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/badblocks.h>
45 #include <linux/sysctl.h>
46 #include <linux/seq_file.h>
48 #include <linux/poll.h>
49 #include <linux/ctype.h>
50 #include <linux/string.h>
51 #include <linux/hdreg.h>
52 #include <linux/proc_fs.h>
53 #include <linux/random.h>
54 #include <linux/module.h>
55 #include <linux/reboot.h>
56 #include <linux/file.h>
57 #include <linux/compat.h>
58 #include <linux/delay.h>
59 #include <linux/raid/md_p.h>
60 #include <linux/raid/md_u.h>
61 #include <linux/raid/detect.h>
62 #include <linux/slab.h>
63 #include <linux/percpu-refcount.h>
64 #include <linux/part_stat.h>
66 #include <trace/events/block.h>
68 #include "md-bitmap.h"
69 #include "md-cluster.h"
71 /* pers_list is a list of registered personalities protected
73 * pers_lock does extra service to protect accesses to
74 * mddev->thread when the mutex cannot be held.
76 static LIST_HEAD(pers_list
);
77 static DEFINE_SPINLOCK(pers_lock
);
79 static struct kobj_type md_ktype
;
81 struct md_cluster_operations
*md_cluster_ops
;
82 EXPORT_SYMBOL(md_cluster_ops
);
83 static struct module
*md_cluster_mod
;
85 static DECLARE_WAIT_QUEUE_HEAD(resync_wait
);
86 static struct workqueue_struct
*md_wq
;
87 static struct workqueue_struct
*md_misc_wq
;
88 static struct workqueue_struct
*md_rdev_misc_wq
;
90 static int remove_and_add_spares(struct mddev
*mddev
,
91 struct md_rdev
*this);
92 static void mddev_detach(struct mddev
*mddev
);
95 * Default number of read corrections we'll attempt on an rdev
96 * before ejecting it from the array. We divide the read error
97 * count by 2 for every hour elapsed between read errors.
99 #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
100 /* Default safemode delay: 200 msec */
101 #define DEFAULT_SAFEMODE_DELAY ((200 * HZ)/1000 +1)
103 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
104 * is 1000 KB/sec, so the extra system load does not show up that much.
105 * Increase it if you want to have more _guaranteed_ speed. Note that
106 * the RAID driver will use the maximum available bandwidth if the IO
107 * subsystem is idle. There is also an 'absolute maximum' reconstruction
108 * speed limit - in case reconstruction slows down your system despite
111 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
112 * or /sys/block/mdX/md/sync_speed_{min,max}
115 static int sysctl_speed_limit_min
= 1000;
116 static int sysctl_speed_limit_max
= 200000;
117 static inline int speed_min(struct mddev
*mddev
)
119 return mddev
->sync_speed_min
?
120 mddev
->sync_speed_min
: sysctl_speed_limit_min
;
123 static inline int speed_max(struct mddev
*mddev
)
125 return mddev
->sync_speed_max
?
126 mddev
->sync_speed_max
: sysctl_speed_limit_max
;
129 static void rdev_uninit_serial(struct md_rdev
*rdev
)
131 if (!test_and_clear_bit(CollisionCheck
, &rdev
->flags
))
134 kvfree(rdev
->serial
);
138 static void rdevs_uninit_serial(struct mddev
*mddev
)
140 struct md_rdev
*rdev
;
142 rdev_for_each(rdev
, mddev
)
143 rdev_uninit_serial(rdev
);
146 static int rdev_init_serial(struct md_rdev
*rdev
)
148 /* serial_nums equals with BARRIER_BUCKETS_NR */
149 int i
, serial_nums
= 1 << ((PAGE_SHIFT
- ilog2(sizeof(atomic_t
))));
150 struct serial_in_rdev
*serial
= NULL
;
152 if (test_bit(CollisionCheck
, &rdev
->flags
))
155 serial
= kvmalloc(sizeof(struct serial_in_rdev
) * serial_nums
,
160 for (i
= 0; i
< serial_nums
; i
++) {
161 struct serial_in_rdev
*serial_tmp
= &serial
[i
];
163 spin_lock_init(&serial_tmp
->serial_lock
);
164 serial_tmp
->serial_rb
= RB_ROOT_CACHED
;
165 init_waitqueue_head(&serial_tmp
->serial_io_wait
);
168 rdev
->serial
= serial
;
169 set_bit(CollisionCheck
, &rdev
->flags
);
174 static int rdevs_init_serial(struct mddev
*mddev
)
176 struct md_rdev
*rdev
;
179 rdev_for_each(rdev
, mddev
) {
180 ret
= rdev_init_serial(rdev
);
185 /* Free all resources if pool is not existed */
186 if (ret
&& !mddev
->serial_info_pool
)
187 rdevs_uninit_serial(mddev
);
193 * rdev needs to enable serial stuffs if it meets the conditions:
194 * 1. it is multi-queue device flaged with writemostly.
195 * 2. the write-behind mode is enabled.
197 static int rdev_need_serial(struct md_rdev
*rdev
)
199 return (rdev
&& rdev
->mddev
->bitmap_info
.max_write_behind
> 0 &&
200 rdev
->bdev
->bd_disk
->queue
->nr_hw_queues
!= 1 &&
201 test_bit(WriteMostly
, &rdev
->flags
));
205 * Init resource for rdev(s), then create serial_info_pool if:
206 * 1. rdev is the first device which return true from rdev_enable_serial.
207 * 2. rdev is NULL, means we want to enable serialization for all rdevs.
209 void mddev_create_serial_pool(struct mddev
*mddev
, struct md_rdev
*rdev
,
214 if (rdev
&& !rdev_need_serial(rdev
) &&
215 !test_bit(CollisionCheck
, &rdev
->flags
))
219 mddev_suspend(mddev
);
222 ret
= rdevs_init_serial(mddev
);
224 ret
= rdev_init_serial(rdev
);
228 if (mddev
->serial_info_pool
== NULL
) {
230 * already in memalloc noio context by
233 mddev
->serial_info_pool
=
234 mempool_create_kmalloc_pool(NR_SERIAL_INFOS
,
235 sizeof(struct serial_info
));
236 if (!mddev
->serial_info_pool
) {
237 rdevs_uninit_serial(mddev
);
238 pr_err("can't alloc memory pool for serialization\n");
248 * Free resource from rdev(s), and destroy serial_info_pool under conditions:
249 * 1. rdev is the last device flaged with CollisionCheck.
250 * 2. when bitmap is destroyed while policy is not enabled.
251 * 3. for disable policy, the pool is destroyed only when no rdev needs it.
253 void mddev_destroy_serial_pool(struct mddev
*mddev
, struct md_rdev
*rdev
,
256 if (rdev
&& !test_bit(CollisionCheck
, &rdev
->flags
))
259 if (mddev
->serial_info_pool
) {
260 struct md_rdev
*temp
;
261 int num
= 0; /* used to track if other rdevs need the pool */
264 mddev_suspend(mddev
);
265 rdev_for_each(temp
, mddev
) {
267 if (!mddev
->serialize_policy
||
268 !rdev_need_serial(temp
))
269 rdev_uninit_serial(temp
);
272 } else if (temp
!= rdev
&&
273 test_bit(CollisionCheck
, &temp
->flags
))
278 rdev_uninit_serial(rdev
);
281 pr_info("The mempool could be used by other devices\n");
283 mempool_destroy(mddev
->serial_info_pool
);
284 mddev
->serial_info_pool
= NULL
;
291 static struct ctl_table_header
*raid_table_header
;
293 static struct ctl_table raid_table
[] = {
295 .procname
= "speed_limit_min",
296 .data
= &sysctl_speed_limit_min
,
297 .maxlen
= sizeof(int),
298 .mode
= S_IRUGO
|S_IWUSR
,
299 .proc_handler
= proc_dointvec
,
302 .procname
= "speed_limit_max",
303 .data
= &sysctl_speed_limit_max
,
304 .maxlen
= sizeof(int),
305 .mode
= S_IRUGO
|S_IWUSR
,
306 .proc_handler
= proc_dointvec
,
311 static struct ctl_table raid_dir_table
[] = {
315 .mode
= S_IRUGO
|S_IXUGO
,
321 static struct ctl_table raid_root_table
[] = {
326 .child
= raid_dir_table
,
331 static int start_readonly
;
334 * The original mechanism for creating an md device is to create
335 * a device node in /dev and to open it. This causes races with device-close.
336 * The preferred method is to write to the "new_array" module parameter.
337 * This can avoid races.
338 * Setting create_on_open to false disables the original mechanism
339 * so all the races disappear.
341 static bool create_on_open
= true;
344 * We have a system wide 'event count' that is incremented
345 * on any 'interesting' event, and readers of /proc/mdstat
346 * can use 'poll' or 'select' to find out when the event
350 * start array, stop array, error, add device, remove device,
351 * start build, activate spare
353 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters
);
354 static atomic_t md_event_count
;
355 void md_new_event(struct mddev
*mddev
)
357 atomic_inc(&md_event_count
);
358 wake_up(&md_event_waiters
);
360 EXPORT_SYMBOL_GPL(md_new_event
);
363 * Enables to iterate over all existing md arrays
364 * all_mddevs_lock protects this list.
366 static LIST_HEAD(all_mddevs
);
367 static DEFINE_SPINLOCK(all_mddevs_lock
);
370 * iterates through all used mddevs in the system.
371 * We take care to grab the all_mddevs_lock whenever navigating
372 * the list, and to always hold a refcount when unlocked.
373 * Any code which breaks out of this loop while own
374 * a reference to the current mddev and must mddev_put it.
376 #define for_each_mddev(_mddev,_tmp) \
378 for (({ spin_lock(&all_mddevs_lock); \
379 _tmp = all_mddevs.next; \
381 ({ if (_tmp != &all_mddevs) \
382 mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\
383 spin_unlock(&all_mddevs_lock); \
384 if (_mddev) mddev_put(_mddev); \
385 _mddev = list_entry(_tmp, struct mddev, all_mddevs); \
386 _tmp != &all_mddevs;}); \
387 ({ spin_lock(&all_mddevs_lock); \
388 _tmp = _tmp->next;}) \
391 /* Rather than calling directly into the personality make_request function,
392 * IO requests come here first so that we can check if the device is
393 * being suspended pending a reconfiguration.
394 * We hold a refcount over the call to ->make_request. By the time that
395 * call has finished, the bio has been linked into some internal structure
396 * and so is visible to ->quiesce(), so we don't need the refcount any more.
398 static bool is_suspended(struct mddev
*mddev
, struct bio
*bio
)
400 if (mddev
->suspended
)
402 if (bio_data_dir(bio
) != WRITE
)
404 if (mddev
->suspend_lo
>= mddev
->suspend_hi
)
406 if (bio
->bi_iter
.bi_sector
>= mddev
->suspend_hi
)
408 if (bio_end_sector(bio
) < mddev
->suspend_lo
)
413 void md_handle_request(struct mddev
*mddev
, struct bio
*bio
)
417 if (is_suspended(mddev
, bio
)) {
420 prepare_to_wait(&mddev
->sb_wait
, &__wait
,
421 TASK_UNINTERRUPTIBLE
);
422 if (!is_suspended(mddev
, bio
))
428 finish_wait(&mddev
->sb_wait
, &__wait
);
430 atomic_inc(&mddev
->active_io
);
433 if (!mddev
->pers
->make_request(mddev
, bio
)) {
434 atomic_dec(&mddev
->active_io
);
435 wake_up(&mddev
->sb_wait
);
436 goto check_suspended
;
439 if (atomic_dec_and_test(&mddev
->active_io
) && mddev
->suspended
)
440 wake_up(&mddev
->sb_wait
);
442 EXPORT_SYMBOL(md_handle_request
);
446 bio_end_io_t
*orig_bi_end_io
;
447 void *orig_bi_private
;
448 struct block_device
*orig_bi_bdev
;
449 unsigned long start_time
;
452 static void md_end_io(struct bio
*bio
)
454 struct md_io
*md_io
= bio
->bi_private
;
455 struct mddev
*mddev
= md_io
->mddev
;
457 bio_end_io_acct_remapped(bio
, md_io
->start_time
, md_io
->orig_bi_bdev
);
459 bio
->bi_end_io
= md_io
->orig_bi_end_io
;
460 bio
->bi_private
= md_io
->orig_bi_private
;
462 mempool_free(md_io
, &mddev
->md_io_pool
);
468 static blk_qc_t
md_submit_bio(struct bio
*bio
)
470 const int rw
= bio_data_dir(bio
);
471 struct mddev
*mddev
= bio
->bi_bdev
->bd_disk
->private_data
;
473 if (mddev
== NULL
|| mddev
->pers
== NULL
) {
475 return BLK_QC_T_NONE
;
478 if (unlikely(test_bit(MD_BROKEN
, &mddev
->flags
)) && (rw
== WRITE
)) {
480 return BLK_QC_T_NONE
;
483 blk_queue_split(&bio
);
485 if (mddev
->ro
== 1 && unlikely(rw
== WRITE
)) {
486 if (bio_sectors(bio
) != 0)
487 bio
->bi_status
= BLK_STS_IOERR
;
489 return BLK_QC_T_NONE
;
492 if (bio
->bi_end_io
!= md_end_io
) {
495 md_io
= mempool_alloc(&mddev
->md_io_pool
, GFP_NOIO
);
496 md_io
->mddev
= mddev
;
497 md_io
->orig_bi_end_io
= bio
->bi_end_io
;
498 md_io
->orig_bi_private
= bio
->bi_private
;
499 md_io
->orig_bi_bdev
= bio
->bi_bdev
;
501 bio
->bi_end_io
= md_end_io
;
502 bio
->bi_private
= md_io
;
504 md_io
->start_time
= bio_start_io_acct(bio
);
507 /* bio could be mergeable after passing to underlayer */
508 bio
->bi_opf
&= ~REQ_NOMERGE
;
510 md_handle_request(mddev
, bio
);
512 return BLK_QC_T_NONE
;
515 /* mddev_suspend makes sure no new requests are submitted
516 * to the device, and that any requests that have been submitted
517 * are completely handled.
518 * Once mddev_detach() is called and completes, the module will be
521 void mddev_suspend(struct mddev
*mddev
)
523 WARN_ON_ONCE(mddev
->thread
&& current
== mddev
->thread
->tsk
);
524 lockdep_assert_held(&mddev
->reconfig_mutex
);
525 if (mddev
->suspended
++)
528 wake_up(&mddev
->sb_wait
);
529 set_bit(MD_ALLOW_SB_UPDATE
, &mddev
->flags
);
530 smp_mb__after_atomic();
531 wait_event(mddev
->sb_wait
, atomic_read(&mddev
->active_io
) == 0);
532 mddev
->pers
->quiesce(mddev
, 1);
533 clear_bit_unlock(MD_ALLOW_SB_UPDATE
, &mddev
->flags
);
534 wait_event(mddev
->sb_wait
, !test_bit(MD_UPDATING_SB
, &mddev
->flags
));
536 del_timer_sync(&mddev
->safemode_timer
);
537 /* restrict memory reclaim I/O during raid array is suspend */
538 mddev
->noio_flag
= memalloc_noio_save();
540 EXPORT_SYMBOL_GPL(mddev_suspend
);
542 void mddev_resume(struct mddev
*mddev
)
544 /* entred the memalloc scope from mddev_suspend() */
545 memalloc_noio_restore(mddev
->noio_flag
);
546 lockdep_assert_held(&mddev
->reconfig_mutex
);
547 if (--mddev
->suspended
)
549 wake_up(&mddev
->sb_wait
);
550 mddev
->pers
->quiesce(mddev
, 0);
552 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
553 md_wakeup_thread(mddev
->thread
);
554 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
556 EXPORT_SYMBOL_GPL(mddev_resume
);
559 * Generic flush handling for md
562 static void md_end_flush(struct bio
*bio
)
564 struct md_rdev
*rdev
= bio
->bi_private
;
565 struct mddev
*mddev
= rdev
->mddev
;
567 rdev_dec_pending(rdev
, mddev
);
569 if (atomic_dec_and_test(&mddev
->flush_pending
)) {
570 /* The pre-request flush has finished */
571 queue_work(md_wq
, &mddev
->flush_work
);
576 static void md_submit_flush_data(struct work_struct
*ws
);
578 static void submit_flushes(struct work_struct
*ws
)
580 struct mddev
*mddev
= container_of(ws
, struct mddev
, flush_work
);
581 struct md_rdev
*rdev
;
583 mddev
->start_flush
= ktime_get_boottime();
584 INIT_WORK(&mddev
->flush_work
, md_submit_flush_data
);
585 atomic_set(&mddev
->flush_pending
, 1);
587 rdev_for_each_rcu(rdev
, mddev
)
588 if (rdev
->raid_disk
>= 0 &&
589 !test_bit(Faulty
, &rdev
->flags
)) {
590 /* Take two references, one is dropped
591 * when request finishes, one after
592 * we reclaim rcu_read_lock
595 atomic_inc(&rdev
->nr_pending
);
596 atomic_inc(&rdev
->nr_pending
);
598 bi
= bio_alloc_bioset(GFP_NOIO
, 0, &mddev
->bio_set
);
599 bi
->bi_end_io
= md_end_flush
;
600 bi
->bi_private
= rdev
;
601 bio_set_dev(bi
, rdev
->bdev
);
602 bi
->bi_opf
= REQ_OP_WRITE
| REQ_PREFLUSH
;
603 atomic_inc(&mddev
->flush_pending
);
606 rdev_dec_pending(rdev
, mddev
);
609 if (atomic_dec_and_test(&mddev
->flush_pending
))
610 queue_work(md_wq
, &mddev
->flush_work
);
613 static void md_submit_flush_data(struct work_struct
*ws
)
615 struct mddev
*mddev
= container_of(ws
, struct mddev
, flush_work
);
616 struct bio
*bio
= mddev
->flush_bio
;
619 * must reset flush_bio before calling into md_handle_request to avoid a
620 * deadlock, because other bios passed md_handle_request suspend check
621 * could wait for this and below md_handle_request could wait for those
622 * bios because of suspend check
624 spin_lock_irq(&mddev
->lock
);
625 mddev
->prev_flush_start
= mddev
->start_flush
;
626 mddev
->flush_bio
= NULL
;
627 spin_unlock_irq(&mddev
->lock
);
628 wake_up(&mddev
->sb_wait
);
630 if (bio
->bi_iter
.bi_size
== 0) {
631 /* an empty barrier - all done */
634 bio
->bi_opf
&= ~REQ_PREFLUSH
;
635 md_handle_request(mddev
, bio
);
640 * Manages consolidation of flushes and submitting any flushes needed for
641 * a bio with REQ_PREFLUSH. Returns true if the bio is finished or is
642 * being finished in another context. Returns false if the flushing is
643 * complete but still needs the I/O portion of the bio to be processed.
645 bool md_flush_request(struct mddev
*mddev
, struct bio
*bio
)
647 ktime_t req_start
= ktime_get_boottime();
648 spin_lock_irq(&mddev
->lock
);
649 /* flush requests wait until ongoing flush completes,
650 * hence coalescing all the pending requests.
652 wait_event_lock_irq(mddev
->sb_wait
,
654 ktime_before(req_start
, mddev
->prev_flush_start
),
656 /* new request after previous flush is completed */
657 if (ktime_after(req_start
, mddev
->prev_flush_start
)) {
658 WARN_ON(mddev
->flush_bio
);
659 mddev
->flush_bio
= bio
;
662 spin_unlock_irq(&mddev
->lock
);
665 INIT_WORK(&mddev
->flush_work
, submit_flushes
);
666 queue_work(md_wq
, &mddev
->flush_work
);
668 /* flush was performed for some other bio while we waited. */
669 if (bio
->bi_iter
.bi_size
== 0)
670 /* an empty barrier - all done */
673 bio
->bi_opf
&= ~REQ_PREFLUSH
;
679 EXPORT_SYMBOL(md_flush_request
);
681 static inline struct mddev
*mddev_get(struct mddev
*mddev
)
683 atomic_inc(&mddev
->active
);
687 static void mddev_delayed_delete(struct work_struct
*ws
);
689 static void mddev_put(struct mddev
*mddev
)
691 if (!atomic_dec_and_lock(&mddev
->active
, &all_mddevs_lock
))
693 if (!mddev
->raid_disks
&& list_empty(&mddev
->disks
) &&
694 mddev
->ctime
== 0 && !mddev
->hold_active
) {
695 /* Array is not configured at all, and not held active,
697 list_del_init(&mddev
->all_mddevs
);
700 * Call queue_work inside the spinlock so that
701 * flush_workqueue() after mddev_find will succeed in waiting
702 * for the work to be done.
704 INIT_WORK(&mddev
->del_work
, mddev_delayed_delete
);
705 queue_work(md_misc_wq
, &mddev
->del_work
);
707 spin_unlock(&all_mddevs_lock
);
710 static void md_safemode_timeout(struct timer_list
*t
);
712 void mddev_init(struct mddev
*mddev
)
714 kobject_init(&mddev
->kobj
, &md_ktype
);
715 mutex_init(&mddev
->open_mutex
);
716 mutex_init(&mddev
->reconfig_mutex
);
717 mutex_init(&mddev
->bitmap_info
.mutex
);
718 INIT_LIST_HEAD(&mddev
->disks
);
719 INIT_LIST_HEAD(&mddev
->all_mddevs
);
720 timer_setup(&mddev
->safemode_timer
, md_safemode_timeout
, 0);
721 atomic_set(&mddev
->active
, 1);
722 atomic_set(&mddev
->openers
, 0);
723 atomic_set(&mddev
->active_io
, 0);
724 spin_lock_init(&mddev
->lock
);
725 atomic_set(&mddev
->flush_pending
, 0);
726 init_waitqueue_head(&mddev
->sb_wait
);
727 init_waitqueue_head(&mddev
->recovery_wait
);
728 mddev
->reshape_position
= MaxSector
;
729 mddev
->reshape_backwards
= 0;
730 mddev
->last_sync_action
= "none";
731 mddev
->resync_min
= 0;
732 mddev
->resync_max
= MaxSector
;
733 mddev
->level
= LEVEL_NONE
;
735 EXPORT_SYMBOL_GPL(mddev_init
);
737 static struct mddev
*mddev_find_locked(dev_t unit
)
741 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
742 if (mddev
->unit
== unit
)
748 /* find an unused unit number */
749 static dev_t
mddev_alloc_unit(void)
751 static int next_minor
= 512;
752 int start
= next_minor
;
757 dev
= MKDEV(MD_MAJOR
, next_minor
);
759 if (next_minor
> MINORMASK
)
761 if (next_minor
== start
)
762 return 0; /* Oh dear, all in use. */
763 is_free
= !mddev_find_locked(dev
);
769 static struct mddev
*mddev_find(dev_t unit
)
773 if (MAJOR(unit
) != MD_MAJOR
)
774 unit
&= ~((1 << MdpMinorShift
) - 1);
776 spin_lock(&all_mddevs_lock
);
777 mddev
= mddev_find_locked(unit
);
780 spin_unlock(&all_mddevs_lock
);
785 static struct mddev
*mddev_alloc(dev_t unit
)
790 if (unit
&& MAJOR(unit
) != MD_MAJOR
)
791 unit
&= ~((1 << MdpMinorShift
) - 1);
793 new = kzalloc(sizeof(*new), GFP_KERNEL
);
795 return ERR_PTR(-ENOMEM
);
798 spin_lock(&all_mddevs_lock
);
801 if (mddev_find_locked(unit
))
804 if (MAJOR(unit
) == MD_MAJOR
)
805 new->md_minor
= MINOR(unit
);
807 new->md_minor
= MINOR(unit
) >> MdpMinorShift
;
808 new->hold_active
= UNTIL_IOCTL
;
811 new->unit
= mddev_alloc_unit();
814 new->md_minor
= MINOR(new->unit
);
815 new->hold_active
= UNTIL_STOP
;
818 list_add(&new->all_mddevs
, &all_mddevs
);
819 spin_unlock(&all_mddevs_lock
);
822 spin_unlock(&all_mddevs_lock
);
824 return ERR_PTR(error
);
827 static struct attribute_group md_redundancy_group
;
829 void mddev_unlock(struct mddev
*mddev
)
831 if (mddev
->to_remove
) {
832 /* These cannot be removed under reconfig_mutex as
833 * an access to the files will try to take reconfig_mutex
834 * while holding the file unremovable, which leads to
836 * So hold set sysfs_active while the remove in happeing,
837 * and anything else which might set ->to_remove or my
838 * otherwise change the sysfs namespace will fail with
839 * -EBUSY if sysfs_active is still set.
840 * We set sysfs_active under reconfig_mutex and elsewhere
841 * test it under the same mutex to ensure its correct value
844 struct attribute_group
*to_remove
= mddev
->to_remove
;
845 mddev
->to_remove
= NULL
;
846 mddev
->sysfs_active
= 1;
847 mutex_unlock(&mddev
->reconfig_mutex
);
849 if (mddev
->kobj
.sd
) {
850 if (to_remove
!= &md_redundancy_group
)
851 sysfs_remove_group(&mddev
->kobj
, to_remove
);
852 if (mddev
->pers
== NULL
||
853 mddev
->pers
->sync_request
== NULL
) {
854 sysfs_remove_group(&mddev
->kobj
, &md_redundancy_group
);
855 if (mddev
->sysfs_action
)
856 sysfs_put(mddev
->sysfs_action
);
857 if (mddev
->sysfs_completed
)
858 sysfs_put(mddev
->sysfs_completed
);
859 if (mddev
->sysfs_degraded
)
860 sysfs_put(mddev
->sysfs_degraded
);
861 mddev
->sysfs_action
= NULL
;
862 mddev
->sysfs_completed
= NULL
;
863 mddev
->sysfs_degraded
= NULL
;
866 mddev
->sysfs_active
= 0;
868 mutex_unlock(&mddev
->reconfig_mutex
);
870 /* As we've dropped the mutex we need a spinlock to
871 * make sure the thread doesn't disappear
873 spin_lock(&pers_lock
);
874 md_wakeup_thread(mddev
->thread
);
875 wake_up(&mddev
->sb_wait
);
876 spin_unlock(&pers_lock
);
878 EXPORT_SYMBOL_GPL(mddev_unlock
);
880 struct md_rdev
*md_find_rdev_nr_rcu(struct mddev
*mddev
, int nr
)
882 struct md_rdev
*rdev
;
884 rdev_for_each_rcu(rdev
, mddev
)
885 if (rdev
->desc_nr
== nr
)
890 EXPORT_SYMBOL_GPL(md_find_rdev_nr_rcu
);
892 static struct md_rdev
*find_rdev(struct mddev
*mddev
, dev_t dev
)
894 struct md_rdev
*rdev
;
896 rdev_for_each(rdev
, mddev
)
897 if (rdev
->bdev
->bd_dev
== dev
)
903 struct md_rdev
*md_find_rdev_rcu(struct mddev
*mddev
, dev_t dev
)
905 struct md_rdev
*rdev
;
907 rdev_for_each_rcu(rdev
, mddev
)
908 if (rdev
->bdev
->bd_dev
== dev
)
913 EXPORT_SYMBOL_GPL(md_find_rdev_rcu
);
915 static struct md_personality
*find_pers(int level
, char *clevel
)
917 struct md_personality
*pers
;
918 list_for_each_entry(pers
, &pers_list
, list
) {
919 if (level
!= LEVEL_NONE
&& pers
->level
== level
)
921 if (strcmp(pers
->name
, clevel
)==0)
927 /* return the offset of the super block in 512byte sectors */
928 static inline sector_t
calc_dev_sboffset(struct md_rdev
*rdev
)
930 sector_t num_sectors
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
931 return MD_NEW_SIZE_SECTORS(num_sectors
);
934 static int alloc_disk_sb(struct md_rdev
*rdev
)
936 rdev
->sb_page
= alloc_page(GFP_KERNEL
);
942 void md_rdev_clear(struct md_rdev
*rdev
)
945 put_page(rdev
->sb_page
);
947 rdev
->sb_page
= NULL
;
952 put_page(rdev
->bb_page
);
953 rdev
->bb_page
= NULL
;
955 badblocks_exit(&rdev
->badblocks
);
957 EXPORT_SYMBOL_GPL(md_rdev_clear
);
959 static void super_written(struct bio
*bio
)
961 struct md_rdev
*rdev
= bio
->bi_private
;
962 struct mddev
*mddev
= rdev
->mddev
;
964 if (bio
->bi_status
) {
965 pr_err("md: %s gets error=%d\n", __func__
,
966 blk_status_to_errno(bio
->bi_status
));
967 md_error(mddev
, rdev
);
968 if (!test_bit(Faulty
, &rdev
->flags
)
969 && (bio
->bi_opf
& MD_FAILFAST
)) {
970 set_bit(MD_SB_NEED_REWRITE
, &mddev
->sb_flags
);
971 set_bit(LastDev
, &rdev
->flags
);
974 clear_bit(LastDev
, &rdev
->flags
);
976 if (atomic_dec_and_test(&mddev
->pending_writes
))
977 wake_up(&mddev
->sb_wait
);
978 rdev_dec_pending(rdev
, mddev
);
982 void md_super_write(struct mddev
*mddev
, struct md_rdev
*rdev
,
983 sector_t sector
, int size
, struct page
*page
)
985 /* write first size bytes of page to sector of rdev
986 * Increment mddev->pending_writes before returning
987 * and decrement it on completion, waking up sb_wait
988 * if zero is reached.
989 * If an error occurred, call md_error
997 if (test_bit(Faulty
, &rdev
->flags
))
1000 bio
= bio_alloc_bioset(GFP_NOIO
, 1, &mddev
->sync_set
);
1002 atomic_inc(&rdev
->nr_pending
);
1004 bio_set_dev(bio
, rdev
->meta_bdev
? rdev
->meta_bdev
: rdev
->bdev
);
1005 bio
->bi_iter
.bi_sector
= sector
;
1006 bio_add_page(bio
, page
, size
, 0);
1007 bio
->bi_private
= rdev
;
1008 bio
->bi_end_io
= super_written
;
1010 if (test_bit(MD_FAILFAST_SUPPORTED
, &mddev
->flags
) &&
1011 test_bit(FailFast
, &rdev
->flags
) &&
1012 !test_bit(LastDev
, &rdev
->flags
))
1014 bio
->bi_opf
= REQ_OP_WRITE
| REQ_SYNC
| REQ_PREFLUSH
| REQ_FUA
| ff
;
1016 atomic_inc(&mddev
->pending_writes
);
1020 int md_super_wait(struct mddev
*mddev
)
1022 /* wait for all superblock writes that were scheduled to complete */
1023 wait_event(mddev
->sb_wait
, atomic_read(&mddev
->pending_writes
)==0);
1024 if (test_and_clear_bit(MD_SB_NEED_REWRITE
, &mddev
->sb_flags
))
1029 int sync_page_io(struct md_rdev
*rdev
, sector_t sector
, int size
,
1030 struct page
*page
, int op
, int op_flags
, bool metadata_op
)
1033 struct bio_vec bvec
;
1035 bio_init(&bio
, &bvec
, 1);
1037 if (metadata_op
&& rdev
->meta_bdev
)
1038 bio_set_dev(&bio
, rdev
->meta_bdev
);
1040 bio_set_dev(&bio
, rdev
->bdev
);
1041 bio
.bi_opf
= op
| op_flags
;
1043 bio
.bi_iter
.bi_sector
= sector
+ rdev
->sb_start
;
1044 else if (rdev
->mddev
->reshape_position
!= MaxSector
&&
1045 (rdev
->mddev
->reshape_backwards
==
1046 (sector
>= rdev
->mddev
->reshape_position
)))
1047 bio
.bi_iter
.bi_sector
= sector
+ rdev
->new_data_offset
;
1049 bio
.bi_iter
.bi_sector
= sector
+ rdev
->data_offset
;
1050 bio_add_page(&bio
, page
, size
, 0);
1052 submit_bio_wait(&bio
);
1054 return !bio
.bi_status
;
1056 EXPORT_SYMBOL_GPL(sync_page_io
);
1058 static int read_disk_sb(struct md_rdev
*rdev
, int size
)
1060 char b
[BDEVNAME_SIZE
];
1062 if (rdev
->sb_loaded
)
1065 if (!sync_page_io(rdev
, 0, size
, rdev
->sb_page
, REQ_OP_READ
, 0, true))
1067 rdev
->sb_loaded
= 1;
1071 pr_err("md: disabled device %s, could not read superblock.\n",
1072 bdevname(rdev
->bdev
,b
));
1076 static int md_uuid_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
1078 return sb1
->set_uuid0
== sb2
->set_uuid0
&&
1079 sb1
->set_uuid1
== sb2
->set_uuid1
&&
1080 sb1
->set_uuid2
== sb2
->set_uuid2
&&
1081 sb1
->set_uuid3
== sb2
->set_uuid3
;
1084 static int md_sb_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
1087 mdp_super_t
*tmp1
, *tmp2
;
1089 tmp1
= kmalloc(sizeof(*tmp1
),GFP_KERNEL
);
1090 tmp2
= kmalloc(sizeof(*tmp2
),GFP_KERNEL
);
1092 if (!tmp1
|| !tmp2
) {
1101 * nr_disks is not constant
1106 ret
= (memcmp(tmp1
, tmp2
, MD_SB_GENERIC_CONSTANT_WORDS
* 4) == 0);
1113 static u32
md_csum_fold(u32 csum
)
1115 csum
= (csum
& 0xffff) + (csum
>> 16);
1116 return (csum
& 0xffff) + (csum
>> 16);
1119 static unsigned int calc_sb_csum(mdp_super_t
*sb
)
1122 u32
*sb32
= (u32
*)sb
;
1124 unsigned int disk_csum
, csum
;
1126 disk_csum
= sb
->sb_csum
;
1129 for (i
= 0; i
< MD_SB_BYTES
/4 ; i
++)
1131 csum
= (newcsum
& 0xffffffff) + (newcsum
>>32);
1134 /* This used to use csum_partial, which was wrong for several
1135 * reasons including that different results are returned on
1136 * different architectures. It isn't critical that we get exactly
1137 * the same return value as before (we always csum_fold before
1138 * testing, and that removes any differences). However as we
1139 * know that csum_partial always returned a 16bit value on
1140 * alphas, do a fold to maximise conformity to previous behaviour.
1142 sb
->sb_csum
= md_csum_fold(disk_csum
);
1144 sb
->sb_csum
= disk_csum
;
1150 * Handle superblock details.
1151 * We want to be able to handle multiple superblock formats
1152 * so we have a common interface to them all, and an array of
1153 * different handlers.
1154 * We rely on user-space to write the initial superblock, and support
1155 * reading and updating of superblocks.
1156 * Interface methods are:
1157 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version)
1158 * loads and validates a superblock on dev.
1159 * if refdev != NULL, compare superblocks on both devices
1161 * 0 - dev has a superblock that is compatible with refdev
1162 * 1 - dev has a superblock that is compatible and newer than refdev
1163 * so dev should be used as the refdev in future
1164 * -EINVAL superblock incompatible or invalid
1165 * -othererror e.g. -EIO
1167 * int validate_super(struct mddev *mddev, struct md_rdev *dev)
1168 * Verify that dev is acceptable into mddev.
1169 * The first time, mddev->raid_disks will be 0, and data from
1170 * dev should be merged in. Subsequent calls check that dev
1171 * is new enough. Return 0 or -EINVAL
1173 * void sync_super(struct mddev *mddev, struct md_rdev *dev)
1174 * Update the superblock for rdev with data in mddev
1175 * This does not write to disc.
1181 struct module
*owner
;
1182 int (*load_super
)(struct md_rdev
*rdev
,
1183 struct md_rdev
*refdev
,
1185 int (*validate_super
)(struct mddev
*mddev
,
1186 struct md_rdev
*rdev
);
1187 void (*sync_super
)(struct mddev
*mddev
,
1188 struct md_rdev
*rdev
);
1189 unsigned long long (*rdev_size_change
)(struct md_rdev
*rdev
,
1190 sector_t num_sectors
);
1191 int (*allow_new_offset
)(struct md_rdev
*rdev
,
1192 unsigned long long new_offset
);
1196 * Check that the given mddev has no bitmap.
1198 * This function is called from the run method of all personalities that do not
1199 * support bitmaps. It prints an error message and returns non-zero if mddev
1200 * has a bitmap. Otherwise, it returns 0.
1203 int md_check_no_bitmap(struct mddev
*mddev
)
1205 if (!mddev
->bitmap_info
.file
&& !mddev
->bitmap_info
.offset
)
1207 pr_warn("%s: bitmaps are not supported for %s\n",
1208 mdname(mddev
), mddev
->pers
->name
);
1211 EXPORT_SYMBOL(md_check_no_bitmap
);
1214 * load_super for 0.90.0
1216 static int super_90_load(struct md_rdev
*rdev
, struct md_rdev
*refdev
, int minor_version
)
1218 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1221 bool spare_disk
= true;
1224 * Calculate the position of the superblock (512byte sectors),
1225 * it's at the end of the disk.
1227 * It also happens to be a multiple of 4Kb.
1229 rdev
->sb_start
= calc_dev_sboffset(rdev
);
1231 ret
= read_disk_sb(rdev
, MD_SB_BYTES
);
1237 bdevname(rdev
->bdev
, b
);
1238 sb
= page_address(rdev
->sb_page
);
1240 if (sb
->md_magic
!= MD_SB_MAGIC
) {
1241 pr_warn("md: invalid raid superblock magic on %s\n", b
);
1245 if (sb
->major_version
!= 0 ||
1246 sb
->minor_version
< 90 ||
1247 sb
->minor_version
> 91) {
1248 pr_warn("Bad version number %d.%d on %s\n",
1249 sb
->major_version
, sb
->minor_version
, b
);
1253 if (sb
->raid_disks
<= 0)
1256 if (md_csum_fold(calc_sb_csum(sb
)) != md_csum_fold(sb
->sb_csum
)) {
1257 pr_warn("md: invalid superblock checksum on %s\n", b
);
1261 rdev
->preferred_minor
= sb
->md_minor
;
1262 rdev
->data_offset
= 0;
1263 rdev
->new_data_offset
= 0;
1264 rdev
->sb_size
= MD_SB_BYTES
;
1265 rdev
->badblocks
.shift
= -1;
1267 if (sb
->level
== LEVEL_MULTIPATH
)
1270 rdev
->desc_nr
= sb
->this_disk
.number
;
1272 /* not spare disk, or LEVEL_MULTIPATH */
1273 if (sb
->level
== LEVEL_MULTIPATH
||
1274 (rdev
->desc_nr
>= 0 &&
1275 rdev
->desc_nr
< MD_SB_DISKS
&&
1276 sb
->disks
[rdev
->desc_nr
].state
&
1277 ((1<<MD_DISK_SYNC
) | (1 << MD_DISK_ACTIVE
))))
1287 mdp_super_t
*refsb
= page_address(refdev
->sb_page
);
1288 if (!md_uuid_equal(refsb
, sb
)) {
1289 pr_warn("md: %s has different UUID to %s\n",
1290 b
, bdevname(refdev
->bdev
,b2
));
1293 if (!md_sb_equal(refsb
, sb
)) {
1294 pr_warn("md: %s has same UUID but different superblock to %s\n",
1295 b
, bdevname(refdev
->bdev
, b2
));
1299 ev2
= md_event(refsb
);
1301 if (!spare_disk
&& ev1
> ev2
)
1306 rdev
->sectors
= rdev
->sb_start
;
1307 /* Limit to 4TB as metadata cannot record more than that.
1308 * (not needed for Linear and RAID0 as metadata doesn't
1311 if ((u64
)rdev
->sectors
>= (2ULL << 32) && sb
->level
>= 1)
1312 rdev
->sectors
= (sector_t
)(2ULL << 32) - 2;
1314 if (rdev
->sectors
< ((sector_t
)sb
->size
) * 2 && sb
->level
>= 1)
1315 /* "this cannot possibly happen" ... */
1323 * validate_super for 0.90.0
1325 static int super_90_validate(struct mddev
*mddev
, struct md_rdev
*rdev
)
1328 mdp_super_t
*sb
= page_address(rdev
->sb_page
);
1329 __u64 ev1
= md_event(sb
);
1331 rdev
->raid_disk
= -1;
1332 clear_bit(Faulty
, &rdev
->flags
);
1333 clear_bit(In_sync
, &rdev
->flags
);
1334 clear_bit(Bitmap_sync
, &rdev
->flags
);
1335 clear_bit(WriteMostly
, &rdev
->flags
);
1337 if (mddev
->raid_disks
== 0) {
1338 mddev
->major_version
= 0;
1339 mddev
->minor_version
= sb
->minor_version
;
1340 mddev
->patch_version
= sb
->patch_version
;
1341 mddev
->external
= 0;
1342 mddev
->chunk_sectors
= sb
->chunk_size
>> 9;
1343 mddev
->ctime
= sb
->ctime
;
1344 mddev
->utime
= sb
->utime
;
1345 mddev
->level
= sb
->level
;
1346 mddev
->clevel
[0] = 0;
1347 mddev
->layout
= sb
->layout
;
1348 mddev
->raid_disks
= sb
->raid_disks
;
1349 mddev
->dev_sectors
= ((sector_t
)sb
->size
) * 2;
1350 mddev
->events
= ev1
;
1351 mddev
->bitmap_info
.offset
= 0;
1352 mddev
->bitmap_info
.space
= 0;
1353 /* bitmap can use 60 K after the 4K superblocks */
1354 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
1355 mddev
->bitmap_info
.default_space
= 64*2 - (MD_SB_BYTES
>> 9);
1356 mddev
->reshape_backwards
= 0;
1358 if (mddev
->minor_version
>= 91) {
1359 mddev
->reshape_position
= sb
->reshape_position
;
1360 mddev
->delta_disks
= sb
->delta_disks
;
1361 mddev
->new_level
= sb
->new_level
;
1362 mddev
->new_layout
= sb
->new_layout
;
1363 mddev
->new_chunk_sectors
= sb
->new_chunk
>> 9;
1364 if (mddev
->delta_disks
< 0)
1365 mddev
->reshape_backwards
= 1;
1367 mddev
->reshape_position
= MaxSector
;
1368 mddev
->delta_disks
= 0;
1369 mddev
->new_level
= mddev
->level
;
1370 mddev
->new_layout
= mddev
->layout
;
1371 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1373 if (mddev
->level
== 0)
1376 if (sb
->state
& (1<<MD_SB_CLEAN
))
1377 mddev
->recovery_cp
= MaxSector
;
1379 if (sb
->events_hi
== sb
->cp_events_hi
&&
1380 sb
->events_lo
== sb
->cp_events_lo
) {
1381 mddev
->recovery_cp
= sb
->recovery_cp
;
1383 mddev
->recovery_cp
= 0;
1386 memcpy(mddev
->uuid
+0, &sb
->set_uuid0
, 4);
1387 memcpy(mddev
->uuid
+4, &sb
->set_uuid1
, 4);
1388 memcpy(mddev
->uuid
+8, &sb
->set_uuid2
, 4);
1389 memcpy(mddev
->uuid
+12,&sb
->set_uuid3
, 4);
1391 mddev
->max_disks
= MD_SB_DISKS
;
1393 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
) &&
1394 mddev
->bitmap_info
.file
== NULL
) {
1395 mddev
->bitmap_info
.offset
=
1396 mddev
->bitmap_info
.default_offset
;
1397 mddev
->bitmap_info
.space
=
1398 mddev
->bitmap_info
.default_space
;
1401 } else if (mddev
->pers
== NULL
) {
1402 /* Insist on good event counter while assembling, except
1403 * for spares (which don't need an event count) */
1405 if (sb
->disks
[rdev
->desc_nr
].state
& (
1406 (1<<MD_DISK_SYNC
) | (1 << MD_DISK_ACTIVE
)))
1407 if (ev1
< mddev
->events
)
1409 } else if (mddev
->bitmap
) {
1410 /* if adding to array with a bitmap, then we can accept an
1411 * older device ... but not too old.
1413 if (ev1
< mddev
->bitmap
->events_cleared
)
1415 if (ev1
< mddev
->events
)
1416 set_bit(Bitmap_sync
, &rdev
->flags
);
1418 if (ev1
< mddev
->events
)
1419 /* just a hot-add of a new device, leave raid_disk at -1 */
1423 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1424 desc
= sb
->disks
+ rdev
->desc_nr
;
1426 if (desc
->state
& (1<<MD_DISK_FAULTY
))
1427 set_bit(Faulty
, &rdev
->flags
);
1428 else if (desc
->state
& (1<<MD_DISK_SYNC
) /* &&
1429 desc->raid_disk < mddev->raid_disks */) {
1430 set_bit(In_sync
, &rdev
->flags
);
1431 rdev
->raid_disk
= desc
->raid_disk
;
1432 rdev
->saved_raid_disk
= desc
->raid_disk
;
1433 } else if (desc
->state
& (1<<MD_DISK_ACTIVE
)) {
1434 /* active but not in sync implies recovery up to
1435 * reshape position. We don't know exactly where
1436 * that is, so set to zero for now */
1437 if (mddev
->minor_version
>= 91) {
1438 rdev
->recovery_offset
= 0;
1439 rdev
->raid_disk
= desc
->raid_disk
;
1442 if (desc
->state
& (1<<MD_DISK_WRITEMOSTLY
))
1443 set_bit(WriteMostly
, &rdev
->flags
);
1444 if (desc
->state
& (1<<MD_DISK_FAILFAST
))
1445 set_bit(FailFast
, &rdev
->flags
);
1446 } else /* MULTIPATH are always insync */
1447 set_bit(In_sync
, &rdev
->flags
);
1452 * sync_super for 0.90.0
1454 static void super_90_sync(struct mddev
*mddev
, struct md_rdev
*rdev
)
1457 struct md_rdev
*rdev2
;
1458 int next_spare
= mddev
->raid_disks
;
1460 /* make rdev->sb match mddev data..
1463 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1464 * 3/ any empty disks < next_spare become removed
1466 * disks[0] gets initialised to REMOVED because
1467 * we cannot be sure from other fields if it has
1468 * been initialised or not.
1471 int active
=0, working
=0,failed
=0,spare
=0,nr_disks
=0;
1473 rdev
->sb_size
= MD_SB_BYTES
;
1475 sb
= page_address(rdev
->sb_page
);
1477 memset(sb
, 0, sizeof(*sb
));
1479 sb
->md_magic
= MD_SB_MAGIC
;
1480 sb
->major_version
= mddev
->major_version
;
1481 sb
->patch_version
= mddev
->patch_version
;
1482 sb
->gvalid_words
= 0; /* ignored */
1483 memcpy(&sb
->set_uuid0
, mddev
->uuid
+0, 4);
1484 memcpy(&sb
->set_uuid1
, mddev
->uuid
+4, 4);
1485 memcpy(&sb
->set_uuid2
, mddev
->uuid
+8, 4);
1486 memcpy(&sb
->set_uuid3
, mddev
->uuid
+12,4);
1488 sb
->ctime
= clamp_t(time64_t
, mddev
->ctime
, 0, U32_MAX
);
1489 sb
->level
= mddev
->level
;
1490 sb
->size
= mddev
->dev_sectors
/ 2;
1491 sb
->raid_disks
= mddev
->raid_disks
;
1492 sb
->md_minor
= mddev
->md_minor
;
1493 sb
->not_persistent
= 0;
1494 sb
->utime
= clamp_t(time64_t
, mddev
->utime
, 0, U32_MAX
);
1496 sb
->events_hi
= (mddev
->events
>>32);
1497 sb
->events_lo
= (u32
)mddev
->events
;
1499 if (mddev
->reshape_position
== MaxSector
)
1500 sb
->minor_version
= 90;
1502 sb
->minor_version
= 91;
1503 sb
->reshape_position
= mddev
->reshape_position
;
1504 sb
->new_level
= mddev
->new_level
;
1505 sb
->delta_disks
= mddev
->delta_disks
;
1506 sb
->new_layout
= mddev
->new_layout
;
1507 sb
->new_chunk
= mddev
->new_chunk_sectors
<< 9;
1509 mddev
->minor_version
= sb
->minor_version
;
1512 sb
->recovery_cp
= mddev
->recovery_cp
;
1513 sb
->cp_events_hi
= (mddev
->events
>>32);
1514 sb
->cp_events_lo
= (u32
)mddev
->events
;
1515 if (mddev
->recovery_cp
== MaxSector
)
1516 sb
->state
= (1<< MD_SB_CLEAN
);
1518 sb
->recovery_cp
= 0;
1520 sb
->layout
= mddev
->layout
;
1521 sb
->chunk_size
= mddev
->chunk_sectors
<< 9;
1523 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
)
1524 sb
->state
|= (1<<MD_SB_BITMAP_PRESENT
);
1526 sb
->disks
[0].state
= (1<<MD_DISK_REMOVED
);
1527 rdev_for_each(rdev2
, mddev
) {
1530 int is_active
= test_bit(In_sync
, &rdev2
->flags
);
1532 if (rdev2
->raid_disk
>= 0 &&
1533 sb
->minor_version
>= 91)
1534 /* we have nowhere to store the recovery_offset,
1535 * but if it is not below the reshape_position,
1536 * we can piggy-back on that.
1539 if (rdev2
->raid_disk
< 0 ||
1540 test_bit(Faulty
, &rdev2
->flags
))
1543 desc_nr
= rdev2
->raid_disk
;
1545 desc_nr
= next_spare
++;
1546 rdev2
->desc_nr
= desc_nr
;
1547 d
= &sb
->disks
[rdev2
->desc_nr
];
1549 d
->number
= rdev2
->desc_nr
;
1550 d
->major
= MAJOR(rdev2
->bdev
->bd_dev
);
1551 d
->minor
= MINOR(rdev2
->bdev
->bd_dev
);
1553 d
->raid_disk
= rdev2
->raid_disk
;
1555 d
->raid_disk
= rdev2
->desc_nr
; /* compatibility */
1556 if (test_bit(Faulty
, &rdev2
->flags
))
1557 d
->state
= (1<<MD_DISK_FAULTY
);
1558 else if (is_active
) {
1559 d
->state
= (1<<MD_DISK_ACTIVE
);
1560 if (test_bit(In_sync
, &rdev2
->flags
))
1561 d
->state
|= (1<<MD_DISK_SYNC
);
1569 if (test_bit(WriteMostly
, &rdev2
->flags
))
1570 d
->state
|= (1<<MD_DISK_WRITEMOSTLY
);
1571 if (test_bit(FailFast
, &rdev2
->flags
))
1572 d
->state
|= (1<<MD_DISK_FAILFAST
);
1574 /* now set the "removed" and "faulty" bits on any missing devices */
1575 for (i
=0 ; i
< mddev
->raid_disks
; i
++) {
1576 mdp_disk_t
*d
= &sb
->disks
[i
];
1577 if (d
->state
== 0 && d
->number
== 0) {
1580 d
->state
= (1<<MD_DISK_REMOVED
);
1581 d
->state
|= (1<<MD_DISK_FAULTY
);
1585 sb
->nr_disks
= nr_disks
;
1586 sb
->active_disks
= active
;
1587 sb
->working_disks
= working
;
1588 sb
->failed_disks
= failed
;
1589 sb
->spare_disks
= spare
;
1591 sb
->this_disk
= sb
->disks
[rdev
->desc_nr
];
1592 sb
->sb_csum
= calc_sb_csum(sb
);
1596 * rdev_size_change for 0.90.0
1598 static unsigned long long
1599 super_90_rdev_size_change(struct md_rdev
*rdev
, sector_t num_sectors
)
1601 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1602 return 0; /* component must fit device */
1603 if (rdev
->mddev
->bitmap_info
.offset
)
1604 return 0; /* can't move bitmap */
1605 rdev
->sb_start
= calc_dev_sboffset(rdev
);
1606 if (!num_sectors
|| num_sectors
> rdev
->sb_start
)
1607 num_sectors
= rdev
->sb_start
;
1608 /* Limit to 4TB as metadata cannot record more than that.
1609 * 4TB == 2^32 KB, or 2*2^32 sectors.
1611 if ((u64
)num_sectors
>= (2ULL << 32) && rdev
->mddev
->level
>= 1)
1612 num_sectors
= (sector_t
)(2ULL << 32) - 2;
1614 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1616 } while (md_super_wait(rdev
->mddev
) < 0);
1621 super_90_allow_new_offset(struct md_rdev
*rdev
, unsigned long long new_offset
)
1623 /* non-zero offset changes not possible with v0.90 */
1624 return new_offset
== 0;
1628 * version 1 superblock
1631 static __le32
calc_sb_1_csum(struct mdp_superblock_1
*sb
)
1635 unsigned long long newcsum
;
1636 int size
= 256 + le32_to_cpu(sb
->max_dev
)*2;
1637 __le32
*isuper
= (__le32
*)sb
;
1639 disk_csum
= sb
->sb_csum
;
1642 for (; size
>= 4; size
-= 4)
1643 newcsum
+= le32_to_cpu(*isuper
++);
1646 newcsum
+= le16_to_cpu(*(__le16
*) isuper
);
1648 csum
= (newcsum
& 0xffffffff) + (newcsum
>> 32);
1649 sb
->sb_csum
= disk_csum
;
1650 return cpu_to_le32(csum
);
1653 static int super_1_load(struct md_rdev
*rdev
, struct md_rdev
*refdev
, int minor_version
)
1655 struct mdp_superblock_1
*sb
;
1659 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1661 bool spare_disk
= true;
1664 * Calculate the position of the superblock in 512byte sectors.
1665 * It is always aligned to a 4K boundary and
1666 * depeding on minor_version, it can be:
1667 * 0: At least 8K, but less than 12K, from end of device
1668 * 1: At start of device
1669 * 2: 4K from start of device.
1671 switch(minor_version
) {
1673 sb_start
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1675 sb_start
&= ~(sector_t
)(4*2-1);
1686 rdev
->sb_start
= sb_start
;
1688 /* superblock is rarely larger than 1K, but it can be larger,
1689 * and it is safe to read 4k, so we do that
1691 ret
= read_disk_sb(rdev
, 4096);
1692 if (ret
) return ret
;
1694 sb
= page_address(rdev
->sb_page
);
1696 if (sb
->magic
!= cpu_to_le32(MD_SB_MAGIC
) ||
1697 sb
->major_version
!= cpu_to_le32(1) ||
1698 le32_to_cpu(sb
->max_dev
) > (4096-256)/2 ||
1699 le64_to_cpu(sb
->super_offset
) != rdev
->sb_start
||
1700 (le32_to_cpu(sb
->feature_map
) & ~MD_FEATURE_ALL
) != 0)
1703 if (calc_sb_1_csum(sb
) != sb
->sb_csum
) {
1704 pr_warn("md: invalid superblock checksum on %s\n",
1705 bdevname(rdev
->bdev
,b
));
1708 if (le64_to_cpu(sb
->data_size
) < 10) {
1709 pr_warn("md: data_size too small on %s\n",
1710 bdevname(rdev
->bdev
,b
));
1715 memcmp(sb
->pad3
, sb
->pad3
+1, sizeof(sb
->pad3
) - sizeof(sb
->pad3
[1])))
1716 /* Some padding is non-zero, might be a new feature */
1719 rdev
->preferred_minor
= 0xffff;
1720 rdev
->data_offset
= le64_to_cpu(sb
->data_offset
);
1721 rdev
->new_data_offset
= rdev
->data_offset
;
1722 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
) &&
1723 (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_NEW_OFFSET
))
1724 rdev
->new_data_offset
+= (s32
)le32_to_cpu(sb
->new_offset
);
1725 atomic_set(&rdev
->corrected_errors
, le32_to_cpu(sb
->cnt_corrected_read
));
1727 rdev
->sb_size
= le32_to_cpu(sb
->max_dev
) * 2 + 256;
1728 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1729 if (rdev
->sb_size
& bmask
)
1730 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1733 && rdev
->data_offset
< sb_start
+ (rdev
->sb_size
/512))
1736 && rdev
->new_data_offset
< sb_start
+ (rdev
->sb_size
/512))
1739 if (sb
->level
== cpu_to_le32(LEVEL_MULTIPATH
))
1742 rdev
->desc_nr
= le32_to_cpu(sb
->dev_number
);
1744 if (!rdev
->bb_page
) {
1745 rdev
->bb_page
= alloc_page(GFP_KERNEL
);
1749 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BAD_BLOCKS
) &&
1750 rdev
->badblocks
.count
== 0) {
1751 /* need to load the bad block list.
1752 * Currently we limit it to one page.
1758 int sectors
= le16_to_cpu(sb
->bblog_size
);
1759 if (sectors
> (PAGE_SIZE
/ 512))
1761 offset
= le32_to_cpu(sb
->bblog_offset
);
1764 bb_sector
= (long long)offset
;
1765 if (!sync_page_io(rdev
, bb_sector
, sectors
<< 9,
1766 rdev
->bb_page
, REQ_OP_READ
, 0, true))
1768 bbp
= (__le64
*)page_address(rdev
->bb_page
);
1769 rdev
->badblocks
.shift
= sb
->bblog_shift
;
1770 for (i
= 0 ; i
< (sectors
<< (9-3)) ; i
++, bbp
++) {
1771 u64 bb
= le64_to_cpu(*bbp
);
1772 int count
= bb
& (0x3ff);
1773 u64 sector
= bb
>> 10;
1774 sector
<<= sb
->bblog_shift
;
1775 count
<<= sb
->bblog_shift
;
1778 if (badblocks_set(&rdev
->badblocks
, sector
, count
, 1))
1781 } else if (sb
->bblog_offset
!= 0)
1782 rdev
->badblocks
.shift
= 0;
1784 if ((le32_to_cpu(sb
->feature_map
) &
1785 (MD_FEATURE_PPL
| MD_FEATURE_MULTIPLE_PPLS
))) {
1786 rdev
->ppl
.offset
= (__s16
)le16_to_cpu(sb
->ppl
.offset
);
1787 rdev
->ppl
.size
= le16_to_cpu(sb
->ppl
.size
);
1788 rdev
->ppl
.sector
= rdev
->sb_start
+ rdev
->ppl
.offset
;
1791 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RAID0_LAYOUT
) &&
1795 /* not spare disk, or LEVEL_MULTIPATH */
1796 if (sb
->level
== cpu_to_le32(LEVEL_MULTIPATH
) ||
1797 (rdev
->desc_nr
>= 0 &&
1798 rdev
->desc_nr
< le32_to_cpu(sb
->max_dev
) &&
1799 (le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]) < MD_DISK_ROLE_MAX
||
1800 le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]) == MD_DISK_ROLE_JOURNAL
)))
1810 struct mdp_superblock_1
*refsb
= page_address(refdev
->sb_page
);
1812 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16) != 0 ||
1813 sb
->level
!= refsb
->level
||
1814 sb
->layout
!= refsb
->layout
||
1815 sb
->chunksize
!= refsb
->chunksize
) {
1816 pr_warn("md: %s has strangely different superblock to %s\n",
1817 bdevname(rdev
->bdev
,b
),
1818 bdevname(refdev
->bdev
,b2
));
1821 ev1
= le64_to_cpu(sb
->events
);
1822 ev2
= le64_to_cpu(refsb
->events
);
1824 if (!spare_disk
&& ev1
> ev2
)
1829 if (minor_version
) {
1830 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9);
1831 sectors
-= rdev
->data_offset
;
1833 sectors
= rdev
->sb_start
;
1834 if (sectors
< le64_to_cpu(sb
->data_size
))
1836 rdev
->sectors
= le64_to_cpu(sb
->data_size
);
1840 static int super_1_validate(struct mddev
*mddev
, struct md_rdev
*rdev
)
1842 struct mdp_superblock_1
*sb
= page_address(rdev
->sb_page
);
1843 __u64 ev1
= le64_to_cpu(sb
->events
);
1845 rdev
->raid_disk
= -1;
1846 clear_bit(Faulty
, &rdev
->flags
);
1847 clear_bit(In_sync
, &rdev
->flags
);
1848 clear_bit(Bitmap_sync
, &rdev
->flags
);
1849 clear_bit(WriteMostly
, &rdev
->flags
);
1851 if (mddev
->raid_disks
== 0) {
1852 mddev
->major_version
= 1;
1853 mddev
->patch_version
= 0;
1854 mddev
->external
= 0;
1855 mddev
->chunk_sectors
= le32_to_cpu(sb
->chunksize
);
1856 mddev
->ctime
= le64_to_cpu(sb
->ctime
);
1857 mddev
->utime
= le64_to_cpu(sb
->utime
);
1858 mddev
->level
= le32_to_cpu(sb
->level
);
1859 mddev
->clevel
[0] = 0;
1860 mddev
->layout
= le32_to_cpu(sb
->layout
);
1861 mddev
->raid_disks
= le32_to_cpu(sb
->raid_disks
);
1862 mddev
->dev_sectors
= le64_to_cpu(sb
->size
);
1863 mddev
->events
= ev1
;
1864 mddev
->bitmap_info
.offset
= 0;
1865 mddev
->bitmap_info
.space
= 0;
1866 /* Default location for bitmap is 1K after superblock
1867 * using 3K - total of 4K
1869 mddev
->bitmap_info
.default_offset
= 1024 >> 9;
1870 mddev
->bitmap_info
.default_space
= (4096-1024) >> 9;
1871 mddev
->reshape_backwards
= 0;
1873 mddev
->recovery_cp
= le64_to_cpu(sb
->resync_offset
);
1874 memcpy(mddev
->uuid
, sb
->set_uuid
, 16);
1876 mddev
->max_disks
= (4096-256)/2;
1878 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
) &&
1879 mddev
->bitmap_info
.file
== NULL
) {
1880 mddev
->bitmap_info
.offset
=
1881 (__s32
)le32_to_cpu(sb
->bitmap_offset
);
1882 /* Metadata doesn't record how much space is available.
1883 * For 1.0, we assume we can use up to the superblock
1884 * if before, else to 4K beyond superblock.
1885 * For others, assume no change is possible.
1887 if (mddev
->minor_version
> 0)
1888 mddev
->bitmap_info
.space
= 0;
1889 else if (mddev
->bitmap_info
.offset
> 0)
1890 mddev
->bitmap_info
.space
=
1891 8 - mddev
->bitmap_info
.offset
;
1893 mddev
->bitmap_info
.space
=
1894 -mddev
->bitmap_info
.offset
;
1897 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
1898 mddev
->reshape_position
= le64_to_cpu(sb
->reshape_position
);
1899 mddev
->delta_disks
= le32_to_cpu(sb
->delta_disks
);
1900 mddev
->new_level
= le32_to_cpu(sb
->new_level
);
1901 mddev
->new_layout
= le32_to_cpu(sb
->new_layout
);
1902 mddev
->new_chunk_sectors
= le32_to_cpu(sb
->new_chunk
);
1903 if (mddev
->delta_disks
< 0 ||
1904 (mddev
->delta_disks
== 0 &&
1905 (le32_to_cpu(sb
->feature_map
)
1906 & MD_FEATURE_RESHAPE_BACKWARDS
)))
1907 mddev
->reshape_backwards
= 1;
1909 mddev
->reshape_position
= MaxSector
;
1910 mddev
->delta_disks
= 0;
1911 mddev
->new_level
= mddev
->level
;
1912 mddev
->new_layout
= mddev
->layout
;
1913 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1916 if (mddev
->level
== 0 &&
1917 !(le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RAID0_LAYOUT
))
1920 if (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_JOURNAL
)
1921 set_bit(MD_HAS_JOURNAL
, &mddev
->flags
);
1923 if (le32_to_cpu(sb
->feature_map
) &
1924 (MD_FEATURE_PPL
| MD_FEATURE_MULTIPLE_PPLS
)) {
1925 if (le32_to_cpu(sb
->feature_map
) &
1926 (MD_FEATURE_BITMAP_OFFSET
| MD_FEATURE_JOURNAL
))
1928 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_PPL
) &&
1929 (le32_to_cpu(sb
->feature_map
) &
1930 MD_FEATURE_MULTIPLE_PPLS
))
1932 set_bit(MD_HAS_PPL
, &mddev
->flags
);
1934 } else if (mddev
->pers
== NULL
) {
1935 /* Insist of good event counter while assembling, except for
1936 * spares (which don't need an event count) */
1938 if (rdev
->desc_nr
>= 0 &&
1939 rdev
->desc_nr
< le32_to_cpu(sb
->max_dev
) &&
1940 (le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]) < MD_DISK_ROLE_MAX
||
1941 le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]) == MD_DISK_ROLE_JOURNAL
))
1942 if (ev1
< mddev
->events
)
1944 } else if (mddev
->bitmap
) {
1945 /* If adding to array with a bitmap, then we can accept an
1946 * older device, but not too old.
1948 if (ev1
< mddev
->bitmap
->events_cleared
)
1950 if (ev1
< mddev
->events
)
1951 set_bit(Bitmap_sync
, &rdev
->flags
);
1953 if (ev1
< mddev
->events
)
1954 /* just a hot-add of a new device, leave raid_disk at -1 */
1957 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1959 if (rdev
->desc_nr
< 0 ||
1960 rdev
->desc_nr
>= le32_to_cpu(sb
->max_dev
)) {
1961 role
= MD_DISK_ROLE_SPARE
;
1964 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
1966 case MD_DISK_ROLE_SPARE
: /* spare */
1968 case MD_DISK_ROLE_FAULTY
: /* faulty */
1969 set_bit(Faulty
, &rdev
->flags
);
1971 case MD_DISK_ROLE_JOURNAL
: /* journal device */
1972 if (!(le32_to_cpu(sb
->feature_map
) & MD_FEATURE_JOURNAL
)) {
1973 /* journal device without journal feature */
1974 pr_warn("md: journal device provided without journal feature, ignoring the device\n");
1977 set_bit(Journal
, &rdev
->flags
);
1978 rdev
->journal_tail
= le64_to_cpu(sb
->journal_tail
);
1979 rdev
->raid_disk
= 0;
1982 rdev
->saved_raid_disk
= role
;
1983 if ((le32_to_cpu(sb
->feature_map
) &
1984 MD_FEATURE_RECOVERY_OFFSET
)) {
1985 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
1986 if (!(le32_to_cpu(sb
->feature_map
) &
1987 MD_FEATURE_RECOVERY_BITMAP
))
1988 rdev
->saved_raid_disk
= -1;
1991 * If the array is FROZEN, then the device can't
1992 * be in_sync with rest of array.
1994 if (!test_bit(MD_RECOVERY_FROZEN
,
1996 set_bit(In_sync
, &rdev
->flags
);
1998 rdev
->raid_disk
= role
;
2001 if (sb
->devflags
& WriteMostly1
)
2002 set_bit(WriteMostly
, &rdev
->flags
);
2003 if (sb
->devflags
& FailFast1
)
2004 set_bit(FailFast
, &rdev
->flags
);
2005 if (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_REPLACEMENT
)
2006 set_bit(Replacement
, &rdev
->flags
);
2007 } else /* MULTIPATH are always insync */
2008 set_bit(In_sync
, &rdev
->flags
);
2013 static void super_1_sync(struct mddev
*mddev
, struct md_rdev
*rdev
)
2015 struct mdp_superblock_1
*sb
;
2016 struct md_rdev
*rdev2
;
2018 /* make rdev->sb match mddev and rdev data. */
2020 sb
= page_address(rdev
->sb_page
);
2022 sb
->feature_map
= 0;
2024 sb
->recovery_offset
= cpu_to_le64(0);
2025 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
2027 sb
->utime
= cpu_to_le64((__u64
)mddev
->utime
);
2028 sb
->events
= cpu_to_le64(mddev
->events
);
2030 sb
->resync_offset
= cpu_to_le64(mddev
->recovery_cp
);
2031 else if (test_bit(MD_JOURNAL_CLEAN
, &mddev
->flags
))
2032 sb
->resync_offset
= cpu_to_le64(MaxSector
);
2034 sb
->resync_offset
= cpu_to_le64(0);
2036 sb
->cnt_corrected_read
= cpu_to_le32(atomic_read(&rdev
->corrected_errors
));
2038 sb
->raid_disks
= cpu_to_le32(mddev
->raid_disks
);
2039 sb
->size
= cpu_to_le64(mddev
->dev_sectors
);
2040 sb
->chunksize
= cpu_to_le32(mddev
->chunk_sectors
);
2041 sb
->level
= cpu_to_le32(mddev
->level
);
2042 sb
->layout
= cpu_to_le32(mddev
->layout
);
2043 if (test_bit(FailFast
, &rdev
->flags
))
2044 sb
->devflags
|= FailFast1
;
2046 sb
->devflags
&= ~FailFast1
;
2048 if (test_bit(WriteMostly
, &rdev
->flags
))
2049 sb
->devflags
|= WriteMostly1
;
2051 sb
->devflags
&= ~WriteMostly1
;
2052 sb
->data_offset
= cpu_to_le64(rdev
->data_offset
);
2053 sb
->data_size
= cpu_to_le64(rdev
->sectors
);
2055 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
) {
2056 sb
->bitmap_offset
= cpu_to_le32((__u32
)mddev
->bitmap_info
.offset
);
2057 sb
->feature_map
= cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
);
2060 if (rdev
->raid_disk
>= 0 && !test_bit(Journal
, &rdev
->flags
) &&
2061 !test_bit(In_sync
, &rdev
->flags
)) {
2063 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET
);
2064 sb
->recovery_offset
=
2065 cpu_to_le64(rdev
->recovery_offset
);
2066 if (rdev
->saved_raid_disk
>= 0 && mddev
->bitmap
)
2068 cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP
);
2070 /* Note: recovery_offset and journal_tail share space */
2071 if (test_bit(Journal
, &rdev
->flags
))
2072 sb
->journal_tail
= cpu_to_le64(rdev
->journal_tail
);
2073 if (test_bit(Replacement
, &rdev
->flags
))
2075 cpu_to_le32(MD_FEATURE_REPLACEMENT
);
2077 if (mddev
->reshape_position
!= MaxSector
) {
2078 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE
);
2079 sb
->reshape_position
= cpu_to_le64(mddev
->reshape_position
);
2080 sb
->new_layout
= cpu_to_le32(mddev
->new_layout
);
2081 sb
->delta_disks
= cpu_to_le32(mddev
->delta_disks
);
2082 sb
->new_level
= cpu_to_le32(mddev
->new_level
);
2083 sb
->new_chunk
= cpu_to_le32(mddev
->new_chunk_sectors
);
2084 if (mddev
->delta_disks
== 0 &&
2085 mddev
->reshape_backwards
)
2087 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS
);
2088 if (rdev
->new_data_offset
!= rdev
->data_offset
) {
2090 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET
);
2091 sb
->new_offset
= cpu_to_le32((__u32
)(rdev
->new_data_offset
2092 - rdev
->data_offset
));
2096 if (mddev_is_clustered(mddev
))
2097 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_CLUSTERED
);
2099 if (rdev
->badblocks
.count
== 0)
2100 /* Nothing to do for bad blocks*/ ;
2101 else if (sb
->bblog_offset
== 0)
2102 /* Cannot record bad blocks on this device */
2103 md_error(mddev
, rdev
);
2105 struct badblocks
*bb
= &rdev
->badblocks
;
2106 __le64
*bbp
= (__le64
*)page_address(rdev
->bb_page
);
2108 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_BAD_BLOCKS
);
2113 seq
= read_seqbegin(&bb
->lock
);
2115 memset(bbp
, 0xff, PAGE_SIZE
);
2117 for (i
= 0 ; i
< bb
->count
; i
++) {
2118 u64 internal_bb
= p
[i
];
2119 u64 store_bb
= ((BB_OFFSET(internal_bb
) << 10)
2120 | BB_LEN(internal_bb
));
2121 bbp
[i
] = cpu_to_le64(store_bb
);
2124 if (read_seqretry(&bb
->lock
, seq
))
2127 bb
->sector
= (rdev
->sb_start
+
2128 (int)le32_to_cpu(sb
->bblog_offset
));
2129 bb
->size
= le16_to_cpu(sb
->bblog_size
);
2134 rdev_for_each(rdev2
, mddev
)
2135 if (rdev2
->desc_nr
+1 > max_dev
)
2136 max_dev
= rdev2
->desc_nr
+1;
2138 if (max_dev
> le32_to_cpu(sb
->max_dev
)) {
2140 sb
->max_dev
= cpu_to_le32(max_dev
);
2141 rdev
->sb_size
= max_dev
* 2 + 256;
2142 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
2143 if (rdev
->sb_size
& bmask
)
2144 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
2146 max_dev
= le32_to_cpu(sb
->max_dev
);
2148 for (i
=0; i
<max_dev
;i
++)
2149 sb
->dev_roles
[i
] = cpu_to_le16(MD_DISK_ROLE_SPARE
);
2151 if (test_bit(MD_HAS_JOURNAL
, &mddev
->flags
))
2152 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_JOURNAL
);
2154 if (test_bit(MD_HAS_PPL
, &mddev
->flags
)) {
2155 if (test_bit(MD_HAS_MULTIPLE_PPLS
, &mddev
->flags
))
2157 cpu_to_le32(MD_FEATURE_MULTIPLE_PPLS
);
2159 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_PPL
);
2160 sb
->ppl
.offset
= cpu_to_le16(rdev
->ppl
.offset
);
2161 sb
->ppl
.size
= cpu_to_le16(rdev
->ppl
.size
);
2164 rdev_for_each(rdev2
, mddev
) {
2166 if (test_bit(Faulty
, &rdev2
->flags
))
2167 sb
->dev_roles
[i
] = cpu_to_le16(MD_DISK_ROLE_FAULTY
);
2168 else if (test_bit(In_sync
, &rdev2
->flags
))
2169 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
2170 else if (test_bit(Journal
, &rdev2
->flags
))
2171 sb
->dev_roles
[i
] = cpu_to_le16(MD_DISK_ROLE_JOURNAL
);
2172 else if (rdev2
->raid_disk
>= 0)
2173 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
2175 sb
->dev_roles
[i
] = cpu_to_le16(MD_DISK_ROLE_SPARE
);
2178 sb
->sb_csum
= calc_sb_1_csum(sb
);
2181 static sector_t
super_1_choose_bm_space(sector_t dev_size
)
2185 /* if the device is bigger than 8Gig, save 64k for bitmap
2186 * usage, if bigger than 200Gig, save 128k
2188 if (dev_size
< 64*2)
2190 else if (dev_size
- 64*2 >= 200*1024*1024*2)
2192 else if (dev_size
- 4*2 > 8*1024*1024*2)
2199 static unsigned long long
2200 super_1_rdev_size_change(struct md_rdev
*rdev
, sector_t num_sectors
)
2202 struct mdp_superblock_1
*sb
;
2203 sector_t max_sectors
;
2204 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
2205 return 0; /* component must fit device */
2206 if (rdev
->data_offset
!= rdev
->new_data_offset
)
2207 return 0; /* too confusing */
2208 if (rdev
->sb_start
< rdev
->data_offset
) {
2209 /* minor versions 1 and 2; superblock before data */
2210 max_sectors
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
2211 max_sectors
-= rdev
->data_offset
;
2212 if (!num_sectors
|| num_sectors
> max_sectors
)
2213 num_sectors
= max_sectors
;
2214 } else if (rdev
->mddev
->bitmap_info
.offset
) {
2215 /* minor version 0 with bitmap we can't move */
2218 /* minor version 0; superblock after data */
2219 sector_t sb_start
, bm_space
;
2220 sector_t dev_size
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
2222 /* 8K is for superblock */
2223 sb_start
= dev_size
- 8*2;
2224 sb_start
&= ~(sector_t
)(4*2 - 1);
2226 bm_space
= super_1_choose_bm_space(dev_size
);
2228 /* Space that can be used to store date needs to decrease
2229 * superblock bitmap space and bad block space(4K)
2231 max_sectors
= sb_start
- bm_space
- 4*2;
2233 if (!num_sectors
|| num_sectors
> max_sectors
)
2234 num_sectors
= max_sectors
;
2236 sb
= page_address(rdev
->sb_page
);
2237 sb
->data_size
= cpu_to_le64(num_sectors
);
2238 sb
->super_offset
= cpu_to_le64(rdev
->sb_start
);
2239 sb
->sb_csum
= calc_sb_1_csum(sb
);
2241 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
2243 } while (md_super_wait(rdev
->mddev
) < 0);
2249 super_1_allow_new_offset(struct md_rdev
*rdev
,
2250 unsigned long long new_offset
)
2252 /* All necessary checks on new >= old have been done */
2253 struct bitmap
*bitmap
;
2254 if (new_offset
>= rdev
->data_offset
)
2257 /* with 1.0 metadata, there is no metadata to tread on
2258 * so we can always move back */
2259 if (rdev
->mddev
->minor_version
== 0)
2262 /* otherwise we must be sure not to step on
2263 * any metadata, so stay:
2264 * 36K beyond start of superblock
2265 * beyond end of badblocks
2266 * beyond write-intent bitmap
2268 if (rdev
->sb_start
+ (32+4)*2 > new_offset
)
2270 bitmap
= rdev
->mddev
->bitmap
;
2271 if (bitmap
&& !rdev
->mddev
->bitmap_info
.file
&&
2272 rdev
->sb_start
+ rdev
->mddev
->bitmap_info
.offset
+
2273 bitmap
->storage
.file_pages
* (PAGE_SIZE
>>9) > new_offset
)
2275 if (rdev
->badblocks
.sector
+ rdev
->badblocks
.size
> new_offset
)
2281 static struct super_type super_types
[] = {
2284 .owner
= THIS_MODULE
,
2285 .load_super
= super_90_load
,
2286 .validate_super
= super_90_validate
,
2287 .sync_super
= super_90_sync
,
2288 .rdev_size_change
= super_90_rdev_size_change
,
2289 .allow_new_offset
= super_90_allow_new_offset
,
2293 .owner
= THIS_MODULE
,
2294 .load_super
= super_1_load
,
2295 .validate_super
= super_1_validate
,
2296 .sync_super
= super_1_sync
,
2297 .rdev_size_change
= super_1_rdev_size_change
,
2298 .allow_new_offset
= super_1_allow_new_offset
,
2302 static void sync_super(struct mddev
*mddev
, struct md_rdev
*rdev
)
2304 if (mddev
->sync_super
) {
2305 mddev
->sync_super(mddev
, rdev
);
2309 BUG_ON(mddev
->major_version
>= ARRAY_SIZE(super_types
));
2311 super_types
[mddev
->major_version
].sync_super(mddev
, rdev
);
2314 static int match_mddev_units(struct mddev
*mddev1
, struct mddev
*mddev2
)
2316 struct md_rdev
*rdev
, *rdev2
;
2319 rdev_for_each_rcu(rdev
, mddev1
) {
2320 if (test_bit(Faulty
, &rdev
->flags
) ||
2321 test_bit(Journal
, &rdev
->flags
) ||
2322 rdev
->raid_disk
== -1)
2324 rdev_for_each_rcu(rdev2
, mddev2
) {
2325 if (test_bit(Faulty
, &rdev2
->flags
) ||
2326 test_bit(Journal
, &rdev2
->flags
) ||
2327 rdev2
->raid_disk
== -1)
2329 if (rdev
->bdev
->bd_disk
== rdev2
->bdev
->bd_disk
) {
2339 static LIST_HEAD(pending_raid_disks
);
2342 * Try to register data integrity profile for an mddev
2344 * This is called when an array is started and after a disk has been kicked
2345 * from the array. It only succeeds if all working and active component devices
2346 * are integrity capable with matching profiles.
2348 int md_integrity_register(struct mddev
*mddev
)
2350 struct md_rdev
*rdev
, *reference
= NULL
;
2352 if (list_empty(&mddev
->disks
))
2353 return 0; /* nothing to do */
2354 if (!mddev
->gendisk
|| blk_get_integrity(mddev
->gendisk
))
2355 return 0; /* shouldn't register, or already is */
2356 rdev_for_each(rdev
, mddev
) {
2357 /* skip spares and non-functional disks */
2358 if (test_bit(Faulty
, &rdev
->flags
))
2360 if (rdev
->raid_disk
< 0)
2363 /* Use the first rdev as the reference */
2367 /* does this rdev's profile match the reference profile? */
2368 if (blk_integrity_compare(reference
->bdev
->bd_disk
,
2369 rdev
->bdev
->bd_disk
) < 0)
2372 if (!reference
|| !bdev_get_integrity(reference
->bdev
))
2375 * All component devices are integrity capable and have matching
2376 * profiles, register the common profile for the md device.
2378 blk_integrity_register(mddev
->gendisk
,
2379 bdev_get_integrity(reference
->bdev
));
2381 pr_debug("md: data integrity enabled on %s\n", mdname(mddev
));
2382 if (bioset_integrity_create(&mddev
->bio_set
, BIO_POOL_SIZE
)) {
2383 pr_err("md: failed to create integrity pool for %s\n",
2389 EXPORT_SYMBOL(md_integrity_register
);
2392 * Attempt to add an rdev, but only if it is consistent with the current
2395 int md_integrity_add_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
2397 struct blk_integrity
*bi_mddev
;
2398 char name
[BDEVNAME_SIZE
];
2400 if (!mddev
->gendisk
)
2403 bi_mddev
= blk_get_integrity(mddev
->gendisk
);
2405 if (!bi_mddev
) /* nothing to do */
2408 if (blk_integrity_compare(mddev
->gendisk
, rdev
->bdev
->bd_disk
) != 0) {
2409 pr_err("%s: incompatible integrity profile for %s\n",
2410 mdname(mddev
), bdevname(rdev
->bdev
, name
));
2416 EXPORT_SYMBOL(md_integrity_add_rdev
);
2418 static bool rdev_read_only(struct md_rdev
*rdev
)
2420 return bdev_read_only(rdev
->bdev
) ||
2421 (rdev
->meta_bdev
&& bdev_read_only(rdev
->meta_bdev
));
2424 static int bind_rdev_to_array(struct md_rdev
*rdev
, struct mddev
*mddev
)
2426 char b
[BDEVNAME_SIZE
];
2429 /* prevent duplicates */
2430 if (find_rdev(mddev
, rdev
->bdev
->bd_dev
))
2433 if (rdev_read_only(rdev
) && mddev
->pers
)
2436 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2437 if (!test_bit(Journal
, &rdev
->flags
) &&
2439 (mddev
->dev_sectors
== 0 || rdev
->sectors
< mddev
->dev_sectors
)) {
2441 /* Cannot change size, so fail
2442 * If mddev->level <= 0, then we don't care
2443 * about aligning sizes (e.g. linear)
2445 if (mddev
->level
> 0)
2448 mddev
->dev_sectors
= rdev
->sectors
;
2451 /* Verify rdev->desc_nr is unique.
2452 * If it is -1, assign a free number, else
2453 * check number is not in use
2456 if (rdev
->desc_nr
< 0) {
2459 choice
= mddev
->raid_disks
;
2460 while (md_find_rdev_nr_rcu(mddev
, choice
))
2462 rdev
->desc_nr
= choice
;
2464 if (md_find_rdev_nr_rcu(mddev
, rdev
->desc_nr
)) {
2470 if (!test_bit(Journal
, &rdev
->flags
) &&
2471 mddev
->max_disks
&& rdev
->desc_nr
>= mddev
->max_disks
) {
2472 pr_warn("md: %s: array is limited to %d devices\n",
2473 mdname(mddev
), mddev
->max_disks
);
2476 bdevname(rdev
->bdev
,b
);
2477 strreplace(b
, '/', '!');
2479 rdev
->mddev
= mddev
;
2480 pr_debug("md: bind<%s>\n", b
);
2482 if (mddev
->raid_disks
)
2483 mddev_create_serial_pool(mddev
, rdev
, false);
2485 if ((err
= kobject_add(&rdev
->kobj
, &mddev
->kobj
, "dev-%s", b
)))
2488 /* failure here is OK */
2489 err
= sysfs_create_link(&rdev
->kobj
, bdev_kobj(rdev
->bdev
), "block");
2490 rdev
->sysfs_state
= sysfs_get_dirent_safe(rdev
->kobj
.sd
, "state");
2491 rdev
->sysfs_unack_badblocks
=
2492 sysfs_get_dirent_safe(rdev
->kobj
.sd
, "unacknowledged_bad_blocks");
2493 rdev
->sysfs_badblocks
=
2494 sysfs_get_dirent_safe(rdev
->kobj
.sd
, "bad_blocks");
2496 list_add_rcu(&rdev
->same_set
, &mddev
->disks
);
2497 bd_link_disk_holder(rdev
->bdev
, mddev
->gendisk
);
2499 /* May as well allow recovery to be retried once */
2500 mddev
->recovery_disabled
++;
2505 pr_warn("md: failed to register dev-%s for %s\n",
2510 static void rdev_delayed_delete(struct work_struct
*ws
)
2512 struct md_rdev
*rdev
= container_of(ws
, struct md_rdev
, del_work
);
2513 kobject_del(&rdev
->kobj
);
2514 kobject_put(&rdev
->kobj
);
2517 static void unbind_rdev_from_array(struct md_rdev
*rdev
)
2519 char b
[BDEVNAME_SIZE
];
2521 bd_unlink_disk_holder(rdev
->bdev
, rdev
->mddev
->gendisk
);
2522 list_del_rcu(&rdev
->same_set
);
2523 pr_debug("md: unbind<%s>\n", bdevname(rdev
->bdev
,b
));
2524 mddev_destroy_serial_pool(rdev
->mddev
, rdev
, false);
2526 sysfs_remove_link(&rdev
->kobj
, "block");
2527 sysfs_put(rdev
->sysfs_state
);
2528 sysfs_put(rdev
->sysfs_unack_badblocks
);
2529 sysfs_put(rdev
->sysfs_badblocks
);
2530 rdev
->sysfs_state
= NULL
;
2531 rdev
->sysfs_unack_badblocks
= NULL
;
2532 rdev
->sysfs_badblocks
= NULL
;
2533 rdev
->badblocks
.count
= 0;
2534 /* We need to delay this, otherwise we can deadlock when
2535 * writing to 'remove' to "dev/state". We also need
2536 * to delay it due to rcu usage.
2539 INIT_WORK(&rdev
->del_work
, rdev_delayed_delete
);
2540 kobject_get(&rdev
->kobj
);
2541 queue_work(md_rdev_misc_wq
, &rdev
->del_work
);
2545 * prevent the device from being mounted, repartitioned or
2546 * otherwise reused by a RAID array (or any other kernel
2547 * subsystem), by bd_claiming the device.
2549 static int lock_rdev(struct md_rdev
*rdev
, dev_t dev
, int shared
)
2552 struct block_device
*bdev
;
2554 bdev
= blkdev_get_by_dev(dev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
,
2555 shared
? (struct md_rdev
*)lock_rdev
: rdev
);
2557 pr_warn("md: could not open device unknown-block(%u,%u).\n",
2558 MAJOR(dev
), MINOR(dev
));
2559 return PTR_ERR(bdev
);
2565 static void unlock_rdev(struct md_rdev
*rdev
)
2567 struct block_device
*bdev
= rdev
->bdev
;
2569 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
);
2572 void md_autodetect_dev(dev_t dev
);
2574 static void export_rdev(struct md_rdev
*rdev
)
2576 char b
[BDEVNAME_SIZE
];
2578 pr_debug("md: export_rdev(%s)\n", bdevname(rdev
->bdev
,b
));
2579 md_rdev_clear(rdev
);
2581 if (test_bit(AutoDetected
, &rdev
->flags
))
2582 md_autodetect_dev(rdev
->bdev
->bd_dev
);
2585 kobject_put(&rdev
->kobj
);
2588 void md_kick_rdev_from_array(struct md_rdev
*rdev
)
2590 unbind_rdev_from_array(rdev
);
2593 EXPORT_SYMBOL_GPL(md_kick_rdev_from_array
);
2595 static void export_array(struct mddev
*mddev
)
2597 struct md_rdev
*rdev
;
2599 while (!list_empty(&mddev
->disks
)) {
2600 rdev
= list_first_entry(&mddev
->disks
, struct md_rdev
,
2602 md_kick_rdev_from_array(rdev
);
2604 mddev
->raid_disks
= 0;
2605 mddev
->major_version
= 0;
2608 static bool set_in_sync(struct mddev
*mddev
)
2610 lockdep_assert_held(&mddev
->lock
);
2611 if (!mddev
->in_sync
) {
2612 mddev
->sync_checkers
++;
2613 spin_unlock(&mddev
->lock
);
2614 percpu_ref_switch_to_atomic_sync(&mddev
->writes_pending
);
2615 spin_lock(&mddev
->lock
);
2616 if (!mddev
->in_sync
&&
2617 percpu_ref_is_zero(&mddev
->writes_pending
)) {
2620 * Ensure ->in_sync is visible before we clear
2624 set_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
2625 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
2627 if (--mddev
->sync_checkers
== 0)
2628 percpu_ref_switch_to_percpu(&mddev
->writes_pending
);
2630 if (mddev
->safemode
== 1)
2631 mddev
->safemode
= 0;
2632 return mddev
->in_sync
;
2635 static void sync_sbs(struct mddev
*mddev
, int nospares
)
2637 /* Update each superblock (in-memory image), but
2638 * if we are allowed to, skip spares which already
2639 * have the right event counter, or have one earlier
2640 * (which would mean they aren't being marked as dirty
2641 * with the rest of the array)
2643 struct md_rdev
*rdev
;
2644 rdev_for_each(rdev
, mddev
) {
2645 if (rdev
->sb_events
== mddev
->events
||
2647 rdev
->raid_disk
< 0 &&
2648 rdev
->sb_events
+1 == mddev
->events
)) {
2649 /* Don't update this superblock */
2650 rdev
->sb_loaded
= 2;
2652 sync_super(mddev
, rdev
);
2653 rdev
->sb_loaded
= 1;
2658 static bool does_sb_need_changing(struct mddev
*mddev
)
2660 struct md_rdev
*rdev
;
2661 struct mdp_superblock_1
*sb
;
2664 /* Find a good rdev */
2665 rdev_for_each(rdev
, mddev
)
2666 if ((rdev
->raid_disk
>= 0) && !test_bit(Faulty
, &rdev
->flags
))
2669 /* No good device found. */
2673 sb
= page_address(rdev
->sb_page
);
2674 /* Check if a device has become faulty or a spare become active */
2675 rdev_for_each(rdev
, mddev
) {
2676 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
2677 /* Device activated? */
2678 if (role
== 0xffff && rdev
->raid_disk
>=0 &&
2679 !test_bit(Faulty
, &rdev
->flags
))
2681 /* Device turned faulty? */
2682 if (test_bit(Faulty
, &rdev
->flags
) && (role
< 0xfffd))
2686 /* Check if any mddev parameters have changed */
2687 if ((mddev
->dev_sectors
!= le64_to_cpu(sb
->size
)) ||
2688 (mddev
->reshape_position
!= le64_to_cpu(sb
->reshape_position
)) ||
2689 (mddev
->layout
!= le32_to_cpu(sb
->layout
)) ||
2690 (mddev
->raid_disks
!= le32_to_cpu(sb
->raid_disks
)) ||
2691 (mddev
->chunk_sectors
!= le32_to_cpu(sb
->chunksize
)))
2697 void md_update_sb(struct mddev
*mddev
, int force_change
)
2699 struct md_rdev
*rdev
;
2702 int any_badblocks_changed
= 0;
2707 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
2712 if (mddev_is_clustered(mddev
)) {
2713 if (test_and_clear_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
))
2715 if (test_and_clear_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
))
2717 ret
= md_cluster_ops
->metadata_update_start(mddev
);
2718 /* Has someone else has updated the sb */
2719 if (!does_sb_need_changing(mddev
)) {
2721 md_cluster_ops
->metadata_update_cancel(mddev
);
2722 bit_clear_unless(&mddev
->sb_flags
, BIT(MD_SB_CHANGE_PENDING
),
2723 BIT(MD_SB_CHANGE_DEVS
) |
2724 BIT(MD_SB_CHANGE_CLEAN
));
2730 * First make sure individual recovery_offsets are correct
2731 * curr_resync_completed can only be used during recovery.
2732 * During reshape/resync it might use array-addresses rather
2733 * that device addresses.
2735 rdev_for_each(rdev
, mddev
) {
2736 if (rdev
->raid_disk
>= 0 &&
2737 mddev
->delta_disks
>= 0 &&
2738 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
2739 test_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
) &&
2740 !test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
2741 !test_bit(Journal
, &rdev
->flags
) &&
2742 !test_bit(In_sync
, &rdev
->flags
) &&
2743 mddev
->curr_resync_completed
> rdev
->recovery_offset
)
2744 rdev
->recovery_offset
= mddev
->curr_resync_completed
;
2747 if (!mddev
->persistent
) {
2748 clear_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
2749 clear_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
2750 if (!mddev
->external
) {
2751 clear_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
2752 rdev_for_each(rdev
, mddev
) {
2753 if (rdev
->badblocks
.changed
) {
2754 rdev
->badblocks
.changed
= 0;
2755 ack_all_badblocks(&rdev
->badblocks
);
2756 md_error(mddev
, rdev
);
2758 clear_bit(Blocked
, &rdev
->flags
);
2759 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2760 wake_up(&rdev
->blocked_wait
);
2763 wake_up(&mddev
->sb_wait
);
2767 spin_lock(&mddev
->lock
);
2769 mddev
->utime
= ktime_get_real_seconds();
2771 if (test_and_clear_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
))
2773 if (test_and_clear_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
))
2774 /* just a clean<-> dirty transition, possibly leave spares alone,
2775 * though if events isn't the right even/odd, we will have to do
2781 if (mddev
->degraded
)
2782 /* If the array is degraded, then skipping spares is both
2783 * dangerous and fairly pointless.
2784 * Dangerous because a device that was removed from the array
2785 * might have a event_count that still looks up-to-date,
2786 * so it can be re-added without a resync.
2787 * Pointless because if there are any spares to skip,
2788 * then a recovery will happen and soon that array won't
2789 * be degraded any more and the spare can go back to sleep then.
2793 sync_req
= mddev
->in_sync
;
2795 /* If this is just a dirty<->clean transition, and the array is clean
2796 * and 'events' is odd, we can roll back to the previous clean state */
2798 && (mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
2799 && mddev
->can_decrease_events
2800 && mddev
->events
!= 1) {
2802 mddev
->can_decrease_events
= 0;
2804 /* otherwise we have to go forward and ... */
2806 mddev
->can_decrease_events
= nospares
;
2810 * This 64-bit counter should never wrap.
2811 * Either we are in around ~1 trillion A.C., assuming
2812 * 1 reboot per second, or we have a bug...
2814 WARN_ON(mddev
->events
== 0);
2816 rdev_for_each(rdev
, mddev
) {
2817 if (rdev
->badblocks
.changed
)
2818 any_badblocks_changed
++;
2819 if (test_bit(Faulty
, &rdev
->flags
))
2820 set_bit(FaultRecorded
, &rdev
->flags
);
2823 sync_sbs(mddev
, nospares
);
2824 spin_unlock(&mddev
->lock
);
2826 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2827 mdname(mddev
), mddev
->in_sync
);
2830 blk_add_trace_msg(mddev
->queue
, "md md_update_sb");
2832 md_bitmap_update_sb(mddev
->bitmap
);
2833 rdev_for_each(rdev
, mddev
) {
2834 char b
[BDEVNAME_SIZE
];
2836 if (rdev
->sb_loaded
!= 1)
2837 continue; /* no noise on spare devices */
2839 if (!test_bit(Faulty
, &rdev
->flags
)) {
2840 md_super_write(mddev
,rdev
,
2841 rdev
->sb_start
, rdev
->sb_size
,
2843 pr_debug("md: (write) %s's sb offset: %llu\n",
2844 bdevname(rdev
->bdev
, b
),
2845 (unsigned long long)rdev
->sb_start
);
2846 rdev
->sb_events
= mddev
->events
;
2847 if (rdev
->badblocks
.size
) {
2848 md_super_write(mddev
, rdev
,
2849 rdev
->badblocks
.sector
,
2850 rdev
->badblocks
.size
<< 9,
2852 rdev
->badblocks
.size
= 0;
2856 pr_debug("md: %s (skipping faulty)\n",
2857 bdevname(rdev
->bdev
, b
));
2859 if (mddev
->level
== LEVEL_MULTIPATH
)
2860 /* only need to write one superblock... */
2863 if (md_super_wait(mddev
) < 0)
2865 /* if there was a failure, MD_SB_CHANGE_DEVS was set, and we re-write super */
2867 if (mddev_is_clustered(mddev
) && ret
== 0)
2868 md_cluster_ops
->metadata_update_finish(mddev
);
2870 if (mddev
->in_sync
!= sync_req
||
2871 !bit_clear_unless(&mddev
->sb_flags
, BIT(MD_SB_CHANGE_PENDING
),
2872 BIT(MD_SB_CHANGE_DEVS
) | BIT(MD_SB_CHANGE_CLEAN
)))
2873 /* have to write it out again */
2875 wake_up(&mddev
->sb_wait
);
2876 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
2877 sysfs_notify_dirent_safe(mddev
->sysfs_completed
);
2879 rdev_for_each(rdev
, mddev
) {
2880 if (test_and_clear_bit(FaultRecorded
, &rdev
->flags
))
2881 clear_bit(Blocked
, &rdev
->flags
);
2883 if (any_badblocks_changed
)
2884 ack_all_badblocks(&rdev
->badblocks
);
2885 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2886 wake_up(&rdev
->blocked_wait
);
2889 EXPORT_SYMBOL(md_update_sb
);
2891 static int add_bound_rdev(struct md_rdev
*rdev
)
2893 struct mddev
*mddev
= rdev
->mddev
;
2895 bool add_journal
= test_bit(Journal
, &rdev
->flags
);
2897 if (!mddev
->pers
->hot_remove_disk
|| add_journal
) {
2898 /* If there is hot_add_disk but no hot_remove_disk
2899 * then added disks for geometry changes,
2900 * and should be added immediately.
2902 super_types
[mddev
->major_version
].
2903 validate_super(mddev
, rdev
);
2905 mddev_suspend(mddev
);
2906 err
= mddev
->pers
->hot_add_disk(mddev
, rdev
);
2908 mddev_resume(mddev
);
2910 md_kick_rdev_from_array(rdev
);
2914 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2916 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
2917 if (mddev
->degraded
)
2918 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
2919 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
2920 md_new_event(mddev
);
2921 md_wakeup_thread(mddev
->thread
);
2925 /* words written to sysfs files may, or may not, be \n terminated.
2926 * We want to accept with case. For this we use cmd_match.
2928 static int cmd_match(const char *cmd
, const char *str
)
2930 /* See if cmd, written into a sysfs file, matches
2931 * str. They must either be the same, or cmd can
2932 * have a trailing newline
2934 while (*cmd
&& *str
&& *cmd
== *str
) {
2945 struct rdev_sysfs_entry
{
2946 struct attribute attr
;
2947 ssize_t (*show
)(struct md_rdev
*, char *);
2948 ssize_t (*store
)(struct md_rdev
*, const char *, size_t);
2952 state_show(struct md_rdev
*rdev
, char *page
)
2956 unsigned long flags
= READ_ONCE(rdev
->flags
);
2958 if (test_bit(Faulty
, &flags
) ||
2959 (!test_bit(ExternalBbl
, &flags
) &&
2960 rdev
->badblocks
.unacked_exist
))
2961 len
+= sprintf(page
+len
, "faulty%s", sep
);
2962 if (test_bit(In_sync
, &flags
))
2963 len
+= sprintf(page
+len
, "in_sync%s", sep
);
2964 if (test_bit(Journal
, &flags
))
2965 len
+= sprintf(page
+len
, "journal%s", sep
);
2966 if (test_bit(WriteMostly
, &flags
))
2967 len
+= sprintf(page
+len
, "write_mostly%s", sep
);
2968 if (test_bit(Blocked
, &flags
) ||
2969 (rdev
->badblocks
.unacked_exist
2970 && !test_bit(Faulty
, &flags
)))
2971 len
+= sprintf(page
+len
, "blocked%s", sep
);
2972 if (!test_bit(Faulty
, &flags
) &&
2973 !test_bit(Journal
, &flags
) &&
2974 !test_bit(In_sync
, &flags
))
2975 len
+= sprintf(page
+len
, "spare%s", sep
);
2976 if (test_bit(WriteErrorSeen
, &flags
))
2977 len
+= sprintf(page
+len
, "write_error%s", sep
);
2978 if (test_bit(WantReplacement
, &flags
))
2979 len
+= sprintf(page
+len
, "want_replacement%s", sep
);
2980 if (test_bit(Replacement
, &flags
))
2981 len
+= sprintf(page
+len
, "replacement%s", sep
);
2982 if (test_bit(ExternalBbl
, &flags
))
2983 len
+= sprintf(page
+len
, "external_bbl%s", sep
);
2984 if (test_bit(FailFast
, &flags
))
2985 len
+= sprintf(page
+len
, "failfast%s", sep
);
2990 return len
+sprintf(page
+len
, "\n");
2994 state_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2997 * faulty - simulates an error
2998 * remove - disconnects the device
2999 * writemostly - sets write_mostly
3000 * -writemostly - clears write_mostly
3001 * blocked - sets the Blocked flags
3002 * -blocked - clears the Blocked and possibly simulates an error
3003 * insync - sets Insync providing device isn't active
3004 * -insync - clear Insync for a device with a slot assigned,
3005 * so that it gets rebuilt based on bitmap
3006 * write_error - sets WriteErrorSeen
3007 * -write_error - clears WriteErrorSeen
3008 * {,-}failfast - set/clear FailFast
3011 if (cmd_match(buf
, "faulty") && rdev
->mddev
->pers
) {
3012 md_error(rdev
->mddev
, rdev
);
3013 if (test_bit(Faulty
, &rdev
->flags
))
3017 } else if (cmd_match(buf
, "remove")) {
3018 if (rdev
->mddev
->pers
) {
3019 clear_bit(Blocked
, &rdev
->flags
);
3020 remove_and_add_spares(rdev
->mddev
, rdev
);
3022 if (rdev
->raid_disk
>= 0)
3025 struct mddev
*mddev
= rdev
->mddev
;
3027 if (mddev_is_clustered(mddev
))
3028 err
= md_cluster_ops
->remove_disk(mddev
, rdev
);
3031 md_kick_rdev_from_array(rdev
);
3033 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
3034 md_wakeup_thread(mddev
->thread
);
3036 md_new_event(mddev
);
3039 } else if (cmd_match(buf
, "writemostly")) {
3040 set_bit(WriteMostly
, &rdev
->flags
);
3041 mddev_create_serial_pool(rdev
->mddev
, rdev
, false);
3043 } else if (cmd_match(buf
, "-writemostly")) {
3044 mddev_destroy_serial_pool(rdev
->mddev
, rdev
, false);
3045 clear_bit(WriteMostly
, &rdev
->flags
);
3047 } else if (cmd_match(buf
, "blocked")) {
3048 set_bit(Blocked
, &rdev
->flags
);
3050 } else if (cmd_match(buf
, "-blocked")) {
3051 if (!test_bit(Faulty
, &rdev
->flags
) &&
3052 !test_bit(ExternalBbl
, &rdev
->flags
) &&
3053 rdev
->badblocks
.unacked_exist
) {
3054 /* metadata handler doesn't understand badblocks,
3055 * so we need to fail the device
3057 md_error(rdev
->mddev
, rdev
);
3059 clear_bit(Blocked
, &rdev
->flags
);
3060 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
3061 wake_up(&rdev
->blocked_wait
);
3062 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
3063 md_wakeup_thread(rdev
->mddev
->thread
);
3066 } else if (cmd_match(buf
, "insync") && rdev
->raid_disk
== -1) {
3067 set_bit(In_sync
, &rdev
->flags
);
3069 } else if (cmd_match(buf
, "failfast")) {
3070 set_bit(FailFast
, &rdev
->flags
);
3072 } else if (cmd_match(buf
, "-failfast")) {
3073 clear_bit(FailFast
, &rdev
->flags
);
3075 } else if (cmd_match(buf
, "-insync") && rdev
->raid_disk
>= 0 &&
3076 !test_bit(Journal
, &rdev
->flags
)) {
3077 if (rdev
->mddev
->pers
== NULL
) {
3078 clear_bit(In_sync
, &rdev
->flags
);
3079 rdev
->saved_raid_disk
= rdev
->raid_disk
;
3080 rdev
->raid_disk
= -1;
3083 } else if (cmd_match(buf
, "write_error")) {
3084 set_bit(WriteErrorSeen
, &rdev
->flags
);
3086 } else if (cmd_match(buf
, "-write_error")) {
3087 clear_bit(WriteErrorSeen
, &rdev
->flags
);
3089 } else if (cmd_match(buf
, "want_replacement")) {
3090 /* Any non-spare device that is not a replacement can
3091 * become want_replacement at any time, but we then need to
3092 * check if recovery is needed.
3094 if (rdev
->raid_disk
>= 0 &&
3095 !test_bit(Journal
, &rdev
->flags
) &&
3096 !test_bit(Replacement
, &rdev
->flags
))
3097 set_bit(WantReplacement
, &rdev
->flags
);
3098 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
3099 md_wakeup_thread(rdev
->mddev
->thread
);
3101 } else if (cmd_match(buf
, "-want_replacement")) {
3102 /* Clearing 'want_replacement' is always allowed.
3103 * Once replacements starts it is too late though.
3106 clear_bit(WantReplacement
, &rdev
->flags
);
3107 } else if (cmd_match(buf
, "replacement")) {
3108 /* Can only set a device as a replacement when array has not
3109 * yet been started. Once running, replacement is automatic
3110 * from spares, or by assigning 'slot'.
3112 if (rdev
->mddev
->pers
)
3115 set_bit(Replacement
, &rdev
->flags
);
3118 } else if (cmd_match(buf
, "-replacement")) {
3119 /* Similarly, can only clear Replacement before start */
3120 if (rdev
->mddev
->pers
)
3123 clear_bit(Replacement
, &rdev
->flags
);
3126 } else if (cmd_match(buf
, "re-add")) {
3127 if (!rdev
->mddev
->pers
)
3129 else if (test_bit(Faulty
, &rdev
->flags
) && (rdev
->raid_disk
== -1) &&
3130 rdev
->saved_raid_disk
>= 0) {
3131 /* clear_bit is performed _after_ all the devices
3132 * have their local Faulty bit cleared. If any writes
3133 * happen in the meantime in the local node, they
3134 * will land in the local bitmap, which will be synced
3135 * by this node eventually
3137 if (!mddev_is_clustered(rdev
->mddev
) ||
3138 (err
= md_cluster_ops
->gather_bitmaps(rdev
)) == 0) {
3139 clear_bit(Faulty
, &rdev
->flags
);
3140 err
= add_bound_rdev(rdev
);
3144 } else if (cmd_match(buf
, "external_bbl") && (rdev
->mddev
->external
)) {
3145 set_bit(ExternalBbl
, &rdev
->flags
);
3146 rdev
->badblocks
.shift
= 0;
3148 } else if (cmd_match(buf
, "-external_bbl") && (rdev
->mddev
->external
)) {
3149 clear_bit(ExternalBbl
, &rdev
->flags
);
3153 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
3154 return err
? err
: len
;
3156 static struct rdev_sysfs_entry rdev_state
=
3157 __ATTR_PREALLOC(state
, S_IRUGO
|S_IWUSR
, state_show
, state_store
);
3160 errors_show(struct md_rdev
*rdev
, char *page
)
3162 return sprintf(page
, "%d\n", atomic_read(&rdev
->corrected_errors
));
3166 errors_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3171 rv
= kstrtouint(buf
, 10, &n
);
3174 atomic_set(&rdev
->corrected_errors
, n
);
3177 static struct rdev_sysfs_entry rdev_errors
=
3178 __ATTR(errors
, S_IRUGO
|S_IWUSR
, errors_show
, errors_store
);
3181 slot_show(struct md_rdev
*rdev
, char *page
)
3183 if (test_bit(Journal
, &rdev
->flags
))
3184 return sprintf(page
, "journal\n");
3185 else if (rdev
->raid_disk
< 0)
3186 return sprintf(page
, "none\n");
3188 return sprintf(page
, "%d\n", rdev
->raid_disk
);
3192 slot_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3197 if (test_bit(Journal
, &rdev
->flags
))
3199 if (strncmp(buf
, "none", 4)==0)
3202 err
= kstrtouint(buf
, 10, (unsigned int *)&slot
);
3206 if (rdev
->mddev
->pers
&& slot
== -1) {
3207 /* Setting 'slot' on an active array requires also
3208 * updating the 'rd%d' link, and communicating
3209 * with the personality with ->hot_*_disk.
3210 * For now we only support removing
3211 * failed/spare devices. This normally happens automatically,
3212 * but not when the metadata is externally managed.
3214 if (rdev
->raid_disk
== -1)
3216 /* personality does all needed checks */
3217 if (rdev
->mddev
->pers
->hot_remove_disk
== NULL
)
3219 clear_bit(Blocked
, &rdev
->flags
);
3220 remove_and_add_spares(rdev
->mddev
, rdev
);
3221 if (rdev
->raid_disk
>= 0)
3223 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
3224 md_wakeup_thread(rdev
->mddev
->thread
);
3225 } else if (rdev
->mddev
->pers
) {
3226 /* Activating a spare .. or possibly reactivating
3227 * if we ever get bitmaps working here.
3231 if (rdev
->raid_disk
!= -1)
3234 if (test_bit(MD_RECOVERY_RUNNING
, &rdev
->mddev
->recovery
))
3237 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
3240 if (slot
>= rdev
->mddev
->raid_disks
&&
3241 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
3244 rdev
->raid_disk
= slot
;
3245 if (test_bit(In_sync
, &rdev
->flags
))
3246 rdev
->saved_raid_disk
= slot
;
3248 rdev
->saved_raid_disk
= -1;
3249 clear_bit(In_sync
, &rdev
->flags
);
3250 clear_bit(Bitmap_sync
, &rdev
->flags
);
3251 err
= rdev
->mddev
->pers
->hot_add_disk(rdev
->mddev
, rdev
);
3253 rdev
->raid_disk
= -1;
3256 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
3257 /* failure here is OK */;
3258 sysfs_link_rdev(rdev
->mddev
, rdev
);
3259 /* don't wakeup anyone, leave that to userspace. */
3261 if (slot
>= rdev
->mddev
->raid_disks
&&
3262 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
3264 rdev
->raid_disk
= slot
;
3265 /* assume it is working */
3266 clear_bit(Faulty
, &rdev
->flags
);
3267 clear_bit(WriteMostly
, &rdev
->flags
);
3268 set_bit(In_sync
, &rdev
->flags
);
3269 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
3274 static struct rdev_sysfs_entry rdev_slot
=
3275 __ATTR(slot
, S_IRUGO
|S_IWUSR
, slot_show
, slot_store
);
3278 offset_show(struct md_rdev
*rdev
, char *page
)
3280 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->data_offset
);
3284 offset_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3286 unsigned long long offset
;
3287 if (kstrtoull(buf
, 10, &offset
) < 0)
3289 if (rdev
->mddev
->pers
&& rdev
->raid_disk
>= 0)
3291 if (rdev
->sectors
&& rdev
->mddev
->external
)
3292 /* Must set offset before size, so overlap checks
3295 rdev
->data_offset
= offset
;
3296 rdev
->new_data_offset
= offset
;
3300 static struct rdev_sysfs_entry rdev_offset
=
3301 __ATTR(offset
, S_IRUGO
|S_IWUSR
, offset_show
, offset_store
);
3303 static ssize_t
new_offset_show(struct md_rdev
*rdev
, char *page
)
3305 return sprintf(page
, "%llu\n",
3306 (unsigned long long)rdev
->new_data_offset
);
3309 static ssize_t
new_offset_store(struct md_rdev
*rdev
,
3310 const char *buf
, size_t len
)
3312 unsigned long long new_offset
;
3313 struct mddev
*mddev
= rdev
->mddev
;
3315 if (kstrtoull(buf
, 10, &new_offset
) < 0)
3318 if (mddev
->sync_thread
||
3319 test_bit(MD_RECOVERY_RUNNING
,&mddev
->recovery
))
3321 if (new_offset
== rdev
->data_offset
)
3322 /* reset is always permitted */
3324 else if (new_offset
> rdev
->data_offset
) {
3325 /* must not push array size beyond rdev_sectors */
3326 if (new_offset
- rdev
->data_offset
3327 + mddev
->dev_sectors
> rdev
->sectors
)
3330 /* Metadata worries about other space details. */
3332 /* decreasing the offset is inconsistent with a backwards
3335 if (new_offset
< rdev
->data_offset
&&
3336 mddev
->reshape_backwards
)
3338 /* Increasing offset is inconsistent with forwards
3339 * reshape. reshape_direction should be set to
3340 * 'backwards' first.
3342 if (new_offset
> rdev
->data_offset
&&
3343 !mddev
->reshape_backwards
)
3346 if (mddev
->pers
&& mddev
->persistent
&&
3347 !super_types
[mddev
->major_version
]
3348 .allow_new_offset(rdev
, new_offset
))
3350 rdev
->new_data_offset
= new_offset
;
3351 if (new_offset
> rdev
->data_offset
)
3352 mddev
->reshape_backwards
= 1;
3353 else if (new_offset
< rdev
->data_offset
)
3354 mddev
->reshape_backwards
= 0;
3358 static struct rdev_sysfs_entry rdev_new_offset
=
3359 __ATTR(new_offset
, S_IRUGO
|S_IWUSR
, new_offset_show
, new_offset_store
);
3362 rdev_size_show(struct md_rdev
*rdev
, char *page
)
3364 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->sectors
/ 2);
3367 static int overlaps(sector_t s1
, sector_t l1
, sector_t s2
, sector_t l2
)
3369 /* check if two start/length pairs overlap */
3377 static int strict_blocks_to_sectors(const char *buf
, sector_t
*sectors
)
3379 unsigned long long blocks
;
3382 if (kstrtoull(buf
, 10, &blocks
) < 0)
3385 if (blocks
& 1ULL << (8 * sizeof(blocks
) - 1))
3386 return -EINVAL
; /* sector conversion overflow */
3389 if (new != blocks
* 2)
3390 return -EINVAL
; /* unsigned long long to sector_t overflow */
3397 rdev_size_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3399 struct mddev
*my_mddev
= rdev
->mddev
;
3400 sector_t oldsectors
= rdev
->sectors
;
3403 if (test_bit(Journal
, &rdev
->flags
))
3405 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
3407 if (rdev
->data_offset
!= rdev
->new_data_offset
)
3408 return -EINVAL
; /* too confusing */
3409 if (my_mddev
->pers
&& rdev
->raid_disk
>= 0) {
3410 if (my_mddev
->persistent
) {
3411 sectors
= super_types
[my_mddev
->major_version
].
3412 rdev_size_change(rdev
, sectors
);
3415 } else if (!sectors
)
3416 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) -
3418 if (!my_mddev
->pers
->resize
)
3419 /* Cannot change size for RAID0 or Linear etc */
3422 if (sectors
< my_mddev
->dev_sectors
)
3423 return -EINVAL
; /* component must fit device */
3425 rdev
->sectors
= sectors
;
3426 if (sectors
> oldsectors
&& my_mddev
->external
) {
3427 /* Need to check that all other rdevs with the same
3428 * ->bdev do not overlap. 'rcu' is sufficient to walk
3429 * the rdev lists safely.
3430 * This check does not provide a hard guarantee, it
3431 * just helps avoid dangerous mistakes.
3433 struct mddev
*mddev
;
3435 struct list_head
*tmp
;
3438 for_each_mddev(mddev
, tmp
) {
3439 struct md_rdev
*rdev2
;
3441 rdev_for_each(rdev2
, mddev
)
3442 if (rdev
->bdev
== rdev2
->bdev
&&
3444 overlaps(rdev
->data_offset
, rdev
->sectors
,
3457 /* Someone else could have slipped in a size
3458 * change here, but doing so is just silly.
3459 * We put oldsectors back because we *know* it is
3460 * safe, and trust userspace not to race with
3463 rdev
->sectors
= oldsectors
;
3470 static struct rdev_sysfs_entry rdev_size
=
3471 __ATTR(size
, S_IRUGO
|S_IWUSR
, rdev_size_show
, rdev_size_store
);
3473 static ssize_t
recovery_start_show(struct md_rdev
*rdev
, char *page
)
3475 unsigned long long recovery_start
= rdev
->recovery_offset
;
3477 if (test_bit(In_sync
, &rdev
->flags
) ||
3478 recovery_start
== MaxSector
)
3479 return sprintf(page
, "none\n");
3481 return sprintf(page
, "%llu\n", recovery_start
);
3484 static ssize_t
recovery_start_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3486 unsigned long long recovery_start
;
3488 if (cmd_match(buf
, "none"))
3489 recovery_start
= MaxSector
;
3490 else if (kstrtoull(buf
, 10, &recovery_start
))
3493 if (rdev
->mddev
->pers
&&
3494 rdev
->raid_disk
>= 0)
3497 rdev
->recovery_offset
= recovery_start
;
3498 if (recovery_start
== MaxSector
)
3499 set_bit(In_sync
, &rdev
->flags
);
3501 clear_bit(In_sync
, &rdev
->flags
);
3505 static struct rdev_sysfs_entry rdev_recovery_start
=
3506 __ATTR(recovery_start
, S_IRUGO
|S_IWUSR
, recovery_start_show
, recovery_start_store
);
3508 /* sysfs access to bad-blocks list.
3509 * We present two files.
3510 * 'bad-blocks' lists sector numbers and lengths of ranges that
3511 * are recorded as bad. The list is truncated to fit within
3512 * the one-page limit of sysfs.
3513 * Writing "sector length" to this file adds an acknowledged
3515 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
3516 * been acknowledged. Writing to this file adds bad blocks
3517 * without acknowledging them. This is largely for testing.
3519 static ssize_t
bb_show(struct md_rdev
*rdev
, char *page
)
3521 return badblocks_show(&rdev
->badblocks
, page
, 0);
3523 static ssize_t
bb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
3525 int rv
= badblocks_store(&rdev
->badblocks
, page
, len
, 0);
3526 /* Maybe that ack was all we needed */
3527 if (test_and_clear_bit(BlockedBadBlocks
, &rdev
->flags
))
3528 wake_up(&rdev
->blocked_wait
);
3531 static struct rdev_sysfs_entry rdev_bad_blocks
=
3532 __ATTR(bad_blocks
, S_IRUGO
|S_IWUSR
, bb_show
, bb_store
);
3534 static ssize_t
ubb_show(struct md_rdev
*rdev
, char *page
)
3536 return badblocks_show(&rdev
->badblocks
, page
, 1);
3538 static ssize_t
ubb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
3540 return badblocks_store(&rdev
->badblocks
, page
, len
, 1);
3542 static struct rdev_sysfs_entry rdev_unack_bad_blocks
=
3543 __ATTR(unacknowledged_bad_blocks
, S_IRUGO
|S_IWUSR
, ubb_show
, ubb_store
);
3546 ppl_sector_show(struct md_rdev
*rdev
, char *page
)
3548 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->ppl
.sector
);
3552 ppl_sector_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3554 unsigned long long sector
;
3556 if (kstrtoull(buf
, 10, §or
) < 0)
3558 if (sector
!= (sector_t
)sector
)
3561 if (rdev
->mddev
->pers
&& test_bit(MD_HAS_PPL
, &rdev
->mddev
->flags
) &&
3562 rdev
->raid_disk
>= 0)
3565 if (rdev
->mddev
->persistent
) {
3566 if (rdev
->mddev
->major_version
== 0)
3568 if ((sector
> rdev
->sb_start
&&
3569 sector
- rdev
->sb_start
> S16_MAX
) ||
3570 (sector
< rdev
->sb_start
&&
3571 rdev
->sb_start
- sector
> -S16_MIN
))
3573 rdev
->ppl
.offset
= sector
- rdev
->sb_start
;
3574 } else if (!rdev
->mddev
->external
) {
3577 rdev
->ppl
.sector
= sector
;
3581 static struct rdev_sysfs_entry rdev_ppl_sector
=
3582 __ATTR(ppl_sector
, S_IRUGO
|S_IWUSR
, ppl_sector_show
, ppl_sector_store
);
3585 ppl_size_show(struct md_rdev
*rdev
, char *page
)
3587 return sprintf(page
, "%u\n", rdev
->ppl
.size
);
3591 ppl_size_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3595 if (kstrtouint(buf
, 10, &size
) < 0)
3598 if (rdev
->mddev
->pers
&& test_bit(MD_HAS_PPL
, &rdev
->mddev
->flags
) &&
3599 rdev
->raid_disk
>= 0)
3602 if (rdev
->mddev
->persistent
) {
3603 if (rdev
->mddev
->major_version
== 0)
3607 } else if (!rdev
->mddev
->external
) {
3610 rdev
->ppl
.size
= size
;
3614 static struct rdev_sysfs_entry rdev_ppl_size
=
3615 __ATTR(ppl_size
, S_IRUGO
|S_IWUSR
, ppl_size_show
, ppl_size_store
);
3617 static struct attribute
*rdev_default_attrs
[] = {
3622 &rdev_new_offset
.attr
,
3624 &rdev_recovery_start
.attr
,
3625 &rdev_bad_blocks
.attr
,
3626 &rdev_unack_bad_blocks
.attr
,
3627 &rdev_ppl_sector
.attr
,
3628 &rdev_ppl_size
.attr
,
3632 rdev_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
3634 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
3635 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
3641 return entry
->show(rdev
, page
);
3645 rdev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
3646 const char *page
, size_t length
)
3648 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
3649 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
3651 struct mddev
*mddev
= rdev
->mddev
;
3655 if (!capable(CAP_SYS_ADMIN
))
3657 rv
= mddev
? mddev_lock(mddev
) : -ENODEV
;
3659 if (rdev
->mddev
== NULL
)
3662 rv
= entry
->store(rdev
, page
, length
);
3663 mddev_unlock(mddev
);
3668 static void rdev_free(struct kobject
*ko
)
3670 struct md_rdev
*rdev
= container_of(ko
, struct md_rdev
, kobj
);
3673 static const struct sysfs_ops rdev_sysfs_ops
= {
3674 .show
= rdev_attr_show
,
3675 .store
= rdev_attr_store
,
3677 static struct kobj_type rdev_ktype
= {
3678 .release
= rdev_free
,
3679 .sysfs_ops
= &rdev_sysfs_ops
,
3680 .default_attrs
= rdev_default_attrs
,
3683 int md_rdev_init(struct md_rdev
*rdev
)
3686 rdev
->saved_raid_disk
= -1;
3687 rdev
->raid_disk
= -1;
3689 rdev
->data_offset
= 0;
3690 rdev
->new_data_offset
= 0;
3691 rdev
->sb_events
= 0;
3692 rdev
->last_read_error
= 0;
3693 rdev
->sb_loaded
= 0;
3694 rdev
->bb_page
= NULL
;
3695 atomic_set(&rdev
->nr_pending
, 0);
3696 atomic_set(&rdev
->read_errors
, 0);
3697 atomic_set(&rdev
->corrected_errors
, 0);
3699 INIT_LIST_HEAD(&rdev
->same_set
);
3700 init_waitqueue_head(&rdev
->blocked_wait
);
3702 /* Add space to store bad block list.
3703 * This reserves the space even on arrays where it cannot
3704 * be used - I wonder if that matters
3706 return badblocks_init(&rdev
->badblocks
, 0);
3708 EXPORT_SYMBOL_GPL(md_rdev_init
);
3710 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3712 * mark the device faulty if:
3714 * - the device is nonexistent (zero size)
3715 * - the device has no valid superblock
3717 * a faulty rdev _never_ has rdev->sb set.
3719 static struct md_rdev
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
3721 char b
[BDEVNAME_SIZE
];
3723 struct md_rdev
*rdev
;
3726 rdev
= kzalloc(sizeof(*rdev
), GFP_KERNEL
);
3728 return ERR_PTR(-ENOMEM
);
3730 err
= md_rdev_init(rdev
);
3733 err
= alloc_disk_sb(rdev
);
3737 err
= lock_rdev(rdev
, newdev
, super_format
== -2);
3741 kobject_init(&rdev
->kobj
, &rdev_ktype
);
3743 size
= i_size_read(rdev
->bdev
->bd_inode
) >> BLOCK_SIZE_BITS
;
3745 pr_warn("md: %s has zero or unknown size, marking faulty!\n",
3746 bdevname(rdev
->bdev
,b
));
3751 if (super_format
>= 0) {
3752 err
= super_types
[super_format
].
3753 load_super(rdev
, NULL
, super_minor
);
3754 if (err
== -EINVAL
) {
3755 pr_warn("md: %s does not have a valid v%d.%d superblock, not importing!\n",
3756 bdevname(rdev
->bdev
,b
),
3757 super_format
, super_minor
);
3761 pr_warn("md: could not read %s's sb, not importing!\n",
3762 bdevname(rdev
->bdev
,b
));
3772 md_rdev_clear(rdev
);
3774 return ERR_PTR(err
);
3778 * Check a full RAID array for plausibility
3781 static int analyze_sbs(struct mddev
*mddev
)
3784 struct md_rdev
*rdev
, *freshest
, *tmp
;
3785 char b
[BDEVNAME_SIZE
];
3788 rdev_for_each_safe(rdev
, tmp
, mddev
)
3789 switch (super_types
[mddev
->major_version
].
3790 load_super(rdev
, freshest
, mddev
->minor_version
)) {
3797 pr_warn("md: fatal superblock inconsistency in %s -- removing from array\n",
3798 bdevname(rdev
->bdev
,b
));
3799 md_kick_rdev_from_array(rdev
);
3802 /* Cannot find a valid fresh disk */
3804 pr_warn("md: cannot find a valid disk\n");
3808 super_types
[mddev
->major_version
].
3809 validate_super(mddev
, freshest
);
3812 rdev_for_each_safe(rdev
, tmp
, mddev
) {
3813 if (mddev
->max_disks
&&
3814 (rdev
->desc_nr
>= mddev
->max_disks
||
3815 i
> mddev
->max_disks
)) {
3816 pr_warn("md: %s: %s: only %d devices permitted\n",
3817 mdname(mddev
), bdevname(rdev
->bdev
, b
),
3819 md_kick_rdev_from_array(rdev
);
3822 if (rdev
!= freshest
) {
3823 if (super_types
[mddev
->major_version
].
3824 validate_super(mddev
, rdev
)) {
3825 pr_warn("md: kicking non-fresh %s from array!\n",
3826 bdevname(rdev
->bdev
,b
));
3827 md_kick_rdev_from_array(rdev
);
3831 if (mddev
->level
== LEVEL_MULTIPATH
) {
3832 rdev
->desc_nr
= i
++;
3833 rdev
->raid_disk
= rdev
->desc_nr
;
3834 set_bit(In_sync
, &rdev
->flags
);
3835 } else if (rdev
->raid_disk
>=
3836 (mddev
->raid_disks
- min(0, mddev
->delta_disks
)) &&
3837 !test_bit(Journal
, &rdev
->flags
)) {
3838 rdev
->raid_disk
= -1;
3839 clear_bit(In_sync
, &rdev
->flags
);
3846 /* Read a fixed-point number.
3847 * Numbers in sysfs attributes should be in "standard" units where
3848 * possible, so time should be in seconds.
3849 * However we internally use a a much smaller unit such as
3850 * milliseconds or jiffies.
3851 * This function takes a decimal number with a possible fractional
3852 * component, and produces an integer which is the result of
3853 * multiplying that number by 10^'scale'.
3854 * all without any floating-point arithmetic.
3856 int strict_strtoul_scaled(const char *cp
, unsigned long *res
, int scale
)
3858 unsigned long result
= 0;
3860 while (isdigit(*cp
) || (*cp
== '.' && decimals
< 0)) {
3863 else if (decimals
< scale
) {
3866 result
= result
* 10 + value
;
3878 *res
= result
* int_pow(10, scale
- decimals
);
3883 safe_delay_show(struct mddev
*mddev
, char *page
)
3885 int msec
= (mddev
->safemode_delay
*1000)/HZ
;
3886 return sprintf(page
, "%d.%03d\n", msec
/1000, msec
%1000);
3889 safe_delay_store(struct mddev
*mddev
, const char *cbuf
, size_t len
)
3893 if (mddev_is_clustered(mddev
)) {
3894 pr_warn("md: Safemode is disabled for clustered mode\n");
3898 if (strict_strtoul_scaled(cbuf
, &msec
, 3) < 0)
3901 mddev
->safemode_delay
= 0;
3903 unsigned long old_delay
= mddev
->safemode_delay
;
3904 unsigned long new_delay
= (msec
*HZ
)/1000;
3908 mddev
->safemode_delay
= new_delay
;
3909 if (new_delay
< old_delay
|| old_delay
== 0)
3910 mod_timer(&mddev
->safemode_timer
, jiffies
+1);
3914 static struct md_sysfs_entry md_safe_delay
=
3915 __ATTR(safe_mode_delay
, S_IRUGO
|S_IWUSR
,safe_delay_show
, safe_delay_store
);
3918 level_show(struct mddev
*mddev
, char *page
)
3920 struct md_personality
*p
;
3922 spin_lock(&mddev
->lock
);
3925 ret
= sprintf(page
, "%s\n", p
->name
);
3926 else if (mddev
->clevel
[0])
3927 ret
= sprintf(page
, "%s\n", mddev
->clevel
);
3928 else if (mddev
->level
!= LEVEL_NONE
)
3929 ret
= sprintf(page
, "%d\n", mddev
->level
);
3932 spin_unlock(&mddev
->lock
);
3937 level_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3942 struct md_personality
*pers
, *oldpers
;
3944 void *priv
, *oldpriv
;
3945 struct md_rdev
*rdev
;
3947 if (slen
== 0 || slen
>= sizeof(clevel
))
3950 rv
= mddev_lock(mddev
);
3954 if (mddev
->pers
== NULL
) {
3955 strncpy(mddev
->clevel
, buf
, slen
);
3956 if (mddev
->clevel
[slen
-1] == '\n')
3958 mddev
->clevel
[slen
] = 0;
3959 mddev
->level
= LEVEL_NONE
;
3967 /* request to change the personality. Need to ensure:
3968 * - array is not engaged in resync/recovery/reshape
3969 * - old personality can be suspended
3970 * - new personality will access other array.
3974 if (mddev
->sync_thread
||
3975 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
3976 mddev
->reshape_position
!= MaxSector
||
3977 mddev
->sysfs_active
)
3981 if (!mddev
->pers
->quiesce
) {
3982 pr_warn("md: %s: %s does not support online personality change\n",
3983 mdname(mddev
), mddev
->pers
->name
);
3987 /* Now find the new personality */
3988 strncpy(clevel
, buf
, slen
);
3989 if (clevel
[slen
-1] == '\n')
3992 if (kstrtol(clevel
, 10, &level
))
3995 if (request_module("md-%s", clevel
) != 0)
3996 request_module("md-level-%s", clevel
);
3997 spin_lock(&pers_lock
);
3998 pers
= find_pers(level
, clevel
);
3999 if (!pers
|| !try_module_get(pers
->owner
)) {
4000 spin_unlock(&pers_lock
);
4001 pr_warn("md: personality %s not loaded\n", clevel
);
4005 spin_unlock(&pers_lock
);
4007 if (pers
== mddev
->pers
) {
4008 /* Nothing to do! */
4009 module_put(pers
->owner
);
4013 if (!pers
->takeover
) {
4014 module_put(pers
->owner
);
4015 pr_warn("md: %s: %s does not support personality takeover\n",
4016 mdname(mddev
), clevel
);
4021 rdev_for_each(rdev
, mddev
)
4022 rdev
->new_raid_disk
= rdev
->raid_disk
;
4024 /* ->takeover must set new_* and/or delta_disks
4025 * if it succeeds, and may set them when it fails.
4027 priv
= pers
->takeover(mddev
);
4029 mddev
->new_level
= mddev
->level
;
4030 mddev
->new_layout
= mddev
->layout
;
4031 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
4032 mddev
->raid_disks
-= mddev
->delta_disks
;
4033 mddev
->delta_disks
= 0;
4034 mddev
->reshape_backwards
= 0;
4035 module_put(pers
->owner
);
4036 pr_warn("md: %s: %s would not accept array\n",
4037 mdname(mddev
), clevel
);
4042 /* Looks like we have a winner */
4043 mddev_suspend(mddev
);
4044 mddev_detach(mddev
);
4046 spin_lock(&mddev
->lock
);
4047 oldpers
= mddev
->pers
;
4048 oldpriv
= mddev
->private;
4050 mddev
->private = priv
;
4051 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
4052 mddev
->level
= mddev
->new_level
;
4053 mddev
->layout
= mddev
->new_layout
;
4054 mddev
->chunk_sectors
= mddev
->new_chunk_sectors
;
4055 mddev
->delta_disks
= 0;
4056 mddev
->reshape_backwards
= 0;
4057 mddev
->degraded
= 0;
4058 spin_unlock(&mddev
->lock
);
4060 if (oldpers
->sync_request
== NULL
&&
4062 /* We are converting from a no-redundancy array
4063 * to a redundancy array and metadata is managed
4064 * externally so we need to be sure that writes
4065 * won't block due to a need to transition
4067 * until external management is started.
4070 mddev
->safemode_delay
= 0;
4071 mddev
->safemode
= 0;
4074 oldpers
->free(mddev
, oldpriv
);
4076 if (oldpers
->sync_request
== NULL
&&
4077 pers
->sync_request
!= NULL
) {
4078 /* need to add the md_redundancy_group */
4079 if (sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
4080 pr_warn("md: cannot register extra attributes for %s\n",
4082 mddev
->sysfs_action
= sysfs_get_dirent(mddev
->kobj
.sd
, "sync_action");
4083 mddev
->sysfs_completed
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "sync_completed");
4084 mddev
->sysfs_degraded
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "degraded");
4086 if (oldpers
->sync_request
!= NULL
&&
4087 pers
->sync_request
== NULL
) {
4088 /* need to remove the md_redundancy_group */
4089 if (mddev
->to_remove
== NULL
)
4090 mddev
->to_remove
= &md_redundancy_group
;
4093 module_put(oldpers
->owner
);
4095 rdev_for_each(rdev
, mddev
) {
4096 if (rdev
->raid_disk
< 0)
4098 if (rdev
->new_raid_disk
>= mddev
->raid_disks
)
4099 rdev
->new_raid_disk
= -1;
4100 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
4102 sysfs_unlink_rdev(mddev
, rdev
);
4104 rdev_for_each(rdev
, mddev
) {
4105 if (rdev
->raid_disk
< 0)
4107 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
4109 rdev
->raid_disk
= rdev
->new_raid_disk
;
4110 if (rdev
->raid_disk
< 0)
4111 clear_bit(In_sync
, &rdev
->flags
);
4113 if (sysfs_link_rdev(mddev
, rdev
))
4114 pr_warn("md: cannot register rd%d for %s after level change\n",
4115 rdev
->raid_disk
, mdname(mddev
));
4119 if (pers
->sync_request
== NULL
) {
4120 /* this is now an array without redundancy, so
4121 * it must always be in_sync
4124 del_timer_sync(&mddev
->safemode_timer
);
4126 blk_set_stacking_limits(&mddev
->queue
->limits
);
4128 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
4129 mddev_resume(mddev
);
4131 md_update_sb(mddev
, 1);
4132 sysfs_notify_dirent_safe(mddev
->sysfs_level
);
4133 md_new_event(mddev
);
4136 mddev_unlock(mddev
);
4140 static struct md_sysfs_entry md_level
=
4141 __ATTR(level
, S_IRUGO
|S_IWUSR
, level_show
, level_store
);
4144 layout_show(struct mddev
*mddev
, char *page
)
4146 /* just a number, not meaningful for all levels */
4147 if (mddev
->reshape_position
!= MaxSector
&&
4148 mddev
->layout
!= mddev
->new_layout
)
4149 return sprintf(page
, "%d (%d)\n",
4150 mddev
->new_layout
, mddev
->layout
);
4151 return sprintf(page
, "%d\n", mddev
->layout
);
4155 layout_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4160 err
= kstrtouint(buf
, 10, &n
);
4163 err
= mddev_lock(mddev
);
4168 if (mddev
->pers
->check_reshape
== NULL
)
4173 mddev
->new_layout
= n
;
4174 err
= mddev
->pers
->check_reshape(mddev
);
4176 mddev
->new_layout
= mddev
->layout
;
4179 mddev
->new_layout
= n
;
4180 if (mddev
->reshape_position
== MaxSector
)
4183 mddev_unlock(mddev
);
4186 static struct md_sysfs_entry md_layout
=
4187 __ATTR(layout
, S_IRUGO
|S_IWUSR
, layout_show
, layout_store
);
4190 raid_disks_show(struct mddev
*mddev
, char *page
)
4192 if (mddev
->raid_disks
== 0)
4194 if (mddev
->reshape_position
!= MaxSector
&&
4195 mddev
->delta_disks
!= 0)
4196 return sprintf(page
, "%d (%d)\n", mddev
->raid_disks
,
4197 mddev
->raid_disks
- mddev
->delta_disks
);
4198 return sprintf(page
, "%d\n", mddev
->raid_disks
);
4201 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
);
4204 raid_disks_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4209 err
= kstrtouint(buf
, 10, &n
);
4213 err
= mddev_lock(mddev
);
4217 err
= update_raid_disks(mddev
, n
);
4218 else if (mddev
->reshape_position
!= MaxSector
) {
4219 struct md_rdev
*rdev
;
4220 int olddisks
= mddev
->raid_disks
- mddev
->delta_disks
;
4223 rdev_for_each(rdev
, mddev
) {
4225 rdev
->data_offset
< rdev
->new_data_offset
)
4228 rdev
->data_offset
> rdev
->new_data_offset
)
4232 mddev
->delta_disks
= n
- olddisks
;
4233 mddev
->raid_disks
= n
;
4234 mddev
->reshape_backwards
= (mddev
->delta_disks
< 0);
4236 mddev
->raid_disks
= n
;
4238 mddev_unlock(mddev
);
4239 return err
? err
: len
;
4241 static struct md_sysfs_entry md_raid_disks
=
4242 __ATTR(raid_disks
, S_IRUGO
|S_IWUSR
, raid_disks_show
, raid_disks_store
);
4245 uuid_show(struct mddev
*mddev
, char *page
)
4247 return sprintf(page
, "%pU\n", mddev
->uuid
);
4249 static struct md_sysfs_entry md_uuid
=
4250 __ATTR(uuid
, S_IRUGO
, uuid_show
, NULL
);
4253 chunk_size_show(struct mddev
*mddev
, char *page
)
4255 if (mddev
->reshape_position
!= MaxSector
&&
4256 mddev
->chunk_sectors
!= mddev
->new_chunk_sectors
)
4257 return sprintf(page
, "%d (%d)\n",
4258 mddev
->new_chunk_sectors
<< 9,
4259 mddev
->chunk_sectors
<< 9);
4260 return sprintf(page
, "%d\n", mddev
->chunk_sectors
<< 9);
4264 chunk_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4269 err
= kstrtoul(buf
, 10, &n
);
4273 err
= mddev_lock(mddev
);
4277 if (mddev
->pers
->check_reshape
== NULL
)
4282 mddev
->new_chunk_sectors
= n
>> 9;
4283 err
= mddev
->pers
->check_reshape(mddev
);
4285 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
4288 mddev
->new_chunk_sectors
= n
>> 9;
4289 if (mddev
->reshape_position
== MaxSector
)
4290 mddev
->chunk_sectors
= n
>> 9;
4292 mddev_unlock(mddev
);
4295 static struct md_sysfs_entry md_chunk_size
=
4296 __ATTR(chunk_size
, S_IRUGO
|S_IWUSR
, chunk_size_show
, chunk_size_store
);
4299 resync_start_show(struct mddev
*mddev
, char *page
)
4301 if (mddev
->recovery_cp
== MaxSector
)
4302 return sprintf(page
, "none\n");
4303 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->recovery_cp
);
4307 resync_start_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4309 unsigned long long n
;
4312 if (cmd_match(buf
, "none"))
4315 err
= kstrtoull(buf
, 10, &n
);
4318 if (n
!= (sector_t
)n
)
4322 err
= mddev_lock(mddev
);
4325 if (mddev
->pers
&& !test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
4329 mddev
->recovery_cp
= n
;
4331 set_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
4333 mddev_unlock(mddev
);
4336 static struct md_sysfs_entry md_resync_start
=
4337 __ATTR_PREALLOC(resync_start
, S_IRUGO
|S_IWUSR
,
4338 resync_start_show
, resync_start_store
);
4341 * The array state can be:
4344 * No devices, no size, no level
4345 * Equivalent to STOP_ARRAY ioctl
4347 * May have some settings, but array is not active
4348 * all IO results in error
4349 * When written, doesn't tear down array, but just stops it
4350 * suspended (not supported yet)
4351 * All IO requests will block. The array can be reconfigured.
4352 * Writing this, if accepted, will block until array is quiescent
4354 * no resync can happen. no superblocks get written.
4355 * write requests fail
4357 * like readonly, but behaves like 'clean' on a write request.
4359 * clean - no pending writes, but otherwise active.
4360 * When written to inactive array, starts without resync
4361 * If a write request arrives then
4362 * if metadata is known, mark 'dirty' and switch to 'active'.
4363 * if not known, block and switch to write-pending
4364 * If written to an active array that has pending writes, then fails.
4366 * fully active: IO and resync can be happening.
4367 * When written to inactive array, starts with resync
4370 * clean, but writes are blocked waiting for 'active' to be written.
4373 * like active, but no writes have been seen for a while (100msec).
4376 * RAID0/LINEAR-only: same as clean, but array is missing a member.
4377 * It's useful because RAID0/LINEAR mounted-arrays aren't stopped
4378 * when a member is gone, so this state will at least alert the
4379 * user that something is wrong.
4381 enum array_state
{ clear
, inactive
, suspended
, readonly
, read_auto
, clean
, active
,
4382 write_pending
, active_idle
, broken
, bad_word
};
4383 static char *array_states
[] = {
4384 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
4385 "write-pending", "active-idle", "broken", NULL
};
4387 static int match_word(const char *word
, char **list
)
4390 for (n
=0; list
[n
]; n
++)
4391 if (cmd_match(word
, list
[n
]))
4397 array_state_show(struct mddev
*mddev
, char *page
)
4399 enum array_state st
= inactive
;
4401 if (mddev
->pers
&& !test_bit(MD_NOT_READY
, &mddev
->flags
)) {
4410 spin_lock(&mddev
->lock
);
4411 if (test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
))
4413 else if (mddev
->in_sync
)
4415 else if (mddev
->safemode
)
4419 spin_unlock(&mddev
->lock
);
4422 if (test_bit(MD_BROKEN
, &mddev
->flags
) && st
== clean
)
4425 if (list_empty(&mddev
->disks
) &&
4426 mddev
->raid_disks
== 0 &&
4427 mddev
->dev_sectors
== 0)
4432 return sprintf(page
, "%s\n", array_states
[st
]);
4435 static int do_md_stop(struct mddev
*mddev
, int ro
, struct block_device
*bdev
);
4436 static int md_set_readonly(struct mddev
*mddev
, struct block_device
*bdev
);
4437 static int restart_array(struct mddev
*mddev
);
4440 array_state_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4443 enum array_state st
= match_word(buf
, array_states
);
4445 if (mddev
->pers
&& (st
== active
|| st
== clean
) && mddev
->ro
!= 1) {
4446 /* don't take reconfig_mutex when toggling between
4449 spin_lock(&mddev
->lock
);
4451 restart_array(mddev
);
4452 clear_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
4453 md_wakeup_thread(mddev
->thread
);
4454 wake_up(&mddev
->sb_wait
);
4455 } else /* st == clean */ {
4456 restart_array(mddev
);
4457 if (!set_in_sync(mddev
))
4461 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4462 spin_unlock(&mddev
->lock
);
4465 err
= mddev_lock(mddev
);
4473 /* stopping an active array */
4474 err
= do_md_stop(mddev
, 0, NULL
);
4477 /* stopping an active array */
4479 err
= do_md_stop(mddev
, 2, NULL
);
4481 err
= 0; /* already inactive */
4484 break; /* not supported yet */
4487 err
= md_set_readonly(mddev
, NULL
);
4490 set_disk_ro(mddev
->gendisk
, 1);
4491 err
= do_md_run(mddev
);
4497 err
= md_set_readonly(mddev
, NULL
);
4498 else if (mddev
->ro
== 1)
4499 err
= restart_array(mddev
);
4502 set_disk_ro(mddev
->gendisk
, 0);
4506 err
= do_md_run(mddev
);
4511 err
= restart_array(mddev
);
4514 spin_lock(&mddev
->lock
);
4515 if (!set_in_sync(mddev
))
4517 spin_unlock(&mddev
->lock
);
4523 err
= restart_array(mddev
);
4526 clear_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
4527 wake_up(&mddev
->sb_wait
);
4531 set_disk_ro(mddev
->gendisk
, 0);
4532 err
= do_md_run(mddev
);
4538 /* these cannot be set */
4543 if (mddev
->hold_active
== UNTIL_IOCTL
)
4544 mddev
->hold_active
= 0;
4545 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4547 mddev_unlock(mddev
);
4550 static struct md_sysfs_entry md_array_state
=
4551 __ATTR_PREALLOC(array_state
, S_IRUGO
|S_IWUSR
, array_state_show
, array_state_store
);
4554 max_corrected_read_errors_show(struct mddev
*mddev
, char *page
) {
4555 return sprintf(page
, "%d\n",
4556 atomic_read(&mddev
->max_corr_read_errors
));
4560 max_corrected_read_errors_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4565 rv
= kstrtouint(buf
, 10, &n
);
4568 atomic_set(&mddev
->max_corr_read_errors
, n
);
4572 static struct md_sysfs_entry max_corr_read_errors
=
4573 __ATTR(max_read_errors
, S_IRUGO
|S_IWUSR
, max_corrected_read_errors_show
,
4574 max_corrected_read_errors_store
);
4577 null_show(struct mddev
*mddev
, char *page
)
4582 /* need to ensure rdev_delayed_delete() has completed */
4583 static void flush_rdev_wq(struct mddev
*mddev
)
4585 struct md_rdev
*rdev
;
4588 rdev_for_each_rcu(rdev
, mddev
)
4589 if (work_pending(&rdev
->del_work
)) {
4590 flush_workqueue(md_rdev_misc_wq
);
4597 new_dev_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4599 /* buf must be %d:%d\n? giving major and minor numbers */
4600 /* The new device is added to the array.
4601 * If the array has a persistent superblock, we read the
4602 * superblock to initialise info and check validity.
4603 * Otherwise, only checking done is that in bind_rdev_to_array,
4604 * which mainly checks size.
4607 int major
= simple_strtoul(buf
, &e
, 10);
4610 struct md_rdev
*rdev
;
4613 if (!*buf
|| *e
!= ':' || !e
[1] || e
[1] == '\n')
4615 minor
= simple_strtoul(e
+1, &e
, 10);
4616 if (*e
&& *e
!= '\n')
4618 dev
= MKDEV(major
, minor
);
4619 if (major
!= MAJOR(dev
) ||
4620 minor
!= MINOR(dev
))
4623 flush_rdev_wq(mddev
);
4624 err
= mddev_lock(mddev
);
4627 if (mddev
->persistent
) {
4628 rdev
= md_import_device(dev
, mddev
->major_version
,
4629 mddev
->minor_version
);
4630 if (!IS_ERR(rdev
) && !list_empty(&mddev
->disks
)) {
4631 struct md_rdev
*rdev0
4632 = list_entry(mddev
->disks
.next
,
4633 struct md_rdev
, same_set
);
4634 err
= super_types
[mddev
->major_version
]
4635 .load_super(rdev
, rdev0
, mddev
->minor_version
);
4639 } else if (mddev
->external
)
4640 rdev
= md_import_device(dev
, -2, -1);
4642 rdev
= md_import_device(dev
, -1, -1);
4645 mddev_unlock(mddev
);
4646 return PTR_ERR(rdev
);
4648 err
= bind_rdev_to_array(rdev
, mddev
);
4652 mddev_unlock(mddev
);
4654 md_new_event(mddev
);
4655 return err
? err
: len
;
4658 static struct md_sysfs_entry md_new_device
=
4659 __ATTR(new_dev
, S_IWUSR
, null_show
, new_dev_store
);
4662 bitmap_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4665 unsigned long chunk
, end_chunk
;
4668 err
= mddev_lock(mddev
);
4673 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
4675 chunk
= end_chunk
= simple_strtoul(buf
, &end
, 0);
4676 if (buf
== end
) break;
4677 if (*end
== '-') { /* range */
4679 end_chunk
= simple_strtoul(buf
, &end
, 0);
4680 if (buf
== end
) break;
4682 if (*end
&& !isspace(*end
)) break;
4683 md_bitmap_dirty_bits(mddev
->bitmap
, chunk
, end_chunk
);
4684 buf
= skip_spaces(end
);
4686 md_bitmap_unplug(mddev
->bitmap
); /* flush the bits to disk */
4688 mddev_unlock(mddev
);
4692 static struct md_sysfs_entry md_bitmap
=
4693 __ATTR(bitmap_set_bits
, S_IWUSR
, null_show
, bitmap_store
);
4696 size_show(struct mddev
*mddev
, char *page
)
4698 return sprintf(page
, "%llu\n",
4699 (unsigned long long)mddev
->dev_sectors
/ 2);
4702 static int update_size(struct mddev
*mddev
, sector_t num_sectors
);
4705 size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4707 /* If array is inactive, we can reduce the component size, but
4708 * not increase it (except from 0).
4709 * If array is active, we can try an on-line resize
4712 int err
= strict_blocks_to_sectors(buf
, §ors
);
4716 err
= mddev_lock(mddev
);
4720 err
= update_size(mddev
, sectors
);
4722 md_update_sb(mddev
, 1);
4724 if (mddev
->dev_sectors
== 0 ||
4725 mddev
->dev_sectors
> sectors
)
4726 mddev
->dev_sectors
= sectors
;
4730 mddev_unlock(mddev
);
4731 return err
? err
: len
;
4734 static struct md_sysfs_entry md_size
=
4735 __ATTR(component_size
, S_IRUGO
|S_IWUSR
, size_show
, size_store
);
4737 /* Metadata version.
4739 * 'none' for arrays with no metadata (good luck...)
4740 * 'external' for arrays with externally managed metadata,
4741 * or N.M for internally known formats
4744 metadata_show(struct mddev
*mddev
, char *page
)
4746 if (mddev
->persistent
)
4747 return sprintf(page
, "%d.%d\n",
4748 mddev
->major_version
, mddev
->minor_version
);
4749 else if (mddev
->external
)
4750 return sprintf(page
, "external:%s\n", mddev
->metadata_type
);
4752 return sprintf(page
, "none\n");
4756 metadata_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4761 /* Changing the details of 'external' metadata is
4762 * always permitted. Otherwise there must be
4763 * no devices attached to the array.
4766 err
= mddev_lock(mddev
);
4770 if (mddev
->external
&& strncmp(buf
, "external:", 9) == 0)
4772 else if (!list_empty(&mddev
->disks
))
4776 if (cmd_match(buf
, "none")) {
4777 mddev
->persistent
= 0;
4778 mddev
->external
= 0;
4779 mddev
->major_version
= 0;
4780 mddev
->minor_version
= 90;
4783 if (strncmp(buf
, "external:", 9) == 0) {
4784 size_t namelen
= len
-9;
4785 if (namelen
>= sizeof(mddev
->metadata_type
))
4786 namelen
= sizeof(mddev
->metadata_type
)-1;
4787 strncpy(mddev
->metadata_type
, buf
+9, namelen
);
4788 mddev
->metadata_type
[namelen
] = 0;
4789 if (namelen
&& mddev
->metadata_type
[namelen
-1] == '\n')
4790 mddev
->metadata_type
[--namelen
] = 0;
4791 mddev
->persistent
= 0;
4792 mddev
->external
= 1;
4793 mddev
->major_version
= 0;
4794 mddev
->minor_version
= 90;
4797 major
= simple_strtoul(buf
, &e
, 10);
4799 if (e
==buf
|| *e
!= '.')
4802 minor
= simple_strtoul(buf
, &e
, 10);
4803 if (e
==buf
|| (*e
&& *e
!= '\n') )
4806 if (major
>= ARRAY_SIZE(super_types
) || super_types
[major
].name
== NULL
)
4808 mddev
->major_version
= major
;
4809 mddev
->minor_version
= minor
;
4810 mddev
->persistent
= 1;
4811 mddev
->external
= 0;
4814 mddev_unlock(mddev
);
4818 static struct md_sysfs_entry md_metadata
=
4819 __ATTR_PREALLOC(metadata_version
, S_IRUGO
|S_IWUSR
, metadata_show
, metadata_store
);
4822 action_show(struct mddev
*mddev
, char *page
)
4824 char *type
= "idle";
4825 unsigned long recovery
= mddev
->recovery
;
4826 if (test_bit(MD_RECOVERY_FROZEN
, &recovery
))
4828 else if (test_bit(MD_RECOVERY_RUNNING
, &recovery
) ||
4829 (!mddev
->ro
&& test_bit(MD_RECOVERY_NEEDED
, &recovery
))) {
4830 if (test_bit(MD_RECOVERY_RESHAPE
, &recovery
))
4832 else if (test_bit(MD_RECOVERY_SYNC
, &recovery
)) {
4833 if (!test_bit(MD_RECOVERY_REQUESTED
, &recovery
))
4835 else if (test_bit(MD_RECOVERY_CHECK
, &recovery
))
4839 } else if (test_bit(MD_RECOVERY_RECOVER
, &recovery
))
4841 else if (mddev
->reshape_position
!= MaxSector
)
4844 return sprintf(page
, "%s\n", type
);
4848 action_store(struct mddev
*mddev
, const char *page
, size_t len
)
4850 if (!mddev
->pers
|| !mddev
->pers
->sync_request
)
4854 if (cmd_match(page
, "idle") || cmd_match(page
, "frozen")) {
4855 if (cmd_match(page
, "frozen"))
4856 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4858 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4859 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
4860 mddev_lock(mddev
) == 0) {
4861 if (work_pending(&mddev
->del_work
))
4862 flush_workqueue(md_misc_wq
);
4863 if (mddev
->sync_thread
) {
4864 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4865 md_reap_sync_thread(mddev
);
4867 mddev_unlock(mddev
);
4869 } else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4871 else if (cmd_match(page
, "resync"))
4872 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4873 else if (cmd_match(page
, "recover")) {
4874 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4875 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
4876 } else if (cmd_match(page
, "reshape")) {
4878 if (mddev
->pers
->start_reshape
== NULL
)
4880 err
= mddev_lock(mddev
);
4882 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4885 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4886 err
= mddev
->pers
->start_reshape(mddev
);
4888 mddev_unlock(mddev
);
4892 sysfs_notify_dirent_safe(mddev
->sysfs_degraded
);
4894 if (cmd_match(page
, "check"))
4895 set_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
4896 else if (!cmd_match(page
, "repair"))
4898 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4899 set_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
4900 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
4902 if (mddev
->ro
== 2) {
4903 /* A write to sync_action is enough to justify
4904 * canceling read-auto mode
4907 md_wakeup_thread(mddev
->sync_thread
);
4909 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4910 md_wakeup_thread(mddev
->thread
);
4911 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
4915 static struct md_sysfs_entry md_scan_mode
=
4916 __ATTR_PREALLOC(sync_action
, S_IRUGO
|S_IWUSR
, action_show
, action_store
);
4919 last_sync_action_show(struct mddev
*mddev
, char *page
)
4921 return sprintf(page
, "%s\n", mddev
->last_sync_action
);
4924 static struct md_sysfs_entry md_last_scan_mode
= __ATTR_RO(last_sync_action
);
4927 mismatch_cnt_show(struct mddev
*mddev
, char *page
)
4929 return sprintf(page
, "%llu\n",
4930 (unsigned long long)
4931 atomic64_read(&mddev
->resync_mismatches
));
4934 static struct md_sysfs_entry md_mismatches
= __ATTR_RO(mismatch_cnt
);
4937 sync_min_show(struct mddev
*mddev
, char *page
)
4939 return sprintf(page
, "%d (%s)\n", speed_min(mddev
),
4940 mddev
->sync_speed_min
? "local": "system");
4944 sync_min_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4949 if (strncmp(buf
, "system", 6)==0) {
4952 rv
= kstrtouint(buf
, 10, &min
);
4958 mddev
->sync_speed_min
= min
;
4962 static struct md_sysfs_entry md_sync_min
=
4963 __ATTR(sync_speed_min
, S_IRUGO
|S_IWUSR
, sync_min_show
, sync_min_store
);
4966 sync_max_show(struct mddev
*mddev
, char *page
)
4968 return sprintf(page
, "%d (%s)\n", speed_max(mddev
),
4969 mddev
->sync_speed_max
? "local": "system");
4973 sync_max_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4978 if (strncmp(buf
, "system", 6)==0) {
4981 rv
= kstrtouint(buf
, 10, &max
);
4987 mddev
->sync_speed_max
= max
;
4991 static struct md_sysfs_entry md_sync_max
=
4992 __ATTR(sync_speed_max
, S_IRUGO
|S_IWUSR
, sync_max_show
, sync_max_store
);
4995 degraded_show(struct mddev
*mddev
, char *page
)
4997 return sprintf(page
, "%d\n", mddev
->degraded
);
4999 static struct md_sysfs_entry md_degraded
= __ATTR_RO(degraded
);
5002 sync_force_parallel_show(struct mddev
*mddev
, char *page
)
5004 return sprintf(page
, "%d\n", mddev
->parallel_resync
);
5008 sync_force_parallel_store(struct mddev
*mddev
, const char *buf
, size_t len
)
5012 if (kstrtol(buf
, 10, &n
))
5015 if (n
!= 0 && n
!= 1)
5018 mddev
->parallel_resync
= n
;
5020 if (mddev
->sync_thread
)
5021 wake_up(&resync_wait
);
5026 /* force parallel resync, even with shared block devices */
5027 static struct md_sysfs_entry md_sync_force_parallel
=
5028 __ATTR(sync_force_parallel
, S_IRUGO
|S_IWUSR
,
5029 sync_force_parallel_show
, sync_force_parallel_store
);
5032 sync_speed_show(struct mddev
*mddev
, char *page
)
5034 unsigned long resync
, dt
, db
;
5035 if (mddev
->curr_resync
== 0)
5036 return sprintf(page
, "none\n");
5037 resync
= mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
);
5038 dt
= (jiffies
- mddev
->resync_mark
) / HZ
;
5040 db
= resync
- mddev
->resync_mark_cnt
;
5041 return sprintf(page
, "%lu\n", db
/dt
/2); /* K/sec */
5044 static struct md_sysfs_entry md_sync_speed
= __ATTR_RO(sync_speed
);
5047 sync_completed_show(struct mddev
*mddev
, char *page
)
5049 unsigned long long max_sectors
, resync
;
5051 if (!test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
5052 return sprintf(page
, "none\n");
5054 if (mddev
->curr_resync
== 1 ||
5055 mddev
->curr_resync
== 2)
5056 return sprintf(page
, "delayed\n");
5058 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
5059 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
5060 max_sectors
= mddev
->resync_max_sectors
;
5062 max_sectors
= mddev
->dev_sectors
;
5064 resync
= mddev
->curr_resync_completed
;
5065 return sprintf(page
, "%llu / %llu\n", resync
, max_sectors
);
5068 static struct md_sysfs_entry md_sync_completed
=
5069 __ATTR_PREALLOC(sync_completed
, S_IRUGO
, sync_completed_show
, NULL
);
5072 min_sync_show(struct mddev
*mddev
, char *page
)
5074 return sprintf(page
, "%llu\n",
5075 (unsigned long long)mddev
->resync_min
);
5078 min_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
5080 unsigned long long min
;
5083 if (kstrtoull(buf
, 10, &min
))
5086 spin_lock(&mddev
->lock
);
5088 if (min
> mddev
->resync_max
)
5092 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
5095 /* Round down to multiple of 4K for safety */
5096 mddev
->resync_min
= round_down(min
, 8);
5100 spin_unlock(&mddev
->lock
);
5104 static struct md_sysfs_entry md_min_sync
=
5105 __ATTR(sync_min
, S_IRUGO
|S_IWUSR
, min_sync_show
, min_sync_store
);
5108 max_sync_show(struct mddev
*mddev
, char *page
)
5110 if (mddev
->resync_max
== MaxSector
)
5111 return sprintf(page
, "max\n");
5113 return sprintf(page
, "%llu\n",
5114 (unsigned long long)mddev
->resync_max
);
5117 max_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
5120 spin_lock(&mddev
->lock
);
5121 if (strncmp(buf
, "max", 3) == 0)
5122 mddev
->resync_max
= MaxSector
;
5124 unsigned long long max
;
5128 if (kstrtoull(buf
, 10, &max
))
5130 if (max
< mddev
->resync_min
)
5134 if (max
< mddev
->resync_max
&&
5136 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
5139 /* Must be a multiple of chunk_size */
5140 chunk
= mddev
->chunk_sectors
;
5142 sector_t temp
= max
;
5145 if (sector_div(temp
, chunk
))
5148 mddev
->resync_max
= max
;
5150 wake_up(&mddev
->recovery_wait
);
5153 spin_unlock(&mddev
->lock
);
5157 static struct md_sysfs_entry md_max_sync
=
5158 __ATTR(sync_max
, S_IRUGO
|S_IWUSR
, max_sync_show
, max_sync_store
);
5161 suspend_lo_show(struct mddev
*mddev
, char *page
)
5163 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_lo
);
5167 suspend_lo_store(struct mddev
*mddev
, const char *buf
, size_t len
)
5169 unsigned long long new;
5172 err
= kstrtoull(buf
, 10, &new);
5175 if (new != (sector_t
)new)
5178 err
= mddev_lock(mddev
);
5182 if (mddev
->pers
== NULL
||
5183 mddev
->pers
->quiesce
== NULL
)
5185 mddev_suspend(mddev
);
5186 mddev
->suspend_lo
= new;
5187 mddev_resume(mddev
);
5191 mddev_unlock(mddev
);
5194 static struct md_sysfs_entry md_suspend_lo
=
5195 __ATTR(suspend_lo
, S_IRUGO
|S_IWUSR
, suspend_lo_show
, suspend_lo_store
);
5198 suspend_hi_show(struct mddev
*mddev
, char *page
)
5200 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_hi
);
5204 suspend_hi_store(struct mddev
*mddev
, const char *buf
, size_t len
)
5206 unsigned long long new;
5209 err
= kstrtoull(buf
, 10, &new);
5212 if (new != (sector_t
)new)
5215 err
= mddev_lock(mddev
);
5219 if (mddev
->pers
== NULL
)
5222 mddev_suspend(mddev
);
5223 mddev
->suspend_hi
= new;
5224 mddev_resume(mddev
);
5228 mddev_unlock(mddev
);
5231 static struct md_sysfs_entry md_suspend_hi
=
5232 __ATTR(suspend_hi
, S_IRUGO
|S_IWUSR
, suspend_hi_show
, suspend_hi_store
);
5235 reshape_position_show(struct mddev
*mddev
, char *page
)
5237 if (mddev
->reshape_position
!= MaxSector
)
5238 return sprintf(page
, "%llu\n",
5239 (unsigned long long)mddev
->reshape_position
);
5240 strcpy(page
, "none\n");
5245 reshape_position_store(struct mddev
*mddev
, const char *buf
, size_t len
)
5247 struct md_rdev
*rdev
;
5248 unsigned long long new;
5251 err
= kstrtoull(buf
, 10, &new);
5254 if (new != (sector_t
)new)
5256 err
= mddev_lock(mddev
);
5262 mddev
->reshape_position
= new;
5263 mddev
->delta_disks
= 0;
5264 mddev
->reshape_backwards
= 0;
5265 mddev
->new_level
= mddev
->level
;
5266 mddev
->new_layout
= mddev
->layout
;
5267 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
5268 rdev_for_each(rdev
, mddev
)
5269 rdev
->new_data_offset
= rdev
->data_offset
;
5272 mddev_unlock(mddev
);
5276 static struct md_sysfs_entry md_reshape_position
=
5277 __ATTR(reshape_position
, S_IRUGO
|S_IWUSR
, reshape_position_show
,
5278 reshape_position_store
);
5281 reshape_direction_show(struct mddev
*mddev
, char *page
)
5283 return sprintf(page
, "%s\n",
5284 mddev
->reshape_backwards
? "backwards" : "forwards");
5288 reshape_direction_store(struct mddev
*mddev
, const char *buf
, size_t len
)
5293 if (cmd_match(buf
, "forwards"))
5295 else if (cmd_match(buf
, "backwards"))
5299 if (mddev
->reshape_backwards
== backwards
)
5302 err
= mddev_lock(mddev
);
5305 /* check if we are allowed to change */
5306 if (mddev
->delta_disks
)
5308 else if (mddev
->persistent
&&
5309 mddev
->major_version
== 0)
5312 mddev
->reshape_backwards
= backwards
;
5313 mddev_unlock(mddev
);
5317 static struct md_sysfs_entry md_reshape_direction
=
5318 __ATTR(reshape_direction
, S_IRUGO
|S_IWUSR
, reshape_direction_show
,
5319 reshape_direction_store
);
5322 array_size_show(struct mddev
*mddev
, char *page
)
5324 if (mddev
->external_size
)
5325 return sprintf(page
, "%llu\n",
5326 (unsigned long long)mddev
->array_sectors
/2);
5328 return sprintf(page
, "default\n");
5332 array_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
5337 err
= mddev_lock(mddev
);
5341 /* cluster raid doesn't support change array_sectors */
5342 if (mddev_is_clustered(mddev
)) {
5343 mddev_unlock(mddev
);
5347 if (strncmp(buf
, "default", 7) == 0) {
5349 sectors
= mddev
->pers
->size(mddev
, 0, 0);
5351 sectors
= mddev
->array_sectors
;
5353 mddev
->external_size
= 0;
5355 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
5357 else if (mddev
->pers
&& mddev
->pers
->size(mddev
, 0, 0) < sectors
)
5360 mddev
->external_size
= 1;
5364 mddev
->array_sectors
= sectors
;
5366 set_capacity_and_notify(mddev
->gendisk
,
5367 mddev
->array_sectors
);
5369 mddev_unlock(mddev
);
5373 static struct md_sysfs_entry md_array_size
=
5374 __ATTR(array_size
, S_IRUGO
|S_IWUSR
, array_size_show
,
5378 consistency_policy_show(struct mddev
*mddev
, char *page
)
5382 if (test_bit(MD_HAS_JOURNAL
, &mddev
->flags
)) {
5383 ret
= sprintf(page
, "journal\n");
5384 } else if (test_bit(MD_HAS_PPL
, &mddev
->flags
)) {
5385 ret
= sprintf(page
, "ppl\n");
5386 } else if (mddev
->bitmap
) {
5387 ret
= sprintf(page
, "bitmap\n");
5388 } else if (mddev
->pers
) {
5389 if (mddev
->pers
->sync_request
)
5390 ret
= sprintf(page
, "resync\n");
5392 ret
= sprintf(page
, "none\n");
5394 ret
= sprintf(page
, "unknown\n");
5401 consistency_policy_store(struct mddev
*mddev
, const char *buf
, size_t len
)
5406 if (mddev
->pers
->change_consistency_policy
)
5407 err
= mddev
->pers
->change_consistency_policy(mddev
, buf
);
5410 } else if (mddev
->external
&& strncmp(buf
, "ppl", 3) == 0) {
5411 set_bit(MD_HAS_PPL
, &mddev
->flags
);
5416 return err
? err
: len
;
5419 static struct md_sysfs_entry md_consistency_policy
=
5420 __ATTR(consistency_policy
, S_IRUGO
| S_IWUSR
, consistency_policy_show
,
5421 consistency_policy_store
);
5423 static ssize_t
fail_last_dev_show(struct mddev
*mddev
, char *page
)
5425 return sprintf(page
, "%d\n", mddev
->fail_last_dev
);
5429 * Setting fail_last_dev to true to allow last device to be forcibly removed
5430 * from RAID1/RAID10.
5433 fail_last_dev_store(struct mddev
*mddev
, const char *buf
, size_t len
)
5438 ret
= kstrtobool(buf
, &value
);
5442 if (value
!= mddev
->fail_last_dev
)
5443 mddev
->fail_last_dev
= value
;
5447 static struct md_sysfs_entry md_fail_last_dev
=
5448 __ATTR(fail_last_dev
, S_IRUGO
| S_IWUSR
, fail_last_dev_show
,
5449 fail_last_dev_store
);
5451 static ssize_t
serialize_policy_show(struct mddev
*mddev
, char *page
)
5453 if (mddev
->pers
== NULL
|| (mddev
->pers
->level
!= 1))
5454 return sprintf(page
, "n/a\n");
5456 return sprintf(page
, "%d\n", mddev
->serialize_policy
);
5460 * Setting serialize_policy to true to enforce write IO is not reordered
5464 serialize_policy_store(struct mddev
*mddev
, const char *buf
, size_t len
)
5469 err
= kstrtobool(buf
, &value
);
5473 if (value
== mddev
->serialize_policy
)
5476 err
= mddev_lock(mddev
);
5479 if (mddev
->pers
== NULL
|| (mddev
->pers
->level
!= 1)) {
5480 pr_err("md: serialize_policy is only effective for raid1\n");
5485 mddev_suspend(mddev
);
5487 mddev_create_serial_pool(mddev
, NULL
, true);
5489 mddev_destroy_serial_pool(mddev
, NULL
, true);
5490 mddev
->serialize_policy
= value
;
5491 mddev_resume(mddev
);
5493 mddev_unlock(mddev
);
5497 static struct md_sysfs_entry md_serialize_policy
=
5498 __ATTR(serialize_policy
, S_IRUGO
| S_IWUSR
, serialize_policy_show
,
5499 serialize_policy_store
);
5502 static struct attribute
*md_default_attrs
[] = {
5505 &md_raid_disks
.attr
,
5507 &md_chunk_size
.attr
,
5509 &md_resync_start
.attr
,
5511 &md_new_device
.attr
,
5512 &md_safe_delay
.attr
,
5513 &md_array_state
.attr
,
5514 &md_reshape_position
.attr
,
5515 &md_reshape_direction
.attr
,
5516 &md_array_size
.attr
,
5517 &max_corr_read_errors
.attr
,
5518 &md_consistency_policy
.attr
,
5519 &md_fail_last_dev
.attr
,
5520 &md_serialize_policy
.attr
,
5524 static struct attribute
*md_redundancy_attrs
[] = {
5526 &md_last_scan_mode
.attr
,
5527 &md_mismatches
.attr
,
5530 &md_sync_speed
.attr
,
5531 &md_sync_force_parallel
.attr
,
5532 &md_sync_completed
.attr
,
5535 &md_suspend_lo
.attr
,
5536 &md_suspend_hi
.attr
,
5541 static struct attribute_group md_redundancy_group
= {
5543 .attrs
= md_redundancy_attrs
,
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_free(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
);
5602 del_gendisk(mddev
->gendisk
);
5604 blk_cleanup_queue(mddev
->queue
);
5606 put_disk(mddev
->gendisk
);
5607 percpu_ref_exit(&mddev
->writes_pending
);
5609 bioset_exit(&mddev
->bio_set
);
5610 bioset_exit(&mddev
->sync_set
);
5611 mempool_exit(&mddev
->md_io_pool
);
5615 static const struct sysfs_ops md_sysfs_ops
= {
5616 .show
= md_attr_show
,
5617 .store
= md_attr_store
,
5619 static struct kobj_type md_ktype
= {
5621 .sysfs_ops
= &md_sysfs_ops
,
5622 .default_attrs
= md_default_attrs
,
5627 static void mddev_delayed_delete(struct work_struct
*ws
)
5629 struct mddev
*mddev
= container_of(ws
, struct mddev
, del_work
);
5631 sysfs_remove_group(&mddev
->kobj
, &md_bitmap_group
);
5632 kobject_del(&mddev
->kobj
);
5633 kobject_put(&mddev
->kobj
);
5636 static void no_op(struct percpu_ref
*r
) {}
5638 int mddev_init_writes_pending(struct mddev
*mddev
)
5640 if (mddev
->writes_pending
.percpu_count_ptr
)
5642 if (percpu_ref_init(&mddev
->writes_pending
, no_op
,
5643 PERCPU_REF_ALLOW_REINIT
, GFP_KERNEL
) < 0)
5645 /* We want to start with the refcount at zero */
5646 percpu_ref_put(&mddev
->writes_pending
);
5649 EXPORT_SYMBOL_GPL(mddev_init_writes_pending
);
5651 static int md_alloc(dev_t dev
, char *name
)
5654 * If dev is zero, name is the name of a device to allocate with
5655 * an arbitrary minor number. It will be "md_???"
5656 * If dev is non-zero it must be a device number with a MAJOR of
5657 * MD_MAJOR or mdp_major. In this case, if "name" is NULL, then
5658 * the device is being created by opening a node in /dev.
5659 * If "name" is not NULL, the device is being created by
5660 * writing to /sys/module/md_mod/parameters/new_array.
5662 static DEFINE_MUTEX(disks_mutex
);
5663 struct mddev
*mddev
;
5664 struct gendisk
*disk
;
5671 * Wait for any previous instance of this device to be completely
5672 * removed (mddev_delayed_delete).
5674 flush_workqueue(md_misc_wq
);
5676 mutex_lock(&disks_mutex
);
5677 mddev
= mddev_alloc(dev
);
5678 if (IS_ERR(mddev
)) {
5679 mutex_unlock(&disks_mutex
);
5680 return PTR_ERR(mddev
);
5683 partitioned
= (MAJOR(mddev
->unit
) != MD_MAJOR
);
5684 shift
= partitioned
? MdpMinorShift
: 0;
5685 unit
= MINOR(mddev
->unit
) >> shift
;
5688 /* Need to ensure that 'name' is not a duplicate.
5690 struct mddev
*mddev2
;
5691 spin_lock(&all_mddevs_lock
);
5693 list_for_each_entry(mddev2
, &all_mddevs
, all_mddevs
)
5694 if (mddev2
->gendisk
&&
5695 strcmp(mddev2
->gendisk
->disk_name
, name
) == 0) {
5696 spin_unlock(&all_mddevs_lock
);
5700 spin_unlock(&all_mddevs_lock
);
5704 * Creating /dev/mdNNN via "newarray", so adjust hold_active.
5706 mddev
->hold_active
= UNTIL_STOP
;
5708 error
= mempool_init_kmalloc_pool(&mddev
->md_io_pool
, BIO_POOL_SIZE
,
5709 sizeof(struct md_io
));
5714 mddev
->queue
= blk_alloc_queue(NUMA_NO_NODE
);
5718 blk_set_stacking_limits(&mddev
->queue
->limits
);
5720 disk
= alloc_disk(1 << shift
);
5722 blk_cleanup_queue(mddev
->queue
);
5723 mddev
->queue
= NULL
;
5726 disk
->major
= MAJOR(mddev
->unit
);
5727 disk
->first_minor
= unit
<< shift
;
5729 strcpy(disk
->disk_name
, name
);
5730 else if (partitioned
)
5731 sprintf(disk
->disk_name
, "md_d%d", unit
);
5733 sprintf(disk
->disk_name
, "md%d", unit
);
5734 disk
->fops
= &md_fops
;
5735 disk
->private_data
= mddev
;
5736 disk
->queue
= mddev
->queue
;
5737 blk_queue_write_cache(mddev
->queue
, true, true);
5738 /* Allow extended partitions. This makes the
5739 * 'mdp' device redundant, but we can't really
5742 disk
->flags
|= GENHD_FL_EXT_DEVT
;
5743 disk
->events
|= DISK_EVENT_MEDIA_CHANGE
;
5744 mddev
->gendisk
= disk
;
5745 /* As soon as we call add_disk(), another thread could get
5746 * through to md_open, so make sure it doesn't get too far
5748 mutex_lock(&mddev
->open_mutex
);
5751 error
= kobject_add(&mddev
->kobj
, &disk_to_dev(disk
)->kobj
, "%s", "md");
5753 /* This isn't possible, but as kobject_init_and_add is marked
5754 * __must_check, we must do something with the result
5756 pr_debug("md: cannot register %s/md - name in use\n",
5760 if (mddev
->kobj
.sd
&&
5761 sysfs_create_group(&mddev
->kobj
, &md_bitmap_group
))
5762 pr_debug("pointless warning\n");
5763 mutex_unlock(&mddev
->open_mutex
);
5765 mutex_unlock(&disks_mutex
);
5766 if (!error
&& mddev
->kobj
.sd
) {
5767 kobject_uevent(&mddev
->kobj
, KOBJ_ADD
);
5768 mddev
->sysfs_state
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "array_state");
5769 mddev
->sysfs_level
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "level");
5775 static void md_probe(dev_t dev
)
5777 if (MAJOR(dev
) == MD_MAJOR
&& MINOR(dev
) >= 512)
5780 md_alloc(dev
, NULL
);
5783 static int add_named_array(const char *val
, const struct kernel_param
*kp
)
5786 * val must be "md_*" or "mdNNN".
5787 * For "md_*" we allocate an array with a large free minor number, and
5788 * set the name to val. val must not already be an active name.
5789 * For "mdNNN" we allocate an array with the minor number NNN
5790 * which must not already be in use.
5792 int len
= strlen(val
);
5793 char buf
[DISK_NAME_LEN
];
5794 unsigned long devnum
;
5796 while (len
&& val
[len
-1] == '\n')
5798 if (len
>= DISK_NAME_LEN
)
5800 strlcpy(buf
, val
, len
+1);
5801 if (strncmp(buf
, "md_", 3) == 0)
5802 return md_alloc(0, buf
);
5803 if (strncmp(buf
, "md", 2) == 0 &&
5805 kstrtoul(buf
+2, 10, &devnum
) == 0 &&
5806 devnum
<= MINORMASK
)
5807 return md_alloc(MKDEV(MD_MAJOR
, devnum
), NULL
);
5812 static void md_safemode_timeout(struct timer_list
*t
)
5814 struct mddev
*mddev
= from_timer(mddev
, t
, safemode_timer
);
5816 mddev
->safemode
= 1;
5817 if (mddev
->external
)
5818 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5820 md_wakeup_thread(mddev
->thread
);
5823 static int start_dirty_degraded
;
5825 int md_run(struct mddev
*mddev
)
5828 struct md_rdev
*rdev
;
5829 struct md_personality
*pers
;
5831 if (list_empty(&mddev
->disks
))
5832 /* cannot run an array with no devices.. */
5837 /* Cannot run until previous stop completes properly */
5838 if (mddev
->sysfs_active
)
5842 * Analyze all RAID superblock(s)
5844 if (!mddev
->raid_disks
) {
5845 if (!mddev
->persistent
)
5847 err
= analyze_sbs(mddev
);
5852 if (mddev
->level
!= LEVEL_NONE
)
5853 request_module("md-level-%d", mddev
->level
);
5854 else if (mddev
->clevel
[0])
5855 request_module("md-%s", mddev
->clevel
);
5858 * Drop all container device buffers, from now on
5859 * the only valid external interface is through the md
5862 mddev
->has_superblocks
= false;
5863 rdev_for_each(rdev
, mddev
) {
5864 if (test_bit(Faulty
, &rdev
->flags
))
5866 sync_blockdev(rdev
->bdev
);
5867 invalidate_bdev(rdev
->bdev
);
5868 if (mddev
->ro
!= 1 && rdev_read_only(rdev
)) {
5871 set_disk_ro(mddev
->gendisk
, 1);
5875 mddev
->has_superblocks
= true;
5877 /* perform some consistency tests on the device.
5878 * We don't want the data to overlap the metadata,
5879 * Internal Bitmap issues have been handled elsewhere.
5881 if (rdev
->meta_bdev
) {
5882 /* Nothing to check */;
5883 } else if (rdev
->data_offset
< rdev
->sb_start
) {
5884 if (mddev
->dev_sectors
&&
5885 rdev
->data_offset
+ mddev
->dev_sectors
5887 pr_warn("md: %s: data overlaps metadata\n",
5892 if (rdev
->sb_start
+ rdev
->sb_size
/512
5893 > rdev
->data_offset
) {
5894 pr_warn("md: %s: metadata overlaps data\n",
5899 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
5902 if (!bioset_initialized(&mddev
->bio_set
)) {
5903 err
= bioset_init(&mddev
->bio_set
, BIO_POOL_SIZE
, 0, BIOSET_NEED_BVECS
);
5907 if (!bioset_initialized(&mddev
->sync_set
)) {
5908 err
= bioset_init(&mddev
->sync_set
, BIO_POOL_SIZE
, 0, BIOSET_NEED_BVECS
);
5913 spin_lock(&pers_lock
);
5914 pers
= find_pers(mddev
->level
, mddev
->clevel
);
5915 if (!pers
|| !try_module_get(pers
->owner
)) {
5916 spin_unlock(&pers_lock
);
5917 if (mddev
->level
!= LEVEL_NONE
)
5918 pr_warn("md: personality for level %d is not loaded!\n",
5921 pr_warn("md: personality for level %s is not loaded!\n",
5926 spin_unlock(&pers_lock
);
5927 if (mddev
->level
!= pers
->level
) {
5928 mddev
->level
= pers
->level
;
5929 mddev
->new_level
= pers
->level
;
5931 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
5933 if (mddev
->reshape_position
!= MaxSector
&&
5934 pers
->start_reshape
== NULL
) {
5935 /* This personality cannot handle reshaping... */
5936 module_put(pers
->owner
);
5941 if (pers
->sync_request
) {
5942 /* Warn if this is a potentially silly
5945 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
5946 struct md_rdev
*rdev2
;
5949 rdev_for_each(rdev
, mddev
)
5950 rdev_for_each(rdev2
, mddev
) {
5952 rdev
->bdev
->bd_disk
==
5953 rdev2
->bdev
->bd_disk
) {
5954 pr_warn("%s: WARNING: %s appears to be on the same physical disk as %s.\n",
5956 bdevname(rdev
->bdev
,b
),
5957 bdevname(rdev2
->bdev
,b2
));
5963 pr_warn("True protection against single-disk failure might be compromised.\n");
5966 mddev
->recovery
= 0;
5967 /* may be over-ridden by personality */
5968 mddev
->resync_max_sectors
= mddev
->dev_sectors
;
5970 mddev
->ok_start_degraded
= start_dirty_degraded
;
5972 if (start_readonly
&& mddev
->ro
== 0)
5973 mddev
->ro
= 2; /* read-only, but switch on first write */
5975 err
= pers
->run(mddev
);
5977 pr_warn("md: pers->run() failed ...\n");
5978 else if (pers
->size(mddev
, 0, 0) < mddev
->array_sectors
) {
5979 WARN_ONCE(!mddev
->external_size
,
5980 "%s: default size too small, but 'external_size' not in effect?\n",
5982 pr_warn("md: invalid array_size %llu > default size %llu\n",
5983 (unsigned long long)mddev
->array_sectors
/ 2,
5984 (unsigned long long)pers
->size(mddev
, 0, 0) / 2);
5987 if (err
== 0 && pers
->sync_request
&&
5988 (mddev
->bitmap_info
.file
|| mddev
->bitmap_info
.offset
)) {
5989 struct bitmap
*bitmap
;
5991 bitmap
= md_bitmap_create(mddev
, -1);
5992 if (IS_ERR(bitmap
)) {
5993 err
= PTR_ERR(bitmap
);
5994 pr_warn("%s: failed to create bitmap (%d)\n",
5995 mdname(mddev
), err
);
5997 mddev
->bitmap
= bitmap
;
6003 if (mddev
->bitmap_info
.max_write_behind
> 0) {
6004 bool create_pool
= false;
6006 rdev_for_each(rdev
, mddev
) {
6007 if (test_bit(WriteMostly
, &rdev
->flags
) &&
6008 rdev_init_serial(rdev
))
6011 if (create_pool
&& mddev
->serial_info_pool
== NULL
) {
6012 mddev
->serial_info_pool
=
6013 mempool_create_kmalloc_pool(NR_SERIAL_INFOS
,
6014 sizeof(struct serial_info
));
6015 if (!mddev
->serial_info_pool
) {
6025 rdev_for_each(rdev
, mddev
) {
6026 if (rdev
->raid_disk
>= 0 &&
6027 !blk_queue_nonrot(bdev_get_queue(rdev
->bdev
))) {
6032 if (mddev
->degraded
)
6035 blk_queue_flag_set(QUEUE_FLAG_NONROT
, mddev
->queue
);
6037 blk_queue_flag_clear(QUEUE_FLAG_NONROT
, mddev
->queue
);
6039 if (pers
->sync_request
) {
6040 if (mddev
->kobj
.sd
&&
6041 sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
6042 pr_warn("md: cannot register extra attributes for %s\n",
6044 mddev
->sysfs_action
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "sync_action");
6045 mddev
->sysfs_completed
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "sync_completed");
6046 mddev
->sysfs_degraded
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "degraded");
6047 } else if (mddev
->ro
== 2) /* auto-readonly not meaningful */
6050 atomic_set(&mddev
->max_corr_read_errors
,
6051 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS
);
6052 mddev
->safemode
= 0;
6053 if (mddev_is_clustered(mddev
))
6054 mddev
->safemode_delay
= 0;
6056 mddev
->safemode_delay
= DEFAULT_SAFEMODE_DELAY
;
6059 spin_lock(&mddev
->lock
);
6061 spin_unlock(&mddev
->lock
);
6062 rdev_for_each(rdev
, mddev
)
6063 if (rdev
->raid_disk
>= 0)
6064 sysfs_link_rdev(mddev
, rdev
); /* failure here is OK */
6066 if (mddev
->degraded
&& !mddev
->ro
)
6067 /* This ensures that recovering status is reported immediately
6068 * via sysfs - until a lack of spares is confirmed.
6070 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
6071 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6073 if (mddev
->sb_flags
)
6074 md_update_sb(mddev
, 0);
6076 md_new_event(mddev
);
6080 mddev_detach(mddev
);
6082 pers
->free(mddev
, mddev
->private);
6083 mddev
->private = NULL
;
6084 module_put(pers
->owner
);
6085 md_bitmap_destroy(mddev
);
6087 bioset_exit(&mddev
->bio_set
);
6088 bioset_exit(&mddev
->sync_set
);
6091 EXPORT_SYMBOL_GPL(md_run
);
6093 int do_md_run(struct mddev
*mddev
)
6097 set_bit(MD_NOT_READY
, &mddev
->flags
);
6098 err
= md_run(mddev
);
6101 err
= md_bitmap_load(mddev
);
6103 md_bitmap_destroy(mddev
);
6107 if (mddev_is_clustered(mddev
))
6108 md_allow_write(mddev
);
6110 /* run start up tasks that require md_thread */
6113 md_wakeup_thread(mddev
->thread
);
6114 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
6116 set_capacity_and_notify(mddev
->gendisk
, mddev
->array_sectors
);
6117 clear_bit(MD_NOT_READY
, &mddev
->flags
);
6119 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
6120 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6121 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
6122 sysfs_notify_dirent_safe(mddev
->sysfs_degraded
);
6124 clear_bit(MD_NOT_READY
, &mddev
->flags
);
6128 int md_start(struct mddev
*mddev
)
6132 if (mddev
->pers
->start
) {
6133 set_bit(MD_RECOVERY_WAIT
, &mddev
->recovery
);
6134 md_wakeup_thread(mddev
->thread
);
6135 ret
= mddev
->pers
->start(mddev
);
6136 clear_bit(MD_RECOVERY_WAIT
, &mddev
->recovery
);
6137 md_wakeup_thread(mddev
->sync_thread
);
6141 EXPORT_SYMBOL_GPL(md_start
);
6143 static int restart_array(struct mddev
*mddev
)
6145 struct gendisk
*disk
= mddev
->gendisk
;
6146 struct md_rdev
*rdev
;
6147 bool has_journal
= false;
6148 bool has_readonly
= false;
6150 /* Complain if it has no devices */
6151 if (list_empty(&mddev
->disks
))
6159 rdev_for_each_rcu(rdev
, mddev
) {
6160 if (test_bit(Journal
, &rdev
->flags
) &&
6161 !test_bit(Faulty
, &rdev
->flags
))
6163 if (rdev_read_only(rdev
))
6164 has_readonly
= true;
6167 if (test_bit(MD_HAS_JOURNAL
, &mddev
->flags
) && !has_journal
)
6168 /* Don't restart rw with journal missing/faulty */
6173 mddev
->safemode
= 0;
6175 set_disk_ro(disk
, 0);
6176 pr_debug("md: %s switched to read-write mode.\n", mdname(mddev
));
6177 /* Kick recovery or resync if necessary */
6178 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6179 md_wakeup_thread(mddev
->thread
);
6180 md_wakeup_thread(mddev
->sync_thread
);
6181 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6185 static void md_clean(struct mddev
*mddev
)
6187 mddev
->array_sectors
= 0;
6188 mddev
->external_size
= 0;
6189 mddev
->dev_sectors
= 0;
6190 mddev
->raid_disks
= 0;
6191 mddev
->recovery_cp
= 0;
6192 mddev
->resync_min
= 0;
6193 mddev
->resync_max
= MaxSector
;
6194 mddev
->reshape_position
= MaxSector
;
6195 mddev
->external
= 0;
6196 mddev
->persistent
= 0;
6197 mddev
->level
= LEVEL_NONE
;
6198 mddev
->clevel
[0] = 0;
6200 mddev
->sb_flags
= 0;
6202 mddev
->metadata_type
[0] = 0;
6203 mddev
->chunk_sectors
= 0;
6204 mddev
->ctime
= mddev
->utime
= 0;
6206 mddev
->max_disks
= 0;
6208 mddev
->can_decrease_events
= 0;
6209 mddev
->delta_disks
= 0;
6210 mddev
->reshape_backwards
= 0;
6211 mddev
->new_level
= LEVEL_NONE
;
6212 mddev
->new_layout
= 0;
6213 mddev
->new_chunk_sectors
= 0;
6214 mddev
->curr_resync
= 0;
6215 atomic64_set(&mddev
->resync_mismatches
, 0);
6216 mddev
->suspend_lo
= mddev
->suspend_hi
= 0;
6217 mddev
->sync_speed_min
= mddev
->sync_speed_max
= 0;
6218 mddev
->recovery
= 0;
6221 mddev
->degraded
= 0;
6222 mddev
->safemode
= 0;
6223 mddev
->private = NULL
;
6224 mddev
->cluster_info
= NULL
;
6225 mddev
->bitmap_info
.offset
= 0;
6226 mddev
->bitmap_info
.default_offset
= 0;
6227 mddev
->bitmap_info
.default_space
= 0;
6228 mddev
->bitmap_info
.chunksize
= 0;
6229 mddev
->bitmap_info
.daemon_sleep
= 0;
6230 mddev
->bitmap_info
.max_write_behind
= 0;
6231 mddev
->bitmap_info
.nodes
= 0;
6234 static void __md_stop_writes(struct mddev
*mddev
)
6236 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
6237 if (work_pending(&mddev
->del_work
))
6238 flush_workqueue(md_misc_wq
);
6239 if (mddev
->sync_thread
) {
6240 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6241 md_reap_sync_thread(mddev
);
6244 del_timer_sync(&mddev
->safemode_timer
);
6246 if (mddev
->pers
&& mddev
->pers
->quiesce
) {
6247 mddev
->pers
->quiesce(mddev
, 1);
6248 mddev
->pers
->quiesce(mddev
, 0);
6250 md_bitmap_flush(mddev
);
6252 if (mddev
->ro
== 0 &&
6253 ((!mddev
->in_sync
&& !mddev_is_clustered(mddev
)) ||
6255 /* mark array as shutdown cleanly */
6256 if (!mddev_is_clustered(mddev
))
6258 md_update_sb(mddev
, 1);
6260 /* disable policy to guarantee rdevs free resources for serialization */
6261 mddev
->serialize_policy
= 0;
6262 mddev_destroy_serial_pool(mddev
, NULL
, true);
6265 void md_stop_writes(struct mddev
*mddev
)
6267 mddev_lock_nointr(mddev
);
6268 __md_stop_writes(mddev
);
6269 mddev_unlock(mddev
);
6271 EXPORT_SYMBOL_GPL(md_stop_writes
);
6273 static void mddev_detach(struct mddev
*mddev
)
6275 md_bitmap_wait_behind_writes(mddev
);
6276 if (mddev
->pers
&& mddev
->pers
->quiesce
&& !mddev
->suspended
) {
6277 mddev
->pers
->quiesce(mddev
, 1);
6278 mddev
->pers
->quiesce(mddev
, 0);
6280 md_unregister_thread(&mddev
->thread
);
6282 blk_sync_queue(mddev
->queue
); /* the unplug fn references 'conf'*/
6285 static void __md_stop(struct mddev
*mddev
)
6287 struct md_personality
*pers
= mddev
->pers
;
6288 md_bitmap_destroy(mddev
);
6289 mddev_detach(mddev
);
6290 /* Ensure ->event_work is done */
6291 if (mddev
->event_work
.func
)
6292 flush_workqueue(md_misc_wq
);
6293 spin_lock(&mddev
->lock
);
6295 spin_unlock(&mddev
->lock
);
6296 pers
->free(mddev
, mddev
->private);
6297 mddev
->private = NULL
;
6298 if (pers
->sync_request
&& mddev
->to_remove
== NULL
)
6299 mddev
->to_remove
= &md_redundancy_group
;
6300 module_put(pers
->owner
);
6301 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
6304 void md_stop(struct mddev
*mddev
)
6306 /* stop the array and free an attached data structures.
6307 * This is called from dm-raid
6310 bioset_exit(&mddev
->bio_set
);
6311 bioset_exit(&mddev
->sync_set
);
6314 EXPORT_SYMBOL_GPL(md_stop
);
6316 static int md_set_readonly(struct mddev
*mddev
, struct block_device
*bdev
)
6321 if (!test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
)) {
6323 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
6324 md_wakeup_thread(mddev
->thread
);
6326 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
6327 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6328 if (mddev
->sync_thread
)
6329 /* Thread might be blocked waiting for metadata update
6330 * which will now never happen */
6331 wake_up_process(mddev
->sync_thread
->tsk
);
6333 if (mddev
->external
&& test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
))
6335 mddev_unlock(mddev
);
6336 wait_event(resync_wait
, !test_bit(MD_RECOVERY_RUNNING
,
6338 wait_event(mddev
->sb_wait
,
6339 !test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
));
6340 mddev_lock_nointr(mddev
);
6342 mutex_lock(&mddev
->open_mutex
);
6343 if ((mddev
->pers
&& atomic_read(&mddev
->openers
) > !!bdev
) ||
6344 mddev
->sync_thread
||
6345 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
)) {
6346 pr_warn("md: %s still in use.\n",mdname(mddev
));
6348 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
6349 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6350 md_wakeup_thread(mddev
->thread
);
6356 __md_stop_writes(mddev
);
6362 set_disk_ro(mddev
->gendisk
, 1);
6363 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
6364 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6365 md_wakeup_thread(mddev
->thread
);
6366 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6370 mutex_unlock(&mddev
->open_mutex
);
6375 * 0 - completely stop and dis-assemble array
6376 * 2 - stop but do not disassemble array
6378 static int do_md_stop(struct mddev
*mddev
, int mode
,
6379 struct block_device
*bdev
)
6381 struct gendisk
*disk
= mddev
->gendisk
;
6382 struct md_rdev
*rdev
;
6385 if (!test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
)) {
6387 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
6388 md_wakeup_thread(mddev
->thread
);
6390 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
6391 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6392 if (mddev
->sync_thread
)
6393 /* Thread might be blocked waiting for metadata update
6394 * which will now never happen */
6395 wake_up_process(mddev
->sync_thread
->tsk
);
6397 mddev_unlock(mddev
);
6398 wait_event(resync_wait
, (mddev
->sync_thread
== NULL
&&
6399 !test_bit(MD_RECOVERY_RUNNING
,
6400 &mddev
->recovery
)));
6401 mddev_lock_nointr(mddev
);
6403 mutex_lock(&mddev
->open_mutex
);
6404 if ((mddev
->pers
&& atomic_read(&mddev
->openers
) > !!bdev
) ||
6405 mddev
->sysfs_active
||
6406 mddev
->sync_thread
||
6407 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
)) {
6408 pr_warn("md: %s still in use.\n",mdname(mddev
));
6409 mutex_unlock(&mddev
->open_mutex
);
6411 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
6412 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6413 md_wakeup_thread(mddev
->thread
);
6419 set_disk_ro(disk
, 0);
6421 __md_stop_writes(mddev
);
6424 /* tell userspace to handle 'inactive' */
6425 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6427 rdev_for_each(rdev
, mddev
)
6428 if (rdev
->raid_disk
>= 0)
6429 sysfs_unlink_rdev(mddev
, rdev
);
6431 set_capacity_and_notify(disk
, 0);
6432 mutex_unlock(&mddev
->open_mutex
);
6438 mutex_unlock(&mddev
->open_mutex
);
6440 * Free resources if final stop
6443 pr_info("md: %s stopped.\n", mdname(mddev
));
6445 if (mddev
->bitmap_info
.file
) {
6446 struct file
*f
= mddev
->bitmap_info
.file
;
6447 spin_lock(&mddev
->lock
);
6448 mddev
->bitmap_info
.file
= NULL
;
6449 spin_unlock(&mddev
->lock
);
6452 mddev
->bitmap_info
.offset
= 0;
6454 export_array(mddev
);
6457 if (mddev
->hold_active
== UNTIL_STOP
)
6458 mddev
->hold_active
= 0;
6460 md_new_event(mddev
);
6461 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6466 static void autorun_array(struct mddev
*mddev
)
6468 struct md_rdev
*rdev
;
6471 if (list_empty(&mddev
->disks
))
6474 pr_info("md: running: ");
6476 rdev_for_each(rdev
, mddev
) {
6477 char b
[BDEVNAME_SIZE
];
6478 pr_cont("<%s>", bdevname(rdev
->bdev
,b
));
6482 err
= do_md_run(mddev
);
6484 pr_warn("md: do_md_run() returned %d\n", err
);
6485 do_md_stop(mddev
, 0, NULL
);
6490 * lets try to run arrays based on all disks that have arrived
6491 * until now. (those are in pending_raid_disks)
6493 * the method: pick the first pending disk, collect all disks with
6494 * the same UUID, remove all from the pending list and put them into
6495 * the 'same_array' list. Then order this list based on superblock
6496 * update time (freshest comes first), kick out 'old' disks and
6497 * compare superblocks. If everything's fine then run it.
6499 * If "unit" is allocated, then bump its reference count
6501 static void autorun_devices(int part
)
6503 struct md_rdev
*rdev0
, *rdev
, *tmp
;
6504 struct mddev
*mddev
;
6505 char b
[BDEVNAME_SIZE
];
6507 pr_info("md: autorun ...\n");
6508 while (!list_empty(&pending_raid_disks
)) {
6511 LIST_HEAD(candidates
);
6512 rdev0
= list_entry(pending_raid_disks
.next
,
6513 struct md_rdev
, same_set
);
6515 pr_debug("md: considering %s ...\n", bdevname(rdev0
->bdev
,b
));
6516 INIT_LIST_HEAD(&candidates
);
6517 rdev_for_each_list(rdev
, tmp
, &pending_raid_disks
)
6518 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
6519 pr_debug("md: adding %s ...\n",
6520 bdevname(rdev
->bdev
,b
));
6521 list_move(&rdev
->same_set
, &candidates
);
6524 * now we have a set of devices, with all of them having
6525 * mostly sane superblocks. It's time to allocate the
6529 dev
= MKDEV(mdp_major
,
6530 rdev0
->preferred_minor
<< MdpMinorShift
);
6531 unit
= MINOR(dev
) >> MdpMinorShift
;
6533 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
6536 if (rdev0
->preferred_minor
!= unit
) {
6537 pr_warn("md: unit number in %s is bad: %d\n",
6538 bdevname(rdev0
->bdev
, b
), rdev0
->preferred_minor
);
6543 mddev
= mddev_find(dev
);
6547 if (mddev_lock(mddev
))
6548 pr_warn("md: %s locked, cannot run\n", mdname(mddev
));
6549 else if (mddev
->raid_disks
|| mddev
->major_version
6550 || !list_empty(&mddev
->disks
)) {
6551 pr_warn("md: %s already running, cannot run %s\n",
6552 mdname(mddev
), bdevname(rdev0
->bdev
,b
));
6553 mddev_unlock(mddev
);
6555 pr_debug("md: created %s\n", mdname(mddev
));
6556 mddev
->persistent
= 1;
6557 rdev_for_each_list(rdev
, tmp
, &candidates
) {
6558 list_del_init(&rdev
->same_set
);
6559 if (bind_rdev_to_array(rdev
, mddev
))
6562 autorun_array(mddev
);
6563 mddev_unlock(mddev
);
6565 /* on success, candidates will be empty, on error
6568 rdev_for_each_list(rdev
, tmp
, &candidates
) {
6569 list_del_init(&rdev
->same_set
);
6574 pr_info("md: ... autorun DONE.\n");
6576 #endif /* !MODULE */
6578 static int get_version(void __user
*arg
)
6582 ver
.major
= MD_MAJOR_VERSION
;
6583 ver
.minor
= MD_MINOR_VERSION
;
6584 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
6586 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
6592 static int get_array_info(struct mddev
*mddev
, void __user
*arg
)
6594 mdu_array_info_t info
;
6595 int nr
,working
,insync
,failed
,spare
;
6596 struct md_rdev
*rdev
;
6598 nr
= working
= insync
= failed
= spare
= 0;
6600 rdev_for_each_rcu(rdev
, mddev
) {
6602 if (test_bit(Faulty
, &rdev
->flags
))
6606 if (test_bit(In_sync
, &rdev
->flags
))
6608 else if (test_bit(Journal
, &rdev
->flags
))
6609 /* TODO: add journal count to md_u.h */
6617 info
.major_version
= mddev
->major_version
;
6618 info
.minor_version
= mddev
->minor_version
;
6619 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
6620 info
.ctime
= clamp_t(time64_t
, mddev
->ctime
, 0, U32_MAX
);
6621 info
.level
= mddev
->level
;
6622 info
.size
= mddev
->dev_sectors
/ 2;
6623 if (info
.size
!= mddev
->dev_sectors
/ 2) /* overflow */
6626 info
.raid_disks
= mddev
->raid_disks
;
6627 info
.md_minor
= mddev
->md_minor
;
6628 info
.not_persistent
= !mddev
->persistent
;
6630 info
.utime
= clamp_t(time64_t
, mddev
->utime
, 0, U32_MAX
);
6633 info
.state
= (1<<MD_SB_CLEAN
);
6634 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
6635 info
.state
|= (1<<MD_SB_BITMAP_PRESENT
);
6636 if (mddev_is_clustered(mddev
))
6637 info
.state
|= (1<<MD_SB_CLUSTERED
);
6638 info
.active_disks
= insync
;
6639 info
.working_disks
= working
;
6640 info
.failed_disks
= failed
;
6641 info
.spare_disks
= spare
;
6643 info
.layout
= mddev
->layout
;
6644 info
.chunk_size
= mddev
->chunk_sectors
<< 9;
6646 if (copy_to_user(arg
, &info
, sizeof(info
)))
6652 static int get_bitmap_file(struct mddev
*mddev
, void __user
* arg
)
6654 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
6658 file
= kzalloc(sizeof(*file
), GFP_NOIO
);
6663 spin_lock(&mddev
->lock
);
6664 /* bitmap enabled */
6665 if (mddev
->bitmap_info
.file
) {
6666 ptr
= file_path(mddev
->bitmap_info
.file
, file
->pathname
,
6667 sizeof(file
->pathname
));
6671 memmove(file
->pathname
, ptr
,
6672 sizeof(file
->pathname
)-(ptr
-file
->pathname
));
6674 spin_unlock(&mddev
->lock
);
6677 copy_to_user(arg
, file
, sizeof(*file
)))
6684 static int get_disk_info(struct mddev
*mddev
, void __user
* arg
)
6686 mdu_disk_info_t info
;
6687 struct md_rdev
*rdev
;
6689 if (copy_from_user(&info
, arg
, sizeof(info
)))
6693 rdev
= md_find_rdev_nr_rcu(mddev
, info
.number
);
6695 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
6696 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
6697 info
.raid_disk
= rdev
->raid_disk
;
6699 if (test_bit(Faulty
, &rdev
->flags
))
6700 info
.state
|= (1<<MD_DISK_FAULTY
);
6701 else if (test_bit(In_sync
, &rdev
->flags
)) {
6702 info
.state
|= (1<<MD_DISK_ACTIVE
);
6703 info
.state
|= (1<<MD_DISK_SYNC
);
6705 if (test_bit(Journal
, &rdev
->flags
))
6706 info
.state
|= (1<<MD_DISK_JOURNAL
);
6707 if (test_bit(WriteMostly
, &rdev
->flags
))
6708 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
6709 if (test_bit(FailFast
, &rdev
->flags
))
6710 info
.state
|= (1<<MD_DISK_FAILFAST
);
6712 info
.major
= info
.minor
= 0;
6713 info
.raid_disk
= -1;
6714 info
.state
= (1<<MD_DISK_REMOVED
);
6718 if (copy_to_user(arg
, &info
, sizeof(info
)))
6724 int md_add_new_disk(struct mddev
*mddev
, struct mdu_disk_info_s
*info
)
6726 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
6727 struct md_rdev
*rdev
;
6728 dev_t dev
= MKDEV(info
->major
,info
->minor
);
6730 if (mddev_is_clustered(mddev
) &&
6731 !(info
->state
& ((1 << MD_DISK_CLUSTER_ADD
) | (1 << MD_DISK_CANDIDATE
)))) {
6732 pr_warn("%s: Cannot add to clustered mddev.\n",
6737 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
6740 if (!mddev
->raid_disks
) {
6742 /* expecting a device which has a superblock */
6743 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
6745 pr_warn("md: md_import_device returned %ld\n",
6747 return PTR_ERR(rdev
);
6749 if (!list_empty(&mddev
->disks
)) {
6750 struct md_rdev
*rdev0
6751 = list_entry(mddev
->disks
.next
,
6752 struct md_rdev
, same_set
);
6753 err
= super_types
[mddev
->major_version
]
6754 .load_super(rdev
, rdev0
, mddev
->minor_version
);
6756 pr_warn("md: %s has different UUID to %s\n",
6757 bdevname(rdev
->bdev
,b
),
6758 bdevname(rdev0
->bdev
,b2
));
6763 err
= bind_rdev_to_array(rdev
, mddev
);
6770 * md_add_new_disk can be used once the array is assembled
6771 * to add "hot spares". They must already have a superblock
6776 if (!mddev
->pers
->hot_add_disk
) {
6777 pr_warn("%s: personality does not support diskops!\n",
6781 if (mddev
->persistent
)
6782 rdev
= md_import_device(dev
, mddev
->major_version
,
6783 mddev
->minor_version
);
6785 rdev
= md_import_device(dev
, -1, -1);
6787 pr_warn("md: md_import_device returned %ld\n",
6789 return PTR_ERR(rdev
);
6791 /* set saved_raid_disk if appropriate */
6792 if (!mddev
->persistent
) {
6793 if (info
->state
& (1<<MD_DISK_SYNC
) &&
6794 info
->raid_disk
< mddev
->raid_disks
) {
6795 rdev
->raid_disk
= info
->raid_disk
;
6796 set_bit(In_sync
, &rdev
->flags
);
6797 clear_bit(Bitmap_sync
, &rdev
->flags
);
6799 rdev
->raid_disk
= -1;
6800 rdev
->saved_raid_disk
= rdev
->raid_disk
;
6802 super_types
[mddev
->major_version
].
6803 validate_super(mddev
, rdev
);
6804 if ((info
->state
& (1<<MD_DISK_SYNC
)) &&
6805 rdev
->raid_disk
!= info
->raid_disk
) {
6806 /* This was a hot-add request, but events doesn't
6807 * match, so reject it.
6813 clear_bit(In_sync
, &rdev
->flags
); /* just to be sure */
6814 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
6815 set_bit(WriteMostly
, &rdev
->flags
);
6817 clear_bit(WriteMostly
, &rdev
->flags
);
6818 if (info
->state
& (1<<MD_DISK_FAILFAST
))
6819 set_bit(FailFast
, &rdev
->flags
);
6821 clear_bit(FailFast
, &rdev
->flags
);
6823 if (info
->state
& (1<<MD_DISK_JOURNAL
)) {
6824 struct md_rdev
*rdev2
;
6825 bool has_journal
= false;
6827 /* make sure no existing journal disk */
6828 rdev_for_each(rdev2
, mddev
) {
6829 if (test_bit(Journal
, &rdev2
->flags
)) {
6834 if (has_journal
|| mddev
->bitmap
) {
6838 set_bit(Journal
, &rdev
->flags
);
6841 * check whether the device shows up in other nodes
6843 if (mddev_is_clustered(mddev
)) {
6844 if (info
->state
& (1 << MD_DISK_CANDIDATE
))
6845 set_bit(Candidate
, &rdev
->flags
);
6846 else if (info
->state
& (1 << MD_DISK_CLUSTER_ADD
)) {
6847 /* --add initiated by this node */
6848 err
= md_cluster_ops
->add_new_disk(mddev
, rdev
);
6856 rdev
->raid_disk
= -1;
6857 err
= bind_rdev_to_array(rdev
, mddev
);
6862 if (mddev_is_clustered(mddev
)) {
6863 if (info
->state
& (1 << MD_DISK_CANDIDATE
)) {
6865 err
= md_cluster_ops
->new_disk_ack(mddev
,
6868 md_kick_rdev_from_array(rdev
);
6872 md_cluster_ops
->add_new_disk_cancel(mddev
);
6874 err
= add_bound_rdev(rdev
);
6878 err
= add_bound_rdev(rdev
);
6883 /* otherwise, md_add_new_disk is only allowed
6884 * for major_version==0 superblocks
6886 if (mddev
->major_version
!= 0) {
6887 pr_warn("%s: ADD_NEW_DISK not supported\n", mdname(mddev
));
6891 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
6893 rdev
= md_import_device(dev
, -1, 0);
6895 pr_warn("md: error, md_import_device() returned %ld\n",
6897 return PTR_ERR(rdev
);
6899 rdev
->desc_nr
= info
->number
;
6900 if (info
->raid_disk
< mddev
->raid_disks
)
6901 rdev
->raid_disk
= info
->raid_disk
;
6903 rdev
->raid_disk
= -1;
6905 if (rdev
->raid_disk
< mddev
->raid_disks
)
6906 if (info
->state
& (1<<MD_DISK_SYNC
))
6907 set_bit(In_sync
, &rdev
->flags
);
6909 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
6910 set_bit(WriteMostly
, &rdev
->flags
);
6911 if (info
->state
& (1<<MD_DISK_FAILFAST
))
6912 set_bit(FailFast
, &rdev
->flags
);
6914 if (!mddev
->persistent
) {
6915 pr_debug("md: nonpersistent superblock ...\n");
6916 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
6918 rdev
->sb_start
= calc_dev_sboffset(rdev
);
6919 rdev
->sectors
= rdev
->sb_start
;
6921 err
= bind_rdev_to_array(rdev
, mddev
);
6931 static int hot_remove_disk(struct mddev
*mddev
, dev_t dev
)
6933 char b
[BDEVNAME_SIZE
];
6934 struct md_rdev
*rdev
;
6939 rdev
= find_rdev(mddev
, dev
);
6943 if (rdev
->raid_disk
< 0)
6946 clear_bit(Blocked
, &rdev
->flags
);
6947 remove_and_add_spares(mddev
, rdev
);
6949 if (rdev
->raid_disk
>= 0)
6953 if (mddev_is_clustered(mddev
)) {
6954 if (md_cluster_ops
->remove_disk(mddev
, rdev
))
6958 md_kick_rdev_from_array(rdev
);
6959 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
6961 md_wakeup_thread(mddev
->thread
);
6963 md_update_sb(mddev
, 1);
6964 md_new_event(mddev
);
6968 pr_debug("md: cannot remove active disk %s from %s ...\n",
6969 bdevname(rdev
->bdev
,b
), mdname(mddev
));
6973 static int hot_add_disk(struct mddev
*mddev
, dev_t dev
)
6975 char b
[BDEVNAME_SIZE
];
6977 struct md_rdev
*rdev
;
6982 if (mddev
->major_version
!= 0) {
6983 pr_warn("%s: HOT_ADD may only be used with version-0 superblocks.\n",
6987 if (!mddev
->pers
->hot_add_disk
) {
6988 pr_warn("%s: personality does not support diskops!\n",
6993 rdev
= md_import_device(dev
, -1, 0);
6995 pr_warn("md: error, md_import_device() returned %ld\n",
7000 if (mddev
->persistent
)
7001 rdev
->sb_start
= calc_dev_sboffset(rdev
);
7003 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
7005 rdev
->sectors
= rdev
->sb_start
;
7007 if (test_bit(Faulty
, &rdev
->flags
)) {
7008 pr_warn("md: can not hot-add faulty %s disk to %s!\n",
7009 bdevname(rdev
->bdev
,b
), mdname(mddev
));
7014 clear_bit(In_sync
, &rdev
->flags
);
7016 rdev
->saved_raid_disk
= -1;
7017 err
= bind_rdev_to_array(rdev
, mddev
);
7022 * The rest should better be atomic, we can have disk failures
7023 * noticed in interrupt contexts ...
7026 rdev
->raid_disk
= -1;
7028 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
7030 md_update_sb(mddev
, 1);
7032 * Kick recovery, maybe this spare has to be added to the
7033 * array immediately.
7035 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7036 md_wakeup_thread(mddev
->thread
);
7037 md_new_event(mddev
);
7045 static int set_bitmap_file(struct mddev
*mddev
, int fd
)
7050 if (!mddev
->pers
->quiesce
|| !mddev
->thread
)
7052 if (mddev
->recovery
|| mddev
->sync_thread
)
7054 /* we should be able to change the bitmap.. */
7058 struct inode
*inode
;
7061 if (mddev
->bitmap
|| mddev
->bitmap_info
.file
)
7062 return -EEXIST
; /* cannot add when bitmap is present */
7066 pr_warn("%s: error: failed to get bitmap file\n",
7071 inode
= f
->f_mapping
->host
;
7072 if (!S_ISREG(inode
->i_mode
)) {
7073 pr_warn("%s: error: bitmap file must be a regular file\n",
7076 } else if (!(f
->f_mode
& FMODE_WRITE
)) {
7077 pr_warn("%s: error: bitmap file must open for write\n",
7080 } else if (atomic_read(&inode
->i_writecount
) != 1) {
7081 pr_warn("%s: error: bitmap file is already in use\n",
7089 mddev
->bitmap_info
.file
= f
;
7090 mddev
->bitmap_info
.offset
= 0; /* file overrides offset */
7091 } else if (mddev
->bitmap
== NULL
)
7092 return -ENOENT
; /* cannot remove what isn't there */
7096 struct bitmap
*bitmap
;
7098 bitmap
= md_bitmap_create(mddev
, -1);
7099 mddev_suspend(mddev
);
7100 if (!IS_ERR(bitmap
)) {
7101 mddev
->bitmap
= bitmap
;
7102 err
= md_bitmap_load(mddev
);
7104 err
= PTR_ERR(bitmap
);
7106 md_bitmap_destroy(mddev
);
7109 mddev_resume(mddev
);
7110 } else if (fd
< 0) {
7111 mddev_suspend(mddev
);
7112 md_bitmap_destroy(mddev
);
7113 mddev_resume(mddev
);
7117 struct file
*f
= mddev
->bitmap_info
.file
;
7119 spin_lock(&mddev
->lock
);
7120 mddev
->bitmap_info
.file
= NULL
;
7121 spin_unlock(&mddev
->lock
);
7130 * md_set_array_info is used two different ways
7131 * The original usage is when creating a new array.
7132 * In this usage, raid_disks is > 0 and it together with
7133 * level, size, not_persistent,layout,chunksize determine the
7134 * shape of the array.
7135 * This will always create an array with a type-0.90.0 superblock.
7136 * The newer usage is when assembling an array.
7137 * In this case raid_disks will be 0, and the major_version field is
7138 * use to determine which style super-blocks are to be found on the devices.
7139 * The minor and patch _version numbers are also kept incase the
7140 * super_block handler wishes to interpret them.
7142 int md_set_array_info(struct mddev
*mddev
, struct mdu_array_info_s
*info
)
7144 if (info
->raid_disks
== 0) {
7145 /* just setting version number for superblock loading */
7146 if (info
->major_version
< 0 ||
7147 info
->major_version
>= ARRAY_SIZE(super_types
) ||
7148 super_types
[info
->major_version
].name
== NULL
) {
7149 /* maybe try to auto-load a module? */
7150 pr_warn("md: superblock version %d not known\n",
7151 info
->major_version
);
7154 mddev
->major_version
= info
->major_version
;
7155 mddev
->minor_version
= info
->minor_version
;
7156 mddev
->patch_version
= info
->patch_version
;
7157 mddev
->persistent
= !info
->not_persistent
;
7158 /* ensure mddev_put doesn't delete this now that there
7159 * is some minimal configuration.
7161 mddev
->ctime
= ktime_get_real_seconds();
7164 mddev
->major_version
= MD_MAJOR_VERSION
;
7165 mddev
->minor_version
= MD_MINOR_VERSION
;
7166 mddev
->patch_version
= MD_PATCHLEVEL_VERSION
;
7167 mddev
->ctime
= ktime_get_real_seconds();
7169 mddev
->level
= info
->level
;
7170 mddev
->clevel
[0] = 0;
7171 mddev
->dev_sectors
= 2 * (sector_t
)info
->size
;
7172 mddev
->raid_disks
= info
->raid_disks
;
7173 /* don't set md_minor, it is determined by which /dev/md* was
7176 if (info
->state
& (1<<MD_SB_CLEAN
))
7177 mddev
->recovery_cp
= MaxSector
;
7179 mddev
->recovery_cp
= 0;
7180 mddev
->persistent
= ! info
->not_persistent
;
7181 mddev
->external
= 0;
7183 mddev
->layout
= info
->layout
;
7184 if (mddev
->level
== 0)
7185 /* Cannot trust RAID0 layout info here */
7187 mddev
->chunk_sectors
= info
->chunk_size
>> 9;
7189 if (mddev
->persistent
) {
7190 mddev
->max_disks
= MD_SB_DISKS
;
7192 mddev
->sb_flags
= 0;
7194 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
7196 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
7197 mddev
->bitmap_info
.default_space
= 64*2 - (MD_SB_BYTES
>> 9);
7198 mddev
->bitmap_info
.offset
= 0;
7200 mddev
->reshape_position
= MaxSector
;
7203 * Generate a 128 bit UUID
7205 get_random_bytes(mddev
->uuid
, 16);
7207 mddev
->new_level
= mddev
->level
;
7208 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
7209 mddev
->new_layout
= mddev
->layout
;
7210 mddev
->delta_disks
= 0;
7211 mddev
->reshape_backwards
= 0;
7216 void md_set_array_sectors(struct mddev
*mddev
, sector_t array_sectors
)
7218 lockdep_assert_held(&mddev
->reconfig_mutex
);
7220 if (mddev
->external_size
)
7223 mddev
->array_sectors
= array_sectors
;
7225 EXPORT_SYMBOL(md_set_array_sectors
);
7227 static int update_size(struct mddev
*mddev
, sector_t num_sectors
)
7229 struct md_rdev
*rdev
;
7231 int fit
= (num_sectors
== 0);
7232 sector_t old_dev_sectors
= mddev
->dev_sectors
;
7234 if (mddev
->pers
->resize
== NULL
)
7236 /* The "num_sectors" is the number of sectors of each device that
7237 * is used. This can only make sense for arrays with redundancy.
7238 * linear and raid0 always use whatever space is available. We can only
7239 * consider changing this number if no resync or reconstruction is
7240 * happening, and if the new size is acceptable. It must fit before the
7241 * sb_start or, if that is <data_offset, it must fit before the size
7242 * of each device. If num_sectors is zero, we find the largest size
7245 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
7251 rdev_for_each(rdev
, mddev
) {
7252 sector_t avail
= rdev
->sectors
;
7254 if (fit
&& (num_sectors
== 0 || num_sectors
> avail
))
7255 num_sectors
= avail
;
7256 if (avail
< num_sectors
)
7259 rv
= mddev
->pers
->resize(mddev
, num_sectors
);
7261 if (mddev_is_clustered(mddev
))
7262 md_cluster_ops
->update_size(mddev
, old_dev_sectors
);
7263 else if (mddev
->queue
) {
7264 set_capacity_and_notify(mddev
->gendisk
,
7265 mddev
->array_sectors
);
7271 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
)
7274 struct md_rdev
*rdev
;
7275 /* change the number of raid disks */
7276 if (mddev
->pers
->check_reshape
== NULL
)
7280 if (raid_disks
<= 0 ||
7281 (mddev
->max_disks
&& raid_disks
>= mddev
->max_disks
))
7283 if (mddev
->sync_thread
||
7284 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
7285 test_bit(MD_RESYNCING_REMOTE
, &mddev
->recovery
) ||
7286 mddev
->reshape_position
!= MaxSector
)
7289 rdev_for_each(rdev
, mddev
) {
7290 if (mddev
->raid_disks
< raid_disks
&&
7291 rdev
->data_offset
< rdev
->new_data_offset
)
7293 if (mddev
->raid_disks
> raid_disks
&&
7294 rdev
->data_offset
> rdev
->new_data_offset
)
7298 mddev
->delta_disks
= raid_disks
- mddev
->raid_disks
;
7299 if (mddev
->delta_disks
< 0)
7300 mddev
->reshape_backwards
= 1;
7301 else if (mddev
->delta_disks
> 0)
7302 mddev
->reshape_backwards
= 0;
7304 rv
= mddev
->pers
->check_reshape(mddev
);
7306 mddev
->delta_disks
= 0;
7307 mddev
->reshape_backwards
= 0;
7313 * update_array_info is used to change the configuration of an
7315 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
7316 * fields in the info are checked against the array.
7317 * Any differences that cannot be handled will cause an error.
7318 * Normally, only one change can be managed at a time.
7320 static int update_array_info(struct mddev
*mddev
, mdu_array_info_t
*info
)
7326 /* calculate expected state,ignoring low bits */
7327 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
7328 state
|= (1 << MD_SB_BITMAP_PRESENT
);
7330 if (mddev
->major_version
!= info
->major_version
||
7331 mddev
->minor_version
!= info
->minor_version
||
7332 /* mddev->patch_version != info->patch_version || */
7333 mddev
->ctime
!= info
->ctime
||
7334 mddev
->level
!= info
->level
||
7335 /* mddev->layout != info->layout || */
7336 mddev
->persistent
!= !info
->not_persistent
||
7337 mddev
->chunk_sectors
!= info
->chunk_size
>> 9 ||
7338 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
7339 ((state
^info
->state
) & 0xfffffe00)
7342 /* Check there is only one change */
7343 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
7345 if (mddev
->raid_disks
!= info
->raid_disks
)
7347 if (mddev
->layout
!= info
->layout
)
7349 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
))
7356 if (mddev
->layout
!= info
->layout
) {
7358 * we don't need to do anything at the md level, the
7359 * personality will take care of it all.
7361 if (mddev
->pers
->check_reshape
== NULL
)
7364 mddev
->new_layout
= info
->layout
;
7365 rv
= mddev
->pers
->check_reshape(mddev
);
7367 mddev
->new_layout
= mddev
->layout
;
7371 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
7372 rv
= update_size(mddev
, (sector_t
)info
->size
* 2);
7374 if (mddev
->raid_disks
!= info
->raid_disks
)
7375 rv
= update_raid_disks(mddev
, info
->raid_disks
);
7377 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) {
7378 if (mddev
->pers
->quiesce
== NULL
|| mddev
->thread
== NULL
) {
7382 if (mddev
->recovery
|| mddev
->sync_thread
) {
7386 if (info
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
7387 struct bitmap
*bitmap
;
7388 /* add the bitmap */
7389 if (mddev
->bitmap
) {
7393 if (mddev
->bitmap_info
.default_offset
== 0) {
7397 mddev
->bitmap_info
.offset
=
7398 mddev
->bitmap_info
.default_offset
;
7399 mddev
->bitmap_info
.space
=
7400 mddev
->bitmap_info
.default_space
;
7401 bitmap
= md_bitmap_create(mddev
, -1);
7402 mddev_suspend(mddev
);
7403 if (!IS_ERR(bitmap
)) {
7404 mddev
->bitmap
= bitmap
;
7405 rv
= md_bitmap_load(mddev
);
7407 rv
= PTR_ERR(bitmap
);
7409 md_bitmap_destroy(mddev
);
7410 mddev_resume(mddev
);
7412 /* remove the bitmap */
7413 if (!mddev
->bitmap
) {
7417 if (mddev
->bitmap
->storage
.file
) {
7421 if (mddev
->bitmap_info
.nodes
) {
7422 /* hold PW on all the bitmap lock */
7423 if (md_cluster_ops
->lock_all_bitmaps(mddev
) <= 0) {
7424 pr_warn("md: can't change bitmap to none since the array is in use by more than one node\n");
7426 md_cluster_ops
->unlock_all_bitmaps(mddev
);
7430 mddev
->bitmap_info
.nodes
= 0;
7431 md_cluster_ops
->leave(mddev
);
7432 module_put(md_cluster_mod
);
7433 mddev
->safemode_delay
= DEFAULT_SAFEMODE_DELAY
;
7435 mddev_suspend(mddev
);
7436 md_bitmap_destroy(mddev
);
7437 mddev_resume(mddev
);
7438 mddev
->bitmap_info
.offset
= 0;
7441 md_update_sb(mddev
, 1);
7447 static int set_disk_faulty(struct mddev
*mddev
, dev_t dev
)
7449 struct md_rdev
*rdev
;
7452 if (mddev
->pers
== NULL
)
7456 rdev
= md_find_rdev_rcu(mddev
, dev
);
7460 md_error(mddev
, rdev
);
7461 if (!test_bit(Faulty
, &rdev
->flags
))
7469 * We have a problem here : there is no easy way to give a CHS
7470 * virtual geometry. We currently pretend that we have a 2 heads
7471 * 4 sectors (with a BIG number of cylinders...). This drives
7472 * dosfs just mad... ;-)
7474 static int md_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
7476 struct mddev
*mddev
= bdev
->bd_disk
->private_data
;
7480 geo
->cylinders
= mddev
->array_sectors
/ 8;
7484 static inline bool md_ioctl_valid(unsigned int cmd
)
7488 case GET_ARRAY_INFO
:
7489 case GET_BITMAP_FILE
:
7492 case HOT_REMOVE_DISK
:
7494 case RESTART_ARRAY_RW
:
7496 case SET_ARRAY_INFO
:
7497 case SET_BITMAP_FILE
:
7498 case SET_DISK_FAULTY
:
7501 case CLUSTERED_DISK_NACK
:
7508 static int md_ioctl(struct block_device
*bdev
, fmode_t mode
,
7509 unsigned int cmd
, unsigned long arg
)
7512 void __user
*argp
= (void __user
*)arg
;
7513 struct mddev
*mddev
= NULL
;
7514 bool did_set_md_closing
= false;
7516 if (!md_ioctl_valid(cmd
))
7521 case GET_ARRAY_INFO
:
7525 if (!capable(CAP_SYS_ADMIN
))
7530 * Commands dealing with the RAID driver but not any
7535 err
= get_version(argp
);
7541 * Commands creating/starting a new array:
7544 mddev
= bdev
->bd_disk
->private_data
;
7551 /* Some actions do not requires the mutex */
7553 case GET_ARRAY_INFO
:
7554 if (!mddev
->raid_disks
&& !mddev
->external
)
7557 err
= get_array_info(mddev
, argp
);
7561 if (!mddev
->raid_disks
&& !mddev
->external
)
7564 err
= get_disk_info(mddev
, argp
);
7567 case SET_DISK_FAULTY
:
7568 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
7571 case GET_BITMAP_FILE
:
7572 err
= get_bitmap_file(mddev
, argp
);
7577 if (cmd
== ADD_NEW_DISK
|| cmd
== HOT_ADD_DISK
)
7578 flush_rdev_wq(mddev
);
7580 if (cmd
== HOT_REMOVE_DISK
)
7581 /* need to ensure recovery thread has run */
7582 wait_event_interruptible_timeout(mddev
->sb_wait
,
7583 !test_bit(MD_RECOVERY_NEEDED
,
7585 msecs_to_jiffies(5000));
7586 if (cmd
== STOP_ARRAY
|| cmd
== STOP_ARRAY_RO
) {
7587 /* Need to flush page cache, and ensure no-one else opens
7590 mutex_lock(&mddev
->open_mutex
);
7591 if (mddev
->pers
&& atomic_read(&mddev
->openers
) > 1) {
7592 mutex_unlock(&mddev
->open_mutex
);
7596 if (test_and_set_bit(MD_CLOSING
, &mddev
->flags
)) {
7597 mutex_unlock(&mddev
->open_mutex
);
7601 did_set_md_closing
= true;
7602 mutex_unlock(&mddev
->open_mutex
);
7603 sync_blockdev(bdev
);
7605 err
= mddev_lock(mddev
);
7607 pr_debug("md: ioctl lock interrupted, reason %d, cmd %d\n",
7612 if (cmd
== SET_ARRAY_INFO
) {
7613 mdu_array_info_t info
;
7615 memset(&info
, 0, sizeof(info
));
7616 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
7621 err
= update_array_info(mddev
, &info
);
7623 pr_warn("md: couldn't update array info. %d\n", err
);
7628 if (!list_empty(&mddev
->disks
)) {
7629 pr_warn("md: array %s already has disks!\n", mdname(mddev
));
7633 if (mddev
->raid_disks
) {
7634 pr_warn("md: array %s already initialised!\n", mdname(mddev
));
7638 err
= md_set_array_info(mddev
, &info
);
7640 pr_warn("md: couldn't set array info. %d\n", err
);
7647 * Commands querying/configuring an existing array:
7649 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
7650 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
7651 if ((!mddev
->raid_disks
&& !mddev
->external
)
7652 && cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
7653 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
7654 && cmd
!= GET_BITMAP_FILE
) {
7660 * Commands even a read-only array can execute:
7663 case RESTART_ARRAY_RW
:
7664 err
= restart_array(mddev
);
7668 err
= do_md_stop(mddev
, 0, bdev
);
7672 err
= md_set_readonly(mddev
, bdev
);
7675 case HOT_REMOVE_DISK
:
7676 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
7680 /* We can support ADD_NEW_DISK on read-only arrays
7681 * only if we are re-adding a preexisting device.
7682 * So require mddev->pers and MD_DISK_SYNC.
7685 mdu_disk_info_t info
;
7686 if (copy_from_user(&info
, argp
, sizeof(info
)))
7688 else if (!(info
.state
& (1<<MD_DISK_SYNC
)))
7689 /* Need to clear read-only for this */
7692 err
= md_add_new_disk(mddev
, &info
);
7699 * The remaining ioctls are changing the state of the
7700 * superblock, so we do not allow them on read-only arrays.
7702 if (mddev
->ro
&& mddev
->pers
) {
7703 if (mddev
->ro
== 2) {
7705 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7706 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7707 /* mddev_unlock will wake thread */
7708 /* If a device failed while we were read-only, we
7709 * need to make sure the metadata is updated now.
7711 if (test_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
)) {
7712 mddev_unlock(mddev
);
7713 wait_event(mddev
->sb_wait
,
7714 !test_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
) &&
7715 !test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
));
7716 mddev_lock_nointr(mddev
);
7727 mdu_disk_info_t info
;
7728 if (copy_from_user(&info
, argp
, sizeof(info
)))
7731 err
= md_add_new_disk(mddev
, &info
);
7735 case CLUSTERED_DISK_NACK
:
7736 if (mddev_is_clustered(mddev
))
7737 md_cluster_ops
->new_disk_ack(mddev
, false);
7743 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
7747 err
= do_md_run(mddev
);
7750 case SET_BITMAP_FILE
:
7751 err
= set_bitmap_file(mddev
, (int)arg
);
7760 if (mddev
->hold_active
== UNTIL_IOCTL
&&
7762 mddev
->hold_active
= 0;
7763 mddev_unlock(mddev
);
7765 if(did_set_md_closing
)
7766 clear_bit(MD_CLOSING
, &mddev
->flags
);
7769 #ifdef CONFIG_COMPAT
7770 static int md_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
7771 unsigned int cmd
, unsigned long arg
)
7774 case HOT_REMOVE_DISK
:
7776 case SET_DISK_FAULTY
:
7777 case SET_BITMAP_FILE
:
7778 /* These take in integer arg, do not convert */
7781 arg
= (unsigned long)compat_ptr(arg
);
7785 return md_ioctl(bdev
, mode
, cmd
, arg
);
7787 #endif /* CONFIG_COMPAT */
7789 static int md_set_read_only(struct block_device
*bdev
, bool ro
)
7791 struct mddev
*mddev
= bdev
->bd_disk
->private_data
;
7794 err
= mddev_lock(mddev
);
7798 if (!mddev
->raid_disks
&& !mddev
->external
) {
7804 * Transitioning to read-auto need only happen for arrays that call
7805 * md_write_start and which are not ready for writes yet.
7807 if (!ro
&& mddev
->ro
== 1 && mddev
->pers
) {
7808 err
= restart_array(mddev
);
7815 mddev_unlock(mddev
);
7819 static int md_open(struct block_device
*bdev
, fmode_t mode
)
7822 * Succeed if we can lock the mddev, which confirms that
7823 * it isn't being stopped right now.
7825 struct mddev
*mddev
= mddev_find(bdev
->bd_dev
);
7831 if (mddev
->gendisk
!= bdev
->bd_disk
) {
7832 /* we are racing with mddev_put which is discarding this
7836 /* Wait until bdev->bd_disk is definitely gone */
7837 if (work_pending(&mddev
->del_work
))
7838 flush_workqueue(md_misc_wq
);
7841 BUG_ON(mddev
!= bdev
->bd_disk
->private_data
);
7843 if ((err
= mutex_lock_interruptible(&mddev
->open_mutex
)))
7846 if (test_bit(MD_CLOSING
, &mddev
->flags
)) {
7847 mutex_unlock(&mddev
->open_mutex
);
7853 atomic_inc(&mddev
->openers
);
7854 mutex_unlock(&mddev
->open_mutex
);
7856 bdev_check_media_change(bdev
);
7863 static void md_release(struct gendisk
*disk
, fmode_t mode
)
7865 struct mddev
*mddev
= disk
->private_data
;
7868 atomic_dec(&mddev
->openers
);
7872 static unsigned int md_check_events(struct gendisk
*disk
, unsigned int clearing
)
7874 struct mddev
*mddev
= disk
->private_data
;
7875 unsigned int ret
= 0;
7878 ret
= DISK_EVENT_MEDIA_CHANGE
;
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
,
7898 static int md_thread(void *arg
)
7900 struct md_thread
*thread
= arg
;
7903 * md_thread is a 'system-thread', it's priority should be very
7904 * high. We avoid resource deadlocks individually in each
7905 * raid personality. (RAID5 does preallocation) We also use RR and
7906 * the very same RT priority as kswapd, thus we will never get
7907 * into a priority inversion deadlock.
7909 * we definitely have to have equal or higher priority than
7910 * bdflush, otherwise bdflush will deadlock if there are too
7911 * many dirty RAID5 blocks.
7914 allow_signal(SIGKILL
);
7915 while (!kthread_should_stop()) {
7917 /* We need to wait INTERRUPTIBLE so that
7918 * we don't add to the load-average.
7919 * That means we need to be sure no signals are
7922 if (signal_pending(current
))
7923 flush_signals(current
);
7925 wait_event_interruptible_timeout
7927 test_bit(THREAD_WAKEUP
, &thread
->flags
)
7928 || kthread_should_stop() || kthread_should_park(),
7931 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
7932 if (kthread_should_park())
7934 if (!kthread_should_stop())
7935 thread
->run(thread
);
7941 void md_wakeup_thread(struct md_thread
*thread
)
7944 pr_debug("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
7945 set_bit(THREAD_WAKEUP
, &thread
->flags
);
7946 wake_up(&thread
->wqueue
);
7949 EXPORT_SYMBOL(md_wakeup_thread
);
7951 struct md_thread
*md_register_thread(void (*run
) (struct md_thread
*),
7952 struct mddev
*mddev
, const char *name
)
7954 struct md_thread
*thread
;
7956 thread
= kzalloc(sizeof(struct md_thread
), GFP_KERNEL
);
7960 init_waitqueue_head(&thread
->wqueue
);
7963 thread
->mddev
= mddev
;
7964 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
7965 thread
->tsk
= kthread_run(md_thread
, thread
,
7967 mdname(thread
->mddev
),
7969 if (IS_ERR(thread
->tsk
)) {
7975 EXPORT_SYMBOL(md_register_thread
);
7977 void md_unregister_thread(struct md_thread
**threadp
)
7979 struct md_thread
*thread
= *threadp
;
7982 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread
->tsk
));
7983 /* Locking ensures that mddev_unlock does not wake_up a
7984 * non-existent thread
7986 spin_lock(&pers_lock
);
7988 spin_unlock(&pers_lock
);
7990 kthread_stop(thread
->tsk
);
7993 EXPORT_SYMBOL(md_unregister_thread
);
7995 void md_error(struct mddev
*mddev
, struct md_rdev
*rdev
)
7997 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
8000 if (!mddev
->pers
|| !mddev
->pers
->error_handler
)
8002 mddev
->pers
->error_handler(mddev
,rdev
);
8003 if (mddev
->degraded
)
8004 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8005 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
8006 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8007 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
8008 md_wakeup_thread(mddev
->thread
);
8009 if (mddev
->event_work
.func
)
8010 queue_work(md_misc_wq
, &mddev
->event_work
);
8011 md_new_event(mddev
);
8013 EXPORT_SYMBOL(md_error
);
8015 /* seq_file implementation /proc/mdstat */
8017 static void status_unused(struct seq_file
*seq
)
8020 struct md_rdev
*rdev
;
8022 seq_printf(seq
, "unused devices: ");
8024 list_for_each_entry(rdev
, &pending_raid_disks
, same_set
) {
8025 char b
[BDEVNAME_SIZE
];
8027 seq_printf(seq
, "%s ",
8028 bdevname(rdev
->bdev
,b
));
8031 seq_printf(seq
, "<none>");
8033 seq_printf(seq
, "\n");
8036 static int status_resync(struct seq_file
*seq
, struct mddev
*mddev
)
8038 sector_t max_sectors
, resync
, res
;
8039 unsigned long dt
, db
= 0;
8040 sector_t rt
, curr_mark_cnt
, resync_mark_cnt
;
8041 int scale
, recovery_active
;
8042 unsigned int per_milli
;
8044 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
8045 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
8046 max_sectors
= mddev
->resync_max_sectors
;
8048 max_sectors
= mddev
->dev_sectors
;
8050 resync
= mddev
->curr_resync
;
8052 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
8053 /* Still cleaning up */
8054 resync
= max_sectors
;
8055 } else if (resync
> max_sectors
)
8056 resync
= max_sectors
;
8058 resync
-= atomic_read(&mddev
->recovery_active
);
8061 if (test_bit(MD_RESYNCING_REMOTE
, &mddev
->recovery
)) {
8062 struct md_rdev
*rdev
;
8064 rdev_for_each(rdev
, mddev
)
8065 if (rdev
->raid_disk
>= 0 &&
8066 !test_bit(Faulty
, &rdev
->flags
) &&
8067 rdev
->recovery_offset
!= MaxSector
&&
8068 rdev
->recovery_offset
) {
8069 seq_printf(seq
, "\trecover=REMOTE");
8072 if (mddev
->reshape_position
!= MaxSector
)
8073 seq_printf(seq
, "\treshape=REMOTE");
8075 seq_printf(seq
, "\tresync=REMOTE");
8078 if (mddev
->recovery_cp
< MaxSector
) {
8079 seq_printf(seq
, "\tresync=PENDING");
8085 seq_printf(seq
, "\tresync=DELAYED");
8089 WARN_ON(max_sectors
== 0);
8090 /* Pick 'scale' such that (resync>>scale)*1000 will fit
8091 * in a sector_t, and (max_sectors>>scale) will fit in a
8092 * u32, as those are the requirements for sector_div.
8093 * Thus 'scale' must be at least 10
8096 if (sizeof(sector_t
) > sizeof(unsigned long)) {
8097 while ( max_sectors
/2 > (1ULL<<(scale
+32)))
8100 res
= (resync
>>scale
)*1000;
8101 sector_div(res
, (u32
)((max_sectors
>>scale
)+1));
8105 int i
, x
= per_milli
/50, y
= 20-x
;
8106 seq_printf(seq
, "[");
8107 for (i
= 0; i
< x
; i
++)
8108 seq_printf(seq
, "=");
8109 seq_printf(seq
, ">");
8110 for (i
= 0; i
< y
; i
++)
8111 seq_printf(seq
, ".");
8112 seq_printf(seq
, "] ");
8114 seq_printf(seq
, " %s =%3u.%u%% (%llu/%llu)",
8115 (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)?
8117 (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)?
8119 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
8120 "resync" : "recovery"))),
8121 per_milli
/10, per_milli
% 10,
8122 (unsigned long long) resync
/2,
8123 (unsigned long long) max_sectors
/2);
8126 * dt: time from mark until now
8127 * db: blocks written from mark until now
8128 * rt: remaining time
8130 * rt is a sector_t, which is always 64bit now. We are keeping
8131 * the original algorithm, but it is not really necessary.
8133 * Original algorithm:
8134 * So we divide before multiply in case it is 32bit and close
8136 * We scale the divisor (db) by 32 to avoid losing precision
8137 * near the end of resync when the number of remaining sectors
8139 * We then divide rt by 32 after multiplying by db to compensate.
8140 * The '+1' avoids division by zero if db is very small.
8142 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
8145 curr_mark_cnt
= mddev
->curr_mark_cnt
;
8146 recovery_active
= atomic_read(&mddev
->recovery_active
);
8147 resync_mark_cnt
= mddev
->resync_mark_cnt
;
8149 if (curr_mark_cnt
>= (recovery_active
+ resync_mark_cnt
))
8150 db
= curr_mark_cnt
- (recovery_active
+ resync_mark_cnt
);
8152 rt
= max_sectors
- resync
; /* number of remaining sectors */
8153 rt
= div64_u64(rt
, db
/32+1);
8157 seq_printf(seq
, " finish=%lu.%lumin", (unsigned long)rt
/ 60,
8158 ((unsigned long)rt
% 60)/6);
8160 seq_printf(seq
, " speed=%ldK/sec", db
/2/dt
);
8164 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
8166 struct list_head
*tmp
;
8168 struct mddev
*mddev
;
8180 spin_lock(&all_mddevs_lock
);
8181 list_for_each(tmp
,&all_mddevs
)
8183 mddev
= list_entry(tmp
, struct mddev
, all_mddevs
);
8185 spin_unlock(&all_mddevs_lock
);
8188 spin_unlock(&all_mddevs_lock
);
8190 return (void*)2;/* tail */
8194 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
8196 struct list_head
*tmp
;
8197 struct mddev
*next_mddev
, *mddev
= v
;
8203 spin_lock(&all_mddevs_lock
);
8205 tmp
= all_mddevs
.next
;
8207 tmp
= mddev
->all_mddevs
.next
;
8208 if (tmp
!= &all_mddevs
)
8209 next_mddev
= mddev_get(list_entry(tmp
,struct mddev
,all_mddevs
));
8211 next_mddev
= (void*)2;
8214 spin_unlock(&all_mddevs_lock
);
8222 static void md_seq_stop(struct seq_file
*seq
, void *v
)
8224 struct mddev
*mddev
= v
;
8226 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
8230 static int md_seq_show(struct seq_file
*seq
, void *v
)
8232 struct mddev
*mddev
= v
;
8234 struct md_rdev
*rdev
;
8236 if (v
== (void*)1) {
8237 struct md_personality
*pers
;
8238 seq_printf(seq
, "Personalities : ");
8239 spin_lock(&pers_lock
);
8240 list_for_each_entry(pers
, &pers_list
, list
)
8241 seq_printf(seq
, "[%s] ", pers
->name
);
8243 spin_unlock(&pers_lock
);
8244 seq_printf(seq
, "\n");
8245 seq
->poll_event
= atomic_read(&md_event_count
);
8248 if (v
== (void*)2) {
8253 spin_lock(&mddev
->lock
);
8254 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
8255 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
8256 mddev
->pers
? "" : "in");
8259 seq_printf(seq
, " (read-only)");
8261 seq_printf(seq
, " (auto-read-only)");
8262 seq_printf(seq
, " %s", mddev
->pers
->name
);
8267 rdev_for_each_rcu(rdev
, mddev
) {
8268 char b
[BDEVNAME_SIZE
];
8269 seq_printf(seq
, " %s[%d]",
8270 bdevname(rdev
->bdev
,b
), rdev
->desc_nr
);
8271 if (test_bit(WriteMostly
, &rdev
->flags
))
8272 seq_printf(seq
, "(W)");
8273 if (test_bit(Journal
, &rdev
->flags
))
8274 seq_printf(seq
, "(J)");
8275 if (test_bit(Faulty
, &rdev
->flags
)) {
8276 seq_printf(seq
, "(F)");
8279 if (rdev
->raid_disk
< 0)
8280 seq_printf(seq
, "(S)"); /* spare */
8281 if (test_bit(Replacement
, &rdev
->flags
))
8282 seq_printf(seq
, "(R)");
8283 sectors
+= rdev
->sectors
;
8287 if (!list_empty(&mddev
->disks
)) {
8289 seq_printf(seq
, "\n %llu blocks",
8290 (unsigned long long)
8291 mddev
->array_sectors
/ 2);
8293 seq_printf(seq
, "\n %llu blocks",
8294 (unsigned long long)sectors
/ 2);
8296 if (mddev
->persistent
) {
8297 if (mddev
->major_version
!= 0 ||
8298 mddev
->minor_version
!= 90) {
8299 seq_printf(seq
," super %d.%d",
8300 mddev
->major_version
,
8301 mddev
->minor_version
);
8303 } else if (mddev
->external
)
8304 seq_printf(seq
, " super external:%s",
8305 mddev
->metadata_type
);
8307 seq_printf(seq
, " super non-persistent");
8310 mddev
->pers
->status(seq
, mddev
);
8311 seq_printf(seq
, "\n ");
8312 if (mddev
->pers
->sync_request
) {
8313 if (status_resync(seq
, mddev
))
8314 seq_printf(seq
, "\n ");
8317 seq_printf(seq
, "\n ");
8319 md_bitmap_status(seq
, mddev
->bitmap
);
8321 seq_printf(seq
, "\n");
8323 spin_unlock(&mddev
->lock
);
8328 static const struct seq_operations md_seq_ops
= {
8329 .start
= md_seq_start
,
8330 .next
= md_seq_next
,
8331 .stop
= md_seq_stop
,
8332 .show
= md_seq_show
,
8335 static int md_seq_open(struct inode
*inode
, struct file
*file
)
8337 struct seq_file
*seq
;
8340 error
= seq_open(file
, &md_seq_ops
);
8344 seq
= file
->private_data
;
8345 seq
->poll_event
= atomic_read(&md_event_count
);
8349 static int md_unloading
;
8350 static __poll_t
mdstat_poll(struct file
*filp
, poll_table
*wait
)
8352 struct seq_file
*seq
= filp
->private_data
;
8356 return EPOLLIN
|EPOLLRDNORM
|EPOLLERR
|EPOLLPRI
;
8357 poll_wait(filp
, &md_event_waiters
, wait
);
8359 /* always allow read */
8360 mask
= EPOLLIN
| EPOLLRDNORM
;
8362 if (seq
->poll_event
!= atomic_read(&md_event_count
))
8363 mask
|= EPOLLERR
| EPOLLPRI
;
8367 static const struct proc_ops mdstat_proc_ops
= {
8368 .proc_open
= md_seq_open
,
8369 .proc_read
= seq_read
,
8370 .proc_lseek
= seq_lseek
,
8371 .proc_release
= seq_release
,
8372 .proc_poll
= mdstat_poll
,
8375 int register_md_personality(struct md_personality
*p
)
8377 pr_debug("md: %s personality registered for level %d\n",
8379 spin_lock(&pers_lock
);
8380 list_add_tail(&p
->list
, &pers_list
);
8381 spin_unlock(&pers_lock
);
8384 EXPORT_SYMBOL(register_md_personality
);
8386 int unregister_md_personality(struct md_personality
*p
)
8388 pr_debug("md: %s personality unregistered\n", p
->name
);
8389 spin_lock(&pers_lock
);
8390 list_del_init(&p
->list
);
8391 spin_unlock(&pers_lock
);
8394 EXPORT_SYMBOL(unregister_md_personality
);
8396 int register_md_cluster_operations(struct md_cluster_operations
*ops
,
8397 struct module
*module
)
8400 spin_lock(&pers_lock
);
8401 if (md_cluster_ops
!= NULL
)
8404 md_cluster_ops
= ops
;
8405 md_cluster_mod
= module
;
8407 spin_unlock(&pers_lock
);
8410 EXPORT_SYMBOL(register_md_cluster_operations
);
8412 int unregister_md_cluster_operations(void)
8414 spin_lock(&pers_lock
);
8415 md_cluster_ops
= NULL
;
8416 spin_unlock(&pers_lock
);
8419 EXPORT_SYMBOL(unregister_md_cluster_operations
);
8421 int md_setup_cluster(struct mddev
*mddev
, int nodes
)
8424 if (!md_cluster_ops
)
8425 request_module("md-cluster");
8426 spin_lock(&pers_lock
);
8427 /* ensure module won't be unloaded */
8428 if (!md_cluster_ops
|| !try_module_get(md_cluster_mod
)) {
8429 pr_warn("can't find md-cluster module or get it's reference.\n");
8430 spin_unlock(&pers_lock
);
8433 spin_unlock(&pers_lock
);
8435 ret
= md_cluster_ops
->join(mddev
, nodes
);
8437 mddev
->safemode_delay
= 0;
8441 void md_cluster_stop(struct mddev
*mddev
)
8443 if (!md_cluster_ops
)
8445 md_cluster_ops
->leave(mddev
);
8446 module_put(md_cluster_mod
);
8449 static int is_mddev_idle(struct mddev
*mddev
, int init
)
8451 struct md_rdev
*rdev
;
8457 rdev_for_each_rcu(rdev
, mddev
) {
8458 struct gendisk
*disk
= rdev
->bdev
->bd_disk
;
8459 curr_events
= (int)part_stat_read_accum(disk
->part0
, sectors
) -
8460 atomic_read(&disk
->sync_io
);
8461 /* sync IO will cause sync_io to increase before the disk_stats
8462 * as sync_io is counted when a request starts, and
8463 * disk_stats is counted when it completes.
8464 * So resync activity will cause curr_events to be smaller than
8465 * when there was no such activity.
8466 * non-sync IO will cause disk_stat to increase without
8467 * increasing sync_io so curr_events will (eventually)
8468 * be larger than it was before. Once it becomes
8469 * substantially larger, the test below will cause
8470 * the array to appear non-idle, and resync will slow
8472 * If there is a lot of outstanding resync activity when
8473 * we set last_event to curr_events, then all that activity
8474 * completing might cause the array to appear non-idle
8475 * and resync will be slowed down even though there might
8476 * not have been non-resync activity. This will only
8477 * happen once though. 'last_events' will soon reflect
8478 * the state where there is little or no outstanding
8479 * resync requests, and further resync activity will
8480 * always make curr_events less than last_events.
8483 if (init
|| curr_events
- rdev
->last_events
> 64) {
8484 rdev
->last_events
= curr_events
;
8492 void md_done_sync(struct mddev
*mddev
, int blocks
, int ok
)
8494 /* another "blocks" (512byte) blocks have been synced */
8495 atomic_sub(blocks
, &mddev
->recovery_active
);
8496 wake_up(&mddev
->recovery_wait
);
8498 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8499 set_bit(MD_RECOVERY_ERROR
, &mddev
->recovery
);
8500 md_wakeup_thread(mddev
->thread
);
8501 // stop recovery, signal do_sync ....
8504 EXPORT_SYMBOL(md_done_sync
);
8506 /* md_write_start(mddev, bi)
8507 * If we need to update some array metadata (e.g. 'active' flag
8508 * in superblock) before writing, schedule a superblock update
8509 * and wait for it to complete.
8510 * A return value of 'false' means that the write wasn't recorded
8511 * and cannot proceed as the array is being suspend.
8513 bool md_write_start(struct mddev
*mddev
, struct bio
*bi
)
8517 if (bio_data_dir(bi
) != WRITE
)
8520 BUG_ON(mddev
->ro
== 1);
8521 if (mddev
->ro
== 2) {
8522 /* need to switch to read/write */
8524 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
8525 md_wakeup_thread(mddev
->thread
);
8526 md_wakeup_thread(mddev
->sync_thread
);
8530 percpu_ref_get(&mddev
->writes_pending
);
8531 smp_mb(); /* Match smp_mb in set_in_sync() */
8532 if (mddev
->safemode
== 1)
8533 mddev
->safemode
= 0;
8534 /* sync_checkers is always 0 when writes_pending is in per-cpu mode */
8535 if (mddev
->in_sync
|| mddev
->sync_checkers
) {
8536 spin_lock(&mddev
->lock
);
8537 if (mddev
->in_sync
) {
8539 set_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
8540 set_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
8541 md_wakeup_thread(mddev
->thread
);
8544 spin_unlock(&mddev
->lock
);
8548 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
8549 if (!mddev
->has_superblocks
)
8551 wait_event(mddev
->sb_wait
,
8552 !test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
) ||
8554 if (test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
)) {
8555 percpu_ref_put(&mddev
->writes_pending
);
8560 EXPORT_SYMBOL(md_write_start
);
8562 /* md_write_inc can only be called when md_write_start() has
8563 * already been called at least once of the current request.
8564 * It increments the counter and is useful when a single request
8565 * is split into several parts. Each part causes an increment and
8566 * so needs a matching md_write_end().
8567 * Unlike md_write_start(), it is safe to call md_write_inc() inside
8568 * a spinlocked region.
8570 void md_write_inc(struct mddev
*mddev
, struct bio
*bi
)
8572 if (bio_data_dir(bi
) != WRITE
)
8574 WARN_ON_ONCE(mddev
->in_sync
|| mddev
->ro
);
8575 percpu_ref_get(&mddev
->writes_pending
);
8577 EXPORT_SYMBOL(md_write_inc
);
8579 void md_write_end(struct mddev
*mddev
)
8581 percpu_ref_put(&mddev
->writes_pending
);
8583 if (mddev
->safemode
== 2)
8584 md_wakeup_thread(mddev
->thread
);
8585 else if (mddev
->safemode_delay
)
8586 /* The roundup() ensures this only performs locking once
8587 * every ->safemode_delay jiffies
8589 mod_timer(&mddev
->safemode_timer
,
8590 roundup(jiffies
, mddev
->safemode_delay
) +
8591 mddev
->safemode_delay
);
8594 EXPORT_SYMBOL(md_write_end
);
8596 /* This is used by raid0 and raid10 */
8597 void md_submit_discard_bio(struct mddev
*mddev
, struct md_rdev
*rdev
,
8598 struct bio
*bio
, sector_t start
, sector_t size
)
8600 struct bio
*discard_bio
= NULL
;
8602 if (__blkdev_issue_discard(rdev
->bdev
, start
, size
, GFP_NOIO
, 0,
8603 &discard_bio
) || !discard_bio
)
8606 bio_chain(discard_bio
, bio
);
8607 bio_clone_blkg_association(discard_bio
, bio
);
8609 trace_block_bio_remap(discard_bio
,
8610 disk_devt(mddev
->gendisk
),
8611 bio
->bi_iter
.bi_sector
);
8612 submit_bio_noacct(discard_bio
);
8614 EXPORT_SYMBOL_GPL(md_submit_discard_bio
);
8616 /* md_allow_write(mddev)
8617 * Calling this ensures that the array is marked 'active' so that writes
8618 * may proceed without blocking. It is important to call this before
8619 * attempting a GFP_KERNEL allocation while holding the mddev lock.
8620 * Must be called with mddev_lock held.
8622 void md_allow_write(struct mddev
*mddev
)
8628 if (!mddev
->pers
->sync_request
)
8631 spin_lock(&mddev
->lock
);
8632 if (mddev
->in_sync
) {
8634 set_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
8635 set_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
8636 if (mddev
->safemode_delay
&&
8637 mddev
->safemode
== 0)
8638 mddev
->safemode
= 1;
8639 spin_unlock(&mddev
->lock
);
8640 md_update_sb(mddev
, 0);
8641 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
8642 /* wait for the dirty state to be recorded in the metadata */
8643 wait_event(mddev
->sb_wait
,
8644 !test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
));
8646 spin_unlock(&mddev
->lock
);
8648 EXPORT_SYMBOL_GPL(md_allow_write
);
8650 #define SYNC_MARKS 10
8651 #define SYNC_MARK_STEP (3*HZ)
8652 #define UPDATE_FREQUENCY (5*60*HZ)
8653 void md_do_sync(struct md_thread
*thread
)
8655 struct mddev
*mddev
= thread
->mddev
;
8656 struct mddev
*mddev2
;
8657 unsigned int currspeed
= 0, window
;
8658 sector_t max_sectors
,j
, io_sectors
, recovery_done
;
8659 unsigned long mark
[SYNC_MARKS
];
8660 unsigned long update_time
;
8661 sector_t mark_cnt
[SYNC_MARKS
];
8663 struct list_head
*tmp
;
8664 sector_t last_check
;
8666 struct md_rdev
*rdev
;
8667 char *desc
, *action
= NULL
;
8668 struct blk_plug plug
;
8671 /* just incase thread restarts... */
8672 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
8673 test_bit(MD_RECOVERY_WAIT
, &mddev
->recovery
))
8675 if (mddev
->ro
) {/* never try to sync a read-only array */
8676 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8680 if (mddev_is_clustered(mddev
)) {
8681 ret
= md_cluster_ops
->resync_start(mddev
);
8685 set_bit(MD_CLUSTER_RESYNC_LOCKED
, &mddev
->flags
);
8686 if (!(test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
8687 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) ||
8688 test_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
))
8689 && ((unsigned long long)mddev
->curr_resync_completed
8690 < (unsigned long long)mddev
->resync_max_sectors
))
8694 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
8695 if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)) {
8696 desc
= "data-check";
8698 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
8699 desc
= "requested-resync";
8703 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
8708 mddev
->last_sync_action
= action
?: desc
;
8710 /* we overload curr_resync somewhat here.
8711 * 0 == not engaged in resync at all
8712 * 2 == checking that there is no conflict with another sync
8713 * 1 == like 2, but have yielded to allow conflicting resync to
8715 * other == active in resync - this many blocks
8717 * Before starting a resync we must have set curr_resync to
8718 * 2, and then checked that every "conflicting" array has curr_resync
8719 * less than ours. When we find one that is the same or higher
8720 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
8721 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
8722 * This will mean we have to start checking from the beginning again.
8727 int mddev2_minor
= -1;
8728 mddev
->curr_resync
= 2;
8731 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
8733 for_each_mddev(mddev2
, tmp
) {
8734 if (mddev2
== mddev
)
8736 if (!mddev
->parallel_resync
8737 && mddev2
->curr_resync
8738 && match_mddev_units(mddev
, mddev2
)) {
8740 if (mddev
< mddev2
&& mddev
->curr_resync
== 2) {
8741 /* arbitrarily yield */
8742 mddev
->curr_resync
= 1;
8743 wake_up(&resync_wait
);
8745 if (mddev
> mddev2
&& mddev
->curr_resync
== 1)
8746 /* no need to wait here, we can wait the next
8747 * time 'round when curr_resync == 2
8750 /* We need to wait 'interruptible' so as not to
8751 * contribute to the load average, and not to
8752 * be caught by 'softlockup'
8754 prepare_to_wait(&resync_wait
, &wq
, TASK_INTERRUPTIBLE
);
8755 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
8756 mddev2
->curr_resync
>= mddev
->curr_resync
) {
8757 if (mddev2_minor
!= mddev2
->md_minor
) {
8758 mddev2_minor
= mddev2
->md_minor
;
8759 pr_info("md: delaying %s of %s until %s has finished (they share one or more physical units)\n",
8760 desc
, mdname(mddev
),
8764 if (signal_pending(current
))
8765 flush_signals(current
);
8767 finish_wait(&resync_wait
, &wq
);
8770 finish_wait(&resync_wait
, &wq
);
8773 } while (mddev
->curr_resync
< 2);
8776 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
8777 /* resync follows the size requested by the personality,
8778 * which defaults to physical size, but can be virtual size
8780 max_sectors
= mddev
->resync_max_sectors
;
8781 atomic64_set(&mddev
->resync_mismatches
, 0);
8782 /* we don't use the checkpoint if there's a bitmap */
8783 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
8784 j
= mddev
->resync_min
;
8785 else if (!mddev
->bitmap
)
8786 j
= mddev
->recovery_cp
;
8788 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)) {
8789 max_sectors
= mddev
->resync_max_sectors
;
8791 * If the original node aborts reshaping then we continue the
8792 * reshaping, so set j again to avoid restart reshape from the
8795 if (mddev_is_clustered(mddev
) &&
8796 mddev
->reshape_position
!= MaxSector
)
8797 j
= mddev
->reshape_position
;
8799 /* recovery follows the physical size of devices */
8800 max_sectors
= mddev
->dev_sectors
;
8803 rdev_for_each_rcu(rdev
, mddev
)
8804 if (rdev
->raid_disk
>= 0 &&
8805 !test_bit(Journal
, &rdev
->flags
) &&
8806 !test_bit(Faulty
, &rdev
->flags
) &&
8807 !test_bit(In_sync
, &rdev
->flags
) &&
8808 rdev
->recovery_offset
< j
)
8809 j
= rdev
->recovery_offset
;
8812 /* If there is a bitmap, we need to make sure all
8813 * writes that started before we added a spare
8814 * complete before we start doing a recovery.
8815 * Otherwise the write might complete and (via
8816 * bitmap_endwrite) set a bit in the bitmap after the
8817 * recovery has checked that bit and skipped that
8820 if (mddev
->bitmap
) {
8821 mddev
->pers
->quiesce(mddev
, 1);
8822 mddev
->pers
->quiesce(mddev
, 0);
8826 pr_info("md: %s of RAID array %s\n", desc
, mdname(mddev
));
8827 pr_debug("md: minimum _guaranteed_ speed: %d KB/sec/disk.\n", speed_min(mddev
));
8828 pr_debug("md: using maximum available idle IO bandwidth (but not more than %d KB/sec) for %s.\n",
8829 speed_max(mddev
), desc
);
8831 is_mddev_idle(mddev
, 1); /* this initializes IO event counters */
8834 for (m
= 0; m
< SYNC_MARKS
; m
++) {
8836 mark_cnt
[m
] = io_sectors
;
8839 mddev
->resync_mark
= mark
[last_mark
];
8840 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
8843 * Tune reconstruction:
8845 window
= 32 * (PAGE_SIZE
/ 512);
8846 pr_debug("md: using %dk window, over a total of %lluk.\n",
8847 window
/2, (unsigned long long)max_sectors
/2);
8849 atomic_set(&mddev
->recovery_active
, 0);
8853 pr_debug("md: resuming %s of %s from checkpoint.\n",
8854 desc
, mdname(mddev
));
8855 mddev
->curr_resync
= j
;
8857 mddev
->curr_resync
= 3; /* no longer delayed */
8858 mddev
->curr_resync_completed
= j
;
8859 sysfs_notify_dirent_safe(mddev
->sysfs_completed
);
8860 md_new_event(mddev
);
8861 update_time
= jiffies
;
8863 blk_start_plug(&plug
);
8864 while (j
< max_sectors
) {
8869 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
8870 ((mddev
->curr_resync
> mddev
->curr_resync_completed
&&
8871 (mddev
->curr_resync
- mddev
->curr_resync_completed
)
8872 > (max_sectors
>> 4)) ||
8873 time_after_eq(jiffies
, update_time
+ UPDATE_FREQUENCY
) ||
8874 (j
- mddev
->curr_resync_completed
)*2
8875 >= mddev
->resync_max
- mddev
->curr_resync_completed
||
8876 mddev
->curr_resync_completed
> mddev
->resync_max
8878 /* time to update curr_resync_completed */
8879 wait_event(mddev
->recovery_wait
,
8880 atomic_read(&mddev
->recovery_active
) == 0);
8881 mddev
->curr_resync_completed
= j
;
8882 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) &&
8883 j
> mddev
->recovery_cp
)
8884 mddev
->recovery_cp
= j
;
8885 update_time
= jiffies
;
8886 set_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
8887 sysfs_notify_dirent_safe(mddev
->sysfs_completed
);
8890 while (j
>= mddev
->resync_max
&&
8891 !test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
8892 /* As this condition is controlled by user-space,
8893 * we can block indefinitely, so use '_interruptible'
8894 * to avoid triggering warnings.
8896 flush_signals(current
); /* just in case */
8897 wait_event_interruptible(mddev
->recovery_wait
,
8898 mddev
->resync_max
> j
8899 || test_bit(MD_RECOVERY_INTR
,
8903 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
8906 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
);
8908 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8912 if (!skipped
) { /* actual IO requested */
8913 io_sectors
+= sectors
;
8914 atomic_add(sectors
, &mddev
->recovery_active
);
8917 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
8921 if (j
> max_sectors
)
8922 /* when skipping, extra large numbers can be returned. */
8925 mddev
->curr_resync
= j
;
8926 mddev
->curr_mark_cnt
= io_sectors
;
8927 if (last_check
== 0)
8928 /* this is the earliest that rebuild will be
8929 * visible in /proc/mdstat
8931 md_new_event(mddev
);
8933 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
8936 last_check
= io_sectors
;
8938 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
8940 int next
= (last_mark
+1) % SYNC_MARKS
;
8942 mddev
->resync_mark
= mark
[next
];
8943 mddev
->resync_mark_cnt
= mark_cnt
[next
];
8944 mark
[next
] = jiffies
;
8945 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
8949 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
8953 * this loop exits only if either when we are slower than
8954 * the 'hard' speed limit, or the system was IO-idle for
8956 * the system might be non-idle CPU-wise, but we only care
8957 * about not overloading the IO subsystem. (things like an
8958 * e2fsck being done on the RAID array should execute fast)
8962 recovery_done
= io_sectors
- atomic_read(&mddev
->recovery_active
);
8963 currspeed
= ((unsigned long)(recovery_done
- mddev
->resync_mark_cnt
))/2
8964 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
8966 if (currspeed
> speed_min(mddev
)) {
8967 if (currspeed
> speed_max(mddev
)) {
8971 if (!is_mddev_idle(mddev
, 0)) {
8973 * Give other IO more of a chance.
8974 * The faster the devices, the less we wait.
8976 wait_event(mddev
->recovery_wait
,
8977 !atomic_read(&mddev
->recovery_active
));
8981 pr_info("md: %s: %s %s.\n",mdname(mddev
), desc
,
8982 test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)
8983 ? "interrupted" : "done");
8985 * this also signals 'finished resyncing' to md_stop
8987 blk_finish_plug(&plug
);
8988 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
8990 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
8991 !test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
8992 mddev
->curr_resync
> 3) {
8993 mddev
->curr_resync_completed
= mddev
->curr_resync
;
8994 sysfs_notify_dirent_safe(mddev
->sysfs_completed
);
8996 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
);
8998 if (!test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
) &&
8999 mddev
->curr_resync
> 3) {
9000 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
9001 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
9002 if (mddev
->curr_resync
>= mddev
->recovery_cp
) {
9003 pr_debug("md: checkpointing %s of %s.\n",
9004 desc
, mdname(mddev
));
9005 if (test_bit(MD_RECOVERY_ERROR
,
9007 mddev
->recovery_cp
=
9008 mddev
->curr_resync_completed
;
9010 mddev
->recovery_cp
=
9014 mddev
->recovery_cp
= MaxSector
;
9016 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
9017 mddev
->curr_resync
= MaxSector
;
9018 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
9019 test_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
)) {
9021 rdev_for_each_rcu(rdev
, mddev
)
9022 if (rdev
->raid_disk
>= 0 &&
9023 mddev
->delta_disks
>= 0 &&
9024 !test_bit(Journal
, &rdev
->flags
) &&
9025 !test_bit(Faulty
, &rdev
->flags
) &&
9026 !test_bit(In_sync
, &rdev
->flags
) &&
9027 rdev
->recovery_offset
< mddev
->curr_resync
)
9028 rdev
->recovery_offset
= mddev
->curr_resync
;
9034 /* set CHANGE_PENDING here since maybe another update is needed,
9035 * so other nodes are informed. It should be harmless for normal
9037 set_mask_bits(&mddev
->sb_flags
, 0,
9038 BIT(MD_SB_CHANGE_PENDING
) | BIT(MD_SB_CHANGE_DEVS
));
9040 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
9041 !test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
9042 mddev
->delta_disks
> 0 &&
9043 mddev
->pers
->finish_reshape
&&
9044 mddev
->pers
->size
&&
9046 mddev_lock_nointr(mddev
);
9047 md_set_array_sectors(mddev
, mddev
->pers
->size(mddev
, 0, 0));
9048 mddev_unlock(mddev
);
9049 if (!mddev_is_clustered(mddev
))
9050 set_capacity_and_notify(mddev
->gendisk
,
9051 mddev
->array_sectors
);
9054 spin_lock(&mddev
->lock
);
9055 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
9056 /* We completed so min/max setting can be forgotten if used. */
9057 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
9058 mddev
->resync_min
= 0;
9059 mddev
->resync_max
= MaxSector
;
9060 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
9061 mddev
->resync_min
= mddev
->curr_resync_completed
;
9062 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
9063 mddev
->curr_resync
= 0;
9064 spin_unlock(&mddev
->lock
);
9066 wake_up(&resync_wait
);
9067 md_wakeup_thread(mddev
->thread
);
9070 EXPORT_SYMBOL_GPL(md_do_sync
);
9072 static int remove_and_add_spares(struct mddev
*mddev
,
9073 struct md_rdev
*this)
9075 struct md_rdev
*rdev
;
9078 bool remove_some
= false;
9080 if (this && test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
9081 /* Mustn't remove devices when resync thread is running */
9084 rdev_for_each(rdev
, mddev
) {
9085 if ((this == NULL
|| rdev
== this) &&
9086 rdev
->raid_disk
>= 0 &&
9087 !test_bit(Blocked
, &rdev
->flags
) &&
9088 test_bit(Faulty
, &rdev
->flags
) &&
9089 atomic_read(&rdev
->nr_pending
)==0) {
9090 /* Faulty non-Blocked devices with nr_pending == 0
9091 * never get nr_pending incremented,
9092 * never get Faulty cleared, and never get Blocked set.
9093 * So we can synchronize_rcu now rather than once per device
9096 set_bit(RemoveSynchronized
, &rdev
->flags
);
9102 rdev_for_each(rdev
, mddev
) {
9103 if ((this == NULL
|| rdev
== this) &&
9104 rdev
->raid_disk
>= 0 &&
9105 !test_bit(Blocked
, &rdev
->flags
) &&
9106 ((test_bit(RemoveSynchronized
, &rdev
->flags
) ||
9107 (!test_bit(In_sync
, &rdev
->flags
) &&
9108 !test_bit(Journal
, &rdev
->flags
))) &&
9109 atomic_read(&rdev
->nr_pending
)==0)) {
9110 if (mddev
->pers
->hot_remove_disk(
9111 mddev
, rdev
) == 0) {
9112 sysfs_unlink_rdev(mddev
, rdev
);
9113 rdev
->saved_raid_disk
= rdev
->raid_disk
;
9114 rdev
->raid_disk
= -1;
9118 if (remove_some
&& test_bit(RemoveSynchronized
, &rdev
->flags
))
9119 clear_bit(RemoveSynchronized
, &rdev
->flags
);
9122 if (removed
&& mddev
->kobj
.sd
)
9123 sysfs_notify_dirent_safe(mddev
->sysfs_degraded
);
9125 if (this && removed
)
9128 rdev_for_each(rdev
, mddev
) {
9129 if (this && this != rdev
)
9131 if (test_bit(Candidate
, &rdev
->flags
))
9133 if (rdev
->raid_disk
>= 0 &&
9134 !test_bit(In_sync
, &rdev
->flags
) &&
9135 !test_bit(Journal
, &rdev
->flags
) &&
9136 !test_bit(Faulty
, &rdev
->flags
))
9138 if (rdev
->raid_disk
>= 0)
9140 if (test_bit(Faulty
, &rdev
->flags
))
9142 if (!test_bit(Journal
, &rdev
->flags
)) {
9144 ! (rdev
->saved_raid_disk
>= 0 &&
9145 !test_bit(Bitmap_sync
, &rdev
->flags
)))
9148 rdev
->recovery_offset
= 0;
9150 if (mddev
->pers
->hot_add_disk(mddev
, rdev
) == 0) {
9151 /* failure here is OK */
9152 sysfs_link_rdev(mddev
, rdev
);
9153 if (!test_bit(Journal
, &rdev
->flags
))
9155 md_new_event(mddev
);
9156 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
9161 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
9165 static void md_start_sync(struct work_struct
*ws
)
9167 struct mddev
*mddev
= container_of(ws
, struct mddev
, del_work
);
9169 mddev
->sync_thread
= md_register_thread(md_do_sync
,
9172 if (!mddev
->sync_thread
) {
9173 pr_warn("%s: could not start resync thread...\n",
9175 /* leave the spares where they are, it shouldn't hurt */
9176 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
9177 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
9178 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
9179 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
9180 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
9181 wake_up(&resync_wait
);
9182 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
9184 if (mddev
->sysfs_action
)
9185 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
9187 md_wakeup_thread(mddev
->sync_thread
);
9188 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
9189 md_new_event(mddev
);
9193 * This routine is regularly called by all per-raid-array threads to
9194 * deal with generic issues like resync and super-block update.
9195 * Raid personalities that don't have a thread (linear/raid0) do not
9196 * need this as they never do any recovery or update the superblock.
9198 * It does not do any resync itself, but rather "forks" off other threads
9199 * to do that as needed.
9200 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
9201 * "->recovery" and create a thread at ->sync_thread.
9202 * When the thread finishes it sets MD_RECOVERY_DONE
9203 * and wakeups up this thread which will reap the thread and finish up.
9204 * This thread also removes any faulty devices (with nr_pending == 0).
9206 * The overall approach is:
9207 * 1/ if the superblock needs updating, update it.
9208 * 2/ If a recovery thread is running, don't do anything else.
9209 * 3/ If recovery has finished, clean up, possibly marking spares active.
9210 * 4/ If there are any faulty devices, remove them.
9211 * 5/ If array is degraded, try to add spares devices
9212 * 6/ If array has spares or is not in-sync, start a resync thread.
9214 void md_check_recovery(struct mddev
*mddev
)
9216 if (test_bit(MD_ALLOW_SB_UPDATE
, &mddev
->flags
) && mddev
->sb_flags
) {
9217 /* Write superblock - thread that called mddev_suspend()
9218 * holds reconfig_mutex for us.
9220 set_bit(MD_UPDATING_SB
, &mddev
->flags
);
9221 smp_mb__after_atomic();
9222 if (test_bit(MD_ALLOW_SB_UPDATE
, &mddev
->flags
))
9223 md_update_sb(mddev
, 0);
9224 clear_bit_unlock(MD_UPDATING_SB
, &mddev
->flags
);
9225 wake_up(&mddev
->sb_wait
);
9228 if (mddev
->suspended
)
9232 md_bitmap_daemon_work(mddev
);
9234 if (signal_pending(current
)) {
9235 if (mddev
->pers
->sync_request
&& !mddev
->external
) {
9236 pr_debug("md: %s in immediate safe mode\n",
9238 mddev
->safemode
= 2;
9240 flush_signals(current
);
9243 if (mddev
->ro
&& !test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
9246 (mddev
->sb_flags
& ~ (1<<MD_SB_CHANGE_PENDING
)) ||
9247 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
9248 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
9249 (mddev
->external
== 0 && mddev
->safemode
== 1) ||
9250 (mddev
->safemode
== 2
9251 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
9255 if (mddev_trylock(mddev
)) {
9257 bool try_set_sync
= mddev
->safemode
!= 0;
9259 if (!mddev
->external
&& mddev
->safemode
== 1)
9260 mddev
->safemode
= 0;
9263 struct md_rdev
*rdev
;
9264 if (!mddev
->external
&& mddev
->in_sync
)
9265 /* 'Blocked' flag not needed as failed devices
9266 * will be recorded if array switched to read/write.
9267 * Leaving it set will prevent the device
9268 * from being removed.
9270 rdev_for_each(rdev
, mddev
)
9271 clear_bit(Blocked
, &rdev
->flags
);
9272 /* On a read-only array we can:
9273 * - remove failed devices
9274 * - add already-in_sync devices if the array itself
9276 * As we only add devices that are already in-sync,
9277 * we can activate the spares immediately.
9279 remove_and_add_spares(mddev
, NULL
);
9280 /* There is no thread, but we need to call
9281 * ->spare_active and clear saved_raid_disk
9283 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
9284 md_reap_sync_thread(mddev
);
9285 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
9286 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
9287 clear_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
9291 if (mddev_is_clustered(mddev
)) {
9292 struct md_rdev
*rdev
, *tmp
;
9293 /* kick the device if another node issued a
9296 rdev_for_each_safe(rdev
, tmp
, mddev
) {
9297 if (test_and_clear_bit(ClusterRemove
, &rdev
->flags
) &&
9298 rdev
->raid_disk
< 0)
9299 md_kick_rdev_from_array(rdev
);
9303 if (try_set_sync
&& !mddev
->external
&& !mddev
->in_sync
) {
9304 spin_lock(&mddev
->lock
);
9306 spin_unlock(&mddev
->lock
);
9309 if (mddev
->sb_flags
)
9310 md_update_sb(mddev
, 0);
9312 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
9313 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
9314 /* resync/recovery still happening */
9315 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
9318 if (mddev
->sync_thread
) {
9319 md_reap_sync_thread(mddev
);
9322 /* Set RUNNING before clearing NEEDED to avoid
9323 * any transients in the value of "sync_action".
9325 mddev
->curr_resync_completed
= 0;
9326 spin_lock(&mddev
->lock
);
9327 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
9328 spin_unlock(&mddev
->lock
);
9329 /* Clear some bits that don't mean anything, but
9332 clear_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
9333 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
9335 if (!test_and_clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
9336 test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
9338 /* no recovery is running.
9339 * remove any failed drives, then
9340 * add spares if possible.
9341 * Spares are also removed and re-added, to allow
9342 * the personality to fail the re-add.
9345 if (mddev
->reshape_position
!= MaxSector
) {
9346 if (mddev
->pers
->check_reshape
== NULL
||
9347 mddev
->pers
->check_reshape(mddev
) != 0)
9348 /* Cannot proceed */
9350 set_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
9351 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
9352 } else if ((spares
= remove_and_add_spares(mddev
, NULL
))) {
9353 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
9354 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
9355 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
9356 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
9357 } else if (mddev
->recovery_cp
< MaxSector
) {
9358 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
9359 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
9360 } else if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
9361 /* nothing to be done ... */
9364 if (mddev
->pers
->sync_request
) {
9366 /* We are adding a device or devices to an array
9367 * which has the bitmap stored on all devices.
9368 * So make sure all bitmap pages get written
9370 md_bitmap_write_all(mddev
->bitmap
);
9372 INIT_WORK(&mddev
->del_work
, md_start_sync
);
9373 queue_work(md_misc_wq
, &mddev
->del_work
);
9377 if (!mddev
->sync_thread
) {
9378 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
9379 wake_up(&resync_wait
);
9380 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
9382 if (mddev
->sysfs_action
)
9383 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
9386 wake_up(&mddev
->sb_wait
);
9387 mddev_unlock(mddev
);
9390 EXPORT_SYMBOL(md_check_recovery
);
9392 void md_reap_sync_thread(struct mddev
*mddev
)
9394 struct md_rdev
*rdev
;
9395 sector_t old_dev_sectors
= mddev
->dev_sectors
;
9396 bool is_reshaped
= false;
9398 /* resync has finished, collect result */
9399 md_unregister_thread(&mddev
->sync_thread
);
9400 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
9401 !test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
) &&
9402 mddev
->degraded
!= mddev
->raid_disks
) {
9404 /* activate any spares */
9405 if (mddev
->pers
->spare_active(mddev
)) {
9406 sysfs_notify_dirent_safe(mddev
->sysfs_degraded
);
9407 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
9410 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
9411 mddev
->pers
->finish_reshape
) {
9412 mddev
->pers
->finish_reshape(mddev
);
9413 if (mddev_is_clustered(mddev
))
9417 /* If array is no-longer degraded, then any saved_raid_disk
9418 * information must be scrapped.
9420 if (!mddev
->degraded
)
9421 rdev_for_each(rdev
, mddev
)
9422 rdev
->saved_raid_disk
= -1;
9424 md_update_sb(mddev
, 1);
9425 /* MD_SB_CHANGE_PENDING should be cleared by md_update_sb, so we can
9426 * call resync_finish here if MD_CLUSTER_RESYNC_LOCKED is set by
9428 if (test_and_clear_bit(MD_CLUSTER_RESYNC_LOCKED
, &mddev
->flags
))
9429 md_cluster_ops
->resync_finish(mddev
);
9430 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
9431 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
9432 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
9433 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
9434 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
9435 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
9437 * We call md_cluster_ops->update_size here because sync_size could
9438 * be changed by md_update_sb, and MD_RECOVERY_RESHAPE is cleared,
9439 * so it is time to update size across cluster.
9441 if (mddev_is_clustered(mddev
) && is_reshaped
9442 && !test_bit(MD_CLOSING
, &mddev
->flags
))
9443 md_cluster_ops
->update_size(mddev
, old_dev_sectors
);
9444 wake_up(&resync_wait
);
9445 /* flag recovery needed just to double check */
9446 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
9447 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
9448 md_new_event(mddev
);
9449 if (mddev
->event_work
.func
)
9450 queue_work(md_misc_wq
, &mddev
->event_work
);
9452 EXPORT_SYMBOL(md_reap_sync_thread
);
9454 void md_wait_for_blocked_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
9456 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
9457 wait_event_timeout(rdev
->blocked_wait
,
9458 !test_bit(Blocked
, &rdev
->flags
) &&
9459 !test_bit(BlockedBadBlocks
, &rdev
->flags
),
9460 msecs_to_jiffies(5000));
9461 rdev_dec_pending(rdev
, mddev
);
9463 EXPORT_SYMBOL(md_wait_for_blocked_rdev
);
9465 void md_finish_reshape(struct mddev
*mddev
)
9467 /* called be personality module when reshape completes. */
9468 struct md_rdev
*rdev
;
9470 rdev_for_each(rdev
, mddev
) {
9471 if (rdev
->data_offset
> rdev
->new_data_offset
)
9472 rdev
->sectors
+= rdev
->data_offset
- rdev
->new_data_offset
;
9474 rdev
->sectors
-= rdev
->new_data_offset
- rdev
->data_offset
;
9475 rdev
->data_offset
= rdev
->new_data_offset
;
9478 EXPORT_SYMBOL(md_finish_reshape
);
9480 /* Bad block management */
9482 /* Returns 1 on success, 0 on failure */
9483 int rdev_set_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
9486 struct mddev
*mddev
= rdev
->mddev
;
9489 s
+= rdev
->new_data_offset
;
9491 s
+= rdev
->data_offset
;
9492 rv
= badblocks_set(&rdev
->badblocks
, s
, sectors
, 0);
9494 /* Make sure they get written out promptly */
9495 if (test_bit(ExternalBbl
, &rdev
->flags
))
9496 sysfs_notify_dirent_safe(rdev
->sysfs_unack_badblocks
);
9497 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
9498 set_mask_bits(&mddev
->sb_flags
, 0,
9499 BIT(MD_SB_CHANGE_CLEAN
) | BIT(MD_SB_CHANGE_PENDING
));
9500 md_wakeup_thread(rdev
->mddev
->thread
);
9505 EXPORT_SYMBOL_GPL(rdev_set_badblocks
);
9507 int rdev_clear_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
9512 s
+= rdev
->new_data_offset
;
9514 s
+= rdev
->data_offset
;
9515 rv
= badblocks_clear(&rdev
->badblocks
, s
, sectors
);
9516 if ((rv
== 0) && test_bit(ExternalBbl
, &rdev
->flags
))
9517 sysfs_notify_dirent_safe(rdev
->sysfs_badblocks
);
9520 EXPORT_SYMBOL_GPL(rdev_clear_badblocks
);
9522 static int md_notify_reboot(struct notifier_block
*this,
9523 unsigned long code
, void *x
)
9525 struct list_head
*tmp
;
9526 struct mddev
*mddev
;
9529 for_each_mddev(mddev
, tmp
) {
9530 if (mddev_trylock(mddev
)) {
9532 __md_stop_writes(mddev
);
9533 if (mddev
->persistent
)
9534 mddev
->safemode
= 2;
9535 mddev_unlock(mddev
);
9540 * certain more exotic SCSI devices are known to be
9541 * volatile wrt too early system reboots. While the
9542 * right place to handle this issue is the given
9543 * driver, we do want to have a safe RAID driver ...
9551 static struct notifier_block md_notifier
= {
9552 .notifier_call
= md_notify_reboot
,
9554 .priority
= INT_MAX
, /* before any real devices */
9557 static void md_geninit(void)
9559 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
9561 proc_create("mdstat", S_IRUGO
, NULL
, &mdstat_proc_ops
);
9564 static int __init
md_init(void)
9568 md_wq
= alloc_workqueue("md", WQ_MEM_RECLAIM
, 0);
9572 md_misc_wq
= alloc_workqueue("md_misc", 0, 0);
9576 md_rdev_misc_wq
= alloc_workqueue("md_rdev_misc", 0, 0);
9577 if (!md_rdev_misc_wq
)
9578 goto err_rdev_misc_wq
;
9580 ret
= __register_blkdev(MD_MAJOR
, "md", md_probe
);
9584 ret
= __register_blkdev(0, "mdp", md_probe
);
9589 register_reboot_notifier(&md_notifier
);
9590 raid_table_header
= register_sysctl_table(raid_root_table
);
9596 unregister_blkdev(MD_MAJOR
, "md");
9598 destroy_workqueue(md_rdev_misc_wq
);
9600 destroy_workqueue(md_misc_wq
);
9602 destroy_workqueue(md_wq
);
9607 static void check_sb_changes(struct mddev
*mddev
, struct md_rdev
*rdev
)
9609 struct mdp_superblock_1
*sb
= page_address(rdev
->sb_page
);
9610 struct md_rdev
*rdev2
, *tmp
;
9612 char b
[BDEVNAME_SIZE
];
9615 * If size is changed in another node then we need to
9616 * do resize as well.
9618 if (mddev
->dev_sectors
!= le64_to_cpu(sb
->size
)) {
9619 ret
= mddev
->pers
->resize(mddev
, le64_to_cpu(sb
->size
));
9621 pr_info("md-cluster: resize failed\n");
9623 md_bitmap_update_sb(mddev
->bitmap
);
9626 /* Check for change of roles in the active devices */
9627 rdev_for_each_safe(rdev2
, tmp
, mddev
) {
9628 if (test_bit(Faulty
, &rdev2
->flags
))
9631 /* Check if the roles changed */
9632 role
= le16_to_cpu(sb
->dev_roles
[rdev2
->desc_nr
]);
9634 if (test_bit(Candidate
, &rdev2
->flags
)) {
9635 if (role
== 0xfffe) {
9636 pr_info("md: Removing Candidate device %s because add failed\n", bdevname(rdev2
->bdev
,b
));
9637 md_kick_rdev_from_array(rdev2
);
9641 clear_bit(Candidate
, &rdev2
->flags
);
9644 if (role
!= rdev2
->raid_disk
) {
9646 * got activated except reshape is happening.
9648 if (rdev2
->raid_disk
== -1 && role
!= 0xffff &&
9649 !(le32_to_cpu(sb
->feature_map
) &
9650 MD_FEATURE_RESHAPE_ACTIVE
)) {
9651 rdev2
->saved_raid_disk
= role
;
9652 ret
= remove_and_add_spares(mddev
, rdev2
);
9653 pr_info("Activated spare: %s\n",
9654 bdevname(rdev2
->bdev
,b
));
9655 /* wakeup mddev->thread here, so array could
9656 * perform resync with the new activated disk */
9657 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
9658 md_wakeup_thread(mddev
->thread
);
9661 * We just want to do the minimum to mark the disk
9662 * as faulty. The recovery is performed by the
9663 * one who initiated the error.
9665 if ((role
== 0xfffe) || (role
== 0xfffd)) {
9666 md_error(mddev
, rdev2
);
9667 clear_bit(Blocked
, &rdev2
->flags
);
9672 if (mddev
->raid_disks
!= le32_to_cpu(sb
->raid_disks
)) {
9673 ret
= update_raid_disks(mddev
, le32_to_cpu(sb
->raid_disks
));
9675 pr_warn("md: updating array disks failed. %d\n", ret
);
9679 * Since mddev->delta_disks has already updated in update_raid_disks,
9680 * so it is time to check reshape.
9682 if (test_bit(MD_RESYNCING_REMOTE
, &mddev
->recovery
) &&
9683 (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
9685 * reshape is happening in the remote node, we need to
9686 * update reshape_position and call start_reshape.
9688 mddev
->reshape_position
= le64_to_cpu(sb
->reshape_position
);
9689 if (mddev
->pers
->update_reshape_pos
)
9690 mddev
->pers
->update_reshape_pos(mddev
);
9691 if (mddev
->pers
->start_reshape
)
9692 mddev
->pers
->start_reshape(mddev
);
9693 } else if (test_bit(MD_RESYNCING_REMOTE
, &mddev
->recovery
) &&
9694 mddev
->reshape_position
!= MaxSector
&&
9695 !(le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
9696 /* reshape is just done in another node. */
9697 mddev
->reshape_position
= MaxSector
;
9698 if (mddev
->pers
->update_reshape_pos
)
9699 mddev
->pers
->update_reshape_pos(mddev
);
9702 /* Finally set the event to be up to date */
9703 mddev
->events
= le64_to_cpu(sb
->events
);
9706 static int read_rdev(struct mddev
*mddev
, struct md_rdev
*rdev
)
9709 struct page
*swapout
= rdev
->sb_page
;
9710 struct mdp_superblock_1
*sb
;
9712 /* Store the sb page of the rdev in the swapout temporary
9713 * variable in case we err in the future
9715 rdev
->sb_page
= NULL
;
9716 err
= alloc_disk_sb(rdev
);
9718 ClearPageUptodate(rdev
->sb_page
);
9719 rdev
->sb_loaded
= 0;
9720 err
= super_types
[mddev
->major_version
].
9721 load_super(rdev
, NULL
, mddev
->minor_version
);
9724 pr_warn("%s: %d Could not reload rdev(%d) err: %d. Restoring old values\n",
9725 __func__
, __LINE__
, rdev
->desc_nr
, err
);
9727 put_page(rdev
->sb_page
);
9728 rdev
->sb_page
= swapout
;
9729 rdev
->sb_loaded
= 1;
9733 sb
= page_address(rdev
->sb_page
);
9734 /* Read the offset unconditionally, even if MD_FEATURE_RECOVERY_OFFSET
9738 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RECOVERY_OFFSET
))
9739 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
9741 /* The other node finished recovery, call spare_active to set
9742 * device In_sync and mddev->degraded
9744 if (rdev
->recovery_offset
== MaxSector
&&
9745 !test_bit(In_sync
, &rdev
->flags
) &&
9746 mddev
->pers
->spare_active(mddev
))
9747 sysfs_notify_dirent_safe(mddev
->sysfs_degraded
);
9753 void md_reload_sb(struct mddev
*mddev
, int nr
)
9755 struct md_rdev
*rdev
;
9759 rdev_for_each_rcu(rdev
, mddev
) {
9760 if (rdev
->desc_nr
== nr
)
9764 if (!rdev
|| rdev
->desc_nr
!= nr
) {
9765 pr_warn("%s: %d Could not find rdev with nr %d\n", __func__
, __LINE__
, nr
);
9769 err
= read_rdev(mddev
, rdev
);
9773 check_sb_changes(mddev
, rdev
);
9775 /* Read all rdev's to update recovery_offset */
9776 rdev_for_each_rcu(rdev
, mddev
) {
9777 if (!test_bit(Faulty
, &rdev
->flags
))
9778 read_rdev(mddev
, rdev
);
9781 EXPORT_SYMBOL(md_reload_sb
);
9786 * Searches all registered partitions for autorun RAID arrays
9790 static DEFINE_MUTEX(detected_devices_mutex
);
9791 static LIST_HEAD(all_detected_devices
);
9792 struct detected_devices_node
{
9793 struct list_head list
;
9797 void md_autodetect_dev(dev_t dev
)
9799 struct detected_devices_node
*node_detected_dev
;
9801 node_detected_dev
= kzalloc(sizeof(*node_detected_dev
), GFP_KERNEL
);
9802 if (node_detected_dev
) {
9803 node_detected_dev
->dev
= dev
;
9804 mutex_lock(&detected_devices_mutex
);
9805 list_add_tail(&node_detected_dev
->list
, &all_detected_devices
);
9806 mutex_unlock(&detected_devices_mutex
);
9810 void md_autostart_arrays(int part
)
9812 struct md_rdev
*rdev
;
9813 struct detected_devices_node
*node_detected_dev
;
9815 int i_scanned
, i_passed
;
9820 pr_info("md: Autodetecting RAID arrays.\n");
9822 mutex_lock(&detected_devices_mutex
);
9823 while (!list_empty(&all_detected_devices
) && i_scanned
< INT_MAX
) {
9825 node_detected_dev
= list_entry(all_detected_devices
.next
,
9826 struct detected_devices_node
, list
);
9827 list_del(&node_detected_dev
->list
);
9828 dev
= node_detected_dev
->dev
;
9829 kfree(node_detected_dev
);
9830 mutex_unlock(&detected_devices_mutex
);
9831 rdev
= md_import_device(dev
,0, 90);
9832 mutex_lock(&detected_devices_mutex
);
9836 if (test_bit(Faulty
, &rdev
->flags
))
9839 set_bit(AutoDetected
, &rdev
->flags
);
9840 list_add(&rdev
->same_set
, &pending_raid_disks
);
9843 mutex_unlock(&detected_devices_mutex
);
9845 pr_debug("md: Scanned %d and added %d devices.\n", i_scanned
, i_passed
);
9847 autorun_devices(part
);
9850 #endif /* !MODULE */
9852 static __exit
void md_exit(void)
9854 struct mddev
*mddev
;
9855 struct list_head
*tmp
;
9858 unregister_blkdev(MD_MAJOR
,"md");
9859 unregister_blkdev(mdp_major
, "mdp");
9860 unregister_reboot_notifier(&md_notifier
);
9861 unregister_sysctl_table(raid_table_header
);
9863 /* We cannot unload the modules while some process is
9864 * waiting for us in select() or poll() - wake them up
9867 while (waitqueue_active(&md_event_waiters
)) {
9868 /* not safe to leave yet */
9869 wake_up(&md_event_waiters
);
9873 remove_proc_entry("mdstat", NULL
);
9875 for_each_mddev(mddev
, tmp
) {
9876 export_array(mddev
);
9878 mddev
->hold_active
= 0;
9880 * for_each_mddev() will call mddev_put() at the end of each
9881 * iteration. As the mddev is now fully clear, this will
9882 * schedule the mddev for destruction by a workqueue, and the
9883 * destroy_workqueue() below will wait for that to complete.
9886 destroy_workqueue(md_rdev_misc_wq
);
9887 destroy_workqueue(md_misc_wq
);
9888 destroy_workqueue(md_wq
);
9891 subsys_initcall(md_init
);
9892 module_exit(md_exit
)
9894 static int get_ro(char *buffer
, const struct kernel_param
*kp
)
9896 return sprintf(buffer
, "%d\n", start_readonly
);
9898 static int set_ro(const char *val
, const struct kernel_param
*kp
)
9900 return kstrtouint(val
, 10, (unsigned int *)&start_readonly
);
9903 module_param_call(start_ro
, set_ro
, get_ro
, NULL
, S_IRUSR
|S_IWUSR
);
9904 module_param(start_dirty_degraded
, int, S_IRUGO
|S_IWUSR
);
9905 module_param_call(new_array
, add_named_array
, NULL
, NULL
, S_IWUSR
);
9906 module_param(create_on_open
, bool, S_IRUSR
|S_IWUSR
);
9908 MODULE_LICENSE("GPL");
9909 MODULE_DESCRIPTION("MD RAID framework");
9911 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);