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
);
444 static blk_qc_t
md_submit_bio(struct bio
*bio
)
446 const int rw
= bio_data_dir(bio
);
447 struct mddev
*mddev
= bio
->bi_bdev
->bd_disk
->private_data
;
449 if (mddev
== NULL
|| mddev
->pers
== NULL
) {
451 return BLK_QC_T_NONE
;
454 if (unlikely(test_bit(MD_BROKEN
, &mddev
->flags
)) && (rw
== WRITE
)) {
456 return BLK_QC_T_NONE
;
459 blk_queue_split(&bio
);
461 if (mddev
->ro
== 1 && unlikely(rw
== WRITE
)) {
462 if (bio_sectors(bio
) != 0)
463 bio
->bi_status
= BLK_STS_IOERR
;
465 return BLK_QC_T_NONE
;
468 /* bio could be mergeable after passing to underlayer */
469 bio
->bi_opf
&= ~REQ_NOMERGE
;
471 md_handle_request(mddev
, bio
);
473 return BLK_QC_T_NONE
;
476 /* mddev_suspend makes sure no new requests are submitted
477 * to the device, and that any requests that have been submitted
478 * are completely handled.
479 * Once mddev_detach() is called and completes, the module will be
482 void mddev_suspend(struct mddev
*mddev
)
484 WARN_ON_ONCE(mddev
->thread
&& current
== mddev
->thread
->tsk
);
485 lockdep_assert_held(&mddev
->reconfig_mutex
);
486 if (mddev
->suspended
++)
489 wake_up(&mddev
->sb_wait
);
490 set_bit(MD_ALLOW_SB_UPDATE
, &mddev
->flags
);
491 smp_mb__after_atomic();
492 wait_event(mddev
->sb_wait
, atomic_read(&mddev
->active_io
) == 0);
493 mddev
->pers
->quiesce(mddev
, 1);
494 clear_bit_unlock(MD_ALLOW_SB_UPDATE
, &mddev
->flags
);
495 wait_event(mddev
->sb_wait
, !test_bit(MD_UPDATING_SB
, &mddev
->flags
));
497 del_timer_sync(&mddev
->safemode_timer
);
498 /* restrict memory reclaim I/O during raid array is suspend */
499 mddev
->noio_flag
= memalloc_noio_save();
501 EXPORT_SYMBOL_GPL(mddev_suspend
);
503 void mddev_resume(struct mddev
*mddev
)
505 /* entred the memalloc scope from mddev_suspend() */
506 memalloc_noio_restore(mddev
->noio_flag
);
507 lockdep_assert_held(&mddev
->reconfig_mutex
);
508 if (--mddev
->suspended
)
510 wake_up(&mddev
->sb_wait
);
511 mddev
->pers
->quiesce(mddev
, 0);
513 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
514 md_wakeup_thread(mddev
->thread
);
515 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
517 EXPORT_SYMBOL_GPL(mddev_resume
);
520 * Generic flush handling for md
523 static void md_end_flush(struct bio
*bio
)
525 struct md_rdev
*rdev
= bio
->bi_private
;
526 struct mddev
*mddev
= rdev
->mddev
;
528 rdev_dec_pending(rdev
, mddev
);
530 if (atomic_dec_and_test(&mddev
->flush_pending
)) {
531 /* The pre-request flush has finished */
532 queue_work(md_wq
, &mddev
->flush_work
);
537 static void md_submit_flush_data(struct work_struct
*ws
);
539 static void submit_flushes(struct work_struct
*ws
)
541 struct mddev
*mddev
= container_of(ws
, struct mddev
, flush_work
);
542 struct md_rdev
*rdev
;
544 mddev
->start_flush
= ktime_get_boottime();
545 INIT_WORK(&mddev
->flush_work
, md_submit_flush_data
);
546 atomic_set(&mddev
->flush_pending
, 1);
548 rdev_for_each_rcu(rdev
, mddev
)
549 if (rdev
->raid_disk
>= 0 &&
550 !test_bit(Faulty
, &rdev
->flags
)) {
551 /* Take two references, one is dropped
552 * when request finishes, one after
553 * we reclaim rcu_read_lock
556 atomic_inc(&rdev
->nr_pending
);
557 atomic_inc(&rdev
->nr_pending
);
559 bi
= bio_alloc_bioset(GFP_NOIO
, 0, &mddev
->bio_set
);
560 bi
->bi_end_io
= md_end_flush
;
561 bi
->bi_private
= rdev
;
562 bio_set_dev(bi
, rdev
->bdev
);
563 bi
->bi_opf
= REQ_OP_WRITE
| REQ_PREFLUSH
;
564 atomic_inc(&mddev
->flush_pending
);
567 rdev_dec_pending(rdev
, mddev
);
570 if (atomic_dec_and_test(&mddev
->flush_pending
))
571 queue_work(md_wq
, &mddev
->flush_work
);
574 static void md_submit_flush_data(struct work_struct
*ws
)
576 struct mddev
*mddev
= container_of(ws
, struct mddev
, flush_work
);
577 struct bio
*bio
= mddev
->flush_bio
;
580 * must reset flush_bio before calling into md_handle_request to avoid a
581 * deadlock, because other bios passed md_handle_request suspend check
582 * could wait for this and below md_handle_request could wait for those
583 * bios because of suspend check
585 spin_lock_irq(&mddev
->lock
);
586 mddev
->prev_flush_start
= mddev
->start_flush
;
587 mddev
->flush_bio
= NULL
;
588 spin_unlock_irq(&mddev
->lock
);
589 wake_up(&mddev
->sb_wait
);
591 if (bio
->bi_iter
.bi_size
== 0) {
592 /* an empty barrier - all done */
595 bio
->bi_opf
&= ~REQ_PREFLUSH
;
596 md_handle_request(mddev
, bio
);
601 * Manages consolidation of flushes and submitting any flushes needed for
602 * a bio with REQ_PREFLUSH. Returns true if the bio is finished or is
603 * being finished in another context. Returns false if the flushing is
604 * complete but still needs the I/O portion of the bio to be processed.
606 bool md_flush_request(struct mddev
*mddev
, struct bio
*bio
)
608 ktime_t req_start
= ktime_get_boottime();
609 spin_lock_irq(&mddev
->lock
);
610 /* flush requests wait until ongoing flush completes,
611 * hence coalescing all the pending requests.
613 wait_event_lock_irq(mddev
->sb_wait
,
615 ktime_before(req_start
, mddev
->prev_flush_start
),
617 /* new request after previous flush is completed */
618 if (ktime_after(req_start
, mddev
->prev_flush_start
)) {
619 WARN_ON(mddev
->flush_bio
);
620 mddev
->flush_bio
= bio
;
623 spin_unlock_irq(&mddev
->lock
);
626 INIT_WORK(&mddev
->flush_work
, submit_flushes
);
627 queue_work(md_wq
, &mddev
->flush_work
);
629 /* flush was performed for some other bio while we waited. */
630 if (bio
->bi_iter
.bi_size
== 0)
631 /* an empty barrier - all done */
634 bio
->bi_opf
&= ~REQ_PREFLUSH
;
640 EXPORT_SYMBOL(md_flush_request
);
642 static inline struct mddev
*mddev_get(struct mddev
*mddev
)
644 atomic_inc(&mddev
->active
);
648 static void mddev_delayed_delete(struct work_struct
*ws
);
650 static void mddev_put(struct mddev
*mddev
)
652 if (!atomic_dec_and_lock(&mddev
->active
, &all_mddevs_lock
))
654 if (!mddev
->raid_disks
&& list_empty(&mddev
->disks
) &&
655 mddev
->ctime
== 0 && !mddev
->hold_active
) {
656 /* Array is not configured at all, and not held active,
658 list_del_init(&mddev
->all_mddevs
);
661 * Call queue_work inside the spinlock so that
662 * flush_workqueue() after mddev_find will succeed in waiting
663 * for the work to be done.
665 INIT_WORK(&mddev
->del_work
, mddev_delayed_delete
);
666 queue_work(md_misc_wq
, &mddev
->del_work
);
668 spin_unlock(&all_mddevs_lock
);
671 static void md_safemode_timeout(struct timer_list
*t
);
673 void mddev_init(struct mddev
*mddev
)
675 kobject_init(&mddev
->kobj
, &md_ktype
);
676 mutex_init(&mddev
->open_mutex
);
677 mutex_init(&mddev
->reconfig_mutex
);
678 mutex_init(&mddev
->bitmap_info
.mutex
);
679 INIT_LIST_HEAD(&mddev
->disks
);
680 INIT_LIST_HEAD(&mddev
->all_mddevs
);
681 timer_setup(&mddev
->safemode_timer
, md_safemode_timeout
, 0);
682 atomic_set(&mddev
->active
, 1);
683 atomic_set(&mddev
->openers
, 0);
684 atomic_set(&mddev
->active_io
, 0);
685 spin_lock_init(&mddev
->lock
);
686 atomic_set(&mddev
->flush_pending
, 0);
687 init_waitqueue_head(&mddev
->sb_wait
);
688 init_waitqueue_head(&mddev
->recovery_wait
);
689 mddev
->reshape_position
= MaxSector
;
690 mddev
->reshape_backwards
= 0;
691 mddev
->last_sync_action
= "none";
692 mddev
->resync_min
= 0;
693 mddev
->resync_max
= MaxSector
;
694 mddev
->level
= LEVEL_NONE
;
696 EXPORT_SYMBOL_GPL(mddev_init
);
698 static struct mddev
*mddev_find_locked(dev_t unit
)
702 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
703 if (mddev
->unit
== unit
)
709 /* find an unused unit number */
710 static dev_t
mddev_alloc_unit(void)
712 static int next_minor
= 512;
713 int start
= next_minor
;
718 dev
= MKDEV(MD_MAJOR
, next_minor
);
720 if (next_minor
> MINORMASK
)
722 if (next_minor
== start
)
723 return 0; /* Oh dear, all in use. */
724 is_free
= !mddev_find_locked(dev
);
730 static struct mddev
*mddev_find(dev_t unit
)
734 if (MAJOR(unit
) != MD_MAJOR
)
735 unit
&= ~((1 << MdpMinorShift
) - 1);
737 spin_lock(&all_mddevs_lock
);
738 mddev
= mddev_find_locked(unit
);
741 spin_unlock(&all_mddevs_lock
);
746 static struct mddev
*mddev_alloc(dev_t unit
)
751 if (unit
&& MAJOR(unit
) != MD_MAJOR
)
752 unit
&= ~((1 << MdpMinorShift
) - 1);
754 new = kzalloc(sizeof(*new), GFP_KERNEL
);
756 return ERR_PTR(-ENOMEM
);
759 spin_lock(&all_mddevs_lock
);
762 if (mddev_find_locked(unit
))
765 if (MAJOR(unit
) == MD_MAJOR
)
766 new->md_minor
= MINOR(unit
);
768 new->md_minor
= MINOR(unit
) >> MdpMinorShift
;
769 new->hold_active
= UNTIL_IOCTL
;
772 new->unit
= mddev_alloc_unit();
775 new->md_minor
= MINOR(new->unit
);
776 new->hold_active
= UNTIL_STOP
;
779 list_add(&new->all_mddevs
, &all_mddevs
);
780 spin_unlock(&all_mddevs_lock
);
783 spin_unlock(&all_mddevs_lock
);
785 return ERR_PTR(error
);
788 static const struct attribute_group md_redundancy_group
;
790 void mddev_unlock(struct mddev
*mddev
)
792 if (mddev
->to_remove
) {
793 /* These cannot be removed under reconfig_mutex as
794 * an access to the files will try to take reconfig_mutex
795 * while holding the file unremovable, which leads to
797 * So hold set sysfs_active while the remove in happeing,
798 * and anything else which might set ->to_remove or my
799 * otherwise change the sysfs namespace will fail with
800 * -EBUSY if sysfs_active is still set.
801 * We set sysfs_active under reconfig_mutex and elsewhere
802 * test it under the same mutex to ensure its correct value
805 const struct attribute_group
*to_remove
= mddev
->to_remove
;
806 mddev
->to_remove
= NULL
;
807 mddev
->sysfs_active
= 1;
808 mutex_unlock(&mddev
->reconfig_mutex
);
810 if (mddev
->kobj
.sd
) {
811 if (to_remove
!= &md_redundancy_group
)
812 sysfs_remove_group(&mddev
->kobj
, to_remove
);
813 if (mddev
->pers
== NULL
||
814 mddev
->pers
->sync_request
== NULL
) {
815 sysfs_remove_group(&mddev
->kobj
, &md_redundancy_group
);
816 if (mddev
->sysfs_action
)
817 sysfs_put(mddev
->sysfs_action
);
818 if (mddev
->sysfs_completed
)
819 sysfs_put(mddev
->sysfs_completed
);
820 if (mddev
->sysfs_degraded
)
821 sysfs_put(mddev
->sysfs_degraded
);
822 mddev
->sysfs_action
= NULL
;
823 mddev
->sysfs_completed
= NULL
;
824 mddev
->sysfs_degraded
= NULL
;
827 mddev
->sysfs_active
= 0;
829 mutex_unlock(&mddev
->reconfig_mutex
);
831 /* As we've dropped the mutex we need a spinlock to
832 * make sure the thread doesn't disappear
834 spin_lock(&pers_lock
);
835 md_wakeup_thread(mddev
->thread
);
836 wake_up(&mddev
->sb_wait
);
837 spin_unlock(&pers_lock
);
839 EXPORT_SYMBOL_GPL(mddev_unlock
);
841 struct md_rdev
*md_find_rdev_nr_rcu(struct mddev
*mddev
, int nr
)
843 struct md_rdev
*rdev
;
845 rdev_for_each_rcu(rdev
, mddev
)
846 if (rdev
->desc_nr
== nr
)
851 EXPORT_SYMBOL_GPL(md_find_rdev_nr_rcu
);
853 static struct md_rdev
*find_rdev(struct mddev
*mddev
, dev_t dev
)
855 struct md_rdev
*rdev
;
857 rdev_for_each(rdev
, mddev
)
858 if (rdev
->bdev
->bd_dev
== dev
)
864 struct md_rdev
*md_find_rdev_rcu(struct mddev
*mddev
, dev_t dev
)
866 struct md_rdev
*rdev
;
868 rdev_for_each_rcu(rdev
, mddev
)
869 if (rdev
->bdev
->bd_dev
== dev
)
874 EXPORT_SYMBOL_GPL(md_find_rdev_rcu
);
876 static struct md_personality
*find_pers(int level
, char *clevel
)
878 struct md_personality
*pers
;
879 list_for_each_entry(pers
, &pers_list
, list
) {
880 if (level
!= LEVEL_NONE
&& pers
->level
== level
)
882 if (strcmp(pers
->name
, clevel
)==0)
888 /* return the offset of the super block in 512byte sectors */
889 static inline sector_t
calc_dev_sboffset(struct md_rdev
*rdev
)
891 sector_t num_sectors
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
892 return MD_NEW_SIZE_SECTORS(num_sectors
);
895 static int alloc_disk_sb(struct md_rdev
*rdev
)
897 rdev
->sb_page
= alloc_page(GFP_KERNEL
);
903 void md_rdev_clear(struct md_rdev
*rdev
)
906 put_page(rdev
->sb_page
);
908 rdev
->sb_page
= NULL
;
913 put_page(rdev
->bb_page
);
914 rdev
->bb_page
= NULL
;
916 badblocks_exit(&rdev
->badblocks
);
918 EXPORT_SYMBOL_GPL(md_rdev_clear
);
920 static void super_written(struct bio
*bio
)
922 struct md_rdev
*rdev
= bio
->bi_private
;
923 struct mddev
*mddev
= rdev
->mddev
;
925 if (bio
->bi_status
) {
926 pr_err("md: %s gets error=%d\n", __func__
,
927 blk_status_to_errno(bio
->bi_status
));
928 md_error(mddev
, rdev
);
929 if (!test_bit(Faulty
, &rdev
->flags
)
930 && (bio
->bi_opf
& MD_FAILFAST
)) {
931 set_bit(MD_SB_NEED_REWRITE
, &mddev
->sb_flags
);
932 set_bit(LastDev
, &rdev
->flags
);
935 clear_bit(LastDev
, &rdev
->flags
);
937 if (atomic_dec_and_test(&mddev
->pending_writes
))
938 wake_up(&mddev
->sb_wait
);
939 rdev_dec_pending(rdev
, mddev
);
943 void md_super_write(struct mddev
*mddev
, struct md_rdev
*rdev
,
944 sector_t sector
, int size
, struct page
*page
)
946 /* write first size bytes of page to sector of rdev
947 * Increment mddev->pending_writes before returning
948 * and decrement it on completion, waking up sb_wait
949 * if zero is reached.
950 * If an error occurred, call md_error
958 if (test_bit(Faulty
, &rdev
->flags
))
961 bio
= bio_alloc_bioset(GFP_NOIO
, 1, &mddev
->sync_set
);
963 atomic_inc(&rdev
->nr_pending
);
965 bio_set_dev(bio
, rdev
->meta_bdev
? rdev
->meta_bdev
: rdev
->bdev
);
966 bio
->bi_iter
.bi_sector
= sector
;
967 bio_add_page(bio
, page
, size
, 0);
968 bio
->bi_private
= rdev
;
969 bio
->bi_end_io
= super_written
;
971 if (test_bit(MD_FAILFAST_SUPPORTED
, &mddev
->flags
) &&
972 test_bit(FailFast
, &rdev
->flags
) &&
973 !test_bit(LastDev
, &rdev
->flags
))
975 bio
->bi_opf
= REQ_OP_WRITE
| REQ_SYNC
| REQ_PREFLUSH
| REQ_FUA
| ff
;
977 atomic_inc(&mddev
->pending_writes
);
981 int md_super_wait(struct mddev
*mddev
)
983 /* wait for all superblock writes that were scheduled to complete */
984 wait_event(mddev
->sb_wait
, atomic_read(&mddev
->pending_writes
)==0);
985 if (test_and_clear_bit(MD_SB_NEED_REWRITE
, &mddev
->sb_flags
))
990 int sync_page_io(struct md_rdev
*rdev
, sector_t sector
, int size
,
991 struct page
*page
, int op
, int op_flags
, bool metadata_op
)
996 bio_init(&bio
, &bvec
, 1);
998 if (metadata_op
&& rdev
->meta_bdev
)
999 bio_set_dev(&bio
, rdev
->meta_bdev
);
1001 bio_set_dev(&bio
, rdev
->bdev
);
1002 bio
.bi_opf
= op
| op_flags
;
1004 bio
.bi_iter
.bi_sector
= sector
+ rdev
->sb_start
;
1005 else if (rdev
->mddev
->reshape_position
!= MaxSector
&&
1006 (rdev
->mddev
->reshape_backwards
==
1007 (sector
>= rdev
->mddev
->reshape_position
)))
1008 bio
.bi_iter
.bi_sector
= sector
+ rdev
->new_data_offset
;
1010 bio
.bi_iter
.bi_sector
= sector
+ rdev
->data_offset
;
1011 bio_add_page(&bio
, page
, size
, 0);
1013 submit_bio_wait(&bio
);
1015 return !bio
.bi_status
;
1017 EXPORT_SYMBOL_GPL(sync_page_io
);
1019 static int read_disk_sb(struct md_rdev
*rdev
, int size
)
1021 char b
[BDEVNAME_SIZE
];
1023 if (rdev
->sb_loaded
)
1026 if (!sync_page_io(rdev
, 0, size
, rdev
->sb_page
, REQ_OP_READ
, 0, true))
1028 rdev
->sb_loaded
= 1;
1032 pr_err("md: disabled device %s, could not read superblock.\n",
1033 bdevname(rdev
->bdev
,b
));
1037 static int md_uuid_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
1039 return sb1
->set_uuid0
== sb2
->set_uuid0
&&
1040 sb1
->set_uuid1
== sb2
->set_uuid1
&&
1041 sb1
->set_uuid2
== sb2
->set_uuid2
&&
1042 sb1
->set_uuid3
== sb2
->set_uuid3
;
1045 static int md_sb_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
1048 mdp_super_t
*tmp1
, *tmp2
;
1050 tmp1
= kmalloc(sizeof(*tmp1
),GFP_KERNEL
);
1051 tmp2
= kmalloc(sizeof(*tmp2
),GFP_KERNEL
);
1053 if (!tmp1
|| !tmp2
) {
1062 * nr_disks is not constant
1067 ret
= (memcmp(tmp1
, tmp2
, MD_SB_GENERIC_CONSTANT_WORDS
* 4) == 0);
1074 static u32
md_csum_fold(u32 csum
)
1076 csum
= (csum
& 0xffff) + (csum
>> 16);
1077 return (csum
& 0xffff) + (csum
>> 16);
1080 static unsigned int calc_sb_csum(mdp_super_t
*sb
)
1083 u32
*sb32
= (u32
*)sb
;
1085 unsigned int disk_csum
, csum
;
1087 disk_csum
= sb
->sb_csum
;
1090 for (i
= 0; i
< MD_SB_BYTES
/4 ; i
++)
1092 csum
= (newcsum
& 0xffffffff) + (newcsum
>>32);
1095 /* This used to use csum_partial, which was wrong for several
1096 * reasons including that different results are returned on
1097 * different architectures. It isn't critical that we get exactly
1098 * the same return value as before (we always csum_fold before
1099 * testing, and that removes any differences). However as we
1100 * know that csum_partial always returned a 16bit value on
1101 * alphas, do a fold to maximise conformity to previous behaviour.
1103 sb
->sb_csum
= md_csum_fold(disk_csum
);
1105 sb
->sb_csum
= disk_csum
;
1111 * Handle superblock details.
1112 * We want to be able to handle multiple superblock formats
1113 * so we have a common interface to them all, and an array of
1114 * different handlers.
1115 * We rely on user-space to write the initial superblock, and support
1116 * reading and updating of superblocks.
1117 * Interface methods are:
1118 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version)
1119 * loads and validates a superblock on dev.
1120 * if refdev != NULL, compare superblocks on both devices
1122 * 0 - dev has a superblock that is compatible with refdev
1123 * 1 - dev has a superblock that is compatible and newer than refdev
1124 * so dev should be used as the refdev in future
1125 * -EINVAL superblock incompatible or invalid
1126 * -othererror e.g. -EIO
1128 * int validate_super(struct mddev *mddev, struct md_rdev *dev)
1129 * Verify that dev is acceptable into mddev.
1130 * The first time, mddev->raid_disks will be 0, and data from
1131 * dev should be merged in. Subsequent calls check that dev
1132 * is new enough. Return 0 or -EINVAL
1134 * void sync_super(struct mddev *mddev, struct md_rdev *dev)
1135 * Update the superblock for rdev with data in mddev
1136 * This does not write to disc.
1142 struct module
*owner
;
1143 int (*load_super
)(struct md_rdev
*rdev
,
1144 struct md_rdev
*refdev
,
1146 int (*validate_super
)(struct mddev
*mddev
,
1147 struct md_rdev
*rdev
);
1148 void (*sync_super
)(struct mddev
*mddev
,
1149 struct md_rdev
*rdev
);
1150 unsigned long long (*rdev_size_change
)(struct md_rdev
*rdev
,
1151 sector_t num_sectors
);
1152 int (*allow_new_offset
)(struct md_rdev
*rdev
,
1153 unsigned long long new_offset
);
1157 * Check that the given mddev has no bitmap.
1159 * This function is called from the run method of all personalities that do not
1160 * support bitmaps. It prints an error message and returns non-zero if mddev
1161 * has a bitmap. Otherwise, it returns 0.
1164 int md_check_no_bitmap(struct mddev
*mddev
)
1166 if (!mddev
->bitmap_info
.file
&& !mddev
->bitmap_info
.offset
)
1168 pr_warn("%s: bitmaps are not supported for %s\n",
1169 mdname(mddev
), mddev
->pers
->name
);
1172 EXPORT_SYMBOL(md_check_no_bitmap
);
1175 * load_super for 0.90.0
1177 static int super_90_load(struct md_rdev
*rdev
, struct md_rdev
*refdev
, int minor_version
)
1179 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1182 bool spare_disk
= true;
1185 * Calculate the position of the superblock (512byte sectors),
1186 * it's at the end of the disk.
1188 * It also happens to be a multiple of 4Kb.
1190 rdev
->sb_start
= calc_dev_sboffset(rdev
);
1192 ret
= read_disk_sb(rdev
, MD_SB_BYTES
);
1198 bdevname(rdev
->bdev
, b
);
1199 sb
= page_address(rdev
->sb_page
);
1201 if (sb
->md_magic
!= MD_SB_MAGIC
) {
1202 pr_warn("md: invalid raid superblock magic on %s\n", b
);
1206 if (sb
->major_version
!= 0 ||
1207 sb
->minor_version
< 90 ||
1208 sb
->minor_version
> 91) {
1209 pr_warn("Bad version number %d.%d on %s\n",
1210 sb
->major_version
, sb
->minor_version
, b
);
1214 if (sb
->raid_disks
<= 0)
1217 if (md_csum_fold(calc_sb_csum(sb
)) != md_csum_fold(sb
->sb_csum
)) {
1218 pr_warn("md: invalid superblock checksum on %s\n", b
);
1222 rdev
->preferred_minor
= sb
->md_minor
;
1223 rdev
->data_offset
= 0;
1224 rdev
->new_data_offset
= 0;
1225 rdev
->sb_size
= MD_SB_BYTES
;
1226 rdev
->badblocks
.shift
= -1;
1228 if (sb
->level
== LEVEL_MULTIPATH
)
1231 rdev
->desc_nr
= sb
->this_disk
.number
;
1233 /* not spare disk, or LEVEL_MULTIPATH */
1234 if (sb
->level
== LEVEL_MULTIPATH
||
1235 (rdev
->desc_nr
>= 0 &&
1236 rdev
->desc_nr
< MD_SB_DISKS
&&
1237 sb
->disks
[rdev
->desc_nr
].state
&
1238 ((1<<MD_DISK_SYNC
) | (1 << MD_DISK_ACTIVE
))))
1248 mdp_super_t
*refsb
= page_address(refdev
->sb_page
);
1249 if (!md_uuid_equal(refsb
, sb
)) {
1250 pr_warn("md: %s has different UUID to %s\n",
1251 b
, bdevname(refdev
->bdev
,b2
));
1254 if (!md_sb_equal(refsb
, sb
)) {
1255 pr_warn("md: %s has same UUID but different superblock to %s\n",
1256 b
, bdevname(refdev
->bdev
, b2
));
1260 ev2
= md_event(refsb
);
1262 if (!spare_disk
&& ev1
> ev2
)
1267 rdev
->sectors
= rdev
->sb_start
;
1268 /* Limit to 4TB as metadata cannot record more than that.
1269 * (not needed for Linear and RAID0 as metadata doesn't
1272 if ((u64
)rdev
->sectors
>= (2ULL << 32) && sb
->level
>= 1)
1273 rdev
->sectors
= (sector_t
)(2ULL << 32) - 2;
1275 if (rdev
->sectors
< ((sector_t
)sb
->size
) * 2 && sb
->level
>= 1)
1276 /* "this cannot possibly happen" ... */
1284 * validate_super for 0.90.0
1286 static int super_90_validate(struct mddev
*mddev
, struct md_rdev
*rdev
)
1289 mdp_super_t
*sb
= page_address(rdev
->sb_page
);
1290 __u64 ev1
= md_event(sb
);
1292 rdev
->raid_disk
= -1;
1293 clear_bit(Faulty
, &rdev
->flags
);
1294 clear_bit(In_sync
, &rdev
->flags
);
1295 clear_bit(Bitmap_sync
, &rdev
->flags
);
1296 clear_bit(WriteMostly
, &rdev
->flags
);
1298 if (mddev
->raid_disks
== 0) {
1299 mddev
->major_version
= 0;
1300 mddev
->minor_version
= sb
->minor_version
;
1301 mddev
->patch_version
= sb
->patch_version
;
1302 mddev
->external
= 0;
1303 mddev
->chunk_sectors
= sb
->chunk_size
>> 9;
1304 mddev
->ctime
= sb
->ctime
;
1305 mddev
->utime
= sb
->utime
;
1306 mddev
->level
= sb
->level
;
1307 mddev
->clevel
[0] = 0;
1308 mddev
->layout
= sb
->layout
;
1309 mddev
->raid_disks
= sb
->raid_disks
;
1310 mddev
->dev_sectors
= ((sector_t
)sb
->size
) * 2;
1311 mddev
->events
= ev1
;
1312 mddev
->bitmap_info
.offset
= 0;
1313 mddev
->bitmap_info
.space
= 0;
1314 /* bitmap can use 60 K after the 4K superblocks */
1315 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
1316 mddev
->bitmap_info
.default_space
= 64*2 - (MD_SB_BYTES
>> 9);
1317 mddev
->reshape_backwards
= 0;
1319 if (mddev
->minor_version
>= 91) {
1320 mddev
->reshape_position
= sb
->reshape_position
;
1321 mddev
->delta_disks
= sb
->delta_disks
;
1322 mddev
->new_level
= sb
->new_level
;
1323 mddev
->new_layout
= sb
->new_layout
;
1324 mddev
->new_chunk_sectors
= sb
->new_chunk
>> 9;
1325 if (mddev
->delta_disks
< 0)
1326 mddev
->reshape_backwards
= 1;
1328 mddev
->reshape_position
= MaxSector
;
1329 mddev
->delta_disks
= 0;
1330 mddev
->new_level
= mddev
->level
;
1331 mddev
->new_layout
= mddev
->layout
;
1332 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1334 if (mddev
->level
== 0)
1337 if (sb
->state
& (1<<MD_SB_CLEAN
))
1338 mddev
->recovery_cp
= MaxSector
;
1340 if (sb
->events_hi
== sb
->cp_events_hi
&&
1341 sb
->events_lo
== sb
->cp_events_lo
) {
1342 mddev
->recovery_cp
= sb
->recovery_cp
;
1344 mddev
->recovery_cp
= 0;
1347 memcpy(mddev
->uuid
+0, &sb
->set_uuid0
, 4);
1348 memcpy(mddev
->uuid
+4, &sb
->set_uuid1
, 4);
1349 memcpy(mddev
->uuid
+8, &sb
->set_uuid2
, 4);
1350 memcpy(mddev
->uuid
+12,&sb
->set_uuid3
, 4);
1352 mddev
->max_disks
= MD_SB_DISKS
;
1354 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
) &&
1355 mddev
->bitmap_info
.file
== NULL
) {
1356 mddev
->bitmap_info
.offset
=
1357 mddev
->bitmap_info
.default_offset
;
1358 mddev
->bitmap_info
.space
=
1359 mddev
->bitmap_info
.default_space
;
1362 } else if (mddev
->pers
== NULL
) {
1363 /* Insist on good event counter while assembling, except
1364 * for spares (which don't need an event count) */
1366 if (sb
->disks
[rdev
->desc_nr
].state
& (
1367 (1<<MD_DISK_SYNC
) | (1 << MD_DISK_ACTIVE
)))
1368 if (ev1
< mddev
->events
)
1370 } else if (mddev
->bitmap
) {
1371 /* if adding to array with a bitmap, then we can accept an
1372 * older device ... but not too old.
1374 if (ev1
< mddev
->bitmap
->events_cleared
)
1376 if (ev1
< mddev
->events
)
1377 set_bit(Bitmap_sync
, &rdev
->flags
);
1379 if (ev1
< mddev
->events
)
1380 /* just a hot-add of a new device, leave raid_disk at -1 */
1384 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1385 desc
= sb
->disks
+ rdev
->desc_nr
;
1387 if (desc
->state
& (1<<MD_DISK_FAULTY
))
1388 set_bit(Faulty
, &rdev
->flags
);
1389 else if (desc
->state
& (1<<MD_DISK_SYNC
) /* &&
1390 desc->raid_disk < mddev->raid_disks */) {
1391 set_bit(In_sync
, &rdev
->flags
);
1392 rdev
->raid_disk
= desc
->raid_disk
;
1393 rdev
->saved_raid_disk
= desc
->raid_disk
;
1394 } else if (desc
->state
& (1<<MD_DISK_ACTIVE
)) {
1395 /* active but not in sync implies recovery up to
1396 * reshape position. We don't know exactly where
1397 * that is, so set to zero for now */
1398 if (mddev
->minor_version
>= 91) {
1399 rdev
->recovery_offset
= 0;
1400 rdev
->raid_disk
= desc
->raid_disk
;
1403 if (desc
->state
& (1<<MD_DISK_WRITEMOSTLY
))
1404 set_bit(WriteMostly
, &rdev
->flags
);
1405 if (desc
->state
& (1<<MD_DISK_FAILFAST
))
1406 set_bit(FailFast
, &rdev
->flags
);
1407 } else /* MULTIPATH are always insync */
1408 set_bit(In_sync
, &rdev
->flags
);
1413 * sync_super for 0.90.0
1415 static void super_90_sync(struct mddev
*mddev
, struct md_rdev
*rdev
)
1418 struct md_rdev
*rdev2
;
1419 int next_spare
= mddev
->raid_disks
;
1421 /* make rdev->sb match mddev data..
1424 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1425 * 3/ any empty disks < next_spare become removed
1427 * disks[0] gets initialised to REMOVED because
1428 * we cannot be sure from other fields if it has
1429 * been initialised or not.
1432 int active
=0, working
=0,failed
=0,spare
=0,nr_disks
=0;
1434 rdev
->sb_size
= MD_SB_BYTES
;
1436 sb
= page_address(rdev
->sb_page
);
1438 memset(sb
, 0, sizeof(*sb
));
1440 sb
->md_magic
= MD_SB_MAGIC
;
1441 sb
->major_version
= mddev
->major_version
;
1442 sb
->patch_version
= mddev
->patch_version
;
1443 sb
->gvalid_words
= 0; /* ignored */
1444 memcpy(&sb
->set_uuid0
, mddev
->uuid
+0, 4);
1445 memcpy(&sb
->set_uuid1
, mddev
->uuid
+4, 4);
1446 memcpy(&sb
->set_uuid2
, mddev
->uuid
+8, 4);
1447 memcpy(&sb
->set_uuid3
, mddev
->uuid
+12,4);
1449 sb
->ctime
= clamp_t(time64_t
, mddev
->ctime
, 0, U32_MAX
);
1450 sb
->level
= mddev
->level
;
1451 sb
->size
= mddev
->dev_sectors
/ 2;
1452 sb
->raid_disks
= mddev
->raid_disks
;
1453 sb
->md_minor
= mddev
->md_minor
;
1454 sb
->not_persistent
= 0;
1455 sb
->utime
= clamp_t(time64_t
, mddev
->utime
, 0, U32_MAX
);
1457 sb
->events_hi
= (mddev
->events
>>32);
1458 sb
->events_lo
= (u32
)mddev
->events
;
1460 if (mddev
->reshape_position
== MaxSector
)
1461 sb
->minor_version
= 90;
1463 sb
->minor_version
= 91;
1464 sb
->reshape_position
= mddev
->reshape_position
;
1465 sb
->new_level
= mddev
->new_level
;
1466 sb
->delta_disks
= mddev
->delta_disks
;
1467 sb
->new_layout
= mddev
->new_layout
;
1468 sb
->new_chunk
= mddev
->new_chunk_sectors
<< 9;
1470 mddev
->minor_version
= sb
->minor_version
;
1473 sb
->recovery_cp
= mddev
->recovery_cp
;
1474 sb
->cp_events_hi
= (mddev
->events
>>32);
1475 sb
->cp_events_lo
= (u32
)mddev
->events
;
1476 if (mddev
->recovery_cp
== MaxSector
)
1477 sb
->state
= (1<< MD_SB_CLEAN
);
1479 sb
->recovery_cp
= 0;
1481 sb
->layout
= mddev
->layout
;
1482 sb
->chunk_size
= mddev
->chunk_sectors
<< 9;
1484 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
)
1485 sb
->state
|= (1<<MD_SB_BITMAP_PRESENT
);
1487 sb
->disks
[0].state
= (1<<MD_DISK_REMOVED
);
1488 rdev_for_each(rdev2
, mddev
) {
1491 int is_active
= test_bit(In_sync
, &rdev2
->flags
);
1493 if (rdev2
->raid_disk
>= 0 &&
1494 sb
->minor_version
>= 91)
1495 /* we have nowhere to store the recovery_offset,
1496 * but if it is not below the reshape_position,
1497 * we can piggy-back on that.
1500 if (rdev2
->raid_disk
< 0 ||
1501 test_bit(Faulty
, &rdev2
->flags
))
1504 desc_nr
= rdev2
->raid_disk
;
1506 desc_nr
= next_spare
++;
1507 rdev2
->desc_nr
= desc_nr
;
1508 d
= &sb
->disks
[rdev2
->desc_nr
];
1510 d
->number
= rdev2
->desc_nr
;
1511 d
->major
= MAJOR(rdev2
->bdev
->bd_dev
);
1512 d
->minor
= MINOR(rdev2
->bdev
->bd_dev
);
1514 d
->raid_disk
= rdev2
->raid_disk
;
1516 d
->raid_disk
= rdev2
->desc_nr
; /* compatibility */
1517 if (test_bit(Faulty
, &rdev2
->flags
))
1518 d
->state
= (1<<MD_DISK_FAULTY
);
1519 else if (is_active
) {
1520 d
->state
= (1<<MD_DISK_ACTIVE
);
1521 if (test_bit(In_sync
, &rdev2
->flags
))
1522 d
->state
|= (1<<MD_DISK_SYNC
);
1530 if (test_bit(WriteMostly
, &rdev2
->flags
))
1531 d
->state
|= (1<<MD_DISK_WRITEMOSTLY
);
1532 if (test_bit(FailFast
, &rdev2
->flags
))
1533 d
->state
|= (1<<MD_DISK_FAILFAST
);
1535 /* now set the "removed" and "faulty" bits on any missing devices */
1536 for (i
=0 ; i
< mddev
->raid_disks
; i
++) {
1537 mdp_disk_t
*d
= &sb
->disks
[i
];
1538 if (d
->state
== 0 && d
->number
== 0) {
1541 d
->state
= (1<<MD_DISK_REMOVED
);
1542 d
->state
|= (1<<MD_DISK_FAULTY
);
1546 sb
->nr_disks
= nr_disks
;
1547 sb
->active_disks
= active
;
1548 sb
->working_disks
= working
;
1549 sb
->failed_disks
= failed
;
1550 sb
->spare_disks
= spare
;
1552 sb
->this_disk
= sb
->disks
[rdev
->desc_nr
];
1553 sb
->sb_csum
= calc_sb_csum(sb
);
1557 * rdev_size_change for 0.90.0
1559 static unsigned long long
1560 super_90_rdev_size_change(struct md_rdev
*rdev
, sector_t num_sectors
)
1562 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1563 return 0; /* component must fit device */
1564 if (rdev
->mddev
->bitmap_info
.offset
)
1565 return 0; /* can't move bitmap */
1566 rdev
->sb_start
= calc_dev_sboffset(rdev
);
1567 if (!num_sectors
|| num_sectors
> rdev
->sb_start
)
1568 num_sectors
= rdev
->sb_start
;
1569 /* Limit to 4TB as metadata cannot record more than that.
1570 * 4TB == 2^32 KB, or 2*2^32 sectors.
1572 if ((u64
)num_sectors
>= (2ULL << 32) && rdev
->mddev
->level
>= 1)
1573 num_sectors
= (sector_t
)(2ULL << 32) - 2;
1575 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1577 } while (md_super_wait(rdev
->mddev
) < 0);
1582 super_90_allow_new_offset(struct md_rdev
*rdev
, unsigned long long new_offset
)
1584 /* non-zero offset changes not possible with v0.90 */
1585 return new_offset
== 0;
1589 * version 1 superblock
1592 static __le32
calc_sb_1_csum(struct mdp_superblock_1
*sb
)
1596 unsigned long long newcsum
;
1597 int size
= 256 + le32_to_cpu(sb
->max_dev
)*2;
1598 __le32
*isuper
= (__le32
*)sb
;
1600 disk_csum
= sb
->sb_csum
;
1603 for (; size
>= 4; size
-= 4)
1604 newcsum
+= le32_to_cpu(*isuper
++);
1607 newcsum
+= le16_to_cpu(*(__le16
*) isuper
);
1609 csum
= (newcsum
& 0xffffffff) + (newcsum
>> 32);
1610 sb
->sb_csum
= disk_csum
;
1611 return cpu_to_le32(csum
);
1614 static int super_1_load(struct md_rdev
*rdev
, struct md_rdev
*refdev
, int minor_version
)
1616 struct mdp_superblock_1
*sb
;
1620 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1622 bool spare_disk
= true;
1625 * Calculate the position of the superblock in 512byte sectors.
1626 * It is always aligned to a 4K boundary and
1627 * depeding on minor_version, it can be:
1628 * 0: At least 8K, but less than 12K, from end of device
1629 * 1: At start of device
1630 * 2: 4K from start of device.
1632 switch(minor_version
) {
1634 sb_start
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1636 sb_start
&= ~(sector_t
)(4*2-1);
1647 rdev
->sb_start
= sb_start
;
1649 /* superblock is rarely larger than 1K, but it can be larger,
1650 * and it is safe to read 4k, so we do that
1652 ret
= read_disk_sb(rdev
, 4096);
1653 if (ret
) return ret
;
1655 sb
= page_address(rdev
->sb_page
);
1657 if (sb
->magic
!= cpu_to_le32(MD_SB_MAGIC
) ||
1658 sb
->major_version
!= cpu_to_le32(1) ||
1659 le32_to_cpu(sb
->max_dev
) > (4096-256)/2 ||
1660 le64_to_cpu(sb
->super_offset
) != rdev
->sb_start
||
1661 (le32_to_cpu(sb
->feature_map
) & ~MD_FEATURE_ALL
) != 0)
1664 if (calc_sb_1_csum(sb
) != sb
->sb_csum
) {
1665 pr_warn("md: invalid superblock checksum on %s\n",
1666 bdevname(rdev
->bdev
,b
));
1669 if (le64_to_cpu(sb
->data_size
) < 10) {
1670 pr_warn("md: data_size too small on %s\n",
1671 bdevname(rdev
->bdev
,b
));
1676 memcmp(sb
->pad3
, sb
->pad3
+1, sizeof(sb
->pad3
) - sizeof(sb
->pad3
[1])))
1677 /* Some padding is non-zero, might be a new feature */
1680 rdev
->preferred_minor
= 0xffff;
1681 rdev
->data_offset
= le64_to_cpu(sb
->data_offset
);
1682 rdev
->new_data_offset
= rdev
->data_offset
;
1683 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
) &&
1684 (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_NEW_OFFSET
))
1685 rdev
->new_data_offset
+= (s32
)le32_to_cpu(sb
->new_offset
);
1686 atomic_set(&rdev
->corrected_errors
, le32_to_cpu(sb
->cnt_corrected_read
));
1688 rdev
->sb_size
= le32_to_cpu(sb
->max_dev
) * 2 + 256;
1689 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1690 if (rdev
->sb_size
& bmask
)
1691 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1694 && rdev
->data_offset
< sb_start
+ (rdev
->sb_size
/512))
1697 && rdev
->new_data_offset
< sb_start
+ (rdev
->sb_size
/512))
1700 if (sb
->level
== cpu_to_le32(LEVEL_MULTIPATH
))
1703 rdev
->desc_nr
= le32_to_cpu(sb
->dev_number
);
1705 if (!rdev
->bb_page
) {
1706 rdev
->bb_page
= alloc_page(GFP_KERNEL
);
1710 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BAD_BLOCKS
) &&
1711 rdev
->badblocks
.count
== 0) {
1712 /* need to load the bad block list.
1713 * Currently we limit it to one page.
1719 int sectors
= le16_to_cpu(sb
->bblog_size
);
1720 if (sectors
> (PAGE_SIZE
/ 512))
1722 offset
= le32_to_cpu(sb
->bblog_offset
);
1725 bb_sector
= (long long)offset
;
1726 if (!sync_page_io(rdev
, bb_sector
, sectors
<< 9,
1727 rdev
->bb_page
, REQ_OP_READ
, 0, true))
1729 bbp
= (__le64
*)page_address(rdev
->bb_page
);
1730 rdev
->badblocks
.shift
= sb
->bblog_shift
;
1731 for (i
= 0 ; i
< (sectors
<< (9-3)) ; i
++, bbp
++) {
1732 u64 bb
= le64_to_cpu(*bbp
);
1733 int count
= bb
& (0x3ff);
1734 u64 sector
= bb
>> 10;
1735 sector
<<= sb
->bblog_shift
;
1736 count
<<= sb
->bblog_shift
;
1739 if (badblocks_set(&rdev
->badblocks
, sector
, count
, 1))
1742 } else if (sb
->bblog_offset
!= 0)
1743 rdev
->badblocks
.shift
= 0;
1745 if ((le32_to_cpu(sb
->feature_map
) &
1746 (MD_FEATURE_PPL
| MD_FEATURE_MULTIPLE_PPLS
))) {
1747 rdev
->ppl
.offset
= (__s16
)le16_to_cpu(sb
->ppl
.offset
);
1748 rdev
->ppl
.size
= le16_to_cpu(sb
->ppl
.size
);
1749 rdev
->ppl
.sector
= rdev
->sb_start
+ rdev
->ppl
.offset
;
1752 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RAID0_LAYOUT
) &&
1756 /* not spare disk, or LEVEL_MULTIPATH */
1757 if (sb
->level
== cpu_to_le32(LEVEL_MULTIPATH
) ||
1758 (rdev
->desc_nr
>= 0 &&
1759 rdev
->desc_nr
< le32_to_cpu(sb
->max_dev
) &&
1760 (le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]) < MD_DISK_ROLE_MAX
||
1761 le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]) == MD_DISK_ROLE_JOURNAL
)))
1771 struct mdp_superblock_1
*refsb
= page_address(refdev
->sb_page
);
1773 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16) != 0 ||
1774 sb
->level
!= refsb
->level
||
1775 sb
->layout
!= refsb
->layout
||
1776 sb
->chunksize
!= refsb
->chunksize
) {
1777 pr_warn("md: %s has strangely different superblock to %s\n",
1778 bdevname(rdev
->bdev
,b
),
1779 bdevname(refdev
->bdev
,b2
));
1782 ev1
= le64_to_cpu(sb
->events
);
1783 ev2
= le64_to_cpu(refsb
->events
);
1785 if (!spare_disk
&& ev1
> ev2
)
1790 if (minor_version
) {
1791 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9);
1792 sectors
-= rdev
->data_offset
;
1794 sectors
= rdev
->sb_start
;
1795 if (sectors
< le64_to_cpu(sb
->data_size
))
1797 rdev
->sectors
= le64_to_cpu(sb
->data_size
);
1801 static int super_1_validate(struct mddev
*mddev
, struct md_rdev
*rdev
)
1803 struct mdp_superblock_1
*sb
= page_address(rdev
->sb_page
);
1804 __u64 ev1
= le64_to_cpu(sb
->events
);
1806 rdev
->raid_disk
= -1;
1807 clear_bit(Faulty
, &rdev
->flags
);
1808 clear_bit(In_sync
, &rdev
->flags
);
1809 clear_bit(Bitmap_sync
, &rdev
->flags
);
1810 clear_bit(WriteMostly
, &rdev
->flags
);
1812 if (mddev
->raid_disks
== 0) {
1813 mddev
->major_version
= 1;
1814 mddev
->patch_version
= 0;
1815 mddev
->external
= 0;
1816 mddev
->chunk_sectors
= le32_to_cpu(sb
->chunksize
);
1817 mddev
->ctime
= le64_to_cpu(sb
->ctime
);
1818 mddev
->utime
= le64_to_cpu(sb
->utime
);
1819 mddev
->level
= le32_to_cpu(sb
->level
);
1820 mddev
->clevel
[0] = 0;
1821 mddev
->layout
= le32_to_cpu(sb
->layout
);
1822 mddev
->raid_disks
= le32_to_cpu(sb
->raid_disks
);
1823 mddev
->dev_sectors
= le64_to_cpu(sb
->size
);
1824 mddev
->events
= ev1
;
1825 mddev
->bitmap_info
.offset
= 0;
1826 mddev
->bitmap_info
.space
= 0;
1827 /* Default location for bitmap is 1K after superblock
1828 * using 3K - total of 4K
1830 mddev
->bitmap_info
.default_offset
= 1024 >> 9;
1831 mddev
->bitmap_info
.default_space
= (4096-1024) >> 9;
1832 mddev
->reshape_backwards
= 0;
1834 mddev
->recovery_cp
= le64_to_cpu(sb
->resync_offset
);
1835 memcpy(mddev
->uuid
, sb
->set_uuid
, 16);
1837 mddev
->max_disks
= (4096-256)/2;
1839 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
) &&
1840 mddev
->bitmap_info
.file
== NULL
) {
1841 mddev
->bitmap_info
.offset
=
1842 (__s32
)le32_to_cpu(sb
->bitmap_offset
);
1843 /* Metadata doesn't record how much space is available.
1844 * For 1.0, we assume we can use up to the superblock
1845 * if before, else to 4K beyond superblock.
1846 * For others, assume no change is possible.
1848 if (mddev
->minor_version
> 0)
1849 mddev
->bitmap_info
.space
= 0;
1850 else if (mddev
->bitmap_info
.offset
> 0)
1851 mddev
->bitmap_info
.space
=
1852 8 - mddev
->bitmap_info
.offset
;
1854 mddev
->bitmap_info
.space
=
1855 -mddev
->bitmap_info
.offset
;
1858 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
1859 mddev
->reshape_position
= le64_to_cpu(sb
->reshape_position
);
1860 mddev
->delta_disks
= le32_to_cpu(sb
->delta_disks
);
1861 mddev
->new_level
= le32_to_cpu(sb
->new_level
);
1862 mddev
->new_layout
= le32_to_cpu(sb
->new_layout
);
1863 mddev
->new_chunk_sectors
= le32_to_cpu(sb
->new_chunk
);
1864 if (mddev
->delta_disks
< 0 ||
1865 (mddev
->delta_disks
== 0 &&
1866 (le32_to_cpu(sb
->feature_map
)
1867 & MD_FEATURE_RESHAPE_BACKWARDS
)))
1868 mddev
->reshape_backwards
= 1;
1870 mddev
->reshape_position
= MaxSector
;
1871 mddev
->delta_disks
= 0;
1872 mddev
->new_level
= mddev
->level
;
1873 mddev
->new_layout
= mddev
->layout
;
1874 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1877 if (mddev
->level
== 0 &&
1878 !(le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RAID0_LAYOUT
))
1881 if (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_JOURNAL
)
1882 set_bit(MD_HAS_JOURNAL
, &mddev
->flags
);
1884 if (le32_to_cpu(sb
->feature_map
) &
1885 (MD_FEATURE_PPL
| MD_FEATURE_MULTIPLE_PPLS
)) {
1886 if (le32_to_cpu(sb
->feature_map
) &
1887 (MD_FEATURE_BITMAP_OFFSET
| MD_FEATURE_JOURNAL
))
1889 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_PPL
) &&
1890 (le32_to_cpu(sb
->feature_map
) &
1891 MD_FEATURE_MULTIPLE_PPLS
))
1893 set_bit(MD_HAS_PPL
, &mddev
->flags
);
1895 } else if (mddev
->pers
== NULL
) {
1896 /* Insist of good event counter while assembling, except for
1897 * spares (which don't need an event count) */
1899 if (rdev
->desc_nr
>= 0 &&
1900 rdev
->desc_nr
< le32_to_cpu(sb
->max_dev
) &&
1901 (le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]) < MD_DISK_ROLE_MAX
||
1902 le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]) == MD_DISK_ROLE_JOURNAL
))
1903 if (ev1
< mddev
->events
)
1905 } else if (mddev
->bitmap
) {
1906 /* If adding to array with a bitmap, then we can accept an
1907 * older device, but not too old.
1909 if (ev1
< mddev
->bitmap
->events_cleared
)
1911 if (ev1
< mddev
->events
)
1912 set_bit(Bitmap_sync
, &rdev
->flags
);
1914 if (ev1
< mddev
->events
)
1915 /* just a hot-add of a new device, leave raid_disk at -1 */
1918 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1920 if (rdev
->desc_nr
< 0 ||
1921 rdev
->desc_nr
>= le32_to_cpu(sb
->max_dev
)) {
1922 role
= MD_DISK_ROLE_SPARE
;
1925 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
1927 case MD_DISK_ROLE_SPARE
: /* spare */
1929 case MD_DISK_ROLE_FAULTY
: /* faulty */
1930 set_bit(Faulty
, &rdev
->flags
);
1932 case MD_DISK_ROLE_JOURNAL
: /* journal device */
1933 if (!(le32_to_cpu(sb
->feature_map
) & MD_FEATURE_JOURNAL
)) {
1934 /* journal device without journal feature */
1935 pr_warn("md: journal device provided without journal feature, ignoring the device\n");
1938 set_bit(Journal
, &rdev
->flags
);
1939 rdev
->journal_tail
= le64_to_cpu(sb
->journal_tail
);
1940 rdev
->raid_disk
= 0;
1943 rdev
->saved_raid_disk
= role
;
1944 if ((le32_to_cpu(sb
->feature_map
) &
1945 MD_FEATURE_RECOVERY_OFFSET
)) {
1946 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
1947 if (!(le32_to_cpu(sb
->feature_map
) &
1948 MD_FEATURE_RECOVERY_BITMAP
))
1949 rdev
->saved_raid_disk
= -1;
1952 * If the array is FROZEN, then the device can't
1953 * be in_sync with rest of array.
1955 if (!test_bit(MD_RECOVERY_FROZEN
,
1957 set_bit(In_sync
, &rdev
->flags
);
1959 rdev
->raid_disk
= role
;
1962 if (sb
->devflags
& WriteMostly1
)
1963 set_bit(WriteMostly
, &rdev
->flags
);
1964 if (sb
->devflags
& FailFast1
)
1965 set_bit(FailFast
, &rdev
->flags
);
1966 if (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_REPLACEMENT
)
1967 set_bit(Replacement
, &rdev
->flags
);
1968 } else /* MULTIPATH are always insync */
1969 set_bit(In_sync
, &rdev
->flags
);
1974 static void super_1_sync(struct mddev
*mddev
, struct md_rdev
*rdev
)
1976 struct mdp_superblock_1
*sb
;
1977 struct md_rdev
*rdev2
;
1979 /* make rdev->sb match mddev and rdev data. */
1981 sb
= page_address(rdev
->sb_page
);
1983 sb
->feature_map
= 0;
1985 sb
->recovery_offset
= cpu_to_le64(0);
1986 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
1988 sb
->utime
= cpu_to_le64((__u64
)mddev
->utime
);
1989 sb
->events
= cpu_to_le64(mddev
->events
);
1991 sb
->resync_offset
= cpu_to_le64(mddev
->recovery_cp
);
1992 else if (test_bit(MD_JOURNAL_CLEAN
, &mddev
->flags
))
1993 sb
->resync_offset
= cpu_to_le64(MaxSector
);
1995 sb
->resync_offset
= cpu_to_le64(0);
1997 sb
->cnt_corrected_read
= cpu_to_le32(atomic_read(&rdev
->corrected_errors
));
1999 sb
->raid_disks
= cpu_to_le32(mddev
->raid_disks
);
2000 sb
->size
= cpu_to_le64(mddev
->dev_sectors
);
2001 sb
->chunksize
= cpu_to_le32(mddev
->chunk_sectors
);
2002 sb
->level
= cpu_to_le32(mddev
->level
);
2003 sb
->layout
= cpu_to_le32(mddev
->layout
);
2004 if (test_bit(FailFast
, &rdev
->flags
))
2005 sb
->devflags
|= FailFast1
;
2007 sb
->devflags
&= ~FailFast1
;
2009 if (test_bit(WriteMostly
, &rdev
->flags
))
2010 sb
->devflags
|= WriteMostly1
;
2012 sb
->devflags
&= ~WriteMostly1
;
2013 sb
->data_offset
= cpu_to_le64(rdev
->data_offset
);
2014 sb
->data_size
= cpu_to_le64(rdev
->sectors
);
2016 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
) {
2017 sb
->bitmap_offset
= cpu_to_le32((__u32
)mddev
->bitmap_info
.offset
);
2018 sb
->feature_map
= cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
);
2021 if (rdev
->raid_disk
>= 0 && !test_bit(Journal
, &rdev
->flags
) &&
2022 !test_bit(In_sync
, &rdev
->flags
)) {
2024 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET
);
2025 sb
->recovery_offset
=
2026 cpu_to_le64(rdev
->recovery_offset
);
2027 if (rdev
->saved_raid_disk
>= 0 && mddev
->bitmap
)
2029 cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP
);
2031 /* Note: recovery_offset and journal_tail share space */
2032 if (test_bit(Journal
, &rdev
->flags
))
2033 sb
->journal_tail
= cpu_to_le64(rdev
->journal_tail
);
2034 if (test_bit(Replacement
, &rdev
->flags
))
2036 cpu_to_le32(MD_FEATURE_REPLACEMENT
);
2038 if (mddev
->reshape_position
!= MaxSector
) {
2039 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE
);
2040 sb
->reshape_position
= cpu_to_le64(mddev
->reshape_position
);
2041 sb
->new_layout
= cpu_to_le32(mddev
->new_layout
);
2042 sb
->delta_disks
= cpu_to_le32(mddev
->delta_disks
);
2043 sb
->new_level
= cpu_to_le32(mddev
->new_level
);
2044 sb
->new_chunk
= cpu_to_le32(mddev
->new_chunk_sectors
);
2045 if (mddev
->delta_disks
== 0 &&
2046 mddev
->reshape_backwards
)
2048 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS
);
2049 if (rdev
->new_data_offset
!= rdev
->data_offset
) {
2051 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET
);
2052 sb
->new_offset
= cpu_to_le32((__u32
)(rdev
->new_data_offset
2053 - rdev
->data_offset
));
2057 if (mddev_is_clustered(mddev
))
2058 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_CLUSTERED
);
2060 if (rdev
->badblocks
.count
== 0)
2061 /* Nothing to do for bad blocks*/ ;
2062 else if (sb
->bblog_offset
== 0)
2063 /* Cannot record bad blocks on this device */
2064 md_error(mddev
, rdev
);
2066 struct badblocks
*bb
= &rdev
->badblocks
;
2067 __le64
*bbp
= (__le64
*)page_address(rdev
->bb_page
);
2069 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_BAD_BLOCKS
);
2074 seq
= read_seqbegin(&bb
->lock
);
2076 memset(bbp
, 0xff, PAGE_SIZE
);
2078 for (i
= 0 ; i
< bb
->count
; i
++) {
2079 u64 internal_bb
= p
[i
];
2080 u64 store_bb
= ((BB_OFFSET(internal_bb
) << 10)
2081 | BB_LEN(internal_bb
));
2082 bbp
[i
] = cpu_to_le64(store_bb
);
2085 if (read_seqretry(&bb
->lock
, seq
))
2088 bb
->sector
= (rdev
->sb_start
+
2089 (int)le32_to_cpu(sb
->bblog_offset
));
2090 bb
->size
= le16_to_cpu(sb
->bblog_size
);
2095 rdev_for_each(rdev2
, mddev
)
2096 if (rdev2
->desc_nr
+1 > max_dev
)
2097 max_dev
= rdev2
->desc_nr
+1;
2099 if (max_dev
> le32_to_cpu(sb
->max_dev
)) {
2101 sb
->max_dev
= cpu_to_le32(max_dev
);
2102 rdev
->sb_size
= max_dev
* 2 + 256;
2103 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
2104 if (rdev
->sb_size
& bmask
)
2105 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
2107 max_dev
= le32_to_cpu(sb
->max_dev
);
2109 for (i
=0; i
<max_dev
;i
++)
2110 sb
->dev_roles
[i
] = cpu_to_le16(MD_DISK_ROLE_SPARE
);
2112 if (test_bit(MD_HAS_JOURNAL
, &mddev
->flags
))
2113 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_JOURNAL
);
2115 if (test_bit(MD_HAS_PPL
, &mddev
->flags
)) {
2116 if (test_bit(MD_HAS_MULTIPLE_PPLS
, &mddev
->flags
))
2118 cpu_to_le32(MD_FEATURE_MULTIPLE_PPLS
);
2120 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_PPL
);
2121 sb
->ppl
.offset
= cpu_to_le16(rdev
->ppl
.offset
);
2122 sb
->ppl
.size
= cpu_to_le16(rdev
->ppl
.size
);
2125 rdev_for_each(rdev2
, mddev
) {
2127 if (test_bit(Faulty
, &rdev2
->flags
))
2128 sb
->dev_roles
[i
] = cpu_to_le16(MD_DISK_ROLE_FAULTY
);
2129 else if (test_bit(In_sync
, &rdev2
->flags
))
2130 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
2131 else if (test_bit(Journal
, &rdev2
->flags
))
2132 sb
->dev_roles
[i
] = cpu_to_le16(MD_DISK_ROLE_JOURNAL
);
2133 else if (rdev2
->raid_disk
>= 0)
2134 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
2136 sb
->dev_roles
[i
] = cpu_to_le16(MD_DISK_ROLE_SPARE
);
2139 sb
->sb_csum
= calc_sb_1_csum(sb
);
2142 static sector_t
super_1_choose_bm_space(sector_t dev_size
)
2146 /* if the device is bigger than 8Gig, save 64k for bitmap
2147 * usage, if bigger than 200Gig, save 128k
2149 if (dev_size
< 64*2)
2151 else if (dev_size
- 64*2 >= 200*1024*1024*2)
2153 else if (dev_size
- 4*2 > 8*1024*1024*2)
2160 static unsigned long long
2161 super_1_rdev_size_change(struct md_rdev
*rdev
, sector_t num_sectors
)
2163 struct mdp_superblock_1
*sb
;
2164 sector_t max_sectors
;
2165 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
2166 return 0; /* component must fit device */
2167 if (rdev
->data_offset
!= rdev
->new_data_offset
)
2168 return 0; /* too confusing */
2169 if (rdev
->sb_start
< rdev
->data_offset
) {
2170 /* minor versions 1 and 2; superblock before data */
2171 max_sectors
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
2172 max_sectors
-= rdev
->data_offset
;
2173 if (!num_sectors
|| num_sectors
> max_sectors
)
2174 num_sectors
= max_sectors
;
2175 } else if (rdev
->mddev
->bitmap_info
.offset
) {
2176 /* minor version 0 with bitmap we can't move */
2179 /* minor version 0; superblock after data */
2180 sector_t sb_start
, bm_space
;
2181 sector_t dev_size
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
2183 /* 8K is for superblock */
2184 sb_start
= dev_size
- 8*2;
2185 sb_start
&= ~(sector_t
)(4*2 - 1);
2187 bm_space
= super_1_choose_bm_space(dev_size
);
2189 /* Space that can be used to store date needs to decrease
2190 * superblock bitmap space and bad block space(4K)
2192 max_sectors
= sb_start
- bm_space
- 4*2;
2194 if (!num_sectors
|| num_sectors
> max_sectors
)
2195 num_sectors
= max_sectors
;
2197 sb
= page_address(rdev
->sb_page
);
2198 sb
->data_size
= cpu_to_le64(num_sectors
);
2199 sb
->super_offset
= cpu_to_le64(rdev
->sb_start
);
2200 sb
->sb_csum
= calc_sb_1_csum(sb
);
2202 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
2204 } while (md_super_wait(rdev
->mddev
) < 0);
2210 super_1_allow_new_offset(struct md_rdev
*rdev
,
2211 unsigned long long new_offset
)
2213 /* All necessary checks on new >= old have been done */
2214 struct bitmap
*bitmap
;
2215 if (new_offset
>= rdev
->data_offset
)
2218 /* with 1.0 metadata, there is no metadata to tread on
2219 * so we can always move back */
2220 if (rdev
->mddev
->minor_version
== 0)
2223 /* otherwise we must be sure not to step on
2224 * any metadata, so stay:
2225 * 36K beyond start of superblock
2226 * beyond end of badblocks
2227 * beyond write-intent bitmap
2229 if (rdev
->sb_start
+ (32+4)*2 > new_offset
)
2231 bitmap
= rdev
->mddev
->bitmap
;
2232 if (bitmap
&& !rdev
->mddev
->bitmap_info
.file
&&
2233 rdev
->sb_start
+ rdev
->mddev
->bitmap_info
.offset
+
2234 bitmap
->storage
.file_pages
* (PAGE_SIZE
>>9) > new_offset
)
2236 if (rdev
->badblocks
.sector
+ rdev
->badblocks
.size
> new_offset
)
2242 static struct super_type super_types
[] = {
2245 .owner
= THIS_MODULE
,
2246 .load_super
= super_90_load
,
2247 .validate_super
= super_90_validate
,
2248 .sync_super
= super_90_sync
,
2249 .rdev_size_change
= super_90_rdev_size_change
,
2250 .allow_new_offset
= super_90_allow_new_offset
,
2254 .owner
= THIS_MODULE
,
2255 .load_super
= super_1_load
,
2256 .validate_super
= super_1_validate
,
2257 .sync_super
= super_1_sync
,
2258 .rdev_size_change
= super_1_rdev_size_change
,
2259 .allow_new_offset
= super_1_allow_new_offset
,
2263 static void sync_super(struct mddev
*mddev
, struct md_rdev
*rdev
)
2265 if (mddev
->sync_super
) {
2266 mddev
->sync_super(mddev
, rdev
);
2270 BUG_ON(mddev
->major_version
>= ARRAY_SIZE(super_types
));
2272 super_types
[mddev
->major_version
].sync_super(mddev
, rdev
);
2275 static int match_mddev_units(struct mddev
*mddev1
, struct mddev
*mddev2
)
2277 struct md_rdev
*rdev
, *rdev2
;
2280 rdev_for_each_rcu(rdev
, mddev1
) {
2281 if (test_bit(Faulty
, &rdev
->flags
) ||
2282 test_bit(Journal
, &rdev
->flags
) ||
2283 rdev
->raid_disk
== -1)
2285 rdev_for_each_rcu(rdev2
, mddev2
) {
2286 if (test_bit(Faulty
, &rdev2
->flags
) ||
2287 test_bit(Journal
, &rdev2
->flags
) ||
2288 rdev2
->raid_disk
== -1)
2290 if (rdev
->bdev
->bd_disk
== rdev2
->bdev
->bd_disk
) {
2300 static LIST_HEAD(pending_raid_disks
);
2303 * Try to register data integrity profile for an mddev
2305 * This is called when an array is started and after a disk has been kicked
2306 * from the array. It only succeeds if all working and active component devices
2307 * are integrity capable with matching profiles.
2309 int md_integrity_register(struct mddev
*mddev
)
2311 struct md_rdev
*rdev
, *reference
= NULL
;
2313 if (list_empty(&mddev
->disks
))
2314 return 0; /* nothing to do */
2315 if (!mddev
->gendisk
|| blk_get_integrity(mddev
->gendisk
))
2316 return 0; /* shouldn't register, or already is */
2317 rdev_for_each(rdev
, mddev
) {
2318 /* skip spares and non-functional disks */
2319 if (test_bit(Faulty
, &rdev
->flags
))
2321 if (rdev
->raid_disk
< 0)
2324 /* Use the first rdev as the reference */
2328 /* does this rdev's profile match the reference profile? */
2329 if (blk_integrity_compare(reference
->bdev
->bd_disk
,
2330 rdev
->bdev
->bd_disk
) < 0)
2333 if (!reference
|| !bdev_get_integrity(reference
->bdev
))
2336 * All component devices are integrity capable and have matching
2337 * profiles, register the common profile for the md device.
2339 blk_integrity_register(mddev
->gendisk
,
2340 bdev_get_integrity(reference
->bdev
));
2342 pr_debug("md: data integrity enabled on %s\n", mdname(mddev
));
2343 if (bioset_integrity_create(&mddev
->bio_set
, BIO_POOL_SIZE
) ||
2344 (mddev
->level
!= 1 && mddev
->level
!= 10 &&
2345 bioset_integrity_create(&mddev
->io_acct_set
, BIO_POOL_SIZE
))) {
2347 * No need to handle the failure of bioset_integrity_create,
2348 * because the function is called by md_run() -> pers->run(),
2349 * md_run calls bioset_exit -> bioset_integrity_free in case
2352 pr_err("md: failed to create integrity pool for %s\n",
2358 EXPORT_SYMBOL(md_integrity_register
);
2361 * Attempt to add an rdev, but only if it is consistent with the current
2364 int md_integrity_add_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
2366 struct blk_integrity
*bi_mddev
;
2367 char name
[BDEVNAME_SIZE
];
2369 if (!mddev
->gendisk
)
2372 bi_mddev
= blk_get_integrity(mddev
->gendisk
);
2374 if (!bi_mddev
) /* nothing to do */
2377 if (blk_integrity_compare(mddev
->gendisk
, rdev
->bdev
->bd_disk
) != 0) {
2378 pr_err("%s: incompatible integrity profile for %s\n",
2379 mdname(mddev
), bdevname(rdev
->bdev
, name
));
2385 EXPORT_SYMBOL(md_integrity_add_rdev
);
2387 static bool rdev_read_only(struct md_rdev
*rdev
)
2389 return bdev_read_only(rdev
->bdev
) ||
2390 (rdev
->meta_bdev
&& bdev_read_only(rdev
->meta_bdev
));
2393 static int bind_rdev_to_array(struct md_rdev
*rdev
, struct mddev
*mddev
)
2395 char b
[BDEVNAME_SIZE
];
2398 /* prevent duplicates */
2399 if (find_rdev(mddev
, rdev
->bdev
->bd_dev
))
2402 if (rdev_read_only(rdev
) && mddev
->pers
)
2405 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2406 if (!test_bit(Journal
, &rdev
->flags
) &&
2408 (mddev
->dev_sectors
== 0 || rdev
->sectors
< mddev
->dev_sectors
)) {
2410 /* Cannot change size, so fail
2411 * If mddev->level <= 0, then we don't care
2412 * about aligning sizes (e.g. linear)
2414 if (mddev
->level
> 0)
2417 mddev
->dev_sectors
= rdev
->sectors
;
2420 /* Verify rdev->desc_nr is unique.
2421 * If it is -1, assign a free number, else
2422 * check number is not in use
2425 if (rdev
->desc_nr
< 0) {
2428 choice
= mddev
->raid_disks
;
2429 while (md_find_rdev_nr_rcu(mddev
, choice
))
2431 rdev
->desc_nr
= choice
;
2433 if (md_find_rdev_nr_rcu(mddev
, rdev
->desc_nr
)) {
2439 if (!test_bit(Journal
, &rdev
->flags
) &&
2440 mddev
->max_disks
&& rdev
->desc_nr
>= mddev
->max_disks
) {
2441 pr_warn("md: %s: array is limited to %d devices\n",
2442 mdname(mddev
), mddev
->max_disks
);
2445 bdevname(rdev
->bdev
,b
);
2446 strreplace(b
, '/', '!');
2448 rdev
->mddev
= mddev
;
2449 pr_debug("md: bind<%s>\n", b
);
2451 if (mddev
->raid_disks
)
2452 mddev_create_serial_pool(mddev
, rdev
, false);
2454 if ((err
= kobject_add(&rdev
->kobj
, &mddev
->kobj
, "dev-%s", b
)))
2457 /* failure here is OK */
2458 err
= sysfs_create_link(&rdev
->kobj
, bdev_kobj(rdev
->bdev
), "block");
2459 rdev
->sysfs_state
= sysfs_get_dirent_safe(rdev
->kobj
.sd
, "state");
2460 rdev
->sysfs_unack_badblocks
=
2461 sysfs_get_dirent_safe(rdev
->kobj
.sd
, "unacknowledged_bad_blocks");
2462 rdev
->sysfs_badblocks
=
2463 sysfs_get_dirent_safe(rdev
->kobj
.sd
, "bad_blocks");
2465 list_add_rcu(&rdev
->same_set
, &mddev
->disks
);
2466 bd_link_disk_holder(rdev
->bdev
, mddev
->gendisk
);
2468 /* May as well allow recovery to be retried once */
2469 mddev
->recovery_disabled
++;
2474 pr_warn("md: failed to register dev-%s for %s\n",
2479 static void rdev_delayed_delete(struct work_struct
*ws
)
2481 struct md_rdev
*rdev
= container_of(ws
, struct md_rdev
, del_work
);
2482 kobject_del(&rdev
->kobj
);
2483 kobject_put(&rdev
->kobj
);
2486 static void unbind_rdev_from_array(struct md_rdev
*rdev
)
2488 char b
[BDEVNAME_SIZE
];
2490 bd_unlink_disk_holder(rdev
->bdev
, rdev
->mddev
->gendisk
);
2491 list_del_rcu(&rdev
->same_set
);
2492 pr_debug("md: unbind<%s>\n", bdevname(rdev
->bdev
,b
));
2493 mddev_destroy_serial_pool(rdev
->mddev
, rdev
, false);
2495 sysfs_remove_link(&rdev
->kobj
, "block");
2496 sysfs_put(rdev
->sysfs_state
);
2497 sysfs_put(rdev
->sysfs_unack_badblocks
);
2498 sysfs_put(rdev
->sysfs_badblocks
);
2499 rdev
->sysfs_state
= NULL
;
2500 rdev
->sysfs_unack_badblocks
= NULL
;
2501 rdev
->sysfs_badblocks
= NULL
;
2502 rdev
->badblocks
.count
= 0;
2503 /* We need to delay this, otherwise we can deadlock when
2504 * writing to 'remove' to "dev/state". We also need
2505 * to delay it due to rcu usage.
2508 INIT_WORK(&rdev
->del_work
, rdev_delayed_delete
);
2509 kobject_get(&rdev
->kobj
);
2510 queue_work(md_rdev_misc_wq
, &rdev
->del_work
);
2514 * prevent the device from being mounted, repartitioned or
2515 * otherwise reused by a RAID array (or any other kernel
2516 * subsystem), by bd_claiming the device.
2518 static int lock_rdev(struct md_rdev
*rdev
, dev_t dev
, int shared
)
2521 struct block_device
*bdev
;
2523 bdev
= blkdev_get_by_dev(dev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
,
2524 shared
? (struct md_rdev
*)lock_rdev
: rdev
);
2526 pr_warn("md: could not open device unknown-block(%u,%u).\n",
2527 MAJOR(dev
), MINOR(dev
));
2528 return PTR_ERR(bdev
);
2534 static void unlock_rdev(struct md_rdev
*rdev
)
2536 struct block_device
*bdev
= rdev
->bdev
;
2538 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
);
2541 void md_autodetect_dev(dev_t dev
);
2543 static void export_rdev(struct md_rdev
*rdev
)
2545 char b
[BDEVNAME_SIZE
];
2547 pr_debug("md: export_rdev(%s)\n", bdevname(rdev
->bdev
,b
));
2548 md_rdev_clear(rdev
);
2550 if (test_bit(AutoDetected
, &rdev
->flags
))
2551 md_autodetect_dev(rdev
->bdev
->bd_dev
);
2554 kobject_put(&rdev
->kobj
);
2557 void md_kick_rdev_from_array(struct md_rdev
*rdev
)
2559 unbind_rdev_from_array(rdev
);
2562 EXPORT_SYMBOL_GPL(md_kick_rdev_from_array
);
2564 static void export_array(struct mddev
*mddev
)
2566 struct md_rdev
*rdev
;
2568 while (!list_empty(&mddev
->disks
)) {
2569 rdev
= list_first_entry(&mddev
->disks
, struct md_rdev
,
2571 md_kick_rdev_from_array(rdev
);
2573 mddev
->raid_disks
= 0;
2574 mddev
->major_version
= 0;
2577 static bool set_in_sync(struct mddev
*mddev
)
2579 lockdep_assert_held(&mddev
->lock
);
2580 if (!mddev
->in_sync
) {
2581 mddev
->sync_checkers
++;
2582 spin_unlock(&mddev
->lock
);
2583 percpu_ref_switch_to_atomic_sync(&mddev
->writes_pending
);
2584 spin_lock(&mddev
->lock
);
2585 if (!mddev
->in_sync
&&
2586 percpu_ref_is_zero(&mddev
->writes_pending
)) {
2589 * Ensure ->in_sync is visible before we clear
2593 set_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
2594 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
2596 if (--mddev
->sync_checkers
== 0)
2597 percpu_ref_switch_to_percpu(&mddev
->writes_pending
);
2599 if (mddev
->safemode
== 1)
2600 mddev
->safemode
= 0;
2601 return mddev
->in_sync
;
2604 static void sync_sbs(struct mddev
*mddev
, int nospares
)
2606 /* Update each superblock (in-memory image), but
2607 * if we are allowed to, skip spares which already
2608 * have the right event counter, or have one earlier
2609 * (which would mean they aren't being marked as dirty
2610 * with the rest of the array)
2612 struct md_rdev
*rdev
;
2613 rdev_for_each(rdev
, mddev
) {
2614 if (rdev
->sb_events
== mddev
->events
||
2616 rdev
->raid_disk
< 0 &&
2617 rdev
->sb_events
+1 == mddev
->events
)) {
2618 /* Don't update this superblock */
2619 rdev
->sb_loaded
= 2;
2621 sync_super(mddev
, rdev
);
2622 rdev
->sb_loaded
= 1;
2627 static bool does_sb_need_changing(struct mddev
*mddev
)
2629 struct md_rdev
*rdev
;
2630 struct mdp_superblock_1
*sb
;
2633 /* Find a good rdev */
2634 rdev_for_each(rdev
, mddev
)
2635 if ((rdev
->raid_disk
>= 0) && !test_bit(Faulty
, &rdev
->flags
))
2638 /* No good device found. */
2642 sb
= page_address(rdev
->sb_page
);
2643 /* Check if a device has become faulty or a spare become active */
2644 rdev_for_each(rdev
, mddev
) {
2645 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
2646 /* Device activated? */
2647 if (role
== 0xffff && rdev
->raid_disk
>=0 &&
2648 !test_bit(Faulty
, &rdev
->flags
))
2650 /* Device turned faulty? */
2651 if (test_bit(Faulty
, &rdev
->flags
) && (role
< 0xfffd))
2655 /* Check if any mddev parameters have changed */
2656 if ((mddev
->dev_sectors
!= le64_to_cpu(sb
->size
)) ||
2657 (mddev
->reshape_position
!= le64_to_cpu(sb
->reshape_position
)) ||
2658 (mddev
->layout
!= le32_to_cpu(sb
->layout
)) ||
2659 (mddev
->raid_disks
!= le32_to_cpu(sb
->raid_disks
)) ||
2660 (mddev
->chunk_sectors
!= le32_to_cpu(sb
->chunksize
)))
2666 void md_update_sb(struct mddev
*mddev
, int force_change
)
2668 struct md_rdev
*rdev
;
2671 int any_badblocks_changed
= 0;
2676 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
2681 if (mddev_is_clustered(mddev
)) {
2682 if (test_and_clear_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
))
2684 if (test_and_clear_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
))
2686 ret
= md_cluster_ops
->metadata_update_start(mddev
);
2687 /* Has someone else has updated the sb */
2688 if (!does_sb_need_changing(mddev
)) {
2690 md_cluster_ops
->metadata_update_cancel(mddev
);
2691 bit_clear_unless(&mddev
->sb_flags
, BIT(MD_SB_CHANGE_PENDING
),
2692 BIT(MD_SB_CHANGE_DEVS
) |
2693 BIT(MD_SB_CHANGE_CLEAN
));
2699 * First make sure individual recovery_offsets are correct
2700 * curr_resync_completed can only be used during recovery.
2701 * During reshape/resync it might use array-addresses rather
2702 * that device addresses.
2704 rdev_for_each(rdev
, mddev
) {
2705 if (rdev
->raid_disk
>= 0 &&
2706 mddev
->delta_disks
>= 0 &&
2707 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
2708 test_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
) &&
2709 !test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
2710 !test_bit(Journal
, &rdev
->flags
) &&
2711 !test_bit(In_sync
, &rdev
->flags
) &&
2712 mddev
->curr_resync_completed
> rdev
->recovery_offset
)
2713 rdev
->recovery_offset
= mddev
->curr_resync_completed
;
2716 if (!mddev
->persistent
) {
2717 clear_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
2718 clear_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
2719 if (!mddev
->external
) {
2720 clear_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
2721 rdev_for_each(rdev
, mddev
) {
2722 if (rdev
->badblocks
.changed
) {
2723 rdev
->badblocks
.changed
= 0;
2724 ack_all_badblocks(&rdev
->badblocks
);
2725 md_error(mddev
, rdev
);
2727 clear_bit(Blocked
, &rdev
->flags
);
2728 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2729 wake_up(&rdev
->blocked_wait
);
2732 wake_up(&mddev
->sb_wait
);
2736 spin_lock(&mddev
->lock
);
2738 mddev
->utime
= ktime_get_real_seconds();
2740 if (test_and_clear_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
))
2742 if (test_and_clear_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
))
2743 /* just a clean<-> dirty transition, possibly leave spares alone,
2744 * though if events isn't the right even/odd, we will have to do
2750 if (mddev
->degraded
)
2751 /* If the array is degraded, then skipping spares is both
2752 * dangerous and fairly pointless.
2753 * Dangerous because a device that was removed from the array
2754 * might have a event_count that still looks up-to-date,
2755 * so it can be re-added without a resync.
2756 * Pointless because if there are any spares to skip,
2757 * then a recovery will happen and soon that array won't
2758 * be degraded any more and the spare can go back to sleep then.
2762 sync_req
= mddev
->in_sync
;
2764 /* If this is just a dirty<->clean transition, and the array is clean
2765 * and 'events' is odd, we can roll back to the previous clean state */
2767 && (mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
2768 && mddev
->can_decrease_events
2769 && mddev
->events
!= 1) {
2771 mddev
->can_decrease_events
= 0;
2773 /* otherwise we have to go forward and ... */
2775 mddev
->can_decrease_events
= nospares
;
2779 * This 64-bit counter should never wrap.
2780 * Either we are in around ~1 trillion A.C., assuming
2781 * 1 reboot per second, or we have a bug...
2783 WARN_ON(mddev
->events
== 0);
2785 rdev_for_each(rdev
, mddev
) {
2786 if (rdev
->badblocks
.changed
)
2787 any_badblocks_changed
++;
2788 if (test_bit(Faulty
, &rdev
->flags
))
2789 set_bit(FaultRecorded
, &rdev
->flags
);
2792 sync_sbs(mddev
, nospares
);
2793 spin_unlock(&mddev
->lock
);
2795 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2796 mdname(mddev
), mddev
->in_sync
);
2799 blk_add_trace_msg(mddev
->queue
, "md md_update_sb");
2801 md_bitmap_update_sb(mddev
->bitmap
);
2802 rdev_for_each(rdev
, mddev
) {
2803 char b
[BDEVNAME_SIZE
];
2805 if (rdev
->sb_loaded
!= 1)
2806 continue; /* no noise on spare devices */
2808 if (!test_bit(Faulty
, &rdev
->flags
)) {
2809 md_super_write(mddev
,rdev
,
2810 rdev
->sb_start
, rdev
->sb_size
,
2812 pr_debug("md: (write) %s's sb offset: %llu\n",
2813 bdevname(rdev
->bdev
, b
),
2814 (unsigned long long)rdev
->sb_start
);
2815 rdev
->sb_events
= mddev
->events
;
2816 if (rdev
->badblocks
.size
) {
2817 md_super_write(mddev
, rdev
,
2818 rdev
->badblocks
.sector
,
2819 rdev
->badblocks
.size
<< 9,
2821 rdev
->badblocks
.size
= 0;
2825 pr_debug("md: %s (skipping faulty)\n",
2826 bdevname(rdev
->bdev
, b
));
2828 if (mddev
->level
== LEVEL_MULTIPATH
)
2829 /* only need to write one superblock... */
2832 if (md_super_wait(mddev
) < 0)
2834 /* if there was a failure, MD_SB_CHANGE_DEVS was set, and we re-write super */
2836 if (mddev_is_clustered(mddev
) && ret
== 0)
2837 md_cluster_ops
->metadata_update_finish(mddev
);
2839 if (mddev
->in_sync
!= sync_req
||
2840 !bit_clear_unless(&mddev
->sb_flags
, BIT(MD_SB_CHANGE_PENDING
),
2841 BIT(MD_SB_CHANGE_DEVS
) | BIT(MD_SB_CHANGE_CLEAN
)))
2842 /* have to write it out again */
2844 wake_up(&mddev
->sb_wait
);
2845 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
2846 sysfs_notify_dirent_safe(mddev
->sysfs_completed
);
2848 rdev_for_each(rdev
, mddev
) {
2849 if (test_and_clear_bit(FaultRecorded
, &rdev
->flags
))
2850 clear_bit(Blocked
, &rdev
->flags
);
2852 if (any_badblocks_changed
)
2853 ack_all_badblocks(&rdev
->badblocks
);
2854 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2855 wake_up(&rdev
->blocked_wait
);
2858 EXPORT_SYMBOL(md_update_sb
);
2860 static int add_bound_rdev(struct md_rdev
*rdev
)
2862 struct mddev
*mddev
= rdev
->mddev
;
2864 bool add_journal
= test_bit(Journal
, &rdev
->flags
);
2866 if (!mddev
->pers
->hot_remove_disk
|| add_journal
) {
2867 /* If there is hot_add_disk but no hot_remove_disk
2868 * then added disks for geometry changes,
2869 * and should be added immediately.
2871 super_types
[mddev
->major_version
].
2872 validate_super(mddev
, rdev
);
2874 mddev_suspend(mddev
);
2875 err
= mddev
->pers
->hot_add_disk(mddev
, rdev
);
2877 mddev_resume(mddev
);
2879 md_kick_rdev_from_array(rdev
);
2883 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2885 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
2886 if (mddev
->degraded
)
2887 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
2888 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
2889 md_new_event(mddev
);
2890 md_wakeup_thread(mddev
->thread
);
2894 /* words written to sysfs files may, or may not, be \n terminated.
2895 * We want to accept with case. For this we use cmd_match.
2897 static int cmd_match(const char *cmd
, const char *str
)
2899 /* See if cmd, written into a sysfs file, matches
2900 * str. They must either be the same, or cmd can
2901 * have a trailing newline
2903 while (*cmd
&& *str
&& *cmd
== *str
) {
2914 struct rdev_sysfs_entry
{
2915 struct attribute attr
;
2916 ssize_t (*show
)(struct md_rdev
*, char *);
2917 ssize_t (*store
)(struct md_rdev
*, const char *, size_t);
2921 state_show(struct md_rdev
*rdev
, char *page
)
2925 unsigned long flags
= READ_ONCE(rdev
->flags
);
2927 if (test_bit(Faulty
, &flags
) ||
2928 (!test_bit(ExternalBbl
, &flags
) &&
2929 rdev
->badblocks
.unacked_exist
))
2930 len
+= sprintf(page
+len
, "faulty%s", sep
);
2931 if (test_bit(In_sync
, &flags
))
2932 len
+= sprintf(page
+len
, "in_sync%s", sep
);
2933 if (test_bit(Journal
, &flags
))
2934 len
+= sprintf(page
+len
, "journal%s", sep
);
2935 if (test_bit(WriteMostly
, &flags
))
2936 len
+= sprintf(page
+len
, "write_mostly%s", sep
);
2937 if (test_bit(Blocked
, &flags
) ||
2938 (rdev
->badblocks
.unacked_exist
2939 && !test_bit(Faulty
, &flags
)))
2940 len
+= sprintf(page
+len
, "blocked%s", sep
);
2941 if (!test_bit(Faulty
, &flags
) &&
2942 !test_bit(Journal
, &flags
) &&
2943 !test_bit(In_sync
, &flags
))
2944 len
+= sprintf(page
+len
, "spare%s", sep
);
2945 if (test_bit(WriteErrorSeen
, &flags
))
2946 len
+= sprintf(page
+len
, "write_error%s", sep
);
2947 if (test_bit(WantReplacement
, &flags
))
2948 len
+= sprintf(page
+len
, "want_replacement%s", sep
);
2949 if (test_bit(Replacement
, &flags
))
2950 len
+= sprintf(page
+len
, "replacement%s", sep
);
2951 if (test_bit(ExternalBbl
, &flags
))
2952 len
+= sprintf(page
+len
, "external_bbl%s", sep
);
2953 if (test_bit(FailFast
, &flags
))
2954 len
+= sprintf(page
+len
, "failfast%s", sep
);
2959 return len
+sprintf(page
+len
, "\n");
2963 state_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2966 * faulty - simulates an error
2967 * remove - disconnects the device
2968 * writemostly - sets write_mostly
2969 * -writemostly - clears write_mostly
2970 * blocked - sets the Blocked flags
2971 * -blocked - clears the Blocked and possibly simulates an error
2972 * insync - sets Insync providing device isn't active
2973 * -insync - clear Insync for a device with a slot assigned,
2974 * so that it gets rebuilt based on bitmap
2975 * write_error - sets WriteErrorSeen
2976 * -write_error - clears WriteErrorSeen
2977 * {,-}failfast - set/clear FailFast
2980 if (cmd_match(buf
, "faulty") && rdev
->mddev
->pers
) {
2981 md_error(rdev
->mddev
, rdev
);
2982 if (test_bit(Faulty
, &rdev
->flags
))
2986 } else if (cmd_match(buf
, "remove")) {
2987 if (rdev
->mddev
->pers
) {
2988 clear_bit(Blocked
, &rdev
->flags
);
2989 remove_and_add_spares(rdev
->mddev
, rdev
);
2991 if (rdev
->raid_disk
>= 0)
2994 struct mddev
*mddev
= rdev
->mddev
;
2996 if (mddev_is_clustered(mddev
))
2997 err
= md_cluster_ops
->remove_disk(mddev
, rdev
);
3000 md_kick_rdev_from_array(rdev
);
3002 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
3003 md_wakeup_thread(mddev
->thread
);
3005 md_new_event(mddev
);
3008 } else if (cmd_match(buf
, "writemostly")) {
3009 set_bit(WriteMostly
, &rdev
->flags
);
3010 mddev_create_serial_pool(rdev
->mddev
, rdev
, false);
3012 } else if (cmd_match(buf
, "-writemostly")) {
3013 mddev_destroy_serial_pool(rdev
->mddev
, rdev
, false);
3014 clear_bit(WriteMostly
, &rdev
->flags
);
3016 } else if (cmd_match(buf
, "blocked")) {
3017 set_bit(Blocked
, &rdev
->flags
);
3019 } else if (cmd_match(buf
, "-blocked")) {
3020 if (!test_bit(Faulty
, &rdev
->flags
) &&
3021 !test_bit(ExternalBbl
, &rdev
->flags
) &&
3022 rdev
->badblocks
.unacked_exist
) {
3023 /* metadata handler doesn't understand badblocks,
3024 * so we need to fail the device
3026 md_error(rdev
->mddev
, rdev
);
3028 clear_bit(Blocked
, &rdev
->flags
);
3029 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
3030 wake_up(&rdev
->blocked_wait
);
3031 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
3032 md_wakeup_thread(rdev
->mddev
->thread
);
3035 } else if (cmd_match(buf
, "insync") && rdev
->raid_disk
== -1) {
3036 set_bit(In_sync
, &rdev
->flags
);
3038 } else if (cmd_match(buf
, "failfast")) {
3039 set_bit(FailFast
, &rdev
->flags
);
3041 } else if (cmd_match(buf
, "-failfast")) {
3042 clear_bit(FailFast
, &rdev
->flags
);
3044 } else if (cmd_match(buf
, "-insync") && rdev
->raid_disk
>= 0 &&
3045 !test_bit(Journal
, &rdev
->flags
)) {
3046 if (rdev
->mddev
->pers
== NULL
) {
3047 clear_bit(In_sync
, &rdev
->flags
);
3048 rdev
->saved_raid_disk
= rdev
->raid_disk
;
3049 rdev
->raid_disk
= -1;
3052 } else if (cmd_match(buf
, "write_error")) {
3053 set_bit(WriteErrorSeen
, &rdev
->flags
);
3055 } else if (cmd_match(buf
, "-write_error")) {
3056 clear_bit(WriteErrorSeen
, &rdev
->flags
);
3058 } else if (cmd_match(buf
, "want_replacement")) {
3059 /* Any non-spare device that is not a replacement can
3060 * become want_replacement at any time, but we then need to
3061 * check if recovery is needed.
3063 if (rdev
->raid_disk
>= 0 &&
3064 !test_bit(Journal
, &rdev
->flags
) &&
3065 !test_bit(Replacement
, &rdev
->flags
))
3066 set_bit(WantReplacement
, &rdev
->flags
);
3067 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
3068 md_wakeup_thread(rdev
->mddev
->thread
);
3070 } else if (cmd_match(buf
, "-want_replacement")) {
3071 /* Clearing 'want_replacement' is always allowed.
3072 * Once replacements starts it is too late though.
3075 clear_bit(WantReplacement
, &rdev
->flags
);
3076 } else if (cmd_match(buf
, "replacement")) {
3077 /* Can only set a device as a replacement when array has not
3078 * yet been started. Once running, replacement is automatic
3079 * from spares, or by assigning 'slot'.
3081 if (rdev
->mddev
->pers
)
3084 set_bit(Replacement
, &rdev
->flags
);
3087 } else if (cmd_match(buf
, "-replacement")) {
3088 /* Similarly, can only clear Replacement before start */
3089 if (rdev
->mddev
->pers
)
3092 clear_bit(Replacement
, &rdev
->flags
);
3095 } else if (cmd_match(buf
, "re-add")) {
3096 if (!rdev
->mddev
->pers
)
3098 else if (test_bit(Faulty
, &rdev
->flags
) && (rdev
->raid_disk
== -1) &&
3099 rdev
->saved_raid_disk
>= 0) {
3100 /* clear_bit is performed _after_ all the devices
3101 * have their local Faulty bit cleared. If any writes
3102 * happen in the meantime in the local node, they
3103 * will land in the local bitmap, which will be synced
3104 * by this node eventually
3106 if (!mddev_is_clustered(rdev
->mddev
) ||
3107 (err
= md_cluster_ops
->gather_bitmaps(rdev
)) == 0) {
3108 clear_bit(Faulty
, &rdev
->flags
);
3109 err
= add_bound_rdev(rdev
);
3113 } else if (cmd_match(buf
, "external_bbl") && (rdev
->mddev
->external
)) {
3114 set_bit(ExternalBbl
, &rdev
->flags
);
3115 rdev
->badblocks
.shift
= 0;
3117 } else if (cmd_match(buf
, "-external_bbl") && (rdev
->mddev
->external
)) {
3118 clear_bit(ExternalBbl
, &rdev
->flags
);
3122 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
3123 return err
? err
: len
;
3125 static struct rdev_sysfs_entry rdev_state
=
3126 __ATTR_PREALLOC(state
, S_IRUGO
|S_IWUSR
, state_show
, state_store
);
3129 errors_show(struct md_rdev
*rdev
, char *page
)
3131 return sprintf(page
, "%d\n", atomic_read(&rdev
->corrected_errors
));
3135 errors_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3140 rv
= kstrtouint(buf
, 10, &n
);
3143 atomic_set(&rdev
->corrected_errors
, n
);
3146 static struct rdev_sysfs_entry rdev_errors
=
3147 __ATTR(errors
, S_IRUGO
|S_IWUSR
, errors_show
, errors_store
);
3150 slot_show(struct md_rdev
*rdev
, char *page
)
3152 if (test_bit(Journal
, &rdev
->flags
))
3153 return sprintf(page
, "journal\n");
3154 else if (rdev
->raid_disk
< 0)
3155 return sprintf(page
, "none\n");
3157 return sprintf(page
, "%d\n", rdev
->raid_disk
);
3161 slot_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3166 if (test_bit(Journal
, &rdev
->flags
))
3168 if (strncmp(buf
, "none", 4)==0)
3171 err
= kstrtouint(buf
, 10, (unsigned int *)&slot
);
3175 if (rdev
->mddev
->pers
&& slot
== -1) {
3176 /* Setting 'slot' on an active array requires also
3177 * updating the 'rd%d' link, and communicating
3178 * with the personality with ->hot_*_disk.
3179 * For now we only support removing
3180 * failed/spare devices. This normally happens automatically,
3181 * but not when the metadata is externally managed.
3183 if (rdev
->raid_disk
== -1)
3185 /* personality does all needed checks */
3186 if (rdev
->mddev
->pers
->hot_remove_disk
== NULL
)
3188 clear_bit(Blocked
, &rdev
->flags
);
3189 remove_and_add_spares(rdev
->mddev
, rdev
);
3190 if (rdev
->raid_disk
>= 0)
3192 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
3193 md_wakeup_thread(rdev
->mddev
->thread
);
3194 } else if (rdev
->mddev
->pers
) {
3195 /* Activating a spare .. or possibly reactivating
3196 * if we ever get bitmaps working here.
3200 if (rdev
->raid_disk
!= -1)
3203 if (test_bit(MD_RECOVERY_RUNNING
, &rdev
->mddev
->recovery
))
3206 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
3209 if (slot
>= rdev
->mddev
->raid_disks
&&
3210 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
3213 rdev
->raid_disk
= slot
;
3214 if (test_bit(In_sync
, &rdev
->flags
))
3215 rdev
->saved_raid_disk
= slot
;
3217 rdev
->saved_raid_disk
= -1;
3218 clear_bit(In_sync
, &rdev
->flags
);
3219 clear_bit(Bitmap_sync
, &rdev
->flags
);
3220 err
= rdev
->mddev
->pers
->hot_add_disk(rdev
->mddev
, rdev
);
3222 rdev
->raid_disk
= -1;
3225 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
3226 /* failure here is OK */;
3227 sysfs_link_rdev(rdev
->mddev
, rdev
);
3228 /* don't wakeup anyone, leave that to userspace. */
3230 if (slot
>= rdev
->mddev
->raid_disks
&&
3231 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
3233 rdev
->raid_disk
= slot
;
3234 /* assume it is working */
3235 clear_bit(Faulty
, &rdev
->flags
);
3236 clear_bit(WriteMostly
, &rdev
->flags
);
3237 set_bit(In_sync
, &rdev
->flags
);
3238 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
3243 static struct rdev_sysfs_entry rdev_slot
=
3244 __ATTR(slot
, S_IRUGO
|S_IWUSR
, slot_show
, slot_store
);
3247 offset_show(struct md_rdev
*rdev
, char *page
)
3249 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->data_offset
);
3253 offset_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3255 unsigned long long offset
;
3256 if (kstrtoull(buf
, 10, &offset
) < 0)
3258 if (rdev
->mddev
->pers
&& rdev
->raid_disk
>= 0)
3260 if (rdev
->sectors
&& rdev
->mddev
->external
)
3261 /* Must set offset before size, so overlap checks
3264 rdev
->data_offset
= offset
;
3265 rdev
->new_data_offset
= offset
;
3269 static struct rdev_sysfs_entry rdev_offset
=
3270 __ATTR(offset
, S_IRUGO
|S_IWUSR
, offset_show
, offset_store
);
3272 static ssize_t
new_offset_show(struct md_rdev
*rdev
, char *page
)
3274 return sprintf(page
, "%llu\n",
3275 (unsigned long long)rdev
->new_data_offset
);
3278 static ssize_t
new_offset_store(struct md_rdev
*rdev
,
3279 const char *buf
, size_t len
)
3281 unsigned long long new_offset
;
3282 struct mddev
*mddev
= rdev
->mddev
;
3284 if (kstrtoull(buf
, 10, &new_offset
) < 0)
3287 if (mddev
->sync_thread
||
3288 test_bit(MD_RECOVERY_RUNNING
,&mddev
->recovery
))
3290 if (new_offset
== rdev
->data_offset
)
3291 /* reset is always permitted */
3293 else if (new_offset
> rdev
->data_offset
) {
3294 /* must not push array size beyond rdev_sectors */
3295 if (new_offset
- rdev
->data_offset
3296 + mddev
->dev_sectors
> rdev
->sectors
)
3299 /* Metadata worries about other space details. */
3301 /* decreasing the offset is inconsistent with a backwards
3304 if (new_offset
< rdev
->data_offset
&&
3305 mddev
->reshape_backwards
)
3307 /* Increasing offset is inconsistent with forwards
3308 * reshape. reshape_direction should be set to
3309 * 'backwards' first.
3311 if (new_offset
> rdev
->data_offset
&&
3312 !mddev
->reshape_backwards
)
3315 if (mddev
->pers
&& mddev
->persistent
&&
3316 !super_types
[mddev
->major_version
]
3317 .allow_new_offset(rdev
, new_offset
))
3319 rdev
->new_data_offset
= new_offset
;
3320 if (new_offset
> rdev
->data_offset
)
3321 mddev
->reshape_backwards
= 1;
3322 else if (new_offset
< rdev
->data_offset
)
3323 mddev
->reshape_backwards
= 0;
3327 static struct rdev_sysfs_entry rdev_new_offset
=
3328 __ATTR(new_offset
, S_IRUGO
|S_IWUSR
, new_offset_show
, new_offset_store
);
3331 rdev_size_show(struct md_rdev
*rdev
, char *page
)
3333 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->sectors
/ 2);
3336 static int overlaps(sector_t s1
, sector_t l1
, sector_t s2
, sector_t l2
)
3338 /* check if two start/length pairs overlap */
3346 static int strict_blocks_to_sectors(const char *buf
, sector_t
*sectors
)
3348 unsigned long long blocks
;
3351 if (kstrtoull(buf
, 10, &blocks
) < 0)
3354 if (blocks
& 1ULL << (8 * sizeof(blocks
) - 1))
3355 return -EINVAL
; /* sector conversion overflow */
3358 if (new != blocks
* 2)
3359 return -EINVAL
; /* unsigned long long to sector_t overflow */
3366 rdev_size_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3368 struct mddev
*my_mddev
= rdev
->mddev
;
3369 sector_t oldsectors
= rdev
->sectors
;
3372 if (test_bit(Journal
, &rdev
->flags
))
3374 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
3376 if (rdev
->data_offset
!= rdev
->new_data_offset
)
3377 return -EINVAL
; /* too confusing */
3378 if (my_mddev
->pers
&& rdev
->raid_disk
>= 0) {
3379 if (my_mddev
->persistent
) {
3380 sectors
= super_types
[my_mddev
->major_version
].
3381 rdev_size_change(rdev
, sectors
);
3384 } else if (!sectors
)
3385 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) -
3387 if (!my_mddev
->pers
->resize
)
3388 /* Cannot change size for RAID0 or Linear etc */
3391 if (sectors
< my_mddev
->dev_sectors
)
3392 return -EINVAL
; /* component must fit device */
3394 rdev
->sectors
= sectors
;
3395 if (sectors
> oldsectors
&& my_mddev
->external
) {
3396 /* Need to check that all other rdevs with the same
3397 * ->bdev do not overlap. 'rcu' is sufficient to walk
3398 * the rdev lists safely.
3399 * This check does not provide a hard guarantee, it
3400 * just helps avoid dangerous mistakes.
3402 struct mddev
*mddev
;
3404 struct list_head
*tmp
;
3407 for_each_mddev(mddev
, tmp
) {
3408 struct md_rdev
*rdev2
;
3410 rdev_for_each(rdev2
, mddev
)
3411 if (rdev
->bdev
== rdev2
->bdev
&&
3413 overlaps(rdev
->data_offset
, rdev
->sectors
,
3426 /* Someone else could have slipped in a size
3427 * change here, but doing so is just silly.
3428 * We put oldsectors back because we *know* it is
3429 * safe, and trust userspace not to race with
3432 rdev
->sectors
= oldsectors
;
3439 static struct rdev_sysfs_entry rdev_size
=
3440 __ATTR(size
, S_IRUGO
|S_IWUSR
, rdev_size_show
, rdev_size_store
);
3442 static ssize_t
recovery_start_show(struct md_rdev
*rdev
, char *page
)
3444 unsigned long long recovery_start
= rdev
->recovery_offset
;
3446 if (test_bit(In_sync
, &rdev
->flags
) ||
3447 recovery_start
== MaxSector
)
3448 return sprintf(page
, "none\n");
3450 return sprintf(page
, "%llu\n", recovery_start
);
3453 static ssize_t
recovery_start_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3455 unsigned long long recovery_start
;
3457 if (cmd_match(buf
, "none"))
3458 recovery_start
= MaxSector
;
3459 else if (kstrtoull(buf
, 10, &recovery_start
))
3462 if (rdev
->mddev
->pers
&&
3463 rdev
->raid_disk
>= 0)
3466 rdev
->recovery_offset
= recovery_start
;
3467 if (recovery_start
== MaxSector
)
3468 set_bit(In_sync
, &rdev
->flags
);
3470 clear_bit(In_sync
, &rdev
->flags
);
3474 static struct rdev_sysfs_entry rdev_recovery_start
=
3475 __ATTR(recovery_start
, S_IRUGO
|S_IWUSR
, recovery_start_show
, recovery_start_store
);
3477 /* sysfs access to bad-blocks list.
3478 * We present two files.
3479 * 'bad-blocks' lists sector numbers and lengths of ranges that
3480 * are recorded as bad. The list is truncated to fit within
3481 * the one-page limit of sysfs.
3482 * Writing "sector length" to this file adds an acknowledged
3484 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
3485 * been acknowledged. Writing to this file adds bad blocks
3486 * without acknowledging them. This is largely for testing.
3488 static ssize_t
bb_show(struct md_rdev
*rdev
, char *page
)
3490 return badblocks_show(&rdev
->badblocks
, page
, 0);
3492 static ssize_t
bb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
3494 int rv
= badblocks_store(&rdev
->badblocks
, page
, len
, 0);
3495 /* Maybe that ack was all we needed */
3496 if (test_and_clear_bit(BlockedBadBlocks
, &rdev
->flags
))
3497 wake_up(&rdev
->blocked_wait
);
3500 static struct rdev_sysfs_entry rdev_bad_blocks
=
3501 __ATTR(bad_blocks
, S_IRUGO
|S_IWUSR
, bb_show
, bb_store
);
3503 static ssize_t
ubb_show(struct md_rdev
*rdev
, char *page
)
3505 return badblocks_show(&rdev
->badblocks
, page
, 1);
3507 static ssize_t
ubb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
3509 return badblocks_store(&rdev
->badblocks
, page
, len
, 1);
3511 static struct rdev_sysfs_entry rdev_unack_bad_blocks
=
3512 __ATTR(unacknowledged_bad_blocks
, S_IRUGO
|S_IWUSR
, ubb_show
, ubb_store
);
3515 ppl_sector_show(struct md_rdev
*rdev
, char *page
)
3517 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->ppl
.sector
);
3521 ppl_sector_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3523 unsigned long long sector
;
3525 if (kstrtoull(buf
, 10, §or
) < 0)
3527 if (sector
!= (sector_t
)sector
)
3530 if (rdev
->mddev
->pers
&& test_bit(MD_HAS_PPL
, &rdev
->mddev
->flags
) &&
3531 rdev
->raid_disk
>= 0)
3534 if (rdev
->mddev
->persistent
) {
3535 if (rdev
->mddev
->major_version
== 0)
3537 if ((sector
> rdev
->sb_start
&&
3538 sector
- rdev
->sb_start
> S16_MAX
) ||
3539 (sector
< rdev
->sb_start
&&
3540 rdev
->sb_start
- sector
> -S16_MIN
))
3542 rdev
->ppl
.offset
= sector
- rdev
->sb_start
;
3543 } else if (!rdev
->mddev
->external
) {
3546 rdev
->ppl
.sector
= sector
;
3550 static struct rdev_sysfs_entry rdev_ppl_sector
=
3551 __ATTR(ppl_sector
, S_IRUGO
|S_IWUSR
, ppl_sector_show
, ppl_sector_store
);
3554 ppl_size_show(struct md_rdev
*rdev
, char *page
)
3556 return sprintf(page
, "%u\n", rdev
->ppl
.size
);
3560 ppl_size_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3564 if (kstrtouint(buf
, 10, &size
) < 0)
3567 if (rdev
->mddev
->pers
&& test_bit(MD_HAS_PPL
, &rdev
->mddev
->flags
) &&
3568 rdev
->raid_disk
>= 0)
3571 if (rdev
->mddev
->persistent
) {
3572 if (rdev
->mddev
->major_version
== 0)
3576 } else if (!rdev
->mddev
->external
) {
3579 rdev
->ppl
.size
= size
;
3583 static struct rdev_sysfs_entry rdev_ppl_size
=
3584 __ATTR(ppl_size
, S_IRUGO
|S_IWUSR
, ppl_size_show
, ppl_size_store
);
3586 static struct attribute
*rdev_default_attrs
[] = {
3591 &rdev_new_offset
.attr
,
3593 &rdev_recovery_start
.attr
,
3594 &rdev_bad_blocks
.attr
,
3595 &rdev_unack_bad_blocks
.attr
,
3596 &rdev_ppl_sector
.attr
,
3597 &rdev_ppl_size
.attr
,
3601 rdev_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
3603 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
3604 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
3610 return entry
->show(rdev
, page
);
3614 rdev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
3615 const char *page
, size_t length
)
3617 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
3618 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
3620 struct mddev
*mddev
= rdev
->mddev
;
3624 if (!capable(CAP_SYS_ADMIN
))
3626 rv
= mddev
? mddev_lock(mddev
) : -ENODEV
;
3628 if (rdev
->mddev
== NULL
)
3631 rv
= entry
->store(rdev
, page
, length
);
3632 mddev_unlock(mddev
);
3637 static void rdev_free(struct kobject
*ko
)
3639 struct md_rdev
*rdev
= container_of(ko
, struct md_rdev
, kobj
);
3642 static const struct sysfs_ops rdev_sysfs_ops
= {
3643 .show
= rdev_attr_show
,
3644 .store
= rdev_attr_store
,
3646 static struct kobj_type rdev_ktype
= {
3647 .release
= rdev_free
,
3648 .sysfs_ops
= &rdev_sysfs_ops
,
3649 .default_attrs
= rdev_default_attrs
,
3652 int md_rdev_init(struct md_rdev
*rdev
)
3655 rdev
->saved_raid_disk
= -1;
3656 rdev
->raid_disk
= -1;
3658 rdev
->data_offset
= 0;
3659 rdev
->new_data_offset
= 0;
3660 rdev
->sb_events
= 0;
3661 rdev
->last_read_error
= 0;
3662 rdev
->sb_loaded
= 0;
3663 rdev
->bb_page
= NULL
;
3664 atomic_set(&rdev
->nr_pending
, 0);
3665 atomic_set(&rdev
->read_errors
, 0);
3666 atomic_set(&rdev
->corrected_errors
, 0);
3668 INIT_LIST_HEAD(&rdev
->same_set
);
3669 init_waitqueue_head(&rdev
->blocked_wait
);
3671 /* Add space to store bad block list.
3672 * This reserves the space even on arrays where it cannot
3673 * be used - I wonder if that matters
3675 return badblocks_init(&rdev
->badblocks
, 0);
3677 EXPORT_SYMBOL_GPL(md_rdev_init
);
3679 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3681 * mark the device faulty if:
3683 * - the device is nonexistent (zero size)
3684 * - the device has no valid superblock
3686 * a faulty rdev _never_ has rdev->sb set.
3688 static struct md_rdev
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
3690 char b
[BDEVNAME_SIZE
];
3692 struct md_rdev
*rdev
;
3695 rdev
= kzalloc(sizeof(*rdev
), GFP_KERNEL
);
3697 return ERR_PTR(-ENOMEM
);
3699 err
= md_rdev_init(rdev
);
3702 err
= alloc_disk_sb(rdev
);
3706 err
= lock_rdev(rdev
, newdev
, super_format
== -2);
3710 kobject_init(&rdev
->kobj
, &rdev_ktype
);
3712 size
= i_size_read(rdev
->bdev
->bd_inode
) >> BLOCK_SIZE_BITS
;
3714 pr_warn("md: %s has zero or unknown size, marking faulty!\n",
3715 bdevname(rdev
->bdev
,b
));
3720 if (super_format
>= 0) {
3721 err
= super_types
[super_format
].
3722 load_super(rdev
, NULL
, super_minor
);
3723 if (err
== -EINVAL
) {
3724 pr_warn("md: %s does not have a valid v%d.%d superblock, not importing!\n",
3725 bdevname(rdev
->bdev
,b
),
3726 super_format
, super_minor
);
3730 pr_warn("md: could not read %s's sb, not importing!\n",
3731 bdevname(rdev
->bdev
,b
));
3741 md_rdev_clear(rdev
);
3743 return ERR_PTR(err
);
3747 * Check a full RAID array for plausibility
3750 static int analyze_sbs(struct mddev
*mddev
)
3753 struct md_rdev
*rdev
, *freshest
, *tmp
;
3754 char b
[BDEVNAME_SIZE
];
3757 rdev_for_each_safe(rdev
, tmp
, mddev
)
3758 switch (super_types
[mddev
->major_version
].
3759 load_super(rdev
, freshest
, mddev
->minor_version
)) {
3766 pr_warn("md: fatal superblock inconsistency in %s -- removing from array\n",
3767 bdevname(rdev
->bdev
,b
));
3768 md_kick_rdev_from_array(rdev
);
3771 /* Cannot find a valid fresh disk */
3773 pr_warn("md: cannot find a valid disk\n");
3777 super_types
[mddev
->major_version
].
3778 validate_super(mddev
, freshest
);
3781 rdev_for_each_safe(rdev
, tmp
, mddev
) {
3782 if (mddev
->max_disks
&&
3783 (rdev
->desc_nr
>= mddev
->max_disks
||
3784 i
> mddev
->max_disks
)) {
3785 pr_warn("md: %s: %s: only %d devices permitted\n",
3786 mdname(mddev
), bdevname(rdev
->bdev
, b
),
3788 md_kick_rdev_from_array(rdev
);
3791 if (rdev
!= freshest
) {
3792 if (super_types
[mddev
->major_version
].
3793 validate_super(mddev
, rdev
)) {
3794 pr_warn("md: kicking non-fresh %s from array!\n",
3795 bdevname(rdev
->bdev
,b
));
3796 md_kick_rdev_from_array(rdev
);
3800 if (mddev
->level
== LEVEL_MULTIPATH
) {
3801 rdev
->desc_nr
= i
++;
3802 rdev
->raid_disk
= rdev
->desc_nr
;
3803 set_bit(In_sync
, &rdev
->flags
);
3804 } else if (rdev
->raid_disk
>=
3805 (mddev
->raid_disks
- min(0, mddev
->delta_disks
)) &&
3806 !test_bit(Journal
, &rdev
->flags
)) {
3807 rdev
->raid_disk
= -1;
3808 clear_bit(In_sync
, &rdev
->flags
);
3815 /* Read a fixed-point number.
3816 * Numbers in sysfs attributes should be in "standard" units where
3817 * possible, so time should be in seconds.
3818 * However we internally use a a much smaller unit such as
3819 * milliseconds or jiffies.
3820 * This function takes a decimal number with a possible fractional
3821 * component, and produces an integer which is the result of
3822 * multiplying that number by 10^'scale'.
3823 * all without any floating-point arithmetic.
3825 int strict_strtoul_scaled(const char *cp
, unsigned long *res
, int scale
)
3827 unsigned long result
= 0;
3829 while (isdigit(*cp
) || (*cp
== '.' && decimals
< 0)) {
3832 else if (decimals
< scale
) {
3835 result
= result
* 10 + value
;
3847 *res
= result
* int_pow(10, scale
- decimals
);
3852 safe_delay_show(struct mddev
*mddev
, char *page
)
3854 int msec
= (mddev
->safemode_delay
*1000)/HZ
;
3855 return sprintf(page
, "%d.%03d\n", msec
/1000, msec
%1000);
3858 safe_delay_store(struct mddev
*mddev
, const char *cbuf
, size_t len
)
3862 if (mddev_is_clustered(mddev
)) {
3863 pr_warn("md: Safemode is disabled for clustered mode\n");
3867 if (strict_strtoul_scaled(cbuf
, &msec
, 3) < 0)
3870 mddev
->safemode_delay
= 0;
3872 unsigned long old_delay
= mddev
->safemode_delay
;
3873 unsigned long new_delay
= (msec
*HZ
)/1000;
3877 mddev
->safemode_delay
= new_delay
;
3878 if (new_delay
< old_delay
|| old_delay
== 0)
3879 mod_timer(&mddev
->safemode_timer
, jiffies
+1);
3883 static struct md_sysfs_entry md_safe_delay
=
3884 __ATTR(safe_mode_delay
, S_IRUGO
|S_IWUSR
,safe_delay_show
, safe_delay_store
);
3887 level_show(struct mddev
*mddev
, char *page
)
3889 struct md_personality
*p
;
3891 spin_lock(&mddev
->lock
);
3894 ret
= sprintf(page
, "%s\n", p
->name
);
3895 else if (mddev
->clevel
[0])
3896 ret
= sprintf(page
, "%s\n", mddev
->clevel
);
3897 else if (mddev
->level
!= LEVEL_NONE
)
3898 ret
= sprintf(page
, "%d\n", mddev
->level
);
3901 spin_unlock(&mddev
->lock
);
3906 level_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3911 struct md_personality
*pers
, *oldpers
;
3913 void *priv
, *oldpriv
;
3914 struct md_rdev
*rdev
;
3916 if (slen
== 0 || slen
>= sizeof(clevel
))
3919 rv
= mddev_lock(mddev
);
3923 if (mddev
->pers
== NULL
) {
3924 strncpy(mddev
->clevel
, buf
, slen
);
3925 if (mddev
->clevel
[slen
-1] == '\n')
3927 mddev
->clevel
[slen
] = 0;
3928 mddev
->level
= LEVEL_NONE
;
3936 /* request to change the personality. Need to ensure:
3937 * - array is not engaged in resync/recovery/reshape
3938 * - old personality can be suspended
3939 * - new personality will access other array.
3943 if (mddev
->sync_thread
||
3944 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
3945 mddev
->reshape_position
!= MaxSector
||
3946 mddev
->sysfs_active
)
3950 if (!mddev
->pers
->quiesce
) {
3951 pr_warn("md: %s: %s does not support online personality change\n",
3952 mdname(mddev
), mddev
->pers
->name
);
3956 /* Now find the new personality */
3957 strncpy(clevel
, buf
, slen
);
3958 if (clevel
[slen
-1] == '\n')
3961 if (kstrtol(clevel
, 10, &level
))
3964 if (request_module("md-%s", clevel
) != 0)
3965 request_module("md-level-%s", clevel
);
3966 spin_lock(&pers_lock
);
3967 pers
= find_pers(level
, clevel
);
3968 if (!pers
|| !try_module_get(pers
->owner
)) {
3969 spin_unlock(&pers_lock
);
3970 pr_warn("md: personality %s not loaded\n", clevel
);
3974 spin_unlock(&pers_lock
);
3976 if (pers
== mddev
->pers
) {
3977 /* Nothing to do! */
3978 module_put(pers
->owner
);
3982 if (!pers
->takeover
) {
3983 module_put(pers
->owner
);
3984 pr_warn("md: %s: %s does not support personality takeover\n",
3985 mdname(mddev
), clevel
);
3990 rdev_for_each(rdev
, mddev
)
3991 rdev
->new_raid_disk
= rdev
->raid_disk
;
3993 /* ->takeover must set new_* and/or delta_disks
3994 * if it succeeds, and may set them when it fails.
3996 priv
= pers
->takeover(mddev
);
3998 mddev
->new_level
= mddev
->level
;
3999 mddev
->new_layout
= mddev
->layout
;
4000 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
4001 mddev
->raid_disks
-= mddev
->delta_disks
;
4002 mddev
->delta_disks
= 0;
4003 mddev
->reshape_backwards
= 0;
4004 module_put(pers
->owner
);
4005 pr_warn("md: %s: %s would not accept array\n",
4006 mdname(mddev
), clevel
);
4011 /* Looks like we have a winner */
4012 mddev_suspend(mddev
);
4013 mddev_detach(mddev
);
4015 spin_lock(&mddev
->lock
);
4016 oldpers
= mddev
->pers
;
4017 oldpriv
= mddev
->private;
4019 mddev
->private = priv
;
4020 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
4021 mddev
->level
= mddev
->new_level
;
4022 mddev
->layout
= mddev
->new_layout
;
4023 mddev
->chunk_sectors
= mddev
->new_chunk_sectors
;
4024 mddev
->delta_disks
= 0;
4025 mddev
->reshape_backwards
= 0;
4026 mddev
->degraded
= 0;
4027 spin_unlock(&mddev
->lock
);
4029 if (oldpers
->sync_request
== NULL
&&
4031 /* We are converting from a no-redundancy array
4032 * to a redundancy array and metadata is managed
4033 * externally so we need to be sure that writes
4034 * won't block due to a need to transition
4036 * until external management is started.
4039 mddev
->safemode_delay
= 0;
4040 mddev
->safemode
= 0;
4043 oldpers
->free(mddev
, oldpriv
);
4045 if (oldpers
->sync_request
== NULL
&&
4046 pers
->sync_request
!= NULL
) {
4047 /* need to add the md_redundancy_group */
4048 if (sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
4049 pr_warn("md: cannot register extra attributes for %s\n",
4051 mddev
->sysfs_action
= sysfs_get_dirent(mddev
->kobj
.sd
, "sync_action");
4052 mddev
->sysfs_completed
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "sync_completed");
4053 mddev
->sysfs_degraded
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "degraded");
4055 if (oldpers
->sync_request
!= NULL
&&
4056 pers
->sync_request
== NULL
) {
4057 /* need to remove the md_redundancy_group */
4058 if (mddev
->to_remove
== NULL
)
4059 mddev
->to_remove
= &md_redundancy_group
;
4062 module_put(oldpers
->owner
);
4064 rdev_for_each(rdev
, mddev
) {
4065 if (rdev
->raid_disk
< 0)
4067 if (rdev
->new_raid_disk
>= mddev
->raid_disks
)
4068 rdev
->new_raid_disk
= -1;
4069 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
4071 sysfs_unlink_rdev(mddev
, rdev
);
4073 rdev_for_each(rdev
, mddev
) {
4074 if (rdev
->raid_disk
< 0)
4076 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
4078 rdev
->raid_disk
= rdev
->new_raid_disk
;
4079 if (rdev
->raid_disk
< 0)
4080 clear_bit(In_sync
, &rdev
->flags
);
4082 if (sysfs_link_rdev(mddev
, rdev
))
4083 pr_warn("md: cannot register rd%d for %s after level change\n",
4084 rdev
->raid_disk
, mdname(mddev
));
4088 if (pers
->sync_request
== NULL
) {
4089 /* this is now an array without redundancy, so
4090 * it must always be in_sync
4093 del_timer_sync(&mddev
->safemode_timer
);
4095 blk_set_stacking_limits(&mddev
->queue
->limits
);
4097 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
4098 mddev_resume(mddev
);
4100 md_update_sb(mddev
, 1);
4101 sysfs_notify_dirent_safe(mddev
->sysfs_level
);
4102 md_new_event(mddev
);
4105 mddev_unlock(mddev
);
4109 static struct md_sysfs_entry md_level
=
4110 __ATTR(level
, S_IRUGO
|S_IWUSR
, level_show
, level_store
);
4113 layout_show(struct mddev
*mddev
, char *page
)
4115 /* just a number, not meaningful for all levels */
4116 if (mddev
->reshape_position
!= MaxSector
&&
4117 mddev
->layout
!= mddev
->new_layout
)
4118 return sprintf(page
, "%d (%d)\n",
4119 mddev
->new_layout
, mddev
->layout
);
4120 return sprintf(page
, "%d\n", mddev
->layout
);
4124 layout_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4129 err
= kstrtouint(buf
, 10, &n
);
4132 err
= mddev_lock(mddev
);
4137 if (mddev
->pers
->check_reshape
== NULL
)
4142 mddev
->new_layout
= n
;
4143 err
= mddev
->pers
->check_reshape(mddev
);
4145 mddev
->new_layout
= mddev
->layout
;
4148 mddev
->new_layout
= n
;
4149 if (mddev
->reshape_position
== MaxSector
)
4152 mddev_unlock(mddev
);
4155 static struct md_sysfs_entry md_layout
=
4156 __ATTR(layout
, S_IRUGO
|S_IWUSR
, layout_show
, layout_store
);
4159 raid_disks_show(struct mddev
*mddev
, char *page
)
4161 if (mddev
->raid_disks
== 0)
4163 if (mddev
->reshape_position
!= MaxSector
&&
4164 mddev
->delta_disks
!= 0)
4165 return sprintf(page
, "%d (%d)\n", mddev
->raid_disks
,
4166 mddev
->raid_disks
- mddev
->delta_disks
);
4167 return sprintf(page
, "%d\n", mddev
->raid_disks
);
4170 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
);
4173 raid_disks_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4178 err
= kstrtouint(buf
, 10, &n
);
4182 err
= mddev_lock(mddev
);
4186 err
= update_raid_disks(mddev
, n
);
4187 else if (mddev
->reshape_position
!= MaxSector
) {
4188 struct md_rdev
*rdev
;
4189 int olddisks
= mddev
->raid_disks
- mddev
->delta_disks
;
4192 rdev_for_each(rdev
, mddev
) {
4194 rdev
->data_offset
< rdev
->new_data_offset
)
4197 rdev
->data_offset
> rdev
->new_data_offset
)
4201 mddev
->delta_disks
= n
- olddisks
;
4202 mddev
->raid_disks
= n
;
4203 mddev
->reshape_backwards
= (mddev
->delta_disks
< 0);
4205 mddev
->raid_disks
= n
;
4207 mddev_unlock(mddev
);
4208 return err
? err
: len
;
4210 static struct md_sysfs_entry md_raid_disks
=
4211 __ATTR(raid_disks
, S_IRUGO
|S_IWUSR
, raid_disks_show
, raid_disks_store
);
4214 uuid_show(struct mddev
*mddev
, char *page
)
4216 return sprintf(page
, "%pU\n", mddev
->uuid
);
4218 static struct md_sysfs_entry md_uuid
=
4219 __ATTR(uuid
, S_IRUGO
, uuid_show
, NULL
);
4222 chunk_size_show(struct mddev
*mddev
, char *page
)
4224 if (mddev
->reshape_position
!= MaxSector
&&
4225 mddev
->chunk_sectors
!= mddev
->new_chunk_sectors
)
4226 return sprintf(page
, "%d (%d)\n",
4227 mddev
->new_chunk_sectors
<< 9,
4228 mddev
->chunk_sectors
<< 9);
4229 return sprintf(page
, "%d\n", mddev
->chunk_sectors
<< 9);
4233 chunk_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4238 err
= kstrtoul(buf
, 10, &n
);
4242 err
= mddev_lock(mddev
);
4246 if (mddev
->pers
->check_reshape
== NULL
)
4251 mddev
->new_chunk_sectors
= n
>> 9;
4252 err
= mddev
->pers
->check_reshape(mddev
);
4254 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
4257 mddev
->new_chunk_sectors
= n
>> 9;
4258 if (mddev
->reshape_position
== MaxSector
)
4259 mddev
->chunk_sectors
= n
>> 9;
4261 mddev_unlock(mddev
);
4264 static struct md_sysfs_entry md_chunk_size
=
4265 __ATTR(chunk_size
, S_IRUGO
|S_IWUSR
, chunk_size_show
, chunk_size_store
);
4268 resync_start_show(struct mddev
*mddev
, char *page
)
4270 if (mddev
->recovery_cp
== MaxSector
)
4271 return sprintf(page
, "none\n");
4272 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->recovery_cp
);
4276 resync_start_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4278 unsigned long long n
;
4281 if (cmd_match(buf
, "none"))
4284 err
= kstrtoull(buf
, 10, &n
);
4287 if (n
!= (sector_t
)n
)
4291 err
= mddev_lock(mddev
);
4294 if (mddev
->pers
&& !test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
4298 mddev
->recovery_cp
= n
;
4300 set_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
4302 mddev_unlock(mddev
);
4305 static struct md_sysfs_entry md_resync_start
=
4306 __ATTR_PREALLOC(resync_start
, S_IRUGO
|S_IWUSR
,
4307 resync_start_show
, resync_start_store
);
4310 * The array state can be:
4313 * No devices, no size, no level
4314 * Equivalent to STOP_ARRAY ioctl
4316 * May have some settings, but array is not active
4317 * all IO results in error
4318 * When written, doesn't tear down array, but just stops it
4319 * suspended (not supported yet)
4320 * All IO requests will block. The array can be reconfigured.
4321 * Writing this, if accepted, will block until array is quiescent
4323 * no resync can happen. no superblocks get written.
4324 * write requests fail
4326 * like readonly, but behaves like 'clean' on a write request.
4328 * clean - no pending writes, but otherwise active.
4329 * When written to inactive array, starts without resync
4330 * If a write request arrives then
4331 * if metadata is known, mark 'dirty' and switch to 'active'.
4332 * if not known, block and switch to write-pending
4333 * If written to an active array that has pending writes, then fails.
4335 * fully active: IO and resync can be happening.
4336 * When written to inactive array, starts with resync
4339 * clean, but writes are blocked waiting for 'active' to be written.
4342 * like active, but no writes have been seen for a while (100msec).
4345 * RAID0/LINEAR-only: same as clean, but array is missing a member.
4346 * It's useful because RAID0/LINEAR mounted-arrays aren't stopped
4347 * when a member is gone, so this state will at least alert the
4348 * user that something is wrong.
4350 enum array_state
{ clear
, inactive
, suspended
, readonly
, read_auto
, clean
, active
,
4351 write_pending
, active_idle
, broken
, bad_word
};
4352 static char *array_states
[] = {
4353 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
4354 "write-pending", "active-idle", "broken", NULL
};
4356 static int match_word(const char *word
, char **list
)
4359 for (n
=0; list
[n
]; n
++)
4360 if (cmd_match(word
, list
[n
]))
4366 array_state_show(struct mddev
*mddev
, char *page
)
4368 enum array_state st
= inactive
;
4370 if (mddev
->pers
&& !test_bit(MD_NOT_READY
, &mddev
->flags
)) {
4379 spin_lock(&mddev
->lock
);
4380 if (test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
))
4382 else if (mddev
->in_sync
)
4384 else if (mddev
->safemode
)
4388 spin_unlock(&mddev
->lock
);
4391 if (test_bit(MD_BROKEN
, &mddev
->flags
) && st
== clean
)
4394 if (list_empty(&mddev
->disks
) &&
4395 mddev
->raid_disks
== 0 &&
4396 mddev
->dev_sectors
== 0)
4401 return sprintf(page
, "%s\n", array_states
[st
]);
4404 static int do_md_stop(struct mddev
*mddev
, int ro
, struct block_device
*bdev
);
4405 static int md_set_readonly(struct mddev
*mddev
, struct block_device
*bdev
);
4406 static int restart_array(struct mddev
*mddev
);
4409 array_state_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4412 enum array_state st
= match_word(buf
, array_states
);
4414 if (mddev
->pers
&& (st
== active
|| st
== clean
) && mddev
->ro
!= 1) {
4415 /* don't take reconfig_mutex when toggling between
4418 spin_lock(&mddev
->lock
);
4420 restart_array(mddev
);
4421 clear_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
4422 md_wakeup_thread(mddev
->thread
);
4423 wake_up(&mddev
->sb_wait
);
4424 } else /* st == clean */ {
4425 restart_array(mddev
);
4426 if (!set_in_sync(mddev
))
4430 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4431 spin_unlock(&mddev
->lock
);
4434 err
= mddev_lock(mddev
);
4442 /* stopping an active array */
4443 err
= do_md_stop(mddev
, 0, NULL
);
4446 /* stopping an active array */
4448 err
= do_md_stop(mddev
, 2, NULL
);
4450 err
= 0; /* already inactive */
4453 break; /* not supported yet */
4456 err
= md_set_readonly(mddev
, NULL
);
4459 set_disk_ro(mddev
->gendisk
, 1);
4460 err
= do_md_run(mddev
);
4466 err
= md_set_readonly(mddev
, NULL
);
4467 else if (mddev
->ro
== 1)
4468 err
= restart_array(mddev
);
4471 set_disk_ro(mddev
->gendisk
, 0);
4475 err
= do_md_run(mddev
);
4480 err
= restart_array(mddev
);
4483 spin_lock(&mddev
->lock
);
4484 if (!set_in_sync(mddev
))
4486 spin_unlock(&mddev
->lock
);
4492 err
= restart_array(mddev
);
4495 clear_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
4496 wake_up(&mddev
->sb_wait
);
4500 set_disk_ro(mddev
->gendisk
, 0);
4501 err
= do_md_run(mddev
);
4507 /* these cannot be set */
4512 if (mddev
->hold_active
== UNTIL_IOCTL
)
4513 mddev
->hold_active
= 0;
4514 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4516 mddev_unlock(mddev
);
4519 static struct md_sysfs_entry md_array_state
=
4520 __ATTR_PREALLOC(array_state
, S_IRUGO
|S_IWUSR
, array_state_show
, array_state_store
);
4523 max_corrected_read_errors_show(struct mddev
*mddev
, char *page
) {
4524 return sprintf(page
, "%d\n",
4525 atomic_read(&mddev
->max_corr_read_errors
));
4529 max_corrected_read_errors_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4534 rv
= kstrtouint(buf
, 10, &n
);
4537 atomic_set(&mddev
->max_corr_read_errors
, n
);
4541 static struct md_sysfs_entry max_corr_read_errors
=
4542 __ATTR(max_read_errors
, S_IRUGO
|S_IWUSR
, max_corrected_read_errors_show
,
4543 max_corrected_read_errors_store
);
4546 null_show(struct mddev
*mddev
, char *page
)
4551 /* need to ensure rdev_delayed_delete() has completed */
4552 static void flush_rdev_wq(struct mddev
*mddev
)
4554 struct md_rdev
*rdev
;
4557 rdev_for_each_rcu(rdev
, mddev
)
4558 if (work_pending(&rdev
->del_work
)) {
4559 flush_workqueue(md_rdev_misc_wq
);
4566 new_dev_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4568 /* buf must be %d:%d\n? giving major and minor numbers */
4569 /* The new device is added to the array.
4570 * If the array has a persistent superblock, we read the
4571 * superblock to initialise info and check validity.
4572 * Otherwise, only checking done is that in bind_rdev_to_array,
4573 * which mainly checks size.
4576 int major
= simple_strtoul(buf
, &e
, 10);
4579 struct md_rdev
*rdev
;
4582 if (!*buf
|| *e
!= ':' || !e
[1] || e
[1] == '\n')
4584 minor
= simple_strtoul(e
+1, &e
, 10);
4585 if (*e
&& *e
!= '\n')
4587 dev
= MKDEV(major
, minor
);
4588 if (major
!= MAJOR(dev
) ||
4589 minor
!= MINOR(dev
))
4592 flush_rdev_wq(mddev
);
4593 err
= mddev_lock(mddev
);
4596 if (mddev
->persistent
) {
4597 rdev
= md_import_device(dev
, mddev
->major_version
,
4598 mddev
->minor_version
);
4599 if (!IS_ERR(rdev
) && !list_empty(&mddev
->disks
)) {
4600 struct md_rdev
*rdev0
4601 = list_entry(mddev
->disks
.next
,
4602 struct md_rdev
, same_set
);
4603 err
= super_types
[mddev
->major_version
]
4604 .load_super(rdev
, rdev0
, mddev
->minor_version
);
4608 } else if (mddev
->external
)
4609 rdev
= md_import_device(dev
, -2, -1);
4611 rdev
= md_import_device(dev
, -1, -1);
4614 mddev_unlock(mddev
);
4615 return PTR_ERR(rdev
);
4617 err
= bind_rdev_to_array(rdev
, mddev
);
4621 mddev_unlock(mddev
);
4623 md_new_event(mddev
);
4624 return err
? err
: len
;
4627 static struct md_sysfs_entry md_new_device
=
4628 __ATTR(new_dev
, S_IWUSR
, null_show
, new_dev_store
);
4631 bitmap_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4634 unsigned long chunk
, end_chunk
;
4637 err
= mddev_lock(mddev
);
4642 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
4644 chunk
= end_chunk
= simple_strtoul(buf
, &end
, 0);
4645 if (buf
== end
) break;
4646 if (*end
== '-') { /* range */
4648 end_chunk
= simple_strtoul(buf
, &end
, 0);
4649 if (buf
== end
) break;
4651 if (*end
&& !isspace(*end
)) break;
4652 md_bitmap_dirty_bits(mddev
->bitmap
, chunk
, end_chunk
);
4653 buf
= skip_spaces(end
);
4655 md_bitmap_unplug(mddev
->bitmap
); /* flush the bits to disk */
4657 mddev_unlock(mddev
);
4661 static struct md_sysfs_entry md_bitmap
=
4662 __ATTR(bitmap_set_bits
, S_IWUSR
, null_show
, bitmap_store
);
4665 size_show(struct mddev
*mddev
, char *page
)
4667 return sprintf(page
, "%llu\n",
4668 (unsigned long long)mddev
->dev_sectors
/ 2);
4671 static int update_size(struct mddev
*mddev
, sector_t num_sectors
);
4674 size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4676 /* If array is inactive, we can reduce the component size, but
4677 * not increase it (except from 0).
4678 * If array is active, we can try an on-line resize
4681 int err
= strict_blocks_to_sectors(buf
, §ors
);
4685 err
= mddev_lock(mddev
);
4689 err
= update_size(mddev
, sectors
);
4691 md_update_sb(mddev
, 1);
4693 if (mddev
->dev_sectors
== 0 ||
4694 mddev
->dev_sectors
> sectors
)
4695 mddev
->dev_sectors
= sectors
;
4699 mddev_unlock(mddev
);
4700 return err
? err
: len
;
4703 static struct md_sysfs_entry md_size
=
4704 __ATTR(component_size
, S_IRUGO
|S_IWUSR
, size_show
, size_store
);
4706 /* Metadata version.
4708 * 'none' for arrays with no metadata (good luck...)
4709 * 'external' for arrays with externally managed metadata,
4710 * or N.M for internally known formats
4713 metadata_show(struct mddev
*mddev
, char *page
)
4715 if (mddev
->persistent
)
4716 return sprintf(page
, "%d.%d\n",
4717 mddev
->major_version
, mddev
->minor_version
);
4718 else if (mddev
->external
)
4719 return sprintf(page
, "external:%s\n", mddev
->metadata_type
);
4721 return sprintf(page
, "none\n");
4725 metadata_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4730 /* Changing the details of 'external' metadata is
4731 * always permitted. Otherwise there must be
4732 * no devices attached to the array.
4735 err
= mddev_lock(mddev
);
4739 if (mddev
->external
&& strncmp(buf
, "external:", 9) == 0)
4741 else if (!list_empty(&mddev
->disks
))
4745 if (cmd_match(buf
, "none")) {
4746 mddev
->persistent
= 0;
4747 mddev
->external
= 0;
4748 mddev
->major_version
= 0;
4749 mddev
->minor_version
= 90;
4752 if (strncmp(buf
, "external:", 9) == 0) {
4753 size_t namelen
= len
-9;
4754 if (namelen
>= sizeof(mddev
->metadata_type
))
4755 namelen
= sizeof(mddev
->metadata_type
)-1;
4756 strncpy(mddev
->metadata_type
, buf
+9, namelen
);
4757 mddev
->metadata_type
[namelen
] = 0;
4758 if (namelen
&& mddev
->metadata_type
[namelen
-1] == '\n')
4759 mddev
->metadata_type
[--namelen
] = 0;
4760 mddev
->persistent
= 0;
4761 mddev
->external
= 1;
4762 mddev
->major_version
= 0;
4763 mddev
->minor_version
= 90;
4766 major
= simple_strtoul(buf
, &e
, 10);
4768 if (e
==buf
|| *e
!= '.')
4771 minor
= simple_strtoul(buf
, &e
, 10);
4772 if (e
==buf
|| (*e
&& *e
!= '\n') )
4775 if (major
>= ARRAY_SIZE(super_types
) || super_types
[major
].name
== NULL
)
4777 mddev
->major_version
= major
;
4778 mddev
->minor_version
= minor
;
4779 mddev
->persistent
= 1;
4780 mddev
->external
= 0;
4783 mddev_unlock(mddev
);
4787 static struct md_sysfs_entry md_metadata
=
4788 __ATTR_PREALLOC(metadata_version
, S_IRUGO
|S_IWUSR
, metadata_show
, metadata_store
);
4791 action_show(struct mddev
*mddev
, char *page
)
4793 char *type
= "idle";
4794 unsigned long recovery
= mddev
->recovery
;
4795 if (test_bit(MD_RECOVERY_FROZEN
, &recovery
))
4797 else if (test_bit(MD_RECOVERY_RUNNING
, &recovery
) ||
4798 (!mddev
->ro
&& test_bit(MD_RECOVERY_NEEDED
, &recovery
))) {
4799 if (test_bit(MD_RECOVERY_RESHAPE
, &recovery
))
4801 else if (test_bit(MD_RECOVERY_SYNC
, &recovery
)) {
4802 if (!test_bit(MD_RECOVERY_REQUESTED
, &recovery
))
4804 else if (test_bit(MD_RECOVERY_CHECK
, &recovery
))
4808 } else if (test_bit(MD_RECOVERY_RECOVER
, &recovery
))
4810 else if (mddev
->reshape_position
!= MaxSector
)
4813 return sprintf(page
, "%s\n", type
);
4817 action_store(struct mddev
*mddev
, const char *page
, size_t len
)
4819 if (!mddev
->pers
|| !mddev
->pers
->sync_request
)
4823 if (cmd_match(page
, "idle") || cmd_match(page
, "frozen")) {
4824 if (cmd_match(page
, "frozen"))
4825 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4827 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4828 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
4829 mddev_lock(mddev
) == 0) {
4830 if (work_pending(&mddev
->del_work
))
4831 flush_workqueue(md_misc_wq
);
4832 if (mddev
->sync_thread
) {
4833 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4834 md_reap_sync_thread(mddev
);
4836 mddev_unlock(mddev
);
4838 } else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4840 else if (cmd_match(page
, "resync"))
4841 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4842 else if (cmd_match(page
, "recover")) {
4843 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4844 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
4845 } else if (cmd_match(page
, "reshape")) {
4847 if (mddev
->pers
->start_reshape
== NULL
)
4849 err
= mddev_lock(mddev
);
4851 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4854 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4855 err
= mddev
->pers
->start_reshape(mddev
);
4857 mddev_unlock(mddev
);
4861 sysfs_notify_dirent_safe(mddev
->sysfs_degraded
);
4863 if (cmd_match(page
, "check"))
4864 set_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
4865 else if (!cmd_match(page
, "repair"))
4867 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4868 set_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
4869 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
4871 if (mddev
->ro
== 2) {
4872 /* A write to sync_action is enough to justify
4873 * canceling read-auto mode
4876 md_wakeup_thread(mddev
->sync_thread
);
4878 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4879 md_wakeup_thread(mddev
->thread
);
4880 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
4884 static struct md_sysfs_entry md_scan_mode
=
4885 __ATTR_PREALLOC(sync_action
, S_IRUGO
|S_IWUSR
, action_show
, action_store
);
4888 last_sync_action_show(struct mddev
*mddev
, char *page
)
4890 return sprintf(page
, "%s\n", mddev
->last_sync_action
);
4893 static struct md_sysfs_entry md_last_scan_mode
= __ATTR_RO(last_sync_action
);
4896 mismatch_cnt_show(struct mddev
*mddev
, char *page
)
4898 return sprintf(page
, "%llu\n",
4899 (unsigned long long)
4900 atomic64_read(&mddev
->resync_mismatches
));
4903 static struct md_sysfs_entry md_mismatches
= __ATTR_RO(mismatch_cnt
);
4906 sync_min_show(struct mddev
*mddev
, char *page
)
4908 return sprintf(page
, "%d (%s)\n", speed_min(mddev
),
4909 mddev
->sync_speed_min
? "local": "system");
4913 sync_min_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4918 if (strncmp(buf
, "system", 6)==0) {
4921 rv
= kstrtouint(buf
, 10, &min
);
4927 mddev
->sync_speed_min
= min
;
4931 static struct md_sysfs_entry md_sync_min
=
4932 __ATTR(sync_speed_min
, S_IRUGO
|S_IWUSR
, sync_min_show
, sync_min_store
);
4935 sync_max_show(struct mddev
*mddev
, char *page
)
4937 return sprintf(page
, "%d (%s)\n", speed_max(mddev
),
4938 mddev
->sync_speed_max
? "local": "system");
4942 sync_max_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4947 if (strncmp(buf
, "system", 6)==0) {
4950 rv
= kstrtouint(buf
, 10, &max
);
4956 mddev
->sync_speed_max
= max
;
4960 static struct md_sysfs_entry md_sync_max
=
4961 __ATTR(sync_speed_max
, S_IRUGO
|S_IWUSR
, sync_max_show
, sync_max_store
);
4964 degraded_show(struct mddev
*mddev
, char *page
)
4966 return sprintf(page
, "%d\n", mddev
->degraded
);
4968 static struct md_sysfs_entry md_degraded
= __ATTR_RO(degraded
);
4971 sync_force_parallel_show(struct mddev
*mddev
, char *page
)
4973 return sprintf(page
, "%d\n", mddev
->parallel_resync
);
4977 sync_force_parallel_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4981 if (kstrtol(buf
, 10, &n
))
4984 if (n
!= 0 && n
!= 1)
4987 mddev
->parallel_resync
= n
;
4989 if (mddev
->sync_thread
)
4990 wake_up(&resync_wait
);
4995 /* force parallel resync, even with shared block devices */
4996 static struct md_sysfs_entry md_sync_force_parallel
=
4997 __ATTR(sync_force_parallel
, S_IRUGO
|S_IWUSR
,
4998 sync_force_parallel_show
, sync_force_parallel_store
);
5001 sync_speed_show(struct mddev
*mddev
, char *page
)
5003 unsigned long resync
, dt
, db
;
5004 if (mddev
->curr_resync
== 0)
5005 return sprintf(page
, "none\n");
5006 resync
= mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
);
5007 dt
= (jiffies
- mddev
->resync_mark
) / HZ
;
5009 db
= resync
- mddev
->resync_mark_cnt
;
5010 return sprintf(page
, "%lu\n", db
/dt
/2); /* K/sec */
5013 static struct md_sysfs_entry md_sync_speed
= __ATTR_RO(sync_speed
);
5016 sync_completed_show(struct mddev
*mddev
, char *page
)
5018 unsigned long long max_sectors
, resync
;
5020 if (!test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
5021 return sprintf(page
, "none\n");
5023 if (mddev
->curr_resync
== 1 ||
5024 mddev
->curr_resync
== 2)
5025 return sprintf(page
, "delayed\n");
5027 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
5028 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
5029 max_sectors
= mddev
->resync_max_sectors
;
5031 max_sectors
= mddev
->dev_sectors
;
5033 resync
= mddev
->curr_resync_completed
;
5034 return sprintf(page
, "%llu / %llu\n", resync
, max_sectors
);
5037 static struct md_sysfs_entry md_sync_completed
=
5038 __ATTR_PREALLOC(sync_completed
, S_IRUGO
, sync_completed_show
, NULL
);
5041 min_sync_show(struct mddev
*mddev
, char *page
)
5043 return sprintf(page
, "%llu\n",
5044 (unsigned long long)mddev
->resync_min
);
5047 min_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
5049 unsigned long long min
;
5052 if (kstrtoull(buf
, 10, &min
))
5055 spin_lock(&mddev
->lock
);
5057 if (min
> mddev
->resync_max
)
5061 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
5064 /* Round down to multiple of 4K for safety */
5065 mddev
->resync_min
= round_down(min
, 8);
5069 spin_unlock(&mddev
->lock
);
5073 static struct md_sysfs_entry md_min_sync
=
5074 __ATTR(sync_min
, S_IRUGO
|S_IWUSR
, min_sync_show
, min_sync_store
);
5077 max_sync_show(struct mddev
*mddev
, char *page
)
5079 if (mddev
->resync_max
== MaxSector
)
5080 return sprintf(page
, "max\n");
5082 return sprintf(page
, "%llu\n",
5083 (unsigned long long)mddev
->resync_max
);
5086 max_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
5089 spin_lock(&mddev
->lock
);
5090 if (strncmp(buf
, "max", 3) == 0)
5091 mddev
->resync_max
= MaxSector
;
5093 unsigned long long max
;
5097 if (kstrtoull(buf
, 10, &max
))
5099 if (max
< mddev
->resync_min
)
5103 if (max
< mddev
->resync_max
&&
5105 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
5108 /* Must be a multiple of chunk_size */
5109 chunk
= mddev
->chunk_sectors
;
5111 sector_t temp
= max
;
5114 if (sector_div(temp
, chunk
))
5117 mddev
->resync_max
= max
;
5119 wake_up(&mddev
->recovery_wait
);
5122 spin_unlock(&mddev
->lock
);
5126 static struct md_sysfs_entry md_max_sync
=
5127 __ATTR(sync_max
, S_IRUGO
|S_IWUSR
, max_sync_show
, max_sync_store
);
5130 suspend_lo_show(struct mddev
*mddev
, char *page
)
5132 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_lo
);
5136 suspend_lo_store(struct mddev
*mddev
, const char *buf
, size_t len
)
5138 unsigned long long new;
5141 err
= kstrtoull(buf
, 10, &new);
5144 if (new != (sector_t
)new)
5147 err
= mddev_lock(mddev
);
5151 if (mddev
->pers
== NULL
||
5152 mddev
->pers
->quiesce
== NULL
)
5154 mddev_suspend(mddev
);
5155 mddev
->suspend_lo
= new;
5156 mddev_resume(mddev
);
5160 mddev_unlock(mddev
);
5163 static struct md_sysfs_entry md_suspend_lo
=
5164 __ATTR(suspend_lo
, S_IRUGO
|S_IWUSR
, suspend_lo_show
, suspend_lo_store
);
5167 suspend_hi_show(struct mddev
*mddev
, char *page
)
5169 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_hi
);
5173 suspend_hi_store(struct mddev
*mddev
, const char *buf
, size_t len
)
5175 unsigned long long new;
5178 err
= kstrtoull(buf
, 10, &new);
5181 if (new != (sector_t
)new)
5184 err
= mddev_lock(mddev
);
5188 if (mddev
->pers
== NULL
)
5191 mddev_suspend(mddev
);
5192 mddev
->suspend_hi
= new;
5193 mddev_resume(mddev
);
5197 mddev_unlock(mddev
);
5200 static struct md_sysfs_entry md_suspend_hi
=
5201 __ATTR(suspend_hi
, S_IRUGO
|S_IWUSR
, suspend_hi_show
, suspend_hi_store
);
5204 reshape_position_show(struct mddev
*mddev
, char *page
)
5206 if (mddev
->reshape_position
!= MaxSector
)
5207 return sprintf(page
, "%llu\n",
5208 (unsigned long long)mddev
->reshape_position
);
5209 strcpy(page
, "none\n");
5214 reshape_position_store(struct mddev
*mddev
, const char *buf
, size_t len
)
5216 struct md_rdev
*rdev
;
5217 unsigned long long new;
5220 err
= kstrtoull(buf
, 10, &new);
5223 if (new != (sector_t
)new)
5225 err
= mddev_lock(mddev
);
5231 mddev
->reshape_position
= new;
5232 mddev
->delta_disks
= 0;
5233 mddev
->reshape_backwards
= 0;
5234 mddev
->new_level
= mddev
->level
;
5235 mddev
->new_layout
= mddev
->layout
;
5236 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
5237 rdev_for_each(rdev
, mddev
)
5238 rdev
->new_data_offset
= rdev
->data_offset
;
5241 mddev_unlock(mddev
);
5245 static struct md_sysfs_entry md_reshape_position
=
5246 __ATTR(reshape_position
, S_IRUGO
|S_IWUSR
, reshape_position_show
,
5247 reshape_position_store
);
5250 reshape_direction_show(struct mddev
*mddev
, char *page
)
5252 return sprintf(page
, "%s\n",
5253 mddev
->reshape_backwards
? "backwards" : "forwards");
5257 reshape_direction_store(struct mddev
*mddev
, const char *buf
, size_t len
)
5262 if (cmd_match(buf
, "forwards"))
5264 else if (cmd_match(buf
, "backwards"))
5268 if (mddev
->reshape_backwards
== backwards
)
5271 err
= mddev_lock(mddev
);
5274 /* check if we are allowed to change */
5275 if (mddev
->delta_disks
)
5277 else if (mddev
->persistent
&&
5278 mddev
->major_version
== 0)
5281 mddev
->reshape_backwards
= backwards
;
5282 mddev_unlock(mddev
);
5286 static struct md_sysfs_entry md_reshape_direction
=
5287 __ATTR(reshape_direction
, S_IRUGO
|S_IWUSR
, reshape_direction_show
,
5288 reshape_direction_store
);
5291 array_size_show(struct mddev
*mddev
, char *page
)
5293 if (mddev
->external_size
)
5294 return sprintf(page
, "%llu\n",
5295 (unsigned long long)mddev
->array_sectors
/2);
5297 return sprintf(page
, "default\n");
5301 array_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
5306 err
= mddev_lock(mddev
);
5310 /* cluster raid doesn't support change array_sectors */
5311 if (mddev_is_clustered(mddev
)) {
5312 mddev_unlock(mddev
);
5316 if (strncmp(buf
, "default", 7) == 0) {
5318 sectors
= mddev
->pers
->size(mddev
, 0, 0);
5320 sectors
= mddev
->array_sectors
;
5322 mddev
->external_size
= 0;
5324 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
5326 else if (mddev
->pers
&& mddev
->pers
->size(mddev
, 0, 0) < sectors
)
5329 mddev
->external_size
= 1;
5333 mddev
->array_sectors
= sectors
;
5335 set_capacity_and_notify(mddev
->gendisk
,
5336 mddev
->array_sectors
);
5338 mddev_unlock(mddev
);
5342 static struct md_sysfs_entry md_array_size
=
5343 __ATTR(array_size
, S_IRUGO
|S_IWUSR
, array_size_show
,
5347 consistency_policy_show(struct mddev
*mddev
, char *page
)
5351 if (test_bit(MD_HAS_JOURNAL
, &mddev
->flags
)) {
5352 ret
= sprintf(page
, "journal\n");
5353 } else if (test_bit(MD_HAS_PPL
, &mddev
->flags
)) {
5354 ret
= sprintf(page
, "ppl\n");
5355 } else if (mddev
->bitmap
) {
5356 ret
= sprintf(page
, "bitmap\n");
5357 } else if (mddev
->pers
) {
5358 if (mddev
->pers
->sync_request
)
5359 ret
= sprintf(page
, "resync\n");
5361 ret
= sprintf(page
, "none\n");
5363 ret
= sprintf(page
, "unknown\n");
5370 consistency_policy_store(struct mddev
*mddev
, const char *buf
, size_t len
)
5375 if (mddev
->pers
->change_consistency_policy
)
5376 err
= mddev
->pers
->change_consistency_policy(mddev
, buf
);
5379 } else if (mddev
->external
&& strncmp(buf
, "ppl", 3) == 0) {
5380 set_bit(MD_HAS_PPL
, &mddev
->flags
);
5385 return err
? err
: len
;
5388 static struct md_sysfs_entry md_consistency_policy
=
5389 __ATTR(consistency_policy
, S_IRUGO
| S_IWUSR
, consistency_policy_show
,
5390 consistency_policy_store
);
5392 static ssize_t
fail_last_dev_show(struct mddev
*mddev
, char *page
)
5394 return sprintf(page
, "%d\n", mddev
->fail_last_dev
);
5398 * Setting fail_last_dev to true to allow last device to be forcibly removed
5399 * from RAID1/RAID10.
5402 fail_last_dev_store(struct mddev
*mddev
, const char *buf
, size_t len
)
5407 ret
= kstrtobool(buf
, &value
);
5411 if (value
!= mddev
->fail_last_dev
)
5412 mddev
->fail_last_dev
= value
;
5416 static struct md_sysfs_entry md_fail_last_dev
=
5417 __ATTR(fail_last_dev
, S_IRUGO
| S_IWUSR
, fail_last_dev_show
,
5418 fail_last_dev_store
);
5420 static ssize_t
serialize_policy_show(struct mddev
*mddev
, char *page
)
5422 if (mddev
->pers
== NULL
|| (mddev
->pers
->level
!= 1))
5423 return sprintf(page
, "n/a\n");
5425 return sprintf(page
, "%d\n", mddev
->serialize_policy
);
5429 * Setting serialize_policy to true to enforce write IO is not reordered
5433 serialize_policy_store(struct mddev
*mddev
, const char *buf
, size_t len
)
5438 err
= kstrtobool(buf
, &value
);
5442 if (value
== mddev
->serialize_policy
)
5445 err
= mddev_lock(mddev
);
5448 if (mddev
->pers
== NULL
|| (mddev
->pers
->level
!= 1)) {
5449 pr_err("md: serialize_policy is only effective for raid1\n");
5454 mddev_suspend(mddev
);
5456 mddev_create_serial_pool(mddev
, NULL
, true);
5458 mddev_destroy_serial_pool(mddev
, NULL
, true);
5459 mddev
->serialize_policy
= value
;
5460 mddev_resume(mddev
);
5462 mddev_unlock(mddev
);
5466 static struct md_sysfs_entry md_serialize_policy
=
5467 __ATTR(serialize_policy
, S_IRUGO
| S_IWUSR
, serialize_policy_show
,
5468 serialize_policy_store
);
5471 static struct attribute
*md_default_attrs
[] = {
5474 &md_raid_disks
.attr
,
5476 &md_chunk_size
.attr
,
5478 &md_resync_start
.attr
,
5480 &md_new_device
.attr
,
5481 &md_safe_delay
.attr
,
5482 &md_array_state
.attr
,
5483 &md_reshape_position
.attr
,
5484 &md_reshape_direction
.attr
,
5485 &md_array_size
.attr
,
5486 &max_corr_read_errors
.attr
,
5487 &md_consistency_policy
.attr
,
5488 &md_fail_last_dev
.attr
,
5489 &md_serialize_policy
.attr
,
5493 static struct attribute
*md_redundancy_attrs
[] = {
5495 &md_last_scan_mode
.attr
,
5496 &md_mismatches
.attr
,
5499 &md_sync_speed
.attr
,
5500 &md_sync_force_parallel
.attr
,
5501 &md_sync_completed
.attr
,
5504 &md_suspend_lo
.attr
,
5505 &md_suspend_hi
.attr
,
5510 static const struct attribute_group md_redundancy_group
= {
5512 .attrs
= md_redundancy_attrs
,
5516 md_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
5518 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
5519 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
5524 spin_lock(&all_mddevs_lock
);
5525 if (list_empty(&mddev
->all_mddevs
)) {
5526 spin_unlock(&all_mddevs_lock
);
5530 spin_unlock(&all_mddevs_lock
);
5532 rv
= entry
->show(mddev
, page
);
5538 md_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
5539 const char *page
, size_t length
)
5541 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
5542 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
5547 if (!capable(CAP_SYS_ADMIN
))
5549 spin_lock(&all_mddevs_lock
);
5550 if (list_empty(&mddev
->all_mddevs
)) {
5551 spin_unlock(&all_mddevs_lock
);
5555 spin_unlock(&all_mddevs_lock
);
5556 rv
= entry
->store(mddev
, page
, length
);
5561 static void md_free(struct kobject
*ko
)
5563 struct mddev
*mddev
= container_of(ko
, struct mddev
, kobj
);
5565 if (mddev
->sysfs_state
)
5566 sysfs_put(mddev
->sysfs_state
);
5567 if (mddev
->sysfs_level
)
5568 sysfs_put(mddev
->sysfs_level
);
5570 if (mddev
->gendisk
) {
5571 del_gendisk(mddev
->gendisk
);
5572 blk_cleanup_disk(mddev
->gendisk
);
5574 percpu_ref_exit(&mddev
->writes_pending
);
5576 bioset_exit(&mddev
->bio_set
);
5577 bioset_exit(&mddev
->sync_set
);
5578 if (mddev
->level
!= 1 && mddev
->level
!= 10)
5579 bioset_exit(&mddev
->io_acct_set
);
5583 static const struct sysfs_ops md_sysfs_ops
= {
5584 .show
= md_attr_show
,
5585 .store
= md_attr_store
,
5587 static struct kobj_type md_ktype
= {
5589 .sysfs_ops
= &md_sysfs_ops
,
5590 .default_attrs
= md_default_attrs
,
5595 static void mddev_delayed_delete(struct work_struct
*ws
)
5597 struct mddev
*mddev
= container_of(ws
, struct mddev
, del_work
);
5599 sysfs_remove_group(&mddev
->kobj
, &md_bitmap_group
);
5600 kobject_del(&mddev
->kobj
);
5601 kobject_put(&mddev
->kobj
);
5604 static void no_op(struct percpu_ref
*r
) {}
5606 int mddev_init_writes_pending(struct mddev
*mddev
)
5608 if (mddev
->writes_pending
.percpu_count_ptr
)
5610 if (percpu_ref_init(&mddev
->writes_pending
, no_op
,
5611 PERCPU_REF_ALLOW_REINIT
, GFP_KERNEL
) < 0)
5613 /* We want to start with the refcount at zero */
5614 percpu_ref_put(&mddev
->writes_pending
);
5617 EXPORT_SYMBOL_GPL(mddev_init_writes_pending
);
5619 static int md_alloc(dev_t dev
, char *name
)
5622 * If dev is zero, name is the name of a device to allocate with
5623 * an arbitrary minor number. It will be "md_???"
5624 * If dev is non-zero it must be a device number with a MAJOR of
5625 * MD_MAJOR or mdp_major. In this case, if "name" is NULL, then
5626 * the device is being created by opening a node in /dev.
5627 * If "name" is not NULL, the device is being created by
5628 * writing to /sys/module/md_mod/parameters/new_array.
5630 static DEFINE_MUTEX(disks_mutex
);
5631 struct mddev
*mddev
;
5632 struct gendisk
*disk
;
5639 * Wait for any previous instance of this device to be completely
5640 * removed (mddev_delayed_delete).
5642 flush_workqueue(md_misc_wq
);
5644 mutex_lock(&disks_mutex
);
5645 mddev
= mddev_alloc(dev
);
5646 if (IS_ERR(mddev
)) {
5647 mutex_unlock(&disks_mutex
);
5648 return PTR_ERR(mddev
);
5651 partitioned
= (MAJOR(mddev
->unit
) != MD_MAJOR
);
5652 shift
= partitioned
? MdpMinorShift
: 0;
5653 unit
= MINOR(mddev
->unit
) >> shift
;
5656 /* Need to ensure that 'name' is not a duplicate.
5658 struct mddev
*mddev2
;
5659 spin_lock(&all_mddevs_lock
);
5661 list_for_each_entry(mddev2
, &all_mddevs
, all_mddevs
)
5662 if (mddev2
->gendisk
&&
5663 strcmp(mddev2
->gendisk
->disk_name
, name
) == 0) {
5664 spin_unlock(&all_mddevs_lock
);
5668 spin_unlock(&all_mddevs_lock
);
5672 * Creating /dev/mdNNN via "newarray", so adjust hold_active.
5674 mddev
->hold_active
= UNTIL_STOP
;
5677 disk
= blk_alloc_disk(NUMA_NO_NODE
);
5681 disk
->major
= MAJOR(mddev
->unit
);
5682 disk
->first_minor
= unit
<< shift
;
5683 disk
->minors
= 1 << shift
;
5685 strcpy(disk
->disk_name
, name
);
5686 else if (partitioned
)
5687 sprintf(disk
->disk_name
, "md_d%d", unit
);
5689 sprintf(disk
->disk_name
, "md%d", unit
);
5690 disk
->fops
= &md_fops
;
5691 disk
->private_data
= mddev
;
5693 mddev
->queue
= disk
->queue
;
5694 blk_set_stacking_limits(&mddev
->queue
->limits
);
5695 blk_queue_write_cache(mddev
->queue
, true, true);
5696 /* Allow extended partitions. This makes the
5697 * 'mdp' device redundant, but we can't really
5700 disk
->flags
|= GENHD_FL_EXT_DEVT
;
5701 disk
->events
|= DISK_EVENT_MEDIA_CHANGE
;
5702 mddev
->gendisk
= disk
;
5705 error
= kobject_add(&mddev
->kobj
, &disk_to_dev(disk
)->kobj
, "%s", "md");
5707 /* This isn't possible, but as kobject_init_and_add is marked
5708 * __must_check, we must do something with the result
5710 pr_debug("md: cannot register %s/md - name in use\n",
5714 if (mddev
->kobj
.sd
&&
5715 sysfs_create_group(&mddev
->kobj
, &md_bitmap_group
))
5716 pr_debug("pointless warning\n");
5718 mutex_unlock(&disks_mutex
);
5719 if (!error
&& mddev
->kobj
.sd
) {
5720 kobject_uevent(&mddev
->kobj
, KOBJ_ADD
);
5721 mddev
->sysfs_state
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "array_state");
5722 mddev
->sysfs_level
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "level");
5728 static void md_probe(dev_t dev
)
5730 if (MAJOR(dev
) == MD_MAJOR
&& MINOR(dev
) >= 512)
5733 md_alloc(dev
, NULL
);
5736 static int add_named_array(const char *val
, const struct kernel_param
*kp
)
5739 * val must be "md_*" or "mdNNN".
5740 * For "md_*" we allocate an array with a large free minor number, and
5741 * set the name to val. val must not already be an active name.
5742 * For "mdNNN" we allocate an array with the minor number NNN
5743 * which must not already be in use.
5745 int len
= strlen(val
);
5746 char buf
[DISK_NAME_LEN
];
5747 unsigned long devnum
;
5749 while (len
&& val
[len
-1] == '\n')
5751 if (len
>= DISK_NAME_LEN
)
5753 strlcpy(buf
, val
, len
+1);
5754 if (strncmp(buf
, "md_", 3) == 0)
5755 return md_alloc(0, buf
);
5756 if (strncmp(buf
, "md", 2) == 0 &&
5758 kstrtoul(buf
+2, 10, &devnum
) == 0 &&
5759 devnum
<= MINORMASK
)
5760 return md_alloc(MKDEV(MD_MAJOR
, devnum
), NULL
);
5765 static void md_safemode_timeout(struct timer_list
*t
)
5767 struct mddev
*mddev
= from_timer(mddev
, t
, safemode_timer
);
5769 mddev
->safemode
= 1;
5770 if (mddev
->external
)
5771 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5773 md_wakeup_thread(mddev
->thread
);
5776 static int start_dirty_degraded
;
5778 int md_run(struct mddev
*mddev
)
5781 struct md_rdev
*rdev
;
5782 struct md_personality
*pers
;
5784 if (list_empty(&mddev
->disks
))
5785 /* cannot run an array with no devices.. */
5790 /* Cannot run until previous stop completes properly */
5791 if (mddev
->sysfs_active
)
5795 * Analyze all RAID superblock(s)
5797 if (!mddev
->raid_disks
) {
5798 if (!mddev
->persistent
)
5800 err
= analyze_sbs(mddev
);
5805 if (mddev
->level
!= LEVEL_NONE
)
5806 request_module("md-level-%d", mddev
->level
);
5807 else if (mddev
->clevel
[0])
5808 request_module("md-%s", mddev
->clevel
);
5811 * Drop all container device buffers, from now on
5812 * the only valid external interface is through the md
5815 mddev
->has_superblocks
= false;
5816 rdev_for_each(rdev
, mddev
) {
5817 if (test_bit(Faulty
, &rdev
->flags
))
5819 sync_blockdev(rdev
->bdev
);
5820 invalidate_bdev(rdev
->bdev
);
5821 if (mddev
->ro
!= 1 && rdev_read_only(rdev
)) {
5824 set_disk_ro(mddev
->gendisk
, 1);
5828 mddev
->has_superblocks
= true;
5830 /* perform some consistency tests on the device.
5831 * We don't want the data to overlap the metadata,
5832 * Internal Bitmap issues have been handled elsewhere.
5834 if (rdev
->meta_bdev
) {
5835 /* Nothing to check */;
5836 } else if (rdev
->data_offset
< rdev
->sb_start
) {
5837 if (mddev
->dev_sectors
&&
5838 rdev
->data_offset
+ mddev
->dev_sectors
5840 pr_warn("md: %s: data overlaps metadata\n",
5845 if (rdev
->sb_start
+ rdev
->sb_size
/512
5846 > rdev
->data_offset
) {
5847 pr_warn("md: %s: metadata overlaps data\n",
5852 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
5855 if (!bioset_initialized(&mddev
->bio_set
)) {
5856 err
= bioset_init(&mddev
->bio_set
, BIO_POOL_SIZE
, 0, BIOSET_NEED_BVECS
);
5860 if (!bioset_initialized(&mddev
->sync_set
)) {
5861 err
= bioset_init(&mddev
->sync_set
, BIO_POOL_SIZE
, 0, BIOSET_NEED_BVECS
);
5865 if (mddev
->level
!= 1 && mddev
->level
!= 10 &&
5866 !bioset_initialized(&mddev
->io_acct_set
)) {
5867 err
= bioset_init(&mddev
->io_acct_set
, BIO_POOL_SIZE
,
5868 offsetof(struct md_io_acct
, bio_clone
), 0);
5873 spin_lock(&pers_lock
);
5874 pers
= find_pers(mddev
->level
, mddev
->clevel
);
5875 if (!pers
|| !try_module_get(pers
->owner
)) {
5876 spin_unlock(&pers_lock
);
5877 if (mddev
->level
!= LEVEL_NONE
)
5878 pr_warn("md: personality for level %d is not loaded!\n",
5881 pr_warn("md: personality for level %s is not loaded!\n",
5886 spin_unlock(&pers_lock
);
5887 if (mddev
->level
!= pers
->level
) {
5888 mddev
->level
= pers
->level
;
5889 mddev
->new_level
= pers
->level
;
5891 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
5893 if (mddev
->reshape_position
!= MaxSector
&&
5894 pers
->start_reshape
== NULL
) {
5895 /* This personality cannot handle reshaping... */
5896 module_put(pers
->owner
);
5901 if (pers
->sync_request
) {
5902 /* Warn if this is a potentially silly
5905 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
5906 struct md_rdev
*rdev2
;
5909 rdev_for_each(rdev
, mddev
)
5910 rdev_for_each(rdev2
, mddev
) {
5912 rdev
->bdev
->bd_disk
==
5913 rdev2
->bdev
->bd_disk
) {
5914 pr_warn("%s: WARNING: %s appears to be on the same physical disk as %s.\n",
5916 bdevname(rdev
->bdev
,b
),
5917 bdevname(rdev2
->bdev
,b2
));
5923 pr_warn("True protection against single-disk failure might be compromised.\n");
5926 mddev
->recovery
= 0;
5927 /* may be over-ridden by personality */
5928 mddev
->resync_max_sectors
= mddev
->dev_sectors
;
5930 mddev
->ok_start_degraded
= start_dirty_degraded
;
5932 if (start_readonly
&& mddev
->ro
== 0)
5933 mddev
->ro
= 2; /* read-only, but switch on first write */
5935 err
= pers
->run(mddev
);
5937 pr_warn("md: pers->run() failed ...\n");
5938 else if (pers
->size(mddev
, 0, 0) < mddev
->array_sectors
) {
5939 WARN_ONCE(!mddev
->external_size
,
5940 "%s: default size too small, but 'external_size' not in effect?\n",
5942 pr_warn("md: invalid array_size %llu > default size %llu\n",
5943 (unsigned long long)mddev
->array_sectors
/ 2,
5944 (unsigned long long)pers
->size(mddev
, 0, 0) / 2);
5947 if (err
== 0 && pers
->sync_request
&&
5948 (mddev
->bitmap_info
.file
|| mddev
->bitmap_info
.offset
)) {
5949 struct bitmap
*bitmap
;
5951 bitmap
= md_bitmap_create(mddev
, -1);
5952 if (IS_ERR(bitmap
)) {
5953 err
= PTR_ERR(bitmap
);
5954 pr_warn("%s: failed to create bitmap (%d)\n",
5955 mdname(mddev
), err
);
5957 mddev
->bitmap
= bitmap
;
5963 if (mddev
->bitmap_info
.max_write_behind
> 0) {
5964 bool create_pool
= false;
5966 rdev_for_each(rdev
, mddev
) {
5967 if (test_bit(WriteMostly
, &rdev
->flags
) &&
5968 rdev_init_serial(rdev
))
5971 if (create_pool
&& mddev
->serial_info_pool
== NULL
) {
5972 mddev
->serial_info_pool
=
5973 mempool_create_kmalloc_pool(NR_SERIAL_INFOS
,
5974 sizeof(struct serial_info
));
5975 if (!mddev
->serial_info_pool
) {
5985 rdev_for_each(rdev
, mddev
) {
5986 if (rdev
->raid_disk
>= 0 &&
5987 !blk_queue_nonrot(bdev_get_queue(rdev
->bdev
))) {
5992 if (mddev
->degraded
)
5995 blk_queue_flag_set(QUEUE_FLAG_NONROT
, mddev
->queue
);
5997 blk_queue_flag_clear(QUEUE_FLAG_NONROT
, mddev
->queue
);
5998 blk_queue_flag_set(QUEUE_FLAG_IO_STAT
, mddev
->queue
);
6000 if (pers
->sync_request
) {
6001 if (mddev
->kobj
.sd
&&
6002 sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
6003 pr_warn("md: cannot register extra attributes for %s\n",
6005 mddev
->sysfs_action
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "sync_action");
6006 mddev
->sysfs_completed
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "sync_completed");
6007 mddev
->sysfs_degraded
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "degraded");
6008 } else if (mddev
->ro
== 2) /* auto-readonly not meaningful */
6011 atomic_set(&mddev
->max_corr_read_errors
,
6012 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS
);
6013 mddev
->safemode
= 0;
6014 if (mddev_is_clustered(mddev
))
6015 mddev
->safemode_delay
= 0;
6017 mddev
->safemode_delay
= DEFAULT_SAFEMODE_DELAY
;
6020 spin_lock(&mddev
->lock
);
6022 spin_unlock(&mddev
->lock
);
6023 rdev_for_each(rdev
, mddev
)
6024 if (rdev
->raid_disk
>= 0)
6025 sysfs_link_rdev(mddev
, rdev
); /* failure here is OK */
6027 if (mddev
->degraded
&& !mddev
->ro
)
6028 /* This ensures that recovering status is reported immediately
6029 * via sysfs - until a lack of spares is confirmed.
6031 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
6032 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6034 if (mddev
->sb_flags
)
6035 md_update_sb(mddev
, 0);
6037 md_new_event(mddev
);
6041 mddev_detach(mddev
);
6043 pers
->free(mddev
, mddev
->private);
6044 mddev
->private = NULL
;
6045 module_put(pers
->owner
);
6046 md_bitmap_destroy(mddev
);
6048 if (mddev
->level
!= 1 && mddev
->level
!= 10)
6049 bioset_exit(&mddev
->io_acct_set
);
6051 bioset_exit(&mddev
->sync_set
);
6053 bioset_exit(&mddev
->bio_set
);
6056 EXPORT_SYMBOL_GPL(md_run
);
6058 int do_md_run(struct mddev
*mddev
)
6062 set_bit(MD_NOT_READY
, &mddev
->flags
);
6063 err
= md_run(mddev
);
6066 err
= md_bitmap_load(mddev
);
6068 md_bitmap_destroy(mddev
);
6072 if (mddev_is_clustered(mddev
))
6073 md_allow_write(mddev
);
6075 /* run start up tasks that require md_thread */
6078 md_wakeup_thread(mddev
->thread
);
6079 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
6081 set_capacity_and_notify(mddev
->gendisk
, mddev
->array_sectors
);
6082 clear_bit(MD_NOT_READY
, &mddev
->flags
);
6084 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
6085 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6086 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
6087 sysfs_notify_dirent_safe(mddev
->sysfs_degraded
);
6089 clear_bit(MD_NOT_READY
, &mddev
->flags
);
6093 int md_start(struct mddev
*mddev
)
6097 if (mddev
->pers
->start
) {
6098 set_bit(MD_RECOVERY_WAIT
, &mddev
->recovery
);
6099 md_wakeup_thread(mddev
->thread
);
6100 ret
= mddev
->pers
->start(mddev
);
6101 clear_bit(MD_RECOVERY_WAIT
, &mddev
->recovery
);
6102 md_wakeup_thread(mddev
->sync_thread
);
6106 EXPORT_SYMBOL_GPL(md_start
);
6108 static int restart_array(struct mddev
*mddev
)
6110 struct gendisk
*disk
= mddev
->gendisk
;
6111 struct md_rdev
*rdev
;
6112 bool has_journal
= false;
6113 bool has_readonly
= false;
6115 /* Complain if it has no devices */
6116 if (list_empty(&mddev
->disks
))
6124 rdev_for_each_rcu(rdev
, mddev
) {
6125 if (test_bit(Journal
, &rdev
->flags
) &&
6126 !test_bit(Faulty
, &rdev
->flags
))
6128 if (rdev_read_only(rdev
))
6129 has_readonly
= true;
6132 if (test_bit(MD_HAS_JOURNAL
, &mddev
->flags
) && !has_journal
)
6133 /* Don't restart rw with journal missing/faulty */
6138 mddev
->safemode
= 0;
6140 set_disk_ro(disk
, 0);
6141 pr_debug("md: %s switched to read-write mode.\n", mdname(mddev
));
6142 /* Kick recovery or resync if necessary */
6143 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6144 md_wakeup_thread(mddev
->thread
);
6145 md_wakeup_thread(mddev
->sync_thread
);
6146 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6150 static void md_clean(struct mddev
*mddev
)
6152 mddev
->array_sectors
= 0;
6153 mddev
->external_size
= 0;
6154 mddev
->dev_sectors
= 0;
6155 mddev
->raid_disks
= 0;
6156 mddev
->recovery_cp
= 0;
6157 mddev
->resync_min
= 0;
6158 mddev
->resync_max
= MaxSector
;
6159 mddev
->reshape_position
= MaxSector
;
6160 mddev
->external
= 0;
6161 mddev
->persistent
= 0;
6162 mddev
->level
= LEVEL_NONE
;
6163 mddev
->clevel
[0] = 0;
6165 mddev
->sb_flags
= 0;
6167 mddev
->metadata_type
[0] = 0;
6168 mddev
->chunk_sectors
= 0;
6169 mddev
->ctime
= mddev
->utime
= 0;
6171 mddev
->max_disks
= 0;
6173 mddev
->can_decrease_events
= 0;
6174 mddev
->delta_disks
= 0;
6175 mddev
->reshape_backwards
= 0;
6176 mddev
->new_level
= LEVEL_NONE
;
6177 mddev
->new_layout
= 0;
6178 mddev
->new_chunk_sectors
= 0;
6179 mddev
->curr_resync
= 0;
6180 atomic64_set(&mddev
->resync_mismatches
, 0);
6181 mddev
->suspend_lo
= mddev
->suspend_hi
= 0;
6182 mddev
->sync_speed_min
= mddev
->sync_speed_max
= 0;
6183 mddev
->recovery
= 0;
6186 mddev
->degraded
= 0;
6187 mddev
->safemode
= 0;
6188 mddev
->private = NULL
;
6189 mddev
->cluster_info
= NULL
;
6190 mddev
->bitmap_info
.offset
= 0;
6191 mddev
->bitmap_info
.default_offset
= 0;
6192 mddev
->bitmap_info
.default_space
= 0;
6193 mddev
->bitmap_info
.chunksize
= 0;
6194 mddev
->bitmap_info
.daemon_sleep
= 0;
6195 mddev
->bitmap_info
.max_write_behind
= 0;
6196 mddev
->bitmap_info
.nodes
= 0;
6199 static void __md_stop_writes(struct mddev
*mddev
)
6201 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
6202 if (work_pending(&mddev
->del_work
))
6203 flush_workqueue(md_misc_wq
);
6204 if (mddev
->sync_thread
) {
6205 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6206 md_reap_sync_thread(mddev
);
6209 del_timer_sync(&mddev
->safemode_timer
);
6211 if (mddev
->pers
&& mddev
->pers
->quiesce
) {
6212 mddev
->pers
->quiesce(mddev
, 1);
6213 mddev
->pers
->quiesce(mddev
, 0);
6215 md_bitmap_flush(mddev
);
6217 if (mddev
->ro
== 0 &&
6218 ((!mddev
->in_sync
&& !mddev_is_clustered(mddev
)) ||
6220 /* mark array as shutdown cleanly */
6221 if (!mddev_is_clustered(mddev
))
6223 md_update_sb(mddev
, 1);
6225 /* disable policy to guarantee rdevs free resources for serialization */
6226 mddev
->serialize_policy
= 0;
6227 mddev_destroy_serial_pool(mddev
, NULL
, true);
6230 void md_stop_writes(struct mddev
*mddev
)
6232 mddev_lock_nointr(mddev
);
6233 __md_stop_writes(mddev
);
6234 mddev_unlock(mddev
);
6236 EXPORT_SYMBOL_GPL(md_stop_writes
);
6238 static void mddev_detach(struct mddev
*mddev
)
6240 md_bitmap_wait_behind_writes(mddev
);
6241 if (mddev
->pers
&& mddev
->pers
->quiesce
&& !mddev
->suspended
) {
6242 mddev
->pers
->quiesce(mddev
, 1);
6243 mddev
->pers
->quiesce(mddev
, 0);
6245 md_unregister_thread(&mddev
->thread
);
6247 blk_sync_queue(mddev
->queue
); /* the unplug fn references 'conf'*/
6250 static void __md_stop(struct mddev
*mddev
)
6252 struct md_personality
*pers
= mddev
->pers
;
6253 md_bitmap_destroy(mddev
);
6254 mddev_detach(mddev
);
6255 /* Ensure ->event_work is done */
6256 if (mddev
->event_work
.func
)
6257 flush_workqueue(md_misc_wq
);
6258 spin_lock(&mddev
->lock
);
6260 spin_unlock(&mddev
->lock
);
6261 pers
->free(mddev
, mddev
->private);
6262 mddev
->private = NULL
;
6263 if (pers
->sync_request
&& mddev
->to_remove
== NULL
)
6264 mddev
->to_remove
= &md_redundancy_group
;
6265 module_put(pers
->owner
);
6266 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
6269 void md_stop(struct mddev
*mddev
)
6271 /* stop the array and free an attached data structures.
6272 * This is called from dm-raid
6275 bioset_exit(&mddev
->bio_set
);
6276 bioset_exit(&mddev
->sync_set
);
6277 if (mddev
->level
!= 1 && mddev
->level
!= 10)
6278 bioset_exit(&mddev
->io_acct_set
);
6281 EXPORT_SYMBOL_GPL(md_stop
);
6283 static int md_set_readonly(struct mddev
*mddev
, struct block_device
*bdev
)
6288 if (!test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
)) {
6290 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
6291 md_wakeup_thread(mddev
->thread
);
6293 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
6294 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6295 if (mddev
->sync_thread
)
6296 /* Thread might be blocked waiting for metadata update
6297 * which will now never happen */
6298 wake_up_process(mddev
->sync_thread
->tsk
);
6300 if (mddev
->external
&& test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
))
6302 mddev_unlock(mddev
);
6303 wait_event(resync_wait
, !test_bit(MD_RECOVERY_RUNNING
,
6305 wait_event(mddev
->sb_wait
,
6306 !test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
));
6307 mddev_lock_nointr(mddev
);
6309 mutex_lock(&mddev
->open_mutex
);
6310 if ((mddev
->pers
&& atomic_read(&mddev
->openers
) > !!bdev
) ||
6311 mddev
->sync_thread
||
6312 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
)) {
6313 pr_warn("md: %s still in use.\n",mdname(mddev
));
6315 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
6316 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6317 md_wakeup_thread(mddev
->thread
);
6323 __md_stop_writes(mddev
);
6329 set_disk_ro(mddev
->gendisk
, 1);
6330 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
6331 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6332 md_wakeup_thread(mddev
->thread
);
6333 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6337 mutex_unlock(&mddev
->open_mutex
);
6342 * 0 - completely stop and dis-assemble array
6343 * 2 - stop but do not disassemble array
6345 static int do_md_stop(struct mddev
*mddev
, int mode
,
6346 struct block_device
*bdev
)
6348 struct gendisk
*disk
= mddev
->gendisk
;
6349 struct md_rdev
*rdev
;
6352 if (!test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
)) {
6354 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
6355 md_wakeup_thread(mddev
->thread
);
6357 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
6358 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6359 if (mddev
->sync_thread
)
6360 /* Thread might be blocked waiting for metadata update
6361 * which will now never happen */
6362 wake_up_process(mddev
->sync_thread
->tsk
);
6364 mddev_unlock(mddev
);
6365 wait_event(resync_wait
, (mddev
->sync_thread
== NULL
&&
6366 !test_bit(MD_RECOVERY_RUNNING
,
6367 &mddev
->recovery
)));
6368 mddev_lock_nointr(mddev
);
6370 mutex_lock(&mddev
->open_mutex
);
6371 if ((mddev
->pers
&& atomic_read(&mddev
->openers
) > !!bdev
) ||
6372 mddev
->sysfs_active
||
6373 mddev
->sync_thread
||
6374 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
)) {
6375 pr_warn("md: %s still in use.\n",mdname(mddev
));
6376 mutex_unlock(&mddev
->open_mutex
);
6378 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
6379 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6380 md_wakeup_thread(mddev
->thread
);
6386 set_disk_ro(disk
, 0);
6388 __md_stop_writes(mddev
);
6391 /* tell userspace to handle 'inactive' */
6392 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6394 rdev_for_each(rdev
, mddev
)
6395 if (rdev
->raid_disk
>= 0)
6396 sysfs_unlink_rdev(mddev
, rdev
);
6398 set_capacity_and_notify(disk
, 0);
6399 mutex_unlock(&mddev
->open_mutex
);
6405 mutex_unlock(&mddev
->open_mutex
);
6407 * Free resources if final stop
6410 pr_info("md: %s stopped.\n", mdname(mddev
));
6412 if (mddev
->bitmap_info
.file
) {
6413 struct file
*f
= mddev
->bitmap_info
.file
;
6414 spin_lock(&mddev
->lock
);
6415 mddev
->bitmap_info
.file
= NULL
;
6416 spin_unlock(&mddev
->lock
);
6419 mddev
->bitmap_info
.offset
= 0;
6421 export_array(mddev
);
6424 if (mddev
->hold_active
== UNTIL_STOP
)
6425 mddev
->hold_active
= 0;
6427 md_new_event(mddev
);
6428 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6433 static void autorun_array(struct mddev
*mddev
)
6435 struct md_rdev
*rdev
;
6438 if (list_empty(&mddev
->disks
))
6441 pr_info("md: running: ");
6443 rdev_for_each(rdev
, mddev
) {
6444 char b
[BDEVNAME_SIZE
];
6445 pr_cont("<%s>", bdevname(rdev
->bdev
,b
));
6449 err
= do_md_run(mddev
);
6451 pr_warn("md: do_md_run() returned %d\n", err
);
6452 do_md_stop(mddev
, 0, NULL
);
6457 * lets try to run arrays based on all disks that have arrived
6458 * until now. (those are in pending_raid_disks)
6460 * the method: pick the first pending disk, collect all disks with
6461 * the same UUID, remove all from the pending list and put them into
6462 * the 'same_array' list. Then order this list based on superblock
6463 * update time (freshest comes first), kick out 'old' disks and
6464 * compare superblocks. If everything's fine then run it.
6466 * If "unit" is allocated, then bump its reference count
6468 static void autorun_devices(int part
)
6470 struct md_rdev
*rdev0
, *rdev
, *tmp
;
6471 struct mddev
*mddev
;
6472 char b
[BDEVNAME_SIZE
];
6474 pr_info("md: autorun ...\n");
6475 while (!list_empty(&pending_raid_disks
)) {
6478 LIST_HEAD(candidates
);
6479 rdev0
= list_entry(pending_raid_disks
.next
,
6480 struct md_rdev
, same_set
);
6482 pr_debug("md: considering %s ...\n", bdevname(rdev0
->bdev
,b
));
6483 INIT_LIST_HEAD(&candidates
);
6484 rdev_for_each_list(rdev
, tmp
, &pending_raid_disks
)
6485 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
6486 pr_debug("md: adding %s ...\n",
6487 bdevname(rdev
->bdev
,b
));
6488 list_move(&rdev
->same_set
, &candidates
);
6491 * now we have a set of devices, with all of them having
6492 * mostly sane superblocks. It's time to allocate the
6496 dev
= MKDEV(mdp_major
,
6497 rdev0
->preferred_minor
<< MdpMinorShift
);
6498 unit
= MINOR(dev
) >> MdpMinorShift
;
6500 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
6503 if (rdev0
->preferred_minor
!= unit
) {
6504 pr_warn("md: unit number in %s is bad: %d\n",
6505 bdevname(rdev0
->bdev
, b
), rdev0
->preferred_minor
);
6510 mddev
= mddev_find(dev
);
6514 if (mddev_lock(mddev
))
6515 pr_warn("md: %s locked, cannot run\n", mdname(mddev
));
6516 else if (mddev
->raid_disks
|| mddev
->major_version
6517 || !list_empty(&mddev
->disks
)) {
6518 pr_warn("md: %s already running, cannot run %s\n",
6519 mdname(mddev
), bdevname(rdev0
->bdev
,b
));
6520 mddev_unlock(mddev
);
6522 pr_debug("md: created %s\n", mdname(mddev
));
6523 mddev
->persistent
= 1;
6524 rdev_for_each_list(rdev
, tmp
, &candidates
) {
6525 list_del_init(&rdev
->same_set
);
6526 if (bind_rdev_to_array(rdev
, mddev
))
6529 autorun_array(mddev
);
6530 mddev_unlock(mddev
);
6532 /* on success, candidates will be empty, on error
6535 rdev_for_each_list(rdev
, tmp
, &candidates
) {
6536 list_del_init(&rdev
->same_set
);
6541 pr_info("md: ... autorun DONE.\n");
6543 #endif /* !MODULE */
6545 static int get_version(void __user
*arg
)
6549 ver
.major
= MD_MAJOR_VERSION
;
6550 ver
.minor
= MD_MINOR_VERSION
;
6551 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
6553 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
6559 static int get_array_info(struct mddev
*mddev
, void __user
*arg
)
6561 mdu_array_info_t info
;
6562 int nr
,working
,insync
,failed
,spare
;
6563 struct md_rdev
*rdev
;
6565 nr
= working
= insync
= failed
= spare
= 0;
6567 rdev_for_each_rcu(rdev
, mddev
) {
6569 if (test_bit(Faulty
, &rdev
->flags
))
6573 if (test_bit(In_sync
, &rdev
->flags
))
6575 else if (test_bit(Journal
, &rdev
->flags
))
6576 /* TODO: add journal count to md_u.h */
6584 info
.major_version
= mddev
->major_version
;
6585 info
.minor_version
= mddev
->minor_version
;
6586 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
6587 info
.ctime
= clamp_t(time64_t
, mddev
->ctime
, 0, U32_MAX
);
6588 info
.level
= mddev
->level
;
6589 info
.size
= mddev
->dev_sectors
/ 2;
6590 if (info
.size
!= mddev
->dev_sectors
/ 2) /* overflow */
6593 info
.raid_disks
= mddev
->raid_disks
;
6594 info
.md_minor
= mddev
->md_minor
;
6595 info
.not_persistent
= !mddev
->persistent
;
6597 info
.utime
= clamp_t(time64_t
, mddev
->utime
, 0, U32_MAX
);
6600 info
.state
= (1<<MD_SB_CLEAN
);
6601 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
6602 info
.state
|= (1<<MD_SB_BITMAP_PRESENT
);
6603 if (mddev_is_clustered(mddev
))
6604 info
.state
|= (1<<MD_SB_CLUSTERED
);
6605 info
.active_disks
= insync
;
6606 info
.working_disks
= working
;
6607 info
.failed_disks
= failed
;
6608 info
.spare_disks
= spare
;
6610 info
.layout
= mddev
->layout
;
6611 info
.chunk_size
= mddev
->chunk_sectors
<< 9;
6613 if (copy_to_user(arg
, &info
, sizeof(info
)))
6619 static int get_bitmap_file(struct mddev
*mddev
, void __user
* arg
)
6621 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
6625 file
= kzalloc(sizeof(*file
), GFP_NOIO
);
6630 spin_lock(&mddev
->lock
);
6631 /* bitmap enabled */
6632 if (mddev
->bitmap_info
.file
) {
6633 ptr
= file_path(mddev
->bitmap_info
.file
, file
->pathname
,
6634 sizeof(file
->pathname
));
6638 memmove(file
->pathname
, ptr
,
6639 sizeof(file
->pathname
)-(ptr
-file
->pathname
));
6641 spin_unlock(&mddev
->lock
);
6644 copy_to_user(arg
, file
, sizeof(*file
)))
6651 static int get_disk_info(struct mddev
*mddev
, void __user
* arg
)
6653 mdu_disk_info_t info
;
6654 struct md_rdev
*rdev
;
6656 if (copy_from_user(&info
, arg
, sizeof(info
)))
6660 rdev
= md_find_rdev_nr_rcu(mddev
, info
.number
);
6662 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
6663 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
6664 info
.raid_disk
= rdev
->raid_disk
;
6666 if (test_bit(Faulty
, &rdev
->flags
))
6667 info
.state
|= (1<<MD_DISK_FAULTY
);
6668 else if (test_bit(In_sync
, &rdev
->flags
)) {
6669 info
.state
|= (1<<MD_DISK_ACTIVE
);
6670 info
.state
|= (1<<MD_DISK_SYNC
);
6672 if (test_bit(Journal
, &rdev
->flags
))
6673 info
.state
|= (1<<MD_DISK_JOURNAL
);
6674 if (test_bit(WriteMostly
, &rdev
->flags
))
6675 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
6676 if (test_bit(FailFast
, &rdev
->flags
))
6677 info
.state
|= (1<<MD_DISK_FAILFAST
);
6679 info
.major
= info
.minor
= 0;
6680 info
.raid_disk
= -1;
6681 info
.state
= (1<<MD_DISK_REMOVED
);
6685 if (copy_to_user(arg
, &info
, sizeof(info
)))
6691 int md_add_new_disk(struct mddev
*mddev
, struct mdu_disk_info_s
*info
)
6693 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
6694 struct md_rdev
*rdev
;
6695 dev_t dev
= MKDEV(info
->major
,info
->minor
);
6697 if (mddev_is_clustered(mddev
) &&
6698 !(info
->state
& ((1 << MD_DISK_CLUSTER_ADD
) | (1 << MD_DISK_CANDIDATE
)))) {
6699 pr_warn("%s: Cannot add to clustered mddev.\n",
6704 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
6707 if (!mddev
->raid_disks
) {
6709 /* expecting a device which has a superblock */
6710 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
6712 pr_warn("md: md_import_device returned %ld\n",
6714 return PTR_ERR(rdev
);
6716 if (!list_empty(&mddev
->disks
)) {
6717 struct md_rdev
*rdev0
6718 = list_entry(mddev
->disks
.next
,
6719 struct md_rdev
, same_set
);
6720 err
= super_types
[mddev
->major_version
]
6721 .load_super(rdev
, rdev0
, mddev
->minor_version
);
6723 pr_warn("md: %s has different UUID to %s\n",
6724 bdevname(rdev
->bdev
,b
),
6725 bdevname(rdev0
->bdev
,b2
));
6730 err
= bind_rdev_to_array(rdev
, mddev
);
6737 * md_add_new_disk can be used once the array is assembled
6738 * to add "hot spares". They must already have a superblock
6743 if (!mddev
->pers
->hot_add_disk
) {
6744 pr_warn("%s: personality does not support diskops!\n",
6748 if (mddev
->persistent
)
6749 rdev
= md_import_device(dev
, mddev
->major_version
,
6750 mddev
->minor_version
);
6752 rdev
= md_import_device(dev
, -1, -1);
6754 pr_warn("md: md_import_device returned %ld\n",
6756 return PTR_ERR(rdev
);
6758 /* set saved_raid_disk if appropriate */
6759 if (!mddev
->persistent
) {
6760 if (info
->state
& (1<<MD_DISK_SYNC
) &&
6761 info
->raid_disk
< mddev
->raid_disks
) {
6762 rdev
->raid_disk
= info
->raid_disk
;
6763 set_bit(In_sync
, &rdev
->flags
);
6764 clear_bit(Bitmap_sync
, &rdev
->flags
);
6766 rdev
->raid_disk
= -1;
6767 rdev
->saved_raid_disk
= rdev
->raid_disk
;
6769 super_types
[mddev
->major_version
].
6770 validate_super(mddev
, rdev
);
6771 if ((info
->state
& (1<<MD_DISK_SYNC
)) &&
6772 rdev
->raid_disk
!= info
->raid_disk
) {
6773 /* This was a hot-add request, but events doesn't
6774 * match, so reject it.
6780 clear_bit(In_sync
, &rdev
->flags
); /* just to be sure */
6781 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
6782 set_bit(WriteMostly
, &rdev
->flags
);
6784 clear_bit(WriteMostly
, &rdev
->flags
);
6785 if (info
->state
& (1<<MD_DISK_FAILFAST
))
6786 set_bit(FailFast
, &rdev
->flags
);
6788 clear_bit(FailFast
, &rdev
->flags
);
6790 if (info
->state
& (1<<MD_DISK_JOURNAL
)) {
6791 struct md_rdev
*rdev2
;
6792 bool has_journal
= false;
6794 /* make sure no existing journal disk */
6795 rdev_for_each(rdev2
, mddev
) {
6796 if (test_bit(Journal
, &rdev2
->flags
)) {
6801 if (has_journal
|| mddev
->bitmap
) {
6805 set_bit(Journal
, &rdev
->flags
);
6808 * check whether the device shows up in other nodes
6810 if (mddev_is_clustered(mddev
)) {
6811 if (info
->state
& (1 << MD_DISK_CANDIDATE
))
6812 set_bit(Candidate
, &rdev
->flags
);
6813 else if (info
->state
& (1 << MD_DISK_CLUSTER_ADD
)) {
6814 /* --add initiated by this node */
6815 err
= md_cluster_ops
->add_new_disk(mddev
, rdev
);
6823 rdev
->raid_disk
= -1;
6824 err
= bind_rdev_to_array(rdev
, mddev
);
6829 if (mddev_is_clustered(mddev
)) {
6830 if (info
->state
& (1 << MD_DISK_CANDIDATE
)) {
6832 err
= md_cluster_ops
->new_disk_ack(mddev
,
6835 md_kick_rdev_from_array(rdev
);
6839 md_cluster_ops
->add_new_disk_cancel(mddev
);
6841 err
= add_bound_rdev(rdev
);
6845 err
= add_bound_rdev(rdev
);
6850 /* otherwise, md_add_new_disk is only allowed
6851 * for major_version==0 superblocks
6853 if (mddev
->major_version
!= 0) {
6854 pr_warn("%s: ADD_NEW_DISK not supported\n", mdname(mddev
));
6858 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
6860 rdev
= md_import_device(dev
, -1, 0);
6862 pr_warn("md: error, md_import_device() returned %ld\n",
6864 return PTR_ERR(rdev
);
6866 rdev
->desc_nr
= info
->number
;
6867 if (info
->raid_disk
< mddev
->raid_disks
)
6868 rdev
->raid_disk
= info
->raid_disk
;
6870 rdev
->raid_disk
= -1;
6872 if (rdev
->raid_disk
< mddev
->raid_disks
)
6873 if (info
->state
& (1<<MD_DISK_SYNC
))
6874 set_bit(In_sync
, &rdev
->flags
);
6876 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
6877 set_bit(WriteMostly
, &rdev
->flags
);
6878 if (info
->state
& (1<<MD_DISK_FAILFAST
))
6879 set_bit(FailFast
, &rdev
->flags
);
6881 if (!mddev
->persistent
) {
6882 pr_debug("md: nonpersistent superblock ...\n");
6883 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
6885 rdev
->sb_start
= calc_dev_sboffset(rdev
);
6886 rdev
->sectors
= rdev
->sb_start
;
6888 err
= bind_rdev_to_array(rdev
, mddev
);
6898 static int hot_remove_disk(struct mddev
*mddev
, dev_t dev
)
6900 char b
[BDEVNAME_SIZE
];
6901 struct md_rdev
*rdev
;
6906 rdev
= find_rdev(mddev
, dev
);
6910 if (rdev
->raid_disk
< 0)
6913 clear_bit(Blocked
, &rdev
->flags
);
6914 remove_and_add_spares(mddev
, rdev
);
6916 if (rdev
->raid_disk
>= 0)
6920 if (mddev_is_clustered(mddev
)) {
6921 if (md_cluster_ops
->remove_disk(mddev
, rdev
))
6925 md_kick_rdev_from_array(rdev
);
6926 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
6928 md_wakeup_thread(mddev
->thread
);
6930 md_update_sb(mddev
, 1);
6931 md_new_event(mddev
);
6935 pr_debug("md: cannot remove active disk %s from %s ...\n",
6936 bdevname(rdev
->bdev
,b
), mdname(mddev
));
6940 static int hot_add_disk(struct mddev
*mddev
, dev_t dev
)
6942 char b
[BDEVNAME_SIZE
];
6944 struct md_rdev
*rdev
;
6949 if (mddev
->major_version
!= 0) {
6950 pr_warn("%s: HOT_ADD may only be used with version-0 superblocks.\n",
6954 if (!mddev
->pers
->hot_add_disk
) {
6955 pr_warn("%s: personality does not support diskops!\n",
6960 rdev
= md_import_device(dev
, -1, 0);
6962 pr_warn("md: error, md_import_device() returned %ld\n",
6967 if (mddev
->persistent
)
6968 rdev
->sb_start
= calc_dev_sboffset(rdev
);
6970 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
6972 rdev
->sectors
= rdev
->sb_start
;
6974 if (test_bit(Faulty
, &rdev
->flags
)) {
6975 pr_warn("md: can not hot-add faulty %s disk to %s!\n",
6976 bdevname(rdev
->bdev
,b
), mdname(mddev
));
6981 clear_bit(In_sync
, &rdev
->flags
);
6983 rdev
->saved_raid_disk
= -1;
6984 err
= bind_rdev_to_array(rdev
, mddev
);
6989 * The rest should better be atomic, we can have disk failures
6990 * noticed in interrupt contexts ...
6993 rdev
->raid_disk
= -1;
6995 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
6997 md_update_sb(mddev
, 1);
6999 * Kick recovery, maybe this spare has to be added to the
7000 * array immediately.
7002 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7003 md_wakeup_thread(mddev
->thread
);
7004 md_new_event(mddev
);
7012 static int set_bitmap_file(struct mddev
*mddev
, int fd
)
7017 if (!mddev
->pers
->quiesce
|| !mddev
->thread
)
7019 if (mddev
->recovery
|| mddev
->sync_thread
)
7021 /* we should be able to change the bitmap.. */
7025 struct inode
*inode
;
7028 if (mddev
->bitmap
|| mddev
->bitmap_info
.file
)
7029 return -EEXIST
; /* cannot add when bitmap is present */
7033 pr_warn("%s: error: failed to get bitmap file\n",
7038 inode
= f
->f_mapping
->host
;
7039 if (!S_ISREG(inode
->i_mode
)) {
7040 pr_warn("%s: error: bitmap file must be a regular file\n",
7043 } else if (!(f
->f_mode
& FMODE_WRITE
)) {
7044 pr_warn("%s: error: bitmap file must open for write\n",
7047 } else if (atomic_read(&inode
->i_writecount
) != 1) {
7048 pr_warn("%s: error: bitmap file is already in use\n",
7056 mddev
->bitmap_info
.file
= f
;
7057 mddev
->bitmap_info
.offset
= 0; /* file overrides offset */
7058 } else if (mddev
->bitmap
== NULL
)
7059 return -ENOENT
; /* cannot remove what isn't there */
7063 struct bitmap
*bitmap
;
7065 bitmap
= md_bitmap_create(mddev
, -1);
7066 mddev_suspend(mddev
);
7067 if (!IS_ERR(bitmap
)) {
7068 mddev
->bitmap
= bitmap
;
7069 err
= md_bitmap_load(mddev
);
7071 err
= PTR_ERR(bitmap
);
7073 md_bitmap_destroy(mddev
);
7076 mddev_resume(mddev
);
7077 } else if (fd
< 0) {
7078 mddev_suspend(mddev
);
7079 md_bitmap_destroy(mddev
);
7080 mddev_resume(mddev
);
7084 struct file
*f
= mddev
->bitmap_info
.file
;
7086 spin_lock(&mddev
->lock
);
7087 mddev
->bitmap_info
.file
= NULL
;
7088 spin_unlock(&mddev
->lock
);
7097 * md_set_array_info is used two different ways
7098 * The original usage is when creating a new array.
7099 * In this usage, raid_disks is > 0 and it together with
7100 * level, size, not_persistent,layout,chunksize determine the
7101 * shape of the array.
7102 * This will always create an array with a type-0.90.0 superblock.
7103 * The newer usage is when assembling an array.
7104 * In this case raid_disks will be 0, and the major_version field is
7105 * use to determine which style super-blocks are to be found on the devices.
7106 * The minor and patch _version numbers are also kept incase the
7107 * super_block handler wishes to interpret them.
7109 int md_set_array_info(struct mddev
*mddev
, struct mdu_array_info_s
*info
)
7111 if (info
->raid_disks
== 0) {
7112 /* just setting version number for superblock loading */
7113 if (info
->major_version
< 0 ||
7114 info
->major_version
>= ARRAY_SIZE(super_types
) ||
7115 super_types
[info
->major_version
].name
== NULL
) {
7116 /* maybe try to auto-load a module? */
7117 pr_warn("md: superblock version %d not known\n",
7118 info
->major_version
);
7121 mddev
->major_version
= info
->major_version
;
7122 mddev
->minor_version
= info
->minor_version
;
7123 mddev
->patch_version
= info
->patch_version
;
7124 mddev
->persistent
= !info
->not_persistent
;
7125 /* ensure mddev_put doesn't delete this now that there
7126 * is some minimal configuration.
7128 mddev
->ctime
= ktime_get_real_seconds();
7131 mddev
->major_version
= MD_MAJOR_VERSION
;
7132 mddev
->minor_version
= MD_MINOR_VERSION
;
7133 mddev
->patch_version
= MD_PATCHLEVEL_VERSION
;
7134 mddev
->ctime
= ktime_get_real_seconds();
7136 mddev
->level
= info
->level
;
7137 mddev
->clevel
[0] = 0;
7138 mddev
->dev_sectors
= 2 * (sector_t
)info
->size
;
7139 mddev
->raid_disks
= info
->raid_disks
;
7140 /* don't set md_minor, it is determined by which /dev/md* was
7143 if (info
->state
& (1<<MD_SB_CLEAN
))
7144 mddev
->recovery_cp
= MaxSector
;
7146 mddev
->recovery_cp
= 0;
7147 mddev
->persistent
= ! info
->not_persistent
;
7148 mddev
->external
= 0;
7150 mddev
->layout
= info
->layout
;
7151 if (mddev
->level
== 0)
7152 /* Cannot trust RAID0 layout info here */
7154 mddev
->chunk_sectors
= info
->chunk_size
>> 9;
7156 if (mddev
->persistent
) {
7157 mddev
->max_disks
= MD_SB_DISKS
;
7159 mddev
->sb_flags
= 0;
7161 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
7163 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
7164 mddev
->bitmap_info
.default_space
= 64*2 - (MD_SB_BYTES
>> 9);
7165 mddev
->bitmap_info
.offset
= 0;
7167 mddev
->reshape_position
= MaxSector
;
7170 * Generate a 128 bit UUID
7172 get_random_bytes(mddev
->uuid
, 16);
7174 mddev
->new_level
= mddev
->level
;
7175 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
7176 mddev
->new_layout
= mddev
->layout
;
7177 mddev
->delta_disks
= 0;
7178 mddev
->reshape_backwards
= 0;
7183 void md_set_array_sectors(struct mddev
*mddev
, sector_t array_sectors
)
7185 lockdep_assert_held(&mddev
->reconfig_mutex
);
7187 if (mddev
->external_size
)
7190 mddev
->array_sectors
= array_sectors
;
7192 EXPORT_SYMBOL(md_set_array_sectors
);
7194 static int update_size(struct mddev
*mddev
, sector_t num_sectors
)
7196 struct md_rdev
*rdev
;
7198 int fit
= (num_sectors
== 0);
7199 sector_t old_dev_sectors
= mddev
->dev_sectors
;
7201 if (mddev
->pers
->resize
== NULL
)
7203 /* The "num_sectors" is the number of sectors of each device that
7204 * is used. This can only make sense for arrays with redundancy.
7205 * linear and raid0 always use whatever space is available. We can only
7206 * consider changing this number if no resync or reconstruction is
7207 * happening, and if the new size is acceptable. It must fit before the
7208 * sb_start or, if that is <data_offset, it must fit before the size
7209 * of each device. If num_sectors is zero, we find the largest size
7212 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
7218 rdev_for_each(rdev
, mddev
) {
7219 sector_t avail
= rdev
->sectors
;
7221 if (fit
&& (num_sectors
== 0 || num_sectors
> avail
))
7222 num_sectors
= avail
;
7223 if (avail
< num_sectors
)
7226 rv
= mddev
->pers
->resize(mddev
, num_sectors
);
7228 if (mddev_is_clustered(mddev
))
7229 md_cluster_ops
->update_size(mddev
, old_dev_sectors
);
7230 else if (mddev
->queue
) {
7231 set_capacity_and_notify(mddev
->gendisk
,
7232 mddev
->array_sectors
);
7238 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
)
7241 struct md_rdev
*rdev
;
7242 /* change the number of raid disks */
7243 if (mddev
->pers
->check_reshape
== NULL
)
7247 if (raid_disks
<= 0 ||
7248 (mddev
->max_disks
&& raid_disks
>= mddev
->max_disks
))
7250 if (mddev
->sync_thread
||
7251 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
7252 test_bit(MD_RESYNCING_REMOTE
, &mddev
->recovery
) ||
7253 mddev
->reshape_position
!= MaxSector
)
7256 rdev_for_each(rdev
, mddev
) {
7257 if (mddev
->raid_disks
< raid_disks
&&
7258 rdev
->data_offset
< rdev
->new_data_offset
)
7260 if (mddev
->raid_disks
> raid_disks
&&
7261 rdev
->data_offset
> rdev
->new_data_offset
)
7265 mddev
->delta_disks
= raid_disks
- mddev
->raid_disks
;
7266 if (mddev
->delta_disks
< 0)
7267 mddev
->reshape_backwards
= 1;
7268 else if (mddev
->delta_disks
> 0)
7269 mddev
->reshape_backwards
= 0;
7271 rv
= mddev
->pers
->check_reshape(mddev
);
7273 mddev
->delta_disks
= 0;
7274 mddev
->reshape_backwards
= 0;
7280 * update_array_info is used to change the configuration of an
7282 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
7283 * fields in the info are checked against the array.
7284 * Any differences that cannot be handled will cause an error.
7285 * Normally, only one change can be managed at a time.
7287 static int update_array_info(struct mddev
*mddev
, mdu_array_info_t
*info
)
7293 /* calculate expected state,ignoring low bits */
7294 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
7295 state
|= (1 << MD_SB_BITMAP_PRESENT
);
7297 if (mddev
->major_version
!= info
->major_version
||
7298 mddev
->minor_version
!= info
->minor_version
||
7299 /* mddev->patch_version != info->patch_version || */
7300 mddev
->ctime
!= info
->ctime
||
7301 mddev
->level
!= info
->level
||
7302 /* mddev->layout != info->layout || */
7303 mddev
->persistent
!= !info
->not_persistent
||
7304 mddev
->chunk_sectors
!= info
->chunk_size
>> 9 ||
7305 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
7306 ((state
^info
->state
) & 0xfffffe00)
7309 /* Check there is only one change */
7310 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
7312 if (mddev
->raid_disks
!= info
->raid_disks
)
7314 if (mddev
->layout
!= info
->layout
)
7316 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
))
7323 if (mddev
->layout
!= info
->layout
) {
7325 * we don't need to do anything at the md level, the
7326 * personality will take care of it all.
7328 if (mddev
->pers
->check_reshape
== NULL
)
7331 mddev
->new_layout
= info
->layout
;
7332 rv
= mddev
->pers
->check_reshape(mddev
);
7334 mddev
->new_layout
= mddev
->layout
;
7338 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
7339 rv
= update_size(mddev
, (sector_t
)info
->size
* 2);
7341 if (mddev
->raid_disks
!= info
->raid_disks
)
7342 rv
= update_raid_disks(mddev
, info
->raid_disks
);
7344 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) {
7345 if (mddev
->pers
->quiesce
== NULL
|| mddev
->thread
== NULL
) {
7349 if (mddev
->recovery
|| mddev
->sync_thread
) {
7353 if (info
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
7354 struct bitmap
*bitmap
;
7355 /* add the bitmap */
7356 if (mddev
->bitmap
) {
7360 if (mddev
->bitmap_info
.default_offset
== 0) {
7364 mddev
->bitmap_info
.offset
=
7365 mddev
->bitmap_info
.default_offset
;
7366 mddev
->bitmap_info
.space
=
7367 mddev
->bitmap_info
.default_space
;
7368 bitmap
= md_bitmap_create(mddev
, -1);
7369 mddev_suspend(mddev
);
7370 if (!IS_ERR(bitmap
)) {
7371 mddev
->bitmap
= bitmap
;
7372 rv
= md_bitmap_load(mddev
);
7374 rv
= PTR_ERR(bitmap
);
7376 md_bitmap_destroy(mddev
);
7377 mddev_resume(mddev
);
7379 /* remove the bitmap */
7380 if (!mddev
->bitmap
) {
7384 if (mddev
->bitmap
->storage
.file
) {
7388 if (mddev
->bitmap_info
.nodes
) {
7389 /* hold PW on all the bitmap lock */
7390 if (md_cluster_ops
->lock_all_bitmaps(mddev
) <= 0) {
7391 pr_warn("md: can't change bitmap to none since the array is in use by more than one node\n");
7393 md_cluster_ops
->unlock_all_bitmaps(mddev
);
7397 mddev
->bitmap_info
.nodes
= 0;
7398 md_cluster_ops
->leave(mddev
);
7399 module_put(md_cluster_mod
);
7400 mddev
->safemode_delay
= DEFAULT_SAFEMODE_DELAY
;
7402 mddev_suspend(mddev
);
7403 md_bitmap_destroy(mddev
);
7404 mddev_resume(mddev
);
7405 mddev
->bitmap_info
.offset
= 0;
7408 md_update_sb(mddev
, 1);
7414 static int set_disk_faulty(struct mddev
*mddev
, dev_t dev
)
7416 struct md_rdev
*rdev
;
7419 if (mddev
->pers
== NULL
)
7423 rdev
= md_find_rdev_rcu(mddev
, dev
);
7427 md_error(mddev
, rdev
);
7428 if (!test_bit(Faulty
, &rdev
->flags
))
7436 * We have a problem here : there is no easy way to give a CHS
7437 * virtual geometry. We currently pretend that we have a 2 heads
7438 * 4 sectors (with a BIG number of cylinders...). This drives
7439 * dosfs just mad... ;-)
7441 static int md_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
7443 struct mddev
*mddev
= bdev
->bd_disk
->private_data
;
7447 geo
->cylinders
= mddev
->array_sectors
/ 8;
7451 static inline bool md_ioctl_valid(unsigned int cmd
)
7455 case GET_ARRAY_INFO
:
7456 case GET_BITMAP_FILE
:
7459 case HOT_REMOVE_DISK
:
7461 case RESTART_ARRAY_RW
:
7463 case SET_ARRAY_INFO
:
7464 case SET_BITMAP_FILE
:
7465 case SET_DISK_FAULTY
:
7468 case CLUSTERED_DISK_NACK
:
7475 static int md_ioctl(struct block_device
*bdev
, fmode_t mode
,
7476 unsigned int cmd
, unsigned long arg
)
7479 void __user
*argp
= (void __user
*)arg
;
7480 struct mddev
*mddev
= NULL
;
7481 bool did_set_md_closing
= false;
7483 if (!md_ioctl_valid(cmd
))
7488 case GET_ARRAY_INFO
:
7492 if (!capable(CAP_SYS_ADMIN
))
7497 * Commands dealing with the RAID driver but not any
7502 err
= get_version(argp
);
7508 * Commands creating/starting a new array:
7511 mddev
= bdev
->bd_disk
->private_data
;
7518 /* Some actions do not requires the mutex */
7520 case GET_ARRAY_INFO
:
7521 if (!mddev
->raid_disks
&& !mddev
->external
)
7524 err
= get_array_info(mddev
, argp
);
7528 if (!mddev
->raid_disks
&& !mddev
->external
)
7531 err
= get_disk_info(mddev
, argp
);
7534 case SET_DISK_FAULTY
:
7535 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
7538 case GET_BITMAP_FILE
:
7539 err
= get_bitmap_file(mddev
, argp
);
7544 if (cmd
== ADD_NEW_DISK
|| cmd
== HOT_ADD_DISK
)
7545 flush_rdev_wq(mddev
);
7547 if (cmd
== HOT_REMOVE_DISK
)
7548 /* need to ensure recovery thread has run */
7549 wait_event_interruptible_timeout(mddev
->sb_wait
,
7550 !test_bit(MD_RECOVERY_NEEDED
,
7552 msecs_to_jiffies(5000));
7553 if (cmd
== STOP_ARRAY
|| cmd
== STOP_ARRAY_RO
) {
7554 /* Need to flush page cache, and ensure no-one else opens
7557 mutex_lock(&mddev
->open_mutex
);
7558 if (mddev
->pers
&& atomic_read(&mddev
->openers
) > 1) {
7559 mutex_unlock(&mddev
->open_mutex
);
7563 if (test_and_set_bit(MD_CLOSING
, &mddev
->flags
)) {
7564 mutex_unlock(&mddev
->open_mutex
);
7568 did_set_md_closing
= true;
7569 mutex_unlock(&mddev
->open_mutex
);
7570 sync_blockdev(bdev
);
7572 err
= mddev_lock(mddev
);
7574 pr_debug("md: ioctl lock interrupted, reason %d, cmd %d\n",
7579 if (cmd
== SET_ARRAY_INFO
) {
7580 mdu_array_info_t info
;
7582 memset(&info
, 0, sizeof(info
));
7583 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
7588 err
= update_array_info(mddev
, &info
);
7590 pr_warn("md: couldn't update array info. %d\n", err
);
7595 if (!list_empty(&mddev
->disks
)) {
7596 pr_warn("md: array %s already has disks!\n", mdname(mddev
));
7600 if (mddev
->raid_disks
) {
7601 pr_warn("md: array %s already initialised!\n", mdname(mddev
));
7605 err
= md_set_array_info(mddev
, &info
);
7607 pr_warn("md: couldn't set array info. %d\n", err
);
7614 * Commands querying/configuring an existing array:
7616 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
7617 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
7618 if ((!mddev
->raid_disks
&& !mddev
->external
)
7619 && cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
7620 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
7621 && cmd
!= GET_BITMAP_FILE
) {
7627 * Commands even a read-only array can execute:
7630 case RESTART_ARRAY_RW
:
7631 err
= restart_array(mddev
);
7635 err
= do_md_stop(mddev
, 0, bdev
);
7639 err
= md_set_readonly(mddev
, bdev
);
7642 case HOT_REMOVE_DISK
:
7643 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
7647 /* We can support ADD_NEW_DISK on read-only arrays
7648 * only if we are re-adding a preexisting device.
7649 * So require mddev->pers and MD_DISK_SYNC.
7652 mdu_disk_info_t info
;
7653 if (copy_from_user(&info
, argp
, sizeof(info
)))
7655 else if (!(info
.state
& (1<<MD_DISK_SYNC
)))
7656 /* Need to clear read-only for this */
7659 err
= md_add_new_disk(mddev
, &info
);
7666 * The remaining ioctls are changing the state of the
7667 * superblock, so we do not allow them on read-only arrays.
7669 if (mddev
->ro
&& mddev
->pers
) {
7670 if (mddev
->ro
== 2) {
7672 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7673 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7674 /* mddev_unlock will wake thread */
7675 /* If a device failed while we were read-only, we
7676 * need to make sure the metadata is updated now.
7678 if (test_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
)) {
7679 mddev_unlock(mddev
);
7680 wait_event(mddev
->sb_wait
,
7681 !test_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
) &&
7682 !test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
));
7683 mddev_lock_nointr(mddev
);
7694 mdu_disk_info_t info
;
7695 if (copy_from_user(&info
, argp
, sizeof(info
)))
7698 err
= md_add_new_disk(mddev
, &info
);
7702 case CLUSTERED_DISK_NACK
:
7703 if (mddev_is_clustered(mddev
))
7704 md_cluster_ops
->new_disk_ack(mddev
, false);
7710 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
7714 err
= do_md_run(mddev
);
7717 case SET_BITMAP_FILE
:
7718 err
= set_bitmap_file(mddev
, (int)arg
);
7727 if (mddev
->hold_active
== UNTIL_IOCTL
&&
7729 mddev
->hold_active
= 0;
7730 mddev_unlock(mddev
);
7732 if(did_set_md_closing
)
7733 clear_bit(MD_CLOSING
, &mddev
->flags
);
7736 #ifdef CONFIG_COMPAT
7737 static int md_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
7738 unsigned int cmd
, unsigned long arg
)
7741 case HOT_REMOVE_DISK
:
7743 case SET_DISK_FAULTY
:
7744 case SET_BITMAP_FILE
:
7745 /* These take in integer arg, do not convert */
7748 arg
= (unsigned long)compat_ptr(arg
);
7752 return md_ioctl(bdev
, mode
, cmd
, arg
);
7754 #endif /* CONFIG_COMPAT */
7756 static int md_set_read_only(struct block_device
*bdev
, bool ro
)
7758 struct mddev
*mddev
= bdev
->bd_disk
->private_data
;
7761 err
= mddev_lock(mddev
);
7765 if (!mddev
->raid_disks
&& !mddev
->external
) {
7771 * Transitioning to read-auto need only happen for arrays that call
7772 * md_write_start and which are not ready for writes yet.
7774 if (!ro
&& mddev
->ro
== 1 && mddev
->pers
) {
7775 err
= restart_array(mddev
);
7782 mddev_unlock(mddev
);
7786 static int md_open(struct block_device
*bdev
, fmode_t mode
)
7789 * Succeed if we can lock the mddev, which confirms that
7790 * it isn't being stopped right now.
7792 struct mddev
*mddev
= mddev_find(bdev
->bd_dev
);
7798 if (mddev
->gendisk
!= bdev
->bd_disk
) {
7799 /* we are racing with mddev_put which is discarding this
7803 /* Wait until bdev->bd_disk is definitely gone */
7804 if (work_pending(&mddev
->del_work
))
7805 flush_workqueue(md_misc_wq
);
7808 BUG_ON(mddev
!= bdev
->bd_disk
->private_data
);
7810 if ((err
= mutex_lock_interruptible(&mddev
->open_mutex
)))
7813 if (test_bit(MD_CLOSING
, &mddev
->flags
)) {
7814 mutex_unlock(&mddev
->open_mutex
);
7820 atomic_inc(&mddev
->openers
);
7821 mutex_unlock(&mddev
->open_mutex
);
7823 bdev_check_media_change(bdev
);
7830 static void md_release(struct gendisk
*disk
, fmode_t mode
)
7832 struct mddev
*mddev
= disk
->private_data
;
7835 atomic_dec(&mddev
->openers
);
7839 static unsigned int md_check_events(struct gendisk
*disk
, unsigned int clearing
)
7841 struct mddev
*mddev
= disk
->private_data
;
7842 unsigned int ret
= 0;
7845 ret
= DISK_EVENT_MEDIA_CHANGE
;
7850 const struct block_device_operations md_fops
=
7852 .owner
= THIS_MODULE
,
7853 .submit_bio
= md_submit_bio
,
7855 .release
= md_release
,
7857 #ifdef CONFIG_COMPAT
7858 .compat_ioctl
= md_compat_ioctl
,
7860 .getgeo
= md_getgeo
,
7861 .check_events
= md_check_events
,
7862 .set_read_only
= md_set_read_only
,
7865 static int md_thread(void *arg
)
7867 struct md_thread
*thread
= arg
;
7870 * md_thread is a 'system-thread', it's priority should be very
7871 * high. We avoid resource deadlocks individually in each
7872 * raid personality. (RAID5 does preallocation) We also use RR and
7873 * the very same RT priority as kswapd, thus we will never get
7874 * into a priority inversion deadlock.
7876 * we definitely have to have equal or higher priority than
7877 * bdflush, otherwise bdflush will deadlock if there are too
7878 * many dirty RAID5 blocks.
7881 allow_signal(SIGKILL
);
7882 while (!kthread_should_stop()) {
7884 /* We need to wait INTERRUPTIBLE so that
7885 * we don't add to the load-average.
7886 * That means we need to be sure no signals are
7889 if (signal_pending(current
))
7890 flush_signals(current
);
7892 wait_event_interruptible_timeout
7894 test_bit(THREAD_WAKEUP
, &thread
->flags
)
7895 || kthread_should_stop() || kthread_should_park(),
7898 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
7899 if (kthread_should_park())
7901 if (!kthread_should_stop())
7902 thread
->run(thread
);
7908 void md_wakeup_thread(struct md_thread
*thread
)
7911 pr_debug("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
7912 set_bit(THREAD_WAKEUP
, &thread
->flags
);
7913 wake_up(&thread
->wqueue
);
7916 EXPORT_SYMBOL(md_wakeup_thread
);
7918 struct md_thread
*md_register_thread(void (*run
) (struct md_thread
*),
7919 struct mddev
*mddev
, const char *name
)
7921 struct md_thread
*thread
;
7923 thread
= kzalloc(sizeof(struct md_thread
), GFP_KERNEL
);
7927 init_waitqueue_head(&thread
->wqueue
);
7930 thread
->mddev
= mddev
;
7931 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
7932 thread
->tsk
= kthread_run(md_thread
, thread
,
7934 mdname(thread
->mddev
),
7936 if (IS_ERR(thread
->tsk
)) {
7942 EXPORT_SYMBOL(md_register_thread
);
7944 void md_unregister_thread(struct md_thread
**threadp
)
7946 struct md_thread
*thread
= *threadp
;
7949 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread
->tsk
));
7950 /* Locking ensures that mddev_unlock does not wake_up a
7951 * non-existent thread
7953 spin_lock(&pers_lock
);
7955 spin_unlock(&pers_lock
);
7957 kthread_stop(thread
->tsk
);
7960 EXPORT_SYMBOL(md_unregister_thread
);
7962 void md_error(struct mddev
*mddev
, struct md_rdev
*rdev
)
7964 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
7967 if (!mddev
->pers
|| !mddev
->pers
->error_handler
)
7969 mddev
->pers
->error_handler(mddev
,rdev
);
7970 if (mddev
->degraded
)
7971 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7972 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
7973 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7974 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7975 md_wakeup_thread(mddev
->thread
);
7976 if (mddev
->event_work
.func
)
7977 queue_work(md_misc_wq
, &mddev
->event_work
);
7978 md_new_event(mddev
);
7980 EXPORT_SYMBOL(md_error
);
7982 /* seq_file implementation /proc/mdstat */
7984 static void status_unused(struct seq_file
*seq
)
7987 struct md_rdev
*rdev
;
7989 seq_printf(seq
, "unused devices: ");
7991 list_for_each_entry(rdev
, &pending_raid_disks
, same_set
) {
7992 char b
[BDEVNAME_SIZE
];
7994 seq_printf(seq
, "%s ",
7995 bdevname(rdev
->bdev
,b
));
7998 seq_printf(seq
, "<none>");
8000 seq_printf(seq
, "\n");
8003 static int status_resync(struct seq_file
*seq
, struct mddev
*mddev
)
8005 sector_t max_sectors
, resync
, res
;
8006 unsigned long dt
, db
= 0;
8007 sector_t rt
, curr_mark_cnt
, resync_mark_cnt
;
8008 int scale
, recovery_active
;
8009 unsigned int per_milli
;
8011 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
8012 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
8013 max_sectors
= mddev
->resync_max_sectors
;
8015 max_sectors
= mddev
->dev_sectors
;
8017 resync
= mddev
->curr_resync
;
8019 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
8020 /* Still cleaning up */
8021 resync
= max_sectors
;
8022 } else if (resync
> max_sectors
)
8023 resync
= max_sectors
;
8025 resync
-= atomic_read(&mddev
->recovery_active
);
8028 if (test_bit(MD_RESYNCING_REMOTE
, &mddev
->recovery
)) {
8029 struct md_rdev
*rdev
;
8031 rdev_for_each(rdev
, mddev
)
8032 if (rdev
->raid_disk
>= 0 &&
8033 !test_bit(Faulty
, &rdev
->flags
) &&
8034 rdev
->recovery_offset
!= MaxSector
&&
8035 rdev
->recovery_offset
) {
8036 seq_printf(seq
, "\trecover=REMOTE");
8039 if (mddev
->reshape_position
!= MaxSector
)
8040 seq_printf(seq
, "\treshape=REMOTE");
8042 seq_printf(seq
, "\tresync=REMOTE");
8045 if (mddev
->recovery_cp
< MaxSector
) {
8046 seq_printf(seq
, "\tresync=PENDING");
8052 seq_printf(seq
, "\tresync=DELAYED");
8056 WARN_ON(max_sectors
== 0);
8057 /* Pick 'scale' such that (resync>>scale)*1000 will fit
8058 * in a sector_t, and (max_sectors>>scale) will fit in a
8059 * u32, as those are the requirements for sector_div.
8060 * Thus 'scale' must be at least 10
8063 if (sizeof(sector_t
) > sizeof(unsigned long)) {
8064 while ( max_sectors
/2 > (1ULL<<(scale
+32)))
8067 res
= (resync
>>scale
)*1000;
8068 sector_div(res
, (u32
)((max_sectors
>>scale
)+1));
8072 int i
, x
= per_milli
/50, y
= 20-x
;
8073 seq_printf(seq
, "[");
8074 for (i
= 0; i
< x
; i
++)
8075 seq_printf(seq
, "=");
8076 seq_printf(seq
, ">");
8077 for (i
= 0; i
< y
; i
++)
8078 seq_printf(seq
, ".");
8079 seq_printf(seq
, "] ");
8081 seq_printf(seq
, " %s =%3u.%u%% (%llu/%llu)",
8082 (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)?
8084 (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)?
8086 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
8087 "resync" : "recovery"))),
8088 per_milli
/10, per_milli
% 10,
8089 (unsigned long long) resync
/2,
8090 (unsigned long long) max_sectors
/2);
8093 * dt: time from mark until now
8094 * db: blocks written from mark until now
8095 * rt: remaining time
8097 * rt is a sector_t, which is always 64bit now. We are keeping
8098 * the original algorithm, but it is not really necessary.
8100 * Original algorithm:
8101 * So we divide before multiply in case it is 32bit and close
8103 * We scale the divisor (db) by 32 to avoid losing precision
8104 * near the end of resync when the number of remaining sectors
8106 * We then divide rt by 32 after multiplying by db to compensate.
8107 * The '+1' avoids division by zero if db is very small.
8109 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
8112 curr_mark_cnt
= mddev
->curr_mark_cnt
;
8113 recovery_active
= atomic_read(&mddev
->recovery_active
);
8114 resync_mark_cnt
= mddev
->resync_mark_cnt
;
8116 if (curr_mark_cnt
>= (recovery_active
+ resync_mark_cnt
))
8117 db
= curr_mark_cnt
- (recovery_active
+ resync_mark_cnt
);
8119 rt
= max_sectors
- resync
; /* number of remaining sectors */
8120 rt
= div64_u64(rt
, db
/32+1);
8124 seq_printf(seq
, " finish=%lu.%lumin", (unsigned long)rt
/ 60,
8125 ((unsigned long)rt
% 60)/6);
8127 seq_printf(seq
, " speed=%ldK/sec", db
/2/dt
);
8131 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
8133 struct list_head
*tmp
;
8135 struct mddev
*mddev
;
8147 spin_lock(&all_mddevs_lock
);
8148 list_for_each(tmp
,&all_mddevs
)
8150 mddev
= list_entry(tmp
, struct mddev
, all_mddevs
);
8152 spin_unlock(&all_mddevs_lock
);
8155 spin_unlock(&all_mddevs_lock
);
8157 return (void*)2;/* tail */
8161 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
8163 struct list_head
*tmp
;
8164 struct mddev
*next_mddev
, *mddev
= v
;
8170 spin_lock(&all_mddevs_lock
);
8172 tmp
= all_mddevs
.next
;
8174 tmp
= mddev
->all_mddevs
.next
;
8175 if (tmp
!= &all_mddevs
)
8176 next_mddev
= mddev_get(list_entry(tmp
,struct mddev
,all_mddevs
));
8178 next_mddev
= (void*)2;
8181 spin_unlock(&all_mddevs_lock
);
8189 static void md_seq_stop(struct seq_file
*seq
, void *v
)
8191 struct mddev
*mddev
= v
;
8193 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
8197 static int md_seq_show(struct seq_file
*seq
, void *v
)
8199 struct mddev
*mddev
= v
;
8201 struct md_rdev
*rdev
;
8203 if (v
== (void*)1) {
8204 struct md_personality
*pers
;
8205 seq_printf(seq
, "Personalities : ");
8206 spin_lock(&pers_lock
);
8207 list_for_each_entry(pers
, &pers_list
, list
)
8208 seq_printf(seq
, "[%s] ", pers
->name
);
8210 spin_unlock(&pers_lock
);
8211 seq_printf(seq
, "\n");
8212 seq
->poll_event
= atomic_read(&md_event_count
);
8215 if (v
== (void*)2) {
8220 spin_lock(&mddev
->lock
);
8221 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
8222 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
8223 mddev
->pers
? "" : "in");
8226 seq_printf(seq
, " (read-only)");
8228 seq_printf(seq
, " (auto-read-only)");
8229 seq_printf(seq
, " %s", mddev
->pers
->name
);
8234 rdev_for_each_rcu(rdev
, mddev
) {
8235 char b
[BDEVNAME_SIZE
];
8236 seq_printf(seq
, " %s[%d]",
8237 bdevname(rdev
->bdev
,b
), rdev
->desc_nr
);
8238 if (test_bit(WriteMostly
, &rdev
->flags
))
8239 seq_printf(seq
, "(W)");
8240 if (test_bit(Journal
, &rdev
->flags
))
8241 seq_printf(seq
, "(J)");
8242 if (test_bit(Faulty
, &rdev
->flags
)) {
8243 seq_printf(seq
, "(F)");
8246 if (rdev
->raid_disk
< 0)
8247 seq_printf(seq
, "(S)"); /* spare */
8248 if (test_bit(Replacement
, &rdev
->flags
))
8249 seq_printf(seq
, "(R)");
8250 sectors
+= rdev
->sectors
;
8254 if (!list_empty(&mddev
->disks
)) {
8256 seq_printf(seq
, "\n %llu blocks",
8257 (unsigned long long)
8258 mddev
->array_sectors
/ 2);
8260 seq_printf(seq
, "\n %llu blocks",
8261 (unsigned long long)sectors
/ 2);
8263 if (mddev
->persistent
) {
8264 if (mddev
->major_version
!= 0 ||
8265 mddev
->minor_version
!= 90) {
8266 seq_printf(seq
," super %d.%d",
8267 mddev
->major_version
,
8268 mddev
->minor_version
);
8270 } else if (mddev
->external
)
8271 seq_printf(seq
, " super external:%s",
8272 mddev
->metadata_type
);
8274 seq_printf(seq
, " super non-persistent");
8277 mddev
->pers
->status(seq
, mddev
);
8278 seq_printf(seq
, "\n ");
8279 if (mddev
->pers
->sync_request
) {
8280 if (status_resync(seq
, mddev
))
8281 seq_printf(seq
, "\n ");
8284 seq_printf(seq
, "\n ");
8286 md_bitmap_status(seq
, mddev
->bitmap
);
8288 seq_printf(seq
, "\n");
8290 spin_unlock(&mddev
->lock
);
8295 static const struct seq_operations md_seq_ops
= {
8296 .start
= md_seq_start
,
8297 .next
= md_seq_next
,
8298 .stop
= md_seq_stop
,
8299 .show
= md_seq_show
,
8302 static int md_seq_open(struct inode
*inode
, struct file
*file
)
8304 struct seq_file
*seq
;
8307 error
= seq_open(file
, &md_seq_ops
);
8311 seq
= file
->private_data
;
8312 seq
->poll_event
= atomic_read(&md_event_count
);
8316 static int md_unloading
;
8317 static __poll_t
mdstat_poll(struct file
*filp
, poll_table
*wait
)
8319 struct seq_file
*seq
= filp
->private_data
;
8323 return EPOLLIN
|EPOLLRDNORM
|EPOLLERR
|EPOLLPRI
;
8324 poll_wait(filp
, &md_event_waiters
, wait
);
8326 /* always allow read */
8327 mask
= EPOLLIN
| EPOLLRDNORM
;
8329 if (seq
->poll_event
!= atomic_read(&md_event_count
))
8330 mask
|= EPOLLERR
| EPOLLPRI
;
8334 static const struct proc_ops mdstat_proc_ops
= {
8335 .proc_open
= md_seq_open
,
8336 .proc_read
= seq_read
,
8337 .proc_lseek
= seq_lseek
,
8338 .proc_release
= seq_release
,
8339 .proc_poll
= mdstat_poll
,
8342 int register_md_personality(struct md_personality
*p
)
8344 pr_debug("md: %s personality registered for level %d\n",
8346 spin_lock(&pers_lock
);
8347 list_add_tail(&p
->list
, &pers_list
);
8348 spin_unlock(&pers_lock
);
8351 EXPORT_SYMBOL(register_md_personality
);
8353 int unregister_md_personality(struct md_personality
*p
)
8355 pr_debug("md: %s personality unregistered\n", p
->name
);
8356 spin_lock(&pers_lock
);
8357 list_del_init(&p
->list
);
8358 spin_unlock(&pers_lock
);
8361 EXPORT_SYMBOL(unregister_md_personality
);
8363 int register_md_cluster_operations(struct md_cluster_operations
*ops
,
8364 struct module
*module
)
8367 spin_lock(&pers_lock
);
8368 if (md_cluster_ops
!= NULL
)
8371 md_cluster_ops
= ops
;
8372 md_cluster_mod
= module
;
8374 spin_unlock(&pers_lock
);
8377 EXPORT_SYMBOL(register_md_cluster_operations
);
8379 int unregister_md_cluster_operations(void)
8381 spin_lock(&pers_lock
);
8382 md_cluster_ops
= NULL
;
8383 spin_unlock(&pers_lock
);
8386 EXPORT_SYMBOL(unregister_md_cluster_operations
);
8388 int md_setup_cluster(struct mddev
*mddev
, int nodes
)
8391 if (!md_cluster_ops
)
8392 request_module("md-cluster");
8393 spin_lock(&pers_lock
);
8394 /* ensure module won't be unloaded */
8395 if (!md_cluster_ops
|| !try_module_get(md_cluster_mod
)) {
8396 pr_warn("can't find md-cluster module or get it's reference.\n");
8397 spin_unlock(&pers_lock
);
8400 spin_unlock(&pers_lock
);
8402 ret
= md_cluster_ops
->join(mddev
, nodes
);
8404 mddev
->safemode_delay
= 0;
8408 void md_cluster_stop(struct mddev
*mddev
)
8410 if (!md_cluster_ops
)
8412 md_cluster_ops
->leave(mddev
);
8413 module_put(md_cluster_mod
);
8416 static int is_mddev_idle(struct mddev
*mddev
, int init
)
8418 struct md_rdev
*rdev
;
8424 rdev_for_each_rcu(rdev
, mddev
) {
8425 struct gendisk
*disk
= rdev
->bdev
->bd_disk
;
8426 curr_events
= (int)part_stat_read_accum(disk
->part0
, sectors
) -
8427 atomic_read(&disk
->sync_io
);
8428 /* sync IO will cause sync_io to increase before the disk_stats
8429 * as sync_io is counted when a request starts, and
8430 * disk_stats is counted when it completes.
8431 * So resync activity will cause curr_events to be smaller than
8432 * when there was no such activity.
8433 * non-sync IO will cause disk_stat to increase without
8434 * increasing sync_io so curr_events will (eventually)
8435 * be larger than it was before. Once it becomes
8436 * substantially larger, the test below will cause
8437 * the array to appear non-idle, and resync will slow
8439 * If there is a lot of outstanding resync activity when
8440 * we set last_event to curr_events, then all that activity
8441 * completing might cause the array to appear non-idle
8442 * and resync will be slowed down even though there might
8443 * not have been non-resync activity. This will only
8444 * happen once though. 'last_events' will soon reflect
8445 * the state where there is little or no outstanding
8446 * resync requests, and further resync activity will
8447 * always make curr_events less than last_events.
8450 if (init
|| curr_events
- rdev
->last_events
> 64) {
8451 rdev
->last_events
= curr_events
;
8459 void md_done_sync(struct mddev
*mddev
, int blocks
, int ok
)
8461 /* another "blocks" (512byte) blocks have been synced */
8462 atomic_sub(blocks
, &mddev
->recovery_active
);
8463 wake_up(&mddev
->recovery_wait
);
8465 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8466 set_bit(MD_RECOVERY_ERROR
, &mddev
->recovery
);
8467 md_wakeup_thread(mddev
->thread
);
8468 // stop recovery, signal do_sync ....
8471 EXPORT_SYMBOL(md_done_sync
);
8473 /* md_write_start(mddev, bi)
8474 * If we need to update some array metadata (e.g. 'active' flag
8475 * in superblock) before writing, schedule a superblock update
8476 * and wait for it to complete.
8477 * A return value of 'false' means that the write wasn't recorded
8478 * and cannot proceed as the array is being suspend.
8480 bool md_write_start(struct mddev
*mddev
, struct bio
*bi
)
8484 if (bio_data_dir(bi
) != WRITE
)
8487 BUG_ON(mddev
->ro
== 1);
8488 if (mddev
->ro
== 2) {
8489 /* need to switch to read/write */
8491 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
8492 md_wakeup_thread(mddev
->thread
);
8493 md_wakeup_thread(mddev
->sync_thread
);
8497 percpu_ref_get(&mddev
->writes_pending
);
8498 smp_mb(); /* Match smp_mb in set_in_sync() */
8499 if (mddev
->safemode
== 1)
8500 mddev
->safemode
= 0;
8501 /* sync_checkers is always 0 when writes_pending is in per-cpu mode */
8502 if (mddev
->in_sync
|| mddev
->sync_checkers
) {
8503 spin_lock(&mddev
->lock
);
8504 if (mddev
->in_sync
) {
8506 set_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
8507 set_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
8508 md_wakeup_thread(mddev
->thread
);
8511 spin_unlock(&mddev
->lock
);
8515 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
8516 if (!mddev
->has_superblocks
)
8518 wait_event(mddev
->sb_wait
,
8519 !test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
) ||
8521 if (test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
)) {
8522 percpu_ref_put(&mddev
->writes_pending
);
8527 EXPORT_SYMBOL(md_write_start
);
8529 /* md_write_inc can only be called when md_write_start() has
8530 * already been called at least once of the current request.
8531 * It increments the counter and is useful when a single request
8532 * is split into several parts. Each part causes an increment and
8533 * so needs a matching md_write_end().
8534 * Unlike md_write_start(), it is safe to call md_write_inc() inside
8535 * a spinlocked region.
8537 void md_write_inc(struct mddev
*mddev
, struct bio
*bi
)
8539 if (bio_data_dir(bi
) != WRITE
)
8541 WARN_ON_ONCE(mddev
->in_sync
|| mddev
->ro
);
8542 percpu_ref_get(&mddev
->writes_pending
);
8544 EXPORT_SYMBOL(md_write_inc
);
8546 void md_write_end(struct mddev
*mddev
)
8548 percpu_ref_put(&mddev
->writes_pending
);
8550 if (mddev
->safemode
== 2)
8551 md_wakeup_thread(mddev
->thread
);
8552 else if (mddev
->safemode_delay
)
8553 /* The roundup() ensures this only performs locking once
8554 * every ->safemode_delay jiffies
8556 mod_timer(&mddev
->safemode_timer
,
8557 roundup(jiffies
, mddev
->safemode_delay
) +
8558 mddev
->safemode_delay
);
8561 EXPORT_SYMBOL(md_write_end
);
8563 /* This is used by raid0 and raid10 */
8564 void md_submit_discard_bio(struct mddev
*mddev
, struct md_rdev
*rdev
,
8565 struct bio
*bio
, sector_t start
, sector_t size
)
8567 struct bio
*discard_bio
= NULL
;
8569 if (__blkdev_issue_discard(rdev
->bdev
, start
, size
, GFP_NOIO
, 0,
8570 &discard_bio
) || !discard_bio
)
8573 bio_chain(discard_bio
, bio
);
8574 bio_clone_blkg_association(discard_bio
, bio
);
8576 trace_block_bio_remap(discard_bio
,
8577 disk_devt(mddev
->gendisk
),
8578 bio
->bi_iter
.bi_sector
);
8579 submit_bio_noacct(discard_bio
);
8581 EXPORT_SYMBOL_GPL(md_submit_discard_bio
);
8583 static void md_end_io_acct(struct bio
*bio
)
8585 struct md_io_acct
*md_io_acct
= bio
->bi_private
;
8586 struct bio
*orig_bio
= md_io_acct
->orig_bio
;
8588 orig_bio
->bi_status
= bio
->bi_status
;
8590 bio_end_io_acct(orig_bio
, md_io_acct
->start_time
);
8592 bio_endio(orig_bio
);
8596 * Used by personalities that don't already clone the bio and thus can't
8597 * easily add the timestamp to their extended bio structure.
8599 void md_account_bio(struct mddev
*mddev
, struct bio
**bio
)
8601 struct md_io_acct
*md_io_acct
;
8604 if (!blk_queue_io_stat((*bio
)->bi_bdev
->bd_disk
->queue
))
8607 clone
= bio_clone_fast(*bio
, GFP_NOIO
, &mddev
->io_acct_set
);
8608 md_io_acct
= container_of(clone
, struct md_io_acct
, bio_clone
);
8609 md_io_acct
->orig_bio
= *bio
;
8610 md_io_acct
->start_time
= bio_start_io_acct(*bio
);
8612 clone
->bi_end_io
= md_end_io_acct
;
8613 clone
->bi_private
= md_io_acct
;
8616 EXPORT_SYMBOL_GPL(md_account_bio
);
8618 /* md_allow_write(mddev)
8619 * Calling this ensures that the array is marked 'active' so that writes
8620 * may proceed without blocking. It is important to call this before
8621 * attempting a GFP_KERNEL allocation while holding the mddev lock.
8622 * Must be called with mddev_lock held.
8624 void md_allow_write(struct mddev
*mddev
)
8630 if (!mddev
->pers
->sync_request
)
8633 spin_lock(&mddev
->lock
);
8634 if (mddev
->in_sync
) {
8636 set_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
8637 set_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
8638 if (mddev
->safemode_delay
&&
8639 mddev
->safemode
== 0)
8640 mddev
->safemode
= 1;
8641 spin_unlock(&mddev
->lock
);
8642 md_update_sb(mddev
, 0);
8643 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
8644 /* wait for the dirty state to be recorded in the metadata */
8645 wait_event(mddev
->sb_wait
,
8646 !test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
));
8648 spin_unlock(&mddev
->lock
);
8650 EXPORT_SYMBOL_GPL(md_allow_write
);
8652 #define SYNC_MARKS 10
8653 #define SYNC_MARK_STEP (3*HZ)
8654 #define UPDATE_FREQUENCY (5*60*HZ)
8655 void md_do_sync(struct md_thread
*thread
)
8657 struct mddev
*mddev
= thread
->mddev
;
8658 struct mddev
*mddev2
;
8659 unsigned int currspeed
= 0, window
;
8660 sector_t max_sectors
,j
, io_sectors
, recovery_done
;
8661 unsigned long mark
[SYNC_MARKS
];
8662 unsigned long update_time
;
8663 sector_t mark_cnt
[SYNC_MARKS
];
8665 struct list_head
*tmp
;
8666 sector_t last_check
;
8668 struct md_rdev
*rdev
;
8669 char *desc
, *action
= NULL
;
8670 struct blk_plug plug
;
8673 /* just incase thread restarts... */
8674 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
8675 test_bit(MD_RECOVERY_WAIT
, &mddev
->recovery
))
8677 if (mddev
->ro
) {/* never try to sync a read-only array */
8678 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8682 if (mddev_is_clustered(mddev
)) {
8683 ret
= md_cluster_ops
->resync_start(mddev
);
8687 set_bit(MD_CLUSTER_RESYNC_LOCKED
, &mddev
->flags
);
8688 if (!(test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
8689 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) ||
8690 test_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
))
8691 && ((unsigned long long)mddev
->curr_resync_completed
8692 < (unsigned long long)mddev
->resync_max_sectors
))
8696 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
8697 if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)) {
8698 desc
= "data-check";
8700 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
8701 desc
= "requested-resync";
8705 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
8710 mddev
->last_sync_action
= action
?: desc
;
8712 /* we overload curr_resync somewhat here.
8713 * 0 == not engaged in resync at all
8714 * 2 == checking that there is no conflict with another sync
8715 * 1 == like 2, but have yielded to allow conflicting resync to
8717 * other == active in resync - this many blocks
8719 * Before starting a resync we must have set curr_resync to
8720 * 2, and then checked that every "conflicting" array has curr_resync
8721 * less than ours. When we find one that is the same or higher
8722 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
8723 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
8724 * This will mean we have to start checking from the beginning again.
8729 int mddev2_minor
= -1;
8730 mddev
->curr_resync
= 2;
8733 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
8735 for_each_mddev(mddev2
, tmp
) {
8736 if (mddev2
== mddev
)
8738 if (!mddev
->parallel_resync
8739 && mddev2
->curr_resync
8740 && match_mddev_units(mddev
, mddev2
)) {
8742 if (mddev
< mddev2
&& mddev
->curr_resync
== 2) {
8743 /* arbitrarily yield */
8744 mddev
->curr_resync
= 1;
8745 wake_up(&resync_wait
);
8747 if (mddev
> mddev2
&& mddev
->curr_resync
== 1)
8748 /* no need to wait here, we can wait the next
8749 * time 'round when curr_resync == 2
8752 /* We need to wait 'interruptible' so as not to
8753 * contribute to the load average, and not to
8754 * be caught by 'softlockup'
8756 prepare_to_wait(&resync_wait
, &wq
, TASK_INTERRUPTIBLE
);
8757 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
8758 mddev2
->curr_resync
>= mddev
->curr_resync
) {
8759 if (mddev2_minor
!= mddev2
->md_minor
) {
8760 mddev2_minor
= mddev2
->md_minor
;
8761 pr_info("md: delaying %s of %s until %s has finished (they share one or more physical units)\n",
8762 desc
, mdname(mddev
),
8766 if (signal_pending(current
))
8767 flush_signals(current
);
8769 finish_wait(&resync_wait
, &wq
);
8772 finish_wait(&resync_wait
, &wq
);
8775 } while (mddev
->curr_resync
< 2);
8778 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
8779 /* resync follows the size requested by the personality,
8780 * which defaults to physical size, but can be virtual size
8782 max_sectors
= mddev
->resync_max_sectors
;
8783 atomic64_set(&mddev
->resync_mismatches
, 0);
8784 /* we don't use the checkpoint if there's a bitmap */
8785 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
8786 j
= mddev
->resync_min
;
8787 else if (!mddev
->bitmap
)
8788 j
= mddev
->recovery_cp
;
8790 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)) {
8791 max_sectors
= mddev
->resync_max_sectors
;
8793 * If the original node aborts reshaping then we continue the
8794 * reshaping, so set j again to avoid restart reshape from the
8797 if (mddev_is_clustered(mddev
) &&
8798 mddev
->reshape_position
!= MaxSector
)
8799 j
= mddev
->reshape_position
;
8801 /* recovery follows the physical size of devices */
8802 max_sectors
= mddev
->dev_sectors
;
8805 rdev_for_each_rcu(rdev
, mddev
)
8806 if (rdev
->raid_disk
>= 0 &&
8807 !test_bit(Journal
, &rdev
->flags
) &&
8808 !test_bit(Faulty
, &rdev
->flags
) &&
8809 !test_bit(In_sync
, &rdev
->flags
) &&
8810 rdev
->recovery_offset
< j
)
8811 j
= rdev
->recovery_offset
;
8814 /* If there is a bitmap, we need to make sure all
8815 * writes that started before we added a spare
8816 * complete before we start doing a recovery.
8817 * Otherwise the write might complete and (via
8818 * bitmap_endwrite) set a bit in the bitmap after the
8819 * recovery has checked that bit and skipped that
8822 if (mddev
->bitmap
) {
8823 mddev
->pers
->quiesce(mddev
, 1);
8824 mddev
->pers
->quiesce(mddev
, 0);
8828 pr_info("md: %s of RAID array %s\n", desc
, mdname(mddev
));
8829 pr_debug("md: minimum _guaranteed_ speed: %d KB/sec/disk.\n", speed_min(mddev
));
8830 pr_debug("md: using maximum available idle IO bandwidth (but not more than %d KB/sec) for %s.\n",
8831 speed_max(mddev
), desc
);
8833 is_mddev_idle(mddev
, 1); /* this initializes IO event counters */
8836 for (m
= 0; m
< SYNC_MARKS
; m
++) {
8838 mark_cnt
[m
] = io_sectors
;
8841 mddev
->resync_mark
= mark
[last_mark
];
8842 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
8845 * Tune reconstruction:
8847 window
= 32 * (PAGE_SIZE
/ 512);
8848 pr_debug("md: using %dk window, over a total of %lluk.\n",
8849 window
/2, (unsigned long long)max_sectors
/2);
8851 atomic_set(&mddev
->recovery_active
, 0);
8855 pr_debug("md: resuming %s of %s from checkpoint.\n",
8856 desc
, mdname(mddev
));
8857 mddev
->curr_resync
= j
;
8859 mddev
->curr_resync
= 3; /* no longer delayed */
8860 mddev
->curr_resync_completed
= j
;
8861 sysfs_notify_dirent_safe(mddev
->sysfs_completed
);
8862 md_new_event(mddev
);
8863 update_time
= jiffies
;
8865 blk_start_plug(&plug
);
8866 while (j
< max_sectors
) {
8871 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
8872 ((mddev
->curr_resync
> mddev
->curr_resync_completed
&&
8873 (mddev
->curr_resync
- mddev
->curr_resync_completed
)
8874 > (max_sectors
>> 4)) ||
8875 time_after_eq(jiffies
, update_time
+ UPDATE_FREQUENCY
) ||
8876 (j
- mddev
->curr_resync_completed
)*2
8877 >= mddev
->resync_max
- mddev
->curr_resync_completed
||
8878 mddev
->curr_resync_completed
> mddev
->resync_max
8880 /* time to update curr_resync_completed */
8881 wait_event(mddev
->recovery_wait
,
8882 atomic_read(&mddev
->recovery_active
) == 0);
8883 mddev
->curr_resync_completed
= j
;
8884 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) &&
8885 j
> mddev
->recovery_cp
)
8886 mddev
->recovery_cp
= j
;
8887 update_time
= jiffies
;
8888 set_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
8889 sysfs_notify_dirent_safe(mddev
->sysfs_completed
);
8892 while (j
>= mddev
->resync_max
&&
8893 !test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
8894 /* As this condition is controlled by user-space,
8895 * we can block indefinitely, so use '_interruptible'
8896 * to avoid triggering warnings.
8898 flush_signals(current
); /* just in case */
8899 wait_event_interruptible(mddev
->recovery_wait
,
8900 mddev
->resync_max
> j
8901 || test_bit(MD_RECOVERY_INTR
,
8905 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
8908 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
);
8910 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8914 if (!skipped
) { /* actual IO requested */
8915 io_sectors
+= sectors
;
8916 atomic_add(sectors
, &mddev
->recovery_active
);
8919 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
8923 if (j
> max_sectors
)
8924 /* when skipping, extra large numbers can be returned. */
8927 mddev
->curr_resync
= j
;
8928 mddev
->curr_mark_cnt
= io_sectors
;
8929 if (last_check
== 0)
8930 /* this is the earliest that rebuild will be
8931 * visible in /proc/mdstat
8933 md_new_event(mddev
);
8935 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
8938 last_check
= io_sectors
;
8940 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
8942 int next
= (last_mark
+1) % SYNC_MARKS
;
8944 mddev
->resync_mark
= mark
[next
];
8945 mddev
->resync_mark_cnt
= mark_cnt
[next
];
8946 mark
[next
] = jiffies
;
8947 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
8951 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
8955 * this loop exits only if either when we are slower than
8956 * the 'hard' speed limit, or the system was IO-idle for
8958 * the system might be non-idle CPU-wise, but we only care
8959 * about not overloading the IO subsystem. (things like an
8960 * e2fsck being done on the RAID array should execute fast)
8964 recovery_done
= io_sectors
- atomic_read(&mddev
->recovery_active
);
8965 currspeed
= ((unsigned long)(recovery_done
- mddev
->resync_mark_cnt
))/2
8966 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
8968 if (currspeed
> speed_min(mddev
)) {
8969 if (currspeed
> speed_max(mddev
)) {
8973 if (!is_mddev_idle(mddev
, 0)) {
8975 * Give other IO more of a chance.
8976 * The faster the devices, the less we wait.
8978 wait_event(mddev
->recovery_wait
,
8979 !atomic_read(&mddev
->recovery_active
));
8983 pr_info("md: %s: %s %s.\n",mdname(mddev
), desc
,
8984 test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)
8985 ? "interrupted" : "done");
8987 * this also signals 'finished resyncing' to md_stop
8989 blk_finish_plug(&plug
);
8990 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
8992 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
8993 !test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
8994 mddev
->curr_resync
> 3) {
8995 mddev
->curr_resync_completed
= mddev
->curr_resync
;
8996 sysfs_notify_dirent_safe(mddev
->sysfs_completed
);
8998 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
);
9000 if (!test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
) &&
9001 mddev
->curr_resync
> 3) {
9002 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
9003 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
9004 if (mddev
->curr_resync
>= mddev
->recovery_cp
) {
9005 pr_debug("md: checkpointing %s of %s.\n",
9006 desc
, mdname(mddev
));
9007 if (test_bit(MD_RECOVERY_ERROR
,
9009 mddev
->recovery_cp
=
9010 mddev
->curr_resync_completed
;
9012 mddev
->recovery_cp
=
9016 mddev
->recovery_cp
= MaxSector
;
9018 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
9019 mddev
->curr_resync
= MaxSector
;
9020 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
9021 test_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
)) {
9023 rdev_for_each_rcu(rdev
, mddev
)
9024 if (rdev
->raid_disk
>= 0 &&
9025 mddev
->delta_disks
>= 0 &&
9026 !test_bit(Journal
, &rdev
->flags
) &&
9027 !test_bit(Faulty
, &rdev
->flags
) &&
9028 !test_bit(In_sync
, &rdev
->flags
) &&
9029 rdev
->recovery_offset
< mddev
->curr_resync
)
9030 rdev
->recovery_offset
= mddev
->curr_resync
;
9036 /* set CHANGE_PENDING here since maybe another update is needed,
9037 * so other nodes are informed. It should be harmless for normal
9039 set_mask_bits(&mddev
->sb_flags
, 0,
9040 BIT(MD_SB_CHANGE_PENDING
) | BIT(MD_SB_CHANGE_DEVS
));
9042 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
9043 !test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
9044 mddev
->delta_disks
> 0 &&
9045 mddev
->pers
->finish_reshape
&&
9046 mddev
->pers
->size
&&
9048 mddev_lock_nointr(mddev
);
9049 md_set_array_sectors(mddev
, mddev
->pers
->size(mddev
, 0, 0));
9050 mddev_unlock(mddev
);
9051 if (!mddev_is_clustered(mddev
))
9052 set_capacity_and_notify(mddev
->gendisk
,
9053 mddev
->array_sectors
);
9056 spin_lock(&mddev
->lock
);
9057 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
9058 /* We completed so min/max setting can be forgotten if used. */
9059 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
9060 mddev
->resync_min
= 0;
9061 mddev
->resync_max
= MaxSector
;
9062 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
9063 mddev
->resync_min
= mddev
->curr_resync_completed
;
9064 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
9065 mddev
->curr_resync
= 0;
9066 spin_unlock(&mddev
->lock
);
9068 wake_up(&resync_wait
);
9069 md_wakeup_thread(mddev
->thread
);
9072 EXPORT_SYMBOL_GPL(md_do_sync
);
9074 static int remove_and_add_spares(struct mddev
*mddev
,
9075 struct md_rdev
*this)
9077 struct md_rdev
*rdev
;
9080 bool remove_some
= false;
9082 if (this && test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
9083 /* Mustn't remove devices when resync thread is running */
9086 rdev_for_each(rdev
, mddev
) {
9087 if ((this == NULL
|| rdev
== this) &&
9088 rdev
->raid_disk
>= 0 &&
9089 !test_bit(Blocked
, &rdev
->flags
) &&
9090 test_bit(Faulty
, &rdev
->flags
) &&
9091 atomic_read(&rdev
->nr_pending
)==0) {
9092 /* Faulty non-Blocked devices with nr_pending == 0
9093 * never get nr_pending incremented,
9094 * never get Faulty cleared, and never get Blocked set.
9095 * So we can synchronize_rcu now rather than once per device
9098 set_bit(RemoveSynchronized
, &rdev
->flags
);
9104 rdev_for_each(rdev
, mddev
) {
9105 if ((this == NULL
|| rdev
== this) &&
9106 rdev
->raid_disk
>= 0 &&
9107 !test_bit(Blocked
, &rdev
->flags
) &&
9108 ((test_bit(RemoveSynchronized
, &rdev
->flags
) ||
9109 (!test_bit(In_sync
, &rdev
->flags
) &&
9110 !test_bit(Journal
, &rdev
->flags
))) &&
9111 atomic_read(&rdev
->nr_pending
)==0)) {
9112 if (mddev
->pers
->hot_remove_disk(
9113 mddev
, rdev
) == 0) {
9114 sysfs_unlink_rdev(mddev
, rdev
);
9115 rdev
->saved_raid_disk
= rdev
->raid_disk
;
9116 rdev
->raid_disk
= -1;
9120 if (remove_some
&& test_bit(RemoveSynchronized
, &rdev
->flags
))
9121 clear_bit(RemoveSynchronized
, &rdev
->flags
);
9124 if (removed
&& mddev
->kobj
.sd
)
9125 sysfs_notify_dirent_safe(mddev
->sysfs_degraded
);
9127 if (this && removed
)
9130 rdev_for_each(rdev
, mddev
) {
9131 if (this && this != rdev
)
9133 if (test_bit(Candidate
, &rdev
->flags
))
9135 if (rdev
->raid_disk
>= 0 &&
9136 !test_bit(In_sync
, &rdev
->flags
) &&
9137 !test_bit(Journal
, &rdev
->flags
) &&
9138 !test_bit(Faulty
, &rdev
->flags
))
9140 if (rdev
->raid_disk
>= 0)
9142 if (test_bit(Faulty
, &rdev
->flags
))
9144 if (!test_bit(Journal
, &rdev
->flags
)) {
9146 ! (rdev
->saved_raid_disk
>= 0 &&
9147 !test_bit(Bitmap_sync
, &rdev
->flags
)))
9150 rdev
->recovery_offset
= 0;
9152 if (mddev
->pers
->hot_add_disk(mddev
, rdev
) == 0) {
9153 /* failure here is OK */
9154 sysfs_link_rdev(mddev
, rdev
);
9155 if (!test_bit(Journal
, &rdev
->flags
))
9157 md_new_event(mddev
);
9158 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
9163 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
9167 static void md_start_sync(struct work_struct
*ws
)
9169 struct mddev
*mddev
= container_of(ws
, struct mddev
, del_work
);
9171 mddev
->sync_thread
= md_register_thread(md_do_sync
,
9174 if (!mddev
->sync_thread
) {
9175 pr_warn("%s: could not start resync thread...\n",
9177 /* leave the spares where they are, it shouldn't hurt */
9178 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
9179 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
9180 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
9181 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
9182 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
9183 wake_up(&resync_wait
);
9184 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
9186 if (mddev
->sysfs_action
)
9187 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
9189 md_wakeup_thread(mddev
->sync_thread
);
9190 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
9191 md_new_event(mddev
);
9195 * This routine is regularly called by all per-raid-array threads to
9196 * deal with generic issues like resync and super-block update.
9197 * Raid personalities that don't have a thread (linear/raid0) do not
9198 * need this as they never do any recovery or update the superblock.
9200 * It does not do any resync itself, but rather "forks" off other threads
9201 * to do that as needed.
9202 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
9203 * "->recovery" and create a thread at ->sync_thread.
9204 * When the thread finishes it sets MD_RECOVERY_DONE
9205 * and wakeups up this thread which will reap the thread and finish up.
9206 * This thread also removes any faulty devices (with nr_pending == 0).
9208 * The overall approach is:
9209 * 1/ if the superblock needs updating, update it.
9210 * 2/ If a recovery thread is running, don't do anything else.
9211 * 3/ If recovery has finished, clean up, possibly marking spares active.
9212 * 4/ If there are any faulty devices, remove them.
9213 * 5/ If array is degraded, try to add spares devices
9214 * 6/ If array has spares or is not in-sync, start a resync thread.
9216 void md_check_recovery(struct mddev
*mddev
)
9218 if (test_bit(MD_ALLOW_SB_UPDATE
, &mddev
->flags
) && mddev
->sb_flags
) {
9219 /* Write superblock - thread that called mddev_suspend()
9220 * holds reconfig_mutex for us.
9222 set_bit(MD_UPDATING_SB
, &mddev
->flags
);
9223 smp_mb__after_atomic();
9224 if (test_bit(MD_ALLOW_SB_UPDATE
, &mddev
->flags
))
9225 md_update_sb(mddev
, 0);
9226 clear_bit_unlock(MD_UPDATING_SB
, &mddev
->flags
);
9227 wake_up(&mddev
->sb_wait
);
9230 if (mddev
->suspended
)
9234 md_bitmap_daemon_work(mddev
);
9236 if (signal_pending(current
)) {
9237 if (mddev
->pers
->sync_request
&& !mddev
->external
) {
9238 pr_debug("md: %s in immediate safe mode\n",
9240 mddev
->safemode
= 2;
9242 flush_signals(current
);
9245 if (mddev
->ro
&& !test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
9248 (mddev
->sb_flags
& ~ (1<<MD_SB_CHANGE_PENDING
)) ||
9249 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
9250 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
9251 (mddev
->external
== 0 && mddev
->safemode
== 1) ||
9252 (mddev
->safemode
== 2
9253 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
9257 if (mddev_trylock(mddev
)) {
9259 bool try_set_sync
= mddev
->safemode
!= 0;
9261 if (!mddev
->external
&& mddev
->safemode
== 1)
9262 mddev
->safemode
= 0;
9265 struct md_rdev
*rdev
;
9266 if (!mddev
->external
&& mddev
->in_sync
)
9267 /* 'Blocked' flag not needed as failed devices
9268 * will be recorded if array switched to read/write.
9269 * Leaving it set will prevent the device
9270 * from being removed.
9272 rdev_for_each(rdev
, mddev
)
9273 clear_bit(Blocked
, &rdev
->flags
);
9274 /* On a read-only array we can:
9275 * - remove failed devices
9276 * - add already-in_sync devices if the array itself
9278 * As we only add devices that are already in-sync,
9279 * we can activate the spares immediately.
9281 remove_and_add_spares(mddev
, NULL
);
9282 /* There is no thread, but we need to call
9283 * ->spare_active and clear saved_raid_disk
9285 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
9286 md_reap_sync_thread(mddev
);
9287 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
9288 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
9289 clear_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
9293 if (mddev_is_clustered(mddev
)) {
9294 struct md_rdev
*rdev
, *tmp
;
9295 /* kick the device if another node issued a
9298 rdev_for_each_safe(rdev
, tmp
, mddev
) {
9299 if (test_and_clear_bit(ClusterRemove
, &rdev
->flags
) &&
9300 rdev
->raid_disk
< 0)
9301 md_kick_rdev_from_array(rdev
);
9305 if (try_set_sync
&& !mddev
->external
&& !mddev
->in_sync
) {
9306 spin_lock(&mddev
->lock
);
9308 spin_unlock(&mddev
->lock
);
9311 if (mddev
->sb_flags
)
9312 md_update_sb(mddev
, 0);
9314 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
9315 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
9316 /* resync/recovery still happening */
9317 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
9320 if (mddev
->sync_thread
) {
9321 md_reap_sync_thread(mddev
);
9324 /* Set RUNNING before clearing NEEDED to avoid
9325 * any transients in the value of "sync_action".
9327 mddev
->curr_resync_completed
= 0;
9328 spin_lock(&mddev
->lock
);
9329 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
9330 spin_unlock(&mddev
->lock
);
9331 /* Clear some bits that don't mean anything, but
9334 clear_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
9335 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
9337 if (!test_and_clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
9338 test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
9340 /* no recovery is running.
9341 * remove any failed drives, then
9342 * add spares if possible.
9343 * Spares are also removed and re-added, to allow
9344 * the personality to fail the re-add.
9347 if (mddev
->reshape_position
!= MaxSector
) {
9348 if (mddev
->pers
->check_reshape
== NULL
||
9349 mddev
->pers
->check_reshape(mddev
) != 0)
9350 /* Cannot proceed */
9352 set_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
9353 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
9354 } else if ((spares
= remove_and_add_spares(mddev
, NULL
))) {
9355 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
9356 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
9357 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
9358 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
9359 } else if (mddev
->recovery_cp
< MaxSector
) {
9360 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
9361 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
9362 } else if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
9363 /* nothing to be done ... */
9366 if (mddev
->pers
->sync_request
) {
9368 /* We are adding a device or devices to an array
9369 * which has the bitmap stored on all devices.
9370 * So make sure all bitmap pages get written
9372 md_bitmap_write_all(mddev
->bitmap
);
9374 INIT_WORK(&mddev
->del_work
, md_start_sync
);
9375 queue_work(md_misc_wq
, &mddev
->del_work
);
9379 if (!mddev
->sync_thread
) {
9380 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
9381 wake_up(&resync_wait
);
9382 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
9384 if (mddev
->sysfs_action
)
9385 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
9388 wake_up(&mddev
->sb_wait
);
9389 mddev_unlock(mddev
);
9392 EXPORT_SYMBOL(md_check_recovery
);
9394 void md_reap_sync_thread(struct mddev
*mddev
)
9396 struct md_rdev
*rdev
;
9397 sector_t old_dev_sectors
= mddev
->dev_sectors
;
9398 bool is_reshaped
= false;
9400 /* resync has finished, collect result */
9401 md_unregister_thread(&mddev
->sync_thread
);
9402 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
9403 !test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
) &&
9404 mddev
->degraded
!= mddev
->raid_disks
) {
9406 /* activate any spares */
9407 if (mddev
->pers
->spare_active(mddev
)) {
9408 sysfs_notify_dirent_safe(mddev
->sysfs_degraded
);
9409 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
9412 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
9413 mddev
->pers
->finish_reshape
) {
9414 mddev
->pers
->finish_reshape(mddev
);
9415 if (mddev_is_clustered(mddev
))
9419 /* If array is no-longer degraded, then any saved_raid_disk
9420 * information must be scrapped.
9422 if (!mddev
->degraded
)
9423 rdev_for_each(rdev
, mddev
)
9424 rdev
->saved_raid_disk
= -1;
9426 md_update_sb(mddev
, 1);
9427 /* MD_SB_CHANGE_PENDING should be cleared by md_update_sb, so we can
9428 * call resync_finish here if MD_CLUSTER_RESYNC_LOCKED is set by
9430 if (test_and_clear_bit(MD_CLUSTER_RESYNC_LOCKED
, &mddev
->flags
))
9431 md_cluster_ops
->resync_finish(mddev
);
9432 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
9433 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
9434 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
9435 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
9436 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
9437 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
9439 * We call md_cluster_ops->update_size here because sync_size could
9440 * be changed by md_update_sb, and MD_RECOVERY_RESHAPE is cleared,
9441 * so it is time to update size across cluster.
9443 if (mddev_is_clustered(mddev
) && is_reshaped
9444 && !test_bit(MD_CLOSING
, &mddev
->flags
))
9445 md_cluster_ops
->update_size(mddev
, old_dev_sectors
);
9446 wake_up(&resync_wait
);
9447 /* flag recovery needed just to double check */
9448 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
9449 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
9450 md_new_event(mddev
);
9451 if (mddev
->event_work
.func
)
9452 queue_work(md_misc_wq
, &mddev
->event_work
);
9454 EXPORT_SYMBOL(md_reap_sync_thread
);
9456 void md_wait_for_blocked_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
9458 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
9459 wait_event_timeout(rdev
->blocked_wait
,
9460 !test_bit(Blocked
, &rdev
->flags
) &&
9461 !test_bit(BlockedBadBlocks
, &rdev
->flags
),
9462 msecs_to_jiffies(5000));
9463 rdev_dec_pending(rdev
, mddev
);
9465 EXPORT_SYMBOL(md_wait_for_blocked_rdev
);
9467 void md_finish_reshape(struct mddev
*mddev
)
9469 /* called be personality module when reshape completes. */
9470 struct md_rdev
*rdev
;
9472 rdev_for_each(rdev
, mddev
) {
9473 if (rdev
->data_offset
> rdev
->new_data_offset
)
9474 rdev
->sectors
+= rdev
->data_offset
- rdev
->new_data_offset
;
9476 rdev
->sectors
-= rdev
->new_data_offset
- rdev
->data_offset
;
9477 rdev
->data_offset
= rdev
->new_data_offset
;
9480 EXPORT_SYMBOL(md_finish_reshape
);
9482 /* Bad block management */
9484 /* Returns 1 on success, 0 on failure */
9485 int rdev_set_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
9488 struct mddev
*mddev
= rdev
->mddev
;
9491 s
+= rdev
->new_data_offset
;
9493 s
+= rdev
->data_offset
;
9494 rv
= badblocks_set(&rdev
->badblocks
, s
, sectors
, 0);
9496 /* Make sure they get written out promptly */
9497 if (test_bit(ExternalBbl
, &rdev
->flags
))
9498 sysfs_notify_dirent_safe(rdev
->sysfs_unack_badblocks
);
9499 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
9500 set_mask_bits(&mddev
->sb_flags
, 0,
9501 BIT(MD_SB_CHANGE_CLEAN
) | BIT(MD_SB_CHANGE_PENDING
));
9502 md_wakeup_thread(rdev
->mddev
->thread
);
9507 EXPORT_SYMBOL_GPL(rdev_set_badblocks
);
9509 int rdev_clear_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
9514 s
+= rdev
->new_data_offset
;
9516 s
+= rdev
->data_offset
;
9517 rv
= badblocks_clear(&rdev
->badblocks
, s
, sectors
);
9518 if ((rv
== 0) && test_bit(ExternalBbl
, &rdev
->flags
))
9519 sysfs_notify_dirent_safe(rdev
->sysfs_badblocks
);
9522 EXPORT_SYMBOL_GPL(rdev_clear_badblocks
);
9524 static int md_notify_reboot(struct notifier_block
*this,
9525 unsigned long code
, void *x
)
9527 struct list_head
*tmp
;
9528 struct mddev
*mddev
;
9531 for_each_mddev(mddev
, tmp
) {
9532 if (mddev_trylock(mddev
)) {
9534 __md_stop_writes(mddev
);
9535 if (mddev
->persistent
)
9536 mddev
->safemode
= 2;
9537 mddev_unlock(mddev
);
9542 * certain more exotic SCSI devices are known to be
9543 * volatile wrt too early system reboots. While the
9544 * right place to handle this issue is the given
9545 * driver, we do want to have a safe RAID driver ...
9553 static struct notifier_block md_notifier
= {
9554 .notifier_call
= md_notify_reboot
,
9556 .priority
= INT_MAX
, /* before any real devices */
9559 static void md_geninit(void)
9561 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
9563 proc_create("mdstat", S_IRUGO
, NULL
, &mdstat_proc_ops
);
9566 static int __init
md_init(void)
9570 md_wq
= alloc_workqueue("md", WQ_MEM_RECLAIM
, 0);
9574 md_misc_wq
= alloc_workqueue("md_misc", 0, 0);
9578 md_rdev_misc_wq
= alloc_workqueue("md_rdev_misc", 0, 0);
9579 if (!md_rdev_misc_wq
)
9580 goto err_rdev_misc_wq
;
9582 ret
= __register_blkdev(MD_MAJOR
, "md", md_probe
);
9586 ret
= __register_blkdev(0, "mdp", md_probe
);
9591 register_reboot_notifier(&md_notifier
);
9592 raid_table_header
= register_sysctl_table(raid_root_table
);
9598 unregister_blkdev(MD_MAJOR
, "md");
9600 destroy_workqueue(md_rdev_misc_wq
);
9602 destroy_workqueue(md_misc_wq
);
9604 destroy_workqueue(md_wq
);
9609 static void check_sb_changes(struct mddev
*mddev
, struct md_rdev
*rdev
)
9611 struct mdp_superblock_1
*sb
= page_address(rdev
->sb_page
);
9612 struct md_rdev
*rdev2
, *tmp
;
9614 char b
[BDEVNAME_SIZE
];
9617 * If size is changed in another node then we need to
9618 * do resize as well.
9620 if (mddev
->dev_sectors
!= le64_to_cpu(sb
->size
)) {
9621 ret
= mddev
->pers
->resize(mddev
, le64_to_cpu(sb
->size
));
9623 pr_info("md-cluster: resize failed\n");
9625 md_bitmap_update_sb(mddev
->bitmap
);
9628 /* Check for change of roles in the active devices */
9629 rdev_for_each_safe(rdev2
, tmp
, mddev
) {
9630 if (test_bit(Faulty
, &rdev2
->flags
))
9633 /* Check if the roles changed */
9634 role
= le16_to_cpu(sb
->dev_roles
[rdev2
->desc_nr
]);
9636 if (test_bit(Candidate
, &rdev2
->flags
)) {
9637 if (role
== 0xfffe) {
9638 pr_info("md: Removing Candidate device %s because add failed\n", bdevname(rdev2
->bdev
,b
));
9639 md_kick_rdev_from_array(rdev2
);
9643 clear_bit(Candidate
, &rdev2
->flags
);
9646 if (role
!= rdev2
->raid_disk
) {
9648 * got activated except reshape is happening.
9650 if (rdev2
->raid_disk
== -1 && role
!= 0xffff &&
9651 !(le32_to_cpu(sb
->feature_map
) &
9652 MD_FEATURE_RESHAPE_ACTIVE
)) {
9653 rdev2
->saved_raid_disk
= role
;
9654 ret
= remove_and_add_spares(mddev
, rdev2
);
9655 pr_info("Activated spare: %s\n",
9656 bdevname(rdev2
->bdev
,b
));
9657 /* wakeup mddev->thread here, so array could
9658 * perform resync with the new activated disk */
9659 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
9660 md_wakeup_thread(mddev
->thread
);
9663 * We just want to do the minimum to mark the disk
9664 * as faulty. The recovery is performed by the
9665 * one who initiated the error.
9667 if ((role
== 0xfffe) || (role
== 0xfffd)) {
9668 md_error(mddev
, rdev2
);
9669 clear_bit(Blocked
, &rdev2
->flags
);
9674 if (mddev
->raid_disks
!= le32_to_cpu(sb
->raid_disks
)) {
9675 ret
= update_raid_disks(mddev
, le32_to_cpu(sb
->raid_disks
));
9677 pr_warn("md: updating array disks failed. %d\n", ret
);
9681 * Since mddev->delta_disks has already updated in update_raid_disks,
9682 * so it is time to check reshape.
9684 if (test_bit(MD_RESYNCING_REMOTE
, &mddev
->recovery
) &&
9685 (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
9687 * reshape is happening in the remote node, we need to
9688 * update reshape_position and call start_reshape.
9690 mddev
->reshape_position
= le64_to_cpu(sb
->reshape_position
);
9691 if (mddev
->pers
->update_reshape_pos
)
9692 mddev
->pers
->update_reshape_pos(mddev
);
9693 if (mddev
->pers
->start_reshape
)
9694 mddev
->pers
->start_reshape(mddev
);
9695 } else if (test_bit(MD_RESYNCING_REMOTE
, &mddev
->recovery
) &&
9696 mddev
->reshape_position
!= MaxSector
&&
9697 !(le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
9698 /* reshape is just done in another node. */
9699 mddev
->reshape_position
= MaxSector
;
9700 if (mddev
->pers
->update_reshape_pos
)
9701 mddev
->pers
->update_reshape_pos(mddev
);
9704 /* Finally set the event to be up to date */
9705 mddev
->events
= le64_to_cpu(sb
->events
);
9708 static int read_rdev(struct mddev
*mddev
, struct md_rdev
*rdev
)
9711 struct page
*swapout
= rdev
->sb_page
;
9712 struct mdp_superblock_1
*sb
;
9714 /* Store the sb page of the rdev in the swapout temporary
9715 * variable in case we err in the future
9717 rdev
->sb_page
= NULL
;
9718 err
= alloc_disk_sb(rdev
);
9720 ClearPageUptodate(rdev
->sb_page
);
9721 rdev
->sb_loaded
= 0;
9722 err
= super_types
[mddev
->major_version
].
9723 load_super(rdev
, NULL
, mddev
->minor_version
);
9726 pr_warn("%s: %d Could not reload rdev(%d) err: %d. Restoring old values\n",
9727 __func__
, __LINE__
, rdev
->desc_nr
, err
);
9729 put_page(rdev
->sb_page
);
9730 rdev
->sb_page
= swapout
;
9731 rdev
->sb_loaded
= 1;
9735 sb
= page_address(rdev
->sb_page
);
9736 /* Read the offset unconditionally, even if MD_FEATURE_RECOVERY_OFFSET
9740 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RECOVERY_OFFSET
))
9741 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
9743 /* The other node finished recovery, call spare_active to set
9744 * device In_sync and mddev->degraded
9746 if (rdev
->recovery_offset
== MaxSector
&&
9747 !test_bit(In_sync
, &rdev
->flags
) &&
9748 mddev
->pers
->spare_active(mddev
))
9749 sysfs_notify_dirent_safe(mddev
->sysfs_degraded
);
9755 void md_reload_sb(struct mddev
*mddev
, int nr
)
9757 struct md_rdev
*rdev
;
9761 rdev_for_each_rcu(rdev
, mddev
) {
9762 if (rdev
->desc_nr
== nr
)
9766 if (!rdev
|| rdev
->desc_nr
!= nr
) {
9767 pr_warn("%s: %d Could not find rdev with nr %d\n", __func__
, __LINE__
, nr
);
9771 err
= read_rdev(mddev
, rdev
);
9775 check_sb_changes(mddev
, rdev
);
9777 /* Read all rdev's to update recovery_offset */
9778 rdev_for_each_rcu(rdev
, mddev
) {
9779 if (!test_bit(Faulty
, &rdev
->flags
))
9780 read_rdev(mddev
, rdev
);
9783 EXPORT_SYMBOL(md_reload_sb
);
9788 * Searches all registered partitions for autorun RAID arrays
9792 static DEFINE_MUTEX(detected_devices_mutex
);
9793 static LIST_HEAD(all_detected_devices
);
9794 struct detected_devices_node
{
9795 struct list_head list
;
9799 void md_autodetect_dev(dev_t dev
)
9801 struct detected_devices_node
*node_detected_dev
;
9803 node_detected_dev
= kzalloc(sizeof(*node_detected_dev
), GFP_KERNEL
);
9804 if (node_detected_dev
) {
9805 node_detected_dev
->dev
= dev
;
9806 mutex_lock(&detected_devices_mutex
);
9807 list_add_tail(&node_detected_dev
->list
, &all_detected_devices
);
9808 mutex_unlock(&detected_devices_mutex
);
9812 void md_autostart_arrays(int part
)
9814 struct md_rdev
*rdev
;
9815 struct detected_devices_node
*node_detected_dev
;
9817 int i_scanned
, i_passed
;
9822 pr_info("md: Autodetecting RAID arrays.\n");
9824 mutex_lock(&detected_devices_mutex
);
9825 while (!list_empty(&all_detected_devices
) && i_scanned
< INT_MAX
) {
9827 node_detected_dev
= list_entry(all_detected_devices
.next
,
9828 struct detected_devices_node
, list
);
9829 list_del(&node_detected_dev
->list
);
9830 dev
= node_detected_dev
->dev
;
9831 kfree(node_detected_dev
);
9832 mutex_unlock(&detected_devices_mutex
);
9833 rdev
= md_import_device(dev
,0, 90);
9834 mutex_lock(&detected_devices_mutex
);
9838 if (test_bit(Faulty
, &rdev
->flags
))
9841 set_bit(AutoDetected
, &rdev
->flags
);
9842 list_add(&rdev
->same_set
, &pending_raid_disks
);
9845 mutex_unlock(&detected_devices_mutex
);
9847 pr_debug("md: Scanned %d and added %d devices.\n", i_scanned
, i_passed
);
9849 autorun_devices(part
);
9852 #endif /* !MODULE */
9854 static __exit
void md_exit(void)
9856 struct mddev
*mddev
;
9857 struct list_head
*tmp
;
9860 unregister_blkdev(MD_MAJOR
,"md");
9861 unregister_blkdev(mdp_major
, "mdp");
9862 unregister_reboot_notifier(&md_notifier
);
9863 unregister_sysctl_table(raid_table_header
);
9865 /* We cannot unload the modules while some process is
9866 * waiting for us in select() or poll() - wake them up
9869 while (waitqueue_active(&md_event_waiters
)) {
9870 /* not safe to leave yet */
9871 wake_up(&md_event_waiters
);
9875 remove_proc_entry("mdstat", NULL
);
9877 for_each_mddev(mddev
, tmp
) {
9878 export_array(mddev
);
9880 mddev
->hold_active
= 0;
9882 * for_each_mddev() will call mddev_put() at the end of each
9883 * iteration. As the mddev is now fully clear, this will
9884 * schedule the mddev for destruction by a workqueue, and the
9885 * destroy_workqueue() below will wait for that to complete.
9888 destroy_workqueue(md_rdev_misc_wq
);
9889 destroy_workqueue(md_misc_wq
);
9890 destroy_workqueue(md_wq
);
9893 subsys_initcall(md_init
);
9894 module_exit(md_exit
)
9896 static int get_ro(char *buffer
, const struct kernel_param
*kp
)
9898 return sprintf(buffer
, "%d\n", start_readonly
);
9900 static int set_ro(const char *val
, const struct kernel_param
*kp
)
9902 return kstrtouint(val
, 10, (unsigned int *)&start_readonly
);
9905 module_param_call(start_ro
, set_ro
, get_ro
, NULL
, S_IRUSR
|S_IWUSR
);
9906 module_param(start_dirty_degraded
, int, S_IRUGO
|S_IWUSR
);
9907 module_param_call(new_array
, add_named_array
, NULL
, NULL
, S_IWUSR
);
9908 module_param(create_on_open
, bool, S_IRUSR
|S_IWUSR
);
9910 MODULE_LICENSE("GPL");
9911 MODULE_DESCRIPTION("MD RAID framework");
9913 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);