2 md.c : Multiple Devices driver for Linux
3 Copyright (C) 1998, 1999, 2000 Ingo Molnar
5 completely rewritten, based on the MD driver code from Marc Zyngier
9 - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar
10 - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com>
11 - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net>
12 - kerneld support by Boris Tobotras <boris@xtalk.msk.su>
13 - kmod support by: Cyrus Durgin
14 - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com>
15 - Devfs support by Richard Gooch <rgooch@atnf.csiro.au>
17 - lots of fixes and improvements to the RAID1/RAID5 and generic
18 RAID code (such as request based resynchronization):
20 Neil Brown <neilb@cse.unsw.edu.au>.
22 - persistent bitmap code
23 Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.
25 This program is free software; you can redistribute it and/or modify
26 it under the terms of the GNU General Public License as published by
27 the Free Software Foundation; either version 2, or (at your option)
30 You should have received a copy of the GNU General Public License
31 (for example /usr/src/linux/COPYING); if not, write to the Free
32 Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
34 Errors, Warnings, etc.
36 pr_crit() for error conditions that risk data loss
37 pr_err() for error conditions that are unexpected, like an IO error
38 or internal inconsistency
39 pr_warn() for error conditions that could have been predicated, like
40 adding a device to an array when it has incompatible metadata
41 pr_info() for every interesting, very rare events, like an array starting
42 or stopping, or resync starting or stopping
43 pr_debug() for everything else.
47 #include <linux/sched/signal.h>
48 #include <linux/kthread.h>
49 #include <linux/blkdev.h>
50 #include <linux/badblocks.h>
51 #include <linux/sysctl.h>
52 #include <linux/seq_file.h>
54 #include <linux/poll.h>
55 #include <linux/ctype.h>
56 #include <linux/string.h>
57 #include <linux/hdreg.h>
58 #include <linux/proc_fs.h>
59 #include <linux/random.h>
60 #include <linux/module.h>
61 #include <linux/reboot.h>
62 #include <linux/file.h>
63 #include <linux/compat.h>
64 #include <linux/delay.h>
65 #include <linux/raid/md_p.h>
66 #include <linux/raid/md_u.h>
67 #include <linux/slab.h>
68 #include <linux/percpu-refcount.h>
70 #include <trace/events/block.h>
73 #include "md-cluster.h"
76 static void autostart_arrays(int part
);
79 /* pers_list is a list of registered personalities protected
81 * pers_lock does extra service to protect accesses to
82 * mddev->thread when the mutex cannot be held.
84 static LIST_HEAD(pers_list
);
85 static DEFINE_SPINLOCK(pers_lock
);
87 struct md_cluster_operations
*md_cluster_ops
;
88 EXPORT_SYMBOL(md_cluster_ops
);
89 struct module
*md_cluster_mod
;
90 EXPORT_SYMBOL(md_cluster_mod
);
92 static DECLARE_WAIT_QUEUE_HEAD(resync_wait
);
93 static struct workqueue_struct
*md_wq
;
94 static struct workqueue_struct
*md_misc_wq
;
96 static int remove_and_add_spares(struct mddev
*mddev
,
97 struct md_rdev
*this);
98 static void mddev_detach(struct mddev
*mddev
);
101 * Default number of read corrections we'll attempt on an rdev
102 * before ejecting it from the array. We divide the read error
103 * count by 2 for every hour elapsed between read errors.
105 #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
107 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
108 * is 1000 KB/sec, so the extra system load does not show up that much.
109 * Increase it if you want to have more _guaranteed_ speed. Note that
110 * the RAID driver will use the maximum available bandwidth if the IO
111 * subsystem is idle. There is also an 'absolute maximum' reconstruction
112 * speed limit - in case reconstruction slows down your system despite
115 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
116 * or /sys/block/mdX/md/sync_speed_{min,max}
119 static int sysctl_speed_limit_min
= 1000;
120 static int sysctl_speed_limit_max
= 200000;
121 static inline int speed_min(struct mddev
*mddev
)
123 return mddev
->sync_speed_min
?
124 mddev
->sync_speed_min
: sysctl_speed_limit_min
;
127 static inline int speed_max(struct mddev
*mddev
)
129 return mddev
->sync_speed_max
?
130 mddev
->sync_speed_max
: sysctl_speed_limit_max
;
133 static struct ctl_table_header
*raid_table_header
;
135 static struct ctl_table raid_table
[] = {
137 .procname
= "speed_limit_min",
138 .data
= &sysctl_speed_limit_min
,
139 .maxlen
= sizeof(int),
140 .mode
= S_IRUGO
|S_IWUSR
,
141 .proc_handler
= proc_dointvec
,
144 .procname
= "speed_limit_max",
145 .data
= &sysctl_speed_limit_max
,
146 .maxlen
= sizeof(int),
147 .mode
= S_IRUGO
|S_IWUSR
,
148 .proc_handler
= proc_dointvec
,
153 static struct ctl_table raid_dir_table
[] = {
157 .mode
= S_IRUGO
|S_IXUGO
,
163 static struct ctl_table raid_root_table
[] = {
168 .child
= raid_dir_table
,
173 static const struct block_device_operations md_fops
;
175 static int start_readonly
;
178 * The original mechanism for creating an md device is to create
179 * a device node in /dev and to open it. This causes races with device-close.
180 * The preferred method is to write to the "new_array" module parameter.
181 * This can avoid races.
182 * Setting create_on_open to false disables the original mechanism
183 * so all the races disappear.
185 static bool create_on_open
= true;
188 * like bio_clone, but with a local bio set
191 struct bio
*bio_alloc_mddev(gfp_t gfp_mask
, int nr_iovecs
,
196 if (!mddev
|| !mddev
->bio_set
)
197 return bio_alloc(gfp_mask
, nr_iovecs
);
199 b
= bio_alloc_bioset(gfp_mask
, nr_iovecs
, mddev
->bio_set
);
204 EXPORT_SYMBOL_GPL(bio_alloc_mddev
);
207 * We have a system wide 'event count' that is incremented
208 * on any 'interesting' event, and readers of /proc/mdstat
209 * can use 'poll' or 'select' to find out when the event
213 * start array, stop array, error, add device, remove device,
214 * start build, activate spare
216 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters
);
217 static atomic_t md_event_count
;
218 void md_new_event(struct mddev
*mddev
)
220 atomic_inc(&md_event_count
);
221 wake_up(&md_event_waiters
);
223 EXPORT_SYMBOL_GPL(md_new_event
);
226 * Enables to iterate over all existing md arrays
227 * all_mddevs_lock protects this list.
229 static LIST_HEAD(all_mddevs
);
230 static DEFINE_SPINLOCK(all_mddevs_lock
);
233 * iterates through all used mddevs in the system.
234 * We take care to grab the all_mddevs_lock whenever navigating
235 * the list, and to always hold a refcount when unlocked.
236 * Any code which breaks out of this loop while own
237 * a reference to the current mddev and must mddev_put it.
239 #define for_each_mddev(_mddev,_tmp) \
241 for (({ spin_lock(&all_mddevs_lock); \
242 _tmp = all_mddevs.next; \
244 ({ if (_tmp != &all_mddevs) \
245 mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\
246 spin_unlock(&all_mddevs_lock); \
247 if (_mddev) mddev_put(_mddev); \
248 _mddev = list_entry(_tmp, struct mddev, all_mddevs); \
249 _tmp != &all_mddevs;}); \
250 ({ spin_lock(&all_mddevs_lock); \
251 _tmp = _tmp->next;}) \
254 /* Rather than calling directly into the personality make_request function,
255 * IO requests come here first so that we can check if the device is
256 * being suspended pending a reconfiguration.
257 * We hold a refcount over the call to ->make_request. By the time that
258 * call has finished, the bio has been linked into some internal structure
259 * and so is visible to ->quiesce(), so we don't need the refcount any more.
261 static blk_qc_t
md_make_request(struct request_queue
*q
, struct bio
*bio
)
263 const int rw
= bio_data_dir(bio
);
264 struct mddev
*mddev
= q
->queuedata
;
265 unsigned int sectors
;
268 blk_queue_split(q
, &bio
, q
->bio_split
);
270 if (mddev
== NULL
|| mddev
->pers
== NULL
) {
272 return BLK_QC_T_NONE
;
274 if (mddev
->ro
== 1 && unlikely(rw
== WRITE
)) {
275 if (bio_sectors(bio
) != 0)
276 bio
->bi_error
= -EROFS
;
278 return BLK_QC_T_NONE
;
282 if (mddev
->suspended
) {
285 prepare_to_wait(&mddev
->sb_wait
, &__wait
,
286 TASK_UNINTERRUPTIBLE
);
287 if (!mddev
->suspended
)
293 finish_wait(&mddev
->sb_wait
, &__wait
);
295 atomic_inc(&mddev
->active_io
);
299 * save the sectors now since our bio can
300 * go away inside make_request
302 sectors
= bio_sectors(bio
);
303 /* bio could be mergeable after passing to underlayer */
304 bio
->bi_opf
&= ~REQ_NOMERGE
;
305 if (!mddev
->pers
->make_request(mddev
, bio
)) {
306 atomic_dec(&mddev
->active_io
);
307 wake_up(&mddev
->sb_wait
);
308 goto check_suspended
;
311 cpu
= part_stat_lock();
312 part_stat_inc(cpu
, &mddev
->gendisk
->part0
, ios
[rw
]);
313 part_stat_add(cpu
, &mddev
->gendisk
->part0
, sectors
[rw
], sectors
);
316 if (atomic_dec_and_test(&mddev
->active_io
) && mddev
->suspended
)
317 wake_up(&mddev
->sb_wait
);
319 return BLK_QC_T_NONE
;
322 /* mddev_suspend makes sure no new requests are submitted
323 * to the device, and that any requests that have been submitted
324 * are completely handled.
325 * Once mddev_detach() is called and completes, the module will be
328 void mddev_suspend(struct mddev
*mddev
)
330 WARN_ON_ONCE(mddev
->thread
&& current
== mddev
->thread
->tsk
);
331 if (mddev
->suspended
++)
334 wake_up(&mddev
->sb_wait
);
335 wait_event(mddev
->sb_wait
, atomic_read(&mddev
->active_io
) == 0);
336 mddev
->pers
->quiesce(mddev
, 1);
338 del_timer_sync(&mddev
->safemode_timer
);
340 EXPORT_SYMBOL_GPL(mddev_suspend
);
342 void mddev_resume(struct mddev
*mddev
)
344 if (--mddev
->suspended
)
346 wake_up(&mddev
->sb_wait
);
347 mddev
->pers
->quiesce(mddev
, 0);
349 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
350 md_wakeup_thread(mddev
->thread
);
351 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
353 EXPORT_SYMBOL_GPL(mddev_resume
);
355 int mddev_congested(struct mddev
*mddev
, int bits
)
357 struct md_personality
*pers
= mddev
->pers
;
361 if (mddev
->suspended
)
363 else if (pers
&& pers
->congested
)
364 ret
= pers
->congested(mddev
, bits
);
368 EXPORT_SYMBOL_GPL(mddev_congested
);
369 static int md_congested(void *data
, int bits
)
371 struct mddev
*mddev
= data
;
372 return mddev_congested(mddev
, bits
);
376 * Generic flush handling for md
379 static void md_end_flush(struct bio
*bio
)
381 struct md_rdev
*rdev
= bio
->bi_private
;
382 struct mddev
*mddev
= rdev
->mddev
;
384 rdev_dec_pending(rdev
, mddev
);
386 if (atomic_dec_and_test(&mddev
->flush_pending
)) {
387 /* The pre-request flush has finished */
388 queue_work(md_wq
, &mddev
->flush_work
);
393 static void md_submit_flush_data(struct work_struct
*ws
);
395 static void submit_flushes(struct work_struct
*ws
)
397 struct mddev
*mddev
= container_of(ws
, struct mddev
, flush_work
);
398 struct md_rdev
*rdev
;
400 INIT_WORK(&mddev
->flush_work
, md_submit_flush_data
);
401 atomic_set(&mddev
->flush_pending
, 1);
403 rdev_for_each_rcu(rdev
, mddev
)
404 if (rdev
->raid_disk
>= 0 &&
405 !test_bit(Faulty
, &rdev
->flags
)) {
406 /* Take two references, one is dropped
407 * when request finishes, one after
408 * we reclaim rcu_read_lock
411 atomic_inc(&rdev
->nr_pending
);
412 atomic_inc(&rdev
->nr_pending
);
414 bi
= bio_alloc_mddev(GFP_NOIO
, 0, mddev
);
415 bi
->bi_end_io
= md_end_flush
;
416 bi
->bi_private
= rdev
;
417 bi
->bi_bdev
= rdev
->bdev
;
418 bi
->bi_opf
= REQ_OP_WRITE
| REQ_PREFLUSH
;
419 atomic_inc(&mddev
->flush_pending
);
422 rdev_dec_pending(rdev
, mddev
);
425 if (atomic_dec_and_test(&mddev
->flush_pending
))
426 queue_work(md_wq
, &mddev
->flush_work
);
429 static void md_submit_flush_data(struct work_struct
*ws
)
431 struct mddev
*mddev
= container_of(ws
, struct mddev
, flush_work
);
432 struct bio
*bio
= mddev
->flush_bio
;
434 if (bio
->bi_iter
.bi_size
== 0)
435 /* an empty barrier - all done */
438 bio
->bi_opf
&= ~REQ_PREFLUSH
;
439 mddev
->pers
->make_request(mddev
, bio
);
442 mddev
->flush_bio
= NULL
;
443 wake_up(&mddev
->sb_wait
);
446 void md_flush_request(struct mddev
*mddev
, struct bio
*bio
)
448 spin_lock_irq(&mddev
->lock
);
449 wait_event_lock_irq(mddev
->sb_wait
,
452 mddev
->flush_bio
= bio
;
453 spin_unlock_irq(&mddev
->lock
);
455 INIT_WORK(&mddev
->flush_work
, submit_flushes
);
456 queue_work(md_wq
, &mddev
->flush_work
);
458 EXPORT_SYMBOL(md_flush_request
);
460 static inline struct mddev
*mddev_get(struct mddev
*mddev
)
462 atomic_inc(&mddev
->active
);
466 static void mddev_delayed_delete(struct work_struct
*ws
);
468 static void mddev_put(struct mddev
*mddev
)
470 struct bio_set
*bs
= NULL
;
472 if (!atomic_dec_and_lock(&mddev
->active
, &all_mddevs_lock
))
474 if (!mddev
->raid_disks
&& list_empty(&mddev
->disks
) &&
475 mddev
->ctime
== 0 && !mddev
->hold_active
) {
476 /* Array is not configured at all, and not held active,
478 list_del_init(&mddev
->all_mddevs
);
480 mddev
->bio_set
= NULL
;
481 if (mddev
->gendisk
) {
482 /* We did a probe so need to clean up. Call
483 * queue_work inside the spinlock so that
484 * flush_workqueue() after mddev_find will
485 * succeed in waiting for the work to be done.
487 INIT_WORK(&mddev
->del_work
, mddev_delayed_delete
);
488 queue_work(md_misc_wq
, &mddev
->del_work
);
492 spin_unlock(&all_mddevs_lock
);
497 static void md_safemode_timeout(unsigned long data
);
499 void mddev_init(struct mddev
*mddev
)
501 mutex_init(&mddev
->open_mutex
);
502 mutex_init(&mddev
->reconfig_mutex
);
503 mutex_init(&mddev
->bitmap_info
.mutex
);
504 INIT_LIST_HEAD(&mddev
->disks
);
505 INIT_LIST_HEAD(&mddev
->all_mddevs
);
506 setup_timer(&mddev
->safemode_timer
, md_safemode_timeout
,
507 (unsigned long) mddev
);
508 atomic_set(&mddev
->active
, 1);
509 atomic_set(&mddev
->openers
, 0);
510 atomic_set(&mddev
->active_io
, 0);
511 spin_lock_init(&mddev
->lock
);
512 atomic_set(&mddev
->flush_pending
, 0);
513 init_waitqueue_head(&mddev
->sb_wait
);
514 init_waitqueue_head(&mddev
->recovery_wait
);
515 mddev
->reshape_position
= MaxSector
;
516 mddev
->reshape_backwards
= 0;
517 mddev
->last_sync_action
= "none";
518 mddev
->resync_min
= 0;
519 mddev
->resync_max
= MaxSector
;
520 mddev
->level
= LEVEL_NONE
;
522 EXPORT_SYMBOL_GPL(mddev_init
);
524 static struct mddev
*mddev_find(dev_t unit
)
526 struct mddev
*mddev
, *new = NULL
;
528 if (unit
&& MAJOR(unit
) != MD_MAJOR
)
529 unit
&= ~((1<<MdpMinorShift
)-1);
532 spin_lock(&all_mddevs_lock
);
535 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
536 if (mddev
->unit
== unit
) {
538 spin_unlock(&all_mddevs_lock
);
544 list_add(&new->all_mddevs
, &all_mddevs
);
545 spin_unlock(&all_mddevs_lock
);
546 new->hold_active
= UNTIL_IOCTL
;
550 /* find an unused unit number */
551 static int next_minor
= 512;
552 int start
= next_minor
;
556 dev
= MKDEV(MD_MAJOR
, next_minor
);
558 if (next_minor
> MINORMASK
)
560 if (next_minor
== start
) {
561 /* Oh dear, all in use. */
562 spin_unlock(&all_mddevs_lock
);
568 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
569 if (mddev
->unit
== dev
) {
575 new->md_minor
= MINOR(dev
);
576 new->hold_active
= UNTIL_STOP
;
577 list_add(&new->all_mddevs
, &all_mddevs
);
578 spin_unlock(&all_mddevs_lock
);
581 spin_unlock(&all_mddevs_lock
);
583 new = kzalloc(sizeof(*new), GFP_KERNEL
);
588 if (MAJOR(unit
) == MD_MAJOR
)
589 new->md_minor
= MINOR(unit
);
591 new->md_minor
= MINOR(unit
) >> MdpMinorShift
;
598 static struct attribute_group md_redundancy_group
;
600 void mddev_unlock(struct mddev
*mddev
)
602 if (mddev
->to_remove
) {
603 /* These cannot be removed under reconfig_mutex as
604 * an access to the files will try to take reconfig_mutex
605 * while holding the file unremovable, which leads to
607 * So hold set sysfs_active while the remove in happeing,
608 * and anything else which might set ->to_remove or my
609 * otherwise change the sysfs namespace will fail with
610 * -EBUSY if sysfs_active is still set.
611 * We set sysfs_active under reconfig_mutex and elsewhere
612 * test it under the same mutex to ensure its correct value
615 struct attribute_group
*to_remove
= mddev
->to_remove
;
616 mddev
->to_remove
= NULL
;
617 mddev
->sysfs_active
= 1;
618 mutex_unlock(&mddev
->reconfig_mutex
);
620 if (mddev
->kobj
.sd
) {
621 if (to_remove
!= &md_redundancy_group
)
622 sysfs_remove_group(&mddev
->kobj
, to_remove
);
623 if (mddev
->pers
== NULL
||
624 mddev
->pers
->sync_request
== NULL
) {
625 sysfs_remove_group(&mddev
->kobj
, &md_redundancy_group
);
626 if (mddev
->sysfs_action
)
627 sysfs_put(mddev
->sysfs_action
);
628 mddev
->sysfs_action
= NULL
;
631 mddev
->sysfs_active
= 0;
633 mutex_unlock(&mddev
->reconfig_mutex
);
635 /* As we've dropped the mutex we need a spinlock to
636 * make sure the thread doesn't disappear
638 spin_lock(&pers_lock
);
639 md_wakeup_thread(mddev
->thread
);
640 spin_unlock(&pers_lock
);
642 EXPORT_SYMBOL_GPL(mddev_unlock
);
644 struct md_rdev
*md_find_rdev_nr_rcu(struct mddev
*mddev
, int nr
)
646 struct md_rdev
*rdev
;
648 rdev_for_each_rcu(rdev
, mddev
)
649 if (rdev
->desc_nr
== nr
)
654 EXPORT_SYMBOL_GPL(md_find_rdev_nr_rcu
);
656 static struct md_rdev
*find_rdev(struct mddev
*mddev
, dev_t dev
)
658 struct md_rdev
*rdev
;
660 rdev_for_each(rdev
, mddev
)
661 if (rdev
->bdev
->bd_dev
== dev
)
667 static struct md_rdev
*find_rdev_rcu(struct mddev
*mddev
, dev_t dev
)
669 struct md_rdev
*rdev
;
671 rdev_for_each_rcu(rdev
, mddev
)
672 if (rdev
->bdev
->bd_dev
== dev
)
678 static struct md_personality
*find_pers(int level
, char *clevel
)
680 struct md_personality
*pers
;
681 list_for_each_entry(pers
, &pers_list
, list
) {
682 if (level
!= LEVEL_NONE
&& pers
->level
== level
)
684 if (strcmp(pers
->name
, clevel
)==0)
690 /* return the offset of the super block in 512byte sectors */
691 static inline sector_t
calc_dev_sboffset(struct md_rdev
*rdev
)
693 sector_t num_sectors
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
694 return MD_NEW_SIZE_SECTORS(num_sectors
);
697 static int alloc_disk_sb(struct md_rdev
*rdev
)
699 rdev
->sb_page
= alloc_page(GFP_KERNEL
);
705 void md_rdev_clear(struct md_rdev
*rdev
)
708 put_page(rdev
->sb_page
);
710 rdev
->sb_page
= NULL
;
715 put_page(rdev
->bb_page
);
716 rdev
->bb_page
= NULL
;
718 badblocks_exit(&rdev
->badblocks
);
720 EXPORT_SYMBOL_GPL(md_rdev_clear
);
722 static void super_written(struct bio
*bio
)
724 struct md_rdev
*rdev
= bio
->bi_private
;
725 struct mddev
*mddev
= rdev
->mddev
;
728 pr_err("md: super_written gets error=%d\n", bio
->bi_error
);
729 md_error(mddev
, rdev
);
730 if (!test_bit(Faulty
, &rdev
->flags
)
731 && (bio
->bi_opf
& MD_FAILFAST
)) {
732 set_bit(MD_SB_NEED_REWRITE
, &mddev
->sb_flags
);
733 set_bit(LastDev
, &rdev
->flags
);
736 clear_bit(LastDev
, &rdev
->flags
);
738 if (atomic_dec_and_test(&mddev
->pending_writes
))
739 wake_up(&mddev
->sb_wait
);
740 rdev_dec_pending(rdev
, mddev
);
744 void md_super_write(struct mddev
*mddev
, struct md_rdev
*rdev
,
745 sector_t sector
, int size
, struct page
*page
)
747 /* write first size bytes of page to sector of rdev
748 * Increment mddev->pending_writes before returning
749 * and decrement it on completion, waking up sb_wait
750 * if zero is reached.
751 * If an error occurred, call md_error
756 if (test_bit(Faulty
, &rdev
->flags
))
759 bio
= bio_alloc_mddev(GFP_NOIO
, 1, mddev
);
761 atomic_inc(&rdev
->nr_pending
);
763 bio
->bi_bdev
= rdev
->meta_bdev
? rdev
->meta_bdev
: rdev
->bdev
;
764 bio
->bi_iter
.bi_sector
= sector
;
765 bio_add_page(bio
, page
, size
, 0);
766 bio
->bi_private
= rdev
;
767 bio
->bi_end_io
= super_written
;
769 if (test_bit(MD_FAILFAST_SUPPORTED
, &mddev
->flags
) &&
770 test_bit(FailFast
, &rdev
->flags
) &&
771 !test_bit(LastDev
, &rdev
->flags
))
773 bio
->bi_opf
= REQ_OP_WRITE
| REQ_SYNC
| REQ_PREFLUSH
| REQ_FUA
| ff
;
775 atomic_inc(&mddev
->pending_writes
);
779 int md_super_wait(struct mddev
*mddev
)
781 /* wait for all superblock writes that were scheduled to complete */
782 wait_event(mddev
->sb_wait
, atomic_read(&mddev
->pending_writes
)==0);
783 if (test_and_clear_bit(MD_SB_NEED_REWRITE
, &mddev
->sb_flags
))
788 int sync_page_io(struct md_rdev
*rdev
, sector_t sector
, int size
,
789 struct page
*page
, int op
, int op_flags
, bool metadata_op
)
791 struct bio
*bio
= bio_alloc_mddev(GFP_NOIO
, 1, rdev
->mddev
);
794 bio
->bi_bdev
= (metadata_op
&& rdev
->meta_bdev
) ?
795 rdev
->meta_bdev
: rdev
->bdev
;
796 bio_set_op_attrs(bio
, op
, op_flags
);
798 bio
->bi_iter
.bi_sector
= sector
+ rdev
->sb_start
;
799 else if (rdev
->mddev
->reshape_position
!= MaxSector
&&
800 (rdev
->mddev
->reshape_backwards
==
801 (sector
>= rdev
->mddev
->reshape_position
)))
802 bio
->bi_iter
.bi_sector
= sector
+ rdev
->new_data_offset
;
804 bio
->bi_iter
.bi_sector
= sector
+ rdev
->data_offset
;
805 bio_add_page(bio
, page
, size
, 0);
807 submit_bio_wait(bio
);
809 ret
= !bio
->bi_error
;
813 EXPORT_SYMBOL_GPL(sync_page_io
);
815 static int read_disk_sb(struct md_rdev
*rdev
, int size
)
817 char b
[BDEVNAME_SIZE
];
822 if (!sync_page_io(rdev
, 0, size
, rdev
->sb_page
, REQ_OP_READ
, 0, true))
828 pr_err("md: disabled device %s, could not read superblock.\n",
829 bdevname(rdev
->bdev
,b
));
833 static int uuid_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
835 return sb1
->set_uuid0
== sb2
->set_uuid0
&&
836 sb1
->set_uuid1
== sb2
->set_uuid1
&&
837 sb1
->set_uuid2
== sb2
->set_uuid2
&&
838 sb1
->set_uuid3
== sb2
->set_uuid3
;
841 static int sb_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
844 mdp_super_t
*tmp1
, *tmp2
;
846 tmp1
= kmalloc(sizeof(*tmp1
),GFP_KERNEL
);
847 tmp2
= kmalloc(sizeof(*tmp2
),GFP_KERNEL
);
849 if (!tmp1
|| !tmp2
) {
858 * nr_disks is not constant
863 ret
= (memcmp(tmp1
, tmp2
, MD_SB_GENERIC_CONSTANT_WORDS
* 4) == 0);
870 static u32
md_csum_fold(u32 csum
)
872 csum
= (csum
& 0xffff) + (csum
>> 16);
873 return (csum
& 0xffff) + (csum
>> 16);
876 static unsigned int calc_sb_csum(mdp_super_t
*sb
)
879 u32
*sb32
= (u32
*)sb
;
881 unsigned int disk_csum
, csum
;
883 disk_csum
= sb
->sb_csum
;
886 for (i
= 0; i
< MD_SB_BYTES
/4 ; i
++)
888 csum
= (newcsum
& 0xffffffff) + (newcsum
>>32);
891 /* This used to use csum_partial, which was wrong for several
892 * reasons including that different results are returned on
893 * different architectures. It isn't critical that we get exactly
894 * the same return value as before (we always csum_fold before
895 * testing, and that removes any differences). However as we
896 * know that csum_partial always returned a 16bit value on
897 * alphas, do a fold to maximise conformity to previous behaviour.
899 sb
->sb_csum
= md_csum_fold(disk_csum
);
901 sb
->sb_csum
= disk_csum
;
907 * Handle superblock details.
908 * We want to be able to handle multiple superblock formats
909 * so we have a common interface to them all, and an array of
910 * different handlers.
911 * We rely on user-space to write the initial superblock, and support
912 * reading and updating of superblocks.
913 * Interface methods are:
914 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version)
915 * loads and validates a superblock on dev.
916 * if refdev != NULL, compare superblocks on both devices
918 * 0 - dev has a superblock that is compatible with refdev
919 * 1 - dev has a superblock that is compatible and newer than refdev
920 * so dev should be used as the refdev in future
921 * -EINVAL superblock incompatible or invalid
922 * -othererror e.g. -EIO
924 * int validate_super(struct mddev *mddev, struct md_rdev *dev)
925 * Verify that dev is acceptable into mddev.
926 * The first time, mddev->raid_disks will be 0, and data from
927 * dev should be merged in. Subsequent calls check that dev
928 * is new enough. Return 0 or -EINVAL
930 * void sync_super(struct mddev *mddev, struct md_rdev *dev)
931 * Update the superblock for rdev with data in mddev
932 * This does not write to disc.
938 struct module
*owner
;
939 int (*load_super
)(struct md_rdev
*rdev
,
940 struct md_rdev
*refdev
,
942 int (*validate_super
)(struct mddev
*mddev
,
943 struct md_rdev
*rdev
);
944 void (*sync_super
)(struct mddev
*mddev
,
945 struct md_rdev
*rdev
);
946 unsigned long long (*rdev_size_change
)(struct md_rdev
*rdev
,
947 sector_t num_sectors
);
948 int (*allow_new_offset
)(struct md_rdev
*rdev
,
949 unsigned long long new_offset
);
953 * Check that the given mddev has no bitmap.
955 * This function is called from the run method of all personalities that do not
956 * support bitmaps. It prints an error message and returns non-zero if mddev
957 * has a bitmap. Otherwise, it returns 0.
960 int md_check_no_bitmap(struct mddev
*mddev
)
962 if (!mddev
->bitmap_info
.file
&& !mddev
->bitmap_info
.offset
)
964 pr_warn("%s: bitmaps are not supported for %s\n",
965 mdname(mddev
), mddev
->pers
->name
);
968 EXPORT_SYMBOL(md_check_no_bitmap
);
971 * load_super for 0.90.0
973 static int super_90_load(struct md_rdev
*rdev
, struct md_rdev
*refdev
, int minor_version
)
975 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
980 * Calculate the position of the superblock (512byte sectors),
981 * it's at the end of the disk.
983 * It also happens to be a multiple of 4Kb.
985 rdev
->sb_start
= calc_dev_sboffset(rdev
);
987 ret
= read_disk_sb(rdev
, MD_SB_BYTES
);
993 bdevname(rdev
->bdev
, b
);
994 sb
= page_address(rdev
->sb_page
);
996 if (sb
->md_magic
!= MD_SB_MAGIC
) {
997 pr_warn("md: invalid raid superblock magic on %s\n", b
);
1001 if (sb
->major_version
!= 0 ||
1002 sb
->minor_version
< 90 ||
1003 sb
->minor_version
> 91) {
1004 pr_warn("Bad version number %d.%d on %s\n",
1005 sb
->major_version
, sb
->minor_version
, b
);
1009 if (sb
->raid_disks
<= 0)
1012 if (md_csum_fold(calc_sb_csum(sb
)) != md_csum_fold(sb
->sb_csum
)) {
1013 pr_warn("md: invalid superblock checksum on %s\n", b
);
1017 rdev
->preferred_minor
= sb
->md_minor
;
1018 rdev
->data_offset
= 0;
1019 rdev
->new_data_offset
= 0;
1020 rdev
->sb_size
= MD_SB_BYTES
;
1021 rdev
->badblocks
.shift
= -1;
1023 if (sb
->level
== LEVEL_MULTIPATH
)
1026 rdev
->desc_nr
= sb
->this_disk
.number
;
1032 mdp_super_t
*refsb
= page_address(refdev
->sb_page
);
1033 if (!uuid_equal(refsb
, sb
)) {
1034 pr_warn("md: %s has different UUID to %s\n",
1035 b
, bdevname(refdev
->bdev
,b2
));
1038 if (!sb_equal(refsb
, sb
)) {
1039 pr_warn("md: %s has same UUID but different superblock to %s\n",
1040 b
, bdevname(refdev
->bdev
, b2
));
1044 ev2
= md_event(refsb
);
1050 rdev
->sectors
= rdev
->sb_start
;
1051 /* Limit to 4TB as metadata cannot record more than that.
1052 * (not needed for Linear and RAID0 as metadata doesn't
1055 if (IS_ENABLED(CONFIG_LBDAF
) && (u64
)rdev
->sectors
>= (2ULL << 32) &&
1057 rdev
->sectors
= (sector_t
)(2ULL << 32) - 2;
1059 if (rdev
->sectors
< ((sector_t
)sb
->size
) * 2 && sb
->level
>= 1)
1060 /* "this cannot possibly happen" ... */
1068 * validate_super for 0.90.0
1070 static int super_90_validate(struct mddev
*mddev
, struct md_rdev
*rdev
)
1073 mdp_super_t
*sb
= page_address(rdev
->sb_page
);
1074 __u64 ev1
= md_event(sb
);
1076 rdev
->raid_disk
= -1;
1077 clear_bit(Faulty
, &rdev
->flags
);
1078 clear_bit(In_sync
, &rdev
->flags
);
1079 clear_bit(Bitmap_sync
, &rdev
->flags
);
1080 clear_bit(WriteMostly
, &rdev
->flags
);
1082 if (mddev
->raid_disks
== 0) {
1083 mddev
->major_version
= 0;
1084 mddev
->minor_version
= sb
->minor_version
;
1085 mddev
->patch_version
= sb
->patch_version
;
1086 mddev
->external
= 0;
1087 mddev
->chunk_sectors
= sb
->chunk_size
>> 9;
1088 mddev
->ctime
= sb
->ctime
;
1089 mddev
->utime
= sb
->utime
;
1090 mddev
->level
= sb
->level
;
1091 mddev
->clevel
[0] = 0;
1092 mddev
->layout
= sb
->layout
;
1093 mddev
->raid_disks
= sb
->raid_disks
;
1094 mddev
->dev_sectors
= ((sector_t
)sb
->size
) * 2;
1095 mddev
->events
= ev1
;
1096 mddev
->bitmap_info
.offset
= 0;
1097 mddev
->bitmap_info
.space
= 0;
1098 /* bitmap can use 60 K after the 4K superblocks */
1099 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
1100 mddev
->bitmap_info
.default_space
= 64*2 - (MD_SB_BYTES
>> 9);
1101 mddev
->reshape_backwards
= 0;
1103 if (mddev
->minor_version
>= 91) {
1104 mddev
->reshape_position
= sb
->reshape_position
;
1105 mddev
->delta_disks
= sb
->delta_disks
;
1106 mddev
->new_level
= sb
->new_level
;
1107 mddev
->new_layout
= sb
->new_layout
;
1108 mddev
->new_chunk_sectors
= sb
->new_chunk
>> 9;
1109 if (mddev
->delta_disks
< 0)
1110 mddev
->reshape_backwards
= 1;
1112 mddev
->reshape_position
= MaxSector
;
1113 mddev
->delta_disks
= 0;
1114 mddev
->new_level
= mddev
->level
;
1115 mddev
->new_layout
= mddev
->layout
;
1116 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1119 if (sb
->state
& (1<<MD_SB_CLEAN
))
1120 mddev
->recovery_cp
= MaxSector
;
1122 if (sb
->events_hi
== sb
->cp_events_hi
&&
1123 sb
->events_lo
== sb
->cp_events_lo
) {
1124 mddev
->recovery_cp
= sb
->recovery_cp
;
1126 mddev
->recovery_cp
= 0;
1129 memcpy(mddev
->uuid
+0, &sb
->set_uuid0
, 4);
1130 memcpy(mddev
->uuid
+4, &sb
->set_uuid1
, 4);
1131 memcpy(mddev
->uuid
+8, &sb
->set_uuid2
, 4);
1132 memcpy(mddev
->uuid
+12,&sb
->set_uuid3
, 4);
1134 mddev
->max_disks
= MD_SB_DISKS
;
1136 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
) &&
1137 mddev
->bitmap_info
.file
== NULL
) {
1138 mddev
->bitmap_info
.offset
=
1139 mddev
->bitmap_info
.default_offset
;
1140 mddev
->bitmap_info
.space
=
1141 mddev
->bitmap_info
.default_space
;
1144 } else if (mddev
->pers
== NULL
) {
1145 /* Insist on good event counter while assembling, except
1146 * for spares (which don't need an event count) */
1148 if (sb
->disks
[rdev
->desc_nr
].state
& (
1149 (1<<MD_DISK_SYNC
) | (1 << MD_DISK_ACTIVE
)))
1150 if (ev1
< mddev
->events
)
1152 } else if (mddev
->bitmap
) {
1153 /* if adding to array with a bitmap, then we can accept an
1154 * older device ... but not too old.
1156 if (ev1
< mddev
->bitmap
->events_cleared
)
1158 if (ev1
< mddev
->events
)
1159 set_bit(Bitmap_sync
, &rdev
->flags
);
1161 if (ev1
< mddev
->events
)
1162 /* just a hot-add of a new device, leave raid_disk at -1 */
1166 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1167 desc
= sb
->disks
+ rdev
->desc_nr
;
1169 if (desc
->state
& (1<<MD_DISK_FAULTY
))
1170 set_bit(Faulty
, &rdev
->flags
);
1171 else if (desc
->state
& (1<<MD_DISK_SYNC
) /* &&
1172 desc->raid_disk < mddev->raid_disks */) {
1173 set_bit(In_sync
, &rdev
->flags
);
1174 rdev
->raid_disk
= desc
->raid_disk
;
1175 rdev
->saved_raid_disk
= desc
->raid_disk
;
1176 } else if (desc
->state
& (1<<MD_DISK_ACTIVE
)) {
1177 /* active but not in sync implies recovery up to
1178 * reshape position. We don't know exactly where
1179 * that is, so set to zero for now */
1180 if (mddev
->minor_version
>= 91) {
1181 rdev
->recovery_offset
= 0;
1182 rdev
->raid_disk
= desc
->raid_disk
;
1185 if (desc
->state
& (1<<MD_DISK_WRITEMOSTLY
))
1186 set_bit(WriteMostly
, &rdev
->flags
);
1187 if (desc
->state
& (1<<MD_DISK_FAILFAST
))
1188 set_bit(FailFast
, &rdev
->flags
);
1189 } else /* MULTIPATH are always insync */
1190 set_bit(In_sync
, &rdev
->flags
);
1195 * sync_super for 0.90.0
1197 static void super_90_sync(struct mddev
*mddev
, struct md_rdev
*rdev
)
1200 struct md_rdev
*rdev2
;
1201 int next_spare
= mddev
->raid_disks
;
1203 /* make rdev->sb match mddev data..
1206 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1207 * 3/ any empty disks < next_spare become removed
1209 * disks[0] gets initialised to REMOVED because
1210 * we cannot be sure from other fields if it has
1211 * been initialised or not.
1214 int active
=0, working
=0,failed
=0,spare
=0,nr_disks
=0;
1216 rdev
->sb_size
= MD_SB_BYTES
;
1218 sb
= page_address(rdev
->sb_page
);
1220 memset(sb
, 0, sizeof(*sb
));
1222 sb
->md_magic
= MD_SB_MAGIC
;
1223 sb
->major_version
= mddev
->major_version
;
1224 sb
->patch_version
= mddev
->patch_version
;
1225 sb
->gvalid_words
= 0; /* ignored */
1226 memcpy(&sb
->set_uuid0
, mddev
->uuid
+0, 4);
1227 memcpy(&sb
->set_uuid1
, mddev
->uuid
+4, 4);
1228 memcpy(&sb
->set_uuid2
, mddev
->uuid
+8, 4);
1229 memcpy(&sb
->set_uuid3
, mddev
->uuid
+12,4);
1231 sb
->ctime
= clamp_t(time64_t
, mddev
->ctime
, 0, U32_MAX
);
1232 sb
->level
= mddev
->level
;
1233 sb
->size
= mddev
->dev_sectors
/ 2;
1234 sb
->raid_disks
= mddev
->raid_disks
;
1235 sb
->md_minor
= mddev
->md_minor
;
1236 sb
->not_persistent
= 0;
1237 sb
->utime
= clamp_t(time64_t
, mddev
->utime
, 0, U32_MAX
);
1239 sb
->events_hi
= (mddev
->events
>>32);
1240 sb
->events_lo
= (u32
)mddev
->events
;
1242 if (mddev
->reshape_position
== MaxSector
)
1243 sb
->minor_version
= 90;
1245 sb
->minor_version
= 91;
1246 sb
->reshape_position
= mddev
->reshape_position
;
1247 sb
->new_level
= mddev
->new_level
;
1248 sb
->delta_disks
= mddev
->delta_disks
;
1249 sb
->new_layout
= mddev
->new_layout
;
1250 sb
->new_chunk
= mddev
->new_chunk_sectors
<< 9;
1252 mddev
->minor_version
= sb
->minor_version
;
1255 sb
->recovery_cp
= mddev
->recovery_cp
;
1256 sb
->cp_events_hi
= (mddev
->events
>>32);
1257 sb
->cp_events_lo
= (u32
)mddev
->events
;
1258 if (mddev
->recovery_cp
== MaxSector
)
1259 sb
->state
= (1<< MD_SB_CLEAN
);
1261 sb
->recovery_cp
= 0;
1263 sb
->layout
= mddev
->layout
;
1264 sb
->chunk_size
= mddev
->chunk_sectors
<< 9;
1266 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
)
1267 sb
->state
|= (1<<MD_SB_BITMAP_PRESENT
);
1269 sb
->disks
[0].state
= (1<<MD_DISK_REMOVED
);
1270 rdev_for_each(rdev2
, mddev
) {
1273 int is_active
= test_bit(In_sync
, &rdev2
->flags
);
1275 if (rdev2
->raid_disk
>= 0 &&
1276 sb
->minor_version
>= 91)
1277 /* we have nowhere to store the recovery_offset,
1278 * but if it is not below the reshape_position,
1279 * we can piggy-back on that.
1282 if (rdev2
->raid_disk
< 0 ||
1283 test_bit(Faulty
, &rdev2
->flags
))
1286 desc_nr
= rdev2
->raid_disk
;
1288 desc_nr
= next_spare
++;
1289 rdev2
->desc_nr
= desc_nr
;
1290 d
= &sb
->disks
[rdev2
->desc_nr
];
1292 d
->number
= rdev2
->desc_nr
;
1293 d
->major
= MAJOR(rdev2
->bdev
->bd_dev
);
1294 d
->minor
= MINOR(rdev2
->bdev
->bd_dev
);
1296 d
->raid_disk
= rdev2
->raid_disk
;
1298 d
->raid_disk
= rdev2
->desc_nr
; /* compatibility */
1299 if (test_bit(Faulty
, &rdev2
->flags
))
1300 d
->state
= (1<<MD_DISK_FAULTY
);
1301 else if (is_active
) {
1302 d
->state
= (1<<MD_DISK_ACTIVE
);
1303 if (test_bit(In_sync
, &rdev2
->flags
))
1304 d
->state
|= (1<<MD_DISK_SYNC
);
1312 if (test_bit(WriteMostly
, &rdev2
->flags
))
1313 d
->state
|= (1<<MD_DISK_WRITEMOSTLY
);
1314 if (test_bit(FailFast
, &rdev2
->flags
))
1315 d
->state
|= (1<<MD_DISK_FAILFAST
);
1317 /* now set the "removed" and "faulty" bits on any missing devices */
1318 for (i
=0 ; i
< mddev
->raid_disks
; i
++) {
1319 mdp_disk_t
*d
= &sb
->disks
[i
];
1320 if (d
->state
== 0 && d
->number
== 0) {
1323 d
->state
= (1<<MD_DISK_REMOVED
);
1324 d
->state
|= (1<<MD_DISK_FAULTY
);
1328 sb
->nr_disks
= nr_disks
;
1329 sb
->active_disks
= active
;
1330 sb
->working_disks
= working
;
1331 sb
->failed_disks
= failed
;
1332 sb
->spare_disks
= spare
;
1334 sb
->this_disk
= sb
->disks
[rdev
->desc_nr
];
1335 sb
->sb_csum
= calc_sb_csum(sb
);
1339 * rdev_size_change for 0.90.0
1341 static unsigned long long
1342 super_90_rdev_size_change(struct md_rdev
*rdev
, sector_t num_sectors
)
1344 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1345 return 0; /* component must fit device */
1346 if (rdev
->mddev
->bitmap_info
.offset
)
1347 return 0; /* can't move bitmap */
1348 rdev
->sb_start
= calc_dev_sboffset(rdev
);
1349 if (!num_sectors
|| num_sectors
> rdev
->sb_start
)
1350 num_sectors
= rdev
->sb_start
;
1351 /* Limit to 4TB as metadata cannot record more than that.
1352 * 4TB == 2^32 KB, or 2*2^32 sectors.
1354 if (IS_ENABLED(CONFIG_LBDAF
) && (u64
)num_sectors
>= (2ULL << 32) &&
1355 rdev
->mddev
->level
>= 1)
1356 num_sectors
= (sector_t
)(2ULL << 32) - 2;
1358 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1360 } while (md_super_wait(rdev
->mddev
) < 0);
1365 super_90_allow_new_offset(struct md_rdev
*rdev
, unsigned long long new_offset
)
1367 /* non-zero offset changes not possible with v0.90 */
1368 return new_offset
== 0;
1372 * version 1 superblock
1375 static __le32
calc_sb_1_csum(struct mdp_superblock_1
*sb
)
1379 unsigned long long newcsum
;
1380 int size
= 256 + le32_to_cpu(sb
->max_dev
)*2;
1381 __le32
*isuper
= (__le32
*)sb
;
1383 disk_csum
= sb
->sb_csum
;
1386 for (; size
>= 4; size
-= 4)
1387 newcsum
+= le32_to_cpu(*isuper
++);
1390 newcsum
+= le16_to_cpu(*(__le16
*) isuper
);
1392 csum
= (newcsum
& 0xffffffff) + (newcsum
>> 32);
1393 sb
->sb_csum
= disk_csum
;
1394 return cpu_to_le32(csum
);
1397 static int super_1_load(struct md_rdev
*rdev
, struct md_rdev
*refdev
, int minor_version
)
1399 struct mdp_superblock_1
*sb
;
1403 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1407 * Calculate the position of the superblock in 512byte sectors.
1408 * It is always aligned to a 4K boundary and
1409 * depeding on minor_version, it can be:
1410 * 0: At least 8K, but less than 12K, from end of device
1411 * 1: At start of device
1412 * 2: 4K from start of device.
1414 switch(minor_version
) {
1416 sb_start
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1418 sb_start
&= ~(sector_t
)(4*2-1);
1429 rdev
->sb_start
= sb_start
;
1431 /* superblock is rarely larger than 1K, but it can be larger,
1432 * and it is safe to read 4k, so we do that
1434 ret
= read_disk_sb(rdev
, 4096);
1435 if (ret
) return ret
;
1437 sb
= page_address(rdev
->sb_page
);
1439 if (sb
->magic
!= cpu_to_le32(MD_SB_MAGIC
) ||
1440 sb
->major_version
!= cpu_to_le32(1) ||
1441 le32_to_cpu(sb
->max_dev
) > (4096-256)/2 ||
1442 le64_to_cpu(sb
->super_offset
) != rdev
->sb_start
||
1443 (le32_to_cpu(sb
->feature_map
) & ~MD_FEATURE_ALL
) != 0)
1446 if (calc_sb_1_csum(sb
) != sb
->sb_csum
) {
1447 pr_warn("md: invalid superblock checksum on %s\n",
1448 bdevname(rdev
->bdev
,b
));
1451 if (le64_to_cpu(sb
->data_size
) < 10) {
1452 pr_warn("md: data_size too small on %s\n",
1453 bdevname(rdev
->bdev
,b
));
1458 memcmp(sb
->pad3
, sb
->pad3
+1, sizeof(sb
->pad3
) - sizeof(sb
->pad3
[1])))
1459 /* Some padding is non-zero, might be a new feature */
1462 rdev
->preferred_minor
= 0xffff;
1463 rdev
->data_offset
= le64_to_cpu(sb
->data_offset
);
1464 rdev
->new_data_offset
= rdev
->data_offset
;
1465 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
) &&
1466 (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_NEW_OFFSET
))
1467 rdev
->new_data_offset
+= (s32
)le32_to_cpu(sb
->new_offset
);
1468 atomic_set(&rdev
->corrected_errors
, le32_to_cpu(sb
->cnt_corrected_read
));
1470 rdev
->sb_size
= le32_to_cpu(sb
->max_dev
) * 2 + 256;
1471 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1472 if (rdev
->sb_size
& bmask
)
1473 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1476 && rdev
->data_offset
< sb_start
+ (rdev
->sb_size
/512))
1479 && rdev
->new_data_offset
< sb_start
+ (rdev
->sb_size
/512))
1482 if (sb
->level
== cpu_to_le32(LEVEL_MULTIPATH
))
1485 rdev
->desc_nr
= le32_to_cpu(sb
->dev_number
);
1487 if (!rdev
->bb_page
) {
1488 rdev
->bb_page
= alloc_page(GFP_KERNEL
);
1492 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BAD_BLOCKS
) &&
1493 rdev
->badblocks
.count
== 0) {
1494 /* need to load the bad block list.
1495 * Currently we limit it to one page.
1501 int sectors
= le16_to_cpu(sb
->bblog_size
);
1502 if (sectors
> (PAGE_SIZE
/ 512))
1504 offset
= le32_to_cpu(sb
->bblog_offset
);
1507 bb_sector
= (long long)offset
;
1508 if (!sync_page_io(rdev
, bb_sector
, sectors
<< 9,
1509 rdev
->bb_page
, REQ_OP_READ
, 0, true))
1511 bbp
= (u64
*)page_address(rdev
->bb_page
);
1512 rdev
->badblocks
.shift
= sb
->bblog_shift
;
1513 for (i
= 0 ; i
< (sectors
<< (9-3)) ; i
++, bbp
++) {
1514 u64 bb
= le64_to_cpu(*bbp
);
1515 int count
= bb
& (0x3ff);
1516 u64 sector
= bb
>> 10;
1517 sector
<<= sb
->bblog_shift
;
1518 count
<<= sb
->bblog_shift
;
1521 if (badblocks_set(&rdev
->badblocks
, sector
, count
, 1))
1524 } else if (sb
->bblog_offset
!= 0)
1525 rdev
->badblocks
.shift
= 0;
1527 if (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_PPL
) {
1528 rdev
->ppl
.offset
= (__s16
)le16_to_cpu(sb
->ppl
.offset
);
1529 rdev
->ppl
.size
= le16_to_cpu(sb
->ppl
.size
);
1530 rdev
->ppl
.sector
= rdev
->sb_start
+ rdev
->ppl
.offset
;
1537 struct mdp_superblock_1
*refsb
= page_address(refdev
->sb_page
);
1539 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16) != 0 ||
1540 sb
->level
!= refsb
->level
||
1541 sb
->layout
!= refsb
->layout
||
1542 sb
->chunksize
!= refsb
->chunksize
) {
1543 pr_warn("md: %s has strangely different superblock to %s\n",
1544 bdevname(rdev
->bdev
,b
),
1545 bdevname(refdev
->bdev
,b2
));
1548 ev1
= le64_to_cpu(sb
->events
);
1549 ev2
= le64_to_cpu(refsb
->events
);
1556 if (minor_version
) {
1557 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9);
1558 sectors
-= rdev
->data_offset
;
1560 sectors
= rdev
->sb_start
;
1561 if (sectors
< le64_to_cpu(sb
->data_size
))
1563 rdev
->sectors
= le64_to_cpu(sb
->data_size
);
1567 static int super_1_validate(struct mddev
*mddev
, struct md_rdev
*rdev
)
1569 struct mdp_superblock_1
*sb
= page_address(rdev
->sb_page
);
1570 __u64 ev1
= le64_to_cpu(sb
->events
);
1572 rdev
->raid_disk
= -1;
1573 clear_bit(Faulty
, &rdev
->flags
);
1574 clear_bit(In_sync
, &rdev
->flags
);
1575 clear_bit(Bitmap_sync
, &rdev
->flags
);
1576 clear_bit(WriteMostly
, &rdev
->flags
);
1578 if (mddev
->raid_disks
== 0) {
1579 mddev
->major_version
= 1;
1580 mddev
->patch_version
= 0;
1581 mddev
->external
= 0;
1582 mddev
->chunk_sectors
= le32_to_cpu(sb
->chunksize
);
1583 mddev
->ctime
= le64_to_cpu(sb
->ctime
);
1584 mddev
->utime
= le64_to_cpu(sb
->utime
);
1585 mddev
->level
= le32_to_cpu(sb
->level
);
1586 mddev
->clevel
[0] = 0;
1587 mddev
->layout
= le32_to_cpu(sb
->layout
);
1588 mddev
->raid_disks
= le32_to_cpu(sb
->raid_disks
);
1589 mddev
->dev_sectors
= le64_to_cpu(sb
->size
);
1590 mddev
->events
= ev1
;
1591 mddev
->bitmap_info
.offset
= 0;
1592 mddev
->bitmap_info
.space
= 0;
1593 /* Default location for bitmap is 1K after superblock
1594 * using 3K - total of 4K
1596 mddev
->bitmap_info
.default_offset
= 1024 >> 9;
1597 mddev
->bitmap_info
.default_space
= (4096-1024) >> 9;
1598 mddev
->reshape_backwards
= 0;
1600 mddev
->recovery_cp
= le64_to_cpu(sb
->resync_offset
);
1601 memcpy(mddev
->uuid
, sb
->set_uuid
, 16);
1603 mddev
->max_disks
= (4096-256)/2;
1605 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
) &&
1606 mddev
->bitmap_info
.file
== NULL
) {
1607 mddev
->bitmap_info
.offset
=
1608 (__s32
)le32_to_cpu(sb
->bitmap_offset
);
1609 /* Metadata doesn't record how much space is available.
1610 * For 1.0, we assume we can use up to the superblock
1611 * if before, else to 4K beyond superblock.
1612 * For others, assume no change is possible.
1614 if (mddev
->minor_version
> 0)
1615 mddev
->bitmap_info
.space
= 0;
1616 else if (mddev
->bitmap_info
.offset
> 0)
1617 mddev
->bitmap_info
.space
=
1618 8 - mddev
->bitmap_info
.offset
;
1620 mddev
->bitmap_info
.space
=
1621 -mddev
->bitmap_info
.offset
;
1624 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
1625 mddev
->reshape_position
= le64_to_cpu(sb
->reshape_position
);
1626 mddev
->delta_disks
= le32_to_cpu(sb
->delta_disks
);
1627 mddev
->new_level
= le32_to_cpu(sb
->new_level
);
1628 mddev
->new_layout
= le32_to_cpu(sb
->new_layout
);
1629 mddev
->new_chunk_sectors
= le32_to_cpu(sb
->new_chunk
);
1630 if (mddev
->delta_disks
< 0 ||
1631 (mddev
->delta_disks
== 0 &&
1632 (le32_to_cpu(sb
->feature_map
)
1633 & MD_FEATURE_RESHAPE_BACKWARDS
)))
1634 mddev
->reshape_backwards
= 1;
1636 mddev
->reshape_position
= MaxSector
;
1637 mddev
->delta_disks
= 0;
1638 mddev
->new_level
= mddev
->level
;
1639 mddev
->new_layout
= mddev
->layout
;
1640 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1643 if (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_JOURNAL
)
1644 set_bit(MD_HAS_JOURNAL
, &mddev
->flags
);
1646 if (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_PPL
) {
1647 if (le32_to_cpu(sb
->feature_map
) &
1648 (MD_FEATURE_BITMAP_OFFSET
| MD_FEATURE_JOURNAL
))
1650 set_bit(MD_HAS_PPL
, &mddev
->flags
);
1652 } else if (mddev
->pers
== NULL
) {
1653 /* Insist of good event counter while assembling, except for
1654 * spares (which don't need an event count) */
1656 if (rdev
->desc_nr
>= 0 &&
1657 rdev
->desc_nr
< le32_to_cpu(sb
->max_dev
) &&
1658 (le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]) < MD_DISK_ROLE_MAX
||
1659 le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]) == MD_DISK_ROLE_JOURNAL
))
1660 if (ev1
< mddev
->events
)
1662 } else if (mddev
->bitmap
) {
1663 /* If adding to array with a bitmap, then we can accept an
1664 * older device, but not too old.
1666 if (ev1
< mddev
->bitmap
->events_cleared
)
1668 if (ev1
< mddev
->events
)
1669 set_bit(Bitmap_sync
, &rdev
->flags
);
1671 if (ev1
< mddev
->events
)
1672 /* just a hot-add of a new device, leave raid_disk at -1 */
1675 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1677 if (rdev
->desc_nr
< 0 ||
1678 rdev
->desc_nr
>= le32_to_cpu(sb
->max_dev
)) {
1679 role
= MD_DISK_ROLE_SPARE
;
1682 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
1684 case MD_DISK_ROLE_SPARE
: /* spare */
1686 case MD_DISK_ROLE_FAULTY
: /* faulty */
1687 set_bit(Faulty
, &rdev
->flags
);
1689 case MD_DISK_ROLE_JOURNAL
: /* journal device */
1690 if (!(le32_to_cpu(sb
->feature_map
) & MD_FEATURE_JOURNAL
)) {
1691 /* journal device without journal feature */
1692 pr_warn("md: journal device provided without journal feature, ignoring the device\n");
1695 set_bit(Journal
, &rdev
->flags
);
1696 rdev
->journal_tail
= le64_to_cpu(sb
->journal_tail
);
1697 rdev
->raid_disk
= 0;
1700 rdev
->saved_raid_disk
= role
;
1701 if ((le32_to_cpu(sb
->feature_map
) &
1702 MD_FEATURE_RECOVERY_OFFSET
)) {
1703 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
1704 if (!(le32_to_cpu(sb
->feature_map
) &
1705 MD_FEATURE_RECOVERY_BITMAP
))
1706 rdev
->saved_raid_disk
= -1;
1708 set_bit(In_sync
, &rdev
->flags
);
1709 rdev
->raid_disk
= role
;
1712 if (sb
->devflags
& WriteMostly1
)
1713 set_bit(WriteMostly
, &rdev
->flags
);
1714 if (sb
->devflags
& FailFast1
)
1715 set_bit(FailFast
, &rdev
->flags
);
1716 if (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_REPLACEMENT
)
1717 set_bit(Replacement
, &rdev
->flags
);
1718 } else /* MULTIPATH are always insync */
1719 set_bit(In_sync
, &rdev
->flags
);
1724 static void super_1_sync(struct mddev
*mddev
, struct md_rdev
*rdev
)
1726 struct mdp_superblock_1
*sb
;
1727 struct md_rdev
*rdev2
;
1729 /* make rdev->sb match mddev and rdev data. */
1731 sb
= page_address(rdev
->sb_page
);
1733 sb
->feature_map
= 0;
1735 sb
->recovery_offset
= cpu_to_le64(0);
1736 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
1738 sb
->utime
= cpu_to_le64((__u64
)mddev
->utime
);
1739 sb
->events
= cpu_to_le64(mddev
->events
);
1741 sb
->resync_offset
= cpu_to_le64(mddev
->recovery_cp
);
1742 else if (test_bit(MD_JOURNAL_CLEAN
, &mddev
->flags
))
1743 sb
->resync_offset
= cpu_to_le64(MaxSector
);
1745 sb
->resync_offset
= cpu_to_le64(0);
1747 sb
->cnt_corrected_read
= cpu_to_le32(atomic_read(&rdev
->corrected_errors
));
1749 sb
->raid_disks
= cpu_to_le32(mddev
->raid_disks
);
1750 sb
->size
= cpu_to_le64(mddev
->dev_sectors
);
1751 sb
->chunksize
= cpu_to_le32(mddev
->chunk_sectors
);
1752 sb
->level
= cpu_to_le32(mddev
->level
);
1753 sb
->layout
= cpu_to_le32(mddev
->layout
);
1754 if (test_bit(FailFast
, &rdev
->flags
))
1755 sb
->devflags
|= FailFast1
;
1757 sb
->devflags
&= ~FailFast1
;
1759 if (test_bit(WriteMostly
, &rdev
->flags
))
1760 sb
->devflags
|= WriteMostly1
;
1762 sb
->devflags
&= ~WriteMostly1
;
1763 sb
->data_offset
= cpu_to_le64(rdev
->data_offset
);
1764 sb
->data_size
= cpu_to_le64(rdev
->sectors
);
1766 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
) {
1767 sb
->bitmap_offset
= cpu_to_le32((__u32
)mddev
->bitmap_info
.offset
);
1768 sb
->feature_map
= cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
);
1771 if (rdev
->raid_disk
>= 0 && !test_bit(Journal
, &rdev
->flags
) &&
1772 !test_bit(In_sync
, &rdev
->flags
)) {
1774 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET
);
1775 sb
->recovery_offset
=
1776 cpu_to_le64(rdev
->recovery_offset
);
1777 if (rdev
->saved_raid_disk
>= 0 && mddev
->bitmap
)
1779 cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP
);
1781 /* Note: recovery_offset and journal_tail share space */
1782 if (test_bit(Journal
, &rdev
->flags
))
1783 sb
->journal_tail
= cpu_to_le64(rdev
->journal_tail
);
1784 if (test_bit(Replacement
, &rdev
->flags
))
1786 cpu_to_le32(MD_FEATURE_REPLACEMENT
);
1788 if (mddev
->reshape_position
!= MaxSector
) {
1789 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE
);
1790 sb
->reshape_position
= cpu_to_le64(mddev
->reshape_position
);
1791 sb
->new_layout
= cpu_to_le32(mddev
->new_layout
);
1792 sb
->delta_disks
= cpu_to_le32(mddev
->delta_disks
);
1793 sb
->new_level
= cpu_to_le32(mddev
->new_level
);
1794 sb
->new_chunk
= cpu_to_le32(mddev
->new_chunk_sectors
);
1795 if (mddev
->delta_disks
== 0 &&
1796 mddev
->reshape_backwards
)
1798 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS
);
1799 if (rdev
->new_data_offset
!= rdev
->data_offset
) {
1801 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET
);
1802 sb
->new_offset
= cpu_to_le32((__u32
)(rdev
->new_data_offset
1803 - rdev
->data_offset
));
1807 if (mddev_is_clustered(mddev
))
1808 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_CLUSTERED
);
1810 if (rdev
->badblocks
.count
== 0)
1811 /* Nothing to do for bad blocks*/ ;
1812 else if (sb
->bblog_offset
== 0)
1813 /* Cannot record bad blocks on this device */
1814 md_error(mddev
, rdev
);
1816 struct badblocks
*bb
= &rdev
->badblocks
;
1817 u64
*bbp
= (u64
*)page_address(rdev
->bb_page
);
1819 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_BAD_BLOCKS
);
1824 seq
= read_seqbegin(&bb
->lock
);
1826 memset(bbp
, 0xff, PAGE_SIZE
);
1828 for (i
= 0 ; i
< bb
->count
; i
++) {
1829 u64 internal_bb
= p
[i
];
1830 u64 store_bb
= ((BB_OFFSET(internal_bb
) << 10)
1831 | BB_LEN(internal_bb
));
1832 bbp
[i
] = cpu_to_le64(store_bb
);
1835 if (read_seqretry(&bb
->lock
, seq
))
1838 bb
->sector
= (rdev
->sb_start
+
1839 (int)le32_to_cpu(sb
->bblog_offset
));
1840 bb
->size
= le16_to_cpu(sb
->bblog_size
);
1845 rdev_for_each(rdev2
, mddev
)
1846 if (rdev2
->desc_nr
+1 > max_dev
)
1847 max_dev
= rdev2
->desc_nr
+1;
1849 if (max_dev
> le32_to_cpu(sb
->max_dev
)) {
1851 sb
->max_dev
= cpu_to_le32(max_dev
);
1852 rdev
->sb_size
= max_dev
* 2 + 256;
1853 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1854 if (rdev
->sb_size
& bmask
)
1855 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1857 max_dev
= le32_to_cpu(sb
->max_dev
);
1859 for (i
=0; i
<max_dev
;i
++)
1860 sb
->dev_roles
[i
] = cpu_to_le16(MD_DISK_ROLE_FAULTY
);
1862 if (test_bit(MD_HAS_JOURNAL
, &mddev
->flags
))
1863 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_JOURNAL
);
1865 if (test_bit(MD_HAS_PPL
, &mddev
->flags
)) {
1866 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_PPL
);
1867 sb
->ppl
.offset
= cpu_to_le16(rdev
->ppl
.offset
);
1868 sb
->ppl
.size
= cpu_to_le16(rdev
->ppl
.size
);
1871 rdev_for_each(rdev2
, mddev
) {
1873 if (test_bit(Faulty
, &rdev2
->flags
))
1874 sb
->dev_roles
[i
] = cpu_to_le16(MD_DISK_ROLE_FAULTY
);
1875 else if (test_bit(In_sync
, &rdev2
->flags
))
1876 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1877 else if (test_bit(Journal
, &rdev2
->flags
))
1878 sb
->dev_roles
[i
] = cpu_to_le16(MD_DISK_ROLE_JOURNAL
);
1879 else if (rdev2
->raid_disk
>= 0)
1880 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1882 sb
->dev_roles
[i
] = cpu_to_le16(MD_DISK_ROLE_SPARE
);
1885 sb
->sb_csum
= calc_sb_1_csum(sb
);
1888 static unsigned long long
1889 super_1_rdev_size_change(struct md_rdev
*rdev
, sector_t num_sectors
)
1891 struct mdp_superblock_1
*sb
;
1892 sector_t max_sectors
;
1893 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1894 return 0; /* component must fit device */
1895 if (rdev
->data_offset
!= rdev
->new_data_offset
)
1896 return 0; /* too confusing */
1897 if (rdev
->sb_start
< rdev
->data_offset
) {
1898 /* minor versions 1 and 2; superblock before data */
1899 max_sectors
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1900 max_sectors
-= rdev
->data_offset
;
1901 if (!num_sectors
|| num_sectors
> max_sectors
)
1902 num_sectors
= max_sectors
;
1903 } else if (rdev
->mddev
->bitmap_info
.offset
) {
1904 /* minor version 0 with bitmap we can't move */
1907 /* minor version 0; superblock after data */
1909 sb_start
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) - 8*2;
1910 sb_start
&= ~(sector_t
)(4*2 - 1);
1911 max_sectors
= rdev
->sectors
+ sb_start
- rdev
->sb_start
;
1912 if (!num_sectors
|| num_sectors
> max_sectors
)
1913 num_sectors
= max_sectors
;
1914 rdev
->sb_start
= sb_start
;
1916 sb
= page_address(rdev
->sb_page
);
1917 sb
->data_size
= cpu_to_le64(num_sectors
);
1918 sb
->super_offset
= cpu_to_le64(rdev
->sb_start
);
1919 sb
->sb_csum
= calc_sb_1_csum(sb
);
1921 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1923 } while (md_super_wait(rdev
->mddev
) < 0);
1929 super_1_allow_new_offset(struct md_rdev
*rdev
,
1930 unsigned long long new_offset
)
1932 /* All necessary checks on new >= old have been done */
1933 struct bitmap
*bitmap
;
1934 if (new_offset
>= rdev
->data_offset
)
1937 /* with 1.0 metadata, there is no metadata to tread on
1938 * so we can always move back */
1939 if (rdev
->mddev
->minor_version
== 0)
1942 /* otherwise we must be sure not to step on
1943 * any metadata, so stay:
1944 * 36K beyond start of superblock
1945 * beyond end of badblocks
1946 * beyond write-intent bitmap
1948 if (rdev
->sb_start
+ (32+4)*2 > new_offset
)
1950 bitmap
= rdev
->mddev
->bitmap
;
1951 if (bitmap
&& !rdev
->mddev
->bitmap_info
.file
&&
1952 rdev
->sb_start
+ rdev
->mddev
->bitmap_info
.offset
+
1953 bitmap
->storage
.file_pages
* (PAGE_SIZE
>>9) > new_offset
)
1955 if (rdev
->badblocks
.sector
+ rdev
->badblocks
.size
> new_offset
)
1961 static struct super_type super_types
[] = {
1964 .owner
= THIS_MODULE
,
1965 .load_super
= super_90_load
,
1966 .validate_super
= super_90_validate
,
1967 .sync_super
= super_90_sync
,
1968 .rdev_size_change
= super_90_rdev_size_change
,
1969 .allow_new_offset
= super_90_allow_new_offset
,
1973 .owner
= THIS_MODULE
,
1974 .load_super
= super_1_load
,
1975 .validate_super
= super_1_validate
,
1976 .sync_super
= super_1_sync
,
1977 .rdev_size_change
= super_1_rdev_size_change
,
1978 .allow_new_offset
= super_1_allow_new_offset
,
1982 static void sync_super(struct mddev
*mddev
, struct md_rdev
*rdev
)
1984 if (mddev
->sync_super
) {
1985 mddev
->sync_super(mddev
, rdev
);
1989 BUG_ON(mddev
->major_version
>= ARRAY_SIZE(super_types
));
1991 super_types
[mddev
->major_version
].sync_super(mddev
, rdev
);
1994 static int match_mddev_units(struct mddev
*mddev1
, struct mddev
*mddev2
)
1996 struct md_rdev
*rdev
, *rdev2
;
1999 rdev_for_each_rcu(rdev
, mddev1
) {
2000 if (test_bit(Faulty
, &rdev
->flags
) ||
2001 test_bit(Journal
, &rdev
->flags
) ||
2002 rdev
->raid_disk
== -1)
2004 rdev_for_each_rcu(rdev2
, mddev2
) {
2005 if (test_bit(Faulty
, &rdev2
->flags
) ||
2006 test_bit(Journal
, &rdev2
->flags
) ||
2007 rdev2
->raid_disk
== -1)
2009 if (rdev
->bdev
->bd_contains
==
2010 rdev2
->bdev
->bd_contains
) {
2020 static LIST_HEAD(pending_raid_disks
);
2023 * Try to register data integrity profile for an mddev
2025 * This is called when an array is started and after a disk has been kicked
2026 * from the array. It only succeeds if all working and active component devices
2027 * are integrity capable with matching profiles.
2029 int md_integrity_register(struct mddev
*mddev
)
2031 struct md_rdev
*rdev
, *reference
= NULL
;
2033 if (list_empty(&mddev
->disks
))
2034 return 0; /* nothing to do */
2035 if (!mddev
->gendisk
|| blk_get_integrity(mddev
->gendisk
))
2036 return 0; /* shouldn't register, or already is */
2037 rdev_for_each(rdev
, mddev
) {
2038 /* skip spares and non-functional disks */
2039 if (test_bit(Faulty
, &rdev
->flags
))
2041 if (rdev
->raid_disk
< 0)
2044 /* Use the first rdev as the reference */
2048 /* does this rdev's profile match the reference profile? */
2049 if (blk_integrity_compare(reference
->bdev
->bd_disk
,
2050 rdev
->bdev
->bd_disk
) < 0)
2053 if (!reference
|| !bdev_get_integrity(reference
->bdev
))
2056 * All component devices are integrity capable and have matching
2057 * profiles, register the common profile for the md device.
2059 blk_integrity_register(mddev
->gendisk
,
2060 bdev_get_integrity(reference
->bdev
));
2062 pr_debug("md: data integrity enabled on %s\n", mdname(mddev
));
2063 if (bioset_integrity_create(mddev
->bio_set
, BIO_POOL_SIZE
)) {
2064 pr_err("md: failed to create integrity pool for %s\n",
2070 EXPORT_SYMBOL(md_integrity_register
);
2073 * Attempt to add an rdev, but only if it is consistent with the current
2076 int md_integrity_add_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
2078 struct blk_integrity
*bi_rdev
;
2079 struct blk_integrity
*bi_mddev
;
2080 char name
[BDEVNAME_SIZE
];
2082 if (!mddev
->gendisk
)
2085 bi_rdev
= bdev_get_integrity(rdev
->bdev
);
2086 bi_mddev
= blk_get_integrity(mddev
->gendisk
);
2088 if (!bi_mddev
) /* nothing to do */
2091 if (blk_integrity_compare(mddev
->gendisk
, rdev
->bdev
->bd_disk
) != 0) {
2092 pr_err("%s: incompatible integrity profile for %s\n",
2093 mdname(mddev
), bdevname(rdev
->bdev
, name
));
2099 EXPORT_SYMBOL(md_integrity_add_rdev
);
2101 static int bind_rdev_to_array(struct md_rdev
*rdev
, struct mddev
*mddev
)
2103 char b
[BDEVNAME_SIZE
];
2107 /* prevent duplicates */
2108 if (find_rdev(mddev
, rdev
->bdev
->bd_dev
))
2111 if ((bdev_read_only(rdev
->bdev
) || bdev_read_only(rdev
->meta_bdev
)) &&
2115 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2116 if (!test_bit(Journal
, &rdev
->flags
) &&
2118 (mddev
->dev_sectors
== 0 || rdev
->sectors
< mddev
->dev_sectors
)) {
2120 /* Cannot change size, so fail
2121 * If mddev->level <= 0, then we don't care
2122 * about aligning sizes (e.g. linear)
2124 if (mddev
->level
> 0)
2127 mddev
->dev_sectors
= rdev
->sectors
;
2130 /* Verify rdev->desc_nr is unique.
2131 * If it is -1, assign a free number, else
2132 * check number is not in use
2135 if (rdev
->desc_nr
< 0) {
2138 choice
= mddev
->raid_disks
;
2139 while (md_find_rdev_nr_rcu(mddev
, choice
))
2141 rdev
->desc_nr
= choice
;
2143 if (md_find_rdev_nr_rcu(mddev
, rdev
->desc_nr
)) {
2149 if (!test_bit(Journal
, &rdev
->flags
) &&
2150 mddev
->max_disks
&& rdev
->desc_nr
>= mddev
->max_disks
) {
2151 pr_warn("md: %s: array is limited to %d devices\n",
2152 mdname(mddev
), mddev
->max_disks
);
2155 bdevname(rdev
->bdev
,b
);
2156 strreplace(b
, '/', '!');
2158 rdev
->mddev
= mddev
;
2159 pr_debug("md: bind<%s>\n", b
);
2161 if ((err
= kobject_add(&rdev
->kobj
, &mddev
->kobj
, "dev-%s", b
)))
2164 ko
= &part_to_dev(rdev
->bdev
->bd_part
)->kobj
;
2165 if (sysfs_create_link(&rdev
->kobj
, ko
, "block"))
2166 /* failure here is OK */;
2167 rdev
->sysfs_state
= sysfs_get_dirent_safe(rdev
->kobj
.sd
, "state");
2169 list_add_rcu(&rdev
->same_set
, &mddev
->disks
);
2170 bd_link_disk_holder(rdev
->bdev
, mddev
->gendisk
);
2172 /* May as well allow recovery to be retried once */
2173 mddev
->recovery_disabled
++;
2178 pr_warn("md: failed to register dev-%s for %s\n",
2183 static void md_delayed_delete(struct work_struct
*ws
)
2185 struct md_rdev
*rdev
= container_of(ws
, struct md_rdev
, del_work
);
2186 kobject_del(&rdev
->kobj
);
2187 kobject_put(&rdev
->kobj
);
2190 static void unbind_rdev_from_array(struct md_rdev
*rdev
)
2192 char b
[BDEVNAME_SIZE
];
2194 bd_unlink_disk_holder(rdev
->bdev
, rdev
->mddev
->gendisk
);
2195 list_del_rcu(&rdev
->same_set
);
2196 pr_debug("md: unbind<%s>\n", bdevname(rdev
->bdev
,b
));
2198 sysfs_remove_link(&rdev
->kobj
, "block");
2199 sysfs_put(rdev
->sysfs_state
);
2200 rdev
->sysfs_state
= NULL
;
2201 rdev
->badblocks
.count
= 0;
2202 /* We need to delay this, otherwise we can deadlock when
2203 * writing to 'remove' to "dev/state". We also need
2204 * to delay it due to rcu usage.
2207 INIT_WORK(&rdev
->del_work
, md_delayed_delete
);
2208 kobject_get(&rdev
->kobj
);
2209 queue_work(md_misc_wq
, &rdev
->del_work
);
2213 * prevent the device from being mounted, repartitioned or
2214 * otherwise reused by a RAID array (or any other kernel
2215 * subsystem), by bd_claiming the device.
2217 static int lock_rdev(struct md_rdev
*rdev
, dev_t dev
, int shared
)
2220 struct block_device
*bdev
;
2221 char b
[BDEVNAME_SIZE
];
2223 bdev
= blkdev_get_by_dev(dev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
,
2224 shared
? (struct md_rdev
*)lock_rdev
: rdev
);
2226 pr_warn("md: could not open %s.\n", __bdevname(dev
, b
));
2227 return PTR_ERR(bdev
);
2233 static void unlock_rdev(struct md_rdev
*rdev
)
2235 struct block_device
*bdev
= rdev
->bdev
;
2237 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
);
2240 void md_autodetect_dev(dev_t dev
);
2242 static void export_rdev(struct md_rdev
*rdev
)
2244 char b
[BDEVNAME_SIZE
];
2246 pr_debug("md: export_rdev(%s)\n", bdevname(rdev
->bdev
,b
));
2247 md_rdev_clear(rdev
);
2249 if (test_bit(AutoDetected
, &rdev
->flags
))
2250 md_autodetect_dev(rdev
->bdev
->bd_dev
);
2253 kobject_put(&rdev
->kobj
);
2256 void md_kick_rdev_from_array(struct md_rdev
*rdev
)
2258 unbind_rdev_from_array(rdev
);
2261 EXPORT_SYMBOL_GPL(md_kick_rdev_from_array
);
2263 static void export_array(struct mddev
*mddev
)
2265 struct md_rdev
*rdev
;
2267 while (!list_empty(&mddev
->disks
)) {
2268 rdev
= list_first_entry(&mddev
->disks
, struct md_rdev
,
2270 md_kick_rdev_from_array(rdev
);
2272 mddev
->raid_disks
= 0;
2273 mddev
->major_version
= 0;
2276 static bool set_in_sync(struct mddev
*mddev
)
2278 WARN_ON_ONCE(!spin_is_locked(&mddev
->lock
));
2279 if (!mddev
->in_sync
) {
2280 mddev
->sync_checkers
++;
2281 spin_unlock(&mddev
->lock
);
2282 percpu_ref_switch_to_atomic_sync(&mddev
->writes_pending
);
2283 spin_lock(&mddev
->lock
);
2284 if (!mddev
->in_sync
&&
2285 percpu_ref_is_zero(&mddev
->writes_pending
)) {
2288 * Ensure ->in_sync is visible before we clear
2292 set_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
2293 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
2295 if (--mddev
->sync_checkers
== 0)
2296 percpu_ref_switch_to_percpu(&mddev
->writes_pending
);
2298 if (mddev
->safemode
== 1)
2299 mddev
->safemode
= 0;
2300 return mddev
->in_sync
;
2303 static void sync_sbs(struct mddev
*mddev
, int nospares
)
2305 /* Update each superblock (in-memory image), but
2306 * if we are allowed to, skip spares which already
2307 * have the right event counter, or have one earlier
2308 * (which would mean they aren't being marked as dirty
2309 * with the rest of the array)
2311 struct md_rdev
*rdev
;
2312 rdev_for_each(rdev
, mddev
) {
2313 if (rdev
->sb_events
== mddev
->events
||
2315 rdev
->raid_disk
< 0 &&
2316 rdev
->sb_events
+1 == mddev
->events
)) {
2317 /* Don't update this superblock */
2318 rdev
->sb_loaded
= 2;
2320 sync_super(mddev
, rdev
);
2321 rdev
->sb_loaded
= 1;
2326 static bool does_sb_need_changing(struct mddev
*mddev
)
2328 struct md_rdev
*rdev
;
2329 struct mdp_superblock_1
*sb
;
2332 /* Find a good rdev */
2333 rdev_for_each(rdev
, mddev
)
2334 if ((rdev
->raid_disk
>= 0) && !test_bit(Faulty
, &rdev
->flags
))
2337 /* No good device found. */
2341 sb
= page_address(rdev
->sb_page
);
2342 /* Check if a device has become faulty or a spare become active */
2343 rdev_for_each(rdev
, mddev
) {
2344 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
2345 /* Device activated? */
2346 if (role
== 0xffff && rdev
->raid_disk
>=0 &&
2347 !test_bit(Faulty
, &rdev
->flags
))
2349 /* Device turned faulty? */
2350 if (test_bit(Faulty
, &rdev
->flags
) && (role
< 0xfffd))
2354 /* Check if any mddev parameters have changed */
2355 if ((mddev
->dev_sectors
!= le64_to_cpu(sb
->size
)) ||
2356 (mddev
->reshape_position
!= le64_to_cpu(sb
->reshape_position
)) ||
2357 (mddev
->layout
!= le32_to_cpu(sb
->layout
)) ||
2358 (mddev
->raid_disks
!= le32_to_cpu(sb
->raid_disks
)) ||
2359 (mddev
->chunk_sectors
!= le32_to_cpu(sb
->chunksize
)))
2365 void md_update_sb(struct mddev
*mddev
, int force_change
)
2367 struct md_rdev
*rdev
;
2370 int any_badblocks_changed
= 0;
2375 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
2380 if (mddev_is_clustered(mddev
)) {
2381 if (test_and_clear_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
))
2383 if (test_and_clear_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
))
2385 ret
= md_cluster_ops
->metadata_update_start(mddev
);
2386 /* Has someone else has updated the sb */
2387 if (!does_sb_need_changing(mddev
)) {
2389 md_cluster_ops
->metadata_update_cancel(mddev
);
2390 bit_clear_unless(&mddev
->sb_flags
, BIT(MD_SB_CHANGE_PENDING
),
2391 BIT(MD_SB_CHANGE_DEVS
) |
2392 BIT(MD_SB_CHANGE_CLEAN
));
2397 /* First make sure individual recovery_offsets are correct */
2398 rdev_for_each(rdev
, mddev
) {
2399 if (rdev
->raid_disk
>= 0 &&
2400 mddev
->delta_disks
>= 0 &&
2401 !test_bit(Journal
, &rdev
->flags
) &&
2402 !test_bit(In_sync
, &rdev
->flags
) &&
2403 mddev
->curr_resync_completed
> rdev
->recovery_offset
)
2404 rdev
->recovery_offset
= mddev
->curr_resync_completed
;
2407 if (!mddev
->persistent
) {
2408 clear_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
2409 clear_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
2410 if (!mddev
->external
) {
2411 clear_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
2412 rdev_for_each(rdev
, mddev
) {
2413 if (rdev
->badblocks
.changed
) {
2414 rdev
->badblocks
.changed
= 0;
2415 ack_all_badblocks(&rdev
->badblocks
);
2416 md_error(mddev
, rdev
);
2418 clear_bit(Blocked
, &rdev
->flags
);
2419 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2420 wake_up(&rdev
->blocked_wait
);
2423 wake_up(&mddev
->sb_wait
);
2427 spin_lock(&mddev
->lock
);
2429 mddev
->utime
= ktime_get_real_seconds();
2431 if (test_and_clear_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
))
2433 if (test_and_clear_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
))
2434 /* just a clean<-> dirty transition, possibly leave spares alone,
2435 * though if events isn't the right even/odd, we will have to do
2441 if (mddev
->degraded
)
2442 /* If the array is degraded, then skipping spares is both
2443 * dangerous and fairly pointless.
2444 * Dangerous because a device that was removed from the array
2445 * might have a event_count that still looks up-to-date,
2446 * so it can be re-added without a resync.
2447 * Pointless because if there are any spares to skip,
2448 * then a recovery will happen and soon that array won't
2449 * be degraded any more and the spare can go back to sleep then.
2453 sync_req
= mddev
->in_sync
;
2455 /* If this is just a dirty<->clean transition, and the array is clean
2456 * and 'events' is odd, we can roll back to the previous clean state */
2458 && (mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
2459 && mddev
->can_decrease_events
2460 && mddev
->events
!= 1) {
2462 mddev
->can_decrease_events
= 0;
2464 /* otherwise we have to go forward and ... */
2466 mddev
->can_decrease_events
= nospares
;
2470 * This 64-bit counter should never wrap.
2471 * Either we are in around ~1 trillion A.C., assuming
2472 * 1 reboot per second, or we have a bug...
2474 WARN_ON(mddev
->events
== 0);
2476 rdev_for_each(rdev
, mddev
) {
2477 if (rdev
->badblocks
.changed
)
2478 any_badblocks_changed
++;
2479 if (test_bit(Faulty
, &rdev
->flags
))
2480 set_bit(FaultRecorded
, &rdev
->flags
);
2483 sync_sbs(mddev
, nospares
);
2484 spin_unlock(&mddev
->lock
);
2486 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2487 mdname(mddev
), mddev
->in_sync
);
2490 blk_add_trace_msg(mddev
->queue
, "md md_update_sb");
2492 bitmap_update_sb(mddev
->bitmap
);
2493 rdev_for_each(rdev
, mddev
) {
2494 char b
[BDEVNAME_SIZE
];
2496 if (rdev
->sb_loaded
!= 1)
2497 continue; /* no noise on spare devices */
2499 if (!test_bit(Faulty
, &rdev
->flags
)) {
2500 md_super_write(mddev
,rdev
,
2501 rdev
->sb_start
, rdev
->sb_size
,
2503 pr_debug("md: (write) %s's sb offset: %llu\n",
2504 bdevname(rdev
->bdev
, b
),
2505 (unsigned long long)rdev
->sb_start
);
2506 rdev
->sb_events
= mddev
->events
;
2507 if (rdev
->badblocks
.size
) {
2508 md_super_write(mddev
, rdev
,
2509 rdev
->badblocks
.sector
,
2510 rdev
->badblocks
.size
<< 9,
2512 rdev
->badblocks
.size
= 0;
2516 pr_debug("md: %s (skipping faulty)\n",
2517 bdevname(rdev
->bdev
, b
));
2519 if (mddev
->level
== LEVEL_MULTIPATH
)
2520 /* only need to write one superblock... */
2523 if (md_super_wait(mddev
) < 0)
2525 /* if there was a failure, MD_SB_CHANGE_DEVS was set, and we re-write super */
2527 if (mddev_is_clustered(mddev
) && ret
== 0)
2528 md_cluster_ops
->metadata_update_finish(mddev
);
2530 if (mddev
->in_sync
!= sync_req
||
2531 !bit_clear_unless(&mddev
->sb_flags
, BIT(MD_SB_CHANGE_PENDING
),
2532 BIT(MD_SB_CHANGE_DEVS
) | BIT(MD_SB_CHANGE_CLEAN
)))
2533 /* have to write it out again */
2535 wake_up(&mddev
->sb_wait
);
2536 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
2537 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
2539 rdev_for_each(rdev
, mddev
) {
2540 if (test_and_clear_bit(FaultRecorded
, &rdev
->flags
))
2541 clear_bit(Blocked
, &rdev
->flags
);
2543 if (any_badblocks_changed
)
2544 ack_all_badblocks(&rdev
->badblocks
);
2545 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2546 wake_up(&rdev
->blocked_wait
);
2549 EXPORT_SYMBOL(md_update_sb
);
2551 static int add_bound_rdev(struct md_rdev
*rdev
)
2553 struct mddev
*mddev
= rdev
->mddev
;
2555 bool add_journal
= test_bit(Journal
, &rdev
->flags
);
2557 if (!mddev
->pers
->hot_remove_disk
|| add_journal
) {
2558 /* If there is hot_add_disk but no hot_remove_disk
2559 * then added disks for geometry changes,
2560 * and should be added immediately.
2562 super_types
[mddev
->major_version
].
2563 validate_super(mddev
, rdev
);
2565 mddev_suspend(mddev
);
2566 err
= mddev
->pers
->hot_add_disk(mddev
, rdev
);
2568 mddev_resume(mddev
);
2570 md_kick_rdev_from_array(rdev
);
2574 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2576 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
2577 if (mddev
->degraded
)
2578 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
2579 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
2580 md_new_event(mddev
);
2581 md_wakeup_thread(mddev
->thread
);
2585 /* words written to sysfs files may, or may not, be \n terminated.
2586 * We want to accept with case. For this we use cmd_match.
2588 static int cmd_match(const char *cmd
, const char *str
)
2590 /* See if cmd, written into a sysfs file, matches
2591 * str. They must either be the same, or cmd can
2592 * have a trailing newline
2594 while (*cmd
&& *str
&& *cmd
== *str
) {
2605 struct rdev_sysfs_entry
{
2606 struct attribute attr
;
2607 ssize_t (*show
)(struct md_rdev
*, char *);
2608 ssize_t (*store
)(struct md_rdev
*, const char *, size_t);
2612 state_show(struct md_rdev
*rdev
, char *page
)
2616 unsigned long flags
= ACCESS_ONCE(rdev
->flags
);
2618 if (test_bit(Faulty
, &flags
) ||
2619 (!test_bit(ExternalBbl
, &flags
) &&
2620 rdev
->badblocks
.unacked_exist
))
2621 len
+= sprintf(page
+len
, "faulty%s", sep
);
2622 if (test_bit(In_sync
, &flags
))
2623 len
+= sprintf(page
+len
, "in_sync%s", sep
);
2624 if (test_bit(Journal
, &flags
))
2625 len
+= sprintf(page
+len
, "journal%s", sep
);
2626 if (test_bit(WriteMostly
, &flags
))
2627 len
+= sprintf(page
+len
, "write_mostly%s", sep
);
2628 if (test_bit(Blocked
, &flags
) ||
2629 (rdev
->badblocks
.unacked_exist
2630 && !test_bit(Faulty
, &flags
)))
2631 len
+= sprintf(page
+len
, "blocked%s", sep
);
2632 if (!test_bit(Faulty
, &flags
) &&
2633 !test_bit(Journal
, &flags
) &&
2634 !test_bit(In_sync
, &flags
))
2635 len
+= sprintf(page
+len
, "spare%s", sep
);
2636 if (test_bit(WriteErrorSeen
, &flags
))
2637 len
+= sprintf(page
+len
, "write_error%s", sep
);
2638 if (test_bit(WantReplacement
, &flags
))
2639 len
+= sprintf(page
+len
, "want_replacement%s", sep
);
2640 if (test_bit(Replacement
, &flags
))
2641 len
+= sprintf(page
+len
, "replacement%s", sep
);
2642 if (test_bit(ExternalBbl
, &flags
))
2643 len
+= sprintf(page
+len
, "external_bbl%s", sep
);
2644 if (test_bit(FailFast
, &flags
))
2645 len
+= sprintf(page
+len
, "failfast%s", sep
);
2650 return len
+sprintf(page
+len
, "\n");
2654 state_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2657 * faulty - simulates an error
2658 * remove - disconnects the device
2659 * writemostly - sets write_mostly
2660 * -writemostly - clears write_mostly
2661 * blocked - sets the Blocked flags
2662 * -blocked - clears the Blocked and possibly simulates an error
2663 * insync - sets Insync providing device isn't active
2664 * -insync - clear Insync for a device with a slot assigned,
2665 * so that it gets rebuilt based on bitmap
2666 * write_error - sets WriteErrorSeen
2667 * -write_error - clears WriteErrorSeen
2668 * {,-}failfast - set/clear FailFast
2671 if (cmd_match(buf
, "faulty") && rdev
->mddev
->pers
) {
2672 md_error(rdev
->mddev
, rdev
);
2673 if (test_bit(Faulty
, &rdev
->flags
))
2677 } else if (cmd_match(buf
, "remove")) {
2678 if (rdev
->mddev
->pers
) {
2679 clear_bit(Blocked
, &rdev
->flags
);
2680 remove_and_add_spares(rdev
->mddev
, rdev
);
2682 if (rdev
->raid_disk
>= 0)
2685 struct mddev
*mddev
= rdev
->mddev
;
2687 if (mddev_is_clustered(mddev
))
2688 err
= md_cluster_ops
->remove_disk(mddev
, rdev
);
2691 md_kick_rdev_from_array(rdev
);
2693 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
2694 md_wakeup_thread(mddev
->thread
);
2696 md_new_event(mddev
);
2699 } else if (cmd_match(buf
, "writemostly")) {
2700 set_bit(WriteMostly
, &rdev
->flags
);
2702 } else if (cmd_match(buf
, "-writemostly")) {
2703 clear_bit(WriteMostly
, &rdev
->flags
);
2705 } else if (cmd_match(buf
, "blocked")) {
2706 set_bit(Blocked
, &rdev
->flags
);
2708 } else if (cmd_match(buf
, "-blocked")) {
2709 if (!test_bit(Faulty
, &rdev
->flags
) &&
2710 !test_bit(ExternalBbl
, &rdev
->flags
) &&
2711 rdev
->badblocks
.unacked_exist
) {
2712 /* metadata handler doesn't understand badblocks,
2713 * so we need to fail the device
2715 md_error(rdev
->mddev
, rdev
);
2717 clear_bit(Blocked
, &rdev
->flags
);
2718 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2719 wake_up(&rdev
->blocked_wait
);
2720 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2721 md_wakeup_thread(rdev
->mddev
->thread
);
2724 } else if (cmd_match(buf
, "insync") && rdev
->raid_disk
== -1) {
2725 set_bit(In_sync
, &rdev
->flags
);
2727 } else if (cmd_match(buf
, "failfast")) {
2728 set_bit(FailFast
, &rdev
->flags
);
2730 } else if (cmd_match(buf
, "-failfast")) {
2731 clear_bit(FailFast
, &rdev
->flags
);
2733 } else if (cmd_match(buf
, "-insync") && rdev
->raid_disk
>= 0 &&
2734 !test_bit(Journal
, &rdev
->flags
)) {
2735 if (rdev
->mddev
->pers
== NULL
) {
2736 clear_bit(In_sync
, &rdev
->flags
);
2737 rdev
->saved_raid_disk
= rdev
->raid_disk
;
2738 rdev
->raid_disk
= -1;
2741 } else if (cmd_match(buf
, "write_error")) {
2742 set_bit(WriteErrorSeen
, &rdev
->flags
);
2744 } else if (cmd_match(buf
, "-write_error")) {
2745 clear_bit(WriteErrorSeen
, &rdev
->flags
);
2747 } else if (cmd_match(buf
, "want_replacement")) {
2748 /* Any non-spare device that is not a replacement can
2749 * become want_replacement at any time, but we then need to
2750 * check if recovery is needed.
2752 if (rdev
->raid_disk
>= 0 &&
2753 !test_bit(Journal
, &rdev
->flags
) &&
2754 !test_bit(Replacement
, &rdev
->flags
))
2755 set_bit(WantReplacement
, &rdev
->flags
);
2756 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2757 md_wakeup_thread(rdev
->mddev
->thread
);
2759 } else if (cmd_match(buf
, "-want_replacement")) {
2760 /* Clearing 'want_replacement' is always allowed.
2761 * Once replacements starts it is too late though.
2764 clear_bit(WantReplacement
, &rdev
->flags
);
2765 } else if (cmd_match(buf
, "replacement")) {
2766 /* Can only set a device as a replacement when array has not
2767 * yet been started. Once running, replacement is automatic
2768 * from spares, or by assigning 'slot'.
2770 if (rdev
->mddev
->pers
)
2773 set_bit(Replacement
, &rdev
->flags
);
2776 } else if (cmd_match(buf
, "-replacement")) {
2777 /* Similarly, can only clear Replacement before start */
2778 if (rdev
->mddev
->pers
)
2781 clear_bit(Replacement
, &rdev
->flags
);
2784 } else if (cmd_match(buf
, "re-add")) {
2785 if (test_bit(Faulty
, &rdev
->flags
) && (rdev
->raid_disk
== -1)) {
2786 /* clear_bit is performed _after_ all the devices
2787 * have their local Faulty bit cleared. If any writes
2788 * happen in the meantime in the local node, they
2789 * will land in the local bitmap, which will be synced
2790 * by this node eventually
2792 if (!mddev_is_clustered(rdev
->mddev
) ||
2793 (err
= md_cluster_ops
->gather_bitmaps(rdev
)) == 0) {
2794 clear_bit(Faulty
, &rdev
->flags
);
2795 err
= add_bound_rdev(rdev
);
2799 } else if (cmd_match(buf
, "external_bbl") && (rdev
->mddev
->external
)) {
2800 set_bit(ExternalBbl
, &rdev
->flags
);
2801 rdev
->badblocks
.shift
= 0;
2803 } else if (cmd_match(buf
, "-external_bbl") && (rdev
->mddev
->external
)) {
2804 clear_bit(ExternalBbl
, &rdev
->flags
);
2808 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2809 return err
? err
: len
;
2811 static struct rdev_sysfs_entry rdev_state
=
2812 __ATTR_PREALLOC(state
, S_IRUGO
|S_IWUSR
, state_show
, state_store
);
2815 errors_show(struct md_rdev
*rdev
, char *page
)
2817 return sprintf(page
, "%d\n", atomic_read(&rdev
->corrected_errors
));
2821 errors_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2826 rv
= kstrtouint(buf
, 10, &n
);
2829 atomic_set(&rdev
->corrected_errors
, n
);
2832 static struct rdev_sysfs_entry rdev_errors
=
2833 __ATTR(errors
, S_IRUGO
|S_IWUSR
, errors_show
, errors_store
);
2836 slot_show(struct md_rdev
*rdev
, char *page
)
2838 if (test_bit(Journal
, &rdev
->flags
))
2839 return sprintf(page
, "journal\n");
2840 else if (rdev
->raid_disk
< 0)
2841 return sprintf(page
, "none\n");
2843 return sprintf(page
, "%d\n", rdev
->raid_disk
);
2847 slot_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2852 if (test_bit(Journal
, &rdev
->flags
))
2854 if (strncmp(buf
, "none", 4)==0)
2857 err
= kstrtouint(buf
, 10, (unsigned int *)&slot
);
2861 if (rdev
->mddev
->pers
&& slot
== -1) {
2862 /* Setting 'slot' on an active array requires also
2863 * updating the 'rd%d' link, and communicating
2864 * with the personality with ->hot_*_disk.
2865 * For now we only support removing
2866 * failed/spare devices. This normally happens automatically,
2867 * but not when the metadata is externally managed.
2869 if (rdev
->raid_disk
== -1)
2871 /* personality does all needed checks */
2872 if (rdev
->mddev
->pers
->hot_remove_disk
== NULL
)
2874 clear_bit(Blocked
, &rdev
->flags
);
2875 remove_and_add_spares(rdev
->mddev
, rdev
);
2876 if (rdev
->raid_disk
>= 0)
2878 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2879 md_wakeup_thread(rdev
->mddev
->thread
);
2880 } else if (rdev
->mddev
->pers
) {
2881 /* Activating a spare .. or possibly reactivating
2882 * if we ever get bitmaps working here.
2886 if (rdev
->raid_disk
!= -1)
2889 if (test_bit(MD_RECOVERY_RUNNING
, &rdev
->mddev
->recovery
))
2892 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
2895 if (slot
>= rdev
->mddev
->raid_disks
&&
2896 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
2899 rdev
->raid_disk
= slot
;
2900 if (test_bit(In_sync
, &rdev
->flags
))
2901 rdev
->saved_raid_disk
= slot
;
2903 rdev
->saved_raid_disk
= -1;
2904 clear_bit(In_sync
, &rdev
->flags
);
2905 clear_bit(Bitmap_sync
, &rdev
->flags
);
2906 err
= rdev
->mddev
->pers
->
2907 hot_add_disk(rdev
->mddev
, rdev
);
2909 rdev
->raid_disk
= -1;
2912 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2913 if (sysfs_link_rdev(rdev
->mddev
, rdev
))
2914 /* failure here is OK */;
2915 /* don't wakeup anyone, leave that to userspace. */
2917 if (slot
>= rdev
->mddev
->raid_disks
&&
2918 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
2920 rdev
->raid_disk
= slot
;
2921 /* assume it is working */
2922 clear_bit(Faulty
, &rdev
->flags
);
2923 clear_bit(WriteMostly
, &rdev
->flags
);
2924 set_bit(In_sync
, &rdev
->flags
);
2925 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2930 static struct rdev_sysfs_entry rdev_slot
=
2931 __ATTR(slot
, S_IRUGO
|S_IWUSR
, slot_show
, slot_store
);
2934 offset_show(struct md_rdev
*rdev
, char *page
)
2936 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->data_offset
);
2940 offset_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2942 unsigned long long offset
;
2943 if (kstrtoull(buf
, 10, &offset
) < 0)
2945 if (rdev
->mddev
->pers
&& rdev
->raid_disk
>= 0)
2947 if (rdev
->sectors
&& rdev
->mddev
->external
)
2948 /* Must set offset before size, so overlap checks
2951 rdev
->data_offset
= offset
;
2952 rdev
->new_data_offset
= offset
;
2956 static struct rdev_sysfs_entry rdev_offset
=
2957 __ATTR(offset
, S_IRUGO
|S_IWUSR
, offset_show
, offset_store
);
2959 static ssize_t
new_offset_show(struct md_rdev
*rdev
, char *page
)
2961 return sprintf(page
, "%llu\n",
2962 (unsigned long long)rdev
->new_data_offset
);
2965 static ssize_t
new_offset_store(struct md_rdev
*rdev
,
2966 const char *buf
, size_t len
)
2968 unsigned long long new_offset
;
2969 struct mddev
*mddev
= rdev
->mddev
;
2971 if (kstrtoull(buf
, 10, &new_offset
) < 0)
2974 if (mddev
->sync_thread
||
2975 test_bit(MD_RECOVERY_RUNNING
,&mddev
->recovery
))
2977 if (new_offset
== rdev
->data_offset
)
2978 /* reset is always permitted */
2980 else if (new_offset
> rdev
->data_offset
) {
2981 /* must not push array size beyond rdev_sectors */
2982 if (new_offset
- rdev
->data_offset
2983 + mddev
->dev_sectors
> rdev
->sectors
)
2986 /* Metadata worries about other space details. */
2988 /* decreasing the offset is inconsistent with a backwards
2991 if (new_offset
< rdev
->data_offset
&&
2992 mddev
->reshape_backwards
)
2994 /* Increasing offset is inconsistent with forwards
2995 * reshape. reshape_direction should be set to
2996 * 'backwards' first.
2998 if (new_offset
> rdev
->data_offset
&&
2999 !mddev
->reshape_backwards
)
3002 if (mddev
->pers
&& mddev
->persistent
&&
3003 !super_types
[mddev
->major_version
]
3004 .allow_new_offset(rdev
, new_offset
))
3006 rdev
->new_data_offset
= new_offset
;
3007 if (new_offset
> rdev
->data_offset
)
3008 mddev
->reshape_backwards
= 1;
3009 else if (new_offset
< rdev
->data_offset
)
3010 mddev
->reshape_backwards
= 0;
3014 static struct rdev_sysfs_entry rdev_new_offset
=
3015 __ATTR(new_offset
, S_IRUGO
|S_IWUSR
, new_offset_show
, new_offset_store
);
3018 rdev_size_show(struct md_rdev
*rdev
, char *page
)
3020 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->sectors
/ 2);
3023 static int overlaps(sector_t s1
, sector_t l1
, sector_t s2
, sector_t l2
)
3025 /* check if two start/length pairs overlap */
3033 static int strict_blocks_to_sectors(const char *buf
, sector_t
*sectors
)
3035 unsigned long long blocks
;
3038 if (kstrtoull(buf
, 10, &blocks
) < 0)
3041 if (blocks
& 1ULL << (8 * sizeof(blocks
) - 1))
3042 return -EINVAL
; /* sector conversion overflow */
3045 if (new != blocks
* 2)
3046 return -EINVAL
; /* unsigned long long to sector_t overflow */
3053 rdev_size_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3055 struct mddev
*my_mddev
= rdev
->mddev
;
3056 sector_t oldsectors
= rdev
->sectors
;
3059 if (test_bit(Journal
, &rdev
->flags
))
3061 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
3063 if (rdev
->data_offset
!= rdev
->new_data_offset
)
3064 return -EINVAL
; /* too confusing */
3065 if (my_mddev
->pers
&& rdev
->raid_disk
>= 0) {
3066 if (my_mddev
->persistent
) {
3067 sectors
= super_types
[my_mddev
->major_version
].
3068 rdev_size_change(rdev
, sectors
);
3071 } else if (!sectors
)
3072 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) -
3074 if (!my_mddev
->pers
->resize
)
3075 /* Cannot change size for RAID0 or Linear etc */
3078 if (sectors
< my_mddev
->dev_sectors
)
3079 return -EINVAL
; /* component must fit device */
3081 rdev
->sectors
= sectors
;
3082 if (sectors
> oldsectors
&& my_mddev
->external
) {
3083 /* Need to check that all other rdevs with the same
3084 * ->bdev do not overlap. 'rcu' is sufficient to walk
3085 * the rdev lists safely.
3086 * This check does not provide a hard guarantee, it
3087 * just helps avoid dangerous mistakes.
3089 struct mddev
*mddev
;
3091 struct list_head
*tmp
;
3094 for_each_mddev(mddev
, tmp
) {
3095 struct md_rdev
*rdev2
;
3097 rdev_for_each(rdev2
, mddev
)
3098 if (rdev
->bdev
== rdev2
->bdev
&&
3100 overlaps(rdev
->data_offset
, rdev
->sectors
,
3113 /* Someone else could have slipped in a size
3114 * change here, but doing so is just silly.
3115 * We put oldsectors back because we *know* it is
3116 * safe, and trust userspace not to race with
3119 rdev
->sectors
= oldsectors
;
3126 static struct rdev_sysfs_entry rdev_size
=
3127 __ATTR(size
, S_IRUGO
|S_IWUSR
, rdev_size_show
, rdev_size_store
);
3129 static ssize_t
recovery_start_show(struct md_rdev
*rdev
, char *page
)
3131 unsigned long long recovery_start
= rdev
->recovery_offset
;
3133 if (test_bit(In_sync
, &rdev
->flags
) ||
3134 recovery_start
== MaxSector
)
3135 return sprintf(page
, "none\n");
3137 return sprintf(page
, "%llu\n", recovery_start
);
3140 static ssize_t
recovery_start_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3142 unsigned long long recovery_start
;
3144 if (cmd_match(buf
, "none"))
3145 recovery_start
= MaxSector
;
3146 else if (kstrtoull(buf
, 10, &recovery_start
))
3149 if (rdev
->mddev
->pers
&&
3150 rdev
->raid_disk
>= 0)
3153 rdev
->recovery_offset
= recovery_start
;
3154 if (recovery_start
== MaxSector
)
3155 set_bit(In_sync
, &rdev
->flags
);
3157 clear_bit(In_sync
, &rdev
->flags
);
3161 static struct rdev_sysfs_entry rdev_recovery_start
=
3162 __ATTR(recovery_start
, S_IRUGO
|S_IWUSR
, recovery_start_show
, recovery_start_store
);
3164 /* sysfs access to bad-blocks list.
3165 * We present two files.
3166 * 'bad-blocks' lists sector numbers and lengths of ranges that
3167 * are recorded as bad. The list is truncated to fit within
3168 * the one-page limit of sysfs.
3169 * Writing "sector length" to this file adds an acknowledged
3171 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
3172 * been acknowledged. Writing to this file adds bad blocks
3173 * without acknowledging them. This is largely for testing.
3175 static ssize_t
bb_show(struct md_rdev
*rdev
, char *page
)
3177 return badblocks_show(&rdev
->badblocks
, page
, 0);
3179 static ssize_t
bb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
3181 int rv
= badblocks_store(&rdev
->badblocks
, page
, len
, 0);
3182 /* Maybe that ack was all we needed */
3183 if (test_and_clear_bit(BlockedBadBlocks
, &rdev
->flags
))
3184 wake_up(&rdev
->blocked_wait
);
3187 static struct rdev_sysfs_entry rdev_bad_blocks
=
3188 __ATTR(bad_blocks
, S_IRUGO
|S_IWUSR
, bb_show
, bb_store
);
3190 static ssize_t
ubb_show(struct md_rdev
*rdev
, char *page
)
3192 return badblocks_show(&rdev
->badblocks
, page
, 1);
3194 static ssize_t
ubb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
3196 return badblocks_store(&rdev
->badblocks
, page
, len
, 1);
3198 static struct rdev_sysfs_entry rdev_unack_bad_blocks
=
3199 __ATTR(unacknowledged_bad_blocks
, S_IRUGO
|S_IWUSR
, ubb_show
, ubb_store
);
3202 ppl_sector_show(struct md_rdev
*rdev
, char *page
)
3204 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->ppl
.sector
);
3208 ppl_sector_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3210 unsigned long long sector
;
3212 if (kstrtoull(buf
, 10, §or
) < 0)
3214 if (sector
!= (sector_t
)sector
)
3217 if (rdev
->mddev
->pers
&& test_bit(MD_HAS_PPL
, &rdev
->mddev
->flags
) &&
3218 rdev
->raid_disk
>= 0)
3221 if (rdev
->mddev
->persistent
) {
3222 if (rdev
->mddev
->major_version
== 0)
3224 if ((sector
> rdev
->sb_start
&&
3225 sector
- rdev
->sb_start
> S16_MAX
) ||
3226 (sector
< rdev
->sb_start
&&
3227 rdev
->sb_start
- sector
> -S16_MIN
))
3229 rdev
->ppl
.offset
= sector
- rdev
->sb_start
;
3230 } else if (!rdev
->mddev
->external
) {
3233 rdev
->ppl
.sector
= sector
;
3237 static struct rdev_sysfs_entry rdev_ppl_sector
=
3238 __ATTR(ppl_sector
, S_IRUGO
|S_IWUSR
, ppl_sector_show
, ppl_sector_store
);
3241 ppl_size_show(struct md_rdev
*rdev
, char *page
)
3243 return sprintf(page
, "%u\n", rdev
->ppl
.size
);
3247 ppl_size_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3251 if (kstrtouint(buf
, 10, &size
) < 0)
3254 if (rdev
->mddev
->pers
&& test_bit(MD_HAS_PPL
, &rdev
->mddev
->flags
) &&
3255 rdev
->raid_disk
>= 0)
3258 if (rdev
->mddev
->persistent
) {
3259 if (rdev
->mddev
->major_version
== 0)
3263 } else if (!rdev
->mddev
->external
) {
3266 rdev
->ppl
.size
= size
;
3270 static struct rdev_sysfs_entry rdev_ppl_size
=
3271 __ATTR(ppl_size
, S_IRUGO
|S_IWUSR
, ppl_size_show
, ppl_size_store
);
3273 static struct attribute
*rdev_default_attrs
[] = {
3278 &rdev_new_offset
.attr
,
3280 &rdev_recovery_start
.attr
,
3281 &rdev_bad_blocks
.attr
,
3282 &rdev_unack_bad_blocks
.attr
,
3283 &rdev_ppl_sector
.attr
,
3284 &rdev_ppl_size
.attr
,
3288 rdev_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
3290 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
3291 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
3297 return entry
->show(rdev
, page
);
3301 rdev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
3302 const char *page
, size_t length
)
3304 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
3305 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
3307 struct mddev
*mddev
= rdev
->mddev
;
3311 if (!capable(CAP_SYS_ADMIN
))
3313 rv
= mddev
? mddev_lock(mddev
): -EBUSY
;
3315 if (rdev
->mddev
== NULL
)
3318 rv
= entry
->store(rdev
, page
, length
);
3319 mddev_unlock(mddev
);
3324 static void rdev_free(struct kobject
*ko
)
3326 struct md_rdev
*rdev
= container_of(ko
, struct md_rdev
, kobj
);
3329 static const struct sysfs_ops rdev_sysfs_ops
= {
3330 .show
= rdev_attr_show
,
3331 .store
= rdev_attr_store
,
3333 static struct kobj_type rdev_ktype
= {
3334 .release
= rdev_free
,
3335 .sysfs_ops
= &rdev_sysfs_ops
,
3336 .default_attrs
= rdev_default_attrs
,
3339 int md_rdev_init(struct md_rdev
*rdev
)
3342 rdev
->saved_raid_disk
= -1;
3343 rdev
->raid_disk
= -1;
3345 rdev
->data_offset
= 0;
3346 rdev
->new_data_offset
= 0;
3347 rdev
->sb_events
= 0;
3348 rdev
->last_read_error
= 0;
3349 rdev
->sb_loaded
= 0;
3350 rdev
->bb_page
= NULL
;
3351 atomic_set(&rdev
->nr_pending
, 0);
3352 atomic_set(&rdev
->read_errors
, 0);
3353 atomic_set(&rdev
->corrected_errors
, 0);
3355 INIT_LIST_HEAD(&rdev
->same_set
);
3356 init_waitqueue_head(&rdev
->blocked_wait
);
3358 /* Add space to store bad block list.
3359 * This reserves the space even on arrays where it cannot
3360 * be used - I wonder if that matters
3362 return badblocks_init(&rdev
->badblocks
, 0);
3364 EXPORT_SYMBOL_GPL(md_rdev_init
);
3366 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3368 * mark the device faulty if:
3370 * - the device is nonexistent (zero size)
3371 * - the device has no valid superblock
3373 * a faulty rdev _never_ has rdev->sb set.
3375 static struct md_rdev
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
3377 char b
[BDEVNAME_SIZE
];
3379 struct md_rdev
*rdev
;
3382 rdev
= kzalloc(sizeof(*rdev
), GFP_KERNEL
);
3384 return ERR_PTR(-ENOMEM
);
3386 err
= md_rdev_init(rdev
);
3389 err
= alloc_disk_sb(rdev
);
3393 err
= lock_rdev(rdev
, newdev
, super_format
== -2);
3397 kobject_init(&rdev
->kobj
, &rdev_ktype
);
3399 size
= i_size_read(rdev
->bdev
->bd_inode
) >> BLOCK_SIZE_BITS
;
3401 pr_warn("md: %s has zero or unknown size, marking faulty!\n",
3402 bdevname(rdev
->bdev
,b
));
3407 if (super_format
>= 0) {
3408 err
= super_types
[super_format
].
3409 load_super(rdev
, NULL
, super_minor
);
3410 if (err
== -EINVAL
) {
3411 pr_warn("md: %s does not have a valid v%d.%d superblock, not importing!\n",
3412 bdevname(rdev
->bdev
,b
),
3413 super_format
, super_minor
);
3417 pr_warn("md: could not read %s's sb, not importing!\n",
3418 bdevname(rdev
->bdev
,b
));
3428 md_rdev_clear(rdev
);
3430 return ERR_PTR(err
);
3434 * Check a full RAID array for plausibility
3437 static void analyze_sbs(struct mddev
*mddev
)
3440 struct md_rdev
*rdev
, *freshest
, *tmp
;
3441 char b
[BDEVNAME_SIZE
];
3444 rdev_for_each_safe(rdev
, tmp
, mddev
)
3445 switch (super_types
[mddev
->major_version
].
3446 load_super(rdev
, freshest
, mddev
->minor_version
)) {
3453 pr_warn("md: fatal superblock inconsistency in %s -- removing from array\n",
3454 bdevname(rdev
->bdev
,b
));
3455 md_kick_rdev_from_array(rdev
);
3458 super_types
[mddev
->major_version
].
3459 validate_super(mddev
, freshest
);
3462 rdev_for_each_safe(rdev
, tmp
, mddev
) {
3463 if (mddev
->max_disks
&&
3464 (rdev
->desc_nr
>= mddev
->max_disks
||
3465 i
> mddev
->max_disks
)) {
3466 pr_warn("md: %s: %s: only %d devices permitted\n",
3467 mdname(mddev
), bdevname(rdev
->bdev
, b
),
3469 md_kick_rdev_from_array(rdev
);
3472 if (rdev
!= freshest
) {
3473 if (super_types
[mddev
->major_version
].
3474 validate_super(mddev
, rdev
)) {
3475 pr_warn("md: kicking non-fresh %s from array!\n",
3476 bdevname(rdev
->bdev
,b
));
3477 md_kick_rdev_from_array(rdev
);
3481 if (mddev
->level
== LEVEL_MULTIPATH
) {
3482 rdev
->desc_nr
= i
++;
3483 rdev
->raid_disk
= rdev
->desc_nr
;
3484 set_bit(In_sync
, &rdev
->flags
);
3485 } else if (rdev
->raid_disk
>=
3486 (mddev
->raid_disks
- min(0, mddev
->delta_disks
)) &&
3487 !test_bit(Journal
, &rdev
->flags
)) {
3488 rdev
->raid_disk
= -1;
3489 clear_bit(In_sync
, &rdev
->flags
);
3494 /* Read a fixed-point number.
3495 * Numbers in sysfs attributes should be in "standard" units where
3496 * possible, so time should be in seconds.
3497 * However we internally use a a much smaller unit such as
3498 * milliseconds or jiffies.
3499 * This function takes a decimal number with a possible fractional
3500 * component, and produces an integer which is the result of
3501 * multiplying that number by 10^'scale'.
3502 * all without any floating-point arithmetic.
3504 int strict_strtoul_scaled(const char *cp
, unsigned long *res
, int scale
)
3506 unsigned long result
= 0;
3508 while (isdigit(*cp
) || (*cp
== '.' && decimals
< 0)) {
3511 else if (decimals
< scale
) {
3514 result
= result
* 10 + value
;
3526 while (decimals
< scale
) {
3535 safe_delay_show(struct mddev
*mddev
, char *page
)
3537 int msec
= (mddev
->safemode_delay
*1000)/HZ
;
3538 return sprintf(page
, "%d.%03d\n", msec
/1000, msec
%1000);
3541 safe_delay_store(struct mddev
*mddev
, const char *cbuf
, size_t len
)
3545 if (mddev_is_clustered(mddev
)) {
3546 pr_warn("md: Safemode is disabled for clustered mode\n");
3550 if (strict_strtoul_scaled(cbuf
, &msec
, 3) < 0)
3553 mddev
->safemode_delay
= 0;
3555 unsigned long old_delay
= mddev
->safemode_delay
;
3556 unsigned long new_delay
= (msec
*HZ
)/1000;
3560 mddev
->safemode_delay
= new_delay
;
3561 if (new_delay
< old_delay
|| old_delay
== 0)
3562 mod_timer(&mddev
->safemode_timer
, jiffies
+1);
3566 static struct md_sysfs_entry md_safe_delay
=
3567 __ATTR(safe_mode_delay
, S_IRUGO
|S_IWUSR
,safe_delay_show
, safe_delay_store
);
3570 level_show(struct mddev
*mddev
, char *page
)
3572 struct md_personality
*p
;
3574 spin_lock(&mddev
->lock
);
3577 ret
= sprintf(page
, "%s\n", p
->name
);
3578 else if (mddev
->clevel
[0])
3579 ret
= sprintf(page
, "%s\n", mddev
->clevel
);
3580 else if (mddev
->level
!= LEVEL_NONE
)
3581 ret
= sprintf(page
, "%d\n", mddev
->level
);
3584 spin_unlock(&mddev
->lock
);
3589 level_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3594 struct md_personality
*pers
, *oldpers
;
3596 void *priv
, *oldpriv
;
3597 struct md_rdev
*rdev
;
3599 if (slen
== 0 || slen
>= sizeof(clevel
))
3602 rv
= mddev_lock(mddev
);
3606 if (mddev
->pers
== NULL
) {
3607 strncpy(mddev
->clevel
, buf
, slen
);
3608 if (mddev
->clevel
[slen
-1] == '\n')
3610 mddev
->clevel
[slen
] = 0;
3611 mddev
->level
= LEVEL_NONE
;
3619 /* request to change the personality. Need to ensure:
3620 * - array is not engaged in resync/recovery/reshape
3621 * - old personality can be suspended
3622 * - new personality will access other array.
3626 if (mddev
->sync_thread
||
3627 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
3628 mddev
->reshape_position
!= MaxSector
||
3629 mddev
->sysfs_active
)
3633 if (!mddev
->pers
->quiesce
) {
3634 pr_warn("md: %s: %s does not support online personality change\n",
3635 mdname(mddev
), mddev
->pers
->name
);
3639 /* Now find the new personality */
3640 strncpy(clevel
, buf
, slen
);
3641 if (clevel
[slen
-1] == '\n')
3644 if (kstrtol(clevel
, 10, &level
))
3647 if (request_module("md-%s", clevel
) != 0)
3648 request_module("md-level-%s", clevel
);
3649 spin_lock(&pers_lock
);
3650 pers
= find_pers(level
, clevel
);
3651 if (!pers
|| !try_module_get(pers
->owner
)) {
3652 spin_unlock(&pers_lock
);
3653 pr_warn("md: personality %s not loaded\n", clevel
);
3657 spin_unlock(&pers_lock
);
3659 if (pers
== mddev
->pers
) {
3660 /* Nothing to do! */
3661 module_put(pers
->owner
);
3665 if (!pers
->takeover
) {
3666 module_put(pers
->owner
);
3667 pr_warn("md: %s: %s does not support personality takeover\n",
3668 mdname(mddev
), clevel
);
3673 rdev_for_each(rdev
, mddev
)
3674 rdev
->new_raid_disk
= rdev
->raid_disk
;
3676 /* ->takeover must set new_* and/or delta_disks
3677 * if it succeeds, and may set them when it fails.
3679 priv
= pers
->takeover(mddev
);
3681 mddev
->new_level
= mddev
->level
;
3682 mddev
->new_layout
= mddev
->layout
;
3683 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3684 mddev
->raid_disks
-= mddev
->delta_disks
;
3685 mddev
->delta_disks
= 0;
3686 mddev
->reshape_backwards
= 0;
3687 module_put(pers
->owner
);
3688 pr_warn("md: %s: %s would not accept array\n",
3689 mdname(mddev
), clevel
);
3694 /* Looks like we have a winner */
3695 mddev_suspend(mddev
);
3696 mddev_detach(mddev
);
3698 spin_lock(&mddev
->lock
);
3699 oldpers
= mddev
->pers
;
3700 oldpriv
= mddev
->private;
3702 mddev
->private = priv
;
3703 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
3704 mddev
->level
= mddev
->new_level
;
3705 mddev
->layout
= mddev
->new_layout
;
3706 mddev
->chunk_sectors
= mddev
->new_chunk_sectors
;
3707 mddev
->delta_disks
= 0;
3708 mddev
->reshape_backwards
= 0;
3709 mddev
->degraded
= 0;
3710 spin_unlock(&mddev
->lock
);
3712 if (oldpers
->sync_request
== NULL
&&
3714 /* We are converting from a no-redundancy array
3715 * to a redundancy array and metadata is managed
3716 * externally so we need to be sure that writes
3717 * won't block due to a need to transition
3719 * until external management is started.
3722 mddev
->safemode_delay
= 0;
3723 mddev
->safemode
= 0;
3726 oldpers
->free(mddev
, oldpriv
);
3728 if (oldpers
->sync_request
== NULL
&&
3729 pers
->sync_request
!= NULL
) {
3730 /* need to add the md_redundancy_group */
3731 if (sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
3732 pr_warn("md: cannot register extra attributes for %s\n",
3734 mddev
->sysfs_action
= sysfs_get_dirent(mddev
->kobj
.sd
, "sync_action");
3736 if (oldpers
->sync_request
!= NULL
&&
3737 pers
->sync_request
== NULL
) {
3738 /* need to remove the md_redundancy_group */
3739 if (mddev
->to_remove
== NULL
)
3740 mddev
->to_remove
= &md_redundancy_group
;
3743 module_put(oldpers
->owner
);
3745 rdev_for_each(rdev
, mddev
) {
3746 if (rdev
->raid_disk
< 0)
3748 if (rdev
->new_raid_disk
>= mddev
->raid_disks
)
3749 rdev
->new_raid_disk
= -1;
3750 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3752 sysfs_unlink_rdev(mddev
, rdev
);
3754 rdev_for_each(rdev
, mddev
) {
3755 if (rdev
->raid_disk
< 0)
3757 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3759 rdev
->raid_disk
= rdev
->new_raid_disk
;
3760 if (rdev
->raid_disk
< 0)
3761 clear_bit(In_sync
, &rdev
->flags
);
3763 if (sysfs_link_rdev(mddev
, rdev
))
3764 pr_warn("md: cannot register rd%d for %s after level change\n",
3765 rdev
->raid_disk
, mdname(mddev
));
3769 if (pers
->sync_request
== NULL
) {
3770 /* this is now an array without redundancy, so
3771 * it must always be in_sync
3774 del_timer_sync(&mddev
->safemode_timer
);
3776 blk_set_stacking_limits(&mddev
->queue
->limits
);
3778 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
3779 mddev_resume(mddev
);
3781 md_update_sb(mddev
, 1);
3782 sysfs_notify(&mddev
->kobj
, NULL
, "level");
3783 md_new_event(mddev
);
3786 mddev_unlock(mddev
);
3790 static struct md_sysfs_entry md_level
=
3791 __ATTR(level
, S_IRUGO
|S_IWUSR
, level_show
, level_store
);
3794 layout_show(struct mddev
*mddev
, char *page
)
3796 /* just a number, not meaningful for all levels */
3797 if (mddev
->reshape_position
!= MaxSector
&&
3798 mddev
->layout
!= mddev
->new_layout
)
3799 return sprintf(page
, "%d (%d)\n",
3800 mddev
->new_layout
, mddev
->layout
);
3801 return sprintf(page
, "%d\n", mddev
->layout
);
3805 layout_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3810 err
= kstrtouint(buf
, 10, &n
);
3813 err
= mddev_lock(mddev
);
3818 if (mddev
->pers
->check_reshape
== NULL
)
3823 mddev
->new_layout
= n
;
3824 err
= mddev
->pers
->check_reshape(mddev
);
3826 mddev
->new_layout
= mddev
->layout
;
3829 mddev
->new_layout
= n
;
3830 if (mddev
->reshape_position
== MaxSector
)
3833 mddev_unlock(mddev
);
3836 static struct md_sysfs_entry md_layout
=
3837 __ATTR(layout
, S_IRUGO
|S_IWUSR
, layout_show
, layout_store
);
3840 raid_disks_show(struct mddev
*mddev
, char *page
)
3842 if (mddev
->raid_disks
== 0)
3844 if (mddev
->reshape_position
!= MaxSector
&&
3845 mddev
->delta_disks
!= 0)
3846 return sprintf(page
, "%d (%d)\n", mddev
->raid_disks
,
3847 mddev
->raid_disks
- mddev
->delta_disks
);
3848 return sprintf(page
, "%d\n", mddev
->raid_disks
);
3851 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
);
3854 raid_disks_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3859 err
= kstrtouint(buf
, 10, &n
);
3863 err
= mddev_lock(mddev
);
3867 err
= update_raid_disks(mddev
, n
);
3868 else if (mddev
->reshape_position
!= MaxSector
) {
3869 struct md_rdev
*rdev
;
3870 int olddisks
= mddev
->raid_disks
- mddev
->delta_disks
;
3873 rdev_for_each(rdev
, mddev
) {
3875 rdev
->data_offset
< rdev
->new_data_offset
)
3878 rdev
->data_offset
> rdev
->new_data_offset
)
3882 mddev
->delta_disks
= n
- olddisks
;
3883 mddev
->raid_disks
= n
;
3884 mddev
->reshape_backwards
= (mddev
->delta_disks
< 0);
3886 mddev
->raid_disks
= n
;
3888 mddev_unlock(mddev
);
3889 return err
? err
: len
;
3891 static struct md_sysfs_entry md_raid_disks
=
3892 __ATTR(raid_disks
, S_IRUGO
|S_IWUSR
, raid_disks_show
, raid_disks_store
);
3895 chunk_size_show(struct mddev
*mddev
, char *page
)
3897 if (mddev
->reshape_position
!= MaxSector
&&
3898 mddev
->chunk_sectors
!= mddev
->new_chunk_sectors
)
3899 return sprintf(page
, "%d (%d)\n",
3900 mddev
->new_chunk_sectors
<< 9,
3901 mddev
->chunk_sectors
<< 9);
3902 return sprintf(page
, "%d\n", mddev
->chunk_sectors
<< 9);
3906 chunk_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3911 err
= kstrtoul(buf
, 10, &n
);
3915 err
= mddev_lock(mddev
);
3919 if (mddev
->pers
->check_reshape
== NULL
)
3924 mddev
->new_chunk_sectors
= n
>> 9;
3925 err
= mddev
->pers
->check_reshape(mddev
);
3927 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3930 mddev
->new_chunk_sectors
= n
>> 9;
3931 if (mddev
->reshape_position
== MaxSector
)
3932 mddev
->chunk_sectors
= n
>> 9;
3934 mddev_unlock(mddev
);
3937 static struct md_sysfs_entry md_chunk_size
=
3938 __ATTR(chunk_size
, S_IRUGO
|S_IWUSR
, chunk_size_show
, chunk_size_store
);
3941 resync_start_show(struct mddev
*mddev
, char *page
)
3943 if (mddev
->recovery_cp
== MaxSector
)
3944 return sprintf(page
, "none\n");
3945 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->recovery_cp
);
3949 resync_start_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3951 unsigned long long n
;
3954 if (cmd_match(buf
, "none"))
3957 err
= kstrtoull(buf
, 10, &n
);
3960 if (n
!= (sector_t
)n
)
3964 err
= mddev_lock(mddev
);
3967 if (mddev
->pers
&& !test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
3971 mddev
->recovery_cp
= n
;
3973 set_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
3975 mddev_unlock(mddev
);
3978 static struct md_sysfs_entry md_resync_start
=
3979 __ATTR_PREALLOC(resync_start
, S_IRUGO
|S_IWUSR
,
3980 resync_start_show
, resync_start_store
);
3983 * The array state can be:
3986 * No devices, no size, no level
3987 * Equivalent to STOP_ARRAY ioctl
3989 * May have some settings, but array is not active
3990 * all IO results in error
3991 * When written, doesn't tear down array, but just stops it
3992 * suspended (not supported yet)
3993 * All IO requests will block. The array can be reconfigured.
3994 * Writing this, if accepted, will block until array is quiescent
3996 * no resync can happen. no superblocks get written.
3997 * write requests fail
3999 * like readonly, but behaves like 'clean' on a write request.
4001 * clean - no pending writes, but otherwise active.
4002 * When written to inactive array, starts without resync
4003 * If a write request arrives then
4004 * if metadata is known, mark 'dirty' and switch to 'active'.
4005 * if not known, block and switch to write-pending
4006 * If written to an active array that has pending writes, then fails.
4008 * fully active: IO and resync can be happening.
4009 * When written to inactive array, starts with resync
4012 * clean, but writes are blocked waiting for 'active' to be written.
4015 * like active, but no writes have been seen for a while (100msec).
4018 enum array_state
{ clear
, inactive
, suspended
, readonly
, read_auto
, clean
, active
,
4019 write_pending
, active_idle
, bad_word
};
4020 static char *array_states
[] = {
4021 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
4022 "write-pending", "active-idle", NULL
};
4024 static int match_word(const char *word
, char **list
)
4027 for (n
=0; list
[n
]; n
++)
4028 if (cmd_match(word
, list
[n
]))
4034 array_state_show(struct mddev
*mddev
, char *page
)
4036 enum array_state st
= inactive
;
4047 spin_lock(&mddev
->lock
);
4048 if (test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
))
4050 else if (mddev
->in_sync
)
4052 else if (mddev
->safemode
)
4056 spin_unlock(&mddev
->lock
);
4059 if (list_empty(&mddev
->disks
) &&
4060 mddev
->raid_disks
== 0 &&
4061 mddev
->dev_sectors
== 0)
4066 return sprintf(page
, "%s\n", array_states
[st
]);
4069 static int do_md_stop(struct mddev
*mddev
, int ro
, struct block_device
*bdev
);
4070 static int md_set_readonly(struct mddev
*mddev
, struct block_device
*bdev
);
4071 static int do_md_run(struct mddev
*mddev
);
4072 static int restart_array(struct mddev
*mddev
);
4075 array_state_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4078 enum array_state st
= match_word(buf
, array_states
);
4080 if (mddev
->pers
&& (st
== active
|| st
== clean
) && mddev
->ro
!= 1) {
4081 /* don't take reconfig_mutex when toggling between
4084 spin_lock(&mddev
->lock
);
4086 restart_array(mddev
);
4087 clear_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
4088 md_wakeup_thread(mddev
->thread
);
4089 wake_up(&mddev
->sb_wait
);
4090 } else /* st == clean */ {
4091 restart_array(mddev
);
4092 if (!set_in_sync(mddev
))
4096 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4097 spin_unlock(&mddev
->lock
);
4100 err
= mddev_lock(mddev
);
4108 /* stopping an active array */
4109 err
= do_md_stop(mddev
, 0, NULL
);
4112 /* stopping an active array */
4114 err
= do_md_stop(mddev
, 2, NULL
);
4116 err
= 0; /* already inactive */
4119 break; /* not supported yet */
4122 err
= md_set_readonly(mddev
, NULL
);
4125 set_disk_ro(mddev
->gendisk
, 1);
4126 err
= do_md_run(mddev
);
4132 err
= md_set_readonly(mddev
, NULL
);
4133 else if (mddev
->ro
== 1)
4134 err
= restart_array(mddev
);
4137 set_disk_ro(mddev
->gendisk
, 0);
4141 err
= do_md_run(mddev
);
4146 err
= restart_array(mddev
);
4149 spin_lock(&mddev
->lock
);
4150 if (!set_in_sync(mddev
))
4152 spin_unlock(&mddev
->lock
);
4158 err
= restart_array(mddev
);
4161 clear_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
4162 wake_up(&mddev
->sb_wait
);
4166 set_disk_ro(mddev
->gendisk
, 0);
4167 err
= do_md_run(mddev
);
4172 /* these cannot be set */
4177 if (mddev
->hold_active
== UNTIL_IOCTL
)
4178 mddev
->hold_active
= 0;
4179 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4181 mddev_unlock(mddev
);
4184 static struct md_sysfs_entry md_array_state
=
4185 __ATTR_PREALLOC(array_state
, S_IRUGO
|S_IWUSR
, array_state_show
, array_state_store
);
4188 max_corrected_read_errors_show(struct mddev
*mddev
, char *page
) {
4189 return sprintf(page
, "%d\n",
4190 atomic_read(&mddev
->max_corr_read_errors
));
4194 max_corrected_read_errors_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4199 rv
= kstrtouint(buf
, 10, &n
);
4202 atomic_set(&mddev
->max_corr_read_errors
, n
);
4206 static struct md_sysfs_entry max_corr_read_errors
=
4207 __ATTR(max_read_errors
, S_IRUGO
|S_IWUSR
, max_corrected_read_errors_show
,
4208 max_corrected_read_errors_store
);
4211 null_show(struct mddev
*mddev
, char *page
)
4217 new_dev_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4219 /* buf must be %d:%d\n? giving major and minor numbers */
4220 /* The new device is added to the array.
4221 * If the array has a persistent superblock, we read the
4222 * superblock to initialise info and check validity.
4223 * Otherwise, only checking done is that in bind_rdev_to_array,
4224 * which mainly checks size.
4227 int major
= simple_strtoul(buf
, &e
, 10);
4230 struct md_rdev
*rdev
;
4233 if (!*buf
|| *e
!= ':' || !e
[1] || e
[1] == '\n')
4235 minor
= simple_strtoul(e
+1, &e
, 10);
4236 if (*e
&& *e
!= '\n')
4238 dev
= MKDEV(major
, minor
);
4239 if (major
!= MAJOR(dev
) ||
4240 minor
!= MINOR(dev
))
4243 flush_workqueue(md_misc_wq
);
4245 err
= mddev_lock(mddev
);
4248 if (mddev
->persistent
) {
4249 rdev
= md_import_device(dev
, mddev
->major_version
,
4250 mddev
->minor_version
);
4251 if (!IS_ERR(rdev
) && !list_empty(&mddev
->disks
)) {
4252 struct md_rdev
*rdev0
4253 = list_entry(mddev
->disks
.next
,
4254 struct md_rdev
, same_set
);
4255 err
= super_types
[mddev
->major_version
]
4256 .load_super(rdev
, rdev0
, mddev
->minor_version
);
4260 } else if (mddev
->external
)
4261 rdev
= md_import_device(dev
, -2, -1);
4263 rdev
= md_import_device(dev
, -1, -1);
4266 mddev_unlock(mddev
);
4267 return PTR_ERR(rdev
);
4269 err
= bind_rdev_to_array(rdev
, mddev
);
4273 mddev_unlock(mddev
);
4274 return err
? err
: len
;
4277 static struct md_sysfs_entry md_new_device
=
4278 __ATTR(new_dev
, S_IWUSR
, null_show
, new_dev_store
);
4281 bitmap_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4284 unsigned long chunk
, end_chunk
;
4287 err
= mddev_lock(mddev
);
4292 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
4294 chunk
= end_chunk
= simple_strtoul(buf
, &end
, 0);
4295 if (buf
== end
) break;
4296 if (*end
== '-') { /* range */
4298 end_chunk
= simple_strtoul(buf
, &end
, 0);
4299 if (buf
== end
) break;
4301 if (*end
&& !isspace(*end
)) break;
4302 bitmap_dirty_bits(mddev
->bitmap
, chunk
, end_chunk
);
4303 buf
= skip_spaces(end
);
4305 bitmap_unplug(mddev
->bitmap
); /* flush the bits to disk */
4307 mddev_unlock(mddev
);
4311 static struct md_sysfs_entry md_bitmap
=
4312 __ATTR(bitmap_set_bits
, S_IWUSR
, null_show
, bitmap_store
);
4315 size_show(struct mddev
*mddev
, char *page
)
4317 return sprintf(page
, "%llu\n",
4318 (unsigned long long)mddev
->dev_sectors
/ 2);
4321 static int update_size(struct mddev
*mddev
, sector_t num_sectors
);
4324 size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4326 /* If array is inactive, we can reduce the component size, but
4327 * not increase it (except from 0).
4328 * If array is active, we can try an on-line resize
4331 int err
= strict_blocks_to_sectors(buf
, §ors
);
4335 err
= mddev_lock(mddev
);
4339 err
= update_size(mddev
, sectors
);
4341 md_update_sb(mddev
, 1);
4343 if (mddev
->dev_sectors
== 0 ||
4344 mddev
->dev_sectors
> sectors
)
4345 mddev
->dev_sectors
= sectors
;
4349 mddev_unlock(mddev
);
4350 return err
? err
: len
;
4353 static struct md_sysfs_entry md_size
=
4354 __ATTR(component_size
, S_IRUGO
|S_IWUSR
, size_show
, size_store
);
4356 /* Metadata version.
4358 * 'none' for arrays with no metadata (good luck...)
4359 * 'external' for arrays with externally managed metadata,
4360 * or N.M for internally known formats
4363 metadata_show(struct mddev
*mddev
, char *page
)
4365 if (mddev
->persistent
)
4366 return sprintf(page
, "%d.%d\n",
4367 mddev
->major_version
, mddev
->minor_version
);
4368 else if (mddev
->external
)
4369 return sprintf(page
, "external:%s\n", mddev
->metadata_type
);
4371 return sprintf(page
, "none\n");
4375 metadata_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4380 /* Changing the details of 'external' metadata is
4381 * always permitted. Otherwise there must be
4382 * no devices attached to the array.
4385 err
= mddev_lock(mddev
);
4389 if (mddev
->external
&& strncmp(buf
, "external:", 9) == 0)
4391 else if (!list_empty(&mddev
->disks
))
4395 if (cmd_match(buf
, "none")) {
4396 mddev
->persistent
= 0;
4397 mddev
->external
= 0;
4398 mddev
->major_version
= 0;
4399 mddev
->minor_version
= 90;
4402 if (strncmp(buf
, "external:", 9) == 0) {
4403 size_t namelen
= len
-9;
4404 if (namelen
>= sizeof(mddev
->metadata_type
))
4405 namelen
= sizeof(mddev
->metadata_type
)-1;
4406 strncpy(mddev
->metadata_type
, buf
+9, namelen
);
4407 mddev
->metadata_type
[namelen
] = 0;
4408 if (namelen
&& mddev
->metadata_type
[namelen
-1] == '\n')
4409 mddev
->metadata_type
[--namelen
] = 0;
4410 mddev
->persistent
= 0;
4411 mddev
->external
= 1;
4412 mddev
->major_version
= 0;
4413 mddev
->minor_version
= 90;
4416 major
= simple_strtoul(buf
, &e
, 10);
4418 if (e
==buf
|| *e
!= '.')
4421 minor
= simple_strtoul(buf
, &e
, 10);
4422 if (e
==buf
|| (*e
&& *e
!= '\n') )
4425 if (major
>= ARRAY_SIZE(super_types
) || super_types
[major
].name
== NULL
)
4427 mddev
->major_version
= major
;
4428 mddev
->minor_version
= minor
;
4429 mddev
->persistent
= 1;
4430 mddev
->external
= 0;
4433 mddev_unlock(mddev
);
4437 static struct md_sysfs_entry md_metadata
=
4438 __ATTR_PREALLOC(metadata_version
, S_IRUGO
|S_IWUSR
, metadata_show
, metadata_store
);
4441 action_show(struct mddev
*mddev
, char *page
)
4443 char *type
= "idle";
4444 unsigned long recovery
= mddev
->recovery
;
4445 if (test_bit(MD_RECOVERY_FROZEN
, &recovery
))
4447 else if (test_bit(MD_RECOVERY_RUNNING
, &recovery
) ||
4448 (!mddev
->ro
&& test_bit(MD_RECOVERY_NEEDED
, &recovery
))) {
4449 if (test_bit(MD_RECOVERY_RESHAPE
, &recovery
))
4451 else if (test_bit(MD_RECOVERY_SYNC
, &recovery
)) {
4452 if (!test_bit(MD_RECOVERY_REQUESTED
, &recovery
))
4454 else if (test_bit(MD_RECOVERY_CHECK
, &recovery
))
4458 } else if (test_bit(MD_RECOVERY_RECOVER
, &recovery
))
4460 else if (mddev
->reshape_position
!= MaxSector
)
4463 return sprintf(page
, "%s\n", type
);
4467 action_store(struct mddev
*mddev
, const char *page
, size_t len
)
4469 if (!mddev
->pers
|| !mddev
->pers
->sync_request
)
4473 if (cmd_match(page
, "idle") || cmd_match(page
, "frozen")) {
4474 if (cmd_match(page
, "frozen"))
4475 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4477 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4478 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
4479 mddev_lock(mddev
) == 0) {
4480 flush_workqueue(md_misc_wq
);
4481 if (mddev
->sync_thread
) {
4482 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4483 md_reap_sync_thread(mddev
);
4485 mddev_unlock(mddev
);
4487 } else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4489 else if (cmd_match(page
, "resync"))
4490 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4491 else if (cmd_match(page
, "recover")) {
4492 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4493 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
4494 } else if (cmd_match(page
, "reshape")) {
4496 if (mddev
->pers
->start_reshape
== NULL
)
4498 err
= mddev_lock(mddev
);
4500 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4503 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4504 err
= mddev
->pers
->start_reshape(mddev
);
4506 mddev_unlock(mddev
);
4510 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
4512 if (cmd_match(page
, "check"))
4513 set_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
4514 else if (!cmd_match(page
, "repair"))
4516 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4517 set_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
4518 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
4520 if (mddev
->ro
== 2) {
4521 /* A write to sync_action is enough to justify
4522 * canceling read-auto mode
4525 md_wakeup_thread(mddev
->sync_thread
);
4527 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4528 md_wakeup_thread(mddev
->thread
);
4529 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
4533 static struct md_sysfs_entry md_scan_mode
=
4534 __ATTR_PREALLOC(sync_action
, S_IRUGO
|S_IWUSR
, action_show
, action_store
);
4537 last_sync_action_show(struct mddev
*mddev
, char *page
)
4539 return sprintf(page
, "%s\n", mddev
->last_sync_action
);
4542 static struct md_sysfs_entry md_last_scan_mode
= __ATTR_RO(last_sync_action
);
4545 mismatch_cnt_show(struct mddev
*mddev
, char *page
)
4547 return sprintf(page
, "%llu\n",
4548 (unsigned long long)
4549 atomic64_read(&mddev
->resync_mismatches
));
4552 static struct md_sysfs_entry md_mismatches
= __ATTR_RO(mismatch_cnt
);
4555 sync_min_show(struct mddev
*mddev
, char *page
)
4557 return sprintf(page
, "%d (%s)\n", speed_min(mddev
),
4558 mddev
->sync_speed_min
? "local": "system");
4562 sync_min_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4567 if (strncmp(buf
, "system", 6)==0) {
4570 rv
= kstrtouint(buf
, 10, &min
);
4576 mddev
->sync_speed_min
= min
;
4580 static struct md_sysfs_entry md_sync_min
=
4581 __ATTR(sync_speed_min
, S_IRUGO
|S_IWUSR
, sync_min_show
, sync_min_store
);
4584 sync_max_show(struct mddev
*mddev
, char *page
)
4586 return sprintf(page
, "%d (%s)\n", speed_max(mddev
),
4587 mddev
->sync_speed_max
? "local": "system");
4591 sync_max_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4596 if (strncmp(buf
, "system", 6)==0) {
4599 rv
= kstrtouint(buf
, 10, &max
);
4605 mddev
->sync_speed_max
= max
;
4609 static struct md_sysfs_entry md_sync_max
=
4610 __ATTR(sync_speed_max
, S_IRUGO
|S_IWUSR
, sync_max_show
, sync_max_store
);
4613 degraded_show(struct mddev
*mddev
, char *page
)
4615 return sprintf(page
, "%d\n", mddev
->degraded
);
4617 static struct md_sysfs_entry md_degraded
= __ATTR_RO(degraded
);
4620 sync_force_parallel_show(struct mddev
*mddev
, char *page
)
4622 return sprintf(page
, "%d\n", mddev
->parallel_resync
);
4626 sync_force_parallel_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4630 if (kstrtol(buf
, 10, &n
))
4633 if (n
!= 0 && n
!= 1)
4636 mddev
->parallel_resync
= n
;
4638 if (mddev
->sync_thread
)
4639 wake_up(&resync_wait
);
4644 /* force parallel resync, even with shared block devices */
4645 static struct md_sysfs_entry md_sync_force_parallel
=
4646 __ATTR(sync_force_parallel
, S_IRUGO
|S_IWUSR
,
4647 sync_force_parallel_show
, sync_force_parallel_store
);
4650 sync_speed_show(struct mddev
*mddev
, char *page
)
4652 unsigned long resync
, dt
, db
;
4653 if (mddev
->curr_resync
== 0)
4654 return sprintf(page
, "none\n");
4655 resync
= mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
);
4656 dt
= (jiffies
- mddev
->resync_mark
) / HZ
;
4658 db
= resync
- mddev
->resync_mark_cnt
;
4659 return sprintf(page
, "%lu\n", db
/dt
/2); /* K/sec */
4662 static struct md_sysfs_entry md_sync_speed
= __ATTR_RO(sync_speed
);
4665 sync_completed_show(struct mddev
*mddev
, char *page
)
4667 unsigned long long max_sectors
, resync
;
4669 if (!test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4670 return sprintf(page
, "none\n");
4672 if (mddev
->curr_resync
== 1 ||
4673 mddev
->curr_resync
== 2)
4674 return sprintf(page
, "delayed\n");
4676 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
4677 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
4678 max_sectors
= mddev
->resync_max_sectors
;
4680 max_sectors
= mddev
->dev_sectors
;
4682 resync
= mddev
->curr_resync_completed
;
4683 return sprintf(page
, "%llu / %llu\n", resync
, max_sectors
);
4686 static struct md_sysfs_entry md_sync_completed
=
4687 __ATTR_PREALLOC(sync_completed
, S_IRUGO
, sync_completed_show
, NULL
);
4690 min_sync_show(struct mddev
*mddev
, char *page
)
4692 return sprintf(page
, "%llu\n",
4693 (unsigned long long)mddev
->resync_min
);
4696 min_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4698 unsigned long long min
;
4701 if (kstrtoull(buf
, 10, &min
))
4704 spin_lock(&mddev
->lock
);
4706 if (min
> mddev
->resync_max
)
4710 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4713 /* Round down to multiple of 4K for safety */
4714 mddev
->resync_min
= round_down(min
, 8);
4718 spin_unlock(&mddev
->lock
);
4722 static struct md_sysfs_entry md_min_sync
=
4723 __ATTR(sync_min
, S_IRUGO
|S_IWUSR
, min_sync_show
, min_sync_store
);
4726 max_sync_show(struct mddev
*mddev
, char *page
)
4728 if (mddev
->resync_max
== MaxSector
)
4729 return sprintf(page
, "max\n");
4731 return sprintf(page
, "%llu\n",
4732 (unsigned long long)mddev
->resync_max
);
4735 max_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4738 spin_lock(&mddev
->lock
);
4739 if (strncmp(buf
, "max", 3) == 0)
4740 mddev
->resync_max
= MaxSector
;
4742 unsigned long long max
;
4746 if (kstrtoull(buf
, 10, &max
))
4748 if (max
< mddev
->resync_min
)
4752 if (max
< mddev
->resync_max
&&
4754 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4757 /* Must be a multiple of chunk_size */
4758 chunk
= mddev
->chunk_sectors
;
4760 sector_t temp
= max
;
4763 if (sector_div(temp
, chunk
))
4766 mddev
->resync_max
= max
;
4768 wake_up(&mddev
->recovery_wait
);
4771 spin_unlock(&mddev
->lock
);
4775 static struct md_sysfs_entry md_max_sync
=
4776 __ATTR(sync_max
, S_IRUGO
|S_IWUSR
, max_sync_show
, max_sync_store
);
4779 suspend_lo_show(struct mddev
*mddev
, char *page
)
4781 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_lo
);
4785 suspend_lo_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4787 unsigned long long old
, new;
4790 err
= kstrtoull(buf
, 10, &new);
4793 if (new != (sector_t
)new)
4796 err
= mddev_lock(mddev
);
4800 if (mddev
->pers
== NULL
||
4801 mddev
->pers
->quiesce
== NULL
)
4803 old
= mddev
->suspend_lo
;
4804 mddev
->suspend_lo
= new;
4806 /* Shrinking suspended region */
4807 mddev
->pers
->quiesce(mddev
, 2);
4809 /* Expanding suspended region - need to wait */
4810 mddev
->pers
->quiesce(mddev
, 1);
4811 mddev
->pers
->quiesce(mddev
, 0);
4815 mddev_unlock(mddev
);
4818 static struct md_sysfs_entry md_suspend_lo
=
4819 __ATTR(suspend_lo
, S_IRUGO
|S_IWUSR
, suspend_lo_show
, suspend_lo_store
);
4822 suspend_hi_show(struct mddev
*mddev
, char *page
)
4824 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_hi
);
4828 suspend_hi_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4830 unsigned long long old
, new;
4833 err
= kstrtoull(buf
, 10, &new);
4836 if (new != (sector_t
)new)
4839 err
= mddev_lock(mddev
);
4843 if (mddev
->pers
== NULL
||
4844 mddev
->pers
->quiesce
== NULL
)
4846 old
= mddev
->suspend_hi
;
4847 mddev
->suspend_hi
= new;
4849 /* Shrinking suspended region */
4850 mddev
->pers
->quiesce(mddev
, 2);
4852 /* Expanding suspended region - need to wait */
4853 mddev
->pers
->quiesce(mddev
, 1);
4854 mddev
->pers
->quiesce(mddev
, 0);
4858 mddev_unlock(mddev
);
4861 static struct md_sysfs_entry md_suspend_hi
=
4862 __ATTR(suspend_hi
, S_IRUGO
|S_IWUSR
, suspend_hi_show
, suspend_hi_store
);
4865 reshape_position_show(struct mddev
*mddev
, char *page
)
4867 if (mddev
->reshape_position
!= MaxSector
)
4868 return sprintf(page
, "%llu\n",
4869 (unsigned long long)mddev
->reshape_position
);
4870 strcpy(page
, "none\n");
4875 reshape_position_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4877 struct md_rdev
*rdev
;
4878 unsigned long long new;
4881 err
= kstrtoull(buf
, 10, &new);
4884 if (new != (sector_t
)new)
4886 err
= mddev_lock(mddev
);
4892 mddev
->reshape_position
= new;
4893 mddev
->delta_disks
= 0;
4894 mddev
->reshape_backwards
= 0;
4895 mddev
->new_level
= mddev
->level
;
4896 mddev
->new_layout
= mddev
->layout
;
4897 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
4898 rdev_for_each(rdev
, mddev
)
4899 rdev
->new_data_offset
= rdev
->data_offset
;
4902 mddev_unlock(mddev
);
4906 static struct md_sysfs_entry md_reshape_position
=
4907 __ATTR(reshape_position
, S_IRUGO
|S_IWUSR
, reshape_position_show
,
4908 reshape_position_store
);
4911 reshape_direction_show(struct mddev
*mddev
, char *page
)
4913 return sprintf(page
, "%s\n",
4914 mddev
->reshape_backwards
? "backwards" : "forwards");
4918 reshape_direction_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4923 if (cmd_match(buf
, "forwards"))
4925 else if (cmd_match(buf
, "backwards"))
4929 if (mddev
->reshape_backwards
== backwards
)
4932 err
= mddev_lock(mddev
);
4935 /* check if we are allowed to change */
4936 if (mddev
->delta_disks
)
4938 else if (mddev
->persistent
&&
4939 mddev
->major_version
== 0)
4942 mddev
->reshape_backwards
= backwards
;
4943 mddev_unlock(mddev
);
4947 static struct md_sysfs_entry md_reshape_direction
=
4948 __ATTR(reshape_direction
, S_IRUGO
|S_IWUSR
, reshape_direction_show
,
4949 reshape_direction_store
);
4952 array_size_show(struct mddev
*mddev
, char *page
)
4954 if (mddev
->external_size
)
4955 return sprintf(page
, "%llu\n",
4956 (unsigned long long)mddev
->array_sectors
/2);
4958 return sprintf(page
, "default\n");
4962 array_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4967 err
= mddev_lock(mddev
);
4971 /* cluster raid doesn't support change array_sectors */
4972 if (mddev_is_clustered(mddev
)) {
4973 mddev_unlock(mddev
);
4977 if (strncmp(buf
, "default", 7) == 0) {
4979 sectors
= mddev
->pers
->size(mddev
, 0, 0);
4981 sectors
= mddev
->array_sectors
;
4983 mddev
->external_size
= 0;
4985 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
4987 else if (mddev
->pers
&& mddev
->pers
->size(mddev
, 0, 0) < sectors
)
4990 mddev
->external_size
= 1;
4994 mddev
->array_sectors
= sectors
;
4996 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
4997 revalidate_disk(mddev
->gendisk
);
5000 mddev_unlock(mddev
);
5004 static struct md_sysfs_entry md_array_size
=
5005 __ATTR(array_size
, S_IRUGO
|S_IWUSR
, array_size_show
,
5009 consistency_policy_show(struct mddev
*mddev
, char *page
)
5013 if (test_bit(MD_HAS_JOURNAL
, &mddev
->flags
)) {
5014 ret
= sprintf(page
, "journal\n");
5015 } else if (test_bit(MD_HAS_PPL
, &mddev
->flags
)) {
5016 ret
= sprintf(page
, "ppl\n");
5017 } else if (mddev
->bitmap
) {
5018 ret
= sprintf(page
, "bitmap\n");
5019 } else if (mddev
->pers
) {
5020 if (mddev
->pers
->sync_request
)
5021 ret
= sprintf(page
, "resync\n");
5023 ret
= sprintf(page
, "none\n");
5025 ret
= sprintf(page
, "unknown\n");
5032 consistency_policy_store(struct mddev
*mddev
, const char *buf
, size_t len
)
5037 if (mddev
->pers
->change_consistency_policy
)
5038 err
= mddev
->pers
->change_consistency_policy(mddev
, buf
);
5041 } else if (mddev
->external
&& strncmp(buf
, "ppl", 3) == 0) {
5042 set_bit(MD_HAS_PPL
, &mddev
->flags
);
5047 return err
? err
: len
;
5050 static struct md_sysfs_entry md_consistency_policy
=
5051 __ATTR(consistency_policy
, S_IRUGO
| S_IWUSR
, consistency_policy_show
,
5052 consistency_policy_store
);
5054 static struct attribute
*md_default_attrs
[] = {
5057 &md_raid_disks
.attr
,
5058 &md_chunk_size
.attr
,
5060 &md_resync_start
.attr
,
5062 &md_new_device
.attr
,
5063 &md_safe_delay
.attr
,
5064 &md_array_state
.attr
,
5065 &md_reshape_position
.attr
,
5066 &md_reshape_direction
.attr
,
5067 &md_array_size
.attr
,
5068 &max_corr_read_errors
.attr
,
5069 &md_consistency_policy
.attr
,
5073 static struct attribute
*md_redundancy_attrs
[] = {
5075 &md_last_scan_mode
.attr
,
5076 &md_mismatches
.attr
,
5079 &md_sync_speed
.attr
,
5080 &md_sync_force_parallel
.attr
,
5081 &md_sync_completed
.attr
,
5084 &md_suspend_lo
.attr
,
5085 &md_suspend_hi
.attr
,
5090 static struct attribute_group md_redundancy_group
= {
5092 .attrs
= md_redundancy_attrs
,
5096 md_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
5098 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
5099 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
5104 spin_lock(&all_mddevs_lock
);
5105 if (list_empty(&mddev
->all_mddevs
)) {
5106 spin_unlock(&all_mddevs_lock
);
5110 spin_unlock(&all_mddevs_lock
);
5112 rv
= entry
->show(mddev
, page
);
5118 md_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
5119 const char *page
, size_t length
)
5121 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
5122 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
5127 if (!capable(CAP_SYS_ADMIN
))
5129 spin_lock(&all_mddevs_lock
);
5130 if (list_empty(&mddev
->all_mddevs
)) {
5131 spin_unlock(&all_mddevs_lock
);
5135 spin_unlock(&all_mddevs_lock
);
5136 rv
= entry
->store(mddev
, page
, length
);
5141 static void md_free(struct kobject
*ko
)
5143 struct mddev
*mddev
= container_of(ko
, struct mddev
, kobj
);
5145 if (mddev
->sysfs_state
)
5146 sysfs_put(mddev
->sysfs_state
);
5149 blk_cleanup_queue(mddev
->queue
);
5150 if (mddev
->gendisk
) {
5151 del_gendisk(mddev
->gendisk
);
5152 put_disk(mddev
->gendisk
);
5154 percpu_ref_exit(&mddev
->writes_pending
);
5159 static const struct sysfs_ops md_sysfs_ops
= {
5160 .show
= md_attr_show
,
5161 .store
= md_attr_store
,
5163 static struct kobj_type md_ktype
= {
5165 .sysfs_ops
= &md_sysfs_ops
,
5166 .default_attrs
= md_default_attrs
,
5171 static void mddev_delayed_delete(struct work_struct
*ws
)
5173 struct mddev
*mddev
= container_of(ws
, struct mddev
, del_work
);
5175 sysfs_remove_group(&mddev
->kobj
, &md_bitmap_group
);
5176 kobject_del(&mddev
->kobj
);
5177 kobject_put(&mddev
->kobj
);
5180 static void no_op(struct percpu_ref
*r
) {}
5182 int mddev_init_writes_pending(struct mddev
*mddev
)
5184 if (mddev
->writes_pending
.percpu_count_ptr
)
5186 if (percpu_ref_init(&mddev
->writes_pending
, no_op
, 0, GFP_KERNEL
) < 0)
5188 /* We want to start with the refcount at zero */
5189 percpu_ref_put(&mddev
->writes_pending
);
5192 EXPORT_SYMBOL_GPL(mddev_init_writes_pending
);
5194 static int md_alloc(dev_t dev
, char *name
)
5197 * If dev is zero, name is the name of a device to allocate with
5198 * an arbitrary minor number. It will be "md_???"
5199 * If dev is non-zero it must be a device number with a MAJOR of
5200 * MD_MAJOR or mdp_major. In this case, if "name" is NULL, then
5201 * the device is being created by opening a node in /dev.
5202 * If "name" is not NULL, the device is being created by
5203 * writing to /sys/module/md_mod/parameters/new_array.
5205 static DEFINE_MUTEX(disks_mutex
);
5206 struct mddev
*mddev
= mddev_find(dev
);
5207 struct gendisk
*disk
;
5216 partitioned
= (MAJOR(mddev
->unit
) != MD_MAJOR
);
5217 shift
= partitioned
? MdpMinorShift
: 0;
5218 unit
= MINOR(mddev
->unit
) >> shift
;
5220 /* wait for any previous instance of this device to be
5221 * completely removed (mddev_delayed_delete).
5223 flush_workqueue(md_misc_wq
);
5225 mutex_lock(&disks_mutex
);
5231 /* Need to ensure that 'name' is not a duplicate.
5233 struct mddev
*mddev2
;
5234 spin_lock(&all_mddevs_lock
);
5236 list_for_each_entry(mddev2
, &all_mddevs
, all_mddevs
)
5237 if (mddev2
->gendisk
&&
5238 strcmp(mddev2
->gendisk
->disk_name
, name
) == 0) {
5239 spin_unlock(&all_mddevs_lock
);
5242 spin_unlock(&all_mddevs_lock
);
5246 * Creating /dev/mdNNN via "newarray", so adjust hold_active.
5248 mddev
->hold_active
= UNTIL_STOP
;
5251 mddev
->queue
= blk_alloc_queue(GFP_KERNEL
);
5254 mddev
->queue
->queuedata
= mddev
;
5256 blk_queue_make_request(mddev
->queue
, md_make_request
);
5257 blk_set_stacking_limits(&mddev
->queue
->limits
);
5259 disk
= alloc_disk(1 << shift
);
5261 blk_cleanup_queue(mddev
->queue
);
5262 mddev
->queue
= NULL
;
5265 disk
->major
= MAJOR(mddev
->unit
);
5266 disk
->first_minor
= unit
<< shift
;
5268 strcpy(disk
->disk_name
, name
);
5269 else if (partitioned
)
5270 sprintf(disk
->disk_name
, "md_d%d", unit
);
5272 sprintf(disk
->disk_name
, "md%d", unit
);
5273 disk
->fops
= &md_fops
;
5274 disk
->private_data
= mddev
;
5275 disk
->queue
= mddev
->queue
;
5276 blk_queue_write_cache(mddev
->queue
, true, true);
5277 /* Allow extended partitions. This makes the
5278 * 'mdp' device redundant, but we can't really
5281 disk
->flags
|= GENHD_FL_EXT_DEVT
;
5282 mddev
->gendisk
= disk
;
5283 /* As soon as we call add_disk(), another thread could get
5284 * through to md_open, so make sure it doesn't get too far
5286 mutex_lock(&mddev
->open_mutex
);
5289 error
= kobject_init_and_add(&mddev
->kobj
, &md_ktype
,
5290 &disk_to_dev(disk
)->kobj
, "%s", "md");
5292 /* This isn't possible, but as kobject_init_and_add is marked
5293 * __must_check, we must do something with the result
5295 pr_debug("md: cannot register %s/md - name in use\n",
5299 if (mddev
->kobj
.sd
&&
5300 sysfs_create_group(&mddev
->kobj
, &md_bitmap_group
))
5301 pr_debug("pointless warning\n");
5302 mutex_unlock(&mddev
->open_mutex
);
5304 mutex_unlock(&disks_mutex
);
5305 if (!error
&& mddev
->kobj
.sd
) {
5306 kobject_uevent(&mddev
->kobj
, KOBJ_ADD
);
5307 mddev
->sysfs_state
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "array_state");
5313 static struct kobject
*md_probe(dev_t dev
, int *part
, void *data
)
5316 md_alloc(dev
, NULL
);
5320 static int add_named_array(const char *val
, struct kernel_param
*kp
)
5323 * val must be "md_*" or "mdNNN".
5324 * For "md_*" we allocate an array with a large free minor number, and
5325 * set the name to val. val must not already be an active name.
5326 * For "mdNNN" we allocate an array with the minor number NNN
5327 * which must not already be in use.
5329 int len
= strlen(val
);
5330 char buf
[DISK_NAME_LEN
];
5331 unsigned long devnum
;
5333 while (len
&& val
[len
-1] == '\n')
5335 if (len
>= DISK_NAME_LEN
)
5337 strlcpy(buf
, val
, len
+1);
5338 if (strncmp(buf
, "md_", 3) == 0)
5339 return md_alloc(0, buf
);
5340 if (strncmp(buf
, "md", 2) == 0 &&
5342 kstrtoul(buf
+2, 10, &devnum
) == 0 &&
5343 devnum
<= MINORMASK
)
5344 return md_alloc(MKDEV(MD_MAJOR
, devnum
), NULL
);
5349 static void md_safemode_timeout(unsigned long data
)
5351 struct mddev
*mddev
= (struct mddev
*) data
;
5353 mddev
->safemode
= 1;
5354 if (mddev
->external
)
5355 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5357 md_wakeup_thread(mddev
->thread
);
5360 static int start_dirty_degraded
;
5362 int md_run(struct mddev
*mddev
)
5365 struct md_rdev
*rdev
;
5366 struct md_personality
*pers
;
5368 if (list_empty(&mddev
->disks
))
5369 /* cannot run an array with no devices.. */
5374 /* Cannot run until previous stop completes properly */
5375 if (mddev
->sysfs_active
)
5379 * Analyze all RAID superblock(s)
5381 if (!mddev
->raid_disks
) {
5382 if (!mddev
->persistent
)
5387 if (mddev
->level
!= LEVEL_NONE
)
5388 request_module("md-level-%d", mddev
->level
);
5389 else if (mddev
->clevel
[0])
5390 request_module("md-%s", mddev
->clevel
);
5393 * Drop all container device buffers, from now on
5394 * the only valid external interface is through the md
5397 rdev_for_each(rdev
, mddev
) {
5398 if (test_bit(Faulty
, &rdev
->flags
))
5400 sync_blockdev(rdev
->bdev
);
5401 invalidate_bdev(rdev
->bdev
);
5402 if (mddev
->ro
!= 1 &&
5403 (bdev_read_only(rdev
->bdev
) ||
5404 bdev_read_only(rdev
->meta_bdev
))) {
5407 set_disk_ro(mddev
->gendisk
, 1);
5410 /* perform some consistency tests on the device.
5411 * We don't want the data to overlap the metadata,
5412 * Internal Bitmap issues have been handled elsewhere.
5414 if (rdev
->meta_bdev
) {
5415 /* Nothing to check */;
5416 } else if (rdev
->data_offset
< rdev
->sb_start
) {
5417 if (mddev
->dev_sectors
&&
5418 rdev
->data_offset
+ mddev
->dev_sectors
5420 pr_warn("md: %s: data overlaps metadata\n",
5425 if (rdev
->sb_start
+ rdev
->sb_size
/512
5426 > rdev
->data_offset
) {
5427 pr_warn("md: %s: metadata overlaps data\n",
5432 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
5435 if (mddev
->bio_set
== NULL
) {
5436 mddev
->bio_set
= bioset_create(BIO_POOL_SIZE
, 0);
5437 if (!mddev
->bio_set
)
5441 spin_lock(&pers_lock
);
5442 pers
= find_pers(mddev
->level
, mddev
->clevel
);
5443 if (!pers
|| !try_module_get(pers
->owner
)) {
5444 spin_unlock(&pers_lock
);
5445 if (mddev
->level
!= LEVEL_NONE
)
5446 pr_warn("md: personality for level %d is not loaded!\n",
5449 pr_warn("md: personality for level %s is not loaded!\n",
5453 spin_unlock(&pers_lock
);
5454 if (mddev
->level
!= pers
->level
) {
5455 mddev
->level
= pers
->level
;
5456 mddev
->new_level
= pers
->level
;
5458 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
5460 if (mddev
->reshape_position
!= MaxSector
&&
5461 pers
->start_reshape
== NULL
) {
5462 /* This personality cannot handle reshaping... */
5463 module_put(pers
->owner
);
5467 if (pers
->sync_request
) {
5468 /* Warn if this is a potentially silly
5471 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
5472 struct md_rdev
*rdev2
;
5475 rdev_for_each(rdev
, mddev
)
5476 rdev_for_each(rdev2
, mddev
) {
5478 rdev
->bdev
->bd_contains
==
5479 rdev2
->bdev
->bd_contains
) {
5480 pr_warn("%s: WARNING: %s appears to be on the same physical disk as %s.\n",
5482 bdevname(rdev
->bdev
,b
),
5483 bdevname(rdev2
->bdev
,b2
));
5489 pr_warn("True protection against single-disk failure might be compromised.\n");
5492 mddev
->recovery
= 0;
5493 /* may be over-ridden by personality */
5494 mddev
->resync_max_sectors
= mddev
->dev_sectors
;
5496 mddev
->ok_start_degraded
= start_dirty_degraded
;
5498 if (start_readonly
&& mddev
->ro
== 0)
5499 mddev
->ro
= 2; /* read-only, but switch on first write */
5502 * NOTE: some pers->run(), for example r5l_recovery_log(), wakes
5503 * up mddev->thread. It is important to initialize critical
5504 * resources for mddev->thread BEFORE calling pers->run().
5506 err
= pers
->run(mddev
);
5508 pr_warn("md: pers->run() failed ...\n");
5509 else if (pers
->size(mddev
, 0, 0) < mddev
->array_sectors
) {
5510 WARN_ONCE(!mddev
->external_size
,
5511 "%s: default size too small, but 'external_size' not in effect?\n",
5513 pr_warn("md: invalid array_size %llu > default size %llu\n",
5514 (unsigned long long)mddev
->array_sectors
/ 2,
5515 (unsigned long long)pers
->size(mddev
, 0, 0) / 2);
5518 if (err
== 0 && pers
->sync_request
&&
5519 (mddev
->bitmap_info
.file
|| mddev
->bitmap_info
.offset
)) {
5520 struct bitmap
*bitmap
;
5522 bitmap
= bitmap_create(mddev
, -1);
5523 if (IS_ERR(bitmap
)) {
5524 err
= PTR_ERR(bitmap
);
5525 pr_warn("%s: failed to create bitmap (%d)\n",
5526 mdname(mddev
), err
);
5528 mddev
->bitmap
= bitmap
;
5532 mddev_detach(mddev
);
5534 pers
->free(mddev
, mddev
->private);
5535 mddev
->private = NULL
;
5536 module_put(pers
->owner
);
5537 bitmap_destroy(mddev
);
5543 rdev_for_each(rdev
, mddev
) {
5544 if (rdev
->raid_disk
>= 0 &&
5545 !blk_queue_nonrot(bdev_get_queue(rdev
->bdev
))) {
5550 if (mddev
->degraded
)
5553 queue_flag_set_unlocked(QUEUE_FLAG_NONROT
, mddev
->queue
);
5555 queue_flag_clear_unlocked(QUEUE_FLAG_NONROT
, mddev
->queue
);
5556 mddev
->queue
->backing_dev_info
->congested_data
= mddev
;
5557 mddev
->queue
->backing_dev_info
->congested_fn
= md_congested
;
5559 if (pers
->sync_request
) {
5560 if (mddev
->kobj
.sd
&&
5561 sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
5562 pr_warn("md: cannot register extra attributes for %s\n",
5564 mddev
->sysfs_action
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "sync_action");
5565 } else if (mddev
->ro
== 2) /* auto-readonly not meaningful */
5568 atomic_set(&mddev
->max_corr_read_errors
,
5569 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS
);
5570 mddev
->safemode
= 0;
5571 if (mddev_is_clustered(mddev
))
5572 mddev
->safemode_delay
= 0;
5574 mddev
->safemode_delay
= (200 * HZ
)/1000 +1; /* 200 msec delay */
5577 spin_lock(&mddev
->lock
);
5579 spin_unlock(&mddev
->lock
);
5580 rdev_for_each(rdev
, mddev
)
5581 if (rdev
->raid_disk
>= 0)
5582 if (sysfs_link_rdev(mddev
, rdev
))
5583 /* failure here is OK */;
5585 if (mddev
->degraded
&& !mddev
->ro
)
5586 /* This ensures that recovering status is reported immediately
5587 * via sysfs - until a lack of spares is confirmed.
5589 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
5590 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5592 if (mddev
->sb_flags
)
5593 md_update_sb(mddev
, 0);
5595 md_new_event(mddev
);
5596 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5597 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
5598 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
5601 EXPORT_SYMBOL_GPL(md_run
);
5603 static int do_md_run(struct mddev
*mddev
)
5607 err
= md_run(mddev
);
5610 err
= bitmap_load(mddev
);
5612 bitmap_destroy(mddev
);
5616 if (mddev_is_clustered(mddev
))
5617 md_allow_write(mddev
);
5619 md_wakeup_thread(mddev
->thread
);
5620 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
5622 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
5623 revalidate_disk(mddev
->gendisk
);
5625 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
5630 static int restart_array(struct mddev
*mddev
)
5632 struct gendisk
*disk
= mddev
->gendisk
;
5633 struct md_rdev
*rdev
;
5634 bool has_journal
= false;
5635 bool has_readonly
= false;
5637 /* Complain if it has no devices */
5638 if (list_empty(&mddev
->disks
))
5646 rdev_for_each_rcu(rdev
, mddev
) {
5647 if (test_bit(Journal
, &rdev
->flags
) &&
5648 !test_bit(Faulty
, &rdev
->flags
))
5650 if (bdev_read_only(rdev
->bdev
))
5651 has_readonly
= true;
5654 if (test_bit(MD_HAS_JOURNAL
, &mddev
->flags
) && !has_journal
)
5655 /* Don't restart rw with journal missing/faulty */
5660 mddev
->safemode
= 0;
5662 set_disk_ro(disk
, 0);
5663 pr_debug("md: %s switched to read-write mode.\n", mdname(mddev
));
5664 /* Kick recovery or resync if necessary */
5665 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5666 md_wakeup_thread(mddev
->thread
);
5667 md_wakeup_thread(mddev
->sync_thread
);
5668 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5672 static void md_clean(struct mddev
*mddev
)
5674 mddev
->array_sectors
= 0;
5675 mddev
->external_size
= 0;
5676 mddev
->dev_sectors
= 0;
5677 mddev
->raid_disks
= 0;
5678 mddev
->recovery_cp
= 0;
5679 mddev
->resync_min
= 0;
5680 mddev
->resync_max
= MaxSector
;
5681 mddev
->reshape_position
= MaxSector
;
5682 mddev
->external
= 0;
5683 mddev
->persistent
= 0;
5684 mddev
->level
= LEVEL_NONE
;
5685 mddev
->clevel
[0] = 0;
5687 mddev
->sb_flags
= 0;
5689 mddev
->metadata_type
[0] = 0;
5690 mddev
->chunk_sectors
= 0;
5691 mddev
->ctime
= mddev
->utime
= 0;
5693 mddev
->max_disks
= 0;
5695 mddev
->can_decrease_events
= 0;
5696 mddev
->delta_disks
= 0;
5697 mddev
->reshape_backwards
= 0;
5698 mddev
->new_level
= LEVEL_NONE
;
5699 mddev
->new_layout
= 0;
5700 mddev
->new_chunk_sectors
= 0;
5701 mddev
->curr_resync
= 0;
5702 atomic64_set(&mddev
->resync_mismatches
, 0);
5703 mddev
->suspend_lo
= mddev
->suspend_hi
= 0;
5704 mddev
->sync_speed_min
= mddev
->sync_speed_max
= 0;
5705 mddev
->recovery
= 0;
5708 mddev
->degraded
= 0;
5709 mddev
->safemode
= 0;
5710 mddev
->private = NULL
;
5711 mddev
->cluster_info
= NULL
;
5712 mddev
->bitmap_info
.offset
= 0;
5713 mddev
->bitmap_info
.default_offset
= 0;
5714 mddev
->bitmap_info
.default_space
= 0;
5715 mddev
->bitmap_info
.chunksize
= 0;
5716 mddev
->bitmap_info
.daemon_sleep
= 0;
5717 mddev
->bitmap_info
.max_write_behind
= 0;
5718 mddev
->bitmap_info
.nodes
= 0;
5721 static void __md_stop_writes(struct mddev
*mddev
)
5723 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5724 flush_workqueue(md_misc_wq
);
5725 if (mddev
->sync_thread
) {
5726 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5727 md_reap_sync_thread(mddev
);
5730 del_timer_sync(&mddev
->safemode_timer
);
5732 if (mddev
->pers
&& mddev
->pers
->quiesce
) {
5733 mddev
->pers
->quiesce(mddev
, 1);
5734 mddev
->pers
->quiesce(mddev
, 0);
5736 bitmap_flush(mddev
);
5738 if (mddev
->ro
== 0 &&
5739 ((!mddev
->in_sync
&& !mddev_is_clustered(mddev
)) ||
5741 /* mark array as shutdown cleanly */
5742 if (!mddev_is_clustered(mddev
))
5744 md_update_sb(mddev
, 1);
5748 void md_stop_writes(struct mddev
*mddev
)
5750 mddev_lock_nointr(mddev
);
5751 __md_stop_writes(mddev
);
5752 mddev_unlock(mddev
);
5754 EXPORT_SYMBOL_GPL(md_stop_writes
);
5756 static void mddev_detach(struct mddev
*mddev
)
5758 bitmap_wait_behind_writes(mddev
);
5759 if (mddev
->pers
&& mddev
->pers
->quiesce
) {
5760 mddev
->pers
->quiesce(mddev
, 1);
5761 mddev
->pers
->quiesce(mddev
, 0);
5763 md_unregister_thread(&mddev
->thread
);
5765 blk_sync_queue(mddev
->queue
); /* the unplug fn references 'conf'*/
5768 static void __md_stop(struct mddev
*mddev
)
5770 struct md_personality
*pers
= mddev
->pers
;
5771 bitmap_destroy(mddev
);
5772 mddev_detach(mddev
);
5773 /* Ensure ->event_work is done */
5774 flush_workqueue(md_misc_wq
);
5775 spin_lock(&mddev
->lock
);
5777 spin_unlock(&mddev
->lock
);
5778 pers
->free(mddev
, mddev
->private);
5779 mddev
->private = NULL
;
5780 if (pers
->sync_request
&& mddev
->to_remove
== NULL
)
5781 mddev
->to_remove
= &md_redundancy_group
;
5782 module_put(pers
->owner
);
5783 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5786 void md_stop(struct mddev
*mddev
)
5788 /* stop the array and free an attached data structures.
5789 * This is called from dm-raid
5793 bioset_free(mddev
->bio_set
);
5796 EXPORT_SYMBOL_GPL(md_stop
);
5798 static int md_set_readonly(struct mddev
*mddev
, struct block_device
*bdev
)
5803 if (!test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
)) {
5805 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5806 md_wakeup_thread(mddev
->thread
);
5808 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
5809 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5810 if (mddev
->sync_thread
)
5811 /* Thread might be blocked waiting for metadata update
5812 * which will now never happen */
5813 wake_up_process(mddev
->sync_thread
->tsk
);
5815 if (mddev
->external
&& test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
))
5817 mddev_unlock(mddev
);
5818 wait_event(resync_wait
, !test_bit(MD_RECOVERY_RUNNING
,
5820 wait_event(mddev
->sb_wait
,
5821 !test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
));
5822 mddev_lock_nointr(mddev
);
5824 mutex_lock(&mddev
->open_mutex
);
5825 if ((mddev
->pers
&& atomic_read(&mddev
->openers
) > !!bdev
) ||
5826 mddev
->sync_thread
||
5827 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
)) {
5828 pr_warn("md: %s still in use.\n",mdname(mddev
));
5830 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5831 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5832 md_wakeup_thread(mddev
->thread
);
5838 __md_stop_writes(mddev
);
5844 set_disk_ro(mddev
->gendisk
, 1);
5845 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5846 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5847 md_wakeup_thread(mddev
->thread
);
5848 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5852 mutex_unlock(&mddev
->open_mutex
);
5857 * 0 - completely stop and dis-assemble array
5858 * 2 - stop but do not disassemble array
5860 static int do_md_stop(struct mddev
*mddev
, int mode
,
5861 struct block_device
*bdev
)
5863 struct gendisk
*disk
= mddev
->gendisk
;
5864 struct md_rdev
*rdev
;
5867 if (!test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
)) {
5869 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5870 md_wakeup_thread(mddev
->thread
);
5872 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
5873 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5874 if (mddev
->sync_thread
)
5875 /* Thread might be blocked waiting for metadata update
5876 * which will now never happen */
5877 wake_up_process(mddev
->sync_thread
->tsk
);
5879 mddev_unlock(mddev
);
5880 wait_event(resync_wait
, (mddev
->sync_thread
== NULL
&&
5881 !test_bit(MD_RECOVERY_RUNNING
,
5882 &mddev
->recovery
)));
5883 mddev_lock_nointr(mddev
);
5885 mutex_lock(&mddev
->open_mutex
);
5886 if ((mddev
->pers
&& atomic_read(&mddev
->openers
) > !!bdev
) ||
5887 mddev
->sysfs_active
||
5888 mddev
->sync_thread
||
5889 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
)) {
5890 pr_warn("md: %s still in use.\n",mdname(mddev
));
5891 mutex_unlock(&mddev
->open_mutex
);
5893 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5894 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5895 md_wakeup_thread(mddev
->thread
);
5901 set_disk_ro(disk
, 0);
5903 __md_stop_writes(mddev
);
5905 mddev
->queue
->backing_dev_info
->congested_fn
= NULL
;
5907 /* tell userspace to handle 'inactive' */
5908 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5910 rdev_for_each(rdev
, mddev
)
5911 if (rdev
->raid_disk
>= 0)
5912 sysfs_unlink_rdev(mddev
, rdev
);
5914 set_capacity(disk
, 0);
5915 mutex_unlock(&mddev
->open_mutex
);
5917 revalidate_disk(disk
);
5922 mutex_unlock(&mddev
->open_mutex
);
5924 * Free resources if final stop
5927 pr_info("md: %s stopped.\n", mdname(mddev
));
5929 if (mddev
->bitmap_info
.file
) {
5930 struct file
*f
= mddev
->bitmap_info
.file
;
5931 spin_lock(&mddev
->lock
);
5932 mddev
->bitmap_info
.file
= NULL
;
5933 spin_unlock(&mddev
->lock
);
5936 mddev
->bitmap_info
.offset
= 0;
5938 export_array(mddev
);
5941 if (mddev
->hold_active
== UNTIL_STOP
)
5942 mddev
->hold_active
= 0;
5944 md_new_event(mddev
);
5945 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5950 static void autorun_array(struct mddev
*mddev
)
5952 struct md_rdev
*rdev
;
5955 if (list_empty(&mddev
->disks
))
5958 pr_info("md: running: ");
5960 rdev_for_each(rdev
, mddev
) {
5961 char b
[BDEVNAME_SIZE
];
5962 pr_cont("<%s>", bdevname(rdev
->bdev
,b
));
5966 err
= do_md_run(mddev
);
5968 pr_warn("md: do_md_run() returned %d\n", err
);
5969 do_md_stop(mddev
, 0, NULL
);
5974 * lets try to run arrays based on all disks that have arrived
5975 * until now. (those are in pending_raid_disks)
5977 * the method: pick the first pending disk, collect all disks with
5978 * the same UUID, remove all from the pending list and put them into
5979 * the 'same_array' list. Then order this list based on superblock
5980 * update time (freshest comes first), kick out 'old' disks and
5981 * compare superblocks. If everything's fine then run it.
5983 * If "unit" is allocated, then bump its reference count
5985 static void autorun_devices(int part
)
5987 struct md_rdev
*rdev0
, *rdev
, *tmp
;
5988 struct mddev
*mddev
;
5989 char b
[BDEVNAME_SIZE
];
5991 pr_info("md: autorun ...\n");
5992 while (!list_empty(&pending_raid_disks
)) {
5995 LIST_HEAD(candidates
);
5996 rdev0
= list_entry(pending_raid_disks
.next
,
5997 struct md_rdev
, same_set
);
5999 pr_debug("md: considering %s ...\n", bdevname(rdev0
->bdev
,b
));
6000 INIT_LIST_HEAD(&candidates
);
6001 rdev_for_each_list(rdev
, tmp
, &pending_raid_disks
)
6002 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
6003 pr_debug("md: adding %s ...\n",
6004 bdevname(rdev
->bdev
,b
));
6005 list_move(&rdev
->same_set
, &candidates
);
6008 * now we have a set of devices, with all of them having
6009 * mostly sane superblocks. It's time to allocate the
6013 dev
= MKDEV(mdp_major
,
6014 rdev0
->preferred_minor
<< MdpMinorShift
);
6015 unit
= MINOR(dev
) >> MdpMinorShift
;
6017 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
6020 if (rdev0
->preferred_minor
!= unit
) {
6021 pr_warn("md: unit number in %s is bad: %d\n",
6022 bdevname(rdev0
->bdev
, b
), rdev0
->preferred_minor
);
6026 md_probe(dev
, NULL
, NULL
);
6027 mddev
= mddev_find(dev
);
6028 if (!mddev
|| !mddev
->gendisk
) {
6033 if (mddev_lock(mddev
))
6034 pr_warn("md: %s locked, cannot run\n", mdname(mddev
));
6035 else if (mddev
->raid_disks
|| mddev
->major_version
6036 || !list_empty(&mddev
->disks
)) {
6037 pr_warn("md: %s already running, cannot run %s\n",
6038 mdname(mddev
), bdevname(rdev0
->bdev
,b
));
6039 mddev_unlock(mddev
);
6041 pr_debug("md: created %s\n", mdname(mddev
));
6042 mddev
->persistent
= 1;
6043 rdev_for_each_list(rdev
, tmp
, &candidates
) {
6044 list_del_init(&rdev
->same_set
);
6045 if (bind_rdev_to_array(rdev
, mddev
))
6048 autorun_array(mddev
);
6049 mddev_unlock(mddev
);
6051 /* on success, candidates will be empty, on error
6054 rdev_for_each_list(rdev
, tmp
, &candidates
) {
6055 list_del_init(&rdev
->same_set
);
6060 pr_info("md: ... autorun DONE.\n");
6062 #endif /* !MODULE */
6064 static int get_version(void __user
*arg
)
6068 ver
.major
= MD_MAJOR_VERSION
;
6069 ver
.minor
= MD_MINOR_VERSION
;
6070 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
6072 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
6078 static int get_array_info(struct mddev
*mddev
, void __user
*arg
)
6080 mdu_array_info_t info
;
6081 int nr
,working
,insync
,failed
,spare
;
6082 struct md_rdev
*rdev
;
6084 nr
= working
= insync
= failed
= spare
= 0;
6086 rdev_for_each_rcu(rdev
, mddev
) {
6088 if (test_bit(Faulty
, &rdev
->flags
))
6092 if (test_bit(In_sync
, &rdev
->flags
))
6094 else if (test_bit(Journal
, &rdev
->flags
))
6095 /* TODO: add journal count to md_u.h */
6103 info
.major_version
= mddev
->major_version
;
6104 info
.minor_version
= mddev
->minor_version
;
6105 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
6106 info
.ctime
= clamp_t(time64_t
, mddev
->ctime
, 0, U32_MAX
);
6107 info
.level
= mddev
->level
;
6108 info
.size
= mddev
->dev_sectors
/ 2;
6109 if (info
.size
!= mddev
->dev_sectors
/ 2) /* overflow */
6112 info
.raid_disks
= mddev
->raid_disks
;
6113 info
.md_minor
= mddev
->md_minor
;
6114 info
.not_persistent
= !mddev
->persistent
;
6116 info
.utime
= clamp_t(time64_t
, mddev
->utime
, 0, U32_MAX
);
6119 info
.state
= (1<<MD_SB_CLEAN
);
6120 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
6121 info
.state
|= (1<<MD_SB_BITMAP_PRESENT
);
6122 if (mddev_is_clustered(mddev
))
6123 info
.state
|= (1<<MD_SB_CLUSTERED
);
6124 info
.active_disks
= insync
;
6125 info
.working_disks
= working
;
6126 info
.failed_disks
= failed
;
6127 info
.spare_disks
= spare
;
6129 info
.layout
= mddev
->layout
;
6130 info
.chunk_size
= mddev
->chunk_sectors
<< 9;
6132 if (copy_to_user(arg
, &info
, sizeof(info
)))
6138 static int get_bitmap_file(struct mddev
*mddev
, void __user
* arg
)
6140 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
6144 file
= kzalloc(sizeof(*file
), GFP_NOIO
);
6149 spin_lock(&mddev
->lock
);
6150 /* bitmap enabled */
6151 if (mddev
->bitmap_info
.file
) {
6152 ptr
= file_path(mddev
->bitmap_info
.file
, file
->pathname
,
6153 sizeof(file
->pathname
));
6157 memmove(file
->pathname
, ptr
,
6158 sizeof(file
->pathname
)-(ptr
-file
->pathname
));
6160 spin_unlock(&mddev
->lock
);
6163 copy_to_user(arg
, file
, sizeof(*file
)))
6170 static int get_disk_info(struct mddev
*mddev
, void __user
* arg
)
6172 mdu_disk_info_t info
;
6173 struct md_rdev
*rdev
;
6175 if (copy_from_user(&info
, arg
, sizeof(info
)))
6179 rdev
= md_find_rdev_nr_rcu(mddev
, info
.number
);
6181 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
6182 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
6183 info
.raid_disk
= rdev
->raid_disk
;
6185 if (test_bit(Faulty
, &rdev
->flags
))
6186 info
.state
|= (1<<MD_DISK_FAULTY
);
6187 else if (test_bit(In_sync
, &rdev
->flags
)) {
6188 info
.state
|= (1<<MD_DISK_ACTIVE
);
6189 info
.state
|= (1<<MD_DISK_SYNC
);
6191 if (test_bit(Journal
, &rdev
->flags
))
6192 info
.state
|= (1<<MD_DISK_JOURNAL
);
6193 if (test_bit(WriteMostly
, &rdev
->flags
))
6194 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
6195 if (test_bit(FailFast
, &rdev
->flags
))
6196 info
.state
|= (1<<MD_DISK_FAILFAST
);
6198 info
.major
= info
.minor
= 0;
6199 info
.raid_disk
= -1;
6200 info
.state
= (1<<MD_DISK_REMOVED
);
6204 if (copy_to_user(arg
, &info
, sizeof(info
)))
6210 static int add_new_disk(struct mddev
*mddev
, mdu_disk_info_t
*info
)
6212 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
6213 struct md_rdev
*rdev
;
6214 dev_t dev
= MKDEV(info
->major
,info
->minor
);
6216 if (mddev_is_clustered(mddev
) &&
6217 !(info
->state
& ((1 << MD_DISK_CLUSTER_ADD
) | (1 << MD_DISK_CANDIDATE
)))) {
6218 pr_warn("%s: Cannot add to clustered mddev.\n",
6223 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
6226 if (!mddev
->raid_disks
) {
6228 /* expecting a device which has a superblock */
6229 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
6231 pr_warn("md: md_import_device returned %ld\n",
6233 return PTR_ERR(rdev
);
6235 if (!list_empty(&mddev
->disks
)) {
6236 struct md_rdev
*rdev0
6237 = list_entry(mddev
->disks
.next
,
6238 struct md_rdev
, same_set
);
6239 err
= super_types
[mddev
->major_version
]
6240 .load_super(rdev
, rdev0
, mddev
->minor_version
);
6242 pr_warn("md: %s has different UUID to %s\n",
6243 bdevname(rdev
->bdev
,b
),
6244 bdevname(rdev0
->bdev
,b2
));
6249 err
= bind_rdev_to_array(rdev
, mddev
);
6256 * add_new_disk can be used once the array is assembled
6257 * to add "hot spares". They must already have a superblock
6262 if (!mddev
->pers
->hot_add_disk
) {
6263 pr_warn("%s: personality does not support diskops!\n",
6267 if (mddev
->persistent
)
6268 rdev
= md_import_device(dev
, mddev
->major_version
,
6269 mddev
->minor_version
);
6271 rdev
= md_import_device(dev
, -1, -1);
6273 pr_warn("md: md_import_device returned %ld\n",
6275 return PTR_ERR(rdev
);
6277 /* set saved_raid_disk if appropriate */
6278 if (!mddev
->persistent
) {
6279 if (info
->state
& (1<<MD_DISK_SYNC
) &&
6280 info
->raid_disk
< mddev
->raid_disks
) {
6281 rdev
->raid_disk
= info
->raid_disk
;
6282 set_bit(In_sync
, &rdev
->flags
);
6283 clear_bit(Bitmap_sync
, &rdev
->flags
);
6285 rdev
->raid_disk
= -1;
6286 rdev
->saved_raid_disk
= rdev
->raid_disk
;
6288 super_types
[mddev
->major_version
].
6289 validate_super(mddev
, rdev
);
6290 if ((info
->state
& (1<<MD_DISK_SYNC
)) &&
6291 rdev
->raid_disk
!= info
->raid_disk
) {
6292 /* This was a hot-add request, but events doesn't
6293 * match, so reject it.
6299 clear_bit(In_sync
, &rdev
->flags
); /* just to be sure */
6300 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
6301 set_bit(WriteMostly
, &rdev
->flags
);
6303 clear_bit(WriteMostly
, &rdev
->flags
);
6304 if (info
->state
& (1<<MD_DISK_FAILFAST
))
6305 set_bit(FailFast
, &rdev
->flags
);
6307 clear_bit(FailFast
, &rdev
->flags
);
6309 if (info
->state
& (1<<MD_DISK_JOURNAL
)) {
6310 struct md_rdev
*rdev2
;
6311 bool has_journal
= false;
6313 /* make sure no existing journal disk */
6314 rdev_for_each(rdev2
, mddev
) {
6315 if (test_bit(Journal
, &rdev2
->flags
)) {
6324 set_bit(Journal
, &rdev
->flags
);
6327 * check whether the device shows up in other nodes
6329 if (mddev_is_clustered(mddev
)) {
6330 if (info
->state
& (1 << MD_DISK_CANDIDATE
))
6331 set_bit(Candidate
, &rdev
->flags
);
6332 else if (info
->state
& (1 << MD_DISK_CLUSTER_ADD
)) {
6333 /* --add initiated by this node */
6334 err
= md_cluster_ops
->add_new_disk(mddev
, rdev
);
6342 rdev
->raid_disk
= -1;
6343 err
= bind_rdev_to_array(rdev
, mddev
);
6348 if (mddev_is_clustered(mddev
)) {
6349 if (info
->state
& (1 << MD_DISK_CANDIDATE
)) {
6351 err
= md_cluster_ops
->new_disk_ack(mddev
,
6354 md_kick_rdev_from_array(rdev
);
6358 md_cluster_ops
->add_new_disk_cancel(mddev
);
6360 err
= add_bound_rdev(rdev
);
6364 err
= add_bound_rdev(rdev
);
6369 /* otherwise, add_new_disk is only allowed
6370 * for major_version==0 superblocks
6372 if (mddev
->major_version
!= 0) {
6373 pr_warn("%s: ADD_NEW_DISK not supported\n", mdname(mddev
));
6377 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
6379 rdev
= md_import_device(dev
, -1, 0);
6381 pr_warn("md: error, md_import_device() returned %ld\n",
6383 return PTR_ERR(rdev
);
6385 rdev
->desc_nr
= info
->number
;
6386 if (info
->raid_disk
< mddev
->raid_disks
)
6387 rdev
->raid_disk
= info
->raid_disk
;
6389 rdev
->raid_disk
= -1;
6391 if (rdev
->raid_disk
< mddev
->raid_disks
)
6392 if (info
->state
& (1<<MD_DISK_SYNC
))
6393 set_bit(In_sync
, &rdev
->flags
);
6395 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
6396 set_bit(WriteMostly
, &rdev
->flags
);
6397 if (info
->state
& (1<<MD_DISK_FAILFAST
))
6398 set_bit(FailFast
, &rdev
->flags
);
6400 if (!mddev
->persistent
) {
6401 pr_debug("md: nonpersistent superblock ...\n");
6402 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
6404 rdev
->sb_start
= calc_dev_sboffset(rdev
);
6405 rdev
->sectors
= rdev
->sb_start
;
6407 err
= bind_rdev_to_array(rdev
, mddev
);
6417 static int hot_remove_disk(struct mddev
*mddev
, dev_t dev
)
6419 char b
[BDEVNAME_SIZE
];
6420 struct md_rdev
*rdev
;
6422 rdev
= find_rdev(mddev
, dev
);
6426 if (rdev
->raid_disk
< 0)
6429 clear_bit(Blocked
, &rdev
->flags
);
6430 remove_and_add_spares(mddev
, rdev
);
6432 if (rdev
->raid_disk
>= 0)
6436 if (mddev_is_clustered(mddev
))
6437 md_cluster_ops
->remove_disk(mddev
, rdev
);
6439 md_kick_rdev_from_array(rdev
);
6440 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
6442 md_wakeup_thread(mddev
->thread
);
6444 md_update_sb(mddev
, 1);
6445 md_new_event(mddev
);
6449 pr_debug("md: cannot remove active disk %s from %s ...\n",
6450 bdevname(rdev
->bdev
,b
), mdname(mddev
));
6454 static int hot_add_disk(struct mddev
*mddev
, dev_t dev
)
6456 char b
[BDEVNAME_SIZE
];
6458 struct md_rdev
*rdev
;
6463 if (mddev
->major_version
!= 0) {
6464 pr_warn("%s: HOT_ADD may only be used with version-0 superblocks.\n",
6468 if (!mddev
->pers
->hot_add_disk
) {
6469 pr_warn("%s: personality does not support diskops!\n",
6474 rdev
= md_import_device(dev
, -1, 0);
6476 pr_warn("md: error, md_import_device() returned %ld\n",
6481 if (mddev
->persistent
)
6482 rdev
->sb_start
= calc_dev_sboffset(rdev
);
6484 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
6486 rdev
->sectors
= rdev
->sb_start
;
6488 if (test_bit(Faulty
, &rdev
->flags
)) {
6489 pr_warn("md: can not hot-add faulty %s disk to %s!\n",
6490 bdevname(rdev
->bdev
,b
), mdname(mddev
));
6495 clear_bit(In_sync
, &rdev
->flags
);
6497 rdev
->saved_raid_disk
= -1;
6498 err
= bind_rdev_to_array(rdev
, mddev
);
6503 * The rest should better be atomic, we can have disk failures
6504 * noticed in interrupt contexts ...
6507 rdev
->raid_disk
= -1;
6509 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
6511 md_update_sb(mddev
, 1);
6513 * Kick recovery, maybe this spare has to be added to the
6514 * array immediately.
6516 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6517 md_wakeup_thread(mddev
->thread
);
6518 md_new_event(mddev
);
6526 static int set_bitmap_file(struct mddev
*mddev
, int fd
)
6531 if (!mddev
->pers
->quiesce
|| !mddev
->thread
)
6533 if (mddev
->recovery
|| mddev
->sync_thread
)
6535 /* we should be able to change the bitmap.. */
6539 struct inode
*inode
;
6542 if (mddev
->bitmap
|| mddev
->bitmap_info
.file
)
6543 return -EEXIST
; /* cannot add when bitmap is present */
6547 pr_warn("%s: error: failed to get bitmap file\n",
6552 inode
= f
->f_mapping
->host
;
6553 if (!S_ISREG(inode
->i_mode
)) {
6554 pr_warn("%s: error: bitmap file must be a regular file\n",
6557 } else if (!(f
->f_mode
& FMODE_WRITE
)) {
6558 pr_warn("%s: error: bitmap file must open for write\n",
6561 } else if (atomic_read(&inode
->i_writecount
) != 1) {
6562 pr_warn("%s: error: bitmap file is already in use\n",
6570 mddev
->bitmap_info
.file
= f
;
6571 mddev
->bitmap_info
.offset
= 0; /* file overrides offset */
6572 } else if (mddev
->bitmap
== NULL
)
6573 return -ENOENT
; /* cannot remove what isn't there */
6576 mddev
->pers
->quiesce(mddev
, 1);
6578 struct bitmap
*bitmap
;
6580 bitmap
= bitmap_create(mddev
, -1);
6581 if (!IS_ERR(bitmap
)) {
6582 mddev
->bitmap
= bitmap
;
6583 err
= bitmap_load(mddev
);
6585 err
= PTR_ERR(bitmap
);
6587 if (fd
< 0 || err
) {
6588 bitmap_destroy(mddev
);
6589 fd
= -1; /* make sure to put the file */
6591 mddev
->pers
->quiesce(mddev
, 0);
6594 struct file
*f
= mddev
->bitmap_info
.file
;
6596 spin_lock(&mddev
->lock
);
6597 mddev
->bitmap_info
.file
= NULL
;
6598 spin_unlock(&mddev
->lock
);
6607 * set_array_info is used two different ways
6608 * The original usage is when creating a new array.
6609 * In this usage, raid_disks is > 0 and it together with
6610 * level, size, not_persistent,layout,chunksize determine the
6611 * shape of the array.
6612 * This will always create an array with a type-0.90.0 superblock.
6613 * The newer usage is when assembling an array.
6614 * In this case raid_disks will be 0, and the major_version field is
6615 * use to determine which style super-blocks are to be found on the devices.
6616 * The minor and patch _version numbers are also kept incase the
6617 * super_block handler wishes to interpret them.
6619 static int set_array_info(struct mddev
*mddev
, mdu_array_info_t
*info
)
6622 if (info
->raid_disks
== 0) {
6623 /* just setting version number for superblock loading */
6624 if (info
->major_version
< 0 ||
6625 info
->major_version
>= ARRAY_SIZE(super_types
) ||
6626 super_types
[info
->major_version
].name
== NULL
) {
6627 /* maybe try to auto-load a module? */
6628 pr_warn("md: superblock version %d not known\n",
6629 info
->major_version
);
6632 mddev
->major_version
= info
->major_version
;
6633 mddev
->minor_version
= info
->minor_version
;
6634 mddev
->patch_version
= info
->patch_version
;
6635 mddev
->persistent
= !info
->not_persistent
;
6636 /* ensure mddev_put doesn't delete this now that there
6637 * is some minimal configuration.
6639 mddev
->ctime
= ktime_get_real_seconds();
6642 mddev
->major_version
= MD_MAJOR_VERSION
;
6643 mddev
->minor_version
= MD_MINOR_VERSION
;
6644 mddev
->patch_version
= MD_PATCHLEVEL_VERSION
;
6645 mddev
->ctime
= ktime_get_real_seconds();
6647 mddev
->level
= info
->level
;
6648 mddev
->clevel
[0] = 0;
6649 mddev
->dev_sectors
= 2 * (sector_t
)info
->size
;
6650 mddev
->raid_disks
= info
->raid_disks
;
6651 /* don't set md_minor, it is determined by which /dev/md* was
6654 if (info
->state
& (1<<MD_SB_CLEAN
))
6655 mddev
->recovery_cp
= MaxSector
;
6657 mddev
->recovery_cp
= 0;
6658 mddev
->persistent
= ! info
->not_persistent
;
6659 mddev
->external
= 0;
6661 mddev
->layout
= info
->layout
;
6662 mddev
->chunk_sectors
= info
->chunk_size
>> 9;
6664 if (mddev
->persistent
) {
6665 mddev
->max_disks
= MD_SB_DISKS
;
6667 mddev
->sb_flags
= 0;
6669 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
6671 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
6672 mddev
->bitmap_info
.default_space
= 64*2 - (MD_SB_BYTES
>> 9);
6673 mddev
->bitmap_info
.offset
= 0;
6675 mddev
->reshape_position
= MaxSector
;
6678 * Generate a 128 bit UUID
6680 get_random_bytes(mddev
->uuid
, 16);
6682 mddev
->new_level
= mddev
->level
;
6683 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
6684 mddev
->new_layout
= mddev
->layout
;
6685 mddev
->delta_disks
= 0;
6686 mddev
->reshape_backwards
= 0;
6691 void md_set_array_sectors(struct mddev
*mddev
, sector_t array_sectors
)
6693 WARN(!mddev_is_locked(mddev
), "%s: unlocked mddev!\n", __func__
);
6695 if (mddev
->external_size
)
6698 mddev
->array_sectors
= array_sectors
;
6700 EXPORT_SYMBOL(md_set_array_sectors
);
6702 static int update_size(struct mddev
*mddev
, sector_t num_sectors
)
6704 struct md_rdev
*rdev
;
6706 int fit
= (num_sectors
== 0);
6707 sector_t old_dev_sectors
= mddev
->dev_sectors
;
6709 if (mddev
->pers
->resize
== NULL
)
6711 /* The "num_sectors" is the number of sectors of each device that
6712 * is used. This can only make sense for arrays with redundancy.
6713 * linear and raid0 always use whatever space is available. We can only
6714 * consider changing this number if no resync or reconstruction is
6715 * happening, and if the new size is acceptable. It must fit before the
6716 * sb_start or, if that is <data_offset, it must fit before the size
6717 * of each device. If num_sectors is zero, we find the largest size
6720 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
6726 rdev_for_each(rdev
, mddev
) {
6727 sector_t avail
= rdev
->sectors
;
6729 if (fit
&& (num_sectors
== 0 || num_sectors
> avail
))
6730 num_sectors
= avail
;
6731 if (avail
< num_sectors
)
6734 rv
= mddev
->pers
->resize(mddev
, num_sectors
);
6736 if (mddev_is_clustered(mddev
))
6737 md_cluster_ops
->update_size(mddev
, old_dev_sectors
);
6738 else if (mddev
->queue
) {
6739 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
6740 revalidate_disk(mddev
->gendisk
);
6746 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
)
6749 struct md_rdev
*rdev
;
6750 /* change the number of raid disks */
6751 if (mddev
->pers
->check_reshape
== NULL
)
6755 if (raid_disks
<= 0 ||
6756 (mddev
->max_disks
&& raid_disks
>= mddev
->max_disks
))
6758 if (mddev
->sync_thread
||
6759 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
6760 mddev
->reshape_position
!= MaxSector
)
6763 rdev_for_each(rdev
, mddev
) {
6764 if (mddev
->raid_disks
< raid_disks
&&
6765 rdev
->data_offset
< rdev
->new_data_offset
)
6767 if (mddev
->raid_disks
> raid_disks
&&
6768 rdev
->data_offset
> rdev
->new_data_offset
)
6772 mddev
->delta_disks
= raid_disks
- mddev
->raid_disks
;
6773 if (mddev
->delta_disks
< 0)
6774 mddev
->reshape_backwards
= 1;
6775 else if (mddev
->delta_disks
> 0)
6776 mddev
->reshape_backwards
= 0;
6778 rv
= mddev
->pers
->check_reshape(mddev
);
6780 mddev
->delta_disks
= 0;
6781 mddev
->reshape_backwards
= 0;
6787 * update_array_info is used to change the configuration of an
6789 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
6790 * fields in the info are checked against the array.
6791 * Any differences that cannot be handled will cause an error.
6792 * Normally, only one change can be managed at a time.
6794 static int update_array_info(struct mddev
*mddev
, mdu_array_info_t
*info
)
6800 /* calculate expected state,ignoring low bits */
6801 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
6802 state
|= (1 << MD_SB_BITMAP_PRESENT
);
6804 if (mddev
->major_version
!= info
->major_version
||
6805 mddev
->minor_version
!= info
->minor_version
||
6806 /* mddev->patch_version != info->patch_version || */
6807 mddev
->ctime
!= info
->ctime
||
6808 mddev
->level
!= info
->level
||
6809 /* mddev->layout != info->layout || */
6810 mddev
->persistent
!= !info
->not_persistent
||
6811 mddev
->chunk_sectors
!= info
->chunk_size
>> 9 ||
6812 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
6813 ((state
^info
->state
) & 0xfffffe00)
6816 /* Check there is only one change */
6817 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
6819 if (mddev
->raid_disks
!= info
->raid_disks
)
6821 if (mddev
->layout
!= info
->layout
)
6823 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
))
6830 if (mddev
->layout
!= info
->layout
) {
6832 * we don't need to do anything at the md level, the
6833 * personality will take care of it all.
6835 if (mddev
->pers
->check_reshape
== NULL
)
6838 mddev
->new_layout
= info
->layout
;
6839 rv
= mddev
->pers
->check_reshape(mddev
);
6841 mddev
->new_layout
= mddev
->layout
;
6845 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
6846 rv
= update_size(mddev
, (sector_t
)info
->size
* 2);
6848 if (mddev
->raid_disks
!= info
->raid_disks
)
6849 rv
= update_raid_disks(mddev
, info
->raid_disks
);
6851 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) {
6852 if (mddev
->pers
->quiesce
== NULL
|| mddev
->thread
== NULL
) {
6856 if (mddev
->recovery
|| mddev
->sync_thread
) {
6860 if (info
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
6861 struct bitmap
*bitmap
;
6862 /* add the bitmap */
6863 if (mddev
->bitmap
) {
6867 if (mddev
->bitmap_info
.default_offset
== 0) {
6871 mddev
->bitmap_info
.offset
=
6872 mddev
->bitmap_info
.default_offset
;
6873 mddev
->bitmap_info
.space
=
6874 mddev
->bitmap_info
.default_space
;
6875 mddev
->pers
->quiesce(mddev
, 1);
6876 bitmap
= bitmap_create(mddev
, -1);
6877 if (!IS_ERR(bitmap
)) {
6878 mddev
->bitmap
= bitmap
;
6879 rv
= bitmap_load(mddev
);
6881 rv
= PTR_ERR(bitmap
);
6883 bitmap_destroy(mddev
);
6884 mddev
->pers
->quiesce(mddev
, 0);
6886 /* remove the bitmap */
6887 if (!mddev
->bitmap
) {
6891 if (mddev
->bitmap
->storage
.file
) {
6895 if (mddev
->bitmap_info
.nodes
) {
6896 /* hold PW on all the bitmap lock */
6897 if (md_cluster_ops
->lock_all_bitmaps(mddev
) <= 0) {
6898 pr_warn("md: can't change bitmap to none since the array is in use by more than one node\n");
6900 md_cluster_ops
->unlock_all_bitmaps(mddev
);
6904 mddev
->bitmap_info
.nodes
= 0;
6905 md_cluster_ops
->leave(mddev
);
6907 mddev
->pers
->quiesce(mddev
, 1);
6908 bitmap_destroy(mddev
);
6909 mddev
->pers
->quiesce(mddev
, 0);
6910 mddev
->bitmap_info
.offset
= 0;
6913 md_update_sb(mddev
, 1);
6919 static int set_disk_faulty(struct mddev
*mddev
, dev_t dev
)
6921 struct md_rdev
*rdev
;
6924 if (mddev
->pers
== NULL
)
6928 rdev
= find_rdev_rcu(mddev
, dev
);
6932 md_error(mddev
, rdev
);
6933 if (!test_bit(Faulty
, &rdev
->flags
))
6941 * We have a problem here : there is no easy way to give a CHS
6942 * virtual geometry. We currently pretend that we have a 2 heads
6943 * 4 sectors (with a BIG number of cylinders...). This drives
6944 * dosfs just mad... ;-)
6946 static int md_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
6948 struct mddev
*mddev
= bdev
->bd_disk
->private_data
;
6952 geo
->cylinders
= mddev
->array_sectors
/ 8;
6956 static inline bool md_ioctl_valid(unsigned int cmd
)
6961 case GET_ARRAY_INFO
:
6962 case GET_BITMAP_FILE
:
6965 case HOT_REMOVE_DISK
:
6968 case RESTART_ARRAY_RW
:
6970 case SET_ARRAY_INFO
:
6971 case SET_BITMAP_FILE
:
6972 case SET_DISK_FAULTY
:
6975 case CLUSTERED_DISK_NACK
:
6982 static int md_ioctl(struct block_device
*bdev
, fmode_t mode
,
6983 unsigned int cmd
, unsigned long arg
)
6986 void __user
*argp
= (void __user
*)arg
;
6987 struct mddev
*mddev
= NULL
;
6989 bool did_set_md_closing
= false;
6991 if (!md_ioctl_valid(cmd
))
6996 case GET_ARRAY_INFO
:
7000 if (!capable(CAP_SYS_ADMIN
))
7005 * Commands dealing with the RAID driver but not any
7010 err
= get_version(argp
);
7016 autostart_arrays(arg
);
7023 * Commands creating/starting a new array:
7026 mddev
= bdev
->bd_disk
->private_data
;
7033 /* Some actions do not requires the mutex */
7035 case GET_ARRAY_INFO
:
7036 if (!mddev
->raid_disks
&& !mddev
->external
)
7039 err
= get_array_info(mddev
, argp
);
7043 if (!mddev
->raid_disks
&& !mddev
->external
)
7046 err
= get_disk_info(mddev
, argp
);
7049 case SET_DISK_FAULTY
:
7050 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
7053 case GET_BITMAP_FILE
:
7054 err
= get_bitmap_file(mddev
, argp
);
7059 if (cmd
== ADD_NEW_DISK
)
7060 /* need to ensure md_delayed_delete() has completed */
7061 flush_workqueue(md_misc_wq
);
7063 if (cmd
== HOT_REMOVE_DISK
)
7064 /* need to ensure recovery thread has run */
7065 wait_event_interruptible_timeout(mddev
->sb_wait
,
7066 !test_bit(MD_RECOVERY_NEEDED
,
7068 msecs_to_jiffies(5000));
7069 if (cmd
== STOP_ARRAY
|| cmd
== STOP_ARRAY_RO
) {
7070 /* Need to flush page cache, and ensure no-one else opens
7073 mutex_lock(&mddev
->open_mutex
);
7074 if (mddev
->pers
&& atomic_read(&mddev
->openers
) > 1) {
7075 mutex_unlock(&mddev
->open_mutex
);
7079 WARN_ON_ONCE(test_bit(MD_CLOSING
, &mddev
->flags
));
7080 set_bit(MD_CLOSING
, &mddev
->flags
);
7081 did_set_md_closing
= true;
7082 mutex_unlock(&mddev
->open_mutex
);
7083 sync_blockdev(bdev
);
7085 err
= mddev_lock(mddev
);
7087 pr_debug("md: ioctl lock interrupted, reason %d, cmd %d\n",
7092 if (cmd
== SET_ARRAY_INFO
) {
7093 mdu_array_info_t info
;
7095 memset(&info
, 0, sizeof(info
));
7096 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
7101 err
= update_array_info(mddev
, &info
);
7103 pr_warn("md: couldn't update array info. %d\n", err
);
7108 if (!list_empty(&mddev
->disks
)) {
7109 pr_warn("md: array %s already has disks!\n", mdname(mddev
));
7113 if (mddev
->raid_disks
) {
7114 pr_warn("md: array %s already initialised!\n", mdname(mddev
));
7118 err
= set_array_info(mddev
, &info
);
7120 pr_warn("md: couldn't set array info. %d\n", err
);
7127 * Commands querying/configuring an existing array:
7129 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
7130 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
7131 if ((!mddev
->raid_disks
&& !mddev
->external
)
7132 && cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
7133 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
7134 && cmd
!= GET_BITMAP_FILE
) {
7140 * Commands even a read-only array can execute:
7143 case RESTART_ARRAY_RW
:
7144 err
= restart_array(mddev
);
7148 err
= do_md_stop(mddev
, 0, bdev
);
7152 err
= md_set_readonly(mddev
, bdev
);
7155 case HOT_REMOVE_DISK
:
7156 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
7160 /* We can support ADD_NEW_DISK on read-only arrays
7161 * only if we are re-adding a preexisting device.
7162 * So require mddev->pers and MD_DISK_SYNC.
7165 mdu_disk_info_t info
;
7166 if (copy_from_user(&info
, argp
, sizeof(info
)))
7168 else if (!(info
.state
& (1<<MD_DISK_SYNC
)))
7169 /* Need to clear read-only for this */
7172 err
= add_new_disk(mddev
, &info
);
7178 if (get_user(ro
, (int __user
*)(arg
))) {
7184 /* if the bdev is going readonly the value of mddev->ro
7185 * does not matter, no writes are coming
7190 /* are we are already prepared for writes? */
7194 /* transitioning to readauto need only happen for
7195 * arrays that call md_write_start
7198 err
= restart_array(mddev
);
7201 set_disk_ro(mddev
->gendisk
, 0);
7208 * The remaining ioctls are changing the state of the
7209 * superblock, so we do not allow them on read-only arrays.
7211 if (mddev
->ro
&& mddev
->pers
) {
7212 if (mddev
->ro
== 2) {
7214 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7215 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7216 /* mddev_unlock will wake thread */
7217 /* If a device failed while we were read-only, we
7218 * need to make sure the metadata is updated now.
7220 if (test_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
)) {
7221 mddev_unlock(mddev
);
7222 wait_event(mddev
->sb_wait
,
7223 !test_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
) &&
7224 !test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
));
7225 mddev_lock_nointr(mddev
);
7236 mdu_disk_info_t info
;
7237 if (copy_from_user(&info
, argp
, sizeof(info
)))
7240 err
= add_new_disk(mddev
, &info
);
7244 case CLUSTERED_DISK_NACK
:
7245 if (mddev_is_clustered(mddev
))
7246 md_cluster_ops
->new_disk_ack(mddev
, false);
7252 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
7256 err
= do_md_run(mddev
);
7259 case SET_BITMAP_FILE
:
7260 err
= set_bitmap_file(mddev
, (int)arg
);
7269 if (mddev
->hold_active
== UNTIL_IOCTL
&&
7271 mddev
->hold_active
= 0;
7272 mddev_unlock(mddev
);
7274 if(did_set_md_closing
)
7275 clear_bit(MD_CLOSING
, &mddev
->flags
);
7278 #ifdef CONFIG_COMPAT
7279 static int md_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
7280 unsigned int cmd
, unsigned long arg
)
7283 case HOT_REMOVE_DISK
:
7285 case SET_DISK_FAULTY
:
7286 case SET_BITMAP_FILE
:
7287 /* These take in integer arg, do not convert */
7290 arg
= (unsigned long)compat_ptr(arg
);
7294 return md_ioctl(bdev
, mode
, cmd
, arg
);
7296 #endif /* CONFIG_COMPAT */
7298 static int md_open(struct block_device
*bdev
, fmode_t mode
)
7301 * Succeed if we can lock the mddev, which confirms that
7302 * it isn't being stopped right now.
7304 struct mddev
*mddev
= mddev_find(bdev
->bd_dev
);
7310 if (mddev
->gendisk
!= bdev
->bd_disk
) {
7311 /* we are racing with mddev_put which is discarding this
7315 /* Wait until bdev->bd_disk is definitely gone */
7316 flush_workqueue(md_misc_wq
);
7317 /* Then retry the open from the top */
7318 return -ERESTARTSYS
;
7320 BUG_ON(mddev
!= bdev
->bd_disk
->private_data
);
7322 if ((err
= mutex_lock_interruptible(&mddev
->open_mutex
)))
7325 if (test_bit(MD_CLOSING
, &mddev
->flags
)) {
7326 mutex_unlock(&mddev
->open_mutex
);
7332 atomic_inc(&mddev
->openers
);
7333 mutex_unlock(&mddev
->open_mutex
);
7335 check_disk_change(bdev
);
7342 static void md_release(struct gendisk
*disk
, fmode_t mode
)
7344 struct mddev
*mddev
= disk
->private_data
;
7347 atomic_dec(&mddev
->openers
);
7351 static int md_media_changed(struct gendisk
*disk
)
7353 struct mddev
*mddev
= disk
->private_data
;
7355 return mddev
->changed
;
7358 static int md_revalidate(struct gendisk
*disk
)
7360 struct mddev
*mddev
= disk
->private_data
;
7365 static const struct block_device_operations md_fops
=
7367 .owner
= THIS_MODULE
,
7369 .release
= md_release
,
7371 #ifdef CONFIG_COMPAT
7372 .compat_ioctl
= md_compat_ioctl
,
7374 .getgeo
= md_getgeo
,
7375 .media_changed
= md_media_changed
,
7376 .revalidate_disk
= md_revalidate
,
7379 static int md_thread(void *arg
)
7381 struct md_thread
*thread
= arg
;
7384 * md_thread is a 'system-thread', it's priority should be very
7385 * high. We avoid resource deadlocks individually in each
7386 * raid personality. (RAID5 does preallocation) We also use RR and
7387 * the very same RT priority as kswapd, thus we will never get
7388 * into a priority inversion deadlock.
7390 * we definitely have to have equal or higher priority than
7391 * bdflush, otherwise bdflush will deadlock if there are too
7392 * many dirty RAID5 blocks.
7395 allow_signal(SIGKILL
);
7396 while (!kthread_should_stop()) {
7398 /* We need to wait INTERRUPTIBLE so that
7399 * we don't add to the load-average.
7400 * That means we need to be sure no signals are
7403 if (signal_pending(current
))
7404 flush_signals(current
);
7406 wait_event_interruptible_timeout
7408 test_bit(THREAD_WAKEUP
, &thread
->flags
)
7409 || kthread_should_stop() || kthread_should_park(),
7412 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
7413 if (kthread_should_park())
7415 if (!kthread_should_stop())
7416 thread
->run(thread
);
7422 void md_wakeup_thread(struct md_thread
*thread
)
7425 pr_debug("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
7426 if (!test_and_set_bit(THREAD_WAKEUP
, &thread
->flags
))
7427 wake_up(&thread
->wqueue
);
7430 EXPORT_SYMBOL(md_wakeup_thread
);
7432 struct md_thread
*md_register_thread(void (*run
) (struct md_thread
*),
7433 struct mddev
*mddev
, const char *name
)
7435 struct md_thread
*thread
;
7437 thread
= kzalloc(sizeof(struct md_thread
), GFP_KERNEL
);
7441 init_waitqueue_head(&thread
->wqueue
);
7444 thread
->mddev
= mddev
;
7445 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
7446 thread
->tsk
= kthread_run(md_thread
, thread
,
7448 mdname(thread
->mddev
),
7450 if (IS_ERR(thread
->tsk
)) {
7456 EXPORT_SYMBOL(md_register_thread
);
7458 void md_unregister_thread(struct md_thread
**threadp
)
7460 struct md_thread
*thread
= *threadp
;
7463 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread
->tsk
));
7464 /* Locking ensures that mddev_unlock does not wake_up a
7465 * non-existent thread
7467 spin_lock(&pers_lock
);
7469 spin_unlock(&pers_lock
);
7471 kthread_stop(thread
->tsk
);
7474 EXPORT_SYMBOL(md_unregister_thread
);
7476 void md_error(struct mddev
*mddev
, struct md_rdev
*rdev
)
7478 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
7481 if (!mddev
->pers
|| !mddev
->pers
->error_handler
)
7483 mddev
->pers
->error_handler(mddev
,rdev
);
7484 if (mddev
->degraded
)
7485 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7486 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
7487 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7488 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7489 md_wakeup_thread(mddev
->thread
);
7490 if (mddev
->event_work
.func
)
7491 queue_work(md_misc_wq
, &mddev
->event_work
);
7492 md_new_event(mddev
);
7494 EXPORT_SYMBOL(md_error
);
7496 /* seq_file implementation /proc/mdstat */
7498 static void status_unused(struct seq_file
*seq
)
7501 struct md_rdev
*rdev
;
7503 seq_printf(seq
, "unused devices: ");
7505 list_for_each_entry(rdev
, &pending_raid_disks
, same_set
) {
7506 char b
[BDEVNAME_SIZE
];
7508 seq_printf(seq
, "%s ",
7509 bdevname(rdev
->bdev
,b
));
7512 seq_printf(seq
, "<none>");
7514 seq_printf(seq
, "\n");
7517 static int status_resync(struct seq_file
*seq
, struct mddev
*mddev
)
7519 sector_t max_sectors
, resync
, res
;
7520 unsigned long dt
, db
;
7523 unsigned int per_milli
;
7525 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
7526 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
7527 max_sectors
= mddev
->resync_max_sectors
;
7529 max_sectors
= mddev
->dev_sectors
;
7531 resync
= mddev
->curr_resync
;
7533 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
7534 /* Still cleaning up */
7535 resync
= max_sectors
;
7537 resync
-= atomic_read(&mddev
->recovery_active
);
7540 if (mddev
->recovery_cp
< MaxSector
) {
7541 seq_printf(seq
, "\tresync=PENDING");
7547 seq_printf(seq
, "\tresync=DELAYED");
7551 WARN_ON(max_sectors
== 0);
7552 /* Pick 'scale' such that (resync>>scale)*1000 will fit
7553 * in a sector_t, and (max_sectors>>scale) will fit in a
7554 * u32, as those are the requirements for sector_div.
7555 * Thus 'scale' must be at least 10
7558 if (sizeof(sector_t
) > sizeof(unsigned long)) {
7559 while ( max_sectors
/2 > (1ULL<<(scale
+32)))
7562 res
= (resync
>>scale
)*1000;
7563 sector_div(res
, (u32
)((max_sectors
>>scale
)+1));
7567 int i
, x
= per_milli
/50, y
= 20-x
;
7568 seq_printf(seq
, "[");
7569 for (i
= 0; i
< x
; i
++)
7570 seq_printf(seq
, "=");
7571 seq_printf(seq
, ">");
7572 for (i
= 0; i
< y
; i
++)
7573 seq_printf(seq
, ".");
7574 seq_printf(seq
, "] ");
7576 seq_printf(seq
, " %s =%3u.%u%% (%llu/%llu)",
7577 (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)?
7579 (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)?
7581 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
7582 "resync" : "recovery"))),
7583 per_milli
/10, per_milli
% 10,
7584 (unsigned long long) resync
/2,
7585 (unsigned long long) max_sectors
/2);
7588 * dt: time from mark until now
7589 * db: blocks written from mark until now
7590 * rt: remaining time
7592 * rt is a sector_t, so could be 32bit or 64bit.
7593 * So we divide before multiply in case it is 32bit and close
7595 * We scale the divisor (db) by 32 to avoid losing precision
7596 * near the end of resync when the number of remaining sectors
7598 * We then divide rt by 32 after multiplying by db to compensate.
7599 * The '+1' avoids division by zero if db is very small.
7601 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
7603 db
= (mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
))
7604 - mddev
->resync_mark_cnt
;
7606 rt
= max_sectors
- resync
; /* number of remaining sectors */
7607 sector_div(rt
, db
/32+1);
7611 seq_printf(seq
, " finish=%lu.%lumin", (unsigned long)rt
/ 60,
7612 ((unsigned long)rt
% 60)/6);
7614 seq_printf(seq
, " speed=%ldK/sec", db
/2/dt
);
7618 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
7620 struct list_head
*tmp
;
7622 struct mddev
*mddev
;
7630 spin_lock(&all_mddevs_lock
);
7631 list_for_each(tmp
,&all_mddevs
)
7633 mddev
= list_entry(tmp
, struct mddev
, all_mddevs
);
7635 spin_unlock(&all_mddevs_lock
);
7638 spin_unlock(&all_mddevs_lock
);
7640 return (void*)2;/* tail */
7644 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
7646 struct list_head
*tmp
;
7647 struct mddev
*next_mddev
, *mddev
= v
;
7653 spin_lock(&all_mddevs_lock
);
7655 tmp
= all_mddevs
.next
;
7657 tmp
= mddev
->all_mddevs
.next
;
7658 if (tmp
!= &all_mddevs
)
7659 next_mddev
= mddev_get(list_entry(tmp
,struct mddev
,all_mddevs
));
7661 next_mddev
= (void*)2;
7664 spin_unlock(&all_mddevs_lock
);
7672 static void md_seq_stop(struct seq_file
*seq
, void *v
)
7674 struct mddev
*mddev
= v
;
7676 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
7680 static int md_seq_show(struct seq_file
*seq
, void *v
)
7682 struct mddev
*mddev
= v
;
7684 struct md_rdev
*rdev
;
7686 if (v
== (void*)1) {
7687 struct md_personality
*pers
;
7688 seq_printf(seq
, "Personalities : ");
7689 spin_lock(&pers_lock
);
7690 list_for_each_entry(pers
, &pers_list
, list
)
7691 seq_printf(seq
, "[%s] ", pers
->name
);
7693 spin_unlock(&pers_lock
);
7694 seq_printf(seq
, "\n");
7695 seq
->poll_event
= atomic_read(&md_event_count
);
7698 if (v
== (void*)2) {
7703 spin_lock(&mddev
->lock
);
7704 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
7705 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
7706 mddev
->pers
? "" : "in");
7709 seq_printf(seq
, " (read-only)");
7711 seq_printf(seq
, " (auto-read-only)");
7712 seq_printf(seq
, " %s", mddev
->pers
->name
);
7717 rdev_for_each_rcu(rdev
, mddev
) {
7718 char b
[BDEVNAME_SIZE
];
7719 seq_printf(seq
, " %s[%d]",
7720 bdevname(rdev
->bdev
,b
), rdev
->desc_nr
);
7721 if (test_bit(WriteMostly
, &rdev
->flags
))
7722 seq_printf(seq
, "(W)");
7723 if (test_bit(Journal
, &rdev
->flags
))
7724 seq_printf(seq
, "(J)");
7725 if (test_bit(Faulty
, &rdev
->flags
)) {
7726 seq_printf(seq
, "(F)");
7729 if (rdev
->raid_disk
< 0)
7730 seq_printf(seq
, "(S)"); /* spare */
7731 if (test_bit(Replacement
, &rdev
->flags
))
7732 seq_printf(seq
, "(R)");
7733 sectors
+= rdev
->sectors
;
7737 if (!list_empty(&mddev
->disks
)) {
7739 seq_printf(seq
, "\n %llu blocks",
7740 (unsigned long long)
7741 mddev
->array_sectors
/ 2);
7743 seq_printf(seq
, "\n %llu blocks",
7744 (unsigned long long)sectors
/ 2);
7746 if (mddev
->persistent
) {
7747 if (mddev
->major_version
!= 0 ||
7748 mddev
->minor_version
!= 90) {
7749 seq_printf(seq
," super %d.%d",
7750 mddev
->major_version
,
7751 mddev
->minor_version
);
7753 } else if (mddev
->external
)
7754 seq_printf(seq
, " super external:%s",
7755 mddev
->metadata_type
);
7757 seq_printf(seq
, " super non-persistent");
7760 mddev
->pers
->status(seq
, mddev
);
7761 seq_printf(seq
, "\n ");
7762 if (mddev
->pers
->sync_request
) {
7763 if (status_resync(seq
, mddev
))
7764 seq_printf(seq
, "\n ");
7767 seq_printf(seq
, "\n ");
7769 bitmap_status(seq
, mddev
->bitmap
);
7771 seq_printf(seq
, "\n");
7773 spin_unlock(&mddev
->lock
);
7778 static const struct seq_operations md_seq_ops
= {
7779 .start
= md_seq_start
,
7780 .next
= md_seq_next
,
7781 .stop
= md_seq_stop
,
7782 .show
= md_seq_show
,
7785 static int md_seq_open(struct inode
*inode
, struct file
*file
)
7787 struct seq_file
*seq
;
7790 error
= seq_open(file
, &md_seq_ops
);
7794 seq
= file
->private_data
;
7795 seq
->poll_event
= atomic_read(&md_event_count
);
7799 static int md_unloading
;
7800 static unsigned int mdstat_poll(struct file
*filp
, poll_table
*wait
)
7802 struct seq_file
*seq
= filp
->private_data
;
7806 return POLLIN
|POLLRDNORM
|POLLERR
|POLLPRI
;
7807 poll_wait(filp
, &md_event_waiters
, wait
);
7809 /* always allow read */
7810 mask
= POLLIN
| POLLRDNORM
;
7812 if (seq
->poll_event
!= atomic_read(&md_event_count
))
7813 mask
|= POLLERR
| POLLPRI
;
7817 static const struct file_operations md_seq_fops
= {
7818 .owner
= THIS_MODULE
,
7819 .open
= md_seq_open
,
7821 .llseek
= seq_lseek
,
7822 .release
= seq_release_private
,
7823 .poll
= mdstat_poll
,
7826 int register_md_personality(struct md_personality
*p
)
7828 pr_debug("md: %s personality registered for level %d\n",
7830 spin_lock(&pers_lock
);
7831 list_add_tail(&p
->list
, &pers_list
);
7832 spin_unlock(&pers_lock
);
7835 EXPORT_SYMBOL(register_md_personality
);
7837 int unregister_md_personality(struct md_personality
*p
)
7839 pr_debug("md: %s personality unregistered\n", p
->name
);
7840 spin_lock(&pers_lock
);
7841 list_del_init(&p
->list
);
7842 spin_unlock(&pers_lock
);
7845 EXPORT_SYMBOL(unregister_md_personality
);
7847 int register_md_cluster_operations(struct md_cluster_operations
*ops
,
7848 struct module
*module
)
7851 spin_lock(&pers_lock
);
7852 if (md_cluster_ops
!= NULL
)
7855 md_cluster_ops
= ops
;
7856 md_cluster_mod
= module
;
7858 spin_unlock(&pers_lock
);
7861 EXPORT_SYMBOL(register_md_cluster_operations
);
7863 int unregister_md_cluster_operations(void)
7865 spin_lock(&pers_lock
);
7866 md_cluster_ops
= NULL
;
7867 spin_unlock(&pers_lock
);
7870 EXPORT_SYMBOL(unregister_md_cluster_operations
);
7872 int md_setup_cluster(struct mddev
*mddev
, int nodes
)
7874 if (!md_cluster_ops
)
7875 request_module("md-cluster");
7876 spin_lock(&pers_lock
);
7877 /* ensure module won't be unloaded */
7878 if (!md_cluster_ops
|| !try_module_get(md_cluster_mod
)) {
7879 pr_warn("can't find md-cluster module or get it's reference.\n");
7880 spin_unlock(&pers_lock
);
7883 spin_unlock(&pers_lock
);
7885 return md_cluster_ops
->join(mddev
, nodes
);
7888 void md_cluster_stop(struct mddev
*mddev
)
7890 if (!md_cluster_ops
)
7892 md_cluster_ops
->leave(mddev
);
7893 module_put(md_cluster_mod
);
7896 static int is_mddev_idle(struct mddev
*mddev
, int init
)
7898 struct md_rdev
*rdev
;
7904 rdev_for_each_rcu(rdev
, mddev
) {
7905 struct gendisk
*disk
= rdev
->bdev
->bd_contains
->bd_disk
;
7906 curr_events
= (int)part_stat_read(&disk
->part0
, sectors
[0]) +
7907 (int)part_stat_read(&disk
->part0
, sectors
[1]) -
7908 atomic_read(&disk
->sync_io
);
7909 /* sync IO will cause sync_io to increase before the disk_stats
7910 * as sync_io is counted when a request starts, and
7911 * disk_stats is counted when it completes.
7912 * So resync activity will cause curr_events to be smaller than
7913 * when there was no such activity.
7914 * non-sync IO will cause disk_stat to increase without
7915 * increasing sync_io so curr_events will (eventually)
7916 * be larger than it was before. Once it becomes
7917 * substantially larger, the test below will cause
7918 * the array to appear non-idle, and resync will slow
7920 * If there is a lot of outstanding resync activity when
7921 * we set last_event to curr_events, then all that activity
7922 * completing might cause the array to appear non-idle
7923 * and resync will be slowed down even though there might
7924 * not have been non-resync activity. This will only
7925 * happen once though. 'last_events' will soon reflect
7926 * the state where there is little or no outstanding
7927 * resync requests, and further resync activity will
7928 * always make curr_events less than last_events.
7931 if (init
|| curr_events
- rdev
->last_events
> 64) {
7932 rdev
->last_events
= curr_events
;
7940 void md_done_sync(struct mddev
*mddev
, int blocks
, int ok
)
7942 /* another "blocks" (512byte) blocks have been synced */
7943 atomic_sub(blocks
, &mddev
->recovery_active
);
7944 wake_up(&mddev
->recovery_wait
);
7946 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7947 set_bit(MD_RECOVERY_ERROR
, &mddev
->recovery
);
7948 md_wakeup_thread(mddev
->thread
);
7949 // stop recovery, signal do_sync ....
7952 EXPORT_SYMBOL(md_done_sync
);
7954 /* md_write_start(mddev, bi)
7955 * If we need to update some array metadata (e.g. 'active' flag
7956 * in superblock) before writing, schedule a superblock update
7957 * and wait for it to complete.
7958 * A return value of 'false' means that the write wasn't recorded
7959 * and cannot proceed as the array is being suspend.
7961 bool md_write_start(struct mddev
*mddev
, struct bio
*bi
)
7964 if (bio_data_dir(bi
) != WRITE
)
7967 BUG_ON(mddev
->ro
== 1);
7968 if (mddev
->ro
== 2) {
7969 /* need to switch to read/write */
7971 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7972 md_wakeup_thread(mddev
->thread
);
7973 md_wakeup_thread(mddev
->sync_thread
);
7977 percpu_ref_get(&mddev
->writes_pending
);
7978 smp_mb(); /* Match smp_mb in set_in_sync() */
7979 if (mddev
->safemode
== 1)
7980 mddev
->safemode
= 0;
7981 /* sync_checkers is always 0 when writes_pending is in per-cpu mode */
7982 if (mddev
->in_sync
|| !mddev
->sync_checkers
) {
7983 spin_lock(&mddev
->lock
);
7984 if (mddev
->in_sync
) {
7986 set_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
7987 set_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
7988 md_wakeup_thread(mddev
->thread
);
7991 spin_unlock(&mddev
->lock
);
7995 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7996 wait_event(mddev
->sb_wait
,
7997 !test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
) && !mddev
->suspended
);
7998 if (test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
)) {
7999 percpu_ref_put(&mddev
->writes_pending
);
8004 EXPORT_SYMBOL(md_write_start
);
8006 /* md_write_inc can only be called when md_write_start() has
8007 * already been called at least once of the current request.
8008 * It increments the counter and is useful when a single request
8009 * is split into several parts. Each part causes an increment and
8010 * so needs a matching md_write_end().
8011 * Unlike md_write_start(), it is safe to call md_write_inc() inside
8012 * a spinlocked region.
8014 void md_write_inc(struct mddev
*mddev
, struct bio
*bi
)
8016 if (bio_data_dir(bi
) != WRITE
)
8018 WARN_ON_ONCE(mddev
->in_sync
|| mddev
->ro
);
8019 percpu_ref_get(&mddev
->writes_pending
);
8021 EXPORT_SYMBOL(md_write_inc
);
8023 void md_write_end(struct mddev
*mddev
)
8025 percpu_ref_put(&mddev
->writes_pending
);
8027 if (mddev
->safemode
== 2)
8028 md_wakeup_thread(mddev
->thread
);
8029 else if (mddev
->safemode_delay
)
8030 /* The roundup() ensures this only performs locking once
8031 * every ->safemode_delay jiffies
8033 mod_timer(&mddev
->safemode_timer
,
8034 roundup(jiffies
, mddev
->safemode_delay
) +
8035 mddev
->safemode_delay
);
8038 EXPORT_SYMBOL(md_write_end
);
8040 /* md_allow_write(mddev)
8041 * Calling this ensures that the array is marked 'active' so that writes
8042 * may proceed without blocking. It is important to call this before
8043 * attempting a GFP_KERNEL allocation while holding the mddev lock.
8044 * Must be called with mddev_lock held.
8046 void md_allow_write(struct mddev
*mddev
)
8052 if (!mddev
->pers
->sync_request
)
8055 spin_lock(&mddev
->lock
);
8056 if (mddev
->in_sync
) {
8058 set_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
8059 set_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
8060 if (mddev
->safemode_delay
&&
8061 mddev
->safemode
== 0)
8062 mddev
->safemode
= 1;
8063 spin_unlock(&mddev
->lock
);
8064 md_update_sb(mddev
, 0);
8065 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
8066 /* wait for the dirty state to be recorded in the metadata */
8067 wait_event(mddev
->sb_wait
,
8068 !test_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
) &&
8069 !test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
));
8071 spin_unlock(&mddev
->lock
);
8073 EXPORT_SYMBOL_GPL(md_allow_write
);
8075 #define SYNC_MARKS 10
8076 #define SYNC_MARK_STEP (3*HZ)
8077 #define UPDATE_FREQUENCY (5*60*HZ)
8078 void md_do_sync(struct md_thread
*thread
)
8080 struct mddev
*mddev
= thread
->mddev
;
8081 struct mddev
*mddev2
;
8082 unsigned int currspeed
= 0,
8084 sector_t max_sectors
,j
, io_sectors
, recovery_done
;
8085 unsigned long mark
[SYNC_MARKS
];
8086 unsigned long update_time
;
8087 sector_t mark_cnt
[SYNC_MARKS
];
8089 struct list_head
*tmp
;
8090 sector_t last_check
;
8092 struct md_rdev
*rdev
;
8093 char *desc
, *action
= NULL
;
8094 struct blk_plug plug
;
8097 /* just incase thread restarts... */
8098 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
8100 if (mddev
->ro
) {/* never try to sync a read-only array */
8101 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8105 if (mddev_is_clustered(mddev
)) {
8106 ret
= md_cluster_ops
->resync_start(mddev
);
8110 set_bit(MD_CLUSTER_RESYNC_LOCKED
, &mddev
->flags
);
8111 if (!(test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
8112 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) ||
8113 test_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
))
8114 && ((unsigned long long)mddev
->curr_resync_completed
8115 < (unsigned long long)mddev
->resync_max_sectors
))
8119 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
8120 if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)) {
8121 desc
= "data-check";
8123 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
8124 desc
= "requested-resync";
8128 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
8133 mddev
->last_sync_action
= action
?: desc
;
8135 /* we overload curr_resync somewhat here.
8136 * 0 == not engaged in resync at all
8137 * 2 == checking that there is no conflict with another sync
8138 * 1 == like 2, but have yielded to allow conflicting resync to
8140 * other == active in resync - this many blocks
8142 * Before starting a resync we must have set curr_resync to
8143 * 2, and then checked that every "conflicting" array has curr_resync
8144 * less than ours. When we find one that is the same or higher
8145 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
8146 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
8147 * This will mean we have to start checking from the beginning again.
8152 int mddev2_minor
= -1;
8153 mddev
->curr_resync
= 2;
8156 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
8158 for_each_mddev(mddev2
, tmp
) {
8159 if (mddev2
== mddev
)
8161 if (!mddev
->parallel_resync
8162 && mddev2
->curr_resync
8163 && match_mddev_units(mddev
, mddev2
)) {
8165 if (mddev
< mddev2
&& mddev
->curr_resync
== 2) {
8166 /* arbitrarily yield */
8167 mddev
->curr_resync
= 1;
8168 wake_up(&resync_wait
);
8170 if (mddev
> mddev2
&& mddev
->curr_resync
== 1)
8171 /* no need to wait here, we can wait the next
8172 * time 'round when curr_resync == 2
8175 /* We need to wait 'interruptible' so as not to
8176 * contribute to the load average, and not to
8177 * be caught by 'softlockup'
8179 prepare_to_wait(&resync_wait
, &wq
, TASK_INTERRUPTIBLE
);
8180 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
8181 mddev2
->curr_resync
>= mddev
->curr_resync
) {
8182 if (mddev2_minor
!= mddev2
->md_minor
) {
8183 mddev2_minor
= mddev2
->md_minor
;
8184 pr_info("md: delaying %s of %s until %s has finished (they share one or more physical units)\n",
8185 desc
, mdname(mddev
),
8189 if (signal_pending(current
))
8190 flush_signals(current
);
8192 finish_wait(&resync_wait
, &wq
);
8195 finish_wait(&resync_wait
, &wq
);
8198 } while (mddev
->curr_resync
< 2);
8201 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
8202 /* resync follows the size requested by the personality,
8203 * which defaults to physical size, but can be virtual size
8205 max_sectors
= mddev
->resync_max_sectors
;
8206 atomic64_set(&mddev
->resync_mismatches
, 0);
8207 /* we don't use the checkpoint if there's a bitmap */
8208 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
8209 j
= mddev
->resync_min
;
8210 else if (!mddev
->bitmap
)
8211 j
= mddev
->recovery_cp
;
8213 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
8214 max_sectors
= mddev
->resync_max_sectors
;
8216 /* recovery follows the physical size of devices */
8217 max_sectors
= mddev
->dev_sectors
;
8220 rdev_for_each_rcu(rdev
, mddev
)
8221 if (rdev
->raid_disk
>= 0 &&
8222 !test_bit(Journal
, &rdev
->flags
) &&
8223 !test_bit(Faulty
, &rdev
->flags
) &&
8224 !test_bit(In_sync
, &rdev
->flags
) &&
8225 rdev
->recovery_offset
< j
)
8226 j
= rdev
->recovery_offset
;
8229 /* If there is a bitmap, we need to make sure all
8230 * writes that started before we added a spare
8231 * complete before we start doing a recovery.
8232 * Otherwise the write might complete and (via
8233 * bitmap_endwrite) set a bit in the bitmap after the
8234 * recovery has checked that bit and skipped that
8237 if (mddev
->bitmap
) {
8238 mddev
->pers
->quiesce(mddev
, 1);
8239 mddev
->pers
->quiesce(mddev
, 0);
8243 pr_info("md: %s of RAID array %s\n", desc
, mdname(mddev
));
8244 pr_debug("md: minimum _guaranteed_ speed: %d KB/sec/disk.\n", speed_min(mddev
));
8245 pr_debug("md: using maximum available idle IO bandwidth (but not more than %d KB/sec) for %s.\n",
8246 speed_max(mddev
), desc
);
8248 is_mddev_idle(mddev
, 1); /* this initializes IO event counters */
8251 for (m
= 0; m
< SYNC_MARKS
; m
++) {
8253 mark_cnt
[m
] = io_sectors
;
8256 mddev
->resync_mark
= mark
[last_mark
];
8257 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
8260 * Tune reconstruction:
8262 window
= 32*(PAGE_SIZE
/512);
8263 pr_debug("md: using %dk window, over a total of %lluk.\n",
8264 window
/2, (unsigned long long)max_sectors
/2);
8266 atomic_set(&mddev
->recovery_active
, 0);
8270 pr_debug("md: resuming %s of %s from checkpoint.\n",
8271 desc
, mdname(mddev
));
8272 mddev
->curr_resync
= j
;
8274 mddev
->curr_resync
= 3; /* no longer delayed */
8275 mddev
->curr_resync_completed
= j
;
8276 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
8277 md_new_event(mddev
);
8278 update_time
= jiffies
;
8280 blk_start_plug(&plug
);
8281 while (j
< max_sectors
) {
8286 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
8287 ((mddev
->curr_resync
> mddev
->curr_resync_completed
&&
8288 (mddev
->curr_resync
- mddev
->curr_resync_completed
)
8289 > (max_sectors
>> 4)) ||
8290 time_after_eq(jiffies
, update_time
+ UPDATE_FREQUENCY
) ||
8291 (j
- mddev
->curr_resync_completed
)*2
8292 >= mddev
->resync_max
- mddev
->curr_resync_completed
||
8293 mddev
->curr_resync_completed
> mddev
->resync_max
8295 /* time to update curr_resync_completed */
8296 wait_event(mddev
->recovery_wait
,
8297 atomic_read(&mddev
->recovery_active
) == 0);
8298 mddev
->curr_resync_completed
= j
;
8299 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) &&
8300 j
> mddev
->recovery_cp
)
8301 mddev
->recovery_cp
= j
;
8302 update_time
= jiffies
;
8303 set_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
8304 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
8307 while (j
>= mddev
->resync_max
&&
8308 !test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
8309 /* As this condition is controlled by user-space,
8310 * we can block indefinitely, so use '_interruptible'
8311 * to avoid triggering warnings.
8313 flush_signals(current
); /* just in case */
8314 wait_event_interruptible(mddev
->recovery_wait
,
8315 mddev
->resync_max
> j
8316 || test_bit(MD_RECOVERY_INTR
,
8320 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
8323 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
);
8325 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8329 if (!skipped
) { /* actual IO requested */
8330 io_sectors
+= sectors
;
8331 atomic_add(sectors
, &mddev
->recovery_active
);
8334 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
8338 if (j
> max_sectors
)
8339 /* when skipping, extra large numbers can be returned. */
8342 mddev
->curr_resync
= j
;
8343 mddev
->curr_mark_cnt
= io_sectors
;
8344 if (last_check
== 0)
8345 /* this is the earliest that rebuild will be
8346 * visible in /proc/mdstat
8348 md_new_event(mddev
);
8350 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
8353 last_check
= io_sectors
;
8355 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
8357 int next
= (last_mark
+1) % SYNC_MARKS
;
8359 mddev
->resync_mark
= mark
[next
];
8360 mddev
->resync_mark_cnt
= mark_cnt
[next
];
8361 mark
[next
] = jiffies
;
8362 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
8366 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
8370 * this loop exits only if either when we are slower than
8371 * the 'hard' speed limit, or the system was IO-idle for
8373 * the system might be non-idle CPU-wise, but we only care
8374 * about not overloading the IO subsystem. (things like an
8375 * e2fsck being done on the RAID array should execute fast)
8379 recovery_done
= io_sectors
- atomic_read(&mddev
->recovery_active
);
8380 currspeed
= ((unsigned long)(recovery_done
- mddev
->resync_mark_cnt
))/2
8381 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
8383 if (currspeed
> speed_min(mddev
)) {
8384 if (currspeed
> speed_max(mddev
)) {
8388 if (!is_mddev_idle(mddev
, 0)) {
8390 * Give other IO more of a chance.
8391 * The faster the devices, the less we wait.
8393 wait_event(mddev
->recovery_wait
,
8394 !atomic_read(&mddev
->recovery_active
));
8398 pr_info("md: %s: %s %s.\n",mdname(mddev
), desc
,
8399 test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)
8400 ? "interrupted" : "done");
8402 * this also signals 'finished resyncing' to md_stop
8404 blk_finish_plug(&plug
);
8405 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
8407 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
8408 !test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
8409 mddev
->curr_resync
> 3) {
8410 mddev
->curr_resync_completed
= mddev
->curr_resync
;
8411 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
8413 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
);
8415 if (!test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
) &&
8416 mddev
->curr_resync
> 3) {
8417 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
8418 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
8419 if (mddev
->curr_resync
>= mddev
->recovery_cp
) {
8420 pr_debug("md: checkpointing %s of %s.\n",
8421 desc
, mdname(mddev
));
8422 if (test_bit(MD_RECOVERY_ERROR
,
8424 mddev
->recovery_cp
=
8425 mddev
->curr_resync_completed
;
8427 mddev
->recovery_cp
=
8431 mddev
->recovery_cp
= MaxSector
;
8433 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
8434 mddev
->curr_resync
= MaxSector
;
8436 rdev_for_each_rcu(rdev
, mddev
)
8437 if (rdev
->raid_disk
>= 0 &&
8438 mddev
->delta_disks
>= 0 &&
8439 !test_bit(Journal
, &rdev
->flags
) &&
8440 !test_bit(Faulty
, &rdev
->flags
) &&
8441 !test_bit(In_sync
, &rdev
->flags
) &&
8442 rdev
->recovery_offset
< mddev
->curr_resync
)
8443 rdev
->recovery_offset
= mddev
->curr_resync
;
8448 /* set CHANGE_PENDING here since maybe another update is needed,
8449 * so other nodes are informed. It should be harmless for normal
8451 set_mask_bits(&mddev
->sb_flags
, 0,
8452 BIT(MD_SB_CHANGE_PENDING
) | BIT(MD_SB_CHANGE_DEVS
));
8454 spin_lock(&mddev
->lock
);
8455 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
8456 /* We completed so min/max setting can be forgotten if used. */
8457 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
8458 mddev
->resync_min
= 0;
8459 mddev
->resync_max
= MaxSector
;
8460 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
8461 mddev
->resync_min
= mddev
->curr_resync_completed
;
8462 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
8463 mddev
->curr_resync
= 0;
8464 spin_unlock(&mddev
->lock
);
8466 wake_up(&resync_wait
);
8467 md_wakeup_thread(mddev
->thread
);
8470 EXPORT_SYMBOL_GPL(md_do_sync
);
8472 static int remove_and_add_spares(struct mddev
*mddev
,
8473 struct md_rdev
*this)
8475 struct md_rdev
*rdev
;
8478 bool remove_some
= false;
8480 rdev_for_each(rdev
, mddev
) {
8481 if ((this == NULL
|| rdev
== this) &&
8482 rdev
->raid_disk
>= 0 &&
8483 !test_bit(Blocked
, &rdev
->flags
) &&
8484 test_bit(Faulty
, &rdev
->flags
) &&
8485 atomic_read(&rdev
->nr_pending
)==0) {
8486 /* Faulty non-Blocked devices with nr_pending == 0
8487 * never get nr_pending incremented,
8488 * never get Faulty cleared, and never get Blocked set.
8489 * So we can synchronize_rcu now rather than once per device
8492 set_bit(RemoveSynchronized
, &rdev
->flags
);
8498 rdev_for_each(rdev
, mddev
) {
8499 if ((this == NULL
|| rdev
== this) &&
8500 rdev
->raid_disk
>= 0 &&
8501 !test_bit(Blocked
, &rdev
->flags
) &&
8502 ((test_bit(RemoveSynchronized
, &rdev
->flags
) ||
8503 (!test_bit(In_sync
, &rdev
->flags
) &&
8504 !test_bit(Journal
, &rdev
->flags
))) &&
8505 atomic_read(&rdev
->nr_pending
)==0)) {
8506 if (mddev
->pers
->hot_remove_disk(
8507 mddev
, rdev
) == 0) {
8508 sysfs_unlink_rdev(mddev
, rdev
);
8509 rdev
->raid_disk
= -1;
8513 if (remove_some
&& test_bit(RemoveSynchronized
, &rdev
->flags
))
8514 clear_bit(RemoveSynchronized
, &rdev
->flags
);
8517 if (removed
&& mddev
->kobj
.sd
)
8518 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
8520 if (this && removed
)
8523 rdev_for_each(rdev
, mddev
) {
8524 if (this && this != rdev
)
8526 if (test_bit(Candidate
, &rdev
->flags
))
8528 if (rdev
->raid_disk
>= 0 &&
8529 !test_bit(In_sync
, &rdev
->flags
) &&
8530 !test_bit(Journal
, &rdev
->flags
) &&
8531 !test_bit(Faulty
, &rdev
->flags
))
8533 if (rdev
->raid_disk
>= 0)
8535 if (test_bit(Faulty
, &rdev
->flags
))
8537 if (!test_bit(Journal
, &rdev
->flags
)) {
8539 ! (rdev
->saved_raid_disk
>= 0 &&
8540 !test_bit(Bitmap_sync
, &rdev
->flags
)))
8543 rdev
->recovery_offset
= 0;
8546 hot_add_disk(mddev
, rdev
) == 0) {
8547 if (sysfs_link_rdev(mddev
, rdev
))
8548 /* failure here is OK */;
8549 if (!test_bit(Journal
, &rdev
->flags
))
8551 md_new_event(mddev
);
8552 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
8557 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
8561 static void md_start_sync(struct work_struct
*ws
)
8563 struct mddev
*mddev
= container_of(ws
, struct mddev
, del_work
);
8565 mddev
->sync_thread
= md_register_thread(md_do_sync
,
8568 if (!mddev
->sync_thread
) {
8569 pr_warn("%s: could not start resync thread...\n",
8571 /* leave the spares where they are, it shouldn't hurt */
8572 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8573 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
8574 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
8575 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
8576 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8577 wake_up(&resync_wait
);
8578 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
8580 if (mddev
->sysfs_action
)
8581 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
8583 md_wakeup_thread(mddev
->sync_thread
);
8584 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
8585 md_new_event(mddev
);
8589 * This routine is regularly called by all per-raid-array threads to
8590 * deal with generic issues like resync and super-block update.
8591 * Raid personalities that don't have a thread (linear/raid0) do not
8592 * need this as they never do any recovery or update the superblock.
8594 * It does not do any resync itself, but rather "forks" off other threads
8595 * to do that as needed.
8596 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
8597 * "->recovery" and create a thread at ->sync_thread.
8598 * When the thread finishes it sets MD_RECOVERY_DONE
8599 * and wakeups up this thread which will reap the thread and finish up.
8600 * This thread also removes any faulty devices (with nr_pending == 0).
8602 * The overall approach is:
8603 * 1/ if the superblock needs updating, update it.
8604 * 2/ If a recovery thread is running, don't do anything else.
8605 * 3/ If recovery has finished, clean up, possibly marking spares active.
8606 * 4/ If there are any faulty devices, remove them.
8607 * 5/ If array is degraded, try to add spares devices
8608 * 6/ If array has spares or is not in-sync, start a resync thread.
8610 void md_check_recovery(struct mddev
*mddev
)
8612 if (mddev
->suspended
)
8616 bitmap_daemon_work(mddev
);
8618 if (signal_pending(current
)) {
8619 if (mddev
->pers
->sync_request
&& !mddev
->external
) {
8620 pr_debug("md: %s in immediate safe mode\n",
8622 mddev
->safemode
= 2;
8624 flush_signals(current
);
8627 if (mddev
->ro
&& !test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
8630 (mddev
->sb_flags
& ~ (1<<MD_SB_CHANGE_PENDING
)) ||
8631 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
8632 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
8633 (mddev
->external
== 0 && mddev
->safemode
== 1) ||
8634 (mddev
->safemode
== 2
8635 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
8639 if (mddev_trylock(mddev
)) {
8643 struct md_rdev
*rdev
;
8644 if (!mddev
->external
&& mddev
->in_sync
)
8645 /* 'Blocked' flag not needed as failed devices
8646 * will be recorded if array switched to read/write.
8647 * Leaving it set will prevent the device
8648 * from being removed.
8650 rdev_for_each(rdev
, mddev
)
8651 clear_bit(Blocked
, &rdev
->flags
);
8652 /* On a read-only array we can:
8653 * - remove failed devices
8654 * - add already-in_sync devices if the array itself
8656 * As we only add devices that are already in-sync,
8657 * we can activate the spares immediately.
8659 remove_and_add_spares(mddev
, NULL
);
8660 /* There is no thread, but we need to call
8661 * ->spare_active and clear saved_raid_disk
8663 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8664 md_reap_sync_thread(mddev
);
8665 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8666 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
8667 clear_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
8671 if (mddev_is_clustered(mddev
)) {
8672 struct md_rdev
*rdev
;
8673 /* kick the device if another node issued a
8676 rdev_for_each(rdev
, mddev
) {
8677 if (test_and_clear_bit(ClusterRemove
, &rdev
->flags
) &&
8678 rdev
->raid_disk
< 0)
8679 md_kick_rdev_from_array(rdev
);
8683 if (!mddev
->external
&& !mddev
->in_sync
) {
8684 spin_lock(&mddev
->lock
);
8686 spin_unlock(&mddev
->lock
);
8689 if (mddev
->sb_flags
)
8690 md_update_sb(mddev
, 0);
8692 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
8693 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
8694 /* resync/recovery still happening */
8695 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
8698 if (mddev
->sync_thread
) {
8699 md_reap_sync_thread(mddev
);
8702 /* Set RUNNING before clearing NEEDED to avoid
8703 * any transients in the value of "sync_action".
8705 mddev
->curr_resync_completed
= 0;
8706 spin_lock(&mddev
->lock
);
8707 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8708 spin_unlock(&mddev
->lock
);
8709 /* Clear some bits that don't mean anything, but
8712 clear_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8713 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
8715 if (!test_and_clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
8716 test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
8718 /* no recovery is running.
8719 * remove any failed drives, then
8720 * add spares if possible.
8721 * Spares are also removed and re-added, to allow
8722 * the personality to fail the re-add.
8725 if (mddev
->reshape_position
!= MaxSector
) {
8726 if (mddev
->pers
->check_reshape
== NULL
||
8727 mddev
->pers
->check_reshape(mddev
) != 0)
8728 /* Cannot proceed */
8730 set_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
8731 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8732 } else if ((spares
= remove_and_add_spares(mddev
, NULL
))) {
8733 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8734 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
8735 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
8736 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8737 } else if (mddev
->recovery_cp
< MaxSector
) {
8738 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8739 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8740 } else if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
8741 /* nothing to be done ... */
8744 if (mddev
->pers
->sync_request
) {
8746 /* We are adding a device or devices to an array
8747 * which has the bitmap stored on all devices.
8748 * So make sure all bitmap pages get written
8750 bitmap_write_all(mddev
->bitmap
);
8752 INIT_WORK(&mddev
->del_work
, md_start_sync
);
8753 queue_work(md_misc_wq
, &mddev
->del_work
);
8757 if (!mddev
->sync_thread
) {
8758 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8759 wake_up(&resync_wait
);
8760 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
8762 if (mddev
->sysfs_action
)
8763 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
8766 wake_up(&mddev
->sb_wait
);
8767 mddev_unlock(mddev
);
8770 EXPORT_SYMBOL(md_check_recovery
);
8772 void md_reap_sync_thread(struct mddev
*mddev
)
8774 struct md_rdev
*rdev
;
8776 /* resync has finished, collect result */
8777 md_unregister_thread(&mddev
->sync_thread
);
8778 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
8779 !test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
8781 /* activate any spares */
8782 if (mddev
->pers
->spare_active(mddev
)) {
8783 sysfs_notify(&mddev
->kobj
, NULL
,
8785 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
8788 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
8789 mddev
->pers
->finish_reshape
)
8790 mddev
->pers
->finish_reshape(mddev
);
8792 /* If array is no-longer degraded, then any saved_raid_disk
8793 * information must be scrapped.
8795 if (!mddev
->degraded
)
8796 rdev_for_each(rdev
, mddev
)
8797 rdev
->saved_raid_disk
= -1;
8799 md_update_sb(mddev
, 1);
8800 /* MD_SB_CHANGE_PENDING should be cleared by md_update_sb, so we can
8801 * call resync_finish here if MD_CLUSTER_RESYNC_LOCKED is set by
8803 if (test_and_clear_bit(MD_CLUSTER_RESYNC_LOCKED
, &mddev
->flags
))
8804 md_cluster_ops
->resync_finish(mddev
);
8805 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8806 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
8807 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8808 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
8809 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
8810 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
8811 wake_up(&resync_wait
);
8812 /* flag recovery needed just to double check */
8813 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
8814 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
8815 md_new_event(mddev
);
8816 if (mddev
->event_work
.func
)
8817 queue_work(md_misc_wq
, &mddev
->event_work
);
8819 EXPORT_SYMBOL(md_reap_sync_thread
);
8821 void md_wait_for_blocked_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
8823 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
8824 wait_event_timeout(rdev
->blocked_wait
,
8825 !test_bit(Blocked
, &rdev
->flags
) &&
8826 !test_bit(BlockedBadBlocks
, &rdev
->flags
),
8827 msecs_to_jiffies(5000));
8828 rdev_dec_pending(rdev
, mddev
);
8830 EXPORT_SYMBOL(md_wait_for_blocked_rdev
);
8832 void md_finish_reshape(struct mddev
*mddev
)
8834 /* called be personality module when reshape completes. */
8835 struct md_rdev
*rdev
;
8837 rdev_for_each(rdev
, mddev
) {
8838 if (rdev
->data_offset
> rdev
->new_data_offset
)
8839 rdev
->sectors
+= rdev
->data_offset
- rdev
->new_data_offset
;
8841 rdev
->sectors
-= rdev
->new_data_offset
- rdev
->data_offset
;
8842 rdev
->data_offset
= rdev
->new_data_offset
;
8845 EXPORT_SYMBOL(md_finish_reshape
);
8847 /* Bad block management */
8849 /* Returns 1 on success, 0 on failure */
8850 int rdev_set_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
8853 struct mddev
*mddev
= rdev
->mddev
;
8856 s
+= rdev
->new_data_offset
;
8858 s
+= rdev
->data_offset
;
8859 rv
= badblocks_set(&rdev
->badblocks
, s
, sectors
, 0);
8861 /* Make sure they get written out promptly */
8862 if (test_bit(ExternalBbl
, &rdev
->flags
))
8863 sysfs_notify(&rdev
->kobj
, NULL
,
8864 "unacknowledged_bad_blocks");
8865 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
8866 set_mask_bits(&mddev
->sb_flags
, 0,
8867 BIT(MD_SB_CHANGE_CLEAN
) | BIT(MD_SB_CHANGE_PENDING
));
8868 md_wakeup_thread(rdev
->mddev
->thread
);
8873 EXPORT_SYMBOL_GPL(rdev_set_badblocks
);
8875 int rdev_clear_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
8880 s
+= rdev
->new_data_offset
;
8882 s
+= rdev
->data_offset
;
8883 rv
= badblocks_clear(&rdev
->badblocks
, s
, sectors
);
8884 if ((rv
== 0) && test_bit(ExternalBbl
, &rdev
->flags
))
8885 sysfs_notify(&rdev
->kobj
, NULL
, "bad_blocks");
8888 EXPORT_SYMBOL_GPL(rdev_clear_badblocks
);
8890 static int md_notify_reboot(struct notifier_block
*this,
8891 unsigned long code
, void *x
)
8893 struct list_head
*tmp
;
8894 struct mddev
*mddev
;
8897 for_each_mddev(mddev
, tmp
) {
8898 if (mddev_trylock(mddev
)) {
8900 __md_stop_writes(mddev
);
8901 if (mddev
->persistent
)
8902 mddev
->safemode
= 2;
8903 mddev_unlock(mddev
);
8908 * certain more exotic SCSI devices are known to be
8909 * volatile wrt too early system reboots. While the
8910 * right place to handle this issue is the given
8911 * driver, we do want to have a safe RAID driver ...
8919 static struct notifier_block md_notifier
= {
8920 .notifier_call
= md_notify_reboot
,
8922 .priority
= INT_MAX
, /* before any real devices */
8925 static void md_geninit(void)
8927 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
8929 proc_create("mdstat", S_IRUGO
, NULL
, &md_seq_fops
);
8932 static int __init
md_init(void)
8936 md_wq
= alloc_workqueue("md", WQ_MEM_RECLAIM
, 0);
8940 md_misc_wq
= alloc_workqueue("md_misc", 0, 0);
8944 if ((ret
= register_blkdev(MD_MAJOR
, "md")) < 0)
8947 if ((ret
= register_blkdev(0, "mdp")) < 0)
8951 blk_register_region(MKDEV(MD_MAJOR
, 0), 512, THIS_MODULE
,
8952 md_probe
, NULL
, NULL
);
8953 blk_register_region(MKDEV(mdp_major
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
8954 md_probe
, NULL
, NULL
);
8956 register_reboot_notifier(&md_notifier
);
8957 raid_table_header
= register_sysctl_table(raid_root_table
);
8963 unregister_blkdev(MD_MAJOR
, "md");
8965 destroy_workqueue(md_misc_wq
);
8967 destroy_workqueue(md_wq
);
8972 static void check_sb_changes(struct mddev
*mddev
, struct md_rdev
*rdev
)
8974 struct mdp_superblock_1
*sb
= page_address(rdev
->sb_page
);
8975 struct md_rdev
*rdev2
;
8977 char b
[BDEVNAME_SIZE
];
8980 * If size is changed in another node then we need to
8981 * do resize as well.
8983 if (mddev
->dev_sectors
!= le64_to_cpu(sb
->size
)) {
8984 ret
= mddev
->pers
->resize(mddev
, le64_to_cpu(sb
->size
));
8986 pr_info("md-cluster: resize failed\n");
8988 bitmap_update_sb(mddev
->bitmap
);
8991 /* Check for change of roles in the active devices */
8992 rdev_for_each(rdev2
, mddev
) {
8993 if (test_bit(Faulty
, &rdev2
->flags
))
8996 /* Check if the roles changed */
8997 role
= le16_to_cpu(sb
->dev_roles
[rdev2
->desc_nr
]);
8999 if (test_bit(Candidate
, &rdev2
->flags
)) {
9000 if (role
== 0xfffe) {
9001 pr_info("md: Removing Candidate device %s because add failed\n", bdevname(rdev2
->bdev
,b
));
9002 md_kick_rdev_from_array(rdev2
);
9006 clear_bit(Candidate
, &rdev2
->flags
);
9009 if (role
!= rdev2
->raid_disk
) {
9011 if (rdev2
->raid_disk
== -1 && role
!= 0xffff) {
9012 rdev2
->saved_raid_disk
= role
;
9013 ret
= remove_and_add_spares(mddev
, rdev2
);
9014 pr_info("Activated spare: %s\n",
9015 bdevname(rdev2
->bdev
,b
));
9016 /* wakeup mddev->thread here, so array could
9017 * perform resync with the new activated disk */
9018 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
9019 md_wakeup_thread(mddev
->thread
);
9023 * We just want to do the minimum to mark the disk
9024 * as faulty. The recovery is performed by the
9025 * one who initiated the error.
9027 if ((role
== 0xfffe) || (role
== 0xfffd)) {
9028 md_error(mddev
, rdev2
);
9029 clear_bit(Blocked
, &rdev2
->flags
);
9034 if (mddev
->raid_disks
!= le32_to_cpu(sb
->raid_disks
))
9035 update_raid_disks(mddev
, le32_to_cpu(sb
->raid_disks
));
9037 /* Finally set the event to be up to date */
9038 mddev
->events
= le64_to_cpu(sb
->events
);
9041 static int read_rdev(struct mddev
*mddev
, struct md_rdev
*rdev
)
9044 struct page
*swapout
= rdev
->sb_page
;
9045 struct mdp_superblock_1
*sb
;
9047 /* Store the sb page of the rdev in the swapout temporary
9048 * variable in case we err in the future
9050 rdev
->sb_page
= NULL
;
9051 err
= alloc_disk_sb(rdev
);
9053 ClearPageUptodate(rdev
->sb_page
);
9054 rdev
->sb_loaded
= 0;
9055 err
= super_types
[mddev
->major_version
].
9056 load_super(rdev
, NULL
, mddev
->minor_version
);
9059 pr_warn("%s: %d Could not reload rdev(%d) err: %d. Restoring old values\n",
9060 __func__
, __LINE__
, rdev
->desc_nr
, err
);
9062 put_page(rdev
->sb_page
);
9063 rdev
->sb_page
= swapout
;
9064 rdev
->sb_loaded
= 1;
9068 sb
= page_address(rdev
->sb_page
);
9069 /* Read the offset unconditionally, even if MD_FEATURE_RECOVERY_OFFSET
9073 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RECOVERY_OFFSET
))
9074 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
9076 /* The other node finished recovery, call spare_active to set
9077 * device In_sync and mddev->degraded
9079 if (rdev
->recovery_offset
== MaxSector
&&
9080 !test_bit(In_sync
, &rdev
->flags
) &&
9081 mddev
->pers
->spare_active(mddev
))
9082 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
9088 void md_reload_sb(struct mddev
*mddev
, int nr
)
9090 struct md_rdev
*rdev
;
9094 rdev_for_each_rcu(rdev
, mddev
) {
9095 if (rdev
->desc_nr
== nr
)
9099 if (!rdev
|| rdev
->desc_nr
!= nr
) {
9100 pr_warn("%s: %d Could not find rdev with nr %d\n", __func__
, __LINE__
, nr
);
9104 err
= read_rdev(mddev
, rdev
);
9108 check_sb_changes(mddev
, rdev
);
9110 /* Read all rdev's to update recovery_offset */
9111 rdev_for_each_rcu(rdev
, mddev
)
9112 read_rdev(mddev
, rdev
);
9114 EXPORT_SYMBOL(md_reload_sb
);
9119 * Searches all registered partitions for autorun RAID arrays
9123 static DEFINE_MUTEX(detected_devices_mutex
);
9124 static LIST_HEAD(all_detected_devices
);
9125 struct detected_devices_node
{
9126 struct list_head list
;
9130 void md_autodetect_dev(dev_t dev
)
9132 struct detected_devices_node
*node_detected_dev
;
9134 node_detected_dev
= kzalloc(sizeof(*node_detected_dev
), GFP_KERNEL
);
9135 if (node_detected_dev
) {
9136 node_detected_dev
->dev
= dev
;
9137 mutex_lock(&detected_devices_mutex
);
9138 list_add_tail(&node_detected_dev
->list
, &all_detected_devices
);
9139 mutex_unlock(&detected_devices_mutex
);
9143 static void autostart_arrays(int part
)
9145 struct md_rdev
*rdev
;
9146 struct detected_devices_node
*node_detected_dev
;
9148 int i_scanned
, i_passed
;
9153 pr_info("md: Autodetecting RAID arrays.\n");
9155 mutex_lock(&detected_devices_mutex
);
9156 while (!list_empty(&all_detected_devices
) && i_scanned
< INT_MAX
) {
9158 node_detected_dev
= list_entry(all_detected_devices
.next
,
9159 struct detected_devices_node
, list
);
9160 list_del(&node_detected_dev
->list
);
9161 dev
= node_detected_dev
->dev
;
9162 kfree(node_detected_dev
);
9163 mutex_unlock(&detected_devices_mutex
);
9164 rdev
= md_import_device(dev
,0, 90);
9165 mutex_lock(&detected_devices_mutex
);
9169 if (test_bit(Faulty
, &rdev
->flags
))
9172 set_bit(AutoDetected
, &rdev
->flags
);
9173 list_add(&rdev
->same_set
, &pending_raid_disks
);
9176 mutex_unlock(&detected_devices_mutex
);
9178 pr_debug("md: Scanned %d and added %d devices.\n", i_scanned
, i_passed
);
9180 autorun_devices(part
);
9183 #endif /* !MODULE */
9185 static __exit
void md_exit(void)
9187 struct mddev
*mddev
;
9188 struct list_head
*tmp
;
9191 blk_unregister_region(MKDEV(MD_MAJOR
,0), 512);
9192 blk_unregister_region(MKDEV(mdp_major
,0), 1U << MINORBITS
);
9194 unregister_blkdev(MD_MAJOR
,"md");
9195 unregister_blkdev(mdp_major
, "mdp");
9196 unregister_reboot_notifier(&md_notifier
);
9197 unregister_sysctl_table(raid_table_header
);
9199 /* We cannot unload the modules while some process is
9200 * waiting for us in select() or poll() - wake them up
9203 while (waitqueue_active(&md_event_waiters
)) {
9204 /* not safe to leave yet */
9205 wake_up(&md_event_waiters
);
9209 remove_proc_entry("mdstat", NULL
);
9211 for_each_mddev(mddev
, tmp
) {
9212 export_array(mddev
);
9214 mddev
->hold_active
= 0;
9216 * for_each_mddev() will call mddev_put() at the end of each
9217 * iteration. As the mddev is now fully clear, this will
9218 * schedule the mddev for destruction by a workqueue, and the
9219 * destroy_workqueue() below will wait for that to complete.
9222 destroy_workqueue(md_misc_wq
);
9223 destroy_workqueue(md_wq
);
9226 subsys_initcall(md_init
);
9227 module_exit(md_exit
)
9229 static int get_ro(char *buffer
, struct kernel_param
*kp
)
9231 return sprintf(buffer
, "%d", start_readonly
);
9233 static int set_ro(const char *val
, struct kernel_param
*kp
)
9235 return kstrtouint(val
, 10, (unsigned int *)&start_readonly
);
9238 module_param_call(start_ro
, set_ro
, get_ro
, NULL
, S_IRUSR
|S_IWUSR
);
9239 module_param(start_dirty_degraded
, int, S_IRUGO
|S_IWUSR
);
9240 module_param_call(new_array
, add_named_array
, NULL
, NULL
, S_IWUSR
);
9241 module_param(create_on_open
, bool, S_IRUSR
|S_IWUSR
);
9243 MODULE_LICENSE("GPL");
9244 MODULE_DESCRIPTION("MD RAID framework");
9246 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);