match(buf
, "-want_replacement")) {
2731 /* Clearing 'want_replacement' is always allowed.
2732 * Once replacements starts it is too late though.
2735 clear_bit(WantReplacement
, &rdev
->flags
);
2736 } else if (cmd_match(buf
, "replacement")) {
2737 /* Can only set a device as a replacement when array has not
2738 * yet been started. Once running, replacement is automatic
2739 * from spares, or by assigning 'slot'.
2741 if (rdev
->mddev
->pers
)
2744 set_bit(Replacement
, &rdev
->flags
);
2747 } else if (cmd_match(buf
, "-replacement")) {
2748 /* Similarly, can only clear Replacement before start */
2749 if (rdev
->mddev
->pers
)
2752 clear_bit(Replacement
, &rdev
->flags
);
2755 } else if (cmd_match(buf
, "re-add")) {
2756 if (test_bit(Faulty
, &rdev
->flags
) && (rdev
->raid_disk
== -1)) {
2757 /* clear_bit is performed _after_ all the devices
2758 * have their local Faulty bit cleared. If any writes
2759 * happen in the meantime in the local node, they
2760 * will land in the local bitmap, which will be synced
2761 * by this node eventually
2763 if (!mddev_is_clustered(rdev
->mddev
) ||
2764 (err
= md_cluster_ops
->gather_bitmaps(rdev
)) == 0) {
2765 clear_bit(Faulty
, &rdev
->flags
);
2766 err
= add_bound_rdev(rdev
);
2770 } else if (cmd_match(buf
, "external_bbl") && (rdev
->mddev
->external
)) {
2771 set_bit(ExternalBbl
, &rdev
->flags
);
2772 rdev
->badblocks
.shift
= 0;
2774 } else if (cmd_match(buf
, "-external_bbl") && (rdev
->mddev
->external
)) {
2775 clear_bit(ExternalBbl
, &rdev
->flags
);
2779 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2780 return err
? err
: len
;
2782 static struct rdev_sysfs_entry rdev_state
=
2783 __ATTR_PREALLOC(state
, S_IRUGO
|S_IWUSR
, state_show
, state_store
);
2786 errors_show(struct md_rdev
*rdev
, char *page
)
2788 return sprintf(page
, "%d\n", atomic_read(&rdev
->corrected_errors
));
2792 errors_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2797 rv
= kstrtouint(buf
, 10, &n
);
2800 atomic_set(&rdev
->corrected_errors
, n
);
2803 static struct rdev_sysfs_entry rdev_errors
=
2804 __ATTR(errors
, S_IRUGO
|S_IWUSR
, errors_show
, errors_store
);
2807 slot_show(struct md_rdev
*rdev
, char *page
)
2809 if (test_bit(Journal
, &rdev
->flags
))
2810 return sprintf(page
, "journal\n");
2811 else if (rdev
->raid_disk
< 0)
2812 return sprintf(page
, "none\n");
2814 return sprintf(page
, "%d\n", rdev
->raid_disk
);
2818 slot_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2823 if (test_bit(Journal
, &rdev
->flags
))
2825 if (strncmp(buf
, "none", 4)==0)
2828 err
= kstrtouint(buf
, 10, (unsigned int *)&slot
);
2832 if (rdev
->mddev
->pers
&& slot
== -1) {
2833 /* Setting 'slot' on an active array requires also
2834 * updating the 'rd%d' link, and communicating
2835 * with the personality with ->hot_*_disk.
2836 * For now we only support removing
2837 * failed/spare devices. This normally happens automatically,
2838 * but not when the metadata is externally managed.
2840 if (rdev
->raid_disk
== -1)
2842 /* personality does all needed checks */
2843 if (rdev
->mddev
->pers
->hot_remove_disk
== NULL
)
2845 clear_bit(Blocked
, &rdev
->flags
);
2846 remove_and_add_spares(rdev
->mddev
, rdev
);
2847 if (rdev
->raid_disk
>= 0)
2849 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2850 md_wakeup_thread(rdev
->mddev
->thread
);
2851 } else if (rdev
->mddev
->pers
) {
2852 /* Activating a spare .. or possibly reactivating
2853 * if we ever get bitmaps working here.
2857 if (rdev
->raid_disk
!= -1)
2860 if (test_bit(MD_RECOVERY_RUNNING
, &rdev
->mddev
->recovery
))
2863 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
2866 if (slot
>= rdev
->mddev
->raid_disks
&&
2867 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
2870 rdev
->raid_disk
= slot
;
2871 if (test_bit(In_sync
, &rdev
->flags
))
2872 rdev
->saved_raid_disk
= slot
;
2874 rdev
->saved_raid_disk
= -1;
2875 clear_bit(In_sync
, &rdev
->flags
);
2876 clear_bit(Bitmap_sync
, &rdev
->flags
);
2877 err
= rdev
->mddev
->pers
->
2878 hot_add_disk(rdev
->mddev
, rdev
);
2880 rdev
->raid_disk
= -1;
2883 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2884 if (sysfs_link_rdev(rdev
->mddev
, rdev
))
2885 /* failure here is OK */;
2886 /* don't wakeup anyone, leave that to userspace. */
2888 if (slot
>= rdev
->mddev
->raid_disks
&&
2889 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
2891 rdev
->raid_disk
= slot
;
2892 /* assume it is working */
2893 clear_bit(Faulty
, &rdev
->flags
);
2894 clear_bit(WriteMostly
, &rdev
->flags
);
2895 set_bit(In_sync
, &rdev
->flags
);
2896 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2901 static struct rdev_sysfs_entry rdev_slot
=
2902 __ATTR(slot
, S_IRUGO
|S_IWUSR
, slot_show
, slot_store
);
2905 offset_show(struct md_rdev
*rdev
, char *page
)
2907 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->data_offset
);
2911 offset_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2913 unsigned long long offset
;
2914 if (kstrtoull(buf
, 10, &offset
) < 0)
2916 if (rdev
->mddev
->pers
&& rdev
->raid_disk
>= 0)
2918 if (rdev
->sectors
&& rdev
->mddev
->external
)
2919 /* Must set offset before size, so overlap checks
2922 rdev
->data_offset
= offset
;
2923 rdev
->new_data_offset
= offset
;
2927 static struct rdev_sysfs_entry rdev_offset
=
2928 __ATTR(offset
, S_IRUGO
|S_IWUSR
, offset_show
, offset_store
);
2930 static ssize_t
new_offset_show(struct md_rdev
*rdev
, char *page
)
2932 return sprintf(page
, "%llu\n",
2933 (unsigned long long)rdev
->new_data_offset
);
2936 static ssize_t
new_offset_store(struct md_rdev
*rdev
,
2937 const char *buf
, size_t len
)
2939 unsigned long long new_offset
;
2940 struct mddev
*mddev
= rdev
->mddev
;
2942 if (kstrtoull(buf
, 10, &new_offset
) < 0)
2945 if (mddev
->sync_thread
||
2946 test_bit(MD_RECOVERY_RUNNING
,&mddev
->recovery
))
2948 if (new_offset
== rdev
->data_offset
)
2949 /* reset is always permitted */
2951 else if (new_offset
> rdev
->data_offset
) {
2952 /* must not push array size beyond rdev_sectors */
2953 if (new_offset
- rdev
->data_offset
2954 + mddev
->dev_sectors
> rdev
->sectors
)
2957 /* Metadata worries about other space details. */
2959 /* decreasing the offset is inconsistent with a backwards
2962 if (new_offset
< rdev
->data_offset
&&
2963 mddev
->reshape_backwards
)
2965 /* Increasing offset is inconsistent with forwards
2966 * reshape. reshape_direction should be set to
2967 * 'backwards' first.
2969 if (new_offset
> rdev
->data_offset
&&
2970 !mddev
->reshape_backwards
)
2973 if (mddev
->pers
&& mddev
->persistent
&&
2974 !super_types
[mddev
->major_version
]
2975 .allow_new_offset(rdev
, new_offset
))
2977 rdev
->new_data_offset
= new_offset
;
2978 if (new_offset
> rdev
->data_offset
)
2979 mddev
->reshape_backwards
= 1;
2980 else if (new_offset
< rdev
->data_offset
)
2981 mddev
->reshape_backwards
= 0;
2985 static struct rdev_sysfs_entry rdev_new_offset
=
2986 __ATTR(new_offset
, S_IRUGO
|S_IWUSR
, new_offset_show
, new_offset_store
);
2989 rdev_size_show(struct md_rdev
*rdev
, char *page
)
2991 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->sectors
/ 2);
2994 static int overlaps(sector_t s1
, sector_t l1
, sector_t s2
, sector_t l2
)
2996 /* check if two start/length pairs overlap */
3004 static int strict_blocks_to_sectors(const char *buf
, sector_t
*sectors
)
3006 unsigned long long blocks
;
3009 if (kstrtoull(buf
, 10, &blocks
) < 0)
3012 if (blocks
& 1ULL << (8 * sizeof(blocks
) - 1))
3013 return -EINVAL
; /* sector conversion overflow */
3016 if (new != blocks
* 2)
3017 return -EINVAL
; /* unsigned long long to sector_t overflow */
3024 rdev_size_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3026 struct mddev
*my_mddev
= rdev
->mddev
;
3027 sector_t oldsectors
= rdev
->sectors
;
3030 if (test_bit(Journal
, &rdev
->flags
))
3032 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
3034 if (rdev
->data_offset
!= rdev
->new_data_offset
)
3035 return -EINVAL
; /* too confusing */
3036 if (my_mddev
->pers
&& rdev
->raid_disk
>= 0) {
3037 if (my_mddev
->persistent
) {
3038 sectors
= super_types
[my_mddev
->major_version
].
3039 rdev_size_change(rdev
, sectors
);
3042 } else if (!sectors
)
3043 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) -
3045 if (!my_mddev
->pers
->resize
)
3046 /* Cannot change size for RAID0 or Linear etc */
3049 if (sectors
< my_mddev
->dev_sectors
)
3050 return -EINVAL
; /* component must fit device */
3052 rdev
->sectors
= sectors
;
3053 if (sectors
> oldsectors
&& my_mddev
->external
) {
3054 /* Need to check that all other rdevs with the same
3055 * ->bdev do not overlap. 'rcu' is sufficient to walk
3056 * the rdev lists safely.
3057 * This check does not provide a hard guarantee, it
3058 * just helps avoid dangerous mistakes.
3060 struct mddev
*mddev
;
3062 struct list_head
*tmp
;
3065 for_each_mddev(mddev
, tmp
) {
3066 struct md_rdev
*rdev2
;
3068 rdev_for_each(rdev2
, mddev
)
3069 if (rdev
->bdev
== rdev2
->bdev
&&
3071 overlaps(rdev
->data_offset
, rdev
->sectors
,
3084 /* Someone else could have slipped in a size
3085 * change here, but doing so is just silly.
3086 * We put oldsectors back because we *know* it is
3087 * safe, and trust userspace not to race with
3090 rdev
->sectors
= oldsectors
;
3097 static struct rdev_sysfs_entry rdev_size
=
3098 __ATTR(size
, S_IRUGO
|S_IWUSR
, rdev_size_show
, rdev_size_store
);
3100 static ssize_t
recovery_start_show(struct md_rdev
*rdev
, char *page
)
3102 unsigned long long recovery_start
= rdev
->recovery_offset
;
3104 if (test_bit(In_sync
, &rdev
->flags
) ||
3105 recovery_start
== MaxSector
)
3106 return sprintf(page
, "none\n");
3108 return sprintf(page
, "%llu\n", recovery_start
);
3111 static ssize_t
recovery_start_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3113 unsigned long long recovery_start
;
3115 if (cmd_match(buf
, "none"))
3116 recovery_start
= MaxSector
;
3117 else if (kstrtoull(buf
, 10, &recovery_start
))
3120 if (rdev
->mddev
->pers
&&
3121 rdev
->raid_disk
>= 0)
3124 rdev
->recovery_offset
= recovery_start
;
3125 if (recovery_start
== MaxSector
)
3126 set_bit(In_sync
, &rdev
->flags
);
3128 clear_bit(In_sync
, &rdev
->flags
);
3132 static struct rdev_sysfs_entry rdev_recovery_start
=
3133 __ATTR(recovery_start
, S_IRUGO
|S_IWUSR
, recovery_start_show
, recovery_start_store
);
3135 /* sysfs access to bad-blocks list.
3136 * We present two files.
3137 * 'bad-blocks' lists sector numbers and lengths of ranges that
3138 * are recorded as bad. The list is truncated to fit within
3139 * the one-page limit of sysfs.
3140 * Writing "sector length" to this file adds an acknowledged
3142 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
3143 * been acknowledged. Writing to this file adds bad blocks
3144 * without acknowledging them. This is largely for testing.
3146 static ssize_t
bb_show(struct md_rdev
*rdev
, char *page
)
3148 return badblocks_show(&rdev
->badblocks
, page
, 0);
3150 static ssize_t
bb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
3152 int rv
= badblocks_store(&rdev
->badblocks
, page
, len
, 0);
3153 /* Maybe that ack was all we needed */
3154 if (test_and_clear_bit(BlockedBadBlocks
, &rdev
->flags
))
3155 wake_up(&rdev
->blocked_wait
);
3158 static struct rdev_sysfs_entry rdev_bad_blocks
=
3159 __ATTR(bad_blocks
, S_IRUGO
|S_IWUSR
, bb_show
, bb_store
);
3161 static ssize_t
ubb_show(struct md_rdev
*rdev
, char *page
)
3163 return badblocks_show(&rdev
->badblocks
, page
, 1);
3165 static ssize_t
ubb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
3167 return badblocks_store(&rdev
->badblocks
, page
, len
, 1);
3169 static struct rdev_sysfs_entry rdev_unack_bad_blocks
=
3170 __ATTR(unacknowledged_bad_blocks
, S_IRUGO
|S_IWUSR
, ubb_show
, ubb_store
);
3173 ppl_sector_show(struct md_rdev
*rdev
, char *page
)
3175 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->ppl
.sector
);
3179 ppl_sector_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3181 unsigned long long sector
;
3183 if (kstrtoull(buf
, 10, §or
) < 0)
3185 if (sector
!= (sector_t
)sector
)
3188 if (rdev
->mddev
->pers
&& test_bit(MD_HAS_PPL
, &rdev
->mddev
->flags
) &&
3189 rdev
->raid_disk
>= 0)
3192 if (rdev
->mddev
->persistent
) {
3193 if (rdev
->mddev
->major_version
== 0)
3195 if ((sector
> rdev
->sb_start
&&
3196 sector
- rdev
->sb_start
> S16_MAX
) ||
3197 (sector
< rdev
->sb_start
&&
3198 rdev
->sb_start
- sector
> -S16_MIN
))
3200 rdev
->ppl
.offset
= sector
- rdev
->sb_start
;
3201 } else if (!rdev
->mddev
->external
) {
3204 rdev
->ppl
.sector
= sector
;
3208 static struct rdev_sysfs_entry rdev_ppl_sector
=
3209 __ATTR(ppl_sector
, S_IRUGO
|S_IWUSR
, ppl_sector_show
, ppl_sector_store
);
3212 ppl_size_show(struct md_rdev
*rdev
, char *page
)
3214 return sprintf(page
, "%u\n", rdev
->ppl
.size
);
3218 ppl_size_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3222 if (kstrtouint(buf
, 10, &size
) < 0)
3225 if (rdev
->mddev
->pers
&& test_bit(MD_HAS_PPL
, &rdev
->mddev
->flags
) &&
3226 rdev
->raid_disk
>= 0)
3229 if (rdev
->mddev
->persistent
) {
3230 if (rdev
->mddev
->major_version
== 0)
3234 } else if (!rdev
->mddev
->external
) {
3237 rdev
->ppl
.size
= size
;
3241 static struct rdev_sysfs_entry rdev_ppl_size
=
3242 __ATTR(ppl_size
, S_IRUGO
|S_IWUSR
, ppl_size_show
, ppl_size_store
);
3244 static struct attribute
*rdev_default_attrs
[] = {
3249 &rdev_new_offset
.attr
,
3251 &rdev_recovery_start
.attr
,
3252 &rdev_bad_blocks
.attr
,
3253 &rdev_unack_bad_blocks
.attr
,
3254 &rdev_ppl_sector
.attr
,
3255 &rdev_ppl_size
.attr
,
3259 rdev_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
3261 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
3262 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
3268 return entry
->show(rdev
, page
);
3272 rdev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
3273 const char *page
, size_t length
)
3275 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
3276 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
3278 struct mddev
*mddev
= rdev
->mddev
;
3282 if (!capable(CAP_SYS_ADMIN
))
3284 rv
= mddev
? mddev_lock(mddev
): -EBUSY
;
3286 if (rdev
->mddev
== NULL
)
3289 rv
= entry
->store(rdev
, page
, length
);
3290 mddev_unlock(mddev
);
3295 static void rdev_free(struct kobject
*ko
)
3297 struct md_rdev
*rdev
= container_of(ko
, struct md_rdev
, kobj
);
3300 static const struct sysfs_ops rdev_sysfs_ops
= {
3301 .show
= rdev_attr_show
,
3302 .store
= rdev_attr_store
,
3304 static struct kobj_type rdev_ktype
= {
3305 .release
= rdev_free
,
3306 .sysfs_ops
= &rdev_sysfs_ops
,
3307 .default_attrs
= rdev_default_attrs
,
3310 int md_rdev_init(struct md_rdev
*rdev
)
3313 rdev
->saved_raid_disk
= -1;
3314 rdev
->raid_disk
= -1;
3316 rdev
->data_offset
= 0;
3317 rdev
->new_data_offset
= 0;
3318 rdev
->sb_events
= 0;
3319 rdev
->last_read_error
= 0;
3320 rdev
->sb_loaded
= 0;
3321 rdev
->bb_page
= NULL
;
3322 atomic_set(&rdev
->nr_pending
, 0);
3323 atomic_set(&rdev
->read_errors
, 0);
3324 atomic_set(&rdev
->corrected_errors
, 0);
3326 INIT_LIST_HEAD(&rdev
->same_set
);
3327 init_waitqueue_head(&rdev
->blocked_wait
);
3329 /* Add space to store bad block list.
3330 * This reserves the space even on arrays where it cannot
3331 * be used - I wonder if that matters
3333 return badblocks_init(&rdev
->badblocks
, 0);
3335 EXPORT_SYMBOL_GPL(md_rdev_init
);
3337 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3339 * mark the device faulty if:
3341 * - the device is nonexistent (zero size)
3342 * - the device has no valid superblock
3344 * a faulty rdev _never_ has rdev->sb set.
3346 static struct md_rdev
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
3348 char b
[BDEVNAME_SIZE
];
3350 struct md_rdev
*rdev
;
3353 rdev
= kzalloc(sizeof(*rdev
), GFP_KERNEL
);
3355 return ERR_PTR(-ENOMEM
);
3357 err
= md_rdev_init(rdev
);
3360 err
= alloc_disk_sb(rdev
);
3364 err
= lock_rdev(rdev
, newdev
, super_format
== -2);
3368 kobject_init(&rdev
->kobj
, &rdev_ktype
);
3370 size
= i_size_read(rdev
->bdev
->bd_inode
) >> BLOCK_SIZE_BITS
;
3372 pr_warn("md: %s has zero or unknown size, marking faulty!\n",
3373 bdevname(rdev
->bdev
,b
));
3378 if (super_format
>= 0) {
3379 err
= super_types
[super_format
].
3380 load_super(rdev
, NULL
, super_minor
);
3381 if (err
== -EINVAL
) {
3382 pr_warn("md: %s does not have a valid v%d.%d superblock, not importing!\n",
3383 bdevname(rdev
->bdev
,b
),
3384 super_format
, super_minor
);
3388 pr_warn("md: could not read %s's sb, not importing!\n",
3389 bdevname(rdev
->bdev
,b
));
3399 md_rdev_clear(rdev
);
3401 return ERR_PTR(err
);
3405 * Check a full RAID array for plausibility
3408 static void analyze_sbs(struct mddev
*mddev
)
3411 struct md_rdev
*rdev
, *freshest
, *tmp
;
3412 char b
[BDEVNAME_SIZE
];
3415 rdev_for_each_safe(rdev
, tmp
, mddev
)
3416 switch (super_types
[mddev
->major_version
].
3417 load_super(rdev
, freshest
, mddev
->minor_version
)) {
3424 pr_warn("md: fatal superblock inconsistency in %s -- removing from array\n",
3425 bdevname(rdev
->bdev
,b
));
3426 md_kick_rdev_from_array(rdev
);
3429 super_types
[mddev
->major_version
].
3430 validate_super(mddev
, freshest
);
3433 rdev_for_each_safe(rdev
, tmp
, mddev
) {
3434 if (mddev
->max_disks
&&
3435 (rdev
->desc_nr
>= mddev
->max_disks
||
3436 i
> mddev
->max_disks
)) {
3437 pr_warn("md: %s: %s: only %d devices permitted\n",
3438 mdname(mddev
), bdevname(rdev
->bdev
, b
),
3440 md_kick_rdev_from_array(rdev
);
3443 if (rdev
!= freshest
) {
3444 if (super_types
[mddev
->major_version
].
3445 validate_super(mddev
, rdev
)) {
3446 pr_warn("md: kicking non-fresh %s from array!\n",
3447 bdevname(rdev
->bdev
,b
));
3448 md_kick_rdev_from_array(rdev
);
3452 if (mddev
->level
== LEVEL_MULTIPATH
) {
3453 rdev
->desc_nr
= i
++;
3454 rdev
->raid_disk
= rdev
->desc_nr
;
3455 set_bit(In_sync
, &rdev
->flags
);
3456 } else if (rdev
->raid_disk
>=
3457 (mddev
->raid_disks
- min(0, mddev
->delta_disks
)) &&
3458 !test_bit(Journal
, &rdev
->flags
)) {
3459 rdev
->raid_disk
= -1;
3460 clear_bit(In_sync
, &rdev
->flags
);
3465 /* Read a fixed-point number.
3466 * Numbers in sysfs attributes should be in "standard" units where
3467 * possible, so time should be in seconds.
3468 * However we internally use a a much smaller unit such as
3469 * milliseconds or jiffies.
3470 * This function takes a decimal number with a possible fractional
3471 * component, and produces an integer which is the result of
3472 * multiplying that number by 10^'scale'.
3473 * all without any floating-point arithmetic.
3475 int strict_strtoul_scaled(const char *cp
, unsigned long *res
, int scale
)
3477 unsigned long result
= 0;
3479 while (isdigit(*cp
) || (*cp
== '.' && decimals
< 0)) {
3482 else if (decimals
< scale
) {
3485 result
= result
* 10 + value
;
3497 while (decimals
< scale
) {
3506 safe_delay_show(struct mddev
*mddev
, char *page
)
3508 int msec
= (mddev
->safemode_delay
*1000)/HZ
;
3509 return sprintf(page
, "%d.%03d\n", msec
/1000, msec
%1000);
3512 safe_delay_store(struct mddev
*mddev
, const char *cbuf
, size_t len
)
3516 if (mddev_is_clustered(mddev
)) {
3517 pr_warn("md: Safemode is disabled for clustered mode\n");
3521 if (strict_strtoul_scaled(cbuf
, &msec
, 3) < 0)
3524 mddev
->safemode_delay
= 0;
3526 unsigned long old_delay
= mddev
->safemode_delay
;
3527 unsigned long new_delay
= (msec
*HZ
)/1000;
3531 mddev
->safemode_delay
= new_delay
;
3532 if (new_delay
< old_delay
|| old_delay
== 0)
3533 mod_timer(&mddev
->safemode_timer
, jiffies
+1);
3537 static struct md_sysfs_entry md_safe_delay
=
3538 __ATTR(safe_mode_delay
, S_IRUGO
|S_IWUSR
,safe_delay_show
, safe_delay_store
);
3541 level_show(struct mddev
*mddev
, char *page
)
3543 struct md_personality
*p
;
3545 spin_lock(&mddev
->lock
);
3548 ret
= sprintf(page
, "%s\n", p
->name
);
3549 else if (mddev
->clevel
[0])
3550 ret
= sprintf(page
, "%s\n", mddev
->clevel
);
3551 else if (mddev
->level
!= LEVEL_NONE
)
3552 ret
= sprintf(page
, "%d\n", mddev
->level
);
3555 spin_unlock(&mddev
->lock
);
3560 level_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3565 struct md_personality
*pers
, *oldpers
;
3567 void *priv
, *oldpriv
;
3568 struct md_rdev
*rdev
;
3570 if (slen
== 0 || slen
>= sizeof(clevel
))
3573 rv
= mddev_lock(mddev
);
3577 if (mddev
->pers
== NULL
) {
3578 strncpy(mddev
->clevel
, buf
, slen
);
3579 if (mddev
->clevel
[slen
-1] == '\n')
3581 mddev
->clevel
[slen
] = 0;
3582 mddev
->level
= LEVEL_NONE
;
3590 /* request to change the personality. Need to ensure:
3591 * - array is not engaged in resync/recovery/reshape
3592 * - old personality can be suspended
3593 * - new personality will access other array.
3597 if (mddev
->sync_thread
||
3598 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
3599 mddev
->reshape_position
!= MaxSector
||
3600 mddev
->sysfs_active
)
3604 if (!mddev
->pers
->quiesce
) {
3605 pr_warn("md: %s: %s does not support online personality change\n",
3606 mdname(mddev
), mddev
->pers
->name
);
3610 /* Now find the new personality */
3611 strncpy(clevel
, buf
, slen
);
3612 if (clevel
[slen
-1] == '\n')
3615 if (kstrtol(clevel
, 10, &level
))
3618 if (request_module("md-%s", clevel
) != 0)
3619 request_module("md-level-%s", clevel
);
3620 spin_lock(&pers_lock
);
3621 pers
= find_pers(level
, clevel
);
3622 if (!pers
|| !try_module_get(pers
->owner
)) {
3623 spin_unlock(&pers_lock
);
3624 pr_warn("md: personality %s not loaded\n", clevel
);
3628 spin_unlock(&pers_lock
);
3630 if (pers
== mddev
->pers
) {
3631 /* Nothing to do! */
3632 module_put(pers
->owner
);
3636 if (!pers
->takeover
) {
3637 module_put(pers
->owner
);
3638 pr_warn("md: %s: %s does not support personality takeover\n",
3639 mdname(mddev
), clevel
);
3644 rdev_for_each(rdev
, mddev
)
3645 rdev
->new_raid_disk
= rdev
->raid_disk
;
3647 /* ->takeover must set new_* and/or delta_disks
3648 * if it succeeds, and may set them when it fails.
3650 priv
= pers
->takeover(mddev
);
3652 mddev
->new_level
= mddev
->level
;
3653 mddev
->new_layout
= mddev
->layout
;
3654 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3655 mddev
->raid_disks
-= mddev
->delta_disks
;
3656 mddev
->delta_disks
= 0;
3657 mddev
->reshape_backwards
= 0;
3658 module_put(pers
->owner
);
3659 pr_warn("md: %s: %s would not accept array\n",
3660 mdname(mddev
), clevel
);
3665 /* Looks like we have a winner */
3666 mddev_suspend(mddev
);
3667 mddev_detach(mddev
);
3669 spin_lock(&mddev
->lock
);
3670 oldpers
= mddev
->pers
;
3671 oldpriv
= mddev
->private;
3673 mddev
->private = priv
;
3674 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
3675 mddev
->level
= mddev
->new_level
;
3676 mddev
->layout
= mddev
->new_layout
;
3677 mddev
->chunk_sectors
= mddev
->new_chunk_sectors
;
3678 mddev
->delta_disks
= 0;
3679 mddev
->reshape_backwards
= 0;
3680 mddev
->degraded
= 0;
3681 spin_unlock(&mddev
->lock
);
3683 if (oldpers
->sync_request
== NULL
&&
3685 /* We are converting from a no-redundancy array
3686 * to a redundancy array and metadata is managed
3687 * externally so we need to be sure that writes
3688 * won't block due to a need to transition
3690 * until external management is started.
3693 mddev
->safemode_delay
= 0;
3694 mddev
->safemode
= 0;
3697 oldpers
->free(mddev
, oldpriv
);
3699 if (oldpers
->sync_request
== NULL
&&
3700 pers
->sync_request
!= NULL
) {
3701 /* need to add the md_redundancy_group */
3702 if (sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
3703 pr_warn("md: cannot register extra attributes for %s\n",
3705 mddev
->sysfs_action
= sysfs_get_dirent(mddev
->kobj
.sd
, "sync_action");
3707 if (oldpers
->sync_request
!= NULL
&&
3708 pers
->sync_request
== NULL
) {
3709 /* need to remove the md_redundancy_group */
3710 if (mddev
->to_remove
== NULL
)
3711 mddev
->to_remove
= &md_redundancy_group
;
3714 module_put(oldpers
->owner
);
3716 rdev_for_each(rdev
, mddev
) {
3717 if (rdev
->raid_disk
< 0)
3719 if (rdev
->new_raid_disk
>= mddev
->raid_disks
)
3720 rdev
->new_raid_disk
= -1;
3721 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3723 sysfs_unlink_rdev(mddev
, rdev
);
3725 rdev_for_each(rdev
, mddev
) {
3726 if (rdev
->raid_disk
< 0)
3728 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3730 rdev
->raid_disk
= rdev
->new_raid_disk
;
3731 if (rdev
->raid_disk
< 0)
3732 clear_bit(In_sync
, &rdev
->flags
);
3734 if (sysfs_link_rdev(mddev
, rdev
))
3735 pr_warn("md: cannot register rd%d for %s after level change\n",
3736 rdev
->raid_disk
, mdname(mddev
));
3740 if (pers
->sync_request
== NULL
) {
3741 /* this is now an array without redundancy, so
3742 * it must always be in_sync
3745 del_timer_sync(&mddev
->safemode_timer
);
3747 blk_set_stacking_limits(&mddev
->queue
->limits
);
3749 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
3750 mddev_resume(mddev
);
3752 md_update_sb(mddev
, 1);
3753 sysfs_notify(&mddev
->kobj
, NULL
, "level");
3754 md_new_event(mddev
);
3757 mddev_unlock(mddev
);
3761 static struct md_sysfs_entry md_level
=
3762 __ATTR(level
, S_IRUGO
|S_IWUSR
, level_show
, level_store
);
3765 layout_show(struct mddev
*mddev
, char *page
)
3767 /* just a number, not meaningful for all levels */
3768 if (mddev
->reshape_position
!= MaxSector
&&
3769 mddev
->layout
!= mddev
->new_layout
)
3770 return sprintf(page
, "%d (%d)\n",
3771 mddev
->new_layout
, mddev
->layout
);
3772 return sprintf(page
, "%d\n", mddev
->layout
);
3776 layout_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3781 err
= kstrtouint(buf
, 10, &n
);
3784 err
= mddev_lock(mddev
);
3789 if (mddev
->pers
->check_reshape
== NULL
)
3794 mddev
->new_layout
= n
;
3795 err
= mddev
->pers
->check_reshape(mddev
);
3797 mddev
->new_layout
= mddev
->layout
;
3800 mddev
->new_layout
= n
;
3801 if (mddev
->reshape_position
== MaxSector
)
3804 mddev_unlock(mddev
);
3807 static struct md_sysfs_entry md_layout
=
3808 __ATTR(layout
, S_IRUGO
|S_IWUSR
, layout_show
, layout_store
);
3811 raid_disks_show(struct mddev
*mddev
, char *page
)
3813 if (mddev
->raid_disks
== 0)
3815 if (mddev
->reshape_position
!= MaxSector
&&
3816 mddev
->delta_disks
!= 0)
3817 return sprintf(page
, "%d (%d)\n", mddev
->raid_disks
,
3818 mddev
->raid_disks
- mddev
->delta_disks
);
3819 return sprintf(page
, "%d\n", mddev
->raid_disks
);
3822 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
);
3825 raid_disks_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3830 err
= kstrtouint(buf
, 10, &n
);
3834 err
= mddev_lock(mddev
);
3838 err
= update_raid_disks(mddev
, n
);
3839 else if (mddev
->reshape_position
!= MaxSector
) {
3840 struct md_rdev
*rdev
;
3841 int olddisks
= mddev
->raid_disks
- mddev
->delta_disks
;
3844 rdev_for_each(rdev
, mddev
) {
3846 rdev
->data_offset
< rdev
->new_data_offset
)
3849 rdev
->data_offset
> rdev
->new_data_offset
)
3853 mddev
->delta_disks
= n
- olddisks
;
3854 mddev
->raid_disks
= n
;
3855 mddev
->reshape_backwards
= (mddev
->delta_disks
< 0);
3857 mddev
->raid_disks
= n
;
3859 mddev_unlock(mddev
);
3860 return err
? err
: len
;
3862 static struct md_sysfs_entry md_raid_disks
=
3863 __ATTR(raid_disks
, S_IRUGO
|S_IWUSR
, raid_disks_show
, raid_disks_store
);
3866 chunk_size_show(struct mddev
*mddev
, char *page
)
3868 if (mddev
->reshape_position
!= MaxSector
&&
3869 mddev
->chunk_sectors
!= mddev
->new_chunk_sectors
)
3870 return sprintf(page
, "%d (%d)\n",
3871 mddev
->new_chunk_sectors
<< 9,
3872 mddev
->chunk_sectors
<< 9);
3873 return sprintf(page
, "%d\n", mddev
->chunk_sectors
<< 9);
3877 chunk_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3882 err
= kstrtoul(buf
, 10, &n
);
3886 err
= mddev_lock(mddev
);
3890 if (mddev
->pers
->check_reshape
== NULL
)
3895 mddev
->new_chunk_sectors
= n
>> 9;
3896 err
= mddev
->pers
->check_reshape(mddev
);
3898 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3901 mddev
->new_chunk_sectors
= n
>> 9;
3902 if (mddev
->reshape_position
== MaxSector
)
3903 mddev
->chunk_sectors
= n
>> 9;
3905 mddev_unlock(mddev
);
3908 static struct md_sysfs_entry md_chunk_size
=
3909 __ATTR(chunk_size
, S_IRUGO
|S_IWUSR
, chunk_size_show
, chunk_size_store
);
3912 resync_start_show(struct mddev
*mddev
, char *page
)
3914 if (mddev
->recovery_cp
== MaxSector
)
3915 return sprintf(page
, "none\n");
3916 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->recovery_cp
);
3920 resync_start_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3922 unsigned long long n
;
3925 if (cmd_match(buf
, "none"))
3928 err
= kstrtoull(buf
, 10, &n
);
3931 if (n
!= (sector_t
)n
)
3935 err
= mddev_lock(mddev
);
3938 if (mddev
->pers
&& !test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
3942 mddev
->recovery_cp
= n
;
3944 set_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
3946 mddev_unlock(mddev
);
3949 static struct md_sysfs_entry md_resync_start
=
3950 __ATTR_PREALLOC(resync_start
, S_IRUGO
|S_IWUSR
,
3951 resync_start_show
, resync_start_store
);
3954 * The array state can be:
3957 * No devices, no size, no level
3958 * Equivalent to STOP_ARRAY ioctl
3960 * May have some settings, but array is not active
3961 * all IO results in error
3962 * When written, doesn't tear down array, but just stops it
3963 * suspended (not supported yet)
3964 * All IO requests will block. The array can be reconfigured.
3965 * Writing this, if accepted, will block until array is quiescent
3967 * no resync can happen. no superblocks get written.
3968 * write requests fail
3970 * like readonly, but behaves like 'clean' on a write request.
3972 * clean - no pending writes, but otherwise active.
3973 * When written to inactive array, starts without resync
3974 * If a write request arrives then
3975 * if metadata is known, mark 'dirty' and switch to 'active'.
3976 * if not known, block and switch to write-pending
3977 * If written to an active array that has pending writes, then fails.
3979 * fully active: IO and resync can be happening.
3980 * When written to inactive array, starts with resync
3983 * clean, but writes are blocked waiting for 'active' to be written.
3986 * like active, but no writes have been seen for a while (100msec).
3989 enum array_state
{ clear
, inactive
, suspended
, readonly
, read_auto
, clean
, active
,
3990 write_pending
, active_idle
, bad_word
};
3991 static char *array_states
[] = {
3992 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3993 "write-pending", "active-idle", NULL
};
3995 static int match_word(const char *word
, char **list
)
3998 for (n
=0; list
[n
]; n
++)
3999 if (cmd_match(word
, list
[n
]))
4005 array_state_show(struct mddev
*mddev
, char *page
)
4007 enum array_state st
= inactive
;
4018 spin_lock(&mddev
->lock
);
4019 if (test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
))
4021 else if (mddev
->in_sync
)
4023 else if (mddev
->safemode
)
4027 spin_unlock(&mddev
->lock
);
4030 if (list_empty(&mddev
->disks
) &&
4031 mddev
->raid_disks
== 0 &&
4032 mddev
->dev_sectors
== 0)
4037 return sprintf(page
, "%s\n", array_states
[st
]);
4040 static int do_md_stop(struct mddev
*mddev
, int ro
, struct block_device
*bdev
);
4041 static int md_set_readonly(struct mddev
*mddev
, struct block_device
*bdev
);
4042 static int do_md_run(struct mddev
*mddev
);
4043 static int restart_array(struct mddev
*mddev
);
4046 array_state_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4049 enum array_state st
= match_word(buf
, array_states
);
4051 if (mddev
->pers
&& (st
== active
|| st
== clean
) && mddev
->ro
!= 1) {
4052 /* don't take reconfig_mutex when toggling between
4055 spin_lock(&mddev
->lock
);
4057 restart_array(mddev
);
4058 clear_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
4059 md_wakeup_thread(mddev
->thread
);
4060 wake_up(&mddev
->sb_wait
);
4061 } else /* st == clean */ {
4062 restart_array(mddev
);
4063 if (!set_in_sync(mddev
))
4067 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4068 spin_unlock(&mddev
->lock
);
4071 err
= mddev_lock(mddev
);
4079 /* stopping an active array */
4080 err
= do_md_stop(mddev
, 0, NULL
);
4083 /* stopping an active array */
4085 err
= do_md_stop(mddev
, 2, NULL
);
4087 err
= 0; /* already inactive */
4090 break; /* not supported yet */
4093 err
= md_set_readonly(mddev
, NULL
);
4096 set_disk_ro(mddev
->gendisk
, 1);
4097 err
= do_md_run(mddev
);
4103 err
= md_set_readonly(mddev
, NULL
);
4104 else if (mddev
->ro
== 1)
4105 err
= restart_array(mddev
);
4108 set_disk_ro(mddev
->gendisk
, 0);
4112 err
= do_md_run(mddev
);
4117 err
= restart_array(mddev
);
4120 spin_lock(&mddev
->lock
);
4121 if (!set_in_sync(mddev
))
4123 spin_unlock(&mddev
->lock
);
4129 err
= restart_array(mddev
);
4132 clear_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
4133 wake_up(&mddev
->sb_wait
);
4137 set_disk_ro(mddev
->gendisk
, 0);
4138 err
= do_md_run(mddev
);
4143 /* these cannot be set */
4148 if (mddev
->hold_active
== UNTIL_IOCTL
)
4149 mddev
->hold_active
= 0;
4150 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4152 mddev_unlock(mddev
);
4155 static struct md_sysfs_entry md_array_state
=
4156 __ATTR_PREALLOC(array_state
, S_IRUGO
|S_IWUSR
, array_state_show
, array_state_store
);
4159 max_corrected_read_errors_show(struct mddev
*mddev
, char *page
) {
4160 return sprintf(page
, "%d\n",
4161 atomic_read(&mddev
->max_corr_read_errors
));
4165 max_corrected_read_errors_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4170 rv
= kstrtouint(buf
, 10, &n
);
4173 atomic_set(&mddev
->max_corr_read_errors
, n
);
4177 static struct md_sysfs_entry max_corr_read_errors
=
4178 __ATTR(max_read_errors
, S_IRUGO
|S_IWUSR
, max_corrected_read_errors_show
,
4179 max_corrected_read_errors_store
);
4182 null_show(struct mddev
*mddev
, char *page
)
4188 new_dev_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4190 /* buf must be %d:%d\n? giving major and minor numbers */
4191 /* The new device is added to the array.
4192 * If the array has a persistent superblock, we read the
4193 * superblock to initialise info and check validity.
4194 * Otherwise, only checking done is that in bind_rdev_to_array,
4195 * which mainly checks size.
4198 int major
= simple_strtoul(buf
, &e
, 10);
4201 struct md_rdev
*rdev
;
4204 if (!*buf
|| *e
!= ':' || !e
[1] || e
[1] == '\n')
4206 minor
= simple_strtoul(e
+1, &e
, 10);
4207 if (*e
&& *e
!= '\n')
4209 dev
= MKDEV(major
, minor
);
4210 if (major
!= MAJOR(dev
) ||
4211 minor
!= MINOR(dev
))
4214 flush_workqueue(md_misc_wq
);
4216 err
= mddev_lock(mddev
);
4219 if (mddev
->persistent
) {
4220 rdev
= md_import_device(dev
, mddev
->major_version
,
4221 mddev
->minor_version
);
4222 if (!IS_ERR(rdev
) && !list_empty(&mddev
->disks
)) {
4223 struct md_rdev
*rdev0
4224 = list_entry(mddev
->disks
.next
,
4225 struct md_rdev
, same_set
);
4226 err
= super_types
[mddev
->major_version
]
4227 .load_super(rdev
, rdev0
, mddev
->minor_version
);
4231 } else if (mddev
->external
)
4232 rdev
= md_import_device(dev
, -2, -1);
4234 rdev
= md_import_device(dev
, -1, -1);
4237 mddev_unlock(mddev
);
4238 return PTR_ERR(rdev
);
4240 err
= bind_rdev_to_array(rdev
, mddev
);
4244 mddev_unlock(mddev
);
4245 return err
? err
: len
;
4248 static struct md_sysfs_entry md_new_device
=
4249 __ATTR(new_dev
, S_IWUSR
, null_show
, new_dev_store
);
4252 bitmap_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4255 unsigned long chunk
, end_chunk
;
4258 err
= mddev_lock(mddev
);
4263 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
4265 chunk
= end_chunk
= simple_strtoul(buf
, &end
, 0);
4266 if (buf
== end
) break;
4267 if (*end
== '-') { /* range */
4269 end_chunk
= simple_strtoul(buf
, &end
, 0);
4270 if (buf
== end
) break;
4272 if (*end
&& !isspace(*end
)) break;
4273 bitmap_dirty_bits(mddev
->bitmap
, chunk
, end_chunk
);
4274 buf
= skip_spaces(end
);
4276 bitmap_unplug(mddev
->bitmap
); /* flush the bits to disk */
4278 mddev_unlock(mddev
);
4282 static struct md_sysfs_entry md_bitmap
=
4283 __ATTR(bitmap_set_bits
, S_IWUSR
, null_show
, bitmap_store
);
4286 size_show(struct mddev
*mddev
, char *page
)
4288 return sprintf(page
, "%llu\n",
4289 (unsigned long long)mddev
->dev_sectors
/ 2);
4292 static int update_size(struct mddev
*mddev
, sector_t num_sectors
);
4295 size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4297 /* If array is inactive, we can reduce the component size, but
4298 * not increase it (except from 0).
4299 * If array is active, we can try an on-line resize
4302 int err
= strict_blocks_to_sectors(buf
, §ors
);
4306 err
= mddev_lock(mddev
);
4310 err
= update_size(mddev
, sectors
);
4312 md_update_sb(mddev
, 1);
4314 if (mddev
->dev_sectors
== 0 ||
4315 mddev
->dev_sectors
> sectors
)
4316 mddev
->dev_sectors
= sectors
;
4320 mddev_unlock(mddev
);
4321 return err
? err
: len
;
4324 static struct md_sysfs_entry md_size
=
4325 __ATTR(component_size
, S_IRUGO
|S_IWUSR
, size_show
, size_store
);
4327 /* Metadata version.
4329 * 'none' for arrays with no metadata (good luck...)
4330 * 'external' for arrays with externally managed metadata,
4331 * or N.M for internally known formats
4334 metadata_show(struct mddev
*mddev
, char *page
)
4336 if (mddev
->persistent
)
4337 return sprintf(page
, "%d.%d\n",
4338 mddev
->major_version
, mddev
->minor_version
);
4339 else if (mddev
->external
)
4340 return sprintf(page
, "external:%s\n", mddev
->metadata_type
);
4342 return sprintf(page
, "none\n");
4346 metadata_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4351 /* Changing the details of 'external' metadata is
4352 * always permitted. Otherwise there must be
4353 * no devices attached to the array.
4356 err
= mddev_lock(mddev
);
4360 if (mddev
->external
&& strncmp(buf
, "external:", 9) == 0)
4362 else if (!list_empty(&mddev
->disks
))
4366 if (cmd_match(buf
, "none")) {
4367 mddev
->persistent
= 0;
4368 mddev
->external
= 0;
4369 mddev
->major_version
= 0;
4370 mddev
->minor_version
= 90;
4373 if (strncmp(buf
, "external:", 9) == 0) {
4374 size_t namelen
= len
-9;
4375 if (namelen
>= sizeof(mddev
->metadata_type
))
4376 namelen
= sizeof(mddev
->metadata_type
)-1;
4377 strncpy(mddev
->metadata_type
, buf
+9, namelen
);
4378 mddev
->metadata_type
[namelen
] = 0;
4379 if (namelen
&& mddev
->metadata_type
[namelen
-1] == '\n')
4380 mddev
->metadata_type
[--namelen
] = 0;
4381 mddev
->persistent
= 0;
4382 mddev
->external
= 1;
4383 mddev
->major_version
= 0;
4384 mddev
->minor_version
= 90;
4387 major
= simple_strtoul(buf
, &e
, 10);
4389 if (e
==buf
|| *e
!= '.')
4392 minor
= simple_strtoul(buf
, &e
, 10);
4393 if (e
==buf
|| (*e
&& *e
!= '\n') )
4396 if (major
>= ARRAY_SIZE(super_types
) || super_types
[major
].name
== NULL
)
4398 mddev
->major_version
= major
;
4399 mddev
->minor_version
= minor
;
4400 mddev
->persistent
= 1;
4401 mddev
->external
= 0;
4404 mddev_unlock(mddev
);
4408 static struct md_sysfs_entry md_metadata
=
4409 __ATTR_PREALLOC(metadata_version
, S_IRUGO
|S_IWUSR
, metadata_show
, metadata_store
);
4412 action_show(struct mddev
*mddev
, char *page
)
4414 char *type
= "idle";
4415 unsigned long recovery
= mddev
->recovery
;
4416 if (test_bit(MD_RECOVERY_FROZEN
, &recovery
))
4418 else if (test_bit(MD_RECOVERY_RUNNING
, &recovery
) ||
4419 (!mddev
->ro
&& test_bit(MD_RECOVERY_NEEDED
, &recovery
))) {
4420 if (test_bit(MD_RECOVERY_RESHAPE
, &recovery
))
4422 else if (test_bit(MD_RECOVERY_SYNC
, &recovery
)) {
4423 if (!test_bit(MD_RECOVERY_REQUESTED
, &recovery
))
4425 else if (test_bit(MD_RECOVERY_CHECK
, &recovery
))
4429 } else if (test_bit(MD_RECOVERY_RECOVER
, &recovery
))
4431 else if (mddev
->reshape_position
!= MaxSector
)
4434 return sprintf(page
, "%s\n", type
);
4438 action_store(struct mddev
*mddev
, const char *page
, size_t len
)
4440 if (!mddev
->pers
|| !mddev
->pers
->sync_request
)
4444 if (cmd_match(page
, "idle") || cmd_match(page
, "frozen")) {
4445 if (cmd_match(page
, "frozen"))
4446 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4448 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4449 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
4450 mddev_lock(mddev
) == 0) {
4451 flush_workqueue(md_misc_wq
);
4452 if (mddev
->sync_thread
) {
4453 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4454 md_reap_sync_thread(mddev
);
4456 mddev_unlock(mddev
);
4458 } else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4460 else if (cmd_match(page
, "resync"))
4461 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4462 else if (cmd_match(page
, "recover")) {
4463 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4464 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
4465 } else if (cmd_match(page
, "reshape")) {
4467 if (mddev
->pers
->start_reshape
== NULL
)
4469 err
= mddev_lock(mddev
);
4471 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4474 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4475 err
= mddev
->pers
->start_reshape(mddev
);
4477 mddev_unlock(mddev
);
4481 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
4483 if (cmd_match(page
, "check"))
4484 set_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
4485 else if (!cmd_match(page
, "repair"))
4487 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4488 set_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
4489 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
4491 if (mddev
->ro
== 2) {
4492 /* A write to sync_action is enough to justify
4493 * canceling read-auto mode
4496 md_wakeup_thread(mddev
->sync_thread
);
4498 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4499 md_wakeup_thread(mddev
->thread
);
4500 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
4504 static struct md_sysfs_entry md_scan_mode
=
4505 __ATTR_PREALLOC(sync_action
, S_IRUGO
|S_IWUSR
, action_show
, action_store
);
4508 last_sync_action_show(struct mddev
*mddev
, char *page
)
4510 return sprintf(page
, "%s\n", mddev
->last_sync_action
);
4513 static struct md_sysfs_entry md_last_scan_mode
= __ATTR_RO(last_sync_action
);
4516 mismatch_cnt_show(struct mddev
*mddev
, char *page
)
4518 return sprintf(page
, "%llu\n",
4519 (unsigned long long)
4520 atomic64_read(&mddev
->resync_mismatches
));
4523 static struct md_sysfs_entry md_mismatches
= __ATTR_RO(mismatch_cnt
);
4526 sync_min_show(struct mddev
*mddev
, char *page
)
4528 return sprintf(page
, "%d (%s)\n", speed_min(mddev
),
4529 mddev
->sync_speed_min
? "local": "system");
4533 sync_min_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4538 if (strncmp(buf
, "system", 6)==0) {
4541 rv
= kstrtouint(buf
, 10, &min
);
4547 mddev
->sync_speed_min
= min
;
4551 static struct md_sysfs_entry md_sync_min
=
4552 __ATTR(sync_speed_min
, S_IRUGO
|S_IWUSR
, sync_min_show
, sync_min_store
);
4555 sync_max_show(struct mddev
*mddev
, char *page
)
4557 return sprintf(page
, "%d (%s)\n", speed_max(mddev
),
4558 mddev
->sync_speed_max
? "local": "system");
4562 sync_max_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4567 if (strncmp(buf
, "system", 6)==0) {
4570 rv
= kstrtouint(buf
, 10, &max
);
4576 mddev
->sync_speed_max
= max
;
4580 static struct md_sysfs_entry md_sync_max
=
4581 __ATTR(sync_speed_max
, S_IRUGO
|S_IWUSR
, sync_max_show
, sync_max_store
);
4584 degraded_show(struct mddev
*mddev
, char *page
)
4586 return sprintf(page
, "%d\n", mddev
->degraded
);
4588 static struct md_sysfs_entry md_degraded
= __ATTR_RO(degraded
);
4591 sync_force_parallel_show(struct mddev
*mddev
, char *page
)
4593 return sprintf(page
, "%d\n", mddev
->parallel_resync
);
4597 sync_force_parallel_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4601 if (kstrtol(buf
, 10, &n
))
4604 if (n
!= 0 && n
!= 1)
4607 mddev
->parallel_resync
= n
;
4609 if (mddev
->sync_thread
)
4610 wake_up(&resync_wait
);
4615 /* force parallel resync, even with shared block devices */
4616 static struct md_sysfs_entry md_sync_force_parallel
=
4617 __ATTR(sync_force_parallel
, S_IRUGO
|S_IWUSR
,
4618 sync_force_parallel_show
, sync_force_parallel_store
);
4621 sync_speed_show(struct mddev
*mddev
, char *page
)
4623 unsigned long resync
, dt
, db
;
4624 if (mddev
->curr_resync
== 0)
4625 return sprintf(page
, "none\n");
4626 resync
= mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
);
4627 dt
= (jiffies
- mddev
->resync_mark
) / HZ
;
4629 db
= resync
- mddev
->resync_mark_cnt
;
4630 return sprintf(page
, "%lu\n", db
/dt
/2); /* K/sec */
4633 static struct md_sysfs_entry md_sync_speed
= __ATTR_RO(sync_speed
);
4636 sync_completed_show(struct mddev
*mddev
, char *page
)
4638 unsigned long long max_sectors
, resync
;
4640 if (!test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4641 return sprintf(page
, "none\n");
4643 if (mddev
->curr_resync
== 1 ||
4644 mddev
->curr_resync
== 2)
4645 return sprintf(page
, "delayed\n");
4647 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
4648 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
4649 max_sectors
= mddev
->resync_max_sectors
;
4651 max_sectors
= mddev
->dev_sectors
;
4653 resync
= mddev
->curr_resync_completed
;
4654 return sprintf(page
, "%llu / %llu\n", resync
, max_sectors
);
4657 static struct md_sysfs_entry md_sync_completed
=
4658 __ATTR_PREALLOC(sync_completed
, S_IRUGO
, sync_completed_show
, NULL
);
4661 min_sync_show(struct mddev
*mddev
, char *page
)
4663 return sprintf(page
, "%llu\n",
4664 (unsigned long long)mddev
->resync_min
);
4667 min_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4669 unsigned long long min
;
4672 if (kstrtoull(buf
, 10, &min
))
4675 spin_lock(&mddev
->lock
);
4677 if (min
> mddev
->resync_max
)
4681 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4684 /* Round down to multiple of 4K for safety */
4685 mddev
->resync_min
= round_down(min
, 8);
4689 spin_unlock(&mddev
->lock
);
4693 static struct md_sysfs_entry md_min_sync
=
4694 __ATTR(sync_min
, S_IRUGO
|S_IWUSR
, min_sync_show
, min_sync_store
);
4697 max_sync_show(struct mddev
*mddev
, char *page
)
4699 if (mddev
->resync_max
== MaxSector
)
4700 return sprintf(page
, "max\n");
4702 return sprintf(page
, "%llu\n",
4703 (unsigned long long)mddev
->resync_max
);
4706 max_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4709 spin_lock(&mddev
->lock
);
4710 if (strncmp(buf
, "max", 3) == 0)
4711 mddev
->resync_max
= MaxSector
;
4713 unsigned long long max
;
4717 if (kstrtoull(buf
, 10, &max
))
4719 if (max
< mddev
->resync_min
)
4723 if (max
< mddev
->resync_max
&&
4725 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4728 /* Must be a multiple of chunk_size */
4729 chunk
= mddev
->chunk_sectors
;
4731 sector_t temp
= max
;
4734 if (sector_div(temp
, chunk
))
4737 mddev
->resync_max
= max
;
4739 wake_up(&mddev
->recovery_wait
);
4742 spin_unlock(&mddev
->lock
);
4746 static struct md_sysfs_entry md_max_sync
=
4747 __ATTR(sync_max
, S_IRUGO
|S_IWUSR
, max_sync_show
, max_sync_store
);
4750 suspend_lo_show(struct mddev
*mddev
, char *page
)
4752 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_lo
);
4756 suspend_lo_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4758 unsigned long long old
, new;
4761 err
= kstrtoull(buf
, 10, &new);
4764 if (new != (sector_t
)new)
4767 err
= mddev_lock(mddev
);
4771 if (mddev
->pers
== NULL
||
4772 mddev
->pers
->quiesce
== NULL
)
4774 old
= mddev
->suspend_lo
;
4775 mddev
->suspend_lo
= new;
4777 /* Shrinking suspended region */
4778 mddev
->pers
->quiesce(mddev
, 2);
4780 /* Expanding suspended region - need to wait */
4781 mddev
->pers
->quiesce(mddev
, 1);
4782 mddev
->pers
->quiesce(mddev
, 0);
4786 mddev_unlock(mddev
);
4789 static struct md_sysfs_entry md_suspend_lo
=
4790 __ATTR(suspend_lo
, S_IRUGO
|S_IWUSR
, suspend_lo_show
, suspend_lo_store
);
4793 suspend_hi_show(struct mddev
*mddev
, char *page
)
4795 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_hi
);
4799 suspend_hi_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4801 unsigned long long old
, new;
4804 err
= kstrtoull(buf
, 10, &new);
4807 if (new != (sector_t
)new)
4810 err
= mddev_lock(mddev
);
4814 if (mddev
->pers
== NULL
||
4815 mddev
->pers
->quiesce
== NULL
)
4817 old
= mddev
->suspend_hi
;
4818 mddev
->suspend_hi
= new;
4820 /* Shrinking suspended region */
4821 mddev
->pers
->quiesce(mddev
, 2);
4823 /* Expanding suspended region - need to wait */
4824 mddev
->pers
->quiesce(mddev
, 1);
4825 mddev
->pers
->quiesce(mddev
, 0);
4829 mddev_unlock(mddev
);
4832 static struct md_sysfs_entry md_suspend_hi
=
4833 __ATTR(suspend_hi
, S_IRUGO
|S_IWUSR
, suspend_hi_show
, suspend_hi_store
);
4836 reshape_position_show(struct mddev
*mddev
, char *page
)
4838 if (mddev
->reshape_position
!= MaxSector
)
4839 return sprintf(page
, "%llu\n",
4840 (unsigned long long)mddev
->reshape_position
);
4841 strcpy(page
, "none\n");
4846 reshape_position_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4848 struct md_rdev
*rdev
;
4849 unsigned long long new;
4852 err
= kstrtoull(buf
, 10, &new);
4855 if (new != (sector_t
)new)
4857 err
= mddev_lock(mddev
);
4863 mddev
->reshape_position
= new;
4864 mddev
->delta_disks
= 0;
4865 mddev
->reshape_backwards
= 0;
4866 mddev
->new_level
= mddev
->level
;
4867 mddev
->new_layout
= mddev
->layout
;
4868 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
4869 rdev_for_each(rdev
, mddev
)
4870 rdev
->new_data_offset
= rdev
->data_offset
;
4873 mddev_unlock(mddev
);
4877 static struct md_sysfs_entry md_reshape_position
=
4878 __ATTR(reshape_position
, S_IRUGO
|S_IWUSR
, reshape_position_show
,
4879 reshape_position_store
);
4882 reshape_direction_show(struct mddev
*mddev
, char *page
)
4884 return sprintf(page
, "%s\n",
4885 mddev
->reshape_backwards
? "backwards" : "forwards");
4889 reshape_direction_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4894 if (cmd_match(buf
, "forwards"))
4896 else if (cmd_match(buf
, "backwards"))
4900 if (mddev
->reshape_backwards
== backwards
)
4903 err
= mddev_lock(mddev
);
4906 /* check if we are allowed to change */
4907 if (mddev
->delta_disks
)
4909 else if (mddev
->persistent
&&
4910 mddev
->major_version
== 0)
4913 mddev
->reshape_backwards
= backwards
;
4914 mddev_unlock(mddev
);
4918 static struct md_sysfs_entry md_reshape_direction
=
4919 __ATTR(reshape_direction
, S_IRUGO
|S_IWUSR
, reshape_direction_show
,
4920 reshape_direction_store
);
4923 array_size_show(struct mddev
*mddev
, char *page
)
4925 if (mddev
->external_size
)
4926 return sprintf(page
, "%llu\n",
4927 (unsigned long long)mddev
->array_sectors
/2);
4929 return sprintf(page
, "default\n");
4933 array_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4938 err
= mddev_lock(mddev
);
4942 /* cluster raid doesn't support change array_sectors */
4943 if (mddev_is_clustered(mddev
))
4946 if (strncmp(buf
, "default", 7) == 0) {
4948 sectors
= mddev
->pers
->size(mddev
, 0, 0);
4950 sectors
= mddev
->array_sectors
;
4952 mddev
->external_size
= 0;
4954 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
4956 else if (mddev
->pers
&& mddev
->pers
->size(mddev
, 0, 0) < sectors
)
4959 mddev
->external_size
= 1;
4963 mddev
->array_sectors
= sectors
;
4965 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
4966 revalidate_disk(mddev
->gendisk
);
4969 mddev_unlock(mddev
);
4973 static struct md_sysfs_entry md_array_size
=
4974 __ATTR(array_size
, S_IRUGO
|S_IWUSR
, array_size_show
,
4978 consistency_policy_show(struct mddev
*mddev
, char *page
)
4982 if (test_bit(MD_HAS_JOURNAL
, &mddev
->flags
)) {
4983 ret
= sprintf(page
, "journal\n");
4984 } else if (test_bit(MD_HAS_PPL
, &mddev
->flags
)) {
4985 ret
= sprintf(page
, "ppl\n");
4986 } else if (mddev
->bitmap
) {
4987 ret
= sprintf(page
, "bitmap\n");
4988 } else if (mddev
->pers
) {
4989 if (mddev
->pers
->sync_request
)
4990 ret
= sprintf(page
, "resync\n");
4992 ret
= sprintf(page
, "none\n");
4994 ret
= sprintf(page
, "unknown\n");
5001 consistency_policy_store(struct mddev
*mddev
, const char *buf
, size_t len
)
5006 if (mddev
->pers
->change_consistency_policy
)
5007 err
= mddev
->pers
->change_consistency_policy(mddev
, buf
);
5010 } else if (mddev
->external
&& strncmp(buf
, "ppl", 3) == 0) {
5011 set_bit(MD_HAS_PPL
, &mddev
->flags
);
5016 return err
? err
: len
;
5019 static struct md_sysfs_entry md_consistency_policy
=
5020 __ATTR(consistency_policy
, S_IRUGO
| S_IWUSR
, consistency_policy_show
,
5021 consistency_policy_store
);
5023 static struct attribute
*md_default_attrs
[] = {
5026 &md_raid_disks
.attr
,
5027 &md_chunk_size
.attr
,
5029 &md_resync_start
.attr
,
5031 &md_new_device
.attr
,
5032 &md_safe_delay
.attr
,
5033 &md_array_state
.attr
,
5034 &md_reshape_position
.attr
,
5035 &md_reshape_direction
.attr
,
5036 &md_array_size
.attr
,
5037 &max_corr_read_errors
.attr
,
5038 &md_consistency_policy
.attr
,
5042 static struct attribute
*md_redundancy_attrs
[] = {
5044 &md_last_scan_mode
.attr
,
5045 &md_mismatches
.attr
,
5048 &md_sync_speed
.attr
,
5049 &md_sync_force_parallel
.attr
,
5050 &md_sync_completed
.attr
,
5053 &md_suspend_lo
.attr
,
5054 &md_suspend_hi
.attr
,
5059 static struct attribute_group md_redundancy_group
= {
5061 .attrs
= md_redundancy_attrs
,
5065 md_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
5067 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
5068 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
5073 spin_lock(&all_mddevs_lock
);
5074 if (list_empty(&mddev
->all_mddevs
)) {
5075 spin_unlock(&all_mddevs_lock
);
5079 spin_unlock(&all_mddevs_lock
);
5081 rv
= entry
->show(mddev
, page
);
5087 md_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
5088 const char *page
, size_t length
)
5090 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
5091 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
5096 if (!capable(CAP_SYS_ADMIN
))
5098 spin_lock(&all_mddevs_lock
);
5099 if (list_empty(&mddev
->all_mddevs
)) {
5100 spin_unlock(&all_mddevs_lock
);
5104 spin_unlock(&all_mddevs_lock
);
5105 rv
= entry
->store(mddev
, page
, length
);
5110 static void md_free(struct kobject
*ko
)
5112 struct mddev
*mddev
= container_of(ko
, struct mddev
, kobj
);
5114 if (mddev
->sysfs_state
)
5115 sysfs_put(mddev
->sysfs_state
);
5118 blk_cleanup_queue(mddev
->queue
);
5119 if (mddev
->gendisk
) {
5120 del_gendisk(mddev
->gendisk
);
5121 put_disk(mddev
->gendisk
);
5127 static const struct sysfs_ops md_sysfs_ops
= {
5128 .show
= md_attr_show
,
5129 .store
= md_attr_store
,
5131 static struct kobj_type md_ktype
= {
5133 .sysfs_ops
= &md_sysfs_ops
,
5134 .default_attrs
= md_default_attrs
,
5139 static void mddev_delayed_delete(struct work_struct
*ws
)
5141 struct mddev
*mddev
= container_of(ws
, struct mddev
, del_work
);
5143 sysfs_remove_group(&mddev
->kobj
, &md_bitmap_group
);
5144 kobject_del(&mddev
->kobj
);
5145 kobject_put(&mddev
->kobj
);
5148 static int md_alloc(dev_t dev
, char *name
)
5150 static DEFINE_MUTEX(disks_mutex
);
5151 struct mddev
*mddev
= mddev_find(dev
);
5152 struct gendisk
*disk
;
5161 partitioned
= (MAJOR(mddev
->unit
) != MD_MAJOR
);
5162 shift
= partitioned
? MdpMinorShift
: 0;
5163 unit
= MINOR(mddev
->unit
) >> shift
;
5165 /* wait for any previous instance of this device to be
5166 * completely removed (mddev_delayed_delete).
5168 flush_workqueue(md_misc_wq
);
5170 mutex_lock(&disks_mutex
);
5176 /* Need to ensure that 'name' is not a duplicate.
5178 struct mddev
*mddev2
;
5179 spin_lock(&all_mddevs_lock
);
5181 list_for_each_entry(mddev2
, &all_mddevs
, all_mddevs
)
5182 if (mddev2
->gendisk
&&
5183 strcmp(mddev2
->gendisk
->disk_name
, name
) == 0) {
5184 spin_unlock(&all_mddevs_lock
);
5187 spin_unlock(&all_mddevs_lock
);
5191 mddev
->queue
= blk_alloc_queue(GFP_KERNEL
);
5194 mddev
->queue
->queuedata
= mddev
;
5196 blk_queue_make_request(mddev
->queue
, md_make_request
);
5197 blk_set_stacking_limits(&mddev
->queue
->limits
);
5199 disk
= alloc_disk(1 << shift
);
5201 blk_cleanup_queue(mddev
->queue
);
5202 mddev
->queue
= NULL
;
5205 disk
->major
= MAJOR(mddev
->unit
);
5206 disk
->first_minor
= unit
<< shift
;
5208 strcpy(disk
->disk_name
, name
);
5209 else if (partitioned
)
5210 sprintf(disk
->disk_name
, "md_d%d", unit
);
5212 sprintf(disk
->disk_name
, "md%d", unit
);
5213 disk
->fops
= &md_fops
;
5214 disk
->private_data
= mddev
;
5215 disk
->queue
= mddev
->queue
;
5216 blk_queue_write_cache(mddev
->queue
, true, true);
5217 /* Allow extended partitions. This makes the
5218 * 'mdp' device redundant, but we can't really
5221 disk
->flags
|= GENHD_FL_EXT_DEVT
;
5222 mddev
->gendisk
= disk
;
5223 /* As soon as we call add_disk(), another thread could get
5224 * through to md_open, so make sure it doesn't get too far
5226 mutex_lock(&mddev
->open_mutex
);
5229 error
= kobject_init_and_add(&mddev
->kobj
, &md_ktype
,
5230 &disk_to_dev(disk
)->kobj
, "%s", "md");
5232 /* This isn't possible, but as kobject_init_and_add is marked
5233 * __must_check, we must do something with the result
5235 pr_debug("md: cannot register %s/md - name in use\n",
5239 if (mddev
->kobj
.sd
&&
5240 sysfs_create_group(&mddev
->kobj
, &md_bitmap_group
))
5241 pr_debug("pointless warning\n");
5242 mutex_unlock(&mddev
->open_mutex
);
5244 mutex_unlock(&disks_mutex
);
5245 if (!error
&& mddev
->kobj
.sd
) {
5246 kobject_uevent(&mddev
->kobj
, KOBJ_ADD
);
5247 mddev
->sysfs_state
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "array_state");
5253 static struct kobject
*md_probe(dev_t dev
, int *part
, void *data
)
5255 md_alloc(dev
, NULL
);
5259 static int add_named_array(const char *val
, struct kernel_param
*kp
)
5261 /* val must be "md_*" where * is not all digits.
5262 * We allocate an array with a large free minor number, and
5263 * set the name to val. val must not already be an active name.
5265 int len
= strlen(val
);
5266 char buf
[DISK_NAME_LEN
];
5268 while (len
&& val
[len
-1] == '\n')
5270 if (len
>= DISK_NAME_LEN
)
5272 strlcpy(buf
, val
, len
+1);
5273 if (strncmp(buf
, "md_", 3) != 0)
5275 return md_alloc(0, buf
);
5278 static void md_safemode_timeout(unsigned long data
)
5280 struct mddev
*mddev
= (struct mddev
*) data
;
5282 if (!atomic_read(&mddev
->writes_pending
)) {
5283 mddev
->safemode
= 1;
5284 if (mddev
->external
)
5285 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5287 md_wakeup_thread(mddev
->thread
);
5290 static int start_dirty_degraded
;
5292 int md_run(struct mddev
*mddev
)
5295 struct md_rdev
*rdev
;
5296 struct md_personality
*pers
;
5298 if (list_empty(&mddev
->disks
))
5299 /* cannot run an array with no devices.. */
5304 /* Cannot run until previous stop completes properly */
5305 if (mddev
->sysfs_active
)
5309 * Analyze all RAID superblock(s)
5311 if (!mddev
->raid_disks
) {
5312 if (!mddev
->persistent
)
5317 if (mddev
->level
!= LEVEL_NONE
)
5318 request_module("md-level-%d", mddev
->level
);
5319 else if (mddev
->clevel
[0])
5320 request_module("md-%s", mddev
->clevel
);
5323 * Drop all container device buffers, from now on
5324 * the only valid external interface is through the md
5327 rdev_for_each(rdev
, mddev
) {
5328 if (test_bit(Faulty
, &rdev
->flags
))
5330 sync_blockdev(rdev
->bdev
);
5331 invalidate_bdev(rdev
->bdev
);
5333 /* perform some consistency tests on the device.
5334 * We don't want the data to overlap the metadata,
5335 * Internal Bitmap issues have been handled elsewhere.
5337 if (rdev
->meta_bdev
) {
5338 /* Nothing to check */;
5339 } else if (rdev
->data_offset
< rdev
->sb_start
) {
5340 if (mddev
->dev_sectors
&&
5341 rdev
->data_offset
+ mddev
->dev_sectors
5343 pr_warn("md: %s: data overlaps metadata\n",
5348 if (rdev
->sb_start
+ rdev
->sb_size
/512
5349 > rdev
->data_offset
) {
5350 pr_warn("md: %s: metadata overlaps data\n",
5355 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
5358 if (mddev
->bio_set
== NULL
) {
5359 mddev
->bio_set
= bioset_create(BIO_POOL_SIZE
, 0);
5360 if (!mddev
->bio_set
)
5364 spin_lock(&pers_lock
);
5365 pers
= find_pers(mddev
->level
, mddev
->clevel
);
5366 if (!pers
|| !try_module_get(pers
->owner
)) {
5367 spin_unlock(&pers_lock
);
5368 if (mddev
->level
!= LEVEL_NONE
)
5369 pr_warn("md: personality for level %d is not loaded!\n",
5372 pr_warn("md: personality for level %s is not loaded!\n",
5376 spin_unlock(&pers_lock
);
5377 if (mddev
->level
!= pers
->level
) {
5378 mddev
->level
= pers
->level
;
5379 mddev
->new_level
= pers
->level
;
5381 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
5383 if (mddev
->reshape_position
!= MaxSector
&&
5384 pers
->start_reshape
== NULL
) {
5385 /* This personality cannot handle reshaping... */
5386 module_put(pers
->owner
);
5390 if (pers
->sync_request
) {
5391 /* Warn if this is a potentially silly
5394 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
5395 struct md_rdev
*rdev2
;
5398 rdev_for_each(rdev
, mddev
)
5399 rdev_for_each(rdev2
, mddev
) {
5401 rdev
->bdev
->bd_contains
==
5402 rdev2
->bdev
->bd_contains
) {
5403 pr_warn("%s: WARNING: %s appears to be on the same physical disk as %s.\n",
5405 bdevname(rdev
->bdev
,b
),
5406 bdevname(rdev2
->bdev
,b2
));
5412 pr_warn("True protection against single-disk failure might be compromised.\n");
5415 mddev
->recovery
= 0;
5416 /* may be over-ridden by personality */
5417 mddev
->resync_max_sectors
= mddev
->dev_sectors
;
5419 mddev
->ok_start_degraded
= start_dirty_degraded
;
5421 if (start_readonly
&& mddev
->ro
== 0)
5422 mddev
->ro
= 2; /* read-only, but switch on first write */
5425 * NOTE: some pers->run(), for example r5l_recovery_log(), wakes
5426 * up mddev->thread. It is important to initialize critical
5427 * resources for mddev->thread BEFORE calling pers->run().
5429 err
= pers
->run(mddev
);
5431 pr_warn("md: pers->run() failed ...\n");
5432 else if (pers
->size(mddev
, 0, 0) < mddev
->array_sectors
) {
5433 WARN_ONCE(!mddev
->external_size
,
5434 "%s: default size too small, but 'external_size' not in effect?\n",
5436 pr_warn("md: invalid array_size %llu > default size %llu\n",
5437 (unsigned long long)mddev
->array_sectors
/ 2,
5438 (unsigned long long)pers
->size(mddev
, 0, 0) / 2);
5441 if (err
== 0 && pers
->sync_request
&&
5442 (mddev
->bitmap_info
.file
|| mddev
->bitmap_info
.offset
)) {
5443 struct bitmap
*bitmap
;
5445 bitmap
= bitmap_create(mddev
, -1);
5446 if (IS_ERR(bitmap
)) {
5447 err
= PTR_ERR(bitmap
);
5448 pr_warn("%s: failed to create bitmap (%d)\n",
5449 mdname(mddev
), err
);
5451 mddev
->bitmap
= bitmap
;
5455 mddev_detach(mddev
);
5457 pers
->free(mddev
, mddev
->private);
5458 mddev
->private = NULL
;
5459 module_put(pers
->owner
);
5460 bitmap_destroy(mddev
);
5466 rdev_for_each(rdev
, mddev
) {
5467 if (rdev
->raid_disk
>= 0 &&
5468 !blk_queue_nonrot(bdev_get_queue(rdev
->bdev
))) {
5473 if (mddev
->degraded
)
5476 queue_flag_set_unlocked(QUEUE_FLAG_NONROT
, mddev
->queue
);
5478 queue_flag_clear_unlocked(QUEUE_FLAG_NONROT
, mddev
->queue
);
5479 mddev
->queue
->backing_dev_info
->congested_data
= mddev
;
5480 mddev
->queue
->backing_dev_info
->congested_fn
= md_congested
;
5482 if (pers
->sync_request
) {
5483 if (mddev
->kobj
.sd
&&
5484 sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
5485 pr_warn("md: cannot register extra attributes for %s\n",
5487 mddev
->sysfs_action
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "sync_action");
5488 } else if (mddev
->ro
== 2) /* auto-readonly not meaningful */
5491 atomic_set(&mddev
->writes_pending
,0);
5492 atomic_set(&mddev
->max_corr_read_errors
,
5493 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS
);
5494 mddev
->safemode
= 0;
5495 if (mddev_is_clustered(mddev
))
5496 mddev
->safemode_delay
= 0;
5498 mddev
->safemode_delay
= (200 * HZ
)/1000 +1; /* 200 msec delay */
5501 spin_lock(&mddev
->lock
);
5503 spin_unlock(&mddev
->lock
);
5504 rdev_for_each(rdev
, mddev
)
5505 if (rdev
->raid_disk
>= 0)
5506 if (sysfs_link_rdev(mddev
, rdev
))
5507 /* failure here is OK */;
5509 if (mddev
->degraded
&& !mddev
->ro
)
5510 /* This ensures that recovering status is reported immediately
5511 * via sysfs - until a lack of spares is confirmed.
5513 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
5514 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5516 if (mddev
->sb_flags
)
5517 md_update_sb(mddev
, 0);
5519 md_new_event(mddev
);
5520 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5521 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
5522 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
5525 EXPORT_SYMBOL_GPL(md_run
);
5527 static int do_md_run(struct mddev
*mddev
)
5531 err
= md_run(mddev
);
5534 err
= bitmap_load(mddev
);
5536 bitmap_destroy(mddev
);
5540 if (mddev_is_clustered(mddev
))
5541 md_allow_write(mddev
);
5543 md_wakeup_thread(mddev
->thread
);
5544 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
5546 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
5547 revalidate_disk(mddev
->gendisk
);
5549 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
5554 static int restart_array(struct mddev
*mddev
)
5556 struct gendisk
*disk
= mddev
->gendisk
;
5558 /* Complain if it has no devices */
5559 if (list_empty(&mddev
->disks
))
5565 if (test_bit(MD_HAS_JOURNAL
, &mddev
->flags
)) {
5566 struct md_rdev
*rdev
;
5567 bool has_journal
= false;
5570 rdev_for_each_rcu(rdev
, mddev
) {
5571 if (test_bit(Journal
, &rdev
->flags
) &&
5572 !test_bit(Faulty
, &rdev
->flags
)) {
5579 /* Don't restart rw with journal missing/faulty */
5584 mddev
->safemode
= 0;
5586 set_disk_ro(disk
, 0);
5587 pr_debug("md: %s switched to read-write mode.\n", mdname(mddev
));
5588 /* Kick recovery or resync if necessary */
5589 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5590 md_wakeup_thread(mddev
->thread
);
5591 md_wakeup_thread(mddev
->sync_thread
);
5592 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5596 static void md_clean(struct mddev
*mddev
)
5598 mddev
->array_sectors
= 0;
5599 mddev
->external_size
= 0;
5600 mddev
->dev_sectors
= 0;
5601 mddev
->raid_disks
= 0;
5602 mddev
->recovery_cp
= 0;
5603 mddev
->resync_min
= 0;
5604 mddev
->resync_max
= MaxSector
;
5605 mddev
->reshape_position
= MaxSector
;
5606 mddev
->external
= 0;
5607 mddev
->persistent
= 0;
5608 mddev
->level
= LEVEL_NONE
;
5609 mddev
->clevel
[0] = 0;
5611 mddev
->sb_flags
= 0;
5613 mddev
->metadata_type
[0] = 0;
5614 mddev
->chunk_sectors
= 0;
5615 mddev
->ctime
= mddev
->utime
= 0;
5617 mddev
->max_disks
= 0;
5619 mddev
->can_decrease_events
= 0;
5620 mddev
->delta_disks
= 0;
5621 mddev
->reshape_backwards
= 0;
5622 mddev
->new_level
= LEVEL_NONE
;
5623 mddev
->new_layout
= 0;
5624 mddev
->new_chunk_sectors
= 0;
5625 mddev
->curr_resync
= 0;
5626 atomic64_set(&mddev
->resync_mismatches
, 0);
5627 mddev
->suspend_lo
= mddev
->suspend_hi
= 0;
5628 mddev
->sync_speed_min
= mddev
->sync_speed_max
= 0;
5629 mddev
->recovery
= 0;
5632 mddev
->degraded
= 0;
5633 mddev
->safemode
= 0;
5634 mddev
->private = NULL
;
5635 mddev
->cluster_info
= NULL
;
5636 mddev
->bitmap_info
.offset
= 0;
5637 mddev
->bitmap_info
.default_offset
= 0;
5638 mddev
->bitmap_info
.default_space
= 0;
5639 mddev
->bitmap_info
.chunksize
= 0;
5640 mddev
->bitmap_info
.daemon_sleep
= 0;
5641 mddev
->bitmap_info
.max_write_behind
= 0;
5642 mddev
->bitmap_info
.nodes
= 0;
5645 static void __md_stop_writes(struct mddev
*mddev
)
5647 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5648 flush_workqueue(md_misc_wq
);
5649 if (mddev
->sync_thread
) {
5650 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5651 md_reap_sync_thread(mddev
);
5654 del_timer_sync(&mddev
->safemode_timer
);
5656 if (mddev
->pers
&& mddev
->pers
->quiesce
) {
5657 mddev
->pers
->quiesce(mddev
, 1);
5658 mddev
->pers
->quiesce(mddev
, 0);
5660 bitmap_flush(mddev
);
5662 if (mddev
->ro
== 0 &&
5663 ((!mddev
->in_sync
&& !mddev_is_clustered(mddev
)) ||
5665 /* mark array as shutdown cleanly */
5666 if (!mddev_is_clustered(mddev
))
5668 md_update_sb(mddev
, 1);
5672 void md_stop_writes(struct mddev
*mddev
)
5674 mddev_lock_nointr(mddev
);
5675 __md_stop_writes(mddev
);
5676 mddev_unlock(mddev
);
5678 EXPORT_SYMBOL_GPL(md_stop_writes
);
5680 static void mddev_detach(struct mddev
*mddev
)
5682 bitmap_wait_behind_writes(mddev
);
5683 if (mddev
->pers
&& mddev
->pers
->quiesce
) {
5684 mddev
->pers
->quiesce(mddev
, 1);
5685 mddev
->pers
->quiesce(mddev
, 0);
5687 md_unregister_thread(&mddev
->thread
);
5689 blk_sync_queue(mddev
->queue
); /* the unplug fn references 'conf'*/
5692 static void __md_stop(struct mddev
*mddev
)
5694 struct md_personality
*pers
= mddev
->pers
;
5695 bitmap_destroy(mddev
);
5696 mddev_detach(mddev
);
5697 /* Ensure ->event_work is done */
5698 flush_workqueue(md_misc_wq
);
5699 spin_lock(&mddev
->lock
);
5701 spin_unlock(&mddev
->lock
);
5702 pers
->free(mddev
, mddev
->private);
5703 mddev
->private = NULL
;
5704 if (pers
->sync_request
&& mddev
->to_remove
== NULL
)
5705 mddev
->to_remove
= &md_redundancy_group
;
5706 module_put(pers
->owner
);
5707 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5710 void md_stop(struct mddev
*mddev
)
5712 /* stop the array and free an attached data structures.
5713 * This is called from dm-raid
5717 bioset_free(mddev
->bio_set
);
5720 EXPORT_SYMBOL_GPL(md_stop
);
5722 static int md_set_readonly(struct mddev
*mddev
, struct block_device
*bdev
)
5727 if (!test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
)) {
5729 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5730 md_wakeup_thread(mddev
->thread
);
5732 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
5733 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5734 if (mddev
->sync_thread
)
5735 /* Thread might be blocked waiting for metadata update
5736 * which will now never happen */
5737 wake_up_process(mddev
->sync_thread
->tsk
);
5739 if (mddev
->external
&& test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
))
5741 mddev_unlock(mddev
);
5742 wait_event(resync_wait
, !test_bit(MD_RECOVERY_RUNNING
,
5744 wait_event(mddev
->sb_wait
,
5745 !test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
));
5746 mddev_lock_nointr(mddev
);
5748 mutex_lock(&mddev
->open_mutex
);
5749 if ((mddev
->pers
&& atomic_read(&mddev
->openers
) > !!bdev
) ||
5750 mddev
->sync_thread
||
5751 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
)) {
5752 pr_warn("md: %s still in use.\n",mdname(mddev
));
5754 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5755 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5756 md_wakeup_thread(mddev
->thread
);
5762 __md_stop_writes(mddev
);
5768 set_disk_ro(mddev
->gendisk
, 1);
5769 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5770 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5771 md_wakeup_thread(mddev
->thread
);
5772 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5776 mutex_unlock(&mddev
->open_mutex
);
5781 * 0 - completely stop and dis-assemble array
5782 * 2 - stop but do not disassemble array
5784 static int do_md_stop(struct mddev
*mddev
, int mode
,
5785 struct block_device
*bdev
)
5787 struct gendisk
*disk
= mddev
->gendisk
;
5788 struct md_rdev
*rdev
;
5791 if (!test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
)) {
5793 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5794 md_wakeup_thread(mddev
->thread
);
5796 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
5797 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5798 if (mddev
->sync_thread
)
5799 /* Thread might be blocked waiting for metadata update
5800 * which will now never happen */
5801 wake_up_process(mddev
->sync_thread
->tsk
);
5803 mddev_unlock(mddev
);
5804 wait_event(resync_wait
, (mddev
->sync_thread
== NULL
&&
5805 !test_bit(MD_RECOVERY_RUNNING
,
5806 &mddev
->recovery
)));
5807 mddev_lock_nointr(mddev
);
5809 mutex_lock(&mddev
->open_mutex
);
5810 if ((mddev
->pers
&& atomic_read(&mddev
->openers
) > !!bdev
) ||
5811 mddev
->sysfs_active
||
5812 mddev
->sync_thread
||
5813 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
)) {
5814 pr_warn("md: %s still in use.\n",mdname(mddev
));
5815 mutex_unlock(&mddev
->open_mutex
);
5817 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5818 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5819 md_wakeup_thread(mddev
->thread
);
5825 set_disk_ro(disk
, 0);
5827 __md_stop_writes(mddev
);
5829 mddev
->queue
->backing_dev_info
->congested_fn
= NULL
;
5831 /* tell userspace to handle 'inactive' */
5832 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5834 rdev_for_each(rdev
, mddev
)
5835 if (rdev
->raid_disk
>= 0)
5836 sysfs_unlink_rdev(mddev
, rdev
);
5838 set_capacity(disk
, 0);
5839 mutex_unlock(&mddev
->open_mutex
);
5841 revalidate_disk(disk
);
5846 mutex_unlock(&mddev
->open_mutex
);
5848 * Free resources if final stop
5851 pr_info("md: %s stopped.\n", mdname(mddev
));
5853 if (mddev
->bitmap_info
.file
) {
5854 struct file
*f
= mddev
->bitmap_info
.file
;
5855 spin_lock(&mddev
->lock
);
5856 mddev
->bitmap_info
.file
= NULL
;
5857 spin_unlock(&mddev
->lock
);
5860 mddev
->bitmap_info
.offset
= 0;
5862 export_array(mddev
);
5865 if (mddev
->hold_active
== UNTIL_STOP
)
5866 mddev
->hold_active
= 0;
5868 md_new_event(mddev
);
5869 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5874 static void autorun_array(struct mddev
*mddev
)
5876 struct md_rdev
*rdev
;
5879 if (list_empty(&mddev
->disks
))
5882 pr_info("md: running: ");
5884 rdev_for_each(rdev
, mddev
) {
5885 char b
[BDEVNAME_SIZE
];
5886 pr_cont("<%s>", bdevname(rdev
->bdev
,b
));
5890 err
= do_md_run(mddev
);
5892 pr_warn("md: do_md_run() returned %d\n", err
);
5893 do_md_stop(mddev
, 0, NULL
);
5898 * lets try to run arrays based on all disks that have arrived
5899 * until now. (those are in pending_raid_disks)
5901 * the method: pick the first pending disk, collect all disks with
5902 * the same UUID, remove all from the pending list and put them into
5903 * the 'same_array' list. Then order this list based on superblock
5904 * update time (freshest comes first), kick out 'old' disks and
5905 * compare superblocks. If everything's fine then run it.
5907 * If "unit" is allocated, then bump its reference count
5909 static void autorun_devices(int part
)
5911 struct md_rdev
*rdev0
, *rdev
, *tmp
;
5912 struct mddev
*mddev
;
5913 char b
[BDEVNAME_SIZE
];
5915 pr_info("md: autorun ...\n");
5916 while (!list_empty(&pending_raid_disks
)) {
5919 LIST_HEAD(candidates
);
5920 rdev0
= list_entry(pending_raid_disks
.next
,
5921 struct md_rdev
, same_set
);
5923 pr_debug("md: considering %s ...\n", bdevname(rdev0
->bdev
,b
));
5924 INIT_LIST_HEAD(&candidates
);
5925 rdev_for_each_list(rdev
, tmp
, &pending_raid_disks
)
5926 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
5927 pr_debug("md: adding %s ...\n",
5928 bdevname(rdev
->bdev
,b
));
5929 list_move(&rdev
->same_set
, &candidates
);
5932 * now we have a set of devices, with all of them having
5933 * mostly sane superblocks. It's time to allocate the
5937 dev
= MKDEV(mdp_major
,
5938 rdev0
->preferred_minor
<< MdpMinorShift
);
5939 unit
= MINOR(dev
) >> MdpMinorShift
;
5941 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
5944 if (rdev0
->preferred_minor
!= unit
) {
5945 pr_warn("md: unit number in %s is bad: %d\n",
5946 bdevname(rdev0
->bdev
, b
), rdev0
->preferred_minor
);
5950 md_probe(dev
, NULL
, NULL
);
5951 mddev
= mddev_find(dev
);
5952 if (!mddev
|| !mddev
->gendisk
) {
5957 if (mddev_lock(mddev
))
5958 pr_warn("md: %s locked, cannot run\n", mdname(mddev
));
5959 else if (mddev
->raid_disks
|| mddev
->major_version
5960 || !list_empty(&mddev
->disks
)) {
5961 pr_warn("md: %s already running, cannot run %s\n",
5962 mdname(mddev
), bdevname(rdev0
->bdev
,b
));
5963 mddev_unlock(mddev
);
5965 pr_debug("md: created %s\n", mdname(mddev
));
5966 mddev
->persistent
= 1;
5967 rdev_for_each_list(rdev
, tmp
, &candidates
) {
5968 list_del_init(&rdev
->same_set
);
5969 if (bind_rdev_to_array(rdev
, mddev
))
5972 autorun_array(mddev
);
5973 mddev_unlock(mddev
);
5975 /* on success, candidates will be empty, on error
5978 rdev_for_each_list(rdev
, tmp
, &candidates
) {
5979 list_del_init(&rdev
->same_set
);
5984 pr_info("md: ... autorun DONE.\n");
5986 #endif /* !MODULE */
5988 static int get_version(void __user
*arg
)
5992 ver
.major
= MD_MAJOR_VERSION
;
5993 ver
.minor
= MD_MINOR_VERSION
;
5994 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
5996 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
6002 static int get_array_info(struct mddev
*mddev
, void __user
*arg
)
6004 mdu_array_info_t info
;
6005 int nr
,working
,insync
,failed
,spare
;
6006 struct md_rdev
*rdev
;
6008 nr
= working
= insync
= failed
= spare
= 0;
6010 rdev_for_each_rcu(rdev
, mddev
) {
6012 if (test_bit(Faulty
, &rdev
->flags
))
6016 if (test_bit(In_sync
, &rdev
->flags
))
6018 else if (test_bit(Journal
, &rdev
->flags
))
6019 /* TODO: add journal count to md_u.h */
6027 info
.major_version
= mddev
->major_version
;
6028 info
.minor_version
= mddev
->minor_version
;
6029 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
6030 info
.ctime
= clamp_t(time64_t
, mddev
->ctime
, 0, U32_MAX
);
6031 info
.level
= mddev
->level
;
6032 info
.size
= mddev
->dev_sectors
/ 2;
6033 if (info
.size
!= mddev
->dev_sectors
/ 2) /* overflow */
6036 info
.raid_disks
= mddev
->raid_disks
;
6037 info
.md_minor
= mddev
->md_minor
;
6038 info
.not_persistent
= !mddev
->persistent
;
6040 info
.utime
= clamp_t(time64_t
, mddev
->utime
, 0, U32_MAX
);
6043 info
.state
= (1<<MD_SB_CLEAN
);
6044 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
6045 info
.state
|= (1<<MD_SB_BITMAP_PRESENT
);
6046 if (mddev_is_clustered(mddev
))
6047 info
.state
|= (1<<MD_SB_CLUSTERED
);
6048 info
.active_disks
= insync
;
6049 info
.working_disks
= working
;
6050 info
.failed_disks
= failed
;
6051 info
.spare_disks
= spare
;
6053 info
.layout
= mddev
->layout
;
6054 info
.chunk_size
= mddev
->chunk_sectors
<< 9;
6056 if (copy_to_user(arg
, &info
, sizeof(info
)))
6062 static int get_bitmap_file(struct mddev
*mddev
, void __user
* arg
)
6064 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
6068 file
= kzalloc(sizeof(*file
), GFP_NOIO
);
6073 spin_lock(&mddev
->lock
);
6074 /* bitmap enabled */
6075 if (mddev
->bitmap_info
.file
) {
6076 ptr
= file_path(mddev
->bitmap_info
.file
, file
->pathname
,
6077 sizeof(file
->pathname
));
6081 memmove(file
->pathname
, ptr
,
6082 sizeof(file
->pathname
)-(ptr
-file
->pathname
));
6084 spin_unlock(&mddev
->lock
);
6087 copy_to_user(arg
, file
, sizeof(*file
)))
6094 static int get_disk_info(struct mddev
*mddev
, void __user
* arg
)
6096 mdu_disk_info_t info
;
6097 struct md_rdev
*rdev
;
6099 if (copy_from_user(&info
, arg
, sizeof(info
)))
6103 rdev
= md_find_rdev_nr_rcu(mddev
, info
.number
);
6105 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
6106 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
6107 info
.raid_disk
= rdev
->raid_disk
;
6109 if (test_bit(Faulty
, &rdev
->flags
))
6110 info
.state
|= (1<<MD_DISK_FAULTY
);
6111 else if (test_bit(In_sync
, &rdev
->flags
)) {
6112 info
.state
|= (1<<MD_DISK_ACTIVE
);
6113 info
.state
|= (1<<MD_DISK_SYNC
);
6115 if (test_bit(Journal
, &rdev
->flags
))
6116 info
.state
|= (1<<MD_DISK_JOURNAL
);
6117 if (test_bit(WriteMostly
, &rdev
->flags
))
6118 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
6119 if (test_bit(FailFast
, &rdev
->flags
))
6120 info
.state
|= (1<<MD_DISK_FAILFAST
);
6122 info
.major
= info
.minor
= 0;
6123 info
.raid_disk
= -1;
6124 info
.state
= (1<<MD_DISK_REMOVED
);
6128 if (copy_to_user(arg
, &info
, sizeof(info
)))
6134 static int add_new_disk(struct mddev
*mddev
, mdu_disk_info_t
*info
)
6136 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
6137 struct md_rdev
*rdev
;
6138 dev_t dev
= MKDEV(info
->major
,info
->minor
);
6140 if (mddev_is_clustered(mddev
) &&
6141 !(info
->state
& ((1 << MD_DISK_CLUSTER_ADD
) | (1 << MD_DISK_CANDIDATE
)))) {
6142 pr_warn("%s: Cannot add to clustered mddev.\n",
6147 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
6150 if (!mddev
->raid_disks
) {
6152 /* expecting a device which has a superblock */
6153 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
6155 pr_warn("md: md_import_device returned %ld\n",
6157 return PTR_ERR(rdev
);
6159 if (!list_empty(&mddev
->disks
)) {
6160 struct md_rdev
*rdev0
6161 = list_entry(mddev
->disks
.next
,
6162 struct md_rdev
, same_set
);
6163 err
= super_types
[mddev
->major_version
]
6164 .load_super(rdev
, rdev0
, mddev
->minor_version
);
6166 pr_warn("md: %s has different UUID to %s\n",
6167 bdevname(rdev
->bdev
,b
),
6168 bdevname(rdev0
->bdev
,b2
));
6173 err
= bind_rdev_to_array(rdev
, mddev
);
6180 * add_new_disk can be used once the array is assembled
6181 * to add "hot spares". They must already have a superblock
6186 if (!mddev
->pers
->hot_add_disk
) {
6187 pr_warn("%s: personality does not support diskops!\n",
6191 if (mddev
->persistent
)
6192 rdev
= md_import_device(dev
, mddev
->major_version
,
6193 mddev
->minor_version
);
6195 rdev
= md_import_device(dev
, -1, -1);
6197 pr_warn("md: md_import_device returned %ld\n",
6199 return PTR_ERR(rdev
);
6201 /* set saved_raid_disk if appropriate */
6202 if (!mddev
->persistent
) {
6203 if (info
->state
& (1<<MD_DISK_SYNC
) &&
6204 info
->raid_disk
< mddev
->raid_disks
) {
6205 rdev
->raid_disk
= info
->raid_disk
;
6206 set_bit(In_sync
, &rdev
->flags
);
6207 clear_bit(Bitmap_sync
, &rdev
->flags
);
6209 rdev
->raid_disk
= -1;
6210 rdev
->saved_raid_disk
= rdev
->raid_disk
;
6212 super_types
[mddev
->major_version
].
6213 validate_super(mddev
, rdev
);
6214 if ((info
->state
& (1<<MD_DISK_SYNC
)) &&
6215 rdev
->raid_disk
!= info
->raid_disk
) {
6216 /* This was a hot-add request, but events doesn't
6217 * match, so reject it.
6223 clear_bit(In_sync
, &rdev
->flags
); /* just to be sure */
6224 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
6225 set_bit(WriteMostly
, &rdev
->flags
);
6227 clear_bit(WriteMostly
, &rdev
->flags
);
6228 if (info
->state
& (1<<MD_DISK_FAILFAST
))
6229 set_bit(FailFast
, &rdev
->flags
);
6231 clear_bit(FailFast
, &rdev
->flags
);
6233 if (info
->state
& (1<<MD_DISK_JOURNAL
)) {
6234 struct md_rdev
*rdev2
;
6235 bool has_journal
= false;
6237 /* make sure no existing journal disk */
6238 rdev_for_each(rdev2
, mddev
) {
6239 if (test_bit(Journal
, &rdev2
->flags
)) {
6248 set_bit(Journal
, &rdev
->flags
);
6251 * check whether the device shows up in other nodes
6253 if (mddev_is_clustered(mddev
)) {
6254 if (info
->state
& (1 << MD_DISK_CANDIDATE
))
6255 set_bit(Candidate
, &rdev
->flags
);
6256 else if (info
->state
& (1 << MD_DISK_CLUSTER_ADD
)) {
6257 /* --add initiated by this node */
6258 err
= md_cluster_ops
->add_new_disk(mddev
, rdev
);
6266 rdev
->raid_disk
= -1;
6267 err
= bind_rdev_to_array(rdev
, mddev
);
6272 if (mddev_is_clustered(mddev
)) {
6273 if (info
->state
& (1 << MD_DISK_CANDIDATE
)) {
6275 err
= md_cluster_ops
->new_disk_ack(mddev
,
6278 md_kick_rdev_from_array(rdev
);
6282 md_cluster_ops
->add_new_disk_cancel(mddev
);
6284 err
= add_bound_rdev(rdev
);
6288 err
= add_bound_rdev(rdev
);
6293 /* otherwise, add_new_disk is only allowed
6294 * for major_version==0 superblocks
6296 if (mddev
->major_version
!= 0) {
6297 pr_warn("%s: ADD_NEW_DISK not supported\n", mdname(mddev
));
6301 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
6303 rdev
= md_import_device(dev
, -1, 0);
6305 pr_warn("md: error, md_import_device() returned %ld\n",
6307 return PTR_ERR(rdev
);
6309 rdev
->desc_nr
= info
->number
;
6310 if (info
->raid_disk
< mddev
->raid_disks
)
6311 rdev
->raid_disk
= info
->raid_disk
;
6313 rdev
->raid_disk
= -1;
6315 if (rdev
->raid_disk
< mddev
->raid_disks
)
6316 if (info
->state
& (1<<MD_DISK_SYNC
))
6317 set_bit(In_sync
, &rdev
->flags
);
6319 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
6320 set_bit(WriteMostly
, &rdev
->flags
);
6321 if (info
->state
& (1<<MD_DISK_FAILFAST
))
6322 set_bit(FailFast
, &rdev
->flags
);
6324 if (!mddev
->persistent
) {
6325 pr_debug("md: nonpersistent superblock ...\n");
6326 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
6328 rdev
->sb_start
= calc_dev_sboffset(rdev
);
6329 rdev
->sectors
= rdev
->sb_start
;
6331 err
= bind_rdev_to_array(rdev
, mddev
);
6341 static int hot_remove_disk(struct mddev
*mddev
, dev_t dev
)
6343 char b
[BDEVNAME_SIZE
];
6344 struct md_rdev
*rdev
;
6346 rdev
= find_rdev(mddev
, dev
);
6350 if (rdev
->raid_disk
< 0)
6353 clear_bit(Blocked
, &rdev
->flags
);
6354 remove_and_add_spares(mddev
, rdev
);
6356 if (rdev
->raid_disk
>= 0)
6360 if (mddev_is_clustered(mddev
))
6361 md_cluster_ops
->remove_disk(mddev
, rdev
);
6363 md_kick_rdev_from_array(rdev
);
6364 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
6366 md_wakeup_thread(mddev
->thread
);
6368 md_update_sb(mddev
, 1);
6369 md_new_event(mddev
);
6373 pr_debug("md: cannot remove active disk %s from %s ...\n",
6374 bdevname(rdev
->bdev
,b
), mdname(mddev
));
6378 static int hot_add_disk(struct mddev
*mddev
, dev_t dev
)
6380 char b
[BDEVNAME_SIZE
];
6382 struct md_rdev
*rdev
;
6387 if (mddev
->major_version
!= 0) {
6388 pr_warn("%s: HOT_ADD may only be used with version-0 superblocks.\n",
6392 if (!mddev
->pers
->hot_add_disk
) {
6393 pr_warn("%s: personality does not support diskops!\n",
6398 rdev
= md_import_device(dev
, -1, 0);
6400 pr_warn("md: error, md_import_device() returned %ld\n",
6405 if (mddev
->persistent
)
6406 rdev
->sb_start
= calc_dev_sboffset(rdev
);
6408 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
6410 rdev
->sectors
= rdev
->sb_start
;
6412 if (test_bit(Faulty
, &rdev
->flags
)) {
6413 pr_warn("md: can not hot-add faulty %s disk to %s!\n",
6414 bdevname(rdev
->bdev
,b
), mdname(mddev
));
6419 clear_bit(In_sync
, &rdev
->flags
);
6421 rdev
->saved_raid_disk
= -1;
6422 err
= bind_rdev_to_array(rdev
, mddev
);
6427 * The rest should better be atomic, we can have disk failures
6428 * noticed in interrupt contexts ...
6431 rdev
->raid_disk
= -1;
6433 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
6435 md_update_sb(mddev
, 1);
6437 * Kick recovery, maybe this spare has to be added to the
6438 * array immediately.
6440 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6441 md_wakeup_thread(mddev
->thread
);
6442 md_new_event(mddev
);
6450 static int set_bitmap_file(struct mddev
*mddev
, int fd
)
6455 if (!mddev
->pers
->quiesce
|| !mddev
->thread
)
6457 if (mddev
->recovery
|| mddev
->sync_thread
)
6459 /* we should be able to change the bitmap.. */
6463 struct inode
*inode
;
6466 if (mddev
->bitmap
|| mddev
->bitmap_info
.file
)
6467 return -EEXIST
; /* cannot add when bitmap is present */
6471 pr_warn("%s: error: failed to get bitmap file\n",
6476 inode
= f
->f_mapping
->host
;
6477 if (!S_ISREG(inode
->i_mode
)) {
6478 pr_warn("%s: error: bitmap file must be a regular file\n",
6481 } else if (!(f
->f_mode
& FMODE_WRITE
)) {
6482 pr_warn("%s: error: bitmap file must open for write\n",
6485 } else if (atomic_read(&inode
->i_writecount
) != 1) {
6486 pr_warn("%s: error: bitmap file is already in use\n",
6494 mddev
->bitmap_info
.file
= f
;
6495 mddev
->bitmap_info
.offset
= 0; /* file overrides offset */
6496 } else if (mddev
->bitmap
== NULL
)
6497 return -ENOENT
; /* cannot remove what isn't there */
6500 mddev
->pers
->quiesce(mddev
, 1);
6502 struct bitmap
*bitmap
;
6504 bitmap
= bitmap_create(mddev
, -1);
6505 if (!IS_ERR(bitmap
)) {
6506 mddev
->bitmap
= bitmap
;
6507 err
= bitmap_load(mddev
);
6509 err
= PTR_ERR(bitmap
);
6511 if (fd
< 0 || err
) {
6512 bitmap_destroy(mddev
);
6513 fd
= -1; /* make sure to put the file */
6515 mddev
->pers
->quiesce(mddev
, 0);
6518 struct file
*f
= mddev
->bitmap_info
.file
;
6520 spin_lock(&mddev
->lock
);
6521 mddev
->bitmap_info
.file
= NULL
;
6522 spin_unlock(&mddev
->lock
);
6531 * set_array_info is used two different ways
6532 * The original usage is when creating a new array.
6533 * In this usage, raid_disks is > 0 and it together with
6534 * level, size, not_persistent,layout,chunksize determine the
6535 * shape of the array.
6536 * This will always create an array with a type-0.90.0 superblock.
6537 * The newer usage is when assembling an array.
6538 * In this case raid_disks will be 0, and the major_version field is
6539 * use to determine which style super-blocks are to be found on the devices.
6540 * The minor and patch _version numbers are also kept incase the
6541 * super_block handler wishes to interpret them.
6543 static int set_array_info(struct mddev
*mddev
, mdu_array_info_t
*info
)
6546 if (info
->raid_disks
== 0) {
6547 /* just setting version number for superblock loading */
6548 if (info
->major_version
< 0 ||
6549 info
->major_version
>= ARRAY_SIZE(super_types
) ||
6550 super_types
[info
->major_version
].name
== NULL
) {
6551 /* maybe try to auto-load a module? */
6552 pr_warn("md: superblock version %d not known\n",
6553 info
->major_version
);
6556 mddev
->major_version
= info
->major_version
;
6557 mddev
->minor_version
= info
->minor_version
;
6558 mddev
->patch_version
= info
->patch_version
;
6559 mddev
->persistent
= !info
->not_persistent
;
6560 /* ensure mddev_put doesn't delete this now that there
6561 * is some minimal configuration.
6563 mddev
->ctime
= ktime_get_real_seconds();
6566 mddev
->major_version
= MD_MAJOR_VERSION
;
6567 mddev
->minor_version
= MD_MINOR_VERSION
;
6568 mddev
->patch_version
= MD_PATCHLEVEL_VERSION
;
6569 mddev
->ctime
= ktime_get_real_seconds();
6571 mddev
->level
= info
->level
;
6572 mddev
->clevel
[0] = 0;
6573 mddev
->dev_sectors
= 2 * (sector_t
)info
->size
;
6574 mddev
->raid_disks
= info
->raid_disks
;
6575 /* don't set md_minor, it is determined by which /dev/md* was
6578 if (info
->state
& (1<<MD_SB_CLEAN
))
6579 mddev
->recovery_cp
= MaxSector
;
6581 mddev
->recovery_cp
= 0;
6582 mddev
->persistent
= ! info
->not_persistent
;
6583 mddev
->external
= 0;
6585 mddev
->layout
= info
->layout
;
6586 mddev
->chunk_sectors
= info
->chunk_size
>> 9;
6588 if (mddev
->persistent
) {
6589 mddev
->max_disks
= MD_SB_DISKS
;
6591 mddev
->sb_flags
= 0;
6593 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
6595 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
6596 mddev
->bitmap_info
.default_space
= 64*2 - (MD_SB_BYTES
>> 9);
6597 mddev
->bitmap_info
.offset
= 0;
6599 mddev
->reshape_position
= MaxSector
;
6602 * Generate a 128 bit UUID
6604 get_random_bytes(mddev
->uuid
, 16);
6606 mddev
->new_level
= mddev
->level
;
6607 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
6608 mddev
->new_layout
= mddev
->layout
;
6609 mddev
->delta_disks
= 0;
6610 mddev
->reshape_backwards
= 0;
6615 void md_set_array_sectors(struct mddev
*mddev
, sector_t array_sectors
)
6617 WARN(!mddev_is_locked(mddev
), "%s: unlocked mddev!\n", __func__
);
6619 if (mddev
->external_size
)
6622 mddev
->array_sectors
= array_sectors
;
6624 EXPORT_SYMBOL(md_set_array_sectors
);
6626 static int update_size(struct mddev
*mddev
, sector_t num_sectors
)
6628 struct md_rdev
*rdev
;
6630 int fit
= (num_sectors
== 0);
6631 sector_t old_dev_sectors
= mddev
->dev_sectors
;
6633 if (mddev
->pers
->resize
== NULL
)
6635 /* The "num_sectors" is the number of sectors of each device that
6636 * is used. This can only make sense for arrays with redundancy.
6637 * linear and raid0 always use whatever space is available. We can only
6638 * consider changing this number if no resync or reconstruction is
6639 * happening, and if the new size is acceptable. It must fit before the
6640 * sb_start or, if that is <data_offset, it must fit before the size
6641 * of each device. If num_sectors is zero, we find the largest size
6644 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
6650 rdev_for_each(rdev
, mddev
) {
6651 sector_t avail
= rdev
->sectors
;
6653 if (fit
&& (num_sectors
== 0 || num_sectors
> avail
))
6654 num_sectors
= avail
;
6655 if (avail
< num_sectors
)
6658 rv
= mddev
->pers
->resize(mddev
, num_sectors
);
6660 if (mddev_is_clustered(mddev
))
6661 md_cluster_ops
->update_size(mddev
, old_dev_sectors
);
6662 else if (mddev
->queue
) {
6663 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
6664 revalidate_disk(mddev
->gendisk
);
6670 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
)
6673 struct md_rdev
*rdev
;
6674 /* change the number of raid disks */
6675 if (mddev
->pers
->check_reshape
== NULL
)
6679 if (raid_disks
<= 0 ||
6680 (mddev
->max_disks
&& raid_disks
>= mddev
->max_disks
))
6682 if (mddev
->sync_thread
||
6683 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
6684 mddev
->reshape_position
!= MaxSector
)
6687 rdev_for_each(rdev
, mddev
) {
6688 if (mddev
->raid_disks
< raid_disks
&&
6689 rdev
->data_offset
< rdev
->new_data_offset
)
6691 if (mddev
->raid_disks
> raid_disks
&&
6692 rdev
->data_offset
> rdev
->new_data_offset
)
6696 mddev
->delta_disks
= raid_disks
- mddev
->raid_disks
;
6697 if (mddev
->delta_disks
< 0)
6698 mddev
->reshape_backwards
= 1;
6699 else if (mddev
->delta_disks
> 0)
6700 mddev
->reshape_backwards
= 0;
6702 rv
= mddev
->pers
->check_reshape(mddev
);
6704 mddev
->delta_disks
= 0;
6705 mddev
->reshape_backwards
= 0;
6711 * update_array_info is used to change the configuration of an
6713 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
6714 * fields in the info are checked against the array.
6715 * Any differences that cannot be handled will cause an error.
6716 * Normally, only one change can be managed at a time.
6718 static int update_array_info(struct mddev
*mddev
, mdu_array_info_t
*info
)
6724 /* calculate expected state,ignoring low bits */
6725 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
6726 state
|= (1 << MD_SB_BITMAP_PRESENT
);
6728 if (mddev
->major_version
!= info
->major_version
||
6729 mddev
->minor_version
!= info
->minor_version
||
6730 /* mddev->patch_version != info->patch_version || */
6731 mddev
->ctime
!= info
->ctime
||
6732 mddev
->level
!= info
->level
||
6733 /* mddev->layout != info->layout || */
6734 mddev
->persistent
!= !info
->not_persistent
||
6735 mddev
->chunk_sectors
!= info
->chunk_size
>> 9 ||
6736 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
6737 ((state
^info
->state
) & 0xfffffe00)
6740 /* Check there is only one change */
6741 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
6743 if (mddev
->raid_disks
!= info
->raid_disks
)
6745 if (mddev
->layout
!= info
->layout
)
6747 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
))
6754 if (mddev
->layout
!= info
->layout
) {
6756 * we don't need to do anything at the md level, the
6757 * personality will take care of it all.
6759 if (mddev
->pers
->check_reshape
== NULL
)
6762 mddev
->new_layout
= info
->layout
;
6763 rv
= mddev
->pers
->check_reshape(mddev
);
6765 mddev
->new_layout
= mddev
->layout
;
6769 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
6770 rv
= update_size(mddev
, (sector_t
)info
->size
* 2);
6772 if (mddev
->raid_disks
!= info
->raid_disks
)
6773 rv
= update_raid_disks(mddev
, info
->raid_disks
);
6775 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) {
6776 if (mddev
->pers
->quiesce
== NULL
|| mddev
->thread
== NULL
) {
6780 if (mddev
->recovery
|| mddev
->sync_thread
) {
6784 if (info
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
6785 struct bitmap
*bitmap
;
6786 /* add the bitmap */
6787 if (mddev
->bitmap
) {
6791 if (mddev
->bitmap_info
.default_offset
== 0) {
6795 mddev
->bitmap_info
.offset
=
6796 mddev
->bitmap_info
.default_offset
;
6797 mddev
->bitmap_info
.space
=
6798 mddev
->bitmap_info
.default_space
;
6799 mddev
->pers
->quiesce(mddev
, 1);
6800 bitmap
= bitmap_create(mddev
, -1);
6801 if (!IS_ERR(bitmap
)) {
6802 mddev
->bitmap
= bitmap
;
6803 rv
= bitmap_load(mddev
);
6805 rv
= PTR_ERR(bitmap
);
6807 bitmap_destroy(mddev
);
6808 mddev
->pers
->quiesce(mddev
, 0);
6810 /* remove the bitmap */
6811 if (!mddev
->bitmap
) {
6815 if (mddev
->bitmap
->storage
.file
) {
6819 if (mddev
->bitmap_info
.nodes
) {
6820 /* hold PW on all the bitmap lock */
6821 if (md_cluster_ops
->lock_all_bitmaps(mddev
) <= 0) {
6822 pr_warn("md: can't change bitmap to none since the array is in use by more than one node\n");
6824 md_cluster_ops
->unlock_all_bitmaps(mddev
);
6828 mddev
->bitmap_info
.nodes
= 0;
6829 md_cluster_ops
->leave(mddev
);
6831 mddev
->pers
->quiesce(mddev
, 1);
6832 bitmap_destroy(mddev
);
6833 mddev
->pers
->quiesce(mddev
, 0);
6834 mddev
->bitmap_info
.offset
= 0;
6837 md_update_sb(mddev
, 1);
6843 static int set_disk_faulty(struct mddev
*mddev
, dev_t dev
)
6845 struct md_rdev
*rdev
;
6848 if (mddev
->pers
== NULL
)
6852 rdev
= find_rdev_rcu(mddev
, dev
);
6856 md_error(mddev
, rdev
);
6857 if (!test_bit(Faulty
, &rdev
->flags
))
6865 * We have a problem here : there is no easy way to give a CHS
6866 * virtual geometry. We currently pretend that we have a 2 heads
6867 * 4 sectors (with a BIG number of cylinders...). This drives
6868 * dosfs just mad... ;-)
6870 static int md_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
6872 struct mddev
*mddev
= bdev
->bd_disk
->private_data
;
6876 geo
->cylinders
= mddev
->array_sectors
/ 8;
6880 static inline bool md_ioctl_valid(unsigned int cmd
)
6885 case GET_ARRAY_INFO
:
6886 case GET_BITMAP_FILE
:
6889 case HOT_REMOVE_DISK
:
6892 case RESTART_ARRAY_RW
:
6894 case SET_ARRAY_INFO
:
6895 case SET_BITMAP_FILE
:
6896 case SET_DISK_FAULTY
:
6899 case CLUSTERED_DISK_NACK
:
6906 static int md_ioctl(struct block_device
*bdev
, fmode_t mode
,
6907 unsigned int cmd
, unsigned long arg
)
6910 void __user
*argp
= (void __user
*)arg
;
6911 struct mddev
*mddev
= NULL
;
6914 if (!md_ioctl_valid(cmd
))
6919 case GET_ARRAY_INFO
:
6923 if (!capable(CAP_SYS_ADMIN
))
6928 * Commands dealing with the RAID driver but not any
6933 err
= get_version(argp
);
6939 autostart_arrays(arg
);
6946 * Commands creating/starting a new array:
6949 mddev
= bdev
->bd_disk
->private_data
;
6956 /* Some actions do not requires the mutex */
6958 case GET_ARRAY_INFO
:
6959 if (!mddev
->raid_disks
&& !mddev
->external
)
6962 err
= get_array_info(mddev
, argp
);
6966 if (!mddev
->raid_disks
&& !mddev
->external
)
6969 err
= get_disk_info(mddev
, argp
);
6972 case SET_DISK_FAULTY
:
6973 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
6976 case GET_BITMAP_FILE
:
6977 err
= get_bitmap_file(mddev
, argp
);
6982 if (cmd
== ADD_NEW_DISK
)
6983 /* need to ensure md_delayed_delete() has completed */
6984 flush_workqueue(md_misc_wq
);
6986 if (cmd
== HOT_REMOVE_DISK
)
6987 /* need to ensure recovery thread has run */
6988 wait_event_interruptible_timeout(mddev
->sb_wait
,
6989 !test_bit(MD_RECOVERY_NEEDED
,
6991 msecs_to_jiffies(5000));
6992 if (cmd
== STOP_ARRAY
|| cmd
== STOP_ARRAY_RO
) {
6993 /* Need to flush page cache, and ensure no-one else opens
6996 mutex_lock(&mddev
->open_mutex
);
6997 if (mddev
->pers
&& atomic_read(&mddev
->openers
) > 1) {
6998 mutex_unlock(&mddev
->open_mutex
);
7002 set_bit(MD_CLOSING
, &mddev
->flags
);
7003 mutex_unlock(&mddev
->open_mutex
);
7004 sync_blockdev(bdev
);
7006 err
= mddev_lock(mddev
);
7008 pr_debug("md: ioctl lock interrupted, reason %d, cmd %d\n",
7013 if (cmd
== SET_ARRAY_INFO
) {
7014 mdu_array_info_t info
;
7016 memset(&info
, 0, sizeof(info
));
7017 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
7022 err
= update_array_info(mddev
, &info
);
7024 pr_warn("md: couldn't update array info. %d\n", err
);
7029 if (!list_empty(&mddev
->disks
)) {
7030 pr_warn("md: array %s already has disks!\n", mdname(mddev
));
7034 if (mddev
->raid_disks
) {
7035 pr_warn("md: array %s already initialised!\n", mdname(mddev
));
7039 err
= set_array_info(mddev
, &info
);
7041 pr_warn("md: couldn't set array info. %d\n", err
);
7048 * Commands querying/configuring an existing array:
7050 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
7051 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
7052 if ((!mddev
->raid_disks
&& !mddev
->external
)
7053 && cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
7054 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
7055 && cmd
!= GET_BITMAP_FILE
) {
7061 * Commands even a read-only array can execute:
7064 case RESTART_ARRAY_RW
:
7065 err
= restart_array(mddev
);
7069 err
= do_md_stop(mddev
, 0, bdev
);
7073 err
= md_set_readonly(mddev
, bdev
);
7076 case HOT_REMOVE_DISK
:
7077 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
7081 /* We can support ADD_NEW_DISK on read-only arrays
7082 * only if we are re-adding a preexisting device.
7083 * So require mddev->pers and MD_DISK_SYNC.
7086 mdu_disk_info_t info
;
7087 if (copy_from_user(&info
, argp
, sizeof(info
)))
7089 else if (!(info
.state
& (1<<MD_DISK_SYNC
)))
7090 /* Need to clear read-only for this */
7093 err
= add_new_disk(mddev
, &info
);
7099 if (get_user(ro
, (int __user
*)(arg
))) {
7105 /* if the bdev is going readonly the value of mddev->ro
7106 * does not matter, no writes are coming
7111 /* are we are already prepared for writes? */
7115 /* transitioning to readauto need only happen for
7116 * arrays that call md_write_start
7119 err
= restart_array(mddev
);
7122 set_disk_ro(mddev
->gendisk
, 0);
7129 * The remaining ioctls are changing the state of the
7130 * superblock, so we do not allow them on read-only arrays.
7132 if (mddev
->ro
&& mddev
->pers
) {
7133 if (mddev
->ro
== 2) {
7135 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7136 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7137 /* mddev_unlock will wake thread */
7138 /* If a device failed while we were read-only, we
7139 * need to make sure the metadata is updated now.
7141 if (test_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
)) {
7142 mddev_unlock(mddev
);
7143 wait_event(mddev
->sb_wait
,
7144 !test_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
) &&
7145 !test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
));
7146 mddev_lock_nointr(mddev
);
7157 mdu_disk_info_t info
;
7158 if (copy_from_user(&info
, argp
, sizeof(info
)))
7161 err
= add_new_disk(mddev
, &info
);
7165 case CLUSTERED_DISK_NACK
:
7166 if (mddev_is_clustered(mddev
))
7167 md_cluster_ops
->new_disk_ack(mddev
, false);
7173 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
7177 err
= do_md_run(mddev
);
7180 case SET_BITMAP_FILE
:
7181 err
= set_bitmap_file(mddev
, (int)arg
);
7190 if (mddev
->hold_active
== UNTIL_IOCTL
&&
7192 mddev
->hold_active
= 0;
7193 mddev_unlock(mddev
);
7197 #ifdef CONFIG_COMPAT
7198 static int md_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
7199 unsigned int cmd
, unsigned long arg
)
7202 case HOT_REMOVE_DISK
:
7204 case SET_DISK_FAULTY
:
7205 case SET_BITMAP_FILE
:
7206 /* These take in integer arg, do not convert */
7209 arg
= (unsigned long)compat_ptr(arg
);
7213 return md_ioctl(bdev
, mode
, cmd
, arg
);
7215 #endif /* CONFIG_COMPAT */
7217 static int md_open(struct block_device
*bdev
, fmode_t mode
)
7220 * Succeed if we can lock the mddev, which confirms that
7221 * it isn't being stopped right now.
7223 struct mddev
*mddev
= mddev_find(bdev
->bd_dev
);
7229 if (mddev
->gendisk
!= bdev
->bd_disk
) {
7230 /* we are racing with mddev_put which is discarding this
7234 /* Wait until bdev->bd_disk is definitely gone */
7235 flush_workqueue(md_misc_wq
);
7236 /* Then retry the open from the top */
7237 return -ERESTARTSYS
;
7239 BUG_ON(mddev
!= bdev
->bd_disk
->private_data
);
7241 if ((err
= mutex_lock_interruptible(&mddev
->open_mutex
)))
7244 if (test_bit(MD_CLOSING
, &mddev
->flags
)) {
7245 mutex_unlock(&mddev
->open_mutex
);
7251 atomic_inc(&mddev
->openers
);
7252 mutex_unlock(&mddev
->open_mutex
);
7254 check_disk_change(bdev
);
7261 static void md_release(struct gendisk
*disk
, fmode_t mode
)
7263 struct mddev
*mddev
= disk
->private_data
;
7266 atomic_dec(&mddev
->openers
);
7270 static int md_media_changed(struct gendisk
*disk
)
7272 struct mddev
*mddev
= disk
->private_data
;
7274 return mddev
->changed
;
7277 static int md_revalidate(struct gendisk
*disk
)
7279 struct mddev
*mddev
= disk
->private_data
;
7284 static const struct block_device_operations md_fops
=
7286 .owner
= THIS_MODULE
,
7288 .release
= md_release
,
7290 #ifdef CONFIG_COMPAT
7291 .compat_ioctl
= md_compat_ioctl
,
7293 .getgeo
= md_getgeo
,
7294 .media_changed
= md_media_changed
,
7295 .revalidate_disk
= md_revalidate
,
7298 static int md_thread(void *arg
)
7300 struct md_thread
*thread
= arg
;
7303 * md_thread is a 'system-thread', it's priority should be very
7304 * high. We avoid resource deadlocks individually in each
7305 * raid personality. (RAID5 does preallocation) We also use RR and
7306 * the very same RT priority as kswapd, thus we will never get
7307 * into a priority inversion deadlock.
7309 * we definitely have to have equal or higher priority than
7310 * bdflush, otherwise bdflush will deadlock if there are too
7311 * many dirty RAID5 blocks.
7314 allow_signal(SIGKILL
);
7315 while (!kthread_should_stop()) {
7317 /* We need to wait INTERRUPTIBLE so that
7318 * we don't add to the load-average.
7319 * That means we need to be sure no signals are
7322 if (signal_pending(current
))
7323 flush_signals(current
);
7325 wait_event_interruptible_timeout
7327 test_bit(THREAD_WAKEUP
, &thread
->flags
)
7328 || kthread_should_stop() || kthread_should_park(),
7331 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
7332 if (kthread_should_park())
7334 if (!kthread_should_stop())
7335 thread
->run(thread
);
7341 void md_wakeup_thread(struct md_thread
*thread
)
7344 pr_debug("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
7345 set_bit(THREAD_WAKEUP
, &thread
->flags
);
7346 wake_up(&thread
->wqueue
);
7349 EXPORT_SYMBOL(md_wakeup_thread
);
7351 struct md_thread
*md_register_thread(void (*run
) (struct md_thread
*),
7352 struct mddev
*mddev
, const char *name
)
7354 struct md_thread
*thread
;
7356 thread
= kzalloc(sizeof(struct md_thread
), GFP_KERNEL
);
7360 init_waitqueue_head(&thread
->wqueue
);
7363 thread
->mddev
= mddev
;
7364 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
7365 thread
->tsk
= kthread_run(md_thread
, thread
,
7367 mdname(thread
->mddev
),
7369 if (IS_ERR(thread
->tsk
)) {
7375 EXPORT_SYMBOL(md_register_thread
);
7377 void md_unregister_thread(struct md_thread
**threadp
)
7379 struct md_thread
*thread
= *threadp
;
7382 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread
->tsk
));
7383 /* Locking ensures that mddev_unlock does not wake_up a
7384 * non-existent thread
7386 spin_lock(&pers_lock
);
7388 spin_unlock(&pers_lock
);
7390 kthread_stop(thread
->tsk
);
7393 EXPORT_SYMBOL(md_unregister_thread
);
7395 void md_error(struct mddev
*mddev
, struct md_rdev
*rdev
)
7397 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
7400 if (!mddev
->pers
|| !mddev
->pers
->error_handler
)
7402 mddev
->pers
->error_handler(mddev
,rdev
);
7403 if (mddev
->degraded
)
7404 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7405 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
7406 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7407 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7408 md_wakeup_thread(mddev
->thread
);
7409 if (mddev
->event_work
.func
)
7410 queue_work(md_misc_wq
, &mddev
->event_work
);
7411 md_new_event(mddev
);
7413 EXPORT_SYMBOL(md_error
);
7415 /* seq_file implementation /proc/mdstat */
7417 static void status_unused(struct seq_file
*seq
)
7420 struct md_rdev
*rdev
;
7422 seq_printf(seq
, "unused devices: ");
7424 list_for_each_entry(rdev
, &pending_raid_disks
, same_set
) {
7425 char b
[BDEVNAME_SIZE
];
7427 seq_printf(seq
, "%s ",
7428 bdevname(rdev
->bdev
,b
));
7431 seq_printf(seq
, "<none>");
7433 seq_printf(seq
, "\n");
7436 static int status_resync(struct seq_file
*seq
, struct mddev
*mddev
)
7438 sector_t max_sectors
, resync
, res
;
7439 unsigned long dt
, db
;
7442 unsigned int per_milli
;
7444 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
7445 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
7446 max_sectors
= mddev
->resync_max_sectors
;
7448 max_sectors
= mddev
->dev_sectors
;
7450 resync
= mddev
->curr_resync
;
7452 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
7453 /* Still cleaning up */
7454 resync
= max_sectors
;
7456 resync
-= atomic_read(&mddev
->recovery_active
);
7459 if (mddev
->recovery_cp
< MaxSector
) {
7460 seq_printf(seq
, "\tresync=PENDING");
7466 seq_printf(seq
, "\tresync=DELAYED");
7470 WARN_ON(max_sectors
== 0);
7471 /* Pick 'scale' such that (resync>>scale)*1000 will fit
7472 * in a sector_t, and (max_sectors>>scale) will fit in a
7473 * u32, as those are the requirements for sector_div.
7474 * Thus 'scale' must be at least 10
7477 if (sizeof(sector_t
) > sizeof(unsigned long)) {
7478 while ( max_sectors
/2 > (1ULL<<(scale
+32)))
7481 res
= (resync
>>scale
)*1000;
7482 sector_div(res
, (u32
)((max_sectors
>>scale
)+1));
7486 int i
, x
= per_milli
/50, y
= 20-x
;
7487 seq_printf(seq
, "[");
7488 for (i
= 0; i
< x
; i
++)
7489 seq_printf(seq
, "=");
7490 seq_printf(seq
, ">");
7491 for (i
= 0; i
< y
; i
++)
7492 seq_printf(seq
, ".");
7493 seq_printf(seq
, "] ");
7495 seq_printf(seq
, " %s =%3u.%u%% (%llu/%llu)",
7496 (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)?
7498 (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)?
7500 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
7501 "resync" : "recovery"))),
7502 per_milli
/10, per_milli
% 10,
7503 (unsigned long long) resync
/2,
7504 (unsigned long long) max_sectors
/2);
7507 * dt: time from mark until now
7508 * db: blocks written from mark until now
7509 * rt: remaining time
7511 * rt is a sector_t, so could be 32bit or 64bit.
7512 * So we divide before multiply in case it is 32bit and close
7514 * We scale the divisor (db) by 32 to avoid losing precision
7515 * near the end of resync when the number of remaining sectors
7517 * We then divide rt by 32 after multiplying by db to compensate.
7518 * The '+1' avoids division by zero if db is very small.
7520 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
7522 db
= (mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
))
7523 - mddev
->resync_mark_cnt
;
7525 rt
= max_sectors
- resync
; /* number of remaining sectors */
7526 sector_div(rt
, db
/32+1);
7530 seq_printf(seq
, " finish=%lu.%lumin", (unsigned long)rt
/ 60,
7531 ((unsigned long)rt
% 60)/6);
7533 seq_printf(seq
, " speed=%ldK/sec", db
/2/dt
);
7537 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
7539 struct list_head
*tmp
;
7541 struct mddev
*mddev
;
7549 spin_lock(&all_mddevs_lock
);
7550 list_for_each(tmp
,&all_mddevs
)
7552 mddev
= list_entry(tmp
, struct mddev
, all_mddevs
);
7554 spin_unlock(&all_mddevs_lock
);
7557 spin_unlock(&all_mddevs_lock
);
7559 return (void*)2;/* tail */
7563 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
7565 struct list_head
*tmp
;
7566 struct mddev
*next_mddev
, *mddev
= v
;
7572 spin_lock(&all_mddevs_lock
);
7574 tmp
= all_mddevs
.next
;
7576 tmp
= mddev
->all_mddevs
.next
;
7577 if (tmp
!= &all_mddevs
)
7578 next_mddev
= mddev_get(list_entry(tmp
,struct mddev
,all_mddevs
));
7580 next_mddev
= (void*)2;
7583 spin_unlock(&all_mddevs_lock
);
7591 static void md_seq_stop(struct seq_file
*seq
, void *v
)
7593 struct mddev
*mddev
= v
;
7595 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
7599 static int md_seq_show(struct seq_file
*seq
, void *v
)
7601 struct mddev
*mddev
= v
;
7603 struct md_rdev
*rdev
;
7605 if (v
== (void*)1) {
7606 struct md_personality
*pers
;
7607 seq_printf(seq
, "Personalities : ");
7608 spin_lock(&pers_lock
);
7609 list_for_each_entry(pers
, &pers_list
, list
)
7610 seq_printf(seq
, "[%s] ", pers
->name
);
7612 spin_unlock(&pers_lock
);
7613 seq_printf(seq
, "\n");
7614 seq
->poll_event
= atomic_read(&md_event_count
);
7617 if (v
== (void*)2) {
7622 spin_lock(&mddev
->lock
);
7623 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
7624 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
7625 mddev
->pers
? "" : "in");
7628 seq_printf(seq
, " (read-only)");
7630 seq_printf(seq
, " (auto-read-only)");
7631 seq_printf(seq
, " %s", mddev
->pers
->name
);
7636 rdev_for_each_rcu(rdev
, mddev
) {
7637 char b
[BDEVNAME_SIZE
];
7638 seq_printf(seq
, " %s[%d]",
7639 bdevname(rdev
->bdev
,b
), rdev
->desc_nr
);
7640 if (test_bit(WriteMostly
, &rdev
->flags
))
7641 seq_printf(seq
, "(W)");
7642 if (test_bit(Journal
, &rdev
->flags
))
7643 seq_printf(seq
, "(J)");
7644 if (test_bit(Faulty
, &rdev
->flags
)) {
7645 seq_printf(seq
, "(F)");
7648 if (rdev
->raid_disk
< 0)
7649 seq_printf(seq
, "(S)"); /* spare */
7650 if (test_bit(Replacement
, &rdev
->flags
))
7651 seq_printf(seq
, "(R)");
7652 sectors
+= rdev
->sectors
;
7656 if (!list_empty(&mddev
->disks
)) {
7658 seq_printf(seq
, "\n %llu blocks",
7659 (unsigned long long)
7660 mddev
->array_sectors
/ 2);
7662 seq_printf(seq
, "\n %llu blocks",
7663 (unsigned long long)sectors
/ 2);
7665 if (mddev
->persistent
) {
7666 if (mddev
->major_version
!= 0 ||
7667 mddev
->minor_version
!= 90) {
7668 seq_printf(seq
," super %d.%d",
7669 mddev
->major_version
,
7670 mddev
->minor_version
);
7672 } else if (mddev
->external
)
7673 seq_printf(seq
, " super external:%s",
7674 mddev
->metadata_type
);
7676 seq_printf(seq
, " super non-persistent");
7679 mddev
->pers
->status(seq
, mddev
);
7680 seq_printf(seq
, "\n ");
7681 if (mddev
->pers
->sync_request
) {
7682 if (status_resync(seq
, mddev
))
7683 seq_printf(seq
, "\n ");
7686 seq_printf(seq
, "\n ");
7688 bitmap_status(seq
, mddev
->bitmap
);
7690 seq_printf(seq
, "\n");
7692 spin_unlock(&mddev
->lock
);
7697 static const struct seq_operations md_seq_ops
= {
7698 .start
= md_seq_start
,
7699 .next
= md_seq_next
,
7700 .stop
= md_seq_stop
,
7701 .show
= md_seq_show
,
7704 static int md_seq_open(struct inode
*inode
, struct file
*file
)
7706 struct seq_file
*seq
;
7709 error
= seq_open(file
, &md_seq_ops
);
7713 seq
= file
->private_data
;
7714 seq
->poll_event
= atomic_read(&md_event_count
);
7718 static int md_unloading
;
7719 static unsigned int mdstat_poll(struct file
*filp
, poll_table
*wait
)
7721 struct seq_file
*seq
= filp
->private_data
;
7725 return POLLIN
|POLLRDNORM
|POLLERR
|POLLPRI
;
7726 poll_wait(filp
, &md_event_waiters
, wait
);
7728 /* always allow read */
7729 mask
= POLLIN
| POLLRDNORM
;
7731 if (seq
->poll_event
!= atomic_read(&md_event_count
))
7732 mask
|= POLLERR
| POLLPRI
;
7736 static const struct file_operations md_seq_fops
= {
7737 .owner
= THIS_MODULE
,
7738 .open
= md_seq_open
,
7740 .llseek
= seq_lseek
,
7741 .release
= seq_release_private
,
7742 .poll
= mdstat_poll
,
7745 int register_md_personality(struct md_personality
*p
)
7747 pr_debug("md: %s personality registered for level %d\n",
7749 spin_lock(&pers_lock
);
7750 list_add_tail(&p
->list
, &pers_list
);
7751 spin_unlock(&pers_lock
);
7754 EXPORT_SYMBOL(register_md_personality
);
7756 int unregister_md_personality(struct md_personality
*p
)
7758 pr_debug("md: %s personality unregistered\n", p
->name
);
7759 spin_lock(&pers_lock
);
7760 list_del_init(&p
->list
);
7761 spin_unlock(&pers_lock
);
7764 EXPORT_SYMBOL(unregister_md_personality
);
7766 int register_md_cluster_operations(struct md_cluster_operations
*ops
,
7767 struct module
*module
)
7770 spin_lock(&pers_lock
);
7771 if (md_cluster_ops
!= NULL
)
7774 md_cluster_ops
= ops
;
7775 md_cluster_mod
= module
;
7777 spin_unlock(&pers_lock
);
7780 EXPORT_SYMBOL(register_md_cluster_operations
);
7782 int unregister_md_cluster_operations(void)
7784 spin_lock(&pers_lock
);
7785 md_cluster_ops
= NULL
;
7786 spin_unlock(&pers_lock
);
7789 EXPORT_SYMBOL(unregister_md_cluster_operations
);
7791 int md_setup_cluster(struct mddev
*mddev
, int nodes
)
7793 if (!md_cluster_ops
)
7794 request_module("md-cluster");
7795 spin_lock(&pers_lock
);
7796 /* ensure module won't be unloaded */
7797 if (!md_cluster_ops
|| !try_module_get(md_cluster_mod
)) {
7798 pr_warn("can't find md-cluster module or get it's reference.\n");
7799 spin_unlock(&pers_lock
);
7802 spin_unlock(&pers_lock
);
7804 return md_cluster_ops
->join(mddev
, nodes
);
7807 void md_cluster_stop(struct mddev
*mddev
)
7809 if (!md_cluster_ops
)
7811 md_cluster_ops
->leave(mddev
);
7812 module_put(md_cluster_mod
);
7815 static int is_mddev_idle(struct mddev
*mddev
, int init
)
7817 struct md_rdev
*rdev
;
7823 rdev_for_each_rcu(rdev
, mddev
) {
7824 struct gendisk
*disk
= rdev
->bdev
->bd_contains
->bd_disk
;
7825 curr_events
= (int)part_stat_read(&disk
->part0
, sectors
[0]) +
7826 (int)part_stat_read(&disk
->part0
, sectors
[1]) -
7827 atomic_read(&disk
->sync_io
);
7828 /* sync IO will cause sync_io to increase before the disk_stats
7829 * as sync_io is counted when a request starts, and
7830 * disk_stats is counted when it completes.
7831 * So resync activity will cause curr_events to be smaller than
7832 * when there was no such activity.
7833 * non-sync IO will cause disk_stat to increase without
7834 * increasing sync_io so curr_events will (eventually)
7835 * be larger than it was before. Once it becomes
7836 * substantially larger, the test below will cause
7837 * the array to appear non-idle, and resync will slow
7839 * If there is a lot of outstanding resync activity when
7840 * we set last_event to curr_events, then all that activity
7841 * completing might cause the array to appear non-idle
7842 * and resync will be slowed down even though there might
7843 * not have been non-resync activity. This will only
7844 * happen once though. 'last_events' will soon reflect
7845 * the state where there is little or no outstanding
7846 * resync requests, and further resync activity will
7847 * always make curr_events less than last_events.
7850 if (init
|| curr_events
- rdev
->last_events
> 64) {
7851 rdev
->last_events
= curr_events
;
7859 void md_done_sync(struct mddev
*mddev
, int blocks
, int ok
)
7861 /* another "blocks" (512byte) blocks have been synced */
7862 atomic_sub(blocks
, &mddev
->recovery_active
);
7863 wake_up(&mddev
->recovery_wait
);
7865 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7866 set_bit(MD_RECOVERY_ERROR
, &mddev
->recovery
);
7867 md_wakeup_thread(mddev
->thread
);
7868 // stop recovery, signal do_sync ....
7871 EXPORT_SYMBOL(md_done_sync
);
7873 /* md_write_start(mddev, bi)
7874 * If we need to update some array metadata (e.g. 'active' flag
7875 * in superblock) before writing, schedule a superblock update
7876 * and wait for it to complete.
7878 void md_write_start(struct mddev
*mddev
, struct bio
*bi
)
7881 if (bio_data_dir(bi
) != WRITE
)
7884 BUG_ON(mddev
->ro
== 1);
7885 if (mddev
->ro
== 2) {
7886 /* need to switch to read/write */
7888 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7889 md_wakeup_thread(mddev
->thread
);
7890 md_wakeup_thread(mddev
->sync_thread
);
7893 atomic_inc(&mddev
->writes_pending
);
7894 smp_mb(); /* Match smp_mb in set_in_sync() */
7895 if (mddev
->safemode
== 1)
7896 mddev
->safemode
= 0;
7897 if (mddev
->in_sync
) {
7898 spin_lock(&mddev
->lock
);
7899 if (mddev
->in_sync
) {
7901 set_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
7902 set_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
7903 md_wakeup_thread(mddev
->thread
);
7906 spin_unlock(&mddev
->lock
);
7909 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7910 wait_event(mddev
->sb_wait
,
7911 !test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
));
7913 EXPORT_SYMBOL(md_write_start
);
7915 /* md_write_inc can only be called when md_write_start() has
7916 * already been called at least once of the current request.
7917 * It increments the counter and is useful when a single request
7918 * is split into several parts. Each part causes an increment and
7919 * so needs a matching md_write_end().
7920 * Unlike md_write_start(), it is safe to call md_write_inc() inside
7921 * a spinlocked region.
7923 void md_write_inc(struct mddev
*mddev
, struct bio
*bi
)
7925 if (bio_data_dir(bi
) != WRITE
)
7927 WARN_ON_ONCE(mddev
->in_sync
|| mddev
->ro
);
7928 atomic_inc(&mddev
->writes_pending
);
7930 EXPORT_SYMBOL(md_write_inc
);
7932 void md_write_end(struct mddev
*mddev
)
7934 if (atomic_dec_and_test(&mddev
->writes_pending
)) {
7935 if (mddev
->safemode
== 2)
7936 md_wakeup_thread(mddev
->thread
);
7937 else if (mddev
->safemode_delay
)
7938 mod_timer(&mddev
->safemode_timer
, jiffies
+ mddev
->safemode_delay
);
7941 EXPORT_SYMBOL(md_write_end
);
7943 /* md_allow_write(mddev)
7944 * Calling this ensures that the array is marked 'active' so that writes
7945 * may proceed without blocking. It is important to call this before
7946 * attempting a GFP_KERNEL allocation while holding the mddev lock.
7947 * Must be called with mddev_lock held.
7949 * In the ->external case MD_SB_CHANGE_PENDING can not be cleared until mddev->lock
7950 * is dropped, so return -EAGAIN after notifying userspace.
7952 int md_allow_write(struct mddev
*mddev
)
7958 if (!mddev
->pers
->sync_request
)
7961 spin_lock(&mddev
->lock
);
7962 if (mddev
->in_sync
) {
7964 set_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
7965 set_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
7966 if (mddev
->safemode_delay
&&
7967 mddev
->safemode
== 0)
7968 mddev
->safemode
= 1;
7969 spin_unlock(&mddev
->lock
);
7970 md_update_sb(mddev
, 0);
7971 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7973 spin_unlock(&mddev
->lock
);
7975 if (test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
))
7980 EXPORT_SYMBOL_GPL(md_allow_write
);
7982 #define SYNC_MARKS 10
7983 #define SYNC_MARK_STEP (3*HZ)
7984 #define UPDATE_FREQUENCY (5*60*HZ)
7985 void md_do_sync(struct md_thread
*thread
)
7987 struct mddev
*mddev
= thread
->mddev
;
7988 struct mddev
*mddev2
;
7989 unsigned int currspeed
= 0,
7991 sector_t max_sectors
,j
, io_sectors
, recovery_done
;
7992 unsigned long mark
[SYNC_MARKS
];
7993 unsigned long update_time
;
7994 sector_t mark_cnt
[SYNC_MARKS
];
7996 struct list_head
*tmp
;
7997 sector_t last_check
;
7999 struct md_rdev
*rdev
;
8000 char *desc
, *action
= NULL
;
8001 struct blk_plug plug
;
8004 /* just incase thread restarts... */
8005 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
8007 if (mddev
->ro
) {/* never try to sync a read-only array */
8008 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8012 if (mddev_is_clustered(mddev
)) {
8013 ret
= md_cluster_ops
->resync_start(mddev
);
8017 set_bit(MD_CLUSTER_RESYNC_LOCKED
, &mddev
->flags
);
8018 if (!(test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
8019 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) ||
8020 test_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
))
8021 && ((unsigned long long)mddev
->curr_resync_completed
8022 < (unsigned long long)mddev
->resync_max_sectors
))
8026 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
8027 if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)) {
8028 desc
= "data-check";
8030 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
8031 desc
= "requested-resync";
8035 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
8040 mddev
->last_sync_action
= action
?: desc
;
8042 /* we overload curr_resync somewhat here.
8043 * 0 == not engaged in resync at all
8044 * 2 == checking that there is no conflict with another sync
8045 * 1 == like 2, but have yielded to allow conflicting resync to
8047 * other == active in resync - this many blocks
8049 * Before starting a resync we must have set curr_resync to
8050 * 2, and then checked that every "conflicting" array has curr_resync
8051 * less than ours. When we find one that is the same or higher
8052 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
8053 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
8054 * This will mean we have to start checking from the beginning again.
8059 int mddev2_minor
= -1;
8060 mddev
->curr_resync
= 2;
8063 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
8065 for_each_mddev(mddev2
, tmp
) {
8066 if (mddev2
== mddev
)
8068 if (!mddev
->parallel_resync
8069 && mddev2
->curr_resync
8070 && match_mddev_units(mddev
, mddev2
)) {
8072 if (mddev
< mddev2
&& mddev
->curr_resync
== 2) {
8073 /* arbitrarily yield */
8074 mddev
->curr_resync
= 1;
8075 wake_up(&resync_wait
);
8077 if (mddev
> mddev2
&& mddev
->curr_resync
== 1)
8078 /* no need to wait here, we can wait the next
8079 * time 'round when curr_resync == 2
8082 /* We need to wait 'interruptible' so as not to
8083 * contribute to the load average, and not to
8084 * be caught by 'softlockup'
8086 prepare_to_wait(&resync_wait
, &wq
, TASK_INTERRUPTIBLE
);
8087 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
8088 mddev2
->curr_resync
>= mddev
->curr_resync
) {
8089 if (mddev2_minor
!= mddev2
->md_minor
) {
8090 mddev2_minor
= mddev2
->md_minor
;
8091 pr_info("md: delaying %s of %s until %s has finished (they share one or more physical units)\n",
8092 desc
, mdname(mddev
),
8096 if (signal_pending(current
))
8097 flush_signals(current
);
8099 finish_wait(&resync_wait
, &wq
);
8102 finish_wait(&resync_wait
, &wq
);
8105 } while (mddev
->curr_resync
< 2);
8108 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
8109 /* resync follows the size requested by the personality,
8110 * which defaults to physical size, but can be virtual size
8112 max_sectors
= mddev
->resync_max_sectors
;
8113 atomic64_set(&mddev
->resync_mismatches
, 0);
8114 /* we don't use the checkpoint if there's a bitmap */
8115 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
8116 j
= mddev
->resync_min
;
8117 else if (!mddev
->bitmap
)
8118 j
= mddev
->recovery_cp
;
8120 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
8121 max_sectors
= mddev
->resync_max_sectors
;
8123 /* recovery follows the physical size of devices */
8124 max_sectors
= mddev
->dev_sectors
;
8127 rdev_for_each_rcu(rdev
, mddev
)
8128 if (rdev
->raid_disk
>= 0 &&
8129 !test_bit(Journal
, &rdev
->flags
) &&
8130 !test_bit(Faulty
, &rdev
->flags
) &&
8131 !test_bit(In_sync
, &rdev
->flags
) &&
8132 rdev
->recovery_offset
< j
)
8133 j
= rdev
->recovery_offset
;
8136 /* If there is a bitmap, we need to make sure all
8137 * writes that started before we added a spare
8138 * complete before we start doing a recovery.
8139 * Otherwise the write might complete and (via
8140 * bitmap_endwrite) set a bit in the bitmap after the
8141 * recovery has checked that bit and skipped that
8144 if (mddev
->bitmap
) {
8145 mddev
->pers
->quiesce(mddev
, 1);
8146 mddev
->pers
->quiesce(mddev
, 0);
8150 pr_info("md: %s of RAID array %s\n", desc
, mdname(mddev
));
8151 pr_debug("md: minimum _guaranteed_ speed: %d KB/sec/disk.\n", speed_min(mddev
));
8152 pr_debug("md: using maximum available idle IO bandwidth (but not more than %d KB/sec) for %s.\n",
8153 speed_max(mddev
), desc
);
8155 is_mddev_idle(mddev
, 1); /* this initializes IO event counters */
8158 for (m
= 0; m
< SYNC_MARKS
; m
++) {
8160 mark_cnt
[m
] = io_sectors
;
8163 mddev
->resync_mark
= mark
[last_mark
];
8164 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
8167 * Tune reconstruction:
8169 window
= 32*(PAGE_SIZE
/512);
8170 pr_debug("md: using %dk window, over a total of %lluk.\n",
8171 window
/2, (unsigned long long)max_sectors
/2);
8173 atomic_set(&mddev
->recovery_active
, 0);
8177 pr_debug("md: resuming %s of %s from checkpoint.\n",
8178 desc
, mdname(mddev
));
8179 mddev
->curr_resync
= j
;
8181 mddev
->curr_resync
= 3; /* no longer delayed */
8182 mddev
->curr_resync_completed
= j
;
8183 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
8184 md_new_event(mddev
);
8185 update_time
= jiffies
;
8187 blk_start_plug(&plug
);
8188 while (j
< max_sectors
) {
8193 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
8194 ((mddev
->curr_resync
> mddev
->curr_resync_completed
&&
8195 (mddev
->curr_resync
- mddev
->curr_resync_completed
)
8196 > (max_sectors
>> 4)) ||
8197 time_after_eq(jiffies
, update_time
+ UPDATE_FREQUENCY
) ||
8198 (j
- mddev
->curr_resync_completed
)*2
8199 >= mddev
->resync_max
- mddev
->curr_resync_completed
||
8200 mddev
->curr_resync_completed
> mddev
->resync_max
8202 /* time to update curr_resync_completed */
8203 wait_event(mddev
->recovery_wait
,
8204 atomic_read(&mddev
->recovery_active
) == 0);
8205 mddev
->curr_resync_completed
= j
;
8206 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) &&
8207 j
> mddev
->recovery_cp
)
8208 mddev
->recovery_cp
= j
;
8209 update_time
= jiffies
;
8210 set_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
8211 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
8214 while (j
>= mddev
->resync_max
&&
8215 !test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
8216 /* As this condition is controlled by user-space,
8217 * we can block indefinitely, so use '_interruptible'
8218 * to avoid triggering warnings.
8220 flush_signals(current
); /* just in case */
8221 wait_event_interruptible(mddev
->recovery_wait
,
8222 mddev
->resync_max
> j
8223 || test_bit(MD_RECOVERY_INTR
,
8227 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
8230 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
);
8232 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8236 if (!skipped
) { /* actual IO requested */
8237 io_sectors
+= sectors
;
8238 atomic_add(sectors
, &mddev
->recovery_active
);
8241 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
8245 if (j
> max_sectors
)
8246 /* when skipping, extra large numbers can be returned. */
8249 mddev
->curr_resync
= j
;
8250 mddev
->curr_mark_cnt
= io_sectors
;
8251 if (last_check
== 0)
8252 /* this is the earliest that rebuild will be
8253 * visible in /proc/mdstat
8255 md_new_event(mddev
);
8257 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
8260 last_check
= io_sectors
;
8262 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
8264 int next
= (last_mark
+1) % SYNC_MARKS
;
8266 mddev
->resync_mark
= mark
[next
];
8267 mddev
->resync_mark_cnt
= mark_cnt
[next
];
8268 mark
[next
] = jiffies
;
8269 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
8273 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
8277 * this loop exits only if either when we are slower than
8278 * the 'hard' speed limit, or the system was IO-idle for
8280 * the system might be non-idle CPU-wise, but we only care
8281 * about not overloading the IO subsystem. (things like an
8282 * e2fsck being done on the RAID array should execute fast)
8286 recovery_done
= io_sectors
- atomic_read(&mddev
->recovery_active
);
8287 currspeed
= ((unsigned long)(recovery_done
- mddev
->resync_mark_cnt
))/2
8288 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
8290 if (currspeed
> speed_min(mddev
)) {
8291 if (currspeed
> speed_max(mddev
)) {
8295 if (!is_mddev_idle(mddev
, 0)) {
8297 * Give other IO more of a chance.
8298 * The faster the devices, the less we wait.
8300 wait_event(mddev
->recovery_wait
,
8301 !atomic_read(&mddev
->recovery_active
));
8305 pr_info("md: %s: %s %s.\n",mdname(mddev
), desc
,
8306 test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)
8307 ? "interrupted" : "done");
8309 * this also signals 'finished resyncing' to md_stop
8311 blk_finish_plug(&plug
);
8312 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
8314 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
8315 !test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
8316 mddev
->curr_resync
> 3) {
8317 mddev
->curr_resync_completed
= mddev
->curr_resync
;
8318 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
8320 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
);
8322 if (!test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
) &&
8323 mddev
->curr_resync
> 3) {
8324 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
8325 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
8326 if (mddev
->curr_resync
>= mddev
->recovery_cp
) {
8327 pr_debug("md: checkpointing %s of %s.\n",
8328 desc
, mdname(mddev
));
8329 if (test_bit(MD_RECOVERY_ERROR
,
8331 mddev
->recovery_cp
=
8332 mddev
->curr_resync_completed
;
8334 mddev
->recovery_cp
=
8338 mddev
->recovery_cp
= MaxSector
;
8340 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
8341 mddev
->curr_resync
= MaxSector
;
8343 rdev_for_each_rcu(rdev
, mddev
)
8344 if (rdev
->raid_disk
>= 0 &&
8345 mddev
->delta_disks
>= 0 &&
8346 !test_bit(Journal
, &rdev
->flags
) &&
8347 !test_bit(Faulty
, &rdev
->flags
) &&
8348 !test_bit(In_sync
, &rdev
->flags
) &&
8349 rdev
->recovery_offset
< mddev
->curr_resync
)
8350 rdev
->recovery_offset
= mddev
->curr_resync
;
8355 /* set CHANGE_PENDING here since maybe another update is needed,
8356 * so other nodes are informed. It should be harmless for normal
8358 set_mask_bits(&mddev
->sb_flags
, 0,
8359 BIT(MD_SB_CHANGE_PENDING
) | BIT(MD_SB_CHANGE_DEVS
));
8361 spin_lock(&mddev
->lock
);
8362 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
8363 /* We completed so min/max setting can be forgotten if used. */
8364 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
8365 mddev
->resync_min
= 0;
8366 mddev
->resync_max
= MaxSector
;
8367 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
8368 mddev
->resync_min
= mddev
->curr_resync_completed
;
8369 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
8370 mddev
->curr_resync
= 0;
8371 spin_unlock(&mddev
->lock
);
8373 wake_up(&resync_wait
);
8374 md_wakeup_thread(mddev
->thread
);
8377 EXPORT_SYMBOL_GPL(md_do_sync
);
8379 static int remove_and_add_spares(struct mddev
*mddev
,
8380 struct md_rdev
*this)
8382 struct md_rdev
*rdev
;
8385 bool remove_some
= false;
8387 rdev_for_each(rdev
, mddev
) {
8388 if ((this == NULL
|| rdev
== this) &&
8389 rdev
->raid_disk
>= 0 &&
8390 !test_bit(Blocked
, &rdev
->flags
) &&
8391 test_bit(Faulty
, &rdev
->flags
) &&
8392 atomic_read(&rdev
->nr_pending
)==0) {
8393 /* Faulty non-Blocked devices with nr_pending == 0
8394 * never get nr_pending incremented,
8395 * never get Faulty cleared, and never get Blocked set.
8396 * So we can synchronize_rcu now rather than once per device
8399 set_bit(RemoveSynchronized
, &rdev
->flags
);
8405 rdev_for_each(rdev
, mddev
) {
8406 if ((this == NULL
|| rdev
== this) &&
8407 rdev
->raid_disk
>= 0 &&
8408 !test_bit(Blocked
, &rdev
->flags
) &&
8409 ((test_bit(RemoveSynchronized
, &rdev
->flags
) ||
8410 (!test_bit(In_sync
, &rdev
->flags
) &&
8411 !test_bit(Journal
, &rdev
->flags
))) &&
8412 atomic_read(&rdev
->nr_pending
)==0)) {
8413 if (mddev
->pers
->hot_remove_disk(
8414 mddev
, rdev
) == 0) {
8415 sysfs_unlink_rdev(mddev
, rdev
);
8416 rdev
->raid_disk
= -1;
8420 if (remove_some
&& test_bit(RemoveSynchronized
, &rdev
->flags
))
8421 clear_bit(RemoveSynchronized
, &rdev
->flags
);
8424 if (removed
&& mddev
->kobj
.sd
)
8425 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
8427 if (this && removed
)
8430 rdev_for_each(rdev
, mddev
) {
8431 if (this && this != rdev
)
8433 if (test_bit(Candidate
, &rdev
->flags
))
8435 if (rdev
->raid_disk
>= 0 &&
8436 !test_bit(In_sync
, &rdev
->flags
) &&
8437 !test_bit(Journal
, &rdev
->flags
) &&
8438 !test_bit(Faulty
, &rdev
->flags
))
8440 if (rdev
->raid_disk
>= 0)
8442 if (test_bit(Faulty
, &rdev
->flags
))
8444 if (!test_bit(Journal
, &rdev
->flags
)) {
8446 ! (rdev
->saved_raid_disk
>= 0 &&
8447 !test_bit(Bitmap_sync
, &rdev
->flags
)))
8450 rdev
->recovery_offset
= 0;
8453 hot_add_disk(mddev
, rdev
) == 0) {
8454 if (sysfs_link_rdev(mddev
, rdev
))
8455 /* failure here is OK */;
8456 if (!test_bit(Journal
, &rdev
->flags
))
8458 md_new_event(mddev
);
8459 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
8464 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
8468 static void md_start_sync(struct work_struct
*ws
)
8470 struct mddev
*mddev
= container_of(ws
, struct mddev
, del_work
);
8472 mddev
->sync_thread
= md_register_thread(md_do_sync
,
8475 if (!mddev
->sync_thread
) {
8476 pr_warn("%s: could not start resync thread...\n",
8478 /* leave the spares where they are, it shouldn't hurt */
8479 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8480 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
8481 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
8482 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
8483 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8484 wake_up(&resync_wait
);
8485 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
8487 if (mddev
->sysfs_action
)
8488 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
8490 md_wakeup_thread(mddev
->sync_thread
);
8491 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
8492 md_new_event(mddev
);
8496 * This routine is regularly called by all per-raid-array threads to
8497 * deal with generic issues like resync and super-block update.
8498 * Raid personalities that don't have a thread (linear/raid0) do not
8499 * need this as they never do any recovery or update the superblock.
8501 * It does not do any resync itself, but rather "forks" off other threads
8502 * to do that as needed.
8503 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
8504 * "->recovery" and create a thread at ->sync_thread.
8505 * When the thread finishes it sets MD_RECOVERY_DONE
8506 * and wakeups up this thread which will reap the thread and finish up.
8507 * This thread also removes any faulty devices (with nr_pending == 0).
8509 * The overall approach is:
8510 * 1/ if the superblock needs updating, update it.
8511 * 2/ If a recovery thread is running, don't do anything else.
8512 * 3/ If recovery has finished, clean up, possibly marking spares active.
8513 * 4/ If there are any faulty devices, remove them.
8514 * 5/ If array is degraded, try to add spares devices
8515 * 6/ If array has spares or is not in-sync, start a resync thread.
8517 void md_check_recovery(struct mddev
*mddev
)
8519 if (mddev
->suspended
)
8523 bitmap_daemon_work(mddev
);
8525 if (signal_pending(current
)) {
8526 if (mddev
->pers
->sync_request
&& !mddev
->external
) {
8527 pr_debug("md: %s in immediate safe mode\n",
8529 mddev
->safemode
= 2;
8531 flush_signals(current
);
8534 if (mddev
->ro
&& !test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
8537 (mddev
->sb_flags
& ~ (1<<MD_SB_CHANGE_PENDING
)) ||
8538 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
8539 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
8540 (mddev
->external
== 0 && mddev
->safemode
== 1) ||
8541 (mddev
->safemode
== 2 && ! atomic_read(&mddev
->writes_pending
)
8542 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
8546 if (mddev_trylock(mddev
)) {
8550 struct md_rdev
*rdev
;
8551 if (!mddev
->external
&& mddev
->in_sync
)
8552 /* 'Blocked' flag not needed as failed devices
8553 * will be recorded if array switched to read/write.
8554 * Leaving it set will prevent the device
8555 * from being removed.
8557 rdev_for_each(rdev
, mddev
)
8558 clear_bit(Blocked
, &rdev
->flags
);
8559 /* On a read-only array we can:
8560 * - remove failed devices
8561 * - add already-in_sync devices if the array itself
8563 * As we only add devices that are already in-sync,
8564 * we can activate the spares immediately.
8566 remove_and_add_spares(mddev
, NULL
);
8567 /* There is no thread, but we need to call
8568 * ->spare_active and clear saved_raid_disk
8570 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8571 md_reap_sync_thread(mddev
);
8572 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8573 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
8574 clear_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
8578 if (mddev_is_clustered(mddev
)) {
8579 struct md_rdev
*rdev
;
8580 /* kick the device if another node issued a
8583 rdev_for_each(rdev
, mddev
) {
8584 if (test_and_clear_bit(ClusterRemove
, &rdev
->flags
) &&
8585 rdev
->raid_disk
< 0)
8586 md_kick_rdev_from_array(rdev
);
8590 if (!mddev
->external
&& !mddev
->in_sync
) {
8591 spin_lock(&mddev
->lock
);
8593 spin_unlock(&mddev
->lock
);
8596 if (mddev
->sb_flags
)
8597 md_update_sb(mddev
, 0);
8599 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
8600 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
8601 /* resync/recovery still happening */
8602 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
8605 if (mddev
->sync_thread
) {
8606 md_reap_sync_thread(mddev
);
8609 /* Set RUNNING before clearing NEEDED to avoid
8610 * any transients in the value of "sync_action".
8612 mddev
->curr_resync_completed
= 0;
8613 spin_lock(&mddev
->lock
);
8614 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8615 spin_unlock(&mddev
->lock
);
8616 /* Clear some bits that don't mean anything, but
8619 clear_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8620 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
8622 if (!test_and_clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
8623 test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
8625 /* no recovery is running.
8626 * remove any failed drives, then
8627 * add spares if possible.
8628 * Spares are also removed and re-added, to allow
8629 * the personality to fail the re-add.
8632 if (mddev
->reshape_position
!= MaxSector
) {
8633 if (mddev
->pers
->check_reshape
== NULL
||
8634 mddev
->pers
->check_reshape(mddev
) != 0)
8635 /* Cannot proceed */
8637 set_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
8638 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8639 } else if ((spares
= remove_and_add_spares(mddev
, NULL
))) {
8640 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8641 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
8642 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
8643 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8644 } else if (mddev
->recovery_cp
< MaxSector
) {
8645 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8646 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8647 } else if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
8648 /* nothing to be done ... */
8651 if (mddev
->pers
->sync_request
) {
8653 /* We are adding a device or devices to an array
8654 * which has the bitmap stored on all devices.
8655 * So make sure all bitmap pages get written
8657 bitmap_write_all(mddev
->bitmap
);
8659 INIT_WORK(&mddev
->del_work
, md_start_sync
);
8660 queue_work(md_misc_wq
, &mddev
->del_work
);
8664 if (!mddev
->sync_thread
) {
8665 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8666 wake_up(&resync_wait
);
8667 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
8669 if (mddev
->sysfs_action
)
8670 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
8673 wake_up(&mddev
->sb_wait
);
8674 mddev_unlock(mddev
);
8677 EXPORT_SYMBOL(md_check_recovery
);
8679 void md_reap_sync_thread(struct mddev
*mddev
)
8681 struct md_rdev
*rdev
;
8683 /* resync has finished, collect result */
8684 md_unregister_thread(&mddev
->sync_thread
);
8685 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
8686 !test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
8688 /* activate any spares */
8689 if (mddev
->pers
->spare_active(mddev
)) {
8690 sysfs_notify(&mddev
->kobj
, NULL
,
8692 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
8695 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
8696 mddev
->pers
->finish_reshape
)
8697 mddev
->pers
->finish_reshape(mddev
);
8699 /* If array is no-longer degraded, then any saved_raid_disk
8700 * information must be scrapped.
8702 if (!mddev
->degraded
)
8703 rdev_for_each(rdev
, mddev
)
8704 rdev
->saved_raid_disk
= -1;
8706 md_update_sb(mddev
, 1);
8707 /* MD_SB_CHANGE_PENDING should be cleared by md_update_sb, so we can
8708 * call resync_finish here if MD_CLUSTER_RESYNC_LOCKED is set by
8710 if (test_and_clear_bit(MD_CLUSTER_RESYNC_LOCKED
, &mddev
->flags
))
8711 md_cluster_ops
->resync_finish(mddev
);
8712 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8713 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
8714 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8715 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
8716 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
8717 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
8718 wake_up(&resync_wait
);
8719 /* flag recovery needed just to double check */
8720 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
8721 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
8722 md_new_event(mddev
);
8723 if (mddev
->event_work
.func
)
8724 queue_work(md_misc_wq
, &mddev
->event_work
);
8726 EXPORT_SYMBOL(md_reap_sync_thread
);
8728 void md_wait_for_blocked_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
8730 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
8731 wait_event_timeout(rdev
->blocked_wait
,
8732 !test_bit(Blocked
, &rdev
->flags
) &&
8733 !test_bit(BlockedBadBlocks
, &rdev
->flags
),
8734 msecs_to_jiffies(5000));
8735 rdev_dec_pending(rdev
, mddev
);
8737 EXPORT_SYMBOL(md_wait_for_blocked_rdev
);
8739 void md_finish_reshape(struct mddev
*mddev
)
8741 /* called be personality module when reshape completes. */
8742 struct md_rdev
*rdev
;
8744 rdev_for_each(rdev
, mddev
) {
8745 if (rdev
->data_offset
> rdev
->new_data_offset
)
8746 rdev
->sectors
+= rdev
->data_offset
- rdev
->new_data_offset
;
8748 rdev
->sectors
-= rdev
->new_data_offset
- rdev
->data_offset
;
8749 rdev
->data_offset
= rdev
->new_data_offset
;
8752 EXPORT_SYMBOL(md_finish_reshape
);
8754 /* Bad block management */
8756 /* Returns 1 on success, 0 on failure */
8757 int rdev_set_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
8760 struct mddev
*mddev
= rdev
->mddev
;
8763 s
+= rdev
->new_data_offset
;
8765 s
+= rdev
->data_offset
;
8766 rv
= badblocks_set(&rdev
->badblocks
, s
, sectors
, 0);
8768 /* Make sure they get written out promptly */
8769 if (test_bit(ExternalBbl
, &rdev
->flags
))
8770 sysfs_notify(&rdev
->kobj
, NULL
,
8771 "unacknowledged_bad_blocks");
8772 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
8773 set_mask_bits(&mddev
->sb_flags
, 0,
8774 BIT(MD_SB_CHANGE_CLEAN
) | BIT(MD_SB_CHANGE_PENDING
));
8775 md_wakeup_thread(rdev
->mddev
->thread
);
8780 EXPORT_SYMBOL_GPL(rdev_set_badblocks
);
8782 int rdev_clear_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
8787 s
+= rdev
->new_data_offset
;
8789 s
+= rdev
->data_offset
;
8790 rv
= badblocks_clear(&rdev
->badblocks
, s
, sectors
);
8791 if ((rv
== 0) && test_bit(ExternalBbl
, &rdev
->flags
))
8792 sysfs_notify(&rdev
->kobj
, NULL
, "bad_blocks");
8795 EXPORT_SYMBOL_GPL(rdev_clear_badblocks
);
8797 static int md_notify_reboot(struct notifier_block
*this,
8798 unsigned long code
, void *x
)
8800 struct list_head
*tmp
;
8801 struct mddev
*mddev
;
8804 for_each_mddev(mddev
, tmp
) {
8805 if (mddev_trylock(mddev
)) {
8807 __md_stop_writes(mddev
);
8808 if (mddev
->persistent
)
8809 mddev
->safemode
= 2;
8810 mddev_unlock(mddev
);
8815 * certain more exotic SCSI devices are known to be
8816 * volatile wrt too early system reboots. While the
8817 * right place to handle this issue is the given
8818 * driver, we do want to have a safe RAID driver ...
8826 static struct notifier_block md_notifier
= {
8827 .notifier_call
= md_notify_reboot
,
8829 .priority
= INT_MAX
, /* before any real devices */
8832 static void md_geninit(void)
8834 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
8836 proc_create("mdstat", S_IRUGO
, NULL
, &md_seq_fops
);
8839 static int __init
md_init(void)
8843 md_wq
= alloc_workqueue("md", WQ_MEM_RECLAIM
, 0);
8847 md_misc_wq
= alloc_workqueue("md_misc", 0, 0);
8851 if ((ret
= register_blkdev(MD_MAJOR
, "md")) < 0)
8854 if ((ret
= register_blkdev(0, "mdp")) < 0)
8858 blk_register_region(MKDEV(MD_MAJOR
, 0), 512, THIS_MODULE
,
8859 md_probe
, NULL
, NULL
);
8860 blk_register_region(MKDEV(mdp_major
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
8861 md_probe
, NULL
, NULL
);
8863 register_reboot_notifier(&md_notifier
);
8864 raid_table_header
= register_sysctl_table(raid_root_table
);
8870 unregister_blkdev(MD_MAJOR
, "md");
8872 destroy_workqueue(md_misc_wq
);
8874 destroy_workqueue(md_wq
);
8879 static void check_sb_changes(struct mddev
*mddev
, struct md_rdev
*rdev
)
8881 struct mdp_superblock_1
*sb
= page_address(rdev
->sb_page
);
8882 struct md_rdev
*rdev2
;
8884 char b
[BDEVNAME_SIZE
];
8887 * If size is changed in another node then we need to
8888 * do resize as well.
8890 if (mddev
->dev_sectors
!= le64_to_cpu(sb
->size
)) {
8891 ret
= mddev
->pers
->resize(mddev
, le64_to_cpu(sb
->size
));
8893 pr_info("md-cluster: resize failed\n");
8895 bitmap_update_sb(mddev
->bitmap
);
8898 /* Check for change of roles in the active devices */
8899 rdev_for_each(rdev2
, mddev
) {
8900 if (test_bit(Faulty
, &rdev2
->flags
))
8903 /* Check if the roles changed */
8904 role
= le16_to_cpu(sb
->dev_roles
[rdev2
->desc_nr
]);
8906 if (test_bit(Candidate
, &rdev2
->flags
)) {
8907 if (role
== 0xfffe) {
8908 pr_info("md: Removing Candidate device %s because add failed\n", bdevname(rdev2
->bdev
,b
));
8909 md_kick_rdev_from_array(rdev2
);
8913 clear_bit(Candidate
, &rdev2
->flags
);
8916 if (role
!= rdev2
->raid_disk
) {
8918 if (rdev2
->raid_disk
== -1 && role
!= 0xffff) {
8919 rdev2
->saved_raid_disk
= role
;
8920 ret
= remove_and_add_spares(mddev
, rdev2
);
8921 pr_info("Activated spare: %s\n",
8922 bdevname(rdev2
->bdev
,b
));
8923 /* wakeup mddev->thread here, so array could
8924 * perform resync with the new activated disk */
8925 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
8926 md_wakeup_thread(mddev
->thread
);
8930 * We just want to do the minimum to mark the disk
8931 * as faulty. The recovery is performed by the
8932 * one who initiated the error.
8934 if ((role
== 0xfffe) || (role
== 0xfffd)) {
8935 md_error(mddev
, rdev2
);
8936 clear_bit(Blocked
, &rdev2
->flags
);
8941 if (mddev
->raid_disks
!= le32_to_cpu(sb
->raid_disks
))
8942 update_raid_disks(mddev
, le32_to_cpu(sb
->raid_disks
));
8944 /* Finally set the event to be up to date */
8945 mddev
->events
= le64_to_cpu(sb
->events
);
8948 static int read_rdev(struct mddev
*mddev
, struct md_rdev
*rdev
)
8951 struct page
*swapout
= rdev
->sb_page
;
8952 struct mdp_superblock_1
*sb
;
8954 /* Store the sb page of the rdev in the swapout temporary
8955 * variable in case we err in the future
8957 rdev
->sb_page
= NULL
;
8958 err
= alloc_disk_sb(rdev
);
8960 ClearPageUptodate(rdev
->sb_page
);
8961 rdev
->sb_loaded
= 0;
8962 err
= super_types
[mddev
->major_version
].
8963 load_super(rdev
, NULL
, mddev
->minor_version
);
8966 pr_warn("%s: %d Could not reload rdev(%d) err: %d. Restoring old values\n",
8967 __func__
, __LINE__
, rdev
->desc_nr
, err
);
8969 put_page(rdev
->sb_page
);
8970 rdev
->sb_page
= swapout
;
8971 rdev
->sb_loaded
= 1;
8975 sb
= page_address(rdev
->sb_page
);
8976 /* Read the offset unconditionally, even if MD_FEATURE_RECOVERY_OFFSET
8980 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RECOVERY_OFFSET
))
8981 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
8983 /* The other node finished recovery, call spare_active to set
8984 * device In_sync and mddev->degraded
8986 if (rdev
->recovery_offset
== MaxSector
&&
8987 !test_bit(In_sync
, &rdev
->flags
) &&
8988 mddev
->pers
->spare_active(mddev
))
8989 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
8995 void md_reload_sb(struct mddev
*mddev
, int nr
)
8997 struct md_rdev
*rdev
;
9001 rdev_for_each_rcu(rdev
, mddev
) {
9002 if (rdev
->desc_nr
== nr
)
9006 if (!rdev
|| rdev
->desc_nr
!= nr
) {
9007 pr_warn("%s: %d Could not find rdev with nr %d\n", __func__
, __LINE__
, nr
);
9011 err
= read_rdev(mddev
, rdev
);
9015 check_sb_changes(mddev
, rdev
);
9017 /* Read all rdev's to update recovery_offset */
9018 rdev_for_each_rcu(rdev
, mddev
)
9019 read_rdev(mddev
, rdev
);
9021 EXPORT_SYMBOL(md_reload_sb
);
9026 * Searches all registered partitions for autorun RAID arrays
9030 static DEFINE_MUTEX(detected_devices_mutex
);
9031 static LIST_HEAD(all_detected_devices
);
9032 struct detected_devices_node
{
9033 struct list_head list
;
9037 void md_autodetect_dev(dev_t dev
)
9039 struct detected_devices_node
*node_detected_dev
;
9041 node_detected_dev
= kzalloc(sizeof(*node_detected_dev
), GFP_KERNEL
);
9042 if (node_detected_dev
) {
9043 node_detected_dev
->dev
= dev
;
9044 mutex_lock(&detected_devices_mutex
);
9045 list_add_tail(&node_detected_dev
->list
, &all_detected_devices
);
9046 mutex_unlock(&detected_devices_mutex
);
9050 static void autostart_arrays(int part
)
9052 struct md_rdev
*rdev
;
9053 struct detected_devices_node
*node_detected_dev
;
9055 int i_scanned
, i_passed
;
9060 pr_info("md: Autodetecting RAID arrays.\n");
9062 mutex_lock(&detected_devices_mutex
);
9063 while (!list_empty(&all_detected_devices
) && i_scanned
< INT_MAX
) {
9065 node_detected_dev
= list_entry(all_detected_devices
.next
,
9066 struct detected_devices_node
, list
);
9067 list_del(&node_detected_dev
->list
);
9068 dev
= node_detected_dev
->dev
;
9069 kfree(node_detected_dev
);
9070 mutex_unlock(&detected_devices_mutex
);
9071 rdev
= md_import_device(dev
,0, 90);
9072 mutex_lock(&detected_devices_mutex
);
9076 if (test_bit(Faulty
, &rdev
->flags
))
9079 set_bit(AutoDetected
, &rdev
->flags
);
9080 list_add(&rdev
->same_set
, &pending_raid_disks
);
9083 mutex_unlock(&detected_devices_mutex
);
9085 pr_debug("md: Scanned %d and added %d devices.\n", i_scanned
, i_passed
);
9087 autorun_devices(part
);
9090 #endif /* !MODULE */
9092 static __exit
void md_exit(void)
9094 struct mddev
*mddev
;
9095 struct list_head
*tmp
;
9098 blk_unregister_region(MKDEV(MD_MAJOR
,0), 512);
9099 blk_unregister_region(MKDEV(mdp_major
,0), 1U << MINORBITS
);
9101 unregister_blkdev(MD_MAJOR
,"md");
9102 unregister_blkdev(mdp_major
, "mdp");
9103 unregister_reboot_notifier(&md_notifier
);
9104 unregister_sysctl_table(raid_table_header
);
9106 /* We cannot unload the modules while some process is
9107 * waiting for us in select() or poll() - wake them up
9110 while (waitqueue_active(&md_event_waiters
)) {
9111 /* not safe to leave yet */
9112 wake_up(&md_event_waiters
);
9116 remove_proc_entry("mdstat", NULL
);
9118 for_each_mddev(mddev
, tmp
) {
9119 export_array(mddev
);
9121 mddev
->hold_active
= 0;
9123 * for_each_mddev() will call mddev_put() at the end of each
9124 * iteration. As the mddev is now fully clear, this will
9125 * schedule the mddev for destruction by a workqueue, and the
9126 * destroy_workqueue() below will wait for that to complete.
9129 destroy_workqueue(md_misc_wq
);
9130 destroy_workqueue(md_wq
);
9133 subsys_initcall(md_init
);
9134 module_exit(md_exit
)
9136 static int get_ro(char *buffer
, struct kernel_param
*kp
)
9138 return sprintf(buffer
, "%d", start_readonly
);
9140 static int set_ro(const char *val
, struct kernel_param
*kp
)
9142 return kstrtouint(val
, 10, (unsigned int *)&start_readonly
);
9145 module_param_call(start_ro
, set_ro
, get_ro
, NULL
, S_IRUSR
|S_IWUSR
);
9146 module_param(start_dirty_degraded
, int, S_IRUGO
|S_IWUSR
);
9147 module_param_call(new_array
, add_named_array
, NULL
, NULL
, S_IWUSR
);
9149 MODULE_LICENSE("GPL");
9150 MODULE_DESCRIPTION("MD RAID framework");
9152 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);