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/signal.h>
41 #include <linux/kthread.h>
42 #include <linux/blkdev.h>
43 #include <linux/badblocks.h>
44 #include <linux/sysctl.h>
45 #include <linux/seq_file.h>
47 #include <linux/poll.h>
48 #include <linux/ctype.h>
49 #include <linux/string.h>
50 #include <linux/hdreg.h>
51 #include <linux/proc_fs.h>
52 #include <linux/random.h>
53 #include <linux/module.h>
54 #include <linux/reboot.h>
55 #include <linux/file.h>
56 #include <linux/compat.h>
57 #include <linux/delay.h>
58 #include <linux/raid/md_p.h>
59 #include <linux/raid/md_u.h>
60 #include <linux/slab.h>
61 #include <linux/percpu-refcount.h>
63 #include <trace/events/block.h>
65 #include "md-bitmap.h"
66 #include "md-cluster.h"
69 static void autostart_arrays(int part
);
72 /* pers_list is a list of registered personalities protected
74 * pers_lock does extra service to protect accesses to
75 * mddev->thread when the mutex cannot be held.
77 static LIST_HEAD(pers_list
);
78 static DEFINE_SPINLOCK(pers_lock
);
80 static struct kobj_type md_ktype
;
82 struct md_cluster_operations
*md_cluster_ops
;
83 EXPORT_SYMBOL(md_cluster_ops
);
84 static struct module
*md_cluster_mod
;
86 static DECLARE_WAIT_QUEUE_HEAD(resync_wait
);
87 static struct workqueue_struct
*md_wq
;
88 static struct workqueue_struct
*md_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
101 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
102 * is 1000 KB/sec, so the extra system load does not show up that much.
103 * Increase it if you want to have more _guaranteed_ speed. Note that
104 * the RAID driver will use the maximum available bandwidth if the IO
105 * subsystem is idle. There is also an 'absolute maximum' reconstruction
106 * speed limit - in case reconstruction slows down your system despite
109 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
110 * or /sys/block/mdX/md/sync_speed_{min,max}
113 static int sysctl_speed_limit_min
= 1000;
114 static int sysctl_speed_limit_max
= 200000;
115 static inline int speed_min(struct mddev
*mddev
)
117 return mddev
->sync_speed_min
?
118 mddev
->sync_speed_min
: sysctl_speed_limit_min
;
121 static inline int speed_max(struct mddev
*mddev
)
123 return mddev
->sync_speed_max
?
124 mddev
->sync_speed_max
: sysctl_speed_limit_max
;
127 static struct ctl_table_header
*raid_table_header
;
129 static struct ctl_table raid_table
[] = {
131 .procname
= "speed_limit_min",
132 .data
= &sysctl_speed_limit_min
,
133 .maxlen
= sizeof(int),
134 .mode
= S_IRUGO
|S_IWUSR
,
135 .proc_handler
= proc_dointvec
,
138 .procname
= "speed_limit_max",
139 .data
= &sysctl_speed_limit_max
,
140 .maxlen
= sizeof(int),
141 .mode
= S_IRUGO
|S_IWUSR
,
142 .proc_handler
= proc_dointvec
,
147 static struct ctl_table raid_dir_table
[] = {
151 .mode
= S_IRUGO
|S_IXUGO
,
157 static struct ctl_table raid_root_table
[] = {
162 .child
= raid_dir_table
,
167 static const struct block_device_operations md_fops
;
169 static int start_readonly
;
172 * The original mechanism for creating an md device is to create
173 * a device node in /dev and to open it. This causes races with device-close.
174 * The preferred method is to write to the "new_array" module parameter.
175 * This can avoid races.
176 * Setting create_on_open to false disables the original mechanism
177 * so all the races disappear.
179 static bool create_on_open
= true;
181 struct bio
*bio_alloc_mddev(gfp_t gfp_mask
, int nr_iovecs
,
184 if (!mddev
|| !bioset_initialized(&mddev
->bio_set
))
185 return bio_alloc(gfp_mask
, nr_iovecs
);
187 return bio_alloc_bioset(gfp_mask
, nr_iovecs
, &mddev
->bio_set
);
189 EXPORT_SYMBOL_GPL(bio_alloc_mddev
);
191 static struct bio
*md_bio_alloc_sync(struct mddev
*mddev
)
193 if (!mddev
|| !bioset_initialized(&mddev
->sync_set
))
194 return bio_alloc(GFP_NOIO
, 1);
196 return bio_alloc_bioset(GFP_NOIO
, 1, &mddev
->sync_set
);
200 * We have a system wide 'event count' that is incremented
201 * on any 'interesting' event, and readers of /proc/mdstat
202 * can use 'poll' or 'select' to find out when the event
206 * start array, stop array, error, add device, remove device,
207 * start build, activate spare
209 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters
);
210 static atomic_t md_event_count
;
211 void md_new_event(struct mddev
*mddev
)
213 atomic_inc(&md_event_count
);
214 wake_up(&md_event_waiters
);
216 EXPORT_SYMBOL_GPL(md_new_event
);
219 * Enables to iterate over all existing md arrays
220 * all_mddevs_lock protects this list.
222 static LIST_HEAD(all_mddevs
);
223 static DEFINE_SPINLOCK(all_mddevs_lock
);
226 * iterates through all used mddevs in the system.
227 * We take care to grab the all_mddevs_lock whenever navigating
228 * the list, and to always hold a refcount when unlocked.
229 * Any code which breaks out of this loop while own
230 * a reference to the current mddev and must mddev_put it.
232 #define for_each_mddev(_mddev,_tmp) \
234 for (({ spin_lock(&all_mddevs_lock); \
235 _tmp = all_mddevs.next; \
237 ({ if (_tmp != &all_mddevs) \
238 mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\
239 spin_unlock(&all_mddevs_lock); \
240 if (_mddev) mddev_put(_mddev); \
241 _mddev = list_entry(_tmp, struct mddev, all_mddevs); \
242 _tmp != &all_mddevs;}); \
243 ({ spin_lock(&all_mddevs_lock); \
244 _tmp = _tmp->next;}) \
247 /* Rather than calling directly into the personality make_request function,
248 * IO requests come here first so that we can check if the device is
249 * being suspended pending a reconfiguration.
250 * We hold a refcount over the call to ->make_request. By the time that
251 * call has finished, the bio has been linked into some internal structure
252 * and so is visible to ->quiesce(), so we don't need the refcount any more.
254 static bool is_suspended(struct mddev
*mddev
, struct bio
*bio
)
256 if (mddev
->suspended
)
258 if (bio_data_dir(bio
) != WRITE
)
260 if (mddev
->suspend_lo
>= mddev
->suspend_hi
)
262 if (bio
->bi_iter
.bi_sector
>= mddev
->suspend_hi
)
264 if (bio_end_sector(bio
) < mddev
->suspend_lo
)
269 void md_handle_request(struct mddev
*mddev
, struct bio
*bio
)
273 if (is_suspended(mddev
, bio
)) {
276 prepare_to_wait(&mddev
->sb_wait
, &__wait
,
277 TASK_UNINTERRUPTIBLE
);
278 if (!is_suspended(mddev
, bio
))
284 finish_wait(&mddev
->sb_wait
, &__wait
);
286 atomic_inc(&mddev
->active_io
);
289 if (!mddev
->pers
->make_request(mddev
, bio
)) {
290 atomic_dec(&mddev
->active_io
);
291 wake_up(&mddev
->sb_wait
);
292 goto check_suspended
;
295 if (atomic_dec_and_test(&mddev
->active_io
) && mddev
->suspended
)
296 wake_up(&mddev
->sb_wait
);
298 EXPORT_SYMBOL(md_handle_request
);
300 static blk_qc_t
md_make_request(struct request_queue
*q
, struct bio
*bio
)
302 const int rw
= bio_data_dir(bio
);
303 const int sgrp
= op_stat_group(bio_op(bio
));
304 struct mddev
*mddev
= q
->queuedata
;
305 unsigned int sectors
;
307 blk_queue_split(q
, &bio
);
309 if (mddev
== NULL
|| mddev
->pers
== NULL
) {
311 return BLK_QC_T_NONE
;
313 if (mddev
->ro
== 1 && unlikely(rw
== WRITE
)) {
314 if (bio_sectors(bio
) != 0)
315 bio
->bi_status
= BLK_STS_IOERR
;
317 return BLK_QC_T_NONE
;
321 * save the sectors now since our bio can
322 * go away inside make_request
324 sectors
= bio_sectors(bio
);
325 /* bio could be mergeable after passing to underlayer */
326 bio
->bi_opf
&= ~REQ_NOMERGE
;
328 md_handle_request(mddev
, bio
);
331 part_stat_inc(&mddev
->gendisk
->part0
, ios
[sgrp
]);
332 part_stat_add(&mddev
->gendisk
->part0
, sectors
[sgrp
], sectors
);
335 return BLK_QC_T_NONE
;
338 /* mddev_suspend makes sure no new requests are submitted
339 * to the device, and that any requests that have been submitted
340 * are completely handled.
341 * Once mddev_detach() is called and completes, the module will be
344 void mddev_suspend(struct mddev
*mddev
)
346 WARN_ON_ONCE(mddev
->thread
&& current
== mddev
->thread
->tsk
);
347 lockdep_assert_held(&mddev
->reconfig_mutex
);
348 if (mddev
->suspended
++)
351 wake_up(&mddev
->sb_wait
);
352 set_bit(MD_ALLOW_SB_UPDATE
, &mddev
->flags
);
353 smp_mb__after_atomic();
354 wait_event(mddev
->sb_wait
, atomic_read(&mddev
->active_io
) == 0);
355 mddev
->pers
->quiesce(mddev
, 1);
356 clear_bit_unlock(MD_ALLOW_SB_UPDATE
, &mddev
->flags
);
357 wait_event(mddev
->sb_wait
, !test_bit(MD_UPDATING_SB
, &mddev
->flags
));
359 del_timer_sync(&mddev
->safemode_timer
);
361 EXPORT_SYMBOL_GPL(mddev_suspend
);
363 void mddev_resume(struct mddev
*mddev
)
365 lockdep_assert_held(&mddev
->reconfig_mutex
);
366 if (--mddev
->suspended
)
368 wake_up(&mddev
->sb_wait
);
369 mddev
->pers
->quiesce(mddev
, 0);
371 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
372 md_wakeup_thread(mddev
->thread
);
373 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
375 EXPORT_SYMBOL_GPL(mddev_resume
);
377 int mddev_congested(struct mddev
*mddev
, int bits
)
379 struct md_personality
*pers
= mddev
->pers
;
383 if (mddev
->suspended
)
385 else if (pers
&& pers
->congested
)
386 ret
= pers
->congested(mddev
, bits
);
390 EXPORT_SYMBOL_GPL(mddev_congested
);
391 static int md_congested(void *data
, int bits
)
393 struct mddev
*mddev
= data
;
394 return mddev_congested(mddev
, bits
);
398 * Generic flush handling for md
401 static void md_end_flush(struct bio
*bio
)
403 struct md_rdev
*rdev
= bio
->bi_private
;
404 struct mddev
*mddev
= rdev
->mddev
;
406 rdev_dec_pending(rdev
, mddev
);
408 if (atomic_dec_and_test(&mddev
->flush_pending
)) {
409 /* The pre-request flush has finished */
410 queue_work(md_wq
, &mddev
->flush_work
);
415 static void md_submit_flush_data(struct work_struct
*ws
);
417 static void submit_flushes(struct work_struct
*ws
)
419 struct mddev
*mddev
= container_of(ws
, struct mddev
, flush_work
);
420 struct md_rdev
*rdev
;
422 mddev
->start_flush
= ktime_get_boottime();
423 INIT_WORK(&mddev
->flush_work
, md_submit_flush_data
);
424 atomic_set(&mddev
->flush_pending
, 1);
426 rdev_for_each_rcu(rdev
, mddev
)
427 if (rdev
->raid_disk
>= 0 &&
428 !test_bit(Faulty
, &rdev
->flags
)) {
429 /* Take two references, one is dropped
430 * when request finishes, one after
431 * we reclaim rcu_read_lock
434 atomic_inc(&rdev
->nr_pending
);
435 atomic_inc(&rdev
->nr_pending
);
437 bi
= bio_alloc_mddev(GFP_NOIO
, 0, mddev
);
438 bi
->bi_end_io
= md_end_flush
;
439 bi
->bi_private
= rdev
;
440 bio_set_dev(bi
, rdev
->bdev
);
441 bi
->bi_opf
= REQ_OP_WRITE
| REQ_PREFLUSH
;
442 atomic_inc(&mddev
->flush_pending
);
445 rdev_dec_pending(rdev
, mddev
);
448 if (atomic_dec_and_test(&mddev
->flush_pending
))
449 queue_work(md_wq
, &mddev
->flush_work
);
452 static void md_submit_flush_data(struct work_struct
*ws
)
454 struct mddev
*mddev
= container_of(ws
, struct mddev
, flush_work
);
455 struct bio
*bio
= mddev
->flush_bio
;
458 * must reset flush_bio before calling into md_handle_request to avoid a
459 * deadlock, because other bios passed md_handle_request suspend check
460 * could wait for this and below md_handle_request could wait for those
461 * bios because of suspend check
463 mddev
->last_flush
= mddev
->start_flush
;
464 mddev
->flush_bio
= NULL
;
465 wake_up(&mddev
->sb_wait
);
467 if (bio
->bi_iter
.bi_size
== 0) {
468 /* an empty barrier - all done */
471 bio
->bi_opf
&= ~REQ_PREFLUSH
;
472 md_handle_request(mddev
, bio
);
476 void md_flush_request(struct mddev
*mddev
, struct bio
*bio
)
478 ktime_t start
= ktime_get_boottime();
479 spin_lock_irq(&mddev
->lock
);
480 wait_event_lock_irq(mddev
->sb_wait
,
482 ktime_after(mddev
->last_flush
, start
),
484 if (!ktime_after(mddev
->last_flush
, start
)) {
485 WARN_ON(mddev
->flush_bio
);
486 mddev
->flush_bio
= bio
;
489 spin_unlock_irq(&mddev
->lock
);
492 INIT_WORK(&mddev
->flush_work
, submit_flushes
);
493 queue_work(md_wq
, &mddev
->flush_work
);
495 /* flush was performed for some other bio while we waited. */
496 if (bio
->bi_iter
.bi_size
== 0)
497 /* an empty barrier - all done */
500 bio
->bi_opf
&= ~REQ_PREFLUSH
;
501 mddev
->pers
->make_request(mddev
, bio
);
505 EXPORT_SYMBOL(md_flush_request
);
507 static inline struct mddev
*mddev_get(struct mddev
*mddev
)
509 atomic_inc(&mddev
->active
);
513 static void mddev_delayed_delete(struct work_struct
*ws
);
515 static void mddev_put(struct mddev
*mddev
)
517 if (!atomic_dec_and_lock(&mddev
->active
, &all_mddevs_lock
))
519 if (!mddev
->raid_disks
&& list_empty(&mddev
->disks
) &&
520 mddev
->ctime
== 0 && !mddev
->hold_active
) {
521 /* Array is not configured at all, and not held active,
523 list_del_init(&mddev
->all_mddevs
);
526 * Call queue_work inside the spinlock so that
527 * flush_workqueue() after mddev_find will succeed in waiting
528 * for the work to be done.
530 INIT_WORK(&mddev
->del_work
, mddev_delayed_delete
);
531 queue_work(md_misc_wq
, &mddev
->del_work
);
533 spin_unlock(&all_mddevs_lock
);
536 static void md_safemode_timeout(struct timer_list
*t
);
538 void mddev_init(struct mddev
*mddev
)
540 kobject_init(&mddev
->kobj
, &md_ktype
);
541 mutex_init(&mddev
->open_mutex
);
542 mutex_init(&mddev
->reconfig_mutex
);
543 mutex_init(&mddev
->bitmap_info
.mutex
);
544 INIT_LIST_HEAD(&mddev
->disks
);
545 INIT_LIST_HEAD(&mddev
->all_mddevs
);
546 timer_setup(&mddev
->safemode_timer
, md_safemode_timeout
, 0);
547 atomic_set(&mddev
->active
, 1);
548 atomic_set(&mddev
->openers
, 0);
549 atomic_set(&mddev
->active_io
, 0);
550 spin_lock_init(&mddev
->lock
);
551 atomic_set(&mddev
->flush_pending
, 0);
552 init_waitqueue_head(&mddev
->sb_wait
);
553 init_waitqueue_head(&mddev
->recovery_wait
);
554 mddev
->reshape_position
= MaxSector
;
555 mddev
->reshape_backwards
= 0;
556 mddev
->last_sync_action
= "none";
557 mddev
->resync_min
= 0;
558 mddev
->resync_max
= MaxSector
;
559 mddev
->level
= LEVEL_NONE
;
561 EXPORT_SYMBOL_GPL(mddev_init
);
563 static struct mddev
*mddev_find(dev_t unit
)
565 struct mddev
*mddev
, *new = NULL
;
567 if (unit
&& MAJOR(unit
) != MD_MAJOR
)
568 unit
&= ~((1<<MdpMinorShift
)-1);
571 spin_lock(&all_mddevs_lock
);
574 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
575 if (mddev
->unit
== unit
) {
577 spin_unlock(&all_mddevs_lock
);
583 list_add(&new->all_mddevs
, &all_mddevs
);
584 spin_unlock(&all_mddevs_lock
);
585 new->hold_active
= UNTIL_IOCTL
;
589 /* find an unused unit number */
590 static int next_minor
= 512;
591 int start
= next_minor
;
595 dev
= MKDEV(MD_MAJOR
, next_minor
);
597 if (next_minor
> MINORMASK
)
599 if (next_minor
== start
) {
600 /* Oh dear, all in use. */
601 spin_unlock(&all_mddevs_lock
);
607 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
608 if (mddev
->unit
== dev
) {
614 new->md_minor
= MINOR(dev
);
615 new->hold_active
= UNTIL_STOP
;
616 list_add(&new->all_mddevs
, &all_mddevs
);
617 spin_unlock(&all_mddevs_lock
);
620 spin_unlock(&all_mddevs_lock
);
622 new = kzalloc(sizeof(*new), GFP_KERNEL
);
627 if (MAJOR(unit
) == MD_MAJOR
)
628 new->md_minor
= MINOR(unit
);
630 new->md_minor
= MINOR(unit
) >> MdpMinorShift
;
637 static struct attribute_group md_redundancy_group
;
639 void mddev_unlock(struct mddev
*mddev
)
641 if (mddev
->to_remove
) {
642 /* These cannot be removed under reconfig_mutex as
643 * an access to the files will try to take reconfig_mutex
644 * while holding the file unremovable, which leads to
646 * So hold set sysfs_active while the remove in happeing,
647 * and anything else which might set ->to_remove or my
648 * otherwise change the sysfs namespace will fail with
649 * -EBUSY if sysfs_active is still set.
650 * We set sysfs_active under reconfig_mutex and elsewhere
651 * test it under the same mutex to ensure its correct value
654 struct attribute_group
*to_remove
= mddev
->to_remove
;
655 mddev
->to_remove
= NULL
;
656 mddev
->sysfs_active
= 1;
657 mutex_unlock(&mddev
->reconfig_mutex
);
659 if (mddev
->kobj
.sd
) {
660 if (to_remove
!= &md_redundancy_group
)
661 sysfs_remove_group(&mddev
->kobj
, to_remove
);
662 if (mddev
->pers
== NULL
||
663 mddev
->pers
->sync_request
== NULL
) {
664 sysfs_remove_group(&mddev
->kobj
, &md_redundancy_group
);
665 if (mddev
->sysfs_action
)
666 sysfs_put(mddev
->sysfs_action
);
667 mddev
->sysfs_action
= NULL
;
670 mddev
->sysfs_active
= 0;
672 mutex_unlock(&mddev
->reconfig_mutex
);
674 /* As we've dropped the mutex we need a spinlock to
675 * make sure the thread doesn't disappear
677 spin_lock(&pers_lock
);
678 md_wakeup_thread(mddev
->thread
);
679 wake_up(&mddev
->sb_wait
);
680 spin_unlock(&pers_lock
);
682 EXPORT_SYMBOL_GPL(mddev_unlock
);
684 struct md_rdev
*md_find_rdev_nr_rcu(struct mddev
*mddev
, int nr
)
686 struct md_rdev
*rdev
;
688 rdev_for_each_rcu(rdev
, mddev
)
689 if (rdev
->desc_nr
== nr
)
694 EXPORT_SYMBOL_GPL(md_find_rdev_nr_rcu
);
696 static struct md_rdev
*find_rdev(struct mddev
*mddev
, dev_t dev
)
698 struct md_rdev
*rdev
;
700 rdev_for_each(rdev
, mddev
)
701 if (rdev
->bdev
->bd_dev
== dev
)
707 struct md_rdev
*md_find_rdev_rcu(struct mddev
*mddev
, dev_t dev
)
709 struct md_rdev
*rdev
;
711 rdev_for_each_rcu(rdev
, mddev
)
712 if (rdev
->bdev
->bd_dev
== dev
)
717 EXPORT_SYMBOL_GPL(md_find_rdev_rcu
);
719 static struct md_personality
*find_pers(int level
, char *clevel
)
721 struct md_personality
*pers
;
722 list_for_each_entry(pers
, &pers_list
, list
) {
723 if (level
!= LEVEL_NONE
&& pers
->level
== level
)
725 if (strcmp(pers
->name
, clevel
)==0)
731 /* return the offset of the super block in 512byte sectors */
732 static inline sector_t
calc_dev_sboffset(struct md_rdev
*rdev
)
734 sector_t num_sectors
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
735 return MD_NEW_SIZE_SECTORS(num_sectors
);
738 static int alloc_disk_sb(struct md_rdev
*rdev
)
740 rdev
->sb_page
= alloc_page(GFP_KERNEL
);
746 void md_rdev_clear(struct md_rdev
*rdev
)
749 put_page(rdev
->sb_page
);
751 rdev
->sb_page
= NULL
;
756 put_page(rdev
->bb_page
);
757 rdev
->bb_page
= NULL
;
759 badblocks_exit(&rdev
->badblocks
);
761 EXPORT_SYMBOL_GPL(md_rdev_clear
);
763 static void super_written(struct bio
*bio
)
765 struct md_rdev
*rdev
= bio
->bi_private
;
766 struct mddev
*mddev
= rdev
->mddev
;
768 if (bio
->bi_status
) {
769 pr_err("md: super_written gets error=%d\n", bio
->bi_status
);
770 md_error(mddev
, rdev
);
771 if (!test_bit(Faulty
, &rdev
->flags
)
772 && (bio
->bi_opf
& MD_FAILFAST
)) {
773 set_bit(MD_SB_NEED_REWRITE
, &mddev
->sb_flags
);
774 set_bit(LastDev
, &rdev
->flags
);
777 clear_bit(LastDev
, &rdev
->flags
);
779 if (atomic_dec_and_test(&mddev
->pending_writes
))
780 wake_up(&mddev
->sb_wait
);
781 rdev_dec_pending(rdev
, mddev
);
785 void md_super_write(struct mddev
*mddev
, struct md_rdev
*rdev
,
786 sector_t sector
, int size
, struct page
*page
)
788 /* write first size bytes of page to sector of rdev
789 * Increment mddev->pending_writes before returning
790 * and decrement it on completion, waking up sb_wait
791 * if zero is reached.
792 * If an error occurred, call md_error
800 if (test_bit(Faulty
, &rdev
->flags
))
803 bio
= md_bio_alloc_sync(mddev
);
805 atomic_inc(&rdev
->nr_pending
);
807 bio_set_dev(bio
, rdev
->meta_bdev
? rdev
->meta_bdev
: rdev
->bdev
);
808 bio
->bi_iter
.bi_sector
= sector
;
809 bio_add_page(bio
, page
, size
, 0);
810 bio
->bi_private
= rdev
;
811 bio
->bi_end_io
= super_written
;
813 if (test_bit(MD_FAILFAST_SUPPORTED
, &mddev
->flags
) &&
814 test_bit(FailFast
, &rdev
->flags
) &&
815 !test_bit(LastDev
, &rdev
->flags
))
817 bio
->bi_opf
= REQ_OP_WRITE
| REQ_SYNC
| REQ_PREFLUSH
| REQ_FUA
| ff
;
819 atomic_inc(&mddev
->pending_writes
);
823 int md_super_wait(struct mddev
*mddev
)
825 /* wait for all superblock writes that were scheduled to complete */
826 wait_event(mddev
->sb_wait
, atomic_read(&mddev
->pending_writes
)==0);
827 if (test_and_clear_bit(MD_SB_NEED_REWRITE
, &mddev
->sb_flags
))
832 int sync_page_io(struct md_rdev
*rdev
, sector_t sector
, int size
,
833 struct page
*page
, int op
, int op_flags
, bool metadata_op
)
835 struct bio
*bio
= md_bio_alloc_sync(rdev
->mddev
);
838 if (metadata_op
&& rdev
->meta_bdev
)
839 bio_set_dev(bio
, rdev
->meta_bdev
);
841 bio_set_dev(bio
, rdev
->bdev
);
842 bio_set_op_attrs(bio
, op
, op_flags
);
844 bio
->bi_iter
.bi_sector
= sector
+ rdev
->sb_start
;
845 else if (rdev
->mddev
->reshape_position
!= MaxSector
&&
846 (rdev
->mddev
->reshape_backwards
==
847 (sector
>= rdev
->mddev
->reshape_position
)))
848 bio
->bi_iter
.bi_sector
= sector
+ rdev
->new_data_offset
;
850 bio
->bi_iter
.bi_sector
= sector
+ rdev
->data_offset
;
851 bio_add_page(bio
, page
, size
, 0);
853 submit_bio_wait(bio
);
855 ret
= !bio
->bi_status
;
859 EXPORT_SYMBOL_GPL(sync_page_io
);
861 static int read_disk_sb(struct md_rdev
*rdev
, int size
)
863 char b
[BDEVNAME_SIZE
];
868 if (!sync_page_io(rdev
, 0, size
, rdev
->sb_page
, REQ_OP_READ
, 0, true))
874 pr_err("md: disabled device %s, could not read superblock.\n",
875 bdevname(rdev
->bdev
,b
));
879 static int md_uuid_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
881 return sb1
->set_uuid0
== sb2
->set_uuid0
&&
882 sb1
->set_uuid1
== sb2
->set_uuid1
&&
883 sb1
->set_uuid2
== sb2
->set_uuid2
&&
884 sb1
->set_uuid3
== sb2
->set_uuid3
;
887 static int md_sb_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
890 mdp_super_t
*tmp1
, *tmp2
;
892 tmp1
= kmalloc(sizeof(*tmp1
),GFP_KERNEL
);
893 tmp2
= kmalloc(sizeof(*tmp2
),GFP_KERNEL
);
895 if (!tmp1
|| !tmp2
) {
904 * nr_disks is not constant
909 ret
= (memcmp(tmp1
, tmp2
, MD_SB_GENERIC_CONSTANT_WORDS
* 4) == 0);
916 static u32
md_csum_fold(u32 csum
)
918 csum
= (csum
& 0xffff) + (csum
>> 16);
919 return (csum
& 0xffff) + (csum
>> 16);
922 static unsigned int calc_sb_csum(mdp_super_t
*sb
)
925 u32
*sb32
= (u32
*)sb
;
927 unsigned int disk_csum
, csum
;
929 disk_csum
= sb
->sb_csum
;
932 for (i
= 0; i
< MD_SB_BYTES
/4 ; i
++)
934 csum
= (newcsum
& 0xffffffff) + (newcsum
>>32);
937 /* This used to use csum_partial, which was wrong for several
938 * reasons including that different results are returned on
939 * different architectures. It isn't critical that we get exactly
940 * the same return value as before (we always csum_fold before
941 * testing, and that removes any differences). However as we
942 * know that csum_partial always returned a 16bit value on
943 * alphas, do a fold to maximise conformity to previous behaviour.
945 sb
->sb_csum
= md_csum_fold(disk_csum
);
947 sb
->sb_csum
= disk_csum
;
953 * Handle superblock details.
954 * We want to be able to handle multiple superblock formats
955 * so we have a common interface to them all, and an array of
956 * different handlers.
957 * We rely on user-space to write the initial superblock, and support
958 * reading and updating of superblocks.
959 * Interface methods are:
960 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version)
961 * loads and validates a superblock on dev.
962 * if refdev != NULL, compare superblocks on both devices
964 * 0 - dev has a superblock that is compatible with refdev
965 * 1 - dev has a superblock that is compatible and newer than refdev
966 * so dev should be used as the refdev in future
967 * -EINVAL superblock incompatible or invalid
968 * -othererror e.g. -EIO
970 * int validate_super(struct mddev *mddev, struct md_rdev *dev)
971 * Verify that dev is acceptable into mddev.
972 * The first time, mddev->raid_disks will be 0, and data from
973 * dev should be merged in. Subsequent calls check that dev
974 * is new enough. Return 0 or -EINVAL
976 * void sync_super(struct mddev *mddev, struct md_rdev *dev)
977 * Update the superblock for rdev with data in mddev
978 * This does not write to disc.
984 struct module
*owner
;
985 int (*load_super
)(struct md_rdev
*rdev
,
986 struct md_rdev
*refdev
,
988 int (*validate_super
)(struct mddev
*mddev
,
989 struct md_rdev
*rdev
);
990 void (*sync_super
)(struct mddev
*mddev
,
991 struct md_rdev
*rdev
);
992 unsigned long long (*rdev_size_change
)(struct md_rdev
*rdev
,
993 sector_t num_sectors
);
994 int (*allow_new_offset
)(struct md_rdev
*rdev
,
995 unsigned long long new_offset
);
999 * Check that the given mddev has no bitmap.
1001 * This function is called from the run method of all personalities that do not
1002 * support bitmaps. It prints an error message and returns non-zero if mddev
1003 * has a bitmap. Otherwise, it returns 0.
1006 int md_check_no_bitmap(struct mddev
*mddev
)
1008 if (!mddev
->bitmap_info
.file
&& !mddev
->bitmap_info
.offset
)
1010 pr_warn("%s: bitmaps are not supported for %s\n",
1011 mdname(mddev
), mddev
->pers
->name
);
1014 EXPORT_SYMBOL(md_check_no_bitmap
);
1017 * load_super for 0.90.0
1019 static int super_90_load(struct md_rdev
*rdev
, struct md_rdev
*refdev
, int minor_version
)
1021 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1026 * Calculate the position of the superblock (512byte sectors),
1027 * it's at the end of the disk.
1029 * It also happens to be a multiple of 4Kb.
1031 rdev
->sb_start
= calc_dev_sboffset(rdev
);
1033 ret
= read_disk_sb(rdev
, MD_SB_BYTES
);
1039 bdevname(rdev
->bdev
, b
);
1040 sb
= page_address(rdev
->sb_page
);
1042 if (sb
->md_magic
!= MD_SB_MAGIC
) {
1043 pr_warn("md: invalid raid superblock magic on %s\n", b
);
1047 if (sb
->major_version
!= 0 ||
1048 sb
->minor_version
< 90 ||
1049 sb
->minor_version
> 91) {
1050 pr_warn("Bad version number %d.%d on %s\n",
1051 sb
->major_version
, sb
->minor_version
, b
);
1055 if (sb
->raid_disks
<= 0)
1058 if (md_csum_fold(calc_sb_csum(sb
)) != md_csum_fold(sb
->sb_csum
)) {
1059 pr_warn("md: invalid superblock checksum on %s\n", b
);
1063 rdev
->preferred_minor
= sb
->md_minor
;
1064 rdev
->data_offset
= 0;
1065 rdev
->new_data_offset
= 0;
1066 rdev
->sb_size
= MD_SB_BYTES
;
1067 rdev
->badblocks
.shift
= -1;
1069 if (sb
->level
== LEVEL_MULTIPATH
)
1072 rdev
->desc_nr
= sb
->this_disk
.number
;
1078 mdp_super_t
*refsb
= page_address(refdev
->sb_page
);
1079 if (!md_uuid_equal(refsb
, sb
)) {
1080 pr_warn("md: %s has different UUID to %s\n",
1081 b
, bdevname(refdev
->bdev
,b2
));
1084 if (!md_sb_equal(refsb
, sb
)) {
1085 pr_warn("md: %s has same UUID but different superblock to %s\n",
1086 b
, bdevname(refdev
->bdev
, b2
));
1090 ev2
= md_event(refsb
);
1096 rdev
->sectors
= rdev
->sb_start
;
1097 /* Limit to 4TB as metadata cannot record more than that.
1098 * (not needed for Linear and RAID0 as metadata doesn't
1101 if ((u64
)rdev
->sectors
>= (2ULL << 32) && sb
->level
>= 1)
1102 rdev
->sectors
= (sector_t
)(2ULL << 32) - 2;
1104 if (rdev
->sectors
< ((sector_t
)sb
->size
) * 2 && sb
->level
>= 1)
1105 /* "this cannot possibly happen" ... */
1113 * validate_super for 0.90.0
1115 static int super_90_validate(struct mddev
*mddev
, struct md_rdev
*rdev
)
1118 mdp_super_t
*sb
= page_address(rdev
->sb_page
);
1119 __u64 ev1
= md_event(sb
);
1121 rdev
->raid_disk
= -1;
1122 clear_bit(Faulty
, &rdev
->flags
);
1123 clear_bit(In_sync
, &rdev
->flags
);
1124 clear_bit(Bitmap_sync
, &rdev
->flags
);
1125 clear_bit(WriteMostly
, &rdev
->flags
);
1127 if (mddev
->raid_disks
== 0) {
1128 mddev
->major_version
= 0;
1129 mddev
->minor_version
= sb
->minor_version
;
1130 mddev
->patch_version
= sb
->patch_version
;
1131 mddev
->external
= 0;
1132 mddev
->chunk_sectors
= sb
->chunk_size
>> 9;
1133 mddev
->ctime
= sb
->ctime
;
1134 mddev
->utime
= sb
->utime
;
1135 mddev
->level
= sb
->level
;
1136 mddev
->clevel
[0] = 0;
1137 mddev
->layout
= sb
->layout
;
1138 mddev
->raid_disks
= sb
->raid_disks
;
1139 mddev
->dev_sectors
= ((sector_t
)sb
->size
) * 2;
1140 mddev
->events
= ev1
;
1141 mddev
->bitmap_info
.offset
= 0;
1142 mddev
->bitmap_info
.space
= 0;
1143 /* bitmap can use 60 K after the 4K superblocks */
1144 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
1145 mddev
->bitmap_info
.default_space
= 64*2 - (MD_SB_BYTES
>> 9);
1146 mddev
->reshape_backwards
= 0;
1148 if (mddev
->minor_version
>= 91) {
1149 mddev
->reshape_position
= sb
->reshape_position
;
1150 mddev
->delta_disks
= sb
->delta_disks
;
1151 mddev
->new_level
= sb
->new_level
;
1152 mddev
->new_layout
= sb
->new_layout
;
1153 mddev
->new_chunk_sectors
= sb
->new_chunk
>> 9;
1154 if (mddev
->delta_disks
< 0)
1155 mddev
->reshape_backwards
= 1;
1157 mddev
->reshape_position
= MaxSector
;
1158 mddev
->delta_disks
= 0;
1159 mddev
->new_level
= mddev
->level
;
1160 mddev
->new_layout
= mddev
->layout
;
1161 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1164 if (sb
->state
& (1<<MD_SB_CLEAN
))
1165 mddev
->recovery_cp
= MaxSector
;
1167 if (sb
->events_hi
== sb
->cp_events_hi
&&
1168 sb
->events_lo
== sb
->cp_events_lo
) {
1169 mddev
->recovery_cp
= sb
->recovery_cp
;
1171 mddev
->recovery_cp
= 0;
1174 memcpy(mddev
->uuid
+0, &sb
->set_uuid0
, 4);
1175 memcpy(mddev
->uuid
+4, &sb
->set_uuid1
, 4);
1176 memcpy(mddev
->uuid
+8, &sb
->set_uuid2
, 4);
1177 memcpy(mddev
->uuid
+12,&sb
->set_uuid3
, 4);
1179 mddev
->max_disks
= MD_SB_DISKS
;
1181 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
) &&
1182 mddev
->bitmap_info
.file
== NULL
) {
1183 mddev
->bitmap_info
.offset
=
1184 mddev
->bitmap_info
.default_offset
;
1185 mddev
->bitmap_info
.space
=
1186 mddev
->bitmap_info
.default_space
;
1189 } else if (mddev
->pers
== NULL
) {
1190 /* Insist on good event counter while assembling, except
1191 * for spares (which don't need an event count) */
1193 if (sb
->disks
[rdev
->desc_nr
].state
& (
1194 (1<<MD_DISK_SYNC
) | (1 << MD_DISK_ACTIVE
)))
1195 if (ev1
< mddev
->events
)
1197 } else if (mddev
->bitmap
) {
1198 /* if adding to array with a bitmap, then we can accept an
1199 * older device ... but not too old.
1201 if (ev1
< mddev
->bitmap
->events_cleared
)
1203 if (ev1
< mddev
->events
)
1204 set_bit(Bitmap_sync
, &rdev
->flags
);
1206 if (ev1
< mddev
->events
)
1207 /* just a hot-add of a new device, leave raid_disk at -1 */
1211 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1212 desc
= sb
->disks
+ rdev
->desc_nr
;
1214 if (desc
->state
& (1<<MD_DISK_FAULTY
))
1215 set_bit(Faulty
, &rdev
->flags
);
1216 else if (desc
->state
& (1<<MD_DISK_SYNC
) /* &&
1217 desc->raid_disk < mddev->raid_disks */) {
1218 set_bit(In_sync
, &rdev
->flags
);
1219 rdev
->raid_disk
= desc
->raid_disk
;
1220 rdev
->saved_raid_disk
= desc
->raid_disk
;
1221 } else if (desc
->state
& (1<<MD_DISK_ACTIVE
)) {
1222 /* active but not in sync implies recovery up to
1223 * reshape position. We don't know exactly where
1224 * that is, so set to zero for now */
1225 if (mddev
->minor_version
>= 91) {
1226 rdev
->recovery_offset
= 0;
1227 rdev
->raid_disk
= desc
->raid_disk
;
1230 if (desc
->state
& (1<<MD_DISK_WRITEMOSTLY
))
1231 set_bit(WriteMostly
, &rdev
->flags
);
1232 if (desc
->state
& (1<<MD_DISK_FAILFAST
))
1233 set_bit(FailFast
, &rdev
->flags
);
1234 } else /* MULTIPATH are always insync */
1235 set_bit(In_sync
, &rdev
->flags
);
1240 * sync_super for 0.90.0
1242 static void super_90_sync(struct mddev
*mddev
, struct md_rdev
*rdev
)
1245 struct md_rdev
*rdev2
;
1246 int next_spare
= mddev
->raid_disks
;
1248 /* make rdev->sb match mddev data..
1251 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1252 * 3/ any empty disks < next_spare become removed
1254 * disks[0] gets initialised to REMOVED because
1255 * we cannot be sure from other fields if it has
1256 * been initialised or not.
1259 int active
=0, working
=0,failed
=0,spare
=0,nr_disks
=0;
1261 rdev
->sb_size
= MD_SB_BYTES
;
1263 sb
= page_address(rdev
->sb_page
);
1265 memset(sb
, 0, sizeof(*sb
));
1267 sb
->md_magic
= MD_SB_MAGIC
;
1268 sb
->major_version
= mddev
->major_version
;
1269 sb
->patch_version
= mddev
->patch_version
;
1270 sb
->gvalid_words
= 0; /* ignored */
1271 memcpy(&sb
->set_uuid0
, mddev
->uuid
+0, 4);
1272 memcpy(&sb
->set_uuid1
, mddev
->uuid
+4, 4);
1273 memcpy(&sb
->set_uuid2
, mddev
->uuid
+8, 4);
1274 memcpy(&sb
->set_uuid3
, mddev
->uuid
+12,4);
1276 sb
->ctime
= clamp_t(time64_t
, mddev
->ctime
, 0, U32_MAX
);
1277 sb
->level
= mddev
->level
;
1278 sb
->size
= mddev
->dev_sectors
/ 2;
1279 sb
->raid_disks
= mddev
->raid_disks
;
1280 sb
->md_minor
= mddev
->md_minor
;
1281 sb
->not_persistent
= 0;
1282 sb
->utime
= clamp_t(time64_t
, mddev
->utime
, 0, U32_MAX
);
1284 sb
->events_hi
= (mddev
->events
>>32);
1285 sb
->events_lo
= (u32
)mddev
->events
;
1287 if (mddev
->reshape_position
== MaxSector
)
1288 sb
->minor_version
= 90;
1290 sb
->minor_version
= 91;
1291 sb
->reshape_position
= mddev
->reshape_position
;
1292 sb
->new_level
= mddev
->new_level
;
1293 sb
->delta_disks
= mddev
->delta_disks
;
1294 sb
->new_layout
= mddev
->new_layout
;
1295 sb
->new_chunk
= mddev
->new_chunk_sectors
<< 9;
1297 mddev
->minor_version
= sb
->minor_version
;
1300 sb
->recovery_cp
= mddev
->recovery_cp
;
1301 sb
->cp_events_hi
= (mddev
->events
>>32);
1302 sb
->cp_events_lo
= (u32
)mddev
->events
;
1303 if (mddev
->recovery_cp
== MaxSector
)
1304 sb
->state
= (1<< MD_SB_CLEAN
);
1306 sb
->recovery_cp
= 0;
1308 sb
->layout
= mddev
->layout
;
1309 sb
->chunk_size
= mddev
->chunk_sectors
<< 9;
1311 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
)
1312 sb
->state
|= (1<<MD_SB_BITMAP_PRESENT
);
1314 sb
->disks
[0].state
= (1<<MD_DISK_REMOVED
);
1315 rdev_for_each(rdev2
, mddev
) {
1318 int is_active
= test_bit(In_sync
, &rdev2
->flags
);
1320 if (rdev2
->raid_disk
>= 0 &&
1321 sb
->minor_version
>= 91)
1322 /* we have nowhere to store the recovery_offset,
1323 * but if it is not below the reshape_position,
1324 * we can piggy-back on that.
1327 if (rdev2
->raid_disk
< 0 ||
1328 test_bit(Faulty
, &rdev2
->flags
))
1331 desc_nr
= rdev2
->raid_disk
;
1333 desc_nr
= next_spare
++;
1334 rdev2
->desc_nr
= desc_nr
;
1335 d
= &sb
->disks
[rdev2
->desc_nr
];
1337 d
->number
= rdev2
->desc_nr
;
1338 d
->major
= MAJOR(rdev2
->bdev
->bd_dev
);
1339 d
->minor
= MINOR(rdev2
->bdev
->bd_dev
);
1341 d
->raid_disk
= rdev2
->raid_disk
;
1343 d
->raid_disk
= rdev2
->desc_nr
; /* compatibility */
1344 if (test_bit(Faulty
, &rdev2
->flags
))
1345 d
->state
= (1<<MD_DISK_FAULTY
);
1346 else if (is_active
) {
1347 d
->state
= (1<<MD_DISK_ACTIVE
);
1348 if (test_bit(In_sync
, &rdev2
->flags
))
1349 d
->state
|= (1<<MD_DISK_SYNC
);
1357 if (test_bit(WriteMostly
, &rdev2
->flags
))
1358 d
->state
|= (1<<MD_DISK_WRITEMOSTLY
);
1359 if (test_bit(FailFast
, &rdev2
->flags
))
1360 d
->state
|= (1<<MD_DISK_FAILFAST
);
1362 /* now set the "removed" and "faulty" bits on any missing devices */
1363 for (i
=0 ; i
< mddev
->raid_disks
; i
++) {
1364 mdp_disk_t
*d
= &sb
->disks
[i
];
1365 if (d
->state
== 0 && d
->number
== 0) {
1368 d
->state
= (1<<MD_DISK_REMOVED
);
1369 d
->state
|= (1<<MD_DISK_FAULTY
);
1373 sb
->nr_disks
= nr_disks
;
1374 sb
->active_disks
= active
;
1375 sb
->working_disks
= working
;
1376 sb
->failed_disks
= failed
;
1377 sb
->spare_disks
= spare
;
1379 sb
->this_disk
= sb
->disks
[rdev
->desc_nr
];
1380 sb
->sb_csum
= calc_sb_csum(sb
);
1384 * rdev_size_change for 0.90.0
1386 static unsigned long long
1387 super_90_rdev_size_change(struct md_rdev
*rdev
, sector_t num_sectors
)
1389 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1390 return 0; /* component must fit device */
1391 if (rdev
->mddev
->bitmap_info
.offset
)
1392 return 0; /* can't move bitmap */
1393 rdev
->sb_start
= calc_dev_sboffset(rdev
);
1394 if (!num_sectors
|| num_sectors
> rdev
->sb_start
)
1395 num_sectors
= rdev
->sb_start
;
1396 /* Limit to 4TB as metadata cannot record more than that.
1397 * 4TB == 2^32 KB, or 2*2^32 sectors.
1399 if ((u64
)num_sectors
>= (2ULL << 32) && rdev
->mddev
->level
>= 1)
1400 num_sectors
= (sector_t
)(2ULL << 32) - 2;
1402 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1404 } while (md_super_wait(rdev
->mddev
) < 0);
1409 super_90_allow_new_offset(struct md_rdev
*rdev
, unsigned long long new_offset
)
1411 /* non-zero offset changes not possible with v0.90 */
1412 return new_offset
== 0;
1416 * version 1 superblock
1419 static __le32
calc_sb_1_csum(struct mdp_superblock_1
*sb
)
1423 unsigned long long newcsum
;
1424 int size
= 256 + le32_to_cpu(sb
->max_dev
)*2;
1425 __le32
*isuper
= (__le32
*)sb
;
1427 disk_csum
= sb
->sb_csum
;
1430 for (; size
>= 4; size
-= 4)
1431 newcsum
+= le32_to_cpu(*isuper
++);
1434 newcsum
+= le16_to_cpu(*(__le16
*) isuper
);
1436 csum
= (newcsum
& 0xffffffff) + (newcsum
>> 32);
1437 sb
->sb_csum
= disk_csum
;
1438 return cpu_to_le32(csum
);
1441 static int super_1_load(struct md_rdev
*rdev
, struct md_rdev
*refdev
, int minor_version
)
1443 struct mdp_superblock_1
*sb
;
1447 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1451 * Calculate the position of the superblock in 512byte sectors.
1452 * It is always aligned to a 4K boundary and
1453 * depeding on minor_version, it can be:
1454 * 0: At least 8K, but less than 12K, from end of device
1455 * 1: At start of device
1456 * 2: 4K from start of device.
1458 switch(minor_version
) {
1460 sb_start
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1462 sb_start
&= ~(sector_t
)(4*2-1);
1473 rdev
->sb_start
= sb_start
;
1475 /* superblock is rarely larger than 1K, but it can be larger,
1476 * and it is safe to read 4k, so we do that
1478 ret
= read_disk_sb(rdev
, 4096);
1479 if (ret
) return ret
;
1481 sb
= page_address(rdev
->sb_page
);
1483 if (sb
->magic
!= cpu_to_le32(MD_SB_MAGIC
) ||
1484 sb
->major_version
!= cpu_to_le32(1) ||
1485 le32_to_cpu(sb
->max_dev
) > (4096-256)/2 ||
1486 le64_to_cpu(sb
->super_offset
) != rdev
->sb_start
||
1487 (le32_to_cpu(sb
->feature_map
) & ~MD_FEATURE_ALL
) != 0)
1490 if (calc_sb_1_csum(sb
) != sb
->sb_csum
) {
1491 pr_warn("md: invalid superblock checksum on %s\n",
1492 bdevname(rdev
->bdev
,b
));
1495 if (le64_to_cpu(sb
->data_size
) < 10) {
1496 pr_warn("md: data_size too small on %s\n",
1497 bdevname(rdev
->bdev
,b
));
1502 memcmp(sb
->pad3
, sb
->pad3
+1, sizeof(sb
->pad3
) - sizeof(sb
->pad3
[1])))
1503 /* Some padding is non-zero, might be a new feature */
1506 rdev
->preferred_minor
= 0xffff;
1507 rdev
->data_offset
= le64_to_cpu(sb
->data_offset
);
1508 rdev
->new_data_offset
= rdev
->data_offset
;
1509 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
) &&
1510 (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_NEW_OFFSET
))
1511 rdev
->new_data_offset
+= (s32
)le32_to_cpu(sb
->new_offset
);
1512 atomic_set(&rdev
->corrected_errors
, le32_to_cpu(sb
->cnt_corrected_read
));
1514 rdev
->sb_size
= le32_to_cpu(sb
->max_dev
) * 2 + 256;
1515 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1516 if (rdev
->sb_size
& bmask
)
1517 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1520 && rdev
->data_offset
< sb_start
+ (rdev
->sb_size
/512))
1523 && rdev
->new_data_offset
< sb_start
+ (rdev
->sb_size
/512))
1526 if (sb
->level
== cpu_to_le32(LEVEL_MULTIPATH
))
1529 rdev
->desc_nr
= le32_to_cpu(sb
->dev_number
);
1531 if (!rdev
->bb_page
) {
1532 rdev
->bb_page
= alloc_page(GFP_KERNEL
);
1536 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BAD_BLOCKS
) &&
1537 rdev
->badblocks
.count
== 0) {
1538 /* need to load the bad block list.
1539 * Currently we limit it to one page.
1545 int sectors
= le16_to_cpu(sb
->bblog_size
);
1546 if (sectors
> (PAGE_SIZE
/ 512))
1548 offset
= le32_to_cpu(sb
->bblog_offset
);
1551 bb_sector
= (long long)offset
;
1552 if (!sync_page_io(rdev
, bb_sector
, sectors
<< 9,
1553 rdev
->bb_page
, REQ_OP_READ
, 0, true))
1555 bbp
= (__le64
*)page_address(rdev
->bb_page
);
1556 rdev
->badblocks
.shift
= sb
->bblog_shift
;
1557 for (i
= 0 ; i
< (sectors
<< (9-3)) ; i
++, bbp
++) {
1558 u64 bb
= le64_to_cpu(*bbp
);
1559 int count
= bb
& (0x3ff);
1560 u64 sector
= bb
>> 10;
1561 sector
<<= sb
->bblog_shift
;
1562 count
<<= sb
->bblog_shift
;
1565 if (badblocks_set(&rdev
->badblocks
, sector
, count
, 1))
1568 } else if (sb
->bblog_offset
!= 0)
1569 rdev
->badblocks
.shift
= 0;
1571 if ((le32_to_cpu(sb
->feature_map
) &
1572 (MD_FEATURE_PPL
| MD_FEATURE_MULTIPLE_PPLS
))) {
1573 rdev
->ppl
.offset
= (__s16
)le16_to_cpu(sb
->ppl
.offset
);
1574 rdev
->ppl
.size
= le16_to_cpu(sb
->ppl
.size
);
1575 rdev
->ppl
.sector
= rdev
->sb_start
+ rdev
->ppl
.offset
;
1582 struct mdp_superblock_1
*refsb
= page_address(refdev
->sb_page
);
1584 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16) != 0 ||
1585 sb
->level
!= refsb
->level
||
1586 sb
->layout
!= refsb
->layout
||
1587 sb
->chunksize
!= refsb
->chunksize
) {
1588 pr_warn("md: %s has strangely different superblock to %s\n",
1589 bdevname(rdev
->bdev
,b
),
1590 bdevname(refdev
->bdev
,b2
));
1593 ev1
= le64_to_cpu(sb
->events
);
1594 ev2
= le64_to_cpu(refsb
->events
);
1601 if (minor_version
) {
1602 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9);
1603 sectors
-= rdev
->data_offset
;
1605 sectors
= rdev
->sb_start
;
1606 if (sectors
< le64_to_cpu(sb
->data_size
))
1608 rdev
->sectors
= le64_to_cpu(sb
->data_size
);
1612 static int super_1_validate(struct mddev
*mddev
, struct md_rdev
*rdev
)
1614 struct mdp_superblock_1
*sb
= page_address(rdev
->sb_page
);
1615 __u64 ev1
= le64_to_cpu(sb
->events
);
1617 rdev
->raid_disk
= -1;
1618 clear_bit(Faulty
, &rdev
->flags
);
1619 clear_bit(In_sync
, &rdev
->flags
);
1620 clear_bit(Bitmap_sync
, &rdev
->flags
);
1621 clear_bit(WriteMostly
, &rdev
->flags
);
1623 if (mddev
->raid_disks
== 0) {
1624 mddev
->major_version
= 1;
1625 mddev
->patch_version
= 0;
1626 mddev
->external
= 0;
1627 mddev
->chunk_sectors
= le32_to_cpu(sb
->chunksize
);
1628 mddev
->ctime
= le64_to_cpu(sb
->ctime
);
1629 mddev
->utime
= le64_to_cpu(sb
->utime
);
1630 mddev
->level
= le32_to_cpu(sb
->level
);
1631 mddev
->clevel
[0] = 0;
1632 mddev
->layout
= le32_to_cpu(sb
->layout
);
1633 mddev
->raid_disks
= le32_to_cpu(sb
->raid_disks
);
1634 mddev
->dev_sectors
= le64_to_cpu(sb
->size
);
1635 mddev
->events
= ev1
;
1636 mddev
->bitmap_info
.offset
= 0;
1637 mddev
->bitmap_info
.space
= 0;
1638 /* Default location for bitmap is 1K after superblock
1639 * using 3K - total of 4K
1641 mddev
->bitmap_info
.default_offset
= 1024 >> 9;
1642 mddev
->bitmap_info
.default_space
= (4096-1024) >> 9;
1643 mddev
->reshape_backwards
= 0;
1645 mddev
->recovery_cp
= le64_to_cpu(sb
->resync_offset
);
1646 memcpy(mddev
->uuid
, sb
->set_uuid
, 16);
1648 mddev
->max_disks
= (4096-256)/2;
1650 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
) &&
1651 mddev
->bitmap_info
.file
== NULL
) {
1652 mddev
->bitmap_info
.offset
=
1653 (__s32
)le32_to_cpu(sb
->bitmap_offset
);
1654 /* Metadata doesn't record how much space is available.
1655 * For 1.0, we assume we can use up to the superblock
1656 * if before, else to 4K beyond superblock.
1657 * For others, assume no change is possible.
1659 if (mddev
->minor_version
> 0)
1660 mddev
->bitmap_info
.space
= 0;
1661 else if (mddev
->bitmap_info
.offset
> 0)
1662 mddev
->bitmap_info
.space
=
1663 8 - mddev
->bitmap_info
.offset
;
1665 mddev
->bitmap_info
.space
=
1666 -mddev
->bitmap_info
.offset
;
1669 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
1670 mddev
->reshape_position
= le64_to_cpu(sb
->reshape_position
);
1671 mddev
->delta_disks
= le32_to_cpu(sb
->delta_disks
);
1672 mddev
->new_level
= le32_to_cpu(sb
->new_level
);
1673 mddev
->new_layout
= le32_to_cpu(sb
->new_layout
);
1674 mddev
->new_chunk_sectors
= le32_to_cpu(sb
->new_chunk
);
1675 if (mddev
->delta_disks
< 0 ||
1676 (mddev
->delta_disks
== 0 &&
1677 (le32_to_cpu(sb
->feature_map
)
1678 & MD_FEATURE_RESHAPE_BACKWARDS
)))
1679 mddev
->reshape_backwards
= 1;
1681 mddev
->reshape_position
= MaxSector
;
1682 mddev
->delta_disks
= 0;
1683 mddev
->new_level
= mddev
->level
;
1684 mddev
->new_layout
= mddev
->layout
;
1685 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1688 if (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_JOURNAL
)
1689 set_bit(MD_HAS_JOURNAL
, &mddev
->flags
);
1691 if (le32_to_cpu(sb
->feature_map
) &
1692 (MD_FEATURE_PPL
| MD_FEATURE_MULTIPLE_PPLS
)) {
1693 if (le32_to_cpu(sb
->feature_map
) &
1694 (MD_FEATURE_BITMAP_OFFSET
| MD_FEATURE_JOURNAL
))
1696 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_PPL
) &&
1697 (le32_to_cpu(sb
->feature_map
) &
1698 MD_FEATURE_MULTIPLE_PPLS
))
1700 set_bit(MD_HAS_PPL
, &mddev
->flags
);
1702 } else if (mddev
->pers
== NULL
) {
1703 /* Insist of good event counter while assembling, except for
1704 * spares (which don't need an event count) */
1706 if (rdev
->desc_nr
>= 0 &&
1707 rdev
->desc_nr
< le32_to_cpu(sb
->max_dev
) &&
1708 (le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]) < MD_DISK_ROLE_MAX
||
1709 le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]) == MD_DISK_ROLE_JOURNAL
))
1710 if (ev1
< mddev
->events
)
1712 } else if (mddev
->bitmap
) {
1713 /* If adding to array with a bitmap, then we can accept an
1714 * older device, but not too old.
1716 if (ev1
< mddev
->bitmap
->events_cleared
)
1718 if (ev1
< mddev
->events
)
1719 set_bit(Bitmap_sync
, &rdev
->flags
);
1721 if (ev1
< mddev
->events
)
1722 /* just a hot-add of a new device, leave raid_disk at -1 */
1725 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1727 if (rdev
->desc_nr
< 0 ||
1728 rdev
->desc_nr
>= le32_to_cpu(sb
->max_dev
)) {
1729 role
= MD_DISK_ROLE_SPARE
;
1732 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
1734 case MD_DISK_ROLE_SPARE
: /* spare */
1736 case MD_DISK_ROLE_FAULTY
: /* faulty */
1737 set_bit(Faulty
, &rdev
->flags
);
1739 case MD_DISK_ROLE_JOURNAL
: /* journal device */
1740 if (!(le32_to_cpu(sb
->feature_map
) & MD_FEATURE_JOURNAL
)) {
1741 /* journal device without journal feature */
1742 pr_warn("md: journal device provided without journal feature, ignoring the device\n");
1745 set_bit(Journal
, &rdev
->flags
);
1746 rdev
->journal_tail
= le64_to_cpu(sb
->journal_tail
);
1747 rdev
->raid_disk
= 0;
1750 rdev
->saved_raid_disk
= role
;
1751 if ((le32_to_cpu(sb
->feature_map
) &
1752 MD_FEATURE_RECOVERY_OFFSET
)) {
1753 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
1754 if (!(le32_to_cpu(sb
->feature_map
) &
1755 MD_FEATURE_RECOVERY_BITMAP
))
1756 rdev
->saved_raid_disk
= -1;
1758 set_bit(In_sync
, &rdev
->flags
);
1759 rdev
->raid_disk
= role
;
1762 if (sb
->devflags
& WriteMostly1
)
1763 set_bit(WriteMostly
, &rdev
->flags
);
1764 if (sb
->devflags
& FailFast1
)
1765 set_bit(FailFast
, &rdev
->flags
);
1766 if (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_REPLACEMENT
)
1767 set_bit(Replacement
, &rdev
->flags
);
1768 } else /* MULTIPATH are always insync */
1769 set_bit(In_sync
, &rdev
->flags
);
1774 static void super_1_sync(struct mddev
*mddev
, struct md_rdev
*rdev
)
1776 struct mdp_superblock_1
*sb
;
1777 struct md_rdev
*rdev2
;
1779 /* make rdev->sb match mddev and rdev data. */
1781 sb
= page_address(rdev
->sb_page
);
1783 sb
->feature_map
= 0;
1785 sb
->recovery_offset
= cpu_to_le64(0);
1786 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
1788 sb
->utime
= cpu_to_le64((__u64
)mddev
->utime
);
1789 sb
->events
= cpu_to_le64(mddev
->events
);
1791 sb
->resync_offset
= cpu_to_le64(mddev
->recovery_cp
);
1792 else if (test_bit(MD_JOURNAL_CLEAN
, &mddev
->flags
))
1793 sb
->resync_offset
= cpu_to_le64(MaxSector
);
1795 sb
->resync_offset
= cpu_to_le64(0);
1797 sb
->cnt_corrected_read
= cpu_to_le32(atomic_read(&rdev
->corrected_errors
));
1799 sb
->raid_disks
= cpu_to_le32(mddev
->raid_disks
);
1800 sb
->size
= cpu_to_le64(mddev
->dev_sectors
);
1801 sb
->chunksize
= cpu_to_le32(mddev
->chunk_sectors
);
1802 sb
->level
= cpu_to_le32(mddev
->level
);
1803 sb
->layout
= cpu_to_le32(mddev
->layout
);
1804 if (test_bit(FailFast
, &rdev
->flags
))
1805 sb
->devflags
|= FailFast1
;
1807 sb
->devflags
&= ~FailFast1
;
1809 if (test_bit(WriteMostly
, &rdev
->flags
))
1810 sb
->devflags
|= WriteMostly1
;
1812 sb
->devflags
&= ~WriteMostly1
;
1813 sb
->data_offset
= cpu_to_le64(rdev
->data_offset
);
1814 sb
->data_size
= cpu_to_le64(rdev
->sectors
);
1816 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
) {
1817 sb
->bitmap_offset
= cpu_to_le32((__u32
)mddev
->bitmap_info
.offset
);
1818 sb
->feature_map
= cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
);
1821 if (rdev
->raid_disk
>= 0 && !test_bit(Journal
, &rdev
->flags
) &&
1822 !test_bit(In_sync
, &rdev
->flags
)) {
1824 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET
);
1825 sb
->recovery_offset
=
1826 cpu_to_le64(rdev
->recovery_offset
);
1827 if (rdev
->saved_raid_disk
>= 0 && mddev
->bitmap
)
1829 cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP
);
1831 /* Note: recovery_offset and journal_tail share space */
1832 if (test_bit(Journal
, &rdev
->flags
))
1833 sb
->journal_tail
= cpu_to_le64(rdev
->journal_tail
);
1834 if (test_bit(Replacement
, &rdev
->flags
))
1836 cpu_to_le32(MD_FEATURE_REPLACEMENT
);
1838 if (mddev
->reshape_position
!= MaxSector
) {
1839 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE
);
1840 sb
->reshape_position
= cpu_to_le64(mddev
->reshape_position
);
1841 sb
->new_layout
= cpu_to_le32(mddev
->new_layout
);
1842 sb
->delta_disks
= cpu_to_le32(mddev
->delta_disks
);
1843 sb
->new_level
= cpu_to_le32(mddev
->new_level
);
1844 sb
->new_chunk
= cpu_to_le32(mddev
->new_chunk_sectors
);
1845 if (mddev
->delta_disks
== 0 &&
1846 mddev
->reshape_backwards
)
1848 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS
);
1849 if (rdev
->new_data_offset
!= rdev
->data_offset
) {
1851 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET
);
1852 sb
->new_offset
= cpu_to_le32((__u32
)(rdev
->new_data_offset
1853 - rdev
->data_offset
));
1857 if (mddev_is_clustered(mddev
))
1858 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_CLUSTERED
);
1860 if (rdev
->badblocks
.count
== 0)
1861 /* Nothing to do for bad blocks*/ ;
1862 else if (sb
->bblog_offset
== 0)
1863 /* Cannot record bad blocks on this device */
1864 md_error(mddev
, rdev
);
1866 struct badblocks
*bb
= &rdev
->badblocks
;
1867 __le64
*bbp
= (__le64
*)page_address(rdev
->bb_page
);
1869 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_BAD_BLOCKS
);
1874 seq
= read_seqbegin(&bb
->lock
);
1876 memset(bbp
, 0xff, PAGE_SIZE
);
1878 for (i
= 0 ; i
< bb
->count
; i
++) {
1879 u64 internal_bb
= p
[i
];
1880 u64 store_bb
= ((BB_OFFSET(internal_bb
) << 10)
1881 | BB_LEN(internal_bb
));
1882 bbp
[i
] = cpu_to_le64(store_bb
);
1885 if (read_seqretry(&bb
->lock
, seq
))
1888 bb
->sector
= (rdev
->sb_start
+
1889 (int)le32_to_cpu(sb
->bblog_offset
));
1890 bb
->size
= le16_to_cpu(sb
->bblog_size
);
1895 rdev_for_each(rdev2
, mddev
)
1896 if (rdev2
->desc_nr
+1 > max_dev
)
1897 max_dev
= rdev2
->desc_nr
+1;
1899 if (max_dev
> le32_to_cpu(sb
->max_dev
)) {
1901 sb
->max_dev
= cpu_to_le32(max_dev
);
1902 rdev
->sb_size
= max_dev
* 2 + 256;
1903 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1904 if (rdev
->sb_size
& bmask
)
1905 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1907 max_dev
= le32_to_cpu(sb
->max_dev
);
1909 for (i
=0; i
<max_dev
;i
++)
1910 sb
->dev_roles
[i
] = cpu_to_le16(MD_DISK_ROLE_SPARE
);
1912 if (test_bit(MD_HAS_JOURNAL
, &mddev
->flags
))
1913 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_JOURNAL
);
1915 if (test_bit(MD_HAS_PPL
, &mddev
->flags
)) {
1916 if (test_bit(MD_HAS_MULTIPLE_PPLS
, &mddev
->flags
))
1918 cpu_to_le32(MD_FEATURE_MULTIPLE_PPLS
);
1920 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_PPL
);
1921 sb
->ppl
.offset
= cpu_to_le16(rdev
->ppl
.offset
);
1922 sb
->ppl
.size
= cpu_to_le16(rdev
->ppl
.size
);
1925 rdev_for_each(rdev2
, mddev
) {
1927 if (test_bit(Faulty
, &rdev2
->flags
))
1928 sb
->dev_roles
[i
] = cpu_to_le16(MD_DISK_ROLE_FAULTY
);
1929 else if (test_bit(In_sync
, &rdev2
->flags
))
1930 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1931 else if (test_bit(Journal
, &rdev2
->flags
))
1932 sb
->dev_roles
[i
] = cpu_to_le16(MD_DISK_ROLE_JOURNAL
);
1933 else if (rdev2
->raid_disk
>= 0)
1934 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1936 sb
->dev_roles
[i
] = cpu_to_le16(MD_DISK_ROLE_SPARE
);
1939 sb
->sb_csum
= calc_sb_1_csum(sb
);
1942 static unsigned long long
1943 super_1_rdev_size_change(struct md_rdev
*rdev
, sector_t num_sectors
)
1945 struct mdp_superblock_1
*sb
;
1946 sector_t max_sectors
;
1947 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1948 return 0; /* component must fit device */
1949 if (rdev
->data_offset
!= rdev
->new_data_offset
)
1950 return 0; /* too confusing */
1951 if (rdev
->sb_start
< rdev
->data_offset
) {
1952 /* minor versions 1 and 2; superblock before data */
1953 max_sectors
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1954 max_sectors
-= rdev
->data_offset
;
1955 if (!num_sectors
|| num_sectors
> max_sectors
)
1956 num_sectors
= max_sectors
;
1957 } else if (rdev
->mddev
->bitmap_info
.offset
) {
1958 /* minor version 0 with bitmap we can't move */
1961 /* minor version 0; superblock after data */
1963 sb_start
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) - 8*2;
1964 sb_start
&= ~(sector_t
)(4*2 - 1);
1965 max_sectors
= rdev
->sectors
+ sb_start
- rdev
->sb_start
;
1966 if (!num_sectors
|| num_sectors
> max_sectors
)
1967 num_sectors
= max_sectors
;
1968 rdev
->sb_start
= sb_start
;
1970 sb
= page_address(rdev
->sb_page
);
1971 sb
->data_size
= cpu_to_le64(num_sectors
);
1972 sb
->super_offset
= cpu_to_le64(rdev
->sb_start
);
1973 sb
->sb_csum
= calc_sb_1_csum(sb
);
1975 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1977 } while (md_super_wait(rdev
->mddev
) < 0);
1983 super_1_allow_new_offset(struct md_rdev
*rdev
,
1984 unsigned long long new_offset
)
1986 /* All necessary checks on new >= old have been done */
1987 struct bitmap
*bitmap
;
1988 if (new_offset
>= rdev
->data_offset
)
1991 /* with 1.0 metadata, there is no metadata to tread on
1992 * so we can always move back */
1993 if (rdev
->mddev
->minor_version
== 0)
1996 /* otherwise we must be sure not to step on
1997 * any metadata, so stay:
1998 * 36K beyond start of superblock
1999 * beyond end of badblocks
2000 * beyond write-intent bitmap
2002 if (rdev
->sb_start
+ (32+4)*2 > new_offset
)
2004 bitmap
= rdev
->mddev
->bitmap
;
2005 if (bitmap
&& !rdev
->mddev
->bitmap_info
.file
&&
2006 rdev
->sb_start
+ rdev
->mddev
->bitmap_info
.offset
+
2007 bitmap
->storage
.file_pages
* (PAGE_SIZE
>>9) > new_offset
)
2009 if (rdev
->badblocks
.sector
+ rdev
->badblocks
.size
> new_offset
)
2015 static struct super_type super_types
[] = {
2018 .owner
= THIS_MODULE
,
2019 .load_super
= super_90_load
,
2020 .validate_super
= super_90_validate
,
2021 .sync_super
= super_90_sync
,
2022 .rdev_size_change
= super_90_rdev_size_change
,
2023 .allow_new_offset
= super_90_allow_new_offset
,
2027 .owner
= THIS_MODULE
,
2028 .load_super
= super_1_load
,
2029 .validate_super
= super_1_validate
,
2030 .sync_super
= super_1_sync
,
2031 .rdev_size_change
= super_1_rdev_size_change
,
2032 .allow_new_offset
= super_1_allow_new_offset
,
2036 static void sync_super(struct mddev
*mddev
, struct md_rdev
*rdev
)
2038 if (mddev
->sync_super
) {
2039 mddev
->sync_super(mddev
, rdev
);
2043 BUG_ON(mddev
->major_version
>= ARRAY_SIZE(super_types
));
2045 super_types
[mddev
->major_version
].sync_super(mddev
, rdev
);
2048 static int match_mddev_units(struct mddev
*mddev1
, struct mddev
*mddev2
)
2050 struct md_rdev
*rdev
, *rdev2
;
2053 rdev_for_each_rcu(rdev
, mddev1
) {
2054 if (test_bit(Faulty
, &rdev
->flags
) ||
2055 test_bit(Journal
, &rdev
->flags
) ||
2056 rdev
->raid_disk
== -1)
2058 rdev_for_each_rcu(rdev2
, mddev2
) {
2059 if (test_bit(Faulty
, &rdev2
->flags
) ||
2060 test_bit(Journal
, &rdev2
->flags
) ||
2061 rdev2
->raid_disk
== -1)
2063 if (rdev
->bdev
->bd_contains
==
2064 rdev2
->bdev
->bd_contains
) {
2074 static LIST_HEAD(pending_raid_disks
);
2077 * Try to register data integrity profile for an mddev
2079 * This is called when an array is started and after a disk has been kicked
2080 * from the array. It only succeeds if all working and active component devices
2081 * are integrity capable with matching profiles.
2083 int md_integrity_register(struct mddev
*mddev
)
2085 struct md_rdev
*rdev
, *reference
= NULL
;
2087 if (list_empty(&mddev
->disks
))
2088 return 0; /* nothing to do */
2089 if (!mddev
->gendisk
|| blk_get_integrity(mddev
->gendisk
))
2090 return 0; /* shouldn't register, or already is */
2091 rdev_for_each(rdev
, mddev
) {
2092 /* skip spares and non-functional disks */
2093 if (test_bit(Faulty
, &rdev
->flags
))
2095 if (rdev
->raid_disk
< 0)
2098 /* Use the first rdev as the reference */
2102 /* does this rdev's profile match the reference profile? */
2103 if (blk_integrity_compare(reference
->bdev
->bd_disk
,
2104 rdev
->bdev
->bd_disk
) < 0)
2107 if (!reference
|| !bdev_get_integrity(reference
->bdev
))
2110 * All component devices are integrity capable and have matching
2111 * profiles, register the common profile for the md device.
2113 blk_integrity_register(mddev
->gendisk
,
2114 bdev_get_integrity(reference
->bdev
));
2116 pr_debug("md: data integrity enabled on %s\n", mdname(mddev
));
2117 if (bioset_integrity_create(&mddev
->bio_set
, BIO_POOL_SIZE
)) {
2118 pr_err("md: failed to create integrity pool for %s\n",
2124 EXPORT_SYMBOL(md_integrity_register
);
2127 * Attempt to add an rdev, but only if it is consistent with the current
2130 int md_integrity_add_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
2132 struct blk_integrity
*bi_mddev
;
2133 char name
[BDEVNAME_SIZE
];
2135 if (!mddev
->gendisk
)
2138 bi_mddev
= blk_get_integrity(mddev
->gendisk
);
2140 if (!bi_mddev
) /* nothing to do */
2143 if (blk_integrity_compare(mddev
->gendisk
, rdev
->bdev
->bd_disk
) != 0) {
2144 pr_err("%s: incompatible integrity profile for %s\n",
2145 mdname(mddev
), bdevname(rdev
->bdev
, name
));
2151 EXPORT_SYMBOL(md_integrity_add_rdev
);
2153 static int bind_rdev_to_array(struct md_rdev
*rdev
, struct mddev
*mddev
)
2155 char b
[BDEVNAME_SIZE
];
2159 /* prevent duplicates */
2160 if (find_rdev(mddev
, rdev
->bdev
->bd_dev
))
2163 if ((bdev_read_only(rdev
->bdev
) || bdev_read_only(rdev
->meta_bdev
)) &&
2167 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2168 if (!test_bit(Journal
, &rdev
->flags
) &&
2170 (mddev
->dev_sectors
== 0 || rdev
->sectors
< mddev
->dev_sectors
)) {
2172 /* Cannot change size, so fail
2173 * If mddev->level <= 0, then we don't care
2174 * about aligning sizes (e.g. linear)
2176 if (mddev
->level
> 0)
2179 mddev
->dev_sectors
= rdev
->sectors
;
2182 /* Verify rdev->desc_nr is unique.
2183 * If it is -1, assign a free number, else
2184 * check number is not in use
2187 if (rdev
->desc_nr
< 0) {
2190 choice
= mddev
->raid_disks
;
2191 while (md_find_rdev_nr_rcu(mddev
, choice
))
2193 rdev
->desc_nr
= choice
;
2195 if (md_find_rdev_nr_rcu(mddev
, rdev
->desc_nr
)) {
2201 if (!test_bit(Journal
, &rdev
->flags
) &&
2202 mddev
->max_disks
&& rdev
->desc_nr
>= mddev
->max_disks
) {
2203 pr_warn("md: %s: array is limited to %d devices\n",
2204 mdname(mddev
), mddev
->max_disks
);
2207 bdevname(rdev
->bdev
,b
);
2208 strreplace(b
, '/', '!');
2210 rdev
->mddev
= mddev
;
2211 pr_debug("md: bind<%s>\n", b
);
2213 if ((err
= kobject_add(&rdev
->kobj
, &mddev
->kobj
, "dev-%s", b
)))
2216 ko
= &part_to_dev(rdev
->bdev
->bd_part
)->kobj
;
2217 if (sysfs_create_link(&rdev
->kobj
, ko
, "block"))
2218 /* failure here is OK */;
2219 rdev
->sysfs_state
= sysfs_get_dirent_safe(rdev
->kobj
.sd
, "state");
2221 list_add_rcu(&rdev
->same_set
, &mddev
->disks
);
2222 bd_link_disk_holder(rdev
->bdev
, mddev
->gendisk
);
2224 /* May as well allow recovery to be retried once */
2225 mddev
->recovery_disabled
++;
2230 pr_warn("md: failed to register dev-%s for %s\n",
2235 static void md_delayed_delete(struct work_struct
*ws
)
2237 struct md_rdev
*rdev
= container_of(ws
, struct md_rdev
, del_work
);
2238 kobject_del(&rdev
->kobj
);
2239 kobject_put(&rdev
->kobj
);
2242 static void unbind_rdev_from_array(struct md_rdev
*rdev
)
2244 char b
[BDEVNAME_SIZE
];
2246 bd_unlink_disk_holder(rdev
->bdev
, rdev
->mddev
->gendisk
);
2247 list_del_rcu(&rdev
->same_set
);
2248 pr_debug("md: unbind<%s>\n", bdevname(rdev
->bdev
,b
));
2250 sysfs_remove_link(&rdev
->kobj
, "block");
2251 sysfs_put(rdev
->sysfs_state
);
2252 rdev
->sysfs_state
= NULL
;
2253 rdev
->badblocks
.count
= 0;
2254 /* We need to delay this, otherwise we can deadlock when
2255 * writing to 'remove' to "dev/state". We also need
2256 * to delay it due to rcu usage.
2259 INIT_WORK(&rdev
->del_work
, md_delayed_delete
);
2260 kobject_get(&rdev
->kobj
);
2261 queue_work(md_misc_wq
, &rdev
->del_work
);
2265 * prevent the device from being mounted, repartitioned or
2266 * otherwise reused by a RAID array (or any other kernel
2267 * subsystem), by bd_claiming the device.
2269 static int lock_rdev(struct md_rdev
*rdev
, dev_t dev
, int shared
)
2272 struct block_device
*bdev
;
2273 char b
[BDEVNAME_SIZE
];
2275 bdev
= blkdev_get_by_dev(dev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
,
2276 shared
? (struct md_rdev
*)lock_rdev
: rdev
);
2278 pr_warn("md: could not open %s.\n", __bdevname(dev
, b
));
2279 return PTR_ERR(bdev
);
2285 static void unlock_rdev(struct md_rdev
*rdev
)
2287 struct block_device
*bdev
= rdev
->bdev
;
2289 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
);
2292 void md_autodetect_dev(dev_t dev
);
2294 static void export_rdev(struct md_rdev
*rdev
)
2296 char b
[BDEVNAME_SIZE
];
2298 pr_debug("md: export_rdev(%s)\n", bdevname(rdev
->bdev
,b
));
2299 md_rdev_clear(rdev
);
2301 if (test_bit(AutoDetected
, &rdev
->flags
))
2302 md_autodetect_dev(rdev
->bdev
->bd_dev
);
2305 kobject_put(&rdev
->kobj
);
2308 void md_kick_rdev_from_array(struct md_rdev
*rdev
)
2310 unbind_rdev_from_array(rdev
);
2313 EXPORT_SYMBOL_GPL(md_kick_rdev_from_array
);
2315 static void export_array(struct mddev
*mddev
)
2317 struct md_rdev
*rdev
;
2319 while (!list_empty(&mddev
->disks
)) {
2320 rdev
= list_first_entry(&mddev
->disks
, struct md_rdev
,
2322 md_kick_rdev_from_array(rdev
);
2324 mddev
->raid_disks
= 0;
2325 mddev
->major_version
= 0;
2328 static bool set_in_sync(struct mddev
*mddev
)
2330 lockdep_assert_held(&mddev
->lock
);
2331 if (!mddev
->in_sync
) {
2332 mddev
->sync_checkers
++;
2333 spin_unlock(&mddev
->lock
);
2334 percpu_ref_switch_to_atomic_sync(&mddev
->writes_pending
);
2335 spin_lock(&mddev
->lock
);
2336 if (!mddev
->in_sync
&&
2337 percpu_ref_is_zero(&mddev
->writes_pending
)) {
2340 * Ensure ->in_sync is visible before we clear
2344 set_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
2345 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
2347 if (--mddev
->sync_checkers
== 0)
2348 percpu_ref_switch_to_percpu(&mddev
->writes_pending
);
2350 if (mddev
->safemode
== 1)
2351 mddev
->safemode
= 0;
2352 return mddev
->in_sync
;
2355 static void sync_sbs(struct mddev
*mddev
, int nospares
)
2357 /* Update each superblock (in-memory image), but
2358 * if we are allowed to, skip spares which already
2359 * have the right event counter, or have one earlier
2360 * (which would mean they aren't being marked as dirty
2361 * with the rest of the array)
2363 struct md_rdev
*rdev
;
2364 rdev_for_each(rdev
, mddev
) {
2365 if (rdev
->sb_events
== mddev
->events
||
2367 rdev
->raid_disk
< 0 &&
2368 rdev
->sb_events
+1 == mddev
->events
)) {
2369 /* Don't update this superblock */
2370 rdev
->sb_loaded
= 2;
2372 sync_super(mddev
, rdev
);
2373 rdev
->sb_loaded
= 1;
2378 static bool does_sb_need_changing(struct mddev
*mddev
)
2380 struct md_rdev
*rdev
;
2381 struct mdp_superblock_1
*sb
;
2384 /* Find a good rdev */
2385 rdev_for_each(rdev
, mddev
)
2386 if ((rdev
->raid_disk
>= 0) && !test_bit(Faulty
, &rdev
->flags
))
2389 /* No good device found. */
2393 sb
= page_address(rdev
->sb_page
);
2394 /* Check if a device has become faulty or a spare become active */
2395 rdev_for_each(rdev
, mddev
) {
2396 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
2397 /* Device activated? */
2398 if (role
== 0xffff && rdev
->raid_disk
>=0 &&
2399 !test_bit(Faulty
, &rdev
->flags
))
2401 /* Device turned faulty? */
2402 if (test_bit(Faulty
, &rdev
->flags
) && (role
< 0xfffd))
2406 /* Check if any mddev parameters have changed */
2407 if ((mddev
->dev_sectors
!= le64_to_cpu(sb
->size
)) ||
2408 (mddev
->reshape_position
!= le64_to_cpu(sb
->reshape_position
)) ||
2409 (mddev
->layout
!= le32_to_cpu(sb
->layout
)) ||
2410 (mddev
->raid_disks
!= le32_to_cpu(sb
->raid_disks
)) ||
2411 (mddev
->chunk_sectors
!= le32_to_cpu(sb
->chunksize
)))
2417 void md_update_sb(struct mddev
*mddev
, int force_change
)
2419 struct md_rdev
*rdev
;
2422 int any_badblocks_changed
= 0;
2427 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
2432 if (mddev_is_clustered(mddev
)) {
2433 if (test_and_clear_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
))
2435 if (test_and_clear_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
))
2437 ret
= md_cluster_ops
->metadata_update_start(mddev
);
2438 /* Has someone else has updated the sb */
2439 if (!does_sb_need_changing(mddev
)) {
2441 md_cluster_ops
->metadata_update_cancel(mddev
);
2442 bit_clear_unless(&mddev
->sb_flags
, BIT(MD_SB_CHANGE_PENDING
),
2443 BIT(MD_SB_CHANGE_DEVS
) |
2444 BIT(MD_SB_CHANGE_CLEAN
));
2450 * First make sure individual recovery_offsets are correct
2451 * curr_resync_completed can only be used during recovery.
2452 * During reshape/resync it might use array-addresses rather
2453 * that device addresses.
2455 rdev_for_each(rdev
, mddev
) {
2456 if (rdev
->raid_disk
>= 0 &&
2457 mddev
->delta_disks
>= 0 &&
2458 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
2459 test_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
) &&
2460 !test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
2461 !test_bit(Journal
, &rdev
->flags
) &&
2462 !test_bit(In_sync
, &rdev
->flags
) &&
2463 mddev
->curr_resync_completed
> rdev
->recovery_offset
)
2464 rdev
->recovery_offset
= mddev
->curr_resync_completed
;
2467 if (!mddev
->persistent
) {
2468 clear_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
2469 clear_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
2470 if (!mddev
->external
) {
2471 clear_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
2472 rdev_for_each(rdev
, mddev
) {
2473 if (rdev
->badblocks
.changed
) {
2474 rdev
->badblocks
.changed
= 0;
2475 ack_all_badblocks(&rdev
->badblocks
);
2476 md_error(mddev
, rdev
);
2478 clear_bit(Blocked
, &rdev
->flags
);
2479 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2480 wake_up(&rdev
->blocked_wait
);
2483 wake_up(&mddev
->sb_wait
);
2487 spin_lock(&mddev
->lock
);
2489 mddev
->utime
= ktime_get_real_seconds();
2491 if (test_and_clear_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
))
2493 if (test_and_clear_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
))
2494 /* just a clean<-> dirty transition, possibly leave spares alone,
2495 * though if events isn't the right even/odd, we will have to do
2501 if (mddev
->degraded
)
2502 /* If the array is degraded, then skipping spares is both
2503 * dangerous and fairly pointless.
2504 * Dangerous because a device that was removed from the array
2505 * might have a event_count that still looks up-to-date,
2506 * so it can be re-added without a resync.
2507 * Pointless because if there are any spares to skip,
2508 * then a recovery will happen and soon that array won't
2509 * be degraded any more and the spare can go back to sleep then.
2513 sync_req
= mddev
->in_sync
;
2515 /* If this is just a dirty<->clean transition, and the array is clean
2516 * and 'events' is odd, we can roll back to the previous clean state */
2518 && (mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
2519 && mddev
->can_decrease_events
2520 && mddev
->events
!= 1) {
2522 mddev
->can_decrease_events
= 0;
2524 /* otherwise we have to go forward and ... */
2526 mddev
->can_decrease_events
= nospares
;
2530 * This 64-bit counter should never wrap.
2531 * Either we are in around ~1 trillion A.C., assuming
2532 * 1 reboot per second, or we have a bug...
2534 WARN_ON(mddev
->events
== 0);
2536 rdev_for_each(rdev
, mddev
) {
2537 if (rdev
->badblocks
.changed
)
2538 any_badblocks_changed
++;
2539 if (test_bit(Faulty
, &rdev
->flags
))
2540 set_bit(FaultRecorded
, &rdev
->flags
);
2543 sync_sbs(mddev
, nospares
);
2544 spin_unlock(&mddev
->lock
);
2546 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2547 mdname(mddev
), mddev
->in_sync
);
2550 blk_add_trace_msg(mddev
->queue
, "md md_update_sb");
2552 md_bitmap_update_sb(mddev
->bitmap
);
2553 rdev_for_each(rdev
, mddev
) {
2554 char b
[BDEVNAME_SIZE
];
2556 if (rdev
->sb_loaded
!= 1)
2557 continue; /* no noise on spare devices */
2559 if (!test_bit(Faulty
, &rdev
->flags
)) {
2560 md_super_write(mddev
,rdev
,
2561 rdev
->sb_start
, rdev
->sb_size
,
2563 pr_debug("md: (write) %s's sb offset: %llu\n",
2564 bdevname(rdev
->bdev
, b
),
2565 (unsigned long long)rdev
->sb_start
);
2566 rdev
->sb_events
= mddev
->events
;
2567 if (rdev
->badblocks
.size
) {
2568 md_super_write(mddev
, rdev
,
2569 rdev
->badblocks
.sector
,
2570 rdev
->badblocks
.size
<< 9,
2572 rdev
->badblocks
.size
= 0;
2576 pr_debug("md: %s (skipping faulty)\n",
2577 bdevname(rdev
->bdev
, b
));
2579 if (mddev
->level
== LEVEL_MULTIPATH
)
2580 /* only need to write one superblock... */
2583 if (md_super_wait(mddev
) < 0)
2585 /* if there was a failure, MD_SB_CHANGE_DEVS was set, and we re-write super */
2587 if (mddev_is_clustered(mddev
) && ret
== 0)
2588 md_cluster_ops
->metadata_update_finish(mddev
);
2590 if (mddev
->in_sync
!= sync_req
||
2591 !bit_clear_unless(&mddev
->sb_flags
, BIT(MD_SB_CHANGE_PENDING
),
2592 BIT(MD_SB_CHANGE_DEVS
) | BIT(MD_SB_CHANGE_CLEAN
)))
2593 /* have to write it out again */
2595 wake_up(&mddev
->sb_wait
);
2596 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
2597 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
2599 rdev_for_each(rdev
, mddev
) {
2600 if (test_and_clear_bit(FaultRecorded
, &rdev
->flags
))
2601 clear_bit(Blocked
, &rdev
->flags
);
2603 if (any_badblocks_changed
)
2604 ack_all_badblocks(&rdev
->badblocks
);
2605 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2606 wake_up(&rdev
->blocked_wait
);
2609 EXPORT_SYMBOL(md_update_sb
);
2611 static int add_bound_rdev(struct md_rdev
*rdev
)
2613 struct mddev
*mddev
= rdev
->mddev
;
2615 bool add_journal
= test_bit(Journal
, &rdev
->flags
);
2617 if (!mddev
->pers
->hot_remove_disk
|| add_journal
) {
2618 /* If there is hot_add_disk but no hot_remove_disk
2619 * then added disks for geometry changes,
2620 * and should be added immediately.
2622 super_types
[mddev
->major_version
].
2623 validate_super(mddev
, rdev
);
2625 mddev_suspend(mddev
);
2626 err
= mddev
->pers
->hot_add_disk(mddev
, rdev
);
2628 mddev_resume(mddev
);
2630 md_kick_rdev_from_array(rdev
);
2634 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2636 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
2637 if (mddev
->degraded
)
2638 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
2639 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
2640 md_new_event(mddev
);
2641 md_wakeup_thread(mddev
->thread
);
2645 /* words written to sysfs files may, or may not, be \n terminated.
2646 * We want to accept with case. For this we use cmd_match.
2648 static int cmd_match(const char *cmd
, const char *str
)
2650 /* See if cmd, written into a sysfs file, matches
2651 * str. They must either be the same, or cmd can
2652 * have a trailing newline
2654 while (*cmd
&& *str
&& *cmd
== *str
) {
2665 struct rdev_sysfs_entry
{
2666 struct attribute attr
;
2667 ssize_t (*show
)(struct md_rdev
*, char *);
2668 ssize_t (*store
)(struct md_rdev
*, const char *, size_t);
2672 state_show(struct md_rdev
*rdev
, char *page
)
2676 unsigned long flags
= READ_ONCE(rdev
->flags
);
2678 if (test_bit(Faulty
, &flags
) ||
2679 (!test_bit(ExternalBbl
, &flags
) &&
2680 rdev
->badblocks
.unacked_exist
))
2681 len
+= sprintf(page
+len
, "faulty%s", sep
);
2682 if (test_bit(In_sync
, &flags
))
2683 len
+= sprintf(page
+len
, "in_sync%s", sep
);
2684 if (test_bit(Journal
, &flags
))
2685 len
+= sprintf(page
+len
, "journal%s", sep
);
2686 if (test_bit(WriteMostly
, &flags
))
2687 len
+= sprintf(page
+len
, "write_mostly%s", sep
);
2688 if (test_bit(Blocked
, &flags
) ||
2689 (rdev
->badblocks
.unacked_exist
2690 && !test_bit(Faulty
, &flags
)))
2691 len
+= sprintf(page
+len
, "blocked%s", sep
);
2692 if (!test_bit(Faulty
, &flags
) &&
2693 !test_bit(Journal
, &flags
) &&
2694 !test_bit(In_sync
, &flags
))
2695 len
+= sprintf(page
+len
, "spare%s", sep
);
2696 if (test_bit(WriteErrorSeen
, &flags
))
2697 len
+= sprintf(page
+len
, "write_error%s", sep
);
2698 if (test_bit(WantReplacement
, &flags
))
2699 len
+= sprintf(page
+len
, "want_replacement%s", sep
);
2700 if (test_bit(Replacement
, &flags
))
2701 len
+= sprintf(page
+len
, "replacement%s", sep
);
2702 if (test_bit(ExternalBbl
, &flags
))
2703 len
+= sprintf(page
+len
, "external_bbl%s", sep
);
2704 if (test_bit(FailFast
, &flags
))
2705 len
+= sprintf(page
+len
, "failfast%s", sep
);
2710 return len
+sprintf(page
+len
, "\n");
2714 state_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2717 * faulty - simulates an error
2718 * remove - disconnects the device
2719 * writemostly - sets write_mostly
2720 * -writemostly - clears write_mostly
2721 * blocked - sets the Blocked flags
2722 * -blocked - clears the Blocked and possibly simulates an error
2723 * insync - sets Insync providing device isn't active
2724 * -insync - clear Insync for a device with a slot assigned,
2725 * so that it gets rebuilt based on bitmap
2726 * write_error - sets WriteErrorSeen
2727 * -write_error - clears WriteErrorSeen
2728 * {,-}failfast - set/clear FailFast
2731 if (cmd_match(buf
, "faulty") && rdev
->mddev
->pers
) {
2732 md_error(rdev
->mddev
, rdev
);
2733 if (test_bit(Faulty
, &rdev
->flags
))
2737 } else if (cmd_match(buf
, "remove")) {
2738 if (rdev
->mddev
->pers
) {
2739 clear_bit(Blocked
, &rdev
->flags
);
2740 remove_and_add_spares(rdev
->mddev
, rdev
);
2742 if (rdev
->raid_disk
>= 0)
2745 struct mddev
*mddev
= rdev
->mddev
;
2747 if (mddev_is_clustered(mddev
))
2748 err
= md_cluster_ops
->remove_disk(mddev
, rdev
);
2751 md_kick_rdev_from_array(rdev
);
2753 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
2754 md_wakeup_thread(mddev
->thread
);
2756 md_new_event(mddev
);
2759 } else if (cmd_match(buf
, "writemostly")) {
2760 set_bit(WriteMostly
, &rdev
->flags
);
2762 } else if (cmd_match(buf
, "-writemostly")) {
2763 clear_bit(WriteMostly
, &rdev
->flags
);
2765 } else if (cmd_match(buf
, "blocked")) {
2766 set_bit(Blocked
, &rdev
->flags
);
2768 } else if (cmd_match(buf
, "-blocked")) {
2769 if (!test_bit(Faulty
, &rdev
->flags
) &&
2770 !test_bit(ExternalBbl
, &rdev
->flags
) &&
2771 rdev
->badblocks
.unacked_exist
) {
2772 /* metadata handler doesn't understand badblocks,
2773 * so we need to fail the device
2775 md_error(rdev
->mddev
, rdev
);
2777 clear_bit(Blocked
, &rdev
->flags
);
2778 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2779 wake_up(&rdev
->blocked_wait
);
2780 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2781 md_wakeup_thread(rdev
->mddev
->thread
);
2784 } else if (cmd_match(buf
, "insync") && rdev
->raid_disk
== -1) {
2785 set_bit(In_sync
, &rdev
->flags
);
2787 } else if (cmd_match(buf
, "failfast")) {
2788 set_bit(FailFast
, &rdev
->flags
);
2790 } else if (cmd_match(buf
, "-failfast")) {
2791 clear_bit(FailFast
, &rdev
->flags
);
2793 } else if (cmd_match(buf
, "-insync") && rdev
->raid_disk
>= 0 &&
2794 !test_bit(Journal
, &rdev
->flags
)) {
2795 if (rdev
->mddev
->pers
== NULL
) {
2796 clear_bit(In_sync
, &rdev
->flags
);
2797 rdev
->saved_raid_disk
= rdev
->raid_disk
;
2798 rdev
->raid_disk
= -1;
2801 } else if (cmd_match(buf
, "write_error")) {
2802 set_bit(WriteErrorSeen
, &rdev
->flags
);
2804 } else if (cmd_match(buf
, "-write_error")) {
2805 clear_bit(WriteErrorSeen
, &rdev
->flags
);
2807 } else if (cmd_match(buf
, "want_replacement")) {
2808 /* Any non-spare device that is not a replacement can
2809 * become want_replacement at any time, but we then need to
2810 * check if recovery is needed.
2812 if (rdev
->raid_disk
>= 0 &&
2813 !test_bit(Journal
, &rdev
->flags
) &&
2814 !test_bit(Replacement
, &rdev
->flags
))
2815 set_bit(WantReplacement
, &rdev
->flags
);
2816 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2817 md_wakeup_thread(rdev
->mddev
->thread
);
2819 } else if (cmd_match(buf
, "-want_replacement")) {
2820 /* Clearing 'want_replacement' is always allowed.
2821 * Once replacements starts it is too late though.
2824 clear_bit(WantReplacement
, &rdev
->flags
);
2825 } else if (cmd_match(buf
, "replacement")) {
2826 /* Can only set a device as a replacement when array has not
2827 * yet been started. Once running, replacement is automatic
2828 * from spares, or by assigning 'slot'.
2830 if (rdev
->mddev
->pers
)
2833 set_bit(Replacement
, &rdev
->flags
);
2836 } else if (cmd_match(buf
, "-replacement")) {
2837 /* Similarly, can only clear Replacement before start */
2838 if (rdev
->mddev
->pers
)
2841 clear_bit(Replacement
, &rdev
->flags
);
2844 } else if (cmd_match(buf
, "re-add")) {
2845 if (!rdev
->mddev
->pers
)
2847 else if (test_bit(Faulty
, &rdev
->flags
) && (rdev
->raid_disk
== -1) &&
2848 rdev
->saved_raid_disk
>= 0) {
2849 /* clear_bit is performed _after_ all the devices
2850 * have their local Faulty bit cleared. If any writes
2851 * happen in the meantime in the local node, they
2852 * will land in the local bitmap, which will be synced
2853 * by this node eventually
2855 if (!mddev_is_clustered(rdev
->mddev
) ||
2856 (err
= md_cluster_ops
->gather_bitmaps(rdev
)) == 0) {
2857 clear_bit(Faulty
, &rdev
->flags
);
2858 err
= add_bound_rdev(rdev
);
2862 } else if (cmd_match(buf
, "external_bbl") && (rdev
->mddev
->external
)) {
2863 set_bit(ExternalBbl
, &rdev
->flags
);
2864 rdev
->badblocks
.shift
= 0;
2866 } else if (cmd_match(buf
, "-external_bbl") && (rdev
->mddev
->external
)) {
2867 clear_bit(ExternalBbl
, &rdev
->flags
);
2871 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2872 return err
? err
: len
;
2874 static struct rdev_sysfs_entry rdev_state
=
2875 __ATTR_PREALLOC(state
, S_IRUGO
|S_IWUSR
, state_show
, state_store
);
2878 errors_show(struct md_rdev
*rdev
, char *page
)
2880 return sprintf(page
, "%d\n", atomic_read(&rdev
->corrected_errors
));
2884 errors_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2889 rv
= kstrtouint(buf
, 10, &n
);
2892 atomic_set(&rdev
->corrected_errors
, n
);
2895 static struct rdev_sysfs_entry rdev_errors
=
2896 __ATTR(errors
, S_IRUGO
|S_IWUSR
, errors_show
, errors_store
);
2899 slot_show(struct md_rdev
*rdev
, char *page
)
2901 if (test_bit(Journal
, &rdev
->flags
))
2902 return sprintf(page
, "journal\n");
2903 else if (rdev
->raid_disk
< 0)
2904 return sprintf(page
, "none\n");
2906 return sprintf(page
, "%d\n", rdev
->raid_disk
);
2910 slot_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2915 if (test_bit(Journal
, &rdev
->flags
))
2917 if (strncmp(buf
, "none", 4)==0)
2920 err
= kstrtouint(buf
, 10, (unsigned int *)&slot
);
2924 if (rdev
->mddev
->pers
&& slot
== -1) {
2925 /* Setting 'slot' on an active array requires also
2926 * updating the 'rd%d' link, and communicating
2927 * with the personality with ->hot_*_disk.
2928 * For now we only support removing
2929 * failed/spare devices. This normally happens automatically,
2930 * but not when the metadata is externally managed.
2932 if (rdev
->raid_disk
== -1)
2934 /* personality does all needed checks */
2935 if (rdev
->mddev
->pers
->hot_remove_disk
== NULL
)
2937 clear_bit(Blocked
, &rdev
->flags
);
2938 remove_and_add_spares(rdev
->mddev
, rdev
);
2939 if (rdev
->raid_disk
>= 0)
2941 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2942 md_wakeup_thread(rdev
->mddev
->thread
);
2943 } else if (rdev
->mddev
->pers
) {
2944 /* Activating a spare .. or possibly reactivating
2945 * if we ever get bitmaps working here.
2949 if (rdev
->raid_disk
!= -1)
2952 if (test_bit(MD_RECOVERY_RUNNING
, &rdev
->mddev
->recovery
))
2955 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
2958 if (slot
>= rdev
->mddev
->raid_disks
&&
2959 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
2962 rdev
->raid_disk
= slot
;
2963 if (test_bit(In_sync
, &rdev
->flags
))
2964 rdev
->saved_raid_disk
= slot
;
2966 rdev
->saved_raid_disk
= -1;
2967 clear_bit(In_sync
, &rdev
->flags
);
2968 clear_bit(Bitmap_sync
, &rdev
->flags
);
2969 err
= rdev
->mddev
->pers
->
2970 hot_add_disk(rdev
->mddev
, rdev
);
2972 rdev
->raid_disk
= -1;
2975 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2976 if (sysfs_link_rdev(rdev
->mddev
, rdev
))
2977 /* failure here is OK */;
2978 /* don't wakeup anyone, leave that to userspace. */
2980 if (slot
>= rdev
->mddev
->raid_disks
&&
2981 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
2983 rdev
->raid_disk
= slot
;
2984 /* assume it is working */
2985 clear_bit(Faulty
, &rdev
->flags
);
2986 clear_bit(WriteMostly
, &rdev
->flags
);
2987 set_bit(In_sync
, &rdev
->flags
);
2988 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2993 static struct rdev_sysfs_entry rdev_slot
=
2994 __ATTR(slot
, S_IRUGO
|S_IWUSR
, slot_show
, slot_store
);
2997 offset_show(struct md_rdev
*rdev
, char *page
)
2999 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->data_offset
);
3003 offset_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3005 unsigned long long offset
;
3006 if (kstrtoull(buf
, 10, &offset
) < 0)
3008 if (rdev
->mddev
->pers
&& rdev
->raid_disk
>= 0)
3010 if (rdev
->sectors
&& rdev
->mddev
->external
)
3011 /* Must set offset before size, so overlap checks
3014 rdev
->data_offset
= offset
;
3015 rdev
->new_data_offset
= offset
;
3019 static struct rdev_sysfs_entry rdev_offset
=
3020 __ATTR(offset
, S_IRUGO
|S_IWUSR
, offset_show
, offset_store
);
3022 static ssize_t
new_offset_show(struct md_rdev
*rdev
, char *page
)
3024 return sprintf(page
, "%llu\n",
3025 (unsigned long long)rdev
->new_data_offset
);
3028 static ssize_t
new_offset_store(struct md_rdev
*rdev
,
3029 const char *buf
, size_t len
)
3031 unsigned long long new_offset
;
3032 struct mddev
*mddev
= rdev
->mddev
;
3034 if (kstrtoull(buf
, 10, &new_offset
) < 0)
3037 if (mddev
->sync_thread
||
3038 test_bit(MD_RECOVERY_RUNNING
,&mddev
->recovery
))
3040 if (new_offset
== rdev
->data_offset
)
3041 /* reset is always permitted */
3043 else if (new_offset
> rdev
->data_offset
) {
3044 /* must not push array size beyond rdev_sectors */
3045 if (new_offset
- rdev
->data_offset
3046 + mddev
->dev_sectors
> rdev
->sectors
)
3049 /* Metadata worries about other space details. */
3051 /* decreasing the offset is inconsistent with a backwards
3054 if (new_offset
< rdev
->data_offset
&&
3055 mddev
->reshape_backwards
)
3057 /* Increasing offset is inconsistent with forwards
3058 * reshape. reshape_direction should be set to
3059 * 'backwards' first.
3061 if (new_offset
> rdev
->data_offset
&&
3062 !mddev
->reshape_backwards
)
3065 if (mddev
->pers
&& mddev
->persistent
&&
3066 !super_types
[mddev
->major_version
]
3067 .allow_new_offset(rdev
, new_offset
))
3069 rdev
->new_data_offset
= new_offset
;
3070 if (new_offset
> rdev
->data_offset
)
3071 mddev
->reshape_backwards
= 1;
3072 else if (new_offset
< rdev
->data_offset
)
3073 mddev
->reshape_backwards
= 0;
3077 static struct rdev_sysfs_entry rdev_new_offset
=
3078 __ATTR(new_offset
, S_IRUGO
|S_IWUSR
, new_offset_show
, new_offset_store
);
3081 rdev_size_show(struct md_rdev
*rdev
, char *page
)
3083 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->sectors
/ 2);
3086 static int overlaps(sector_t s1
, sector_t l1
, sector_t s2
, sector_t l2
)
3088 /* check if two start/length pairs overlap */
3096 static int strict_blocks_to_sectors(const char *buf
, sector_t
*sectors
)
3098 unsigned long long blocks
;
3101 if (kstrtoull(buf
, 10, &blocks
) < 0)
3104 if (blocks
& 1ULL << (8 * sizeof(blocks
) - 1))
3105 return -EINVAL
; /* sector conversion overflow */
3108 if (new != blocks
* 2)
3109 return -EINVAL
; /* unsigned long long to sector_t overflow */
3116 rdev_size_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3118 struct mddev
*my_mddev
= rdev
->mddev
;
3119 sector_t oldsectors
= rdev
->sectors
;
3122 if (test_bit(Journal
, &rdev
->flags
))
3124 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
3126 if (rdev
->data_offset
!= rdev
->new_data_offset
)
3127 return -EINVAL
; /* too confusing */
3128 if (my_mddev
->pers
&& rdev
->raid_disk
>= 0) {
3129 if (my_mddev
->persistent
) {
3130 sectors
= super_types
[my_mddev
->major_version
].
3131 rdev_size_change(rdev
, sectors
);
3134 } else if (!sectors
)
3135 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) -
3137 if (!my_mddev
->pers
->resize
)
3138 /* Cannot change size for RAID0 or Linear etc */
3141 if (sectors
< my_mddev
->dev_sectors
)
3142 return -EINVAL
; /* component must fit device */
3144 rdev
->sectors
= sectors
;
3145 if (sectors
> oldsectors
&& my_mddev
->external
) {
3146 /* Need to check that all other rdevs with the same
3147 * ->bdev do not overlap. 'rcu' is sufficient to walk
3148 * the rdev lists safely.
3149 * This check does not provide a hard guarantee, it
3150 * just helps avoid dangerous mistakes.
3152 struct mddev
*mddev
;
3154 struct list_head
*tmp
;
3157 for_each_mddev(mddev
, tmp
) {
3158 struct md_rdev
*rdev2
;
3160 rdev_for_each(rdev2
, mddev
)
3161 if (rdev
->bdev
== rdev2
->bdev
&&
3163 overlaps(rdev
->data_offset
, rdev
->sectors
,
3176 /* Someone else could have slipped in a size
3177 * change here, but doing so is just silly.
3178 * We put oldsectors back because we *know* it is
3179 * safe, and trust userspace not to race with
3182 rdev
->sectors
= oldsectors
;
3189 static struct rdev_sysfs_entry rdev_size
=
3190 __ATTR(size
, S_IRUGO
|S_IWUSR
, rdev_size_show
, rdev_size_store
);
3192 static ssize_t
recovery_start_show(struct md_rdev
*rdev
, char *page
)
3194 unsigned long long recovery_start
= rdev
->recovery_offset
;
3196 if (test_bit(In_sync
, &rdev
->flags
) ||
3197 recovery_start
== MaxSector
)
3198 return sprintf(page
, "none\n");
3200 return sprintf(page
, "%llu\n", recovery_start
);
3203 static ssize_t
recovery_start_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3205 unsigned long long recovery_start
;
3207 if (cmd_match(buf
, "none"))
3208 recovery_start
= MaxSector
;
3209 else if (kstrtoull(buf
, 10, &recovery_start
))
3212 if (rdev
->mddev
->pers
&&
3213 rdev
->raid_disk
>= 0)
3216 rdev
->recovery_offset
= recovery_start
;
3217 if (recovery_start
== MaxSector
)
3218 set_bit(In_sync
, &rdev
->flags
);
3220 clear_bit(In_sync
, &rdev
->flags
);
3224 static struct rdev_sysfs_entry rdev_recovery_start
=
3225 __ATTR(recovery_start
, S_IRUGO
|S_IWUSR
, recovery_start_show
, recovery_start_store
);
3227 /* sysfs access to bad-blocks list.
3228 * We present two files.
3229 * 'bad-blocks' lists sector numbers and lengths of ranges that
3230 * are recorded as bad. The list is truncated to fit within
3231 * the one-page limit of sysfs.
3232 * Writing "sector length" to this file adds an acknowledged
3234 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
3235 * been acknowledged. Writing to this file adds bad blocks
3236 * without acknowledging them. This is largely for testing.
3238 static ssize_t
bb_show(struct md_rdev
*rdev
, char *page
)
3240 return badblocks_show(&rdev
->badblocks
, page
, 0);
3242 static ssize_t
bb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
3244 int rv
= badblocks_store(&rdev
->badblocks
, page
, len
, 0);
3245 /* Maybe that ack was all we needed */
3246 if (test_and_clear_bit(BlockedBadBlocks
, &rdev
->flags
))
3247 wake_up(&rdev
->blocked_wait
);
3250 static struct rdev_sysfs_entry rdev_bad_blocks
=
3251 __ATTR(bad_blocks
, S_IRUGO
|S_IWUSR
, bb_show
, bb_store
);
3253 static ssize_t
ubb_show(struct md_rdev
*rdev
, char *page
)
3255 return badblocks_show(&rdev
->badblocks
, page
, 1);
3257 static ssize_t
ubb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
3259 return badblocks_store(&rdev
->badblocks
, page
, len
, 1);
3261 static struct rdev_sysfs_entry rdev_unack_bad_blocks
=
3262 __ATTR(unacknowledged_bad_blocks
, S_IRUGO
|S_IWUSR
, ubb_show
, ubb_store
);
3265 ppl_sector_show(struct md_rdev
*rdev
, char *page
)
3267 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->ppl
.sector
);
3271 ppl_sector_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3273 unsigned long long sector
;
3275 if (kstrtoull(buf
, 10, §or
) < 0)
3277 if (sector
!= (sector_t
)sector
)
3280 if (rdev
->mddev
->pers
&& test_bit(MD_HAS_PPL
, &rdev
->mddev
->flags
) &&
3281 rdev
->raid_disk
>= 0)
3284 if (rdev
->mddev
->persistent
) {
3285 if (rdev
->mddev
->major_version
== 0)
3287 if ((sector
> rdev
->sb_start
&&
3288 sector
- rdev
->sb_start
> S16_MAX
) ||
3289 (sector
< rdev
->sb_start
&&
3290 rdev
->sb_start
- sector
> -S16_MIN
))
3292 rdev
->ppl
.offset
= sector
- rdev
->sb_start
;
3293 } else if (!rdev
->mddev
->external
) {
3296 rdev
->ppl
.sector
= sector
;
3300 static struct rdev_sysfs_entry rdev_ppl_sector
=
3301 __ATTR(ppl_sector
, S_IRUGO
|S_IWUSR
, ppl_sector_show
, ppl_sector_store
);
3304 ppl_size_show(struct md_rdev
*rdev
, char *page
)
3306 return sprintf(page
, "%u\n", rdev
->ppl
.size
);
3310 ppl_size_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3314 if (kstrtouint(buf
, 10, &size
) < 0)
3317 if (rdev
->mddev
->pers
&& test_bit(MD_HAS_PPL
, &rdev
->mddev
->flags
) &&
3318 rdev
->raid_disk
>= 0)
3321 if (rdev
->mddev
->persistent
) {
3322 if (rdev
->mddev
->major_version
== 0)
3326 } else if (!rdev
->mddev
->external
) {
3329 rdev
->ppl
.size
= size
;
3333 static struct rdev_sysfs_entry rdev_ppl_size
=
3334 __ATTR(ppl_size
, S_IRUGO
|S_IWUSR
, ppl_size_show
, ppl_size_store
);
3336 static struct attribute
*rdev_default_attrs
[] = {
3341 &rdev_new_offset
.attr
,
3343 &rdev_recovery_start
.attr
,
3344 &rdev_bad_blocks
.attr
,
3345 &rdev_unack_bad_blocks
.attr
,
3346 &rdev_ppl_sector
.attr
,
3347 &rdev_ppl_size
.attr
,
3351 rdev_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
3353 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
3354 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
3360 return entry
->show(rdev
, page
);
3364 rdev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
3365 const char *page
, size_t length
)
3367 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
3368 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
3370 struct mddev
*mddev
= rdev
->mddev
;
3374 if (!capable(CAP_SYS_ADMIN
))
3376 rv
= mddev
? mddev_lock(mddev
) : -ENODEV
;
3378 if (rdev
->mddev
== NULL
)
3381 rv
= entry
->store(rdev
, page
, length
);
3382 mddev_unlock(mddev
);
3387 static void rdev_free(struct kobject
*ko
)
3389 struct md_rdev
*rdev
= container_of(ko
, struct md_rdev
, kobj
);
3392 static const struct sysfs_ops rdev_sysfs_ops
= {
3393 .show
= rdev_attr_show
,
3394 .store
= rdev_attr_store
,
3396 static struct kobj_type rdev_ktype
= {
3397 .release
= rdev_free
,
3398 .sysfs_ops
= &rdev_sysfs_ops
,
3399 .default_attrs
= rdev_default_attrs
,
3402 int md_rdev_init(struct md_rdev
*rdev
)
3405 rdev
->saved_raid_disk
= -1;
3406 rdev
->raid_disk
= -1;
3408 rdev
->data_offset
= 0;
3409 rdev
->new_data_offset
= 0;
3410 rdev
->sb_events
= 0;
3411 rdev
->last_read_error
= 0;
3412 rdev
->sb_loaded
= 0;
3413 rdev
->bb_page
= NULL
;
3414 atomic_set(&rdev
->nr_pending
, 0);
3415 atomic_set(&rdev
->read_errors
, 0);
3416 atomic_set(&rdev
->corrected_errors
, 0);
3418 INIT_LIST_HEAD(&rdev
->same_set
);
3419 init_waitqueue_head(&rdev
->blocked_wait
);
3421 /* Add space to store bad block list.
3422 * This reserves the space even on arrays where it cannot
3423 * be used - I wonder if that matters
3425 return badblocks_init(&rdev
->badblocks
, 0);
3427 EXPORT_SYMBOL_GPL(md_rdev_init
);
3429 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3431 * mark the device faulty if:
3433 * - the device is nonexistent (zero size)
3434 * - the device has no valid superblock
3436 * a faulty rdev _never_ has rdev->sb set.
3438 static struct md_rdev
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
3440 char b
[BDEVNAME_SIZE
];
3442 struct md_rdev
*rdev
;
3445 rdev
= kzalloc(sizeof(*rdev
), GFP_KERNEL
);
3447 return ERR_PTR(-ENOMEM
);
3449 err
= md_rdev_init(rdev
);
3452 err
= alloc_disk_sb(rdev
);
3456 err
= lock_rdev(rdev
, newdev
, super_format
== -2);
3460 kobject_init(&rdev
->kobj
, &rdev_ktype
);
3462 size
= i_size_read(rdev
->bdev
->bd_inode
) >> BLOCK_SIZE_BITS
;
3464 pr_warn("md: %s has zero or unknown size, marking faulty!\n",
3465 bdevname(rdev
->bdev
,b
));
3470 if (super_format
>= 0) {
3471 err
= super_types
[super_format
].
3472 load_super(rdev
, NULL
, super_minor
);
3473 if (err
== -EINVAL
) {
3474 pr_warn("md: %s does not have a valid v%d.%d superblock, not importing!\n",
3475 bdevname(rdev
->bdev
,b
),
3476 super_format
, super_minor
);
3480 pr_warn("md: could not read %s's sb, not importing!\n",
3481 bdevname(rdev
->bdev
,b
));
3491 md_rdev_clear(rdev
);
3493 return ERR_PTR(err
);
3497 * Check a full RAID array for plausibility
3500 static void analyze_sbs(struct mddev
*mddev
)
3503 struct md_rdev
*rdev
, *freshest
, *tmp
;
3504 char b
[BDEVNAME_SIZE
];
3507 rdev_for_each_safe(rdev
, tmp
, mddev
)
3508 switch (super_types
[mddev
->major_version
].
3509 load_super(rdev
, freshest
, mddev
->minor_version
)) {
3516 pr_warn("md: fatal superblock inconsistency in %s -- removing from array\n",
3517 bdevname(rdev
->bdev
,b
));
3518 md_kick_rdev_from_array(rdev
);
3521 super_types
[mddev
->major_version
].
3522 validate_super(mddev
, freshest
);
3525 rdev_for_each_safe(rdev
, tmp
, mddev
) {
3526 if (mddev
->max_disks
&&
3527 (rdev
->desc_nr
>= mddev
->max_disks
||
3528 i
> mddev
->max_disks
)) {
3529 pr_warn("md: %s: %s: only %d devices permitted\n",
3530 mdname(mddev
), bdevname(rdev
->bdev
, b
),
3532 md_kick_rdev_from_array(rdev
);
3535 if (rdev
!= freshest
) {
3536 if (super_types
[mddev
->major_version
].
3537 validate_super(mddev
, rdev
)) {
3538 pr_warn("md: kicking non-fresh %s from array!\n",
3539 bdevname(rdev
->bdev
,b
));
3540 md_kick_rdev_from_array(rdev
);
3544 if (mddev
->level
== LEVEL_MULTIPATH
) {
3545 rdev
->desc_nr
= i
++;
3546 rdev
->raid_disk
= rdev
->desc_nr
;
3547 set_bit(In_sync
, &rdev
->flags
);
3548 } else if (rdev
->raid_disk
>=
3549 (mddev
->raid_disks
- min(0, mddev
->delta_disks
)) &&
3550 !test_bit(Journal
, &rdev
->flags
)) {
3551 rdev
->raid_disk
= -1;
3552 clear_bit(In_sync
, &rdev
->flags
);
3557 /* Read a fixed-point number.
3558 * Numbers in sysfs attributes should be in "standard" units where
3559 * possible, so time should be in seconds.
3560 * However we internally use a a much smaller unit such as
3561 * milliseconds or jiffies.
3562 * This function takes a decimal number with a possible fractional
3563 * component, and produces an integer which is the result of
3564 * multiplying that number by 10^'scale'.
3565 * all without any floating-point arithmetic.
3567 int strict_strtoul_scaled(const char *cp
, unsigned long *res
, int scale
)
3569 unsigned long result
= 0;
3571 while (isdigit(*cp
) || (*cp
== '.' && decimals
< 0)) {
3574 else if (decimals
< scale
) {
3577 result
= result
* 10 + value
;
3589 while (decimals
< scale
) {
3598 safe_delay_show(struct mddev
*mddev
, char *page
)
3600 int msec
= (mddev
->safemode_delay
*1000)/HZ
;
3601 return sprintf(page
, "%d.%03d\n", msec
/1000, msec
%1000);
3604 safe_delay_store(struct mddev
*mddev
, const char *cbuf
, size_t len
)
3608 if (mddev_is_clustered(mddev
)) {
3609 pr_warn("md: Safemode is disabled for clustered mode\n");
3613 if (strict_strtoul_scaled(cbuf
, &msec
, 3) < 0)
3616 mddev
->safemode_delay
= 0;
3618 unsigned long old_delay
= mddev
->safemode_delay
;
3619 unsigned long new_delay
= (msec
*HZ
)/1000;
3623 mddev
->safemode_delay
= new_delay
;
3624 if (new_delay
< old_delay
|| old_delay
== 0)
3625 mod_timer(&mddev
->safemode_timer
, jiffies
+1);
3629 static struct md_sysfs_entry md_safe_delay
=
3630 __ATTR(safe_mode_delay
, S_IRUGO
|S_IWUSR
,safe_delay_show
, safe_delay_store
);
3633 level_show(struct mddev
*mddev
, char *page
)
3635 struct md_personality
*p
;
3637 spin_lock(&mddev
->lock
);
3640 ret
= sprintf(page
, "%s\n", p
->name
);
3641 else if (mddev
->clevel
[0])
3642 ret
= sprintf(page
, "%s\n", mddev
->clevel
);
3643 else if (mddev
->level
!= LEVEL_NONE
)
3644 ret
= sprintf(page
, "%d\n", mddev
->level
);
3647 spin_unlock(&mddev
->lock
);
3652 level_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3657 struct md_personality
*pers
, *oldpers
;
3659 void *priv
, *oldpriv
;
3660 struct md_rdev
*rdev
;
3662 if (slen
== 0 || slen
>= sizeof(clevel
))
3665 rv
= mddev_lock(mddev
);
3669 if (mddev
->pers
== NULL
) {
3670 strncpy(mddev
->clevel
, buf
, slen
);
3671 if (mddev
->clevel
[slen
-1] == '\n')
3673 mddev
->clevel
[slen
] = 0;
3674 mddev
->level
= LEVEL_NONE
;
3682 /* request to change the personality. Need to ensure:
3683 * - array is not engaged in resync/recovery/reshape
3684 * - old personality can be suspended
3685 * - new personality will access other array.
3689 if (mddev
->sync_thread
||
3690 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
3691 mddev
->reshape_position
!= MaxSector
||
3692 mddev
->sysfs_active
)
3696 if (!mddev
->pers
->quiesce
) {
3697 pr_warn("md: %s: %s does not support online personality change\n",
3698 mdname(mddev
), mddev
->pers
->name
);
3702 /* Now find the new personality */
3703 strncpy(clevel
, buf
, slen
);
3704 if (clevel
[slen
-1] == '\n')
3707 if (kstrtol(clevel
, 10, &level
))
3710 if (request_module("md-%s", clevel
) != 0)
3711 request_module("md-level-%s", clevel
);
3712 spin_lock(&pers_lock
);
3713 pers
= find_pers(level
, clevel
);
3714 if (!pers
|| !try_module_get(pers
->owner
)) {
3715 spin_unlock(&pers_lock
);
3716 pr_warn("md: personality %s not loaded\n", clevel
);
3720 spin_unlock(&pers_lock
);
3722 if (pers
== mddev
->pers
) {
3723 /* Nothing to do! */
3724 module_put(pers
->owner
);
3728 if (!pers
->takeover
) {
3729 module_put(pers
->owner
);
3730 pr_warn("md: %s: %s does not support personality takeover\n",
3731 mdname(mddev
), clevel
);
3736 rdev_for_each(rdev
, mddev
)
3737 rdev
->new_raid_disk
= rdev
->raid_disk
;
3739 /* ->takeover must set new_* and/or delta_disks
3740 * if it succeeds, and may set them when it fails.
3742 priv
= pers
->takeover(mddev
);
3744 mddev
->new_level
= mddev
->level
;
3745 mddev
->new_layout
= mddev
->layout
;
3746 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3747 mddev
->raid_disks
-= mddev
->delta_disks
;
3748 mddev
->delta_disks
= 0;
3749 mddev
->reshape_backwards
= 0;
3750 module_put(pers
->owner
);
3751 pr_warn("md: %s: %s would not accept array\n",
3752 mdname(mddev
), clevel
);
3757 /* Looks like we have a winner */
3758 mddev_suspend(mddev
);
3759 mddev_detach(mddev
);
3761 spin_lock(&mddev
->lock
);
3762 oldpers
= mddev
->pers
;
3763 oldpriv
= mddev
->private;
3765 mddev
->private = priv
;
3766 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
3767 mddev
->level
= mddev
->new_level
;
3768 mddev
->layout
= mddev
->new_layout
;
3769 mddev
->chunk_sectors
= mddev
->new_chunk_sectors
;
3770 mddev
->delta_disks
= 0;
3771 mddev
->reshape_backwards
= 0;
3772 mddev
->degraded
= 0;
3773 spin_unlock(&mddev
->lock
);
3775 if (oldpers
->sync_request
== NULL
&&
3777 /* We are converting from a no-redundancy array
3778 * to a redundancy array and metadata is managed
3779 * externally so we need to be sure that writes
3780 * won't block due to a need to transition
3782 * until external management is started.
3785 mddev
->safemode_delay
= 0;
3786 mddev
->safemode
= 0;
3789 oldpers
->free(mddev
, oldpriv
);
3791 if (oldpers
->sync_request
== NULL
&&
3792 pers
->sync_request
!= NULL
) {
3793 /* need to add the md_redundancy_group */
3794 if (sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
3795 pr_warn("md: cannot register extra attributes for %s\n",
3797 mddev
->sysfs_action
= sysfs_get_dirent(mddev
->kobj
.sd
, "sync_action");
3799 if (oldpers
->sync_request
!= NULL
&&
3800 pers
->sync_request
== NULL
) {
3801 /* need to remove the md_redundancy_group */
3802 if (mddev
->to_remove
== NULL
)
3803 mddev
->to_remove
= &md_redundancy_group
;
3806 module_put(oldpers
->owner
);
3808 rdev_for_each(rdev
, mddev
) {
3809 if (rdev
->raid_disk
< 0)
3811 if (rdev
->new_raid_disk
>= mddev
->raid_disks
)
3812 rdev
->new_raid_disk
= -1;
3813 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3815 sysfs_unlink_rdev(mddev
, rdev
);
3817 rdev_for_each(rdev
, mddev
) {
3818 if (rdev
->raid_disk
< 0)
3820 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3822 rdev
->raid_disk
= rdev
->new_raid_disk
;
3823 if (rdev
->raid_disk
< 0)
3824 clear_bit(In_sync
, &rdev
->flags
);
3826 if (sysfs_link_rdev(mddev
, rdev
))
3827 pr_warn("md: cannot register rd%d for %s after level change\n",
3828 rdev
->raid_disk
, mdname(mddev
));
3832 if (pers
->sync_request
== NULL
) {
3833 /* this is now an array without redundancy, so
3834 * it must always be in_sync
3837 del_timer_sync(&mddev
->safemode_timer
);
3839 blk_set_stacking_limits(&mddev
->queue
->limits
);
3841 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
3842 mddev_resume(mddev
);
3844 md_update_sb(mddev
, 1);
3845 sysfs_notify(&mddev
->kobj
, NULL
, "level");
3846 md_new_event(mddev
);
3849 mddev_unlock(mddev
);
3853 static struct md_sysfs_entry md_level
=
3854 __ATTR(level
, S_IRUGO
|S_IWUSR
, level_show
, level_store
);
3857 layout_show(struct mddev
*mddev
, char *page
)
3859 /* just a number, not meaningful for all levels */
3860 if (mddev
->reshape_position
!= MaxSector
&&
3861 mddev
->layout
!= mddev
->new_layout
)
3862 return sprintf(page
, "%d (%d)\n",
3863 mddev
->new_layout
, mddev
->layout
);
3864 return sprintf(page
, "%d\n", mddev
->layout
);
3868 layout_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3873 err
= kstrtouint(buf
, 10, &n
);
3876 err
= mddev_lock(mddev
);
3881 if (mddev
->pers
->check_reshape
== NULL
)
3886 mddev
->new_layout
= n
;
3887 err
= mddev
->pers
->check_reshape(mddev
);
3889 mddev
->new_layout
= mddev
->layout
;
3892 mddev
->new_layout
= n
;
3893 if (mddev
->reshape_position
== MaxSector
)
3896 mddev_unlock(mddev
);
3899 static struct md_sysfs_entry md_layout
=
3900 __ATTR(layout
, S_IRUGO
|S_IWUSR
, layout_show
, layout_store
);
3903 raid_disks_show(struct mddev
*mddev
, char *page
)
3905 if (mddev
->raid_disks
== 0)
3907 if (mddev
->reshape_position
!= MaxSector
&&
3908 mddev
->delta_disks
!= 0)
3909 return sprintf(page
, "%d (%d)\n", mddev
->raid_disks
,
3910 mddev
->raid_disks
- mddev
->delta_disks
);
3911 return sprintf(page
, "%d\n", mddev
->raid_disks
);
3914 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
);
3917 raid_disks_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3922 err
= kstrtouint(buf
, 10, &n
);
3926 err
= mddev_lock(mddev
);
3930 err
= update_raid_disks(mddev
, n
);
3931 else if (mddev
->reshape_position
!= MaxSector
) {
3932 struct md_rdev
*rdev
;
3933 int olddisks
= mddev
->raid_disks
- mddev
->delta_disks
;
3936 rdev_for_each(rdev
, mddev
) {
3938 rdev
->data_offset
< rdev
->new_data_offset
)
3941 rdev
->data_offset
> rdev
->new_data_offset
)
3945 mddev
->delta_disks
= n
- olddisks
;
3946 mddev
->raid_disks
= n
;
3947 mddev
->reshape_backwards
= (mddev
->delta_disks
< 0);
3949 mddev
->raid_disks
= n
;
3951 mddev_unlock(mddev
);
3952 return err
? err
: len
;
3954 static struct md_sysfs_entry md_raid_disks
=
3955 __ATTR(raid_disks
, S_IRUGO
|S_IWUSR
, raid_disks_show
, raid_disks_store
);
3958 chunk_size_show(struct mddev
*mddev
, char *page
)
3960 if (mddev
->reshape_position
!= MaxSector
&&
3961 mddev
->chunk_sectors
!= mddev
->new_chunk_sectors
)
3962 return sprintf(page
, "%d (%d)\n",
3963 mddev
->new_chunk_sectors
<< 9,
3964 mddev
->chunk_sectors
<< 9);
3965 return sprintf(page
, "%d\n", mddev
->chunk_sectors
<< 9);
3969 chunk_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3974 err
= kstrtoul(buf
, 10, &n
);
3978 err
= mddev_lock(mddev
);
3982 if (mddev
->pers
->check_reshape
== NULL
)
3987 mddev
->new_chunk_sectors
= n
>> 9;
3988 err
= mddev
->pers
->check_reshape(mddev
);
3990 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3993 mddev
->new_chunk_sectors
= n
>> 9;
3994 if (mddev
->reshape_position
== MaxSector
)
3995 mddev
->chunk_sectors
= n
>> 9;
3997 mddev_unlock(mddev
);
4000 static struct md_sysfs_entry md_chunk_size
=
4001 __ATTR(chunk_size
, S_IRUGO
|S_IWUSR
, chunk_size_show
, chunk_size_store
);
4004 resync_start_show(struct mddev
*mddev
, char *page
)
4006 if (mddev
->recovery_cp
== MaxSector
)
4007 return sprintf(page
, "none\n");
4008 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->recovery_cp
);
4012 resync_start_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4014 unsigned long long n
;
4017 if (cmd_match(buf
, "none"))
4020 err
= kstrtoull(buf
, 10, &n
);
4023 if (n
!= (sector_t
)n
)
4027 err
= mddev_lock(mddev
);
4030 if (mddev
->pers
&& !test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
4034 mddev
->recovery_cp
= n
;
4036 set_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
4038 mddev_unlock(mddev
);
4041 static struct md_sysfs_entry md_resync_start
=
4042 __ATTR_PREALLOC(resync_start
, S_IRUGO
|S_IWUSR
,
4043 resync_start_show
, resync_start_store
);
4046 * The array state can be:
4049 * No devices, no size, no level
4050 * Equivalent to STOP_ARRAY ioctl
4052 * May have some settings, but array is not active
4053 * all IO results in error
4054 * When written, doesn't tear down array, but just stops it
4055 * suspended (not supported yet)
4056 * All IO requests will block. The array can be reconfigured.
4057 * Writing this, if accepted, will block until array is quiescent
4059 * no resync can happen. no superblocks get written.
4060 * write requests fail
4062 * like readonly, but behaves like 'clean' on a write request.
4064 * clean - no pending writes, but otherwise active.
4065 * When written to inactive array, starts without resync
4066 * If a write request arrives then
4067 * if metadata is known, mark 'dirty' and switch to 'active'.
4068 * if not known, block and switch to write-pending
4069 * If written to an active array that has pending writes, then fails.
4071 * fully active: IO and resync can be happening.
4072 * When written to inactive array, starts with resync
4075 * clean, but writes are blocked waiting for 'active' to be written.
4078 * like active, but no writes have been seen for a while (100msec).
4081 enum array_state
{ clear
, inactive
, suspended
, readonly
, read_auto
, clean
, active
,
4082 write_pending
, active_idle
, bad_word
};
4083 static char *array_states
[] = {
4084 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
4085 "write-pending", "active-idle", NULL
};
4087 static int match_word(const char *word
, char **list
)
4090 for (n
=0; list
[n
]; n
++)
4091 if (cmd_match(word
, list
[n
]))
4097 array_state_show(struct mddev
*mddev
, char *page
)
4099 enum array_state st
= inactive
;
4110 spin_lock(&mddev
->lock
);
4111 if (test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
))
4113 else if (mddev
->in_sync
)
4115 else if (mddev
->safemode
)
4119 spin_unlock(&mddev
->lock
);
4122 if (list_empty(&mddev
->disks
) &&
4123 mddev
->raid_disks
== 0 &&
4124 mddev
->dev_sectors
== 0)
4129 return sprintf(page
, "%s\n", array_states
[st
]);
4132 static int do_md_stop(struct mddev
*mddev
, int ro
, struct block_device
*bdev
);
4133 static int md_set_readonly(struct mddev
*mddev
, struct block_device
*bdev
);
4134 static int do_md_run(struct mddev
*mddev
);
4135 static int restart_array(struct mddev
*mddev
);
4138 array_state_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4141 enum array_state st
= match_word(buf
, array_states
);
4143 if (mddev
->pers
&& (st
== active
|| st
== clean
) && mddev
->ro
!= 1) {
4144 /* don't take reconfig_mutex when toggling between
4147 spin_lock(&mddev
->lock
);
4149 restart_array(mddev
);
4150 clear_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
4151 md_wakeup_thread(mddev
->thread
);
4152 wake_up(&mddev
->sb_wait
);
4153 } else /* st == clean */ {
4154 restart_array(mddev
);
4155 if (!set_in_sync(mddev
))
4159 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4160 spin_unlock(&mddev
->lock
);
4163 err
= mddev_lock(mddev
);
4171 /* stopping an active array */
4172 err
= do_md_stop(mddev
, 0, NULL
);
4175 /* stopping an active array */
4177 err
= do_md_stop(mddev
, 2, NULL
);
4179 err
= 0; /* already inactive */
4182 break; /* not supported yet */
4185 err
= md_set_readonly(mddev
, NULL
);
4188 set_disk_ro(mddev
->gendisk
, 1);
4189 err
= do_md_run(mddev
);
4195 err
= md_set_readonly(mddev
, NULL
);
4196 else if (mddev
->ro
== 1)
4197 err
= restart_array(mddev
);
4200 set_disk_ro(mddev
->gendisk
, 0);
4204 err
= do_md_run(mddev
);
4209 err
= restart_array(mddev
);
4212 spin_lock(&mddev
->lock
);
4213 if (!set_in_sync(mddev
))
4215 spin_unlock(&mddev
->lock
);
4221 err
= restart_array(mddev
);
4224 clear_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
4225 wake_up(&mddev
->sb_wait
);
4229 set_disk_ro(mddev
->gendisk
, 0);
4230 err
= do_md_run(mddev
);
4235 /* these cannot be set */
4240 if (mddev
->hold_active
== UNTIL_IOCTL
)
4241 mddev
->hold_active
= 0;
4242 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4244 mddev_unlock(mddev
);
4247 static struct md_sysfs_entry md_array_state
=
4248 __ATTR_PREALLOC(array_state
, S_IRUGO
|S_IWUSR
, array_state_show
, array_state_store
);
4251 max_corrected_read_errors_show(struct mddev
*mddev
, char *page
) {
4252 return sprintf(page
, "%d\n",
4253 atomic_read(&mddev
->max_corr_read_errors
));
4257 max_corrected_read_errors_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4262 rv
= kstrtouint(buf
, 10, &n
);
4265 atomic_set(&mddev
->max_corr_read_errors
, n
);
4269 static struct md_sysfs_entry max_corr_read_errors
=
4270 __ATTR(max_read_errors
, S_IRUGO
|S_IWUSR
, max_corrected_read_errors_show
,
4271 max_corrected_read_errors_store
);
4274 null_show(struct mddev
*mddev
, char *page
)
4280 new_dev_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4282 /* buf must be %d:%d\n? giving major and minor numbers */
4283 /* The new device is added to the array.
4284 * If the array has a persistent superblock, we read the
4285 * superblock to initialise info and check validity.
4286 * Otherwise, only checking done is that in bind_rdev_to_array,
4287 * which mainly checks size.
4290 int major
= simple_strtoul(buf
, &e
, 10);
4293 struct md_rdev
*rdev
;
4296 if (!*buf
|| *e
!= ':' || !e
[1] || e
[1] == '\n')
4298 minor
= simple_strtoul(e
+1, &e
, 10);
4299 if (*e
&& *e
!= '\n')
4301 dev
= MKDEV(major
, minor
);
4302 if (major
!= MAJOR(dev
) ||
4303 minor
!= MINOR(dev
))
4306 flush_workqueue(md_misc_wq
);
4308 err
= mddev_lock(mddev
);
4311 if (mddev
->persistent
) {
4312 rdev
= md_import_device(dev
, mddev
->major_version
,
4313 mddev
->minor_version
);
4314 if (!IS_ERR(rdev
) && !list_empty(&mddev
->disks
)) {
4315 struct md_rdev
*rdev0
4316 = list_entry(mddev
->disks
.next
,
4317 struct md_rdev
, same_set
);
4318 err
= super_types
[mddev
->major_version
]
4319 .load_super(rdev
, rdev0
, mddev
->minor_version
);
4323 } else if (mddev
->external
)
4324 rdev
= md_import_device(dev
, -2, -1);
4326 rdev
= md_import_device(dev
, -1, -1);
4329 mddev_unlock(mddev
);
4330 return PTR_ERR(rdev
);
4332 err
= bind_rdev_to_array(rdev
, mddev
);
4336 mddev_unlock(mddev
);
4338 md_new_event(mddev
);
4339 return err
? err
: len
;
4342 static struct md_sysfs_entry md_new_device
=
4343 __ATTR(new_dev
, S_IWUSR
, null_show
, new_dev_store
);
4346 bitmap_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4349 unsigned long chunk
, end_chunk
;
4352 err
= mddev_lock(mddev
);
4357 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
4359 chunk
= end_chunk
= simple_strtoul(buf
, &end
, 0);
4360 if (buf
== end
) break;
4361 if (*end
== '-') { /* range */
4363 end_chunk
= simple_strtoul(buf
, &end
, 0);
4364 if (buf
== end
) break;
4366 if (*end
&& !isspace(*end
)) break;
4367 md_bitmap_dirty_bits(mddev
->bitmap
, chunk
, end_chunk
);
4368 buf
= skip_spaces(end
);
4370 md_bitmap_unplug(mddev
->bitmap
); /* flush the bits to disk */
4372 mddev_unlock(mddev
);
4376 static struct md_sysfs_entry md_bitmap
=
4377 __ATTR(bitmap_set_bits
, S_IWUSR
, null_show
, bitmap_store
);
4380 size_show(struct mddev
*mddev
, char *page
)
4382 return sprintf(page
, "%llu\n",
4383 (unsigned long long)mddev
->dev_sectors
/ 2);
4386 static int update_size(struct mddev
*mddev
, sector_t num_sectors
);
4389 size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4391 /* If array is inactive, we can reduce the component size, but
4392 * not increase it (except from 0).
4393 * If array is active, we can try an on-line resize
4396 int err
= strict_blocks_to_sectors(buf
, §ors
);
4400 err
= mddev_lock(mddev
);
4404 err
= update_size(mddev
, sectors
);
4406 md_update_sb(mddev
, 1);
4408 if (mddev
->dev_sectors
== 0 ||
4409 mddev
->dev_sectors
> sectors
)
4410 mddev
->dev_sectors
= sectors
;
4414 mddev_unlock(mddev
);
4415 return err
? err
: len
;
4418 static struct md_sysfs_entry md_size
=
4419 __ATTR(component_size
, S_IRUGO
|S_IWUSR
, size_show
, size_store
);
4421 /* Metadata version.
4423 * 'none' for arrays with no metadata (good luck...)
4424 * 'external' for arrays with externally managed metadata,
4425 * or N.M for internally known formats
4428 metadata_show(struct mddev
*mddev
, char *page
)
4430 if (mddev
->persistent
)
4431 return sprintf(page
, "%d.%d\n",
4432 mddev
->major_version
, mddev
->minor_version
);
4433 else if (mddev
->external
)
4434 return sprintf(page
, "external:%s\n", mddev
->metadata_type
);
4436 return sprintf(page
, "none\n");
4440 metadata_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4445 /* Changing the details of 'external' metadata is
4446 * always permitted. Otherwise there must be
4447 * no devices attached to the array.
4450 err
= mddev_lock(mddev
);
4454 if (mddev
->external
&& strncmp(buf
, "external:", 9) == 0)
4456 else if (!list_empty(&mddev
->disks
))
4460 if (cmd_match(buf
, "none")) {
4461 mddev
->persistent
= 0;
4462 mddev
->external
= 0;
4463 mddev
->major_version
= 0;
4464 mddev
->minor_version
= 90;
4467 if (strncmp(buf
, "external:", 9) == 0) {
4468 size_t namelen
= len
-9;
4469 if (namelen
>= sizeof(mddev
->metadata_type
))
4470 namelen
= sizeof(mddev
->metadata_type
)-1;
4471 strncpy(mddev
->metadata_type
, buf
+9, namelen
);
4472 mddev
->metadata_type
[namelen
] = 0;
4473 if (namelen
&& mddev
->metadata_type
[namelen
-1] == '\n')
4474 mddev
->metadata_type
[--namelen
] = 0;
4475 mddev
->persistent
= 0;
4476 mddev
->external
= 1;
4477 mddev
->major_version
= 0;
4478 mddev
->minor_version
= 90;
4481 major
= simple_strtoul(buf
, &e
, 10);
4483 if (e
==buf
|| *e
!= '.')
4486 minor
= simple_strtoul(buf
, &e
, 10);
4487 if (e
==buf
|| (*e
&& *e
!= '\n') )
4490 if (major
>= ARRAY_SIZE(super_types
) || super_types
[major
].name
== NULL
)
4492 mddev
->major_version
= major
;
4493 mddev
->minor_version
= minor
;
4494 mddev
->persistent
= 1;
4495 mddev
->external
= 0;
4498 mddev_unlock(mddev
);
4502 static struct md_sysfs_entry md_metadata
=
4503 __ATTR_PREALLOC(metadata_version
, S_IRUGO
|S_IWUSR
, metadata_show
, metadata_store
);
4506 action_show(struct mddev
*mddev
, char *page
)
4508 char *type
= "idle";
4509 unsigned long recovery
= mddev
->recovery
;
4510 if (test_bit(MD_RECOVERY_FROZEN
, &recovery
))
4512 else if (test_bit(MD_RECOVERY_RUNNING
, &recovery
) ||
4513 (!mddev
->ro
&& test_bit(MD_RECOVERY_NEEDED
, &recovery
))) {
4514 if (test_bit(MD_RECOVERY_RESHAPE
, &recovery
))
4516 else if (test_bit(MD_RECOVERY_SYNC
, &recovery
)) {
4517 if (!test_bit(MD_RECOVERY_REQUESTED
, &recovery
))
4519 else if (test_bit(MD_RECOVERY_CHECK
, &recovery
))
4523 } else if (test_bit(MD_RECOVERY_RECOVER
, &recovery
))
4525 else if (mddev
->reshape_position
!= MaxSector
)
4528 return sprintf(page
, "%s\n", type
);
4532 action_store(struct mddev
*mddev
, const char *page
, size_t len
)
4534 if (!mddev
->pers
|| !mddev
->pers
->sync_request
)
4538 if (cmd_match(page
, "idle") || cmd_match(page
, "frozen")) {
4539 if (cmd_match(page
, "frozen"))
4540 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4542 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4543 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
4544 mddev_lock(mddev
) == 0) {
4545 flush_workqueue(md_misc_wq
);
4546 if (mddev
->sync_thread
) {
4547 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4548 md_reap_sync_thread(mddev
);
4550 mddev_unlock(mddev
);
4552 } else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4554 else if (cmd_match(page
, "resync"))
4555 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4556 else if (cmd_match(page
, "recover")) {
4557 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4558 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
4559 } else if (cmd_match(page
, "reshape")) {
4561 if (mddev
->pers
->start_reshape
== NULL
)
4563 err
= mddev_lock(mddev
);
4565 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4568 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4569 err
= mddev
->pers
->start_reshape(mddev
);
4571 mddev_unlock(mddev
);
4575 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
4577 if (cmd_match(page
, "check"))
4578 set_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
4579 else if (!cmd_match(page
, "repair"))
4581 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4582 set_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
4583 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
4585 if (mddev
->ro
== 2) {
4586 /* A write to sync_action is enough to justify
4587 * canceling read-auto mode
4590 md_wakeup_thread(mddev
->sync_thread
);
4592 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4593 md_wakeup_thread(mddev
->thread
);
4594 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
4598 static struct md_sysfs_entry md_scan_mode
=
4599 __ATTR_PREALLOC(sync_action
, S_IRUGO
|S_IWUSR
, action_show
, action_store
);
4602 last_sync_action_show(struct mddev
*mddev
, char *page
)
4604 return sprintf(page
, "%s\n", mddev
->last_sync_action
);
4607 static struct md_sysfs_entry md_last_scan_mode
= __ATTR_RO(last_sync_action
);
4610 mismatch_cnt_show(struct mddev
*mddev
, char *page
)
4612 return sprintf(page
, "%llu\n",
4613 (unsigned long long)
4614 atomic64_read(&mddev
->resync_mismatches
));
4617 static struct md_sysfs_entry md_mismatches
= __ATTR_RO(mismatch_cnt
);
4620 sync_min_show(struct mddev
*mddev
, char *page
)
4622 return sprintf(page
, "%d (%s)\n", speed_min(mddev
),
4623 mddev
->sync_speed_min
? "local": "system");
4627 sync_min_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4632 if (strncmp(buf
, "system", 6)==0) {
4635 rv
= kstrtouint(buf
, 10, &min
);
4641 mddev
->sync_speed_min
= min
;
4645 static struct md_sysfs_entry md_sync_min
=
4646 __ATTR(sync_speed_min
, S_IRUGO
|S_IWUSR
, sync_min_show
, sync_min_store
);
4649 sync_max_show(struct mddev
*mddev
, char *page
)
4651 return sprintf(page
, "%d (%s)\n", speed_max(mddev
),
4652 mddev
->sync_speed_max
? "local": "system");
4656 sync_max_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4661 if (strncmp(buf
, "system", 6)==0) {
4664 rv
= kstrtouint(buf
, 10, &max
);
4670 mddev
->sync_speed_max
= max
;
4674 static struct md_sysfs_entry md_sync_max
=
4675 __ATTR(sync_speed_max
, S_IRUGO
|S_IWUSR
, sync_max_show
, sync_max_store
);
4678 degraded_show(struct mddev
*mddev
, char *page
)
4680 return sprintf(page
, "%d\n", mddev
->degraded
);
4682 static struct md_sysfs_entry md_degraded
= __ATTR_RO(degraded
);
4685 sync_force_parallel_show(struct mddev
*mddev
, char *page
)
4687 return sprintf(page
, "%d\n", mddev
->parallel_resync
);
4691 sync_force_parallel_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4695 if (kstrtol(buf
, 10, &n
))
4698 if (n
!= 0 && n
!= 1)
4701 mddev
->parallel_resync
= n
;
4703 if (mddev
->sync_thread
)
4704 wake_up(&resync_wait
);
4709 /* force parallel resync, even with shared block devices */
4710 static struct md_sysfs_entry md_sync_force_parallel
=
4711 __ATTR(sync_force_parallel
, S_IRUGO
|S_IWUSR
,
4712 sync_force_parallel_show
, sync_force_parallel_store
);
4715 sync_speed_show(struct mddev
*mddev
, char *page
)
4717 unsigned long resync
, dt
, db
;
4718 if (mddev
->curr_resync
== 0)
4719 return sprintf(page
, "none\n");
4720 resync
= mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
);
4721 dt
= (jiffies
- mddev
->resync_mark
) / HZ
;
4723 db
= resync
- mddev
->resync_mark_cnt
;
4724 return sprintf(page
, "%lu\n", db
/dt
/2); /* K/sec */
4727 static struct md_sysfs_entry md_sync_speed
= __ATTR_RO(sync_speed
);
4730 sync_completed_show(struct mddev
*mddev
, char *page
)
4732 unsigned long long max_sectors
, resync
;
4734 if (!test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4735 return sprintf(page
, "none\n");
4737 if (mddev
->curr_resync
== 1 ||
4738 mddev
->curr_resync
== 2)
4739 return sprintf(page
, "delayed\n");
4741 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
4742 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
4743 max_sectors
= mddev
->resync_max_sectors
;
4745 max_sectors
= mddev
->dev_sectors
;
4747 resync
= mddev
->curr_resync_completed
;
4748 return sprintf(page
, "%llu / %llu\n", resync
, max_sectors
);
4751 static struct md_sysfs_entry md_sync_completed
=
4752 __ATTR_PREALLOC(sync_completed
, S_IRUGO
, sync_completed_show
, NULL
);
4755 min_sync_show(struct mddev
*mddev
, char *page
)
4757 return sprintf(page
, "%llu\n",
4758 (unsigned long long)mddev
->resync_min
);
4761 min_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4763 unsigned long long min
;
4766 if (kstrtoull(buf
, 10, &min
))
4769 spin_lock(&mddev
->lock
);
4771 if (min
> mddev
->resync_max
)
4775 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4778 /* Round down to multiple of 4K for safety */
4779 mddev
->resync_min
= round_down(min
, 8);
4783 spin_unlock(&mddev
->lock
);
4787 static struct md_sysfs_entry md_min_sync
=
4788 __ATTR(sync_min
, S_IRUGO
|S_IWUSR
, min_sync_show
, min_sync_store
);
4791 max_sync_show(struct mddev
*mddev
, char *page
)
4793 if (mddev
->resync_max
== MaxSector
)
4794 return sprintf(page
, "max\n");
4796 return sprintf(page
, "%llu\n",
4797 (unsigned long long)mddev
->resync_max
);
4800 max_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4803 spin_lock(&mddev
->lock
);
4804 if (strncmp(buf
, "max", 3) == 0)
4805 mddev
->resync_max
= MaxSector
;
4807 unsigned long long max
;
4811 if (kstrtoull(buf
, 10, &max
))
4813 if (max
< mddev
->resync_min
)
4817 if (max
< mddev
->resync_max
&&
4819 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4822 /* Must be a multiple of chunk_size */
4823 chunk
= mddev
->chunk_sectors
;
4825 sector_t temp
= max
;
4828 if (sector_div(temp
, chunk
))
4831 mddev
->resync_max
= max
;
4833 wake_up(&mddev
->recovery_wait
);
4836 spin_unlock(&mddev
->lock
);
4840 static struct md_sysfs_entry md_max_sync
=
4841 __ATTR(sync_max
, S_IRUGO
|S_IWUSR
, max_sync_show
, max_sync_store
);
4844 suspend_lo_show(struct mddev
*mddev
, char *page
)
4846 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_lo
);
4850 suspend_lo_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4852 unsigned long long new;
4855 err
= kstrtoull(buf
, 10, &new);
4858 if (new != (sector_t
)new)
4861 err
= mddev_lock(mddev
);
4865 if (mddev
->pers
== NULL
||
4866 mddev
->pers
->quiesce
== NULL
)
4868 mddev_suspend(mddev
);
4869 mddev
->suspend_lo
= new;
4870 mddev_resume(mddev
);
4874 mddev_unlock(mddev
);
4877 static struct md_sysfs_entry md_suspend_lo
=
4878 __ATTR(suspend_lo
, S_IRUGO
|S_IWUSR
, suspend_lo_show
, suspend_lo_store
);
4881 suspend_hi_show(struct mddev
*mddev
, char *page
)
4883 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_hi
);
4887 suspend_hi_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4889 unsigned long long new;
4892 err
= kstrtoull(buf
, 10, &new);
4895 if (new != (sector_t
)new)
4898 err
= mddev_lock(mddev
);
4902 if (mddev
->pers
== NULL
)
4905 mddev_suspend(mddev
);
4906 mddev
->suspend_hi
= new;
4907 mddev_resume(mddev
);
4911 mddev_unlock(mddev
);
4914 static struct md_sysfs_entry md_suspend_hi
=
4915 __ATTR(suspend_hi
, S_IRUGO
|S_IWUSR
, suspend_hi_show
, suspend_hi_store
);
4918 reshape_position_show(struct mddev
*mddev
, char *page
)
4920 if (mddev
->reshape_position
!= MaxSector
)
4921 return sprintf(page
, "%llu\n",
4922 (unsigned long long)mddev
->reshape_position
);
4923 strcpy(page
, "none\n");
4928 reshape_position_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4930 struct md_rdev
*rdev
;
4931 unsigned long long new;
4934 err
= kstrtoull(buf
, 10, &new);
4937 if (new != (sector_t
)new)
4939 err
= mddev_lock(mddev
);
4945 mddev
->reshape_position
= new;
4946 mddev
->delta_disks
= 0;
4947 mddev
->reshape_backwards
= 0;
4948 mddev
->new_level
= mddev
->level
;
4949 mddev
->new_layout
= mddev
->layout
;
4950 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
4951 rdev_for_each(rdev
, mddev
)
4952 rdev
->new_data_offset
= rdev
->data_offset
;
4955 mddev_unlock(mddev
);
4959 static struct md_sysfs_entry md_reshape_position
=
4960 __ATTR(reshape_position
, S_IRUGO
|S_IWUSR
, reshape_position_show
,
4961 reshape_position_store
);
4964 reshape_direction_show(struct mddev
*mddev
, char *page
)
4966 return sprintf(page
, "%s\n",
4967 mddev
->reshape_backwards
? "backwards" : "forwards");
4971 reshape_direction_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4976 if (cmd_match(buf
, "forwards"))
4978 else if (cmd_match(buf
, "backwards"))
4982 if (mddev
->reshape_backwards
== backwards
)
4985 err
= mddev_lock(mddev
);
4988 /* check if we are allowed to change */
4989 if (mddev
->delta_disks
)
4991 else if (mddev
->persistent
&&
4992 mddev
->major_version
== 0)
4995 mddev
->reshape_backwards
= backwards
;
4996 mddev_unlock(mddev
);
5000 static struct md_sysfs_entry md_reshape_direction
=
5001 __ATTR(reshape_direction
, S_IRUGO
|S_IWUSR
, reshape_direction_show
,
5002 reshape_direction_store
);
5005 array_size_show(struct mddev
*mddev
, char *page
)
5007 if (mddev
->external_size
)
5008 return sprintf(page
, "%llu\n",
5009 (unsigned long long)mddev
->array_sectors
/2);
5011 return sprintf(page
, "default\n");
5015 array_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
5020 err
= mddev_lock(mddev
);
5024 /* cluster raid doesn't support change array_sectors */
5025 if (mddev_is_clustered(mddev
)) {
5026 mddev_unlock(mddev
);
5030 if (strncmp(buf
, "default", 7) == 0) {
5032 sectors
= mddev
->pers
->size(mddev
, 0, 0);
5034 sectors
= mddev
->array_sectors
;
5036 mddev
->external_size
= 0;
5038 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
5040 else if (mddev
->pers
&& mddev
->pers
->size(mddev
, 0, 0) < sectors
)
5043 mddev
->external_size
= 1;
5047 mddev
->array_sectors
= sectors
;
5049 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
5050 revalidate_disk(mddev
->gendisk
);
5053 mddev_unlock(mddev
);
5057 static struct md_sysfs_entry md_array_size
=
5058 __ATTR(array_size
, S_IRUGO
|S_IWUSR
, array_size_show
,
5062 consistency_policy_show(struct mddev
*mddev
, char *page
)
5066 if (test_bit(MD_HAS_JOURNAL
, &mddev
->flags
)) {
5067 ret
= sprintf(page
, "journal\n");
5068 } else if (test_bit(MD_HAS_PPL
, &mddev
->flags
)) {
5069 ret
= sprintf(page
, "ppl\n");
5070 } else if (mddev
->bitmap
) {
5071 ret
= sprintf(page
, "bitmap\n");
5072 } else if (mddev
->pers
) {
5073 if (mddev
->pers
->sync_request
)
5074 ret
= sprintf(page
, "resync\n");
5076 ret
= sprintf(page
, "none\n");
5078 ret
= sprintf(page
, "unknown\n");
5085 consistency_policy_store(struct mddev
*mddev
, const char *buf
, size_t len
)
5090 if (mddev
->pers
->change_consistency_policy
)
5091 err
= mddev
->pers
->change_consistency_policy(mddev
, buf
);
5094 } else if (mddev
->external
&& strncmp(buf
, "ppl", 3) == 0) {
5095 set_bit(MD_HAS_PPL
, &mddev
->flags
);
5100 return err
? err
: len
;
5103 static struct md_sysfs_entry md_consistency_policy
=
5104 __ATTR(consistency_policy
, S_IRUGO
| S_IWUSR
, consistency_policy_show
,
5105 consistency_policy_store
);
5107 static struct attribute
*md_default_attrs
[] = {
5110 &md_raid_disks
.attr
,
5111 &md_chunk_size
.attr
,
5113 &md_resync_start
.attr
,
5115 &md_new_device
.attr
,
5116 &md_safe_delay
.attr
,
5117 &md_array_state
.attr
,
5118 &md_reshape_position
.attr
,
5119 &md_reshape_direction
.attr
,
5120 &md_array_size
.attr
,
5121 &max_corr_read_errors
.attr
,
5122 &md_consistency_policy
.attr
,
5126 static struct attribute
*md_redundancy_attrs
[] = {
5128 &md_last_scan_mode
.attr
,
5129 &md_mismatches
.attr
,
5132 &md_sync_speed
.attr
,
5133 &md_sync_force_parallel
.attr
,
5134 &md_sync_completed
.attr
,
5137 &md_suspend_lo
.attr
,
5138 &md_suspend_hi
.attr
,
5143 static struct attribute_group md_redundancy_group
= {
5145 .attrs
= md_redundancy_attrs
,
5149 md_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
5151 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
5152 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
5157 spin_lock(&all_mddevs_lock
);
5158 if (list_empty(&mddev
->all_mddevs
)) {
5159 spin_unlock(&all_mddevs_lock
);
5163 spin_unlock(&all_mddevs_lock
);
5165 rv
= entry
->show(mddev
, page
);
5171 md_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
5172 const char *page
, size_t length
)
5174 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
5175 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
5180 if (!capable(CAP_SYS_ADMIN
))
5182 spin_lock(&all_mddevs_lock
);
5183 if (list_empty(&mddev
->all_mddevs
)) {
5184 spin_unlock(&all_mddevs_lock
);
5188 spin_unlock(&all_mddevs_lock
);
5189 rv
= entry
->store(mddev
, page
, length
);
5194 static void md_free(struct kobject
*ko
)
5196 struct mddev
*mddev
= container_of(ko
, struct mddev
, kobj
);
5198 if (mddev
->sysfs_state
)
5199 sysfs_put(mddev
->sysfs_state
);
5202 del_gendisk(mddev
->gendisk
);
5204 blk_cleanup_queue(mddev
->queue
);
5206 put_disk(mddev
->gendisk
);
5207 percpu_ref_exit(&mddev
->writes_pending
);
5209 bioset_exit(&mddev
->bio_set
);
5210 bioset_exit(&mddev
->sync_set
);
5214 static const struct sysfs_ops md_sysfs_ops
= {
5215 .show
= md_attr_show
,
5216 .store
= md_attr_store
,
5218 static struct kobj_type md_ktype
= {
5220 .sysfs_ops
= &md_sysfs_ops
,
5221 .default_attrs
= md_default_attrs
,
5226 static void mddev_delayed_delete(struct work_struct
*ws
)
5228 struct mddev
*mddev
= container_of(ws
, struct mddev
, del_work
);
5230 sysfs_remove_group(&mddev
->kobj
, &md_bitmap_group
);
5231 kobject_del(&mddev
->kobj
);
5232 kobject_put(&mddev
->kobj
);
5235 static void no_op(struct percpu_ref
*r
) {}
5237 int mddev_init_writes_pending(struct mddev
*mddev
)
5239 if (mddev
->writes_pending
.percpu_count_ptr
)
5241 if (percpu_ref_init(&mddev
->writes_pending
, no_op
, 0, GFP_KERNEL
) < 0)
5243 /* We want to start with the refcount at zero */
5244 percpu_ref_put(&mddev
->writes_pending
);
5247 EXPORT_SYMBOL_GPL(mddev_init_writes_pending
);
5249 static int md_alloc(dev_t dev
, char *name
)
5252 * If dev is zero, name is the name of a device to allocate with
5253 * an arbitrary minor number. It will be "md_???"
5254 * If dev is non-zero it must be a device number with a MAJOR of
5255 * MD_MAJOR or mdp_major. In this case, if "name" is NULL, then
5256 * the device is being created by opening a node in /dev.
5257 * If "name" is not NULL, the device is being created by
5258 * writing to /sys/module/md_mod/parameters/new_array.
5260 static DEFINE_MUTEX(disks_mutex
);
5261 struct mddev
*mddev
= mddev_find(dev
);
5262 struct gendisk
*disk
;
5271 partitioned
= (MAJOR(mddev
->unit
) != MD_MAJOR
);
5272 shift
= partitioned
? MdpMinorShift
: 0;
5273 unit
= MINOR(mddev
->unit
) >> shift
;
5275 /* wait for any previous instance of this device to be
5276 * completely removed (mddev_delayed_delete).
5278 flush_workqueue(md_misc_wq
);
5280 mutex_lock(&disks_mutex
);
5286 /* Need to ensure that 'name' is not a duplicate.
5288 struct mddev
*mddev2
;
5289 spin_lock(&all_mddevs_lock
);
5291 list_for_each_entry(mddev2
, &all_mddevs
, all_mddevs
)
5292 if (mddev2
->gendisk
&&
5293 strcmp(mddev2
->gendisk
->disk_name
, name
) == 0) {
5294 spin_unlock(&all_mddevs_lock
);
5297 spin_unlock(&all_mddevs_lock
);
5301 * Creating /dev/mdNNN via "newarray", so adjust hold_active.
5303 mddev
->hold_active
= UNTIL_STOP
;
5306 mddev
->queue
= blk_alloc_queue(GFP_KERNEL
);
5309 mddev
->queue
->queuedata
= mddev
;
5311 blk_queue_make_request(mddev
->queue
, md_make_request
);
5312 blk_set_stacking_limits(&mddev
->queue
->limits
);
5314 disk
= alloc_disk(1 << shift
);
5316 blk_cleanup_queue(mddev
->queue
);
5317 mddev
->queue
= NULL
;
5320 disk
->major
= MAJOR(mddev
->unit
);
5321 disk
->first_minor
= unit
<< shift
;
5323 strcpy(disk
->disk_name
, name
);
5324 else if (partitioned
)
5325 sprintf(disk
->disk_name
, "md_d%d", unit
);
5327 sprintf(disk
->disk_name
, "md%d", unit
);
5328 disk
->fops
= &md_fops
;
5329 disk
->private_data
= mddev
;
5330 disk
->queue
= mddev
->queue
;
5331 blk_queue_write_cache(mddev
->queue
, true, true);
5332 /* Allow extended partitions. This makes the
5333 * 'mdp' device redundant, but we can't really
5336 disk
->flags
|= GENHD_FL_EXT_DEVT
;
5337 mddev
->gendisk
= disk
;
5338 /* As soon as we call add_disk(), another thread could get
5339 * through to md_open, so make sure it doesn't get too far
5341 mutex_lock(&mddev
->open_mutex
);
5344 error
= kobject_add(&mddev
->kobj
, &disk_to_dev(disk
)->kobj
, "%s", "md");
5346 /* This isn't possible, but as kobject_init_and_add is marked
5347 * __must_check, we must do something with the result
5349 pr_debug("md: cannot register %s/md - name in use\n",
5353 if (mddev
->kobj
.sd
&&
5354 sysfs_create_group(&mddev
->kobj
, &md_bitmap_group
))
5355 pr_debug("pointless warning\n");
5356 mutex_unlock(&mddev
->open_mutex
);
5358 mutex_unlock(&disks_mutex
);
5359 if (!error
&& mddev
->kobj
.sd
) {
5360 kobject_uevent(&mddev
->kobj
, KOBJ_ADD
);
5361 mddev
->sysfs_state
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "array_state");
5367 static struct kobject
*md_probe(dev_t dev
, int *part
, void *data
)
5370 md_alloc(dev
, NULL
);
5374 static int add_named_array(const char *val
, const struct kernel_param
*kp
)
5377 * val must be "md_*" or "mdNNN".
5378 * For "md_*" we allocate an array with a large free minor number, and
5379 * set the name to val. val must not already be an active name.
5380 * For "mdNNN" we allocate an array with the minor number NNN
5381 * which must not already be in use.
5383 int len
= strlen(val
);
5384 char buf
[DISK_NAME_LEN
];
5385 unsigned long devnum
;
5387 while (len
&& val
[len
-1] == '\n')
5389 if (len
>= DISK_NAME_LEN
)
5391 strlcpy(buf
, val
, len
+1);
5392 if (strncmp(buf
, "md_", 3) == 0)
5393 return md_alloc(0, buf
);
5394 if (strncmp(buf
, "md", 2) == 0 &&
5396 kstrtoul(buf
+2, 10, &devnum
) == 0 &&
5397 devnum
<= MINORMASK
)
5398 return md_alloc(MKDEV(MD_MAJOR
, devnum
), NULL
);
5403 static void md_safemode_timeout(struct timer_list
*t
)
5405 struct mddev
*mddev
= from_timer(mddev
, t
, safemode_timer
);
5407 mddev
->safemode
= 1;
5408 if (mddev
->external
)
5409 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5411 md_wakeup_thread(mddev
->thread
);
5414 static int start_dirty_degraded
;
5416 int md_run(struct mddev
*mddev
)
5419 struct md_rdev
*rdev
;
5420 struct md_personality
*pers
;
5422 if (list_empty(&mddev
->disks
))
5423 /* cannot run an array with no devices.. */
5428 /* Cannot run until previous stop completes properly */
5429 if (mddev
->sysfs_active
)
5433 * Analyze all RAID superblock(s)
5435 if (!mddev
->raid_disks
) {
5436 if (!mddev
->persistent
)
5441 if (mddev
->level
!= LEVEL_NONE
)
5442 request_module("md-level-%d", mddev
->level
);
5443 else if (mddev
->clevel
[0])
5444 request_module("md-%s", mddev
->clevel
);
5447 * Drop all container device buffers, from now on
5448 * the only valid external interface is through the md
5451 mddev
->has_superblocks
= false;
5452 rdev_for_each(rdev
, mddev
) {
5453 if (test_bit(Faulty
, &rdev
->flags
))
5455 sync_blockdev(rdev
->bdev
);
5456 invalidate_bdev(rdev
->bdev
);
5457 if (mddev
->ro
!= 1 &&
5458 (bdev_read_only(rdev
->bdev
) ||
5459 bdev_read_only(rdev
->meta_bdev
))) {
5462 set_disk_ro(mddev
->gendisk
, 1);
5466 mddev
->has_superblocks
= true;
5468 /* perform some consistency tests on the device.
5469 * We don't want the data to overlap the metadata,
5470 * Internal Bitmap issues have been handled elsewhere.
5472 if (rdev
->meta_bdev
) {
5473 /* Nothing to check */;
5474 } else if (rdev
->data_offset
< rdev
->sb_start
) {
5475 if (mddev
->dev_sectors
&&
5476 rdev
->data_offset
+ mddev
->dev_sectors
5478 pr_warn("md: %s: data overlaps metadata\n",
5483 if (rdev
->sb_start
+ rdev
->sb_size
/512
5484 > rdev
->data_offset
) {
5485 pr_warn("md: %s: metadata overlaps data\n",
5490 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
5493 if (!bioset_initialized(&mddev
->bio_set
)) {
5494 err
= bioset_init(&mddev
->bio_set
, BIO_POOL_SIZE
, 0, BIOSET_NEED_BVECS
);
5498 if (!bioset_initialized(&mddev
->sync_set
)) {
5499 err
= bioset_init(&mddev
->sync_set
, BIO_POOL_SIZE
, 0, BIOSET_NEED_BVECS
);
5504 spin_lock(&pers_lock
);
5505 pers
= find_pers(mddev
->level
, mddev
->clevel
);
5506 if (!pers
|| !try_module_get(pers
->owner
)) {
5507 spin_unlock(&pers_lock
);
5508 if (mddev
->level
!= LEVEL_NONE
)
5509 pr_warn("md: personality for level %d is not loaded!\n",
5512 pr_warn("md: personality for level %s is not loaded!\n",
5517 spin_unlock(&pers_lock
);
5518 if (mddev
->level
!= pers
->level
) {
5519 mddev
->level
= pers
->level
;
5520 mddev
->new_level
= pers
->level
;
5522 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
5524 if (mddev
->reshape_position
!= MaxSector
&&
5525 pers
->start_reshape
== NULL
) {
5526 /* This personality cannot handle reshaping... */
5527 module_put(pers
->owner
);
5532 if (pers
->sync_request
) {
5533 /* Warn if this is a potentially silly
5536 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
5537 struct md_rdev
*rdev2
;
5540 rdev_for_each(rdev
, mddev
)
5541 rdev_for_each(rdev2
, mddev
) {
5543 rdev
->bdev
->bd_contains
==
5544 rdev2
->bdev
->bd_contains
) {
5545 pr_warn("%s: WARNING: %s appears to be on the same physical disk as %s.\n",
5547 bdevname(rdev
->bdev
,b
),
5548 bdevname(rdev2
->bdev
,b2
));
5554 pr_warn("True protection against single-disk failure might be compromised.\n");
5557 mddev
->recovery
= 0;
5558 /* may be over-ridden by personality */
5559 mddev
->resync_max_sectors
= mddev
->dev_sectors
;
5561 mddev
->ok_start_degraded
= start_dirty_degraded
;
5563 if (start_readonly
&& mddev
->ro
== 0)
5564 mddev
->ro
= 2; /* read-only, but switch on first write */
5566 err
= pers
->run(mddev
);
5568 pr_warn("md: pers->run() failed ...\n");
5569 else if (pers
->size(mddev
, 0, 0) < mddev
->array_sectors
) {
5570 WARN_ONCE(!mddev
->external_size
,
5571 "%s: default size too small, but 'external_size' not in effect?\n",
5573 pr_warn("md: invalid array_size %llu > default size %llu\n",
5574 (unsigned long long)mddev
->array_sectors
/ 2,
5575 (unsigned long long)pers
->size(mddev
, 0, 0) / 2);
5578 if (err
== 0 && pers
->sync_request
&&
5579 (mddev
->bitmap_info
.file
|| mddev
->bitmap_info
.offset
)) {
5580 struct bitmap
*bitmap
;
5582 bitmap
= md_bitmap_create(mddev
, -1);
5583 if (IS_ERR(bitmap
)) {
5584 err
= PTR_ERR(bitmap
);
5585 pr_warn("%s: failed to create bitmap (%d)\n",
5586 mdname(mddev
), err
);
5588 mddev
->bitmap
= bitmap
;
5592 mddev_detach(mddev
);
5594 pers
->free(mddev
, mddev
->private);
5595 mddev
->private = NULL
;
5596 module_put(pers
->owner
);
5597 md_bitmap_destroy(mddev
);
5603 rdev_for_each(rdev
, mddev
) {
5604 if (rdev
->raid_disk
>= 0 &&
5605 !blk_queue_nonrot(bdev_get_queue(rdev
->bdev
))) {
5610 if (mddev
->degraded
)
5613 blk_queue_flag_set(QUEUE_FLAG_NONROT
, mddev
->queue
);
5615 blk_queue_flag_clear(QUEUE_FLAG_NONROT
, mddev
->queue
);
5616 mddev
->queue
->backing_dev_info
->congested_data
= mddev
;
5617 mddev
->queue
->backing_dev_info
->congested_fn
= md_congested
;
5619 if (pers
->sync_request
) {
5620 if (mddev
->kobj
.sd
&&
5621 sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
5622 pr_warn("md: cannot register extra attributes for %s\n",
5624 mddev
->sysfs_action
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "sync_action");
5625 } else if (mddev
->ro
== 2) /* auto-readonly not meaningful */
5628 atomic_set(&mddev
->max_corr_read_errors
,
5629 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS
);
5630 mddev
->safemode
= 0;
5631 if (mddev_is_clustered(mddev
))
5632 mddev
->safemode_delay
= 0;
5634 mddev
->safemode_delay
= (200 * HZ
)/1000 +1; /* 200 msec delay */
5637 spin_lock(&mddev
->lock
);
5639 spin_unlock(&mddev
->lock
);
5640 rdev_for_each(rdev
, mddev
)
5641 if (rdev
->raid_disk
>= 0)
5642 if (sysfs_link_rdev(mddev
, rdev
))
5643 /* failure here is OK */;
5645 if (mddev
->degraded
&& !mddev
->ro
)
5646 /* This ensures that recovering status is reported immediately
5647 * via sysfs - until a lack of spares is confirmed.
5649 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
5650 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5652 if (mddev
->sb_flags
)
5653 md_update_sb(mddev
, 0);
5655 md_new_event(mddev
);
5656 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5657 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
5658 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
5662 bioset_exit(&mddev
->bio_set
);
5663 bioset_exit(&mddev
->sync_set
);
5666 EXPORT_SYMBOL_GPL(md_run
);
5668 static int do_md_run(struct mddev
*mddev
)
5672 err
= md_run(mddev
);
5675 err
= md_bitmap_load(mddev
);
5677 md_bitmap_destroy(mddev
);
5681 if (mddev_is_clustered(mddev
))
5682 md_allow_write(mddev
);
5684 /* run start up tasks that require md_thread */
5687 md_wakeup_thread(mddev
->thread
);
5688 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
5690 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
5691 revalidate_disk(mddev
->gendisk
);
5693 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
5698 int md_start(struct mddev
*mddev
)
5702 if (mddev
->pers
->start
) {
5703 set_bit(MD_RECOVERY_WAIT
, &mddev
->recovery
);
5704 md_wakeup_thread(mddev
->thread
);
5705 ret
= mddev
->pers
->start(mddev
);
5706 clear_bit(MD_RECOVERY_WAIT
, &mddev
->recovery
);
5707 md_wakeup_thread(mddev
->sync_thread
);
5711 EXPORT_SYMBOL_GPL(md_start
);
5713 static int restart_array(struct mddev
*mddev
)
5715 struct gendisk
*disk
= mddev
->gendisk
;
5716 struct md_rdev
*rdev
;
5717 bool has_journal
= false;
5718 bool has_readonly
= false;
5720 /* Complain if it has no devices */
5721 if (list_empty(&mddev
->disks
))
5729 rdev_for_each_rcu(rdev
, mddev
) {
5730 if (test_bit(Journal
, &rdev
->flags
) &&
5731 !test_bit(Faulty
, &rdev
->flags
))
5733 if (bdev_read_only(rdev
->bdev
))
5734 has_readonly
= true;
5737 if (test_bit(MD_HAS_JOURNAL
, &mddev
->flags
) && !has_journal
)
5738 /* Don't restart rw with journal missing/faulty */
5743 mddev
->safemode
= 0;
5745 set_disk_ro(disk
, 0);
5746 pr_debug("md: %s switched to read-write mode.\n", mdname(mddev
));
5747 /* Kick recovery or resync if necessary */
5748 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5749 md_wakeup_thread(mddev
->thread
);
5750 md_wakeup_thread(mddev
->sync_thread
);
5751 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5755 static void md_clean(struct mddev
*mddev
)
5757 mddev
->array_sectors
= 0;
5758 mddev
->external_size
= 0;
5759 mddev
->dev_sectors
= 0;
5760 mddev
->raid_disks
= 0;
5761 mddev
->recovery_cp
= 0;
5762 mddev
->resync_min
= 0;
5763 mddev
->resync_max
= MaxSector
;
5764 mddev
->reshape_position
= MaxSector
;
5765 mddev
->external
= 0;
5766 mddev
->persistent
= 0;
5767 mddev
->level
= LEVEL_NONE
;
5768 mddev
->clevel
[0] = 0;
5770 mddev
->sb_flags
= 0;
5772 mddev
->metadata_type
[0] = 0;
5773 mddev
->chunk_sectors
= 0;
5774 mddev
->ctime
= mddev
->utime
= 0;
5776 mddev
->max_disks
= 0;
5778 mddev
->can_decrease_events
= 0;
5779 mddev
->delta_disks
= 0;
5780 mddev
->reshape_backwards
= 0;
5781 mddev
->new_level
= LEVEL_NONE
;
5782 mddev
->new_layout
= 0;
5783 mddev
->new_chunk_sectors
= 0;
5784 mddev
->curr_resync
= 0;
5785 atomic64_set(&mddev
->resync_mismatches
, 0);
5786 mddev
->suspend_lo
= mddev
->suspend_hi
= 0;
5787 mddev
->sync_speed_min
= mddev
->sync_speed_max
= 0;
5788 mddev
->recovery
= 0;
5791 mddev
->degraded
= 0;
5792 mddev
->safemode
= 0;
5793 mddev
->private = NULL
;
5794 mddev
->cluster_info
= NULL
;
5795 mddev
->bitmap_info
.offset
= 0;
5796 mddev
->bitmap_info
.default_offset
= 0;
5797 mddev
->bitmap_info
.default_space
= 0;
5798 mddev
->bitmap_info
.chunksize
= 0;
5799 mddev
->bitmap_info
.daemon_sleep
= 0;
5800 mddev
->bitmap_info
.max_write_behind
= 0;
5801 mddev
->bitmap_info
.nodes
= 0;
5804 static void __md_stop_writes(struct mddev
*mddev
)
5806 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5807 flush_workqueue(md_misc_wq
);
5808 if (mddev
->sync_thread
) {
5809 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5810 md_reap_sync_thread(mddev
);
5813 del_timer_sync(&mddev
->safemode_timer
);
5815 if (mddev
->pers
&& mddev
->pers
->quiesce
) {
5816 mddev
->pers
->quiesce(mddev
, 1);
5817 mddev
->pers
->quiesce(mddev
, 0);
5819 md_bitmap_flush(mddev
);
5821 if (mddev
->ro
== 0 &&
5822 ((!mddev
->in_sync
&& !mddev_is_clustered(mddev
)) ||
5824 /* mark array as shutdown cleanly */
5825 if (!mddev_is_clustered(mddev
))
5827 md_update_sb(mddev
, 1);
5831 void md_stop_writes(struct mddev
*mddev
)
5833 mddev_lock_nointr(mddev
);
5834 __md_stop_writes(mddev
);
5835 mddev_unlock(mddev
);
5837 EXPORT_SYMBOL_GPL(md_stop_writes
);
5839 static void mddev_detach(struct mddev
*mddev
)
5841 md_bitmap_wait_behind_writes(mddev
);
5842 if (mddev
->pers
&& mddev
->pers
->quiesce
) {
5843 mddev
->pers
->quiesce(mddev
, 1);
5844 mddev
->pers
->quiesce(mddev
, 0);
5846 md_unregister_thread(&mddev
->thread
);
5848 blk_sync_queue(mddev
->queue
); /* the unplug fn references 'conf'*/
5851 static void __md_stop(struct mddev
*mddev
)
5853 struct md_personality
*pers
= mddev
->pers
;
5854 md_bitmap_destroy(mddev
);
5855 mddev_detach(mddev
);
5856 /* Ensure ->event_work is done */
5857 flush_workqueue(md_misc_wq
);
5858 spin_lock(&mddev
->lock
);
5860 spin_unlock(&mddev
->lock
);
5861 pers
->free(mddev
, mddev
->private);
5862 mddev
->private = NULL
;
5863 if (pers
->sync_request
&& mddev
->to_remove
== NULL
)
5864 mddev
->to_remove
= &md_redundancy_group
;
5865 module_put(pers
->owner
);
5866 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5869 void md_stop(struct mddev
*mddev
)
5871 /* stop the array and free an attached data structures.
5872 * This is called from dm-raid
5875 bioset_exit(&mddev
->bio_set
);
5876 bioset_exit(&mddev
->sync_set
);
5879 EXPORT_SYMBOL_GPL(md_stop
);
5881 static int md_set_readonly(struct mddev
*mddev
, struct block_device
*bdev
)
5886 if (!test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
)) {
5888 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5889 md_wakeup_thread(mddev
->thread
);
5891 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
5892 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5893 if (mddev
->sync_thread
)
5894 /* Thread might be blocked waiting for metadata update
5895 * which will now never happen */
5896 wake_up_process(mddev
->sync_thread
->tsk
);
5898 if (mddev
->external
&& test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
))
5900 mddev_unlock(mddev
);
5901 wait_event(resync_wait
, !test_bit(MD_RECOVERY_RUNNING
,
5903 wait_event(mddev
->sb_wait
,
5904 !test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
));
5905 mddev_lock_nointr(mddev
);
5907 mutex_lock(&mddev
->open_mutex
);
5908 if ((mddev
->pers
&& atomic_read(&mddev
->openers
) > !!bdev
) ||
5909 mddev
->sync_thread
||
5910 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
)) {
5911 pr_warn("md: %s still in use.\n",mdname(mddev
));
5913 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5914 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5915 md_wakeup_thread(mddev
->thread
);
5921 __md_stop_writes(mddev
);
5927 set_disk_ro(mddev
->gendisk
, 1);
5928 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5929 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5930 md_wakeup_thread(mddev
->thread
);
5931 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5935 mutex_unlock(&mddev
->open_mutex
);
5940 * 0 - completely stop and dis-assemble array
5941 * 2 - stop but do not disassemble array
5943 static int do_md_stop(struct mddev
*mddev
, int mode
,
5944 struct block_device
*bdev
)
5946 struct gendisk
*disk
= mddev
->gendisk
;
5947 struct md_rdev
*rdev
;
5950 if (!test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
)) {
5952 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5953 md_wakeup_thread(mddev
->thread
);
5955 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
5956 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5957 if (mddev
->sync_thread
)
5958 /* Thread might be blocked waiting for metadata update
5959 * which will now never happen */
5960 wake_up_process(mddev
->sync_thread
->tsk
);
5962 mddev_unlock(mddev
);
5963 wait_event(resync_wait
, (mddev
->sync_thread
== NULL
&&
5964 !test_bit(MD_RECOVERY_RUNNING
,
5965 &mddev
->recovery
)));
5966 mddev_lock_nointr(mddev
);
5968 mutex_lock(&mddev
->open_mutex
);
5969 if ((mddev
->pers
&& atomic_read(&mddev
->openers
) > !!bdev
) ||
5970 mddev
->sysfs_active
||
5971 mddev
->sync_thread
||
5972 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
)) {
5973 pr_warn("md: %s still in use.\n",mdname(mddev
));
5974 mutex_unlock(&mddev
->open_mutex
);
5976 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5977 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5978 md_wakeup_thread(mddev
->thread
);
5984 set_disk_ro(disk
, 0);
5986 __md_stop_writes(mddev
);
5988 mddev
->queue
->backing_dev_info
->congested_fn
= NULL
;
5990 /* tell userspace to handle 'inactive' */
5991 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5993 rdev_for_each(rdev
, mddev
)
5994 if (rdev
->raid_disk
>= 0)
5995 sysfs_unlink_rdev(mddev
, rdev
);
5997 set_capacity(disk
, 0);
5998 mutex_unlock(&mddev
->open_mutex
);
6000 revalidate_disk(disk
);
6005 mutex_unlock(&mddev
->open_mutex
);
6007 * Free resources if final stop
6010 pr_info("md: %s stopped.\n", mdname(mddev
));
6012 if (mddev
->bitmap_info
.file
) {
6013 struct file
*f
= mddev
->bitmap_info
.file
;
6014 spin_lock(&mddev
->lock
);
6015 mddev
->bitmap_info
.file
= NULL
;
6016 spin_unlock(&mddev
->lock
);
6019 mddev
->bitmap_info
.offset
= 0;
6021 export_array(mddev
);
6024 if (mddev
->hold_active
== UNTIL_STOP
)
6025 mddev
->hold_active
= 0;
6027 md_new_event(mddev
);
6028 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6033 static void autorun_array(struct mddev
*mddev
)
6035 struct md_rdev
*rdev
;
6038 if (list_empty(&mddev
->disks
))
6041 pr_info("md: running: ");
6043 rdev_for_each(rdev
, mddev
) {
6044 char b
[BDEVNAME_SIZE
];
6045 pr_cont("<%s>", bdevname(rdev
->bdev
,b
));
6049 err
= do_md_run(mddev
);
6051 pr_warn("md: do_md_run() returned %d\n", err
);
6052 do_md_stop(mddev
, 0, NULL
);
6057 * lets try to run arrays based on all disks that have arrived
6058 * until now. (those are in pending_raid_disks)
6060 * the method: pick the first pending disk, collect all disks with
6061 * the same UUID, remove all from the pending list and put them into
6062 * the 'same_array' list. Then order this list based on superblock
6063 * update time (freshest comes first), kick out 'old' disks and
6064 * compare superblocks. If everything's fine then run it.
6066 * If "unit" is allocated, then bump its reference count
6068 static void autorun_devices(int part
)
6070 struct md_rdev
*rdev0
, *rdev
, *tmp
;
6071 struct mddev
*mddev
;
6072 char b
[BDEVNAME_SIZE
];
6074 pr_info("md: autorun ...\n");
6075 while (!list_empty(&pending_raid_disks
)) {
6078 LIST_HEAD(candidates
);
6079 rdev0
= list_entry(pending_raid_disks
.next
,
6080 struct md_rdev
, same_set
);
6082 pr_debug("md: considering %s ...\n", bdevname(rdev0
->bdev
,b
));
6083 INIT_LIST_HEAD(&candidates
);
6084 rdev_for_each_list(rdev
, tmp
, &pending_raid_disks
)
6085 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
6086 pr_debug("md: adding %s ...\n",
6087 bdevname(rdev
->bdev
,b
));
6088 list_move(&rdev
->same_set
, &candidates
);
6091 * now we have a set of devices, with all of them having
6092 * mostly sane superblocks. It's time to allocate the
6096 dev
= MKDEV(mdp_major
,
6097 rdev0
->preferred_minor
<< MdpMinorShift
);
6098 unit
= MINOR(dev
) >> MdpMinorShift
;
6100 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
6103 if (rdev0
->preferred_minor
!= unit
) {
6104 pr_warn("md: unit number in %s is bad: %d\n",
6105 bdevname(rdev0
->bdev
, b
), rdev0
->preferred_minor
);
6109 md_probe(dev
, NULL
, NULL
);
6110 mddev
= mddev_find(dev
);
6111 if (!mddev
|| !mddev
->gendisk
) {
6116 if (mddev_lock(mddev
))
6117 pr_warn("md: %s locked, cannot run\n", mdname(mddev
));
6118 else if (mddev
->raid_disks
|| mddev
->major_version
6119 || !list_empty(&mddev
->disks
)) {
6120 pr_warn("md: %s already running, cannot run %s\n",
6121 mdname(mddev
), bdevname(rdev0
->bdev
,b
));
6122 mddev_unlock(mddev
);
6124 pr_debug("md: created %s\n", mdname(mddev
));
6125 mddev
->persistent
= 1;
6126 rdev_for_each_list(rdev
, tmp
, &candidates
) {
6127 list_del_init(&rdev
->same_set
);
6128 if (bind_rdev_to_array(rdev
, mddev
))
6131 autorun_array(mddev
);
6132 mddev_unlock(mddev
);
6134 /* on success, candidates will be empty, on error
6137 rdev_for_each_list(rdev
, tmp
, &candidates
) {
6138 list_del_init(&rdev
->same_set
);
6143 pr_info("md: ... autorun DONE.\n");
6145 #endif /* !MODULE */
6147 static int get_version(void __user
*arg
)
6151 ver
.major
= MD_MAJOR_VERSION
;
6152 ver
.minor
= MD_MINOR_VERSION
;
6153 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
6155 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
6161 static int get_array_info(struct mddev
*mddev
, void __user
*arg
)
6163 mdu_array_info_t info
;
6164 int nr
,working
,insync
,failed
,spare
;
6165 struct md_rdev
*rdev
;
6167 nr
= working
= insync
= failed
= spare
= 0;
6169 rdev_for_each_rcu(rdev
, mddev
) {
6171 if (test_bit(Faulty
, &rdev
->flags
))
6175 if (test_bit(In_sync
, &rdev
->flags
))
6177 else if (test_bit(Journal
, &rdev
->flags
))
6178 /* TODO: add journal count to md_u.h */
6186 info
.major_version
= mddev
->major_version
;
6187 info
.minor_version
= mddev
->minor_version
;
6188 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
6189 info
.ctime
= clamp_t(time64_t
, mddev
->ctime
, 0, U32_MAX
);
6190 info
.level
= mddev
->level
;
6191 info
.size
= mddev
->dev_sectors
/ 2;
6192 if (info
.size
!= mddev
->dev_sectors
/ 2) /* overflow */
6195 info
.raid_disks
= mddev
->raid_disks
;
6196 info
.md_minor
= mddev
->md_minor
;
6197 info
.not_persistent
= !mddev
->persistent
;
6199 info
.utime
= clamp_t(time64_t
, mddev
->utime
, 0, U32_MAX
);
6202 info
.state
= (1<<MD_SB_CLEAN
);
6203 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
6204 info
.state
|= (1<<MD_SB_BITMAP_PRESENT
);
6205 if (mddev_is_clustered(mddev
))
6206 info
.state
|= (1<<MD_SB_CLUSTERED
);
6207 info
.active_disks
= insync
;
6208 info
.working_disks
= working
;
6209 info
.failed_disks
= failed
;
6210 info
.spare_disks
= spare
;
6212 info
.layout
= mddev
->layout
;
6213 info
.chunk_size
= mddev
->chunk_sectors
<< 9;
6215 if (copy_to_user(arg
, &info
, sizeof(info
)))
6221 static int get_bitmap_file(struct mddev
*mddev
, void __user
* arg
)
6223 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
6227 file
= kzalloc(sizeof(*file
), GFP_NOIO
);
6232 spin_lock(&mddev
->lock
);
6233 /* bitmap enabled */
6234 if (mddev
->bitmap_info
.file
) {
6235 ptr
= file_path(mddev
->bitmap_info
.file
, file
->pathname
,
6236 sizeof(file
->pathname
));
6240 memmove(file
->pathname
, ptr
,
6241 sizeof(file
->pathname
)-(ptr
-file
->pathname
));
6243 spin_unlock(&mddev
->lock
);
6246 copy_to_user(arg
, file
, sizeof(*file
)))
6253 static int get_disk_info(struct mddev
*mddev
, void __user
* arg
)
6255 mdu_disk_info_t info
;
6256 struct md_rdev
*rdev
;
6258 if (copy_from_user(&info
, arg
, sizeof(info
)))
6262 rdev
= md_find_rdev_nr_rcu(mddev
, info
.number
);
6264 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
6265 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
6266 info
.raid_disk
= rdev
->raid_disk
;
6268 if (test_bit(Faulty
, &rdev
->flags
))
6269 info
.state
|= (1<<MD_DISK_FAULTY
);
6270 else if (test_bit(In_sync
, &rdev
->flags
)) {
6271 info
.state
|= (1<<MD_DISK_ACTIVE
);
6272 info
.state
|= (1<<MD_DISK_SYNC
);
6274 if (test_bit(Journal
, &rdev
->flags
))
6275 info
.state
|= (1<<MD_DISK_JOURNAL
);
6276 if (test_bit(WriteMostly
, &rdev
->flags
))
6277 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
6278 if (test_bit(FailFast
, &rdev
->flags
))
6279 info
.state
|= (1<<MD_DISK_FAILFAST
);
6281 info
.major
= info
.minor
= 0;
6282 info
.raid_disk
= -1;
6283 info
.state
= (1<<MD_DISK_REMOVED
);
6287 if (copy_to_user(arg
, &info
, sizeof(info
)))
6293 static int add_new_disk(struct mddev
*mddev
, mdu_disk_info_t
*info
)
6295 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
6296 struct md_rdev
*rdev
;
6297 dev_t dev
= MKDEV(info
->major
,info
->minor
);
6299 if (mddev_is_clustered(mddev
) &&
6300 !(info
->state
& ((1 << MD_DISK_CLUSTER_ADD
) | (1 << MD_DISK_CANDIDATE
)))) {
6301 pr_warn("%s: Cannot add to clustered mddev.\n",
6306 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
6309 if (!mddev
->raid_disks
) {
6311 /* expecting a device which has a superblock */
6312 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
6314 pr_warn("md: md_import_device returned %ld\n",
6316 return PTR_ERR(rdev
);
6318 if (!list_empty(&mddev
->disks
)) {
6319 struct md_rdev
*rdev0
6320 = list_entry(mddev
->disks
.next
,
6321 struct md_rdev
, same_set
);
6322 err
= super_types
[mddev
->major_version
]
6323 .load_super(rdev
, rdev0
, mddev
->minor_version
);
6325 pr_warn("md: %s has different UUID to %s\n",
6326 bdevname(rdev
->bdev
,b
),
6327 bdevname(rdev0
->bdev
,b2
));
6332 err
= bind_rdev_to_array(rdev
, mddev
);
6339 * add_new_disk can be used once the array is assembled
6340 * to add "hot spares". They must already have a superblock
6345 if (!mddev
->pers
->hot_add_disk
) {
6346 pr_warn("%s: personality does not support diskops!\n",
6350 if (mddev
->persistent
)
6351 rdev
= md_import_device(dev
, mddev
->major_version
,
6352 mddev
->minor_version
);
6354 rdev
= md_import_device(dev
, -1, -1);
6356 pr_warn("md: md_import_device returned %ld\n",
6358 return PTR_ERR(rdev
);
6360 /* set saved_raid_disk if appropriate */
6361 if (!mddev
->persistent
) {
6362 if (info
->state
& (1<<MD_DISK_SYNC
) &&
6363 info
->raid_disk
< mddev
->raid_disks
) {
6364 rdev
->raid_disk
= info
->raid_disk
;
6365 set_bit(In_sync
, &rdev
->flags
);
6366 clear_bit(Bitmap_sync
, &rdev
->flags
);
6368 rdev
->raid_disk
= -1;
6369 rdev
->saved_raid_disk
= rdev
->raid_disk
;
6371 super_types
[mddev
->major_version
].
6372 validate_super(mddev
, rdev
);
6373 if ((info
->state
& (1<<MD_DISK_SYNC
)) &&
6374 rdev
->raid_disk
!= info
->raid_disk
) {
6375 /* This was a hot-add request, but events doesn't
6376 * match, so reject it.
6382 clear_bit(In_sync
, &rdev
->flags
); /* just to be sure */
6383 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
6384 set_bit(WriteMostly
, &rdev
->flags
);
6386 clear_bit(WriteMostly
, &rdev
->flags
);
6387 if (info
->state
& (1<<MD_DISK_FAILFAST
))
6388 set_bit(FailFast
, &rdev
->flags
);
6390 clear_bit(FailFast
, &rdev
->flags
);
6392 if (info
->state
& (1<<MD_DISK_JOURNAL
)) {
6393 struct md_rdev
*rdev2
;
6394 bool has_journal
= false;
6396 /* make sure no existing journal disk */
6397 rdev_for_each(rdev2
, mddev
) {
6398 if (test_bit(Journal
, &rdev2
->flags
)) {
6403 if (has_journal
|| mddev
->bitmap
) {
6407 set_bit(Journal
, &rdev
->flags
);
6410 * check whether the device shows up in other nodes
6412 if (mddev_is_clustered(mddev
)) {
6413 if (info
->state
& (1 << MD_DISK_CANDIDATE
))
6414 set_bit(Candidate
, &rdev
->flags
);
6415 else if (info
->state
& (1 << MD_DISK_CLUSTER_ADD
)) {
6416 /* --add initiated by this node */
6417 err
= md_cluster_ops
->add_new_disk(mddev
, rdev
);
6425 rdev
->raid_disk
= -1;
6426 err
= bind_rdev_to_array(rdev
, mddev
);
6431 if (mddev_is_clustered(mddev
)) {
6432 if (info
->state
& (1 << MD_DISK_CANDIDATE
)) {
6434 err
= md_cluster_ops
->new_disk_ack(mddev
,
6437 md_kick_rdev_from_array(rdev
);
6441 md_cluster_ops
->add_new_disk_cancel(mddev
);
6443 err
= add_bound_rdev(rdev
);
6447 err
= add_bound_rdev(rdev
);
6452 /* otherwise, add_new_disk is only allowed
6453 * for major_version==0 superblocks
6455 if (mddev
->major_version
!= 0) {
6456 pr_warn("%s: ADD_NEW_DISK not supported\n", mdname(mddev
));
6460 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
6462 rdev
= md_import_device(dev
, -1, 0);
6464 pr_warn("md: error, md_import_device() returned %ld\n",
6466 return PTR_ERR(rdev
);
6468 rdev
->desc_nr
= info
->number
;
6469 if (info
->raid_disk
< mddev
->raid_disks
)
6470 rdev
->raid_disk
= info
->raid_disk
;
6472 rdev
->raid_disk
= -1;
6474 if (rdev
->raid_disk
< mddev
->raid_disks
)
6475 if (info
->state
& (1<<MD_DISK_SYNC
))
6476 set_bit(In_sync
, &rdev
->flags
);
6478 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
6479 set_bit(WriteMostly
, &rdev
->flags
);
6480 if (info
->state
& (1<<MD_DISK_FAILFAST
))
6481 set_bit(FailFast
, &rdev
->flags
);
6483 if (!mddev
->persistent
) {
6484 pr_debug("md: nonpersistent superblock ...\n");
6485 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
6487 rdev
->sb_start
= calc_dev_sboffset(rdev
);
6488 rdev
->sectors
= rdev
->sb_start
;
6490 err
= bind_rdev_to_array(rdev
, mddev
);
6500 static int hot_remove_disk(struct mddev
*mddev
, dev_t dev
)
6502 char b
[BDEVNAME_SIZE
];
6503 struct md_rdev
*rdev
;
6508 rdev
= find_rdev(mddev
, dev
);
6512 if (rdev
->raid_disk
< 0)
6515 clear_bit(Blocked
, &rdev
->flags
);
6516 remove_and_add_spares(mddev
, rdev
);
6518 if (rdev
->raid_disk
>= 0)
6522 if (mddev_is_clustered(mddev
))
6523 md_cluster_ops
->remove_disk(mddev
, rdev
);
6525 md_kick_rdev_from_array(rdev
);
6526 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
6528 md_wakeup_thread(mddev
->thread
);
6530 md_update_sb(mddev
, 1);
6531 md_new_event(mddev
);
6535 pr_debug("md: cannot remove active disk %s from %s ...\n",
6536 bdevname(rdev
->bdev
,b
), mdname(mddev
));
6540 static int hot_add_disk(struct mddev
*mddev
, dev_t dev
)
6542 char b
[BDEVNAME_SIZE
];
6544 struct md_rdev
*rdev
;
6549 if (mddev
->major_version
!= 0) {
6550 pr_warn("%s: HOT_ADD may only be used with version-0 superblocks.\n",
6554 if (!mddev
->pers
->hot_add_disk
) {
6555 pr_warn("%s: personality does not support diskops!\n",
6560 rdev
= md_import_device(dev
, -1, 0);
6562 pr_warn("md: error, md_import_device() returned %ld\n",
6567 if (mddev
->persistent
)
6568 rdev
->sb_start
= calc_dev_sboffset(rdev
);
6570 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
6572 rdev
->sectors
= rdev
->sb_start
;
6574 if (test_bit(Faulty
, &rdev
->flags
)) {
6575 pr_warn("md: can not hot-add faulty %s disk to %s!\n",
6576 bdevname(rdev
->bdev
,b
), mdname(mddev
));
6581 clear_bit(In_sync
, &rdev
->flags
);
6583 rdev
->saved_raid_disk
= -1;
6584 err
= bind_rdev_to_array(rdev
, mddev
);
6589 * The rest should better be atomic, we can have disk failures
6590 * noticed in interrupt contexts ...
6593 rdev
->raid_disk
= -1;
6595 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
6597 md_update_sb(mddev
, 1);
6599 * Kick recovery, maybe this spare has to be added to the
6600 * array immediately.
6602 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6603 md_wakeup_thread(mddev
->thread
);
6604 md_new_event(mddev
);
6612 static int set_bitmap_file(struct mddev
*mddev
, int fd
)
6617 if (!mddev
->pers
->quiesce
|| !mddev
->thread
)
6619 if (mddev
->recovery
|| mddev
->sync_thread
)
6621 /* we should be able to change the bitmap.. */
6625 struct inode
*inode
;
6628 if (mddev
->bitmap
|| mddev
->bitmap_info
.file
)
6629 return -EEXIST
; /* cannot add when bitmap is present */
6633 pr_warn("%s: error: failed to get bitmap file\n",
6638 inode
= f
->f_mapping
->host
;
6639 if (!S_ISREG(inode
->i_mode
)) {
6640 pr_warn("%s: error: bitmap file must be a regular file\n",
6643 } else if (!(f
->f_mode
& FMODE_WRITE
)) {
6644 pr_warn("%s: error: bitmap file must open for write\n",
6647 } else if (atomic_read(&inode
->i_writecount
) != 1) {
6648 pr_warn("%s: error: bitmap file is already in use\n",
6656 mddev
->bitmap_info
.file
= f
;
6657 mddev
->bitmap_info
.offset
= 0; /* file overrides offset */
6658 } else if (mddev
->bitmap
== NULL
)
6659 return -ENOENT
; /* cannot remove what isn't there */
6663 struct bitmap
*bitmap
;
6665 bitmap
= md_bitmap_create(mddev
, -1);
6666 mddev_suspend(mddev
);
6667 if (!IS_ERR(bitmap
)) {
6668 mddev
->bitmap
= bitmap
;
6669 err
= md_bitmap_load(mddev
);
6671 err
= PTR_ERR(bitmap
);
6673 md_bitmap_destroy(mddev
);
6676 mddev_resume(mddev
);
6677 } else if (fd
< 0) {
6678 mddev_suspend(mddev
);
6679 md_bitmap_destroy(mddev
);
6680 mddev_resume(mddev
);
6684 struct file
*f
= mddev
->bitmap_info
.file
;
6686 spin_lock(&mddev
->lock
);
6687 mddev
->bitmap_info
.file
= NULL
;
6688 spin_unlock(&mddev
->lock
);
6697 * set_array_info is used two different ways
6698 * The original usage is when creating a new array.
6699 * In this usage, raid_disks is > 0 and it together with
6700 * level, size, not_persistent,layout,chunksize determine the
6701 * shape of the array.
6702 * This will always create an array with a type-0.90.0 superblock.
6703 * The newer usage is when assembling an array.
6704 * In this case raid_disks will be 0, and the major_version field is
6705 * use to determine which style super-blocks are to be found on the devices.
6706 * The minor and patch _version numbers are also kept incase the
6707 * super_block handler wishes to interpret them.
6709 static int set_array_info(struct mddev
*mddev
, mdu_array_info_t
*info
)
6712 if (info
->raid_disks
== 0) {
6713 /* just setting version number for superblock loading */
6714 if (info
->major_version
< 0 ||
6715 info
->major_version
>= ARRAY_SIZE(super_types
) ||
6716 super_types
[info
->major_version
].name
== NULL
) {
6717 /* maybe try to auto-load a module? */
6718 pr_warn("md: superblock version %d not known\n",
6719 info
->major_version
);
6722 mddev
->major_version
= info
->major_version
;
6723 mddev
->minor_version
= info
->minor_version
;
6724 mddev
->patch_version
= info
->patch_version
;
6725 mddev
->persistent
= !info
->not_persistent
;
6726 /* ensure mddev_put doesn't delete this now that there
6727 * is some minimal configuration.
6729 mddev
->ctime
= ktime_get_real_seconds();
6732 mddev
->major_version
= MD_MAJOR_VERSION
;
6733 mddev
->minor_version
= MD_MINOR_VERSION
;
6734 mddev
->patch_version
= MD_PATCHLEVEL_VERSION
;
6735 mddev
->ctime
= ktime_get_real_seconds();
6737 mddev
->level
= info
->level
;
6738 mddev
->clevel
[0] = 0;
6739 mddev
->dev_sectors
= 2 * (sector_t
)info
->size
;
6740 mddev
->raid_disks
= info
->raid_disks
;
6741 /* don't set md_minor, it is determined by which /dev/md* was
6744 if (info
->state
& (1<<MD_SB_CLEAN
))
6745 mddev
->recovery_cp
= MaxSector
;
6747 mddev
->recovery_cp
= 0;
6748 mddev
->persistent
= ! info
->not_persistent
;
6749 mddev
->external
= 0;
6751 mddev
->layout
= info
->layout
;
6752 mddev
->chunk_sectors
= info
->chunk_size
>> 9;
6754 if (mddev
->persistent
) {
6755 mddev
->max_disks
= MD_SB_DISKS
;
6757 mddev
->sb_flags
= 0;
6759 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
6761 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
6762 mddev
->bitmap_info
.default_space
= 64*2 - (MD_SB_BYTES
>> 9);
6763 mddev
->bitmap_info
.offset
= 0;
6765 mddev
->reshape_position
= MaxSector
;
6768 * Generate a 128 bit UUID
6770 get_random_bytes(mddev
->uuid
, 16);
6772 mddev
->new_level
= mddev
->level
;
6773 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
6774 mddev
->new_layout
= mddev
->layout
;
6775 mddev
->delta_disks
= 0;
6776 mddev
->reshape_backwards
= 0;
6781 void md_set_array_sectors(struct mddev
*mddev
, sector_t array_sectors
)
6783 lockdep_assert_held(&mddev
->reconfig_mutex
);
6785 if (mddev
->external_size
)
6788 mddev
->array_sectors
= array_sectors
;
6790 EXPORT_SYMBOL(md_set_array_sectors
);
6792 static int update_size(struct mddev
*mddev
, sector_t num_sectors
)
6794 struct md_rdev
*rdev
;
6796 int fit
= (num_sectors
== 0);
6797 sector_t old_dev_sectors
= mddev
->dev_sectors
;
6799 if (mddev
->pers
->resize
== NULL
)
6801 /* The "num_sectors" is the number of sectors of each device that
6802 * is used. This can only make sense for arrays with redundancy.
6803 * linear and raid0 always use whatever space is available. We can only
6804 * consider changing this number if no resync or reconstruction is
6805 * happening, and if the new size is acceptable. It must fit before the
6806 * sb_start or, if that is <data_offset, it must fit before the size
6807 * of each device. If num_sectors is zero, we find the largest size
6810 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
6816 rdev_for_each(rdev
, mddev
) {
6817 sector_t avail
= rdev
->sectors
;
6819 if (fit
&& (num_sectors
== 0 || num_sectors
> avail
))
6820 num_sectors
= avail
;
6821 if (avail
< num_sectors
)
6824 rv
= mddev
->pers
->resize(mddev
, num_sectors
);
6826 if (mddev_is_clustered(mddev
))
6827 md_cluster_ops
->update_size(mddev
, old_dev_sectors
);
6828 else if (mddev
->queue
) {
6829 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
6830 revalidate_disk(mddev
->gendisk
);
6836 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
)
6839 struct md_rdev
*rdev
;
6840 /* change the number of raid disks */
6841 if (mddev
->pers
->check_reshape
== NULL
)
6845 if (raid_disks
<= 0 ||
6846 (mddev
->max_disks
&& raid_disks
>= mddev
->max_disks
))
6848 if (mddev
->sync_thread
||
6849 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
6850 mddev
->reshape_position
!= MaxSector
)
6853 rdev_for_each(rdev
, mddev
) {
6854 if (mddev
->raid_disks
< raid_disks
&&
6855 rdev
->data_offset
< rdev
->new_data_offset
)
6857 if (mddev
->raid_disks
> raid_disks
&&
6858 rdev
->data_offset
> rdev
->new_data_offset
)
6862 mddev
->delta_disks
= raid_disks
- mddev
->raid_disks
;
6863 if (mddev
->delta_disks
< 0)
6864 mddev
->reshape_backwards
= 1;
6865 else if (mddev
->delta_disks
> 0)
6866 mddev
->reshape_backwards
= 0;
6868 rv
= mddev
->pers
->check_reshape(mddev
);
6870 mddev
->delta_disks
= 0;
6871 mddev
->reshape_backwards
= 0;
6877 * update_array_info is used to change the configuration of an
6879 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
6880 * fields in the info are checked against the array.
6881 * Any differences that cannot be handled will cause an error.
6882 * Normally, only one change can be managed at a time.
6884 static int update_array_info(struct mddev
*mddev
, mdu_array_info_t
*info
)
6890 /* calculate expected state,ignoring low bits */
6891 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
6892 state
|= (1 << MD_SB_BITMAP_PRESENT
);
6894 if (mddev
->major_version
!= info
->major_version
||
6895 mddev
->minor_version
!= info
->minor_version
||
6896 /* mddev->patch_version != info->patch_version || */
6897 mddev
->ctime
!= info
->ctime
||
6898 mddev
->level
!= info
->level
||
6899 /* mddev->layout != info->layout || */
6900 mddev
->persistent
!= !info
->not_persistent
||
6901 mddev
->chunk_sectors
!= info
->chunk_size
>> 9 ||
6902 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
6903 ((state
^info
->state
) & 0xfffffe00)
6906 /* Check there is only one change */
6907 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
6909 if (mddev
->raid_disks
!= info
->raid_disks
)
6911 if (mddev
->layout
!= info
->layout
)
6913 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
))
6920 if (mddev
->layout
!= info
->layout
) {
6922 * we don't need to do anything at the md level, the
6923 * personality will take care of it all.
6925 if (mddev
->pers
->check_reshape
== NULL
)
6928 mddev
->new_layout
= info
->layout
;
6929 rv
= mddev
->pers
->check_reshape(mddev
);
6931 mddev
->new_layout
= mddev
->layout
;
6935 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
6936 rv
= update_size(mddev
, (sector_t
)info
->size
* 2);
6938 if (mddev
->raid_disks
!= info
->raid_disks
)
6939 rv
= update_raid_disks(mddev
, info
->raid_disks
);
6941 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) {
6942 if (mddev
->pers
->quiesce
== NULL
|| mddev
->thread
== NULL
) {
6946 if (mddev
->recovery
|| mddev
->sync_thread
) {
6950 if (info
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
6951 struct bitmap
*bitmap
;
6952 /* add the bitmap */
6953 if (mddev
->bitmap
) {
6957 if (mddev
->bitmap_info
.default_offset
== 0) {
6961 mddev
->bitmap_info
.offset
=
6962 mddev
->bitmap_info
.default_offset
;
6963 mddev
->bitmap_info
.space
=
6964 mddev
->bitmap_info
.default_space
;
6965 bitmap
= md_bitmap_create(mddev
, -1);
6966 mddev_suspend(mddev
);
6967 if (!IS_ERR(bitmap
)) {
6968 mddev
->bitmap
= bitmap
;
6969 rv
= md_bitmap_load(mddev
);
6971 rv
= PTR_ERR(bitmap
);
6973 md_bitmap_destroy(mddev
);
6974 mddev_resume(mddev
);
6976 /* remove the bitmap */
6977 if (!mddev
->bitmap
) {
6981 if (mddev
->bitmap
->storage
.file
) {
6985 if (mddev
->bitmap_info
.nodes
) {
6986 /* hold PW on all the bitmap lock */
6987 if (md_cluster_ops
->lock_all_bitmaps(mddev
) <= 0) {
6988 pr_warn("md: can't change bitmap to none since the array is in use by more than one node\n");
6990 md_cluster_ops
->unlock_all_bitmaps(mddev
);
6994 mddev
->bitmap_info
.nodes
= 0;
6995 md_cluster_ops
->leave(mddev
);
6997 mddev_suspend(mddev
);
6998 md_bitmap_destroy(mddev
);
6999 mddev_resume(mddev
);
7000 mddev
->bitmap_info
.offset
= 0;
7003 md_update_sb(mddev
, 1);
7009 static int set_disk_faulty(struct mddev
*mddev
, dev_t dev
)
7011 struct md_rdev
*rdev
;
7014 if (mddev
->pers
== NULL
)
7018 rdev
= md_find_rdev_rcu(mddev
, dev
);
7022 md_error(mddev
, rdev
);
7023 if (!test_bit(Faulty
, &rdev
->flags
))
7031 * We have a problem here : there is no easy way to give a CHS
7032 * virtual geometry. We currently pretend that we have a 2 heads
7033 * 4 sectors (with a BIG number of cylinders...). This drives
7034 * dosfs just mad... ;-)
7036 static int md_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
7038 struct mddev
*mddev
= bdev
->bd_disk
->private_data
;
7042 geo
->cylinders
= mddev
->array_sectors
/ 8;
7046 static inline bool md_ioctl_valid(unsigned int cmd
)
7051 case GET_ARRAY_INFO
:
7052 case GET_BITMAP_FILE
:
7055 case HOT_REMOVE_DISK
:
7058 case RESTART_ARRAY_RW
:
7060 case SET_ARRAY_INFO
:
7061 case SET_BITMAP_FILE
:
7062 case SET_DISK_FAULTY
:
7065 case CLUSTERED_DISK_NACK
:
7072 static int md_ioctl(struct block_device
*bdev
, fmode_t mode
,
7073 unsigned int cmd
, unsigned long arg
)
7076 void __user
*argp
= (void __user
*)arg
;
7077 struct mddev
*mddev
= NULL
;
7079 bool did_set_md_closing
= false;
7081 if (!md_ioctl_valid(cmd
))
7086 case GET_ARRAY_INFO
:
7090 if (!capable(CAP_SYS_ADMIN
))
7095 * Commands dealing with the RAID driver but not any
7100 err
= get_version(argp
);
7106 autostart_arrays(arg
);
7113 * Commands creating/starting a new array:
7116 mddev
= bdev
->bd_disk
->private_data
;
7123 /* Some actions do not requires the mutex */
7125 case GET_ARRAY_INFO
:
7126 if (!mddev
->raid_disks
&& !mddev
->external
)
7129 err
= get_array_info(mddev
, argp
);
7133 if (!mddev
->raid_disks
&& !mddev
->external
)
7136 err
= get_disk_info(mddev
, argp
);
7139 case SET_DISK_FAULTY
:
7140 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
7143 case GET_BITMAP_FILE
:
7144 err
= get_bitmap_file(mddev
, argp
);
7149 if (cmd
== ADD_NEW_DISK
)
7150 /* need to ensure md_delayed_delete() has completed */
7151 flush_workqueue(md_misc_wq
);
7153 if (cmd
== HOT_REMOVE_DISK
)
7154 /* need to ensure recovery thread has run */
7155 wait_event_interruptible_timeout(mddev
->sb_wait
,
7156 !test_bit(MD_RECOVERY_NEEDED
,
7158 msecs_to_jiffies(5000));
7159 if (cmd
== STOP_ARRAY
|| cmd
== STOP_ARRAY_RO
) {
7160 /* Need to flush page cache, and ensure no-one else opens
7163 mutex_lock(&mddev
->open_mutex
);
7164 if (mddev
->pers
&& atomic_read(&mddev
->openers
) > 1) {
7165 mutex_unlock(&mddev
->open_mutex
);
7169 WARN_ON_ONCE(test_bit(MD_CLOSING
, &mddev
->flags
));
7170 set_bit(MD_CLOSING
, &mddev
->flags
);
7171 did_set_md_closing
= true;
7172 mutex_unlock(&mddev
->open_mutex
);
7173 sync_blockdev(bdev
);
7175 err
= mddev_lock(mddev
);
7177 pr_debug("md: ioctl lock interrupted, reason %d, cmd %d\n",
7182 if (cmd
== SET_ARRAY_INFO
) {
7183 mdu_array_info_t info
;
7185 memset(&info
, 0, sizeof(info
));
7186 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
7191 err
= update_array_info(mddev
, &info
);
7193 pr_warn("md: couldn't update array info. %d\n", err
);
7198 if (!list_empty(&mddev
->disks
)) {
7199 pr_warn("md: array %s already has disks!\n", mdname(mddev
));
7203 if (mddev
->raid_disks
) {
7204 pr_warn("md: array %s already initialised!\n", mdname(mddev
));
7208 err
= set_array_info(mddev
, &info
);
7210 pr_warn("md: couldn't set array info. %d\n", err
);
7217 * Commands querying/configuring an existing array:
7219 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
7220 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
7221 if ((!mddev
->raid_disks
&& !mddev
->external
)
7222 && cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
7223 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
7224 && cmd
!= GET_BITMAP_FILE
) {
7230 * Commands even a read-only array can execute:
7233 case RESTART_ARRAY_RW
:
7234 err
= restart_array(mddev
);
7238 err
= do_md_stop(mddev
, 0, bdev
);
7242 err
= md_set_readonly(mddev
, bdev
);
7245 case HOT_REMOVE_DISK
:
7246 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
7250 /* We can support ADD_NEW_DISK on read-only arrays
7251 * only if we are re-adding a preexisting device.
7252 * So require mddev->pers and MD_DISK_SYNC.
7255 mdu_disk_info_t info
;
7256 if (copy_from_user(&info
, argp
, sizeof(info
)))
7258 else if (!(info
.state
& (1<<MD_DISK_SYNC
)))
7259 /* Need to clear read-only for this */
7262 err
= add_new_disk(mddev
, &info
);
7268 if (get_user(ro
, (int __user
*)(arg
))) {
7274 /* if the bdev is going readonly the value of mddev->ro
7275 * does not matter, no writes are coming
7280 /* are we are already prepared for writes? */
7284 /* transitioning to readauto need only happen for
7285 * arrays that call md_write_start
7288 err
= restart_array(mddev
);
7291 set_disk_ro(mddev
->gendisk
, 0);
7298 * The remaining ioctls are changing the state of the
7299 * superblock, so we do not allow them on read-only arrays.
7301 if (mddev
->ro
&& mddev
->pers
) {
7302 if (mddev
->ro
== 2) {
7304 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7305 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7306 /* mddev_unlock will wake thread */
7307 /* If a device failed while we were read-only, we
7308 * need to make sure the metadata is updated now.
7310 if (test_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
)) {
7311 mddev_unlock(mddev
);
7312 wait_event(mddev
->sb_wait
,
7313 !test_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
) &&
7314 !test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
));
7315 mddev_lock_nointr(mddev
);
7326 mdu_disk_info_t info
;
7327 if (copy_from_user(&info
, argp
, sizeof(info
)))
7330 err
= add_new_disk(mddev
, &info
);
7334 case CLUSTERED_DISK_NACK
:
7335 if (mddev_is_clustered(mddev
))
7336 md_cluster_ops
->new_disk_ack(mddev
, false);
7342 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
7346 err
= do_md_run(mddev
);
7349 case SET_BITMAP_FILE
:
7350 err
= set_bitmap_file(mddev
, (int)arg
);
7359 if (mddev
->hold_active
== UNTIL_IOCTL
&&
7361 mddev
->hold_active
= 0;
7362 mddev_unlock(mddev
);
7364 if(did_set_md_closing
)
7365 clear_bit(MD_CLOSING
, &mddev
->flags
);
7368 #ifdef CONFIG_COMPAT
7369 static int md_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
7370 unsigned int cmd
, unsigned long arg
)
7373 case HOT_REMOVE_DISK
:
7375 case SET_DISK_FAULTY
:
7376 case SET_BITMAP_FILE
:
7377 /* These take in integer arg, do not convert */
7380 arg
= (unsigned long)compat_ptr(arg
);
7384 return md_ioctl(bdev
, mode
, cmd
, arg
);
7386 #endif /* CONFIG_COMPAT */
7388 static int md_open(struct block_device
*bdev
, fmode_t mode
)
7391 * Succeed if we can lock the mddev, which confirms that
7392 * it isn't being stopped right now.
7394 struct mddev
*mddev
= mddev_find(bdev
->bd_dev
);
7400 if (mddev
->gendisk
!= bdev
->bd_disk
) {
7401 /* we are racing with mddev_put which is discarding this
7405 /* Wait until bdev->bd_disk is definitely gone */
7406 flush_workqueue(md_misc_wq
);
7407 /* Then retry the open from the top */
7408 return -ERESTARTSYS
;
7410 BUG_ON(mddev
!= bdev
->bd_disk
->private_data
);
7412 if ((err
= mutex_lock_interruptible(&mddev
->open_mutex
)))
7415 if (test_bit(MD_CLOSING
, &mddev
->flags
)) {
7416 mutex_unlock(&mddev
->open_mutex
);
7422 atomic_inc(&mddev
->openers
);
7423 mutex_unlock(&mddev
->open_mutex
);
7425 check_disk_change(bdev
);
7432 static void md_release(struct gendisk
*disk
, fmode_t mode
)
7434 struct mddev
*mddev
= disk
->private_data
;
7437 atomic_dec(&mddev
->openers
);
7441 static int md_media_changed(struct gendisk
*disk
)
7443 struct mddev
*mddev
= disk
->private_data
;
7445 return mddev
->changed
;
7448 static int md_revalidate(struct gendisk
*disk
)
7450 struct mddev
*mddev
= disk
->private_data
;
7455 static const struct block_device_operations md_fops
=
7457 .owner
= THIS_MODULE
,
7459 .release
= md_release
,
7461 #ifdef CONFIG_COMPAT
7462 .compat_ioctl
= md_compat_ioctl
,
7464 .getgeo
= md_getgeo
,
7465 .media_changed
= md_media_changed
,
7466 .revalidate_disk
= md_revalidate
,
7469 static int md_thread(void *arg
)
7471 struct md_thread
*thread
= arg
;
7474 * md_thread is a 'system-thread', it's priority should be very
7475 * high. We avoid resource deadlocks individually in each
7476 * raid personality. (RAID5 does preallocation) We also use RR and
7477 * the very same RT priority as kswapd, thus we will never get
7478 * into a priority inversion deadlock.
7480 * we definitely have to have equal or higher priority than
7481 * bdflush, otherwise bdflush will deadlock if there are too
7482 * many dirty RAID5 blocks.
7485 allow_signal(SIGKILL
);
7486 while (!kthread_should_stop()) {
7488 /* We need to wait INTERRUPTIBLE so that
7489 * we don't add to the load-average.
7490 * That means we need to be sure no signals are
7493 if (signal_pending(current
))
7494 flush_signals(current
);
7496 wait_event_interruptible_timeout
7498 test_bit(THREAD_WAKEUP
, &thread
->flags
)
7499 || kthread_should_stop() || kthread_should_park(),
7502 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
7503 if (kthread_should_park())
7505 if (!kthread_should_stop())
7506 thread
->run(thread
);
7512 void md_wakeup_thread(struct md_thread
*thread
)
7515 pr_debug("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
7516 set_bit(THREAD_WAKEUP
, &thread
->flags
);
7517 wake_up(&thread
->wqueue
);
7520 EXPORT_SYMBOL(md_wakeup_thread
);
7522 struct md_thread
*md_register_thread(void (*run
) (struct md_thread
*),
7523 struct mddev
*mddev
, const char *name
)
7525 struct md_thread
*thread
;
7527 thread
= kzalloc(sizeof(struct md_thread
), GFP_KERNEL
);
7531 init_waitqueue_head(&thread
->wqueue
);
7534 thread
->mddev
= mddev
;
7535 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
7536 thread
->tsk
= kthread_run(md_thread
, thread
,
7538 mdname(thread
->mddev
),
7540 if (IS_ERR(thread
->tsk
)) {
7546 EXPORT_SYMBOL(md_register_thread
);
7548 void md_unregister_thread(struct md_thread
**threadp
)
7550 struct md_thread
*thread
= *threadp
;
7553 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread
->tsk
));
7554 /* Locking ensures that mddev_unlock does not wake_up a
7555 * non-existent thread
7557 spin_lock(&pers_lock
);
7559 spin_unlock(&pers_lock
);
7561 kthread_stop(thread
->tsk
);
7564 EXPORT_SYMBOL(md_unregister_thread
);
7566 void md_error(struct mddev
*mddev
, struct md_rdev
*rdev
)
7568 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
7571 if (!mddev
->pers
|| !mddev
->pers
->error_handler
)
7573 mddev
->pers
->error_handler(mddev
,rdev
);
7574 if (mddev
->degraded
)
7575 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7576 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
7577 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7578 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7579 md_wakeup_thread(mddev
->thread
);
7580 if (mddev
->event_work
.func
)
7581 queue_work(md_misc_wq
, &mddev
->event_work
);
7582 md_new_event(mddev
);
7584 EXPORT_SYMBOL(md_error
);
7586 /* seq_file implementation /proc/mdstat */
7588 static void status_unused(struct seq_file
*seq
)
7591 struct md_rdev
*rdev
;
7593 seq_printf(seq
, "unused devices: ");
7595 list_for_each_entry(rdev
, &pending_raid_disks
, same_set
) {
7596 char b
[BDEVNAME_SIZE
];
7598 seq_printf(seq
, "%s ",
7599 bdevname(rdev
->bdev
,b
));
7602 seq_printf(seq
, "<none>");
7604 seq_printf(seq
, "\n");
7607 static int status_resync(struct seq_file
*seq
, struct mddev
*mddev
)
7609 sector_t max_sectors
, resync
, res
;
7610 unsigned long dt
, db
= 0;
7611 sector_t rt
, curr_mark_cnt
, resync_mark_cnt
;
7612 int scale
, recovery_active
;
7613 unsigned int per_milli
;
7615 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
7616 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
7617 max_sectors
= mddev
->resync_max_sectors
;
7619 max_sectors
= mddev
->dev_sectors
;
7621 resync
= mddev
->curr_resync
;
7623 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
7624 /* Still cleaning up */
7625 resync
= max_sectors
;
7626 } else if (resync
> max_sectors
)
7627 resync
= max_sectors
;
7629 resync
-= atomic_read(&mddev
->recovery_active
);
7632 if (test_bit(MD_RESYNCING_REMOTE
, &mddev
->recovery
)) {
7633 struct md_rdev
*rdev
;
7635 rdev_for_each(rdev
, mddev
)
7636 if (rdev
->raid_disk
>= 0 &&
7637 !test_bit(Faulty
, &rdev
->flags
) &&
7638 rdev
->recovery_offset
!= MaxSector
&&
7639 rdev
->recovery_offset
) {
7640 seq_printf(seq
, "\trecover=REMOTE");
7643 if (mddev
->reshape_position
!= MaxSector
)
7644 seq_printf(seq
, "\treshape=REMOTE");
7646 seq_printf(seq
, "\tresync=REMOTE");
7649 if (mddev
->recovery_cp
< MaxSector
) {
7650 seq_printf(seq
, "\tresync=PENDING");
7656 seq_printf(seq
, "\tresync=DELAYED");
7660 WARN_ON(max_sectors
== 0);
7661 /* Pick 'scale' such that (resync>>scale)*1000 will fit
7662 * in a sector_t, and (max_sectors>>scale) will fit in a
7663 * u32, as those are the requirements for sector_div.
7664 * Thus 'scale' must be at least 10
7667 if (sizeof(sector_t
) > sizeof(unsigned long)) {
7668 while ( max_sectors
/2 > (1ULL<<(scale
+32)))
7671 res
= (resync
>>scale
)*1000;
7672 sector_div(res
, (u32
)((max_sectors
>>scale
)+1));
7676 int i
, x
= per_milli
/50, y
= 20-x
;
7677 seq_printf(seq
, "[");
7678 for (i
= 0; i
< x
; i
++)
7679 seq_printf(seq
, "=");
7680 seq_printf(seq
, ">");
7681 for (i
= 0; i
< y
; i
++)
7682 seq_printf(seq
, ".");
7683 seq_printf(seq
, "] ");
7685 seq_printf(seq
, " %s =%3u.%u%% (%llu/%llu)",
7686 (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)?
7688 (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)?
7690 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
7691 "resync" : "recovery"))),
7692 per_milli
/10, per_milli
% 10,
7693 (unsigned long long) resync
/2,
7694 (unsigned long long) max_sectors
/2);
7697 * dt: time from mark until now
7698 * db: blocks written from mark until now
7699 * rt: remaining time
7701 * rt is a sector_t, which is always 64bit now. We are keeping
7702 * the original algorithm, but it is not really necessary.
7704 * Original algorithm:
7705 * So we divide before multiply in case it is 32bit and close
7707 * We scale the divisor (db) by 32 to avoid losing precision
7708 * near the end of resync when the number of remaining sectors
7710 * We then divide rt by 32 after multiplying by db to compensate.
7711 * The '+1' avoids division by zero if db is very small.
7713 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
7716 curr_mark_cnt
= mddev
->curr_mark_cnt
;
7717 recovery_active
= atomic_read(&mddev
->recovery_active
);
7718 resync_mark_cnt
= mddev
->resync_mark_cnt
;
7720 if (curr_mark_cnt
>= (recovery_active
+ resync_mark_cnt
))
7721 db
= curr_mark_cnt
- (recovery_active
+ resync_mark_cnt
);
7723 rt
= max_sectors
- resync
; /* number of remaining sectors */
7724 rt
= div64_u64(rt
, db
/32+1);
7728 seq_printf(seq
, " finish=%lu.%lumin", (unsigned long)rt
/ 60,
7729 ((unsigned long)rt
% 60)/6);
7731 seq_printf(seq
, " speed=%ldK/sec", db
/2/dt
);
7735 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
7737 struct list_head
*tmp
;
7739 struct mddev
*mddev
;
7747 spin_lock(&all_mddevs_lock
);
7748 list_for_each(tmp
,&all_mddevs
)
7750 mddev
= list_entry(tmp
, struct mddev
, all_mddevs
);
7752 spin_unlock(&all_mddevs_lock
);
7755 spin_unlock(&all_mddevs_lock
);
7757 return (void*)2;/* tail */
7761 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
7763 struct list_head
*tmp
;
7764 struct mddev
*next_mddev
, *mddev
= v
;
7770 spin_lock(&all_mddevs_lock
);
7772 tmp
= all_mddevs
.next
;
7774 tmp
= mddev
->all_mddevs
.next
;
7775 if (tmp
!= &all_mddevs
)
7776 next_mddev
= mddev_get(list_entry(tmp
,struct mddev
,all_mddevs
));
7778 next_mddev
= (void*)2;
7781 spin_unlock(&all_mddevs_lock
);
7789 static void md_seq_stop(struct seq_file
*seq
, void *v
)
7791 struct mddev
*mddev
= v
;
7793 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
7797 static int md_seq_show(struct seq_file
*seq
, void *v
)
7799 struct mddev
*mddev
= v
;
7801 struct md_rdev
*rdev
;
7803 if (v
== (void*)1) {
7804 struct md_personality
*pers
;
7805 seq_printf(seq
, "Personalities : ");
7806 spin_lock(&pers_lock
);
7807 list_for_each_entry(pers
, &pers_list
, list
)
7808 seq_printf(seq
, "[%s] ", pers
->name
);
7810 spin_unlock(&pers_lock
);
7811 seq_printf(seq
, "\n");
7812 seq
->poll_event
= atomic_read(&md_event_count
);
7815 if (v
== (void*)2) {
7820 spin_lock(&mddev
->lock
);
7821 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
7822 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
7823 mddev
->pers
? "" : "in");
7826 seq_printf(seq
, " (read-only)");
7828 seq_printf(seq
, " (auto-read-only)");
7829 seq_printf(seq
, " %s", mddev
->pers
->name
);
7834 rdev_for_each_rcu(rdev
, mddev
) {
7835 char b
[BDEVNAME_SIZE
];
7836 seq_printf(seq
, " %s[%d]",
7837 bdevname(rdev
->bdev
,b
), rdev
->desc_nr
);
7838 if (test_bit(WriteMostly
, &rdev
->flags
))
7839 seq_printf(seq
, "(W)");
7840 if (test_bit(Journal
, &rdev
->flags
))
7841 seq_printf(seq
, "(J)");
7842 if (test_bit(Faulty
, &rdev
->flags
)) {
7843 seq_printf(seq
, "(F)");
7846 if (rdev
->raid_disk
< 0)
7847 seq_printf(seq
, "(S)"); /* spare */
7848 if (test_bit(Replacement
, &rdev
->flags
))
7849 seq_printf(seq
, "(R)");
7850 sectors
+= rdev
->sectors
;
7854 if (!list_empty(&mddev
->disks
)) {
7856 seq_printf(seq
, "\n %llu blocks",
7857 (unsigned long long)
7858 mddev
->array_sectors
/ 2);
7860 seq_printf(seq
, "\n %llu blocks",
7861 (unsigned long long)sectors
/ 2);
7863 if (mddev
->persistent
) {
7864 if (mddev
->major_version
!= 0 ||
7865 mddev
->minor_version
!= 90) {
7866 seq_printf(seq
," super %d.%d",
7867 mddev
->major_version
,
7868 mddev
->minor_version
);
7870 } else if (mddev
->external
)
7871 seq_printf(seq
, " super external:%s",
7872 mddev
->metadata_type
);
7874 seq_printf(seq
, " super non-persistent");
7877 mddev
->pers
->status(seq
, mddev
);
7878 seq_printf(seq
, "\n ");
7879 if (mddev
->pers
->sync_request
) {
7880 if (status_resync(seq
, mddev
))
7881 seq_printf(seq
, "\n ");
7884 seq_printf(seq
, "\n ");
7886 md_bitmap_status(seq
, mddev
->bitmap
);
7888 seq_printf(seq
, "\n");
7890 spin_unlock(&mddev
->lock
);
7895 static const struct seq_operations md_seq_ops
= {
7896 .start
= md_seq_start
,
7897 .next
= md_seq_next
,
7898 .stop
= md_seq_stop
,
7899 .show
= md_seq_show
,
7902 static int md_seq_open(struct inode
*inode
, struct file
*file
)
7904 struct seq_file
*seq
;
7907 error
= seq_open(file
, &md_seq_ops
);
7911 seq
= file
->private_data
;
7912 seq
->poll_event
= atomic_read(&md_event_count
);
7916 static int md_unloading
;
7917 static __poll_t
mdstat_poll(struct file
*filp
, poll_table
*wait
)
7919 struct seq_file
*seq
= filp
->private_data
;
7923 return EPOLLIN
|EPOLLRDNORM
|EPOLLERR
|EPOLLPRI
;
7924 poll_wait(filp
, &md_event_waiters
, wait
);
7926 /* always allow read */
7927 mask
= EPOLLIN
| EPOLLRDNORM
;
7929 if (seq
->poll_event
!= atomic_read(&md_event_count
))
7930 mask
|= EPOLLERR
| EPOLLPRI
;
7934 static const struct file_operations md_seq_fops
= {
7935 .owner
= THIS_MODULE
,
7936 .open
= md_seq_open
,
7938 .llseek
= seq_lseek
,
7939 .release
= seq_release
,
7940 .poll
= mdstat_poll
,
7943 int register_md_personality(struct md_personality
*p
)
7945 pr_debug("md: %s personality registered for level %d\n",
7947 spin_lock(&pers_lock
);
7948 list_add_tail(&p
->list
, &pers_list
);
7949 spin_unlock(&pers_lock
);
7952 EXPORT_SYMBOL(register_md_personality
);
7954 int unregister_md_personality(struct md_personality
*p
)
7956 pr_debug("md: %s personality unregistered\n", p
->name
);
7957 spin_lock(&pers_lock
);
7958 list_del_init(&p
->list
);
7959 spin_unlock(&pers_lock
);
7962 EXPORT_SYMBOL(unregister_md_personality
);
7964 int register_md_cluster_operations(struct md_cluster_operations
*ops
,
7965 struct module
*module
)
7968 spin_lock(&pers_lock
);
7969 if (md_cluster_ops
!= NULL
)
7972 md_cluster_ops
= ops
;
7973 md_cluster_mod
= module
;
7975 spin_unlock(&pers_lock
);
7978 EXPORT_SYMBOL(register_md_cluster_operations
);
7980 int unregister_md_cluster_operations(void)
7982 spin_lock(&pers_lock
);
7983 md_cluster_ops
= NULL
;
7984 spin_unlock(&pers_lock
);
7987 EXPORT_SYMBOL(unregister_md_cluster_operations
);
7989 int md_setup_cluster(struct mddev
*mddev
, int nodes
)
7991 if (!md_cluster_ops
)
7992 request_module("md-cluster");
7993 spin_lock(&pers_lock
);
7994 /* ensure module won't be unloaded */
7995 if (!md_cluster_ops
|| !try_module_get(md_cluster_mod
)) {
7996 pr_warn("can't find md-cluster module or get it's reference.\n");
7997 spin_unlock(&pers_lock
);
8000 spin_unlock(&pers_lock
);
8002 return md_cluster_ops
->join(mddev
, nodes
);
8005 void md_cluster_stop(struct mddev
*mddev
)
8007 if (!md_cluster_ops
)
8009 md_cluster_ops
->leave(mddev
);
8010 module_put(md_cluster_mod
);
8013 static int is_mddev_idle(struct mddev
*mddev
, int init
)
8015 struct md_rdev
*rdev
;
8021 rdev_for_each_rcu(rdev
, mddev
) {
8022 struct gendisk
*disk
= rdev
->bdev
->bd_contains
->bd_disk
;
8023 curr_events
= (int)part_stat_read_accum(&disk
->part0
, sectors
) -
8024 atomic_read(&disk
->sync_io
);
8025 /* sync IO will cause sync_io to increase before the disk_stats
8026 * as sync_io is counted when a request starts, and
8027 * disk_stats is counted when it completes.
8028 * So resync activity will cause curr_events to be smaller than
8029 * when there was no such activity.
8030 * non-sync IO will cause disk_stat to increase without
8031 * increasing sync_io so curr_events will (eventually)
8032 * be larger than it was before. Once it becomes
8033 * substantially larger, the test below will cause
8034 * the array to appear non-idle, and resync will slow
8036 * If there is a lot of outstanding resync activity when
8037 * we set last_event to curr_events, then all that activity
8038 * completing might cause the array to appear non-idle
8039 * and resync will be slowed down even though there might
8040 * not have been non-resync activity. This will only
8041 * happen once though. 'last_events' will soon reflect
8042 * the state where there is little or no outstanding
8043 * resync requests, and further resync activity will
8044 * always make curr_events less than last_events.
8047 if (init
|| curr_events
- rdev
->last_events
> 64) {
8048 rdev
->last_events
= curr_events
;
8056 void md_done_sync(struct mddev
*mddev
, int blocks
, int ok
)
8058 /* another "blocks" (512byte) blocks have been synced */
8059 atomic_sub(blocks
, &mddev
->recovery_active
);
8060 wake_up(&mddev
->recovery_wait
);
8062 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8063 set_bit(MD_RECOVERY_ERROR
, &mddev
->recovery
);
8064 md_wakeup_thread(mddev
->thread
);
8065 // stop recovery, signal do_sync ....
8068 EXPORT_SYMBOL(md_done_sync
);
8070 /* md_write_start(mddev, bi)
8071 * If we need to update some array metadata (e.g. 'active' flag
8072 * in superblock) before writing, schedule a superblock update
8073 * and wait for it to complete.
8074 * A return value of 'false' means that the write wasn't recorded
8075 * and cannot proceed as the array is being suspend.
8077 bool md_write_start(struct mddev
*mddev
, struct bio
*bi
)
8081 if (bio_data_dir(bi
) != WRITE
)
8084 BUG_ON(mddev
->ro
== 1);
8085 if (mddev
->ro
== 2) {
8086 /* need to switch to read/write */
8088 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
8089 md_wakeup_thread(mddev
->thread
);
8090 md_wakeup_thread(mddev
->sync_thread
);
8094 percpu_ref_get(&mddev
->writes_pending
);
8095 smp_mb(); /* Match smp_mb in set_in_sync() */
8096 if (mddev
->safemode
== 1)
8097 mddev
->safemode
= 0;
8098 /* sync_checkers is always 0 when writes_pending is in per-cpu mode */
8099 if (mddev
->in_sync
|| mddev
->sync_checkers
) {
8100 spin_lock(&mddev
->lock
);
8101 if (mddev
->in_sync
) {
8103 set_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
8104 set_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
8105 md_wakeup_thread(mddev
->thread
);
8108 spin_unlock(&mddev
->lock
);
8112 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
8113 if (!mddev
->has_superblocks
)
8115 wait_event(mddev
->sb_wait
,
8116 !test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
) ||
8118 if (test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
)) {
8119 percpu_ref_put(&mddev
->writes_pending
);
8124 EXPORT_SYMBOL(md_write_start
);
8126 /* md_write_inc can only be called when md_write_start() has
8127 * already been called at least once of the current request.
8128 * It increments the counter and is useful when a single request
8129 * is split into several parts. Each part causes an increment and
8130 * so needs a matching md_write_end().
8131 * Unlike md_write_start(), it is safe to call md_write_inc() inside
8132 * a spinlocked region.
8134 void md_write_inc(struct mddev
*mddev
, struct bio
*bi
)
8136 if (bio_data_dir(bi
) != WRITE
)
8138 WARN_ON_ONCE(mddev
->in_sync
|| mddev
->ro
);
8139 percpu_ref_get(&mddev
->writes_pending
);
8141 EXPORT_SYMBOL(md_write_inc
);
8143 void md_write_end(struct mddev
*mddev
)
8145 percpu_ref_put(&mddev
->writes_pending
);
8147 if (mddev
->safemode
== 2)
8148 md_wakeup_thread(mddev
->thread
);
8149 else if (mddev
->safemode_delay
)
8150 /* The roundup() ensures this only performs locking once
8151 * every ->safemode_delay jiffies
8153 mod_timer(&mddev
->safemode_timer
,
8154 roundup(jiffies
, mddev
->safemode_delay
) +
8155 mddev
->safemode_delay
);
8158 EXPORT_SYMBOL(md_write_end
);
8160 /* md_allow_write(mddev)
8161 * Calling this ensures that the array is marked 'active' so that writes
8162 * may proceed without blocking. It is important to call this before
8163 * attempting a GFP_KERNEL allocation while holding the mddev lock.
8164 * Must be called with mddev_lock held.
8166 void md_allow_write(struct mddev
*mddev
)
8172 if (!mddev
->pers
->sync_request
)
8175 spin_lock(&mddev
->lock
);
8176 if (mddev
->in_sync
) {
8178 set_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
8179 set_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
8180 if (mddev
->safemode_delay
&&
8181 mddev
->safemode
== 0)
8182 mddev
->safemode
= 1;
8183 spin_unlock(&mddev
->lock
);
8184 md_update_sb(mddev
, 0);
8185 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
8186 /* wait for the dirty state to be recorded in the metadata */
8187 wait_event(mddev
->sb_wait
,
8188 !test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
));
8190 spin_unlock(&mddev
->lock
);
8192 EXPORT_SYMBOL_GPL(md_allow_write
);
8194 #define SYNC_MARKS 10
8195 #define SYNC_MARK_STEP (3*HZ)
8196 #define UPDATE_FREQUENCY (5*60*HZ)
8197 void md_do_sync(struct md_thread
*thread
)
8199 struct mddev
*mddev
= thread
->mddev
;
8200 struct mddev
*mddev2
;
8201 unsigned int currspeed
= 0,
8203 sector_t max_sectors
,j
, io_sectors
, recovery_done
;
8204 unsigned long mark
[SYNC_MARKS
];
8205 unsigned long update_time
;
8206 sector_t mark_cnt
[SYNC_MARKS
];
8208 struct list_head
*tmp
;
8209 sector_t last_check
;
8211 struct md_rdev
*rdev
;
8212 char *desc
, *action
= NULL
;
8213 struct blk_plug plug
;
8216 /* just incase thread restarts... */
8217 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
8218 test_bit(MD_RECOVERY_WAIT
, &mddev
->recovery
))
8220 if (mddev
->ro
) {/* never try to sync a read-only array */
8221 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8225 if (mddev_is_clustered(mddev
)) {
8226 ret
= md_cluster_ops
->resync_start(mddev
);
8230 set_bit(MD_CLUSTER_RESYNC_LOCKED
, &mddev
->flags
);
8231 if (!(test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
8232 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) ||
8233 test_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
))
8234 && ((unsigned long long)mddev
->curr_resync_completed
8235 < (unsigned long long)mddev
->resync_max_sectors
))
8239 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
8240 if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)) {
8241 desc
= "data-check";
8243 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
8244 desc
= "requested-resync";
8248 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
8253 mddev
->last_sync_action
= action
?: desc
;
8255 /* we overload curr_resync somewhat here.
8256 * 0 == not engaged in resync at all
8257 * 2 == checking that there is no conflict with another sync
8258 * 1 == like 2, but have yielded to allow conflicting resync to
8260 * other == active in resync - this many blocks
8262 * Before starting a resync we must have set curr_resync to
8263 * 2, and then checked that every "conflicting" array has curr_resync
8264 * less than ours. When we find one that is the same or higher
8265 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
8266 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
8267 * This will mean we have to start checking from the beginning again.
8272 int mddev2_minor
= -1;
8273 mddev
->curr_resync
= 2;
8276 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
8278 for_each_mddev(mddev2
, tmp
) {
8279 if (mddev2
== mddev
)
8281 if (!mddev
->parallel_resync
8282 && mddev2
->curr_resync
8283 && match_mddev_units(mddev
, mddev2
)) {
8285 if (mddev
< mddev2
&& mddev
->curr_resync
== 2) {
8286 /* arbitrarily yield */
8287 mddev
->curr_resync
= 1;
8288 wake_up(&resync_wait
);
8290 if (mddev
> mddev2
&& mddev
->curr_resync
== 1)
8291 /* no need to wait here, we can wait the next
8292 * time 'round when curr_resync == 2
8295 /* We need to wait 'interruptible' so as not to
8296 * contribute to the load average, and not to
8297 * be caught by 'softlockup'
8299 prepare_to_wait(&resync_wait
, &wq
, TASK_INTERRUPTIBLE
);
8300 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
8301 mddev2
->curr_resync
>= mddev
->curr_resync
) {
8302 if (mddev2_minor
!= mddev2
->md_minor
) {
8303 mddev2_minor
= mddev2
->md_minor
;
8304 pr_info("md: delaying %s of %s until %s has finished (they share one or more physical units)\n",
8305 desc
, mdname(mddev
),
8309 if (signal_pending(current
))
8310 flush_signals(current
);
8312 finish_wait(&resync_wait
, &wq
);
8315 finish_wait(&resync_wait
, &wq
);
8318 } while (mddev
->curr_resync
< 2);
8321 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
8322 /* resync follows the size requested by the personality,
8323 * which defaults to physical size, but can be virtual size
8325 max_sectors
= mddev
->resync_max_sectors
;
8326 atomic64_set(&mddev
->resync_mismatches
, 0);
8327 /* we don't use the checkpoint if there's a bitmap */
8328 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
8329 j
= mddev
->resync_min
;
8330 else if (!mddev
->bitmap
)
8331 j
= mddev
->recovery_cp
;
8333 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)) {
8334 max_sectors
= mddev
->resync_max_sectors
;
8336 * If the original node aborts reshaping then we continue the
8337 * reshaping, so set j again to avoid restart reshape from the
8340 if (mddev_is_clustered(mddev
) &&
8341 mddev
->reshape_position
!= MaxSector
)
8342 j
= mddev
->reshape_position
;
8344 /* recovery follows the physical size of devices */
8345 max_sectors
= mddev
->dev_sectors
;
8348 rdev_for_each_rcu(rdev
, mddev
)
8349 if (rdev
->raid_disk
>= 0 &&
8350 !test_bit(Journal
, &rdev
->flags
) &&
8351 !test_bit(Faulty
, &rdev
->flags
) &&
8352 !test_bit(In_sync
, &rdev
->flags
) &&
8353 rdev
->recovery_offset
< j
)
8354 j
= rdev
->recovery_offset
;
8357 /* If there is a bitmap, we need to make sure all
8358 * writes that started before we added a spare
8359 * complete before we start doing a recovery.
8360 * Otherwise the write might complete and (via
8361 * bitmap_endwrite) set a bit in the bitmap after the
8362 * recovery has checked that bit and skipped that
8365 if (mddev
->bitmap
) {
8366 mddev
->pers
->quiesce(mddev
, 1);
8367 mddev
->pers
->quiesce(mddev
, 0);
8371 pr_info("md: %s of RAID array %s\n", desc
, mdname(mddev
));
8372 pr_debug("md: minimum _guaranteed_ speed: %d KB/sec/disk.\n", speed_min(mddev
));
8373 pr_debug("md: using maximum available idle IO bandwidth (but not more than %d KB/sec) for %s.\n",
8374 speed_max(mddev
), desc
);
8376 is_mddev_idle(mddev
, 1); /* this initializes IO event counters */
8379 for (m
= 0; m
< SYNC_MARKS
; m
++) {
8381 mark_cnt
[m
] = io_sectors
;
8384 mddev
->resync_mark
= mark
[last_mark
];
8385 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
8388 * Tune reconstruction:
8390 window
= 32*(PAGE_SIZE
/512);
8391 pr_debug("md: using %dk window, over a total of %lluk.\n",
8392 window
/2, (unsigned long long)max_sectors
/2);
8394 atomic_set(&mddev
->recovery_active
, 0);
8398 pr_debug("md: resuming %s of %s from checkpoint.\n",
8399 desc
, mdname(mddev
));
8400 mddev
->curr_resync
= j
;
8402 mddev
->curr_resync
= 3; /* no longer delayed */
8403 mddev
->curr_resync_completed
= j
;
8404 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
8405 md_new_event(mddev
);
8406 update_time
= jiffies
;
8408 blk_start_plug(&plug
);
8409 while (j
< max_sectors
) {
8414 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
8415 ((mddev
->curr_resync
> mddev
->curr_resync_completed
&&
8416 (mddev
->curr_resync
- mddev
->curr_resync_completed
)
8417 > (max_sectors
>> 4)) ||
8418 time_after_eq(jiffies
, update_time
+ UPDATE_FREQUENCY
) ||
8419 (j
- mddev
->curr_resync_completed
)*2
8420 >= mddev
->resync_max
- mddev
->curr_resync_completed
||
8421 mddev
->curr_resync_completed
> mddev
->resync_max
8423 /* time to update curr_resync_completed */
8424 wait_event(mddev
->recovery_wait
,
8425 atomic_read(&mddev
->recovery_active
) == 0);
8426 mddev
->curr_resync_completed
= j
;
8427 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) &&
8428 j
> mddev
->recovery_cp
)
8429 mddev
->recovery_cp
= j
;
8430 update_time
= jiffies
;
8431 set_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
8432 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
8435 while (j
>= mddev
->resync_max
&&
8436 !test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
8437 /* As this condition is controlled by user-space,
8438 * we can block indefinitely, so use '_interruptible'
8439 * to avoid triggering warnings.
8441 flush_signals(current
); /* just in case */
8442 wait_event_interruptible(mddev
->recovery_wait
,
8443 mddev
->resync_max
> j
8444 || test_bit(MD_RECOVERY_INTR
,
8448 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
8451 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
);
8453 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8457 if (!skipped
) { /* actual IO requested */
8458 io_sectors
+= sectors
;
8459 atomic_add(sectors
, &mddev
->recovery_active
);
8462 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
8466 if (j
> max_sectors
)
8467 /* when skipping, extra large numbers can be returned. */
8470 mddev
->curr_resync
= j
;
8471 mddev
->curr_mark_cnt
= io_sectors
;
8472 if (last_check
== 0)
8473 /* this is the earliest that rebuild will be
8474 * visible in /proc/mdstat
8476 md_new_event(mddev
);
8478 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
8481 last_check
= io_sectors
;
8483 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
8485 int next
= (last_mark
+1) % SYNC_MARKS
;
8487 mddev
->resync_mark
= mark
[next
];
8488 mddev
->resync_mark_cnt
= mark_cnt
[next
];
8489 mark
[next
] = jiffies
;
8490 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
8494 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
8498 * this loop exits only if either when we are slower than
8499 * the 'hard' speed limit, or the system was IO-idle for
8501 * the system might be non-idle CPU-wise, but we only care
8502 * about not overloading the IO subsystem. (things like an
8503 * e2fsck being done on the RAID array should execute fast)
8507 recovery_done
= io_sectors
- atomic_read(&mddev
->recovery_active
);
8508 currspeed
= ((unsigned long)(recovery_done
- mddev
->resync_mark_cnt
))/2
8509 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
8511 if (currspeed
> speed_min(mddev
)) {
8512 if (currspeed
> speed_max(mddev
)) {
8516 if (!is_mddev_idle(mddev
, 0)) {
8518 * Give other IO more of a chance.
8519 * The faster the devices, the less we wait.
8521 wait_event(mddev
->recovery_wait
,
8522 !atomic_read(&mddev
->recovery_active
));
8526 pr_info("md: %s: %s %s.\n",mdname(mddev
), desc
,
8527 test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)
8528 ? "interrupted" : "done");
8530 * this also signals 'finished resyncing' to md_stop
8532 blk_finish_plug(&plug
);
8533 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
8535 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
8536 !test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
8537 mddev
->curr_resync
> 3) {
8538 mddev
->curr_resync_completed
= mddev
->curr_resync
;
8539 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
8541 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
);
8543 if (!test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
) &&
8544 mddev
->curr_resync
> 3) {
8545 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
8546 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
8547 if (mddev
->curr_resync
>= mddev
->recovery_cp
) {
8548 pr_debug("md: checkpointing %s of %s.\n",
8549 desc
, mdname(mddev
));
8550 if (test_bit(MD_RECOVERY_ERROR
,
8552 mddev
->recovery_cp
=
8553 mddev
->curr_resync_completed
;
8555 mddev
->recovery_cp
=
8559 mddev
->recovery_cp
= MaxSector
;
8561 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
8562 mddev
->curr_resync
= MaxSector
;
8563 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
8564 test_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
)) {
8566 rdev_for_each_rcu(rdev
, mddev
)
8567 if (rdev
->raid_disk
>= 0 &&
8568 mddev
->delta_disks
>= 0 &&
8569 !test_bit(Journal
, &rdev
->flags
) &&
8570 !test_bit(Faulty
, &rdev
->flags
) &&
8571 !test_bit(In_sync
, &rdev
->flags
) &&
8572 rdev
->recovery_offset
< mddev
->curr_resync
)
8573 rdev
->recovery_offset
= mddev
->curr_resync
;
8579 /* set CHANGE_PENDING here since maybe another update is needed,
8580 * so other nodes are informed. It should be harmless for normal
8582 set_mask_bits(&mddev
->sb_flags
, 0,
8583 BIT(MD_SB_CHANGE_PENDING
) | BIT(MD_SB_CHANGE_DEVS
));
8585 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
8586 !test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
8587 mddev
->delta_disks
> 0 &&
8588 mddev
->pers
->finish_reshape
&&
8589 mddev
->pers
->size
&&
8591 mddev_lock_nointr(mddev
);
8592 md_set_array_sectors(mddev
, mddev
->pers
->size(mddev
, 0, 0));
8593 mddev_unlock(mddev
);
8594 if (!mddev_is_clustered(mddev
)) {
8595 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
8596 revalidate_disk(mddev
->gendisk
);
8600 spin_lock(&mddev
->lock
);
8601 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
8602 /* We completed so min/max setting can be forgotten if used. */
8603 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
8604 mddev
->resync_min
= 0;
8605 mddev
->resync_max
= MaxSector
;
8606 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
8607 mddev
->resync_min
= mddev
->curr_resync_completed
;
8608 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
8609 mddev
->curr_resync
= 0;
8610 spin_unlock(&mddev
->lock
);
8612 wake_up(&resync_wait
);
8613 md_wakeup_thread(mddev
->thread
);
8616 EXPORT_SYMBOL_GPL(md_do_sync
);
8618 static int remove_and_add_spares(struct mddev
*mddev
,
8619 struct md_rdev
*this)
8621 struct md_rdev
*rdev
;
8624 bool remove_some
= false;
8626 if (this && test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
8627 /* Mustn't remove devices when resync thread is running */
8630 rdev_for_each(rdev
, mddev
) {
8631 if ((this == NULL
|| rdev
== this) &&
8632 rdev
->raid_disk
>= 0 &&
8633 !test_bit(Blocked
, &rdev
->flags
) &&
8634 test_bit(Faulty
, &rdev
->flags
) &&
8635 atomic_read(&rdev
->nr_pending
)==0) {
8636 /* Faulty non-Blocked devices with nr_pending == 0
8637 * never get nr_pending incremented,
8638 * never get Faulty cleared, and never get Blocked set.
8639 * So we can synchronize_rcu now rather than once per device
8642 set_bit(RemoveSynchronized
, &rdev
->flags
);
8648 rdev_for_each(rdev
, mddev
) {
8649 if ((this == NULL
|| rdev
== this) &&
8650 rdev
->raid_disk
>= 0 &&
8651 !test_bit(Blocked
, &rdev
->flags
) &&
8652 ((test_bit(RemoveSynchronized
, &rdev
->flags
) ||
8653 (!test_bit(In_sync
, &rdev
->flags
) &&
8654 !test_bit(Journal
, &rdev
->flags
))) &&
8655 atomic_read(&rdev
->nr_pending
)==0)) {
8656 if (mddev
->pers
->hot_remove_disk(
8657 mddev
, rdev
) == 0) {
8658 sysfs_unlink_rdev(mddev
, rdev
);
8659 rdev
->saved_raid_disk
= rdev
->raid_disk
;
8660 rdev
->raid_disk
= -1;
8664 if (remove_some
&& test_bit(RemoveSynchronized
, &rdev
->flags
))
8665 clear_bit(RemoveSynchronized
, &rdev
->flags
);
8668 if (removed
&& mddev
->kobj
.sd
)
8669 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
8671 if (this && removed
)
8674 rdev_for_each(rdev
, mddev
) {
8675 if (this && this != rdev
)
8677 if (test_bit(Candidate
, &rdev
->flags
))
8679 if (rdev
->raid_disk
>= 0 &&
8680 !test_bit(In_sync
, &rdev
->flags
) &&
8681 !test_bit(Journal
, &rdev
->flags
) &&
8682 !test_bit(Faulty
, &rdev
->flags
))
8684 if (rdev
->raid_disk
>= 0)
8686 if (test_bit(Faulty
, &rdev
->flags
))
8688 if (!test_bit(Journal
, &rdev
->flags
)) {
8690 ! (rdev
->saved_raid_disk
>= 0 &&
8691 !test_bit(Bitmap_sync
, &rdev
->flags
)))
8694 rdev
->recovery_offset
= 0;
8697 hot_add_disk(mddev
, rdev
) == 0) {
8698 if (sysfs_link_rdev(mddev
, rdev
))
8699 /* failure here is OK */;
8700 if (!test_bit(Journal
, &rdev
->flags
))
8702 md_new_event(mddev
);
8703 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
8708 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
8712 static void md_start_sync(struct work_struct
*ws
)
8714 struct mddev
*mddev
= container_of(ws
, struct mddev
, del_work
);
8716 mddev
->sync_thread
= md_register_thread(md_do_sync
,
8719 if (!mddev
->sync_thread
) {
8720 pr_warn("%s: could not start resync thread...\n",
8722 /* leave the spares where they are, it shouldn't hurt */
8723 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8724 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
8725 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
8726 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
8727 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8728 wake_up(&resync_wait
);
8729 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
8731 if (mddev
->sysfs_action
)
8732 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
8734 md_wakeup_thread(mddev
->sync_thread
);
8735 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
8736 md_new_event(mddev
);
8740 * This routine is regularly called by all per-raid-array threads to
8741 * deal with generic issues like resync and super-block update.
8742 * Raid personalities that don't have a thread (linear/raid0) do not
8743 * need this as they never do any recovery or update the superblock.
8745 * It does not do any resync itself, but rather "forks" off other threads
8746 * to do that as needed.
8747 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
8748 * "->recovery" and create a thread at ->sync_thread.
8749 * When the thread finishes it sets MD_RECOVERY_DONE
8750 * and wakeups up this thread which will reap the thread and finish up.
8751 * This thread also removes any faulty devices (with nr_pending == 0).
8753 * The overall approach is:
8754 * 1/ if the superblock needs updating, update it.
8755 * 2/ If a recovery thread is running, don't do anything else.
8756 * 3/ If recovery has finished, clean up, possibly marking spares active.
8757 * 4/ If there are any faulty devices, remove them.
8758 * 5/ If array is degraded, try to add spares devices
8759 * 6/ If array has spares or is not in-sync, start a resync thread.
8761 void md_check_recovery(struct mddev
*mddev
)
8763 if (test_bit(MD_ALLOW_SB_UPDATE
, &mddev
->flags
) && mddev
->sb_flags
) {
8764 /* Write superblock - thread that called mddev_suspend()
8765 * holds reconfig_mutex for us.
8767 set_bit(MD_UPDATING_SB
, &mddev
->flags
);
8768 smp_mb__after_atomic();
8769 if (test_bit(MD_ALLOW_SB_UPDATE
, &mddev
->flags
))
8770 md_update_sb(mddev
, 0);
8771 clear_bit_unlock(MD_UPDATING_SB
, &mddev
->flags
);
8772 wake_up(&mddev
->sb_wait
);
8775 if (mddev
->suspended
)
8779 md_bitmap_daemon_work(mddev
);
8781 if (signal_pending(current
)) {
8782 if (mddev
->pers
->sync_request
&& !mddev
->external
) {
8783 pr_debug("md: %s in immediate safe mode\n",
8785 mddev
->safemode
= 2;
8787 flush_signals(current
);
8790 if (mddev
->ro
&& !test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
8793 (mddev
->sb_flags
& ~ (1<<MD_SB_CHANGE_PENDING
)) ||
8794 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
8795 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
8796 (mddev
->external
== 0 && mddev
->safemode
== 1) ||
8797 (mddev
->safemode
== 2
8798 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
8802 if (mddev_trylock(mddev
)) {
8805 if (!mddev
->external
&& mddev
->safemode
== 1)
8806 mddev
->safemode
= 0;
8809 struct md_rdev
*rdev
;
8810 if (!mddev
->external
&& mddev
->in_sync
)
8811 /* 'Blocked' flag not needed as failed devices
8812 * will be recorded if array switched to read/write.
8813 * Leaving it set will prevent the device
8814 * from being removed.
8816 rdev_for_each(rdev
, mddev
)
8817 clear_bit(Blocked
, &rdev
->flags
);
8818 /* On a read-only array we can:
8819 * - remove failed devices
8820 * - add already-in_sync devices if the array itself
8822 * As we only add devices that are already in-sync,
8823 * we can activate the spares immediately.
8825 remove_and_add_spares(mddev
, NULL
);
8826 /* There is no thread, but we need to call
8827 * ->spare_active and clear saved_raid_disk
8829 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8830 md_reap_sync_thread(mddev
);
8831 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8832 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
8833 clear_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
8837 if (mddev_is_clustered(mddev
)) {
8838 struct md_rdev
*rdev
;
8839 /* kick the device if another node issued a
8842 rdev_for_each(rdev
, mddev
) {
8843 if (test_and_clear_bit(ClusterRemove
, &rdev
->flags
) &&
8844 rdev
->raid_disk
< 0)
8845 md_kick_rdev_from_array(rdev
);
8849 if (!mddev
->external
&& !mddev
->in_sync
) {
8850 spin_lock(&mddev
->lock
);
8852 spin_unlock(&mddev
->lock
);
8855 if (mddev
->sb_flags
)
8856 md_update_sb(mddev
, 0);
8858 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
8859 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
8860 /* resync/recovery still happening */
8861 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
8864 if (mddev
->sync_thread
) {
8865 md_reap_sync_thread(mddev
);
8868 /* Set RUNNING before clearing NEEDED to avoid
8869 * any transients in the value of "sync_action".
8871 mddev
->curr_resync_completed
= 0;
8872 spin_lock(&mddev
->lock
);
8873 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8874 spin_unlock(&mddev
->lock
);
8875 /* Clear some bits that don't mean anything, but
8878 clear_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8879 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
8881 if (!test_and_clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
8882 test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
8884 /* no recovery is running.
8885 * remove any failed drives, then
8886 * add spares if possible.
8887 * Spares are also removed and re-added, to allow
8888 * the personality to fail the re-add.
8891 if (mddev
->reshape_position
!= MaxSector
) {
8892 if (mddev
->pers
->check_reshape
== NULL
||
8893 mddev
->pers
->check_reshape(mddev
) != 0)
8894 /* Cannot proceed */
8896 set_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
8897 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8898 } else if ((spares
= remove_and_add_spares(mddev
, NULL
))) {
8899 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8900 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
8901 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
8902 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8903 } else if (mddev
->recovery_cp
< MaxSector
) {
8904 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8905 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8906 } else if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
8907 /* nothing to be done ... */
8910 if (mddev
->pers
->sync_request
) {
8912 /* We are adding a device or devices to an array
8913 * which has the bitmap stored on all devices.
8914 * So make sure all bitmap pages get written
8916 md_bitmap_write_all(mddev
->bitmap
);
8918 INIT_WORK(&mddev
->del_work
, md_start_sync
);
8919 queue_work(md_misc_wq
, &mddev
->del_work
);
8923 if (!mddev
->sync_thread
) {
8924 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8925 wake_up(&resync_wait
);
8926 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
8928 if (mddev
->sysfs_action
)
8929 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
8932 wake_up(&mddev
->sb_wait
);
8933 mddev_unlock(mddev
);
8936 EXPORT_SYMBOL(md_check_recovery
);
8938 void md_reap_sync_thread(struct mddev
*mddev
)
8940 struct md_rdev
*rdev
;
8941 sector_t old_dev_sectors
= mddev
->dev_sectors
;
8942 bool is_reshaped
= false;
8944 /* resync has finished, collect result */
8945 md_unregister_thread(&mddev
->sync_thread
);
8946 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
8947 !test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
8949 /* activate any spares */
8950 if (mddev
->pers
->spare_active(mddev
)) {
8951 sysfs_notify(&mddev
->kobj
, NULL
,
8953 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
8956 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
8957 mddev
->pers
->finish_reshape
) {
8958 mddev
->pers
->finish_reshape(mddev
);
8959 if (mddev_is_clustered(mddev
))
8963 /* If array is no-longer degraded, then any saved_raid_disk
8964 * information must be scrapped.
8966 if (!mddev
->degraded
)
8967 rdev_for_each(rdev
, mddev
)
8968 rdev
->saved_raid_disk
= -1;
8970 md_update_sb(mddev
, 1);
8971 /* MD_SB_CHANGE_PENDING should be cleared by md_update_sb, so we can
8972 * call resync_finish here if MD_CLUSTER_RESYNC_LOCKED is set by
8974 if (test_and_clear_bit(MD_CLUSTER_RESYNC_LOCKED
, &mddev
->flags
))
8975 md_cluster_ops
->resync_finish(mddev
);
8976 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8977 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
8978 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8979 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
8980 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
8981 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
8983 * We call md_cluster_ops->update_size here because sync_size could
8984 * be changed by md_update_sb, and MD_RECOVERY_RESHAPE is cleared,
8985 * so it is time to update size across cluster.
8987 if (mddev_is_clustered(mddev
) && is_reshaped
8988 && !test_bit(MD_CLOSING
, &mddev
->flags
))
8989 md_cluster_ops
->update_size(mddev
, old_dev_sectors
);
8990 wake_up(&resync_wait
);
8991 /* flag recovery needed just to double check */
8992 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
8993 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
8994 md_new_event(mddev
);
8995 if (mddev
->event_work
.func
)
8996 queue_work(md_misc_wq
, &mddev
->event_work
);
8998 EXPORT_SYMBOL(md_reap_sync_thread
);
9000 void md_wait_for_blocked_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
9002 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
9003 wait_event_timeout(rdev
->blocked_wait
,
9004 !test_bit(Blocked
, &rdev
->flags
) &&
9005 !test_bit(BlockedBadBlocks
, &rdev
->flags
),
9006 msecs_to_jiffies(5000));
9007 rdev_dec_pending(rdev
, mddev
);
9009 EXPORT_SYMBOL(md_wait_for_blocked_rdev
);
9011 void md_finish_reshape(struct mddev
*mddev
)
9013 /* called be personality module when reshape completes. */
9014 struct md_rdev
*rdev
;
9016 rdev_for_each(rdev
, mddev
) {
9017 if (rdev
->data_offset
> rdev
->new_data_offset
)
9018 rdev
->sectors
+= rdev
->data_offset
- rdev
->new_data_offset
;
9020 rdev
->sectors
-= rdev
->new_data_offset
- rdev
->data_offset
;
9021 rdev
->data_offset
= rdev
->new_data_offset
;
9024 EXPORT_SYMBOL(md_finish_reshape
);
9026 /* Bad block management */
9028 /* Returns 1 on success, 0 on failure */
9029 int rdev_set_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
9032 struct mddev
*mddev
= rdev
->mddev
;
9035 s
+= rdev
->new_data_offset
;
9037 s
+= rdev
->data_offset
;
9038 rv
= badblocks_set(&rdev
->badblocks
, s
, sectors
, 0);
9040 /* Make sure they get written out promptly */
9041 if (test_bit(ExternalBbl
, &rdev
->flags
))
9042 sysfs_notify(&rdev
->kobj
, NULL
,
9043 "unacknowledged_bad_blocks");
9044 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
9045 set_mask_bits(&mddev
->sb_flags
, 0,
9046 BIT(MD_SB_CHANGE_CLEAN
) | BIT(MD_SB_CHANGE_PENDING
));
9047 md_wakeup_thread(rdev
->mddev
->thread
);
9052 EXPORT_SYMBOL_GPL(rdev_set_badblocks
);
9054 int rdev_clear_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
9059 s
+= rdev
->new_data_offset
;
9061 s
+= rdev
->data_offset
;
9062 rv
= badblocks_clear(&rdev
->badblocks
, s
, sectors
);
9063 if ((rv
== 0) && test_bit(ExternalBbl
, &rdev
->flags
))
9064 sysfs_notify(&rdev
->kobj
, NULL
, "bad_blocks");
9067 EXPORT_SYMBOL_GPL(rdev_clear_badblocks
);
9069 static int md_notify_reboot(struct notifier_block
*this,
9070 unsigned long code
, void *x
)
9072 struct list_head
*tmp
;
9073 struct mddev
*mddev
;
9076 for_each_mddev(mddev
, tmp
) {
9077 if (mddev_trylock(mddev
)) {
9079 __md_stop_writes(mddev
);
9080 if (mddev
->persistent
)
9081 mddev
->safemode
= 2;
9082 mddev_unlock(mddev
);
9087 * certain more exotic SCSI devices are known to be
9088 * volatile wrt too early system reboots. While the
9089 * right place to handle this issue is the given
9090 * driver, we do want to have a safe RAID driver ...
9098 static struct notifier_block md_notifier
= {
9099 .notifier_call
= md_notify_reboot
,
9101 .priority
= INT_MAX
, /* before any real devices */
9104 static void md_geninit(void)
9106 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
9108 proc_create("mdstat", S_IRUGO
, NULL
, &md_seq_fops
);
9111 static int __init
md_init(void)
9115 md_wq
= alloc_workqueue("md", WQ_MEM_RECLAIM
, 0);
9119 md_misc_wq
= alloc_workqueue("md_misc", 0, 0);
9123 if ((ret
= register_blkdev(MD_MAJOR
, "md")) < 0)
9126 if ((ret
= register_blkdev(0, "mdp")) < 0)
9130 blk_register_region(MKDEV(MD_MAJOR
, 0), 512, THIS_MODULE
,
9131 md_probe
, NULL
, NULL
);
9132 blk_register_region(MKDEV(mdp_major
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
9133 md_probe
, NULL
, NULL
);
9135 register_reboot_notifier(&md_notifier
);
9136 raid_table_header
= register_sysctl_table(raid_root_table
);
9142 unregister_blkdev(MD_MAJOR
, "md");
9144 destroy_workqueue(md_misc_wq
);
9146 destroy_workqueue(md_wq
);
9151 static void check_sb_changes(struct mddev
*mddev
, struct md_rdev
*rdev
)
9153 struct mdp_superblock_1
*sb
= page_address(rdev
->sb_page
);
9154 struct md_rdev
*rdev2
;
9156 char b
[BDEVNAME_SIZE
];
9159 * If size is changed in another node then we need to
9160 * do resize as well.
9162 if (mddev
->dev_sectors
!= le64_to_cpu(sb
->size
)) {
9163 ret
= mddev
->pers
->resize(mddev
, le64_to_cpu(sb
->size
));
9165 pr_info("md-cluster: resize failed\n");
9167 md_bitmap_update_sb(mddev
->bitmap
);
9170 /* Check for change of roles in the active devices */
9171 rdev_for_each(rdev2
, mddev
) {
9172 if (test_bit(Faulty
, &rdev2
->flags
))
9175 /* Check if the roles changed */
9176 role
= le16_to_cpu(sb
->dev_roles
[rdev2
->desc_nr
]);
9178 if (test_bit(Candidate
, &rdev2
->flags
)) {
9179 if (role
== 0xfffe) {
9180 pr_info("md: Removing Candidate device %s because add failed\n", bdevname(rdev2
->bdev
,b
));
9181 md_kick_rdev_from_array(rdev2
);
9185 clear_bit(Candidate
, &rdev2
->flags
);
9188 if (role
!= rdev2
->raid_disk
) {
9190 * got activated except reshape is happening.
9192 if (rdev2
->raid_disk
== -1 && role
!= 0xffff &&
9193 !(le32_to_cpu(sb
->feature_map
) &
9194 MD_FEATURE_RESHAPE_ACTIVE
)) {
9195 rdev2
->saved_raid_disk
= role
;
9196 ret
= remove_and_add_spares(mddev
, rdev2
);
9197 pr_info("Activated spare: %s\n",
9198 bdevname(rdev2
->bdev
,b
));
9199 /* wakeup mddev->thread here, so array could
9200 * perform resync with the new activated disk */
9201 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
9202 md_wakeup_thread(mddev
->thread
);
9206 * We just want to do the minimum to mark the disk
9207 * as faulty. The recovery is performed by the
9208 * one who initiated the error.
9210 if ((role
== 0xfffe) || (role
== 0xfffd)) {
9211 md_error(mddev
, rdev2
);
9212 clear_bit(Blocked
, &rdev2
->flags
);
9217 if (mddev
->raid_disks
!= le32_to_cpu(sb
->raid_disks
))
9218 update_raid_disks(mddev
, le32_to_cpu(sb
->raid_disks
));
9221 * Since mddev->delta_disks has already updated in update_raid_disks,
9222 * so it is time to check reshape.
9224 if (test_bit(MD_RESYNCING_REMOTE
, &mddev
->recovery
) &&
9225 (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
9227 * reshape is happening in the remote node, we need to
9228 * update reshape_position and call start_reshape.
9230 mddev
->reshape_position
= le64_to_cpu(sb
->reshape_position
);
9231 if (mddev
->pers
->update_reshape_pos
)
9232 mddev
->pers
->update_reshape_pos(mddev
);
9233 if (mddev
->pers
->start_reshape
)
9234 mddev
->pers
->start_reshape(mddev
);
9235 } else if (test_bit(MD_RESYNCING_REMOTE
, &mddev
->recovery
) &&
9236 mddev
->reshape_position
!= MaxSector
&&
9237 !(le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
9238 /* reshape is just done in another node. */
9239 mddev
->reshape_position
= MaxSector
;
9240 if (mddev
->pers
->update_reshape_pos
)
9241 mddev
->pers
->update_reshape_pos(mddev
);
9244 /* Finally set the event to be up to date */
9245 mddev
->events
= le64_to_cpu(sb
->events
);
9248 static int read_rdev(struct mddev
*mddev
, struct md_rdev
*rdev
)
9251 struct page
*swapout
= rdev
->sb_page
;
9252 struct mdp_superblock_1
*sb
;
9254 /* Store the sb page of the rdev in the swapout temporary
9255 * variable in case we err in the future
9257 rdev
->sb_page
= NULL
;
9258 err
= alloc_disk_sb(rdev
);
9260 ClearPageUptodate(rdev
->sb_page
);
9261 rdev
->sb_loaded
= 0;
9262 err
= super_types
[mddev
->major_version
].
9263 load_super(rdev
, NULL
, mddev
->minor_version
);
9266 pr_warn("%s: %d Could not reload rdev(%d) err: %d. Restoring old values\n",
9267 __func__
, __LINE__
, rdev
->desc_nr
, err
);
9269 put_page(rdev
->sb_page
);
9270 rdev
->sb_page
= swapout
;
9271 rdev
->sb_loaded
= 1;
9275 sb
= page_address(rdev
->sb_page
);
9276 /* Read the offset unconditionally, even if MD_FEATURE_RECOVERY_OFFSET
9280 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RECOVERY_OFFSET
))
9281 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
9283 /* The other node finished recovery, call spare_active to set
9284 * device In_sync and mddev->degraded
9286 if (rdev
->recovery_offset
== MaxSector
&&
9287 !test_bit(In_sync
, &rdev
->flags
) &&
9288 mddev
->pers
->spare_active(mddev
))
9289 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
9295 void md_reload_sb(struct mddev
*mddev
, int nr
)
9297 struct md_rdev
*rdev
;
9301 rdev_for_each_rcu(rdev
, mddev
) {
9302 if (rdev
->desc_nr
== nr
)
9306 if (!rdev
|| rdev
->desc_nr
!= nr
) {
9307 pr_warn("%s: %d Could not find rdev with nr %d\n", __func__
, __LINE__
, nr
);
9311 err
= read_rdev(mddev
, rdev
);
9315 check_sb_changes(mddev
, rdev
);
9317 /* Read all rdev's to update recovery_offset */
9318 rdev_for_each_rcu(rdev
, mddev
) {
9319 if (!test_bit(Faulty
, &rdev
->flags
))
9320 read_rdev(mddev
, rdev
);
9323 EXPORT_SYMBOL(md_reload_sb
);
9328 * Searches all registered partitions for autorun RAID arrays
9332 static DEFINE_MUTEX(detected_devices_mutex
);
9333 static LIST_HEAD(all_detected_devices
);
9334 struct detected_devices_node
{
9335 struct list_head list
;
9339 void md_autodetect_dev(dev_t dev
)
9341 struct detected_devices_node
*node_detected_dev
;
9343 node_detected_dev
= kzalloc(sizeof(*node_detected_dev
), GFP_KERNEL
);
9344 if (node_detected_dev
) {
9345 node_detected_dev
->dev
= dev
;
9346 mutex_lock(&detected_devices_mutex
);
9347 list_add_tail(&node_detected_dev
->list
, &all_detected_devices
);
9348 mutex_unlock(&detected_devices_mutex
);
9352 static void autostart_arrays(int part
)
9354 struct md_rdev
*rdev
;
9355 struct detected_devices_node
*node_detected_dev
;
9357 int i_scanned
, i_passed
;
9362 pr_info("md: Autodetecting RAID arrays.\n");
9364 mutex_lock(&detected_devices_mutex
);
9365 while (!list_empty(&all_detected_devices
) && i_scanned
< INT_MAX
) {
9367 node_detected_dev
= list_entry(all_detected_devices
.next
,
9368 struct detected_devices_node
, list
);
9369 list_del(&node_detected_dev
->list
);
9370 dev
= node_detected_dev
->dev
;
9371 kfree(node_detected_dev
);
9372 mutex_unlock(&detected_devices_mutex
);
9373 rdev
= md_import_device(dev
,0, 90);
9374 mutex_lock(&detected_devices_mutex
);
9378 if (test_bit(Faulty
, &rdev
->flags
))
9381 set_bit(AutoDetected
, &rdev
->flags
);
9382 list_add(&rdev
->same_set
, &pending_raid_disks
);
9385 mutex_unlock(&detected_devices_mutex
);
9387 pr_debug("md: Scanned %d and added %d devices.\n", i_scanned
, i_passed
);
9389 autorun_devices(part
);
9392 #endif /* !MODULE */
9394 static __exit
void md_exit(void)
9396 struct mddev
*mddev
;
9397 struct list_head
*tmp
;
9400 blk_unregister_region(MKDEV(MD_MAJOR
,0), 512);
9401 blk_unregister_region(MKDEV(mdp_major
,0), 1U << MINORBITS
);
9403 unregister_blkdev(MD_MAJOR
,"md");
9404 unregister_blkdev(mdp_major
, "mdp");
9405 unregister_reboot_notifier(&md_notifier
);
9406 unregister_sysctl_table(raid_table_header
);
9408 /* We cannot unload the modules while some process is
9409 * waiting for us in select() or poll() - wake them up
9412 while (waitqueue_active(&md_event_waiters
)) {
9413 /* not safe to leave yet */
9414 wake_up(&md_event_waiters
);
9418 remove_proc_entry("mdstat", NULL
);
9420 for_each_mddev(mddev
, tmp
) {
9421 export_array(mddev
);
9423 mddev
->hold_active
= 0;
9425 * for_each_mddev() will call mddev_put() at the end of each
9426 * iteration. As the mddev is now fully clear, this will
9427 * schedule the mddev for destruction by a workqueue, and the
9428 * destroy_workqueue() below will wait for that to complete.
9431 destroy_workqueue(md_misc_wq
);
9432 destroy_workqueue(md_wq
);
9435 subsys_initcall(md_init
);
9436 module_exit(md_exit
)
9438 static int get_ro(char *buffer
, const struct kernel_param
*kp
)
9440 return sprintf(buffer
, "%d", start_readonly
);
9442 static int set_ro(const char *val
, const struct kernel_param
*kp
)
9444 return kstrtouint(val
, 10, (unsigned int *)&start_readonly
);
9447 module_param_call(start_ro
, set_ro
, get_ro
, NULL
, S_IRUSR
|S_IWUSR
);
9448 module_param(start_dirty_degraded
, int, S_IRUGO
|S_IWUSR
);
9449 module_param_call(new_array
, add_named_array
, NULL
, NULL
, S_IWUSR
);
9450 module_param(create_on_open
, bool, S_IRUSR
|S_IWUSR
);
9452 MODULE_LICENSE("GPL");
9453 MODULE_DESCRIPTION("MD RAID framework");
9455 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);