2 md.c : Multiple Devices driver for Linux
3 Copyright (C) 1998, 1999, 2000 Ingo Molnar
5 completely rewritten, based on the MD driver code from Marc Zyngier
9 - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar
10 - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com>
11 - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net>
12 - kerneld support by Boris Tobotras <boris@xtalk.msk.su>
13 - kmod support by: Cyrus Durgin
14 - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com>
15 - Devfs support by Richard Gooch <rgooch@atnf.csiro.au>
17 - lots of fixes and improvements to the RAID1/RAID5 and generic
18 RAID code (such as request based resynchronization):
20 Neil Brown <neilb@cse.unsw.edu.au>.
22 - persistent bitmap code
23 Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.
25 This program is free software; you can redistribute it and/or modify
26 it under the terms of the GNU General Public License as published by
27 the Free Software Foundation; either version 2, or (at your option)
30 You should have received a copy of the GNU General Public License
31 (for example /usr/src/linux/COPYING); if not, write to the Free
32 Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
34 Errors, Warnings, etc.
36 pr_crit() for error conditions that risk data loss
37 pr_err() for error conditions that are unexpected, like an IO error
38 or internal inconsistency
39 pr_warn() for error conditions that could have been predicated, like
40 adding a device to an array when it has incompatible metadata
41 pr_info() for every interesting, very rare events, like an array starting
42 or stopping, or resync starting or stopping
43 pr_debug() for everything else.
47 #include <linux/sched/signal.h>
48 #include <linux/kthread.h>
49 #include <linux/blkdev.h>
50 #include <linux/badblocks.h>
51 #include <linux/sysctl.h>
52 #include <linux/seq_file.h>
54 #include <linux/poll.h>
55 #include <linux/ctype.h>
56 #include <linux/string.h>
57 #include <linux/hdreg.h>
58 #include <linux/proc_fs.h>
59 #include <linux/random.h>
60 #include <linux/module.h>
61 #include <linux/reboot.h>
62 #include <linux/file.h>
63 #include <linux/compat.h>
64 #include <linux/delay.h>
65 #include <linux/raid/md_p.h>
66 #include <linux/raid/md_u.h>
67 #include <linux/slab.h>
68 #include <linux/percpu-refcount.h>
70 #include <trace/events/block.h>
72 #include "md-bitmap.h"
73 #include "md-cluster.h"
76 static void autostart_arrays(int part
);
79 /* pers_list is a list of registered personalities protected
81 * pers_lock does extra service to protect accesses to
82 * mddev->thread when the mutex cannot be held.
84 static LIST_HEAD(pers_list
);
85 static DEFINE_SPINLOCK(pers_lock
);
87 struct md_cluster_operations
*md_cluster_ops
;
88 EXPORT_SYMBOL(md_cluster_ops
);
89 struct module
*md_cluster_mod
;
90 EXPORT_SYMBOL(md_cluster_mod
);
92 static DECLARE_WAIT_QUEUE_HEAD(resync_wait
);
93 static struct workqueue_struct
*md_wq
;
94 static struct workqueue_struct
*md_misc_wq
;
96 static int remove_and_add_spares(struct mddev
*mddev
,
97 struct md_rdev
*this);
98 static void mddev_detach(struct mddev
*mddev
);
101 * Default number of read corrections we'll attempt on an rdev
102 * before ejecting it from the array. We divide the read error
103 * count by 2 for every hour elapsed between read errors.
105 #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
107 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
108 * is 1000 KB/sec, so the extra system load does not show up that much.
109 * Increase it if you want to have more _guaranteed_ speed. Note that
110 * the RAID driver will use the maximum available bandwidth if the IO
111 * subsystem is idle. There is also an 'absolute maximum' reconstruction
112 * speed limit - in case reconstruction slows down your system despite
115 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
116 * or /sys/block/mdX/md/sync_speed_{min,max}
119 static int sysctl_speed_limit_min
= 1000;
120 static int sysctl_speed_limit_max
= 200000;
121 static inline int speed_min(struct mddev
*mddev
)
123 return mddev
->sync_speed_min
?
124 mddev
->sync_speed_min
: sysctl_speed_limit_min
;
127 static inline int speed_max(struct mddev
*mddev
)
129 return mddev
->sync_speed_max
?
130 mddev
->sync_speed_max
: sysctl_speed_limit_max
;
133 static struct ctl_table_header
*raid_table_header
;
135 static struct ctl_table raid_table
[] = {
137 .procname
= "speed_limit_min",
138 .data
= &sysctl_speed_limit_min
,
139 .maxlen
= sizeof(int),
140 .mode
= S_IRUGO
|S_IWUSR
,
141 .proc_handler
= proc_dointvec
,
144 .procname
= "speed_limit_max",
145 .data
= &sysctl_speed_limit_max
,
146 .maxlen
= sizeof(int),
147 .mode
= S_IRUGO
|S_IWUSR
,
148 .proc_handler
= proc_dointvec
,
153 static struct ctl_table raid_dir_table
[] = {
157 .mode
= S_IRUGO
|S_IXUGO
,
163 static struct ctl_table raid_root_table
[] = {
168 .child
= raid_dir_table
,
173 static const struct block_device_operations md_fops
;
175 static int start_readonly
;
178 * The original mechanism for creating an md device is to create
179 * a device node in /dev and to open it. This causes races with device-close.
180 * The preferred method is to write to the "new_array" module parameter.
181 * This can avoid races.
182 * Setting create_on_open to false disables the original mechanism
183 * so all the races disappear.
185 static bool create_on_open
= true;
188 * like bio_clone_bioset, but with a local bio set
191 struct bio
*bio_alloc_mddev(gfp_t gfp_mask
, int nr_iovecs
,
196 if (!mddev
|| !mddev
->bio_set
)
197 return bio_alloc(gfp_mask
, nr_iovecs
);
199 b
= bio_alloc_bioset(gfp_mask
, nr_iovecs
, mddev
->bio_set
);
204 EXPORT_SYMBOL_GPL(bio_alloc_mddev
);
206 static struct bio
*md_bio_alloc_sync(struct mddev
*mddev
)
208 if (!mddev
|| !mddev
->sync_set
)
209 return bio_alloc(GFP_NOIO
, 1);
211 return bio_alloc_bioset(GFP_NOIO
, 1, mddev
->sync_set
);
215 * We have a system wide 'event count' that is incremented
216 * on any 'interesting' event, and readers of /proc/mdstat
217 * can use 'poll' or 'select' to find out when the event
221 * start array, stop array, error, add device, remove device,
222 * start build, activate spare
224 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters
);
225 static atomic_t md_event_count
;
226 void md_new_event(struct mddev
*mddev
)
228 atomic_inc(&md_event_count
);
229 wake_up(&md_event_waiters
);
231 EXPORT_SYMBOL_GPL(md_new_event
);
234 * Enables to iterate over all existing md arrays
235 * all_mddevs_lock protects this list.
237 static LIST_HEAD(all_mddevs
);
238 static DEFINE_SPINLOCK(all_mddevs_lock
);
241 * iterates through all used mddevs in the system.
242 * We take care to grab the all_mddevs_lock whenever navigating
243 * the list, and to always hold a refcount when unlocked.
244 * Any code which breaks out of this loop while own
245 * a reference to the current mddev and must mddev_put it.
247 #define for_each_mddev(_mddev,_tmp) \
249 for (({ spin_lock(&all_mddevs_lock); \
250 _tmp = all_mddevs.next; \
252 ({ if (_tmp != &all_mddevs) \
253 mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\
254 spin_unlock(&all_mddevs_lock); \
255 if (_mddev) mddev_put(_mddev); \
256 _mddev = list_entry(_tmp, struct mddev, all_mddevs); \
257 _tmp != &all_mddevs;}); \
258 ({ spin_lock(&all_mddevs_lock); \
259 _tmp = _tmp->next;}) \
262 /* Rather than calling directly into the personality make_request function,
263 * IO requests come here first so that we can check if the device is
264 * being suspended pending a reconfiguration.
265 * We hold a refcount over the call to ->make_request. By the time that
266 * call has finished, the bio has been linked into some internal structure
267 * and so is visible to ->quiesce(), so we don't need the refcount any more.
269 static bool is_suspended(struct mddev
*mddev
, struct bio
*bio
)
271 if (mddev
->suspended
)
273 if (bio_data_dir(bio
) != WRITE
)
275 if (mddev
->suspend_lo
>= mddev
->suspend_hi
)
277 if (bio
->bi_iter
.bi_sector
>= mddev
->suspend_hi
)
279 if (bio_end_sector(bio
) < mddev
->suspend_lo
)
284 void md_handle_request(struct mddev
*mddev
, struct bio
*bio
)
288 if (is_suspended(mddev
, bio
)) {
291 prepare_to_wait(&mddev
->sb_wait
, &__wait
,
292 TASK_UNINTERRUPTIBLE
);
293 if (!is_suspended(mddev
, bio
))
299 finish_wait(&mddev
->sb_wait
, &__wait
);
301 atomic_inc(&mddev
->active_io
);
304 if (!mddev
->pers
->make_request(mddev
, bio
)) {
305 atomic_dec(&mddev
->active_io
);
306 wake_up(&mddev
->sb_wait
);
307 goto check_suspended
;
310 if (atomic_dec_and_test(&mddev
->active_io
) && mddev
->suspended
)
311 wake_up(&mddev
->sb_wait
);
313 EXPORT_SYMBOL(md_handle_request
);
315 static blk_qc_t
md_make_request(struct request_queue
*q
, struct bio
*bio
)
317 const int rw
= bio_data_dir(bio
);
318 struct mddev
*mddev
= q
->queuedata
;
319 unsigned int sectors
;
322 if (unlikely(test_bit(MD_BROKEN
, &mddev
->flags
)) && (rw
== WRITE
)) {
324 return BLK_QC_T_NONE
;
327 blk_queue_split(q
, &bio
);
329 if (mddev
== NULL
|| mddev
->pers
== NULL
) {
331 return BLK_QC_T_NONE
;
333 if (mddev
->ro
== 1 && unlikely(rw
== WRITE
)) {
334 if (bio_sectors(bio
) != 0)
335 bio
->bi_status
= BLK_STS_IOERR
;
337 return BLK_QC_T_NONE
;
341 * save the sectors now since our bio can
342 * go away inside make_request
344 sectors
= bio_sectors(bio
);
345 /* bio could be mergeable after passing to underlayer */
346 bio
->bi_opf
&= ~REQ_NOMERGE
;
348 md_handle_request(mddev
, bio
);
350 cpu
= part_stat_lock();
351 part_stat_inc(cpu
, &mddev
->gendisk
->part0
, ios
[rw
]);
352 part_stat_add(cpu
, &mddev
->gendisk
->part0
, sectors
[rw
], sectors
);
355 return BLK_QC_T_NONE
;
358 /* mddev_suspend makes sure no new requests are submitted
359 * to the device, and that any requests that have been submitted
360 * are completely handled.
361 * Once mddev_detach() is called and completes, the module will be
364 void mddev_suspend(struct mddev
*mddev
)
366 WARN_ON_ONCE(mddev
->thread
&& current
== mddev
->thread
->tsk
);
367 lockdep_assert_held(&mddev
->reconfig_mutex
);
368 if (mddev
->suspended
++)
371 wake_up(&mddev
->sb_wait
);
372 set_bit(MD_ALLOW_SB_UPDATE
, &mddev
->flags
);
373 smp_mb__after_atomic();
374 wait_event(mddev
->sb_wait
, atomic_read(&mddev
->active_io
) == 0);
375 mddev
->pers
->quiesce(mddev
, 1);
376 clear_bit_unlock(MD_ALLOW_SB_UPDATE
, &mddev
->flags
);
377 wait_event(mddev
->sb_wait
, !test_bit(MD_UPDATING_SB
, &mddev
->flags
));
379 del_timer_sync(&mddev
->safemode_timer
);
381 EXPORT_SYMBOL_GPL(mddev_suspend
);
383 void mddev_resume(struct mddev
*mddev
)
385 lockdep_assert_held(&mddev
->reconfig_mutex
);
386 if (--mddev
->suspended
)
388 wake_up(&mddev
->sb_wait
);
389 mddev
->pers
->quiesce(mddev
, 0);
391 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
392 md_wakeup_thread(mddev
->thread
);
393 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
395 EXPORT_SYMBOL_GPL(mddev_resume
);
397 int mddev_congested(struct mddev
*mddev
, int bits
)
399 struct md_personality
*pers
= mddev
->pers
;
403 if (mddev
->suspended
)
405 else if (pers
&& pers
->congested
)
406 ret
= pers
->congested(mddev
, bits
);
410 EXPORT_SYMBOL_GPL(mddev_congested
);
411 static int md_congested(void *data
, int bits
)
413 struct mddev
*mddev
= data
;
414 return mddev_congested(mddev
, bits
);
418 * Generic flush handling for md
421 static void md_end_flush(struct bio
*bio
)
423 struct md_rdev
*rdev
= bio
->bi_private
;
424 struct mddev
*mddev
= rdev
->mddev
;
426 rdev_dec_pending(rdev
, mddev
);
428 if (atomic_dec_and_test(&mddev
->flush_pending
)) {
429 /* The pre-request flush has finished */
430 queue_work(md_wq
, &mddev
->flush_work
);
435 static void md_submit_flush_data(struct work_struct
*ws
);
437 static void submit_flushes(struct work_struct
*ws
)
439 struct mddev
*mddev
= container_of(ws
, struct mddev
, flush_work
);
440 struct md_rdev
*rdev
;
442 mddev
->start_flush
= ktime_get_boottime();
443 INIT_WORK(&mddev
->flush_work
, md_submit_flush_data
);
444 atomic_set(&mddev
->flush_pending
, 1);
446 rdev_for_each_rcu(rdev
, mddev
)
447 if (rdev
->raid_disk
>= 0 &&
448 !test_bit(Faulty
, &rdev
->flags
)) {
449 /* Take two references, one is dropped
450 * when request finishes, one after
451 * we reclaim rcu_read_lock
454 atomic_inc(&rdev
->nr_pending
);
455 atomic_inc(&rdev
->nr_pending
);
457 bi
= bio_alloc_mddev(GFP_NOIO
, 0, mddev
);
458 bi
->bi_end_io
= md_end_flush
;
459 bi
->bi_private
= rdev
;
460 bio_set_dev(bi
, rdev
->bdev
);
461 bi
->bi_opf
= REQ_OP_WRITE
| REQ_PREFLUSH
;
462 atomic_inc(&mddev
->flush_pending
);
465 rdev_dec_pending(rdev
, mddev
);
468 if (atomic_dec_and_test(&mddev
->flush_pending
))
469 queue_work(md_wq
, &mddev
->flush_work
);
472 static void md_submit_flush_data(struct work_struct
*ws
)
474 struct mddev
*mddev
= container_of(ws
, struct mddev
, flush_work
);
475 struct bio
*bio
= mddev
->flush_bio
;
478 * must reset flush_bio before calling into md_handle_request to avoid a
479 * deadlock, because other bios passed md_handle_request suspend check
480 * could wait for this and below md_handle_request could wait for those
481 * bios because of suspend check
483 mddev
->last_flush
= mddev
->start_flush
;
484 mddev
->flush_bio
= NULL
;
485 wake_up(&mddev
->sb_wait
);
487 if (bio
->bi_iter
.bi_size
== 0)
488 /* an empty barrier - all done */
491 bio
->bi_opf
&= ~REQ_PREFLUSH
;
492 md_handle_request(mddev
, bio
);
497 * Manages consolidation of flushes and submitting any flushes needed for
498 * a bio with REQ_PREFLUSH. Returns true if the bio is finished or is
499 * being finished in another context. Returns false if the flushing is
500 * complete but still needs the I/O portion of the bio to be processed.
502 bool md_flush_request(struct mddev
*mddev
, struct bio
*bio
)
504 ktime_t start
= ktime_get_boottime();
505 spin_lock_irq(&mddev
->lock
);
506 wait_event_lock_irq(mddev
->sb_wait
,
508 ktime_after(mddev
->last_flush
, start
),
510 if (!ktime_after(mddev
->last_flush
, start
)) {
511 WARN_ON(mddev
->flush_bio
);
512 mddev
->flush_bio
= bio
;
515 spin_unlock_irq(&mddev
->lock
);
518 INIT_WORK(&mddev
->flush_work
, submit_flushes
);
519 queue_work(md_wq
, &mddev
->flush_work
);
521 /* flush was performed for some other bio while we waited. */
522 if (bio
->bi_iter
.bi_size
== 0)
523 /* an empty barrier - all done */
526 bio
->bi_opf
&= ~REQ_PREFLUSH
;
532 EXPORT_SYMBOL(md_flush_request
);
534 static inline struct mddev
*mddev_get(struct mddev
*mddev
)
536 atomic_inc(&mddev
->active
);
540 static void mddev_delayed_delete(struct work_struct
*ws
);
542 static void mddev_put(struct mddev
*mddev
)
544 struct bio_set
*bs
= NULL
, *sync_bs
= NULL
;
546 if (!atomic_dec_and_lock(&mddev
->active
, &all_mddevs_lock
))
548 if (!mddev
->raid_disks
&& list_empty(&mddev
->disks
) &&
549 mddev
->ctime
== 0 && !mddev
->hold_active
) {
550 /* Array is not configured at all, and not held active,
552 list_del_init(&mddev
->all_mddevs
);
554 sync_bs
= mddev
->sync_set
;
555 mddev
->bio_set
= NULL
;
556 mddev
->sync_set
= NULL
;
557 if (mddev
->gendisk
) {
558 /* We did a probe so need to clean up. Call
559 * queue_work inside the spinlock so that
560 * flush_workqueue() after mddev_find will
561 * succeed in waiting for the work to be done.
563 INIT_WORK(&mddev
->del_work
, mddev_delayed_delete
);
564 queue_work(md_misc_wq
, &mddev
->del_work
);
568 spin_unlock(&all_mddevs_lock
);
572 bioset_free(sync_bs
);
575 static void md_safemode_timeout(struct timer_list
*t
);
577 void mddev_init(struct mddev
*mddev
)
579 mutex_init(&mddev
->open_mutex
);
580 mutex_init(&mddev
->reconfig_mutex
);
581 mutex_init(&mddev
->bitmap_info
.mutex
);
582 INIT_LIST_HEAD(&mddev
->disks
);
583 INIT_LIST_HEAD(&mddev
->all_mddevs
);
584 timer_setup(&mddev
->safemode_timer
, md_safemode_timeout
, 0);
585 atomic_set(&mddev
->active
, 1);
586 atomic_set(&mddev
->openers
, 0);
587 atomic_set(&mddev
->active_io
, 0);
588 spin_lock_init(&mddev
->lock
);
589 atomic_set(&mddev
->flush_pending
, 0);
590 init_waitqueue_head(&mddev
->sb_wait
);
591 init_waitqueue_head(&mddev
->recovery_wait
);
592 mddev
->reshape_position
= MaxSector
;
593 mddev
->reshape_backwards
= 0;
594 mddev
->last_sync_action
= "none";
595 mddev
->resync_min
= 0;
596 mddev
->resync_max
= MaxSector
;
597 mddev
->level
= LEVEL_NONE
;
599 EXPORT_SYMBOL_GPL(mddev_init
);
601 static struct mddev
*mddev_find(dev_t unit
)
603 struct mddev
*mddev
, *new = NULL
;
605 if (unit
&& MAJOR(unit
) != MD_MAJOR
)
606 unit
&= ~((1<<MdpMinorShift
)-1);
609 spin_lock(&all_mddevs_lock
);
612 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
613 if (mddev
->unit
== unit
) {
615 spin_unlock(&all_mddevs_lock
);
621 list_add(&new->all_mddevs
, &all_mddevs
);
622 spin_unlock(&all_mddevs_lock
);
623 new->hold_active
= UNTIL_IOCTL
;
627 /* find an unused unit number */
628 static int next_minor
= 512;
629 int start
= next_minor
;
633 dev
= MKDEV(MD_MAJOR
, next_minor
);
635 if (next_minor
> MINORMASK
)
637 if (next_minor
== start
) {
638 /* Oh dear, all in use. */
639 spin_unlock(&all_mddevs_lock
);
645 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
646 if (mddev
->unit
== dev
) {
652 new->md_minor
= MINOR(dev
);
653 new->hold_active
= UNTIL_STOP
;
654 list_add(&new->all_mddevs
, &all_mddevs
);
655 spin_unlock(&all_mddevs_lock
);
658 spin_unlock(&all_mddevs_lock
);
660 new = kzalloc(sizeof(*new), GFP_KERNEL
);
665 if (MAJOR(unit
) == MD_MAJOR
)
666 new->md_minor
= MINOR(unit
);
668 new->md_minor
= MINOR(unit
) >> MdpMinorShift
;
675 static struct attribute_group md_redundancy_group
;
677 void mddev_unlock(struct mddev
*mddev
)
679 if (mddev
->to_remove
) {
680 /* These cannot be removed under reconfig_mutex as
681 * an access to the files will try to take reconfig_mutex
682 * while holding the file unremovable, which leads to
684 * So hold set sysfs_active while the remove in happeing,
685 * and anything else which might set ->to_remove or my
686 * otherwise change the sysfs namespace will fail with
687 * -EBUSY if sysfs_active is still set.
688 * We set sysfs_active under reconfig_mutex and elsewhere
689 * test it under the same mutex to ensure its correct value
692 struct attribute_group
*to_remove
= mddev
->to_remove
;
693 mddev
->to_remove
= NULL
;
694 mddev
->sysfs_active
= 1;
695 mutex_unlock(&mddev
->reconfig_mutex
);
697 if (mddev
->kobj
.sd
) {
698 if (to_remove
!= &md_redundancy_group
)
699 sysfs_remove_group(&mddev
->kobj
, to_remove
);
700 if (mddev
->pers
== NULL
||
701 mddev
->pers
->sync_request
== NULL
) {
702 sysfs_remove_group(&mddev
->kobj
, &md_redundancy_group
);
703 if (mddev
->sysfs_action
)
704 sysfs_put(mddev
->sysfs_action
);
705 mddev
->sysfs_action
= NULL
;
708 mddev
->sysfs_active
= 0;
710 mutex_unlock(&mddev
->reconfig_mutex
);
712 /* As we've dropped the mutex we need a spinlock to
713 * make sure the thread doesn't disappear
715 spin_lock(&pers_lock
);
716 md_wakeup_thread(mddev
->thread
);
717 wake_up(&mddev
->sb_wait
);
718 spin_unlock(&pers_lock
);
720 EXPORT_SYMBOL_GPL(mddev_unlock
);
722 struct md_rdev
*md_find_rdev_nr_rcu(struct mddev
*mddev
, int nr
)
724 struct md_rdev
*rdev
;
726 rdev_for_each_rcu(rdev
, mddev
)
727 if (rdev
->desc_nr
== nr
)
732 EXPORT_SYMBOL_GPL(md_find_rdev_nr_rcu
);
734 static struct md_rdev
*find_rdev(struct mddev
*mddev
, dev_t dev
)
736 struct md_rdev
*rdev
;
738 rdev_for_each(rdev
, mddev
)
739 if (rdev
->bdev
->bd_dev
== dev
)
745 static struct md_rdev
*find_rdev_rcu(struct mddev
*mddev
, dev_t dev
)
747 struct md_rdev
*rdev
;
749 rdev_for_each_rcu(rdev
, mddev
)
750 if (rdev
->bdev
->bd_dev
== dev
)
756 static struct md_personality
*find_pers(int level
, char *clevel
)
758 struct md_personality
*pers
;
759 list_for_each_entry(pers
, &pers_list
, list
) {
760 if (level
!= LEVEL_NONE
&& pers
->level
== level
)
762 if (strcmp(pers
->name
, clevel
)==0)
768 /* return the offset of the super block in 512byte sectors */
769 static inline sector_t
calc_dev_sboffset(struct md_rdev
*rdev
)
771 sector_t num_sectors
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
772 return MD_NEW_SIZE_SECTORS(num_sectors
);
775 static int alloc_disk_sb(struct md_rdev
*rdev
)
777 rdev
->sb_page
= alloc_page(GFP_KERNEL
);
783 void md_rdev_clear(struct md_rdev
*rdev
)
786 put_page(rdev
->sb_page
);
788 rdev
->sb_page
= NULL
;
793 put_page(rdev
->bb_page
);
794 rdev
->bb_page
= NULL
;
796 badblocks_exit(&rdev
->badblocks
);
798 EXPORT_SYMBOL_GPL(md_rdev_clear
);
800 static void super_written(struct bio
*bio
)
802 struct md_rdev
*rdev
= bio
->bi_private
;
803 struct mddev
*mddev
= rdev
->mddev
;
805 if (bio
->bi_status
) {
806 pr_err("md: super_written gets error=%d\n", bio
->bi_status
);
807 md_error(mddev
, rdev
);
808 if (!test_bit(Faulty
, &rdev
->flags
)
809 && (bio
->bi_opf
& MD_FAILFAST
)) {
810 set_bit(MD_SB_NEED_REWRITE
, &mddev
->sb_flags
);
811 set_bit(LastDev
, &rdev
->flags
);
814 clear_bit(LastDev
, &rdev
->flags
);
816 if (atomic_dec_and_test(&mddev
->pending_writes
))
817 wake_up(&mddev
->sb_wait
);
818 rdev_dec_pending(rdev
, mddev
);
822 void md_super_write(struct mddev
*mddev
, struct md_rdev
*rdev
,
823 sector_t sector
, int size
, struct page
*page
)
825 /* write first size bytes of page to sector of rdev
826 * Increment mddev->pending_writes before returning
827 * and decrement it on completion, waking up sb_wait
828 * if zero is reached.
829 * If an error occurred, call md_error
837 if (test_bit(Faulty
, &rdev
->flags
))
840 bio
= md_bio_alloc_sync(mddev
);
842 atomic_inc(&rdev
->nr_pending
);
844 bio_set_dev(bio
, rdev
->meta_bdev
? rdev
->meta_bdev
: rdev
->bdev
);
845 bio
->bi_iter
.bi_sector
= sector
;
846 bio_add_page(bio
, page
, size
, 0);
847 bio
->bi_private
= rdev
;
848 bio
->bi_end_io
= super_written
;
850 if (test_bit(MD_FAILFAST_SUPPORTED
, &mddev
->flags
) &&
851 test_bit(FailFast
, &rdev
->flags
) &&
852 !test_bit(LastDev
, &rdev
->flags
))
854 bio
->bi_opf
= REQ_OP_WRITE
| REQ_SYNC
| REQ_PREFLUSH
| REQ_FUA
| ff
;
856 atomic_inc(&mddev
->pending_writes
);
860 int md_super_wait(struct mddev
*mddev
)
862 /* wait for all superblock writes that were scheduled to complete */
863 wait_event(mddev
->sb_wait
, atomic_read(&mddev
->pending_writes
)==0);
864 if (test_and_clear_bit(MD_SB_NEED_REWRITE
, &mddev
->sb_flags
))
869 int sync_page_io(struct md_rdev
*rdev
, sector_t sector
, int size
,
870 struct page
*page
, int op
, int op_flags
, bool metadata_op
)
872 struct bio
*bio
= md_bio_alloc_sync(rdev
->mddev
);
875 if (metadata_op
&& rdev
->meta_bdev
)
876 bio_set_dev(bio
, rdev
->meta_bdev
);
878 bio_set_dev(bio
, rdev
->bdev
);
879 bio_set_op_attrs(bio
, op
, op_flags
);
881 bio
->bi_iter
.bi_sector
= sector
+ rdev
->sb_start
;
882 else if (rdev
->mddev
->reshape_position
!= MaxSector
&&
883 (rdev
->mddev
->reshape_backwards
==
884 (sector
>= rdev
->mddev
->reshape_position
)))
885 bio
->bi_iter
.bi_sector
= sector
+ rdev
->new_data_offset
;
887 bio
->bi_iter
.bi_sector
= sector
+ rdev
->data_offset
;
888 bio_add_page(bio
, page
, size
, 0);
890 submit_bio_wait(bio
);
892 ret
= !bio
->bi_status
;
896 EXPORT_SYMBOL_GPL(sync_page_io
);
898 static int read_disk_sb(struct md_rdev
*rdev
, int size
)
900 char b
[BDEVNAME_SIZE
];
905 if (!sync_page_io(rdev
, 0, size
, rdev
->sb_page
, REQ_OP_READ
, 0, true))
911 pr_err("md: disabled device %s, could not read superblock.\n",
912 bdevname(rdev
->bdev
,b
));
916 static int md_uuid_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
918 return sb1
->set_uuid0
== sb2
->set_uuid0
&&
919 sb1
->set_uuid1
== sb2
->set_uuid1
&&
920 sb1
->set_uuid2
== sb2
->set_uuid2
&&
921 sb1
->set_uuid3
== sb2
->set_uuid3
;
924 static int md_sb_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
927 mdp_super_t
*tmp1
, *tmp2
;
929 tmp1
= kmalloc(sizeof(*tmp1
),GFP_KERNEL
);
930 tmp2
= kmalloc(sizeof(*tmp2
),GFP_KERNEL
);
932 if (!tmp1
|| !tmp2
) {
941 * nr_disks is not constant
946 ret
= (memcmp(tmp1
, tmp2
, MD_SB_GENERIC_CONSTANT_WORDS
* 4) == 0);
953 static u32
md_csum_fold(u32 csum
)
955 csum
= (csum
& 0xffff) + (csum
>> 16);
956 return (csum
& 0xffff) + (csum
>> 16);
959 static unsigned int calc_sb_csum(mdp_super_t
*sb
)
962 u32
*sb32
= (u32
*)sb
;
964 unsigned int disk_csum
, csum
;
966 disk_csum
= sb
->sb_csum
;
969 for (i
= 0; i
< MD_SB_BYTES
/4 ; i
++)
971 csum
= (newcsum
& 0xffffffff) + (newcsum
>>32);
974 /* This used to use csum_partial, which was wrong for several
975 * reasons including that different results are returned on
976 * different architectures. It isn't critical that we get exactly
977 * the same return value as before (we always csum_fold before
978 * testing, and that removes any differences). However as we
979 * know that csum_partial always returned a 16bit value on
980 * alphas, do a fold to maximise conformity to previous behaviour.
982 sb
->sb_csum
= md_csum_fold(disk_csum
);
984 sb
->sb_csum
= disk_csum
;
990 * Handle superblock details.
991 * We want to be able to handle multiple superblock formats
992 * so we have a common interface to them all, and an array of
993 * different handlers.
994 * We rely on user-space to write the initial superblock, and support
995 * reading and updating of superblocks.
996 * Interface methods are:
997 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version)
998 * loads and validates a superblock on dev.
999 * if refdev != NULL, compare superblocks on both devices
1001 * 0 - dev has a superblock that is compatible with refdev
1002 * 1 - dev has a superblock that is compatible and newer than refdev
1003 * so dev should be used as the refdev in future
1004 * -EINVAL superblock incompatible or invalid
1005 * -othererror e.g. -EIO
1007 * int validate_super(struct mddev *mddev, struct md_rdev *dev)
1008 * Verify that dev is acceptable into mddev.
1009 * The first time, mddev->raid_disks will be 0, and data from
1010 * dev should be merged in. Subsequent calls check that dev
1011 * is new enough. Return 0 or -EINVAL
1013 * void sync_super(struct mddev *mddev, struct md_rdev *dev)
1014 * Update the superblock for rdev with data in mddev
1015 * This does not write to disc.
1021 struct module
*owner
;
1022 int (*load_super
)(struct md_rdev
*rdev
,
1023 struct md_rdev
*refdev
,
1025 int (*validate_super
)(struct mddev
*mddev
,
1026 struct md_rdev
*rdev
);
1027 void (*sync_super
)(struct mddev
*mddev
,
1028 struct md_rdev
*rdev
);
1029 unsigned long long (*rdev_size_change
)(struct md_rdev
*rdev
,
1030 sector_t num_sectors
);
1031 int (*allow_new_offset
)(struct md_rdev
*rdev
,
1032 unsigned long long new_offset
);
1036 * Check that the given mddev has no bitmap.
1038 * This function is called from the run method of all personalities that do not
1039 * support bitmaps. It prints an error message and returns non-zero if mddev
1040 * has a bitmap. Otherwise, it returns 0.
1043 int md_check_no_bitmap(struct mddev
*mddev
)
1045 if (!mddev
->bitmap_info
.file
&& !mddev
->bitmap_info
.offset
)
1047 pr_warn("%s: bitmaps are not supported for %s\n",
1048 mdname(mddev
), mddev
->pers
->name
);
1051 EXPORT_SYMBOL(md_check_no_bitmap
);
1054 * load_super for 0.90.0
1056 static int super_90_load(struct md_rdev
*rdev
, struct md_rdev
*refdev
, int minor_version
)
1058 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1063 * Calculate the position of the superblock (512byte sectors),
1064 * it's at the end of the disk.
1066 * It also happens to be a multiple of 4Kb.
1068 rdev
->sb_start
= calc_dev_sboffset(rdev
);
1070 ret
= read_disk_sb(rdev
, MD_SB_BYTES
);
1076 bdevname(rdev
->bdev
, b
);
1077 sb
= page_address(rdev
->sb_page
);
1079 if (sb
->md_magic
!= MD_SB_MAGIC
) {
1080 pr_warn("md: invalid raid superblock magic on %s\n", b
);
1084 if (sb
->major_version
!= 0 ||
1085 sb
->minor_version
< 90 ||
1086 sb
->minor_version
> 91) {
1087 pr_warn("Bad version number %d.%d on %s\n",
1088 sb
->major_version
, sb
->minor_version
, b
);
1092 if (sb
->raid_disks
<= 0)
1095 if (md_csum_fold(calc_sb_csum(sb
)) != md_csum_fold(sb
->sb_csum
)) {
1096 pr_warn("md: invalid superblock checksum on %s\n", b
);
1100 rdev
->preferred_minor
= sb
->md_minor
;
1101 rdev
->data_offset
= 0;
1102 rdev
->new_data_offset
= 0;
1103 rdev
->sb_size
= MD_SB_BYTES
;
1104 rdev
->badblocks
.shift
= -1;
1106 if (sb
->level
== LEVEL_MULTIPATH
)
1109 rdev
->desc_nr
= sb
->this_disk
.number
;
1115 mdp_super_t
*refsb
= page_address(refdev
->sb_page
);
1116 if (!md_uuid_equal(refsb
, sb
)) {
1117 pr_warn("md: %s has different UUID to %s\n",
1118 b
, bdevname(refdev
->bdev
,b2
));
1121 if (!md_sb_equal(refsb
, sb
)) {
1122 pr_warn("md: %s has same UUID but different superblock to %s\n",
1123 b
, bdevname(refdev
->bdev
, b2
));
1127 ev2
= md_event(refsb
);
1133 rdev
->sectors
= rdev
->sb_start
;
1134 /* Limit to 4TB as metadata cannot record more than that.
1135 * (not needed for Linear and RAID0 as metadata doesn't
1138 if (IS_ENABLED(CONFIG_LBDAF
) && (u64
)rdev
->sectors
>= (2ULL << 32) &&
1140 rdev
->sectors
= (sector_t
)(2ULL << 32) - 2;
1142 if (rdev
->sectors
< ((sector_t
)sb
->size
) * 2 && sb
->level
>= 1)
1143 /* "this cannot possibly happen" ... */
1151 * validate_super for 0.90.0
1153 static int super_90_validate(struct mddev
*mddev
, struct md_rdev
*rdev
)
1156 mdp_super_t
*sb
= page_address(rdev
->sb_page
);
1157 __u64 ev1
= md_event(sb
);
1159 rdev
->raid_disk
= -1;
1160 clear_bit(Faulty
, &rdev
->flags
);
1161 clear_bit(In_sync
, &rdev
->flags
);
1162 clear_bit(Bitmap_sync
, &rdev
->flags
);
1163 clear_bit(WriteMostly
, &rdev
->flags
);
1165 if (mddev
->raid_disks
== 0) {
1166 mddev
->major_version
= 0;
1167 mddev
->minor_version
= sb
->minor_version
;
1168 mddev
->patch_version
= sb
->patch_version
;
1169 mddev
->external
= 0;
1170 mddev
->chunk_sectors
= sb
->chunk_size
>> 9;
1171 mddev
->ctime
= sb
->ctime
;
1172 mddev
->utime
= sb
->utime
;
1173 mddev
->level
= sb
->level
;
1174 mddev
->clevel
[0] = 0;
1175 mddev
->layout
= sb
->layout
;
1176 mddev
->raid_disks
= sb
->raid_disks
;
1177 mddev
->dev_sectors
= ((sector_t
)sb
->size
) * 2;
1178 mddev
->events
= ev1
;
1179 mddev
->bitmap_info
.offset
= 0;
1180 mddev
->bitmap_info
.space
= 0;
1181 /* bitmap can use 60 K after the 4K superblocks */
1182 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
1183 mddev
->bitmap_info
.default_space
= 64*2 - (MD_SB_BYTES
>> 9);
1184 mddev
->reshape_backwards
= 0;
1186 if (mddev
->minor_version
>= 91) {
1187 mddev
->reshape_position
= sb
->reshape_position
;
1188 mddev
->delta_disks
= sb
->delta_disks
;
1189 mddev
->new_level
= sb
->new_level
;
1190 mddev
->new_layout
= sb
->new_layout
;
1191 mddev
->new_chunk_sectors
= sb
->new_chunk
>> 9;
1192 if (mddev
->delta_disks
< 0)
1193 mddev
->reshape_backwards
= 1;
1195 mddev
->reshape_position
= MaxSector
;
1196 mddev
->delta_disks
= 0;
1197 mddev
->new_level
= mddev
->level
;
1198 mddev
->new_layout
= mddev
->layout
;
1199 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1202 if (sb
->state
& (1<<MD_SB_CLEAN
))
1203 mddev
->recovery_cp
= MaxSector
;
1205 if (sb
->events_hi
== sb
->cp_events_hi
&&
1206 sb
->events_lo
== sb
->cp_events_lo
) {
1207 mddev
->recovery_cp
= sb
->recovery_cp
;
1209 mddev
->recovery_cp
= 0;
1212 memcpy(mddev
->uuid
+0, &sb
->set_uuid0
, 4);
1213 memcpy(mddev
->uuid
+4, &sb
->set_uuid1
, 4);
1214 memcpy(mddev
->uuid
+8, &sb
->set_uuid2
, 4);
1215 memcpy(mddev
->uuid
+12,&sb
->set_uuid3
, 4);
1217 mddev
->max_disks
= MD_SB_DISKS
;
1219 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
) &&
1220 mddev
->bitmap_info
.file
== NULL
) {
1221 mddev
->bitmap_info
.offset
=
1222 mddev
->bitmap_info
.default_offset
;
1223 mddev
->bitmap_info
.space
=
1224 mddev
->bitmap_info
.default_space
;
1227 } else if (mddev
->pers
== NULL
) {
1228 /* Insist on good event counter while assembling, except
1229 * for spares (which don't need an event count) */
1231 if (sb
->disks
[rdev
->desc_nr
].state
& (
1232 (1<<MD_DISK_SYNC
) | (1 << MD_DISK_ACTIVE
)))
1233 if (ev1
< mddev
->events
)
1235 } else if (mddev
->bitmap
) {
1236 /* if adding to array with a bitmap, then we can accept an
1237 * older device ... but not too old.
1239 if (ev1
< mddev
->bitmap
->events_cleared
)
1241 if (ev1
< mddev
->events
)
1242 set_bit(Bitmap_sync
, &rdev
->flags
);
1244 if (ev1
< mddev
->events
)
1245 /* just a hot-add of a new device, leave raid_disk at -1 */
1249 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1250 desc
= sb
->disks
+ rdev
->desc_nr
;
1252 if (desc
->state
& (1<<MD_DISK_FAULTY
))
1253 set_bit(Faulty
, &rdev
->flags
);
1254 else if (desc
->state
& (1<<MD_DISK_SYNC
) /* &&
1255 desc->raid_disk < mddev->raid_disks */) {
1256 set_bit(In_sync
, &rdev
->flags
);
1257 rdev
->raid_disk
= desc
->raid_disk
;
1258 rdev
->saved_raid_disk
= desc
->raid_disk
;
1259 } else if (desc
->state
& (1<<MD_DISK_ACTIVE
)) {
1260 /* active but not in sync implies recovery up to
1261 * reshape position. We don't know exactly where
1262 * that is, so set to zero for now */
1263 if (mddev
->minor_version
>= 91) {
1264 rdev
->recovery_offset
= 0;
1265 rdev
->raid_disk
= desc
->raid_disk
;
1268 if (desc
->state
& (1<<MD_DISK_WRITEMOSTLY
))
1269 set_bit(WriteMostly
, &rdev
->flags
);
1270 if (desc
->state
& (1<<MD_DISK_FAILFAST
))
1271 set_bit(FailFast
, &rdev
->flags
);
1272 } else /* MULTIPATH are always insync */
1273 set_bit(In_sync
, &rdev
->flags
);
1278 * sync_super for 0.90.0
1280 static void super_90_sync(struct mddev
*mddev
, struct md_rdev
*rdev
)
1283 struct md_rdev
*rdev2
;
1284 int next_spare
= mddev
->raid_disks
;
1286 /* make rdev->sb match mddev data..
1289 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1290 * 3/ any empty disks < next_spare become removed
1292 * disks[0] gets initialised to REMOVED because
1293 * we cannot be sure from other fields if it has
1294 * been initialised or not.
1297 int active
=0, working
=0,failed
=0,spare
=0,nr_disks
=0;
1299 rdev
->sb_size
= MD_SB_BYTES
;
1301 sb
= page_address(rdev
->sb_page
);
1303 memset(sb
, 0, sizeof(*sb
));
1305 sb
->md_magic
= MD_SB_MAGIC
;
1306 sb
->major_version
= mddev
->major_version
;
1307 sb
->patch_version
= mddev
->patch_version
;
1308 sb
->gvalid_words
= 0; /* ignored */
1309 memcpy(&sb
->set_uuid0
, mddev
->uuid
+0, 4);
1310 memcpy(&sb
->set_uuid1
, mddev
->uuid
+4, 4);
1311 memcpy(&sb
->set_uuid2
, mddev
->uuid
+8, 4);
1312 memcpy(&sb
->set_uuid3
, mddev
->uuid
+12,4);
1314 sb
->ctime
= clamp_t(time64_t
, mddev
->ctime
, 0, U32_MAX
);
1315 sb
->level
= mddev
->level
;
1316 sb
->size
= mddev
->dev_sectors
/ 2;
1317 sb
->raid_disks
= mddev
->raid_disks
;
1318 sb
->md_minor
= mddev
->md_minor
;
1319 sb
->not_persistent
= 0;
1320 sb
->utime
= clamp_t(time64_t
, mddev
->utime
, 0, U32_MAX
);
1322 sb
->events_hi
= (mddev
->events
>>32);
1323 sb
->events_lo
= (u32
)mddev
->events
;
1325 if (mddev
->reshape_position
== MaxSector
)
1326 sb
->minor_version
= 90;
1328 sb
->minor_version
= 91;
1329 sb
->reshape_position
= mddev
->reshape_position
;
1330 sb
->new_level
= mddev
->new_level
;
1331 sb
->delta_disks
= mddev
->delta_disks
;
1332 sb
->new_layout
= mddev
->new_layout
;
1333 sb
->new_chunk
= mddev
->new_chunk_sectors
<< 9;
1335 mddev
->minor_version
= sb
->minor_version
;
1338 sb
->recovery_cp
= mddev
->recovery_cp
;
1339 sb
->cp_events_hi
= (mddev
->events
>>32);
1340 sb
->cp_events_lo
= (u32
)mddev
->events
;
1341 if (mddev
->recovery_cp
== MaxSector
)
1342 sb
->state
= (1<< MD_SB_CLEAN
);
1344 sb
->recovery_cp
= 0;
1346 sb
->layout
= mddev
->layout
;
1347 sb
->chunk_size
= mddev
->chunk_sectors
<< 9;
1349 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
)
1350 sb
->state
|= (1<<MD_SB_BITMAP_PRESENT
);
1352 sb
->disks
[0].state
= (1<<MD_DISK_REMOVED
);
1353 rdev_for_each(rdev2
, mddev
) {
1356 int is_active
= test_bit(In_sync
, &rdev2
->flags
);
1358 if (rdev2
->raid_disk
>= 0 &&
1359 sb
->minor_version
>= 91)
1360 /* we have nowhere to store the recovery_offset,
1361 * but if it is not below the reshape_position,
1362 * we can piggy-back on that.
1365 if (rdev2
->raid_disk
< 0 ||
1366 test_bit(Faulty
, &rdev2
->flags
))
1369 desc_nr
= rdev2
->raid_disk
;
1371 desc_nr
= next_spare
++;
1372 rdev2
->desc_nr
= desc_nr
;
1373 d
= &sb
->disks
[rdev2
->desc_nr
];
1375 d
->number
= rdev2
->desc_nr
;
1376 d
->major
= MAJOR(rdev2
->bdev
->bd_dev
);
1377 d
->minor
= MINOR(rdev2
->bdev
->bd_dev
);
1379 d
->raid_disk
= rdev2
->raid_disk
;
1381 d
->raid_disk
= rdev2
->desc_nr
; /* compatibility */
1382 if (test_bit(Faulty
, &rdev2
->flags
))
1383 d
->state
= (1<<MD_DISK_FAULTY
);
1384 else if (is_active
) {
1385 d
->state
= (1<<MD_DISK_ACTIVE
);
1386 if (test_bit(In_sync
, &rdev2
->flags
))
1387 d
->state
|= (1<<MD_DISK_SYNC
);
1395 if (test_bit(WriteMostly
, &rdev2
->flags
))
1396 d
->state
|= (1<<MD_DISK_WRITEMOSTLY
);
1397 if (test_bit(FailFast
, &rdev2
->flags
))
1398 d
->state
|= (1<<MD_DISK_FAILFAST
);
1400 /* now set the "removed" and "faulty" bits on any missing devices */
1401 for (i
=0 ; i
< mddev
->raid_disks
; i
++) {
1402 mdp_disk_t
*d
= &sb
->disks
[i
];
1403 if (d
->state
== 0 && d
->number
== 0) {
1406 d
->state
= (1<<MD_DISK_REMOVED
);
1407 d
->state
|= (1<<MD_DISK_FAULTY
);
1411 sb
->nr_disks
= nr_disks
;
1412 sb
->active_disks
= active
;
1413 sb
->working_disks
= working
;
1414 sb
->failed_disks
= failed
;
1415 sb
->spare_disks
= spare
;
1417 sb
->this_disk
= sb
->disks
[rdev
->desc_nr
];
1418 sb
->sb_csum
= calc_sb_csum(sb
);
1422 * rdev_size_change for 0.90.0
1424 static unsigned long long
1425 super_90_rdev_size_change(struct md_rdev
*rdev
, sector_t num_sectors
)
1427 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1428 return 0; /* component must fit device */
1429 if (rdev
->mddev
->bitmap_info
.offset
)
1430 return 0; /* can't move bitmap */
1431 rdev
->sb_start
= calc_dev_sboffset(rdev
);
1432 if (!num_sectors
|| num_sectors
> rdev
->sb_start
)
1433 num_sectors
= rdev
->sb_start
;
1434 /* Limit to 4TB as metadata cannot record more than that.
1435 * 4TB == 2^32 KB, or 2*2^32 sectors.
1437 if (IS_ENABLED(CONFIG_LBDAF
) && (u64
)num_sectors
>= (2ULL << 32) &&
1438 rdev
->mddev
->level
>= 1)
1439 num_sectors
= (sector_t
)(2ULL << 32) - 2;
1441 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1443 } while (md_super_wait(rdev
->mddev
) < 0);
1448 super_90_allow_new_offset(struct md_rdev
*rdev
, unsigned long long new_offset
)
1450 /* non-zero offset changes not possible with v0.90 */
1451 return new_offset
== 0;
1455 * version 1 superblock
1458 static __le32
calc_sb_1_csum(struct mdp_superblock_1
*sb
)
1462 unsigned long long newcsum
;
1463 int size
= 256 + le32_to_cpu(sb
->max_dev
)*2;
1464 __le32
*isuper
= (__le32
*)sb
;
1466 disk_csum
= sb
->sb_csum
;
1469 for (; size
>= 4; size
-= 4)
1470 newcsum
+= le32_to_cpu(*isuper
++);
1473 newcsum
+= le16_to_cpu(*(__le16
*) isuper
);
1475 csum
= (newcsum
& 0xffffffff) + (newcsum
>> 32);
1476 sb
->sb_csum
= disk_csum
;
1477 return cpu_to_le32(csum
);
1480 static int super_1_load(struct md_rdev
*rdev
, struct md_rdev
*refdev
, int minor_version
)
1482 struct mdp_superblock_1
*sb
;
1486 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1490 * Calculate the position of the superblock in 512byte sectors.
1491 * It is always aligned to a 4K boundary and
1492 * depeding on minor_version, it can be:
1493 * 0: At least 8K, but less than 12K, from end of device
1494 * 1: At start of device
1495 * 2: 4K from start of device.
1497 switch(minor_version
) {
1499 sb_start
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1501 sb_start
&= ~(sector_t
)(4*2-1);
1512 rdev
->sb_start
= sb_start
;
1514 /* superblock is rarely larger than 1K, but it can be larger,
1515 * and it is safe to read 4k, so we do that
1517 ret
= read_disk_sb(rdev
, 4096);
1518 if (ret
) return ret
;
1520 sb
= page_address(rdev
->sb_page
);
1522 if (sb
->magic
!= cpu_to_le32(MD_SB_MAGIC
) ||
1523 sb
->major_version
!= cpu_to_le32(1) ||
1524 le32_to_cpu(sb
->max_dev
) > (4096-256)/2 ||
1525 le64_to_cpu(sb
->super_offset
) != rdev
->sb_start
||
1526 (le32_to_cpu(sb
->feature_map
) & ~MD_FEATURE_ALL
) != 0)
1529 if (calc_sb_1_csum(sb
) != sb
->sb_csum
) {
1530 pr_warn("md: invalid superblock checksum on %s\n",
1531 bdevname(rdev
->bdev
,b
));
1534 if (le64_to_cpu(sb
->data_size
) < 10) {
1535 pr_warn("md: data_size too small on %s\n",
1536 bdevname(rdev
->bdev
,b
));
1541 memcmp(sb
->pad3
, sb
->pad3
+1, sizeof(sb
->pad3
) - sizeof(sb
->pad3
[1])))
1542 /* Some padding is non-zero, might be a new feature */
1545 rdev
->preferred_minor
= 0xffff;
1546 rdev
->data_offset
= le64_to_cpu(sb
->data_offset
);
1547 rdev
->new_data_offset
= rdev
->data_offset
;
1548 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
) &&
1549 (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_NEW_OFFSET
))
1550 rdev
->new_data_offset
+= (s32
)le32_to_cpu(sb
->new_offset
);
1551 atomic_set(&rdev
->corrected_errors
, le32_to_cpu(sb
->cnt_corrected_read
));
1553 rdev
->sb_size
= le32_to_cpu(sb
->max_dev
) * 2 + 256;
1554 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1555 if (rdev
->sb_size
& bmask
)
1556 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1559 && rdev
->data_offset
< sb_start
+ (rdev
->sb_size
/512))
1562 && rdev
->new_data_offset
< sb_start
+ (rdev
->sb_size
/512))
1565 if (sb
->level
== cpu_to_le32(LEVEL_MULTIPATH
))
1568 rdev
->desc_nr
= le32_to_cpu(sb
->dev_number
);
1570 if (!rdev
->bb_page
) {
1571 rdev
->bb_page
= alloc_page(GFP_KERNEL
);
1575 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BAD_BLOCKS
) &&
1576 rdev
->badblocks
.count
== 0) {
1577 /* need to load the bad block list.
1578 * Currently we limit it to one page.
1584 int sectors
= le16_to_cpu(sb
->bblog_size
);
1585 if (sectors
> (PAGE_SIZE
/ 512))
1587 offset
= le32_to_cpu(sb
->bblog_offset
);
1590 bb_sector
= (long long)offset
;
1591 if (!sync_page_io(rdev
, bb_sector
, sectors
<< 9,
1592 rdev
->bb_page
, REQ_OP_READ
, 0, true))
1594 bbp
= (u64
*)page_address(rdev
->bb_page
);
1595 rdev
->badblocks
.shift
= sb
->bblog_shift
;
1596 for (i
= 0 ; i
< (sectors
<< (9-3)) ; i
++, bbp
++) {
1597 u64 bb
= le64_to_cpu(*bbp
);
1598 int count
= bb
& (0x3ff);
1599 u64 sector
= bb
>> 10;
1600 sector
<<= sb
->bblog_shift
;
1601 count
<<= sb
->bblog_shift
;
1604 if (badblocks_set(&rdev
->badblocks
, sector
, count
, 1))
1607 } else if (sb
->bblog_offset
!= 0)
1608 rdev
->badblocks
.shift
= 0;
1610 if ((le32_to_cpu(sb
->feature_map
) &
1611 (MD_FEATURE_PPL
| MD_FEATURE_MULTIPLE_PPLS
))) {
1612 rdev
->ppl
.offset
= (__s16
)le16_to_cpu(sb
->ppl
.offset
);
1613 rdev
->ppl
.size
= le16_to_cpu(sb
->ppl
.size
);
1614 rdev
->ppl
.sector
= rdev
->sb_start
+ rdev
->ppl
.offset
;
1621 struct mdp_superblock_1
*refsb
= page_address(refdev
->sb_page
);
1623 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16) != 0 ||
1624 sb
->level
!= refsb
->level
||
1625 sb
->layout
!= refsb
->layout
||
1626 sb
->chunksize
!= refsb
->chunksize
) {
1627 pr_warn("md: %s has strangely different superblock to %s\n",
1628 bdevname(rdev
->bdev
,b
),
1629 bdevname(refdev
->bdev
,b2
));
1632 ev1
= le64_to_cpu(sb
->events
);
1633 ev2
= le64_to_cpu(refsb
->events
);
1640 if (minor_version
) {
1641 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9);
1642 sectors
-= rdev
->data_offset
;
1644 sectors
= rdev
->sb_start
;
1645 if (sectors
< le64_to_cpu(sb
->data_size
))
1647 rdev
->sectors
= le64_to_cpu(sb
->data_size
);
1651 static int super_1_validate(struct mddev
*mddev
, struct md_rdev
*rdev
)
1653 struct mdp_superblock_1
*sb
= page_address(rdev
->sb_page
);
1654 __u64 ev1
= le64_to_cpu(sb
->events
);
1656 rdev
->raid_disk
= -1;
1657 clear_bit(Faulty
, &rdev
->flags
);
1658 clear_bit(In_sync
, &rdev
->flags
);
1659 clear_bit(Bitmap_sync
, &rdev
->flags
);
1660 clear_bit(WriteMostly
, &rdev
->flags
);
1662 if (mddev
->raid_disks
== 0) {
1663 mddev
->major_version
= 1;
1664 mddev
->patch_version
= 0;
1665 mddev
->external
= 0;
1666 mddev
->chunk_sectors
= le32_to_cpu(sb
->chunksize
);
1667 mddev
->ctime
= le64_to_cpu(sb
->ctime
);
1668 mddev
->utime
= le64_to_cpu(sb
->utime
);
1669 mddev
->level
= le32_to_cpu(sb
->level
);
1670 mddev
->clevel
[0] = 0;
1671 mddev
->layout
= le32_to_cpu(sb
->layout
);
1672 mddev
->raid_disks
= le32_to_cpu(sb
->raid_disks
);
1673 mddev
->dev_sectors
= le64_to_cpu(sb
->size
);
1674 mddev
->events
= ev1
;
1675 mddev
->bitmap_info
.offset
= 0;
1676 mddev
->bitmap_info
.space
= 0;
1677 /* Default location for bitmap is 1K after superblock
1678 * using 3K - total of 4K
1680 mddev
->bitmap_info
.default_offset
= 1024 >> 9;
1681 mddev
->bitmap_info
.default_space
= (4096-1024) >> 9;
1682 mddev
->reshape_backwards
= 0;
1684 mddev
->recovery_cp
= le64_to_cpu(sb
->resync_offset
);
1685 memcpy(mddev
->uuid
, sb
->set_uuid
, 16);
1687 mddev
->max_disks
= (4096-256)/2;
1689 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
) &&
1690 mddev
->bitmap_info
.file
== NULL
) {
1691 mddev
->bitmap_info
.offset
=
1692 (__s32
)le32_to_cpu(sb
->bitmap_offset
);
1693 /* Metadata doesn't record how much space is available.
1694 * For 1.0, we assume we can use up to the superblock
1695 * if before, else to 4K beyond superblock.
1696 * For others, assume no change is possible.
1698 if (mddev
->minor_version
> 0)
1699 mddev
->bitmap_info
.space
= 0;
1700 else if (mddev
->bitmap_info
.offset
> 0)
1701 mddev
->bitmap_info
.space
=
1702 8 - mddev
->bitmap_info
.offset
;
1704 mddev
->bitmap_info
.space
=
1705 -mddev
->bitmap_info
.offset
;
1708 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
1709 mddev
->reshape_position
= le64_to_cpu(sb
->reshape_position
);
1710 mddev
->delta_disks
= le32_to_cpu(sb
->delta_disks
);
1711 mddev
->new_level
= le32_to_cpu(sb
->new_level
);
1712 mddev
->new_layout
= le32_to_cpu(sb
->new_layout
);
1713 mddev
->new_chunk_sectors
= le32_to_cpu(sb
->new_chunk
);
1714 if (mddev
->delta_disks
< 0 ||
1715 (mddev
->delta_disks
== 0 &&
1716 (le32_to_cpu(sb
->feature_map
)
1717 & MD_FEATURE_RESHAPE_BACKWARDS
)))
1718 mddev
->reshape_backwards
= 1;
1720 mddev
->reshape_position
= MaxSector
;
1721 mddev
->delta_disks
= 0;
1722 mddev
->new_level
= mddev
->level
;
1723 mddev
->new_layout
= mddev
->layout
;
1724 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1727 if (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_JOURNAL
)
1728 set_bit(MD_HAS_JOURNAL
, &mddev
->flags
);
1730 if (le32_to_cpu(sb
->feature_map
) &
1731 (MD_FEATURE_PPL
| MD_FEATURE_MULTIPLE_PPLS
)) {
1732 if (le32_to_cpu(sb
->feature_map
) &
1733 (MD_FEATURE_BITMAP_OFFSET
| MD_FEATURE_JOURNAL
))
1735 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_PPL
) &&
1736 (le32_to_cpu(sb
->feature_map
) &
1737 MD_FEATURE_MULTIPLE_PPLS
))
1739 set_bit(MD_HAS_PPL
, &mddev
->flags
);
1741 } else if (mddev
->pers
== NULL
) {
1742 /* Insist of good event counter while assembling, except for
1743 * spares (which don't need an event count) */
1745 if (rdev
->desc_nr
>= 0 &&
1746 rdev
->desc_nr
< le32_to_cpu(sb
->max_dev
) &&
1747 (le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]) < MD_DISK_ROLE_MAX
||
1748 le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]) == MD_DISK_ROLE_JOURNAL
))
1749 if (ev1
< mddev
->events
)
1751 } else if (mddev
->bitmap
) {
1752 /* If adding to array with a bitmap, then we can accept an
1753 * older device, but not too old.
1755 if (ev1
< mddev
->bitmap
->events_cleared
)
1757 if (ev1
< mddev
->events
)
1758 set_bit(Bitmap_sync
, &rdev
->flags
);
1760 if (ev1
< mddev
->events
)
1761 /* just a hot-add of a new device, leave raid_disk at -1 */
1764 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1766 if (rdev
->desc_nr
< 0 ||
1767 rdev
->desc_nr
>= le32_to_cpu(sb
->max_dev
)) {
1768 role
= MD_DISK_ROLE_SPARE
;
1771 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
1773 case MD_DISK_ROLE_SPARE
: /* spare */
1775 case MD_DISK_ROLE_FAULTY
: /* faulty */
1776 set_bit(Faulty
, &rdev
->flags
);
1778 case MD_DISK_ROLE_JOURNAL
: /* journal device */
1779 if (!(le32_to_cpu(sb
->feature_map
) & MD_FEATURE_JOURNAL
)) {
1780 /* journal device without journal feature */
1781 pr_warn("md: journal device provided without journal feature, ignoring the device\n");
1784 set_bit(Journal
, &rdev
->flags
);
1785 rdev
->journal_tail
= le64_to_cpu(sb
->journal_tail
);
1786 rdev
->raid_disk
= 0;
1789 rdev
->saved_raid_disk
= role
;
1790 if ((le32_to_cpu(sb
->feature_map
) &
1791 MD_FEATURE_RECOVERY_OFFSET
)) {
1792 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
1793 if (!(le32_to_cpu(sb
->feature_map
) &
1794 MD_FEATURE_RECOVERY_BITMAP
))
1795 rdev
->saved_raid_disk
= -1;
1798 * If the array is FROZEN, then the device can't
1799 * be in_sync with rest of array.
1801 if (!test_bit(MD_RECOVERY_FROZEN
,
1803 set_bit(In_sync
, &rdev
->flags
);
1805 rdev
->raid_disk
= role
;
1808 if (sb
->devflags
& WriteMostly1
)
1809 set_bit(WriteMostly
, &rdev
->flags
);
1810 if (sb
->devflags
& FailFast1
)
1811 set_bit(FailFast
, &rdev
->flags
);
1812 if (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_REPLACEMENT
)
1813 set_bit(Replacement
, &rdev
->flags
);
1814 } else /* MULTIPATH are always insync */
1815 set_bit(In_sync
, &rdev
->flags
);
1820 static void super_1_sync(struct mddev
*mddev
, struct md_rdev
*rdev
)
1822 struct mdp_superblock_1
*sb
;
1823 struct md_rdev
*rdev2
;
1825 /* make rdev->sb match mddev and rdev data. */
1827 sb
= page_address(rdev
->sb_page
);
1829 sb
->feature_map
= 0;
1831 sb
->recovery_offset
= cpu_to_le64(0);
1832 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
1834 sb
->utime
= cpu_to_le64((__u64
)mddev
->utime
);
1835 sb
->events
= cpu_to_le64(mddev
->events
);
1837 sb
->resync_offset
= cpu_to_le64(mddev
->recovery_cp
);
1838 else if (test_bit(MD_JOURNAL_CLEAN
, &mddev
->flags
))
1839 sb
->resync_offset
= cpu_to_le64(MaxSector
);
1841 sb
->resync_offset
= cpu_to_le64(0);
1843 sb
->cnt_corrected_read
= cpu_to_le32(atomic_read(&rdev
->corrected_errors
));
1845 sb
->raid_disks
= cpu_to_le32(mddev
->raid_disks
);
1846 sb
->size
= cpu_to_le64(mddev
->dev_sectors
);
1847 sb
->chunksize
= cpu_to_le32(mddev
->chunk_sectors
);
1848 sb
->level
= cpu_to_le32(mddev
->level
);
1849 sb
->layout
= cpu_to_le32(mddev
->layout
);
1850 if (test_bit(FailFast
, &rdev
->flags
))
1851 sb
->devflags
|= FailFast1
;
1853 sb
->devflags
&= ~FailFast1
;
1855 if (test_bit(WriteMostly
, &rdev
->flags
))
1856 sb
->devflags
|= WriteMostly1
;
1858 sb
->devflags
&= ~WriteMostly1
;
1859 sb
->data_offset
= cpu_to_le64(rdev
->data_offset
);
1860 sb
->data_size
= cpu_to_le64(rdev
->sectors
);
1862 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
) {
1863 sb
->bitmap_offset
= cpu_to_le32((__u32
)mddev
->bitmap_info
.offset
);
1864 sb
->feature_map
= cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
);
1867 if (rdev
->raid_disk
>= 0 && !test_bit(Journal
, &rdev
->flags
) &&
1868 !test_bit(In_sync
, &rdev
->flags
)) {
1870 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET
);
1871 sb
->recovery_offset
=
1872 cpu_to_le64(rdev
->recovery_offset
);
1873 if (rdev
->saved_raid_disk
>= 0 && mddev
->bitmap
)
1875 cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP
);
1877 /* Note: recovery_offset and journal_tail share space */
1878 if (test_bit(Journal
, &rdev
->flags
))
1879 sb
->journal_tail
= cpu_to_le64(rdev
->journal_tail
);
1880 if (test_bit(Replacement
, &rdev
->flags
))
1882 cpu_to_le32(MD_FEATURE_REPLACEMENT
);
1884 if (mddev
->reshape_position
!= MaxSector
) {
1885 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE
);
1886 sb
->reshape_position
= cpu_to_le64(mddev
->reshape_position
);
1887 sb
->new_layout
= cpu_to_le32(mddev
->new_layout
);
1888 sb
->delta_disks
= cpu_to_le32(mddev
->delta_disks
);
1889 sb
->new_level
= cpu_to_le32(mddev
->new_level
);
1890 sb
->new_chunk
= cpu_to_le32(mddev
->new_chunk_sectors
);
1891 if (mddev
->delta_disks
== 0 &&
1892 mddev
->reshape_backwards
)
1894 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS
);
1895 if (rdev
->new_data_offset
!= rdev
->data_offset
) {
1897 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET
);
1898 sb
->new_offset
= cpu_to_le32((__u32
)(rdev
->new_data_offset
1899 - rdev
->data_offset
));
1903 if (mddev_is_clustered(mddev
))
1904 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_CLUSTERED
);
1906 if (rdev
->badblocks
.count
== 0)
1907 /* Nothing to do for bad blocks*/ ;
1908 else if (sb
->bblog_offset
== 0)
1909 /* Cannot record bad blocks on this device */
1910 md_error(mddev
, rdev
);
1912 struct badblocks
*bb
= &rdev
->badblocks
;
1913 u64
*bbp
= (u64
*)page_address(rdev
->bb_page
);
1915 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_BAD_BLOCKS
);
1920 seq
= read_seqbegin(&bb
->lock
);
1922 memset(bbp
, 0xff, PAGE_SIZE
);
1924 for (i
= 0 ; i
< bb
->count
; i
++) {
1925 u64 internal_bb
= p
[i
];
1926 u64 store_bb
= ((BB_OFFSET(internal_bb
) << 10)
1927 | BB_LEN(internal_bb
));
1928 bbp
[i
] = cpu_to_le64(store_bb
);
1931 if (read_seqretry(&bb
->lock
, seq
))
1934 bb
->sector
= (rdev
->sb_start
+
1935 (int)le32_to_cpu(sb
->bblog_offset
));
1936 bb
->size
= le16_to_cpu(sb
->bblog_size
);
1941 rdev_for_each(rdev2
, mddev
)
1942 if (rdev2
->desc_nr
+1 > max_dev
)
1943 max_dev
= rdev2
->desc_nr
+1;
1945 if (max_dev
> le32_to_cpu(sb
->max_dev
)) {
1947 sb
->max_dev
= cpu_to_le32(max_dev
);
1948 rdev
->sb_size
= max_dev
* 2 + 256;
1949 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1950 if (rdev
->sb_size
& bmask
)
1951 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1953 max_dev
= le32_to_cpu(sb
->max_dev
);
1955 for (i
=0; i
<max_dev
;i
++)
1956 sb
->dev_roles
[i
] = cpu_to_le16(MD_DISK_ROLE_SPARE
);
1958 if (test_bit(MD_HAS_JOURNAL
, &mddev
->flags
))
1959 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_JOURNAL
);
1961 if (test_bit(MD_HAS_PPL
, &mddev
->flags
)) {
1962 if (test_bit(MD_HAS_MULTIPLE_PPLS
, &mddev
->flags
))
1964 cpu_to_le32(MD_FEATURE_MULTIPLE_PPLS
);
1966 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_PPL
);
1967 sb
->ppl
.offset
= cpu_to_le16(rdev
->ppl
.offset
);
1968 sb
->ppl
.size
= cpu_to_le16(rdev
->ppl
.size
);
1971 rdev_for_each(rdev2
, mddev
) {
1973 if (test_bit(Faulty
, &rdev2
->flags
))
1974 sb
->dev_roles
[i
] = cpu_to_le16(MD_DISK_ROLE_FAULTY
);
1975 else if (test_bit(In_sync
, &rdev2
->flags
))
1976 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1977 else if (test_bit(Journal
, &rdev2
->flags
))
1978 sb
->dev_roles
[i
] = cpu_to_le16(MD_DISK_ROLE_JOURNAL
);
1979 else if (rdev2
->raid_disk
>= 0)
1980 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1982 sb
->dev_roles
[i
] = cpu_to_le16(MD_DISK_ROLE_SPARE
);
1985 sb
->sb_csum
= calc_sb_1_csum(sb
);
1988 static unsigned long long
1989 super_1_rdev_size_change(struct md_rdev
*rdev
, sector_t num_sectors
)
1991 struct mdp_superblock_1
*sb
;
1992 sector_t max_sectors
;
1993 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1994 return 0; /* component must fit device */
1995 if (rdev
->data_offset
!= rdev
->new_data_offset
)
1996 return 0; /* too confusing */
1997 if (rdev
->sb_start
< rdev
->data_offset
) {
1998 /* minor versions 1 and 2; superblock before data */
1999 max_sectors
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
2000 max_sectors
-= rdev
->data_offset
;
2001 if (!num_sectors
|| num_sectors
> max_sectors
)
2002 num_sectors
= max_sectors
;
2003 } else if (rdev
->mddev
->bitmap_info
.offset
) {
2004 /* minor version 0 with bitmap we can't move */
2007 /* minor version 0; superblock after data */
2009 sb_start
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) - 8*2;
2010 sb_start
&= ~(sector_t
)(4*2 - 1);
2011 max_sectors
= rdev
->sectors
+ sb_start
- rdev
->sb_start
;
2012 if (!num_sectors
|| num_sectors
> max_sectors
)
2013 num_sectors
= max_sectors
;
2014 rdev
->sb_start
= sb_start
;
2016 sb
= page_address(rdev
->sb_page
);
2017 sb
->data_size
= cpu_to_le64(num_sectors
);
2018 sb
->super_offset
= cpu_to_le64(rdev
->sb_start
);
2019 sb
->sb_csum
= calc_sb_1_csum(sb
);
2021 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
2023 } while (md_super_wait(rdev
->mddev
) < 0);
2029 super_1_allow_new_offset(struct md_rdev
*rdev
,
2030 unsigned long long new_offset
)
2032 /* All necessary checks on new >= old have been done */
2033 struct bitmap
*bitmap
;
2034 if (new_offset
>= rdev
->data_offset
)
2037 /* with 1.0 metadata, there is no metadata to tread on
2038 * so we can always move back */
2039 if (rdev
->mddev
->minor_version
== 0)
2042 /* otherwise we must be sure not to step on
2043 * any metadata, so stay:
2044 * 36K beyond start of superblock
2045 * beyond end of badblocks
2046 * beyond write-intent bitmap
2048 if (rdev
->sb_start
+ (32+4)*2 > new_offset
)
2050 bitmap
= rdev
->mddev
->bitmap
;
2051 if (bitmap
&& !rdev
->mddev
->bitmap_info
.file
&&
2052 rdev
->sb_start
+ rdev
->mddev
->bitmap_info
.offset
+
2053 bitmap
->storage
.file_pages
* (PAGE_SIZE
>>9) > new_offset
)
2055 if (rdev
->badblocks
.sector
+ rdev
->badblocks
.size
> new_offset
)
2061 static struct super_type super_types
[] = {
2064 .owner
= THIS_MODULE
,
2065 .load_super
= super_90_load
,
2066 .validate_super
= super_90_validate
,
2067 .sync_super
= super_90_sync
,
2068 .rdev_size_change
= super_90_rdev_size_change
,
2069 .allow_new_offset
= super_90_allow_new_offset
,
2073 .owner
= THIS_MODULE
,
2074 .load_super
= super_1_load
,
2075 .validate_super
= super_1_validate
,
2076 .sync_super
= super_1_sync
,
2077 .rdev_size_change
= super_1_rdev_size_change
,
2078 .allow_new_offset
= super_1_allow_new_offset
,
2082 static void sync_super(struct mddev
*mddev
, struct md_rdev
*rdev
)
2084 if (mddev
->sync_super
) {
2085 mddev
->sync_super(mddev
, rdev
);
2089 BUG_ON(mddev
->major_version
>= ARRAY_SIZE(super_types
));
2091 super_types
[mddev
->major_version
].sync_super(mddev
, rdev
);
2094 static int match_mddev_units(struct mddev
*mddev1
, struct mddev
*mddev2
)
2096 struct md_rdev
*rdev
, *rdev2
;
2099 rdev_for_each_rcu(rdev
, mddev1
) {
2100 if (test_bit(Faulty
, &rdev
->flags
) ||
2101 test_bit(Journal
, &rdev
->flags
) ||
2102 rdev
->raid_disk
== -1)
2104 rdev_for_each_rcu(rdev2
, mddev2
) {
2105 if (test_bit(Faulty
, &rdev2
->flags
) ||
2106 test_bit(Journal
, &rdev2
->flags
) ||
2107 rdev2
->raid_disk
== -1)
2109 if (rdev
->bdev
->bd_contains
==
2110 rdev2
->bdev
->bd_contains
) {
2120 static LIST_HEAD(pending_raid_disks
);
2123 * Try to register data integrity profile for an mddev
2125 * This is called when an array is started and after a disk has been kicked
2126 * from the array. It only succeeds if all working and active component devices
2127 * are integrity capable with matching profiles.
2129 int md_integrity_register(struct mddev
*mddev
)
2131 struct md_rdev
*rdev
, *reference
= NULL
;
2133 if (list_empty(&mddev
->disks
))
2134 return 0; /* nothing to do */
2135 if (!mddev
->gendisk
|| blk_get_integrity(mddev
->gendisk
))
2136 return 0; /* shouldn't register, or already is */
2137 rdev_for_each(rdev
, mddev
) {
2138 /* skip spares and non-functional disks */
2139 if (test_bit(Faulty
, &rdev
->flags
))
2141 if (rdev
->raid_disk
< 0)
2144 /* Use the first rdev as the reference */
2148 /* does this rdev's profile match the reference profile? */
2149 if (blk_integrity_compare(reference
->bdev
->bd_disk
,
2150 rdev
->bdev
->bd_disk
) < 0)
2153 if (!reference
|| !bdev_get_integrity(reference
->bdev
))
2156 * All component devices are integrity capable and have matching
2157 * profiles, register the common profile for the md device.
2159 blk_integrity_register(mddev
->gendisk
,
2160 bdev_get_integrity(reference
->bdev
));
2162 pr_debug("md: data integrity enabled on %s\n", mdname(mddev
));
2163 if (bioset_integrity_create(mddev
->bio_set
, BIO_POOL_SIZE
)) {
2164 pr_err("md: failed to create integrity pool for %s\n",
2170 EXPORT_SYMBOL(md_integrity_register
);
2173 * Attempt to add an rdev, but only if it is consistent with the current
2176 int md_integrity_add_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
2178 struct blk_integrity
*bi_rdev
;
2179 struct blk_integrity
*bi_mddev
;
2180 char name
[BDEVNAME_SIZE
];
2182 if (!mddev
->gendisk
)
2185 bi_rdev
= bdev_get_integrity(rdev
->bdev
);
2186 bi_mddev
= blk_get_integrity(mddev
->gendisk
);
2188 if (!bi_mddev
) /* nothing to do */
2191 if (blk_integrity_compare(mddev
->gendisk
, rdev
->bdev
->bd_disk
) != 0) {
2192 pr_err("%s: incompatible integrity profile for %s\n",
2193 mdname(mddev
), bdevname(rdev
->bdev
, name
));
2199 EXPORT_SYMBOL(md_integrity_add_rdev
);
2201 static int bind_rdev_to_array(struct md_rdev
*rdev
, struct mddev
*mddev
)
2203 char b
[BDEVNAME_SIZE
];
2207 /* prevent duplicates */
2208 if (find_rdev(mddev
, rdev
->bdev
->bd_dev
))
2211 if ((bdev_read_only(rdev
->bdev
) || bdev_read_only(rdev
->meta_bdev
)) &&
2215 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2216 if (!test_bit(Journal
, &rdev
->flags
) &&
2218 (mddev
->dev_sectors
== 0 || rdev
->sectors
< mddev
->dev_sectors
)) {
2220 /* Cannot change size, so fail
2221 * If mddev->level <= 0, then we don't care
2222 * about aligning sizes (e.g. linear)
2224 if (mddev
->level
> 0)
2227 mddev
->dev_sectors
= rdev
->sectors
;
2230 /* Verify rdev->desc_nr is unique.
2231 * If it is -1, assign a free number, else
2232 * check number is not in use
2235 if (rdev
->desc_nr
< 0) {
2238 choice
= mddev
->raid_disks
;
2239 while (md_find_rdev_nr_rcu(mddev
, choice
))
2241 rdev
->desc_nr
= choice
;
2243 if (md_find_rdev_nr_rcu(mddev
, rdev
->desc_nr
)) {
2249 if (!test_bit(Journal
, &rdev
->flags
) &&
2250 mddev
->max_disks
&& rdev
->desc_nr
>= mddev
->max_disks
) {
2251 pr_warn("md: %s: array is limited to %d devices\n",
2252 mdname(mddev
), mddev
->max_disks
);
2255 bdevname(rdev
->bdev
,b
);
2256 strreplace(b
, '/', '!');
2258 rdev
->mddev
= mddev
;
2259 pr_debug("md: bind<%s>\n", b
);
2261 if ((err
= kobject_add(&rdev
->kobj
, &mddev
->kobj
, "dev-%s", b
)))
2264 ko
= &part_to_dev(rdev
->bdev
->bd_part
)->kobj
;
2265 if (sysfs_create_link(&rdev
->kobj
, ko
, "block"))
2266 /* failure here is OK */;
2267 rdev
->sysfs_state
= sysfs_get_dirent_safe(rdev
->kobj
.sd
, "state");
2269 list_add_rcu(&rdev
->same_set
, &mddev
->disks
);
2270 bd_link_disk_holder(rdev
->bdev
, mddev
->gendisk
);
2272 /* May as well allow recovery to be retried once */
2273 mddev
->recovery_disabled
++;
2278 pr_warn("md: failed to register dev-%s for %s\n",
2283 static void md_delayed_delete(struct work_struct
*ws
)
2285 struct md_rdev
*rdev
= container_of(ws
, struct md_rdev
, del_work
);
2286 kobject_del(&rdev
->kobj
);
2287 kobject_put(&rdev
->kobj
);
2290 static void unbind_rdev_from_array(struct md_rdev
*rdev
)
2292 char b
[BDEVNAME_SIZE
];
2294 bd_unlink_disk_holder(rdev
->bdev
, rdev
->mddev
->gendisk
);
2295 list_del_rcu(&rdev
->same_set
);
2296 pr_debug("md: unbind<%s>\n", bdevname(rdev
->bdev
,b
));
2298 sysfs_remove_link(&rdev
->kobj
, "block");
2299 sysfs_put(rdev
->sysfs_state
);
2300 rdev
->sysfs_state
= NULL
;
2301 rdev
->badblocks
.count
= 0;
2302 /* We need to delay this, otherwise we can deadlock when
2303 * writing to 'remove' to "dev/state". We also need
2304 * to delay it due to rcu usage.
2307 INIT_WORK(&rdev
->del_work
, md_delayed_delete
);
2308 kobject_get(&rdev
->kobj
);
2309 queue_work(md_misc_wq
, &rdev
->del_work
);
2313 * prevent the device from being mounted, repartitioned or
2314 * otherwise reused by a RAID array (or any other kernel
2315 * subsystem), by bd_claiming the device.
2317 static int lock_rdev(struct md_rdev
*rdev
, dev_t dev
, int shared
)
2320 struct block_device
*bdev
;
2321 char b
[BDEVNAME_SIZE
];
2323 bdev
= blkdev_get_by_dev(dev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
,
2324 shared
? (struct md_rdev
*)lock_rdev
: rdev
);
2326 pr_warn("md: could not open %s.\n", __bdevname(dev
, b
));
2327 return PTR_ERR(bdev
);
2333 static void unlock_rdev(struct md_rdev
*rdev
)
2335 struct block_device
*bdev
= rdev
->bdev
;
2337 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
);
2340 void md_autodetect_dev(dev_t dev
);
2342 static void export_rdev(struct md_rdev
*rdev
)
2344 char b
[BDEVNAME_SIZE
];
2346 pr_debug("md: export_rdev(%s)\n", bdevname(rdev
->bdev
,b
));
2347 md_rdev_clear(rdev
);
2349 if (test_bit(AutoDetected
, &rdev
->flags
))
2350 md_autodetect_dev(rdev
->bdev
->bd_dev
);
2353 kobject_put(&rdev
->kobj
);
2356 void md_kick_rdev_from_array(struct md_rdev
*rdev
)
2358 unbind_rdev_from_array(rdev
);
2361 EXPORT_SYMBOL_GPL(md_kick_rdev_from_array
);
2363 static void export_array(struct mddev
*mddev
)
2365 struct md_rdev
*rdev
;
2367 while (!list_empty(&mddev
->disks
)) {
2368 rdev
= list_first_entry(&mddev
->disks
, struct md_rdev
,
2370 md_kick_rdev_from_array(rdev
);
2372 mddev
->raid_disks
= 0;
2373 mddev
->major_version
= 0;
2376 static bool set_in_sync(struct mddev
*mddev
)
2378 lockdep_assert_held(&mddev
->lock
);
2379 if (!mddev
->in_sync
) {
2380 mddev
->sync_checkers
++;
2381 spin_unlock(&mddev
->lock
);
2382 percpu_ref_switch_to_atomic_sync(&mddev
->writes_pending
);
2383 spin_lock(&mddev
->lock
);
2384 if (!mddev
->in_sync
&&
2385 percpu_ref_is_zero(&mddev
->writes_pending
)) {
2388 * Ensure ->in_sync is visible before we clear
2392 set_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
2393 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
2395 if (--mddev
->sync_checkers
== 0)
2396 percpu_ref_switch_to_percpu(&mddev
->writes_pending
);
2398 if (mddev
->safemode
== 1)
2399 mddev
->safemode
= 0;
2400 return mddev
->in_sync
;
2403 static void sync_sbs(struct mddev
*mddev
, int nospares
)
2405 /* Update each superblock (in-memory image), but
2406 * if we are allowed to, skip spares which already
2407 * have the right event counter, or have one earlier
2408 * (which would mean they aren't being marked as dirty
2409 * with the rest of the array)
2411 struct md_rdev
*rdev
;
2412 rdev_for_each(rdev
, mddev
) {
2413 if (rdev
->sb_events
== mddev
->events
||
2415 rdev
->raid_disk
< 0 &&
2416 rdev
->sb_events
+1 == mddev
->events
)) {
2417 /* Don't update this superblock */
2418 rdev
->sb_loaded
= 2;
2420 sync_super(mddev
, rdev
);
2421 rdev
->sb_loaded
= 1;
2426 static bool does_sb_need_changing(struct mddev
*mddev
)
2428 struct md_rdev
*rdev
;
2429 struct mdp_superblock_1
*sb
;
2432 /* Find a good rdev */
2433 rdev_for_each(rdev
, mddev
)
2434 if ((rdev
->raid_disk
>= 0) && !test_bit(Faulty
, &rdev
->flags
))
2437 /* No good device found. */
2441 sb
= page_address(rdev
->sb_page
);
2442 /* Check if a device has become faulty or a spare become active */
2443 rdev_for_each(rdev
, mddev
) {
2444 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
2445 /* Device activated? */
2446 if (role
== 0xffff && rdev
->raid_disk
>=0 &&
2447 !test_bit(Faulty
, &rdev
->flags
))
2449 /* Device turned faulty? */
2450 if (test_bit(Faulty
, &rdev
->flags
) && (role
< 0xfffd))
2454 /* Check if any mddev parameters have changed */
2455 if ((mddev
->dev_sectors
!= le64_to_cpu(sb
->size
)) ||
2456 (mddev
->reshape_position
!= le64_to_cpu(sb
->reshape_position
)) ||
2457 (mddev
->layout
!= le32_to_cpu(sb
->layout
)) ||
2458 (mddev
->raid_disks
!= le32_to_cpu(sb
->raid_disks
)) ||
2459 (mddev
->chunk_sectors
!= le32_to_cpu(sb
->chunksize
)))
2465 void md_update_sb(struct mddev
*mddev
, int force_change
)
2467 struct md_rdev
*rdev
;
2470 int any_badblocks_changed
= 0;
2475 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
2480 if (mddev_is_clustered(mddev
)) {
2481 if (test_and_clear_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
))
2483 if (test_and_clear_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
))
2485 ret
= md_cluster_ops
->metadata_update_start(mddev
);
2486 /* Has someone else has updated the sb */
2487 if (!does_sb_need_changing(mddev
)) {
2489 md_cluster_ops
->metadata_update_cancel(mddev
);
2490 bit_clear_unless(&mddev
->sb_flags
, BIT(MD_SB_CHANGE_PENDING
),
2491 BIT(MD_SB_CHANGE_DEVS
) |
2492 BIT(MD_SB_CHANGE_CLEAN
));
2498 * First make sure individual recovery_offsets are correct
2499 * curr_resync_completed can only be used during recovery.
2500 * During reshape/resync it might use array-addresses rather
2501 * that device addresses.
2503 rdev_for_each(rdev
, mddev
) {
2504 if (rdev
->raid_disk
>= 0 &&
2505 mddev
->delta_disks
>= 0 &&
2506 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
2507 test_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
) &&
2508 !test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
2509 !test_bit(Journal
, &rdev
->flags
) &&
2510 !test_bit(In_sync
, &rdev
->flags
) &&
2511 mddev
->curr_resync_completed
> rdev
->recovery_offset
)
2512 rdev
->recovery_offset
= mddev
->curr_resync_completed
;
2515 if (!mddev
->persistent
) {
2516 clear_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
2517 clear_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
2518 if (!mddev
->external
) {
2519 clear_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
2520 rdev_for_each(rdev
, mddev
) {
2521 if (rdev
->badblocks
.changed
) {
2522 rdev
->badblocks
.changed
= 0;
2523 ack_all_badblocks(&rdev
->badblocks
);
2524 md_error(mddev
, rdev
);
2526 clear_bit(Blocked
, &rdev
->flags
);
2527 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2528 wake_up(&rdev
->blocked_wait
);
2531 wake_up(&mddev
->sb_wait
);
2535 spin_lock(&mddev
->lock
);
2537 mddev
->utime
= ktime_get_real_seconds();
2539 if (test_and_clear_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
))
2541 if (test_and_clear_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
))
2542 /* just a clean<-> dirty transition, possibly leave spares alone,
2543 * though if events isn't the right even/odd, we will have to do
2549 if (mddev
->degraded
)
2550 /* If the array is degraded, then skipping spares is both
2551 * dangerous and fairly pointless.
2552 * Dangerous because a device that was removed from the array
2553 * might have a event_count that still looks up-to-date,
2554 * so it can be re-added without a resync.
2555 * Pointless because if there are any spares to skip,
2556 * then a recovery will happen and soon that array won't
2557 * be degraded any more and the spare can go back to sleep then.
2561 sync_req
= mddev
->in_sync
;
2563 /* If this is just a dirty<->clean transition, and the array is clean
2564 * and 'events' is odd, we can roll back to the previous clean state */
2566 && (mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
2567 && mddev
->can_decrease_events
2568 && mddev
->events
!= 1) {
2570 mddev
->can_decrease_events
= 0;
2572 /* otherwise we have to go forward and ... */
2574 mddev
->can_decrease_events
= nospares
;
2578 * This 64-bit counter should never wrap.
2579 * Either we are in around ~1 trillion A.C., assuming
2580 * 1 reboot per second, or we have a bug...
2582 WARN_ON(mddev
->events
== 0);
2584 rdev_for_each(rdev
, mddev
) {
2585 if (rdev
->badblocks
.changed
)
2586 any_badblocks_changed
++;
2587 if (test_bit(Faulty
, &rdev
->flags
))
2588 set_bit(FaultRecorded
, &rdev
->flags
);
2591 sync_sbs(mddev
, nospares
);
2592 spin_unlock(&mddev
->lock
);
2594 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2595 mdname(mddev
), mddev
->in_sync
);
2598 blk_add_trace_msg(mddev
->queue
, "md md_update_sb");
2600 bitmap_update_sb(mddev
->bitmap
);
2601 rdev_for_each(rdev
, mddev
) {
2602 char b
[BDEVNAME_SIZE
];
2604 if (rdev
->sb_loaded
!= 1)
2605 continue; /* no noise on spare devices */
2607 if (!test_bit(Faulty
, &rdev
->flags
)) {
2608 md_super_write(mddev
,rdev
,
2609 rdev
->sb_start
, rdev
->sb_size
,
2611 pr_debug("md: (write) %s's sb offset: %llu\n",
2612 bdevname(rdev
->bdev
, b
),
2613 (unsigned long long)rdev
->sb_start
);
2614 rdev
->sb_events
= mddev
->events
;
2615 if (rdev
->badblocks
.size
) {
2616 md_super_write(mddev
, rdev
,
2617 rdev
->badblocks
.sector
,
2618 rdev
->badblocks
.size
<< 9,
2620 rdev
->badblocks
.size
= 0;
2624 pr_debug("md: %s (skipping faulty)\n",
2625 bdevname(rdev
->bdev
, b
));
2627 if (mddev
->level
== LEVEL_MULTIPATH
)
2628 /* only need to write one superblock... */
2631 if (md_super_wait(mddev
) < 0)
2633 /* if there was a failure, MD_SB_CHANGE_DEVS was set, and we re-write super */
2635 if (mddev_is_clustered(mddev
) && ret
== 0)
2636 md_cluster_ops
->metadata_update_finish(mddev
);
2638 if (mddev
->in_sync
!= sync_req
||
2639 !bit_clear_unless(&mddev
->sb_flags
, BIT(MD_SB_CHANGE_PENDING
),
2640 BIT(MD_SB_CHANGE_DEVS
) | BIT(MD_SB_CHANGE_CLEAN
)))
2641 /* have to write it out again */
2643 wake_up(&mddev
->sb_wait
);
2644 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
2645 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
2647 rdev_for_each(rdev
, mddev
) {
2648 if (test_and_clear_bit(FaultRecorded
, &rdev
->flags
))
2649 clear_bit(Blocked
, &rdev
->flags
);
2651 if (any_badblocks_changed
)
2652 ack_all_badblocks(&rdev
->badblocks
);
2653 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2654 wake_up(&rdev
->blocked_wait
);
2657 EXPORT_SYMBOL(md_update_sb
);
2659 static int add_bound_rdev(struct md_rdev
*rdev
)
2661 struct mddev
*mddev
= rdev
->mddev
;
2663 bool add_journal
= test_bit(Journal
, &rdev
->flags
);
2665 if (!mddev
->pers
->hot_remove_disk
|| add_journal
) {
2666 /* If there is hot_add_disk but no hot_remove_disk
2667 * then added disks for geometry changes,
2668 * and should be added immediately.
2670 super_types
[mddev
->major_version
].
2671 validate_super(mddev
, rdev
);
2673 mddev_suspend(mddev
);
2674 err
= mddev
->pers
->hot_add_disk(mddev
, rdev
);
2676 mddev_resume(mddev
);
2678 md_kick_rdev_from_array(rdev
);
2682 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2684 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
2685 if (mddev
->degraded
)
2686 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
2687 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
2688 md_new_event(mddev
);
2689 md_wakeup_thread(mddev
->thread
);
2693 /* words written to sysfs files may, or may not, be \n terminated.
2694 * We want to accept with case. For this we use cmd_match.
2696 static int cmd_match(const char *cmd
, const char *str
)
2698 /* See if cmd, written into a sysfs file, matches
2699 * str. They must either be the same, or cmd can
2700 * have a trailing newline
2702 while (*cmd
&& *str
&& *cmd
== *str
) {
2713 struct rdev_sysfs_entry
{
2714 struct attribute attr
;
2715 ssize_t (*show
)(struct md_rdev
*, char *);
2716 ssize_t (*store
)(struct md_rdev
*, const char *, size_t);
2720 state_show(struct md_rdev
*rdev
, char *page
)
2724 unsigned long flags
= READ_ONCE(rdev
->flags
);
2726 if (test_bit(Faulty
, &flags
) ||
2727 (!test_bit(ExternalBbl
, &flags
) &&
2728 rdev
->badblocks
.unacked_exist
))
2729 len
+= sprintf(page
+len
, "faulty%s", sep
);
2730 if (test_bit(In_sync
, &flags
))
2731 len
+= sprintf(page
+len
, "in_sync%s", sep
);
2732 if (test_bit(Journal
, &flags
))
2733 len
+= sprintf(page
+len
, "journal%s", sep
);
2734 if (test_bit(WriteMostly
, &flags
))
2735 len
+= sprintf(page
+len
, "write_mostly%s", sep
);
2736 if (test_bit(Blocked
, &flags
) ||
2737 (rdev
->badblocks
.unacked_exist
2738 && !test_bit(Faulty
, &flags
)))
2739 len
+= sprintf(page
+len
, "blocked%s", sep
);
2740 if (!test_bit(Faulty
, &flags
) &&
2741 !test_bit(Journal
, &flags
) &&
2742 !test_bit(In_sync
, &flags
))
2743 len
+= sprintf(page
+len
, "spare%s", sep
);
2744 if (test_bit(WriteErrorSeen
, &flags
))
2745 len
+= sprintf(page
+len
, "write_error%s", sep
);
2746 if (test_bit(WantReplacement
, &flags
))
2747 len
+= sprintf(page
+len
, "want_replacement%s", sep
);
2748 if (test_bit(Replacement
, &flags
))
2749 len
+= sprintf(page
+len
, "replacement%s", sep
);
2750 if (test_bit(ExternalBbl
, &flags
))
2751 len
+= sprintf(page
+len
, "external_bbl%s", sep
);
2752 if (test_bit(FailFast
, &flags
))
2753 len
+= sprintf(page
+len
, "failfast%s", sep
);
2758 return len
+sprintf(page
+len
, "\n");
2762 state_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2765 * faulty - simulates an error
2766 * remove - disconnects the device
2767 * writemostly - sets write_mostly
2768 * -writemostly - clears write_mostly
2769 * blocked - sets the Blocked flags
2770 * -blocked - clears the Blocked and possibly simulates an error
2771 * insync - sets Insync providing device isn't active
2772 * -insync - clear Insync for a device with a slot assigned,
2773 * so that it gets rebuilt based on bitmap
2774 * write_error - sets WriteErrorSeen
2775 * -write_error - clears WriteErrorSeen
2776 * {,-}failfast - set/clear FailFast
2779 if (cmd_match(buf
, "faulty") && rdev
->mddev
->pers
) {
2780 md_error(rdev
->mddev
, rdev
);
2781 if (test_bit(Faulty
, &rdev
->flags
))
2785 } else if (cmd_match(buf
, "remove")) {
2786 if (rdev
->mddev
->pers
) {
2787 clear_bit(Blocked
, &rdev
->flags
);
2788 remove_and_add_spares(rdev
->mddev
, rdev
);
2790 if (rdev
->raid_disk
>= 0)
2793 struct mddev
*mddev
= rdev
->mddev
;
2795 if (mddev_is_clustered(mddev
))
2796 err
= md_cluster_ops
->remove_disk(mddev
, rdev
);
2799 md_kick_rdev_from_array(rdev
);
2801 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
2802 md_wakeup_thread(mddev
->thread
);
2804 md_new_event(mddev
);
2807 } else if (cmd_match(buf
, "writemostly")) {
2808 set_bit(WriteMostly
, &rdev
->flags
);
2810 } else if (cmd_match(buf
, "-writemostly")) {
2811 clear_bit(WriteMostly
, &rdev
->flags
);
2813 } else if (cmd_match(buf
, "blocked")) {
2814 set_bit(Blocked
, &rdev
->flags
);
2816 } else if (cmd_match(buf
, "-blocked")) {
2817 if (!test_bit(Faulty
, &rdev
->flags
) &&
2818 !test_bit(ExternalBbl
, &rdev
->flags
) &&
2819 rdev
->badblocks
.unacked_exist
) {
2820 /* metadata handler doesn't understand badblocks,
2821 * so we need to fail the device
2823 md_error(rdev
->mddev
, rdev
);
2825 clear_bit(Blocked
, &rdev
->flags
);
2826 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2827 wake_up(&rdev
->blocked_wait
);
2828 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2829 md_wakeup_thread(rdev
->mddev
->thread
);
2832 } else if (cmd_match(buf
, "insync") && rdev
->raid_disk
== -1) {
2833 set_bit(In_sync
, &rdev
->flags
);
2835 } else if (cmd_match(buf
, "failfast")) {
2836 set_bit(FailFast
, &rdev
->flags
);
2838 } else if (cmd_match(buf
, "-failfast")) {
2839 clear_bit(FailFast
, &rdev
->flags
);
2841 } else if (cmd_match(buf
, "-insync") && rdev
->raid_disk
>= 0 &&
2842 !test_bit(Journal
, &rdev
->flags
)) {
2843 if (rdev
->mddev
->pers
== NULL
) {
2844 clear_bit(In_sync
, &rdev
->flags
);
2845 rdev
->saved_raid_disk
= rdev
->raid_disk
;
2846 rdev
->raid_disk
= -1;
2849 } else if (cmd_match(buf
, "write_error")) {
2850 set_bit(WriteErrorSeen
, &rdev
->flags
);
2852 } else if (cmd_match(buf
, "-write_error")) {
2853 clear_bit(WriteErrorSeen
, &rdev
->flags
);
2855 } else if (cmd_match(buf
, "want_replacement")) {
2856 /* Any non-spare device that is not a replacement can
2857 * become want_replacement at any time, but we then need to
2858 * check if recovery is needed.
2860 if (rdev
->raid_disk
>= 0 &&
2861 !test_bit(Journal
, &rdev
->flags
) &&
2862 !test_bit(Replacement
, &rdev
->flags
))
2863 set_bit(WantReplacement
, &rdev
->flags
);
2864 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2865 md_wakeup_thread(rdev
->mddev
->thread
);
2867 } else if (cmd_match(buf
, "-want_replacement")) {
2868 /* Clearing 'want_replacement' is always allowed.
2869 * Once replacements starts it is too late though.
2872 clear_bit(WantReplacement
, &rdev
->flags
);
2873 } else if (cmd_match(buf
, "replacement")) {
2874 /* Can only set a device as a replacement when array has not
2875 * yet been started. Once running, replacement is automatic
2876 * from spares, or by assigning 'slot'.
2878 if (rdev
->mddev
->pers
)
2881 set_bit(Replacement
, &rdev
->flags
);
2884 } else if (cmd_match(buf
, "-replacement")) {
2885 /* Similarly, can only clear Replacement before start */
2886 if (rdev
->mddev
->pers
)
2889 clear_bit(Replacement
, &rdev
->flags
);
2892 } else if (cmd_match(buf
, "re-add")) {
2893 if (!rdev
->mddev
->pers
)
2895 else if (test_bit(Faulty
, &rdev
->flags
) && (rdev
->raid_disk
== -1) &&
2896 rdev
->saved_raid_disk
>= 0) {
2897 /* clear_bit is performed _after_ all the devices
2898 * have their local Faulty bit cleared. If any writes
2899 * happen in the meantime in the local node, they
2900 * will land in the local bitmap, which will be synced
2901 * by this node eventually
2903 if (!mddev_is_clustered(rdev
->mddev
) ||
2904 (err
= md_cluster_ops
->gather_bitmaps(rdev
)) == 0) {
2905 clear_bit(Faulty
, &rdev
->flags
);
2906 err
= add_bound_rdev(rdev
);
2910 } else if (cmd_match(buf
, "external_bbl") && (rdev
->mddev
->external
)) {
2911 set_bit(ExternalBbl
, &rdev
->flags
);
2912 rdev
->badblocks
.shift
= 0;
2914 } else if (cmd_match(buf
, "-external_bbl") && (rdev
->mddev
->external
)) {
2915 clear_bit(ExternalBbl
, &rdev
->flags
);
2919 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2920 return err
? err
: len
;
2922 static struct rdev_sysfs_entry rdev_state
=
2923 __ATTR_PREALLOC(state
, S_IRUGO
|S_IWUSR
, state_show
, state_store
);
2926 errors_show(struct md_rdev
*rdev
, char *page
)
2928 return sprintf(page
, "%d\n", atomic_read(&rdev
->corrected_errors
));
2932 errors_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2937 rv
= kstrtouint(buf
, 10, &n
);
2940 atomic_set(&rdev
->corrected_errors
, n
);
2943 static struct rdev_sysfs_entry rdev_errors
=
2944 __ATTR(errors
, S_IRUGO
|S_IWUSR
, errors_show
, errors_store
);
2947 slot_show(struct md_rdev
*rdev
, char *page
)
2949 if (test_bit(Journal
, &rdev
->flags
))
2950 return sprintf(page
, "journal\n");
2951 else if (rdev
->raid_disk
< 0)
2952 return sprintf(page
, "none\n");
2954 return sprintf(page
, "%d\n", rdev
->raid_disk
);
2958 slot_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2963 if (test_bit(Journal
, &rdev
->flags
))
2965 if (strncmp(buf
, "none", 4)==0)
2968 err
= kstrtouint(buf
, 10, (unsigned int *)&slot
);
2972 if (rdev
->mddev
->pers
&& slot
== -1) {
2973 /* Setting 'slot' on an active array requires also
2974 * updating the 'rd%d' link, and communicating
2975 * with the personality with ->hot_*_disk.
2976 * For now we only support removing
2977 * failed/spare devices. This normally happens automatically,
2978 * but not when the metadata is externally managed.
2980 if (rdev
->raid_disk
== -1)
2982 /* personality does all needed checks */
2983 if (rdev
->mddev
->pers
->hot_remove_disk
== NULL
)
2985 clear_bit(Blocked
, &rdev
->flags
);
2986 remove_and_add_spares(rdev
->mddev
, rdev
);
2987 if (rdev
->raid_disk
>= 0)
2989 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2990 md_wakeup_thread(rdev
->mddev
->thread
);
2991 } else if (rdev
->mddev
->pers
) {
2992 /* Activating a spare .. or possibly reactivating
2993 * if we ever get bitmaps working here.
2997 if (rdev
->raid_disk
!= -1)
3000 if (test_bit(MD_RECOVERY_RUNNING
, &rdev
->mddev
->recovery
))
3003 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
3006 if (slot
>= rdev
->mddev
->raid_disks
&&
3007 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
3010 rdev
->raid_disk
= slot
;
3011 if (test_bit(In_sync
, &rdev
->flags
))
3012 rdev
->saved_raid_disk
= slot
;
3014 rdev
->saved_raid_disk
= -1;
3015 clear_bit(In_sync
, &rdev
->flags
);
3016 clear_bit(Bitmap_sync
, &rdev
->flags
);
3017 err
= rdev
->mddev
->pers
->
3018 hot_add_disk(rdev
->mddev
, rdev
);
3020 rdev
->raid_disk
= -1;
3023 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
3024 if (sysfs_link_rdev(rdev
->mddev
, rdev
))
3025 /* failure here is OK */;
3026 /* don't wakeup anyone, leave that to userspace. */
3028 if (slot
>= rdev
->mddev
->raid_disks
&&
3029 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
3031 rdev
->raid_disk
= slot
;
3032 /* assume it is working */
3033 clear_bit(Faulty
, &rdev
->flags
);
3034 clear_bit(WriteMostly
, &rdev
->flags
);
3035 set_bit(In_sync
, &rdev
->flags
);
3036 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
3041 static struct rdev_sysfs_entry rdev_slot
=
3042 __ATTR(slot
, S_IRUGO
|S_IWUSR
, slot_show
, slot_store
);
3045 offset_show(struct md_rdev
*rdev
, char *page
)
3047 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->data_offset
);
3051 offset_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3053 unsigned long long offset
;
3054 if (kstrtoull(buf
, 10, &offset
) < 0)
3056 if (rdev
->mddev
->pers
&& rdev
->raid_disk
>= 0)
3058 if (rdev
->sectors
&& rdev
->mddev
->external
)
3059 /* Must set offset before size, so overlap checks
3062 rdev
->data_offset
= offset
;
3063 rdev
->new_data_offset
= offset
;
3067 static struct rdev_sysfs_entry rdev_offset
=
3068 __ATTR(offset
, S_IRUGO
|S_IWUSR
, offset_show
, offset_store
);
3070 static ssize_t
new_offset_show(struct md_rdev
*rdev
, char *page
)
3072 return sprintf(page
, "%llu\n",
3073 (unsigned long long)rdev
->new_data_offset
);
3076 static ssize_t
new_offset_store(struct md_rdev
*rdev
,
3077 const char *buf
, size_t len
)
3079 unsigned long long new_offset
;
3080 struct mddev
*mddev
= rdev
->mddev
;
3082 if (kstrtoull(buf
, 10, &new_offset
) < 0)
3085 if (mddev
->sync_thread
||
3086 test_bit(MD_RECOVERY_RUNNING
,&mddev
->recovery
))
3088 if (new_offset
== rdev
->data_offset
)
3089 /* reset is always permitted */
3091 else if (new_offset
> rdev
->data_offset
) {
3092 /* must not push array size beyond rdev_sectors */
3093 if (new_offset
- rdev
->data_offset
3094 + mddev
->dev_sectors
> rdev
->sectors
)
3097 /* Metadata worries about other space details. */
3099 /* decreasing the offset is inconsistent with a backwards
3102 if (new_offset
< rdev
->data_offset
&&
3103 mddev
->reshape_backwards
)
3105 /* Increasing offset is inconsistent with forwards
3106 * reshape. reshape_direction should be set to
3107 * 'backwards' first.
3109 if (new_offset
> rdev
->data_offset
&&
3110 !mddev
->reshape_backwards
)
3113 if (mddev
->pers
&& mddev
->persistent
&&
3114 !super_types
[mddev
->major_version
]
3115 .allow_new_offset(rdev
, new_offset
))
3117 rdev
->new_data_offset
= new_offset
;
3118 if (new_offset
> rdev
->data_offset
)
3119 mddev
->reshape_backwards
= 1;
3120 else if (new_offset
< rdev
->data_offset
)
3121 mddev
->reshape_backwards
= 0;
3125 static struct rdev_sysfs_entry rdev_new_offset
=
3126 __ATTR(new_offset
, S_IRUGO
|S_IWUSR
, new_offset_show
, new_offset_store
);
3129 rdev_size_show(struct md_rdev
*rdev
, char *page
)
3131 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->sectors
/ 2);
3134 static int overlaps(sector_t s1
, sector_t l1
, sector_t s2
, sector_t l2
)
3136 /* check if two start/length pairs overlap */
3144 static int strict_blocks_to_sectors(const char *buf
, sector_t
*sectors
)
3146 unsigned long long blocks
;
3149 if (kstrtoull(buf
, 10, &blocks
) < 0)
3152 if (blocks
& 1ULL << (8 * sizeof(blocks
) - 1))
3153 return -EINVAL
; /* sector conversion overflow */
3156 if (new != blocks
* 2)
3157 return -EINVAL
; /* unsigned long long to sector_t overflow */
3164 rdev_size_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3166 struct mddev
*my_mddev
= rdev
->mddev
;
3167 sector_t oldsectors
= rdev
->sectors
;
3170 if (test_bit(Journal
, &rdev
->flags
))
3172 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
3174 if (rdev
->data_offset
!= rdev
->new_data_offset
)
3175 return -EINVAL
; /* too confusing */
3176 if (my_mddev
->pers
&& rdev
->raid_disk
>= 0) {
3177 if (my_mddev
->persistent
) {
3178 sectors
= super_types
[my_mddev
->major_version
].
3179 rdev_size_change(rdev
, sectors
);
3182 } else if (!sectors
)
3183 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) -
3185 if (!my_mddev
->pers
->resize
)
3186 /* Cannot change size for RAID0 or Linear etc */
3189 if (sectors
< my_mddev
->dev_sectors
)
3190 return -EINVAL
; /* component must fit device */
3192 rdev
->sectors
= sectors
;
3193 if (sectors
> oldsectors
&& my_mddev
->external
) {
3194 /* Need to check that all other rdevs with the same
3195 * ->bdev do not overlap. 'rcu' is sufficient to walk
3196 * the rdev lists safely.
3197 * This check does not provide a hard guarantee, it
3198 * just helps avoid dangerous mistakes.
3200 struct mddev
*mddev
;
3202 struct list_head
*tmp
;
3205 for_each_mddev(mddev
, tmp
) {
3206 struct md_rdev
*rdev2
;
3208 rdev_for_each(rdev2
, mddev
)
3209 if (rdev
->bdev
== rdev2
->bdev
&&
3211 overlaps(rdev
->data_offset
, rdev
->sectors
,
3224 /* Someone else could have slipped in a size
3225 * change here, but doing so is just silly.
3226 * We put oldsectors back because we *know* it is
3227 * safe, and trust userspace not to race with
3230 rdev
->sectors
= oldsectors
;
3237 static struct rdev_sysfs_entry rdev_size
=
3238 __ATTR(size
, S_IRUGO
|S_IWUSR
, rdev_size_show
, rdev_size_store
);
3240 static ssize_t
recovery_start_show(struct md_rdev
*rdev
, char *page
)
3242 unsigned long long recovery_start
= rdev
->recovery_offset
;
3244 if (test_bit(In_sync
, &rdev
->flags
) ||
3245 recovery_start
== MaxSector
)
3246 return sprintf(page
, "none\n");
3248 return sprintf(page
, "%llu\n", recovery_start
);
3251 static ssize_t
recovery_start_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3253 unsigned long long recovery_start
;
3255 if (cmd_match(buf
, "none"))
3256 recovery_start
= MaxSector
;
3257 else if (kstrtoull(buf
, 10, &recovery_start
))
3260 if (rdev
->mddev
->pers
&&
3261 rdev
->raid_disk
>= 0)
3264 rdev
->recovery_offset
= recovery_start
;
3265 if (recovery_start
== MaxSector
)
3266 set_bit(In_sync
, &rdev
->flags
);
3268 clear_bit(In_sync
, &rdev
->flags
);
3272 static struct rdev_sysfs_entry rdev_recovery_start
=
3273 __ATTR(recovery_start
, S_IRUGO
|S_IWUSR
, recovery_start_show
, recovery_start_store
);
3275 /* sysfs access to bad-blocks list.
3276 * We present two files.
3277 * 'bad-blocks' lists sector numbers and lengths of ranges that
3278 * are recorded as bad. The list is truncated to fit within
3279 * the one-page limit of sysfs.
3280 * Writing "sector length" to this file adds an acknowledged
3282 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
3283 * been acknowledged. Writing to this file adds bad blocks
3284 * without acknowledging them. This is largely for testing.
3286 static ssize_t
bb_show(struct md_rdev
*rdev
, char *page
)
3288 return badblocks_show(&rdev
->badblocks
, page
, 0);
3290 static ssize_t
bb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
3292 int rv
= badblocks_store(&rdev
->badblocks
, page
, len
, 0);
3293 /* Maybe that ack was all we needed */
3294 if (test_and_clear_bit(BlockedBadBlocks
, &rdev
->flags
))
3295 wake_up(&rdev
->blocked_wait
);
3298 static struct rdev_sysfs_entry rdev_bad_blocks
=
3299 __ATTR(bad_blocks
, S_IRUGO
|S_IWUSR
, bb_show
, bb_store
);
3301 static ssize_t
ubb_show(struct md_rdev
*rdev
, char *page
)
3303 return badblocks_show(&rdev
->badblocks
, page
, 1);
3305 static ssize_t
ubb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
3307 return badblocks_store(&rdev
->badblocks
, page
, len
, 1);
3309 static struct rdev_sysfs_entry rdev_unack_bad_blocks
=
3310 __ATTR(unacknowledged_bad_blocks
, S_IRUGO
|S_IWUSR
, ubb_show
, ubb_store
);
3313 ppl_sector_show(struct md_rdev
*rdev
, char *page
)
3315 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->ppl
.sector
);
3319 ppl_sector_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3321 unsigned long long sector
;
3323 if (kstrtoull(buf
, 10, §or
) < 0)
3325 if (sector
!= (sector_t
)sector
)
3328 if (rdev
->mddev
->pers
&& test_bit(MD_HAS_PPL
, &rdev
->mddev
->flags
) &&
3329 rdev
->raid_disk
>= 0)
3332 if (rdev
->mddev
->persistent
) {
3333 if (rdev
->mddev
->major_version
== 0)
3335 if ((sector
> rdev
->sb_start
&&
3336 sector
- rdev
->sb_start
> S16_MAX
) ||
3337 (sector
< rdev
->sb_start
&&
3338 rdev
->sb_start
- sector
> -S16_MIN
))
3340 rdev
->ppl
.offset
= sector
- rdev
->sb_start
;
3341 } else if (!rdev
->mddev
->external
) {
3344 rdev
->ppl
.sector
= sector
;
3348 static struct rdev_sysfs_entry rdev_ppl_sector
=
3349 __ATTR(ppl_sector
, S_IRUGO
|S_IWUSR
, ppl_sector_show
, ppl_sector_store
);
3352 ppl_size_show(struct md_rdev
*rdev
, char *page
)
3354 return sprintf(page
, "%u\n", rdev
->ppl
.size
);
3358 ppl_size_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3362 if (kstrtouint(buf
, 10, &size
) < 0)
3365 if (rdev
->mddev
->pers
&& test_bit(MD_HAS_PPL
, &rdev
->mddev
->flags
) &&
3366 rdev
->raid_disk
>= 0)
3369 if (rdev
->mddev
->persistent
) {
3370 if (rdev
->mddev
->major_version
== 0)
3374 } else if (!rdev
->mddev
->external
) {
3377 rdev
->ppl
.size
= size
;
3381 static struct rdev_sysfs_entry rdev_ppl_size
=
3382 __ATTR(ppl_size
, S_IRUGO
|S_IWUSR
, ppl_size_show
, ppl_size_store
);
3384 static struct attribute
*rdev_default_attrs
[] = {
3389 &rdev_new_offset
.attr
,
3391 &rdev_recovery_start
.attr
,
3392 &rdev_bad_blocks
.attr
,
3393 &rdev_unack_bad_blocks
.attr
,
3394 &rdev_ppl_sector
.attr
,
3395 &rdev_ppl_size
.attr
,
3399 rdev_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
3401 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
3402 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
3408 return entry
->show(rdev
, page
);
3412 rdev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
3413 const char *page
, size_t length
)
3415 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
3416 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
3418 struct mddev
*mddev
= rdev
->mddev
;
3422 if (!capable(CAP_SYS_ADMIN
))
3424 rv
= mddev
? mddev_lock(mddev
): -EBUSY
;
3426 if (rdev
->mddev
== NULL
)
3429 rv
= entry
->store(rdev
, page
, length
);
3430 mddev_unlock(mddev
);
3435 static void rdev_free(struct kobject
*ko
)
3437 struct md_rdev
*rdev
= container_of(ko
, struct md_rdev
, kobj
);
3440 static const struct sysfs_ops rdev_sysfs_ops
= {
3441 .show
= rdev_attr_show
,
3442 .store
= rdev_attr_store
,
3444 static struct kobj_type rdev_ktype
= {
3445 .release
= rdev_free
,
3446 .sysfs_ops
= &rdev_sysfs_ops
,
3447 .default_attrs
= rdev_default_attrs
,
3450 int md_rdev_init(struct md_rdev
*rdev
)
3453 rdev
->saved_raid_disk
= -1;
3454 rdev
->raid_disk
= -1;
3456 rdev
->data_offset
= 0;
3457 rdev
->new_data_offset
= 0;
3458 rdev
->sb_events
= 0;
3459 rdev
->last_read_error
= 0;
3460 rdev
->sb_loaded
= 0;
3461 rdev
->bb_page
= NULL
;
3462 atomic_set(&rdev
->nr_pending
, 0);
3463 atomic_set(&rdev
->read_errors
, 0);
3464 atomic_set(&rdev
->corrected_errors
, 0);
3466 INIT_LIST_HEAD(&rdev
->same_set
);
3467 init_waitqueue_head(&rdev
->blocked_wait
);
3469 /* Add space to store bad block list.
3470 * This reserves the space even on arrays where it cannot
3471 * be used - I wonder if that matters
3473 return badblocks_init(&rdev
->badblocks
, 0);
3475 EXPORT_SYMBOL_GPL(md_rdev_init
);
3477 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3479 * mark the device faulty if:
3481 * - the device is nonexistent (zero size)
3482 * - the device has no valid superblock
3484 * a faulty rdev _never_ has rdev->sb set.
3486 static struct md_rdev
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
3488 char b
[BDEVNAME_SIZE
];
3490 struct md_rdev
*rdev
;
3493 rdev
= kzalloc(sizeof(*rdev
), GFP_KERNEL
);
3495 return ERR_PTR(-ENOMEM
);
3497 err
= md_rdev_init(rdev
);
3500 err
= alloc_disk_sb(rdev
);
3504 err
= lock_rdev(rdev
, newdev
, super_format
== -2);
3508 kobject_init(&rdev
->kobj
, &rdev_ktype
);
3510 size
= i_size_read(rdev
->bdev
->bd_inode
) >> BLOCK_SIZE_BITS
;
3512 pr_warn("md: %s has zero or unknown size, marking faulty!\n",
3513 bdevname(rdev
->bdev
,b
));
3518 if (super_format
>= 0) {
3519 err
= super_types
[super_format
].
3520 load_super(rdev
, NULL
, super_minor
);
3521 if (err
== -EINVAL
) {
3522 pr_warn("md: %s does not have a valid v%d.%d superblock, not importing!\n",
3523 bdevname(rdev
->bdev
,b
),
3524 super_format
, super_minor
);
3528 pr_warn("md: could not read %s's sb, not importing!\n",
3529 bdevname(rdev
->bdev
,b
));
3539 md_rdev_clear(rdev
);
3541 return ERR_PTR(err
);
3545 * Check a full RAID array for plausibility
3548 static void analyze_sbs(struct mddev
*mddev
)
3551 struct md_rdev
*rdev
, *freshest
, *tmp
;
3552 char b
[BDEVNAME_SIZE
];
3555 rdev_for_each_safe(rdev
, tmp
, mddev
)
3556 switch (super_types
[mddev
->major_version
].
3557 load_super(rdev
, freshest
, mddev
->minor_version
)) {
3564 pr_warn("md: fatal superblock inconsistency in %s -- removing from array\n",
3565 bdevname(rdev
->bdev
,b
));
3566 md_kick_rdev_from_array(rdev
);
3569 super_types
[mddev
->major_version
].
3570 validate_super(mddev
, freshest
);
3573 rdev_for_each_safe(rdev
, tmp
, mddev
) {
3574 if (mddev
->max_disks
&&
3575 (rdev
->desc_nr
>= mddev
->max_disks
||
3576 i
> mddev
->max_disks
)) {
3577 pr_warn("md: %s: %s: only %d devices permitted\n",
3578 mdname(mddev
), bdevname(rdev
->bdev
, b
),
3580 md_kick_rdev_from_array(rdev
);
3583 if (rdev
!= freshest
) {
3584 if (super_types
[mddev
->major_version
].
3585 validate_super(mddev
, rdev
)) {
3586 pr_warn("md: kicking non-fresh %s from array!\n",
3587 bdevname(rdev
->bdev
,b
));
3588 md_kick_rdev_from_array(rdev
);
3592 if (mddev
->level
== LEVEL_MULTIPATH
) {
3593 rdev
->desc_nr
= i
++;
3594 rdev
->raid_disk
= rdev
->desc_nr
;
3595 set_bit(In_sync
, &rdev
->flags
);
3596 } else if (rdev
->raid_disk
>=
3597 (mddev
->raid_disks
- min(0, mddev
->delta_disks
)) &&
3598 !test_bit(Journal
, &rdev
->flags
)) {
3599 rdev
->raid_disk
= -1;
3600 clear_bit(In_sync
, &rdev
->flags
);
3605 /* Read a fixed-point number.
3606 * Numbers in sysfs attributes should be in "standard" units where
3607 * possible, so time should be in seconds.
3608 * However we internally use a a much smaller unit such as
3609 * milliseconds or jiffies.
3610 * This function takes a decimal number with a possible fractional
3611 * component, and produces an integer which is the result of
3612 * multiplying that number by 10^'scale'.
3613 * all without any floating-point arithmetic.
3615 int strict_strtoul_scaled(const char *cp
, unsigned long *res
, int scale
)
3617 unsigned long result
= 0;
3619 while (isdigit(*cp
) || (*cp
== '.' && decimals
< 0)) {
3622 else if (decimals
< scale
) {
3625 result
= result
* 10 + value
;
3637 while (decimals
< scale
) {
3646 safe_delay_show(struct mddev
*mddev
, char *page
)
3648 int msec
= (mddev
->safemode_delay
*1000)/HZ
;
3649 return sprintf(page
, "%d.%03d\n", msec
/1000, msec
%1000);
3652 safe_delay_store(struct mddev
*mddev
, const char *cbuf
, size_t len
)
3656 if (mddev_is_clustered(mddev
)) {
3657 pr_warn("md: Safemode is disabled for clustered mode\n");
3661 if (strict_strtoul_scaled(cbuf
, &msec
, 3) < 0)
3664 mddev
->safemode_delay
= 0;
3666 unsigned long old_delay
= mddev
->safemode_delay
;
3667 unsigned long new_delay
= (msec
*HZ
)/1000;
3671 mddev
->safemode_delay
= new_delay
;
3672 if (new_delay
< old_delay
|| old_delay
== 0)
3673 mod_timer(&mddev
->safemode_timer
, jiffies
+1);
3677 static struct md_sysfs_entry md_safe_delay
=
3678 __ATTR(safe_mode_delay
, S_IRUGO
|S_IWUSR
,safe_delay_show
, safe_delay_store
);
3681 level_show(struct mddev
*mddev
, char *page
)
3683 struct md_personality
*p
;
3685 spin_lock(&mddev
->lock
);
3688 ret
= sprintf(page
, "%s\n", p
->name
);
3689 else if (mddev
->clevel
[0])
3690 ret
= sprintf(page
, "%s\n", mddev
->clevel
);
3691 else if (mddev
->level
!= LEVEL_NONE
)
3692 ret
= sprintf(page
, "%d\n", mddev
->level
);
3695 spin_unlock(&mddev
->lock
);
3700 level_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3705 struct md_personality
*pers
, *oldpers
;
3707 void *priv
, *oldpriv
;
3708 struct md_rdev
*rdev
;
3710 if (slen
== 0 || slen
>= sizeof(clevel
))
3713 rv
= mddev_lock(mddev
);
3717 if (mddev
->pers
== NULL
) {
3718 strncpy(mddev
->clevel
, buf
, slen
);
3719 if (mddev
->clevel
[slen
-1] == '\n')
3721 mddev
->clevel
[slen
] = 0;
3722 mddev
->level
= LEVEL_NONE
;
3730 /* request to change the personality. Need to ensure:
3731 * - array is not engaged in resync/recovery/reshape
3732 * - old personality can be suspended
3733 * - new personality will access other array.
3737 if (mddev
->sync_thread
||
3738 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
3739 mddev
->reshape_position
!= MaxSector
||
3740 mddev
->sysfs_active
)
3744 if (!mddev
->pers
->quiesce
) {
3745 pr_warn("md: %s: %s does not support online personality change\n",
3746 mdname(mddev
), mddev
->pers
->name
);
3750 /* Now find the new personality */
3751 strncpy(clevel
, buf
, slen
);
3752 if (clevel
[slen
-1] == '\n')
3755 if (kstrtol(clevel
, 10, &level
))
3758 if (request_module("md-%s", clevel
) != 0)
3759 request_module("md-level-%s", clevel
);
3760 spin_lock(&pers_lock
);
3761 pers
= find_pers(level
, clevel
);
3762 if (!pers
|| !try_module_get(pers
->owner
)) {
3763 spin_unlock(&pers_lock
);
3764 pr_warn("md: personality %s not loaded\n", clevel
);
3768 spin_unlock(&pers_lock
);
3770 if (pers
== mddev
->pers
) {
3771 /* Nothing to do! */
3772 module_put(pers
->owner
);
3776 if (!pers
->takeover
) {
3777 module_put(pers
->owner
);
3778 pr_warn("md: %s: %s does not support personality takeover\n",
3779 mdname(mddev
), clevel
);
3784 rdev_for_each(rdev
, mddev
)
3785 rdev
->new_raid_disk
= rdev
->raid_disk
;
3787 /* ->takeover must set new_* and/or delta_disks
3788 * if it succeeds, and may set them when it fails.
3790 priv
= pers
->takeover(mddev
);
3792 mddev
->new_level
= mddev
->level
;
3793 mddev
->new_layout
= mddev
->layout
;
3794 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3795 mddev
->raid_disks
-= mddev
->delta_disks
;
3796 mddev
->delta_disks
= 0;
3797 mddev
->reshape_backwards
= 0;
3798 module_put(pers
->owner
);
3799 pr_warn("md: %s: %s would not accept array\n",
3800 mdname(mddev
), clevel
);
3805 /* Looks like we have a winner */
3806 mddev_suspend(mddev
);
3807 mddev_detach(mddev
);
3809 spin_lock(&mddev
->lock
);
3810 oldpers
= mddev
->pers
;
3811 oldpriv
= mddev
->private;
3813 mddev
->private = priv
;
3814 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
3815 mddev
->level
= mddev
->new_level
;
3816 mddev
->layout
= mddev
->new_layout
;
3817 mddev
->chunk_sectors
= mddev
->new_chunk_sectors
;
3818 mddev
->delta_disks
= 0;
3819 mddev
->reshape_backwards
= 0;
3820 mddev
->degraded
= 0;
3821 spin_unlock(&mddev
->lock
);
3823 if (oldpers
->sync_request
== NULL
&&
3825 /* We are converting from a no-redundancy array
3826 * to a redundancy array and metadata is managed
3827 * externally so we need to be sure that writes
3828 * won't block due to a need to transition
3830 * until external management is started.
3833 mddev
->safemode_delay
= 0;
3834 mddev
->safemode
= 0;
3837 oldpers
->free(mddev
, oldpriv
);
3839 if (oldpers
->sync_request
== NULL
&&
3840 pers
->sync_request
!= NULL
) {
3841 /* need to add the md_redundancy_group */
3842 if (sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
3843 pr_warn("md: cannot register extra attributes for %s\n",
3845 mddev
->sysfs_action
= sysfs_get_dirent(mddev
->kobj
.sd
, "sync_action");
3847 if (oldpers
->sync_request
!= NULL
&&
3848 pers
->sync_request
== NULL
) {
3849 /* need to remove the md_redundancy_group */
3850 if (mddev
->to_remove
== NULL
)
3851 mddev
->to_remove
= &md_redundancy_group
;
3854 module_put(oldpers
->owner
);
3856 rdev_for_each(rdev
, mddev
) {
3857 if (rdev
->raid_disk
< 0)
3859 if (rdev
->new_raid_disk
>= mddev
->raid_disks
)
3860 rdev
->new_raid_disk
= -1;
3861 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3863 sysfs_unlink_rdev(mddev
, rdev
);
3865 rdev_for_each(rdev
, mddev
) {
3866 if (rdev
->raid_disk
< 0)
3868 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3870 rdev
->raid_disk
= rdev
->new_raid_disk
;
3871 if (rdev
->raid_disk
< 0)
3872 clear_bit(In_sync
, &rdev
->flags
);
3874 if (sysfs_link_rdev(mddev
, rdev
))
3875 pr_warn("md: cannot register rd%d for %s after level change\n",
3876 rdev
->raid_disk
, mdname(mddev
));
3880 if (pers
->sync_request
== NULL
) {
3881 /* this is now an array without redundancy, so
3882 * it must always be in_sync
3885 del_timer_sync(&mddev
->safemode_timer
);
3887 blk_set_stacking_limits(&mddev
->queue
->limits
);
3889 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
3890 mddev_resume(mddev
);
3892 md_update_sb(mddev
, 1);
3893 sysfs_notify(&mddev
->kobj
, NULL
, "level");
3894 md_new_event(mddev
);
3897 mddev_unlock(mddev
);
3901 static struct md_sysfs_entry md_level
=
3902 __ATTR(level
, S_IRUGO
|S_IWUSR
, level_show
, level_store
);
3905 layout_show(struct mddev
*mddev
, char *page
)
3907 /* just a number, not meaningful for all levels */
3908 if (mddev
->reshape_position
!= MaxSector
&&
3909 mddev
->layout
!= mddev
->new_layout
)
3910 return sprintf(page
, "%d (%d)\n",
3911 mddev
->new_layout
, mddev
->layout
);
3912 return sprintf(page
, "%d\n", mddev
->layout
);
3916 layout_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3921 err
= kstrtouint(buf
, 10, &n
);
3924 err
= mddev_lock(mddev
);
3929 if (mddev
->pers
->check_reshape
== NULL
)
3934 mddev
->new_layout
= n
;
3935 err
= mddev
->pers
->check_reshape(mddev
);
3937 mddev
->new_layout
= mddev
->layout
;
3940 mddev
->new_layout
= n
;
3941 if (mddev
->reshape_position
== MaxSector
)
3944 mddev_unlock(mddev
);
3947 static struct md_sysfs_entry md_layout
=
3948 __ATTR(layout
, S_IRUGO
|S_IWUSR
, layout_show
, layout_store
);
3951 raid_disks_show(struct mddev
*mddev
, char *page
)
3953 if (mddev
->raid_disks
== 0)
3955 if (mddev
->reshape_position
!= MaxSector
&&
3956 mddev
->delta_disks
!= 0)
3957 return sprintf(page
, "%d (%d)\n", mddev
->raid_disks
,
3958 mddev
->raid_disks
- mddev
->delta_disks
);
3959 return sprintf(page
, "%d\n", mddev
->raid_disks
);
3962 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
);
3965 raid_disks_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3970 err
= kstrtouint(buf
, 10, &n
);
3974 err
= mddev_lock(mddev
);
3978 err
= update_raid_disks(mddev
, n
);
3979 else if (mddev
->reshape_position
!= MaxSector
) {
3980 struct md_rdev
*rdev
;
3981 int olddisks
= mddev
->raid_disks
- mddev
->delta_disks
;
3984 rdev_for_each(rdev
, mddev
) {
3986 rdev
->data_offset
< rdev
->new_data_offset
)
3989 rdev
->data_offset
> rdev
->new_data_offset
)
3993 mddev
->delta_disks
= n
- olddisks
;
3994 mddev
->raid_disks
= n
;
3995 mddev
->reshape_backwards
= (mddev
->delta_disks
< 0);
3997 mddev
->raid_disks
= n
;
3999 mddev_unlock(mddev
);
4000 return err
? err
: len
;
4002 static struct md_sysfs_entry md_raid_disks
=
4003 __ATTR(raid_disks
, S_IRUGO
|S_IWUSR
, raid_disks_show
, raid_disks_store
);
4006 chunk_size_show(struct mddev
*mddev
, char *page
)
4008 if (mddev
->reshape_position
!= MaxSector
&&
4009 mddev
->chunk_sectors
!= mddev
->new_chunk_sectors
)
4010 return sprintf(page
, "%d (%d)\n",
4011 mddev
->new_chunk_sectors
<< 9,
4012 mddev
->chunk_sectors
<< 9);
4013 return sprintf(page
, "%d\n", mddev
->chunk_sectors
<< 9);
4017 chunk_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4022 err
= kstrtoul(buf
, 10, &n
);
4026 err
= mddev_lock(mddev
);
4030 if (mddev
->pers
->check_reshape
== NULL
)
4035 mddev
->new_chunk_sectors
= n
>> 9;
4036 err
= mddev
->pers
->check_reshape(mddev
);
4038 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
4041 mddev
->new_chunk_sectors
= n
>> 9;
4042 if (mddev
->reshape_position
== MaxSector
)
4043 mddev
->chunk_sectors
= n
>> 9;
4045 mddev_unlock(mddev
);
4048 static struct md_sysfs_entry md_chunk_size
=
4049 __ATTR(chunk_size
, S_IRUGO
|S_IWUSR
, chunk_size_show
, chunk_size_store
);
4052 resync_start_show(struct mddev
*mddev
, char *page
)
4054 if (mddev
->recovery_cp
== MaxSector
)
4055 return sprintf(page
, "none\n");
4056 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->recovery_cp
);
4060 resync_start_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4062 unsigned long long n
;
4065 if (cmd_match(buf
, "none"))
4068 err
= kstrtoull(buf
, 10, &n
);
4071 if (n
!= (sector_t
)n
)
4075 err
= mddev_lock(mddev
);
4078 if (mddev
->pers
&& !test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
4082 mddev
->recovery_cp
= n
;
4084 set_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
4086 mddev_unlock(mddev
);
4089 static struct md_sysfs_entry md_resync_start
=
4090 __ATTR_PREALLOC(resync_start
, S_IRUGO
|S_IWUSR
,
4091 resync_start_show
, resync_start_store
);
4094 * The array state can be:
4097 * No devices, no size, no level
4098 * Equivalent to STOP_ARRAY ioctl
4100 * May have some settings, but array is not active
4101 * all IO results in error
4102 * When written, doesn't tear down array, but just stops it
4103 * suspended (not supported yet)
4104 * All IO requests will block. The array can be reconfigured.
4105 * Writing this, if accepted, will block until array is quiescent
4107 * no resync can happen. no superblocks get written.
4108 * write requests fail
4110 * like readonly, but behaves like 'clean' on a write request.
4112 * clean - no pending writes, but otherwise active.
4113 * When written to inactive array, starts without resync
4114 * If a write request arrives then
4115 * if metadata is known, mark 'dirty' and switch to 'active'.
4116 * if not known, block and switch to write-pending
4117 * If written to an active array that has pending writes, then fails.
4119 * fully active: IO and resync can be happening.
4120 * When written to inactive array, starts with resync
4123 * clean, but writes are blocked waiting for 'active' to be written.
4126 * like active, but no writes have been seen for a while (100msec).
4129 * RAID0/LINEAR-only: same as clean, but array is missing a member.
4130 * It's useful because RAID0/LINEAR mounted-arrays aren't stopped
4131 * when a member is gone, so this state will at least alert the
4132 * user that something is wrong.
4134 enum array_state
{ clear
, inactive
, suspended
, readonly
, read_auto
, clean
, active
,
4135 write_pending
, active_idle
, broken
, bad_word
};
4136 static char *array_states
[] = {
4137 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
4138 "write-pending", "active-idle", "broken", NULL
};
4140 static int match_word(const char *word
, char **list
)
4143 for (n
=0; list
[n
]; n
++)
4144 if (cmd_match(word
, list
[n
]))
4150 array_state_show(struct mddev
*mddev
, char *page
)
4152 enum array_state st
= inactive
;
4154 if (mddev
->pers
&& !test_bit(MD_NOT_READY
, &mddev
->flags
)) {
4163 spin_lock(&mddev
->lock
);
4164 if (test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
))
4166 else if (mddev
->in_sync
)
4168 else if (mddev
->safemode
)
4172 spin_unlock(&mddev
->lock
);
4175 if (test_bit(MD_BROKEN
, &mddev
->flags
) && st
== clean
)
4178 if (list_empty(&mddev
->disks
) &&
4179 mddev
->raid_disks
== 0 &&
4180 mddev
->dev_sectors
== 0)
4185 return sprintf(page
, "%s\n", array_states
[st
]);
4188 static int do_md_stop(struct mddev
*mddev
, int ro
, struct block_device
*bdev
);
4189 static int md_set_readonly(struct mddev
*mddev
, struct block_device
*bdev
);
4190 static int do_md_run(struct mddev
*mddev
);
4191 static int restart_array(struct mddev
*mddev
);
4194 array_state_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4197 enum array_state st
= match_word(buf
, array_states
);
4199 if (mddev
->pers
&& (st
== active
|| st
== clean
) && mddev
->ro
!= 1) {
4200 /* don't take reconfig_mutex when toggling between
4203 spin_lock(&mddev
->lock
);
4205 restart_array(mddev
);
4206 clear_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
4207 md_wakeup_thread(mddev
->thread
);
4208 wake_up(&mddev
->sb_wait
);
4209 } else /* st == clean */ {
4210 restart_array(mddev
);
4211 if (!set_in_sync(mddev
))
4215 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4216 spin_unlock(&mddev
->lock
);
4219 err
= mddev_lock(mddev
);
4227 /* stopping an active array */
4228 err
= do_md_stop(mddev
, 0, NULL
);
4231 /* stopping an active array */
4233 err
= do_md_stop(mddev
, 2, NULL
);
4235 err
= 0; /* already inactive */
4238 break; /* not supported yet */
4241 err
= md_set_readonly(mddev
, NULL
);
4244 set_disk_ro(mddev
->gendisk
, 1);
4245 err
= do_md_run(mddev
);
4251 err
= md_set_readonly(mddev
, NULL
);
4252 else if (mddev
->ro
== 1)
4253 err
= restart_array(mddev
);
4256 set_disk_ro(mddev
->gendisk
, 0);
4260 err
= do_md_run(mddev
);
4265 err
= restart_array(mddev
);
4268 spin_lock(&mddev
->lock
);
4269 if (!set_in_sync(mddev
))
4271 spin_unlock(&mddev
->lock
);
4277 err
= restart_array(mddev
);
4280 clear_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
4281 wake_up(&mddev
->sb_wait
);
4285 set_disk_ro(mddev
->gendisk
, 0);
4286 err
= do_md_run(mddev
);
4292 /* these cannot be set */
4297 if (mddev
->hold_active
== UNTIL_IOCTL
)
4298 mddev
->hold_active
= 0;
4299 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4301 mddev_unlock(mddev
);
4304 static struct md_sysfs_entry md_array_state
=
4305 __ATTR_PREALLOC(array_state
, S_IRUGO
|S_IWUSR
, array_state_show
, array_state_store
);
4308 max_corrected_read_errors_show(struct mddev
*mddev
, char *page
) {
4309 return sprintf(page
, "%d\n",
4310 atomic_read(&mddev
->max_corr_read_errors
));
4314 max_corrected_read_errors_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4319 rv
= kstrtouint(buf
, 10, &n
);
4322 atomic_set(&mddev
->max_corr_read_errors
, n
);
4326 static struct md_sysfs_entry max_corr_read_errors
=
4327 __ATTR(max_read_errors
, S_IRUGO
|S_IWUSR
, max_corrected_read_errors_show
,
4328 max_corrected_read_errors_store
);
4331 null_show(struct mddev
*mddev
, char *page
)
4337 new_dev_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4339 /* buf must be %d:%d\n? giving major and minor numbers */
4340 /* The new device is added to the array.
4341 * If the array has a persistent superblock, we read the
4342 * superblock to initialise info and check validity.
4343 * Otherwise, only checking done is that in bind_rdev_to_array,
4344 * which mainly checks size.
4347 int major
= simple_strtoul(buf
, &e
, 10);
4350 struct md_rdev
*rdev
;
4353 if (!*buf
|| *e
!= ':' || !e
[1] || e
[1] == '\n')
4355 minor
= simple_strtoul(e
+1, &e
, 10);
4356 if (*e
&& *e
!= '\n')
4358 dev
= MKDEV(major
, minor
);
4359 if (major
!= MAJOR(dev
) ||
4360 minor
!= MINOR(dev
))
4363 flush_workqueue(md_misc_wq
);
4365 err
= mddev_lock(mddev
);
4368 if (mddev
->persistent
) {
4369 rdev
= md_import_device(dev
, mddev
->major_version
,
4370 mddev
->minor_version
);
4371 if (!IS_ERR(rdev
) && !list_empty(&mddev
->disks
)) {
4372 struct md_rdev
*rdev0
4373 = list_entry(mddev
->disks
.next
,
4374 struct md_rdev
, same_set
);
4375 err
= super_types
[mddev
->major_version
]
4376 .load_super(rdev
, rdev0
, mddev
->minor_version
);
4380 } else if (mddev
->external
)
4381 rdev
= md_import_device(dev
, -2, -1);
4383 rdev
= md_import_device(dev
, -1, -1);
4386 mddev_unlock(mddev
);
4387 return PTR_ERR(rdev
);
4389 err
= bind_rdev_to_array(rdev
, mddev
);
4393 mddev_unlock(mddev
);
4395 md_new_event(mddev
);
4396 return err
? err
: len
;
4399 static struct md_sysfs_entry md_new_device
=
4400 __ATTR(new_dev
, S_IWUSR
, null_show
, new_dev_store
);
4403 bitmap_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4406 unsigned long chunk
, end_chunk
;
4409 err
= mddev_lock(mddev
);
4414 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
4416 chunk
= end_chunk
= simple_strtoul(buf
, &end
, 0);
4417 if (buf
== end
) break;
4418 if (*end
== '-') { /* range */
4420 end_chunk
= simple_strtoul(buf
, &end
, 0);
4421 if (buf
== end
) break;
4423 if (*end
&& !isspace(*end
)) break;
4424 bitmap_dirty_bits(mddev
->bitmap
, chunk
, end_chunk
);
4425 buf
= skip_spaces(end
);
4427 bitmap_unplug(mddev
->bitmap
); /* flush the bits to disk */
4429 mddev_unlock(mddev
);
4433 static struct md_sysfs_entry md_bitmap
=
4434 __ATTR(bitmap_set_bits
, S_IWUSR
, null_show
, bitmap_store
);
4437 size_show(struct mddev
*mddev
, char *page
)
4439 return sprintf(page
, "%llu\n",
4440 (unsigned long long)mddev
->dev_sectors
/ 2);
4443 static int update_size(struct mddev
*mddev
, sector_t num_sectors
);
4446 size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4448 /* If array is inactive, we can reduce the component size, but
4449 * not increase it (except from 0).
4450 * If array is active, we can try an on-line resize
4453 int err
= strict_blocks_to_sectors(buf
, §ors
);
4457 err
= mddev_lock(mddev
);
4461 err
= update_size(mddev
, sectors
);
4463 md_update_sb(mddev
, 1);
4465 if (mddev
->dev_sectors
== 0 ||
4466 mddev
->dev_sectors
> sectors
)
4467 mddev
->dev_sectors
= sectors
;
4471 mddev_unlock(mddev
);
4472 return err
? err
: len
;
4475 static struct md_sysfs_entry md_size
=
4476 __ATTR(component_size
, S_IRUGO
|S_IWUSR
, size_show
, size_store
);
4478 /* Metadata version.
4480 * 'none' for arrays with no metadata (good luck...)
4481 * 'external' for arrays with externally managed metadata,
4482 * or N.M for internally known formats
4485 metadata_show(struct mddev
*mddev
, char *page
)
4487 if (mddev
->persistent
)
4488 return sprintf(page
, "%d.%d\n",
4489 mddev
->major_version
, mddev
->minor_version
);
4490 else if (mddev
->external
)
4491 return sprintf(page
, "external:%s\n", mddev
->metadata_type
);
4493 return sprintf(page
, "none\n");
4497 metadata_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4502 /* Changing the details of 'external' metadata is
4503 * always permitted. Otherwise there must be
4504 * no devices attached to the array.
4507 err
= mddev_lock(mddev
);
4511 if (mddev
->external
&& strncmp(buf
, "external:", 9) == 0)
4513 else if (!list_empty(&mddev
->disks
))
4517 if (cmd_match(buf
, "none")) {
4518 mddev
->persistent
= 0;
4519 mddev
->external
= 0;
4520 mddev
->major_version
= 0;
4521 mddev
->minor_version
= 90;
4524 if (strncmp(buf
, "external:", 9) == 0) {
4525 size_t namelen
= len
-9;
4526 if (namelen
>= sizeof(mddev
->metadata_type
))
4527 namelen
= sizeof(mddev
->metadata_type
)-1;
4528 strncpy(mddev
->metadata_type
, buf
+9, namelen
);
4529 mddev
->metadata_type
[namelen
] = 0;
4530 if (namelen
&& mddev
->metadata_type
[namelen
-1] == '\n')
4531 mddev
->metadata_type
[--namelen
] = 0;
4532 mddev
->persistent
= 0;
4533 mddev
->external
= 1;
4534 mddev
->major_version
= 0;
4535 mddev
->minor_version
= 90;
4538 major
= simple_strtoul(buf
, &e
, 10);
4540 if (e
==buf
|| *e
!= '.')
4543 minor
= simple_strtoul(buf
, &e
, 10);
4544 if (e
==buf
|| (*e
&& *e
!= '\n') )
4547 if (major
>= ARRAY_SIZE(super_types
) || super_types
[major
].name
== NULL
)
4549 mddev
->major_version
= major
;
4550 mddev
->minor_version
= minor
;
4551 mddev
->persistent
= 1;
4552 mddev
->external
= 0;
4555 mddev_unlock(mddev
);
4559 static struct md_sysfs_entry md_metadata
=
4560 __ATTR_PREALLOC(metadata_version
, S_IRUGO
|S_IWUSR
, metadata_show
, metadata_store
);
4563 action_show(struct mddev
*mddev
, char *page
)
4565 char *type
= "idle";
4566 unsigned long recovery
= mddev
->recovery
;
4567 if (test_bit(MD_RECOVERY_FROZEN
, &recovery
))
4569 else if (test_bit(MD_RECOVERY_RUNNING
, &recovery
) ||
4570 (!mddev
->ro
&& test_bit(MD_RECOVERY_NEEDED
, &recovery
))) {
4571 if (test_bit(MD_RECOVERY_RESHAPE
, &recovery
))
4573 else if (test_bit(MD_RECOVERY_SYNC
, &recovery
)) {
4574 if (!test_bit(MD_RECOVERY_REQUESTED
, &recovery
))
4576 else if (test_bit(MD_RECOVERY_CHECK
, &recovery
))
4580 } else if (test_bit(MD_RECOVERY_RECOVER
, &recovery
))
4582 else if (mddev
->reshape_position
!= MaxSector
)
4585 return sprintf(page
, "%s\n", type
);
4589 action_store(struct mddev
*mddev
, const char *page
, size_t len
)
4591 if (!mddev
->pers
|| !mddev
->pers
->sync_request
)
4595 if (cmd_match(page
, "idle") || cmd_match(page
, "frozen")) {
4596 if (cmd_match(page
, "frozen"))
4597 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4599 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4600 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
4601 mddev_lock(mddev
) == 0) {
4602 flush_workqueue(md_misc_wq
);
4603 if (mddev
->sync_thread
) {
4604 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4605 md_reap_sync_thread(mddev
);
4607 mddev_unlock(mddev
);
4609 } else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4611 else if (cmd_match(page
, "resync"))
4612 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4613 else if (cmd_match(page
, "recover")) {
4614 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4615 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
4616 } else if (cmd_match(page
, "reshape")) {
4618 if (mddev
->pers
->start_reshape
== NULL
)
4620 err
= mddev_lock(mddev
);
4622 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4625 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4626 err
= mddev
->pers
->start_reshape(mddev
);
4628 mddev_unlock(mddev
);
4632 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
4634 if (cmd_match(page
, "check"))
4635 set_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
4636 else if (!cmd_match(page
, "repair"))
4638 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4639 set_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
4640 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
4642 if (mddev
->ro
== 2) {
4643 /* A write to sync_action is enough to justify
4644 * canceling read-auto mode
4647 md_wakeup_thread(mddev
->sync_thread
);
4649 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4650 md_wakeup_thread(mddev
->thread
);
4651 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
4655 static struct md_sysfs_entry md_scan_mode
=
4656 __ATTR_PREALLOC(sync_action
, S_IRUGO
|S_IWUSR
, action_show
, action_store
);
4659 last_sync_action_show(struct mddev
*mddev
, char *page
)
4661 return sprintf(page
, "%s\n", mddev
->last_sync_action
);
4664 static struct md_sysfs_entry md_last_scan_mode
= __ATTR_RO(last_sync_action
);
4667 mismatch_cnt_show(struct mddev
*mddev
, char *page
)
4669 return sprintf(page
, "%llu\n",
4670 (unsigned long long)
4671 atomic64_read(&mddev
->resync_mismatches
));
4674 static struct md_sysfs_entry md_mismatches
= __ATTR_RO(mismatch_cnt
);
4677 sync_min_show(struct mddev
*mddev
, char *page
)
4679 return sprintf(page
, "%d (%s)\n", speed_min(mddev
),
4680 mddev
->sync_speed_min
? "local": "system");
4684 sync_min_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4689 if (strncmp(buf
, "system", 6)==0) {
4692 rv
= kstrtouint(buf
, 10, &min
);
4698 mddev
->sync_speed_min
= min
;
4702 static struct md_sysfs_entry md_sync_min
=
4703 __ATTR(sync_speed_min
, S_IRUGO
|S_IWUSR
, sync_min_show
, sync_min_store
);
4706 sync_max_show(struct mddev
*mddev
, char *page
)
4708 return sprintf(page
, "%d (%s)\n", speed_max(mddev
),
4709 mddev
->sync_speed_max
? "local": "system");
4713 sync_max_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4718 if (strncmp(buf
, "system", 6)==0) {
4721 rv
= kstrtouint(buf
, 10, &max
);
4727 mddev
->sync_speed_max
= max
;
4731 static struct md_sysfs_entry md_sync_max
=
4732 __ATTR(sync_speed_max
, S_IRUGO
|S_IWUSR
, sync_max_show
, sync_max_store
);
4735 degraded_show(struct mddev
*mddev
, char *page
)
4737 return sprintf(page
, "%d\n", mddev
->degraded
);
4739 static struct md_sysfs_entry md_degraded
= __ATTR_RO(degraded
);
4742 sync_force_parallel_show(struct mddev
*mddev
, char *page
)
4744 return sprintf(page
, "%d\n", mddev
->parallel_resync
);
4748 sync_force_parallel_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4752 if (kstrtol(buf
, 10, &n
))
4755 if (n
!= 0 && n
!= 1)
4758 mddev
->parallel_resync
= n
;
4760 if (mddev
->sync_thread
)
4761 wake_up(&resync_wait
);
4766 /* force parallel resync, even with shared block devices */
4767 static struct md_sysfs_entry md_sync_force_parallel
=
4768 __ATTR(sync_force_parallel
, S_IRUGO
|S_IWUSR
,
4769 sync_force_parallel_show
, sync_force_parallel_store
);
4772 sync_speed_show(struct mddev
*mddev
, char *page
)
4774 unsigned long resync
, dt
, db
;
4775 if (mddev
->curr_resync
== 0)
4776 return sprintf(page
, "none\n");
4777 resync
= mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
);
4778 dt
= (jiffies
- mddev
->resync_mark
) / HZ
;
4780 db
= resync
- mddev
->resync_mark_cnt
;
4781 return sprintf(page
, "%lu\n", db
/dt
/2); /* K/sec */
4784 static struct md_sysfs_entry md_sync_speed
= __ATTR_RO(sync_speed
);
4787 sync_completed_show(struct mddev
*mddev
, char *page
)
4789 unsigned long long max_sectors
, resync
;
4791 if (!test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4792 return sprintf(page
, "none\n");
4794 if (mddev
->curr_resync
== 1 ||
4795 mddev
->curr_resync
== 2)
4796 return sprintf(page
, "delayed\n");
4798 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
4799 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
4800 max_sectors
= mddev
->resync_max_sectors
;
4802 max_sectors
= mddev
->dev_sectors
;
4804 resync
= mddev
->curr_resync_completed
;
4805 return sprintf(page
, "%llu / %llu\n", resync
, max_sectors
);
4808 static struct md_sysfs_entry md_sync_completed
=
4809 __ATTR_PREALLOC(sync_completed
, S_IRUGO
, sync_completed_show
, NULL
);
4812 min_sync_show(struct mddev
*mddev
, char *page
)
4814 return sprintf(page
, "%llu\n",
4815 (unsigned long long)mddev
->resync_min
);
4818 min_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4820 unsigned long long min
;
4823 if (kstrtoull(buf
, 10, &min
))
4826 spin_lock(&mddev
->lock
);
4828 if (min
> mddev
->resync_max
)
4832 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4835 /* Round down to multiple of 4K for safety */
4836 mddev
->resync_min
= round_down(min
, 8);
4840 spin_unlock(&mddev
->lock
);
4844 static struct md_sysfs_entry md_min_sync
=
4845 __ATTR(sync_min
, S_IRUGO
|S_IWUSR
, min_sync_show
, min_sync_store
);
4848 max_sync_show(struct mddev
*mddev
, char *page
)
4850 if (mddev
->resync_max
== MaxSector
)
4851 return sprintf(page
, "max\n");
4853 return sprintf(page
, "%llu\n",
4854 (unsigned long long)mddev
->resync_max
);
4857 max_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4860 spin_lock(&mddev
->lock
);
4861 if (strncmp(buf
, "max", 3) == 0)
4862 mddev
->resync_max
= MaxSector
;
4864 unsigned long long max
;
4868 if (kstrtoull(buf
, 10, &max
))
4870 if (max
< mddev
->resync_min
)
4874 if (max
< mddev
->resync_max
&&
4876 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4879 /* Must be a multiple of chunk_size */
4880 chunk
= mddev
->chunk_sectors
;
4882 sector_t temp
= max
;
4885 if (sector_div(temp
, chunk
))
4888 mddev
->resync_max
= max
;
4890 wake_up(&mddev
->recovery_wait
);
4893 spin_unlock(&mddev
->lock
);
4897 static struct md_sysfs_entry md_max_sync
=
4898 __ATTR(sync_max
, S_IRUGO
|S_IWUSR
, max_sync_show
, max_sync_store
);
4901 suspend_lo_show(struct mddev
*mddev
, char *page
)
4903 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_lo
);
4907 suspend_lo_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4909 unsigned long long new;
4912 err
= kstrtoull(buf
, 10, &new);
4915 if (new != (sector_t
)new)
4918 err
= mddev_lock(mddev
);
4922 if (mddev
->pers
== NULL
||
4923 mddev
->pers
->quiesce
== NULL
)
4925 mddev_suspend(mddev
);
4926 mddev
->suspend_lo
= new;
4927 mddev_resume(mddev
);
4931 mddev_unlock(mddev
);
4934 static struct md_sysfs_entry md_suspend_lo
=
4935 __ATTR(suspend_lo
, S_IRUGO
|S_IWUSR
, suspend_lo_show
, suspend_lo_store
);
4938 suspend_hi_show(struct mddev
*mddev
, char *page
)
4940 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_hi
);
4944 suspend_hi_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4946 unsigned long long new;
4949 err
= kstrtoull(buf
, 10, &new);
4952 if (new != (sector_t
)new)
4955 err
= mddev_lock(mddev
);
4959 if (mddev
->pers
== NULL
)
4962 mddev_suspend(mddev
);
4963 mddev
->suspend_hi
= new;
4964 mddev_resume(mddev
);
4968 mddev_unlock(mddev
);
4971 static struct md_sysfs_entry md_suspend_hi
=
4972 __ATTR(suspend_hi
, S_IRUGO
|S_IWUSR
, suspend_hi_show
, suspend_hi_store
);
4975 reshape_position_show(struct mddev
*mddev
, char *page
)
4977 if (mddev
->reshape_position
!= MaxSector
)
4978 return sprintf(page
, "%llu\n",
4979 (unsigned long long)mddev
->reshape_position
);
4980 strcpy(page
, "none\n");
4985 reshape_position_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4987 struct md_rdev
*rdev
;
4988 unsigned long long new;
4991 err
= kstrtoull(buf
, 10, &new);
4994 if (new != (sector_t
)new)
4996 err
= mddev_lock(mddev
);
5002 mddev
->reshape_position
= new;
5003 mddev
->delta_disks
= 0;
5004 mddev
->reshape_backwards
= 0;
5005 mddev
->new_level
= mddev
->level
;
5006 mddev
->new_layout
= mddev
->layout
;
5007 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
5008 rdev_for_each(rdev
, mddev
)
5009 rdev
->new_data_offset
= rdev
->data_offset
;
5012 mddev_unlock(mddev
);
5016 static struct md_sysfs_entry md_reshape_position
=
5017 __ATTR(reshape_position
, S_IRUGO
|S_IWUSR
, reshape_position_show
,
5018 reshape_position_store
);
5021 reshape_direction_show(struct mddev
*mddev
, char *page
)
5023 return sprintf(page
, "%s\n",
5024 mddev
->reshape_backwards
? "backwards" : "forwards");
5028 reshape_direction_store(struct mddev
*mddev
, const char *buf
, size_t len
)
5033 if (cmd_match(buf
, "forwards"))
5035 else if (cmd_match(buf
, "backwards"))
5039 if (mddev
->reshape_backwards
== backwards
)
5042 err
= mddev_lock(mddev
);
5045 /* check if we are allowed to change */
5046 if (mddev
->delta_disks
)
5048 else if (mddev
->persistent
&&
5049 mddev
->major_version
== 0)
5052 mddev
->reshape_backwards
= backwards
;
5053 mddev_unlock(mddev
);
5057 static struct md_sysfs_entry md_reshape_direction
=
5058 __ATTR(reshape_direction
, S_IRUGO
|S_IWUSR
, reshape_direction_show
,
5059 reshape_direction_store
);
5062 array_size_show(struct mddev
*mddev
, char *page
)
5064 if (mddev
->external_size
)
5065 return sprintf(page
, "%llu\n",
5066 (unsigned long long)mddev
->array_sectors
/2);
5068 return sprintf(page
, "default\n");
5072 array_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
5077 err
= mddev_lock(mddev
);
5081 /* cluster raid doesn't support change array_sectors */
5082 if (mddev_is_clustered(mddev
)) {
5083 mddev_unlock(mddev
);
5087 if (strncmp(buf
, "default", 7) == 0) {
5089 sectors
= mddev
->pers
->size(mddev
, 0, 0);
5091 sectors
= mddev
->array_sectors
;
5093 mddev
->external_size
= 0;
5095 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
5097 else if (mddev
->pers
&& mddev
->pers
->size(mddev
, 0, 0) < sectors
)
5100 mddev
->external_size
= 1;
5104 mddev
->array_sectors
= sectors
;
5106 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
5107 revalidate_disk(mddev
->gendisk
);
5110 mddev_unlock(mddev
);
5114 static struct md_sysfs_entry md_array_size
=
5115 __ATTR(array_size
, S_IRUGO
|S_IWUSR
, array_size_show
,
5119 consistency_policy_show(struct mddev
*mddev
, char *page
)
5123 if (test_bit(MD_HAS_JOURNAL
, &mddev
->flags
)) {
5124 ret
= sprintf(page
, "journal\n");
5125 } else if (test_bit(MD_HAS_PPL
, &mddev
->flags
)) {
5126 ret
= sprintf(page
, "ppl\n");
5127 } else if (mddev
->bitmap
) {
5128 ret
= sprintf(page
, "bitmap\n");
5129 } else if (mddev
->pers
) {
5130 if (mddev
->pers
->sync_request
)
5131 ret
= sprintf(page
, "resync\n");
5133 ret
= sprintf(page
, "none\n");
5135 ret
= sprintf(page
, "unknown\n");
5142 consistency_policy_store(struct mddev
*mddev
, const char *buf
, size_t len
)
5147 if (mddev
->pers
->change_consistency_policy
)
5148 err
= mddev
->pers
->change_consistency_policy(mddev
, buf
);
5151 } else if (mddev
->external
&& strncmp(buf
, "ppl", 3) == 0) {
5152 set_bit(MD_HAS_PPL
, &mddev
->flags
);
5157 return err
? err
: len
;
5160 static struct md_sysfs_entry md_consistency_policy
=
5161 __ATTR(consistency_policy
, S_IRUGO
| S_IWUSR
, consistency_policy_show
,
5162 consistency_policy_store
);
5164 static struct attribute
*md_default_attrs
[] = {
5167 &md_raid_disks
.attr
,
5168 &md_chunk_size
.attr
,
5170 &md_resync_start
.attr
,
5172 &md_new_device
.attr
,
5173 &md_safe_delay
.attr
,
5174 &md_array_state
.attr
,
5175 &md_reshape_position
.attr
,
5176 &md_reshape_direction
.attr
,
5177 &md_array_size
.attr
,
5178 &max_corr_read_errors
.attr
,
5179 &md_consistency_policy
.attr
,
5183 static struct attribute
*md_redundancy_attrs
[] = {
5185 &md_last_scan_mode
.attr
,
5186 &md_mismatches
.attr
,
5189 &md_sync_speed
.attr
,
5190 &md_sync_force_parallel
.attr
,
5191 &md_sync_completed
.attr
,
5194 &md_suspend_lo
.attr
,
5195 &md_suspend_hi
.attr
,
5200 static struct attribute_group md_redundancy_group
= {
5202 .attrs
= md_redundancy_attrs
,
5206 md_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
5208 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
5209 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
5214 spin_lock(&all_mddevs_lock
);
5215 if (list_empty(&mddev
->all_mddevs
)) {
5216 spin_unlock(&all_mddevs_lock
);
5220 spin_unlock(&all_mddevs_lock
);
5222 rv
= entry
->show(mddev
, page
);
5228 md_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
5229 const char *page
, size_t length
)
5231 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
5232 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
5237 if (!capable(CAP_SYS_ADMIN
))
5239 spin_lock(&all_mddevs_lock
);
5240 if (list_empty(&mddev
->all_mddevs
)) {
5241 spin_unlock(&all_mddevs_lock
);
5245 spin_unlock(&all_mddevs_lock
);
5246 rv
= entry
->store(mddev
, page
, length
);
5251 static void md_free(struct kobject
*ko
)
5253 struct mddev
*mddev
= container_of(ko
, struct mddev
, kobj
);
5255 if (mddev
->sysfs_state
)
5256 sysfs_put(mddev
->sysfs_state
);
5259 blk_cleanup_queue(mddev
->queue
);
5260 if (mddev
->gendisk
) {
5261 del_gendisk(mddev
->gendisk
);
5262 put_disk(mddev
->gendisk
);
5264 percpu_ref_exit(&mddev
->writes_pending
);
5269 static const struct sysfs_ops md_sysfs_ops
= {
5270 .show
= md_attr_show
,
5271 .store
= md_attr_store
,
5273 static struct kobj_type md_ktype
= {
5275 .sysfs_ops
= &md_sysfs_ops
,
5276 .default_attrs
= md_default_attrs
,
5281 static void mddev_delayed_delete(struct work_struct
*ws
)
5283 struct mddev
*mddev
= container_of(ws
, struct mddev
, del_work
);
5285 sysfs_remove_group(&mddev
->kobj
, &md_bitmap_group
);
5286 kobject_del(&mddev
->kobj
);
5287 kobject_put(&mddev
->kobj
);
5290 static void no_op(struct percpu_ref
*r
) {}
5292 int mddev_init_writes_pending(struct mddev
*mddev
)
5294 if (mddev
->writes_pending
.percpu_count_ptr
)
5296 if (percpu_ref_init(&mddev
->writes_pending
, no_op
, 0, GFP_KERNEL
) < 0)
5298 /* We want to start with the refcount at zero */
5299 percpu_ref_put(&mddev
->writes_pending
);
5302 EXPORT_SYMBOL_GPL(mddev_init_writes_pending
);
5304 static int md_alloc(dev_t dev
, char *name
)
5307 * If dev is zero, name is the name of a device to allocate with
5308 * an arbitrary minor number. It will be "md_???"
5309 * If dev is non-zero it must be a device number with a MAJOR of
5310 * MD_MAJOR or mdp_major. In this case, if "name" is NULL, then
5311 * the device is being created by opening a node in /dev.
5312 * If "name" is not NULL, the device is being created by
5313 * writing to /sys/module/md_mod/parameters/new_array.
5315 static DEFINE_MUTEX(disks_mutex
);
5316 struct mddev
*mddev
= mddev_find(dev
);
5317 struct gendisk
*disk
;
5326 partitioned
= (MAJOR(mddev
->unit
) != MD_MAJOR
);
5327 shift
= partitioned
? MdpMinorShift
: 0;
5328 unit
= MINOR(mddev
->unit
) >> shift
;
5330 /* wait for any previous instance of this device to be
5331 * completely removed (mddev_delayed_delete).
5333 flush_workqueue(md_misc_wq
);
5335 mutex_lock(&disks_mutex
);
5341 /* Need to ensure that 'name' is not a duplicate.
5343 struct mddev
*mddev2
;
5344 spin_lock(&all_mddevs_lock
);
5346 list_for_each_entry(mddev2
, &all_mddevs
, all_mddevs
)
5347 if (mddev2
->gendisk
&&
5348 strcmp(mddev2
->gendisk
->disk_name
, name
) == 0) {
5349 spin_unlock(&all_mddevs_lock
);
5352 spin_unlock(&all_mddevs_lock
);
5356 * Creating /dev/mdNNN via "newarray", so adjust hold_active.
5358 mddev
->hold_active
= UNTIL_STOP
;
5361 mddev
->queue
= blk_alloc_queue(GFP_KERNEL
);
5364 mddev
->queue
->queuedata
= mddev
;
5366 blk_queue_make_request(mddev
->queue
, md_make_request
);
5367 blk_set_stacking_limits(&mddev
->queue
->limits
);
5369 disk
= alloc_disk(1 << shift
);
5371 blk_cleanup_queue(mddev
->queue
);
5372 mddev
->queue
= NULL
;
5375 disk
->major
= MAJOR(mddev
->unit
);
5376 disk
->first_minor
= unit
<< shift
;
5378 strcpy(disk
->disk_name
, name
);
5379 else if (partitioned
)
5380 sprintf(disk
->disk_name
, "md_d%d", unit
);
5382 sprintf(disk
->disk_name
, "md%d", unit
);
5383 disk
->fops
= &md_fops
;
5384 disk
->private_data
= mddev
;
5385 disk
->queue
= mddev
->queue
;
5386 blk_queue_write_cache(mddev
->queue
, true, true);
5387 /* Allow extended partitions. This makes the
5388 * 'mdp' device redundant, but we can't really
5391 disk
->flags
|= GENHD_FL_EXT_DEVT
;
5392 mddev
->gendisk
= disk
;
5393 /* As soon as we call add_disk(), another thread could get
5394 * through to md_open, so make sure it doesn't get too far
5396 mutex_lock(&mddev
->open_mutex
);
5399 error
= kobject_init_and_add(&mddev
->kobj
, &md_ktype
,
5400 &disk_to_dev(disk
)->kobj
, "%s", "md");
5402 /* This isn't possible, but as kobject_init_and_add is marked
5403 * __must_check, we must do something with the result
5405 pr_debug("md: cannot register %s/md - name in use\n",
5409 if (mddev
->kobj
.sd
&&
5410 sysfs_create_group(&mddev
->kobj
, &md_bitmap_group
))
5411 pr_debug("pointless warning\n");
5412 mutex_unlock(&mddev
->open_mutex
);
5414 mutex_unlock(&disks_mutex
);
5415 if (!error
&& mddev
->kobj
.sd
) {
5416 kobject_uevent(&mddev
->kobj
, KOBJ_ADD
);
5417 mddev
->sysfs_state
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "array_state");
5423 static struct kobject
*md_probe(dev_t dev
, int *part
, void *data
)
5426 md_alloc(dev
, NULL
);
5430 static int add_named_array(const char *val
, const struct kernel_param
*kp
)
5433 * val must be "md_*" or "mdNNN".
5434 * For "md_*" we allocate an array with a large free minor number, and
5435 * set the name to val. val must not already be an active name.
5436 * For "mdNNN" we allocate an array with the minor number NNN
5437 * which must not already be in use.
5439 int len
= strlen(val
);
5440 char buf
[DISK_NAME_LEN
];
5441 unsigned long devnum
;
5443 while (len
&& val
[len
-1] == '\n')
5445 if (len
>= DISK_NAME_LEN
)
5447 strlcpy(buf
, val
, len
+1);
5448 if (strncmp(buf
, "md_", 3) == 0)
5449 return md_alloc(0, buf
);
5450 if (strncmp(buf
, "md", 2) == 0 &&
5452 kstrtoul(buf
+2, 10, &devnum
) == 0 &&
5453 devnum
<= MINORMASK
)
5454 return md_alloc(MKDEV(MD_MAJOR
, devnum
), NULL
);
5459 static void md_safemode_timeout(struct timer_list
*t
)
5461 struct mddev
*mddev
= from_timer(mddev
, t
, safemode_timer
);
5463 mddev
->safemode
= 1;
5464 if (mddev
->external
)
5465 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5467 md_wakeup_thread(mddev
->thread
);
5470 static int start_dirty_degraded
;
5472 int md_run(struct mddev
*mddev
)
5475 struct md_rdev
*rdev
;
5476 struct md_personality
*pers
;
5478 if (list_empty(&mddev
->disks
))
5479 /* cannot run an array with no devices.. */
5484 /* Cannot run until previous stop completes properly */
5485 if (mddev
->sysfs_active
)
5489 * Analyze all RAID superblock(s)
5491 if (!mddev
->raid_disks
) {
5492 if (!mddev
->persistent
)
5497 if (mddev
->level
!= LEVEL_NONE
)
5498 request_module("md-level-%d", mddev
->level
);
5499 else if (mddev
->clevel
[0])
5500 request_module("md-%s", mddev
->clevel
);
5503 * Drop all container device buffers, from now on
5504 * the only valid external interface is through the md
5507 mddev
->has_superblocks
= false;
5508 rdev_for_each(rdev
, mddev
) {
5509 if (test_bit(Faulty
, &rdev
->flags
))
5511 sync_blockdev(rdev
->bdev
);
5512 invalidate_bdev(rdev
->bdev
);
5513 if (mddev
->ro
!= 1 &&
5514 (bdev_read_only(rdev
->bdev
) ||
5515 bdev_read_only(rdev
->meta_bdev
))) {
5518 set_disk_ro(mddev
->gendisk
, 1);
5522 mddev
->has_superblocks
= true;
5524 /* perform some consistency tests on the device.
5525 * We don't want the data to overlap the metadata,
5526 * Internal Bitmap issues have been handled elsewhere.
5528 if (rdev
->meta_bdev
) {
5529 /* Nothing to check */;
5530 } else if (rdev
->data_offset
< rdev
->sb_start
) {
5531 if (mddev
->dev_sectors
&&
5532 rdev
->data_offset
+ mddev
->dev_sectors
5534 pr_warn("md: %s: data overlaps metadata\n",
5539 if (rdev
->sb_start
+ rdev
->sb_size
/512
5540 > rdev
->data_offset
) {
5541 pr_warn("md: %s: metadata overlaps data\n",
5546 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
5549 if (mddev
->bio_set
== NULL
) {
5550 mddev
->bio_set
= bioset_create(BIO_POOL_SIZE
, 0, BIOSET_NEED_BVECS
);
5551 if (!mddev
->bio_set
)
5554 if (mddev
->sync_set
== NULL
) {
5555 mddev
->sync_set
= bioset_create(BIO_POOL_SIZE
, 0, BIOSET_NEED_BVECS
);
5556 if (!mddev
->sync_set
) {
5562 spin_lock(&pers_lock
);
5563 pers
= find_pers(mddev
->level
, mddev
->clevel
);
5564 if (!pers
|| !try_module_get(pers
->owner
)) {
5565 spin_unlock(&pers_lock
);
5566 if (mddev
->level
!= LEVEL_NONE
)
5567 pr_warn("md: personality for level %d is not loaded!\n",
5570 pr_warn("md: personality for level %s is not loaded!\n",
5575 spin_unlock(&pers_lock
);
5576 if (mddev
->level
!= pers
->level
) {
5577 mddev
->level
= pers
->level
;
5578 mddev
->new_level
= pers
->level
;
5580 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
5582 if (mddev
->reshape_position
!= MaxSector
&&
5583 pers
->start_reshape
== NULL
) {
5584 /* This personality cannot handle reshaping... */
5585 module_put(pers
->owner
);
5590 if (pers
->sync_request
) {
5591 /* Warn if this is a potentially silly
5594 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
5595 struct md_rdev
*rdev2
;
5598 rdev_for_each(rdev
, mddev
)
5599 rdev_for_each(rdev2
, mddev
) {
5601 rdev
->bdev
->bd_contains
==
5602 rdev2
->bdev
->bd_contains
) {
5603 pr_warn("%s: WARNING: %s appears to be on the same physical disk as %s.\n",
5605 bdevname(rdev
->bdev
,b
),
5606 bdevname(rdev2
->bdev
,b2
));
5612 pr_warn("True protection against single-disk failure might be compromised.\n");
5615 mddev
->recovery
= 0;
5616 /* may be over-ridden by personality */
5617 mddev
->resync_max_sectors
= mddev
->dev_sectors
;
5619 mddev
->ok_start_degraded
= start_dirty_degraded
;
5621 if (start_readonly
&& mddev
->ro
== 0)
5622 mddev
->ro
= 2; /* read-only, but switch on first write */
5625 * NOTE: some pers->run(), for example r5l_recovery_log(), wakes
5626 * up mddev->thread. It is important to initialize critical
5627 * resources for mddev->thread BEFORE calling pers->run().
5629 err
= pers
->run(mddev
);
5631 pr_warn("md: pers->run() failed ...\n");
5632 else if (pers
->size(mddev
, 0, 0) < mddev
->array_sectors
) {
5633 WARN_ONCE(!mddev
->external_size
,
5634 "%s: default size too small, but 'external_size' not in effect?\n",
5636 pr_warn("md: invalid array_size %llu > default size %llu\n",
5637 (unsigned long long)mddev
->array_sectors
/ 2,
5638 (unsigned long long)pers
->size(mddev
, 0, 0) / 2);
5641 if (err
== 0 && pers
->sync_request
&&
5642 (mddev
->bitmap_info
.file
|| mddev
->bitmap_info
.offset
)) {
5643 struct bitmap
*bitmap
;
5645 bitmap
= bitmap_create(mddev
, -1);
5646 if (IS_ERR(bitmap
)) {
5647 err
= PTR_ERR(bitmap
);
5648 pr_warn("%s: failed to create bitmap (%d)\n",
5649 mdname(mddev
), err
);
5651 mddev
->bitmap
= bitmap
;
5655 mddev_detach(mddev
);
5657 pers
->free(mddev
, mddev
->private);
5658 mddev
->private = NULL
;
5659 module_put(pers
->owner
);
5660 bitmap_destroy(mddev
);
5666 rdev_for_each(rdev
, mddev
) {
5667 if (rdev
->raid_disk
>= 0 &&
5668 !blk_queue_nonrot(bdev_get_queue(rdev
->bdev
))) {
5673 if (mddev
->degraded
)
5676 queue_flag_set_unlocked(QUEUE_FLAG_NONROT
, mddev
->queue
);
5678 queue_flag_clear_unlocked(QUEUE_FLAG_NONROT
, mddev
->queue
);
5679 mddev
->queue
->backing_dev_info
->congested_data
= mddev
;
5680 mddev
->queue
->backing_dev_info
->congested_fn
= md_congested
;
5682 if (pers
->sync_request
) {
5683 if (mddev
->kobj
.sd
&&
5684 sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
5685 pr_warn("md: cannot register extra attributes for %s\n",
5687 mddev
->sysfs_action
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "sync_action");
5688 } else if (mddev
->ro
== 2) /* auto-readonly not meaningful */
5691 atomic_set(&mddev
->max_corr_read_errors
,
5692 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS
);
5693 mddev
->safemode
= 0;
5694 if (mddev_is_clustered(mddev
))
5695 mddev
->safemode_delay
= 0;
5697 mddev
->safemode_delay
= (200 * HZ
)/1000 +1; /* 200 msec delay */
5700 spin_lock(&mddev
->lock
);
5702 spin_unlock(&mddev
->lock
);
5703 rdev_for_each(rdev
, mddev
)
5704 if (rdev
->raid_disk
>= 0)
5705 if (sysfs_link_rdev(mddev
, rdev
))
5706 /* failure here is OK */;
5708 if (mddev
->degraded
&& !mddev
->ro
)
5709 /* This ensures that recovering status is reported immediately
5710 * via sysfs - until a lack of spares is confirmed.
5712 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
5713 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5715 if (mddev
->sb_flags
)
5716 md_update_sb(mddev
, 0);
5718 md_new_event(mddev
);
5722 if (mddev
->bio_set
) {
5723 bioset_free(mddev
->bio_set
);
5724 mddev
->bio_set
= NULL
;
5726 if (mddev
->sync_set
) {
5727 bioset_free(mddev
->sync_set
);
5728 mddev
->sync_set
= NULL
;
5733 EXPORT_SYMBOL_GPL(md_run
);
5735 static int do_md_run(struct mddev
*mddev
)
5739 set_bit(MD_NOT_READY
, &mddev
->flags
);
5740 err
= md_run(mddev
);
5743 err
= bitmap_load(mddev
);
5745 bitmap_destroy(mddev
);
5749 if (mddev_is_clustered(mddev
))
5750 md_allow_write(mddev
);
5752 md_wakeup_thread(mddev
->thread
);
5753 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
5755 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
5756 revalidate_disk(mddev
->gendisk
);
5757 clear_bit(MD_NOT_READY
, &mddev
->flags
);
5759 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
5760 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5761 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
5762 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
5764 clear_bit(MD_NOT_READY
, &mddev
->flags
);
5768 static int restart_array(struct mddev
*mddev
)
5770 struct gendisk
*disk
= mddev
->gendisk
;
5771 struct md_rdev
*rdev
;
5772 bool has_journal
= false;
5773 bool has_readonly
= false;
5775 /* Complain if it has no devices */
5776 if (list_empty(&mddev
->disks
))
5784 rdev_for_each_rcu(rdev
, mddev
) {
5785 if (test_bit(Journal
, &rdev
->flags
) &&
5786 !test_bit(Faulty
, &rdev
->flags
))
5788 if (bdev_read_only(rdev
->bdev
))
5789 has_readonly
= true;
5792 if (test_bit(MD_HAS_JOURNAL
, &mddev
->flags
) && !has_journal
)
5793 /* Don't restart rw with journal missing/faulty */
5798 mddev
->safemode
= 0;
5800 set_disk_ro(disk
, 0);
5801 pr_debug("md: %s switched to read-write mode.\n", mdname(mddev
));
5802 /* Kick recovery or resync if necessary */
5803 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5804 md_wakeup_thread(mddev
->thread
);
5805 md_wakeup_thread(mddev
->sync_thread
);
5806 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5810 static void md_clean(struct mddev
*mddev
)
5812 mddev
->array_sectors
= 0;
5813 mddev
->external_size
= 0;
5814 mddev
->dev_sectors
= 0;
5815 mddev
->raid_disks
= 0;
5816 mddev
->recovery_cp
= 0;
5817 mddev
->resync_min
= 0;
5818 mddev
->resync_max
= MaxSector
;
5819 mddev
->reshape_position
= MaxSector
;
5820 mddev
->external
= 0;
5821 mddev
->persistent
= 0;
5822 mddev
->level
= LEVEL_NONE
;
5823 mddev
->clevel
[0] = 0;
5825 mddev
->sb_flags
= 0;
5827 mddev
->metadata_type
[0] = 0;
5828 mddev
->chunk_sectors
= 0;
5829 mddev
->ctime
= mddev
->utime
= 0;
5831 mddev
->max_disks
= 0;
5833 mddev
->can_decrease_events
= 0;
5834 mddev
->delta_disks
= 0;
5835 mddev
->reshape_backwards
= 0;
5836 mddev
->new_level
= LEVEL_NONE
;
5837 mddev
->new_layout
= 0;
5838 mddev
->new_chunk_sectors
= 0;
5839 mddev
->curr_resync
= 0;
5840 atomic64_set(&mddev
->resync_mismatches
, 0);
5841 mddev
->suspend_lo
= mddev
->suspend_hi
= 0;
5842 mddev
->sync_speed_min
= mddev
->sync_speed_max
= 0;
5843 mddev
->recovery
= 0;
5846 mddev
->degraded
= 0;
5847 mddev
->safemode
= 0;
5848 mddev
->private = NULL
;
5849 mddev
->cluster_info
= NULL
;
5850 mddev
->bitmap_info
.offset
= 0;
5851 mddev
->bitmap_info
.default_offset
= 0;
5852 mddev
->bitmap_info
.default_space
= 0;
5853 mddev
->bitmap_info
.chunksize
= 0;
5854 mddev
->bitmap_info
.daemon_sleep
= 0;
5855 mddev
->bitmap_info
.max_write_behind
= 0;
5856 mddev
->bitmap_info
.nodes
= 0;
5859 static void __md_stop_writes(struct mddev
*mddev
)
5861 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5862 flush_workqueue(md_misc_wq
);
5863 if (mddev
->sync_thread
) {
5864 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5865 md_reap_sync_thread(mddev
);
5868 del_timer_sync(&mddev
->safemode_timer
);
5870 if (mddev
->pers
&& mddev
->pers
->quiesce
) {
5871 mddev
->pers
->quiesce(mddev
, 1);
5872 mddev
->pers
->quiesce(mddev
, 0);
5874 bitmap_flush(mddev
);
5876 if (mddev
->ro
== 0 &&
5877 ((!mddev
->in_sync
&& !mddev_is_clustered(mddev
)) ||
5879 /* mark array as shutdown cleanly */
5880 if (!mddev_is_clustered(mddev
))
5882 md_update_sb(mddev
, 1);
5886 void md_stop_writes(struct mddev
*mddev
)
5888 mddev_lock_nointr(mddev
);
5889 __md_stop_writes(mddev
);
5890 mddev_unlock(mddev
);
5892 EXPORT_SYMBOL_GPL(md_stop_writes
);
5894 static void mddev_detach(struct mddev
*mddev
)
5896 bitmap_wait_behind_writes(mddev
);
5897 if (mddev
->pers
&& mddev
->pers
->quiesce
) {
5898 mddev
->pers
->quiesce(mddev
, 1);
5899 mddev
->pers
->quiesce(mddev
, 0);
5901 md_unregister_thread(&mddev
->thread
);
5903 blk_sync_queue(mddev
->queue
); /* the unplug fn references 'conf'*/
5906 static void __md_stop(struct mddev
*mddev
)
5908 struct md_personality
*pers
= mddev
->pers
;
5909 bitmap_destroy(mddev
);
5910 mddev_detach(mddev
);
5911 /* Ensure ->event_work is done */
5912 flush_workqueue(md_misc_wq
);
5913 spin_lock(&mddev
->lock
);
5915 spin_unlock(&mddev
->lock
);
5916 pers
->free(mddev
, mddev
->private);
5917 mddev
->private = NULL
;
5918 if (pers
->sync_request
&& mddev
->to_remove
== NULL
)
5919 mddev
->to_remove
= &md_redundancy_group
;
5920 module_put(pers
->owner
);
5921 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5924 void md_stop(struct mddev
*mddev
)
5926 /* stop the array and free an attached data structures.
5927 * This is called from dm-raid
5930 if (mddev
->bio_set
) {
5931 bioset_free(mddev
->bio_set
);
5932 mddev
->bio_set
= NULL
;
5934 if (mddev
->sync_set
) {
5935 bioset_free(mddev
->sync_set
);
5936 mddev
->sync_set
= NULL
;
5940 EXPORT_SYMBOL_GPL(md_stop
);
5942 static int md_set_readonly(struct mddev
*mddev
, struct block_device
*bdev
)
5947 if (!test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
)) {
5949 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5950 md_wakeup_thread(mddev
->thread
);
5952 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
5953 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5954 if (mddev
->sync_thread
)
5955 /* Thread might be blocked waiting for metadata update
5956 * which will now never happen */
5957 wake_up_process(mddev
->sync_thread
->tsk
);
5959 if (mddev
->external
&& test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
))
5961 mddev_unlock(mddev
);
5962 wait_event(resync_wait
, !test_bit(MD_RECOVERY_RUNNING
,
5964 wait_event(mddev
->sb_wait
,
5965 !test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
));
5966 mddev_lock_nointr(mddev
);
5968 mutex_lock(&mddev
->open_mutex
);
5969 if ((mddev
->pers
&& atomic_read(&mddev
->openers
) > !!bdev
) ||
5970 mddev
->sync_thread
||
5971 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
)) {
5972 pr_warn("md: %s still in use.\n",mdname(mddev
));
5974 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5975 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5976 md_wakeup_thread(mddev
->thread
);
5982 __md_stop_writes(mddev
);
5988 set_disk_ro(mddev
->gendisk
, 1);
5989 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5990 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5991 md_wakeup_thread(mddev
->thread
);
5992 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5996 mutex_unlock(&mddev
->open_mutex
);
6001 * 0 - completely stop and dis-assemble array
6002 * 2 - stop but do not disassemble array
6004 static int do_md_stop(struct mddev
*mddev
, int mode
,
6005 struct block_device
*bdev
)
6007 struct gendisk
*disk
= mddev
->gendisk
;
6008 struct md_rdev
*rdev
;
6011 if (!test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
)) {
6013 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
6014 md_wakeup_thread(mddev
->thread
);
6016 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
6017 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6018 if (mddev
->sync_thread
)
6019 /* Thread might be blocked waiting for metadata update
6020 * which will now never happen */
6021 wake_up_process(mddev
->sync_thread
->tsk
);
6023 mddev_unlock(mddev
);
6024 wait_event(resync_wait
, (mddev
->sync_thread
== NULL
&&
6025 !test_bit(MD_RECOVERY_RUNNING
,
6026 &mddev
->recovery
)));
6027 mddev_lock_nointr(mddev
);
6029 mutex_lock(&mddev
->open_mutex
);
6030 if ((mddev
->pers
&& atomic_read(&mddev
->openers
) > !!bdev
) ||
6031 mddev
->sysfs_active
||
6032 mddev
->sync_thread
||
6033 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
)) {
6034 pr_warn("md: %s still in use.\n",mdname(mddev
));
6035 mutex_unlock(&mddev
->open_mutex
);
6037 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
6038 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6039 md_wakeup_thread(mddev
->thread
);
6045 set_disk_ro(disk
, 0);
6047 __md_stop_writes(mddev
);
6049 mddev
->queue
->backing_dev_info
->congested_fn
= NULL
;
6051 /* tell userspace to handle 'inactive' */
6052 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6054 rdev_for_each(rdev
, mddev
)
6055 if (rdev
->raid_disk
>= 0)
6056 sysfs_unlink_rdev(mddev
, rdev
);
6058 set_capacity(disk
, 0);
6059 mutex_unlock(&mddev
->open_mutex
);
6061 revalidate_disk(disk
);
6066 mutex_unlock(&mddev
->open_mutex
);
6068 * Free resources if final stop
6071 pr_info("md: %s stopped.\n", mdname(mddev
));
6073 if (mddev
->bitmap_info
.file
) {
6074 struct file
*f
= mddev
->bitmap_info
.file
;
6075 spin_lock(&mddev
->lock
);
6076 mddev
->bitmap_info
.file
= NULL
;
6077 spin_unlock(&mddev
->lock
);
6080 mddev
->bitmap_info
.offset
= 0;
6082 export_array(mddev
);
6085 if (mddev
->hold_active
== UNTIL_STOP
)
6086 mddev
->hold_active
= 0;
6088 md_new_event(mddev
);
6089 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6094 static void autorun_array(struct mddev
*mddev
)
6096 struct md_rdev
*rdev
;
6099 if (list_empty(&mddev
->disks
))
6102 pr_info("md: running: ");
6104 rdev_for_each(rdev
, mddev
) {
6105 char b
[BDEVNAME_SIZE
];
6106 pr_cont("<%s>", bdevname(rdev
->bdev
,b
));
6110 err
= do_md_run(mddev
);
6112 pr_warn("md: do_md_run() returned %d\n", err
);
6113 do_md_stop(mddev
, 0, NULL
);
6118 * lets try to run arrays based on all disks that have arrived
6119 * until now. (those are in pending_raid_disks)
6121 * the method: pick the first pending disk, collect all disks with
6122 * the same UUID, remove all from the pending list and put them into
6123 * the 'same_array' list. Then order this list based on superblock
6124 * update time (freshest comes first), kick out 'old' disks and
6125 * compare superblocks. If everything's fine then run it.
6127 * If "unit" is allocated, then bump its reference count
6129 static void autorun_devices(int part
)
6131 struct md_rdev
*rdev0
, *rdev
, *tmp
;
6132 struct mddev
*mddev
;
6133 char b
[BDEVNAME_SIZE
];
6135 pr_info("md: autorun ...\n");
6136 while (!list_empty(&pending_raid_disks
)) {
6139 LIST_HEAD(candidates
);
6140 rdev0
= list_entry(pending_raid_disks
.next
,
6141 struct md_rdev
, same_set
);
6143 pr_debug("md: considering %s ...\n", bdevname(rdev0
->bdev
,b
));
6144 INIT_LIST_HEAD(&candidates
);
6145 rdev_for_each_list(rdev
, tmp
, &pending_raid_disks
)
6146 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
6147 pr_debug("md: adding %s ...\n",
6148 bdevname(rdev
->bdev
,b
));
6149 list_move(&rdev
->same_set
, &candidates
);
6152 * now we have a set of devices, with all of them having
6153 * mostly sane superblocks. It's time to allocate the
6157 dev
= MKDEV(mdp_major
,
6158 rdev0
->preferred_minor
<< MdpMinorShift
);
6159 unit
= MINOR(dev
) >> MdpMinorShift
;
6161 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
6164 if (rdev0
->preferred_minor
!= unit
) {
6165 pr_warn("md: unit number in %s is bad: %d\n",
6166 bdevname(rdev0
->bdev
, b
), rdev0
->preferred_minor
);
6170 md_probe(dev
, NULL
, NULL
);
6171 mddev
= mddev_find(dev
);
6172 if (!mddev
|| !mddev
->gendisk
) {
6177 if (mddev_lock(mddev
))
6178 pr_warn("md: %s locked, cannot run\n", mdname(mddev
));
6179 else if (mddev
->raid_disks
|| mddev
->major_version
6180 || !list_empty(&mddev
->disks
)) {
6181 pr_warn("md: %s already running, cannot run %s\n",
6182 mdname(mddev
), bdevname(rdev0
->bdev
,b
));
6183 mddev_unlock(mddev
);
6185 pr_debug("md: created %s\n", mdname(mddev
));
6186 mddev
->persistent
= 1;
6187 rdev_for_each_list(rdev
, tmp
, &candidates
) {
6188 list_del_init(&rdev
->same_set
);
6189 if (bind_rdev_to_array(rdev
, mddev
))
6192 autorun_array(mddev
);
6193 mddev_unlock(mddev
);
6195 /* on success, candidates will be empty, on error
6198 rdev_for_each_list(rdev
, tmp
, &candidates
) {
6199 list_del_init(&rdev
->same_set
);
6204 pr_info("md: ... autorun DONE.\n");
6206 #endif /* !MODULE */
6208 static int get_version(void __user
*arg
)
6212 ver
.major
= MD_MAJOR_VERSION
;
6213 ver
.minor
= MD_MINOR_VERSION
;
6214 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
6216 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
6222 static int get_array_info(struct mddev
*mddev
, void __user
*arg
)
6224 mdu_array_info_t info
;
6225 int nr
,working
,insync
,failed
,spare
;
6226 struct md_rdev
*rdev
;
6228 nr
= working
= insync
= failed
= spare
= 0;
6230 rdev_for_each_rcu(rdev
, mddev
) {
6232 if (test_bit(Faulty
, &rdev
->flags
))
6236 if (test_bit(In_sync
, &rdev
->flags
))
6238 else if (test_bit(Journal
, &rdev
->flags
))
6239 /* TODO: add journal count to md_u.h */
6247 info
.major_version
= mddev
->major_version
;
6248 info
.minor_version
= mddev
->minor_version
;
6249 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
6250 info
.ctime
= clamp_t(time64_t
, mddev
->ctime
, 0, U32_MAX
);
6251 info
.level
= mddev
->level
;
6252 info
.size
= mddev
->dev_sectors
/ 2;
6253 if (info
.size
!= mddev
->dev_sectors
/ 2) /* overflow */
6256 info
.raid_disks
= mddev
->raid_disks
;
6257 info
.md_minor
= mddev
->md_minor
;
6258 info
.not_persistent
= !mddev
->persistent
;
6260 info
.utime
= clamp_t(time64_t
, mddev
->utime
, 0, U32_MAX
);
6263 info
.state
= (1<<MD_SB_CLEAN
);
6264 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
6265 info
.state
|= (1<<MD_SB_BITMAP_PRESENT
);
6266 if (mddev_is_clustered(mddev
))
6267 info
.state
|= (1<<MD_SB_CLUSTERED
);
6268 info
.active_disks
= insync
;
6269 info
.working_disks
= working
;
6270 info
.failed_disks
= failed
;
6271 info
.spare_disks
= spare
;
6273 info
.layout
= mddev
->layout
;
6274 info
.chunk_size
= mddev
->chunk_sectors
<< 9;
6276 if (copy_to_user(arg
, &info
, sizeof(info
)))
6282 static int get_bitmap_file(struct mddev
*mddev
, void __user
* arg
)
6284 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
6288 file
= kzalloc(sizeof(*file
), GFP_NOIO
);
6293 spin_lock(&mddev
->lock
);
6294 /* bitmap enabled */
6295 if (mddev
->bitmap_info
.file
) {
6296 ptr
= file_path(mddev
->bitmap_info
.file
, file
->pathname
,
6297 sizeof(file
->pathname
));
6301 memmove(file
->pathname
, ptr
,
6302 sizeof(file
->pathname
)-(ptr
-file
->pathname
));
6304 spin_unlock(&mddev
->lock
);
6307 copy_to_user(arg
, file
, sizeof(*file
)))
6314 static int get_disk_info(struct mddev
*mddev
, void __user
* arg
)
6316 mdu_disk_info_t info
;
6317 struct md_rdev
*rdev
;
6319 if (copy_from_user(&info
, arg
, sizeof(info
)))
6323 rdev
= md_find_rdev_nr_rcu(mddev
, info
.number
);
6325 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
6326 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
6327 info
.raid_disk
= rdev
->raid_disk
;
6329 if (test_bit(Faulty
, &rdev
->flags
))
6330 info
.state
|= (1<<MD_DISK_FAULTY
);
6331 else if (test_bit(In_sync
, &rdev
->flags
)) {
6332 info
.state
|= (1<<MD_DISK_ACTIVE
);
6333 info
.state
|= (1<<MD_DISK_SYNC
);
6335 if (test_bit(Journal
, &rdev
->flags
))
6336 info
.state
|= (1<<MD_DISK_JOURNAL
);
6337 if (test_bit(WriteMostly
, &rdev
->flags
))
6338 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
6339 if (test_bit(FailFast
, &rdev
->flags
))
6340 info
.state
|= (1<<MD_DISK_FAILFAST
);
6342 info
.major
= info
.minor
= 0;
6343 info
.raid_disk
= -1;
6344 info
.state
= (1<<MD_DISK_REMOVED
);
6348 if (copy_to_user(arg
, &info
, sizeof(info
)))
6354 static int add_new_disk(struct mddev
*mddev
, mdu_disk_info_t
*info
)
6356 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
6357 struct md_rdev
*rdev
;
6358 dev_t dev
= MKDEV(info
->major
,info
->minor
);
6360 if (mddev_is_clustered(mddev
) &&
6361 !(info
->state
& ((1 << MD_DISK_CLUSTER_ADD
) | (1 << MD_DISK_CANDIDATE
)))) {
6362 pr_warn("%s: Cannot add to clustered mddev.\n",
6367 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
6370 if (!mddev
->raid_disks
) {
6372 /* expecting a device which has a superblock */
6373 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
6375 pr_warn("md: md_import_device returned %ld\n",
6377 return PTR_ERR(rdev
);
6379 if (!list_empty(&mddev
->disks
)) {
6380 struct md_rdev
*rdev0
6381 = list_entry(mddev
->disks
.next
,
6382 struct md_rdev
, same_set
);
6383 err
= super_types
[mddev
->major_version
]
6384 .load_super(rdev
, rdev0
, mddev
->minor_version
);
6386 pr_warn("md: %s has different UUID to %s\n",
6387 bdevname(rdev
->bdev
,b
),
6388 bdevname(rdev0
->bdev
,b2
));
6393 err
= bind_rdev_to_array(rdev
, mddev
);
6400 * add_new_disk can be used once the array is assembled
6401 * to add "hot spares". They must already have a superblock
6406 if (!mddev
->pers
->hot_add_disk
) {
6407 pr_warn("%s: personality does not support diskops!\n",
6411 if (mddev
->persistent
)
6412 rdev
= md_import_device(dev
, mddev
->major_version
,
6413 mddev
->minor_version
);
6415 rdev
= md_import_device(dev
, -1, -1);
6417 pr_warn("md: md_import_device returned %ld\n",
6419 return PTR_ERR(rdev
);
6421 /* set saved_raid_disk if appropriate */
6422 if (!mddev
->persistent
) {
6423 if (info
->state
& (1<<MD_DISK_SYNC
) &&
6424 info
->raid_disk
< mddev
->raid_disks
) {
6425 rdev
->raid_disk
= info
->raid_disk
;
6426 set_bit(In_sync
, &rdev
->flags
);
6427 clear_bit(Bitmap_sync
, &rdev
->flags
);
6429 rdev
->raid_disk
= -1;
6430 rdev
->saved_raid_disk
= rdev
->raid_disk
;
6432 super_types
[mddev
->major_version
].
6433 validate_super(mddev
, rdev
);
6434 if ((info
->state
& (1<<MD_DISK_SYNC
)) &&
6435 rdev
->raid_disk
!= info
->raid_disk
) {
6436 /* This was a hot-add request, but events doesn't
6437 * match, so reject it.
6443 clear_bit(In_sync
, &rdev
->flags
); /* just to be sure */
6444 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
6445 set_bit(WriteMostly
, &rdev
->flags
);
6447 clear_bit(WriteMostly
, &rdev
->flags
);
6448 if (info
->state
& (1<<MD_DISK_FAILFAST
))
6449 set_bit(FailFast
, &rdev
->flags
);
6451 clear_bit(FailFast
, &rdev
->flags
);
6453 if (info
->state
& (1<<MD_DISK_JOURNAL
)) {
6454 struct md_rdev
*rdev2
;
6455 bool has_journal
= false;
6457 /* make sure no existing journal disk */
6458 rdev_for_each(rdev2
, mddev
) {
6459 if (test_bit(Journal
, &rdev2
->flags
)) {
6464 if (has_journal
|| mddev
->bitmap
) {
6468 set_bit(Journal
, &rdev
->flags
);
6471 * check whether the device shows up in other nodes
6473 if (mddev_is_clustered(mddev
)) {
6474 if (info
->state
& (1 << MD_DISK_CANDIDATE
))
6475 set_bit(Candidate
, &rdev
->flags
);
6476 else if (info
->state
& (1 << MD_DISK_CLUSTER_ADD
)) {
6477 /* --add initiated by this node */
6478 err
= md_cluster_ops
->add_new_disk(mddev
, rdev
);
6486 rdev
->raid_disk
= -1;
6487 err
= bind_rdev_to_array(rdev
, mddev
);
6492 if (mddev_is_clustered(mddev
)) {
6493 if (info
->state
& (1 << MD_DISK_CANDIDATE
)) {
6495 err
= md_cluster_ops
->new_disk_ack(mddev
,
6498 md_kick_rdev_from_array(rdev
);
6502 md_cluster_ops
->add_new_disk_cancel(mddev
);
6504 err
= add_bound_rdev(rdev
);
6508 err
= add_bound_rdev(rdev
);
6513 /* otherwise, add_new_disk is only allowed
6514 * for major_version==0 superblocks
6516 if (mddev
->major_version
!= 0) {
6517 pr_warn("%s: ADD_NEW_DISK not supported\n", mdname(mddev
));
6521 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
6523 rdev
= md_import_device(dev
, -1, 0);
6525 pr_warn("md: error, md_import_device() returned %ld\n",
6527 return PTR_ERR(rdev
);
6529 rdev
->desc_nr
= info
->number
;
6530 if (info
->raid_disk
< mddev
->raid_disks
)
6531 rdev
->raid_disk
= info
->raid_disk
;
6533 rdev
->raid_disk
= -1;
6535 if (rdev
->raid_disk
< mddev
->raid_disks
)
6536 if (info
->state
& (1<<MD_DISK_SYNC
))
6537 set_bit(In_sync
, &rdev
->flags
);
6539 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
6540 set_bit(WriteMostly
, &rdev
->flags
);
6541 if (info
->state
& (1<<MD_DISK_FAILFAST
))
6542 set_bit(FailFast
, &rdev
->flags
);
6544 if (!mddev
->persistent
) {
6545 pr_debug("md: nonpersistent superblock ...\n");
6546 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
6548 rdev
->sb_start
= calc_dev_sboffset(rdev
);
6549 rdev
->sectors
= rdev
->sb_start
;
6551 err
= bind_rdev_to_array(rdev
, mddev
);
6561 static int hot_remove_disk(struct mddev
*mddev
, dev_t dev
)
6563 char b
[BDEVNAME_SIZE
];
6564 struct md_rdev
*rdev
;
6569 rdev
= find_rdev(mddev
, dev
);
6573 if (rdev
->raid_disk
< 0)
6576 clear_bit(Blocked
, &rdev
->flags
);
6577 remove_and_add_spares(mddev
, rdev
);
6579 if (rdev
->raid_disk
>= 0)
6583 if (mddev_is_clustered(mddev
))
6584 md_cluster_ops
->remove_disk(mddev
, rdev
);
6586 md_kick_rdev_from_array(rdev
);
6587 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
6589 md_wakeup_thread(mddev
->thread
);
6591 md_update_sb(mddev
, 1);
6592 md_new_event(mddev
);
6596 pr_debug("md: cannot remove active disk %s from %s ...\n",
6597 bdevname(rdev
->bdev
,b
), mdname(mddev
));
6601 static int hot_add_disk(struct mddev
*mddev
, dev_t dev
)
6603 char b
[BDEVNAME_SIZE
];
6605 struct md_rdev
*rdev
;
6610 if (mddev
->major_version
!= 0) {
6611 pr_warn("%s: HOT_ADD may only be used with version-0 superblocks.\n",
6615 if (!mddev
->pers
->hot_add_disk
) {
6616 pr_warn("%s: personality does not support diskops!\n",
6621 rdev
= md_import_device(dev
, -1, 0);
6623 pr_warn("md: error, md_import_device() returned %ld\n",
6628 if (mddev
->persistent
)
6629 rdev
->sb_start
= calc_dev_sboffset(rdev
);
6631 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
6633 rdev
->sectors
= rdev
->sb_start
;
6635 if (test_bit(Faulty
, &rdev
->flags
)) {
6636 pr_warn("md: can not hot-add faulty %s disk to %s!\n",
6637 bdevname(rdev
->bdev
,b
), mdname(mddev
));
6642 clear_bit(In_sync
, &rdev
->flags
);
6644 rdev
->saved_raid_disk
= -1;
6645 err
= bind_rdev_to_array(rdev
, mddev
);
6650 * The rest should better be atomic, we can have disk failures
6651 * noticed in interrupt contexts ...
6654 rdev
->raid_disk
= -1;
6656 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
6658 md_update_sb(mddev
, 1);
6660 * Kick recovery, maybe this spare has to be added to the
6661 * array immediately.
6663 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6664 md_wakeup_thread(mddev
->thread
);
6665 md_new_event(mddev
);
6673 static int set_bitmap_file(struct mddev
*mddev
, int fd
)
6678 if (!mddev
->pers
->quiesce
|| !mddev
->thread
)
6680 if (mddev
->recovery
|| mddev
->sync_thread
)
6682 /* we should be able to change the bitmap.. */
6686 struct inode
*inode
;
6689 if (mddev
->bitmap
|| mddev
->bitmap_info
.file
)
6690 return -EEXIST
; /* cannot add when bitmap is present */
6694 pr_warn("%s: error: failed to get bitmap file\n",
6699 inode
= f
->f_mapping
->host
;
6700 if (!S_ISREG(inode
->i_mode
)) {
6701 pr_warn("%s: error: bitmap file must be a regular file\n",
6704 } else if (!(f
->f_mode
& FMODE_WRITE
)) {
6705 pr_warn("%s: error: bitmap file must open for write\n",
6708 } else if (atomic_read(&inode
->i_writecount
) != 1) {
6709 pr_warn("%s: error: bitmap file is already in use\n",
6717 mddev
->bitmap_info
.file
= f
;
6718 mddev
->bitmap_info
.offset
= 0; /* file overrides offset */
6719 } else if (mddev
->bitmap
== NULL
)
6720 return -ENOENT
; /* cannot remove what isn't there */
6724 struct bitmap
*bitmap
;
6726 bitmap
= bitmap_create(mddev
, -1);
6727 mddev_suspend(mddev
);
6728 if (!IS_ERR(bitmap
)) {
6729 mddev
->bitmap
= bitmap
;
6730 err
= bitmap_load(mddev
);
6732 err
= PTR_ERR(bitmap
);
6734 bitmap_destroy(mddev
);
6737 mddev_resume(mddev
);
6738 } else if (fd
< 0) {
6739 mddev_suspend(mddev
);
6740 bitmap_destroy(mddev
);
6741 mddev_resume(mddev
);
6745 struct file
*f
= mddev
->bitmap_info
.file
;
6747 spin_lock(&mddev
->lock
);
6748 mddev
->bitmap_info
.file
= NULL
;
6749 spin_unlock(&mddev
->lock
);
6758 * set_array_info is used two different ways
6759 * The original usage is when creating a new array.
6760 * In this usage, raid_disks is > 0 and it together with
6761 * level, size, not_persistent,layout,chunksize determine the
6762 * shape of the array.
6763 * This will always create an array with a type-0.90.0 superblock.
6764 * The newer usage is when assembling an array.
6765 * In this case raid_disks will be 0, and the major_version field is
6766 * use to determine which style super-blocks are to be found on the devices.
6767 * The minor and patch _version numbers are also kept incase the
6768 * super_block handler wishes to interpret them.
6770 static int set_array_info(struct mddev
*mddev
, mdu_array_info_t
*info
)
6773 if (info
->raid_disks
== 0) {
6774 /* just setting version number for superblock loading */
6775 if (info
->major_version
< 0 ||
6776 info
->major_version
>= ARRAY_SIZE(super_types
) ||
6777 super_types
[info
->major_version
].name
== NULL
) {
6778 /* maybe try to auto-load a module? */
6779 pr_warn("md: superblock version %d not known\n",
6780 info
->major_version
);
6783 mddev
->major_version
= info
->major_version
;
6784 mddev
->minor_version
= info
->minor_version
;
6785 mddev
->patch_version
= info
->patch_version
;
6786 mddev
->persistent
= !info
->not_persistent
;
6787 /* ensure mddev_put doesn't delete this now that there
6788 * is some minimal configuration.
6790 mddev
->ctime
= ktime_get_real_seconds();
6793 mddev
->major_version
= MD_MAJOR_VERSION
;
6794 mddev
->minor_version
= MD_MINOR_VERSION
;
6795 mddev
->patch_version
= MD_PATCHLEVEL_VERSION
;
6796 mddev
->ctime
= ktime_get_real_seconds();
6798 mddev
->level
= info
->level
;
6799 mddev
->clevel
[0] = 0;
6800 mddev
->dev_sectors
= 2 * (sector_t
)info
->size
;
6801 mddev
->raid_disks
= info
->raid_disks
;
6802 /* don't set md_minor, it is determined by which /dev/md* was
6805 if (info
->state
& (1<<MD_SB_CLEAN
))
6806 mddev
->recovery_cp
= MaxSector
;
6808 mddev
->recovery_cp
= 0;
6809 mddev
->persistent
= ! info
->not_persistent
;
6810 mddev
->external
= 0;
6812 mddev
->layout
= info
->layout
;
6813 mddev
->chunk_sectors
= info
->chunk_size
>> 9;
6815 if (mddev
->persistent
) {
6816 mddev
->max_disks
= MD_SB_DISKS
;
6818 mddev
->sb_flags
= 0;
6820 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
6822 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
6823 mddev
->bitmap_info
.default_space
= 64*2 - (MD_SB_BYTES
>> 9);
6824 mddev
->bitmap_info
.offset
= 0;
6826 mddev
->reshape_position
= MaxSector
;
6829 * Generate a 128 bit UUID
6831 get_random_bytes(mddev
->uuid
, 16);
6833 mddev
->new_level
= mddev
->level
;
6834 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
6835 mddev
->new_layout
= mddev
->layout
;
6836 mddev
->delta_disks
= 0;
6837 mddev
->reshape_backwards
= 0;
6842 void md_set_array_sectors(struct mddev
*mddev
, sector_t array_sectors
)
6844 lockdep_assert_held(&mddev
->reconfig_mutex
);
6846 if (mddev
->external_size
)
6849 mddev
->array_sectors
= array_sectors
;
6851 EXPORT_SYMBOL(md_set_array_sectors
);
6853 static int update_size(struct mddev
*mddev
, sector_t num_sectors
)
6855 struct md_rdev
*rdev
;
6857 int fit
= (num_sectors
== 0);
6858 sector_t old_dev_sectors
= mddev
->dev_sectors
;
6860 if (mddev
->pers
->resize
== NULL
)
6862 /* The "num_sectors" is the number of sectors of each device that
6863 * is used. This can only make sense for arrays with redundancy.
6864 * linear and raid0 always use whatever space is available. We can only
6865 * consider changing this number if no resync or reconstruction is
6866 * happening, and if the new size is acceptable. It must fit before the
6867 * sb_start or, if that is <data_offset, it must fit before the size
6868 * of each device. If num_sectors is zero, we find the largest size
6871 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
6877 rdev_for_each(rdev
, mddev
) {
6878 sector_t avail
= rdev
->sectors
;
6880 if (fit
&& (num_sectors
== 0 || num_sectors
> avail
))
6881 num_sectors
= avail
;
6882 if (avail
< num_sectors
)
6885 rv
= mddev
->pers
->resize(mddev
, num_sectors
);
6887 if (mddev_is_clustered(mddev
))
6888 md_cluster_ops
->update_size(mddev
, old_dev_sectors
);
6889 else if (mddev
->queue
) {
6890 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
6891 revalidate_disk(mddev
->gendisk
);
6897 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
)
6900 struct md_rdev
*rdev
;
6901 /* change the number of raid disks */
6902 if (mddev
->pers
->check_reshape
== NULL
)
6906 if (raid_disks
<= 0 ||
6907 (mddev
->max_disks
&& raid_disks
>= mddev
->max_disks
))
6909 if (mddev
->sync_thread
||
6910 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
6911 mddev
->reshape_position
!= MaxSector
)
6914 rdev_for_each(rdev
, mddev
) {
6915 if (mddev
->raid_disks
< raid_disks
&&
6916 rdev
->data_offset
< rdev
->new_data_offset
)
6918 if (mddev
->raid_disks
> raid_disks
&&
6919 rdev
->data_offset
> rdev
->new_data_offset
)
6923 mddev
->delta_disks
= raid_disks
- mddev
->raid_disks
;
6924 if (mddev
->delta_disks
< 0)
6925 mddev
->reshape_backwards
= 1;
6926 else if (mddev
->delta_disks
> 0)
6927 mddev
->reshape_backwards
= 0;
6929 rv
= mddev
->pers
->check_reshape(mddev
);
6931 mddev
->delta_disks
= 0;
6932 mddev
->reshape_backwards
= 0;
6938 * update_array_info is used to change the configuration of an
6940 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
6941 * fields in the info are checked against the array.
6942 * Any differences that cannot be handled will cause an error.
6943 * Normally, only one change can be managed at a time.
6945 static int update_array_info(struct mddev
*mddev
, mdu_array_info_t
*info
)
6951 /* calculate expected state,ignoring low bits */
6952 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
6953 state
|= (1 << MD_SB_BITMAP_PRESENT
);
6955 if (mddev
->major_version
!= info
->major_version
||
6956 mddev
->minor_version
!= info
->minor_version
||
6957 /* mddev->patch_version != info->patch_version || */
6958 mddev
->ctime
!= info
->ctime
||
6959 mddev
->level
!= info
->level
||
6960 /* mddev->layout != info->layout || */
6961 mddev
->persistent
!= !info
->not_persistent
||
6962 mddev
->chunk_sectors
!= info
->chunk_size
>> 9 ||
6963 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
6964 ((state
^info
->state
) & 0xfffffe00)
6967 /* Check there is only one change */
6968 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
6970 if (mddev
->raid_disks
!= info
->raid_disks
)
6972 if (mddev
->layout
!= info
->layout
)
6974 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
))
6981 if (mddev
->layout
!= info
->layout
) {
6983 * we don't need to do anything at the md level, the
6984 * personality will take care of it all.
6986 if (mddev
->pers
->check_reshape
== NULL
)
6989 mddev
->new_layout
= info
->layout
;
6990 rv
= mddev
->pers
->check_reshape(mddev
);
6992 mddev
->new_layout
= mddev
->layout
;
6996 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
6997 rv
= update_size(mddev
, (sector_t
)info
->size
* 2);
6999 if (mddev
->raid_disks
!= info
->raid_disks
)
7000 rv
= update_raid_disks(mddev
, info
->raid_disks
);
7002 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) {
7003 if (mddev
->pers
->quiesce
== NULL
|| mddev
->thread
== NULL
) {
7007 if (mddev
->recovery
|| mddev
->sync_thread
) {
7011 if (info
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
7012 struct bitmap
*bitmap
;
7013 /* add the bitmap */
7014 if (mddev
->bitmap
) {
7018 if (mddev
->bitmap_info
.default_offset
== 0) {
7022 mddev
->bitmap_info
.offset
=
7023 mddev
->bitmap_info
.default_offset
;
7024 mddev
->bitmap_info
.space
=
7025 mddev
->bitmap_info
.default_space
;
7026 bitmap
= bitmap_create(mddev
, -1);
7027 mddev_suspend(mddev
);
7028 if (!IS_ERR(bitmap
)) {
7029 mddev
->bitmap
= bitmap
;
7030 rv
= bitmap_load(mddev
);
7032 rv
= PTR_ERR(bitmap
);
7034 bitmap_destroy(mddev
);
7035 mddev_resume(mddev
);
7037 /* remove the bitmap */
7038 if (!mddev
->bitmap
) {
7042 if (mddev
->bitmap
->storage
.file
) {
7046 if (mddev
->bitmap_info
.nodes
) {
7047 /* hold PW on all the bitmap lock */
7048 if (md_cluster_ops
->lock_all_bitmaps(mddev
) <= 0) {
7049 pr_warn("md: can't change bitmap to none since the array is in use by more than one node\n");
7051 md_cluster_ops
->unlock_all_bitmaps(mddev
);
7055 mddev
->bitmap_info
.nodes
= 0;
7056 md_cluster_ops
->leave(mddev
);
7058 mddev_suspend(mddev
);
7059 bitmap_destroy(mddev
);
7060 mddev_resume(mddev
);
7061 mddev
->bitmap_info
.offset
= 0;
7064 md_update_sb(mddev
, 1);
7070 static int set_disk_faulty(struct mddev
*mddev
, dev_t dev
)
7072 struct md_rdev
*rdev
;
7075 if (mddev
->pers
== NULL
)
7079 rdev
= find_rdev_rcu(mddev
, dev
);
7083 md_error(mddev
, rdev
);
7084 if (!test_bit(Faulty
, &rdev
->flags
))
7092 * We have a problem here : there is no easy way to give a CHS
7093 * virtual geometry. We currently pretend that we have a 2 heads
7094 * 4 sectors (with a BIG number of cylinders...). This drives
7095 * dosfs just mad... ;-)
7097 static int md_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
7099 struct mddev
*mddev
= bdev
->bd_disk
->private_data
;
7103 geo
->cylinders
= mddev
->array_sectors
/ 8;
7107 static inline bool md_ioctl_valid(unsigned int cmd
)
7112 case GET_ARRAY_INFO
:
7113 case GET_BITMAP_FILE
:
7116 case HOT_REMOVE_DISK
:
7119 case RESTART_ARRAY_RW
:
7121 case SET_ARRAY_INFO
:
7122 case SET_BITMAP_FILE
:
7123 case SET_DISK_FAULTY
:
7126 case CLUSTERED_DISK_NACK
:
7133 static int md_ioctl(struct block_device
*bdev
, fmode_t mode
,
7134 unsigned int cmd
, unsigned long arg
)
7137 void __user
*argp
= (void __user
*)arg
;
7138 struct mddev
*mddev
= NULL
;
7140 bool did_set_md_closing
= false;
7142 if (!md_ioctl_valid(cmd
))
7147 case GET_ARRAY_INFO
:
7151 if (!capable(CAP_SYS_ADMIN
))
7156 * Commands dealing with the RAID driver but not any
7161 err
= get_version(argp
);
7167 autostart_arrays(arg
);
7174 * Commands creating/starting a new array:
7177 mddev
= bdev
->bd_disk
->private_data
;
7184 /* Some actions do not requires the mutex */
7186 case GET_ARRAY_INFO
:
7187 if (!mddev
->raid_disks
&& !mddev
->external
)
7190 err
= get_array_info(mddev
, argp
);
7194 if (!mddev
->raid_disks
&& !mddev
->external
)
7197 err
= get_disk_info(mddev
, argp
);
7200 case SET_DISK_FAULTY
:
7201 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
7204 case GET_BITMAP_FILE
:
7205 err
= get_bitmap_file(mddev
, argp
);
7210 if (cmd
== ADD_NEW_DISK
)
7211 /* need to ensure md_delayed_delete() has completed */
7212 flush_workqueue(md_misc_wq
);
7214 if (cmd
== HOT_REMOVE_DISK
)
7215 /* need to ensure recovery thread has run */
7216 wait_event_interruptible_timeout(mddev
->sb_wait
,
7217 !test_bit(MD_RECOVERY_NEEDED
,
7219 msecs_to_jiffies(5000));
7220 if (cmd
== STOP_ARRAY
|| cmd
== STOP_ARRAY_RO
) {
7221 /* Need to flush page cache, and ensure no-one else opens
7224 mutex_lock(&mddev
->open_mutex
);
7225 if (mddev
->pers
&& atomic_read(&mddev
->openers
) > 1) {
7226 mutex_unlock(&mddev
->open_mutex
);
7230 WARN_ON_ONCE(test_bit(MD_CLOSING
, &mddev
->flags
));
7231 set_bit(MD_CLOSING
, &mddev
->flags
);
7232 did_set_md_closing
= true;
7233 mutex_unlock(&mddev
->open_mutex
);
7234 sync_blockdev(bdev
);
7236 err
= mddev_lock(mddev
);
7238 pr_debug("md: ioctl lock interrupted, reason %d, cmd %d\n",
7243 if (cmd
== SET_ARRAY_INFO
) {
7244 mdu_array_info_t info
;
7246 memset(&info
, 0, sizeof(info
));
7247 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
7252 err
= update_array_info(mddev
, &info
);
7254 pr_warn("md: couldn't update array info. %d\n", err
);
7259 if (!list_empty(&mddev
->disks
)) {
7260 pr_warn("md: array %s already has disks!\n", mdname(mddev
));
7264 if (mddev
->raid_disks
) {
7265 pr_warn("md: array %s already initialised!\n", mdname(mddev
));
7269 err
= set_array_info(mddev
, &info
);
7271 pr_warn("md: couldn't set array info. %d\n", err
);
7278 * Commands querying/configuring an existing array:
7280 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
7281 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
7282 if ((!mddev
->raid_disks
&& !mddev
->external
)
7283 && cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
7284 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
7285 && cmd
!= GET_BITMAP_FILE
) {
7291 * Commands even a read-only array can execute:
7294 case RESTART_ARRAY_RW
:
7295 err
= restart_array(mddev
);
7299 err
= do_md_stop(mddev
, 0, bdev
);
7303 err
= md_set_readonly(mddev
, bdev
);
7306 case HOT_REMOVE_DISK
:
7307 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
7311 /* We can support ADD_NEW_DISK on read-only arrays
7312 * only if we are re-adding a preexisting device.
7313 * So require mddev->pers and MD_DISK_SYNC.
7316 mdu_disk_info_t info
;
7317 if (copy_from_user(&info
, argp
, sizeof(info
)))
7319 else if (!(info
.state
& (1<<MD_DISK_SYNC
)))
7320 /* Need to clear read-only for this */
7323 err
= add_new_disk(mddev
, &info
);
7329 if (get_user(ro
, (int __user
*)(arg
))) {
7335 /* if the bdev is going readonly the value of mddev->ro
7336 * does not matter, no writes are coming
7341 /* are we are already prepared for writes? */
7345 /* transitioning to readauto need only happen for
7346 * arrays that call md_write_start
7349 err
= restart_array(mddev
);
7352 set_disk_ro(mddev
->gendisk
, 0);
7359 * The remaining ioctls are changing the state of the
7360 * superblock, so we do not allow them on read-only arrays.
7362 if (mddev
->ro
&& mddev
->pers
) {
7363 if (mddev
->ro
== 2) {
7365 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7366 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7367 /* mddev_unlock will wake thread */
7368 /* If a device failed while we were read-only, we
7369 * need to make sure the metadata is updated now.
7371 if (test_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
)) {
7372 mddev_unlock(mddev
);
7373 wait_event(mddev
->sb_wait
,
7374 !test_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
) &&
7375 !test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
));
7376 mddev_lock_nointr(mddev
);
7387 mdu_disk_info_t info
;
7388 if (copy_from_user(&info
, argp
, sizeof(info
)))
7391 err
= add_new_disk(mddev
, &info
);
7395 case CLUSTERED_DISK_NACK
:
7396 if (mddev_is_clustered(mddev
))
7397 md_cluster_ops
->new_disk_ack(mddev
, false);
7403 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
7407 err
= do_md_run(mddev
);
7410 case SET_BITMAP_FILE
:
7411 err
= set_bitmap_file(mddev
, (int)arg
);
7420 if (mddev
->hold_active
== UNTIL_IOCTL
&&
7422 mddev
->hold_active
= 0;
7423 mddev_unlock(mddev
);
7425 if(did_set_md_closing
)
7426 clear_bit(MD_CLOSING
, &mddev
->flags
);
7429 #ifdef CONFIG_COMPAT
7430 static int md_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
7431 unsigned int cmd
, unsigned long arg
)
7434 case HOT_REMOVE_DISK
:
7436 case SET_DISK_FAULTY
:
7437 case SET_BITMAP_FILE
:
7438 /* These take in integer arg, do not convert */
7441 arg
= (unsigned long)compat_ptr(arg
);
7445 return md_ioctl(bdev
, mode
, cmd
, arg
);
7447 #endif /* CONFIG_COMPAT */
7449 static int md_open(struct block_device
*bdev
, fmode_t mode
)
7452 * Succeed if we can lock the mddev, which confirms that
7453 * it isn't being stopped right now.
7455 struct mddev
*mddev
= mddev_find(bdev
->bd_dev
);
7461 if (mddev
->gendisk
!= bdev
->bd_disk
) {
7462 /* we are racing with mddev_put which is discarding this
7466 /* Wait until bdev->bd_disk is definitely gone */
7467 flush_workqueue(md_misc_wq
);
7468 /* Then retry the open from the top */
7469 return -ERESTARTSYS
;
7471 BUG_ON(mddev
!= bdev
->bd_disk
->private_data
);
7473 if ((err
= mutex_lock_interruptible(&mddev
->open_mutex
)))
7476 if (test_bit(MD_CLOSING
, &mddev
->flags
)) {
7477 mutex_unlock(&mddev
->open_mutex
);
7483 atomic_inc(&mddev
->openers
);
7484 mutex_unlock(&mddev
->open_mutex
);
7486 check_disk_change(bdev
);
7493 static void md_release(struct gendisk
*disk
, fmode_t mode
)
7495 struct mddev
*mddev
= disk
->private_data
;
7498 atomic_dec(&mddev
->openers
);
7502 static int md_media_changed(struct gendisk
*disk
)
7504 struct mddev
*mddev
= disk
->private_data
;
7506 return mddev
->changed
;
7509 static int md_revalidate(struct gendisk
*disk
)
7511 struct mddev
*mddev
= disk
->private_data
;
7516 static const struct block_device_operations md_fops
=
7518 .owner
= THIS_MODULE
,
7520 .release
= md_release
,
7522 #ifdef CONFIG_COMPAT
7523 .compat_ioctl
= md_compat_ioctl
,
7525 .getgeo
= md_getgeo
,
7526 .media_changed
= md_media_changed
,
7527 .revalidate_disk
= md_revalidate
,
7530 static int md_thread(void *arg
)
7532 struct md_thread
*thread
= arg
;
7535 * md_thread is a 'system-thread', it's priority should be very
7536 * high. We avoid resource deadlocks individually in each
7537 * raid personality. (RAID5 does preallocation) We also use RR and
7538 * the very same RT priority as kswapd, thus we will never get
7539 * into a priority inversion deadlock.
7541 * we definitely have to have equal or higher priority than
7542 * bdflush, otherwise bdflush will deadlock if there are too
7543 * many dirty RAID5 blocks.
7546 allow_signal(SIGKILL
);
7547 while (!kthread_should_stop()) {
7549 /* We need to wait INTERRUPTIBLE so that
7550 * we don't add to the load-average.
7551 * That means we need to be sure no signals are
7554 if (signal_pending(current
))
7555 flush_signals(current
);
7557 wait_event_interruptible_timeout
7559 test_bit(THREAD_WAKEUP
, &thread
->flags
)
7560 || kthread_should_stop() || kthread_should_park(),
7563 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
7564 if (kthread_should_park())
7566 if (!kthread_should_stop())
7567 thread
->run(thread
);
7573 void md_wakeup_thread(struct md_thread
*thread
)
7576 pr_debug("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
7577 set_bit(THREAD_WAKEUP
, &thread
->flags
);
7578 wake_up(&thread
->wqueue
);
7581 EXPORT_SYMBOL(md_wakeup_thread
);
7583 struct md_thread
*md_register_thread(void (*run
) (struct md_thread
*),
7584 struct mddev
*mddev
, const char *name
)
7586 struct md_thread
*thread
;
7588 thread
= kzalloc(sizeof(struct md_thread
), GFP_KERNEL
);
7592 init_waitqueue_head(&thread
->wqueue
);
7595 thread
->mddev
= mddev
;
7596 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
7597 thread
->tsk
= kthread_run(md_thread
, thread
,
7599 mdname(thread
->mddev
),
7601 if (IS_ERR(thread
->tsk
)) {
7607 EXPORT_SYMBOL(md_register_thread
);
7609 void md_unregister_thread(struct md_thread
**threadp
)
7611 struct md_thread
*thread
= *threadp
;
7614 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread
->tsk
));
7615 /* Locking ensures that mddev_unlock does not wake_up a
7616 * non-existent thread
7618 spin_lock(&pers_lock
);
7620 spin_unlock(&pers_lock
);
7622 kthread_stop(thread
->tsk
);
7625 EXPORT_SYMBOL(md_unregister_thread
);
7627 void md_error(struct mddev
*mddev
, struct md_rdev
*rdev
)
7629 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
7632 if (!mddev
->pers
|| !mddev
->pers
->error_handler
)
7634 mddev
->pers
->error_handler(mddev
,rdev
);
7635 if (mddev
->degraded
)
7636 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7637 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
7638 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7639 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7640 md_wakeup_thread(mddev
->thread
);
7641 if (mddev
->event_work
.func
)
7642 queue_work(md_misc_wq
, &mddev
->event_work
);
7643 md_new_event(mddev
);
7645 EXPORT_SYMBOL(md_error
);
7647 /* seq_file implementation /proc/mdstat */
7649 static void status_unused(struct seq_file
*seq
)
7652 struct md_rdev
*rdev
;
7654 seq_printf(seq
, "unused devices: ");
7656 list_for_each_entry(rdev
, &pending_raid_disks
, same_set
) {
7657 char b
[BDEVNAME_SIZE
];
7659 seq_printf(seq
, "%s ",
7660 bdevname(rdev
->bdev
,b
));
7663 seq_printf(seq
, "<none>");
7665 seq_printf(seq
, "\n");
7668 static int status_resync(struct seq_file
*seq
, struct mddev
*mddev
)
7670 sector_t max_sectors
, resync
, res
;
7671 unsigned long dt
, db
= 0;
7672 sector_t rt
, curr_mark_cnt
, resync_mark_cnt
;
7673 int scale
, recovery_active
;
7674 unsigned int per_milli
;
7676 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
7677 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
7678 max_sectors
= mddev
->resync_max_sectors
;
7680 max_sectors
= mddev
->dev_sectors
;
7682 resync
= mddev
->curr_resync
;
7684 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
7685 /* Still cleaning up */
7686 resync
= max_sectors
;
7687 } else if (resync
> max_sectors
)
7688 resync
= max_sectors
;
7690 resync
-= atomic_read(&mddev
->recovery_active
);
7693 if (mddev
->recovery_cp
< MaxSector
) {
7694 seq_printf(seq
, "\tresync=PENDING");
7700 seq_printf(seq
, "\tresync=DELAYED");
7704 WARN_ON(max_sectors
== 0);
7705 /* Pick 'scale' such that (resync>>scale)*1000 will fit
7706 * in a sector_t, and (max_sectors>>scale) will fit in a
7707 * u32, as those are the requirements for sector_div.
7708 * Thus 'scale' must be at least 10
7711 if (sizeof(sector_t
) > sizeof(unsigned long)) {
7712 while ( max_sectors
/2 > (1ULL<<(scale
+32)))
7715 res
= (resync
>>scale
)*1000;
7716 sector_div(res
, (u32
)((max_sectors
>>scale
)+1));
7720 int i
, x
= per_milli
/50, y
= 20-x
;
7721 seq_printf(seq
, "[");
7722 for (i
= 0; i
< x
; i
++)
7723 seq_printf(seq
, "=");
7724 seq_printf(seq
, ">");
7725 for (i
= 0; i
< y
; i
++)
7726 seq_printf(seq
, ".");
7727 seq_printf(seq
, "] ");
7729 seq_printf(seq
, " %s =%3u.%u%% (%llu/%llu)",
7730 (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)?
7732 (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)?
7734 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
7735 "resync" : "recovery"))),
7736 per_milli
/10, per_milli
% 10,
7737 (unsigned long long) resync
/2,
7738 (unsigned long long) max_sectors
/2);
7741 * dt: time from mark until now
7742 * db: blocks written from mark until now
7743 * rt: remaining time
7745 * rt is a sector_t, which is always 64bit now. We are keeping
7746 * the original algorithm, but it is not really necessary.
7748 * Original algorithm:
7749 * So we divide before multiply in case it is 32bit and close
7751 * We scale the divisor (db) by 32 to avoid losing precision
7752 * near the end of resync when the number of remaining sectors
7754 * We then divide rt by 32 after multiplying by db to compensate.
7755 * The '+1' avoids division by zero if db is very small.
7757 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
7760 curr_mark_cnt
= mddev
->curr_mark_cnt
;
7761 recovery_active
= atomic_read(&mddev
->recovery_active
);
7762 resync_mark_cnt
= mddev
->resync_mark_cnt
;
7764 if (curr_mark_cnt
>= (recovery_active
+ resync_mark_cnt
))
7765 db
= curr_mark_cnt
- (recovery_active
+ resync_mark_cnt
);
7767 rt
= max_sectors
- resync
; /* number of remaining sectors */
7768 rt
= div64_u64(rt
, db
/32+1);
7772 seq_printf(seq
, " finish=%lu.%lumin", (unsigned long)rt
/ 60,
7773 ((unsigned long)rt
% 60)/6);
7775 seq_printf(seq
, " speed=%ldK/sec", db
/2/dt
);
7779 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
7781 struct list_head
*tmp
;
7783 struct mddev
*mddev
;
7791 spin_lock(&all_mddevs_lock
);
7792 list_for_each(tmp
,&all_mddevs
)
7794 mddev
= list_entry(tmp
, struct mddev
, all_mddevs
);
7796 spin_unlock(&all_mddevs_lock
);
7799 spin_unlock(&all_mddevs_lock
);
7801 return (void*)2;/* tail */
7805 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
7807 struct list_head
*tmp
;
7808 struct mddev
*next_mddev
, *mddev
= v
;
7814 spin_lock(&all_mddevs_lock
);
7816 tmp
= all_mddevs
.next
;
7818 tmp
= mddev
->all_mddevs
.next
;
7819 if (tmp
!= &all_mddevs
)
7820 next_mddev
= mddev_get(list_entry(tmp
,struct mddev
,all_mddevs
));
7822 next_mddev
= (void*)2;
7825 spin_unlock(&all_mddevs_lock
);
7833 static void md_seq_stop(struct seq_file
*seq
, void *v
)
7835 struct mddev
*mddev
= v
;
7837 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
7841 static int md_seq_show(struct seq_file
*seq
, void *v
)
7843 struct mddev
*mddev
= v
;
7845 struct md_rdev
*rdev
;
7847 if (v
== (void*)1) {
7848 struct md_personality
*pers
;
7849 seq_printf(seq
, "Personalities : ");
7850 spin_lock(&pers_lock
);
7851 list_for_each_entry(pers
, &pers_list
, list
)
7852 seq_printf(seq
, "[%s] ", pers
->name
);
7854 spin_unlock(&pers_lock
);
7855 seq_printf(seq
, "\n");
7856 seq
->poll_event
= atomic_read(&md_event_count
);
7859 if (v
== (void*)2) {
7864 spin_lock(&mddev
->lock
);
7865 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
7866 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
7867 mddev
->pers
? "" : "in");
7870 seq_printf(seq
, " (read-only)");
7872 seq_printf(seq
, " (auto-read-only)");
7873 seq_printf(seq
, " %s", mddev
->pers
->name
);
7878 rdev_for_each_rcu(rdev
, mddev
) {
7879 char b
[BDEVNAME_SIZE
];
7880 seq_printf(seq
, " %s[%d]",
7881 bdevname(rdev
->bdev
,b
), rdev
->desc_nr
);
7882 if (test_bit(WriteMostly
, &rdev
->flags
))
7883 seq_printf(seq
, "(W)");
7884 if (test_bit(Journal
, &rdev
->flags
))
7885 seq_printf(seq
, "(J)");
7886 if (test_bit(Faulty
, &rdev
->flags
)) {
7887 seq_printf(seq
, "(F)");
7890 if (rdev
->raid_disk
< 0)
7891 seq_printf(seq
, "(S)"); /* spare */
7892 if (test_bit(Replacement
, &rdev
->flags
))
7893 seq_printf(seq
, "(R)");
7894 sectors
+= rdev
->sectors
;
7898 if (!list_empty(&mddev
->disks
)) {
7900 seq_printf(seq
, "\n %llu blocks",
7901 (unsigned long long)
7902 mddev
->array_sectors
/ 2);
7904 seq_printf(seq
, "\n %llu blocks",
7905 (unsigned long long)sectors
/ 2);
7907 if (mddev
->persistent
) {
7908 if (mddev
->major_version
!= 0 ||
7909 mddev
->minor_version
!= 90) {
7910 seq_printf(seq
," super %d.%d",
7911 mddev
->major_version
,
7912 mddev
->minor_version
);
7914 } else if (mddev
->external
)
7915 seq_printf(seq
, " super external:%s",
7916 mddev
->metadata_type
);
7918 seq_printf(seq
, " super non-persistent");
7921 mddev
->pers
->status(seq
, mddev
);
7922 seq_printf(seq
, "\n ");
7923 if (mddev
->pers
->sync_request
) {
7924 if (status_resync(seq
, mddev
))
7925 seq_printf(seq
, "\n ");
7928 seq_printf(seq
, "\n ");
7930 bitmap_status(seq
, mddev
->bitmap
);
7932 seq_printf(seq
, "\n");
7934 spin_unlock(&mddev
->lock
);
7939 static const struct seq_operations md_seq_ops
= {
7940 .start
= md_seq_start
,
7941 .next
= md_seq_next
,
7942 .stop
= md_seq_stop
,
7943 .show
= md_seq_show
,
7946 static int md_seq_open(struct inode
*inode
, struct file
*file
)
7948 struct seq_file
*seq
;
7951 error
= seq_open(file
, &md_seq_ops
);
7955 seq
= file
->private_data
;
7956 seq
->poll_event
= atomic_read(&md_event_count
);
7960 static int md_unloading
;
7961 static unsigned int mdstat_poll(struct file
*filp
, poll_table
*wait
)
7963 struct seq_file
*seq
= filp
->private_data
;
7967 return POLLIN
|POLLRDNORM
|POLLERR
|POLLPRI
;
7968 poll_wait(filp
, &md_event_waiters
, wait
);
7970 /* always allow read */
7971 mask
= POLLIN
| POLLRDNORM
;
7973 if (seq
->poll_event
!= atomic_read(&md_event_count
))
7974 mask
|= POLLERR
| POLLPRI
;
7978 static const struct file_operations md_seq_fops
= {
7979 .owner
= THIS_MODULE
,
7980 .open
= md_seq_open
,
7982 .llseek
= seq_lseek
,
7983 .release
= seq_release
,
7984 .poll
= mdstat_poll
,
7987 int register_md_personality(struct md_personality
*p
)
7989 pr_debug("md: %s personality registered for level %d\n",
7991 spin_lock(&pers_lock
);
7992 list_add_tail(&p
->list
, &pers_list
);
7993 spin_unlock(&pers_lock
);
7996 EXPORT_SYMBOL(register_md_personality
);
7998 int unregister_md_personality(struct md_personality
*p
)
8000 pr_debug("md: %s personality unregistered\n", p
->name
);
8001 spin_lock(&pers_lock
);
8002 list_del_init(&p
->list
);
8003 spin_unlock(&pers_lock
);
8006 EXPORT_SYMBOL(unregister_md_personality
);
8008 int register_md_cluster_operations(struct md_cluster_operations
*ops
,
8009 struct module
*module
)
8012 spin_lock(&pers_lock
);
8013 if (md_cluster_ops
!= NULL
)
8016 md_cluster_ops
= ops
;
8017 md_cluster_mod
= module
;
8019 spin_unlock(&pers_lock
);
8022 EXPORT_SYMBOL(register_md_cluster_operations
);
8024 int unregister_md_cluster_operations(void)
8026 spin_lock(&pers_lock
);
8027 md_cluster_ops
= NULL
;
8028 spin_unlock(&pers_lock
);
8031 EXPORT_SYMBOL(unregister_md_cluster_operations
);
8033 int md_setup_cluster(struct mddev
*mddev
, int nodes
)
8035 if (!md_cluster_ops
)
8036 request_module("md-cluster");
8037 spin_lock(&pers_lock
);
8038 /* ensure module won't be unloaded */
8039 if (!md_cluster_ops
|| !try_module_get(md_cluster_mod
)) {
8040 pr_warn("can't find md-cluster module or get it's reference.\n");
8041 spin_unlock(&pers_lock
);
8044 spin_unlock(&pers_lock
);
8046 return md_cluster_ops
->join(mddev
, nodes
);
8049 void md_cluster_stop(struct mddev
*mddev
)
8051 if (!md_cluster_ops
)
8053 md_cluster_ops
->leave(mddev
);
8054 module_put(md_cluster_mod
);
8057 static int is_mddev_idle(struct mddev
*mddev
, int init
)
8059 struct md_rdev
*rdev
;
8065 rdev_for_each_rcu(rdev
, mddev
) {
8066 struct gendisk
*disk
= rdev
->bdev
->bd_contains
->bd_disk
;
8067 curr_events
= (int)part_stat_read(&disk
->part0
, sectors
[0]) +
8068 (int)part_stat_read(&disk
->part0
, sectors
[1]) -
8069 atomic_read(&disk
->sync_io
);
8070 /* sync IO will cause sync_io to increase before the disk_stats
8071 * as sync_io is counted when a request starts, and
8072 * disk_stats is counted when it completes.
8073 * So resync activity will cause curr_events to be smaller than
8074 * when there was no such activity.
8075 * non-sync IO will cause disk_stat to increase without
8076 * increasing sync_io so curr_events will (eventually)
8077 * be larger than it was before. Once it becomes
8078 * substantially larger, the test below will cause
8079 * the array to appear non-idle, and resync will slow
8081 * If there is a lot of outstanding resync activity when
8082 * we set last_event to curr_events, then all that activity
8083 * completing might cause the array to appear non-idle
8084 * and resync will be slowed down even though there might
8085 * not have been non-resync activity. This will only
8086 * happen once though. 'last_events' will soon reflect
8087 * the state where there is little or no outstanding
8088 * resync requests, and further resync activity will
8089 * always make curr_events less than last_events.
8092 if (init
|| curr_events
- rdev
->last_events
> 64) {
8093 rdev
->last_events
= curr_events
;
8101 void md_done_sync(struct mddev
*mddev
, int blocks
, int ok
)
8103 /* another "blocks" (512byte) blocks have been synced */
8104 atomic_sub(blocks
, &mddev
->recovery_active
);
8105 wake_up(&mddev
->recovery_wait
);
8107 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8108 set_bit(MD_RECOVERY_ERROR
, &mddev
->recovery
);
8109 md_wakeup_thread(mddev
->thread
);
8110 // stop recovery, signal do_sync ....
8113 EXPORT_SYMBOL(md_done_sync
);
8115 /* md_write_start(mddev, bi)
8116 * If we need to update some array metadata (e.g. 'active' flag
8117 * in superblock) before writing, schedule a superblock update
8118 * and wait for it to complete.
8119 * A return value of 'false' means that the write wasn't recorded
8120 * and cannot proceed as the array is being suspend.
8122 bool md_write_start(struct mddev
*mddev
, struct bio
*bi
)
8126 if (bio_data_dir(bi
) != WRITE
)
8129 BUG_ON(mddev
->ro
== 1);
8130 if (mddev
->ro
== 2) {
8131 /* need to switch to read/write */
8133 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
8134 md_wakeup_thread(mddev
->thread
);
8135 md_wakeup_thread(mddev
->sync_thread
);
8139 percpu_ref_get(&mddev
->writes_pending
);
8140 smp_mb(); /* Match smp_mb in set_in_sync() */
8141 if (mddev
->safemode
== 1)
8142 mddev
->safemode
= 0;
8143 /* sync_checkers is always 0 when writes_pending is in per-cpu mode */
8144 if (mddev
->in_sync
|| mddev
->sync_checkers
) {
8145 spin_lock(&mddev
->lock
);
8146 if (mddev
->in_sync
) {
8148 set_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
8149 set_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
8150 md_wakeup_thread(mddev
->thread
);
8153 spin_unlock(&mddev
->lock
);
8157 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
8158 if (!mddev
->has_superblocks
)
8160 wait_event(mddev
->sb_wait
,
8161 !test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
) ||
8163 if (test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
)) {
8164 percpu_ref_put(&mddev
->writes_pending
);
8169 EXPORT_SYMBOL(md_write_start
);
8171 /* md_write_inc can only be called when md_write_start() has
8172 * already been called at least once of the current request.
8173 * It increments the counter and is useful when a single request
8174 * is split into several parts. Each part causes an increment and
8175 * so needs a matching md_write_end().
8176 * Unlike md_write_start(), it is safe to call md_write_inc() inside
8177 * a spinlocked region.
8179 void md_write_inc(struct mddev
*mddev
, struct bio
*bi
)
8181 if (bio_data_dir(bi
) != WRITE
)
8183 WARN_ON_ONCE(mddev
->in_sync
|| mddev
->ro
);
8184 percpu_ref_get(&mddev
->writes_pending
);
8186 EXPORT_SYMBOL(md_write_inc
);
8188 void md_write_end(struct mddev
*mddev
)
8190 percpu_ref_put(&mddev
->writes_pending
);
8192 if (mddev
->safemode
== 2)
8193 md_wakeup_thread(mddev
->thread
);
8194 else if (mddev
->safemode_delay
)
8195 /* The roundup() ensures this only performs locking once
8196 * every ->safemode_delay jiffies
8198 mod_timer(&mddev
->safemode_timer
,
8199 roundup(jiffies
, mddev
->safemode_delay
) +
8200 mddev
->safemode_delay
);
8203 EXPORT_SYMBOL(md_write_end
);
8205 /* md_allow_write(mddev)
8206 * Calling this ensures that the array is marked 'active' so that writes
8207 * may proceed without blocking. It is important to call this before
8208 * attempting a GFP_KERNEL allocation while holding the mddev lock.
8209 * Must be called with mddev_lock held.
8211 void md_allow_write(struct mddev
*mddev
)
8217 if (!mddev
->pers
->sync_request
)
8220 spin_lock(&mddev
->lock
);
8221 if (mddev
->in_sync
) {
8223 set_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
8224 set_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
8225 if (mddev
->safemode_delay
&&
8226 mddev
->safemode
== 0)
8227 mddev
->safemode
= 1;
8228 spin_unlock(&mddev
->lock
);
8229 md_update_sb(mddev
, 0);
8230 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
8231 /* wait for the dirty state to be recorded in the metadata */
8232 wait_event(mddev
->sb_wait
,
8233 !test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
));
8235 spin_unlock(&mddev
->lock
);
8237 EXPORT_SYMBOL_GPL(md_allow_write
);
8239 #define SYNC_MARKS 10
8240 #define SYNC_MARK_STEP (3*HZ)
8241 #define UPDATE_FREQUENCY (5*60*HZ)
8242 void md_do_sync(struct md_thread
*thread
)
8244 struct mddev
*mddev
= thread
->mddev
;
8245 struct mddev
*mddev2
;
8246 unsigned int currspeed
= 0,
8248 sector_t max_sectors
,j
, io_sectors
, recovery_done
;
8249 unsigned long mark
[SYNC_MARKS
];
8250 unsigned long update_time
;
8251 sector_t mark_cnt
[SYNC_MARKS
];
8253 struct list_head
*tmp
;
8254 sector_t last_check
;
8256 struct md_rdev
*rdev
;
8257 char *desc
, *action
= NULL
;
8258 struct blk_plug plug
;
8261 /* just incase thread restarts... */
8262 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
8264 if (mddev
->ro
) {/* never try to sync a read-only array */
8265 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8269 if (mddev_is_clustered(mddev
)) {
8270 ret
= md_cluster_ops
->resync_start(mddev
);
8274 set_bit(MD_CLUSTER_RESYNC_LOCKED
, &mddev
->flags
);
8275 if (!(test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
8276 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) ||
8277 test_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
))
8278 && ((unsigned long long)mddev
->curr_resync_completed
8279 < (unsigned long long)mddev
->resync_max_sectors
))
8283 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
8284 if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)) {
8285 desc
= "data-check";
8287 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
8288 desc
= "requested-resync";
8292 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
8297 mddev
->last_sync_action
= action
?: desc
;
8299 /* we overload curr_resync somewhat here.
8300 * 0 == not engaged in resync at all
8301 * 2 == checking that there is no conflict with another sync
8302 * 1 == like 2, but have yielded to allow conflicting resync to
8304 * other == active in resync - this many blocks
8306 * Before starting a resync we must have set curr_resync to
8307 * 2, and then checked that every "conflicting" array has curr_resync
8308 * less than ours. When we find one that is the same or higher
8309 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
8310 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
8311 * This will mean we have to start checking from the beginning again.
8316 int mddev2_minor
= -1;
8317 mddev
->curr_resync
= 2;
8320 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
8322 for_each_mddev(mddev2
, tmp
) {
8323 if (mddev2
== mddev
)
8325 if (!mddev
->parallel_resync
8326 && mddev2
->curr_resync
8327 && match_mddev_units(mddev
, mddev2
)) {
8329 if (mddev
< mddev2
&& mddev
->curr_resync
== 2) {
8330 /* arbitrarily yield */
8331 mddev
->curr_resync
= 1;
8332 wake_up(&resync_wait
);
8334 if (mddev
> mddev2
&& mddev
->curr_resync
== 1)
8335 /* no need to wait here, we can wait the next
8336 * time 'round when curr_resync == 2
8339 /* We need to wait 'interruptible' so as not to
8340 * contribute to the load average, and not to
8341 * be caught by 'softlockup'
8343 prepare_to_wait(&resync_wait
, &wq
, TASK_INTERRUPTIBLE
);
8344 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
8345 mddev2
->curr_resync
>= mddev
->curr_resync
) {
8346 if (mddev2_minor
!= mddev2
->md_minor
) {
8347 mddev2_minor
= mddev2
->md_minor
;
8348 pr_info("md: delaying %s of %s until %s has finished (they share one or more physical units)\n",
8349 desc
, mdname(mddev
),
8353 if (signal_pending(current
))
8354 flush_signals(current
);
8356 finish_wait(&resync_wait
, &wq
);
8359 finish_wait(&resync_wait
, &wq
);
8362 } while (mddev
->curr_resync
< 2);
8365 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
8366 /* resync follows the size requested by the personality,
8367 * which defaults to physical size, but can be virtual size
8369 max_sectors
= mddev
->resync_max_sectors
;
8370 atomic64_set(&mddev
->resync_mismatches
, 0);
8371 /* we don't use the checkpoint if there's a bitmap */
8372 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
8373 j
= mddev
->resync_min
;
8374 else if (!mddev
->bitmap
)
8375 j
= mddev
->recovery_cp
;
8377 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
8378 max_sectors
= mddev
->resync_max_sectors
;
8380 /* recovery follows the physical size of devices */
8381 max_sectors
= mddev
->dev_sectors
;
8384 rdev_for_each_rcu(rdev
, mddev
)
8385 if (rdev
->raid_disk
>= 0 &&
8386 !test_bit(Journal
, &rdev
->flags
) &&
8387 !test_bit(Faulty
, &rdev
->flags
) &&
8388 !test_bit(In_sync
, &rdev
->flags
) &&
8389 rdev
->recovery_offset
< j
)
8390 j
= rdev
->recovery_offset
;
8393 /* If there is a bitmap, we need to make sure all
8394 * writes that started before we added a spare
8395 * complete before we start doing a recovery.
8396 * Otherwise the write might complete and (via
8397 * bitmap_endwrite) set a bit in the bitmap after the
8398 * recovery has checked that bit and skipped that
8401 if (mddev
->bitmap
) {
8402 mddev
->pers
->quiesce(mddev
, 1);
8403 mddev
->pers
->quiesce(mddev
, 0);
8407 pr_info("md: %s of RAID array %s\n", desc
, mdname(mddev
));
8408 pr_debug("md: minimum _guaranteed_ speed: %d KB/sec/disk.\n", speed_min(mddev
));
8409 pr_debug("md: using maximum available idle IO bandwidth (but not more than %d KB/sec) for %s.\n",
8410 speed_max(mddev
), desc
);
8412 is_mddev_idle(mddev
, 1); /* this initializes IO event counters */
8415 for (m
= 0; m
< SYNC_MARKS
; m
++) {
8417 mark_cnt
[m
] = io_sectors
;
8420 mddev
->resync_mark
= mark
[last_mark
];
8421 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
8424 * Tune reconstruction:
8426 window
= 32*(PAGE_SIZE
/512);
8427 pr_debug("md: using %dk window, over a total of %lluk.\n",
8428 window
/2, (unsigned long long)max_sectors
/2);
8430 atomic_set(&mddev
->recovery_active
, 0);
8434 pr_debug("md: resuming %s of %s from checkpoint.\n",
8435 desc
, mdname(mddev
));
8436 mddev
->curr_resync
= j
;
8438 mddev
->curr_resync
= 3; /* no longer delayed */
8439 mddev
->curr_resync_completed
= j
;
8440 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
8441 md_new_event(mddev
);
8442 update_time
= jiffies
;
8444 blk_start_plug(&plug
);
8445 while (j
< max_sectors
) {
8450 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
8451 ((mddev
->curr_resync
> mddev
->curr_resync_completed
&&
8452 (mddev
->curr_resync
- mddev
->curr_resync_completed
)
8453 > (max_sectors
>> 4)) ||
8454 time_after_eq(jiffies
, update_time
+ UPDATE_FREQUENCY
) ||
8455 (j
- mddev
->curr_resync_completed
)*2
8456 >= mddev
->resync_max
- mddev
->curr_resync_completed
||
8457 mddev
->curr_resync_completed
> mddev
->resync_max
8459 /* time to update curr_resync_completed */
8460 wait_event(mddev
->recovery_wait
,
8461 atomic_read(&mddev
->recovery_active
) == 0);
8462 mddev
->curr_resync_completed
= j
;
8463 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) &&
8464 j
> mddev
->recovery_cp
)
8465 mddev
->recovery_cp
= j
;
8466 update_time
= jiffies
;
8467 set_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
8468 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
8471 while (j
>= mddev
->resync_max
&&
8472 !test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
8473 /* As this condition is controlled by user-space,
8474 * we can block indefinitely, so use '_interruptible'
8475 * to avoid triggering warnings.
8477 flush_signals(current
); /* just in case */
8478 wait_event_interruptible(mddev
->recovery_wait
,
8479 mddev
->resync_max
> j
8480 || test_bit(MD_RECOVERY_INTR
,
8484 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
8487 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
);
8489 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8493 if (!skipped
) { /* actual IO requested */
8494 io_sectors
+= sectors
;
8495 atomic_add(sectors
, &mddev
->recovery_active
);
8498 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
8502 if (j
> max_sectors
)
8503 /* when skipping, extra large numbers can be returned. */
8506 mddev
->curr_resync
= j
;
8507 mddev
->curr_mark_cnt
= io_sectors
;
8508 if (last_check
== 0)
8509 /* this is the earliest that rebuild will be
8510 * visible in /proc/mdstat
8512 md_new_event(mddev
);
8514 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
8517 last_check
= io_sectors
;
8519 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
8521 int next
= (last_mark
+1) % SYNC_MARKS
;
8523 mddev
->resync_mark
= mark
[next
];
8524 mddev
->resync_mark_cnt
= mark_cnt
[next
];
8525 mark
[next
] = jiffies
;
8526 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
8530 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
8534 * this loop exits only if either when we are slower than
8535 * the 'hard' speed limit, or the system was IO-idle for
8537 * the system might be non-idle CPU-wise, but we only care
8538 * about not overloading the IO subsystem. (things like an
8539 * e2fsck being done on the RAID array should execute fast)
8543 recovery_done
= io_sectors
- atomic_read(&mddev
->recovery_active
);
8544 currspeed
= ((unsigned long)(recovery_done
- mddev
->resync_mark_cnt
))/2
8545 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
8547 if (currspeed
> speed_min(mddev
)) {
8548 if (currspeed
> speed_max(mddev
)) {
8552 if (!is_mddev_idle(mddev
, 0)) {
8554 * Give other IO more of a chance.
8555 * The faster the devices, the less we wait.
8557 wait_event(mddev
->recovery_wait
,
8558 !atomic_read(&mddev
->recovery_active
));
8562 pr_info("md: %s: %s %s.\n",mdname(mddev
), desc
,
8563 test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)
8564 ? "interrupted" : "done");
8566 * this also signals 'finished resyncing' to md_stop
8568 blk_finish_plug(&plug
);
8569 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
8571 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
8572 !test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
8573 mddev
->curr_resync
> 3) {
8574 mddev
->curr_resync_completed
= mddev
->curr_resync
;
8575 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
8577 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
);
8579 if (!test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
) &&
8580 mddev
->curr_resync
> 3) {
8581 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
8582 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
8583 if (mddev
->curr_resync
>= mddev
->recovery_cp
) {
8584 pr_debug("md: checkpointing %s of %s.\n",
8585 desc
, mdname(mddev
));
8586 if (test_bit(MD_RECOVERY_ERROR
,
8588 mddev
->recovery_cp
=
8589 mddev
->curr_resync_completed
;
8591 mddev
->recovery_cp
=
8595 mddev
->recovery_cp
= MaxSector
;
8597 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
8598 mddev
->curr_resync
= MaxSector
;
8599 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
8600 test_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
)) {
8602 rdev_for_each_rcu(rdev
, mddev
)
8603 if (rdev
->raid_disk
>= 0 &&
8604 mddev
->delta_disks
>= 0 &&
8605 !test_bit(Journal
, &rdev
->flags
) &&
8606 !test_bit(Faulty
, &rdev
->flags
) &&
8607 !test_bit(In_sync
, &rdev
->flags
) &&
8608 rdev
->recovery_offset
< mddev
->curr_resync
)
8609 rdev
->recovery_offset
= mddev
->curr_resync
;
8615 /* set CHANGE_PENDING here since maybe another update is needed,
8616 * so other nodes are informed. It should be harmless for normal
8618 set_mask_bits(&mddev
->sb_flags
, 0,
8619 BIT(MD_SB_CHANGE_PENDING
) | BIT(MD_SB_CHANGE_DEVS
));
8621 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
8622 !test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
8623 mddev
->delta_disks
> 0 &&
8624 mddev
->pers
->finish_reshape
&&
8625 mddev
->pers
->size
&&
8627 mddev_lock_nointr(mddev
);
8628 md_set_array_sectors(mddev
, mddev
->pers
->size(mddev
, 0, 0));
8629 mddev_unlock(mddev
);
8630 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
8631 revalidate_disk(mddev
->gendisk
);
8634 spin_lock(&mddev
->lock
);
8635 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
8636 /* We completed so min/max setting can be forgotten if used. */
8637 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
8638 mddev
->resync_min
= 0;
8639 mddev
->resync_max
= MaxSector
;
8640 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
8641 mddev
->resync_min
= mddev
->curr_resync_completed
;
8642 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
8643 mddev
->curr_resync
= 0;
8644 spin_unlock(&mddev
->lock
);
8646 wake_up(&resync_wait
);
8647 md_wakeup_thread(mddev
->thread
);
8650 EXPORT_SYMBOL_GPL(md_do_sync
);
8652 static int remove_and_add_spares(struct mddev
*mddev
,
8653 struct md_rdev
*this)
8655 struct md_rdev
*rdev
;
8658 bool remove_some
= false;
8660 if (this && test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
8661 /* Mustn't remove devices when resync thread is running */
8664 rdev_for_each(rdev
, mddev
) {
8665 if ((this == NULL
|| rdev
== this) &&
8666 rdev
->raid_disk
>= 0 &&
8667 !test_bit(Blocked
, &rdev
->flags
) &&
8668 test_bit(Faulty
, &rdev
->flags
) &&
8669 atomic_read(&rdev
->nr_pending
)==0) {
8670 /* Faulty non-Blocked devices with nr_pending == 0
8671 * never get nr_pending incremented,
8672 * never get Faulty cleared, and never get Blocked set.
8673 * So we can synchronize_rcu now rather than once per device
8676 set_bit(RemoveSynchronized
, &rdev
->flags
);
8682 rdev_for_each(rdev
, mddev
) {
8683 if ((this == NULL
|| rdev
== this) &&
8684 rdev
->raid_disk
>= 0 &&
8685 !test_bit(Blocked
, &rdev
->flags
) &&
8686 ((test_bit(RemoveSynchronized
, &rdev
->flags
) ||
8687 (!test_bit(In_sync
, &rdev
->flags
) &&
8688 !test_bit(Journal
, &rdev
->flags
))) &&
8689 atomic_read(&rdev
->nr_pending
)==0)) {
8690 if (mddev
->pers
->hot_remove_disk(
8691 mddev
, rdev
) == 0) {
8692 sysfs_unlink_rdev(mddev
, rdev
);
8693 rdev
->saved_raid_disk
= rdev
->raid_disk
;
8694 rdev
->raid_disk
= -1;
8698 if (remove_some
&& test_bit(RemoveSynchronized
, &rdev
->flags
))
8699 clear_bit(RemoveSynchronized
, &rdev
->flags
);
8702 if (removed
&& mddev
->kobj
.sd
)
8703 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
8705 if (this && removed
)
8708 rdev_for_each(rdev
, mddev
) {
8709 if (this && this != rdev
)
8711 if (test_bit(Candidate
, &rdev
->flags
))
8713 if (rdev
->raid_disk
>= 0 &&
8714 !test_bit(In_sync
, &rdev
->flags
) &&
8715 !test_bit(Journal
, &rdev
->flags
) &&
8716 !test_bit(Faulty
, &rdev
->flags
))
8718 if (rdev
->raid_disk
>= 0)
8720 if (test_bit(Faulty
, &rdev
->flags
))
8722 if (!test_bit(Journal
, &rdev
->flags
)) {
8724 ! (rdev
->saved_raid_disk
>= 0 &&
8725 !test_bit(Bitmap_sync
, &rdev
->flags
)))
8728 rdev
->recovery_offset
= 0;
8731 hot_add_disk(mddev
, rdev
) == 0) {
8732 if (sysfs_link_rdev(mddev
, rdev
))
8733 /* failure here is OK */;
8734 if (!test_bit(Journal
, &rdev
->flags
))
8736 md_new_event(mddev
);
8737 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
8742 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
8746 static void md_start_sync(struct work_struct
*ws
)
8748 struct mddev
*mddev
= container_of(ws
, struct mddev
, del_work
);
8750 mddev
->sync_thread
= md_register_thread(md_do_sync
,
8753 if (!mddev
->sync_thread
) {
8754 pr_warn("%s: could not start resync thread...\n",
8756 /* leave the spares where they are, it shouldn't hurt */
8757 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8758 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
8759 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
8760 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
8761 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8762 wake_up(&resync_wait
);
8763 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
8765 if (mddev
->sysfs_action
)
8766 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
8768 md_wakeup_thread(mddev
->sync_thread
);
8769 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
8770 md_new_event(mddev
);
8774 * This routine is regularly called by all per-raid-array threads to
8775 * deal with generic issues like resync and super-block update.
8776 * Raid personalities that don't have a thread (linear/raid0) do not
8777 * need this as they never do any recovery or update the superblock.
8779 * It does not do any resync itself, but rather "forks" off other threads
8780 * to do that as needed.
8781 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
8782 * "->recovery" and create a thread at ->sync_thread.
8783 * When the thread finishes it sets MD_RECOVERY_DONE
8784 * and wakeups up this thread which will reap the thread and finish up.
8785 * This thread also removes any faulty devices (with nr_pending == 0).
8787 * The overall approach is:
8788 * 1/ if the superblock needs updating, update it.
8789 * 2/ If a recovery thread is running, don't do anything else.
8790 * 3/ If recovery has finished, clean up, possibly marking spares active.
8791 * 4/ If there are any faulty devices, remove them.
8792 * 5/ If array is degraded, try to add spares devices
8793 * 6/ If array has spares or is not in-sync, start a resync thread.
8795 void md_check_recovery(struct mddev
*mddev
)
8797 if (test_bit(MD_ALLOW_SB_UPDATE
, &mddev
->flags
) && mddev
->sb_flags
) {
8798 /* Write superblock - thread that called mddev_suspend()
8799 * holds reconfig_mutex for us.
8801 set_bit(MD_UPDATING_SB
, &mddev
->flags
);
8802 smp_mb__after_atomic();
8803 if (test_bit(MD_ALLOW_SB_UPDATE
, &mddev
->flags
))
8804 md_update_sb(mddev
, 0);
8805 clear_bit_unlock(MD_UPDATING_SB
, &mddev
->flags
);
8806 wake_up(&mddev
->sb_wait
);
8809 if (mddev
->suspended
)
8813 bitmap_daemon_work(mddev
);
8815 if (signal_pending(current
)) {
8816 if (mddev
->pers
->sync_request
&& !mddev
->external
) {
8817 pr_debug("md: %s in immediate safe mode\n",
8819 mddev
->safemode
= 2;
8821 flush_signals(current
);
8824 if (mddev
->ro
&& !test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
8827 (mddev
->sb_flags
& ~ (1<<MD_SB_CHANGE_PENDING
)) ||
8828 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
8829 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
8830 (mddev
->external
== 0 && mddev
->safemode
== 1) ||
8831 (mddev
->safemode
== 2
8832 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
8836 if (mddev_trylock(mddev
)) {
8838 bool try_set_sync
= mddev
->safemode
!= 0;
8840 if (!mddev
->external
&& mddev
->safemode
== 1)
8841 mddev
->safemode
= 0;
8844 struct md_rdev
*rdev
;
8845 if (!mddev
->external
&& mddev
->in_sync
)
8846 /* 'Blocked' flag not needed as failed devices
8847 * will be recorded if array switched to read/write.
8848 * Leaving it set will prevent the device
8849 * from being removed.
8851 rdev_for_each(rdev
, mddev
)
8852 clear_bit(Blocked
, &rdev
->flags
);
8853 /* On a read-only array we can:
8854 * - remove failed devices
8855 * - add already-in_sync devices if the array itself
8857 * As we only add devices that are already in-sync,
8858 * we can activate the spares immediately.
8860 remove_and_add_spares(mddev
, NULL
);
8861 /* There is no thread, but we need to call
8862 * ->spare_active and clear saved_raid_disk
8864 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8865 md_reap_sync_thread(mddev
);
8866 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8867 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
8868 clear_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
8872 if (mddev_is_clustered(mddev
)) {
8873 struct md_rdev
*rdev
;
8874 /* kick the device if another node issued a
8877 rdev_for_each(rdev
, mddev
) {
8878 if (test_and_clear_bit(ClusterRemove
, &rdev
->flags
) &&
8879 rdev
->raid_disk
< 0)
8880 md_kick_rdev_from_array(rdev
);
8884 if (try_set_sync
&& !mddev
->external
&& !mddev
->in_sync
) {
8885 spin_lock(&mddev
->lock
);
8887 spin_unlock(&mddev
->lock
);
8890 if (mddev
->sb_flags
)
8891 md_update_sb(mddev
, 0);
8893 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
8894 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
8895 /* resync/recovery still happening */
8896 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
8899 if (mddev
->sync_thread
) {
8900 md_reap_sync_thread(mddev
);
8903 /* Set RUNNING before clearing NEEDED to avoid
8904 * any transients in the value of "sync_action".
8906 mddev
->curr_resync_completed
= 0;
8907 spin_lock(&mddev
->lock
);
8908 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8909 spin_unlock(&mddev
->lock
);
8910 /* Clear some bits that don't mean anything, but
8913 clear_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8914 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
8916 if (!test_and_clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
8917 test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
8919 /* no recovery is running.
8920 * remove any failed drives, then
8921 * add spares if possible.
8922 * Spares are also removed and re-added, to allow
8923 * the personality to fail the re-add.
8926 if (mddev
->reshape_position
!= MaxSector
) {
8927 if (mddev
->pers
->check_reshape
== NULL
||
8928 mddev
->pers
->check_reshape(mddev
) != 0)
8929 /* Cannot proceed */
8931 set_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
8932 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8933 } else if ((spares
= remove_and_add_spares(mddev
, NULL
))) {
8934 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8935 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
8936 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
8937 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8938 } else if (mddev
->recovery_cp
< MaxSector
) {
8939 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8940 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8941 } else if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
8942 /* nothing to be done ... */
8945 if (mddev
->pers
->sync_request
) {
8947 /* We are adding a device or devices to an array
8948 * which has the bitmap stored on all devices.
8949 * So make sure all bitmap pages get written
8951 bitmap_write_all(mddev
->bitmap
);
8953 INIT_WORK(&mddev
->del_work
, md_start_sync
);
8954 queue_work(md_misc_wq
, &mddev
->del_work
);
8958 if (!mddev
->sync_thread
) {
8959 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8960 wake_up(&resync_wait
);
8961 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
8963 if (mddev
->sysfs_action
)
8964 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
8967 wake_up(&mddev
->sb_wait
);
8968 mddev_unlock(mddev
);
8971 EXPORT_SYMBOL(md_check_recovery
);
8973 void md_reap_sync_thread(struct mddev
*mddev
)
8975 struct md_rdev
*rdev
;
8977 /* resync has finished, collect result */
8978 md_unregister_thread(&mddev
->sync_thread
);
8979 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
8980 !test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
) &&
8981 mddev
->degraded
!= mddev
->raid_disks
) {
8983 /* activate any spares */
8984 if (mddev
->pers
->spare_active(mddev
)) {
8985 sysfs_notify(&mddev
->kobj
, NULL
,
8987 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
8990 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
8991 mddev
->pers
->finish_reshape
)
8992 mddev
->pers
->finish_reshape(mddev
);
8994 /* If array is no-longer degraded, then any saved_raid_disk
8995 * information must be scrapped.
8997 if (!mddev
->degraded
)
8998 rdev_for_each(rdev
, mddev
)
8999 rdev
->saved_raid_disk
= -1;
9001 md_update_sb(mddev
, 1);
9002 /* MD_SB_CHANGE_PENDING should be cleared by md_update_sb, so we can
9003 * call resync_finish here if MD_CLUSTER_RESYNC_LOCKED is set by
9005 if (test_and_clear_bit(MD_CLUSTER_RESYNC_LOCKED
, &mddev
->flags
))
9006 md_cluster_ops
->resync_finish(mddev
);
9007 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
9008 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
9009 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
9010 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
9011 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
9012 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
9013 wake_up(&resync_wait
);
9014 /* flag recovery needed just to double check */
9015 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
9016 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
9017 md_new_event(mddev
);
9018 if (mddev
->event_work
.func
)
9019 queue_work(md_misc_wq
, &mddev
->event_work
);
9021 EXPORT_SYMBOL(md_reap_sync_thread
);
9023 void md_wait_for_blocked_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
9025 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
9026 wait_event_timeout(rdev
->blocked_wait
,
9027 !test_bit(Blocked
, &rdev
->flags
) &&
9028 !test_bit(BlockedBadBlocks
, &rdev
->flags
),
9029 msecs_to_jiffies(5000));
9030 rdev_dec_pending(rdev
, mddev
);
9032 EXPORT_SYMBOL(md_wait_for_blocked_rdev
);
9034 void md_finish_reshape(struct mddev
*mddev
)
9036 /* called be personality module when reshape completes. */
9037 struct md_rdev
*rdev
;
9039 rdev_for_each(rdev
, mddev
) {
9040 if (rdev
->data_offset
> rdev
->new_data_offset
)
9041 rdev
->sectors
+= rdev
->data_offset
- rdev
->new_data_offset
;
9043 rdev
->sectors
-= rdev
->new_data_offset
- rdev
->data_offset
;
9044 rdev
->data_offset
= rdev
->new_data_offset
;
9047 EXPORT_SYMBOL(md_finish_reshape
);
9049 /* Bad block management */
9051 /* Returns 1 on success, 0 on failure */
9052 int rdev_set_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
9055 struct mddev
*mddev
= rdev
->mddev
;
9058 s
+= rdev
->new_data_offset
;
9060 s
+= rdev
->data_offset
;
9061 rv
= badblocks_set(&rdev
->badblocks
, s
, sectors
, 0);
9063 /* Make sure they get written out promptly */
9064 if (test_bit(ExternalBbl
, &rdev
->flags
))
9065 sysfs_notify(&rdev
->kobj
, NULL
,
9066 "unacknowledged_bad_blocks");
9067 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
9068 set_mask_bits(&mddev
->sb_flags
, 0,
9069 BIT(MD_SB_CHANGE_CLEAN
) | BIT(MD_SB_CHANGE_PENDING
));
9070 md_wakeup_thread(rdev
->mddev
->thread
);
9075 EXPORT_SYMBOL_GPL(rdev_set_badblocks
);
9077 int rdev_clear_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
9082 s
+= rdev
->new_data_offset
;
9084 s
+= rdev
->data_offset
;
9085 rv
= badblocks_clear(&rdev
->badblocks
, s
, sectors
);
9086 if ((rv
== 0) && test_bit(ExternalBbl
, &rdev
->flags
))
9087 sysfs_notify(&rdev
->kobj
, NULL
, "bad_blocks");
9090 EXPORT_SYMBOL_GPL(rdev_clear_badblocks
);
9092 static int md_notify_reboot(struct notifier_block
*this,
9093 unsigned long code
, void *x
)
9095 struct list_head
*tmp
;
9096 struct mddev
*mddev
;
9099 for_each_mddev(mddev
, tmp
) {
9100 if (mddev_trylock(mddev
)) {
9102 __md_stop_writes(mddev
);
9103 if (mddev
->persistent
)
9104 mddev
->safemode
= 2;
9105 mddev_unlock(mddev
);
9110 * certain more exotic SCSI devices are known to be
9111 * volatile wrt too early system reboots. While the
9112 * right place to handle this issue is the given
9113 * driver, we do want to have a safe RAID driver ...
9121 static struct notifier_block md_notifier
= {
9122 .notifier_call
= md_notify_reboot
,
9124 .priority
= INT_MAX
, /* before any real devices */
9127 static void md_geninit(void)
9129 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
9131 proc_create("mdstat", S_IRUGO
, NULL
, &md_seq_fops
);
9134 static int __init
md_init(void)
9138 md_wq
= alloc_workqueue("md", WQ_MEM_RECLAIM
, 0);
9142 md_misc_wq
= alloc_workqueue("md_misc", 0, 0);
9146 if ((ret
= register_blkdev(MD_MAJOR
, "md")) < 0)
9149 if ((ret
= register_blkdev(0, "mdp")) < 0)
9153 blk_register_region(MKDEV(MD_MAJOR
, 0), 512, THIS_MODULE
,
9154 md_probe
, NULL
, NULL
);
9155 blk_register_region(MKDEV(mdp_major
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
9156 md_probe
, NULL
, NULL
);
9158 register_reboot_notifier(&md_notifier
);
9159 raid_table_header
= register_sysctl_table(raid_root_table
);
9165 unregister_blkdev(MD_MAJOR
, "md");
9167 destroy_workqueue(md_misc_wq
);
9169 destroy_workqueue(md_wq
);
9174 static void check_sb_changes(struct mddev
*mddev
, struct md_rdev
*rdev
)
9176 struct mdp_superblock_1
*sb
= page_address(rdev
->sb_page
);
9177 struct md_rdev
*rdev2
;
9179 char b
[BDEVNAME_SIZE
];
9182 * If size is changed in another node then we need to
9183 * do resize as well.
9185 if (mddev
->dev_sectors
!= le64_to_cpu(sb
->size
)) {
9186 ret
= mddev
->pers
->resize(mddev
, le64_to_cpu(sb
->size
));
9188 pr_info("md-cluster: resize failed\n");
9190 bitmap_update_sb(mddev
->bitmap
);
9193 /* Check for change of roles in the active devices */
9194 rdev_for_each(rdev2
, mddev
) {
9195 if (test_bit(Faulty
, &rdev2
->flags
))
9198 /* Check if the roles changed */
9199 role
= le16_to_cpu(sb
->dev_roles
[rdev2
->desc_nr
]);
9201 if (test_bit(Candidate
, &rdev2
->flags
)) {
9202 if (role
== 0xfffe) {
9203 pr_info("md: Removing Candidate device %s because add failed\n", bdevname(rdev2
->bdev
,b
));
9204 md_kick_rdev_from_array(rdev2
);
9208 clear_bit(Candidate
, &rdev2
->flags
);
9211 if (role
!= rdev2
->raid_disk
) {
9213 if (rdev2
->raid_disk
== -1 && role
!= 0xffff) {
9214 rdev2
->saved_raid_disk
= role
;
9215 ret
= remove_and_add_spares(mddev
, rdev2
);
9216 pr_info("Activated spare: %s\n",
9217 bdevname(rdev2
->bdev
,b
));
9218 /* wakeup mddev->thread here, so array could
9219 * perform resync with the new activated disk */
9220 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
9221 md_wakeup_thread(mddev
->thread
);
9225 * We just want to do the minimum to mark the disk
9226 * as faulty. The recovery is performed by the
9227 * one who initiated the error.
9229 if ((role
== 0xfffe) || (role
== 0xfffd)) {
9230 md_error(mddev
, rdev2
);
9231 clear_bit(Blocked
, &rdev2
->flags
);
9236 if (mddev
->raid_disks
!= le32_to_cpu(sb
->raid_disks
))
9237 update_raid_disks(mddev
, le32_to_cpu(sb
->raid_disks
));
9239 /* Finally set the event to be up to date */
9240 mddev
->events
= le64_to_cpu(sb
->events
);
9243 static int read_rdev(struct mddev
*mddev
, struct md_rdev
*rdev
)
9246 struct page
*swapout
= rdev
->sb_page
;
9247 struct mdp_superblock_1
*sb
;
9249 /* Store the sb page of the rdev in the swapout temporary
9250 * variable in case we err in the future
9252 rdev
->sb_page
= NULL
;
9253 err
= alloc_disk_sb(rdev
);
9255 ClearPageUptodate(rdev
->sb_page
);
9256 rdev
->sb_loaded
= 0;
9257 err
= super_types
[mddev
->major_version
].
9258 load_super(rdev
, NULL
, mddev
->minor_version
);
9261 pr_warn("%s: %d Could not reload rdev(%d) err: %d. Restoring old values\n",
9262 __func__
, __LINE__
, rdev
->desc_nr
, err
);
9264 put_page(rdev
->sb_page
);
9265 rdev
->sb_page
= swapout
;
9266 rdev
->sb_loaded
= 1;
9270 sb
= page_address(rdev
->sb_page
);
9271 /* Read the offset unconditionally, even if MD_FEATURE_RECOVERY_OFFSET
9275 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RECOVERY_OFFSET
))
9276 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
9278 /* The other node finished recovery, call spare_active to set
9279 * device In_sync and mddev->degraded
9281 if (rdev
->recovery_offset
== MaxSector
&&
9282 !test_bit(In_sync
, &rdev
->flags
) &&
9283 mddev
->pers
->spare_active(mddev
))
9284 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
9290 void md_reload_sb(struct mddev
*mddev
, int nr
)
9292 struct md_rdev
*rdev
;
9296 rdev_for_each_rcu(rdev
, mddev
) {
9297 if (rdev
->desc_nr
== nr
)
9301 if (!rdev
|| rdev
->desc_nr
!= nr
) {
9302 pr_warn("%s: %d Could not find rdev with nr %d\n", __func__
, __LINE__
, nr
);
9306 err
= read_rdev(mddev
, rdev
);
9310 check_sb_changes(mddev
, rdev
);
9312 /* Read all rdev's to update recovery_offset */
9313 rdev_for_each_rcu(rdev
, mddev
)
9314 read_rdev(mddev
, rdev
);
9316 EXPORT_SYMBOL(md_reload_sb
);
9321 * Searches all registered partitions for autorun RAID arrays
9325 static DEFINE_MUTEX(detected_devices_mutex
);
9326 static LIST_HEAD(all_detected_devices
);
9327 struct detected_devices_node
{
9328 struct list_head list
;
9332 void md_autodetect_dev(dev_t dev
)
9334 struct detected_devices_node
*node_detected_dev
;
9336 node_detected_dev
= kzalloc(sizeof(*node_detected_dev
), GFP_KERNEL
);
9337 if (node_detected_dev
) {
9338 node_detected_dev
->dev
= dev
;
9339 mutex_lock(&detected_devices_mutex
);
9340 list_add_tail(&node_detected_dev
->list
, &all_detected_devices
);
9341 mutex_unlock(&detected_devices_mutex
);
9345 static void autostart_arrays(int part
)
9347 struct md_rdev
*rdev
;
9348 struct detected_devices_node
*node_detected_dev
;
9350 int i_scanned
, i_passed
;
9355 pr_info("md: Autodetecting RAID arrays.\n");
9357 mutex_lock(&detected_devices_mutex
);
9358 while (!list_empty(&all_detected_devices
) && i_scanned
< INT_MAX
) {
9360 node_detected_dev
= list_entry(all_detected_devices
.next
,
9361 struct detected_devices_node
, list
);
9362 list_del(&node_detected_dev
->list
);
9363 dev
= node_detected_dev
->dev
;
9364 kfree(node_detected_dev
);
9365 mutex_unlock(&detected_devices_mutex
);
9366 rdev
= md_import_device(dev
,0, 90);
9367 mutex_lock(&detected_devices_mutex
);
9371 if (test_bit(Faulty
, &rdev
->flags
))
9374 set_bit(AutoDetected
, &rdev
->flags
);
9375 list_add(&rdev
->same_set
, &pending_raid_disks
);
9378 mutex_unlock(&detected_devices_mutex
);
9380 pr_debug("md: Scanned %d and added %d devices.\n", i_scanned
, i_passed
);
9382 autorun_devices(part
);
9385 #endif /* !MODULE */
9387 static __exit
void md_exit(void)
9389 struct mddev
*mddev
;
9390 struct list_head
*tmp
;
9393 blk_unregister_region(MKDEV(MD_MAJOR
,0), 512);
9394 blk_unregister_region(MKDEV(mdp_major
,0), 1U << MINORBITS
);
9396 unregister_blkdev(MD_MAJOR
,"md");
9397 unregister_blkdev(mdp_major
, "mdp");
9398 unregister_reboot_notifier(&md_notifier
);
9399 unregister_sysctl_table(raid_table_header
);
9401 /* We cannot unload the modules while some process is
9402 * waiting for us in select() or poll() - wake them up
9405 while (waitqueue_active(&md_event_waiters
)) {
9406 /* not safe to leave yet */
9407 wake_up(&md_event_waiters
);
9411 remove_proc_entry("mdstat", NULL
);
9413 for_each_mddev(mddev
, tmp
) {
9414 export_array(mddev
);
9416 mddev
->hold_active
= 0;
9418 * for_each_mddev() will call mddev_put() at the end of each
9419 * iteration. As the mddev is now fully clear, this will
9420 * schedule the mddev for destruction by a workqueue, and the
9421 * destroy_workqueue() below will wait for that to complete.
9424 destroy_workqueue(md_misc_wq
);
9425 destroy_workqueue(md_wq
);
9428 subsys_initcall(md_init
);
9429 module_exit(md_exit
)
9431 static int get_ro(char *buffer
, const struct kernel_param
*kp
)
9433 return sprintf(buffer
, "%d", start_readonly
);
9435 static int set_ro(const char *val
, const struct kernel_param
*kp
)
9437 return kstrtouint(val
, 10, (unsigned int *)&start_readonly
);
9440 module_param_call(start_ro
, set_ro
, get_ro
, NULL
, S_IRUSR
|S_IWUSR
);
9441 module_param(start_dirty_degraded
, int, S_IRUGO
|S_IWUSR
);
9442 module_param_call(new_array
, add_named_array
, NULL
, NULL
, S_IWUSR
);
9443 module_param(create_on_open
, bool, S_IRUSR
|S_IWUSR
);
9445 MODULE_LICENSE("GPL");
9446 MODULE_DESCRIPTION("MD RAID framework");
9448 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);