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 overlaps(sector_t s1
, sector_t l1
, sector_t s2
, sector_t l2
)
3348 /* check if two start/length pairs overlap */
3356 static int strict_blocks_to_sectors(const char *buf
, sector_t
*sectors
)
3358 unsigned long long blocks
;
3361 if (kstrtoull(buf
, 10, &blocks
) < 0)
3364 if (blocks
& 1ULL << (8 * sizeof(blocks
) - 1))
3365 return -EINVAL
; /* sector conversion overflow */
3368 if (new != blocks
* 2)
3369 return -EINVAL
; /* unsigned long long to sector_t overflow */
3376 rdev_size_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3378 struct mddev
*my_mddev
= rdev
->mddev
;
3379 sector_t oldsectors
= rdev
->sectors
;
3382 if (test_bit(Journal
, &rdev
->flags
))
3384 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
3386 if (rdev
->data_offset
!= rdev
->new_data_offset
)
3387 return -EINVAL
; /* too confusing */
3388 if (my_mddev
->pers
&& rdev
->raid_disk
>= 0) {
3389 if (my_mddev
->persistent
) {
3390 sectors
= super_types
[my_mddev
->major_version
].
3391 rdev_size_change(rdev
, sectors
);
3394 } else if (!sectors
)
3395 sectors
= bdev_nr_sectors(rdev
->bdev
) -
3397 if (!my_mddev
->pers
->resize
)
3398 /* Cannot change size for RAID0 or Linear etc */
3401 if (sectors
< my_mddev
->dev_sectors
)
3402 return -EINVAL
; /* component must fit device */
3404 rdev
->sectors
= sectors
;
3405 if (sectors
> oldsectors
&& my_mddev
->external
) {
3406 /* Need to check that all other rdevs with the same
3407 * ->bdev do not overlap. 'rcu' is sufficient to walk
3408 * the rdev lists safely.
3409 * This check does not provide a hard guarantee, it
3410 * just helps avoid dangerous mistakes.
3412 struct mddev
*mddev
;
3414 struct list_head
*tmp
;
3417 for_each_mddev(mddev
, tmp
) {
3418 struct md_rdev
*rdev2
;
3420 rdev_for_each(rdev2
, mddev
)
3421 if (rdev
->bdev
== rdev2
->bdev
&&
3423 overlaps(rdev
->data_offset
, rdev
->sectors
,
3436 /* Someone else could have slipped in a size
3437 * change here, but doing so is just silly.
3438 * We put oldsectors back because we *know* it is
3439 * safe, and trust userspace not to race with
3442 rdev
->sectors
= oldsectors
;
3449 static struct rdev_sysfs_entry rdev_size
=
3450 __ATTR(size
, S_IRUGO
|S_IWUSR
, rdev_size_show
, rdev_size_store
);
3452 static ssize_t
recovery_start_show(struct md_rdev
*rdev
, char *page
)
3454 unsigned long long recovery_start
= rdev
->recovery_offset
;
3456 if (test_bit(In_sync
, &rdev
->flags
) ||
3457 recovery_start
== MaxSector
)
3458 return sprintf(page
, "none\n");
3460 return sprintf(page
, "%llu\n", recovery_start
);
3463 static ssize_t
recovery_start_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3465 unsigned long long recovery_start
;
3467 if (cmd_match(buf
, "none"))
3468 recovery_start
= MaxSector
;
3469 else if (kstrtoull(buf
, 10, &recovery_start
))
3472 if (rdev
->mddev
->pers
&&
3473 rdev
->raid_disk
>= 0)
3476 rdev
->recovery_offset
= recovery_start
;
3477 if (recovery_start
== MaxSector
)
3478 set_bit(In_sync
, &rdev
->flags
);
3480 clear_bit(In_sync
, &rdev
->flags
);
3484 static struct rdev_sysfs_entry rdev_recovery_start
=
3485 __ATTR(recovery_start
, S_IRUGO
|S_IWUSR
, recovery_start_show
, recovery_start_store
);
3487 /* sysfs access to bad-blocks list.
3488 * We present two files.
3489 * 'bad-blocks' lists sector numbers and lengths of ranges that
3490 * are recorded as bad. The list is truncated to fit within
3491 * the one-page limit of sysfs.
3492 * Writing "sector length" to this file adds an acknowledged
3494 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
3495 * been acknowledged. Writing to this file adds bad blocks
3496 * without acknowledging them. This is largely for testing.
3498 static ssize_t
bb_show(struct md_rdev
*rdev
, char *page
)
3500 return badblocks_show(&rdev
->badblocks
, page
, 0);
3502 static ssize_t
bb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
3504 int rv
= badblocks_store(&rdev
->badblocks
, page
, len
, 0);
3505 /* Maybe that ack was all we needed */
3506 if (test_and_clear_bit(BlockedBadBlocks
, &rdev
->flags
))
3507 wake_up(&rdev
->blocked_wait
);
3510 static struct rdev_sysfs_entry rdev_bad_blocks
=
3511 __ATTR(bad_blocks
, S_IRUGO
|S_IWUSR
, bb_show
, bb_store
);
3513 static ssize_t
ubb_show(struct md_rdev
*rdev
, char *page
)
3515 return badblocks_show(&rdev
->badblocks
, page
, 1);
3517 static ssize_t
ubb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
3519 return badblocks_store(&rdev
->badblocks
, page
, len
, 1);
3521 static struct rdev_sysfs_entry rdev_unack_bad_blocks
=
3522 __ATTR(unacknowledged_bad_blocks
, S_IRUGO
|S_IWUSR
, ubb_show
, ubb_store
);
3525 ppl_sector_show(struct md_rdev
*rdev
, char *page
)
3527 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->ppl
.sector
);
3531 ppl_sector_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3533 unsigned long long sector
;
3535 if (kstrtoull(buf
, 10, §or
) < 0)
3537 if (sector
!= (sector_t
)sector
)
3540 if (rdev
->mddev
->pers
&& test_bit(MD_HAS_PPL
, &rdev
->mddev
->flags
) &&
3541 rdev
->raid_disk
>= 0)
3544 if (rdev
->mddev
->persistent
) {
3545 if (rdev
->mddev
->major_version
== 0)
3547 if ((sector
> rdev
->sb_start
&&
3548 sector
- rdev
->sb_start
> S16_MAX
) ||
3549 (sector
< rdev
->sb_start
&&
3550 rdev
->sb_start
- sector
> -S16_MIN
))
3552 rdev
->ppl
.offset
= sector
- rdev
->sb_start
;
3553 } else if (!rdev
->mddev
->external
) {
3556 rdev
->ppl
.sector
= sector
;
3560 static struct rdev_sysfs_entry rdev_ppl_sector
=
3561 __ATTR(ppl_sector
, S_IRUGO
|S_IWUSR
, ppl_sector_show
, ppl_sector_store
);
3564 ppl_size_show(struct md_rdev
*rdev
, char *page
)
3566 return sprintf(page
, "%u\n", rdev
->ppl
.size
);
3570 ppl_size_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3574 if (kstrtouint(buf
, 10, &size
) < 0)
3577 if (rdev
->mddev
->pers
&& test_bit(MD_HAS_PPL
, &rdev
->mddev
->flags
) &&
3578 rdev
->raid_disk
>= 0)
3581 if (rdev
->mddev
->persistent
) {
3582 if (rdev
->mddev
->major_version
== 0)
3586 } else if (!rdev
->mddev
->external
) {
3589 rdev
->ppl
.size
= size
;
3593 static struct rdev_sysfs_entry rdev_ppl_size
=
3594 __ATTR(ppl_size
, S_IRUGO
|S_IWUSR
, ppl_size_show
, ppl_size_store
);
3596 static struct attribute
*rdev_default_attrs
[] = {
3601 &rdev_new_offset
.attr
,
3603 &rdev_recovery_start
.attr
,
3604 &rdev_bad_blocks
.attr
,
3605 &rdev_unack_bad_blocks
.attr
,
3606 &rdev_ppl_sector
.attr
,
3607 &rdev_ppl_size
.attr
,
3610 ATTRIBUTE_GROUPS(rdev_default
);
3612 rdev_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
3614 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
3615 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
3621 return entry
->show(rdev
, page
);
3625 rdev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
3626 const char *page
, size_t length
)
3628 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
3629 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
3631 struct mddev
*mddev
= rdev
->mddev
;
3635 if (!capable(CAP_SYS_ADMIN
))
3637 rv
= mddev
? mddev_lock(mddev
) : -ENODEV
;
3639 if (rdev
->mddev
== NULL
)
3642 rv
= entry
->store(rdev
, page
, length
);
3643 mddev_unlock(mddev
);
3648 static void rdev_free(struct kobject
*ko
)
3650 struct md_rdev
*rdev
= container_of(ko
, struct md_rdev
, kobj
);
3653 static const struct sysfs_ops rdev_sysfs_ops
= {
3654 .show
= rdev_attr_show
,
3655 .store
= rdev_attr_store
,
3657 static struct kobj_type rdev_ktype
= {
3658 .release
= rdev_free
,
3659 .sysfs_ops
= &rdev_sysfs_ops
,
3660 .default_groups
= rdev_default_groups
,
3663 int md_rdev_init(struct md_rdev
*rdev
)
3666 rdev
->saved_raid_disk
= -1;
3667 rdev
->raid_disk
= -1;
3669 rdev
->data_offset
= 0;
3670 rdev
->new_data_offset
= 0;
3671 rdev
->sb_events
= 0;
3672 rdev
->last_read_error
= 0;
3673 rdev
->sb_loaded
= 0;
3674 rdev
->bb_page
= NULL
;
3675 atomic_set(&rdev
->nr_pending
, 0);
3676 atomic_set(&rdev
->read_errors
, 0);
3677 atomic_set(&rdev
->corrected_errors
, 0);
3679 INIT_LIST_HEAD(&rdev
->same_set
);
3680 init_waitqueue_head(&rdev
->blocked_wait
);
3682 /* Add space to store bad block list.
3683 * This reserves the space even on arrays where it cannot
3684 * be used - I wonder if that matters
3686 return badblocks_init(&rdev
->badblocks
, 0);
3688 EXPORT_SYMBOL_GPL(md_rdev_init
);
3690 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3692 * mark the device faulty if:
3694 * - the device is nonexistent (zero size)
3695 * - the device has no valid superblock
3697 * a faulty rdev _never_ has rdev->sb set.
3699 static struct md_rdev
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
3702 struct md_rdev
*rdev
;
3705 rdev
= kzalloc(sizeof(*rdev
), GFP_KERNEL
);
3707 return ERR_PTR(-ENOMEM
);
3709 err
= md_rdev_init(rdev
);
3712 err
= alloc_disk_sb(rdev
);
3716 err
= lock_rdev(rdev
, newdev
, super_format
== -2);
3720 kobject_init(&rdev
->kobj
, &rdev_ktype
);
3722 size
= bdev_nr_bytes(rdev
->bdev
) >> BLOCK_SIZE_BITS
;
3724 pr_warn("md: %pg has zero or unknown size, marking faulty!\n",
3730 if (super_format
>= 0) {
3731 err
= super_types
[super_format
].
3732 load_super(rdev
, NULL
, super_minor
);
3733 if (err
== -EINVAL
) {
3734 pr_warn("md: %pg does not have a valid v%d.%d superblock, not importing!\n",
3736 super_format
, super_minor
);
3740 pr_warn("md: could not read %pg's sb, not importing!\n",
3751 md_rdev_clear(rdev
);
3753 return ERR_PTR(err
);
3757 * Check a full RAID array for plausibility
3760 static int analyze_sbs(struct mddev
*mddev
)
3763 struct md_rdev
*rdev
, *freshest
, *tmp
;
3766 rdev_for_each_safe(rdev
, tmp
, mddev
)
3767 switch (super_types
[mddev
->major_version
].
3768 load_super(rdev
, freshest
, mddev
->minor_version
)) {
3775 pr_warn("md: fatal superblock inconsistency in %pg -- removing from array\n",
3777 md_kick_rdev_from_array(rdev
);
3780 /* Cannot find a valid fresh disk */
3782 pr_warn("md: cannot find a valid disk\n");
3786 super_types
[mddev
->major_version
].
3787 validate_super(mddev
, freshest
);
3790 rdev_for_each_safe(rdev
, tmp
, mddev
) {
3791 if (mddev
->max_disks
&&
3792 (rdev
->desc_nr
>= mddev
->max_disks
||
3793 i
> mddev
->max_disks
)) {
3794 pr_warn("md: %s: %pg: only %d devices permitted\n",
3795 mdname(mddev
), rdev
->bdev
,
3797 md_kick_rdev_from_array(rdev
);
3800 if (rdev
!= freshest
) {
3801 if (super_types
[mddev
->major_version
].
3802 validate_super(mddev
, rdev
)) {
3803 pr_warn("md: kicking non-fresh %pg from array!\n",
3805 md_kick_rdev_from_array(rdev
);
3809 if (mddev
->level
== LEVEL_MULTIPATH
) {
3810 rdev
->desc_nr
= i
++;
3811 rdev
->raid_disk
= rdev
->desc_nr
;
3812 set_bit(In_sync
, &rdev
->flags
);
3813 } else if (rdev
->raid_disk
>=
3814 (mddev
->raid_disks
- min(0, mddev
->delta_disks
)) &&
3815 !test_bit(Journal
, &rdev
->flags
)) {
3816 rdev
->raid_disk
= -1;
3817 clear_bit(In_sync
, &rdev
->flags
);
3824 /* Read a fixed-point number.
3825 * Numbers in sysfs attributes should be in "standard" units where
3826 * possible, so time should be in seconds.
3827 * However we internally use a a much smaller unit such as
3828 * milliseconds or jiffies.
3829 * This function takes a decimal number with a possible fractional
3830 * component, and produces an integer which is the result of
3831 * multiplying that number by 10^'scale'.
3832 * all without any floating-point arithmetic.
3834 int strict_strtoul_scaled(const char *cp
, unsigned long *res
, int scale
)
3836 unsigned long result
= 0;
3838 while (isdigit(*cp
) || (*cp
== '.' && decimals
< 0)) {
3841 else if (decimals
< scale
) {
3844 result
= result
* 10 + value
;
3856 *res
= result
* int_pow(10, scale
- decimals
);
3861 safe_delay_show(struct mddev
*mddev
, char *page
)
3863 int msec
= (mddev
->safemode_delay
*1000)/HZ
;
3864 return sprintf(page
, "%d.%03d\n", msec
/1000, msec
%1000);
3867 safe_delay_store(struct mddev
*mddev
, const char *cbuf
, size_t len
)
3871 if (mddev_is_clustered(mddev
)) {
3872 pr_warn("md: Safemode is disabled for clustered mode\n");
3876 if (strict_strtoul_scaled(cbuf
, &msec
, 3) < 0)
3879 mddev
->safemode_delay
= 0;
3881 unsigned long old_delay
= mddev
->safemode_delay
;
3882 unsigned long new_delay
= (msec
*HZ
)/1000;
3886 mddev
->safemode_delay
= new_delay
;
3887 if (new_delay
< old_delay
|| old_delay
== 0)
3888 mod_timer(&mddev
->safemode_timer
, jiffies
+1);
3892 static struct md_sysfs_entry md_safe_delay
=
3893 __ATTR(safe_mode_delay
, S_IRUGO
|S_IWUSR
,safe_delay_show
, safe_delay_store
);
3896 level_show(struct mddev
*mddev
, char *page
)
3898 struct md_personality
*p
;
3900 spin_lock(&mddev
->lock
);
3903 ret
= sprintf(page
, "%s\n", p
->name
);
3904 else if (mddev
->clevel
[0])
3905 ret
= sprintf(page
, "%s\n", mddev
->clevel
);
3906 else if (mddev
->level
!= LEVEL_NONE
)
3907 ret
= sprintf(page
, "%d\n", mddev
->level
);
3910 spin_unlock(&mddev
->lock
);
3915 level_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3920 struct md_personality
*pers
, *oldpers
;
3922 void *priv
, *oldpriv
;
3923 struct md_rdev
*rdev
;
3925 if (slen
== 0 || slen
>= sizeof(clevel
))
3928 rv
= mddev_lock(mddev
);
3932 if (mddev
->pers
== NULL
) {
3933 strncpy(mddev
->clevel
, buf
, slen
);
3934 if (mddev
->clevel
[slen
-1] == '\n')
3936 mddev
->clevel
[slen
] = 0;
3937 mddev
->level
= LEVEL_NONE
;
3945 /* request to change the personality. Need to ensure:
3946 * - array is not engaged in resync/recovery/reshape
3947 * - old personality can be suspended
3948 * - new personality will access other array.
3952 if (mddev
->sync_thread
||
3953 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
3954 mddev
->reshape_position
!= MaxSector
||
3955 mddev
->sysfs_active
)
3959 if (!mddev
->pers
->quiesce
) {
3960 pr_warn("md: %s: %s does not support online personality change\n",
3961 mdname(mddev
), mddev
->pers
->name
);
3965 /* Now find the new personality */
3966 strncpy(clevel
, buf
, slen
);
3967 if (clevel
[slen
-1] == '\n')
3970 if (kstrtol(clevel
, 10, &level
))
3973 if (request_module("md-%s", clevel
) != 0)
3974 request_module("md-level-%s", clevel
);
3975 spin_lock(&pers_lock
);
3976 pers
= find_pers(level
, clevel
);
3977 if (!pers
|| !try_module_get(pers
->owner
)) {
3978 spin_unlock(&pers_lock
);
3979 pr_warn("md: personality %s not loaded\n", clevel
);
3983 spin_unlock(&pers_lock
);
3985 if (pers
== mddev
->pers
) {
3986 /* Nothing to do! */
3987 module_put(pers
->owner
);
3991 if (!pers
->takeover
) {
3992 module_put(pers
->owner
);
3993 pr_warn("md: %s: %s does not support personality takeover\n",
3994 mdname(mddev
), clevel
);
3999 rdev_for_each(rdev
, mddev
)
4000 rdev
->new_raid_disk
= rdev
->raid_disk
;
4002 /* ->takeover must set new_* and/or delta_disks
4003 * if it succeeds, and may set them when it fails.
4005 priv
= pers
->takeover(mddev
);
4007 mddev
->new_level
= mddev
->level
;
4008 mddev
->new_layout
= mddev
->layout
;
4009 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
4010 mddev
->raid_disks
-= mddev
->delta_disks
;
4011 mddev
->delta_disks
= 0;
4012 mddev
->reshape_backwards
= 0;
4013 module_put(pers
->owner
);
4014 pr_warn("md: %s: %s would not accept array\n",
4015 mdname(mddev
), clevel
);
4020 /* Looks like we have a winner */
4021 mddev_suspend(mddev
);
4022 mddev_detach(mddev
);
4024 spin_lock(&mddev
->lock
);
4025 oldpers
= mddev
->pers
;
4026 oldpriv
= mddev
->private;
4028 mddev
->private = priv
;
4029 strscpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
4030 mddev
->level
= mddev
->new_level
;
4031 mddev
->layout
= mddev
->new_layout
;
4032 mddev
->chunk_sectors
= mddev
->new_chunk_sectors
;
4033 mddev
->delta_disks
= 0;
4034 mddev
->reshape_backwards
= 0;
4035 mddev
->degraded
= 0;
4036 spin_unlock(&mddev
->lock
);
4038 if (oldpers
->sync_request
== NULL
&&
4040 /* We are converting from a no-redundancy array
4041 * to a redundancy array and metadata is managed
4042 * externally so we need to be sure that writes
4043 * won't block due to a need to transition
4045 * until external management is started.
4048 mddev
->safemode_delay
= 0;
4049 mddev
->safemode
= 0;
4052 oldpers
->free(mddev
, oldpriv
);
4054 if (oldpers
->sync_request
== NULL
&&
4055 pers
->sync_request
!= NULL
) {
4056 /* need to add the md_redundancy_group */
4057 if (sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
4058 pr_warn("md: cannot register extra attributes for %s\n",
4060 mddev
->sysfs_action
= sysfs_get_dirent(mddev
->kobj
.sd
, "sync_action");
4061 mddev
->sysfs_completed
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "sync_completed");
4062 mddev
->sysfs_degraded
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "degraded");
4064 if (oldpers
->sync_request
!= NULL
&&
4065 pers
->sync_request
== NULL
) {
4066 /* need to remove the md_redundancy_group */
4067 if (mddev
->to_remove
== NULL
)
4068 mddev
->to_remove
= &md_redundancy_group
;
4071 module_put(oldpers
->owner
);
4073 rdev_for_each(rdev
, mddev
) {
4074 if (rdev
->raid_disk
< 0)
4076 if (rdev
->new_raid_disk
>= mddev
->raid_disks
)
4077 rdev
->new_raid_disk
= -1;
4078 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
4080 sysfs_unlink_rdev(mddev
, rdev
);
4082 rdev_for_each(rdev
, mddev
) {
4083 if (rdev
->raid_disk
< 0)
4085 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
4087 rdev
->raid_disk
= rdev
->new_raid_disk
;
4088 if (rdev
->raid_disk
< 0)
4089 clear_bit(In_sync
, &rdev
->flags
);
4091 if (sysfs_link_rdev(mddev
, rdev
))
4092 pr_warn("md: cannot register rd%d for %s after level change\n",
4093 rdev
->raid_disk
, mdname(mddev
));
4097 if (pers
->sync_request
== NULL
) {
4098 /* this is now an array without redundancy, so
4099 * it must always be in_sync
4102 del_timer_sync(&mddev
->safemode_timer
);
4104 blk_set_stacking_limits(&mddev
->queue
->limits
);
4106 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
4107 mddev_resume(mddev
);
4109 md_update_sb(mddev
, 1);
4110 sysfs_notify_dirent_safe(mddev
->sysfs_level
);
4114 mddev_unlock(mddev
);
4118 static struct md_sysfs_entry md_level
=
4119 __ATTR(level
, S_IRUGO
|S_IWUSR
, level_show
, level_store
);
4122 layout_show(struct mddev
*mddev
, char *page
)
4124 /* just a number, not meaningful for all levels */
4125 if (mddev
->reshape_position
!= MaxSector
&&
4126 mddev
->layout
!= mddev
->new_layout
)
4127 return sprintf(page
, "%d (%d)\n",
4128 mddev
->new_layout
, mddev
->layout
);
4129 return sprintf(page
, "%d\n", mddev
->layout
);
4133 layout_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4138 err
= kstrtouint(buf
, 10, &n
);
4141 err
= mddev_lock(mddev
);
4146 if (mddev
->pers
->check_reshape
== NULL
)
4151 mddev
->new_layout
= n
;
4152 err
= mddev
->pers
->check_reshape(mddev
);
4154 mddev
->new_layout
= mddev
->layout
;
4157 mddev
->new_layout
= n
;
4158 if (mddev
->reshape_position
== MaxSector
)
4161 mddev_unlock(mddev
);
4164 static struct md_sysfs_entry md_layout
=
4165 __ATTR(layout
, S_IRUGO
|S_IWUSR
, layout_show
, layout_store
);
4168 raid_disks_show(struct mddev
*mddev
, char *page
)
4170 if (mddev
->raid_disks
== 0)
4172 if (mddev
->reshape_position
!= MaxSector
&&
4173 mddev
->delta_disks
!= 0)
4174 return sprintf(page
, "%d (%d)\n", mddev
->raid_disks
,
4175 mddev
->raid_disks
- mddev
->delta_disks
);
4176 return sprintf(page
, "%d\n", mddev
->raid_disks
);
4179 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
);
4182 raid_disks_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4187 err
= kstrtouint(buf
, 10, &n
);
4191 err
= mddev_lock(mddev
);
4195 err
= update_raid_disks(mddev
, n
);
4196 else if (mddev
->reshape_position
!= MaxSector
) {
4197 struct md_rdev
*rdev
;
4198 int olddisks
= mddev
->raid_disks
- mddev
->delta_disks
;
4201 rdev_for_each(rdev
, mddev
) {
4203 rdev
->data_offset
< rdev
->new_data_offset
)
4206 rdev
->data_offset
> rdev
->new_data_offset
)
4210 mddev
->delta_disks
= n
- olddisks
;
4211 mddev
->raid_disks
= n
;
4212 mddev
->reshape_backwards
= (mddev
->delta_disks
< 0);
4214 mddev
->raid_disks
= n
;
4216 mddev_unlock(mddev
);
4217 return err
? err
: len
;
4219 static struct md_sysfs_entry md_raid_disks
=
4220 __ATTR(raid_disks
, S_IRUGO
|S_IWUSR
, raid_disks_show
, raid_disks_store
);
4223 uuid_show(struct mddev
*mddev
, char *page
)
4225 return sprintf(page
, "%pU\n", mddev
->uuid
);
4227 static struct md_sysfs_entry md_uuid
=
4228 __ATTR(uuid
, S_IRUGO
, uuid_show
, NULL
);
4231 chunk_size_show(struct mddev
*mddev
, char *page
)
4233 if (mddev
->reshape_position
!= MaxSector
&&
4234 mddev
->chunk_sectors
!= mddev
->new_chunk_sectors
)
4235 return sprintf(page
, "%d (%d)\n",
4236 mddev
->new_chunk_sectors
<< 9,
4237 mddev
->chunk_sectors
<< 9);
4238 return sprintf(page
, "%d\n", mddev
->chunk_sectors
<< 9);
4242 chunk_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4247 err
= kstrtoul(buf
, 10, &n
);
4251 err
= mddev_lock(mddev
);
4255 if (mddev
->pers
->check_reshape
== NULL
)
4260 mddev
->new_chunk_sectors
= n
>> 9;
4261 err
= mddev
->pers
->check_reshape(mddev
);
4263 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
4266 mddev
->new_chunk_sectors
= n
>> 9;
4267 if (mddev
->reshape_position
== MaxSector
)
4268 mddev
->chunk_sectors
= n
>> 9;
4270 mddev_unlock(mddev
);
4273 static struct md_sysfs_entry md_chunk_size
=
4274 __ATTR(chunk_size
, S_IRUGO
|S_IWUSR
, chunk_size_show
, chunk_size_store
);
4277 resync_start_show(struct mddev
*mddev
, char *page
)
4279 if (mddev
->recovery_cp
== MaxSector
)
4280 return sprintf(page
, "none\n");
4281 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->recovery_cp
);
4285 resync_start_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4287 unsigned long long n
;
4290 if (cmd_match(buf
, "none"))
4293 err
= kstrtoull(buf
, 10, &n
);
4296 if (n
!= (sector_t
)n
)
4300 err
= mddev_lock(mddev
);
4303 if (mddev
->pers
&& !test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
4307 mddev
->recovery_cp
= n
;
4309 set_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
4311 mddev_unlock(mddev
);
4314 static struct md_sysfs_entry md_resync_start
=
4315 __ATTR_PREALLOC(resync_start
, S_IRUGO
|S_IWUSR
,
4316 resync_start_show
, resync_start_store
);
4319 * The array state can be:
4322 * No devices, no size, no level
4323 * Equivalent to STOP_ARRAY ioctl
4325 * May have some settings, but array is not active
4326 * all IO results in error
4327 * When written, doesn't tear down array, but just stops it
4328 * suspended (not supported yet)
4329 * All IO requests will block. The array can be reconfigured.
4330 * Writing this, if accepted, will block until array is quiescent
4332 * no resync can happen. no superblocks get written.
4333 * write requests fail
4335 * like readonly, but behaves like 'clean' on a write request.
4337 * clean - no pending writes, but otherwise active.
4338 * When written to inactive array, starts without resync
4339 * If a write request arrives then
4340 * if metadata is known, mark 'dirty' and switch to 'active'.
4341 * if not known, block and switch to write-pending
4342 * If written to an active array that has pending writes, then fails.
4344 * fully active: IO and resync can be happening.
4345 * When written to inactive array, starts with resync
4348 * clean, but writes are blocked waiting for 'active' to be written.
4351 * like active, but no writes have been seen for a while (100msec).
4354 * Array is failed. It's useful because mounted-arrays aren't stopped
4355 * when array is failed, so this state will at least alert the user that
4356 * something is wrong.
4358 enum array_state
{ clear
, inactive
, suspended
, readonly
, read_auto
, clean
, active
,
4359 write_pending
, active_idle
, broken
, bad_word
};
4360 static char *array_states
[] = {
4361 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
4362 "write-pending", "active-idle", "broken", NULL
};
4364 static int match_word(const char *word
, char **list
)
4367 for (n
=0; list
[n
]; n
++)
4368 if (cmd_match(word
, list
[n
]))
4374 array_state_show(struct mddev
*mddev
, char *page
)
4376 enum array_state st
= inactive
;
4378 if (mddev
->pers
&& !test_bit(MD_NOT_READY
, &mddev
->flags
)) {
4387 spin_lock(&mddev
->lock
);
4388 if (test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
))
4390 else if (mddev
->in_sync
)
4392 else if (mddev
->safemode
)
4396 spin_unlock(&mddev
->lock
);
4399 if (test_bit(MD_BROKEN
, &mddev
->flags
) && st
== clean
)
4402 if (list_empty(&mddev
->disks
) &&
4403 mddev
->raid_disks
== 0 &&
4404 mddev
->dev_sectors
== 0)
4409 return sprintf(page
, "%s\n", array_states
[st
]);
4412 static int do_md_stop(struct mddev
*mddev
, int ro
, struct block_device
*bdev
);
4413 static int md_set_readonly(struct mddev
*mddev
, struct block_device
*bdev
);
4414 static int restart_array(struct mddev
*mddev
);
4417 array_state_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4420 enum array_state st
= match_word(buf
, array_states
);
4422 if (mddev
->pers
&& (st
== active
|| st
== clean
) && mddev
->ro
!= 1) {
4423 /* don't take reconfig_mutex when toggling between
4426 spin_lock(&mddev
->lock
);
4428 restart_array(mddev
);
4429 clear_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
4430 md_wakeup_thread(mddev
->thread
);
4431 wake_up(&mddev
->sb_wait
);
4432 } else /* st == clean */ {
4433 restart_array(mddev
);
4434 if (!set_in_sync(mddev
))
4438 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4439 spin_unlock(&mddev
->lock
);
4442 err
= mddev_lock(mddev
);
4450 /* stopping an active array */
4451 err
= do_md_stop(mddev
, 0, NULL
);
4454 /* stopping an active array */
4456 err
= do_md_stop(mddev
, 2, NULL
);
4458 err
= 0; /* already inactive */
4461 break; /* not supported yet */
4464 err
= md_set_readonly(mddev
, NULL
);
4467 set_disk_ro(mddev
->gendisk
, 1);
4468 err
= do_md_run(mddev
);
4474 err
= md_set_readonly(mddev
, NULL
);
4475 else if (mddev
->ro
== 1)
4476 err
= restart_array(mddev
);
4479 set_disk_ro(mddev
->gendisk
, 0);
4483 err
= do_md_run(mddev
);
4488 err
= restart_array(mddev
);
4491 spin_lock(&mddev
->lock
);
4492 if (!set_in_sync(mddev
))
4494 spin_unlock(&mddev
->lock
);
4500 err
= restart_array(mddev
);
4503 clear_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
4504 wake_up(&mddev
->sb_wait
);
4508 set_disk_ro(mddev
->gendisk
, 0);
4509 err
= do_md_run(mddev
);
4515 /* these cannot be set */
4520 if (mddev
->hold_active
== UNTIL_IOCTL
)
4521 mddev
->hold_active
= 0;
4522 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4524 mddev_unlock(mddev
);
4527 static struct md_sysfs_entry md_array_state
=
4528 __ATTR_PREALLOC(array_state
, S_IRUGO
|S_IWUSR
, array_state_show
, array_state_store
);
4531 max_corrected_read_errors_show(struct mddev
*mddev
, char *page
) {
4532 return sprintf(page
, "%d\n",
4533 atomic_read(&mddev
->max_corr_read_errors
));
4537 max_corrected_read_errors_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4542 rv
= kstrtouint(buf
, 10, &n
);
4545 atomic_set(&mddev
->max_corr_read_errors
, n
);
4549 static struct md_sysfs_entry max_corr_read_errors
=
4550 __ATTR(max_read_errors
, S_IRUGO
|S_IWUSR
, max_corrected_read_errors_show
,
4551 max_corrected_read_errors_store
);
4554 null_show(struct mddev
*mddev
, char *page
)
4559 /* need to ensure rdev_delayed_delete() has completed */
4560 static void flush_rdev_wq(struct mddev
*mddev
)
4562 struct md_rdev
*rdev
;
4565 rdev_for_each_rcu(rdev
, mddev
)
4566 if (work_pending(&rdev
->del_work
)) {
4567 flush_workqueue(md_rdev_misc_wq
);
4574 new_dev_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4576 /* buf must be %d:%d\n? giving major and minor numbers */
4577 /* The new device is added to the array.
4578 * If the array has a persistent superblock, we read the
4579 * superblock to initialise info and check validity.
4580 * Otherwise, only checking done is that in bind_rdev_to_array,
4581 * which mainly checks size.
4584 int major
= simple_strtoul(buf
, &e
, 10);
4587 struct md_rdev
*rdev
;
4590 if (!*buf
|| *e
!= ':' || !e
[1] || e
[1] == '\n')
4592 minor
= simple_strtoul(e
+1, &e
, 10);
4593 if (*e
&& *e
!= '\n')
4595 dev
= MKDEV(major
, minor
);
4596 if (major
!= MAJOR(dev
) ||
4597 minor
!= MINOR(dev
))
4600 flush_rdev_wq(mddev
);
4601 err
= mddev_lock(mddev
);
4604 if (mddev
->persistent
) {
4605 rdev
= md_import_device(dev
, mddev
->major_version
,
4606 mddev
->minor_version
);
4607 if (!IS_ERR(rdev
) && !list_empty(&mddev
->disks
)) {
4608 struct md_rdev
*rdev0
4609 = list_entry(mddev
->disks
.next
,
4610 struct md_rdev
, same_set
);
4611 err
= super_types
[mddev
->major_version
]
4612 .load_super(rdev
, rdev0
, mddev
->minor_version
);
4616 } else if (mddev
->external
)
4617 rdev
= md_import_device(dev
, -2, -1);
4619 rdev
= md_import_device(dev
, -1, -1);
4622 mddev_unlock(mddev
);
4623 return PTR_ERR(rdev
);
4625 err
= bind_rdev_to_array(rdev
, mddev
);
4629 mddev_unlock(mddev
);
4632 return err
? err
: len
;
4635 static struct md_sysfs_entry md_new_device
=
4636 __ATTR(new_dev
, S_IWUSR
, null_show
, new_dev_store
);
4639 bitmap_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4642 unsigned long chunk
, end_chunk
;
4645 err
= mddev_lock(mddev
);
4650 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
4652 chunk
= end_chunk
= simple_strtoul(buf
, &end
, 0);
4653 if (buf
== end
) break;
4654 if (*end
== '-') { /* range */
4656 end_chunk
= simple_strtoul(buf
, &end
, 0);
4657 if (buf
== end
) break;
4659 if (*end
&& !isspace(*end
)) break;
4660 md_bitmap_dirty_bits(mddev
->bitmap
, chunk
, end_chunk
);
4661 buf
= skip_spaces(end
);
4663 md_bitmap_unplug(mddev
->bitmap
); /* flush the bits to disk */
4665 mddev_unlock(mddev
);
4669 static struct md_sysfs_entry md_bitmap
=
4670 __ATTR(bitmap_set_bits
, S_IWUSR
, null_show
, bitmap_store
);
4673 size_show(struct mddev
*mddev
, char *page
)
4675 return sprintf(page
, "%llu\n",
4676 (unsigned long long)mddev
->dev_sectors
/ 2);
4679 static int update_size(struct mddev
*mddev
, sector_t num_sectors
);
4682 size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4684 /* If array is inactive, we can reduce the component size, but
4685 * not increase it (except from 0).
4686 * If array is active, we can try an on-line resize
4689 int err
= strict_blocks_to_sectors(buf
, §ors
);
4693 err
= mddev_lock(mddev
);
4697 err
= update_size(mddev
, sectors
);
4699 md_update_sb(mddev
, 1);
4701 if (mddev
->dev_sectors
== 0 ||
4702 mddev
->dev_sectors
> sectors
)
4703 mddev
->dev_sectors
= sectors
;
4707 mddev_unlock(mddev
);
4708 return err
? err
: len
;
4711 static struct md_sysfs_entry md_size
=
4712 __ATTR(component_size
, S_IRUGO
|S_IWUSR
, size_show
, size_store
);
4714 /* Metadata version.
4716 * 'none' for arrays with no metadata (good luck...)
4717 * 'external' for arrays with externally managed metadata,
4718 * or N.M for internally known formats
4721 metadata_show(struct mddev
*mddev
, char *page
)
4723 if (mddev
->persistent
)
4724 return sprintf(page
, "%d.%d\n",
4725 mddev
->major_version
, mddev
->minor_version
);
4726 else if (mddev
->external
)
4727 return sprintf(page
, "external:%s\n", mddev
->metadata_type
);
4729 return sprintf(page
, "none\n");
4733 metadata_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4738 /* Changing the details of 'external' metadata is
4739 * always permitted. Otherwise there must be
4740 * no devices attached to the array.
4743 err
= mddev_lock(mddev
);
4747 if (mddev
->external
&& strncmp(buf
, "external:", 9) == 0)
4749 else if (!list_empty(&mddev
->disks
))
4753 if (cmd_match(buf
, "none")) {
4754 mddev
->persistent
= 0;
4755 mddev
->external
= 0;
4756 mddev
->major_version
= 0;
4757 mddev
->minor_version
= 90;
4760 if (strncmp(buf
, "external:", 9) == 0) {
4761 size_t namelen
= len
-9;
4762 if (namelen
>= sizeof(mddev
->metadata_type
))
4763 namelen
= sizeof(mddev
->metadata_type
)-1;
4764 strncpy(mddev
->metadata_type
, buf
+9, namelen
);
4765 mddev
->metadata_type
[namelen
] = 0;
4766 if (namelen
&& mddev
->metadata_type
[namelen
-1] == '\n')
4767 mddev
->metadata_type
[--namelen
] = 0;
4768 mddev
->persistent
= 0;
4769 mddev
->external
= 1;
4770 mddev
->major_version
= 0;
4771 mddev
->minor_version
= 90;
4774 major
= simple_strtoul(buf
, &e
, 10);
4776 if (e
==buf
|| *e
!= '.')
4779 minor
= simple_strtoul(buf
, &e
, 10);
4780 if (e
==buf
|| (*e
&& *e
!= '\n') )
4783 if (major
>= ARRAY_SIZE(super_types
) || super_types
[major
].name
== NULL
)
4785 mddev
->major_version
= major
;
4786 mddev
->minor_version
= minor
;
4787 mddev
->persistent
= 1;
4788 mddev
->external
= 0;
4791 mddev_unlock(mddev
);
4795 static struct md_sysfs_entry md_metadata
=
4796 __ATTR_PREALLOC(metadata_version
, S_IRUGO
|S_IWUSR
, metadata_show
, metadata_store
);
4799 action_show(struct mddev
*mddev
, char *page
)
4801 char *type
= "idle";
4802 unsigned long recovery
= mddev
->recovery
;
4803 if (test_bit(MD_RECOVERY_FROZEN
, &recovery
))
4805 else if (test_bit(MD_RECOVERY_RUNNING
, &recovery
) ||
4806 (!mddev
->ro
&& test_bit(MD_RECOVERY_NEEDED
, &recovery
))) {
4807 if (test_bit(MD_RECOVERY_RESHAPE
, &recovery
))
4809 else if (test_bit(MD_RECOVERY_SYNC
, &recovery
)) {
4810 if (!test_bit(MD_RECOVERY_REQUESTED
, &recovery
))
4812 else if (test_bit(MD_RECOVERY_CHECK
, &recovery
))
4816 } else if (test_bit(MD_RECOVERY_RECOVER
, &recovery
))
4818 else if (mddev
->reshape_position
!= MaxSector
)
4821 return sprintf(page
, "%s\n", type
);
4825 action_store(struct mddev
*mddev
, const char *page
, size_t len
)
4827 if (!mddev
->pers
|| !mddev
->pers
->sync_request
)
4831 if (cmd_match(page
, "idle") || cmd_match(page
, "frozen")) {
4832 if (cmd_match(page
, "frozen"))
4833 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4835 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4836 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
4837 mddev_lock(mddev
) == 0) {
4838 if (work_pending(&mddev
->del_work
))
4839 flush_workqueue(md_misc_wq
);
4840 if (mddev
->sync_thread
) {
4841 sector_t save_rp
= mddev
->reshape_position
;
4843 mddev_unlock(mddev
);
4844 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4845 md_unregister_thread(&mddev
->sync_thread
);
4846 mddev_lock_nointr(mddev
);
4848 * set RECOVERY_INTR again and restore reshape
4849 * position in case others changed them after
4850 * got lock, eg, reshape_position_store and
4851 * md_check_recovery.
4853 mddev
->reshape_position
= save_rp
;
4854 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4855 md_reap_sync_thread(mddev
);
4857 mddev_unlock(mddev
);
4859 } else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4861 else if (cmd_match(page
, "resync"))
4862 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4863 else if (cmd_match(page
, "recover")) {
4864 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4865 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
4866 } else if (cmd_match(page
, "reshape")) {
4868 if (mddev
->pers
->start_reshape
== NULL
)
4870 err
= mddev_lock(mddev
);
4872 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4875 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4876 err
= mddev
->pers
->start_reshape(mddev
);
4878 mddev_unlock(mddev
);
4882 sysfs_notify_dirent_safe(mddev
->sysfs_degraded
);
4884 if (cmd_match(page
, "check"))
4885 set_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
4886 else if (!cmd_match(page
, "repair"))
4888 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4889 set_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
4890 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
4892 if (mddev
->ro
== 2) {
4893 /* A write to sync_action is enough to justify
4894 * canceling read-auto mode
4897 md_wakeup_thread(mddev
->sync_thread
);
4899 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4900 md_wakeup_thread(mddev
->thread
);
4901 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
4905 static struct md_sysfs_entry md_scan_mode
=
4906 __ATTR_PREALLOC(sync_action
, S_IRUGO
|S_IWUSR
, action_show
, action_store
);
4909 last_sync_action_show(struct mddev
*mddev
, char *page
)
4911 return sprintf(page
, "%s\n", mddev
->last_sync_action
);
4914 static struct md_sysfs_entry md_last_scan_mode
= __ATTR_RO(last_sync_action
);
4917 mismatch_cnt_show(struct mddev
*mddev
, char *page
)
4919 return sprintf(page
, "%llu\n",
4920 (unsigned long long)
4921 atomic64_read(&mddev
->resync_mismatches
));
4924 static struct md_sysfs_entry md_mismatches
= __ATTR_RO(mismatch_cnt
);
4927 sync_min_show(struct mddev
*mddev
, char *page
)
4929 return sprintf(page
, "%d (%s)\n", speed_min(mddev
),
4930 mddev
->sync_speed_min
? "local": "system");
4934 sync_min_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4939 if (strncmp(buf
, "system", 6)==0) {
4942 rv
= kstrtouint(buf
, 10, &min
);
4948 mddev
->sync_speed_min
= min
;
4952 static struct md_sysfs_entry md_sync_min
=
4953 __ATTR(sync_speed_min
, S_IRUGO
|S_IWUSR
, sync_min_show
, sync_min_store
);
4956 sync_max_show(struct mddev
*mddev
, char *page
)
4958 return sprintf(page
, "%d (%s)\n", speed_max(mddev
),
4959 mddev
->sync_speed_max
? "local": "system");
4963 sync_max_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4968 if (strncmp(buf
, "system", 6)==0) {
4971 rv
= kstrtouint(buf
, 10, &max
);
4977 mddev
->sync_speed_max
= max
;
4981 static struct md_sysfs_entry md_sync_max
=
4982 __ATTR(sync_speed_max
, S_IRUGO
|S_IWUSR
, sync_max_show
, sync_max_store
);
4985 degraded_show(struct mddev
*mddev
, char *page
)
4987 return sprintf(page
, "%d\n", mddev
->degraded
);
4989 static struct md_sysfs_entry md_degraded
= __ATTR_RO(degraded
);
4992 sync_force_parallel_show(struct mddev
*mddev
, char *page
)
4994 return sprintf(page
, "%d\n", mddev
->parallel_resync
);
4998 sync_force_parallel_store(struct mddev
*mddev
, const char *buf
, size_t len
)
5002 if (kstrtol(buf
, 10, &n
))
5005 if (n
!= 0 && n
!= 1)
5008 mddev
->parallel_resync
= n
;
5010 if (mddev
->sync_thread
)
5011 wake_up(&resync_wait
);
5016 /* force parallel resync, even with shared block devices */
5017 static struct md_sysfs_entry md_sync_force_parallel
=
5018 __ATTR(sync_force_parallel
, S_IRUGO
|S_IWUSR
,
5019 sync_force_parallel_show
, sync_force_parallel_store
);
5022 sync_speed_show(struct mddev
*mddev
, char *page
)
5024 unsigned long resync
, dt
, db
;
5025 if (mddev
->curr_resync
== MD_RESYNC_NONE
)
5026 return sprintf(page
, "none\n");
5027 resync
= mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
);
5028 dt
= (jiffies
- mddev
->resync_mark
) / HZ
;
5030 db
= resync
- mddev
->resync_mark_cnt
;
5031 return sprintf(page
, "%lu\n", db
/dt
/2); /* K/sec */
5034 static struct md_sysfs_entry md_sync_speed
= __ATTR_RO(sync_speed
);
5037 sync_completed_show(struct mddev
*mddev
, char *page
)
5039 unsigned long long max_sectors
, resync
;
5041 if (!test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
5042 return sprintf(page
, "none\n");
5044 if (mddev
->curr_resync
== MD_RESYNC_YIELDED
||
5045 mddev
->curr_resync
== MD_RESYNC_DELAYED
)
5046 return sprintf(page
, "delayed\n");
5048 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
5049 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
5050 max_sectors
= mddev
->resync_max_sectors
;
5052 max_sectors
= mddev
->dev_sectors
;
5054 resync
= mddev
->curr_resync_completed
;
5055 return sprintf(page
, "%llu / %llu\n", resync
, max_sectors
);
5058 static struct md_sysfs_entry md_sync_completed
=
5059 __ATTR_PREALLOC(sync_completed
, S_IRUGO
, sync_completed_show
, NULL
);
5062 min_sync_show(struct mddev
*mddev
, char *page
)
5064 return sprintf(page
, "%llu\n",
5065 (unsigned long long)mddev
->resync_min
);
5068 min_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
5070 unsigned long long min
;
5073 if (kstrtoull(buf
, 10, &min
))
5076 spin_lock(&mddev
->lock
);
5078 if (min
> mddev
->resync_max
)
5082 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
5085 /* Round down to multiple of 4K for safety */
5086 mddev
->resync_min
= round_down(min
, 8);
5090 spin_unlock(&mddev
->lock
);
5094 static struct md_sysfs_entry md_min_sync
=
5095 __ATTR(sync_min
, S_IRUGO
|S_IWUSR
, min_sync_show
, min_sync_store
);
5098 max_sync_show(struct mddev
*mddev
, char *page
)
5100 if (mddev
->resync_max
== MaxSector
)
5101 return sprintf(page
, "max\n");
5103 return sprintf(page
, "%llu\n",
5104 (unsigned long long)mddev
->resync_max
);
5107 max_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
5110 spin_lock(&mddev
->lock
);
5111 if (strncmp(buf
, "max", 3) == 0)
5112 mddev
->resync_max
= MaxSector
;
5114 unsigned long long max
;
5118 if (kstrtoull(buf
, 10, &max
))
5120 if (max
< mddev
->resync_min
)
5124 if (max
< mddev
->resync_max
&&
5126 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
5129 /* Must be a multiple of chunk_size */
5130 chunk
= mddev
->chunk_sectors
;
5132 sector_t temp
= max
;
5135 if (sector_div(temp
, chunk
))
5138 mddev
->resync_max
= max
;
5140 wake_up(&mddev
->recovery_wait
);
5143 spin_unlock(&mddev
->lock
);
5147 static struct md_sysfs_entry md_max_sync
=
5148 __ATTR(sync_max
, S_IRUGO
|S_IWUSR
, max_sync_show
, max_sync_store
);
5151 suspend_lo_show(struct mddev
*mddev
, char *page
)
5153 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_lo
);
5157 suspend_lo_store(struct mddev
*mddev
, const char *buf
, size_t len
)
5159 unsigned long long new;
5162 err
= kstrtoull(buf
, 10, &new);
5165 if (new != (sector_t
)new)
5168 err
= mddev_lock(mddev
);
5172 if (mddev
->pers
== NULL
||
5173 mddev
->pers
->quiesce
== NULL
)
5175 mddev_suspend(mddev
);
5176 mddev
->suspend_lo
= new;
5177 mddev_resume(mddev
);
5181 mddev_unlock(mddev
);
5184 static struct md_sysfs_entry md_suspend_lo
=
5185 __ATTR(suspend_lo
, S_IRUGO
|S_IWUSR
, suspend_lo_show
, suspend_lo_store
);
5188 suspend_hi_show(struct mddev
*mddev
, char *page
)
5190 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_hi
);
5194 suspend_hi_store(struct mddev
*mddev
, const char *buf
, size_t len
)
5196 unsigned long long new;
5199 err
= kstrtoull(buf
, 10, &new);
5202 if (new != (sector_t
)new)
5205 err
= mddev_lock(mddev
);
5209 if (mddev
->pers
== NULL
)
5212 mddev_suspend(mddev
);
5213 mddev
->suspend_hi
= new;
5214 mddev_resume(mddev
);
5218 mddev_unlock(mddev
);
5221 static struct md_sysfs_entry md_suspend_hi
=
5222 __ATTR(suspend_hi
, S_IRUGO
|S_IWUSR
, suspend_hi_show
, suspend_hi_store
);
5225 reshape_position_show(struct mddev
*mddev
, char *page
)
5227 if (mddev
->reshape_position
!= MaxSector
)
5228 return sprintf(page
, "%llu\n",
5229 (unsigned long long)mddev
->reshape_position
);
5230 strcpy(page
, "none\n");
5235 reshape_position_store(struct mddev
*mddev
, const char *buf
, size_t len
)
5237 struct md_rdev
*rdev
;
5238 unsigned long long new;
5241 err
= kstrtoull(buf
, 10, &new);
5244 if (new != (sector_t
)new)
5246 err
= mddev_lock(mddev
);
5252 mddev
->reshape_position
= new;
5253 mddev
->delta_disks
= 0;
5254 mddev
->reshape_backwards
= 0;
5255 mddev
->new_level
= mddev
->level
;
5256 mddev
->new_layout
= mddev
->layout
;
5257 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
5258 rdev_for_each(rdev
, mddev
)
5259 rdev
->new_data_offset
= rdev
->data_offset
;
5262 mddev_unlock(mddev
);
5266 static struct md_sysfs_entry md_reshape_position
=
5267 __ATTR(reshape_position
, S_IRUGO
|S_IWUSR
, reshape_position_show
,
5268 reshape_position_store
);
5271 reshape_direction_show(struct mddev
*mddev
, char *page
)
5273 return sprintf(page
, "%s\n",
5274 mddev
->reshape_backwards
? "backwards" : "forwards");
5278 reshape_direction_store(struct mddev
*mddev
, const char *buf
, size_t len
)
5283 if (cmd_match(buf
, "forwards"))
5285 else if (cmd_match(buf
, "backwards"))
5289 if (mddev
->reshape_backwards
== backwards
)
5292 err
= mddev_lock(mddev
);
5295 /* check if we are allowed to change */
5296 if (mddev
->delta_disks
)
5298 else if (mddev
->persistent
&&
5299 mddev
->major_version
== 0)
5302 mddev
->reshape_backwards
= backwards
;
5303 mddev_unlock(mddev
);
5307 static struct md_sysfs_entry md_reshape_direction
=
5308 __ATTR(reshape_direction
, S_IRUGO
|S_IWUSR
, reshape_direction_show
,
5309 reshape_direction_store
);
5312 array_size_show(struct mddev
*mddev
, char *page
)
5314 if (mddev
->external_size
)
5315 return sprintf(page
, "%llu\n",
5316 (unsigned long long)mddev
->array_sectors
/2);
5318 return sprintf(page
, "default\n");
5322 array_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
5327 err
= mddev_lock(mddev
);
5331 /* cluster raid doesn't support change array_sectors */
5332 if (mddev_is_clustered(mddev
)) {
5333 mddev_unlock(mddev
);
5337 if (strncmp(buf
, "default", 7) == 0) {
5339 sectors
= mddev
->pers
->size(mddev
, 0, 0);
5341 sectors
= mddev
->array_sectors
;
5343 mddev
->external_size
= 0;
5345 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
5347 else if (mddev
->pers
&& mddev
->pers
->size(mddev
, 0, 0) < sectors
)
5350 mddev
->external_size
= 1;
5354 mddev
->array_sectors
= sectors
;
5356 set_capacity_and_notify(mddev
->gendisk
,
5357 mddev
->array_sectors
);
5359 mddev_unlock(mddev
);
5363 static struct md_sysfs_entry md_array_size
=
5364 __ATTR(array_size
, S_IRUGO
|S_IWUSR
, array_size_show
,
5368 consistency_policy_show(struct mddev
*mddev
, char *page
)
5372 if (test_bit(MD_HAS_JOURNAL
, &mddev
->flags
)) {
5373 ret
= sprintf(page
, "journal\n");
5374 } else if (test_bit(MD_HAS_PPL
, &mddev
->flags
)) {
5375 ret
= sprintf(page
, "ppl\n");
5376 } else if (mddev
->bitmap
) {
5377 ret
= sprintf(page
, "bitmap\n");
5378 } else if (mddev
->pers
) {
5379 if (mddev
->pers
->sync_request
)
5380 ret
= sprintf(page
, "resync\n");
5382 ret
= sprintf(page
, "none\n");
5384 ret
= sprintf(page
, "unknown\n");
5391 consistency_policy_store(struct mddev
*mddev
, const char *buf
, size_t len
)
5396 if (mddev
->pers
->change_consistency_policy
)
5397 err
= mddev
->pers
->change_consistency_policy(mddev
, buf
);
5400 } else if (mddev
->external
&& strncmp(buf
, "ppl", 3) == 0) {
5401 set_bit(MD_HAS_PPL
, &mddev
->flags
);
5406 return err
? err
: len
;
5409 static struct md_sysfs_entry md_consistency_policy
=
5410 __ATTR(consistency_policy
, S_IRUGO
| S_IWUSR
, consistency_policy_show
,
5411 consistency_policy_store
);
5413 static ssize_t
fail_last_dev_show(struct mddev
*mddev
, char *page
)
5415 return sprintf(page
, "%d\n", mddev
->fail_last_dev
);
5419 * Setting fail_last_dev to true to allow last device to be forcibly removed
5420 * from RAID1/RAID10.
5423 fail_last_dev_store(struct mddev
*mddev
, const char *buf
, size_t len
)
5428 ret
= kstrtobool(buf
, &value
);
5432 if (value
!= mddev
->fail_last_dev
)
5433 mddev
->fail_last_dev
= value
;
5437 static struct md_sysfs_entry md_fail_last_dev
=
5438 __ATTR(fail_last_dev
, S_IRUGO
| S_IWUSR
, fail_last_dev_show
,
5439 fail_last_dev_store
);
5441 static ssize_t
serialize_policy_show(struct mddev
*mddev
, char *page
)
5443 if (mddev
->pers
== NULL
|| (mddev
->pers
->level
!= 1))
5444 return sprintf(page
, "n/a\n");
5446 return sprintf(page
, "%d\n", mddev
->serialize_policy
);
5450 * Setting serialize_policy to true to enforce write IO is not reordered
5454 serialize_policy_store(struct mddev
*mddev
, const char *buf
, size_t len
)
5459 err
= kstrtobool(buf
, &value
);
5463 if (value
== mddev
->serialize_policy
)
5466 err
= mddev_lock(mddev
);
5469 if (mddev
->pers
== NULL
|| (mddev
->pers
->level
!= 1)) {
5470 pr_err("md: serialize_policy is only effective for raid1\n");
5475 mddev_suspend(mddev
);
5477 mddev_create_serial_pool(mddev
, NULL
, true);
5479 mddev_destroy_serial_pool(mddev
, NULL
, true);
5480 mddev
->serialize_policy
= value
;
5481 mddev_resume(mddev
);
5483 mddev_unlock(mddev
);
5487 static struct md_sysfs_entry md_serialize_policy
=
5488 __ATTR(serialize_policy
, S_IRUGO
| S_IWUSR
, serialize_policy_show
,
5489 serialize_policy_store
);
5492 static struct attribute
*md_default_attrs
[] = {
5495 &md_raid_disks
.attr
,
5497 &md_chunk_size
.attr
,
5499 &md_resync_start
.attr
,
5501 &md_new_device
.attr
,
5502 &md_safe_delay
.attr
,
5503 &md_array_state
.attr
,
5504 &md_reshape_position
.attr
,
5505 &md_reshape_direction
.attr
,
5506 &md_array_size
.attr
,
5507 &max_corr_read_errors
.attr
,
5508 &md_consistency_policy
.attr
,
5509 &md_fail_last_dev
.attr
,
5510 &md_serialize_policy
.attr
,
5514 static const struct attribute_group md_default_group
= {
5515 .attrs
= md_default_attrs
,
5518 static struct attribute
*md_redundancy_attrs
[] = {
5520 &md_last_scan_mode
.attr
,
5521 &md_mismatches
.attr
,
5524 &md_sync_speed
.attr
,
5525 &md_sync_force_parallel
.attr
,
5526 &md_sync_completed
.attr
,
5529 &md_suspend_lo
.attr
,
5530 &md_suspend_hi
.attr
,
5535 static const struct attribute_group md_redundancy_group
= {
5537 .attrs
= md_redundancy_attrs
,
5540 static const struct attribute_group
*md_attr_groups
[] = {
5547 md_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
5549 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
5550 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
5555 spin_lock(&all_mddevs_lock
);
5556 if (list_empty(&mddev
->all_mddevs
)) {
5557 spin_unlock(&all_mddevs_lock
);
5561 spin_unlock(&all_mddevs_lock
);
5563 rv
= entry
->show(mddev
, page
);
5569 md_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
5570 const char *page
, size_t length
)
5572 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
5573 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
5578 if (!capable(CAP_SYS_ADMIN
))
5580 spin_lock(&all_mddevs_lock
);
5581 if (list_empty(&mddev
->all_mddevs
)) {
5582 spin_unlock(&all_mddevs_lock
);
5586 spin_unlock(&all_mddevs_lock
);
5587 rv
= entry
->store(mddev
, page
, length
);
5592 static void md_kobj_release(struct kobject
*ko
)
5594 struct mddev
*mddev
= container_of(ko
, struct mddev
, kobj
);
5596 if (mddev
->sysfs_state
)
5597 sysfs_put(mddev
->sysfs_state
);
5598 if (mddev
->sysfs_level
)
5599 sysfs_put(mddev
->sysfs_level
);
5601 del_gendisk(mddev
->gendisk
);
5602 put_disk(mddev
->gendisk
);
5605 static const struct sysfs_ops md_sysfs_ops
= {
5606 .show
= md_attr_show
,
5607 .store
= md_attr_store
,
5609 static struct kobj_type md_ktype
= {
5610 .release
= md_kobj_release
,
5611 .sysfs_ops
= &md_sysfs_ops
,
5612 .default_groups
= md_attr_groups
,
5617 static void mddev_delayed_delete(struct work_struct
*ws
)
5619 struct mddev
*mddev
= container_of(ws
, struct mddev
, del_work
);
5621 kobject_put(&mddev
->kobj
);
5624 static void no_op(struct percpu_ref
*r
) {}
5626 int mddev_init_writes_pending(struct mddev
*mddev
)
5628 if (mddev
->writes_pending
.percpu_count_ptr
)
5630 if (percpu_ref_init(&mddev
->writes_pending
, no_op
,
5631 PERCPU_REF_ALLOW_REINIT
, GFP_KERNEL
) < 0)
5633 /* We want to start with the refcount at zero */
5634 percpu_ref_put(&mddev
->writes_pending
);
5637 EXPORT_SYMBOL_GPL(mddev_init_writes_pending
);
5639 int md_alloc(dev_t dev
, char *name
)
5642 * If dev is zero, name is the name of a device to allocate with
5643 * an arbitrary minor number. It will be "md_???"
5644 * If dev is non-zero it must be a device number with a MAJOR of
5645 * MD_MAJOR or mdp_major. In this case, if "name" is NULL, then
5646 * the device is being created by opening a node in /dev.
5647 * If "name" is not NULL, the device is being created by
5648 * writing to /sys/module/md_mod/parameters/new_array.
5650 static DEFINE_MUTEX(disks_mutex
);
5651 struct mddev
*mddev
;
5652 struct gendisk
*disk
;
5659 * Wait for any previous instance of this device to be completely
5660 * removed (mddev_delayed_delete).
5662 flush_workqueue(md_misc_wq
);
5664 mutex_lock(&disks_mutex
);
5665 mddev
= mddev_alloc(dev
);
5666 if (IS_ERR(mddev
)) {
5667 error
= PTR_ERR(mddev
);
5671 partitioned
= (MAJOR(mddev
->unit
) != MD_MAJOR
);
5672 shift
= partitioned
? MdpMinorShift
: 0;
5673 unit
= MINOR(mddev
->unit
) >> shift
;
5676 /* Need to ensure that 'name' is not a duplicate.
5678 struct mddev
*mddev2
;
5679 spin_lock(&all_mddevs_lock
);
5681 list_for_each_entry(mddev2
, &all_mddevs
, all_mddevs
)
5682 if (mddev2
->gendisk
&&
5683 strcmp(mddev2
->gendisk
->disk_name
, name
) == 0) {
5684 spin_unlock(&all_mddevs_lock
);
5686 goto out_free_mddev
;
5688 spin_unlock(&all_mddevs_lock
);
5692 * Creating /dev/mdNNN via "newarray", so adjust hold_active.
5694 mddev
->hold_active
= UNTIL_STOP
;
5697 disk
= blk_alloc_disk(NUMA_NO_NODE
);
5699 goto out_free_mddev
;
5701 disk
->major
= MAJOR(mddev
->unit
);
5702 disk
->first_minor
= unit
<< shift
;
5703 disk
->minors
= 1 << shift
;
5705 strcpy(disk
->disk_name
, name
);
5706 else if (partitioned
)
5707 sprintf(disk
->disk_name
, "md_d%d", unit
);
5709 sprintf(disk
->disk_name
, "md%d", unit
);
5710 disk
->fops
= &md_fops
;
5711 disk
->private_data
= mddev
;
5713 mddev
->queue
= disk
->queue
;
5714 blk_set_stacking_limits(&mddev
->queue
->limits
);
5715 blk_queue_write_cache(mddev
->queue
, true, true);
5716 disk
->events
|= DISK_EVENT_MEDIA_CHANGE
;
5717 mddev
->gendisk
= disk
;
5718 error
= add_disk(disk
);
5722 kobject_init(&mddev
->kobj
, &md_ktype
);
5723 error
= kobject_add(&mddev
->kobj
, &disk_to_dev(disk
)->kobj
, "%s", "md");
5726 * The disk is already live at this point. Clear the hold flag
5727 * and let mddev_put take care of the deletion, as it isn't any
5728 * different from a normal close on last release now.
5730 mddev
->hold_active
= 0;
5734 kobject_uevent(&mddev
->kobj
, KOBJ_ADD
);
5735 mddev
->sysfs_state
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "array_state");
5736 mddev
->sysfs_level
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "level");
5739 mutex_unlock(&disks_mutex
);
5748 mutex_unlock(&disks_mutex
);
5752 static void md_probe(dev_t dev
)
5754 if (MAJOR(dev
) == MD_MAJOR
&& MINOR(dev
) >= 512)
5757 md_alloc(dev
, NULL
);
5760 static int add_named_array(const char *val
, const struct kernel_param
*kp
)
5763 * val must be "md_*" or "mdNNN".
5764 * For "md_*" we allocate an array with a large free minor number, and
5765 * set the name to val. val must not already be an active name.
5766 * For "mdNNN" we allocate an array with the minor number NNN
5767 * which must not already be in use.
5769 int len
= strlen(val
);
5770 char buf
[DISK_NAME_LEN
];
5771 unsigned long devnum
;
5773 while (len
&& val
[len
-1] == '\n')
5775 if (len
>= DISK_NAME_LEN
)
5777 strscpy(buf
, val
, len
+1);
5778 if (strncmp(buf
, "md_", 3) == 0)
5779 return md_alloc(0, buf
);
5780 if (strncmp(buf
, "md", 2) == 0 &&
5782 kstrtoul(buf
+2, 10, &devnum
) == 0 &&
5783 devnum
<= MINORMASK
)
5784 return md_alloc(MKDEV(MD_MAJOR
, devnum
), NULL
);
5789 static void md_safemode_timeout(struct timer_list
*t
)
5791 struct mddev
*mddev
= from_timer(mddev
, t
, safemode_timer
);
5793 mddev
->safemode
= 1;
5794 if (mddev
->external
)
5795 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5797 md_wakeup_thread(mddev
->thread
);
5800 static int start_dirty_degraded
;
5802 int md_run(struct mddev
*mddev
)
5805 struct md_rdev
*rdev
;
5806 struct md_personality
*pers
;
5809 if (list_empty(&mddev
->disks
))
5810 /* cannot run an array with no devices.. */
5815 /* Cannot run until previous stop completes properly */
5816 if (mddev
->sysfs_active
)
5820 * Analyze all RAID superblock(s)
5822 if (!mddev
->raid_disks
) {
5823 if (!mddev
->persistent
)
5825 err
= analyze_sbs(mddev
);
5830 if (mddev
->level
!= LEVEL_NONE
)
5831 request_module("md-level-%d", mddev
->level
);
5832 else if (mddev
->clevel
[0])
5833 request_module("md-%s", mddev
->clevel
);
5836 * Drop all container device buffers, from now on
5837 * the only valid external interface is through the md
5840 mddev
->has_superblocks
= false;
5841 rdev_for_each(rdev
, mddev
) {
5842 if (test_bit(Faulty
, &rdev
->flags
))
5844 sync_blockdev(rdev
->bdev
);
5845 invalidate_bdev(rdev
->bdev
);
5846 if (mddev
->ro
!= 1 && rdev_read_only(rdev
)) {
5849 set_disk_ro(mddev
->gendisk
, 1);
5853 mddev
->has_superblocks
= true;
5855 /* perform some consistency tests on the device.
5856 * We don't want the data to overlap the metadata,
5857 * Internal Bitmap issues have been handled elsewhere.
5859 if (rdev
->meta_bdev
) {
5860 /* Nothing to check */;
5861 } else if (rdev
->data_offset
< rdev
->sb_start
) {
5862 if (mddev
->dev_sectors
&&
5863 rdev
->data_offset
+ mddev
->dev_sectors
5865 pr_warn("md: %s: data overlaps metadata\n",
5870 if (rdev
->sb_start
+ rdev
->sb_size
/512
5871 > rdev
->data_offset
) {
5872 pr_warn("md: %s: metadata overlaps data\n",
5877 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
5878 nowait
= nowait
&& blk_queue_nowait(bdev_get_queue(rdev
->bdev
));
5881 if (!bioset_initialized(&mddev
->bio_set
)) {
5882 err
= bioset_init(&mddev
->bio_set
, BIO_POOL_SIZE
, 0, BIOSET_NEED_BVECS
);
5886 if (!bioset_initialized(&mddev
->sync_set
)) {
5887 err
= bioset_init(&mddev
->sync_set
, BIO_POOL_SIZE
, 0, BIOSET_NEED_BVECS
);
5892 spin_lock(&pers_lock
);
5893 pers
= find_pers(mddev
->level
, mddev
->clevel
);
5894 if (!pers
|| !try_module_get(pers
->owner
)) {
5895 spin_unlock(&pers_lock
);
5896 if (mddev
->level
!= LEVEL_NONE
)
5897 pr_warn("md: personality for level %d is not loaded!\n",
5900 pr_warn("md: personality for level %s is not loaded!\n",
5905 spin_unlock(&pers_lock
);
5906 if (mddev
->level
!= pers
->level
) {
5907 mddev
->level
= pers
->level
;
5908 mddev
->new_level
= pers
->level
;
5910 strscpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
5912 if (mddev
->reshape_position
!= MaxSector
&&
5913 pers
->start_reshape
== NULL
) {
5914 /* This personality cannot handle reshaping... */
5915 module_put(pers
->owner
);
5920 if (pers
->sync_request
) {
5921 /* Warn if this is a potentially silly
5924 struct md_rdev
*rdev2
;
5927 rdev_for_each(rdev
, mddev
)
5928 rdev_for_each(rdev2
, mddev
) {
5930 rdev
->bdev
->bd_disk
==
5931 rdev2
->bdev
->bd_disk
) {
5932 pr_warn("%s: WARNING: %pg appears to be on the same physical disk as %pg.\n",
5941 pr_warn("True protection against single-disk failure might be compromised.\n");
5944 mddev
->recovery
= 0;
5945 /* may be over-ridden by personality */
5946 mddev
->resync_max_sectors
= mddev
->dev_sectors
;
5948 mddev
->ok_start_degraded
= start_dirty_degraded
;
5950 if (start_readonly
&& mddev
->ro
== 0)
5951 mddev
->ro
= 2; /* read-only, but switch on first write */
5953 err
= pers
->run(mddev
);
5955 pr_warn("md: pers->run() failed ...\n");
5956 else if (pers
->size(mddev
, 0, 0) < mddev
->array_sectors
) {
5957 WARN_ONCE(!mddev
->external_size
,
5958 "%s: default size too small, but 'external_size' not in effect?\n",
5960 pr_warn("md: invalid array_size %llu > default size %llu\n",
5961 (unsigned long long)mddev
->array_sectors
/ 2,
5962 (unsigned long long)pers
->size(mddev
, 0, 0) / 2);
5965 if (err
== 0 && pers
->sync_request
&&
5966 (mddev
->bitmap_info
.file
|| mddev
->bitmap_info
.offset
)) {
5967 struct bitmap
*bitmap
;
5969 bitmap
= md_bitmap_create(mddev
, -1);
5970 if (IS_ERR(bitmap
)) {
5971 err
= PTR_ERR(bitmap
);
5972 pr_warn("%s: failed to create bitmap (%d)\n",
5973 mdname(mddev
), err
);
5975 mddev
->bitmap
= bitmap
;
5981 if (mddev
->bitmap_info
.max_write_behind
> 0) {
5982 bool create_pool
= false;
5984 rdev_for_each(rdev
, mddev
) {
5985 if (test_bit(WriteMostly
, &rdev
->flags
) &&
5986 rdev_init_serial(rdev
))
5989 if (create_pool
&& mddev
->serial_info_pool
== NULL
) {
5990 mddev
->serial_info_pool
=
5991 mempool_create_kmalloc_pool(NR_SERIAL_INFOS
,
5992 sizeof(struct serial_info
));
5993 if (!mddev
->serial_info_pool
) {
6003 rdev_for_each(rdev
, mddev
) {
6004 if (rdev
->raid_disk
>= 0 && !bdev_nonrot(rdev
->bdev
)) {
6009 if (mddev
->degraded
)
6012 blk_queue_flag_set(QUEUE_FLAG_NONROT
, mddev
->queue
);
6014 blk_queue_flag_clear(QUEUE_FLAG_NONROT
, mddev
->queue
);
6015 blk_queue_flag_set(QUEUE_FLAG_IO_STAT
, mddev
->queue
);
6017 /* Set the NOWAIT flags if all underlying devices support it */
6019 blk_queue_flag_set(QUEUE_FLAG_NOWAIT
, mddev
->queue
);
6021 if (pers
->sync_request
) {
6022 if (mddev
->kobj
.sd
&&
6023 sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
6024 pr_warn("md: cannot register extra attributes for %s\n",
6026 mddev
->sysfs_action
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "sync_action");
6027 mddev
->sysfs_completed
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "sync_completed");
6028 mddev
->sysfs_degraded
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "degraded");
6029 } else if (mddev
->ro
== 2) /* auto-readonly not meaningful */
6032 atomic_set(&mddev
->max_corr_read_errors
,
6033 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS
);
6034 mddev
->safemode
= 0;
6035 if (mddev_is_clustered(mddev
))
6036 mddev
->safemode_delay
= 0;
6038 mddev
->safemode_delay
= DEFAULT_SAFEMODE_DELAY
;
6041 spin_lock(&mddev
->lock
);
6043 spin_unlock(&mddev
->lock
);
6044 rdev_for_each(rdev
, mddev
)
6045 if (rdev
->raid_disk
>= 0)
6046 sysfs_link_rdev(mddev
, rdev
); /* failure here is OK */
6048 if (mddev
->degraded
&& !mddev
->ro
)
6049 /* This ensures that recovering status is reported immediately
6050 * via sysfs - until a lack of spares is confirmed.
6052 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
6053 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6055 if (mddev
->sb_flags
)
6056 md_update_sb(mddev
, 0);
6062 mddev_detach(mddev
);
6064 pers
->free(mddev
, mddev
->private);
6065 mddev
->private = NULL
;
6066 module_put(pers
->owner
);
6067 md_bitmap_destroy(mddev
);
6069 bioset_exit(&mddev
->sync_set
);
6071 bioset_exit(&mddev
->bio_set
);
6074 EXPORT_SYMBOL_GPL(md_run
);
6076 int do_md_run(struct mddev
*mddev
)
6080 set_bit(MD_NOT_READY
, &mddev
->flags
);
6081 err
= md_run(mddev
);
6084 err
= md_bitmap_load(mddev
);
6086 md_bitmap_destroy(mddev
);
6090 if (mddev_is_clustered(mddev
))
6091 md_allow_write(mddev
);
6093 /* run start up tasks that require md_thread */
6096 md_wakeup_thread(mddev
->thread
);
6097 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
6099 set_capacity_and_notify(mddev
->gendisk
, mddev
->array_sectors
);
6100 clear_bit(MD_NOT_READY
, &mddev
->flags
);
6102 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
6103 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6104 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
6105 sysfs_notify_dirent_safe(mddev
->sysfs_degraded
);
6107 clear_bit(MD_NOT_READY
, &mddev
->flags
);
6111 int md_start(struct mddev
*mddev
)
6115 if (mddev
->pers
->start
) {
6116 set_bit(MD_RECOVERY_WAIT
, &mddev
->recovery
);
6117 md_wakeup_thread(mddev
->thread
);
6118 ret
= mddev
->pers
->start(mddev
);
6119 clear_bit(MD_RECOVERY_WAIT
, &mddev
->recovery
);
6120 md_wakeup_thread(mddev
->sync_thread
);
6124 EXPORT_SYMBOL_GPL(md_start
);
6126 static int restart_array(struct mddev
*mddev
)
6128 struct gendisk
*disk
= mddev
->gendisk
;
6129 struct md_rdev
*rdev
;
6130 bool has_journal
= false;
6131 bool has_readonly
= false;
6133 /* Complain if it has no devices */
6134 if (list_empty(&mddev
->disks
))
6142 rdev_for_each_rcu(rdev
, mddev
) {
6143 if (test_bit(Journal
, &rdev
->flags
) &&
6144 !test_bit(Faulty
, &rdev
->flags
))
6146 if (rdev_read_only(rdev
))
6147 has_readonly
= true;
6150 if (test_bit(MD_HAS_JOURNAL
, &mddev
->flags
) && !has_journal
)
6151 /* Don't restart rw with journal missing/faulty */
6156 mddev
->safemode
= 0;
6158 set_disk_ro(disk
, 0);
6159 pr_debug("md: %s switched to read-write mode.\n", mdname(mddev
));
6160 /* Kick recovery or resync if necessary */
6161 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6162 md_wakeup_thread(mddev
->thread
);
6163 md_wakeup_thread(mddev
->sync_thread
);
6164 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6168 static void md_clean(struct mddev
*mddev
)
6170 mddev
->array_sectors
= 0;
6171 mddev
->external_size
= 0;
6172 mddev
->dev_sectors
= 0;
6173 mddev
->raid_disks
= 0;
6174 mddev
->recovery_cp
= 0;
6175 mddev
->resync_min
= 0;
6176 mddev
->resync_max
= MaxSector
;
6177 mddev
->reshape_position
= MaxSector
;
6178 mddev
->external
= 0;
6179 mddev
->persistent
= 0;
6180 mddev
->level
= LEVEL_NONE
;
6181 mddev
->clevel
[0] = 0;
6183 mddev
->sb_flags
= 0;
6185 mddev
->metadata_type
[0] = 0;
6186 mddev
->chunk_sectors
= 0;
6187 mddev
->ctime
= mddev
->utime
= 0;
6189 mddev
->max_disks
= 0;
6191 mddev
->can_decrease_events
= 0;
6192 mddev
->delta_disks
= 0;
6193 mddev
->reshape_backwards
= 0;
6194 mddev
->new_level
= LEVEL_NONE
;
6195 mddev
->new_layout
= 0;
6196 mddev
->new_chunk_sectors
= 0;
6197 mddev
->curr_resync
= 0;
6198 atomic64_set(&mddev
->resync_mismatches
, 0);
6199 mddev
->suspend_lo
= mddev
->suspend_hi
= 0;
6200 mddev
->sync_speed_min
= mddev
->sync_speed_max
= 0;
6201 mddev
->recovery
= 0;
6204 mddev
->degraded
= 0;
6205 mddev
->safemode
= 0;
6206 mddev
->private = NULL
;
6207 mddev
->cluster_info
= NULL
;
6208 mddev
->bitmap_info
.offset
= 0;
6209 mddev
->bitmap_info
.default_offset
= 0;
6210 mddev
->bitmap_info
.default_space
= 0;
6211 mddev
->bitmap_info
.chunksize
= 0;
6212 mddev
->bitmap_info
.daemon_sleep
= 0;
6213 mddev
->bitmap_info
.max_write_behind
= 0;
6214 mddev
->bitmap_info
.nodes
= 0;
6217 static void __md_stop_writes(struct mddev
*mddev
)
6219 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
6220 if (work_pending(&mddev
->del_work
))
6221 flush_workqueue(md_misc_wq
);
6222 if (mddev
->sync_thread
) {
6223 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6224 md_unregister_thread(&mddev
->sync_thread
);
6225 md_reap_sync_thread(mddev
);
6228 del_timer_sync(&mddev
->safemode_timer
);
6230 if (mddev
->pers
&& mddev
->pers
->quiesce
) {
6231 mddev
->pers
->quiesce(mddev
, 1);
6232 mddev
->pers
->quiesce(mddev
, 0);
6234 md_bitmap_flush(mddev
);
6236 if (mddev
->ro
== 0 &&
6237 ((!mddev
->in_sync
&& !mddev_is_clustered(mddev
)) ||
6239 /* mark array as shutdown cleanly */
6240 if (!mddev_is_clustered(mddev
))
6242 md_update_sb(mddev
, 1);
6244 /* disable policy to guarantee rdevs free resources for serialization */
6245 mddev
->serialize_policy
= 0;
6246 mddev_destroy_serial_pool(mddev
, NULL
, true);
6249 void md_stop_writes(struct mddev
*mddev
)
6251 mddev_lock_nointr(mddev
);
6252 __md_stop_writes(mddev
);
6253 mddev_unlock(mddev
);
6255 EXPORT_SYMBOL_GPL(md_stop_writes
);
6257 static void mddev_detach(struct mddev
*mddev
)
6259 md_bitmap_wait_behind_writes(mddev
);
6260 if (mddev
->pers
&& mddev
->pers
->quiesce
&& !mddev
->suspended
) {
6261 mddev
->pers
->quiesce(mddev
, 1);
6262 mddev
->pers
->quiesce(mddev
, 0);
6264 md_unregister_thread(&mddev
->thread
);
6266 blk_sync_queue(mddev
->queue
); /* the unplug fn references 'conf'*/
6269 static void __md_stop(struct mddev
*mddev
)
6271 struct md_personality
*pers
= mddev
->pers
;
6272 md_bitmap_destroy(mddev
);
6273 mddev_detach(mddev
);
6274 /* Ensure ->event_work is done */
6275 if (mddev
->event_work
.func
)
6276 flush_workqueue(md_misc_wq
);
6277 spin_lock(&mddev
->lock
);
6279 spin_unlock(&mddev
->lock
);
6281 pers
->free(mddev
, mddev
->private);
6282 mddev
->private = NULL
;
6283 if (pers
->sync_request
&& mddev
->to_remove
== NULL
)
6284 mddev
->to_remove
= &md_redundancy_group
;
6285 module_put(pers
->owner
);
6286 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
6289 void md_stop(struct mddev
*mddev
)
6291 /* stop the array and free an attached data structures.
6292 * This is called from dm-raid
6295 bioset_exit(&mddev
->bio_set
);
6296 bioset_exit(&mddev
->sync_set
);
6299 EXPORT_SYMBOL_GPL(md_stop
);
6301 static int md_set_readonly(struct mddev
*mddev
, struct block_device
*bdev
)
6306 if (!test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
)) {
6308 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
6309 md_wakeup_thread(mddev
->thread
);
6311 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
6312 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6313 if (mddev
->sync_thread
)
6314 /* Thread might be blocked waiting for metadata update
6315 * which will now never happen */
6316 wake_up_process(mddev
->sync_thread
->tsk
);
6318 if (mddev
->external
&& test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
))
6320 mddev_unlock(mddev
);
6321 wait_event(resync_wait
, !test_bit(MD_RECOVERY_RUNNING
,
6323 wait_event(mddev
->sb_wait
,
6324 !test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
));
6325 mddev_lock_nointr(mddev
);
6327 mutex_lock(&mddev
->open_mutex
);
6328 if ((mddev
->pers
&& atomic_read(&mddev
->openers
) > !!bdev
) ||
6329 mddev
->sync_thread
||
6330 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
)) {
6331 pr_warn("md: %s still in use.\n",mdname(mddev
));
6333 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
6334 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6335 md_wakeup_thread(mddev
->thread
);
6341 __md_stop_writes(mddev
);
6347 set_disk_ro(mddev
->gendisk
, 1);
6348 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
6349 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6350 md_wakeup_thread(mddev
->thread
);
6351 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6355 mutex_unlock(&mddev
->open_mutex
);
6360 * 0 - completely stop and dis-assemble array
6361 * 2 - stop but do not disassemble array
6363 static int do_md_stop(struct mddev
*mddev
, int mode
,
6364 struct block_device
*bdev
)
6366 struct gendisk
*disk
= mddev
->gendisk
;
6367 struct md_rdev
*rdev
;
6370 if (!test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
)) {
6372 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
6373 md_wakeup_thread(mddev
->thread
);
6375 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
6376 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6377 if (mddev
->sync_thread
)
6378 /* Thread might be blocked waiting for metadata update
6379 * which will now never happen */
6380 wake_up_process(mddev
->sync_thread
->tsk
);
6382 mddev_unlock(mddev
);
6383 wait_event(resync_wait
, (mddev
->sync_thread
== NULL
&&
6384 !test_bit(MD_RECOVERY_RUNNING
,
6385 &mddev
->recovery
)));
6386 mddev_lock_nointr(mddev
);
6388 mutex_lock(&mddev
->open_mutex
);
6389 if ((mddev
->pers
&& atomic_read(&mddev
->openers
) > !!bdev
) ||
6390 mddev
->sysfs_active
||
6391 mddev
->sync_thread
||
6392 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
)) {
6393 pr_warn("md: %s still in use.\n",mdname(mddev
));
6394 mutex_unlock(&mddev
->open_mutex
);
6396 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
6397 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6398 md_wakeup_thread(mddev
->thread
);
6404 set_disk_ro(disk
, 0);
6406 __md_stop_writes(mddev
);
6409 /* tell userspace to handle 'inactive' */
6410 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6412 rdev_for_each(rdev
, mddev
)
6413 if (rdev
->raid_disk
>= 0)
6414 sysfs_unlink_rdev(mddev
, rdev
);
6416 set_capacity_and_notify(disk
, 0);
6417 mutex_unlock(&mddev
->open_mutex
);
6423 mutex_unlock(&mddev
->open_mutex
);
6425 * Free resources if final stop
6428 pr_info("md: %s stopped.\n", mdname(mddev
));
6430 if (mddev
->bitmap_info
.file
) {
6431 struct file
*f
= mddev
->bitmap_info
.file
;
6432 spin_lock(&mddev
->lock
);
6433 mddev
->bitmap_info
.file
= NULL
;
6434 spin_unlock(&mddev
->lock
);
6437 mddev
->bitmap_info
.offset
= 0;
6439 export_array(mddev
);
6442 if (mddev
->hold_active
== UNTIL_STOP
)
6443 mddev
->hold_active
= 0;
6446 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6451 static void autorun_array(struct mddev
*mddev
)
6453 struct md_rdev
*rdev
;
6456 if (list_empty(&mddev
->disks
))
6459 pr_info("md: running: ");
6461 rdev_for_each(rdev
, mddev
) {
6462 pr_cont("<%pg>", rdev
->bdev
);
6466 err
= do_md_run(mddev
);
6468 pr_warn("md: do_md_run() returned %d\n", err
);
6469 do_md_stop(mddev
, 0, NULL
);
6474 * lets try to run arrays based on all disks that have arrived
6475 * until now. (those are in pending_raid_disks)
6477 * the method: pick the first pending disk, collect all disks with
6478 * the same UUID, remove all from the pending list and put them into
6479 * the 'same_array' list. Then order this list based on superblock
6480 * update time (freshest comes first), kick out 'old' disks and
6481 * compare superblocks. If everything's fine then run it.
6483 * If "unit" is allocated, then bump its reference count
6485 static void autorun_devices(int part
)
6487 struct md_rdev
*rdev0
, *rdev
, *tmp
;
6488 struct mddev
*mddev
;
6490 pr_info("md: autorun ...\n");
6491 while (!list_empty(&pending_raid_disks
)) {
6494 LIST_HEAD(candidates
);
6495 rdev0
= list_entry(pending_raid_disks
.next
,
6496 struct md_rdev
, same_set
);
6498 pr_debug("md: considering %pg ...\n", rdev0
->bdev
);
6499 INIT_LIST_HEAD(&candidates
);
6500 rdev_for_each_list(rdev
, tmp
, &pending_raid_disks
)
6501 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
6502 pr_debug("md: adding %pg ...\n",
6504 list_move(&rdev
->same_set
, &candidates
);
6507 * now we have a set of devices, with all of them having
6508 * mostly sane superblocks. It's time to allocate the
6512 dev
= MKDEV(mdp_major
,
6513 rdev0
->preferred_minor
<< MdpMinorShift
);
6514 unit
= MINOR(dev
) >> MdpMinorShift
;
6516 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
6519 if (rdev0
->preferred_minor
!= unit
) {
6520 pr_warn("md: unit number in %pg is bad: %d\n",
6521 rdev0
->bdev
, rdev0
->preferred_minor
);
6526 mddev
= mddev_find(dev
);
6530 if (mddev_lock(mddev
))
6531 pr_warn("md: %s locked, cannot run\n", mdname(mddev
));
6532 else if (mddev
->raid_disks
|| mddev
->major_version
6533 || !list_empty(&mddev
->disks
)) {
6534 pr_warn("md: %s already running, cannot run %pg\n",
6535 mdname(mddev
), rdev0
->bdev
);
6536 mddev_unlock(mddev
);
6538 pr_debug("md: created %s\n", mdname(mddev
));
6539 mddev
->persistent
= 1;
6540 rdev_for_each_list(rdev
, tmp
, &candidates
) {
6541 list_del_init(&rdev
->same_set
);
6542 if (bind_rdev_to_array(rdev
, mddev
))
6545 autorun_array(mddev
);
6546 mddev_unlock(mddev
);
6548 /* on success, candidates will be empty, on error
6551 rdev_for_each_list(rdev
, tmp
, &candidates
) {
6552 list_del_init(&rdev
->same_set
);
6557 pr_info("md: ... autorun DONE.\n");
6559 #endif /* !MODULE */
6561 static int get_version(void __user
*arg
)
6565 ver
.major
= MD_MAJOR_VERSION
;
6566 ver
.minor
= MD_MINOR_VERSION
;
6567 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
6569 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
6575 static int get_array_info(struct mddev
*mddev
, void __user
*arg
)
6577 mdu_array_info_t info
;
6578 int nr
,working
,insync
,failed
,spare
;
6579 struct md_rdev
*rdev
;
6581 nr
= working
= insync
= failed
= spare
= 0;
6583 rdev_for_each_rcu(rdev
, mddev
) {
6585 if (test_bit(Faulty
, &rdev
->flags
))
6589 if (test_bit(In_sync
, &rdev
->flags
))
6591 else if (test_bit(Journal
, &rdev
->flags
))
6592 /* TODO: add journal count to md_u.h */
6600 info
.major_version
= mddev
->major_version
;
6601 info
.minor_version
= mddev
->minor_version
;
6602 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
6603 info
.ctime
= clamp_t(time64_t
, mddev
->ctime
, 0, U32_MAX
);
6604 info
.level
= mddev
->level
;
6605 info
.size
= mddev
->dev_sectors
/ 2;
6606 if (info
.size
!= mddev
->dev_sectors
/ 2) /* overflow */
6609 info
.raid_disks
= mddev
->raid_disks
;
6610 info
.md_minor
= mddev
->md_minor
;
6611 info
.not_persistent
= !mddev
->persistent
;
6613 info
.utime
= clamp_t(time64_t
, mddev
->utime
, 0, U32_MAX
);
6616 info
.state
= (1<<MD_SB_CLEAN
);
6617 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
6618 info
.state
|= (1<<MD_SB_BITMAP_PRESENT
);
6619 if (mddev_is_clustered(mddev
))
6620 info
.state
|= (1<<MD_SB_CLUSTERED
);
6621 info
.active_disks
= insync
;
6622 info
.working_disks
= working
;
6623 info
.failed_disks
= failed
;
6624 info
.spare_disks
= spare
;
6626 info
.layout
= mddev
->layout
;
6627 info
.chunk_size
= mddev
->chunk_sectors
<< 9;
6629 if (copy_to_user(arg
, &info
, sizeof(info
)))
6635 static int get_bitmap_file(struct mddev
*mddev
, void __user
* arg
)
6637 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
6641 file
= kzalloc(sizeof(*file
), GFP_NOIO
);
6646 spin_lock(&mddev
->lock
);
6647 /* bitmap enabled */
6648 if (mddev
->bitmap_info
.file
) {
6649 ptr
= file_path(mddev
->bitmap_info
.file
, file
->pathname
,
6650 sizeof(file
->pathname
));
6654 memmove(file
->pathname
, ptr
,
6655 sizeof(file
->pathname
)-(ptr
-file
->pathname
));
6657 spin_unlock(&mddev
->lock
);
6660 copy_to_user(arg
, file
, sizeof(*file
)))
6667 static int get_disk_info(struct mddev
*mddev
, void __user
* arg
)
6669 mdu_disk_info_t info
;
6670 struct md_rdev
*rdev
;
6672 if (copy_from_user(&info
, arg
, sizeof(info
)))
6676 rdev
= md_find_rdev_nr_rcu(mddev
, info
.number
);
6678 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
6679 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
6680 info
.raid_disk
= rdev
->raid_disk
;
6682 if (test_bit(Faulty
, &rdev
->flags
))
6683 info
.state
|= (1<<MD_DISK_FAULTY
);
6684 else if (test_bit(In_sync
, &rdev
->flags
)) {
6685 info
.state
|= (1<<MD_DISK_ACTIVE
);
6686 info
.state
|= (1<<MD_DISK_SYNC
);
6688 if (test_bit(Journal
, &rdev
->flags
))
6689 info
.state
|= (1<<MD_DISK_JOURNAL
);
6690 if (test_bit(WriteMostly
, &rdev
->flags
))
6691 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
6692 if (test_bit(FailFast
, &rdev
->flags
))
6693 info
.state
|= (1<<MD_DISK_FAILFAST
);
6695 info
.major
= info
.minor
= 0;
6696 info
.raid_disk
= -1;
6697 info
.state
= (1<<MD_DISK_REMOVED
);
6701 if (copy_to_user(arg
, &info
, sizeof(info
)))
6707 int md_add_new_disk(struct mddev
*mddev
, struct mdu_disk_info_s
*info
)
6709 struct md_rdev
*rdev
;
6710 dev_t dev
= MKDEV(info
->major
,info
->minor
);
6712 if (mddev_is_clustered(mddev
) &&
6713 !(info
->state
& ((1 << MD_DISK_CLUSTER_ADD
) | (1 << MD_DISK_CANDIDATE
)))) {
6714 pr_warn("%s: Cannot add to clustered mddev.\n",
6719 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
6722 if (!mddev
->raid_disks
) {
6724 /* expecting a device which has a superblock */
6725 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
6727 pr_warn("md: md_import_device returned %ld\n",
6729 return PTR_ERR(rdev
);
6731 if (!list_empty(&mddev
->disks
)) {
6732 struct md_rdev
*rdev0
6733 = list_entry(mddev
->disks
.next
,
6734 struct md_rdev
, same_set
);
6735 err
= super_types
[mddev
->major_version
]
6736 .load_super(rdev
, rdev0
, mddev
->minor_version
);
6738 pr_warn("md: %pg has different UUID to %pg\n",
6745 err
= bind_rdev_to_array(rdev
, mddev
);
6752 * md_add_new_disk can be used once the array is assembled
6753 * to add "hot spares". They must already have a superblock
6758 if (!mddev
->pers
->hot_add_disk
) {
6759 pr_warn("%s: personality does not support diskops!\n",
6763 if (mddev
->persistent
)
6764 rdev
= md_import_device(dev
, mddev
->major_version
,
6765 mddev
->minor_version
);
6767 rdev
= md_import_device(dev
, -1, -1);
6769 pr_warn("md: md_import_device returned %ld\n",
6771 return PTR_ERR(rdev
);
6773 /* set saved_raid_disk if appropriate */
6774 if (!mddev
->persistent
) {
6775 if (info
->state
& (1<<MD_DISK_SYNC
) &&
6776 info
->raid_disk
< mddev
->raid_disks
) {
6777 rdev
->raid_disk
= info
->raid_disk
;
6778 set_bit(In_sync
, &rdev
->flags
);
6779 clear_bit(Bitmap_sync
, &rdev
->flags
);
6781 rdev
->raid_disk
= -1;
6782 rdev
->saved_raid_disk
= rdev
->raid_disk
;
6784 super_types
[mddev
->major_version
].
6785 validate_super(mddev
, rdev
);
6786 if ((info
->state
& (1<<MD_DISK_SYNC
)) &&
6787 rdev
->raid_disk
!= info
->raid_disk
) {
6788 /* This was a hot-add request, but events doesn't
6789 * match, so reject it.
6795 clear_bit(In_sync
, &rdev
->flags
); /* just to be sure */
6796 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
6797 set_bit(WriteMostly
, &rdev
->flags
);
6799 clear_bit(WriteMostly
, &rdev
->flags
);
6800 if (info
->state
& (1<<MD_DISK_FAILFAST
))
6801 set_bit(FailFast
, &rdev
->flags
);
6803 clear_bit(FailFast
, &rdev
->flags
);
6805 if (info
->state
& (1<<MD_DISK_JOURNAL
)) {
6806 struct md_rdev
*rdev2
;
6807 bool has_journal
= false;
6809 /* make sure no existing journal disk */
6810 rdev_for_each(rdev2
, mddev
) {
6811 if (test_bit(Journal
, &rdev2
->flags
)) {
6816 if (has_journal
|| mddev
->bitmap
) {
6820 set_bit(Journal
, &rdev
->flags
);
6823 * check whether the device shows up in other nodes
6825 if (mddev_is_clustered(mddev
)) {
6826 if (info
->state
& (1 << MD_DISK_CANDIDATE
))
6827 set_bit(Candidate
, &rdev
->flags
);
6828 else if (info
->state
& (1 << MD_DISK_CLUSTER_ADD
)) {
6829 /* --add initiated by this node */
6830 err
= md_cluster_ops
->add_new_disk(mddev
, rdev
);
6838 rdev
->raid_disk
= -1;
6839 err
= bind_rdev_to_array(rdev
, mddev
);
6844 if (mddev_is_clustered(mddev
)) {
6845 if (info
->state
& (1 << MD_DISK_CANDIDATE
)) {
6847 err
= md_cluster_ops
->new_disk_ack(mddev
,
6850 md_kick_rdev_from_array(rdev
);
6854 md_cluster_ops
->add_new_disk_cancel(mddev
);
6856 err
= add_bound_rdev(rdev
);
6860 err
= add_bound_rdev(rdev
);
6865 /* otherwise, md_add_new_disk is only allowed
6866 * for major_version==0 superblocks
6868 if (mddev
->major_version
!= 0) {
6869 pr_warn("%s: ADD_NEW_DISK not supported\n", mdname(mddev
));
6873 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
6875 rdev
= md_import_device(dev
, -1, 0);
6877 pr_warn("md: error, md_import_device() returned %ld\n",
6879 return PTR_ERR(rdev
);
6881 rdev
->desc_nr
= info
->number
;
6882 if (info
->raid_disk
< mddev
->raid_disks
)
6883 rdev
->raid_disk
= info
->raid_disk
;
6885 rdev
->raid_disk
= -1;
6887 if (rdev
->raid_disk
< mddev
->raid_disks
)
6888 if (info
->state
& (1<<MD_DISK_SYNC
))
6889 set_bit(In_sync
, &rdev
->flags
);
6891 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
6892 set_bit(WriteMostly
, &rdev
->flags
);
6893 if (info
->state
& (1<<MD_DISK_FAILFAST
))
6894 set_bit(FailFast
, &rdev
->flags
);
6896 if (!mddev
->persistent
) {
6897 pr_debug("md: nonpersistent superblock ...\n");
6898 rdev
->sb_start
= bdev_nr_sectors(rdev
->bdev
);
6900 rdev
->sb_start
= calc_dev_sboffset(rdev
);
6901 rdev
->sectors
= rdev
->sb_start
;
6903 err
= bind_rdev_to_array(rdev
, mddev
);
6913 static int hot_remove_disk(struct mddev
*mddev
, dev_t dev
)
6915 struct md_rdev
*rdev
;
6920 rdev
= find_rdev(mddev
, dev
);
6924 if (rdev
->raid_disk
< 0)
6927 clear_bit(Blocked
, &rdev
->flags
);
6928 remove_and_add_spares(mddev
, rdev
);
6930 if (rdev
->raid_disk
>= 0)
6934 if (mddev_is_clustered(mddev
)) {
6935 if (md_cluster_ops
->remove_disk(mddev
, rdev
))
6939 md_kick_rdev_from_array(rdev
);
6940 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
6942 md_wakeup_thread(mddev
->thread
);
6944 md_update_sb(mddev
, 1);
6949 pr_debug("md: cannot remove active disk %pg from %s ...\n",
6950 rdev
->bdev
, mdname(mddev
));
6954 static int hot_add_disk(struct mddev
*mddev
, dev_t dev
)
6957 struct md_rdev
*rdev
;
6962 if (mddev
->major_version
!= 0) {
6963 pr_warn("%s: HOT_ADD may only be used with version-0 superblocks.\n",
6967 if (!mddev
->pers
->hot_add_disk
) {
6968 pr_warn("%s: personality does not support diskops!\n",
6973 rdev
= md_import_device(dev
, -1, 0);
6975 pr_warn("md: error, md_import_device() returned %ld\n",
6980 if (mddev
->persistent
)
6981 rdev
->sb_start
= calc_dev_sboffset(rdev
);
6983 rdev
->sb_start
= bdev_nr_sectors(rdev
->bdev
);
6985 rdev
->sectors
= rdev
->sb_start
;
6987 if (test_bit(Faulty
, &rdev
->flags
)) {
6988 pr_warn("md: can not hot-add faulty %pg disk to %s!\n",
6989 rdev
->bdev
, mdname(mddev
));
6994 clear_bit(In_sync
, &rdev
->flags
);
6996 rdev
->saved_raid_disk
= -1;
6997 err
= bind_rdev_to_array(rdev
, mddev
);
7002 * The rest should better be atomic, we can have disk failures
7003 * noticed in interrupt contexts ...
7006 rdev
->raid_disk
= -1;
7008 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
7010 md_update_sb(mddev
, 1);
7012 * If the new disk does not support REQ_NOWAIT,
7013 * disable on the whole MD.
7015 if (!blk_queue_nowait(bdev_get_queue(rdev
->bdev
))) {
7016 pr_info("%s: Disabling nowait because %pg does not support nowait\n",
7017 mdname(mddev
), rdev
->bdev
);
7018 blk_queue_flag_clear(QUEUE_FLAG_NOWAIT
, mddev
->queue
);
7021 * Kick recovery, maybe this spare has to be added to the
7022 * array immediately.
7024 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7025 md_wakeup_thread(mddev
->thread
);
7034 static int set_bitmap_file(struct mddev
*mddev
, int fd
)
7039 if (!mddev
->pers
->quiesce
|| !mddev
->thread
)
7041 if (mddev
->recovery
|| mddev
->sync_thread
)
7043 /* we should be able to change the bitmap.. */
7047 struct inode
*inode
;
7050 if (mddev
->bitmap
|| mddev
->bitmap_info
.file
)
7051 return -EEXIST
; /* cannot add when bitmap is present */
7055 pr_warn("%s: error: failed to get bitmap file\n",
7060 inode
= f
->f_mapping
->host
;
7061 if (!S_ISREG(inode
->i_mode
)) {
7062 pr_warn("%s: error: bitmap file must be a regular file\n",
7065 } else if (!(f
->f_mode
& FMODE_WRITE
)) {
7066 pr_warn("%s: error: bitmap file must open for write\n",
7069 } else if (atomic_read(&inode
->i_writecount
) != 1) {
7070 pr_warn("%s: error: bitmap file is already in use\n",
7078 mddev
->bitmap_info
.file
= f
;
7079 mddev
->bitmap_info
.offset
= 0; /* file overrides offset */
7080 } else if (mddev
->bitmap
== NULL
)
7081 return -ENOENT
; /* cannot remove what isn't there */
7085 struct bitmap
*bitmap
;
7087 bitmap
= md_bitmap_create(mddev
, -1);
7088 mddev_suspend(mddev
);
7089 if (!IS_ERR(bitmap
)) {
7090 mddev
->bitmap
= bitmap
;
7091 err
= md_bitmap_load(mddev
);
7093 err
= PTR_ERR(bitmap
);
7095 md_bitmap_destroy(mddev
);
7098 mddev_resume(mddev
);
7099 } else if (fd
< 0) {
7100 mddev_suspend(mddev
);
7101 md_bitmap_destroy(mddev
);
7102 mddev_resume(mddev
);
7106 struct file
*f
= mddev
->bitmap_info
.file
;
7108 spin_lock(&mddev
->lock
);
7109 mddev
->bitmap_info
.file
= NULL
;
7110 spin_unlock(&mddev
->lock
);
7119 * md_set_array_info is used two different ways
7120 * The original usage is when creating a new array.
7121 * In this usage, raid_disks is > 0 and it together with
7122 * level, size, not_persistent,layout,chunksize determine the
7123 * shape of the array.
7124 * This will always create an array with a type-0.90.0 superblock.
7125 * The newer usage is when assembling an array.
7126 * In this case raid_disks will be 0, and the major_version field is
7127 * use to determine which style super-blocks are to be found on the devices.
7128 * The minor and patch _version numbers are also kept incase the
7129 * super_block handler wishes to interpret them.
7131 int md_set_array_info(struct mddev
*mddev
, struct mdu_array_info_s
*info
)
7133 if (info
->raid_disks
== 0) {
7134 /* just setting version number for superblock loading */
7135 if (info
->major_version
< 0 ||
7136 info
->major_version
>= ARRAY_SIZE(super_types
) ||
7137 super_types
[info
->major_version
].name
== NULL
) {
7138 /* maybe try to auto-load a module? */
7139 pr_warn("md: superblock version %d not known\n",
7140 info
->major_version
);
7143 mddev
->major_version
= info
->major_version
;
7144 mddev
->minor_version
= info
->minor_version
;
7145 mddev
->patch_version
= info
->patch_version
;
7146 mddev
->persistent
= !info
->not_persistent
;
7147 /* ensure mddev_put doesn't delete this now that there
7148 * is some minimal configuration.
7150 mddev
->ctime
= ktime_get_real_seconds();
7153 mddev
->major_version
= MD_MAJOR_VERSION
;
7154 mddev
->minor_version
= MD_MINOR_VERSION
;
7155 mddev
->patch_version
= MD_PATCHLEVEL_VERSION
;
7156 mddev
->ctime
= ktime_get_real_seconds();
7158 mddev
->level
= info
->level
;
7159 mddev
->clevel
[0] = 0;
7160 mddev
->dev_sectors
= 2 * (sector_t
)info
->size
;
7161 mddev
->raid_disks
= info
->raid_disks
;
7162 /* don't set md_minor, it is determined by which /dev/md* was
7165 if (info
->state
& (1<<MD_SB_CLEAN
))
7166 mddev
->recovery_cp
= MaxSector
;
7168 mddev
->recovery_cp
= 0;
7169 mddev
->persistent
= ! info
->not_persistent
;
7170 mddev
->external
= 0;
7172 mddev
->layout
= info
->layout
;
7173 if (mddev
->level
== 0)
7174 /* Cannot trust RAID0 layout info here */
7176 mddev
->chunk_sectors
= info
->chunk_size
>> 9;
7178 if (mddev
->persistent
) {
7179 mddev
->max_disks
= MD_SB_DISKS
;
7181 mddev
->sb_flags
= 0;
7183 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
7185 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
7186 mddev
->bitmap_info
.default_space
= 64*2 - (MD_SB_BYTES
>> 9);
7187 mddev
->bitmap_info
.offset
= 0;
7189 mddev
->reshape_position
= MaxSector
;
7192 * Generate a 128 bit UUID
7194 get_random_bytes(mddev
->uuid
, 16);
7196 mddev
->new_level
= mddev
->level
;
7197 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
7198 mddev
->new_layout
= mddev
->layout
;
7199 mddev
->delta_disks
= 0;
7200 mddev
->reshape_backwards
= 0;
7205 void md_set_array_sectors(struct mddev
*mddev
, sector_t array_sectors
)
7207 lockdep_assert_held(&mddev
->reconfig_mutex
);
7209 if (mddev
->external_size
)
7212 mddev
->array_sectors
= array_sectors
;
7214 EXPORT_SYMBOL(md_set_array_sectors
);
7216 static int update_size(struct mddev
*mddev
, sector_t num_sectors
)
7218 struct md_rdev
*rdev
;
7220 int fit
= (num_sectors
== 0);
7221 sector_t old_dev_sectors
= mddev
->dev_sectors
;
7223 if (mddev
->pers
->resize
== NULL
)
7225 /* The "num_sectors" is the number of sectors of each device that
7226 * is used. This can only make sense for arrays with redundancy.
7227 * linear and raid0 always use whatever space is available. We can only
7228 * consider changing this number if no resync or reconstruction is
7229 * happening, and if the new size is acceptable. It must fit before the
7230 * sb_start or, if that is <data_offset, it must fit before the size
7231 * of each device. If num_sectors is zero, we find the largest size
7234 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
7240 rdev_for_each(rdev
, mddev
) {
7241 sector_t avail
= rdev
->sectors
;
7243 if (fit
&& (num_sectors
== 0 || num_sectors
> avail
))
7244 num_sectors
= avail
;
7245 if (avail
< num_sectors
)
7248 rv
= mddev
->pers
->resize(mddev
, num_sectors
);
7250 if (mddev_is_clustered(mddev
))
7251 md_cluster_ops
->update_size(mddev
, old_dev_sectors
);
7252 else if (mddev
->queue
) {
7253 set_capacity_and_notify(mddev
->gendisk
,
7254 mddev
->array_sectors
);
7260 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
)
7263 struct md_rdev
*rdev
;
7264 /* change the number of raid disks */
7265 if (mddev
->pers
->check_reshape
== NULL
)
7269 if (raid_disks
<= 0 ||
7270 (mddev
->max_disks
&& raid_disks
>= mddev
->max_disks
))
7272 if (mddev
->sync_thread
||
7273 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
7274 test_bit(MD_RESYNCING_REMOTE
, &mddev
->recovery
) ||
7275 mddev
->reshape_position
!= MaxSector
)
7278 rdev_for_each(rdev
, mddev
) {
7279 if (mddev
->raid_disks
< raid_disks
&&
7280 rdev
->data_offset
< rdev
->new_data_offset
)
7282 if (mddev
->raid_disks
> raid_disks
&&
7283 rdev
->data_offset
> rdev
->new_data_offset
)
7287 mddev
->delta_disks
= raid_disks
- mddev
->raid_disks
;
7288 if (mddev
->delta_disks
< 0)
7289 mddev
->reshape_backwards
= 1;
7290 else if (mddev
->delta_disks
> 0)
7291 mddev
->reshape_backwards
= 0;
7293 rv
= mddev
->pers
->check_reshape(mddev
);
7295 mddev
->delta_disks
= 0;
7296 mddev
->reshape_backwards
= 0;
7302 * update_array_info is used to change the configuration of an
7304 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
7305 * fields in the info are checked against the array.
7306 * Any differences that cannot be handled will cause an error.
7307 * Normally, only one change can be managed at a time.
7309 static int update_array_info(struct mddev
*mddev
, mdu_array_info_t
*info
)
7315 /* calculate expected state,ignoring low bits */
7316 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
7317 state
|= (1 << MD_SB_BITMAP_PRESENT
);
7319 if (mddev
->major_version
!= info
->major_version
||
7320 mddev
->minor_version
!= info
->minor_version
||
7321 /* mddev->patch_version != info->patch_version || */
7322 mddev
->ctime
!= info
->ctime
||
7323 mddev
->level
!= info
->level
||
7324 /* mddev->layout != info->layout || */
7325 mddev
->persistent
!= !info
->not_persistent
||
7326 mddev
->chunk_sectors
!= info
->chunk_size
>> 9 ||
7327 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
7328 ((state
^info
->state
) & 0xfffffe00)
7331 /* Check there is only one change */
7332 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
7334 if (mddev
->raid_disks
!= info
->raid_disks
)
7336 if (mddev
->layout
!= info
->layout
)
7338 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
))
7345 if (mddev
->layout
!= info
->layout
) {
7347 * we don't need to do anything at the md level, the
7348 * personality will take care of it all.
7350 if (mddev
->pers
->check_reshape
== NULL
)
7353 mddev
->new_layout
= info
->layout
;
7354 rv
= mddev
->pers
->check_reshape(mddev
);
7356 mddev
->new_layout
= mddev
->layout
;
7360 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
7361 rv
= update_size(mddev
, (sector_t
)info
->size
* 2);
7363 if (mddev
->raid_disks
!= info
->raid_disks
)
7364 rv
= update_raid_disks(mddev
, info
->raid_disks
);
7366 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) {
7367 if (mddev
->pers
->quiesce
== NULL
|| mddev
->thread
== NULL
) {
7371 if (mddev
->recovery
|| mddev
->sync_thread
) {
7375 if (info
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
7376 struct bitmap
*bitmap
;
7377 /* add the bitmap */
7378 if (mddev
->bitmap
) {
7382 if (mddev
->bitmap_info
.default_offset
== 0) {
7386 mddev
->bitmap_info
.offset
=
7387 mddev
->bitmap_info
.default_offset
;
7388 mddev
->bitmap_info
.space
=
7389 mddev
->bitmap_info
.default_space
;
7390 bitmap
= md_bitmap_create(mddev
, -1);
7391 mddev_suspend(mddev
);
7392 if (!IS_ERR(bitmap
)) {
7393 mddev
->bitmap
= bitmap
;
7394 rv
= md_bitmap_load(mddev
);
7396 rv
= PTR_ERR(bitmap
);
7398 md_bitmap_destroy(mddev
);
7399 mddev_resume(mddev
);
7401 /* remove the bitmap */
7402 if (!mddev
->bitmap
) {
7406 if (mddev
->bitmap
->storage
.file
) {
7410 if (mddev
->bitmap_info
.nodes
) {
7411 /* hold PW on all the bitmap lock */
7412 if (md_cluster_ops
->lock_all_bitmaps(mddev
) <= 0) {
7413 pr_warn("md: can't change bitmap to none since the array is in use by more than one node\n");
7415 md_cluster_ops
->unlock_all_bitmaps(mddev
);
7419 mddev
->bitmap_info
.nodes
= 0;
7420 md_cluster_ops
->leave(mddev
);
7421 module_put(md_cluster_mod
);
7422 mddev
->safemode_delay
= DEFAULT_SAFEMODE_DELAY
;
7424 mddev_suspend(mddev
);
7425 md_bitmap_destroy(mddev
);
7426 mddev_resume(mddev
);
7427 mddev
->bitmap_info
.offset
= 0;
7430 md_update_sb(mddev
, 1);
7436 static int set_disk_faulty(struct mddev
*mddev
, dev_t dev
)
7438 struct md_rdev
*rdev
;
7441 if (mddev
->pers
== NULL
)
7445 rdev
= md_find_rdev_rcu(mddev
, dev
);
7449 md_error(mddev
, rdev
);
7450 if (test_bit(MD_BROKEN
, &mddev
->flags
))
7458 * We have a problem here : there is no easy way to give a CHS
7459 * virtual geometry. We currently pretend that we have a 2 heads
7460 * 4 sectors (with a BIG number of cylinders...). This drives
7461 * dosfs just mad... ;-)
7463 static int md_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
7465 struct mddev
*mddev
= bdev
->bd_disk
->private_data
;
7469 geo
->cylinders
= mddev
->array_sectors
/ 8;
7473 static inline bool md_ioctl_valid(unsigned int cmd
)
7477 case GET_ARRAY_INFO
:
7478 case GET_BITMAP_FILE
:
7481 case HOT_REMOVE_DISK
:
7483 case RESTART_ARRAY_RW
:
7485 case SET_ARRAY_INFO
:
7486 case SET_BITMAP_FILE
:
7487 case SET_DISK_FAULTY
:
7490 case CLUSTERED_DISK_NACK
:
7497 static int md_ioctl(struct block_device
*bdev
, fmode_t mode
,
7498 unsigned int cmd
, unsigned long arg
)
7501 void __user
*argp
= (void __user
*)arg
;
7502 struct mddev
*mddev
= NULL
;
7503 bool did_set_md_closing
= false;
7505 if (!md_ioctl_valid(cmd
))
7510 case GET_ARRAY_INFO
:
7514 if (!capable(CAP_SYS_ADMIN
))
7519 * Commands dealing with the RAID driver but not any
7524 err
= get_version(argp
);
7530 * Commands creating/starting a new array:
7533 mddev
= bdev
->bd_disk
->private_data
;
7540 /* Some actions do not requires the mutex */
7542 case GET_ARRAY_INFO
:
7543 if (!mddev
->raid_disks
&& !mddev
->external
)
7546 err
= get_array_info(mddev
, argp
);
7550 if (!mddev
->raid_disks
&& !mddev
->external
)
7553 err
= get_disk_info(mddev
, argp
);
7556 case SET_DISK_FAULTY
:
7557 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
7560 case GET_BITMAP_FILE
:
7561 err
= get_bitmap_file(mddev
, argp
);
7566 if (cmd
== ADD_NEW_DISK
|| cmd
== HOT_ADD_DISK
)
7567 flush_rdev_wq(mddev
);
7569 if (cmd
== HOT_REMOVE_DISK
)
7570 /* need to ensure recovery thread has run */
7571 wait_event_interruptible_timeout(mddev
->sb_wait
,
7572 !test_bit(MD_RECOVERY_NEEDED
,
7574 msecs_to_jiffies(5000));
7575 if (cmd
== STOP_ARRAY
|| cmd
== STOP_ARRAY_RO
) {
7576 /* Need to flush page cache, and ensure no-one else opens
7579 mutex_lock(&mddev
->open_mutex
);
7580 if (mddev
->pers
&& atomic_read(&mddev
->openers
) > 1) {
7581 mutex_unlock(&mddev
->open_mutex
);
7585 if (test_and_set_bit(MD_CLOSING
, &mddev
->flags
)) {
7586 mutex_unlock(&mddev
->open_mutex
);
7590 did_set_md_closing
= true;
7591 mutex_unlock(&mddev
->open_mutex
);
7592 sync_blockdev(bdev
);
7594 err
= mddev_lock(mddev
);
7596 pr_debug("md: ioctl lock interrupted, reason %d, cmd %d\n",
7601 if (cmd
== SET_ARRAY_INFO
) {
7602 mdu_array_info_t info
;
7604 memset(&info
, 0, sizeof(info
));
7605 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
7610 err
= update_array_info(mddev
, &info
);
7612 pr_warn("md: couldn't update array info. %d\n", err
);
7617 if (!list_empty(&mddev
->disks
)) {
7618 pr_warn("md: array %s already has disks!\n", mdname(mddev
));
7622 if (mddev
->raid_disks
) {
7623 pr_warn("md: array %s already initialised!\n", mdname(mddev
));
7627 err
= md_set_array_info(mddev
, &info
);
7629 pr_warn("md: couldn't set array info. %d\n", err
);
7636 * Commands querying/configuring an existing array:
7638 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
7639 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
7640 if ((!mddev
->raid_disks
&& !mddev
->external
)
7641 && cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
7642 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
7643 && cmd
!= GET_BITMAP_FILE
) {
7649 * Commands even a read-only array can execute:
7652 case RESTART_ARRAY_RW
:
7653 err
= restart_array(mddev
);
7657 err
= do_md_stop(mddev
, 0, bdev
);
7661 err
= md_set_readonly(mddev
, bdev
);
7664 case HOT_REMOVE_DISK
:
7665 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
7669 /* We can support ADD_NEW_DISK on read-only arrays
7670 * only if we are re-adding a preexisting device.
7671 * So require mddev->pers and MD_DISK_SYNC.
7674 mdu_disk_info_t info
;
7675 if (copy_from_user(&info
, argp
, sizeof(info
)))
7677 else if (!(info
.state
& (1<<MD_DISK_SYNC
)))
7678 /* Need to clear read-only for this */
7681 err
= md_add_new_disk(mddev
, &info
);
7688 * The remaining ioctls are changing the state of the
7689 * superblock, so we do not allow them on read-only arrays.
7691 if (mddev
->ro
&& mddev
->pers
) {
7692 if (mddev
->ro
== 2) {
7694 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7695 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7696 /* mddev_unlock will wake thread */
7697 /* If a device failed while we were read-only, we
7698 * need to make sure the metadata is updated now.
7700 if (test_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
)) {
7701 mddev_unlock(mddev
);
7702 wait_event(mddev
->sb_wait
,
7703 !test_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
) &&
7704 !test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
));
7705 mddev_lock_nointr(mddev
);
7716 mdu_disk_info_t info
;
7717 if (copy_from_user(&info
, argp
, sizeof(info
)))
7720 err
= md_add_new_disk(mddev
, &info
);
7724 case CLUSTERED_DISK_NACK
:
7725 if (mddev_is_clustered(mddev
))
7726 md_cluster_ops
->new_disk_ack(mddev
, false);
7732 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
7736 err
= do_md_run(mddev
);
7739 case SET_BITMAP_FILE
:
7740 err
= set_bitmap_file(mddev
, (int)arg
);
7749 if (mddev
->hold_active
== UNTIL_IOCTL
&&
7751 mddev
->hold_active
= 0;
7752 mddev_unlock(mddev
);
7754 if(did_set_md_closing
)
7755 clear_bit(MD_CLOSING
, &mddev
->flags
);
7758 #ifdef CONFIG_COMPAT
7759 static int md_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
7760 unsigned int cmd
, unsigned long arg
)
7763 case HOT_REMOVE_DISK
:
7765 case SET_DISK_FAULTY
:
7766 case SET_BITMAP_FILE
:
7767 /* These take in integer arg, do not convert */
7770 arg
= (unsigned long)compat_ptr(arg
);
7774 return md_ioctl(bdev
, mode
, cmd
, arg
);
7776 #endif /* CONFIG_COMPAT */
7778 static int md_set_read_only(struct block_device
*bdev
, bool ro
)
7780 struct mddev
*mddev
= bdev
->bd_disk
->private_data
;
7783 err
= mddev_lock(mddev
);
7787 if (!mddev
->raid_disks
&& !mddev
->external
) {
7793 * Transitioning to read-auto need only happen for arrays that call
7794 * md_write_start and which are not ready for writes yet.
7796 if (!ro
&& mddev
->ro
== 1 && mddev
->pers
) {
7797 err
= restart_array(mddev
);
7804 mddev_unlock(mddev
);
7808 static int md_open(struct block_device
*bdev
, fmode_t mode
)
7811 * Succeed if we can lock the mddev, which confirms that
7812 * it isn't being stopped right now.
7814 struct mddev
*mddev
= mddev_find(bdev
->bd_dev
);
7820 if (mddev
->gendisk
!= bdev
->bd_disk
) {
7821 /* we are racing with mddev_put which is discarding this
7825 /* Wait until bdev->bd_disk is definitely gone */
7826 if (work_pending(&mddev
->del_work
))
7827 flush_workqueue(md_misc_wq
);
7830 BUG_ON(mddev
!= bdev
->bd_disk
->private_data
);
7832 if ((err
= mutex_lock_interruptible(&mddev
->open_mutex
)))
7835 if (test_bit(MD_CLOSING
, &mddev
->flags
)) {
7836 mutex_unlock(&mddev
->open_mutex
);
7842 atomic_inc(&mddev
->openers
);
7843 mutex_unlock(&mddev
->open_mutex
);
7845 bdev_check_media_change(bdev
);
7852 static void md_release(struct gendisk
*disk
, fmode_t mode
)
7854 struct mddev
*mddev
= disk
->private_data
;
7857 atomic_dec(&mddev
->openers
);
7861 static unsigned int md_check_events(struct gendisk
*disk
, unsigned int clearing
)
7863 struct mddev
*mddev
= disk
->private_data
;
7864 unsigned int ret
= 0;
7867 ret
= DISK_EVENT_MEDIA_CHANGE
;
7872 static void md_free_disk(struct gendisk
*disk
)
7874 struct mddev
*mddev
= disk
->private_data
;
7876 percpu_ref_exit(&mddev
->writes_pending
);
7877 bioset_exit(&mddev
->bio_set
);
7878 bioset_exit(&mddev
->sync_set
);
7883 const struct block_device_operations md_fops
=
7885 .owner
= THIS_MODULE
,
7886 .submit_bio
= md_submit_bio
,
7888 .release
= md_release
,
7890 #ifdef CONFIG_COMPAT
7891 .compat_ioctl
= md_compat_ioctl
,
7893 .getgeo
= md_getgeo
,
7894 .check_events
= md_check_events
,
7895 .set_read_only
= md_set_read_only
,
7896 .free_disk
= md_free_disk
,
7899 static int md_thread(void *arg
)
7901 struct md_thread
*thread
= arg
;
7904 * md_thread is a 'system-thread', it's priority should be very
7905 * high. We avoid resource deadlocks individually in each
7906 * raid personality. (RAID5 does preallocation) We also use RR and
7907 * the very same RT priority as kswapd, thus we will never get
7908 * into a priority inversion deadlock.
7910 * we definitely have to have equal or higher priority than
7911 * bdflush, otherwise bdflush will deadlock if there are too
7912 * many dirty RAID5 blocks.
7915 allow_signal(SIGKILL
);
7916 while (!kthread_should_stop()) {
7918 /* We need to wait INTERRUPTIBLE so that
7919 * we don't add to the load-average.
7920 * That means we need to be sure no signals are
7923 if (signal_pending(current
))
7924 flush_signals(current
);
7926 wait_event_interruptible_timeout
7928 test_bit(THREAD_WAKEUP
, &thread
->flags
)
7929 || kthread_should_stop() || kthread_should_park(),
7932 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
7933 if (kthread_should_park())
7935 if (!kthread_should_stop())
7936 thread
->run(thread
);
7942 void md_wakeup_thread(struct md_thread
*thread
)
7945 pr_debug("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
7946 set_bit(THREAD_WAKEUP
, &thread
->flags
);
7947 wake_up(&thread
->wqueue
);
7950 EXPORT_SYMBOL(md_wakeup_thread
);
7952 struct md_thread
*md_register_thread(void (*run
) (struct md_thread
*),
7953 struct mddev
*mddev
, const char *name
)
7955 struct md_thread
*thread
;
7957 thread
= kzalloc(sizeof(struct md_thread
), GFP_KERNEL
);
7961 init_waitqueue_head(&thread
->wqueue
);
7964 thread
->mddev
= mddev
;
7965 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
7966 thread
->tsk
= kthread_run(md_thread
, thread
,
7968 mdname(thread
->mddev
),
7970 if (IS_ERR(thread
->tsk
)) {
7976 EXPORT_SYMBOL(md_register_thread
);
7978 void md_unregister_thread(struct md_thread
**threadp
)
7980 struct md_thread
*thread
;
7983 * Locking ensures that mddev_unlock does not wake_up a
7984 * non-existent thread
7986 spin_lock(&pers_lock
);
7989 spin_unlock(&pers_lock
);
7993 spin_unlock(&pers_lock
);
7995 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread
->tsk
));
7996 kthread_stop(thread
->tsk
);
7999 EXPORT_SYMBOL(md_unregister_thread
);
8001 void md_error(struct mddev
*mddev
, struct md_rdev
*rdev
)
8003 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
8006 if (!mddev
->pers
|| !mddev
->pers
->error_handler
)
8008 mddev
->pers
->error_handler(mddev
, rdev
);
8010 if (mddev
->degraded
&& !test_bit(MD_BROKEN
, &mddev
->flags
))
8011 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8012 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
8013 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8014 if (!test_bit(MD_BROKEN
, &mddev
->flags
)) {
8015 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
8016 md_wakeup_thread(mddev
->thread
);
8018 if (mddev
->event_work
.func
)
8019 queue_work(md_misc_wq
, &mddev
->event_work
);
8022 EXPORT_SYMBOL(md_error
);
8024 /* seq_file implementation /proc/mdstat */
8026 static void status_unused(struct seq_file
*seq
)
8029 struct md_rdev
*rdev
;
8031 seq_printf(seq
, "unused devices: ");
8033 list_for_each_entry(rdev
, &pending_raid_disks
, same_set
) {
8035 seq_printf(seq
, "%pg ", rdev
->bdev
);
8038 seq_printf(seq
, "<none>");
8040 seq_printf(seq
, "\n");
8043 static int status_resync(struct seq_file
*seq
, struct mddev
*mddev
)
8045 sector_t max_sectors
, resync
, res
;
8046 unsigned long dt
, db
= 0;
8047 sector_t rt
, curr_mark_cnt
, resync_mark_cnt
;
8048 int scale
, recovery_active
;
8049 unsigned int per_milli
;
8051 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
8052 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
8053 max_sectors
= mddev
->resync_max_sectors
;
8055 max_sectors
= mddev
->dev_sectors
;
8057 resync
= mddev
->curr_resync
;
8058 if (resync
< MD_RESYNC_ACTIVE
) {
8059 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
8060 /* Still cleaning up */
8061 resync
= max_sectors
;
8062 } else if (resync
> max_sectors
) {
8063 resync
= max_sectors
;
8065 resync
-= atomic_read(&mddev
->recovery_active
);
8066 if (resync
< MD_RESYNC_ACTIVE
) {
8068 * Resync has started, but the subtraction has
8069 * yielded one of the special values. Force it
8070 * to active to ensure the status reports an
8073 resync
= MD_RESYNC_ACTIVE
;
8077 if (resync
== MD_RESYNC_NONE
) {
8078 if (test_bit(MD_RESYNCING_REMOTE
, &mddev
->recovery
)) {
8079 struct md_rdev
*rdev
;
8081 rdev_for_each(rdev
, mddev
)
8082 if (rdev
->raid_disk
>= 0 &&
8083 !test_bit(Faulty
, &rdev
->flags
) &&
8084 rdev
->recovery_offset
!= MaxSector
&&
8085 rdev
->recovery_offset
) {
8086 seq_printf(seq
, "\trecover=REMOTE");
8089 if (mddev
->reshape_position
!= MaxSector
)
8090 seq_printf(seq
, "\treshape=REMOTE");
8092 seq_printf(seq
, "\tresync=REMOTE");
8095 if (mddev
->recovery_cp
< MaxSector
) {
8096 seq_printf(seq
, "\tresync=PENDING");
8101 if (resync
< MD_RESYNC_ACTIVE
) {
8102 seq_printf(seq
, "\tresync=DELAYED");
8106 WARN_ON(max_sectors
== 0);
8107 /* Pick 'scale' such that (resync>>scale)*1000 will fit
8108 * in a sector_t, and (max_sectors>>scale) will fit in a
8109 * u32, as those are the requirements for sector_div.
8110 * Thus 'scale' must be at least 10
8113 if (sizeof(sector_t
) > sizeof(unsigned long)) {
8114 while ( max_sectors
/2 > (1ULL<<(scale
+32)))
8117 res
= (resync
>>scale
)*1000;
8118 sector_div(res
, (u32
)((max_sectors
>>scale
)+1));
8122 int i
, x
= per_milli
/50, y
= 20-x
;
8123 seq_printf(seq
, "[");
8124 for (i
= 0; i
< x
; i
++)
8125 seq_printf(seq
, "=");
8126 seq_printf(seq
, ">");
8127 for (i
= 0; i
< y
; i
++)
8128 seq_printf(seq
, ".");
8129 seq_printf(seq
, "] ");
8131 seq_printf(seq
, " %s =%3u.%u%% (%llu/%llu)",
8132 (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)?
8134 (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)?
8136 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
8137 "resync" : "recovery"))),
8138 per_milli
/10, per_milli
% 10,
8139 (unsigned long long) resync
/2,
8140 (unsigned long long) max_sectors
/2);
8143 * dt: time from mark until now
8144 * db: blocks written from mark until now
8145 * rt: remaining time
8147 * rt is a sector_t, which is always 64bit now. We are keeping
8148 * the original algorithm, but it is not really necessary.
8150 * Original algorithm:
8151 * So we divide before multiply in case it is 32bit and close
8153 * We scale the divisor (db) by 32 to avoid losing precision
8154 * near the end of resync when the number of remaining sectors
8156 * We then divide rt by 32 after multiplying by db to compensate.
8157 * The '+1' avoids division by zero if db is very small.
8159 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
8162 curr_mark_cnt
= mddev
->curr_mark_cnt
;
8163 recovery_active
= atomic_read(&mddev
->recovery_active
);
8164 resync_mark_cnt
= mddev
->resync_mark_cnt
;
8166 if (curr_mark_cnt
>= (recovery_active
+ resync_mark_cnt
))
8167 db
= curr_mark_cnt
- (recovery_active
+ resync_mark_cnt
);
8169 rt
= max_sectors
- resync
; /* number of remaining sectors */
8170 rt
= div64_u64(rt
, db
/32+1);
8174 seq_printf(seq
, " finish=%lu.%lumin", (unsigned long)rt
/ 60,
8175 ((unsigned long)rt
% 60)/6);
8177 seq_printf(seq
, " speed=%ldK/sec", db
/2/dt
);
8181 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
8183 struct list_head
*tmp
;
8185 struct mddev
*mddev
;
8197 spin_lock(&all_mddevs_lock
);
8198 list_for_each(tmp
,&all_mddevs
)
8200 mddev
= list_entry(tmp
, struct mddev
, all_mddevs
);
8202 spin_unlock(&all_mddevs_lock
);
8205 spin_unlock(&all_mddevs_lock
);
8207 return (void*)2;/* tail */
8211 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
8213 struct list_head
*tmp
;
8214 struct mddev
*next_mddev
, *mddev
= v
;
8220 spin_lock(&all_mddevs_lock
);
8222 tmp
= all_mddevs
.next
;
8224 tmp
= mddev
->all_mddevs
.next
;
8225 if (tmp
!= &all_mddevs
)
8226 next_mddev
= mddev_get(list_entry(tmp
,struct mddev
,all_mddevs
));
8228 next_mddev
= (void*)2;
8231 spin_unlock(&all_mddevs_lock
);
8239 static void md_seq_stop(struct seq_file
*seq
, void *v
)
8241 struct mddev
*mddev
= v
;
8243 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
8247 static int md_seq_show(struct seq_file
*seq
, void *v
)
8249 struct mddev
*mddev
= v
;
8251 struct md_rdev
*rdev
;
8253 if (v
== (void*)1) {
8254 struct md_personality
*pers
;
8255 seq_printf(seq
, "Personalities : ");
8256 spin_lock(&pers_lock
);
8257 list_for_each_entry(pers
, &pers_list
, list
)
8258 seq_printf(seq
, "[%s] ", pers
->name
);
8260 spin_unlock(&pers_lock
);
8261 seq_printf(seq
, "\n");
8262 seq
->poll_event
= atomic_read(&md_event_count
);
8265 if (v
== (void*)2) {
8270 spin_lock(&mddev
->lock
);
8271 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
8272 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
8273 mddev
->pers
? "" : "in");
8276 seq_printf(seq
, " (read-only)");
8278 seq_printf(seq
, " (auto-read-only)");
8279 seq_printf(seq
, " %s", mddev
->pers
->name
);
8284 rdev_for_each_rcu(rdev
, mddev
) {
8285 seq_printf(seq
, " %pg[%d]", rdev
->bdev
, rdev
->desc_nr
);
8287 if (test_bit(WriteMostly
, &rdev
->flags
))
8288 seq_printf(seq
, "(W)");
8289 if (test_bit(Journal
, &rdev
->flags
))
8290 seq_printf(seq
, "(J)");
8291 if (test_bit(Faulty
, &rdev
->flags
)) {
8292 seq_printf(seq
, "(F)");
8295 if (rdev
->raid_disk
< 0)
8296 seq_printf(seq
, "(S)"); /* spare */
8297 if (test_bit(Replacement
, &rdev
->flags
))
8298 seq_printf(seq
, "(R)");
8299 sectors
+= rdev
->sectors
;
8303 if (!list_empty(&mddev
->disks
)) {
8305 seq_printf(seq
, "\n %llu blocks",
8306 (unsigned long long)
8307 mddev
->array_sectors
/ 2);
8309 seq_printf(seq
, "\n %llu blocks",
8310 (unsigned long long)sectors
/ 2);
8312 if (mddev
->persistent
) {
8313 if (mddev
->major_version
!= 0 ||
8314 mddev
->minor_version
!= 90) {
8315 seq_printf(seq
," super %d.%d",
8316 mddev
->major_version
,
8317 mddev
->minor_version
);
8319 } else if (mddev
->external
)
8320 seq_printf(seq
, " super external:%s",
8321 mddev
->metadata_type
);
8323 seq_printf(seq
, " super non-persistent");
8326 mddev
->pers
->status(seq
, mddev
);
8327 seq_printf(seq
, "\n ");
8328 if (mddev
->pers
->sync_request
) {
8329 if (status_resync(seq
, mddev
))
8330 seq_printf(seq
, "\n ");
8333 seq_printf(seq
, "\n ");
8335 md_bitmap_status(seq
, mddev
->bitmap
);
8337 seq_printf(seq
, "\n");
8339 spin_unlock(&mddev
->lock
);
8344 static const struct seq_operations md_seq_ops
= {
8345 .start
= md_seq_start
,
8346 .next
= md_seq_next
,
8347 .stop
= md_seq_stop
,
8348 .show
= md_seq_show
,
8351 static int md_seq_open(struct inode
*inode
, struct file
*file
)
8353 struct seq_file
*seq
;
8356 error
= seq_open(file
, &md_seq_ops
);
8360 seq
= file
->private_data
;
8361 seq
->poll_event
= atomic_read(&md_event_count
);
8365 static int md_unloading
;
8366 static __poll_t
mdstat_poll(struct file
*filp
, poll_table
*wait
)
8368 struct seq_file
*seq
= filp
->private_data
;
8372 return EPOLLIN
|EPOLLRDNORM
|EPOLLERR
|EPOLLPRI
;
8373 poll_wait(filp
, &md_event_waiters
, wait
);
8375 /* always allow read */
8376 mask
= EPOLLIN
| EPOLLRDNORM
;
8378 if (seq
->poll_event
!= atomic_read(&md_event_count
))
8379 mask
|= EPOLLERR
| EPOLLPRI
;
8383 static const struct proc_ops mdstat_proc_ops
= {
8384 .proc_open
= md_seq_open
,
8385 .proc_read
= seq_read
,
8386 .proc_lseek
= seq_lseek
,
8387 .proc_release
= seq_release
,
8388 .proc_poll
= mdstat_poll
,
8391 int register_md_personality(struct md_personality
*p
)
8393 pr_debug("md: %s personality registered for level %d\n",
8395 spin_lock(&pers_lock
);
8396 list_add_tail(&p
->list
, &pers_list
);
8397 spin_unlock(&pers_lock
);
8400 EXPORT_SYMBOL(register_md_personality
);
8402 int unregister_md_personality(struct md_personality
*p
)
8404 pr_debug("md: %s personality unregistered\n", p
->name
);
8405 spin_lock(&pers_lock
);
8406 list_del_init(&p
->list
);
8407 spin_unlock(&pers_lock
);
8410 EXPORT_SYMBOL(unregister_md_personality
);
8412 int register_md_cluster_operations(struct md_cluster_operations
*ops
,
8413 struct module
*module
)
8416 spin_lock(&pers_lock
);
8417 if (md_cluster_ops
!= NULL
)
8420 md_cluster_ops
= ops
;
8421 md_cluster_mod
= module
;
8423 spin_unlock(&pers_lock
);
8426 EXPORT_SYMBOL(register_md_cluster_operations
);
8428 int unregister_md_cluster_operations(void)
8430 spin_lock(&pers_lock
);
8431 md_cluster_ops
= NULL
;
8432 spin_unlock(&pers_lock
);
8435 EXPORT_SYMBOL(unregister_md_cluster_operations
);
8437 int md_setup_cluster(struct mddev
*mddev
, int nodes
)
8440 if (!md_cluster_ops
)
8441 request_module("md-cluster");
8442 spin_lock(&pers_lock
);
8443 /* ensure module won't be unloaded */
8444 if (!md_cluster_ops
|| !try_module_get(md_cluster_mod
)) {
8445 pr_warn("can't find md-cluster module or get its reference.\n");
8446 spin_unlock(&pers_lock
);
8449 spin_unlock(&pers_lock
);
8451 ret
= md_cluster_ops
->join(mddev
, nodes
);
8453 mddev
->safemode_delay
= 0;
8457 void md_cluster_stop(struct mddev
*mddev
)
8459 if (!md_cluster_ops
)
8461 md_cluster_ops
->leave(mddev
);
8462 module_put(md_cluster_mod
);
8465 static int is_mddev_idle(struct mddev
*mddev
, int init
)
8467 struct md_rdev
*rdev
;
8473 rdev_for_each_rcu(rdev
, mddev
) {
8474 struct gendisk
*disk
= rdev
->bdev
->bd_disk
;
8475 curr_events
= (int)part_stat_read_accum(disk
->part0
, sectors
) -
8476 atomic_read(&disk
->sync_io
);
8477 /* sync IO will cause sync_io to increase before the disk_stats
8478 * as sync_io is counted when a request starts, and
8479 * disk_stats is counted when it completes.
8480 * So resync activity will cause curr_events to be smaller than
8481 * when there was no such activity.
8482 * non-sync IO will cause disk_stat to increase without
8483 * increasing sync_io so curr_events will (eventually)
8484 * be larger than it was before. Once it becomes
8485 * substantially larger, the test below will cause
8486 * the array to appear non-idle, and resync will slow
8488 * If there is a lot of outstanding resync activity when
8489 * we set last_event to curr_events, then all that activity
8490 * completing might cause the array to appear non-idle
8491 * and resync will be slowed down even though there might
8492 * not have been non-resync activity. This will only
8493 * happen once though. 'last_events' will soon reflect
8494 * the state where there is little or no outstanding
8495 * resync requests, and further resync activity will
8496 * always make curr_events less than last_events.
8499 if (init
|| curr_events
- rdev
->last_events
> 64) {
8500 rdev
->last_events
= curr_events
;
8508 void md_done_sync(struct mddev
*mddev
, int blocks
, int ok
)
8510 /* another "blocks" (512byte) blocks have been synced */
8511 atomic_sub(blocks
, &mddev
->recovery_active
);
8512 wake_up(&mddev
->recovery_wait
);
8514 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8515 set_bit(MD_RECOVERY_ERROR
, &mddev
->recovery
);
8516 md_wakeup_thread(mddev
->thread
);
8517 // stop recovery, signal do_sync ....
8520 EXPORT_SYMBOL(md_done_sync
);
8522 /* md_write_start(mddev, bi)
8523 * If we need to update some array metadata (e.g. 'active' flag
8524 * in superblock) before writing, schedule a superblock update
8525 * and wait for it to complete.
8526 * A return value of 'false' means that the write wasn't recorded
8527 * and cannot proceed as the array is being suspend.
8529 bool md_write_start(struct mddev
*mddev
, struct bio
*bi
)
8533 if (bio_data_dir(bi
) != WRITE
)
8536 BUG_ON(mddev
->ro
== 1);
8537 if (mddev
->ro
== 2) {
8538 /* need to switch to read/write */
8540 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
8541 md_wakeup_thread(mddev
->thread
);
8542 md_wakeup_thread(mddev
->sync_thread
);
8546 percpu_ref_get(&mddev
->writes_pending
);
8547 smp_mb(); /* Match smp_mb in set_in_sync() */
8548 if (mddev
->safemode
== 1)
8549 mddev
->safemode
= 0;
8550 /* sync_checkers is always 0 when writes_pending is in per-cpu mode */
8551 if (mddev
->in_sync
|| mddev
->sync_checkers
) {
8552 spin_lock(&mddev
->lock
);
8553 if (mddev
->in_sync
) {
8555 set_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
8556 set_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
8557 md_wakeup_thread(mddev
->thread
);
8560 spin_unlock(&mddev
->lock
);
8564 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
8565 if (!mddev
->has_superblocks
)
8567 wait_event(mddev
->sb_wait
,
8568 !test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
) ||
8570 if (test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
)) {
8571 percpu_ref_put(&mddev
->writes_pending
);
8576 EXPORT_SYMBOL(md_write_start
);
8578 /* md_write_inc can only be called when md_write_start() has
8579 * already been called at least once of the current request.
8580 * It increments the counter and is useful when a single request
8581 * is split into several parts. Each part causes an increment and
8582 * so needs a matching md_write_end().
8583 * Unlike md_write_start(), it is safe to call md_write_inc() inside
8584 * a spinlocked region.
8586 void md_write_inc(struct mddev
*mddev
, struct bio
*bi
)
8588 if (bio_data_dir(bi
) != WRITE
)
8590 WARN_ON_ONCE(mddev
->in_sync
|| mddev
->ro
);
8591 percpu_ref_get(&mddev
->writes_pending
);
8593 EXPORT_SYMBOL(md_write_inc
);
8595 void md_write_end(struct mddev
*mddev
)
8597 percpu_ref_put(&mddev
->writes_pending
);
8599 if (mddev
->safemode
== 2)
8600 md_wakeup_thread(mddev
->thread
);
8601 else if (mddev
->safemode_delay
)
8602 /* The roundup() ensures this only performs locking once
8603 * every ->safemode_delay jiffies
8605 mod_timer(&mddev
->safemode_timer
,
8606 roundup(jiffies
, mddev
->safemode_delay
) +
8607 mddev
->safemode_delay
);
8610 EXPORT_SYMBOL(md_write_end
);
8612 /* This is used by raid0 and raid10 */
8613 void md_submit_discard_bio(struct mddev
*mddev
, struct md_rdev
*rdev
,
8614 struct bio
*bio
, sector_t start
, sector_t size
)
8616 struct bio
*discard_bio
= NULL
;
8618 if (__blkdev_issue_discard(rdev
->bdev
, start
, size
, GFP_NOIO
,
8619 &discard_bio
) || !discard_bio
)
8622 bio_chain(discard_bio
, bio
);
8623 bio_clone_blkg_association(discard_bio
, bio
);
8625 trace_block_bio_remap(discard_bio
,
8626 disk_devt(mddev
->gendisk
),
8627 bio
->bi_iter
.bi_sector
);
8628 submit_bio_noacct(discard_bio
);
8630 EXPORT_SYMBOL_GPL(md_submit_discard_bio
);
8632 int acct_bioset_init(struct mddev
*mddev
)
8636 if (!bioset_initialized(&mddev
->io_acct_set
))
8637 err
= bioset_init(&mddev
->io_acct_set
, BIO_POOL_SIZE
,
8638 offsetof(struct md_io_acct
, bio_clone
), 0);
8641 EXPORT_SYMBOL_GPL(acct_bioset_init
);
8643 void acct_bioset_exit(struct mddev
*mddev
)
8645 bioset_exit(&mddev
->io_acct_set
);
8647 EXPORT_SYMBOL_GPL(acct_bioset_exit
);
8649 static void md_end_io_acct(struct bio
*bio
)
8651 struct md_io_acct
*md_io_acct
= bio
->bi_private
;
8652 struct bio
*orig_bio
= md_io_acct
->orig_bio
;
8654 orig_bio
->bi_status
= bio
->bi_status
;
8656 bio_end_io_acct(orig_bio
, md_io_acct
->start_time
);
8658 bio_endio(orig_bio
);
8662 * Used by personalities that don't already clone the bio and thus can't
8663 * easily add the timestamp to their extended bio structure.
8665 void md_account_bio(struct mddev
*mddev
, struct bio
**bio
)
8667 struct block_device
*bdev
= (*bio
)->bi_bdev
;
8668 struct md_io_acct
*md_io_acct
;
8671 if (!blk_queue_io_stat(bdev
->bd_disk
->queue
))
8674 clone
= bio_alloc_clone(bdev
, *bio
, GFP_NOIO
, &mddev
->io_acct_set
);
8675 md_io_acct
= container_of(clone
, struct md_io_acct
, bio_clone
);
8676 md_io_acct
->orig_bio
= *bio
;
8677 md_io_acct
->start_time
= bio_start_io_acct(*bio
);
8679 clone
->bi_end_io
= md_end_io_acct
;
8680 clone
->bi_private
= md_io_acct
;
8683 EXPORT_SYMBOL_GPL(md_account_bio
);
8685 /* md_allow_write(mddev)
8686 * Calling this ensures that the array is marked 'active' so that writes
8687 * may proceed without blocking. It is important to call this before
8688 * attempting a GFP_KERNEL allocation while holding the mddev lock.
8689 * Must be called with mddev_lock held.
8691 void md_allow_write(struct mddev
*mddev
)
8697 if (!mddev
->pers
->sync_request
)
8700 spin_lock(&mddev
->lock
);
8701 if (mddev
->in_sync
) {
8703 set_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
8704 set_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
8705 if (mddev
->safemode_delay
&&
8706 mddev
->safemode
== 0)
8707 mddev
->safemode
= 1;
8708 spin_unlock(&mddev
->lock
);
8709 md_update_sb(mddev
, 0);
8710 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
8711 /* wait for the dirty state to be recorded in the metadata */
8712 wait_event(mddev
->sb_wait
,
8713 !test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
));
8715 spin_unlock(&mddev
->lock
);
8717 EXPORT_SYMBOL_GPL(md_allow_write
);
8719 #define SYNC_MARKS 10
8720 #define SYNC_MARK_STEP (3*HZ)
8721 #define UPDATE_FREQUENCY (5*60*HZ)
8722 void md_do_sync(struct md_thread
*thread
)
8724 struct mddev
*mddev
= thread
->mddev
;
8725 struct mddev
*mddev2
;
8726 unsigned int currspeed
= 0, window
;
8727 sector_t max_sectors
,j
, io_sectors
, recovery_done
;
8728 unsigned long mark
[SYNC_MARKS
];
8729 unsigned long update_time
;
8730 sector_t mark_cnt
[SYNC_MARKS
];
8732 struct list_head
*tmp
;
8733 sector_t last_check
;
8735 struct md_rdev
*rdev
;
8736 char *desc
, *action
= NULL
;
8737 struct blk_plug plug
;
8740 /* just incase thread restarts... */
8741 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
8742 test_bit(MD_RECOVERY_WAIT
, &mddev
->recovery
))
8744 if (mddev
->ro
) {/* never try to sync a read-only array */
8745 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8749 if (mddev_is_clustered(mddev
)) {
8750 ret
= md_cluster_ops
->resync_start(mddev
);
8754 set_bit(MD_CLUSTER_RESYNC_LOCKED
, &mddev
->flags
);
8755 if (!(test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
8756 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) ||
8757 test_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
))
8758 && ((unsigned long long)mddev
->curr_resync_completed
8759 < (unsigned long long)mddev
->resync_max_sectors
))
8763 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
8764 if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)) {
8765 desc
= "data-check";
8767 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
8768 desc
= "requested-resync";
8772 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
8777 mddev
->last_sync_action
= action
?: desc
;
8780 * Before starting a resync we must have set curr_resync to
8781 * 2, and then checked that every "conflicting" array has curr_resync
8782 * less than ours. When we find one that is the same or higher
8783 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
8784 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
8785 * This will mean we have to start checking from the beginning again.
8790 int mddev2_minor
= -1;
8791 mddev
->curr_resync
= MD_RESYNC_DELAYED
;
8794 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
8796 for_each_mddev(mddev2
, tmp
) {
8797 if (mddev2
== mddev
)
8799 if (!mddev
->parallel_resync
8800 && mddev2
->curr_resync
8801 && match_mddev_units(mddev
, mddev2
)) {
8803 if (mddev
< mddev2
&&
8804 mddev
->curr_resync
== MD_RESYNC_DELAYED
) {
8805 /* arbitrarily yield */
8806 mddev
->curr_resync
= MD_RESYNC_YIELDED
;
8807 wake_up(&resync_wait
);
8809 if (mddev
> mddev2
&&
8810 mddev
->curr_resync
== MD_RESYNC_YIELDED
)
8811 /* no need to wait here, we can wait the next
8812 * time 'round when curr_resync == 2
8815 /* We need to wait 'interruptible' so as not to
8816 * contribute to the load average, and not to
8817 * be caught by 'softlockup'
8819 prepare_to_wait(&resync_wait
, &wq
, TASK_INTERRUPTIBLE
);
8820 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
8821 mddev2
->curr_resync
>= mddev
->curr_resync
) {
8822 if (mddev2_minor
!= mddev2
->md_minor
) {
8823 mddev2_minor
= mddev2
->md_minor
;
8824 pr_info("md: delaying %s of %s until %s has finished (they share one or more physical units)\n",
8825 desc
, mdname(mddev
),
8829 if (signal_pending(current
))
8830 flush_signals(current
);
8832 finish_wait(&resync_wait
, &wq
);
8835 finish_wait(&resync_wait
, &wq
);
8838 } while (mddev
->curr_resync
< MD_RESYNC_DELAYED
);
8841 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
8842 /* resync follows the size requested by the personality,
8843 * which defaults to physical size, but can be virtual size
8845 max_sectors
= mddev
->resync_max_sectors
;
8846 atomic64_set(&mddev
->resync_mismatches
, 0);
8847 /* we don't use the checkpoint if there's a bitmap */
8848 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
8849 j
= mddev
->resync_min
;
8850 else if (!mddev
->bitmap
)
8851 j
= mddev
->recovery_cp
;
8853 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)) {
8854 max_sectors
= mddev
->resync_max_sectors
;
8856 * If the original node aborts reshaping then we continue the
8857 * reshaping, so set j again to avoid restart reshape from the
8860 if (mddev_is_clustered(mddev
) &&
8861 mddev
->reshape_position
!= MaxSector
)
8862 j
= mddev
->reshape_position
;
8864 /* recovery follows the physical size of devices */
8865 max_sectors
= mddev
->dev_sectors
;
8868 rdev_for_each_rcu(rdev
, mddev
)
8869 if (rdev
->raid_disk
>= 0 &&
8870 !test_bit(Journal
, &rdev
->flags
) &&
8871 !test_bit(Faulty
, &rdev
->flags
) &&
8872 !test_bit(In_sync
, &rdev
->flags
) &&
8873 rdev
->recovery_offset
< j
)
8874 j
= rdev
->recovery_offset
;
8877 /* If there is a bitmap, we need to make sure all
8878 * writes that started before we added a spare
8879 * complete before we start doing a recovery.
8880 * Otherwise the write might complete and (via
8881 * bitmap_endwrite) set a bit in the bitmap after the
8882 * recovery has checked that bit and skipped that
8885 if (mddev
->bitmap
) {
8886 mddev
->pers
->quiesce(mddev
, 1);
8887 mddev
->pers
->quiesce(mddev
, 0);
8891 pr_info("md: %s of RAID array %s\n", desc
, mdname(mddev
));
8892 pr_debug("md: minimum _guaranteed_ speed: %d KB/sec/disk.\n", speed_min(mddev
));
8893 pr_debug("md: using maximum available idle IO bandwidth (but not more than %d KB/sec) for %s.\n",
8894 speed_max(mddev
), desc
);
8896 is_mddev_idle(mddev
, 1); /* this initializes IO event counters */
8899 for (m
= 0; m
< SYNC_MARKS
; m
++) {
8901 mark_cnt
[m
] = io_sectors
;
8904 mddev
->resync_mark
= mark
[last_mark
];
8905 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
8908 * Tune reconstruction:
8910 window
= 32 * (PAGE_SIZE
/ 512);
8911 pr_debug("md: using %dk window, over a total of %lluk.\n",
8912 window
/2, (unsigned long long)max_sectors
/2);
8914 atomic_set(&mddev
->recovery_active
, 0);
8918 pr_debug("md: resuming %s of %s from checkpoint.\n",
8919 desc
, mdname(mddev
));
8920 mddev
->curr_resync
= j
;
8922 mddev
->curr_resync
= MD_RESYNC_ACTIVE
; /* no longer delayed */
8923 mddev
->curr_resync_completed
= j
;
8924 sysfs_notify_dirent_safe(mddev
->sysfs_completed
);
8926 update_time
= jiffies
;
8928 blk_start_plug(&plug
);
8929 while (j
< max_sectors
) {
8934 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
8935 ((mddev
->curr_resync
> mddev
->curr_resync_completed
&&
8936 (mddev
->curr_resync
- mddev
->curr_resync_completed
)
8937 > (max_sectors
>> 4)) ||
8938 time_after_eq(jiffies
, update_time
+ UPDATE_FREQUENCY
) ||
8939 (j
- mddev
->curr_resync_completed
)*2
8940 >= mddev
->resync_max
- mddev
->curr_resync_completed
||
8941 mddev
->curr_resync_completed
> mddev
->resync_max
8943 /* time to update curr_resync_completed */
8944 wait_event(mddev
->recovery_wait
,
8945 atomic_read(&mddev
->recovery_active
) == 0);
8946 mddev
->curr_resync_completed
= j
;
8947 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) &&
8948 j
> mddev
->recovery_cp
)
8949 mddev
->recovery_cp
= j
;
8950 update_time
= jiffies
;
8951 set_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
8952 sysfs_notify_dirent_safe(mddev
->sysfs_completed
);
8955 while (j
>= mddev
->resync_max
&&
8956 !test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
8957 /* As this condition is controlled by user-space,
8958 * we can block indefinitely, so use '_interruptible'
8959 * to avoid triggering warnings.
8961 flush_signals(current
); /* just in case */
8962 wait_event_interruptible(mddev
->recovery_wait
,
8963 mddev
->resync_max
> j
8964 || test_bit(MD_RECOVERY_INTR
,
8968 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
8971 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
);
8973 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8977 if (!skipped
) { /* actual IO requested */
8978 io_sectors
+= sectors
;
8979 atomic_add(sectors
, &mddev
->recovery_active
);
8982 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
8986 if (j
> max_sectors
)
8987 /* when skipping, extra large numbers can be returned. */
8990 mddev
->curr_resync
= j
;
8991 mddev
->curr_mark_cnt
= io_sectors
;
8992 if (last_check
== 0)
8993 /* this is the earliest that rebuild will be
8994 * visible in /proc/mdstat
8998 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
9001 last_check
= io_sectors
;
9003 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
9005 int next
= (last_mark
+1) % SYNC_MARKS
;
9007 mddev
->resync_mark
= mark
[next
];
9008 mddev
->resync_mark_cnt
= mark_cnt
[next
];
9009 mark
[next
] = jiffies
;
9010 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
9014 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
9018 * this loop exits only if either when we are slower than
9019 * the 'hard' speed limit, or the system was IO-idle for
9021 * the system might be non-idle CPU-wise, but we only care
9022 * about not overloading the IO subsystem. (things like an
9023 * e2fsck being done on the RAID array should execute fast)
9027 recovery_done
= io_sectors
- atomic_read(&mddev
->recovery_active
);
9028 currspeed
= ((unsigned long)(recovery_done
- mddev
->resync_mark_cnt
))/2
9029 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
9031 if (currspeed
> speed_min(mddev
)) {
9032 if (currspeed
> speed_max(mddev
)) {
9036 if (!is_mddev_idle(mddev
, 0)) {
9038 * Give other IO more of a chance.
9039 * The faster the devices, the less we wait.
9041 wait_event(mddev
->recovery_wait
,
9042 !atomic_read(&mddev
->recovery_active
));
9046 pr_info("md: %s: %s %s.\n",mdname(mddev
), desc
,
9047 test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)
9048 ? "interrupted" : "done");
9050 * this also signals 'finished resyncing' to md_stop
9052 blk_finish_plug(&plug
);
9053 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
9055 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
9056 !test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
9057 mddev
->curr_resync
>= MD_RESYNC_ACTIVE
) {
9058 mddev
->curr_resync_completed
= mddev
->curr_resync
;
9059 sysfs_notify_dirent_safe(mddev
->sysfs_completed
);
9061 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
);
9063 if (!test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
) &&
9064 mddev
->curr_resync
>= MD_RESYNC_ACTIVE
) {
9065 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
9066 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
9067 if (mddev
->curr_resync
>= mddev
->recovery_cp
) {
9068 pr_debug("md: checkpointing %s of %s.\n",
9069 desc
, mdname(mddev
));
9070 if (test_bit(MD_RECOVERY_ERROR
,
9072 mddev
->recovery_cp
=
9073 mddev
->curr_resync_completed
;
9075 mddev
->recovery_cp
=
9079 mddev
->recovery_cp
= MaxSector
;
9081 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
9082 mddev
->curr_resync
= MaxSector
;
9083 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
9084 test_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
)) {
9086 rdev_for_each_rcu(rdev
, mddev
)
9087 if (rdev
->raid_disk
>= 0 &&
9088 mddev
->delta_disks
>= 0 &&
9089 !test_bit(Journal
, &rdev
->flags
) &&
9090 !test_bit(Faulty
, &rdev
->flags
) &&
9091 !test_bit(In_sync
, &rdev
->flags
) &&
9092 rdev
->recovery_offset
< mddev
->curr_resync
)
9093 rdev
->recovery_offset
= mddev
->curr_resync
;
9099 /* set CHANGE_PENDING here since maybe another update is needed,
9100 * so other nodes are informed. It should be harmless for normal
9102 set_mask_bits(&mddev
->sb_flags
, 0,
9103 BIT(MD_SB_CHANGE_PENDING
) | BIT(MD_SB_CHANGE_DEVS
));
9105 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
9106 !test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
9107 mddev
->delta_disks
> 0 &&
9108 mddev
->pers
->finish_reshape
&&
9109 mddev
->pers
->size
&&
9111 mddev_lock_nointr(mddev
);
9112 md_set_array_sectors(mddev
, mddev
->pers
->size(mddev
, 0, 0));
9113 mddev_unlock(mddev
);
9114 if (!mddev_is_clustered(mddev
))
9115 set_capacity_and_notify(mddev
->gendisk
,
9116 mddev
->array_sectors
);
9119 spin_lock(&mddev
->lock
);
9120 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
9121 /* We completed so min/max setting can be forgotten if used. */
9122 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
9123 mddev
->resync_min
= 0;
9124 mddev
->resync_max
= MaxSector
;
9125 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
9126 mddev
->resync_min
= mddev
->curr_resync_completed
;
9127 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
9128 mddev
->curr_resync
= MD_RESYNC_NONE
;
9129 spin_unlock(&mddev
->lock
);
9131 wake_up(&resync_wait
);
9132 md_wakeup_thread(mddev
->thread
);
9135 EXPORT_SYMBOL_GPL(md_do_sync
);
9137 static int remove_and_add_spares(struct mddev
*mddev
,
9138 struct md_rdev
*this)
9140 struct md_rdev
*rdev
;
9143 bool remove_some
= false;
9145 if (this && test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
9146 /* Mustn't remove devices when resync thread is running */
9149 rdev_for_each(rdev
, mddev
) {
9150 if ((this == NULL
|| rdev
== this) &&
9151 rdev
->raid_disk
>= 0 &&
9152 !test_bit(Blocked
, &rdev
->flags
) &&
9153 test_bit(Faulty
, &rdev
->flags
) &&
9154 atomic_read(&rdev
->nr_pending
)==0) {
9155 /* Faulty non-Blocked devices with nr_pending == 0
9156 * never get nr_pending incremented,
9157 * never get Faulty cleared, and never get Blocked set.
9158 * So we can synchronize_rcu now rather than once per device
9161 set_bit(RemoveSynchronized
, &rdev
->flags
);
9167 rdev_for_each(rdev
, mddev
) {
9168 if ((this == NULL
|| rdev
== this) &&
9169 rdev
->raid_disk
>= 0 &&
9170 !test_bit(Blocked
, &rdev
->flags
) &&
9171 ((test_bit(RemoveSynchronized
, &rdev
->flags
) ||
9172 (!test_bit(In_sync
, &rdev
->flags
) &&
9173 !test_bit(Journal
, &rdev
->flags
))) &&
9174 atomic_read(&rdev
->nr_pending
)==0)) {
9175 if (mddev
->pers
->hot_remove_disk(
9176 mddev
, rdev
) == 0) {
9177 sysfs_unlink_rdev(mddev
, rdev
);
9178 rdev
->saved_raid_disk
= rdev
->raid_disk
;
9179 rdev
->raid_disk
= -1;
9183 if (remove_some
&& test_bit(RemoveSynchronized
, &rdev
->flags
))
9184 clear_bit(RemoveSynchronized
, &rdev
->flags
);
9187 if (removed
&& mddev
->kobj
.sd
)
9188 sysfs_notify_dirent_safe(mddev
->sysfs_degraded
);
9190 if (this && removed
)
9193 rdev_for_each(rdev
, mddev
) {
9194 if (this && this != rdev
)
9196 if (test_bit(Candidate
, &rdev
->flags
))
9198 if (rdev
->raid_disk
>= 0 &&
9199 !test_bit(In_sync
, &rdev
->flags
) &&
9200 !test_bit(Journal
, &rdev
->flags
) &&
9201 !test_bit(Faulty
, &rdev
->flags
))
9203 if (rdev
->raid_disk
>= 0)
9205 if (test_bit(Faulty
, &rdev
->flags
))
9207 if (!test_bit(Journal
, &rdev
->flags
)) {
9209 ! (rdev
->saved_raid_disk
>= 0 &&
9210 !test_bit(Bitmap_sync
, &rdev
->flags
)))
9213 rdev
->recovery_offset
= 0;
9215 if (mddev
->pers
->hot_add_disk(mddev
, rdev
) == 0) {
9216 /* failure here is OK */
9217 sysfs_link_rdev(mddev
, rdev
);
9218 if (!test_bit(Journal
, &rdev
->flags
))
9221 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
9226 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
9230 static void md_start_sync(struct work_struct
*ws
)
9232 struct mddev
*mddev
= container_of(ws
, struct mddev
, del_work
);
9234 mddev
->sync_thread
= md_register_thread(md_do_sync
,
9237 if (!mddev
->sync_thread
) {
9238 pr_warn("%s: could not start resync thread...\n",
9240 /* leave the spares where they are, it shouldn't hurt */
9241 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
9242 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
9243 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
9244 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
9245 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
9246 wake_up(&resync_wait
);
9247 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
9249 if (mddev
->sysfs_action
)
9250 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
9252 md_wakeup_thread(mddev
->sync_thread
);
9253 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
9258 * This routine is regularly called by all per-raid-array threads to
9259 * deal with generic issues like resync and super-block update.
9260 * Raid personalities that don't have a thread (linear/raid0) do not
9261 * need this as they never do any recovery or update the superblock.
9263 * It does not do any resync itself, but rather "forks" off other threads
9264 * to do that as needed.
9265 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
9266 * "->recovery" and create a thread at ->sync_thread.
9267 * When the thread finishes it sets MD_RECOVERY_DONE
9268 * and wakeups up this thread which will reap the thread and finish up.
9269 * This thread also removes any faulty devices (with nr_pending == 0).
9271 * The overall approach is:
9272 * 1/ if the superblock needs updating, update it.
9273 * 2/ If a recovery thread is running, don't do anything else.
9274 * 3/ If recovery has finished, clean up, possibly marking spares active.
9275 * 4/ If there are any faulty devices, remove them.
9276 * 5/ If array is degraded, try to add spares devices
9277 * 6/ If array has spares or is not in-sync, start a resync thread.
9279 void md_check_recovery(struct mddev
*mddev
)
9281 if (test_bit(MD_ALLOW_SB_UPDATE
, &mddev
->flags
) && mddev
->sb_flags
) {
9282 /* Write superblock - thread that called mddev_suspend()
9283 * holds reconfig_mutex for us.
9285 set_bit(MD_UPDATING_SB
, &mddev
->flags
);
9286 smp_mb__after_atomic();
9287 if (test_bit(MD_ALLOW_SB_UPDATE
, &mddev
->flags
))
9288 md_update_sb(mddev
, 0);
9289 clear_bit_unlock(MD_UPDATING_SB
, &mddev
->flags
);
9290 wake_up(&mddev
->sb_wait
);
9293 if (mddev
->suspended
)
9297 md_bitmap_daemon_work(mddev
);
9299 if (signal_pending(current
)) {
9300 if (mddev
->pers
->sync_request
&& !mddev
->external
) {
9301 pr_debug("md: %s in immediate safe mode\n",
9303 mddev
->safemode
= 2;
9305 flush_signals(current
);
9308 if (mddev
->ro
&& !test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
9311 (mddev
->sb_flags
& ~ (1<<MD_SB_CHANGE_PENDING
)) ||
9312 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
9313 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
9314 (mddev
->external
== 0 && mddev
->safemode
== 1) ||
9315 (mddev
->safemode
== 2
9316 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
9320 if (mddev_trylock(mddev
)) {
9322 bool try_set_sync
= mddev
->safemode
!= 0;
9324 if (!mddev
->external
&& mddev
->safemode
== 1)
9325 mddev
->safemode
= 0;
9328 struct md_rdev
*rdev
;
9329 if (!mddev
->external
&& mddev
->in_sync
)
9330 /* 'Blocked' flag not needed as failed devices
9331 * will be recorded if array switched to read/write.
9332 * Leaving it set will prevent the device
9333 * from being removed.
9335 rdev_for_each(rdev
, mddev
)
9336 clear_bit(Blocked
, &rdev
->flags
);
9337 /* On a read-only array we can:
9338 * - remove failed devices
9339 * - add already-in_sync devices if the array itself
9341 * As we only add devices that are already in-sync,
9342 * we can activate the spares immediately.
9344 remove_and_add_spares(mddev
, NULL
);
9345 /* There is no thread, but we need to call
9346 * ->spare_active and clear saved_raid_disk
9348 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
9349 md_unregister_thread(&mddev
->sync_thread
);
9350 md_reap_sync_thread(mddev
);
9351 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
9352 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
9353 clear_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
9357 if (mddev_is_clustered(mddev
)) {
9358 struct md_rdev
*rdev
, *tmp
;
9359 /* kick the device if another node issued a
9362 rdev_for_each_safe(rdev
, tmp
, mddev
) {
9363 if (test_and_clear_bit(ClusterRemove
, &rdev
->flags
) &&
9364 rdev
->raid_disk
< 0)
9365 md_kick_rdev_from_array(rdev
);
9369 if (try_set_sync
&& !mddev
->external
&& !mddev
->in_sync
) {
9370 spin_lock(&mddev
->lock
);
9372 spin_unlock(&mddev
->lock
);
9375 if (mddev
->sb_flags
)
9376 md_update_sb(mddev
, 0);
9378 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
9379 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
9380 /* resync/recovery still happening */
9381 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
9384 if (mddev
->sync_thread
) {
9385 md_unregister_thread(&mddev
->sync_thread
);
9386 md_reap_sync_thread(mddev
);
9389 /* Set RUNNING before clearing NEEDED to avoid
9390 * any transients in the value of "sync_action".
9392 mddev
->curr_resync_completed
= 0;
9393 spin_lock(&mddev
->lock
);
9394 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
9395 spin_unlock(&mddev
->lock
);
9396 /* Clear some bits that don't mean anything, but
9399 clear_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
9400 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
9402 if (!test_and_clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
9403 test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
9405 /* no recovery is running.
9406 * remove any failed drives, then
9407 * add spares if possible.
9408 * Spares are also removed and re-added, to allow
9409 * the personality to fail the re-add.
9412 if (mddev
->reshape_position
!= MaxSector
) {
9413 if (mddev
->pers
->check_reshape
== NULL
||
9414 mddev
->pers
->check_reshape(mddev
) != 0)
9415 /* Cannot proceed */
9417 set_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
9418 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
9419 } else if ((spares
= remove_and_add_spares(mddev
, NULL
))) {
9420 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
9421 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
9422 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
9423 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
9424 } else if (mddev
->recovery_cp
< MaxSector
) {
9425 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
9426 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
9427 } else if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
9428 /* nothing to be done ... */
9431 if (mddev
->pers
->sync_request
) {
9433 /* We are adding a device or devices to an array
9434 * which has the bitmap stored on all devices.
9435 * So make sure all bitmap pages get written
9437 md_bitmap_write_all(mddev
->bitmap
);
9439 INIT_WORK(&mddev
->del_work
, md_start_sync
);
9440 queue_work(md_misc_wq
, &mddev
->del_work
);
9444 if (!mddev
->sync_thread
) {
9445 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
9446 wake_up(&resync_wait
);
9447 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
9449 if (mddev
->sysfs_action
)
9450 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
9453 wake_up(&mddev
->sb_wait
);
9454 mddev_unlock(mddev
);
9457 EXPORT_SYMBOL(md_check_recovery
);
9459 void md_reap_sync_thread(struct mddev
*mddev
)
9461 struct md_rdev
*rdev
;
9462 sector_t old_dev_sectors
= mddev
->dev_sectors
;
9463 bool is_reshaped
= false;
9465 /* sync_thread should be unregistered, collect result */
9466 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
9467 !test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
) &&
9468 mddev
->degraded
!= mddev
->raid_disks
) {
9470 /* activate any spares */
9471 if (mddev
->pers
->spare_active(mddev
)) {
9472 sysfs_notify_dirent_safe(mddev
->sysfs_degraded
);
9473 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
9476 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
9477 mddev
->pers
->finish_reshape
) {
9478 mddev
->pers
->finish_reshape(mddev
);
9479 if (mddev_is_clustered(mddev
))
9483 /* If array is no-longer degraded, then any saved_raid_disk
9484 * information must be scrapped.
9486 if (!mddev
->degraded
)
9487 rdev_for_each(rdev
, mddev
)
9488 rdev
->saved_raid_disk
= -1;
9490 md_update_sb(mddev
, 1);
9491 /* MD_SB_CHANGE_PENDING should be cleared by md_update_sb, so we can
9492 * call resync_finish here if MD_CLUSTER_RESYNC_LOCKED is set by
9494 if (test_and_clear_bit(MD_CLUSTER_RESYNC_LOCKED
, &mddev
->flags
))
9495 md_cluster_ops
->resync_finish(mddev
);
9496 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
9497 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
9498 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
9499 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
9500 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
9501 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
9503 * We call md_cluster_ops->update_size here because sync_size could
9504 * be changed by md_update_sb, and MD_RECOVERY_RESHAPE is cleared,
9505 * so it is time to update size across cluster.
9507 if (mddev_is_clustered(mddev
) && is_reshaped
9508 && !test_bit(MD_CLOSING
, &mddev
->flags
))
9509 md_cluster_ops
->update_size(mddev
, old_dev_sectors
);
9510 wake_up(&resync_wait
);
9511 /* flag recovery needed just to double check */
9512 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
9513 sysfs_notify_dirent_safe(mddev
->sysfs_completed
);
9514 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
9516 if (mddev
->event_work
.func
)
9517 queue_work(md_misc_wq
, &mddev
->event_work
);
9519 EXPORT_SYMBOL(md_reap_sync_thread
);
9521 void md_wait_for_blocked_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
9523 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
9524 wait_event_timeout(rdev
->blocked_wait
,
9525 !test_bit(Blocked
, &rdev
->flags
) &&
9526 !test_bit(BlockedBadBlocks
, &rdev
->flags
),
9527 msecs_to_jiffies(5000));
9528 rdev_dec_pending(rdev
, mddev
);
9530 EXPORT_SYMBOL(md_wait_for_blocked_rdev
);
9532 void md_finish_reshape(struct mddev
*mddev
)
9534 /* called be personality module when reshape completes. */
9535 struct md_rdev
*rdev
;
9537 rdev_for_each(rdev
, mddev
) {
9538 if (rdev
->data_offset
> rdev
->new_data_offset
)
9539 rdev
->sectors
+= rdev
->data_offset
- rdev
->new_data_offset
;
9541 rdev
->sectors
-= rdev
->new_data_offset
- rdev
->data_offset
;
9542 rdev
->data_offset
= rdev
->new_data_offset
;
9545 EXPORT_SYMBOL(md_finish_reshape
);
9547 /* Bad block management */
9549 /* Returns 1 on success, 0 on failure */
9550 int rdev_set_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
9553 struct mddev
*mddev
= rdev
->mddev
;
9556 s
+= rdev
->new_data_offset
;
9558 s
+= rdev
->data_offset
;
9559 rv
= badblocks_set(&rdev
->badblocks
, s
, sectors
, 0);
9561 /* Make sure they get written out promptly */
9562 if (test_bit(ExternalBbl
, &rdev
->flags
))
9563 sysfs_notify_dirent_safe(rdev
->sysfs_unack_badblocks
);
9564 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
9565 set_mask_bits(&mddev
->sb_flags
, 0,
9566 BIT(MD_SB_CHANGE_CLEAN
) | BIT(MD_SB_CHANGE_PENDING
));
9567 md_wakeup_thread(rdev
->mddev
->thread
);
9572 EXPORT_SYMBOL_GPL(rdev_set_badblocks
);
9574 int rdev_clear_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
9579 s
+= rdev
->new_data_offset
;
9581 s
+= rdev
->data_offset
;
9582 rv
= badblocks_clear(&rdev
->badblocks
, s
, sectors
);
9583 if ((rv
== 0) && test_bit(ExternalBbl
, &rdev
->flags
))
9584 sysfs_notify_dirent_safe(rdev
->sysfs_badblocks
);
9587 EXPORT_SYMBOL_GPL(rdev_clear_badblocks
);
9589 static int md_notify_reboot(struct notifier_block
*this,
9590 unsigned long code
, void *x
)
9592 struct list_head
*tmp
;
9593 struct mddev
*mddev
;
9596 for_each_mddev(mddev
, tmp
) {
9597 if (mddev_trylock(mddev
)) {
9599 __md_stop_writes(mddev
);
9600 if (mddev
->persistent
)
9601 mddev
->safemode
= 2;
9602 mddev_unlock(mddev
);
9607 * certain more exotic SCSI devices are known to be
9608 * volatile wrt too early system reboots. While the
9609 * right place to handle this issue is the given
9610 * driver, we do want to have a safe RAID driver ...
9618 static struct notifier_block md_notifier
= {
9619 .notifier_call
= md_notify_reboot
,
9621 .priority
= INT_MAX
, /* before any real devices */
9624 static void md_geninit(void)
9626 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
9628 proc_create("mdstat", S_IRUGO
, NULL
, &mdstat_proc_ops
);
9631 static int __init
md_init(void)
9635 md_wq
= alloc_workqueue("md", WQ_MEM_RECLAIM
, 0);
9639 md_misc_wq
= alloc_workqueue("md_misc", 0, 0);
9643 md_rdev_misc_wq
= alloc_workqueue("md_rdev_misc", 0, 0);
9644 if (!md_rdev_misc_wq
)
9645 goto err_rdev_misc_wq
;
9647 ret
= __register_blkdev(MD_MAJOR
, "md", md_probe
);
9651 ret
= __register_blkdev(0, "mdp", md_probe
);
9656 register_reboot_notifier(&md_notifier
);
9657 raid_table_header
= register_sysctl_table(raid_root_table
);
9663 unregister_blkdev(MD_MAJOR
, "md");
9665 destroy_workqueue(md_rdev_misc_wq
);
9667 destroy_workqueue(md_misc_wq
);
9669 destroy_workqueue(md_wq
);
9674 static void check_sb_changes(struct mddev
*mddev
, struct md_rdev
*rdev
)
9676 struct mdp_superblock_1
*sb
= page_address(rdev
->sb_page
);
9677 struct md_rdev
*rdev2
, *tmp
;
9681 * If size is changed in another node then we need to
9682 * do resize as well.
9684 if (mddev
->dev_sectors
!= le64_to_cpu(sb
->size
)) {
9685 ret
= mddev
->pers
->resize(mddev
, le64_to_cpu(sb
->size
));
9687 pr_info("md-cluster: resize failed\n");
9689 md_bitmap_update_sb(mddev
->bitmap
);
9692 /* Check for change of roles in the active devices */
9693 rdev_for_each_safe(rdev2
, tmp
, mddev
) {
9694 if (test_bit(Faulty
, &rdev2
->flags
))
9697 /* Check if the roles changed */
9698 role
= le16_to_cpu(sb
->dev_roles
[rdev2
->desc_nr
]);
9700 if (test_bit(Candidate
, &rdev2
->flags
)) {
9701 if (role
== MD_DISK_ROLE_FAULTY
) {
9702 pr_info("md: Removing Candidate device %pg because add failed\n",
9704 md_kick_rdev_from_array(rdev2
);
9708 clear_bit(Candidate
, &rdev2
->flags
);
9711 if (role
!= rdev2
->raid_disk
) {
9713 * got activated except reshape is happening.
9715 if (rdev2
->raid_disk
== -1 && role
!= MD_DISK_ROLE_SPARE
&&
9716 !(le32_to_cpu(sb
->feature_map
) &
9717 MD_FEATURE_RESHAPE_ACTIVE
)) {
9718 rdev2
->saved_raid_disk
= role
;
9719 ret
= remove_and_add_spares(mddev
, rdev2
);
9720 pr_info("Activated spare: %pg\n",
9722 /* wakeup mddev->thread here, so array could
9723 * perform resync with the new activated disk */
9724 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
9725 md_wakeup_thread(mddev
->thread
);
9728 * We just want to do the minimum to mark the disk
9729 * as faulty. The recovery is performed by the
9730 * one who initiated the error.
9732 if (role
== MD_DISK_ROLE_FAULTY
||
9733 role
== MD_DISK_ROLE_JOURNAL
) {
9734 md_error(mddev
, rdev2
);
9735 clear_bit(Blocked
, &rdev2
->flags
);
9740 if (mddev
->raid_disks
!= le32_to_cpu(sb
->raid_disks
)) {
9741 ret
= update_raid_disks(mddev
, le32_to_cpu(sb
->raid_disks
));
9743 pr_warn("md: updating array disks failed. %d\n", ret
);
9747 * Since mddev->delta_disks has already updated in update_raid_disks,
9748 * so it is time to check reshape.
9750 if (test_bit(MD_RESYNCING_REMOTE
, &mddev
->recovery
) &&
9751 (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
9753 * reshape is happening in the remote node, we need to
9754 * update reshape_position and call start_reshape.
9756 mddev
->reshape_position
= le64_to_cpu(sb
->reshape_position
);
9757 if (mddev
->pers
->update_reshape_pos
)
9758 mddev
->pers
->update_reshape_pos(mddev
);
9759 if (mddev
->pers
->start_reshape
)
9760 mddev
->pers
->start_reshape(mddev
);
9761 } else if (test_bit(MD_RESYNCING_REMOTE
, &mddev
->recovery
) &&
9762 mddev
->reshape_position
!= MaxSector
&&
9763 !(le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
9764 /* reshape is just done in another node. */
9765 mddev
->reshape_position
= MaxSector
;
9766 if (mddev
->pers
->update_reshape_pos
)
9767 mddev
->pers
->update_reshape_pos(mddev
);
9770 /* Finally set the event to be up to date */
9771 mddev
->events
= le64_to_cpu(sb
->events
);
9774 static int read_rdev(struct mddev
*mddev
, struct md_rdev
*rdev
)
9777 struct page
*swapout
= rdev
->sb_page
;
9778 struct mdp_superblock_1
*sb
;
9780 /* Store the sb page of the rdev in the swapout temporary
9781 * variable in case we err in the future
9783 rdev
->sb_page
= NULL
;
9784 err
= alloc_disk_sb(rdev
);
9786 ClearPageUptodate(rdev
->sb_page
);
9787 rdev
->sb_loaded
= 0;
9788 err
= super_types
[mddev
->major_version
].
9789 load_super(rdev
, NULL
, mddev
->minor_version
);
9792 pr_warn("%s: %d Could not reload rdev(%d) err: %d. Restoring old values\n",
9793 __func__
, __LINE__
, rdev
->desc_nr
, err
);
9795 put_page(rdev
->sb_page
);
9796 rdev
->sb_page
= swapout
;
9797 rdev
->sb_loaded
= 1;
9801 sb
= page_address(rdev
->sb_page
);
9802 /* Read the offset unconditionally, even if MD_FEATURE_RECOVERY_OFFSET
9806 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RECOVERY_OFFSET
))
9807 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
9809 /* The other node finished recovery, call spare_active to set
9810 * device In_sync and mddev->degraded
9812 if (rdev
->recovery_offset
== MaxSector
&&
9813 !test_bit(In_sync
, &rdev
->flags
) &&
9814 mddev
->pers
->spare_active(mddev
))
9815 sysfs_notify_dirent_safe(mddev
->sysfs_degraded
);
9821 void md_reload_sb(struct mddev
*mddev
, int nr
)
9823 struct md_rdev
*rdev
= NULL
, *iter
;
9827 rdev_for_each_rcu(iter
, mddev
) {
9828 if (iter
->desc_nr
== nr
) {
9835 pr_warn("%s: %d Could not find rdev with nr %d\n", __func__
, __LINE__
, nr
);
9839 err
= read_rdev(mddev
, rdev
);
9843 check_sb_changes(mddev
, rdev
);
9845 /* Read all rdev's to update recovery_offset */
9846 rdev_for_each_rcu(rdev
, mddev
) {
9847 if (!test_bit(Faulty
, &rdev
->flags
))
9848 read_rdev(mddev
, rdev
);
9851 EXPORT_SYMBOL(md_reload_sb
);
9856 * Searches all registered partitions for autorun RAID arrays
9860 static DEFINE_MUTEX(detected_devices_mutex
);
9861 static LIST_HEAD(all_detected_devices
);
9862 struct detected_devices_node
{
9863 struct list_head list
;
9867 void md_autodetect_dev(dev_t dev
)
9869 struct detected_devices_node
*node_detected_dev
;
9871 node_detected_dev
= kzalloc(sizeof(*node_detected_dev
), GFP_KERNEL
);
9872 if (node_detected_dev
) {
9873 node_detected_dev
->dev
= dev
;
9874 mutex_lock(&detected_devices_mutex
);
9875 list_add_tail(&node_detected_dev
->list
, &all_detected_devices
);
9876 mutex_unlock(&detected_devices_mutex
);
9880 void md_autostart_arrays(int part
)
9882 struct md_rdev
*rdev
;
9883 struct detected_devices_node
*node_detected_dev
;
9885 int i_scanned
, i_passed
;
9890 pr_info("md: Autodetecting RAID arrays.\n");
9892 mutex_lock(&detected_devices_mutex
);
9893 while (!list_empty(&all_detected_devices
) && i_scanned
< INT_MAX
) {
9895 node_detected_dev
= list_entry(all_detected_devices
.next
,
9896 struct detected_devices_node
, list
);
9897 list_del(&node_detected_dev
->list
);
9898 dev
= node_detected_dev
->dev
;
9899 kfree(node_detected_dev
);
9900 mutex_unlock(&detected_devices_mutex
);
9901 rdev
= md_import_device(dev
,0, 90);
9902 mutex_lock(&detected_devices_mutex
);
9906 if (test_bit(Faulty
, &rdev
->flags
))
9909 set_bit(AutoDetected
, &rdev
->flags
);
9910 list_add(&rdev
->same_set
, &pending_raid_disks
);
9913 mutex_unlock(&detected_devices_mutex
);
9915 pr_debug("md: Scanned %d and added %d devices.\n", i_scanned
, i_passed
);
9917 autorun_devices(part
);
9920 #endif /* !MODULE */
9922 static __exit
void md_exit(void)
9924 struct mddev
*mddev
;
9925 struct list_head
*tmp
;
9928 unregister_blkdev(MD_MAJOR
,"md");
9929 unregister_blkdev(mdp_major
, "mdp");
9930 unregister_reboot_notifier(&md_notifier
);
9931 unregister_sysctl_table(raid_table_header
);
9933 /* We cannot unload the modules while some process is
9934 * waiting for us in select() or poll() - wake them up
9937 while (waitqueue_active(&md_event_waiters
)) {
9938 /* not safe to leave yet */
9939 wake_up(&md_event_waiters
);
9943 remove_proc_entry("mdstat", NULL
);
9945 for_each_mddev(mddev
, tmp
) {
9946 export_array(mddev
);
9948 mddev
->hold_active
= 0;
9950 * for_each_mddev() will call mddev_put() at the end of each
9951 * iteration. As the mddev is now fully clear, this will
9952 * schedule the mddev for destruction by a workqueue, and the
9953 * destroy_workqueue() below will wait for that to complete.
9956 destroy_workqueue(md_rdev_misc_wq
);
9957 destroy_workqueue(md_misc_wq
);
9958 destroy_workqueue(md_wq
);
9961 subsys_initcall(md_init
);
9962 module_exit(md_exit
)
9964 static int get_ro(char *buffer
, const struct kernel_param
*kp
)
9966 return sprintf(buffer
, "%d\n", start_readonly
);
9968 static int set_ro(const char *val
, const struct kernel_param
*kp
)
9970 return kstrtouint(val
, 10, (unsigned int *)&start_readonly
);
9973 module_param_call(start_ro
, set_ro
, get_ro
, NULL
, S_IRUSR
|S_IWUSR
);
9974 module_param(start_dirty_degraded
, int, S_IRUGO
|S_IWUSR
);
9975 module_param_call(new_array
, add_named_array
, NULL
, NULL
, S_IWUSR
);
9976 module_param(create_on_open
, bool, S_IRUSR
|S_IWUSR
);
9978 MODULE_LICENSE("GPL");
9979 MODULE_DESCRIPTION("MD RAID framework");
9981 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);