1 // SPDX-License-Identifier: GPL-2.0-or-later
3 md.c : Multiple Devices driver for Linux
4 Copyright (C) 1998, 1999, 2000 Ingo Molnar
6 completely rewritten, based on the MD driver code from Marc Zyngier
10 - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar
11 - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com>
12 - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net>
13 - kerneld support by Boris Tobotras <boris@xtalk.msk.su>
14 - kmod support by: Cyrus Durgin
15 - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com>
16 - Devfs support by Richard Gooch <rgooch@atnf.csiro.au>
18 - lots of fixes and improvements to the RAID1/RAID5 and generic
19 RAID code (such as request based resynchronization):
21 Neil Brown <neilb@cse.unsw.edu.au>.
23 - persistent bitmap code
24 Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.
27 Errors, Warnings, etc.
29 pr_crit() for error conditions that risk data loss
30 pr_err() for error conditions that are unexpected, like an IO error
31 or internal inconsistency
32 pr_warn() for error conditions that could have been predicated, like
33 adding a device to an array when it has incompatible metadata
34 pr_info() for every interesting, very rare events, like an array starting
35 or stopping, or resync starting or stopping
36 pr_debug() for everything else.
40 #include <linux/sched/mm.h>
41 #include <linux/sched/signal.h>
42 #include <linux/kthread.h>
43 #include <linux/blkdev.h>
44 #include <linux/blk-integrity.h>
45 #include <linux/badblocks.h>
46 #include <linux/sysctl.h>
47 #include <linux/seq_file.h>
49 #include <linux/poll.h>
50 #include <linux/ctype.h>
51 #include <linux/string.h>
52 #include <linux/hdreg.h>
53 #include <linux/proc_fs.h>
54 #include <linux/random.h>
55 #include <linux/major.h>
56 #include <linux/module.h>
57 #include <linux/reboot.h>
58 #include <linux/file.h>
59 #include <linux/compat.h>
60 #include <linux/delay.h>
61 #include <linux/raid/md_p.h>
62 #include <linux/raid/md_u.h>
63 #include <linux/raid/detect.h>
64 #include <linux/slab.h>
65 #include <linux/percpu-refcount.h>
66 #include <linux/part_stat.h>
68 #include <trace/events/block.h>
70 #include "md-bitmap.h"
71 #include "md-cluster.h"
73 /* pers_list is a list of registered personalities protected
75 * pers_lock does extra service to protect accesses to
76 * mddev->thread when the mutex cannot be held.
78 static LIST_HEAD(pers_list
);
79 static DEFINE_SPINLOCK(pers_lock
);
81 static struct kobj_type md_ktype
;
83 struct md_cluster_operations
*md_cluster_ops
;
84 EXPORT_SYMBOL(md_cluster_ops
);
85 static struct module
*md_cluster_mod
;
87 static DECLARE_WAIT_QUEUE_HEAD(resync_wait
);
88 static struct workqueue_struct
*md_wq
;
89 static struct workqueue_struct
*md_misc_wq
;
90 static struct workqueue_struct
*md_rdev_misc_wq
;
92 static int remove_and_add_spares(struct mddev
*mddev
,
93 struct md_rdev
*this);
94 static void mddev_detach(struct mddev
*mddev
);
97 * Default number of read corrections we'll attempt on an rdev
98 * before ejecting it from the array. We divide the read error
99 * count by 2 for every hour elapsed between read errors.
101 #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
102 /* Default safemode delay: 200 msec */
103 #define DEFAULT_SAFEMODE_DELAY ((200 * HZ)/1000 +1)
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 void rdev_uninit_serial(struct md_rdev
*rdev
)
133 if (!test_and_clear_bit(CollisionCheck
, &rdev
->flags
))
136 kvfree(rdev
->serial
);
140 static void rdevs_uninit_serial(struct mddev
*mddev
)
142 struct md_rdev
*rdev
;
144 rdev_for_each(rdev
, mddev
)
145 rdev_uninit_serial(rdev
);
148 static int rdev_init_serial(struct md_rdev
*rdev
)
150 /* serial_nums equals with BARRIER_BUCKETS_NR */
151 int i
, serial_nums
= 1 << ((PAGE_SHIFT
- ilog2(sizeof(atomic_t
))));
152 struct serial_in_rdev
*serial
= NULL
;
154 if (test_bit(CollisionCheck
, &rdev
->flags
))
157 serial
= kvmalloc(sizeof(struct serial_in_rdev
) * serial_nums
,
162 for (i
= 0; i
< serial_nums
; i
++) {
163 struct serial_in_rdev
*serial_tmp
= &serial
[i
];
165 spin_lock_init(&serial_tmp
->serial_lock
);
166 serial_tmp
->serial_rb
= RB_ROOT_CACHED
;
167 init_waitqueue_head(&serial_tmp
->serial_io_wait
);
170 rdev
->serial
= serial
;
171 set_bit(CollisionCheck
, &rdev
->flags
);
176 static int rdevs_init_serial(struct mddev
*mddev
)
178 struct md_rdev
*rdev
;
181 rdev_for_each(rdev
, mddev
) {
182 ret
= rdev_init_serial(rdev
);
187 /* Free all resources if pool is not existed */
188 if (ret
&& !mddev
->serial_info_pool
)
189 rdevs_uninit_serial(mddev
);
195 * rdev needs to enable serial stuffs if it meets the conditions:
196 * 1. it is multi-queue device flaged with writemostly.
197 * 2. the write-behind mode is enabled.
199 static int rdev_need_serial(struct md_rdev
*rdev
)
201 return (rdev
&& rdev
->mddev
->bitmap_info
.max_write_behind
> 0 &&
202 rdev
->bdev
->bd_disk
->queue
->nr_hw_queues
!= 1 &&
203 test_bit(WriteMostly
, &rdev
->flags
));
207 * Init resource for rdev(s), then create serial_info_pool if:
208 * 1. rdev is the first device which return true from rdev_enable_serial.
209 * 2. rdev is NULL, means we want to enable serialization for all rdevs.
211 void mddev_create_serial_pool(struct mddev
*mddev
, struct md_rdev
*rdev
,
216 if (rdev
&& !rdev_need_serial(rdev
) &&
217 !test_bit(CollisionCheck
, &rdev
->flags
))
221 mddev_suspend(mddev
);
224 ret
= rdevs_init_serial(mddev
);
226 ret
= rdev_init_serial(rdev
);
230 if (mddev
->serial_info_pool
== NULL
) {
232 * already in memalloc noio context by
235 mddev
->serial_info_pool
=
236 mempool_create_kmalloc_pool(NR_SERIAL_INFOS
,
237 sizeof(struct serial_info
));
238 if (!mddev
->serial_info_pool
) {
239 rdevs_uninit_serial(mddev
);
240 pr_err("can't alloc memory pool for serialization\n");
250 * Free resource from rdev(s), and destroy serial_info_pool under conditions:
251 * 1. rdev is the last device flaged with CollisionCheck.
252 * 2. when bitmap is destroyed while policy is not enabled.
253 * 3. for disable policy, the pool is destroyed only when no rdev needs it.
255 void mddev_destroy_serial_pool(struct mddev
*mddev
, struct md_rdev
*rdev
,
258 if (rdev
&& !test_bit(CollisionCheck
, &rdev
->flags
))
261 if (mddev
->serial_info_pool
) {
262 struct md_rdev
*temp
;
263 int num
= 0; /* used to track if other rdevs need the pool */
266 mddev_suspend(mddev
);
267 rdev_for_each(temp
, mddev
) {
269 if (!mddev
->serialize_policy
||
270 !rdev_need_serial(temp
))
271 rdev_uninit_serial(temp
);
274 } else if (temp
!= rdev
&&
275 test_bit(CollisionCheck
, &temp
->flags
))
280 rdev_uninit_serial(rdev
);
283 pr_info("The mempool could be used by other devices\n");
285 mempool_destroy(mddev
->serial_info_pool
);
286 mddev
->serial_info_pool
= NULL
;
293 static struct ctl_table_header
*raid_table_header
;
295 static struct ctl_table raid_table
[] = {
297 .procname
= "speed_limit_min",
298 .data
= &sysctl_speed_limit_min
,
299 .maxlen
= sizeof(int),
300 .mode
= S_IRUGO
|S_IWUSR
,
301 .proc_handler
= proc_dointvec
,
304 .procname
= "speed_limit_max",
305 .data
= &sysctl_speed_limit_max
,
306 .maxlen
= sizeof(int),
307 .mode
= S_IRUGO
|S_IWUSR
,
308 .proc_handler
= proc_dointvec
,
313 static struct ctl_table raid_dir_table
[] = {
317 .mode
= S_IRUGO
|S_IXUGO
,
323 static struct ctl_table raid_root_table
[] = {
328 .child
= raid_dir_table
,
333 static int start_readonly
;
336 * The original mechanism for creating an md device is to create
337 * a device node in /dev and to open it. This causes races with device-close.
338 * The preferred method is to write to the "new_array" module parameter.
339 * This can avoid races.
340 * Setting create_on_open to false disables the original mechanism
341 * so all the races disappear.
343 static bool create_on_open
= true;
346 * We have a system wide 'event count' that is incremented
347 * on any 'interesting' event, and readers of /proc/mdstat
348 * can use 'poll' or 'select' to find out when the event
352 * start array, stop array, error, add device, remove device,
353 * start build, activate spare
355 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters
);
356 static atomic_t md_event_count
;
357 void md_new_event(void)
359 atomic_inc(&md_event_count
);
360 wake_up(&md_event_waiters
);
362 EXPORT_SYMBOL_GPL(md_new_event
);
365 * Enables to iterate over all existing md arrays
366 * all_mddevs_lock protects this list.
368 static LIST_HEAD(all_mddevs
);
369 static DEFINE_SPINLOCK(all_mddevs_lock
);
372 * iterates through all used mddevs in the system.
373 * We take care to grab the all_mddevs_lock whenever navigating
374 * the list, and to always hold a refcount when unlocked.
375 * Any code which breaks out of this loop while own
376 * a reference to the current mddev and must mddev_put it.
378 #define for_each_mddev(_mddev,_tmp) \
380 for (({ spin_lock(&all_mddevs_lock); \
381 _tmp = all_mddevs.next; \
383 ({ if (_tmp != &all_mddevs) \
384 mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\
385 spin_unlock(&all_mddevs_lock); \
386 if (_mddev) mddev_put(_mddev); \
387 _mddev = list_entry(_tmp, struct mddev, all_mddevs); \
388 _tmp != &all_mddevs;}); \
389 ({ spin_lock(&all_mddevs_lock); \
390 _tmp = _tmp->next;}) \
393 /* Rather than calling directly into the personality make_request function,
394 * IO requests come here first so that we can check if the device is
395 * being suspended pending a reconfiguration.
396 * We hold a refcount over the call to ->make_request. By the time that
397 * call has finished, the bio has been linked into some internal structure
398 * and so is visible to ->quiesce(), so we don't need the refcount any more.
400 static bool is_suspended(struct mddev
*mddev
, struct bio
*bio
)
402 if (mddev
->suspended
)
404 if (bio_data_dir(bio
) != WRITE
)
406 if (mddev
->suspend_lo
>= mddev
->suspend_hi
)
408 if (bio
->bi_iter
.bi_sector
>= mddev
->suspend_hi
)
410 if (bio_end_sector(bio
) < mddev
->suspend_lo
)
415 void md_handle_request(struct mddev
*mddev
, struct bio
*bio
)
419 if (is_suspended(mddev
, bio
)) {
421 /* Bail out if REQ_NOWAIT is set for the bio */
422 if (bio
->bi_opf
& REQ_NOWAIT
) {
424 bio_wouldblock_error(bio
);
428 prepare_to_wait(&mddev
->sb_wait
, &__wait
,
429 TASK_UNINTERRUPTIBLE
);
430 if (!is_suspended(mddev
, bio
))
436 finish_wait(&mddev
->sb_wait
, &__wait
);
438 atomic_inc(&mddev
->active_io
);
441 if (!mddev
->pers
->make_request(mddev
, bio
)) {
442 atomic_dec(&mddev
->active_io
);
443 wake_up(&mddev
->sb_wait
);
444 goto check_suspended
;
447 if (atomic_dec_and_test(&mddev
->active_io
) && mddev
->suspended
)
448 wake_up(&mddev
->sb_wait
);
450 EXPORT_SYMBOL(md_handle_request
);
452 static void md_submit_bio(struct bio
*bio
)
454 const int rw
= bio_data_dir(bio
);
455 struct mddev
*mddev
= bio
->bi_bdev
->bd_disk
->private_data
;
457 if (mddev
== NULL
|| mddev
->pers
== NULL
) {
462 if (unlikely(test_bit(MD_BROKEN
, &mddev
->flags
)) && (rw
== WRITE
)) {
467 blk_queue_split(&bio
);
469 if (mddev
->ro
== 1 && unlikely(rw
== WRITE
)) {
470 if (bio_sectors(bio
) != 0)
471 bio
->bi_status
= BLK_STS_IOERR
;
476 /* bio could be mergeable after passing to underlayer */
477 bio
->bi_opf
&= ~REQ_NOMERGE
;
479 md_handle_request(mddev
, bio
);
482 /* mddev_suspend makes sure no new requests are submitted
483 * to the device, and that any requests that have been submitted
484 * are completely handled.
485 * Once mddev_detach() is called and completes, the module will be
488 void mddev_suspend(struct mddev
*mddev
)
490 WARN_ON_ONCE(mddev
->thread
&& current
== mddev
->thread
->tsk
);
491 lockdep_assert_held(&mddev
->reconfig_mutex
);
492 if (mddev
->suspended
++)
495 wake_up(&mddev
->sb_wait
);
496 set_bit(MD_ALLOW_SB_UPDATE
, &mddev
->flags
);
497 smp_mb__after_atomic();
498 wait_event(mddev
->sb_wait
, atomic_read(&mddev
->active_io
) == 0);
499 mddev
->pers
->quiesce(mddev
, 1);
500 clear_bit_unlock(MD_ALLOW_SB_UPDATE
, &mddev
->flags
);
501 wait_event(mddev
->sb_wait
, !test_bit(MD_UPDATING_SB
, &mddev
->flags
));
503 del_timer_sync(&mddev
->safemode_timer
);
504 /* restrict memory reclaim I/O during raid array is suspend */
505 mddev
->noio_flag
= memalloc_noio_save();
507 EXPORT_SYMBOL_GPL(mddev_suspend
);
509 void mddev_resume(struct mddev
*mddev
)
511 /* entred the memalloc scope from mddev_suspend() */
512 memalloc_noio_restore(mddev
->noio_flag
);
513 lockdep_assert_held(&mddev
->reconfig_mutex
);
514 if (--mddev
->suspended
)
516 wake_up(&mddev
->sb_wait
);
517 mddev
->pers
->quiesce(mddev
, 0);
519 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
520 md_wakeup_thread(mddev
->thread
);
521 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
523 EXPORT_SYMBOL_GPL(mddev_resume
);
526 * Generic flush handling for md
529 static void md_end_flush(struct bio
*bio
)
531 struct md_rdev
*rdev
= bio
->bi_private
;
532 struct mddev
*mddev
= rdev
->mddev
;
534 rdev_dec_pending(rdev
, mddev
);
536 if (atomic_dec_and_test(&mddev
->flush_pending
)) {
537 /* The pre-request flush has finished */
538 queue_work(md_wq
, &mddev
->flush_work
);
543 static void md_submit_flush_data(struct work_struct
*ws
);
545 static void submit_flushes(struct work_struct
*ws
)
547 struct mddev
*mddev
= container_of(ws
, struct mddev
, flush_work
);
548 struct md_rdev
*rdev
;
550 mddev
->start_flush
= ktime_get_boottime();
551 INIT_WORK(&mddev
->flush_work
, md_submit_flush_data
);
552 atomic_set(&mddev
->flush_pending
, 1);
554 rdev_for_each_rcu(rdev
, mddev
)
555 if (rdev
->raid_disk
>= 0 &&
556 !test_bit(Faulty
, &rdev
->flags
)) {
557 /* Take two references, one is dropped
558 * when request finishes, one after
559 * we reclaim rcu_read_lock
562 atomic_inc(&rdev
->nr_pending
);
563 atomic_inc(&rdev
->nr_pending
);
565 bi
= bio_alloc_bioset(rdev
->bdev
, 0,
566 REQ_OP_WRITE
| REQ_PREFLUSH
,
567 GFP_NOIO
, &mddev
->bio_set
);
568 bi
->bi_end_io
= md_end_flush
;
569 bi
->bi_private
= rdev
;
570 atomic_inc(&mddev
->flush_pending
);
573 rdev_dec_pending(rdev
, mddev
);
576 if (atomic_dec_and_test(&mddev
->flush_pending
))
577 queue_work(md_wq
, &mddev
->flush_work
);
580 static void md_submit_flush_data(struct work_struct
*ws
)
582 struct mddev
*mddev
= container_of(ws
, struct mddev
, flush_work
);
583 struct bio
*bio
= mddev
->flush_bio
;
586 * must reset flush_bio before calling into md_handle_request to avoid a
587 * deadlock, because other bios passed md_handle_request suspend check
588 * could wait for this and below md_handle_request could wait for those
589 * bios because of suspend check
591 spin_lock_irq(&mddev
->lock
);
592 mddev
->prev_flush_start
= mddev
->start_flush
;
593 mddev
->flush_bio
= NULL
;
594 spin_unlock_irq(&mddev
->lock
);
595 wake_up(&mddev
->sb_wait
);
597 if (bio
->bi_iter
.bi_size
== 0) {
598 /* an empty barrier - all done */
601 bio
->bi_opf
&= ~REQ_PREFLUSH
;
602 md_handle_request(mddev
, bio
);
607 * Manages consolidation of flushes and submitting any flushes needed for
608 * a bio with REQ_PREFLUSH. Returns true if the bio is finished or is
609 * being finished in another context. Returns false if the flushing is
610 * complete but still needs the I/O portion of the bio to be processed.
612 bool md_flush_request(struct mddev
*mddev
, struct bio
*bio
)
614 ktime_t req_start
= ktime_get_boottime();
615 spin_lock_irq(&mddev
->lock
);
616 /* flush requests wait until ongoing flush completes,
617 * hence coalescing all the pending requests.
619 wait_event_lock_irq(mddev
->sb_wait
,
621 ktime_before(req_start
, mddev
->prev_flush_start
),
623 /* new request after previous flush is completed */
624 if (ktime_after(req_start
, mddev
->prev_flush_start
)) {
625 WARN_ON(mddev
->flush_bio
);
626 mddev
->flush_bio
= bio
;
629 spin_unlock_irq(&mddev
->lock
);
632 INIT_WORK(&mddev
->flush_work
, submit_flushes
);
633 queue_work(md_wq
, &mddev
->flush_work
);
635 /* flush was performed for some other bio while we waited. */
636 if (bio
->bi_iter
.bi_size
== 0)
637 /* an empty barrier - all done */
640 bio
->bi_opf
&= ~REQ_PREFLUSH
;
646 EXPORT_SYMBOL(md_flush_request
);
648 static inline struct mddev
*mddev_get(struct mddev
*mddev
)
650 atomic_inc(&mddev
->active
);
654 static void mddev_delayed_delete(struct work_struct
*ws
);
656 static void mddev_put(struct mddev
*mddev
)
658 if (!atomic_dec_and_lock(&mddev
->active
, &all_mddevs_lock
))
660 if (!mddev
->raid_disks
&& list_empty(&mddev
->disks
) &&
661 mddev
->ctime
== 0 && !mddev
->hold_active
) {
662 /* Array is not configured at all, and not held active,
664 list_del_init(&mddev
->all_mddevs
);
667 * Call queue_work inside the spinlock so that
668 * flush_workqueue() after mddev_find will succeed in waiting
669 * for the work to be done.
671 INIT_WORK(&mddev
->del_work
, mddev_delayed_delete
);
672 queue_work(md_misc_wq
, &mddev
->del_work
);
674 spin_unlock(&all_mddevs_lock
);
677 static void md_safemode_timeout(struct timer_list
*t
);
679 void mddev_init(struct mddev
*mddev
)
681 mutex_init(&mddev
->open_mutex
);
682 mutex_init(&mddev
->reconfig_mutex
);
683 mutex_init(&mddev
->bitmap_info
.mutex
);
684 INIT_LIST_HEAD(&mddev
->disks
);
685 INIT_LIST_HEAD(&mddev
->all_mddevs
);
686 timer_setup(&mddev
->safemode_timer
, md_safemode_timeout
, 0);
687 atomic_set(&mddev
->active
, 1);
688 atomic_set(&mddev
->openers
, 0);
689 atomic_set(&mddev
->active_io
, 0);
690 spin_lock_init(&mddev
->lock
);
691 atomic_set(&mddev
->flush_pending
, 0);
692 init_waitqueue_head(&mddev
->sb_wait
);
693 init_waitqueue_head(&mddev
->recovery_wait
);
694 mddev
->reshape_position
= MaxSector
;
695 mddev
->reshape_backwards
= 0;
696 mddev
->last_sync_action
= "none";
697 mddev
->resync_min
= 0;
698 mddev
->resync_max
= MaxSector
;
699 mddev
->level
= LEVEL_NONE
;
701 EXPORT_SYMBOL_GPL(mddev_init
);
703 static struct mddev
*mddev_find_locked(dev_t unit
)
707 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
708 if (mddev
->unit
== unit
)
714 /* find an unused unit number */
715 static dev_t
mddev_alloc_unit(void)
717 static int next_minor
= 512;
718 int start
= next_minor
;
723 dev
= MKDEV(MD_MAJOR
, next_minor
);
725 if (next_minor
> MINORMASK
)
727 if (next_minor
== start
)
728 return 0; /* Oh dear, all in use. */
729 is_free
= !mddev_find_locked(dev
);
735 static struct mddev
*mddev_find(dev_t unit
)
739 if (MAJOR(unit
) != MD_MAJOR
)
740 unit
&= ~((1 << MdpMinorShift
) - 1);
742 spin_lock(&all_mddevs_lock
);
743 mddev
= mddev_find_locked(unit
);
746 spin_unlock(&all_mddevs_lock
);
751 static struct mddev
*mddev_alloc(dev_t unit
)
756 if (unit
&& MAJOR(unit
) != MD_MAJOR
)
757 unit
&= ~((1 << MdpMinorShift
) - 1);
759 new = kzalloc(sizeof(*new), GFP_KERNEL
);
761 return ERR_PTR(-ENOMEM
);
764 spin_lock(&all_mddevs_lock
);
767 if (mddev_find_locked(unit
))
770 if (MAJOR(unit
) == MD_MAJOR
)
771 new->md_minor
= MINOR(unit
);
773 new->md_minor
= MINOR(unit
) >> MdpMinorShift
;
774 new->hold_active
= UNTIL_IOCTL
;
777 new->unit
= mddev_alloc_unit();
780 new->md_minor
= MINOR(new->unit
);
781 new->hold_active
= UNTIL_STOP
;
784 list_add(&new->all_mddevs
, &all_mddevs
);
785 spin_unlock(&all_mddevs_lock
);
788 spin_unlock(&all_mddevs_lock
);
790 return ERR_PTR(error
);
793 static void mddev_free(struct mddev
*mddev
)
795 spin_lock(&all_mddevs_lock
);
796 list_del(&mddev
->all_mddevs
);
797 spin_unlock(&all_mddevs_lock
);
802 static const struct attribute_group md_redundancy_group
;
804 void mddev_unlock(struct mddev
*mddev
)
806 if (mddev
->to_remove
) {
807 /* These cannot be removed under reconfig_mutex as
808 * an access to the files will try to take reconfig_mutex
809 * while holding the file unremovable, which leads to
811 * So hold set sysfs_active while the remove in happeing,
812 * and anything else which might set ->to_remove or my
813 * otherwise change the sysfs namespace will fail with
814 * -EBUSY if sysfs_active is still set.
815 * We set sysfs_active under reconfig_mutex and elsewhere
816 * test it under the same mutex to ensure its correct value
819 const struct attribute_group
*to_remove
= mddev
->to_remove
;
820 mddev
->to_remove
= NULL
;
821 mddev
->sysfs_active
= 1;
822 mutex_unlock(&mddev
->reconfig_mutex
);
824 if (mddev
->kobj
.sd
) {
825 if (to_remove
!= &md_redundancy_group
)
826 sysfs_remove_group(&mddev
->kobj
, to_remove
);
827 if (mddev
->pers
== NULL
||
828 mddev
->pers
->sync_request
== NULL
) {
829 sysfs_remove_group(&mddev
->kobj
, &md_redundancy_group
);
830 if (mddev
->sysfs_action
)
831 sysfs_put(mddev
->sysfs_action
);
832 if (mddev
->sysfs_completed
)
833 sysfs_put(mddev
->sysfs_completed
);
834 if (mddev
->sysfs_degraded
)
835 sysfs_put(mddev
->sysfs_degraded
);
836 mddev
->sysfs_action
= NULL
;
837 mddev
->sysfs_completed
= NULL
;
838 mddev
->sysfs_degraded
= NULL
;
841 mddev
->sysfs_active
= 0;
843 mutex_unlock(&mddev
->reconfig_mutex
);
845 /* As we've dropped the mutex we need a spinlock to
846 * make sure the thread doesn't disappear
848 spin_lock(&pers_lock
);
849 md_wakeup_thread(mddev
->thread
);
850 wake_up(&mddev
->sb_wait
);
851 spin_unlock(&pers_lock
);
853 EXPORT_SYMBOL_GPL(mddev_unlock
);
855 struct md_rdev
*md_find_rdev_nr_rcu(struct mddev
*mddev
, int nr
)
857 struct md_rdev
*rdev
;
859 rdev_for_each_rcu(rdev
, mddev
)
860 if (rdev
->desc_nr
== nr
)
865 EXPORT_SYMBOL_GPL(md_find_rdev_nr_rcu
);
867 static struct md_rdev
*find_rdev(struct mddev
*mddev
, dev_t dev
)
869 struct md_rdev
*rdev
;
871 rdev_for_each(rdev
, mddev
)
872 if (rdev
->bdev
->bd_dev
== dev
)
878 struct md_rdev
*md_find_rdev_rcu(struct mddev
*mddev
, dev_t dev
)
880 struct md_rdev
*rdev
;
882 rdev_for_each_rcu(rdev
, mddev
)
883 if (rdev
->bdev
->bd_dev
== dev
)
888 EXPORT_SYMBOL_GPL(md_find_rdev_rcu
);
890 static struct md_personality
*find_pers(int level
, char *clevel
)
892 struct md_personality
*pers
;
893 list_for_each_entry(pers
, &pers_list
, list
) {
894 if (level
!= LEVEL_NONE
&& pers
->level
== level
)
896 if (strcmp(pers
->name
, clevel
)==0)
902 /* return the offset of the super block in 512byte sectors */
903 static inline sector_t
calc_dev_sboffset(struct md_rdev
*rdev
)
905 return MD_NEW_SIZE_SECTORS(bdev_nr_sectors(rdev
->bdev
));
908 static int alloc_disk_sb(struct md_rdev
*rdev
)
910 rdev
->sb_page
= alloc_page(GFP_KERNEL
);
916 void md_rdev_clear(struct md_rdev
*rdev
)
919 put_page(rdev
->sb_page
);
921 rdev
->sb_page
= NULL
;
926 put_page(rdev
->bb_page
);
927 rdev
->bb_page
= NULL
;
929 badblocks_exit(&rdev
->badblocks
);
931 EXPORT_SYMBOL_GPL(md_rdev_clear
);
933 static void super_written(struct bio
*bio
)
935 struct md_rdev
*rdev
= bio
->bi_private
;
936 struct mddev
*mddev
= rdev
->mddev
;
938 if (bio
->bi_status
) {
939 pr_err("md: %s gets error=%d\n", __func__
,
940 blk_status_to_errno(bio
->bi_status
));
941 md_error(mddev
, rdev
);
942 if (!test_bit(Faulty
, &rdev
->flags
)
943 && (bio
->bi_opf
& MD_FAILFAST
)) {
944 set_bit(MD_SB_NEED_REWRITE
, &mddev
->sb_flags
);
945 set_bit(LastDev
, &rdev
->flags
);
948 clear_bit(LastDev
, &rdev
->flags
);
950 if (atomic_dec_and_test(&mddev
->pending_writes
))
951 wake_up(&mddev
->sb_wait
);
952 rdev_dec_pending(rdev
, mddev
);
956 void md_super_write(struct mddev
*mddev
, struct md_rdev
*rdev
,
957 sector_t sector
, int size
, struct page
*page
)
959 /* write first size bytes of page to sector of rdev
960 * Increment mddev->pending_writes before returning
961 * and decrement it on completion, waking up sb_wait
962 * if zero is reached.
963 * If an error occurred, call md_error
970 if (test_bit(Faulty
, &rdev
->flags
))
973 bio
= bio_alloc_bioset(rdev
->meta_bdev
? rdev
->meta_bdev
: rdev
->bdev
,
975 REQ_OP_WRITE
| REQ_SYNC
| REQ_PREFLUSH
| REQ_FUA
,
976 GFP_NOIO
, &mddev
->sync_set
);
978 atomic_inc(&rdev
->nr_pending
);
980 bio
->bi_iter
.bi_sector
= sector
;
981 bio_add_page(bio
, page
, size
, 0);
982 bio
->bi_private
= rdev
;
983 bio
->bi_end_io
= super_written
;
985 if (test_bit(MD_FAILFAST_SUPPORTED
, &mddev
->flags
) &&
986 test_bit(FailFast
, &rdev
->flags
) &&
987 !test_bit(LastDev
, &rdev
->flags
))
988 bio
->bi_opf
|= MD_FAILFAST
;
990 atomic_inc(&mddev
->pending_writes
);
994 int md_super_wait(struct mddev
*mddev
)
996 /* wait for all superblock writes that were scheduled to complete */
997 wait_event(mddev
->sb_wait
, atomic_read(&mddev
->pending_writes
)==0);
998 if (test_and_clear_bit(MD_SB_NEED_REWRITE
, &mddev
->sb_flags
))
1003 int sync_page_io(struct md_rdev
*rdev
, sector_t sector
, int size
,
1004 struct page
*page
, blk_opf_t opf
, bool metadata_op
)
1007 struct bio_vec bvec
;
1009 if (metadata_op
&& rdev
->meta_bdev
)
1010 bio_init(&bio
, rdev
->meta_bdev
, &bvec
, 1, opf
);
1012 bio_init(&bio
, rdev
->bdev
, &bvec
, 1, opf
);
1015 bio
.bi_iter
.bi_sector
= sector
+ rdev
->sb_start
;
1016 else if (rdev
->mddev
->reshape_position
!= MaxSector
&&
1017 (rdev
->mddev
->reshape_backwards
==
1018 (sector
>= rdev
->mddev
->reshape_position
)))
1019 bio
.bi_iter
.bi_sector
= sector
+ rdev
->new_data_offset
;
1021 bio
.bi_iter
.bi_sector
= sector
+ rdev
->data_offset
;
1022 bio_add_page(&bio
, page
, size
, 0);
1024 submit_bio_wait(&bio
);
1026 return !bio
.bi_status
;
1028 EXPORT_SYMBOL_GPL(sync_page_io
);
1030 static int read_disk_sb(struct md_rdev
*rdev
, int size
)
1032 if (rdev
->sb_loaded
)
1035 if (!sync_page_io(rdev
, 0, size
, rdev
->sb_page
, REQ_OP_READ
, true))
1037 rdev
->sb_loaded
= 1;
1041 pr_err("md: disabled device %pg, could not read superblock.\n",
1046 static int md_uuid_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
1048 return sb1
->set_uuid0
== sb2
->set_uuid0
&&
1049 sb1
->set_uuid1
== sb2
->set_uuid1
&&
1050 sb1
->set_uuid2
== sb2
->set_uuid2
&&
1051 sb1
->set_uuid3
== sb2
->set_uuid3
;
1054 static int md_sb_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
1057 mdp_super_t
*tmp1
, *tmp2
;
1059 tmp1
= kmalloc(sizeof(*tmp1
),GFP_KERNEL
);
1060 tmp2
= kmalloc(sizeof(*tmp2
),GFP_KERNEL
);
1062 if (!tmp1
|| !tmp2
) {
1071 * nr_disks is not constant
1076 ret
= (memcmp(tmp1
, tmp2
, MD_SB_GENERIC_CONSTANT_WORDS
* 4) == 0);
1083 static u32
md_csum_fold(u32 csum
)
1085 csum
= (csum
& 0xffff) + (csum
>> 16);
1086 return (csum
& 0xffff) + (csum
>> 16);
1089 static unsigned int calc_sb_csum(mdp_super_t
*sb
)
1092 u32
*sb32
= (u32
*)sb
;
1094 unsigned int disk_csum
, csum
;
1096 disk_csum
= sb
->sb_csum
;
1099 for (i
= 0; i
< MD_SB_BYTES
/4 ; i
++)
1101 csum
= (newcsum
& 0xffffffff) + (newcsum
>>32);
1104 /* This used to use csum_partial, which was wrong for several
1105 * reasons including that different results are returned on
1106 * different architectures. It isn't critical that we get exactly
1107 * the same return value as before (we always csum_fold before
1108 * testing, and that removes any differences). However as we
1109 * know that csum_partial always returned a 16bit value on
1110 * alphas, do a fold to maximise conformity to previous behaviour.
1112 sb
->sb_csum
= md_csum_fold(disk_csum
);
1114 sb
->sb_csum
= disk_csum
;
1120 * Handle superblock details.
1121 * We want to be able to handle multiple superblock formats
1122 * so we have a common interface to them all, and an array of
1123 * different handlers.
1124 * We rely on user-space to write the initial superblock, and support
1125 * reading and updating of superblocks.
1126 * Interface methods are:
1127 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version)
1128 * loads and validates a superblock on dev.
1129 * if refdev != NULL, compare superblocks on both devices
1131 * 0 - dev has a superblock that is compatible with refdev
1132 * 1 - dev has a superblock that is compatible and newer than refdev
1133 * so dev should be used as the refdev in future
1134 * -EINVAL superblock incompatible or invalid
1135 * -othererror e.g. -EIO
1137 * int validate_super(struct mddev *mddev, struct md_rdev *dev)
1138 * Verify that dev is acceptable into mddev.
1139 * The first time, mddev->raid_disks will be 0, and data from
1140 * dev should be merged in. Subsequent calls check that dev
1141 * is new enough. Return 0 or -EINVAL
1143 * void sync_super(struct mddev *mddev, struct md_rdev *dev)
1144 * Update the superblock for rdev with data in mddev
1145 * This does not write to disc.
1151 struct module
*owner
;
1152 int (*load_super
)(struct md_rdev
*rdev
,
1153 struct md_rdev
*refdev
,
1155 int (*validate_super
)(struct mddev
*mddev
,
1156 struct md_rdev
*rdev
);
1157 void (*sync_super
)(struct mddev
*mddev
,
1158 struct md_rdev
*rdev
);
1159 unsigned long long (*rdev_size_change
)(struct md_rdev
*rdev
,
1160 sector_t num_sectors
);
1161 int (*allow_new_offset
)(struct md_rdev
*rdev
,
1162 unsigned long long new_offset
);
1166 * Check that the given mddev has no bitmap.
1168 * This function is called from the run method of all personalities that do not
1169 * support bitmaps. It prints an error message and returns non-zero if mddev
1170 * has a bitmap. Otherwise, it returns 0.
1173 int md_check_no_bitmap(struct mddev
*mddev
)
1175 if (!mddev
->bitmap_info
.file
&& !mddev
->bitmap_info
.offset
)
1177 pr_warn("%s: bitmaps are not supported for %s\n",
1178 mdname(mddev
), mddev
->pers
->name
);
1181 EXPORT_SYMBOL(md_check_no_bitmap
);
1184 * load_super for 0.90.0
1186 static int super_90_load(struct md_rdev
*rdev
, struct md_rdev
*refdev
, int minor_version
)
1190 bool spare_disk
= true;
1193 * Calculate the position of the superblock (512byte sectors),
1194 * it's at the end of the disk.
1196 * It also happens to be a multiple of 4Kb.
1198 rdev
->sb_start
= calc_dev_sboffset(rdev
);
1200 ret
= read_disk_sb(rdev
, MD_SB_BYTES
);
1206 sb
= page_address(rdev
->sb_page
);
1208 if (sb
->md_magic
!= MD_SB_MAGIC
) {
1209 pr_warn("md: invalid raid superblock magic on %pg\n",
1214 if (sb
->major_version
!= 0 ||
1215 sb
->minor_version
< 90 ||
1216 sb
->minor_version
> 91) {
1217 pr_warn("Bad version number %d.%d on %pg\n",
1218 sb
->major_version
, sb
->minor_version
, rdev
->bdev
);
1222 if (sb
->raid_disks
<= 0)
1225 if (md_csum_fold(calc_sb_csum(sb
)) != md_csum_fold(sb
->sb_csum
)) {
1226 pr_warn("md: invalid superblock checksum on %pg\n", rdev
->bdev
);
1230 rdev
->preferred_minor
= sb
->md_minor
;
1231 rdev
->data_offset
= 0;
1232 rdev
->new_data_offset
= 0;
1233 rdev
->sb_size
= MD_SB_BYTES
;
1234 rdev
->badblocks
.shift
= -1;
1236 if (sb
->level
== LEVEL_MULTIPATH
)
1239 rdev
->desc_nr
= sb
->this_disk
.number
;
1241 /* not spare disk, or LEVEL_MULTIPATH */
1242 if (sb
->level
== LEVEL_MULTIPATH
||
1243 (rdev
->desc_nr
>= 0 &&
1244 rdev
->desc_nr
< MD_SB_DISKS
&&
1245 sb
->disks
[rdev
->desc_nr
].state
&
1246 ((1<<MD_DISK_SYNC
) | (1 << MD_DISK_ACTIVE
))))
1256 mdp_super_t
*refsb
= page_address(refdev
->sb_page
);
1257 if (!md_uuid_equal(refsb
, sb
)) {
1258 pr_warn("md: %pg has different UUID to %pg\n",
1259 rdev
->bdev
, refdev
->bdev
);
1262 if (!md_sb_equal(refsb
, sb
)) {
1263 pr_warn("md: %pg has same UUID but different superblock to %pg\n",
1264 rdev
->bdev
, refdev
->bdev
);
1268 ev2
= md_event(refsb
);
1270 if (!spare_disk
&& ev1
> ev2
)
1275 rdev
->sectors
= rdev
->sb_start
;
1276 /* Limit to 4TB as metadata cannot record more than that.
1277 * (not needed for Linear and RAID0 as metadata doesn't
1280 if ((u64
)rdev
->sectors
>= (2ULL << 32) && sb
->level
>= 1)
1281 rdev
->sectors
= (sector_t
)(2ULL << 32) - 2;
1283 if (rdev
->sectors
< ((sector_t
)sb
->size
) * 2 && sb
->level
>= 1)
1284 /* "this cannot possibly happen" ... */
1292 * validate_super for 0.90.0
1294 static int super_90_validate(struct mddev
*mddev
, struct md_rdev
*rdev
)
1297 mdp_super_t
*sb
= page_address(rdev
->sb_page
);
1298 __u64 ev1
= md_event(sb
);
1300 rdev
->raid_disk
= -1;
1301 clear_bit(Faulty
, &rdev
->flags
);
1302 clear_bit(In_sync
, &rdev
->flags
);
1303 clear_bit(Bitmap_sync
, &rdev
->flags
);
1304 clear_bit(WriteMostly
, &rdev
->flags
);
1306 if (mddev
->raid_disks
== 0) {
1307 mddev
->major_version
= 0;
1308 mddev
->minor_version
= sb
->minor_version
;
1309 mddev
->patch_version
= sb
->patch_version
;
1310 mddev
->external
= 0;
1311 mddev
->chunk_sectors
= sb
->chunk_size
>> 9;
1312 mddev
->ctime
= sb
->ctime
;
1313 mddev
->utime
= sb
->utime
;
1314 mddev
->level
= sb
->level
;
1315 mddev
->clevel
[0] = 0;
1316 mddev
->layout
= sb
->layout
;
1317 mddev
->raid_disks
= sb
->raid_disks
;
1318 mddev
->dev_sectors
= ((sector_t
)sb
->size
) * 2;
1319 mddev
->events
= ev1
;
1320 mddev
->bitmap_info
.offset
= 0;
1321 mddev
->bitmap_info
.space
= 0;
1322 /* bitmap can use 60 K after the 4K superblocks */
1323 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
1324 mddev
->bitmap_info
.default_space
= 64*2 - (MD_SB_BYTES
>> 9);
1325 mddev
->reshape_backwards
= 0;
1327 if (mddev
->minor_version
>= 91) {
1328 mddev
->reshape_position
= sb
->reshape_position
;
1329 mddev
->delta_disks
= sb
->delta_disks
;
1330 mddev
->new_level
= sb
->new_level
;
1331 mddev
->new_layout
= sb
->new_layout
;
1332 mddev
->new_chunk_sectors
= sb
->new_chunk
>> 9;
1333 if (mddev
->delta_disks
< 0)
1334 mddev
->reshape_backwards
= 1;
1336 mddev
->reshape_position
= MaxSector
;
1337 mddev
->delta_disks
= 0;
1338 mddev
->new_level
= mddev
->level
;
1339 mddev
->new_layout
= mddev
->layout
;
1340 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1342 if (mddev
->level
== 0)
1345 if (sb
->state
& (1<<MD_SB_CLEAN
))
1346 mddev
->recovery_cp
= MaxSector
;
1348 if (sb
->events_hi
== sb
->cp_events_hi
&&
1349 sb
->events_lo
== sb
->cp_events_lo
) {
1350 mddev
->recovery_cp
= sb
->recovery_cp
;
1352 mddev
->recovery_cp
= 0;
1355 memcpy(mddev
->uuid
+0, &sb
->set_uuid0
, 4);
1356 memcpy(mddev
->uuid
+4, &sb
->set_uuid1
, 4);
1357 memcpy(mddev
->uuid
+8, &sb
->set_uuid2
, 4);
1358 memcpy(mddev
->uuid
+12,&sb
->set_uuid3
, 4);
1360 mddev
->max_disks
= MD_SB_DISKS
;
1362 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
) &&
1363 mddev
->bitmap_info
.file
== NULL
) {
1364 mddev
->bitmap_info
.offset
=
1365 mddev
->bitmap_info
.default_offset
;
1366 mddev
->bitmap_info
.space
=
1367 mddev
->bitmap_info
.default_space
;
1370 } else if (mddev
->pers
== NULL
) {
1371 /* Insist on good event counter while assembling, except
1372 * for spares (which don't need an event count) */
1374 if (sb
->disks
[rdev
->desc_nr
].state
& (
1375 (1<<MD_DISK_SYNC
) | (1 << MD_DISK_ACTIVE
)))
1376 if (ev1
< mddev
->events
)
1378 } else if (mddev
->bitmap
) {
1379 /* if adding to array with a bitmap, then we can accept an
1380 * older device ... but not too old.
1382 if (ev1
< mddev
->bitmap
->events_cleared
)
1384 if (ev1
< mddev
->events
)
1385 set_bit(Bitmap_sync
, &rdev
->flags
);
1387 if (ev1
< mddev
->events
)
1388 /* just a hot-add of a new device, leave raid_disk at -1 */
1392 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1393 desc
= sb
->disks
+ rdev
->desc_nr
;
1395 if (desc
->state
& (1<<MD_DISK_FAULTY
))
1396 set_bit(Faulty
, &rdev
->flags
);
1397 else if (desc
->state
& (1<<MD_DISK_SYNC
) /* &&
1398 desc->raid_disk < mddev->raid_disks */) {
1399 set_bit(In_sync
, &rdev
->flags
);
1400 rdev
->raid_disk
= desc
->raid_disk
;
1401 rdev
->saved_raid_disk
= desc
->raid_disk
;
1402 } else if (desc
->state
& (1<<MD_DISK_ACTIVE
)) {
1403 /* active but not in sync implies recovery up to
1404 * reshape position. We don't know exactly where
1405 * that is, so set to zero for now */
1406 if (mddev
->minor_version
>= 91) {
1407 rdev
->recovery_offset
= 0;
1408 rdev
->raid_disk
= desc
->raid_disk
;
1411 if (desc
->state
& (1<<MD_DISK_WRITEMOSTLY
))
1412 set_bit(WriteMostly
, &rdev
->flags
);
1413 if (desc
->state
& (1<<MD_DISK_FAILFAST
))
1414 set_bit(FailFast
, &rdev
->flags
);
1415 } else /* MULTIPATH are always insync */
1416 set_bit(In_sync
, &rdev
->flags
);
1421 * sync_super for 0.90.0
1423 static void super_90_sync(struct mddev
*mddev
, struct md_rdev
*rdev
)
1426 struct md_rdev
*rdev2
;
1427 int next_spare
= mddev
->raid_disks
;
1429 /* make rdev->sb match mddev data..
1432 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1433 * 3/ any empty disks < next_spare become removed
1435 * disks[0] gets initialised to REMOVED because
1436 * we cannot be sure from other fields if it has
1437 * been initialised or not.
1440 int active
=0, working
=0,failed
=0,spare
=0,nr_disks
=0;
1442 rdev
->sb_size
= MD_SB_BYTES
;
1444 sb
= page_address(rdev
->sb_page
);
1446 memset(sb
, 0, sizeof(*sb
));
1448 sb
->md_magic
= MD_SB_MAGIC
;
1449 sb
->major_version
= mddev
->major_version
;
1450 sb
->patch_version
= mddev
->patch_version
;
1451 sb
->gvalid_words
= 0; /* ignored */
1452 memcpy(&sb
->set_uuid0
, mddev
->uuid
+0, 4);
1453 memcpy(&sb
->set_uuid1
, mddev
->uuid
+4, 4);
1454 memcpy(&sb
->set_uuid2
, mddev
->uuid
+8, 4);
1455 memcpy(&sb
->set_uuid3
, mddev
->uuid
+12,4);
1457 sb
->ctime
= clamp_t(time64_t
, mddev
->ctime
, 0, U32_MAX
);
1458 sb
->level
= mddev
->level
;
1459 sb
->size
= mddev
->dev_sectors
/ 2;
1460 sb
->raid_disks
= mddev
->raid_disks
;
1461 sb
->md_minor
= mddev
->md_minor
;
1462 sb
->not_persistent
= 0;
1463 sb
->utime
= clamp_t(time64_t
, mddev
->utime
, 0, U32_MAX
);
1465 sb
->events_hi
= (mddev
->events
>>32);
1466 sb
->events_lo
= (u32
)mddev
->events
;
1468 if (mddev
->reshape_position
== MaxSector
)
1469 sb
->minor_version
= 90;
1471 sb
->minor_version
= 91;
1472 sb
->reshape_position
= mddev
->reshape_position
;
1473 sb
->new_level
= mddev
->new_level
;
1474 sb
->delta_disks
= mddev
->delta_disks
;
1475 sb
->new_layout
= mddev
->new_layout
;
1476 sb
->new_chunk
= mddev
->new_chunk_sectors
<< 9;
1478 mddev
->minor_version
= sb
->minor_version
;
1481 sb
->recovery_cp
= mddev
->recovery_cp
;
1482 sb
->cp_events_hi
= (mddev
->events
>>32);
1483 sb
->cp_events_lo
= (u32
)mddev
->events
;
1484 if (mddev
->recovery_cp
== MaxSector
)
1485 sb
->state
= (1<< MD_SB_CLEAN
);
1487 sb
->recovery_cp
= 0;
1489 sb
->layout
= mddev
->layout
;
1490 sb
->chunk_size
= mddev
->chunk_sectors
<< 9;
1492 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
)
1493 sb
->state
|= (1<<MD_SB_BITMAP_PRESENT
);
1495 sb
->disks
[0].state
= (1<<MD_DISK_REMOVED
);
1496 rdev_for_each(rdev2
, mddev
) {
1499 int is_active
= test_bit(In_sync
, &rdev2
->flags
);
1501 if (rdev2
->raid_disk
>= 0 &&
1502 sb
->minor_version
>= 91)
1503 /* we have nowhere to store the recovery_offset,
1504 * but if it is not below the reshape_position,
1505 * we can piggy-back on that.
1508 if (rdev2
->raid_disk
< 0 ||
1509 test_bit(Faulty
, &rdev2
->flags
))
1512 desc_nr
= rdev2
->raid_disk
;
1514 desc_nr
= next_spare
++;
1515 rdev2
->desc_nr
= desc_nr
;
1516 d
= &sb
->disks
[rdev2
->desc_nr
];
1518 d
->number
= rdev2
->desc_nr
;
1519 d
->major
= MAJOR(rdev2
->bdev
->bd_dev
);
1520 d
->minor
= MINOR(rdev2
->bdev
->bd_dev
);
1522 d
->raid_disk
= rdev2
->raid_disk
;
1524 d
->raid_disk
= rdev2
->desc_nr
; /* compatibility */
1525 if (test_bit(Faulty
, &rdev2
->flags
))
1526 d
->state
= (1<<MD_DISK_FAULTY
);
1527 else if (is_active
) {
1528 d
->state
= (1<<MD_DISK_ACTIVE
);
1529 if (test_bit(In_sync
, &rdev2
->flags
))
1530 d
->state
|= (1<<MD_DISK_SYNC
);
1538 if (test_bit(WriteMostly
, &rdev2
->flags
))
1539 d
->state
|= (1<<MD_DISK_WRITEMOSTLY
);
1540 if (test_bit(FailFast
, &rdev2
->flags
))
1541 d
->state
|= (1<<MD_DISK_FAILFAST
);
1543 /* now set the "removed" and "faulty" bits on any missing devices */
1544 for (i
=0 ; i
< mddev
->raid_disks
; i
++) {
1545 mdp_disk_t
*d
= &sb
->disks
[i
];
1546 if (d
->state
== 0 && d
->number
== 0) {
1549 d
->state
= (1<<MD_DISK_REMOVED
);
1550 d
->state
|= (1<<MD_DISK_FAULTY
);
1554 sb
->nr_disks
= nr_disks
;
1555 sb
->active_disks
= active
;
1556 sb
->working_disks
= working
;
1557 sb
->failed_disks
= failed
;
1558 sb
->spare_disks
= spare
;
1560 sb
->this_disk
= sb
->disks
[rdev
->desc_nr
];
1561 sb
->sb_csum
= calc_sb_csum(sb
);
1565 * rdev_size_change for 0.90.0
1567 static unsigned long long
1568 super_90_rdev_size_change(struct md_rdev
*rdev
, sector_t num_sectors
)
1570 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1571 return 0; /* component must fit device */
1572 if (rdev
->mddev
->bitmap_info
.offset
)
1573 return 0; /* can't move bitmap */
1574 rdev
->sb_start
= calc_dev_sboffset(rdev
);
1575 if (!num_sectors
|| num_sectors
> rdev
->sb_start
)
1576 num_sectors
= rdev
->sb_start
;
1577 /* Limit to 4TB as metadata cannot record more than that.
1578 * 4TB == 2^32 KB, or 2*2^32 sectors.
1580 if ((u64
)num_sectors
>= (2ULL << 32) && rdev
->mddev
->level
>= 1)
1581 num_sectors
= (sector_t
)(2ULL << 32) - 2;
1583 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1585 } while (md_super_wait(rdev
->mddev
) < 0);
1590 super_90_allow_new_offset(struct md_rdev
*rdev
, unsigned long long new_offset
)
1592 /* non-zero offset changes not possible with v0.90 */
1593 return new_offset
== 0;
1597 * version 1 superblock
1600 static __le32
calc_sb_1_csum(struct mdp_superblock_1
*sb
)
1604 unsigned long long newcsum
;
1605 int size
= 256 + le32_to_cpu(sb
->max_dev
)*2;
1606 __le32
*isuper
= (__le32
*)sb
;
1608 disk_csum
= sb
->sb_csum
;
1611 for (; size
>= 4; size
-= 4)
1612 newcsum
+= le32_to_cpu(*isuper
++);
1615 newcsum
+= le16_to_cpu(*(__le16
*) isuper
);
1617 csum
= (newcsum
& 0xffffffff) + (newcsum
>> 32);
1618 sb
->sb_csum
= disk_csum
;
1619 return cpu_to_le32(csum
);
1622 static int super_1_load(struct md_rdev
*rdev
, struct md_rdev
*refdev
, int minor_version
)
1624 struct mdp_superblock_1
*sb
;
1629 bool spare_disk
= true;
1632 * Calculate the position of the superblock in 512byte sectors.
1633 * It is always aligned to a 4K boundary and
1634 * depeding on minor_version, it can be:
1635 * 0: At least 8K, but less than 12K, from end of device
1636 * 1: At start of device
1637 * 2: 4K from start of device.
1639 switch(minor_version
) {
1641 sb_start
= bdev_nr_sectors(rdev
->bdev
) - 8 * 2;
1642 sb_start
&= ~(sector_t
)(4*2-1);
1653 rdev
->sb_start
= sb_start
;
1655 /* superblock is rarely larger than 1K, but it can be larger,
1656 * and it is safe to read 4k, so we do that
1658 ret
= read_disk_sb(rdev
, 4096);
1659 if (ret
) return ret
;
1661 sb
= page_address(rdev
->sb_page
);
1663 if (sb
->magic
!= cpu_to_le32(MD_SB_MAGIC
) ||
1664 sb
->major_version
!= cpu_to_le32(1) ||
1665 le32_to_cpu(sb
->max_dev
) > (4096-256)/2 ||
1666 le64_to_cpu(sb
->super_offset
) != rdev
->sb_start
||
1667 (le32_to_cpu(sb
->feature_map
) & ~MD_FEATURE_ALL
) != 0)
1670 if (calc_sb_1_csum(sb
) != sb
->sb_csum
) {
1671 pr_warn("md: invalid superblock checksum on %pg\n",
1675 if (le64_to_cpu(sb
->data_size
) < 10) {
1676 pr_warn("md: data_size too small on %pg\n",
1682 memcmp(sb
->pad3
, sb
->pad3
+1, sizeof(sb
->pad3
) - sizeof(sb
->pad3
[1])))
1683 /* Some padding is non-zero, might be a new feature */
1686 rdev
->preferred_minor
= 0xffff;
1687 rdev
->data_offset
= le64_to_cpu(sb
->data_offset
);
1688 rdev
->new_data_offset
= rdev
->data_offset
;
1689 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
) &&
1690 (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_NEW_OFFSET
))
1691 rdev
->new_data_offset
+= (s32
)le32_to_cpu(sb
->new_offset
);
1692 atomic_set(&rdev
->corrected_errors
, le32_to_cpu(sb
->cnt_corrected_read
));
1694 rdev
->sb_size
= le32_to_cpu(sb
->max_dev
) * 2 + 256;
1695 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1696 if (rdev
->sb_size
& bmask
)
1697 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1700 && rdev
->data_offset
< sb_start
+ (rdev
->sb_size
/512))
1703 && rdev
->new_data_offset
< sb_start
+ (rdev
->sb_size
/512))
1706 if (sb
->level
== cpu_to_le32(LEVEL_MULTIPATH
))
1709 rdev
->desc_nr
= le32_to_cpu(sb
->dev_number
);
1711 if (!rdev
->bb_page
) {
1712 rdev
->bb_page
= alloc_page(GFP_KERNEL
);
1716 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BAD_BLOCKS
) &&
1717 rdev
->badblocks
.count
== 0) {
1718 /* need to load the bad block list.
1719 * Currently we limit it to one page.
1725 int sectors
= le16_to_cpu(sb
->bblog_size
);
1726 if (sectors
> (PAGE_SIZE
/ 512))
1728 offset
= le32_to_cpu(sb
->bblog_offset
);
1731 bb_sector
= (long long)offset
;
1732 if (!sync_page_io(rdev
, bb_sector
, sectors
<< 9,
1733 rdev
->bb_page
, REQ_OP_READ
, true))
1735 bbp
= (__le64
*)page_address(rdev
->bb_page
);
1736 rdev
->badblocks
.shift
= sb
->bblog_shift
;
1737 for (i
= 0 ; i
< (sectors
<< (9-3)) ; i
++, bbp
++) {
1738 u64 bb
= le64_to_cpu(*bbp
);
1739 int count
= bb
& (0x3ff);
1740 u64 sector
= bb
>> 10;
1741 sector
<<= sb
->bblog_shift
;
1742 count
<<= sb
->bblog_shift
;
1745 if (badblocks_set(&rdev
->badblocks
, sector
, count
, 1))
1748 } else if (sb
->bblog_offset
!= 0)
1749 rdev
->badblocks
.shift
= 0;
1751 if ((le32_to_cpu(sb
->feature_map
) &
1752 (MD_FEATURE_PPL
| MD_FEATURE_MULTIPLE_PPLS
))) {
1753 rdev
->ppl
.offset
= (__s16
)le16_to_cpu(sb
->ppl
.offset
);
1754 rdev
->ppl
.size
= le16_to_cpu(sb
->ppl
.size
);
1755 rdev
->ppl
.sector
= rdev
->sb_start
+ rdev
->ppl
.offset
;
1758 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RAID0_LAYOUT
) &&
1762 /* not spare disk, or LEVEL_MULTIPATH */
1763 if (sb
->level
== cpu_to_le32(LEVEL_MULTIPATH
) ||
1764 (rdev
->desc_nr
>= 0 &&
1765 rdev
->desc_nr
< le32_to_cpu(sb
->max_dev
) &&
1766 (le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]) < MD_DISK_ROLE_MAX
||
1767 le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]) == MD_DISK_ROLE_JOURNAL
)))
1777 struct mdp_superblock_1
*refsb
= page_address(refdev
->sb_page
);
1779 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16) != 0 ||
1780 sb
->level
!= refsb
->level
||
1781 sb
->layout
!= refsb
->layout
||
1782 sb
->chunksize
!= refsb
->chunksize
) {
1783 pr_warn("md: %pg has strangely different superblock to %pg\n",
1788 ev1
= le64_to_cpu(sb
->events
);
1789 ev2
= le64_to_cpu(refsb
->events
);
1791 if (!spare_disk
&& ev1
> ev2
)
1797 sectors
= bdev_nr_sectors(rdev
->bdev
) - rdev
->data_offset
;
1799 sectors
= rdev
->sb_start
;
1800 if (sectors
< le64_to_cpu(sb
->data_size
))
1802 rdev
->sectors
= le64_to_cpu(sb
->data_size
);
1806 static int super_1_validate(struct mddev
*mddev
, struct md_rdev
*rdev
)
1808 struct mdp_superblock_1
*sb
= page_address(rdev
->sb_page
);
1809 __u64 ev1
= le64_to_cpu(sb
->events
);
1811 rdev
->raid_disk
= -1;
1812 clear_bit(Faulty
, &rdev
->flags
);
1813 clear_bit(In_sync
, &rdev
->flags
);
1814 clear_bit(Bitmap_sync
, &rdev
->flags
);
1815 clear_bit(WriteMostly
, &rdev
->flags
);
1817 if (mddev
->raid_disks
== 0) {
1818 mddev
->major_version
= 1;
1819 mddev
->patch_version
= 0;
1820 mddev
->external
= 0;
1821 mddev
->chunk_sectors
= le32_to_cpu(sb
->chunksize
);
1822 mddev
->ctime
= le64_to_cpu(sb
->ctime
);
1823 mddev
->utime
= le64_to_cpu(sb
->utime
);
1824 mddev
->level
= le32_to_cpu(sb
->level
);
1825 mddev
->clevel
[0] = 0;
1826 mddev
->layout
= le32_to_cpu(sb
->layout
);
1827 mddev
->raid_disks
= le32_to_cpu(sb
->raid_disks
);
1828 mddev
->dev_sectors
= le64_to_cpu(sb
->size
);
1829 mddev
->events
= ev1
;
1830 mddev
->bitmap_info
.offset
= 0;
1831 mddev
->bitmap_info
.space
= 0;
1832 /* Default location for bitmap is 1K after superblock
1833 * using 3K - total of 4K
1835 mddev
->bitmap_info
.default_offset
= 1024 >> 9;
1836 mddev
->bitmap_info
.default_space
= (4096-1024) >> 9;
1837 mddev
->reshape_backwards
= 0;
1839 mddev
->recovery_cp
= le64_to_cpu(sb
->resync_offset
);
1840 memcpy(mddev
->uuid
, sb
->set_uuid
, 16);
1842 mddev
->max_disks
= (4096-256)/2;
1844 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
) &&
1845 mddev
->bitmap_info
.file
== NULL
) {
1846 mddev
->bitmap_info
.offset
=
1847 (__s32
)le32_to_cpu(sb
->bitmap_offset
);
1848 /* Metadata doesn't record how much space is available.
1849 * For 1.0, we assume we can use up to the superblock
1850 * if before, else to 4K beyond superblock.
1851 * For others, assume no change is possible.
1853 if (mddev
->minor_version
> 0)
1854 mddev
->bitmap_info
.space
= 0;
1855 else if (mddev
->bitmap_info
.offset
> 0)
1856 mddev
->bitmap_info
.space
=
1857 8 - mddev
->bitmap_info
.offset
;
1859 mddev
->bitmap_info
.space
=
1860 -mddev
->bitmap_info
.offset
;
1863 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
1864 mddev
->reshape_position
= le64_to_cpu(sb
->reshape_position
);
1865 mddev
->delta_disks
= le32_to_cpu(sb
->delta_disks
);
1866 mddev
->new_level
= le32_to_cpu(sb
->new_level
);
1867 mddev
->new_layout
= le32_to_cpu(sb
->new_layout
);
1868 mddev
->new_chunk_sectors
= le32_to_cpu(sb
->new_chunk
);
1869 if (mddev
->delta_disks
< 0 ||
1870 (mddev
->delta_disks
== 0 &&
1871 (le32_to_cpu(sb
->feature_map
)
1872 & MD_FEATURE_RESHAPE_BACKWARDS
)))
1873 mddev
->reshape_backwards
= 1;
1875 mddev
->reshape_position
= MaxSector
;
1876 mddev
->delta_disks
= 0;
1877 mddev
->new_level
= mddev
->level
;
1878 mddev
->new_layout
= mddev
->layout
;
1879 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1882 if (mddev
->level
== 0 &&
1883 !(le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RAID0_LAYOUT
))
1886 if (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_JOURNAL
)
1887 set_bit(MD_HAS_JOURNAL
, &mddev
->flags
);
1889 if (le32_to_cpu(sb
->feature_map
) &
1890 (MD_FEATURE_PPL
| MD_FEATURE_MULTIPLE_PPLS
)) {
1891 if (le32_to_cpu(sb
->feature_map
) &
1892 (MD_FEATURE_BITMAP_OFFSET
| MD_FEATURE_JOURNAL
))
1894 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_PPL
) &&
1895 (le32_to_cpu(sb
->feature_map
) &
1896 MD_FEATURE_MULTIPLE_PPLS
))
1898 set_bit(MD_HAS_PPL
, &mddev
->flags
);
1900 } else if (mddev
->pers
== NULL
) {
1901 /* Insist of good event counter while assembling, except for
1902 * spares (which don't need an event count) */
1904 if (rdev
->desc_nr
>= 0 &&
1905 rdev
->desc_nr
< le32_to_cpu(sb
->max_dev
) &&
1906 (le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]) < MD_DISK_ROLE_MAX
||
1907 le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]) == MD_DISK_ROLE_JOURNAL
))
1908 if (ev1
< mddev
->events
)
1910 } else if (mddev
->bitmap
) {
1911 /* If adding to array with a bitmap, then we can accept an
1912 * older device, but not too old.
1914 if (ev1
< mddev
->bitmap
->events_cleared
)
1916 if (ev1
< mddev
->events
)
1917 set_bit(Bitmap_sync
, &rdev
->flags
);
1919 if (ev1
< mddev
->events
)
1920 /* just a hot-add of a new device, leave raid_disk at -1 */
1923 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1925 if (rdev
->desc_nr
< 0 ||
1926 rdev
->desc_nr
>= le32_to_cpu(sb
->max_dev
)) {
1927 role
= MD_DISK_ROLE_SPARE
;
1930 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
1932 case MD_DISK_ROLE_SPARE
: /* spare */
1934 case MD_DISK_ROLE_FAULTY
: /* faulty */
1935 set_bit(Faulty
, &rdev
->flags
);
1937 case MD_DISK_ROLE_JOURNAL
: /* journal device */
1938 if (!(le32_to_cpu(sb
->feature_map
) & MD_FEATURE_JOURNAL
)) {
1939 /* journal device without journal feature */
1940 pr_warn("md: journal device provided without journal feature, ignoring the device\n");
1943 set_bit(Journal
, &rdev
->flags
);
1944 rdev
->journal_tail
= le64_to_cpu(sb
->journal_tail
);
1945 rdev
->raid_disk
= 0;
1948 rdev
->saved_raid_disk
= role
;
1949 if ((le32_to_cpu(sb
->feature_map
) &
1950 MD_FEATURE_RECOVERY_OFFSET
)) {
1951 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
1952 if (!(le32_to_cpu(sb
->feature_map
) &
1953 MD_FEATURE_RECOVERY_BITMAP
))
1954 rdev
->saved_raid_disk
= -1;
1957 * If the array is FROZEN, then the device can't
1958 * be in_sync with rest of array.
1960 if (!test_bit(MD_RECOVERY_FROZEN
,
1962 set_bit(In_sync
, &rdev
->flags
);
1964 rdev
->raid_disk
= role
;
1967 if (sb
->devflags
& WriteMostly1
)
1968 set_bit(WriteMostly
, &rdev
->flags
);
1969 if (sb
->devflags
& FailFast1
)
1970 set_bit(FailFast
, &rdev
->flags
);
1971 if (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_REPLACEMENT
)
1972 set_bit(Replacement
, &rdev
->flags
);
1973 } else /* MULTIPATH are always insync */
1974 set_bit(In_sync
, &rdev
->flags
);
1979 static void super_1_sync(struct mddev
*mddev
, struct md_rdev
*rdev
)
1981 struct mdp_superblock_1
*sb
;
1982 struct md_rdev
*rdev2
;
1984 /* make rdev->sb match mddev and rdev data. */
1986 sb
= page_address(rdev
->sb_page
);
1988 sb
->feature_map
= 0;
1990 sb
->recovery_offset
= cpu_to_le64(0);
1991 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
1993 sb
->utime
= cpu_to_le64((__u64
)mddev
->utime
);
1994 sb
->events
= cpu_to_le64(mddev
->events
);
1996 sb
->resync_offset
= cpu_to_le64(mddev
->recovery_cp
);
1997 else if (test_bit(MD_JOURNAL_CLEAN
, &mddev
->flags
))
1998 sb
->resync_offset
= cpu_to_le64(MaxSector
);
2000 sb
->resync_offset
= cpu_to_le64(0);
2002 sb
->cnt_corrected_read
= cpu_to_le32(atomic_read(&rdev
->corrected_errors
));
2004 sb
->raid_disks
= cpu_to_le32(mddev
->raid_disks
);
2005 sb
->size
= cpu_to_le64(mddev
->dev_sectors
);
2006 sb
->chunksize
= cpu_to_le32(mddev
->chunk_sectors
);
2007 sb
->level
= cpu_to_le32(mddev
->level
);
2008 sb
->layout
= cpu_to_le32(mddev
->layout
);
2009 if (test_bit(FailFast
, &rdev
->flags
))
2010 sb
->devflags
|= FailFast1
;
2012 sb
->devflags
&= ~FailFast1
;
2014 if (test_bit(WriteMostly
, &rdev
->flags
))
2015 sb
->devflags
|= WriteMostly1
;
2017 sb
->devflags
&= ~WriteMostly1
;
2018 sb
->data_offset
= cpu_to_le64(rdev
->data_offset
);
2019 sb
->data_size
= cpu_to_le64(rdev
->sectors
);
2021 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
) {
2022 sb
->bitmap_offset
= cpu_to_le32((__u32
)mddev
->bitmap_info
.offset
);
2023 sb
->feature_map
= cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
);
2026 if (rdev
->raid_disk
>= 0 && !test_bit(Journal
, &rdev
->flags
) &&
2027 !test_bit(In_sync
, &rdev
->flags
)) {
2029 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET
);
2030 sb
->recovery_offset
=
2031 cpu_to_le64(rdev
->recovery_offset
);
2032 if (rdev
->saved_raid_disk
>= 0 && mddev
->bitmap
)
2034 cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP
);
2036 /* Note: recovery_offset and journal_tail share space */
2037 if (test_bit(Journal
, &rdev
->flags
))
2038 sb
->journal_tail
= cpu_to_le64(rdev
->journal_tail
);
2039 if (test_bit(Replacement
, &rdev
->flags
))
2041 cpu_to_le32(MD_FEATURE_REPLACEMENT
);
2043 if (mddev
->reshape_position
!= MaxSector
) {
2044 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE
);
2045 sb
->reshape_position
= cpu_to_le64(mddev
->reshape_position
);
2046 sb
->new_layout
= cpu_to_le32(mddev
->new_layout
);
2047 sb
->delta_disks
= cpu_to_le32(mddev
->delta_disks
);
2048 sb
->new_level
= cpu_to_le32(mddev
->new_level
);
2049 sb
->new_chunk
= cpu_to_le32(mddev
->new_chunk_sectors
);
2050 if (mddev
->delta_disks
== 0 &&
2051 mddev
->reshape_backwards
)
2053 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS
);
2054 if (rdev
->new_data_offset
!= rdev
->data_offset
) {
2056 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET
);
2057 sb
->new_offset
= cpu_to_le32((__u32
)(rdev
->new_data_offset
2058 - rdev
->data_offset
));
2062 if (mddev_is_clustered(mddev
))
2063 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_CLUSTERED
);
2065 if (rdev
->badblocks
.count
== 0)
2066 /* Nothing to do for bad blocks*/ ;
2067 else if (sb
->bblog_offset
== 0)
2068 /* Cannot record bad blocks on this device */
2069 md_error(mddev
, rdev
);
2071 struct badblocks
*bb
= &rdev
->badblocks
;
2072 __le64
*bbp
= (__le64
*)page_address(rdev
->bb_page
);
2074 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_BAD_BLOCKS
);
2079 seq
= read_seqbegin(&bb
->lock
);
2081 memset(bbp
, 0xff, PAGE_SIZE
);
2083 for (i
= 0 ; i
< bb
->count
; i
++) {
2084 u64 internal_bb
= p
[i
];
2085 u64 store_bb
= ((BB_OFFSET(internal_bb
) << 10)
2086 | BB_LEN(internal_bb
));
2087 bbp
[i
] = cpu_to_le64(store_bb
);
2090 if (read_seqretry(&bb
->lock
, seq
))
2093 bb
->sector
= (rdev
->sb_start
+
2094 (int)le32_to_cpu(sb
->bblog_offset
));
2095 bb
->size
= le16_to_cpu(sb
->bblog_size
);
2100 rdev_for_each(rdev2
, mddev
)
2101 if (rdev2
->desc_nr
+1 > max_dev
)
2102 max_dev
= rdev2
->desc_nr
+1;
2104 if (max_dev
> le32_to_cpu(sb
->max_dev
)) {
2106 sb
->max_dev
= cpu_to_le32(max_dev
);
2107 rdev
->sb_size
= max_dev
* 2 + 256;
2108 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
2109 if (rdev
->sb_size
& bmask
)
2110 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
2112 max_dev
= le32_to_cpu(sb
->max_dev
);
2114 for (i
=0; i
<max_dev
;i
++)
2115 sb
->dev_roles
[i
] = cpu_to_le16(MD_DISK_ROLE_SPARE
);
2117 if (test_bit(MD_HAS_JOURNAL
, &mddev
->flags
))
2118 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_JOURNAL
);
2120 if (test_bit(MD_HAS_PPL
, &mddev
->flags
)) {
2121 if (test_bit(MD_HAS_MULTIPLE_PPLS
, &mddev
->flags
))
2123 cpu_to_le32(MD_FEATURE_MULTIPLE_PPLS
);
2125 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_PPL
);
2126 sb
->ppl
.offset
= cpu_to_le16(rdev
->ppl
.offset
);
2127 sb
->ppl
.size
= cpu_to_le16(rdev
->ppl
.size
);
2130 rdev_for_each(rdev2
, mddev
) {
2132 if (test_bit(Faulty
, &rdev2
->flags
))
2133 sb
->dev_roles
[i
] = cpu_to_le16(MD_DISK_ROLE_FAULTY
);
2134 else if (test_bit(In_sync
, &rdev2
->flags
))
2135 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
2136 else if (test_bit(Journal
, &rdev2
->flags
))
2137 sb
->dev_roles
[i
] = cpu_to_le16(MD_DISK_ROLE_JOURNAL
);
2138 else if (rdev2
->raid_disk
>= 0)
2139 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
2141 sb
->dev_roles
[i
] = cpu_to_le16(MD_DISK_ROLE_SPARE
);
2144 sb
->sb_csum
= calc_sb_1_csum(sb
);
2147 static sector_t
super_1_choose_bm_space(sector_t dev_size
)
2151 /* if the device is bigger than 8Gig, save 64k for bitmap
2152 * usage, if bigger than 200Gig, save 128k
2154 if (dev_size
< 64*2)
2156 else if (dev_size
- 64*2 >= 200*1024*1024*2)
2158 else if (dev_size
- 4*2 > 8*1024*1024*2)
2165 static unsigned long long
2166 super_1_rdev_size_change(struct md_rdev
*rdev
, sector_t num_sectors
)
2168 struct mdp_superblock_1
*sb
;
2169 sector_t max_sectors
;
2170 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
2171 return 0; /* component must fit device */
2172 if (rdev
->data_offset
!= rdev
->new_data_offset
)
2173 return 0; /* too confusing */
2174 if (rdev
->sb_start
< rdev
->data_offset
) {
2175 /* minor versions 1 and 2; superblock before data */
2176 max_sectors
= bdev_nr_sectors(rdev
->bdev
) - rdev
->data_offset
;
2177 if (!num_sectors
|| num_sectors
> max_sectors
)
2178 num_sectors
= max_sectors
;
2179 } else if (rdev
->mddev
->bitmap_info
.offset
) {
2180 /* minor version 0 with bitmap we can't move */
2183 /* minor version 0; superblock after data */
2184 sector_t sb_start
, bm_space
;
2185 sector_t dev_size
= bdev_nr_sectors(rdev
->bdev
);
2187 /* 8K is for superblock */
2188 sb_start
= dev_size
- 8*2;
2189 sb_start
&= ~(sector_t
)(4*2 - 1);
2191 bm_space
= super_1_choose_bm_space(dev_size
);
2193 /* Space that can be used to store date needs to decrease
2194 * superblock bitmap space and bad block space(4K)
2196 max_sectors
= sb_start
- bm_space
- 4*2;
2198 if (!num_sectors
|| num_sectors
> max_sectors
)
2199 num_sectors
= max_sectors
;
2200 rdev
->sb_start
= sb_start
;
2202 sb
= page_address(rdev
->sb_page
);
2203 sb
->data_size
= cpu_to_le64(num_sectors
);
2204 sb
->super_offset
= cpu_to_le64(rdev
->sb_start
);
2205 sb
->sb_csum
= calc_sb_1_csum(sb
);
2207 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
2209 } while (md_super_wait(rdev
->mddev
) < 0);
2215 super_1_allow_new_offset(struct md_rdev
*rdev
,
2216 unsigned long long new_offset
)
2218 /* All necessary checks on new >= old have been done */
2219 struct bitmap
*bitmap
;
2220 if (new_offset
>= rdev
->data_offset
)
2223 /* with 1.0 metadata, there is no metadata to tread on
2224 * so we can always move back */
2225 if (rdev
->mddev
->minor_version
== 0)
2228 /* otherwise we must be sure not to step on
2229 * any metadata, so stay:
2230 * 36K beyond start of superblock
2231 * beyond end of badblocks
2232 * beyond write-intent bitmap
2234 if (rdev
->sb_start
+ (32+4)*2 > new_offset
)
2236 bitmap
= rdev
->mddev
->bitmap
;
2237 if (bitmap
&& !rdev
->mddev
->bitmap_info
.file
&&
2238 rdev
->sb_start
+ rdev
->mddev
->bitmap_info
.offset
+
2239 bitmap
->storage
.file_pages
* (PAGE_SIZE
>>9) > new_offset
)
2241 if (rdev
->badblocks
.sector
+ rdev
->badblocks
.size
> new_offset
)
2247 static struct super_type super_types
[] = {
2250 .owner
= THIS_MODULE
,
2251 .load_super
= super_90_load
,
2252 .validate_super
= super_90_validate
,
2253 .sync_super
= super_90_sync
,
2254 .rdev_size_change
= super_90_rdev_size_change
,
2255 .allow_new_offset
= super_90_allow_new_offset
,
2259 .owner
= THIS_MODULE
,
2260 .load_super
= super_1_load
,
2261 .validate_super
= super_1_validate
,
2262 .sync_super
= super_1_sync
,
2263 .rdev_size_change
= super_1_rdev_size_change
,
2264 .allow_new_offset
= super_1_allow_new_offset
,
2268 static void sync_super(struct mddev
*mddev
, struct md_rdev
*rdev
)
2270 if (mddev
->sync_super
) {
2271 mddev
->sync_super(mddev
, rdev
);
2275 BUG_ON(mddev
->major_version
>= ARRAY_SIZE(super_types
));
2277 super_types
[mddev
->major_version
].sync_super(mddev
, rdev
);
2280 static int match_mddev_units(struct mddev
*mddev1
, struct mddev
*mddev2
)
2282 struct md_rdev
*rdev
, *rdev2
;
2285 rdev_for_each_rcu(rdev
, mddev1
) {
2286 if (test_bit(Faulty
, &rdev
->flags
) ||
2287 test_bit(Journal
, &rdev
->flags
) ||
2288 rdev
->raid_disk
== -1)
2290 rdev_for_each_rcu(rdev2
, mddev2
) {
2291 if (test_bit(Faulty
, &rdev2
->flags
) ||
2292 test_bit(Journal
, &rdev2
->flags
) ||
2293 rdev2
->raid_disk
== -1)
2295 if (rdev
->bdev
->bd_disk
== rdev2
->bdev
->bd_disk
) {
2305 static LIST_HEAD(pending_raid_disks
);
2308 * Try to register data integrity profile for an mddev
2310 * This is called when an array is started and after a disk has been kicked
2311 * from the array. It only succeeds if all working and active component devices
2312 * are integrity capable with matching profiles.
2314 int md_integrity_register(struct mddev
*mddev
)
2316 struct md_rdev
*rdev
, *reference
= NULL
;
2318 if (list_empty(&mddev
->disks
))
2319 return 0; /* nothing to do */
2320 if (!mddev
->gendisk
|| blk_get_integrity(mddev
->gendisk
))
2321 return 0; /* shouldn't register, or already is */
2322 rdev_for_each(rdev
, mddev
) {
2323 /* skip spares and non-functional disks */
2324 if (test_bit(Faulty
, &rdev
->flags
))
2326 if (rdev
->raid_disk
< 0)
2329 /* Use the first rdev as the reference */
2333 /* does this rdev's profile match the reference profile? */
2334 if (blk_integrity_compare(reference
->bdev
->bd_disk
,
2335 rdev
->bdev
->bd_disk
) < 0)
2338 if (!reference
|| !bdev_get_integrity(reference
->bdev
))
2341 * All component devices are integrity capable and have matching
2342 * profiles, register the common profile for the md device.
2344 blk_integrity_register(mddev
->gendisk
,
2345 bdev_get_integrity(reference
->bdev
));
2347 pr_debug("md: data integrity enabled on %s\n", mdname(mddev
));
2348 if (bioset_integrity_create(&mddev
->bio_set
, BIO_POOL_SIZE
) ||
2349 (mddev
->level
!= 1 && mddev
->level
!= 10 &&
2350 bioset_integrity_create(&mddev
->io_acct_set
, BIO_POOL_SIZE
))) {
2352 * No need to handle the failure of bioset_integrity_create,
2353 * because the function is called by md_run() -> pers->run(),
2354 * md_run calls bioset_exit -> bioset_integrity_free in case
2357 pr_err("md: failed to create integrity pool for %s\n",
2363 EXPORT_SYMBOL(md_integrity_register
);
2366 * Attempt to add an rdev, but only if it is consistent with the current
2369 int md_integrity_add_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
2371 struct blk_integrity
*bi_mddev
;
2373 if (!mddev
->gendisk
)
2376 bi_mddev
= blk_get_integrity(mddev
->gendisk
);
2378 if (!bi_mddev
) /* nothing to do */
2381 if (blk_integrity_compare(mddev
->gendisk
, rdev
->bdev
->bd_disk
) != 0) {
2382 pr_err("%s: incompatible integrity profile for %pg\n",
2383 mdname(mddev
), rdev
->bdev
);
2389 EXPORT_SYMBOL(md_integrity_add_rdev
);
2391 static bool rdev_read_only(struct md_rdev
*rdev
)
2393 return bdev_read_only(rdev
->bdev
) ||
2394 (rdev
->meta_bdev
&& bdev_read_only(rdev
->meta_bdev
));
2397 static int bind_rdev_to_array(struct md_rdev
*rdev
, struct mddev
*mddev
)
2399 char b
[BDEVNAME_SIZE
];
2402 /* prevent duplicates */
2403 if (find_rdev(mddev
, rdev
->bdev
->bd_dev
))
2406 if (rdev_read_only(rdev
) && mddev
->pers
)
2409 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2410 if (!test_bit(Journal
, &rdev
->flags
) &&
2412 (mddev
->dev_sectors
== 0 || rdev
->sectors
< mddev
->dev_sectors
)) {
2414 /* Cannot change size, so fail
2415 * If mddev->level <= 0, then we don't care
2416 * about aligning sizes (e.g. linear)
2418 if (mddev
->level
> 0)
2421 mddev
->dev_sectors
= rdev
->sectors
;
2424 /* Verify rdev->desc_nr is unique.
2425 * If it is -1, assign a free number, else
2426 * check number is not in use
2429 if (rdev
->desc_nr
< 0) {
2432 choice
= mddev
->raid_disks
;
2433 while (md_find_rdev_nr_rcu(mddev
, choice
))
2435 rdev
->desc_nr
= choice
;
2437 if (md_find_rdev_nr_rcu(mddev
, rdev
->desc_nr
)) {
2443 if (!test_bit(Journal
, &rdev
->flags
) &&
2444 mddev
->max_disks
&& rdev
->desc_nr
>= mddev
->max_disks
) {
2445 pr_warn("md: %s: array is limited to %d devices\n",
2446 mdname(mddev
), mddev
->max_disks
);
2449 snprintf(b
, sizeof(b
), "%pg", rdev
->bdev
);
2450 strreplace(b
, '/', '!');
2452 rdev
->mddev
= mddev
;
2453 pr_debug("md: bind<%s>\n", b
);
2455 if (mddev
->raid_disks
)
2456 mddev_create_serial_pool(mddev
, rdev
, false);
2458 if ((err
= kobject_add(&rdev
->kobj
, &mddev
->kobj
, "dev-%s", b
)))
2461 /* failure here is OK */
2462 err
= sysfs_create_link(&rdev
->kobj
, bdev_kobj(rdev
->bdev
), "block");
2463 rdev
->sysfs_state
= sysfs_get_dirent_safe(rdev
->kobj
.sd
, "state");
2464 rdev
->sysfs_unack_badblocks
=
2465 sysfs_get_dirent_safe(rdev
->kobj
.sd
, "unacknowledged_bad_blocks");
2466 rdev
->sysfs_badblocks
=
2467 sysfs_get_dirent_safe(rdev
->kobj
.sd
, "bad_blocks");
2469 list_add_rcu(&rdev
->same_set
, &mddev
->disks
);
2470 bd_link_disk_holder(rdev
->bdev
, mddev
->gendisk
);
2472 /* May as well allow recovery to be retried once */
2473 mddev
->recovery_disabled
++;
2478 pr_warn("md: failed to register dev-%s for %s\n",
2483 static void rdev_delayed_delete(struct work_struct
*ws
)
2485 struct md_rdev
*rdev
= container_of(ws
, struct md_rdev
, del_work
);
2486 kobject_del(&rdev
->kobj
);
2487 kobject_put(&rdev
->kobj
);
2490 static void unbind_rdev_from_array(struct md_rdev
*rdev
)
2492 bd_unlink_disk_holder(rdev
->bdev
, rdev
->mddev
->gendisk
);
2493 list_del_rcu(&rdev
->same_set
);
2494 pr_debug("md: unbind<%pg>\n", rdev
->bdev
);
2495 mddev_destroy_serial_pool(rdev
->mddev
, rdev
, false);
2497 sysfs_remove_link(&rdev
->kobj
, "block");
2498 sysfs_put(rdev
->sysfs_state
);
2499 sysfs_put(rdev
->sysfs_unack_badblocks
);
2500 sysfs_put(rdev
->sysfs_badblocks
);
2501 rdev
->sysfs_state
= NULL
;
2502 rdev
->sysfs_unack_badblocks
= NULL
;
2503 rdev
->sysfs_badblocks
= NULL
;
2504 rdev
->badblocks
.count
= 0;
2505 /* We need to delay this, otherwise we can deadlock when
2506 * writing to 'remove' to "dev/state". We also need
2507 * to delay it due to rcu usage.
2510 INIT_WORK(&rdev
->del_work
, rdev_delayed_delete
);
2511 kobject_get(&rdev
->kobj
);
2512 queue_work(md_rdev_misc_wq
, &rdev
->del_work
);
2516 * prevent the device from being mounted, repartitioned or
2517 * otherwise reused by a RAID array (or any other kernel
2518 * subsystem), by bd_claiming the device.
2520 static int lock_rdev(struct md_rdev
*rdev
, dev_t dev
, int shared
)
2523 struct block_device
*bdev
;
2525 bdev
= blkdev_get_by_dev(dev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
,
2526 shared
? (struct md_rdev
*)lock_rdev
: rdev
);
2528 pr_warn("md: could not open device unknown-block(%u,%u).\n",
2529 MAJOR(dev
), MINOR(dev
));
2530 return PTR_ERR(bdev
);
2536 static void unlock_rdev(struct md_rdev
*rdev
)
2538 struct block_device
*bdev
= rdev
->bdev
;
2540 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
);
2543 void md_autodetect_dev(dev_t dev
);
2545 static void export_rdev(struct md_rdev
*rdev
)
2547 pr_debug("md: export_rdev(%pg)\n", rdev
->bdev
);
2548 md_rdev_clear(rdev
);
2550 if (test_bit(AutoDetected
, &rdev
->flags
))
2551 md_autodetect_dev(rdev
->bdev
->bd_dev
);
2554 kobject_put(&rdev
->kobj
);
2557 void md_kick_rdev_from_array(struct md_rdev
*rdev
)
2559 unbind_rdev_from_array(rdev
);
2562 EXPORT_SYMBOL_GPL(md_kick_rdev_from_array
);
2564 static void export_array(struct mddev
*mddev
)
2566 struct md_rdev
*rdev
;
2568 while (!list_empty(&mddev
->disks
)) {
2569 rdev
= list_first_entry(&mddev
->disks
, struct md_rdev
,
2571 md_kick_rdev_from_array(rdev
);
2573 mddev
->raid_disks
= 0;
2574 mddev
->major_version
= 0;
2577 static bool set_in_sync(struct mddev
*mddev
)
2579 lockdep_assert_held(&mddev
->lock
);
2580 if (!mddev
->in_sync
) {
2581 mddev
->sync_checkers
++;
2582 spin_unlock(&mddev
->lock
);
2583 percpu_ref_switch_to_atomic_sync(&mddev
->writes_pending
);
2584 spin_lock(&mddev
->lock
);
2585 if (!mddev
->in_sync
&&
2586 percpu_ref_is_zero(&mddev
->writes_pending
)) {
2589 * Ensure ->in_sync is visible before we clear
2593 set_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
2594 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
2596 if (--mddev
->sync_checkers
== 0)
2597 percpu_ref_switch_to_percpu(&mddev
->writes_pending
);
2599 if (mddev
->safemode
== 1)
2600 mddev
->safemode
= 0;
2601 return mddev
->in_sync
;
2604 static void sync_sbs(struct mddev
*mddev
, int nospares
)
2606 /* Update each superblock (in-memory image), but
2607 * if we are allowed to, skip spares which already
2608 * have the right event counter, or have one earlier
2609 * (which would mean they aren't being marked as dirty
2610 * with the rest of the array)
2612 struct md_rdev
*rdev
;
2613 rdev_for_each(rdev
, mddev
) {
2614 if (rdev
->sb_events
== mddev
->events
||
2616 rdev
->raid_disk
< 0 &&
2617 rdev
->sb_events
+1 == mddev
->events
)) {
2618 /* Don't update this superblock */
2619 rdev
->sb_loaded
= 2;
2621 sync_super(mddev
, rdev
);
2622 rdev
->sb_loaded
= 1;
2627 static bool does_sb_need_changing(struct mddev
*mddev
)
2629 struct md_rdev
*rdev
= NULL
, *iter
;
2630 struct mdp_superblock_1
*sb
;
2633 /* Find a good rdev */
2634 rdev_for_each(iter
, mddev
)
2635 if ((iter
->raid_disk
>= 0) && !test_bit(Faulty
, &iter
->flags
)) {
2640 /* No good device found. */
2644 sb
= page_address(rdev
->sb_page
);
2645 /* Check if a device has become faulty or a spare become active */
2646 rdev_for_each(rdev
, mddev
) {
2647 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
2648 /* Device activated? */
2649 if (role
== MD_DISK_ROLE_SPARE
&& rdev
->raid_disk
>= 0 &&
2650 !test_bit(Faulty
, &rdev
->flags
))
2652 /* Device turned faulty? */
2653 if (test_bit(Faulty
, &rdev
->flags
) && (role
< MD_DISK_ROLE_MAX
))
2657 /* Check if any mddev parameters have changed */
2658 if ((mddev
->dev_sectors
!= le64_to_cpu(sb
->size
)) ||
2659 (mddev
->reshape_position
!= le64_to_cpu(sb
->reshape_position
)) ||
2660 (mddev
->layout
!= le32_to_cpu(sb
->layout
)) ||
2661 (mddev
->raid_disks
!= le32_to_cpu(sb
->raid_disks
)) ||
2662 (mddev
->chunk_sectors
!= le32_to_cpu(sb
->chunksize
)))
2668 void md_update_sb(struct mddev
*mddev
, int force_change
)
2670 struct md_rdev
*rdev
;
2673 int any_badblocks_changed
= 0;
2678 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
2683 if (mddev_is_clustered(mddev
)) {
2684 if (test_and_clear_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
))
2686 if (test_and_clear_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
))
2688 ret
= md_cluster_ops
->metadata_update_start(mddev
);
2689 /* Has someone else has updated the sb */
2690 if (!does_sb_need_changing(mddev
)) {
2692 md_cluster_ops
->metadata_update_cancel(mddev
);
2693 bit_clear_unless(&mddev
->sb_flags
, BIT(MD_SB_CHANGE_PENDING
),
2694 BIT(MD_SB_CHANGE_DEVS
) |
2695 BIT(MD_SB_CHANGE_CLEAN
));
2701 * First make sure individual recovery_offsets are correct
2702 * curr_resync_completed can only be used during recovery.
2703 * During reshape/resync it might use array-addresses rather
2704 * that device addresses.
2706 rdev_for_each(rdev
, mddev
) {
2707 if (rdev
->raid_disk
>= 0 &&
2708 mddev
->delta_disks
>= 0 &&
2709 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
2710 test_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
) &&
2711 !test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
2712 !test_bit(Journal
, &rdev
->flags
) &&
2713 !test_bit(In_sync
, &rdev
->flags
) &&
2714 mddev
->curr_resync_completed
> rdev
->recovery_offset
)
2715 rdev
->recovery_offset
= mddev
->curr_resync_completed
;
2718 if (!mddev
->persistent
) {
2719 clear_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
2720 clear_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
2721 if (!mddev
->external
) {
2722 clear_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
2723 rdev_for_each(rdev
, mddev
) {
2724 if (rdev
->badblocks
.changed
) {
2725 rdev
->badblocks
.changed
= 0;
2726 ack_all_badblocks(&rdev
->badblocks
);
2727 md_error(mddev
, rdev
);
2729 clear_bit(Blocked
, &rdev
->flags
);
2730 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2731 wake_up(&rdev
->blocked_wait
);
2734 wake_up(&mddev
->sb_wait
);
2738 spin_lock(&mddev
->lock
);
2740 mddev
->utime
= ktime_get_real_seconds();
2742 if (test_and_clear_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
))
2744 if (test_and_clear_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
))
2745 /* just a clean<-> dirty transition, possibly leave spares alone,
2746 * though if events isn't the right even/odd, we will have to do
2752 if (mddev
->degraded
)
2753 /* If the array is degraded, then skipping spares is both
2754 * dangerous and fairly pointless.
2755 * Dangerous because a device that was removed from the array
2756 * might have a event_count that still looks up-to-date,
2757 * so it can be re-added without a resync.
2758 * Pointless because if there are any spares to skip,
2759 * then a recovery will happen and soon that array won't
2760 * be degraded any more and the spare can go back to sleep then.
2764 sync_req
= mddev
->in_sync
;
2766 /* If this is just a dirty<->clean transition, and the array is clean
2767 * and 'events' is odd, we can roll back to the previous clean state */
2769 && (mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
2770 && mddev
->can_decrease_events
2771 && mddev
->events
!= 1) {
2773 mddev
->can_decrease_events
= 0;
2775 /* otherwise we have to go forward and ... */
2777 mddev
->can_decrease_events
= nospares
;
2781 * This 64-bit counter should never wrap.
2782 * Either we are in around ~1 trillion A.C., assuming
2783 * 1 reboot per second, or we have a bug...
2785 WARN_ON(mddev
->events
== 0);
2787 rdev_for_each(rdev
, mddev
) {
2788 if (rdev
->badblocks
.changed
)
2789 any_badblocks_changed
++;
2790 if (test_bit(Faulty
, &rdev
->flags
))
2791 set_bit(FaultRecorded
, &rdev
->flags
);
2794 sync_sbs(mddev
, nospares
);
2795 spin_unlock(&mddev
->lock
);
2797 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2798 mdname(mddev
), mddev
->in_sync
);
2801 blk_add_trace_msg(mddev
->queue
, "md md_update_sb");
2803 md_bitmap_update_sb(mddev
->bitmap
);
2804 rdev_for_each(rdev
, mddev
) {
2805 if (rdev
->sb_loaded
!= 1)
2806 continue; /* no noise on spare devices */
2808 if (!test_bit(Faulty
, &rdev
->flags
)) {
2809 md_super_write(mddev
,rdev
,
2810 rdev
->sb_start
, rdev
->sb_size
,
2812 pr_debug("md: (write) %pg's sb offset: %llu\n",
2814 (unsigned long long)rdev
->sb_start
);
2815 rdev
->sb_events
= mddev
->events
;
2816 if (rdev
->badblocks
.size
) {
2817 md_super_write(mddev
, rdev
,
2818 rdev
->badblocks
.sector
,
2819 rdev
->badblocks
.size
<< 9,
2821 rdev
->badblocks
.size
= 0;
2825 pr_debug("md: %pg (skipping faulty)\n",
2828 if (mddev
->level
== LEVEL_MULTIPATH
)
2829 /* only need to write one superblock... */
2832 if (md_super_wait(mddev
) < 0)
2834 /* if there was a failure, MD_SB_CHANGE_DEVS was set, and we re-write super */
2836 if (mddev_is_clustered(mddev
) && ret
== 0)
2837 md_cluster_ops
->metadata_update_finish(mddev
);
2839 if (mddev
->in_sync
!= sync_req
||
2840 !bit_clear_unless(&mddev
->sb_flags
, BIT(MD_SB_CHANGE_PENDING
),
2841 BIT(MD_SB_CHANGE_DEVS
) | BIT(MD_SB_CHANGE_CLEAN
)))
2842 /* have to write it out again */
2844 wake_up(&mddev
->sb_wait
);
2845 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
2846 sysfs_notify_dirent_safe(mddev
->sysfs_completed
);
2848 rdev_for_each(rdev
, mddev
) {
2849 if (test_and_clear_bit(FaultRecorded
, &rdev
->flags
))
2850 clear_bit(Blocked
, &rdev
->flags
);
2852 if (any_badblocks_changed
)
2853 ack_all_badblocks(&rdev
->badblocks
);
2854 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2855 wake_up(&rdev
->blocked_wait
);
2858 EXPORT_SYMBOL(md_update_sb
);
2860 static int add_bound_rdev(struct md_rdev
*rdev
)
2862 struct mddev
*mddev
= rdev
->mddev
;
2864 bool add_journal
= test_bit(Journal
, &rdev
->flags
);
2866 if (!mddev
->pers
->hot_remove_disk
|| add_journal
) {
2867 /* If there is hot_add_disk but no hot_remove_disk
2868 * then added disks for geometry changes,
2869 * and should be added immediately.
2871 super_types
[mddev
->major_version
].
2872 validate_super(mddev
, rdev
);
2874 mddev_suspend(mddev
);
2875 err
= mddev
->pers
->hot_add_disk(mddev
, rdev
);
2877 mddev_resume(mddev
);
2879 md_kick_rdev_from_array(rdev
);
2883 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2885 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
2886 if (mddev
->degraded
)
2887 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
2888 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
2890 md_wakeup_thread(mddev
->thread
);
2894 /* words written to sysfs files may, or may not, be \n terminated.
2895 * We want to accept with case. For this we use cmd_match.
2897 static int cmd_match(const char *cmd
, const char *str
)
2899 /* See if cmd, written into a sysfs file, matches
2900 * str. They must either be the same, or cmd can
2901 * have a trailing newline
2903 while (*cmd
&& *str
&& *cmd
== *str
) {
2914 struct rdev_sysfs_entry
{
2915 struct attribute attr
;
2916 ssize_t (*show
)(struct md_rdev
*, char *);
2917 ssize_t (*store
)(struct md_rdev
*, const char *, size_t);
2921 state_show(struct md_rdev
*rdev
, char *page
)
2925 unsigned long flags
= READ_ONCE(rdev
->flags
);
2927 if (test_bit(Faulty
, &flags
) ||
2928 (!test_bit(ExternalBbl
, &flags
) &&
2929 rdev
->badblocks
.unacked_exist
))
2930 len
+= sprintf(page
+len
, "faulty%s", sep
);
2931 if (test_bit(In_sync
, &flags
))
2932 len
+= sprintf(page
+len
, "in_sync%s", sep
);
2933 if (test_bit(Journal
, &flags
))
2934 len
+= sprintf(page
+len
, "journal%s", sep
);
2935 if (test_bit(WriteMostly
, &flags
))
2936 len
+= sprintf(page
+len
, "write_mostly%s", sep
);
2937 if (test_bit(Blocked
, &flags
) ||
2938 (rdev
->badblocks
.unacked_exist
2939 && !test_bit(Faulty
, &flags
)))
2940 len
+= sprintf(page
+len
, "blocked%s", sep
);
2941 if (!test_bit(Faulty
, &flags
) &&
2942 !test_bit(Journal
, &flags
) &&
2943 !test_bit(In_sync
, &flags
))
2944 len
+= sprintf(page
+len
, "spare%s", sep
);
2945 if (test_bit(WriteErrorSeen
, &flags
))
2946 len
+= sprintf(page
+len
, "write_error%s", sep
);
2947 if (test_bit(WantReplacement
, &flags
))
2948 len
+= sprintf(page
+len
, "want_replacement%s", sep
);
2949 if (test_bit(Replacement
, &flags
))
2950 len
+= sprintf(page
+len
, "replacement%s", sep
);
2951 if (test_bit(ExternalBbl
, &flags
))
2952 len
+= sprintf(page
+len
, "external_bbl%s", sep
);
2953 if (test_bit(FailFast
, &flags
))
2954 len
+= sprintf(page
+len
, "failfast%s", sep
);
2959 return len
+sprintf(page
+len
, "\n");
2963 state_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2966 * faulty - simulates an error
2967 * remove - disconnects the device
2968 * writemostly - sets write_mostly
2969 * -writemostly - clears write_mostly
2970 * blocked - sets the Blocked flags
2971 * -blocked - clears the Blocked and possibly simulates an error
2972 * insync - sets Insync providing device isn't active
2973 * -insync - clear Insync for a device with a slot assigned,
2974 * so that it gets rebuilt based on bitmap
2975 * write_error - sets WriteErrorSeen
2976 * -write_error - clears WriteErrorSeen
2977 * {,-}failfast - set/clear FailFast
2980 struct mddev
*mddev
= rdev
->mddev
;
2982 bool need_update_sb
= false;
2984 if (cmd_match(buf
, "faulty") && rdev
->mddev
->pers
) {
2985 md_error(rdev
->mddev
, rdev
);
2987 if (test_bit(MD_BROKEN
, &rdev
->mddev
->flags
))
2991 } else if (cmd_match(buf
, "remove")) {
2992 if (rdev
->mddev
->pers
) {
2993 clear_bit(Blocked
, &rdev
->flags
);
2994 remove_and_add_spares(rdev
->mddev
, rdev
);
2996 if (rdev
->raid_disk
>= 0)
3000 if (mddev_is_clustered(mddev
))
3001 err
= md_cluster_ops
->remove_disk(mddev
, rdev
);
3004 md_kick_rdev_from_array(rdev
);
3006 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
3007 md_wakeup_thread(mddev
->thread
);
3012 } else if (cmd_match(buf
, "writemostly")) {
3013 set_bit(WriteMostly
, &rdev
->flags
);
3014 mddev_create_serial_pool(rdev
->mddev
, rdev
, false);
3015 need_update_sb
= true;
3017 } else if (cmd_match(buf
, "-writemostly")) {
3018 mddev_destroy_serial_pool(rdev
->mddev
, rdev
, false);
3019 clear_bit(WriteMostly
, &rdev
->flags
);
3020 need_update_sb
= true;
3022 } else if (cmd_match(buf
, "blocked")) {
3023 set_bit(Blocked
, &rdev
->flags
);
3025 } else if (cmd_match(buf
, "-blocked")) {
3026 if (!test_bit(Faulty
, &rdev
->flags
) &&
3027 !test_bit(ExternalBbl
, &rdev
->flags
) &&
3028 rdev
->badblocks
.unacked_exist
) {
3029 /* metadata handler doesn't understand badblocks,
3030 * so we need to fail the device
3032 md_error(rdev
->mddev
, rdev
);
3034 clear_bit(Blocked
, &rdev
->flags
);
3035 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
3036 wake_up(&rdev
->blocked_wait
);
3037 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
3038 md_wakeup_thread(rdev
->mddev
->thread
);
3041 } else if (cmd_match(buf
, "insync") && rdev
->raid_disk
== -1) {
3042 set_bit(In_sync
, &rdev
->flags
);
3044 } else if (cmd_match(buf
, "failfast")) {
3045 set_bit(FailFast
, &rdev
->flags
);
3046 need_update_sb
= true;
3048 } else if (cmd_match(buf
, "-failfast")) {
3049 clear_bit(FailFast
, &rdev
->flags
);
3050 need_update_sb
= true;
3052 } else if (cmd_match(buf
, "-insync") && rdev
->raid_disk
>= 0 &&
3053 !test_bit(Journal
, &rdev
->flags
)) {
3054 if (rdev
->mddev
->pers
== NULL
) {
3055 clear_bit(In_sync
, &rdev
->flags
);
3056 rdev
->saved_raid_disk
= rdev
->raid_disk
;
3057 rdev
->raid_disk
= -1;
3060 } else if (cmd_match(buf
, "write_error")) {
3061 set_bit(WriteErrorSeen
, &rdev
->flags
);
3063 } else if (cmd_match(buf
, "-write_error")) {
3064 clear_bit(WriteErrorSeen
, &rdev
->flags
);
3066 } else if (cmd_match(buf
, "want_replacement")) {
3067 /* Any non-spare device that is not a replacement can
3068 * become want_replacement at any time, but we then need to
3069 * check if recovery is needed.
3071 if (rdev
->raid_disk
>= 0 &&
3072 !test_bit(Journal
, &rdev
->flags
) &&
3073 !test_bit(Replacement
, &rdev
->flags
))
3074 set_bit(WantReplacement
, &rdev
->flags
);
3075 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
3076 md_wakeup_thread(rdev
->mddev
->thread
);
3078 } else if (cmd_match(buf
, "-want_replacement")) {
3079 /* Clearing 'want_replacement' is always allowed.
3080 * Once replacements starts it is too late though.
3083 clear_bit(WantReplacement
, &rdev
->flags
);
3084 } else if (cmd_match(buf
, "replacement")) {
3085 /* Can only set a device as a replacement when array has not
3086 * yet been started. Once running, replacement is automatic
3087 * from spares, or by assigning 'slot'.
3089 if (rdev
->mddev
->pers
)
3092 set_bit(Replacement
, &rdev
->flags
);
3095 } else if (cmd_match(buf
, "-replacement")) {
3096 /* Similarly, can only clear Replacement before start */
3097 if (rdev
->mddev
->pers
)
3100 clear_bit(Replacement
, &rdev
->flags
);
3103 } else if (cmd_match(buf
, "re-add")) {
3104 if (!rdev
->mddev
->pers
)
3106 else if (test_bit(Faulty
, &rdev
->flags
) && (rdev
->raid_disk
== -1) &&
3107 rdev
->saved_raid_disk
>= 0) {
3108 /* clear_bit is performed _after_ all the devices
3109 * have their local Faulty bit cleared. If any writes
3110 * happen in the meantime in the local node, they
3111 * will land in the local bitmap, which will be synced
3112 * by this node eventually
3114 if (!mddev_is_clustered(rdev
->mddev
) ||
3115 (err
= md_cluster_ops
->gather_bitmaps(rdev
)) == 0) {
3116 clear_bit(Faulty
, &rdev
->flags
);
3117 err
= add_bound_rdev(rdev
);
3121 } else if (cmd_match(buf
, "external_bbl") && (rdev
->mddev
->external
)) {
3122 set_bit(ExternalBbl
, &rdev
->flags
);
3123 rdev
->badblocks
.shift
= 0;
3125 } else if (cmd_match(buf
, "-external_bbl") && (rdev
->mddev
->external
)) {
3126 clear_bit(ExternalBbl
, &rdev
->flags
);
3130 md_update_sb(mddev
, 1);
3132 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
3133 return err
? err
: len
;
3135 static struct rdev_sysfs_entry rdev_state
=
3136 __ATTR_PREALLOC(state
, S_IRUGO
|S_IWUSR
, state_show
, state_store
);
3139 errors_show(struct md_rdev
*rdev
, char *page
)
3141 return sprintf(page
, "%d\n", atomic_read(&rdev
->corrected_errors
));
3145 errors_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3150 rv
= kstrtouint(buf
, 10, &n
);
3153 atomic_set(&rdev
->corrected_errors
, n
);
3156 static struct rdev_sysfs_entry rdev_errors
=
3157 __ATTR(errors
, S_IRUGO
|S_IWUSR
, errors_show
, errors_store
);
3160 slot_show(struct md_rdev
*rdev
, char *page
)
3162 if (test_bit(Journal
, &rdev
->flags
))
3163 return sprintf(page
, "journal\n");
3164 else if (rdev
->raid_disk
< 0)
3165 return sprintf(page
, "none\n");
3167 return sprintf(page
, "%d\n", rdev
->raid_disk
);
3171 slot_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3176 if (test_bit(Journal
, &rdev
->flags
))
3178 if (strncmp(buf
, "none", 4)==0)
3181 err
= kstrtouint(buf
, 10, (unsigned int *)&slot
);
3185 if (rdev
->mddev
->pers
&& slot
== -1) {
3186 /* Setting 'slot' on an active array requires also
3187 * updating the 'rd%d' link, and communicating
3188 * with the personality with ->hot_*_disk.
3189 * For now we only support removing
3190 * failed/spare devices. This normally happens automatically,
3191 * but not when the metadata is externally managed.
3193 if (rdev
->raid_disk
== -1)
3195 /* personality does all needed checks */
3196 if (rdev
->mddev
->pers
->hot_remove_disk
== NULL
)
3198 clear_bit(Blocked
, &rdev
->flags
);
3199 remove_and_add_spares(rdev
->mddev
, rdev
);
3200 if (rdev
->raid_disk
>= 0)
3202 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
3203 md_wakeup_thread(rdev
->mddev
->thread
);
3204 } else if (rdev
->mddev
->pers
) {
3205 /* Activating a spare .. or possibly reactivating
3206 * if we ever get bitmaps working here.
3210 if (rdev
->raid_disk
!= -1)
3213 if (test_bit(MD_RECOVERY_RUNNING
, &rdev
->mddev
->recovery
))
3216 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
3219 if (slot
>= rdev
->mddev
->raid_disks
&&
3220 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
3223 rdev
->raid_disk
= slot
;
3224 if (test_bit(In_sync
, &rdev
->flags
))
3225 rdev
->saved_raid_disk
= slot
;
3227 rdev
->saved_raid_disk
= -1;
3228 clear_bit(In_sync
, &rdev
->flags
);
3229 clear_bit(Bitmap_sync
, &rdev
->flags
);
3230 err
= rdev
->mddev
->pers
->hot_add_disk(rdev
->mddev
, rdev
);
3232 rdev
->raid_disk
= -1;
3235 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
3236 /* failure here is OK */;
3237 sysfs_link_rdev(rdev
->mddev
, rdev
);
3238 /* don't wakeup anyone, leave that to userspace. */
3240 if (slot
>= rdev
->mddev
->raid_disks
&&
3241 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
3243 rdev
->raid_disk
= slot
;
3244 /* assume it is working */
3245 clear_bit(Faulty
, &rdev
->flags
);
3246 clear_bit(WriteMostly
, &rdev
->flags
);
3247 set_bit(In_sync
, &rdev
->flags
);
3248 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
3253 static struct rdev_sysfs_entry rdev_slot
=
3254 __ATTR(slot
, S_IRUGO
|S_IWUSR
, slot_show
, slot_store
);
3257 offset_show(struct md_rdev
*rdev
, char *page
)
3259 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->data_offset
);
3263 offset_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3265 unsigned long long offset
;
3266 if (kstrtoull(buf
, 10, &offset
) < 0)
3268 if (rdev
->mddev
->pers
&& rdev
->raid_disk
>= 0)
3270 if (rdev
->sectors
&& rdev
->mddev
->external
)
3271 /* Must set offset before size, so overlap checks
3274 rdev
->data_offset
= offset
;
3275 rdev
->new_data_offset
= offset
;
3279 static struct rdev_sysfs_entry rdev_offset
=
3280 __ATTR(offset
, S_IRUGO
|S_IWUSR
, offset_show
, offset_store
);
3282 static ssize_t
new_offset_show(struct md_rdev
*rdev
, char *page
)
3284 return sprintf(page
, "%llu\n",
3285 (unsigned long long)rdev
->new_data_offset
);
3288 static ssize_t
new_offset_store(struct md_rdev
*rdev
,
3289 const char *buf
, size_t len
)
3291 unsigned long long new_offset
;
3292 struct mddev
*mddev
= rdev
->mddev
;
3294 if (kstrtoull(buf
, 10, &new_offset
) < 0)
3297 if (mddev
->sync_thread
||
3298 test_bit(MD_RECOVERY_RUNNING
,&mddev
->recovery
))
3300 if (new_offset
== rdev
->data_offset
)
3301 /* reset is always permitted */
3303 else if (new_offset
> rdev
->data_offset
) {
3304 /* must not push array size beyond rdev_sectors */
3305 if (new_offset
- rdev
->data_offset
3306 + mddev
->dev_sectors
> rdev
->sectors
)
3309 /* Metadata worries about other space details. */
3311 /* decreasing the offset is inconsistent with a backwards
3314 if (new_offset
< rdev
->data_offset
&&
3315 mddev
->reshape_backwards
)
3317 /* Increasing offset is inconsistent with forwards
3318 * reshape. reshape_direction should be set to
3319 * 'backwards' first.
3321 if (new_offset
> rdev
->data_offset
&&
3322 !mddev
->reshape_backwards
)
3325 if (mddev
->pers
&& mddev
->persistent
&&
3326 !super_types
[mddev
->major_version
]
3327 .allow_new_offset(rdev
, new_offset
))
3329 rdev
->new_data_offset
= new_offset
;
3330 if (new_offset
> rdev
->data_offset
)
3331 mddev
->reshape_backwards
= 1;
3332 else if (new_offset
< rdev
->data_offset
)
3333 mddev
->reshape_backwards
= 0;
3337 static struct rdev_sysfs_entry rdev_new_offset
=
3338 __ATTR(new_offset
, S_IRUGO
|S_IWUSR
, new_offset_show
, new_offset_store
);
3341 rdev_size_show(struct md_rdev
*rdev
, char *page
)
3343 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->sectors
/ 2);
3346 static int md_rdevs_overlap(struct md_rdev
*a
, struct md_rdev
*b
)
3348 /* check if two start/length pairs overlap */
3349 if (a
->data_offset
+ a
->sectors
<= b
->data_offset
)
3351 if (b
->data_offset
+ b
->sectors
<= a
->data_offset
)
3356 static bool md_rdev_overlaps(struct md_rdev
*rdev
)
3358 struct mddev
*mddev
;
3359 struct md_rdev
*rdev2
;
3361 spin_lock(&all_mddevs_lock
);
3362 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
) {
3363 rdev_for_each(rdev2
, mddev
) {
3364 if (rdev
!= rdev2
&& rdev
->bdev
== rdev2
->bdev
&&
3365 md_rdevs_overlap(rdev
, rdev2
)) {
3366 spin_unlock(&all_mddevs_lock
);
3371 spin_unlock(&all_mddevs_lock
);
3375 static int strict_blocks_to_sectors(const char *buf
, sector_t
*sectors
)
3377 unsigned long long blocks
;
3380 if (kstrtoull(buf
, 10, &blocks
) < 0)
3383 if (blocks
& 1ULL << (8 * sizeof(blocks
) - 1))
3384 return -EINVAL
; /* sector conversion overflow */
3387 if (new != blocks
* 2)
3388 return -EINVAL
; /* unsigned long long to sector_t overflow */
3395 rdev_size_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3397 struct mddev
*my_mddev
= rdev
->mddev
;
3398 sector_t oldsectors
= rdev
->sectors
;
3401 if (test_bit(Journal
, &rdev
->flags
))
3403 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
3405 if (rdev
->data_offset
!= rdev
->new_data_offset
)
3406 return -EINVAL
; /* too confusing */
3407 if (my_mddev
->pers
&& rdev
->raid_disk
>= 0) {
3408 if (my_mddev
->persistent
) {
3409 sectors
= super_types
[my_mddev
->major_version
].
3410 rdev_size_change(rdev
, sectors
);
3413 } else if (!sectors
)
3414 sectors
= bdev_nr_sectors(rdev
->bdev
) -
3416 if (!my_mddev
->pers
->resize
)
3417 /* Cannot change size for RAID0 or Linear etc */
3420 if (sectors
< my_mddev
->dev_sectors
)
3421 return -EINVAL
; /* component must fit device */
3423 rdev
->sectors
= sectors
;
3426 * Check that all other rdevs with the same bdev do not overlap. This
3427 * check does not provide a hard guarantee, it just helps avoid
3428 * dangerous mistakes.
3430 if (sectors
> oldsectors
&& my_mddev
->external
&&
3431 md_rdev_overlaps(rdev
)) {
3433 * Someone else could have slipped in a size change here, but
3434 * doing so is just silly. We put oldsectors back because we
3435 * know it is safe, and trust userspace not to race with itself.
3437 rdev
->sectors
= oldsectors
;
3443 static struct rdev_sysfs_entry rdev_size
=
3444 __ATTR(size
, S_IRUGO
|S_IWUSR
, rdev_size_show
, rdev_size_store
);
3446 static ssize_t
recovery_start_show(struct md_rdev
*rdev
, char *page
)
3448 unsigned long long recovery_start
= rdev
->recovery_offset
;
3450 if (test_bit(In_sync
, &rdev
->flags
) ||
3451 recovery_start
== MaxSector
)
3452 return sprintf(page
, "none\n");
3454 return sprintf(page
, "%llu\n", recovery_start
);
3457 static ssize_t
recovery_start_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3459 unsigned long long recovery_start
;
3461 if (cmd_match(buf
, "none"))
3462 recovery_start
= MaxSector
;
3463 else if (kstrtoull(buf
, 10, &recovery_start
))
3466 if (rdev
->mddev
->pers
&&
3467 rdev
->raid_disk
>= 0)
3470 rdev
->recovery_offset
= recovery_start
;
3471 if (recovery_start
== MaxSector
)
3472 set_bit(In_sync
, &rdev
->flags
);
3474 clear_bit(In_sync
, &rdev
->flags
);
3478 static struct rdev_sysfs_entry rdev_recovery_start
=
3479 __ATTR(recovery_start
, S_IRUGO
|S_IWUSR
, recovery_start_show
, recovery_start_store
);
3481 /* sysfs access to bad-blocks list.
3482 * We present two files.
3483 * 'bad-blocks' lists sector numbers and lengths of ranges that
3484 * are recorded as bad. The list is truncated to fit within
3485 * the one-page limit of sysfs.
3486 * Writing "sector length" to this file adds an acknowledged
3488 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
3489 * been acknowledged. Writing to this file adds bad blocks
3490 * without acknowledging them. This is largely for testing.
3492 static ssize_t
bb_show(struct md_rdev
*rdev
, char *page
)
3494 return badblocks_show(&rdev
->badblocks
, page
, 0);
3496 static ssize_t
bb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
3498 int rv
= badblocks_store(&rdev
->badblocks
, page
, len
, 0);
3499 /* Maybe that ack was all we needed */
3500 if (test_and_clear_bit(BlockedBadBlocks
, &rdev
->flags
))
3501 wake_up(&rdev
->blocked_wait
);
3504 static struct rdev_sysfs_entry rdev_bad_blocks
=
3505 __ATTR(bad_blocks
, S_IRUGO
|S_IWUSR
, bb_show
, bb_store
);
3507 static ssize_t
ubb_show(struct md_rdev
*rdev
, char *page
)
3509 return badblocks_show(&rdev
->badblocks
, page
, 1);
3511 static ssize_t
ubb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
3513 return badblocks_store(&rdev
->badblocks
, page
, len
, 1);
3515 static struct rdev_sysfs_entry rdev_unack_bad_blocks
=
3516 __ATTR(unacknowledged_bad_blocks
, S_IRUGO
|S_IWUSR
, ubb_show
, ubb_store
);
3519 ppl_sector_show(struct md_rdev
*rdev
, char *page
)
3521 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->ppl
.sector
);
3525 ppl_sector_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3527 unsigned long long sector
;
3529 if (kstrtoull(buf
, 10, §or
) < 0)
3531 if (sector
!= (sector_t
)sector
)
3534 if (rdev
->mddev
->pers
&& test_bit(MD_HAS_PPL
, &rdev
->mddev
->flags
) &&
3535 rdev
->raid_disk
>= 0)
3538 if (rdev
->mddev
->persistent
) {
3539 if (rdev
->mddev
->major_version
== 0)
3541 if ((sector
> rdev
->sb_start
&&
3542 sector
- rdev
->sb_start
> S16_MAX
) ||
3543 (sector
< rdev
->sb_start
&&
3544 rdev
->sb_start
- sector
> -S16_MIN
))
3546 rdev
->ppl
.offset
= sector
- rdev
->sb_start
;
3547 } else if (!rdev
->mddev
->external
) {
3550 rdev
->ppl
.sector
= sector
;
3554 static struct rdev_sysfs_entry rdev_ppl_sector
=
3555 __ATTR(ppl_sector
, S_IRUGO
|S_IWUSR
, ppl_sector_show
, ppl_sector_store
);
3558 ppl_size_show(struct md_rdev
*rdev
, char *page
)
3560 return sprintf(page
, "%u\n", rdev
->ppl
.size
);
3564 ppl_size_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3568 if (kstrtouint(buf
, 10, &size
) < 0)
3571 if (rdev
->mddev
->pers
&& test_bit(MD_HAS_PPL
, &rdev
->mddev
->flags
) &&
3572 rdev
->raid_disk
>= 0)
3575 if (rdev
->mddev
->persistent
) {
3576 if (rdev
->mddev
->major_version
== 0)
3580 } else if (!rdev
->mddev
->external
) {
3583 rdev
->ppl
.size
= size
;
3587 static struct rdev_sysfs_entry rdev_ppl_size
=
3588 __ATTR(ppl_size
, S_IRUGO
|S_IWUSR
, ppl_size_show
, ppl_size_store
);
3590 static struct attribute
*rdev_default_attrs
[] = {
3595 &rdev_new_offset
.attr
,
3597 &rdev_recovery_start
.attr
,
3598 &rdev_bad_blocks
.attr
,
3599 &rdev_unack_bad_blocks
.attr
,
3600 &rdev_ppl_sector
.attr
,
3601 &rdev_ppl_size
.attr
,
3604 ATTRIBUTE_GROUPS(rdev_default
);
3606 rdev_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
3608 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
3609 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
3615 return entry
->show(rdev
, page
);
3619 rdev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
3620 const char *page
, size_t length
)
3622 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
3623 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
3625 struct mddev
*mddev
= rdev
->mddev
;
3629 if (!capable(CAP_SYS_ADMIN
))
3631 rv
= mddev
? mddev_lock(mddev
) : -ENODEV
;
3633 if (rdev
->mddev
== NULL
)
3636 rv
= entry
->store(rdev
, page
, length
);
3637 mddev_unlock(mddev
);
3642 static void rdev_free(struct kobject
*ko
)
3644 struct md_rdev
*rdev
= container_of(ko
, struct md_rdev
, kobj
);
3647 static const struct sysfs_ops rdev_sysfs_ops
= {
3648 .show
= rdev_attr_show
,
3649 .store
= rdev_attr_store
,
3651 static struct kobj_type rdev_ktype
= {
3652 .release
= rdev_free
,
3653 .sysfs_ops
= &rdev_sysfs_ops
,
3654 .default_groups
= rdev_default_groups
,
3657 int md_rdev_init(struct md_rdev
*rdev
)
3660 rdev
->saved_raid_disk
= -1;
3661 rdev
->raid_disk
= -1;
3663 rdev
->data_offset
= 0;
3664 rdev
->new_data_offset
= 0;
3665 rdev
->sb_events
= 0;
3666 rdev
->last_read_error
= 0;
3667 rdev
->sb_loaded
= 0;
3668 rdev
->bb_page
= NULL
;
3669 atomic_set(&rdev
->nr_pending
, 0);
3670 atomic_set(&rdev
->read_errors
, 0);
3671 atomic_set(&rdev
->corrected_errors
, 0);
3673 INIT_LIST_HEAD(&rdev
->same_set
);
3674 init_waitqueue_head(&rdev
->blocked_wait
);
3676 /* Add space to store bad block list.
3677 * This reserves the space even on arrays where it cannot
3678 * be used - I wonder if that matters
3680 return badblocks_init(&rdev
->badblocks
, 0);
3682 EXPORT_SYMBOL_GPL(md_rdev_init
);
3684 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3686 * mark the device faulty if:
3688 * - the device is nonexistent (zero size)
3689 * - the device has no valid superblock
3691 * a faulty rdev _never_ has rdev->sb set.
3693 static struct md_rdev
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
3696 struct md_rdev
*rdev
;
3699 rdev
= kzalloc(sizeof(*rdev
), GFP_KERNEL
);
3701 return ERR_PTR(-ENOMEM
);
3703 err
= md_rdev_init(rdev
);
3706 err
= alloc_disk_sb(rdev
);
3710 err
= lock_rdev(rdev
, newdev
, super_format
== -2);
3714 kobject_init(&rdev
->kobj
, &rdev_ktype
);
3716 size
= bdev_nr_bytes(rdev
->bdev
) >> BLOCK_SIZE_BITS
;
3718 pr_warn("md: %pg has zero or unknown size, marking faulty!\n",
3724 if (super_format
>= 0) {
3725 err
= super_types
[super_format
].
3726 load_super(rdev
, NULL
, super_minor
);
3727 if (err
== -EINVAL
) {
3728 pr_warn("md: %pg does not have a valid v%d.%d superblock, not importing!\n",
3730 super_format
, super_minor
);
3734 pr_warn("md: could not read %pg's sb, not importing!\n",
3745 md_rdev_clear(rdev
);
3747 return ERR_PTR(err
);
3751 * Check a full RAID array for plausibility
3754 static int analyze_sbs(struct mddev
*mddev
)
3757 struct md_rdev
*rdev
, *freshest
, *tmp
;
3760 rdev_for_each_safe(rdev
, tmp
, mddev
)
3761 switch (super_types
[mddev
->major_version
].
3762 load_super(rdev
, freshest
, mddev
->minor_version
)) {
3769 pr_warn("md: fatal superblock inconsistency in %pg -- removing from array\n",
3771 md_kick_rdev_from_array(rdev
);
3774 /* Cannot find a valid fresh disk */
3776 pr_warn("md: cannot find a valid disk\n");
3780 super_types
[mddev
->major_version
].
3781 validate_super(mddev
, freshest
);
3784 rdev_for_each_safe(rdev
, tmp
, mddev
) {
3785 if (mddev
->max_disks
&&
3786 (rdev
->desc_nr
>= mddev
->max_disks
||
3787 i
> mddev
->max_disks
)) {
3788 pr_warn("md: %s: %pg: only %d devices permitted\n",
3789 mdname(mddev
), rdev
->bdev
,
3791 md_kick_rdev_from_array(rdev
);
3794 if (rdev
!= freshest
) {
3795 if (super_types
[mddev
->major_version
].
3796 validate_super(mddev
, rdev
)) {
3797 pr_warn("md: kicking non-fresh %pg from array!\n",
3799 md_kick_rdev_from_array(rdev
);
3803 if (mddev
->level
== LEVEL_MULTIPATH
) {
3804 rdev
->desc_nr
= i
++;
3805 rdev
->raid_disk
= rdev
->desc_nr
;
3806 set_bit(In_sync
, &rdev
->flags
);
3807 } else if (rdev
->raid_disk
>=
3808 (mddev
->raid_disks
- min(0, mddev
->delta_disks
)) &&
3809 !test_bit(Journal
, &rdev
->flags
)) {
3810 rdev
->raid_disk
= -1;
3811 clear_bit(In_sync
, &rdev
->flags
);
3818 /* Read a fixed-point number.
3819 * Numbers in sysfs attributes should be in "standard" units where
3820 * possible, so time should be in seconds.
3821 * However we internally use a a much smaller unit such as
3822 * milliseconds or jiffies.
3823 * This function takes a decimal number with a possible fractional
3824 * component, and produces an integer which is the result of
3825 * multiplying that number by 10^'scale'.
3826 * all without any floating-point arithmetic.
3828 int strict_strtoul_scaled(const char *cp
, unsigned long *res
, int scale
)
3830 unsigned long result
= 0;
3832 while (isdigit(*cp
) || (*cp
== '.' && decimals
< 0)) {
3835 else if (decimals
< scale
) {
3838 result
= result
* 10 + value
;
3850 *res
= result
* int_pow(10, scale
- decimals
);
3855 safe_delay_show(struct mddev
*mddev
, char *page
)
3857 int msec
= (mddev
->safemode_delay
*1000)/HZ
;
3858 return sprintf(page
, "%d.%03d\n", msec
/1000, msec
%1000);
3861 safe_delay_store(struct mddev
*mddev
, const char *cbuf
, size_t len
)
3865 if (mddev_is_clustered(mddev
)) {
3866 pr_warn("md: Safemode is disabled for clustered mode\n");
3870 if (strict_strtoul_scaled(cbuf
, &msec
, 3) < 0)
3873 mddev
->safemode_delay
= 0;
3875 unsigned long old_delay
= mddev
->safemode_delay
;
3876 unsigned long new_delay
= (msec
*HZ
)/1000;
3880 mddev
->safemode_delay
= new_delay
;
3881 if (new_delay
< old_delay
|| old_delay
== 0)
3882 mod_timer(&mddev
->safemode_timer
, jiffies
+1);
3886 static struct md_sysfs_entry md_safe_delay
=
3887 __ATTR(safe_mode_delay
, S_IRUGO
|S_IWUSR
,safe_delay_show
, safe_delay_store
);
3890 level_show(struct mddev
*mddev
, char *page
)
3892 struct md_personality
*p
;
3894 spin_lock(&mddev
->lock
);
3897 ret
= sprintf(page
, "%s\n", p
->name
);
3898 else if (mddev
->clevel
[0])
3899 ret
= sprintf(page
, "%s\n", mddev
->clevel
);
3900 else if (mddev
->level
!= LEVEL_NONE
)
3901 ret
= sprintf(page
, "%d\n", mddev
->level
);
3904 spin_unlock(&mddev
->lock
);
3909 level_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3914 struct md_personality
*pers
, *oldpers
;
3916 void *priv
, *oldpriv
;
3917 struct md_rdev
*rdev
;
3919 if (slen
== 0 || slen
>= sizeof(clevel
))
3922 rv
= mddev_lock(mddev
);
3926 if (mddev
->pers
== NULL
) {
3927 strncpy(mddev
->clevel
, buf
, slen
);
3928 if (mddev
->clevel
[slen
-1] == '\n')
3930 mddev
->clevel
[slen
] = 0;
3931 mddev
->level
= LEVEL_NONE
;
3939 /* request to change the personality. Need to ensure:
3940 * - array is not engaged in resync/recovery/reshape
3941 * - old personality can be suspended
3942 * - new personality will access other array.
3946 if (mddev
->sync_thread
||
3947 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
3948 mddev
->reshape_position
!= MaxSector
||
3949 mddev
->sysfs_active
)
3953 if (!mddev
->pers
->quiesce
) {
3954 pr_warn("md: %s: %s does not support online personality change\n",
3955 mdname(mddev
), mddev
->pers
->name
);
3959 /* Now find the new personality */
3960 strncpy(clevel
, buf
, slen
);
3961 if (clevel
[slen
-1] == '\n')
3964 if (kstrtol(clevel
, 10, &level
))
3967 if (request_module("md-%s", clevel
) != 0)
3968 request_module("md-level-%s", clevel
);
3969 spin_lock(&pers_lock
);
3970 pers
= find_pers(level
, clevel
);
3971 if (!pers
|| !try_module_get(pers
->owner
)) {
3972 spin_unlock(&pers_lock
);
3973 pr_warn("md: personality %s not loaded\n", clevel
);
3977 spin_unlock(&pers_lock
);
3979 if (pers
== mddev
->pers
) {
3980 /* Nothing to do! */
3981 module_put(pers
->owner
);
3985 if (!pers
->takeover
) {
3986 module_put(pers
->owner
);
3987 pr_warn("md: %s: %s does not support personality takeover\n",
3988 mdname(mddev
), clevel
);
3993 rdev_for_each(rdev
, mddev
)
3994 rdev
->new_raid_disk
= rdev
->raid_disk
;
3996 /* ->takeover must set new_* and/or delta_disks
3997 * if it succeeds, and may set them when it fails.
3999 priv
= pers
->takeover(mddev
);
4001 mddev
->new_level
= mddev
->level
;
4002 mddev
->new_layout
= mddev
->layout
;
4003 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
4004 mddev
->raid_disks
-= mddev
->delta_disks
;
4005 mddev
->delta_disks
= 0;
4006 mddev
->reshape_backwards
= 0;
4007 module_put(pers
->owner
);
4008 pr_warn("md: %s: %s would not accept array\n",
4009 mdname(mddev
), clevel
);
4014 /* Looks like we have a winner */
4015 mddev_suspend(mddev
);
4016 mddev_detach(mddev
);
4018 spin_lock(&mddev
->lock
);
4019 oldpers
= mddev
->pers
;
4020 oldpriv
= mddev
->private;
4022 mddev
->private = priv
;
4023 strscpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
4024 mddev
->level
= mddev
->new_level
;
4025 mddev
->layout
= mddev
->new_layout
;
4026 mddev
->chunk_sectors
= mddev
->new_chunk_sectors
;
4027 mddev
->delta_disks
= 0;
4028 mddev
->reshape_backwards
= 0;
4029 mddev
->degraded
= 0;
4030 spin_unlock(&mddev
->lock
);
4032 if (oldpers
->sync_request
== NULL
&&
4034 /* We are converting from a no-redundancy array
4035 * to a redundancy array and metadata is managed
4036 * externally so we need to be sure that writes
4037 * won't block due to a need to transition
4039 * until external management is started.
4042 mddev
->safemode_delay
= 0;
4043 mddev
->safemode
= 0;
4046 oldpers
->free(mddev
, oldpriv
);
4048 if (oldpers
->sync_request
== NULL
&&
4049 pers
->sync_request
!= NULL
) {
4050 /* need to add the md_redundancy_group */
4051 if (sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
4052 pr_warn("md: cannot register extra attributes for %s\n",
4054 mddev
->sysfs_action
= sysfs_get_dirent(mddev
->kobj
.sd
, "sync_action");
4055 mddev
->sysfs_completed
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "sync_completed");
4056 mddev
->sysfs_degraded
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "degraded");
4058 if (oldpers
->sync_request
!= NULL
&&
4059 pers
->sync_request
== NULL
) {
4060 /* need to remove the md_redundancy_group */
4061 if (mddev
->to_remove
== NULL
)
4062 mddev
->to_remove
= &md_redundancy_group
;
4065 module_put(oldpers
->owner
);
4067 rdev_for_each(rdev
, mddev
) {
4068 if (rdev
->raid_disk
< 0)
4070 if (rdev
->new_raid_disk
>= mddev
->raid_disks
)
4071 rdev
->new_raid_disk
= -1;
4072 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
4074 sysfs_unlink_rdev(mddev
, rdev
);
4076 rdev_for_each(rdev
, mddev
) {
4077 if (rdev
->raid_disk
< 0)
4079 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
4081 rdev
->raid_disk
= rdev
->new_raid_disk
;
4082 if (rdev
->raid_disk
< 0)
4083 clear_bit(In_sync
, &rdev
->flags
);
4085 if (sysfs_link_rdev(mddev
, rdev
))
4086 pr_warn("md: cannot register rd%d for %s after level change\n",
4087 rdev
->raid_disk
, mdname(mddev
));
4091 if (pers
->sync_request
== NULL
) {
4092 /* this is now an array without redundancy, so
4093 * it must always be in_sync
4096 del_timer_sync(&mddev
->safemode_timer
);
4098 blk_set_stacking_limits(&mddev
->queue
->limits
);
4100 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
4101 mddev_resume(mddev
);
4103 md_update_sb(mddev
, 1);
4104 sysfs_notify_dirent_safe(mddev
->sysfs_level
);
4108 mddev_unlock(mddev
);
4112 static struct md_sysfs_entry md_level
=
4113 __ATTR(level
, S_IRUGO
|S_IWUSR
, level_show
, level_store
);
4116 layout_show(struct mddev
*mddev
, char *page
)
4118 /* just a number, not meaningful for all levels */
4119 if (mddev
->reshape_position
!= MaxSector
&&
4120 mddev
->layout
!= mddev
->new_layout
)
4121 return sprintf(page
, "%d (%d)\n",
4122 mddev
->new_layout
, mddev
->layout
);
4123 return sprintf(page
, "%d\n", mddev
->layout
);
4127 layout_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4132 err
= kstrtouint(buf
, 10, &n
);
4135 err
= mddev_lock(mddev
);
4140 if (mddev
->pers
->check_reshape
== NULL
)
4145 mddev
->new_layout
= n
;
4146 err
= mddev
->pers
->check_reshape(mddev
);
4148 mddev
->new_layout
= mddev
->layout
;
4151 mddev
->new_layout
= n
;
4152 if (mddev
->reshape_position
== MaxSector
)
4155 mddev_unlock(mddev
);
4158 static struct md_sysfs_entry md_layout
=
4159 __ATTR(layout
, S_IRUGO
|S_IWUSR
, layout_show
, layout_store
);
4162 raid_disks_show(struct mddev
*mddev
, char *page
)
4164 if (mddev
->raid_disks
== 0)
4166 if (mddev
->reshape_position
!= MaxSector
&&
4167 mddev
->delta_disks
!= 0)
4168 return sprintf(page
, "%d (%d)\n", mddev
->raid_disks
,
4169 mddev
->raid_disks
- mddev
->delta_disks
);
4170 return sprintf(page
, "%d\n", mddev
->raid_disks
);
4173 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
);
4176 raid_disks_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4181 err
= kstrtouint(buf
, 10, &n
);
4185 err
= mddev_lock(mddev
);
4189 err
= update_raid_disks(mddev
, n
);
4190 else if (mddev
->reshape_position
!= MaxSector
) {
4191 struct md_rdev
*rdev
;
4192 int olddisks
= mddev
->raid_disks
- mddev
->delta_disks
;
4195 rdev_for_each(rdev
, mddev
) {
4197 rdev
->data_offset
< rdev
->new_data_offset
)
4200 rdev
->data_offset
> rdev
->new_data_offset
)
4204 mddev
->delta_disks
= n
- olddisks
;
4205 mddev
->raid_disks
= n
;
4206 mddev
->reshape_backwards
= (mddev
->delta_disks
< 0);
4208 mddev
->raid_disks
= n
;
4210 mddev_unlock(mddev
);
4211 return err
? err
: len
;
4213 static struct md_sysfs_entry md_raid_disks
=
4214 __ATTR(raid_disks
, S_IRUGO
|S_IWUSR
, raid_disks_show
, raid_disks_store
);
4217 uuid_show(struct mddev
*mddev
, char *page
)
4219 return sprintf(page
, "%pU\n", mddev
->uuid
);
4221 static struct md_sysfs_entry md_uuid
=
4222 __ATTR(uuid
, S_IRUGO
, uuid_show
, NULL
);
4225 chunk_size_show(struct mddev
*mddev
, char *page
)
4227 if (mddev
->reshape_position
!= MaxSector
&&
4228 mddev
->chunk_sectors
!= mddev
->new_chunk_sectors
)
4229 return sprintf(page
, "%d (%d)\n",
4230 mddev
->new_chunk_sectors
<< 9,
4231 mddev
->chunk_sectors
<< 9);
4232 return sprintf(page
, "%d\n", mddev
->chunk_sectors
<< 9);
4236 chunk_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4241 err
= kstrtoul(buf
, 10, &n
);
4245 err
= mddev_lock(mddev
);
4249 if (mddev
->pers
->check_reshape
== NULL
)
4254 mddev
->new_chunk_sectors
= n
>> 9;
4255 err
= mddev
->pers
->check_reshape(mddev
);
4257 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
4260 mddev
->new_chunk_sectors
= n
>> 9;
4261 if (mddev
->reshape_position
== MaxSector
)
4262 mddev
->chunk_sectors
= n
>> 9;
4264 mddev_unlock(mddev
);
4267 static struct md_sysfs_entry md_chunk_size
=
4268 __ATTR(chunk_size
, S_IRUGO
|S_IWUSR
, chunk_size_show
, chunk_size_store
);
4271 resync_start_show(struct mddev
*mddev
, char *page
)
4273 if (mddev
->recovery_cp
== MaxSector
)
4274 return sprintf(page
, "none\n");
4275 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->recovery_cp
);
4279 resync_start_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4281 unsigned long long n
;
4284 if (cmd_match(buf
, "none"))
4287 err
= kstrtoull(buf
, 10, &n
);
4290 if (n
!= (sector_t
)n
)
4294 err
= mddev_lock(mddev
);
4297 if (mddev
->pers
&& !test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
4301 mddev
->recovery_cp
= n
;
4303 set_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
4305 mddev_unlock(mddev
);
4308 static struct md_sysfs_entry md_resync_start
=
4309 __ATTR_PREALLOC(resync_start
, S_IRUGO
|S_IWUSR
,
4310 resync_start_show
, resync_start_store
);
4313 * The array state can be:
4316 * No devices, no size, no level
4317 * Equivalent to STOP_ARRAY ioctl
4319 * May have some settings, but array is not active
4320 * all IO results in error
4321 * When written, doesn't tear down array, but just stops it
4322 * suspended (not supported yet)
4323 * All IO requests will block. The array can be reconfigured.
4324 * Writing this, if accepted, will block until array is quiescent
4326 * no resync can happen. no superblocks get written.
4327 * write requests fail
4329 * like readonly, but behaves like 'clean' on a write request.
4331 * clean - no pending writes, but otherwise active.
4332 * When written to inactive array, starts without resync
4333 * If a write request arrives then
4334 * if metadata is known, mark 'dirty' and switch to 'active'.
4335 * if not known, block and switch to write-pending
4336 * If written to an active array that has pending writes, then fails.
4338 * fully active: IO and resync can be happening.
4339 * When written to inactive array, starts with resync
4342 * clean, but writes are blocked waiting for 'active' to be written.
4345 * like active, but no writes have been seen for a while (100msec).
4348 * Array is failed. It's useful because mounted-arrays aren't stopped
4349 * when array is failed, so this state will at least alert the user that
4350 * something is wrong.
4352 enum array_state
{ clear
, inactive
, suspended
, readonly
, read_auto
, clean
, active
,
4353 write_pending
, active_idle
, broken
, bad_word
};
4354 static char *array_states
[] = {
4355 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
4356 "write-pending", "active-idle", "broken", NULL
};
4358 static int match_word(const char *word
, char **list
)
4361 for (n
=0; list
[n
]; n
++)
4362 if (cmd_match(word
, list
[n
]))
4368 array_state_show(struct mddev
*mddev
, char *page
)
4370 enum array_state st
= inactive
;
4372 if (mddev
->pers
&& !test_bit(MD_NOT_READY
, &mddev
->flags
)) {
4381 spin_lock(&mddev
->lock
);
4382 if (test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
))
4384 else if (mddev
->in_sync
)
4386 else if (mddev
->safemode
)
4390 spin_unlock(&mddev
->lock
);
4393 if (test_bit(MD_BROKEN
, &mddev
->flags
) && st
== clean
)
4396 if (list_empty(&mddev
->disks
) &&
4397 mddev
->raid_disks
== 0 &&
4398 mddev
->dev_sectors
== 0)
4403 return sprintf(page
, "%s\n", array_states
[st
]);
4406 static int do_md_stop(struct mddev
*mddev
, int ro
, struct block_device
*bdev
);
4407 static int md_set_readonly(struct mddev
*mddev
, struct block_device
*bdev
);
4408 static int restart_array(struct mddev
*mddev
);
4411 array_state_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4414 enum array_state st
= match_word(buf
, array_states
);
4416 if (mddev
->pers
&& (st
== active
|| st
== clean
) && mddev
->ro
!= 1) {
4417 /* don't take reconfig_mutex when toggling between
4420 spin_lock(&mddev
->lock
);
4422 restart_array(mddev
);
4423 clear_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
4424 md_wakeup_thread(mddev
->thread
);
4425 wake_up(&mddev
->sb_wait
);
4426 } else /* st == clean */ {
4427 restart_array(mddev
);
4428 if (!set_in_sync(mddev
))
4432 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4433 spin_unlock(&mddev
->lock
);
4436 err
= mddev_lock(mddev
);
4444 /* stopping an active array */
4445 err
= do_md_stop(mddev
, 0, NULL
);
4448 /* stopping an active array */
4450 err
= do_md_stop(mddev
, 2, NULL
);
4452 err
= 0; /* already inactive */
4455 break; /* not supported yet */
4458 err
= md_set_readonly(mddev
, NULL
);
4461 set_disk_ro(mddev
->gendisk
, 1);
4462 err
= do_md_run(mddev
);
4468 err
= md_set_readonly(mddev
, NULL
);
4469 else if (mddev
->ro
== 1)
4470 err
= restart_array(mddev
);
4473 set_disk_ro(mddev
->gendisk
, 0);
4477 err
= do_md_run(mddev
);
4482 err
= restart_array(mddev
);
4485 spin_lock(&mddev
->lock
);
4486 if (!set_in_sync(mddev
))
4488 spin_unlock(&mddev
->lock
);
4494 err
= restart_array(mddev
);
4497 clear_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
4498 wake_up(&mddev
->sb_wait
);
4502 set_disk_ro(mddev
->gendisk
, 0);
4503 err
= do_md_run(mddev
);
4509 /* these cannot be set */
4514 if (mddev
->hold_active
== UNTIL_IOCTL
)
4515 mddev
->hold_active
= 0;
4516 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4518 mddev_unlock(mddev
);
4521 static struct md_sysfs_entry md_array_state
=
4522 __ATTR_PREALLOC(array_state
, S_IRUGO
|S_IWUSR
, array_state_show
, array_state_store
);
4525 max_corrected_read_errors_show(struct mddev
*mddev
, char *page
) {
4526 return sprintf(page
, "%d\n",
4527 atomic_read(&mddev
->max_corr_read_errors
));
4531 max_corrected_read_errors_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4536 rv
= kstrtouint(buf
, 10, &n
);
4539 atomic_set(&mddev
->max_corr_read_errors
, n
);
4543 static struct md_sysfs_entry max_corr_read_errors
=
4544 __ATTR(max_read_errors
, S_IRUGO
|S_IWUSR
, max_corrected_read_errors_show
,
4545 max_corrected_read_errors_store
);
4548 null_show(struct mddev
*mddev
, char *page
)
4553 /* need to ensure rdev_delayed_delete() has completed */
4554 static void flush_rdev_wq(struct mddev
*mddev
)
4556 struct md_rdev
*rdev
;
4559 rdev_for_each_rcu(rdev
, mddev
)
4560 if (work_pending(&rdev
->del_work
)) {
4561 flush_workqueue(md_rdev_misc_wq
);
4568 new_dev_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4570 /* buf must be %d:%d\n? giving major and minor numbers */
4571 /* The new device is added to the array.
4572 * If the array has a persistent superblock, we read the
4573 * superblock to initialise info and check validity.
4574 * Otherwise, only checking done is that in bind_rdev_to_array,
4575 * which mainly checks size.
4578 int major
= simple_strtoul(buf
, &e
, 10);
4581 struct md_rdev
*rdev
;
4584 if (!*buf
|| *e
!= ':' || !e
[1] || e
[1] == '\n')
4586 minor
= simple_strtoul(e
+1, &e
, 10);
4587 if (*e
&& *e
!= '\n')
4589 dev
= MKDEV(major
, minor
);
4590 if (major
!= MAJOR(dev
) ||
4591 minor
!= MINOR(dev
))
4594 flush_rdev_wq(mddev
);
4595 err
= mddev_lock(mddev
);
4598 if (mddev
->persistent
) {
4599 rdev
= md_import_device(dev
, mddev
->major_version
,
4600 mddev
->minor_version
);
4601 if (!IS_ERR(rdev
) && !list_empty(&mddev
->disks
)) {
4602 struct md_rdev
*rdev0
4603 = list_entry(mddev
->disks
.next
,
4604 struct md_rdev
, same_set
);
4605 err
= super_types
[mddev
->major_version
]
4606 .load_super(rdev
, rdev0
, mddev
->minor_version
);
4610 } else if (mddev
->external
)
4611 rdev
= md_import_device(dev
, -2, -1);
4613 rdev
= md_import_device(dev
, -1, -1);
4616 mddev_unlock(mddev
);
4617 return PTR_ERR(rdev
);
4619 err
= bind_rdev_to_array(rdev
, mddev
);
4623 mddev_unlock(mddev
);
4626 return err
? err
: len
;
4629 static struct md_sysfs_entry md_new_device
=
4630 __ATTR(new_dev
, S_IWUSR
, null_show
, new_dev_store
);
4633 bitmap_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4636 unsigned long chunk
, end_chunk
;
4639 err
= mddev_lock(mddev
);
4644 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
4646 chunk
= end_chunk
= simple_strtoul(buf
, &end
, 0);
4647 if (buf
== end
) break;
4648 if (*end
== '-') { /* range */
4650 end_chunk
= simple_strtoul(buf
, &end
, 0);
4651 if (buf
== end
) break;
4653 if (*end
&& !isspace(*end
)) break;
4654 md_bitmap_dirty_bits(mddev
->bitmap
, chunk
, end_chunk
);
4655 buf
= skip_spaces(end
);
4657 md_bitmap_unplug(mddev
->bitmap
); /* flush the bits to disk */
4659 mddev_unlock(mddev
);
4663 static struct md_sysfs_entry md_bitmap
=
4664 __ATTR(bitmap_set_bits
, S_IWUSR
, null_show
, bitmap_store
);
4667 size_show(struct mddev
*mddev
, char *page
)
4669 return sprintf(page
, "%llu\n",
4670 (unsigned long long)mddev
->dev_sectors
/ 2);
4673 static int update_size(struct mddev
*mddev
, sector_t num_sectors
);
4676 size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4678 /* If array is inactive, we can reduce the component size, but
4679 * not increase it (except from 0).
4680 * If array is active, we can try an on-line resize
4683 int err
= strict_blocks_to_sectors(buf
, §ors
);
4687 err
= mddev_lock(mddev
);
4691 err
= update_size(mddev
, sectors
);
4693 md_update_sb(mddev
, 1);
4695 if (mddev
->dev_sectors
== 0 ||
4696 mddev
->dev_sectors
> sectors
)
4697 mddev
->dev_sectors
= sectors
;
4701 mddev_unlock(mddev
);
4702 return err
? err
: len
;
4705 static struct md_sysfs_entry md_size
=
4706 __ATTR(component_size
, S_IRUGO
|S_IWUSR
, size_show
, size_store
);
4708 /* Metadata version.
4710 * 'none' for arrays with no metadata (good luck...)
4711 * 'external' for arrays with externally managed metadata,
4712 * or N.M for internally known formats
4715 metadata_show(struct mddev
*mddev
, char *page
)
4717 if (mddev
->persistent
)
4718 return sprintf(page
, "%d.%d\n",
4719 mddev
->major_version
, mddev
->minor_version
);
4720 else if (mddev
->external
)
4721 return sprintf(page
, "external:%s\n", mddev
->metadata_type
);
4723 return sprintf(page
, "none\n");
4727 metadata_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4732 /* Changing the details of 'external' metadata is
4733 * always permitted. Otherwise there must be
4734 * no devices attached to the array.
4737 err
= mddev_lock(mddev
);
4741 if (mddev
->external
&& strncmp(buf
, "external:", 9) == 0)
4743 else if (!list_empty(&mddev
->disks
))
4747 if (cmd_match(buf
, "none")) {
4748 mddev
->persistent
= 0;
4749 mddev
->external
= 0;
4750 mddev
->major_version
= 0;
4751 mddev
->minor_version
= 90;
4754 if (strncmp(buf
, "external:", 9) == 0) {
4755 size_t namelen
= len
-9;
4756 if (namelen
>= sizeof(mddev
->metadata_type
))
4757 namelen
= sizeof(mddev
->metadata_type
)-1;
4758 strncpy(mddev
->metadata_type
, buf
+9, namelen
);
4759 mddev
->metadata_type
[namelen
] = 0;
4760 if (namelen
&& mddev
->metadata_type
[namelen
-1] == '\n')
4761 mddev
->metadata_type
[--namelen
] = 0;
4762 mddev
->persistent
= 0;
4763 mddev
->external
= 1;
4764 mddev
->major_version
= 0;
4765 mddev
->minor_version
= 90;
4768 major
= simple_strtoul(buf
, &e
, 10);
4770 if (e
==buf
|| *e
!= '.')
4773 minor
= simple_strtoul(buf
, &e
, 10);
4774 if (e
==buf
|| (*e
&& *e
!= '\n') )
4777 if (major
>= ARRAY_SIZE(super_types
) || super_types
[major
].name
== NULL
)
4779 mddev
->major_version
= major
;
4780 mddev
->minor_version
= minor
;
4781 mddev
->persistent
= 1;
4782 mddev
->external
= 0;
4785 mddev_unlock(mddev
);
4789 static struct md_sysfs_entry md_metadata
=
4790 __ATTR_PREALLOC(metadata_version
, S_IRUGO
|S_IWUSR
, metadata_show
, metadata_store
);
4793 action_show(struct mddev
*mddev
, char *page
)
4795 char *type
= "idle";
4796 unsigned long recovery
= mddev
->recovery
;
4797 if (test_bit(MD_RECOVERY_FROZEN
, &recovery
))
4799 else if (test_bit(MD_RECOVERY_RUNNING
, &recovery
) ||
4800 (!mddev
->ro
&& test_bit(MD_RECOVERY_NEEDED
, &recovery
))) {
4801 if (test_bit(MD_RECOVERY_RESHAPE
, &recovery
))
4803 else if (test_bit(MD_RECOVERY_SYNC
, &recovery
)) {
4804 if (!test_bit(MD_RECOVERY_REQUESTED
, &recovery
))
4806 else if (test_bit(MD_RECOVERY_CHECK
, &recovery
))
4810 } else if (test_bit(MD_RECOVERY_RECOVER
, &recovery
))
4812 else if (mddev
->reshape_position
!= MaxSector
)
4815 return sprintf(page
, "%s\n", type
);
4819 action_store(struct mddev
*mddev
, const char *page
, size_t len
)
4821 if (!mddev
->pers
|| !mddev
->pers
->sync_request
)
4825 if (cmd_match(page
, "idle") || cmd_match(page
, "frozen")) {
4826 if (cmd_match(page
, "frozen"))
4827 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4829 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4830 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
4831 mddev_lock(mddev
) == 0) {
4832 if (work_pending(&mddev
->del_work
))
4833 flush_workqueue(md_misc_wq
);
4834 if (mddev
->sync_thread
) {
4835 sector_t save_rp
= mddev
->reshape_position
;
4837 mddev_unlock(mddev
);
4838 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4839 md_unregister_thread(&mddev
->sync_thread
);
4840 mddev_lock_nointr(mddev
);
4842 * set RECOVERY_INTR again and restore reshape
4843 * position in case others changed them after
4844 * got lock, eg, reshape_position_store and
4845 * md_check_recovery.
4847 mddev
->reshape_position
= save_rp
;
4848 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4849 md_reap_sync_thread(mddev
);
4851 mddev_unlock(mddev
);
4853 } else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4855 else if (cmd_match(page
, "resync"))
4856 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4857 else if (cmd_match(page
, "recover")) {
4858 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4859 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
4860 } else if (cmd_match(page
, "reshape")) {
4862 if (mddev
->pers
->start_reshape
== NULL
)
4864 err
= mddev_lock(mddev
);
4866 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4869 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4870 err
= mddev
->pers
->start_reshape(mddev
);
4872 mddev_unlock(mddev
);
4876 sysfs_notify_dirent_safe(mddev
->sysfs_degraded
);
4878 if (cmd_match(page
, "check"))
4879 set_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
4880 else if (!cmd_match(page
, "repair"))
4882 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4883 set_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
4884 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
4886 if (mddev
->ro
== 2) {
4887 /* A write to sync_action is enough to justify
4888 * canceling read-auto mode
4891 md_wakeup_thread(mddev
->sync_thread
);
4893 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4894 md_wakeup_thread(mddev
->thread
);
4895 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
4899 static struct md_sysfs_entry md_scan_mode
=
4900 __ATTR_PREALLOC(sync_action
, S_IRUGO
|S_IWUSR
, action_show
, action_store
);
4903 last_sync_action_show(struct mddev
*mddev
, char *page
)
4905 return sprintf(page
, "%s\n", mddev
->last_sync_action
);
4908 static struct md_sysfs_entry md_last_scan_mode
= __ATTR_RO(last_sync_action
);
4911 mismatch_cnt_show(struct mddev
*mddev
, char *page
)
4913 return sprintf(page
, "%llu\n",
4914 (unsigned long long)
4915 atomic64_read(&mddev
->resync_mismatches
));
4918 static struct md_sysfs_entry md_mismatches
= __ATTR_RO(mismatch_cnt
);
4921 sync_min_show(struct mddev
*mddev
, char *page
)
4923 return sprintf(page
, "%d (%s)\n", speed_min(mddev
),
4924 mddev
->sync_speed_min
? "local": "system");
4928 sync_min_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4933 if (strncmp(buf
, "system", 6)==0) {
4936 rv
= kstrtouint(buf
, 10, &min
);
4942 mddev
->sync_speed_min
= min
;
4946 static struct md_sysfs_entry md_sync_min
=
4947 __ATTR(sync_speed_min
, S_IRUGO
|S_IWUSR
, sync_min_show
, sync_min_store
);
4950 sync_max_show(struct mddev
*mddev
, char *page
)
4952 return sprintf(page
, "%d (%s)\n", speed_max(mddev
),
4953 mddev
->sync_speed_max
? "local": "system");
4957 sync_max_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4962 if (strncmp(buf
, "system", 6)==0) {
4965 rv
= kstrtouint(buf
, 10, &max
);
4971 mddev
->sync_speed_max
= max
;
4975 static struct md_sysfs_entry md_sync_max
=
4976 __ATTR(sync_speed_max
, S_IRUGO
|S_IWUSR
, sync_max_show
, sync_max_store
);
4979 degraded_show(struct mddev
*mddev
, char *page
)
4981 return sprintf(page
, "%d\n", mddev
->degraded
);
4983 static struct md_sysfs_entry md_degraded
= __ATTR_RO(degraded
);
4986 sync_force_parallel_show(struct mddev
*mddev
, char *page
)
4988 return sprintf(page
, "%d\n", mddev
->parallel_resync
);
4992 sync_force_parallel_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4996 if (kstrtol(buf
, 10, &n
))
4999 if (n
!= 0 && n
!= 1)
5002 mddev
->parallel_resync
= n
;
5004 if (mddev
->sync_thread
)
5005 wake_up(&resync_wait
);
5010 /* force parallel resync, even with shared block devices */
5011 static struct md_sysfs_entry md_sync_force_parallel
=
5012 __ATTR(sync_force_parallel
, S_IRUGO
|S_IWUSR
,
5013 sync_force_parallel_show
, sync_force_parallel_store
);
5016 sync_speed_show(struct mddev
*mddev
, char *page
)
5018 unsigned long resync
, dt
, db
;
5019 if (mddev
->curr_resync
== MD_RESYNC_NONE
)
5020 return sprintf(page
, "none\n");
5021 resync
= mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
);
5022 dt
= (jiffies
- mddev
->resync_mark
) / HZ
;
5024 db
= resync
- mddev
->resync_mark_cnt
;
5025 return sprintf(page
, "%lu\n", db
/dt
/2); /* K/sec */
5028 static struct md_sysfs_entry md_sync_speed
= __ATTR_RO(sync_speed
);
5031 sync_completed_show(struct mddev
*mddev
, char *page
)
5033 unsigned long long max_sectors
, resync
;
5035 if (!test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
5036 return sprintf(page
, "none\n");
5038 if (mddev
->curr_resync
== MD_RESYNC_YIELDED
||
5039 mddev
->curr_resync
== MD_RESYNC_DELAYED
)
5040 return sprintf(page
, "delayed\n");
5042 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
5043 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
5044 max_sectors
= mddev
->resync_max_sectors
;
5046 max_sectors
= mddev
->dev_sectors
;
5048 resync
= mddev
->curr_resync_completed
;
5049 return sprintf(page
, "%llu / %llu\n", resync
, max_sectors
);
5052 static struct md_sysfs_entry md_sync_completed
=
5053 __ATTR_PREALLOC(sync_completed
, S_IRUGO
, sync_completed_show
, NULL
);
5056 min_sync_show(struct mddev
*mddev
, char *page
)
5058 return sprintf(page
, "%llu\n",
5059 (unsigned long long)mddev
->resync_min
);
5062 min_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
5064 unsigned long long min
;
5067 if (kstrtoull(buf
, 10, &min
))
5070 spin_lock(&mddev
->lock
);
5072 if (min
> mddev
->resync_max
)
5076 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
5079 /* Round down to multiple of 4K for safety */
5080 mddev
->resync_min
= round_down(min
, 8);
5084 spin_unlock(&mddev
->lock
);
5088 static struct md_sysfs_entry md_min_sync
=
5089 __ATTR(sync_min
, S_IRUGO
|S_IWUSR
, min_sync_show
, min_sync_store
);
5092 max_sync_show(struct mddev
*mddev
, char *page
)
5094 if (mddev
->resync_max
== MaxSector
)
5095 return sprintf(page
, "max\n");
5097 return sprintf(page
, "%llu\n",
5098 (unsigned long long)mddev
->resync_max
);
5101 max_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
5104 spin_lock(&mddev
->lock
);
5105 if (strncmp(buf
, "max", 3) == 0)
5106 mddev
->resync_max
= MaxSector
;
5108 unsigned long long max
;
5112 if (kstrtoull(buf
, 10, &max
))
5114 if (max
< mddev
->resync_min
)
5118 if (max
< mddev
->resync_max
&&
5120 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
5123 /* Must be a multiple of chunk_size */
5124 chunk
= mddev
->chunk_sectors
;
5126 sector_t temp
= max
;
5129 if (sector_div(temp
, chunk
))
5132 mddev
->resync_max
= max
;
5134 wake_up(&mddev
->recovery_wait
);
5137 spin_unlock(&mddev
->lock
);
5141 static struct md_sysfs_entry md_max_sync
=
5142 __ATTR(sync_max
, S_IRUGO
|S_IWUSR
, max_sync_show
, max_sync_store
);
5145 suspend_lo_show(struct mddev
*mddev
, char *page
)
5147 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_lo
);
5151 suspend_lo_store(struct mddev
*mddev
, const char *buf
, size_t len
)
5153 unsigned long long new;
5156 err
= kstrtoull(buf
, 10, &new);
5159 if (new != (sector_t
)new)
5162 err
= mddev_lock(mddev
);
5166 if (mddev
->pers
== NULL
||
5167 mddev
->pers
->quiesce
== NULL
)
5169 mddev_suspend(mddev
);
5170 mddev
->suspend_lo
= new;
5171 mddev_resume(mddev
);
5175 mddev_unlock(mddev
);
5178 static struct md_sysfs_entry md_suspend_lo
=
5179 __ATTR(suspend_lo
, S_IRUGO
|S_IWUSR
, suspend_lo_show
, suspend_lo_store
);
5182 suspend_hi_show(struct mddev
*mddev
, char *page
)
5184 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_hi
);
5188 suspend_hi_store(struct mddev
*mddev
, const char *buf
, size_t len
)
5190 unsigned long long new;
5193 err
= kstrtoull(buf
, 10, &new);
5196 if (new != (sector_t
)new)
5199 err
= mddev_lock(mddev
);
5203 if (mddev
->pers
== NULL
)
5206 mddev_suspend(mddev
);
5207 mddev
->suspend_hi
= new;
5208 mddev_resume(mddev
);
5212 mddev_unlock(mddev
);
5215 static struct md_sysfs_entry md_suspend_hi
=
5216 __ATTR(suspend_hi
, S_IRUGO
|S_IWUSR
, suspend_hi_show
, suspend_hi_store
);
5219 reshape_position_show(struct mddev
*mddev
, char *page
)
5221 if (mddev
->reshape_position
!= MaxSector
)
5222 return sprintf(page
, "%llu\n",
5223 (unsigned long long)mddev
->reshape_position
);
5224 strcpy(page
, "none\n");
5229 reshape_position_store(struct mddev
*mddev
, const char *buf
, size_t len
)
5231 struct md_rdev
*rdev
;
5232 unsigned long long new;
5235 err
= kstrtoull(buf
, 10, &new);
5238 if (new != (sector_t
)new)
5240 err
= mddev_lock(mddev
);
5246 mddev
->reshape_position
= new;
5247 mddev
->delta_disks
= 0;
5248 mddev
->reshape_backwards
= 0;
5249 mddev
->new_level
= mddev
->level
;
5250 mddev
->new_layout
= mddev
->layout
;
5251 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
5252 rdev_for_each(rdev
, mddev
)
5253 rdev
->new_data_offset
= rdev
->data_offset
;
5256 mddev_unlock(mddev
);
5260 static struct md_sysfs_entry md_reshape_position
=
5261 __ATTR(reshape_position
, S_IRUGO
|S_IWUSR
, reshape_position_show
,
5262 reshape_position_store
);
5265 reshape_direction_show(struct mddev
*mddev
, char *page
)
5267 return sprintf(page
, "%s\n",
5268 mddev
->reshape_backwards
? "backwards" : "forwards");
5272 reshape_direction_store(struct mddev
*mddev
, const char *buf
, size_t len
)
5277 if (cmd_match(buf
, "forwards"))
5279 else if (cmd_match(buf
, "backwards"))
5283 if (mddev
->reshape_backwards
== backwards
)
5286 err
= mddev_lock(mddev
);
5289 /* check if we are allowed to change */
5290 if (mddev
->delta_disks
)
5292 else if (mddev
->persistent
&&
5293 mddev
->major_version
== 0)
5296 mddev
->reshape_backwards
= backwards
;
5297 mddev_unlock(mddev
);
5301 static struct md_sysfs_entry md_reshape_direction
=
5302 __ATTR(reshape_direction
, S_IRUGO
|S_IWUSR
, reshape_direction_show
,
5303 reshape_direction_store
);
5306 array_size_show(struct mddev
*mddev
, char *page
)
5308 if (mddev
->external_size
)
5309 return sprintf(page
, "%llu\n",
5310 (unsigned long long)mddev
->array_sectors
/2);
5312 return sprintf(page
, "default\n");
5316 array_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
5321 err
= mddev_lock(mddev
);
5325 /* cluster raid doesn't support change array_sectors */
5326 if (mddev_is_clustered(mddev
)) {
5327 mddev_unlock(mddev
);
5331 if (strncmp(buf
, "default", 7) == 0) {
5333 sectors
= mddev
->pers
->size(mddev
, 0, 0);
5335 sectors
= mddev
->array_sectors
;
5337 mddev
->external_size
= 0;
5339 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
5341 else if (mddev
->pers
&& mddev
->pers
->size(mddev
, 0, 0) < sectors
)
5344 mddev
->external_size
= 1;
5348 mddev
->array_sectors
= sectors
;
5350 set_capacity_and_notify(mddev
->gendisk
,
5351 mddev
->array_sectors
);
5353 mddev_unlock(mddev
);
5357 static struct md_sysfs_entry md_array_size
=
5358 __ATTR(array_size
, S_IRUGO
|S_IWUSR
, array_size_show
,
5362 consistency_policy_show(struct mddev
*mddev
, char *page
)
5366 if (test_bit(MD_HAS_JOURNAL
, &mddev
->flags
)) {
5367 ret
= sprintf(page
, "journal\n");
5368 } else if (test_bit(MD_HAS_PPL
, &mddev
->flags
)) {
5369 ret
= sprintf(page
, "ppl\n");
5370 } else if (mddev
->bitmap
) {
5371 ret
= sprintf(page
, "bitmap\n");
5372 } else if (mddev
->pers
) {
5373 if (mddev
->pers
->sync_request
)
5374 ret
= sprintf(page
, "resync\n");
5376 ret
= sprintf(page
, "none\n");
5378 ret
= sprintf(page
, "unknown\n");
5385 consistency_policy_store(struct mddev
*mddev
, const char *buf
, size_t len
)
5390 if (mddev
->pers
->change_consistency_policy
)
5391 err
= mddev
->pers
->change_consistency_policy(mddev
, buf
);
5394 } else if (mddev
->external
&& strncmp(buf
, "ppl", 3) == 0) {
5395 set_bit(MD_HAS_PPL
, &mddev
->flags
);
5400 return err
? err
: len
;
5403 static struct md_sysfs_entry md_consistency_policy
=
5404 __ATTR(consistency_policy
, S_IRUGO
| S_IWUSR
, consistency_policy_show
,
5405 consistency_policy_store
);
5407 static ssize_t
fail_last_dev_show(struct mddev
*mddev
, char *page
)
5409 return sprintf(page
, "%d\n", mddev
->fail_last_dev
);
5413 * Setting fail_last_dev to true to allow last device to be forcibly removed
5414 * from RAID1/RAID10.
5417 fail_last_dev_store(struct mddev
*mddev
, const char *buf
, size_t len
)
5422 ret
= kstrtobool(buf
, &value
);
5426 if (value
!= mddev
->fail_last_dev
)
5427 mddev
->fail_last_dev
= value
;
5431 static struct md_sysfs_entry md_fail_last_dev
=
5432 __ATTR(fail_last_dev
, S_IRUGO
| S_IWUSR
, fail_last_dev_show
,
5433 fail_last_dev_store
);
5435 static ssize_t
serialize_policy_show(struct mddev
*mddev
, char *page
)
5437 if (mddev
->pers
== NULL
|| (mddev
->pers
->level
!= 1))
5438 return sprintf(page
, "n/a\n");
5440 return sprintf(page
, "%d\n", mddev
->serialize_policy
);
5444 * Setting serialize_policy to true to enforce write IO is not reordered
5448 serialize_policy_store(struct mddev
*mddev
, const char *buf
, size_t len
)
5453 err
= kstrtobool(buf
, &value
);
5457 if (value
== mddev
->serialize_policy
)
5460 err
= mddev_lock(mddev
);
5463 if (mddev
->pers
== NULL
|| (mddev
->pers
->level
!= 1)) {
5464 pr_err("md: serialize_policy is only effective for raid1\n");
5469 mddev_suspend(mddev
);
5471 mddev_create_serial_pool(mddev
, NULL
, true);
5473 mddev_destroy_serial_pool(mddev
, NULL
, true);
5474 mddev
->serialize_policy
= value
;
5475 mddev_resume(mddev
);
5477 mddev_unlock(mddev
);
5481 static struct md_sysfs_entry md_serialize_policy
=
5482 __ATTR(serialize_policy
, S_IRUGO
| S_IWUSR
, serialize_policy_show
,
5483 serialize_policy_store
);
5486 static struct attribute
*md_default_attrs
[] = {
5489 &md_raid_disks
.attr
,
5491 &md_chunk_size
.attr
,
5493 &md_resync_start
.attr
,
5495 &md_new_device
.attr
,
5496 &md_safe_delay
.attr
,
5497 &md_array_state
.attr
,
5498 &md_reshape_position
.attr
,
5499 &md_reshape_direction
.attr
,
5500 &md_array_size
.attr
,
5501 &max_corr_read_errors
.attr
,
5502 &md_consistency_policy
.attr
,
5503 &md_fail_last_dev
.attr
,
5504 &md_serialize_policy
.attr
,
5508 static const struct attribute_group md_default_group
= {
5509 .attrs
= md_default_attrs
,
5512 static struct attribute
*md_redundancy_attrs
[] = {
5514 &md_last_scan_mode
.attr
,
5515 &md_mismatches
.attr
,
5518 &md_sync_speed
.attr
,
5519 &md_sync_force_parallel
.attr
,
5520 &md_sync_completed
.attr
,
5523 &md_suspend_lo
.attr
,
5524 &md_suspend_hi
.attr
,
5529 static const struct attribute_group md_redundancy_group
= {
5531 .attrs
= md_redundancy_attrs
,
5534 static const struct attribute_group
*md_attr_groups
[] = {
5541 md_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
5543 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
5544 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
5549 spin_lock(&all_mddevs_lock
);
5550 if (list_empty(&mddev
->all_mddevs
)) {
5551 spin_unlock(&all_mddevs_lock
);
5555 spin_unlock(&all_mddevs_lock
);
5557 rv
= entry
->show(mddev
, page
);
5563 md_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
5564 const char *page
, size_t length
)
5566 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
5567 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
5572 if (!capable(CAP_SYS_ADMIN
))
5574 spin_lock(&all_mddevs_lock
);
5575 if (list_empty(&mddev
->all_mddevs
)) {
5576 spin_unlock(&all_mddevs_lock
);
5580 spin_unlock(&all_mddevs_lock
);
5581 rv
= entry
->store(mddev
, page
, length
);
5586 static void md_kobj_release(struct kobject
*ko
)
5588 struct mddev
*mddev
= container_of(ko
, struct mddev
, kobj
);
5590 if (mddev
->sysfs_state
)
5591 sysfs_put(mddev
->sysfs_state
);
5592 if (mddev
->sysfs_level
)
5593 sysfs_put(mddev
->sysfs_level
);
5595 del_gendisk(mddev
->gendisk
);
5596 put_disk(mddev
->gendisk
);
5599 static const struct sysfs_ops md_sysfs_ops
= {
5600 .show
= md_attr_show
,
5601 .store
= md_attr_store
,
5603 static struct kobj_type md_ktype
= {
5604 .release
= md_kobj_release
,
5605 .sysfs_ops
= &md_sysfs_ops
,
5606 .default_groups
= md_attr_groups
,
5611 static void mddev_delayed_delete(struct work_struct
*ws
)
5613 struct mddev
*mddev
= container_of(ws
, struct mddev
, del_work
);
5615 kobject_put(&mddev
->kobj
);
5618 static void no_op(struct percpu_ref
*r
) {}
5620 int mddev_init_writes_pending(struct mddev
*mddev
)
5622 if (mddev
->writes_pending
.percpu_count_ptr
)
5624 if (percpu_ref_init(&mddev
->writes_pending
, no_op
,
5625 PERCPU_REF_ALLOW_REINIT
, GFP_KERNEL
) < 0)
5627 /* We want to start with the refcount at zero */
5628 percpu_ref_put(&mddev
->writes_pending
);
5631 EXPORT_SYMBOL_GPL(mddev_init_writes_pending
);
5633 int md_alloc(dev_t dev
, char *name
)
5636 * If dev is zero, name is the name of a device to allocate with
5637 * an arbitrary minor number. It will be "md_???"
5638 * If dev is non-zero it must be a device number with a MAJOR of
5639 * MD_MAJOR or mdp_major. In this case, if "name" is NULL, then
5640 * the device is being created by opening a node in /dev.
5641 * If "name" is not NULL, the device is being created by
5642 * writing to /sys/module/md_mod/parameters/new_array.
5644 static DEFINE_MUTEX(disks_mutex
);
5645 struct mddev
*mddev
;
5646 struct gendisk
*disk
;
5653 * Wait for any previous instance of this device to be completely
5654 * removed (mddev_delayed_delete).
5656 flush_workqueue(md_misc_wq
);
5658 mutex_lock(&disks_mutex
);
5659 mddev
= mddev_alloc(dev
);
5660 if (IS_ERR(mddev
)) {
5661 error
= PTR_ERR(mddev
);
5665 partitioned
= (MAJOR(mddev
->unit
) != MD_MAJOR
);
5666 shift
= partitioned
? MdpMinorShift
: 0;
5667 unit
= MINOR(mddev
->unit
) >> shift
;
5670 /* Need to ensure that 'name' is not a duplicate.
5672 struct mddev
*mddev2
;
5673 spin_lock(&all_mddevs_lock
);
5675 list_for_each_entry(mddev2
, &all_mddevs
, all_mddevs
)
5676 if (mddev2
->gendisk
&&
5677 strcmp(mddev2
->gendisk
->disk_name
, name
) == 0) {
5678 spin_unlock(&all_mddevs_lock
);
5680 goto out_free_mddev
;
5682 spin_unlock(&all_mddevs_lock
);
5686 * Creating /dev/mdNNN via "newarray", so adjust hold_active.
5688 mddev
->hold_active
= UNTIL_STOP
;
5691 disk
= blk_alloc_disk(NUMA_NO_NODE
);
5693 goto out_free_mddev
;
5695 disk
->major
= MAJOR(mddev
->unit
);
5696 disk
->first_minor
= unit
<< shift
;
5697 disk
->minors
= 1 << shift
;
5699 strcpy(disk
->disk_name
, name
);
5700 else if (partitioned
)
5701 sprintf(disk
->disk_name
, "md_d%d", unit
);
5703 sprintf(disk
->disk_name
, "md%d", unit
);
5704 disk
->fops
= &md_fops
;
5705 disk
->private_data
= mddev
;
5707 mddev
->queue
= disk
->queue
;
5708 blk_set_stacking_limits(&mddev
->queue
->limits
);
5709 blk_queue_write_cache(mddev
->queue
, true, true);
5710 disk
->events
|= DISK_EVENT_MEDIA_CHANGE
;
5711 mddev
->gendisk
= disk
;
5712 error
= add_disk(disk
);
5716 kobject_init(&mddev
->kobj
, &md_ktype
);
5717 error
= kobject_add(&mddev
->kobj
, &disk_to_dev(disk
)->kobj
, "%s", "md");
5720 * The disk is already live at this point. Clear the hold flag
5721 * and let mddev_put take care of the deletion, as it isn't any
5722 * different from a normal close on last release now.
5724 mddev
->hold_active
= 0;
5728 kobject_uevent(&mddev
->kobj
, KOBJ_ADD
);
5729 mddev
->sysfs_state
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "array_state");
5730 mddev
->sysfs_level
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "level");
5733 mutex_unlock(&disks_mutex
);
5742 mutex_unlock(&disks_mutex
);
5746 static void md_probe(dev_t dev
)
5748 if (MAJOR(dev
) == MD_MAJOR
&& MINOR(dev
) >= 512)
5751 md_alloc(dev
, NULL
);
5754 static int add_named_array(const char *val
, const struct kernel_param
*kp
)
5757 * val must be "md_*" or "mdNNN".
5758 * For "md_*" we allocate an array with a large free minor number, and
5759 * set the name to val. val must not already be an active name.
5760 * For "mdNNN" we allocate an array with the minor number NNN
5761 * which must not already be in use.
5763 int len
= strlen(val
);
5764 char buf
[DISK_NAME_LEN
];
5765 unsigned long devnum
;
5767 while (len
&& val
[len
-1] == '\n')
5769 if (len
>= DISK_NAME_LEN
)
5771 strscpy(buf
, val
, len
+1);
5772 if (strncmp(buf
, "md_", 3) == 0)
5773 return md_alloc(0, buf
);
5774 if (strncmp(buf
, "md", 2) == 0 &&
5776 kstrtoul(buf
+2, 10, &devnum
) == 0 &&
5777 devnum
<= MINORMASK
)
5778 return md_alloc(MKDEV(MD_MAJOR
, devnum
), NULL
);
5783 static void md_safemode_timeout(struct timer_list
*t
)
5785 struct mddev
*mddev
= from_timer(mddev
, t
, safemode_timer
);
5787 mddev
->safemode
= 1;
5788 if (mddev
->external
)
5789 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5791 md_wakeup_thread(mddev
->thread
);
5794 static int start_dirty_degraded
;
5796 int md_run(struct mddev
*mddev
)
5799 struct md_rdev
*rdev
;
5800 struct md_personality
*pers
;
5803 if (list_empty(&mddev
->disks
))
5804 /* cannot run an array with no devices.. */
5809 /* Cannot run until previous stop completes properly */
5810 if (mddev
->sysfs_active
)
5814 * Analyze all RAID superblock(s)
5816 if (!mddev
->raid_disks
) {
5817 if (!mddev
->persistent
)
5819 err
= analyze_sbs(mddev
);
5824 if (mddev
->level
!= LEVEL_NONE
)
5825 request_module("md-level-%d", mddev
->level
);
5826 else if (mddev
->clevel
[0])
5827 request_module("md-%s", mddev
->clevel
);
5830 * Drop all container device buffers, from now on
5831 * the only valid external interface is through the md
5834 mddev
->has_superblocks
= false;
5835 rdev_for_each(rdev
, mddev
) {
5836 if (test_bit(Faulty
, &rdev
->flags
))
5838 sync_blockdev(rdev
->bdev
);
5839 invalidate_bdev(rdev
->bdev
);
5840 if (mddev
->ro
!= 1 && rdev_read_only(rdev
)) {
5843 set_disk_ro(mddev
->gendisk
, 1);
5847 mddev
->has_superblocks
= true;
5849 /* perform some consistency tests on the device.
5850 * We don't want the data to overlap the metadata,
5851 * Internal Bitmap issues have been handled elsewhere.
5853 if (rdev
->meta_bdev
) {
5854 /* Nothing to check */;
5855 } else if (rdev
->data_offset
< rdev
->sb_start
) {
5856 if (mddev
->dev_sectors
&&
5857 rdev
->data_offset
+ mddev
->dev_sectors
5859 pr_warn("md: %s: data overlaps metadata\n",
5864 if (rdev
->sb_start
+ rdev
->sb_size
/512
5865 > rdev
->data_offset
) {
5866 pr_warn("md: %s: metadata overlaps data\n",
5871 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
5872 nowait
= nowait
&& blk_queue_nowait(bdev_get_queue(rdev
->bdev
));
5875 if (!bioset_initialized(&mddev
->bio_set
)) {
5876 err
= bioset_init(&mddev
->bio_set
, BIO_POOL_SIZE
, 0, BIOSET_NEED_BVECS
);
5880 if (!bioset_initialized(&mddev
->sync_set
)) {
5881 err
= bioset_init(&mddev
->sync_set
, BIO_POOL_SIZE
, 0, BIOSET_NEED_BVECS
);
5886 spin_lock(&pers_lock
);
5887 pers
= find_pers(mddev
->level
, mddev
->clevel
);
5888 if (!pers
|| !try_module_get(pers
->owner
)) {
5889 spin_unlock(&pers_lock
);
5890 if (mddev
->level
!= LEVEL_NONE
)
5891 pr_warn("md: personality for level %d is not loaded!\n",
5894 pr_warn("md: personality for level %s is not loaded!\n",
5899 spin_unlock(&pers_lock
);
5900 if (mddev
->level
!= pers
->level
) {
5901 mddev
->level
= pers
->level
;
5902 mddev
->new_level
= pers
->level
;
5904 strscpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
5906 if (mddev
->reshape_position
!= MaxSector
&&
5907 pers
->start_reshape
== NULL
) {
5908 /* This personality cannot handle reshaping... */
5909 module_put(pers
->owner
);
5914 if (pers
->sync_request
) {
5915 /* Warn if this is a potentially silly
5918 struct md_rdev
*rdev2
;
5921 rdev_for_each(rdev
, mddev
)
5922 rdev_for_each(rdev2
, mddev
) {
5924 rdev
->bdev
->bd_disk
==
5925 rdev2
->bdev
->bd_disk
) {
5926 pr_warn("%s: WARNING: %pg appears to be on the same physical disk as %pg.\n",
5935 pr_warn("True protection against single-disk failure might be compromised.\n");
5938 mddev
->recovery
= 0;
5939 /* may be over-ridden by personality */
5940 mddev
->resync_max_sectors
= mddev
->dev_sectors
;
5942 mddev
->ok_start_degraded
= start_dirty_degraded
;
5944 if (start_readonly
&& mddev
->ro
== 0)
5945 mddev
->ro
= 2; /* read-only, but switch on first write */
5947 err
= pers
->run(mddev
);
5949 pr_warn("md: pers->run() failed ...\n");
5950 else if (pers
->size(mddev
, 0, 0) < mddev
->array_sectors
) {
5951 WARN_ONCE(!mddev
->external_size
,
5952 "%s: default size too small, but 'external_size' not in effect?\n",
5954 pr_warn("md: invalid array_size %llu > default size %llu\n",
5955 (unsigned long long)mddev
->array_sectors
/ 2,
5956 (unsigned long long)pers
->size(mddev
, 0, 0) / 2);
5959 if (err
== 0 && pers
->sync_request
&&
5960 (mddev
->bitmap_info
.file
|| mddev
->bitmap_info
.offset
)) {
5961 struct bitmap
*bitmap
;
5963 bitmap
= md_bitmap_create(mddev
, -1);
5964 if (IS_ERR(bitmap
)) {
5965 err
= PTR_ERR(bitmap
);
5966 pr_warn("%s: failed to create bitmap (%d)\n",
5967 mdname(mddev
), err
);
5969 mddev
->bitmap
= bitmap
;
5975 if (mddev
->bitmap_info
.max_write_behind
> 0) {
5976 bool create_pool
= false;
5978 rdev_for_each(rdev
, mddev
) {
5979 if (test_bit(WriteMostly
, &rdev
->flags
) &&
5980 rdev_init_serial(rdev
))
5983 if (create_pool
&& mddev
->serial_info_pool
== NULL
) {
5984 mddev
->serial_info_pool
=
5985 mempool_create_kmalloc_pool(NR_SERIAL_INFOS
,
5986 sizeof(struct serial_info
));
5987 if (!mddev
->serial_info_pool
) {
5997 rdev_for_each(rdev
, mddev
) {
5998 if (rdev
->raid_disk
>= 0 && !bdev_nonrot(rdev
->bdev
)) {
6003 if (mddev
->degraded
)
6006 blk_queue_flag_set(QUEUE_FLAG_NONROT
, mddev
->queue
);
6008 blk_queue_flag_clear(QUEUE_FLAG_NONROT
, mddev
->queue
);
6009 blk_queue_flag_set(QUEUE_FLAG_IO_STAT
, mddev
->queue
);
6011 /* Set the NOWAIT flags if all underlying devices support it */
6013 blk_queue_flag_set(QUEUE_FLAG_NOWAIT
, mddev
->queue
);
6015 if (pers
->sync_request
) {
6016 if (mddev
->kobj
.sd
&&
6017 sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
6018 pr_warn("md: cannot register extra attributes for %s\n",
6020 mddev
->sysfs_action
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "sync_action");
6021 mddev
->sysfs_completed
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "sync_completed");
6022 mddev
->sysfs_degraded
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "degraded");
6023 } else if (mddev
->ro
== 2) /* auto-readonly not meaningful */
6026 atomic_set(&mddev
->max_corr_read_errors
,
6027 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS
);
6028 mddev
->safemode
= 0;
6029 if (mddev_is_clustered(mddev
))
6030 mddev
->safemode_delay
= 0;
6032 mddev
->safemode_delay
= DEFAULT_SAFEMODE_DELAY
;
6035 spin_lock(&mddev
->lock
);
6037 spin_unlock(&mddev
->lock
);
6038 rdev_for_each(rdev
, mddev
)
6039 if (rdev
->raid_disk
>= 0)
6040 sysfs_link_rdev(mddev
, rdev
); /* failure here is OK */
6042 if (mddev
->degraded
&& !mddev
->ro
)
6043 /* This ensures that recovering status is reported immediately
6044 * via sysfs - until a lack of spares is confirmed.
6046 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
6047 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6049 if (mddev
->sb_flags
)
6050 md_update_sb(mddev
, 0);
6056 mddev_detach(mddev
);
6058 pers
->free(mddev
, mddev
->private);
6059 mddev
->private = NULL
;
6060 module_put(pers
->owner
);
6061 md_bitmap_destroy(mddev
);
6063 bioset_exit(&mddev
->sync_set
);
6065 bioset_exit(&mddev
->bio_set
);
6068 EXPORT_SYMBOL_GPL(md_run
);
6070 int do_md_run(struct mddev
*mddev
)
6074 set_bit(MD_NOT_READY
, &mddev
->flags
);
6075 err
= md_run(mddev
);
6078 err
= md_bitmap_load(mddev
);
6080 md_bitmap_destroy(mddev
);
6084 if (mddev_is_clustered(mddev
))
6085 md_allow_write(mddev
);
6087 /* run start up tasks that require md_thread */
6090 md_wakeup_thread(mddev
->thread
);
6091 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
6093 set_capacity_and_notify(mddev
->gendisk
, mddev
->array_sectors
);
6094 clear_bit(MD_NOT_READY
, &mddev
->flags
);
6096 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
6097 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6098 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
6099 sysfs_notify_dirent_safe(mddev
->sysfs_degraded
);
6101 clear_bit(MD_NOT_READY
, &mddev
->flags
);
6105 int md_start(struct mddev
*mddev
)
6109 if (mddev
->pers
->start
) {
6110 set_bit(MD_RECOVERY_WAIT
, &mddev
->recovery
);
6111 md_wakeup_thread(mddev
->thread
);
6112 ret
= mddev
->pers
->start(mddev
);
6113 clear_bit(MD_RECOVERY_WAIT
, &mddev
->recovery
);
6114 md_wakeup_thread(mddev
->sync_thread
);
6118 EXPORT_SYMBOL_GPL(md_start
);
6120 static int restart_array(struct mddev
*mddev
)
6122 struct gendisk
*disk
= mddev
->gendisk
;
6123 struct md_rdev
*rdev
;
6124 bool has_journal
= false;
6125 bool has_readonly
= false;
6127 /* Complain if it has no devices */
6128 if (list_empty(&mddev
->disks
))
6136 rdev_for_each_rcu(rdev
, mddev
) {
6137 if (test_bit(Journal
, &rdev
->flags
) &&
6138 !test_bit(Faulty
, &rdev
->flags
))
6140 if (rdev_read_only(rdev
))
6141 has_readonly
= true;
6144 if (test_bit(MD_HAS_JOURNAL
, &mddev
->flags
) && !has_journal
)
6145 /* Don't restart rw with journal missing/faulty */
6150 mddev
->safemode
= 0;
6152 set_disk_ro(disk
, 0);
6153 pr_debug("md: %s switched to read-write mode.\n", mdname(mddev
));
6154 /* Kick recovery or resync if necessary */
6155 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6156 md_wakeup_thread(mddev
->thread
);
6157 md_wakeup_thread(mddev
->sync_thread
);
6158 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6162 static void md_clean(struct mddev
*mddev
)
6164 mddev
->array_sectors
= 0;
6165 mddev
->external_size
= 0;
6166 mddev
->dev_sectors
= 0;
6167 mddev
->raid_disks
= 0;
6168 mddev
->recovery_cp
= 0;
6169 mddev
->resync_min
= 0;
6170 mddev
->resync_max
= MaxSector
;
6171 mddev
->reshape_position
= MaxSector
;
6172 mddev
->external
= 0;
6173 mddev
->persistent
= 0;
6174 mddev
->level
= LEVEL_NONE
;
6175 mddev
->clevel
[0] = 0;
6177 mddev
->sb_flags
= 0;
6179 mddev
->metadata_type
[0] = 0;
6180 mddev
->chunk_sectors
= 0;
6181 mddev
->ctime
= mddev
->utime
= 0;
6183 mddev
->max_disks
= 0;
6185 mddev
->can_decrease_events
= 0;
6186 mddev
->delta_disks
= 0;
6187 mddev
->reshape_backwards
= 0;
6188 mddev
->new_level
= LEVEL_NONE
;
6189 mddev
->new_layout
= 0;
6190 mddev
->new_chunk_sectors
= 0;
6191 mddev
->curr_resync
= 0;
6192 atomic64_set(&mddev
->resync_mismatches
, 0);
6193 mddev
->suspend_lo
= mddev
->suspend_hi
= 0;
6194 mddev
->sync_speed_min
= mddev
->sync_speed_max
= 0;
6195 mddev
->recovery
= 0;
6198 mddev
->degraded
= 0;
6199 mddev
->safemode
= 0;
6200 mddev
->private = NULL
;
6201 mddev
->cluster_info
= NULL
;
6202 mddev
->bitmap_info
.offset
= 0;
6203 mddev
->bitmap_info
.default_offset
= 0;
6204 mddev
->bitmap_info
.default_space
= 0;
6205 mddev
->bitmap_info
.chunksize
= 0;
6206 mddev
->bitmap_info
.daemon_sleep
= 0;
6207 mddev
->bitmap_info
.max_write_behind
= 0;
6208 mddev
->bitmap_info
.nodes
= 0;
6211 static void __md_stop_writes(struct mddev
*mddev
)
6213 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
6214 if (work_pending(&mddev
->del_work
))
6215 flush_workqueue(md_misc_wq
);
6216 if (mddev
->sync_thread
) {
6217 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6218 md_unregister_thread(&mddev
->sync_thread
);
6219 md_reap_sync_thread(mddev
);
6222 del_timer_sync(&mddev
->safemode_timer
);
6224 if (mddev
->pers
&& mddev
->pers
->quiesce
) {
6225 mddev
->pers
->quiesce(mddev
, 1);
6226 mddev
->pers
->quiesce(mddev
, 0);
6228 md_bitmap_flush(mddev
);
6230 if (mddev
->ro
== 0 &&
6231 ((!mddev
->in_sync
&& !mddev_is_clustered(mddev
)) ||
6233 /* mark array as shutdown cleanly */
6234 if (!mddev_is_clustered(mddev
))
6236 md_update_sb(mddev
, 1);
6238 /* disable policy to guarantee rdevs free resources for serialization */
6239 mddev
->serialize_policy
= 0;
6240 mddev_destroy_serial_pool(mddev
, NULL
, true);
6243 void md_stop_writes(struct mddev
*mddev
)
6245 mddev_lock_nointr(mddev
);
6246 __md_stop_writes(mddev
);
6247 mddev_unlock(mddev
);
6249 EXPORT_SYMBOL_GPL(md_stop_writes
);
6251 static void mddev_detach(struct mddev
*mddev
)
6253 md_bitmap_wait_behind_writes(mddev
);
6254 if (mddev
->pers
&& mddev
->pers
->quiesce
&& !mddev
->suspended
) {
6255 mddev
->pers
->quiesce(mddev
, 1);
6256 mddev
->pers
->quiesce(mddev
, 0);
6258 md_unregister_thread(&mddev
->thread
);
6260 blk_sync_queue(mddev
->queue
); /* the unplug fn references 'conf'*/
6263 static void __md_stop(struct mddev
*mddev
)
6265 struct md_personality
*pers
= mddev
->pers
;
6266 md_bitmap_destroy(mddev
);
6267 mddev_detach(mddev
);
6268 /* Ensure ->event_work is done */
6269 if (mddev
->event_work
.func
)
6270 flush_workqueue(md_misc_wq
);
6271 spin_lock(&mddev
->lock
);
6273 spin_unlock(&mddev
->lock
);
6275 pers
->free(mddev
, mddev
->private);
6276 mddev
->private = NULL
;
6277 if (pers
->sync_request
&& mddev
->to_remove
== NULL
)
6278 mddev
->to_remove
= &md_redundancy_group
;
6279 module_put(pers
->owner
);
6280 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
6283 void md_stop(struct mddev
*mddev
)
6285 /* stop the array and free an attached data structures.
6286 * This is called from dm-raid
6289 bioset_exit(&mddev
->bio_set
);
6290 bioset_exit(&mddev
->sync_set
);
6293 EXPORT_SYMBOL_GPL(md_stop
);
6295 static int md_set_readonly(struct mddev
*mddev
, struct block_device
*bdev
)
6300 if (!test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
)) {
6302 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
6303 md_wakeup_thread(mddev
->thread
);
6305 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
6306 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6307 if (mddev
->sync_thread
)
6308 /* Thread might be blocked waiting for metadata update
6309 * which will now never happen */
6310 wake_up_process(mddev
->sync_thread
->tsk
);
6312 if (mddev
->external
&& test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
))
6314 mddev_unlock(mddev
);
6315 wait_event(resync_wait
, !test_bit(MD_RECOVERY_RUNNING
,
6317 wait_event(mddev
->sb_wait
,
6318 !test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
));
6319 mddev_lock_nointr(mddev
);
6321 mutex_lock(&mddev
->open_mutex
);
6322 if ((mddev
->pers
&& atomic_read(&mddev
->openers
) > !!bdev
) ||
6323 mddev
->sync_thread
||
6324 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
)) {
6325 pr_warn("md: %s still in use.\n",mdname(mddev
));
6327 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
6328 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6329 md_wakeup_thread(mddev
->thread
);
6335 __md_stop_writes(mddev
);
6341 set_disk_ro(mddev
->gendisk
, 1);
6342 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
6343 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6344 md_wakeup_thread(mddev
->thread
);
6345 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6349 mutex_unlock(&mddev
->open_mutex
);
6354 * 0 - completely stop and dis-assemble array
6355 * 2 - stop but do not disassemble array
6357 static int do_md_stop(struct mddev
*mddev
, int mode
,
6358 struct block_device
*bdev
)
6360 struct gendisk
*disk
= mddev
->gendisk
;
6361 struct md_rdev
*rdev
;
6364 if (!test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
)) {
6366 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
6367 md_wakeup_thread(mddev
->thread
);
6369 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
6370 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6371 if (mddev
->sync_thread
)
6372 /* Thread might be blocked waiting for metadata update
6373 * which will now never happen */
6374 wake_up_process(mddev
->sync_thread
->tsk
);
6376 mddev_unlock(mddev
);
6377 wait_event(resync_wait
, (mddev
->sync_thread
== NULL
&&
6378 !test_bit(MD_RECOVERY_RUNNING
,
6379 &mddev
->recovery
)));
6380 mddev_lock_nointr(mddev
);
6382 mutex_lock(&mddev
->open_mutex
);
6383 if ((mddev
->pers
&& atomic_read(&mddev
->openers
) > !!bdev
) ||
6384 mddev
->sysfs_active
||
6385 mddev
->sync_thread
||
6386 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
)) {
6387 pr_warn("md: %s still in use.\n",mdname(mddev
));
6388 mutex_unlock(&mddev
->open_mutex
);
6390 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
6391 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6392 md_wakeup_thread(mddev
->thread
);
6398 set_disk_ro(disk
, 0);
6400 __md_stop_writes(mddev
);
6403 /* tell userspace to handle 'inactive' */
6404 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6406 rdev_for_each(rdev
, mddev
)
6407 if (rdev
->raid_disk
>= 0)
6408 sysfs_unlink_rdev(mddev
, rdev
);
6410 set_capacity_and_notify(disk
, 0);
6411 mutex_unlock(&mddev
->open_mutex
);
6417 mutex_unlock(&mddev
->open_mutex
);
6419 * Free resources if final stop
6422 pr_info("md: %s stopped.\n", mdname(mddev
));
6424 if (mddev
->bitmap_info
.file
) {
6425 struct file
*f
= mddev
->bitmap_info
.file
;
6426 spin_lock(&mddev
->lock
);
6427 mddev
->bitmap_info
.file
= NULL
;
6428 spin_unlock(&mddev
->lock
);
6431 mddev
->bitmap_info
.offset
= 0;
6433 export_array(mddev
);
6436 if (mddev
->hold_active
== UNTIL_STOP
)
6437 mddev
->hold_active
= 0;
6440 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6445 static void autorun_array(struct mddev
*mddev
)
6447 struct md_rdev
*rdev
;
6450 if (list_empty(&mddev
->disks
))
6453 pr_info("md: running: ");
6455 rdev_for_each(rdev
, mddev
) {
6456 pr_cont("<%pg>", rdev
->bdev
);
6460 err
= do_md_run(mddev
);
6462 pr_warn("md: do_md_run() returned %d\n", err
);
6463 do_md_stop(mddev
, 0, NULL
);
6468 * lets try to run arrays based on all disks that have arrived
6469 * until now. (those are in pending_raid_disks)
6471 * the method: pick the first pending disk, collect all disks with
6472 * the same UUID, remove all from the pending list and put them into
6473 * the 'same_array' list. Then order this list based on superblock
6474 * update time (freshest comes first), kick out 'old' disks and
6475 * compare superblocks. If everything's fine then run it.
6477 * If "unit" is allocated, then bump its reference count
6479 static void autorun_devices(int part
)
6481 struct md_rdev
*rdev0
, *rdev
, *tmp
;
6482 struct mddev
*mddev
;
6484 pr_info("md: autorun ...\n");
6485 while (!list_empty(&pending_raid_disks
)) {
6488 LIST_HEAD(candidates
);
6489 rdev0
= list_entry(pending_raid_disks
.next
,
6490 struct md_rdev
, same_set
);
6492 pr_debug("md: considering %pg ...\n", rdev0
->bdev
);
6493 INIT_LIST_HEAD(&candidates
);
6494 rdev_for_each_list(rdev
, tmp
, &pending_raid_disks
)
6495 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
6496 pr_debug("md: adding %pg ...\n",
6498 list_move(&rdev
->same_set
, &candidates
);
6501 * now we have a set of devices, with all of them having
6502 * mostly sane superblocks. It's time to allocate the
6506 dev
= MKDEV(mdp_major
,
6507 rdev0
->preferred_minor
<< MdpMinorShift
);
6508 unit
= MINOR(dev
) >> MdpMinorShift
;
6510 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
6513 if (rdev0
->preferred_minor
!= unit
) {
6514 pr_warn("md: unit number in %pg is bad: %d\n",
6515 rdev0
->bdev
, rdev0
->preferred_minor
);
6520 mddev
= mddev_find(dev
);
6524 if (mddev_lock(mddev
))
6525 pr_warn("md: %s locked, cannot run\n", mdname(mddev
));
6526 else if (mddev
->raid_disks
|| mddev
->major_version
6527 || !list_empty(&mddev
->disks
)) {
6528 pr_warn("md: %s already running, cannot run %pg\n",
6529 mdname(mddev
), rdev0
->bdev
);
6530 mddev_unlock(mddev
);
6532 pr_debug("md: created %s\n", mdname(mddev
));
6533 mddev
->persistent
= 1;
6534 rdev_for_each_list(rdev
, tmp
, &candidates
) {
6535 list_del_init(&rdev
->same_set
);
6536 if (bind_rdev_to_array(rdev
, mddev
))
6539 autorun_array(mddev
);
6540 mddev_unlock(mddev
);
6542 /* on success, candidates will be empty, on error
6545 rdev_for_each_list(rdev
, tmp
, &candidates
) {
6546 list_del_init(&rdev
->same_set
);
6551 pr_info("md: ... autorun DONE.\n");
6553 #endif /* !MODULE */
6555 static int get_version(void __user
*arg
)
6559 ver
.major
= MD_MAJOR_VERSION
;
6560 ver
.minor
= MD_MINOR_VERSION
;
6561 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
6563 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
6569 static int get_array_info(struct mddev
*mddev
, void __user
*arg
)
6571 mdu_array_info_t info
;
6572 int nr
,working
,insync
,failed
,spare
;
6573 struct md_rdev
*rdev
;
6575 nr
= working
= insync
= failed
= spare
= 0;
6577 rdev_for_each_rcu(rdev
, mddev
) {
6579 if (test_bit(Faulty
, &rdev
->flags
))
6583 if (test_bit(In_sync
, &rdev
->flags
))
6585 else if (test_bit(Journal
, &rdev
->flags
))
6586 /* TODO: add journal count to md_u.h */
6594 info
.major_version
= mddev
->major_version
;
6595 info
.minor_version
= mddev
->minor_version
;
6596 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
6597 info
.ctime
= clamp_t(time64_t
, mddev
->ctime
, 0, U32_MAX
);
6598 info
.level
= mddev
->level
;
6599 info
.size
= mddev
->dev_sectors
/ 2;
6600 if (info
.size
!= mddev
->dev_sectors
/ 2) /* overflow */
6603 info
.raid_disks
= mddev
->raid_disks
;
6604 info
.md_minor
= mddev
->md_minor
;
6605 info
.not_persistent
= !mddev
->persistent
;
6607 info
.utime
= clamp_t(time64_t
, mddev
->utime
, 0, U32_MAX
);
6610 info
.state
= (1<<MD_SB_CLEAN
);
6611 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
6612 info
.state
|= (1<<MD_SB_BITMAP_PRESENT
);
6613 if (mddev_is_clustered(mddev
))
6614 info
.state
|= (1<<MD_SB_CLUSTERED
);
6615 info
.active_disks
= insync
;
6616 info
.working_disks
= working
;
6617 info
.failed_disks
= failed
;
6618 info
.spare_disks
= spare
;
6620 info
.layout
= mddev
->layout
;
6621 info
.chunk_size
= mddev
->chunk_sectors
<< 9;
6623 if (copy_to_user(arg
, &info
, sizeof(info
)))
6629 static int get_bitmap_file(struct mddev
*mddev
, void __user
* arg
)
6631 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
6635 file
= kzalloc(sizeof(*file
), GFP_NOIO
);
6640 spin_lock(&mddev
->lock
);
6641 /* bitmap enabled */
6642 if (mddev
->bitmap_info
.file
) {
6643 ptr
= file_path(mddev
->bitmap_info
.file
, file
->pathname
,
6644 sizeof(file
->pathname
));
6648 memmove(file
->pathname
, ptr
,
6649 sizeof(file
->pathname
)-(ptr
-file
->pathname
));
6651 spin_unlock(&mddev
->lock
);
6654 copy_to_user(arg
, file
, sizeof(*file
)))
6661 static int get_disk_info(struct mddev
*mddev
, void __user
* arg
)
6663 mdu_disk_info_t info
;
6664 struct md_rdev
*rdev
;
6666 if (copy_from_user(&info
, arg
, sizeof(info
)))
6670 rdev
= md_find_rdev_nr_rcu(mddev
, info
.number
);
6672 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
6673 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
6674 info
.raid_disk
= rdev
->raid_disk
;
6676 if (test_bit(Faulty
, &rdev
->flags
))
6677 info
.state
|= (1<<MD_DISK_FAULTY
);
6678 else if (test_bit(In_sync
, &rdev
->flags
)) {
6679 info
.state
|= (1<<MD_DISK_ACTIVE
);
6680 info
.state
|= (1<<MD_DISK_SYNC
);
6682 if (test_bit(Journal
, &rdev
->flags
))
6683 info
.state
|= (1<<MD_DISK_JOURNAL
);
6684 if (test_bit(WriteMostly
, &rdev
->flags
))
6685 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
6686 if (test_bit(FailFast
, &rdev
->flags
))
6687 info
.state
|= (1<<MD_DISK_FAILFAST
);
6689 info
.major
= info
.minor
= 0;
6690 info
.raid_disk
= -1;
6691 info
.state
= (1<<MD_DISK_REMOVED
);
6695 if (copy_to_user(arg
, &info
, sizeof(info
)))
6701 int md_add_new_disk(struct mddev
*mddev
, struct mdu_disk_info_s
*info
)
6703 struct md_rdev
*rdev
;
6704 dev_t dev
= MKDEV(info
->major
,info
->minor
);
6706 if (mddev_is_clustered(mddev
) &&
6707 !(info
->state
& ((1 << MD_DISK_CLUSTER_ADD
) | (1 << MD_DISK_CANDIDATE
)))) {
6708 pr_warn("%s: Cannot add to clustered mddev.\n",
6713 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
6716 if (!mddev
->raid_disks
) {
6718 /* expecting a device which has a superblock */
6719 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
6721 pr_warn("md: md_import_device returned %ld\n",
6723 return PTR_ERR(rdev
);
6725 if (!list_empty(&mddev
->disks
)) {
6726 struct md_rdev
*rdev0
6727 = list_entry(mddev
->disks
.next
,
6728 struct md_rdev
, same_set
);
6729 err
= super_types
[mddev
->major_version
]
6730 .load_super(rdev
, rdev0
, mddev
->minor_version
);
6732 pr_warn("md: %pg has different UUID to %pg\n",
6739 err
= bind_rdev_to_array(rdev
, mddev
);
6746 * md_add_new_disk can be used once the array is assembled
6747 * to add "hot spares". They must already have a superblock
6752 if (!mddev
->pers
->hot_add_disk
) {
6753 pr_warn("%s: personality does not support diskops!\n",
6757 if (mddev
->persistent
)
6758 rdev
= md_import_device(dev
, mddev
->major_version
,
6759 mddev
->minor_version
);
6761 rdev
= md_import_device(dev
, -1, -1);
6763 pr_warn("md: md_import_device returned %ld\n",
6765 return PTR_ERR(rdev
);
6767 /* set saved_raid_disk if appropriate */
6768 if (!mddev
->persistent
) {
6769 if (info
->state
& (1<<MD_DISK_SYNC
) &&
6770 info
->raid_disk
< mddev
->raid_disks
) {
6771 rdev
->raid_disk
= info
->raid_disk
;
6772 set_bit(In_sync
, &rdev
->flags
);
6773 clear_bit(Bitmap_sync
, &rdev
->flags
);
6775 rdev
->raid_disk
= -1;
6776 rdev
->saved_raid_disk
= rdev
->raid_disk
;
6778 super_types
[mddev
->major_version
].
6779 validate_super(mddev
, rdev
);
6780 if ((info
->state
& (1<<MD_DISK_SYNC
)) &&
6781 rdev
->raid_disk
!= info
->raid_disk
) {
6782 /* This was a hot-add request, but events doesn't
6783 * match, so reject it.
6789 clear_bit(In_sync
, &rdev
->flags
); /* just to be sure */
6790 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
6791 set_bit(WriteMostly
, &rdev
->flags
);
6793 clear_bit(WriteMostly
, &rdev
->flags
);
6794 if (info
->state
& (1<<MD_DISK_FAILFAST
))
6795 set_bit(FailFast
, &rdev
->flags
);
6797 clear_bit(FailFast
, &rdev
->flags
);
6799 if (info
->state
& (1<<MD_DISK_JOURNAL
)) {
6800 struct md_rdev
*rdev2
;
6801 bool has_journal
= false;
6803 /* make sure no existing journal disk */
6804 rdev_for_each(rdev2
, mddev
) {
6805 if (test_bit(Journal
, &rdev2
->flags
)) {
6810 if (has_journal
|| mddev
->bitmap
) {
6814 set_bit(Journal
, &rdev
->flags
);
6817 * check whether the device shows up in other nodes
6819 if (mddev_is_clustered(mddev
)) {
6820 if (info
->state
& (1 << MD_DISK_CANDIDATE
))
6821 set_bit(Candidate
, &rdev
->flags
);
6822 else if (info
->state
& (1 << MD_DISK_CLUSTER_ADD
)) {
6823 /* --add initiated by this node */
6824 err
= md_cluster_ops
->add_new_disk(mddev
, rdev
);
6832 rdev
->raid_disk
= -1;
6833 err
= bind_rdev_to_array(rdev
, mddev
);
6838 if (mddev_is_clustered(mddev
)) {
6839 if (info
->state
& (1 << MD_DISK_CANDIDATE
)) {
6841 err
= md_cluster_ops
->new_disk_ack(mddev
,
6844 md_kick_rdev_from_array(rdev
);
6848 md_cluster_ops
->add_new_disk_cancel(mddev
);
6850 err
= add_bound_rdev(rdev
);
6854 err
= add_bound_rdev(rdev
);
6859 /* otherwise, md_add_new_disk is only allowed
6860 * for major_version==0 superblocks
6862 if (mddev
->major_version
!= 0) {
6863 pr_warn("%s: ADD_NEW_DISK not supported\n", mdname(mddev
));
6867 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
6869 rdev
= md_import_device(dev
, -1, 0);
6871 pr_warn("md: error, md_import_device() returned %ld\n",
6873 return PTR_ERR(rdev
);
6875 rdev
->desc_nr
= info
->number
;
6876 if (info
->raid_disk
< mddev
->raid_disks
)
6877 rdev
->raid_disk
= info
->raid_disk
;
6879 rdev
->raid_disk
= -1;
6881 if (rdev
->raid_disk
< mddev
->raid_disks
)
6882 if (info
->state
& (1<<MD_DISK_SYNC
))
6883 set_bit(In_sync
, &rdev
->flags
);
6885 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
6886 set_bit(WriteMostly
, &rdev
->flags
);
6887 if (info
->state
& (1<<MD_DISK_FAILFAST
))
6888 set_bit(FailFast
, &rdev
->flags
);
6890 if (!mddev
->persistent
) {
6891 pr_debug("md: nonpersistent superblock ...\n");
6892 rdev
->sb_start
= bdev_nr_sectors(rdev
->bdev
);
6894 rdev
->sb_start
= calc_dev_sboffset(rdev
);
6895 rdev
->sectors
= rdev
->sb_start
;
6897 err
= bind_rdev_to_array(rdev
, mddev
);
6907 static int hot_remove_disk(struct mddev
*mddev
, dev_t dev
)
6909 struct md_rdev
*rdev
;
6914 rdev
= find_rdev(mddev
, dev
);
6918 if (rdev
->raid_disk
< 0)
6921 clear_bit(Blocked
, &rdev
->flags
);
6922 remove_and_add_spares(mddev
, rdev
);
6924 if (rdev
->raid_disk
>= 0)
6928 if (mddev_is_clustered(mddev
)) {
6929 if (md_cluster_ops
->remove_disk(mddev
, rdev
))
6933 md_kick_rdev_from_array(rdev
);
6934 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
6936 md_wakeup_thread(mddev
->thread
);
6938 md_update_sb(mddev
, 1);
6943 pr_debug("md: cannot remove active disk %pg from %s ...\n",
6944 rdev
->bdev
, mdname(mddev
));
6948 static int hot_add_disk(struct mddev
*mddev
, dev_t dev
)
6951 struct md_rdev
*rdev
;
6956 if (mddev
->major_version
!= 0) {
6957 pr_warn("%s: HOT_ADD may only be used with version-0 superblocks.\n",
6961 if (!mddev
->pers
->hot_add_disk
) {
6962 pr_warn("%s: personality does not support diskops!\n",
6967 rdev
= md_import_device(dev
, -1, 0);
6969 pr_warn("md: error, md_import_device() returned %ld\n",
6974 if (mddev
->persistent
)
6975 rdev
->sb_start
= calc_dev_sboffset(rdev
);
6977 rdev
->sb_start
= bdev_nr_sectors(rdev
->bdev
);
6979 rdev
->sectors
= rdev
->sb_start
;
6981 if (test_bit(Faulty
, &rdev
->flags
)) {
6982 pr_warn("md: can not hot-add faulty %pg disk to %s!\n",
6983 rdev
->bdev
, mdname(mddev
));
6988 clear_bit(In_sync
, &rdev
->flags
);
6990 rdev
->saved_raid_disk
= -1;
6991 err
= bind_rdev_to_array(rdev
, mddev
);
6996 * The rest should better be atomic, we can have disk failures
6997 * noticed in interrupt contexts ...
7000 rdev
->raid_disk
= -1;
7002 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
7004 md_update_sb(mddev
, 1);
7006 * If the new disk does not support REQ_NOWAIT,
7007 * disable on the whole MD.
7009 if (!blk_queue_nowait(bdev_get_queue(rdev
->bdev
))) {
7010 pr_info("%s: Disabling nowait because %pg does not support nowait\n",
7011 mdname(mddev
), rdev
->bdev
);
7012 blk_queue_flag_clear(QUEUE_FLAG_NOWAIT
, mddev
->queue
);
7015 * Kick recovery, maybe this spare has to be added to the
7016 * array immediately.
7018 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7019 md_wakeup_thread(mddev
->thread
);
7028 static int set_bitmap_file(struct mddev
*mddev
, int fd
)
7033 if (!mddev
->pers
->quiesce
|| !mddev
->thread
)
7035 if (mddev
->recovery
|| mddev
->sync_thread
)
7037 /* we should be able to change the bitmap.. */
7041 struct inode
*inode
;
7044 if (mddev
->bitmap
|| mddev
->bitmap_info
.file
)
7045 return -EEXIST
; /* cannot add when bitmap is present */
7049 pr_warn("%s: error: failed to get bitmap file\n",
7054 inode
= f
->f_mapping
->host
;
7055 if (!S_ISREG(inode
->i_mode
)) {
7056 pr_warn("%s: error: bitmap file must be a regular file\n",
7059 } else if (!(f
->f_mode
& FMODE_WRITE
)) {
7060 pr_warn("%s: error: bitmap file must open for write\n",
7063 } else if (atomic_read(&inode
->i_writecount
) != 1) {
7064 pr_warn("%s: error: bitmap file is already in use\n",
7072 mddev
->bitmap_info
.file
= f
;
7073 mddev
->bitmap_info
.offset
= 0; /* file overrides offset */
7074 } else if (mddev
->bitmap
== NULL
)
7075 return -ENOENT
; /* cannot remove what isn't there */
7079 struct bitmap
*bitmap
;
7081 bitmap
= md_bitmap_create(mddev
, -1);
7082 mddev_suspend(mddev
);
7083 if (!IS_ERR(bitmap
)) {
7084 mddev
->bitmap
= bitmap
;
7085 err
= md_bitmap_load(mddev
);
7087 err
= PTR_ERR(bitmap
);
7089 md_bitmap_destroy(mddev
);
7092 mddev_resume(mddev
);
7093 } else if (fd
< 0) {
7094 mddev_suspend(mddev
);
7095 md_bitmap_destroy(mddev
);
7096 mddev_resume(mddev
);
7100 struct file
*f
= mddev
->bitmap_info
.file
;
7102 spin_lock(&mddev
->lock
);
7103 mddev
->bitmap_info
.file
= NULL
;
7104 spin_unlock(&mddev
->lock
);
7113 * md_set_array_info is used two different ways
7114 * The original usage is when creating a new array.
7115 * In this usage, raid_disks is > 0 and it together with
7116 * level, size, not_persistent,layout,chunksize determine the
7117 * shape of the array.
7118 * This will always create an array with a type-0.90.0 superblock.
7119 * The newer usage is when assembling an array.
7120 * In this case raid_disks will be 0, and the major_version field is
7121 * use to determine which style super-blocks are to be found on the devices.
7122 * The minor and patch _version numbers are also kept incase the
7123 * super_block handler wishes to interpret them.
7125 int md_set_array_info(struct mddev
*mddev
, struct mdu_array_info_s
*info
)
7127 if (info
->raid_disks
== 0) {
7128 /* just setting version number for superblock loading */
7129 if (info
->major_version
< 0 ||
7130 info
->major_version
>= ARRAY_SIZE(super_types
) ||
7131 super_types
[info
->major_version
].name
== NULL
) {
7132 /* maybe try to auto-load a module? */
7133 pr_warn("md: superblock version %d not known\n",
7134 info
->major_version
);
7137 mddev
->major_version
= info
->major_version
;
7138 mddev
->minor_version
= info
->minor_version
;
7139 mddev
->patch_version
= info
->patch_version
;
7140 mddev
->persistent
= !info
->not_persistent
;
7141 /* ensure mddev_put doesn't delete this now that there
7142 * is some minimal configuration.
7144 mddev
->ctime
= ktime_get_real_seconds();
7147 mddev
->major_version
= MD_MAJOR_VERSION
;
7148 mddev
->minor_version
= MD_MINOR_VERSION
;
7149 mddev
->patch_version
= MD_PATCHLEVEL_VERSION
;
7150 mddev
->ctime
= ktime_get_real_seconds();
7152 mddev
->level
= info
->level
;
7153 mddev
->clevel
[0] = 0;
7154 mddev
->dev_sectors
= 2 * (sector_t
)info
->size
;
7155 mddev
->raid_disks
= info
->raid_disks
;
7156 /* don't set md_minor, it is determined by which /dev/md* was
7159 if (info
->state
& (1<<MD_SB_CLEAN
))
7160 mddev
->recovery_cp
= MaxSector
;
7162 mddev
->recovery_cp
= 0;
7163 mddev
->persistent
= ! info
->not_persistent
;
7164 mddev
->external
= 0;
7166 mddev
->layout
= info
->layout
;
7167 if (mddev
->level
== 0)
7168 /* Cannot trust RAID0 layout info here */
7170 mddev
->chunk_sectors
= info
->chunk_size
>> 9;
7172 if (mddev
->persistent
) {
7173 mddev
->max_disks
= MD_SB_DISKS
;
7175 mddev
->sb_flags
= 0;
7177 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
7179 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
7180 mddev
->bitmap_info
.default_space
= 64*2 - (MD_SB_BYTES
>> 9);
7181 mddev
->bitmap_info
.offset
= 0;
7183 mddev
->reshape_position
= MaxSector
;
7186 * Generate a 128 bit UUID
7188 get_random_bytes(mddev
->uuid
, 16);
7190 mddev
->new_level
= mddev
->level
;
7191 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
7192 mddev
->new_layout
= mddev
->layout
;
7193 mddev
->delta_disks
= 0;
7194 mddev
->reshape_backwards
= 0;
7199 void md_set_array_sectors(struct mddev
*mddev
, sector_t array_sectors
)
7201 lockdep_assert_held(&mddev
->reconfig_mutex
);
7203 if (mddev
->external_size
)
7206 mddev
->array_sectors
= array_sectors
;
7208 EXPORT_SYMBOL(md_set_array_sectors
);
7210 static int update_size(struct mddev
*mddev
, sector_t num_sectors
)
7212 struct md_rdev
*rdev
;
7214 int fit
= (num_sectors
== 0);
7215 sector_t old_dev_sectors
= mddev
->dev_sectors
;
7217 if (mddev
->pers
->resize
== NULL
)
7219 /* The "num_sectors" is the number of sectors of each device that
7220 * is used. This can only make sense for arrays with redundancy.
7221 * linear and raid0 always use whatever space is available. We can only
7222 * consider changing this number if no resync or reconstruction is
7223 * happening, and if the new size is acceptable. It must fit before the
7224 * sb_start or, if that is <data_offset, it must fit before the size
7225 * of each device. If num_sectors is zero, we find the largest size
7228 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
7234 rdev_for_each(rdev
, mddev
) {
7235 sector_t avail
= rdev
->sectors
;
7237 if (fit
&& (num_sectors
== 0 || num_sectors
> avail
))
7238 num_sectors
= avail
;
7239 if (avail
< num_sectors
)
7242 rv
= mddev
->pers
->resize(mddev
, num_sectors
);
7244 if (mddev_is_clustered(mddev
))
7245 md_cluster_ops
->update_size(mddev
, old_dev_sectors
);
7246 else if (mddev
->queue
) {
7247 set_capacity_and_notify(mddev
->gendisk
,
7248 mddev
->array_sectors
);
7254 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
)
7257 struct md_rdev
*rdev
;
7258 /* change the number of raid disks */
7259 if (mddev
->pers
->check_reshape
== NULL
)
7263 if (raid_disks
<= 0 ||
7264 (mddev
->max_disks
&& raid_disks
>= mddev
->max_disks
))
7266 if (mddev
->sync_thread
||
7267 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
7268 test_bit(MD_RESYNCING_REMOTE
, &mddev
->recovery
) ||
7269 mddev
->reshape_position
!= MaxSector
)
7272 rdev_for_each(rdev
, mddev
) {
7273 if (mddev
->raid_disks
< raid_disks
&&
7274 rdev
->data_offset
< rdev
->new_data_offset
)
7276 if (mddev
->raid_disks
> raid_disks
&&
7277 rdev
->data_offset
> rdev
->new_data_offset
)
7281 mddev
->delta_disks
= raid_disks
- mddev
->raid_disks
;
7282 if (mddev
->delta_disks
< 0)
7283 mddev
->reshape_backwards
= 1;
7284 else if (mddev
->delta_disks
> 0)
7285 mddev
->reshape_backwards
= 0;
7287 rv
= mddev
->pers
->check_reshape(mddev
);
7289 mddev
->delta_disks
= 0;
7290 mddev
->reshape_backwards
= 0;
7296 * update_array_info is used to change the configuration of an
7298 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
7299 * fields in the info are checked against the array.
7300 * Any differences that cannot be handled will cause an error.
7301 * Normally, only one change can be managed at a time.
7303 static int update_array_info(struct mddev
*mddev
, mdu_array_info_t
*info
)
7309 /* calculate expected state,ignoring low bits */
7310 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
7311 state
|= (1 << MD_SB_BITMAP_PRESENT
);
7313 if (mddev
->major_version
!= info
->major_version
||
7314 mddev
->minor_version
!= info
->minor_version
||
7315 /* mddev->patch_version != info->patch_version || */
7316 mddev
->ctime
!= info
->ctime
||
7317 mddev
->level
!= info
->level
||
7318 /* mddev->layout != info->layout || */
7319 mddev
->persistent
!= !info
->not_persistent
||
7320 mddev
->chunk_sectors
!= info
->chunk_size
>> 9 ||
7321 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
7322 ((state
^info
->state
) & 0xfffffe00)
7325 /* Check there is only one change */
7326 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
7328 if (mddev
->raid_disks
!= info
->raid_disks
)
7330 if (mddev
->layout
!= info
->layout
)
7332 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
))
7339 if (mddev
->layout
!= info
->layout
) {
7341 * we don't need to do anything at the md level, the
7342 * personality will take care of it all.
7344 if (mddev
->pers
->check_reshape
== NULL
)
7347 mddev
->new_layout
= info
->layout
;
7348 rv
= mddev
->pers
->check_reshape(mddev
);
7350 mddev
->new_layout
= mddev
->layout
;
7354 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
7355 rv
= update_size(mddev
, (sector_t
)info
->size
* 2);
7357 if (mddev
->raid_disks
!= info
->raid_disks
)
7358 rv
= update_raid_disks(mddev
, info
->raid_disks
);
7360 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) {
7361 if (mddev
->pers
->quiesce
== NULL
|| mddev
->thread
== NULL
) {
7365 if (mddev
->recovery
|| mddev
->sync_thread
) {
7369 if (info
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
7370 struct bitmap
*bitmap
;
7371 /* add the bitmap */
7372 if (mddev
->bitmap
) {
7376 if (mddev
->bitmap_info
.default_offset
== 0) {
7380 mddev
->bitmap_info
.offset
=
7381 mddev
->bitmap_info
.default_offset
;
7382 mddev
->bitmap_info
.space
=
7383 mddev
->bitmap_info
.default_space
;
7384 bitmap
= md_bitmap_create(mddev
, -1);
7385 mddev_suspend(mddev
);
7386 if (!IS_ERR(bitmap
)) {
7387 mddev
->bitmap
= bitmap
;
7388 rv
= md_bitmap_load(mddev
);
7390 rv
= PTR_ERR(bitmap
);
7392 md_bitmap_destroy(mddev
);
7393 mddev_resume(mddev
);
7395 /* remove the bitmap */
7396 if (!mddev
->bitmap
) {
7400 if (mddev
->bitmap
->storage
.file
) {
7404 if (mddev
->bitmap_info
.nodes
) {
7405 /* hold PW on all the bitmap lock */
7406 if (md_cluster_ops
->lock_all_bitmaps(mddev
) <= 0) {
7407 pr_warn("md: can't change bitmap to none since the array is in use by more than one node\n");
7409 md_cluster_ops
->unlock_all_bitmaps(mddev
);
7413 mddev
->bitmap_info
.nodes
= 0;
7414 md_cluster_ops
->leave(mddev
);
7415 module_put(md_cluster_mod
);
7416 mddev
->safemode_delay
= DEFAULT_SAFEMODE_DELAY
;
7418 mddev_suspend(mddev
);
7419 md_bitmap_destroy(mddev
);
7420 mddev_resume(mddev
);
7421 mddev
->bitmap_info
.offset
= 0;
7424 md_update_sb(mddev
, 1);
7430 static int set_disk_faulty(struct mddev
*mddev
, dev_t dev
)
7432 struct md_rdev
*rdev
;
7435 if (mddev
->pers
== NULL
)
7439 rdev
= md_find_rdev_rcu(mddev
, dev
);
7443 md_error(mddev
, rdev
);
7444 if (test_bit(MD_BROKEN
, &mddev
->flags
))
7452 * We have a problem here : there is no easy way to give a CHS
7453 * virtual geometry. We currently pretend that we have a 2 heads
7454 * 4 sectors (with a BIG number of cylinders...). This drives
7455 * dosfs just mad... ;-)
7457 static int md_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
7459 struct mddev
*mddev
= bdev
->bd_disk
->private_data
;
7463 geo
->cylinders
= mddev
->array_sectors
/ 8;
7467 static inline bool md_ioctl_valid(unsigned int cmd
)
7471 case GET_ARRAY_INFO
:
7472 case GET_BITMAP_FILE
:
7475 case HOT_REMOVE_DISK
:
7477 case RESTART_ARRAY_RW
:
7479 case SET_ARRAY_INFO
:
7480 case SET_BITMAP_FILE
:
7481 case SET_DISK_FAULTY
:
7484 case CLUSTERED_DISK_NACK
:
7491 static int md_ioctl(struct block_device
*bdev
, fmode_t mode
,
7492 unsigned int cmd
, unsigned long arg
)
7495 void __user
*argp
= (void __user
*)arg
;
7496 struct mddev
*mddev
= NULL
;
7497 bool did_set_md_closing
= false;
7499 if (!md_ioctl_valid(cmd
))
7504 case GET_ARRAY_INFO
:
7508 if (!capable(CAP_SYS_ADMIN
))
7513 * Commands dealing with the RAID driver but not any
7518 err
= get_version(argp
);
7524 * Commands creating/starting a new array:
7527 mddev
= bdev
->bd_disk
->private_data
;
7534 /* Some actions do not requires the mutex */
7536 case GET_ARRAY_INFO
:
7537 if (!mddev
->raid_disks
&& !mddev
->external
)
7540 err
= get_array_info(mddev
, argp
);
7544 if (!mddev
->raid_disks
&& !mddev
->external
)
7547 err
= get_disk_info(mddev
, argp
);
7550 case SET_DISK_FAULTY
:
7551 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
7554 case GET_BITMAP_FILE
:
7555 err
= get_bitmap_file(mddev
, argp
);
7560 if (cmd
== ADD_NEW_DISK
|| cmd
== HOT_ADD_DISK
)
7561 flush_rdev_wq(mddev
);
7563 if (cmd
== HOT_REMOVE_DISK
)
7564 /* need to ensure recovery thread has run */
7565 wait_event_interruptible_timeout(mddev
->sb_wait
,
7566 !test_bit(MD_RECOVERY_NEEDED
,
7568 msecs_to_jiffies(5000));
7569 if (cmd
== STOP_ARRAY
|| cmd
== STOP_ARRAY_RO
) {
7570 /* Need to flush page cache, and ensure no-one else opens
7573 mutex_lock(&mddev
->open_mutex
);
7574 if (mddev
->pers
&& atomic_read(&mddev
->openers
) > 1) {
7575 mutex_unlock(&mddev
->open_mutex
);
7579 if (test_and_set_bit(MD_CLOSING
, &mddev
->flags
)) {
7580 mutex_unlock(&mddev
->open_mutex
);
7584 did_set_md_closing
= true;
7585 mutex_unlock(&mddev
->open_mutex
);
7586 sync_blockdev(bdev
);
7588 err
= mddev_lock(mddev
);
7590 pr_debug("md: ioctl lock interrupted, reason %d, cmd %d\n",
7595 if (cmd
== SET_ARRAY_INFO
) {
7596 mdu_array_info_t info
;
7598 memset(&info
, 0, sizeof(info
));
7599 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
7604 err
= update_array_info(mddev
, &info
);
7606 pr_warn("md: couldn't update array info. %d\n", err
);
7611 if (!list_empty(&mddev
->disks
)) {
7612 pr_warn("md: array %s already has disks!\n", mdname(mddev
));
7616 if (mddev
->raid_disks
) {
7617 pr_warn("md: array %s already initialised!\n", mdname(mddev
));
7621 err
= md_set_array_info(mddev
, &info
);
7623 pr_warn("md: couldn't set array info. %d\n", err
);
7630 * Commands querying/configuring an existing array:
7632 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
7633 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
7634 if ((!mddev
->raid_disks
&& !mddev
->external
)
7635 && cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
7636 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
7637 && cmd
!= GET_BITMAP_FILE
) {
7643 * Commands even a read-only array can execute:
7646 case RESTART_ARRAY_RW
:
7647 err
= restart_array(mddev
);
7651 err
= do_md_stop(mddev
, 0, bdev
);
7655 err
= md_set_readonly(mddev
, bdev
);
7658 case HOT_REMOVE_DISK
:
7659 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
7663 /* We can support ADD_NEW_DISK on read-only arrays
7664 * only if we are re-adding a preexisting device.
7665 * So require mddev->pers and MD_DISK_SYNC.
7668 mdu_disk_info_t info
;
7669 if (copy_from_user(&info
, argp
, sizeof(info
)))
7671 else if (!(info
.state
& (1<<MD_DISK_SYNC
)))
7672 /* Need to clear read-only for this */
7675 err
= md_add_new_disk(mddev
, &info
);
7682 * The remaining ioctls are changing the state of the
7683 * superblock, so we do not allow them on read-only arrays.
7685 if (mddev
->ro
&& mddev
->pers
) {
7686 if (mddev
->ro
== 2) {
7688 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7689 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7690 /* mddev_unlock will wake thread */
7691 /* If a device failed while we were read-only, we
7692 * need to make sure the metadata is updated now.
7694 if (test_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
)) {
7695 mddev_unlock(mddev
);
7696 wait_event(mddev
->sb_wait
,
7697 !test_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
) &&
7698 !test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
));
7699 mddev_lock_nointr(mddev
);
7710 mdu_disk_info_t info
;
7711 if (copy_from_user(&info
, argp
, sizeof(info
)))
7714 err
= md_add_new_disk(mddev
, &info
);
7718 case CLUSTERED_DISK_NACK
:
7719 if (mddev_is_clustered(mddev
))
7720 md_cluster_ops
->new_disk_ack(mddev
, false);
7726 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
7730 err
= do_md_run(mddev
);
7733 case SET_BITMAP_FILE
:
7734 err
= set_bitmap_file(mddev
, (int)arg
);
7743 if (mddev
->hold_active
== UNTIL_IOCTL
&&
7745 mddev
->hold_active
= 0;
7746 mddev_unlock(mddev
);
7748 if(did_set_md_closing
)
7749 clear_bit(MD_CLOSING
, &mddev
->flags
);
7752 #ifdef CONFIG_COMPAT
7753 static int md_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
7754 unsigned int cmd
, unsigned long arg
)
7757 case HOT_REMOVE_DISK
:
7759 case SET_DISK_FAULTY
:
7760 case SET_BITMAP_FILE
:
7761 /* These take in integer arg, do not convert */
7764 arg
= (unsigned long)compat_ptr(arg
);
7768 return md_ioctl(bdev
, mode
, cmd
, arg
);
7770 #endif /* CONFIG_COMPAT */
7772 static int md_set_read_only(struct block_device
*bdev
, bool ro
)
7774 struct mddev
*mddev
= bdev
->bd_disk
->private_data
;
7777 err
= mddev_lock(mddev
);
7781 if (!mddev
->raid_disks
&& !mddev
->external
) {
7787 * Transitioning to read-auto need only happen for arrays that call
7788 * md_write_start and which are not ready for writes yet.
7790 if (!ro
&& mddev
->ro
== 1 && mddev
->pers
) {
7791 err
= restart_array(mddev
);
7798 mddev_unlock(mddev
);
7802 static int md_open(struct block_device
*bdev
, fmode_t mode
)
7805 * Succeed if we can lock the mddev, which confirms that
7806 * it isn't being stopped right now.
7808 struct mddev
*mddev
= mddev_find(bdev
->bd_dev
);
7814 if (mddev
->gendisk
!= bdev
->bd_disk
) {
7815 /* we are racing with mddev_put which is discarding this
7819 /* Wait until bdev->bd_disk is definitely gone */
7820 if (work_pending(&mddev
->del_work
))
7821 flush_workqueue(md_misc_wq
);
7824 BUG_ON(mddev
!= bdev
->bd_disk
->private_data
);
7826 if ((err
= mutex_lock_interruptible(&mddev
->open_mutex
)))
7829 if (test_bit(MD_CLOSING
, &mddev
->flags
)) {
7830 mutex_unlock(&mddev
->open_mutex
);
7836 atomic_inc(&mddev
->openers
);
7837 mutex_unlock(&mddev
->open_mutex
);
7839 bdev_check_media_change(bdev
);
7846 static void md_release(struct gendisk
*disk
, fmode_t mode
)
7848 struct mddev
*mddev
= disk
->private_data
;
7851 atomic_dec(&mddev
->openers
);
7855 static unsigned int md_check_events(struct gendisk
*disk
, unsigned int clearing
)
7857 struct mddev
*mddev
= disk
->private_data
;
7858 unsigned int ret
= 0;
7861 ret
= DISK_EVENT_MEDIA_CHANGE
;
7866 static void md_free_disk(struct gendisk
*disk
)
7868 struct mddev
*mddev
= disk
->private_data
;
7870 percpu_ref_exit(&mddev
->writes_pending
);
7871 bioset_exit(&mddev
->bio_set
);
7872 bioset_exit(&mddev
->sync_set
);
7877 const struct block_device_operations md_fops
=
7879 .owner
= THIS_MODULE
,
7880 .submit_bio
= md_submit_bio
,
7882 .release
= md_release
,
7884 #ifdef CONFIG_COMPAT
7885 .compat_ioctl
= md_compat_ioctl
,
7887 .getgeo
= md_getgeo
,
7888 .check_events
= md_check_events
,
7889 .set_read_only
= md_set_read_only
,
7890 .free_disk
= md_free_disk
,
7893 static int md_thread(void *arg
)
7895 struct md_thread
*thread
= arg
;
7898 * md_thread is a 'system-thread', it's priority should be very
7899 * high. We avoid resource deadlocks individually in each
7900 * raid personality. (RAID5 does preallocation) We also use RR and
7901 * the very same RT priority as kswapd, thus we will never get
7902 * into a priority inversion deadlock.
7904 * we definitely have to have equal or higher priority than
7905 * bdflush, otherwise bdflush will deadlock if there are too
7906 * many dirty RAID5 blocks.
7909 allow_signal(SIGKILL
);
7910 while (!kthread_should_stop()) {
7912 /* We need to wait INTERRUPTIBLE so that
7913 * we don't add to the load-average.
7914 * That means we need to be sure no signals are
7917 if (signal_pending(current
))
7918 flush_signals(current
);
7920 wait_event_interruptible_timeout
7922 test_bit(THREAD_WAKEUP
, &thread
->flags
)
7923 || kthread_should_stop() || kthread_should_park(),
7926 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
7927 if (kthread_should_park())
7929 if (!kthread_should_stop())
7930 thread
->run(thread
);
7936 void md_wakeup_thread(struct md_thread
*thread
)
7939 pr_debug("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
7940 set_bit(THREAD_WAKEUP
, &thread
->flags
);
7941 wake_up(&thread
->wqueue
);
7944 EXPORT_SYMBOL(md_wakeup_thread
);
7946 struct md_thread
*md_register_thread(void (*run
) (struct md_thread
*),
7947 struct mddev
*mddev
, const char *name
)
7949 struct md_thread
*thread
;
7951 thread
= kzalloc(sizeof(struct md_thread
), GFP_KERNEL
);
7955 init_waitqueue_head(&thread
->wqueue
);
7958 thread
->mddev
= mddev
;
7959 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
7960 thread
->tsk
= kthread_run(md_thread
, thread
,
7962 mdname(thread
->mddev
),
7964 if (IS_ERR(thread
->tsk
)) {
7970 EXPORT_SYMBOL(md_register_thread
);
7972 void md_unregister_thread(struct md_thread
**threadp
)
7974 struct md_thread
*thread
;
7977 * Locking ensures that mddev_unlock does not wake_up a
7978 * non-existent thread
7980 spin_lock(&pers_lock
);
7983 spin_unlock(&pers_lock
);
7987 spin_unlock(&pers_lock
);
7989 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread
->tsk
));
7990 kthread_stop(thread
->tsk
);
7993 EXPORT_SYMBOL(md_unregister_thread
);
7995 void md_error(struct mddev
*mddev
, struct md_rdev
*rdev
)
7997 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
8000 if (!mddev
->pers
|| !mddev
->pers
->error_handler
)
8002 mddev
->pers
->error_handler(mddev
, rdev
);
8004 if (mddev
->degraded
&& !test_bit(MD_BROKEN
, &mddev
->flags
))
8005 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8006 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
8007 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8008 if (!test_bit(MD_BROKEN
, &mddev
->flags
)) {
8009 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
8010 md_wakeup_thread(mddev
->thread
);
8012 if (mddev
->event_work
.func
)
8013 queue_work(md_misc_wq
, &mddev
->event_work
);
8016 EXPORT_SYMBOL(md_error
);
8018 /* seq_file implementation /proc/mdstat */
8020 static void status_unused(struct seq_file
*seq
)
8023 struct md_rdev
*rdev
;
8025 seq_printf(seq
, "unused devices: ");
8027 list_for_each_entry(rdev
, &pending_raid_disks
, same_set
) {
8029 seq_printf(seq
, "%pg ", rdev
->bdev
);
8032 seq_printf(seq
, "<none>");
8034 seq_printf(seq
, "\n");
8037 static int status_resync(struct seq_file
*seq
, struct mddev
*mddev
)
8039 sector_t max_sectors
, resync
, res
;
8040 unsigned long dt
, db
= 0;
8041 sector_t rt
, curr_mark_cnt
, resync_mark_cnt
;
8042 int scale
, recovery_active
;
8043 unsigned int per_milli
;
8045 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
8046 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
8047 max_sectors
= mddev
->resync_max_sectors
;
8049 max_sectors
= mddev
->dev_sectors
;
8051 resync
= mddev
->curr_resync
;
8052 if (resync
< MD_RESYNC_ACTIVE
) {
8053 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
8054 /* Still cleaning up */
8055 resync
= max_sectors
;
8056 } else if (resync
> max_sectors
) {
8057 resync
= max_sectors
;
8059 resync
-= atomic_read(&mddev
->recovery_active
);
8060 if (resync
< MD_RESYNC_ACTIVE
) {
8062 * Resync has started, but the subtraction has
8063 * yielded one of the special values. Force it
8064 * to active to ensure the status reports an
8067 resync
= MD_RESYNC_ACTIVE
;
8071 if (resync
== MD_RESYNC_NONE
) {
8072 if (test_bit(MD_RESYNCING_REMOTE
, &mddev
->recovery
)) {
8073 struct md_rdev
*rdev
;
8075 rdev_for_each(rdev
, mddev
)
8076 if (rdev
->raid_disk
>= 0 &&
8077 !test_bit(Faulty
, &rdev
->flags
) &&
8078 rdev
->recovery_offset
!= MaxSector
&&
8079 rdev
->recovery_offset
) {
8080 seq_printf(seq
, "\trecover=REMOTE");
8083 if (mddev
->reshape_position
!= MaxSector
)
8084 seq_printf(seq
, "\treshape=REMOTE");
8086 seq_printf(seq
, "\tresync=REMOTE");
8089 if (mddev
->recovery_cp
< MaxSector
) {
8090 seq_printf(seq
, "\tresync=PENDING");
8095 if (resync
< MD_RESYNC_ACTIVE
) {
8096 seq_printf(seq
, "\tresync=DELAYED");
8100 WARN_ON(max_sectors
== 0);
8101 /* Pick 'scale' such that (resync>>scale)*1000 will fit
8102 * in a sector_t, and (max_sectors>>scale) will fit in a
8103 * u32, as those are the requirements for sector_div.
8104 * Thus 'scale' must be at least 10
8107 if (sizeof(sector_t
) > sizeof(unsigned long)) {
8108 while ( max_sectors
/2 > (1ULL<<(scale
+32)))
8111 res
= (resync
>>scale
)*1000;
8112 sector_div(res
, (u32
)((max_sectors
>>scale
)+1));
8116 int i
, x
= per_milli
/50, y
= 20-x
;
8117 seq_printf(seq
, "[");
8118 for (i
= 0; i
< x
; i
++)
8119 seq_printf(seq
, "=");
8120 seq_printf(seq
, ">");
8121 for (i
= 0; i
< y
; i
++)
8122 seq_printf(seq
, ".");
8123 seq_printf(seq
, "] ");
8125 seq_printf(seq
, " %s =%3u.%u%% (%llu/%llu)",
8126 (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)?
8128 (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)?
8130 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
8131 "resync" : "recovery"))),
8132 per_milli
/10, per_milli
% 10,
8133 (unsigned long long) resync
/2,
8134 (unsigned long long) max_sectors
/2);
8137 * dt: time from mark until now
8138 * db: blocks written from mark until now
8139 * rt: remaining time
8141 * rt is a sector_t, which is always 64bit now. We are keeping
8142 * the original algorithm, but it is not really necessary.
8144 * Original algorithm:
8145 * So we divide before multiply in case it is 32bit and close
8147 * We scale the divisor (db) by 32 to avoid losing precision
8148 * near the end of resync when the number of remaining sectors
8150 * We then divide rt by 32 after multiplying by db to compensate.
8151 * The '+1' avoids division by zero if db is very small.
8153 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
8156 curr_mark_cnt
= mddev
->curr_mark_cnt
;
8157 recovery_active
= atomic_read(&mddev
->recovery_active
);
8158 resync_mark_cnt
= mddev
->resync_mark_cnt
;
8160 if (curr_mark_cnt
>= (recovery_active
+ resync_mark_cnt
))
8161 db
= curr_mark_cnt
- (recovery_active
+ resync_mark_cnt
);
8163 rt
= max_sectors
- resync
; /* number of remaining sectors */
8164 rt
= div64_u64(rt
, db
/32+1);
8168 seq_printf(seq
, " finish=%lu.%lumin", (unsigned long)rt
/ 60,
8169 ((unsigned long)rt
% 60)/6);
8171 seq_printf(seq
, " speed=%ldK/sec", db
/2/dt
);
8175 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
8177 struct list_head
*tmp
;
8179 struct mddev
*mddev
;
8191 spin_lock(&all_mddevs_lock
);
8192 list_for_each(tmp
,&all_mddevs
)
8194 mddev
= list_entry(tmp
, struct mddev
, all_mddevs
);
8196 spin_unlock(&all_mddevs_lock
);
8199 spin_unlock(&all_mddevs_lock
);
8201 return (void*)2;/* tail */
8205 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
8207 struct list_head
*tmp
;
8208 struct mddev
*next_mddev
, *mddev
= v
;
8214 spin_lock(&all_mddevs_lock
);
8216 tmp
= all_mddevs
.next
;
8218 tmp
= mddev
->all_mddevs
.next
;
8219 if (tmp
!= &all_mddevs
)
8220 next_mddev
= mddev_get(list_entry(tmp
,struct mddev
,all_mddevs
));
8222 next_mddev
= (void*)2;
8225 spin_unlock(&all_mddevs_lock
);
8233 static void md_seq_stop(struct seq_file
*seq
, void *v
)
8235 struct mddev
*mddev
= v
;
8237 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
8241 static int md_seq_show(struct seq_file
*seq
, void *v
)
8243 struct mddev
*mddev
= v
;
8245 struct md_rdev
*rdev
;
8247 if (v
== (void*)1) {
8248 struct md_personality
*pers
;
8249 seq_printf(seq
, "Personalities : ");
8250 spin_lock(&pers_lock
);
8251 list_for_each_entry(pers
, &pers_list
, list
)
8252 seq_printf(seq
, "[%s] ", pers
->name
);
8254 spin_unlock(&pers_lock
);
8255 seq_printf(seq
, "\n");
8256 seq
->poll_event
= atomic_read(&md_event_count
);
8259 if (v
== (void*)2) {
8264 spin_lock(&mddev
->lock
);
8265 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
8266 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
8267 mddev
->pers
? "" : "in");
8270 seq_printf(seq
, " (read-only)");
8272 seq_printf(seq
, " (auto-read-only)");
8273 seq_printf(seq
, " %s", mddev
->pers
->name
);
8278 rdev_for_each_rcu(rdev
, mddev
) {
8279 seq_printf(seq
, " %pg[%d]", rdev
->bdev
, rdev
->desc_nr
);
8281 if (test_bit(WriteMostly
, &rdev
->flags
))
8282 seq_printf(seq
, "(W)");
8283 if (test_bit(Journal
, &rdev
->flags
))
8284 seq_printf(seq
, "(J)");
8285 if (test_bit(Faulty
, &rdev
->flags
)) {
8286 seq_printf(seq
, "(F)");
8289 if (rdev
->raid_disk
< 0)
8290 seq_printf(seq
, "(S)"); /* spare */
8291 if (test_bit(Replacement
, &rdev
->flags
))
8292 seq_printf(seq
, "(R)");
8293 sectors
+= rdev
->sectors
;
8297 if (!list_empty(&mddev
->disks
)) {
8299 seq_printf(seq
, "\n %llu blocks",
8300 (unsigned long long)
8301 mddev
->array_sectors
/ 2);
8303 seq_printf(seq
, "\n %llu blocks",
8304 (unsigned long long)sectors
/ 2);
8306 if (mddev
->persistent
) {
8307 if (mddev
->major_version
!= 0 ||
8308 mddev
->minor_version
!= 90) {
8309 seq_printf(seq
," super %d.%d",
8310 mddev
->major_version
,
8311 mddev
->minor_version
);
8313 } else if (mddev
->external
)
8314 seq_printf(seq
, " super external:%s",
8315 mddev
->metadata_type
);
8317 seq_printf(seq
, " super non-persistent");
8320 mddev
->pers
->status(seq
, mddev
);
8321 seq_printf(seq
, "\n ");
8322 if (mddev
->pers
->sync_request
) {
8323 if (status_resync(seq
, mddev
))
8324 seq_printf(seq
, "\n ");
8327 seq_printf(seq
, "\n ");
8329 md_bitmap_status(seq
, mddev
->bitmap
);
8331 seq_printf(seq
, "\n");
8333 spin_unlock(&mddev
->lock
);
8338 static const struct seq_operations md_seq_ops
= {
8339 .start
= md_seq_start
,
8340 .next
= md_seq_next
,
8341 .stop
= md_seq_stop
,
8342 .show
= md_seq_show
,
8345 static int md_seq_open(struct inode
*inode
, struct file
*file
)
8347 struct seq_file
*seq
;
8350 error
= seq_open(file
, &md_seq_ops
);
8354 seq
= file
->private_data
;
8355 seq
->poll_event
= atomic_read(&md_event_count
);
8359 static int md_unloading
;
8360 static __poll_t
mdstat_poll(struct file
*filp
, poll_table
*wait
)
8362 struct seq_file
*seq
= filp
->private_data
;
8366 return EPOLLIN
|EPOLLRDNORM
|EPOLLERR
|EPOLLPRI
;
8367 poll_wait(filp
, &md_event_waiters
, wait
);
8369 /* always allow read */
8370 mask
= EPOLLIN
| EPOLLRDNORM
;
8372 if (seq
->poll_event
!= atomic_read(&md_event_count
))
8373 mask
|= EPOLLERR
| EPOLLPRI
;
8377 static const struct proc_ops mdstat_proc_ops
= {
8378 .proc_open
= md_seq_open
,
8379 .proc_read
= seq_read
,
8380 .proc_lseek
= seq_lseek
,
8381 .proc_release
= seq_release
,
8382 .proc_poll
= mdstat_poll
,
8385 int register_md_personality(struct md_personality
*p
)
8387 pr_debug("md: %s personality registered for level %d\n",
8389 spin_lock(&pers_lock
);
8390 list_add_tail(&p
->list
, &pers_list
);
8391 spin_unlock(&pers_lock
);
8394 EXPORT_SYMBOL(register_md_personality
);
8396 int unregister_md_personality(struct md_personality
*p
)
8398 pr_debug("md: %s personality unregistered\n", p
->name
);
8399 spin_lock(&pers_lock
);
8400 list_del_init(&p
->list
);
8401 spin_unlock(&pers_lock
);
8404 EXPORT_SYMBOL(unregister_md_personality
);
8406 int register_md_cluster_operations(struct md_cluster_operations
*ops
,
8407 struct module
*module
)
8410 spin_lock(&pers_lock
);
8411 if (md_cluster_ops
!= NULL
)
8414 md_cluster_ops
= ops
;
8415 md_cluster_mod
= module
;
8417 spin_unlock(&pers_lock
);
8420 EXPORT_SYMBOL(register_md_cluster_operations
);
8422 int unregister_md_cluster_operations(void)
8424 spin_lock(&pers_lock
);
8425 md_cluster_ops
= NULL
;
8426 spin_unlock(&pers_lock
);
8429 EXPORT_SYMBOL(unregister_md_cluster_operations
);
8431 int md_setup_cluster(struct mddev
*mddev
, int nodes
)
8434 if (!md_cluster_ops
)
8435 request_module("md-cluster");
8436 spin_lock(&pers_lock
);
8437 /* ensure module won't be unloaded */
8438 if (!md_cluster_ops
|| !try_module_get(md_cluster_mod
)) {
8439 pr_warn("can't find md-cluster module or get its reference.\n");
8440 spin_unlock(&pers_lock
);
8443 spin_unlock(&pers_lock
);
8445 ret
= md_cluster_ops
->join(mddev
, nodes
);
8447 mddev
->safemode_delay
= 0;
8451 void md_cluster_stop(struct mddev
*mddev
)
8453 if (!md_cluster_ops
)
8455 md_cluster_ops
->leave(mddev
);
8456 module_put(md_cluster_mod
);
8459 static int is_mddev_idle(struct mddev
*mddev
, int init
)
8461 struct md_rdev
*rdev
;
8467 rdev_for_each_rcu(rdev
, mddev
) {
8468 struct gendisk
*disk
= rdev
->bdev
->bd_disk
;
8469 curr_events
= (int)part_stat_read_accum(disk
->part0
, sectors
) -
8470 atomic_read(&disk
->sync_io
);
8471 /* sync IO will cause sync_io to increase before the disk_stats
8472 * as sync_io is counted when a request starts, and
8473 * disk_stats is counted when it completes.
8474 * So resync activity will cause curr_events to be smaller than
8475 * when there was no such activity.
8476 * non-sync IO will cause disk_stat to increase without
8477 * increasing sync_io so curr_events will (eventually)
8478 * be larger than it was before. Once it becomes
8479 * substantially larger, the test below will cause
8480 * the array to appear non-idle, and resync will slow
8482 * If there is a lot of outstanding resync activity when
8483 * we set last_event to curr_events, then all that activity
8484 * completing might cause the array to appear non-idle
8485 * and resync will be slowed down even though there might
8486 * not have been non-resync activity. This will only
8487 * happen once though. 'last_events' will soon reflect
8488 * the state where there is little or no outstanding
8489 * resync requests, and further resync activity will
8490 * always make curr_events less than last_events.
8493 if (init
|| curr_events
- rdev
->last_events
> 64) {
8494 rdev
->last_events
= curr_events
;
8502 void md_done_sync(struct mddev
*mddev
, int blocks
, int ok
)
8504 /* another "blocks" (512byte) blocks have been synced */
8505 atomic_sub(blocks
, &mddev
->recovery_active
);
8506 wake_up(&mddev
->recovery_wait
);
8508 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8509 set_bit(MD_RECOVERY_ERROR
, &mddev
->recovery
);
8510 md_wakeup_thread(mddev
->thread
);
8511 // stop recovery, signal do_sync ....
8514 EXPORT_SYMBOL(md_done_sync
);
8516 /* md_write_start(mddev, bi)
8517 * If we need to update some array metadata (e.g. 'active' flag
8518 * in superblock) before writing, schedule a superblock update
8519 * and wait for it to complete.
8520 * A return value of 'false' means that the write wasn't recorded
8521 * and cannot proceed as the array is being suspend.
8523 bool md_write_start(struct mddev
*mddev
, struct bio
*bi
)
8527 if (bio_data_dir(bi
) != WRITE
)
8530 BUG_ON(mddev
->ro
== 1);
8531 if (mddev
->ro
== 2) {
8532 /* need to switch to read/write */
8534 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
8535 md_wakeup_thread(mddev
->thread
);
8536 md_wakeup_thread(mddev
->sync_thread
);
8540 percpu_ref_get(&mddev
->writes_pending
);
8541 smp_mb(); /* Match smp_mb in set_in_sync() */
8542 if (mddev
->safemode
== 1)
8543 mddev
->safemode
= 0;
8544 /* sync_checkers is always 0 when writes_pending is in per-cpu mode */
8545 if (mddev
->in_sync
|| mddev
->sync_checkers
) {
8546 spin_lock(&mddev
->lock
);
8547 if (mddev
->in_sync
) {
8549 set_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
8550 set_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
8551 md_wakeup_thread(mddev
->thread
);
8554 spin_unlock(&mddev
->lock
);
8558 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
8559 if (!mddev
->has_superblocks
)
8561 wait_event(mddev
->sb_wait
,
8562 !test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
) ||
8564 if (test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
)) {
8565 percpu_ref_put(&mddev
->writes_pending
);
8570 EXPORT_SYMBOL(md_write_start
);
8572 /* md_write_inc can only be called when md_write_start() has
8573 * already been called at least once of the current request.
8574 * It increments the counter and is useful when a single request
8575 * is split into several parts. Each part causes an increment and
8576 * so needs a matching md_write_end().
8577 * Unlike md_write_start(), it is safe to call md_write_inc() inside
8578 * a spinlocked region.
8580 void md_write_inc(struct mddev
*mddev
, struct bio
*bi
)
8582 if (bio_data_dir(bi
) != WRITE
)
8584 WARN_ON_ONCE(mddev
->in_sync
|| mddev
->ro
);
8585 percpu_ref_get(&mddev
->writes_pending
);
8587 EXPORT_SYMBOL(md_write_inc
);
8589 void md_write_end(struct mddev
*mddev
)
8591 percpu_ref_put(&mddev
->writes_pending
);
8593 if (mddev
->safemode
== 2)
8594 md_wakeup_thread(mddev
->thread
);
8595 else if (mddev
->safemode_delay
)
8596 /* The roundup() ensures this only performs locking once
8597 * every ->safemode_delay jiffies
8599 mod_timer(&mddev
->safemode_timer
,
8600 roundup(jiffies
, mddev
->safemode_delay
) +
8601 mddev
->safemode_delay
);
8604 EXPORT_SYMBOL(md_write_end
);
8606 /* This is used by raid0 and raid10 */
8607 void md_submit_discard_bio(struct mddev
*mddev
, struct md_rdev
*rdev
,
8608 struct bio
*bio
, sector_t start
, sector_t size
)
8610 struct bio
*discard_bio
= NULL
;
8612 if (__blkdev_issue_discard(rdev
->bdev
, start
, size
, GFP_NOIO
,
8613 &discard_bio
) || !discard_bio
)
8616 bio_chain(discard_bio
, bio
);
8617 bio_clone_blkg_association(discard_bio
, bio
);
8619 trace_block_bio_remap(discard_bio
,
8620 disk_devt(mddev
->gendisk
),
8621 bio
->bi_iter
.bi_sector
);
8622 submit_bio_noacct(discard_bio
);
8624 EXPORT_SYMBOL_GPL(md_submit_discard_bio
);
8626 int acct_bioset_init(struct mddev
*mddev
)
8630 if (!bioset_initialized(&mddev
->io_acct_set
))
8631 err
= bioset_init(&mddev
->io_acct_set
, BIO_POOL_SIZE
,
8632 offsetof(struct md_io_acct
, bio_clone
), 0);
8635 EXPORT_SYMBOL_GPL(acct_bioset_init
);
8637 void acct_bioset_exit(struct mddev
*mddev
)
8639 bioset_exit(&mddev
->io_acct_set
);
8641 EXPORT_SYMBOL_GPL(acct_bioset_exit
);
8643 static void md_end_io_acct(struct bio
*bio
)
8645 struct md_io_acct
*md_io_acct
= bio
->bi_private
;
8646 struct bio
*orig_bio
= md_io_acct
->orig_bio
;
8648 orig_bio
->bi_status
= bio
->bi_status
;
8650 bio_end_io_acct(orig_bio
, md_io_acct
->start_time
);
8652 bio_endio(orig_bio
);
8656 * Used by personalities that don't already clone the bio and thus can't
8657 * easily add the timestamp to their extended bio structure.
8659 void md_account_bio(struct mddev
*mddev
, struct bio
**bio
)
8661 struct block_device
*bdev
= (*bio
)->bi_bdev
;
8662 struct md_io_acct
*md_io_acct
;
8665 if (!blk_queue_io_stat(bdev
->bd_disk
->queue
))
8668 clone
= bio_alloc_clone(bdev
, *bio
, GFP_NOIO
, &mddev
->io_acct_set
);
8669 md_io_acct
= container_of(clone
, struct md_io_acct
, bio_clone
);
8670 md_io_acct
->orig_bio
= *bio
;
8671 md_io_acct
->start_time
= bio_start_io_acct(*bio
);
8673 clone
->bi_end_io
= md_end_io_acct
;
8674 clone
->bi_private
= md_io_acct
;
8677 EXPORT_SYMBOL_GPL(md_account_bio
);
8679 /* md_allow_write(mddev)
8680 * Calling this ensures that the array is marked 'active' so that writes
8681 * may proceed without blocking. It is important to call this before
8682 * attempting a GFP_KERNEL allocation while holding the mddev lock.
8683 * Must be called with mddev_lock held.
8685 void md_allow_write(struct mddev
*mddev
)
8691 if (!mddev
->pers
->sync_request
)
8694 spin_lock(&mddev
->lock
);
8695 if (mddev
->in_sync
) {
8697 set_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
8698 set_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
8699 if (mddev
->safemode_delay
&&
8700 mddev
->safemode
== 0)
8701 mddev
->safemode
= 1;
8702 spin_unlock(&mddev
->lock
);
8703 md_update_sb(mddev
, 0);
8704 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
8705 /* wait for the dirty state to be recorded in the metadata */
8706 wait_event(mddev
->sb_wait
,
8707 !test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
));
8709 spin_unlock(&mddev
->lock
);
8711 EXPORT_SYMBOL_GPL(md_allow_write
);
8713 #define SYNC_MARKS 10
8714 #define SYNC_MARK_STEP (3*HZ)
8715 #define UPDATE_FREQUENCY (5*60*HZ)
8716 void md_do_sync(struct md_thread
*thread
)
8718 struct mddev
*mddev
= thread
->mddev
;
8719 struct mddev
*mddev2
;
8720 unsigned int currspeed
= 0, window
;
8721 sector_t max_sectors
,j
, io_sectors
, recovery_done
;
8722 unsigned long mark
[SYNC_MARKS
];
8723 unsigned long update_time
;
8724 sector_t mark_cnt
[SYNC_MARKS
];
8726 sector_t last_check
;
8728 struct md_rdev
*rdev
;
8729 char *desc
, *action
= NULL
;
8730 struct blk_plug plug
;
8733 /* just incase thread restarts... */
8734 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
8735 test_bit(MD_RECOVERY_WAIT
, &mddev
->recovery
))
8737 if (mddev
->ro
) {/* never try to sync a read-only array */
8738 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8742 if (mddev_is_clustered(mddev
)) {
8743 ret
= md_cluster_ops
->resync_start(mddev
);
8747 set_bit(MD_CLUSTER_RESYNC_LOCKED
, &mddev
->flags
);
8748 if (!(test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
8749 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) ||
8750 test_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
))
8751 && ((unsigned long long)mddev
->curr_resync_completed
8752 < (unsigned long long)mddev
->resync_max_sectors
))
8756 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
8757 if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)) {
8758 desc
= "data-check";
8760 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
8761 desc
= "requested-resync";
8765 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
8770 mddev
->last_sync_action
= action
?: desc
;
8773 * Before starting a resync we must have set curr_resync to
8774 * 2, and then checked that every "conflicting" array has curr_resync
8775 * less than ours. When we find one that is the same or higher
8776 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
8777 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
8778 * This will mean we have to start checking from the beginning again.
8783 int mddev2_minor
= -1;
8784 mddev
->curr_resync
= MD_RESYNC_DELAYED
;
8787 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
8789 spin_lock(&all_mddevs_lock
);
8790 list_for_each_entry(mddev2
, &all_mddevs
, all_mddevs
) {
8791 if (mddev2
== mddev
)
8793 if (!mddev
->parallel_resync
8794 && mddev2
->curr_resync
8795 && match_mddev_units(mddev
, mddev2
)) {
8797 if (mddev
< mddev2
&&
8798 mddev
->curr_resync
== MD_RESYNC_DELAYED
) {
8799 /* arbitrarily yield */
8800 mddev
->curr_resync
= MD_RESYNC_YIELDED
;
8801 wake_up(&resync_wait
);
8803 if (mddev
> mddev2
&&
8804 mddev
->curr_resync
== MD_RESYNC_YIELDED
)
8805 /* no need to wait here, we can wait the next
8806 * time 'round when curr_resync == 2
8809 /* We need to wait 'interruptible' so as not to
8810 * contribute to the load average, and not to
8811 * be caught by 'softlockup'
8813 prepare_to_wait(&resync_wait
, &wq
, TASK_INTERRUPTIBLE
);
8814 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
8815 mddev2
->curr_resync
>= mddev
->curr_resync
) {
8816 if (mddev2_minor
!= mddev2
->md_minor
) {
8817 mddev2_minor
= mddev2
->md_minor
;
8818 pr_info("md: delaying %s of %s until %s has finished (they share one or more physical units)\n",
8819 desc
, mdname(mddev
),
8822 spin_unlock(&all_mddevs_lock
);
8824 if (signal_pending(current
))
8825 flush_signals(current
);
8827 finish_wait(&resync_wait
, &wq
);
8830 finish_wait(&resync_wait
, &wq
);
8833 spin_unlock(&all_mddevs_lock
);
8834 } while (mddev
->curr_resync
< MD_RESYNC_DELAYED
);
8837 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
8838 /* resync follows the size requested by the personality,
8839 * which defaults to physical size, but can be virtual size
8841 max_sectors
= mddev
->resync_max_sectors
;
8842 atomic64_set(&mddev
->resync_mismatches
, 0);
8843 /* we don't use the checkpoint if there's a bitmap */
8844 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
8845 j
= mddev
->resync_min
;
8846 else if (!mddev
->bitmap
)
8847 j
= mddev
->recovery_cp
;
8849 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)) {
8850 max_sectors
= mddev
->resync_max_sectors
;
8852 * If the original node aborts reshaping then we continue the
8853 * reshaping, so set j again to avoid restart reshape from the
8856 if (mddev_is_clustered(mddev
) &&
8857 mddev
->reshape_position
!= MaxSector
)
8858 j
= mddev
->reshape_position
;
8860 /* recovery follows the physical size of devices */
8861 max_sectors
= mddev
->dev_sectors
;
8864 rdev_for_each_rcu(rdev
, mddev
)
8865 if (rdev
->raid_disk
>= 0 &&
8866 !test_bit(Journal
, &rdev
->flags
) &&
8867 !test_bit(Faulty
, &rdev
->flags
) &&
8868 !test_bit(In_sync
, &rdev
->flags
) &&
8869 rdev
->recovery_offset
< j
)
8870 j
= rdev
->recovery_offset
;
8873 /* If there is a bitmap, we need to make sure all
8874 * writes that started before we added a spare
8875 * complete before we start doing a recovery.
8876 * Otherwise the write might complete and (via
8877 * bitmap_endwrite) set a bit in the bitmap after the
8878 * recovery has checked that bit and skipped that
8881 if (mddev
->bitmap
) {
8882 mddev
->pers
->quiesce(mddev
, 1);
8883 mddev
->pers
->quiesce(mddev
, 0);
8887 pr_info("md: %s of RAID array %s\n", desc
, mdname(mddev
));
8888 pr_debug("md: minimum _guaranteed_ speed: %d KB/sec/disk.\n", speed_min(mddev
));
8889 pr_debug("md: using maximum available idle IO bandwidth (but not more than %d KB/sec) for %s.\n",
8890 speed_max(mddev
), desc
);
8892 is_mddev_idle(mddev
, 1); /* this initializes IO event counters */
8895 for (m
= 0; m
< SYNC_MARKS
; m
++) {
8897 mark_cnt
[m
] = io_sectors
;
8900 mddev
->resync_mark
= mark
[last_mark
];
8901 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
8904 * Tune reconstruction:
8906 window
= 32 * (PAGE_SIZE
/ 512);
8907 pr_debug("md: using %dk window, over a total of %lluk.\n",
8908 window
/2, (unsigned long long)max_sectors
/2);
8910 atomic_set(&mddev
->recovery_active
, 0);
8914 pr_debug("md: resuming %s of %s from checkpoint.\n",
8915 desc
, mdname(mddev
));
8916 mddev
->curr_resync
= j
;
8918 mddev
->curr_resync
= MD_RESYNC_ACTIVE
; /* no longer delayed */
8919 mddev
->curr_resync_completed
= j
;
8920 sysfs_notify_dirent_safe(mddev
->sysfs_completed
);
8922 update_time
= jiffies
;
8924 blk_start_plug(&plug
);
8925 while (j
< max_sectors
) {
8930 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
8931 ((mddev
->curr_resync
> mddev
->curr_resync_completed
&&
8932 (mddev
->curr_resync
- mddev
->curr_resync_completed
)
8933 > (max_sectors
>> 4)) ||
8934 time_after_eq(jiffies
, update_time
+ UPDATE_FREQUENCY
) ||
8935 (j
- mddev
->curr_resync_completed
)*2
8936 >= mddev
->resync_max
- mddev
->curr_resync_completed
||
8937 mddev
->curr_resync_completed
> mddev
->resync_max
8939 /* time to update curr_resync_completed */
8940 wait_event(mddev
->recovery_wait
,
8941 atomic_read(&mddev
->recovery_active
) == 0);
8942 mddev
->curr_resync_completed
= j
;
8943 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) &&
8944 j
> mddev
->recovery_cp
)
8945 mddev
->recovery_cp
= j
;
8946 update_time
= jiffies
;
8947 set_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
8948 sysfs_notify_dirent_safe(mddev
->sysfs_completed
);
8951 while (j
>= mddev
->resync_max
&&
8952 !test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
8953 /* As this condition is controlled by user-space,
8954 * we can block indefinitely, so use '_interruptible'
8955 * to avoid triggering warnings.
8957 flush_signals(current
); /* just in case */
8958 wait_event_interruptible(mddev
->recovery_wait
,
8959 mddev
->resync_max
> j
8960 || test_bit(MD_RECOVERY_INTR
,
8964 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
8967 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
);
8969 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8973 if (!skipped
) { /* actual IO requested */
8974 io_sectors
+= sectors
;
8975 atomic_add(sectors
, &mddev
->recovery_active
);
8978 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
8982 if (j
> max_sectors
)
8983 /* when skipping, extra large numbers can be returned. */
8986 mddev
->curr_resync
= j
;
8987 mddev
->curr_mark_cnt
= io_sectors
;
8988 if (last_check
== 0)
8989 /* this is the earliest that rebuild will be
8990 * visible in /proc/mdstat
8994 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
8997 last_check
= io_sectors
;
8999 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
9001 int next
= (last_mark
+1) % SYNC_MARKS
;
9003 mddev
->resync_mark
= mark
[next
];
9004 mddev
->resync_mark_cnt
= mark_cnt
[next
];
9005 mark
[next
] = jiffies
;
9006 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
9010 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
9014 * this loop exits only if either when we are slower than
9015 * the 'hard' speed limit, or the system was IO-idle for
9017 * the system might be non-idle CPU-wise, but we only care
9018 * about not overloading the IO subsystem. (things like an
9019 * e2fsck being done on the RAID array should execute fast)
9023 recovery_done
= io_sectors
- atomic_read(&mddev
->recovery_active
);
9024 currspeed
= ((unsigned long)(recovery_done
- mddev
->resync_mark_cnt
))/2
9025 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
9027 if (currspeed
> speed_min(mddev
)) {
9028 if (currspeed
> speed_max(mddev
)) {
9032 if (!is_mddev_idle(mddev
, 0)) {
9034 * Give other IO more of a chance.
9035 * The faster the devices, the less we wait.
9037 wait_event(mddev
->recovery_wait
,
9038 !atomic_read(&mddev
->recovery_active
));
9042 pr_info("md: %s: %s %s.\n",mdname(mddev
), desc
,
9043 test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)
9044 ? "interrupted" : "done");
9046 * this also signals 'finished resyncing' to md_stop
9048 blk_finish_plug(&plug
);
9049 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
9051 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
9052 !test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
9053 mddev
->curr_resync
>= MD_RESYNC_ACTIVE
) {
9054 mddev
->curr_resync_completed
= mddev
->curr_resync
;
9055 sysfs_notify_dirent_safe(mddev
->sysfs_completed
);
9057 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
);
9059 if (!test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
) &&
9060 mddev
->curr_resync
>= MD_RESYNC_ACTIVE
) {
9061 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
9062 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
9063 if (mddev
->curr_resync
>= mddev
->recovery_cp
) {
9064 pr_debug("md: checkpointing %s of %s.\n",
9065 desc
, mdname(mddev
));
9066 if (test_bit(MD_RECOVERY_ERROR
,
9068 mddev
->recovery_cp
=
9069 mddev
->curr_resync_completed
;
9071 mddev
->recovery_cp
=
9075 mddev
->recovery_cp
= MaxSector
;
9077 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
9078 mddev
->curr_resync
= MaxSector
;
9079 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
9080 test_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
)) {
9082 rdev_for_each_rcu(rdev
, mddev
)
9083 if (rdev
->raid_disk
>= 0 &&
9084 mddev
->delta_disks
>= 0 &&
9085 !test_bit(Journal
, &rdev
->flags
) &&
9086 !test_bit(Faulty
, &rdev
->flags
) &&
9087 !test_bit(In_sync
, &rdev
->flags
) &&
9088 rdev
->recovery_offset
< mddev
->curr_resync
)
9089 rdev
->recovery_offset
= mddev
->curr_resync
;
9095 /* set CHANGE_PENDING here since maybe another update is needed,
9096 * so other nodes are informed. It should be harmless for normal
9098 set_mask_bits(&mddev
->sb_flags
, 0,
9099 BIT(MD_SB_CHANGE_PENDING
) | BIT(MD_SB_CHANGE_DEVS
));
9101 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
9102 !test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
9103 mddev
->delta_disks
> 0 &&
9104 mddev
->pers
->finish_reshape
&&
9105 mddev
->pers
->size
&&
9107 mddev_lock_nointr(mddev
);
9108 md_set_array_sectors(mddev
, mddev
->pers
->size(mddev
, 0, 0));
9109 mddev_unlock(mddev
);
9110 if (!mddev_is_clustered(mddev
))
9111 set_capacity_and_notify(mddev
->gendisk
,
9112 mddev
->array_sectors
);
9115 spin_lock(&mddev
->lock
);
9116 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
9117 /* We completed so min/max setting can be forgotten if used. */
9118 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
9119 mddev
->resync_min
= 0;
9120 mddev
->resync_max
= MaxSector
;
9121 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
9122 mddev
->resync_min
= mddev
->curr_resync_completed
;
9123 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
9124 mddev
->curr_resync
= MD_RESYNC_NONE
;
9125 spin_unlock(&mddev
->lock
);
9127 wake_up(&resync_wait
);
9128 md_wakeup_thread(mddev
->thread
);
9131 EXPORT_SYMBOL_GPL(md_do_sync
);
9133 static int remove_and_add_spares(struct mddev
*mddev
,
9134 struct md_rdev
*this)
9136 struct md_rdev
*rdev
;
9139 bool remove_some
= false;
9141 if (this && test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
9142 /* Mustn't remove devices when resync thread is running */
9145 rdev_for_each(rdev
, mddev
) {
9146 if ((this == NULL
|| rdev
== this) &&
9147 rdev
->raid_disk
>= 0 &&
9148 !test_bit(Blocked
, &rdev
->flags
) &&
9149 test_bit(Faulty
, &rdev
->flags
) &&
9150 atomic_read(&rdev
->nr_pending
)==0) {
9151 /* Faulty non-Blocked devices with nr_pending == 0
9152 * never get nr_pending incremented,
9153 * never get Faulty cleared, and never get Blocked set.
9154 * So we can synchronize_rcu now rather than once per device
9157 set_bit(RemoveSynchronized
, &rdev
->flags
);
9163 rdev_for_each(rdev
, mddev
) {
9164 if ((this == NULL
|| rdev
== this) &&
9165 rdev
->raid_disk
>= 0 &&
9166 !test_bit(Blocked
, &rdev
->flags
) &&
9167 ((test_bit(RemoveSynchronized
, &rdev
->flags
) ||
9168 (!test_bit(In_sync
, &rdev
->flags
) &&
9169 !test_bit(Journal
, &rdev
->flags
))) &&
9170 atomic_read(&rdev
->nr_pending
)==0)) {
9171 if (mddev
->pers
->hot_remove_disk(
9172 mddev
, rdev
) == 0) {
9173 sysfs_unlink_rdev(mddev
, rdev
);
9174 rdev
->saved_raid_disk
= rdev
->raid_disk
;
9175 rdev
->raid_disk
= -1;
9179 if (remove_some
&& test_bit(RemoveSynchronized
, &rdev
->flags
))
9180 clear_bit(RemoveSynchronized
, &rdev
->flags
);
9183 if (removed
&& mddev
->kobj
.sd
)
9184 sysfs_notify_dirent_safe(mddev
->sysfs_degraded
);
9186 if (this && removed
)
9189 rdev_for_each(rdev
, mddev
) {
9190 if (this && this != rdev
)
9192 if (test_bit(Candidate
, &rdev
->flags
))
9194 if (rdev
->raid_disk
>= 0 &&
9195 !test_bit(In_sync
, &rdev
->flags
) &&
9196 !test_bit(Journal
, &rdev
->flags
) &&
9197 !test_bit(Faulty
, &rdev
->flags
))
9199 if (rdev
->raid_disk
>= 0)
9201 if (test_bit(Faulty
, &rdev
->flags
))
9203 if (!test_bit(Journal
, &rdev
->flags
)) {
9205 ! (rdev
->saved_raid_disk
>= 0 &&
9206 !test_bit(Bitmap_sync
, &rdev
->flags
)))
9209 rdev
->recovery_offset
= 0;
9211 if (mddev
->pers
->hot_add_disk(mddev
, rdev
) == 0) {
9212 /* failure here is OK */
9213 sysfs_link_rdev(mddev
, rdev
);
9214 if (!test_bit(Journal
, &rdev
->flags
))
9217 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
9222 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
9226 static void md_start_sync(struct work_struct
*ws
)
9228 struct mddev
*mddev
= container_of(ws
, struct mddev
, del_work
);
9230 mddev
->sync_thread
= md_register_thread(md_do_sync
,
9233 if (!mddev
->sync_thread
) {
9234 pr_warn("%s: could not start resync thread...\n",
9236 /* leave the spares where they are, it shouldn't hurt */
9237 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
9238 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
9239 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
9240 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
9241 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
9242 wake_up(&resync_wait
);
9243 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
9245 if (mddev
->sysfs_action
)
9246 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
9248 md_wakeup_thread(mddev
->sync_thread
);
9249 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
9254 * This routine is regularly called by all per-raid-array threads to
9255 * deal with generic issues like resync and super-block update.
9256 * Raid personalities that don't have a thread (linear/raid0) do not
9257 * need this as they never do any recovery or update the superblock.
9259 * It does not do any resync itself, but rather "forks" off other threads
9260 * to do that as needed.
9261 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
9262 * "->recovery" and create a thread at ->sync_thread.
9263 * When the thread finishes it sets MD_RECOVERY_DONE
9264 * and wakeups up this thread which will reap the thread and finish up.
9265 * This thread also removes any faulty devices (with nr_pending == 0).
9267 * The overall approach is:
9268 * 1/ if the superblock needs updating, update it.
9269 * 2/ If a recovery thread is running, don't do anything else.
9270 * 3/ If recovery has finished, clean up, possibly marking spares active.
9271 * 4/ If there are any faulty devices, remove them.
9272 * 5/ If array is degraded, try to add spares devices
9273 * 6/ If array has spares or is not in-sync, start a resync thread.
9275 void md_check_recovery(struct mddev
*mddev
)
9277 if (test_bit(MD_ALLOW_SB_UPDATE
, &mddev
->flags
) && mddev
->sb_flags
) {
9278 /* Write superblock - thread that called mddev_suspend()
9279 * holds reconfig_mutex for us.
9281 set_bit(MD_UPDATING_SB
, &mddev
->flags
);
9282 smp_mb__after_atomic();
9283 if (test_bit(MD_ALLOW_SB_UPDATE
, &mddev
->flags
))
9284 md_update_sb(mddev
, 0);
9285 clear_bit_unlock(MD_UPDATING_SB
, &mddev
->flags
);
9286 wake_up(&mddev
->sb_wait
);
9289 if (mddev
->suspended
)
9293 md_bitmap_daemon_work(mddev
);
9295 if (signal_pending(current
)) {
9296 if (mddev
->pers
->sync_request
&& !mddev
->external
) {
9297 pr_debug("md: %s in immediate safe mode\n",
9299 mddev
->safemode
= 2;
9301 flush_signals(current
);
9304 if (mddev
->ro
&& !test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
9307 (mddev
->sb_flags
& ~ (1<<MD_SB_CHANGE_PENDING
)) ||
9308 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
9309 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
9310 (mddev
->external
== 0 && mddev
->safemode
== 1) ||
9311 (mddev
->safemode
== 2
9312 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
9316 if (mddev_trylock(mddev
)) {
9318 bool try_set_sync
= mddev
->safemode
!= 0;
9320 if (!mddev
->external
&& mddev
->safemode
== 1)
9321 mddev
->safemode
= 0;
9324 struct md_rdev
*rdev
;
9325 if (!mddev
->external
&& mddev
->in_sync
)
9326 /* 'Blocked' flag not needed as failed devices
9327 * will be recorded if array switched to read/write.
9328 * Leaving it set will prevent the device
9329 * from being removed.
9331 rdev_for_each(rdev
, mddev
)
9332 clear_bit(Blocked
, &rdev
->flags
);
9333 /* On a read-only array we can:
9334 * - remove failed devices
9335 * - add already-in_sync devices if the array itself
9337 * As we only add devices that are already in-sync,
9338 * we can activate the spares immediately.
9340 remove_and_add_spares(mddev
, NULL
);
9341 /* There is no thread, but we need to call
9342 * ->spare_active and clear saved_raid_disk
9344 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
9345 md_unregister_thread(&mddev
->sync_thread
);
9346 md_reap_sync_thread(mddev
);
9347 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
9348 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
9349 clear_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
9353 if (mddev_is_clustered(mddev
)) {
9354 struct md_rdev
*rdev
, *tmp
;
9355 /* kick the device if another node issued a
9358 rdev_for_each_safe(rdev
, tmp
, mddev
) {
9359 if (test_and_clear_bit(ClusterRemove
, &rdev
->flags
) &&
9360 rdev
->raid_disk
< 0)
9361 md_kick_rdev_from_array(rdev
);
9365 if (try_set_sync
&& !mddev
->external
&& !mddev
->in_sync
) {
9366 spin_lock(&mddev
->lock
);
9368 spin_unlock(&mddev
->lock
);
9371 if (mddev
->sb_flags
)
9372 md_update_sb(mddev
, 0);
9374 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
9375 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
9376 /* resync/recovery still happening */
9377 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
9380 if (mddev
->sync_thread
) {
9381 md_unregister_thread(&mddev
->sync_thread
);
9382 md_reap_sync_thread(mddev
);
9385 /* Set RUNNING before clearing NEEDED to avoid
9386 * any transients in the value of "sync_action".
9388 mddev
->curr_resync_completed
= 0;
9389 spin_lock(&mddev
->lock
);
9390 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
9391 spin_unlock(&mddev
->lock
);
9392 /* Clear some bits that don't mean anything, but
9395 clear_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
9396 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
9398 if (!test_and_clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
9399 test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
9401 /* no recovery is running.
9402 * remove any failed drives, then
9403 * add spares if possible.
9404 * Spares are also removed and re-added, to allow
9405 * the personality to fail the re-add.
9408 if (mddev
->reshape_position
!= MaxSector
) {
9409 if (mddev
->pers
->check_reshape
== NULL
||
9410 mddev
->pers
->check_reshape(mddev
) != 0)
9411 /* Cannot proceed */
9413 set_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
9414 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
9415 } else if ((spares
= remove_and_add_spares(mddev
, NULL
))) {
9416 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
9417 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
9418 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
9419 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
9420 } else if (mddev
->recovery_cp
< MaxSector
) {
9421 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
9422 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
9423 } else if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
9424 /* nothing to be done ... */
9427 if (mddev
->pers
->sync_request
) {
9429 /* We are adding a device or devices to an array
9430 * which has the bitmap stored on all devices.
9431 * So make sure all bitmap pages get written
9433 md_bitmap_write_all(mddev
->bitmap
);
9435 INIT_WORK(&mddev
->del_work
, md_start_sync
);
9436 queue_work(md_misc_wq
, &mddev
->del_work
);
9440 if (!mddev
->sync_thread
) {
9441 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
9442 wake_up(&resync_wait
);
9443 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
9445 if (mddev
->sysfs_action
)
9446 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
9449 wake_up(&mddev
->sb_wait
);
9450 mddev_unlock(mddev
);
9453 EXPORT_SYMBOL(md_check_recovery
);
9455 void md_reap_sync_thread(struct mddev
*mddev
)
9457 struct md_rdev
*rdev
;
9458 sector_t old_dev_sectors
= mddev
->dev_sectors
;
9459 bool is_reshaped
= false;
9461 /* sync_thread should be unregistered, collect result */
9462 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
9463 !test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
) &&
9464 mddev
->degraded
!= mddev
->raid_disks
) {
9466 /* activate any spares */
9467 if (mddev
->pers
->spare_active(mddev
)) {
9468 sysfs_notify_dirent_safe(mddev
->sysfs_degraded
);
9469 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
9472 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
9473 mddev
->pers
->finish_reshape
) {
9474 mddev
->pers
->finish_reshape(mddev
);
9475 if (mddev_is_clustered(mddev
))
9479 /* If array is no-longer degraded, then any saved_raid_disk
9480 * information must be scrapped.
9482 if (!mddev
->degraded
)
9483 rdev_for_each(rdev
, mddev
)
9484 rdev
->saved_raid_disk
= -1;
9486 md_update_sb(mddev
, 1);
9487 /* MD_SB_CHANGE_PENDING should be cleared by md_update_sb, so we can
9488 * call resync_finish here if MD_CLUSTER_RESYNC_LOCKED is set by
9490 if (test_and_clear_bit(MD_CLUSTER_RESYNC_LOCKED
, &mddev
->flags
))
9491 md_cluster_ops
->resync_finish(mddev
);
9492 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
9493 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
9494 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
9495 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
9496 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
9497 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
9499 * We call md_cluster_ops->update_size here because sync_size could
9500 * be changed by md_update_sb, and MD_RECOVERY_RESHAPE is cleared,
9501 * so it is time to update size across cluster.
9503 if (mddev_is_clustered(mddev
) && is_reshaped
9504 && !test_bit(MD_CLOSING
, &mddev
->flags
))
9505 md_cluster_ops
->update_size(mddev
, old_dev_sectors
);
9506 wake_up(&resync_wait
);
9507 /* flag recovery needed just to double check */
9508 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
9509 sysfs_notify_dirent_safe(mddev
->sysfs_completed
);
9510 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
9512 if (mddev
->event_work
.func
)
9513 queue_work(md_misc_wq
, &mddev
->event_work
);
9515 EXPORT_SYMBOL(md_reap_sync_thread
);
9517 void md_wait_for_blocked_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
9519 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
9520 wait_event_timeout(rdev
->blocked_wait
,
9521 !test_bit(Blocked
, &rdev
->flags
) &&
9522 !test_bit(BlockedBadBlocks
, &rdev
->flags
),
9523 msecs_to_jiffies(5000));
9524 rdev_dec_pending(rdev
, mddev
);
9526 EXPORT_SYMBOL(md_wait_for_blocked_rdev
);
9528 void md_finish_reshape(struct mddev
*mddev
)
9530 /* called be personality module when reshape completes. */
9531 struct md_rdev
*rdev
;
9533 rdev_for_each(rdev
, mddev
) {
9534 if (rdev
->data_offset
> rdev
->new_data_offset
)
9535 rdev
->sectors
+= rdev
->data_offset
- rdev
->new_data_offset
;
9537 rdev
->sectors
-= rdev
->new_data_offset
- rdev
->data_offset
;
9538 rdev
->data_offset
= rdev
->new_data_offset
;
9541 EXPORT_SYMBOL(md_finish_reshape
);
9543 /* Bad block management */
9545 /* Returns 1 on success, 0 on failure */
9546 int rdev_set_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
9549 struct mddev
*mddev
= rdev
->mddev
;
9552 s
+= rdev
->new_data_offset
;
9554 s
+= rdev
->data_offset
;
9555 rv
= badblocks_set(&rdev
->badblocks
, s
, sectors
, 0);
9557 /* Make sure they get written out promptly */
9558 if (test_bit(ExternalBbl
, &rdev
->flags
))
9559 sysfs_notify_dirent_safe(rdev
->sysfs_unack_badblocks
);
9560 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
9561 set_mask_bits(&mddev
->sb_flags
, 0,
9562 BIT(MD_SB_CHANGE_CLEAN
) | BIT(MD_SB_CHANGE_PENDING
));
9563 md_wakeup_thread(rdev
->mddev
->thread
);
9568 EXPORT_SYMBOL_GPL(rdev_set_badblocks
);
9570 int rdev_clear_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
9575 s
+= rdev
->new_data_offset
;
9577 s
+= rdev
->data_offset
;
9578 rv
= badblocks_clear(&rdev
->badblocks
, s
, sectors
);
9579 if ((rv
== 0) && test_bit(ExternalBbl
, &rdev
->flags
))
9580 sysfs_notify_dirent_safe(rdev
->sysfs_badblocks
);
9583 EXPORT_SYMBOL_GPL(rdev_clear_badblocks
);
9585 static int md_notify_reboot(struct notifier_block
*this,
9586 unsigned long code
, void *x
)
9588 struct mddev
*mddev
, *n
;
9591 spin_lock(&all_mddevs_lock
);
9592 list_for_each_entry_safe(mddev
, n
, &all_mddevs
, all_mddevs
) {
9594 spin_unlock(&all_mddevs_lock
);
9595 if (mddev_trylock(mddev
)) {
9597 __md_stop_writes(mddev
);
9598 if (mddev
->persistent
)
9599 mddev
->safemode
= 2;
9600 mddev_unlock(mddev
);
9604 spin_lock(&all_mddevs_lock
);
9606 spin_unlock(&all_mddevs_lock
);
9609 * certain more exotic SCSI devices are known to be
9610 * volatile wrt too early system reboots. While the
9611 * right place to handle this issue is the given
9612 * driver, we do want to have a safe RAID driver ...
9620 static struct notifier_block md_notifier
= {
9621 .notifier_call
= md_notify_reboot
,
9623 .priority
= INT_MAX
, /* before any real devices */
9626 static void md_geninit(void)
9628 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
9630 proc_create("mdstat", S_IRUGO
, NULL
, &mdstat_proc_ops
);
9633 static int __init
md_init(void)
9637 md_wq
= alloc_workqueue("md", WQ_MEM_RECLAIM
, 0);
9641 md_misc_wq
= alloc_workqueue("md_misc", 0, 0);
9645 md_rdev_misc_wq
= alloc_workqueue("md_rdev_misc", 0, 0);
9646 if (!md_rdev_misc_wq
)
9647 goto err_rdev_misc_wq
;
9649 ret
= __register_blkdev(MD_MAJOR
, "md", md_probe
);
9653 ret
= __register_blkdev(0, "mdp", md_probe
);
9658 register_reboot_notifier(&md_notifier
);
9659 raid_table_header
= register_sysctl_table(raid_root_table
);
9665 unregister_blkdev(MD_MAJOR
, "md");
9667 destroy_workqueue(md_rdev_misc_wq
);
9669 destroy_workqueue(md_misc_wq
);
9671 destroy_workqueue(md_wq
);
9676 static void check_sb_changes(struct mddev
*mddev
, struct md_rdev
*rdev
)
9678 struct mdp_superblock_1
*sb
= page_address(rdev
->sb_page
);
9679 struct md_rdev
*rdev2
, *tmp
;
9683 * If size is changed in another node then we need to
9684 * do resize as well.
9686 if (mddev
->dev_sectors
!= le64_to_cpu(sb
->size
)) {
9687 ret
= mddev
->pers
->resize(mddev
, le64_to_cpu(sb
->size
));
9689 pr_info("md-cluster: resize failed\n");
9691 md_bitmap_update_sb(mddev
->bitmap
);
9694 /* Check for change of roles in the active devices */
9695 rdev_for_each_safe(rdev2
, tmp
, mddev
) {
9696 if (test_bit(Faulty
, &rdev2
->flags
))
9699 /* Check if the roles changed */
9700 role
= le16_to_cpu(sb
->dev_roles
[rdev2
->desc_nr
]);
9702 if (test_bit(Candidate
, &rdev2
->flags
)) {
9703 if (role
== MD_DISK_ROLE_FAULTY
) {
9704 pr_info("md: Removing Candidate device %pg because add failed\n",
9706 md_kick_rdev_from_array(rdev2
);
9710 clear_bit(Candidate
, &rdev2
->flags
);
9713 if (role
!= rdev2
->raid_disk
) {
9715 * got activated except reshape is happening.
9717 if (rdev2
->raid_disk
== -1 && role
!= MD_DISK_ROLE_SPARE
&&
9718 !(le32_to_cpu(sb
->feature_map
) &
9719 MD_FEATURE_RESHAPE_ACTIVE
)) {
9720 rdev2
->saved_raid_disk
= role
;
9721 ret
= remove_and_add_spares(mddev
, rdev2
);
9722 pr_info("Activated spare: %pg\n",
9724 /* wakeup mddev->thread here, so array could
9725 * perform resync with the new activated disk */
9726 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
9727 md_wakeup_thread(mddev
->thread
);
9730 * We just want to do the minimum to mark the disk
9731 * as faulty. The recovery is performed by the
9732 * one who initiated the error.
9734 if (role
== MD_DISK_ROLE_FAULTY
||
9735 role
== MD_DISK_ROLE_JOURNAL
) {
9736 md_error(mddev
, rdev2
);
9737 clear_bit(Blocked
, &rdev2
->flags
);
9742 if (mddev
->raid_disks
!= le32_to_cpu(sb
->raid_disks
)) {
9743 ret
= update_raid_disks(mddev
, le32_to_cpu(sb
->raid_disks
));
9745 pr_warn("md: updating array disks failed. %d\n", ret
);
9749 * Since mddev->delta_disks has already updated in update_raid_disks,
9750 * so it is time to check reshape.
9752 if (test_bit(MD_RESYNCING_REMOTE
, &mddev
->recovery
) &&
9753 (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
9755 * reshape is happening in the remote node, we need to
9756 * update reshape_position and call start_reshape.
9758 mddev
->reshape_position
= le64_to_cpu(sb
->reshape_position
);
9759 if (mddev
->pers
->update_reshape_pos
)
9760 mddev
->pers
->update_reshape_pos(mddev
);
9761 if (mddev
->pers
->start_reshape
)
9762 mddev
->pers
->start_reshape(mddev
);
9763 } else if (test_bit(MD_RESYNCING_REMOTE
, &mddev
->recovery
) &&
9764 mddev
->reshape_position
!= MaxSector
&&
9765 !(le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
9766 /* reshape is just done in another node. */
9767 mddev
->reshape_position
= MaxSector
;
9768 if (mddev
->pers
->update_reshape_pos
)
9769 mddev
->pers
->update_reshape_pos(mddev
);
9772 /* Finally set the event to be up to date */
9773 mddev
->events
= le64_to_cpu(sb
->events
);
9776 static int read_rdev(struct mddev
*mddev
, struct md_rdev
*rdev
)
9779 struct page
*swapout
= rdev
->sb_page
;
9780 struct mdp_superblock_1
*sb
;
9782 /* Store the sb page of the rdev in the swapout temporary
9783 * variable in case we err in the future
9785 rdev
->sb_page
= NULL
;
9786 err
= alloc_disk_sb(rdev
);
9788 ClearPageUptodate(rdev
->sb_page
);
9789 rdev
->sb_loaded
= 0;
9790 err
= super_types
[mddev
->major_version
].
9791 load_super(rdev
, NULL
, mddev
->minor_version
);
9794 pr_warn("%s: %d Could not reload rdev(%d) err: %d. Restoring old values\n",
9795 __func__
, __LINE__
, rdev
->desc_nr
, err
);
9797 put_page(rdev
->sb_page
);
9798 rdev
->sb_page
= swapout
;
9799 rdev
->sb_loaded
= 1;
9803 sb
= page_address(rdev
->sb_page
);
9804 /* Read the offset unconditionally, even if MD_FEATURE_RECOVERY_OFFSET
9808 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RECOVERY_OFFSET
))
9809 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
9811 /* The other node finished recovery, call spare_active to set
9812 * device In_sync and mddev->degraded
9814 if (rdev
->recovery_offset
== MaxSector
&&
9815 !test_bit(In_sync
, &rdev
->flags
) &&
9816 mddev
->pers
->spare_active(mddev
))
9817 sysfs_notify_dirent_safe(mddev
->sysfs_degraded
);
9823 void md_reload_sb(struct mddev
*mddev
, int nr
)
9825 struct md_rdev
*rdev
= NULL
, *iter
;
9829 rdev_for_each_rcu(iter
, mddev
) {
9830 if (iter
->desc_nr
== nr
) {
9837 pr_warn("%s: %d Could not find rdev with nr %d\n", __func__
, __LINE__
, nr
);
9841 err
= read_rdev(mddev
, rdev
);
9845 check_sb_changes(mddev
, rdev
);
9847 /* Read all rdev's to update recovery_offset */
9848 rdev_for_each_rcu(rdev
, mddev
) {
9849 if (!test_bit(Faulty
, &rdev
->flags
))
9850 read_rdev(mddev
, rdev
);
9853 EXPORT_SYMBOL(md_reload_sb
);
9858 * Searches all registered partitions for autorun RAID arrays
9862 static DEFINE_MUTEX(detected_devices_mutex
);
9863 static LIST_HEAD(all_detected_devices
);
9864 struct detected_devices_node
{
9865 struct list_head list
;
9869 void md_autodetect_dev(dev_t dev
)
9871 struct detected_devices_node
*node_detected_dev
;
9873 node_detected_dev
= kzalloc(sizeof(*node_detected_dev
), GFP_KERNEL
);
9874 if (node_detected_dev
) {
9875 node_detected_dev
->dev
= dev
;
9876 mutex_lock(&detected_devices_mutex
);
9877 list_add_tail(&node_detected_dev
->list
, &all_detected_devices
);
9878 mutex_unlock(&detected_devices_mutex
);
9882 void md_autostart_arrays(int part
)
9884 struct md_rdev
*rdev
;
9885 struct detected_devices_node
*node_detected_dev
;
9887 int i_scanned
, i_passed
;
9892 pr_info("md: Autodetecting RAID arrays.\n");
9894 mutex_lock(&detected_devices_mutex
);
9895 while (!list_empty(&all_detected_devices
) && i_scanned
< INT_MAX
) {
9897 node_detected_dev
= list_entry(all_detected_devices
.next
,
9898 struct detected_devices_node
, list
);
9899 list_del(&node_detected_dev
->list
);
9900 dev
= node_detected_dev
->dev
;
9901 kfree(node_detected_dev
);
9902 mutex_unlock(&detected_devices_mutex
);
9903 rdev
= md_import_device(dev
,0, 90);
9904 mutex_lock(&detected_devices_mutex
);
9908 if (test_bit(Faulty
, &rdev
->flags
))
9911 set_bit(AutoDetected
, &rdev
->flags
);
9912 list_add(&rdev
->same_set
, &pending_raid_disks
);
9915 mutex_unlock(&detected_devices_mutex
);
9917 pr_debug("md: Scanned %d and added %d devices.\n", i_scanned
, i_passed
);
9919 autorun_devices(part
);
9922 #endif /* !MODULE */
9924 static __exit
void md_exit(void)
9926 struct mddev
*mddev
;
9927 struct list_head
*tmp
;
9930 unregister_blkdev(MD_MAJOR
,"md");
9931 unregister_blkdev(mdp_major
, "mdp");
9932 unregister_reboot_notifier(&md_notifier
);
9933 unregister_sysctl_table(raid_table_header
);
9935 /* We cannot unload the modules while some process is
9936 * waiting for us in select() or poll() - wake them up
9939 while (waitqueue_active(&md_event_waiters
)) {
9940 /* not safe to leave yet */
9941 wake_up(&md_event_waiters
);
9945 remove_proc_entry("mdstat", NULL
);
9947 for_each_mddev(mddev
, tmp
) {
9948 export_array(mddev
);
9950 mddev
->hold_active
= 0;
9952 * for_each_mddev() will call mddev_put() at the end of each
9953 * iteration. As the mddev is now fully clear, this will
9954 * schedule the mddev for destruction by a workqueue, and the
9955 * destroy_workqueue() below will wait for that to complete.
9958 destroy_workqueue(md_rdev_misc_wq
);
9959 destroy_workqueue(md_misc_wq
);
9960 destroy_workqueue(md_wq
);
9963 subsys_initcall(md_init
);
9964 module_exit(md_exit
)
9966 static int get_ro(char *buffer
, const struct kernel_param
*kp
)
9968 return sprintf(buffer
, "%d\n", start_readonly
);
9970 static int set_ro(const char *val
, const struct kernel_param
*kp
)
9972 return kstrtouint(val
, 10, (unsigned int *)&start_readonly
);
9975 module_param_call(start_ro
, set_ro
, get_ro
, NULL
, S_IRUSR
|S_IWUSR
);
9976 module_param(start_dirty_degraded
, int, S_IRUGO
|S_IWUSR
);
9977 module_param_call(new_array
, add_named_array
, NULL
, NULL
, S_IWUSR
);
9978 module_param(create_on_open
, bool, S_IRUSR
|S_IWUSR
);
9980 MODULE_LICENSE("GPL");
9981 MODULE_DESCRIPTION("MD RAID framework");
9983 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);