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_bioset, but with a local bio set
191 struct bio
*bio_alloc_mddev(gfp_t gfp_mask
, int nr_iovecs
,
196 if (!mddev
|| !mddev
->bio_set
)
197 return bio_alloc(gfp_mask
, nr_iovecs
);
199 b
= bio_alloc_bioset(gfp_mask
, nr_iovecs
, mddev
->bio_set
);
204 EXPORT_SYMBOL_GPL(bio_alloc_mddev
);
206 static struct bio
*md_bio_alloc_sync(struct mddev
*mddev
)
208 if (!mddev
|| !mddev
->sync_set
)
209 return bio_alloc(GFP_NOIO
, 1);
211 return bio_alloc_bioset(GFP_NOIO
, 1, mddev
->sync_set
);
215 * We have a system wide 'event count' that is incremented
216 * on any 'interesting' event, and readers of /proc/mdstat
217 * can use 'poll' or 'select' to find out when the event
221 * start array, stop array, error, add device, remove device,
222 * start build, activate spare
224 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters
);
225 static atomic_t md_event_count
;
226 void md_new_event(struct mddev
*mddev
)
228 atomic_inc(&md_event_count
);
229 wake_up(&md_event_waiters
);
231 EXPORT_SYMBOL_GPL(md_new_event
);
234 * Enables to iterate over all existing md arrays
235 * all_mddevs_lock protects this list.
237 static LIST_HEAD(all_mddevs
);
238 static DEFINE_SPINLOCK(all_mddevs_lock
);
241 * iterates through all used mddevs in the system.
242 * We take care to grab the all_mddevs_lock whenever navigating
243 * the list, and to always hold a refcount when unlocked.
244 * Any code which breaks out of this loop while own
245 * a reference to the current mddev and must mddev_put it.
247 #define for_each_mddev(_mddev,_tmp) \
249 for (({ spin_lock(&all_mddevs_lock); \
250 _tmp = all_mddevs.next; \
252 ({ if (_tmp != &all_mddevs) \
253 mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\
254 spin_unlock(&all_mddevs_lock); \
255 if (_mddev) mddev_put(_mddev); \
256 _mddev = list_entry(_tmp, struct mddev, all_mddevs); \
257 _tmp != &all_mddevs;}); \
258 ({ spin_lock(&all_mddevs_lock); \
259 _tmp = _tmp->next;}) \
262 /* Rather than calling directly into the personality make_request function,
263 * IO requests come here first so that we can check if the device is
264 * being suspended pending a reconfiguration.
265 * We hold a refcount over the call to ->make_request. By the time that
266 * call has finished, the bio has been linked into some internal structure
267 * and so is visible to ->quiesce(), so we don't need the refcount any more.
269 static blk_qc_t
md_make_request(struct request_queue
*q
, struct bio
*bio
)
271 const int rw
= bio_data_dir(bio
);
272 struct mddev
*mddev
= q
->queuedata
;
273 unsigned int sectors
;
276 blk_queue_split(q
, &bio
);
278 if (mddev
== NULL
|| mddev
->pers
== NULL
) {
280 return BLK_QC_T_NONE
;
282 if (mddev
->ro
== 1 && unlikely(rw
== WRITE
)) {
283 if (bio_sectors(bio
) != 0)
284 bio
->bi_status
= BLK_STS_IOERR
;
286 return BLK_QC_T_NONE
;
290 if (mddev
->suspended
) {
293 prepare_to_wait(&mddev
->sb_wait
, &__wait
,
294 TASK_UNINTERRUPTIBLE
);
295 if (!mddev
->suspended
)
301 finish_wait(&mddev
->sb_wait
, &__wait
);
303 atomic_inc(&mddev
->active_io
);
307 * save the sectors now since our bio can
308 * go away inside make_request
310 sectors
= bio_sectors(bio
);
311 /* bio could be mergeable after passing to underlayer */
312 bio
->bi_opf
&= ~REQ_NOMERGE
;
313 if (!mddev
->pers
->make_request(mddev
, bio
)) {
314 atomic_dec(&mddev
->active_io
);
315 wake_up(&mddev
->sb_wait
);
316 goto check_suspended
;
319 cpu
= part_stat_lock();
320 part_stat_inc(cpu
, &mddev
->gendisk
->part0
, ios
[rw
]);
321 part_stat_add(cpu
, &mddev
->gendisk
->part0
, sectors
[rw
], sectors
);
324 if (atomic_dec_and_test(&mddev
->active_io
) && mddev
->suspended
)
325 wake_up(&mddev
->sb_wait
);
327 return BLK_QC_T_NONE
;
330 /* mddev_suspend makes sure no new requests are submitted
331 * to the device, and that any requests that have been submitted
332 * are completely handled.
333 * Once mddev_detach() is called and completes, the module will be
336 void mddev_suspend(struct mddev
*mddev
)
338 WARN_ON_ONCE(mddev
->thread
&& current
== mddev
->thread
->tsk
);
339 if (mddev
->suspended
++)
342 wake_up(&mddev
->sb_wait
);
343 wait_event(mddev
->sb_wait
, atomic_read(&mddev
->active_io
) == 0);
344 mddev
->pers
->quiesce(mddev
, 1);
346 del_timer_sync(&mddev
->safemode_timer
);
348 EXPORT_SYMBOL_GPL(mddev_suspend
);
350 void mddev_resume(struct mddev
*mddev
)
352 if (--mddev
->suspended
)
354 wake_up(&mddev
->sb_wait
);
355 mddev
->pers
->quiesce(mddev
, 0);
357 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
358 md_wakeup_thread(mddev
->thread
);
359 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
361 EXPORT_SYMBOL_GPL(mddev_resume
);
363 int mddev_congested(struct mddev
*mddev
, int bits
)
365 struct md_personality
*pers
= mddev
->pers
;
369 if (mddev
->suspended
)
371 else if (pers
&& pers
->congested
)
372 ret
= pers
->congested(mddev
, bits
);
376 EXPORT_SYMBOL_GPL(mddev_congested
);
377 static int md_congested(void *data
, int bits
)
379 struct mddev
*mddev
= data
;
380 return mddev_congested(mddev
, bits
);
384 * Generic flush handling for md
387 static void md_end_flush(struct bio
*bio
)
389 struct md_rdev
*rdev
= bio
->bi_private
;
390 struct mddev
*mddev
= rdev
->mddev
;
392 rdev_dec_pending(rdev
, mddev
);
394 if (atomic_dec_and_test(&mddev
->flush_pending
)) {
395 /* The pre-request flush has finished */
396 queue_work(md_wq
, &mddev
->flush_work
);
401 static void md_submit_flush_data(struct work_struct
*ws
);
403 static void submit_flushes(struct work_struct
*ws
)
405 struct mddev
*mddev
= container_of(ws
, struct mddev
, flush_work
);
406 struct md_rdev
*rdev
;
408 INIT_WORK(&mddev
->flush_work
, md_submit_flush_data
);
409 atomic_set(&mddev
->flush_pending
, 1);
411 rdev_for_each_rcu(rdev
, mddev
)
412 if (rdev
->raid_disk
>= 0 &&
413 !test_bit(Faulty
, &rdev
->flags
)) {
414 /* Take two references, one is dropped
415 * when request finishes, one after
416 * we reclaim rcu_read_lock
419 atomic_inc(&rdev
->nr_pending
);
420 atomic_inc(&rdev
->nr_pending
);
422 bi
= bio_alloc_mddev(GFP_NOIO
, 0, mddev
);
423 bi
->bi_end_io
= md_end_flush
;
424 bi
->bi_private
= rdev
;
425 bio_set_dev(bi
, rdev
->bdev
);
426 bi
->bi_opf
= REQ_OP_WRITE
| REQ_PREFLUSH
;
427 atomic_inc(&mddev
->flush_pending
);
430 rdev_dec_pending(rdev
, mddev
);
433 if (atomic_dec_and_test(&mddev
->flush_pending
))
434 queue_work(md_wq
, &mddev
->flush_work
);
437 static void md_submit_flush_data(struct work_struct
*ws
)
439 struct mddev
*mddev
= container_of(ws
, struct mddev
, flush_work
);
440 struct bio
*bio
= mddev
->flush_bio
;
442 if (bio
->bi_iter
.bi_size
== 0)
443 /* an empty barrier - all done */
446 bio
->bi_opf
&= ~REQ_PREFLUSH
;
447 mddev
->pers
->make_request(mddev
, bio
);
450 mddev
->flush_bio
= NULL
;
451 wake_up(&mddev
->sb_wait
);
454 void md_flush_request(struct mddev
*mddev
, struct bio
*bio
)
456 spin_lock_irq(&mddev
->lock
);
457 wait_event_lock_irq(mddev
->sb_wait
,
460 mddev
->flush_bio
= bio
;
461 spin_unlock_irq(&mddev
->lock
);
463 INIT_WORK(&mddev
->flush_work
, submit_flushes
);
464 queue_work(md_wq
, &mddev
->flush_work
);
466 EXPORT_SYMBOL(md_flush_request
);
468 static inline struct mddev
*mddev_get(struct mddev
*mddev
)
470 atomic_inc(&mddev
->active
);
474 static void mddev_delayed_delete(struct work_struct
*ws
);
476 static void mddev_put(struct mddev
*mddev
)
478 struct bio_set
*bs
= NULL
, *sync_bs
= NULL
;
480 if (!atomic_dec_and_lock(&mddev
->active
, &all_mddevs_lock
))
482 if (!mddev
->raid_disks
&& list_empty(&mddev
->disks
) &&
483 mddev
->ctime
== 0 && !mddev
->hold_active
) {
484 /* Array is not configured at all, and not held active,
486 list_del_init(&mddev
->all_mddevs
);
488 sync_bs
= mddev
->sync_set
;
489 mddev
->bio_set
= NULL
;
490 mddev
->sync_set
= NULL
;
491 if (mddev
->gendisk
) {
492 /* We did a probe so need to clean up. Call
493 * queue_work inside the spinlock so that
494 * flush_workqueue() after mddev_find will
495 * succeed in waiting for the work to be done.
497 INIT_WORK(&mddev
->del_work
, mddev_delayed_delete
);
498 queue_work(md_misc_wq
, &mddev
->del_work
);
502 spin_unlock(&all_mddevs_lock
);
506 bioset_free(sync_bs
);
509 static void md_safemode_timeout(unsigned long data
);
511 void mddev_init(struct mddev
*mddev
)
513 mutex_init(&mddev
->open_mutex
);
514 mutex_init(&mddev
->reconfig_mutex
);
515 mutex_init(&mddev
->bitmap_info
.mutex
);
516 INIT_LIST_HEAD(&mddev
->disks
);
517 INIT_LIST_HEAD(&mddev
->all_mddevs
);
518 setup_timer(&mddev
->safemode_timer
, md_safemode_timeout
,
519 (unsigned long) mddev
);
520 atomic_set(&mddev
->active
, 1);
521 atomic_set(&mddev
->openers
, 0);
522 atomic_set(&mddev
->active_io
, 0);
523 spin_lock_init(&mddev
->lock
);
524 atomic_set(&mddev
->flush_pending
, 0);
525 init_waitqueue_head(&mddev
->sb_wait
);
526 init_waitqueue_head(&mddev
->recovery_wait
);
527 mddev
->reshape_position
= MaxSector
;
528 mddev
->reshape_backwards
= 0;
529 mddev
->last_sync_action
= "none";
530 mddev
->resync_min
= 0;
531 mddev
->resync_max
= MaxSector
;
532 mddev
->level
= LEVEL_NONE
;
534 EXPORT_SYMBOL_GPL(mddev_init
);
536 static struct mddev
*mddev_find(dev_t unit
)
538 struct mddev
*mddev
, *new = NULL
;
540 if (unit
&& MAJOR(unit
) != MD_MAJOR
)
541 unit
&= ~((1<<MdpMinorShift
)-1);
544 spin_lock(&all_mddevs_lock
);
547 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
548 if (mddev
->unit
== unit
) {
550 spin_unlock(&all_mddevs_lock
);
556 list_add(&new->all_mddevs
, &all_mddevs
);
557 spin_unlock(&all_mddevs_lock
);
558 new->hold_active
= UNTIL_IOCTL
;
562 /* find an unused unit number */
563 static int next_minor
= 512;
564 int start
= next_minor
;
568 dev
= MKDEV(MD_MAJOR
, next_minor
);
570 if (next_minor
> MINORMASK
)
572 if (next_minor
== start
) {
573 /* Oh dear, all in use. */
574 spin_unlock(&all_mddevs_lock
);
580 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
581 if (mddev
->unit
== dev
) {
587 new->md_minor
= MINOR(dev
);
588 new->hold_active
= UNTIL_STOP
;
589 list_add(&new->all_mddevs
, &all_mddevs
);
590 spin_unlock(&all_mddevs_lock
);
593 spin_unlock(&all_mddevs_lock
);
595 new = kzalloc(sizeof(*new), GFP_KERNEL
);
600 if (MAJOR(unit
) == MD_MAJOR
)
601 new->md_minor
= MINOR(unit
);
603 new->md_minor
= MINOR(unit
) >> MdpMinorShift
;
610 static struct attribute_group md_redundancy_group
;
612 void mddev_unlock(struct mddev
*mddev
)
614 if (mddev
->to_remove
) {
615 /* These cannot be removed under reconfig_mutex as
616 * an access to the files will try to take reconfig_mutex
617 * while holding the file unremovable, which leads to
619 * So hold set sysfs_active while the remove in happeing,
620 * and anything else which might set ->to_remove or my
621 * otherwise change the sysfs namespace will fail with
622 * -EBUSY if sysfs_active is still set.
623 * We set sysfs_active under reconfig_mutex and elsewhere
624 * test it under the same mutex to ensure its correct value
627 struct attribute_group
*to_remove
= mddev
->to_remove
;
628 mddev
->to_remove
= NULL
;
629 mddev
->sysfs_active
= 1;
630 mutex_unlock(&mddev
->reconfig_mutex
);
632 if (mddev
->kobj
.sd
) {
633 if (to_remove
!= &md_redundancy_group
)
634 sysfs_remove_group(&mddev
->kobj
, to_remove
);
635 if (mddev
->pers
== NULL
||
636 mddev
->pers
->sync_request
== NULL
) {
637 sysfs_remove_group(&mddev
->kobj
, &md_redundancy_group
);
638 if (mddev
->sysfs_action
)
639 sysfs_put(mddev
->sysfs_action
);
640 mddev
->sysfs_action
= NULL
;
643 mddev
->sysfs_active
= 0;
645 mutex_unlock(&mddev
->reconfig_mutex
);
647 /* As we've dropped the mutex we need a spinlock to
648 * make sure the thread doesn't disappear
650 spin_lock(&pers_lock
);
651 md_wakeup_thread(mddev
->thread
);
652 spin_unlock(&pers_lock
);
654 EXPORT_SYMBOL_GPL(mddev_unlock
);
656 struct md_rdev
*md_find_rdev_nr_rcu(struct mddev
*mddev
, int nr
)
658 struct md_rdev
*rdev
;
660 rdev_for_each_rcu(rdev
, mddev
)
661 if (rdev
->desc_nr
== nr
)
666 EXPORT_SYMBOL_GPL(md_find_rdev_nr_rcu
);
668 static struct md_rdev
*find_rdev(struct mddev
*mddev
, dev_t dev
)
670 struct md_rdev
*rdev
;
672 rdev_for_each(rdev
, mddev
)
673 if (rdev
->bdev
->bd_dev
== dev
)
679 static struct md_rdev
*find_rdev_rcu(struct mddev
*mddev
, dev_t dev
)
681 struct md_rdev
*rdev
;
683 rdev_for_each_rcu(rdev
, mddev
)
684 if (rdev
->bdev
->bd_dev
== dev
)
690 static struct md_personality
*find_pers(int level
, char *clevel
)
692 struct md_personality
*pers
;
693 list_for_each_entry(pers
, &pers_list
, list
) {
694 if (level
!= LEVEL_NONE
&& pers
->level
== level
)
696 if (strcmp(pers
->name
, clevel
)==0)
702 /* return the offset of the super block in 512byte sectors */
703 static inline sector_t
calc_dev_sboffset(struct md_rdev
*rdev
)
705 sector_t num_sectors
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
706 return MD_NEW_SIZE_SECTORS(num_sectors
);
709 static int alloc_disk_sb(struct md_rdev
*rdev
)
711 rdev
->sb_page
= alloc_page(GFP_KERNEL
);
717 void md_rdev_clear(struct md_rdev
*rdev
)
720 put_page(rdev
->sb_page
);
722 rdev
->sb_page
= NULL
;
727 put_page(rdev
->bb_page
);
728 rdev
->bb_page
= NULL
;
730 badblocks_exit(&rdev
->badblocks
);
732 EXPORT_SYMBOL_GPL(md_rdev_clear
);
734 static void super_written(struct bio
*bio
)
736 struct md_rdev
*rdev
= bio
->bi_private
;
737 struct mddev
*mddev
= rdev
->mddev
;
739 if (bio
->bi_status
) {
740 pr_err("md: super_written gets error=%d\n", bio
->bi_status
);
741 md_error(mddev
, rdev
);
742 if (!test_bit(Faulty
, &rdev
->flags
)
743 && (bio
->bi_opf
& MD_FAILFAST
)) {
744 set_bit(MD_SB_NEED_REWRITE
, &mddev
->sb_flags
);
745 set_bit(LastDev
, &rdev
->flags
);
748 clear_bit(LastDev
, &rdev
->flags
);
750 if (atomic_dec_and_test(&mddev
->pending_writes
))
751 wake_up(&mddev
->sb_wait
);
752 rdev_dec_pending(rdev
, mddev
);
756 void md_super_write(struct mddev
*mddev
, struct md_rdev
*rdev
,
757 sector_t sector
, int size
, struct page
*page
)
759 /* write first size bytes of page to sector of rdev
760 * Increment mddev->pending_writes before returning
761 * and decrement it on completion, waking up sb_wait
762 * if zero is reached.
763 * If an error occurred, call md_error
768 if (test_bit(Faulty
, &rdev
->flags
))
771 bio
= md_bio_alloc_sync(mddev
);
773 atomic_inc(&rdev
->nr_pending
);
775 bio_set_dev(bio
, rdev
->meta_bdev
? rdev
->meta_bdev
: rdev
->bdev
);
776 bio
->bi_iter
.bi_sector
= sector
;
777 bio_add_page(bio
, page
, size
, 0);
778 bio
->bi_private
= rdev
;
779 bio
->bi_end_io
= super_written
;
781 if (test_bit(MD_FAILFAST_SUPPORTED
, &mddev
->flags
) &&
782 test_bit(FailFast
, &rdev
->flags
) &&
783 !test_bit(LastDev
, &rdev
->flags
))
785 bio
->bi_opf
= REQ_OP_WRITE
| REQ_SYNC
| REQ_PREFLUSH
| REQ_FUA
| ff
;
787 atomic_inc(&mddev
->pending_writes
);
791 int md_super_wait(struct mddev
*mddev
)
793 /* wait for all superblock writes that were scheduled to complete */
794 wait_event(mddev
->sb_wait
, atomic_read(&mddev
->pending_writes
)==0);
795 if (test_and_clear_bit(MD_SB_NEED_REWRITE
, &mddev
->sb_flags
))
800 int sync_page_io(struct md_rdev
*rdev
, sector_t sector
, int size
,
801 struct page
*page
, int op
, int op_flags
, bool metadata_op
)
803 struct bio
*bio
= md_bio_alloc_sync(rdev
->mddev
);
806 if (metadata_op
&& rdev
->meta_bdev
)
807 bio_set_dev(bio
, rdev
->meta_bdev
);
809 bio_set_dev(bio
, rdev
->bdev
);
810 bio_set_op_attrs(bio
, op
, op_flags
);
812 bio
->bi_iter
.bi_sector
= sector
+ rdev
->sb_start
;
813 else if (rdev
->mddev
->reshape_position
!= MaxSector
&&
814 (rdev
->mddev
->reshape_backwards
==
815 (sector
>= rdev
->mddev
->reshape_position
)))
816 bio
->bi_iter
.bi_sector
= sector
+ rdev
->new_data_offset
;
818 bio
->bi_iter
.bi_sector
= sector
+ rdev
->data_offset
;
819 bio_add_page(bio
, page
, size
, 0);
821 submit_bio_wait(bio
);
823 ret
= !bio
->bi_status
;
827 EXPORT_SYMBOL_GPL(sync_page_io
);
829 static int read_disk_sb(struct md_rdev
*rdev
, int size
)
831 char b
[BDEVNAME_SIZE
];
836 if (!sync_page_io(rdev
, 0, size
, rdev
->sb_page
, REQ_OP_READ
, 0, true))
842 pr_err("md: disabled device %s, could not read superblock.\n",
843 bdevname(rdev
->bdev
,b
));
847 static int md_uuid_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
849 return sb1
->set_uuid0
== sb2
->set_uuid0
&&
850 sb1
->set_uuid1
== sb2
->set_uuid1
&&
851 sb1
->set_uuid2
== sb2
->set_uuid2
&&
852 sb1
->set_uuid3
== sb2
->set_uuid3
;
855 static int md_sb_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
858 mdp_super_t
*tmp1
, *tmp2
;
860 tmp1
= kmalloc(sizeof(*tmp1
),GFP_KERNEL
);
861 tmp2
= kmalloc(sizeof(*tmp2
),GFP_KERNEL
);
863 if (!tmp1
|| !tmp2
) {
872 * nr_disks is not constant
877 ret
= (memcmp(tmp1
, tmp2
, MD_SB_GENERIC_CONSTANT_WORDS
* 4) == 0);
884 static u32
md_csum_fold(u32 csum
)
886 csum
= (csum
& 0xffff) + (csum
>> 16);
887 return (csum
& 0xffff) + (csum
>> 16);
890 static unsigned int calc_sb_csum(mdp_super_t
*sb
)
893 u32
*sb32
= (u32
*)sb
;
895 unsigned int disk_csum
, csum
;
897 disk_csum
= sb
->sb_csum
;
900 for (i
= 0; i
< MD_SB_BYTES
/4 ; i
++)
902 csum
= (newcsum
& 0xffffffff) + (newcsum
>>32);
905 /* This used to use csum_partial, which was wrong for several
906 * reasons including that different results are returned on
907 * different architectures. It isn't critical that we get exactly
908 * the same return value as before (we always csum_fold before
909 * testing, and that removes any differences). However as we
910 * know that csum_partial always returned a 16bit value on
911 * alphas, do a fold to maximise conformity to previous behaviour.
913 sb
->sb_csum
= md_csum_fold(disk_csum
);
915 sb
->sb_csum
= disk_csum
;
921 * Handle superblock details.
922 * We want to be able to handle multiple superblock formats
923 * so we have a common interface to them all, and an array of
924 * different handlers.
925 * We rely on user-space to write the initial superblock, and support
926 * reading and updating of superblocks.
927 * Interface methods are:
928 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version)
929 * loads and validates a superblock on dev.
930 * if refdev != NULL, compare superblocks on both devices
932 * 0 - dev has a superblock that is compatible with refdev
933 * 1 - dev has a superblock that is compatible and newer than refdev
934 * so dev should be used as the refdev in future
935 * -EINVAL superblock incompatible or invalid
936 * -othererror e.g. -EIO
938 * int validate_super(struct mddev *mddev, struct md_rdev *dev)
939 * Verify that dev is acceptable into mddev.
940 * The first time, mddev->raid_disks will be 0, and data from
941 * dev should be merged in. Subsequent calls check that dev
942 * is new enough. Return 0 or -EINVAL
944 * void sync_super(struct mddev *mddev, struct md_rdev *dev)
945 * Update the superblock for rdev with data in mddev
946 * This does not write to disc.
952 struct module
*owner
;
953 int (*load_super
)(struct md_rdev
*rdev
,
954 struct md_rdev
*refdev
,
956 int (*validate_super
)(struct mddev
*mddev
,
957 struct md_rdev
*rdev
);
958 void (*sync_super
)(struct mddev
*mddev
,
959 struct md_rdev
*rdev
);
960 unsigned long long (*rdev_size_change
)(struct md_rdev
*rdev
,
961 sector_t num_sectors
);
962 int (*allow_new_offset
)(struct md_rdev
*rdev
,
963 unsigned long long new_offset
);
967 * Check that the given mddev has no bitmap.
969 * This function is called from the run method of all personalities that do not
970 * support bitmaps. It prints an error message and returns non-zero if mddev
971 * has a bitmap. Otherwise, it returns 0.
974 int md_check_no_bitmap(struct mddev
*mddev
)
976 if (!mddev
->bitmap_info
.file
&& !mddev
->bitmap_info
.offset
)
978 pr_warn("%s: bitmaps are not supported for %s\n",
979 mdname(mddev
), mddev
->pers
->name
);
982 EXPORT_SYMBOL(md_check_no_bitmap
);
985 * load_super for 0.90.0
987 static int super_90_load(struct md_rdev
*rdev
, struct md_rdev
*refdev
, int minor_version
)
989 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
994 * Calculate the position of the superblock (512byte sectors),
995 * it's at the end of the disk.
997 * It also happens to be a multiple of 4Kb.
999 rdev
->sb_start
= calc_dev_sboffset(rdev
);
1001 ret
= read_disk_sb(rdev
, MD_SB_BYTES
);
1007 bdevname(rdev
->bdev
, b
);
1008 sb
= page_address(rdev
->sb_page
);
1010 if (sb
->md_magic
!= MD_SB_MAGIC
) {
1011 pr_warn("md: invalid raid superblock magic on %s\n", b
);
1015 if (sb
->major_version
!= 0 ||
1016 sb
->minor_version
< 90 ||
1017 sb
->minor_version
> 91) {
1018 pr_warn("Bad version number %d.%d on %s\n",
1019 sb
->major_version
, sb
->minor_version
, b
);
1023 if (sb
->raid_disks
<= 0)
1026 if (md_csum_fold(calc_sb_csum(sb
)) != md_csum_fold(sb
->sb_csum
)) {
1027 pr_warn("md: invalid superblock checksum on %s\n", b
);
1031 rdev
->preferred_minor
= sb
->md_minor
;
1032 rdev
->data_offset
= 0;
1033 rdev
->new_data_offset
= 0;
1034 rdev
->sb_size
= MD_SB_BYTES
;
1035 rdev
->badblocks
.shift
= -1;
1037 if (sb
->level
== LEVEL_MULTIPATH
)
1040 rdev
->desc_nr
= sb
->this_disk
.number
;
1046 mdp_super_t
*refsb
= page_address(refdev
->sb_page
);
1047 if (!md_uuid_equal(refsb
, sb
)) {
1048 pr_warn("md: %s has different UUID to %s\n",
1049 b
, bdevname(refdev
->bdev
,b2
));
1052 if (!md_sb_equal(refsb
, sb
)) {
1053 pr_warn("md: %s has same UUID but different superblock to %s\n",
1054 b
, bdevname(refdev
->bdev
, b2
));
1058 ev2
= md_event(refsb
);
1064 rdev
->sectors
= rdev
->sb_start
;
1065 /* Limit to 4TB as metadata cannot record more than that.
1066 * (not needed for Linear and RAID0 as metadata doesn't
1069 if (IS_ENABLED(CONFIG_LBDAF
) && (u64
)rdev
->sectors
>= (2ULL << 32) &&
1071 rdev
->sectors
= (sector_t
)(2ULL << 32) - 2;
1073 if (rdev
->sectors
< ((sector_t
)sb
->size
) * 2 && sb
->level
>= 1)
1074 /* "this cannot possibly happen" ... */
1082 * validate_super for 0.90.0
1084 static int super_90_validate(struct mddev
*mddev
, struct md_rdev
*rdev
)
1087 mdp_super_t
*sb
= page_address(rdev
->sb_page
);
1088 __u64 ev1
= md_event(sb
);
1090 rdev
->raid_disk
= -1;
1091 clear_bit(Faulty
, &rdev
->flags
);
1092 clear_bit(In_sync
, &rdev
->flags
);
1093 clear_bit(Bitmap_sync
, &rdev
->flags
);
1094 clear_bit(WriteMostly
, &rdev
->flags
);
1096 if (mddev
->raid_disks
== 0) {
1097 mddev
->major_version
= 0;
1098 mddev
->minor_version
= sb
->minor_version
;
1099 mddev
->patch_version
= sb
->patch_version
;
1100 mddev
->external
= 0;
1101 mddev
->chunk_sectors
= sb
->chunk_size
>> 9;
1102 mddev
->ctime
= sb
->ctime
;
1103 mddev
->utime
= sb
->utime
;
1104 mddev
->level
= sb
->level
;
1105 mddev
->clevel
[0] = 0;
1106 mddev
->layout
= sb
->layout
;
1107 mddev
->raid_disks
= sb
->raid_disks
;
1108 mddev
->dev_sectors
= ((sector_t
)sb
->size
) * 2;
1109 mddev
->events
= ev1
;
1110 mddev
->bitmap_info
.offset
= 0;
1111 mddev
->bitmap_info
.space
= 0;
1112 /* bitmap can use 60 K after the 4K superblocks */
1113 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
1114 mddev
->bitmap_info
.default_space
= 64*2 - (MD_SB_BYTES
>> 9);
1115 mddev
->reshape_backwards
= 0;
1117 if (mddev
->minor_version
>= 91) {
1118 mddev
->reshape_position
= sb
->reshape_position
;
1119 mddev
->delta_disks
= sb
->delta_disks
;
1120 mddev
->new_level
= sb
->new_level
;
1121 mddev
->new_layout
= sb
->new_layout
;
1122 mddev
->new_chunk_sectors
= sb
->new_chunk
>> 9;
1123 if (mddev
->delta_disks
< 0)
1124 mddev
->reshape_backwards
= 1;
1126 mddev
->reshape_position
= MaxSector
;
1127 mddev
->delta_disks
= 0;
1128 mddev
->new_level
= mddev
->level
;
1129 mddev
->new_layout
= mddev
->layout
;
1130 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1133 if (sb
->state
& (1<<MD_SB_CLEAN
))
1134 mddev
->recovery_cp
= MaxSector
;
1136 if (sb
->events_hi
== sb
->cp_events_hi
&&
1137 sb
->events_lo
== sb
->cp_events_lo
) {
1138 mddev
->recovery_cp
= sb
->recovery_cp
;
1140 mddev
->recovery_cp
= 0;
1143 memcpy(mddev
->uuid
+0, &sb
->set_uuid0
, 4);
1144 memcpy(mddev
->uuid
+4, &sb
->set_uuid1
, 4);
1145 memcpy(mddev
->uuid
+8, &sb
->set_uuid2
, 4);
1146 memcpy(mddev
->uuid
+12,&sb
->set_uuid3
, 4);
1148 mddev
->max_disks
= MD_SB_DISKS
;
1150 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
) &&
1151 mddev
->bitmap_info
.file
== NULL
) {
1152 mddev
->bitmap_info
.offset
=
1153 mddev
->bitmap_info
.default_offset
;
1154 mddev
->bitmap_info
.space
=
1155 mddev
->bitmap_info
.default_space
;
1158 } else if (mddev
->pers
== NULL
) {
1159 /* Insist on good event counter while assembling, except
1160 * for spares (which don't need an event count) */
1162 if (sb
->disks
[rdev
->desc_nr
].state
& (
1163 (1<<MD_DISK_SYNC
) | (1 << MD_DISK_ACTIVE
)))
1164 if (ev1
< mddev
->events
)
1166 } else if (mddev
->bitmap
) {
1167 /* if adding to array with a bitmap, then we can accept an
1168 * older device ... but not too old.
1170 if (ev1
< mddev
->bitmap
->events_cleared
)
1172 if (ev1
< mddev
->events
)
1173 set_bit(Bitmap_sync
, &rdev
->flags
);
1175 if (ev1
< mddev
->events
)
1176 /* just a hot-add of a new device, leave raid_disk at -1 */
1180 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1181 desc
= sb
->disks
+ rdev
->desc_nr
;
1183 if (desc
->state
& (1<<MD_DISK_FAULTY
))
1184 set_bit(Faulty
, &rdev
->flags
);
1185 else if (desc
->state
& (1<<MD_DISK_SYNC
) /* &&
1186 desc->raid_disk < mddev->raid_disks */) {
1187 set_bit(In_sync
, &rdev
->flags
);
1188 rdev
->raid_disk
= desc
->raid_disk
;
1189 rdev
->saved_raid_disk
= desc
->raid_disk
;
1190 } else if (desc
->state
& (1<<MD_DISK_ACTIVE
)) {
1191 /* active but not in sync implies recovery up to
1192 * reshape position. We don't know exactly where
1193 * that is, so set to zero for now */
1194 if (mddev
->minor_version
>= 91) {
1195 rdev
->recovery_offset
= 0;
1196 rdev
->raid_disk
= desc
->raid_disk
;
1199 if (desc
->state
& (1<<MD_DISK_WRITEMOSTLY
))
1200 set_bit(WriteMostly
, &rdev
->flags
);
1201 if (desc
->state
& (1<<MD_DISK_FAILFAST
))
1202 set_bit(FailFast
, &rdev
->flags
);
1203 } else /* MULTIPATH are always insync */
1204 set_bit(In_sync
, &rdev
->flags
);
1209 * sync_super for 0.90.0
1211 static void super_90_sync(struct mddev
*mddev
, struct md_rdev
*rdev
)
1214 struct md_rdev
*rdev2
;
1215 int next_spare
= mddev
->raid_disks
;
1217 /* make rdev->sb match mddev data..
1220 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1221 * 3/ any empty disks < next_spare become removed
1223 * disks[0] gets initialised to REMOVED because
1224 * we cannot be sure from other fields if it has
1225 * been initialised or not.
1228 int active
=0, working
=0,failed
=0,spare
=0,nr_disks
=0;
1230 rdev
->sb_size
= MD_SB_BYTES
;
1232 sb
= page_address(rdev
->sb_page
);
1234 memset(sb
, 0, sizeof(*sb
));
1236 sb
->md_magic
= MD_SB_MAGIC
;
1237 sb
->major_version
= mddev
->major_version
;
1238 sb
->patch_version
= mddev
->patch_version
;
1239 sb
->gvalid_words
= 0; /* ignored */
1240 memcpy(&sb
->set_uuid0
, mddev
->uuid
+0, 4);
1241 memcpy(&sb
->set_uuid1
, mddev
->uuid
+4, 4);
1242 memcpy(&sb
->set_uuid2
, mddev
->uuid
+8, 4);
1243 memcpy(&sb
->set_uuid3
, mddev
->uuid
+12,4);
1245 sb
->ctime
= clamp_t(time64_t
, mddev
->ctime
, 0, U32_MAX
);
1246 sb
->level
= mddev
->level
;
1247 sb
->size
= mddev
->dev_sectors
/ 2;
1248 sb
->raid_disks
= mddev
->raid_disks
;
1249 sb
->md_minor
= mddev
->md_minor
;
1250 sb
->not_persistent
= 0;
1251 sb
->utime
= clamp_t(time64_t
, mddev
->utime
, 0, U32_MAX
);
1253 sb
->events_hi
= (mddev
->events
>>32);
1254 sb
->events_lo
= (u32
)mddev
->events
;
1256 if (mddev
->reshape_position
== MaxSector
)
1257 sb
->minor_version
= 90;
1259 sb
->minor_version
= 91;
1260 sb
->reshape_position
= mddev
->reshape_position
;
1261 sb
->new_level
= mddev
->new_level
;
1262 sb
->delta_disks
= mddev
->delta_disks
;
1263 sb
->new_layout
= mddev
->new_layout
;
1264 sb
->new_chunk
= mddev
->new_chunk_sectors
<< 9;
1266 mddev
->minor_version
= sb
->minor_version
;
1269 sb
->recovery_cp
= mddev
->recovery_cp
;
1270 sb
->cp_events_hi
= (mddev
->events
>>32);
1271 sb
->cp_events_lo
= (u32
)mddev
->events
;
1272 if (mddev
->recovery_cp
== MaxSector
)
1273 sb
->state
= (1<< MD_SB_CLEAN
);
1275 sb
->recovery_cp
= 0;
1277 sb
->layout
= mddev
->layout
;
1278 sb
->chunk_size
= mddev
->chunk_sectors
<< 9;
1280 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
)
1281 sb
->state
|= (1<<MD_SB_BITMAP_PRESENT
);
1283 sb
->disks
[0].state
= (1<<MD_DISK_REMOVED
);
1284 rdev_for_each(rdev2
, mddev
) {
1287 int is_active
= test_bit(In_sync
, &rdev2
->flags
);
1289 if (rdev2
->raid_disk
>= 0 &&
1290 sb
->minor_version
>= 91)
1291 /* we have nowhere to store the recovery_offset,
1292 * but if it is not below the reshape_position,
1293 * we can piggy-back on that.
1296 if (rdev2
->raid_disk
< 0 ||
1297 test_bit(Faulty
, &rdev2
->flags
))
1300 desc_nr
= rdev2
->raid_disk
;
1302 desc_nr
= next_spare
++;
1303 rdev2
->desc_nr
= desc_nr
;
1304 d
= &sb
->disks
[rdev2
->desc_nr
];
1306 d
->number
= rdev2
->desc_nr
;
1307 d
->major
= MAJOR(rdev2
->bdev
->bd_dev
);
1308 d
->minor
= MINOR(rdev2
->bdev
->bd_dev
);
1310 d
->raid_disk
= rdev2
->raid_disk
;
1312 d
->raid_disk
= rdev2
->desc_nr
; /* compatibility */
1313 if (test_bit(Faulty
, &rdev2
->flags
))
1314 d
->state
= (1<<MD_DISK_FAULTY
);
1315 else if (is_active
) {
1316 d
->state
= (1<<MD_DISK_ACTIVE
);
1317 if (test_bit(In_sync
, &rdev2
->flags
))
1318 d
->state
|= (1<<MD_DISK_SYNC
);
1326 if (test_bit(WriteMostly
, &rdev2
->flags
))
1327 d
->state
|= (1<<MD_DISK_WRITEMOSTLY
);
1328 if (test_bit(FailFast
, &rdev2
->flags
))
1329 d
->state
|= (1<<MD_DISK_FAILFAST
);
1331 /* now set the "removed" and "faulty" bits on any missing devices */
1332 for (i
=0 ; i
< mddev
->raid_disks
; i
++) {
1333 mdp_disk_t
*d
= &sb
->disks
[i
];
1334 if (d
->state
== 0 && d
->number
== 0) {
1337 d
->state
= (1<<MD_DISK_REMOVED
);
1338 d
->state
|= (1<<MD_DISK_FAULTY
);
1342 sb
->nr_disks
= nr_disks
;
1343 sb
->active_disks
= active
;
1344 sb
->working_disks
= working
;
1345 sb
->failed_disks
= failed
;
1346 sb
->spare_disks
= spare
;
1348 sb
->this_disk
= sb
->disks
[rdev
->desc_nr
];
1349 sb
->sb_csum
= calc_sb_csum(sb
);
1353 * rdev_size_change for 0.90.0
1355 static unsigned long long
1356 super_90_rdev_size_change(struct md_rdev
*rdev
, sector_t num_sectors
)
1358 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1359 return 0; /* component must fit device */
1360 if (rdev
->mddev
->bitmap_info
.offset
)
1361 return 0; /* can't move bitmap */
1362 rdev
->sb_start
= calc_dev_sboffset(rdev
);
1363 if (!num_sectors
|| num_sectors
> rdev
->sb_start
)
1364 num_sectors
= rdev
->sb_start
;
1365 /* Limit to 4TB as metadata cannot record more than that.
1366 * 4TB == 2^32 KB, or 2*2^32 sectors.
1368 if (IS_ENABLED(CONFIG_LBDAF
) && (u64
)num_sectors
>= (2ULL << 32) &&
1369 rdev
->mddev
->level
>= 1)
1370 num_sectors
= (sector_t
)(2ULL << 32) - 2;
1372 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1374 } while (md_super_wait(rdev
->mddev
) < 0);
1379 super_90_allow_new_offset(struct md_rdev
*rdev
, unsigned long long new_offset
)
1381 /* non-zero offset changes not possible with v0.90 */
1382 return new_offset
== 0;
1386 * version 1 superblock
1389 static __le32
calc_sb_1_csum(struct mdp_superblock_1
*sb
)
1393 unsigned long long newcsum
;
1394 int size
= 256 + le32_to_cpu(sb
->max_dev
)*2;
1395 __le32
*isuper
= (__le32
*)sb
;
1397 disk_csum
= sb
->sb_csum
;
1400 for (; size
>= 4; size
-= 4)
1401 newcsum
+= le32_to_cpu(*isuper
++);
1404 newcsum
+= le16_to_cpu(*(__le16
*) isuper
);
1406 csum
= (newcsum
& 0xffffffff) + (newcsum
>> 32);
1407 sb
->sb_csum
= disk_csum
;
1408 return cpu_to_le32(csum
);
1411 static int super_1_load(struct md_rdev
*rdev
, struct md_rdev
*refdev
, int minor_version
)
1413 struct mdp_superblock_1
*sb
;
1417 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1421 * Calculate the position of the superblock in 512byte sectors.
1422 * It is always aligned to a 4K boundary and
1423 * depeding on minor_version, it can be:
1424 * 0: At least 8K, but less than 12K, from end of device
1425 * 1: At start of device
1426 * 2: 4K from start of device.
1428 switch(minor_version
) {
1430 sb_start
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1432 sb_start
&= ~(sector_t
)(4*2-1);
1443 rdev
->sb_start
= sb_start
;
1445 /* superblock is rarely larger than 1K, but it can be larger,
1446 * and it is safe to read 4k, so we do that
1448 ret
= read_disk_sb(rdev
, 4096);
1449 if (ret
) return ret
;
1451 sb
= page_address(rdev
->sb_page
);
1453 if (sb
->magic
!= cpu_to_le32(MD_SB_MAGIC
) ||
1454 sb
->major_version
!= cpu_to_le32(1) ||
1455 le32_to_cpu(sb
->max_dev
) > (4096-256)/2 ||
1456 le64_to_cpu(sb
->super_offset
) != rdev
->sb_start
||
1457 (le32_to_cpu(sb
->feature_map
) & ~MD_FEATURE_ALL
) != 0)
1460 if (calc_sb_1_csum(sb
) != sb
->sb_csum
) {
1461 pr_warn("md: invalid superblock checksum on %s\n",
1462 bdevname(rdev
->bdev
,b
));
1465 if (le64_to_cpu(sb
->data_size
) < 10) {
1466 pr_warn("md: data_size too small on %s\n",
1467 bdevname(rdev
->bdev
,b
));
1472 memcmp(sb
->pad3
, sb
->pad3
+1, sizeof(sb
->pad3
) - sizeof(sb
->pad3
[1])))
1473 /* Some padding is non-zero, might be a new feature */
1476 rdev
->preferred_minor
= 0xffff;
1477 rdev
->data_offset
= le64_to_cpu(sb
->data_offset
);
1478 rdev
->new_data_offset
= rdev
->data_offset
;
1479 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
) &&
1480 (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_NEW_OFFSET
))
1481 rdev
->new_data_offset
+= (s32
)le32_to_cpu(sb
->new_offset
);
1482 atomic_set(&rdev
->corrected_errors
, le32_to_cpu(sb
->cnt_corrected_read
));
1484 rdev
->sb_size
= le32_to_cpu(sb
->max_dev
) * 2 + 256;
1485 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1486 if (rdev
->sb_size
& bmask
)
1487 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1490 && rdev
->data_offset
< sb_start
+ (rdev
->sb_size
/512))
1493 && rdev
->new_data_offset
< sb_start
+ (rdev
->sb_size
/512))
1496 if (sb
->level
== cpu_to_le32(LEVEL_MULTIPATH
))
1499 rdev
->desc_nr
= le32_to_cpu(sb
->dev_number
);
1501 if (!rdev
->bb_page
) {
1502 rdev
->bb_page
= alloc_page(GFP_KERNEL
);
1506 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BAD_BLOCKS
) &&
1507 rdev
->badblocks
.count
== 0) {
1508 /* need to load the bad block list.
1509 * Currently we limit it to one page.
1515 int sectors
= le16_to_cpu(sb
->bblog_size
);
1516 if (sectors
> (PAGE_SIZE
/ 512))
1518 offset
= le32_to_cpu(sb
->bblog_offset
);
1521 bb_sector
= (long long)offset
;
1522 if (!sync_page_io(rdev
, bb_sector
, sectors
<< 9,
1523 rdev
->bb_page
, REQ_OP_READ
, 0, true))
1525 bbp
= (u64
*)page_address(rdev
->bb_page
);
1526 rdev
->badblocks
.shift
= sb
->bblog_shift
;
1527 for (i
= 0 ; i
< (sectors
<< (9-3)) ; i
++, bbp
++) {
1528 u64 bb
= le64_to_cpu(*bbp
);
1529 int count
= bb
& (0x3ff);
1530 u64 sector
= bb
>> 10;
1531 sector
<<= sb
->bblog_shift
;
1532 count
<<= sb
->bblog_shift
;
1535 if (badblocks_set(&rdev
->badblocks
, sector
, count
, 1))
1538 } else if (sb
->bblog_offset
!= 0)
1539 rdev
->badblocks
.shift
= 0;
1541 if ((le32_to_cpu(sb
->feature_map
) &
1542 (MD_FEATURE_PPL
| MD_FEATURE_MULTIPLE_PPLS
))) {
1543 rdev
->ppl
.offset
= (__s16
)le16_to_cpu(sb
->ppl
.offset
);
1544 rdev
->ppl
.size
= le16_to_cpu(sb
->ppl
.size
);
1545 rdev
->ppl
.sector
= rdev
->sb_start
+ rdev
->ppl
.offset
;
1552 struct mdp_superblock_1
*refsb
= page_address(refdev
->sb_page
);
1554 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16) != 0 ||
1555 sb
->level
!= refsb
->level
||
1556 sb
->layout
!= refsb
->layout
||
1557 sb
->chunksize
!= refsb
->chunksize
) {
1558 pr_warn("md: %s has strangely different superblock to %s\n",
1559 bdevname(rdev
->bdev
,b
),
1560 bdevname(refdev
->bdev
,b2
));
1563 ev1
= le64_to_cpu(sb
->events
);
1564 ev2
= le64_to_cpu(refsb
->events
);
1571 if (minor_version
) {
1572 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9);
1573 sectors
-= rdev
->data_offset
;
1575 sectors
= rdev
->sb_start
;
1576 if (sectors
< le64_to_cpu(sb
->data_size
))
1578 rdev
->sectors
= le64_to_cpu(sb
->data_size
);
1582 static int super_1_validate(struct mddev
*mddev
, struct md_rdev
*rdev
)
1584 struct mdp_superblock_1
*sb
= page_address(rdev
->sb_page
);
1585 __u64 ev1
= le64_to_cpu(sb
->events
);
1587 rdev
->raid_disk
= -1;
1588 clear_bit(Faulty
, &rdev
->flags
);
1589 clear_bit(In_sync
, &rdev
->flags
);
1590 clear_bit(Bitmap_sync
, &rdev
->flags
);
1591 clear_bit(WriteMostly
, &rdev
->flags
);
1593 if (mddev
->raid_disks
== 0) {
1594 mddev
->major_version
= 1;
1595 mddev
->patch_version
= 0;
1596 mddev
->external
= 0;
1597 mddev
->chunk_sectors
= le32_to_cpu(sb
->chunksize
);
1598 mddev
->ctime
= le64_to_cpu(sb
->ctime
);
1599 mddev
->utime
= le64_to_cpu(sb
->utime
);
1600 mddev
->level
= le32_to_cpu(sb
->level
);
1601 mddev
->clevel
[0] = 0;
1602 mddev
->layout
= le32_to_cpu(sb
->layout
);
1603 mddev
->raid_disks
= le32_to_cpu(sb
->raid_disks
);
1604 mddev
->dev_sectors
= le64_to_cpu(sb
->size
);
1605 mddev
->events
= ev1
;
1606 mddev
->bitmap_info
.offset
= 0;
1607 mddev
->bitmap_info
.space
= 0;
1608 /* Default location for bitmap is 1K after superblock
1609 * using 3K - total of 4K
1611 mddev
->bitmap_info
.default_offset
= 1024 >> 9;
1612 mddev
->bitmap_info
.default_space
= (4096-1024) >> 9;
1613 mddev
->reshape_backwards
= 0;
1615 mddev
->recovery_cp
= le64_to_cpu(sb
->resync_offset
);
1616 memcpy(mddev
->uuid
, sb
->set_uuid
, 16);
1618 mddev
->max_disks
= (4096-256)/2;
1620 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
) &&
1621 mddev
->bitmap_info
.file
== NULL
) {
1622 mddev
->bitmap_info
.offset
=
1623 (__s32
)le32_to_cpu(sb
->bitmap_offset
);
1624 /* Metadata doesn't record how much space is available.
1625 * For 1.0, we assume we can use up to the superblock
1626 * if before, else to 4K beyond superblock.
1627 * For others, assume no change is possible.
1629 if (mddev
->minor_version
> 0)
1630 mddev
->bitmap_info
.space
= 0;
1631 else if (mddev
->bitmap_info
.offset
> 0)
1632 mddev
->bitmap_info
.space
=
1633 8 - mddev
->bitmap_info
.offset
;
1635 mddev
->bitmap_info
.space
=
1636 -mddev
->bitmap_info
.offset
;
1639 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
1640 mddev
->reshape_position
= le64_to_cpu(sb
->reshape_position
);
1641 mddev
->delta_disks
= le32_to_cpu(sb
->delta_disks
);
1642 mddev
->new_level
= le32_to_cpu(sb
->new_level
);
1643 mddev
->new_layout
= le32_to_cpu(sb
->new_layout
);
1644 mddev
->new_chunk_sectors
= le32_to_cpu(sb
->new_chunk
);
1645 if (mddev
->delta_disks
< 0 ||
1646 (mddev
->delta_disks
== 0 &&
1647 (le32_to_cpu(sb
->feature_map
)
1648 & MD_FEATURE_RESHAPE_BACKWARDS
)))
1649 mddev
->reshape_backwards
= 1;
1651 mddev
->reshape_position
= MaxSector
;
1652 mddev
->delta_disks
= 0;
1653 mddev
->new_level
= mddev
->level
;
1654 mddev
->new_layout
= mddev
->layout
;
1655 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1658 if (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_JOURNAL
)
1659 set_bit(MD_HAS_JOURNAL
, &mddev
->flags
);
1661 if (le32_to_cpu(sb
->feature_map
) &
1662 (MD_FEATURE_PPL
| MD_FEATURE_MULTIPLE_PPLS
)) {
1663 if (le32_to_cpu(sb
->feature_map
) &
1664 (MD_FEATURE_BITMAP_OFFSET
| MD_FEATURE_JOURNAL
))
1666 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_PPL
) &&
1667 (le32_to_cpu(sb
->feature_map
) &
1668 MD_FEATURE_MULTIPLE_PPLS
))
1670 set_bit(MD_HAS_PPL
, &mddev
->flags
);
1672 } else if (mddev
->pers
== NULL
) {
1673 /* Insist of good event counter while assembling, except for
1674 * spares (which don't need an event count) */
1676 if (rdev
->desc_nr
>= 0 &&
1677 rdev
->desc_nr
< le32_to_cpu(sb
->max_dev
) &&
1678 (le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]) < MD_DISK_ROLE_MAX
||
1679 le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]) == MD_DISK_ROLE_JOURNAL
))
1680 if (ev1
< mddev
->events
)
1682 } else if (mddev
->bitmap
) {
1683 /* If adding to array with a bitmap, then we can accept an
1684 * older device, but not too old.
1686 if (ev1
< mddev
->bitmap
->events_cleared
)
1688 if (ev1
< mddev
->events
)
1689 set_bit(Bitmap_sync
, &rdev
->flags
);
1691 if (ev1
< mddev
->events
)
1692 /* just a hot-add of a new device, leave raid_disk at -1 */
1695 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1697 if (rdev
->desc_nr
< 0 ||
1698 rdev
->desc_nr
>= le32_to_cpu(sb
->max_dev
)) {
1699 role
= MD_DISK_ROLE_SPARE
;
1702 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
1704 case MD_DISK_ROLE_SPARE
: /* spare */
1706 case MD_DISK_ROLE_FAULTY
: /* faulty */
1707 set_bit(Faulty
, &rdev
->flags
);
1709 case MD_DISK_ROLE_JOURNAL
: /* journal device */
1710 if (!(le32_to_cpu(sb
->feature_map
) & MD_FEATURE_JOURNAL
)) {
1711 /* journal device without journal feature */
1712 pr_warn("md: journal device provided without journal feature, ignoring the device\n");
1715 set_bit(Journal
, &rdev
->flags
);
1716 rdev
->journal_tail
= le64_to_cpu(sb
->journal_tail
);
1717 rdev
->raid_disk
= 0;
1720 rdev
->saved_raid_disk
= role
;
1721 if ((le32_to_cpu(sb
->feature_map
) &
1722 MD_FEATURE_RECOVERY_OFFSET
)) {
1723 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
1724 if (!(le32_to_cpu(sb
->feature_map
) &
1725 MD_FEATURE_RECOVERY_BITMAP
))
1726 rdev
->saved_raid_disk
= -1;
1728 set_bit(In_sync
, &rdev
->flags
);
1729 rdev
->raid_disk
= role
;
1732 if (sb
->devflags
& WriteMostly1
)
1733 set_bit(WriteMostly
, &rdev
->flags
);
1734 if (sb
->devflags
& FailFast1
)
1735 set_bit(FailFast
, &rdev
->flags
);
1736 if (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_REPLACEMENT
)
1737 set_bit(Replacement
, &rdev
->flags
);
1738 } else /* MULTIPATH are always insync */
1739 set_bit(In_sync
, &rdev
->flags
);
1744 static void super_1_sync(struct mddev
*mddev
, struct md_rdev
*rdev
)
1746 struct mdp_superblock_1
*sb
;
1747 struct md_rdev
*rdev2
;
1749 /* make rdev->sb match mddev and rdev data. */
1751 sb
= page_address(rdev
->sb_page
);
1753 sb
->feature_map
= 0;
1755 sb
->recovery_offset
= cpu_to_le64(0);
1756 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
1758 sb
->utime
= cpu_to_le64((__u64
)mddev
->utime
);
1759 sb
->events
= cpu_to_le64(mddev
->events
);
1761 sb
->resync_offset
= cpu_to_le64(mddev
->recovery_cp
);
1762 else if (test_bit(MD_JOURNAL_CLEAN
, &mddev
->flags
))
1763 sb
->resync_offset
= cpu_to_le64(MaxSector
);
1765 sb
->resync_offset
= cpu_to_le64(0);
1767 sb
->cnt_corrected_read
= cpu_to_le32(atomic_read(&rdev
->corrected_errors
));
1769 sb
->raid_disks
= cpu_to_le32(mddev
->raid_disks
);
1770 sb
->size
= cpu_to_le64(mddev
->dev_sectors
);
1771 sb
->chunksize
= cpu_to_le32(mddev
->chunk_sectors
);
1772 sb
->level
= cpu_to_le32(mddev
->level
);
1773 sb
->layout
= cpu_to_le32(mddev
->layout
);
1774 if (test_bit(FailFast
, &rdev
->flags
))
1775 sb
->devflags
|= FailFast1
;
1777 sb
->devflags
&= ~FailFast1
;
1779 if (test_bit(WriteMostly
, &rdev
->flags
))
1780 sb
->devflags
|= WriteMostly1
;
1782 sb
->devflags
&= ~WriteMostly1
;
1783 sb
->data_offset
= cpu_to_le64(rdev
->data_offset
);
1784 sb
->data_size
= cpu_to_le64(rdev
->sectors
);
1786 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
) {
1787 sb
->bitmap_offset
= cpu_to_le32((__u32
)mddev
->bitmap_info
.offset
);
1788 sb
->feature_map
= cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
);
1791 if (rdev
->raid_disk
>= 0 && !test_bit(Journal
, &rdev
->flags
) &&
1792 !test_bit(In_sync
, &rdev
->flags
)) {
1794 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET
);
1795 sb
->recovery_offset
=
1796 cpu_to_le64(rdev
->recovery_offset
);
1797 if (rdev
->saved_raid_disk
>= 0 && mddev
->bitmap
)
1799 cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP
);
1801 /* Note: recovery_offset and journal_tail share space */
1802 if (test_bit(Journal
, &rdev
->flags
))
1803 sb
->journal_tail
= cpu_to_le64(rdev
->journal_tail
);
1804 if (test_bit(Replacement
, &rdev
->flags
))
1806 cpu_to_le32(MD_FEATURE_REPLACEMENT
);
1808 if (mddev
->reshape_position
!= MaxSector
) {
1809 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE
);
1810 sb
->reshape_position
= cpu_to_le64(mddev
->reshape_position
);
1811 sb
->new_layout
= cpu_to_le32(mddev
->new_layout
);
1812 sb
->delta_disks
= cpu_to_le32(mddev
->delta_disks
);
1813 sb
->new_level
= cpu_to_le32(mddev
->new_level
);
1814 sb
->new_chunk
= cpu_to_le32(mddev
->new_chunk_sectors
);
1815 if (mddev
->delta_disks
== 0 &&
1816 mddev
->reshape_backwards
)
1818 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS
);
1819 if (rdev
->new_data_offset
!= rdev
->data_offset
) {
1821 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET
);
1822 sb
->new_offset
= cpu_to_le32((__u32
)(rdev
->new_data_offset
1823 - rdev
->data_offset
));
1827 if (mddev_is_clustered(mddev
))
1828 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_CLUSTERED
);
1830 if (rdev
->badblocks
.count
== 0)
1831 /* Nothing to do for bad blocks*/ ;
1832 else if (sb
->bblog_offset
== 0)
1833 /* Cannot record bad blocks on this device */
1834 md_error(mddev
, rdev
);
1836 struct badblocks
*bb
= &rdev
->badblocks
;
1837 u64
*bbp
= (u64
*)page_address(rdev
->bb_page
);
1839 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_BAD_BLOCKS
);
1844 seq
= read_seqbegin(&bb
->lock
);
1846 memset(bbp
, 0xff, PAGE_SIZE
);
1848 for (i
= 0 ; i
< bb
->count
; i
++) {
1849 u64 internal_bb
= p
[i
];
1850 u64 store_bb
= ((BB_OFFSET(internal_bb
) << 10)
1851 | BB_LEN(internal_bb
));
1852 bbp
[i
] = cpu_to_le64(store_bb
);
1855 if (read_seqretry(&bb
->lock
, seq
))
1858 bb
->sector
= (rdev
->sb_start
+
1859 (int)le32_to_cpu(sb
->bblog_offset
));
1860 bb
->size
= le16_to_cpu(sb
->bblog_size
);
1865 rdev_for_each(rdev2
, mddev
)
1866 if (rdev2
->desc_nr
+1 > max_dev
)
1867 max_dev
= rdev2
->desc_nr
+1;
1869 if (max_dev
> le32_to_cpu(sb
->max_dev
)) {
1871 sb
->max_dev
= cpu_to_le32(max_dev
);
1872 rdev
->sb_size
= max_dev
* 2 + 256;
1873 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1874 if (rdev
->sb_size
& bmask
)
1875 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1877 max_dev
= le32_to_cpu(sb
->max_dev
);
1879 for (i
=0; i
<max_dev
;i
++)
1880 sb
->dev_roles
[i
] = cpu_to_le16(MD_DISK_ROLE_SPARE
);
1882 if (test_bit(MD_HAS_JOURNAL
, &mddev
->flags
))
1883 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_JOURNAL
);
1885 if (test_bit(MD_HAS_PPL
, &mddev
->flags
)) {
1886 if (test_bit(MD_HAS_MULTIPLE_PPLS
, &mddev
->flags
))
1888 cpu_to_le32(MD_FEATURE_MULTIPLE_PPLS
);
1890 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_PPL
);
1891 sb
->ppl
.offset
= cpu_to_le16(rdev
->ppl
.offset
);
1892 sb
->ppl
.size
= cpu_to_le16(rdev
->ppl
.size
);
1895 rdev_for_each(rdev2
, mddev
) {
1897 if (test_bit(Faulty
, &rdev2
->flags
))
1898 sb
->dev_roles
[i
] = cpu_to_le16(MD_DISK_ROLE_FAULTY
);
1899 else if (test_bit(In_sync
, &rdev2
->flags
))
1900 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1901 else if (test_bit(Journal
, &rdev2
->flags
))
1902 sb
->dev_roles
[i
] = cpu_to_le16(MD_DISK_ROLE_JOURNAL
);
1903 else if (rdev2
->raid_disk
>= 0)
1904 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1906 sb
->dev_roles
[i
] = cpu_to_le16(MD_DISK_ROLE_SPARE
);
1909 sb
->sb_csum
= calc_sb_1_csum(sb
);
1912 static unsigned long long
1913 super_1_rdev_size_change(struct md_rdev
*rdev
, sector_t num_sectors
)
1915 struct mdp_superblock_1
*sb
;
1916 sector_t max_sectors
;
1917 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1918 return 0; /* component must fit device */
1919 if (rdev
->data_offset
!= rdev
->new_data_offset
)
1920 return 0; /* too confusing */
1921 if (rdev
->sb_start
< rdev
->data_offset
) {
1922 /* minor versions 1 and 2; superblock before data */
1923 max_sectors
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1924 max_sectors
-= rdev
->data_offset
;
1925 if (!num_sectors
|| num_sectors
> max_sectors
)
1926 num_sectors
= max_sectors
;
1927 } else if (rdev
->mddev
->bitmap_info
.offset
) {
1928 /* minor version 0 with bitmap we can't move */
1931 /* minor version 0; superblock after data */
1933 sb_start
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) - 8*2;
1934 sb_start
&= ~(sector_t
)(4*2 - 1);
1935 max_sectors
= rdev
->sectors
+ sb_start
- rdev
->sb_start
;
1936 if (!num_sectors
|| num_sectors
> max_sectors
)
1937 num_sectors
= max_sectors
;
1938 rdev
->sb_start
= sb_start
;
1940 sb
= page_address(rdev
->sb_page
);
1941 sb
->data_size
= cpu_to_le64(num_sectors
);
1942 sb
->super_offset
= cpu_to_le64(rdev
->sb_start
);
1943 sb
->sb_csum
= calc_sb_1_csum(sb
);
1945 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1947 } while (md_super_wait(rdev
->mddev
) < 0);
1953 super_1_allow_new_offset(struct md_rdev
*rdev
,
1954 unsigned long long new_offset
)
1956 /* All necessary checks on new >= old have been done */
1957 struct bitmap
*bitmap
;
1958 if (new_offset
>= rdev
->data_offset
)
1961 /* with 1.0 metadata, there is no metadata to tread on
1962 * so we can always move back */
1963 if (rdev
->mddev
->minor_version
== 0)
1966 /* otherwise we must be sure not to step on
1967 * any metadata, so stay:
1968 * 36K beyond start of superblock
1969 * beyond end of badblocks
1970 * beyond write-intent bitmap
1972 if (rdev
->sb_start
+ (32+4)*2 > new_offset
)
1974 bitmap
= rdev
->mddev
->bitmap
;
1975 if (bitmap
&& !rdev
->mddev
->bitmap_info
.file
&&
1976 rdev
->sb_start
+ rdev
->mddev
->bitmap_info
.offset
+
1977 bitmap
->storage
.file_pages
* (PAGE_SIZE
>>9) > new_offset
)
1979 if (rdev
->badblocks
.sector
+ rdev
->badblocks
.size
> new_offset
)
1985 static struct super_type super_types
[] = {
1988 .owner
= THIS_MODULE
,
1989 .load_super
= super_90_load
,
1990 .validate_super
= super_90_validate
,
1991 .sync_super
= super_90_sync
,
1992 .rdev_size_change
= super_90_rdev_size_change
,
1993 .allow_new_offset
= super_90_allow_new_offset
,
1997 .owner
= THIS_MODULE
,
1998 .load_super
= super_1_load
,
1999 .validate_super
= super_1_validate
,
2000 .sync_super
= super_1_sync
,
2001 .rdev_size_change
= super_1_rdev_size_change
,
2002 .allow_new_offset
= super_1_allow_new_offset
,
2006 static void sync_super(struct mddev
*mddev
, struct md_rdev
*rdev
)
2008 if (mddev
->sync_super
) {
2009 mddev
->sync_super(mddev
, rdev
);
2013 BUG_ON(mddev
->major_version
>= ARRAY_SIZE(super_types
));
2015 super_types
[mddev
->major_version
].sync_super(mddev
, rdev
);
2018 static int match_mddev_units(struct mddev
*mddev1
, struct mddev
*mddev2
)
2020 struct md_rdev
*rdev
, *rdev2
;
2023 rdev_for_each_rcu(rdev
, mddev1
) {
2024 if (test_bit(Faulty
, &rdev
->flags
) ||
2025 test_bit(Journal
, &rdev
->flags
) ||
2026 rdev
->raid_disk
== -1)
2028 rdev_for_each_rcu(rdev2
, mddev2
) {
2029 if (test_bit(Faulty
, &rdev2
->flags
) ||
2030 test_bit(Journal
, &rdev2
->flags
) ||
2031 rdev2
->raid_disk
== -1)
2033 if (rdev
->bdev
->bd_contains
==
2034 rdev2
->bdev
->bd_contains
) {
2044 static LIST_HEAD(pending_raid_disks
);
2047 * Try to register data integrity profile for an mddev
2049 * This is called when an array is started and after a disk has been kicked
2050 * from the array. It only succeeds if all working and active component devices
2051 * are integrity capable with matching profiles.
2053 int md_integrity_register(struct mddev
*mddev
)
2055 struct md_rdev
*rdev
, *reference
= NULL
;
2057 if (list_empty(&mddev
->disks
))
2058 return 0; /* nothing to do */
2059 if (!mddev
->gendisk
|| blk_get_integrity(mddev
->gendisk
))
2060 return 0; /* shouldn't register, or already is */
2061 rdev_for_each(rdev
, mddev
) {
2062 /* skip spares and non-functional disks */
2063 if (test_bit(Faulty
, &rdev
->flags
))
2065 if (rdev
->raid_disk
< 0)
2068 /* Use the first rdev as the reference */
2072 /* does this rdev's profile match the reference profile? */
2073 if (blk_integrity_compare(reference
->bdev
->bd_disk
,
2074 rdev
->bdev
->bd_disk
) < 0)
2077 if (!reference
|| !bdev_get_integrity(reference
->bdev
))
2080 * All component devices are integrity capable and have matching
2081 * profiles, register the common profile for the md device.
2083 blk_integrity_register(mddev
->gendisk
,
2084 bdev_get_integrity(reference
->bdev
));
2086 pr_debug("md: data integrity enabled on %s\n", mdname(mddev
));
2087 if (bioset_integrity_create(mddev
->bio_set
, BIO_POOL_SIZE
)) {
2088 pr_err("md: failed to create integrity pool for %s\n",
2094 EXPORT_SYMBOL(md_integrity_register
);
2097 * Attempt to add an rdev, but only if it is consistent with the current
2100 int md_integrity_add_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
2102 struct blk_integrity
*bi_rdev
;
2103 struct blk_integrity
*bi_mddev
;
2104 char name
[BDEVNAME_SIZE
];
2106 if (!mddev
->gendisk
)
2109 bi_rdev
= bdev_get_integrity(rdev
->bdev
);
2110 bi_mddev
= blk_get_integrity(mddev
->gendisk
);
2112 if (!bi_mddev
) /* nothing to do */
2115 if (blk_integrity_compare(mddev
->gendisk
, rdev
->bdev
->bd_disk
) != 0) {
2116 pr_err("%s: incompatible integrity profile for %s\n",
2117 mdname(mddev
), bdevname(rdev
->bdev
, name
));
2123 EXPORT_SYMBOL(md_integrity_add_rdev
);
2125 static int bind_rdev_to_array(struct md_rdev
*rdev
, struct mddev
*mddev
)
2127 char b
[BDEVNAME_SIZE
];
2131 /* prevent duplicates */
2132 if (find_rdev(mddev
, rdev
->bdev
->bd_dev
))
2135 if ((bdev_read_only(rdev
->bdev
) || bdev_read_only(rdev
->meta_bdev
)) &&
2139 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2140 if (!test_bit(Journal
, &rdev
->flags
) &&
2142 (mddev
->dev_sectors
== 0 || rdev
->sectors
< mddev
->dev_sectors
)) {
2144 /* Cannot change size, so fail
2145 * If mddev->level <= 0, then we don't care
2146 * about aligning sizes (e.g. linear)
2148 if (mddev
->level
> 0)
2151 mddev
->dev_sectors
= rdev
->sectors
;
2154 /* Verify rdev->desc_nr is unique.
2155 * If it is -1, assign a free number, else
2156 * check number is not in use
2159 if (rdev
->desc_nr
< 0) {
2162 choice
= mddev
->raid_disks
;
2163 while (md_find_rdev_nr_rcu(mddev
, choice
))
2165 rdev
->desc_nr
= choice
;
2167 if (md_find_rdev_nr_rcu(mddev
, rdev
->desc_nr
)) {
2173 if (!test_bit(Journal
, &rdev
->flags
) &&
2174 mddev
->max_disks
&& rdev
->desc_nr
>= mddev
->max_disks
) {
2175 pr_warn("md: %s: array is limited to %d devices\n",
2176 mdname(mddev
), mddev
->max_disks
);
2179 bdevname(rdev
->bdev
,b
);
2180 strreplace(b
, '/', '!');
2182 rdev
->mddev
= mddev
;
2183 pr_debug("md: bind<%s>\n", b
);
2185 if ((err
= kobject_add(&rdev
->kobj
, &mddev
->kobj
, "dev-%s", b
)))
2188 ko
= &part_to_dev(rdev
->bdev
->bd_part
)->kobj
;
2189 if (sysfs_create_link(&rdev
->kobj
, ko
, "block"))
2190 /* failure here is OK */;
2191 rdev
->sysfs_state
= sysfs_get_dirent_safe(rdev
->kobj
.sd
, "state");
2193 list_add_rcu(&rdev
->same_set
, &mddev
->disks
);
2194 bd_link_disk_holder(rdev
->bdev
, mddev
->gendisk
);
2196 /* May as well allow recovery to be retried once */
2197 mddev
->recovery_disabled
++;
2202 pr_warn("md: failed to register dev-%s for %s\n",
2207 static void md_delayed_delete(struct work_struct
*ws
)
2209 struct md_rdev
*rdev
= container_of(ws
, struct md_rdev
, del_work
);
2210 kobject_del(&rdev
->kobj
);
2211 kobject_put(&rdev
->kobj
);
2214 static void unbind_rdev_from_array(struct md_rdev
*rdev
)
2216 char b
[BDEVNAME_SIZE
];
2218 bd_unlink_disk_holder(rdev
->bdev
, rdev
->mddev
->gendisk
);
2219 list_del_rcu(&rdev
->same_set
);
2220 pr_debug("md: unbind<%s>\n", bdevname(rdev
->bdev
,b
));
2222 sysfs_remove_link(&rdev
->kobj
, "block");
2223 sysfs_put(rdev
->sysfs_state
);
2224 rdev
->sysfs_state
= NULL
;
2225 rdev
->badblocks
.count
= 0;
2226 /* We need to delay this, otherwise we can deadlock when
2227 * writing to 'remove' to "dev/state". We also need
2228 * to delay it due to rcu usage.
2231 INIT_WORK(&rdev
->del_work
, md_delayed_delete
);
2232 kobject_get(&rdev
->kobj
);
2233 queue_work(md_misc_wq
, &rdev
->del_work
);
2237 * prevent the device from being mounted, repartitioned or
2238 * otherwise reused by a RAID array (or any other kernel
2239 * subsystem), by bd_claiming the device.
2241 static int lock_rdev(struct md_rdev
*rdev
, dev_t dev
, int shared
)
2244 struct block_device
*bdev
;
2245 char b
[BDEVNAME_SIZE
];
2247 bdev
= blkdev_get_by_dev(dev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
,
2248 shared
? (struct md_rdev
*)lock_rdev
: rdev
);
2250 pr_warn("md: could not open %s.\n", __bdevname(dev
, b
));
2251 return PTR_ERR(bdev
);
2257 static void unlock_rdev(struct md_rdev
*rdev
)
2259 struct block_device
*bdev
= rdev
->bdev
;
2261 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
);
2264 void md_autodetect_dev(dev_t dev
);
2266 static void export_rdev(struct md_rdev
*rdev
)
2268 char b
[BDEVNAME_SIZE
];
2270 pr_debug("md: export_rdev(%s)\n", bdevname(rdev
->bdev
,b
));
2271 md_rdev_clear(rdev
);
2273 if (test_bit(AutoDetected
, &rdev
->flags
))
2274 md_autodetect_dev(rdev
->bdev
->bd_dev
);
2277 kobject_put(&rdev
->kobj
);
2280 void md_kick_rdev_from_array(struct md_rdev
*rdev
)
2282 unbind_rdev_from_array(rdev
);
2285 EXPORT_SYMBOL_GPL(md_kick_rdev_from_array
);
2287 static void export_array(struct mddev
*mddev
)
2289 struct md_rdev
*rdev
;
2291 while (!list_empty(&mddev
->disks
)) {
2292 rdev
= list_first_entry(&mddev
->disks
, struct md_rdev
,
2294 md_kick_rdev_from_array(rdev
);
2296 mddev
->raid_disks
= 0;
2297 mddev
->major_version
= 0;
2300 static bool set_in_sync(struct mddev
*mddev
)
2302 WARN_ON_ONCE(NR_CPUS
!= 1 && !spin_is_locked(&mddev
->lock
));
2303 if (!mddev
->in_sync
) {
2304 mddev
->sync_checkers
++;
2305 spin_unlock(&mddev
->lock
);
2306 percpu_ref_switch_to_atomic_sync(&mddev
->writes_pending
);
2307 spin_lock(&mddev
->lock
);
2308 if (!mddev
->in_sync
&&
2309 percpu_ref_is_zero(&mddev
->writes_pending
)) {
2312 * Ensure ->in_sync is visible before we clear
2316 set_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
2317 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
2319 if (--mddev
->sync_checkers
== 0)
2320 percpu_ref_switch_to_percpu(&mddev
->writes_pending
);
2322 if (mddev
->safemode
== 1)
2323 mddev
->safemode
= 0;
2324 return mddev
->in_sync
;
2327 static void sync_sbs(struct mddev
*mddev
, int nospares
)
2329 /* Update each superblock (in-memory image), but
2330 * if we are allowed to, skip spares which already
2331 * have the right event counter, or have one earlier
2332 * (which would mean they aren't being marked as dirty
2333 * with the rest of the array)
2335 struct md_rdev
*rdev
;
2336 rdev_for_each(rdev
, mddev
) {
2337 if (rdev
->sb_events
== mddev
->events
||
2339 rdev
->raid_disk
< 0 &&
2340 rdev
->sb_events
+1 == mddev
->events
)) {
2341 /* Don't update this superblock */
2342 rdev
->sb_loaded
= 2;
2344 sync_super(mddev
, rdev
);
2345 rdev
->sb_loaded
= 1;
2350 static bool does_sb_need_changing(struct mddev
*mddev
)
2352 struct md_rdev
*rdev
;
2353 struct mdp_superblock_1
*sb
;
2356 /* Find a good rdev */
2357 rdev_for_each(rdev
, mddev
)
2358 if ((rdev
->raid_disk
>= 0) && !test_bit(Faulty
, &rdev
->flags
))
2361 /* No good device found. */
2365 sb
= page_address(rdev
->sb_page
);
2366 /* Check if a device has become faulty or a spare become active */
2367 rdev_for_each(rdev
, mddev
) {
2368 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
2369 /* Device activated? */
2370 if (role
== 0xffff && rdev
->raid_disk
>=0 &&
2371 !test_bit(Faulty
, &rdev
->flags
))
2373 /* Device turned faulty? */
2374 if (test_bit(Faulty
, &rdev
->flags
) && (role
< 0xfffd))
2378 /* Check if any mddev parameters have changed */
2379 if ((mddev
->dev_sectors
!= le64_to_cpu(sb
->size
)) ||
2380 (mddev
->reshape_position
!= le64_to_cpu(sb
->reshape_position
)) ||
2381 (mddev
->layout
!= le32_to_cpu(sb
->layout
)) ||
2382 (mddev
->raid_disks
!= le32_to_cpu(sb
->raid_disks
)) ||
2383 (mddev
->chunk_sectors
!= le32_to_cpu(sb
->chunksize
)))
2389 void md_update_sb(struct mddev
*mddev
, int force_change
)
2391 struct md_rdev
*rdev
;
2394 int any_badblocks_changed
= 0;
2399 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
2404 if (mddev_is_clustered(mddev
)) {
2405 if (test_and_clear_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
))
2407 if (test_and_clear_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
))
2409 ret
= md_cluster_ops
->metadata_update_start(mddev
);
2410 /* Has someone else has updated the sb */
2411 if (!does_sb_need_changing(mddev
)) {
2413 md_cluster_ops
->metadata_update_cancel(mddev
);
2414 bit_clear_unless(&mddev
->sb_flags
, BIT(MD_SB_CHANGE_PENDING
),
2415 BIT(MD_SB_CHANGE_DEVS
) |
2416 BIT(MD_SB_CHANGE_CLEAN
));
2421 /* First make sure individual recovery_offsets are correct */
2422 rdev_for_each(rdev
, mddev
) {
2423 if (rdev
->raid_disk
>= 0 &&
2424 mddev
->delta_disks
>= 0 &&
2425 !test_bit(Journal
, &rdev
->flags
) &&
2426 !test_bit(In_sync
, &rdev
->flags
) &&
2427 mddev
->curr_resync_completed
> rdev
->recovery_offset
)
2428 rdev
->recovery_offset
= mddev
->curr_resync_completed
;
2431 if (!mddev
->persistent
) {
2432 clear_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
2433 clear_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
2434 if (!mddev
->external
) {
2435 clear_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
2436 rdev_for_each(rdev
, mddev
) {
2437 if (rdev
->badblocks
.changed
) {
2438 rdev
->badblocks
.changed
= 0;
2439 ack_all_badblocks(&rdev
->badblocks
);
2440 md_error(mddev
, rdev
);
2442 clear_bit(Blocked
, &rdev
->flags
);
2443 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2444 wake_up(&rdev
->blocked_wait
);
2447 wake_up(&mddev
->sb_wait
);
2451 spin_lock(&mddev
->lock
);
2453 mddev
->utime
= ktime_get_real_seconds();
2455 if (test_and_clear_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
))
2457 if (test_and_clear_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
))
2458 /* just a clean<-> dirty transition, possibly leave spares alone,
2459 * though if events isn't the right even/odd, we will have to do
2465 if (mddev
->degraded
)
2466 /* If the array is degraded, then skipping spares is both
2467 * dangerous and fairly pointless.
2468 * Dangerous because a device that was removed from the array
2469 * might have a event_count that still looks up-to-date,
2470 * so it can be re-added without a resync.
2471 * Pointless because if there are any spares to skip,
2472 * then a recovery will happen and soon that array won't
2473 * be degraded any more and the spare can go back to sleep then.
2477 sync_req
= mddev
->in_sync
;
2479 /* If this is just a dirty<->clean transition, and the array is clean
2480 * and 'events' is odd, we can roll back to the previous clean state */
2482 && (mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
2483 && mddev
->can_decrease_events
2484 && mddev
->events
!= 1) {
2486 mddev
->can_decrease_events
= 0;
2488 /* otherwise we have to go forward and ... */
2490 mddev
->can_decrease_events
= nospares
;
2494 * This 64-bit counter should never wrap.
2495 * Either we are in around ~1 trillion A.C., assuming
2496 * 1 reboot per second, or we have a bug...
2498 WARN_ON(mddev
->events
== 0);
2500 rdev_for_each(rdev
, mddev
) {
2501 if (rdev
->badblocks
.changed
)
2502 any_badblocks_changed
++;
2503 if (test_bit(Faulty
, &rdev
->flags
))
2504 set_bit(FaultRecorded
, &rdev
->flags
);
2507 sync_sbs(mddev
, nospares
);
2508 spin_unlock(&mddev
->lock
);
2510 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2511 mdname(mddev
), mddev
->in_sync
);
2514 blk_add_trace_msg(mddev
->queue
, "md md_update_sb");
2516 bitmap_update_sb(mddev
->bitmap
);
2517 rdev_for_each(rdev
, mddev
) {
2518 char b
[BDEVNAME_SIZE
];
2520 if (rdev
->sb_loaded
!= 1)
2521 continue; /* no noise on spare devices */
2523 if (!test_bit(Faulty
, &rdev
->flags
)) {
2524 md_super_write(mddev
,rdev
,
2525 rdev
->sb_start
, rdev
->sb_size
,
2527 pr_debug("md: (write) %s's sb offset: %llu\n",
2528 bdevname(rdev
->bdev
, b
),
2529 (unsigned long long)rdev
->sb_start
);
2530 rdev
->sb_events
= mddev
->events
;
2531 if (rdev
->badblocks
.size
) {
2532 md_super_write(mddev
, rdev
,
2533 rdev
->badblocks
.sector
,
2534 rdev
->badblocks
.size
<< 9,
2536 rdev
->badblocks
.size
= 0;
2540 pr_debug("md: %s (skipping faulty)\n",
2541 bdevname(rdev
->bdev
, b
));
2543 if (mddev
->level
== LEVEL_MULTIPATH
)
2544 /* only need to write one superblock... */
2547 if (md_super_wait(mddev
) < 0)
2549 /* if there was a failure, MD_SB_CHANGE_DEVS was set, and we re-write super */
2551 if (mddev_is_clustered(mddev
) && ret
== 0)
2552 md_cluster_ops
->metadata_update_finish(mddev
);
2554 if (mddev
->in_sync
!= sync_req
||
2555 !bit_clear_unless(&mddev
->sb_flags
, BIT(MD_SB_CHANGE_PENDING
),
2556 BIT(MD_SB_CHANGE_DEVS
) | BIT(MD_SB_CHANGE_CLEAN
)))
2557 /* have to write it out again */
2559 wake_up(&mddev
->sb_wait
);
2560 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
2561 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
2563 rdev_for_each(rdev
, mddev
) {
2564 if (test_and_clear_bit(FaultRecorded
, &rdev
->flags
))
2565 clear_bit(Blocked
, &rdev
->flags
);
2567 if (any_badblocks_changed
)
2568 ack_all_badblocks(&rdev
->badblocks
);
2569 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2570 wake_up(&rdev
->blocked_wait
);
2573 EXPORT_SYMBOL(md_update_sb
);
2575 static int add_bound_rdev(struct md_rdev
*rdev
)
2577 struct mddev
*mddev
= rdev
->mddev
;
2579 bool add_journal
= test_bit(Journal
, &rdev
->flags
);
2581 if (!mddev
->pers
->hot_remove_disk
|| add_journal
) {
2582 /* If there is hot_add_disk but no hot_remove_disk
2583 * then added disks for geometry changes,
2584 * and should be added immediately.
2586 super_types
[mddev
->major_version
].
2587 validate_super(mddev
, rdev
);
2589 mddev_suspend(mddev
);
2590 err
= mddev
->pers
->hot_add_disk(mddev
, rdev
);
2592 mddev_resume(mddev
);
2594 md_kick_rdev_from_array(rdev
);
2598 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2600 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
2601 if (mddev
->degraded
)
2602 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
2603 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
2604 md_new_event(mddev
);
2605 md_wakeup_thread(mddev
->thread
);
2609 /* words written to sysfs files may, or may not, be \n terminated.
2610 * We want to accept with case. For this we use cmd_match.
2612 static int cmd_match(const char *cmd
, const char *str
)
2614 /* See if cmd, written into a sysfs file, matches
2615 * str. They must either be the same, or cmd can
2616 * have a trailing newline
2618 while (*cmd
&& *str
&& *cmd
== *str
) {
2629 struct rdev_sysfs_entry
{
2630 struct attribute attr
;
2631 ssize_t (*show
)(struct md_rdev
*, char *);
2632 ssize_t (*store
)(struct md_rdev
*, const char *, size_t);
2636 state_show(struct md_rdev
*rdev
, char *page
)
2640 unsigned long flags
= ACCESS_ONCE(rdev
->flags
);
2642 if (test_bit(Faulty
, &flags
) ||
2643 (!test_bit(ExternalBbl
, &flags
) &&
2644 rdev
->badblocks
.unacked_exist
))
2645 len
+= sprintf(page
+len
, "faulty%s", sep
);
2646 if (test_bit(In_sync
, &flags
))
2647 len
+= sprintf(page
+len
, "in_sync%s", sep
);
2648 if (test_bit(Journal
, &flags
))
2649 len
+= sprintf(page
+len
, "journal%s", sep
);
2650 if (test_bit(WriteMostly
, &flags
))
2651 len
+= sprintf(page
+len
, "write_mostly%s", sep
);
2652 if (test_bit(Blocked
, &flags
) ||
2653 (rdev
->badblocks
.unacked_exist
2654 && !test_bit(Faulty
, &flags
)))
2655 len
+= sprintf(page
+len
, "blocked%s", sep
);
2656 if (!test_bit(Faulty
, &flags
) &&
2657 !test_bit(Journal
, &flags
) &&
2658 !test_bit(In_sync
, &flags
))
2659 len
+= sprintf(page
+len
, "spare%s", sep
);
2660 if (test_bit(WriteErrorSeen
, &flags
))
2661 len
+= sprintf(page
+len
, "write_error%s", sep
);
2662 if (test_bit(WantReplacement
, &flags
))
2663 len
+= sprintf(page
+len
, "want_replacement%s", sep
);
2664 if (test_bit(Replacement
, &flags
))
2665 len
+= sprintf(page
+len
, "replacement%s", sep
);
2666 if (test_bit(ExternalBbl
, &flags
))
2667 len
+= sprintf(page
+len
, "external_bbl%s", sep
);
2668 if (test_bit(FailFast
, &flags
))
2669 len
+= sprintf(page
+len
, "failfast%s", sep
);
2674 return len
+sprintf(page
+len
, "\n");
2678 state_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2681 * faulty - simulates an error
2682 * remove - disconnects the device
2683 * writemostly - sets write_mostly
2684 * -writemostly - clears write_mostly
2685 * blocked - sets the Blocked flags
2686 * -blocked - clears the Blocked and possibly simulates an error
2687 * insync - sets Insync providing device isn't active
2688 * -insync - clear Insync for a device with a slot assigned,
2689 * so that it gets rebuilt based on bitmap
2690 * write_error - sets WriteErrorSeen
2691 * -write_error - clears WriteErrorSeen
2692 * {,-}failfast - set/clear FailFast
2695 if (cmd_match(buf
, "faulty") && rdev
->mddev
->pers
) {
2696 md_error(rdev
->mddev
, rdev
);
2697 if (test_bit(Faulty
, &rdev
->flags
))
2701 } else if (cmd_match(buf
, "remove")) {
2702 if (rdev
->mddev
->pers
) {
2703 clear_bit(Blocked
, &rdev
->flags
);
2704 remove_and_add_spares(rdev
->mddev
, rdev
);
2706 if (rdev
->raid_disk
>= 0)
2709 struct mddev
*mddev
= rdev
->mddev
;
2711 if (mddev_is_clustered(mddev
))
2712 err
= md_cluster_ops
->remove_disk(mddev
, rdev
);
2715 md_kick_rdev_from_array(rdev
);
2717 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
2718 md_wakeup_thread(mddev
->thread
);
2720 md_new_event(mddev
);
2723 } else if (cmd_match(buf
, "writemostly")) {
2724 set_bit(WriteMostly
, &rdev
->flags
);
2726 } else if (cmd_match(buf
, "-writemostly")) {
2727 clear_bit(WriteMostly
, &rdev
->flags
);
2729 } else if (cmd_match(buf
, "blocked")) {
2730 set_bit(Blocked
, &rdev
->flags
);
2732 } else if (cmd_match(buf
, "-blocked")) {
2733 if (!test_bit(Faulty
, &rdev
->flags
) &&
2734 !test_bit(ExternalBbl
, &rdev
->flags
) &&
2735 rdev
->badblocks
.unacked_exist
) {
2736 /* metadata handler doesn't understand badblocks,
2737 * so we need to fail the device
2739 md_error(rdev
->mddev
, rdev
);
2741 clear_bit(Blocked
, &rdev
->flags
);
2742 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2743 wake_up(&rdev
->blocked_wait
);
2744 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2745 md_wakeup_thread(rdev
->mddev
->thread
);
2748 } else if (cmd_match(buf
, "insync") && rdev
->raid_disk
== -1) {
2749 set_bit(In_sync
, &rdev
->flags
);
2751 } else if (cmd_match(buf
, "failfast")) {
2752 set_bit(FailFast
, &rdev
->flags
);
2754 } else if (cmd_match(buf
, "-failfast")) {
2755 clear_bit(FailFast
, &rdev
->flags
);
2757 } else if (cmd_match(buf
, "-insync") && rdev
->raid_disk
>= 0 &&
2758 !test_bit(Journal
, &rdev
->flags
)) {
2759 if (rdev
->mddev
->pers
== NULL
) {
2760 clear_bit(In_sync
, &rdev
->flags
);
2761 rdev
->saved_raid_disk
= rdev
->raid_disk
;
2762 rdev
->raid_disk
= -1;
2765 } else if (cmd_match(buf
, "write_error")) {
2766 set_bit(WriteErrorSeen
, &rdev
->flags
);
2768 } else if (cmd_match(buf
, "-write_error")) {
2769 clear_bit(WriteErrorSeen
, &rdev
->flags
);
2771 } else if (cmd_match(buf
, "want_replacement")) {
2772 /* Any non-spare device that is not a replacement can
2773 * become want_replacement at any time, but we then need to
2774 * check if recovery is needed.
2776 if (rdev
->raid_disk
>= 0 &&
2777 !test_bit(Journal
, &rdev
->flags
) &&
2778 !test_bit(Replacement
, &rdev
->flags
))
2779 set_bit(WantReplacement
, &rdev
->flags
);
2780 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2781 md_wakeup_thread(rdev
->mddev
->thread
);
2783 } else if (cmd_match(buf
, "-want_replacement")) {
2784 /* Clearing 'want_replacement' is always allowed.
2785 * Once replacements starts it is too late though.
2788 clear_bit(WantReplacement
, &rdev
->flags
);
2789 } else if (cmd_match(buf
, "replacement")) {
2790 /* Can only set a device as a replacement when array has not
2791 * yet been started. Once running, replacement is automatic
2792 * from spares, or by assigning 'slot'.
2794 if (rdev
->mddev
->pers
)
2797 set_bit(Replacement
, &rdev
->flags
);
2800 } else if (cmd_match(buf
, "-replacement")) {
2801 /* Similarly, can only clear Replacement before start */
2802 if (rdev
->mddev
->pers
)
2805 clear_bit(Replacement
, &rdev
->flags
);
2808 } else if (cmd_match(buf
, "re-add")) {
2809 if (test_bit(Faulty
, &rdev
->flags
) && (rdev
->raid_disk
== -1)) {
2810 /* clear_bit is performed _after_ all the devices
2811 * have their local Faulty bit cleared. If any writes
2812 * happen in the meantime in the local node, they
2813 * will land in the local bitmap, which will be synced
2814 * by this node eventually
2816 if (!mddev_is_clustered(rdev
->mddev
) ||
2817 (err
= md_cluster_ops
->gather_bitmaps(rdev
)) == 0) {
2818 clear_bit(Faulty
, &rdev
->flags
);
2819 err
= add_bound_rdev(rdev
);
2823 } else if (cmd_match(buf
, "external_bbl") && (rdev
->mddev
->external
)) {
2824 set_bit(ExternalBbl
, &rdev
->flags
);
2825 rdev
->badblocks
.shift
= 0;
2827 } else if (cmd_match(buf
, "-external_bbl") && (rdev
->mddev
->external
)) {
2828 clear_bit(ExternalBbl
, &rdev
->flags
);
2832 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2833 return err
? err
: len
;
2835 static struct rdev_sysfs_entry rdev_state
=
2836 __ATTR_PREALLOC(state
, S_IRUGO
|S_IWUSR
, state_show
, state_store
);
2839 errors_show(struct md_rdev
*rdev
, char *page
)
2841 return sprintf(page
, "%d\n", atomic_read(&rdev
->corrected_errors
));
2845 errors_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2850 rv
= kstrtouint(buf
, 10, &n
);
2853 atomic_set(&rdev
->corrected_errors
, n
);
2856 static struct rdev_sysfs_entry rdev_errors
=
2857 __ATTR(errors
, S_IRUGO
|S_IWUSR
, errors_show
, errors_store
);
2860 slot_show(struct md_rdev
*rdev
, char *page
)
2862 if (test_bit(Journal
, &rdev
->flags
))
2863 return sprintf(page
, "journal\n");
2864 else if (rdev
->raid_disk
< 0)
2865 return sprintf(page
, "none\n");
2867 return sprintf(page
, "%d\n", rdev
->raid_disk
);
2871 slot_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2876 if (test_bit(Journal
, &rdev
->flags
))
2878 if (strncmp(buf
, "none", 4)==0)
2881 err
= kstrtouint(buf
, 10, (unsigned int *)&slot
);
2885 if (rdev
->mddev
->pers
&& slot
== -1) {
2886 /* Setting 'slot' on an active array requires also
2887 * updating the 'rd%d' link, and communicating
2888 * with the personality with ->hot_*_disk.
2889 * For now we only support removing
2890 * failed/spare devices. This normally happens automatically,
2891 * but not when the metadata is externally managed.
2893 if (rdev
->raid_disk
== -1)
2895 /* personality does all needed checks */
2896 if (rdev
->mddev
->pers
->hot_remove_disk
== NULL
)
2898 clear_bit(Blocked
, &rdev
->flags
);
2899 remove_and_add_spares(rdev
->mddev
, rdev
);
2900 if (rdev
->raid_disk
>= 0)
2902 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2903 md_wakeup_thread(rdev
->mddev
->thread
);
2904 } else if (rdev
->mddev
->pers
) {
2905 /* Activating a spare .. or possibly reactivating
2906 * if we ever get bitmaps working here.
2910 if (rdev
->raid_disk
!= -1)
2913 if (test_bit(MD_RECOVERY_RUNNING
, &rdev
->mddev
->recovery
))
2916 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
2919 if (slot
>= rdev
->mddev
->raid_disks
&&
2920 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
2923 rdev
->raid_disk
= slot
;
2924 if (test_bit(In_sync
, &rdev
->flags
))
2925 rdev
->saved_raid_disk
= slot
;
2927 rdev
->saved_raid_disk
= -1;
2928 clear_bit(In_sync
, &rdev
->flags
);
2929 clear_bit(Bitmap_sync
, &rdev
->flags
);
2930 err
= rdev
->mddev
->pers
->
2931 hot_add_disk(rdev
->mddev
, rdev
);
2933 rdev
->raid_disk
= -1;
2936 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2937 if (sysfs_link_rdev(rdev
->mddev
, rdev
))
2938 /* failure here is OK */;
2939 /* don't wakeup anyone, leave that to userspace. */
2941 if (slot
>= rdev
->mddev
->raid_disks
&&
2942 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
2944 rdev
->raid_disk
= slot
;
2945 /* assume it is working */
2946 clear_bit(Faulty
, &rdev
->flags
);
2947 clear_bit(WriteMostly
, &rdev
->flags
);
2948 set_bit(In_sync
, &rdev
->flags
);
2949 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2954 static struct rdev_sysfs_entry rdev_slot
=
2955 __ATTR(slot
, S_IRUGO
|S_IWUSR
, slot_show
, slot_store
);
2958 offset_show(struct md_rdev
*rdev
, char *page
)
2960 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->data_offset
);
2964 offset_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2966 unsigned long long offset
;
2967 if (kstrtoull(buf
, 10, &offset
) < 0)
2969 if (rdev
->mddev
->pers
&& rdev
->raid_disk
>= 0)
2971 if (rdev
->sectors
&& rdev
->mddev
->external
)
2972 /* Must set offset before size, so overlap checks
2975 rdev
->data_offset
= offset
;
2976 rdev
->new_data_offset
= offset
;
2980 static struct rdev_sysfs_entry rdev_offset
=
2981 __ATTR(offset
, S_IRUGO
|S_IWUSR
, offset_show
, offset_store
);
2983 static ssize_t
new_offset_show(struct md_rdev
*rdev
, char *page
)
2985 return sprintf(page
, "%llu\n",
2986 (unsigned long long)rdev
->new_data_offset
);
2989 static ssize_t
new_offset_store(struct md_rdev
*rdev
,
2990 const char *buf
, size_t len
)
2992 unsigned long long new_offset
;
2993 struct mddev
*mddev
= rdev
->mddev
;
2995 if (kstrtoull(buf
, 10, &new_offset
) < 0)
2998 if (mddev
->sync_thread
||
2999 test_bit(MD_RECOVERY_RUNNING
,&mddev
->recovery
))
3001 if (new_offset
== rdev
->data_offset
)
3002 /* reset is always permitted */
3004 else if (new_offset
> rdev
->data_offset
) {
3005 /* must not push array size beyond rdev_sectors */
3006 if (new_offset
- rdev
->data_offset
3007 + mddev
->dev_sectors
> rdev
->sectors
)
3010 /* Metadata worries about other space details. */
3012 /* decreasing the offset is inconsistent with a backwards
3015 if (new_offset
< rdev
->data_offset
&&
3016 mddev
->reshape_backwards
)
3018 /* Increasing offset is inconsistent with forwards
3019 * reshape. reshape_direction should be set to
3020 * 'backwards' first.
3022 if (new_offset
> rdev
->data_offset
&&
3023 !mddev
->reshape_backwards
)
3026 if (mddev
->pers
&& mddev
->persistent
&&
3027 !super_types
[mddev
->major_version
]
3028 .allow_new_offset(rdev
, new_offset
))
3030 rdev
->new_data_offset
= new_offset
;
3031 if (new_offset
> rdev
->data_offset
)
3032 mddev
->reshape_backwards
= 1;
3033 else if (new_offset
< rdev
->data_offset
)
3034 mddev
->reshape_backwards
= 0;
3038 static struct rdev_sysfs_entry rdev_new_offset
=
3039 __ATTR(new_offset
, S_IRUGO
|S_IWUSR
, new_offset_show
, new_offset_store
);
3042 rdev_size_show(struct md_rdev
*rdev
, char *page
)
3044 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->sectors
/ 2);
3047 static int overlaps(sector_t s1
, sector_t l1
, sector_t s2
, sector_t l2
)
3049 /* check if two start/length pairs overlap */
3057 static int strict_blocks_to_sectors(const char *buf
, sector_t
*sectors
)
3059 unsigned long long blocks
;
3062 if (kstrtoull(buf
, 10, &blocks
) < 0)
3065 if (blocks
& 1ULL << (8 * sizeof(blocks
) - 1))
3066 return -EINVAL
; /* sector conversion overflow */
3069 if (new != blocks
* 2)
3070 return -EINVAL
; /* unsigned long long to sector_t overflow */
3077 rdev_size_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3079 struct mddev
*my_mddev
= rdev
->mddev
;
3080 sector_t oldsectors
= rdev
->sectors
;
3083 if (test_bit(Journal
, &rdev
->flags
))
3085 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
3087 if (rdev
->data_offset
!= rdev
->new_data_offset
)
3088 return -EINVAL
; /* too confusing */
3089 if (my_mddev
->pers
&& rdev
->raid_disk
>= 0) {
3090 if (my_mddev
->persistent
) {
3091 sectors
= super_types
[my_mddev
->major_version
].
3092 rdev_size_change(rdev
, sectors
);
3095 } else if (!sectors
)
3096 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) -
3098 if (!my_mddev
->pers
->resize
)
3099 /* Cannot change size for RAID0 or Linear etc */
3102 if (sectors
< my_mddev
->dev_sectors
)
3103 return -EINVAL
; /* component must fit device */
3105 rdev
->sectors
= sectors
;
3106 if (sectors
> oldsectors
&& my_mddev
->external
) {
3107 /* Need to check that all other rdevs with the same
3108 * ->bdev do not overlap. 'rcu' is sufficient to walk
3109 * the rdev lists safely.
3110 * This check does not provide a hard guarantee, it
3111 * just helps avoid dangerous mistakes.
3113 struct mddev
*mddev
;
3115 struct list_head
*tmp
;
3118 for_each_mddev(mddev
, tmp
) {
3119 struct md_rdev
*rdev2
;
3121 rdev_for_each(rdev2
, mddev
)
3122 if (rdev
->bdev
== rdev2
->bdev
&&
3124 overlaps(rdev
->data_offset
, rdev
->sectors
,
3137 /* Someone else could have slipped in a size
3138 * change here, but doing so is just silly.
3139 * We put oldsectors back because we *know* it is
3140 * safe, and trust userspace not to race with
3143 rdev
->sectors
= oldsectors
;
3150 static struct rdev_sysfs_entry rdev_size
=
3151 __ATTR(size
, S_IRUGO
|S_IWUSR
, rdev_size_show
, rdev_size_store
);
3153 static ssize_t
recovery_start_show(struct md_rdev
*rdev
, char *page
)
3155 unsigned long long recovery_start
= rdev
->recovery_offset
;
3157 if (test_bit(In_sync
, &rdev
->flags
) ||
3158 recovery_start
== MaxSector
)
3159 return sprintf(page
, "none\n");
3161 return sprintf(page
, "%llu\n", recovery_start
);
3164 static ssize_t
recovery_start_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3166 unsigned long long recovery_start
;
3168 if (cmd_match(buf
, "none"))
3169 recovery_start
= MaxSector
;
3170 else if (kstrtoull(buf
, 10, &recovery_start
))
3173 if (rdev
->mddev
->pers
&&
3174 rdev
->raid_disk
>= 0)
3177 rdev
->recovery_offset
= recovery_start
;
3178 if (recovery_start
== MaxSector
)
3179 set_bit(In_sync
, &rdev
->flags
);
3181 clear_bit(In_sync
, &rdev
->flags
);
3185 static struct rdev_sysfs_entry rdev_recovery_start
=
3186 __ATTR(recovery_start
, S_IRUGO
|S_IWUSR
, recovery_start_show
, recovery_start_store
);
3188 /* sysfs access to bad-blocks list.
3189 * We present two files.
3190 * 'bad-blocks' lists sector numbers and lengths of ranges that
3191 * are recorded as bad. The list is truncated to fit within
3192 * the one-page limit of sysfs.
3193 * Writing "sector length" to this file adds an acknowledged
3195 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
3196 * been acknowledged. Writing to this file adds bad blocks
3197 * without acknowledging them. This is largely for testing.
3199 static ssize_t
bb_show(struct md_rdev
*rdev
, char *page
)
3201 return badblocks_show(&rdev
->badblocks
, page
, 0);
3203 static ssize_t
bb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
3205 int rv
= badblocks_store(&rdev
->badblocks
, page
, len
, 0);
3206 /* Maybe that ack was all we needed */
3207 if (test_and_clear_bit(BlockedBadBlocks
, &rdev
->flags
))
3208 wake_up(&rdev
->blocked_wait
);
3211 static struct rdev_sysfs_entry rdev_bad_blocks
=
3212 __ATTR(bad_blocks
, S_IRUGO
|S_IWUSR
, bb_show
, bb_store
);
3214 static ssize_t
ubb_show(struct md_rdev
*rdev
, char *page
)
3216 return badblocks_show(&rdev
->badblocks
, page
, 1);
3218 static ssize_t
ubb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
3220 return badblocks_store(&rdev
->badblocks
, page
, len
, 1);
3222 static struct rdev_sysfs_entry rdev_unack_bad_blocks
=
3223 __ATTR(unacknowledged_bad_blocks
, S_IRUGO
|S_IWUSR
, ubb_show
, ubb_store
);
3226 ppl_sector_show(struct md_rdev
*rdev
, char *page
)
3228 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->ppl
.sector
);
3232 ppl_sector_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3234 unsigned long long sector
;
3236 if (kstrtoull(buf
, 10, §or
) < 0)
3238 if (sector
!= (sector_t
)sector
)
3241 if (rdev
->mddev
->pers
&& test_bit(MD_HAS_PPL
, &rdev
->mddev
->flags
) &&
3242 rdev
->raid_disk
>= 0)
3245 if (rdev
->mddev
->persistent
) {
3246 if (rdev
->mddev
->major_version
== 0)
3248 if ((sector
> rdev
->sb_start
&&
3249 sector
- rdev
->sb_start
> S16_MAX
) ||
3250 (sector
< rdev
->sb_start
&&
3251 rdev
->sb_start
- sector
> -S16_MIN
))
3253 rdev
->ppl
.offset
= sector
- rdev
->sb_start
;
3254 } else if (!rdev
->mddev
->external
) {
3257 rdev
->ppl
.sector
= sector
;
3261 static struct rdev_sysfs_entry rdev_ppl_sector
=
3262 __ATTR(ppl_sector
, S_IRUGO
|S_IWUSR
, ppl_sector_show
, ppl_sector_store
);
3265 ppl_size_show(struct md_rdev
*rdev
, char *page
)
3267 return sprintf(page
, "%u\n", rdev
->ppl
.size
);
3271 ppl_size_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3275 if (kstrtouint(buf
, 10, &size
) < 0)
3278 if (rdev
->mddev
->pers
&& test_bit(MD_HAS_PPL
, &rdev
->mddev
->flags
) &&
3279 rdev
->raid_disk
>= 0)
3282 if (rdev
->mddev
->persistent
) {
3283 if (rdev
->mddev
->major_version
== 0)
3287 } else if (!rdev
->mddev
->external
) {
3290 rdev
->ppl
.size
= size
;
3294 static struct rdev_sysfs_entry rdev_ppl_size
=
3295 __ATTR(ppl_size
, S_IRUGO
|S_IWUSR
, ppl_size_show
, ppl_size_store
);
3297 static struct attribute
*rdev_default_attrs
[] = {
3302 &rdev_new_offset
.attr
,
3304 &rdev_recovery_start
.attr
,
3305 &rdev_bad_blocks
.attr
,
3306 &rdev_unack_bad_blocks
.attr
,
3307 &rdev_ppl_sector
.attr
,
3308 &rdev_ppl_size
.attr
,
3312 rdev_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
3314 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
3315 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
3321 return entry
->show(rdev
, page
);
3325 rdev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
3326 const char *page
, size_t length
)
3328 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
3329 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
3331 struct mddev
*mddev
= rdev
->mddev
;
3335 if (!capable(CAP_SYS_ADMIN
))
3337 rv
= mddev
? mddev_lock(mddev
): -EBUSY
;
3339 if (rdev
->mddev
== NULL
)
3342 rv
= entry
->store(rdev
, page
, length
);
3343 mddev_unlock(mddev
);
3348 static void rdev_free(struct kobject
*ko
)
3350 struct md_rdev
*rdev
= container_of(ko
, struct md_rdev
, kobj
);
3353 static const struct sysfs_ops rdev_sysfs_ops
= {
3354 .show
= rdev_attr_show
,
3355 .store
= rdev_attr_store
,
3357 static struct kobj_type rdev_ktype
= {
3358 .release
= rdev_free
,
3359 .sysfs_ops
= &rdev_sysfs_ops
,
3360 .default_attrs
= rdev_default_attrs
,
3363 int md_rdev_init(struct md_rdev
*rdev
)
3366 rdev
->saved_raid_disk
= -1;
3367 rdev
->raid_disk
= -1;
3369 rdev
->data_offset
= 0;
3370 rdev
->new_data_offset
= 0;
3371 rdev
->sb_events
= 0;
3372 rdev
->last_read_error
= 0;
3373 rdev
->sb_loaded
= 0;
3374 rdev
->bb_page
= NULL
;
3375 atomic_set(&rdev
->nr_pending
, 0);
3376 atomic_set(&rdev
->read_errors
, 0);
3377 atomic_set(&rdev
->corrected_errors
, 0);
3379 INIT_LIST_HEAD(&rdev
->same_set
);
3380 init_waitqueue_head(&rdev
->blocked_wait
);
3382 /* Add space to store bad block list.
3383 * This reserves the space even on arrays where it cannot
3384 * be used - I wonder if that matters
3386 return badblocks_init(&rdev
->badblocks
, 0);
3388 EXPORT_SYMBOL_GPL(md_rdev_init
);
3390 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3392 * mark the device faulty if:
3394 * - the device is nonexistent (zero size)
3395 * - the device has no valid superblock
3397 * a faulty rdev _never_ has rdev->sb set.
3399 static struct md_rdev
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
3401 char b
[BDEVNAME_SIZE
];
3403 struct md_rdev
*rdev
;
3406 rdev
= kzalloc(sizeof(*rdev
), GFP_KERNEL
);
3408 return ERR_PTR(-ENOMEM
);
3410 err
= md_rdev_init(rdev
);
3413 err
= alloc_disk_sb(rdev
);
3417 err
= lock_rdev(rdev
, newdev
, super_format
== -2);
3421 kobject_init(&rdev
->kobj
, &rdev_ktype
);
3423 size
= i_size_read(rdev
->bdev
->bd_inode
) >> BLOCK_SIZE_BITS
;
3425 pr_warn("md: %s has zero or unknown size, marking faulty!\n",
3426 bdevname(rdev
->bdev
,b
));
3431 if (super_format
>= 0) {
3432 err
= super_types
[super_format
].
3433 load_super(rdev
, NULL
, super_minor
);
3434 if (err
== -EINVAL
) {
3435 pr_warn("md: %s does not have a valid v%d.%d superblock, not importing!\n",
3436 bdevname(rdev
->bdev
,b
),
3437 super_format
, super_minor
);
3441 pr_warn("md: could not read %s's sb, not importing!\n",
3442 bdevname(rdev
->bdev
,b
));
3452 md_rdev_clear(rdev
);
3454 return ERR_PTR(err
);
3458 * Check a full RAID array for plausibility
3461 static void analyze_sbs(struct mddev
*mddev
)
3464 struct md_rdev
*rdev
, *freshest
, *tmp
;
3465 char b
[BDEVNAME_SIZE
];
3468 rdev_for_each_safe(rdev
, tmp
, mddev
)
3469 switch (super_types
[mddev
->major_version
].
3470 load_super(rdev
, freshest
, mddev
->minor_version
)) {
3477 pr_warn("md: fatal superblock inconsistency in %s -- removing from array\n",
3478 bdevname(rdev
->bdev
,b
));
3479 md_kick_rdev_from_array(rdev
);
3482 super_types
[mddev
->major_version
].
3483 validate_super(mddev
, freshest
);
3486 rdev_for_each_safe(rdev
, tmp
, mddev
) {
3487 if (mddev
->max_disks
&&
3488 (rdev
->desc_nr
>= mddev
->max_disks
||
3489 i
> mddev
->max_disks
)) {
3490 pr_warn("md: %s: %s: only %d devices permitted\n",
3491 mdname(mddev
), bdevname(rdev
->bdev
, b
),
3493 md_kick_rdev_from_array(rdev
);
3496 if (rdev
!= freshest
) {
3497 if (super_types
[mddev
->major_version
].
3498 validate_super(mddev
, rdev
)) {
3499 pr_warn("md: kicking non-fresh %s from array!\n",
3500 bdevname(rdev
->bdev
,b
));
3501 md_kick_rdev_from_array(rdev
);
3505 if (mddev
->level
== LEVEL_MULTIPATH
) {
3506 rdev
->desc_nr
= i
++;
3507 rdev
->raid_disk
= rdev
->desc_nr
;
3508 set_bit(In_sync
, &rdev
->flags
);
3509 } else if (rdev
->raid_disk
>=
3510 (mddev
->raid_disks
- min(0, mddev
->delta_disks
)) &&
3511 !test_bit(Journal
, &rdev
->flags
)) {
3512 rdev
->raid_disk
= -1;
3513 clear_bit(In_sync
, &rdev
->flags
);
3518 /* Read a fixed-point number.
3519 * Numbers in sysfs attributes should be in "standard" units where
3520 * possible, so time should be in seconds.
3521 * However we internally use a a much smaller unit such as
3522 * milliseconds or jiffies.
3523 * This function takes a decimal number with a possible fractional
3524 * component, and produces an integer which is the result of
3525 * multiplying that number by 10^'scale'.
3526 * all without any floating-point arithmetic.
3528 int strict_strtoul_scaled(const char *cp
, unsigned long *res
, int scale
)
3530 unsigned long result
= 0;
3532 while (isdigit(*cp
) || (*cp
== '.' && decimals
< 0)) {
3535 else if (decimals
< scale
) {
3538 result
= result
* 10 + value
;
3550 while (decimals
< scale
) {
3559 safe_delay_show(struct mddev
*mddev
, char *page
)
3561 int msec
= (mddev
->safemode_delay
*1000)/HZ
;
3562 return sprintf(page
, "%d.%03d\n", msec
/1000, msec
%1000);
3565 safe_delay_store(struct mddev
*mddev
, const char *cbuf
, size_t len
)
3569 if (mddev_is_clustered(mddev
)) {
3570 pr_warn("md: Safemode is disabled for clustered mode\n");
3574 if (strict_strtoul_scaled(cbuf
, &msec
, 3) < 0)
3577 mddev
->safemode_delay
= 0;
3579 unsigned long old_delay
= mddev
->safemode_delay
;
3580 unsigned long new_delay
= (msec
*HZ
)/1000;
3584 mddev
->safemode_delay
= new_delay
;
3585 if (new_delay
< old_delay
|| old_delay
== 0)
3586 mod_timer(&mddev
->safemode_timer
, jiffies
+1);
3590 static struct md_sysfs_entry md_safe_delay
=
3591 __ATTR(safe_mode_delay
, S_IRUGO
|S_IWUSR
,safe_delay_show
, safe_delay_store
);
3594 level_show(struct mddev
*mddev
, char *page
)
3596 struct md_personality
*p
;
3598 spin_lock(&mddev
->lock
);
3601 ret
= sprintf(page
, "%s\n", p
->name
);
3602 else if (mddev
->clevel
[0])
3603 ret
= sprintf(page
, "%s\n", mddev
->clevel
);
3604 else if (mddev
->level
!= LEVEL_NONE
)
3605 ret
= sprintf(page
, "%d\n", mddev
->level
);
3608 spin_unlock(&mddev
->lock
);
3613 level_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3618 struct md_personality
*pers
, *oldpers
;
3620 void *priv
, *oldpriv
;
3621 struct md_rdev
*rdev
;
3623 if (slen
== 0 || slen
>= sizeof(clevel
))
3626 rv
= mddev_lock(mddev
);
3630 if (mddev
->pers
== NULL
) {
3631 strncpy(mddev
->clevel
, buf
, slen
);
3632 if (mddev
->clevel
[slen
-1] == '\n')
3634 mddev
->clevel
[slen
] = 0;
3635 mddev
->level
= LEVEL_NONE
;
3643 /* request to change the personality. Need to ensure:
3644 * - array is not engaged in resync/recovery/reshape
3645 * - old personality can be suspended
3646 * - new personality will access other array.
3650 if (mddev
->sync_thread
||
3651 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
3652 mddev
->reshape_position
!= MaxSector
||
3653 mddev
->sysfs_active
)
3657 if (!mddev
->pers
->quiesce
) {
3658 pr_warn("md: %s: %s does not support online personality change\n",
3659 mdname(mddev
), mddev
->pers
->name
);
3663 /* Now find the new personality */
3664 strncpy(clevel
, buf
, slen
);
3665 if (clevel
[slen
-1] == '\n')
3668 if (kstrtol(clevel
, 10, &level
))
3671 if (request_module("md-%s", clevel
) != 0)
3672 request_module("md-level-%s", clevel
);
3673 spin_lock(&pers_lock
);
3674 pers
= find_pers(level
, clevel
);
3675 if (!pers
|| !try_module_get(pers
->owner
)) {
3676 spin_unlock(&pers_lock
);
3677 pr_warn("md: personality %s not loaded\n", clevel
);
3681 spin_unlock(&pers_lock
);
3683 if (pers
== mddev
->pers
) {
3684 /* Nothing to do! */
3685 module_put(pers
->owner
);
3689 if (!pers
->takeover
) {
3690 module_put(pers
->owner
);
3691 pr_warn("md: %s: %s does not support personality takeover\n",
3692 mdname(mddev
), clevel
);
3697 rdev_for_each(rdev
, mddev
)
3698 rdev
->new_raid_disk
= rdev
->raid_disk
;
3700 /* ->takeover must set new_* and/or delta_disks
3701 * if it succeeds, and may set them when it fails.
3703 priv
= pers
->takeover(mddev
);
3705 mddev
->new_level
= mddev
->level
;
3706 mddev
->new_layout
= mddev
->layout
;
3707 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3708 mddev
->raid_disks
-= mddev
->delta_disks
;
3709 mddev
->delta_disks
= 0;
3710 mddev
->reshape_backwards
= 0;
3711 module_put(pers
->owner
);
3712 pr_warn("md: %s: %s would not accept array\n",
3713 mdname(mddev
), clevel
);
3718 /* Looks like we have a winner */
3719 mddev_suspend(mddev
);
3720 mddev_detach(mddev
);
3722 spin_lock(&mddev
->lock
);
3723 oldpers
= mddev
->pers
;
3724 oldpriv
= mddev
->private;
3726 mddev
->private = priv
;
3727 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
3728 mddev
->level
= mddev
->new_level
;
3729 mddev
->layout
= mddev
->new_layout
;
3730 mddev
->chunk_sectors
= mddev
->new_chunk_sectors
;
3731 mddev
->delta_disks
= 0;
3732 mddev
->reshape_backwards
= 0;
3733 mddev
->degraded
= 0;
3734 spin_unlock(&mddev
->lock
);
3736 if (oldpers
->sync_request
== NULL
&&
3738 /* We are converting from a no-redundancy array
3739 * to a redundancy array and metadata is managed
3740 * externally so we need to be sure that writes
3741 * won't block due to a need to transition
3743 * until external management is started.
3746 mddev
->safemode_delay
= 0;
3747 mddev
->safemode
= 0;
3750 oldpers
->free(mddev
, oldpriv
);
3752 if (oldpers
->sync_request
== NULL
&&
3753 pers
->sync_request
!= NULL
) {
3754 /* need to add the md_redundancy_group */
3755 if (sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
3756 pr_warn("md: cannot register extra attributes for %s\n",
3758 mddev
->sysfs_action
= sysfs_get_dirent(mddev
->kobj
.sd
, "sync_action");
3760 if (oldpers
->sync_request
!= NULL
&&
3761 pers
->sync_request
== NULL
) {
3762 /* need to remove the md_redundancy_group */
3763 if (mddev
->to_remove
== NULL
)
3764 mddev
->to_remove
= &md_redundancy_group
;
3767 module_put(oldpers
->owner
);
3769 rdev_for_each(rdev
, mddev
) {
3770 if (rdev
->raid_disk
< 0)
3772 if (rdev
->new_raid_disk
>= mddev
->raid_disks
)
3773 rdev
->new_raid_disk
= -1;
3774 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3776 sysfs_unlink_rdev(mddev
, rdev
);
3778 rdev_for_each(rdev
, mddev
) {
3779 if (rdev
->raid_disk
< 0)
3781 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3783 rdev
->raid_disk
= rdev
->new_raid_disk
;
3784 if (rdev
->raid_disk
< 0)
3785 clear_bit(In_sync
, &rdev
->flags
);
3787 if (sysfs_link_rdev(mddev
, rdev
))
3788 pr_warn("md: cannot register rd%d for %s after level change\n",
3789 rdev
->raid_disk
, mdname(mddev
));
3793 if (pers
->sync_request
== NULL
) {
3794 /* this is now an array without redundancy, so
3795 * it must always be in_sync
3798 del_timer_sync(&mddev
->safemode_timer
);
3800 blk_set_stacking_limits(&mddev
->queue
->limits
);
3802 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
3803 mddev_resume(mddev
);
3805 md_update_sb(mddev
, 1);
3806 sysfs_notify(&mddev
->kobj
, NULL
, "level");
3807 md_new_event(mddev
);
3810 mddev_unlock(mddev
);
3814 static struct md_sysfs_entry md_level
=
3815 __ATTR(level
, S_IRUGO
|S_IWUSR
, level_show
, level_store
);
3818 layout_show(struct mddev
*mddev
, char *page
)
3820 /* just a number, not meaningful for all levels */
3821 if (mddev
->reshape_position
!= MaxSector
&&
3822 mddev
->layout
!= mddev
->new_layout
)
3823 return sprintf(page
, "%d (%d)\n",
3824 mddev
->new_layout
, mddev
->layout
);
3825 return sprintf(page
, "%d\n", mddev
->layout
);
3829 layout_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3834 err
= kstrtouint(buf
, 10, &n
);
3837 err
= mddev_lock(mddev
);
3842 if (mddev
->pers
->check_reshape
== NULL
)
3847 mddev
->new_layout
= n
;
3848 err
= mddev
->pers
->check_reshape(mddev
);
3850 mddev
->new_layout
= mddev
->layout
;
3853 mddev
->new_layout
= n
;
3854 if (mddev
->reshape_position
== MaxSector
)
3857 mddev_unlock(mddev
);
3860 static struct md_sysfs_entry md_layout
=
3861 __ATTR(layout
, S_IRUGO
|S_IWUSR
, layout_show
, layout_store
);
3864 raid_disks_show(struct mddev
*mddev
, char *page
)
3866 if (mddev
->raid_disks
== 0)
3868 if (mddev
->reshape_position
!= MaxSector
&&
3869 mddev
->delta_disks
!= 0)
3870 return sprintf(page
, "%d (%d)\n", mddev
->raid_disks
,
3871 mddev
->raid_disks
- mddev
->delta_disks
);
3872 return sprintf(page
, "%d\n", mddev
->raid_disks
);
3875 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
);
3878 raid_disks_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3883 err
= kstrtouint(buf
, 10, &n
);
3887 err
= mddev_lock(mddev
);
3891 err
= update_raid_disks(mddev
, n
);
3892 else if (mddev
->reshape_position
!= MaxSector
) {
3893 struct md_rdev
*rdev
;
3894 int olddisks
= mddev
->raid_disks
- mddev
->delta_disks
;
3897 rdev_for_each(rdev
, mddev
) {
3899 rdev
->data_offset
< rdev
->new_data_offset
)
3902 rdev
->data_offset
> rdev
->new_data_offset
)
3906 mddev
->delta_disks
= n
- olddisks
;
3907 mddev
->raid_disks
= n
;
3908 mddev
->reshape_backwards
= (mddev
->delta_disks
< 0);
3910 mddev
->raid_disks
= n
;
3912 mddev_unlock(mddev
);
3913 return err
? err
: len
;
3915 static struct md_sysfs_entry md_raid_disks
=
3916 __ATTR(raid_disks
, S_IRUGO
|S_IWUSR
, raid_disks_show
, raid_disks_store
);
3919 chunk_size_show(struct mddev
*mddev
, char *page
)
3921 if (mddev
->reshape_position
!= MaxSector
&&
3922 mddev
->chunk_sectors
!= mddev
->new_chunk_sectors
)
3923 return sprintf(page
, "%d (%d)\n",
3924 mddev
->new_chunk_sectors
<< 9,
3925 mddev
->chunk_sectors
<< 9);
3926 return sprintf(page
, "%d\n", mddev
->chunk_sectors
<< 9);
3930 chunk_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3935 err
= kstrtoul(buf
, 10, &n
);
3939 err
= mddev_lock(mddev
);
3943 if (mddev
->pers
->check_reshape
== NULL
)
3948 mddev
->new_chunk_sectors
= n
>> 9;
3949 err
= mddev
->pers
->check_reshape(mddev
);
3951 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3954 mddev
->new_chunk_sectors
= n
>> 9;
3955 if (mddev
->reshape_position
== MaxSector
)
3956 mddev
->chunk_sectors
= n
>> 9;
3958 mddev_unlock(mddev
);
3961 static struct md_sysfs_entry md_chunk_size
=
3962 __ATTR(chunk_size
, S_IRUGO
|S_IWUSR
, chunk_size_show
, chunk_size_store
);
3965 resync_start_show(struct mddev
*mddev
, char *page
)
3967 if (mddev
->recovery_cp
== MaxSector
)
3968 return sprintf(page
, "none\n");
3969 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->recovery_cp
);
3973 resync_start_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3975 unsigned long long n
;
3978 if (cmd_match(buf
, "none"))
3981 err
= kstrtoull(buf
, 10, &n
);
3984 if (n
!= (sector_t
)n
)
3988 err
= mddev_lock(mddev
);
3991 if (mddev
->pers
&& !test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
3995 mddev
->recovery_cp
= n
;
3997 set_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
3999 mddev_unlock(mddev
);
4002 static struct md_sysfs_entry md_resync_start
=
4003 __ATTR_PREALLOC(resync_start
, S_IRUGO
|S_IWUSR
,
4004 resync_start_show
, resync_start_store
);
4007 * The array state can be:
4010 * No devices, no size, no level
4011 * Equivalent to STOP_ARRAY ioctl
4013 * May have some settings, but array is not active
4014 * all IO results in error
4015 * When written, doesn't tear down array, but just stops it
4016 * suspended (not supported yet)
4017 * All IO requests will block. The array can be reconfigured.
4018 * Writing this, if accepted, will block until array is quiescent
4020 * no resync can happen. no superblocks get written.
4021 * write requests fail
4023 * like readonly, but behaves like 'clean' on a write request.
4025 * clean - no pending writes, but otherwise active.
4026 * When written to inactive array, starts without resync
4027 * If a write request arrives then
4028 * if metadata is known, mark 'dirty' and switch to 'active'.
4029 * if not known, block and switch to write-pending
4030 * If written to an active array that has pending writes, then fails.
4032 * fully active: IO and resync can be happening.
4033 * When written to inactive array, starts with resync
4036 * clean, but writes are blocked waiting for 'active' to be written.
4039 * like active, but no writes have been seen for a while (100msec).
4042 enum array_state
{ clear
, inactive
, suspended
, readonly
, read_auto
, clean
, active
,
4043 write_pending
, active_idle
, bad_word
};
4044 static char *array_states
[] = {
4045 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
4046 "write-pending", "active-idle", NULL
};
4048 static int match_word(const char *word
, char **list
)
4051 for (n
=0; list
[n
]; n
++)
4052 if (cmd_match(word
, list
[n
]))
4058 array_state_show(struct mddev
*mddev
, char *page
)
4060 enum array_state st
= inactive
;
4071 spin_lock(&mddev
->lock
);
4072 if (test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
))
4074 else if (mddev
->in_sync
)
4076 else if (mddev
->safemode
)
4080 spin_unlock(&mddev
->lock
);
4083 if (list_empty(&mddev
->disks
) &&
4084 mddev
->raid_disks
== 0 &&
4085 mddev
->dev_sectors
== 0)
4090 return sprintf(page
, "%s\n", array_states
[st
]);
4093 static int do_md_stop(struct mddev
*mddev
, int ro
, struct block_device
*bdev
);
4094 static int md_set_readonly(struct mddev
*mddev
, struct block_device
*bdev
);
4095 static int do_md_run(struct mddev
*mddev
);
4096 static int restart_array(struct mddev
*mddev
);
4099 array_state_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4102 enum array_state st
= match_word(buf
, array_states
);
4104 if (mddev
->pers
&& (st
== active
|| st
== clean
) && mddev
->ro
!= 1) {
4105 /* don't take reconfig_mutex when toggling between
4108 spin_lock(&mddev
->lock
);
4110 restart_array(mddev
);
4111 clear_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
4112 md_wakeup_thread(mddev
->thread
);
4113 wake_up(&mddev
->sb_wait
);
4114 } else /* st == clean */ {
4115 restart_array(mddev
);
4116 if (!set_in_sync(mddev
))
4120 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4121 spin_unlock(&mddev
->lock
);
4124 err
= mddev_lock(mddev
);
4132 /* stopping an active array */
4133 err
= do_md_stop(mddev
, 0, NULL
);
4136 /* stopping an active array */
4138 err
= do_md_stop(mddev
, 2, NULL
);
4140 err
= 0; /* already inactive */
4143 break; /* not supported yet */
4146 err
= md_set_readonly(mddev
, NULL
);
4149 set_disk_ro(mddev
->gendisk
, 1);
4150 err
= do_md_run(mddev
);
4156 err
= md_set_readonly(mddev
, NULL
);
4157 else if (mddev
->ro
== 1)
4158 err
= restart_array(mddev
);
4161 set_disk_ro(mddev
->gendisk
, 0);
4165 err
= do_md_run(mddev
);
4170 err
= restart_array(mddev
);
4173 spin_lock(&mddev
->lock
);
4174 if (!set_in_sync(mddev
))
4176 spin_unlock(&mddev
->lock
);
4182 err
= restart_array(mddev
);
4185 clear_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
4186 wake_up(&mddev
->sb_wait
);
4190 set_disk_ro(mddev
->gendisk
, 0);
4191 err
= do_md_run(mddev
);
4196 /* these cannot be set */
4201 if (mddev
->hold_active
== UNTIL_IOCTL
)
4202 mddev
->hold_active
= 0;
4203 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4205 mddev_unlock(mddev
);
4208 static struct md_sysfs_entry md_array_state
=
4209 __ATTR_PREALLOC(array_state
, S_IRUGO
|S_IWUSR
, array_state_show
, array_state_store
);
4212 max_corrected_read_errors_show(struct mddev
*mddev
, char *page
) {
4213 return sprintf(page
, "%d\n",
4214 atomic_read(&mddev
->max_corr_read_errors
));
4218 max_corrected_read_errors_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4223 rv
= kstrtouint(buf
, 10, &n
);
4226 atomic_set(&mddev
->max_corr_read_errors
, n
);
4230 static struct md_sysfs_entry max_corr_read_errors
=
4231 __ATTR(max_read_errors
, S_IRUGO
|S_IWUSR
, max_corrected_read_errors_show
,
4232 max_corrected_read_errors_store
);
4235 null_show(struct mddev
*mddev
, char *page
)
4241 new_dev_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4243 /* buf must be %d:%d\n? giving major and minor numbers */
4244 /* The new device is added to the array.
4245 * If the array has a persistent superblock, we read the
4246 * superblock to initialise info and check validity.
4247 * Otherwise, only checking done is that in bind_rdev_to_array,
4248 * which mainly checks size.
4251 int major
= simple_strtoul(buf
, &e
, 10);
4254 struct md_rdev
*rdev
;
4257 if (!*buf
|| *e
!= ':' || !e
[1] || e
[1] == '\n')
4259 minor
= simple_strtoul(e
+1, &e
, 10);
4260 if (*e
&& *e
!= '\n')
4262 dev
= MKDEV(major
, minor
);
4263 if (major
!= MAJOR(dev
) ||
4264 minor
!= MINOR(dev
))
4267 flush_workqueue(md_misc_wq
);
4269 err
= mddev_lock(mddev
);
4272 if (mddev
->persistent
) {
4273 rdev
= md_import_device(dev
, mddev
->major_version
,
4274 mddev
->minor_version
);
4275 if (!IS_ERR(rdev
) && !list_empty(&mddev
->disks
)) {
4276 struct md_rdev
*rdev0
4277 = list_entry(mddev
->disks
.next
,
4278 struct md_rdev
, same_set
);
4279 err
= super_types
[mddev
->major_version
]
4280 .load_super(rdev
, rdev0
, mddev
->minor_version
);
4284 } else if (mddev
->external
)
4285 rdev
= md_import_device(dev
, -2, -1);
4287 rdev
= md_import_device(dev
, -1, -1);
4290 mddev_unlock(mddev
);
4291 return PTR_ERR(rdev
);
4293 err
= bind_rdev_to_array(rdev
, mddev
);
4297 mddev_unlock(mddev
);
4299 md_new_event(mddev
);
4300 return err
? err
: len
;
4303 static struct md_sysfs_entry md_new_device
=
4304 __ATTR(new_dev
, S_IWUSR
, null_show
, new_dev_store
);
4307 bitmap_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4310 unsigned long chunk
, end_chunk
;
4313 err
= mddev_lock(mddev
);
4318 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
4320 chunk
= end_chunk
= simple_strtoul(buf
, &end
, 0);
4321 if (buf
== end
) break;
4322 if (*end
== '-') { /* range */
4324 end_chunk
= simple_strtoul(buf
, &end
, 0);
4325 if (buf
== end
) break;
4327 if (*end
&& !isspace(*end
)) break;
4328 bitmap_dirty_bits(mddev
->bitmap
, chunk
, end_chunk
);
4329 buf
= skip_spaces(end
);
4331 bitmap_unplug(mddev
->bitmap
); /* flush the bits to disk */
4333 mddev_unlock(mddev
);
4337 static struct md_sysfs_entry md_bitmap
=
4338 __ATTR(bitmap_set_bits
, S_IWUSR
, null_show
, bitmap_store
);
4341 size_show(struct mddev
*mddev
, char *page
)
4343 return sprintf(page
, "%llu\n",
4344 (unsigned long long)mddev
->dev_sectors
/ 2);
4347 static int update_size(struct mddev
*mddev
, sector_t num_sectors
);
4350 size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4352 /* If array is inactive, we can reduce the component size, but
4353 * not increase it (except from 0).
4354 * If array is active, we can try an on-line resize
4357 int err
= strict_blocks_to_sectors(buf
, §ors
);
4361 err
= mddev_lock(mddev
);
4365 err
= update_size(mddev
, sectors
);
4367 md_update_sb(mddev
, 1);
4369 if (mddev
->dev_sectors
== 0 ||
4370 mddev
->dev_sectors
> sectors
)
4371 mddev
->dev_sectors
= sectors
;
4375 mddev_unlock(mddev
);
4376 return err
? err
: len
;
4379 static struct md_sysfs_entry md_size
=
4380 __ATTR(component_size
, S_IRUGO
|S_IWUSR
, size_show
, size_store
);
4382 /* Metadata version.
4384 * 'none' for arrays with no metadata (good luck...)
4385 * 'external' for arrays with externally managed metadata,
4386 * or N.M for internally known formats
4389 metadata_show(struct mddev
*mddev
, char *page
)
4391 if (mddev
->persistent
)
4392 return sprintf(page
, "%d.%d\n",
4393 mddev
->major_version
, mddev
->minor_version
);
4394 else if (mddev
->external
)
4395 return sprintf(page
, "external:%s\n", mddev
->metadata_type
);
4397 return sprintf(page
, "none\n");
4401 metadata_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4406 /* Changing the details of 'external' metadata is
4407 * always permitted. Otherwise there must be
4408 * no devices attached to the array.
4411 err
= mddev_lock(mddev
);
4415 if (mddev
->external
&& strncmp(buf
, "external:", 9) == 0)
4417 else if (!list_empty(&mddev
->disks
))
4421 if (cmd_match(buf
, "none")) {
4422 mddev
->persistent
= 0;
4423 mddev
->external
= 0;
4424 mddev
->major_version
= 0;
4425 mddev
->minor_version
= 90;
4428 if (strncmp(buf
, "external:", 9) == 0) {
4429 size_t namelen
= len
-9;
4430 if (namelen
>= sizeof(mddev
->metadata_type
))
4431 namelen
= sizeof(mddev
->metadata_type
)-1;
4432 strncpy(mddev
->metadata_type
, buf
+9, namelen
);
4433 mddev
->metadata_type
[namelen
] = 0;
4434 if (namelen
&& mddev
->metadata_type
[namelen
-1] == '\n')
4435 mddev
->metadata_type
[--namelen
] = 0;
4436 mddev
->persistent
= 0;
4437 mddev
->external
= 1;
4438 mddev
->major_version
= 0;
4439 mddev
->minor_version
= 90;
4442 major
= simple_strtoul(buf
, &e
, 10);
4444 if (e
==buf
|| *e
!= '.')
4447 minor
= simple_strtoul(buf
, &e
, 10);
4448 if (e
==buf
|| (*e
&& *e
!= '\n') )
4451 if (major
>= ARRAY_SIZE(super_types
) || super_types
[major
].name
== NULL
)
4453 mddev
->major_version
= major
;
4454 mddev
->minor_version
= minor
;
4455 mddev
->persistent
= 1;
4456 mddev
->external
= 0;
4459 mddev_unlock(mddev
);
4463 static struct md_sysfs_entry md_metadata
=
4464 __ATTR_PREALLOC(metadata_version
, S_IRUGO
|S_IWUSR
, metadata_show
, metadata_store
);
4467 action_show(struct mddev
*mddev
, char *page
)
4469 char *type
= "idle";
4470 unsigned long recovery
= mddev
->recovery
;
4471 if (test_bit(MD_RECOVERY_FROZEN
, &recovery
))
4473 else if (test_bit(MD_RECOVERY_RUNNING
, &recovery
) ||
4474 (!mddev
->ro
&& test_bit(MD_RECOVERY_NEEDED
, &recovery
))) {
4475 if (test_bit(MD_RECOVERY_RESHAPE
, &recovery
))
4477 else if (test_bit(MD_RECOVERY_SYNC
, &recovery
)) {
4478 if (!test_bit(MD_RECOVERY_REQUESTED
, &recovery
))
4480 else if (test_bit(MD_RECOVERY_CHECK
, &recovery
))
4484 } else if (test_bit(MD_RECOVERY_RECOVER
, &recovery
))
4486 else if (mddev
->reshape_position
!= MaxSector
)
4489 return sprintf(page
, "%s\n", type
);
4493 action_store(struct mddev
*mddev
, const char *page
, size_t len
)
4495 if (!mddev
->pers
|| !mddev
->pers
->sync_request
)
4499 if (cmd_match(page
, "idle") || cmd_match(page
, "frozen")) {
4500 if (cmd_match(page
, "frozen"))
4501 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4503 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4504 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
4505 mddev_lock(mddev
) == 0) {
4506 flush_workqueue(md_misc_wq
);
4507 if (mddev
->sync_thread
) {
4508 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4509 md_reap_sync_thread(mddev
);
4511 mddev_unlock(mddev
);
4513 } else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4515 else if (cmd_match(page
, "resync"))
4516 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4517 else if (cmd_match(page
, "recover")) {
4518 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4519 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
4520 } else if (cmd_match(page
, "reshape")) {
4522 if (mddev
->pers
->start_reshape
== NULL
)
4524 err
= mddev_lock(mddev
);
4526 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4529 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4530 err
= mddev
->pers
->start_reshape(mddev
);
4532 mddev_unlock(mddev
);
4536 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
4538 if (cmd_match(page
, "check"))
4539 set_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
4540 else if (!cmd_match(page
, "repair"))
4542 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4543 set_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
4544 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
4546 if (mddev
->ro
== 2) {
4547 /* A write to sync_action is enough to justify
4548 * canceling read-auto mode
4551 md_wakeup_thread(mddev
->sync_thread
);
4553 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4554 md_wakeup_thread(mddev
->thread
);
4555 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
4559 static struct md_sysfs_entry md_scan_mode
=
4560 __ATTR_PREALLOC(sync_action
, S_IRUGO
|S_IWUSR
, action_show
, action_store
);
4563 last_sync_action_show(struct mddev
*mddev
, char *page
)
4565 return sprintf(page
, "%s\n", mddev
->last_sync_action
);
4568 static struct md_sysfs_entry md_last_scan_mode
= __ATTR_RO(last_sync_action
);
4571 mismatch_cnt_show(struct mddev
*mddev
, char *page
)
4573 return sprintf(page
, "%llu\n",
4574 (unsigned long long)
4575 atomic64_read(&mddev
->resync_mismatches
));
4578 static struct md_sysfs_entry md_mismatches
= __ATTR_RO(mismatch_cnt
);
4581 sync_min_show(struct mddev
*mddev
, char *page
)
4583 return sprintf(page
, "%d (%s)\n", speed_min(mddev
),
4584 mddev
->sync_speed_min
? "local": "system");
4588 sync_min_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4593 if (strncmp(buf
, "system", 6)==0) {
4596 rv
= kstrtouint(buf
, 10, &min
);
4602 mddev
->sync_speed_min
= min
;
4606 static struct md_sysfs_entry md_sync_min
=
4607 __ATTR(sync_speed_min
, S_IRUGO
|S_IWUSR
, sync_min_show
, sync_min_store
);
4610 sync_max_show(struct mddev
*mddev
, char *page
)
4612 return sprintf(page
, "%d (%s)\n", speed_max(mddev
),
4613 mddev
->sync_speed_max
? "local": "system");
4617 sync_max_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4622 if (strncmp(buf
, "system", 6)==0) {
4625 rv
= kstrtouint(buf
, 10, &max
);
4631 mddev
->sync_speed_max
= max
;
4635 static struct md_sysfs_entry md_sync_max
=
4636 __ATTR(sync_speed_max
, S_IRUGO
|S_IWUSR
, sync_max_show
, sync_max_store
);
4639 degraded_show(struct mddev
*mddev
, char *page
)
4641 return sprintf(page
, "%d\n", mddev
->degraded
);
4643 static struct md_sysfs_entry md_degraded
= __ATTR_RO(degraded
);
4646 sync_force_parallel_show(struct mddev
*mddev
, char *page
)
4648 return sprintf(page
, "%d\n", mddev
->parallel_resync
);
4652 sync_force_parallel_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4656 if (kstrtol(buf
, 10, &n
))
4659 if (n
!= 0 && n
!= 1)
4662 mddev
->parallel_resync
= n
;
4664 if (mddev
->sync_thread
)
4665 wake_up(&resync_wait
);
4670 /* force parallel resync, even with shared block devices */
4671 static struct md_sysfs_entry md_sync_force_parallel
=
4672 __ATTR(sync_force_parallel
, S_IRUGO
|S_IWUSR
,
4673 sync_force_parallel_show
, sync_force_parallel_store
);
4676 sync_speed_show(struct mddev
*mddev
, char *page
)
4678 unsigned long resync
, dt
, db
;
4679 if (mddev
->curr_resync
== 0)
4680 return sprintf(page
, "none\n");
4681 resync
= mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
);
4682 dt
= (jiffies
- mddev
->resync_mark
) / HZ
;
4684 db
= resync
- mddev
->resync_mark_cnt
;
4685 return sprintf(page
, "%lu\n", db
/dt
/2); /* K/sec */
4688 static struct md_sysfs_entry md_sync_speed
= __ATTR_RO(sync_speed
);
4691 sync_completed_show(struct mddev
*mddev
, char *page
)
4693 unsigned long long max_sectors
, resync
;
4695 if (!test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4696 return sprintf(page
, "none\n");
4698 if (mddev
->curr_resync
== 1 ||
4699 mddev
->curr_resync
== 2)
4700 return sprintf(page
, "delayed\n");
4702 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
4703 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
4704 max_sectors
= mddev
->resync_max_sectors
;
4706 max_sectors
= mddev
->dev_sectors
;
4708 resync
= mddev
->curr_resync_completed
;
4709 return sprintf(page
, "%llu / %llu\n", resync
, max_sectors
);
4712 static struct md_sysfs_entry md_sync_completed
=
4713 __ATTR_PREALLOC(sync_completed
, S_IRUGO
, sync_completed_show
, NULL
);
4716 min_sync_show(struct mddev
*mddev
, char *page
)
4718 return sprintf(page
, "%llu\n",
4719 (unsigned long long)mddev
->resync_min
);
4722 min_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4724 unsigned long long min
;
4727 if (kstrtoull(buf
, 10, &min
))
4730 spin_lock(&mddev
->lock
);
4732 if (min
> mddev
->resync_max
)
4736 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4739 /* Round down to multiple of 4K for safety */
4740 mddev
->resync_min
= round_down(min
, 8);
4744 spin_unlock(&mddev
->lock
);
4748 static struct md_sysfs_entry md_min_sync
=
4749 __ATTR(sync_min
, S_IRUGO
|S_IWUSR
, min_sync_show
, min_sync_store
);
4752 max_sync_show(struct mddev
*mddev
, char *page
)
4754 if (mddev
->resync_max
== MaxSector
)
4755 return sprintf(page
, "max\n");
4757 return sprintf(page
, "%llu\n",
4758 (unsigned long long)mddev
->resync_max
);
4761 max_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4764 spin_lock(&mddev
->lock
);
4765 if (strncmp(buf
, "max", 3) == 0)
4766 mddev
->resync_max
= MaxSector
;
4768 unsigned long long max
;
4772 if (kstrtoull(buf
, 10, &max
))
4774 if (max
< mddev
->resync_min
)
4778 if (max
< mddev
->resync_max
&&
4780 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4783 /* Must be a multiple of chunk_size */
4784 chunk
= mddev
->chunk_sectors
;
4786 sector_t temp
= max
;
4789 if (sector_div(temp
, chunk
))
4792 mddev
->resync_max
= max
;
4794 wake_up(&mddev
->recovery_wait
);
4797 spin_unlock(&mddev
->lock
);
4801 static struct md_sysfs_entry md_max_sync
=
4802 __ATTR(sync_max
, S_IRUGO
|S_IWUSR
, max_sync_show
, max_sync_store
);
4805 suspend_lo_show(struct mddev
*mddev
, char *page
)
4807 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_lo
);
4811 suspend_lo_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4813 unsigned long long old
, new;
4816 err
= kstrtoull(buf
, 10, &new);
4819 if (new != (sector_t
)new)
4822 err
= mddev_lock(mddev
);
4826 if (mddev
->pers
== NULL
||
4827 mddev
->pers
->quiesce
== NULL
)
4829 old
= mddev
->suspend_lo
;
4830 mddev
->suspend_lo
= new;
4832 /* Shrinking suspended region */
4833 mddev
->pers
->quiesce(mddev
, 2);
4835 /* Expanding suspended region - need to wait */
4836 mddev
->pers
->quiesce(mddev
, 1);
4837 mddev
->pers
->quiesce(mddev
, 0);
4841 mddev_unlock(mddev
);
4844 static struct md_sysfs_entry md_suspend_lo
=
4845 __ATTR(suspend_lo
, S_IRUGO
|S_IWUSR
, suspend_lo_show
, suspend_lo_store
);
4848 suspend_hi_show(struct mddev
*mddev
, char *page
)
4850 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_hi
);
4854 suspend_hi_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4856 unsigned long long old
, new;
4859 err
= kstrtoull(buf
, 10, &new);
4862 if (new != (sector_t
)new)
4865 err
= mddev_lock(mddev
);
4869 if (mddev
->pers
== NULL
||
4870 mddev
->pers
->quiesce
== NULL
)
4872 old
= mddev
->suspend_hi
;
4873 mddev
->suspend_hi
= new;
4875 /* Shrinking suspended region */
4876 mddev
->pers
->quiesce(mddev
, 2);
4878 /* Expanding suspended region - need to wait */
4879 mddev
->pers
->quiesce(mddev
, 1);
4880 mddev
->pers
->quiesce(mddev
, 0);
4884 mddev_unlock(mddev
);
4887 static struct md_sysfs_entry md_suspend_hi
=
4888 __ATTR(suspend_hi
, S_IRUGO
|S_IWUSR
, suspend_hi_show
, suspend_hi_store
);
4891 reshape_position_show(struct mddev
*mddev
, char *page
)
4893 if (mddev
->reshape_position
!= MaxSector
)
4894 return sprintf(page
, "%llu\n",
4895 (unsigned long long)mddev
->reshape_position
);
4896 strcpy(page
, "none\n");
4901 reshape_position_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4903 struct md_rdev
*rdev
;
4904 unsigned long long new;
4907 err
= kstrtoull(buf
, 10, &new);
4910 if (new != (sector_t
)new)
4912 err
= mddev_lock(mddev
);
4918 mddev
->reshape_position
= new;
4919 mddev
->delta_disks
= 0;
4920 mddev
->reshape_backwards
= 0;
4921 mddev
->new_level
= mddev
->level
;
4922 mddev
->new_layout
= mddev
->layout
;
4923 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
4924 rdev_for_each(rdev
, mddev
)
4925 rdev
->new_data_offset
= rdev
->data_offset
;
4928 mddev_unlock(mddev
);
4932 static struct md_sysfs_entry md_reshape_position
=
4933 __ATTR(reshape_position
, S_IRUGO
|S_IWUSR
, reshape_position_show
,
4934 reshape_position_store
);
4937 reshape_direction_show(struct mddev
*mddev
, char *page
)
4939 return sprintf(page
, "%s\n",
4940 mddev
->reshape_backwards
? "backwards" : "forwards");
4944 reshape_direction_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4949 if (cmd_match(buf
, "forwards"))
4951 else if (cmd_match(buf
, "backwards"))
4955 if (mddev
->reshape_backwards
== backwards
)
4958 err
= mddev_lock(mddev
);
4961 /* check if we are allowed to change */
4962 if (mddev
->delta_disks
)
4964 else if (mddev
->persistent
&&
4965 mddev
->major_version
== 0)
4968 mddev
->reshape_backwards
= backwards
;
4969 mddev_unlock(mddev
);
4973 static struct md_sysfs_entry md_reshape_direction
=
4974 __ATTR(reshape_direction
, S_IRUGO
|S_IWUSR
, reshape_direction_show
,
4975 reshape_direction_store
);
4978 array_size_show(struct mddev
*mddev
, char *page
)
4980 if (mddev
->external_size
)
4981 return sprintf(page
, "%llu\n",
4982 (unsigned long long)mddev
->array_sectors
/2);
4984 return sprintf(page
, "default\n");
4988 array_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4993 err
= mddev_lock(mddev
);
4997 /* cluster raid doesn't support change array_sectors */
4998 if (mddev_is_clustered(mddev
)) {
4999 mddev_unlock(mddev
);
5003 if (strncmp(buf
, "default", 7) == 0) {
5005 sectors
= mddev
->pers
->size(mddev
, 0, 0);
5007 sectors
= mddev
->array_sectors
;
5009 mddev
->external_size
= 0;
5011 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
5013 else if (mddev
->pers
&& mddev
->pers
->size(mddev
, 0, 0) < sectors
)
5016 mddev
->external_size
= 1;
5020 mddev
->array_sectors
= sectors
;
5022 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
5023 revalidate_disk(mddev
->gendisk
);
5026 mddev_unlock(mddev
);
5030 static struct md_sysfs_entry md_array_size
=
5031 __ATTR(array_size
, S_IRUGO
|S_IWUSR
, array_size_show
,
5035 consistency_policy_show(struct mddev
*mddev
, char *page
)
5039 if (test_bit(MD_HAS_JOURNAL
, &mddev
->flags
)) {
5040 ret
= sprintf(page
, "journal\n");
5041 } else if (test_bit(MD_HAS_PPL
, &mddev
->flags
)) {
5042 ret
= sprintf(page
, "ppl\n");
5043 } else if (mddev
->bitmap
) {
5044 ret
= sprintf(page
, "bitmap\n");
5045 } else if (mddev
->pers
) {
5046 if (mddev
->pers
->sync_request
)
5047 ret
= sprintf(page
, "resync\n");
5049 ret
= sprintf(page
, "none\n");
5051 ret
= sprintf(page
, "unknown\n");
5058 consistency_policy_store(struct mddev
*mddev
, const char *buf
, size_t len
)
5063 if (mddev
->pers
->change_consistency_policy
)
5064 err
= mddev
->pers
->change_consistency_policy(mddev
, buf
);
5067 } else if (mddev
->external
&& strncmp(buf
, "ppl", 3) == 0) {
5068 set_bit(MD_HAS_PPL
, &mddev
->flags
);
5073 return err
? err
: len
;
5076 static struct md_sysfs_entry md_consistency_policy
=
5077 __ATTR(consistency_policy
, S_IRUGO
| S_IWUSR
, consistency_policy_show
,
5078 consistency_policy_store
);
5080 static struct attribute
*md_default_attrs
[] = {
5083 &md_raid_disks
.attr
,
5084 &md_chunk_size
.attr
,
5086 &md_resync_start
.attr
,
5088 &md_new_device
.attr
,
5089 &md_safe_delay
.attr
,
5090 &md_array_state
.attr
,
5091 &md_reshape_position
.attr
,
5092 &md_reshape_direction
.attr
,
5093 &md_array_size
.attr
,
5094 &max_corr_read_errors
.attr
,
5095 &md_consistency_policy
.attr
,
5099 static struct attribute
*md_redundancy_attrs
[] = {
5101 &md_last_scan_mode
.attr
,
5102 &md_mismatches
.attr
,
5105 &md_sync_speed
.attr
,
5106 &md_sync_force_parallel
.attr
,
5107 &md_sync_completed
.attr
,
5110 &md_suspend_lo
.attr
,
5111 &md_suspend_hi
.attr
,
5116 static struct attribute_group md_redundancy_group
= {
5118 .attrs
= md_redundancy_attrs
,
5122 md_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
5124 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
5125 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
5130 spin_lock(&all_mddevs_lock
);
5131 if (list_empty(&mddev
->all_mddevs
)) {
5132 spin_unlock(&all_mddevs_lock
);
5136 spin_unlock(&all_mddevs_lock
);
5138 rv
= entry
->show(mddev
, page
);
5144 md_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
5145 const char *page
, size_t length
)
5147 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
5148 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
5153 if (!capable(CAP_SYS_ADMIN
))
5155 spin_lock(&all_mddevs_lock
);
5156 if (list_empty(&mddev
->all_mddevs
)) {
5157 spin_unlock(&all_mddevs_lock
);
5161 spin_unlock(&all_mddevs_lock
);
5162 rv
= entry
->store(mddev
, page
, length
);
5167 static void md_free(struct kobject
*ko
)
5169 struct mddev
*mddev
= container_of(ko
, struct mddev
, kobj
);
5171 if (mddev
->sysfs_state
)
5172 sysfs_put(mddev
->sysfs_state
);
5175 blk_cleanup_queue(mddev
->queue
);
5176 if (mddev
->gendisk
) {
5177 del_gendisk(mddev
->gendisk
);
5178 put_disk(mddev
->gendisk
);
5180 percpu_ref_exit(&mddev
->writes_pending
);
5185 static const struct sysfs_ops md_sysfs_ops
= {
5186 .show
= md_attr_show
,
5187 .store
= md_attr_store
,
5189 static struct kobj_type md_ktype
= {
5191 .sysfs_ops
= &md_sysfs_ops
,
5192 .default_attrs
= md_default_attrs
,
5197 static void mddev_delayed_delete(struct work_struct
*ws
)
5199 struct mddev
*mddev
= container_of(ws
, struct mddev
, del_work
);
5201 sysfs_remove_group(&mddev
->kobj
, &md_bitmap_group
);
5202 kobject_del(&mddev
->kobj
);
5203 kobject_put(&mddev
->kobj
);
5206 static void no_op(struct percpu_ref
*r
) {}
5208 int mddev_init_writes_pending(struct mddev
*mddev
)
5210 if (mddev
->writes_pending
.percpu_count_ptr
)
5212 if (percpu_ref_init(&mddev
->writes_pending
, no_op
, 0, GFP_KERNEL
) < 0)
5214 /* We want to start with the refcount at zero */
5215 percpu_ref_put(&mddev
->writes_pending
);
5218 EXPORT_SYMBOL_GPL(mddev_init_writes_pending
);
5220 static int md_alloc(dev_t dev
, char *name
)
5223 * If dev is zero, name is the name of a device to allocate with
5224 * an arbitrary minor number. It will be "md_???"
5225 * If dev is non-zero it must be a device number with a MAJOR of
5226 * MD_MAJOR or mdp_major. In this case, if "name" is NULL, then
5227 * the device is being created by opening a node in /dev.
5228 * If "name" is not NULL, the device is being created by
5229 * writing to /sys/module/md_mod/parameters/new_array.
5231 static DEFINE_MUTEX(disks_mutex
);
5232 struct mddev
*mddev
= mddev_find(dev
);
5233 struct gendisk
*disk
;
5242 partitioned
= (MAJOR(mddev
->unit
) != MD_MAJOR
);
5243 shift
= partitioned
? MdpMinorShift
: 0;
5244 unit
= MINOR(mddev
->unit
) >> shift
;
5246 /* wait for any previous instance of this device to be
5247 * completely removed (mddev_delayed_delete).
5249 flush_workqueue(md_misc_wq
);
5251 mutex_lock(&disks_mutex
);
5257 /* Need to ensure that 'name' is not a duplicate.
5259 struct mddev
*mddev2
;
5260 spin_lock(&all_mddevs_lock
);
5262 list_for_each_entry(mddev2
, &all_mddevs
, all_mddevs
)
5263 if (mddev2
->gendisk
&&
5264 strcmp(mddev2
->gendisk
->disk_name
, name
) == 0) {
5265 spin_unlock(&all_mddevs_lock
);
5268 spin_unlock(&all_mddevs_lock
);
5272 * Creating /dev/mdNNN via "newarray", so adjust hold_active.
5274 mddev
->hold_active
= UNTIL_STOP
;
5277 mddev
->queue
= blk_alloc_queue(GFP_KERNEL
);
5280 mddev
->queue
->queuedata
= mddev
;
5282 blk_queue_make_request(mddev
->queue
, md_make_request
);
5283 blk_set_stacking_limits(&mddev
->queue
->limits
);
5285 disk
= alloc_disk(1 << shift
);
5287 blk_cleanup_queue(mddev
->queue
);
5288 mddev
->queue
= NULL
;
5291 disk
->major
= MAJOR(mddev
->unit
);
5292 disk
->first_minor
= unit
<< shift
;
5294 strcpy(disk
->disk_name
, name
);
5295 else if (partitioned
)
5296 sprintf(disk
->disk_name
, "md_d%d", unit
);
5298 sprintf(disk
->disk_name
, "md%d", unit
);
5299 disk
->fops
= &md_fops
;
5300 disk
->private_data
= mddev
;
5301 disk
->queue
= mddev
->queue
;
5302 blk_queue_write_cache(mddev
->queue
, true, true);
5303 /* Allow extended partitions. This makes the
5304 * 'mdp' device redundant, but we can't really
5307 disk
->flags
|= GENHD_FL_EXT_DEVT
;
5308 mddev
->gendisk
= disk
;
5309 /* As soon as we call add_disk(), another thread could get
5310 * through to md_open, so make sure it doesn't get too far
5312 mutex_lock(&mddev
->open_mutex
);
5315 error
= kobject_init_and_add(&mddev
->kobj
, &md_ktype
,
5316 &disk_to_dev(disk
)->kobj
, "%s", "md");
5318 /* This isn't possible, but as kobject_init_and_add is marked
5319 * __must_check, we must do something with the result
5321 pr_debug("md: cannot register %s/md - name in use\n",
5325 if (mddev
->kobj
.sd
&&
5326 sysfs_create_group(&mddev
->kobj
, &md_bitmap_group
))
5327 pr_debug("pointless warning\n");
5328 mutex_unlock(&mddev
->open_mutex
);
5330 mutex_unlock(&disks_mutex
);
5331 if (!error
&& mddev
->kobj
.sd
) {
5332 kobject_uevent(&mddev
->kobj
, KOBJ_ADD
);
5333 mddev
->sysfs_state
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "array_state");
5339 static struct kobject
*md_probe(dev_t dev
, int *part
, void *data
)
5342 md_alloc(dev
, NULL
);
5346 static int add_named_array(const char *val
, struct kernel_param
*kp
)
5349 * val must be "md_*" or "mdNNN".
5350 * For "md_*" we allocate an array with a large free minor number, and
5351 * set the name to val. val must not already be an active name.
5352 * For "mdNNN" we allocate an array with the minor number NNN
5353 * which must not already be in use.
5355 int len
= strlen(val
);
5356 char buf
[DISK_NAME_LEN
];
5357 unsigned long devnum
;
5359 while (len
&& val
[len
-1] == '\n')
5361 if (len
>= DISK_NAME_LEN
)
5363 strlcpy(buf
, val
, len
+1);
5364 if (strncmp(buf
, "md_", 3) == 0)
5365 return md_alloc(0, buf
);
5366 if (strncmp(buf
, "md", 2) == 0 &&
5368 kstrtoul(buf
+2, 10, &devnum
) == 0 &&
5369 devnum
<= MINORMASK
)
5370 return md_alloc(MKDEV(MD_MAJOR
, devnum
), NULL
);
5375 static void md_safemode_timeout(unsigned long data
)
5377 struct mddev
*mddev
= (struct mddev
*) data
;
5379 mddev
->safemode
= 1;
5380 if (mddev
->external
)
5381 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5383 md_wakeup_thread(mddev
->thread
);
5386 static int start_dirty_degraded
;
5388 int md_run(struct mddev
*mddev
)
5391 struct md_rdev
*rdev
;
5392 struct md_personality
*pers
;
5394 if (list_empty(&mddev
->disks
))
5395 /* cannot run an array with no devices.. */
5400 /* Cannot run until previous stop completes properly */
5401 if (mddev
->sysfs_active
)
5405 * Analyze all RAID superblock(s)
5407 if (!mddev
->raid_disks
) {
5408 if (!mddev
->persistent
)
5413 if (mddev
->level
!= LEVEL_NONE
)
5414 request_module("md-level-%d", mddev
->level
);
5415 else if (mddev
->clevel
[0])
5416 request_module("md-%s", mddev
->clevel
);
5419 * Drop all container device buffers, from now on
5420 * the only valid external interface is through the md
5423 rdev_for_each(rdev
, mddev
) {
5424 if (test_bit(Faulty
, &rdev
->flags
))
5426 sync_blockdev(rdev
->bdev
);
5427 invalidate_bdev(rdev
->bdev
);
5428 if (mddev
->ro
!= 1 &&
5429 (bdev_read_only(rdev
->bdev
) ||
5430 bdev_read_only(rdev
->meta_bdev
))) {
5433 set_disk_ro(mddev
->gendisk
, 1);
5436 /* perform some consistency tests on the device.
5437 * We don't want the data to overlap the metadata,
5438 * Internal Bitmap issues have been handled elsewhere.
5440 if (rdev
->meta_bdev
) {
5441 /* Nothing to check */;
5442 } else if (rdev
->data_offset
< rdev
->sb_start
) {
5443 if (mddev
->dev_sectors
&&
5444 rdev
->data_offset
+ mddev
->dev_sectors
5446 pr_warn("md: %s: data overlaps metadata\n",
5451 if (rdev
->sb_start
+ rdev
->sb_size
/512
5452 > rdev
->data_offset
) {
5453 pr_warn("md: %s: metadata overlaps data\n",
5458 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
5461 if (mddev
->bio_set
== NULL
) {
5462 mddev
->bio_set
= bioset_create(BIO_POOL_SIZE
, 0, BIOSET_NEED_BVECS
);
5463 if (!mddev
->bio_set
)
5466 if (mddev
->sync_set
== NULL
) {
5467 mddev
->sync_set
= bioset_create(BIO_POOL_SIZE
, 0, BIOSET_NEED_BVECS
);
5468 if (!mddev
->sync_set
)
5472 spin_lock(&pers_lock
);
5473 pers
= find_pers(mddev
->level
, mddev
->clevel
);
5474 if (!pers
|| !try_module_get(pers
->owner
)) {
5475 spin_unlock(&pers_lock
);
5476 if (mddev
->level
!= LEVEL_NONE
)
5477 pr_warn("md: personality for level %d is not loaded!\n",
5480 pr_warn("md: personality for level %s is not loaded!\n",
5484 spin_unlock(&pers_lock
);
5485 if (mddev
->level
!= pers
->level
) {
5486 mddev
->level
= pers
->level
;
5487 mddev
->new_level
= pers
->level
;
5489 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
5491 if (mddev
->reshape_position
!= MaxSector
&&
5492 pers
->start_reshape
== NULL
) {
5493 /* This personality cannot handle reshaping... */
5494 module_put(pers
->owner
);
5498 if (pers
->sync_request
) {
5499 /* Warn if this is a potentially silly
5502 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
5503 struct md_rdev
*rdev2
;
5506 rdev_for_each(rdev
, mddev
)
5507 rdev_for_each(rdev2
, mddev
) {
5509 rdev
->bdev
->bd_contains
==
5510 rdev2
->bdev
->bd_contains
) {
5511 pr_warn("%s: WARNING: %s appears to be on the same physical disk as %s.\n",
5513 bdevname(rdev
->bdev
,b
),
5514 bdevname(rdev2
->bdev
,b2
));
5520 pr_warn("True protection against single-disk failure might be compromised.\n");
5523 mddev
->recovery
= 0;
5524 /* may be over-ridden by personality */
5525 mddev
->resync_max_sectors
= mddev
->dev_sectors
;
5527 mddev
->ok_start_degraded
= start_dirty_degraded
;
5529 if (start_readonly
&& mddev
->ro
== 0)
5530 mddev
->ro
= 2; /* read-only, but switch on first write */
5533 * NOTE: some pers->run(), for example r5l_recovery_log(), wakes
5534 * up mddev->thread. It is important to initialize critical
5535 * resources for mddev->thread BEFORE calling pers->run().
5537 err
= pers
->run(mddev
);
5539 pr_warn("md: pers->run() failed ...\n");
5540 else if (pers
->size(mddev
, 0, 0) < mddev
->array_sectors
) {
5541 WARN_ONCE(!mddev
->external_size
,
5542 "%s: default size too small, but 'external_size' not in effect?\n",
5544 pr_warn("md: invalid array_size %llu > default size %llu\n",
5545 (unsigned long long)mddev
->array_sectors
/ 2,
5546 (unsigned long long)pers
->size(mddev
, 0, 0) / 2);
5549 if (err
== 0 && pers
->sync_request
&&
5550 (mddev
->bitmap_info
.file
|| mddev
->bitmap_info
.offset
)) {
5551 struct bitmap
*bitmap
;
5553 bitmap
= bitmap_create(mddev
, -1);
5554 if (IS_ERR(bitmap
)) {
5555 err
= PTR_ERR(bitmap
);
5556 pr_warn("%s: failed to create bitmap (%d)\n",
5557 mdname(mddev
), err
);
5559 mddev
->bitmap
= bitmap
;
5563 mddev_detach(mddev
);
5565 pers
->free(mddev
, mddev
->private);
5566 mddev
->private = NULL
;
5567 module_put(pers
->owner
);
5568 bitmap_destroy(mddev
);
5574 rdev_for_each(rdev
, mddev
) {
5575 if (rdev
->raid_disk
>= 0 &&
5576 !blk_queue_nonrot(bdev_get_queue(rdev
->bdev
))) {
5581 if (mddev
->degraded
)
5584 queue_flag_set_unlocked(QUEUE_FLAG_NONROT
, mddev
->queue
);
5586 queue_flag_clear_unlocked(QUEUE_FLAG_NONROT
, mddev
->queue
);
5587 mddev
->queue
->backing_dev_info
->congested_data
= mddev
;
5588 mddev
->queue
->backing_dev_info
->congested_fn
= md_congested
;
5590 if (pers
->sync_request
) {
5591 if (mddev
->kobj
.sd
&&
5592 sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
5593 pr_warn("md: cannot register extra attributes for %s\n",
5595 mddev
->sysfs_action
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "sync_action");
5596 } else if (mddev
->ro
== 2) /* auto-readonly not meaningful */
5599 atomic_set(&mddev
->max_corr_read_errors
,
5600 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS
);
5601 mddev
->safemode
= 0;
5602 if (mddev_is_clustered(mddev
))
5603 mddev
->safemode_delay
= 0;
5605 mddev
->safemode_delay
= (200 * HZ
)/1000 +1; /* 200 msec delay */
5608 spin_lock(&mddev
->lock
);
5610 spin_unlock(&mddev
->lock
);
5611 rdev_for_each(rdev
, mddev
)
5612 if (rdev
->raid_disk
>= 0)
5613 if (sysfs_link_rdev(mddev
, rdev
))
5614 /* failure here is OK */;
5616 if (mddev
->degraded
&& !mddev
->ro
)
5617 /* This ensures that recovering status is reported immediately
5618 * via sysfs - until a lack of spares is confirmed.
5620 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
5621 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5623 if (mddev
->sb_flags
)
5624 md_update_sb(mddev
, 0);
5626 md_new_event(mddev
);
5627 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5628 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
5629 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
5632 EXPORT_SYMBOL_GPL(md_run
);
5634 static int do_md_run(struct mddev
*mddev
)
5638 err
= md_run(mddev
);
5641 err
= bitmap_load(mddev
);
5643 bitmap_destroy(mddev
);
5647 if (mddev_is_clustered(mddev
))
5648 md_allow_write(mddev
);
5650 md_wakeup_thread(mddev
->thread
);
5651 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
5653 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
5654 revalidate_disk(mddev
->gendisk
);
5656 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
5661 static int restart_array(struct mddev
*mddev
)
5663 struct gendisk
*disk
= mddev
->gendisk
;
5664 struct md_rdev
*rdev
;
5665 bool has_journal
= false;
5666 bool has_readonly
= false;
5668 /* Complain if it has no devices */
5669 if (list_empty(&mddev
->disks
))
5677 rdev_for_each_rcu(rdev
, mddev
) {
5678 if (test_bit(Journal
, &rdev
->flags
) &&
5679 !test_bit(Faulty
, &rdev
->flags
))
5681 if (bdev_read_only(rdev
->bdev
))
5682 has_readonly
= true;
5685 if (test_bit(MD_HAS_JOURNAL
, &mddev
->flags
) && !has_journal
)
5686 /* Don't restart rw with journal missing/faulty */
5691 mddev
->safemode
= 0;
5693 set_disk_ro(disk
, 0);
5694 pr_debug("md: %s switched to read-write mode.\n", mdname(mddev
));
5695 /* Kick recovery or resync if necessary */
5696 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5697 md_wakeup_thread(mddev
->thread
);
5698 md_wakeup_thread(mddev
->sync_thread
);
5699 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5703 static void md_clean(struct mddev
*mddev
)
5705 mddev
->array_sectors
= 0;
5706 mddev
->external_size
= 0;
5707 mddev
->dev_sectors
= 0;
5708 mddev
->raid_disks
= 0;
5709 mddev
->recovery_cp
= 0;
5710 mddev
->resync_min
= 0;
5711 mddev
->resync_max
= MaxSector
;
5712 mddev
->reshape_position
= MaxSector
;
5713 mddev
->external
= 0;
5714 mddev
->persistent
= 0;
5715 mddev
->level
= LEVEL_NONE
;
5716 mddev
->clevel
[0] = 0;
5718 mddev
->sb_flags
= 0;
5720 mddev
->metadata_type
[0] = 0;
5721 mddev
->chunk_sectors
= 0;
5722 mddev
->ctime
= mddev
->utime
= 0;
5724 mddev
->max_disks
= 0;
5726 mddev
->can_decrease_events
= 0;
5727 mddev
->delta_disks
= 0;
5728 mddev
->reshape_backwards
= 0;
5729 mddev
->new_level
= LEVEL_NONE
;
5730 mddev
->new_layout
= 0;
5731 mddev
->new_chunk_sectors
= 0;
5732 mddev
->curr_resync
= 0;
5733 atomic64_set(&mddev
->resync_mismatches
, 0);
5734 mddev
->suspend_lo
= mddev
->suspend_hi
= 0;
5735 mddev
->sync_speed_min
= mddev
->sync_speed_max
= 0;
5736 mddev
->recovery
= 0;
5739 mddev
->degraded
= 0;
5740 mddev
->safemode
= 0;
5741 mddev
->private = NULL
;
5742 mddev
->cluster_info
= NULL
;
5743 mddev
->bitmap_info
.offset
= 0;
5744 mddev
->bitmap_info
.default_offset
= 0;
5745 mddev
->bitmap_info
.default_space
= 0;
5746 mddev
->bitmap_info
.chunksize
= 0;
5747 mddev
->bitmap_info
.daemon_sleep
= 0;
5748 mddev
->bitmap_info
.max_write_behind
= 0;
5749 mddev
->bitmap_info
.nodes
= 0;
5752 static void __md_stop_writes(struct mddev
*mddev
)
5754 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5755 flush_workqueue(md_misc_wq
);
5756 if (mddev
->sync_thread
) {
5757 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5758 md_reap_sync_thread(mddev
);
5761 del_timer_sync(&mddev
->safemode_timer
);
5763 if (mddev
->pers
&& mddev
->pers
->quiesce
) {
5764 mddev
->pers
->quiesce(mddev
, 1);
5765 mddev
->pers
->quiesce(mddev
, 0);
5767 bitmap_flush(mddev
);
5769 if (mddev
->ro
== 0 &&
5770 ((!mddev
->in_sync
&& !mddev_is_clustered(mddev
)) ||
5772 /* mark array as shutdown cleanly */
5773 if (!mddev_is_clustered(mddev
))
5775 md_update_sb(mddev
, 1);
5779 void md_stop_writes(struct mddev
*mddev
)
5781 mddev_lock_nointr(mddev
);
5782 __md_stop_writes(mddev
);
5783 mddev_unlock(mddev
);
5785 EXPORT_SYMBOL_GPL(md_stop_writes
);
5787 static void mddev_detach(struct mddev
*mddev
)
5789 bitmap_wait_behind_writes(mddev
);
5790 if (mddev
->pers
&& mddev
->pers
->quiesce
) {
5791 mddev
->pers
->quiesce(mddev
, 1);
5792 mddev
->pers
->quiesce(mddev
, 0);
5794 md_unregister_thread(&mddev
->thread
);
5796 blk_sync_queue(mddev
->queue
); /* the unplug fn references 'conf'*/
5799 static void __md_stop(struct mddev
*mddev
)
5801 struct md_personality
*pers
= mddev
->pers
;
5802 bitmap_destroy(mddev
);
5803 mddev_detach(mddev
);
5804 /* Ensure ->event_work is done */
5805 flush_workqueue(md_misc_wq
);
5806 spin_lock(&mddev
->lock
);
5808 spin_unlock(&mddev
->lock
);
5809 pers
->free(mddev
, mddev
->private);
5810 mddev
->private = NULL
;
5811 if (pers
->sync_request
&& mddev
->to_remove
== NULL
)
5812 mddev
->to_remove
= &md_redundancy_group
;
5813 module_put(pers
->owner
);
5814 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5817 void md_stop(struct mddev
*mddev
)
5819 /* stop the array and free an attached data structures.
5820 * This is called from dm-raid
5824 bioset_free(mddev
->bio_set
);
5827 EXPORT_SYMBOL_GPL(md_stop
);
5829 static int md_set_readonly(struct mddev
*mddev
, struct block_device
*bdev
)
5834 if (!test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
)) {
5836 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5837 md_wakeup_thread(mddev
->thread
);
5839 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
5840 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5841 if (mddev
->sync_thread
)
5842 /* Thread might be blocked waiting for metadata update
5843 * which will now never happen */
5844 wake_up_process(mddev
->sync_thread
->tsk
);
5846 if (mddev
->external
&& test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
))
5848 mddev_unlock(mddev
);
5849 wait_event(resync_wait
, !test_bit(MD_RECOVERY_RUNNING
,
5851 wait_event(mddev
->sb_wait
,
5852 !test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
));
5853 mddev_lock_nointr(mddev
);
5855 mutex_lock(&mddev
->open_mutex
);
5856 if ((mddev
->pers
&& atomic_read(&mddev
->openers
) > !!bdev
) ||
5857 mddev
->sync_thread
||
5858 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
)) {
5859 pr_warn("md: %s still in use.\n",mdname(mddev
));
5861 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5862 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5863 md_wakeup_thread(mddev
->thread
);
5869 __md_stop_writes(mddev
);
5875 set_disk_ro(mddev
->gendisk
, 1);
5876 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5877 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5878 md_wakeup_thread(mddev
->thread
);
5879 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5883 mutex_unlock(&mddev
->open_mutex
);
5888 * 0 - completely stop and dis-assemble array
5889 * 2 - stop but do not disassemble array
5891 static int do_md_stop(struct mddev
*mddev
, int mode
,
5892 struct block_device
*bdev
)
5894 struct gendisk
*disk
= mddev
->gendisk
;
5895 struct md_rdev
*rdev
;
5898 if (!test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
)) {
5900 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5901 md_wakeup_thread(mddev
->thread
);
5903 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
5904 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5905 if (mddev
->sync_thread
)
5906 /* Thread might be blocked waiting for metadata update
5907 * which will now never happen */
5908 wake_up_process(mddev
->sync_thread
->tsk
);
5910 mddev_unlock(mddev
);
5911 wait_event(resync_wait
, (mddev
->sync_thread
== NULL
&&
5912 !test_bit(MD_RECOVERY_RUNNING
,
5913 &mddev
->recovery
)));
5914 mddev_lock_nointr(mddev
);
5916 mutex_lock(&mddev
->open_mutex
);
5917 if ((mddev
->pers
&& atomic_read(&mddev
->openers
) > !!bdev
) ||
5918 mddev
->sysfs_active
||
5919 mddev
->sync_thread
||
5920 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
)) {
5921 pr_warn("md: %s still in use.\n",mdname(mddev
));
5922 mutex_unlock(&mddev
->open_mutex
);
5924 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5925 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5926 md_wakeup_thread(mddev
->thread
);
5932 set_disk_ro(disk
, 0);
5934 __md_stop_writes(mddev
);
5936 mddev
->queue
->backing_dev_info
->congested_fn
= NULL
;
5938 /* tell userspace to handle 'inactive' */
5939 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5941 rdev_for_each(rdev
, mddev
)
5942 if (rdev
->raid_disk
>= 0)
5943 sysfs_unlink_rdev(mddev
, rdev
);
5945 set_capacity(disk
, 0);
5946 mutex_unlock(&mddev
->open_mutex
);
5948 revalidate_disk(disk
);
5953 mutex_unlock(&mddev
->open_mutex
);
5955 * Free resources if final stop
5958 pr_info("md: %s stopped.\n", mdname(mddev
));
5960 if (mddev
->bitmap_info
.file
) {
5961 struct file
*f
= mddev
->bitmap_info
.file
;
5962 spin_lock(&mddev
->lock
);
5963 mddev
->bitmap_info
.file
= NULL
;
5964 spin_unlock(&mddev
->lock
);
5967 mddev
->bitmap_info
.offset
= 0;
5969 export_array(mddev
);
5972 if (mddev
->hold_active
== UNTIL_STOP
)
5973 mddev
->hold_active
= 0;
5975 md_new_event(mddev
);
5976 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5981 static void autorun_array(struct mddev
*mddev
)
5983 struct md_rdev
*rdev
;
5986 if (list_empty(&mddev
->disks
))
5989 pr_info("md: running: ");
5991 rdev_for_each(rdev
, mddev
) {
5992 char b
[BDEVNAME_SIZE
];
5993 pr_cont("<%s>", bdevname(rdev
->bdev
,b
));
5997 err
= do_md_run(mddev
);
5999 pr_warn("md: do_md_run() returned %d\n", err
);
6000 do_md_stop(mddev
, 0, NULL
);
6005 * lets try to run arrays based on all disks that have arrived
6006 * until now. (those are in pending_raid_disks)
6008 * the method: pick the first pending disk, collect all disks with
6009 * the same UUID, remove all from the pending list and put them into
6010 * the 'same_array' list. Then order this list based on superblock
6011 * update time (freshest comes first), kick out 'old' disks and
6012 * compare superblocks. If everything's fine then run it.
6014 * If "unit" is allocated, then bump its reference count
6016 static void autorun_devices(int part
)
6018 struct md_rdev
*rdev0
, *rdev
, *tmp
;
6019 struct mddev
*mddev
;
6020 char b
[BDEVNAME_SIZE
];
6022 pr_info("md: autorun ...\n");
6023 while (!list_empty(&pending_raid_disks
)) {
6026 LIST_HEAD(candidates
);
6027 rdev0
= list_entry(pending_raid_disks
.next
,
6028 struct md_rdev
, same_set
);
6030 pr_debug("md: considering %s ...\n", bdevname(rdev0
->bdev
,b
));
6031 INIT_LIST_HEAD(&candidates
);
6032 rdev_for_each_list(rdev
, tmp
, &pending_raid_disks
)
6033 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
6034 pr_debug("md: adding %s ...\n",
6035 bdevname(rdev
->bdev
,b
));
6036 list_move(&rdev
->same_set
, &candidates
);
6039 * now we have a set of devices, with all of them having
6040 * mostly sane superblocks. It's time to allocate the
6044 dev
= MKDEV(mdp_major
,
6045 rdev0
->preferred_minor
<< MdpMinorShift
);
6046 unit
= MINOR(dev
) >> MdpMinorShift
;
6048 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
6051 if (rdev0
->preferred_minor
!= unit
) {
6052 pr_warn("md: unit number in %s is bad: %d\n",
6053 bdevname(rdev0
->bdev
, b
), rdev0
->preferred_minor
);
6057 md_probe(dev
, NULL
, NULL
);
6058 mddev
= mddev_find(dev
);
6059 if (!mddev
|| !mddev
->gendisk
) {
6064 if (mddev_lock(mddev
))
6065 pr_warn("md: %s locked, cannot run\n", mdname(mddev
));
6066 else if (mddev
->raid_disks
|| mddev
->major_version
6067 || !list_empty(&mddev
->disks
)) {
6068 pr_warn("md: %s already running, cannot run %s\n",
6069 mdname(mddev
), bdevname(rdev0
->bdev
,b
));
6070 mddev_unlock(mddev
);
6072 pr_debug("md: created %s\n", mdname(mddev
));
6073 mddev
->persistent
= 1;
6074 rdev_for_each_list(rdev
, tmp
, &candidates
) {
6075 list_del_init(&rdev
->same_set
);
6076 if (bind_rdev_to_array(rdev
, mddev
))
6079 autorun_array(mddev
);
6080 mddev_unlock(mddev
);
6082 /* on success, candidates will be empty, on error
6085 rdev_for_each_list(rdev
, tmp
, &candidates
) {
6086 list_del_init(&rdev
->same_set
);
6091 pr_info("md: ... autorun DONE.\n");
6093 #endif /* !MODULE */
6095 static int get_version(void __user
*arg
)
6099 ver
.major
= MD_MAJOR_VERSION
;
6100 ver
.minor
= MD_MINOR_VERSION
;
6101 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
6103 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
6109 static int get_array_info(struct mddev
*mddev
, void __user
*arg
)
6111 mdu_array_info_t info
;
6112 int nr
,working
,insync
,failed
,spare
;
6113 struct md_rdev
*rdev
;
6115 nr
= working
= insync
= failed
= spare
= 0;
6117 rdev_for_each_rcu(rdev
, mddev
) {
6119 if (test_bit(Faulty
, &rdev
->flags
))
6123 if (test_bit(In_sync
, &rdev
->flags
))
6125 else if (test_bit(Journal
, &rdev
->flags
))
6126 /* TODO: add journal count to md_u.h */
6134 info
.major_version
= mddev
->major_version
;
6135 info
.minor_version
= mddev
->minor_version
;
6136 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
6137 info
.ctime
= clamp_t(time64_t
, mddev
->ctime
, 0, U32_MAX
);
6138 info
.level
= mddev
->level
;
6139 info
.size
= mddev
->dev_sectors
/ 2;
6140 if (info
.size
!= mddev
->dev_sectors
/ 2) /* overflow */
6143 info
.raid_disks
= mddev
->raid_disks
;
6144 info
.md_minor
= mddev
->md_minor
;
6145 info
.not_persistent
= !mddev
->persistent
;
6147 info
.utime
= clamp_t(time64_t
, mddev
->utime
, 0, U32_MAX
);
6150 info
.state
= (1<<MD_SB_CLEAN
);
6151 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
6152 info
.state
|= (1<<MD_SB_BITMAP_PRESENT
);
6153 if (mddev_is_clustered(mddev
))
6154 info
.state
|= (1<<MD_SB_CLUSTERED
);
6155 info
.active_disks
= insync
;
6156 info
.working_disks
= working
;
6157 info
.failed_disks
= failed
;
6158 info
.spare_disks
= spare
;
6160 info
.layout
= mddev
->layout
;
6161 info
.chunk_size
= mddev
->chunk_sectors
<< 9;
6163 if (copy_to_user(arg
, &info
, sizeof(info
)))
6169 static int get_bitmap_file(struct mddev
*mddev
, void __user
* arg
)
6171 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
6175 file
= kzalloc(sizeof(*file
), GFP_NOIO
);
6180 spin_lock(&mddev
->lock
);
6181 /* bitmap enabled */
6182 if (mddev
->bitmap_info
.file
) {
6183 ptr
= file_path(mddev
->bitmap_info
.file
, file
->pathname
,
6184 sizeof(file
->pathname
));
6188 memmove(file
->pathname
, ptr
,
6189 sizeof(file
->pathname
)-(ptr
-file
->pathname
));
6191 spin_unlock(&mddev
->lock
);
6194 copy_to_user(arg
, file
, sizeof(*file
)))
6201 static int get_disk_info(struct mddev
*mddev
, void __user
* arg
)
6203 mdu_disk_info_t info
;
6204 struct md_rdev
*rdev
;
6206 if (copy_from_user(&info
, arg
, sizeof(info
)))
6210 rdev
= md_find_rdev_nr_rcu(mddev
, info
.number
);
6212 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
6213 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
6214 info
.raid_disk
= rdev
->raid_disk
;
6216 if (test_bit(Faulty
, &rdev
->flags
))
6217 info
.state
|= (1<<MD_DISK_FAULTY
);
6218 else if (test_bit(In_sync
, &rdev
->flags
)) {
6219 info
.state
|= (1<<MD_DISK_ACTIVE
);
6220 info
.state
|= (1<<MD_DISK_SYNC
);
6222 if (test_bit(Journal
, &rdev
->flags
))
6223 info
.state
|= (1<<MD_DISK_JOURNAL
);
6224 if (test_bit(WriteMostly
, &rdev
->flags
))
6225 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
6226 if (test_bit(FailFast
, &rdev
->flags
))
6227 info
.state
|= (1<<MD_DISK_FAILFAST
);
6229 info
.major
= info
.minor
= 0;
6230 info
.raid_disk
= -1;
6231 info
.state
= (1<<MD_DISK_REMOVED
);
6235 if (copy_to_user(arg
, &info
, sizeof(info
)))
6241 static int add_new_disk(struct mddev
*mddev
, mdu_disk_info_t
*info
)
6243 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
6244 struct md_rdev
*rdev
;
6245 dev_t dev
= MKDEV(info
->major
,info
->minor
);
6247 if (mddev_is_clustered(mddev
) &&
6248 !(info
->state
& ((1 << MD_DISK_CLUSTER_ADD
) | (1 << MD_DISK_CANDIDATE
)))) {
6249 pr_warn("%s: Cannot add to clustered mddev.\n",
6254 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
6257 if (!mddev
->raid_disks
) {
6259 /* expecting a device which has a superblock */
6260 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
6262 pr_warn("md: md_import_device returned %ld\n",
6264 return PTR_ERR(rdev
);
6266 if (!list_empty(&mddev
->disks
)) {
6267 struct md_rdev
*rdev0
6268 = list_entry(mddev
->disks
.next
,
6269 struct md_rdev
, same_set
);
6270 err
= super_types
[mddev
->major_version
]
6271 .load_super(rdev
, rdev0
, mddev
->minor_version
);
6273 pr_warn("md: %s has different UUID to %s\n",
6274 bdevname(rdev
->bdev
,b
),
6275 bdevname(rdev0
->bdev
,b2
));
6280 err
= bind_rdev_to_array(rdev
, mddev
);
6287 * add_new_disk can be used once the array is assembled
6288 * to add "hot spares". They must already have a superblock
6293 if (!mddev
->pers
->hot_add_disk
) {
6294 pr_warn("%s: personality does not support diskops!\n",
6298 if (mddev
->persistent
)
6299 rdev
= md_import_device(dev
, mddev
->major_version
,
6300 mddev
->minor_version
);
6302 rdev
= md_import_device(dev
, -1, -1);
6304 pr_warn("md: md_import_device returned %ld\n",
6306 return PTR_ERR(rdev
);
6308 /* set saved_raid_disk if appropriate */
6309 if (!mddev
->persistent
) {
6310 if (info
->state
& (1<<MD_DISK_SYNC
) &&
6311 info
->raid_disk
< mddev
->raid_disks
) {
6312 rdev
->raid_disk
= info
->raid_disk
;
6313 set_bit(In_sync
, &rdev
->flags
);
6314 clear_bit(Bitmap_sync
, &rdev
->flags
);
6316 rdev
->raid_disk
= -1;
6317 rdev
->saved_raid_disk
= rdev
->raid_disk
;
6319 super_types
[mddev
->major_version
].
6320 validate_super(mddev
, rdev
);
6321 if ((info
->state
& (1<<MD_DISK_SYNC
)) &&
6322 rdev
->raid_disk
!= info
->raid_disk
) {
6323 /* This was a hot-add request, but events doesn't
6324 * match, so reject it.
6330 clear_bit(In_sync
, &rdev
->flags
); /* just to be sure */
6331 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
6332 set_bit(WriteMostly
, &rdev
->flags
);
6334 clear_bit(WriteMostly
, &rdev
->flags
);
6335 if (info
->state
& (1<<MD_DISK_FAILFAST
))
6336 set_bit(FailFast
, &rdev
->flags
);
6338 clear_bit(FailFast
, &rdev
->flags
);
6340 if (info
->state
& (1<<MD_DISK_JOURNAL
)) {
6341 struct md_rdev
*rdev2
;
6342 bool has_journal
= false;
6344 /* make sure no existing journal disk */
6345 rdev_for_each(rdev2
, mddev
) {
6346 if (test_bit(Journal
, &rdev2
->flags
)) {
6355 set_bit(Journal
, &rdev
->flags
);
6358 * check whether the device shows up in other nodes
6360 if (mddev_is_clustered(mddev
)) {
6361 if (info
->state
& (1 << MD_DISK_CANDIDATE
))
6362 set_bit(Candidate
, &rdev
->flags
);
6363 else if (info
->state
& (1 << MD_DISK_CLUSTER_ADD
)) {
6364 /* --add initiated by this node */
6365 err
= md_cluster_ops
->add_new_disk(mddev
, rdev
);
6373 rdev
->raid_disk
= -1;
6374 err
= bind_rdev_to_array(rdev
, mddev
);
6379 if (mddev_is_clustered(mddev
)) {
6380 if (info
->state
& (1 << MD_DISK_CANDIDATE
)) {
6382 err
= md_cluster_ops
->new_disk_ack(mddev
,
6385 md_kick_rdev_from_array(rdev
);
6389 md_cluster_ops
->add_new_disk_cancel(mddev
);
6391 err
= add_bound_rdev(rdev
);
6395 err
= add_bound_rdev(rdev
);
6400 /* otherwise, add_new_disk is only allowed
6401 * for major_version==0 superblocks
6403 if (mddev
->major_version
!= 0) {
6404 pr_warn("%s: ADD_NEW_DISK not supported\n", mdname(mddev
));
6408 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
6410 rdev
= md_import_device(dev
, -1, 0);
6412 pr_warn("md: error, md_import_device() returned %ld\n",
6414 return PTR_ERR(rdev
);
6416 rdev
->desc_nr
= info
->number
;
6417 if (info
->raid_disk
< mddev
->raid_disks
)
6418 rdev
->raid_disk
= info
->raid_disk
;
6420 rdev
->raid_disk
= -1;
6422 if (rdev
->raid_disk
< mddev
->raid_disks
)
6423 if (info
->state
& (1<<MD_DISK_SYNC
))
6424 set_bit(In_sync
, &rdev
->flags
);
6426 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
6427 set_bit(WriteMostly
, &rdev
->flags
);
6428 if (info
->state
& (1<<MD_DISK_FAILFAST
))
6429 set_bit(FailFast
, &rdev
->flags
);
6431 if (!mddev
->persistent
) {
6432 pr_debug("md: nonpersistent superblock ...\n");
6433 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
6435 rdev
->sb_start
= calc_dev_sboffset(rdev
);
6436 rdev
->sectors
= rdev
->sb_start
;
6438 err
= bind_rdev_to_array(rdev
, mddev
);
6448 static int hot_remove_disk(struct mddev
*mddev
, dev_t dev
)
6450 char b
[BDEVNAME_SIZE
];
6451 struct md_rdev
*rdev
;
6453 rdev
= find_rdev(mddev
, dev
);
6457 if (rdev
->raid_disk
< 0)
6460 clear_bit(Blocked
, &rdev
->flags
);
6461 remove_and_add_spares(mddev
, rdev
);
6463 if (rdev
->raid_disk
>= 0)
6467 if (mddev_is_clustered(mddev
))
6468 md_cluster_ops
->remove_disk(mddev
, rdev
);
6470 md_kick_rdev_from_array(rdev
);
6471 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
6473 md_wakeup_thread(mddev
->thread
);
6475 md_update_sb(mddev
, 1);
6476 md_new_event(mddev
);
6480 pr_debug("md: cannot remove active disk %s from %s ...\n",
6481 bdevname(rdev
->bdev
,b
), mdname(mddev
));
6485 static int hot_add_disk(struct mddev
*mddev
, dev_t dev
)
6487 char b
[BDEVNAME_SIZE
];
6489 struct md_rdev
*rdev
;
6494 if (mddev
->major_version
!= 0) {
6495 pr_warn("%s: HOT_ADD may only be used with version-0 superblocks.\n",
6499 if (!mddev
->pers
->hot_add_disk
) {
6500 pr_warn("%s: personality does not support diskops!\n",
6505 rdev
= md_import_device(dev
, -1, 0);
6507 pr_warn("md: error, md_import_device() returned %ld\n",
6512 if (mddev
->persistent
)
6513 rdev
->sb_start
= calc_dev_sboffset(rdev
);
6515 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
6517 rdev
->sectors
= rdev
->sb_start
;
6519 if (test_bit(Faulty
, &rdev
->flags
)) {
6520 pr_warn("md: can not hot-add faulty %s disk to %s!\n",
6521 bdevname(rdev
->bdev
,b
), mdname(mddev
));
6526 clear_bit(In_sync
, &rdev
->flags
);
6528 rdev
->saved_raid_disk
= -1;
6529 err
= bind_rdev_to_array(rdev
, mddev
);
6534 * The rest should better be atomic, we can have disk failures
6535 * noticed in interrupt contexts ...
6538 rdev
->raid_disk
= -1;
6540 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
6542 md_update_sb(mddev
, 1);
6544 * Kick recovery, maybe this spare has to be added to the
6545 * array immediately.
6547 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6548 md_wakeup_thread(mddev
->thread
);
6549 md_new_event(mddev
);
6557 static int set_bitmap_file(struct mddev
*mddev
, int fd
)
6562 if (!mddev
->pers
->quiesce
|| !mddev
->thread
)
6564 if (mddev
->recovery
|| mddev
->sync_thread
)
6566 /* we should be able to change the bitmap.. */
6570 struct inode
*inode
;
6573 if (mddev
->bitmap
|| mddev
->bitmap_info
.file
)
6574 return -EEXIST
; /* cannot add when bitmap is present */
6578 pr_warn("%s: error: failed to get bitmap file\n",
6583 inode
= f
->f_mapping
->host
;
6584 if (!S_ISREG(inode
->i_mode
)) {
6585 pr_warn("%s: error: bitmap file must be a regular file\n",
6588 } else if (!(f
->f_mode
& FMODE_WRITE
)) {
6589 pr_warn("%s: error: bitmap file must open for write\n",
6592 } else if (atomic_read(&inode
->i_writecount
) != 1) {
6593 pr_warn("%s: error: bitmap file is already in use\n",
6601 mddev
->bitmap_info
.file
= f
;
6602 mddev
->bitmap_info
.offset
= 0; /* file overrides offset */
6603 } else if (mddev
->bitmap
== NULL
)
6604 return -ENOENT
; /* cannot remove what isn't there */
6607 mddev
->pers
->quiesce(mddev
, 1);
6609 struct bitmap
*bitmap
;
6611 bitmap
= bitmap_create(mddev
, -1);
6612 if (!IS_ERR(bitmap
)) {
6613 mddev
->bitmap
= bitmap
;
6614 err
= bitmap_load(mddev
);
6616 err
= PTR_ERR(bitmap
);
6618 if (fd
< 0 || err
) {
6619 bitmap_destroy(mddev
);
6620 fd
= -1; /* make sure to put the file */
6622 mddev
->pers
->quiesce(mddev
, 0);
6625 struct file
*f
= mddev
->bitmap_info
.file
;
6627 spin_lock(&mddev
->lock
);
6628 mddev
->bitmap_info
.file
= NULL
;
6629 spin_unlock(&mddev
->lock
);
6638 * set_array_info is used two different ways
6639 * The original usage is when creating a new array.
6640 * In this usage, raid_disks is > 0 and it together with
6641 * level, size, not_persistent,layout,chunksize determine the
6642 * shape of the array.
6643 * This will always create an array with a type-0.90.0 superblock.
6644 * The newer usage is when assembling an array.
6645 * In this case raid_disks will be 0, and the major_version field is
6646 * use to determine which style super-blocks are to be found on the devices.
6647 * The minor and patch _version numbers are also kept incase the
6648 * super_block handler wishes to interpret them.
6650 static int set_array_info(struct mddev
*mddev
, mdu_array_info_t
*info
)
6653 if (info
->raid_disks
== 0) {
6654 /* just setting version number for superblock loading */
6655 if (info
->major_version
< 0 ||
6656 info
->major_version
>= ARRAY_SIZE(super_types
) ||
6657 super_types
[info
->major_version
].name
== NULL
) {
6658 /* maybe try to auto-load a module? */
6659 pr_warn("md: superblock version %d not known\n",
6660 info
->major_version
);
6663 mddev
->major_version
= info
->major_version
;
6664 mddev
->minor_version
= info
->minor_version
;
6665 mddev
->patch_version
= info
->patch_version
;
6666 mddev
->persistent
= !info
->not_persistent
;
6667 /* ensure mddev_put doesn't delete this now that there
6668 * is some minimal configuration.
6670 mddev
->ctime
= ktime_get_real_seconds();
6673 mddev
->major_version
= MD_MAJOR_VERSION
;
6674 mddev
->minor_version
= MD_MINOR_VERSION
;
6675 mddev
->patch_version
= MD_PATCHLEVEL_VERSION
;
6676 mddev
->ctime
= ktime_get_real_seconds();
6678 mddev
->level
= info
->level
;
6679 mddev
->clevel
[0] = 0;
6680 mddev
->dev_sectors
= 2 * (sector_t
)info
->size
;
6681 mddev
->raid_disks
= info
->raid_disks
;
6682 /* don't set md_minor, it is determined by which /dev/md* was
6685 if (info
->state
& (1<<MD_SB_CLEAN
))
6686 mddev
->recovery_cp
= MaxSector
;
6688 mddev
->recovery_cp
= 0;
6689 mddev
->persistent
= ! info
->not_persistent
;
6690 mddev
->external
= 0;
6692 mddev
->layout
= info
->layout
;
6693 mddev
->chunk_sectors
= info
->chunk_size
>> 9;
6695 if (mddev
->persistent
) {
6696 mddev
->max_disks
= MD_SB_DISKS
;
6698 mddev
->sb_flags
= 0;
6700 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
6702 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
6703 mddev
->bitmap_info
.default_space
= 64*2 - (MD_SB_BYTES
>> 9);
6704 mddev
->bitmap_info
.offset
= 0;
6706 mddev
->reshape_position
= MaxSector
;
6709 * Generate a 128 bit UUID
6711 get_random_bytes(mddev
->uuid
, 16);
6713 mddev
->new_level
= mddev
->level
;
6714 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
6715 mddev
->new_layout
= mddev
->layout
;
6716 mddev
->delta_disks
= 0;
6717 mddev
->reshape_backwards
= 0;
6722 void md_set_array_sectors(struct mddev
*mddev
, sector_t array_sectors
)
6724 WARN(!mddev_is_locked(mddev
), "%s: unlocked mddev!\n", __func__
);
6726 if (mddev
->external_size
)
6729 mddev
->array_sectors
= array_sectors
;
6731 EXPORT_SYMBOL(md_set_array_sectors
);
6733 static int update_size(struct mddev
*mddev
, sector_t num_sectors
)
6735 struct md_rdev
*rdev
;
6737 int fit
= (num_sectors
== 0);
6738 sector_t old_dev_sectors
= mddev
->dev_sectors
;
6740 if (mddev
->pers
->resize
== NULL
)
6742 /* The "num_sectors" is the number of sectors of each device that
6743 * is used. This can only make sense for arrays with redundancy.
6744 * linear and raid0 always use whatever space is available. We can only
6745 * consider changing this number if no resync or reconstruction is
6746 * happening, and if the new size is acceptable. It must fit before the
6747 * sb_start or, if that is <data_offset, it must fit before the size
6748 * of each device. If num_sectors is zero, we find the largest size
6751 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
6757 rdev_for_each(rdev
, mddev
) {
6758 sector_t avail
= rdev
->sectors
;
6760 if (fit
&& (num_sectors
== 0 || num_sectors
> avail
))
6761 num_sectors
= avail
;
6762 if (avail
< num_sectors
)
6765 rv
= mddev
->pers
->resize(mddev
, num_sectors
);
6767 if (mddev_is_clustered(mddev
))
6768 md_cluster_ops
->update_size(mddev
, old_dev_sectors
);
6769 else if (mddev
->queue
) {
6770 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
6771 revalidate_disk(mddev
->gendisk
);
6777 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
)
6780 struct md_rdev
*rdev
;
6781 /* change the number of raid disks */
6782 if (mddev
->pers
->check_reshape
== NULL
)
6786 if (raid_disks
<= 0 ||
6787 (mddev
->max_disks
&& raid_disks
>= mddev
->max_disks
))
6789 if (mddev
->sync_thread
||
6790 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
6791 mddev
->reshape_position
!= MaxSector
)
6794 rdev_for_each(rdev
, mddev
) {
6795 if (mddev
->raid_disks
< raid_disks
&&
6796 rdev
->data_offset
< rdev
->new_data_offset
)
6798 if (mddev
->raid_disks
> raid_disks
&&
6799 rdev
->data_offset
> rdev
->new_data_offset
)
6803 mddev
->delta_disks
= raid_disks
- mddev
->raid_disks
;
6804 if (mddev
->delta_disks
< 0)
6805 mddev
->reshape_backwards
= 1;
6806 else if (mddev
->delta_disks
> 0)
6807 mddev
->reshape_backwards
= 0;
6809 rv
= mddev
->pers
->check_reshape(mddev
);
6811 mddev
->delta_disks
= 0;
6812 mddev
->reshape_backwards
= 0;
6818 * update_array_info is used to change the configuration of an
6820 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
6821 * fields in the info are checked against the array.
6822 * Any differences that cannot be handled will cause an error.
6823 * Normally, only one change can be managed at a time.
6825 static int update_array_info(struct mddev
*mddev
, mdu_array_info_t
*info
)
6831 /* calculate expected state,ignoring low bits */
6832 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
6833 state
|= (1 << MD_SB_BITMAP_PRESENT
);
6835 if (mddev
->major_version
!= info
->major_version
||
6836 mddev
->minor_version
!= info
->minor_version
||
6837 /* mddev->patch_version != info->patch_version || */
6838 mddev
->ctime
!= info
->ctime
||
6839 mddev
->level
!= info
->level
||
6840 /* mddev->layout != info->layout || */
6841 mddev
->persistent
!= !info
->not_persistent
||
6842 mddev
->chunk_sectors
!= info
->chunk_size
>> 9 ||
6843 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
6844 ((state
^info
->state
) & 0xfffffe00)
6847 /* Check there is only one change */
6848 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
6850 if (mddev
->raid_disks
!= info
->raid_disks
)
6852 if (mddev
->layout
!= info
->layout
)
6854 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
))
6861 if (mddev
->layout
!= info
->layout
) {
6863 * we don't need to do anything at the md level, the
6864 * personality will take care of it all.
6866 if (mddev
->pers
->check_reshape
== NULL
)
6869 mddev
->new_layout
= info
->layout
;
6870 rv
= mddev
->pers
->check_reshape(mddev
);
6872 mddev
->new_layout
= mddev
->layout
;
6876 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
6877 rv
= update_size(mddev
, (sector_t
)info
->size
* 2);
6879 if (mddev
->raid_disks
!= info
->raid_disks
)
6880 rv
= update_raid_disks(mddev
, info
->raid_disks
);
6882 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) {
6883 if (mddev
->pers
->quiesce
== NULL
|| mddev
->thread
== NULL
) {
6887 if (mddev
->recovery
|| mddev
->sync_thread
) {
6891 if (info
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
6892 struct bitmap
*bitmap
;
6893 /* add the bitmap */
6894 if (mddev
->bitmap
) {
6898 if (mddev
->bitmap_info
.default_offset
== 0) {
6902 mddev
->bitmap_info
.offset
=
6903 mddev
->bitmap_info
.default_offset
;
6904 mddev
->bitmap_info
.space
=
6905 mddev
->bitmap_info
.default_space
;
6906 mddev
->pers
->quiesce(mddev
, 1);
6907 bitmap
= bitmap_create(mddev
, -1);
6908 if (!IS_ERR(bitmap
)) {
6909 mddev
->bitmap
= bitmap
;
6910 rv
= bitmap_load(mddev
);
6912 rv
= PTR_ERR(bitmap
);
6914 bitmap_destroy(mddev
);
6915 mddev
->pers
->quiesce(mddev
, 0);
6917 /* remove the bitmap */
6918 if (!mddev
->bitmap
) {
6922 if (mddev
->bitmap
->storage
.file
) {
6926 if (mddev
->bitmap_info
.nodes
) {
6927 /* hold PW on all the bitmap lock */
6928 if (md_cluster_ops
->lock_all_bitmaps(mddev
) <= 0) {
6929 pr_warn("md: can't change bitmap to none since the array is in use by more than one node\n");
6931 md_cluster_ops
->unlock_all_bitmaps(mddev
);
6935 mddev
->bitmap_info
.nodes
= 0;
6936 md_cluster_ops
->leave(mddev
);
6938 mddev
->pers
->quiesce(mddev
, 1);
6939 bitmap_destroy(mddev
);
6940 mddev
->pers
->quiesce(mddev
, 0);
6941 mddev
->bitmap_info
.offset
= 0;
6944 md_update_sb(mddev
, 1);
6950 static int set_disk_faulty(struct mddev
*mddev
, dev_t dev
)
6952 struct md_rdev
*rdev
;
6955 if (mddev
->pers
== NULL
)
6959 rdev
= find_rdev_rcu(mddev
, dev
);
6963 md_error(mddev
, rdev
);
6964 if (!test_bit(Faulty
, &rdev
->flags
))
6972 * We have a problem here : there is no easy way to give a CHS
6973 * virtual geometry. We currently pretend that we have a 2 heads
6974 * 4 sectors (with a BIG number of cylinders...). This drives
6975 * dosfs just mad... ;-)
6977 static int md_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
6979 struct mddev
*mddev
= bdev
->bd_disk
->private_data
;
6983 geo
->cylinders
= mddev
->array_sectors
/ 8;
6987 static inline bool md_ioctl_valid(unsigned int cmd
)
6992 case GET_ARRAY_INFO
:
6993 case GET_BITMAP_FILE
:
6996 case HOT_REMOVE_DISK
:
6999 case RESTART_ARRAY_RW
:
7001 case SET_ARRAY_INFO
:
7002 case SET_BITMAP_FILE
:
7003 case SET_DISK_FAULTY
:
7006 case CLUSTERED_DISK_NACK
:
7013 static int md_ioctl(struct block_device
*bdev
, fmode_t mode
,
7014 unsigned int cmd
, unsigned long arg
)
7017 void __user
*argp
= (void __user
*)arg
;
7018 struct mddev
*mddev
= NULL
;
7020 bool did_set_md_closing
= false;
7022 if (!md_ioctl_valid(cmd
))
7027 case GET_ARRAY_INFO
:
7031 if (!capable(CAP_SYS_ADMIN
))
7036 * Commands dealing with the RAID driver but not any
7041 err
= get_version(argp
);
7047 autostart_arrays(arg
);
7054 * Commands creating/starting a new array:
7057 mddev
= bdev
->bd_disk
->private_data
;
7064 /* Some actions do not requires the mutex */
7066 case GET_ARRAY_INFO
:
7067 if (!mddev
->raid_disks
&& !mddev
->external
)
7070 err
= get_array_info(mddev
, argp
);
7074 if (!mddev
->raid_disks
&& !mddev
->external
)
7077 err
= get_disk_info(mddev
, argp
);
7080 case SET_DISK_FAULTY
:
7081 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
7084 case GET_BITMAP_FILE
:
7085 err
= get_bitmap_file(mddev
, argp
);
7090 if (cmd
== ADD_NEW_DISK
)
7091 /* need to ensure md_delayed_delete() has completed */
7092 flush_workqueue(md_misc_wq
);
7094 if (cmd
== HOT_REMOVE_DISK
)
7095 /* need to ensure recovery thread has run */
7096 wait_event_interruptible_timeout(mddev
->sb_wait
,
7097 !test_bit(MD_RECOVERY_NEEDED
,
7099 msecs_to_jiffies(5000));
7100 if (cmd
== STOP_ARRAY
|| cmd
== STOP_ARRAY_RO
) {
7101 /* Need to flush page cache, and ensure no-one else opens
7104 mutex_lock(&mddev
->open_mutex
);
7105 if (mddev
->pers
&& atomic_read(&mddev
->openers
) > 1) {
7106 mutex_unlock(&mddev
->open_mutex
);
7110 WARN_ON_ONCE(test_bit(MD_CLOSING
, &mddev
->flags
));
7111 set_bit(MD_CLOSING
, &mddev
->flags
);
7112 did_set_md_closing
= true;
7113 mutex_unlock(&mddev
->open_mutex
);
7114 sync_blockdev(bdev
);
7116 err
= mddev_lock(mddev
);
7118 pr_debug("md: ioctl lock interrupted, reason %d, cmd %d\n",
7123 if (cmd
== SET_ARRAY_INFO
) {
7124 mdu_array_info_t info
;
7126 memset(&info
, 0, sizeof(info
));
7127 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
7132 err
= update_array_info(mddev
, &info
);
7134 pr_warn("md: couldn't update array info. %d\n", err
);
7139 if (!list_empty(&mddev
->disks
)) {
7140 pr_warn("md: array %s already has disks!\n", mdname(mddev
));
7144 if (mddev
->raid_disks
) {
7145 pr_warn("md: array %s already initialised!\n", mdname(mddev
));
7149 err
= set_array_info(mddev
, &info
);
7151 pr_warn("md: couldn't set array info. %d\n", err
);
7158 * Commands querying/configuring an existing array:
7160 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
7161 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
7162 if ((!mddev
->raid_disks
&& !mddev
->external
)
7163 && cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
7164 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
7165 && cmd
!= GET_BITMAP_FILE
) {
7171 * Commands even a read-only array can execute:
7174 case RESTART_ARRAY_RW
:
7175 err
= restart_array(mddev
);
7179 err
= do_md_stop(mddev
, 0, bdev
);
7183 err
= md_set_readonly(mddev
, bdev
);
7186 case HOT_REMOVE_DISK
:
7187 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
7191 /* We can support ADD_NEW_DISK on read-only arrays
7192 * only if we are re-adding a preexisting device.
7193 * So require mddev->pers and MD_DISK_SYNC.
7196 mdu_disk_info_t info
;
7197 if (copy_from_user(&info
, argp
, sizeof(info
)))
7199 else if (!(info
.state
& (1<<MD_DISK_SYNC
)))
7200 /* Need to clear read-only for this */
7203 err
= add_new_disk(mddev
, &info
);
7209 if (get_user(ro
, (int __user
*)(arg
))) {
7215 /* if the bdev is going readonly the value of mddev->ro
7216 * does not matter, no writes are coming
7221 /* are we are already prepared for writes? */
7225 /* transitioning to readauto need only happen for
7226 * arrays that call md_write_start
7229 err
= restart_array(mddev
);
7232 set_disk_ro(mddev
->gendisk
, 0);
7239 * The remaining ioctls are changing the state of the
7240 * superblock, so we do not allow them on read-only arrays.
7242 if (mddev
->ro
&& mddev
->pers
) {
7243 if (mddev
->ro
== 2) {
7245 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7246 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7247 /* mddev_unlock will wake thread */
7248 /* If a device failed while we were read-only, we
7249 * need to make sure the metadata is updated now.
7251 if (test_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
)) {
7252 mddev_unlock(mddev
);
7253 wait_event(mddev
->sb_wait
,
7254 !test_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
) &&
7255 !test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
));
7256 mddev_lock_nointr(mddev
);
7267 mdu_disk_info_t info
;
7268 if (copy_from_user(&info
, argp
, sizeof(info
)))
7271 err
= add_new_disk(mddev
, &info
);
7275 case CLUSTERED_DISK_NACK
:
7276 if (mddev_is_clustered(mddev
))
7277 md_cluster_ops
->new_disk_ack(mddev
, false);
7283 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
7287 err
= do_md_run(mddev
);
7290 case SET_BITMAP_FILE
:
7291 err
= set_bitmap_file(mddev
, (int)arg
);
7300 if (mddev
->hold_active
== UNTIL_IOCTL
&&
7302 mddev
->hold_active
= 0;
7303 mddev_unlock(mddev
);
7305 if(did_set_md_closing
)
7306 clear_bit(MD_CLOSING
, &mddev
->flags
);
7309 #ifdef CONFIG_COMPAT
7310 static int md_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
7311 unsigned int cmd
, unsigned long arg
)
7314 case HOT_REMOVE_DISK
:
7316 case SET_DISK_FAULTY
:
7317 case SET_BITMAP_FILE
:
7318 /* These take in integer arg, do not convert */
7321 arg
= (unsigned long)compat_ptr(arg
);
7325 return md_ioctl(bdev
, mode
, cmd
, arg
);
7327 #endif /* CONFIG_COMPAT */
7329 static int md_open(struct block_device
*bdev
, fmode_t mode
)
7332 * Succeed if we can lock the mddev, which confirms that
7333 * it isn't being stopped right now.
7335 struct mddev
*mddev
= mddev_find(bdev
->bd_dev
);
7341 if (mddev
->gendisk
!= bdev
->bd_disk
) {
7342 /* we are racing with mddev_put which is discarding this
7346 /* Wait until bdev->bd_disk is definitely gone */
7347 flush_workqueue(md_misc_wq
);
7348 /* Then retry the open from the top */
7349 return -ERESTARTSYS
;
7351 BUG_ON(mddev
!= bdev
->bd_disk
->private_data
);
7353 if ((err
= mutex_lock_interruptible(&mddev
->open_mutex
)))
7356 if (test_bit(MD_CLOSING
, &mddev
->flags
)) {
7357 mutex_unlock(&mddev
->open_mutex
);
7363 atomic_inc(&mddev
->openers
);
7364 mutex_unlock(&mddev
->open_mutex
);
7366 check_disk_change(bdev
);
7373 static void md_release(struct gendisk
*disk
, fmode_t mode
)
7375 struct mddev
*mddev
= disk
->private_data
;
7378 atomic_dec(&mddev
->openers
);
7382 static int md_media_changed(struct gendisk
*disk
)
7384 struct mddev
*mddev
= disk
->private_data
;
7386 return mddev
->changed
;
7389 static int md_revalidate(struct gendisk
*disk
)
7391 struct mddev
*mddev
= disk
->private_data
;
7396 static const struct block_device_operations md_fops
=
7398 .owner
= THIS_MODULE
,
7400 .release
= md_release
,
7402 #ifdef CONFIG_COMPAT
7403 .compat_ioctl
= md_compat_ioctl
,
7405 .getgeo
= md_getgeo
,
7406 .media_changed
= md_media_changed
,
7407 .revalidate_disk
= md_revalidate
,
7410 static int md_thread(void *arg
)
7412 struct md_thread
*thread
= arg
;
7415 * md_thread is a 'system-thread', it's priority should be very
7416 * high. We avoid resource deadlocks individually in each
7417 * raid personality. (RAID5 does preallocation) We also use RR and
7418 * the very same RT priority as kswapd, thus we will never get
7419 * into a priority inversion deadlock.
7421 * we definitely have to have equal or higher priority than
7422 * bdflush, otherwise bdflush will deadlock if there are too
7423 * many dirty RAID5 blocks.
7426 allow_signal(SIGKILL
);
7427 while (!kthread_should_stop()) {
7429 /* We need to wait INTERRUPTIBLE so that
7430 * we don't add to the load-average.
7431 * That means we need to be sure no signals are
7434 if (signal_pending(current
))
7435 flush_signals(current
);
7437 wait_event_interruptible_timeout
7439 test_bit(THREAD_WAKEUP
, &thread
->flags
)
7440 || kthread_should_stop() || kthread_should_park(),
7443 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
7444 if (kthread_should_park())
7446 if (!kthread_should_stop())
7447 thread
->run(thread
);
7453 void md_wakeup_thread(struct md_thread
*thread
)
7456 pr_debug("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
7457 if (!test_and_set_bit(THREAD_WAKEUP
, &thread
->flags
))
7458 wake_up(&thread
->wqueue
);
7461 EXPORT_SYMBOL(md_wakeup_thread
);
7463 struct md_thread
*md_register_thread(void (*run
) (struct md_thread
*),
7464 struct mddev
*mddev
, const char *name
)
7466 struct md_thread
*thread
;
7468 thread
= kzalloc(sizeof(struct md_thread
), GFP_KERNEL
);
7472 init_waitqueue_head(&thread
->wqueue
);
7475 thread
->mddev
= mddev
;
7476 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
7477 thread
->tsk
= kthread_run(md_thread
, thread
,
7479 mdname(thread
->mddev
),
7481 if (IS_ERR(thread
->tsk
)) {
7487 EXPORT_SYMBOL(md_register_thread
);
7489 void md_unregister_thread(struct md_thread
**threadp
)
7491 struct md_thread
*thread
= *threadp
;
7494 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread
->tsk
));
7495 /* Locking ensures that mddev_unlock does not wake_up a
7496 * non-existent thread
7498 spin_lock(&pers_lock
);
7500 spin_unlock(&pers_lock
);
7502 kthread_stop(thread
->tsk
);
7505 EXPORT_SYMBOL(md_unregister_thread
);
7507 void md_error(struct mddev
*mddev
, struct md_rdev
*rdev
)
7509 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
7512 if (!mddev
->pers
|| !mddev
->pers
->error_handler
)
7514 mddev
->pers
->error_handler(mddev
,rdev
);
7515 if (mddev
->degraded
)
7516 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7517 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
7518 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7519 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7520 md_wakeup_thread(mddev
->thread
);
7521 if (mddev
->event_work
.func
)
7522 queue_work(md_misc_wq
, &mddev
->event_work
);
7523 md_new_event(mddev
);
7525 EXPORT_SYMBOL(md_error
);
7527 /* seq_file implementation /proc/mdstat */
7529 static void status_unused(struct seq_file
*seq
)
7532 struct md_rdev
*rdev
;
7534 seq_printf(seq
, "unused devices: ");
7536 list_for_each_entry(rdev
, &pending_raid_disks
, same_set
) {
7537 char b
[BDEVNAME_SIZE
];
7539 seq_printf(seq
, "%s ",
7540 bdevname(rdev
->bdev
,b
));
7543 seq_printf(seq
, "<none>");
7545 seq_printf(seq
, "\n");
7548 static int status_resync(struct seq_file
*seq
, struct mddev
*mddev
)
7550 sector_t max_sectors
, resync
, res
;
7551 unsigned long dt
, db
;
7554 unsigned int per_milli
;
7556 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
7557 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
7558 max_sectors
= mddev
->resync_max_sectors
;
7560 max_sectors
= mddev
->dev_sectors
;
7562 resync
= mddev
->curr_resync
;
7564 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
7565 /* Still cleaning up */
7566 resync
= max_sectors
;
7568 resync
-= atomic_read(&mddev
->recovery_active
);
7571 if (mddev
->recovery_cp
< MaxSector
) {
7572 seq_printf(seq
, "\tresync=PENDING");
7578 seq_printf(seq
, "\tresync=DELAYED");
7582 WARN_ON(max_sectors
== 0);
7583 /* Pick 'scale' such that (resync>>scale)*1000 will fit
7584 * in a sector_t, and (max_sectors>>scale) will fit in a
7585 * u32, as those are the requirements for sector_div.
7586 * Thus 'scale' must be at least 10
7589 if (sizeof(sector_t
) > sizeof(unsigned long)) {
7590 while ( max_sectors
/2 > (1ULL<<(scale
+32)))
7593 res
= (resync
>>scale
)*1000;
7594 sector_div(res
, (u32
)((max_sectors
>>scale
)+1));
7598 int i
, x
= per_milli
/50, y
= 20-x
;
7599 seq_printf(seq
, "[");
7600 for (i
= 0; i
< x
; i
++)
7601 seq_printf(seq
, "=");
7602 seq_printf(seq
, ">");
7603 for (i
= 0; i
< y
; i
++)
7604 seq_printf(seq
, ".");
7605 seq_printf(seq
, "] ");
7607 seq_printf(seq
, " %s =%3u.%u%% (%llu/%llu)",
7608 (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)?
7610 (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)?
7612 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
7613 "resync" : "recovery"))),
7614 per_milli
/10, per_milli
% 10,
7615 (unsigned long long) resync
/2,
7616 (unsigned long long) max_sectors
/2);
7619 * dt: time from mark until now
7620 * db: blocks written from mark until now
7621 * rt: remaining time
7623 * rt is a sector_t, so could be 32bit or 64bit.
7624 * So we divide before multiply in case it is 32bit and close
7626 * We scale the divisor (db) by 32 to avoid losing precision
7627 * near the end of resync when the number of remaining sectors
7629 * We then divide rt by 32 after multiplying by db to compensate.
7630 * The '+1' avoids division by zero if db is very small.
7632 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
7634 db
= (mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
))
7635 - mddev
->resync_mark_cnt
;
7637 rt
= max_sectors
- resync
; /* number of remaining sectors */
7638 sector_div(rt
, db
/32+1);
7642 seq_printf(seq
, " finish=%lu.%lumin", (unsigned long)rt
/ 60,
7643 ((unsigned long)rt
% 60)/6);
7645 seq_printf(seq
, " speed=%ldK/sec", db
/2/dt
);
7649 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
7651 struct list_head
*tmp
;
7653 struct mddev
*mddev
;
7661 spin_lock(&all_mddevs_lock
);
7662 list_for_each(tmp
,&all_mddevs
)
7664 mddev
= list_entry(tmp
, struct mddev
, all_mddevs
);
7666 spin_unlock(&all_mddevs_lock
);
7669 spin_unlock(&all_mddevs_lock
);
7671 return (void*)2;/* tail */
7675 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
7677 struct list_head
*tmp
;
7678 struct mddev
*next_mddev
, *mddev
= v
;
7684 spin_lock(&all_mddevs_lock
);
7686 tmp
= all_mddevs
.next
;
7688 tmp
= mddev
->all_mddevs
.next
;
7689 if (tmp
!= &all_mddevs
)
7690 next_mddev
= mddev_get(list_entry(tmp
,struct mddev
,all_mddevs
));
7692 next_mddev
= (void*)2;
7695 spin_unlock(&all_mddevs_lock
);
7703 static void md_seq_stop(struct seq_file
*seq
, void *v
)
7705 struct mddev
*mddev
= v
;
7707 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
7711 static int md_seq_show(struct seq_file
*seq
, void *v
)
7713 struct mddev
*mddev
= v
;
7715 struct md_rdev
*rdev
;
7717 if (v
== (void*)1) {
7718 struct md_personality
*pers
;
7719 seq_printf(seq
, "Personalities : ");
7720 spin_lock(&pers_lock
);
7721 list_for_each_entry(pers
, &pers_list
, list
)
7722 seq_printf(seq
, "[%s] ", pers
->name
);
7724 spin_unlock(&pers_lock
);
7725 seq_printf(seq
, "\n");
7726 seq
->poll_event
= atomic_read(&md_event_count
);
7729 if (v
== (void*)2) {
7734 spin_lock(&mddev
->lock
);
7735 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
7736 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
7737 mddev
->pers
? "" : "in");
7740 seq_printf(seq
, " (read-only)");
7742 seq_printf(seq
, " (auto-read-only)");
7743 seq_printf(seq
, " %s", mddev
->pers
->name
);
7748 rdev_for_each_rcu(rdev
, mddev
) {
7749 char b
[BDEVNAME_SIZE
];
7750 seq_printf(seq
, " %s[%d]",
7751 bdevname(rdev
->bdev
,b
), rdev
->desc_nr
);
7752 if (test_bit(WriteMostly
, &rdev
->flags
))
7753 seq_printf(seq
, "(W)");
7754 if (test_bit(Journal
, &rdev
->flags
))
7755 seq_printf(seq
, "(J)");
7756 if (test_bit(Faulty
, &rdev
->flags
)) {
7757 seq_printf(seq
, "(F)");
7760 if (rdev
->raid_disk
< 0)
7761 seq_printf(seq
, "(S)"); /* spare */
7762 if (test_bit(Replacement
, &rdev
->flags
))
7763 seq_printf(seq
, "(R)");
7764 sectors
+= rdev
->sectors
;
7768 if (!list_empty(&mddev
->disks
)) {
7770 seq_printf(seq
, "\n %llu blocks",
7771 (unsigned long long)
7772 mddev
->array_sectors
/ 2);
7774 seq_printf(seq
, "\n %llu blocks",
7775 (unsigned long long)sectors
/ 2);
7777 if (mddev
->persistent
) {
7778 if (mddev
->major_version
!= 0 ||
7779 mddev
->minor_version
!= 90) {
7780 seq_printf(seq
," super %d.%d",
7781 mddev
->major_version
,
7782 mddev
->minor_version
);
7784 } else if (mddev
->external
)
7785 seq_printf(seq
, " super external:%s",
7786 mddev
->metadata_type
);
7788 seq_printf(seq
, " super non-persistent");
7791 mddev
->pers
->status(seq
, mddev
);
7792 seq_printf(seq
, "\n ");
7793 if (mddev
->pers
->sync_request
) {
7794 if (status_resync(seq
, mddev
))
7795 seq_printf(seq
, "\n ");
7798 seq_printf(seq
, "\n ");
7800 bitmap_status(seq
, mddev
->bitmap
);
7802 seq_printf(seq
, "\n");
7804 spin_unlock(&mddev
->lock
);
7809 static const struct seq_operations md_seq_ops
= {
7810 .start
= md_seq_start
,
7811 .next
= md_seq_next
,
7812 .stop
= md_seq_stop
,
7813 .show
= md_seq_show
,
7816 static int md_seq_open(struct inode
*inode
, struct file
*file
)
7818 struct seq_file
*seq
;
7821 error
= seq_open(file
, &md_seq_ops
);
7825 seq
= file
->private_data
;
7826 seq
->poll_event
= atomic_read(&md_event_count
);
7830 static int md_unloading
;
7831 static unsigned int mdstat_poll(struct file
*filp
, poll_table
*wait
)
7833 struct seq_file
*seq
= filp
->private_data
;
7837 return POLLIN
|POLLRDNORM
|POLLERR
|POLLPRI
;
7838 poll_wait(filp
, &md_event_waiters
, wait
);
7840 /* always allow read */
7841 mask
= POLLIN
| POLLRDNORM
;
7843 if (seq
->poll_event
!= atomic_read(&md_event_count
))
7844 mask
|= POLLERR
| POLLPRI
;
7848 static const struct file_operations md_seq_fops
= {
7849 .owner
= THIS_MODULE
,
7850 .open
= md_seq_open
,
7852 .llseek
= seq_lseek
,
7853 .release
= seq_release
,
7854 .poll
= mdstat_poll
,
7857 int register_md_personality(struct md_personality
*p
)
7859 pr_debug("md: %s personality registered for level %d\n",
7861 spin_lock(&pers_lock
);
7862 list_add_tail(&p
->list
, &pers_list
);
7863 spin_unlock(&pers_lock
);
7866 EXPORT_SYMBOL(register_md_personality
);
7868 int unregister_md_personality(struct md_personality
*p
)
7870 pr_debug("md: %s personality unregistered\n", p
->name
);
7871 spin_lock(&pers_lock
);
7872 list_del_init(&p
->list
);
7873 spin_unlock(&pers_lock
);
7876 EXPORT_SYMBOL(unregister_md_personality
);
7878 int register_md_cluster_operations(struct md_cluster_operations
*ops
,
7879 struct module
*module
)
7882 spin_lock(&pers_lock
);
7883 if (md_cluster_ops
!= NULL
)
7886 md_cluster_ops
= ops
;
7887 md_cluster_mod
= module
;
7889 spin_unlock(&pers_lock
);
7892 EXPORT_SYMBOL(register_md_cluster_operations
);
7894 int unregister_md_cluster_operations(void)
7896 spin_lock(&pers_lock
);
7897 md_cluster_ops
= NULL
;
7898 spin_unlock(&pers_lock
);
7901 EXPORT_SYMBOL(unregister_md_cluster_operations
);
7903 int md_setup_cluster(struct mddev
*mddev
, int nodes
)
7905 if (!md_cluster_ops
)
7906 request_module("md-cluster");
7907 spin_lock(&pers_lock
);
7908 /* ensure module won't be unloaded */
7909 if (!md_cluster_ops
|| !try_module_get(md_cluster_mod
)) {
7910 pr_warn("can't find md-cluster module or get it's reference.\n");
7911 spin_unlock(&pers_lock
);
7914 spin_unlock(&pers_lock
);
7916 return md_cluster_ops
->join(mddev
, nodes
);
7919 void md_cluster_stop(struct mddev
*mddev
)
7921 if (!md_cluster_ops
)
7923 md_cluster_ops
->leave(mddev
);
7924 module_put(md_cluster_mod
);
7927 static int is_mddev_idle(struct mddev
*mddev
, int init
)
7929 struct md_rdev
*rdev
;
7935 rdev_for_each_rcu(rdev
, mddev
) {
7936 struct gendisk
*disk
= rdev
->bdev
->bd_contains
->bd_disk
;
7937 curr_events
= (int)part_stat_read(&disk
->part0
, sectors
[0]) +
7938 (int)part_stat_read(&disk
->part0
, sectors
[1]) -
7939 atomic_read(&disk
->sync_io
);
7940 /* sync IO will cause sync_io to increase before the disk_stats
7941 * as sync_io is counted when a request starts, and
7942 * disk_stats is counted when it completes.
7943 * So resync activity will cause curr_events to be smaller than
7944 * when there was no such activity.
7945 * non-sync IO will cause disk_stat to increase without
7946 * increasing sync_io so curr_events will (eventually)
7947 * be larger than it was before. Once it becomes
7948 * substantially larger, the test below will cause
7949 * the array to appear non-idle, and resync will slow
7951 * If there is a lot of outstanding resync activity when
7952 * we set last_event to curr_events, then all that activity
7953 * completing might cause the array to appear non-idle
7954 * and resync will be slowed down even though there might
7955 * not have been non-resync activity. This will only
7956 * happen once though. 'last_events' will soon reflect
7957 * the state where there is little or no outstanding
7958 * resync requests, and further resync activity will
7959 * always make curr_events less than last_events.
7962 if (init
|| curr_events
- rdev
->last_events
> 64) {
7963 rdev
->last_events
= curr_events
;
7971 void md_done_sync(struct mddev
*mddev
, int blocks
, int ok
)
7973 /* another "blocks" (512byte) blocks have been synced */
7974 atomic_sub(blocks
, &mddev
->recovery_active
);
7975 wake_up(&mddev
->recovery_wait
);
7977 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7978 set_bit(MD_RECOVERY_ERROR
, &mddev
->recovery
);
7979 md_wakeup_thread(mddev
->thread
);
7980 // stop recovery, signal do_sync ....
7983 EXPORT_SYMBOL(md_done_sync
);
7985 /* md_write_start(mddev, bi)
7986 * If we need to update some array metadata (e.g. 'active' flag
7987 * in superblock) before writing, schedule a superblock update
7988 * and wait for it to complete.
7989 * A return value of 'false' means that the write wasn't recorded
7990 * and cannot proceed as the array is being suspend.
7992 bool md_write_start(struct mddev
*mddev
, struct bio
*bi
)
7995 if (bio_data_dir(bi
) != WRITE
)
7998 BUG_ON(mddev
->ro
== 1);
7999 if (mddev
->ro
== 2) {
8000 /* need to switch to read/write */
8002 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
8003 md_wakeup_thread(mddev
->thread
);
8004 md_wakeup_thread(mddev
->sync_thread
);
8008 percpu_ref_get(&mddev
->writes_pending
);
8009 smp_mb(); /* Match smp_mb in set_in_sync() */
8010 if (mddev
->safemode
== 1)
8011 mddev
->safemode
= 0;
8012 /* sync_checkers is always 0 when writes_pending is in per-cpu mode */
8013 if (mddev
->in_sync
|| mddev
->sync_checkers
) {
8014 spin_lock(&mddev
->lock
);
8015 if (mddev
->in_sync
) {
8017 set_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
8018 set_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
8019 md_wakeup_thread(mddev
->thread
);
8022 spin_unlock(&mddev
->lock
);
8026 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
8027 wait_event(mddev
->sb_wait
,
8028 !test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
) && !mddev
->suspended
);
8029 if (test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
)) {
8030 percpu_ref_put(&mddev
->writes_pending
);
8035 EXPORT_SYMBOL(md_write_start
);
8037 /* md_write_inc can only be called when md_write_start() has
8038 * already been called at least once of the current request.
8039 * It increments the counter and is useful when a single request
8040 * is split into several parts. Each part causes an increment and
8041 * so needs a matching md_write_end().
8042 * Unlike md_write_start(), it is safe to call md_write_inc() inside
8043 * a spinlocked region.
8045 void md_write_inc(struct mddev
*mddev
, struct bio
*bi
)
8047 if (bio_data_dir(bi
) != WRITE
)
8049 WARN_ON_ONCE(mddev
->in_sync
|| mddev
->ro
);
8050 percpu_ref_get(&mddev
->writes_pending
);
8052 EXPORT_SYMBOL(md_write_inc
);
8054 void md_write_end(struct mddev
*mddev
)
8056 percpu_ref_put(&mddev
->writes_pending
);
8058 if (mddev
->safemode
== 2)
8059 md_wakeup_thread(mddev
->thread
);
8060 else if (mddev
->safemode_delay
)
8061 /* The roundup() ensures this only performs locking once
8062 * every ->safemode_delay jiffies
8064 mod_timer(&mddev
->safemode_timer
,
8065 roundup(jiffies
, mddev
->safemode_delay
) +
8066 mddev
->safemode_delay
);
8069 EXPORT_SYMBOL(md_write_end
);
8071 /* md_allow_write(mddev)
8072 * Calling this ensures that the array is marked 'active' so that writes
8073 * may proceed without blocking. It is important to call this before
8074 * attempting a GFP_KERNEL allocation while holding the mddev lock.
8075 * Must be called with mddev_lock held.
8077 void md_allow_write(struct mddev
*mddev
)
8083 if (!mddev
->pers
->sync_request
)
8086 spin_lock(&mddev
->lock
);
8087 if (mddev
->in_sync
) {
8089 set_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
8090 set_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
8091 if (mddev
->safemode_delay
&&
8092 mddev
->safemode
== 0)
8093 mddev
->safemode
= 1;
8094 spin_unlock(&mddev
->lock
);
8095 md_update_sb(mddev
, 0);
8096 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
8097 /* wait for the dirty state to be recorded in the metadata */
8098 wait_event(mddev
->sb_wait
,
8099 !test_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
) &&
8100 !test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
));
8102 spin_unlock(&mddev
->lock
);
8104 EXPORT_SYMBOL_GPL(md_allow_write
);
8106 #define SYNC_MARKS 10
8107 #define SYNC_MARK_STEP (3*HZ)
8108 #define UPDATE_FREQUENCY (5*60*HZ)
8109 void md_do_sync(struct md_thread
*thread
)
8111 struct mddev
*mddev
= thread
->mddev
;
8112 struct mddev
*mddev2
;
8113 unsigned int currspeed
= 0,
8115 sector_t max_sectors
,j
, io_sectors
, recovery_done
;
8116 unsigned long mark
[SYNC_MARKS
];
8117 unsigned long update_time
;
8118 sector_t mark_cnt
[SYNC_MARKS
];
8120 struct list_head
*tmp
;
8121 sector_t last_check
;
8123 struct md_rdev
*rdev
;
8124 char *desc
, *action
= NULL
;
8125 struct blk_plug plug
;
8128 /* just incase thread restarts... */
8129 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
8131 if (mddev
->ro
) {/* never try to sync a read-only array */
8132 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8136 if (mddev_is_clustered(mddev
)) {
8137 ret
= md_cluster_ops
->resync_start(mddev
);
8141 set_bit(MD_CLUSTER_RESYNC_LOCKED
, &mddev
->flags
);
8142 if (!(test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
8143 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) ||
8144 test_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
))
8145 && ((unsigned long long)mddev
->curr_resync_completed
8146 < (unsigned long long)mddev
->resync_max_sectors
))
8150 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
8151 if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)) {
8152 desc
= "data-check";
8154 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
8155 desc
= "requested-resync";
8159 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
8164 mddev
->last_sync_action
= action
?: desc
;
8166 /* we overload curr_resync somewhat here.
8167 * 0 == not engaged in resync at all
8168 * 2 == checking that there is no conflict with another sync
8169 * 1 == like 2, but have yielded to allow conflicting resync to
8171 * other == active in resync - this many blocks
8173 * Before starting a resync we must have set curr_resync to
8174 * 2, and then checked that every "conflicting" array has curr_resync
8175 * less than ours. When we find one that is the same or higher
8176 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
8177 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
8178 * This will mean we have to start checking from the beginning again.
8183 int mddev2_minor
= -1;
8184 mddev
->curr_resync
= 2;
8187 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
8189 for_each_mddev(mddev2
, tmp
) {
8190 if (mddev2
== mddev
)
8192 if (!mddev
->parallel_resync
8193 && mddev2
->curr_resync
8194 && match_mddev_units(mddev
, mddev2
)) {
8196 if (mddev
< mddev2
&& mddev
->curr_resync
== 2) {
8197 /* arbitrarily yield */
8198 mddev
->curr_resync
= 1;
8199 wake_up(&resync_wait
);
8201 if (mddev
> mddev2
&& mddev
->curr_resync
== 1)
8202 /* no need to wait here, we can wait the next
8203 * time 'round when curr_resync == 2
8206 /* We need to wait 'interruptible' so as not to
8207 * contribute to the load average, and not to
8208 * be caught by 'softlockup'
8210 prepare_to_wait(&resync_wait
, &wq
, TASK_INTERRUPTIBLE
);
8211 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
8212 mddev2
->curr_resync
>= mddev
->curr_resync
) {
8213 if (mddev2_minor
!= mddev2
->md_minor
) {
8214 mddev2_minor
= mddev2
->md_minor
;
8215 pr_info("md: delaying %s of %s until %s has finished (they share one or more physical units)\n",
8216 desc
, mdname(mddev
),
8220 if (signal_pending(current
))
8221 flush_signals(current
);
8223 finish_wait(&resync_wait
, &wq
);
8226 finish_wait(&resync_wait
, &wq
);
8229 } while (mddev
->curr_resync
< 2);
8232 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
8233 /* resync follows the size requested by the personality,
8234 * which defaults to physical size, but can be virtual size
8236 max_sectors
= mddev
->resync_max_sectors
;
8237 atomic64_set(&mddev
->resync_mismatches
, 0);
8238 /* we don't use the checkpoint if there's a bitmap */
8239 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
8240 j
= mddev
->resync_min
;
8241 else if (!mddev
->bitmap
)
8242 j
= mddev
->recovery_cp
;
8244 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
8245 max_sectors
= mddev
->resync_max_sectors
;
8247 /* recovery follows the physical size of devices */
8248 max_sectors
= mddev
->dev_sectors
;
8251 rdev_for_each_rcu(rdev
, mddev
)
8252 if (rdev
->raid_disk
>= 0 &&
8253 !test_bit(Journal
, &rdev
->flags
) &&
8254 !test_bit(Faulty
, &rdev
->flags
) &&
8255 !test_bit(In_sync
, &rdev
->flags
) &&
8256 rdev
->recovery_offset
< j
)
8257 j
= rdev
->recovery_offset
;
8260 /* If there is a bitmap, we need to make sure all
8261 * writes that started before we added a spare
8262 * complete before we start doing a recovery.
8263 * Otherwise the write might complete and (via
8264 * bitmap_endwrite) set a bit in the bitmap after the
8265 * recovery has checked that bit and skipped that
8268 if (mddev
->bitmap
) {
8269 mddev
->pers
->quiesce(mddev
, 1);
8270 mddev
->pers
->quiesce(mddev
, 0);
8274 pr_info("md: %s of RAID array %s\n", desc
, mdname(mddev
));
8275 pr_debug("md: minimum _guaranteed_ speed: %d KB/sec/disk.\n", speed_min(mddev
));
8276 pr_debug("md: using maximum available idle IO bandwidth (but not more than %d KB/sec) for %s.\n",
8277 speed_max(mddev
), desc
);
8279 is_mddev_idle(mddev
, 1); /* this initializes IO event counters */
8282 for (m
= 0; m
< SYNC_MARKS
; m
++) {
8284 mark_cnt
[m
] = io_sectors
;
8287 mddev
->resync_mark
= mark
[last_mark
];
8288 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
8291 * Tune reconstruction:
8293 window
= 32*(PAGE_SIZE
/512);
8294 pr_debug("md: using %dk window, over a total of %lluk.\n",
8295 window
/2, (unsigned long long)max_sectors
/2);
8297 atomic_set(&mddev
->recovery_active
, 0);
8301 pr_debug("md: resuming %s of %s from checkpoint.\n",
8302 desc
, mdname(mddev
));
8303 mddev
->curr_resync
= j
;
8305 mddev
->curr_resync
= 3; /* no longer delayed */
8306 mddev
->curr_resync_completed
= j
;
8307 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
8308 md_new_event(mddev
);
8309 update_time
= jiffies
;
8311 blk_start_plug(&plug
);
8312 while (j
< max_sectors
) {
8317 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
8318 ((mddev
->curr_resync
> mddev
->curr_resync_completed
&&
8319 (mddev
->curr_resync
- mddev
->curr_resync_completed
)
8320 > (max_sectors
>> 4)) ||
8321 time_after_eq(jiffies
, update_time
+ UPDATE_FREQUENCY
) ||
8322 (j
- mddev
->curr_resync_completed
)*2
8323 >= mddev
->resync_max
- mddev
->curr_resync_completed
||
8324 mddev
->curr_resync_completed
> mddev
->resync_max
8326 /* time to update curr_resync_completed */
8327 wait_event(mddev
->recovery_wait
,
8328 atomic_read(&mddev
->recovery_active
) == 0);
8329 mddev
->curr_resync_completed
= j
;
8330 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) &&
8331 j
> mddev
->recovery_cp
)
8332 mddev
->recovery_cp
= j
;
8333 update_time
= jiffies
;
8334 set_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
8335 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
8338 while (j
>= mddev
->resync_max
&&
8339 !test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
8340 /* As this condition is controlled by user-space,
8341 * we can block indefinitely, so use '_interruptible'
8342 * to avoid triggering warnings.
8344 flush_signals(current
); /* just in case */
8345 wait_event_interruptible(mddev
->recovery_wait
,
8346 mddev
->resync_max
> j
8347 || test_bit(MD_RECOVERY_INTR
,
8351 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
8354 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
);
8356 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8360 if (!skipped
) { /* actual IO requested */
8361 io_sectors
+= sectors
;
8362 atomic_add(sectors
, &mddev
->recovery_active
);
8365 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
8369 if (j
> max_sectors
)
8370 /* when skipping, extra large numbers can be returned. */
8373 mddev
->curr_resync
= j
;
8374 mddev
->curr_mark_cnt
= io_sectors
;
8375 if (last_check
== 0)
8376 /* this is the earliest that rebuild will be
8377 * visible in /proc/mdstat
8379 md_new_event(mddev
);
8381 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
8384 last_check
= io_sectors
;
8386 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
8388 int next
= (last_mark
+1) % SYNC_MARKS
;
8390 mddev
->resync_mark
= mark
[next
];
8391 mddev
->resync_mark_cnt
= mark_cnt
[next
];
8392 mark
[next
] = jiffies
;
8393 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
8397 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
8401 * this loop exits only if either when we are slower than
8402 * the 'hard' speed limit, or the system was IO-idle for
8404 * the system might be non-idle CPU-wise, but we only care
8405 * about not overloading the IO subsystem. (things like an
8406 * e2fsck being done on the RAID array should execute fast)
8410 recovery_done
= io_sectors
- atomic_read(&mddev
->recovery_active
);
8411 currspeed
= ((unsigned long)(recovery_done
- mddev
->resync_mark_cnt
))/2
8412 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
8414 if (currspeed
> speed_min(mddev
)) {
8415 if (currspeed
> speed_max(mddev
)) {
8419 if (!is_mddev_idle(mddev
, 0)) {
8421 * Give other IO more of a chance.
8422 * The faster the devices, the less we wait.
8424 wait_event(mddev
->recovery_wait
,
8425 !atomic_read(&mddev
->recovery_active
));
8429 pr_info("md: %s: %s %s.\n",mdname(mddev
), desc
,
8430 test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)
8431 ? "interrupted" : "done");
8433 * this also signals 'finished resyncing' to md_stop
8435 blk_finish_plug(&plug
);
8436 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
8438 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
8439 !test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
8440 mddev
->curr_resync
> 3) {
8441 mddev
->curr_resync_completed
= mddev
->curr_resync
;
8442 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
8444 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
);
8446 if (!test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
) &&
8447 mddev
->curr_resync
> 3) {
8448 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
8449 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
8450 if (mddev
->curr_resync
>= mddev
->recovery_cp
) {
8451 pr_debug("md: checkpointing %s of %s.\n",
8452 desc
, mdname(mddev
));
8453 if (test_bit(MD_RECOVERY_ERROR
,
8455 mddev
->recovery_cp
=
8456 mddev
->curr_resync_completed
;
8458 mddev
->recovery_cp
=
8462 mddev
->recovery_cp
= MaxSector
;
8464 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
8465 mddev
->curr_resync
= MaxSector
;
8467 rdev_for_each_rcu(rdev
, mddev
)
8468 if (rdev
->raid_disk
>= 0 &&
8469 mddev
->delta_disks
>= 0 &&
8470 !test_bit(Journal
, &rdev
->flags
) &&
8471 !test_bit(Faulty
, &rdev
->flags
) &&
8472 !test_bit(In_sync
, &rdev
->flags
) &&
8473 rdev
->recovery_offset
< mddev
->curr_resync
)
8474 rdev
->recovery_offset
= mddev
->curr_resync
;
8479 /* set CHANGE_PENDING here since maybe another update is needed,
8480 * so other nodes are informed. It should be harmless for normal
8482 set_mask_bits(&mddev
->sb_flags
, 0,
8483 BIT(MD_SB_CHANGE_PENDING
) | BIT(MD_SB_CHANGE_DEVS
));
8485 spin_lock(&mddev
->lock
);
8486 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
8487 /* We completed so min/max setting can be forgotten if used. */
8488 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
8489 mddev
->resync_min
= 0;
8490 mddev
->resync_max
= MaxSector
;
8491 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
8492 mddev
->resync_min
= mddev
->curr_resync_completed
;
8493 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
8494 mddev
->curr_resync
= 0;
8495 spin_unlock(&mddev
->lock
);
8497 wake_up(&resync_wait
);
8498 md_wakeup_thread(mddev
->thread
);
8501 EXPORT_SYMBOL_GPL(md_do_sync
);
8503 static int remove_and_add_spares(struct mddev
*mddev
,
8504 struct md_rdev
*this)
8506 struct md_rdev
*rdev
;
8509 bool remove_some
= false;
8511 rdev_for_each(rdev
, mddev
) {
8512 if ((this == NULL
|| rdev
== this) &&
8513 rdev
->raid_disk
>= 0 &&
8514 !test_bit(Blocked
, &rdev
->flags
) &&
8515 test_bit(Faulty
, &rdev
->flags
) &&
8516 atomic_read(&rdev
->nr_pending
)==0) {
8517 /* Faulty non-Blocked devices with nr_pending == 0
8518 * never get nr_pending incremented,
8519 * never get Faulty cleared, and never get Blocked set.
8520 * So we can synchronize_rcu now rather than once per device
8523 set_bit(RemoveSynchronized
, &rdev
->flags
);
8529 rdev_for_each(rdev
, mddev
) {
8530 if ((this == NULL
|| rdev
== this) &&
8531 rdev
->raid_disk
>= 0 &&
8532 !test_bit(Blocked
, &rdev
->flags
) &&
8533 ((test_bit(RemoveSynchronized
, &rdev
->flags
) ||
8534 (!test_bit(In_sync
, &rdev
->flags
) &&
8535 !test_bit(Journal
, &rdev
->flags
))) &&
8536 atomic_read(&rdev
->nr_pending
)==0)) {
8537 if (mddev
->pers
->hot_remove_disk(
8538 mddev
, rdev
) == 0) {
8539 sysfs_unlink_rdev(mddev
, rdev
);
8540 rdev
->raid_disk
= -1;
8544 if (remove_some
&& test_bit(RemoveSynchronized
, &rdev
->flags
))
8545 clear_bit(RemoveSynchronized
, &rdev
->flags
);
8548 if (removed
&& mddev
->kobj
.sd
)
8549 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
8551 if (this && removed
)
8554 rdev_for_each(rdev
, mddev
) {
8555 if (this && this != rdev
)
8557 if (test_bit(Candidate
, &rdev
->flags
))
8559 if (rdev
->raid_disk
>= 0 &&
8560 !test_bit(In_sync
, &rdev
->flags
) &&
8561 !test_bit(Journal
, &rdev
->flags
) &&
8562 !test_bit(Faulty
, &rdev
->flags
))
8564 if (rdev
->raid_disk
>= 0)
8566 if (test_bit(Faulty
, &rdev
->flags
))
8568 if (!test_bit(Journal
, &rdev
->flags
)) {
8570 ! (rdev
->saved_raid_disk
>= 0 &&
8571 !test_bit(Bitmap_sync
, &rdev
->flags
)))
8574 rdev
->recovery_offset
= 0;
8577 hot_add_disk(mddev
, rdev
) == 0) {
8578 if (sysfs_link_rdev(mddev
, rdev
))
8579 /* failure here is OK */;
8580 if (!test_bit(Journal
, &rdev
->flags
))
8582 md_new_event(mddev
);
8583 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
8588 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
8592 static void md_start_sync(struct work_struct
*ws
)
8594 struct mddev
*mddev
= container_of(ws
, struct mddev
, del_work
);
8596 mddev
->sync_thread
= md_register_thread(md_do_sync
,
8599 if (!mddev
->sync_thread
) {
8600 pr_warn("%s: could not start resync thread...\n",
8602 /* leave the spares where they are, it shouldn't hurt */
8603 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8604 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
8605 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
8606 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
8607 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8608 wake_up(&resync_wait
);
8609 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
8611 if (mddev
->sysfs_action
)
8612 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
8614 md_wakeup_thread(mddev
->sync_thread
);
8615 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
8616 md_new_event(mddev
);
8620 * This routine is regularly called by all per-raid-array threads to
8621 * deal with generic issues like resync and super-block update.
8622 * Raid personalities that don't have a thread (linear/raid0) do not
8623 * need this as they never do any recovery or update the superblock.
8625 * It does not do any resync itself, but rather "forks" off other threads
8626 * to do that as needed.
8627 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
8628 * "->recovery" and create a thread at ->sync_thread.
8629 * When the thread finishes it sets MD_RECOVERY_DONE
8630 * and wakeups up this thread which will reap the thread and finish up.
8631 * This thread also removes any faulty devices (with nr_pending == 0).
8633 * The overall approach is:
8634 * 1/ if the superblock needs updating, update it.
8635 * 2/ If a recovery thread is running, don't do anything else.
8636 * 3/ If recovery has finished, clean up, possibly marking spares active.
8637 * 4/ If there are any faulty devices, remove them.
8638 * 5/ If array is degraded, try to add spares devices
8639 * 6/ If array has spares or is not in-sync, start a resync thread.
8641 void md_check_recovery(struct mddev
*mddev
)
8643 if (mddev
->suspended
)
8647 bitmap_daemon_work(mddev
);
8649 if (signal_pending(current
)) {
8650 if (mddev
->pers
->sync_request
&& !mddev
->external
) {
8651 pr_debug("md: %s in immediate safe mode\n",
8653 mddev
->safemode
= 2;
8655 flush_signals(current
);
8658 if (mddev
->ro
&& !test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
8661 (mddev
->sb_flags
& ~ (1<<MD_SB_CHANGE_PENDING
)) ||
8662 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
8663 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
8664 (mddev
->external
== 0 && mddev
->safemode
== 1) ||
8665 (mddev
->safemode
== 2
8666 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
8670 if (mddev_trylock(mddev
)) {
8673 if (!mddev
->external
&& mddev
->safemode
== 1)
8674 mddev
->safemode
= 0;
8677 struct md_rdev
*rdev
;
8678 if (!mddev
->external
&& mddev
->in_sync
)
8679 /* 'Blocked' flag not needed as failed devices
8680 * will be recorded if array switched to read/write.
8681 * Leaving it set will prevent the device
8682 * from being removed.
8684 rdev_for_each(rdev
, mddev
)
8685 clear_bit(Blocked
, &rdev
->flags
);
8686 /* On a read-only array we can:
8687 * - remove failed devices
8688 * - add already-in_sync devices if the array itself
8690 * As we only add devices that are already in-sync,
8691 * we can activate the spares immediately.
8693 remove_and_add_spares(mddev
, NULL
);
8694 /* There is no thread, but we need to call
8695 * ->spare_active and clear saved_raid_disk
8697 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8698 md_reap_sync_thread(mddev
);
8699 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8700 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
8701 clear_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
8705 if (mddev_is_clustered(mddev
)) {
8706 struct md_rdev
*rdev
;
8707 /* kick the device if another node issued a
8710 rdev_for_each(rdev
, mddev
) {
8711 if (test_and_clear_bit(ClusterRemove
, &rdev
->flags
) &&
8712 rdev
->raid_disk
< 0)
8713 md_kick_rdev_from_array(rdev
);
8717 if (!mddev
->external
&& !mddev
->in_sync
) {
8718 spin_lock(&mddev
->lock
);
8720 spin_unlock(&mddev
->lock
);
8723 if (mddev
->sb_flags
)
8724 md_update_sb(mddev
, 0);
8726 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
8727 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
8728 /* resync/recovery still happening */
8729 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
8732 if (mddev
->sync_thread
) {
8733 md_reap_sync_thread(mddev
);
8736 /* Set RUNNING before clearing NEEDED to avoid
8737 * any transients in the value of "sync_action".
8739 mddev
->curr_resync_completed
= 0;
8740 spin_lock(&mddev
->lock
);
8741 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8742 spin_unlock(&mddev
->lock
);
8743 /* Clear some bits that don't mean anything, but
8746 clear_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8747 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
8749 if (!test_and_clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
8750 test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
8752 /* no recovery is running.
8753 * remove any failed drives, then
8754 * add spares if possible.
8755 * Spares are also removed and re-added, to allow
8756 * the personality to fail the re-add.
8759 if (mddev
->reshape_position
!= MaxSector
) {
8760 if (mddev
->pers
->check_reshape
== NULL
||
8761 mddev
->pers
->check_reshape(mddev
) != 0)
8762 /* Cannot proceed */
8764 set_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
8765 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8766 } else if ((spares
= remove_and_add_spares(mddev
, NULL
))) {
8767 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8768 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
8769 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
8770 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8771 } else if (mddev
->recovery_cp
< MaxSector
) {
8772 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8773 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8774 } else if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
8775 /* nothing to be done ... */
8778 if (mddev
->pers
->sync_request
) {
8780 /* We are adding a device or devices to an array
8781 * which has the bitmap stored on all devices.
8782 * So make sure all bitmap pages get written
8784 bitmap_write_all(mddev
->bitmap
);
8786 INIT_WORK(&mddev
->del_work
, md_start_sync
);
8787 queue_work(md_misc_wq
, &mddev
->del_work
);
8791 if (!mddev
->sync_thread
) {
8792 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8793 wake_up(&resync_wait
);
8794 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
8796 if (mddev
->sysfs_action
)
8797 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
8800 wake_up(&mddev
->sb_wait
);
8801 mddev_unlock(mddev
);
8804 EXPORT_SYMBOL(md_check_recovery
);
8806 void md_reap_sync_thread(struct mddev
*mddev
)
8808 struct md_rdev
*rdev
;
8810 /* resync has finished, collect result */
8811 md_unregister_thread(&mddev
->sync_thread
);
8812 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
8813 !test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
8815 /* activate any spares */
8816 if (mddev
->pers
->spare_active(mddev
)) {
8817 sysfs_notify(&mddev
->kobj
, NULL
,
8819 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
8822 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
8823 mddev
->pers
->finish_reshape
)
8824 mddev
->pers
->finish_reshape(mddev
);
8826 /* If array is no-longer degraded, then any saved_raid_disk
8827 * information must be scrapped.
8829 if (!mddev
->degraded
)
8830 rdev_for_each(rdev
, mddev
)
8831 rdev
->saved_raid_disk
= -1;
8833 md_update_sb(mddev
, 1);
8834 /* MD_SB_CHANGE_PENDING should be cleared by md_update_sb, so we can
8835 * call resync_finish here if MD_CLUSTER_RESYNC_LOCKED is set by
8837 if (test_and_clear_bit(MD_CLUSTER_RESYNC_LOCKED
, &mddev
->flags
))
8838 md_cluster_ops
->resync_finish(mddev
);
8839 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8840 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
8841 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8842 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
8843 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
8844 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
8845 wake_up(&resync_wait
);
8846 /* flag recovery needed just to double check */
8847 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
8848 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
8849 md_new_event(mddev
);
8850 if (mddev
->event_work
.func
)
8851 queue_work(md_misc_wq
, &mddev
->event_work
);
8853 EXPORT_SYMBOL(md_reap_sync_thread
);
8855 void md_wait_for_blocked_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
8857 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
8858 wait_event_timeout(rdev
->blocked_wait
,
8859 !test_bit(Blocked
, &rdev
->flags
) &&
8860 !test_bit(BlockedBadBlocks
, &rdev
->flags
),
8861 msecs_to_jiffies(5000));
8862 rdev_dec_pending(rdev
, mddev
);
8864 EXPORT_SYMBOL(md_wait_for_blocked_rdev
);
8866 void md_finish_reshape(struct mddev
*mddev
)
8868 /* called be personality module when reshape completes. */
8869 struct md_rdev
*rdev
;
8871 rdev_for_each(rdev
, mddev
) {
8872 if (rdev
->data_offset
> rdev
->new_data_offset
)
8873 rdev
->sectors
+= rdev
->data_offset
- rdev
->new_data_offset
;
8875 rdev
->sectors
-= rdev
->new_data_offset
- rdev
->data_offset
;
8876 rdev
->data_offset
= rdev
->new_data_offset
;
8879 EXPORT_SYMBOL(md_finish_reshape
);
8881 /* Bad block management */
8883 /* Returns 1 on success, 0 on failure */
8884 int rdev_set_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
8887 struct mddev
*mddev
= rdev
->mddev
;
8890 s
+= rdev
->new_data_offset
;
8892 s
+= rdev
->data_offset
;
8893 rv
= badblocks_set(&rdev
->badblocks
, s
, sectors
, 0);
8895 /* Make sure they get written out promptly */
8896 if (test_bit(ExternalBbl
, &rdev
->flags
))
8897 sysfs_notify(&rdev
->kobj
, NULL
,
8898 "unacknowledged_bad_blocks");
8899 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
8900 set_mask_bits(&mddev
->sb_flags
, 0,
8901 BIT(MD_SB_CHANGE_CLEAN
) | BIT(MD_SB_CHANGE_PENDING
));
8902 md_wakeup_thread(rdev
->mddev
->thread
);
8907 EXPORT_SYMBOL_GPL(rdev_set_badblocks
);
8909 int rdev_clear_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
8914 s
+= rdev
->new_data_offset
;
8916 s
+= rdev
->data_offset
;
8917 rv
= badblocks_clear(&rdev
->badblocks
, s
, sectors
);
8918 if ((rv
== 0) && test_bit(ExternalBbl
, &rdev
->flags
))
8919 sysfs_notify(&rdev
->kobj
, NULL
, "bad_blocks");
8922 EXPORT_SYMBOL_GPL(rdev_clear_badblocks
);
8924 static int md_notify_reboot(struct notifier_block
*this,
8925 unsigned long code
, void *x
)
8927 struct list_head
*tmp
;
8928 struct mddev
*mddev
;
8931 for_each_mddev(mddev
, tmp
) {
8932 if (mddev_trylock(mddev
)) {
8934 __md_stop_writes(mddev
);
8935 if (mddev
->persistent
)
8936 mddev
->safemode
= 2;
8937 mddev_unlock(mddev
);
8942 * certain more exotic SCSI devices are known to be
8943 * volatile wrt too early system reboots. While the
8944 * right place to handle this issue is the given
8945 * driver, we do want to have a safe RAID driver ...
8953 static struct notifier_block md_notifier
= {
8954 .notifier_call
= md_notify_reboot
,
8956 .priority
= INT_MAX
, /* before any real devices */
8959 static void md_geninit(void)
8961 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
8963 proc_create("mdstat", S_IRUGO
, NULL
, &md_seq_fops
);
8966 static int __init
md_init(void)
8970 md_wq
= alloc_workqueue("md", WQ_MEM_RECLAIM
, 0);
8974 md_misc_wq
= alloc_workqueue("md_misc", 0, 0);
8978 if ((ret
= register_blkdev(MD_MAJOR
, "md")) < 0)
8981 if ((ret
= register_blkdev(0, "mdp")) < 0)
8985 blk_register_region(MKDEV(MD_MAJOR
, 0), 512, THIS_MODULE
,
8986 md_probe
, NULL
, NULL
);
8987 blk_register_region(MKDEV(mdp_major
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
8988 md_probe
, NULL
, NULL
);
8990 register_reboot_notifier(&md_notifier
);
8991 raid_table_header
= register_sysctl_table(raid_root_table
);
8997 unregister_blkdev(MD_MAJOR
, "md");
8999 destroy_workqueue(md_misc_wq
);
9001 destroy_workqueue(md_wq
);
9006 static void check_sb_changes(struct mddev
*mddev
, struct md_rdev
*rdev
)
9008 struct mdp_superblock_1
*sb
= page_address(rdev
->sb_page
);
9009 struct md_rdev
*rdev2
;
9011 char b
[BDEVNAME_SIZE
];
9014 * If size is changed in another node then we need to
9015 * do resize as well.
9017 if (mddev
->dev_sectors
!= le64_to_cpu(sb
->size
)) {
9018 ret
= mddev
->pers
->resize(mddev
, le64_to_cpu(sb
->size
));
9020 pr_info("md-cluster: resize failed\n");
9022 bitmap_update_sb(mddev
->bitmap
);
9025 /* Check for change of roles in the active devices */
9026 rdev_for_each(rdev2
, mddev
) {
9027 if (test_bit(Faulty
, &rdev2
->flags
))
9030 /* Check if the roles changed */
9031 role
= le16_to_cpu(sb
->dev_roles
[rdev2
->desc_nr
]);
9033 if (test_bit(Candidate
, &rdev2
->flags
)) {
9034 if (role
== 0xfffe) {
9035 pr_info("md: Removing Candidate device %s because add failed\n", bdevname(rdev2
->bdev
,b
));
9036 md_kick_rdev_from_array(rdev2
);
9040 clear_bit(Candidate
, &rdev2
->flags
);
9043 if (role
!= rdev2
->raid_disk
) {
9045 if (rdev2
->raid_disk
== -1 && role
!= 0xffff) {
9046 rdev2
->saved_raid_disk
= role
;
9047 ret
= remove_and_add_spares(mddev
, rdev2
);
9048 pr_info("Activated spare: %s\n",
9049 bdevname(rdev2
->bdev
,b
));
9050 /* wakeup mddev->thread here, so array could
9051 * perform resync with the new activated disk */
9052 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
9053 md_wakeup_thread(mddev
->thread
);
9057 * We just want to do the minimum to mark the disk
9058 * as faulty. The recovery is performed by the
9059 * one who initiated the error.
9061 if ((role
== 0xfffe) || (role
== 0xfffd)) {
9062 md_error(mddev
, rdev2
);
9063 clear_bit(Blocked
, &rdev2
->flags
);
9068 if (mddev
->raid_disks
!= le32_to_cpu(sb
->raid_disks
))
9069 update_raid_disks(mddev
, le32_to_cpu(sb
->raid_disks
));
9071 /* Finally set the event to be up to date */
9072 mddev
->events
= le64_to_cpu(sb
->events
);
9075 static int read_rdev(struct mddev
*mddev
, struct md_rdev
*rdev
)
9078 struct page
*swapout
= rdev
->sb_page
;
9079 struct mdp_superblock_1
*sb
;
9081 /* Store the sb page of the rdev in the swapout temporary
9082 * variable in case we err in the future
9084 rdev
->sb_page
= NULL
;
9085 err
= alloc_disk_sb(rdev
);
9087 ClearPageUptodate(rdev
->sb_page
);
9088 rdev
->sb_loaded
= 0;
9089 err
= super_types
[mddev
->major_version
].
9090 load_super(rdev
, NULL
, mddev
->minor_version
);
9093 pr_warn("%s: %d Could not reload rdev(%d) err: %d. Restoring old values\n",
9094 __func__
, __LINE__
, rdev
->desc_nr
, err
);
9096 put_page(rdev
->sb_page
);
9097 rdev
->sb_page
= swapout
;
9098 rdev
->sb_loaded
= 1;
9102 sb
= page_address(rdev
->sb_page
);
9103 /* Read the offset unconditionally, even if MD_FEATURE_RECOVERY_OFFSET
9107 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RECOVERY_OFFSET
))
9108 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
9110 /* The other node finished recovery, call spare_active to set
9111 * device In_sync and mddev->degraded
9113 if (rdev
->recovery_offset
== MaxSector
&&
9114 !test_bit(In_sync
, &rdev
->flags
) &&
9115 mddev
->pers
->spare_active(mddev
))
9116 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
9122 void md_reload_sb(struct mddev
*mddev
, int nr
)
9124 struct md_rdev
*rdev
;
9128 rdev_for_each_rcu(rdev
, mddev
) {
9129 if (rdev
->desc_nr
== nr
)
9133 if (!rdev
|| rdev
->desc_nr
!= nr
) {
9134 pr_warn("%s: %d Could not find rdev with nr %d\n", __func__
, __LINE__
, nr
);
9138 err
= read_rdev(mddev
, rdev
);
9142 check_sb_changes(mddev
, rdev
);
9144 /* Read all rdev's to update recovery_offset */
9145 rdev_for_each_rcu(rdev
, mddev
)
9146 read_rdev(mddev
, rdev
);
9148 EXPORT_SYMBOL(md_reload_sb
);
9153 * Searches all registered partitions for autorun RAID arrays
9157 static DEFINE_MUTEX(detected_devices_mutex
);
9158 static LIST_HEAD(all_detected_devices
);
9159 struct detected_devices_node
{
9160 struct list_head list
;
9164 void md_autodetect_dev(dev_t dev
)
9166 struct detected_devices_node
*node_detected_dev
;
9168 node_detected_dev
= kzalloc(sizeof(*node_detected_dev
), GFP_KERNEL
);
9169 if (node_detected_dev
) {
9170 node_detected_dev
->dev
= dev
;
9171 mutex_lock(&detected_devices_mutex
);
9172 list_add_tail(&node_detected_dev
->list
, &all_detected_devices
);
9173 mutex_unlock(&detected_devices_mutex
);
9177 static void autostart_arrays(int part
)
9179 struct md_rdev
*rdev
;
9180 struct detected_devices_node
*node_detected_dev
;
9182 int i_scanned
, i_passed
;
9187 pr_info("md: Autodetecting RAID arrays.\n");
9189 mutex_lock(&detected_devices_mutex
);
9190 while (!list_empty(&all_detected_devices
) && i_scanned
< INT_MAX
) {
9192 node_detected_dev
= list_entry(all_detected_devices
.next
,
9193 struct detected_devices_node
, list
);
9194 list_del(&node_detected_dev
->list
);
9195 dev
= node_detected_dev
->dev
;
9196 kfree(node_detected_dev
);
9197 mutex_unlock(&detected_devices_mutex
);
9198 rdev
= md_import_device(dev
,0, 90);
9199 mutex_lock(&detected_devices_mutex
);
9203 if (test_bit(Faulty
, &rdev
->flags
))
9206 set_bit(AutoDetected
, &rdev
->flags
);
9207 list_add(&rdev
->same_set
, &pending_raid_disks
);
9210 mutex_unlock(&detected_devices_mutex
);
9212 pr_debug("md: Scanned %d and added %d devices.\n", i_scanned
, i_passed
);
9214 autorun_devices(part
);
9217 #endif /* !MODULE */
9219 static __exit
void md_exit(void)
9221 struct mddev
*mddev
;
9222 struct list_head
*tmp
;
9225 blk_unregister_region(MKDEV(MD_MAJOR
,0), 512);
9226 blk_unregister_region(MKDEV(mdp_major
,0), 1U << MINORBITS
);
9228 unregister_blkdev(MD_MAJOR
,"md");
9229 unregister_blkdev(mdp_major
, "mdp");
9230 unregister_reboot_notifier(&md_notifier
);
9231 unregister_sysctl_table(raid_table_header
);
9233 /* We cannot unload the modules while some process is
9234 * waiting for us in select() or poll() - wake them up
9237 while (waitqueue_active(&md_event_waiters
)) {
9238 /* not safe to leave yet */
9239 wake_up(&md_event_waiters
);
9243 remove_proc_entry("mdstat", NULL
);
9245 for_each_mddev(mddev
, tmp
) {
9246 export_array(mddev
);
9248 mddev
->hold_active
= 0;
9250 * for_each_mddev() will call mddev_put() at the end of each
9251 * iteration. As the mddev is now fully clear, this will
9252 * schedule the mddev for destruction by a workqueue, and the
9253 * destroy_workqueue() below will wait for that to complete.
9256 destroy_workqueue(md_misc_wq
);
9257 destroy_workqueue(md_wq
);
9260 subsys_initcall(md_init
);
9261 module_exit(md_exit
)
9263 static int get_ro(char *buffer
, struct kernel_param
*kp
)
9265 return sprintf(buffer
, "%d", start_readonly
);
9267 static int set_ro(const char *val
, struct kernel_param
*kp
)
9269 return kstrtouint(val
, 10, (unsigned int *)&start_readonly
);
9272 module_param_call(start_ro
, set_ro
, get_ro
, NULL
, S_IRUSR
|S_IWUSR
);
9273 module_param(start_dirty_degraded
, int, S_IRUGO
|S_IWUSR
);
9274 module_param_call(new_array
, add_named_array
, NULL
, NULL
, S_IWUSR
);
9275 module_param(create_on_open
, bool, S_IRUSR
|S_IWUSR
);
9277 MODULE_LICENSE("GPL");
9278 MODULE_DESCRIPTION("MD RAID framework");
9280 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);