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;
343 struct bio
*bio_alloc_mddev(gfp_t gfp_mask
, int nr_iovecs
,
346 if (!mddev
|| !bioset_initialized(&mddev
->bio_set
))
347 return bio_alloc(gfp_mask
, nr_iovecs
);
349 return bio_alloc_bioset(gfp_mask
, nr_iovecs
, &mddev
->bio_set
);
351 EXPORT_SYMBOL_GPL(bio_alloc_mddev
);
353 static struct bio
*md_bio_alloc_sync(struct mddev
*mddev
)
355 if (!mddev
|| !bioset_initialized(&mddev
->sync_set
))
356 return bio_alloc(GFP_NOIO
, 1);
358 return bio_alloc_bioset(GFP_NOIO
, 1, &mddev
->sync_set
);
362 * We have a system wide 'event count' that is incremented
363 * on any 'interesting' event, and readers of /proc/mdstat
364 * can use 'poll' or 'select' to find out when the event
368 * start array, stop array, error, add device, remove device,
369 * start build, activate spare
371 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters
);
372 static atomic_t md_event_count
;
373 void md_new_event(struct mddev
*mddev
)
375 atomic_inc(&md_event_count
);
376 wake_up(&md_event_waiters
);
378 EXPORT_SYMBOL_GPL(md_new_event
);
381 * Enables to iterate over all existing md arrays
382 * all_mddevs_lock protects this list.
384 static LIST_HEAD(all_mddevs
);
385 static DEFINE_SPINLOCK(all_mddevs_lock
);
388 * iterates through all used mddevs in the system.
389 * We take care to grab the all_mddevs_lock whenever navigating
390 * the list, and to always hold a refcount when unlocked.
391 * Any code which breaks out of this loop while own
392 * a reference to the current mddev and must mddev_put it.
394 #define for_each_mddev(_mddev,_tmp) \
396 for (({ spin_lock(&all_mddevs_lock); \
397 _tmp = all_mddevs.next; \
399 ({ if (_tmp != &all_mddevs) \
400 mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\
401 spin_unlock(&all_mddevs_lock); \
402 if (_mddev) mddev_put(_mddev); \
403 _mddev = list_entry(_tmp, struct mddev, all_mddevs); \
404 _tmp != &all_mddevs;}); \
405 ({ spin_lock(&all_mddevs_lock); \
406 _tmp = _tmp->next;}) \
409 /* Rather than calling directly into the personality make_request function,
410 * IO requests come here first so that we can check if the device is
411 * being suspended pending a reconfiguration.
412 * We hold a refcount over the call to ->make_request. By the time that
413 * call has finished, the bio has been linked into some internal structure
414 * and so is visible to ->quiesce(), so we don't need the refcount any more.
416 static bool is_suspended(struct mddev
*mddev
, struct bio
*bio
)
418 if (mddev
->suspended
)
420 if (bio_data_dir(bio
) != WRITE
)
422 if (mddev
->suspend_lo
>= mddev
->suspend_hi
)
424 if (bio
->bi_iter
.bi_sector
>= mddev
->suspend_hi
)
426 if (bio_end_sector(bio
) < mddev
->suspend_lo
)
431 void md_handle_request(struct mddev
*mddev
, struct bio
*bio
)
435 if (is_suspended(mddev
, bio
)) {
438 prepare_to_wait(&mddev
->sb_wait
, &__wait
,
439 TASK_UNINTERRUPTIBLE
);
440 if (!is_suspended(mddev
, bio
))
446 finish_wait(&mddev
->sb_wait
, &__wait
);
448 atomic_inc(&mddev
->active_io
);
451 if (!mddev
->pers
->make_request(mddev
, bio
)) {
452 atomic_dec(&mddev
->active_io
);
453 wake_up(&mddev
->sb_wait
);
454 goto check_suspended
;
457 if (atomic_dec_and_test(&mddev
->active_io
) && mddev
->suspended
)
458 wake_up(&mddev
->sb_wait
);
460 EXPORT_SYMBOL(md_handle_request
);
464 bio_end_io_t
*orig_bi_end_io
;
465 void *orig_bi_private
;
466 struct block_device
*orig_bi_bdev
;
467 unsigned long start_time
;
470 static void md_end_io(struct bio
*bio
)
472 struct md_io
*md_io
= bio
->bi_private
;
473 struct mddev
*mddev
= md_io
->mddev
;
475 bio_end_io_acct_remapped(bio
, md_io
->start_time
, md_io
->orig_bi_bdev
);
477 bio
->bi_end_io
= md_io
->orig_bi_end_io
;
478 bio
->bi_private
= md_io
->orig_bi_private
;
480 mempool_free(md_io
, &mddev
->md_io_pool
);
486 static blk_qc_t
md_submit_bio(struct bio
*bio
)
488 const int rw
= bio_data_dir(bio
);
489 struct mddev
*mddev
= bio
->bi_bdev
->bd_disk
->private_data
;
491 if (mddev
== NULL
|| mddev
->pers
== NULL
) {
493 return BLK_QC_T_NONE
;
496 if (unlikely(test_bit(MD_BROKEN
, &mddev
->flags
)) && (rw
== WRITE
)) {
498 return BLK_QC_T_NONE
;
501 blk_queue_split(&bio
);
503 if (mddev
->ro
== 1 && unlikely(rw
== WRITE
)) {
504 if (bio_sectors(bio
) != 0)
505 bio
->bi_status
= BLK_STS_IOERR
;
507 return BLK_QC_T_NONE
;
510 if (bio
->bi_end_io
!= md_end_io
) {
513 md_io
= mempool_alloc(&mddev
->md_io_pool
, GFP_NOIO
);
514 md_io
->mddev
= mddev
;
515 md_io
->orig_bi_end_io
= bio
->bi_end_io
;
516 md_io
->orig_bi_private
= bio
->bi_private
;
517 md_io
->orig_bi_bdev
= bio
->bi_bdev
;
519 bio
->bi_end_io
= md_end_io
;
520 bio
->bi_private
= md_io
;
522 md_io
->start_time
= bio_start_io_acct(bio
);
525 /* bio could be mergeable after passing to underlayer */
526 bio
->bi_opf
&= ~REQ_NOMERGE
;
528 md_handle_request(mddev
, bio
);
530 return BLK_QC_T_NONE
;
533 /* mddev_suspend makes sure no new requests are submitted
534 * to the device, and that any requests that have been submitted
535 * are completely handled.
536 * Once mddev_detach() is called and completes, the module will be
539 void mddev_suspend(struct mddev
*mddev
)
541 WARN_ON_ONCE(mddev
->thread
&& current
== mddev
->thread
->tsk
);
542 lockdep_assert_held(&mddev
->reconfig_mutex
);
543 if (mddev
->suspended
++)
546 wake_up(&mddev
->sb_wait
);
547 set_bit(MD_ALLOW_SB_UPDATE
, &mddev
->flags
);
548 smp_mb__after_atomic();
549 wait_event(mddev
->sb_wait
, atomic_read(&mddev
->active_io
) == 0);
550 mddev
->pers
->quiesce(mddev
, 1);
551 clear_bit_unlock(MD_ALLOW_SB_UPDATE
, &mddev
->flags
);
552 wait_event(mddev
->sb_wait
, !test_bit(MD_UPDATING_SB
, &mddev
->flags
));
554 del_timer_sync(&mddev
->safemode_timer
);
555 /* restrict memory reclaim I/O during raid array is suspend */
556 mddev
->noio_flag
= memalloc_noio_save();
558 EXPORT_SYMBOL_GPL(mddev_suspend
);
560 void mddev_resume(struct mddev
*mddev
)
562 /* entred the memalloc scope from mddev_suspend() */
563 memalloc_noio_restore(mddev
->noio_flag
);
564 lockdep_assert_held(&mddev
->reconfig_mutex
);
565 if (--mddev
->suspended
)
567 wake_up(&mddev
->sb_wait
);
568 mddev
->pers
->quiesce(mddev
, 0);
570 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
571 md_wakeup_thread(mddev
->thread
);
572 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
574 EXPORT_SYMBOL_GPL(mddev_resume
);
577 * Generic flush handling for md
580 static void md_end_flush(struct bio
*bio
)
582 struct md_rdev
*rdev
= bio
->bi_private
;
583 struct mddev
*mddev
= rdev
->mddev
;
585 rdev_dec_pending(rdev
, mddev
);
587 if (atomic_dec_and_test(&mddev
->flush_pending
)) {
588 /* The pre-request flush has finished */
589 queue_work(md_wq
, &mddev
->flush_work
);
594 static void md_submit_flush_data(struct work_struct
*ws
);
596 static void submit_flushes(struct work_struct
*ws
)
598 struct mddev
*mddev
= container_of(ws
, struct mddev
, flush_work
);
599 struct md_rdev
*rdev
;
601 mddev
->start_flush
= ktime_get_boottime();
602 INIT_WORK(&mddev
->flush_work
, md_submit_flush_data
);
603 atomic_set(&mddev
->flush_pending
, 1);
605 rdev_for_each_rcu(rdev
, mddev
)
606 if (rdev
->raid_disk
>= 0 &&
607 !test_bit(Faulty
, &rdev
->flags
)) {
608 /* Take two references, one is dropped
609 * when request finishes, one after
610 * we reclaim rcu_read_lock
613 atomic_inc(&rdev
->nr_pending
);
614 atomic_inc(&rdev
->nr_pending
);
616 bi
= bio_alloc_mddev(GFP_NOIO
, 0, mddev
);
617 bi
->bi_end_io
= md_end_flush
;
618 bi
->bi_private
= rdev
;
619 bio_set_dev(bi
, rdev
->bdev
);
620 bi
->bi_opf
= REQ_OP_WRITE
| REQ_PREFLUSH
;
621 atomic_inc(&mddev
->flush_pending
);
624 rdev_dec_pending(rdev
, mddev
);
627 if (atomic_dec_and_test(&mddev
->flush_pending
))
628 queue_work(md_wq
, &mddev
->flush_work
);
631 static void md_submit_flush_data(struct work_struct
*ws
)
633 struct mddev
*mddev
= container_of(ws
, struct mddev
, flush_work
);
634 struct bio
*bio
= mddev
->flush_bio
;
637 * must reset flush_bio before calling into md_handle_request to avoid a
638 * deadlock, because other bios passed md_handle_request suspend check
639 * could wait for this and below md_handle_request could wait for those
640 * bios because of suspend check
642 spin_lock_irq(&mddev
->lock
);
643 mddev
->prev_flush_start
= mddev
->start_flush
;
644 mddev
->flush_bio
= NULL
;
645 spin_unlock_irq(&mddev
->lock
);
646 wake_up(&mddev
->sb_wait
);
648 if (bio
->bi_iter
.bi_size
== 0) {
649 /* an empty barrier - all done */
652 bio
->bi_opf
&= ~REQ_PREFLUSH
;
653 md_handle_request(mddev
, bio
);
658 * Manages consolidation of flushes and submitting any flushes needed for
659 * a bio with REQ_PREFLUSH. Returns true if the bio is finished or is
660 * being finished in another context. Returns false if the flushing is
661 * complete but still needs the I/O portion of the bio to be processed.
663 bool md_flush_request(struct mddev
*mddev
, struct bio
*bio
)
665 ktime_t req_start
= ktime_get_boottime();
666 spin_lock_irq(&mddev
->lock
);
667 /* flush requests wait until ongoing flush completes,
668 * hence coalescing all the pending requests.
670 wait_event_lock_irq(mddev
->sb_wait
,
672 ktime_before(req_start
, mddev
->prev_flush_start
),
674 /* new request after previous flush is completed */
675 if (ktime_after(req_start
, mddev
->prev_flush_start
)) {
676 WARN_ON(mddev
->flush_bio
);
677 mddev
->flush_bio
= bio
;
680 spin_unlock_irq(&mddev
->lock
);
683 INIT_WORK(&mddev
->flush_work
, submit_flushes
);
684 queue_work(md_wq
, &mddev
->flush_work
);
686 /* flush was performed for some other bio while we waited. */
687 if (bio
->bi_iter
.bi_size
== 0)
688 /* an empty barrier - all done */
691 bio
->bi_opf
&= ~REQ_PREFLUSH
;
697 EXPORT_SYMBOL(md_flush_request
);
699 static inline struct mddev
*mddev_get(struct mddev
*mddev
)
701 atomic_inc(&mddev
->active
);
705 static void mddev_delayed_delete(struct work_struct
*ws
);
707 static void mddev_put(struct mddev
*mddev
)
709 if (!atomic_dec_and_lock(&mddev
->active
, &all_mddevs_lock
))
711 if (!mddev
->raid_disks
&& list_empty(&mddev
->disks
) &&
712 mddev
->ctime
== 0 && !mddev
->hold_active
) {
713 /* Array is not configured at all, and not held active,
715 list_del_init(&mddev
->all_mddevs
);
718 * Call queue_work inside the spinlock so that
719 * flush_workqueue() after mddev_find will succeed in waiting
720 * for the work to be done.
722 INIT_WORK(&mddev
->del_work
, mddev_delayed_delete
);
723 queue_work(md_misc_wq
, &mddev
->del_work
);
725 spin_unlock(&all_mddevs_lock
);
728 static void md_safemode_timeout(struct timer_list
*t
);
730 void mddev_init(struct mddev
*mddev
)
732 kobject_init(&mddev
->kobj
, &md_ktype
);
733 mutex_init(&mddev
->open_mutex
);
734 mutex_init(&mddev
->reconfig_mutex
);
735 mutex_init(&mddev
->bitmap_info
.mutex
);
736 INIT_LIST_HEAD(&mddev
->disks
);
737 INIT_LIST_HEAD(&mddev
->all_mddevs
);
738 timer_setup(&mddev
->safemode_timer
, md_safemode_timeout
, 0);
739 atomic_set(&mddev
->active
, 1);
740 atomic_set(&mddev
->openers
, 0);
741 atomic_set(&mddev
->active_io
, 0);
742 spin_lock_init(&mddev
->lock
);
743 atomic_set(&mddev
->flush_pending
, 0);
744 init_waitqueue_head(&mddev
->sb_wait
);
745 init_waitqueue_head(&mddev
->recovery_wait
);
746 mddev
->reshape_position
= MaxSector
;
747 mddev
->reshape_backwards
= 0;
748 mddev
->last_sync_action
= "none";
749 mddev
->resync_min
= 0;
750 mddev
->resync_max
= MaxSector
;
751 mddev
->level
= LEVEL_NONE
;
753 EXPORT_SYMBOL_GPL(mddev_init
);
755 static struct mddev
*mddev_find(dev_t unit
)
757 struct mddev
*mddev
, *new = NULL
;
759 if (unit
&& MAJOR(unit
) != MD_MAJOR
)
760 unit
&= ~((1<<MdpMinorShift
)-1);
763 spin_lock(&all_mddevs_lock
);
766 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
767 if (mddev
->unit
== unit
) {
769 spin_unlock(&all_mddevs_lock
);
775 list_add(&new->all_mddevs
, &all_mddevs
);
776 spin_unlock(&all_mddevs_lock
);
777 new->hold_active
= UNTIL_IOCTL
;
781 /* find an unused unit number */
782 static int next_minor
= 512;
783 int start
= next_minor
;
787 dev
= MKDEV(MD_MAJOR
, next_minor
);
789 if (next_minor
> MINORMASK
)
791 if (next_minor
== start
) {
792 /* Oh dear, all in use. */
793 spin_unlock(&all_mddevs_lock
);
799 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
800 if (mddev
->unit
== dev
) {
806 new->md_minor
= MINOR(dev
);
807 new->hold_active
= UNTIL_STOP
;
808 list_add(&new->all_mddevs
, &all_mddevs
);
809 spin_unlock(&all_mddevs_lock
);
812 spin_unlock(&all_mddevs_lock
);
814 new = kzalloc(sizeof(*new), GFP_KERNEL
);
819 if (MAJOR(unit
) == MD_MAJOR
)
820 new->md_minor
= MINOR(unit
);
822 new->md_minor
= MINOR(unit
) >> MdpMinorShift
;
829 static struct attribute_group md_redundancy_group
;
831 void mddev_unlock(struct mddev
*mddev
)
833 if (mddev
->to_remove
) {
834 /* These cannot be removed under reconfig_mutex as
835 * an access to the files will try to take reconfig_mutex
836 * while holding the file unremovable, which leads to
838 * So hold set sysfs_active while the remove in happeing,
839 * and anything else which might set ->to_remove or my
840 * otherwise change the sysfs namespace will fail with
841 * -EBUSY if sysfs_active is still set.
842 * We set sysfs_active under reconfig_mutex and elsewhere
843 * test it under the same mutex to ensure its correct value
846 struct attribute_group
*to_remove
= mddev
->to_remove
;
847 mddev
->to_remove
= NULL
;
848 mddev
->sysfs_active
= 1;
849 mutex_unlock(&mddev
->reconfig_mutex
);
851 if (mddev
->kobj
.sd
) {
852 if (to_remove
!= &md_redundancy_group
)
853 sysfs_remove_group(&mddev
->kobj
, to_remove
);
854 if (mddev
->pers
== NULL
||
855 mddev
->pers
->sync_request
== NULL
) {
856 sysfs_remove_group(&mddev
->kobj
, &md_redundancy_group
);
857 if (mddev
->sysfs_action
)
858 sysfs_put(mddev
->sysfs_action
);
859 if (mddev
->sysfs_completed
)
860 sysfs_put(mddev
->sysfs_completed
);
861 if (mddev
->sysfs_degraded
)
862 sysfs_put(mddev
->sysfs_degraded
);
863 mddev
->sysfs_action
= NULL
;
864 mddev
->sysfs_completed
= NULL
;
865 mddev
->sysfs_degraded
= NULL
;
868 mddev
->sysfs_active
= 0;
870 mutex_unlock(&mddev
->reconfig_mutex
);
872 /* As we've dropped the mutex we need a spinlock to
873 * make sure the thread doesn't disappear
875 spin_lock(&pers_lock
);
876 md_wakeup_thread(mddev
->thread
);
877 wake_up(&mddev
->sb_wait
);
878 spin_unlock(&pers_lock
);
880 EXPORT_SYMBOL_GPL(mddev_unlock
);
882 struct md_rdev
*md_find_rdev_nr_rcu(struct mddev
*mddev
, int nr
)
884 struct md_rdev
*rdev
;
886 rdev_for_each_rcu(rdev
, mddev
)
887 if (rdev
->desc_nr
== nr
)
892 EXPORT_SYMBOL_GPL(md_find_rdev_nr_rcu
);
894 static struct md_rdev
*find_rdev(struct mddev
*mddev
, dev_t dev
)
896 struct md_rdev
*rdev
;
898 rdev_for_each(rdev
, mddev
)
899 if (rdev
->bdev
->bd_dev
== dev
)
905 struct md_rdev
*md_find_rdev_rcu(struct mddev
*mddev
, dev_t dev
)
907 struct md_rdev
*rdev
;
909 rdev_for_each_rcu(rdev
, mddev
)
910 if (rdev
->bdev
->bd_dev
== dev
)
915 EXPORT_SYMBOL_GPL(md_find_rdev_rcu
);
917 static struct md_personality
*find_pers(int level
, char *clevel
)
919 struct md_personality
*pers
;
920 list_for_each_entry(pers
, &pers_list
, list
) {
921 if (level
!= LEVEL_NONE
&& pers
->level
== level
)
923 if (strcmp(pers
->name
, clevel
)==0)
929 /* return the offset of the super block in 512byte sectors */
930 static inline sector_t
calc_dev_sboffset(struct md_rdev
*rdev
)
932 sector_t num_sectors
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
933 return MD_NEW_SIZE_SECTORS(num_sectors
);
936 static int alloc_disk_sb(struct md_rdev
*rdev
)
938 rdev
->sb_page
= alloc_page(GFP_KERNEL
);
944 void md_rdev_clear(struct md_rdev
*rdev
)
947 put_page(rdev
->sb_page
);
949 rdev
->sb_page
= NULL
;
954 put_page(rdev
->bb_page
);
955 rdev
->bb_page
= NULL
;
957 badblocks_exit(&rdev
->badblocks
);
959 EXPORT_SYMBOL_GPL(md_rdev_clear
);
961 static void super_written(struct bio
*bio
)
963 struct md_rdev
*rdev
= bio
->bi_private
;
964 struct mddev
*mddev
= rdev
->mddev
;
966 if (bio
->bi_status
) {
967 pr_err("md: %s gets error=%d\n", __func__
,
968 blk_status_to_errno(bio
->bi_status
));
969 md_error(mddev
, rdev
);
970 if (!test_bit(Faulty
, &rdev
->flags
)
971 && (bio
->bi_opf
& MD_FAILFAST
)) {
972 set_bit(MD_SB_NEED_REWRITE
, &mddev
->sb_flags
);
973 set_bit(LastDev
, &rdev
->flags
);
976 clear_bit(LastDev
, &rdev
->flags
);
978 if (atomic_dec_and_test(&mddev
->pending_writes
))
979 wake_up(&mddev
->sb_wait
);
980 rdev_dec_pending(rdev
, mddev
);
984 void md_super_write(struct mddev
*mddev
, struct md_rdev
*rdev
,
985 sector_t sector
, int size
, struct page
*page
)
987 /* write first size bytes of page to sector of rdev
988 * Increment mddev->pending_writes before returning
989 * and decrement it on completion, waking up sb_wait
990 * if zero is reached.
991 * If an error occurred, call md_error
999 if (test_bit(Faulty
, &rdev
->flags
))
1002 bio
= md_bio_alloc_sync(mddev
);
1004 atomic_inc(&rdev
->nr_pending
);
1006 bio_set_dev(bio
, rdev
->meta_bdev
? rdev
->meta_bdev
: rdev
->bdev
);
1007 bio
->bi_iter
.bi_sector
= sector
;
1008 bio_add_page(bio
, page
, size
, 0);
1009 bio
->bi_private
= rdev
;
1010 bio
->bi_end_io
= super_written
;
1012 if (test_bit(MD_FAILFAST_SUPPORTED
, &mddev
->flags
) &&
1013 test_bit(FailFast
, &rdev
->flags
) &&
1014 !test_bit(LastDev
, &rdev
->flags
))
1016 bio
->bi_opf
= REQ_OP_WRITE
| REQ_SYNC
| REQ_PREFLUSH
| REQ_FUA
| ff
;
1018 atomic_inc(&mddev
->pending_writes
);
1022 int md_super_wait(struct mddev
*mddev
)
1024 /* wait for all superblock writes that were scheduled to complete */
1025 wait_event(mddev
->sb_wait
, atomic_read(&mddev
->pending_writes
)==0);
1026 if (test_and_clear_bit(MD_SB_NEED_REWRITE
, &mddev
->sb_flags
))
1031 int sync_page_io(struct md_rdev
*rdev
, sector_t sector
, int size
,
1032 struct page
*page
, int op
, int op_flags
, bool metadata_op
)
1034 struct bio
*bio
= md_bio_alloc_sync(rdev
->mddev
);
1037 if (metadata_op
&& rdev
->meta_bdev
)
1038 bio_set_dev(bio
, rdev
->meta_bdev
);
1040 bio_set_dev(bio
, rdev
->bdev
);
1041 bio_set_op_attrs(bio
, op
, op_flags
);
1043 bio
->bi_iter
.bi_sector
= sector
+ rdev
->sb_start
;
1044 else if (rdev
->mddev
->reshape_position
!= MaxSector
&&
1045 (rdev
->mddev
->reshape_backwards
==
1046 (sector
>= rdev
->mddev
->reshape_position
)))
1047 bio
->bi_iter
.bi_sector
= sector
+ rdev
->new_data_offset
;
1049 bio
->bi_iter
.bi_sector
= sector
+ rdev
->data_offset
;
1050 bio_add_page(bio
, page
, size
, 0);
1052 submit_bio_wait(bio
);
1054 ret
= !bio
->bi_status
;
1058 EXPORT_SYMBOL_GPL(sync_page_io
);
1060 static int read_disk_sb(struct md_rdev
*rdev
, int size
)
1062 char b
[BDEVNAME_SIZE
];
1064 if (rdev
->sb_loaded
)
1067 if (!sync_page_io(rdev
, 0, size
, rdev
->sb_page
, REQ_OP_READ
, 0, true))
1069 rdev
->sb_loaded
= 1;
1073 pr_err("md: disabled device %s, could not read superblock.\n",
1074 bdevname(rdev
->bdev
,b
));
1078 static int md_uuid_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
1080 return sb1
->set_uuid0
== sb2
->set_uuid0
&&
1081 sb1
->set_uuid1
== sb2
->set_uuid1
&&
1082 sb1
->set_uuid2
== sb2
->set_uuid2
&&
1083 sb1
->set_uuid3
== sb2
->set_uuid3
;
1086 static int md_sb_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
1089 mdp_super_t
*tmp1
, *tmp2
;
1091 tmp1
= kmalloc(sizeof(*tmp1
),GFP_KERNEL
);
1092 tmp2
= kmalloc(sizeof(*tmp2
),GFP_KERNEL
);
1094 if (!tmp1
|| !tmp2
) {
1103 * nr_disks is not constant
1108 ret
= (memcmp(tmp1
, tmp2
, MD_SB_GENERIC_CONSTANT_WORDS
* 4) == 0);
1115 static u32
md_csum_fold(u32 csum
)
1117 csum
= (csum
& 0xffff) + (csum
>> 16);
1118 return (csum
& 0xffff) + (csum
>> 16);
1121 static unsigned int calc_sb_csum(mdp_super_t
*sb
)
1124 u32
*sb32
= (u32
*)sb
;
1126 unsigned int disk_csum
, csum
;
1128 disk_csum
= sb
->sb_csum
;
1131 for (i
= 0; i
< MD_SB_BYTES
/4 ; i
++)
1133 csum
= (newcsum
& 0xffffffff) + (newcsum
>>32);
1136 /* This used to use csum_partial, which was wrong for several
1137 * reasons including that different results are returned on
1138 * different architectures. It isn't critical that we get exactly
1139 * the same return value as before (we always csum_fold before
1140 * testing, and that removes any differences). However as we
1141 * know that csum_partial always returned a 16bit value on
1142 * alphas, do a fold to maximise conformity to previous behaviour.
1144 sb
->sb_csum
= md_csum_fold(disk_csum
);
1146 sb
->sb_csum
= disk_csum
;
1152 * Handle superblock details.
1153 * We want to be able to handle multiple superblock formats
1154 * so we have a common interface to them all, and an array of
1155 * different handlers.
1156 * We rely on user-space to write the initial superblock, and support
1157 * reading and updating of superblocks.
1158 * Interface methods are:
1159 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version)
1160 * loads and validates a superblock on dev.
1161 * if refdev != NULL, compare superblocks on both devices
1163 * 0 - dev has a superblock that is compatible with refdev
1164 * 1 - dev has a superblock that is compatible and newer than refdev
1165 * so dev should be used as the refdev in future
1166 * -EINVAL superblock incompatible or invalid
1167 * -othererror e.g. -EIO
1169 * int validate_super(struct mddev *mddev, struct md_rdev *dev)
1170 * Verify that dev is acceptable into mddev.
1171 * The first time, mddev->raid_disks will be 0, and data from
1172 * dev should be merged in. Subsequent calls check that dev
1173 * is new enough. Return 0 or -EINVAL
1175 * void sync_super(struct mddev *mddev, struct md_rdev *dev)
1176 * Update the superblock for rdev with data in mddev
1177 * This does not write to disc.
1183 struct module
*owner
;
1184 int (*load_super
)(struct md_rdev
*rdev
,
1185 struct md_rdev
*refdev
,
1187 int (*validate_super
)(struct mddev
*mddev
,
1188 struct md_rdev
*rdev
);
1189 void (*sync_super
)(struct mddev
*mddev
,
1190 struct md_rdev
*rdev
);
1191 unsigned long long (*rdev_size_change
)(struct md_rdev
*rdev
,
1192 sector_t num_sectors
);
1193 int (*allow_new_offset
)(struct md_rdev
*rdev
,
1194 unsigned long long new_offset
);
1198 * Check that the given mddev has no bitmap.
1200 * This function is called from the run method of all personalities that do not
1201 * support bitmaps. It prints an error message and returns non-zero if mddev
1202 * has a bitmap. Otherwise, it returns 0.
1205 int md_check_no_bitmap(struct mddev
*mddev
)
1207 if (!mddev
->bitmap_info
.file
&& !mddev
->bitmap_info
.offset
)
1209 pr_warn("%s: bitmaps are not supported for %s\n",
1210 mdname(mddev
), mddev
->pers
->name
);
1213 EXPORT_SYMBOL(md_check_no_bitmap
);
1216 * load_super for 0.90.0
1218 static int super_90_load(struct md_rdev
*rdev
, struct md_rdev
*refdev
, int minor_version
)
1220 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1223 bool spare_disk
= true;
1226 * Calculate the position of the superblock (512byte sectors),
1227 * it's at the end of the disk.
1229 * It also happens to be a multiple of 4Kb.
1231 rdev
->sb_start
= calc_dev_sboffset(rdev
);
1233 ret
= read_disk_sb(rdev
, MD_SB_BYTES
);
1239 bdevname(rdev
->bdev
, b
);
1240 sb
= page_address(rdev
->sb_page
);
1242 if (sb
->md_magic
!= MD_SB_MAGIC
) {
1243 pr_warn("md: invalid raid superblock magic on %s\n", b
);
1247 if (sb
->major_version
!= 0 ||
1248 sb
->minor_version
< 90 ||
1249 sb
->minor_version
> 91) {
1250 pr_warn("Bad version number %d.%d on %s\n",
1251 sb
->major_version
, sb
->minor_version
, b
);
1255 if (sb
->raid_disks
<= 0)
1258 if (md_csum_fold(calc_sb_csum(sb
)) != md_csum_fold(sb
->sb_csum
)) {
1259 pr_warn("md: invalid superblock checksum on %s\n", b
);
1263 rdev
->preferred_minor
= sb
->md_minor
;
1264 rdev
->data_offset
= 0;
1265 rdev
->new_data_offset
= 0;
1266 rdev
->sb_size
= MD_SB_BYTES
;
1267 rdev
->badblocks
.shift
= -1;
1269 if (sb
->level
== LEVEL_MULTIPATH
)
1272 rdev
->desc_nr
= sb
->this_disk
.number
;
1274 /* not spare disk, or LEVEL_MULTIPATH */
1275 if (sb
->level
== LEVEL_MULTIPATH
||
1276 (rdev
->desc_nr
>= 0 &&
1277 rdev
->desc_nr
< MD_SB_DISKS
&&
1278 sb
->disks
[rdev
->desc_nr
].state
&
1279 ((1<<MD_DISK_SYNC
) | (1 << MD_DISK_ACTIVE
))))
1289 mdp_super_t
*refsb
= page_address(refdev
->sb_page
);
1290 if (!md_uuid_equal(refsb
, sb
)) {
1291 pr_warn("md: %s has different UUID to %s\n",
1292 b
, bdevname(refdev
->bdev
,b2
));
1295 if (!md_sb_equal(refsb
, sb
)) {
1296 pr_warn("md: %s has same UUID but different superblock to %s\n",
1297 b
, bdevname(refdev
->bdev
, b2
));
1301 ev2
= md_event(refsb
);
1303 if (!spare_disk
&& ev1
> ev2
)
1308 rdev
->sectors
= rdev
->sb_start
;
1309 /* Limit to 4TB as metadata cannot record more than that.
1310 * (not needed for Linear and RAID0 as metadata doesn't
1313 if ((u64
)rdev
->sectors
>= (2ULL << 32) && sb
->level
>= 1)
1314 rdev
->sectors
= (sector_t
)(2ULL << 32) - 2;
1316 if (rdev
->sectors
< ((sector_t
)sb
->size
) * 2 && sb
->level
>= 1)
1317 /* "this cannot possibly happen" ... */
1325 * validate_super for 0.90.0
1327 static int super_90_validate(struct mddev
*mddev
, struct md_rdev
*rdev
)
1330 mdp_super_t
*sb
= page_address(rdev
->sb_page
);
1331 __u64 ev1
= md_event(sb
);
1333 rdev
->raid_disk
= -1;
1334 clear_bit(Faulty
, &rdev
->flags
);
1335 clear_bit(In_sync
, &rdev
->flags
);
1336 clear_bit(Bitmap_sync
, &rdev
->flags
);
1337 clear_bit(WriteMostly
, &rdev
->flags
);
1339 if (mddev
->raid_disks
== 0) {
1340 mddev
->major_version
= 0;
1341 mddev
->minor_version
= sb
->minor_version
;
1342 mddev
->patch_version
= sb
->patch_version
;
1343 mddev
->external
= 0;
1344 mddev
->chunk_sectors
= sb
->chunk_size
>> 9;
1345 mddev
->ctime
= sb
->ctime
;
1346 mddev
->utime
= sb
->utime
;
1347 mddev
->level
= sb
->level
;
1348 mddev
->clevel
[0] = 0;
1349 mddev
->layout
= sb
->layout
;
1350 mddev
->raid_disks
= sb
->raid_disks
;
1351 mddev
->dev_sectors
= ((sector_t
)sb
->size
) * 2;
1352 mddev
->events
= ev1
;
1353 mddev
->bitmap_info
.offset
= 0;
1354 mddev
->bitmap_info
.space
= 0;
1355 /* bitmap can use 60 K after the 4K superblocks */
1356 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
1357 mddev
->bitmap_info
.default_space
= 64*2 - (MD_SB_BYTES
>> 9);
1358 mddev
->reshape_backwards
= 0;
1360 if (mddev
->minor_version
>= 91) {
1361 mddev
->reshape_position
= sb
->reshape_position
;
1362 mddev
->delta_disks
= sb
->delta_disks
;
1363 mddev
->new_level
= sb
->new_level
;
1364 mddev
->new_layout
= sb
->new_layout
;
1365 mddev
->new_chunk_sectors
= sb
->new_chunk
>> 9;
1366 if (mddev
->delta_disks
< 0)
1367 mddev
->reshape_backwards
= 1;
1369 mddev
->reshape_position
= MaxSector
;
1370 mddev
->delta_disks
= 0;
1371 mddev
->new_level
= mddev
->level
;
1372 mddev
->new_layout
= mddev
->layout
;
1373 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1375 if (mddev
->level
== 0)
1378 if (sb
->state
& (1<<MD_SB_CLEAN
))
1379 mddev
->recovery_cp
= MaxSector
;
1381 if (sb
->events_hi
== sb
->cp_events_hi
&&
1382 sb
->events_lo
== sb
->cp_events_lo
) {
1383 mddev
->recovery_cp
= sb
->recovery_cp
;
1385 mddev
->recovery_cp
= 0;
1388 memcpy(mddev
->uuid
+0, &sb
->set_uuid0
, 4);
1389 memcpy(mddev
->uuid
+4, &sb
->set_uuid1
, 4);
1390 memcpy(mddev
->uuid
+8, &sb
->set_uuid2
, 4);
1391 memcpy(mddev
->uuid
+12,&sb
->set_uuid3
, 4);
1393 mddev
->max_disks
= MD_SB_DISKS
;
1395 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
) &&
1396 mddev
->bitmap_info
.file
== NULL
) {
1397 mddev
->bitmap_info
.offset
=
1398 mddev
->bitmap_info
.default_offset
;
1399 mddev
->bitmap_info
.space
=
1400 mddev
->bitmap_info
.default_space
;
1403 } else if (mddev
->pers
== NULL
) {
1404 /* Insist on good event counter while assembling, except
1405 * for spares (which don't need an event count) */
1407 if (sb
->disks
[rdev
->desc_nr
].state
& (
1408 (1<<MD_DISK_SYNC
) | (1 << MD_DISK_ACTIVE
)))
1409 if (ev1
< mddev
->events
)
1411 } else if (mddev
->bitmap
) {
1412 /* if adding to array with a bitmap, then we can accept an
1413 * older device ... but not too old.
1415 if (ev1
< mddev
->bitmap
->events_cleared
)
1417 if (ev1
< mddev
->events
)
1418 set_bit(Bitmap_sync
, &rdev
->flags
);
1420 if (ev1
< mddev
->events
)
1421 /* just a hot-add of a new device, leave raid_disk at -1 */
1425 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1426 desc
= sb
->disks
+ rdev
->desc_nr
;
1428 if (desc
->state
& (1<<MD_DISK_FAULTY
))
1429 set_bit(Faulty
, &rdev
->flags
);
1430 else if (desc
->state
& (1<<MD_DISK_SYNC
) /* &&
1431 desc->raid_disk < mddev->raid_disks */) {
1432 set_bit(In_sync
, &rdev
->flags
);
1433 rdev
->raid_disk
= desc
->raid_disk
;
1434 rdev
->saved_raid_disk
= desc
->raid_disk
;
1435 } else if (desc
->state
& (1<<MD_DISK_ACTIVE
)) {
1436 /* active but not in sync implies recovery up to
1437 * reshape position. We don't know exactly where
1438 * that is, so set to zero for now */
1439 if (mddev
->minor_version
>= 91) {
1440 rdev
->recovery_offset
= 0;
1441 rdev
->raid_disk
= desc
->raid_disk
;
1444 if (desc
->state
& (1<<MD_DISK_WRITEMOSTLY
))
1445 set_bit(WriteMostly
, &rdev
->flags
);
1446 if (desc
->state
& (1<<MD_DISK_FAILFAST
))
1447 set_bit(FailFast
, &rdev
->flags
);
1448 } else /* MULTIPATH are always insync */
1449 set_bit(In_sync
, &rdev
->flags
);
1454 * sync_super for 0.90.0
1456 static void super_90_sync(struct mddev
*mddev
, struct md_rdev
*rdev
)
1459 struct md_rdev
*rdev2
;
1460 int next_spare
= mddev
->raid_disks
;
1462 /* make rdev->sb match mddev data..
1465 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1466 * 3/ any empty disks < next_spare become removed
1468 * disks[0] gets initialised to REMOVED because
1469 * we cannot be sure from other fields if it has
1470 * been initialised or not.
1473 int active
=0, working
=0,failed
=0,spare
=0,nr_disks
=0;
1475 rdev
->sb_size
= MD_SB_BYTES
;
1477 sb
= page_address(rdev
->sb_page
);
1479 memset(sb
, 0, sizeof(*sb
));
1481 sb
->md_magic
= MD_SB_MAGIC
;
1482 sb
->major_version
= mddev
->major_version
;
1483 sb
->patch_version
= mddev
->patch_version
;
1484 sb
->gvalid_words
= 0; /* ignored */
1485 memcpy(&sb
->set_uuid0
, mddev
->uuid
+0, 4);
1486 memcpy(&sb
->set_uuid1
, mddev
->uuid
+4, 4);
1487 memcpy(&sb
->set_uuid2
, mddev
->uuid
+8, 4);
1488 memcpy(&sb
->set_uuid3
, mddev
->uuid
+12,4);
1490 sb
->ctime
= clamp_t(time64_t
, mddev
->ctime
, 0, U32_MAX
);
1491 sb
->level
= mddev
->level
;
1492 sb
->size
= mddev
->dev_sectors
/ 2;
1493 sb
->raid_disks
= mddev
->raid_disks
;
1494 sb
->md_minor
= mddev
->md_minor
;
1495 sb
->not_persistent
= 0;
1496 sb
->utime
= clamp_t(time64_t
, mddev
->utime
, 0, U32_MAX
);
1498 sb
->events_hi
= (mddev
->events
>>32);
1499 sb
->events_lo
= (u32
)mddev
->events
;
1501 if (mddev
->reshape_position
== MaxSector
)
1502 sb
->minor_version
= 90;
1504 sb
->minor_version
= 91;
1505 sb
->reshape_position
= mddev
->reshape_position
;
1506 sb
->new_level
= mddev
->new_level
;
1507 sb
->delta_disks
= mddev
->delta_disks
;
1508 sb
->new_layout
= mddev
->new_layout
;
1509 sb
->new_chunk
= mddev
->new_chunk_sectors
<< 9;
1511 mddev
->minor_version
= sb
->minor_version
;
1514 sb
->recovery_cp
= mddev
->recovery_cp
;
1515 sb
->cp_events_hi
= (mddev
->events
>>32);
1516 sb
->cp_events_lo
= (u32
)mddev
->events
;
1517 if (mddev
->recovery_cp
== MaxSector
)
1518 sb
->state
= (1<< MD_SB_CLEAN
);
1520 sb
->recovery_cp
= 0;
1522 sb
->layout
= mddev
->layout
;
1523 sb
->chunk_size
= mddev
->chunk_sectors
<< 9;
1525 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
)
1526 sb
->state
|= (1<<MD_SB_BITMAP_PRESENT
);
1528 sb
->disks
[0].state
= (1<<MD_DISK_REMOVED
);
1529 rdev_for_each(rdev2
, mddev
) {
1532 int is_active
= test_bit(In_sync
, &rdev2
->flags
);
1534 if (rdev2
->raid_disk
>= 0 &&
1535 sb
->minor_version
>= 91)
1536 /* we have nowhere to store the recovery_offset,
1537 * but if it is not below the reshape_position,
1538 * we can piggy-back on that.
1541 if (rdev2
->raid_disk
< 0 ||
1542 test_bit(Faulty
, &rdev2
->flags
))
1545 desc_nr
= rdev2
->raid_disk
;
1547 desc_nr
= next_spare
++;
1548 rdev2
->desc_nr
= desc_nr
;
1549 d
= &sb
->disks
[rdev2
->desc_nr
];
1551 d
->number
= rdev2
->desc_nr
;
1552 d
->major
= MAJOR(rdev2
->bdev
->bd_dev
);
1553 d
->minor
= MINOR(rdev2
->bdev
->bd_dev
);
1555 d
->raid_disk
= rdev2
->raid_disk
;
1557 d
->raid_disk
= rdev2
->desc_nr
; /* compatibility */
1558 if (test_bit(Faulty
, &rdev2
->flags
))
1559 d
->state
= (1<<MD_DISK_FAULTY
);
1560 else if (is_active
) {
1561 d
->state
= (1<<MD_DISK_ACTIVE
);
1562 if (test_bit(In_sync
, &rdev2
->flags
))
1563 d
->state
|= (1<<MD_DISK_SYNC
);
1571 if (test_bit(WriteMostly
, &rdev2
->flags
))
1572 d
->state
|= (1<<MD_DISK_WRITEMOSTLY
);
1573 if (test_bit(FailFast
, &rdev2
->flags
))
1574 d
->state
|= (1<<MD_DISK_FAILFAST
);
1576 /* now set the "removed" and "faulty" bits on any missing devices */
1577 for (i
=0 ; i
< mddev
->raid_disks
; i
++) {
1578 mdp_disk_t
*d
= &sb
->disks
[i
];
1579 if (d
->state
== 0 && d
->number
== 0) {
1582 d
->state
= (1<<MD_DISK_REMOVED
);
1583 d
->state
|= (1<<MD_DISK_FAULTY
);
1587 sb
->nr_disks
= nr_disks
;
1588 sb
->active_disks
= active
;
1589 sb
->working_disks
= working
;
1590 sb
->failed_disks
= failed
;
1591 sb
->spare_disks
= spare
;
1593 sb
->this_disk
= sb
->disks
[rdev
->desc_nr
];
1594 sb
->sb_csum
= calc_sb_csum(sb
);
1598 * rdev_size_change for 0.90.0
1600 static unsigned long long
1601 super_90_rdev_size_change(struct md_rdev
*rdev
, sector_t num_sectors
)
1603 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1604 return 0; /* component must fit device */
1605 if (rdev
->mddev
->bitmap_info
.offset
)
1606 return 0; /* can't move bitmap */
1607 rdev
->sb_start
= calc_dev_sboffset(rdev
);
1608 if (!num_sectors
|| num_sectors
> rdev
->sb_start
)
1609 num_sectors
= rdev
->sb_start
;
1610 /* Limit to 4TB as metadata cannot record more than that.
1611 * 4TB == 2^32 KB, or 2*2^32 sectors.
1613 if ((u64
)num_sectors
>= (2ULL << 32) && rdev
->mddev
->level
>= 1)
1614 num_sectors
= (sector_t
)(2ULL << 32) - 2;
1616 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1618 } while (md_super_wait(rdev
->mddev
) < 0);
1623 super_90_allow_new_offset(struct md_rdev
*rdev
, unsigned long long new_offset
)
1625 /* non-zero offset changes not possible with v0.90 */
1626 return new_offset
== 0;
1630 * version 1 superblock
1633 static __le32
calc_sb_1_csum(struct mdp_superblock_1
*sb
)
1637 unsigned long long newcsum
;
1638 int size
= 256 + le32_to_cpu(sb
->max_dev
)*2;
1639 __le32
*isuper
= (__le32
*)sb
;
1641 disk_csum
= sb
->sb_csum
;
1644 for (; size
>= 4; size
-= 4)
1645 newcsum
+= le32_to_cpu(*isuper
++);
1648 newcsum
+= le16_to_cpu(*(__le16
*) isuper
);
1650 csum
= (newcsum
& 0xffffffff) + (newcsum
>> 32);
1651 sb
->sb_csum
= disk_csum
;
1652 return cpu_to_le32(csum
);
1655 static int super_1_load(struct md_rdev
*rdev
, struct md_rdev
*refdev
, int minor_version
)
1657 struct mdp_superblock_1
*sb
;
1661 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1663 bool spare_disk
= true;
1666 * Calculate the position of the superblock in 512byte sectors.
1667 * It is always aligned to a 4K boundary and
1668 * depeding on minor_version, it can be:
1669 * 0: At least 8K, but less than 12K, from end of device
1670 * 1: At start of device
1671 * 2: 4K from start of device.
1673 switch(minor_version
) {
1675 sb_start
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1677 sb_start
&= ~(sector_t
)(4*2-1);
1688 rdev
->sb_start
= sb_start
;
1690 /* superblock is rarely larger than 1K, but it can be larger,
1691 * and it is safe to read 4k, so we do that
1693 ret
= read_disk_sb(rdev
, 4096);
1694 if (ret
) return ret
;
1696 sb
= page_address(rdev
->sb_page
);
1698 if (sb
->magic
!= cpu_to_le32(MD_SB_MAGIC
) ||
1699 sb
->major_version
!= cpu_to_le32(1) ||
1700 le32_to_cpu(sb
->max_dev
) > (4096-256)/2 ||
1701 le64_to_cpu(sb
->super_offset
) != rdev
->sb_start
||
1702 (le32_to_cpu(sb
->feature_map
) & ~MD_FEATURE_ALL
) != 0)
1705 if (calc_sb_1_csum(sb
) != sb
->sb_csum
) {
1706 pr_warn("md: invalid superblock checksum on %s\n",
1707 bdevname(rdev
->bdev
,b
));
1710 if (le64_to_cpu(sb
->data_size
) < 10) {
1711 pr_warn("md: data_size too small on %s\n",
1712 bdevname(rdev
->bdev
,b
));
1717 memcmp(sb
->pad3
, sb
->pad3
+1, sizeof(sb
->pad3
) - sizeof(sb
->pad3
[1])))
1718 /* Some padding is non-zero, might be a new feature */
1721 rdev
->preferred_minor
= 0xffff;
1722 rdev
->data_offset
= le64_to_cpu(sb
->data_offset
);
1723 rdev
->new_data_offset
= rdev
->data_offset
;
1724 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
) &&
1725 (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_NEW_OFFSET
))
1726 rdev
->new_data_offset
+= (s32
)le32_to_cpu(sb
->new_offset
);
1727 atomic_set(&rdev
->corrected_errors
, le32_to_cpu(sb
->cnt_corrected_read
));
1729 rdev
->sb_size
= le32_to_cpu(sb
->max_dev
) * 2 + 256;
1730 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1731 if (rdev
->sb_size
& bmask
)
1732 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1735 && rdev
->data_offset
< sb_start
+ (rdev
->sb_size
/512))
1738 && rdev
->new_data_offset
< sb_start
+ (rdev
->sb_size
/512))
1741 if (sb
->level
== cpu_to_le32(LEVEL_MULTIPATH
))
1744 rdev
->desc_nr
= le32_to_cpu(sb
->dev_number
);
1746 if (!rdev
->bb_page
) {
1747 rdev
->bb_page
= alloc_page(GFP_KERNEL
);
1751 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BAD_BLOCKS
) &&
1752 rdev
->badblocks
.count
== 0) {
1753 /* need to load the bad block list.
1754 * Currently we limit it to one page.
1760 int sectors
= le16_to_cpu(sb
->bblog_size
);
1761 if (sectors
> (PAGE_SIZE
/ 512))
1763 offset
= le32_to_cpu(sb
->bblog_offset
);
1766 bb_sector
= (long long)offset
;
1767 if (!sync_page_io(rdev
, bb_sector
, sectors
<< 9,
1768 rdev
->bb_page
, REQ_OP_READ
, 0, true))
1770 bbp
= (__le64
*)page_address(rdev
->bb_page
);
1771 rdev
->badblocks
.shift
= sb
->bblog_shift
;
1772 for (i
= 0 ; i
< (sectors
<< (9-3)) ; i
++, bbp
++) {
1773 u64 bb
= le64_to_cpu(*bbp
);
1774 int count
= bb
& (0x3ff);
1775 u64 sector
= bb
>> 10;
1776 sector
<<= sb
->bblog_shift
;
1777 count
<<= sb
->bblog_shift
;
1780 if (badblocks_set(&rdev
->badblocks
, sector
, count
, 1))
1783 } else if (sb
->bblog_offset
!= 0)
1784 rdev
->badblocks
.shift
= 0;
1786 if ((le32_to_cpu(sb
->feature_map
) &
1787 (MD_FEATURE_PPL
| MD_FEATURE_MULTIPLE_PPLS
))) {
1788 rdev
->ppl
.offset
= (__s16
)le16_to_cpu(sb
->ppl
.offset
);
1789 rdev
->ppl
.size
= le16_to_cpu(sb
->ppl
.size
);
1790 rdev
->ppl
.sector
= rdev
->sb_start
+ rdev
->ppl
.offset
;
1793 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RAID0_LAYOUT
) &&
1797 /* not spare disk, or LEVEL_MULTIPATH */
1798 if (sb
->level
== cpu_to_le32(LEVEL_MULTIPATH
) ||
1799 (rdev
->desc_nr
>= 0 &&
1800 rdev
->desc_nr
< le32_to_cpu(sb
->max_dev
) &&
1801 (le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]) < MD_DISK_ROLE_MAX
||
1802 le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]) == MD_DISK_ROLE_JOURNAL
)))
1812 struct mdp_superblock_1
*refsb
= page_address(refdev
->sb_page
);
1814 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16) != 0 ||
1815 sb
->level
!= refsb
->level
||
1816 sb
->layout
!= refsb
->layout
||
1817 sb
->chunksize
!= refsb
->chunksize
) {
1818 pr_warn("md: %s has strangely different superblock to %s\n",
1819 bdevname(rdev
->bdev
,b
),
1820 bdevname(refdev
->bdev
,b2
));
1823 ev1
= le64_to_cpu(sb
->events
);
1824 ev2
= le64_to_cpu(refsb
->events
);
1826 if (!spare_disk
&& ev1
> ev2
)
1831 if (minor_version
) {
1832 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9);
1833 sectors
-= rdev
->data_offset
;
1835 sectors
= rdev
->sb_start
;
1836 if (sectors
< le64_to_cpu(sb
->data_size
))
1838 rdev
->sectors
= le64_to_cpu(sb
->data_size
);
1842 static int super_1_validate(struct mddev
*mddev
, struct md_rdev
*rdev
)
1844 struct mdp_superblock_1
*sb
= page_address(rdev
->sb_page
);
1845 __u64 ev1
= le64_to_cpu(sb
->events
);
1847 rdev
->raid_disk
= -1;
1848 clear_bit(Faulty
, &rdev
->flags
);
1849 clear_bit(In_sync
, &rdev
->flags
);
1850 clear_bit(Bitmap_sync
, &rdev
->flags
);
1851 clear_bit(WriteMostly
, &rdev
->flags
);
1853 if (mddev
->raid_disks
== 0) {
1854 mddev
->major_version
= 1;
1855 mddev
->patch_version
= 0;
1856 mddev
->external
= 0;
1857 mddev
->chunk_sectors
= le32_to_cpu(sb
->chunksize
);
1858 mddev
->ctime
= le64_to_cpu(sb
->ctime
);
1859 mddev
->utime
= le64_to_cpu(sb
->utime
);
1860 mddev
->level
= le32_to_cpu(sb
->level
);
1861 mddev
->clevel
[0] = 0;
1862 mddev
->layout
= le32_to_cpu(sb
->layout
);
1863 mddev
->raid_disks
= le32_to_cpu(sb
->raid_disks
);
1864 mddev
->dev_sectors
= le64_to_cpu(sb
->size
);
1865 mddev
->events
= ev1
;
1866 mddev
->bitmap_info
.offset
= 0;
1867 mddev
->bitmap_info
.space
= 0;
1868 /* Default location for bitmap is 1K after superblock
1869 * using 3K - total of 4K
1871 mddev
->bitmap_info
.default_offset
= 1024 >> 9;
1872 mddev
->bitmap_info
.default_space
= (4096-1024) >> 9;
1873 mddev
->reshape_backwards
= 0;
1875 mddev
->recovery_cp
= le64_to_cpu(sb
->resync_offset
);
1876 memcpy(mddev
->uuid
, sb
->set_uuid
, 16);
1878 mddev
->max_disks
= (4096-256)/2;
1880 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
) &&
1881 mddev
->bitmap_info
.file
== NULL
) {
1882 mddev
->bitmap_info
.offset
=
1883 (__s32
)le32_to_cpu(sb
->bitmap_offset
);
1884 /* Metadata doesn't record how much space is available.
1885 * For 1.0, we assume we can use up to the superblock
1886 * if before, else to 4K beyond superblock.
1887 * For others, assume no change is possible.
1889 if (mddev
->minor_version
> 0)
1890 mddev
->bitmap_info
.space
= 0;
1891 else if (mddev
->bitmap_info
.offset
> 0)
1892 mddev
->bitmap_info
.space
=
1893 8 - mddev
->bitmap_info
.offset
;
1895 mddev
->bitmap_info
.space
=
1896 -mddev
->bitmap_info
.offset
;
1899 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
1900 mddev
->reshape_position
= le64_to_cpu(sb
->reshape_position
);
1901 mddev
->delta_disks
= le32_to_cpu(sb
->delta_disks
);
1902 mddev
->new_level
= le32_to_cpu(sb
->new_level
);
1903 mddev
->new_layout
= le32_to_cpu(sb
->new_layout
);
1904 mddev
->new_chunk_sectors
= le32_to_cpu(sb
->new_chunk
);
1905 if (mddev
->delta_disks
< 0 ||
1906 (mddev
->delta_disks
== 0 &&
1907 (le32_to_cpu(sb
->feature_map
)
1908 & MD_FEATURE_RESHAPE_BACKWARDS
)))
1909 mddev
->reshape_backwards
= 1;
1911 mddev
->reshape_position
= MaxSector
;
1912 mddev
->delta_disks
= 0;
1913 mddev
->new_level
= mddev
->level
;
1914 mddev
->new_layout
= mddev
->layout
;
1915 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1918 if (mddev
->level
== 0 &&
1919 !(le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RAID0_LAYOUT
))
1922 if (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_JOURNAL
)
1923 set_bit(MD_HAS_JOURNAL
, &mddev
->flags
);
1925 if (le32_to_cpu(sb
->feature_map
) &
1926 (MD_FEATURE_PPL
| MD_FEATURE_MULTIPLE_PPLS
)) {
1927 if (le32_to_cpu(sb
->feature_map
) &
1928 (MD_FEATURE_BITMAP_OFFSET
| MD_FEATURE_JOURNAL
))
1930 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_PPL
) &&
1931 (le32_to_cpu(sb
->feature_map
) &
1932 MD_FEATURE_MULTIPLE_PPLS
))
1934 set_bit(MD_HAS_PPL
, &mddev
->flags
);
1936 } else if (mddev
->pers
== NULL
) {
1937 /* Insist of good event counter while assembling, except for
1938 * spares (which don't need an event count) */
1940 if (rdev
->desc_nr
>= 0 &&
1941 rdev
->desc_nr
< le32_to_cpu(sb
->max_dev
) &&
1942 (le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]) < MD_DISK_ROLE_MAX
||
1943 le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]) == MD_DISK_ROLE_JOURNAL
))
1944 if (ev1
< mddev
->events
)
1946 } else if (mddev
->bitmap
) {
1947 /* If adding to array with a bitmap, then we can accept an
1948 * older device, but not too old.
1950 if (ev1
< mddev
->bitmap
->events_cleared
)
1952 if (ev1
< mddev
->events
)
1953 set_bit(Bitmap_sync
, &rdev
->flags
);
1955 if (ev1
< mddev
->events
)
1956 /* just a hot-add of a new device, leave raid_disk at -1 */
1959 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1961 if (rdev
->desc_nr
< 0 ||
1962 rdev
->desc_nr
>= le32_to_cpu(sb
->max_dev
)) {
1963 role
= MD_DISK_ROLE_SPARE
;
1966 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
1968 case MD_DISK_ROLE_SPARE
: /* spare */
1970 case MD_DISK_ROLE_FAULTY
: /* faulty */
1971 set_bit(Faulty
, &rdev
->flags
);
1973 case MD_DISK_ROLE_JOURNAL
: /* journal device */
1974 if (!(le32_to_cpu(sb
->feature_map
) & MD_FEATURE_JOURNAL
)) {
1975 /* journal device without journal feature */
1976 pr_warn("md: journal device provided without journal feature, ignoring the device\n");
1979 set_bit(Journal
, &rdev
->flags
);
1980 rdev
->journal_tail
= le64_to_cpu(sb
->journal_tail
);
1981 rdev
->raid_disk
= 0;
1984 rdev
->saved_raid_disk
= role
;
1985 if ((le32_to_cpu(sb
->feature_map
) &
1986 MD_FEATURE_RECOVERY_OFFSET
)) {
1987 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
1988 if (!(le32_to_cpu(sb
->feature_map
) &
1989 MD_FEATURE_RECOVERY_BITMAP
))
1990 rdev
->saved_raid_disk
= -1;
1993 * If the array is FROZEN, then the device can't
1994 * be in_sync with rest of array.
1996 if (!test_bit(MD_RECOVERY_FROZEN
,
1998 set_bit(In_sync
, &rdev
->flags
);
2000 rdev
->raid_disk
= role
;
2003 if (sb
->devflags
& WriteMostly1
)
2004 set_bit(WriteMostly
, &rdev
->flags
);
2005 if (sb
->devflags
& FailFast1
)
2006 set_bit(FailFast
, &rdev
->flags
);
2007 if (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_REPLACEMENT
)
2008 set_bit(Replacement
, &rdev
->flags
);
2009 } else /* MULTIPATH are always insync */
2010 set_bit(In_sync
, &rdev
->flags
);
2015 static void super_1_sync(struct mddev
*mddev
, struct md_rdev
*rdev
)
2017 struct mdp_superblock_1
*sb
;
2018 struct md_rdev
*rdev2
;
2020 /* make rdev->sb match mddev and rdev data. */
2022 sb
= page_address(rdev
->sb_page
);
2024 sb
->feature_map
= 0;
2026 sb
->recovery_offset
= cpu_to_le64(0);
2027 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
2029 sb
->utime
= cpu_to_le64((__u64
)mddev
->utime
);
2030 sb
->events
= cpu_to_le64(mddev
->events
);
2032 sb
->resync_offset
= cpu_to_le64(mddev
->recovery_cp
);
2033 else if (test_bit(MD_JOURNAL_CLEAN
, &mddev
->flags
))
2034 sb
->resync_offset
= cpu_to_le64(MaxSector
);
2036 sb
->resync_offset
= cpu_to_le64(0);
2038 sb
->cnt_corrected_read
= cpu_to_le32(atomic_read(&rdev
->corrected_errors
));
2040 sb
->raid_disks
= cpu_to_le32(mddev
->raid_disks
);
2041 sb
->size
= cpu_to_le64(mddev
->dev_sectors
);
2042 sb
->chunksize
= cpu_to_le32(mddev
->chunk_sectors
);
2043 sb
->level
= cpu_to_le32(mddev
->level
);
2044 sb
->layout
= cpu_to_le32(mddev
->layout
);
2045 if (test_bit(FailFast
, &rdev
->flags
))
2046 sb
->devflags
|= FailFast1
;
2048 sb
->devflags
&= ~FailFast1
;
2050 if (test_bit(WriteMostly
, &rdev
->flags
))
2051 sb
->devflags
|= WriteMostly1
;
2053 sb
->devflags
&= ~WriteMostly1
;
2054 sb
->data_offset
= cpu_to_le64(rdev
->data_offset
);
2055 sb
->data_size
= cpu_to_le64(rdev
->sectors
);
2057 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
) {
2058 sb
->bitmap_offset
= cpu_to_le32((__u32
)mddev
->bitmap_info
.offset
);
2059 sb
->feature_map
= cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
);
2062 if (rdev
->raid_disk
>= 0 && !test_bit(Journal
, &rdev
->flags
) &&
2063 !test_bit(In_sync
, &rdev
->flags
)) {
2065 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET
);
2066 sb
->recovery_offset
=
2067 cpu_to_le64(rdev
->recovery_offset
);
2068 if (rdev
->saved_raid_disk
>= 0 && mddev
->bitmap
)
2070 cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP
);
2072 /* Note: recovery_offset and journal_tail share space */
2073 if (test_bit(Journal
, &rdev
->flags
))
2074 sb
->journal_tail
= cpu_to_le64(rdev
->journal_tail
);
2075 if (test_bit(Replacement
, &rdev
->flags
))
2077 cpu_to_le32(MD_FEATURE_REPLACEMENT
);
2079 if (mddev
->reshape_position
!= MaxSector
) {
2080 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE
);
2081 sb
->reshape_position
= cpu_to_le64(mddev
->reshape_position
);
2082 sb
->new_layout
= cpu_to_le32(mddev
->new_layout
);
2083 sb
->delta_disks
= cpu_to_le32(mddev
->delta_disks
);
2084 sb
->new_level
= cpu_to_le32(mddev
->new_level
);
2085 sb
->new_chunk
= cpu_to_le32(mddev
->new_chunk_sectors
);
2086 if (mddev
->delta_disks
== 0 &&
2087 mddev
->reshape_backwards
)
2089 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS
);
2090 if (rdev
->new_data_offset
!= rdev
->data_offset
) {
2092 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET
);
2093 sb
->new_offset
= cpu_to_le32((__u32
)(rdev
->new_data_offset
2094 - rdev
->data_offset
));
2098 if (mddev_is_clustered(mddev
))
2099 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_CLUSTERED
);
2101 if (rdev
->badblocks
.count
== 0)
2102 /* Nothing to do for bad blocks*/ ;
2103 else if (sb
->bblog_offset
== 0)
2104 /* Cannot record bad blocks on this device */
2105 md_error(mddev
, rdev
);
2107 struct badblocks
*bb
= &rdev
->badblocks
;
2108 __le64
*bbp
= (__le64
*)page_address(rdev
->bb_page
);
2110 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_BAD_BLOCKS
);
2115 seq
= read_seqbegin(&bb
->lock
);
2117 memset(bbp
, 0xff, PAGE_SIZE
);
2119 for (i
= 0 ; i
< bb
->count
; i
++) {
2120 u64 internal_bb
= p
[i
];
2121 u64 store_bb
= ((BB_OFFSET(internal_bb
) << 10)
2122 | BB_LEN(internal_bb
));
2123 bbp
[i
] = cpu_to_le64(store_bb
);
2126 if (read_seqretry(&bb
->lock
, seq
))
2129 bb
->sector
= (rdev
->sb_start
+
2130 (int)le32_to_cpu(sb
->bblog_offset
));
2131 bb
->size
= le16_to_cpu(sb
->bblog_size
);
2136 rdev_for_each(rdev2
, mddev
)
2137 if (rdev2
->desc_nr
+1 > max_dev
)
2138 max_dev
= rdev2
->desc_nr
+1;
2140 if (max_dev
> le32_to_cpu(sb
->max_dev
)) {
2142 sb
->max_dev
= cpu_to_le32(max_dev
);
2143 rdev
->sb_size
= max_dev
* 2 + 256;
2144 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
2145 if (rdev
->sb_size
& bmask
)
2146 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
2148 max_dev
= le32_to_cpu(sb
->max_dev
);
2150 for (i
=0; i
<max_dev
;i
++)
2151 sb
->dev_roles
[i
] = cpu_to_le16(MD_DISK_ROLE_SPARE
);
2153 if (test_bit(MD_HAS_JOURNAL
, &mddev
->flags
))
2154 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_JOURNAL
);
2156 if (test_bit(MD_HAS_PPL
, &mddev
->flags
)) {
2157 if (test_bit(MD_HAS_MULTIPLE_PPLS
, &mddev
->flags
))
2159 cpu_to_le32(MD_FEATURE_MULTIPLE_PPLS
);
2161 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_PPL
);
2162 sb
->ppl
.offset
= cpu_to_le16(rdev
->ppl
.offset
);
2163 sb
->ppl
.size
= cpu_to_le16(rdev
->ppl
.size
);
2166 rdev_for_each(rdev2
, mddev
) {
2168 if (test_bit(Faulty
, &rdev2
->flags
))
2169 sb
->dev_roles
[i
] = cpu_to_le16(MD_DISK_ROLE_FAULTY
);
2170 else if (test_bit(In_sync
, &rdev2
->flags
))
2171 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
2172 else if (test_bit(Journal
, &rdev2
->flags
))
2173 sb
->dev_roles
[i
] = cpu_to_le16(MD_DISK_ROLE_JOURNAL
);
2174 else if (rdev2
->raid_disk
>= 0)
2175 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
2177 sb
->dev_roles
[i
] = cpu_to_le16(MD_DISK_ROLE_SPARE
);
2180 sb
->sb_csum
= calc_sb_1_csum(sb
);
2183 static sector_t
super_1_choose_bm_space(sector_t dev_size
)
2187 /* if the device is bigger than 8Gig, save 64k for bitmap
2188 * usage, if bigger than 200Gig, save 128k
2190 if (dev_size
< 64*2)
2192 else if (dev_size
- 64*2 >= 200*1024*1024*2)
2194 else if (dev_size
- 4*2 > 8*1024*1024*2)
2201 static unsigned long long
2202 super_1_rdev_size_change(struct md_rdev
*rdev
, sector_t num_sectors
)
2204 struct mdp_superblock_1
*sb
;
2205 sector_t max_sectors
;
2206 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
2207 return 0; /* component must fit device */
2208 if (rdev
->data_offset
!= rdev
->new_data_offset
)
2209 return 0; /* too confusing */
2210 if (rdev
->sb_start
< rdev
->data_offset
) {
2211 /* minor versions 1 and 2; superblock before data */
2212 max_sectors
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
2213 max_sectors
-= rdev
->data_offset
;
2214 if (!num_sectors
|| num_sectors
> max_sectors
)
2215 num_sectors
= max_sectors
;
2216 } else if (rdev
->mddev
->bitmap_info
.offset
) {
2217 /* minor version 0 with bitmap we can't move */
2220 /* minor version 0; superblock after data */
2221 sector_t sb_start
, bm_space
;
2222 sector_t dev_size
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
2224 /* 8K is for superblock */
2225 sb_start
= dev_size
- 8*2;
2226 sb_start
&= ~(sector_t
)(4*2 - 1);
2228 bm_space
= super_1_choose_bm_space(dev_size
);
2230 /* Space that can be used to store date needs to decrease
2231 * superblock bitmap space and bad block space(4K)
2233 max_sectors
= sb_start
- bm_space
- 4*2;
2235 if (!num_sectors
|| num_sectors
> max_sectors
)
2236 num_sectors
= max_sectors
;
2238 sb
= page_address(rdev
->sb_page
);
2239 sb
->data_size
= cpu_to_le64(num_sectors
);
2240 sb
->super_offset
= cpu_to_le64(rdev
->sb_start
);
2241 sb
->sb_csum
= calc_sb_1_csum(sb
);
2243 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
2245 } while (md_super_wait(rdev
->mddev
) < 0);
2251 super_1_allow_new_offset(struct md_rdev
*rdev
,
2252 unsigned long long new_offset
)
2254 /* All necessary checks on new >= old have been done */
2255 struct bitmap
*bitmap
;
2256 if (new_offset
>= rdev
->data_offset
)
2259 /* with 1.0 metadata, there is no metadata to tread on
2260 * so we can always move back */
2261 if (rdev
->mddev
->minor_version
== 0)
2264 /* otherwise we must be sure not to step on
2265 * any metadata, so stay:
2266 * 36K beyond start of superblock
2267 * beyond end of badblocks
2268 * beyond write-intent bitmap
2270 if (rdev
->sb_start
+ (32+4)*2 > new_offset
)
2272 bitmap
= rdev
->mddev
->bitmap
;
2273 if (bitmap
&& !rdev
->mddev
->bitmap_info
.file
&&
2274 rdev
->sb_start
+ rdev
->mddev
->bitmap_info
.offset
+
2275 bitmap
->storage
.file_pages
* (PAGE_SIZE
>>9) > new_offset
)
2277 if (rdev
->badblocks
.sector
+ rdev
->badblocks
.size
> new_offset
)
2283 static struct super_type super_types
[] = {
2286 .owner
= THIS_MODULE
,
2287 .load_super
= super_90_load
,
2288 .validate_super
= super_90_validate
,
2289 .sync_super
= super_90_sync
,
2290 .rdev_size_change
= super_90_rdev_size_change
,
2291 .allow_new_offset
= super_90_allow_new_offset
,
2295 .owner
= THIS_MODULE
,
2296 .load_super
= super_1_load
,
2297 .validate_super
= super_1_validate
,
2298 .sync_super
= super_1_sync
,
2299 .rdev_size_change
= super_1_rdev_size_change
,
2300 .allow_new_offset
= super_1_allow_new_offset
,
2304 static void sync_super(struct mddev
*mddev
, struct md_rdev
*rdev
)
2306 if (mddev
->sync_super
) {
2307 mddev
->sync_super(mddev
, rdev
);
2311 BUG_ON(mddev
->major_version
>= ARRAY_SIZE(super_types
));
2313 super_types
[mddev
->major_version
].sync_super(mddev
, rdev
);
2316 static int match_mddev_units(struct mddev
*mddev1
, struct mddev
*mddev2
)
2318 struct md_rdev
*rdev
, *rdev2
;
2321 rdev_for_each_rcu(rdev
, mddev1
) {
2322 if (test_bit(Faulty
, &rdev
->flags
) ||
2323 test_bit(Journal
, &rdev
->flags
) ||
2324 rdev
->raid_disk
== -1)
2326 rdev_for_each_rcu(rdev2
, mddev2
) {
2327 if (test_bit(Faulty
, &rdev2
->flags
) ||
2328 test_bit(Journal
, &rdev2
->flags
) ||
2329 rdev2
->raid_disk
== -1)
2331 if (rdev
->bdev
->bd_disk
== rdev2
->bdev
->bd_disk
) {
2341 static LIST_HEAD(pending_raid_disks
);
2344 * Try to register data integrity profile for an mddev
2346 * This is called when an array is started and after a disk has been kicked
2347 * from the array. It only succeeds if all working and active component devices
2348 * are integrity capable with matching profiles.
2350 int md_integrity_register(struct mddev
*mddev
)
2352 struct md_rdev
*rdev
, *reference
= NULL
;
2354 if (list_empty(&mddev
->disks
))
2355 return 0; /* nothing to do */
2356 if (!mddev
->gendisk
|| blk_get_integrity(mddev
->gendisk
))
2357 return 0; /* shouldn't register, or already is */
2358 rdev_for_each(rdev
, mddev
) {
2359 /* skip spares and non-functional disks */
2360 if (test_bit(Faulty
, &rdev
->flags
))
2362 if (rdev
->raid_disk
< 0)
2365 /* Use the first rdev as the reference */
2369 /* does this rdev's profile match the reference profile? */
2370 if (blk_integrity_compare(reference
->bdev
->bd_disk
,
2371 rdev
->bdev
->bd_disk
) < 0)
2374 if (!reference
|| !bdev_get_integrity(reference
->bdev
))
2377 * All component devices are integrity capable and have matching
2378 * profiles, register the common profile for the md device.
2380 blk_integrity_register(mddev
->gendisk
,
2381 bdev_get_integrity(reference
->bdev
));
2383 pr_debug("md: data integrity enabled on %s\n", mdname(mddev
));
2384 if (bioset_integrity_create(&mddev
->bio_set
, BIO_POOL_SIZE
)) {
2385 pr_err("md: failed to create integrity pool for %s\n",
2391 EXPORT_SYMBOL(md_integrity_register
);
2394 * Attempt to add an rdev, but only if it is consistent with the current
2397 int md_integrity_add_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
2399 struct blk_integrity
*bi_mddev
;
2400 char name
[BDEVNAME_SIZE
];
2402 if (!mddev
->gendisk
)
2405 bi_mddev
= blk_get_integrity(mddev
->gendisk
);
2407 if (!bi_mddev
) /* nothing to do */
2410 if (blk_integrity_compare(mddev
->gendisk
, rdev
->bdev
->bd_disk
) != 0) {
2411 pr_err("%s: incompatible integrity profile for %s\n",
2412 mdname(mddev
), bdevname(rdev
->bdev
, name
));
2418 EXPORT_SYMBOL(md_integrity_add_rdev
);
2420 static int bind_rdev_to_array(struct md_rdev
*rdev
, struct mddev
*mddev
)
2422 char b
[BDEVNAME_SIZE
];
2425 /* prevent duplicates */
2426 if (find_rdev(mddev
, rdev
->bdev
->bd_dev
))
2429 if ((bdev_read_only(rdev
->bdev
) || bdev_read_only(rdev
->meta_bdev
)) &&
2433 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2434 if (!test_bit(Journal
, &rdev
->flags
) &&
2436 (mddev
->dev_sectors
== 0 || rdev
->sectors
< mddev
->dev_sectors
)) {
2438 /* Cannot change size, so fail
2439 * If mddev->level <= 0, then we don't care
2440 * about aligning sizes (e.g. linear)
2442 if (mddev
->level
> 0)
2445 mddev
->dev_sectors
= rdev
->sectors
;
2448 /* Verify rdev->desc_nr is unique.
2449 * If it is -1, assign a free number, else
2450 * check number is not in use
2453 if (rdev
->desc_nr
< 0) {
2456 choice
= mddev
->raid_disks
;
2457 while (md_find_rdev_nr_rcu(mddev
, choice
))
2459 rdev
->desc_nr
= choice
;
2461 if (md_find_rdev_nr_rcu(mddev
, rdev
->desc_nr
)) {
2467 if (!test_bit(Journal
, &rdev
->flags
) &&
2468 mddev
->max_disks
&& rdev
->desc_nr
>= mddev
->max_disks
) {
2469 pr_warn("md: %s: array is limited to %d devices\n",
2470 mdname(mddev
), mddev
->max_disks
);
2473 bdevname(rdev
->bdev
,b
);
2474 strreplace(b
, '/', '!');
2476 rdev
->mddev
= mddev
;
2477 pr_debug("md: bind<%s>\n", b
);
2479 if (mddev
->raid_disks
)
2480 mddev_create_serial_pool(mddev
, rdev
, false);
2482 if ((err
= kobject_add(&rdev
->kobj
, &mddev
->kobj
, "dev-%s", b
)))
2485 /* failure here is OK */
2486 err
= sysfs_create_link(&rdev
->kobj
, bdev_kobj(rdev
->bdev
), "block");
2487 rdev
->sysfs_state
= sysfs_get_dirent_safe(rdev
->kobj
.sd
, "state");
2488 rdev
->sysfs_unack_badblocks
=
2489 sysfs_get_dirent_safe(rdev
->kobj
.sd
, "unacknowledged_bad_blocks");
2490 rdev
->sysfs_badblocks
=
2491 sysfs_get_dirent_safe(rdev
->kobj
.sd
, "bad_blocks");
2493 list_add_rcu(&rdev
->same_set
, &mddev
->disks
);
2494 bd_link_disk_holder(rdev
->bdev
, mddev
->gendisk
);
2496 /* May as well allow recovery to be retried once */
2497 mddev
->recovery_disabled
++;
2502 pr_warn("md: failed to register dev-%s for %s\n",
2507 static void rdev_delayed_delete(struct work_struct
*ws
)
2509 struct md_rdev
*rdev
= container_of(ws
, struct md_rdev
, del_work
);
2510 kobject_del(&rdev
->kobj
);
2511 kobject_put(&rdev
->kobj
);
2514 static void unbind_rdev_from_array(struct md_rdev
*rdev
)
2516 char b
[BDEVNAME_SIZE
];
2518 bd_unlink_disk_holder(rdev
->bdev
, rdev
->mddev
->gendisk
);
2519 list_del_rcu(&rdev
->same_set
);
2520 pr_debug("md: unbind<%s>\n", bdevname(rdev
->bdev
,b
));
2521 mddev_destroy_serial_pool(rdev
->mddev
, rdev
, false);
2523 sysfs_remove_link(&rdev
->kobj
, "block");
2524 sysfs_put(rdev
->sysfs_state
);
2525 sysfs_put(rdev
->sysfs_unack_badblocks
);
2526 sysfs_put(rdev
->sysfs_badblocks
);
2527 rdev
->sysfs_state
= NULL
;
2528 rdev
->sysfs_unack_badblocks
= NULL
;
2529 rdev
->sysfs_badblocks
= NULL
;
2530 rdev
->badblocks
.count
= 0;
2531 /* We need to delay this, otherwise we can deadlock when
2532 * writing to 'remove' to "dev/state". We also need
2533 * to delay it due to rcu usage.
2536 INIT_WORK(&rdev
->del_work
, rdev_delayed_delete
);
2537 kobject_get(&rdev
->kobj
);
2538 queue_work(md_rdev_misc_wq
, &rdev
->del_work
);
2542 * prevent the device from being mounted, repartitioned or
2543 * otherwise reused by a RAID array (or any other kernel
2544 * subsystem), by bd_claiming the device.
2546 static int lock_rdev(struct md_rdev
*rdev
, dev_t dev
, int shared
)
2549 struct block_device
*bdev
;
2551 bdev
= blkdev_get_by_dev(dev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
,
2552 shared
? (struct md_rdev
*)lock_rdev
: rdev
);
2554 pr_warn("md: could not open device unknown-block(%u,%u).\n",
2555 MAJOR(dev
), MINOR(dev
));
2556 return PTR_ERR(bdev
);
2562 static void unlock_rdev(struct md_rdev
*rdev
)
2564 struct block_device
*bdev
= rdev
->bdev
;
2566 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
);
2569 void md_autodetect_dev(dev_t dev
);
2571 static void export_rdev(struct md_rdev
*rdev
)
2573 char b
[BDEVNAME_SIZE
];
2575 pr_debug("md: export_rdev(%s)\n", bdevname(rdev
->bdev
,b
));
2576 md_rdev_clear(rdev
);
2578 if (test_bit(AutoDetected
, &rdev
->flags
))
2579 md_autodetect_dev(rdev
->bdev
->bd_dev
);
2582 kobject_put(&rdev
->kobj
);
2585 void md_kick_rdev_from_array(struct md_rdev
*rdev
)
2587 unbind_rdev_from_array(rdev
);
2590 EXPORT_SYMBOL_GPL(md_kick_rdev_from_array
);
2592 static void export_array(struct mddev
*mddev
)
2594 struct md_rdev
*rdev
;
2596 while (!list_empty(&mddev
->disks
)) {
2597 rdev
= list_first_entry(&mddev
->disks
, struct md_rdev
,
2599 md_kick_rdev_from_array(rdev
);
2601 mddev
->raid_disks
= 0;
2602 mddev
->major_version
= 0;
2605 static bool set_in_sync(struct mddev
*mddev
)
2607 lockdep_assert_held(&mddev
->lock
);
2608 if (!mddev
->in_sync
) {
2609 mddev
->sync_checkers
++;
2610 spin_unlock(&mddev
->lock
);
2611 percpu_ref_switch_to_atomic_sync(&mddev
->writes_pending
);
2612 spin_lock(&mddev
->lock
);
2613 if (!mddev
->in_sync
&&
2614 percpu_ref_is_zero(&mddev
->writes_pending
)) {
2617 * Ensure ->in_sync is visible before we clear
2621 set_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
2622 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
2624 if (--mddev
->sync_checkers
== 0)
2625 percpu_ref_switch_to_percpu(&mddev
->writes_pending
);
2627 if (mddev
->safemode
== 1)
2628 mddev
->safemode
= 0;
2629 return mddev
->in_sync
;
2632 static void sync_sbs(struct mddev
*mddev
, int nospares
)
2634 /* Update each superblock (in-memory image), but
2635 * if we are allowed to, skip spares which already
2636 * have the right event counter, or have one earlier
2637 * (which would mean they aren't being marked as dirty
2638 * with the rest of the array)
2640 struct md_rdev
*rdev
;
2641 rdev_for_each(rdev
, mddev
) {
2642 if (rdev
->sb_events
== mddev
->events
||
2644 rdev
->raid_disk
< 0 &&
2645 rdev
->sb_events
+1 == mddev
->events
)) {
2646 /* Don't update this superblock */
2647 rdev
->sb_loaded
= 2;
2649 sync_super(mddev
, rdev
);
2650 rdev
->sb_loaded
= 1;
2655 static bool does_sb_need_changing(struct mddev
*mddev
)
2657 struct md_rdev
*rdev
;
2658 struct mdp_superblock_1
*sb
;
2661 /* Find a good rdev */
2662 rdev_for_each(rdev
, mddev
)
2663 if ((rdev
->raid_disk
>= 0) && !test_bit(Faulty
, &rdev
->flags
))
2666 /* No good device found. */
2670 sb
= page_address(rdev
->sb_page
);
2671 /* Check if a device has become faulty or a spare become active */
2672 rdev_for_each(rdev
, mddev
) {
2673 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
2674 /* Device activated? */
2675 if (role
== 0xffff && rdev
->raid_disk
>=0 &&
2676 !test_bit(Faulty
, &rdev
->flags
))
2678 /* Device turned faulty? */
2679 if (test_bit(Faulty
, &rdev
->flags
) && (role
< 0xfffd))
2683 /* Check if any mddev parameters have changed */
2684 if ((mddev
->dev_sectors
!= le64_to_cpu(sb
->size
)) ||
2685 (mddev
->reshape_position
!= le64_to_cpu(sb
->reshape_position
)) ||
2686 (mddev
->layout
!= le32_to_cpu(sb
->layout
)) ||
2687 (mddev
->raid_disks
!= le32_to_cpu(sb
->raid_disks
)) ||
2688 (mddev
->chunk_sectors
!= le32_to_cpu(sb
->chunksize
)))
2694 void md_update_sb(struct mddev
*mddev
, int force_change
)
2696 struct md_rdev
*rdev
;
2699 int any_badblocks_changed
= 0;
2704 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
2709 if (mddev_is_clustered(mddev
)) {
2710 if (test_and_clear_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
))
2712 if (test_and_clear_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
))
2714 ret
= md_cluster_ops
->metadata_update_start(mddev
);
2715 /* Has someone else has updated the sb */
2716 if (!does_sb_need_changing(mddev
)) {
2718 md_cluster_ops
->metadata_update_cancel(mddev
);
2719 bit_clear_unless(&mddev
->sb_flags
, BIT(MD_SB_CHANGE_PENDING
),
2720 BIT(MD_SB_CHANGE_DEVS
) |
2721 BIT(MD_SB_CHANGE_CLEAN
));
2727 * First make sure individual recovery_offsets are correct
2728 * curr_resync_completed can only be used during recovery.
2729 * During reshape/resync it might use array-addresses rather
2730 * that device addresses.
2732 rdev_for_each(rdev
, mddev
) {
2733 if (rdev
->raid_disk
>= 0 &&
2734 mddev
->delta_disks
>= 0 &&
2735 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
2736 test_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
) &&
2737 !test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
2738 !test_bit(Journal
, &rdev
->flags
) &&
2739 !test_bit(In_sync
, &rdev
->flags
) &&
2740 mddev
->curr_resync_completed
> rdev
->recovery_offset
)
2741 rdev
->recovery_offset
= mddev
->curr_resync_completed
;
2744 if (!mddev
->persistent
) {
2745 clear_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
2746 clear_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
2747 if (!mddev
->external
) {
2748 clear_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
2749 rdev_for_each(rdev
, mddev
) {
2750 if (rdev
->badblocks
.changed
) {
2751 rdev
->badblocks
.changed
= 0;
2752 ack_all_badblocks(&rdev
->badblocks
);
2753 md_error(mddev
, rdev
);
2755 clear_bit(Blocked
, &rdev
->flags
);
2756 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2757 wake_up(&rdev
->blocked_wait
);
2760 wake_up(&mddev
->sb_wait
);
2764 spin_lock(&mddev
->lock
);
2766 mddev
->utime
= ktime_get_real_seconds();
2768 if (test_and_clear_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
))
2770 if (test_and_clear_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
))
2771 /* just a clean<-> dirty transition, possibly leave spares alone,
2772 * though if events isn't the right even/odd, we will have to do
2778 if (mddev
->degraded
)
2779 /* If the array is degraded, then skipping spares is both
2780 * dangerous and fairly pointless.
2781 * Dangerous because a device that was removed from the array
2782 * might have a event_count that still looks up-to-date,
2783 * so it can be re-added without a resync.
2784 * Pointless because if there are any spares to skip,
2785 * then a recovery will happen and soon that array won't
2786 * be degraded any more and the spare can go back to sleep then.
2790 sync_req
= mddev
->in_sync
;
2792 /* If this is just a dirty<->clean transition, and the array is clean
2793 * and 'events' is odd, we can roll back to the previous clean state */
2795 && (mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
2796 && mddev
->can_decrease_events
2797 && mddev
->events
!= 1) {
2799 mddev
->can_decrease_events
= 0;
2801 /* otherwise we have to go forward and ... */
2803 mddev
->can_decrease_events
= nospares
;
2807 * This 64-bit counter should never wrap.
2808 * Either we are in around ~1 trillion A.C., assuming
2809 * 1 reboot per second, or we have a bug...
2811 WARN_ON(mddev
->events
== 0);
2813 rdev_for_each(rdev
, mddev
) {
2814 if (rdev
->badblocks
.changed
)
2815 any_badblocks_changed
++;
2816 if (test_bit(Faulty
, &rdev
->flags
))
2817 set_bit(FaultRecorded
, &rdev
->flags
);
2820 sync_sbs(mddev
, nospares
);
2821 spin_unlock(&mddev
->lock
);
2823 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2824 mdname(mddev
), mddev
->in_sync
);
2827 blk_add_trace_msg(mddev
->queue
, "md md_update_sb");
2829 md_bitmap_update_sb(mddev
->bitmap
);
2830 rdev_for_each(rdev
, mddev
) {
2831 char b
[BDEVNAME_SIZE
];
2833 if (rdev
->sb_loaded
!= 1)
2834 continue; /* no noise on spare devices */
2836 if (!test_bit(Faulty
, &rdev
->flags
)) {
2837 md_super_write(mddev
,rdev
,
2838 rdev
->sb_start
, rdev
->sb_size
,
2840 pr_debug("md: (write) %s's sb offset: %llu\n",
2841 bdevname(rdev
->bdev
, b
),
2842 (unsigned long long)rdev
->sb_start
);
2843 rdev
->sb_events
= mddev
->events
;
2844 if (rdev
->badblocks
.size
) {
2845 md_super_write(mddev
, rdev
,
2846 rdev
->badblocks
.sector
,
2847 rdev
->badblocks
.size
<< 9,
2849 rdev
->badblocks
.size
= 0;
2853 pr_debug("md: %s (skipping faulty)\n",
2854 bdevname(rdev
->bdev
, b
));
2856 if (mddev
->level
== LEVEL_MULTIPATH
)
2857 /* only need to write one superblock... */
2860 if (md_super_wait(mddev
) < 0)
2862 /* if there was a failure, MD_SB_CHANGE_DEVS was set, and we re-write super */
2864 if (mddev_is_clustered(mddev
) && ret
== 0)
2865 md_cluster_ops
->metadata_update_finish(mddev
);
2867 if (mddev
->in_sync
!= sync_req
||
2868 !bit_clear_unless(&mddev
->sb_flags
, BIT(MD_SB_CHANGE_PENDING
),
2869 BIT(MD_SB_CHANGE_DEVS
) | BIT(MD_SB_CHANGE_CLEAN
)))
2870 /* have to write it out again */
2872 wake_up(&mddev
->sb_wait
);
2873 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
2874 sysfs_notify_dirent_safe(mddev
->sysfs_completed
);
2876 rdev_for_each(rdev
, mddev
) {
2877 if (test_and_clear_bit(FaultRecorded
, &rdev
->flags
))
2878 clear_bit(Blocked
, &rdev
->flags
);
2880 if (any_badblocks_changed
)
2881 ack_all_badblocks(&rdev
->badblocks
);
2882 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2883 wake_up(&rdev
->blocked_wait
);
2886 EXPORT_SYMBOL(md_update_sb
);
2888 static int add_bound_rdev(struct md_rdev
*rdev
)
2890 struct mddev
*mddev
= rdev
->mddev
;
2892 bool add_journal
= test_bit(Journal
, &rdev
->flags
);
2894 if (!mddev
->pers
->hot_remove_disk
|| add_journal
) {
2895 /* If there is hot_add_disk but no hot_remove_disk
2896 * then added disks for geometry changes,
2897 * and should be added immediately.
2899 super_types
[mddev
->major_version
].
2900 validate_super(mddev
, rdev
);
2902 mddev_suspend(mddev
);
2903 err
= mddev
->pers
->hot_add_disk(mddev
, rdev
);
2905 mddev_resume(mddev
);
2907 md_kick_rdev_from_array(rdev
);
2911 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2913 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
2914 if (mddev
->degraded
)
2915 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
2916 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
2917 md_new_event(mddev
);
2918 md_wakeup_thread(mddev
->thread
);
2922 /* words written to sysfs files may, or may not, be \n terminated.
2923 * We want to accept with case. For this we use cmd_match.
2925 static int cmd_match(const char *cmd
, const char *str
)
2927 /* See if cmd, written into a sysfs file, matches
2928 * str. They must either be the same, or cmd can
2929 * have a trailing newline
2931 while (*cmd
&& *str
&& *cmd
== *str
) {
2942 struct rdev_sysfs_entry
{
2943 struct attribute attr
;
2944 ssize_t (*show
)(struct md_rdev
*, char *);
2945 ssize_t (*store
)(struct md_rdev
*, const char *, size_t);
2949 state_show(struct md_rdev
*rdev
, char *page
)
2953 unsigned long flags
= READ_ONCE(rdev
->flags
);
2955 if (test_bit(Faulty
, &flags
) ||
2956 (!test_bit(ExternalBbl
, &flags
) &&
2957 rdev
->badblocks
.unacked_exist
))
2958 len
+= sprintf(page
+len
, "faulty%s", sep
);
2959 if (test_bit(In_sync
, &flags
))
2960 len
+= sprintf(page
+len
, "in_sync%s", sep
);
2961 if (test_bit(Journal
, &flags
))
2962 len
+= sprintf(page
+len
, "journal%s", sep
);
2963 if (test_bit(WriteMostly
, &flags
))
2964 len
+= sprintf(page
+len
, "write_mostly%s", sep
);
2965 if (test_bit(Blocked
, &flags
) ||
2966 (rdev
->badblocks
.unacked_exist
2967 && !test_bit(Faulty
, &flags
)))
2968 len
+= sprintf(page
+len
, "blocked%s", sep
);
2969 if (!test_bit(Faulty
, &flags
) &&
2970 !test_bit(Journal
, &flags
) &&
2971 !test_bit(In_sync
, &flags
))
2972 len
+= sprintf(page
+len
, "spare%s", sep
);
2973 if (test_bit(WriteErrorSeen
, &flags
))
2974 len
+= sprintf(page
+len
, "write_error%s", sep
);
2975 if (test_bit(WantReplacement
, &flags
))
2976 len
+= sprintf(page
+len
, "want_replacement%s", sep
);
2977 if (test_bit(Replacement
, &flags
))
2978 len
+= sprintf(page
+len
, "replacement%s", sep
);
2979 if (test_bit(ExternalBbl
, &flags
))
2980 len
+= sprintf(page
+len
, "external_bbl%s", sep
);
2981 if (test_bit(FailFast
, &flags
))
2982 len
+= sprintf(page
+len
, "failfast%s", sep
);
2987 return len
+sprintf(page
+len
, "\n");
2991 state_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2994 * faulty - simulates an error
2995 * remove - disconnects the device
2996 * writemostly - sets write_mostly
2997 * -writemostly - clears write_mostly
2998 * blocked - sets the Blocked flags
2999 * -blocked - clears the Blocked and possibly simulates an error
3000 * insync - sets Insync providing device isn't active
3001 * -insync - clear Insync for a device with a slot assigned,
3002 * so that it gets rebuilt based on bitmap
3003 * write_error - sets WriteErrorSeen
3004 * -write_error - clears WriteErrorSeen
3005 * {,-}failfast - set/clear FailFast
3008 if (cmd_match(buf
, "faulty") && rdev
->mddev
->pers
) {
3009 md_error(rdev
->mddev
, rdev
);
3010 if (test_bit(Faulty
, &rdev
->flags
))
3014 } else if (cmd_match(buf
, "remove")) {
3015 if (rdev
->mddev
->pers
) {
3016 clear_bit(Blocked
, &rdev
->flags
);
3017 remove_and_add_spares(rdev
->mddev
, rdev
);
3019 if (rdev
->raid_disk
>= 0)
3022 struct mddev
*mddev
= rdev
->mddev
;
3024 if (mddev_is_clustered(mddev
))
3025 err
= md_cluster_ops
->remove_disk(mddev
, rdev
);
3028 md_kick_rdev_from_array(rdev
);
3030 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
3031 md_wakeup_thread(mddev
->thread
);
3033 md_new_event(mddev
);
3036 } else if (cmd_match(buf
, "writemostly")) {
3037 set_bit(WriteMostly
, &rdev
->flags
);
3038 mddev_create_serial_pool(rdev
->mddev
, rdev
, false);
3040 } else if (cmd_match(buf
, "-writemostly")) {
3041 mddev_destroy_serial_pool(rdev
->mddev
, rdev
, false);
3042 clear_bit(WriteMostly
, &rdev
->flags
);
3044 } else if (cmd_match(buf
, "blocked")) {
3045 set_bit(Blocked
, &rdev
->flags
);
3047 } else if (cmd_match(buf
, "-blocked")) {
3048 if (!test_bit(Faulty
, &rdev
->flags
) &&
3049 !test_bit(ExternalBbl
, &rdev
->flags
) &&
3050 rdev
->badblocks
.unacked_exist
) {
3051 /* metadata handler doesn't understand badblocks,
3052 * so we need to fail the device
3054 md_error(rdev
->mddev
, rdev
);
3056 clear_bit(Blocked
, &rdev
->flags
);
3057 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
3058 wake_up(&rdev
->blocked_wait
);
3059 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
3060 md_wakeup_thread(rdev
->mddev
->thread
);
3063 } else if (cmd_match(buf
, "insync") && rdev
->raid_disk
== -1) {
3064 set_bit(In_sync
, &rdev
->flags
);
3066 } else if (cmd_match(buf
, "failfast")) {
3067 set_bit(FailFast
, &rdev
->flags
);
3069 } else if (cmd_match(buf
, "-failfast")) {
3070 clear_bit(FailFast
, &rdev
->flags
);
3072 } else if (cmd_match(buf
, "-insync") && rdev
->raid_disk
>= 0 &&
3073 !test_bit(Journal
, &rdev
->flags
)) {
3074 if (rdev
->mddev
->pers
== NULL
) {
3075 clear_bit(In_sync
, &rdev
->flags
);
3076 rdev
->saved_raid_disk
= rdev
->raid_disk
;
3077 rdev
->raid_disk
= -1;
3080 } else if (cmd_match(buf
, "write_error")) {
3081 set_bit(WriteErrorSeen
, &rdev
->flags
);
3083 } else if (cmd_match(buf
, "-write_error")) {
3084 clear_bit(WriteErrorSeen
, &rdev
->flags
);
3086 } else if (cmd_match(buf
, "want_replacement")) {
3087 /* Any non-spare device that is not a replacement can
3088 * become want_replacement at any time, but we then need to
3089 * check if recovery is needed.
3091 if (rdev
->raid_disk
>= 0 &&
3092 !test_bit(Journal
, &rdev
->flags
) &&
3093 !test_bit(Replacement
, &rdev
->flags
))
3094 set_bit(WantReplacement
, &rdev
->flags
);
3095 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
3096 md_wakeup_thread(rdev
->mddev
->thread
);
3098 } else if (cmd_match(buf
, "-want_replacement")) {
3099 /* Clearing 'want_replacement' is always allowed.
3100 * Once replacements starts it is too late though.
3103 clear_bit(WantReplacement
, &rdev
->flags
);
3104 } else if (cmd_match(buf
, "replacement")) {
3105 /* Can only set a device as a replacement when array has not
3106 * yet been started. Once running, replacement is automatic
3107 * from spares, or by assigning 'slot'.
3109 if (rdev
->mddev
->pers
)
3112 set_bit(Replacement
, &rdev
->flags
);
3115 } else if (cmd_match(buf
, "-replacement")) {
3116 /* Similarly, can only clear Replacement before start */
3117 if (rdev
->mddev
->pers
)
3120 clear_bit(Replacement
, &rdev
->flags
);
3123 } else if (cmd_match(buf
, "re-add")) {
3124 if (!rdev
->mddev
->pers
)
3126 else if (test_bit(Faulty
, &rdev
->flags
) && (rdev
->raid_disk
== -1) &&
3127 rdev
->saved_raid_disk
>= 0) {
3128 /* clear_bit is performed _after_ all the devices
3129 * have their local Faulty bit cleared. If any writes
3130 * happen in the meantime in the local node, they
3131 * will land in the local bitmap, which will be synced
3132 * by this node eventually
3134 if (!mddev_is_clustered(rdev
->mddev
) ||
3135 (err
= md_cluster_ops
->gather_bitmaps(rdev
)) == 0) {
3136 clear_bit(Faulty
, &rdev
->flags
);
3137 err
= add_bound_rdev(rdev
);
3141 } else if (cmd_match(buf
, "external_bbl") && (rdev
->mddev
->external
)) {
3142 set_bit(ExternalBbl
, &rdev
->flags
);
3143 rdev
->badblocks
.shift
= 0;
3145 } else if (cmd_match(buf
, "-external_bbl") && (rdev
->mddev
->external
)) {
3146 clear_bit(ExternalBbl
, &rdev
->flags
);
3150 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
3151 return err
? err
: len
;
3153 static struct rdev_sysfs_entry rdev_state
=
3154 __ATTR_PREALLOC(state
, S_IRUGO
|S_IWUSR
, state_show
, state_store
);
3157 errors_show(struct md_rdev
*rdev
, char *page
)
3159 return sprintf(page
, "%d\n", atomic_read(&rdev
->corrected_errors
));
3163 errors_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3168 rv
= kstrtouint(buf
, 10, &n
);
3171 atomic_set(&rdev
->corrected_errors
, n
);
3174 static struct rdev_sysfs_entry rdev_errors
=
3175 __ATTR(errors
, S_IRUGO
|S_IWUSR
, errors_show
, errors_store
);
3178 slot_show(struct md_rdev
*rdev
, char *page
)
3180 if (test_bit(Journal
, &rdev
->flags
))
3181 return sprintf(page
, "journal\n");
3182 else if (rdev
->raid_disk
< 0)
3183 return sprintf(page
, "none\n");
3185 return sprintf(page
, "%d\n", rdev
->raid_disk
);
3189 slot_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3194 if (test_bit(Journal
, &rdev
->flags
))
3196 if (strncmp(buf
, "none", 4)==0)
3199 err
= kstrtouint(buf
, 10, (unsigned int *)&slot
);
3203 if (rdev
->mddev
->pers
&& slot
== -1) {
3204 /* Setting 'slot' on an active array requires also
3205 * updating the 'rd%d' link, and communicating
3206 * with the personality with ->hot_*_disk.
3207 * For now we only support removing
3208 * failed/spare devices. This normally happens automatically,
3209 * but not when the metadata is externally managed.
3211 if (rdev
->raid_disk
== -1)
3213 /* personality does all needed checks */
3214 if (rdev
->mddev
->pers
->hot_remove_disk
== NULL
)
3216 clear_bit(Blocked
, &rdev
->flags
);
3217 remove_and_add_spares(rdev
->mddev
, rdev
);
3218 if (rdev
->raid_disk
>= 0)
3220 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
3221 md_wakeup_thread(rdev
->mddev
->thread
);
3222 } else if (rdev
->mddev
->pers
) {
3223 /* Activating a spare .. or possibly reactivating
3224 * if we ever get bitmaps working here.
3228 if (rdev
->raid_disk
!= -1)
3231 if (test_bit(MD_RECOVERY_RUNNING
, &rdev
->mddev
->recovery
))
3234 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
3237 if (slot
>= rdev
->mddev
->raid_disks
&&
3238 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
3241 rdev
->raid_disk
= slot
;
3242 if (test_bit(In_sync
, &rdev
->flags
))
3243 rdev
->saved_raid_disk
= slot
;
3245 rdev
->saved_raid_disk
= -1;
3246 clear_bit(In_sync
, &rdev
->flags
);
3247 clear_bit(Bitmap_sync
, &rdev
->flags
);
3248 err
= rdev
->mddev
->pers
->hot_add_disk(rdev
->mddev
, rdev
);
3250 rdev
->raid_disk
= -1;
3253 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
3254 /* failure here is OK */;
3255 sysfs_link_rdev(rdev
->mddev
, rdev
);
3256 /* don't wakeup anyone, leave that to userspace. */
3258 if (slot
>= rdev
->mddev
->raid_disks
&&
3259 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
3261 rdev
->raid_disk
= slot
;
3262 /* assume it is working */
3263 clear_bit(Faulty
, &rdev
->flags
);
3264 clear_bit(WriteMostly
, &rdev
->flags
);
3265 set_bit(In_sync
, &rdev
->flags
);
3266 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
3271 static struct rdev_sysfs_entry rdev_slot
=
3272 __ATTR(slot
, S_IRUGO
|S_IWUSR
, slot_show
, slot_store
);
3275 offset_show(struct md_rdev
*rdev
, char *page
)
3277 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->data_offset
);
3281 offset_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3283 unsigned long long offset
;
3284 if (kstrtoull(buf
, 10, &offset
) < 0)
3286 if (rdev
->mddev
->pers
&& rdev
->raid_disk
>= 0)
3288 if (rdev
->sectors
&& rdev
->mddev
->external
)
3289 /* Must set offset before size, so overlap checks
3292 rdev
->data_offset
= offset
;
3293 rdev
->new_data_offset
= offset
;
3297 static struct rdev_sysfs_entry rdev_offset
=
3298 __ATTR(offset
, S_IRUGO
|S_IWUSR
, offset_show
, offset_store
);
3300 static ssize_t
new_offset_show(struct md_rdev
*rdev
, char *page
)
3302 return sprintf(page
, "%llu\n",
3303 (unsigned long long)rdev
->new_data_offset
);
3306 static ssize_t
new_offset_store(struct md_rdev
*rdev
,
3307 const char *buf
, size_t len
)
3309 unsigned long long new_offset
;
3310 struct mddev
*mddev
= rdev
->mddev
;
3312 if (kstrtoull(buf
, 10, &new_offset
) < 0)
3315 if (mddev
->sync_thread
||
3316 test_bit(MD_RECOVERY_RUNNING
,&mddev
->recovery
))
3318 if (new_offset
== rdev
->data_offset
)
3319 /* reset is always permitted */
3321 else if (new_offset
> rdev
->data_offset
) {
3322 /* must not push array size beyond rdev_sectors */
3323 if (new_offset
- rdev
->data_offset
3324 + mddev
->dev_sectors
> rdev
->sectors
)
3327 /* Metadata worries about other space details. */
3329 /* decreasing the offset is inconsistent with a backwards
3332 if (new_offset
< rdev
->data_offset
&&
3333 mddev
->reshape_backwards
)
3335 /* Increasing offset is inconsistent with forwards
3336 * reshape. reshape_direction should be set to
3337 * 'backwards' first.
3339 if (new_offset
> rdev
->data_offset
&&
3340 !mddev
->reshape_backwards
)
3343 if (mddev
->pers
&& mddev
->persistent
&&
3344 !super_types
[mddev
->major_version
]
3345 .allow_new_offset(rdev
, new_offset
))
3347 rdev
->new_data_offset
= new_offset
;
3348 if (new_offset
> rdev
->data_offset
)
3349 mddev
->reshape_backwards
= 1;
3350 else if (new_offset
< rdev
->data_offset
)
3351 mddev
->reshape_backwards
= 0;
3355 static struct rdev_sysfs_entry rdev_new_offset
=
3356 __ATTR(new_offset
, S_IRUGO
|S_IWUSR
, new_offset_show
, new_offset_store
);
3359 rdev_size_show(struct md_rdev
*rdev
, char *page
)
3361 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->sectors
/ 2);
3364 static int overlaps(sector_t s1
, sector_t l1
, sector_t s2
, sector_t l2
)
3366 /* check if two start/length pairs overlap */
3374 static int strict_blocks_to_sectors(const char *buf
, sector_t
*sectors
)
3376 unsigned long long blocks
;
3379 if (kstrtoull(buf
, 10, &blocks
) < 0)
3382 if (blocks
& 1ULL << (8 * sizeof(blocks
) - 1))
3383 return -EINVAL
; /* sector conversion overflow */
3386 if (new != blocks
* 2)
3387 return -EINVAL
; /* unsigned long long to sector_t overflow */
3394 rdev_size_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3396 struct mddev
*my_mddev
= rdev
->mddev
;
3397 sector_t oldsectors
= rdev
->sectors
;
3400 if (test_bit(Journal
, &rdev
->flags
))
3402 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
3404 if (rdev
->data_offset
!= rdev
->new_data_offset
)
3405 return -EINVAL
; /* too confusing */
3406 if (my_mddev
->pers
&& rdev
->raid_disk
>= 0) {
3407 if (my_mddev
->persistent
) {
3408 sectors
= super_types
[my_mddev
->major_version
].
3409 rdev_size_change(rdev
, sectors
);
3412 } else if (!sectors
)
3413 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) -
3415 if (!my_mddev
->pers
->resize
)
3416 /* Cannot change size for RAID0 or Linear etc */
3419 if (sectors
< my_mddev
->dev_sectors
)
3420 return -EINVAL
; /* component must fit device */
3422 rdev
->sectors
= sectors
;
3423 if (sectors
> oldsectors
&& my_mddev
->external
) {
3424 /* Need to check that all other rdevs with the same
3425 * ->bdev do not overlap. 'rcu' is sufficient to walk
3426 * the rdev lists safely.
3427 * This check does not provide a hard guarantee, it
3428 * just helps avoid dangerous mistakes.
3430 struct mddev
*mddev
;
3432 struct list_head
*tmp
;
3435 for_each_mddev(mddev
, tmp
) {
3436 struct md_rdev
*rdev2
;
3438 rdev_for_each(rdev2
, mddev
)
3439 if (rdev
->bdev
== rdev2
->bdev
&&
3441 overlaps(rdev
->data_offset
, rdev
->sectors
,
3454 /* Someone else could have slipped in a size
3455 * change here, but doing so is just silly.
3456 * We put oldsectors back because we *know* it is
3457 * safe, and trust userspace not to race with
3460 rdev
->sectors
= oldsectors
;
3467 static struct rdev_sysfs_entry rdev_size
=
3468 __ATTR(size
, S_IRUGO
|S_IWUSR
, rdev_size_show
, rdev_size_store
);
3470 static ssize_t
recovery_start_show(struct md_rdev
*rdev
, char *page
)
3472 unsigned long long recovery_start
= rdev
->recovery_offset
;
3474 if (test_bit(In_sync
, &rdev
->flags
) ||
3475 recovery_start
== MaxSector
)
3476 return sprintf(page
, "none\n");
3478 return sprintf(page
, "%llu\n", recovery_start
);
3481 static ssize_t
recovery_start_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3483 unsigned long long recovery_start
;
3485 if (cmd_match(buf
, "none"))
3486 recovery_start
= MaxSector
;
3487 else if (kstrtoull(buf
, 10, &recovery_start
))
3490 if (rdev
->mddev
->pers
&&
3491 rdev
->raid_disk
>= 0)
3494 rdev
->recovery_offset
= recovery_start
;
3495 if (recovery_start
== MaxSector
)
3496 set_bit(In_sync
, &rdev
->flags
);
3498 clear_bit(In_sync
, &rdev
->flags
);
3502 static struct rdev_sysfs_entry rdev_recovery_start
=
3503 __ATTR(recovery_start
, S_IRUGO
|S_IWUSR
, recovery_start_show
, recovery_start_store
);
3505 /* sysfs access to bad-blocks list.
3506 * We present two files.
3507 * 'bad-blocks' lists sector numbers and lengths of ranges that
3508 * are recorded as bad. The list is truncated to fit within
3509 * the one-page limit of sysfs.
3510 * Writing "sector length" to this file adds an acknowledged
3512 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
3513 * been acknowledged. Writing to this file adds bad blocks
3514 * without acknowledging them. This is largely for testing.
3516 static ssize_t
bb_show(struct md_rdev
*rdev
, char *page
)
3518 return badblocks_show(&rdev
->badblocks
, page
, 0);
3520 static ssize_t
bb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
3522 int rv
= badblocks_store(&rdev
->badblocks
, page
, len
, 0);
3523 /* Maybe that ack was all we needed */
3524 if (test_and_clear_bit(BlockedBadBlocks
, &rdev
->flags
))
3525 wake_up(&rdev
->blocked_wait
);
3528 static struct rdev_sysfs_entry rdev_bad_blocks
=
3529 __ATTR(bad_blocks
, S_IRUGO
|S_IWUSR
, bb_show
, bb_store
);
3531 static ssize_t
ubb_show(struct md_rdev
*rdev
, char *page
)
3533 return badblocks_show(&rdev
->badblocks
, page
, 1);
3535 static ssize_t
ubb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
3537 return badblocks_store(&rdev
->badblocks
, page
, len
, 1);
3539 static struct rdev_sysfs_entry rdev_unack_bad_blocks
=
3540 __ATTR(unacknowledged_bad_blocks
, S_IRUGO
|S_IWUSR
, ubb_show
, ubb_store
);
3543 ppl_sector_show(struct md_rdev
*rdev
, char *page
)
3545 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->ppl
.sector
);
3549 ppl_sector_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3551 unsigned long long sector
;
3553 if (kstrtoull(buf
, 10, §or
) < 0)
3555 if (sector
!= (sector_t
)sector
)
3558 if (rdev
->mddev
->pers
&& test_bit(MD_HAS_PPL
, &rdev
->mddev
->flags
) &&
3559 rdev
->raid_disk
>= 0)
3562 if (rdev
->mddev
->persistent
) {
3563 if (rdev
->mddev
->major_version
== 0)
3565 if ((sector
> rdev
->sb_start
&&
3566 sector
- rdev
->sb_start
> S16_MAX
) ||
3567 (sector
< rdev
->sb_start
&&
3568 rdev
->sb_start
- sector
> -S16_MIN
))
3570 rdev
->ppl
.offset
= sector
- rdev
->sb_start
;
3571 } else if (!rdev
->mddev
->external
) {
3574 rdev
->ppl
.sector
= sector
;
3578 static struct rdev_sysfs_entry rdev_ppl_sector
=
3579 __ATTR(ppl_sector
, S_IRUGO
|S_IWUSR
, ppl_sector_show
, ppl_sector_store
);
3582 ppl_size_show(struct md_rdev
*rdev
, char *page
)
3584 return sprintf(page
, "%u\n", rdev
->ppl
.size
);
3588 ppl_size_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3592 if (kstrtouint(buf
, 10, &size
) < 0)
3595 if (rdev
->mddev
->pers
&& test_bit(MD_HAS_PPL
, &rdev
->mddev
->flags
) &&
3596 rdev
->raid_disk
>= 0)
3599 if (rdev
->mddev
->persistent
) {
3600 if (rdev
->mddev
->major_version
== 0)
3604 } else if (!rdev
->mddev
->external
) {
3607 rdev
->ppl
.size
= size
;
3611 static struct rdev_sysfs_entry rdev_ppl_size
=
3612 __ATTR(ppl_size
, S_IRUGO
|S_IWUSR
, ppl_size_show
, ppl_size_store
);
3614 static struct attribute
*rdev_default_attrs
[] = {
3619 &rdev_new_offset
.attr
,
3621 &rdev_recovery_start
.attr
,
3622 &rdev_bad_blocks
.attr
,
3623 &rdev_unack_bad_blocks
.attr
,
3624 &rdev_ppl_sector
.attr
,
3625 &rdev_ppl_size
.attr
,
3629 rdev_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
3631 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
3632 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
3638 return entry
->show(rdev
, page
);
3642 rdev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
3643 const char *page
, size_t length
)
3645 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
3646 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
3648 struct mddev
*mddev
= rdev
->mddev
;
3652 if (!capable(CAP_SYS_ADMIN
))
3654 rv
= mddev
? mddev_lock(mddev
) : -ENODEV
;
3656 if (rdev
->mddev
== NULL
)
3659 rv
= entry
->store(rdev
, page
, length
);
3660 mddev_unlock(mddev
);
3665 static void rdev_free(struct kobject
*ko
)
3667 struct md_rdev
*rdev
= container_of(ko
, struct md_rdev
, kobj
);
3670 static const struct sysfs_ops rdev_sysfs_ops
= {
3671 .show
= rdev_attr_show
,
3672 .store
= rdev_attr_store
,
3674 static struct kobj_type rdev_ktype
= {
3675 .release
= rdev_free
,
3676 .sysfs_ops
= &rdev_sysfs_ops
,
3677 .default_attrs
= rdev_default_attrs
,
3680 int md_rdev_init(struct md_rdev
*rdev
)
3683 rdev
->saved_raid_disk
= -1;
3684 rdev
->raid_disk
= -1;
3686 rdev
->data_offset
= 0;
3687 rdev
->new_data_offset
= 0;
3688 rdev
->sb_events
= 0;
3689 rdev
->last_read_error
= 0;
3690 rdev
->sb_loaded
= 0;
3691 rdev
->bb_page
= NULL
;
3692 atomic_set(&rdev
->nr_pending
, 0);
3693 atomic_set(&rdev
->read_errors
, 0);
3694 atomic_set(&rdev
->corrected_errors
, 0);
3696 INIT_LIST_HEAD(&rdev
->same_set
);
3697 init_waitqueue_head(&rdev
->blocked_wait
);
3699 /* Add space to store bad block list.
3700 * This reserves the space even on arrays where it cannot
3701 * be used - I wonder if that matters
3703 return badblocks_init(&rdev
->badblocks
, 0);
3705 EXPORT_SYMBOL_GPL(md_rdev_init
);
3707 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3709 * mark the device faulty if:
3711 * - the device is nonexistent (zero size)
3712 * - the device has no valid superblock
3714 * a faulty rdev _never_ has rdev->sb set.
3716 static struct md_rdev
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
3718 char b
[BDEVNAME_SIZE
];
3720 struct md_rdev
*rdev
;
3723 rdev
= kzalloc(sizeof(*rdev
), GFP_KERNEL
);
3725 return ERR_PTR(-ENOMEM
);
3727 err
= md_rdev_init(rdev
);
3730 err
= alloc_disk_sb(rdev
);
3734 err
= lock_rdev(rdev
, newdev
, super_format
== -2);
3738 kobject_init(&rdev
->kobj
, &rdev_ktype
);
3740 size
= i_size_read(rdev
->bdev
->bd_inode
) >> BLOCK_SIZE_BITS
;
3742 pr_warn("md: %s has zero or unknown size, marking faulty!\n",
3743 bdevname(rdev
->bdev
,b
));
3748 if (super_format
>= 0) {
3749 err
= super_types
[super_format
].
3750 load_super(rdev
, NULL
, super_minor
);
3751 if (err
== -EINVAL
) {
3752 pr_warn("md: %s does not have a valid v%d.%d superblock, not importing!\n",
3753 bdevname(rdev
->bdev
,b
),
3754 super_format
, super_minor
);
3758 pr_warn("md: could not read %s's sb, not importing!\n",
3759 bdevname(rdev
->bdev
,b
));
3769 md_rdev_clear(rdev
);
3771 return ERR_PTR(err
);
3775 * Check a full RAID array for plausibility
3778 static int analyze_sbs(struct mddev
*mddev
)
3781 struct md_rdev
*rdev
, *freshest
, *tmp
;
3782 char b
[BDEVNAME_SIZE
];
3785 rdev_for_each_safe(rdev
, tmp
, mddev
)
3786 switch (super_types
[mddev
->major_version
].
3787 load_super(rdev
, freshest
, mddev
->minor_version
)) {
3794 pr_warn("md: fatal superblock inconsistency in %s -- removing from array\n",
3795 bdevname(rdev
->bdev
,b
));
3796 md_kick_rdev_from_array(rdev
);
3799 /* Cannot find a valid fresh disk */
3801 pr_warn("md: cannot find a valid disk\n");
3805 super_types
[mddev
->major_version
].
3806 validate_super(mddev
, freshest
);
3809 rdev_for_each_safe(rdev
, tmp
, mddev
) {
3810 if (mddev
->max_disks
&&
3811 (rdev
->desc_nr
>= mddev
->max_disks
||
3812 i
> mddev
->max_disks
)) {
3813 pr_warn("md: %s: %s: only %d devices permitted\n",
3814 mdname(mddev
), bdevname(rdev
->bdev
, b
),
3816 md_kick_rdev_from_array(rdev
);
3819 if (rdev
!= freshest
) {
3820 if (super_types
[mddev
->major_version
].
3821 validate_super(mddev
, rdev
)) {
3822 pr_warn("md: kicking non-fresh %s from array!\n",
3823 bdevname(rdev
->bdev
,b
));
3824 md_kick_rdev_from_array(rdev
);
3828 if (mddev
->level
== LEVEL_MULTIPATH
) {
3829 rdev
->desc_nr
= i
++;
3830 rdev
->raid_disk
= rdev
->desc_nr
;
3831 set_bit(In_sync
, &rdev
->flags
);
3832 } else if (rdev
->raid_disk
>=
3833 (mddev
->raid_disks
- min(0, mddev
->delta_disks
)) &&
3834 !test_bit(Journal
, &rdev
->flags
)) {
3835 rdev
->raid_disk
= -1;
3836 clear_bit(In_sync
, &rdev
->flags
);
3843 /* Read a fixed-point number.
3844 * Numbers in sysfs attributes should be in "standard" units where
3845 * possible, so time should be in seconds.
3846 * However we internally use a a much smaller unit such as
3847 * milliseconds or jiffies.
3848 * This function takes a decimal number with a possible fractional
3849 * component, and produces an integer which is the result of
3850 * multiplying that number by 10^'scale'.
3851 * all without any floating-point arithmetic.
3853 int strict_strtoul_scaled(const char *cp
, unsigned long *res
, int scale
)
3855 unsigned long result
= 0;
3857 while (isdigit(*cp
) || (*cp
== '.' && decimals
< 0)) {
3860 else if (decimals
< scale
) {
3863 result
= result
* 10 + value
;
3875 *res
= result
* int_pow(10, scale
- decimals
);
3880 safe_delay_show(struct mddev
*mddev
, char *page
)
3882 int msec
= (mddev
->safemode_delay
*1000)/HZ
;
3883 return sprintf(page
, "%d.%03d\n", msec
/1000, msec
%1000);
3886 safe_delay_store(struct mddev
*mddev
, const char *cbuf
, size_t len
)
3890 if (mddev_is_clustered(mddev
)) {
3891 pr_warn("md: Safemode is disabled for clustered mode\n");
3895 if (strict_strtoul_scaled(cbuf
, &msec
, 3) < 0)
3898 mddev
->safemode_delay
= 0;
3900 unsigned long old_delay
= mddev
->safemode_delay
;
3901 unsigned long new_delay
= (msec
*HZ
)/1000;
3905 mddev
->safemode_delay
= new_delay
;
3906 if (new_delay
< old_delay
|| old_delay
== 0)
3907 mod_timer(&mddev
->safemode_timer
, jiffies
+1);
3911 static struct md_sysfs_entry md_safe_delay
=
3912 __ATTR(safe_mode_delay
, S_IRUGO
|S_IWUSR
,safe_delay_show
, safe_delay_store
);
3915 level_show(struct mddev
*mddev
, char *page
)
3917 struct md_personality
*p
;
3919 spin_lock(&mddev
->lock
);
3922 ret
= sprintf(page
, "%s\n", p
->name
);
3923 else if (mddev
->clevel
[0])
3924 ret
= sprintf(page
, "%s\n", mddev
->clevel
);
3925 else if (mddev
->level
!= LEVEL_NONE
)
3926 ret
= sprintf(page
, "%d\n", mddev
->level
);
3929 spin_unlock(&mddev
->lock
);
3934 level_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3939 struct md_personality
*pers
, *oldpers
;
3941 void *priv
, *oldpriv
;
3942 struct md_rdev
*rdev
;
3944 if (slen
== 0 || slen
>= sizeof(clevel
))
3947 rv
= mddev_lock(mddev
);
3951 if (mddev
->pers
== NULL
) {
3952 strncpy(mddev
->clevel
, buf
, slen
);
3953 if (mddev
->clevel
[slen
-1] == '\n')
3955 mddev
->clevel
[slen
] = 0;
3956 mddev
->level
= LEVEL_NONE
;
3964 /* request to change the personality. Need to ensure:
3965 * - array is not engaged in resync/recovery/reshape
3966 * - old personality can be suspended
3967 * - new personality will access other array.
3971 if (mddev
->sync_thread
||
3972 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
3973 mddev
->reshape_position
!= MaxSector
||
3974 mddev
->sysfs_active
)
3978 if (!mddev
->pers
->quiesce
) {
3979 pr_warn("md: %s: %s does not support online personality change\n",
3980 mdname(mddev
), mddev
->pers
->name
);
3984 /* Now find the new personality */
3985 strncpy(clevel
, buf
, slen
);
3986 if (clevel
[slen
-1] == '\n')
3989 if (kstrtol(clevel
, 10, &level
))
3992 if (request_module("md-%s", clevel
) != 0)
3993 request_module("md-level-%s", clevel
);
3994 spin_lock(&pers_lock
);
3995 pers
= find_pers(level
, clevel
);
3996 if (!pers
|| !try_module_get(pers
->owner
)) {
3997 spin_unlock(&pers_lock
);
3998 pr_warn("md: personality %s not loaded\n", clevel
);
4002 spin_unlock(&pers_lock
);
4004 if (pers
== mddev
->pers
) {
4005 /* Nothing to do! */
4006 module_put(pers
->owner
);
4010 if (!pers
->takeover
) {
4011 module_put(pers
->owner
);
4012 pr_warn("md: %s: %s does not support personality takeover\n",
4013 mdname(mddev
), clevel
);
4018 rdev_for_each(rdev
, mddev
)
4019 rdev
->new_raid_disk
= rdev
->raid_disk
;
4021 /* ->takeover must set new_* and/or delta_disks
4022 * if it succeeds, and may set them when it fails.
4024 priv
= pers
->takeover(mddev
);
4026 mddev
->new_level
= mddev
->level
;
4027 mddev
->new_layout
= mddev
->layout
;
4028 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
4029 mddev
->raid_disks
-= mddev
->delta_disks
;
4030 mddev
->delta_disks
= 0;
4031 mddev
->reshape_backwards
= 0;
4032 module_put(pers
->owner
);
4033 pr_warn("md: %s: %s would not accept array\n",
4034 mdname(mddev
), clevel
);
4039 /* Looks like we have a winner */
4040 mddev_suspend(mddev
);
4041 mddev_detach(mddev
);
4043 spin_lock(&mddev
->lock
);
4044 oldpers
= mddev
->pers
;
4045 oldpriv
= mddev
->private;
4047 mddev
->private = priv
;
4048 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
4049 mddev
->level
= mddev
->new_level
;
4050 mddev
->layout
= mddev
->new_layout
;
4051 mddev
->chunk_sectors
= mddev
->new_chunk_sectors
;
4052 mddev
->delta_disks
= 0;
4053 mddev
->reshape_backwards
= 0;
4054 mddev
->degraded
= 0;
4055 spin_unlock(&mddev
->lock
);
4057 if (oldpers
->sync_request
== NULL
&&
4059 /* We are converting from a no-redundancy array
4060 * to a redundancy array and metadata is managed
4061 * externally so we need to be sure that writes
4062 * won't block due to a need to transition
4064 * until external management is started.
4067 mddev
->safemode_delay
= 0;
4068 mddev
->safemode
= 0;
4071 oldpers
->free(mddev
, oldpriv
);
4073 if (oldpers
->sync_request
== NULL
&&
4074 pers
->sync_request
!= NULL
) {
4075 /* need to add the md_redundancy_group */
4076 if (sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
4077 pr_warn("md: cannot register extra attributes for %s\n",
4079 mddev
->sysfs_action
= sysfs_get_dirent(mddev
->kobj
.sd
, "sync_action");
4080 mddev
->sysfs_completed
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "sync_completed");
4081 mddev
->sysfs_degraded
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "degraded");
4083 if (oldpers
->sync_request
!= NULL
&&
4084 pers
->sync_request
== NULL
) {
4085 /* need to remove the md_redundancy_group */
4086 if (mddev
->to_remove
== NULL
)
4087 mddev
->to_remove
= &md_redundancy_group
;
4090 module_put(oldpers
->owner
);
4092 rdev_for_each(rdev
, mddev
) {
4093 if (rdev
->raid_disk
< 0)
4095 if (rdev
->new_raid_disk
>= mddev
->raid_disks
)
4096 rdev
->new_raid_disk
= -1;
4097 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
4099 sysfs_unlink_rdev(mddev
, rdev
);
4101 rdev_for_each(rdev
, mddev
) {
4102 if (rdev
->raid_disk
< 0)
4104 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
4106 rdev
->raid_disk
= rdev
->new_raid_disk
;
4107 if (rdev
->raid_disk
< 0)
4108 clear_bit(In_sync
, &rdev
->flags
);
4110 if (sysfs_link_rdev(mddev
, rdev
))
4111 pr_warn("md: cannot register rd%d for %s after level change\n",
4112 rdev
->raid_disk
, mdname(mddev
));
4116 if (pers
->sync_request
== NULL
) {
4117 /* this is now an array without redundancy, so
4118 * it must always be in_sync
4121 del_timer_sync(&mddev
->safemode_timer
);
4123 blk_set_stacking_limits(&mddev
->queue
->limits
);
4125 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
4126 mddev_resume(mddev
);
4128 md_update_sb(mddev
, 1);
4129 sysfs_notify_dirent_safe(mddev
->sysfs_level
);
4130 md_new_event(mddev
);
4133 mddev_unlock(mddev
);
4137 static struct md_sysfs_entry md_level
=
4138 __ATTR(level
, S_IRUGO
|S_IWUSR
, level_show
, level_store
);
4141 layout_show(struct mddev
*mddev
, char *page
)
4143 /* just a number, not meaningful for all levels */
4144 if (mddev
->reshape_position
!= MaxSector
&&
4145 mddev
->layout
!= mddev
->new_layout
)
4146 return sprintf(page
, "%d (%d)\n",
4147 mddev
->new_layout
, mddev
->layout
);
4148 return sprintf(page
, "%d\n", mddev
->layout
);
4152 layout_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4157 err
= kstrtouint(buf
, 10, &n
);
4160 err
= mddev_lock(mddev
);
4165 if (mddev
->pers
->check_reshape
== NULL
)
4170 mddev
->new_layout
= n
;
4171 err
= mddev
->pers
->check_reshape(mddev
);
4173 mddev
->new_layout
= mddev
->layout
;
4176 mddev
->new_layout
= n
;
4177 if (mddev
->reshape_position
== MaxSector
)
4180 mddev_unlock(mddev
);
4183 static struct md_sysfs_entry md_layout
=
4184 __ATTR(layout
, S_IRUGO
|S_IWUSR
, layout_show
, layout_store
);
4187 raid_disks_show(struct mddev
*mddev
, char *page
)
4189 if (mddev
->raid_disks
== 0)
4191 if (mddev
->reshape_position
!= MaxSector
&&
4192 mddev
->delta_disks
!= 0)
4193 return sprintf(page
, "%d (%d)\n", mddev
->raid_disks
,
4194 mddev
->raid_disks
- mddev
->delta_disks
);
4195 return sprintf(page
, "%d\n", mddev
->raid_disks
);
4198 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
);
4201 raid_disks_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4206 err
= kstrtouint(buf
, 10, &n
);
4210 err
= mddev_lock(mddev
);
4214 err
= update_raid_disks(mddev
, n
);
4215 else if (mddev
->reshape_position
!= MaxSector
) {
4216 struct md_rdev
*rdev
;
4217 int olddisks
= mddev
->raid_disks
- mddev
->delta_disks
;
4220 rdev_for_each(rdev
, mddev
) {
4222 rdev
->data_offset
< rdev
->new_data_offset
)
4225 rdev
->data_offset
> rdev
->new_data_offset
)
4229 mddev
->delta_disks
= n
- olddisks
;
4230 mddev
->raid_disks
= n
;
4231 mddev
->reshape_backwards
= (mddev
->delta_disks
< 0);
4233 mddev
->raid_disks
= n
;
4235 mddev_unlock(mddev
);
4236 return err
? err
: len
;
4238 static struct md_sysfs_entry md_raid_disks
=
4239 __ATTR(raid_disks
, S_IRUGO
|S_IWUSR
, raid_disks_show
, raid_disks_store
);
4242 uuid_show(struct mddev
*mddev
, char *page
)
4244 return sprintf(page
, "%pU\n", mddev
->uuid
);
4246 static struct md_sysfs_entry md_uuid
=
4247 __ATTR(uuid
, S_IRUGO
, uuid_show
, NULL
);
4250 chunk_size_show(struct mddev
*mddev
, char *page
)
4252 if (mddev
->reshape_position
!= MaxSector
&&
4253 mddev
->chunk_sectors
!= mddev
->new_chunk_sectors
)
4254 return sprintf(page
, "%d (%d)\n",
4255 mddev
->new_chunk_sectors
<< 9,
4256 mddev
->chunk_sectors
<< 9);
4257 return sprintf(page
, "%d\n", mddev
->chunk_sectors
<< 9);
4261 chunk_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4266 err
= kstrtoul(buf
, 10, &n
);
4270 err
= mddev_lock(mddev
);
4274 if (mddev
->pers
->check_reshape
== NULL
)
4279 mddev
->new_chunk_sectors
= n
>> 9;
4280 err
= mddev
->pers
->check_reshape(mddev
);
4282 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
4285 mddev
->new_chunk_sectors
= n
>> 9;
4286 if (mddev
->reshape_position
== MaxSector
)
4287 mddev
->chunk_sectors
= n
>> 9;
4289 mddev_unlock(mddev
);
4292 static struct md_sysfs_entry md_chunk_size
=
4293 __ATTR(chunk_size
, S_IRUGO
|S_IWUSR
, chunk_size_show
, chunk_size_store
);
4296 resync_start_show(struct mddev
*mddev
, char *page
)
4298 if (mddev
->recovery_cp
== MaxSector
)
4299 return sprintf(page
, "none\n");
4300 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->recovery_cp
);
4304 resync_start_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4306 unsigned long long n
;
4309 if (cmd_match(buf
, "none"))
4312 err
= kstrtoull(buf
, 10, &n
);
4315 if (n
!= (sector_t
)n
)
4319 err
= mddev_lock(mddev
);
4322 if (mddev
->pers
&& !test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
4326 mddev
->recovery_cp
= n
;
4328 set_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
4330 mddev_unlock(mddev
);
4333 static struct md_sysfs_entry md_resync_start
=
4334 __ATTR_PREALLOC(resync_start
, S_IRUGO
|S_IWUSR
,
4335 resync_start_show
, resync_start_store
);
4338 * The array state can be:
4341 * No devices, no size, no level
4342 * Equivalent to STOP_ARRAY ioctl
4344 * May have some settings, but array is not active
4345 * all IO results in error
4346 * When written, doesn't tear down array, but just stops it
4347 * suspended (not supported yet)
4348 * All IO requests will block. The array can be reconfigured.
4349 * Writing this, if accepted, will block until array is quiescent
4351 * no resync can happen. no superblocks get written.
4352 * write requests fail
4354 * like readonly, but behaves like 'clean' on a write request.
4356 * clean - no pending writes, but otherwise active.
4357 * When written to inactive array, starts without resync
4358 * If a write request arrives then
4359 * if metadata is known, mark 'dirty' and switch to 'active'.
4360 * if not known, block and switch to write-pending
4361 * If written to an active array that has pending writes, then fails.
4363 * fully active: IO and resync can be happening.
4364 * When written to inactive array, starts with resync
4367 * clean, but writes are blocked waiting for 'active' to be written.
4370 * like active, but no writes have been seen for a while (100msec).
4373 * RAID0/LINEAR-only: same as clean, but array is missing a member.
4374 * It's useful because RAID0/LINEAR mounted-arrays aren't stopped
4375 * when a member is gone, so this state will at least alert the
4376 * user that something is wrong.
4378 enum array_state
{ clear
, inactive
, suspended
, readonly
, read_auto
, clean
, active
,
4379 write_pending
, active_idle
, broken
, bad_word
};
4380 static char *array_states
[] = {
4381 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
4382 "write-pending", "active-idle", "broken", NULL
};
4384 static int match_word(const char *word
, char **list
)
4387 for (n
=0; list
[n
]; n
++)
4388 if (cmd_match(word
, list
[n
]))
4394 array_state_show(struct mddev
*mddev
, char *page
)
4396 enum array_state st
= inactive
;
4398 if (mddev
->pers
&& !test_bit(MD_NOT_READY
, &mddev
->flags
)) {
4407 spin_lock(&mddev
->lock
);
4408 if (test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
))
4410 else if (mddev
->in_sync
)
4412 else if (mddev
->safemode
)
4416 spin_unlock(&mddev
->lock
);
4419 if (test_bit(MD_BROKEN
, &mddev
->flags
) && st
== clean
)
4422 if (list_empty(&mddev
->disks
) &&
4423 mddev
->raid_disks
== 0 &&
4424 mddev
->dev_sectors
== 0)
4429 return sprintf(page
, "%s\n", array_states
[st
]);
4432 static int do_md_stop(struct mddev
*mddev
, int ro
, struct block_device
*bdev
);
4433 static int md_set_readonly(struct mddev
*mddev
, struct block_device
*bdev
);
4434 static int restart_array(struct mddev
*mddev
);
4437 array_state_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4440 enum array_state st
= match_word(buf
, array_states
);
4442 if (mddev
->pers
&& (st
== active
|| st
== clean
) && mddev
->ro
!= 1) {
4443 /* don't take reconfig_mutex when toggling between
4446 spin_lock(&mddev
->lock
);
4448 restart_array(mddev
);
4449 clear_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
4450 md_wakeup_thread(mddev
->thread
);
4451 wake_up(&mddev
->sb_wait
);
4452 } else /* st == clean */ {
4453 restart_array(mddev
);
4454 if (!set_in_sync(mddev
))
4458 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4459 spin_unlock(&mddev
->lock
);
4462 err
= mddev_lock(mddev
);
4470 /* stopping an active array */
4471 err
= do_md_stop(mddev
, 0, NULL
);
4474 /* stopping an active array */
4476 err
= do_md_stop(mddev
, 2, NULL
);
4478 err
= 0; /* already inactive */
4481 break; /* not supported yet */
4484 err
= md_set_readonly(mddev
, NULL
);
4487 set_disk_ro(mddev
->gendisk
, 1);
4488 err
= do_md_run(mddev
);
4494 err
= md_set_readonly(mddev
, NULL
);
4495 else if (mddev
->ro
== 1)
4496 err
= restart_array(mddev
);
4499 set_disk_ro(mddev
->gendisk
, 0);
4503 err
= do_md_run(mddev
);
4508 err
= restart_array(mddev
);
4511 spin_lock(&mddev
->lock
);
4512 if (!set_in_sync(mddev
))
4514 spin_unlock(&mddev
->lock
);
4520 err
= restart_array(mddev
);
4523 clear_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
4524 wake_up(&mddev
->sb_wait
);
4528 set_disk_ro(mddev
->gendisk
, 0);
4529 err
= do_md_run(mddev
);
4535 /* these cannot be set */
4540 if (mddev
->hold_active
== UNTIL_IOCTL
)
4541 mddev
->hold_active
= 0;
4542 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4544 mddev_unlock(mddev
);
4547 static struct md_sysfs_entry md_array_state
=
4548 __ATTR_PREALLOC(array_state
, S_IRUGO
|S_IWUSR
, array_state_show
, array_state_store
);
4551 max_corrected_read_errors_show(struct mddev
*mddev
, char *page
) {
4552 return sprintf(page
, "%d\n",
4553 atomic_read(&mddev
->max_corr_read_errors
));
4557 max_corrected_read_errors_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4562 rv
= kstrtouint(buf
, 10, &n
);
4565 atomic_set(&mddev
->max_corr_read_errors
, n
);
4569 static struct md_sysfs_entry max_corr_read_errors
=
4570 __ATTR(max_read_errors
, S_IRUGO
|S_IWUSR
, max_corrected_read_errors_show
,
4571 max_corrected_read_errors_store
);
4574 null_show(struct mddev
*mddev
, char *page
)
4579 /* need to ensure rdev_delayed_delete() has completed */
4580 static void flush_rdev_wq(struct mddev
*mddev
)
4582 struct md_rdev
*rdev
;
4585 rdev_for_each_rcu(rdev
, mddev
)
4586 if (work_pending(&rdev
->del_work
)) {
4587 flush_workqueue(md_rdev_misc_wq
);
4594 new_dev_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4596 /* buf must be %d:%d\n? giving major and minor numbers */
4597 /* The new device is added to the array.
4598 * If the array has a persistent superblock, we read the
4599 * superblock to initialise info and check validity.
4600 * Otherwise, only checking done is that in bind_rdev_to_array,
4601 * which mainly checks size.
4604 int major
= simple_strtoul(buf
, &e
, 10);
4607 struct md_rdev
*rdev
;
4610 if (!*buf
|| *e
!= ':' || !e
[1] || e
[1] == '\n')
4612 minor
= simple_strtoul(e
+1, &e
, 10);
4613 if (*e
&& *e
!= '\n')
4615 dev
= MKDEV(major
, minor
);
4616 if (major
!= MAJOR(dev
) ||
4617 minor
!= MINOR(dev
))
4620 flush_rdev_wq(mddev
);
4621 err
= mddev_lock(mddev
);
4624 if (mddev
->persistent
) {
4625 rdev
= md_import_device(dev
, mddev
->major_version
,
4626 mddev
->minor_version
);
4627 if (!IS_ERR(rdev
) && !list_empty(&mddev
->disks
)) {
4628 struct md_rdev
*rdev0
4629 = list_entry(mddev
->disks
.next
,
4630 struct md_rdev
, same_set
);
4631 err
= super_types
[mddev
->major_version
]
4632 .load_super(rdev
, rdev0
, mddev
->minor_version
);
4636 } else if (mddev
->external
)
4637 rdev
= md_import_device(dev
, -2, -1);
4639 rdev
= md_import_device(dev
, -1, -1);
4642 mddev_unlock(mddev
);
4643 return PTR_ERR(rdev
);
4645 err
= bind_rdev_to_array(rdev
, mddev
);
4649 mddev_unlock(mddev
);
4651 md_new_event(mddev
);
4652 return err
? err
: len
;
4655 static struct md_sysfs_entry md_new_device
=
4656 __ATTR(new_dev
, S_IWUSR
, null_show
, new_dev_store
);
4659 bitmap_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4662 unsigned long chunk
, end_chunk
;
4665 err
= mddev_lock(mddev
);
4670 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
4672 chunk
= end_chunk
= simple_strtoul(buf
, &end
, 0);
4673 if (buf
== end
) break;
4674 if (*end
== '-') { /* range */
4676 end_chunk
= simple_strtoul(buf
, &end
, 0);
4677 if (buf
== end
) break;
4679 if (*end
&& !isspace(*end
)) break;
4680 md_bitmap_dirty_bits(mddev
->bitmap
, chunk
, end_chunk
);
4681 buf
= skip_spaces(end
);
4683 md_bitmap_unplug(mddev
->bitmap
); /* flush the bits to disk */
4685 mddev_unlock(mddev
);
4689 static struct md_sysfs_entry md_bitmap
=
4690 __ATTR(bitmap_set_bits
, S_IWUSR
, null_show
, bitmap_store
);
4693 size_show(struct mddev
*mddev
, char *page
)
4695 return sprintf(page
, "%llu\n",
4696 (unsigned long long)mddev
->dev_sectors
/ 2);
4699 static int update_size(struct mddev
*mddev
, sector_t num_sectors
);
4702 size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4704 /* If array is inactive, we can reduce the component size, but
4705 * not increase it (except from 0).
4706 * If array is active, we can try an on-line resize
4709 int err
= strict_blocks_to_sectors(buf
, §ors
);
4713 err
= mddev_lock(mddev
);
4717 err
= update_size(mddev
, sectors
);
4719 md_update_sb(mddev
, 1);
4721 if (mddev
->dev_sectors
== 0 ||
4722 mddev
->dev_sectors
> sectors
)
4723 mddev
->dev_sectors
= sectors
;
4727 mddev_unlock(mddev
);
4728 return err
? err
: len
;
4731 static struct md_sysfs_entry md_size
=
4732 __ATTR(component_size
, S_IRUGO
|S_IWUSR
, size_show
, size_store
);
4734 /* Metadata version.
4736 * 'none' for arrays with no metadata (good luck...)
4737 * 'external' for arrays with externally managed metadata,
4738 * or N.M for internally known formats
4741 metadata_show(struct mddev
*mddev
, char *page
)
4743 if (mddev
->persistent
)
4744 return sprintf(page
, "%d.%d\n",
4745 mddev
->major_version
, mddev
->minor_version
);
4746 else if (mddev
->external
)
4747 return sprintf(page
, "external:%s\n", mddev
->metadata_type
);
4749 return sprintf(page
, "none\n");
4753 metadata_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4758 /* Changing the details of 'external' metadata is
4759 * always permitted. Otherwise there must be
4760 * no devices attached to the array.
4763 err
= mddev_lock(mddev
);
4767 if (mddev
->external
&& strncmp(buf
, "external:", 9) == 0)
4769 else if (!list_empty(&mddev
->disks
))
4773 if (cmd_match(buf
, "none")) {
4774 mddev
->persistent
= 0;
4775 mddev
->external
= 0;
4776 mddev
->major_version
= 0;
4777 mddev
->minor_version
= 90;
4780 if (strncmp(buf
, "external:", 9) == 0) {
4781 size_t namelen
= len
-9;
4782 if (namelen
>= sizeof(mddev
->metadata_type
))
4783 namelen
= sizeof(mddev
->metadata_type
)-1;
4784 strncpy(mddev
->metadata_type
, buf
+9, namelen
);
4785 mddev
->metadata_type
[namelen
] = 0;
4786 if (namelen
&& mddev
->metadata_type
[namelen
-1] == '\n')
4787 mddev
->metadata_type
[--namelen
] = 0;
4788 mddev
->persistent
= 0;
4789 mddev
->external
= 1;
4790 mddev
->major_version
= 0;
4791 mddev
->minor_version
= 90;
4794 major
= simple_strtoul(buf
, &e
, 10);
4796 if (e
==buf
|| *e
!= '.')
4799 minor
= simple_strtoul(buf
, &e
, 10);
4800 if (e
==buf
|| (*e
&& *e
!= '\n') )
4803 if (major
>= ARRAY_SIZE(super_types
) || super_types
[major
].name
== NULL
)
4805 mddev
->major_version
= major
;
4806 mddev
->minor_version
= minor
;
4807 mddev
->persistent
= 1;
4808 mddev
->external
= 0;
4811 mddev_unlock(mddev
);
4815 static struct md_sysfs_entry md_metadata
=
4816 __ATTR_PREALLOC(metadata_version
, S_IRUGO
|S_IWUSR
, metadata_show
, metadata_store
);
4819 action_show(struct mddev
*mddev
, char *page
)
4821 char *type
= "idle";
4822 unsigned long recovery
= mddev
->recovery
;
4823 if (test_bit(MD_RECOVERY_FROZEN
, &recovery
))
4825 else if (test_bit(MD_RECOVERY_RUNNING
, &recovery
) ||
4826 (!mddev
->ro
&& test_bit(MD_RECOVERY_NEEDED
, &recovery
))) {
4827 if (test_bit(MD_RECOVERY_RESHAPE
, &recovery
))
4829 else if (test_bit(MD_RECOVERY_SYNC
, &recovery
)) {
4830 if (!test_bit(MD_RECOVERY_REQUESTED
, &recovery
))
4832 else if (test_bit(MD_RECOVERY_CHECK
, &recovery
))
4836 } else if (test_bit(MD_RECOVERY_RECOVER
, &recovery
))
4838 else if (mddev
->reshape_position
!= MaxSector
)
4841 return sprintf(page
, "%s\n", type
);
4845 action_store(struct mddev
*mddev
, const char *page
, size_t len
)
4847 if (!mddev
->pers
|| !mddev
->pers
->sync_request
)
4851 if (cmd_match(page
, "idle") || cmd_match(page
, "frozen")) {
4852 if (cmd_match(page
, "frozen"))
4853 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4855 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4856 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
4857 mddev_lock(mddev
) == 0) {
4858 if (work_pending(&mddev
->del_work
))
4859 flush_workqueue(md_misc_wq
);
4860 if (mddev
->sync_thread
) {
4861 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4862 md_reap_sync_thread(mddev
);
4864 mddev_unlock(mddev
);
4866 } else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4868 else if (cmd_match(page
, "resync"))
4869 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4870 else if (cmd_match(page
, "recover")) {
4871 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4872 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
4873 } else if (cmd_match(page
, "reshape")) {
4875 if (mddev
->pers
->start_reshape
== NULL
)
4877 err
= mddev_lock(mddev
);
4879 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4882 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4883 err
= mddev
->pers
->start_reshape(mddev
);
4885 mddev_unlock(mddev
);
4889 sysfs_notify_dirent_safe(mddev
->sysfs_degraded
);
4891 if (cmd_match(page
, "check"))
4892 set_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
4893 else if (!cmd_match(page
, "repair"))
4895 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4896 set_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
4897 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
4899 if (mddev
->ro
== 2) {
4900 /* A write to sync_action is enough to justify
4901 * canceling read-auto mode
4904 md_wakeup_thread(mddev
->sync_thread
);
4906 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4907 md_wakeup_thread(mddev
->thread
);
4908 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
4912 static struct md_sysfs_entry md_scan_mode
=
4913 __ATTR_PREALLOC(sync_action
, S_IRUGO
|S_IWUSR
, action_show
, action_store
);
4916 last_sync_action_show(struct mddev
*mddev
, char *page
)
4918 return sprintf(page
, "%s\n", mddev
->last_sync_action
);
4921 static struct md_sysfs_entry md_last_scan_mode
= __ATTR_RO(last_sync_action
);
4924 mismatch_cnt_show(struct mddev
*mddev
, char *page
)
4926 return sprintf(page
, "%llu\n",
4927 (unsigned long long)
4928 atomic64_read(&mddev
->resync_mismatches
));
4931 static struct md_sysfs_entry md_mismatches
= __ATTR_RO(mismatch_cnt
);
4934 sync_min_show(struct mddev
*mddev
, char *page
)
4936 return sprintf(page
, "%d (%s)\n", speed_min(mddev
),
4937 mddev
->sync_speed_min
? "local": "system");
4941 sync_min_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4946 if (strncmp(buf
, "system", 6)==0) {
4949 rv
= kstrtouint(buf
, 10, &min
);
4955 mddev
->sync_speed_min
= min
;
4959 static struct md_sysfs_entry md_sync_min
=
4960 __ATTR(sync_speed_min
, S_IRUGO
|S_IWUSR
, sync_min_show
, sync_min_store
);
4963 sync_max_show(struct mddev
*mddev
, char *page
)
4965 return sprintf(page
, "%d (%s)\n", speed_max(mddev
),
4966 mddev
->sync_speed_max
? "local": "system");
4970 sync_max_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4975 if (strncmp(buf
, "system", 6)==0) {
4978 rv
= kstrtouint(buf
, 10, &max
);
4984 mddev
->sync_speed_max
= max
;
4988 static struct md_sysfs_entry md_sync_max
=
4989 __ATTR(sync_speed_max
, S_IRUGO
|S_IWUSR
, sync_max_show
, sync_max_store
);
4992 degraded_show(struct mddev
*mddev
, char *page
)
4994 return sprintf(page
, "%d\n", mddev
->degraded
);
4996 static struct md_sysfs_entry md_degraded
= __ATTR_RO(degraded
);
4999 sync_force_parallel_show(struct mddev
*mddev
, char *page
)
5001 return sprintf(page
, "%d\n", mddev
->parallel_resync
);
5005 sync_force_parallel_store(struct mddev
*mddev
, const char *buf
, size_t len
)
5009 if (kstrtol(buf
, 10, &n
))
5012 if (n
!= 0 && n
!= 1)
5015 mddev
->parallel_resync
= n
;
5017 if (mddev
->sync_thread
)
5018 wake_up(&resync_wait
);
5023 /* force parallel resync, even with shared block devices */
5024 static struct md_sysfs_entry md_sync_force_parallel
=
5025 __ATTR(sync_force_parallel
, S_IRUGO
|S_IWUSR
,
5026 sync_force_parallel_show
, sync_force_parallel_store
);
5029 sync_speed_show(struct mddev
*mddev
, char *page
)
5031 unsigned long resync
, dt
, db
;
5032 if (mddev
->curr_resync
== 0)
5033 return sprintf(page
, "none\n");
5034 resync
= mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
);
5035 dt
= (jiffies
- mddev
->resync_mark
) / HZ
;
5037 db
= resync
- mddev
->resync_mark_cnt
;
5038 return sprintf(page
, "%lu\n", db
/dt
/2); /* K/sec */
5041 static struct md_sysfs_entry md_sync_speed
= __ATTR_RO(sync_speed
);
5044 sync_completed_show(struct mddev
*mddev
, char *page
)
5046 unsigned long long max_sectors
, resync
;
5048 if (!test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
5049 return sprintf(page
, "none\n");
5051 if (mddev
->curr_resync
== 1 ||
5052 mddev
->curr_resync
== 2)
5053 return sprintf(page
, "delayed\n");
5055 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
5056 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
5057 max_sectors
= mddev
->resync_max_sectors
;
5059 max_sectors
= mddev
->dev_sectors
;
5061 resync
= mddev
->curr_resync_completed
;
5062 return sprintf(page
, "%llu / %llu\n", resync
, max_sectors
);
5065 static struct md_sysfs_entry md_sync_completed
=
5066 __ATTR_PREALLOC(sync_completed
, S_IRUGO
, sync_completed_show
, NULL
);
5069 min_sync_show(struct mddev
*mddev
, char *page
)
5071 return sprintf(page
, "%llu\n",
5072 (unsigned long long)mddev
->resync_min
);
5075 min_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
5077 unsigned long long min
;
5080 if (kstrtoull(buf
, 10, &min
))
5083 spin_lock(&mddev
->lock
);
5085 if (min
> mddev
->resync_max
)
5089 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
5092 /* Round down to multiple of 4K for safety */
5093 mddev
->resync_min
= round_down(min
, 8);
5097 spin_unlock(&mddev
->lock
);
5101 static struct md_sysfs_entry md_min_sync
=
5102 __ATTR(sync_min
, S_IRUGO
|S_IWUSR
, min_sync_show
, min_sync_store
);
5105 max_sync_show(struct mddev
*mddev
, char *page
)
5107 if (mddev
->resync_max
== MaxSector
)
5108 return sprintf(page
, "max\n");
5110 return sprintf(page
, "%llu\n",
5111 (unsigned long long)mddev
->resync_max
);
5114 max_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
5117 spin_lock(&mddev
->lock
);
5118 if (strncmp(buf
, "max", 3) == 0)
5119 mddev
->resync_max
= MaxSector
;
5121 unsigned long long max
;
5125 if (kstrtoull(buf
, 10, &max
))
5127 if (max
< mddev
->resync_min
)
5131 if (max
< mddev
->resync_max
&&
5133 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
5136 /* Must be a multiple of chunk_size */
5137 chunk
= mddev
->chunk_sectors
;
5139 sector_t temp
= max
;
5142 if (sector_div(temp
, chunk
))
5145 mddev
->resync_max
= max
;
5147 wake_up(&mddev
->recovery_wait
);
5150 spin_unlock(&mddev
->lock
);
5154 static struct md_sysfs_entry md_max_sync
=
5155 __ATTR(sync_max
, S_IRUGO
|S_IWUSR
, max_sync_show
, max_sync_store
);
5158 suspend_lo_show(struct mddev
*mddev
, char *page
)
5160 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_lo
);
5164 suspend_lo_store(struct mddev
*mddev
, const char *buf
, size_t len
)
5166 unsigned long long new;
5169 err
= kstrtoull(buf
, 10, &new);
5172 if (new != (sector_t
)new)
5175 err
= mddev_lock(mddev
);
5179 if (mddev
->pers
== NULL
||
5180 mddev
->pers
->quiesce
== NULL
)
5182 mddev_suspend(mddev
);
5183 mddev
->suspend_lo
= new;
5184 mddev_resume(mddev
);
5188 mddev_unlock(mddev
);
5191 static struct md_sysfs_entry md_suspend_lo
=
5192 __ATTR(suspend_lo
, S_IRUGO
|S_IWUSR
, suspend_lo_show
, suspend_lo_store
);
5195 suspend_hi_show(struct mddev
*mddev
, char *page
)
5197 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_hi
);
5201 suspend_hi_store(struct mddev
*mddev
, const char *buf
, size_t len
)
5203 unsigned long long new;
5206 err
= kstrtoull(buf
, 10, &new);
5209 if (new != (sector_t
)new)
5212 err
= mddev_lock(mddev
);
5216 if (mddev
->pers
== NULL
)
5219 mddev_suspend(mddev
);
5220 mddev
->suspend_hi
= new;
5221 mddev_resume(mddev
);
5225 mddev_unlock(mddev
);
5228 static struct md_sysfs_entry md_suspend_hi
=
5229 __ATTR(suspend_hi
, S_IRUGO
|S_IWUSR
, suspend_hi_show
, suspend_hi_store
);
5232 reshape_position_show(struct mddev
*mddev
, char *page
)
5234 if (mddev
->reshape_position
!= MaxSector
)
5235 return sprintf(page
, "%llu\n",
5236 (unsigned long long)mddev
->reshape_position
);
5237 strcpy(page
, "none\n");
5242 reshape_position_store(struct mddev
*mddev
, const char *buf
, size_t len
)
5244 struct md_rdev
*rdev
;
5245 unsigned long long new;
5248 err
= kstrtoull(buf
, 10, &new);
5251 if (new != (sector_t
)new)
5253 err
= mddev_lock(mddev
);
5259 mddev
->reshape_position
= new;
5260 mddev
->delta_disks
= 0;
5261 mddev
->reshape_backwards
= 0;
5262 mddev
->new_level
= mddev
->level
;
5263 mddev
->new_layout
= mddev
->layout
;
5264 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
5265 rdev_for_each(rdev
, mddev
)
5266 rdev
->new_data_offset
= rdev
->data_offset
;
5269 mddev_unlock(mddev
);
5273 static struct md_sysfs_entry md_reshape_position
=
5274 __ATTR(reshape_position
, S_IRUGO
|S_IWUSR
, reshape_position_show
,
5275 reshape_position_store
);
5278 reshape_direction_show(struct mddev
*mddev
, char *page
)
5280 return sprintf(page
, "%s\n",
5281 mddev
->reshape_backwards
? "backwards" : "forwards");
5285 reshape_direction_store(struct mddev
*mddev
, const char *buf
, size_t len
)
5290 if (cmd_match(buf
, "forwards"))
5292 else if (cmd_match(buf
, "backwards"))
5296 if (mddev
->reshape_backwards
== backwards
)
5299 err
= mddev_lock(mddev
);
5302 /* check if we are allowed to change */
5303 if (mddev
->delta_disks
)
5305 else if (mddev
->persistent
&&
5306 mddev
->major_version
== 0)
5309 mddev
->reshape_backwards
= backwards
;
5310 mddev_unlock(mddev
);
5314 static struct md_sysfs_entry md_reshape_direction
=
5315 __ATTR(reshape_direction
, S_IRUGO
|S_IWUSR
, reshape_direction_show
,
5316 reshape_direction_store
);
5319 array_size_show(struct mddev
*mddev
, char *page
)
5321 if (mddev
->external_size
)
5322 return sprintf(page
, "%llu\n",
5323 (unsigned long long)mddev
->array_sectors
/2);
5325 return sprintf(page
, "default\n");
5329 array_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
5334 err
= mddev_lock(mddev
);
5338 /* cluster raid doesn't support change array_sectors */
5339 if (mddev_is_clustered(mddev
)) {
5340 mddev_unlock(mddev
);
5344 if (strncmp(buf
, "default", 7) == 0) {
5346 sectors
= mddev
->pers
->size(mddev
, 0, 0);
5348 sectors
= mddev
->array_sectors
;
5350 mddev
->external_size
= 0;
5352 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
5354 else if (mddev
->pers
&& mddev
->pers
->size(mddev
, 0, 0) < sectors
)
5357 mddev
->external_size
= 1;
5361 mddev
->array_sectors
= sectors
;
5363 set_capacity_and_notify(mddev
->gendisk
,
5364 mddev
->array_sectors
);
5366 mddev_unlock(mddev
);
5370 static struct md_sysfs_entry md_array_size
=
5371 __ATTR(array_size
, S_IRUGO
|S_IWUSR
, array_size_show
,
5375 consistency_policy_show(struct mddev
*mddev
, char *page
)
5379 if (test_bit(MD_HAS_JOURNAL
, &mddev
->flags
)) {
5380 ret
= sprintf(page
, "journal\n");
5381 } else if (test_bit(MD_HAS_PPL
, &mddev
->flags
)) {
5382 ret
= sprintf(page
, "ppl\n");
5383 } else if (mddev
->bitmap
) {
5384 ret
= sprintf(page
, "bitmap\n");
5385 } else if (mddev
->pers
) {
5386 if (mddev
->pers
->sync_request
)
5387 ret
= sprintf(page
, "resync\n");
5389 ret
= sprintf(page
, "none\n");
5391 ret
= sprintf(page
, "unknown\n");
5398 consistency_policy_store(struct mddev
*mddev
, const char *buf
, size_t len
)
5403 if (mddev
->pers
->change_consistency_policy
)
5404 err
= mddev
->pers
->change_consistency_policy(mddev
, buf
);
5407 } else if (mddev
->external
&& strncmp(buf
, "ppl", 3) == 0) {
5408 set_bit(MD_HAS_PPL
, &mddev
->flags
);
5413 return err
? err
: len
;
5416 static struct md_sysfs_entry md_consistency_policy
=
5417 __ATTR(consistency_policy
, S_IRUGO
| S_IWUSR
, consistency_policy_show
,
5418 consistency_policy_store
);
5420 static ssize_t
fail_last_dev_show(struct mddev
*mddev
, char *page
)
5422 return sprintf(page
, "%d\n", mddev
->fail_last_dev
);
5426 * Setting fail_last_dev to true to allow last device to be forcibly removed
5427 * from RAID1/RAID10.
5430 fail_last_dev_store(struct mddev
*mddev
, const char *buf
, size_t len
)
5435 ret
= kstrtobool(buf
, &value
);
5439 if (value
!= mddev
->fail_last_dev
)
5440 mddev
->fail_last_dev
= value
;
5444 static struct md_sysfs_entry md_fail_last_dev
=
5445 __ATTR(fail_last_dev
, S_IRUGO
| S_IWUSR
, fail_last_dev_show
,
5446 fail_last_dev_store
);
5448 static ssize_t
serialize_policy_show(struct mddev
*mddev
, char *page
)
5450 if (mddev
->pers
== NULL
|| (mddev
->pers
->level
!= 1))
5451 return sprintf(page
, "n/a\n");
5453 return sprintf(page
, "%d\n", mddev
->serialize_policy
);
5457 * Setting serialize_policy to true to enforce write IO is not reordered
5461 serialize_policy_store(struct mddev
*mddev
, const char *buf
, size_t len
)
5466 err
= kstrtobool(buf
, &value
);
5470 if (value
== mddev
->serialize_policy
)
5473 err
= mddev_lock(mddev
);
5476 if (mddev
->pers
== NULL
|| (mddev
->pers
->level
!= 1)) {
5477 pr_err("md: serialize_policy is only effective for raid1\n");
5482 mddev_suspend(mddev
);
5484 mddev_create_serial_pool(mddev
, NULL
, true);
5486 mddev_destroy_serial_pool(mddev
, NULL
, true);
5487 mddev
->serialize_policy
= value
;
5488 mddev_resume(mddev
);
5490 mddev_unlock(mddev
);
5494 static struct md_sysfs_entry md_serialize_policy
=
5495 __ATTR(serialize_policy
, S_IRUGO
| S_IWUSR
, serialize_policy_show
,
5496 serialize_policy_store
);
5499 static struct attribute
*md_default_attrs
[] = {
5502 &md_raid_disks
.attr
,
5504 &md_chunk_size
.attr
,
5506 &md_resync_start
.attr
,
5508 &md_new_device
.attr
,
5509 &md_safe_delay
.attr
,
5510 &md_array_state
.attr
,
5511 &md_reshape_position
.attr
,
5512 &md_reshape_direction
.attr
,
5513 &md_array_size
.attr
,
5514 &max_corr_read_errors
.attr
,
5515 &md_consistency_policy
.attr
,
5516 &md_fail_last_dev
.attr
,
5517 &md_serialize_policy
.attr
,
5521 static struct attribute
*md_redundancy_attrs
[] = {
5523 &md_last_scan_mode
.attr
,
5524 &md_mismatches
.attr
,
5527 &md_sync_speed
.attr
,
5528 &md_sync_force_parallel
.attr
,
5529 &md_sync_completed
.attr
,
5532 &md_suspend_lo
.attr
,
5533 &md_suspend_hi
.attr
,
5538 static struct attribute_group md_redundancy_group
= {
5540 .attrs
= md_redundancy_attrs
,
5544 md_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
5546 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
5547 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
5552 spin_lock(&all_mddevs_lock
);
5553 if (list_empty(&mddev
->all_mddevs
)) {
5554 spin_unlock(&all_mddevs_lock
);
5558 spin_unlock(&all_mddevs_lock
);
5560 rv
= entry
->show(mddev
, page
);
5566 md_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
5567 const char *page
, size_t length
)
5569 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
5570 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
5575 if (!capable(CAP_SYS_ADMIN
))
5577 spin_lock(&all_mddevs_lock
);
5578 if (list_empty(&mddev
->all_mddevs
)) {
5579 spin_unlock(&all_mddevs_lock
);
5583 spin_unlock(&all_mddevs_lock
);
5584 rv
= entry
->store(mddev
, page
, length
);
5589 static void md_free(struct kobject
*ko
)
5591 struct mddev
*mddev
= container_of(ko
, struct mddev
, kobj
);
5593 if (mddev
->sysfs_state
)
5594 sysfs_put(mddev
->sysfs_state
);
5595 if (mddev
->sysfs_level
)
5596 sysfs_put(mddev
->sysfs_level
);
5599 del_gendisk(mddev
->gendisk
);
5601 blk_cleanup_queue(mddev
->queue
);
5603 put_disk(mddev
->gendisk
);
5604 percpu_ref_exit(&mddev
->writes_pending
);
5606 bioset_exit(&mddev
->bio_set
);
5607 bioset_exit(&mddev
->sync_set
);
5608 mempool_exit(&mddev
->md_io_pool
);
5612 static const struct sysfs_ops md_sysfs_ops
= {
5613 .show
= md_attr_show
,
5614 .store
= md_attr_store
,
5616 static struct kobj_type md_ktype
= {
5618 .sysfs_ops
= &md_sysfs_ops
,
5619 .default_attrs
= md_default_attrs
,
5624 static void mddev_delayed_delete(struct work_struct
*ws
)
5626 struct mddev
*mddev
= container_of(ws
, struct mddev
, del_work
);
5628 sysfs_remove_group(&mddev
->kobj
, &md_bitmap_group
);
5629 kobject_del(&mddev
->kobj
);
5630 kobject_put(&mddev
->kobj
);
5633 static void no_op(struct percpu_ref
*r
) {}
5635 int mddev_init_writes_pending(struct mddev
*mddev
)
5637 if (mddev
->writes_pending
.percpu_count_ptr
)
5639 if (percpu_ref_init(&mddev
->writes_pending
, no_op
,
5640 PERCPU_REF_ALLOW_REINIT
, GFP_KERNEL
) < 0)
5642 /* We want to start with the refcount at zero */
5643 percpu_ref_put(&mddev
->writes_pending
);
5646 EXPORT_SYMBOL_GPL(mddev_init_writes_pending
);
5648 static int md_alloc(dev_t dev
, char *name
)
5651 * If dev is zero, name is the name of a device to allocate with
5652 * an arbitrary minor number. It will be "md_???"
5653 * If dev is non-zero it must be a device number with a MAJOR of
5654 * MD_MAJOR or mdp_major. In this case, if "name" is NULL, then
5655 * the device is being created by opening a node in /dev.
5656 * If "name" is not NULL, the device is being created by
5657 * writing to /sys/module/md_mod/parameters/new_array.
5659 static DEFINE_MUTEX(disks_mutex
);
5660 struct mddev
*mddev
= mddev_find(dev
);
5661 struct gendisk
*disk
;
5670 partitioned
= (MAJOR(mddev
->unit
) != MD_MAJOR
);
5671 shift
= partitioned
? MdpMinorShift
: 0;
5672 unit
= MINOR(mddev
->unit
) >> shift
;
5674 /* wait for any previous instance of this device to be
5675 * completely removed (mddev_delayed_delete).
5677 flush_workqueue(md_misc_wq
);
5679 mutex_lock(&disks_mutex
);
5685 /* Need to ensure that 'name' is not a duplicate.
5687 struct mddev
*mddev2
;
5688 spin_lock(&all_mddevs_lock
);
5690 list_for_each_entry(mddev2
, &all_mddevs
, all_mddevs
)
5691 if (mddev2
->gendisk
&&
5692 strcmp(mddev2
->gendisk
->disk_name
, name
) == 0) {
5693 spin_unlock(&all_mddevs_lock
);
5696 spin_unlock(&all_mddevs_lock
);
5700 * Creating /dev/mdNNN via "newarray", so adjust hold_active.
5702 mddev
->hold_active
= UNTIL_STOP
;
5704 error
= mempool_init_kmalloc_pool(&mddev
->md_io_pool
, BIO_POOL_SIZE
,
5705 sizeof(struct md_io
));
5710 mddev
->queue
= blk_alloc_queue(NUMA_NO_NODE
);
5714 blk_set_stacking_limits(&mddev
->queue
->limits
);
5716 disk
= alloc_disk(1 << shift
);
5718 blk_cleanup_queue(mddev
->queue
);
5719 mddev
->queue
= NULL
;
5722 disk
->major
= MAJOR(mddev
->unit
);
5723 disk
->first_minor
= unit
<< shift
;
5725 strcpy(disk
->disk_name
, name
);
5726 else if (partitioned
)
5727 sprintf(disk
->disk_name
, "md_d%d", unit
);
5729 sprintf(disk
->disk_name
, "md%d", unit
);
5730 disk
->fops
= &md_fops
;
5731 disk
->private_data
= mddev
;
5732 disk
->queue
= mddev
->queue
;
5733 blk_queue_write_cache(mddev
->queue
, true, true);
5734 /* Allow extended partitions. This makes the
5735 * 'mdp' device redundant, but we can't really
5738 disk
->flags
|= GENHD_FL_EXT_DEVT
;
5739 disk
->events
|= DISK_EVENT_MEDIA_CHANGE
;
5740 mddev
->gendisk
= disk
;
5741 /* As soon as we call add_disk(), another thread could get
5742 * through to md_open, so make sure it doesn't get too far
5744 mutex_lock(&mddev
->open_mutex
);
5747 error
= kobject_add(&mddev
->kobj
, &disk_to_dev(disk
)->kobj
, "%s", "md");
5749 /* This isn't possible, but as kobject_init_and_add is marked
5750 * __must_check, we must do something with the result
5752 pr_debug("md: cannot register %s/md - name in use\n",
5756 if (mddev
->kobj
.sd
&&
5757 sysfs_create_group(&mddev
->kobj
, &md_bitmap_group
))
5758 pr_debug("pointless warning\n");
5759 mutex_unlock(&mddev
->open_mutex
);
5761 mutex_unlock(&disks_mutex
);
5762 if (!error
&& mddev
->kobj
.sd
) {
5763 kobject_uevent(&mddev
->kobj
, KOBJ_ADD
);
5764 mddev
->sysfs_state
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "array_state");
5765 mddev
->sysfs_level
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "level");
5771 static void md_probe(dev_t dev
)
5773 if (MAJOR(dev
) == MD_MAJOR
&& MINOR(dev
) >= 512)
5776 md_alloc(dev
, NULL
);
5779 static int add_named_array(const char *val
, const struct kernel_param
*kp
)
5782 * val must be "md_*" or "mdNNN".
5783 * For "md_*" we allocate an array with a large free minor number, and
5784 * set the name to val. val must not already be an active name.
5785 * For "mdNNN" we allocate an array with the minor number NNN
5786 * which must not already be in use.
5788 int len
= strlen(val
);
5789 char buf
[DISK_NAME_LEN
];
5790 unsigned long devnum
;
5792 while (len
&& val
[len
-1] == '\n')
5794 if (len
>= DISK_NAME_LEN
)
5796 strlcpy(buf
, val
, len
+1);
5797 if (strncmp(buf
, "md_", 3) == 0)
5798 return md_alloc(0, buf
);
5799 if (strncmp(buf
, "md", 2) == 0 &&
5801 kstrtoul(buf
+2, 10, &devnum
) == 0 &&
5802 devnum
<= MINORMASK
)
5803 return md_alloc(MKDEV(MD_MAJOR
, devnum
), NULL
);
5808 static void md_safemode_timeout(struct timer_list
*t
)
5810 struct mddev
*mddev
= from_timer(mddev
, t
, safemode_timer
);
5812 mddev
->safemode
= 1;
5813 if (mddev
->external
)
5814 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5816 md_wakeup_thread(mddev
->thread
);
5819 static int start_dirty_degraded
;
5821 int md_run(struct mddev
*mddev
)
5824 struct md_rdev
*rdev
;
5825 struct md_personality
*pers
;
5827 if (list_empty(&mddev
->disks
))
5828 /* cannot run an array with no devices.. */
5833 /* Cannot run until previous stop completes properly */
5834 if (mddev
->sysfs_active
)
5838 * Analyze all RAID superblock(s)
5840 if (!mddev
->raid_disks
) {
5841 if (!mddev
->persistent
)
5843 err
= analyze_sbs(mddev
);
5848 if (mddev
->level
!= LEVEL_NONE
)
5849 request_module("md-level-%d", mddev
->level
);
5850 else if (mddev
->clevel
[0])
5851 request_module("md-%s", mddev
->clevel
);
5854 * Drop all container device buffers, from now on
5855 * the only valid external interface is through the md
5858 mddev
->has_superblocks
= false;
5859 rdev_for_each(rdev
, mddev
) {
5860 if (test_bit(Faulty
, &rdev
->flags
))
5862 sync_blockdev(rdev
->bdev
);
5863 invalidate_bdev(rdev
->bdev
);
5864 if (mddev
->ro
!= 1 &&
5865 (bdev_read_only(rdev
->bdev
) ||
5866 bdev_read_only(rdev
->meta_bdev
))) {
5869 set_disk_ro(mddev
->gendisk
, 1);
5873 mddev
->has_superblocks
= true;
5875 /* perform some consistency tests on the device.
5876 * We don't want the data to overlap the metadata,
5877 * Internal Bitmap issues have been handled elsewhere.
5879 if (rdev
->meta_bdev
) {
5880 /* Nothing to check */;
5881 } else if (rdev
->data_offset
< rdev
->sb_start
) {
5882 if (mddev
->dev_sectors
&&
5883 rdev
->data_offset
+ mddev
->dev_sectors
5885 pr_warn("md: %s: data overlaps metadata\n",
5890 if (rdev
->sb_start
+ rdev
->sb_size
/512
5891 > rdev
->data_offset
) {
5892 pr_warn("md: %s: metadata overlaps data\n",
5897 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
5900 if (!bioset_initialized(&mddev
->bio_set
)) {
5901 err
= bioset_init(&mddev
->bio_set
, BIO_POOL_SIZE
, 0, BIOSET_NEED_BVECS
);
5905 if (!bioset_initialized(&mddev
->sync_set
)) {
5906 err
= bioset_init(&mddev
->sync_set
, BIO_POOL_SIZE
, 0, BIOSET_NEED_BVECS
);
5911 spin_lock(&pers_lock
);
5912 pers
= find_pers(mddev
->level
, mddev
->clevel
);
5913 if (!pers
|| !try_module_get(pers
->owner
)) {
5914 spin_unlock(&pers_lock
);
5915 if (mddev
->level
!= LEVEL_NONE
)
5916 pr_warn("md: personality for level %d is not loaded!\n",
5919 pr_warn("md: personality for level %s is not loaded!\n",
5924 spin_unlock(&pers_lock
);
5925 if (mddev
->level
!= pers
->level
) {
5926 mddev
->level
= pers
->level
;
5927 mddev
->new_level
= pers
->level
;
5929 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
5931 if (mddev
->reshape_position
!= MaxSector
&&
5932 pers
->start_reshape
== NULL
) {
5933 /* This personality cannot handle reshaping... */
5934 module_put(pers
->owner
);
5939 if (pers
->sync_request
) {
5940 /* Warn if this is a potentially silly
5943 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
5944 struct md_rdev
*rdev2
;
5947 rdev_for_each(rdev
, mddev
)
5948 rdev_for_each(rdev2
, mddev
) {
5950 rdev
->bdev
->bd_disk
==
5951 rdev2
->bdev
->bd_disk
) {
5952 pr_warn("%s: WARNING: %s appears to be on the same physical disk as %s.\n",
5954 bdevname(rdev
->bdev
,b
),
5955 bdevname(rdev2
->bdev
,b2
));
5961 pr_warn("True protection against single-disk failure might be compromised.\n");
5964 mddev
->recovery
= 0;
5965 /* may be over-ridden by personality */
5966 mddev
->resync_max_sectors
= mddev
->dev_sectors
;
5968 mddev
->ok_start_degraded
= start_dirty_degraded
;
5970 if (start_readonly
&& mddev
->ro
== 0)
5971 mddev
->ro
= 2; /* read-only, but switch on first write */
5973 err
= pers
->run(mddev
);
5975 pr_warn("md: pers->run() failed ...\n");
5976 else if (pers
->size(mddev
, 0, 0) < mddev
->array_sectors
) {
5977 WARN_ONCE(!mddev
->external_size
,
5978 "%s: default size too small, but 'external_size' not in effect?\n",
5980 pr_warn("md: invalid array_size %llu > default size %llu\n",
5981 (unsigned long long)mddev
->array_sectors
/ 2,
5982 (unsigned long long)pers
->size(mddev
, 0, 0) / 2);
5985 if (err
== 0 && pers
->sync_request
&&
5986 (mddev
->bitmap_info
.file
|| mddev
->bitmap_info
.offset
)) {
5987 struct bitmap
*bitmap
;
5989 bitmap
= md_bitmap_create(mddev
, -1);
5990 if (IS_ERR(bitmap
)) {
5991 err
= PTR_ERR(bitmap
);
5992 pr_warn("%s: failed to create bitmap (%d)\n",
5993 mdname(mddev
), err
);
5995 mddev
->bitmap
= bitmap
;
6001 if (mddev
->bitmap_info
.max_write_behind
> 0) {
6002 bool create_pool
= false;
6004 rdev_for_each(rdev
, mddev
) {
6005 if (test_bit(WriteMostly
, &rdev
->flags
) &&
6006 rdev_init_serial(rdev
))
6009 if (create_pool
&& mddev
->serial_info_pool
== NULL
) {
6010 mddev
->serial_info_pool
=
6011 mempool_create_kmalloc_pool(NR_SERIAL_INFOS
,
6012 sizeof(struct serial_info
));
6013 if (!mddev
->serial_info_pool
) {
6023 rdev_for_each(rdev
, mddev
) {
6024 if (rdev
->raid_disk
>= 0 &&
6025 !blk_queue_nonrot(bdev_get_queue(rdev
->bdev
))) {
6030 if (mddev
->degraded
)
6033 blk_queue_flag_set(QUEUE_FLAG_NONROT
, mddev
->queue
);
6035 blk_queue_flag_clear(QUEUE_FLAG_NONROT
, mddev
->queue
);
6037 if (pers
->sync_request
) {
6038 if (mddev
->kobj
.sd
&&
6039 sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
6040 pr_warn("md: cannot register extra attributes for %s\n",
6042 mddev
->sysfs_action
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "sync_action");
6043 mddev
->sysfs_completed
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "sync_completed");
6044 mddev
->sysfs_degraded
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "degraded");
6045 } else if (mddev
->ro
== 2) /* auto-readonly not meaningful */
6048 atomic_set(&mddev
->max_corr_read_errors
,
6049 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS
);
6050 mddev
->safemode
= 0;
6051 if (mddev_is_clustered(mddev
))
6052 mddev
->safemode_delay
= 0;
6054 mddev
->safemode_delay
= DEFAULT_SAFEMODE_DELAY
;
6057 spin_lock(&mddev
->lock
);
6059 spin_unlock(&mddev
->lock
);
6060 rdev_for_each(rdev
, mddev
)
6061 if (rdev
->raid_disk
>= 0)
6062 sysfs_link_rdev(mddev
, rdev
); /* failure here is OK */
6064 if (mddev
->degraded
&& !mddev
->ro
)
6065 /* This ensures that recovering status is reported immediately
6066 * via sysfs - until a lack of spares is confirmed.
6068 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
6069 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6071 if (mddev
->sb_flags
)
6072 md_update_sb(mddev
, 0);
6074 md_new_event(mddev
);
6078 mddev_detach(mddev
);
6080 pers
->free(mddev
, mddev
->private);
6081 mddev
->private = NULL
;
6082 module_put(pers
->owner
);
6083 md_bitmap_destroy(mddev
);
6085 bioset_exit(&mddev
->bio_set
);
6086 bioset_exit(&mddev
->sync_set
);
6089 EXPORT_SYMBOL_GPL(md_run
);
6091 int do_md_run(struct mddev
*mddev
)
6095 set_bit(MD_NOT_READY
, &mddev
->flags
);
6096 err
= md_run(mddev
);
6099 err
= md_bitmap_load(mddev
);
6101 md_bitmap_destroy(mddev
);
6105 if (mddev_is_clustered(mddev
))
6106 md_allow_write(mddev
);
6108 /* run start up tasks that require md_thread */
6111 md_wakeup_thread(mddev
->thread
);
6112 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
6114 set_capacity_and_notify(mddev
->gendisk
, mddev
->array_sectors
);
6115 clear_bit(MD_NOT_READY
, &mddev
->flags
);
6117 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
6118 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6119 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
6120 sysfs_notify_dirent_safe(mddev
->sysfs_degraded
);
6122 clear_bit(MD_NOT_READY
, &mddev
->flags
);
6126 int md_start(struct mddev
*mddev
)
6130 if (mddev
->pers
->start
) {
6131 set_bit(MD_RECOVERY_WAIT
, &mddev
->recovery
);
6132 md_wakeup_thread(mddev
->thread
);
6133 ret
= mddev
->pers
->start(mddev
);
6134 clear_bit(MD_RECOVERY_WAIT
, &mddev
->recovery
);
6135 md_wakeup_thread(mddev
->sync_thread
);
6139 EXPORT_SYMBOL_GPL(md_start
);
6141 static int restart_array(struct mddev
*mddev
)
6143 struct gendisk
*disk
= mddev
->gendisk
;
6144 struct md_rdev
*rdev
;
6145 bool has_journal
= false;
6146 bool has_readonly
= false;
6148 /* Complain if it has no devices */
6149 if (list_empty(&mddev
->disks
))
6157 rdev_for_each_rcu(rdev
, mddev
) {
6158 if (test_bit(Journal
, &rdev
->flags
) &&
6159 !test_bit(Faulty
, &rdev
->flags
))
6161 if (bdev_read_only(rdev
->bdev
))
6162 has_readonly
= true;
6165 if (test_bit(MD_HAS_JOURNAL
, &mddev
->flags
) && !has_journal
)
6166 /* Don't restart rw with journal missing/faulty */
6171 mddev
->safemode
= 0;
6173 set_disk_ro(disk
, 0);
6174 pr_debug("md: %s switched to read-write mode.\n", mdname(mddev
));
6175 /* Kick recovery or resync if necessary */
6176 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6177 md_wakeup_thread(mddev
->thread
);
6178 md_wakeup_thread(mddev
->sync_thread
);
6179 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6183 static void md_clean(struct mddev
*mddev
)
6185 mddev
->array_sectors
= 0;
6186 mddev
->external_size
= 0;
6187 mddev
->dev_sectors
= 0;
6188 mddev
->raid_disks
= 0;
6189 mddev
->recovery_cp
= 0;
6190 mddev
->resync_min
= 0;
6191 mddev
->resync_max
= MaxSector
;
6192 mddev
->reshape_position
= MaxSector
;
6193 mddev
->external
= 0;
6194 mddev
->persistent
= 0;
6195 mddev
->level
= LEVEL_NONE
;
6196 mddev
->clevel
[0] = 0;
6198 mddev
->sb_flags
= 0;
6200 mddev
->metadata_type
[0] = 0;
6201 mddev
->chunk_sectors
= 0;
6202 mddev
->ctime
= mddev
->utime
= 0;
6204 mddev
->max_disks
= 0;
6206 mddev
->can_decrease_events
= 0;
6207 mddev
->delta_disks
= 0;
6208 mddev
->reshape_backwards
= 0;
6209 mddev
->new_level
= LEVEL_NONE
;
6210 mddev
->new_layout
= 0;
6211 mddev
->new_chunk_sectors
= 0;
6212 mddev
->curr_resync
= 0;
6213 atomic64_set(&mddev
->resync_mismatches
, 0);
6214 mddev
->suspend_lo
= mddev
->suspend_hi
= 0;
6215 mddev
->sync_speed_min
= mddev
->sync_speed_max
= 0;
6216 mddev
->recovery
= 0;
6219 mddev
->degraded
= 0;
6220 mddev
->safemode
= 0;
6221 mddev
->private = NULL
;
6222 mddev
->cluster_info
= NULL
;
6223 mddev
->bitmap_info
.offset
= 0;
6224 mddev
->bitmap_info
.default_offset
= 0;
6225 mddev
->bitmap_info
.default_space
= 0;
6226 mddev
->bitmap_info
.chunksize
= 0;
6227 mddev
->bitmap_info
.daemon_sleep
= 0;
6228 mddev
->bitmap_info
.max_write_behind
= 0;
6229 mddev
->bitmap_info
.nodes
= 0;
6232 static void __md_stop_writes(struct mddev
*mddev
)
6234 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
6235 if (work_pending(&mddev
->del_work
))
6236 flush_workqueue(md_misc_wq
);
6237 if (mddev
->sync_thread
) {
6238 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6239 md_reap_sync_thread(mddev
);
6242 del_timer_sync(&mddev
->safemode_timer
);
6244 if (mddev
->pers
&& mddev
->pers
->quiesce
) {
6245 mddev
->pers
->quiesce(mddev
, 1);
6246 mddev
->pers
->quiesce(mddev
, 0);
6248 md_bitmap_flush(mddev
);
6250 if (mddev
->ro
== 0 &&
6251 ((!mddev
->in_sync
&& !mddev_is_clustered(mddev
)) ||
6253 /* mark array as shutdown cleanly */
6254 if (!mddev_is_clustered(mddev
))
6256 md_update_sb(mddev
, 1);
6258 /* disable policy to guarantee rdevs free resources for serialization */
6259 mddev
->serialize_policy
= 0;
6260 mddev_destroy_serial_pool(mddev
, NULL
, true);
6263 void md_stop_writes(struct mddev
*mddev
)
6265 mddev_lock_nointr(mddev
);
6266 __md_stop_writes(mddev
);
6267 mddev_unlock(mddev
);
6269 EXPORT_SYMBOL_GPL(md_stop_writes
);
6271 static void mddev_detach(struct mddev
*mddev
)
6273 md_bitmap_wait_behind_writes(mddev
);
6274 if (mddev
->pers
&& mddev
->pers
->quiesce
&& !mddev
->suspended
) {
6275 mddev
->pers
->quiesce(mddev
, 1);
6276 mddev
->pers
->quiesce(mddev
, 0);
6278 md_unregister_thread(&mddev
->thread
);
6280 blk_sync_queue(mddev
->queue
); /* the unplug fn references 'conf'*/
6283 static void __md_stop(struct mddev
*mddev
)
6285 struct md_personality
*pers
= mddev
->pers
;
6286 md_bitmap_destroy(mddev
);
6287 mddev_detach(mddev
);
6288 /* Ensure ->event_work is done */
6289 if (mddev
->event_work
.func
)
6290 flush_workqueue(md_misc_wq
);
6291 spin_lock(&mddev
->lock
);
6293 spin_unlock(&mddev
->lock
);
6294 pers
->free(mddev
, mddev
->private);
6295 mddev
->private = NULL
;
6296 if (pers
->sync_request
&& mddev
->to_remove
== NULL
)
6297 mddev
->to_remove
= &md_redundancy_group
;
6298 module_put(pers
->owner
);
6299 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
6302 void md_stop(struct mddev
*mddev
)
6304 /* stop the array and free an attached data structures.
6305 * This is called from dm-raid
6308 bioset_exit(&mddev
->bio_set
);
6309 bioset_exit(&mddev
->sync_set
);
6312 EXPORT_SYMBOL_GPL(md_stop
);
6314 static int md_set_readonly(struct mddev
*mddev
, struct block_device
*bdev
)
6319 if (!test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
)) {
6321 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
6322 md_wakeup_thread(mddev
->thread
);
6324 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
6325 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6326 if (mddev
->sync_thread
)
6327 /* Thread might be blocked waiting for metadata update
6328 * which will now never happen */
6329 wake_up_process(mddev
->sync_thread
->tsk
);
6331 if (mddev
->external
&& test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
))
6333 mddev_unlock(mddev
);
6334 wait_event(resync_wait
, !test_bit(MD_RECOVERY_RUNNING
,
6336 wait_event(mddev
->sb_wait
,
6337 !test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
));
6338 mddev_lock_nointr(mddev
);
6340 mutex_lock(&mddev
->open_mutex
);
6341 if ((mddev
->pers
&& atomic_read(&mddev
->openers
) > !!bdev
) ||
6342 mddev
->sync_thread
||
6343 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
)) {
6344 pr_warn("md: %s still in use.\n",mdname(mddev
));
6346 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
6347 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6348 md_wakeup_thread(mddev
->thread
);
6354 __md_stop_writes(mddev
);
6360 set_disk_ro(mddev
->gendisk
, 1);
6361 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
6362 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6363 md_wakeup_thread(mddev
->thread
);
6364 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6368 mutex_unlock(&mddev
->open_mutex
);
6373 * 0 - completely stop and dis-assemble array
6374 * 2 - stop but do not disassemble array
6376 static int do_md_stop(struct mddev
*mddev
, int mode
,
6377 struct block_device
*bdev
)
6379 struct gendisk
*disk
= mddev
->gendisk
;
6380 struct md_rdev
*rdev
;
6383 if (!test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
)) {
6385 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
6386 md_wakeup_thread(mddev
->thread
);
6388 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
6389 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6390 if (mddev
->sync_thread
)
6391 /* Thread might be blocked waiting for metadata update
6392 * which will now never happen */
6393 wake_up_process(mddev
->sync_thread
->tsk
);
6395 mddev_unlock(mddev
);
6396 wait_event(resync_wait
, (mddev
->sync_thread
== NULL
&&
6397 !test_bit(MD_RECOVERY_RUNNING
,
6398 &mddev
->recovery
)));
6399 mddev_lock_nointr(mddev
);
6401 mutex_lock(&mddev
->open_mutex
);
6402 if ((mddev
->pers
&& atomic_read(&mddev
->openers
) > !!bdev
) ||
6403 mddev
->sysfs_active
||
6404 mddev
->sync_thread
||
6405 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
)) {
6406 pr_warn("md: %s still in use.\n",mdname(mddev
));
6407 mutex_unlock(&mddev
->open_mutex
);
6409 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
6410 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6411 md_wakeup_thread(mddev
->thread
);
6417 set_disk_ro(disk
, 0);
6419 __md_stop_writes(mddev
);
6422 /* tell userspace to handle 'inactive' */
6423 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6425 rdev_for_each(rdev
, mddev
)
6426 if (rdev
->raid_disk
>= 0)
6427 sysfs_unlink_rdev(mddev
, rdev
);
6429 set_capacity_and_notify(disk
, 0);
6430 mutex_unlock(&mddev
->open_mutex
);
6436 mutex_unlock(&mddev
->open_mutex
);
6438 * Free resources if final stop
6441 pr_info("md: %s stopped.\n", mdname(mddev
));
6443 if (mddev
->bitmap_info
.file
) {
6444 struct file
*f
= mddev
->bitmap_info
.file
;
6445 spin_lock(&mddev
->lock
);
6446 mddev
->bitmap_info
.file
= NULL
;
6447 spin_unlock(&mddev
->lock
);
6450 mddev
->bitmap_info
.offset
= 0;
6452 export_array(mddev
);
6455 if (mddev
->hold_active
== UNTIL_STOP
)
6456 mddev
->hold_active
= 0;
6458 md_new_event(mddev
);
6459 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6464 static void autorun_array(struct mddev
*mddev
)
6466 struct md_rdev
*rdev
;
6469 if (list_empty(&mddev
->disks
))
6472 pr_info("md: running: ");
6474 rdev_for_each(rdev
, mddev
) {
6475 char b
[BDEVNAME_SIZE
];
6476 pr_cont("<%s>", bdevname(rdev
->bdev
,b
));
6480 err
= do_md_run(mddev
);
6482 pr_warn("md: do_md_run() returned %d\n", err
);
6483 do_md_stop(mddev
, 0, NULL
);
6488 * lets try to run arrays based on all disks that have arrived
6489 * until now. (those are in pending_raid_disks)
6491 * the method: pick the first pending disk, collect all disks with
6492 * the same UUID, remove all from the pending list and put them into
6493 * the 'same_array' list. Then order this list based on superblock
6494 * update time (freshest comes first), kick out 'old' disks and
6495 * compare superblocks. If everything's fine then run it.
6497 * If "unit" is allocated, then bump its reference count
6499 static void autorun_devices(int part
)
6501 struct md_rdev
*rdev0
, *rdev
, *tmp
;
6502 struct mddev
*mddev
;
6503 char b
[BDEVNAME_SIZE
];
6505 pr_info("md: autorun ...\n");
6506 while (!list_empty(&pending_raid_disks
)) {
6509 LIST_HEAD(candidates
);
6510 rdev0
= list_entry(pending_raid_disks
.next
,
6511 struct md_rdev
, same_set
);
6513 pr_debug("md: considering %s ...\n", bdevname(rdev0
->bdev
,b
));
6514 INIT_LIST_HEAD(&candidates
);
6515 rdev_for_each_list(rdev
, tmp
, &pending_raid_disks
)
6516 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
6517 pr_debug("md: adding %s ...\n",
6518 bdevname(rdev
->bdev
,b
));
6519 list_move(&rdev
->same_set
, &candidates
);
6522 * now we have a set of devices, with all of them having
6523 * mostly sane superblocks. It's time to allocate the
6527 dev
= MKDEV(mdp_major
,
6528 rdev0
->preferred_minor
<< MdpMinorShift
);
6529 unit
= MINOR(dev
) >> MdpMinorShift
;
6531 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
6534 if (rdev0
->preferred_minor
!= unit
) {
6535 pr_warn("md: unit number in %s is bad: %d\n",
6536 bdevname(rdev0
->bdev
, b
), rdev0
->preferred_minor
);
6541 mddev
= mddev_find(dev
);
6542 if (!mddev
|| !mddev
->gendisk
) {
6547 if (mddev_lock(mddev
))
6548 pr_warn("md: %s locked, cannot run\n", mdname(mddev
));
6549 else if (mddev
->raid_disks
|| mddev
->major_version
6550 || !list_empty(&mddev
->disks
)) {
6551 pr_warn("md: %s already running, cannot run %s\n",
6552 mdname(mddev
), bdevname(rdev0
->bdev
,b
));
6553 mddev_unlock(mddev
);
6555 pr_debug("md: created %s\n", mdname(mddev
));
6556 mddev
->persistent
= 1;
6557 rdev_for_each_list(rdev
, tmp
, &candidates
) {
6558 list_del_init(&rdev
->same_set
);
6559 if (bind_rdev_to_array(rdev
, mddev
))
6562 autorun_array(mddev
);
6563 mddev_unlock(mddev
);
6565 /* on success, candidates will be empty, on error
6568 rdev_for_each_list(rdev
, tmp
, &candidates
) {
6569 list_del_init(&rdev
->same_set
);
6574 pr_info("md: ... autorun DONE.\n");
6576 #endif /* !MODULE */
6578 static int get_version(void __user
*arg
)
6582 ver
.major
= MD_MAJOR_VERSION
;
6583 ver
.minor
= MD_MINOR_VERSION
;
6584 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
6586 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
6592 static int get_array_info(struct mddev
*mddev
, void __user
*arg
)
6594 mdu_array_info_t info
;
6595 int nr
,working
,insync
,failed
,spare
;
6596 struct md_rdev
*rdev
;
6598 nr
= working
= insync
= failed
= spare
= 0;
6600 rdev_for_each_rcu(rdev
, mddev
) {
6602 if (test_bit(Faulty
, &rdev
->flags
))
6606 if (test_bit(In_sync
, &rdev
->flags
))
6608 else if (test_bit(Journal
, &rdev
->flags
))
6609 /* TODO: add journal count to md_u.h */
6617 info
.major_version
= mddev
->major_version
;
6618 info
.minor_version
= mddev
->minor_version
;
6619 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
6620 info
.ctime
= clamp_t(time64_t
, mddev
->ctime
, 0, U32_MAX
);
6621 info
.level
= mddev
->level
;
6622 info
.size
= mddev
->dev_sectors
/ 2;
6623 if (info
.size
!= mddev
->dev_sectors
/ 2) /* overflow */
6626 info
.raid_disks
= mddev
->raid_disks
;
6627 info
.md_minor
= mddev
->md_minor
;
6628 info
.not_persistent
= !mddev
->persistent
;
6630 info
.utime
= clamp_t(time64_t
, mddev
->utime
, 0, U32_MAX
);
6633 info
.state
= (1<<MD_SB_CLEAN
);
6634 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
6635 info
.state
|= (1<<MD_SB_BITMAP_PRESENT
);
6636 if (mddev_is_clustered(mddev
))
6637 info
.state
|= (1<<MD_SB_CLUSTERED
);
6638 info
.active_disks
= insync
;
6639 info
.working_disks
= working
;
6640 info
.failed_disks
= failed
;
6641 info
.spare_disks
= spare
;
6643 info
.layout
= mddev
->layout
;
6644 info
.chunk_size
= mddev
->chunk_sectors
<< 9;
6646 if (copy_to_user(arg
, &info
, sizeof(info
)))
6652 static int get_bitmap_file(struct mddev
*mddev
, void __user
* arg
)
6654 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
6658 file
= kzalloc(sizeof(*file
), GFP_NOIO
);
6663 spin_lock(&mddev
->lock
);
6664 /* bitmap enabled */
6665 if (mddev
->bitmap_info
.file
) {
6666 ptr
= file_path(mddev
->bitmap_info
.file
, file
->pathname
,
6667 sizeof(file
->pathname
));
6671 memmove(file
->pathname
, ptr
,
6672 sizeof(file
->pathname
)-(ptr
-file
->pathname
));
6674 spin_unlock(&mddev
->lock
);
6677 copy_to_user(arg
, file
, sizeof(*file
)))
6684 static int get_disk_info(struct mddev
*mddev
, void __user
* arg
)
6686 mdu_disk_info_t info
;
6687 struct md_rdev
*rdev
;
6689 if (copy_from_user(&info
, arg
, sizeof(info
)))
6693 rdev
= md_find_rdev_nr_rcu(mddev
, info
.number
);
6695 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
6696 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
6697 info
.raid_disk
= rdev
->raid_disk
;
6699 if (test_bit(Faulty
, &rdev
->flags
))
6700 info
.state
|= (1<<MD_DISK_FAULTY
);
6701 else if (test_bit(In_sync
, &rdev
->flags
)) {
6702 info
.state
|= (1<<MD_DISK_ACTIVE
);
6703 info
.state
|= (1<<MD_DISK_SYNC
);
6705 if (test_bit(Journal
, &rdev
->flags
))
6706 info
.state
|= (1<<MD_DISK_JOURNAL
);
6707 if (test_bit(WriteMostly
, &rdev
->flags
))
6708 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
6709 if (test_bit(FailFast
, &rdev
->flags
))
6710 info
.state
|= (1<<MD_DISK_FAILFAST
);
6712 info
.major
= info
.minor
= 0;
6713 info
.raid_disk
= -1;
6714 info
.state
= (1<<MD_DISK_REMOVED
);
6718 if (copy_to_user(arg
, &info
, sizeof(info
)))
6724 int md_add_new_disk(struct mddev
*mddev
, struct mdu_disk_info_s
*info
)
6726 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
6727 struct md_rdev
*rdev
;
6728 dev_t dev
= MKDEV(info
->major
,info
->minor
);
6730 if (mddev_is_clustered(mddev
) &&
6731 !(info
->state
& ((1 << MD_DISK_CLUSTER_ADD
) | (1 << MD_DISK_CANDIDATE
)))) {
6732 pr_warn("%s: Cannot add to clustered mddev.\n",
6737 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
6740 if (!mddev
->raid_disks
) {
6742 /* expecting a device which has a superblock */
6743 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
6745 pr_warn("md: md_import_device returned %ld\n",
6747 return PTR_ERR(rdev
);
6749 if (!list_empty(&mddev
->disks
)) {
6750 struct md_rdev
*rdev0
6751 = list_entry(mddev
->disks
.next
,
6752 struct md_rdev
, same_set
);
6753 err
= super_types
[mddev
->major_version
]
6754 .load_super(rdev
, rdev0
, mddev
->minor_version
);
6756 pr_warn("md: %s has different UUID to %s\n",
6757 bdevname(rdev
->bdev
,b
),
6758 bdevname(rdev0
->bdev
,b2
));
6763 err
= bind_rdev_to_array(rdev
, mddev
);
6770 * md_add_new_disk can be used once the array is assembled
6771 * to add "hot spares". They must already have a superblock
6776 if (!mddev
->pers
->hot_add_disk
) {
6777 pr_warn("%s: personality does not support diskops!\n",
6781 if (mddev
->persistent
)
6782 rdev
= md_import_device(dev
, mddev
->major_version
,
6783 mddev
->minor_version
);
6785 rdev
= md_import_device(dev
, -1, -1);
6787 pr_warn("md: md_import_device returned %ld\n",
6789 return PTR_ERR(rdev
);
6791 /* set saved_raid_disk if appropriate */
6792 if (!mddev
->persistent
) {
6793 if (info
->state
& (1<<MD_DISK_SYNC
) &&
6794 info
->raid_disk
< mddev
->raid_disks
) {
6795 rdev
->raid_disk
= info
->raid_disk
;
6796 set_bit(In_sync
, &rdev
->flags
);
6797 clear_bit(Bitmap_sync
, &rdev
->flags
);
6799 rdev
->raid_disk
= -1;
6800 rdev
->saved_raid_disk
= rdev
->raid_disk
;
6802 super_types
[mddev
->major_version
].
6803 validate_super(mddev
, rdev
);
6804 if ((info
->state
& (1<<MD_DISK_SYNC
)) &&
6805 rdev
->raid_disk
!= info
->raid_disk
) {
6806 /* This was a hot-add request, but events doesn't
6807 * match, so reject it.
6813 clear_bit(In_sync
, &rdev
->flags
); /* just to be sure */
6814 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
6815 set_bit(WriteMostly
, &rdev
->flags
);
6817 clear_bit(WriteMostly
, &rdev
->flags
);
6818 if (info
->state
& (1<<MD_DISK_FAILFAST
))
6819 set_bit(FailFast
, &rdev
->flags
);
6821 clear_bit(FailFast
, &rdev
->flags
);
6823 if (info
->state
& (1<<MD_DISK_JOURNAL
)) {
6824 struct md_rdev
*rdev2
;
6825 bool has_journal
= false;
6827 /* make sure no existing journal disk */
6828 rdev_for_each(rdev2
, mddev
) {
6829 if (test_bit(Journal
, &rdev2
->flags
)) {
6834 if (has_journal
|| mddev
->bitmap
) {
6838 set_bit(Journal
, &rdev
->flags
);
6841 * check whether the device shows up in other nodes
6843 if (mddev_is_clustered(mddev
)) {
6844 if (info
->state
& (1 << MD_DISK_CANDIDATE
))
6845 set_bit(Candidate
, &rdev
->flags
);
6846 else if (info
->state
& (1 << MD_DISK_CLUSTER_ADD
)) {
6847 /* --add initiated by this node */
6848 err
= md_cluster_ops
->add_new_disk(mddev
, rdev
);
6856 rdev
->raid_disk
= -1;
6857 err
= bind_rdev_to_array(rdev
, mddev
);
6862 if (mddev_is_clustered(mddev
)) {
6863 if (info
->state
& (1 << MD_DISK_CANDIDATE
)) {
6865 err
= md_cluster_ops
->new_disk_ack(mddev
,
6868 md_kick_rdev_from_array(rdev
);
6872 md_cluster_ops
->add_new_disk_cancel(mddev
);
6874 err
= add_bound_rdev(rdev
);
6878 err
= add_bound_rdev(rdev
);
6883 /* otherwise, md_add_new_disk is only allowed
6884 * for major_version==0 superblocks
6886 if (mddev
->major_version
!= 0) {
6887 pr_warn("%s: ADD_NEW_DISK not supported\n", mdname(mddev
));
6891 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
6893 rdev
= md_import_device(dev
, -1, 0);
6895 pr_warn("md: error, md_import_device() returned %ld\n",
6897 return PTR_ERR(rdev
);
6899 rdev
->desc_nr
= info
->number
;
6900 if (info
->raid_disk
< mddev
->raid_disks
)
6901 rdev
->raid_disk
= info
->raid_disk
;
6903 rdev
->raid_disk
= -1;
6905 if (rdev
->raid_disk
< mddev
->raid_disks
)
6906 if (info
->state
& (1<<MD_DISK_SYNC
))
6907 set_bit(In_sync
, &rdev
->flags
);
6909 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
6910 set_bit(WriteMostly
, &rdev
->flags
);
6911 if (info
->state
& (1<<MD_DISK_FAILFAST
))
6912 set_bit(FailFast
, &rdev
->flags
);
6914 if (!mddev
->persistent
) {
6915 pr_debug("md: nonpersistent superblock ...\n");
6916 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
6918 rdev
->sb_start
= calc_dev_sboffset(rdev
);
6919 rdev
->sectors
= rdev
->sb_start
;
6921 err
= bind_rdev_to_array(rdev
, mddev
);
6931 static int hot_remove_disk(struct mddev
*mddev
, dev_t dev
)
6933 char b
[BDEVNAME_SIZE
];
6934 struct md_rdev
*rdev
;
6939 rdev
= find_rdev(mddev
, dev
);
6943 if (rdev
->raid_disk
< 0)
6946 clear_bit(Blocked
, &rdev
->flags
);
6947 remove_and_add_spares(mddev
, rdev
);
6949 if (rdev
->raid_disk
>= 0)
6953 if (mddev_is_clustered(mddev
)) {
6954 if (md_cluster_ops
->remove_disk(mddev
, rdev
))
6958 md_kick_rdev_from_array(rdev
);
6959 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
6961 md_wakeup_thread(mddev
->thread
);
6963 md_update_sb(mddev
, 1);
6964 md_new_event(mddev
);
6968 pr_debug("md: cannot remove active disk %s from %s ...\n",
6969 bdevname(rdev
->bdev
,b
), mdname(mddev
));
6973 static int hot_add_disk(struct mddev
*mddev
, dev_t dev
)
6975 char b
[BDEVNAME_SIZE
];
6977 struct md_rdev
*rdev
;
6982 if (mddev
->major_version
!= 0) {
6983 pr_warn("%s: HOT_ADD may only be used with version-0 superblocks.\n",
6987 if (!mddev
->pers
->hot_add_disk
) {
6988 pr_warn("%s: personality does not support diskops!\n",
6993 rdev
= md_import_device(dev
, -1, 0);
6995 pr_warn("md: error, md_import_device() returned %ld\n",
7000 if (mddev
->persistent
)
7001 rdev
->sb_start
= calc_dev_sboffset(rdev
);
7003 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
7005 rdev
->sectors
= rdev
->sb_start
;
7007 if (test_bit(Faulty
, &rdev
->flags
)) {
7008 pr_warn("md: can not hot-add faulty %s disk to %s!\n",
7009 bdevname(rdev
->bdev
,b
), mdname(mddev
));
7014 clear_bit(In_sync
, &rdev
->flags
);
7016 rdev
->saved_raid_disk
= -1;
7017 err
= bind_rdev_to_array(rdev
, mddev
);
7022 * The rest should better be atomic, we can have disk failures
7023 * noticed in interrupt contexts ...
7026 rdev
->raid_disk
= -1;
7028 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
7030 md_update_sb(mddev
, 1);
7032 * Kick recovery, maybe this spare has to be added to the
7033 * array immediately.
7035 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7036 md_wakeup_thread(mddev
->thread
);
7037 md_new_event(mddev
);
7045 static int set_bitmap_file(struct mddev
*mddev
, int fd
)
7050 if (!mddev
->pers
->quiesce
|| !mddev
->thread
)
7052 if (mddev
->recovery
|| mddev
->sync_thread
)
7054 /* we should be able to change the bitmap.. */
7058 struct inode
*inode
;
7061 if (mddev
->bitmap
|| mddev
->bitmap_info
.file
)
7062 return -EEXIST
; /* cannot add when bitmap is present */
7066 pr_warn("%s: error: failed to get bitmap file\n",
7071 inode
= f
->f_mapping
->host
;
7072 if (!S_ISREG(inode
->i_mode
)) {
7073 pr_warn("%s: error: bitmap file must be a regular file\n",
7076 } else if (!(f
->f_mode
& FMODE_WRITE
)) {
7077 pr_warn("%s: error: bitmap file must open for write\n",
7080 } else if (atomic_read(&inode
->i_writecount
) != 1) {
7081 pr_warn("%s: error: bitmap file is already in use\n",
7089 mddev
->bitmap_info
.file
= f
;
7090 mddev
->bitmap_info
.offset
= 0; /* file overrides offset */
7091 } else if (mddev
->bitmap
== NULL
)
7092 return -ENOENT
; /* cannot remove what isn't there */
7096 struct bitmap
*bitmap
;
7098 bitmap
= md_bitmap_create(mddev
, -1);
7099 mddev_suspend(mddev
);
7100 if (!IS_ERR(bitmap
)) {
7101 mddev
->bitmap
= bitmap
;
7102 err
= md_bitmap_load(mddev
);
7104 err
= PTR_ERR(bitmap
);
7106 md_bitmap_destroy(mddev
);
7109 mddev_resume(mddev
);
7110 } else if (fd
< 0) {
7111 mddev_suspend(mddev
);
7112 md_bitmap_destroy(mddev
);
7113 mddev_resume(mddev
);
7117 struct file
*f
= mddev
->bitmap_info
.file
;
7119 spin_lock(&mddev
->lock
);
7120 mddev
->bitmap_info
.file
= NULL
;
7121 spin_unlock(&mddev
->lock
);
7130 * md_set_array_info is used two different ways
7131 * The original usage is when creating a new array.
7132 * In this usage, raid_disks is > 0 and it together with
7133 * level, size, not_persistent,layout,chunksize determine the
7134 * shape of the array.
7135 * This will always create an array with a type-0.90.0 superblock.
7136 * The newer usage is when assembling an array.
7137 * In this case raid_disks will be 0, and the major_version field is
7138 * use to determine which style super-blocks are to be found on the devices.
7139 * The minor and patch _version numbers are also kept incase the
7140 * super_block handler wishes to interpret them.
7142 int md_set_array_info(struct mddev
*mddev
, struct mdu_array_info_s
*info
)
7144 if (info
->raid_disks
== 0) {
7145 /* just setting version number for superblock loading */
7146 if (info
->major_version
< 0 ||
7147 info
->major_version
>= ARRAY_SIZE(super_types
) ||
7148 super_types
[info
->major_version
].name
== NULL
) {
7149 /* maybe try to auto-load a module? */
7150 pr_warn("md: superblock version %d not known\n",
7151 info
->major_version
);
7154 mddev
->major_version
= info
->major_version
;
7155 mddev
->minor_version
= info
->minor_version
;
7156 mddev
->patch_version
= info
->patch_version
;
7157 mddev
->persistent
= !info
->not_persistent
;
7158 /* ensure mddev_put doesn't delete this now that there
7159 * is some minimal configuration.
7161 mddev
->ctime
= ktime_get_real_seconds();
7164 mddev
->major_version
= MD_MAJOR_VERSION
;
7165 mddev
->minor_version
= MD_MINOR_VERSION
;
7166 mddev
->patch_version
= MD_PATCHLEVEL_VERSION
;
7167 mddev
->ctime
= ktime_get_real_seconds();
7169 mddev
->level
= info
->level
;
7170 mddev
->clevel
[0] = 0;
7171 mddev
->dev_sectors
= 2 * (sector_t
)info
->size
;
7172 mddev
->raid_disks
= info
->raid_disks
;
7173 /* don't set md_minor, it is determined by which /dev/md* was
7176 if (info
->state
& (1<<MD_SB_CLEAN
))
7177 mddev
->recovery_cp
= MaxSector
;
7179 mddev
->recovery_cp
= 0;
7180 mddev
->persistent
= ! info
->not_persistent
;
7181 mddev
->external
= 0;
7183 mddev
->layout
= info
->layout
;
7184 if (mddev
->level
== 0)
7185 /* Cannot trust RAID0 layout info here */
7187 mddev
->chunk_sectors
= info
->chunk_size
>> 9;
7189 if (mddev
->persistent
) {
7190 mddev
->max_disks
= MD_SB_DISKS
;
7192 mddev
->sb_flags
= 0;
7194 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
7196 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
7197 mddev
->bitmap_info
.default_space
= 64*2 - (MD_SB_BYTES
>> 9);
7198 mddev
->bitmap_info
.offset
= 0;
7200 mddev
->reshape_position
= MaxSector
;
7203 * Generate a 128 bit UUID
7205 get_random_bytes(mddev
->uuid
, 16);
7207 mddev
->new_level
= mddev
->level
;
7208 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
7209 mddev
->new_layout
= mddev
->layout
;
7210 mddev
->delta_disks
= 0;
7211 mddev
->reshape_backwards
= 0;
7216 void md_set_array_sectors(struct mddev
*mddev
, sector_t array_sectors
)
7218 lockdep_assert_held(&mddev
->reconfig_mutex
);
7220 if (mddev
->external_size
)
7223 mddev
->array_sectors
= array_sectors
;
7225 EXPORT_SYMBOL(md_set_array_sectors
);
7227 static int update_size(struct mddev
*mddev
, sector_t num_sectors
)
7229 struct md_rdev
*rdev
;
7231 int fit
= (num_sectors
== 0);
7232 sector_t old_dev_sectors
= mddev
->dev_sectors
;
7234 if (mddev
->pers
->resize
== NULL
)
7236 /* The "num_sectors" is the number of sectors of each device that
7237 * is used. This can only make sense for arrays with redundancy.
7238 * linear and raid0 always use whatever space is available. We can only
7239 * consider changing this number if no resync or reconstruction is
7240 * happening, and if the new size is acceptable. It must fit before the
7241 * sb_start or, if that is <data_offset, it must fit before the size
7242 * of each device. If num_sectors is zero, we find the largest size
7245 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
7251 rdev_for_each(rdev
, mddev
) {
7252 sector_t avail
= rdev
->sectors
;
7254 if (fit
&& (num_sectors
== 0 || num_sectors
> avail
))
7255 num_sectors
= avail
;
7256 if (avail
< num_sectors
)
7259 rv
= mddev
->pers
->resize(mddev
, num_sectors
);
7261 if (mddev_is_clustered(mddev
))
7262 md_cluster_ops
->update_size(mddev
, old_dev_sectors
);
7263 else if (mddev
->queue
) {
7264 set_capacity_and_notify(mddev
->gendisk
,
7265 mddev
->array_sectors
);
7271 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
)
7274 struct md_rdev
*rdev
;
7275 /* change the number of raid disks */
7276 if (mddev
->pers
->check_reshape
== NULL
)
7280 if (raid_disks
<= 0 ||
7281 (mddev
->max_disks
&& raid_disks
>= mddev
->max_disks
))
7283 if (mddev
->sync_thread
||
7284 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
7285 test_bit(MD_RESYNCING_REMOTE
, &mddev
->recovery
) ||
7286 mddev
->reshape_position
!= MaxSector
)
7289 rdev_for_each(rdev
, mddev
) {
7290 if (mddev
->raid_disks
< raid_disks
&&
7291 rdev
->data_offset
< rdev
->new_data_offset
)
7293 if (mddev
->raid_disks
> raid_disks
&&
7294 rdev
->data_offset
> rdev
->new_data_offset
)
7298 mddev
->delta_disks
= raid_disks
- mddev
->raid_disks
;
7299 if (mddev
->delta_disks
< 0)
7300 mddev
->reshape_backwards
= 1;
7301 else if (mddev
->delta_disks
> 0)
7302 mddev
->reshape_backwards
= 0;
7304 rv
= mddev
->pers
->check_reshape(mddev
);
7306 mddev
->delta_disks
= 0;
7307 mddev
->reshape_backwards
= 0;
7313 * update_array_info is used to change the configuration of an
7315 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
7316 * fields in the info are checked against the array.
7317 * Any differences that cannot be handled will cause an error.
7318 * Normally, only one change can be managed at a time.
7320 static int update_array_info(struct mddev
*mddev
, mdu_array_info_t
*info
)
7326 /* calculate expected state,ignoring low bits */
7327 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
7328 state
|= (1 << MD_SB_BITMAP_PRESENT
);
7330 if (mddev
->major_version
!= info
->major_version
||
7331 mddev
->minor_version
!= info
->minor_version
||
7332 /* mddev->patch_version != info->patch_version || */
7333 mddev
->ctime
!= info
->ctime
||
7334 mddev
->level
!= info
->level
||
7335 /* mddev->layout != info->layout || */
7336 mddev
->persistent
!= !info
->not_persistent
||
7337 mddev
->chunk_sectors
!= info
->chunk_size
>> 9 ||
7338 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
7339 ((state
^info
->state
) & 0xfffffe00)
7342 /* Check there is only one change */
7343 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
7345 if (mddev
->raid_disks
!= info
->raid_disks
)
7347 if (mddev
->layout
!= info
->layout
)
7349 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
))
7356 if (mddev
->layout
!= info
->layout
) {
7358 * we don't need to do anything at the md level, the
7359 * personality will take care of it all.
7361 if (mddev
->pers
->check_reshape
== NULL
)
7364 mddev
->new_layout
= info
->layout
;
7365 rv
= mddev
->pers
->check_reshape(mddev
);
7367 mddev
->new_layout
= mddev
->layout
;
7371 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
7372 rv
= update_size(mddev
, (sector_t
)info
->size
* 2);
7374 if (mddev
->raid_disks
!= info
->raid_disks
)
7375 rv
= update_raid_disks(mddev
, info
->raid_disks
);
7377 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) {
7378 if (mddev
->pers
->quiesce
== NULL
|| mddev
->thread
== NULL
) {
7382 if (mddev
->recovery
|| mddev
->sync_thread
) {
7386 if (info
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
7387 struct bitmap
*bitmap
;
7388 /* add the bitmap */
7389 if (mddev
->bitmap
) {
7393 if (mddev
->bitmap_info
.default_offset
== 0) {
7397 mddev
->bitmap_info
.offset
=
7398 mddev
->bitmap_info
.default_offset
;
7399 mddev
->bitmap_info
.space
=
7400 mddev
->bitmap_info
.default_space
;
7401 bitmap
= md_bitmap_create(mddev
, -1);
7402 mddev_suspend(mddev
);
7403 if (!IS_ERR(bitmap
)) {
7404 mddev
->bitmap
= bitmap
;
7405 rv
= md_bitmap_load(mddev
);
7407 rv
= PTR_ERR(bitmap
);
7409 md_bitmap_destroy(mddev
);
7410 mddev_resume(mddev
);
7412 /* remove the bitmap */
7413 if (!mddev
->bitmap
) {
7417 if (mddev
->bitmap
->storage
.file
) {
7421 if (mddev
->bitmap_info
.nodes
) {
7422 /* hold PW on all the bitmap lock */
7423 if (md_cluster_ops
->lock_all_bitmaps(mddev
) <= 0) {
7424 pr_warn("md: can't change bitmap to none since the array is in use by more than one node\n");
7426 md_cluster_ops
->unlock_all_bitmaps(mddev
);
7430 mddev
->bitmap_info
.nodes
= 0;
7431 md_cluster_ops
->leave(mddev
);
7432 module_put(md_cluster_mod
);
7433 mddev
->safemode_delay
= DEFAULT_SAFEMODE_DELAY
;
7435 mddev_suspend(mddev
);
7436 md_bitmap_destroy(mddev
);
7437 mddev_resume(mddev
);
7438 mddev
->bitmap_info
.offset
= 0;
7441 md_update_sb(mddev
, 1);
7447 static int set_disk_faulty(struct mddev
*mddev
, dev_t dev
)
7449 struct md_rdev
*rdev
;
7452 if (mddev
->pers
== NULL
)
7456 rdev
= md_find_rdev_rcu(mddev
, dev
);
7460 md_error(mddev
, rdev
);
7461 if (!test_bit(Faulty
, &rdev
->flags
))
7469 * We have a problem here : there is no easy way to give a CHS
7470 * virtual geometry. We currently pretend that we have a 2 heads
7471 * 4 sectors (with a BIG number of cylinders...). This drives
7472 * dosfs just mad... ;-)
7474 static int md_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
7476 struct mddev
*mddev
= bdev
->bd_disk
->private_data
;
7480 geo
->cylinders
= mddev
->array_sectors
/ 8;
7484 static inline bool md_ioctl_valid(unsigned int cmd
)
7488 case GET_ARRAY_INFO
:
7489 case GET_BITMAP_FILE
:
7492 case HOT_REMOVE_DISK
:
7494 case RESTART_ARRAY_RW
:
7496 case SET_ARRAY_INFO
:
7497 case SET_BITMAP_FILE
:
7498 case SET_DISK_FAULTY
:
7501 case CLUSTERED_DISK_NACK
:
7508 static int md_ioctl(struct block_device
*bdev
, fmode_t mode
,
7509 unsigned int cmd
, unsigned long arg
)
7512 void __user
*argp
= (void __user
*)arg
;
7513 struct mddev
*mddev
= NULL
;
7514 bool did_set_md_closing
= false;
7516 if (!md_ioctl_valid(cmd
))
7521 case GET_ARRAY_INFO
:
7525 if (!capable(CAP_SYS_ADMIN
))
7530 * Commands dealing with the RAID driver but not any
7535 err
= get_version(argp
);
7541 * Commands creating/starting a new array:
7544 mddev
= bdev
->bd_disk
->private_data
;
7551 /* Some actions do not requires the mutex */
7553 case GET_ARRAY_INFO
:
7554 if (!mddev
->raid_disks
&& !mddev
->external
)
7557 err
= get_array_info(mddev
, argp
);
7561 if (!mddev
->raid_disks
&& !mddev
->external
)
7564 err
= get_disk_info(mddev
, argp
);
7567 case SET_DISK_FAULTY
:
7568 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
7571 case GET_BITMAP_FILE
:
7572 err
= get_bitmap_file(mddev
, argp
);
7577 if (cmd
== ADD_NEW_DISK
|| cmd
== HOT_ADD_DISK
)
7578 flush_rdev_wq(mddev
);
7580 if (cmd
== HOT_REMOVE_DISK
)
7581 /* need to ensure recovery thread has run */
7582 wait_event_interruptible_timeout(mddev
->sb_wait
,
7583 !test_bit(MD_RECOVERY_NEEDED
,
7585 msecs_to_jiffies(5000));
7586 if (cmd
== STOP_ARRAY
|| cmd
== STOP_ARRAY_RO
) {
7587 /* Need to flush page cache, and ensure no-one else opens
7590 mutex_lock(&mddev
->open_mutex
);
7591 if (mddev
->pers
&& atomic_read(&mddev
->openers
) > 1) {
7592 mutex_unlock(&mddev
->open_mutex
);
7596 if (test_and_set_bit(MD_CLOSING
, &mddev
->flags
)) {
7597 mutex_unlock(&mddev
->open_mutex
);
7601 did_set_md_closing
= true;
7602 mutex_unlock(&mddev
->open_mutex
);
7603 sync_blockdev(bdev
);
7605 err
= mddev_lock(mddev
);
7607 pr_debug("md: ioctl lock interrupted, reason %d, cmd %d\n",
7612 if (cmd
== SET_ARRAY_INFO
) {
7613 mdu_array_info_t info
;
7615 memset(&info
, 0, sizeof(info
));
7616 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
7621 err
= update_array_info(mddev
, &info
);
7623 pr_warn("md: couldn't update array info. %d\n", err
);
7628 if (!list_empty(&mddev
->disks
)) {
7629 pr_warn("md: array %s already has disks!\n", mdname(mddev
));
7633 if (mddev
->raid_disks
) {
7634 pr_warn("md: array %s already initialised!\n", mdname(mddev
));
7638 err
= md_set_array_info(mddev
, &info
);
7640 pr_warn("md: couldn't set array info. %d\n", err
);
7647 * Commands querying/configuring an existing array:
7649 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
7650 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
7651 if ((!mddev
->raid_disks
&& !mddev
->external
)
7652 && cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
7653 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
7654 && cmd
!= GET_BITMAP_FILE
) {
7660 * Commands even a read-only array can execute:
7663 case RESTART_ARRAY_RW
:
7664 err
= restart_array(mddev
);
7668 err
= do_md_stop(mddev
, 0, bdev
);
7672 err
= md_set_readonly(mddev
, bdev
);
7675 case HOT_REMOVE_DISK
:
7676 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
7680 /* We can support ADD_NEW_DISK on read-only arrays
7681 * only if we are re-adding a preexisting device.
7682 * So require mddev->pers and MD_DISK_SYNC.
7685 mdu_disk_info_t info
;
7686 if (copy_from_user(&info
, argp
, sizeof(info
)))
7688 else if (!(info
.state
& (1<<MD_DISK_SYNC
)))
7689 /* Need to clear read-only for this */
7692 err
= md_add_new_disk(mddev
, &info
);
7699 * The remaining ioctls are changing the state of the
7700 * superblock, so we do not allow them on read-only arrays.
7702 if (mddev
->ro
&& mddev
->pers
) {
7703 if (mddev
->ro
== 2) {
7705 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7706 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7707 /* mddev_unlock will wake thread */
7708 /* If a device failed while we were read-only, we
7709 * need to make sure the metadata is updated now.
7711 if (test_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
)) {
7712 mddev_unlock(mddev
);
7713 wait_event(mddev
->sb_wait
,
7714 !test_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
) &&
7715 !test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
));
7716 mddev_lock_nointr(mddev
);
7727 mdu_disk_info_t info
;
7728 if (copy_from_user(&info
, argp
, sizeof(info
)))
7731 err
= md_add_new_disk(mddev
, &info
);
7735 case CLUSTERED_DISK_NACK
:
7736 if (mddev_is_clustered(mddev
))
7737 md_cluster_ops
->new_disk_ack(mddev
, false);
7743 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
7747 err
= do_md_run(mddev
);
7750 case SET_BITMAP_FILE
:
7751 err
= set_bitmap_file(mddev
, (int)arg
);
7760 if (mddev
->hold_active
== UNTIL_IOCTL
&&
7762 mddev
->hold_active
= 0;
7763 mddev_unlock(mddev
);
7765 if(did_set_md_closing
)
7766 clear_bit(MD_CLOSING
, &mddev
->flags
);
7769 #ifdef CONFIG_COMPAT
7770 static int md_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
7771 unsigned int cmd
, unsigned long arg
)
7774 case HOT_REMOVE_DISK
:
7776 case SET_DISK_FAULTY
:
7777 case SET_BITMAP_FILE
:
7778 /* These take in integer arg, do not convert */
7781 arg
= (unsigned long)compat_ptr(arg
);
7785 return md_ioctl(bdev
, mode
, cmd
, arg
);
7787 #endif /* CONFIG_COMPAT */
7789 static int md_set_read_only(struct block_device
*bdev
, bool ro
)
7791 struct mddev
*mddev
= bdev
->bd_disk
->private_data
;
7794 err
= mddev_lock(mddev
);
7798 if (!mddev
->raid_disks
&& !mddev
->external
) {
7804 * Transitioning to read-auto need only happen for arrays that call
7805 * md_write_start and which are not ready for writes yet.
7807 if (!ro
&& mddev
->ro
== 1 && mddev
->pers
) {
7808 err
= restart_array(mddev
);
7815 mddev_unlock(mddev
);
7819 static int md_open(struct block_device
*bdev
, fmode_t mode
)
7822 * Succeed if we can lock the mddev, which confirms that
7823 * it isn't being stopped right now.
7825 struct mddev
*mddev
= mddev_find(bdev
->bd_dev
);
7831 if (mddev
->gendisk
!= bdev
->bd_disk
) {
7832 /* we are racing with mddev_put which is discarding this
7836 /* Wait until bdev->bd_disk is definitely gone */
7837 if (work_pending(&mddev
->del_work
))
7838 flush_workqueue(md_misc_wq
);
7839 /* Then retry the open from the top */
7840 return -ERESTARTSYS
;
7842 BUG_ON(mddev
!= bdev
->bd_disk
->private_data
);
7844 if ((err
= mutex_lock_interruptible(&mddev
->open_mutex
)))
7847 if (test_bit(MD_CLOSING
, &mddev
->flags
)) {
7848 mutex_unlock(&mddev
->open_mutex
);
7854 atomic_inc(&mddev
->openers
);
7855 mutex_unlock(&mddev
->open_mutex
);
7857 bdev_check_media_change(bdev
);
7864 static void md_release(struct gendisk
*disk
, fmode_t mode
)
7866 struct mddev
*mddev
= disk
->private_data
;
7869 atomic_dec(&mddev
->openers
);
7873 static unsigned int md_check_events(struct gendisk
*disk
, unsigned int clearing
)
7875 struct mddev
*mddev
= disk
->private_data
;
7876 unsigned int ret
= 0;
7879 ret
= DISK_EVENT_MEDIA_CHANGE
;
7884 const struct block_device_operations md_fops
=
7886 .owner
= THIS_MODULE
,
7887 .submit_bio
= md_submit_bio
,
7889 .release
= md_release
,
7891 #ifdef CONFIG_COMPAT
7892 .compat_ioctl
= md_compat_ioctl
,
7894 .getgeo
= md_getgeo
,
7895 .check_events
= md_check_events
,
7896 .set_read_only
= md_set_read_only
,
7899 static int md_thread(void *arg
)
7901 struct md_thread
*thread
= arg
;
7904 * md_thread is a 'system-thread', it's priority should be very
7905 * high. We avoid resource deadlocks individually in each
7906 * raid personality. (RAID5 does preallocation) We also use RR and
7907 * the very same RT priority as kswapd, thus we will never get
7908 * into a priority inversion deadlock.
7910 * we definitely have to have equal or higher priority than
7911 * bdflush, otherwise bdflush will deadlock if there are too
7912 * many dirty RAID5 blocks.
7915 allow_signal(SIGKILL
);
7916 while (!kthread_should_stop()) {
7918 /* We need to wait INTERRUPTIBLE so that
7919 * we don't add to the load-average.
7920 * That means we need to be sure no signals are
7923 if (signal_pending(current
))
7924 flush_signals(current
);
7926 wait_event_interruptible_timeout
7928 test_bit(THREAD_WAKEUP
, &thread
->flags
)
7929 || kthread_should_stop() || kthread_should_park(),
7932 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
7933 if (kthread_should_park())
7935 if (!kthread_should_stop())
7936 thread
->run(thread
);
7942 void md_wakeup_thread(struct md_thread
*thread
)
7945 pr_debug("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
7946 set_bit(THREAD_WAKEUP
, &thread
->flags
);
7947 wake_up(&thread
->wqueue
);
7950 EXPORT_SYMBOL(md_wakeup_thread
);
7952 struct md_thread
*md_register_thread(void (*run
) (struct md_thread
*),
7953 struct mddev
*mddev
, const char *name
)
7955 struct md_thread
*thread
;
7957 thread
= kzalloc(sizeof(struct md_thread
), GFP_KERNEL
);
7961 init_waitqueue_head(&thread
->wqueue
);
7964 thread
->mddev
= mddev
;
7965 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
7966 thread
->tsk
= kthread_run(md_thread
, thread
,
7968 mdname(thread
->mddev
),
7970 if (IS_ERR(thread
->tsk
)) {
7976 EXPORT_SYMBOL(md_register_thread
);
7978 void md_unregister_thread(struct md_thread
**threadp
)
7980 struct md_thread
*thread
= *threadp
;
7983 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread
->tsk
));
7984 /* Locking ensures that mddev_unlock does not wake_up a
7985 * non-existent thread
7987 spin_lock(&pers_lock
);
7989 spin_unlock(&pers_lock
);
7991 kthread_stop(thread
->tsk
);
7994 EXPORT_SYMBOL(md_unregister_thread
);
7996 void md_error(struct mddev
*mddev
, struct md_rdev
*rdev
)
7998 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
8001 if (!mddev
->pers
|| !mddev
->pers
->error_handler
)
8003 mddev
->pers
->error_handler(mddev
,rdev
);
8004 if (mddev
->degraded
)
8005 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8006 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
8007 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8008 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
8009 md_wakeup_thread(mddev
->thread
);
8010 if (mddev
->event_work
.func
)
8011 queue_work(md_misc_wq
, &mddev
->event_work
);
8012 md_new_event(mddev
);
8014 EXPORT_SYMBOL(md_error
);
8016 /* seq_file implementation /proc/mdstat */
8018 static void status_unused(struct seq_file
*seq
)
8021 struct md_rdev
*rdev
;
8023 seq_printf(seq
, "unused devices: ");
8025 list_for_each_entry(rdev
, &pending_raid_disks
, same_set
) {
8026 char b
[BDEVNAME_SIZE
];
8028 seq_printf(seq
, "%s ",
8029 bdevname(rdev
->bdev
,b
));
8032 seq_printf(seq
, "<none>");
8034 seq_printf(seq
, "\n");
8037 static int status_resync(struct seq_file
*seq
, struct mddev
*mddev
)
8039 sector_t max_sectors
, resync
, res
;
8040 unsigned long dt
, db
= 0;
8041 sector_t rt
, curr_mark_cnt
, resync_mark_cnt
;
8042 int scale
, recovery_active
;
8043 unsigned int per_milli
;
8045 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
8046 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
8047 max_sectors
= mddev
->resync_max_sectors
;
8049 max_sectors
= mddev
->dev_sectors
;
8051 resync
= mddev
->curr_resync
;
8053 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
8054 /* Still cleaning up */
8055 resync
= max_sectors
;
8056 } else if (resync
> max_sectors
)
8057 resync
= max_sectors
;
8059 resync
-= atomic_read(&mddev
->recovery_active
);
8062 if (test_bit(MD_RESYNCING_REMOTE
, &mddev
->recovery
)) {
8063 struct md_rdev
*rdev
;
8065 rdev_for_each(rdev
, mddev
)
8066 if (rdev
->raid_disk
>= 0 &&
8067 !test_bit(Faulty
, &rdev
->flags
) &&
8068 rdev
->recovery_offset
!= MaxSector
&&
8069 rdev
->recovery_offset
) {
8070 seq_printf(seq
, "\trecover=REMOTE");
8073 if (mddev
->reshape_position
!= MaxSector
)
8074 seq_printf(seq
, "\treshape=REMOTE");
8076 seq_printf(seq
, "\tresync=REMOTE");
8079 if (mddev
->recovery_cp
< MaxSector
) {
8080 seq_printf(seq
, "\tresync=PENDING");
8086 seq_printf(seq
, "\tresync=DELAYED");
8090 WARN_ON(max_sectors
== 0);
8091 /* Pick 'scale' such that (resync>>scale)*1000 will fit
8092 * in a sector_t, and (max_sectors>>scale) will fit in a
8093 * u32, as those are the requirements for sector_div.
8094 * Thus 'scale' must be at least 10
8097 if (sizeof(sector_t
) > sizeof(unsigned long)) {
8098 while ( max_sectors
/2 > (1ULL<<(scale
+32)))
8101 res
= (resync
>>scale
)*1000;
8102 sector_div(res
, (u32
)((max_sectors
>>scale
)+1));
8106 int i
, x
= per_milli
/50, y
= 20-x
;
8107 seq_printf(seq
, "[");
8108 for (i
= 0; i
< x
; i
++)
8109 seq_printf(seq
, "=");
8110 seq_printf(seq
, ">");
8111 for (i
= 0; i
< y
; i
++)
8112 seq_printf(seq
, ".");
8113 seq_printf(seq
, "] ");
8115 seq_printf(seq
, " %s =%3u.%u%% (%llu/%llu)",
8116 (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)?
8118 (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)?
8120 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
8121 "resync" : "recovery"))),
8122 per_milli
/10, per_milli
% 10,
8123 (unsigned long long) resync
/2,
8124 (unsigned long long) max_sectors
/2);
8127 * dt: time from mark until now
8128 * db: blocks written from mark until now
8129 * rt: remaining time
8131 * rt is a sector_t, which is always 64bit now. We are keeping
8132 * the original algorithm, but it is not really necessary.
8134 * Original algorithm:
8135 * So we divide before multiply in case it is 32bit and close
8137 * We scale the divisor (db) by 32 to avoid losing precision
8138 * near the end of resync when the number of remaining sectors
8140 * We then divide rt by 32 after multiplying by db to compensate.
8141 * The '+1' avoids division by zero if db is very small.
8143 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
8146 curr_mark_cnt
= mddev
->curr_mark_cnt
;
8147 recovery_active
= atomic_read(&mddev
->recovery_active
);
8148 resync_mark_cnt
= mddev
->resync_mark_cnt
;
8150 if (curr_mark_cnt
>= (recovery_active
+ resync_mark_cnt
))
8151 db
= curr_mark_cnt
- (recovery_active
+ resync_mark_cnt
);
8153 rt
= max_sectors
- resync
; /* number of remaining sectors */
8154 rt
= div64_u64(rt
, db
/32+1);
8158 seq_printf(seq
, " finish=%lu.%lumin", (unsigned long)rt
/ 60,
8159 ((unsigned long)rt
% 60)/6);
8161 seq_printf(seq
, " speed=%ldK/sec", db
/2/dt
);
8165 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
8167 struct list_head
*tmp
;
8169 struct mddev
*mddev
;
8177 spin_lock(&all_mddevs_lock
);
8178 list_for_each(tmp
,&all_mddevs
)
8180 mddev
= list_entry(tmp
, struct mddev
, all_mddevs
);
8182 spin_unlock(&all_mddevs_lock
);
8185 spin_unlock(&all_mddevs_lock
);
8187 return (void*)2;/* tail */
8191 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
8193 struct list_head
*tmp
;
8194 struct mddev
*next_mddev
, *mddev
= v
;
8200 spin_lock(&all_mddevs_lock
);
8202 tmp
= all_mddevs
.next
;
8204 tmp
= mddev
->all_mddevs
.next
;
8205 if (tmp
!= &all_mddevs
)
8206 next_mddev
= mddev_get(list_entry(tmp
,struct mddev
,all_mddevs
));
8208 next_mddev
= (void*)2;
8211 spin_unlock(&all_mddevs_lock
);
8219 static void md_seq_stop(struct seq_file
*seq
, void *v
)
8221 struct mddev
*mddev
= v
;
8223 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
8227 static int md_seq_show(struct seq_file
*seq
, void *v
)
8229 struct mddev
*mddev
= v
;
8231 struct md_rdev
*rdev
;
8233 if (v
== (void*)1) {
8234 struct md_personality
*pers
;
8235 seq_printf(seq
, "Personalities : ");
8236 spin_lock(&pers_lock
);
8237 list_for_each_entry(pers
, &pers_list
, list
)
8238 seq_printf(seq
, "[%s] ", pers
->name
);
8240 spin_unlock(&pers_lock
);
8241 seq_printf(seq
, "\n");
8242 seq
->poll_event
= atomic_read(&md_event_count
);
8245 if (v
== (void*)2) {
8250 spin_lock(&mddev
->lock
);
8251 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
8252 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
8253 mddev
->pers
? "" : "in");
8256 seq_printf(seq
, " (read-only)");
8258 seq_printf(seq
, " (auto-read-only)");
8259 seq_printf(seq
, " %s", mddev
->pers
->name
);
8264 rdev_for_each_rcu(rdev
, mddev
) {
8265 char b
[BDEVNAME_SIZE
];
8266 seq_printf(seq
, " %s[%d]",
8267 bdevname(rdev
->bdev
,b
), rdev
->desc_nr
);
8268 if (test_bit(WriteMostly
, &rdev
->flags
))
8269 seq_printf(seq
, "(W)");
8270 if (test_bit(Journal
, &rdev
->flags
))
8271 seq_printf(seq
, "(J)");
8272 if (test_bit(Faulty
, &rdev
->flags
)) {
8273 seq_printf(seq
, "(F)");
8276 if (rdev
->raid_disk
< 0)
8277 seq_printf(seq
, "(S)"); /* spare */
8278 if (test_bit(Replacement
, &rdev
->flags
))
8279 seq_printf(seq
, "(R)");
8280 sectors
+= rdev
->sectors
;
8284 if (!list_empty(&mddev
->disks
)) {
8286 seq_printf(seq
, "\n %llu blocks",
8287 (unsigned long long)
8288 mddev
->array_sectors
/ 2);
8290 seq_printf(seq
, "\n %llu blocks",
8291 (unsigned long long)sectors
/ 2);
8293 if (mddev
->persistent
) {
8294 if (mddev
->major_version
!= 0 ||
8295 mddev
->minor_version
!= 90) {
8296 seq_printf(seq
," super %d.%d",
8297 mddev
->major_version
,
8298 mddev
->minor_version
);
8300 } else if (mddev
->external
)
8301 seq_printf(seq
, " super external:%s",
8302 mddev
->metadata_type
);
8304 seq_printf(seq
, " super non-persistent");
8307 mddev
->pers
->status(seq
, mddev
);
8308 seq_printf(seq
, "\n ");
8309 if (mddev
->pers
->sync_request
) {
8310 if (status_resync(seq
, mddev
))
8311 seq_printf(seq
, "\n ");
8314 seq_printf(seq
, "\n ");
8316 md_bitmap_status(seq
, mddev
->bitmap
);
8318 seq_printf(seq
, "\n");
8320 spin_unlock(&mddev
->lock
);
8325 static const struct seq_operations md_seq_ops
= {
8326 .start
= md_seq_start
,
8327 .next
= md_seq_next
,
8328 .stop
= md_seq_stop
,
8329 .show
= md_seq_show
,
8332 static int md_seq_open(struct inode
*inode
, struct file
*file
)
8334 struct seq_file
*seq
;
8337 error
= seq_open(file
, &md_seq_ops
);
8341 seq
= file
->private_data
;
8342 seq
->poll_event
= atomic_read(&md_event_count
);
8346 static int md_unloading
;
8347 static __poll_t
mdstat_poll(struct file
*filp
, poll_table
*wait
)
8349 struct seq_file
*seq
= filp
->private_data
;
8353 return EPOLLIN
|EPOLLRDNORM
|EPOLLERR
|EPOLLPRI
;
8354 poll_wait(filp
, &md_event_waiters
, wait
);
8356 /* always allow read */
8357 mask
= EPOLLIN
| EPOLLRDNORM
;
8359 if (seq
->poll_event
!= atomic_read(&md_event_count
))
8360 mask
|= EPOLLERR
| EPOLLPRI
;
8364 static const struct proc_ops mdstat_proc_ops
= {
8365 .proc_open
= md_seq_open
,
8366 .proc_read
= seq_read
,
8367 .proc_lseek
= seq_lseek
,
8368 .proc_release
= seq_release
,
8369 .proc_poll
= mdstat_poll
,
8372 int register_md_personality(struct md_personality
*p
)
8374 pr_debug("md: %s personality registered for level %d\n",
8376 spin_lock(&pers_lock
);
8377 list_add_tail(&p
->list
, &pers_list
);
8378 spin_unlock(&pers_lock
);
8381 EXPORT_SYMBOL(register_md_personality
);
8383 int unregister_md_personality(struct md_personality
*p
)
8385 pr_debug("md: %s personality unregistered\n", p
->name
);
8386 spin_lock(&pers_lock
);
8387 list_del_init(&p
->list
);
8388 spin_unlock(&pers_lock
);
8391 EXPORT_SYMBOL(unregister_md_personality
);
8393 int register_md_cluster_operations(struct md_cluster_operations
*ops
,
8394 struct module
*module
)
8397 spin_lock(&pers_lock
);
8398 if (md_cluster_ops
!= NULL
)
8401 md_cluster_ops
= ops
;
8402 md_cluster_mod
= module
;
8404 spin_unlock(&pers_lock
);
8407 EXPORT_SYMBOL(register_md_cluster_operations
);
8409 int unregister_md_cluster_operations(void)
8411 spin_lock(&pers_lock
);
8412 md_cluster_ops
= NULL
;
8413 spin_unlock(&pers_lock
);
8416 EXPORT_SYMBOL(unregister_md_cluster_operations
);
8418 int md_setup_cluster(struct mddev
*mddev
, int nodes
)
8421 if (!md_cluster_ops
)
8422 request_module("md-cluster");
8423 spin_lock(&pers_lock
);
8424 /* ensure module won't be unloaded */
8425 if (!md_cluster_ops
|| !try_module_get(md_cluster_mod
)) {
8426 pr_warn("can't find md-cluster module or get it's reference.\n");
8427 spin_unlock(&pers_lock
);
8430 spin_unlock(&pers_lock
);
8432 ret
= md_cluster_ops
->join(mddev
, nodes
);
8434 mddev
->safemode_delay
= 0;
8438 void md_cluster_stop(struct mddev
*mddev
)
8440 if (!md_cluster_ops
)
8442 md_cluster_ops
->leave(mddev
);
8443 module_put(md_cluster_mod
);
8446 static int is_mddev_idle(struct mddev
*mddev
, int init
)
8448 struct md_rdev
*rdev
;
8454 rdev_for_each_rcu(rdev
, mddev
) {
8455 struct gendisk
*disk
= rdev
->bdev
->bd_disk
;
8456 curr_events
= (int)part_stat_read_accum(disk
->part0
, sectors
) -
8457 atomic_read(&disk
->sync_io
);
8458 /* sync IO will cause sync_io to increase before the disk_stats
8459 * as sync_io is counted when a request starts, and
8460 * disk_stats is counted when it completes.
8461 * So resync activity will cause curr_events to be smaller than
8462 * when there was no such activity.
8463 * non-sync IO will cause disk_stat to increase without
8464 * increasing sync_io so curr_events will (eventually)
8465 * be larger than it was before. Once it becomes
8466 * substantially larger, the test below will cause
8467 * the array to appear non-idle, and resync will slow
8469 * If there is a lot of outstanding resync activity when
8470 * we set last_event to curr_events, then all that activity
8471 * completing might cause the array to appear non-idle
8472 * and resync will be slowed down even though there might
8473 * not have been non-resync activity. This will only
8474 * happen once though. 'last_events' will soon reflect
8475 * the state where there is little or no outstanding
8476 * resync requests, and further resync activity will
8477 * always make curr_events less than last_events.
8480 if (init
|| curr_events
- rdev
->last_events
> 64) {
8481 rdev
->last_events
= curr_events
;
8489 void md_done_sync(struct mddev
*mddev
, int blocks
, int ok
)
8491 /* another "blocks" (512byte) blocks have been synced */
8492 atomic_sub(blocks
, &mddev
->recovery_active
);
8493 wake_up(&mddev
->recovery_wait
);
8495 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8496 set_bit(MD_RECOVERY_ERROR
, &mddev
->recovery
);
8497 md_wakeup_thread(mddev
->thread
);
8498 // stop recovery, signal do_sync ....
8501 EXPORT_SYMBOL(md_done_sync
);
8503 /* md_write_start(mddev, bi)
8504 * If we need to update some array metadata (e.g. 'active' flag
8505 * in superblock) before writing, schedule a superblock update
8506 * and wait for it to complete.
8507 * A return value of 'false' means that the write wasn't recorded
8508 * and cannot proceed as the array is being suspend.
8510 bool md_write_start(struct mddev
*mddev
, struct bio
*bi
)
8514 if (bio_data_dir(bi
) != WRITE
)
8517 BUG_ON(mddev
->ro
== 1);
8518 if (mddev
->ro
== 2) {
8519 /* need to switch to read/write */
8521 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
8522 md_wakeup_thread(mddev
->thread
);
8523 md_wakeup_thread(mddev
->sync_thread
);
8527 percpu_ref_get(&mddev
->writes_pending
);
8528 smp_mb(); /* Match smp_mb in set_in_sync() */
8529 if (mddev
->safemode
== 1)
8530 mddev
->safemode
= 0;
8531 /* sync_checkers is always 0 when writes_pending is in per-cpu mode */
8532 if (mddev
->in_sync
|| mddev
->sync_checkers
) {
8533 spin_lock(&mddev
->lock
);
8534 if (mddev
->in_sync
) {
8536 set_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
8537 set_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
8538 md_wakeup_thread(mddev
->thread
);
8541 spin_unlock(&mddev
->lock
);
8545 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
8546 if (!mddev
->has_superblocks
)
8548 wait_event(mddev
->sb_wait
,
8549 !test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
) ||
8551 if (test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
)) {
8552 percpu_ref_put(&mddev
->writes_pending
);
8557 EXPORT_SYMBOL(md_write_start
);
8559 /* md_write_inc can only be called when md_write_start() has
8560 * already been called at least once of the current request.
8561 * It increments the counter and is useful when a single request
8562 * is split into several parts. Each part causes an increment and
8563 * so needs a matching md_write_end().
8564 * Unlike md_write_start(), it is safe to call md_write_inc() inside
8565 * a spinlocked region.
8567 void md_write_inc(struct mddev
*mddev
, struct bio
*bi
)
8569 if (bio_data_dir(bi
) != WRITE
)
8571 WARN_ON_ONCE(mddev
->in_sync
|| mddev
->ro
);
8572 percpu_ref_get(&mddev
->writes_pending
);
8574 EXPORT_SYMBOL(md_write_inc
);
8576 void md_write_end(struct mddev
*mddev
)
8578 percpu_ref_put(&mddev
->writes_pending
);
8580 if (mddev
->safemode
== 2)
8581 md_wakeup_thread(mddev
->thread
);
8582 else if (mddev
->safemode_delay
)
8583 /* The roundup() ensures this only performs locking once
8584 * every ->safemode_delay jiffies
8586 mod_timer(&mddev
->safemode_timer
,
8587 roundup(jiffies
, mddev
->safemode_delay
) +
8588 mddev
->safemode_delay
);
8591 EXPORT_SYMBOL(md_write_end
);
8593 /* md_allow_write(mddev)
8594 * Calling this ensures that the array is marked 'active' so that writes
8595 * may proceed without blocking. It is important to call this before
8596 * attempting a GFP_KERNEL allocation while holding the mddev lock.
8597 * Must be called with mddev_lock held.
8599 void md_allow_write(struct mddev
*mddev
)
8605 if (!mddev
->pers
->sync_request
)
8608 spin_lock(&mddev
->lock
);
8609 if (mddev
->in_sync
) {
8611 set_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
8612 set_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
8613 if (mddev
->safemode_delay
&&
8614 mddev
->safemode
== 0)
8615 mddev
->safemode
= 1;
8616 spin_unlock(&mddev
->lock
);
8617 md_update_sb(mddev
, 0);
8618 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
8619 /* wait for the dirty state to be recorded in the metadata */
8620 wait_event(mddev
->sb_wait
,
8621 !test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
));
8623 spin_unlock(&mddev
->lock
);
8625 EXPORT_SYMBOL_GPL(md_allow_write
);
8627 #define SYNC_MARKS 10
8628 #define SYNC_MARK_STEP (3*HZ)
8629 #define UPDATE_FREQUENCY (5*60*HZ)
8630 void md_do_sync(struct md_thread
*thread
)
8632 struct mddev
*mddev
= thread
->mddev
;
8633 struct mddev
*mddev2
;
8634 unsigned int currspeed
= 0, window
;
8635 sector_t max_sectors
,j
, io_sectors
, recovery_done
;
8636 unsigned long mark
[SYNC_MARKS
];
8637 unsigned long update_time
;
8638 sector_t mark_cnt
[SYNC_MARKS
];
8640 struct list_head
*tmp
;
8641 sector_t last_check
;
8643 struct md_rdev
*rdev
;
8644 char *desc
, *action
= NULL
;
8645 struct blk_plug plug
;
8648 /* just incase thread restarts... */
8649 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
8650 test_bit(MD_RECOVERY_WAIT
, &mddev
->recovery
))
8652 if (mddev
->ro
) {/* never try to sync a read-only array */
8653 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8657 if (mddev_is_clustered(mddev
)) {
8658 ret
= md_cluster_ops
->resync_start(mddev
);
8662 set_bit(MD_CLUSTER_RESYNC_LOCKED
, &mddev
->flags
);
8663 if (!(test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
8664 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) ||
8665 test_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
))
8666 && ((unsigned long long)mddev
->curr_resync_completed
8667 < (unsigned long long)mddev
->resync_max_sectors
))
8671 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
8672 if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)) {
8673 desc
= "data-check";
8675 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
8676 desc
= "requested-resync";
8680 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
8685 mddev
->last_sync_action
= action
?: desc
;
8687 /* we overload curr_resync somewhat here.
8688 * 0 == not engaged in resync at all
8689 * 2 == checking that there is no conflict with another sync
8690 * 1 == like 2, but have yielded to allow conflicting resync to
8692 * other == active in resync - this many blocks
8694 * Before starting a resync we must have set curr_resync to
8695 * 2, and then checked that every "conflicting" array has curr_resync
8696 * less than ours. When we find one that is the same or higher
8697 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
8698 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
8699 * This will mean we have to start checking from the beginning again.
8704 int mddev2_minor
= -1;
8705 mddev
->curr_resync
= 2;
8708 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
8710 for_each_mddev(mddev2
, tmp
) {
8711 if (mddev2
== mddev
)
8713 if (!mddev
->parallel_resync
8714 && mddev2
->curr_resync
8715 && match_mddev_units(mddev
, mddev2
)) {
8717 if (mddev
< mddev2
&& mddev
->curr_resync
== 2) {
8718 /* arbitrarily yield */
8719 mddev
->curr_resync
= 1;
8720 wake_up(&resync_wait
);
8722 if (mddev
> mddev2
&& mddev
->curr_resync
== 1)
8723 /* no need to wait here, we can wait the next
8724 * time 'round when curr_resync == 2
8727 /* We need to wait 'interruptible' so as not to
8728 * contribute to the load average, and not to
8729 * be caught by 'softlockup'
8731 prepare_to_wait(&resync_wait
, &wq
, TASK_INTERRUPTIBLE
);
8732 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
8733 mddev2
->curr_resync
>= mddev
->curr_resync
) {
8734 if (mddev2_minor
!= mddev2
->md_minor
) {
8735 mddev2_minor
= mddev2
->md_minor
;
8736 pr_info("md: delaying %s of %s until %s has finished (they share one or more physical units)\n",
8737 desc
, mdname(mddev
),
8741 if (signal_pending(current
))
8742 flush_signals(current
);
8744 finish_wait(&resync_wait
, &wq
);
8747 finish_wait(&resync_wait
, &wq
);
8750 } while (mddev
->curr_resync
< 2);
8753 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
8754 /* resync follows the size requested by the personality,
8755 * which defaults to physical size, but can be virtual size
8757 max_sectors
= mddev
->resync_max_sectors
;
8758 atomic64_set(&mddev
->resync_mismatches
, 0);
8759 /* we don't use the checkpoint if there's a bitmap */
8760 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
8761 j
= mddev
->resync_min
;
8762 else if (!mddev
->bitmap
)
8763 j
= mddev
->recovery_cp
;
8765 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)) {
8766 max_sectors
= mddev
->resync_max_sectors
;
8768 * If the original node aborts reshaping then we continue the
8769 * reshaping, so set j again to avoid restart reshape from the
8772 if (mddev_is_clustered(mddev
) &&
8773 mddev
->reshape_position
!= MaxSector
)
8774 j
= mddev
->reshape_position
;
8776 /* recovery follows the physical size of devices */
8777 max_sectors
= mddev
->dev_sectors
;
8780 rdev_for_each_rcu(rdev
, mddev
)
8781 if (rdev
->raid_disk
>= 0 &&
8782 !test_bit(Journal
, &rdev
->flags
) &&
8783 !test_bit(Faulty
, &rdev
->flags
) &&
8784 !test_bit(In_sync
, &rdev
->flags
) &&
8785 rdev
->recovery_offset
< j
)
8786 j
= rdev
->recovery_offset
;
8789 /* If there is a bitmap, we need to make sure all
8790 * writes that started before we added a spare
8791 * complete before we start doing a recovery.
8792 * Otherwise the write might complete and (via
8793 * bitmap_endwrite) set a bit in the bitmap after the
8794 * recovery has checked that bit and skipped that
8797 if (mddev
->bitmap
) {
8798 mddev
->pers
->quiesce(mddev
, 1);
8799 mddev
->pers
->quiesce(mddev
, 0);
8803 pr_info("md: %s of RAID array %s\n", desc
, mdname(mddev
));
8804 pr_debug("md: minimum _guaranteed_ speed: %d KB/sec/disk.\n", speed_min(mddev
));
8805 pr_debug("md: using maximum available idle IO bandwidth (but not more than %d KB/sec) for %s.\n",
8806 speed_max(mddev
), desc
);
8808 is_mddev_idle(mddev
, 1); /* this initializes IO event counters */
8811 for (m
= 0; m
< SYNC_MARKS
; m
++) {
8813 mark_cnt
[m
] = io_sectors
;
8816 mddev
->resync_mark
= mark
[last_mark
];
8817 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
8820 * Tune reconstruction:
8822 window
= 32 * (PAGE_SIZE
/ 512);
8823 pr_debug("md: using %dk window, over a total of %lluk.\n",
8824 window
/2, (unsigned long long)max_sectors
/2);
8826 atomic_set(&mddev
->recovery_active
, 0);
8830 pr_debug("md: resuming %s of %s from checkpoint.\n",
8831 desc
, mdname(mddev
));
8832 mddev
->curr_resync
= j
;
8834 mddev
->curr_resync
= 3; /* no longer delayed */
8835 mddev
->curr_resync_completed
= j
;
8836 sysfs_notify_dirent_safe(mddev
->sysfs_completed
);
8837 md_new_event(mddev
);
8838 update_time
= jiffies
;
8840 blk_start_plug(&plug
);
8841 while (j
< max_sectors
) {
8846 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
8847 ((mddev
->curr_resync
> mddev
->curr_resync_completed
&&
8848 (mddev
->curr_resync
- mddev
->curr_resync_completed
)
8849 > (max_sectors
>> 4)) ||
8850 time_after_eq(jiffies
, update_time
+ UPDATE_FREQUENCY
) ||
8851 (j
- mddev
->curr_resync_completed
)*2
8852 >= mddev
->resync_max
- mddev
->curr_resync_completed
||
8853 mddev
->curr_resync_completed
> mddev
->resync_max
8855 /* time to update curr_resync_completed */
8856 wait_event(mddev
->recovery_wait
,
8857 atomic_read(&mddev
->recovery_active
) == 0);
8858 mddev
->curr_resync_completed
= j
;
8859 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) &&
8860 j
> mddev
->recovery_cp
)
8861 mddev
->recovery_cp
= j
;
8862 update_time
= jiffies
;
8863 set_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
8864 sysfs_notify_dirent_safe(mddev
->sysfs_completed
);
8867 while (j
>= mddev
->resync_max
&&
8868 !test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
8869 /* As this condition is controlled by user-space,
8870 * we can block indefinitely, so use '_interruptible'
8871 * to avoid triggering warnings.
8873 flush_signals(current
); /* just in case */
8874 wait_event_interruptible(mddev
->recovery_wait
,
8875 mddev
->resync_max
> j
8876 || test_bit(MD_RECOVERY_INTR
,
8880 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
8883 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
);
8885 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8889 if (!skipped
) { /* actual IO requested */
8890 io_sectors
+= sectors
;
8891 atomic_add(sectors
, &mddev
->recovery_active
);
8894 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
8898 if (j
> max_sectors
)
8899 /* when skipping, extra large numbers can be returned. */
8902 mddev
->curr_resync
= j
;
8903 mddev
->curr_mark_cnt
= io_sectors
;
8904 if (last_check
== 0)
8905 /* this is the earliest that rebuild will be
8906 * visible in /proc/mdstat
8908 md_new_event(mddev
);
8910 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
8913 last_check
= io_sectors
;
8915 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
8917 int next
= (last_mark
+1) % SYNC_MARKS
;
8919 mddev
->resync_mark
= mark
[next
];
8920 mddev
->resync_mark_cnt
= mark_cnt
[next
];
8921 mark
[next
] = jiffies
;
8922 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
8926 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
8930 * this loop exits only if either when we are slower than
8931 * the 'hard' speed limit, or the system was IO-idle for
8933 * the system might be non-idle CPU-wise, but we only care
8934 * about not overloading the IO subsystem. (things like an
8935 * e2fsck being done on the RAID array should execute fast)
8939 recovery_done
= io_sectors
- atomic_read(&mddev
->recovery_active
);
8940 currspeed
= ((unsigned long)(recovery_done
- mddev
->resync_mark_cnt
))/2
8941 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
8943 if (currspeed
> speed_min(mddev
)) {
8944 if (currspeed
> speed_max(mddev
)) {
8948 if (!is_mddev_idle(mddev
, 0)) {
8950 * Give other IO more of a chance.
8951 * The faster the devices, the less we wait.
8953 wait_event(mddev
->recovery_wait
,
8954 !atomic_read(&mddev
->recovery_active
));
8958 pr_info("md: %s: %s %s.\n",mdname(mddev
), desc
,
8959 test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)
8960 ? "interrupted" : "done");
8962 * this also signals 'finished resyncing' to md_stop
8964 blk_finish_plug(&plug
);
8965 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
8967 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
8968 !test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
8969 mddev
->curr_resync
> 3) {
8970 mddev
->curr_resync_completed
= mddev
->curr_resync
;
8971 sysfs_notify_dirent_safe(mddev
->sysfs_completed
);
8973 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
);
8975 if (!test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
) &&
8976 mddev
->curr_resync
> 3) {
8977 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
8978 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
8979 if (mddev
->curr_resync
>= mddev
->recovery_cp
) {
8980 pr_debug("md: checkpointing %s of %s.\n",
8981 desc
, mdname(mddev
));
8982 if (test_bit(MD_RECOVERY_ERROR
,
8984 mddev
->recovery_cp
=
8985 mddev
->curr_resync_completed
;
8987 mddev
->recovery_cp
=
8991 mddev
->recovery_cp
= MaxSector
;
8993 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
8994 mddev
->curr_resync
= MaxSector
;
8995 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
8996 test_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
)) {
8998 rdev_for_each_rcu(rdev
, mddev
)
8999 if (rdev
->raid_disk
>= 0 &&
9000 mddev
->delta_disks
>= 0 &&
9001 !test_bit(Journal
, &rdev
->flags
) &&
9002 !test_bit(Faulty
, &rdev
->flags
) &&
9003 !test_bit(In_sync
, &rdev
->flags
) &&
9004 rdev
->recovery_offset
< mddev
->curr_resync
)
9005 rdev
->recovery_offset
= mddev
->curr_resync
;
9011 /* set CHANGE_PENDING here since maybe another update is needed,
9012 * so other nodes are informed. It should be harmless for normal
9014 set_mask_bits(&mddev
->sb_flags
, 0,
9015 BIT(MD_SB_CHANGE_PENDING
) | BIT(MD_SB_CHANGE_DEVS
));
9017 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
9018 !test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
9019 mddev
->delta_disks
> 0 &&
9020 mddev
->pers
->finish_reshape
&&
9021 mddev
->pers
->size
&&
9023 mddev_lock_nointr(mddev
);
9024 md_set_array_sectors(mddev
, mddev
->pers
->size(mddev
, 0, 0));
9025 mddev_unlock(mddev
);
9026 if (!mddev_is_clustered(mddev
))
9027 set_capacity_and_notify(mddev
->gendisk
,
9028 mddev
->array_sectors
);
9031 spin_lock(&mddev
->lock
);
9032 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
9033 /* We completed so min/max setting can be forgotten if used. */
9034 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
9035 mddev
->resync_min
= 0;
9036 mddev
->resync_max
= MaxSector
;
9037 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
9038 mddev
->resync_min
= mddev
->curr_resync_completed
;
9039 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
9040 mddev
->curr_resync
= 0;
9041 spin_unlock(&mddev
->lock
);
9043 wake_up(&resync_wait
);
9044 md_wakeup_thread(mddev
->thread
);
9047 EXPORT_SYMBOL_GPL(md_do_sync
);
9049 static int remove_and_add_spares(struct mddev
*mddev
,
9050 struct md_rdev
*this)
9052 struct md_rdev
*rdev
;
9055 bool remove_some
= false;
9057 if (this && test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
9058 /* Mustn't remove devices when resync thread is running */
9061 rdev_for_each(rdev
, mddev
) {
9062 if ((this == NULL
|| rdev
== this) &&
9063 rdev
->raid_disk
>= 0 &&
9064 !test_bit(Blocked
, &rdev
->flags
) &&
9065 test_bit(Faulty
, &rdev
->flags
) &&
9066 atomic_read(&rdev
->nr_pending
)==0) {
9067 /* Faulty non-Blocked devices with nr_pending == 0
9068 * never get nr_pending incremented,
9069 * never get Faulty cleared, and never get Blocked set.
9070 * So we can synchronize_rcu now rather than once per device
9073 set_bit(RemoveSynchronized
, &rdev
->flags
);
9079 rdev_for_each(rdev
, mddev
) {
9080 if ((this == NULL
|| rdev
== this) &&
9081 rdev
->raid_disk
>= 0 &&
9082 !test_bit(Blocked
, &rdev
->flags
) &&
9083 ((test_bit(RemoveSynchronized
, &rdev
->flags
) ||
9084 (!test_bit(In_sync
, &rdev
->flags
) &&
9085 !test_bit(Journal
, &rdev
->flags
))) &&
9086 atomic_read(&rdev
->nr_pending
)==0)) {
9087 if (mddev
->pers
->hot_remove_disk(
9088 mddev
, rdev
) == 0) {
9089 sysfs_unlink_rdev(mddev
, rdev
);
9090 rdev
->saved_raid_disk
= rdev
->raid_disk
;
9091 rdev
->raid_disk
= -1;
9095 if (remove_some
&& test_bit(RemoveSynchronized
, &rdev
->flags
))
9096 clear_bit(RemoveSynchronized
, &rdev
->flags
);
9099 if (removed
&& mddev
->kobj
.sd
)
9100 sysfs_notify_dirent_safe(mddev
->sysfs_degraded
);
9102 if (this && removed
)
9105 rdev_for_each(rdev
, mddev
) {
9106 if (this && this != rdev
)
9108 if (test_bit(Candidate
, &rdev
->flags
))
9110 if (rdev
->raid_disk
>= 0 &&
9111 !test_bit(In_sync
, &rdev
->flags
) &&
9112 !test_bit(Journal
, &rdev
->flags
) &&
9113 !test_bit(Faulty
, &rdev
->flags
))
9115 if (rdev
->raid_disk
>= 0)
9117 if (test_bit(Faulty
, &rdev
->flags
))
9119 if (!test_bit(Journal
, &rdev
->flags
)) {
9121 ! (rdev
->saved_raid_disk
>= 0 &&
9122 !test_bit(Bitmap_sync
, &rdev
->flags
)))
9125 rdev
->recovery_offset
= 0;
9127 if (mddev
->pers
->hot_add_disk(mddev
, rdev
) == 0) {
9128 /* failure here is OK */
9129 sysfs_link_rdev(mddev
, rdev
);
9130 if (!test_bit(Journal
, &rdev
->flags
))
9132 md_new_event(mddev
);
9133 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
9138 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
9142 static void md_start_sync(struct work_struct
*ws
)
9144 struct mddev
*mddev
= container_of(ws
, struct mddev
, del_work
);
9146 mddev
->sync_thread
= md_register_thread(md_do_sync
,
9149 if (!mddev
->sync_thread
) {
9150 pr_warn("%s: could not start resync thread...\n",
9152 /* leave the spares where they are, it shouldn't hurt */
9153 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
9154 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
9155 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
9156 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
9157 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
9158 wake_up(&resync_wait
);
9159 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
9161 if (mddev
->sysfs_action
)
9162 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
9164 md_wakeup_thread(mddev
->sync_thread
);
9165 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
9166 md_new_event(mddev
);
9170 * This routine is regularly called by all per-raid-array threads to
9171 * deal with generic issues like resync and super-block update.
9172 * Raid personalities that don't have a thread (linear/raid0) do not
9173 * need this as they never do any recovery or update the superblock.
9175 * It does not do any resync itself, but rather "forks" off other threads
9176 * to do that as needed.
9177 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
9178 * "->recovery" and create a thread at ->sync_thread.
9179 * When the thread finishes it sets MD_RECOVERY_DONE
9180 * and wakeups up this thread which will reap the thread and finish up.
9181 * This thread also removes any faulty devices (with nr_pending == 0).
9183 * The overall approach is:
9184 * 1/ if the superblock needs updating, update it.
9185 * 2/ If a recovery thread is running, don't do anything else.
9186 * 3/ If recovery has finished, clean up, possibly marking spares active.
9187 * 4/ If there are any faulty devices, remove them.
9188 * 5/ If array is degraded, try to add spares devices
9189 * 6/ If array has spares or is not in-sync, start a resync thread.
9191 void md_check_recovery(struct mddev
*mddev
)
9193 if (test_bit(MD_ALLOW_SB_UPDATE
, &mddev
->flags
) && mddev
->sb_flags
) {
9194 /* Write superblock - thread that called mddev_suspend()
9195 * holds reconfig_mutex for us.
9197 set_bit(MD_UPDATING_SB
, &mddev
->flags
);
9198 smp_mb__after_atomic();
9199 if (test_bit(MD_ALLOW_SB_UPDATE
, &mddev
->flags
))
9200 md_update_sb(mddev
, 0);
9201 clear_bit_unlock(MD_UPDATING_SB
, &mddev
->flags
);
9202 wake_up(&mddev
->sb_wait
);
9205 if (mddev
->suspended
)
9209 md_bitmap_daemon_work(mddev
);
9211 if (signal_pending(current
)) {
9212 if (mddev
->pers
->sync_request
&& !mddev
->external
) {
9213 pr_debug("md: %s in immediate safe mode\n",
9215 mddev
->safemode
= 2;
9217 flush_signals(current
);
9220 if (mddev
->ro
&& !test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
9223 (mddev
->sb_flags
& ~ (1<<MD_SB_CHANGE_PENDING
)) ||
9224 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
9225 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
9226 (mddev
->external
== 0 && mddev
->safemode
== 1) ||
9227 (mddev
->safemode
== 2
9228 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
9232 if (mddev_trylock(mddev
)) {
9234 bool try_set_sync
= mddev
->safemode
!= 0;
9236 if (!mddev
->external
&& mddev
->safemode
== 1)
9237 mddev
->safemode
= 0;
9240 struct md_rdev
*rdev
;
9241 if (!mddev
->external
&& mddev
->in_sync
)
9242 /* 'Blocked' flag not needed as failed devices
9243 * will be recorded if array switched to read/write.
9244 * Leaving it set will prevent the device
9245 * from being removed.
9247 rdev_for_each(rdev
, mddev
)
9248 clear_bit(Blocked
, &rdev
->flags
);
9249 /* On a read-only array we can:
9250 * - remove failed devices
9251 * - add already-in_sync devices if the array itself
9253 * As we only add devices that are already in-sync,
9254 * we can activate the spares immediately.
9256 remove_and_add_spares(mddev
, NULL
);
9257 /* There is no thread, but we need to call
9258 * ->spare_active and clear saved_raid_disk
9260 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
9261 md_reap_sync_thread(mddev
);
9262 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
9263 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
9264 clear_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
9268 if (mddev_is_clustered(mddev
)) {
9269 struct md_rdev
*rdev
;
9270 /* kick the device if another node issued a
9273 rdev_for_each(rdev
, mddev
) {
9274 if (test_and_clear_bit(ClusterRemove
, &rdev
->flags
) &&
9275 rdev
->raid_disk
< 0)
9276 md_kick_rdev_from_array(rdev
);
9280 if (try_set_sync
&& !mddev
->external
&& !mddev
->in_sync
) {
9281 spin_lock(&mddev
->lock
);
9283 spin_unlock(&mddev
->lock
);
9286 if (mddev
->sb_flags
)
9287 md_update_sb(mddev
, 0);
9289 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
9290 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
9291 /* resync/recovery still happening */
9292 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
9295 if (mddev
->sync_thread
) {
9296 md_reap_sync_thread(mddev
);
9299 /* Set RUNNING before clearing NEEDED to avoid
9300 * any transients in the value of "sync_action".
9302 mddev
->curr_resync_completed
= 0;
9303 spin_lock(&mddev
->lock
);
9304 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
9305 spin_unlock(&mddev
->lock
);
9306 /* Clear some bits that don't mean anything, but
9309 clear_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
9310 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
9312 if (!test_and_clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
9313 test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
9315 /* no recovery is running.
9316 * remove any failed drives, then
9317 * add spares if possible.
9318 * Spares are also removed and re-added, to allow
9319 * the personality to fail the re-add.
9322 if (mddev
->reshape_position
!= MaxSector
) {
9323 if (mddev
->pers
->check_reshape
== NULL
||
9324 mddev
->pers
->check_reshape(mddev
) != 0)
9325 /* Cannot proceed */
9327 set_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
9328 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
9329 } else if ((spares
= remove_and_add_spares(mddev
, NULL
))) {
9330 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
9331 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
9332 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
9333 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
9334 } else if (mddev
->recovery_cp
< MaxSector
) {
9335 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
9336 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
9337 } else if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
9338 /* nothing to be done ... */
9341 if (mddev
->pers
->sync_request
) {
9343 /* We are adding a device or devices to an array
9344 * which has the bitmap stored on all devices.
9345 * So make sure all bitmap pages get written
9347 md_bitmap_write_all(mddev
->bitmap
);
9349 INIT_WORK(&mddev
->del_work
, md_start_sync
);
9350 queue_work(md_misc_wq
, &mddev
->del_work
);
9354 if (!mddev
->sync_thread
) {
9355 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
9356 wake_up(&resync_wait
);
9357 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
9359 if (mddev
->sysfs_action
)
9360 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
9363 wake_up(&mddev
->sb_wait
);
9364 mddev_unlock(mddev
);
9367 EXPORT_SYMBOL(md_check_recovery
);
9369 void md_reap_sync_thread(struct mddev
*mddev
)
9371 struct md_rdev
*rdev
;
9372 sector_t old_dev_sectors
= mddev
->dev_sectors
;
9373 bool is_reshaped
= false;
9375 /* resync has finished, collect result */
9376 md_unregister_thread(&mddev
->sync_thread
);
9377 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
9378 !test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
) &&
9379 mddev
->degraded
!= mddev
->raid_disks
) {
9381 /* activate any spares */
9382 if (mddev
->pers
->spare_active(mddev
)) {
9383 sysfs_notify_dirent_safe(mddev
->sysfs_degraded
);
9384 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
9387 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
9388 mddev
->pers
->finish_reshape
) {
9389 mddev
->pers
->finish_reshape(mddev
);
9390 if (mddev_is_clustered(mddev
))
9394 /* If array is no-longer degraded, then any saved_raid_disk
9395 * information must be scrapped.
9397 if (!mddev
->degraded
)
9398 rdev_for_each(rdev
, mddev
)
9399 rdev
->saved_raid_disk
= -1;
9401 md_update_sb(mddev
, 1);
9402 /* MD_SB_CHANGE_PENDING should be cleared by md_update_sb, so we can
9403 * call resync_finish here if MD_CLUSTER_RESYNC_LOCKED is set by
9405 if (test_and_clear_bit(MD_CLUSTER_RESYNC_LOCKED
, &mddev
->flags
))
9406 md_cluster_ops
->resync_finish(mddev
);
9407 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
9408 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
9409 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
9410 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
9411 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
9412 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
9414 * We call md_cluster_ops->update_size here because sync_size could
9415 * be changed by md_update_sb, and MD_RECOVERY_RESHAPE is cleared,
9416 * so it is time to update size across cluster.
9418 if (mddev_is_clustered(mddev
) && is_reshaped
9419 && !test_bit(MD_CLOSING
, &mddev
->flags
))
9420 md_cluster_ops
->update_size(mddev
, old_dev_sectors
);
9421 wake_up(&resync_wait
);
9422 /* flag recovery needed just to double check */
9423 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
9424 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
9425 md_new_event(mddev
);
9426 if (mddev
->event_work
.func
)
9427 queue_work(md_misc_wq
, &mddev
->event_work
);
9429 EXPORT_SYMBOL(md_reap_sync_thread
);
9431 void md_wait_for_blocked_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
9433 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
9434 wait_event_timeout(rdev
->blocked_wait
,
9435 !test_bit(Blocked
, &rdev
->flags
) &&
9436 !test_bit(BlockedBadBlocks
, &rdev
->flags
),
9437 msecs_to_jiffies(5000));
9438 rdev_dec_pending(rdev
, mddev
);
9440 EXPORT_SYMBOL(md_wait_for_blocked_rdev
);
9442 void md_finish_reshape(struct mddev
*mddev
)
9444 /* called be personality module when reshape completes. */
9445 struct md_rdev
*rdev
;
9447 rdev_for_each(rdev
, mddev
) {
9448 if (rdev
->data_offset
> rdev
->new_data_offset
)
9449 rdev
->sectors
+= rdev
->data_offset
- rdev
->new_data_offset
;
9451 rdev
->sectors
-= rdev
->new_data_offset
- rdev
->data_offset
;
9452 rdev
->data_offset
= rdev
->new_data_offset
;
9455 EXPORT_SYMBOL(md_finish_reshape
);
9457 /* Bad block management */
9459 /* Returns 1 on success, 0 on failure */
9460 int rdev_set_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
9463 struct mddev
*mddev
= rdev
->mddev
;
9466 s
+= rdev
->new_data_offset
;
9468 s
+= rdev
->data_offset
;
9469 rv
= badblocks_set(&rdev
->badblocks
, s
, sectors
, 0);
9471 /* Make sure they get written out promptly */
9472 if (test_bit(ExternalBbl
, &rdev
->flags
))
9473 sysfs_notify_dirent_safe(rdev
->sysfs_unack_badblocks
);
9474 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
9475 set_mask_bits(&mddev
->sb_flags
, 0,
9476 BIT(MD_SB_CHANGE_CLEAN
) | BIT(MD_SB_CHANGE_PENDING
));
9477 md_wakeup_thread(rdev
->mddev
->thread
);
9482 EXPORT_SYMBOL_GPL(rdev_set_badblocks
);
9484 int rdev_clear_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
9489 s
+= rdev
->new_data_offset
;
9491 s
+= rdev
->data_offset
;
9492 rv
= badblocks_clear(&rdev
->badblocks
, s
, sectors
);
9493 if ((rv
== 0) && test_bit(ExternalBbl
, &rdev
->flags
))
9494 sysfs_notify_dirent_safe(rdev
->sysfs_badblocks
);
9497 EXPORT_SYMBOL_GPL(rdev_clear_badblocks
);
9499 static int md_notify_reboot(struct notifier_block
*this,
9500 unsigned long code
, void *x
)
9502 struct list_head
*tmp
;
9503 struct mddev
*mddev
;
9506 for_each_mddev(mddev
, tmp
) {
9507 if (mddev_trylock(mddev
)) {
9509 __md_stop_writes(mddev
);
9510 if (mddev
->persistent
)
9511 mddev
->safemode
= 2;
9512 mddev_unlock(mddev
);
9517 * certain more exotic SCSI devices are known to be
9518 * volatile wrt too early system reboots. While the
9519 * right place to handle this issue is the given
9520 * driver, we do want to have a safe RAID driver ...
9528 static struct notifier_block md_notifier
= {
9529 .notifier_call
= md_notify_reboot
,
9531 .priority
= INT_MAX
, /* before any real devices */
9534 static void md_geninit(void)
9536 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
9538 proc_create("mdstat", S_IRUGO
, NULL
, &mdstat_proc_ops
);
9541 static int __init
md_init(void)
9545 md_wq
= alloc_workqueue("md", WQ_MEM_RECLAIM
, 0);
9549 md_misc_wq
= alloc_workqueue("md_misc", 0, 0);
9553 md_rdev_misc_wq
= alloc_workqueue("md_rdev_misc", 0, 0);
9554 if (!md_rdev_misc_wq
)
9555 goto err_rdev_misc_wq
;
9557 ret
= __register_blkdev(MD_MAJOR
, "md", md_probe
);
9561 ret
= __register_blkdev(0, "mdp", md_probe
);
9566 register_reboot_notifier(&md_notifier
);
9567 raid_table_header
= register_sysctl_table(raid_root_table
);
9573 unregister_blkdev(MD_MAJOR
, "md");
9575 destroy_workqueue(md_rdev_misc_wq
);
9577 destroy_workqueue(md_misc_wq
);
9579 destroy_workqueue(md_wq
);
9584 static void check_sb_changes(struct mddev
*mddev
, struct md_rdev
*rdev
)
9586 struct mdp_superblock_1
*sb
= page_address(rdev
->sb_page
);
9587 struct md_rdev
*rdev2
;
9589 char b
[BDEVNAME_SIZE
];
9592 * If size is changed in another node then we need to
9593 * do resize as well.
9595 if (mddev
->dev_sectors
!= le64_to_cpu(sb
->size
)) {
9596 ret
= mddev
->pers
->resize(mddev
, le64_to_cpu(sb
->size
));
9598 pr_info("md-cluster: resize failed\n");
9600 md_bitmap_update_sb(mddev
->bitmap
);
9603 /* Check for change of roles in the active devices */
9604 rdev_for_each(rdev2
, mddev
) {
9605 if (test_bit(Faulty
, &rdev2
->flags
))
9608 /* Check if the roles changed */
9609 role
= le16_to_cpu(sb
->dev_roles
[rdev2
->desc_nr
]);
9611 if (test_bit(Candidate
, &rdev2
->flags
)) {
9612 if (role
== 0xfffe) {
9613 pr_info("md: Removing Candidate device %s because add failed\n", bdevname(rdev2
->bdev
,b
));
9614 md_kick_rdev_from_array(rdev2
);
9618 clear_bit(Candidate
, &rdev2
->flags
);
9621 if (role
!= rdev2
->raid_disk
) {
9623 * got activated except reshape is happening.
9625 if (rdev2
->raid_disk
== -1 && role
!= 0xffff &&
9626 !(le32_to_cpu(sb
->feature_map
) &
9627 MD_FEATURE_RESHAPE_ACTIVE
)) {
9628 rdev2
->saved_raid_disk
= role
;
9629 ret
= remove_and_add_spares(mddev
, rdev2
);
9630 pr_info("Activated spare: %s\n",
9631 bdevname(rdev2
->bdev
,b
));
9632 /* wakeup mddev->thread here, so array could
9633 * perform resync with the new activated disk */
9634 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
9635 md_wakeup_thread(mddev
->thread
);
9638 * We just want to do the minimum to mark the disk
9639 * as faulty. The recovery is performed by the
9640 * one who initiated the error.
9642 if ((role
== 0xfffe) || (role
== 0xfffd)) {
9643 md_error(mddev
, rdev2
);
9644 clear_bit(Blocked
, &rdev2
->flags
);
9649 if (mddev
->raid_disks
!= le32_to_cpu(sb
->raid_disks
)) {
9650 ret
= update_raid_disks(mddev
, le32_to_cpu(sb
->raid_disks
));
9652 pr_warn("md: updating array disks failed. %d\n", ret
);
9656 * Since mddev->delta_disks has already updated in update_raid_disks,
9657 * so it is time to check reshape.
9659 if (test_bit(MD_RESYNCING_REMOTE
, &mddev
->recovery
) &&
9660 (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
9662 * reshape is happening in the remote node, we need to
9663 * update reshape_position and call start_reshape.
9665 mddev
->reshape_position
= le64_to_cpu(sb
->reshape_position
);
9666 if (mddev
->pers
->update_reshape_pos
)
9667 mddev
->pers
->update_reshape_pos(mddev
);
9668 if (mddev
->pers
->start_reshape
)
9669 mddev
->pers
->start_reshape(mddev
);
9670 } else if (test_bit(MD_RESYNCING_REMOTE
, &mddev
->recovery
) &&
9671 mddev
->reshape_position
!= MaxSector
&&
9672 !(le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
9673 /* reshape is just done in another node. */
9674 mddev
->reshape_position
= MaxSector
;
9675 if (mddev
->pers
->update_reshape_pos
)
9676 mddev
->pers
->update_reshape_pos(mddev
);
9679 /* Finally set the event to be up to date */
9680 mddev
->events
= le64_to_cpu(sb
->events
);
9683 static int read_rdev(struct mddev
*mddev
, struct md_rdev
*rdev
)
9686 struct page
*swapout
= rdev
->sb_page
;
9687 struct mdp_superblock_1
*sb
;
9689 /* Store the sb page of the rdev in the swapout temporary
9690 * variable in case we err in the future
9692 rdev
->sb_page
= NULL
;
9693 err
= alloc_disk_sb(rdev
);
9695 ClearPageUptodate(rdev
->sb_page
);
9696 rdev
->sb_loaded
= 0;
9697 err
= super_types
[mddev
->major_version
].
9698 load_super(rdev
, NULL
, mddev
->minor_version
);
9701 pr_warn("%s: %d Could not reload rdev(%d) err: %d. Restoring old values\n",
9702 __func__
, __LINE__
, rdev
->desc_nr
, err
);
9704 put_page(rdev
->sb_page
);
9705 rdev
->sb_page
= swapout
;
9706 rdev
->sb_loaded
= 1;
9710 sb
= page_address(rdev
->sb_page
);
9711 /* Read the offset unconditionally, even if MD_FEATURE_RECOVERY_OFFSET
9715 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RECOVERY_OFFSET
))
9716 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
9718 /* The other node finished recovery, call spare_active to set
9719 * device In_sync and mddev->degraded
9721 if (rdev
->recovery_offset
== MaxSector
&&
9722 !test_bit(In_sync
, &rdev
->flags
) &&
9723 mddev
->pers
->spare_active(mddev
))
9724 sysfs_notify_dirent_safe(mddev
->sysfs_degraded
);
9730 void md_reload_sb(struct mddev
*mddev
, int nr
)
9732 struct md_rdev
*rdev
;
9736 rdev_for_each_rcu(rdev
, mddev
) {
9737 if (rdev
->desc_nr
== nr
)
9741 if (!rdev
|| rdev
->desc_nr
!= nr
) {
9742 pr_warn("%s: %d Could not find rdev with nr %d\n", __func__
, __LINE__
, nr
);
9746 err
= read_rdev(mddev
, rdev
);
9750 check_sb_changes(mddev
, rdev
);
9752 /* Read all rdev's to update recovery_offset */
9753 rdev_for_each_rcu(rdev
, mddev
) {
9754 if (!test_bit(Faulty
, &rdev
->flags
))
9755 read_rdev(mddev
, rdev
);
9758 EXPORT_SYMBOL(md_reload_sb
);
9763 * Searches all registered partitions for autorun RAID arrays
9767 static DEFINE_MUTEX(detected_devices_mutex
);
9768 static LIST_HEAD(all_detected_devices
);
9769 struct detected_devices_node
{
9770 struct list_head list
;
9774 void md_autodetect_dev(dev_t dev
)
9776 struct detected_devices_node
*node_detected_dev
;
9778 node_detected_dev
= kzalloc(sizeof(*node_detected_dev
), GFP_KERNEL
);
9779 if (node_detected_dev
) {
9780 node_detected_dev
->dev
= dev
;
9781 mutex_lock(&detected_devices_mutex
);
9782 list_add_tail(&node_detected_dev
->list
, &all_detected_devices
);
9783 mutex_unlock(&detected_devices_mutex
);
9787 void md_autostart_arrays(int part
)
9789 struct md_rdev
*rdev
;
9790 struct detected_devices_node
*node_detected_dev
;
9792 int i_scanned
, i_passed
;
9797 pr_info("md: Autodetecting RAID arrays.\n");
9799 mutex_lock(&detected_devices_mutex
);
9800 while (!list_empty(&all_detected_devices
) && i_scanned
< INT_MAX
) {
9802 node_detected_dev
= list_entry(all_detected_devices
.next
,
9803 struct detected_devices_node
, list
);
9804 list_del(&node_detected_dev
->list
);
9805 dev
= node_detected_dev
->dev
;
9806 kfree(node_detected_dev
);
9807 mutex_unlock(&detected_devices_mutex
);
9808 rdev
= md_import_device(dev
,0, 90);
9809 mutex_lock(&detected_devices_mutex
);
9813 if (test_bit(Faulty
, &rdev
->flags
))
9816 set_bit(AutoDetected
, &rdev
->flags
);
9817 list_add(&rdev
->same_set
, &pending_raid_disks
);
9820 mutex_unlock(&detected_devices_mutex
);
9822 pr_debug("md: Scanned %d and added %d devices.\n", i_scanned
, i_passed
);
9824 autorun_devices(part
);
9827 #endif /* !MODULE */
9829 static __exit
void md_exit(void)
9831 struct mddev
*mddev
;
9832 struct list_head
*tmp
;
9835 unregister_blkdev(MD_MAJOR
,"md");
9836 unregister_blkdev(mdp_major
, "mdp");
9837 unregister_reboot_notifier(&md_notifier
);
9838 unregister_sysctl_table(raid_table_header
);
9840 /* We cannot unload the modules while some process is
9841 * waiting for us in select() or poll() - wake them up
9844 while (waitqueue_active(&md_event_waiters
)) {
9845 /* not safe to leave yet */
9846 wake_up(&md_event_waiters
);
9850 remove_proc_entry("mdstat", NULL
);
9852 for_each_mddev(mddev
, tmp
) {
9853 export_array(mddev
);
9855 mddev
->hold_active
= 0;
9857 * for_each_mddev() will call mddev_put() at the end of each
9858 * iteration. As the mddev is now fully clear, this will
9859 * schedule the mddev for destruction by a workqueue, and the
9860 * destroy_workqueue() below will wait for that to complete.
9863 destroy_workqueue(md_rdev_misc_wq
);
9864 destroy_workqueue(md_misc_wq
);
9865 destroy_workqueue(md_wq
);
9868 subsys_initcall(md_init
);
9869 module_exit(md_exit
)
9871 static int get_ro(char *buffer
, const struct kernel_param
*kp
)
9873 return sprintf(buffer
, "%d\n", start_readonly
);
9875 static int set_ro(const char *val
, const struct kernel_param
*kp
)
9877 return kstrtouint(val
, 10, (unsigned int *)&start_readonly
);
9880 module_param_call(start_ro
, set_ro
, get_ro
, NULL
, S_IRUSR
|S_IWUSR
);
9881 module_param(start_dirty_degraded
, int, S_IRUGO
|S_IWUSR
);
9882 module_param_call(new_array
, add_named_array
, NULL
, NULL
, S_IWUSR
);
9883 module_param(create_on_open
, bool, S_IRUSR
|S_IWUSR
);
9885 MODULE_LICENSE("GPL");
9886 MODULE_DESCRIPTION("MD RAID framework");
9888 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);