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
;
280 smp_rmb(); /* Ensure implications of 'active' are visible */
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 mddev
->pers
->make_request(mddev
, bio
);
307 cpu
= part_stat_lock();
308 part_stat_inc(cpu
, &mddev
->gendisk
->part0
, ios
[rw
]);
309 part_stat_add(cpu
, &mddev
->gendisk
->part0
, sectors
[rw
], sectors
);
312 if (atomic_dec_and_test(&mddev
->active_io
) && mddev
->suspended
)
313 wake_up(&mddev
->sb_wait
);
315 return BLK_QC_T_NONE
;
318 /* mddev_suspend makes sure no new requests are submitted
319 * to the device, and that any requests that have been submitted
320 * are completely handled.
321 * Once mddev_detach() is called and completes, the module will be
324 void mddev_suspend(struct mddev
*mddev
)
326 WARN_ON_ONCE(mddev
->thread
&& current
== mddev
->thread
->tsk
);
327 if (mddev
->suspended
++)
330 wait_event(mddev
->sb_wait
, atomic_read(&mddev
->active_io
) == 0);
331 mddev
->pers
->quiesce(mddev
, 1);
333 del_timer_sync(&mddev
->safemode_timer
);
335 EXPORT_SYMBOL_GPL(mddev_suspend
);
337 void mddev_resume(struct mddev
*mddev
)
339 if (--mddev
->suspended
)
341 wake_up(&mddev
->sb_wait
);
342 mddev
->pers
->quiesce(mddev
, 0);
344 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
345 md_wakeup_thread(mddev
->thread
);
346 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
348 EXPORT_SYMBOL_GPL(mddev_resume
);
350 int mddev_congested(struct mddev
*mddev
, int bits
)
352 struct md_personality
*pers
= mddev
->pers
;
356 if (mddev
->suspended
)
358 else if (pers
&& pers
->congested
)
359 ret
= pers
->congested(mddev
, bits
);
363 EXPORT_SYMBOL_GPL(mddev_congested
);
364 static int md_congested(void *data
, int bits
)
366 struct mddev
*mddev
= data
;
367 return mddev_congested(mddev
, bits
);
371 * Generic flush handling for md
374 static void md_end_flush(struct bio
*bio
)
376 struct md_rdev
*rdev
= bio
->bi_private
;
377 struct mddev
*mddev
= rdev
->mddev
;
379 rdev_dec_pending(rdev
, mddev
);
381 if (atomic_dec_and_test(&mddev
->flush_pending
)) {
382 /* The pre-request flush has finished */
383 queue_work(md_wq
, &mddev
->flush_work
);
388 static void md_submit_flush_data(struct work_struct
*ws
);
390 static void submit_flushes(struct work_struct
*ws
)
392 struct mddev
*mddev
= container_of(ws
, struct mddev
, flush_work
);
393 struct md_rdev
*rdev
;
395 INIT_WORK(&mddev
->flush_work
, md_submit_flush_data
);
396 atomic_set(&mddev
->flush_pending
, 1);
398 rdev_for_each_rcu(rdev
, mddev
)
399 if (rdev
->raid_disk
>= 0 &&
400 !test_bit(Faulty
, &rdev
->flags
)) {
401 /* Take two references, one is dropped
402 * when request finishes, one after
403 * we reclaim rcu_read_lock
406 atomic_inc(&rdev
->nr_pending
);
407 atomic_inc(&rdev
->nr_pending
);
409 bi
= bio_alloc_mddev(GFP_NOIO
, 0, mddev
);
410 bi
->bi_end_io
= md_end_flush
;
411 bi
->bi_private
= rdev
;
412 bi
->bi_bdev
= rdev
->bdev
;
413 bi
->bi_opf
= REQ_OP_WRITE
| REQ_PREFLUSH
;
414 atomic_inc(&mddev
->flush_pending
);
417 rdev_dec_pending(rdev
, mddev
);
420 if (atomic_dec_and_test(&mddev
->flush_pending
))
421 queue_work(md_wq
, &mddev
->flush_work
);
424 static void md_submit_flush_data(struct work_struct
*ws
)
426 struct mddev
*mddev
= container_of(ws
, struct mddev
, flush_work
);
427 struct bio
*bio
= mddev
->flush_bio
;
429 if (bio
->bi_iter
.bi_size
== 0)
430 /* an empty barrier - all done */
433 bio
->bi_opf
&= ~REQ_PREFLUSH
;
434 mddev
->pers
->make_request(mddev
, bio
);
437 mddev
->flush_bio
= NULL
;
438 wake_up(&mddev
->sb_wait
);
441 void md_flush_request(struct mddev
*mddev
, struct bio
*bio
)
443 spin_lock_irq(&mddev
->lock
);
444 wait_event_lock_irq(mddev
->sb_wait
,
447 mddev
->flush_bio
= bio
;
448 spin_unlock_irq(&mddev
->lock
);
450 INIT_WORK(&mddev
->flush_work
, submit_flushes
);
451 queue_work(md_wq
, &mddev
->flush_work
);
453 EXPORT_SYMBOL(md_flush_request
);
455 static inline struct mddev
*mddev_get(struct mddev
*mddev
)
457 atomic_inc(&mddev
->active
);
461 static void mddev_delayed_delete(struct work_struct
*ws
);
463 static void mddev_put(struct mddev
*mddev
)
465 struct bio_set
*bs
= NULL
;
467 if (!atomic_dec_and_lock(&mddev
->active
, &all_mddevs_lock
))
469 if (!mddev
->raid_disks
&& list_empty(&mddev
->disks
) &&
470 mddev
->ctime
== 0 && !mddev
->hold_active
) {
471 /* Array is not configured at all, and not held active,
473 list_del_init(&mddev
->all_mddevs
);
475 mddev
->bio_set
= NULL
;
476 if (mddev
->gendisk
) {
477 /* We did a probe so need to clean up. Call
478 * queue_work inside the spinlock so that
479 * flush_workqueue() after mddev_find will
480 * succeed in waiting for the work to be done.
482 INIT_WORK(&mddev
->del_work
, mddev_delayed_delete
);
483 queue_work(md_misc_wq
, &mddev
->del_work
);
487 spin_unlock(&all_mddevs_lock
);
492 static void md_safemode_timeout(unsigned long data
);
494 void mddev_init(struct mddev
*mddev
)
496 mutex_init(&mddev
->open_mutex
);
497 mutex_init(&mddev
->reconfig_mutex
);
498 mutex_init(&mddev
->bitmap_info
.mutex
);
499 INIT_LIST_HEAD(&mddev
->disks
);
500 INIT_LIST_HEAD(&mddev
->all_mddevs
);
501 setup_timer(&mddev
->safemode_timer
, md_safemode_timeout
,
502 (unsigned long) mddev
);
503 atomic_set(&mddev
->active
, 1);
504 atomic_set(&mddev
->openers
, 0);
505 atomic_set(&mddev
->active_io
, 0);
506 spin_lock_init(&mddev
->lock
);
507 atomic_set(&mddev
->flush_pending
, 0);
508 init_waitqueue_head(&mddev
->sb_wait
);
509 init_waitqueue_head(&mddev
->recovery_wait
);
510 mddev
->reshape_position
= MaxSector
;
511 mddev
->reshape_backwards
= 0;
512 mddev
->last_sync_action
= "none";
513 mddev
->resync_min
= 0;
514 mddev
->resync_max
= MaxSector
;
515 mddev
->level
= LEVEL_NONE
;
517 EXPORT_SYMBOL_GPL(mddev_init
);
519 static struct mddev
*mddev_find(dev_t unit
)
521 struct mddev
*mddev
, *new = NULL
;
523 if (unit
&& MAJOR(unit
) != MD_MAJOR
)
524 unit
&= ~((1<<MdpMinorShift
)-1);
527 spin_lock(&all_mddevs_lock
);
530 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
531 if (mddev
->unit
== unit
) {
533 spin_unlock(&all_mddevs_lock
);
539 list_add(&new->all_mddevs
, &all_mddevs
);
540 spin_unlock(&all_mddevs_lock
);
541 new->hold_active
= UNTIL_IOCTL
;
545 /* find an unused unit number */
546 static int next_minor
= 512;
547 int start
= next_minor
;
551 dev
= MKDEV(MD_MAJOR
, next_minor
);
553 if (next_minor
> MINORMASK
)
555 if (next_minor
== start
) {
556 /* Oh dear, all in use. */
557 spin_unlock(&all_mddevs_lock
);
563 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
564 if (mddev
->unit
== dev
) {
570 new->md_minor
= MINOR(dev
);
571 new->hold_active
= UNTIL_STOP
;
572 list_add(&new->all_mddevs
, &all_mddevs
);
573 spin_unlock(&all_mddevs_lock
);
576 spin_unlock(&all_mddevs_lock
);
578 new = kzalloc(sizeof(*new), GFP_KERNEL
);
583 if (MAJOR(unit
) == MD_MAJOR
)
584 new->md_minor
= MINOR(unit
);
586 new->md_minor
= MINOR(unit
) >> MdpMinorShift
;
593 static struct attribute_group md_redundancy_group
;
595 void mddev_unlock(struct mddev
*mddev
)
597 if (mddev
->to_remove
) {
598 /* These cannot be removed under reconfig_mutex as
599 * an access to the files will try to take reconfig_mutex
600 * while holding the file unremovable, which leads to
602 * So hold set sysfs_active while the remove in happeing,
603 * and anything else which might set ->to_remove or my
604 * otherwise change the sysfs namespace will fail with
605 * -EBUSY if sysfs_active is still set.
606 * We set sysfs_active under reconfig_mutex and elsewhere
607 * test it under the same mutex to ensure its correct value
610 struct attribute_group
*to_remove
= mddev
->to_remove
;
611 mddev
->to_remove
= NULL
;
612 mddev
->sysfs_active
= 1;
613 mutex_unlock(&mddev
->reconfig_mutex
);
615 if (mddev
->kobj
.sd
) {
616 if (to_remove
!= &md_redundancy_group
)
617 sysfs_remove_group(&mddev
->kobj
, to_remove
);
618 if (mddev
->pers
== NULL
||
619 mddev
->pers
->sync_request
== NULL
) {
620 sysfs_remove_group(&mddev
->kobj
, &md_redundancy_group
);
621 if (mddev
->sysfs_action
)
622 sysfs_put(mddev
->sysfs_action
);
623 mddev
->sysfs_action
= NULL
;
626 mddev
->sysfs_active
= 0;
628 mutex_unlock(&mddev
->reconfig_mutex
);
630 /* As we've dropped the mutex we need a spinlock to
631 * make sure the thread doesn't disappear
633 spin_lock(&pers_lock
);
634 md_wakeup_thread(mddev
->thread
);
635 spin_unlock(&pers_lock
);
637 EXPORT_SYMBOL_GPL(mddev_unlock
);
639 struct md_rdev
*md_find_rdev_nr_rcu(struct mddev
*mddev
, int nr
)
641 struct md_rdev
*rdev
;
643 rdev_for_each_rcu(rdev
, mddev
)
644 if (rdev
->desc_nr
== nr
)
649 EXPORT_SYMBOL_GPL(md_find_rdev_nr_rcu
);
651 static struct md_rdev
*find_rdev(struct mddev
*mddev
, dev_t dev
)
653 struct md_rdev
*rdev
;
655 rdev_for_each(rdev
, mddev
)
656 if (rdev
->bdev
->bd_dev
== dev
)
662 static struct md_rdev
*find_rdev_rcu(struct mddev
*mddev
, dev_t dev
)
664 struct md_rdev
*rdev
;
666 rdev_for_each_rcu(rdev
, mddev
)
667 if (rdev
->bdev
->bd_dev
== dev
)
673 static struct md_personality
*find_pers(int level
, char *clevel
)
675 struct md_personality
*pers
;
676 list_for_each_entry(pers
, &pers_list
, list
) {
677 if (level
!= LEVEL_NONE
&& pers
->level
== level
)
679 if (strcmp(pers
->name
, clevel
)==0)
685 /* return the offset of the super block in 512byte sectors */
686 static inline sector_t
calc_dev_sboffset(struct md_rdev
*rdev
)
688 sector_t num_sectors
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
689 return MD_NEW_SIZE_SECTORS(num_sectors
);
692 static int alloc_disk_sb(struct md_rdev
*rdev
)
694 rdev
->sb_page
= alloc_page(GFP_KERNEL
);
700 void md_rdev_clear(struct md_rdev
*rdev
)
703 put_page(rdev
->sb_page
);
705 rdev
->sb_page
= NULL
;
710 put_page(rdev
->bb_page
);
711 rdev
->bb_page
= NULL
;
713 badblocks_exit(&rdev
->badblocks
);
715 EXPORT_SYMBOL_GPL(md_rdev_clear
);
717 static void super_written(struct bio
*bio
)
719 struct md_rdev
*rdev
= bio
->bi_private
;
720 struct mddev
*mddev
= rdev
->mddev
;
723 pr_err("md: super_written gets error=%d\n", bio
->bi_error
);
724 md_error(mddev
, rdev
);
725 if (!test_bit(Faulty
, &rdev
->flags
)
726 && (bio
->bi_opf
& MD_FAILFAST
)) {
727 set_bit(MD_SB_NEED_REWRITE
, &mddev
->sb_flags
);
728 set_bit(LastDev
, &rdev
->flags
);
731 clear_bit(LastDev
, &rdev
->flags
);
733 if (atomic_dec_and_test(&mddev
->pending_writes
))
734 wake_up(&mddev
->sb_wait
);
735 rdev_dec_pending(rdev
, mddev
);
739 void md_super_write(struct mddev
*mddev
, struct md_rdev
*rdev
,
740 sector_t sector
, int size
, struct page
*page
)
742 /* write first size bytes of page to sector of rdev
743 * Increment mddev->pending_writes before returning
744 * and decrement it on completion, waking up sb_wait
745 * if zero is reached.
746 * If an error occurred, call md_error
751 if (test_bit(Faulty
, &rdev
->flags
))
754 bio
= bio_alloc_mddev(GFP_NOIO
, 1, mddev
);
756 atomic_inc(&rdev
->nr_pending
);
758 bio
->bi_bdev
= rdev
->meta_bdev
? rdev
->meta_bdev
: rdev
->bdev
;
759 bio
->bi_iter
.bi_sector
= sector
;
760 bio_add_page(bio
, page
, size
, 0);
761 bio
->bi_private
= rdev
;
762 bio
->bi_end_io
= super_written
;
764 if (test_bit(MD_FAILFAST_SUPPORTED
, &mddev
->flags
) &&
765 test_bit(FailFast
, &rdev
->flags
) &&
766 !test_bit(LastDev
, &rdev
->flags
))
768 bio
->bi_opf
= REQ_OP_WRITE
| REQ_SYNC
| REQ_PREFLUSH
| REQ_FUA
| ff
;
770 atomic_inc(&mddev
->pending_writes
);
774 int md_super_wait(struct mddev
*mddev
)
776 /* wait for all superblock writes that were scheduled to complete */
777 wait_event(mddev
->sb_wait
, atomic_read(&mddev
->pending_writes
)==0);
778 if (test_and_clear_bit(MD_SB_NEED_REWRITE
, &mddev
->sb_flags
))
783 int sync_page_io(struct md_rdev
*rdev
, sector_t sector
, int size
,
784 struct page
*page
, int op
, int op_flags
, bool metadata_op
)
786 struct bio
*bio
= bio_alloc_mddev(GFP_NOIO
, 1, rdev
->mddev
);
789 bio
->bi_bdev
= (metadata_op
&& rdev
->meta_bdev
) ?
790 rdev
->meta_bdev
: rdev
->bdev
;
791 bio_set_op_attrs(bio
, op
, op_flags
);
793 bio
->bi_iter
.bi_sector
= sector
+ rdev
->sb_start
;
794 else if (rdev
->mddev
->reshape_position
!= MaxSector
&&
795 (rdev
->mddev
->reshape_backwards
==
796 (sector
>= rdev
->mddev
->reshape_position
)))
797 bio
->bi_iter
.bi_sector
= sector
+ rdev
->new_data_offset
;
799 bio
->bi_iter
.bi_sector
= sector
+ rdev
->data_offset
;
800 bio_add_page(bio
, page
, size
, 0);
802 submit_bio_wait(bio
);
804 ret
= !bio
->bi_error
;
808 EXPORT_SYMBOL_GPL(sync_page_io
);
810 static int read_disk_sb(struct md_rdev
*rdev
, int size
)
812 char b
[BDEVNAME_SIZE
];
817 if (!sync_page_io(rdev
, 0, size
, rdev
->sb_page
, REQ_OP_READ
, 0, true))
823 pr_err("md: disabled device %s, could not read superblock.\n",
824 bdevname(rdev
->bdev
,b
));
828 static int uuid_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
830 return sb1
->set_uuid0
== sb2
->set_uuid0
&&
831 sb1
->set_uuid1
== sb2
->set_uuid1
&&
832 sb1
->set_uuid2
== sb2
->set_uuid2
&&
833 sb1
->set_uuid3
== sb2
->set_uuid3
;
836 static int sb_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
839 mdp_super_t
*tmp1
, *tmp2
;
841 tmp1
= kmalloc(sizeof(*tmp1
),GFP_KERNEL
);
842 tmp2
= kmalloc(sizeof(*tmp2
),GFP_KERNEL
);
844 if (!tmp1
|| !tmp2
) {
853 * nr_disks is not constant
858 ret
= (memcmp(tmp1
, tmp2
, MD_SB_GENERIC_CONSTANT_WORDS
* 4) == 0);
865 static u32
md_csum_fold(u32 csum
)
867 csum
= (csum
& 0xffff) + (csum
>> 16);
868 return (csum
& 0xffff) + (csum
>> 16);
871 static unsigned int calc_sb_csum(mdp_super_t
*sb
)
874 u32
*sb32
= (u32
*)sb
;
876 unsigned int disk_csum
, csum
;
878 disk_csum
= sb
->sb_csum
;
881 for (i
= 0; i
< MD_SB_BYTES
/4 ; i
++)
883 csum
= (newcsum
& 0xffffffff) + (newcsum
>>32);
886 /* This used to use csum_partial, which was wrong for several
887 * reasons including that different results are returned on
888 * different architectures. It isn't critical that we get exactly
889 * the same return value as before (we always csum_fold before
890 * testing, and that removes any differences). However as we
891 * know that csum_partial always returned a 16bit value on
892 * alphas, do a fold to maximise conformity to previous behaviour.
894 sb
->sb_csum
= md_csum_fold(disk_csum
);
896 sb
->sb_csum
= disk_csum
;
902 * Handle superblock details.
903 * We want to be able to handle multiple superblock formats
904 * so we have a common interface to them all, and an array of
905 * different handlers.
906 * We rely on user-space to write the initial superblock, and support
907 * reading and updating of superblocks.
908 * Interface methods are:
909 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version)
910 * loads and validates a superblock on dev.
911 * if refdev != NULL, compare superblocks on both devices
913 * 0 - dev has a superblock that is compatible with refdev
914 * 1 - dev has a superblock that is compatible and newer than refdev
915 * so dev should be used as the refdev in future
916 * -EINVAL superblock incompatible or invalid
917 * -othererror e.g. -EIO
919 * int validate_super(struct mddev *mddev, struct md_rdev *dev)
920 * Verify that dev is acceptable into mddev.
921 * The first time, mddev->raid_disks will be 0, and data from
922 * dev should be merged in. Subsequent calls check that dev
923 * is new enough. Return 0 or -EINVAL
925 * void sync_super(struct mddev *mddev, struct md_rdev *dev)
926 * Update the superblock for rdev with data in mddev
927 * This does not write to disc.
933 struct module
*owner
;
934 int (*load_super
)(struct md_rdev
*rdev
,
935 struct md_rdev
*refdev
,
937 int (*validate_super
)(struct mddev
*mddev
,
938 struct md_rdev
*rdev
);
939 void (*sync_super
)(struct mddev
*mddev
,
940 struct md_rdev
*rdev
);
941 unsigned long long (*rdev_size_change
)(struct md_rdev
*rdev
,
942 sector_t num_sectors
);
943 int (*allow_new_offset
)(struct md_rdev
*rdev
,
944 unsigned long long new_offset
);
948 * Check that the given mddev has no bitmap.
950 * This function is called from the run method of all personalities that do not
951 * support bitmaps. It prints an error message and returns non-zero if mddev
952 * has a bitmap. Otherwise, it returns 0.
955 int md_check_no_bitmap(struct mddev
*mddev
)
957 if (!mddev
->bitmap_info
.file
&& !mddev
->bitmap_info
.offset
)
959 pr_warn("%s: bitmaps are not supported for %s\n",
960 mdname(mddev
), mddev
->pers
->name
);
963 EXPORT_SYMBOL(md_check_no_bitmap
);
966 * load_super for 0.90.0
968 static int super_90_load(struct md_rdev
*rdev
, struct md_rdev
*refdev
, int minor_version
)
970 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
975 * Calculate the position of the superblock (512byte sectors),
976 * it's at the end of the disk.
978 * It also happens to be a multiple of 4Kb.
980 rdev
->sb_start
= calc_dev_sboffset(rdev
);
982 ret
= read_disk_sb(rdev
, MD_SB_BYTES
);
988 bdevname(rdev
->bdev
, b
);
989 sb
= page_address(rdev
->sb_page
);
991 if (sb
->md_magic
!= MD_SB_MAGIC
) {
992 pr_warn("md: invalid raid superblock magic on %s\n", b
);
996 if (sb
->major_version
!= 0 ||
997 sb
->minor_version
< 90 ||
998 sb
->minor_version
> 91) {
999 pr_warn("Bad version number %d.%d on %s\n",
1000 sb
->major_version
, sb
->minor_version
, b
);
1004 if (sb
->raid_disks
<= 0)
1007 if (md_csum_fold(calc_sb_csum(sb
)) != md_csum_fold(sb
->sb_csum
)) {
1008 pr_warn("md: invalid superblock checksum on %s\n", b
);
1012 rdev
->preferred_minor
= sb
->md_minor
;
1013 rdev
->data_offset
= 0;
1014 rdev
->new_data_offset
= 0;
1015 rdev
->sb_size
= MD_SB_BYTES
;
1016 rdev
->badblocks
.shift
= -1;
1018 if (sb
->level
== LEVEL_MULTIPATH
)
1021 rdev
->desc_nr
= sb
->this_disk
.number
;
1027 mdp_super_t
*refsb
= page_address(refdev
->sb_page
);
1028 if (!uuid_equal(refsb
, sb
)) {
1029 pr_warn("md: %s has different UUID to %s\n",
1030 b
, bdevname(refdev
->bdev
,b2
));
1033 if (!sb_equal(refsb
, sb
)) {
1034 pr_warn("md: %s has same UUID but different superblock to %s\n",
1035 b
, bdevname(refdev
->bdev
, b2
));
1039 ev2
= md_event(refsb
);
1045 rdev
->sectors
= rdev
->sb_start
;
1046 /* Limit to 4TB as metadata cannot record more than that.
1047 * (not needed for Linear and RAID0 as metadata doesn't
1050 if (IS_ENABLED(CONFIG_LBDAF
) && (u64
)rdev
->sectors
>= (2ULL << 32) &&
1052 rdev
->sectors
= (sector_t
)(2ULL << 32) - 2;
1054 if (rdev
->sectors
< ((sector_t
)sb
->size
) * 2 && sb
->level
>= 1)
1055 /* "this cannot possibly happen" ... */
1063 * validate_super for 0.90.0
1065 static int super_90_validate(struct mddev
*mddev
, struct md_rdev
*rdev
)
1068 mdp_super_t
*sb
= page_address(rdev
->sb_page
);
1069 __u64 ev1
= md_event(sb
);
1071 rdev
->raid_disk
= -1;
1072 clear_bit(Faulty
, &rdev
->flags
);
1073 clear_bit(In_sync
, &rdev
->flags
);
1074 clear_bit(Bitmap_sync
, &rdev
->flags
);
1075 clear_bit(WriteMostly
, &rdev
->flags
);
1077 if (mddev
->raid_disks
== 0) {
1078 mddev
->major_version
= 0;
1079 mddev
->minor_version
= sb
->minor_version
;
1080 mddev
->patch_version
= sb
->patch_version
;
1081 mddev
->external
= 0;
1082 mddev
->chunk_sectors
= sb
->chunk_size
>> 9;
1083 mddev
->ctime
= sb
->ctime
;
1084 mddev
->utime
= sb
->utime
;
1085 mddev
->level
= sb
->level
;
1086 mddev
->clevel
[0] = 0;
1087 mddev
->layout
= sb
->layout
;
1088 mddev
->raid_disks
= sb
->raid_disks
;
1089 mddev
->dev_sectors
= ((sector_t
)sb
->size
) * 2;
1090 mddev
->events
= ev1
;
1091 mddev
->bitmap_info
.offset
= 0;
1092 mddev
->bitmap_info
.space
= 0;
1093 /* bitmap can use 60 K after the 4K superblocks */
1094 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
1095 mddev
->bitmap_info
.default_space
= 64*2 - (MD_SB_BYTES
>> 9);
1096 mddev
->reshape_backwards
= 0;
1098 if (mddev
->minor_version
>= 91) {
1099 mddev
->reshape_position
= sb
->reshape_position
;
1100 mddev
->delta_disks
= sb
->delta_disks
;
1101 mddev
->new_level
= sb
->new_level
;
1102 mddev
->new_layout
= sb
->new_layout
;
1103 mddev
->new_chunk_sectors
= sb
->new_chunk
>> 9;
1104 if (mddev
->delta_disks
< 0)
1105 mddev
->reshape_backwards
= 1;
1107 mddev
->reshape_position
= MaxSector
;
1108 mddev
->delta_disks
= 0;
1109 mddev
->new_level
= mddev
->level
;
1110 mddev
->new_layout
= mddev
->layout
;
1111 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1114 if (sb
->state
& (1<<MD_SB_CLEAN
))
1115 mddev
->recovery_cp
= MaxSector
;
1117 if (sb
->events_hi
== sb
->cp_events_hi
&&
1118 sb
->events_lo
== sb
->cp_events_lo
) {
1119 mddev
->recovery_cp
= sb
->recovery_cp
;
1121 mddev
->recovery_cp
= 0;
1124 memcpy(mddev
->uuid
+0, &sb
->set_uuid0
, 4);
1125 memcpy(mddev
->uuid
+4, &sb
->set_uuid1
, 4);
1126 memcpy(mddev
->uuid
+8, &sb
->set_uuid2
, 4);
1127 memcpy(mddev
->uuid
+12,&sb
->set_uuid3
, 4);
1129 mddev
->max_disks
= MD_SB_DISKS
;
1131 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
) &&
1132 mddev
->bitmap_info
.file
== NULL
) {
1133 mddev
->bitmap_info
.offset
=
1134 mddev
->bitmap_info
.default_offset
;
1135 mddev
->bitmap_info
.space
=
1136 mddev
->bitmap_info
.default_space
;
1139 } else if (mddev
->pers
== NULL
) {
1140 /* Insist on good event counter while assembling, except
1141 * for spares (which don't need an event count) */
1143 if (sb
->disks
[rdev
->desc_nr
].state
& (
1144 (1<<MD_DISK_SYNC
) | (1 << MD_DISK_ACTIVE
)))
1145 if (ev1
< mddev
->events
)
1147 } else if (mddev
->bitmap
) {
1148 /* if adding to array with a bitmap, then we can accept an
1149 * older device ... but not too old.
1151 if (ev1
< mddev
->bitmap
->events_cleared
)
1153 if (ev1
< mddev
->events
)
1154 set_bit(Bitmap_sync
, &rdev
->flags
);
1156 if (ev1
< mddev
->events
)
1157 /* just a hot-add of a new device, leave raid_disk at -1 */
1161 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1162 desc
= sb
->disks
+ rdev
->desc_nr
;
1164 if (desc
->state
& (1<<MD_DISK_FAULTY
))
1165 set_bit(Faulty
, &rdev
->flags
);
1166 else if (desc
->state
& (1<<MD_DISK_SYNC
) /* &&
1167 desc->raid_disk < mddev->raid_disks */) {
1168 set_bit(In_sync
, &rdev
->flags
);
1169 rdev
->raid_disk
= desc
->raid_disk
;
1170 rdev
->saved_raid_disk
= desc
->raid_disk
;
1171 } else if (desc
->state
& (1<<MD_DISK_ACTIVE
)) {
1172 /* active but not in sync implies recovery up to
1173 * reshape position. We don't know exactly where
1174 * that is, so set to zero for now */
1175 if (mddev
->minor_version
>= 91) {
1176 rdev
->recovery_offset
= 0;
1177 rdev
->raid_disk
= desc
->raid_disk
;
1180 if (desc
->state
& (1<<MD_DISK_WRITEMOSTLY
))
1181 set_bit(WriteMostly
, &rdev
->flags
);
1182 if (desc
->state
& (1<<MD_DISK_FAILFAST
))
1183 set_bit(FailFast
, &rdev
->flags
);
1184 } else /* MULTIPATH are always insync */
1185 set_bit(In_sync
, &rdev
->flags
);
1190 * sync_super for 0.90.0
1192 static void super_90_sync(struct mddev
*mddev
, struct md_rdev
*rdev
)
1195 struct md_rdev
*rdev2
;
1196 int next_spare
= mddev
->raid_disks
;
1198 /* make rdev->sb match mddev data..
1201 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1202 * 3/ any empty disks < next_spare become removed
1204 * disks[0] gets initialised to REMOVED because
1205 * we cannot be sure from other fields if it has
1206 * been initialised or not.
1209 int active
=0, working
=0,failed
=0,spare
=0,nr_disks
=0;
1211 rdev
->sb_size
= MD_SB_BYTES
;
1213 sb
= page_address(rdev
->sb_page
);
1215 memset(sb
, 0, sizeof(*sb
));
1217 sb
->md_magic
= MD_SB_MAGIC
;
1218 sb
->major_version
= mddev
->major_version
;
1219 sb
->patch_version
= mddev
->patch_version
;
1220 sb
->gvalid_words
= 0; /* ignored */
1221 memcpy(&sb
->set_uuid0
, mddev
->uuid
+0, 4);
1222 memcpy(&sb
->set_uuid1
, mddev
->uuid
+4, 4);
1223 memcpy(&sb
->set_uuid2
, mddev
->uuid
+8, 4);
1224 memcpy(&sb
->set_uuid3
, mddev
->uuid
+12,4);
1226 sb
->ctime
= clamp_t(time64_t
, mddev
->ctime
, 0, U32_MAX
);
1227 sb
->level
= mddev
->level
;
1228 sb
->size
= mddev
->dev_sectors
/ 2;
1229 sb
->raid_disks
= mddev
->raid_disks
;
1230 sb
->md_minor
= mddev
->md_minor
;
1231 sb
->not_persistent
= 0;
1232 sb
->utime
= clamp_t(time64_t
, mddev
->utime
, 0, U32_MAX
);
1234 sb
->events_hi
= (mddev
->events
>>32);
1235 sb
->events_lo
= (u32
)mddev
->events
;
1237 if (mddev
->reshape_position
== MaxSector
)
1238 sb
->minor_version
= 90;
1240 sb
->minor_version
= 91;
1241 sb
->reshape_position
= mddev
->reshape_position
;
1242 sb
->new_level
= mddev
->new_level
;
1243 sb
->delta_disks
= mddev
->delta_disks
;
1244 sb
->new_layout
= mddev
->new_layout
;
1245 sb
->new_chunk
= mddev
->new_chunk_sectors
<< 9;
1247 mddev
->minor_version
= sb
->minor_version
;
1250 sb
->recovery_cp
= mddev
->recovery_cp
;
1251 sb
->cp_events_hi
= (mddev
->events
>>32);
1252 sb
->cp_events_lo
= (u32
)mddev
->events
;
1253 if (mddev
->recovery_cp
== MaxSector
)
1254 sb
->state
= (1<< MD_SB_CLEAN
);
1256 sb
->recovery_cp
= 0;
1258 sb
->layout
= mddev
->layout
;
1259 sb
->chunk_size
= mddev
->chunk_sectors
<< 9;
1261 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
)
1262 sb
->state
|= (1<<MD_SB_BITMAP_PRESENT
);
1264 sb
->disks
[0].state
= (1<<MD_DISK_REMOVED
);
1265 rdev_for_each(rdev2
, mddev
) {
1268 int is_active
= test_bit(In_sync
, &rdev2
->flags
);
1270 if (rdev2
->raid_disk
>= 0 &&
1271 sb
->minor_version
>= 91)
1272 /* we have nowhere to store the recovery_offset,
1273 * but if it is not below the reshape_position,
1274 * we can piggy-back on that.
1277 if (rdev2
->raid_disk
< 0 ||
1278 test_bit(Faulty
, &rdev2
->flags
))
1281 desc_nr
= rdev2
->raid_disk
;
1283 desc_nr
= next_spare
++;
1284 rdev2
->desc_nr
= desc_nr
;
1285 d
= &sb
->disks
[rdev2
->desc_nr
];
1287 d
->number
= rdev2
->desc_nr
;
1288 d
->major
= MAJOR(rdev2
->bdev
->bd_dev
);
1289 d
->minor
= MINOR(rdev2
->bdev
->bd_dev
);
1291 d
->raid_disk
= rdev2
->raid_disk
;
1293 d
->raid_disk
= rdev2
->desc_nr
; /* compatibility */
1294 if (test_bit(Faulty
, &rdev2
->flags
))
1295 d
->state
= (1<<MD_DISK_FAULTY
);
1296 else if (is_active
) {
1297 d
->state
= (1<<MD_DISK_ACTIVE
);
1298 if (test_bit(In_sync
, &rdev2
->flags
))
1299 d
->state
|= (1<<MD_DISK_SYNC
);
1307 if (test_bit(WriteMostly
, &rdev2
->flags
))
1308 d
->state
|= (1<<MD_DISK_WRITEMOSTLY
);
1309 if (test_bit(FailFast
, &rdev2
->flags
))
1310 d
->state
|= (1<<MD_DISK_FAILFAST
);
1312 /* now set the "removed" and "faulty" bits on any missing devices */
1313 for (i
=0 ; i
< mddev
->raid_disks
; i
++) {
1314 mdp_disk_t
*d
= &sb
->disks
[i
];
1315 if (d
->state
== 0 && d
->number
== 0) {
1318 d
->state
= (1<<MD_DISK_REMOVED
);
1319 d
->state
|= (1<<MD_DISK_FAULTY
);
1323 sb
->nr_disks
= nr_disks
;
1324 sb
->active_disks
= active
;
1325 sb
->working_disks
= working
;
1326 sb
->failed_disks
= failed
;
1327 sb
->spare_disks
= spare
;
1329 sb
->this_disk
= sb
->disks
[rdev
->desc_nr
];
1330 sb
->sb_csum
= calc_sb_csum(sb
);
1334 * rdev_size_change for 0.90.0
1336 static unsigned long long
1337 super_90_rdev_size_change(struct md_rdev
*rdev
, sector_t num_sectors
)
1339 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1340 return 0; /* component must fit device */
1341 if (rdev
->mddev
->bitmap_info
.offset
)
1342 return 0; /* can't move bitmap */
1343 rdev
->sb_start
= calc_dev_sboffset(rdev
);
1344 if (!num_sectors
|| num_sectors
> rdev
->sb_start
)
1345 num_sectors
= rdev
->sb_start
;
1346 /* Limit to 4TB as metadata cannot record more than that.
1347 * 4TB == 2^32 KB, or 2*2^32 sectors.
1349 if (IS_ENABLED(CONFIG_LBDAF
) && (u64
)num_sectors
>= (2ULL << 32) &&
1350 rdev
->mddev
->level
>= 1)
1351 num_sectors
= (sector_t
)(2ULL << 32) - 2;
1353 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1355 } while (md_super_wait(rdev
->mddev
) < 0);
1360 super_90_allow_new_offset(struct md_rdev
*rdev
, unsigned long long new_offset
)
1362 /* non-zero offset changes not possible with v0.90 */
1363 return new_offset
== 0;
1367 * version 1 superblock
1370 static __le32
calc_sb_1_csum(struct mdp_superblock_1
*sb
)
1374 unsigned long long newcsum
;
1375 int size
= 256 + le32_to_cpu(sb
->max_dev
)*2;
1376 __le32
*isuper
= (__le32
*)sb
;
1378 disk_csum
= sb
->sb_csum
;
1381 for (; size
>= 4; size
-= 4)
1382 newcsum
+= le32_to_cpu(*isuper
++);
1385 newcsum
+= le16_to_cpu(*(__le16
*) isuper
);
1387 csum
= (newcsum
& 0xffffffff) + (newcsum
>> 32);
1388 sb
->sb_csum
= disk_csum
;
1389 return cpu_to_le32(csum
);
1392 static int super_1_load(struct md_rdev
*rdev
, struct md_rdev
*refdev
, int minor_version
)
1394 struct mdp_superblock_1
*sb
;
1398 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1402 * Calculate the position of the superblock in 512byte sectors.
1403 * It is always aligned to a 4K boundary and
1404 * depeding on minor_version, it can be:
1405 * 0: At least 8K, but less than 12K, from end of device
1406 * 1: At start of device
1407 * 2: 4K from start of device.
1409 switch(minor_version
) {
1411 sb_start
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1413 sb_start
&= ~(sector_t
)(4*2-1);
1424 rdev
->sb_start
= sb_start
;
1426 /* superblock is rarely larger than 1K, but it can be larger,
1427 * and it is safe to read 4k, so we do that
1429 ret
= read_disk_sb(rdev
, 4096);
1430 if (ret
) return ret
;
1432 sb
= page_address(rdev
->sb_page
);
1434 if (sb
->magic
!= cpu_to_le32(MD_SB_MAGIC
) ||
1435 sb
->major_version
!= cpu_to_le32(1) ||
1436 le32_to_cpu(sb
->max_dev
) > (4096-256)/2 ||
1437 le64_to_cpu(sb
->super_offset
) != rdev
->sb_start
||
1438 (le32_to_cpu(sb
->feature_map
) & ~MD_FEATURE_ALL
) != 0)
1441 if (calc_sb_1_csum(sb
) != sb
->sb_csum
) {
1442 pr_warn("md: invalid superblock checksum on %s\n",
1443 bdevname(rdev
->bdev
,b
));
1446 if (le64_to_cpu(sb
->data_size
) < 10) {
1447 pr_warn("md: data_size too small on %s\n",
1448 bdevname(rdev
->bdev
,b
));
1453 memcmp(sb
->pad3
, sb
->pad3
+1, sizeof(sb
->pad3
) - sizeof(sb
->pad3
[1])))
1454 /* Some padding is non-zero, might be a new feature */
1457 rdev
->preferred_minor
= 0xffff;
1458 rdev
->data_offset
= le64_to_cpu(sb
->data_offset
);
1459 rdev
->new_data_offset
= rdev
->data_offset
;
1460 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
) &&
1461 (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_NEW_OFFSET
))
1462 rdev
->new_data_offset
+= (s32
)le32_to_cpu(sb
->new_offset
);
1463 atomic_set(&rdev
->corrected_errors
, le32_to_cpu(sb
->cnt_corrected_read
));
1465 rdev
->sb_size
= le32_to_cpu(sb
->max_dev
) * 2 + 256;
1466 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1467 if (rdev
->sb_size
& bmask
)
1468 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1471 && rdev
->data_offset
< sb_start
+ (rdev
->sb_size
/512))
1474 && rdev
->new_data_offset
< sb_start
+ (rdev
->sb_size
/512))
1477 if (sb
->level
== cpu_to_le32(LEVEL_MULTIPATH
))
1480 rdev
->desc_nr
= le32_to_cpu(sb
->dev_number
);
1482 if (!rdev
->bb_page
) {
1483 rdev
->bb_page
= alloc_page(GFP_KERNEL
);
1487 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BAD_BLOCKS
) &&
1488 rdev
->badblocks
.count
== 0) {
1489 /* need to load the bad block list.
1490 * Currently we limit it to one page.
1496 int sectors
= le16_to_cpu(sb
->bblog_size
);
1497 if (sectors
> (PAGE_SIZE
/ 512))
1499 offset
= le32_to_cpu(sb
->bblog_offset
);
1502 bb_sector
= (long long)offset
;
1503 if (!sync_page_io(rdev
, bb_sector
, sectors
<< 9,
1504 rdev
->bb_page
, REQ_OP_READ
, 0, true))
1506 bbp
= (u64
*)page_address(rdev
->bb_page
);
1507 rdev
->badblocks
.shift
= sb
->bblog_shift
;
1508 for (i
= 0 ; i
< (sectors
<< (9-3)) ; i
++, bbp
++) {
1509 u64 bb
= le64_to_cpu(*bbp
);
1510 int count
= bb
& (0x3ff);
1511 u64 sector
= bb
>> 10;
1512 sector
<<= sb
->bblog_shift
;
1513 count
<<= sb
->bblog_shift
;
1516 if (badblocks_set(&rdev
->badblocks
, sector
, count
, 1))
1519 } else if (sb
->bblog_offset
!= 0)
1520 rdev
->badblocks
.shift
= 0;
1522 if (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_PPL
) {
1523 rdev
->ppl
.offset
= (__s16
)le16_to_cpu(sb
->ppl
.offset
);
1524 rdev
->ppl
.size
= le16_to_cpu(sb
->ppl
.size
);
1525 rdev
->ppl
.sector
= rdev
->sb_start
+ rdev
->ppl
.offset
;
1532 struct mdp_superblock_1
*refsb
= page_address(refdev
->sb_page
);
1534 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16) != 0 ||
1535 sb
->level
!= refsb
->level
||
1536 sb
->layout
!= refsb
->layout
||
1537 sb
->chunksize
!= refsb
->chunksize
) {
1538 pr_warn("md: %s has strangely different superblock to %s\n",
1539 bdevname(rdev
->bdev
,b
),
1540 bdevname(refdev
->bdev
,b2
));
1543 ev1
= le64_to_cpu(sb
->events
);
1544 ev2
= le64_to_cpu(refsb
->events
);
1551 if (minor_version
) {
1552 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9);
1553 sectors
-= rdev
->data_offset
;
1555 sectors
= rdev
->sb_start
;
1556 if (sectors
< le64_to_cpu(sb
->data_size
))
1558 rdev
->sectors
= le64_to_cpu(sb
->data_size
);
1562 static int super_1_validate(struct mddev
*mddev
, struct md_rdev
*rdev
)
1564 struct mdp_superblock_1
*sb
= page_address(rdev
->sb_page
);
1565 __u64 ev1
= le64_to_cpu(sb
->events
);
1567 rdev
->raid_disk
= -1;
1568 clear_bit(Faulty
, &rdev
->flags
);
1569 clear_bit(In_sync
, &rdev
->flags
);
1570 clear_bit(Bitmap_sync
, &rdev
->flags
);
1571 clear_bit(WriteMostly
, &rdev
->flags
);
1573 if (mddev
->raid_disks
== 0) {
1574 mddev
->major_version
= 1;
1575 mddev
->patch_version
= 0;
1576 mddev
->external
= 0;
1577 mddev
->chunk_sectors
= le32_to_cpu(sb
->chunksize
);
1578 mddev
->ctime
= le64_to_cpu(sb
->ctime
);
1579 mddev
->utime
= le64_to_cpu(sb
->utime
);
1580 mddev
->level
= le32_to_cpu(sb
->level
);
1581 mddev
->clevel
[0] = 0;
1582 mddev
->layout
= le32_to_cpu(sb
->layout
);
1583 mddev
->raid_disks
= le32_to_cpu(sb
->raid_disks
);
1584 mddev
->dev_sectors
= le64_to_cpu(sb
->size
);
1585 mddev
->events
= ev1
;
1586 mddev
->bitmap_info
.offset
= 0;
1587 mddev
->bitmap_info
.space
= 0;
1588 /* Default location for bitmap is 1K after superblock
1589 * using 3K - total of 4K
1591 mddev
->bitmap_info
.default_offset
= 1024 >> 9;
1592 mddev
->bitmap_info
.default_space
= (4096-1024) >> 9;
1593 mddev
->reshape_backwards
= 0;
1595 mddev
->recovery_cp
= le64_to_cpu(sb
->resync_offset
);
1596 memcpy(mddev
->uuid
, sb
->set_uuid
, 16);
1598 mddev
->max_disks
= (4096-256)/2;
1600 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
) &&
1601 mddev
->bitmap_info
.file
== NULL
) {
1602 mddev
->bitmap_info
.offset
=
1603 (__s32
)le32_to_cpu(sb
->bitmap_offset
);
1604 /* Metadata doesn't record how much space is available.
1605 * For 1.0, we assume we can use up to the superblock
1606 * if before, else to 4K beyond superblock.
1607 * For others, assume no change is possible.
1609 if (mddev
->minor_version
> 0)
1610 mddev
->bitmap_info
.space
= 0;
1611 else if (mddev
->bitmap_info
.offset
> 0)
1612 mddev
->bitmap_info
.space
=
1613 8 - mddev
->bitmap_info
.offset
;
1615 mddev
->bitmap_info
.space
=
1616 -mddev
->bitmap_info
.offset
;
1619 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
1620 mddev
->reshape_position
= le64_to_cpu(sb
->reshape_position
);
1621 mddev
->delta_disks
= le32_to_cpu(sb
->delta_disks
);
1622 mddev
->new_level
= le32_to_cpu(sb
->new_level
);
1623 mddev
->new_layout
= le32_to_cpu(sb
->new_layout
);
1624 mddev
->new_chunk_sectors
= le32_to_cpu(sb
->new_chunk
);
1625 if (mddev
->delta_disks
< 0 ||
1626 (mddev
->delta_disks
== 0 &&
1627 (le32_to_cpu(sb
->feature_map
)
1628 & MD_FEATURE_RESHAPE_BACKWARDS
)))
1629 mddev
->reshape_backwards
= 1;
1631 mddev
->reshape_position
= MaxSector
;
1632 mddev
->delta_disks
= 0;
1633 mddev
->new_level
= mddev
->level
;
1634 mddev
->new_layout
= mddev
->layout
;
1635 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1638 if (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_JOURNAL
)
1639 set_bit(MD_HAS_JOURNAL
, &mddev
->flags
);
1641 if (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_PPL
) {
1642 if (le32_to_cpu(sb
->feature_map
) &
1643 (MD_FEATURE_BITMAP_OFFSET
| MD_FEATURE_JOURNAL
))
1645 set_bit(MD_HAS_PPL
, &mddev
->flags
);
1647 } else if (mddev
->pers
== NULL
) {
1648 /* Insist of good event counter while assembling, except for
1649 * spares (which don't need an event count) */
1651 if (rdev
->desc_nr
>= 0 &&
1652 rdev
->desc_nr
< le32_to_cpu(sb
->max_dev
) &&
1653 (le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]) < MD_DISK_ROLE_MAX
||
1654 le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]) == MD_DISK_ROLE_JOURNAL
))
1655 if (ev1
< mddev
->events
)
1657 } else if (mddev
->bitmap
) {
1658 /* If adding to array with a bitmap, then we can accept an
1659 * older device, but not too old.
1661 if (ev1
< mddev
->bitmap
->events_cleared
)
1663 if (ev1
< mddev
->events
)
1664 set_bit(Bitmap_sync
, &rdev
->flags
);
1666 if (ev1
< mddev
->events
)
1667 /* just a hot-add of a new device, leave raid_disk at -1 */
1670 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1672 if (rdev
->desc_nr
< 0 ||
1673 rdev
->desc_nr
>= le32_to_cpu(sb
->max_dev
)) {
1674 role
= MD_DISK_ROLE_SPARE
;
1677 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
1679 case MD_DISK_ROLE_SPARE
: /* spare */
1681 case MD_DISK_ROLE_FAULTY
: /* faulty */
1682 set_bit(Faulty
, &rdev
->flags
);
1684 case MD_DISK_ROLE_JOURNAL
: /* journal device */
1685 if (!(le32_to_cpu(sb
->feature_map
) & MD_FEATURE_JOURNAL
)) {
1686 /* journal device without journal feature */
1687 pr_warn("md: journal device provided without journal feature, ignoring the device\n");
1690 set_bit(Journal
, &rdev
->flags
);
1691 rdev
->journal_tail
= le64_to_cpu(sb
->journal_tail
);
1692 rdev
->raid_disk
= 0;
1695 rdev
->saved_raid_disk
= role
;
1696 if ((le32_to_cpu(sb
->feature_map
) &
1697 MD_FEATURE_RECOVERY_OFFSET
)) {
1698 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
1699 if (!(le32_to_cpu(sb
->feature_map
) &
1700 MD_FEATURE_RECOVERY_BITMAP
))
1701 rdev
->saved_raid_disk
= -1;
1703 set_bit(In_sync
, &rdev
->flags
);
1704 rdev
->raid_disk
= role
;
1707 if (sb
->devflags
& WriteMostly1
)
1708 set_bit(WriteMostly
, &rdev
->flags
);
1709 if (sb
->devflags
& FailFast1
)
1710 set_bit(FailFast
, &rdev
->flags
);
1711 if (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_REPLACEMENT
)
1712 set_bit(Replacement
, &rdev
->flags
);
1713 } else /* MULTIPATH are always insync */
1714 set_bit(In_sync
, &rdev
->flags
);
1719 static void super_1_sync(struct mddev
*mddev
, struct md_rdev
*rdev
)
1721 struct mdp_superblock_1
*sb
;
1722 struct md_rdev
*rdev2
;
1724 /* make rdev->sb match mddev and rdev data. */
1726 sb
= page_address(rdev
->sb_page
);
1728 sb
->feature_map
= 0;
1730 sb
->recovery_offset
= cpu_to_le64(0);
1731 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
1733 sb
->utime
= cpu_to_le64((__u64
)mddev
->utime
);
1734 sb
->events
= cpu_to_le64(mddev
->events
);
1736 sb
->resync_offset
= cpu_to_le64(mddev
->recovery_cp
);
1737 else if (test_bit(MD_JOURNAL_CLEAN
, &mddev
->flags
))
1738 sb
->resync_offset
= cpu_to_le64(MaxSector
);
1740 sb
->resync_offset
= cpu_to_le64(0);
1742 sb
->cnt_corrected_read
= cpu_to_le32(atomic_read(&rdev
->corrected_errors
));
1744 sb
->raid_disks
= cpu_to_le32(mddev
->raid_disks
);
1745 sb
->size
= cpu_to_le64(mddev
->dev_sectors
);
1746 sb
->chunksize
= cpu_to_le32(mddev
->chunk_sectors
);
1747 sb
->level
= cpu_to_le32(mddev
->level
);
1748 sb
->layout
= cpu_to_le32(mddev
->layout
);
1749 if (test_bit(FailFast
, &rdev
->flags
))
1750 sb
->devflags
|= FailFast1
;
1752 sb
->devflags
&= ~FailFast1
;
1754 if (test_bit(WriteMostly
, &rdev
->flags
))
1755 sb
->devflags
|= WriteMostly1
;
1757 sb
->devflags
&= ~WriteMostly1
;
1758 sb
->data_offset
= cpu_to_le64(rdev
->data_offset
);
1759 sb
->data_size
= cpu_to_le64(rdev
->sectors
);
1761 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
) {
1762 sb
->bitmap_offset
= cpu_to_le32((__u32
)mddev
->bitmap_info
.offset
);
1763 sb
->feature_map
= cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
);
1766 if (rdev
->raid_disk
>= 0 && !test_bit(Journal
, &rdev
->flags
) &&
1767 !test_bit(In_sync
, &rdev
->flags
)) {
1769 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET
);
1770 sb
->recovery_offset
=
1771 cpu_to_le64(rdev
->recovery_offset
);
1772 if (rdev
->saved_raid_disk
>= 0 && mddev
->bitmap
)
1774 cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP
);
1776 /* Note: recovery_offset and journal_tail share space */
1777 if (test_bit(Journal
, &rdev
->flags
))
1778 sb
->journal_tail
= cpu_to_le64(rdev
->journal_tail
);
1779 if (test_bit(Replacement
, &rdev
->flags
))
1781 cpu_to_le32(MD_FEATURE_REPLACEMENT
);
1783 if (mddev
->reshape_position
!= MaxSector
) {
1784 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE
);
1785 sb
->reshape_position
= cpu_to_le64(mddev
->reshape_position
);
1786 sb
->new_layout
= cpu_to_le32(mddev
->new_layout
);
1787 sb
->delta_disks
= cpu_to_le32(mddev
->delta_disks
);
1788 sb
->new_level
= cpu_to_le32(mddev
->new_level
);
1789 sb
->new_chunk
= cpu_to_le32(mddev
->new_chunk_sectors
);
1790 if (mddev
->delta_disks
== 0 &&
1791 mddev
->reshape_backwards
)
1793 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS
);
1794 if (rdev
->new_data_offset
!= rdev
->data_offset
) {
1796 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET
);
1797 sb
->new_offset
= cpu_to_le32((__u32
)(rdev
->new_data_offset
1798 - rdev
->data_offset
));
1802 if (mddev_is_clustered(mddev
))
1803 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_CLUSTERED
);
1805 if (rdev
->badblocks
.count
== 0)
1806 /* Nothing to do for bad blocks*/ ;
1807 else if (sb
->bblog_offset
== 0)
1808 /* Cannot record bad blocks on this device */
1809 md_error(mddev
, rdev
);
1811 struct badblocks
*bb
= &rdev
->badblocks
;
1812 u64
*bbp
= (u64
*)page_address(rdev
->bb_page
);
1814 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_BAD_BLOCKS
);
1819 seq
= read_seqbegin(&bb
->lock
);
1821 memset(bbp
, 0xff, PAGE_SIZE
);
1823 for (i
= 0 ; i
< bb
->count
; i
++) {
1824 u64 internal_bb
= p
[i
];
1825 u64 store_bb
= ((BB_OFFSET(internal_bb
) << 10)
1826 | BB_LEN(internal_bb
));
1827 bbp
[i
] = cpu_to_le64(store_bb
);
1830 if (read_seqretry(&bb
->lock
, seq
))
1833 bb
->sector
= (rdev
->sb_start
+
1834 (int)le32_to_cpu(sb
->bblog_offset
));
1835 bb
->size
= le16_to_cpu(sb
->bblog_size
);
1840 rdev_for_each(rdev2
, mddev
)
1841 if (rdev2
->desc_nr
+1 > max_dev
)
1842 max_dev
= rdev2
->desc_nr
+1;
1844 if (max_dev
> le32_to_cpu(sb
->max_dev
)) {
1846 sb
->max_dev
= cpu_to_le32(max_dev
);
1847 rdev
->sb_size
= max_dev
* 2 + 256;
1848 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1849 if (rdev
->sb_size
& bmask
)
1850 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1852 max_dev
= le32_to_cpu(sb
->max_dev
);
1854 for (i
=0; i
<max_dev
;i
++)
1855 sb
->dev_roles
[i
] = cpu_to_le16(MD_DISK_ROLE_FAULTY
);
1857 if (test_bit(MD_HAS_JOURNAL
, &mddev
->flags
))
1858 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_JOURNAL
);
1860 if (test_bit(MD_HAS_PPL
, &mddev
->flags
)) {
1861 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_PPL
);
1862 sb
->ppl
.offset
= cpu_to_le16(rdev
->ppl
.offset
);
1863 sb
->ppl
.size
= cpu_to_le16(rdev
->ppl
.size
);
1866 rdev_for_each(rdev2
, mddev
) {
1868 if (test_bit(Faulty
, &rdev2
->flags
))
1869 sb
->dev_roles
[i
] = cpu_to_le16(MD_DISK_ROLE_FAULTY
);
1870 else if (test_bit(In_sync
, &rdev2
->flags
))
1871 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1872 else if (test_bit(Journal
, &rdev2
->flags
))
1873 sb
->dev_roles
[i
] = cpu_to_le16(MD_DISK_ROLE_JOURNAL
);
1874 else if (rdev2
->raid_disk
>= 0)
1875 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1877 sb
->dev_roles
[i
] = cpu_to_le16(MD_DISK_ROLE_SPARE
);
1880 sb
->sb_csum
= calc_sb_1_csum(sb
);
1883 static unsigned long long
1884 super_1_rdev_size_change(struct md_rdev
*rdev
, sector_t num_sectors
)
1886 struct mdp_superblock_1
*sb
;
1887 sector_t max_sectors
;
1888 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1889 return 0; /* component must fit device */
1890 if (rdev
->data_offset
!= rdev
->new_data_offset
)
1891 return 0; /* too confusing */
1892 if (rdev
->sb_start
< rdev
->data_offset
) {
1893 /* minor versions 1 and 2; superblock before data */
1894 max_sectors
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1895 max_sectors
-= rdev
->data_offset
;
1896 if (!num_sectors
|| num_sectors
> max_sectors
)
1897 num_sectors
= max_sectors
;
1898 } else if (rdev
->mddev
->bitmap_info
.offset
) {
1899 /* minor version 0 with bitmap we can't move */
1902 /* minor version 0; superblock after data */
1904 sb_start
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) - 8*2;
1905 sb_start
&= ~(sector_t
)(4*2 - 1);
1906 max_sectors
= rdev
->sectors
+ sb_start
- rdev
->sb_start
;
1907 if (!num_sectors
|| num_sectors
> max_sectors
)
1908 num_sectors
= max_sectors
;
1909 rdev
->sb_start
= sb_start
;
1911 sb
= page_address(rdev
->sb_page
);
1912 sb
->data_size
= cpu_to_le64(num_sectors
);
1913 sb
->super_offset
= cpu_to_le64(rdev
->sb_start
);
1914 sb
->sb_csum
= calc_sb_1_csum(sb
);
1916 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1918 } while (md_super_wait(rdev
->mddev
) < 0);
1924 super_1_allow_new_offset(struct md_rdev
*rdev
,
1925 unsigned long long new_offset
)
1927 /* All necessary checks on new >= old have been done */
1928 struct bitmap
*bitmap
;
1929 if (new_offset
>= rdev
->data_offset
)
1932 /* with 1.0 metadata, there is no metadata to tread on
1933 * so we can always move back */
1934 if (rdev
->mddev
->minor_version
== 0)
1937 /* otherwise we must be sure not to step on
1938 * any metadata, so stay:
1939 * 36K beyond start of superblock
1940 * beyond end of badblocks
1941 * beyond write-intent bitmap
1943 if (rdev
->sb_start
+ (32+4)*2 > new_offset
)
1945 bitmap
= rdev
->mddev
->bitmap
;
1946 if (bitmap
&& !rdev
->mddev
->bitmap_info
.file
&&
1947 rdev
->sb_start
+ rdev
->mddev
->bitmap_info
.offset
+
1948 bitmap
->storage
.file_pages
* (PAGE_SIZE
>>9) > new_offset
)
1950 if (rdev
->badblocks
.sector
+ rdev
->badblocks
.size
> new_offset
)
1956 static struct super_type super_types
[] = {
1959 .owner
= THIS_MODULE
,
1960 .load_super
= super_90_load
,
1961 .validate_super
= super_90_validate
,
1962 .sync_super
= super_90_sync
,
1963 .rdev_size_change
= super_90_rdev_size_change
,
1964 .allow_new_offset
= super_90_allow_new_offset
,
1968 .owner
= THIS_MODULE
,
1969 .load_super
= super_1_load
,
1970 .validate_super
= super_1_validate
,
1971 .sync_super
= super_1_sync
,
1972 .rdev_size_change
= super_1_rdev_size_change
,
1973 .allow_new_offset
= super_1_allow_new_offset
,
1977 static void sync_super(struct mddev
*mddev
, struct md_rdev
*rdev
)
1979 if (mddev
->sync_super
) {
1980 mddev
->sync_super(mddev
, rdev
);
1984 BUG_ON(mddev
->major_version
>= ARRAY_SIZE(super_types
));
1986 super_types
[mddev
->major_version
].sync_super(mddev
, rdev
);
1989 static int match_mddev_units(struct mddev
*mddev1
, struct mddev
*mddev2
)
1991 struct md_rdev
*rdev
, *rdev2
;
1994 rdev_for_each_rcu(rdev
, mddev1
) {
1995 if (test_bit(Faulty
, &rdev
->flags
) ||
1996 test_bit(Journal
, &rdev
->flags
) ||
1997 rdev
->raid_disk
== -1)
1999 rdev_for_each_rcu(rdev2
, mddev2
) {
2000 if (test_bit(Faulty
, &rdev2
->flags
) ||
2001 test_bit(Journal
, &rdev2
->flags
) ||
2002 rdev2
->raid_disk
== -1)
2004 if (rdev
->bdev
->bd_contains
==
2005 rdev2
->bdev
->bd_contains
) {
2015 static LIST_HEAD(pending_raid_disks
);
2018 * Try to register data integrity profile for an mddev
2020 * This is called when an array is started and after a disk has been kicked
2021 * from the array. It only succeeds if all working and active component devices
2022 * are integrity capable with matching profiles.
2024 int md_integrity_register(struct mddev
*mddev
)
2026 struct md_rdev
*rdev
, *reference
= NULL
;
2028 if (list_empty(&mddev
->disks
))
2029 return 0; /* nothing to do */
2030 if (!mddev
->gendisk
|| blk_get_integrity(mddev
->gendisk
))
2031 return 0; /* shouldn't register, or already is */
2032 rdev_for_each(rdev
, mddev
) {
2033 /* skip spares and non-functional disks */
2034 if (test_bit(Faulty
, &rdev
->flags
))
2036 if (rdev
->raid_disk
< 0)
2039 /* Use the first rdev as the reference */
2043 /* does this rdev's profile match the reference profile? */
2044 if (blk_integrity_compare(reference
->bdev
->bd_disk
,
2045 rdev
->bdev
->bd_disk
) < 0)
2048 if (!reference
|| !bdev_get_integrity(reference
->bdev
))
2051 * All component devices are integrity capable and have matching
2052 * profiles, register the common profile for the md device.
2054 blk_integrity_register(mddev
->gendisk
,
2055 bdev_get_integrity(reference
->bdev
));
2057 pr_debug("md: data integrity enabled on %s\n", mdname(mddev
));
2058 if (bioset_integrity_create(mddev
->bio_set
, BIO_POOL_SIZE
)) {
2059 pr_err("md: failed to create integrity pool for %s\n",
2065 EXPORT_SYMBOL(md_integrity_register
);
2068 * Attempt to add an rdev, but only if it is consistent with the current
2071 int md_integrity_add_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
2073 struct blk_integrity
*bi_rdev
;
2074 struct blk_integrity
*bi_mddev
;
2075 char name
[BDEVNAME_SIZE
];
2077 if (!mddev
->gendisk
)
2080 bi_rdev
= bdev_get_integrity(rdev
->bdev
);
2081 bi_mddev
= blk_get_integrity(mddev
->gendisk
);
2083 if (!bi_mddev
) /* nothing to do */
2086 if (blk_integrity_compare(mddev
->gendisk
, rdev
->bdev
->bd_disk
) != 0) {
2087 pr_err("%s: incompatible integrity profile for %s\n",
2088 mdname(mddev
), bdevname(rdev
->bdev
, name
));
2094 EXPORT_SYMBOL(md_integrity_add_rdev
);
2096 static int bind_rdev_to_array(struct md_rdev
*rdev
, struct mddev
*mddev
)
2098 char b
[BDEVNAME_SIZE
];
2102 /* prevent duplicates */
2103 if (find_rdev(mddev
, rdev
->bdev
->bd_dev
))
2106 if ((bdev_read_only(rdev
->bdev
) || bdev_read_only(rdev
->meta_bdev
)) &&
2110 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2111 if (!test_bit(Journal
, &rdev
->flags
) &&
2113 (mddev
->dev_sectors
== 0 || rdev
->sectors
< mddev
->dev_sectors
)) {
2115 /* Cannot change size, so fail
2116 * If mddev->level <= 0, then we don't care
2117 * about aligning sizes (e.g. linear)
2119 if (mddev
->level
> 0)
2122 mddev
->dev_sectors
= rdev
->sectors
;
2125 /* Verify rdev->desc_nr is unique.
2126 * If it is -1, assign a free number, else
2127 * check number is not in use
2130 if (rdev
->desc_nr
< 0) {
2133 choice
= mddev
->raid_disks
;
2134 while (md_find_rdev_nr_rcu(mddev
, choice
))
2136 rdev
->desc_nr
= choice
;
2138 if (md_find_rdev_nr_rcu(mddev
, rdev
->desc_nr
)) {
2144 if (!test_bit(Journal
, &rdev
->flags
) &&
2145 mddev
->max_disks
&& rdev
->desc_nr
>= mddev
->max_disks
) {
2146 pr_warn("md: %s: array is limited to %d devices\n",
2147 mdname(mddev
), mddev
->max_disks
);
2150 bdevname(rdev
->bdev
,b
);
2151 strreplace(b
, '/', '!');
2153 rdev
->mddev
= mddev
;
2154 pr_debug("md: bind<%s>\n", b
);
2156 if ((err
= kobject_add(&rdev
->kobj
, &mddev
->kobj
, "dev-%s", b
)))
2159 ko
= &part_to_dev(rdev
->bdev
->bd_part
)->kobj
;
2160 if (sysfs_create_link(&rdev
->kobj
, ko
, "block"))
2161 /* failure here is OK */;
2162 rdev
->sysfs_state
= sysfs_get_dirent_safe(rdev
->kobj
.sd
, "state");
2164 list_add_rcu(&rdev
->same_set
, &mddev
->disks
);
2165 bd_link_disk_holder(rdev
->bdev
, mddev
->gendisk
);
2167 /* May as well allow recovery to be retried once */
2168 mddev
->recovery_disabled
++;
2173 pr_warn("md: failed to register dev-%s for %s\n",
2178 static void md_delayed_delete(struct work_struct
*ws
)
2180 struct md_rdev
*rdev
= container_of(ws
, struct md_rdev
, del_work
);
2181 kobject_del(&rdev
->kobj
);
2182 kobject_put(&rdev
->kobj
);
2185 static void unbind_rdev_from_array(struct md_rdev
*rdev
)
2187 char b
[BDEVNAME_SIZE
];
2189 bd_unlink_disk_holder(rdev
->bdev
, rdev
->mddev
->gendisk
);
2190 list_del_rcu(&rdev
->same_set
);
2191 pr_debug("md: unbind<%s>\n", bdevname(rdev
->bdev
,b
));
2193 sysfs_remove_link(&rdev
->kobj
, "block");
2194 sysfs_put(rdev
->sysfs_state
);
2195 rdev
->sysfs_state
= NULL
;
2196 rdev
->badblocks
.count
= 0;
2197 /* We need to delay this, otherwise we can deadlock when
2198 * writing to 'remove' to "dev/state". We also need
2199 * to delay it due to rcu usage.
2202 INIT_WORK(&rdev
->del_work
, md_delayed_delete
);
2203 kobject_get(&rdev
->kobj
);
2204 queue_work(md_misc_wq
, &rdev
->del_work
);
2208 * prevent the device from being mounted, repartitioned or
2209 * otherwise reused by a RAID array (or any other kernel
2210 * subsystem), by bd_claiming the device.
2212 static int lock_rdev(struct md_rdev
*rdev
, dev_t dev
, int shared
)
2215 struct block_device
*bdev
;
2216 char b
[BDEVNAME_SIZE
];
2218 bdev
= blkdev_get_by_dev(dev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
,
2219 shared
? (struct md_rdev
*)lock_rdev
: rdev
);
2221 pr_warn("md: could not open %s.\n", __bdevname(dev
, b
));
2222 return PTR_ERR(bdev
);
2228 static void unlock_rdev(struct md_rdev
*rdev
)
2230 struct block_device
*bdev
= rdev
->bdev
;
2232 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
);
2235 void md_autodetect_dev(dev_t dev
);
2237 static void export_rdev(struct md_rdev
*rdev
)
2239 char b
[BDEVNAME_SIZE
];
2241 pr_debug("md: export_rdev(%s)\n", bdevname(rdev
->bdev
,b
));
2242 md_rdev_clear(rdev
);
2244 if (test_bit(AutoDetected
, &rdev
->flags
))
2245 md_autodetect_dev(rdev
->bdev
->bd_dev
);
2248 kobject_put(&rdev
->kobj
);
2251 void md_kick_rdev_from_array(struct md_rdev
*rdev
)
2253 unbind_rdev_from_array(rdev
);
2256 EXPORT_SYMBOL_GPL(md_kick_rdev_from_array
);
2258 static void export_array(struct mddev
*mddev
)
2260 struct md_rdev
*rdev
;
2262 while (!list_empty(&mddev
->disks
)) {
2263 rdev
= list_first_entry(&mddev
->disks
, struct md_rdev
,
2265 md_kick_rdev_from_array(rdev
);
2267 mddev
->raid_disks
= 0;
2268 mddev
->major_version
= 0;
2271 static bool set_in_sync(struct mddev
*mddev
)
2273 WARN_ON_ONCE(!spin_is_locked(&mddev
->lock
));
2274 if (!mddev
->in_sync
) {
2275 mddev
->sync_checkers
++;
2276 spin_unlock(&mddev
->lock
);
2277 percpu_ref_switch_to_atomic_sync(&mddev
->writes_pending
);
2278 spin_lock(&mddev
->lock
);
2279 if (!mddev
->in_sync
&&
2280 percpu_ref_is_zero(&mddev
->writes_pending
)) {
2283 * Ensure ->in_sync is visible before we clear
2287 set_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
2288 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
2290 if (--mddev
->sync_checkers
== 0)
2291 percpu_ref_switch_to_percpu(&mddev
->writes_pending
);
2293 if (mddev
->safemode
== 1)
2294 mddev
->safemode
= 0;
2295 return mddev
->in_sync
;
2298 static void sync_sbs(struct mddev
*mddev
, int nospares
)
2300 /* Update each superblock (in-memory image), but
2301 * if we are allowed to, skip spares which already
2302 * have the right event counter, or have one earlier
2303 * (which would mean they aren't being marked as dirty
2304 * with the rest of the array)
2306 struct md_rdev
*rdev
;
2307 rdev_for_each(rdev
, mddev
) {
2308 if (rdev
->sb_events
== mddev
->events
||
2310 rdev
->raid_disk
< 0 &&
2311 rdev
->sb_events
+1 == mddev
->events
)) {
2312 /* Don't update this superblock */
2313 rdev
->sb_loaded
= 2;
2315 sync_super(mddev
, rdev
);
2316 rdev
->sb_loaded
= 1;
2321 static bool does_sb_need_changing(struct mddev
*mddev
)
2323 struct md_rdev
*rdev
;
2324 struct mdp_superblock_1
*sb
;
2327 /* Find a good rdev */
2328 rdev_for_each(rdev
, mddev
)
2329 if ((rdev
->raid_disk
>= 0) && !test_bit(Faulty
, &rdev
->flags
))
2332 /* No good device found. */
2336 sb
= page_address(rdev
->sb_page
);
2337 /* Check if a device has become faulty or a spare become active */
2338 rdev_for_each(rdev
, mddev
) {
2339 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
2340 /* Device activated? */
2341 if (role
== 0xffff && rdev
->raid_disk
>=0 &&
2342 !test_bit(Faulty
, &rdev
->flags
))
2344 /* Device turned faulty? */
2345 if (test_bit(Faulty
, &rdev
->flags
) && (role
< 0xfffd))
2349 /* Check if any mddev parameters have changed */
2350 if ((mddev
->dev_sectors
!= le64_to_cpu(sb
->size
)) ||
2351 (mddev
->reshape_position
!= le64_to_cpu(sb
->reshape_position
)) ||
2352 (mddev
->layout
!= le32_to_cpu(sb
->layout
)) ||
2353 (mddev
->raid_disks
!= le32_to_cpu(sb
->raid_disks
)) ||
2354 (mddev
->chunk_sectors
!= le32_to_cpu(sb
->chunksize
)))
2360 void md_update_sb(struct mddev
*mddev
, int force_change
)
2362 struct md_rdev
*rdev
;
2365 int any_badblocks_changed
= 0;
2370 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
2375 if (mddev_is_clustered(mddev
)) {
2376 if (test_and_clear_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
))
2378 if (test_and_clear_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
))
2380 ret
= md_cluster_ops
->metadata_update_start(mddev
);
2381 /* Has someone else has updated the sb */
2382 if (!does_sb_need_changing(mddev
)) {
2384 md_cluster_ops
->metadata_update_cancel(mddev
);
2385 bit_clear_unless(&mddev
->sb_flags
, BIT(MD_SB_CHANGE_PENDING
),
2386 BIT(MD_SB_CHANGE_DEVS
) |
2387 BIT(MD_SB_CHANGE_CLEAN
));
2392 /* First make sure individual recovery_offsets are correct */
2393 rdev_for_each(rdev
, mddev
) {
2394 if (rdev
->raid_disk
>= 0 &&
2395 mddev
->delta_disks
>= 0 &&
2396 !test_bit(Journal
, &rdev
->flags
) &&
2397 !test_bit(In_sync
, &rdev
->flags
) &&
2398 mddev
->curr_resync_completed
> rdev
->recovery_offset
)
2399 rdev
->recovery_offset
= mddev
->curr_resync_completed
;
2402 if (!mddev
->persistent
) {
2403 clear_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
2404 clear_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
2405 if (!mddev
->external
) {
2406 clear_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
2407 rdev_for_each(rdev
, mddev
) {
2408 if (rdev
->badblocks
.changed
) {
2409 rdev
->badblocks
.changed
= 0;
2410 ack_all_badblocks(&rdev
->badblocks
);
2411 md_error(mddev
, rdev
);
2413 clear_bit(Blocked
, &rdev
->flags
);
2414 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2415 wake_up(&rdev
->blocked_wait
);
2418 wake_up(&mddev
->sb_wait
);
2422 spin_lock(&mddev
->lock
);
2424 mddev
->utime
= ktime_get_real_seconds();
2426 if (test_and_clear_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
))
2428 if (test_and_clear_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
))
2429 /* just a clean<-> dirty transition, possibly leave spares alone,
2430 * though if events isn't the right even/odd, we will have to do
2436 if (mddev
->degraded
)
2437 /* If the array is degraded, then skipping spares is both
2438 * dangerous and fairly pointless.
2439 * Dangerous because a device that was removed from the array
2440 * might have a event_count that still looks up-to-date,
2441 * so it can be re-added without a resync.
2442 * Pointless because if there are any spares to skip,
2443 * then a recovery will happen and soon that array won't
2444 * be degraded any more and the spare can go back to sleep then.
2448 sync_req
= mddev
->in_sync
;
2450 /* If this is just a dirty<->clean transition, and the array is clean
2451 * and 'events' is odd, we can roll back to the previous clean state */
2453 && (mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
2454 && mddev
->can_decrease_events
2455 && mddev
->events
!= 1) {
2457 mddev
->can_decrease_events
= 0;
2459 /* otherwise we have to go forward and ... */
2461 mddev
->can_decrease_events
= nospares
;
2465 * This 64-bit counter should never wrap.
2466 * Either we are in around ~1 trillion A.C., assuming
2467 * 1 reboot per second, or we have a bug...
2469 WARN_ON(mddev
->events
== 0);
2471 rdev_for_each(rdev
, mddev
) {
2472 if (rdev
->badblocks
.changed
)
2473 any_badblocks_changed
++;
2474 if (test_bit(Faulty
, &rdev
->flags
))
2475 set_bit(FaultRecorded
, &rdev
->flags
);
2478 sync_sbs(mddev
, nospares
);
2479 spin_unlock(&mddev
->lock
);
2481 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2482 mdname(mddev
), mddev
->in_sync
);
2485 blk_add_trace_msg(mddev
->queue
, "md md_update_sb");
2487 bitmap_update_sb(mddev
->bitmap
);
2488 rdev_for_each(rdev
, mddev
) {
2489 char b
[BDEVNAME_SIZE
];
2491 if (rdev
->sb_loaded
!= 1)
2492 continue; /* no noise on spare devices */
2494 if (!test_bit(Faulty
, &rdev
->flags
)) {
2495 md_super_write(mddev
,rdev
,
2496 rdev
->sb_start
, rdev
->sb_size
,
2498 pr_debug("md: (write) %s's sb offset: %llu\n",
2499 bdevname(rdev
->bdev
, b
),
2500 (unsigned long long)rdev
->sb_start
);
2501 rdev
->sb_events
= mddev
->events
;
2502 if (rdev
->badblocks
.size
) {
2503 md_super_write(mddev
, rdev
,
2504 rdev
->badblocks
.sector
,
2505 rdev
->badblocks
.size
<< 9,
2507 rdev
->badblocks
.size
= 0;
2511 pr_debug("md: %s (skipping faulty)\n",
2512 bdevname(rdev
->bdev
, b
));
2514 if (mddev
->level
== LEVEL_MULTIPATH
)
2515 /* only need to write one superblock... */
2518 if (md_super_wait(mddev
) < 0)
2520 /* if there was a failure, MD_SB_CHANGE_DEVS was set, and we re-write super */
2522 if (mddev_is_clustered(mddev
) && ret
== 0)
2523 md_cluster_ops
->metadata_update_finish(mddev
);
2525 if (mddev
->in_sync
!= sync_req
||
2526 !bit_clear_unless(&mddev
->sb_flags
, BIT(MD_SB_CHANGE_PENDING
),
2527 BIT(MD_SB_CHANGE_DEVS
) | BIT(MD_SB_CHANGE_CLEAN
)))
2528 /* have to write it out again */
2530 wake_up(&mddev
->sb_wait
);
2531 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
2532 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
2534 rdev_for_each(rdev
, mddev
) {
2535 if (test_and_clear_bit(FaultRecorded
, &rdev
->flags
))
2536 clear_bit(Blocked
, &rdev
->flags
);
2538 if (any_badblocks_changed
)
2539 ack_all_badblocks(&rdev
->badblocks
);
2540 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2541 wake_up(&rdev
->blocked_wait
);
2544 EXPORT_SYMBOL(md_update_sb
);
2546 static int add_bound_rdev(struct md_rdev
*rdev
)
2548 struct mddev
*mddev
= rdev
->mddev
;
2550 bool add_journal
= test_bit(Journal
, &rdev
->flags
);
2552 if (!mddev
->pers
->hot_remove_disk
|| add_journal
) {
2553 /* If there is hot_add_disk but no hot_remove_disk
2554 * then added disks for geometry changes,
2555 * and should be added immediately.
2557 super_types
[mddev
->major_version
].
2558 validate_super(mddev
, rdev
);
2560 mddev_suspend(mddev
);
2561 err
= mddev
->pers
->hot_add_disk(mddev
, rdev
);
2563 mddev_resume(mddev
);
2565 md_kick_rdev_from_array(rdev
);
2569 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2571 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
2572 if (mddev
->degraded
)
2573 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
2574 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
2575 md_new_event(mddev
);
2576 md_wakeup_thread(mddev
->thread
);
2580 /* words written to sysfs files may, or may not, be \n terminated.
2581 * We want to accept with case. For this we use cmd_match.
2583 static int cmd_match(const char *cmd
, const char *str
)
2585 /* See if cmd, written into a sysfs file, matches
2586 * str. They must either be the same, or cmd can
2587 * have a trailing newline
2589 while (*cmd
&& *str
&& *cmd
== *str
) {
2600 struct rdev_sysfs_entry
{
2601 struct attribute attr
;
2602 ssize_t (*show
)(struct md_rdev
*, char *);
2603 ssize_t (*store
)(struct md_rdev
*, const char *, size_t);
2607 state_show(struct md_rdev
*rdev
, char *page
)
2611 unsigned long flags
= ACCESS_ONCE(rdev
->flags
);
2613 if (test_bit(Faulty
, &flags
) ||
2614 (!test_bit(ExternalBbl
, &flags
) &&
2615 rdev
->badblocks
.unacked_exist
))
2616 len
+= sprintf(page
+len
, "faulty%s", sep
);
2617 if (test_bit(In_sync
, &flags
))
2618 len
+= sprintf(page
+len
, "in_sync%s", sep
);
2619 if (test_bit(Journal
, &flags
))
2620 len
+= sprintf(page
+len
, "journal%s", sep
);
2621 if (test_bit(WriteMostly
, &flags
))
2622 len
+= sprintf(page
+len
, "write_mostly%s", sep
);
2623 if (test_bit(Blocked
, &flags
) ||
2624 (rdev
->badblocks
.unacked_exist
2625 && !test_bit(Faulty
, &flags
)))
2626 len
+= sprintf(page
+len
, "blocked%s", sep
);
2627 if (!test_bit(Faulty
, &flags
) &&
2628 !test_bit(Journal
, &flags
) &&
2629 !test_bit(In_sync
, &flags
))
2630 len
+= sprintf(page
+len
, "spare%s", sep
);
2631 if (test_bit(WriteErrorSeen
, &flags
))
2632 len
+= sprintf(page
+len
, "write_error%s", sep
);
2633 if (test_bit(WantReplacement
, &flags
))
2634 len
+= sprintf(page
+len
, "want_replacement%s", sep
);
2635 if (test_bit(Replacement
, &flags
))
2636 len
+= sprintf(page
+len
, "replacement%s", sep
);
2637 if (test_bit(ExternalBbl
, &flags
))
2638 len
+= sprintf(page
+len
, "external_bbl%s", sep
);
2639 if (test_bit(FailFast
, &flags
))
2640 len
+= sprintf(page
+len
, "failfast%s", sep
);
2645 return len
+sprintf(page
+len
, "\n");
2649 state_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2652 * faulty - simulates an error
2653 * remove - disconnects the device
2654 * writemostly - sets write_mostly
2655 * -writemostly - clears write_mostly
2656 * blocked - sets the Blocked flags
2657 * -blocked - clears the Blocked and possibly simulates an error
2658 * insync - sets Insync providing device isn't active
2659 * -insync - clear Insync for a device with a slot assigned,
2660 * so that it gets rebuilt based on bitmap
2661 * write_error - sets WriteErrorSeen
2662 * -write_error - clears WriteErrorSeen
2663 * {,-}failfast - set/clear FailFast
2666 if (cmd_match(buf
, "faulty") && rdev
->mddev
->pers
) {
2667 md_error(rdev
->mddev
, rdev
);
2668 if (test_bit(Faulty
, &rdev
->flags
))
2672 } else if (cmd_match(buf
, "remove")) {
2673 if (rdev
->mddev
->pers
) {
2674 clear_bit(Blocked
, &rdev
->flags
);
2675 remove_and_add_spares(rdev
->mddev
, rdev
);
2677 if (rdev
->raid_disk
>= 0)
2680 struct mddev
*mddev
= rdev
->mddev
;
2682 if (mddev_is_clustered(mddev
))
2683 err
= md_cluster_ops
->remove_disk(mddev
, rdev
);
2686 md_kick_rdev_from_array(rdev
);
2688 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
2689 md_wakeup_thread(mddev
->thread
);
2691 md_new_event(mddev
);
2694 } else if (cmd_match(buf
, "writemostly")) {
2695 set_bit(WriteMostly
, &rdev
->flags
);
2697 } else if (cmd_match(buf
, "-writemostly")) {
2698 clear_bit(WriteMostly
, &rdev
->flags
);
2700 } else if (cmd_match(buf
, "blocked")) {
2701 set_bit(Blocked
, &rdev
->flags
);
2703 } else if (cmd_match(buf
, "-blocked")) {
2704 if (!test_bit(Faulty
, &rdev
->flags
) &&
2705 !test_bit(ExternalBbl
, &rdev
->flags
) &&
2706 rdev
->badblocks
.unacked_exist
) {
2707 /* metadata handler doesn't understand badblocks,
2708 * so we need to fail the device
2710 md_error(rdev
->mddev
, rdev
);
2712 clear_bit(Blocked
, &rdev
->flags
);
2713 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2714 wake_up(&rdev
->blocked_wait
);
2715 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2716 md_wakeup_thread(rdev
->mddev
->thread
);
2719 } else if (cmd_match(buf
, "insync") && rdev
->raid_disk
== -1) {
2720 set_bit(In_sync
, &rdev
->flags
);
2722 } else if (cmd_match(buf
, "failfast")) {
2723 set_bit(FailFast
, &rdev
->flags
);
2725 } else if (cmd_match(buf
, "-failfast")) {
2726 clear_bit(FailFast
, &rdev
->flags
);
2728 } else if (cmd_match(buf
, "-insync") && rdev
->raid_disk
>= 0 &&
2729 !test_bit(Journal
, &rdev
->flags
)) {
2730 if (rdev
->mddev
->pers
== NULL
) {
2731 clear_bit(In_sync
, &rdev
->flags
);
2732 rdev
->saved_raid_disk
= rdev
->raid_disk
;
2733 rdev
->raid_disk
= -1;
2736 } else if (cmd_match(buf
, "write_error")) {
2737 set_bit(WriteErrorSeen
, &rdev
->flags
);
2739 } else if (cmd_match(buf
, "-write_error")) {
2740 clear_bit(WriteErrorSeen
, &rdev
->flags
);
2742 } else if (cmd_match(buf
, "want_replacement")) {
2743 /* Any non-spare device that is not a replacement can
2744 * become want_replacement at any time, but we then need to
2745 * check if recovery is needed.
2747 if (rdev
->raid_disk
>= 0 &&
2748 !test_bit(Journal
, &rdev
->flags
) &&
2749 !test_bit(Replacement
, &rdev
->flags
))
2750 set_bit(WantReplacement
, &rdev
->flags
);
2751 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2752 md_wakeup_thread(rdev
->mddev
->thread
);
2754 } else if (cmd_match(buf
, "-want_replacement")) {
2755 /* Clearing 'want_replacement' is always allowed.
2756 * Once replacements starts it is too late though.
2759 clear_bit(WantReplacement
, &rdev
->flags
);
2760 } else if (cmd_match(buf
, "replacement")) {
2761 /* Can only set a device as a replacement when array has not
2762 * yet been started. Once running, replacement is automatic
2763 * from spares, or by assigning 'slot'.
2765 if (rdev
->mddev
->pers
)
2768 set_bit(Replacement
, &rdev
->flags
);
2771 } else if (cmd_match(buf
, "-replacement")) {
2772 /* Similarly, can only clear Replacement before start */
2773 if (rdev
->mddev
->pers
)
2776 clear_bit(Replacement
, &rdev
->flags
);
2779 } else if (cmd_match(buf
, "re-add")) {
2780 if (test_bit(Faulty
, &rdev
->flags
) && (rdev
->raid_disk
== -1)) {
2781 /* clear_bit is performed _after_ all the devices
2782 * have their local Faulty bit cleared. If any writes
2783 * happen in the meantime in the local node, they
2784 * will land in the local bitmap, which will be synced
2785 * by this node eventually
2787 if (!mddev_is_clustered(rdev
->mddev
) ||
2788 (err
= md_cluster_ops
->gather_bitmaps(rdev
)) == 0) {
2789 clear_bit(Faulty
, &rdev
->flags
);
2790 err
= add_bound_rdev(rdev
);
2794 } else if (cmd_match(buf
, "external_bbl") && (rdev
->mddev
->external
)) {
2795 set_bit(ExternalBbl
, &rdev
->flags
);
2796 rdev
->badblocks
.shift
= 0;
2798 } else if (cmd_match(buf
, "-external_bbl") && (rdev
->mddev
->external
)) {
2799 clear_bit(ExternalBbl
, &rdev
->flags
);
2803 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2804 return err
? err
: len
;
2806 static struct rdev_sysfs_entry rdev_state
=
2807 __ATTR_PREALLOC(state
, S_IRUGO
|S_IWUSR
, state_show
, state_store
);
2810 errors_show(struct md_rdev
*rdev
, char *page
)
2812 return sprintf(page
, "%d\n", atomic_read(&rdev
->corrected_errors
));
2816 errors_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2821 rv
= kstrtouint(buf
, 10, &n
);
2824 atomic_set(&rdev
->corrected_errors
, n
);
2827 static struct rdev_sysfs_entry rdev_errors
=
2828 __ATTR(errors
, S_IRUGO
|S_IWUSR
, errors_show
, errors_store
);
2831 slot_show(struct md_rdev
*rdev
, char *page
)
2833 if (test_bit(Journal
, &rdev
->flags
))
2834 return sprintf(page
, "journal\n");
2835 else if (rdev
->raid_disk
< 0)
2836 return sprintf(page
, "none\n");
2838 return sprintf(page
, "%d\n", rdev
->raid_disk
);
2842 slot_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2847 if (test_bit(Journal
, &rdev
->flags
))
2849 if (strncmp(buf
, "none", 4)==0)
2852 err
= kstrtouint(buf
, 10, (unsigned int *)&slot
);
2856 if (rdev
->mddev
->pers
&& slot
== -1) {
2857 /* Setting 'slot' on an active array requires also
2858 * updating the 'rd%d' link, and communicating
2859 * with the personality with ->hot_*_disk.
2860 * For now we only support removing
2861 * failed/spare devices. This normally happens automatically,
2862 * but not when the metadata is externally managed.
2864 if (rdev
->raid_disk
== -1)
2866 /* personality does all needed checks */
2867 if (rdev
->mddev
->pers
->hot_remove_disk
== NULL
)
2869 clear_bit(Blocked
, &rdev
->flags
);
2870 remove_and_add_spares(rdev
->mddev
, rdev
);
2871 if (rdev
->raid_disk
>= 0)
2873 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2874 md_wakeup_thread(rdev
->mddev
->thread
);
2875 } else if (rdev
->mddev
->pers
) {
2876 /* Activating a spare .. or possibly reactivating
2877 * if we ever get bitmaps working here.
2881 if (rdev
->raid_disk
!= -1)
2884 if (test_bit(MD_RECOVERY_RUNNING
, &rdev
->mddev
->recovery
))
2887 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
2890 if (slot
>= rdev
->mddev
->raid_disks
&&
2891 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
2894 rdev
->raid_disk
= slot
;
2895 if (test_bit(In_sync
, &rdev
->flags
))
2896 rdev
->saved_raid_disk
= slot
;
2898 rdev
->saved_raid_disk
= -1;
2899 clear_bit(In_sync
, &rdev
->flags
);
2900 clear_bit(Bitmap_sync
, &rdev
->flags
);
2901 err
= rdev
->mddev
->pers
->
2902 hot_add_disk(rdev
->mddev
, rdev
);
2904 rdev
->raid_disk
= -1;
2907 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2908 if (sysfs_link_rdev(rdev
->mddev
, rdev
))
2909 /* failure here is OK */;
2910 /* don't wakeup anyone, leave that to userspace. */
2912 if (slot
>= rdev
->mddev
->raid_disks
&&
2913 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
2915 rdev
->raid_disk
= slot
;
2916 /* assume it is working */
2917 clear_bit(Faulty
, &rdev
->flags
);
2918 clear_bit(WriteMostly
, &rdev
->flags
);
2919 set_bit(In_sync
, &rdev
->flags
);
2920 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2925 static struct rdev_sysfs_entry rdev_slot
=
2926 __ATTR(slot
, S_IRUGO
|S_IWUSR
, slot_show
, slot_store
);
2929 offset_show(struct md_rdev
*rdev
, char *page
)
2931 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->data_offset
);
2935 offset_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2937 unsigned long long offset
;
2938 if (kstrtoull(buf
, 10, &offset
) < 0)
2940 if (rdev
->mddev
->pers
&& rdev
->raid_disk
>= 0)
2942 if (rdev
->sectors
&& rdev
->mddev
->external
)
2943 /* Must set offset before size, so overlap checks
2946 rdev
->data_offset
= offset
;
2947 rdev
->new_data_offset
= offset
;
2951 static struct rdev_sysfs_entry rdev_offset
=
2952 __ATTR(offset
, S_IRUGO
|S_IWUSR
, offset_show
, offset_store
);
2954 static ssize_t
new_offset_show(struct md_rdev
*rdev
, char *page
)
2956 return sprintf(page
, "%llu\n",
2957 (unsigned long long)rdev
->new_data_offset
);
2960 static ssize_t
new_offset_store(struct md_rdev
*rdev
,
2961 const char *buf
, size_t len
)
2963 unsigned long long new_offset
;
2964 struct mddev
*mddev
= rdev
->mddev
;
2966 if (kstrtoull(buf
, 10, &new_offset
) < 0)
2969 if (mddev
->sync_thread
||
2970 test_bit(MD_RECOVERY_RUNNING
,&mddev
->recovery
))
2972 if (new_offset
== rdev
->data_offset
)
2973 /* reset is always permitted */
2975 else if (new_offset
> rdev
->data_offset
) {
2976 /* must not push array size beyond rdev_sectors */
2977 if (new_offset
- rdev
->data_offset
2978 + mddev
->dev_sectors
> rdev
->sectors
)
2981 /* Metadata worries about other space details. */
2983 /* decreasing the offset is inconsistent with a backwards
2986 if (new_offset
< rdev
->data_offset
&&
2987 mddev
->reshape_backwards
)
2989 /* Increasing offset is inconsistent with forwards
2990 * reshape. reshape_direction should be set to
2991 * 'backwards' first.
2993 if (new_offset
> rdev
->data_offset
&&
2994 !mddev
->reshape_backwards
)
2997 if (mddev
->pers
&& mddev
->persistent
&&
2998 !super_types
[mddev
->major_version
]
2999 .allow_new_offset(rdev
, new_offset
))
3001 rdev
->new_data_offset
= new_offset
;
3002 if (new_offset
> rdev
->data_offset
)
3003 mddev
->reshape_backwards
= 1;
3004 else if (new_offset
< rdev
->data_offset
)
3005 mddev
->reshape_backwards
= 0;
3009 static struct rdev_sysfs_entry rdev_new_offset
=
3010 __ATTR(new_offset
, S_IRUGO
|S_IWUSR
, new_offset_show
, new_offset_store
);
3013 rdev_size_show(struct md_rdev
*rdev
, char *page
)
3015 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->sectors
/ 2);
3018 static int overlaps(sector_t s1
, sector_t l1
, sector_t s2
, sector_t l2
)
3020 /* check if two start/length pairs overlap */
3028 static int strict_blocks_to_sectors(const char *buf
, sector_t
*sectors
)
3030 unsigned long long blocks
;
3033 if (kstrtoull(buf
, 10, &blocks
) < 0)
3036 if (blocks
& 1ULL << (8 * sizeof(blocks
) - 1))
3037 return -EINVAL
; /* sector conversion overflow */
3040 if (new != blocks
* 2)
3041 return -EINVAL
; /* unsigned long long to sector_t overflow */
3048 rdev_size_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3050 struct mddev
*my_mddev
= rdev
->mddev
;
3051 sector_t oldsectors
= rdev
->sectors
;
3054 if (test_bit(Journal
, &rdev
->flags
))
3056 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
3058 if (rdev
->data_offset
!= rdev
->new_data_offset
)
3059 return -EINVAL
; /* too confusing */
3060 if (my_mddev
->pers
&& rdev
->raid_disk
>= 0) {
3061 if (my_mddev
->persistent
) {
3062 sectors
= super_types
[my_mddev
->major_version
].
3063 rdev_size_change(rdev
, sectors
);
3066 } else if (!sectors
)
3067 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) -
3069 if (!my_mddev
->pers
->resize
)
3070 /* Cannot change size for RAID0 or Linear etc */
3073 if (sectors
< my_mddev
->dev_sectors
)
3074 return -EINVAL
; /* component must fit device */
3076 rdev
->sectors
= sectors
;
3077 if (sectors
> oldsectors
&& my_mddev
->external
) {
3078 /* Need to check that all other rdevs with the same
3079 * ->bdev do not overlap. 'rcu' is sufficient to walk
3080 * the rdev lists safely.
3081 * This check does not provide a hard guarantee, it
3082 * just helps avoid dangerous mistakes.
3084 struct mddev
*mddev
;
3086 struct list_head
*tmp
;
3089 for_each_mddev(mddev
, tmp
) {
3090 struct md_rdev
*rdev2
;
3092 rdev_for_each(rdev2
, mddev
)
3093 if (rdev
->bdev
== rdev2
->bdev
&&
3095 overlaps(rdev
->data_offset
, rdev
->sectors
,
3108 /* Someone else could have slipped in a size
3109 * change here, but doing so is just silly.
3110 * We put oldsectors back because we *know* it is
3111 * safe, and trust userspace not to race with
3114 rdev
->sectors
= oldsectors
;
3121 static struct rdev_sysfs_entry rdev_size
=
3122 __ATTR(size
, S_IRUGO
|S_IWUSR
, rdev_size_show
, rdev_size_store
);
3124 static ssize_t
recovery_start_show(struct md_rdev
*rdev
, char *page
)
3126 unsigned long long recovery_start
= rdev
->recovery_offset
;
3128 if (test_bit(In_sync
, &rdev
->flags
) ||
3129 recovery_start
== MaxSector
)
3130 return sprintf(page
, "none\n");
3132 return sprintf(page
, "%llu\n", recovery_start
);
3135 static ssize_t
recovery_start_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3137 unsigned long long recovery_start
;
3139 if (cmd_match(buf
, "none"))
3140 recovery_start
= MaxSector
;
3141 else if (kstrtoull(buf
, 10, &recovery_start
))
3144 if (rdev
->mddev
->pers
&&
3145 rdev
->raid_disk
>= 0)
3148 rdev
->recovery_offset
= recovery_start
;
3149 if (recovery_start
== MaxSector
)
3150 set_bit(In_sync
, &rdev
->flags
);
3152 clear_bit(In_sync
, &rdev
->flags
);
3156 static struct rdev_sysfs_entry rdev_recovery_start
=
3157 __ATTR(recovery_start
, S_IRUGO
|S_IWUSR
, recovery_start_show
, recovery_start_store
);
3159 /* sysfs access to bad-blocks list.
3160 * We present two files.
3161 * 'bad-blocks' lists sector numbers and lengths of ranges that
3162 * are recorded as bad. The list is truncated to fit within
3163 * the one-page limit of sysfs.
3164 * Writing "sector length" to this file adds an acknowledged
3166 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
3167 * been acknowledged. Writing to this file adds bad blocks
3168 * without acknowledging them. This is largely for testing.
3170 static ssize_t
bb_show(struct md_rdev
*rdev
, char *page
)
3172 return badblocks_show(&rdev
->badblocks
, page
, 0);
3174 static ssize_t
bb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
3176 int rv
= badblocks_store(&rdev
->badblocks
, page
, len
, 0);
3177 /* Maybe that ack was all we needed */
3178 if (test_and_clear_bit(BlockedBadBlocks
, &rdev
->flags
))
3179 wake_up(&rdev
->blocked_wait
);
3182 static struct rdev_sysfs_entry rdev_bad_blocks
=
3183 __ATTR(bad_blocks
, S_IRUGO
|S_IWUSR
, bb_show
, bb_store
);
3185 static ssize_t
ubb_show(struct md_rdev
*rdev
, char *page
)
3187 return badblocks_show(&rdev
->badblocks
, page
, 1);
3189 static ssize_t
ubb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
3191 return badblocks_store(&rdev
->badblocks
, page
, len
, 1);
3193 static struct rdev_sysfs_entry rdev_unack_bad_blocks
=
3194 __ATTR(unacknowledged_bad_blocks
, S_IRUGO
|S_IWUSR
, ubb_show
, ubb_store
);
3197 ppl_sector_show(struct md_rdev
*rdev
, char *page
)
3199 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->ppl
.sector
);
3203 ppl_sector_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3205 unsigned long long sector
;
3207 if (kstrtoull(buf
, 10, §or
) < 0)
3209 if (sector
!= (sector_t
)sector
)
3212 if (rdev
->mddev
->pers
&& test_bit(MD_HAS_PPL
, &rdev
->mddev
->flags
) &&
3213 rdev
->raid_disk
>= 0)
3216 if (rdev
->mddev
->persistent
) {
3217 if (rdev
->mddev
->major_version
== 0)
3219 if ((sector
> rdev
->sb_start
&&
3220 sector
- rdev
->sb_start
> S16_MAX
) ||
3221 (sector
< rdev
->sb_start
&&
3222 rdev
->sb_start
- sector
> -S16_MIN
))
3224 rdev
->ppl
.offset
= sector
- rdev
->sb_start
;
3225 } else if (!rdev
->mddev
->external
) {
3228 rdev
->ppl
.sector
= sector
;
3232 static struct rdev_sysfs_entry rdev_ppl_sector
=
3233 __ATTR(ppl_sector
, S_IRUGO
|S_IWUSR
, ppl_sector_show
, ppl_sector_store
);
3236 ppl_size_show(struct md_rdev
*rdev
, char *page
)
3238 return sprintf(page
, "%u\n", rdev
->ppl
.size
);
3242 ppl_size_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3246 if (kstrtouint(buf
, 10, &size
) < 0)
3249 if (rdev
->mddev
->pers
&& test_bit(MD_HAS_PPL
, &rdev
->mddev
->flags
) &&
3250 rdev
->raid_disk
>= 0)
3253 if (rdev
->mddev
->persistent
) {
3254 if (rdev
->mddev
->major_version
== 0)
3258 } else if (!rdev
->mddev
->external
) {
3261 rdev
->ppl
.size
= size
;
3265 static struct rdev_sysfs_entry rdev_ppl_size
=
3266 __ATTR(ppl_size
, S_IRUGO
|S_IWUSR
, ppl_size_show
, ppl_size_store
);
3268 static struct attribute
*rdev_default_attrs
[] = {
3273 &rdev_new_offset
.attr
,
3275 &rdev_recovery_start
.attr
,
3276 &rdev_bad_blocks
.attr
,
3277 &rdev_unack_bad_blocks
.attr
,
3278 &rdev_ppl_sector
.attr
,
3279 &rdev_ppl_size
.attr
,
3283 rdev_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
3285 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
3286 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
3292 return entry
->show(rdev
, page
);
3296 rdev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
3297 const char *page
, size_t length
)
3299 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
3300 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
3302 struct mddev
*mddev
= rdev
->mddev
;
3306 if (!capable(CAP_SYS_ADMIN
))
3308 rv
= mddev
? mddev_lock(mddev
): -EBUSY
;
3310 if (rdev
->mddev
== NULL
)
3313 rv
= entry
->store(rdev
, page
, length
);
3314 mddev_unlock(mddev
);
3319 static void rdev_free(struct kobject
*ko
)
3321 struct md_rdev
*rdev
= container_of(ko
, struct md_rdev
, kobj
);
3324 static const struct sysfs_ops rdev_sysfs_ops
= {
3325 .show
= rdev_attr_show
,
3326 .store
= rdev_attr_store
,
3328 static struct kobj_type rdev_ktype
= {
3329 .release
= rdev_free
,
3330 .sysfs_ops
= &rdev_sysfs_ops
,
3331 .default_attrs
= rdev_default_attrs
,
3334 int md_rdev_init(struct md_rdev
*rdev
)
3337 rdev
->saved_raid_disk
= -1;
3338 rdev
->raid_disk
= -1;
3340 rdev
->data_offset
= 0;
3341 rdev
->new_data_offset
= 0;
3342 rdev
->sb_events
= 0;
3343 rdev
->last_read_error
= 0;
3344 rdev
->sb_loaded
= 0;
3345 rdev
->bb_page
= NULL
;
3346 atomic_set(&rdev
->nr_pending
, 0);
3347 atomic_set(&rdev
->read_errors
, 0);
3348 atomic_set(&rdev
->corrected_errors
, 0);
3350 INIT_LIST_HEAD(&rdev
->same_set
);
3351 init_waitqueue_head(&rdev
->blocked_wait
);
3353 /* Add space to store bad block list.
3354 * This reserves the space even on arrays where it cannot
3355 * be used - I wonder if that matters
3357 return badblocks_init(&rdev
->badblocks
, 0);
3359 EXPORT_SYMBOL_GPL(md_rdev_init
);
3361 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3363 * mark the device faulty if:
3365 * - the device is nonexistent (zero size)
3366 * - the device has no valid superblock
3368 * a faulty rdev _never_ has rdev->sb set.
3370 static struct md_rdev
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
3372 char b
[BDEVNAME_SIZE
];
3374 struct md_rdev
*rdev
;
3377 rdev
= kzalloc(sizeof(*rdev
), GFP_KERNEL
);
3379 return ERR_PTR(-ENOMEM
);
3381 err
= md_rdev_init(rdev
);
3384 err
= alloc_disk_sb(rdev
);
3388 err
= lock_rdev(rdev
, newdev
, super_format
== -2);
3392 kobject_init(&rdev
->kobj
, &rdev_ktype
);
3394 size
= i_size_read(rdev
->bdev
->bd_inode
) >> BLOCK_SIZE_BITS
;
3396 pr_warn("md: %s has zero or unknown size, marking faulty!\n",
3397 bdevname(rdev
->bdev
,b
));
3402 if (super_format
>= 0) {
3403 err
= super_types
[super_format
].
3404 load_super(rdev
, NULL
, super_minor
);
3405 if (err
== -EINVAL
) {
3406 pr_warn("md: %s does not have a valid v%d.%d superblock, not importing!\n",
3407 bdevname(rdev
->bdev
,b
),
3408 super_format
, super_minor
);
3412 pr_warn("md: could not read %s's sb, not importing!\n",
3413 bdevname(rdev
->bdev
,b
));
3423 md_rdev_clear(rdev
);
3425 return ERR_PTR(err
);
3429 * Check a full RAID array for plausibility
3432 static void analyze_sbs(struct mddev
*mddev
)
3435 struct md_rdev
*rdev
, *freshest
, *tmp
;
3436 char b
[BDEVNAME_SIZE
];
3439 rdev_for_each_safe(rdev
, tmp
, mddev
)
3440 switch (super_types
[mddev
->major_version
].
3441 load_super(rdev
, freshest
, mddev
->minor_version
)) {
3448 pr_warn("md: fatal superblock inconsistency in %s -- removing from array\n",
3449 bdevname(rdev
->bdev
,b
));
3450 md_kick_rdev_from_array(rdev
);
3453 super_types
[mddev
->major_version
].
3454 validate_super(mddev
, freshest
);
3457 rdev_for_each_safe(rdev
, tmp
, mddev
) {
3458 if (mddev
->max_disks
&&
3459 (rdev
->desc_nr
>= mddev
->max_disks
||
3460 i
> mddev
->max_disks
)) {
3461 pr_warn("md: %s: %s: only %d devices permitted\n",
3462 mdname(mddev
), bdevname(rdev
->bdev
, b
),
3464 md_kick_rdev_from_array(rdev
);
3467 if (rdev
!= freshest
) {
3468 if (super_types
[mddev
->major_version
].
3469 validate_super(mddev
, rdev
)) {
3470 pr_warn("md: kicking non-fresh %s from array!\n",
3471 bdevname(rdev
->bdev
,b
));
3472 md_kick_rdev_from_array(rdev
);
3476 if (mddev
->level
== LEVEL_MULTIPATH
) {
3477 rdev
->desc_nr
= i
++;
3478 rdev
->raid_disk
= rdev
->desc_nr
;
3479 set_bit(In_sync
, &rdev
->flags
);
3480 } else if (rdev
->raid_disk
>=
3481 (mddev
->raid_disks
- min(0, mddev
->delta_disks
)) &&
3482 !test_bit(Journal
, &rdev
->flags
)) {
3483 rdev
->raid_disk
= -1;
3484 clear_bit(In_sync
, &rdev
->flags
);
3489 /* Read a fixed-point number.
3490 * Numbers in sysfs attributes should be in "standard" units where
3491 * possible, so time should be in seconds.
3492 * However we internally use a a much smaller unit such as
3493 * milliseconds or jiffies.
3494 * This function takes a decimal number with a possible fractional
3495 * component, and produces an integer which is the result of
3496 * multiplying that number by 10^'scale'.
3497 * all without any floating-point arithmetic.
3499 int strict_strtoul_scaled(const char *cp
, unsigned long *res
, int scale
)
3501 unsigned long result
= 0;
3503 while (isdigit(*cp
) || (*cp
== '.' && decimals
< 0)) {
3506 else if (decimals
< scale
) {
3509 result
= result
* 10 + value
;
3521 while (decimals
< scale
) {
3530 safe_delay_show(struct mddev
*mddev
, char *page
)
3532 int msec
= (mddev
->safemode_delay
*1000)/HZ
;
3533 return sprintf(page
, "%d.%03d\n", msec
/1000, msec
%1000);
3536 safe_delay_store(struct mddev
*mddev
, const char *cbuf
, size_t len
)
3540 if (mddev_is_clustered(mddev
)) {
3541 pr_warn("md: Safemode is disabled for clustered mode\n");
3545 if (strict_strtoul_scaled(cbuf
, &msec
, 3) < 0)
3548 mddev
->safemode_delay
= 0;
3550 unsigned long old_delay
= mddev
->safemode_delay
;
3551 unsigned long new_delay
= (msec
*HZ
)/1000;
3555 mddev
->safemode_delay
= new_delay
;
3556 if (new_delay
< old_delay
|| old_delay
== 0)
3557 mod_timer(&mddev
->safemode_timer
, jiffies
+1);
3561 static struct md_sysfs_entry md_safe_delay
=
3562 __ATTR(safe_mode_delay
, S_IRUGO
|S_IWUSR
,safe_delay_show
, safe_delay_store
);
3565 level_show(struct mddev
*mddev
, char *page
)
3567 struct md_personality
*p
;
3569 spin_lock(&mddev
->lock
);
3572 ret
= sprintf(page
, "%s\n", p
->name
);
3573 else if (mddev
->clevel
[0])
3574 ret
= sprintf(page
, "%s\n", mddev
->clevel
);
3575 else if (mddev
->level
!= LEVEL_NONE
)
3576 ret
= sprintf(page
, "%d\n", mddev
->level
);
3579 spin_unlock(&mddev
->lock
);
3584 level_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3589 struct md_personality
*pers
, *oldpers
;
3591 void *priv
, *oldpriv
;
3592 struct md_rdev
*rdev
;
3594 if (slen
== 0 || slen
>= sizeof(clevel
))
3597 rv
= mddev_lock(mddev
);
3601 if (mddev
->pers
== NULL
) {
3602 strncpy(mddev
->clevel
, buf
, slen
);
3603 if (mddev
->clevel
[slen
-1] == '\n')
3605 mddev
->clevel
[slen
] = 0;
3606 mddev
->level
= LEVEL_NONE
;
3614 /* request to change the personality. Need to ensure:
3615 * - array is not engaged in resync/recovery/reshape
3616 * - old personality can be suspended
3617 * - new personality will access other array.
3621 if (mddev
->sync_thread
||
3622 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
3623 mddev
->reshape_position
!= MaxSector
||
3624 mddev
->sysfs_active
)
3628 if (!mddev
->pers
->quiesce
) {
3629 pr_warn("md: %s: %s does not support online personality change\n",
3630 mdname(mddev
), mddev
->pers
->name
);
3634 /* Now find the new personality */
3635 strncpy(clevel
, buf
, slen
);
3636 if (clevel
[slen
-1] == '\n')
3639 if (kstrtol(clevel
, 10, &level
))
3642 if (request_module("md-%s", clevel
) != 0)
3643 request_module("md-level-%s", clevel
);
3644 spin_lock(&pers_lock
);
3645 pers
= find_pers(level
, clevel
);
3646 if (!pers
|| !try_module_get(pers
->owner
)) {
3647 spin_unlock(&pers_lock
);
3648 pr_warn("md: personality %s not loaded\n", clevel
);
3652 spin_unlock(&pers_lock
);
3654 if (pers
== mddev
->pers
) {
3655 /* Nothing to do! */
3656 module_put(pers
->owner
);
3660 if (!pers
->takeover
) {
3661 module_put(pers
->owner
);
3662 pr_warn("md: %s: %s does not support personality takeover\n",
3663 mdname(mddev
), clevel
);
3668 rdev_for_each(rdev
, mddev
)
3669 rdev
->new_raid_disk
= rdev
->raid_disk
;
3671 /* ->takeover must set new_* and/or delta_disks
3672 * if it succeeds, and may set them when it fails.
3674 priv
= pers
->takeover(mddev
);
3676 mddev
->new_level
= mddev
->level
;
3677 mddev
->new_layout
= mddev
->layout
;
3678 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3679 mddev
->raid_disks
-= mddev
->delta_disks
;
3680 mddev
->delta_disks
= 0;
3681 mddev
->reshape_backwards
= 0;
3682 module_put(pers
->owner
);
3683 pr_warn("md: %s: %s would not accept array\n",
3684 mdname(mddev
), clevel
);
3689 /* Looks like we have a winner */
3690 mddev_suspend(mddev
);
3691 mddev_detach(mddev
);
3693 spin_lock(&mddev
->lock
);
3694 oldpers
= mddev
->pers
;
3695 oldpriv
= mddev
->private;
3697 mddev
->private = priv
;
3698 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
3699 mddev
->level
= mddev
->new_level
;
3700 mddev
->layout
= mddev
->new_layout
;
3701 mddev
->chunk_sectors
= mddev
->new_chunk_sectors
;
3702 mddev
->delta_disks
= 0;
3703 mddev
->reshape_backwards
= 0;
3704 mddev
->degraded
= 0;
3705 spin_unlock(&mddev
->lock
);
3707 if (oldpers
->sync_request
== NULL
&&
3709 /* We are converting from a no-redundancy array
3710 * to a redundancy array and metadata is managed
3711 * externally so we need to be sure that writes
3712 * won't block due to a need to transition
3714 * until external management is started.
3717 mddev
->safemode_delay
= 0;
3718 mddev
->safemode
= 0;
3721 oldpers
->free(mddev
, oldpriv
);
3723 if (oldpers
->sync_request
== NULL
&&
3724 pers
->sync_request
!= NULL
) {
3725 /* need to add the md_redundancy_group */
3726 if (sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
3727 pr_warn("md: cannot register extra attributes for %s\n",
3729 mddev
->sysfs_action
= sysfs_get_dirent(mddev
->kobj
.sd
, "sync_action");
3731 if (oldpers
->sync_request
!= NULL
&&
3732 pers
->sync_request
== NULL
) {
3733 /* need to remove the md_redundancy_group */
3734 if (mddev
->to_remove
== NULL
)
3735 mddev
->to_remove
= &md_redundancy_group
;
3738 module_put(oldpers
->owner
);
3740 rdev_for_each(rdev
, mddev
) {
3741 if (rdev
->raid_disk
< 0)
3743 if (rdev
->new_raid_disk
>= mddev
->raid_disks
)
3744 rdev
->new_raid_disk
= -1;
3745 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3747 sysfs_unlink_rdev(mddev
, rdev
);
3749 rdev_for_each(rdev
, mddev
) {
3750 if (rdev
->raid_disk
< 0)
3752 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3754 rdev
->raid_disk
= rdev
->new_raid_disk
;
3755 if (rdev
->raid_disk
< 0)
3756 clear_bit(In_sync
, &rdev
->flags
);
3758 if (sysfs_link_rdev(mddev
, rdev
))
3759 pr_warn("md: cannot register rd%d for %s after level change\n",
3760 rdev
->raid_disk
, mdname(mddev
));
3764 if (pers
->sync_request
== NULL
) {
3765 /* this is now an array without redundancy, so
3766 * it must always be in_sync
3769 del_timer_sync(&mddev
->safemode_timer
);
3771 blk_set_stacking_limits(&mddev
->queue
->limits
);
3773 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
3774 mddev_resume(mddev
);
3776 md_update_sb(mddev
, 1);
3777 sysfs_notify(&mddev
->kobj
, NULL
, "level");
3778 md_new_event(mddev
);
3781 mddev_unlock(mddev
);
3785 static struct md_sysfs_entry md_level
=
3786 __ATTR(level
, S_IRUGO
|S_IWUSR
, level_show
, level_store
);
3789 layout_show(struct mddev
*mddev
, char *page
)
3791 /* just a number, not meaningful for all levels */
3792 if (mddev
->reshape_position
!= MaxSector
&&
3793 mddev
->layout
!= mddev
->new_layout
)
3794 return sprintf(page
, "%d (%d)\n",
3795 mddev
->new_layout
, mddev
->layout
);
3796 return sprintf(page
, "%d\n", mddev
->layout
);
3800 layout_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3805 err
= kstrtouint(buf
, 10, &n
);
3808 err
= mddev_lock(mddev
);
3813 if (mddev
->pers
->check_reshape
== NULL
)
3818 mddev
->new_layout
= n
;
3819 err
= mddev
->pers
->check_reshape(mddev
);
3821 mddev
->new_layout
= mddev
->layout
;
3824 mddev
->new_layout
= n
;
3825 if (mddev
->reshape_position
== MaxSector
)
3828 mddev_unlock(mddev
);
3831 static struct md_sysfs_entry md_layout
=
3832 __ATTR(layout
, S_IRUGO
|S_IWUSR
, layout_show
, layout_store
);
3835 raid_disks_show(struct mddev
*mddev
, char *page
)
3837 if (mddev
->raid_disks
== 0)
3839 if (mddev
->reshape_position
!= MaxSector
&&
3840 mddev
->delta_disks
!= 0)
3841 return sprintf(page
, "%d (%d)\n", mddev
->raid_disks
,
3842 mddev
->raid_disks
- mddev
->delta_disks
);
3843 return sprintf(page
, "%d\n", mddev
->raid_disks
);
3846 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
);
3849 raid_disks_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3854 err
= kstrtouint(buf
, 10, &n
);
3858 err
= mddev_lock(mddev
);
3862 err
= update_raid_disks(mddev
, n
);
3863 else if (mddev
->reshape_position
!= MaxSector
) {
3864 struct md_rdev
*rdev
;
3865 int olddisks
= mddev
->raid_disks
- mddev
->delta_disks
;
3868 rdev_for_each(rdev
, mddev
) {
3870 rdev
->data_offset
< rdev
->new_data_offset
)
3873 rdev
->data_offset
> rdev
->new_data_offset
)
3877 mddev
->delta_disks
= n
- olddisks
;
3878 mddev
->raid_disks
= n
;
3879 mddev
->reshape_backwards
= (mddev
->delta_disks
< 0);
3881 mddev
->raid_disks
= n
;
3883 mddev_unlock(mddev
);
3884 return err
? err
: len
;
3886 static struct md_sysfs_entry md_raid_disks
=
3887 __ATTR(raid_disks
, S_IRUGO
|S_IWUSR
, raid_disks_show
, raid_disks_store
);
3890 chunk_size_show(struct mddev
*mddev
, char *page
)
3892 if (mddev
->reshape_position
!= MaxSector
&&
3893 mddev
->chunk_sectors
!= mddev
->new_chunk_sectors
)
3894 return sprintf(page
, "%d (%d)\n",
3895 mddev
->new_chunk_sectors
<< 9,
3896 mddev
->chunk_sectors
<< 9);
3897 return sprintf(page
, "%d\n", mddev
->chunk_sectors
<< 9);
3901 chunk_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3906 err
= kstrtoul(buf
, 10, &n
);
3910 err
= mddev_lock(mddev
);
3914 if (mddev
->pers
->check_reshape
== NULL
)
3919 mddev
->new_chunk_sectors
= n
>> 9;
3920 err
= mddev
->pers
->check_reshape(mddev
);
3922 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3925 mddev
->new_chunk_sectors
= n
>> 9;
3926 if (mddev
->reshape_position
== MaxSector
)
3927 mddev
->chunk_sectors
= n
>> 9;
3929 mddev_unlock(mddev
);
3932 static struct md_sysfs_entry md_chunk_size
=
3933 __ATTR(chunk_size
, S_IRUGO
|S_IWUSR
, chunk_size_show
, chunk_size_store
);
3936 resync_start_show(struct mddev
*mddev
, char *page
)
3938 if (mddev
->recovery_cp
== MaxSector
)
3939 return sprintf(page
, "none\n");
3940 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->recovery_cp
);
3944 resync_start_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3946 unsigned long long n
;
3949 if (cmd_match(buf
, "none"))
3952 err
= kstrtoull(buf
, 10, &n
);
3955 if (n
!= (sector_t
)n
)
3959 err
= mddev_lock(mddev
);
3962 if (mddev
->pers
&& !test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
3966 mddev
->recovery_cp
= n
;
3968 set_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
3970 mddev_unlock(mddev
);
3973 static struct md_sysfs_entry md_resync_start
=
3974 __ATTR_PREALLOC(resync_start
, S_IRUGO
|S_IWUSR
,
3975 resync_start_show
, resync_start_store
);
3978 * The array state can be:
3981 * No devices, no size, no level
3982 * Equivalent to STOP_ARRAY ioctl
3984 * May have some settings, but array is not active
3985 * all IO results in error
3986 * When written, doesn't tear down array, but just stops it
3987 * suspended (not supported yet)
3988 * All IO requests will block. The array can be reconfigured.
3989 * Writing this, if accepted, will block until array is quiescent
3991 * no resync can happen. no superblocks get written.
3992 * write requests fail
3994 * like readonly, but behaves like 'clean' on a write request.
3996 * clean - no pending writes, but otherwise active.
3997 * When written to inactive array, starts without resync
3998 * If a write request arrives then
3999 * if metadata is known, mark 'dirty' and switch to 'active'.
4000 * if not known, block and switch to write-pending
4001 * If written to an active array that has pending writes, then fails.
4003 * fully active: IO and resync can be happening.
4004 * When written to inactive array, starts with resync
4007 * clean, but writes are blocked waiting for 'active' to be written.
4010 * like active, but no writes have been seen for a while (100msec).
4013 enum array_state
{ clear
, inactive
, suspended
, readonly
, read_auto
, clean
, active
,
4014 write_pending
, active_idle
, bad_word
};
4015 static char *array_states
[] = {
4016 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
4017 "write-pending", "active-idle", NULL
};
4019 static int match_word(const char *word
, char **list
)
4022 for (n
=0; list
[n
]; n
++)
4023 if (cmd_match(word
, list
[n
]))
4029 array_state_show(struct mddev
*mddev
, char *page
)
4031 enum array_state st
= inactive
;
4042 spin_lock(&mddev
->lock
);
4043 if (test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
))
4045 else if (mddev
->in_sync
)
4047 else if (mddev
->safemode
)
4051 spin_unlock(&mddev
->lock
);
4054 if (list_empty(&mddev
->disks
) &&
4055 mddev
->raid_disks
== 0 &&
4056 mddev
->dev_sectors
== 0)
4061 return sprintf(page
, "%s\n", array_states
[st
]);
4064 static int do_md_stop(struct mddev
*mddev
, int ro
, struct block_device
*bdev
);
4065 static int md_set_readonly(struct mddev
*mddev
, struct block_device
*bdev
);
4066 static int do_md_run(struct mddev
*mddev
);
4067 static int restart_array(struct mddev
*mddev
);
4070 array_state_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4073 enum array_state st
= match_word(buf
, array_states
);
4075 if (mddev
->pers
&& (st
== active
|| st
== clean
) && mddev
->ro
!= 1) {
4076 /* don't take reconfig_mutex when toggling between
4079 spin_lock(&mddev
->lock
);
4081 restart_array(mddev
);
4082 clear_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
4083 md_wakeup_thread(mddev
->thread
);
4084 wake_up(&mddev
->sb_wait
);
4085 } else /* st == clean */ {
4086 restart_array(mddev
);
4087 if (!set_in_sync(mddev
))
4091 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4092 spin_unlock(&mddev
->lock
);
4095 err
= mddev_lock(mddev
);
4103 /* stopping an active array */
4104 err
= do_md_stop(mddev
, 0, NULL
);
4107 /* stopping an active array */
4109 err
= do_md_stop(mddev
, 2, NULL
);
4111 err
= 0; /* already inactive */
4114 break; /* not supported yet */
4117 err
= md_set_readonly(mddev
, NULL
);
4120 set_disk_ro(mddev
->gendisk
, 1);
4121 err
= do_md_run(mddev
);
4127 err
= md_set_readonly(mddev
, NULL
);
4128 else if (mddev
->ro
== 1)
4129 err
= restart_array(mddev
);
4132 set_disk_ro(mddev
->gendisk
, 0);
4136 err
= do_md_run(mddev
);
4141 err
= restart_array(mddev
);
4144 spin_lock(&mddev
->lock
);
4145 if (!set_in_sync(mddev
))
4147 spin_unlock(&mddev
->lock
);
4153 err
= restart_array(mddev
);
4156 clear_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
4157 wake_up(&mddev
->sb_wait
);
4161 set_disk_ro(mddev
->gendisk
, 0);
4162 err
= do_md_run(mddev
);
4167 /* these cannot be set */
4172 if (mddev
->hold_active
== UNTIL_IOCTL
)
4173 mddev
->hold_active
= 0;
4174 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4176 mddev_unlock(mddev
);
4179 static struct md_sysfs_entry md_array_state
=
4180 __ATTR_PREALLOC(array_state
, S_IRUGO
|S_IWUSR
, array_state_show
, array_state_store
);
4183 max_corrected_read_errors_show(struct mddev
*mddev
, char *page
) {
4184 return sprintf(page
, "%d\n",
4185 atomic_read(&mddev
->max_corr_read_errors
));
4189 max_corrected_read_errors_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4194 rv
= kstrtouint(buf
, 10, &n
);
4197 atomic_set(&mddev
->max_corr_read_errors
, n
);
4201 static struct md_sysfs_entry max_corr_read_errors
=
4202 __ATTR(max_read_errors
, S_IRUGO
|S_IWUSR
, max_corrected_read_errors_show
,
4203 max_corrected_read_errors_store
);
4206 null_show(struct mddev
*mddev
, char *page
)
4212 new_dev_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4214 /* buf must be %d:%d\n? giving major and minor numbers */
4215 /* The new device is added to the array.
4216 * If the array has a persistent superblock, we read the
4217 * superblock to initialise info and check validity.
4218 * Otherwise, only checking done is that in bind_rdev_to_array,
4219 * which mainly checks size.
4222 int major
= simple_strtoul(buf
, &e
, 10);
4225 struct md_rdev
*rdev
;
4228 if (!*buf
|| *e
!= ':' || !e
[1] || e
[1] == '\n')
4230 minor
= simple_strtoul(e
+1, &e
, 10);
4231 if (*e
&& *e
!= '\n')
4233 dev
= MKDEV(major
, minor
);
4234 if (major
!= MAJOR(dev
) ||
4235 minor
!= MINOR(dev
))
4238 flush_workqueue(md_misc_wq
);
4240 err
= mddev_lock(mddev
);
4243 if (mddev
->persistent
) {
4244 rdev
= md_import_device(dev
, mddev
->major_version
,
4245 mddev
->minor_version
);
4246 if (!IS_ERR(rdev
) && !list_empty(&mddev
->disks
)) {
4247 struct md_rdev
*rdev0
4248 = list_entry(mddev
->disks
.next
,
4249 struct md_rdev
, same_set
);
4250 err
= super_types
[mddev
->major_version
]
4251 .load_super(rdev
, rdev0
, mddev
->minor_version
);
4255 } else if (mddev
->external
)
4256 rdev
= md_import_device(dev
, -2, -1);
4258 rdev
= md_import_device(dev
, -1, -1);
4261 mddev_unlock(mddev
);
4262 return PTR_ERR(rdev
);
4264 err
= bind_rdev_to_array(rdev
, mddev
);
4268 mddev_unlock(mddev
);
4269 return err
? err
: len
;
4272 static struct md_sysfs_entry md_new_device
=
4273 __ATTR(new_dev
, S_IWUSR
, null_show
, new_dev_store
);
4276 bitmap_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4279 unsigned long chunk
, end_chunk
;
4282 err
= mddev_lock(mddev
);
4287 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
4289 chunk
= end_chunk
= simple_strtoul(buf
, &end
, 0);
4290 if (buf
== end
) break;
4291 if (*end
== '-') { /* range */
4293 end_chunk
= simple_strtoul(buf
, &end
, 0);
4294 if (buf
== end
) break;
4296 if (*end
&& !isspace(*end
)) break;
4297 bitmap_dirty_bits(mddev
->bitmap
, chunk
, end_chunk
);
4298 buf
= skip_spaces(end
);
4300 bitmap_unplug(mddev
->bitmap
); /* flush the bits to disk */
4302 mddev_unlock(mddev
);
4306 static struct md_sysfs_entry md_bitmap
=
4307 __ATTR(bitmap_set_bits
, S_IWUSR
, null_show
, bitmap_store
);
4310 size_show(struct mddev
*mddev
, char *page
)
4312 return sprintf(page
, "%llu\n",
4313 (unsigned long long)mddev
->dev_sectors
/ 2);
4316 static int update_size(struct mddev
*mddev
, sector_t num_sectors
);
4319 size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4321 /* If array is inactive, we can reduce the component size, but
4322 * not increase it (except from 0).
4323 * If array is active, we can try an on-line resize
4326 int err
= strict_blocks_to_sectors(buf
, §ors
);
4330 err
= mddev_lock(mddev
);
4334 err
= update_size(mddev
, sectors
);
4336 md_update_sb(mddev
, 1);
4338 if (mddev
->dev_sectors
== 0 ||
4339 mddev
->dev_sectors
> sectors
)
4340 mddev
->dev_sectors
= sectors
;
4344 mddev_unlock(mddev
);
4345 return err
? err
: len
;
4348 static struct md_sysfs_entry md_size
=
4349 __ATTR(component_size
, S_IRUGO
|S_IWUSR
, size_show
, size_store
);
4351 /* Metadata version.
4353 * 'none' for arrays with no metadata (good luck...)
4354 * 'external' for arrays with externally managed metadata,
4355 * or N.M for internally known formats
4358 metadata_show(struct mddev
*mddev
, char *page
)
4360 if (mddev
->persistent
)
4361 return sprintf(page
, "%d.%d\n",
4362 mddev
->major_version
, mddev
->minor_version
);
4363 else if (mddev
->external
)
4364 return sprintf(page
, "external:%s\n", mddev
->metadata_type
);
4366 return sprintf(page
, "none\n");
4370 metadata_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4375 /* Changing the details of 'external' metadata is
4376 * always permitted. Otherwise there must be
4377 * no devices attached to the array.
4380 err
= mddev_lock(mddev
);
4384 if (mddev
->external
&& strncmp(buf
, "external:", 9) == 0)
4386 else if (!list_empty(&mddev
->disks
))
4390 if (cmd_match(buf
, "none")) {
4391 mddev
->persistent
= 0;
4392 mddev
->external
= 0;
4393 mddev
->major_version
= 0;
4394 mddev
->minor_version
= 90;
4397 if (strncmp(buf
, "external:", 9) == 0) {
4398 size_t namelen
= len
-9;
4399 if (namelen
>= sizeof(mddev
->metadata_type
))
4400 namelen
= sizeof(mddev
->metadata_type
)-1;
4401 strncpy(mddev
->metadata_type
, buf
+9, namelen
);
4402 mddev
->metadata_type
[namelen
] = 0;
4403 if (namelen
&& mddev
->metadata_type
[namelen
-1] == '\n')
4404 mddev
->metadata_type
[--namelen
] = 0;
4405 mddev
->persistent
= 0;
4406 mddev
->external
= 1;
4407 mddev
->major_version
= 0;
4408 mddev
->minor_version
= 90;
4411 major
= simple_strtoul(buf
, &e
, 10);
4413 if (e
==buf
|| *e
!= '.')
4416 minor
= simple_strtoul(buf
, &e
, 10);
4417 if (e
==buf
|| (*e
&& *e
!= '\n') )
4420 if (major
>= ARRAY_SIZE(super_types
) || super_types
[major
].name
== NULL
)
4422 mddev
->major_version
= major
;
4423 mddev
->minor_version
= minor
;
4424 mddev
->persistent
= 1;
4425 mddev
->external
= 0;
4428 mddev_unlock(mddev
);
4432 static struct md_sysfs_entry md_metadata
=
4433 __ATTR_PREALLOC(metadata_version
, S_IRUGO
|S_IWUSR
, metadata_show
, metadata_store
);
4436 action_show(struct mddev
*mddev
, char *page
)
4438 char *type
= "idle";
4439 unsigned long recovery
= mddev
->recovery
;
4440 if (test_bit(MD_RECOVERY_FROZEN
, &recovery
))
4442 else if (test_bit(MD_RECOVERY_RUNNING
, &recovery
) ||
4443 (!mddev
->ro
&& test_bit(MD_RECOVERY_NEEDED
, &recovery
))) {
4444 if (test_bit(MD_RECOVERY_RESHAPE
, &recovery
))
4446 else if (test_bit(MD_RECOVERY_SYNC
, &recovery
)) {
4447 if (!test_bit(MD_RECOVERY_REQUESTED
, &recovery
))
4449 else if (test_bit(MD_RECOVERY_CHECK
, &recovery
))
4453 } else if (test_bit(MD_RECOVERY_RECOVER
, &recovery
))
4455 else if (mddev
->reshape_position
!= MaxSector
)
4458 return sprintf(page
, "%s\n", type
);
4462 action_store(struct mddev
*mddev
, const char *page
, size_t len
)
4464 if (!mddev
->pers
|| !mddev
->pers
->sync_request
)
4468 if (cmd_match(page
, "idle") || cmd_match(page
, "frozen")) {
4469 if (cmd_match(page
, "frozen"))
4470 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4472 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4473 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
4474 mddev_lock(mddev
) == 0) {
4475 flush_workqueue(md_misc_wq
);
4476 if (mddev
->sync_thread
) {
4477 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4478 md_reap_sync_thread(mddev
);
4480 mddev_unlock(mddev
);
4482 } else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4484 else if (cmd_match(page
, "resync"))
4485 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4486 else if (cmd_match(page
, "recover")) {
4487 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4488 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
4489 } else if (cmd_match(page
, "reshape")) {
4491 if (mddev
->pers
->start_reshape
== NULL
)
4493 err
= mddev_lock(mddev
);
4495 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4498 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4499 err
= mddev
->pers
->start_reshape(mddev
);
4501 mddev_unlock(mddev
);
4505 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
4507 if (cmd_match(page
, "check"))
4508 set_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
4509 else if (!cmd_match(page
, "repair"))
4511 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4512 set_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
4513 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
4515 if (mddev
->ro
== 2) {
4516 /* A write to sync_action is enough to justify
4517 * canceling read-auto mode
4520 md_wakeup_thread(mddev
->sync_thread
);
4522 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4523 md_wakeup_thread(mddev
->thread
);
4524 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
4528 static struct md_sysfs_entry md_scan_mode
=
4529 __ATTR_PREALLOC(sync_action
, S_IRUGO
|S_IWUSR
, action_show
, action_store
);
4532 last_sync_action_show(struct mddev
*mddev
, char *page
)
4534 return sprintf(page
, "%s\n", mddev
->last_sync_action
);
4537 static struct md_sysfs_entry md_last_scan_mode
= __ATTR_RO(last_sync_action
);
4540 mismatch_cnt_show(struct mddev
*mddev
, char *page
)
4542 return sprintf(page
, "%llu\n",
4543 (unsigned long long)
4544 atomic64_read(&mddev
->resync_mismatches
));
4547 static struct md_sysfs_entry md_mismatches
= __ATTR_RO(mismatch_cnt
);
4550 sync_min_show(struct mddev
*mddev
, char *page
)
4552 return sprintf(page
, "%d (%s)\n", speed_min(mddev
),
4553 mddev
->sync_speed_min
? "local": "system");
4557 sync_min_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4562 if (strncmp(buf
, "system", 6)==0) {
4565 rv
= kstrtouint(buf
, 10, &min
);
4571 mddev
->sync_speed_min
= min
;
4575 static struct md_sysfs_entry md_sync_min
=
4576 __ATTR(sync_speed_min
, S_IRUGO
|S_IWUSR
, sync_min_show
, sync_min_store
);
4579 sync_max_show(struct mddev
*mddev
, char *page
)
4581 return sprintf(page
, "%d (%s)\n", speed_max(mddev
),
4582 mddev
->sync_speed_max
? "local": "system");
4586 sync_max_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4591 if (strncmp(buf
, "system", 6)==0) {
4594 rv
= kstrtouint(buf
, 10, &max
);
4600 mddev
->sync_speed_max
= max
;
4604 static struct md_sysfs_entry md_sync_max
=
4605 __ATTR(sync_speed_max
, S_IRUGO
|S_IWUSR
, sync_max_show
, sync_max_store
);
4608 degraded_show(struct mddev
*mddev
, char *page
)
4610 return sprintf(page
, "%d\n", mddev
->degraded
);
4612 static struct md_sysfs_entry md_degraded
= __ATTR_RO(degraded
);
4615 sync_force_parallel_show(struct mddev
*mddev
, char *page
)
4617 return sprintf(page
, "%d\n", mddev
->parallel_resync
);
4621 sync_force_parallel_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4625 if (kstrtol(buf
, 10, &n
))
4628 if (n
!= 0 && n
!= 1)
4631 mddev
->parallel_resync
= n
;
4633 if (mddev
->sync_thread
)
4634 wake_up(&resync_wait
);
4639 /* force parallel resync, even with shared block devices */
4640 static struct md_sysfs_entry md_sync_force_parallel
=
4641 __ATTR(sync_force_parallel
, S_IRUGO
|S_IWUSR
,
4642 sync_force_parallel_show
, sync_force_parallel_store
);
4645 sync_speed_show(struct mddev
*mddev
, char *page
)
4647 unsigned long resync
, dt
, db
;
4648 if (mddev
->curr_resync
== 0)
4649 return sprintf(page
, "none\n");
4650 resync
= mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
);
4651 dt
= (jiffies
- mddev
->resync_mark
) / HZ
;
4653 db
= resync
- mddev
->resync_mark_cnt
;
4654 return sprintf(page
, "%lu\n", db
/dt
/2); /* K/sec */
4657 static struct md_sysfs_entry md_sync_speed
= __ATTR_RO(sync_speed
);
4660 sync_completed_show(struct mddev
*mddev
, char *page
)
4662 unsigned long long max_sectors
, resync
;
4664 if (!test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4665 return sprintf(page
, "none\n");
4667 if (mddev
->curr_resync
== 1 ||
4668 mddev
->curr_resync
== 2)
4669 return sprintf(page
, "delayed\n");
4671 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
4672 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
4673 max_sectors
= mddev
->resync_max_sectors
;
4675 max_sectors
= mddev
->dev_sectors
;
4677 resync
= mddev
->curr_resync_completed
;
4678 return sprintf(page
, "%llu / %llu\n", resync
, max_sectors
);
4681 static struct md_sysfs_entry md_sync_completed
=
4682 __ATTR_PREALLOC(sync_completed
, S_IRUGO
, sync_completed_show
, NULL
);
4685 min_sync_show(struct mddev
*mddev
, char *page
)
4687 return sprintf(page
, "%llu\n",
4688 (unsigned long long)mddev
->resync_min
);
4691 min_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4693 unsigned long long min
;
4696 if (kstrtoull(buf
, 10, &min
))
4699 spin_lock(&mddev
->lock
);
4701 if (min
> mddev
->resync_max
)
4705 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4708 /* Round down to multiple of 4K for safety */
4709 mddev
->resync_min
= round_down(min
, 8);
4713 spin_unlock(&mddev
->lock
);
4717 static struct md_sysfs_entry md_min_sync
=
4718 __ATTR(sync_min
, S_IRUGO
|S_IWUSR
, min_sync_show
, min_sync_store
);
4721 max_sync_show(struct mddev
*mddev
, char *page
)
4723 if (mddev
->resync_max
== MaxSector
)
4724 return sprintf(page
, "max\n");
4726 return sprintf(page
, "%llu\n",
4727 (unsigned long long)mddev
->resync_max
);
4730 max_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4733 spin_lock(&mddev
->lock
);
4734 if (strncmp(buf
, "max", 3) == 0)
4735 mddev
->resync_max
= MaxSector
;
4737 unsigned long long max
;
4741 if (kstrtoull(buf
, 10, &max
))
4743 if (max
< mddev
->resync_min
)
4747 if (max
< mddev
->resync_max
&&
4749 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4752 /* Must be a multiple of chunk_size */
4753 chunk
= mddev
->chunk_sectors
;
4755 sector_t temp
= max
;
4758 if (sector_div(temp
, chunk
))
4761 mddev
->resync_max
= max
;
4763 wake_up(&mddev
->recovery_wait
);
4766 spin_unlock(&mddev
->lock
);
4770 static struct md_sysfs_entry md_max_sync
=
4771 __ATTR(sync_max
, S_IRUGO
|S_IWUSR
, max_sync_show
, max_sync_store
);
4774 suspend_lo_show(struct mddev
*mddev
, char *page
)
4776 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_lo
);
4780 suspend_lo_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4782 unsigned long long old
, new;
4785 err
= kstrtoull(buf
, 10, &new);
4788 if (new != (sector_t
)new)
4791 err
= mddev_lock(mddev
);
4795 if (mddev
->pers
== NULL
||
4796 mddev
->pers
->quiesce
== NULL
)
4798 old
= mddev
->suspend_lo
;
4799 mddev
->suspend_lo
= new;
4801 /* Shrinking suspended region */
4802 mddev
->pers
->quiesce(mddev
, 2);
4804 /* Expanding suspended region - need to wait */
4805 mddev
->pers
->quiesce(mddev
, 1);
4806 mddev
->pers
->quiesce(mddev
, 0);
4810 mddev_unlock(mddev
);
4813 static struct md_sysfs_entry md_suspend_lo
=
4814 __ATTR(suspend_lo
, S_IRUGO
|S_IWUSR
, suspend_lo_show
, suspend_lo_store
);
4817 suspend_hi_show(struct mddev
*mddev
, char *page
)
4819 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_hi
);
4823 suspend_hi_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4825 unsigned long long old
, new;
4828 err
= kstrtoull(buf
, 10, &new);
4831 if (new != (sector_t
)new)
4834 err
= mddev_lock(mddev
);
4838 if (mddev
->pers
== NULL
||
4839 mddev
->pers
->quiesce
== NULL
)
4841 old
= mddev
->suspend_hi
;
4842 mddev
->suspend_hi
= new;
4844 /* Shrinking suspended region */
4845 mddev
->pers
->quiesce(mddev
, 2);
4847 /* Expanding suspended region - need to wait */
4848 mddev
->pers
->quiesce(mddev
, 1);
4849 mddev
->pers
->quiesce(mddev
, 0);
4853 mddev_unlock(mddev
);
4856 static struct md_sysfs_entry md_suspend_hi
=
4857 __ATTR(suspend_hi
, S_IRUGO
|S_IWUSR
, suspend_hi_show
, suspend_hi_store
);
4860 reshape_position_show(struct mddev
*mddev
, char *page
)
4862 if (mddev
->reshape_position
!= MaxSector
)
4863 return sprintf(page
, "%llu\n",
4864 (unsigned long long)mddev
->reshape_position
);
4865 strcpy(page
, "none\n");
4870 reshape_position_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4872 struct md_rdev
*rdev
;
4873 unsigned long long new;
4876 err
= kstrtoull(buf
, 10, &new);
4879 if (new != (sector_t
)new)
4881 err
= mddev_lock(mddev
);
4887 mddev
->reshape_position
= new;
4888 mddev
->delta_disks
= 0;
4889 mddev
->reshape_backwards
= 0;
4890 mddev
->new_level
= mddev
->level
;
4891 mddev
->new_layout
= mddev
->layout
;
4892 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
4893 rdev_for_each(rdev
, mddev
)
4894 rdev
->new_data_offset
= rdev
->data_offset
;
4897 mddev_unlock(mddev
);
4901 static struct md_sysfs_entry md_reshape_position
=
4902 __ATTR(reshape_position
, S_IRUGO
|S_IWUSR
, reshape_position_show
,
4903 reshape_position_store
);
4906 reshape_direction_show(struct mddev
*mddev
, char *page
)
4908 return sprintf(page
, "%s\n",
4909 mddev
->reshape_backwards
? "backwards" : "forwards");
4913 reshape_direction_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4918 if (cmd_match(buf
, "forwards"))
4920 else if (cmd_match(buf
, "backwards"))
4924 if (mddev
->reshape_backwards
== backwards
)
4927 err
= mddev_lock(mddev
);
4930 /* check if we are allowed to change */
4931 if (mddev
->delta_disks
)
4933 else if (mddev
->persistent
&&
4934 mddev
->major_version
== 0)
4937 mddev
->reshape_backwards
= backwards
;
4938 mddev_unlock(mddev
);
4942 static struct md_sysfs_entry md_reshape_direction
=
4943 __ATTR(reshape_direction
, S_IRUGO
|S_IWUSR
, reshape_direction_show
,
4944 reshape_direction_store
);
4947 array_size_show(struct mddev
*mddev
, char *page
)
4949 if (mddev
->external_size
)
4950 return sprintf(page
, "%llu\n",
4951 (unsigned long long)mddev
->array_sectors
/2);
4953 return sprintf(page
, "default\n");
4957 array_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4962 err
= mddev_lock(mddev
);
4966 /* cluster raid doesn't support change array_sectors */
4967 if (mddev_is_clustered(mddev
)) {
4968 mddev_unlock(mddev
);
4972 if (strncmp(buf
, "default", 7) == 0) {
4974 sectors
= mddev
->pers
->size(mddev
, 0, 0);
4976 sectors
= mddev
->array_sectors
;
4978 mddev
->external_size
= 0;
4980 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
4982 else if (mddev
->pers
&& mddev
->pers
->size(mddev
, 0, 0) < sectors
)
4985 mddev
->external_size
= 1;
4989 mddev
->array_sectors
= sectors
;
4991 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
4992 revalidate_disk(mddev
->gendisk
);
4995 mddev_unlock(mddev
);
4999 static struct md_sysfs_entry md_array_size
=
5000 __ATTR(array_size
, S_IRUGO
|S_IWUSR
, array_size_show
,
5004 consistency_policy_show(struct mddev
*mddev
, char *page
)
5008 if (test_bit(MD_HAS_JOURNAL
, &mddev
->flags
)) {
5009 ret
= sprintf(page
, "journal\n");
5010 } else if (test_bit(MD_HAS_PPL
, &mddev
->flags
)) {
5011 ret
= sprintf(page
, "ppl\n");
5012 } else if (mddev
->bitmap
) {
5013 ret
= sprintf(page
, "bitmap\n");
5014 } else if (mddev
->pers
) {
5015 if (mddev
->pers
->sync_request
)
5016 ret
= sprintf(page
, "resync\n");
5018 ret
= sprintf(page
, "none\n");
5020 ret
= sprintf(page
, "unknown\n");
5027 consistency_policy_store(struct mddev
*mddev
, const char *buf
, size_t len
)
5032 if (mddev
->pers
->change_consistency_policy
)
5033 err
= mddev
->pers
->change_consistency_policy(mddev
, buf
);
5036 } else if (mddev
->external
&& strncmp(buf
, "ppl", 3) == 0) {
5037 set_bit(MD_HAS_PPL
, &mddev
->flags
);
5042 return err
? err
: len
;
5045 static struct md_sysfs_entry md_consistency_policy
=
5046 __ATTR(consistency_policy
, S_IRUGO
| S_IWUSR
, consistency_policy_show
,
5047 consistency_policy_store
);
5049 static struct attribute
*md_default_attrs
[] = {
5052 &md_raid_disks
.attr
,
5053 &md_chunk_size
.attr
,
5055 &md_resync_start
.attr
,
5057 &md_new_device
.attr
,
5058 &md_safe_delay
.attr
,
5059 &md_array_state
.attr
,
5060 &md_reshape_position
.attr
,
5061 &md_reshape_direction
.attr
,
5062 &md_array_size
.attr
,
5063 &max_corr_read_errors
.attr
,
5064 &md_consistency_policy
.attr
,
5068 static struct attribute
*md_redundancy_attrs
[] = {
5070 &md_last_scan_mode
.attr
,
5071 &md_mismatches
.attr
,
5074 &md_sync_speed
.attr
,
5075 &md_sync_force_parallel
.attr
,
5076 &md_sync_completed
.attr
,
5079 &md_suspend_lo
.attr
,
5080 &md_suspend_hi
.attr
,
5085 static struct attribute_group md_redundancy_group
= {
5087 .attrs
= md_redundancy_attrs
,
5091 md_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
5093 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
5094 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
5099 spin_lock(&all_mddevs_lock
);
5100 if (list_empty(&mddev
->all_mddevs
)) {
5101 spin_unlock(&all_mddevs_lock
);
5105 spin_unlock(&all_mddevs_lock
);
5107 rv
= entry
->show(mddev
, page
);
5113 md_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
5114 const char *page
, size_t length
)
5116 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
5117 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
5122 if (!capable(CAP_SYS_ADMIN
))
5124 spin_lock(&all_mddevs_lock
);
5125 if (list_empty(&mddev
->all_mddevs
)) {
5126 spin_unlock(&all_mddevs_lock
);
5130 spin_unlock(&all_mddevs_lock
);
5131 rv
= entry
->store(mddev
, page
, length
);
5136 static void md_free(struct kobject
*ko
)
5138 struct mddev
*mddev
= container_of(ko
, struct mddev
, kobj
);
5140 if (mddev
->sysfs_state
)
5141 sysfs_put(mddev
->sysfs_state
);
5144 blk_cleanup_queue(mddev
->queue
);
5145 if (mddev
->gendisk
) {
5146 del_gendisk(mddev
->gendisk
);
5147 put_disk(mddev
->gendisk
);
5149 percpu_ref_exit(&mddev
->writes_pending
);
5154 static const struct sysfs_ops md_sysfs_ops
= {
5155 .show
= md_attr_show
,
5156 .store
= md_attr_store
,
5158 static struct kobj_type md_ktype
= {
5160 .sysfs_ops
= &md_sysfs_ops
,
5161 .default_attrs
= md_default_attrs
,
5166 static void mddev_delayed_delete(struct work_struct
*ws
)
5168 struct mddev
*mddev
= container_of(ws
, struct mddev
, del_work
);
5170 sysfs_remove_group(&mddev
->kobj
, &md_bitmap_group
);
5171 kobject_del(&mddev
->kobj
);
5172 kobject_put(&mddev
->kobj
);
5175 static void no_op(struct percpu_ref
*r
) {}
5177 int mddev_init_writes_pending(struct mddev
*mddev
)
5179 if (mddev
->writes_pending
.percpu_count_ptr
)
5181 if (percpu_ref_init(&mddev
->writes_pending
, no_op
, 0, GFP_KERNEL
) < 0)
5183 /* We want to start with the refcount at zero */
5184 percpu_ref_put(&mddev
->writes_pending
);
5187 EXPORT_SYMBOL_GPL(mddev_init_writes_pending
);
5189 static int md_alloc(dev_t dev
, char *name
)
5192 * If dev is zero, name is the name of a device to allocate with
5193 * an arbitrary minor number. It will be "md_???"
5194 * If dev is non-zero it must be a device number with a MAJOR of
5195 * MD_MAJOR or mdp_major. In this case, if "name" is NULL, then
5196 * the device is being created by opening a node in /dev.
5197 * If "name" is not NULL, the device is being created by
5198 * writing to /sys/module/md_mod/parameters/new_array.
5200 static DEFINE_MUTEX(disks_mutex
);
5201 struct mddev
*mddev
= mddev_find(dev
);
5202 struct gendisk
*disk
;
5211 partitioned
= (MAJOR(mddev
->unit
) != MD_MAJOR
);
5212 shift
= partitioned
? MdpMinorShift
: 0;
5213 unit
= MINOR(mddev
->unit
) >> shift
;
5215 /* wait for any previous instance of this device to be
5216 * completely removed (mddev_delayed_delete).
5218 flush_workqueue(md_misc_wq
);
5220 mutex_lock(&disks_mutex
);
5226 /* Need to ensure that 'name' is not a duplicate.
5228 struct mddev
*mddev2
;
5229 spin_lock(&all_mddevs_lock
);
5231 list_for_each_entry(mddev2
, &all_mddevs
, all_mddevs
)
5232 if (mddev2
->gendisk
&&
5233 strcmp(mddev2
->gendisk
->disk_name
, name
) == 0) {
5234 spin_unlock(&all_mddevs_lock
);
5237 spin_unlock(&all_mddevs_lock
);
5241 * Creating /dev/mdNNN via "newarray", so adjust hold_active.
5243 mddev
->hold_active
= UNTIL_STOP
;
5246 mddev
->queue
= blk_alloc_queue(GFP_KERNEL
);
5249 mddev
->queue
->queuedata
= mddev
;
5251 blk_queue_make_request(mddev
->queue
, md_make_request
);
5252 blk_set_stacking_limits(&mddev
->queue
->limits
);
5254 disk
= alloc_disk(1 << shift
);
5256 blk_cleanup_queue(mddev
->queue
);
5257 mddev
->queue
= NULL
;
5260 disk
->major
= MAJOR(mddev
->unit
);
5261 disk
->first_minor
= unit
<< shift
;
5263 strcpy(disk
->disk_name
, name
);
5264 else if (partitioned
)
5265 sprintf(disk
->disk_name
, "md_d%d", unit
);
5267 sprintf(disk
->disk_name
, "md%d", unit
);
5268 disk
->fops
= &md_fops
;
5269 disk
->private_data
= mddev
;
5270 disk
->queue
= mddev
->queue
;
5271 blk_queue_write_cache(mddev
->queue
, true, true);
5272 /* Allow extended partitions. This makes the
5273 * 'mdp' device redundant, but we can't really
5276 disk
->flags
|= GENHD_FL_EXT_DEVT
;
5277 mddev
->gendisk
= disk
;
5278 /* As soon as we call add_disk(), another thread could get
5279 * through to md_open, so make sure it doesn't get too far
5281 mutex_lock(&mddev
->open_mutex
);
5284 error
= kobject_init_and_add(&mddev
->kobj
, &md_ktype
,
5285 &disk_to_dev(disk
)->kobj
, "%s", "md");
5287 /* This isn't possible, but as kobject_init_and_add is marked
5288 * __must_check, we must do something with the result
5290 pr_debug("md: cannot register %s/md - name in use\n",
5294 if (mddev
->kobj
.sd
&&
5295 sysfs_create_group(&mddev
->kobj
, &md_bitmap_group
))
5296 pr_debug("pointless warning\n");
5297 mutex_unlock(&mddev
->open_mutex
);
5299 mutex_unlock(&disks_mutex
);
5300 if (!error
&& mddev
->kobj
.sd
) {
5301 kobject_uevent(&mddev
->kobj
, KOBJ_ADD
);
5302 mddev
->sysfs_state
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "array_state");
5308 static struct kobject
*md_probe(dev_t dev
, int *part
, void *data
)
5311 md_alloc(dev
, NULL
);
5315 static int add_named_array(const char *val
, struct kernel_param
*kp
)
5318 * val must be "md_*" or "mdNNN".
5319 * For "md_*" we allocate an array with a large free minor number, and
5320 * set the name to val. val must not already be an active name.
5321 * For "mdNNN" we allocate an array with the minor number NNN
5322 * which must not already be in use.
5324 int len
= strlen(val
);
5325 char buf
[DISK_NAME_LEN
];
5326 unsigned long devnum
;
5328 while (len
&& val
[len
-1] == '\n')
5330 if (len
>= DISK_NAME_LEN
)
5332 strlcpy(buf
, val
, len
+1);
5333 if (strncmp(buf
, "md_", 3) == 0)
5334 return md_alloc(0, buf
);
5335 if (strncmp(buf
, "md", 2) == 0 &&
5337 kstrtoul(buf
+2, 10, &devnum
) == 0 &&
5338 devnum
<= MINORMASK
)
5339 return md_alloc(MKDEV(MD_MAJOR
, devnum
), NULL
);
5344 static void md_safemode_timeout(unsigned long data
)
5346 struct mddev
*mddev
= (struct mddev
*) data
;
5348 mddev
->safemode
= 1;
5349 if (mddev
->external
)
5350 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5352 md_wakeup_thread(mddev
->thread
);
5355 static int start_dirty_degraded
;
5357 int md_run(struct mddev
*mddev
)
5360 struct md_rdev
*rdev
;
5361 struct md_personality
*pers
;
5363 if (list_empty(&mddev
->disks
))
5364 /* cannot run an array with no devices.. */
5369 /* Cannot run until previous stop completes properly */
5370 if (mddev
->sysfs_active
)
5374 * Analyze all RAID superblock(s)
5376 if (!mddev
->raid_disks
) {
5377 if (!mddev
->persistent
)
5382 if (mddev
->level
!= LEVEL_NONE
)
5383 request_module("md-level-%d", mddev
->level
);
5384 else if (mddev
->clevel
[0])
5385 request_module("md-%s", mddev
->clevel
);
5388 * Drop all container device buffers, from now on
5389 * the only valid external interface is through the md
5392 rdev_for_each(rdev
, mddev
) {
5393 if (test_bit(Faulty
, &rdev
->flags
))
5395 sync_blockdev(rdev
->bdev
);
5396 invalidate_bdev(rdev
->bdev
);
5397 if (mddev
->ro
!= 1 &&
5398 (bdev_read_only(rdev
->bdev
) ||
5399 bdev_read_only(rdev
->meta_bdev
))) {
5402 set_disk_ro(mddev
->gendisk
, 1);
5405 /* perform some consistency tests on the device.
5406 * We don't want the data to overlap the metadata,
5407 * Internal Bitmap issues have been handled elsewhere.
5409 if (rdev
->meta_bdev
) {
5410 /* Nothing to check */;
5411 } else if (rdev
->data_offset
< rdev
->sb_start
) {
5412 if (mddev
->dev_sectors
&&
5413 rdev
->data_offset
+ mddev
->dev_sectors
5415 pr_warn("md: %s: data overlaps metadata\n",
5420 if (rdev
->sb_start
+ rdev
->sb_size
/512
5421 > rdev
->data_offset
) {
5422 pr_warn("md: %s: metadata overlaps data\n",
5427 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
5430 if (mddev
->bio_set
== NULL
) {
5431 mddev
->bio_set
= bioset_create(BIO_POOL_SIZE
, 0);
5432 if (!mddev
->bio_set
)
5436 spin_lock(&pers_lock
);
5437 pers
= find_pers(mddev
->level
, mddev
->clevel
);
5438 if (!pers
|| !try_module_get(pers
->owner
)) {
5439 spin_unlock(&pers_lock
);
5440 if (mddev
->level
!= LEVEL_NONE
)
5441 pr_warn("md: personality for level %d is not loaded!\n",
5444 pr_warn("md: personality for level %s is not loaded!\n",
5448 spin_unlock(&pers_lock
);
5449 if (mddev
->level
!= pers
->level
) {
5450 mddev
->level
= pers
->level
;
5451 mddev
->new_level
= pers
->level
;
5453 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
5455 if (mddev
->reshape_position
!= MaxSector
&&
5456 pers
->start_reshape
== NULL
) {
5457 /* This personality cannot handle reshaping... */
5458 module_put(pers
->owner
);
5462 if (pers
->sync_request
) {
5463 /* Warn if this is a potentially silly
5466 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
5467 struct md_rdev
*rdev2
;
5470 rdev_for_each(rdev
, mddev
)
5471 rdev_for_each(rdev2
, mddev
) {
5473 rdev
->bdev
->bd_contains
==
5474 rdev2
->bdev
->bd_contains
) {
5475 pr_warn("%s: WARNING: %s appears to be on the same physical disk as %s.\n",
5477 bdevname(rdev
->bdev
,b
),
5478 bdevname(rdev2
->bdev
,b2
));
5484 pr_warn("True protection against single-disk failure might be compromised.\n");
5487 mddev
->recovery
= 0;
5488 /* may be over-ridden by personality */
5489 mddev
->resync_max_sectors
= mddev
->dev_sectors
;
5491 mddev
->ok_start_degraded
= start_dirty_degraded
;
5493 if (start_readonly
&& mddev
->ro
== 0)
5494 mddev
->ro
= 2; /* read-only, but switch on first write */
5497 * NOTE: some pers->run(), for example r5l_recovery_log(), wakes
5498 * up mddev->thread. It is important to initialize critical
5499 * resources for mddev->thread BEFORE calling pers->run().
5501 err
= pers
->run(mddev
);
5503 pr_warn("md: pers->run() failed ...\n");
5504 else if (pers
->size(mddev
, 0, 0) < mddev
->array_sectors
) {
5505 WARN_ONCE(!mddev
->external_size
,
5506 "%s: default size too small, but 'external_size' not in effect?\n",
5508 pr_warn("md: invalid array_size %llu > default size %llu\n",
5509 (unsigned long long)mddev
->array_sectors
/ 2,
5510 (unsigned long long)pers
->size(mddev
, 0, 0) / 2);
5513 if (err
== 0 && pers
->sync_request
&&
5514 (mddev
->bitmap_info
.file
|| mddev
->bitmap_info
.offset
)) {
5515 struct bitmap
*bitmap
;
5517 bitmap
= bitmap_create(mddev
, -1);
5518 if (IS_ERR(bitmap
)) {
5519 err
= PTR_ERR(bitmap
);
5520 pr_warn("%s: failed to create bitmap (%d)\n",
5521 mdname(mddev
), err
);
5523 mddev
->bitmap
= bitmap
;
5527 mddev_detach(mddev
);
5529 pers
->free(mddev
, mddev
->private);
5530 mddev
->private = NULL
;
5531 module_put(pers
->owner
);
5532 bitmap_destroy(mddev
);
5538 rdev_for_each(rdev
, mddev
) {
5539 if (rdev
->raid_disk
>= 0 &&
5540 !blk_queue_nonrot(bdev_get_queue(rdev
->bdev
))) {
5545 if (mddev
->degraded
)
5548 queue_flag_set_unlocked(QUEUE_FLAG_NONROT
, mddev
->queue
);
5550 queue_flag_clear_unlocked(QUEUE_FLAG_NONROT
, mddev
->queue
);
5551 mddev
->queue
->backing_dev_info
->congested_data
= mddev
;
5552 mddev
->queue
->backing_dev_info
->congested_fn
= md_congested
;
5554 if (pers
->sync_request
) {
5555 if (mddev
->kobj
.sd
&&
5556 sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
5557 pr_warn("md: cannot register extra attributes for %s\n",
5559 mddev
->sysfs_action
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "sync_action");
5560 } else if (mddev
->ro
== 2) /* auto-readonly not meaningful */
5563 atomic_set(&mddev
->max_corr_read_errors
,
5564 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS
);
5565 mddev
->safemode
= 0;
5566 if (mddev_is_clustered(mddev
))
5567 mddev
->safemode_delay
= 0;
5569 mddev
->safemode_delay
= (200 * HZ
)/1000 +1; /* 200 msec delay */
5572 spin_lock(&mddev
->lock
);
5574 spin_unlock(&mddev
->lock
);
5575 rdev_for_each(rdev
, mddev
)
5576 if (rdev
->raid_disk
>= 0)
5577 if (sysfs_link_rdev(mddev
, rdev
))
5578 /* failure here is OK */;
5580 if (mddev
->degraded
&& !mddev
->ro
)
5581 /* This ensures that recovering status is reported immediately
5582 * via sysfs - until a lack of spares is confirmed.
5584 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
5585 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5587 if (mddev
->sb_flags
)
5588 md_update_sb(mddev
, 0);
5590 md_new_event(mddev
);
5591 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5592 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
5593 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
5596 EXPORT_SYMBOL_GPL(md_run
);
5598 static int do_md_run(struct mddev
*mddev
)
5602 err
= md_run(mddev
);
5605 err
= bitmap_load(mddev
);
5607 bitmap_destroy(mddev
);
5611 if (mddev_is_clustered(mddev
))
5612 md_allow_write(mddev
);
5614 md_wakeup_thread(mddev
->thread
);
5615 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
5617 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
5618 revalidate_disk(mddev
->gendisk
);
5620 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
5625 static int restart_array(struct mddev
*mddev
)
5627 struct gendisk
*disk
= mddev
->gendisk
;
5628 struct md_rdev
*rdev
;
5629 bool has_journal
= false;
5630 bool has_readonly
= false;
5632 /* Complain if it has no devices */
5633 if (list_empty(&mddev
->disks
))
5641 rdev_for_each_rcu(rdev
, mddev
) {
5642 if (test_bit(Journal
, &rdev
->flags
) &&
5643 !test_bit(Faulty
, &rdev
->flags
))
5645 if (bdev_read_only(rdev
->bdev
))
5646 has_readonly
= true;
5649 if (test_bit(MD_HAS_JOURNAL
, &mddev
->flags
) && !has_journal
)
5650 /* Don't restart rw with journal missing/faulty */
5655 mddev
->safemode
= 0;
5657 set_disk_ro(disk
, 0);
5658 pr_debug("md: %s switched to read-write mode.\n", mdname(mddev
));
5659 /* Kick recovery or resync if necessary */
5660 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5661 md_wakeup_thread(mddev
->thread
);
5662 md_wakeup_thread(mddev
->sync_thread
);
5663 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5667 static void md_clean(struct mddev
*mddev
)
5669 mddev
->array_sectors
= 0;
5670 mddev
->external_size
= 0;
5671 mddev
->dev_sectors
= 0;
5672 mddev
->raid_disks
= 0;
5673 mddev
->recovery_cp
= 0;
5674 mddev
->resync_min
= 0;
5675 mddev
->resync_max
= MaxSector
;
5676 mddev
->reshape_position
= MaxSector
;
5677 mddev
->external
= 0;
5678 mddev
->persistent
= 0;
5679 mddev
->level
= LEVEL_NONE
;
5680 mddev
->clevel
[0] = 0;
5682 mddev
->sb_flags
= 0;
5684 mddev
->metadata_type
[0] = 0;
5685 mddev
->chunk_sectors
= 0;
5686 mddev
->ctime
= mddev
->utime
= 0;
5688 mddev
->max_disks
= 0;
5690 mddev
->can_decrease_events
= 0;
5691 mddev
->delta_disks
= 0;
5692 mddev
->reshape_backwards
= 0;
5693 mddev
->new_level
= LEVEL_NONE
;
5694 mddev
->new_layout
= 0;
5695 mddev
->new_chunk_sectors
= 0;
5696 mddev
->curr_resync
= 0;
5697 atomic64_set(&mddev
->resync_mismatches
, 0);
5698 mddev
->suspend_lo
= mddev
->suspend_hi
= 0;
5699 mddev
->sync_speed_min
= mddev
->sync_speed_max
= 0;
5700 mddev
->recovery
= 0;
5703 mddev
->degraded
= 0;
5704 mddev
->safemode
= 0;
5705 mddev
->private = NULL
;
5706 mddev
->cluster_info
= NULL
;
5707 mddev
->bitmap_info
.offset
= 0;
5708 mddev
->bitmap_info
.default_offset
= 0;
5709 mddev
->bitmap_info
.default_space
= 0;
5710 mddev
->bitmap_info
.chunksize
= 0;
5711 mddev
->bitmap_info
.daemon_sleep
= 0;
5712 mddev
->bitmap_info
.max_write_behind
= 0;
5713 mddev
->bitmap_info
.nodes
= 0;
5716 static void __md_stop_writes(struct mddev
*mddev
)
5718 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5719 flush_workqueue(md_misc_wq
);
5720 if (mddev
->sync_thread
) {
5721 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5722 md_reap_sync_thread(mddev
);
5725 del_timer_sync(&mddev
->safemode_timer
);
5727 if (mddev
->pers
&& mddev
->pers
->quiesce
) {
5728 mddev
->pers
->quiesce(mddev
, 1);
5729 mddev
->pers
->quiesce(mddev
, 0);
5731 bitmap_flush(mddev
);
5733 if (mddev
->ro
== 0 &&
5734 ((!mddev
->in_sync
&& !mddev_is_clustered(mddev
)) ||
5736 /* mark array as shutdown cleanly */
5737 if (!mddev_is_clustered(mddev
))
5739 md_update_sb(mddev
, 1);
5743 void md_stop_writes(struct mddev
*mddev
)
5745 mddev_lock_nointr(mddev
);
5746 __md_stop_writes(mddev
);
5747 mddev_unlock(mddev
);
5749 EXPORT_SYMBOL_GPL(md_stop_writes
);
5751 static void mddev_detach(struct mddev
*mddev
)
5753 bitmap_wait_behind_writes(mddev
);
5754 if (mddev
->pers
&& mddev
->pers
->quiesce
) {
5755 mddev
->pers
->quiesce(mddev
, 1);
5756 mddev
->pers
->quiesce(mddev
, 0);
5758 md_unregister_thread(&mddev
->thread
);
5760 blk_sync_queue(mddev
->queue
); /* the unplug fn references 'conf'*/
5763 static void __md_stop(struct mddev
*mddev
)
5765 struct md_personality
*pers
= mddev
->pers
;
5766 bitmap_destroy(mddev
);
5767 mddev_detach(mddev
);
5768 /* Ensure ->event_work is done */
5769 flush_workqueue(md_misc_wq
);
5770 spin_lock(&mddev
->lock
);
5772 spin_unlock(&mddev
->lock
);
5773 pers
->free(mddev
, mddev
->private);
5774 mddev
->private = NULL
;
5775 if (pers
->sync_request
&& mddev
->to_remove
== NULL
)
5776 mddev
->to_remove
= &md_redundancy_group
;
5777 module_put(pers
->owner
);
5778 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5781 void md_stop(struct mddev
*mddev
)
5783 /* stop the array and free an attached data structures.
5784 * This is called from dm-raid
5788 bioset_free(mddev
->bio_set
);
5791 EXPORT_SYMBOL_GPL(md_stop
);
5793 static int md_set_readonly(struct mddev
*mddev
, struct block_device
*bdev
)
5798 if (!test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
)) {
5800 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5801 md_wakeup_thread(mddev
->thread
);
5803 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
5804 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5805 if (mddev
->sync_thread
)
5806 /* Thread might be blocked waiting for metadata update
5807 * which will now never happen */
5808 wake_up_process(mddev
->sync_thread
->tsk
);
5810 if (mddev
->external
&& test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
))
5812 mddev_unlock(mddev
);
5813 wait_event(resync_wait
, !test_bit(MD_RECOVERY_RUNNING
,
5815 wait_event(mddev
->sb_wait
,
5816 !test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
));
5817 mddev_lock_nointr(mddev
);
5819 mutex_lock(&mddev
->open_mutex
);
5820 if ((mddev
->pers
&& atomic_read(&mddev
->openers
) > !!bdev
) ||
5821 mddev
->sync_thread
||
5822 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
)) {
5823 pr_warn("md: %s still in use.\n",mdname(mddev
));
5825 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5826 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5827 md_wakeup_thread(mddev
->thread
);
5833 __md_stop_writes(mddev
);
5839 set_disk_ro(mddev
->gendisk
, 1);
5840 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5841 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5842 md_wakeup_thread(mddev
->thread
);
5843 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5847 mutex_unlock(&mddev
->open_mutex
);
5852 * 0 - completely stop and dis-assemble array
5853 * 2 - stop but do not disassemble array
5855 static int do_md_stop(struct mddev
*mddev
, int mode
,
5856 struct block_device
*bdev
)
5858 struct gendisk
*disk
= mddev
->gendisk
;
5859 struct md_rdev
*rdev
;
5862 if (!test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
)) {
5864 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5865 md_wakeup_thread(mddev
->thread
);
5867 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
5868 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5869 if (mddev
->sync_thread
)
5870 /* Thread might be blocked waiting for metadata update
5871 * which will now never happen */
5872 wake_up_process(mddev
->sync_thread
->tsk
);
5874 mddev_unlock(mddev
);
5875 wait_event(resync_wait
, (mddev
->sync_thread
== NULL
&&
5876 !test_bit(MD_RECOVERY_RUNNING
,
5877 &mddev
->recovery
)));
5878 mddev_lock_nointr(mddev
);
5880 mutex_lock(&mddev
->open_mutex
);
5881 if ((mddev
->pers
&& atomic_read(&mddev
->openers
) > !!bdev
) ||
5882 mddev
->sysfs_active
||
5883 mddev
->sync_thread
||
5884 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
)) {
5885 pr_warn("md: %s still in use.\n",mdname(mddev
));
5886 mutex_unlock(&mddev
->open_mutex
);
5888 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5889 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5890 md_wakeup_thread(mddev
->thread
);
5896 set_disk_ro(disk
, 0);
5898 __md_stop_writes(mddev
);
5900 mddev
->queue
->backing_dev_info
->congested_fn
= NULL
;
5902 /* tell userspace to handle 'inactive' */
5903 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5905 rdev_for_each(rdev
, mddev
)
5906 if (rdev
->raid_disk
>= 0)
5907 sysfs_unlink_rdev(mddev
, rdev
);
5909 set_capacity(disk
, 0);
5910 mutex_unlock(&mddev
->open_mutex
);
5912 revalidate_disk(disk
);
5917 mutex_unlock(&mddev
->open_mutex
);
5919 * Free resources if final stop
5922 pr_info("md: %s stopped.\n", mdname(mddev
));
5924 if (mddev
->bitmap_info
.file
) {
5925 struct file
*f
= mddev
->bitmap_info
.file
;
5926 spin_lock(&mddev
->lock
);
5927 mddev
->bitmap_info
.file
= NULL
;
5928 spin_unlock(&mddev
->lock
);
5931 mddev
->bitmap_info
.offset
= 0;
5933 export_array(mddev
);
5936 if (mddev
->hold_active
== UNTIL_STOP
)
5937 mddev
->hold_active
= 0;
5939 md_new_event(mddev
);
5940 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5945 static void autorun_array(struct mddev
*mddev
)
5947 struct md_rdev
*rdev
;
5950 if (list_empty(&mddev
->disks
))
5953 pr_info("md: running: ");
5955 rdev_for_each(rdev
, mddev
) {
5956 char b
[BDEVNAME_SIZE
];
5957 pr_cont("<%s>", bdevname(rdev
->bdev
,b
));
5961 err
= do_md_run(mddev
);
5963 pr_warn("md: do_md_run() returned %d\n", err
);
5964 do_md_stop(mddev
, 0, NULL
);
5969 * lets try to run arrays based on all disks that have arrived
5970 * until now. (those are in pending_raid_disks)
5972 * the method: pick the first pending disk, collect all disks with
5973 * the same UUID, remove all from the pending list and put them into
5974 * the 'same_array' list. Then order this list based on superblock
5975 * update time (freshest comes first), kick out 'old' disks and
5976 * compare superblocks. If everything's fine then run it.
5978 * If "unit" is allocated, then bump its reference count
5980 static void autorun_devices(int part
)
5982 struct md_rdev
*rdev0
, *rdev
, *tmp
;
5983 struct mddev
*mddev
;
5984 char b
[BDEVNAME_SIZE
];
5986 pr_info("md: autorun ...\n");
5987 while (!list_empty(&pending_raid_disks
)) {
5990 LIST_HEAD(candidates
);
5991 rdev0
= list_entry(pending_raid_disks
.next
,
5992 struct md_rdev
, same_set
);
5994 pr_debug("md: considering %s ...\n", bdevname(rdev0
->bdev
,b
));
5995 INIT_LIST_HEAD(&candidates
);
5996 rdev_for_each_list(rdev
, tmp
, &pending_raid_disks
)
5997 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
5998 pr_debug("md: adding %s ...\n",
5999 bdevname(rdev
->bdev
,b
));
6000 list_move(&rdev
->same_set
, &candidates
);
6003 * now we have a set of devices, with all of them having
6004 * mostly sane superblocks. It's time to allocate the
6008 dev
= MKDEV(mdp_major
,
6009 rdev0
->preferred_minor
<< MdpMinorShift
);
6010 unit
= MINOR(dev
) >> MdpMinorShift
;
6012 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
6015 if (rdev0
->preferred_minor
!= unit
) {
6016 pr_warn("md: unit number in %s is bad: %d\n",
6017 bdevname(rdev0
->bdev
, b
), rdev0
->preferred_minor
);
6021 md_probe(dev
, NULL
, NULL
);
6022 mddev
= mddev_find(dev
);
6023 if (!mddev
|| !mddev
->gendisk
) {
6028 if (mddev_lock(mddev
))
6029 pr_warn("md: %s locked, cannot run\n", mdname(mddev
));
6030 else if (mddev
->raid_disks
|| mddev
->major_version
6031 || !list_empty(&mddev
->disks
)) {
6032 pr_warn("md: %s already running, cannot run %s\n",
6033 mdname(mddev
), bdevname(rdev0
->bdev
,b
));
6034 mddev_unlock(mddev
);
6036 pr_debug("md: created %s\n", mdname(mddev
));
6037 mddev
->persistent
= 1;
6038 rdev_for_each_list(rdev
, tmp
, &candidates
) {
6039 list_del_init(&rdev
->same_set
);
6040 if (bind_rdev_to_array(rdev
, mddev
))
6043 autorun_array(mddev
);
6044 mddev_unlock(mddev
);
6046 /* on success, candidates will be empty, on error
6049 rdev_for_each_list(rdev
, tmp
, &candidates
) {
6050 list_del_init(&rdev
->same_set
);
6055 pr_info("md: ... autorun DONE.\n");
6057 #endif /* !MODULE */
6059 static int get_version(void __user
*arg
)
6063 ver
.major
= MD_MAJOR_VERSION
;
6064 ver
.minor
= MD_MINOR_VERSION
;
6065 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
6067 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
6073 static int get_array_info(struct mddev
*mddev
, void __user
*arg
)
6075 mdu_array_info_t info
;
6076 int nr
,working
,insync
,failed
,spare
;
6077 struct md_rdev
*rdev
;
6079 nr
= working
= insync
= failed
= spare
= 0;
6081 rdev_for_each_rcu(rdev
, mddev
) {
6083 if (test_bit(Faulty
, &rdev
->flags
))
6087 if (test_bit(In_sync
, &rdev
->flags
))
6089 else if (test_bit(Journal
, &rdev
->flags
))
6090 /* TODO: add journal count to md_u.h */
6098 info
.major_version
= mddev
->major_version
;
6099 info
.minor_version
= mddev
->minor_version
;
6100 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
6101 info
.ctime
= clamp_t(time64_t
, mddev
->ctime
, 0, U32_MAX
);
6102 info
.level
= mddev
->level
;
6103 info
.size
= mddev
->dev_sectors
/ 2;
6104 if (info
.size
!= mddev
->dev_sectors
/ 2) /* overflow */
6107 info
.raid_disks
= mddev
->raid_disks
;
6108 info
.md_minor
= mddev
->md_minor
;
6109 info
.not_persistent
= !mddev
->persistent
;
6111 info
.utime
= clamp_t(time64_t
, mddev
->utime
, 0, U32_MAX
);
6114 info
.state
= (1<<MD_SB_CLEAN
);
6115 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
6116 info
.state
|= (1<<MD_SB_BITMAP_PRESENT
);
6117 if (mddev_is_clustered(mddev
))
6118 info
.state
|= (1<<MD_SB_CLUSTERED
);
6119 info
.active_disks
= insync
;
6120 info
.working_disks
= working
;
6121 info
.failed_disks
= failed
;
6122 info
.spare_disks
= spare
;
6124 info
.layout
= mddev
->layout
;
6125 info
.chunk_size
= mddev
->chunk_sectors
<< 9;
6127 if (copy_to_user(arg
, &info
, sizeof(info
)))
6133 static int get_bitmap_file(struct mddev
*mddev
, void __user
* arg
)
6135 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
6139 file
= kzalloc(sizeof(*file
), GFP_NOIO
);
6144 spin_lock(&mddev
->lock
);
6145 /* bitmap enabled */
6146 if (mddev
->bitmap_info
.file
) {
6147 ptr
= file_path(mddev
->bitmap_info
.file
, file
->pathname
,
6148 sizeof(file
->pathname
));
6152 memmove(file
->pathname
, ptr
,
6153 sizeof(file
->pathname
)-(ptr
-file
->pathname
));
6155 spin_unlock(&mddev
->lock
);
6158 copy_to_user(arg
, file
, sizeof(*file
)))
6165 static int get_disk_info(struct mddev
*mddev
, void __user
* arg
)
6167 mdu_disk_info_t info
;
6168 struct md_rdev
*rdev
;
6170 if (copy_from_user(&info
, arg
, sizeof(info
)))
6174 rdev
= md_find_rdev_nr_rcu(mddev
, info
.number
);
6176 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
6177 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
6178 info
.raid_disk
= rdev
->raid_disk
;
6180 if (test_bit(Faulty
, &rdev
->flags
))
6181 info
.state
|= (1<<MD_DISK_FAULTY
);
6182 else if (test_bit(In_sync
, &rdev
->flags
)) {
6183 info
.state
|= (1<<MD_DISK_ACTIVE
);
6184 info
.state
|= (1<<MD_DISK_SYNC
);
6186 if (test_bit(Journal
, &rdev
->flags
))
6187 info
.state
|= (1<<MD_DISK_JOURNAL
);
6188 if (test_bit(WriteMostly
, &rdev
->flags
))
6189 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
6190 if (test_bit(FailFast
, &rdev
->flags
))
6191 info
.state
|= (1<<MD_DISK_FAILFAST
);
6193 info
.major
= info
.minor
= 0;
6194 info
.raid_disk
= -1;
6195 info
.state
= (1<<MD_DISK_REMOVED
);
6199 if (copy_to_user(arg
, &info
, sizeof(info
)))
6205 static int add_new_disk(struct mddev
*mddev
, mdu_disk_info_t
*info
)
6207 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
6208 struct md_rdev
*rdev
;
6209 dev_t dev
= MKDEV(info
->major
,info
->minor
);
6211 if (mddev_is_clustered(mddev
) &&
6212 !(info
->state
& ((1 << MD_DISK_CLUSTER_ADD
) | (1 << MD_DISK_CANDIDATE
)))) {
6213 pr_warn("%s: Cannot add to clustered mddev.\n",
6218 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
6221 if (!mddev
->raid_disks
) {
6223 /* expecting a device which has a superblock */
6224 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
6226 pr_warn("md: md_import_device returned %ld\n",
6228 return PTR_ERR(rdev
);
6230 if (!list_empty(&mddev
->disks
)) {
6231 struct md_rdev
*rdev0
6232 = list_entry(mddev
->disks
.next
,
6233 struct md_rdev
, same_set
);
6234 err
= super_types
[mddev
->major_version
]
6235 .load_super(rdev
, rdev0
, mddev
->minor_version
);
6237 pr_warn("md: %s has different UUID to %s\n",
6238 bdevname(rdev
->bdev
,b
),
6239 bdevname(rdev0
->bdev
,b2
));
6244 err
= bind_rdev_to_array(rdev
, mddev
);
6251 * add_new_disk can be used once the array is assembled
6252 * to add "hot spares". They must already have a superblock
6257 if (!mddev
->pers
->hot_add_disk
) {
6258 pr_warn("%s: personality does not support diskops!\n",
6262 if (mddev
->persistent
)
6263 rdev
= md_import_device(dev
, mddev
->major_version
,
6264 mddev
->minor_version
);
6266 rdev
= md_import_device(dev
, -1, -1);
6268 pr_warn("md: md_import_device returned %ld\n",
6270 return PTR_ERR(rdev
);
6272 /* set saved_raid_disk if appropriate */
6273 if (!mddev
->persistent
) {
6274 if (info
->state
& (1<<MD_DISK_SYNC
) &&
6275 info
->raid_disk
< mddev
->raid_disks
) {
6276 rdev
->raid_disk
= info
->raid_disk
;
6277 set_bit(In_sync
, &rdev
->flags
);
6278 clear_bit(Bitmap_sync
, &rdev
->flags
);
6280 rdev
->raid_disk
= -1;
6281 rdev
->saved_raid_disk
= rdev
->raid_disk
;
6283 super_types
[mddev
->major_version
].
6284 validate_super(mddev
, rdev
);
6285 if ((info
->state
& (1<<MD_DISK_SYNC
)) &&
6286 rdev
->raid_disk
!= info
->raid_disk
) {
6287 /* This was a hot-add request, but events doesn't
6288 * match, so reject it.
6294 clear_bit(In_sync
, &rdev
->flags
); /* just to be sure */
6295 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
6296 set_bit(WriteMostly
, &rdev
->flags
);
6298 clear_bit(WriteMostly
, &rdev
->flags
);
6299 if (info
->state
& (1<<MD_DISK_FAILFAST
))
6300 set_bit(FailFast
, &rdev
->flags
);
6302 clear_bit(FailFast
, &rdev
->flags
);
6304 if (info
->state
& (1<<MD_DISK_JOURNAL
)) {
6305 struct md_rdev
*rdev2
;
6306 bool has_journal
= false;
6308 /* make sure no existing journal disk */
6309 rdev_for_each(rdev2
, mddev
) {
6310 if (test_bit(Journal
, &rdev2
->flags
)) {
6319 set_bit(Journal
, &rdev
->flags
);
6322 * check whether the device shows up in other nodes
6324 if (mddev_is_clustered(mddev
)) {
6325 if (info
->state
& (1 << MD_DISK_CANDIDATE
))
6326 set_bit(Candidate
, &rdev
->flags
);
6327 else if (info
->state
& (1 << MD_DISK_CLUSTER_ADD
)) {
6328 /* --add initiated by this node */
6329 err
= md_cluster_ops
->add_new_disk(mddev
, rdev
);
6337 rdev
->raid_disk
= -1;
6338 err
= bind_rdev_to_array(rdev
, mddev
);
6343 if (mddev_is_clustered(mddev
)) {
6344 if (info
->state
& (1 << MD_DISK_CANDIDATE
)) {
6346 err
= md_cluster_ops
->new_disk_ack(mddev
,
6349 md_kick_rdev_from_array(rdev
);
6353 md_cluster_ops
->add_new_disk_cancel(mddev
);
6355 err
= add_bound_rdev(rdev
);
6359 err
= add_bound_rdev(rdev
);
6364 /* otherwise, add_new_disk is only allowed
6365 * for major_version==0 superblocks
6367 if (mddev
->major_version
!= 0) {
6368 pr_warn("%s: ADD_NEW_DISK not supported\n", mdname(mddev
));
6372 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
6374 rdev
= md_import_device(dev
, -1, 0);
6376 pr_warn("md: error, md_import_device() returned %ld\n",
6378 return PTR_ERR(rdev
);
6380 rdev
->desc_nr
= info
->number
;
6381 if (info
->raid_disk
< mddev
->raid_disks
)
6382 rdev
->raid_disk
= info
->raid_disk
;
6384 rdev
->raid_disk
= -1;
6386 if (rdev
->raid_disk
< mddev
->raid_disks
)
6387 if (info
->state
& (1<<MD_DISK_SYNC
))
6388 set_bit(In_sync
, &rdev
->flags
);
6390 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
6391 set_bit(WriteMostly
, &rdev
->flags
);
6392 if (info
->state
& (1<<MD_DISK_FAILFAST
))
6393 set_bit(FailFast
, &rdev
->flags
);
6395 if (!mddev
->persistent
) {
6396 pr_debug("md: nonpersistent superblock ...\n");
6397 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
6399 rdev
->sb_start
= calc_dev_sboffset(rdev
);
6400 rdev
->sectors
= rdev
->sb_start
;
6402 err
= bind_rdev_to_array(rdev
, mddev
);
6412 static int hot_remove_disk(struct mddev
*mddev
, dev_t dev
)
6414 char b
[BDEVNAME_SIZE
];
6415 struct md_rdev
*rdev
;
6417 rdev
= find_rdev(mddev
, dev
);
6421 if (rdev
->raid_disk
< 0)
6424 clear_bit(Blocked
, &rdev
->flags
);
6425 remove_and_add_spares(mddev
, rdev
);
6427 if (rdev
->raid_disk
>= 0)
6431 if (mddev_is_clustered(mddev
))
6432 md_cluster_ops
->remove_disk(mddev
, rdev
);
6434 md_kick_rdev_from_array(rdev
);
6435 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
6437 md_wakeup_thread(mddev
->thread
);
6439 md_update_sb(mddev
, 1);
6440 md_new_event(mddev
);
6444 pr_debug("md: cannot remove active disk %s from %s ...\n",
6445 bdevname(rdev
->bdev
,b
), mdname(mddev
));
6449 static int hot_add_disk(struct mddev
*mddev
, dev_t dev
)
6451 char b
[BDEVNAME_SIZE
];
6453 struct md_rdev
*rdev
;
6458 if (mddev
->major_version
!= 0) {
6459 pr_warn("%s: HOT_ADD may only be used with version-0 superblocks.\n",
6463 if (!mddev
->pers
->hot_add_disk
) {
6464 pr_warn("%s: personality does not support diskops!\n",
6469 rdev
= md_import_device(dev
, -1, 0);
6471 pr_warn("md: error, md_import_device() returned %ld\n",
6476 if (mddev
->persistent
)
6477 rdev
->sb_start
= calc_dev_sboffset(rdev
);
6479 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
6481 rdev
->sectors
= rdev
->sb_start
;
6483 if (test_bit(Faulty
, &rdev
->flags
)) {
6484 pr_warn("md: can not hot-add faulty %s disk to %s!\n",
6485 bdevname(rdev
->bdev
,b
), mdname(mddev
));
6490 clear_bit(In_sync
, &rdev
->flags
);
6492 rdev
->saved_raid_disk
= -1;
6493 err
= bind_rdev_to_array(rdev
, mddev
);
6498 * The rest should better be atomic, we can have disk failures
6499 * noticed in interrupt contexts ...
6502 rdev
->raid_disk
= -1;
6504 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
6506 md_update_sb(mddev
, 1);
6508 * Kick recovery, maybe this spare has to be added to the
6509 * array immediately.
6511 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6512 md_wakeup_thread(mddev
->thread
);
6513 md_new_event(mddev
);
6521 static int set_bitmap_file(struct mddev
*mddev
, int fd
)
6526 if (!mddev
->pers
->quiesce
|| !mddev
->thread
)
6528 if (mddev
->recovery
|| mddev
->sync_thread
)
6530 /* we should be able to change the bitmap.. */
6534 struct inode
*inode
;
6537 if (mddev
->bitmap
|| mddev
->bitmap_info
.file
)
6538 return -EEXIST
; /* cannot add when bitmap is present */
6542 pr_warn("%s: error: failed to get bitmap file\n",
6547 inode
= f
->f_mapping
->host
;
6548 if (!S_ISREG(inode
->i_mode
)) {
6549 pr_warn("%s: error: bitmap file must be a regular file\n",
6552 } else if (!(f
->f_mode
& FMODE_WRITE
)) {
6553 pr_warn("%s: error: bitmap file must open for write\n",
6556 } else if (atomic_read(&inode
->i_writecount
) != 1) {
6557 pr_warn("%s: error: bitmap file is already in use\n",
6565 mddev
->bitmap_info
.file
= f
;
6566 mddev
->bitmap_info
.offset
= 0; /* file overrides offset */
6567 } else if (mddev
->bitmap
== NULL
)
6568 return -ENOENT
; /* cannot remove what isn't there */
6571 mddev
->pers
->quiesce(mddev
, 1);
6573 struct bitmap
*bitmap
;
6575 bitmap
= bitmap_create(mddev
, -1);
6576 if (!IS_ERR(bitmap
)) {
6577 mddev
->bitmap
= bitmap
;
6578 err
= bitmap_load(mddev
);
6580 err
= PTR_ERR(bitmap
);
6582 if (fd
< 0 || err
) {
6583 bitmap_destroy(mddev
);
6584 fd
= -1; /* make sure to put the file */
6586 mddev
->pers
->quiesce(mddev
, 0);
6589 struct file
*f
= mddev
->bitmap_info
.file
;
6591 spin_lock(&mddev
->lock
);
6592 mddev
->bitmap_info
.file
= NULL
;
6593 spin_unlock(&mddev
->lock
);
6602 * set_array_info is used two different ways
6603 * The original usage is when creating a new array.
6604 * In this usage, raid_disks is > 0 and it together with
6605 * level, size, not_persistent,layout,chunksize determine the
6606 * shape of the array.
6607 * This will always create an array with a type-0.90.0 superblock.
6608 * The newer usage is when assembling an array.
6609 * In this case raid_disks will be 0, and the major_version field is
6610 * use to determine which style super-blocks are to be found on the devices.
6611 * The minor and patch _version numbers are also kept incase the
6612 * super_block handler wishes to interpret them.
6614 static int set_array_info(struct mddev
*mddev
, mdu_array_info_t
*info
)
6617 if (info
->raid_disks
== 0) {
6618 /* just setting version number for superblock loading */
6619 if (info
->major_version
< 0 ||
6620 info
->major_version
>= ARRAY_SIZE(super_types
) ||
6621 super_types
[info
->major_version
].name
== NULL
) {
6622 /* maybe try to auto-load a module? */
6623 pr_warn("md: superblock version %d not known\n",
6624 info
->major_version
);
6627 mddev
->major_version
= info
->major_version
;
6628 mddev
->minor_version
= info
->minor_version
;
6629 mddev
->patch_version
= info
->patch_version
;
6630 mddev
->persistent
= !info
->not_persistent
;
6631 /* ensure mddev_put doesn't delete this now that there
6632 * is some minimal configuration.
6634 mddev
->ctime
= ktime_get_real_seconds();
6637 mddev
->major_version
= MD_MAJOR_VERSION
;
6638 mddev
->minor_version
= MD_MINOR_VERSION
;
6639 mddev
->patch_version
= MD_PATCHLEVEL_VERSION
;
6640 mddev
->ctime
= ktime_get_real_seconds();
6642 mddev
->level
= info
->level
;
6643 mddev
->clevel
[0] = 0;
6644 mddev
->dev_sectors
= 2 * (sector_t
)info
->size
;
6645 mddev
->raid_disks
= info
->raid_disks
;
6646 /* don't set md_minor, it is determined by which /dev/md* was
6649 if (info
->state
& (1<<MD_SB_CLEAN
))
6650 mddev
->recovery_cp
= MaxSector
;
6652 mddev
->recovery_cp
= 0;
6653 mddev
->persistent
= ! info
->not_persistent
;
6654 mddev
->external
= 0;
6656 mddev
->layout
= info
->layout
;
6657 mddev
->chunk_sectors
= info
->chunk_size
>> 9;
6659 if (mddev
->persistent
) {
6660 mddev
->max_disks
= MD_SB_DISKS
;
6662 mddev
->sb_flags
= 0;
6664 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
6666 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
6667 mddev
->bitmap_info
.default_space
= 64*2 - (MD_SB_BYTES
>> 9);
6668 mddev
->bitmap_info
.offset
= 0;
6670 mddev
->reshape_position
= MaxSector
;
6673 * Generate a 128 bit UUID
6675 get_random_bytes(mddev
->uuid
, 16);
6677 mddev
->new_level
= mddev
->level
;
6678 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
6679 mddev
->new_layout
= mddev
->layout
;
6680 mddev
->delta_disks
= 0;
6681 mddev
->reshape_backwards
= 0;
6686 void md_set_array_sectors(struct mddev
*mddev
, sector_t array_sectors
)
6688 WARN(!mddev_is_locked(mddev
), "%s: unlocked mddev!\n", __func__
);
6690 if (mddev
->external_size
)
6693 mddev
->array_sectors
= array_sectors
;
6695 EXPORT_SYMBOL(md_set_array_sectors
);
6697 static int update_size(struct mddev
*mddev
, sector_t num_sectors
)
6699 struct md_rdev
*rdev
;
6701 int fit
= (num_sectors
== 0);
6702 sector_t old_dev_sectors
= mddev
->dev_sectors
;
6704 if (mddev
->pers
->resize
== NULL
)
6706 /* The "num_sectors" is the number of sectors of each device that
6707 * is used. This can only make sense for arrays with redundancy.
6708 * linear and raid0 always use whatever space is available. We can only
6709 * consider changing this number if no resync or reconstruction is
6710 * happening, and if the new size is acceptable. It must fit before the
6711 * sb_start or, if that is <data_offset, it must fit before the size
6712 * of each device. If num_sectors is zero, we find the largest size
6715 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
6721 rdev_for_each(rdev
, mddev
) {
6722 sector_t avail
= rdev
->sectors
;
6724 if (fit
&& (num_sectors
== 0 || num_sectors
> avail
))
6725 num_sectors
= avail
;
6726 if (avail
< num_sectors
)
6729 rv
= mddev
->pers
->resize(mddev
, num_sectors
);
6731 if (mddev_is_clustered(mddev
))
6732 md_cluster_ops
->update_size(mddev
, old_dev_sectors
);
6733 else if (mddev
->queue
) {
6734 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
6735 revalidate_disk(mddev
->gendisk
);
6741 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
)
6744 struct md_rdev
*rdev
;
6745 /* change the number of raid disks */
6746 if (mddev
->pers
->check_reshape
== NULL
)
6750 if (raid_disks
<= 0 ||
6751 (mddev
->max_disks
&& raid_disks
>= mddev
->max_disks
))
6753 if (mddev
->sync_thread
||
6754 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
6755 mddev
->reshape_position
!= MaxSector
)
6758 rdev_for_each(rdev
, mddev
) {
6759 if (mddev
->raid_disks
< raid_disks
&&
6760 rdev
->data_offset
< rdev
->new_data_offset
)
6762 if (mddev
->raid_disks
> raid_disks
&&
6763 rdev
->data_offset
> rdev
->new_data_offset
)
6767 mddev
->delta_disks
= raid_disks
- mddev
->raid_disks
;
6768 if (mddev
->delta_disks
< 0)
6769 mddev
->reshape_backwards
= 1;
6770 else if (mddev
->delta_disks
> 0)
6771 mddev
->reshape_backwards
= 0;
6773 rv
= mddev
->pers
->check_reshape(mddev
);
6775 mddev
->delta_disks
= 0;
6776 mddev
->reshape_backwards
= 0;
6782 * update_array_info is used to change the configuration of an
6784 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
6785 * fields in the info are checked against the array.
6786 * Any differences that cannot be handled will cause an error.
6787 * Normally, only one change can be managed at a time.
6789 static int update_array_info(struct mddev
*mddev
, mdu_array_info_t
*info
)
6795 /* calculate expected state,ignoring low bits */
6796 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
6797 state
|= (1 << MD_SB_BITMAP_PRESENT
);
6799 if (mddev
->major_version
!= info
->major_version
||
6800 mddev
->minor_version
!= info
->minor_version
||
6801 /* mddev->patch_version != info->patch_version || */
6802 mddev
->ctime
!= info
->ctime
||
6803 mddev
->level
!= info
->level
||
6804 /* mddev->layout != info->layout || */
6805 mddev
->persistent
!= !info
->not_persistent
||
6806 mddev
->chunk_sectors
!= info
->chunk_size
>> 9 ||
6807 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
6808 ((state
^info
->state
) & 0xfffffe00)
6811 /* Check there is only one change */
6812 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
6814 if (mddev
->raid_disks
!= info
->raid_disks
)
6816 if (mddev
->layout
!= info
->layout
)
6818 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
))
6825 if (mddev
->layout
!= info
->layout
) {
6827 * we don't need to do anything at the md level, the
6828 * personality will take care of it all.
6830 if (mddev
->pers
->check_reshape
== NULL
)
6833 mddev
->new_layout
= info
->layout
;
6834 rv
= mddev
->pers
->check_reshape(mddev
);
6836 mddev
->new_layout
= mddev
->layout
;
6840 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
6841 rv
= update_size(mddev
, (sector_t
)info
->size
* 2);
6843 if (mddev
->raid_disks
!= info
->raid_disks
)
6844 rv
= update_raid_disks(mddev
, info
->raid_disks
);
6846 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) {
6847 if (mddev
->pers
->quiesce
== NULL
|| mddev
->thread
== NULL
) {
6851 if (mddev
->recovery
|| mddev
->sync_thread
) {
6855 if (info
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
6856 struct bitmap
*bitmap
;
6857 /* add the bitmap */
6858 if (mddev
->bitmap
) {
6862 if (mddev
->bitmap_info
.default_offset
== 0) {
6866 mddev
->bitmap_info
.offset
=
6867 mddev
->bitmap_info
.default_offset
;
6868 mddev
->bitmap_info
.space
=
6869 mddev
->bitmap_info
.default_space
;
6870 mddev
->pers
->quiesce(mddev
, 1);
6871 bitmap
= bitmap_create(mddev
, -1);
6872 if (!IS_ERR(bitmap
)) {
6873 mddev
->bitmap
= bitmap
;
6874 rv
= bitmap_load(mddev
);
6876 rv
= PTR_ERR(bitmap
);
6878 bitmap_destroy(mddev
);
6879 mddev
->pers
->quiesce(mddev
, 0);
6881 /* remove the bitmap */
6882 if (!mddev
->bitmap
) {
6886 if (mddev
->bitmap
->storage
.file
) {
6890 if (mddev
->bitmap_info
.nodes
) {
6891 /* hold PW on all the bitmap lock */
6892 if (md_cluster_ops
->lock_all_bitmaps(mddev
) <= 0) {
6893 pr_warn("md: can't change bitmap to none since the array is in use by more than one node\n");
6895 md_cluster_ops
->unlock_all_bitmaps(mddev
);
6899 mddev
->bitmap_info
.nodes
= 0;
6900 md_cluster_ops
->leave(mddev
);
6902 mddev
->pers
->quiesce(mddev
, 1);
6903 bitmap_destroy(mddev
);
6904 mddev
->pers
->quiesce(mddev
, 0);
6905 mddev
->bitmap_info
.offset
= 0;
6908 md_update_sb(mddev
, 1);
6914 static int set_disk_faulty(struct mddev
*mddev
, dev_t dev
)
6916 struct md_rdev
*rdev
;
6919 if (mddev
->pers
== NULL
)
6923 rdev
= find_rdev_rcu(mddev
, dev
);
6927 md_error(mddev
, rdev
);
6928 if (!test_bit(Faulty
, &rdev
->flags
))
6936 * We have a problem here : there is no easy way to give a CHS
6937 * virtual geometry. We currently pretend that we have a 2 heads
6938 * 4 sectors (with a BIG number of cylinders...). This drives
6939 * dosfs just mad... ;-)
6941 static int md_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
6943 struct mddev
*mddev
= bdev
->bd_disk
->private_data
;
6947 geo
->cylinders
= mddev
->array_sectors
/ 8;
6951 static inline bool md_ioctl_valid(unsigned int cmd
)
6956 case GET_ARRAY_INFO
:
6957 case GET_BITMAP_FILE
:
6960 case HOT_REMOVE_DISK
:
6963 case RESTART_ARRAY_RW
:
6965 case SET_ARRAY_INFO
:
6966 case SET_BITMAP_FILE
:
6967 case SET_DISK_FAULTY
:
6970 case CLUSTERED_DISK_NACK
:
6977 static int md_ioctl(struct block_device
*bdev
, fmode_t mode
,
6978 unsigned int cmd
, unsigned long arg
)
6981 void __user
*argp
= (void __user
*)arg
;
6982 struct mddev
*mddev
= NULL
;
6984 bool did_set_md_closing
= false;
6986 if (!md_ioctl_valid(cmd
))
6991 case GET_ARRAY_INFO
:
6995 if (!capable(CAP_SYS_ADMIN
))
7000 * Commands dealing with the RAID driver but not any
7005 err
= get_version(argp
);
7011 autostart_arrays(arg
);
7018 * Commands creating/starting a new array:
7021 mddev
= bdev
->bd_disk
->private_data
;
7028 /* Some actions do not requires the mutex */
7030 case GET_ARRAY_INFO
:
7031 if (!mddev
->raid_disks
&& !mddev
->external
)
7034 err
= get_array_info(mddev
, argp
);
7038 if (!mddev
->raid_disks
&& !mddev
->external
)
7041 err
= get_disk_info(mddev
, argp
);
7044 case SET_DISK_FAULTY
:
7045 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
7048 case GET_BITMAP_FILE
:
7049 err
= get_bitmap_file(mddev
, argp
);
7054 if (cmd
== ADD_NEW_DISK
)
7055 /* need to ensure md_delayed_delete() has completed */
7056 flush_workqueue(md_misc_wq
);
7058 if (cmd
== HOT_REMOVE_DISK
)
7059 /* need to ensure recovery thread has run */
7060 wait_event_interruptible_timeout(mddev
->sb_wait
,
7061 !test_bit(MD_RECOVERY_NEEDED
,
7063 msecs_to_jiffies(5000));
7064 if (cmd
== STOP_ARRAY
|| cmd
== STOP_ARRAY_RO
) {
7065 /* Need to flush page cache, and ensure no-one else opens
7068 mutex_lock(&mddev
->open_mutex
);
7069 if (mddev
->pers
&& atomic_read(&mddev
->openers
) > 1) {
7070 mutex_unlock(&mddev
->open_mutex
);
7074 WARN_ON_ONCE(test_bit(MD_CLOSING
, &mddev
->flags
));
7075 set_bit(MD_CLOSING
, &mddev
->flags
);
7076 did_set_md_closing
= true;
7077 mutex_unlock(&mddev
->open_mutex
);
7078 sync_blockdev(bdev
);
7080 err
= mddev_lock(mddev
);
7082 pr_debug("md: ioctl lock interrupted, reason %d, cmd %d\n",
7087 if (cmd
== SET_ARRAY_INFO
) {
7088 mdu_array_info_t info
;
7090 memset(&info
, 0, sizeof(info
));
7091 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
7096 err
= update_array_info(mddev
, &info
);
7098 pr_warn("md: couldn't update array info. %d\n", err
);
7103 if (!list_empty(&mddev
->disks
)) {
7104 pr_warn("md: array %s already has disks!\n", mdname(mddev
));
7108 if (mddev
->raid_disks
) {
7109 pr_warn("md: array %s already initialised!\n", mdname(mddev
));
7113 err
= set_array_info(mddev
, &info
);
7115 pr_warn("md: couldn't set array info. %d\n", err
);
7122 * Commands querying/configuring an existing array:
7124 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
7125 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
7126 if ((!mddev
->raid_disks
&& !mddev
->external
)
7127 && cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
7128 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
7129 && cmd
!= GET_BITMAP_FILE
) {
7135 * Commands even a read-only array can execute:
7138 case RESTART_ARRAY_RW
:
7139 err
= restart_array(mddev
);
7143 err
= do_md_stop(mddev
, 0, bdev
);
7147 err
= md_set_readonly(mddev
, bdev
);
7150 case HOT_REMOVE_DISK
:
7151 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
7155 /* We can support ADD_NEW_DISK on read-only arrays
7156 * only if we are re-adding a preexisting device.
7157 * So require mddev->pers and MD_DISK_SYNC.
7160 mdu_disk_info_t info
;
7161 if (copy_from_user(&info
, argp
, sizeof(info
)))
7163 else if (!(info
.state
& (1<<MD_DISK_SYNC
)))
7164 /* Need to clear read-only for this */
7167 err
= add_new_disk(mddev
, &info
);
7173 if (get_user(ro
, (int __user
*)(arg
))) {
7179 /* if the bdev is going readonly the value of mddev->ro
7180 * does not matter, no writes are coming
7185 /* are we are already prepared for writes? */
7189 /* transitioning to readauto need only happen for
7190 * arrays that call md_write_start
7193 err
= restart_array(mddev
);
7196 set_disk_ro(mddev
->gendisk
, 0);
7203 * The remaining ioctls are changing the state of the
7204 * superblock, so we do not allow them on read-only arrays.
7206 if (mddev
->ro
&& mddev
->pers
) {
7207 if (mddev
->ro
== 2) {
7209 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7210 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7211 /* mddev_unlock will wake thread */
7212 /* If a device failed while we were read-only, we
7213 * need to make sure the metadata is updated now.
7215 if (test_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
)) {
7216 mddev_unlock(mddev
);
7217 wait_event(mddev
->sb_wait
,
7218 !test_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
) &&
7219 !test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
));
7220 mddev_lock_nointr(mddev
);
7231 mdu_disk_info_t info
;
7232 if (copy_from_user(&info
, argp
, sizeof(info
)))
7235 err
= add_new_disk(mddev
, &info
);
7239 case CLUSTERED_DISK_NACK
:
7240 if (mddev_is_clustered(mddev
))
7241 md_cluster_ops
->new_disk_ack(mddev
, false);
7247 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
7251 err
= do_md_run(mddev
);
7254 case SET_BITMAP_FILE
:
7255 err
= set_bitmap_file(mddev
, (int)arg
);
7264 if (mddev
->hold_active
== UNTIL_IOCTL
&&
7266 mddev
->hold_active
= 0;
7267 mddev_unlock(mddev
);
7269 if(did_set_md_closing
)
7270 clear_bit(MD_CLOSING
, &mddev
->flags
);
7273 #ifdef CONFIG_COMPAT
7274 static int md_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
7275 unsigned int cmd
, unsigned long arg
)
7278 case HOT_REMOVE_DISK
:
7280 case SET_DISK_FAULTY
:
7281 case SET_BITMAP_FILE
:
7282 /* These take in integer arg, do not convert */
7285 arg
= (unsigned long)compat_ptr(arg
);
7289 return md_ioctl(bdev
, mode
, cmd
, arg
);
7291 #endif /* CONFIG_COMPAT */
7293 static int md_open(struct block_device
*bdev
, fmode_t mode
)
7296 * Succeed if we can lock the mddev, which confirms that
7297 * it isn't being stopped right now.
7299 struct mddev
*mddev
= mddev_find(bdev
->bd_dev
);
7305 if (mddev
->gendisk
!= bdev
->bd_disk
) {
7306 /* we are racing with mddev_put which is discarding this
7310 /* Wait until bdev->bd_disk is definitely gone */
7311 flush_workqueue(md_misc_wq
);
7312 /* Then retry the open from the top */
7313 return -ERESTARTSYS
;
7315 BUG_ON(mddev
!= bdev
->bd_disk
->private_data
);
7317 if ((err
= mutex_lock_interruptible(&mddev
->open_mutex
)))
7320 if (test_bit(MD_CLOSING
, &mddev
->flags
)) {
7321 mutex_unlock(&mddev
->open_mutex
);
7327 atomic_inc(&mddev
->openers
);
7328 mutex_unlock(&mddev
->open_mutex
);
7330 check_disk_change(bdev
);
7337 static void md_release(struct gendisk
*disk
, fmode_t mode
)
7339 struct mddev
*mddev
= disk
->private_data
;
7342 atomic_dec(&mddev
->openers
);
7346 static int md_media_changed(struct gendisk
*disk
)
7348 struct mddev
*mddev
= disk
->private_data
;
7350 return mddev
->changed
;
7353 static int md_revalidate(struct gendisk
*disk
)
7355 struct mddev
*mddev
= disk
->private_data
;
7360 static const struct block_device_operations md_fops
=
7362 .owner
= THIS_MODULE
,
7364 .release
= md_release
,
7366 #ifdef CONFIG_COMPAT
7367 .compat_ioctl
= md_compat_ioctl
,
7369 .getgeo
= md_getgeo
,
7370 .media_changed
= md_media_changed
,
7371 .revalidate_disk
= md_revalidate
,
7374 static int md_thread(void *arg
)
7376 struct md_thread
*thread
= arg
;
7379 * md_thread is a 'system-thread', it's priority should be very
7380 * high. We avoid resource deadlocks individually in each
7381 * raid personality. (RAID5 does preallocation) We also use RR and
7382 * the very same RT priority as kswapd, thus we will never get
7383 * into a priority inversion deadlock.
7385 * we definitely have to have equal or higher priority than
7386 * bdflush, otherwise bdflush will deadlock if there are too
7387 * many dirty RAID5 blocks.
7390 allow_signal(SIGKILL
);
7391 while (!kthread_should_stop()) {
7393 /* We need to wait INTERRUPTIBLE so that
7394 * we don't add to the load-average.
7395 * That means we need to be sure no signals are
7398 if (signal_pending(current
))
7399 flush_signals(current
);
7401 wait_event_interruptible_timeout
7403 test_bit(THREAD_WAKEUP
, &thread
->flags
)
7404 || kthread_should_stop() || kthread_should_park(),
7407 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
7408 if (kthread_should_park())
7410 if (!kthread_should_stop())
7411 thread
->run(thread
);
7417 void md_wakeup_thread(struct md_thread
*thread
)
7420 pr_debug("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
7421 if (!test_and_set_bit(THREAD_WAKEUP
, &thread
->flags
))
7422 wake_up(&thread
->wqueue
);
7425 EXPORT_SYMBOL(md_wakeup_thread
);
7427 struct md_thread
*md_register_thread(void (*run
) (struct md_thread
*),
7428 struct mddev
*mddev
, const char *name
)
7430 struct md_thread
*thread
;
7432 thread
= kzalloc(sizeof(struct md_thread
), GFP_KERNEL
);
7436 init_waitqueue_head(&thread
->wqueue
);
7439 thread
->mddev
= mddev
;
7440 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
7441 thread
->tsk
= kthread_run(md_thread
, thread
,
7443 mdname(thread
->mddev
),
7445 if (IS_ERR(thread
->tsk
)) {
7451 EXPORT_SYMBOL(md_register_thread
);
7453 void md_unregister_thread(struct md_thread
**threadp
)
7455 struct md_thread
*thread
= *threadp
;
7458 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread
->tsk
));
7459 /* Locking ensures that mddev_unlock does not wake_up a
7460 * non-existent thread
7462 spin_lock(&pers_lock
);
7464 spin_unlock(&pers_lock
);
7466 kthread_stop(thread
->tsk
);
7469 EXPORT_SYMBOL(md_unregister_thread
);
7471 void md_error(struct mddev
*mddev
, struct md_rdev
*rdev
)
7473 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
7476 if (!mddev
->pers
|| !mddev
->pers
->error_handler
)
7478 mddev
->pers
->error_handler(mddev
,rdev
);
7479 if (mddev
->degraded
)
7480 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7481 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
7482 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7483 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7484 md_wakeup_thread(mddev
->thread
);
7485 if (mddev
->event_work
.func
)
7486 queue_work(md_misc_wq
, &mddev
->event_work
);
7487 md_new_event(mddev
);
7489 EXPORT_SYMBOL(md_error
);
7491 /* seq_file implementation /proc/mdstat */
7493 static void status_unused(struct seq_file
*seq
)
7496 struct md_rdev
*rdev
;
7498 seq_printf(seq
, "unused devices: ");
7500 list_for_each_entry(rdev
, &pending_raid_disks
, same_set
) {
7501 char b
[BDEVNAME_SIZE
];
7503 seq_printf(seq
, "%s ",
7504 bdevname(rdev
->bdev
,b
));
7507 seq_printf(seq
, "<none>");
7509 seq_printf(seq
, "\n");
7512 static int status_resync(struct seq_file
*seq
, struct mddev
*mddev
)
7514 sector_t max_sectors
, resync
, res
;
7515 unsigned long dt
, db
;
7518 unsigned int per_milli
;
7520 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
7521 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
7522 max_sectors
= mddev
->resync_max_sectors
;
7524 max_sectors
= mddev
->dev_sectors
;
7526 resync
= mddev
->curr_resync
;
7528 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
7529 /* Still cleaning up */
7530 resync
= max_sectors
;
7532 resync
-= atomic_read(&mddev
->recovery_active
);
7535 if (mddev
->recovery_cp
< MaxSector
) {
7536 seq_printf(seq
, "\tresync=PENDING");
7542 seq_printf(seq
, "\tresync=DELAYED");
7546 WARN_ON(max_sectors
== 0);
7547 /* Pick 'scale' such that (resync>>scale)*1000 will fit
7548 * in a sector_t, and (max_sectors>>scale) will fit in a
7549 * u32, as those are the requirements for sector_div.
7550 * Thus 'scale' must be at least 10
7553 if (sizeof(sector_t
) > sizeof(unsigned long)) {
7554 while ( max_sectors
/2 > (1ULL<<(scale
+32)))
7557 res
= (resync
>>scale
)*1000;
7558 sector_div(res
, (u32
)((max_sectors
>>scale
)+1));
7562 int i
, x
= per_milli
/50, y
= 20-x
;
7563 seq_printf(seq
, "[");
7564 for (i
= 0; i
< x
; i
++)
7565 seq_printf(seq
, "=");
7566 seq_printf(seq
, ">");
7567 for (i
= 0; i
< y
; i
++)
7568 seq_printf(seq
, ".");
7569 seq_printf(seq
, "] ");
7571 seq_printf(seq
, " %s =%3u.%u%% (%llu/%llu)",
7572 (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)?
7574 (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)?
7576 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
7577 "resync" : "recovery"))),
7578 per_milli
/10, per_milli
% 10,
7579 (unsigned long long) resync
/2,
7580 (unsigned long long) max_sectors
/2);
7583 * dt: time from mark until now
7584 * db: blocks written from mark until now
7585 * rt: remaining time
7587 * rt is a sector_t, so could be 32bit or 64bit.
7588 * So we divide before multiply in case it is 32bit and close
7590 * We scale the divisor (db) by 32 to avoid losing precision
7591 * near the end of resync when the number of remaining sectors
7593 * We then divide rt by 32 after multiplying by db to compensate.
7594 * The '+1' avoids division by zero if db is very small.
7596 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
7598 db
= (mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
))
7599 - mddev
->resync_mark_cnt
;
7601 rt
= max_sectors
- resync
; /* number of remaining sectors */
7602 sector_div(rt
, db
/32+1);
7606 seq_printf(seq
, " finish=%lu.%lumin", (unsigned long)rt
/ 60,
7607 ((unsigned long)rt
% 60)/6);
7609 seq_printf(seq
, " speed=%ldK/sec", db
/2/dt
);
7613 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
7615 struct list_head
*tmp
;
7617 struct mddev
*mddev
;
7625 spin_lock(&all_mddevs_lock
);
7626 list_for_each(tmp
,&all_mddevs
)
7628 mddev
= list_entry(tmp
, struct mddev
, all_mddevs
);
7630 spin_unlock(&all_mddevs_lock
);
7633 spin_unlock(&all_mddevs_lock
);
7635 return (void*)2;/* tail */
7639 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
7641 struct list_head
*tmp
;
7642 struct mddev
*next_mddev
, *mddev
= v
;
7648 spin_lock(&all_mddevs_lock
);
7650 tmp
= all_mddevs
.next
;
7652 tmp
= mddev
->all_mddevs
.next
;
7653 if (tmp
!= &all_mddevs
)
7654 next_mddev
= mddev_get(list_entry(tmp
,struct mddev
,all_mddevs
));
7656 next_mddev
= (void*)2;
7659 spin_unlock(&all_mddevs_lock
);
7667 static void md_seq_stop(struct seq_file
*seq
, void *v
)
7669 struct mddev
*mddev
= v
;
7671 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
7675 static int md_seq_show(struct seq_file
*seq
, void *v
)
7677 struct mddev
*mddev
= v
;
7679 struct md_rdev
*rdev
;
7681 if (v
== (void*)1) {
7682 struct md_personality
*pers
;
7683 seq_printf(seq
, "Personalities : ");
7684 spin_lock(&pers_lock
);
7685 list_for_each_entry(pers
, &pers_list
, list
)
7686 seq_printf(seq
, "[%s] ", pers
->name
);
7688 spin_unlock(&pers_lock
);
7689 seq_printf(seq
, "\n");
7690 seq
->poll_event
= atomic_read(&md_event_count
);
7693 if (v
== (void*)2) {
7698 spin_lock(&mddev
->lock
);
7699 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
7700 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
7701 mddev
->pers
? "" : "in");
7704 seq_printf(seq
, " (read-only)");
7706 seq_printf(seq
, " (auto-read-only)");
7707 seq_printf(seq
, " %s", mddev
->pers
->name
);
7712 rdev_for_each_rcu(rdev
, mddev
) {
7713 char b
[BDEVNAME_SIZE
];
7714 seq_printf(seq
, " %s[%d]",
7715 bdevname(rdev
->bdev
,b
), rdev
->desc_nr
);
7716 if (test_bit(WriteMostly
, &rdev
->flags
))
7717 seq_printf(seq
, "(W)");
7718 if (test_bit(Journal
, &rdev
->flags
))
7719 seq_printf(seq
, "(J)");
7720 if (test_bit(Faulty
, &rdev
->flags
)) {
7721 seq_printf(seq
, "(F)");
7724 if (rdev
->raid_disk
< 0)
7725 seq_printf(seq
, "(S)"); /* spare */
7726 if (test_bit(Replacement
, &rdev
->flags
))
7727 seq_printf(seq
, "(R)");
7728 sectors
+= rdev
->sectors
;
7732 if (!list_empty(&mddev
->disks
)) {
7734 seq_printf(seq
, "\n %llu blocks",
7735 (unsigned long long)
7736 mddev
->array_sectors
/ 2);
7738 seq_printf(seq
, "\n %llu blocks",
7739 (unsigned long long)sectors
/ 2);
7741 if (mddev
->persistent
) {
7742 if (mddev
->major_version
!= 0 ||
7743 mddev
->minor_version
!= 90) {
7744 seq_printf(seq
," super %d.%d",
7745 mddev
->major_version
,
7746 mddev
->minor_version
);
7748 } else if (mddev
->external
)
7749 seq_printf(seq
, " super external:%s",
7750 mddev
->metadata_type
);
7752 seq_printf(seq
, " super non-persistent");
7755 mddev
->pers
->status(seq
, mddev
);
7756 seq_printf(seq
, "\n ");
7757 if (mddev
->pers
->sync_request
) {
7758 if (status_resync(seq
, mddev
))
7759 seq_printf(seq
, "\n ");
7762 seq_printf(seq
, "\n ");
7764 bitmap_status(seq
, mddev
->bitmap
);
7766 seq_printf(seq
, "\n");
7768 spin_unlock(&mddev
->lock
);
7773 static const struct seq_operations md_seq_ops
= {
7774 .start
= md_seq_start
,
7775 .next
= md_seq_next
,
7776 .stop
= md_seq_stop
,
7777 .show
= md_seq_show
,
7780 static int md_seq_open(struct inode
*inode
, struct file
*file
)
7782 struct seq_file
*seq
;
7785 error
= seq_open(file
, &md_seq_ops
);
7789 seq
= file
->private_data
;
7790 seq
->poll_event
= atomic_read(&md_event_count
);
7794 static int md_unloading
;
7795 static unsigned int mdstat_poll(struct file
*filp
, poll_table
*wait
)
7797 struct seq_file
*seq
= filp
->private_data
;
7801 return POLLIN
|POLLRDNORM
|POLLERR
|POLLPRI
;
7802 poll_wait(filp
, &md_event_waiters
, wait
);
7804 /* always allow read */
7805 mask
= POLLIN
| POLLRDNORM
;
7807 if (seq
->poll_event
!= atomic_read(&md_event_count
))
7808 mask
|= POLLERR
| POLLPRI
;
7812 static const struct file_operations md_seq_fops
= {
7813 .owner
= THIS_MODULE
,
7814 .open
= md_seq_open
,
7816 .llseek
= seq_lseek
,
7817 .release
= seq_release_private
,
7818 .poll
= mdstat_poll
,
7821 int register_md_personality(struct md_personality
*p
)
7823 pr_debug("md: %s personality registered for level %d\n",
7825 spin_lock(&pers_lock
);
7826 list_add_tail(&p
->list
, &pers_list
);
7827 spin_unlock(&pers_lock
);
7830 EXPORT_SYMBOL(register_md_personality
);
7832 int unregister_md_personality(struct md_personality
*p
)
7834 pr_debug("md: %s personality unregistered\n", p
->name
);
7835 spin_lock(&pers_lock
);
7836 list_del_init(&p
->list
);
7837 spin_unlock(&pers_lock
);
7840 EXPORT_SYMBOL(unregister_md_personality
);
7842 int register_md_cluster_operations(struct md_cluster_operations
*ops
,
7843 struct module
*module
)
7846 spin_lock(&pers_lock
);
7847 if (md_cluster_ops
!= NULL
)
7850 md_cluster_ops
= ops
;
7851 md_cluster_mod
= module
;
7853 spin_unlock(&pers_lock
);
7856 EXPORT_SYMBOL(register_md_cluster_operations
);
7858 int unregister_md_cluster_operations(void)
7860 spin_lock(&pers_lock
);
7861 md_cluster_ops
= NULL
;
7862 spin_unlock(&pers_lock
);
7865 EXPORT_SYMBOL(unregister_md_cluster_operations
);
7867 int md_setup_cluster(struct mddev
*mddev
, int nodes
)
7869 if (!md_cluster_ops
)
7870 request_module("md-cluster");
7871 spin_lock(&pers_lock
);
7872 /* ensure module won't be unloaded */
7873 if (!md_cluster_ops
|| !try_module_get(md_cluster_mod
)) {
7874 pr_warn("can't find md-cluster module or get it's reference.\n");
7875 spin_unlock(&pers_lock
);
7878 spin_unlock(&pers_lock
);
7880 return md_cluster_ops
->join(mddev
, nodes
);
7883 void md_cluster_stop(struct mddev
*mddev
)
7885 if (!md_cluster_ops
)
7887 md_cluster_ops
->leave(mddev
);
7888 module_put(md_cluster_mod
);
7891 static int is_mddev_idle(struct mddev
*mddev
, int init
)
7893 struct md_rdev
*rdev
;
7899 rdev_for_each_rcu(rdev
, mddev
) {
7900 struct gendisk
*disk
= rdev
->bdev
->bd_contains
->bd_disk
;
7901 curr_events
= (int)part_stat_read(&disk
->part0
, sectors
[0]) +
7902 (int)part_stat_read(&disk
->part0
, sectors
[1]) -
7903 atomic_read(&disk
->sync_io
);
7904 /* sync IO will cause sync_io to increase before the disk_stats
7905 * as sync_io is counted when a request starts, and
7906 * disk_stats is counted when it completes.
7907 * So resync activity will cause curr_events to be smaller than
7908 * when there was no such activity.
7909 * non-sync IO will cause disk_stat to increase without
7910 * increasing sync_io so curr_events will (eventually)
7911 * be larger than it was before. Once it becomes
7912 * substantially larger, the test below will cause
7913 * the array to appear non-idle, and resync will slow
7915 * If there is a lot of outstanding resync activity when
7916 * we set last_event to curr_events, then all that activity
7917 * completing might cause the array to appear non-idle
7918 * and resync will be slowed down even though there might
7919 * not have been non-resync activity. This will only
7920 * happen once though. 'last_events' will soon reflect
7921 * the state where there is little or no outstanding
7922 * resync requests, and further resync activity will
7923 * always make curr_events less than last_events.
7926 if (init
|| curr_events
- rdev
->last_events
> 64) {
7927 rdev
->last_events
= curr_events
;
7935 void md_done_sync(struct mddev
*mddev
, int blocks
, int ok
)
7937 /* another "blocks" (512byte) blocks have been synced */
7938 atomic_sub(blocks
, &mddev
->recovery_active
);
7939 wake_up(&mddev
->recovery_wait
);
7941 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7942 set_bit(MD_RECOVERY_ERROR
, &mddev
->recovery
);
7943 md_wakeup_thread(mddev
->thread
);
7944 // stop recovery, signal do_sync ....
7947 EXPORT_SYMBOL(md_done_sync
);
7949 /* md_write_start(mddev, bi)
7950 * If we need to update some array metadata (e.g. 'active' flag
7951 * in superblock) before writing, schedule a superblock update
7952 * and wait for it to complete.
7954 void md_write_start(struct mddev
*mddev
, struct bio
*bi
)
7957 if (bio_data_dir(bi
) != WRITE
)
7960 BUG_ON(mddev
->ro
== 1);
7961 if (mddev
->ro
== 2) {
7962 /* need to switch to read/write */
7964 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7965 md_wakeup_thread(mddev
->thread
);
7966 md_wakeup_thread(mddev
->sync_thread
);
7970 percpu_ref_get(&mddev
->writes_pending
);
7971 smp_mb(); /* Match smp_mb in set_in_sync() */
7972 if (mddev
->safemode
== 1)
7973 mddev
->safemode
= 0;
7974 /* sync_checkers is always 0 when writes_pending is in per-cpu mode */
7975 if (mddev
->in_sync
|| !mddev
->sync_checkers
) {
7976 spin_lock(&mddev
->lock
);
7977 if (mddev
->in_sync
) {
7979 set_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
7980 set_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
7981 md_wakeup_thread(mddev
->thread
);
7984 spin_unlock(&mddev
->lock
);
7988 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7989 wait_event(mddev
->sb_wait
,
7990 !test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
));
7992 EXPORT_SYMBOL(md_write_start
);
7994 /* md_write_inc can only be called when md_write_start() has
7995 * already been called at least once of the current request.
7996 * It increments the counter and is useful when a single request
7997 * is split into several parts. Each part causes an increment and
7998 * so needs a matching md_write_end().
7999 * Unlike md_write_start(), it is safe to call md_write_inc() inside
8000 * a spinlocked region.
8002 void md_write_inc(struct mddev
*mddev
, struct bio
*bi
)
8004 if (bio_data_dir(bi
) != WRITE
)
8006 WARN_ON_ONCE(mddev
->in_sync
|| mddev
->ro
);
8007 percpu_ref_get(&mddev
->writes_pending
);
8009 EXPORT_SYMBOL(md_write_inc
);
8011 void md_write_end(struct mddev
*mddev
)
8013 percpu_ref_put(&mddev
->writes_pending
);
8015 if (mddev
->safemode
== 2)
8016 md_wakeup_thread(mddev
->thread
);
8017 else if (mddev
->safemode_delay
)
8018 /* The roundup() ensures this only performs locking once
8019 * every ->safemode_delay jiffies
8021 mod_timer(&mddev
->safemode_timer
,
8022 roundup(jiffies
, mddev
->safemode_delay
) +
8023 mddev
->safemode_delay
);
8026 EXPORT_SYMBOL(md_write_end
);
8028 /* md_allow_write(mddev)
8029 * Calling this ensures that the array is marked 'active' so that writes
8030 * may proceed without blocking. It is important to call this before
8031 * attempting a GFP_KERNEL allocation while holding the mddev lock.
8032 * Must be called with mddev_lock held.
8034 void md_allow_write(struct mddev
*mddev
)
8040 if (!mddev
->pers
->sync_request
)
8043 spin_lock(&mddev
->lock
);
8044 if (mddev
->in_sync
) {
8046 set_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
8047 set_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
8048 if (mddev
->safemode_delay
&&
8049 mddev
->safemode
== 0)
8050 mddev
->safemode
= 1;
8051 spin_unlock(&mddev
->lock
);
8052 md_update_sb(mddev
, 0);
8053 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
8054 /* wait for the dirty state to be recorded in the metadata */
8055 wait_event(mddev
->sb_wait
,
8056 !test_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
) &&
8057 !test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
));
8059 spin_unlock(&mddev
->lock
);
8061 EXPORT_SYMBOL_GPL(md_allow_write
);
8063 #define SYNC_MARKS 10
8064 #define SYNC_MARK_STEP (3*HZ)
8065 #define UPDATE_FREQUENCY (5*60*HZ)
8066 void md_do_sync(struct md_thread
*thread
)
8068 struct mddev
*mddev
= thread
->mddev
;
8069 struct mddev
*mddev2
;
8070 unsigned int currspeed
= 0,
8072 sector_t max_sectors
,j
, io_sectors
, recovery_done
;
8073 unsigned long mark
[SYNC_MARKS
];
8074 unsigned long update_time
;
8075 sector_t mark_cnt
[SYNC_MARKS
];
8077 struct list_head
*tmp
;
8078 sector_t last_check
;
8080 struct md_rdev
*rdev
;
8081 char *desc
, *action
= NULL
;
8082 struct blk_plug plug
;
8085 /* just incase thread restarts... */
8086 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
8088 if (mddev
->ro
) {/* never try to sync a read-only array */
8089 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8093 if (mddev_is_clustered(mddev
)) {
8094 ret
= md_cluster_ops
->resync_start(mddev
);
8098 set_bit(MD_CLUSTER_RESYNC_LOCKED
, &mddev
->flags
);
8099 if (!(test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
8100 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) ||
8101 test_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
))
8102 && ((unsigned long long)mddev
->curr_resync_completed
8103 < (unsigned long long)mddev
->resync_max_sectors
))
8107 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
8108 if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)) {
8109 desc
= "data-check";
8111 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
8112 desc
= "requested-resync";
8116 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
8121 mddev
->last_sync_action
= action
?: desc
;
8123 /* we overload curr_resync somewhat here.
8124 * 0 == not engaged in resync at all
8125 * 2 == checking that there is no conflict with another sync
8126 * 1 == like 2, but have yielded to allow conflicting resync to
8128 * other == active in resync - this many blocks
8130 * Before starting a resync we must have set curr_resync to
8131 * 2, and then checked that every "conflicting" array has curr_resync
8132 * less than ours. When we find one that is the same or higher
8133 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
8134 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
8135 * This will mean we have to start checking from the beginning again.
8140 int mddev2_minor
= -1;
8141 mddev
->curr_resync
= 2;
8144 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
8146 for_each_mddev(mddev2
, tmp
) {
8147 if (mddev2
== mddev
)
8149 if (!mddev
->parallel_resync
8150 && mddev2
->curr_resync
8151 && match_mddev_units(mddev
, mddev2
)) {
8153 if (mddev
< mddev2
&& mddev
->curr_resync
== 2) {
8154 /* arbitrarily yield */
8155 mddev
->curr_resync
= 1;
8156 wake_up(&resync_wait
);
8158 if (mddev
> mddev2
&& mddev
->curr_resync
== 1)
8159 /* no need to wait here, we can wait the next
8160 * time 'round when curr_resync == 2
8163 /* We need to wait 'interruptible' so as not to
8164 * contribute to the load average, and not to
8165 * be caught by 'softlockup'
8167 prepare_to_wait(&resync_wait
, &wq
, TASK_INTERRUPTIBLE
);
8168 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
8169 mddev2
->curr_resync
>= mddev
->curr_resync
) {
8170 if (mddev2_minor
!= mddev2
->md_minor
) {
8171 mddev2_minor
= mddev2
->md_minor
;
8172 pr_info("md: delaying %s of %s until %s has finished (they share one or more physical units)\n",
8173 desc
, mdname(mddev
),
8177 if (signal_pending(current
))
8178 flush_signals(current
);
8180 finish_wait(&resync_wait
, &wq
);
8183 finish_wait(&resync_wait
, &wq
);
8186 } while (mddev
->curr_resync
< 2);
8189 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
8190 /* resync follows the size requested by the personality,
8191 * which defaults to physical size, but can be virtual size
8193 max_sectors
= mddev
->resync_max_sectors
;
8194 atomic64_set(&mddev
->resync_mismatches
, 0);
8195 /* we don't use the checkpoint if there's a bitmap */
8196 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
8197 j
= mddev
->resync_min
;
8198 else if (!mddev
->bitmap
)
8199 j
= mddev
->recovery_cp
;
8201 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
8202 max_sectors
= mddev
->resync_max_sectors
;
8204 /* recovery follows the physical size of devices */
8205 max_sectors
= mddev
->dev_sectors
;
8208 rdev_for_each_rcu(rdev
, mddev
)
8209 if (rdev
->raid_disk
>= 0 &&
8210 !test_bit(Journal
, &rdev
->flags
) &&
8211 !test_bit(Faulty
, &rdev
->flags
) &&
8212 !test_bit(In_sync
, &rdev
->flags
) &&
8213 rdev
->recovery_offset
< j
)
8214 j
= rdev
->recovery_offset
;
8217 /* If there is a bitmap, we need to make sure all
8218 * writes that started before we added a spare
8219 * complete before we start doing a recovery.
8220 * Otherwise the write might complete and (via
8221 * bitmap_endwrite) set a bit in the bitmap after the
8222 * recovery has checked that bit and skipped that
8225 if (mddev
->bitmap
) {
8226 mddev
->pers
->quiesce(mddev
, 1);
8227 mddev
->pers
->quiesce(mddev
, 0);
8231 pr_info("md: %s of RAID array %s\n", desc
, mdname(mddev
));
8232 pr_debug("md: minimum _guaranteed_ speed: %d KB/sec/disk.\n", speed_min(mddev
));
8233 pr_debug("md: using maximum available idle IO bandwidth (but not more than %d KB/sec) for %s.\n",
8234 speed_max(mddev
), desc
);
8236 is_mddev_idle(mddev
, 1); /* this initializes IO event counters */
8239 for (m
= 0; m
< SYNC_MARKS
; m
++) {
8241 mark_cnt
[m
] = io_sectors
;
8244 mddev
->resync_mark
= mark
[last_mark
];
8245 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
8248 * Tune reconstruction:
8250 window
= 32*(PAGE_SIZE
/512);
8251 pr_debug("md: using %dk window, over a total of %lluk.\n",
8252 window
/2, (unsigned long long)max_sectors
/2);
8254 atomic_set(&mddev
->recovery_active
, 0);
8258 pr_debug("md: resuming %s of %s from checkpoint.\n",
8259 desc
, mdname(mddev
));
8260 mddev
->curr_resync
= j
;
8262 mddev
->curr_resync
= 3; /* no longer delayed */
8263 mddev
->curr_resync_completed
= j
;
8264 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
8265 md_new_event(mddev
);
8266 update_time
= jiffies
;
8268 blk_start_plug(&plug
);
8269 while (j
< max_sectors
) {
8274 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
8275 ((mddev
->curr_resync
> mddev
->curr_resync_completed
&&
8276 (mddev
->curr_resync
- mddev
->curr_resync_completed
)
8277 > (max_sectors
>> 4)) ||
8278 time_after_eq(jiffies
, update_time
+ UPDATE_FREQUENCY
) ||
8279 (j
- mddev
->curr_resync_completed
)*2
8280 >= mddev
->resync_max
- mddev
->curr_resync_completed
||
8281 mddev
->curr_resync_completed
> mddev
->resync_max
8283 /* time to update curr_resync_completed */
8284 wait_event(mddev
->recovery_wait
,
8285 atomic_read(&mddev
->recovery_active
) == 0);
8286 mddev
->curr_resync_completed
= j
;
8287 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) &&
8288 j
> mddev
->recovery_cp
)
8289 mddev
->recovery_cp
= j
;
8290 update_time
= jiffies
;
8291 set_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
8292 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
8295 while (j
>= mddev
->resync_max
&&
8296 !test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
8297 /* As this condition is controlled by user-space,
8298 * we can block indefinitely, so use '_interruptible'
8299 * to avoid triggering warnings.
8301 flush_signals(current
); /* just in case */
8302 wait_event_interruptible(mddev
->recovery_wait
,
8303 mddev
->resync_max
> j
8304 || test_bit(MD_RECOVERY_INTR
,
8308 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
8311 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
);
8313 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8317 if (!skipped
) { /* actual IO requested */
8318 io_sectors
+= sectors
;
8319 atomic_add(sectors
, &mddev
->recovery_active
);
8322 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
8326 if (j
> max_sectors
)
8327 /* when skipping, extra large numbers can be returned. */
8330 mddev
->curr_resync
= j
;
8331 mddev
->curr_mark_cnt
= io_sectors
;
8332 if (last_check
== 0)
8333 /* this is the earliest that rebuild will be
8334 * visible in /proc/mdstat
8336 md_new_event(mddev
);
8338 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
8341 last_check
= io_sectors
;
8343 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
8345 int next
= (last_mark
+1) % SYNC_MARKS
;
8347 mddev
->resync_mark
= mark
[next
];
8348 mddev
->resync_mark_cnt
= mark_cnt
[next
];
8349 mark
[next
] = jiffies
;
8350 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
8354 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
8358 * this loop exits only if either when we are slower than
8359 * the 'hard' speed limit, or the system was IO-idle for
8361 * the system might be non-idle CPU-wise, but we only care
8362 * about not overloading the IO subsystem. (things like an
8363 * e2fsck being done on the RAID array should execute fast)
8367 recovery_done
= io_sectors
- atomic_read(&mddev
->recovery_active
);
8368 currspeed
= ((unsigned long)(recovery_done
- mddev
->resync_mark_cnt
))/2
8369 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
8371 if (currspeed
> speed_min(mddev
)) {
8372 if (currspeed
> speed_max(mddev
)) {
8376 if (!is_mddev_idle(mddev
, 0)) {
8378 * Give other IO more of a chance.
8379 * The faster the devices, the less we wait.
8381 wait_event(mddev
->recovery_wait
,
8382 !atomic_read(&mddev
->recovery_active
));
8386 pr_info("md: %s: %s %s.\n",mdname(mddev
), desc
,
8387 test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)
8388 ? "interrupted" : "done");
8390 * this also signals 'finished resyncing' to md_stop
8392 blk_finish_plug(&plug
);
8393 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
8395 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
8396 !test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
8397 mddev
->curr_resync
> 3) {
8398 mddev
->curr_resync_completed
= mddev
->curr_resync
;
8399 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
8401 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
);
8403 if (!test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
) &&
8404 mddev
->curr_resync
> 3) {
8405 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
8406 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
8407 if (mddev
->curr_resync
>= mddev
->recovery_cp
) {
8408 pr_debug("md: checkpointing %s of %s.\n",
8409 desc
, mdname(mddev
));
8410 if (test_bit(MD_RECOVERY_ERROR
,
8412 mddev
->recovery_cp
=
8413 mddev
->curr_resync_completed
;
8415 mddev
->recovery_cp
=
8419 mddev
->recovery_cp
= MaxSector
;
8421 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
8422 mddev
->curr_resync
= MaxSector
;
8424 rdev_for_each_rcu(rdev
, mddev
)
8425 if (rdev
->raid_disk
>= 0 &&
8426 mddev
->delta_disks
>= 0 &&
8427 !test_bit(Journal
, &rdev
->flags
) &&
8428 !test_bit(Faulty
, &rdev
->flags
) &&
8429 !test_bit(In_sync
, &rdev
->flags
) &&
8430 rdev
->recovery_offset
< mddev
->curr_resync
)
8431 rdev
->recovery_offset
= mddev
->curr_resync
;
8436 /* set CHANGE_PENDING here since maybe another update is needed,
8437 * so other nodes are informed. It should be harmless for normal
8439 set_mask_bits(&mddev
->sb_flags
, 0,
8440 BIT(MD_SB_CHANGE_PENDING
) | BIT(MD_SB_CHANGE_DEVS
));
8442 spin_lock(&mddev
->lock
);
8443 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
8444 /* We completed so min/max setting can be forgotten if used. */
8445 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
8446 mddev
->resync_min
= 0;
8447 mddev
->resync_max
= MaxSector
;
8448 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
8449 mddev
->resync_min
= mddev
->curr_resync_completed
;
8450 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
8451 mddev
->curr_resync
= 0;
8452 spin_unlock(&mddev
->lock
);
8454 wake_up(&resync_wait
);
8455 md_wakeup_thread(mddev
->thread
);
8458 EXPORT_SYMBOL_GPL(md_do_sync
);
8460 static int remove_and_add_spares(struct mddev
*mddev
,
8461 struct md_rdev
*this)
8463 struct md_rdev
*rdev
;
8466 bool remove_some
= false;
8468 rdev_for_each(rdev
, mddev
) {
8469 if ((this == NULL
|| rdev
== this) &&
8470 rdev
->raid_disk
>= 0 &&
8471 !test_bit(Blocked
, &rdev
->flags
) &&
8472 test_bit(Faulty
, &rdev
->flags
) &&
8473 atomic_read(&rdev
->nr_pending
)==0) {
8474 /* Faulty non-Blocked devices with nr_pending == 0
8475 * never get nr_pending incremented,
8476 * never get Faulty cleared, and never get Blocked set.
8477 * So we can synchronize_rcu now rather than once per device
8480 set_bit(RemoveSynchronized
, &rdev
->flags
);
8486 rdev_for_each(rdev
, mddev
) {
8487 if ((this == NULL
|| rdev
== this) &&
8488 rdev
->raid_disk
>= 0 &&
8489 !test_bit(Blocked
, &rdev
->flags
) &&
8490 ((test_bit(RemoveSynchronized
, &rdev
->flags
) ||
8491 (!test_bit(In_sync
, &rdev
->flags
) &&
8492 !test_bit(Journal
, &rdev
->flags
))) &&
8493 atomic_read(&rdev
->nr_pending
)==0)) {
8494 if (mddev
->pers
->hot_remove_disk(
8495 mddev
, rdev
) == 0) {
8496 sysfs_unlink_rdev(mddev
, rdev
);
8497 rdev
->raid_disk
= -1;
8501 if (remove_some
&& test_bit(RemoveSynchronized
, &rdev
->flags
))
8502 clear_bit(RemoveSynchronized
, &rdev
->flags
);
8505 if (removed
&& mddev
->kobj
.sd
)
8506 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
8508 if (this && removed
)
8511 rdev_for_each(rdev
, mddev
) {
8512 if (this && this != rdev
)
8514 if (test_bit(Candidate
, &rdev
->flags
))
8516 if (rdev
->raid_disk
>= 0 &&
8517 !test_bit(In_sync
, &rdev
->flags
) &&
8518 !test_bit(Journal
, &rdev
->flags
) &&
8519 !test_bit(Faulty
, &rdev
->flags
))
8521 if (rdev
->raid_disk
>= 0)
8523 if (test_bit(Faulty
, &rdev
->flags
))
8525 if (!test_bit(Journal
, &rdev
->flags
)) {
8527 ! (rdev
->saved_raid_disk
>= 0 &&
8528 !test_bit(Bitmap_sync
, &rdev
->flags
)))
8531 rdev
->recovery_offset
= 0;
8534 hot_add_disk(mddev
, rdev
) == 0) {
8535 if (sysfs_link_rdev(mddev
, rdev
))
8536 /* failure here is OK */;
8537 if (!test_bit(Journal
, &rdev
->flags
))
8539 md_new_event(mddev
);
8540 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
8545 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
8549 static void md_start_sync(struct work_struct
*ws
)
8551 struct mddev
*mddev
= container_of(ws
, struct mddev
, del_work
);
8553 mddev
->sync_thread
= md_register_thread(md_do_sync
,
8556 if (!mddev
->sync_thread
) {
8557 pr_warn("%s: could not start resync thread...\n",
8559 /* leave the spares where they are, it shouldn't hurt */
8560 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8561 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
8562 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
8563 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
8564 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8565 wake_up(&resync_wait
);
8566 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
8568 if (mddev
->sysfs_action
)
8569 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
8571 md_wakeup_thread(mddev
->sync_thread
);
8572 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
8573 md_new_event(mddev
);
8577 * This routine is regularly called by all per-raid-array threads to
8578 * deal with generic issues like resync and super-block update.
8579 * Raid personalities that don't have a thread (linear/raid0) do not
8580 * need this as they never do any recovery or update the superblock.
8582 * It does not do any resync itself, but rather "forks" off other threads
8583 * to do that as needed.
8584 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
8585 * "->recovery" and create a thread at ->sync_thread.
8586 * When the thread finishes it sets MD_RECOVERY_DONE
8587 * and wakeups up this thread which will reap the thread and finish up.
8588 * This thread also removes any faulty devices (with nr_pending == 0).
8590 * The overall approach is:
8591 * 1/ if the superblock needs updating, update it.
8592 * 2/ If a recovery thread is running, don't do anything else.
8593 * 3/ If recovery has finished, clean up, possibly marking spares active.
8594 * 4/ If there are any faulty devices, remove them.
8595 * 5/ If array is degraded, try to add spares devices
8596 * 6/ If array has spares or is not in-sync, start a resync thread.
8598 void md_check_recovery(struct mddev
*mddev
)
8600 if (mddev
->suspended
)
8604 bitmap_daemon_work(mddev
);
8606 if (signal_pending(current
)) {
8607 if (mddev
->pers
->sync_request
&& !mddev
->external
) {
8608 pr_debug("md: %s in immediate safe mode\n",
8610 mddev
->safemode
= 2;
8612 flush_signals(current
);
8615 if (mddev
->ro
&& !test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
8618 (mddev
->sb_flags
& ~ (1<<MD_SB_CHANGE_PENDING
)) ||
8619 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
8620 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
8621 (mddev
->external
== 0 && mddev
->safemode
== 1) ||
8622 (mddev
->safemode
== 2
8623 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
8627 if (mddev_trylock(mddev
)) {
8631 struct md_rdev
*rdev
;
8632 if (!mddev
->external
&& mddev
->in_sync
)
8633 /* 'Blocked' flag not needed as failed devices
8634 * will be recorded if array switched to read/write.
8635 * Leaving it set will prevent the device
8636 * from being removed.
8638 rdev_for_each(rdev
, mddev
)
8639 clear_bit(Blocked
, &rdev
->flags
);
8640 /* On a read-only array we can:
8641 * - remove failed devices
8642 * - add already-in_sync devices if the array itself
8644 * As we only add devices that are already in-sync,
8645 * we can activate the spares immediately.
8647 remove_and_add_spares(mddev
, NULL
);
8648 /* There is no thread, but we need to call
8649 * ->spare_active and clear saved_raid_disk
8651 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8652 md_reap_sync_thread(mddev
);
8653 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8654 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
8655 clear_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
8659 if (mddev_is_clustered(mddev
)) {
8660 struct md_rdev
*rdev
;
8661 /* kick the device if another node issued a
8664 rdev_for_each(rdev
, mddev
) {
8665 if (test_and_clear_bit(ClusterRemove
, &rdev
->flags
) &&
8666 rdev
->raid_disk
< 0)
8667 md_kick_rdev_from_array(rdev
);
8671 if (!mddev
->external
&& !mddev
->in_sync
) {
8672 spin_lock(&mddev
->lock
);
8674 spin_unlock(&mddev
->lock
);
8677 if (mddev
->sb_flags
)
8678 md_update_sb(mddev
, 0);
8680 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
8681 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
8682 /* resync/recovery still happening */
8683 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
8686 if (mddev
->sync_thread
) {
8687 md_reap_sync_thread(mddev
);
8690 /* Set RUNNING before clearing NEEDED to avoid
8691 * any transients in the value of "sync_action".
8693 mddev
->curr_resync_completed
= 0;
8694 spin_lock(&mddev
->lock
);
8695 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8696 spin_unlock(&mddev
->lock
);
8697 /* Clear some bits that don't mean anything, but
8700 clear_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8701 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
8703 if (!test_and_clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
8704 test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
8706 /* no recovery is running.
8707 * remove any failed drives, then
8708 * add spares if possible.
8709 * Spares are also removed and re-added, to allow
8710 * the personality to fail the re-add.
8713 if (mddev
->reshape_position
!= MaxSector
) {
8714 if (mddev
->pers
->check_reshape
== NULL
||
8715 mddev
->pers
->check_reshape(mddev
) != 0)
8716 /* Cannot proceed */
8718 set_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
8719 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8720 } else if ((spares
= remove_and_add_spares(mddev
, NULL
))) {
8721 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8722 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
8723 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
8724 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8725 } else if (mddev
->recovery_cp
< MaxSector
) {
8726 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8727 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8728 } else if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
8729 /* nothing to be done ... */
8732 if (mddev
->pers
->sync_request
) {
8734 /* We are adding a device or devices to an array
8735 * which has the bitmap stored on all devices.
8736 * So make sure all bitmap pages get written
8738 bitmap_write_all(mddev
->bitmap
);
8740 INIT_WORK(&mddev
->del_work
, md_start_sync
);
8741 queue_work(md_misc_wq
, &mddev
->del_work
);
8745 if (!mddev
->sync_thread
) {
8746 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8747 wake_up(&resync_wait
);
8748 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
8750 if (mddev
->sysfs_action
)
8751 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
8754 wake_up(&mddev
->sb_wait
);
8755 mddev_unlock(mddev
);
8758 EXPORT_SYMBOL(md_check_recovery
);
8760 void md_reap_sync_thread(struct mddev
*mddev
)
8762 struct md_rdev
*rdev
;
8764 /* resync has finished, collect result */
8765 md_unregister_thread(&mddev
->sync_thread
);
8766 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
8767 !test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
8769 /* activate any spares */
8770 if (mddev
->pers
->spare_active(mddev
)) {
8771 sysfs_notify(&mddev
->kobj
, NULL
,
8773 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
8776 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
8777 mddev
->pers
->finish_reshape
)
8778 mddev
->pers
->finish_reshape(mddev
);
8780 /* If array is no-longer degraded, then any saved_raid_disk
8781 * information must be scrapped.
8783 if (!mddev
->degraded
)
8784 rdev_for_each(rdev
, mddev
)
8785 rdev
->saved_raid_disk
= -1;
8787 md_update_sb(mddev
, 1);
8788 /* MD_SB_CHANGE_PENDING should be cleared by md_update_sb, so we can
8789 * call resync_finish here if MD_CLUSTER_RESYNC_LOCKED is set by
8791 if (test_and_clear_bit(MD_CLUSTER_RESYNC_LOCKED
, &mddev
->flags
))
8792 md_cluster_ops
->resync_finish(mddev
);
8793 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8794 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
8795 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8796 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
8797 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
8798 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
8799 wake_up(&resync_wait
);
8800 /* flag recovery needed just to double check */
8801 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
8802 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
8803 md_new_event(mddev
);
8804 if (mddev
->event_work
.func
)
8805 queue_work(md_misc_wq
, &mddev
->event_work
);
8807 EXPORT_SYMBOL(md_reap_sync_thread
);
8809 void md_wait_for_blocked_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
8811 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
8812 wait_event_timeout(rdev
->blocked_wait
,
8813 !test_bit(Blocked
, &rdev
->flags
) &&
8814 !test_bit(BlockedBadBlocks
, &rdev
->flags
),
8815 msecs_to_jiffies(5000));
8816 rdev_dec_pending(rdev
, mddev
);
8818 EXPORT_SYMBOL(md_wait_for_blocked_rdev
);
8820 void md_finish_reshape(struct mddev
*mddev
)
8822 /* called be personality module when reshape completes. */
8823 struct md_rdev
*rdev
;
8825 rdev_for_each(rdev
, mddev
) {
8826 if (rdev
->data_offset
> rdev
->new_data_offset
)
8827 rdev
->sectors
+= rdev
->data_offset
- rdev
->new_data_offset
;
8829 rdev
->sectors
-= rdev
->new_data_offset
- rdev
->data_offset
;
8830 rdev
->data_offset
= rdev
->new_data_offset
;
8833 EXPORT_SYMBOL(md_finish_reshape
);
8835 /* Bad block management */
8837 /* Returns 1 on success, 0 on failure */
8838 int rdev_set_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
8841 struct mddev
*mddev
= rdev
->mddev
;
8844 s
+= rdev
->new_data_offset
;
8846 s
+= rdev
->data_offset
;
8847 rv
= badblocks_set(&rdev
->badblocks
, s
, sectors
, 0);
8849 /* Make sure they get written out promptly */
8850 if (test_bit(ExternalBbl
, &rdev
->flags
))
8851 sysfs_notify(&rdev
->kobj
, NULL
,
8852 "unacknowledged_bad_blocks");
8853 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
8854 set_mask_bits(&mddev
->sb_flags
, 0,
8855 BIT(MD_SB_CHANGE_CLEAN
) | BIT(MD_SB_CHANGE_PENDING
));
8856 md_wakeup_thread(rdev
->mddev
->thread
);
8861 EXPORT_SYMBOL_GPL(rdev_set_badblocks
);
8863 int rdev_clear_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
8868 s
+= rdev
->new_data_offset
;
8870 s
+= rdev
->data_offset
;
8871 rv
= badblocks_clear(&rdev
->badblocks
, s
, sectors
);
8872 if ((rv
== 0) && test_bit(ExternalBbl
, &rdev
->flags
))
8873 sysfs_notify(&rdev
->kobj
, NULL
, "bad_blocks");
8876 EXPORT_SYMBOL_GPL(rdev_clear_badblocks
);
8878 static int md_notify_reboot(struct notifier_block
*this,
8879 unsigned long code
, void *x
)
8881 struct list_head
*tmp
;
8882 struct mddev
*mddev
;
8885 for_each_mddev(mddev
, tmp
) {
8886 if (mddev_trylock(mddev
)) {
8888 __md_stop_writes(mddev
);
8889 if (mddev
->persistent
)
8890 mddev
->safemode
= 2;
8891 mddev_unlock(mddev
);
8896 * certain more exotic SCSI devices are known to be
8897 * volatile wrt too early system reboots. While the
8898 * right place to handle this issue is the given
8899 * driver, we do want to have a safe RAID driver ...
8907 static struct notifier_block md_notifier
= {
8908 .notifier_call
= md_notify_reboot
,
8910 .priority
= INT_MAX
, /* before any real devices */
8913 static void md_geninit(void)
8915 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
8917 proc_create("mdstat", S_IRUGO
, NULL
, &md_seq_fops
);
8920 static int __init
md_init(void)
8924 md_wq
= alloc_workqueue("md", WQ_MEM_RECLAIM
, 0);
8928 md_misc_wq
= alloc_workqueue("md_misc", 0, 0);
8932 if ((ret
= register_blkdev(MD_MAJOR
, "md")) < 0)
8935 if ((ret
= register_blkdev(0, "mdp")) < 0)
8939 blk_register_region(MKDEV(MD_MAJOR
, 0), 512, THIS_MODULE
,
8940 md_probe
, NULL
, NULL
);
8941 blk_register_region(MKDEV(mdp_major
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
8942 md_probe
, NULL
, NULL
);
8944 register_reboot_notifier(&md_notifier
);
8945 raid_table_header
= register_sysctl_table(raid_root_table
);
8951 unregister_blkdev(MD_MAJOR
, "md");
8953 destroy_workqueue(md_misc_wq
);
8955 destroy_workqueue(md_wq
);
8960 static void check_sb_changes(struct mddev
*mddev
, struct md_rdev
*rdev
)
8962 struct mdp_superblock_1
*sb
= page_address(rdev
->sb_page
);
8963 struct md_rdev
*rdev2
;
8965 char b
[BDEVNAME_SIZE
];
8968 * If size is changed in another node then we need to
8969 * do resize as well.
8971 if (mddev
->dev_sectors
!= le64_to_cpu(sb
->size
)) {
8972 ret
= mddev
->pers
->resize(mddev
, le64_to_cpu(sb
->size
));
8974 pr_info("md-cluster: resize failed\n");
8976 bitmap_update_sb(mddev
->bitmap
);
8979 /* Check for change of roles in the active devices */
8980 rdev_for_each(rdev2
, mddev
) {
8981 if (test_bit(Faulty
, &rdev2
->flags
))
8984 /* Check if the roles changed */
8985 role
= le16_to_cpu(sb
->dev_roles
[rdev2
->desc_nr
]);
8987 if (test_bit(Candidate
, &rdev2
->flags
)) {
8988 if (role
== 0xfffe) {
8989 pr_info("md: Removing Candidate device %s because add failed\n", bdevname(rdev2
->bdev
,b
));
8990 md_kick_rdev_from_array(rdev2
);
8994 clear_bit(Candidate
, &rdev2
->flags
);
8997 if (role
!= rdev2
->raid_disk
) {
8999 if (rdev2
->raid_disk
== -1 && role
!= 0xffff) {
9000 rdev2
->saved_raid_disk
= role
;
9001 ret
= remove_and_add_spares(mddev
, rdev2
);
9002 pr_info("Activated spare: %s\n",
9003 bdevname(rdev2
->bdev
,b
));
9004 /* wakeup mddev->thread here, so array could
9005 * perform resync with the new activated disk */
9006 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
9007 md_wakeup_thread(mddev
->thread
);
9011 * We just want to do the minimum to mark the disk
9012 * as faulty. The recovery is performed by the
9013 * one who initiated the error.
9015 if ((role
== 0xfffe) || (role
== 0xfffd)) {
9016 md_error(mddev
, rdev2
);
9017 clear_bit(Blocked
, &rdev2
->flags
);
9022 if (mddev
->raid_disks
!= le32_to_cpu(sb
->raid_disks
))
9023 update_raid_disks(mddev
, le32_to_cpu(sb
->raid_disks
));
9025 /* Finally set the event to be up to date */
9026 mddev
->events
= le64_to_cpu(sb
->events
);
9029 static int read_rdev(struct mddev
*mddev
, struct md_rdev
*rdev
)
9032 struct page
*swapout
= rdev
->sb_page
;
9033 struct mdp_superblock_1
*sb
;
9035 /* Store the sb page of the rdev in the swapout temporary
9036 * variable in case we err in the future
9038 rdev
->sb_page
= NULL
;
9039 err
= alloc_disk_sb(rdev
);
9041 ClearPageUptodate(rdev
->sb_page
);
9042 rdev
->sb_loaded
= 0;
9043 err
= super_types
[mddev
->major_version
].
9044 load_super(rdev
, NULL
, mddev
->minor_version
);
9047 pr_warn("%s: %d Could not reload rdev(%d) err: %d. Restoring old values\n",
9048 __func__
, __LINE__
, rdev
->desc_nr
, err
);
9050 put_page(rdev
->sb_page
);
9051 rdev
->sb_page
= swapout
;
9052 rdev
->sb_loaded
= 1;
9056 sb
= page_address(rdev
->sb_page
);
9057 /* Read the offset unconditionally, even if MD_FEATURE_RECOVERY_OFFSET
9061 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RECOVERY_OFFSET
))
9062 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
9064 /* The other node finished recovery, call spare_active to set
9065 * device In_sync and mddev->degraded
9067 if (rdev
->recovery_offset
== MaxSector
&&
9068 !test_bit(In_sync
, &rdev
->flags
) &&
9069 mddev
->pers
->spare_active(mddev
))
9070 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
9076 void md_reload_sb(struct mddev
*mddev
, int nr
)
9078 struct md_rdev
*rdev
;
9082 rdev_for_each_rcu(rdev
, mddev
) {
9083 if (rdev
->desc_nr
== nr
)
9087 if (!rdev
|| rdev
->desc_nr
!= nr
) {
9088 pr_warn("%s: %d Could not find rdev with nr %d\n", __func__
, __LINE__
, nr
);
9092 err
= read_rdev(mddev
, rdev
);
9096 check_sb_changes(mddev
, rdev
);
9098 /* Read all rdev's to update recovery_offset */
9099 rdev_for_each_rcu(rdev
, mddev
)
9100 read_rdev(mddev
, rdev
);
9102 EXPORT_SYMBOL(md_reload_sb
);
9107 * Searches all registered partitions for autorun RAID arrays
9111 static DEFINE_MUTEX(detected_devices_mutex
);
9112 static LIST_HEAD(all_detected_devices
);
9113 struct detected_devices_node
{
9114 struct list_head list
;
9118 void md_autodetect_dev(dev_t dev
)
9120 struct detected_devices_node
*node_detected_dev
;
9122 node_detected_dev
= kzalloc(sizeof(*node_detected_dev
), GFP_KERNEL
);
9123 if (node_detected_dev
) {
9124 node_detected_dev
->dev
= dev
;
9125 mutex_lock(&detected_devices_mutex
);
9126 list_add_tail(&node_detected_dev
->list
, &all_detected_devices
);
9127 mutex_unlock(&detected_devices_mutex
);
9131 static void autostart_arrays(int part
)
9133 struct md_rdev
*rdev
;
9134 struct detected_devices_node
*node_detected_dev
;
9136 int i_scanned
, i_passed
;
9141 pr_info("md: Autodetecting RAID arrays.\n");
9143 mutex_lock(&detected_devices_mutex
);
9144 while (!list_empty(&all_detected_devices
) && i_scanned
< INT_MAX
) {
9146 node_detected_dev
= list_entry(all_detected_devices
.next
,
9147 struct detected_devices_node
, list
);
9148 list_del(&node_detected_dev
->list
);
9149 dev
= node_detected_dev
->dev
;
9150 kfree(node_detected_dev
);
9151 mutex_unlock(&detected_devices_mutex
);
9152 rdev
= md_import_device(dev
,0, 90);
9153 mutex_lock(&detected_devices_mutex
);
9157 if (test_bit(Faulty
, &rdev
->flags
))
9160 set_bit(AutoDetected
, &rdev
->flags
);
9161 list_add(&rdev
->same_set
, &pending_raid_disks
);
9164 mutex_unlock(&detected_devices_mutex
);
9166 pr_debug("md: Scanned %d and added %d devices.\n", i_scanned
, i_passed
);
9168 autorun_devices(part
);
9171 #endif /* !MODULE */
9173 static __exit
void md_exit(void)
9175 struct mddev
*mddev
;
9176 struct list_head
*tmp
;
9179 blk_unregister_region(MKDEV(MD_MAJOR
,0), 512);
9180 blk_unregister_region(MKDEV(mdp_major
,0), 1U << MINORBITS
);
9182 unregister_blkdev(MD_MAJOR
,"md");
9183 unregister_blkdev(mdp_major
, "mdp");
9184 unregister_reboot_notifier(&md_notifier
);
9185 unregister_sysctl_table(raid_table_header
);
9187 /* We cannot unload the modules while some process is
9188 * waiting for us in select() or poll() - wake them up
9191 while (waitqueue_active(&md_event_waiters
)) {
9192 /* not safe to leave yet */
9193 wake_up(&md_event_waiters
);
9197 remove_proc_entry("mdstat", NULL
);
9199 for_each_mddev(mddev
, tmp
) {
9200 export_array(mddev
);
9202 mddev
->hold_active
= 0;
9204 * for_each_mddev() will call mddev_put() at the end of each
9205 * iteration. As the mddev is now fully clear, this will
9206 * schedule the mddev for destruction by a workqueue, and the
9207 * destroy_workqueue() below will wait for that to complete.
9210 destroy_workqueue(md_misc_wq
);
9211 destroy_workqueue(md_wq
);
9214 subsys_initcall(md_init
);
9215 module_exit(md_exit
)
9217 static int get_ro(char *buffer
, struct kernel_param
*kp
)
9219 return sprintf(buffer
, "%d", start_readonly
);
9221 static int set_ro(const char *val
, struct kernel_param
*kp
)
9223 return kstrtouint(val
, 10, (unsigned int *)&start_readonly
);
9226 module_param_call(start_ro
, set_ro
, get_ro
, NULL
, S_IRUSR
|S_IWUSR
);
9227 module_param(start_dirty_degraded
, int, S_IRUGO
|S_IWUSR
);
9228 module_param_call(new_array
, add_named_array
, NULL
, NULL
, S_IWUSR
);
9229 module_param(create_on_open
, bool, S_IRUSR
|S_IWUSR
);
9231 MODULE_LICENSE("GPL");
9232 MODULE_DESCRIPTION("MD RAID framework");
9234 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);