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/kthread.h>
48 #include <linux/blkdev.h>
49 #include <linux/badblocks.h>
50 #include <linux/sysctl.h>
51 #include <linux/seq_file.h>
53 #include <linux/poll.h>
54 #include <linux/ctype.h>
55 #include <linux/string.h>
56 #include <linux/hdreg.h>
57 #include <linux/proc_fs.h>
58 #include <linux/random.h>
59 #include <linux/module.h>
60 #include <linux/reboot.h>
61 #include <linux/file.h>
62 #include <linux/compat.h>
63 #include <linux/delay.h>
64 #include <linux/raid/md_p.h>
65 #include <linux/raid/md_u.h>
66 #include <linux/slab.h>
67 #include <trace/events/block.h>
70 #include "md-cluster.h"
73 static void autostart_arrays(int part
);
76 /* pers_list is a list of registered personalities protected
78 * pers_lock does extra service to protect accesses to
79 * mddev->thread when the mutex cannot be held.
81 static LIST_HEAD(pers_list
);
82 static DEFINE_SPINLOCK(pers_lock
);
84 struct md_cluster_operations
*md_cluster_ops
;
85 EXPORT_SYMBOL(md_cluster_ops
);
86 struct module
*md_cluster_mod
;
87 EXPORT_SYMBOL(md_cluster_mod
);
89 static DECLARE_WAIT_QUEUE_HEAD(resync_wait
);
90 static struct workqueue_struct
*md_wq
;
91 static struct workqueue_struct
*md_misc_wq
;
93 static int remove_and_add_spares(struct mddev
*mddev
,
94 struct md_rdev
*this);
95 static void mddev_detach(struct mddev
*mddev
);
98 * Default number of read corrections we'll attempt on an rdev
99 * before ejecting it from the array. We divide the read error
100 * count by 2 for every hour elapsed between read errors.
102 #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
104 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
105 * is 1000 KB/sec, so the extra system load does not show up that much.
106 * Increase it if you want to have more _guaranteed_ speed. Note that
107 * the RAID driver will use the maximum available bandwidth if the IO
108 * subsystem is idle. There is also an 'absolute maximum' reconstruction
109 * speed limit - in case reconstruction slows down your system despite
112 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
113 * or /sys/block/mdX/md/sync_speed_{min,max}
116 static int sysctl_speed_limit_min
= 1000;
117 static int sysctl_speed_limit_max
= 200000;
118 static inline int speed_min(struct mddev
*mddev
)
120 return mddev
->sync_speed_min
?
121 mddev
->sync_speed_min
: sysctl_speed_limit_min
;
124 static inline int speed_max(struct mddev
*mddev
)
126 return mddev
->sync_speed_max
?
127 mddev
->sync_speed_max
: sysctl_speed_limit_max
;
130 static struct ctl_table_header
*raid_table_header
;
132 static struct ctl_table raid_table
[] = {
134 .procname
= "speed_limit_min",
135 .data
= &sysctl_speed_limit_min
,
136 .maxlen
= sizeof(int),
137 .mode
= S_IRUGO
|S_IWUSR
,
138 .proc_handler
= proc_dointvec
,
141 .procname
= "speed_limit_max",
142 .data
= &sysctl_speed_limit_max
,
143 .maxlen
= sizeof(int),
144 .mode
= S_IRUGO
|S_IWUSR
,
145 .proc_handler
= proc_dointvec
,
150 static struct ctl_table raid_dir_table
[] = {
154 .mode
= S_IRUGO
|S_IXUGO
,
160 static struct ctl_table raid_root_table
[] = {
165 .child
= raid_dir_table
,
170 static const struct block_device_operations md_fops
;
172 static int start_readonly
;
175 * like bio_clone, but with a local bio set
178 struct bio
*bio_alloc_mddev(gfp_t gfp_mask
, int nr_iovecs
,
183 if (!mddev
|| !mddev
->bio_set
)
184 return bio_alloc(gfp_mask
, nr_iovecs
);
186 b
= bio_alloc_bioset(gfp_mask
, nr_iovecs
, mddev
->bio_set
);
191 EXPORT_SYMBOL_GPL(bio_alloc_mddev
);
194 * We have a system wide 'event count' that is incremented
195 * on any 'interesting' event, and readers of /proc/mdstat
196 * can use 'poll' or 'select' to find out when the event
200 * start array, stop array, error, add device, remove device,
201 * start build, activate spare
203 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters
);
204 static atomic_t md_event_count
;
205 void md_new_event(struct mddev
*mddev
)
207 atomic_inc(&md_event_count
);
208 wake_up(&md_event_waiters
);
210 EXPORT_SYMBOL_GPL(md_new_event
);
213 * Enables to iterate over all existing md arrays
214 * all_mddevs_lock protects this list.
216 static LIST_HEAD(all_mddevs
);
217 static DEFINE_SPINLOCK(all_mddevs_lock
);
220 * iterates through all used mddevs in the system.
221 * We take care to grab the all_mddevs_lock whenever navigating
222 * the list, and to always hold a refcount when unlocked.
223 * Any code which breaks out of this loop while own
224 * a reference to the current mddev and must mddev_put it.
226 #define for_each_mddev(_mddev,_tmp) \
228 for (({ spin_lock(&all_mddevs_lock); \
229 _tmp = all_mddevs.next; \
231 ({ if (_tmp != &all_mddevs) \
232 mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\
233 spin_unlock(&all_mddevs_lock); \
234 if (_mddev) mddev_put(_mddev); \
235 _mddev = list_entry(_tmp, struct mddev, all_mddevs); \
236 _tmp != &all_mddevs;}); \
237 ({ spin_lock(&all_mddevs_lock); \
238 _tmp = _tmp->next;}) \
241 /* Rather than calling directly into the personality make_request function,
242 * IO requests come here first so that we can check if the device is
243 * being suspended pending a reconfiguration.
244 * We hold a refcount over the call to ->make_request. By the time that
245 * call has finished, the bio has been linked into some internal structure
246 * and so is visible to ->quiesce(), so we don't need the refcount any more.
248 static blk_qc_t
md_make_request(struct request_queue
*q
, struct bio
*bio
)
250 const int rw
= bio_data_dir(bio
);
251 struct mddev
*mddev
= q
->queuedata
;
252 unsigned int sectors
;
255 blk_queue_split(q
, &bio
, q
->bio_split
);
257 if (mddev
== NULL
|| mddev
->pers
== NULL
) {
259 return BLK_QC_T_NONE
;
261 if (mddev
->ro
== 1 && unlikely(rw
== WRITE
)) {
262 if (bio_sectors(bio
) != 0)
263 bio
->bi_error
= -EROFS
;
265 return BLK_QC_T_NONE
;
267 smp_rmb(); /* Ensure implications of 'active' are visible */
269 if (mddev
->suspended
) {
272 prepare_to_wait(&mddev
->sb_wait
, &__wait
,
273 TASK_UNINTERRUPTIBLE
);
274 if (!mddev
->suspended
)
280 finish_wait(&mddev
->sb_wait
, &__wait
);
282 atomic_inc(&mddev
->active_io
);
286 * save the sectors now since our bio can
287 * go away inside make_request
289 sectors
= bio_sectors(bio
);
290 /* bio could be mergeable after passing to underlayer */
291 bio
->bi_opf
&= ~REQ_NOMERGE
;
292 mddev
->pers
->make_request(mddev
, bio
);
294 cpu
= part_stat_lock();
295 part_stat_inc(cpu
, &mddev
->gendisk
->part0
, ios
[rw
]);
296 part_stat_add(cpu
, &mddev
->gendisk
->part0
, sectors
[rw
], sectors
);
299 if (atomic_dec_and_test(&mddev
->active_io
) && mddev
->suspended
)
300 wake_up(&mddev
->sb_wait
);
302 return BLK_QC_T_NONE
;
305 /* mddev_suspend makes sure no new requests are submitted
306 * to the device, and that any requests that have been submitted
307 * are completely handled.
308 * Once mddev_detach() is called and completes, the module will be
311 void mddev_suspend(struct mddev
*mddev
)
313 WARN_ON_ONCE(mddev
->thread
&& current
== mddev
->thread
->tsk
);
314 if (mddev
->suspended
++)
317 wait_event(mddev
->sb_wait
, atomic_read(&mddev
->active_io
) == 0);
318 mddev
->pers
->quiesce(mddev
, 1);
320 del_timer_sync(&mddev
->safemode_timer
);
322 EXPORT_SYMBOL_GPL(mddev_suspend
);
324 void mddev_resume(struct mddev
*mddev
)
326 if (--mddev
->suspended
)
328 wake_up(&mddev
->sb_wait
);
329 mddev
->pers
->quiesce(mddev
, 0);
331 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
332 md_wakeup_thread(mddev
->thread
);
333 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
335 EXPORT_SYMBOL_GPL(mddev_resume
);
337 int mddev_congested(struct mddev
*mddev
, int bits
)
339 struct md_personality
*pers
= mddev
->pers
;
343 if (mddev
->suspended
)
345 else if (pers
&& pers
->congested
)
346 ret
= pers
->congested(mddev
, bits
);
350 EXPORT_SYMBOL_GPL(mddev_congested
);
351 static int md_congested(void *data
, int bits
)
353 struct mddev
*mddev
= data
;
354 return mddev_congested(mddev
, bits
);
358 * Generic flush handling for md
361 static void md_end_flush(struct bio
*bio
)
363 struct md_rdev
*rdev
= bio
->bi_private
;
364 struct mddev
*mddev
= rdev
->mddev
;
366 rdev_dec_pending(rdev
, mddev
);
368 if (atomic_dec_and_test(&mddev
->flush_pending
)) {
369 /* The pre-request flush has finished */
370 queue_work(md_wq
, &mddev
->flush_work
);
375 static void md_submit_flush_data(struct work_struct
*ws
);
377 static void submit_flushes(struct work_struct
*ws
)
379 struct mddev
*mddev
= container_of(ws
, struct mddev
, flush_work
);
380 struct md_rdev
*rdev
;
382 INIT_WORK(&mddev
->flush_work
, md_submit_flush_data
);
383 atomic_set(&mddev
->flush_pending
, 1);
385 rdev_for_each_rcu(rdev
, mddev
)
386 if (rdev
->raid_disk
>= 0 &&
387 !test_bit(Faulty
, &rdev
->flags
)) {
388 /* Take two references, one is dropped
389 * when request finishes, one after
390 * we reclaim rcu_read_lock
393 atomic_inc(&rdev
->nr_pending
);
394 atomic_inc(&rdev
->nr_pending
);
396 bi
= bio_alloc_mddev(GFP_NOIO
, 0, mddev
);
397 bi
->bi_end_io
= md_end_flush
;
398 bi
->bi_private
= rdev
;
399 bi
->bi_bdev
= rdev
->bdev
;
400 bi
->bi_opf
= REQ_OP_WRITE
| REQ_PREFLUSH
;
401 atomic_inc(&mddev
->flush_pending
);
404 rdev_dec_pending(rdev
, mddev
);
407 if (atomic_dec_and_test(&mddev
->flush_pending
))
408 queue_work(md_wq
, &mddev
->flush_work
);
411 static void md_submit_flush_data(struct work_struct
*ws
)
413 struct mddev
*mddev
= container_of(ws
, struct mddev
, flush_work
);
414 struct bio
*bio
= mddev
->flush_bio
;
416 if (bio
->bi_iter
.bi_size
== 0)
417 /* an empty barrier - all done */
420 bio
->bi_opf
&= ~REQ_PREFLUSH
;
421 mddev
->pers
->make_request(mddev
, bio
);
424 mddev
->flush_bio
= NULL
;
425 wake_up(&mddev
->sb_wait
);
428 void md_flush_request(struct mddev
*mddev
, struct bio
*bio
)
430 spin_lock_irq(&mddev
->lock
);
431 wait_event_lock_irq(mddev
->sb_wait
,
434 mddev
->flush_bio
= bio
;
435 spin_unlock_irq(&mddev
->lock
);
437 INIT_WORK(&mddev
->flush_work
, submit_flushes
);
438 queue_work(md_wq
, &mddev
->flush_work
);
440 EXPORT_SYMBOL(md_flush_request
);
442 void md_unplug(struct blk_plug_cb
*cb
, bool from_schedule
)
444 struct mddev
*mddev
= cb
->data
;
445 md_wakeup_thread(mddev
->thread
);
448 EXPORT_SYMBOL(md_unplug
);
450 static inline struct mddev
*mddev_get(struct mddev
*mddev
)
452 atomic_inc(&mddev
->active
);
456 static void mddev_delayed_delete(struct work_struct
*ws
);
458 static void mddev_put(struct mddev
*mddev
)
460 struct bio_set
*bs
= NULL
;
462 if (!atomic_dec_and_lock(&mddev
->active
, &all_mddevs_lock
))
464 if (!mddev
->raid_disks
&& list_empty(&mddev
->disks
) &&
465 mddev
->ctime
== 0 && !mddev
->hold_active
) {
466 /* Array is not configured at all, and not held active,
468 list_del_init(&mddev
->all_mddevs
);
470 mddev
->bio_set
= NULL
;
471 if (mddev
->gendisk
) {
472 /* We did a probe so need to clean up. Call
473 * queue_work inside the spinlock so that
474 * flush_workqueue() after mddev_find will
475 * succeed in waiting for the work to be done.
477 INIT_WORK(&mddev
->del_work
, mddev_delayed_delete
);
478 queue_work(md_misc_wq
, &mddev
->del_work
);
482 spin_unlock(&all_mddevs_lock
);
487 static void md_safemode_timeout(unsigned long data
);
489 void mddev_init(struct mddev
*mddev
)
491 mutex_init(&mddev
->open_mutex
);
492 mutex_init(&mddev
->reconfig_mutex
);
493 mutex_init(&mddev
->bitmap_info
.mutex
);
494 INIT_LIST_HEAD(&mddev
->disks
);
495 INIT_LIST_HEAD(&mddev
->all_mddevs
);
496 setup_timer(&mddev
->safemode_timer
, md_safemode_timeout
,
497 (unsigned long) mddev
);
498 atomic_set(&mddev
->active
, 1);
499 atomic_set(&mddev
->openers
, 0);
500 atomic_set(&mddev
->active_io
, 0);
501 spin_lock_init(&mddev
->lock
);
502 atomic_set(&mddev
->flush_pending
, 0);
503 init_waitqueue_head(&mddev
->sb_wait
);
504 init_waitqueue_head(&mddev
->recovery_wait
);
505 mddev
->reshape_position
= MaxSector
;
506 mddev
->reshape_backwards
= 0;
507 mddev
->last_sync_action
= "none";
508 mddev
->resync_min
= 0;
509 mddev
->resync_max
= MaxSector
;
510 mddev
->level
= LEVEL_NONE
;
512 EXPORT_SYMBOL_GPL(mddev_init
);
514 static struct mddev
*mddev_find(dev_t unit
)
516 struct mddev
*mddev
, *new = NULL
;
518 if (unit
&& MAJOR(unit
) != MD_MAJOR
)
519 unit
&= ~((1<<MdpMinorShift
)-1);
522 spin_lock(&all_mddevs_lock
);
525 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
526 if (mddev
->unit
== unit
) {
528 spin_unlock(&all_mddevs_lock
);
534 list_add(&new->all_mddevs
, &all_mddevs
);
535 spin_unlock(&all_mddevs_lock
);
536 new->hold_active
= UNTIL_IOCTL
;
540 /* find an unused unit number */
541 static int next_minor
= 512;
542 int start
= next_minor
;
546 dev
= MKDEV(MD_MAJOR
, next_minor
);
548 if (next_minor
> MINORMASK
)
550 if (next_minor
== start
) {
551 /* Oh dear, all in use. */
552 spin_unlock(&all_mddevs_lock
);
558 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
559 if (mddev
->unit
== dev
) {
565 new->md_minor
= MINOR(dev
);
566 new->hold_active
= UNTIL_STOP
;
567 list_add(&new->all_mddevs
, &all_mddevs
);
568 spin_unlock(&all_mddevs_lock
);
571 spin_unlock(&all_mddevs_lock
);
573 new = kzalloc(sizeof(*new), GFP_KERNEL
);
578 if (MAJOR(unit
) == MD_MAJOR
)
579 new->md_minor
= MINOR(unit
);
581 new->md_minor
= MINOR(unit
) >> MdpMinorShift
;
588 static struct attribute_group md_redundancy_group
;
590 void mddev_unlock(struct mddev
*mddev
)
592 if (mddev
->to_remove
) {
593 /* These cannot be removed under reconfig_mutex as
594 * an access to the files will try to take reconfig_mutex
595 * while holding the file unremovable, which leads to
597 * So hold set sysfs_active while the remove in happeing,
598 * and anything else which might set ->to_remove or my
599 * otherwise change the sysfs namespace will fail with
600 * -EBUSY if sysfs_active is still set.
601 * We set sysfs_active under reconfig_mutex and elsewhere
602 * test it under the same mutex to ensure its correct value
605 struct attribute_group
*to_remove
= mddev
->to_remove
;
606 mddev
->to_remove
= NULL
;
607 mddev
->sysfs_active
= 1;
608 mutex_unlock(&mddev
->reconfig_mutex
);
610 if (mddev
->kobj
.sd
) {
611 if (to_remove
!= &md_redundancy_group
)
612 sysfs_remove_group(&mddev
->kobj
, to_remove
);
613 if (mddev
->pers
== NULL
||
614 mddev
->pers
->sync_request
== NULL
) {
615 sysfs_remove_group(&mddev
->kobj
, &md_redundancy_group
);
616 if (mddev
->sysfs_action
)
617 sysfs_put(mddev
->sysfs_action
);
618 mddev
->sysfs_action
= NULL
;
621 mddev
->sysfs_active
= 0;
623 mutex_unlock(&mddev
->reconfig_mutex
);
625 /* As we've dropped the mutex we need a spinlock to
626 * make sure the thread doesn't disappear
628 spin_lock(&pers_lock
);
629 md_wakeup_thread(mddev
->thread
);
630 spin_unlock(&pers_lock
);
632 EXPORT_SYMBOL_GPL(mddev_unlock
);
634 struct md_rdev
*md_find_rdev_nr_rcu(struct mddev
*mddev
, int nr
)
636 struct md_rdev
*rdev
;
638 rdev_for_each_rcu(rdev
, mddev
)
639 if (rdev
->desc_nr
== nr
)
644 EXPORT_SYMBOL_GPL(md_find_rdev_nr_rcu
);
646 static struct md_rdev
*find_rdev(struct mddev
*mddev
, dev_t dev
)
648 struct md_rdev
*rdev
;
650 rdev_for_each(rdev
, mddev
)
651 if (rdev
->bdev
->bd_dev
== dev
)
657 static struct md_rdev
*find_rdev_rcu(struct mddev
*mddev
, dev_t dev
)
659 struct md_rdev
*rdev
;
661 rdev_for_each_rcu(rdev
, mddev
)
662 if (rdev
->bdev
->bd_dev
== dev
)
668 static struct md_personality
*find_pers(int level
, char *clevel
)
670 struct md_personality
*pers
;
671 list_for_each_entry(pers
, &pers_list
, list
) {
672 if (level
!= LEVEL_NONE
&& pers
->level
== level
)
674 if (strcmp(pers
->name
, clevel
)==0)
680 /* return the offset of the super block in 512byte sectors */
681 static inline sector_t
calc_dev_sboffset(struct md_rdev
*rdev
)
683 sector_t num_sectors
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
684 return MD_NEW_SIZE_SECTORS(num_sectors
);
687 static int alloc_disk_sb(struct md_rdev
*rdev
)
689 rdev
->sb_page
= alloc_page(GFP_KERNEL
);
695 void md_rdev_clear(struct md_rdev
*rdev
)
698 put_page(rdev
->sb_page
);
700 rdev
->sb_page
= NULL
;
705 put_page(rdev
->bb_page
);
706 rdev
->bb_page
= NULL
;
708 badblocks_exit(&rdev
->badblocks
);
710 EXPORT_SYMBOL_GPL(md_rdev_clear
);
712 static void super_written(struct bio
*bio
)
714 struct md_rdev
*rdev
= bio
->bi_private
;
715 struct mddev
*mddev
= rdev
->mddev
;
718 pr_err("md: super_written gets error=%d\n", bio
->bi_error
);
719 md_error(mddev
, rdev
);
720 if (!test_bit(Faulty
, &rdev
->flags
)
721 && (bio
->bi_opf
& MD_FAILFAST
)) {
722 set_bit(MD_SB_NEED_REWRITE
, &mddev
->sb_flags
);
723 set_bit(LastDev
, &rdev
->flags
);
726 clear_bit(LastDev
, &rdev
->flags
);
728 if (atomic_dec_and_test(&mddev
->pending_writes
))
729 wake_up(&mddev
->sb_wait
);
730 rdev_dec_pending(rdev
, mddev
);
734 void md_super_write(struct mddev
*mddev
, struct md_rdev
*rdev
,
735 sector_t sector
, int size
, struct page
*page
)
737 /* write first size bytes of page to sector of rdev
738 * Increment mddev->pending_writes before returning
739 * and decrement it on completion, waking up sb_wait
740 * if zero is reached.
741 * If an error occurred, call md_error
746 if (test_bit(Faulty
, &rdev
->flags
))
749 bio
= bio_alloc_mddev(GFP_NOIO
, 1, mddev
);
751 atomic_inc(&rdev
->nr_pending
);
753 bio
->bi_bdev
= rdev
->meta_bdev
? rdev
->meta_bdev
: rdev
->bdev
;
754 bio
->bi_iter
.bi_sector
= sector
;
755 bio_add_page(bio
, page
, size
, 0);
756 bio
->bi_private
= rdev
;
757 bio
->bi_end_io
= super_written
;
759 if (test_bit(MD_FAILFAST_SUPPORTED
, &mddev
->flags
) &&
760 test_bit(FailFast
, &rdev
->flags
) &&
761 !test_bit(LastDev
, &rdev
->flags
))
763 bio
->bi_opf
= REQ_OP_WRITE
| REQ_PREFLUSH
| REQ_FUA
| ff
;
765 atomic_inc(&mddev
->pending_writes
);
769 int md_super_wait(struct mddev
*mddev
)
771 /* wait for all superblock writes that were scheduled to complete */
772 wait_event(mddev
->sb_wait
, atomic_read(&mddev
->pending_writes
)==0);
773 if (test_and_clear_bit(MD_SB_NEED_REWRITE
, &mddev
->sb_flags
))
778 int sync_page_io(struct md_rdev
*rdev
, sector_t sector
, int size
,
779 struct page
*page
, int op
, int op_flags
, bool metadata_op
)
781 struct bio
*bio
= bio_alloc_mddev(GFP_NOIO
, 1, rdev
->mddev
);
784 bio
->bi_bdev
= (metadata_op
&& rdev
->meta_bdev
) ?
785 rdev
->meta_bdev
: rdev
->bdev
;
786 bio_set_op_attrs(bio
, op
, op_flags
);
788 bio
->bi_iter
.bi_sector
= sector
+ rdev
->sb_start
;
789 else if (rdev
->mddev
->reshape_position
!= MaxSector
&&
790 (rdev
->mddev
->reshape_backwards
==
791 (sector
>= rdev
->mddev
->reshape_position
)))
792 bio
->bi_iter
.bi_sector
= sector
+ rdev
->new_data_offset
;
794 bio
->bi_iter
.bi_sector
= sector
+ rdev
->data_offset
;
795 bio_add_page(bio
, page
, size
, 0);
797 submit_bio_wait(bio
);
799 ret
= !bio
->bi_error
;
803 EXPORT_SYMBOL_GPL(sync_page_io
);
805 static int read_disk_sb(struct md_rdev
*rdev
, int size
)
807 char b
[BDEVNAME_SIZE
];
812 if (!sync_page_io(rdev
, 0, size
, rdev
->sb_page
, REQ_OP_READ
, 0, true))
818 pr_err("md: disabled device %s, could not read superblock.\n",
819 bdevname(rdev
->bdev
,b
));
823 static int uuid_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
825 return sb1
->set_uuid0
== sb2
->set_uuid0
&&
826 sb1
->set_uuid1
== sb2
->set_uuid1
&&
827 sb1
->set_uuid2
== sb2
->set_uuid2
&&
828 sb1
->set_uuid3
== sb2
->set_uuid3
;
831 static int sb_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
834 mdp_super_t
*tmp1
, *tmp2
;
836 tmp1
= kmalloc(sizeof(*tmp1
),GFP_KERNEL
);
837 tmp2
= kmalloc(sizeof(*tmp2
),GFP_KERNEL
);
839 if (!tmp1
|| !tmp2
) {
848 * nr_disks is not constant
853 ret
= (memcmp(tmp1
, tmp2
, MD_SB_GENERIC_CONSTANT_WORDS
* 4) == 0);
860 static u32
md_csum_fold(u32 csum
)
862 csum
= (csum
& 0xffff) + (csum
>> 16);
863 return (csum
& 0xffff) + (csum
>> 16);
866 static unsigned int calc_sb_csum(mdp_super_t
*sb
)
869 u32
*sb32
= (u32
*)sb
;
871 unsigned int disk_csum
, csum
;
873 disk_csum
= sb
->sb_csum
;
876 for (i
= 0; i
< MD_SB_BYTES
/4 ; i
++)
878 csum
= (newcsum
& 0xffffffff) + (newcsum
>>32);
881 /* This used to use csum_partial, which was wrong for several
882 * reasons including that different results are returned on
883 * different architectures. It isn't critical that we get exactly
884 * the same return value as before (we always csum_fold before
885 * testing, and that removes any differences). However as we
886 * know that csum_partial always returned a 16bit value on
887 * alphas, do a fold to maximise conformity to previous behaviour.
889 sb
->sb_csum
= md_csum_fold(disk_csum
);
891 sb
->sb_csum
= disk_csum
;
897 * Handle superblock details.
898 * We want to be able to handle multiple superblock formats
899 * so we have a common interface to them all, and an array of
900 * different handlers.
901 * We rely on user-space to write the initial superblock, and support
902 * reading and updating of superblocks.
903 * Interface methods are:
904 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version)
905 * loads and validates a superblock on dev.
906 * if refdev != NULL, compare superblocks on both devices
908 * 0 - dev has a superblock that is compatible with refdev
909 * 1 - dev has a superblock that is compatible and newer than refdev
910 * so dev should be used as the refdev in future
911 * -EINVAL superblock incompatible or invalid
912 * -othererror e.g. -EIO
914 * int validate_super(struct mddev *mddev, struct md_rdev *dev)
915 * Verify that dev is acceptable into mddev.
916 * The first time, mddev->raid_disks will be 0, and data from
917 * dev should be merged in. Subsequent calls check that dev
918 * is new enough. Return 0 or -EINVAL
920 * void sync_super(struct mddev *mddev, struct md_rdev *dev)
921 * Update the superblock for rdev with data in mddev
922 * This does not write to disc.
928 struct module
*owner
;
929 int (*load_super
)(struct md_rdev
*rdev
,
930 struct md_rdev
*refdev
,
932 int (*validate_super
)(struct mddev
*mddev
,
933 struct md_rdev
*rdev
);
934 void (*sync_super
)(struct mddev
*mddev
,
935 struct md_rdev
*rdev
);
936 unsigned long long (*rdev_size_change
)(struct md_rdev
*rdev
,
937 sector_t num_sectors
);
938 int (*allow_new_offset
)(struct md_rdev
*rdev
,
939 unsigned long long new_offset
);
943 * Check that the given mddev has no bitmap.
945 * This function is called from the run method of all personalities that do not
946 * support bitmaps. It prints an error message and returns non-zero if mddev
947 * has a bitmap. Otherwise, it returns 0.
950 int md_check_no_bitmap(struct mddev
*mddev
)
952 if (!mddev
->bitmap_info
.file
&& !mddev
->bitmap_info
.offset
)
954 pr_warn("%s: bitmaps are not supported for %s\n",
955 mdname(mddev
), mddev
->pers
->name
);
958 EXPORT_SYMBOL(md_check_no_bitmap
);
961 * load_super for 0.90.0
963 static int super_90_load(struct md_rdev
*rdev
, struct md_rdev
*refdev
, int minor_version
)
965 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
970 * Calculate the position of the superblock (512byte sectors),
971 * it's at the end of the disk.
973 * It also happens to be a multiple of 4Kb.
975 rdev
->sb_start
= calc_dev_sboffset(rdev
);
977 ret
= read_disk_sb(rdev
, MD_SB_BYTES
);
983 bdevname(rdev
->bdev
, b
);
984 sb
= page_address(rdev
->sb_page
);
986 if (sb
->md_magic
!= MD_SB_MAGIC
) {
987 pr_warn("md: invalid raid superblock magic on %s\n", b
);
991 if (sb
->major_version
!= 0 ||
992 sb
->minor_version
< 90 ||
993 sb
->minor_version
> 91) {
994 pr_warn("Bad version number %d.%d on %s\n",
995 sb
->major_version
, sb
->minor_version
, b
);
999 if (sb
->raid_disks
<= 0)
1002 if (md_csum_fold(calc_sb_csum(sb
)) != md_csum_fold(sb
->sb_csum
)) {
1003 pr_warn("md: invalid superblock checksum on %s\n", b
);
1007 rdev
->preferred_minor
= sb
->md_minor
;
1008 rdev
->data_offset
= 0;
1009 rdev
->new_data_offset
= 0;
1010 rdev
->sb_size
= MD_SB_BYTES
;
1011 rdev
->badblocks
.shift
= -1;
1013 if (sb
->level
== LEVEL_MULTIPATH
)
1016 rdev
->desc_nr
= sb
->this_disk
.number
;
1022 mdp_super_t
*refsb
= page_address(refdev
->sb_page
);
1023 if (!uuid_equal(refsb
, sb
)) {
1024 pr_warn("md: %s has different UUID to %s\n",
1025 b
, bdevname(refdev
->bdev
,b2
));
1028 if (!sb_equal(refsb
, sb
)) {
1029 pr_warn("md: %s has same UUID but different superblock to %s\n",
1030 b
, bdevname(refdev
->bdev
, b2
));
1034 ev2
= md_event(refsb
);
1040 rdev
->sectors
= rdev
->sb_start
;
1041 /* Limit to 4TB as metadata cannot record more than that.
1042 * (not needed for Linear and RAID0 as metadata doesn't
1045 if (IS_ENABLED(CONFIG_LBDAF
) && (u64
)rdev
->sectors
>= (2ULL << 32) &&
1047 rdev
->sectors
= (sector_t
)(2ULL << 32) - 2;
1049 if (rdev
->sectors
< ((sector_t
)sb
->size
) * 2 && sb
->level
>= 1)
1050 /* "this cannot possibly happen" ... */
1058 * validate_super for 0.90.0
1060 static int super_90_validate(struct mddev
*mddev
, struct md_rdev
*rdev
)
1063 mdp_super_t
*sb
= page_address(rdev
->sb_page
);
1064 __u64 ev1
= md_event(sb
);
1066 rdev
->raid_disk
= -1;
1067 clear_bit(Faulty
, &rdev
->flags
);
1068 clear_bit(In_sync
, &rdev
->flags
);
1069 clear_bit(Bitmap_sync
, &rdev
->flags
);
1070 clear_bit(WriteMostly
, &rdev
->flags
);
1072 if (mddev
->raid_disks
== 0) {
1073 mddev
->major_version
= 0;
1074 mddev
->minor_version
= sb
->minor_version
;
1075 mddev
->patch_version
= sb
->patch_version
;
1076 mddev
->external
= 0;
1077 mddev
->chunk_sectors
= sb
->chunk_size
>> 9;
1078 mddev
->ctime
= sb
->ctime
;
1079 mddev
->utime
= sb
->utime
;
1080 mddev
->level
= sb
->level
;
1081 mddev
->clevel
[0] = 0;
1082 mddev
->layout
= sb
->layout
;
1083 mddev
->raid_disks
= sb
->raid_disks
;
1084 mddev
->dev_sectors
= ((sector_t
)sb
->size
) * 2;
1085 mddev
->events
= ev1
;
1086 mddev
->bitmap_info
.offset
= 0;
1087 mddev
->bitmap_info
.space
= 0;
1088 /* bitmap can use 60 K after the 4K superblocks */
1089 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
1090 mddev
->bitmap_info
.default_space
= 64*2 - (MD_SB_BYTES
>> 9);
1091 mddev
->reshape_backwards
= 0;
1093 if (mddev
->minor_version
>= 91) {
1094 mddev
->reshape_position
= sb
->reshape_position
;
1095 mddev
->delta_disks
= sb
->delta_disks
;
1096 mddev
->new_level
= sb
->new_level
;
1097 mddev
->new_layout
= sb
->new_layout
;
1098 mddev
->new_chunk_sectors
= sb
->new_chunk
>> 9;
1099 if (mddev
->delta_disks
< 0)
1100 mddev
->reshape_backwards
= 1;
1102 mddev
->reshape_position
= MaxSector
;
1103 mddev
->delta_disks
= 0;
1104 mddev
->new_level
= mddev
->level
;
1105 mddev
->new_layout
= mddev
->layout
;
1106 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1109 if (sb
->state
& (1<<MD_SB_CLEAN
))
1110 mddev
->recovery_cp
= MaxSector
;
1112 if (sb
->events_hi
== sb
->cp_events_hi
&&
1113 sb
->events_lo
== sb
->cp_events_lo
) {
1114 mddev
->recovery_cp
= sb
->recovery_cp
;
1116 mddev
->recovery_cp
= 0;
1119 memcpy(mddev
->uuid
+0, &sb
->set_uuid0
, 4);
1120 memcpy(mddev
->uuid
+4, &sb
->set_uuid1
, 4);
1121 memcpy(mddev
->uuid
+8, &sb
->set_uuid2
, 4);
1122 memcpy(mddev
->uuid
+12,&sb
->set_uuid3
, 4);
1124 mddev
->max_disks
= MD_SB_DISKS
;
1126 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
) &&
1127 mddev
->bitmap_info
.file
== NULL
) {
1128 mddev
->bitmap_info
.offset
=
1129 mddev
->bitmap_info
.default_offset
;
1130 mddev
->bitmap_info
.space
=
1131 mddev
->bitmap_info
.default_space
;
1134 } else if (mddev
->pers
== NULL
) {
1135 /* Insist on good event counter while assembling, except
1136 * for spares (which don't need an event count) */
1138 if (sb
->disks
[rdev
->desc_nr
].state
& (
1139 (1<<MD_DISK_SYNC
) | (1 << MD_DISK_ACTIVE
)))
1140 if (ev1
< mddev
->events
)
1142 } else if (mddev
->bitmap
) {
1143 /* if adding to array with a bitmap, then we can accept an
1144 * older device ... but not too old.
1146 if (ev1
< mddev
->bitmap
->events_cleared
)
1148 if (ev1
< mddev
->events
)
1149 set_bit(Bitmap_sync
, &rdev
->flags
);
1151 if (ev1
< mddev
->events
)
1152 /* just a hot-add of a new device, leave raid_disk at -1 */
1156 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1157 desc
= sb
->disks
+ rdev
->desc_nr
;
1159 if (desc
->state
& (1<<MD_DISK_FAULTY
))
1160 set_bit(Faulty
, &rdev
->flags
);
1161 else if (desc
->state
& (1<<MD_DISK_SYNC
) /* &&
1162 desc->raid_disk < mddev->raid_disks */) {
1163 set_bit(In_sync
, &rdev
->flags
);
1164 rdev
->raid_disk
= desc
->raid_disk
;
1165 rdev
->saved_raid_disk
= desc
->raid_disk
;
1166 } else if (desc
->state
& (1<<MD_DISK_ACTIVE
)) {
1167 /* active but not in sync implies recovery up to
1168 * reshape position. We don't know exactly where
1169 * that is, so set to zero for now */
1170 if (mddev
->minor_version
>= 91) {
1171 rdev
->recovery_offset
= 0;
1172 rdev
->raid_disk
= desc
->raid_disk
;
1175 if (desc
->state
& (1<<MD_DISK_WRITEMOSTLY
))
1176 set_bit(WriteMostly
, &rdev
->flags
);
1177 if (desc
->state
& (1<<MD_DISK_FAILFAST
))
1178 set_bit(FailFast
, &rdev
->flags
);
1179 } else /* MULTIPATH are always insync */
1180 set_bit(In_sync
, &rdev
->flags
);
1185 * sync_super for 0.90.0
1187 static void super_90_sync(struct mddev
*mddev
, struct md_rdev
*rdev
)
1190 struct md_rdev
*rdev2
;
1191 int next_spare
= mddev
->raid_disks
;
1193 /* make rdev->sb match mddev data..
1196 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1197 * 3/ any empty disks < next_spare become removed
1199 * disks[0] gets initialised to REMOVED because
1200 * we cannot be sure from other fields if it has
1201 * been initialised or not.
1204 int active
=0, working
=0,failed
=0,spare
=0,nr_disks
=0;
1206 rdev
->sb_size
= MD_SB_BYTES
;
1208 sb
= page_address(rdev
->sb_page
);
1210 memset(sb
, 0, sizeof(*sb
));
1212 sb
->md_magic
= MD_SB_MAGIC
;
1213 sb
->major_version
= mddev
->major_version
;
1214 sb
->patch_version
= mddev
->patch_version
;
1215 sb
->gvalid_words
= 0; /* ignored */
1216 memcpy(&sb
->set_uuid0
, mddev
->uuid
+0, 4);
1217 memcpy(&sb
->set_uuid1
, mddev
->uuid
+4, 4);
1218 memcpy(&sb
->set_uuid2
, mddev
->uuid
+8, 4);
1219 memcpy(&sb
->set_uuid3
, mddev
->uuid
+12,4);
1221 sb
->ctime
= clamp_t(time64_t
, mddev
->ctime
, 0, U32_MAX
);
1222 sb
->level
= mddev
->level
;
1223 sb
->size
= mddev
->dev_sectors
/ 2;
1224 sb
->raid_disks
= mddev
->raid_disks
;
1225 sb
->md_minor
= mddev
->md_minor
;
1226 sb
->not_persistent
= 0;
1227 sb
->utime
= clamp_t(time64_t
, mddev
->utime
, 0, U32_MAX
);
1229 sb
->events_hi
= (mddev
->events
>>32);
1230 sb
->events_lo
= (u32
)mddev
->events
;
1232 if (mddev
->reshape_position
== MaxSector
)
1233 sb
->minor_version
= 90;
1235 sb
->minor_version
= 91;
1236 sb
->reshape_position
= mddev
->reshape_position
;
1237 sb
->new_level
= mddev
->new_level
;
1238 sb
->delta_disks
= mddev
->delta_disks
;
1239 sb
->new_layout
= mddev
->new_layout
;
1240 sb
->new_chunk
= mddev
->new_chunk_sectors
<< 9;
1242 mddev
->minor_version
= sb
->minor_version
;
1245 sb
->recovery_cp
= mddev
->recovery_cp
;
1246 sb
->cp_events_hi
= (mddev
->events
>>32);
1247 sb
->cp_events_lo
= (u32
)mddev
->events
;
1248 if (mddev
->recovery_cp
== MaxSector
)
1249 sb
->state
= (1<< MD_SB_CLEAN
);
1251 sb
->recovery_cp
= 0;
1253 sb
->layout
= mddev
->layout
;
1254 sb
->chunk_size
= mddev
->chunk_sectors
<< 9;
1256 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
)
1257 sb
->state
|= (1<<MD_SB_BITMAP_PRESENT
);
1259 sb
->disks
[0].state
= (1<<MD_DISK_REMOVED
);
1260 rdev_for_each(rdev2
, mddev
) {
1263 int is_active
= test_bit(In_sync
, &rdev2
->flags
);
1265 if (rdev2
->raid_disk
>= 0 &&
1266 sb
->minor_version
>= 91)
1267 /* we have nowhere to store the recovery_offset,
1268 * but if it is not below the reshape_position,
1269 * we can piggy-back on that.
1272 if (rdev2
->raid_disk
< 0 ||
1273 test_bit(Faulty
, &rdev2
->flags
))
1276 desc_nr
= rdev2
->raid_disk
;
1278 desc_nr
= next_spare
++;
1279 rdev2
->desc_nr
= desc_nr
;
1280 d
= &sb
->disks
[rdev2
->desc_nr
];
1282 d
->number
= rdev2
->desc_nr
;
1283 d
->major
= MAJOR(rdev2
->bdev
->bd_dev
);
1284 d
->minor
= MINOR(rdev2
->bdev
->bd_dev
);
1286 d
->raid_disk
= rdev2
->raid_disk
;
1288 d
->raid_disk
= rdev2
->desc_nr
; /* compatibility */
1289 if (test_bit(Faulty
, &rdev2
->flags
))
1290 d
->state
= (1<<MD_DISK_FAULTY
);
1291 else if (is_active
) {
1292 d
->state
= (1<<MD_DISK_ACTIVE
);
1293 if (test_bit(In_sync
, &rdev2
->flags
))
1294 d
->state
|= (1<<MD_DISK_SYNC
);
1302 if (test_bit(WriteMostly
, &rdev2
->flags
))
1303 d
->state
|= (1<<MD_DISK_WRITEMOSTLY
);
1304 if (test_bit(FailFast
, &rdev2
->flags
))
1305 d
->state
|= (1<<MD_DISK_FAILFAST
);
1307 /* now set the "removed" and "faulty" bits on any missing devices */
1308 for (i
=0 ; i
< mddev
->raid_disks
; i
++) {
1309 mdp_disk_t
*d
= &sb
->disks
[i
];
1310 if (d
->state
== 0 && d
->number
== 0) {
1313 d
->state
= (1<<MD_DISK_REMOVED
);
1314 d
->state
|= (1<<MD_DISK_FAULTY
);
1318 sb
->nr_disks
= nr_disks
;
1319 sb
->active_disks
= active
;
1320 sb
->working_disks
= working
;
1321 sb
->failed_disks
= failed
;
1322 sb
->spare_disks
= spare
;
1324 sb
->this_disk
= sb
->disks
[rdev
->desc_nr
];
1325 sb
->sb_csum
= calc_sb_csum(sb
);
1329 * rdev_size_change for 0.90.0
1331 static unsigned long long
1332 super_90_rdev_size_change(struct md_rdev
*rdev
, sector_t num_sectors
)
1334 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1335 return 0; /* component must fit device */
1336 if (rdev
->mddev
->bitmap_info
.offset
)
1337 return 0; /* can't move bitmap */
1338 rdev
->sb_start
= calc_dev_sboffset(rdev
);
1339 if (!num_sectors
|| num_sectors
> rdev
->sb_start
)
1340 num_sectors
= rdev
->sb_start
;
1341 /* Limit to 4TB as metadata cannot record more than that.
1342 * 4TB == 2^32 KB, or 2*2^32 sectors.
1344 if (IS_ENABLED(CONFIG_LBDAF
) && (u64
)num_sectors
>= (2ULL << 32) &&
1345 rdev
->mddev
->level
>= 1)
1346 num_sectors
= (sector_t
)(2ULL << 32) - 2;
1348 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1350 } while (md_super_wait(rdev
->mddev
) < 0);
1355 super_90_allow_new_offset(struct md_rdev
*rdev
, unsigned long long new_offset
)
1357 /* non-zero offset changes not possible with v0.90 */
1358 return new_offset
== 0;
1362 * version 1 superblock
1365 static __le32
calc_sb_1_csum(struct mdp_superblock_1
*sb
)
1369 unsigned long long newcsum
;
1370 int size
= 256 + le32_to_cpu(sb
->max_dev
)*2;
1371 __le32
*isuper
= (__le32
*)sb
;
1373 disk_csum
= sb
->sb_csum
;
1376 for (; size
>= 4; size
-= 4)
1377 newcsum
+= le32_to_cpu(*isuper
++);
1380 newcsum
+= le16_to_cpu(*(__le16
*) isuper
);
1382 csum
= (newcsum
& 0xffffffff) + (newcsum
>> 32);
1383 sb
->sb_csum
= disk_csum
;
1384 return cpu_to_le32(csum
);
1387 static int super_1_load(struct md_rdev
*rdev
, struct md_rdev
*refdev
, int minor_version
)
1389 struct mdp_superblock_1
*sb
;
1393 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1397 * Calculate the position of the superblock in 512byte sectors.
1398 * It is always aligned to a 4K boundary and
1399 * depeding on minor_version, it can be:
1400 * 0: At least 8K, but less than 12K, from end of device
1401 * 1: At start of device
1402 * 2: 4K from start of device.
1404 switch(minor_version
) {
1406 sb_start
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1408 sb_start
&= ~(sector_t
)(4*2-1);
1419 rdev
->sb_start
= sb_start
;
1421 /* superblock is rarely larger than 1K, but it can be larger,
1422 * and it is safe to read 4k, so we do that
1424 ret
= read_disk_sb(rdev
, 4096);
1425 if (ret
) return ret
;
1427 sb
= page_address(rdev
->sb_page
);
1429 if (sb
->magic
!= cpu_to_le32(MD_SB_MAGIC
) ||
1430 sb
->major_version
!= cpu_to_le32(1) ||
1431 le32_to_cpu(sb
->max_dev
) > (4096-256)/2 ||
1432 le64_to_cpu(sb
->super_offset
) != rdev
->sb_start
||
1433 (le32_to_cpu(sb
->feature_map
) & ~MD_FEATURE_ALL
) != 0)
1436 if (calc_sb_1_csum(sb
) != sb
->sb_csum
) {
1437 pr_warn("md: invalid superblock checksum on %s\n",
1438 bdevname(rdev
->bdev
,b
));
1441 if (le64_to_cpu(sb
->data_size
) < 10) {
1442 pr_warn("md: data_size too small on %s\n",
1443 bdevname(rdev
->bdev
,b
));
1448 memcmp(sb
->pad3
, sb
->pad3
+1, sizeof(sb
->pad3
) - sizeof(sb
->pad3
[1])))
1449 /* Some padding is non-zero, might be a new feature */
1452 rdev
->preferred_minor
= 0xffff;
1453 rdev
->data_offset
= le64_to_cpu(sb
->data_offset
);
1454 rdev
->new_data_offset
= rdev
->data_offset
;
1455 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
) &&
1456 (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_NEW_OFFSET
))
1457 rdev
->new_data_offset
+= (s32
)le32_to_cpu(sb
->new_offset
);
1458 atomic_set(&rdev
->corrected_errors
, le32_to_cpu(sb
->cnt_corrected_read
));
1460 rdev
->sb_size
= le32_to_cpu(sb
->max_dev
) * 2 + 256;
1461 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1462 if (rdev
->sb_size
& bmask
)
1463 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1466 && rdev
->data_offset
< sb_start
+ (rdev
->sb_size
/512))
1469 && rdev
->new_data_offset
< sb_start
+ (rdev
->sb_size
/512))
1472 if (sb
->level
== cpu_to_le32(LEVEL_MULTIPATH
))
1475 rdev
->desc_nr
= le32_to_cpu(sb
->dev_number
);
1477 if (!rdev
->bb_page
) {
1478 rdev
->bb_page
= alloc_page(GFP_KERNEL
);
1482 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BAD_BLOCKS
) &&
1483 rdev
->badblocks
.count
== 0) {
1484 /* need to load the bad block list.
1485 * Currently we limit it to one page.
1491 int sectors
= le16_to_cpu(sb
->bblog_size
);
1492 if (sectors
> (PAGE_SIZE
/ 512))
1494 offset
= le32_to_cpu(sb
->bblog_offset
);
1497 bb_sector
= (long long)offset
;
1498 if (!sync_page_io(rdev
, bb_sector
, sectors
<< 9,
1499 rdev
->bb_page
, REQ_OP_READ
, 0, true))
1501 bbp
= (u64
*)page_address(rdev
->bb_page
);
1502 rdev
->badblocks
.shift
= sb
->bblog_shift
;
1503 for (i
= 0 ; i
< (sectors
<< (9-3)) ; i
++, bbp
++) {
1504 u64 bb
= le64_to_cpu(*bbp
);
1505 int count
= bb
& (0x3ff);
1506 u64 sector
= bb
>> 10;
1507 sector
<<= sb
->bblog_shift
;
1508 count
<<= sb
->bblog_shift
;
1511 if (badblocks_set(&rdev
->badblocks
, sector
, count
, 1))
1514 } else if (sb
->bblog_offset
!= 0)
1515 rdev
->badblocks
.shift
= 0;
1521 struct mdp_superblock_1
*refsb
= page_address(refdev
->sb_page
);
1523 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16) != 0 ||
1524 sb
->level
!= refsb
->level
||
1525 sb
->layout
!= refsb
->layout
||
1526 sb
->chunksize
!= refsb
->chunksize
) {
1527 pr_warn("md: %s has strangely different superblock to %s\n",
1528 bdevname(rdev
->bdev
,b
),
1529 bdevname(refdev
->bdev
,b2
));
1532 ev1
= le64_to_cpu(sb
->events
);
1533 ev2
= le64_to_cpu(refsb
->events
);
1540 if (minor_version
) {
1541 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9);
1542 sectors
-= rdev
->data_offset
;
1544 sectors
= rdev
->sb_start
;
1545 if (sectors
< le64_to_cpu(sb
->data_size
))
1547 rdev
->sectors
= le64_to_cpu(sb
->data_size
);
1551 static int super_1_validate(struct mddev
*mddev
, struct md_rdev
*rdev
)
1553 struct mdp_superblock_1
*sb
= page_address(rdev
->sb_page
);
1554 __u64 ev1
= le64_to_cpu(sb
->events
);
1556 rdev
->raid_disk
= -1;
1557 clear_bit(Faulty
, &rdev
->flags
);
1558 clear_bit(In_sync
, &rdev
->flags
);
1559 clear_bit(Bitmap_sync
, &rdev
->flags
);
1560 clear_bit(WriteMostly
, &rdev
->flags
);
1562 if (mddev
->raid_disks
== 0) {
1563 mddev
->major_version
= 1;
1564 mddev
->patch_version
= 0;
1565 mddev
->external
= 0;
1566 mddev
->chunk_sectors
= le32_to_cpu(sb
->chunksize
);
1567 mddev
->ctime
= le64_to_cpu(sb
->ctime
);
1568 mddev
->utime
= le64_to_cpu(sb
->utime
);
1569 mddev
->level
= le32_to_cpu(sb
->level
);
1570 mddev
->clevel
[0] = 0;
1571 mddev
->layout
= le32_to_cpu(sb
->layout
);
1572 mddev
->raid_disks
= le32_to_cpu(sb
->raid_disks
);
1573 mddev
->dev_sectors
= le64_to_cpu(sb
->size
);
1574 mddev
->events
= ev1
;
1575 mddev
->bitmap_info
.offset
= 0;
1576 mddev
->bitmap_info
.space
= 0;
1577 /* Default location for bitmap is 1K after superblock
1578 * using 3K - total of 4K
1580 mddev
->bitmap_info
.default_offset
= 1024 >> 9;
1581 mddev
->bitmap_info
.default_space
= (4096-1024) >> 9;
1582 mddev
->reshape_backwards
= 0;
1584 mddev
->recovery_cp
= le64_to_cpu(sb
->resync_offset
);
1585 memcpy(mddev
->uuid
, sb
->set_uuid
, 16);
1587 mddev
->max_disks
= (4096-256)/2;
1589 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
) &&
1590 mddev
->bitmap_info
.file
== NULL
) {
1591 mddev
->bitmap_info
.offset
=
1592 (__s32
)le32_to_cpu(sb
->bitmap_offset
);
1593 /* Metadata doesn't record how much space is available.
1594 * For 1.0, we assume we can use up to the superblock
1595 * if before, else to 4K beyond superblock.
1596 * For others, assume no change is possible.
1598 if (mddev
->minor_version
> 0)
1599 mddev
->bitmap_info
.space
= 0;
1600 else if (mddev
->bitmap_info
.offset
> 0)
1601 mddev
->bitmap_info
.space
=
1602 8 - mddev
->bitmap_info
.offset
;
1604 mddev
->bitmap_info
.space
=
1605 -mddev
->bitmap_info
.offset
;
1608 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
1609 mddev
->reshape_position
= le64_to_cpu(sb
->reshape_position
);
1610 mddev
->delta_disks
= le32_to_cpu(sb
->delta_disks
);
1611 mddev
->new_level
= le32_to_cpu(sb
->new_level
);
1612 mddev
->new_layout
= le32_to_cpu(sb
->new_layout
);
1613 mddev
->new_chunk_sectors
= le32_to_cpu(sb
->new_chunk
);
1614 if (mddev
->delta_disks
< 0 ||
1615 (mddev
->delta_disks
== 0 &&
1616 (le32_to_cpu(sb
->feature_map
)
1617 & MD_FEATURE_RESHAPE_BACKWARDS
)))
1618 mddev
->reshape_backwards
= 1;
1620 mddev
->reshape_position
= MaxSector
;
1621 mddev
->delta_disks
= 0;
1622 mddev
->new_level
= mddev
->level
;
1623 mddev
->new_layout
= mddev
->layout
;
1624 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1627 if (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_JOURNAL
)
1628 set_bit(MD_HAS_JOURNAL
, &mddev
->flags
);
1629 } else if (mddev
->pers
== NULL
) {
1630 /* Insist of good event counter while assembling, except for
1631 * spares (which don't need an event count) */
1633 if (rdev
->desc_nr
>= 0 &&
1634 rdev
->desc_nr
< le32_to_cpu(sb
->max_dev
) &&
1635 (le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]) < MD_DISK_ROLE_MAX
||
1636 le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]) == MD_DISK_ROLE_JOURNAL
))
1637 if (ev1
< mddev
->events
)
1639 } else if (mddev
->bitmap
) {
1640 /* If adding to array with a bitmap, then we can accept an
1641 * older device, but not too old.
1643 if (ev1
< mddev
->bitmap
->events_cleared
)
1645 if (ev1
< mddev
->events
)
1646 set_bit(Bitmap_sync
, &rdev
->flags
);
1648 if (ev1
< mddev
->events
)
1649 /* just a hot-add of a new device, leave raid_disk at -1 */
1652 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1654 if (rdev
->desc_nr
< 0 ||
1655 rdev
->desc_nr
>= le32_to_cpu(sb
->max_dev
)) {
1656 role
= MD_DISK_ROLE_SPARE
;
1659 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
1661 case MD_DISK_ROLE_SPARE
: /* spare */
1663 case MD_DISK_ROLE_FAULTY
: /* faulty */
1664 set_bit(Faulty
, &rdev
->flags
);
1666 case MD_DISK_ROLE_JOURNAL
: /* journal device */
1667 if (!(le32_to_cpu(sb
->feature_map
) & MD_FEATURE_JOURNAL
)) {
1668 /* journal device without journal feature */
1669 pr_warn("md: journal device provided without journal feature, ignoring the device\n");
1672 set_bit(Journal
, &rdev
->flags
);
1673 rdev
->journal_tail
= le64_to_cpu(sb
->journal_tail
);
1674 rdev
->raid_disk
= 0;
1677 rdev
->saved_raid_disk
= role
;
1678 if ((le32_to_cpu(sb
->feature_map
) &
1679 MD_FEATURE_RECOVERY_OFFSET
)) {
1680 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
1681 if (!(le32_to_cpu(sb
->feature_map
) &
1682 MD_FEATURE_RECOVERY_BITMAP
))
1683 rdev
->saved_raid_disk
= -1;
1685 set_bit(In_sync
, &rdev
->flags
);
1686 rdev
->raid_disk
= role
;
1689 if (sb
->devflags
& WriteMostly1
)
1690 set_bit(WriteMostly
, &rdev
->flags
);
1691 if (sb
->devflags
& FailFast1
)
1692 set_bit(FailFast
, &rdev
->flags
);
1693 if (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_REPLACEMENT
)
1694 set_bit(Replacement
, &rdev
->flags
);
1695 } else /* MULTIPATH are always insync */
1696 set_bit(In_sync
, &rdev
->flags
);
1701 static void super_1_sync(struct mddev
*mddev
, struct md_rdev
*rdev
)
1703 struct mdp_superblock_1
*sb
;
1704 struct md_rdev
*rdev2
;
1706 /* make rdev->sb match mddev and rdev data. */
1708 sb
= page_address(rdev
->sb_page
);
1710 sb
->feature_map
= 0;
1712 sb
->recovery_offset
= cpu_to_le64(0);
1713 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
1715 sb
->utime
= cpu_to_le64((__u64
)mddev
->utime
);
1716 sb
->events
= cpu_to_le64(mddev
->events
);
1718 sb
->resync_offset
= cpu_to_le64(mddev
->recovery_cp
);
1719 else if (test_bit(MD_JOURNAL_CLEAN
, &mddev
->flags
))
1720 sb
->resync_offset
= cpu_to_le64(MaxSector
);
1722 sb
->resync_offset
= cpu_to_le64(0);
1724 sb
->cnt_corrected_read
= cpu_to_le32(atomic_read(&rdev
->corrected_errors
));
1726 sb
->raid_disks
= cpu_to_le32(mddev
->raid_disks
);
1727 sb
->size
= cpu_to_le64(mddev
->dev_sectors
);
1728 sb
->chunksize
= cpu_to_le32(mddev
->chunk_sectors
);
1729 sb
->level
= cpu_to_le32(mddev
->level
);
1730 sb
->layout
= cpu_to_le32(mddev
->layout
);
1731 if (test_bit(FailFast
, &rdev
->flags
))
1732 sb
->devflags
|= FailFast1
;
1734 sb
->devflags
&= ~FailFast1
;
1736 if (test_bit(WriteMostly
, &rdev
->flags
))
1737 sb
->devflags
|= WriteMostly1
;
1739 sb
->devflags
&= ~WriteMostly1
;
1740 sb
->data_offset
= cpu_to_le64(rdev
->data_offset
);
1741 sb
->data_size
= cpu_to_le64(rdev
->sectors
);
1743 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
) {
1744 sb
->bitmap_offset
= cpu_to_le32((__u32
)mddev
->bitmap_info
.offset
);
1745 sb
->feature_map
= cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
);
1748 if (rdev
->raid_disk
>= 0 && !test_bit(Journal
, &rdev
->flags
) &&
1749 !test_bit(In_sync
, &rdev
->flags
)) {
1751 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET
);
1752 sb
->recovery_offset
=
1753 cpu_to_le64(rdev
->recovery_offset
);
1754 if (rdev
->saved_raid_disk
>= 0 && mddev
->bitmap
)
1756 cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP
);
1758 /* Note: recovery_offset and journal_tail share space */
1759 if (test_bit(Journal
, &rdev
->flags
))
1760 sb
->journal_tail
= cpu_to_le64(rdev
->journal_tail
);
1761 if (test_bit(Replacement
, &rdev
->flags
))
1763 cpu_to_le32(MD_FEATURE_REPLACEMENT
);
1765 if (mddev
->reshape_position
!= MaxSector
) {
1766 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE
);
1767 sb
->reshape_position
= cpu_to_le64(mddev
->reshape_position
);
1768 sb
->new_layout
= cpu_to_le32(mddev
->new_layout
);
1769 sb
->delta_disks
= cpu_to_le32(mddev
->delta_disks
);
1770 sb
->new_level
= cpu_to_le32(mddev
->new_level
);
1771 sb
->new_chunk
= cpu_to_le32(mddev
->new_chunk_sectors
);
1772 if (mddev
->delta_disks
== 0 &&
1773 mddev
->reshape_backwards
)
1775 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS
);
1776 if (rdev
->new_data_offset
!= rdev
->data_offset
) {
1778 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET
);
1779 sb
->new_offset
= cpu_to_le32((__u32
)(rdev
->new_data_offset
1780 - rdev
->data_offset
));
1784 if (mddev_is_clustered(mddev
))
1785 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_CLUSTERED
);
1787 if (rdev
->badblocks
.count
== 0)
1788 /* Nothing to do for bad blocks*/ ;
1789 else if (sb
->bblog_offset
== 0)
1790 /* Cannot record bad blocks on this device */
1791 md_error(mddev
, rdev
);
1793 struct badblocks
*bb
= &rdev
->badblocks
;
1794 u64
*bbp
= (u64
*)page_address(rdev
->bb_page
);
1796 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_BAD_BLOCKS
);
1801 seq
= read_seqbegin(&bb
->lock
);
1803 memset(bbp
, 0xff, PAGE_SIZE
);
1805 for (i
= 0 ; i
< bb
->count
; i
++) {
1806 u64 internal_bb
= p
[i
];
1807 u64 store_bb
= ((BB_OFFSET(internal_bb
) << 10)
1808 | BB_LEN(internal_bb
));
1809 bbp
[i
] = cpu_to_le64(store_bb
);
1812 if (read_seqretry(&bb
->lock
, seq
))
1815 bb
->sector
= (rdev
->sb_start
+
1816 (int)le32_to_cpu(sb
->bblog_offset
));
1817 bb
->size
= le16_to_cpu(sb
->bblog_size
);
1822 rdev_for_each(rdev2
, mddev
)
1823 if (rdev2
->desc_nr
+1 > max_dev
)
1824 max_dev
= rdev2
->desc_nr
+1;
1826 if (max_dev
> le32_to_cpu(sb
->max_dev
)) {
1828 sb
->max_dev
= cpu_to_le32(max_dev
);
1829 rdev
->sb_size
= max_dev
* 2 + 256;
1830 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1831 if (rdev
->sb_size
& bmask
)
1832 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1834 max_dev
= le32_to_cpu(sb
->max_dev
);
1836 for (i
=0; i
<max_dev
;i
++)
1837 sb
->dev_roles
[i
] = cpu_to_le16(MD_DISK_ROLE_FAULTY
);
1839 if (test_bit(MD_HAS_JOURNAL
, &mddev
->flags
))
1840 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_JOURNAL
);
1842 rdev_for_each(rdev2
, mddev
) {
1844 if (test_bit(Faulty
, &rdev2
->flags
))
1845 sb
->dev_roles
[i
] = cpu_to_le16(MD_DISK_ROLE_FAULTY
);
1846 else if (test_bit(In_sync
, &rdev2
->flags
))
1847 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1848 else if (test_bit(Journal
, &rdev2
->flags
))
1849 sb
->dev_roles
[i
] = cpu_to_le16(MD_DISK_ROLE_JOURNAL
);
1850 else if (rdev2
->raid_disk
>= 0)
1851 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1853 sb
->dev_roles
[i
] = cpu_to_le16(MD_DISK_ROLE_SPARE
);
1856 sb
->sb_csum
= calc_sb_1_csum(sb
);
1859 static unsigned long long
1860 super_1_rdev_size_change(struct md_rdev
*rdev
, sector_t num_sectors
)
1862 struct mdp_superblock_1
*sb
;
1863 sector_t max_sectors
;
1864 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1865 return 0; /* component must fit device */
1866 if (rdev
->data_offset
!= rdev
->new_data_offset
)
1867 return 0; /* too confusing */
1868 if (rdev
->sb_start
< rdev
->data_offset
) {
1869 /* minor versions 1 and 2; superblock before data */
1870 max_sectors
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1871 max_sectors
-= rdev
->data_offset
;
1872 if (!num_sectors
|| num_sectors
> max_sectors
)
1873 num_sectors
= max_sectors
;
1874 } else if (rdev
->mddev
->bitmap_info
.offset
) {
1875 /* minor version 0 with bitmap we can't move */
1878 /* minor version 0; superblock after data */
1880 sb_start
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) - 8*2;
1881 sb_start
&= ~(sector_t
)(4*2 - 1);
1882 max_sectors
= rdev
->sectors
+ sb_start
- rdev
->sb_start
;
1883 if (!num_sectors
|| num_sectors
> max_sectors
)
1884 num_sectors
= max_sectors
;
1885 rdev
->sb_start
= sb_start
;
1887 sb
= page_address(rdev
->sb_page
);
1888 sb
->data_size
= cpu_to_le64(num_sectors
);
1889 sb
->super_offset
= rdev
->sb_start
;
1890 sb
->sb_csum
= calc_sb_1_csum(sb
);
1892 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1894 } while (md_super_wait(rdev
->mddev
) < 0);
1900 super_1_allow_new_offset(struct md_rdev
*rdev
,
1901 unsigned long long new_offset
)
1903 /* All necessary checks on new >= old have been done */
1904 struct bitmap
*bitmap
;
1905 if (new_offset
>= rdev
->data_offset
)
1908 /* with 1.0 metadata, there is no metadata to tread on
1909 * so we can always move back */
1910 if (rdev
->mddev
->minor_version
== 0)
1913 /* otherwise we must be sure not to step on
1914 * any metadata, so stay:
1915 * 36K beyond start of superblock
1916 * beyond end of badblocks
1917 * beyond write-intent bitmap
1919 if (rdev
->sb_start
+ (32+4)*2 > new_offset
)
1921 bitmap
= rdev
->mddev
->bitmap
;
1922 if (bitmap
&& !rdev
->mddev
->bitmap_info
.file
&&
1923 rdev
->sb_start
+ rdev
->mddev
->bitmap_info
.offset
+
1924 bitmap
->storage
.file_pages
* (PAGE_SIZE
>>9) > new_offset
)
1926 if (rdev
->badblocks
.sector
+ rdev
->badblocks
.size
> new_offset
)
1932 static struct super_type super_types
[] = {
1935 .owner
= THIS_MODULE
,
1936 .load_super
= super_90_load
,
1937 .validate_super
= super_90_validate
,
1938 .sync_super
= super_90_sync
,
1939 .rdev_size_change
= super_90_rdev_size_change
,
1940 .allow_new_offset
= super_90_allow_new_offset
,
1944 .owner
= THIS_MODULE
,
1945 .load_super
= super_1_load
,
1946 .validate_super
= super_1_validate
,
1947 .sync_super
= super_1_sync
,
1948 .rdev_size_change
= super_1_rdev_size_change
,
1949 .allow_new_offset
= super_1_allow_new_offset
,
1953 static void sync_super(struct mddev
*mddev
, struct md_rdev
*rdev
)
1955 if (mddev
->sync_super
) {
1956 mddev
->sync_super(mddev
, rdev
);
1960 BUG_ON(mddev
->major_version
>= ARRAY_SIZE(super_types
));
1962 super_types
[mddev
->major_version
].sync_super(mddev
, rdev
);
1965 static int match_mddev_units(struct mddev
*mddev1
, struct mddev
*mddev2
)
1967 struct md_rdev
*rdev
, *rdev2
;
1970 rdev_for_each_rcu(rdev
, mddev1
) {
1971 if (test_bit(Faulty
, &rdev
->flags
) ||
1972 test_bit(Journal
, &rdev
->flags
) ||
1973 rdev
->raid_disk
== -1)
1975 rdev_for_each_rcu(rdev2
, mddev2
) {
1976 if (test_bit(Faulty
, &rdev2
->flags
) ||
1977 test_bit(Journal
, &rdev2
->flags
) ||
1978 rdev2
->raid_disk
== -1)
1980 if (rdev
->bdev
->bd_contains
==
1981 rdev2
->bdev
->bd_contains
) {
1991 static LIST_HEAD(pending_raid_disks
);
1994 * Try to register data integrity profile for an mddev
1996 * This is called when an array is started and after a disk has been kicked
1997 * from the array. It only succeeds if all working and active component devices
1998 * are integrity capable with matching profiles.
2000 int md_integrity_register(struct mddev
*mddev
)
2002 struct md_rdev
*rdev
, *reference
= NULL
;
2004 if (list_empty(&mddev
->disks
))
2005 return 0; /* nothing to do */
2006 if (!mddev
->gendisk
|| blk_get_integrity(mddev
->gendisk
))
2007 return 0; /* shouldn't register, or already is */
2008 rdev_for_each(rdev
, mddev
) {
2009 /* skip spares and non-functional disks */
2010 if (test_bit(Faulty
, &rdev
->flags
))
2012 if (rdev
->raid_disk
< 0)
2015 /* Use the first rdev as the reference */
2019 /* does this rdev's profile match the reference profile? */
2020 if (blk_integrity_compare(reference
->bdev
->bd_disk
,
2021 rdev
->bdev
->bd_disk
) < 0)
2024 if (!reference
|| !bdev_get_integrity(reference
->bdev
))
2027 * All component devices are integrity capable and have matching
2028 * profiles, register the common profile for the md device.
2030 blk_integrity_register(mddev
->gendisk
,
2031 bdev_get_integrity(reference
->bdev
));
2033 pr_debug("md: data integrity enabled on %s\n", mdname(mddev
));
2034 if (bioset_integrity_create(mddev
->bio_set
, BIO_POOL_SIZE
)) {
2035 pr_err("md: failed to create integrity pool for %s\n",
2041 EXPORT_SYMBOL(md_integrity_register
);
2044 * Attempt to add an rdev, but only if it is consistent with the current
2047 int md_integrity_add_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
2049 struct blk_integrity
*bi_rdev
;
2050 struct blk_integrity
*bi_mddev
;
2051 char name
[BDEVNAME_SIZE
];
2053 if (!mddev
->gendisk
)
2056 bi_rdev
= bdev_get_integrity(rdev
->bdev
);
2057 bi_mddev
= blk_get_integrity(mddev
->gendisk
);
2059 if (!bi_mddev
) /* nothing to do */
2062 if (blk_integrity_compare(mddev
->gendisk
, rdev
->bdev
->bd_disk
) != 0) {
2063 pr_err("%s: incompatible integrity profile for %s\n",
2064 mdname(mddev
), bdevname(rdev
->bdev
, name
));
2070 EXPORT_SYMBOL(md_integrity_add_rdev
);
2072 static int bind_rdev_to_array(struct md_rdev
*rdev
, struct mddev
*mddev
)
2074 char b
[BDEVNAME_SIZE
];
2078 /* prevent duplicates */
2079 if (find_rdev(mddev
, rdev
->bdev
->bd_dev
))
2082 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2083 if (!test_bit(Journal
, &rdev
->flags
) &&
2085 (mddev
->dev_sectors
== 0 || rdev
->sectors
< mddev
->dev_sectors
)) {
2087 /* Cannot change size, so fail
2088 * If mddev->level <= 0, then we don't care
2089 * about aligning sizes (e.g. linear)
2091 if (mddev
->level
> 0)
2094 mddev
->dev_sectors
= rdev
->sectors
;
2097 /* Verify rdev->desc_nr is unique.
2098 * If it is -1, assign a free number, else
2099 * check number is not in use
2102 if (rdev
->desc_nr
< 0) {
2105 choice
= mddev
->raid_disks
;
2106 while (md_find_rdev_nr_rcu(mddev
, choice
))
2108 rdev
->desc_nr
= choice
;
2110 if (md_find_rdev_nr_rcu(mddev
, rdev
->desc_nr
)) {
2116 if (!test_bit(Journal
, &rdev
->flags
) &&
2117 mddev
->max_disks
&& rdev
->desc_nr
>= mddev
->max_disks
) {
2118 pr_warn("md: %s: array is limited to %d devices\n",
2119 mdname(mddev
), mddev
->max_disks
);
2122 bdevname(rdev
->bdev
,b
);
2123 strreplace(b
, '/', '!');
2125 rdev
->mddev
= mddev
;
2126 pr_debug("md: bind<%s>\n", b
);
2128 if ((err
= kobject_add(&rdev
->kobj
, &mddev
->kobj
, "dev-%s", b
)))
2131 ko
= &part_to_dev(rdev
->bdev
->bd_part
)->kobj
;
2132 if (sysfs_create_link(&rdev
->kobj
, ko
, "block"))
2133 /* failure here is OK */;
2134 rdev
->sysfs_state
= sysfs_get_dirent_safe(rdev
->kobj
.sd
, "state");
2136 list_add_rcu(&rdev
->same_set
, &mddev
->disks
);
2137 bd_link_disk_holder(rdev
->bdev
, mddev
->gendisk
);
2139 /* May as well allow recovery to be retried once */
2140 mddev
->recovery_disabled
++;
2145 pr_warn("md: failed to register dev-%s for %s\n",
2150 static void md_delayed_delete(struct work_struct
*ws
)
2152 struct md_rdev
*rdev
= container_of(ws
, struct md_rdev
, del_work
);
2153 kobject_del(&rdev
->kobj
);
2154 kobject_put(&rdev
->kobj
);
2157 static void unbind_rdev_from_array(struct md_rdev
*rdev
)
2159 char b
[BDEVNAME_SIZE
];
2161 bd_unlink_disk_holder(rdev
->bdev
, rdev
->mddev
->gendisk
);
2162 list_del_rcu(&rdev
->same_set
);
2163 pr_debug("md: unbind<%s>\n", bdevname(rdev
->bdev
,b
));
2165 sysfs_remove_link(&rdev
->kobj
, "block");
2166 sysfs_put(rdev
->sysfs_state
);
2167 rdev
->sysfs_state
= NULL
;
2168 rdev
->badblocks
.count
= 0;
2169 /* We need to delay this, otherwise we can deadlock when
2170 * writing to 'remove' to "dev/state". We also need
2171 * to delay it due to rcu usage.
2174 INIT_WORK(&rdev
->del_work
, md_delayed_delete
);
2175 kobject_get(&rdev
->kobj
);
2176 queue_work(md_misc_wq
, &rdev
->del_work
);
2180 * prevent the device from being mounted, repartitioned or
2181 * otherwise reused by a RAID array (or any other kernel
2182 * subsystem), by bd_claiming the device.
2184 static int lock_rdev(struct md_rdev
*rdev
, dev_t dev
, int shared
)
2187 struct block_device
*bdev
;
2188 char b
[BDEVNAME_SIZE
];
2190 bdev
= blkdev_get_by_dev(dev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
,
2191 shared
? (struct md_rdev
*)lock_rdev
: rdev
);
2193 pr_warn("md: could not open %s.\n", __bdevname(dev
, b
));
2194 return PTR_ERR(bdev
);
2200 static void unlock_rdev(struct md_rdev
*rdev
)
2202 struct block_device
*bdev
= rdev
->bdev
;
2204 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
);
2207 void md_autodetect_dev(dev_t dev
);
2209 static void export_rdev(struct md_rdev
*rdev
)
2211 char b
[BDEVNAME_SIZE
];
2213 pr_debug("md: export_rdev(%s)\n", bdevname(rdev
->bdev
,b
));
2214 md_rdev_clear(rdev
);
2216 if (test_bit(AutoDetected
, &rdev
->flags
))
2217 md_autodetect_dev(rdev
->bdev
->bd_dev
);
2220 kobject_put(&rdev
->kobj
);
2223 void md_kick_rdev_from_array(struct md_rdev
*rdev
)
2225 unbind_rdev_from_array(rdev
);
2228 EXPORT_SYMBOL_GPL(md_kick_rdev_from_array
);
2230 static void export_array(struct mddev
*mddev
)
2232 struct md_rdev
*rdev
;
2234 while (!list_empty(&mddev
->disks
)) {
2235 rdev
= list_first_entry(&mddev
->disks
, struct md_rdev
,
2237 md_kick_rdev_from_array(rdev
);
2239 mddev
->raid_disks
= 0;
2240 mddev
->major_version
= 0;
2243 static void sync_sbs(struct mddev
*mddev
, int nospares
)
2245 /* Update each superblock (in-memory image), but
2246 * if we are allowed to, skip spares which already
2247 * have the right event counter, or have one earlier
2248 * (which would mean they aren't being marked as dirty
2249 * with the rest of the array)
2251 struct md_rdev
*rdev
;
2252 rdev_for_each(rdev
, mddev
) {
2253 if (rdev
->sb_events
== mddev
->events
||
2255 rdev
->raid_disk
< 0 &&
2256 rdev
->sb_events
+1 == mddev
->events
)) {
2257 /* Don't update this superblock */
2258 rdev
->sb_loaded
= 2;
2260 sync_super(mddev
, rdev
);
2261 rdev
->sb_loaded
= 1;
2266 static bool does_sb_need_changing(struct mddev
*mddev
)
2268 struct md_rdev
*rdev
;
2269 struct mdp_superblock_1
*sb
;
2272 /* Find a good rdev */
2273 rdev_for_each(rdev
, mddev
)
2274 if ((rdev
->raid_disk
>= 0) && !test_bit(Faulty
, &rdev
->flags
))
2277 /* No good device found. */
2281 sb
= page_address(rdev
->sb_page
);
2282 /* Check if a device has become faulty or a spare become active */
2283 rdev_for_each(rdev
, mddev
) {
2284 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
2285 /* Device activated? */
2286 if (role
== 0xffff && rdev
->raid_disk
>=0 &&
2287 !test_bit(Faulty
, &rdev
->flags
))
2289 /* Device turned faulty? */
2290 if (test_bit(Faulty
, &rdev
->flags
) && (role
< 0xfffd))
2294 /* Check if any mddev parameters have changed */
2295 if ((mddev
->dev_sectors
!= le64_to_cpu(sb
->size
)) ||
2296 (mddev
->reshape_position
!= le64_to_cpu(sb
->reshape_position
)) ||
2297 (mddev
->layout
!= le64_to_cpu(sb
->layout
)) ||
2298 (mddev
->raid_disks
!= le32_to_cpu(sb
->raid_disks
)) ||
2299 (mddev
->chunk_sectors
!= le32_to_cpu(sb
->chunksize
)))
2305 void md_update_sb(struct mddev
*mddev
, int force_change
)
2307 struct md_rdev
*rdev
;
2310 int any_badblocks_changed
= 0;
2315 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
2320 if (mddev_is_clustered(mddev
)) {
2321 if (test_and_clear_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
))
2323 if (test_and_clear_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
))
2325 ret
= md_cluster_ops
->metadata_update_start(mddev
);
2326 /* Has someone else has updated the sb */
2327 if (!does_sb_need_changing(mddev
)) {
2329 md_cluster_ops
->metadata_update_cancel(mddev
);
2330 bit_clear_unless(&mddev
->sb_flags
, BIT(MD_SB_CHANGE_PENDING
),
2331 BIT(MD_SB_CHANGE_DEVS
) |
2332 BIT(MD_SB_CHANGE_CLEAN
));
2337 /* First make sure individual recovery_offsets are correct */
2338 rdev_for_each(rdev
, mddev
) {
2339 if (rdev
->raid_disk
>= 0 &&
2340 mddev
->delta_disks
>= 0 &&
2341 !test_bit(Journal
, &rdev
->flags
) &&
2342 !test_bit(In_sync
, &rdev
->flags
) &&
2343 mddev
->curr_resync_completed
> rdev
->recovery_offset
)
2344 rdev
->recovery_offset
= mddev
->curr_resync_completed
;
2347 if (!mddev
->persistent
) {
2348 clear_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
2349 clear_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
2350 if (!mddev
->external
) {
2351 clear_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
2352 rdev_for_each(rdev
, mddev
) {
2353 if (rdev
->badblocks
.changed
) {
2354 rdev
->badblocks
.changed
= 0;
2355 ack_all_badblocks(&rdev
->badblocks
);
2356 md_error(mddev
, rdev
);
2358 clear_bit(Blocked
, &rdev
->flags
);
2359 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2360 wake_up(&rdev
->blocked_wait
);
2363 wake_up(&mddev
->sb_wait
);
2367 spin_lock(&mddev
->lock
);
2369 mddev
->utime
= ktime_get_real_seconds();
2371 if (test_and_clear_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
))
2373 if (test_and_clear_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
))
2374 /* just a clean<-> dirty transition, possibly leave spares alone,
2375 * though if events isn't the right even/odd, we will have to do
2381 if (mddev
->degraded
)
2382 /* If the array is degraded, then skipping spares is both
2383 * dangerous and fairly pointless.
2384 * Dangerous because a device that was removed from the array
2385 * might have a event_count that still looks up-to-date,
2386 * so it can be re-added without a resync.
2387 * Pointless because if there are any spares to skip,
2388 * then a recovery will happen and soon that array won't
2389 * be degraded any more and the spare can go back to sleep then.
2393 sync_req
= mddev
->in_sync
;
2395 /* If this is just a dirty<->clean transition, and the array is clean
2396 * and 'events' is odd, we can roll back to the previous clean state */
2398 && (mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
2399 && mddev
->can_decrease_events
2400 && mddev
->events
!= 1) {
2402 mddev
->can_decrease_events
= 0;
2404 /* otherwise we have to go forward and ... */
2406 mddev
->can_decrease_events
= nospares
;
2410 * This 64-bit counter should never wrap.
2411 * Either we are in around ~1 trillion A.C., assuming
2412 * 1 reboot per second, or we have a bug...
2414 WARN_ON(mddev
->events
== 0);
2416 rdev_for_each(rdev
, mddev
) {
2417 if (rdev
->badblocks
.changed
)
2418 any_badblocks_changed
++;
2419 if (test_bit(Faulty
, &rdev
->flags
))
2420 set_bit(FaultRecorded
, &rdev
->flags
);
2423 sync_sbs(mddev
, nospares
);
2424 spin_unlock(&mddev
->lock
);
2426 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2427 mdname(mddev
), mddev
->in_sync
);
2430 blk_add_trace_msg(mddev
->queue
, "md md_update_sb");
2432 bitmap_update_sb(mddev
->bitmap
);
2433 rdev_for_each(rdev
, mddev
) {
2434 char b
[BDEVNAME_SIZE
];
2436 if (rdev
->sb_loaded
!= 1)
2437 continue; /* no noise on spare devices */
2439 if (!test_bit(Faulty
, &rdev
->flags
)) {
2440 md_super_write(mddev
,rdev
,
2441 rdev
->sb_start
, rdev
->sb_size
,
2443 pr_debug("md: (write) %s's sb offset: %llu\n",
2444 bdevname(rdev
->bdev
, b
),
2445 (unsigned long long)rdev
->sb_start
);
2446 rdev
->sb_events
= mddev
->events
;
2447 if (rdev
->badblocks
.size
) {
2448 md_super_write(mddev
, rdev
,
2449 rdev
->badblocks
.sector
,
2450 rdev
->badblocks
.size
<< 9,
2452 rdev
->badblocks
.size
= 0;
2456 pr_debug("md: %s (skipping faulty)\n",
2457 bdevname(rdev
->bdev
, b
));
2459 if (mddev
->level
== LEVEL_MULTIPATH
)
2460 /* only need to write one superblock... */
2463 if (md_super_wait(mddev
) < 0)
2465 /* if there was a failure, MD_SB_CHANGE_DEVS was set, and we re-write super */
2467 if (mddev_is_clustered(mddev
) && ret
== 0)
2468 md_cluster_ops
->metadata_update_finish(mddev
);
2470 if (mddev
->in_sync
!= sync_req
||
2471 !bit_clear_unless(&mddev
->sb_flags
, BIT(MD_SB_CHANGE_PENDING
),
2472 BIT(MD_SB_CHANGE_DEVS
) | BIT(MD_SB_CHANGE_CLEAN
)))
2473 /* have to write it out again */
2475 wake_up(&mddev
->sb_wait
);
2476 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
2477 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
2479 rdev_for_each(rdev
, mddev
) {
2480 if (test_and_clear_bit(FaultRecorded
, &rdev
->flags
))
2481 clear_bit(Blocked
, &rdev
->flags
);
2483 if (any_badblocks_changed
)
2484 ack_all_badblocks(&rdev
->badblocks
);
2485 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2486 wake_up(&rdev
->blocked_wait
);
2489 EXPORT_SYMBOL(md_update_sb
);
2491 static int add_bound_rdev(struct md_rdev
*rdev
)
2493 struct mddev
*mddev
= rdev
->mddev
;
2495 bool add_journal
= test_bit(Journal
, &rdev
->flags
);
2497 if (!mddev
->pers
->hot_remove_disk
|| add_journal
) {
2498 /* If there is hot_add_disk but no hot_remove_disk
2499 * then added disks for geometry changes,
2500 * and should be added immediately.
2502 super_types
[mddev
->major_version
].
2503 validate_super(mddev
, rdev
);
2505 mddev_suspend(mddev
);
2506 err
= mddev
->pers
->hot_add_disk(mddev
, rdev
);
2508 mddev_resume(mddev
);
2510 md_kick_rdev_from_array(rdev
);
2514 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2516 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
2517 if (mddev
->degraded
)
2518 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
2519 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
2520 md_new_event(mddev
);
2521 md_wakeup_thread(mddev
->thread
);
2525 /* words written to sysfs files may, or may not, be \n terminated.
2526 * We want to accept with case. For this we use cmd_match.
2528 static int cmd_match(const char *cmd
, const char *str
)
2530 /* See if cmd, written into a sysfs file, matches
2531 * str. They must either be the same, or cmd can
2532 * have a trailing newline
2534 while (*cmd
&& *str
&& *cmd
== *str
) {
2545 struct rdev_sysfs_entry
{
2546 struct attribute attr
;
2547 ssize_t (*show
)(struct md_rdev
*, char *);
2548 ssize_t (*store
)(struct md_rdev
*, const char *, size_t);
2552 state_show(struct md_rdev
*rdev
, char *page
)
2556 unsigned long flags
= ACCESS_ONCE(rdev
->flags
);
2558 if (test_bit(Faulty
, &flags
) ||
2559 (!test_bit(ExternalBbl
, &flags
) &&
2560 rdev
->badblocks
.unacked_exist
))
2561 len
+= sprintf(page
+len
, "faulty%s", sep
);
2562 if (test_bit(In_sync
, &flags
))
2563 len
+= sprintf(page
+len
, "in_sync%s", sep
);
2564 if (test_bit(Journal
, &flags
))
2565 len
+= sprintf(page
+len
, "journal%s", sep
);
2566 if (test_bit(WriteMostly
, &flags
))
2567 len
+= sprintf(page
+len
, "write_mostly%s", sep
);
2568 if (test_bit(Blocked
, &flags
) ||
2569 (rdev
->badblocks
.unacked_exist
2570 && !test_bit(Faulty
, &flags
)))
2571 len
+= sprintf(page
+len
, "blocked%s", sep
);
2572 if (!test_bit(Faulty
, &flags
) &&
2573 !test_bit(Journal
, &flags
) &&
2574 !test_bit(In_sync
, &flags
))
2575 len
+= sprintf(page
+len
, "spare%s", sep
);
2576 if (test_bit(WriteErrorSeen
, &flags
))
2577 len
+= sprintf(page
+len
, "write_error%s", sep
);
2578 if (test_bit(WantReplacement
, &flags
))
2579 len
+= sprintf(page
+len
, "want_replacement%s", sep
);
2580 if (test_bit(Replacement
, &flags
))
2581 len
+= sprintf(page
+len
, "replacement%s", sep
);
2582 if (test_bit(ExternalBbl
, &flags
))
2583 len
+= sprintf(page
+len
, "external_bbl%s", sep
);
2584 if (test_bit(FailFast
, &flags
))
2585 len
+= sprintf(page
+len
, "failfast%s", sep
);
2590 return len
+sprintf(page
+len
, "\n");
2594 state_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2597 * faulty - simulates an error
2598 * remove - disconnects the device
2599 * writemostly - sets write_mostly
2600 * -writemostly - clears write_mostly
2601 * blocked - sets the Blocked flags
2602 * -blocked - clears the Blocked and possibly simulates an error
2603 * insync - sets Insync providing device isn't active
2604 * -insync - clear Insync for a device with a slot assigned,
2605 * so that it gets rebuilt based on bitmap
2606 * write_error - sets WriteErrorSeen
2607 * -write_error - clears WriteErrorSeen
2608 * {,-}failfast - set/clear FailFast
2611 if (cmd_match(buf
, "faulty") && rdev
->mddev
->pers
) {
2612 md_error(rdev
->mddev
, rdev
);
2613 if (test_bit(Faulty
, &rdev
->flags
))
2617 } else if (cmd_match(buf
, "remove")) {
2618 if (rdev
->mddev
->pers
) {
2619 clear_bit(Blocked
, &rdev
->flags
);
2620 remove_and_add_spares(rdev
->mddev
, rdev
);
2622 if (rdev
->raid_disk
>= 0)
2625 struct mddev
*mddev
= rdev
->mddev
;
2627 if (mddev_is_clustered(mddev
))
2628 err
= md_cluster_ops
->remove_disk(mddev
, rdev
);
2631 md_kick_rdev_from_array(rdev
);
2633 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
2634 md_wakeup_thread(mddev
->thread
);
2636 md_new_event(mddev
);
2639 } else if (cmd_match(buf
, "writemostly")) {
2640 set_bit(WriteMostly
, &rdev
->flags
);
2642 } else if (cmd_match(buf
, "-writemostly")) {
2643 clear_bit(WriteMostly
, &rdev
->flags
);
2645 } else if (cmd_match(buf
, "blocked")) {
2646 set_bit(Blocked
, &rdev
->flags
);
2648 } else if (cmd_match(buf
, "-blocked")) {
2649 if (!test_bit(Faulty
, &rdev
->flags
) &&
2650 !test_bit(ExternalBbl
, &rdev
->flags
) &&
2651 rdev
->badblocks
.unacked_exist
) {
2652 /* metadata handler doesn't understand badblocks,
2653 * so we need to fail the device
2655 md_error(rdev
->mddev
, rdev
);
2657 clear_bit(Blocked
, &rdev
->flags
);
2658 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2659 wake_up(&rdev
->blocked_wait
);
2660 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2661 md_wakeup_thread(rdev
->mddev
->thread
);
2664 } else if (cmd_match(buf
, "insync") && rdev
->raid_disk
== -1) {
2665 set_bit(In_sync
, &rdev
->flags
);
2667 } else if (cmd_match(buf
, "failfast")) {
2668 set_bit(FailFast
, &rdev
->flags
);
2670 } else if (cmd_match(buf
, "-failfast")) {
2671 clear_bit(FailFast
, &rdev
->flags
);
2673 } else if (cmd_match(buf
, "-insync") && rdev
->raid_disk
>= 0 &&
2674 !test_bit(Journal
, &rdev
->flags
)) {
2675 if (rdev
->mddev
->pers
== NULL
) {
2676 clear_bit(In_sync
, &rdev
->flags
);
2677 rdev
->saved_raid_disk
= rdev
->raid_disk
;
2678 rdev
->raid_disk
= -1;
2681 } else if (cmd_match(buf
, "write_error")) {
2682 set_bit(WriteErrorSeen
, &rdev
->flags
);
2684 } else if (cmd_match(buf
, "-write_error")) {
2685 clear_bit(WriteErrorSeen
, &rdev
->flags
);
2687 } else if (cmd_match(buf
, "want_replacement")) {
2688 /* Any non-spare device that is not a replacement can
2689 * become want_replacement at any time, but we then need to
2690 * check if recovery is needed.
2692 if (rdev
->raid_disk
>= 0 &&
2693 !test_bit(Journal
, &rdev
->flags
) &&
2694 !test_bit(Replacement
, &rdev
->flags
))
2695 set_bit(WantReplacement
, &rdev
->flags
);
2696 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2697 md_wakeup_thread(rdev
->mddev
->thread
);
2699 } else if (cmd_match(buf
, "-want_replacement")) {
2700 /* Clearing 'want_replacement' is always allowed.
2701 * Once replacements starts it is too late though.
2704 clear_bit(WantReplacement
, &rdev
->flags
);
2705 } else if (cmd_match(buf
, "replacement")) {
2706 /* Can only set a device as a replacement when array has not
2707 * yet been started. Once running, replacement is automatic
2708 * from spares, or by assigning 'slot'.
2710 if (rdev
->mddev
->pers
)
2713 set_bit(Replacement
, &rdev
->flags
);
2716 } else if (cmd_match(buf
, "-replacement")) {
2717 /* Similarly, can only clear Replacement before start */
2718 if (rdev
->mddev
->pers
)
2721 clear_bit(Replacement
, &rdev
->flags
);
2724 } else if (cmd_match(buf
, "re-add")) {
2725 if (test_bit(Faulty
, &rdev
->flags
) && (rdev
->raid_disk
== -1)) {
2726 /* clear_bit is performed _after_ all the devices
2727 * have their local Faulty bit cleared. If any writes
2728 * happen in the meantime in the local node, they
2729 * will land in the local bitmap, which will be synced
2730 * by this node eventually
2732 if (!mddev_is_clustered(rdev
->mddev
) ||
2733 (err
= md_cluster_ops
->gather_bitmaps(rdev
)) == 0) {
2734 clear_bit(Faulty
, &rdev
->flags
);
2735 err
= add_bound_rdev(rdev
);
2739 } else if (cmd_match(buf
, "external_bbl") && (rdev
->mddev
->external
)) {
2740 set_bit(ExternalBbl
, &rdev
->flags
);
2741 rdev
->badblocks
.shift
= 0;
2743 } else if (cmd_match(buf
, "-external_bbl") && (rdev
->mddev
->external
)) {
2744 clear_bit(ExternalBbl
, &rdev
->flags
);
2748 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2749 return err
? err
: len
;
2751 static struct rdev_sysfs_entry rdev_state
=
2752 __ATTR_PREALLOC(state
, S_IRUGO
|S_IWUSR
, state_show
, state_store
);
2755 errors_show(struct md_rdev
*rdev
, char *page
)
2757 return sprintf(page
, "%d\n", atomic_read(&rdev
->corrected_errors
));
2761 errors_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2766 rv
= kstrtouint(buf
, 10, &n
);
2769 atomic_set(&rdev
->corrected_errors
, n
);
2772 static struct rdev_sysfs_entry rdev_errors
=
2773 __ATTR(errors
, S_IRUGO
|S_IWUSR
, errors_show
, errors_store
);
2776 slot_show(struct md_rdev
*rdev
, char *page
)
2778 if (test_bit(Journal
, &rdev
->flags
))
2779 return sprintf(page
, "journal\n");
2780 else if (rdev
->raid_disk
< 0)
2781 return sprintf(page
, "none\n");
2783 return sprintf(page
, "%d\n", rdev
->raid_disk
);
2787 slot_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2792 if (test_bit(Journal
, &rdev
->flags
))
2794 if (strncmp(buf
, "none", 4)==0)
2797 err
= kstrtouint(buf
, 10, (unsigned int *)&slot
);
2801 if (rdev
->mddev
->pers
&& slot
== -1) {
2802 /* Setting 'slot' on an active array requires also
2803 * updating the 'rd%d' link, and communicating
2804 * with the personality with ->hot_*_disk.
2805 * For now we only support removing
2806 * failed/spare devices. This normally happens automatically,
2807 * but not when the metadata is externally managed.
2809 if (rdev
->raid_disk
== -1)
2811 /* personality does all needed checks */
2812 if (rdev
->mddev
->pers
->hot_remove_disk
== NULL
)
2814 clear_bit(Blocked
, &rdev
->flags
);
2815 remove_and_add_spares(rdev
->mddev
, rdev
);
2816 if (rdev
->raid_disk
>= 0)
2818 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2819 md_wakeup_thread(rdev
->mddev
->thread
);
2820 } else if (rdev
->mddev
->pers
) {
2821 /* Activating a spare .. or possibly reactivating
2822 * if we ever get bitmaps working here.
2826 if (rdev
->raid_disk
!= -1)
2829 if (test_bit(MD_RECOVERY_RUNNING
, &rdev
->mddev
->recovery
))
2832 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
2835 if (slot
>= rdev
->mddev
->raid_disks
&&
2836 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
2839 rdev
->raid_disk
= slot
;
2840 if (test_bit(In_sync
, &rdev
->flags
))
2841 rdev
->saved_raid_disk
= slot
;
2843 rdev
->saved_raid_disk
= -1;
2844 clear_bit(In_sync
, &rdev
->flags
);
2845 clear_bit(Bitmap_sync
, &rdev
->flags
);
2846 err
= rdev
->mddev
->pers
->
2847 hot_add_disk(rdev
->mddev
, rdev
);
2849 rdev
->raid_disk
= -1;
2852 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2853 if (sysfs_link_rdev(rdev
->mddev
, rdev
))
2854 /* failure here is OK */;
2855 /* don't wakeup anyone, leave that to userspace. */
2857 if (slot
>= rdev
->mddev
->raid_disks
&&
2858 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
2860 rdev
->raid_disk
= slot
;
2861 /* assume it is working */
2862 clear_bit(Faulty
, &rdev
->flags
);
2863 clear_bit(WriteMostly
, &rdev
->flags
);
2864 set_bit(In_sync
, &rdev
->flags
);
2865 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2870 static struct rdev_sysfs_entry rdev_slot
=
2871 __ATTR(slot
, S_IRUGO
|S_IWUSR
, slot_show
, slot_store
);
2874 offset_show(struct md_rdev
*rdev
, char *page
)
2876 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->data_offset
);
2880 offset_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2882 unsigned long long offset
;
2883 if (kstrtoull(buf
, 10, &offset
) < 0)
2885 if (rdev
->mddev
->pers
&& rdev
->raid_disk
>= 0)
2887 if (rdev
->sectors
&& rdev
->mddev
->external
)
2888 /* Must set offset before size, so overlap checks
2891 rdev
->data_offset
= offset
;
2892 rdev
->new_data_offset
= offset
;
2896 static struct rdev_sysfs_entry rdev_offset
=
2897 __ATTR(offset
, S_IRUGO
|S_IWUSR
, offset_show
, offset_store
);
2899 static ssize_t
new_offset_show(struct md_rdev
*rdev
, char *page
)
2901 return sprintf(page
, "%llu\n",
2902 (unsigned long long)rdev
->new_data_offset
);
2905 static ssize_t
new_offset_store(struct md_rdev
*rdev
,
2906 const char *buf
, size_t len
)
2908 unsigned long long new_offset
;
2909 struct mddev
*mddev
= rdev
->mddev
;
2911 if (kstrtoull(buf
, 10, &new_offset
) < 0)
2914 if (mddev
->sync_thread
||
2915 test_bit(MD_RECOVERY_RUNNING
,&mddev
->recovery
))
2917 if (new_offset
== rdev
->data_offset
)
2918 /* reset is always permitted */
2920 else if (new_offset
> rdev
->data_offset
) {
2921 /* must not push array size beyond rdev_sectors */
2922 if (new_offset
- rdev
->data_offset
2923 + mddev
->dev_sectors
> rdev
->sectors
)
2926 /* Metadata worries about other space details. */
2928 /* decreasing the offset is inconsistent with a backwards
2931 if (new_offset
< rdev
->data_offset
&&
2932 mddev
->reshape_backwards
)
2934 /* Increasing offset is inconsistent with forwards
2935 * reshape. reshape_direction should be set to
2936 * 'backwards' first.
2938 if (new_offset
> rdev
->data_offset
&&
2939 !mddev
->reshape_backwards
)
2942 if (mddev
->pers
&& mddev
->persistent
&&
2943 !super_types
[mddev
->major_version
]
2944 .allow_new_offset(rdev
, new_offset
))
2946 rdev
->new_data_offset
= new_offset
;
2947 if (new_offset
> rdev
->data_offset
)
2948 mddev
->reshape_backwards
= 1;
2949 else if (new_offset
< rdev
->data_offset
)
2950 mddev
->reshape_backwards
= 0;
2954 static struct rdev_sysfs_entry rdev_new_offset
=
2955 __ATTR(new_offset
, S_IRUGO
|S_IWUSR
, new_offset_show
, new_offset_store
);
2958 rdev_size_show(struct md_rdev
*rdev
, char *page
)
2960 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->sectors
/ 2);
2963 static int overlaps(sector_t s1
, sector_t l1
, sector_t s2
, sector_t l2
)
2965 /* check if two start/length pairs overlap */
2973 static int strict_blocks_to_sectors(const char *buf
, sector_t
*sectors
)
2975 unsigned long long blocks
;
2978 if (kstrtoull(buf
, 10, &blocks
) < 0)
2981 if (blocks
& 1ULL << (8 * sizeof(blocks
) - 1))
2982 return -EINVAL
; /* sector conversion overflow */
2985 if (new != blocks
* 2)
2986 return -EINVAL
; /* unsigned long long to sector_t overflow */
2993 rdev_size_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2995 struct mddev
*my_mddev
= rdev
->mddev
;
2996 sector_t oldsectors
= rdev
->sectors
;
2999 if (test_bit(Journal
, &rdev
->flags
))
3001 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
3003 if (rdev
->data_offset
!= rdev
->new_data_offset
)
3004 return -EINVAL
; /* too confusing */
3005 if (my_mddev
->pers
&& rdev
->raid_disk
>= 0) {
3006 if (my_mddev
->persistent
) {
3007 sectors
= super_types
[my_mddev
->major_version
].
3008 rdev_size_change(rdev
, sectors
);
3011 } else if (!sectors
)
3012 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) -
3014 if (!my_mddev
->pers
->resize
)
3015 /* Cannot change size for RAID0 or Linear etc */
3018 if (sectors
< my_mddev
->dev_sectors
)
3019 return -EINVAL
; /* component must fit device */
3021 rdev
->sectors
= sectors
;
3022 if (sectors
> oldsectors
&& my_mddev
->external
) {
3023 /* Need to check that all other rdevs with the same
3024 * ->bdev do not overlap. 'rcu' is sufficient to walk
3025 * the rdev lists safely.
3026 * This check does not provide a hard guarantee, it
3027 * just helps avoid dangerous mistakes.
3029 struct mddev
*mddev
;
3031 struct list_head
*tmp
;
3034 for_each_mddev(mddev
, tmp
) {
3035 struct md_rdev
*rdev2
;
3037 rdev_for_each(rdev2
, mddev
)
3038 if (rdev
->bdev
== rdev2
->bdev
&&
3040 overlaps(rdev
->data_offset
, rdev
->sectors
,
3053 /* Someone else could have slipped in a size
3054 * change here, but doing so is just silly.
3055 * We put oldsectors back because we *know* it is
3056 * safe, and trust userspace not to race with
3059 rdev
->sectors
= oldsectors
;
3066 static struct rdev_sysfs_entry rdev_size
=
3067 __ATTR(size
, S_IRUGO
|S_IWUSR
, rdev_size_show
, rdev_size_store
);
3069 static ssize_t
recovery_start_show(struct md_rdev
*rdev
, char *page
)
3071 unsigned long long recovery_start
= rdev
->recovery_offset
;
3073 if (test_bit(In_sync
, &rdev
->flags
) ||
3074 recovery_start
== MaxSector
)
3075 return sprintf(page
, "none\n");
3077 return sprintf(page
, "%llu\n", recovery_start
);
3080 static ssize_t
recovery_start_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3082 unsigned long long recovery_start
;
3084 if (cmd_match(buf
, "none"))
3085 recovery_start
= MaxSector
;
3086 else if (kstrtoull(buf
, 10, &recovery_start
))
3089 if (rdev
->mddev
->pers
&&
3090 rdev
->raid_disk
>= 0)
3093 rdev
->recovery_offset
= recovery_start
;
3094 if (recovery_start
== MaxSector
)
3095 set_bit(In_sync
, &rdev
->flags
);
3097 clear_bit(In_sync
, &rdev
->flags
);
3101 static struct rdev_sysfs_entry rdev_recovery_start
=
3102 __ATTR(recovery_start
, S_IRUGO
|S_IWUSR
, recovery_start_show
, recovery_start_store
);
3104 /* sysfs access to bad-blocks list.
3105 * We present two files.
3106 * 'bad-blocks' lists sector numbers and lengths of ranges that
3107 * are recorded as bad. The list is truncated to fit within
3108 * the one-page limit of sysfs.
3109 * Writing "sector length" to this file adds an acknowledged
3111 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
3112 * been acknowledged. Writing to this file adds bad blocks
3113 * without acknowledging them. This is largely for testing.
3115 static ssize_t
bb_show(struct md_rdev
*rdev
, char *page
)
3117 return badblocks_show(&rdev
->badblocks
, page
, 0);
3119 static ssize_t
bb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
3121 int rv
= badblocks_store(&rdev
->badblocks
, page
, len
, 0);
3122 /* Maybe that ack was all we needed */
3123 if (test_and_clear_bit(BlockedBadBlocks
, &rdev
->flags
))
3124 wake_up(&rdev
->blocked_wait
);
3127 static struct rdev_sysfs_entry rdev_bad_blocks
=
3128 __ATTR(bad_blocks
, S_IRUGO
|S_IWUSR
, bb_show
, bb_store
);
3130 static ssize_t
ubb_show(struct md_rdev
*rdev
, char *page
)
3132 return badblocks_show(&rdev
->badblocks
, page
, 1);
3134 static ssize_t
ubb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
3136 return badblocks_store(&rdev
->badblocks
, page
, len
, 1);
3138 static struct rdev_sysfs_entry rdev_unack_bad_blocks
=
3139 __ATTR(unacknowledged_bad_blocks
, S_IRUGO
|S_IWUSR
, ubb_show
, ubb_store
);
3141 static struct attribute
*rdev_default_attrs
[] = {
3146 &rdev_new_offset
.attr
,
3148 &rdev_recovery_start
.attr
,
3149 &rdev_bad_blocks
.attr
,
3150 &rdev_unack_bad_blocks
.attr
,
3154 rdev_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
3156 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
3157 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
3163 return entry
->show(rdev
, page
);
3167 rdev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
3168 const char *page
, size_t length
)
3170 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
3171 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
3173 struct mddev
*mddev
= rdev
->mddev
;
3177 if (!capable(CAP_SYS_ADMIN
))
3179 rv
= mddev
? mddev_lock(mddev
): -EBUSY
;
3181 if (rdev
->mddev
== NULL
)
3184 rv
= entry
->store(rdev
, page
, length
);
3185 mddev_unlock(mddev
);
3190 static void rdev_free(struct kobject
*ko
)
3192 struct md_rdev
*rdev
= container_of(ko
, struct md_rdev
, kobj
);
3195 static const struct sysfs_ops rdev_sysfs_ops
= {
3196 .show
= rdev_attr_show
,
3197 .store
= rdev_attr_store
,
3199 static struct kobj_type rdev_ktype
= {
3200 .release
= rdev_free
,
3201 .sysfs_ops
= &rdev_sysfs_ops
,
3202 .default_attrs
= rdev_default_attrs
,
3205 int md_rdev_init(struct md_rdev
*rdev
)
3208 rdev
->saved_raid_disk
= -1;
3209 rdev
->raid_disk
= -1;
3211 rdev
->data_offset
= 0;
3212 rdev
->new_data_offset
= 0;
3213 rdev
->sb_events
= 0;
3214 rdev
->last_read_error
= 0;
3215 rdev
->sb_loaded
= 0;
3216 rdev
->bb_page
= NULL
;
3217 atomic_set(&rdev
->nr_pending
, 0);
3218 atomic_set(&rdev
->read_errors
, 0);
3219 atomic_set(&rdev
->corrected_errors
, 0);
3221 INIT_LIST_HEAD(&rdev
->same_set
);
3222 init_waitqueue_head(&rdev
->blocked_wait
);
3224 /* Add space to store bad block list.
3225 * This reserves the space even on arrays where it cannot
3226 * be used - I wonder if that matters
3228 return badblocks_init(&rdev
->badblocks
, 0);
3230 EXPORT_SYMBOL_GPL(md_rdev_init
);
3232 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3234 * mark the device faulty if:
3236 * - the device is nonexistent (zero size)
3237 * - the device has no valid superblock
3239 * a faulty rdev _never_ has rdev->sb set.
3241 static struct md_rdev
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
3243 char b
[BDEVNAME_SIZE
];
3245 struct md_rdev
*rdev
;
3248 rdev
= kzalloc(sizeof(*rdev
), GFP_KERNEL
);
3250 return ERR_PTR(-ENOMEM
);
3252 err
= md_rdev_init(rdev
);
3255 err
= alloc_disk_sb(rdev
);
3259 err
= lock_rdev(rdev
, newdev
, super_format
== -2);
3263 kobject_init(&rdev
->kobj
, &rdev_ktype
);
3265 size
= i_size_read(rdev
->bdev
->bd_inode
) >> BLOCK_SIZE_BITS
;
3267 pr_warn("md: %s has zero or unknown size, marking faulty!\n",
3268 bdevname(rdev
->bdev
,b
));
3273 if (super_format
>= 0) {
3274 err
= super_types
[super_format
].
3275 load_super(rdev
, NULL
, super_minor
);
3276 if (err
== -EINVAL
) {
3277 pr_warn("md: %s does not have a valid v%d.%d superblock, not importing!\n",
3278 bdevname(rdev
->bdev
,b
),
3279 super_format
, super_minor
);
3283 pr_warn("md: could not read %s's sb, not importing!\n",
3284 bdevname(rdev
->bdev
,b
));
3294 md_rdev_clear(rdev
);
3296 return ERR_PTR(err
);
3300 * Check a full RAID array for plausibility
3303 static void analyze_sbs(struct mddev
*mddev
)
3306 struct md_rdev
*rdev
, *freshest
, *tmp
;
3307 char b
[BDEVNAME_SIZE
];
3310 rdev_for_each_safe(rdev
, tmp
, mddev
)
3311 switch (super_types
[mddev
->major_version
].
3312 load_super(rdev
, freshest
, mddev
->minor_version
)) {
3319 pr_warn("md: fatal superblock inconsistency in %s -- removing from array\n",
3320 bdevname(rdev
->bdev
,b
));
3321 md_kick_rdev_from_array(rdev
);
3324 super_types
[mddev
->major_version
].
3325 validate_super(mddev
, freshest
);
3328 rdev_for_each_safe(rdev
, tmp
, mddev
) {
3329 if (mddev
->max_disks
&&
3330 (rdev
->desc_nr
>= mddev
->max_disks
||
3331 i
> mddev
->max_disks
)) {
3332 pr_warn("md: %s: %s: only %d devices permitted\n",
3333 mdname(mddev
), bdevname(rdev
->bdev
, b
),
3335 md_kick_rdev_from_array(rdev
);
3338 if (rdev
!= freshest
) {
3339 if (super_types
[mddev
->major_version
].
3340 validate_super(mddev
, rdev
)) {
3341 pr_warn("md: kicking non-fresh %s from array!\n",
3342 bdevname(rdev
->bdev
,b
));
3343 md_kick_rdev_from_array(rdev
);
3347 if (mddev
->level
== LEVEL_MULTIPATH
) {
3348 rdev
->desc_nr
= i
++;
3349 rdev
->raid_disk
= rdev
->desc_nr
;
3350 set_bit(In_sync
, &rdev
->flags
);
3351 } else if (rdev
->raid_disk
>=
3352 (mddev
->raid_disks
- min(0, mddev
->delta_disks
)) &&
3353 !test_bit(Journal
, &rdev
->flags
)) {
3354 rdev
->raid_disk
= -1;
3355 clear_bit(In_sync
, &rdev
->flags
);
3360 /* Read a fixed-point number.
3361 * Numbers in sysfs attributes should be in "standard" units where
3362 * possible, so time should be in seconds.
3363 * However we internally use a a much smaller unit such as
3364 * milliseconds or jiffies.
3365 * This function takes a decimal number with a possible fractional
3366 * component, and produces an integer which is the result of
3367 * multiplying that number by 10^'scale'.
3368 * all without any floating-point arithmetic.
3370 int strict_strtoul_scaled(const char *cp
, unsigned long *res
, int scale
)
3372 unsigned long result
= 0;
3374 while (isdigit(*cp
) || (*cp
== '.' && decimals
< 0)) {
3377 else if (decimals
< scale
) {
3380 result
= result
* 10 + value
;
3392 while (decimals
< scale
) {
3401 safe_delay_show(struct mddev
*mddev
, char *page
)
3403 int msec
= (mddev
->safemode_delay
*1000)/HZ
;
3404 return sprintf(page
, "%d.%03d\n", msec
/1000, msec
%1000);
3407 safe_delay_store(struct mddev
*mddev
, const char *cbuf
, size_t len
)
3411 if (mddev_is_clustered(mddev
)) {
3412 pr_warn("md: Safemode is disabled for clustered mode\n");
3416 if (strict_strtoul_scaled(cbuf
, &msec
, 3) < 0)
3419 mddev
->safemode_delay
= 0;
3421 unsigned long old_delay
= mddev
->safemode_delay
;
3422 unsigned long new_delay
= (msec
*HZ
)/1000;
3426 mddev
->safemode_delay
= new_delay
;
3427 if (new_delay
< old_delay
|| old_delay
== 0)
3428 mod_timer(&mddev
->safemode_timer
, jiffies
+1);
3432 static struct md_sysfs_entry md_safe_delay
=
3433 __ATTR(safe_mode_delay
, S_IRUGO
|S_IWUSR
,safe_delay_show
, safe_delay_store
);
3436 level_show(struct mddev
*mddev
, char *page
)
3438 struct md_personality
*p
;
3440 spin_lock(&mddev
->lock
);
3443 ret
= sprintf(page
, "%s\n", p
->name
);
3444 else if (mddev
->clevel
[0])
3445 ret
= sprintf(page
, "%s\n", mddev
->clevel
);
3446 else if (mddev
->level
!= LEVEL_NONE
)
3447 ret
= sprintf(page
, "%d\n", mddev
->level
);
3450 spin_unlock(&mddev
->lock
);
3455 level_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3460 struct md_personality
*pers
, *oldpers
;
3462 void *priv
, *oldpriv
;
3463 struct md_rdev
*rdev
;
3465 if (slen
== 0 || slen
>= sizeof(clevel
))
3468 rv
= mddev_lock(mddev
);
3472 if (mddev
->pers
== NULL
) {
3473 strncpy(mddev
->clevel
, buf
, slen
);
3474 if (mddev
->clevel
[slen
-1] == '\n')
3476 mddev
->clevel
[slen
] = 0;
3477 mddev
->level
= LEVEL_NONE
;
3485 /* request to change the personality. Need to ensure:
3486 * - array is not engaged in resync/recovery/reshape
3487 * - old personality can be suspended
3488 * - new personality will access other array.
3492 if (mddev
->sync_thread
||
3493 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
3494 mddev
->reshape_position
!= MaxSector
||
3495 mddev
->sysfs_active
)
3499 if (!mddev
->pers
->quiesce
) {
3500 pr_warn("md: %s: %s does not support online personality change\n",
3501 mdname(mddev
), mddev
->pers
->name
);
3505 /* Now find the new personality */
3506 strncpy(clevel
, buf
, slen
);
3507 if (clevel
[slen
-1] == '\n')
3510 if (kstrtol(clevel
, 10, &level
))
3513 if (request_module("md-%s", clevel
) != 0)
3514 request_module("md-level-%s", clevel
);
3515 spin_lock(&pers_lock
);
3516 pers
= find_pers(level
, clevel
);
3517 if (!pers
|| !try_module_get(pers
->owner
)) {
3518 spin_unlock(&pers_lock
);
3519 pr_warn("md: personality %s not loaded\n", clevel
);
3523 spin_unlock(&pers_lock
);
3525 if (pers
== mddev
->pers
) {
3526 /* Nothing to do! */
3527 module_put(pers
->owner
);
3531 if (!pers
->takeover
) {
3532 module_put(pers
->owner
);
3533 pr_warn("md: %s: %s does not support personality takeover\n",
3534 mdname(mddev
), clevel
);
3539 rdev_for_each(rdev
, mddev
)
3540 rdev
->new_raid_disk
= rdev
->raid_disk
;
3542 /* ->takeover must set new_* and/or delta_disks
3543 * if it succeeds, and may set them when it fails.
3545 priv
= pers
->takeover(mddev
);
3547 mddev
->new_level
= mddev
->level
;
3548 mddev
->new_layout
= mddev
->layout
;
3549 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3550 mddev
->raid_disks
-= mddev
->delta_disks
;
3551 mddev
->delta_disks
= 0;
3552 mddev
->reshape_backwards
= 0;
3553 module_put(pers
->owner
);
3554 pr_warn("md: %s: %s would not accept array\n",
3555 mdname(mddev
), clevel
);
3560 /* Looks like we have a winner */
3561 mddev_suspend(mddev
);
3562 mddev_detach(mddev
);
3564 spin_lock(&mddev
->lock
);
3565 oldpers
= mddev
->pers
;
3566 oldpriv
= mddev
->private;
3568 mddev
->private = priv
;
3569 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
3570 mddev
->level
= mddev
->new_level
;
3571 mddev
->layout
= mddev
->new_layout
;
3572 mddev
->chunk_sectors
= mddev
->new_chunk_sectors
;
3573 mddev
->delta_disks
= 0;
3574 mddev
->reshape_backwards
= 0;
3575 mddev
->degraded
= 0;
3576 spin_unlock(&mddev
->lock
);
3578 if (oldpers
->sync_request
== NULL
&&
3580 /* We are converting from a no-redundancy array
3581 * to a redundancy array and metadata is managed
3582 * externally so we need to be sure that writes
3583 * won't block due to a need to transition
3585 * until external management is started.
3588 mddev
->safemode_delay
= 0;
3589 mddev
->safemode
= 0;
3592 oldpers
->free(mddev
, oldpriv
);
3594 if (oldpers
->sync_request
== NULL
&&
3595 pers
->sync_request
!= NULL
) {
3596 /* need to add the md_redundancy_group */
3597 if (sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
3598 pr_warn("md: cannot register extra attributes for %s\n",
3600 mddev
->sysfs_action
= sysfs_get_dirent(mddev
->kobj
.sd
, "sync_action");
3602 if (oldpers
->sync_request
!= NULL
&&
3603 pers
->sync_request
== NULL
) {
3604 /* need to remove the md_redundancy_group */
3605 if (mddev
->to_remove
== NULL
)
3606 mddev
->to_remove
= &md_redundancy_group
;
3609 module_put(oldpers
->owner
);
3611 rdev_for_each(rdev
, mddev
) {
3612 if (rdev
->raid_disk
< 0)
3614 if (rdev
->new_raid_disk
>= mddev
->raid_disks
)
3615 rdev
->new_raid_disk
= -1;
3616 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3618 sysfs_unlink_rdev(mddev
, rdev
);
3620 rdev_for_each(rdev
, mddev
) {
3621 if (rdev
->raid_disk
< 0)
3623 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3625 rdev
->raid_disk
= rdev
->new_raid_disk
;
3626 if (rdev
->raid_disk
< 0)
3627 clear_bit(In_sync
, &rdev
->flags
);
3629 if (sysfs_link_rdev(mddev
, rdev
))
3630 pr_warn("md: cannot register rd%d for %s after level change\n",
3631 rdev
->raid_disk
, mdname(mddev
));
3635 if (pers
->sync_request
== NULL
) {
3636 /* this is now an array without redundancy, so
3637 * it must always be in_sync
3640 del_timer_sync(&mddev
->safemode_timer
);
3642 blk_set_stacking_limits(&mddev
->queue
->limits
);
3644 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
3645 mddev_resume(mddev
);
3647 md_update_sb(mddev
, 1);
3648 sysfs_notify(&mddev
->kobj
, NULL
, "level");
3649 md_new_event(mddev
);
3652 mddev_unlock(mddev
);
3656 static struct md_sysfs_entry md_level
=
3657 __ATTR(level
, S_IRUGO
|S_IWUSR
, level_show
, level_store
);
3660 layout_show(struct mddev
*mddev
, char *page
)
3662 /* just a number, not meaningful for all levels */
3663 if (mddev
->reshape_position
!= MaxSector
&&
3664 mddev
->layout
!= mddev
->new_layout
)
3665 return sprintf(page
, "%d (%d)\n",
3666 mddev
->new_layout
, mddev
->layout
);
3667 return sprintf(page
, "%d\n", mddev
->layout
);
3671 layout_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3676 err
= kstrtouint(buf
, 10, &n
);
3679 err
= mddev_lock(mddev
);
3684 if (mddev
->pers
->check_reshape
== NULL
)
3689 mddev
->new_layout
= n
;
3690 err
= mddev
->pers
->check_reshape(mddev
);
3692 mddev
->new_layout
= mddev
->layout
;
3695 mddev
->new_layout
= n
;
3696 if (mddev
->reshape_position
== MaxSector
)
3699 mddev_unlock(mddev
);
3702 static struct md_sysfs_entry md_layout
=
3703 __ATTR(layout
, S_IRUGO
|S_IWUSR
, layout_show
, layout_store
);
3706 raid_disks_show(struct mddev
*mddev
, char *page
)
3708 if (mddev
->raid_disks
== 0)
3710 if (mddev
->reshape_position
!= MaxSector
&&
3711 mddev
->delta_disks
!= 0)
3712 return sprintf(page
, "%d (%d)\n", mddev
->raid_disks
,
3713 mddev
->raid_disks
- mddev
->delta_disks
);
3714 return sprintf(page
, "%d\n", mddev
->raid_disks
);
3717 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
);
3720 raid_disks_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3725 err
= kstrtouint(buf
, 10, &n
);
3729 err
= mddev_lock(mddev
);
3733 err
= update_raid_disks(mddev
, n
);
3734 else if (mddev
->reshape_position
!= MaxSector
) {
3735 struct md_rdev
*rdev
;
3736 int olddisks
= mddev
->raid_disks
- mddev
->delta_disks
;
3739 rdev_for_each(rdev
, mddev
) {
3741 rdev
->data_offset
< rdev
->new_data_offset
)
3744 rdev
->data_offset
> rdev
->new_data_offset
)
3748 mddev
->delta_disks
= n
- olddisks
;
3749 mddev
->raid_disks
= n
;
3750 mddev
->reshape_backwards
= (mddev
->delta_disks
< 0);
3752 mddev
->raid_disks
= n
;
3754 mddev_unlock(mddev
);
3755 return err
? err
: len
;
3757 static struct md_sysfs_entry md_raid_disks
=
3758 __ATTR(raid_disks
, S_IRUGO
|S_IWUSR
, raid_disks_show
, raid_disks_store
);
3761 chunk_size_show(struct mddev
*mddev
, char *page
)
3763 if (mddev
->reshape_position
!= MaxSector
&&
3764 mddev
->chunk_sectors
!= mddev
->new_chunk_sectors
)
3765 return sprintf(page
, "%d (%d)\n",
3766 mddev
->new_chunk_sectors
<< 9,
3767 mddev
->chunk_sectors
<< 9);
3768 return sprintf(page
, "%d\n", mddev
->chunk_sectors
<< 9);
3772 chunk_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3777 err
= kstrtoul(buf
, 10, &n
);
3781 err
= mddev_lock(mddev
);
3785 if (mddev
->pers
->check_reshape
== NULL
)
3790 mddev
->new_chunk_sectors
= n
>> 9;
3791 err
= mddev
->pers
->check_reshape(mddev
);
3793 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3796 mddev
->new_chunk_sectors
= n
>> 9;
3797 if (mddev
->reshape_position
== MaxSector
)
3798 mddev
->chunk_sectors
= n
>> 9;
3800 mddev_unlock(mddev
);
3803 static struct md_sysfs_entry md_chunk_size
=
3804 __ATTR(chunk_size
, S_IRUGO
|S_IWUSR
, chunk_size_show
, chunk_size_store
);
3807 resync_start_show(struct mddev
*mddev
, char *page
)
3809 if (mddev
->recovery_cp
== MaxSector
)
3810 return sprintf(page
, "none\n");
3811 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->recovery_cp
);
3815 resync_start_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3817 unsigned long long n
;
3820 if (cmd_match(buf
, "none"))
3823 err
= kstrtoull(buf
, 10, &n
);
3826 if (n
!= (sector_t
)n
)
3830 err
= mddev_lock(mddev
);
3833 if (mddev
->pers
&& !test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
3837 mddev
->recovery_cp
= n
;
3839 set_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
3841 mddev_unlock(mddev
);
3844 static struct md_sysfs_entry md_resync_start
=
3845 __ATTR_PREALLOC(resync_start
, S_IRUGO
|S_IWUSR
,
3846 resync_start_show
, resync_start_store
);
3849 * The array state can be:
3852 * No devices, no size, no level
3853 * Equivalent to STOP_ARRAY ioctl
3855 * May have some settings, but array is not active
3856 * all IO results in error
3857 * When written, doesn't tear down array, but just stops it
3858 * suspended (not supported yet)
3859 * All IO requests will block. The array can be reconfigured.
3860 * Writing this, if accepted, will block until array is quiescent
3862 * no resync can happen. no superblocks get written.
3863 * write requests fail
3865 * like readonly, but behaves like 'clean' on a write request.
3867 * clean - no pending writes, but otherwise active.
3868 * When written to inactive array, starts without resync
3869 * If a write request arrives then
3870 * if metadata is known, mark 'dirty' and switch to 'active'.
3871 * if not known, block and switch to write-pending
3872 * If written to an active array that has pending writes, then fails.
3874 * fully active: IO and resync can be happening.
3875 * When written to inactive array, starts with resync
3878 * clean, but writes are blocked waiting for 'active' to be written.
3881 * like active, but no writes have been seen for a while (100msec).
3884 enum array_state
{ clear
, inactive
, suspended
, readonly
, read_auto
, clean
, active
,
3885 write_pending
, active_idle
, bad_word
};
3886 static char *array_states
[] = {
3887 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3888 "write-pending", "active-idle", NULL
};
3890 static int match_word(const char *word
, char **list
)
3893 for (n
=0; list
[n
]; n
++)
3894 if (cmd_match(word
, list
[n
]))
3900 array_state_show(struct mddev
*mddev
, char *page
)
3902 enum array_state st
= inactive
;
3913 if (test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
))
3915 else if (mddev
->in_sync
)
3917 else if (mddev
->safemode
)
3923 if (list_empty(&mddev
->disks
) &&
3924 mddev
->raid_disks
== 0 &&
3925 mddev
->dev_sectors
== 0)
3930 return sprintf(page
, "%s\n", array_states
[st
]);
3933 static int do_md_stop(struct mddev
*mddev
, int ro
, struct block_device
*bdev
);
3934 static int md_set_readonly(struct mddev
*mddev
, struct block_device
*bdev
);
3935 static int do_md_run(struct mddev
*mddev
);
3936 static int restart_array(struct mddev
*mddev
);
3939 array_state_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3942 enum array_state st
= match_word(buf
, array_states
);
3944 if (mddev
->pers
&& (st
== active
|| st
== clean
) && mddev
->ro
!= 1) {
3945 /* don't take reconfig_mutex when toggling between
3948 spin_lock(&mddev
->lock
);
3950 restart_array(mddev
);
3951 clear_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
3952 md_wakeup_thread(mddev
->thread
);
3953 wake_up(&mddev
->sb_wait
);
3955 } else /* st == clean */ {
3956 restart_array(mddev
);
3957 if (atomic_read(&mddev
->writes_pending
) == 0) {
3958 if (mddev
->in_sync
== 0) {
3960 if (mddev
->safemode
== 1)
3961 mddev
->safemode
= 0;
3962 set_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
3969 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
3970 spin_unlock(&mddev
->lock
);
3973 err
= mddev_lock(mddev
);
3981 /* stopping an active array */
3982 err
= do_md_stop(mddev
, 0, NULL
);
3985 /* stopping an active array */
3987 err
= do_md_stop(mddev
, 2, NULL
);
3989 err
= 0; /* already inactive */
3992 break; /* not supported yet */
3995 err
= md_set_readonly(mddev
, NULL
);
3998 set_disk_ro(mddev
->gendisk
, 1);
3999 err
= do_md_run(mddev
);
4005 err
= md_set_readonly(mddev
, NULL
);
4006 else if (mddev
->ro
== 1)
4007 err
= restart_array(mddev
);
4010 set_disk_ro(mddev
->gendisk
, 0);
4014 err
= do_md_run(mddev
);
4019 err
= restart_array(mddev
);
4022 spin_lock(&mddev
->lock
);
4023 if (atomic_read(&mddev
->writes_pending
) == 0) {
4024 if (mddev
->in_sync
== 0) {
4026 if (mddev
->safemode
== 1)
4027 mddev
->safemode
= 0;
4028 set_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
4033 spin_unlock(&mddev
->lock
);
4039 err
= restart_array(mddev
);
4042 clear_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
4043 wake_up(&mddev
->sb_wait
);
4047 set_disk_ro(mddev
->gendisk
, 0);
4048 err
= do_md_run(mddev
);
4053 /* these cannot be set */
4058 if (mddev
->hold_active
== UNTIL_IOCTL
)
4059 mddev
->hold_active
= 0;
4060 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4062 mddev_unlock(mddev
);
4065 static struct md_sysfs_entry md_array_state
=
4066 __ATTR_PREALLOC(array_state
, S_IRUGO
|S_IWUSR
, array_state_show
, array_state_store
);
4069 max_corrected_read_errors_show(struct mddev
*mddev
, char *page
) {
4070 return sprintf(page
, "%d\n",
4071 atomic_read(&mddev
->max_corr_read_errors
));
4075 max_corrected_read_errors_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4080 rv
= kstrtouint(buf
, 10, &n
);
4083 atomic_set(&mddev
->max_corr_read_errors
, n
);
4087 static struct md_sysfs_entry max_corr_read_errors
=
4088 __ATTR(max_read_errors
, S_IRUGO
|S_IWUSR
, max_corrected_read_errors_show
,
4089 max_corrected_read_errors_store
);
4092 null_show(struct mddev
*mddev
, char *page
)
4098 new_dev_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4100 /* buf must be %d:%d\n? giving major and minor numbers */
4101 /* The new device is added to the array.
4102 * If the array has a persistent superblock, we read the
4103 * superblock to initialise info and check validity.
4104 * Otherwise, only checking done is that in bind_rdev_to_array,
4105 * which mainly checks size.
4108 int major
= simple_strtoul(buf
, &e
, 10);
4111 struct md_rdev
*rdev
;
4114 if (!*buf
|| *e
!= ':' || !e
[1] || e
[1] == '\n')
4116 minor
= simple_strtoul(e
+1, &e
, 10);
4117 if (*e
&& *e
!= '\n')
4119 dev
= MKDEV(major
, minor
);
4120 if (major
!= MAJOR(dev
) ||
4121 minor
!= MINOR(dev
))
4124 flush_workqueue(md_misc_wq
);
4126 err
= mddev_lock(mddev
);
4129 if (mddev
->persistent
) {
4130 rdev
= md_import_device(dev
, mddev
->major_version
,
4131 mddev
->minor_version
);
4132 if (!IS_ERR(rdev
) && !list_empty(&mddev
->disks
)) {
4133 struct md_rdev
*rdev0
4134 = list_entry(mddev
->disks
.next
,
4135 struct md_rdev
, same_set
);
4136 err
= super_types
[mddev
->major_version
]
4137 .load_super(rdev
, rdev0
, mddev
->minor_version
);
4141 } else if (mddev
->external
)
4142 rdev
= md_import_device(dev
, -2, -1);
4144 rdev
= md_import_device(dev
, -1, -1);
4147 mddev_unlock(mddev
);
4148 return PTR_ERR(rdev
);
4150 err
= bind_rdev_to_array(rdev
, mddev
);
4154 mddev_unlock(mddev
);
4155 return err
? err
: len
;
4158 static struct md_sysfs_entry md_new_device
=
4159 __ATTR(new_dev
, S_IWUSR
, null_show
, new_dev_store
);
4162 bitmap_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4165 unsigned long chunk
, end_chunk
;
4168 err
= mddev_lock(mddev
);
4173 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
4175 chunk
= end_chunk
= simple_strtoul(buf
, &end
, 0);
4176 if (buf
== end
) break;
4177 if (*end
== '-') { /* range */
4179 end_chunk
= simple_strtoul(buf
, &end
, 0);
4180 if (buf
== end
) break;
4182 if (*end
&& !isspace(*end
)) break;
4183 bitmap_dirty_bits(mddev
->bitmap
, chunk
, end_chunk
);
4184 buf
= skip_spaces(end
);
4186 bitmap_unplug(mddev
->bitmap
); /* flush the bits to disk */
4188 mddev_unlock(mddev
);
4192 static struct md_sysfs_entry md_bitmap
=
4193 __ATTR(bitmap_set_bits
, S_IWUSR
, null_show
, bitmap_store
);
4196 size_show(struct mddev
*mddev
, char *page
)
4198 return sprintf(page
, "%llu\n",
4199 (unsigned long long)mddev
->dev_sectors
/ 2);
4202 static int update_size(struct mddev
*mddev
, sector_t num_sectors
);
4205 size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4207 /* If array is inactive, we can reduce the component size, but
4208 * not increase it (except from 0).
4209 * If array is active, we can try an on-line resize
4212 int err
= strict_blocks_to_sectors(buf
, §ors
);
4216 err
= mddev_lock(mddev
);
4220 err
= update_size(mddev
, sectors
);
4222 md_update_sb(mddev
, 1);
4224 if (mddev
->dev_sectors
== 0 ||
4225 mddev
->dev_sectors
> sectors
)
4226 mddev
->dev_sectors
= sectors
;
4230 mddev_unlock(mddev
);
4231 return err
? err
: len
;
4234 static struct md_sysfs_entry md_size
=
4235 __ATTR(component_size
, S_IRUGO
|S_IWUSR
, size_show
, size_store
);
4237 /* Metadata version.
4239 * 'none' for arrays with no metadata (good luck...)
4240 * 'external' for arrays with externally managed metadata,
4241 * or N.M for internally known formats
4244 metadata_show(struct mddev
*mddev
, char *page
)
4246 if (mddev
->persistent
)
4247 return sprintf(page
, "%d.%d\n",
4248 mddev
->major_version
, mddev
->minor_version
);
4249 else if (mddev
->external
)
4250 return sprintf(page
, "external:%s\n", mddev
->metadata_type
);
4252 return sprintf(page
, "none\n");
4256 metadata_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4261 /* Changing the details of 'external' metadata is
4262 * always permitted. Otherwise there must be
4263 * no devices attached to the array.
4266 err
= mddev_lock(mddev
);
4270 if (mddev
->external
&& strncmp(buf
, "external:", 9) == 0)
4272 else if (!list_empty(&mddev
->disks
))
4276 if (cmd_match(buf
, "none")) {
4277 mddev
->persistent
= 0;
4278 mddev
->external
= 0;
4279 mddev
->major_version
= 0;
4280 mddev
->minor_version
= 90;
4283 if (strncmp(buf
, "external:", 9) == 0) {
4284 size_t namelen
= len
-9;
4285 if (namelen
>= sizeof(mddev
->metadata_type
))
4286 namelen
= sizeof(mddev
->metadata_type
)-1;
4287 strncpy(mddev
->metadata_type
, buf
+9, namelen
);
4288 mddev
->metadata_type
[namelen
] = 0;
4289 if (namelen
&& mddev
->metadata_type
[namelen
-1] == '\n')
4290 mddev
->metadata_type
[--namelen
] = 0;
4291 mddev
->persistent
= 0;
4292 mddev
->external
= 1;
4293 mddev
->major_version
= 0;
4294 mddev
->minor_version
= 90;
4297 major
= simple_strtoul(buf
, &e
, 10);
4299 if (e
==buf
|| *e
!= '.')
4302 minor
= simple_strtoul(buf
, &e
, 10);
4303 if (e
==buf
|| (*e
&& *e
!= '\n') )
4306 if (major
>= ARRAY_SIZE(super_types
) || super_types
[major
].name
== NULL
)
4308 mddev
->major_version
= major
;
4309 mddev
->minor_version
= minor
;
4310 mddev
->persistent
= 1;
4311 mddev
->external
= 0;
4314 mddev_unlock(mddev
);
4318 static struct md_sysfs_entry md_metadata
=
4319 __ATTR_PREALLOC(metadata_version
, S_IRUGO
|S_IWUSR
, metadata_show
, metadata_store
);
4322 action_show(struct mddev
*mddev
, char *page
)
4324 char *type
= "idle";
4325 unsigned long recovery
= mddev
->recovery
;
4326 if (test_bit(MD_RECOVERY_FROZEN
, &recovery
))
4328 else if (test_bit(MD_RECOVERY_RUNNING
, &recovery
) ||
4329 (!mddev
->ro
&& test_bit(MD_RECOVERY_NEEDED
, &recovery
))) {
4330 if (test_bit(MD_RECOVERY_RESHAPE
, &recovery
))
4332 else if (test_bit(MD_RECOVERY_SYNC
, &recovery
)) {
4333 if (!test_bit(MD_RECOVERY_REQUESTED
, &recovery
))
4335 else if (test_bit(MD_RECOVERY_CHECK
, &recovery
))
4339 } else if (test_bit(MD_RECOVERY_RECOVER
, &recovery
))
4341 else if (mddev
->reshape_position
!= MaxSector
)
4344 return sprintf(page
, "%s\n", type
);
4348 action_store(struct mddev
*mddev
, const char *page
, size_t len
)
4350 if (!mddev
->pers
|| !mddev
->pers
->sync_request
)
4354 if (cmd_match(page
, "idle") || cmd_match(page
, "frozen")) {
4355 if (cmd_match(page
, "frozen"))
4356 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4358 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4359 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
4360 mddev_lock(mddev
) == 0) {
4361 flush_workqueue(md_misc_wq
);
4362 if (mddev
->sync_thread
) {
4363 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4364 md_reap_sync_thread(mddev
);
4366 mddev_unlock(mddev
);
4368 } else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4370 else if (cmd_match(page
, "resync"))
4371 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4372 else if (cmd_match(page
, "recover")) {
4373 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4374 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
4375 } else if (cmd_match(page
, "reshape")) {
4377 if (mddev
->pers
->start_reshape
== NULL
)
4379 err
= mddev_lock(mddev
);
4381 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4384 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4385 err
= mddev
->pers
->start_reshape(mddev
);
4387 mddev_unlock(mddev
);
4391 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
4393 if (cmd_match(page
, "check"))
4394 set_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
4395 else if (!cmd_match(page
, "repair"))
4397 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4398 set_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
4399 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
4401 if (mddev
->ro
== 2) {
4402 /* A write to sync_action is enough to justify
4403 * canceling read-auto mode
4406 md_wakeup_thread(mddev
->sync_thread
);
4408 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4409 md_wakeup_thread(mddev
->thread
);
4410 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
4414 static struct md_sysfs_entry md_scan_mode
=
4415 __ATTR_PREALLOC(sync_action
, S_IRUGO
|S_IWUSR
, action_show
, action_store
);
4418 last_sync_action_show(struct mddev
*mddev
, char *page
)
4420 return sprintf(page
, "%s\n", mddev
->last_sync_action
);
4423 static struct md_sysfs_entry md_last_scan_mode
= __ATTR_RO(last_sync_action
);
4426 mismatch_cnt_show(struct mddev
*mddev
, char *page
)
4428 return sprintf(page
, "%llu\n",
4429 (unsigned long long)
4430 atomic64_read(&mddev
->resync_mismatches
));
4433 static struct md_sysfs_entry md_mismatches
= __ATTR_RO(mismatch_cnt
);
4436 sync_min_show(struct mddev
*mddev
, char *page
)
4438 return sprintf(page
, "%d (%s)\n", speed_min(mddev
),
4439 mddev
->sync_speed_min
? "local": "system");
4443 sync_min_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4448 if (strncmp(buf
, "system", 6)==0) {
4451 rv
= kstrtouint(buf
, 10, &min
);
4457 mddev
->sync_speed_min
= min
;
4461 static struct md_sysfs_entry md_sync_min
=
4462 __ATTR(sync_speed_min
, S_IRUGO
|S_IWUSR
, sync_min_show
, sync_min_store
);
4465 sync_max_show(struct mddev
*mddev
, char *page
)
4467 return sprintf(page
, "%d (%s)\n", speed_max(mddev
),
4468 mddev
->sync_speed_max
? "local": "system");
4472 sync_max_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4477 if (strncmp(buf
, "system", 6)==0) {
4480 rv
= kstrtouint(buf
, 10, &max
);
4486 mddev
->sync_speed_max
= max
;
4490 static struct md_sysfs_entry md_sync_max
=
4491 __ATTR(sync_speed_max
, S_IRUGO
|S_IWUSR
, sync_max_show
, sync_max_store
);
4494 degraded_show(struct mddev
*mddev
, char *page
)
4496 return sprintf(page
, "%d\n", mddev
->degraded
);
4498 static struct md_sysfs_entry md_degraded
= __ATTR_RO(degraded
);
4501 sync_force_parallel_show(struct mddev
*mddev
, char *page
)
4503 return sprintf(page
, "%d\n", mddev
->parallel_resync
);
4507 sync_force_parallel_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4511 if (kstrtol(buf
, 10, &n
))
4514 if (n
!= 0 && n
!= 1)
4517 mddev
->parallel_resync
= n
;
4519 if (mddev
->sync_thread
)
4520 wake_up(&resync_wait
);
4525 /* force parallel resync, even with shared block devices */
4526 static struct md_sysfs_entry md_sync_force_parallel
=
4527 __ATTR(sync_force_parallel
, S_IRUGO
|S_IWUSR
,
4528 sync_force_parallel_show
, sync_force_parallel_store
);
4531 sync_speed_show(struct mddev
*mddev
, char *page
)
4533 unsigned long resync
, dt
, db
;
4534 if (mddev
->curr_resync
== 0)
4535 return sprintf(page
, "none\n");
4536 resync
= mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
);
4537 dt
= (jiffies
- mddev
->resync_mark
) / HZ
;
4539 db
= resync
- mddev
->resync_mark_cnt
;
4540 return sprintf(page
, "%lu\n", db
/dt
/2); /* K/sec */
4543 static struct md_sysfs_entry md_sync_speed
= __ATTR_RO(sync_speed
);
4546 sync_completed_show(struct mddev
*mddev
, char *page
)
4548 unsigned long long max_sectors
, resync
;
4550 if (!test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4551 return sprintf(page
, "none\n");
4553 if (mddev
->curr_resync
== 1 ||
4554 mddev
->curr_resync
== 2)
4555 return sprintf(page
, "delayed\n");
4557 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
4558 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
4559 max_sectors
= mddev
->resync_max_sectors
;
4561 max_sectors
= mddev
->dev_sectors
;
4563 resync
= mddev
->curr_resync_completed
;
4564 return sprintf(page
, "%llu / %llu\n", resync
, max_sectors
);
4567 static struct md_sysfs_entry md_sync_completed
=
4568 __ATTR_PREALLOC(sync_completed
, S_IRUGO
, sync_completed_show
, NULL
);
4571 min_sync_show(struct mddev
*mddev
, char *page
)
4573 return sprintf(page
, "%llu\n",
4574 (unsigned long long)mddev
->resync_min
);
4577 min_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4579 unsigned long long min
;
4582 if (kstrtoull(buf
, 10, &min
))
4585 spin_lock(&mddev
->lock
);
4587 if (min
> mddev
->resync_max
)
4591 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4594 /* Round down to multiple of 4K for safety */
4595 mddev
->resync_min
= round_down(min
, 8);
4599 spin_unlock(&mddev
->lock
);
4603 static struct md_sysfs_entry md_min_sync
=
4604 __ATTR(sync_min
, S_IRUGO
|S_IWUSR
, min_sync_show
, min_sync_store
);
4607 max_sync_show(struct mddev
*mddev
, char *page
)
4609 if (mddev
->resync_max
== MaxSector
)
4610 return sprintf(page
, "max\n");
4612 return sprintf(page
, "%llu\n",
4613 (unsigned long long)mddev
->resync_max
);
4616 max_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4619 spin_lock(&mddev
->lock
);
4620 if (strncmp(buf
, "max", 3) == 0)
4621 mddev
->resync_max
= MaxSector
;
4623 unsigned long long max
;
4627 if (kstrtoull(buf
, 10, &max
))
4629 if (max
< mddev
->resync_min
)
4633 if (max
< mddev
->resync_max
&&
4635 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4638 /* Must be a multiple of chunk_size */
4639 chunk
= mddev
->chunk_sectors
;
4641 sector_t temp
= max
;
4644 if (sector_div(temp
, chunk
))
4647 mddev
->resync_max
= max
;
4649 wake_up(&mddev
->recovery_wait
);
4652 spin_unlock(&mddev
->lock
);
4656 static struct md_sysfs_entry md_max_sync
=
4657 __ATTR(sync_max
, S_IRUGO
|S_IWUSR
, max_sync_show
, max_sync_store
);
4660 suspend_lo_show(struct mddev
*mddev
, char *page
)
4662 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_lo
);
4666 suspend_lo_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4668 unsigned long long old
, new;
4671 err
= kstrtoull(buf
, 10, &new);
4674 if (new != (sector_t
)new)
4677 err
= mddev_lock(mddev
);
4681 if (mddev
->pers
== NULL
||
4682 mddev
->pers
->quiesce
== NULL
)
4684 old
= mddev
->suspend_lo
;
4685 mddev
->suspend_lo
= new;
4687 /* Shrinking suspended region */
4688 mddev
->pers
->quiesce(mddev
, 2);
4690 /* Expanding suspended region - need to wait */
4691 mddev
->pers
->quiesce(mddev
, 1);
4692 mddev
->pers
->quiesce(mddev
, 0);
4696 mddev_unlock(mddev
);
4699 static struct md_sysfs_entry md_suspend_lo
=
4700 __ATTR(suspend_lo
, S_IRUGO
|S_IWUSR
, suspend_lo_show
, suspend_lo_store
);
4703 suspend_hi_show(struct mddev
*mddev
, char *page
)
4705 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_hi
);
4709 suspend_hi_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4711 unsigned long long old
, new;
4714 err
= kstrtoull(buf
, 10, &new);
4717 if (new != (sector_t
)new)
4720 err
= mddev_lock(mddev
);
4724 if (mddev
->pers
== NULL
||
4725 mddev
->pers
->quiesce
== NULL
)
4727 old
= mddev
->suspend_hi
;
4728 mddev
->suspend_hi
= new;
4730 /* Shrinking suspended region */
4731 mddev
->pers
->quiesce(mddev
, 2);
4733 /* Expanding suspended region - need to wait */
4734 mddev
->pers
->quiesce(mddev
, 1);
4735 mddev
->pers
->quiesce(mddev
, 0);
4739 mddev_unlock(mddev
);
4742 static struct md_sysfs_entry md_suspend_hi
=
4743 __ATTR(suspend_hi
, S_IRUGO
|S_IWUSR
, suspend_hi_show
, suspend_hi_store
);
4746 reshape_position_show(struct mddev
*mddev
, char *page
)
4748 if (mddev
->reshape_position
!= MaxSector
)
4749 return sprintf(page
, "%llu\n",
4750 (unsigned long long)mddev
->reshape_position
);
4751 strcpy(page
, "none\n");
4756 reshape_position_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4758 struct md_rdev
*rdev
;
4759 unsigned long long new;
4762 err
= kstrtoull(buf
, 10, &new);
4765 if (new != (sector_t
)new)
4767 err
= mddev_lock(mddev
);
4773 mddev
->reshape_position
= new;
4774 mddev
->delta_disks
= 0;
4775 mddev
->reshape_backwards
= 0;
4776 mddev
->new_level
= mddev
->level
;
4777 mddev
->new_layout
= mddev
->layout
;
4778 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
4779 rdev_for_each(rdev
, mddev
)
4780 rdev
->new_data_offset
= rdev
->data_offset
;
4783 mddev_unlock(mddev
);
4787 static struct md_sysfs_entry md_reshape_position
=
4788 __ATTR(reshape_position
, S_IRUGO
|S_IWUSR
, reshape_position_show
,
4789 reshape_position_store
);
4792 reshape_direction_show(struct mddev
*mddev
, char *page
)
4794 return sprintf(page
, "%s\n",
4795 mddev
->reshape_backwards
? "backwards" : "forwards");
4799 reshape_direction_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4804 if (cmd_match(buf
, "forwards"))
4806 else if (cmd_match(buf
, "backwards"))
4810 if (mddev
->reshape_backwards
== backwards
)
4813 err
= mddev_lock(mddev
);
4816 /* check if we are allowed to change */
4817 if (mddev
->delta_disks
)
4819 else if (mddev
->persistent
&&
4820 mddev
->major_version
== 0)
4823 mddev
->reshape_backwards
= backwards
;
4824 mddev_unlock(mddev
);
4828 static struct md_sysfs_entry md_reshape_direction
=
4829 __ATTR(reshape_direction
, S_IRUGO
|S_IWUSR
, reshape_direction_show
,
4830 reshape_direction_store
);
4833 array_size_show(struct mddev
*mddev
, char *page
)
4835 if (mddev
->external_size
)
4836 return sprintf(page
, "%llu\n",
4837 (unsigned long long)mddev
->array_sectors
/2);
4839 return sprintf(page
, "default\n");
4843 array_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4848 err
= mddev_lock(mddev
);
4852 /* cluster raid doesn't support change array_sectors */
4853 if (mddev_is_clustered(mddev
))
4856 if (strncmp(buf
, "default", 7) == 0) {
4858 sectors
= mddev
->pers
->size(mddev
, 0, 0);
4860 sectors
= mddev
->array_sectors
;
4862 mddev
->external_size
= 0;
4864 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
4866 else if (mddev
->pers
&& mddev
->pers
->size(mddev
, 0, 0) < sectors
)
4869 mddev
->external_size
= 1;
4873 mddev
->array_sectors
= sectors
;
4875 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
4876 revalidate_disk(mddev
->gendisk
);
4879 mddev_unlock(mddev
);
4883 static struct md_sysfs_entry md_array_size
=
4884 __ATTR(array_size
, S_IRUGO
|S_IWUSR
, array_size_show
,
4887 static struct attribute
*md_default_attrs
[] = {
4890 &md_raid_disks
.attr
,
4891 &md_chunk_size
.attr
,
4893 &md_resync_start
.attr
,
4895 &md_new_device
.attr
,
4896 &md_safe_delay
.attr
,
4897 &md_array_state
.attr
,
4898 &md_reshape_position
.attr
,
4899 &md_reshape_direction
.attr
,
4900 &md_array_size
.attr
,
4901 &max_corr_read_errors
.attr
,
4905 static struct attribute
*md_redundancy_attrs
[] = {
4907 &md_last_scan_mode
.attr
,
4908 &md_mismatches
.attr
,
4911 &md_sync_speed
.attr
,
4912 &md_sync_force_parallel
.attr
,
4913 &md_sync_completed
.attr
,
4916 &md_suspend_lo
.attr
,
4917 &md_suspend_hi
.attr
,
4922 static struct attribute_group md_redundancy_group
= {
4924 .attrs
= md_redundancy_attrs
,
4928 md_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
4930 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4931 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
4936 spin_lock(&all_mddevs_lock
);
4937 if (list_empty(&mddev
->all_mddevs
)) {
4938 spin_unlock(&all_mddevs_lock
);
4942 spin_unlock(&all_mddevs_lock
);
4944 rv
= entry
->show(mddev
, page
);
4950 md_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
4951 const char *page
, size_t length
)
4953 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4954 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
4959 if (!capable(CAP_SYS_ADMIN
))
4961 spin_lock(&all_mddevs_lock
);
4962 if (list_empty(&mddev
->all_mddevs
)) {
4963 spin_unlock(&all_mddevs_lock
);
4967 spin_unlock(&all_mddevs_lock
);
4968 rv
= entry
->store(mddev
, page
, length
);
4973 static void md_free(struct kobject
*ko
)
4975 struct mddev
*mddev
= container_of(ko
, struct mddev
, kobj
);
4977 if (mddev
->sysfs_state
)
4978 sysfs_put(mddev
->sysfs_state
);
4981 blk_cleanup_queue(mddev
->queue
);
4982 if (mddev
->gendisk
) {
4983 del_gendisk(mddev
->gendisk
);
4984 put_disk(mddev
->gendisk
);
4990 static const struct sysfs_ops md_sysfs_ops
= {
4991 .show
= md_attr_show
,
4992 .store
= md_attr_store
,
4994 static struct kobj_type md_ktype
= {
4996 .sysfs_ops
= &md_sysfs_ops
,
4997 .default_attrs
= md_default_attrs
,
5002 static void mddev_delayed_delete(struct work_struct
*ws
)
5004 struct mddev
*mddev
= container_of(ws
, struct mddev
, del_work
);
5006 sysfs_remove_group(&mddev
->kobj
, &md_bitmap_group
);
5007 kobject_del(&mddev
->kobj
);
5008 kobject_put(&mddev
->kobj
);
5011 static int md_alloc(dev_t dev
, char *name
)
5013 static DEFINE_MUTEX(disks_mutex
);
5014 struct mddev
*mddev
= mddev_find(dev
);
5015 struct gendisk
*disk
;
5024 partitioned
= (MAJOR(mddev
->unit
) != MD_MAJOR
);
5025 shift
= partitioned
? MdpMinorShift
: 0;
5026 unit
= MINOR(mddev
->unit
) >> shift
;
5028 /* wait for any previous instance of this device to be
5029 * completely removed (mddev_delayed_delete).
5031 flush_workqueue(md_misc_wq
);
5033 mutex_lock(&disks_mutex
);
5039 /* Need to ensure that 'name' is not a duplicate.
5041 struct mddev
*mddev2
;
5042 spin_lock(&all_mddevs_lock
);
5044 list_for_each_entry(mddev2
, &all_mddevs
, all_mddevs
)
5045 if (mddev2
->gendisk
&&
5046 strcmp(mddev2
->gendisk
->disk_name
, name
) == 0) {
5047 spin_unlock(&all_mddevs_lock
);
5050 spin_unlock(&all_mddevs_lock
);
5054 mddev
->queue
= blk_alloc_queue(GFP_KERNEL
);
5057 mddev
->queue
->queuedata
= mddev
;
5059 blk_queue_make_request(mddev
->queue
, md_make_request
);
5060 blk_set_stacking_limits(&mddev
->queue
->limits
);
5062 disk
= alloc_disk(1 << shift
);
5064 blk_cleanup_queue(mddev
->queue
);
5065 mddev
->queue
= NULL
;
5068 disk
->major
= MAJOR(mddev
->unit
);
5069 disk
->first_minor
= unit
<< shift
;
5071 strcpy(disk
->disk_name
, name
);
5072 else if (partitioned
)
5073 sprintf(disk
->disk_name
, "md_d%d", unit
);
5075 sprintf(disk
->disk_name
, "md%d", unit
);
5076 disk
->fops
= &md_fops
;
5077 disk
->private_data
= mddev
;
5078 disk
->queue
= mddev
->queue
;
5079 blk_queue_write_cache(mddev
->queue
, true, true);
5080 /* Allow extended partitions. This makes the
5081 * 'mdp' device redundant, but we can't really
5084 disk
->flags
|= GENHD_FL_EXT_DEVT
;
5085 mddev
->gendisk
= disk
;
5086 /* As soon as we call add_disk(), another thread could get
5087 * through to md_open, so make sure it doesn't get too far
5089 mutex_lock(&mddev
->open_mutex
);
5092 error
= kobject_init_and_add(&mddev
->kobj
, &md_ktype
,
5093 &disk_to_dev(disk
)->kobj
, "%s", "md");
5095 /* This isn't possible, but as kobject_init_and_add is marked
5096 * __must_check, we must do something with the result
5098 pr_debug("md: cannot register %s/md - name in use\n",
5102 if (mddev
->kobj
.sd
&&
5103 sysfs_create_group(&mddev
->kobj
, &md_bitmap_group
))
5104 pr_debug("pointless warning\n");
5105 mutex_unlock(&mddev
->open_mutex
);
5107 mutex_unlock(&disks_mutex
);
5108 if (!error
&& mddev
->kobj
.sd
) {
5109 kobject_uevent(&mddev
->kobj
, KOBJ_ADD
);
5110 mddev
->sysfs_state
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "array_state");
5116 static struct kobject
*md_probe(dev_t dev
, int *part
, void *data
)
5118 md_alloc(dev
, NULL
);
5122 static int add_named_array(const char *val
, struct kernel_param
*kp
)
5124 /* val must be "md_*" where * is not all digits.
5125 * We allocate an array with a large free minor number, and
5126 * set the name to val. val must not already be an active name.
5128 int len
= strlen(val
);
5129 char buf
[DISK_NAME_LEN
];
5131 while (len
&& val
[len
-1] == '\n')
5133 if (len
>= DISK_NAME_LEN
)
5135 strlcpy(buf
, val
, len
+1);
5136 if (strncmp(buf
, "md_", 3) != 0)
5138 return md_alloc(0, buf
);
5141 static void md_safemode_timeout(unsigned long data
)
5143 struct mddev
*mddev
= (struct mddev
*) data
;
5145 if (!atomic_read(&mddev
->writes_pending
)) {
5146 mddev
->safemode
= 1;
5147 if (mddev
->external
)
5148 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5150 md_wakeup_thread(mddev
->thread
);
5153 static int start_dirty_degraded
;
5155 int md_run(struct mddev
*mddev
)
5158 struct md_rdev
*rdev
;
5159 struct md_personality
*pers
;
5161 if (list_empty(&mddev
->disks
))
5162 /* cannot run an array with no devices.. */
5167 /* Cannot run until previous stop completes properly */
5168 if (mddev
->sysfs_active
)
5172 * Analyze all RAID superblock(s)
5174 if (!mddev
->raid_disks
) {
5175 if (!mddev
->persistent
)
5180 if (mddev
->level
!= LEVEL_NONE
)
5181 request_module("md-level-%d", mddev
->level
);
5182 else if (mddev
->clevel
[0])
5183 request_module("md-%s", mddev
->clevel
);
5186 * Drop all container device buffers, from now on
5187 * the only valid external interface is through the md
5190 rdev_for_each(rdev
, mddev
) {
5191 if (test_bit(Faulty
, &rdev
->flags
))
5193 sync_blockdev(rdev
->bdev
);
5194 invalidate_bdev(rdev
->bdev
);
5196 /* perform some consistency tests on the device.
5197 * We don't want the data to overlap the metadata,
5198 * Internal Bitmap issues have been handled elsewhere.
5200 if (rdev
->meta_bdev
) {
5201 /* Nothing to check */;
5202 } else if (rdev
->data_offset
< rdev
->sb_start
) {
5203 if (mddev
->dev_sectors
&&
5204 rdev
->data_offset
+ mddev
->dev_sectors
5206 pr_warn("md: %s: data overlaps metadata\n",
5211 if (rdev
->sb_start
+ rdev
->sb_size
/512
5212 > rdev
->data_offset
) {
5213 pr_warn("md: %s: metadata overlaps data\n",
5218 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
5221 if (mddev
->bio_set
== NULL
) {
5222 mddev
->bio_set
= bioset_create(BIO_POOL_SIZE
, 0);
5223 if (!mddev
->bio_set
)
5227 spin_lock(&pers_lock
);
5228 pers
= find_pers(mddev
->level
, mddev
->clevel
);
5229 if (!pers
|| !try_module_get(pers
->owner
)) {
5230 spin_unlock(&pers_lock
);
5231 if (mddev
->level
!= LEVEL_NONE
)
5232 pr_warn("md: personality for level %d is not loaded!\n",
5235 pr_warn("md: personality for level %s is not loaded!\n",
5239 spin_unlock(&pers_lock
);
5240 if (mddev
->level
!= pers
->level
) {
5241 mddev
->level
= pers
->level
;
5242 mddev
->new_level
= pers
->level
;
5244 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
5246 if (mddev
->reshape_position
!= MaxSector
&&
5247 pers
->start_reshape
== NULL
) {
5248 /* This personality cannot handle reshaping... */
5249 module_put(pers
->owner
);
5253 if (pers
->sync_request
) {
5254 /* Warn if this is a potentially silly
5257 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
5258 struct md_rdev
*rdev2
;
5261 rdev_for_each(rdev
, mddev
)
5262 rdev_for_each(rdev2
, mddev
) {
5264 rdev
->bdev
->bd_contains
==
5265 rdev2
->bdev
->bd_contains
) {
5266 pr_warn("%s: WARNING: %s appears to be on the same physical disk as %s.\n",
5268 bdevname(rdev
->bdev
,b
),
5269 bdevname(rdev2
->bdev
,b2
));
5275 pr_warn("True protection against single-disk failure might be compromised.\n");
5278 mddev
->recovery
= 0;
5279 /* may be over-ridden by personality */
5280 mddev
->resync_max_sectors
= mddev
->dev_sectors
;
5282 mddev
->ok_start_degraded
= start_dirty_degraded
;
5284 if (start_readonly
&& mddev
->ro
== 0)
5285 mddev
->ro
= 2; /* read-only, but switch on first write */
5288 * NOTE: some pers->run(), for example r5l_recovery_log(), wakes
5289 * up mddev->thread. It is important to initialize critical
5290 * resources for mddev->thread BEFORE calling pers->run().
5292 err
= pers
->run(mddev
);
5294 pr_warn("md: pers->run() failed ...\n");
5295 else if (pers
->size(mddev
, 0, 0) < mddev
->array_sectors
) {
5296 WARN_ONCE(!mddev
->external_size
,
5297 "%s: default size too small, but 'external_size' not in effect?\n",
5299 pr_warn("md: invalid array_size %llu > default size %llu\n",
5300 (unsigned long long)mddev
->array_sectors
/ 2,
5301 (unsigned long long)pers
->size(mddev
, 0, 0) / 2);
5304 if (err
== 0 && pers
->sync_request
&&
5305 (mddev
->bitmap_info
.file
|| mddev
->bitmap_info
.offset
)) {
5306 struct bitmap
*bitmap
;
5308 bitmap
= bitmap_create(mddev
, -1);
5309 if (IS_ERR(bitmap
)) {
5310 err
= PTR_ERR(bitmap
);
5311 pr_warn("%s: failed to create bitmap (%d)\n",
5312 mdname(mddev
), err
);
5314 mddev
->bitmap
= bitmap
;
5318 mddev_detach(mddev
);
5320 pers
->free(mddev
, mddev
->private);
5321 mddev
->private = NULL
;
5322 module_put(pers
->owner
);
5323 bitmap_destroy(mddev
);
5329 rdev_for_each(rdev
, mddev
) {
5330 if (rdev
->raid_disk
>= 0 &&
5331 !blk_queue_nonrot(bdev_get_queue(rdev
->bdev
))) {
5336 if (mddev
->degraded
)
5339 queue_flag_set_unlocked(QUEUE_FLAG_NONROT
, mddev
->queue
);
5341 queue_flag_clear_unlocked(QUEUE_FLAG_NONROT
, mddev
->queue
);
5342 mddev
->queue
->backing_dev_info
->congested_data
= mddev
;
5343 mddev
->queue
->backing_dev_info
->congested_fn
= md_congested
;
5345 if (pers
->sync_request
) {
5346 if (mddev
->kobj
.sd
&&
5347 sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
5348 pr_warn("md: cannot register extra attributes for %s\n",
5350 mddev
->sysfs_action
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "sync_action");
5351 } else if (mddev
->ro
== 2) /* auto-readonly not meaningful */
5354 atomic_set(&mddev
->writes_pending
,0);
5355 atomic_set(&mddev
->max_corr_read_errors
,
5356 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS
);
5357 mddev
->safemode
= 0;
5358 if (mddev_is_clustered(mddev
))
5359 mddev
->safemode_delay
= 0;
5361 mddev
->safemode_delay
= (200 * HZ
)/1000 +1; /* 200 msec delay */
5364 spin_lock(&mddev
->lock
);
5366 spin_unlock(&mddev
->lock
);
5367 rdev_for_each(rdev
, mddev
)
5368 if (rdev
->raid_disk
>= 0)
5369 if (sysfs_link_rdev(mddev
, rdev
))
5370 /* failure here is OK */;
5372 if (mddev
->degraded
&& !mddev
->ro
)
5373 /* This ensures that recovering status is reported immediately
5374 * via sysfs - until a lack of spares is confirmed.
5376 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
5377 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5379 if (mddev
->sb_flags
)
5380 md_update_sb(mddev
, 0);
5382 md_new_event(mddev
);
5383 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5384 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
5385 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
5388 EXPORT_SYMBOL_GPL(md_run
);
5390 static int do_md_run(struct mddev
*mddev
)
5394 err
= md_run(mddev
);
5397 err
= bitmap_load(mddev
);
5399 bitmap_destroy(mddev
);
5403 if (mddev_is_clustered(mddev
))
5404 md_allow_write(mddev
);
5406 md_wakeup_thread(mddev
->thread
);
5407 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
5409 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
5410 revalidate_disk(mddev
->gendisk
);
5412 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
5417 static int restart_array(struct mddev
*mddev
)
5419 struct gendisk
*disk
= mddev
->gendisk
;
5421 /* Complain if it has no devices */
5422 if (list_empty(&mddev
->disks
))
5428 if (test_bit(MD_HAS_JOURNAL
, &mddev
->flags
)) {
5429 struct md_rdev
*rdev
;
5430 bool has_journal
= false;
5433 rdev_for_each_rcu(rdev
, mddev
) {
5434 if (test_bit(Journal
, &rdev
->flags
) &&
5435 !test_bit(Faulty
, &rdev
->flags
)) {
5442 /* Don't restart rw with journal missing/faulty */
5447 mddev
->safemode
= 0;
5449 set_disk_ro(disk
, 0);
5450 pr_debug("md: %s switched to read-write mode.\n", mdname(mddev
));
5451 /* Kick recovery or resync if necessary */
5452 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5453 md_wakeup_thread(mddev
->thread
);
5454 md_wakeup_thread(mddev
->sync_thread
);
5455 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5459 static void md_clean(struct mddev
*mddev
)
5461 mddev
->array_sectors
= 0;
5462 mddev
->external_size
= 0;
5463 mddev
->dev_sectors
= 0;
5464 mddev
->raid_disks
= 0;
5465 mddev
->recovery_cp
= 0;
5466 mddev
->resync_min
= 0;
5467 mddev
->resync_max
= MaxSector
;
5468 mddev
->reshape_position
= MaxSector
;
5469 mddev
->external
= 0;
5470 mddev
->persistent
= 0;
5471 mddev
->level
= LEVEL_NONE
;
5472 mddev
->clevel
[0] = 0;
5474 mddev
->sb_flags
= 0;
5476 mddev
->metadata_type
[0] = 0;
5477 mddev
->chunk_sectors
= 0;
5478 mddev
->ctime
= mddev
->utime
= 0;
5480 mddev
->max_disks
= 0;
5482 mddev
->can_decrease_events
= 0;
5483 mddev
->delta_disks
= 0;
5484 mddev
->reshape_backwards
= 0;
5485 mddev
->new_level
= LEVEL_NONE
;
5486 mddev
->new_layout
= 0;
5487 mddev
->new_chunk_sectors
= 0;
5488 mddev
->curr_resync
= 0;
5489 atomic64_set(&mddev
->resync_mismatches
, 0);
5490 mddev
->suspend_lo
= mddev
->suspend_hi
= 0;
5491 mddev
->sync_speed_min
= mddev
->sync_speed_max
= 0;
5492 mddev
->recovery
= 0;
5495 mddev
->degraded
= 0;
5496 mddev
->safemode
= 0;
5497 mddev
->private = NULL
;
5498 mddev
->cluster_info
= NULL
;
5499 mddev
->bitmap_info
.offset
= 0;
5500 mddev
->bitmap_info
.default_offset
= 0;
5501 mddev
->bitmap_info
.default_space
= 0;
5502 mddev
->bitmap_info
.chunksize
= 0;
5503 mddev
->bitmap_info
.daemon_sleep
= 0;
5504 mddev
->bitmap_info
.max_write_behind
= 0;
5505 mddev
->bitmap_info
.nodes
= 0;
5508 static void __md_stop_writes(struct mddev
*mddev
)
5510 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5511 flush_workqueue(md_misc_wq
);
5512 if (mddev
->sync_thread
) {
5513 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5514 md_reap_sync_thread(mddev
);
5517 del_timer_sync(&mddev
->safemode_timer
);
5519 if (mddev
->pers
&& mddev
->pers
->quiesce
) {
5520 mddev
->pers
->quiesce(mddev
, 1);
5521 mddev
->pers
->quiesce(mddev
, 0);
5523 bitmap_flush(mddev
);
5525 if (mddev
->ro
== 0 &&
5526 ((!mddev
->in_sync
&& !mddev_is_clustered(mddev
)) ||
5528 /* mark array as shutdown cleanly */
5529 if (!mddev_is_clustered(mddev
))
5531 md_update_sb(mddev
, 1);
5535 void md_stop_writes(struct mddev
*mddev
)
5537 mddev_lock_nointr(mddev
);
5538 __md_stop_writes(mddev
);
5539 mddev_unlock(mddev
);
5541 EXPORT_SYMBOL_GPL(md_stop_writes
);
5543 static void mddev_detach(struct mddev
*mddev
)
5545 struct bitmap
*bitmap
= mddev
->bitmap
;
5546 /* wait for behind writes to complete */
5547 if (bitmap
&& atomic_read(&bitmap
->behind_writes
) > 0) {
5548 pr_debug("md:%s: behind writes in progress - waiting to stop.\n",
5550 /* need to kick something here to make sure I/O goes? */
5551 wait_event(bitmap
->behind_wait
,
5552 atomic_read(&bitmap
->behind_writes
) == 0);
5554 if (mddev
->pers
&& mddev
->pers
->quiesce
) {
5555 mddev
->pers
->quiesce(mddev
, 1);
5556 mddev
->pers
->quiesce(mddev
, 0);
5558 md_unregister_thread(&mddev
->thread
);
5560 blk_sync_queue(mddev
->queue
); /* the unplug fn references 'conf'*/
5563 static void __md_stop(struct mddev
*mddev
)
5565 struct md_personality
*pers
= mddev
->pers
;
5566 mddev_detach(mddev
);
5567 /* Ensure ->event_work is done */
5568 flush_workqueue(md_misc_wq
);
5569 spin_lock(&mddev
->lock
);
5571 spin_unlock(&mddev
->lock
);
5572 pers
->free(mddev
, mddev
->private);
5573 mddev
->private = NULL
;
5574 if (pers
->sync_request
&& mddev
->to_remove
== NULL
)
5575 mddev
->to_remove
= &md_redundancy_group
;
5576 module_put(pers
->owner
);
5577 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5580 void md_stop(struct mddev
*mddev
)
5582 /* stop the array and free an attached data structures.
5583 * This is called from dm-raid
5586 bitmap_destroy(mddev
);
5588 bioset_free(mddev
->bio_set
);
5591 EXPORT_SYMBOL_GPL(md_stop
);
5593 static int md_set_readonly(struct mddev
*mddev
, struct block_device
*bdev
)
5598 if (!test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
)) {
5600 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5601 md_wakeup_thread(mddev
->thread
);
5603 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
5604 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5605 if (mddev
->sync_thread
)
5606 /* Thread might be blocked waiting for metadata update
5607 * which will now never happen */
5608 wake_up_process(mddev
->sync_thread
->tsk
);
5610 if (mddev
->external
&& test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
))
5612 mddev_unlock(mddev
);
5613 wait_event(resync_wait
, !test_bit(MD_RECOVERY_RUNNING
,
5615 wait_event(mddev
->sb_wait
,
5616 !test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
));
5617 mddev_lock_nointr(mddev
);
5619 mutex_lock(&mddev
->open_mutex
);
5620 if ((mddev
->pers
&& atomic_read(&mddev
->openers
) > !!bdev
) ||
5621 mddev
->sync_thread
||
5622 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
)) {
5623 pr_warn("md: %s still in use.\n",mdname(mddev
));
5625 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5626 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5627 md_wakeup_thread(mddev
->thread
);
5633 __md_stop_writes(mddev
);
5639 set_disk_ro(mddev
->gendisk
, 1);
5640 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5641 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5642 md_wakeup_thread(mddev
->thread
);
5643 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5647 mutex_unlock(&mddev
->open_mutex
);
5652 * 0 - completely stop and dis-assemble array
5653 * 2 - stop but do not disassemble array
5655 static int do_md_stop(struct mddev
*mddev
, int mode
,
5656 struct block_device
*bdev
)
5658 struct gendisk
*disk
= mddev
->gendisk
;
5659 struct md_rdev
*rdev
;
5662 if (!test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
)) {
5664 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5665 md_wakeup_thread(mddev
->thread
);
5667 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
5668 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5669 if (mddev
->sync_thread
)
5670 /* Thread might be blocked waiting for metadata update
5671 * which will now never happen */
5672 wake_up_process(mddev
->sync_thread
->tsk
);
5674 mddev_unlock(mddev
);
5675 wait_event(resync_wait
, (mddev
->sync_thread
== NULL
&&
5676 !test_bit(MD_RECOVERY_RUNNING
,
5677 &mddev
->recovery
)));
5678 mddev_lock_nointr(mddev
);
5680 mutex_lock(&mddev
->open_mutex
);
5681 if ((mddev
->pers
&& atomic_read(&mddev
->openers
) > !!bdev
) ||
5682 mddev
->sysfs_active
||
5683 mddev
->sync_thread
||
5684 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
)) {
5685 pr_warn("md: %s still in use.\n",mdname(mddev
));
5686 mutex_unlock(&mddev
->open_mutex
);
5688 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5689 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5690 md_wakeup_thread(mddev
->thread
);
5696 set_disk_ro(disk
, 0);
5698 __md_stop_writes(mddev
);
5700 mddev
->queue
->backing_dev_info
->congested_fn
= NULL
;
5702 /* tell userspace to handle 'inactive' */
5703 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5705 rdev_for_each(rdev
, mddev
)
5706 if (rdev
->raid_disk
>= 0)
5707 sysfs_unlink_rdev(mddev
, rdev
);
5709 set_capacity(disk
, 0);
5710 mutex_unlock(&mddev
->open_mutex
);
5712 revalidate_disk(disk
);
5717 mutex_unlock(&mddev
->open_mutex
);
5719 * Free resources if final stop
5722 pr_info("md: %s stopped.\n", mdname(mddev
));
5724 bitmap_destroy(mddev
);
5725 if (mddev
->bitmap_info
.file
) {
5726 struct file
*f
= mddev
->bitmap_info
.file
;
5727 spin_lock(&mddev
->lock
);
5728 mddev
->bitmap_info
.file
= NULL
;
5729 spin_unlock(&mddev
->lock
);
5732 mddev
->bitmap_info
.offset
= 0;
5734 export_array(mddev
);
5737 if (mddev
->hold_active
== UNTIL_STOP
)
5738 mddev
->hold_active
= 0;
5740 md_new_event(mddev
);
5741 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5746 static void autorun_array(struct mddev
*mddev
)
5748 struct md_rdev
*rdev
;
5751 if (list_empty(&mddev
->disks
))
5754 pr_info("md: running: ");
5756 rdev_for_each(rdev
, mddev
) {
5757 char b
[BDEVNAME_SIZE
];
5758 pr_cont("<%s>", bdevname(rdev
->bdev
,b
));
5762 err
= do_md_run(mddev
);
5764 pr_warn("md: do_md_run() returned %d\n", err
);
5765 do_md_stop(mddev
, 0, NULL
);
5770 * lets try to run arrays based on all disks that have arrived
5771 * until now. (those are in pending_raid_disks)
5773 * the method: pick the first pending disk, collect all disks with
5774 * the same UUID, remove all from the pending list and put them into
5775 * the 'same_array' list. Then order this list based on superblock
5776 * update time (freshest comes first), kick out 'old' disks and
5777 * compare superblocks. If everything's fine then run it.
5779 * If "unit" is allocated, then bump its reference count
5781 static void autorun_devices(int part
)
5783 struct md_rdev
*rdev0
, *rdev
, *tmp
;
5784 struct mddev
*mddev
;
5785 char b
[BDEVNAME_SIZE
];
5787 pr_info("md: autorun ...\n");
5788 while (!list_empty(&pending_raid_disks
)) {
5791 LIST_HEAD(candidates
);
5792 rdev0
= list_entry(pending_raid_disks
.next
,
5793 struct md_rdev
, same_set
);
5795 pr_debug("md: considering %s ...\n", bdevname(rdev0
->bdev
,b
));
5796 INIT_LIST_HEAD(&candidates
);
5797 rdev_for_each_list(rdev
, tmp
, &pending_raid_disks
)
5798 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
5799 pr_debug("md: adding %s ...\n",
5800 bdevname(rdev
->bdev
,b
));
5801 list_move(&rdev
->same_set
, &candidates
);
5804 * now we have a set of devices, with all of them having
5805 * mostly sane superblocks. It's time to allocate the
5809 dev
= MKDEV(mdp_major
,
5810 rdev0
->preferred_minor
<< MdpMinorShift
);
5811 unit
= MINOR(dev
) >> MdpMinorShift
;
5813 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
5816 if (rdev0
->preferred_minor
!= unit
) {
5817 pr_warn("md: unit number in %s is bad: %d\n",
5818 bdevname(rdev0
->bdev
, b
), rdev0
->preferred_minor
);
5822 md_probe(dev
, NULL
, NULL
);
5823 mddev
= mddev_find(dev
);
5824 if (!mddev
|| !mddev
->gendisk
) {
5829 if (mddev_lock(mddev
))
5830 pr_warn("md: %s locked, cannot run\n", mdname(mddev
));
5831 else if (mddev
->raid_disks
|| mddev
->major_version
5832 || !list_empty(&mddev
->disks
)) {
5833 pr_warn("md: %s already running, cannot run %s\n",
5834 mdname(mddev
), bdevname(rdev0
->bdev
,b
));
5835 mddev_unlock(mddev
);
5837 pr_debug("md: created %s\n", mdname(mddev
));
5838 mddev
->persistent
= 1;
5839 rdev_for_each_list(rdev
, tmp
, &candidates
) {
5840 list_del_init(&rdev
->same_set
);
5841 if (bind_rdev_to_array(rdev
, mddev
))
5844 autorun_array(mddev
);
5845 mddev_unlock(mddev
);
5847 /* on success, candidates will be empty, on error
5850 rdev_for_each_list(rdev
, tmp
, &candidates
) {
5851 list_del_init(&rdev
->same_set
);
5856 pr_info("md: ... autorun DONE.\n");
5858 #endif /* !MODULE */
5860 static int get_version(void __user
*arg
)
5864 ver
.major
= MD_MAJOR_VERSION
;
5865 ver
.minor
= MD_MINOR_VERSION
;
5866 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
5868 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
5874 static int get_array_info(struct mddev
*mddev
, void __user
*arg
)
5876 mdu_array_info_t info
;
5877 int nr
,working
,insync
,failed
,spare
;
5878 struct md_rdev
*rdev
;
5880 nr
= working
= insync
= failed
= spare
= 0;
5882 rdev_for_each_rcu(rdev
, mddev
) {
5884 if (test_bit(Faulty
, &rdev
->flags
))
5888 if (test_bit(In_sync
, &rdev
->flags
))
5890 else if (test_bit(Journal
, &rdev
->flags
))
5891 /* TODO: add journal count to md_u.h */
5899 info
.major_version
= mddev
->major_version
;
5900 info
.minor_version
= mddev
->minor_version
;
5901 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
5902 info
.ctime
= clamp_t(time64_t
, mddev
->ctime
, 0, U32_MAX
);
5903 info
.level
= mddev
->level
;
5904 info
.size
= mddev
->dev_sectors
/ 2;
5905 if (info
.size
!= mddev
->dev_sectors
/ 2) /* overflow */
5908 info
.raid_disks
= mddev
->raid_disks
;
5909 info
.md_minor
= mddev
->md_minor
;
5910 info
.not_persistent
= !mddev
->persistent
;
5912 info
.utime
= clamp_t(time64_t
, mddev
->utime
, 0, U32_MAX
);
5915 info
.state
= (1<<MD_SB_CLEAN
);
5916 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
5917 info
.state
|= (1<<MD_SB_BITMAP_PRESENT
);
5918 if (mddev_is_clustered(mddev
))
5919 info
.state
|= (1<<MD_SB_CLUSTERED
);
5920 info
.active_disks
= insync
;
5921 info
.working_disks
= working
;
5922 info
.failed_disks
= failed
;
5923 info
.spare_disks
= spare
;
5925 info
.layout
= mddev
->layout
;
5926 info
.chunk_size
= mddev
->chunk_sectors
<< 9;
5928 if (copy_to_user(arg
, &info
, sizeof(info
)))
5934 static int get_bitmap_file(struct mddev
*mddev
, void __user
* arg
)
5936 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
5940 file
= kzalloc(sizeof(*file
), GFP_NOIO
);
5945 spin_lock(&mddev
->lock
);
5946 /* bitmap enabled */
5947 if (mddev
->bitmap_info
.file
) {
5948 ptr
= file_path(mddev
->bitmap_info
.file
, file
->pathname
,
5949 sizeof(file
->pathname
));
5953 memmove(file
->pathname
, ptr
,
5954 sizeof(file
->pathname
)-(ptr
-file
->pathname
));
5956 spin_unlock(&mddev
->lock
);
5959 copy_to_user(arg
, file
, sizeof(*file
)))
5966 static int get_disk_info(struct mddev
*mddev
, void __user
* arg
)
5968 mdu_disk_info_t info
;
5969 struct md_rdev
*rdev
;
5971 if (copy_from_user(&info
, arg
, sizeof(info
)))
5975 rdev
= md_find_rdev_nr_rcu(mddev
, info
.number
);
5977 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
5978 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
5979 info
.raid_disk
= rdev
->raid_disk
;
5981 if (test_bit(Faulty
, &rdev
->flags
))
5982 info
.state
|= (1<<MD_DISK_FAULTY
);
5983 else if (test_bit(In_sync
, &rdev
->flags
)) {
5984 info
.state
|= (1<<MD_DISK_ACTIVE
);
5985 info
.state
|= (1<<MD_DISK_SYNC
);
5987 if (test_bit(Journal
, &rdev
->flags
))
5988 info
.state
|= (1<<MD_DISK_JOURNAL
);
5989 if (test_bit(WriteMostly
, &rdev
->flags
))
5990 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
5991 if (test_bit(FailFast
, &rdev
->flags
))
5992 info
.state
|= (1<<MD_DISK_FAILFAST
);
5994 info
.major
= info
.minor
= 0;
5995 info
.raid_disk
= -1;
5996 info
.state
= (1<<MD_DISK_REMOVED
);
6000 if (copy_to_user(arg
, &info
, sizeof(info
)))
6006 static int add_new_disk(struct mddev
*mddev
, mdu_disk_info_t
*info
)
6008 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
6009 struct md_rdev
*rdev
;
6010 dev_t dev
= MKDEV(info
->major
,info
->minor
);
6012 if (mddev_is_clustered(mddev
) &&
6013 !(info
->state
& ((1 << MD_DISK_CLUSTER_ADD
) | (1 << MD_DISK_CANDIDATE
)))) {
6014 pr_warn("%s: Cannot add to clustered mddev.\n",
6019 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
6022 if (!mddev
->raid_disks
) {
6024 /* expecting a device which has a superblock */
6025 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
6027 pr_warn("md: md_import_device returned %ld\n",
6029 return PTR_ERR(rdev
);
6031 if (!list_empty(&mddev
->disks
)) {
6032 struct md_rdev
*rdev0
6033 = list_entry(mddev
->disks
.next
,
6034 struct md_rdev
, same_set
);
6035 err
= super_types
[mddev
->major_version
]
6036 .load_super(rdev
, rdev0
, mddev
->minor_version
);
6038 pr_warn("md: %s has different UUID to %s\n",
6039 bdevname(rdev
->bdev
,b
),
6040 bdevname(rdev0
->bdev
,b2
));
6045 err
= bind_rdev_to_array(rdev
, mddev
);
6052 * add_new_disk can be used once the array is assembled
6053 * to add "hot spares". They must already have a superblock
6058 if (!mddev
->pers
->hot_add_disk
) {
6059 pr_warn("%s: personality does not support diskops!\n",
6063 if (mddev
->persistent
)
6064 rdev
= md_import_device(dev
, mddev
->major_version
,
6065 mddev
->minor_version
);
6067 rdev
= md_import_device(dev
, -1, -1);
6069 pr_warn("md: md_import_device returned %ld\n",
6071 return PTR_ERR(rdev
);
6073 /* set saved_raid_disk if appropriate */
6074 if (!mddev
->persistent
) {
6075 if (info
->state
& (1<<MD_DISK_SYNC
) &&
6076 info
->raid_disk
< mddev
->raid_disks
) {
6077 rdev
->raid_disk
= info
->raid_disk
;
6078 set_bit(In_sync
, &rdev
->flags
);
6079 clear_bit(Bitmap_sync
, &rdev
->flags
);
6081 rdev
->raid_disk
= -1;
6082 rdev
->saved_raid_disk
= rdev
->raid_disk
;
6084 super_types
[mddev
->major_version
].
6085 validate_super(mddev
, rdev
);
6086 if ((info
->state
& (1<<MD_DISK_SYNC
)) &&
6087 rdev
->raid_disk
!= info
->raid_disk
) {
6088 /* This was a hot-add request, but events doesn't
6089 * match, so reject it.
6095 clear_bit(In_sync
, &rdev
->flags
); /* just to be sure */
6096 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
6097 set_bit(WriteMostly
, &rdev
->flags
);
6099 clear_bit(WriteMostly
, &rdev
->flags
);
6100 if (info
->state
& (1<<MD_DISK_FAILFAST
))
6101 set_bit(FailFast
, &rdev
->flags
);
6103 clear_bit(FailFast
, &rdev
->flags
);
6105 if (info
->state
& (1<<MD_DISK_JOURNAL
)) {
6106 struct md_rdev
*rdev2
;
6107 bool has_journal
= false;
6109 /* make sure no existing journal disk */
6110 rdev_for_each(rdev2
, mddev
) {
6111 if (test_bit(Journal
, &rdev2
->flags
)) {
6120 set_bit(Journal
, &rdev
->flags
);
6123 * check whether the device shows up in other nodes
6125 if (mddev_is_clustered(mddev
)) {
6126 if (info
->state
& (1 << MD_DISK_CANDIDATE
))
6127 set_bit(Candidate
, &rdev
->flags
);
6128 else if (info
->state
& (1 << MD_DISK_CLUSTER_ADD
)) {
6129 /* --add initiated by this node */
6130 err
= md_cluster_ops
->add_new_disk(mddev
, rdev
);
6138 rdev
->raid_disk
= -1;
6139 err
= bind_rdev_to_array(rdev
, mddev
);
6144 if (mddev_is_clustered(mddev
)) {
6145 if (info
->state
& (1 << MD_DISK_CANDIDATE
)) {
6147 err
= md_cluster_ops
->new_disk_ack(mddev
,
6150 md_kick_rdev_from_array(rdev
);
6154 md_cluster_ops
->add_new_disk_cancel(mddev
);
6156 err
= add_bound_rdev(rdev
);
6160 err
= add_bound_rdev(rdev
);
6165 /* otherwise, add_new_disk is only allowed
6166 * for major_version==0 superblocks
6168 if (mddev
->major_version
!= 0) {
6169 pr_warn("%s: ADD_NEW_DISK not supported\n", mdname(mddev
));
6173 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
6175 rdev
= md_import_device(dev
, -1, 0);
6177 pr_warn("md: error, md_import_device() returned %ld\n",
6179 return PTR_ERR(rdev
);
6181 rdev
->desc_nr
= info
->number
;
6182 if (info
->raid_disk
< mddev
->raid_disks
)
6183 rdev
->raid_disk
= info
->raid_disk
;
6185 rdev
->raid_disk
= -1;
6187 if (rdev
->raid_disk
< mddev
->raid_disks
)
6188 if (info
->state
& (1<<MD_DISK_SYNC
))
6189 set_bit(In_sync
, &rdev
->flags
);
6191 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
6192 set_bit(WriteMostly
, &rdev
->flags
);
6193 if (info
->state
& (1<<MD_DISK_FAILFAST
))
6194 set_bit(FailFast
, &rdev
->flags
);
6196 if (!mddev
->persistent
) {
6197 pr_debug("md: nonpersistent superblock ...\n");
6198 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
6200 rdev
->sb_start
= calc_dev_sboffset(rdev
);
6201 rdev
->sectors
= rdev
->sb_start
;
6203 err
= bind_rdev_to_array(rdev
, mddev
);
6213 static int hot_remove_disk(struct mddev
*mddev
, dev_t dev
)
6215 char b
[BDEVNAME_SIZE
];
6216 struct md_rdev
*rdev
;
6218 rdev
= find_rdev(mddev
, dev
);
6222 if (rdev
->raid_disk
< 0)
6225 clear_bit(Blocked
, &rdev
->flags
);
6226 remove_and_add_spares(mddev
, rdev
);
6228 if (rdev
->raid_disk
>= 0)
6232 if (mddev_is_clustered(mddev
))
6233 md_cluster_ops
->remove_disk(mddev
, rdev
);
6235 md_kick_rdev_from_array(rdev
);
6236 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
6238 md_wakeup_thread(mddev
->thread
);
6240 md_update_sb(mddev
, 1);
6241 md_new_event(mddev
);
6245 pr_debug("md: cannot remove active disk %s from %s ...\n",
6246 bdevname(rdev
->bdev
,b
), mdname(mddev
));
6250 static int hot_add_disk(struct mddev
*mddev
, dev_t dev
)
6252 char b
[BDEVNAME_SIZE
];
6254 struct md_rdev
*rdev
;
6259 if (mddev
->major_version
!= 0) {
6260 pr_warn("%s: HOT_ADD may only be used with version-0 superblocks.\n",
6264 if (!mddev
->pers
->hot_add_disk
) {
6265 pr_warn("%s: personality does not support diskops!\n",
6270 rdev
= md_import_device(dev
, -1, 0);
6272 pr_warn("md: error, md_import_device() returned %ld\n",
6277 if (mddev
->persistent
)
6278 rdev
->sb_start
= calc_dev_sboffset(rdev
);
6280 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
6282 rdev
->sectors
= rdev
->sb_start
;
6284 if (test_bit(Faulty
, &rdev
->flags
)) {
6285 pr_warn("md: can not hot-add faulty %s disk to %s!\n",
6286 bdevname(rdev
->bdev
,b
), mdname(mddev
));
6291 clear_bit(In_sync
, &rdev
->flags
);
6293 rdev
->saved_raid_disk
= -1;
6294 err
= bind_rdev_to_array(rdev
, mddev
);
6299 * The rest should better be atomic, we can have disk failures
6300 * noticed in interrupt contexts ...
6303 rdev
->raid_disk
= -1;
6305 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
6307 md_update_sb(mddev
, 1);
6309 * Kick recovery, maybe this spare has to be added to the
6310 * array immediately.
6312 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6313 md_wakeup_thread(mddev
->thread
);
6314 md_new_event(mddev
);
6322 static int set_bitmap_file(struct mddev
*mddev
, int fd
)
6327 if (!mddev
->pers
->quiesce
|| !mddev
->thread
)
6329 if (mddev
->recovery
|| mddev
->sync_thread
)
6331 /* we should be able to change the bitmap.. */
6335 struct inode
*inode
;
6338 if (mddev
->bitmap
|| mddev
->bitmap_info
.file
)
6339 return -EEXIST
; /* cannot add when bitmap is present */
6343 pr_warn("%s: error: failed to get bitmap file\n",
6348 inode
= f
->f_mapping
->host
;
6349 if (!S_ISREG(inode
->i_mode
)) {
6350 pr_warn("%s: error: bitmap file must be a regular file\n",
6353 } else if (!(f
->f_mode
& FMODE_WRITE
)) {
6354 pr_warn("%s: error: bitmap file must open for write\n",
6357 } else if (atomic_read(&inode
->i_writecount
) != 1) {
6358 pr_warn("%s: error: bitmap file is already in use\n",
6366 mddev
->bitmap_info
.file
= f
;
6367 mddev
->bitmap_info
.offset
= 0; /* file overrides offset */
6368 } else if (mddev
->bitmap
== NULL
)
6369 return -ENOENT
; /* cannot remove what isn't there */
6372 mddev
->pers
->quiesce(mddev
, 1);
6374 struct bitmap
*bitmap
;
6376 bitmap
= bitmap_create(mddev
, -1);
6377 if (!IS_ERR(bitmap
)) {
6378 mddev
->bitmap
= bitmap
;
6379 err
= bitmap_load(mddev
);
6381 err
= PTR_ERR(bitmap
);
6383 if (fd
< 0 || err
) {
6384 bitmap_destroy(mddev
);
6385 fd
= -1; /* make sure to put the file */
6387 mddev
->pers
->quiesce(mddev
, 0);
6390 struct file
*f
= mddev
->bitmap_info
.file
;
6392 spin_lock(&mddev
->lock
);
6393 mddev
->bitmap_info
.file
= NULL
;
6394 spin_unlock(&mddev
->lock
);
6403 * set_array_info is used two different ways
6404 * The original usage is when creating a new array.
6405 * In this usage, raid_disks is > 0 and it together with
6406 * level, size, not_persistent,layout,chunksize determine the
6407 * shape of the array.
6408 * This will always create an array with a type-0.90.0 superblock.
6409 * The newer usage is when assembling an array.
6410 * In this case raid_disks will be 0, and the major_version field is
6411 * use to determine which style super-blocks are to be found on the devices.
6412 * The minor and patch _version numbers are also kept incase the
6413 * super_block handler wishes to interpret them.
6415 static int set_array_info(struct mddev
*mddev
, mdu_array_info_t
*info
)
6418 if (info
->raid_disks
== 0) {
6419 /* just setting version number for superblock loading */
6420 if (info
->major_version
< 0 ||
6421 info
->major_version
>= ARRAY_SIZE(super_types
) ||
6422 super_types
[info
->major_version
].name
== NULL
) {
6423 /* maybe try to auto-load a module? */
6424 pr_warn("md: superblock version %d not known\n",
6425 info
->major_version
);
6428 mddev
->major_version
= info
->major_version
;
6429 mddev
->minor_version
= info
->minor_version
;
6430 mddev
->patch_version
= info
->patch_version
;
6431 mddev
->persistent
= !info
->not_persistent
;
6432 /* ensure mddev_put doesn't delete this now that there
6433 * is some minimal configuration.
6435 mddev
->ctime
= ktime_get_real_seconds();
6438 mddev
->major_version
= MD_MAJOR_VERSION
;
6439 mddev
->minor_version
= MD_MINOR_VERSION
;
6440 mddev
->patch_version
= MD_PATCHLEVEL_VERSION
;
6441 mddev
->ctime
= ktime_get_real_seconds();
6443 mddev
->level
= info
->level
;
6444 mddev
->clevel
[0] = 0;
6445 mddev
->dev_sectors
= 2 * (sector_t
)info
->size
;
6446 mddev
->raid_disks
= info
->raid_disks
;
6447 /* don't set md_minor, it is determined by which /dev/md* was
6450 if (info
->state
& (1<<MD_SB_CLEAN
))
6451 mddev
->recovery_cp
= MaxSector
;
6453 mddev
->recovery_cp
= 0;
6454 mddev
->persistent
= ! info
->not_persistent
;
6455 mddev
->external
= 0;
6457 mddev
->layout
= info
->layout
;
6458 mddev
->chunk_sectors
= info
->chunk_size
>> 9;
6460 mddev
->max_disks
= MD_SB_DISKS
;
6462 if (mddev
->persistent
) {
6464 mddev
->sb_flags
= 0;
6466 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
6468 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
6469 mddev
->bitmap_info
.default_space
= 64*2 - (MD_SB_BYTES
>> 9);
6470 mddev
->bitmap_info
.offset
= 0;
6472 mddev
->reshape_position
= MaxSector
;
6475 * Generate a 128 bit UUID
6477 get_random_bytes(mddev
->uuid
, 16);
6479 mddev
->new_level
= mddev
->level
;
6480 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
6481 mddev
->new_layout
= mddev
->layout
;
6482 mddev
->delta_disks
= 0;
6483 mddev
->reshape_backwards
= 0;
6488 void md_set_array_sectors(struct mddev
*mddev
, sector_t array_sectors
)
6490 WARN(!mddev_is_locked(mddev
), "%s: unlocked mddev!\n", __func__
);
6492 if (mddev
->external_size
)
6495 mddev
->array_sectors
= array_sectors
;
6497 EXPORT_SYMBOL(md_set_array_sectors
);
6499 static int update_size(struct mddev
*mddev
, sector_t num_sectors
)
6501 struct md_rdev
*rdev
;
6503 int fit
= (num_sectors
== 0);
6505 /* cluster raid doesn't support update size */
6506 if (mddev_is_clustered(mddev
))
6509 if (mddev
->pers
->resize
== NULL
)
6511 /* The "num_sectors" is the number of sectors of each device that
6512 * is used. This can only make sense for arrays with redundancy.
6513 * linear and raid0 always use whatever space is available. We can only
6514 * consider changing this number if no resync or reconstruction is
6515 * happening, and if the new size is acceptable. It must fit before the
6516 * sb_start or, if that is <data_offset, it must fit before the size
6517 * of each device. If num_sectors is zero, we find the largest size
6520 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
6526 rdev_for_each(rdev
, mddev
) {
6527 sector_t avail
= rdev
->sectors
;
6529 if (fit
&& (num_sectors
== 0 || num_sectors
> avail
))
6530 num_sectors
= avail
;
6531 if (avail
< num_sectors
)
6534 rv
= mddev
->pers
->resize(mddev
, num_sectors
);
6536 revalidate_disk(mddev
->gendisk
);
6540 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
)
6543 struct md_rdev
*rdev
;
6544 /* change the number of raid disks */
6545 if (mddev
->pers
->check_reshape
== NULL
)
6549 if (raid_disks
<= 0 ||
6550 (mddev
->max_disks
&& raid_disks
>= mddev
->max_disks
))
6552 if (mddev
->sync_thread
||
6553 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
6554 mddev
->reshape_position
!= MaxSector
)
6557 rdev_for_each(rdev
, mddev
) {
6558 if (mddev
->raid_disks
< raid_disks
&&
6559 rdev
->data_offset
< rdev
->new_data_offset
)
6561 if (mddev
->raid_disks
> raid_disks
&&
6562 rdev
->data_offset
> rdev
->new_data_offset
)
6566 mddev
->delta_disks
= raid_disks
- mddev
->raid_disks
;
6567 if (mddev
->delta_disks
< 0)
6568 mddev
->reshape_backwards
= 1;
6569 else if (mddev
->delta_disks
> 0)
6570 mddev
->reshape_backwards
= 0;
6572 rv
= mddev
->pers
->check_reshape(mddev
);
6574 mddev
->delta_disks
= 0;
6575 mddev
->reshape_backwards
= 0;
6581 * update_array_info is used to change the configuration of an
6583 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
6584 * fields in the info are checked against the array.
6585 * Any differences that cannot be handled will cause an error.
6586 * Normally, only one change can be managed at a time.
6588 static int update_array_info(struct mddev
*mddev
, mdu_array_info_t
*info
)
6594 /* calculate expected state,ignoring low bits */
6595 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
6596 state
|= (1 << MD_SB_BITMAP_PRESENT
);
6598 if (mddev
->major_version
!= info
->major_version
||
6599 mddev
->minor_version
!= info
->minor_version
||
6600 /* mddev->patch_version != info->patch_version || */
6601 mddev
->ctime
!= info
->ctime
||
6602 mddev
->level
!= info
->level
||
6603 /* mddev->layout != info->layout || */
6604 mddev
->persistent
!= !info
->not_persistent
||
6605 mddev
->chunk_sectors
!= info
->chunk_size
>> 9 ||
6606 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
6607 ((state
^info
->state
) & 0xfffffe00)
6610 /* Check there is only one change */
6611 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
6613 if (mddev
->raid_disks
!= info
->raid_disks
)
6615 if (mddev
->layout
!= info
->layout
)
6617 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
))
6624 if (mddev
->layout
!= info
->layout
) {
6626 * we don't need to do anything at the md level, the
6627 * personality will take care of it all.
6629 if (mddev
->pers
->check_reshape
== NULL
)
6632 mddev
->new_layout
= info
->layout
;
6633 rv
= mddev
->pers
->check_reshape(mddev
);
6635 mddev
->new_layout
= mddev
->layout
;
6639 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
6640 rv
= update_size(mddev
, (sector_t
)info
->size
* 2);
6642 if (mddev
->raid_disks
!= info
->raid_disks
)
6643 rv
= update_raid_disks(mddev
, info
->raid_disks
);
6645 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) {
6646 if (mddev
->pers
->quiesce
== NULL
|| mddev
->thread
== NULL
) {
6650 if (mddev
->recovery
|| mddev
->sync_thread
) {
6654 if (info
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
6655 struct bitmap
*bitmap
;
6656 /* add the bitmap */
6657 if (mddev
->bitmap
) {
6661 if (mddev
->bitmap_info
.default_offset
== 0) {
6665 mddev
->bitmap_info
.offset
=
6666 mddev
->bitmap_info
.default_offset
;
6667 mddev
->bitmap_info
.space
=
6668 mddev
->bitmap_info
.default_space
;
6669 mddev
->pers
->quiesce(mddev
, 1);
6670 bitmap
= bitmap_create(mddev
, -1);
6671 if (!IS_ERR(bitmap
)) {
6672 mddev
->bitmap
= bitmap
;
6673 rv
= bitmap_load(mddev
);
6675 rv
= PTR_ERR(bitmap
);
6677 bitmap_destroy(mddev
);
6678 mddev
->pers
->quiesce(mddev
, 0);
6680 /* remove the bitmap */
6681 if (!mddev
->bitmap
) {
6685 if (mddev
->bitmap
->storage
.file
) {
6689 if (mddev
->bitmap_info
.nodes
) {
6690 /* hold PW on all the bitmap lock */
6691 if (md_cluster_ops
->lock_all_bitmaps(mddev
) <= 0) {
6692 pr_warn("md: can't change bitmap to none since the array is in use by more than one node\n");
6694 md_cluster_ops
->unlock_all_bitmaps(mddev
);
6698 mddev
->bitmap_info
.nodes
= 0;
6699 md_cluster_ops
->leave(mddev
);
6701 mddev
->pers
->quiesce(mddev
, 1);
6702 bitmap_destroy(mddev
);
6703 mddev
->pers
->quiesce(mddev
, 0);
6704 mddev
->bitmap_info
.offset
= 0;
6707 md_update_sb(mddev
, 1);
6713 static int set_disk_faulty(struct mddev
*mddev
, dev_t dev
)
6715 struct md_rdev
*rdev
;
6718 if (mddev
->pers
== NULL
)
6722 rdev
= find_rdev_rcu(mddev
, dev
);
6726 md_error(mddev
, rdev
);
6727 if (!test_bit(Faulty
, &rdev
->flags
))
6735 * We have a problem here : there is no easy way to give a CHS
6736 * virtual geometry. We currently pretend that we have a 2 heads
6737 * 4 sectors (with a BIG number of cylinders...). This drives
6738 * dosfs just mad... ;-)
6740 static int md_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
6742 struct mddev
*mddev
= bdev
->bd_disk
->private_data
;
6746 geo
->cylinders
= mddev
->array_sectors
/ 8;
6750 static inline bool md_ioctl_valid(unsigned int cmd
)
6755 case GET_ARRAY_INFO
:
6756 case GET_BITMAP_FILE
:
6759 case HOT_REMOVE_DISK
:
6762 case RESTART_ARRAY_RW
:
6764 case SET_ARRAY_INFO
:
6765 case SET_BITMAP_FILE
:
6766 case SET_DISK_FAULTY
:
6769 case CLUSTERED_DISK_NACK
:
6776 static int md_ioctl(struct block_device
*bdev
, fmode_t mode
,
6777 unsigned int cmd
, unsigned long arg
)
6780 void __user
*argp
= (void __user
*)arg
;
6781 struct mddev
*mddev
= NULL
;
6784 if (!md_ioctl_valid(cmd
))
6789 case GET_ARRAY_INFO
:
6793 if (!capable(CAP_SYS_ADMIN
))
6798 * Commands dealing with the RAID driver but not any
6803 err
= get_version(argp
);
6809 autostart_arrays(arg
);
6816 * Commands creating/starting a new array:
6819 mddev
= bdev
->bd_disk
->private_data
;
6826 /* Some actions do not requires the mutex */
6828 case GET_ARRAY_INFO
:
6829 if (!mddev
->raid_disks
&& !mddev
->external
)
6832 err
= get_array_info(mddev
, argp
);
6836 if (!mddev
->raid_disks
&& !mddev
->external
)
6839 err
= get_disk_info(mddev
, argp
);
6842 case SET_DISK_FAULTY
:
6843 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
6846 case GET_BITMAP_FILE
:
6847 err
= get_bitmap_file(mddev
, argp
);
6852 if (cmd
== ADD_NEW_DISK
)
6853 /* need to ensure md_delayed_delete() has completed */
6854 flush_workqueue(md_misc_wq
);
6856 if (cmd
== HOT_REMOVE_DISK
)
6857 /* need to ensure recovery thread has run */
6858 wait_event_interruptible_timeout(mddev
->sb_wait
,
6859 !test_bit(MD_RECOVERY_NEEDED
,
6861 msecs_to_jiffies(5000));
6862 if (cmd
== STOP_ARRAY
|| cmd
== STOP_ARRAY_RO
) {
6863 /* Need to flush page cache, and ensure no-one else opens
6866 mutex_lock(&mddev
->open_mutex
);
6867 if (mddev
->pers
&& atomic_read(&mddev
->openers
) > 1) {
6868 mutex_unlock(&mddev
->open_mutex
);
6872 set_bit(MD_CLOSING
, &mddev
->flags
);
6873 mutex_unlock(&mddev
->open_mutex
);
6874 sync_blockdev(bdev
);
6876 err
= mddev_lock(mddev
);
6878 pr_debug("md: ioctl lock interrupted, reason %d, cmd %d\n",
6883 if (cmd
== SET_ARRAY_INFO
) {
6884 mdu_array_info_t info
;
6886 memset(&info
, 0, sizeof(info
));
6887 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
6892 err
= update_array_info(mddev
, &info
);
6894 pr_warn("md: couldn't update array info. %d\n", err
);
6899 if (!list_empty(&mddev
->disks
)) {
6900 pr_warn("md: array %s already has disks!\n", mdname(mddev
));
6904 if (mddev
->raid_disks
) {
6905 pr_warn("md: array %s already initialised!\n", mdname(mddev
));
6909 err
= set_array_info(mddev
, &info
);
6911 pr_warn("md: couldn't set array info. %d\n", err
);
6918 * Commands querying/configuring an existing array:
6920 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
6921 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
6922 if ((!mddev
->raid_disks
&& !mddev
->external
)
6923 && cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
6924 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
6925 && cmd
!= GET_BITMAP_FILE
) {
6931 * Commands even a read-only array can execute:
6934 case RESTART_ARRAY_RW
:
6935 err
= restart_array(mddev
);
6939 err
= do_md_stop(mddev
, 0, bdev
);
6943 err
= md_set_readonly(mddev
, bdev
);
6946 case HOT_REMOVE_DISK
:
6947 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
6951 /* We can support ADD_NEW_DISK on read-only arrays
6952 * only if we are re-adding a preexisting device.
6953 * So require mddev->pers and MD_DISK_SYNC.
6956 mdu_disk_info_t info
;
6957 if (copy_from_user(&info
, argp
, sizeof(info
)))
6959 else if (!(info
.state
& (1<<MD_DISK_SYNC
)))
6960 /* Need to clear read-only for this */
6963 err
= add_new_disk(mddev
, &info
);
6969 if (get_user(ro
, (int __user
*)(arg
))) {
6975 /* if the bdev is going readonly the value of mddev->ro
6976 * does not matter, no writes are coming
6981 /* are we are already prepared for writes? */
6985 /* transitioning to readauto need only happen for
6986 * arrays that call md_write_start
6989 err
= restart_array(mddev
);
6992 set_disk_ro(mddev
->gendisk
, 0);
6999 * The remaining ioctls are changing the state of the
7000 * superblock, so we do not allow them on read-only arrays.
7002 if (mddev
->ro
&& mddev
->pers
) {
7003 if (mddev
->ro
== 2) {
7005 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7006 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7007 /* mddev_unlock will wake thread */
7008 /* If a device failed while we were read-only, we
7009 * need to make sure the metadata is updated now.
7011 if (test_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
)) {
7012 mddev_unlock(mddev
);
7013 wait_event(mddev
->sb_wait
,
7014 !test_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
) &&
7015 !test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
));
7016 mddev_lock_nointr(mddev
);
7027 mdu_disk_info_t info
;
7028 if (copy_from_user(&info
, argp
, sizeof(info
)))
7031 err
= add_new_disk(mddev
, &info
);
7035 case CLUSTERED_DISK_NACK
:
7036 if (mddev_is_clustered(mddev
))
7037 md_cluster_ops
->new_disk_ack(mddev
, false);
7043 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
7047 err
= do_md_run(mddev
);
7050 case SET_BITMAP_FILE
:
7051 err
= set_bitmap_file(mddev
, (int)arg
);
7060 if (mddev
->hold_active
== UNTIL_IOCTL
&&
7062 mddev
->hold_active
= 0;
7063 mddev_unlock(mddev
);
7067 #ifdef CONFIG_COMPAT
7068 static int md_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
7069 unsigned int cmd
, unsigned long arg
)
7072 case HOT_REMOVE_DISK
:
7074 case SET_DISK_FAULTY
:
7075 case SET_BITMAP_FILE
:
7076 /* These take in integer arg, do not convert */
7079 arg
= (unsigned long)compat_ptr(arg
);
7083 return md_ioctl(bdev
, mode
, cmd
, arg
);
7085 #endif /* CONFIG_COMPAT */
7087 static int md_open(struct block_device
*bdev
, fmode_t mode
)
7090 * Succeed if we can lock the mddev, which confirms that
7091 * it isn't being stopped right now.
7093 struct mddev
*mddev
= mddev_find(bdev
->bd_dev
);
7099 if (mddev
->gendisk
!= bdev
->bd_disk
) {
7100 /* we are racing with mddev_put which is discarding this
7104 /* Wait until bdev->bd_disk is definitely gone */
7105 flush_workqueue(md_misc_wq
);
7106 /* Then retry the open from the top */
7107 return -ERESTARTSYS
;
7109 BUG_ON(mddev
!= bdev
->bd_disk
->private_data
);
7111 if ((err
= mutex_lock_interruptible(&mddev
->open_mutex
)))
7114 if (test_bit(MD_CLOSING
, &mddev
->flags
)) {
7115 mutex_unlock(&mddev
->open_mutex
);
7121 atomic_inc(&mddev
->openers
);
7122 mutex_unlock(&mddev
->open_mutex
);
7124 check_disk_change(bdev
);
7131 static void md_release(struct gendisk
*disk
, fmode_t mode
)
7133 struct mddev
*mddev
= disk
->private_data
;
7136 atomic_dec(&mddev
->openers
);
7140 static int md_media_changed(struct gendisk
*disk
)
7142 struct mddev
*mddev
= disk
->private_data
;
7144 return mddev
->changed
;
7147 static int md_revalidate(struct gendisk
*disk
)
7149 struct mddev
*mddev
= disk
->private_data
;
7154 static const struct block_device_operations md_fops
=
7156 .owner
= THIS_MODULE
,
7158 .release
= md_release
,
7160 #ifdef CONFIG_COMPAT
7161 .compat_ioctl
= md_compat_ioctl
,
7163 .getgeo
= md_getgeo
,
7164 .media_changed
= md_media_changed
,
7165 .revalidate_disk
= md_revalidate
,
7168 static int md_thread(void *arg
)
7170 struct md_thread
*thread
= arg
;
7173 * md_thread is a 'system-thread', it's priority should be very
7174 * high. We avoid resource deadlocks individually in each
7175 * raid personality. (RAID5 does preallocation) We also use RR and
7176 * the very same RT priority as kswapd, thus we will never get
7177 * into a priority inversion deadlock.
7179 * we definitely have to have equal or higher priority than
7180 * bdflush, otherwise bdflush will deadlock if there are too
7181 * many dirty RAID5 blocks.
7184 allow_signal(SIGKILL
);
7185 while (!kthread_should_stop()) {
7187 /* We need to wait INTERRUPTIBLE so that
7188 * we don't add to the load-average.
7189 * That means we need to be sure no signals are
7192 if (signal_pending(current
))
7193 flush_signals(current
);
7195 wait_event_interruptible_timeout
7197 test_bit(THREAD_WAKEUP
, &thread
->flags
)
7198 || kthread_should_stop() || kthread_should_park(),
7201 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
7202 if (kthread_should_park())
7204 if (!kthread_should_stop())
7205 thread
->run(thread
);
7211 void md_wakeup_thread(struct md_thread
*thread
)
7214 pr_debug("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
7215 set_bit(THREAD_WAKEUP
, &thread
->flags
);
7216 wake_up(&thread
->wqueue
);
7219 EXPORT_SYMBOL(md_wakeup_thread
);
7221 struct md_thread
*md_register_thread(void (*run
) (struct md_thread
*),
7222 struct mddev
*mddev
, const char *name
)
7224 struct md_thread
*thread
;
7226 thread
= kzalloc(sizeof(struct md_thread
), GFP_KERNEL
);
7230 init_waitqueue_head(&thread
->wqueue
);
7233 thread
->mddev
= mddev
;
7234 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
7235 thread
->tsk
= kthread_run(md_thread
, thread
,
7237 mdname(thread
->mddev
),
7239 if (IS_ERR(thread
->tsk
)) {
7245 EXPORT_SYMBOL(md_register_thread
);
7247 void md_unregister_thread(struct md_thread
**threadp
)
7249 struct md_thread
*thread
= *threadp
;
7252 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread
->tsk
));
7253 /* Locking ensures that mddev_unlock does not wake_up a
7254 * non-existent thread
7256 spin_lock(&pers_lock
);
7258 spin_unlock(&pers_lock
);
7260 kthread_stop(thread
->tsk
);
7263 EXPORT_SYMBOL(md_unregister_thread
);
7265 void md_error(struct mddev
*mddev
, struct md_rdev
*rdev
)
7267 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
7270 if (!mddev
->pers
|| !mddev
->pers
->error_handler
)
7272 mddev
->pers
->error_handler(mddev
,rdev
);
7273 if (mddev
->degraded
)
7274 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7275 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
7276 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7277 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7278 md_wakeup_thread(mddev
->thread
);
7279 if (mddev
->event_work
.func
)
7280 queue_work(md_misc_wq
, &mddev
->event_work
);
7281 md_new_event(mddev
);
7283 EXPORT_SYMBOL(md_error
);
7285 /* seq_file implementation /proc/mdstat */
7287 static void status_unused(struct seq_file
*seq
)
7290 struct md_rdev
*rdev
;
7292 seq_printf(seq
, "unused devices: ");
7294 list_for_each_entry(rdev
, &pending_raid_disks
, same_set
) {
7295 char b
[BDEVNAME_SIZE
];
7297 seq_printf(seq
, "%s ",
7298 bdevname(rdev
->bdev
,b
));
7301 seq_printf(seq
, "<none>");
7303 seq_printf(seq
, "\n");
7306 static int status_resync(struct seq_file
*seq
, struct mddev
*mddev
)
7308 sector_t max_sectors
, resync
, res
;
7309 unsigned long dt
, db
;
7312 unsigned int per_milli
;
7314 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
7315 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
7316 max_sectors
= mddev
->resync_max_sectors
;
7318 max_sectors
= mddev
->dev_sectors
;
7320 resync
= mddev
->curr_resync
;
7322 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
7323 /* Still cleaning up */
7324 resync
= max_sectors
;
7326 resync
-= atomic_read(&mddev
->recovery_active
);
7329 if (mddev
->recovery_cp
< MaxSector
) {
7330 seq_printf(seq
, "\tresync=PENDING");
7336 seq_printf(seq
, "\tresync=DELAYED");
7340 WARN_ON(max_sectors
== 0);
7341 /* Pick 'scale' such that (resync>>scale)*1000 will fit
7342 * in a sector_t, and (max_sectors>>scale) will fit in a
7343 * u32, as those are the requirements for sector_div.
7344 * Thus 'scale' must be at least 10
7347 if (sizeof(sector_t
) > sizeof(unsigned long)) {
7348 while ( max_sectors
/2 > (1ULL<<(scale
+32)))
7351 res
= (resync
>>scale
)*1000;
7352 sector_div(res
, (u32
)((max_sectors
>>scale
)+1));
7356 int i
, x
= per_milli
/50, y
= 20-x
;
7357 seq_printf(seq
, "[");
7358 for (i
= 0; i
< x
; i
++)
7359 seq_printf(seq
, "=");
7360 seq_printf(seq
, ">");
7361 for (i
= 0; i
< y
; i
++)
7362 seq_printf(seq
, ".");
7363 seq_printf(seq
, "] ");
7365 seq_printf(seq
, " %s =%3u.%u%% (%llu/%llu)",
7366 (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)?
7368 (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)?
7370 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
7371 "resync" : "recovery"))),
7372 per_milli
/10, per_milli
% 10,
7373 (unsigned long long) resync
/2,
7374 (unsigned long long) max_sectors
/2);
7377 * dt: time from mark until now
7378 * db: blocks written from mark until now
7379 * rt: remaining time
7381 * rt is a sector_t, so could be 32bit or 64bit.
7382 * So we divide before multiply in case it is 32bit and close
7384 * We scale the divisor (db) by 32 to avoid losing precision
7385 * near the end of resync when the number of remaining sectors
7387 * We then divide rt by 32 after multiplying by db to compensate.
7388 * The '+1' avoids division by zero if db is very small.
7390 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
7392 db
= (mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
))
7393 - mddev
->resync_mark_cnt
;
7395 rt
= max_sectors
- resync
; /* number of remaining sectors */
7396 sector_div(rt
, db
/32+1);
7400 seq_printf(seq
, " finish=%lu.%lumin", (unsigned long)rt
/ 60,
7401 ((unsigned long)rt
% 60)/6);
7403 seq_printf(seq
, " speed=%ldK/sec", db
/2/dt
);
7407 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
7409 struct list_head
*tmp
;
7411 struct mddev
*mddev
;
7419 spin_lock(&all_mddevs_lock
);
7420 list_for_each(tmp
,&all_mddevs
)
7422 mddev
= list_entry(tmp
, struct mddev
, all_mddevs
);
7424 spin_unlock(&all_mddevs_lock
);
7427 spin_unlock(&all_mddevs_lock
);
7429 return (void*)2;/* tail */
7433 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
7435 struct list_head
*tmp
;
7436 struct mddev
*next_mddev
, *mddev
= v
;
7442 spin_lock(&all_mddevs_lock
);
7444 tmp
= all_mddevs
.next
;
7446 tmp
= mddev
->all_mddevs
.next
;
7447 if (tmp
!= &all_mddevs
)
7448 next_mddev
= mddev_get(list_entry(tmp
,struct mddev
,all_mddevs
));
7450 next_mddev
= (void*)2;
7453 spin_unlock(&all_mddevs_lock
);
7461 static void md_seq_stop(struct seq_file
*seq
, void *v
)
7463 struct mddev
*mddev
= v
;
7465 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
7469 static int md_seq_show(struct seq_file
*seq
, void *v
)
7471 struct mddev
*mddev
= v
;
7473 struct md_rdev
*rdev
;
7475 if (v
== (void*)1) {
7476 struct md_personality
*pers
;
7477 seq_printf(seq
, "Personalities : ");
7478 spin_lock(&pers_lock
);
7479 list_for_each_entry(pers
, &pers_list
, list
)
7480 seq_printf(seq
, "[%s] ", pers
->name
);
7482 spin_unlock(&pers_lock
);
7483 seq_printf(seq
, "\n");
7484 seq
->poll_event
= atomic_read(&md_event_count
);
7487 if (v
== (void*)2) {
7492 spin_lock(&mddev
->lock
);
7493 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
7494 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
7495 mddev
->pers
? "" : "in");
7498 seq_printf(seq
, " (read-only)");
7500 seq_printf(seq
, " (auto-read-only)");
7501 seq_printf(seq
, " %s", mddev
->pers
->name
);
7506 rdev_for_each_rcu(rdev
, mddev
) {
7507 char b
[BDEVNAME_SIZE
];
7508 seq_printf(seq
, " %s[%d]",
7509 bdevname(rdev
->bdev
,b
), rdev
->desc_nr
);
7510 if (test_bit(WriteMostly
, &rdev
->flags
))
7511 seq_printf(seq
, "(W)");
7512 if (test_bit(Journal
, &rdev
->flags
))
7513 seq_printf(seq
, "(J)");
7514 if (test_bit(Faulty
, &rdev
->flags
)) {
7515 seq_printf(seq
, "(F)");
7518 if (rdev
->raid_disk
< 0)
7519 seq_printf(seq
, "(S)"); /* spare */
7520 if (test_bit(Replacement
, &rdev
->flags
))
7521 seq_printf(seq
, "(R)");
7522 sectors
+= rdev
->sectors
;
7526 if (!list_empty(&mddev
->disks
)) {
7528 seq_printf(seq
, "\n %llu blocks",
7529 (unsigned long long)
7530 mddev
->array_sectors
/ 2);
7532 seq_printf(seq
, "\n %llu blocks",
7533 (unsigned long long)sectors
/ 2);
7535 if (mddev
->persistent
) {
7536 if (mddev
->major_version
!= 0 ||
7537 mddev
->minor_version
!= 90) {
7538 seq_printf(seq
," super %d.%d",
7539 mddev
->major_version
,
7540 mddev
->minor_version
);
7542 } else if (mddev
->external
)
7543 seq_printf(seq
, " super external:%s",
7544 mddev
->metadata_type
);
7546 seq_printf(seq
, " super non-persistent");
7549 mddev
->pers
->status(seq
, mddev
);
7550 seq_printf(seq
, "\n ");
7551 if (mddev
->pers
->sync_request
) {
7552 if (status_resync(seq
, mddev
))
7553 seq_printf(seq
, "\n ");
7556 seq_printf(seq
, "\n ");
7558 bitmap_status(seq
, mddev
->bitmap
);
7560 seq_printf(seq
, "\n");
7562 spin_unlock(&mddev
->lock
);
7567 static const struct seq_operations md_seq_ops
= {
7568 .start
= md_seq_start
,
7569 .next
= md_seq_next
,
7570 .stop
= md_seq_stop
,
7571 .show
= md_seq_show
,
7574 static int md_seq_open(struct inode
*inode
, struct file
*file
)
7576 struct seq_file
*seq
;
7579 error
= seq_open(file
, &md_seq_ops
);
7583 seq
= file
->private_data
;
7584 seq
->poll_event
= atomic_read(&md_event_count
);
7588 static int md_unloading
;
7589 static unsigned int mdstat_poll(struct file
*filp
, poll_table
*wait
)
7591 struct seq_file
*seq
= filp
->private_data
;
7595 return POLLIN
|POLLRDNORM
|POLLERR
|POLLPRI
;
7596 poll_wait(filp
, &md_event_waiters
, wait
);
7598 /* always allow read */
7599 mask
= POLLIN
| POLLRDNORM
;
7601 if (seq
->poll_event
!= atomic_read(&md_event_count
))
7602 mask
|= POLLERR
| POLLPRI
;
7606 static const struct file_operations md_seq_fops
= {
7607 .owner
= THIS_MODULE
,
7608 .open
= md_seq_open
,
7610 .llseek
= seq_lseek
,
7611 .release
= seq_release_private
,
7612 .poll
= mdstat_poll
,
7615 int register_md_personality(struct md_personality
*p
)
7617 pr_debug("md: %s personality registered for level %d\n",
7619 spin_lock(&pers_lock
);
7620 list_add_tail(&p
->list
, &pers_list
);
7621 spin_unlock(&pers_lock
);
7624 EXPORT_SYMBOL(register_md_personality
);
7626 int unregister_md_personality(struct md_personality
*p
)
7628 pr_debug("md: %s personality unregistered\n", p
->name
);
7629 spin_lock(&pers_lock
);
7630 list_del_init(&p
->list
);
7631 spin_unlock(&pers_lock
);
7634 EXPORT_SYMBOL(unregister_md_personality
);
7636 int register_md_cluster_operations(struct md_cluster_operations
*ops
,
7637 struct module
*module
)
7640 spin_lock(&pers_lock
);
7641 if (md_cluster_ops
!= NULL
)
7644 md_cluster_ops
= ops
;
7645 md_cluster_mod
= module
;
7647 spin_unlock(&pers_lock
);
7650 EXPORT_SYMBOL(register_md_cluster_operations
);
7652 int unregister_md_cluster_operations(void)
7654 spin_lock(&pers_lock
);
7655 md_cluster_ops
= NULL
;
7656 spin_unlock(&pers_lock
);
7659 EXPORT_SYMBOL(unregister_md_cluster_operations
);
7661 int md_setup_cluster(struct mddev
*mddev
, int nodes
)
7663 if (!md_cluster_ops
)
7664 request_module("md-cluster");
7665 spin_lock(&pers_lock
);
7666 /* ensure module won't be unloaded */
7667 if (!md_cluster_ops
|| !try_module_get(md_cluster_mod
)) {
7668 pr_warn("can't find md-cluster module or get it's reference.\n");
7669 spin_unlock(&pers_lock
);
7672 spin_unlock(&pers_lock
);
7674 return md_cluster_ops
->join(mddev
, nodes
);
7677 void md_cluster_stop(struct mddev
*mddev
)
7679 if (!md_cluster_ops
)
7681 md_cluster_ops
->leave(mddev
);
7682 module_put(md_cluster_mod
);
7685 static int is_mddev_idle(struct mddev
*mddev
, int init
)
7687 struct md_rdev
*rdev
;
7693 rdev_for_each_rcu(rdev
, mddev
) {
7694 struct gendisk
*disk
= rdev
->bdev
->bd_contains
->bd_disk
;
7695 curr_events
= (int)part_stat_read(&disk
->part0
, sectors
[0]) +
7696 (int)part_stat_read(&disk
->part0
, sectors
[1]) -
7697 atomic_read(&disk
->sync_io
);
7698 /* sync IO will cause sync_io to increase before the disk_stats
7699 * as sync_io is counted when a request starts, and
7700 * disk_stats is counted when it completes.
7701 * So resync activity will cause curr_events to be smaller than
7702 * when there was no such activity.
7703 * non-sync IO will cause disk_stat to increase without
7704 * increasing sync_io so curr_events will (eventually)
7705 * be larger than it was before. Once it becomes
7706 * substantially larger, the test below will cause
7707 * the array to appear non-idle, and resync will slow
7709 * If there is a lot of outstanding resync activity when
7710 * we set last_event to curr_events, then all that activity
7711 * completing might cause the array to appear non-idle
7712 * and resync will be slowed down even though there might
7713 * not have been non-resync activity. This will only
7714 * happen once though. 'last_events' will soon reflect
7715 * the state where there is little or no outstanding
7716 * resync requests, and further resync activity will
7717 * always make curr_events less than last_events.
7720 if (init
|| curr_events
- rdev
->last_events
> 64) {
7721 rdev
->last_events
= curr_events
;
7729 void md_done_sync(struct mddev
*mddev
, int blocks
, int ok
)
7731 /* another "blocks" (512byte) blocks have been synced */
7732 atomic_sub(blocks
, &mddev
->recovery_active
);
7733 wake_up(&mddev
->recovery_wait
);
7735 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7736 set_bit(MD_RECOVERY_ERROR
, &mddev
->recovery
);
7737 md_wakeup_thread(mddev
->thread
);
7738 // stop recovery, signal do_sync ....
7741 EXPORT_SYMBOL(md_done_sync
);
7743 /* md_write_start(mddev, bi)
7744 * If we need to update some array metadata (e.g. 'active' flag
7745 * in superblock) before writing, schedule a superblock update
7746 * and wait for it to complete.
7748 void md_write_start(struct mddev
*mddev
, struct bio
*bi
)
7751 if (bio_data_dir(bi
) != WRITE
)
7754 BUG_ON(mddev
->ro
== 1);
7755 if (mddev
->ro
== 2) {
7756 /* need to switch to read/write */
7758 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7759 md_wakeup_thread(mddev
->thread
);
7760 md_wakeup_thread(mddev
->sync_thread
);
7763 atomic_inc(&mddev
->writes_pending
);
7764 if (mddev
->safemode
== 1)
7765 mddev
->safemode
= 0;
7766 if (mddev
->in_sync
) {
7767 spin_lock(&mddev
->lock
);
7768 if (mddev
->in_sync
) {
7770 set_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
7771 set_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
7772 md_wakeup_thread(mddev
->thread
);
7775 spin_unlock(&mddev
->lock
);
7778 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7779 wait_event(mddev
->sb_wait
,
7780 !test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
));
7782 EXPORT_SYMBOL(md_write_start
);
7784 void md_write_end(struct mddev
*mddev
)
7786 if (atomic_dec_and_test(&mddev
->writes_pending
)) {
7787 if (mddev
->safemode
== 2)
7788 md_wakeup_thread(mddev
->thread
);
7789 else if (mddev
->safemode_delay
)
7790 mod_timer(&mddev
->safemode_timer
, jiffies
+ mddev
->safemode_delay
);
7793 EXPORT_SYMBOL(md_write_end
);
7795 /* md_allow_write(mddev)
7796 * Calling this ensures that the array is marked 'active' so that writes
7797 * may proceed without blocking. It is important to call this before
7798 * attempting a GFP_KERNEL allocation while holding the mddev lock.
7799 * Must be called with mddev_lock held.
7801 * In the ->external case MD_SB_CHANGE_PENDING can not be cleared until mddev->lock
7802 * is dropped, so return -EAGAIN after notifying userspace.
7804 int md_allow_write(struct mddev
*mddev
)
7810 if (!mddev
->pers
->sync_request
)
7813 spin_lock(&mddev
->lock
);
7814 if (mddev
->in_sync
) {
7816 set_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
7817 set_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
7818 if (mddev
->safemode_delay
&&
7819 mddev
->safemode
== 0)
7820 mddev
->safemode
= 1;
7821 spin_unlock(&mddev
->lock
);
7822 md_update_sb(mddev
, 0);
7823 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7825 spin_unlock(&mddev
->lock
);
7827 if (test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
))
7832 EXPORT_SYMBOL_GPL(md_allow_write
);
7834 #define SYNC_MARKS 10
7835 #define SYNC_MARK_STEP (3*HZ)
7836 #define UPDATE_FREQUENCY (5*60*HZ)
7837 void md_do_sync(struct md_thread
*thread
)
7839 struct mddev
*mddev
= thread
->mddev
;
7840 struct mddev
*mddev2
;
7841 unsigned int currspeed
= 0,
7843 sector_t max_sectors
,j
, io_sectors
, recovery_done
;
7844 unsigned long mark
[SYNC_MARKS
];
7845 unsigned long update_time
;
7846 sector_t mark_cnt
[SYNC_MARKS
];
7848 struct list_head
*tmp
;
7849 sector_t last_check
;
7851 struct md_rdev
*rdev
;
7852 char *desc
, *action
= NULL
;
7853 struct blk_plug plug
;
7856 /* just incase thread restarts... */
7857 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
7859 if (mddev
->ro
) {/* never try to sync a read-only array */
7860 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7864 if (mddev_is_clustered(mddev
)) {
7865 ret
= md_cluster_ops
->resync_start(mddev
);
7869 set_bit(MD_CLUSTER_RESYNC_LOCKED
, &mddev
->flags
);
7870 if (!(test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
7871 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) ||
7872 test_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
))
7873 && ((unsigned long long)mddev
->curr_resync_completed
7874 < (unsigned long long)mddev
->resync_max_sectors
))
7878 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7879 if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)) {
7880 desc
= "data-check";
7882 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
7883 desc
= "requested-resync";
7887 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
7892 mddev
->last_sync_action
= action
?: desc
;
7894 /* we overload curr_resync somewhat here.
7895 * 0 == not engaged in resync at all
7896 * 2 == checking that there is no conflict with another sync
7897 * 1 == like 2, but have yielded to allow conflicting resync to
7899 * other == active in resync - this many blocks
7901 * Before starting a resync we must have set curr_resync to
7902 * 2, and then checked that every "conflicting" array has curr_resync
7903 * less than ours. When we find one that is the same or higher
7904 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
7905 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
7906 * This will mean we have to start checking from the beginning again.
7911 int mddev2_minor
= -1;
7912 mddev
->curr_resync
= 2;
7915 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7917 for_each_mddev(mddev2
, tmp
) {
7918 if (mddev2
== mddev
)
7920 if (!mddev
->parallel_resync
7921 && mddev2
->curr_resync
7922 && match_mddev_units(mddev
, mddev2
)) {
7924 if (mddev
< mddev2
&& mddev
->curr_resync
== 2) {
7925 /* arbitrarily yield */
7926 mddev
->curr_resync
= 1;
7927 wake_up(&resync_wait
);
7929 if (mddev
> mddev2
&& mddev
->curr_resync
== 1)
7930 /* no need to wait here, we can wait the next
7931 * time 'round when curr_resync == 2
7934 /* We need to wait 'interruptible' so as not to
7935 * contribute to the load average, and not to
7936 * be caught by 'softlockup'
7938 prepare_to_wait(&resync_wait
, &wq
, TASK_INTERRUPTIBLE
);
7939 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
7940 mddev2
->curr_resync
>= mddev
->curr_resync
) {
7941 if (mddev2_minor
!= mddev2
->md_minor
) {
7942 mddev2_minor
= mddev2
->md_minor
;
7943 pr_info("md: delaying %s of %s until %s has finished (they share one or more physical units)\n",
7944 desc
, mdname(mddev
),
7948 if (signal_pending(current
))
7949 flush_signals(current
);
7951 finish_wait(&resync_wait
, &wq
);
7954 finish_wait(&resync_wait
, &wq
);
7957 } while (mddev
->curr_resync
< 2);
7960 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7961 /* resync follows the size requested by the personality,
7962 * which defaults to physical size, but can be virtual size
7964 max_sectors
= mddev
->resync_max_sectors
;
7965 atomic64_set(&mddev
->resync_mismatches
, 0);
7966 /* we don't use the checkpoint if there's a bitmap */
7967 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7968 j
= mddev
->resync_min
;
7969 else if (!mddev
->bitmap
)
7970 j
= mddev
->recovery_cp
;
7972 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
7973 max_sectors
= mddev
->resync_max_sectors
;
7975 /* recovery follows the physical size of devices */
7976 max_sectors
= mddev
->dev_sectors
;
7979 rdev_for_each_rcu(rdev
, mddev
)
7980 if (rdev
->raid_disk
>= 0 &&
7981 !test_bit(Journal
, &rdev
->flags
) &&
7982 !test_bit(Faulty
, &rdev
->flags
) &&
7983 !test_bit(In_sync
, &rdev
->flags
) &&
7984 rdev
->recovery_offset
< j
)
7985 j
= rdev
->recovery_offset
;
7988 /* If there is a bitmap, we need to make sure all
7989 * writes that started before we added a spare
7990 * complete before we start doing a recovery.
7991 * Otherwise the write might complete and (via
7992 * bitmap_endwrite) set a bit in the bitmap after the
7993 * recovery has checked that bit and skipped that
7996 if (mddev
->bitmap
) {
7997 mddev
->pers
->quiesce(mddev
, 1);
7998 mddev
->pers
->quiesce(mddev
, 0);
8002 pr_info("md: %s of RAID array %s\n", desc
, mdname(mddev
));
8003 pr_debug("md: minimum _guaranteed_ speed: %d KB/sec/disk.\n", speed_min(mddev
));
8004 pr_debug("md: using maximum available idle IO bandwidth (but not more than %d KB/sec) for %s.\n",
8005 speed_max(mddev
), desc
);
8007 is_mddev_idle(mddev
, 1); /* this initializes IO event counters */
8010 for (m
= 0; m
< SYNC_MARKS
; m
++) {
8012 mark_cnt
[m
] = io_sectors
;
8015 mddev
->resync_mark
= mark
[last_mark
];
8016 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
8019 * Tune reconstruction:
8021 window
= 32*(PAGE_SIZE
/512);
8022 pr_debug("md: using %dk window, over a total of %lluk.\n",
8023 window
/2, (unsigned long long)max_sectors
/2);
8025 atomic_set(&mddev
->recovery_active
, 0);
8029 pr_debug("md: resuming %s of %s from checkpoint.\n",
8030 desc
, mdname(mddev
));
8031 mddev
->curr_resync
= j
;
8033 mddev
->curr_resync
= 3; /* no longer delayed */
8034 mddev
->curr_resync_completed
= j
;
8035 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
8036 md_new_event(mddev
);
8037 update_time
= jiffies
;
8039 blk_start_plug(&plug
);
8040 while (j
< max_sectors
) {
8045 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
8046 ((mddev
->curr_resync
> mddev
->curr_resync_completed
&&
8047 (mddev
->curr_resync
- mddev
->curr_resync_completed
)
8048 > (max_sectors
>> 4)) ||
8049 time_after_eq(jiffies
, update_time
+ UPDATE_FREQUENCY
) ||
8050 (j
- mddev
->curr_resync_completed
)*2
8051 >= mddev
->resync_max
- mddev
->curr_resync_completed
||
8052 mddev
->curr_resync_completed
> mddev
->resync_max
8054 /* time to update curr_resync_completed */
8055 wait_event(mddev
->recovery_wait
,
8056 atomic_read(&mddev
->recovery_active
) == 0);
8057 mddev
->curr_resync_completed
= j
;
8058 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) &&
8059 j
> mddev
->recovery_cp
)
8060 mddev
->recovery_cp
= j
;
8061 update_time
= jiffies
;
8062 set_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
8063 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
8066 while (j
>= mddev
->resync_max
&&
8067 !test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
8068 /* As this condition is controlled by user-space,
8069 * we can block indefinitely, so use '_interruptible'
8070 * to avoid triggering warnings.
8072 flush_signals(current
); /* just in case */
8073 wait_event_interruptible(mddev
->recovery_wait
,
8074 mddev
->resync_max
> j
8075 || test_bit(MD_RECOVERY_INTR
,
8079 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
8082 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
);
8084 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8088 if (!skipped
) { /* actual IO requested */
8089 io_sectors
+= sectors
;
8090 atomic_add(sectors
, &mddev
->recovery_active
);
8093 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
8097 if (j
> max_sectors
)
8098 /* when skipping, extra large numbers can be returned. */
8101 mddev
->curr_resync
= j
;
8102 mddev
->curr_mark_cnt
= io_sectors
;
8103 if (last_check
== 0)
8104 /* this is the earliest that rebuild will be
8105 * visible in /proc/mdstat
8107 md_new_event(mddev
);
8109 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
8112 last_check
= io_sectors
;
8114 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
8116 int next
= (last_mark
+1) % SYNC_MARKS
;
8118 mddev
->resync_mark
= mark
[next
];
8119 mddev
->resync_mark_cnt
= mark_cnt
[next
];
8120 mark
[next
] = jiffies
;
8121 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
8125 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
8129 * this loop exits only if either when we are slower than
8130 * the 'hard' speed limit, or the system was IO-idle for
8132 * the system might be non-idle CPU-wise, but we only care
8133 * about not overloading the IO subsystem. (things like an
8134 * e2fsck being done on the RAID array should execute fast)
8138 recovery_done
= io_sectors
- atomic_read(&mddev
->recovery_active
);
8139 currspeed
= ((unsigned long)(recovery_done
- mddev
->resync_mark_cnt
))/2
8140 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
8142 if (currspeed
> speed_min(mddev
)) {
8143 if (currspeed
> speed_max(mddev
)) {
8147 if (!is_mddev_idle(mddev
, 0)) {
8149 * Give other IO more of a chance.
8150 * The faster the devices, the less we wait.
8152 wait_event(mddev
->recovery_wait
,
8153 !atomic_read(&mddev
->recovery_active
));
8157 pr_info("md: %s: %s %s.\n",mdname(mddev
), desc
,
8158 test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)
8159 ? "interrupted" : "done");
8161 * this also signals 'finished resyncing' to md_stop
8163 blk_finish_plug(&plug
);
8164 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
8166 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
8167 !test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
8168 mddev
->curr_resync
> 3) {
8169 mddev
->curr_resync_completed
= mddev
->curr_resync
;
8170 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
8172 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
);
8174 if (!test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
) &&
8175 mddev
->curr_resync
> 3) {
8176 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
8177 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
8178 if (mddev
->curr_resync
>= mddev
->recovery_cp
) {
8179 pr_debug("md: checkpointing %s of %s.\n",
8180 desc
, mdname(mddev
));
8181 if (test_bit(MD_RECOVERY_ERROR
,
8183 mddev
->recovery_cp
=
8184 mddev
->curr_resync_completed
;
8186 mddev
->recovery_cp
=
8190 mddev
->recovery_cp
= MaxSector
;
8192 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
8193 mddev
->curr_resync
= MaxSector
;
8195 rdev_for_each_rcu(rdev
, mddev
)
8196 if (rdev
->raid_disk
>= 0 &&
8197 mddev
->delta_disks
>= 0 &&
8198 !test_bit(Journal
, &rdev
->flags
) &&
8199 !test_bit(Faulty
, &rdev
->flags
) &&
8200 !test_bit(In_sync
, &rdev
->flags
) &&
8201 rdev
->recovery_offset
< mddev
->curr_resync
)
8202 rdev
->recovery_offset
= mddev
->curr_resync
;
8207 /* set CHANGE_PENDING here since maybe another update is needed,
8208 * so other nodes are informed. It should be harmless for normal
8210 set_mask_bits(&mddev
->sb_flags
, 0,
8211 BIT(MD_SB_CHANGE_PENDING
) | BIT(MD_SB_CHANGE_DEVS
));
8213 spin_lock(&mddev
->lock
);
8214 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
8215 /* We completed so min/max setting can be forgotten if used. */
8216 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
8217 mddev
->resync_min
= 0;
8218 mddev
->resync_max
= MaxSector
;
8219 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
8220 mddev
->resync_min
= mddev
->curr_resync_completed
;
8221 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
8222 mddev
->curr_resync
= 0;
8223 spin_unlock(&mddev
->lock
);
8225 wake_up(&resync_wait
);
8226 md_wakeup_thread(mddev
->thread
);
8229 EXPORT_SYMBOL_GPL(md_do_sync
);
8231 static int remove_and_add_spares(struct mddev
*mddev
,
8232 struct md_rdev
*this)
8234 struct md_rdev
*rdev
;
8237 bool remove_some
= false;
8239 rdev_for_each(rdev
, mddev
) {
8240 if ((this == NULL
|| rdev
== this) &&
8241 rdev
->raid_disk
>= 0 &&
8242 !test_bit(Blocked
, &rdev
->flags
) &&
8243 test_bit(Faulty
, &rdev
->flags
) &&
8244 atomic_read(&rdev
->nr_pending
)==0) {
8245 /* Faulty non-Blocked devices with nr_pending == 0
8246 * never get nr_pending incremented,
8247 * never get Faulty cleared, and never get Blocked set.
8248 * So we can synchronize_rcu now rather than once per device
8251 set_bit(RemoveSynchronized
, &rdev
->flags
);
8257 rdev_for_each(rdev
, mddev
) {
8258 if ((this == NULL
|| rdev
== this) &&
8259 rdev
->raid_disk
>= 0 &&
8260 !test_bit(Blocked
, &rdev
->flags
) &&
8261 ((test_bit(RemoveSynchronized
, &rdev
->flags
) ||
8262 (!test_bit(In_sync
, &rdev
->flags
) &&
8263 !test_bit(Journal
, &rdev
->flags
))) &&
8264 atomic_read(&rdev
->nr_pending
)==0)) {
8265 if (mddev
->pers
->hot_remove_disk(
8266 mddev
, rdev
) == 0) {
8267 sysfs_unlink_rdev(mddev
, rdev
);
8268 rdev
->raid_disk
= -1;
8272 if (remove_some
&& test_bit(RemoveSynchronized
, &rdev
->flags
))
8273 clear_bit(RemoveSynchronized
, &rdev
->flags
);
8276 if (removed
&& mddev
->kobj
.sd
)
8277 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
8279 if (this && removed
)
8282 rdev_for_each(rdev
, mddev
) {
8283 if (this && this != rdev
)
8285 if (test_bit(Candidate
, &rdev
->flags
))
8287 if (rdev
->raid_disk
>= 0 &&
8288 !test_bit(In_sync
, &rdev
->flags
) &&
8289 !test_bit(Journal
, &rdev
->flags
) &&
8290 !test_bit(Faulty
, &rdev
->flags
))
8292 if (rdev
->raid_disk
>= 0)
8294 if (test_bit(Faulty
, &rdev
->flags
))
8296 if (!test_bit(Journal
, &rdev
->flags
)) {
8298 ! (rdev
->saved_raid_disk
>= 0 &&
8299 !test_bit(Bitmap_sync
, &rdev
->flags
)))
8302 rdev
->recovery_offset
= 0;
8305 hot_add_disk(mddev
, rdev
) == 0) {
8306 if (sysfs_link_rdev(mddev
, rdev
))
8307 /* failure here is OK */;
8308 if (!test_bit(Journal
, &rdev
->flags
))
8310 md_new_event(mddev
);
8311 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
8316 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
8320 static void md_start_sync(struct work_struct
*ws
)
8322 struct mddev
*mddev
= container_of(ws
, struct mddev
, del_work
);
8324 mddev
->sync_thread
= md_register_thread(md_do_sync
,
8327 if (!mddev
->sync_thread
) {
8328 pr_warn("%s: could not start resync thread...\n",
8330 /* leave the spares where they are, it shouldn't hurt */
8331 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8332 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
8333 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
8334 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
8335 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8336 wake_up(&resync_wait
);
8337 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
8339 if (mddev
->sysfs_action
)
8340 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
8342 md_wakeup_thread(mddev
->sync_thread
);
8343 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
8344 md_new_event(mddev
);
8348 * This routine is regularly called by all per-raid-array threads to
8349 * deal with generic issues like resync and super-block update.
8350 * Raid personalities that don't have a thread (linear/raid0) do not
8351 * need this as they never do any recovery or update the superblock.
8353 * It does not do any resync itself, but rather "forks" off other threads
8354 * to do that as needed.
8355 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
8356 * "->recovery" and create a thread at ->sync_thread.
8357 * When the thread finishes it sets MD_RECOVERY_DONE
8358 * and wakeups up this thread which will reap the thread and finish up.
8359 * This thread also removes any faulty devices (with nr_pending == 0).
8361 * The overall approach is:
8362 * 1/ if the superblock needs updating, update it.
8363 * 2/ If a recovery thread is running, don't do anything else.
8364 * 3/ If recovery has finished, clean up, possibly marking spares active.
8365 * 4/ If there are any faulty devices, remove them.
8366 * 5/ If array is degraded, try to add spares devices
8367 * 6/ If array has spares or is not in-sync, start a resync thread.
8369 void md_check_recovery(struct mddev
*mddev
)
8371 if (mddev
->suspended
)
8375 bitmap_daemon_work(mddev
);
8377 if (signal_pending(current
)) {
8378 if (mddev
->pers
->sync_request
&& !mddev
->external
) {
8379 pr_debug("md: %s in immediate safe mode\n",
8381 mddev
->safemode
= 2;
8383 flush_signals(current
);
8386 if (mddev
->ro
&& !test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
8389 (mddev
->sb_flags
& ~ (1<<MD_SB_CHANGE_PENDING
)) ||
8390 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
8391 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
8392 test_bit(MD_RELOAD_SB
, &mddev
->flags
) ||
8393 (mddev
->external
== 0 && mddev
->safemode
== 1) ||
8394 (mddev
->safemode
== 2 && ! atomic_read(&mddev
->writes_pending
)
8395 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
8399 if (mddev_trylock(mddev
)) {
8403 struct md_rdev
*rdev
;
8404 if (!mddev
->external
&& mddev
->in_sync
)
8405 /* 'Blocked' flag not needed as failed devices
8406 * will be recorded if array switched to read/write.
8407 * Leaving it set will prevent the device
8408 * from being removed.
8410 rdev_for_each(rdev
, mddev
)
8411 clear_bit(Blocked
, &rdev
->flags
);
8412 /* On a read-only array we can:
8413 * - remove failed devices
8414 * - add already-in_sync devices if the array itself
8416 * As we only add devices that are already in-sync,
8417 * we can activate the spares immediately.
8419 remove_and_add_spares(mddev
, NULL
);
8420 /* There is no thread, but we need to call
8421 * ->spare_active and clear saved_raid_disk
8423 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8424 md_reap_sync_thread(mddev
);
8425 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8426 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
8427 clear_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
8431 if (mddev_is_clustered(mddev
)) {
8432 struct md_rdev
*rdev
;
8433 /* kick the device if another node issued a
8436 rdev_for_each(rdev
, mddev
) {
8437 if (test_and_clear_bit(ClusterRemove
, &rdev
->flags
) &&
8438 rdev
->raid_disk
< 0)
8439 md_kick_rdev_from_array(rdev
);
8442 if (test_and_clear_bit(MD_RELOAD_SB
, &mddev
->flags
))
8443 md_reload_sb(mddev
, mddev
->good_device_nr
);
8446 if (!mddev
->external
) {
8448 spin_lock(&mddev
->lock
);
8449 if (mddev
->safemode
&&
8450 !atomic_read(&mddev
->writes_pending
) &&
8452 mddev
->recovery_cp
== MaxSector
) {
8455 set_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
8457 if (mddev
->safemode
== 1)
8458 mddev
->safemode
= 0;
8459 spin_unlock(&mddev
->lock
);
8461 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
8464 if (mddev
->sb_flags
)
8465 md_update_sb(mddev
, 0);
8467 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
8468 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
8469 /* resync/recovery still happening */
8470 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
8473 if (mddev
->sync_thread
) {
8474 md_reap_sync_thread(mddev
);
8477 /* Set RUNNING before clearing NEEDED to avoid
8478 * any transients in the value of "sync_action".
8480 mddev
->curr_resync_completed
= 0;
8481 spin_lock(&mddev
->lock
);
8482 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8483 spin_unlock(&mddev
->lock
);
8484 /* Clear some bits that don't mean anything, but
8487 clear_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8488 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
8490 if (!test_and_clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
8491 test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
8493 /* no recovery is running.
8494 * remove any failed drives, then
8495 * add spares if possible.
8496 * Spares are also removed and re-added, to allow
8497 * the personality to fail the re-add.
8500 if (mddev
->reshape_position
!= MaxSector
) {
8501 if (mddev
->pers
->check_reshape
== NULL
||
8502 mddev
->pers
->check_reshape(mddev
) != 0)
8503 /* Cannot proceed */
8505 set_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
8506 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8507 } else if ((spares
= remove_and_add_spares(mddev
, NULL
))) {
8508 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8509 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
8510 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
8511 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8512 } else if (mddev
->recovery_cp
< MaxSector
) {
8513 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8514 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8515 } else if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
8516 /* nothing to be done ... */
8519 if (mddev
->pers
->sync_request
) {
8521 /* We are adding a device or devices to an array
8522 * which has the bitmap stored on all devices.
8523 * So make sure all bitmap pages get written
8525 bitmap_write_all(mddev
->bitmap
);
8527 INIT_WORK(&mddev
->del_work
, md_start_sync
);
8528 queue_work(md_misc_wq
, &mddev
->del_work
);
8532 if (!mddev
->sync_thread
) {
8533 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8534 wake_up(&resync_wait
);
8535 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
8537 if (mddev
->sysfs_action
)
8538 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
8541 wake_up(&mddev
->sb_wait
);
8542 mddev_unlock(mddev
);
8545 EXPORT_SYMBOL(md_check_recovery
);
8547 void md_reap_sync_thread(struct mddev
*mddev
)
8549 struct md_rdev
*rdev
;
8551 /* resync has finished, collect result */
8552 md_unregister_thread(&mddev
->sync_thread
);
8553 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
8554 !test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
8556 /* activate any spares */
8557 if (mddev
->pers
->spare_active(mddev
)) {
8558 sysfs_notify(&mddev
->kobj
, NULL
,
8560 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
8563 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
8564 mddev
->pers
->finish_reshape
)
8565 mddev
->pers
->finish_reshape(mddev
);
8567 /* If array is no-longer degraded, then any saved_raid_disk
8568 * information must be scrapped.
8570 if (!mddev
->degraded
)
8571 rdev_for_each(rdev
, mddev
)
8572 rdev
->saved_raid_disk
= -1;
8574 md_update_sb(mddev
, 1);
8575 /* MD_SB_CHANGE_PENDING should be cleared by md_update_sb, so we can
8576 * call resync_finish here if MD_CLUSTER_RESYNC_LOCKED is set by
8578 if (test_and_clear_bit(MD_CLUSTER_RESYNC_LOCKED
, &mddev
->flags
))
8579 md_cluster_ops
->resync_finish(mddev
);
8580 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8581 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
8582 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8583 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
8584 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
8585 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
8586 wake_up(&resync_wait
);
8587 /* flag recovery needed just to double check */
8588 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
8589 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
8590 md_new_event(mddev
);
8591 if (mddev
->event_work
.func
)
8592 queue_work(md_misc_wq
, &mddev
->event_work
);
8594 EXPORT_SYMBOL(md_reap_sync_thread
);
8596 void md_wait_for_blocked_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
8598 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
8599 wait_event_timeout(rdev
->blocked_wait
,
8600 !test_bit(Blocked
, &rdev
->flags
) &&
8601 !test_bit(BlockedBadBlocks
, &rdev
->flags
),
8602 msecs_to_jiffies(5000));
8603 rdev_dec_pending(rdev
, mddev
);
8605 EXPORT_SYMBOL(md_wait_for_blocked_rdev
);
8607 void md_finish_reshape(struct mddev
*mddev
)
8609 /* called be personality module when reshape completes. */
8610 struct md_rdev
*rdev
;
8612 rdev_for_each(rdev
, mddev
) {
8613 if (rdev
->data_offset
> rdev
->new_data_offset
)
8614 rdev
->sectors
+= rdev
->data_offset
- rdev
->new_data_offset
;
8616 rdev
->sectors
-= rdev
->new_data_offset
- rdev
->data_offset
;
8617 rdev
->data_offset
= rdev
->new_data_offset
;
8620 EXPORT_SYMBOL(md_finish_reshape
);
8622 /* Bad block management */
8624 /* Returns 1 on success, 0 on failure */
8625 int rdev_set_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
8628 struct mddev
*mddev
= rdev
->mddev
;
8631 s
+= rdev
->new_data_offset
;
8633 s
+= rdev
->data_offset
;
8634 rv
= badblocks_set(&rdev
->badblocks
, s
, sectors
, 0);
8636 /* Make sure they get written out promptly */
8637 if (test_bit(ExternalBbl
, &rdev
->flags
))
8638 sysfs_notify(&rdev
->kobj
, NULL
,
8639 "unacknowledged_bad_blocks");
8640 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
8641 set_mask_bits(&mddev
->sb_flags
, 0,
8642 BIT(MD_SB_CHANGE_CLEAN
) | BIT(MD_SB_CHANGE_PENDING
));
8643 md_wakeup_thread(rdev
->mddev
->thread
);
8648 EXPORT_SYMBOL_GPL(rdev_set_badblocks
);
8650 int rdev_clear_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
8655 s
+= rdev
->new_data_offset
;
8657 s
+= rdev
->data_offset
;
8658 rv
= badblocks_clear(&rdev
->badblocks
, s
, sectors
);
8659 if ((rv
== 0) && test_bit(ExternalBbl
, &rdev
->flags
))
8660 sysfs_notify(&rdev
->kobj
, NULL
, "bad_blocks");
8663 EXPORT_SYMBOL_GPL(rdev_clear_badblocks
);
8665 static int md_notify_reboot(struct notifier_block
*this,
8666 unsigned long code
, void *x
)
8668 struct list_head
*tmp
;
8669 struct mddev
*mddev
;
8672 for_each_mddev(mddev
, tmp
) {
8673 if (mddev_trylock(mddev
)) {
8675 __md_stop_writes(mddev
);
8676 if (mddev
->persistent
)
8677 mddev
->safemode
= 2;
8678 mddev_unlock(mddev
);
8683 * certain more exotic SCSI devices are known to be
8684 * volatile wrt too early system reboots. While the
8685 * right place to handle this issue is the given
8686 * driver, we do want to have a safe RAID driver ...
8694 static struct notifier_block md_notifier
= {
8695 .notifier_call
= md_notify_reboot
,
8697 .priority
= INT_MAX
, /* before any real devices */
8700 static void md_geninit(void)
8702 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
8704 proc_create("mdstat", S_IRUGO
, NULL
, &md_seq_fops
);
8707 static int __init
md_init(void)
8711 md_wq
= alloc_workqueue("md", WQ_MEM_RECLAIM
, 0);
8715 md_misc_wq
= alloc_workqueue("md_misc", 0, 0);
8719 if ((ret
= register_blkdev(MD_MAJOR
, "md")) < 0)
8722 if ((ret
= register_blkdev(0, "mdp")) < 0)
8726 blk_register_region(MKDEV(MD_MAJOR
, 0), 512, THIS_MODULE
,
8727 md_probe
, NULL
, NULL
);
8728 blk_register_region(MKDEV(mdp_major
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
8729 md_probe
, NULL
, NULL
);
8731 register_reboot_notifier(&md_notifier
);
8732 raid_table_header
= register_sysctl_table(raid_root_table
);
8738 unregister_blkdev(MD_MAJOR
, "md");
8740 destroy_workqueue(md_misc_wq
);
8742 destroy_workqueue(md_wq
);
8747 static void check_sb_changes(struct mddev
*mddev
, struct md_rdev
*rdev
)
8749 struct mdp_superblock_1
*sb
= page_address(rdev
->sb_page
);
8750 struct md_rdev
*rdev2
;
8752 char b
[BDEVNAME_SIZE
];
8754 /* Check for change of roles in the active devices */
8755 rdev_for_each(rdev2
, mddev
) {
8756 if (test_bit(Faulty
, &rdev2
->flags
))
8759 /* Check if the roles changed */
8760 role
= le16_to_cpu(sb
->dev_roles
[rdev2
->desc_nr
]);
8762 if (test_bit(Candidate
, &rdev2
->flags
)) {
8763 if (role
== 0xfffe) {
8764 pr_info("md: Removing Candidate device %s because add failed\n", bdevname(rdev2
->bdev
,b
));
8765 md_kick_rdev_from_array(rdev2
);
8769 clear_bit(Candidate
, &rdev2
->flags
);
8772 if (role
!= rdev2
->raid_disk
) {
8774 if (rdev2
->raid_disk
== -1 && role
!= 0xffff) {
8775 rdev2
->saved_raid_disk
= role
;
8776 ret
= remove_and_add_spares(mddev
, rdev2
);
8777 pr_info("Activated spare: %s\n",
8778 bdevname(rdev2
->bdev
,b
));
8779 /* wakeup mddev->thread here, so array could
8780 * perform resync with the new activated disk */
8781 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
8782 md_wakeup_thread(mddev
->thread
);
8786 * We just want to do the minimum to mark the disk
8787 * as faulty. The recovery is performed by the
8788 * one who initiated the error.
8790 if ((role
== 0xfffe) || (role
== 0xfffd)) {
8791 md_error(mddev
, rdev2
);
8792 clear_bit(Blocked
, &rdev2
->flags
);
8797 if (mddev
->raid_disks
!= le32_to_cpu(sb
->raid_disks
))
8798 update_raid_disks(mddev
, le32_to_cpu(sb
->raid_disks
));
8800 /* Finally set the event to be up to date */
8801 mddev
->events
= le64_to_cpu(sb
->events
);
8804 static int read_rdev(struct mddev
*mddev
, struct md_rdev
*rdev
)
8807 struct page
*swapout
= rdev
->sb_page
;
8808 struct mdp_superblock_1
*sb
;
8810 /* Store the sb page of the rdev in the swapout temporary
8811 * variable in case we err in the future
8813 rdev
->sb_page
= NULL
;
8814 err
= alloc_disk_sb(rdev
);
8816 ClearPageUptodate(rdev
->sb_page
);
8817 rdev
->sb_loaded
= 0;
8818 err
= super_types
[mddev
->major_version
].
8819 load_super(rdev
, NULL
, mddev
->minor_version
);
8822 pr_warn("%s: %d Could not reload rdev(%d) err: %d. Restoring old values\n",
8823 __func__
, __LINE__
, rdev
->desc_nr
, err
);
8825 put_page(rdev
->sb_page
);
8826 rdev
->sb_page
= swapout
;
8827 rdev
->sb_loaded
= 1;
8831 sb
= page_address(rdev
->sb_page
);
8832 /* Read the offset unconditionally, even if MD_FEATURE_RECOVERY_OFFSET
8836 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RECOVERY_OFFSET
))
8837 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
8839 /* The other node finished recovery, call spare_active to set
8840 * device In_sync and mddev->degraded
8842 if (rdev
->recovery_offset
== MaxSector
&&
8843 !test_bit(In_sync
, &rdev
->flags
) &&
8844 mddev
->pers
->spare_active(mddev
))
8845 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
8851 void md_reload_sb(struct mddev
*mddev
, int nr
)
8853 struct md_rdev
*rdev
;
8857 rdev_for_each_rcu(rdev
, mddev
) {
8858 if (rdev
->desc_nr
== nr
)
8862 if (!rdev
|| rdev
->desc_nr
!= nr
) {
8863 pr_warn("%s: %d Could not find rdev with nr %d\n", __func__
, __LINE__
, nr
);
8867 err
= read_rdev(mddev
, rdev
);
8871 check_sb_changes(mddev
, rdev
);
8873 /* Read all rdev's to update recovery_offset */
8874 rdev_for_each_rcu(rdev
, mddev
)
8875 read_rdev(mddev
, rdev
);
8877 EXPORT_SYMBOL(md_reload_sb
);
8882 * Searches all registered partitions for autorun RAID arrays
8886 static DEFINE_MUTEX(detected_devices_mutex
);
8887 static LIST_HEAD(all_detected_devices
);
8888 struct detected_devices_node
{
8889 struct list_head list
;
8893 void md_autodetect_dev(dev_t dev
)
8895 struct detected_devices_node
*node_detected_dev
;
8897 node_detected_dev
= kzalloc(sizeof(*node_detected_dev
), GFP_KERNEL
);
8898 if (node_detected_dev
) {
8899 node_detected_dev
->dev
= dev
;
8900 mutex_lock(&detected_devices_mutex
);
8901 list_add_tail(&node_detected_dev
->list
, &all_detected_devices
);
8902 mutex_unlock(&detected_devices_mutex
);
8906 static void autostart_arrays(int part
)
8908 struct md_rdev
*rdev
;
8909 struct detected_devices_node
*node_detected_dev
;
8911 int i_scanned
, i_passed
;
8916 pr_info("md: Autodetecting RAID arrays.\n");
8918 mutex_lock(&detected_devices_mutex
);
8919 while (!list_empty(&all_detected_devices
) && i_scanned
< INT_MAX
) {
8921 node_detected_dev
= list_entry(all_detected_devices
.next
,
8922 struct detected_devices_node
, list
);
8923 list_del(&node_detected_dev
->list
);
8924 dev
= node_detected_dev
->dev
;
8925 kfree(node_detected_dev
);
8926 mutex_unlock(&detected_devices_mutex
);
8927 rdev
= md_import_device(dev
,0, 90);
8928 mutex_lock(&detected_devices_mutex
);
8932 if (test_bit(Faulty
, &rdev
->flags
))
8935 set_bit(AutoDetected
, &rdev
->flags
);
8936 list_add(&rdev
->same_set
, &pending_raid_disks
);
8939 mutex_unlock(&detected_devices_mutex
);
8941 pr_debug("md: Scanned %d and added %d devices.\n", i_scanned
, i_passed
);
8943 autorun_devices(part
);
8946 #endif /* !MODULE */
8948 static __exit
void md_exit(void)
8950 struct mddev
*mddev
;
8951 struct list_head
*tmp
;
8954 blk_unregister_region(MKDEV(MD_MAJOR
,0), 512);
8955 blk_unregister_region(MKDEV(mdp_major
,0), 1U << MINORBITS
);
8957 unregister_blkdev(MD_MAJOR
,"md");
8958 unregister_blkdev(mdp_major
, "mdp");
8959 unregister_reboot_notifier(&md_notifier
);
8960 unregister_sysctl_table(raid_table_header
);
8962 /* We cannot unload the modules while some process is
8963 * waiting for us in select() or poll() - wake them up
8966 while (waitqueue_active(&md_event_waiters
)) {
8967 /* not safe to leave yet */
8968 wake_up(&md_event_waiters
);
8972 remove_proc_entry("mdstat", NULL
);
8974 for_each_mddev(mddev
, tmp
) {
8975 export_array(mddev
);
8977 mddev
->hold_active
= 0;
8979 * for_each_mddev() will call mddev_put() at the end of each
8980 * iteration. As the mddev is now fully clear, this will
8981 * schedule the mddev for destruction by a workqueue, and the
8982 * destroy_workqueue() below will wait for that to complete.
8985 destroy_workqueue(md_misc_wq
);
8986 destroy_workqueue(md_wq
);
8989 subsys_initcall(md_init
);
8990 module_exit(md_exit
)
8992 static int get_ro(char *buffer
, struct kernel_param
*kp
)
8994 return sprintf(buffer
, "%d", start_readonly
);
8996 static int set_ro(const char *val
, struct kernel_param
*kp
)
8998 return kstrtouint(val
, 10, (unsigned int *)&start_readonly
);
9001 module_param_call(start_ro
, set_ro
, get_ro
, NULL
, S_IRUSR
|S_IWUSR
);
9002 module_param(start_dirty_degraded
, int, S_IRUGO
|S_IWUSR
);
9003 module_param_call(new_array
, add_named_array
, NULL
, NULL
, S_IWUSR
);
9005 MODULE_LICENSE("GPL");
9006 MODULE_DESCRIPTION("MD RAID framework");
9008 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);