2 md.c : Multiple Devices driver for Linux
3 Copyright (C) 1998, 1999, 2000 Ingo Molnar
5 completely rewritten, based on the MD driver code from Marc Zyngier
9 - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar
10 - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com>
11 - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net>
12 - kerneld support by Boris Tobotras <boris@xtalk.msk.su>
13 - kmod support by: Cyrus Durgin
14 - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com>
15 - Devfs support by Richard Gooch <rgooch@atnf.csiro.au>
17 - lots of fixes and improvements to the RAID1/RAID5 and generic
18 RAID code (such as request based resynchronization):
20 Neil Brown <neilb@cse.unsw.edu.au>.
22 - persistent bitmap code
23 Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.
25 This program is free software; you can redistribute it and/or modify
26 it under the terms of the GNU General Public License as published by
27 the Free Software Foundation; either version 2, or (at your option)
30 You should have received a copy of the GNU General Public License
31 (for example /usr/src/linux/COPYING); if not, write to the Free
32 Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
34 Errors, Warnings, etc.
36 pr_crit() for error conditions that risk data loss
37 pr_err() for error conditions that are unexpected, like an IO error
38 or internal inconsistency
39 pr_warn() for error conditions that could have been predicated, like
40 adding a device to an array when it has incompatible metadata
41 pr_info() for every interesting, very rare events, like an array starting
42 or stopping, or resync starting or stopping
43 pr_debug() for everything else.
47 #include <linux/sched/signal.h>
48 #include <linux/kthread.h>
49 #include <linux/blkdev.h>
50 #include <linux/badblocks.h>
51 #include <linux/sysctl.h>
52 #include <linux/seq_file.h>
54 #include <linux/poll.h>
55 #include <linux/ctype.h>
56 #include <linux/string.h>
57 #include <linux/hdreg.h>
58 #include <linux/proc_fs.h>
59 #include <linux/random.h>
60 #include <linux/module.h>
61 #include <linux/reboot.h>
62 #include <linux/file.h>
63 #include <linux/compat.h>
64 #include <linux/delay.h>
65 #include <linux/raid/md_p.h>
66 #include <linux/raid/md_u.h>
67 #include <linux/slab.h>
68 #include <linux/percpu-refcount.h>
70 #include <trace/events/block.h>
72 #include "md-bitmap.h"
73 #include "md-cluster.h"
76 static void autostart_arrays(int part
);
79 /* pers_list is a list of registered personalities protected
81 * pers_lock does extra service to protect accesses to
82 * mddev->thread when the mutex cannot be held.
84 static LIST_HEAD(pers_list
);
85 static DEFINE_SPINLOCK(pers_lock
);
87 static struct kobj_type md_ktype
;
89 struct md_cluster_operations
*md_cluster_ops
;
90 EXPORT_SYMBOL(md_cluster_ops
);
91 struct module
*md_cluster_mod
;
92 EXPORT_SYMBOL(md_cluster_mod
);
94 static DECLARE_WAIT_QUEUE_HEAD(resync_wait
);
95 static struct workqueue_struct
*md_wq
;
96 static struct workqueue_struct
*md_misc_wq
;
98 static int remove_and_add_spares(struct mddev
*mddev
,
99 struct md_rdev
*this);
100 static void mddev_detach(struct mddev
*mddev
);
103 * Default number of read corrections we'll attempt on an rdev
104 * before ejecting it from the array. We divide the read error
105 * count by 2 for every hour elapsed between read errors.
107 #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
109 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
110 * is 1000 KB/sec, so the extra system load does not show up that much.
111 * Increase it if you want to have more _guaranteed_ speed. Note that
112 * the RAID driver will use the maximum available bandwidth if the IO
113 * subsystem is idle. There is also an 'absolute maximum' reconstruction
114 * speed limit - in case reconstruction slows down your system despite
117 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
118 * or /sys/block/mdX/md/sync_speed_{min,max}
121 static int sysctl_speed_limit_min
= 1000;
122 static int sysctl_speed_limit_max
= 200000;
123 static inline int speed_min(struct mddev
*mddev
)
125 return mddev
->sync_speed_min
?
126 mddev
->sync_speed_min
: sysctl_speed_limit_min
;
129 static inline int speed_max(struct mddev
*mddev
)
131 return mddev
->sync_speed_max
?
132 mddev
->sync_speed_max
: sysctl_speed_limit_max
;
135 static void * flush_info_alloc(gfp_t gfp_flags
, void *data
)
137 return kzalloc(sizeof(struct flush_info
), gfp_flags
);
139 static void flush_info_free(void *flush_info
, void *data
)
144 static void * flush_bio_alloc(gfp_t gfp_flags
, void *data
)
146 return kzalloc(sizeof(struct flush_bio
), gfp_flags
);
148 static void flush_bio_free(void *flush_bio
, void *data
)
153 static struct ctl_table_header
*raid_table_header
;
155 static struct ctl_table raid_table
[] = {
157 .procname
= "speed_limit_min",
158 .data
= &sysctl_speed_limit_min
,
159 .maxlen
= sizeof(int),
160 .mode
= S_IRUGO
|S_IWUSR
,
161 .proc_handler
= proc_dointvec
,
164 .procname
= "speed_limit_max",
165 .data
= &sysctl_speed_limit_max
,
166 .maxlen
= sizeof(int),
167 .mode
= S_IRUGO
|S_IWUSR
,
168 .proc_handler
= proc_dointvec
,
173 static struct ctl_table raid_dir_table
[] = {
177 .mode
= S_IRUGO
|S_IXUGO
,
183 static struct ctl_table raid_root_table
[] = {
188 .child
= raid_dir_table
,
193 static const struct block_device_operations md_fops
;
195 static int start_readonly
;
198 * The original mechanism for creating an md device is to create
199 * a device node in /dev and to open it. This causes races with device-close.
200 * The preferred method is to write to the "new_array" module parameter.
201 * This can avoid races.
202 * Setting create_on_open to false disables the original mechanism
203 * so all the races disappear.
205 static bool create_on_open
= true;
207 struct bio
*bio_alloc_mddev(gfp_t gfp_mask
, int nr_iovecs
,
212 if (!mddev
|| !bioset_initialized(&mddev
->bio_set
))
213 return bio_alloc(gfp_mask
, nr_iovecs
);
215 b
= bio_alloc_bioset(gfp_mask
, nr_iovecs
, &mddev
->bio_set
);
220 EXPORT_SYMBOL_GPL(bio_alloc_mddev
);
222 static struct bio
*md_bio_alloc_sync(struct mddev
*mddev
)
224 if (!mddev
|| !bioset_initialized(&mddev
->sync_set
))
225 return bio_alloc(GFP_NOIO
, 1);
227 return bio_alloc_bioset(GFP_NOIO
, 1, &mddev
->sync_set
);
231 * We have a system wide 'event count' that is incremented
232 * on any 'interesting' event, and readers of /proc/mdstat
233 * can use 'poll' or 'select' to find out when the event
237 * start array, stop array, error, add device, remove device,
238 * start build, activate spare
240 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters
);
241 static atomic_t md_event_count
;
242 void md_new_event(struct mddev
*mddev
)
244 atomic_inc(&md_event_count
);
245 wake_up(&md_event_waiters
);
247 EXPORT_SYMBOL_GPL(md_new_event
);
250 * Enables to iterate over all existing md arrays
251 * all_mddevs_lock protects this list.
253 static LIST_HEAD(all_mddevs
);
254 static DEFINE_SPINLOCK(all_mddevs_lock
);
257 * iterates through all used mddevs in the system.
258 * We take care to grab the all_mddevs_lock whenever navigating
259 * the list, and to always hold a refcount when unlocked.
260 * Any code which breaks out of this loop while own
261 * a reference to the current mddev and must mddev_put it.
263 #define for_each_mddev(_mddev,_tmp) \
265 for (({ spin_lock(&all_mddevs_lock); \
266 _tmp = all_mddevs.next; \
268 ({ if (_tmp != &all_mddevs) \
269 mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\
270 spin_unlock(&all_mddevs_lock); \
271 if (_mddev) mddev_put(_mddev); \
272 _mddev = list_entry(_tmp, struct mddev, all_mddevs); \
273 _tmp != &all_mddevs;}); \
274 ({ spin_lock(&all_mddevs_lock); \
275 _tmp = _tmp->next;}) \
278 /* Rather than calling directly into the personality make_request function,
279 * IO requests come here first so that we can check if the device is
280 * being suspended pending a reconfiguration.
281 * We hold a refcount over the call to ->make_request. By the time that
282 * call has finished, the bio has been linked into some internal structure
283 * and so is visible to ->quiesce(), so we don't need the refcount any more.
285 static bool is_suspended(struct mddev
*mddev
, struct bio
*bio
)
287 if (mddev
->suspended
)
289 if (bio_data_dir(bio
) != WRITE
)
291 if (mddev
->suspend_lo
>= mddev
->suspend_hi
)
293 if (bio
->bi_iter
.bi_sector
>= mddev
->suspend_hi
)
295 if (bio_end_sector(bio
) < mddev
->suspend_lo
)
300 void md_handle_request(struct mddev
*mddev
, struct bio
*bio
)
304 if (is_suspended(mddev
, bio
)) {
307 prepare_to_wait(&mddev
->sb_wait
, &__wait
,
308 TASK_UNINTERRUPTIBLE
);
309 if (!is_suspended(mddev
, bio
))
315 finish_wait(&mddev
->sb_wait
, &__wait
);
317 atomic_inc(&mddev
->active_io
);
320 if (!mddev
->pers
->make_request(mddev
, bio
)) {
321 atomic_dec(&mddev
->active_io
);
322 wake_up(&mddev
->sb_wait
);
323 goto check_suspended
;
326 if (atomic_dec_and_test(&mddev
->active_io
) && mddev
->suspended
)
327 wake_up(&mddev
->sb_wait
);
329 EXPORT_SYMBOL(md_handle_request
);
331 static blk_qc_t
md_make_request(struct request_queue
*q
, struct bio
*bio
)
333 const int rw
= bio_data_dir(bio
);
334 const int sgrp
= op_stat_group(bio_op(bio
));
335 struct mddev
*mddev
= q
->queuedata
;
336 unsigned int sectors
;
339 blk_queue_split(q
, &bio
);
341 if (mddev
== NULL
|| mddev
->pers
== NULL
) {
343 return BLK_QC_T_NONE
;
345 if (mddev
->ro
== 1 && unlikely(rw
== WRITE
)) {
346 if (bio_sectors(bio
) != 0)
347 bio
->bi_status
= BLK_STS_IOERR
;
349 return BLK_QC_T_NONE
;
353 * save the sectors now since our bio can
354 * go away inside make_request
356 sectors
= bio_sectors(bio
);
357 /* bio could be mergeable after passing to underlayer */
358 bio
->bi_opf
&= ~REQ_NOMERGE
;
360 md_handle_request(mddev
, bio
);
362 cpu
= part_stat_lock();
363 part_stat_inc(cpu
, &mddev
->gendisk
->part0
, ios
[sgrp
]);
364 part_stat_add(cpu
, &mddev
->gendisk
->part0
, sectors
[sgrp
], sectors
);
367 return BLK_QC_T_NONE
;
370 /* mddev_suspend makes sure no new requests are submitted
371 * to the device, and that any requests that have been submitted
372 * are completely handled.
373 * Once mddev_detach() is called and completes, the module will be
376 void mddev_suspend(struct mddev
*mddev
)
378 WARN_ON_ONCE(mddev
->thread
&& current
== mddev
->thread
->tsk
);
379 lockdep_assert_held(&mddev
->reconfig_mutex
);
380 if (mddev
->suspended
++)
383 wake_up(&mddev
->sb_wait
);
384 set_bit(MD_ALLOW_SB_UPDATE
, &mddev
->flags
);
385 smp_mb__after_atomic();
386 wait_event(mddev
->sb_wait
, atomic_read(&mddev
->active_io
) == 0);
387 mddev
->pers
->quiesce(mddev
, 1);
388 clear_bit_unlock(MD_ALLOW_SB_UPDATE
, &mddev
->flags
);
389 wait_event(mddev
->sb_wait
, !test_bit(MD_UPDATING_SB
, &mddev
->flags
));
391 del_timer_sync(&mddev
->safemode_timer
);
393 EXPORT_SYMBOL_GPL(mddev_suspend
);
395 void mddev_resume(struct mddev
*mddev
)
397 lockdep_assert_held(&mddev
->reconfig_mutex
);
398 if (--mddev
->suspended
)
400 wake_up(&mddev
->sb_wait
);
401 mddev
->pers
->quiesce(mddev
, 0);
403 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
404 md_wakeup_thread(mddev
->thread
);
405 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
407 EXPORT_SYMBOL_GPL(mddev_resume
);
409 int mddev_congested(struct mddev
*mddev
, int bits
)
411 struct md_personality
*pers
= mddev
->pers
;
415 if (mddev
->suspended
)
417 else if (pers
&& pers
->congested
)
418 ret
= pers
->congested(mddev
, bits
);
422 EXPORT_SYMBOL_GPL(mddev_congested
);
423 static int md_congested(void *data
, int bits
)
425 struct mddev
*mddev
= data
;
426 return mddev_congested(mddev
, bits
);
430 * Generic flush handling for md
432 static void submit_flushes(struct work_struct
*ws
)
434 struct flush_info
*fi
= container_of(ws
, struct flush_info
, flush_work
);
435 struct mddev
*mddev
= fi
->mddev
;
436 struct bio
*bio
= fi
->bio
;
438 bio
->bi_opf
&= ~REQ_PREFLUSH
;
439 md_handle_request(mddev
, bio
);
441 mempool_free(fi
, mddev
->flush_pool
);
444 static void md_end_flush(struct bio
*fbio
)
446 struct flush_bio
*fb
= fbio
->bi_private
;
447 struct md_rdev
*rdev
= fb
->rdev
;
448 struct flush_info
*fi
= fb
->fi
;
449 struct bio
*bio
= fi
->bio
;
450 struct mddev
*mddev
= fi
->mddev
;
452 rdev_dec_pending(rdev
, mddev
);
454 if (atomic_dec_and_test(&fi
->flush_pending
)) {
455 if (bio
->bi_iter
.bi_size
== 0) {
456 /* an empty barrier - all done */
458 mempool_free(fi
, mddev
->flush_pool
);
460 INIT_WORK(&fi
->flush_work
, submit_flushes
);
461 queue_work(md_wq
, &fi
->flush_work
);
465 mempool_free(fb
, mddev
->flush_bio_pool
);
469 void md_flush_request(struct mddev
*mddev
, struct bio
*bio
)
471 struct md_rdev
*rdev
;
472 struct flush_info
*fi
;
474 fi
= mempool_alloc(mddev
->flush_pool
, GFP_NOIO
);
478 atomic_set(&fi
->flush_pending
, 1);
481 rdev_for_each_rcu(rdev
, mddev
)
482 if (rdev
->raid_disk
>= 0 &&
483 !test_bit(Faulty
, &rdev
->flags
)) {
484 /* Take two references, one is dropped
485 * when request finishes, one after
486 * we reclaim rcu_read_lock
489 struct flush_bio
*fb
;
490 atomic_inc(&rdev
->nr_pending
);
491 atomic_inc(&rdev
->nr_pending
);
494 fb
= mempool_alloc(mddev
->flush_bio_pool
, GFP_NOIO
);
498 bi
= bio_alloc_mddev(GFP_NOIO
, 0, mddev
);
499 bio_set_dev(bi
, rdev
->bdev
);
500 bi
->bi_end_io
= md_end_flush
;
502 bi
->bi_opf
= REQ_OP_WRITE
| REQ_PREFLUSH
;
504 atomic_inc(&fi
->flush_pending
);
508 rdev_dec_pending(rdev
, mddev
);
512 if (atomic_dec_and_test(&fi
->flush_pending
)) {
513 if (bio
->bi_iter
.bi_size
== 0) {
514 /* an empty barrier - all done */
516 mempool_free(fi
, mddev
->flush_pool
);
518 INIT_WORK(&fi
->flush_work
, submit_flushes
);
519 queue_work(md_wq
, &fi
->flush_work
);
523 EXPORT_SYMBOL(md_flush_request
);
525 static inline struct mddev
*mddev_get(struct mddev
*mddev
)
527 atomic_inc(&mddev
->active
);
531 static void mddev_delayed_delete(struct work_struct
*ws
);
533 static void mddev_put(struct mddev
*mddev
)
535 if (!atomic_dec_and_lock(&mddev
->active
, &all_mddevs_lock
))
537 if (!mddev
->raid_disks
&& list_empty(&mddev
->disks
) &&
538 mddev
->ctime
== 0 && !mddev
->hold_active
) {
539 /* Array is not configured at all, and not held active,
541 list_del_init(&mddev
->all_mddevs
);
544 * Call queue_work inside the spinlock so that
545 * flush_workqueue() after mddev_find will succeed in waiting
546 * for the work to be done.
548 INIT_WORK(&mddev
->del_work
, mddev_delayed_delete
);
549 queue_work(md_misc_wq
, &mddev
->del_work
);
551 spin_unlock(&all_mddevs_lock
);
554 static void md_safemode_timeout(struct timer_list
*t
);
556 void mddev_init(struct mddev
*mddev
)
558 kobject_init(&mddev
->kobj
, &md_ktype
);
559 mutex_init(&mddev
->open_mutex
);
560 mutex_init(&mddev
->reconfig_mutex
);
561 mutex_init(&mddev
->bitmap_info
.mutex
);
562 INIT_LIST_HEAD(&mddev
->disks
);
563 INIT_LIST_HEAD(&mddev
->all_mddevs
);
564 timer_setup(&mddev
->safemode_timer
, md_safemode_timeout
, 0);
565 atomic_set(&mddev
->active
, 1);
566 atomic_set(&mddev
->openers
, 0);
567 atomic_set(&mddev
->active_io
, 0);
568 spin_lock_init(&mddev
->lock
);
569 init_waitqueue_head(&mddev
->sb_wait
);
570 init_waitqueue_head(&mddev
->recovery_wait
);
571 mddev
->reshape_position
= MaxSector
;
572 mddev
->reshape_backwards
= 0;
573 mddev
->last_sync_action
= "none";
574 mddev
->resync_min
= 0;
575 mddev
->resync_max
= MaxSector
;
576 mddev
->level
= LEVEL_NONE
;
578 EXPORT_SYMBOL_GPL(mddev_init
);
580 static struct mddev
*mddev_find(dev_t unit
)
582 struct mddev
*mddev
, *new = NULL
;
584 if (unit
&& MAJOR(unit
) != MD_MAJOR
)
585 unit
&= ~((1<<MdpMinorShift
)-1);
588 spin_lock(&all_mddevs_lock
);
591 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
592 if (mddev
->unit
== unit
) {
594 spin_unlock(&all_mddevs_lock
);
600 list_add(&new->all_mddevs
, &all_mddevs
);
601 spin_unlock(&all_mddevs_lock
);
602 new->hold_active
= UNTIL_IOCTL
;
606 /* find an unused unit number */
607 static int next_minor
= 512;
608 int start
= next_minor
;
612 dev
= MKDEV(MD_MAJOR
, next_minor
);
614 if (next_minor
> MINORMASK
)
616 if (next_minor
== start
) {
617 /* Oh dear, all in use. */
618 spin_unlock(&all_mddevs_lock
);
624 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
625 if (mddev
->unit
== dev
) {
631 new->md_minor
= MINOR(dev
);
632 new->hold_active
= UNTIL_STOP
;
633 list_add(&new->all_mddevs
, &all_mddevs
);
634 spin_unlock(&all_mddevs_lock
);
637 spin_unlock(&all_mddevs_lock
);
639 new = kzalloc(sizeof(*new), GFP_KERNEL
);
644 if (MAJOR(unit
) == MD_MAJOR
)
645 new->md_minor
= MINOR(unit
);
647 new->md_minor
= MINOR(unit
) >> MdpMinorShift
;
654 static struct attribute_group md_redundancy_group
;
656 void mddev_unlock(struct mddev
*mddev
)
658 if (mddev
->to_remove
) {
659 /* These cannot be removed under reconfig_mutex as
660 * an access to the files will try to take reconfig_mutex
661 * while holding the file unremovable, which leads to
663 * So hold set sysfs_active while the remove in happeing,
664 * and anything else which might set ->to_remove or my
665 * otherwise change the sysfs namespace will fail with
666 * -EBUSY if sysfs_active is still set.
667 * We set sysfs_active under reconfig_mutex and elsewhere
668 * test it under the same mutex to ensure its correct value
671 struct attribute_group
*to_remove
= mddev
->to_remove
;
672 mddev
->to_remove
= NULL
;
673 mddev
->sysfs_active
= 1;
674 mutex_unlock(&mddev
->reconfig_mutex
);
676 if (mddev
->kobj
.sd
) {
677 if (to_remove
!= &md_redundancy_group
)
678 sysfs_remove_group(&mddev
->kobj
, to_remove
);
679 if (mddev
->pers
== NULL
||
680 mddev
->pers
->sync_request
== NULL
) {
681 sysfs_remove_group(&mddev
->kobj
, &md_redundancy_group
);
682 if (mddev
->sysfs_action
)
683 sysfs_put(mddev
->sysfs_action
);
684 mddev
->sysfs_action
= NULL
;
687 mddev
->sysfs_active
= 0;
689 mutex_unlock(&mddev
->reconfig_mutex
);
691 /* As we've dropped the mutex we need a spinlock to
692 * make sure the thread doesn't disappear
694 spin_lock(&pers_lock
);
695 md_wakeup_thread(mddev
->thread
);
696 wake_up(&mddev
->sb_wait
);
697 spin_unlock(&pers_lock
);
699 EXPORT_SYMBOL_GPL(mddev_unlock
);
701 struct md_rdev
*md_find_rdev_nr_rcu(struct mddev
*mddev
, int nr
)
703 struct md_rdev
*rdev
;
705 rdev_for_each_rcu(rdev
, mddev
)
706 if (rdev
->desc_nr
== nr
)
711 EXPORT_SYMBOL_GPL(md_find_rdev_nr_rcu
);
713 static struct md_rdev
*find_rdev(struct mddev
*mddev
, dev_t dev
)
715 struct md_rdev
*rdev
;
717 rdev_for_each(rdev
, mddev
)
718 if (rdev
->bdev
->bd_dev
== dev
)
724 struct md_rdev
*md_find_rdev_rcu(struct mddev
*mddev
, dev_t dev
)
726 struct md_rdev
*rdev
;
728 rdev_for_each_rcu(rdev
, mddev
)
729 if (rdev
->bdev
->bd_dev
== dev
)
734 EXPORT_SYMBOL_GPL(md_find_rdev_rcu
);
736 static struct md_personality
*find_pers(int level
, char *clevel
)
738 struct md_personality
*pers
;
739 list_for_each_entry(pers
, &pers_list
, list
) {
740 if (level
!= LEVEL_NONE
&& pers
->level
== level
)
742 if (strcmp(pers
->name
, clevel
)==0)
748 /* return the offset of the super block in 512byte sectors */
749 static inline sector_t
calc_dev_sboffset(struct md_rdev
*rdev
)
751 sector_t num_sectors
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
752 return MD_NEW_SIZE_SECTORS(num_sectors
);
755 static int alloc_disk_sb(struct md_rdev
*rdev
)
757 rdev
->sb_page
= alloc_page(GFP_KERNEL
);
763 void md_rdev_clear(struct md_rdev
*rdev
)
766 put_page(rdev
->sb_page
);
768 rdev
->sb_page
= NULL
;
773 put_page(rdev
->bb_page
);
774 rdev
->bb_page
= NULL
;
776 badblocks_exit(&rdev
->badblocks
);
778 EXPORT_SYMBOL_GPL(md_rdev_clear
);
780 static void super_written(struct bio
*bio
)
782 struct md_rdev
*rdev
= bio
->bi_private
;
783 struct mddev
*mddev
= rdev
->mddev
;
785 if (bio
->bi_status
) {
786 pr_err("md: super_written gets error=%d\n", bio
->bi_status
);
787 md_error(mddev
, rdev
);
788 if (!test_bit(Faulty
, &rdev
->flags
)
789 && (bio
->bi_opf
& MD_FAILFAST
)) {
790 set_bit(MD_SB_NEED_REWRITE
, &mddev
->sb_flags
);
791 set_bit(LastDev
, &rdev
->flags
);
794 clear_bit(LastDev
, &rdev
->flags
);
796 if (atomic_dec_and_test(&mddev
->pending_writes
))
797 wake_up(&mddev
->sb_wait
);
798 rdev_dec_pending(rdev
, mddev
);
802 void md_super_write(struct mddev
*mddev
, struct md_rdev
*rdev
,
803 sector_t sector
, int size
, struct page
*page
)
805 /* write first size bytes of page to sector of rdev
806 * Increment mddev->pending_writes before returning
807 * and decrement it on completion, waking up sb_wait
808 * if zero is reached.
809 * If an error occurred, call md_error
817 if (test_bit(Faulty
, &rdev
->flags
))
820 bio
= md_bio_alloc_sync(mddev
);
822 atomic_inc(&rdev
->nr_pending
);
824 bio_set_dev(bio
, rdev
->meta_bdev
? rdev
->meta_bdev
: rdev
->bdev
);
825 bio
->bi_iter
.bi_sector
= sector
;
826 bio_add_page(bio
, page
, size
, 0);
827 bio
->bi_private
= rdev
;
828 bio
->bi_end_io
= super_written
;
830 if (test_bit(MD_FAILFAST_SUPPORTED
, &mddev
->flags
) &&
831 test_bit(FailFast
, &rdev
->flags
) &&
832 !test_bit(LastDev
, &rdev
->flags
))
834 bio
->bi_opf
= REQ_OP_WRITE
| REQ_SYNC
| REQ_PREFLUSH
| REQ_FUA
| ff
;
836 atomic_inc(&mddev
->pending_writes
);
840 int md_super_wait(struct mddev
*mddev
)
842 /* wait for all superblock writes that were scheduled to complete */
843 wait_event(mddev
->sb_wait
, atomic_read(&mddev
->pending_writes
)==0);
844 if (test_and_clear_bit(MD_SB_NEED_REWRITE
, &mddev
->sb_flags
))
849 int sync_page_io(struct md_rdev
*rdev
, sector_t sector
, int size
,
850 struct page
*page
, int op
, int op_flags
, bool metadata_op
)
852 struct bio
*bio
= md_bio_alloc_sync(rdev
->mddev
);
855 if (metadata_op
&& rdev
->meta_bdev
)
856 bio_set_dev(bio
, rdev
->meta_bdev
);
858 bio_set_dev(bio
, rdev
->bdev
);
859 bio_set_op_attrs(bio
, op
, op_flags
);
861 bio
->bi_iter
.bi_sector
= sector
+ rdev
->sb_start
;
862 else if (rdev
->mddev
->reshape_position
!= MaxSector
&&
863 (rdev
->mddev
->reshape_backwards
==
864 (sector
>= rdev
->mddev
->reshape_position
)))
865 bio
->bi_iter
.bi_sector
= sector
+ rdev
->new_data_offset
;
867 bio
->bi_iter
.bi_sector
= sector
+ rdev
->data_offset
;
868 bio_add_page(bio
, page
, size
, 0);
870 submit_bio_wait(bio
);
872 ret
= !bio
->bi_status
;
876 EXPORT_SYMBOL_GPL(sync_page_io
);
878 static int read_disk_sb(struct md_rdev
*rdev
, int size
)
880 char b
[BDEVNAME_SIZE
];
885 if (!sync_page_io(rdev
, 0, size
, rdev
->sb_page
, REQ_OP_READ
, 0, true))
891 pr_err("md: disabled device %s, could not read superblock.\n",
892 bdevname(rdev
->bdev
,b
));
896 static int md_uuid_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
898 return sb1
->set_uuid0
== sb2
->set_uuid0
&&
899 sb1
->set_uuid1
== sb2
->set_uuid1
&&
900 sb1
->set_uuid2
== sb2
->set_uuid2
&&
901 sb1
->set_uuid3
== sb2
->set_uuid3
;
904 static int md_sb_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
907 mdp_super_t
*tmp1
, *tmp2
;
909 tmp1
= kmalloc(sizeof(*tmp1
),GFP_KERNEL
);
910 tmp2
= kmalloc(sizeof(*tmp2
),GFP_KERNEL
);
912 if (!tmp1
|| !tmp2
) {
921 * nr_disks is not constant
926 ret
= (memcmp(tmp1
, tmp2
, MD_SB_GENERIC_CONSTANT_WORDS
* 4) == 0);
933 static u32
md_csum_fold(u32 csum
)
935 csum
= (csum
& 0xffff) + (csum
>> 16);
936 return (csum
& 0xffff) + (csum
>> 16);
939 static unsigned int calc_sb_csum(mdp_super_t
*sb
)
942 u32
*sb32
= (u32
*)sb
;
944 unsigned int disk_csum
, csum
;
946 disk_csum
= sb
->sb_csum
;
949 for (i
= 0; i
< MD_SB_BYTES
/4 ; i
++)
951 csum
= (newcsum
& 0xffffffff) + (newcsum
>>32);
954 /* This used to use csum_partial, which was wrong for several
955 * reasons including that different results are returned on
956 * different architectures. It isn't critical that we get exactly
957 * the same return value as before (we always csum_fold before
958 * testing, and that removes any differences). However as we
959 * know that csum_partial always returned a 16bit value on
960 * alphas, do a fold to maximise conformity to previous behaviour.
962 sb
->sb_csum
= md_csum_fold(disk_csum
);
964 sb
->sb_csum
= disk_csum
;
970 * Handle superblock details.
971 * We want to be able to handle multiple superblock formats
972 * so we have a common interface to them all, and an array of
973 * different handlers.
974 * We rely on user-space to write the initial superblock, and support
975 * reading and updating of superblocks.
976 * Interface methods are:
977 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version)
978 * loads and validates a superblock on dev.
979 * if refdev != NULL, compare superblocks on both devices
981 * 0 - dev has a superblock that is compatible with refdev
982 * 1 - dev has a superblock that is compatible and newer than refdev
983 * so dev should be used as the refdev in future
984 * -EINVAL superblock incompatible or invalid
985 * -othererror e.g. -EIO
987 * int validate_super(struct mddev *mddev, struct md_rdev *dev)
988 * Verify that dev is acceptable into mddev.
989 * The first time, mddev->raid_disks will be 0, and data from
990 * dev should be merged in. Subsequent calls check that dev
991 * is new enough. Return 0 or -EINVAL
993 * void sync_super(struct mddev *mddev, struct md_rdev *dev)
994 * Update the superblock for rdev with data in mddev
995 * This does not write to disc.
1001 struct module
*owner
;
1002 int (*load_super
)(struct md_rdev
*rdev
,
1003 struct md_rdev
*refdev
,
1005 int (*validate_super
)(struct mddev
*mddev
,
1006 struct md_rdev
*rdev
);
1007 void (*sync_super
)(struct mddev
*mddev
,
1008 struct md_rdev
*rdev
);
1009 unsigned long long (*rdev_size_change
)(struct md_rdev
*rdev
,
1010 sector_t num_sectors
);
1011 int (*allow_new_offset
)(struct md_rdev
*rdev
,
1012 unsigned long long new_offset
);
1016 * Check that the given mddev has no bitmap.
1018 * This function is called from the run method of all personalities that do not
1019 * support bitmaps. It prints an error message and returns non-zero if mddev
1020 * has a bitmap. Otherwise, it returns 0.
1023 int md_check_no_bitmap(struct mddev
*mddev
)
1025 if (!mddev
->bitmap_info
.file
&& !mddev
->bitmap_info
.offset
)
1027 pr_warn("%s: bitmaps are not supported for %s\n",
1028 mdname(mddev
), mddev
->pers
->name
);
1031 EXPORT_SYMBOL(md_check_no_bitmap
);
1034 * load_super for 0.90.0
1036 static int super_90_load(struct md_rdev
*rdev
, struct md_rdev
*refdev
, int minor_version
)
1038 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1043 * Calculate the position of the superblock (512byte sectors),
1044 * it's at the end of the disk.
1046 * It also happens to be a multiple of 4Kb.
1048 rdev
->sb_start
= calc_dev_sboffset(rdev
);
1050 ret
= read_disk_sb(rdev
, MD_SB_BYTES
);
1056 bdevname(rdev
->bdev
, b
);
1057 sb
= page_address(rdev
->sb_page
);
1059 if (sb
->md_magic
!= MD_SB_MAGIC
) {
1060 pr_warn("md: invalid raid superblock magic on %s\n", b
);
1064 if (sb
->major_version
!= 0 ||
1065 sb
->minor_version
< 90 ||
1066 sb
->minor_version
> 91) {
1067 pr_warn("Bad version number %d.%d on %s\n",
1068 sb
->major_version
, sb
->minor_version
, b
);
1072 if (sb
->raid_disks
<= 0)
1075 if (md_csum_fold(calc_sb_csum(sb
)) != md_csum_fold(sb
->sb_csum
)) {
1076 pr_warn("md: invalid superblock checksum on %s\n", b
);
1080 rdev
->preferred_minor
= sb
->md_minor
;
1081 rdev
->data_offset
= 0;
1082 rdev
->new_data_offset
= 0;
1083 rdev
->sb_size
= MD_SB_BYTES
;
1084 rdev
->badblocks
.shift
= -1;
1086 if (sb
->level
== LEVEL_MULTIPATH
)
1089 rdev
->desc_nr
= sb
->this_disk
.number
;
1095 mdp_super_t
*refsb
= page_address(refdev
->sb_page
);
1096 if (!md_uuid_equal(refsb
, sb
)) {
1097 pr_warn("md: %s has different UUID to %s\n",
1098 b
, bdevname(refdev
->bdev
,b2
));
1101 if (!md_sb_equal(refsb
, sb
)) {
1102 pr_warn("md: %s has same UUID but different superblock to %s\n",
1103 b
, bdevname(refdev
->bdev
, b2
));
1107 ev2
= md_event(refsb
);
1113 rdev
->sectors
= rdev
->sb_start
;
1114 /* Limit to 4TB as metadata cannot record more than that.
1115 * (not needed for Linear and RAID0 as metadata doesn't
1118 if (IS_ENABLED(CONFIG_LBDAF
) && (u64
)rdev
->sectors
>= (2ULL << 32) &&
1120 rdev
->sectors
= (sector_t
)(2ULL << 32) - 2;
1122 if (rdev
->sectors
< ((sector_t
)sb
->size
) * 2 && sb
->level
>= 1)
1123 /* "this cannot possibly happen" ... */
1131 * validate_super for 0.90.0
1133 static int super_90_validate(struct mddev
*mddev
, struct md_rdev
*rdev
)
1136 mdp_super_t
*sb
= page_address(rdev
->sb_page
);
1137 __u64 ev1
= md_event(sb
);
1139 rdev
->raid_disk
= -1;
1140 clear_bit(Faulty
, &rdev
->flags
);
1141 clear_bit(In_sync
, &rdev
->flags
);
1142 clear_bit(Bitmap_sync
, &rdev
->flags
);
1143 clear_bit(WriteMostly
, &rdev
->flags
);
1145 if (mddev
->raid_disks
== 0) {
1146 mddev
->major_version
= 0;
1147 mddev
->minor_version
= sb
->minor_version
;
1148 mddev
->patch_version
= sb
->patch_version
;
1149 mddev
->external
= 0;
1150 mddev
->chunk_sectors
= sb
->chunk_size
>> 9;
1151 mddev
->ctime
= sb
->ctime
;
1152 mddev
->utime
= sb
->utime
;
1153 mddev
->level
= sb
->level
;
1154 mddev
->clevel
[0] = 0;
1155 mddev
->layout
= sb
->layout
;
1156 mddev
->raid_disks
= sb
->raid_disks
;
1157 mddev
->dev_sectors
= ((sector_t
)sb
->size
) * 2;
1158 mddev
->events
= ev1
;
1159 mddev
->bitmap_info
.offset
= 0;
1160 mddev
->bitmap_info
.space
= 0;
1161 /* bitmap can use 60 K after the 4K superblocks */
1162 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
1163 mddev
->bitmap_info
.default_space
= 64*2 - (MD_SB_BYTES
>> 9);
1164 mddev
->reshape_backwards
= 0;
1166 if (mddev
->minor_version
>= 91) {
1167 mddev
->reshape_position
= sb
->reshape_position
;
1168 mddev
->delta_disks
= sb
->delta_disks
;
1169 mddev
->new_level
= sb
->new_level
;
1170 mddev
->new_layout
= sb
->new_layout
;
1171 mddev
->new_chunk_sectors
= sb
->new_chunk
>> 9;
1172 if (mddev
->delta_disks
< 0)
1173 mddev
->reshape_backwards
= 1;
1175 mddev
->reshape_position
= MaxSector
;
1176 mddev
->delta_disks
= 0;
1177 mddev
->new_level
= mddev
->level
;
1178 mddev
->new_layout
= mddev
->layout
;
1179 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1182 if (sb
->state
& (1<<MD_SB_CLEAN
))
1183 mddev
->recovery_cp
= MaxSector
;
1185 if (sb
->events_hi
== sb
->cp_events_hi
&&
1186 sb
->events_lo
== sb
->cp_events_lo
) {
1187 mddev
->recovery_cp
= sb
->recovery_cp
;
1189 mddev
->recovery_cp
= 0;
1192 memcpy(mddev
->uuid
+0, &sb
->set_uuid0
, 4);
1193 memcpy(mddev
->uuid
+4, &sb
->set_uuid1
, 4);
1194 memcpy(mddev
->uuid
+8, &sb
->set_uuid2
, 4);
1195 memcpy(mddev
->uuid
+12,&sb
->set_uuid3
, 4);
1197 mddev
->max_disks
= MD_SB_DISKS
;
1199 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
) &&
1200 mddev
->bitmap_info
.file
== NULL
) {
1201 mddev
->bitmap_info
.offset
=
1202 mddev
->bitmap_info
.default_offset
;
1203 mddev
->bitmap_info
.space
=
1204 mddev
->bitmap_info
.default_space
;
1207 } else if (mddev
->pers
== NULL
) {
1208 /* Insist on good event counter while assembling, except
1209 * for spares (which don't need an event count) */
1211 if (sb
->disks
[rdev
->desc_nr
].state
& (
1212 (1<<MD_DISK_SYNC
) | (1 << MD_DISK_ACTIVE
)))
1213 if (ev1
< mddev
->events
)
1215 } else if (mddev
->bitmap
) {
1216 /* if adding to array with a bitmap, then we can accept an
1217 * older device ... but not too old.
1219 if (ev1
< mddev
->bitmap
->events_cleared
)
1221 if (ev1
< mddev
->events
)
1222 set_bit(Bitmap_sync
, &rdev
->flags
);
1224 if (ev1
< mddev
->events
)
1225 /* just a hot-add of a new device, leave raid_disk at -1 */
1229 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1230 desc
= sb
->disks
+ rdev
->desc_nr
;
1232 if (desc
->state
& (1<<MD_DISK_FAULTY
))
1233 set_bit(Faulty
, &rdev
->flags
);
1234 else if (desc
->state
& (1<<MD_DISK_SYNC
) /* &&
1235 desc->raid_disk < mddev->raid_disks */) {
1236 set_bit(In_sync
, &rdev
->flags
);
1237 rdev
->raid_disk
= desc
->raid_disk
;
1238 rdev
->saved_raid_disk
= desc
->raid_disk
;
1239 } else if (desc
->state
& (1<<MD_DISK_ACTIVE
)) {
1240 /* active but not in sync implies recovery up to
1241 * reshape position. We don't know exactly where
1242 * that is, so set to zero for now */
1243 if (mddev
->minor_version
>= 91) {
1244 rdev
->recovery_offset
= 0;
1245 rdev
->raid_disk
= desc
->raid_disk
;
1248 if (desc
->state
& (1<<MD_DISK_WRITEMOSTLY
))
1249 set_bit(WriteMostly
, &rdev
->flags
);
1250 if (desc
->state
& (1<<MD_DISK_FAILFAST
))
1251 set_bit(FailFast
, &rdev
->flags
);
1252 } else /* MULTIPATH are always insync */
1253 set_bit(In_sync
, &rdev
->flags
);
1258 * sync_super for 0.90.0
1260 static void super_90_sync(struct mddev
*mddev
, struct md_rdev
*rdev
)
1263 struct md_rdev
*rdev2
;
1264 int next_spare
= mddev
->raid_disks
;
1266 /* make rdev->sb match mddev data..
1269 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1270 * 3/ any empty disks < next_spare become removed
1272 * disks[0] gets initialised to REMOVED because
1273 * we cannot be sure from other fields if it has
1274 * been initialised or not.
1277 int active
=0, working
=0,failed
=0,spare
=0,nr_disks
=0;
1279 rdev
->sb_size
= MD_SB_BYTES
;
1281 sb
= page_address(rdev
->sb_page
);
1283 memset(sb
, 0, sizeof(*sb
));
1285 sb
->md_magic
= MD_SB_MAGIC
;
1286 sb
->major_version
= mddev
->major_version
;
1287 sb
->patch_version
= mddev
->patch_version
;
1288 sb
->gvalid_words
= 0; /* ignored */
1289 memcpy(&sb
->set_uuid0
, mddev
->uuid
+0, 4);
1290 memcpy(&sb
->set_uuid1
, mddev
->uuid
+4, 4);
1291 memcpy(&sb
->set_uuid2
, mddev
->uuid
+8, 4);
1292 memcpy(&sb
->set_uuid3
, mddev
->uuid
+12,4);
1294 sb
->ctime
= clamp_t(time64_t
, mddev
->ctime
, 0, U32_MAX
);
1295 sb
->level
= mddev
->level
;
1296 sb
->size
= mddev
->dev_sectors
/ 2;
1297 sb
->raid_disks
= mddev
->raid_disks
;
1298 sb
->md_minor
= mddev
->md_minor
;
1299 sb
->not_persistent
= 0;
1300 sb
->utime
= clamp_t(time64_t
, mddev
->utime
, 0, U32_MAX
);
1302 sb
->events_hi
= (mddev
->events
>>32);
1303 sb
->events_lo
= (u32
)mddev
->events
;
1305 if (mddev
->reshape_position
== MaxSector
)
1306 sb
->minor_version
= 90;
1308 sb
->minor_version
= 91;
1309 sb
->reshape_position
= mddev
->reshape_position
;
1310 sb
->new_level
= mddev
->new_level
;
1311 sb
->delta_disks
= mddev
->delta_disks
;
1312 sb
->new_layout
= mddev
->new_layout
;
1313 sb
->new_chunk
= mddev
->new_chunk_sectors
<< 9;
1315 mddev
->minor_version
= sb
->minor_version
;
1318 sb
->recovery_cp
= mddev
->recovery_cp
;
1319 sb
->cp_events_hi
= (mddev
->events
>>32);
1320 sb
->cp_events_lo
= (u32
)mddev
->events
;
1321 if (mddev
->recovery_cp
== MaxSector
)
1322 sb
->state
= (1<< MD_SB_CLEAN
);
1324 sb
->recovery_cp
= 0;
1326 sb
->layout
= mddev
->layout
;
1327 sb
->chunk_size
= mddev
->chunk_sectors
<< 9;
1329 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
)
1330 sb
->state
|= (1<<MD_SB_BITMAP_PRESENT
);
1332 sb
->disks
[0].state
= (1<<MD_DISK_REMOVED
);
1333 rdev_for_each(rdev2
, mddev
) {
1336 int is_active
= test_bit(In_sync
, &rdev2
->flags
);
1338 if (rdev2
->raid_disk
>= 0 &&
1339 sb
->minor_version
>= 91)
1340 /* we have nowhere to store the recovery_offset,
1341 * but if it is not below the reshape_position,
1342 * we can piggy-back on that.
1345 if (rdev2
->raid_disk
< 0 ||
1346 test_bit(Faulty
, &rdev2
->flags
))
1349 desc_nr
= rdev2
->raid_disk
;
1351 desc_nr
= next_spare
++;
1352 rdev2
->desc_nr
= desc_nr
;
1353 d
= &sb
->disks
[rdev2
->desc_nr
];
1355 d
->number
= rdev2
->desc_nr
;
1356 d
->major
= MAJOR(rdev2
->bdev
->bd_dev
);
1357 d
->minor
= MINOR(rdev2
->bdev
->bd_dev
);
1359 d
->raid_disk
= rdev2
->raid_disk
;
1361 d
->raid_disk
= rdev2
->desc_nr
; /* compatibility */
1362 if (test_bit(Faulty
, &rdev2
->flags
))
1363 d
->state
= (1<<MD_DISK_FAULTY
);
1364 else if (is_active
) {
1365 d
->state
= (1<<MD_DISK_ACTIVE
);
1366 if (test_bit(In_sync
, &rdev2
->flags
))
1367 d
->state
|= (1<<MD_DISK_SYNC
);
1375 if (test_bit(WriteMostly
, &rdev2
->flags
))
1376 d
->state
|= (1<<MD_DISK_WRITEMOSTLY
);
1377 if (test_bit(FailFast
, &rdev2
->flags
))
1378 d
->state
|= (1<<MD_DISK_FAILFAST
);
1380 /* now set the "removed" and "faulty" bits on any missing devices */
1381 for (i
=0 ; i
< mddev
->raid_disks
; i
++) {
1382 mdp_disk_t
*d
= &sb
->disks
[i
];
1383 if (d
->state
== 0 && d
->number
== 0) {
1386 d
->state
= (1<<MD_DISK_REMOVED
);
1387 d
->state
|= (1<<MD_DISK_FAULTY
);
1391 sb
->nr_disks
= nr_disks
;
1392 sb
->active_disks
= active
;
1393 sb
->working_disks
= working
;
1394 sb
->failed_disks
= failed
;
1395 sb
->spare_disks
= spare
;
1397 sb
->this_disk
= sb
->disks
[rdev
->desc_nr
];
1398 sb
->sb_csum
= calc_sb_csum(sb
);
1402 * rdev_size_change for 0.90.0
1404 static unsigned long long
1405 super_90_rdev_size_change(struct md_rdev
*rdev
, sector_t num_sectors
)
1407 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1408 return 0; /* component must fit device */
1409 if (rdev
->mddev
->bitmap_info
.offset
)
1410 return 0; /* can't move bitmap */
1411 rdev
->sb_start
= calc_dev_sboffset(rdev
);
1412 if (!num_sectors
|| num_sectors
> rdev
->sb_start
)
1413 num_sectors
= rdev
->sb_start
;
1414 /* Limit to 4TB as metadata cannot record more than that.
1415 * 4TB == 2^32 KB, or 2*2^32 sectors.
1417 if (IS_ENABLED(CONFIG_LBDAF
) && (u64
)num_sectors
>= (2ULL << 32) &&
1418 rdev
->mddev
->level
>= 1)
1419 num_sectors
= (sector_t
)(2ULL << 32) - 2;
1421 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1423 } while (md_super_wait(rdev
->mddev
) < 0);
1428 super_90_allow_new_offset(struct md_rdev
*rdev
, unsigned long long new_offset
)
1430 /* non-zero offset changes not possible with v0.90 */
1431 return new_offset
== 0;
1435 * version 1 superblock
1438 static __le32
calc_sb_1_csum(struct mdp_superblock_1
*sb
)
1442 unsigned long long newcsum
;
1443 int size
= 256 + le32_to_cpu(sb
->max_dev
)*2;
1444 __le32
*isuper
= (__le32
*)sb
;
1446 disk_csum
= sb
->sb_csum
;
1449 for (; size
>= 4; size
-= 4)
1450 newcsum
+= le32_to_cpu(*isuper
++);
1453 newcsum
+= le16_to_cpu(*(__le16
*) isuper
);
1455 csum
= (newcsum
& 0xffffffff) + (newcsum
>> 32);
1456 sb
->sb_csum
= disk_csum
;
1457 return cpu_to_le32(csum
);
1460 static int super_1_load(struct md_rdev
*rdev
, struct md_rdev
*refdev
, int minor_version
)
1462 struct mdp_superblock_1
*sb
;
1466 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1470 * Calculate the position of the superblock in 512byte sectors.
1471 * It is always aligned to a 4K boundary and
1472 * depeding on minor_version, it can be:
1473 * 0: At least 8K, but less than 12K, from end of device
1474 * 1: At start of device
1475 * 2: 4K from start of device.
1477 switch(minor_version
) {
1479 sb_start
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1481 sb_start
&= ~(sector_t
)(4*2-1);
1492 rdev
->sb_start
= sb_start
;
1494 /* superblock is rarely larger than 1K, but it can be larger,
1495 * and it is safe to read 4k, so we do that
1497 ret
= read_disk_sb(rdev
, 4096);
1498 if (ret
) return ret
;
1500 sb
= page_address(rdev
->sb_page
);
1502 if (sb
->magic
!= cpu_to_le32(MD_SB_MAGIC
) ||
1503 sb
->major_version
!= cpu_to_le32(1) ||
1504 le32_to_cpu(sb
->max_dev
) > (4096-256)/2 ||
1505 le64_to_cpu(sb
->super_offset
) != rdev
->sb_start
||
1506 (le32_to_cpu(sb
->feature_map
) & ~MD_FEATURE_ALL
) != 0)
1509 if (calc_sb_1_csum(sb
) != sb
->sb_csum
) {
1510 pr_warn("md: invalid superblock checksum on %s\n",
1511 bdevname(rdev
->bdev
,b
));
1514 if (le64_to_cpu(sb
->data_size
) < 10) {
1515 pr_warn("md: data_size too small on %s\n",
1516 bdevname(rdev
->bdev
,b
));
1521 memcmp(sb
->pad3
, sb
->pad3
+1, sizeof(sb
->pad3
) - sizeof(sb
->pad3
[1])))
1522 /* Some padding is non-zero, might be a new feature */
1525 rdev
->preferred_minor
= 0xffff;
1526 rdev
->data_offset
= le64_to_cpu(sb
->data_offset
);
1527 rdev
->new_data_offset
= rdev
->data_offset
;
1528 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
) &&
1529 (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_NEW_OFFSET
))
1530 rdev
->new_data_offset
+= (s32
)le32_to_cpu(sb
->new_offset
);
1531 atomic_set(&rdev
->corrected_errors
, le32_to_cpu(sb
->cnt_corrected_read
));
1533 rdev
->sb_size
= le32_to_cpu(sb
->max_dev
) * 2 + 256;
1534 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1535 if (rdev
->sb_size
& bmask
)
1536 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1539 && rdev
->data_offset
< sb_start
+ (rdev
->sb_size
/512))
1542 && rdev
->new_data_offset
< sb_start
+ (rdev
->sb_size
/512))
1545 if (sb
->level
== cpu_to_le32(LEVEL_MULTIPATH
))
1548 rdev
->desc_nr
= le32_to_cpu(sb
->dev_number
);
1550 if (!rdev
->bb_page
) {
1551 rdev
->bb_page
= alloc_page(GFP_KERNEL
);
1555 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BAD_BLOCKS
) &&
1556 rdev
->badblocks
.count
== 0) {
1557 /* need to load the bad block list.
1558 * Currently we limit it to one page.
1564 int sectors
= le16_to_cpu(sb
->bblog_size
);
1565 if (sectors
> (PAGE_SIZE
/ 512))
1567 offset
= le32_to_cpu(sb
->bblog_offset
);
1570 bb_sector
= (long long)offset
;
1571 if (!sync_page_io(rdev
, bb_sector
, sectors
<< 9,
1572 rdev
->bb_page
, REQ_OP_READ
, 0, true))
1574 bbp
= (u64
*)page_address(rdev
->bb_page
);
1575 rdev
->badblocks
.shift
= sb
->bblog_shift
;
1576 for (i
= 0 ; i
< (sectors
<< (9-3)) ; i
++, bbp
++) {
1577 u64 bb
= le64_to_cpu(*bbp
);
1578 int count
= bb
& (0x3ff);
1579 u64 sector
= bb
>> 10;
1580 sector
<<= sb
->bblog_shift
;
1581 count
<<= sb
->bblog_shift
;
1584 if (badblocks_set(&rdev
->badblocks
, sector
, count
, 1))
1587 } else if (sb
->bblog_offset
!= 0)
1588 rdev
->badblocks
.shift
= 0;
1590 if ((le32_to_cpu(sb
->feature_map
) &
1591 (MD_FEATURE_PPL
| MD_FEATURE_MULTIPLE_PPLS
))) {
1592 rdev
->ppl
.offset
= (__s16
)le16_to_cpu(sb
->ppl
.offset
);
1593 rdev
->ppl
.size
= le16_to_cpu(sb
->ppl
.size
);
1594 rdev
->ppl
.sector
= rdev
->sb_start
+ rdev
->ppl
.offset
;
1601 struct mdp_superblock_1
*refsb
= page_address(refdev
->sb_page
);
1603 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16) != 0 ||
1604 sb
->level
!= refsb
->level
||
1605 sb
->layout
!= refsb
->layout
||
1606 sb
->chunksize
!= refsb
->chunksize
) {
1607 pr_warn("md: %s has strangely different superblock to %s\n",
1608 bdevname(rdev
->bdev
,b
),
1609 bdevname(refdev
->bdev
,b2
));
1612 ev1
= le64_to_cpu(sb
->events
);
1613 ev2
= le64_to_cpu(refsb
->events
);
1620 if (minor_version
) {
1621 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9);
1622 sectors
-= rdev
->data_offset
;
1624 sectors
= rdev
->sb_start
;
1625 if (sectors
< le64_to_cpu(sb
->data_size
))
1627 rdev
->sectors
= le64_to_cpu(sb
->data_size
);
1631 static int super_1_validate(struct mddev
*mddev
, struct md_rdev
*rdev
)
1633 struct mdp_superblock_1
*sb
= page_address(rdev
->sb_page
);
1634 __u64 ev1
= le64_to_cpu(sb
->events
);
1636 rdev
->raid_disk
= -1;
1637 clear_bit(Faulty
, &rdev
->flags
);
1638 clear_bit(In_sync
, &rdev
->flags
);
1639 clear_bit(Bitmap_sync
, &rdev
->flags
);
1640 clear_bit(WriteMostly
, &rdev
->flags
);
1642 if (mddev
->raid_disks
== 0) {
1643 mddev
->major_version
= 1;
1644 mddev
->patch_version
= 0;
1645 mddev
->external
= 0;
1646 mddev
->chunk_sectors
= le32_to_cpu(sb
->chunksize
);
1647 mddev
->ctime
= le64_to_cpu(sb
->ctime
);
1648 mddev
->utime
= le64_to_cpu(sb
->utime
);
1649 mddev
->level
= le32_to_cpu(sb
->level
);
1650 mddev
->clevel
[0] = 0;
1651 mddev
->layout
= le32_to_cpu(sb
->layout
);
1652 mddev
->raid_disks
= le32_to_cpu(sb
->raid_disks
);
1653 mddev
->dev_sectors
= le64_to_cpu(sb
->size
);
1654 mddev
->events
= ev1
;
1655 mddev
->bitmap_info
.offset
= 0;
1656 mddev
->bitmap_info
.space
= 0;
1657 /* Default location for bitmap is 1K after superblock
1658 * using 3K - total of 4K
1660 mddev
->bitmap_info
.default_offset
= 1024 >> 9;
1661 mddev
->bitmap_info
.default_space
= (4096-1024) >> 9;
1662 mddev
->reshape_backwards
= 0;
1664 mddev
->recovery_cp
= le64_to_cpu(sb
->resync_offset
);
1665 memcpy(mddev
->uuid
, sb
->set_uuid
, 16);
1667 mddev
->max_disks
= (4096-256)/2;
1669 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
) &&
1670 mddev
->bitmap_info
.file
== NULL
) {
1671 mddev
->bitmap_info
.offset
=
1672 (__s32
)le32_to_cpu(sb
->bitmap_offset
);
1673 /* Metadata doesn't record how much space is available.
1674 * For 1.0, we assume we can use up to the superblock
1675 * if before, else to 4K beyond superblock.
1676 * For others, assume no change is possible.
1678 if (mddev
->minor_version
> 0)
1679 mddev
->bitmap_info
.space
= 0;
1680 else if (mddev
->bitmap_info
.offset
> 0)
1681 mddev
->bitmap_info
.space
=
1682 8 - mddev
->bitmap_info
.offset
;
1684 mddev
->bitmap_info
.space
=
1685 -mddev
->bitmap_info
.offset
;
1688 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
1689 mddev
->reshape_position
= le64_to_cpu(sb
->reshape_position
);
1690 mddev
->delta_disks
= le32_to_cpu(sb
->delta_disks
);
1691 mddev
->new_level
= le32_to_cpu(sb
->new_level
);
1692 mddev
->new_layout
= le32_to_cpu(sb
->new_layout
);
1693 mddev
->new_chunk_sectors
= le32_to_cpu(sb
->new_chunk
);
1694 if (mddev
->delta_disks
< 0 ||
1695 (mddev
->delta_disks
== 0 &&
1696 (le32_to_cpu(sb
->feature_map
)
1697 & MD_FEATURE_RESHAPE_BACKWARDS
)))
1698 mddev
->reshape_backwards
= 1;
1700 mddev
->reshape_position
= MaxSector
;
1701 mddev
->delta_disks
= 0;
1702 mddev
->new_level
= mddev
->level
;
1703 mddev
->new_layout
= mddev
->layout
;
1704 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1707 if (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_JOURNAL
)
1708 set_bit(MD_HAS_JOURNAL
, &mddev
->flags
);
1710 if (le32_to_cpu(sb
->feature_map
) &
1711 (MD_FEATURE_PPL
| MD_FEATURE_MULTIPLE_PPLS
)) {
1712 if (le32_to_cpu(sb
->feature_map
) &
1713 (MD_FEATURE_BITMAP_OFFSET
| MD_FEATURE_JOURNAL
))
1715 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_PPL
) &&
1716 (le32_to_cpu(sb
->feature_map
) &
1717 MD_FEATURE_MULTIPLE_PPLS
))
1719 set_bit(MD_HAS_PPL
, &mddev
->flags
);
1721 } else if (mddev
->pers
== NULL
) {
1722 /* Insist of good event counter while assembling, except for
1723 * spares (which don't need an event count) */
1725 if (rdev
->desc_nr
>= 0 &&
1726 rdev
->desc_nr
< le32_to_cpu(sb
->max_dev
) &&
1727 (le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]) < MD_DISK_ROLE_MAX
||
1728 le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]) == MD_DISK_ROLE_JOURNAL
))
1729 if (ev1
< mddev
->events
)
1731 } else if (mddev
->bitmap
) {
1732 /* If adding to array with a bitmap, then we can accept an
1733 * older device, but not too old.
1735 if (ev1
< mddev
->bitmap
->events_cleared
)
1737 if (ev1
< mddev
->events
)
1738 set_bit(Bitmap_sync
, &rdev
->flags
);
1740 if (ev1
< mddev
->events
)
1741 /* just a hot-add of a new device, leave raid_disk at -1 */
1744 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1746 if (rdev
->desc_nr
< 0 ||
1747 rdev
->desc_nr
>= le32_to_cpu(sb
->max_dev
)) {
1748 role
= MD_DISK_ROLE_SPARE
;
1751 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
1753 case MD_DISK_ROLE_SPARE
: /* spare */
1755 case MD_DISK_ROLE_FAULTY
: /* faulty */
1756 set_bit(Faulty
, &rdev
->flags
);
1758 case MD_DISK_ROLE_JOURNAL
: /* journal device */
1759 if (!(le32_to_cpu(sb
->feature_map
) & MD_FEATURE_JOURNAL
)) {
1760 /* journal device without journal feature */
1761 pr_warn("md: journal device provided without journal feature, ignoring the device\n");
1764 set_bit(Journal
, &rdev
->flags
);
1765 rdev
->journal_tail
= le64_to_cpu(sb
->journal_tail
);
1766 rdev
->raid_disk
= 0;
1769 rdev
->saved_raid_disk
= role
;
1770 if ((le32_to_cpu(sb
->feature_map
) &
1771 MD_FEATURE_RECOVERY_OFFSET
)) {
1772 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
1773 if (!(le32_to_cpu(sb
->feature_map
) &
1774 MD_FEATURE_RECOVERY_BITMAP
))
1775 rdev
->saved_raid_disk
= -1;
1777 set_bit(In_sync
, &rdev
->flags
);
1778 rdev
->raid_disk
= role
;
1781 if (sb
->devflags
& WriteMostly1
)
1782 set_bit(WriteMostly
, &rdev
->flags
);
1783 if (sb
->devflags
& FailFast1
)
1784 set_bit(FailFast
, &rdev
->flags
);
1785 if (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_REPLACEMENT
)
1786 set_bit(Replacement
, &rdev
->flags
);
1787 } else /* MULTIPATH are always insync */
1788 set_bit(In_sync
, &rdev
->flags
);
1793 static void super_1_sync(struct mddev
*mddev
, struct md_rdev
*rdev
)
1795 struct mdp_superblock_1
*sb
;
1796 struct md_rdev
*rdev2
;
1798 /* make rdev->sb match mddev and rdev data. */
1800 sb
= page_address(rdev
->sb_page
);
1802 sb
->feature_map
= 0;
1804 sb
->recovery_offset
= cpu_to_le64(0);
1805 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
1807 sb
->utime
= cpu_to_le64((__u64
)mddev
->utime
);
1808 sb
->events
= cpu_to_le64(mddev
->events
);
1810 sb
->resync_offset
= cpu_to_le64(mddev
->recovery_cp
);
1811 else if (test_bit(MD_JOURNAL_CLEAN
, &mddev
->flags
))
1812 sb
->resync_offset
= cpu_to_le64(MaxSector
);
1814 sb
->resync_offset
= cpu_to_le64(0);
1816 sb
->cnt_corrected_read
= cpu_to_le32(atomic_read(&rdev
->corrected_errors
));
1818 sb
->raid_disks
= cpu_to_le32(mddev
->raid_disks
);
1819 sb
->size
= cpu_to_le64(mddev
->dev_sectors
);
1820 sb
->chunksize
= cpu_to_le32(mddev
->chunk_sectors
);
1821 sb
->level
= cpu_to_le32(mddev
->level
);
1822 sb
->layout
= cpu_to_le32(mddev
->layout
);
1823 if (test_bit(FailFast
, &rdev
->flags
))
1824 sb
->devflags
|= FailFast1
;
1826 sb
->devflags
&= ~FailFast1
;
1828 if (test_bit(WriteMostly
, &rdev
->flags
))
1829 sb
->devflags
|= WriteMostly1
;
1831 sb
->devflags
&= ~WriteMostly1
;
1832 sb
->data_offset
= cpu_to_le64(rdev
->data_offset
);
1833 sb
->data_size
= cpu_to_le64(rdev
->sectors
);
1835 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
) {
1836 sb
->bitmap_offset
= cpu_to_le32((__u32
)mddev
->bitmap_info
.offset
);
1837 sb
->feature_map
= cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
);
1840 if (rdev
->raid_disk
>= 0 && !test_bit(Journal
, &rdev
->flags
) &&
1841 !test_bit(In_sync
, &rdev
->flags
)) {
1843 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET
);
1844 sb
->recovery_offset
=
1845 cpu_to_le64(rdev
->recovery_offset
);
1846 if (rdev
->saved_raid_disk
>= 0 && mddev
->bitmap
)
1848 cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP
);
1850 /* Note: recovery_offset and journal_tail share space */
1851 if (test_bit(Journal
, &rdev
->flags
))
1852 sb
->journal_tail
= cpu_to_le64(rdev
->journal_tail
);
1853 if (test_bit(Replacement
, &rdev
->flags
))
1855 cpu_to_le32(MD_FEATURE_REPLACEMENT
);
1857 if (mddev
->reshape_position
!= MaxSector
) {
1858 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE
);
1859 sb
->reshape_position
= cpu_to_le64(mddev
->reshape_position
);
1860 sb
->new_layout
= cpu_to_le32(mddev
->new_layout
);
1861 sb
->delta_disks
= cpu_to_le32(mddev
->delta_disks
);
1862 sb
->new_level
= cpu_to_le32(mddev
->new_level
);
1863 sb
->new_chunk
= cpu_to_le32(mddev
->new_chunk_sectors
);
1864 if (mddev
->delta_disks
== 0 &&
1865 mddev
->reshape_backwards
)
1867 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS
);
1868 if (rdev
->new_data_offset
!= rdev
->data_offset
) {
1870 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET
);
1871 sb
->new_offset
= cpu_to_le32((__u32
)(rdev
->new_data_offset
1872 - rdev
->data_offset
));
1876 if (mddev_is_clustered(mddev
))
1877 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_CLUSTERED
);
1879 if (rdev
->badblocks
.count
== 0)
1880 /* Nothing to do for bad blocks*/ ;
1881 else if (sb
->bblog_offset
== 0)
1882 /* Cannot record bad blocks on this device */
1883 md_error(mddev
, rdev
);
1885 struct badblocks
*bb
= &rdev
->badblocks
;
1886 u64
*bbp
= (u64
*)page_address(rdev
->bb_page
);
1888 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_BAD_BLOCKS
);
1893 seq
= read_seqbegin(&bb
->lock
);
1895 memset(bbp
, 0xff, PAGE_SIZE
);
1897 for (i
= 0 ; i
< bb
->count
; i
++) {
1898 u64 internal_bb
= p
[i
];
1899 u64 store_bb
= ((BB_OFFSET(internal_bb
) << 10)
1900 | BB_LEN(internal_bb
));
1901 bbp
[i
] = cpu_to_le64(store_bb
);
1904 if (read_seqretry(&bb
->lock
, seq
))
1907 bb
->sector
= (rdev
->sb_start
+
1908 (int)le32_to_cpu(sb
->bblog_offset
));
1909 bb
->size
= le16_to_cpu(sb
->bblog_size
);
1914 rdev_for_each(rdev2
, mddev
)
1915 if (rdev2
->desc_nr
+1 > max_dev
)
1916 max_dev
= rdev2
->desc_nr
+1;
1918 if (max_dev
> le32_to_cpu(sb
->max_dev
)) {
1920 sb
->max_dev
= cpu_to_le32(max_dev
);
1921 rdev
->sb_size
= max_dev
* 2 + 256;
1922 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1923 if (rdev
->sb_size
& bmask
)
1924 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1926 max_dev
= le32_to_cpu(sb
->max_dev
);
1928 for (i
=0; i
<max_dev
;i
++)
1929 sb
->dev_roles
[i
] = cpu_to_le16(MD_DISK_ROLE_SPARE
);
1931 if (test_bit(MD_HAS_JOURNAL
, &mddev
->flags
))
1932 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_JOURNAL
);
1934 if (test_bit(MD_HAS_PPL
, &mddev
->flags
)) {
1935 if (test_bit(MD_HAS_MULTIPLE_PPLS
, &mddev
->flags
))
1937 cpu_to_le32(MD_FEATURE_MULTIPLE_PPLS
);
1939 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_PPL
);
1940 sb
->ppl
.offset
= cpu_to_le16(rdev
->ppl
.offset
);
1941 sb
->ppl
.size
= cpu_to_le16(rdev
->ppl
.size
);
1944 rdev_for_each(rdev2
, mddev
) {
1946 if (test_bit(Faulty
, &rdev2
->flags
))
1947 sb
->dev_roles
[i
] = cpu_to_le16(MD_DISK_ROLE_FAULTY
);
1948 else if (test_bit(In_sync
, &rdev2
->flags
))
1949 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1950 else if (test_bit(Journal
, &rdev2
->flags
))
1951 sb
->dev_roles
[i
] = cpu_to_le16(MD_DISK_ROLE_JOURNAL
);
1952 else if (rdev2
->raid_disk
>= 0)
1953 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1955 sb
->dev_roles
[i
] = cpu_to_le16(MD_DISK_ROLE_SPARE
);
1958 sb
->sb_csum
= calc_sb_1_csum(sb
);
1961 static unsigned long long
1962 super_1_rdev_size_change(struct md_rdev
*rdev
, sector_t num_sectors
)
1964 struct mdp_superblock_1
*sb
;
1965 sector_t max_sectors
;
1966 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1967 return 0; /* component must fit device */
1968 if (rdev
->data_offset
!= rdev
->new_data_offset
)
1969 return 0; /* too confusing */
1970 if (rdev
->sb_start
< rdev
->data_offset
) {
1971 /* minor versions 1 and 2; superblock before data */
1972 max_sectors
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1973 max_sectors
-= rdev
->data_offset
;
1974 if (!num_sectors
|| num_sectors
> max_sectors
)
1975 num_sectors
= max_sectors
;
1976 } else if (rdev
->mddev
->bitmap_info
.offset
) {
1977 /* minor version 0 with bitmap we can't move */
1980 /* minor version 0; superblock after data */
1982 sb_start
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) - 8*2;
1983 sb_start
&= ~(sector_t
)(4*2 - 1);
1984 max_sectors
= rdev
->sectors
+ sb_start
- rdev
->sb_start
;
1985 if (!num_sectors
|| num_sectors
> max_sectors
)
1986 num_sectors
= max_sectors
;
1987 rdev
->sb_start
= sb_start
;
1989 sb
= page_address(rdev
->sb_page
);
1990 sb
->data_size
= cpu_to_le64(num_sectors
);
1991 sb
->super_offset
= cpu_to_le64(rdev
->sb_start
);
1992 sb
->sb_csum
= calc_sb_1_csum(sb
);
1994 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1996 } while (md_super_wait(rdev
->mddev
) < 0);
2002 super_1_allow_new_offset(struct md_rdev
*rdev
,
2003 unsigned long long new_offset
)
2005 /* All necessary checks on new >= old have been done */
2006 struct bitmap
*bitmap
;
2007 if (new_offset
>= rdev
->data_offset
)
2010 /* with 1.0 metadata, there is no metadata to tread on
2011 * so we can always move back */
2012 if (rdev
->mddev
->minor_version
== 0)
2015 /* otherwise we must be sure not to step on
2016 * any metadata, so stay:
2017 * 36K beyond start of superblock
2018 * beyond end of badblocks
2019 * beyond write-intent bitmap
2021 if (rdev
->sb_start
+ (32+4)*2 > new_offset
)
2023 bitmap
= rdev
->mddev
->bitmap
;
2024 if (bitmap
&& !rdev
->mddev
->bitmap_info
.file
&&
2025 rdev
->sb_start
+ rdev
->mddev
->bitmap_info
.offset
+
2026 bitmap
->storage
.file_pages
* (PAGE_SIZE
>>9) > new_offset
)
2028 if (rdev
->badblocks
.sector
+ rdev
->badblocks
.size
> new_offset
)
2034 static struct super_type super_types
[] = {
2037 .owner
= THIS_MODULE
,
2038 .load_super
= super_90_load
,
2039 .validate_super
= super_90_validate
,
2040 .sync_super
= super_90_sync
,
2041 .rdev_size_change
= super_90_rdev_size_change
,
2042 .allow_new_offset
= super_90_allow_new_offset
,
2046 .owner
= THIS_MODULE
,
2047 .load_super
= super_1_load
,
2048 .validate_super
= super_1_validate
,
2049 .sync_super
= super_1_sync
,
2050 .rdev_size_change
= super_1_rdev_size_change
,
2051 .allow_new_offset
= super_1_allow_new_offset
,
2055 static void sync_super(struct mddev
*mddev
, struct md_rdev
*rdev
)
2057 if (mddev
->sync_super
) {
2058 mddev
->sync_super(mddev
, rdev
);
2062 BUG_ON(mddev
->major_version
>= ARRAY_SIZE(super_types
));
2064 super_types
[mddev
->major_version
].sync_super(mddev
, rdev
);
2067 static int match_mddev_units(struct mddev
*mddev1
, struct mddev
*mddev2
)
2069 struct md_rdev
*rdev
, *rdev2
;
2072 rdev_for_each_rcu(rdev
, mddev1
) {
2073 if (test_bit(Faulty
, &rdev
->flags
) ||
2074 test_bit(Journal
, &rdev
->flags
) ||
2075 rdev
->raid_disk
== -1)
2077 rdev_for_each_rcu(rdev2
, mddev2
) {
2078 if (test_bit(Faulty
, &rdev2
->flags
) ||
2079 test_bit(Journal
, &rdev2
->flags
) ||
2080 rdev2
->raid_disk
== -1)
2082 if (rdev
->bdev
->bd_contains
==
2083 rdev2
->bdev
->bd_contains
) {
2093 static LIST_HEAD(pending_raid_disks
);
2096 * Try to register data integrity profile for an mddev
2098 * This is called when an array is started and after a disk has been kicked
2099 * from the array. It only succeeds if all working and active component devices
2100 * are integrity capable with matching profiles.
2102 int md_integrity_register(struct mddev
*mddev
)
2104 struct md_rdev
*rdev
, *reference
= NULL
;
2106 if (list_empty(&mddev
->disks
))
2107 return 0; /* nothing to do */
2108 if (!mddev
->gendisk
|| blk_get_integrity(mddev
->gendisk
))
2109 return 0; /* shouldn't register, or already is */
2110 rdev_for_each(rdev
, mddev
) {
2111 /* skip spares and non-functional disks */
2112 if (test_bit(Faulty
, &rdev
->flags
))
2114 if (rdev
->raid_disk
< 0)
2117 /* Use the first rdev as the reference */
2121 /* does this rdev's profile match the reference profile? */
2122 if (blk_integrity_compare(reference
->bdev
->bd_disk
,
2123 rdev
->bdev
->bd_disk
) < 0)
2126 if (!reference
|| !bdev_get_integrity(reference
->bdev
))
2129 * All component devices are integrity capable and have matching
2130 * profiles, register the common profile for the md device.
2132 blk_integrity_register(mddev
->gendisk
,
2133 bdev_get_integrity(reference
->bdev
));
2135 pr_debug("md: data integrity enabled on %s\n", mdname(mddev
));
2136 if (bioset_integrity_create(&mddev
->bio_set
, BIO_POOL_SIZE
)) {
2137 pr_err("md: failed to create integrity pool for %s\n",
2143 EXPORT_SYMBOL(md_integrity_register
);
2146 * Attempt to add an rdev, but only if it is consistent with the current
2149 int md_integrity_add_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
2151 struct blk_integrity
*bi_rdev
;
2152 struct blk_integrity
*bi_mddev
;
2153 char name
[BDEVNAME_SIZE
];
2155 if (!mddev
->gendisk
)
2158 bi_rdev
= bdev_get_integrity(rdev
->bdev
);
2159 bi_mddev
= blk_get_integrity(mddev
->gendisk
);
2161 if (!bi_mddev
) /* nothing to do */
2164 if (blk_integrity_compare(mddev
->gendisk
, rdev
->bdev
->bd_disk
) != 0) {
2165 pr_err("%s: incompatible integrity profile for %s\n",
2166 mdname(mddev
), bdevname(rdev
->bdev
, name
));
2172 EXPORT_SYMBOL(md_integrity_add_rdev
);
2174 static int bind_rdev_to_array(struct md_rdev
*rdev
, struct mddev
*mddev
)
2176 char b
[BDEVNAME_SIZE
];
2180 /* prevent duplicates */
2181 if (find_rdev(mddev
, rdev
->bdev
->bd_dev
))
2184 if ((bdev_read_only(rdev
->bdev
) || bdev_read_only(rdev
->meta_bdev
)) &&
2188 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2189 if (!test_bit(Journal
, &rdev
->flags
) &&
2191 (mddev
->dev_sectors
== 0 || rdev
->sectors
< mddev
->dev_sectors
)) {
2193 /* Cannot change size, so fail
2194 * If mddev->level <= 0, then we don't care
2195 * about aligning sizes (e.g. linear)
2197 if (mddev
->level
> 0)
2200 mddev
->dev_sectors
= rdev
->sectors
;
2203 /* Verify rdev->desc_nr is unique.
2204 * If it is -1, assign a free number, else
2205 * check number is not in use
2208 if (rdev
->desc_nr
< 0) {
2211 choice
= mddev
->raid_disks
;
2212 while (md_find_rdev_nr_rcu(mddev
, choice
))
2214 rdev
->desc_nr
= choice
;
2216 if (md_find_rdev_nr_rcu(mddev
, rdev
->desc_nr
)) {
2222 if (!test_bit(Journal
, &rdev
->flags
) &&
2223 mddev
->max_disks
&& rdev
->desc_nr
>= mddev
->max_disks
) {
2224 pr_warn("md: %s: array is limited to %d devices\n",
2225 mdname(mddev
), mddev
->max_disks
);
2228 bdevname(rdev
->bdev
,b
);
2229 strreplace(b
, '/', '!');
2231 rdev
->mddev
= mddev
;
2232 pr_debug("md: bind<%s>\n", b
);
2234 if ((err
= kobject_add(&rdev
->kobj
, &mddev
->kobj
, "dev-%s", b
)))
2237 ko
= &part_to_dev(rdev
->bdev
->bd_part
)->kobj
;
2238 if (sysfs_create_link(&rdev
->kobj
, ko
, "block"))
2239 /* failure here is OK */;
2240 rdev
->sysfs_state
= sysfs_get_dirent_safe(rdev
->kobj
.sd
, "state");
2242 list_add_rcu(&rdev
->same_set
, &mddev
->disks
);
2243 bd_link_disk_holder(rdev
->bdev
, mddev
->gendisk
);
2245 /* May as well allow recovery to be retried once */
2246 mddev
->recovery_disabled
++;
2251 pr_warn("md: failed to register dev-%s for %s\n",
2256 static void md_delayed_delete(struct work_struct
*ws
)
2258 struct md_rdev
*rdev
= container_of(ws
, struct md_rdev
, del_work
);
2259 kobject_del(&rdev
->kobj
);
2260 kobject_put(&rdev
->kobj
);
2263 static void unbind_rdev_from_array(struct md_rdev
*rdev
)
2265 char b
[BDEVNAME_SIZE
];
2267 bd_unlink_disk_holder(rdev
->bdev
, rdev
->mddev
->gendisk
);
2268 list_del_rcu(&rdev
->same_set
);
2269 pr_debug("md: unbind<%s>\n", bdevname(rdev
->bdev
,b
));
2271 sysfs_remove_link(&rdev
->kobj
, "block");
2272 sysfs_put(rdev
->sysfs_state
);
2273 rdev
->sysfs_state
= NULL
;
2274 rdev
->badblocks
.count
= 0;
2275 /* We need to delay this, otherwise we can deadlock when
2276 * writing to 'remove' to "dev/state". We also need
2277 * to delay it due to rcu usage.
2280 INIT_WORK(&rdev
->del_work
, md_delayed_delete
);
2281 kobject_get(&rdev
->kobj
);
2282 queue_work(md_misc_wq
, &rdev
->del_work
);
2286 * prevent the device from being mounted, repartitioned or
2287 * otherwise reused by a RAID array (or any other kernel
2288 * subsystem), by bd_claiming the device.
2290 static int lock_rdev(struct md_rdev
*rdev
, dev_t dev
, int shared
)
2293 struct block_device
*bdev
;
2294 char b
[BDEVNAME_SIZE
];
2296 bdev
= blkdev_get_by_dev(dev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
,
2297 shared
? (struct md_rdev
*)lock_rdev
: rdev
);
2299 pr_warn("md: could not open %s.\n", __bdevname(dev
, b
));
2300 return PTR_ERR(bdev
);
2306 static void unlock_rdev(struct md_rdev
*rdev
)
2308 struct block_device
*bdev
= rdev
->bdev
;
2310 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
);
2313 void md_autodetect_dev(dev_t dev
);
2315 static void export_rdev(struct md_rdev
*rdev
)
2317 char b
[BDEVNAME_SIZE
];
2319 pr_debug("md: export_rdev(%s)\n", bdevname(rdev
->bdev
,b
));
2320 md_rdev_clear(rdev
);
2322 if (test_bit(AutoDetected
, &rdev
->flags
))
2323 md_autodetect_dev(rdev
->bdev
->bd_dev
);
2326 kobject_put(&rdev
->kobj
);
2329 void md_kick_rdev_from_array(struct md_rdev
*rdev
)
2331 unbind_rdev_from_array(rdev
);
2334 EXPORT_SYMBOL_GPL(md_kick_rdev_from_array
);
2336 static void export_array(struct mddev
*mddev
)
2338 struct md_rdev
*rdev
;
2340 while (!list_empty(&mddev
->disks
)) {
2341 rdev
= list_first_entry(&mddev
->disks
, struct md_rdev
,
2343 md_kick_rdev_from_array(rdev
);
2345 mddev
->raid_disks
= 0;
2346 mddev
->major_version
= 0;
2349 static bool set_in_sync(struct mddev
*mddev
)
2351 lockdep_assert_held(&mddev
->lock
);
2352 if (!mddev
->in_sync
) {
2353 mddev
->sync_checkers
++;
2354 spin_unlock(&mddev
->lock
);
2355 percpu_ref_switch_to_atomic_sync(&mddev
->writes_pending
);
2356 spin_lock(&mddev
->lock
);
2357 if (!mddev
->in_sync
&&
2358 percpu_ref_is_zero(&mddev
->writes_pending
)) {
2361 * Ensure ->in_sync is visible before we clear
2365 set_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
2366 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
2368 if (--mddev
->sync_checkers
== 0)
2369 percpu_ref_switch_to_percpu(&mddev
->writes_pending
);
2371 if (mddev
->safemode
== 1)
2372 mddev
->safemode
= 0;
2373 return mddev
->in_sync
;
2376 static void sync_sbs(struct mddev
*mddev
, int nospares
)
2378 /* Update each superblock (in-memory image), but
2379 * if we are allowed to, skip spares which already
2380 * have the right event counter, or have one earlier
2381 * (which would mean they aren't being marked as dirty
2382 * with the rest of the array)
2384 struct md_rdev
*rdev
;
2385 rdev_for_each(rdev
, mddev
) {
2386 if (rdev
->sb_events
== mddev
->events
||
2388 rdev
->raid_disk
< 0 &&
2389 rdev
->sb_events
+1 == mddev
->events
)) {
2390 /* Don't update this superblock */
2391 rdev
->sb_loaded
= 2;
2393 sync_super(mddev
, rdev
);
2394 rdev
->sb_loaded
= 1;
2399 static bool does_sb_need_changing(struct mddev
*mddev
)
2401 struct md_rdev
*rdev
;
2402 struct mdp_superblock_1
*sb
;
2405 /* Find a good rdev */
2406 rdev_for_each(rdev
, mddev
)
2407 if ((rdev
->raid_disk
>= 0) && !test_bit(Faulty
, &rdev
->flags
))
2410 /* No good device found. */
2414 sb
= page_address(rdev
->sb_page
);
2415 /* Check if a device has become faulty or a spare become active */
2416 rdev_for_each(rdev
, mddev
) {
2417 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
2418 /* Device activated? */
2419 if (role
== 0xffff && rdev
->raid_disk
>=0 &&
2420 !test_bit(Faulty
, &rdev
->flags
))
2422 /* Device turned faulty? */
2423 if (test_bit(Faulty
, &rdev
->flags
) && (role
< 0xfffd))
2427 /* Check if any mddev parameters have changed */
2428 if ((mddev
->dev_sectors
!= le64_to_cpu(sb
->size
)) ||
2429 (mddev
->reshape_position
!= le64_to_cpu(sb
->reshape_position
)) ||
2430 (mddev
->layout
!= le32_to_cpu(sb
->layout
)) ||
2431 (mddev
->raid_disks
!= le32_to_cpu(sb
->raid_disks
)) ||
2432 (mddev
->chunk_sectors
!= le32_to_cpu(sb
->chunksize
)))
2438 void md_update_sb(struct mddev
*mddev
, int force_change
)
2440 struct md_rdev
*rdev
;
2443 int any_badblocks_changed
= 0;
2448 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
2453 if (mddev_is_clustered(mddev
)) {
2454 if (test_and_clear_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
))
2456 if (test_and_clear_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
))
2458 ret
= md_cluster_ops
->metadata_update_start(mddev
);
2459 /* Has someone else has updated the sb */
2460 if (!does_sb_need_changing(mddev
)) {
2462 md_cluster_ops
->metadata_update_cancel(mddev
);
2463 bit_clear_unless(&mddev
->sb_flags
, BIT(MD_SB_CHANGE_PENDING
),
2464 BIT(MD_SB_CHANGE_DEVS
) |
2465 BIT(MD_SB_CHANGE_CLEAN
));
2471 * First make sure individual recovery_offsets are correct
2472 * curr_resync_completed can only be used during recovery.
2473 * During reshape/resync it might use array-addresses rather
2474 * that device addresses.
2476 rdev_for_each(rdev
, mddev
) {
2477 if (rdev
->raid_disk
>= 0 &&
2478 mddev
->delta_disks
>= 0 &&
2479 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
2480 test_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
) &&
2481 !test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
2482 !test_bit(Journal
, &rdev
->flags
) &&
2483 !test_bit(In_sync
, &rdev
->flags
) &&
2484 mddev
->curr_resync_completed
> rdev
->recovery_offset
)
2485 rdev
->recovery_offset
= mddev
->curr_resync_completed
;
2488 if (!mddev
->persistent
) {
2489 clear_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
2490 clear_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
2491 if (!mddev
->external
) {
2492 clear_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
2493 rdev_for_each(rdev
, mddev
) {
2494 if (rdev
->badblocks
.changed
) {
2495 rdev
->badblocks
.changed
= 0;
2496 ack_all_badblocks(&rdev
->badblocks
);
2497 md_error(mddev
, rdev
);
2499 clear_bit(Blocked
, &rdev
->flags
);
2500 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2501 wake_up(&rdev
->blocked_wait
);
2504 wake_up(&mddev
->sb_wait
);
2508 spin_lock(&mddev
->lock
);
2510 mddev
->utime
= ktime_get_real_seconds();
2512 if (test_and_clear_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
))
2514 if (test_and_clear_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
))
2515 /* just a clean<-> dirty transition, possibly leave spares alone,
2516 * though if events isn't the right even/odd, we will have to do
2522 if (mddev
->degraded
)
2523 /* If the array is degraded, then skipping spares is both
2524 * dangerous and fairly pointless.
2525 * Dangerous because a device that was removed from the array
2526 * might have a event_count that still looks up-to-date,
2527 * so it can be re-added without a resync.
2528 * Pointless because if there are any spares to skip,
2529 * then a recovery will happen and soon that array won't
2530 * be degraded any more and the spare can go back to sleep then.
2534 sync_req
= mddev
->in_sync
;
2536 /* If this is just a dirty<->clean transition, and the array is clean
2537 * and 'events' is odd, we can roll back to the previous clean state */
2539 && (mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
2540 && mddev
->can_decrease_events
2541 && mddev
->events
!= 1) {
2543 mddev
->can_decrease_events
= 0;
2545 /* otherwise we have to go forward and ... */
2547 mddev
->can_decrease_events
= nospares
;
2551 * This 64-bit counter should never wrap.
2552 * Either we are in around ~1 trillion A.C., assuming
2553 * 1 reboot per second, or we have a bug...
2555 WARN_ON(mddev
->events
== 0);
2557 rdev_for_each(rdev
, mddev
) {
2558 if (rdev
->badblocks
.changed
)
2559 any_badblocks_changed
++;
2560 if (test_bit(Faulty
, &rdev
->flags
))
2561 set_bit(FaultRecorded
, &rdev
->flags
);
2564 sync_sbs(mddev
, nospares
);
2565 spin_unlock(&mddev
->lock
);
2567 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2568 mdname(mddev
), mddev
->in_sync
);
2571 blk_add_trace_msg(mddev
->queue
, "md md_update_sb");
2573 md_bitmap_update_sb(mddev
->bitmap
);
2574 rdev_for_each(rdev
, mddev
) {
2575 char b
[BDEVNAME_SIZE
];
2577 if (rdev
->sb_loaded
!= 1)
2578 continue; /* no noise on spare devices */
2580 if (!test_bit(Faulty
, &rdev
->flags
)) {
2581 md_super_write(mddev
,rdev
,
2582 rdev
->sb_start
, rdev
->sb_size
,
2584 pr_debug("md: (write) %s's sb offset: %llu\n",
2585 bdevname(rdev
->bdev
, b
),
2586 (unsigned long long)rdev
->sb_start
);
2587 rdev
->sb_events
= mddev
->events
;
2588 if (rdev
->badblocks
.size
) {
2589 md_super_write(mddev
, rdev
,
2590 rdev
->badblocks
.sector
,
2591 rdev
->badblocks
.size
<< 9,
2593 rdev
->badblocks
.size
= 0;
2597 pr_debug("md: %s (skipping faulty)\n",
2598 bdevname(rdev
->bdev
, b
));
2600 if (mddev
->level
== LEVEL_MULTIPATH
)
2601 /* only need to write one superblock... */
2604 if (md_super_wait(mddev
) < 0)
2606 /* if there was a failure, MD_SB_CHANGE_DEVS was set, and we re-write super */
2608 if (mddev_is_clustered(mddev
) && ret
== 0)
2609 md_cluster_ops
->metadata_update_finish(mddev
);
2611 if (mddev
->in_sync
!= sync_req
||
2612 !bit_clear_unless(&mddev
->sb_flags
, BIT(MD_SB_CHANGE_PENDING
),
2613 BIT(MD_SB_CHANGE_DEVS
) | BIT(MD_SB_CHANGE_CLEAN
)))
2614 /* have to write it out again */
2616 wake_up(&mddev
->sb_wait
);
2617 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
2618 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
2620 rdev_for_each(rdev
, mddev
) {
2621 if (test_and_clear_bit(FaultRecorded
, &rdev
->flags
))
2622 clear_bit(Blocked
, &rdev
->flags
);
2624 if (any_badblocks_changed
)
2625 ack_all_badblocks(&rdev
->badblocks
);
2626 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2627 wake_up(&rdev
->blocked_wait
);
2630 EXPORT_SYMBOL(md_update_sb
);
2632 static int add_bound_rdev(struct md_rdev
*rdev
)
2634 struct mddev
*mddev
= rdev
->mddev
;
2636 bool add_journal
= test_bit(Journal
, &rdev
->flags
);
2638 if (!mddev
->pers
->hot_remove_disk
|| add_journal
) {
2639 /* If there is hot_add_disk but no hot_remove_disk
2640 * then added disks for geometry changes,
2641 * and should be added immediately.
2643 super_types
[mddev
->major_version
].
2644 validate_super(mddev
, rdev
);
2646 mddev_suspend(mddev
);
2647 err
= mddev
->pers
->hot_add_disk(mddev
, rdev
);
2649 mddev_resume(mddev
);
2651 md_kick_rdev_from_array(rdev
);
2655 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2657 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
2658 if (mddev
->degraded
)
2659 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
2660 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
2661 md_new_event(mddev
);
2662 md_wakeup_thread(mddev
->thread
);
2666 /* words written to sysfs files may, or may not, be \n terminated.
2667 * We want to accept with case. For this we use cmd_match.
2669 static int cmd_match(const char *cmd
, const char *str
)
2671 /* See if cmd, written into a sysfs file, matches
2672 * str. They must either be the same, or cmd can
2673 * have a trailing newline
2675 while (*cmd
&& *str
&& *cmd
== *str
) {
2686 struct rdev_sysfs_entry
{
2687 struct attribute attr
;
2688 ssize_t (*show
)(struct md_rdev
*, char *);
2689 ssize_t (*store
)(struct md_rdev
*, const char *, size_t);
2693 state_show(struct md_rdev
*rdev
, char *page
)
2697 unsigned long flags
= READ_ONCE(rdev
->flags
);
2699 if (test_bit(Faulty
, &flags
) ||
2700 (!test_bit(ExternalBbl
, &flags
) &&
2701 rdev
->badblocks
.unacked_exist
))
2702 len
+= sprintf(page
+len
, "faulty%s", sep
);
2703 if (test_bit(In_sync
, &flags
))
2704 len
+= sprintf(page
+len
, "in_sync%s", sep
);
2705 if (test_bit(Journal
, &flags
))
2706 len
+= sprintf(page
+len
, "journal%s", sep
);
2707 if (test_bit(WriteMostly
, &flags
))
2708 len
+= sprintf(page
+len
, "write_mostly%s", sep
);
2709 if (test_bit(Blocked
, &flags
) ||
2710 (rdev
->badblocks
.unacked_exist
2711 && !test_bit(Faulty
, &flags
)))
2712 len
+= sprintf(page
+len
, "blocked%s", sep
);
2713 if (!test_bit(Faulty
, &flags
) &&
2714 !test_bit(Journal
, &flags
) &&
2715 !test_bit(In_sync
, &flags
))
2716 len
+= sprintf(page
+len
, "spare%s", sep
);
2717 if (test_bit(WriteErrorSeen
, &flags
))
2718 len
+= sprintf(page
+len
, "write_error%s", sep
);
2719 if (test_bit(WantReplacement
, &flags
))
2720 len
+= sprintf(page
+len
, "want_replacement%s", sep
);
2721 if (test_bit(Replacement
, &flags
))
2722 len
+= sprintf(page
+len
, "replacement%s", sep
);
2723 if (test_bit(ExternalBbl
, &flags
))
2724 len
+= sprintf(page
+len
, "external_bbl%s", sep
);
2725 if (test_bit(FailFast
, &flags
))
2726 len
+= sprintf(page
+len
, "failfast%s", sep
);
2731 return len
+sprintf(page
+len
, "\n");
2735 state_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2738 * faulty - simulates an error
2739 * remove - disconnects the device
2740 * writemostly - sets write_mostly
2741 * -writemostly - clears write_mostly
2742 * blocked - sets the Blocked flags
2743 * -blocked - clears the Blocked and possibly simulates an error
2744 * insync - sets Insync providing device isn't active
2745 * -insync - clear Insync for a device with a slot assigned,
2746 * so that it gets rebuilt based on bitmap
2747 * write_error - sets WriteErrorSeen
2748 * -write_error - clears WriteErrorSeen
2749 * {,-}failfast - set/clear FailFast
2752 if (cmd_match(buf
, "faulty") && rdev
->mddev
->pers
) {
2753 md_error(rdev
->mddev
, rdev
);
2754 if (test_bit(Faulty
, &rdev
->flags
))
2758 } else if (cmd_match(buf
, "remove")) {
2759 if (rdev
->mddev
->pers
) {
2760 clear_bit(Blocked
, &rdev
->flags
);
2761 remove_and_add_spares(rdev
->mddev
, rdev
);
2763 if (rdev
->raid_disk
>= 0)
2766 struct mddev
*mddev
= rdev
->mddev
;
2768 if (mddev_is_clustered(mddev
))
2769 err
= md_cluster_ops
->remove_disk(mddev
, rdev
);
2772 md_kick_rdev_from_array(rdev
);
2774 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
2775 md_wakeup_thread(mddev
->thread
);
2777 md_new_event(mddev
);
2780 } else if (cmd_match(buf
, "writemostly")) {
2781 set_bit(WriteMostly
, &rdev
->flags
);
2783 } else if (cmd_match(buf
, "-writemostly")) {
2784 clear_bit(WriteMostly
, &rdev
->flags
);
2786 } else if (cmd_match(buf
, "blocked")) {
2787 set_bit(Blocked
, &rdev
->flags
);
2789 } else if (cmd_match(buf
, "-blocked")) {
2790 if (!test_bit(Faulty
, &rdev
->flags
) &&
2791 !test_bit(ExternalBbl
, &rdev
->flags
) &&
2792 rdev
->badblocks
.unacked_exist
) {
2793 /* metadata handler doesn't understand badblocks,
2794 * so we need to fail the device
2796 md_error(rdev
->mddev
, rdev
);
2798 clear_bit(Blocked
, &rdev
->flags
);
2799 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2800 wake_up(&rdev
->blocked_wait
);
2801 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2802 md_wakeup_thread(rdev
->mddev
->thread
);
2805 } else if (cmd_match(buf
, "insync") && rdev
->raid_disk
== -1) {
2806 set_bit(In_sync
, &rdev
->flags
);
2808 } else if (cmd_match(buf
, "failfast")) {
2809 set_bit(FailFast
, &rdev
->flags
);
2811 } else if (cmd_match(buf
, "-failfast")) {
2812 clear_bit(FailFast
, &rdev
->flags
);
2814 } else if (cmd_match(buf
, "-insync") && rdev
->raid_disk
>= 0 &&
2815 !test_bit(Journal
, &rdev
->flags
)) {
2816 if (rdev
->mddev
->pers
== NULL
) {
2817 clear_bit(In_sync
, &rdev
->flags
);
2818 rdev
->saved_raid_disk
= rdev
->raid_disk
;
2819 rdev
->raid_disk
= -1;
2822 } else if (cmd_match(buf
, "write_error")) {
2823 set_bit(WriteErrorSeen
, &rdev
->flags
);
2825 } else if (cmd_match(buf
, "-write_error")) {
2826 clear_bit(WriteErrorSeen
, &rdev
->flags
);
2828 } else if (cmd_match(buf
, "want_replacement")) {
2829 /* Any non-spare device that is not a replacement can
2830 * become want_replacement at any time, but we then need to
2831 * check if recovery is needed.
2833 if (rdev
->raid_disk
>= 0 &&
2834 !test_bit(Journal
, &rdev
->flags
) &&
2835 !test_bit(Replacement
, &rdev
->flags
))
2836 set_bit(WantReplacement
, &rdev
->flags
);
2837 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2838 md_wakeup_thread(rdev
->mddev
->thread
);
2840 } else if (cmd_match(buf
, "-want_replacement")) {
2841 /* Clearing 'want_replacement' is always allowed.
2842 * Once replacements starts it is too late though.
2845 clear_bit(WantReplacement
, &rdev
->flags
);
2846 } else if (cmd_match(buf
, "replacement")) {
2847 /* Can only set a device as a replacement when array has not
2848 * yet been started. Once running, replacement is automatic
2849 * from spares, or by assigning 'slot'.
2851 if (rdev
->mddev
->pers
)
2854 set_bit(Replacement
, &rdev
->flags
);
2857 } else if (cmd_match(buf
, "-replacement")) {
2858 /* Similarly, can only clear Replacement before start */
2859 if (rdev
->mddev
->pers
)
2862 clear_bit(Replacement
, &rdev
->flags
);
2865 } else if (cmd_match(buf
, "re-add")) {
2866 if (test_bit(Faulty
, &rdev
->flags
) && (rdev
->raid_disk
== -1) &&
2867 rdev
->saved_raid_disk
>= 0) {
2868 /* clear_bit is performed _after_ all the devices
2869 * have their local Faulty bit cleared. If any writes
2870 * happen in the meantime in the local node, they
2871 * will land in the local bitmap, which will be synced
2872 * by this node eventually
2874 if (!mddev_is_clustered(rdev
->mddev
) ||
2875 (err
= md_cluster_ops
->gather_bitmaps(rdev
)) == 0) {
2876 clear_bit(Faulty
, &rdev
->flags
);
2877 err
= add_bound_rdev(rdev
);
2881 } else if (cmd_match(buf
, "external_bbl") && (rdev
->mddev
->external
)) {
2882 set_bit(ExternalBbl
, &rdev
->flags
);
2883 rdev
->badblocks
.shift
= 0;
2885 } else if (cmd_match(buf
, "-external_bbl") && (rdev
->mddev
->external
)) {
2886 clear_bit(ExternalBbl
, &rdev
->flags
);
2890 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2891 return err
? err
: len
;
2893 static struct rdev_sysfs_entry rdev_state
=
2894 __ATTR_PREALLOC(state
, S_IRUGO
|S_IWUSR
, state_show
, state_store
);
2897 errors_show(struct md_rdev
*rdev
, char *page
)
2899 return sprintf(page
, "%d\n", atomic_read(&rdev
->corrected_errors
));
2903 errors_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2908 rv
= kstrtouint(buf
, 10, &n
);
2911 atomic_set(&rdev
->corrected_errors
, n
);
2914 static struct rdev_sysfs_entry rdev_errors
=
2915 __ATTR(errors
, S_IRUGO
|S_IWUSR
, errors_show
, errors_store
);
2918 slot_show(struct md_rdev
*rdev
, char *page
)
2920 if (test_bit(Journal
, &rdev
->flags
))
2921 return sprintf(page
, "journal\n");
2922 else if (rdev
->raid_disk
< 0)
2923 return sprintf(page
, "none\n");
2925 return sprintf(page
, "%d\n", rdev
->raid_disk
);
2929 slot_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2934 if (test_bit(Journal
, &rdev
->flags
))
2936 if (strncmp(buf
, "none", 4)==0)
2939 err
= kstrtouint(buf
, 10, (unsigned int *)&slot
);
2943 if (rdev
->mddev
->pers
&& slot
== -1) {
2944 /* Setting 'slot' on an active array requires also
2945 * updating the 'rd%d' link, and communicating
2946 * with the personality with ->hot_*_disk.
2947 * For now we only support removing
2948 * failed/spare devices. This normally happens automatically,
2949 * but not when the metadata is externally managed.
2951 if (rdev
->raid_disk
== -1)
2953 /* personality does all needed checks */
2954 if (rdev
->mddev
->pers
->hot_remove_disk
== NULL
)
2956 clear_bit(Blocked
, &rdev
->flags
);
2957 remove_and_add_spares(rdev
->mddev
, rdev
);
2958 if (rdev
->raid_disk
>= 0)
2960 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2961 md_wakeup_thread(rdev
->mddev
->thread
);
2962 } else if (rdev
->mddev
->pers
) {
2963 /* Activating a spare .. or possibly reactivating
2964 * if we ever get bitmaps working here.
2968 if (rdev
->raid_disk
!= -1)
2971 if (test_bit(MD_RECOVERY_RUNNING
, &rdev
->mddev
->recovery
))
2974 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
2977 if (slot
>= rdev
->mddev
->raid_disks
&&
2978 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
2981 rdev
->raid_disk
= slot
;
2982 if (test_bit(In_sync
, &rdev
->flags
))
2983 rdev
->saved_raid_disk
= slot
;
2985 rdev
->saved_raid_disk
= -1;
2986 clear_bit(In_sync
, &rdev
->flags
);
2987 clear_bit(Bitmap_sync
, &rdev
->flags
);
2988 err
= rdev
->mddev
->pers
->
2989 hot_add_disk(rdev
->mddev
, rdev
);
2991 rdev
->raid_disk
= -1;
2994 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2995 if (sysfs_link_rdev(rdev
->mddev
, rdev
))
2996 /* failure here is OK */;
2997 /* don't wakeup anyone, leave that to userspace. */
2999 if (slot
>= rdev
->mddev
->raid_disks
&&
3000 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
3002 rdev
->raid_disk
= slot
;
3003 /* assume it is working */
3004 clear_bit(Faulty
, &rdev
->flags
);
3005 clear_bit(WriteMostly
, &rdev
->flags
);
3006 set_bit(In_sync
, &rdev
->flags
);
3007 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
3012 static struct rdev_sysfs_entry rdev_slot
=
3013 __ATTR(slot
, S_IRUGO
|S_IWUSR
, slot_show
, slot_store
);
3016 offset_show(struct md_rdev
*rdev
, char *page
)
3018 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->data_offset
);
3022 offset_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3024 unsigned long long offset
;
3025 if (kstrtoull(buf
, 10, &offset
) < 0)
3027 if (rdev
->mddev
->pers
&& rdev
->raid_disk
>= 0)
3029 if (rdev
->sectors
&& rdev
->mddev
->external
)
3030 /* Must set offset before size, so overlap checks
3033 rdev
->data_offset
= offset
;
3034 rdev
->new_data_offset
= offset
;
3038 static struct rdev_sysfs_entry rdev_offset
=
3039 __ATTR(offset
, S_IRUGO
|S_IWUSR
, offset_show
, offset_store
);
3041 static ssize_t
new_offset_show(struct md_rdev
*rdev
, char *page
)
3043 return sprintf(page
, "%llu\n",
3044 (unsigned long long)rdev
->new_data_offset
);
3047 static ssize_t
new_offset_store(struct md_rdev
*rdev
,
3048 const char *buf
, size_t len
)
3050 unsigned long long new_offset
;
3051 struct mddev
*mddev
= rdev
->mddev
;
3053 if (kstrtoull(buf
, 10, &new_offset
) < 0)
3056 if (mddev
->sync_thread
||
3057 test_bit(MD_RECOVERY_RUNNING
,&mddev
->recovery
))
3059 if (new_offset
== rdev
->data_offset
)
3060 /* reset is always permitted */
3062 else if (new_offset
> rdev
->data_offset
) {
3063 /* must not push array size beyond rdev_sectors */
3064 if (new_offset
- rdev
->data_offset
3065 + mddev
->dev_sectors
> rdev
->sectors
)
3068 /* Metadata worries about other space details. */
3070 /* decreasing the offset is inconsistent with a backwards
3073 if (new_offset
< rdev
->data_offset
&&
3074 mddev
->reshape_backwards
)
3076 /* Increasing offset is inconsistent with forwards
3077 * reshape. reshape_direction should be set to
3078 * 'backwards' first.
3080 if (new_offset
> rdev
->data_offset
&&
3081 !mddev
->reshape_backwards
)
3084 if (mddev
->pers
&& mddev
->persistent
&&
3085 !super_types
[mddev
->major_version
]
3086 .allow_new_offset(rdev
, new_offset
))
3088 rdev
->new_data_offset
= new_offset
;
3089 if (new_offset
> rdev
->data_offset
)
3090 mddev
->reshape_backwards
= 1;
3091 else if (new_offset
< rdev
->data_offset
)
3092 mddev
->reshape_backwards
= 0;
3096 static struct rdev_sysfs_entry rdev_new_offset
=
3097 __ATTR(new_offset
, S_IRUGO
|S_IWUSR
, new_offset_show
, new_offset_store
);
3100 rdev_size_show(struct md_rdev
*rdev
, char *page
)
3102 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->sectors
/ 2);
3105 static int overlaps(sector_t s1
, sector_t l1
, sector_t s2
, sector_t l2
)
3107 /* check if two start/length pairs overlap */
3115 static int strict_blocks_to_sectors(const char *buf
, sector_t
*sectors
)
3117 unsigned long long blocks
;
3120 if (kstrtoull(buf
, 10, &blocks
) < 0)
3123 if (blocks
& 1ULL << (8 * sizeof(blocks
) - 1))
3124 return -EINVAL
; /* sector conversion overflow */
3127 if (new != blocks
* 2)
3128 return -EINVAL
; /* unsigned long long to sector_t overflow */
3135 rdev_size_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3137 struct mddev
*my_mddev
= rdev
->mddev
;
3138 sector_t oldsectors
= rdev
->sectors
;
3141 if (test_bit(Journal
, &rdev
->flags
))
3143 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
3145 if (rdev
->data_offset
!= rdev
->new_data_offset
)
3146 return -EINVAL
; /* too confusing */
3147 if (my_mddev
->pers
&& rdev
->raid_disk
>= 0) {
3148 if (my_mddev
->persistent
) {
3149 sectors
= super_types
[my_mddev
->major_version
].
3150 rdev_size_change(rdev
, sectors
);
3153 } else if (!sectors
)
3154 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) -
3156 if (!my_mddev
->pers
->resize
)
3157 /* Cannot change size for RAID0 or Linear etc */
3160 if (sectors
< my_mddev
->dev_sectors
)
3161 return -EINVAL
; /* component must fit device */
3163 rdev
->sectors
= sectors
;
3164 if (sectors
> oldsectors
&& my_mddev
->external
) {
3165 /* Need to check that all other rdevs with the same
3166 * ->bdev do not overlap. 'rcu' is sufficient to walk
3167 * the rdev lists safely.
3168 * This check does not provide a hard guarantee, it
3169 * just helps avoid dangerous mistakes.
3171 struct mddev
*mddev
;
3173 struct list_head
*tmp
;
3176 for_each_mddev(mddev
, tmp
) {
3177 struct md_rdev
*rdev2
;
3179 rdev_for_each(rdev2
, mddev
)
3180 if (rdev
->bdev
== rdev2
->bdev
&&
3182 overlaps(rdev
->data_offset
, rdev
->sectors
,
3195 /* Someone else could have slipped in a size
3196 * change here, but doing so is just silly.
3197 * We put oldsectors back because we *know* it is
3198 * safe, and trust userspace not to race with
3201 rdev
->sectors
= oldsectors
;
3208 static struct rdev_sysfs_entry rdev_size
=
3209 __ATTR(size
, S_IRUGO
|S_IWUSR
, rdev_size_show
, rdev_size_store
);
3211 static ssize_t
recovery_start_show(struct md_rdev
*rdev
, char *page
)
3213 unsigned long long recovery_start
= rdev
->recovery_offset
;
3215 if (test_bit(In_sync
, &rdev
->flags
) ||
3216 recovery_start
== MaxSector
)
3217 return sprintf(page
, "none\n");
3219 return sprintf(page
, "%llu\n", recovery_start
);
3222 static ssize_t
recovery_start_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3224 unsigned long long recovery_start
;
3226 if (cmd_match(buf
, "none"))
3227 recovery_start
= MaxSector
;
3228 else if (kstrtoull(buf
, 10, &recovery_start
))
3231 if (rdev
->mddev
->pers
&&
3232 rdev
->raid_disk
>= 0)
3235 rdev
->recovery_offset
= recovery_start
;
3236 if (recovery_start
== MaxSector
)
3237 set_bit(In_sync
, &rdev
->flags
);
3239 clear_bit(In_sync
, &rdev
->flags
);
3243 static struct rdev_sysfs_entry rdev_recovery_start
=
3244 __ATTR(recovery_start
, S_IRUGO
|S_IWUSR
, recovery_start_show
, recovery_start_store
);
3246 /* sysfs access to bad-blocks list.
3247 * We present two files.
3248 * 'bad-blocks' lists sector numbers and lengths of ranges that
3249 * are recorded as bad. The list is truncated to fit within
3250 * the one-page limit of sysfs.
3251 * Writing "sector length" to this file adds an acknowledged
3253 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
3254 * been acknowledged. Writing to this file adds bad blocks
3255 * without acknowledging them. This is largely for testing.
3257 static ssize_t
bb_show(struct md_rdev
*rdev
, char *page
)
3259 return badblocks_show(&rdev
->badblocks
, page
, 0);
3261 static ssize_t
bb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
3263 int rv
= badblocks_store(&rdev
->badblocks
, page
, len
, 0);
3264 /* Maybe that ack was all we needed */
3265 if (test_and_clear_bit(BlockedBadBlocks
, &rdev
->flags
))
3266 wake_up(&rdev
->blocked_wait
);
3269 static struct rdev_sysfs_entry rdev_bad_blocks
=
3270 __ATTR(bad_blocks
, S_IRUGO
|S_IWUSR
, bb_show
, bb_store
);
3272 static ssize_t
ubb_show(struct md_rdev
*rdev
, char *page
)
3274 return badblocks_show(&rdev
->badblocks
, page
, 1);
3276 static ssize_t
ubb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
3278 return badblocks_store(&rdev
->badblocks
, page
, len
, 1);
3280 static struct rdev_sysfs_entry rdev_unack_bad_blocks
=
3281 __ATTR(unacknowledged_bad_blocks
, S_IRUGO
|S_IWUSR
, ubb_show
, ubb_store
);
3284 ppl_sector_show(struct md_rdev
*rdev
, char *page
)
3286 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->ppl
.sector
);
3290 ppl_sector_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3292 unsigned long long sector
;
3294 if (kstrtoull(buf
, 10, §or
) < 0)
3296 if (sector
!= (sector_t
)sector
)
3299 if (rdev
->mddev
->pers
&& test_bit(MD_HAS_PPL
, &rdev
->mddev
->flags
) &&
3300 rdev
->raid_disk
>= 0)
3303 if (rdev
->mddev
->persistent
) {
3304 if (rdev
->mddev
->major_version
== 0)
3306 if ((sector
> rdev
->sb_start
&&
3307 sector
- rdev
->sb_start
> S16_MAX
) ||
3308 (sector
< rdev
->sb_start
&&
3309 rdev
->sb_start
- sector
> -S16_MIN
))
3311 rdev
->ppl
.offset
= sector
- rdev
->sb_start
;
3312 } else if (!rdev
->mddev
->external
) {
3315 rdev
->ppl
.sector
= sector
;
3319 static struct rdev_sysfs_entry rdev_ppl_sector
=
3320 __ATTR(ppl_sector
, S_IRUGO
|S_IWUSR
, ppl_sector_show
, ppl_sector_store
);
3323 ppl_size_show(struct md_rdev
*rdev
, char *page
)
3325 return sprintf(page
, "%u\n", rdev
->ppl
.size
);
3329 ppl_size_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3333 if (kstrtouint(buf
, 10, &size
) < 0)
3336 if (rdev
->mddev
->pers
&& test_bit(MD_HAS_PPL
, &rdev
->mddev
->flags
) &&
3337 rdev
->raid_disk
>= 0)
3340 if (rdev
->mddev
->persistent
) {
3341 if (rdev
->mddev
->major_version
== 0)
3345 } else if (!rdev
->mddev
->external
) {
3348 rdev
->ppl
.size
= size
;
3352 static struct rdev_sysfs_entry rdev_ppl_size
=
3353 __ATTR(ppl_size
, S_IRUGO
|S_IWUSR
, ppl_size_show
, ppl_size_store
);
3355 static struct attribute
*rdev_default_attrs
[] = {
3360 &rdev_new_offset
.attr
,
3362 &rdev_recovery_start
.attr
,
3363 &rdev_bad_blocks
.attr
,
3364 &rdev_unack_bad_blocks
.attr
,
3365 &rdev_ppl_sector
.attr
,
3366 &rdev_ppl_size
.attr
,
3370 rdev_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
3372 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
3373 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
3379 return entry
->show(rdev
, page
);
3383 rdev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
3384 const char *page
, size_t length
)
3386 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
3387 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
3389 struct mddev
*mddev
= rdev
->mddev
;
3393 if (!capable(CAP_SYS_ADMIN
))
3395 rv
= mddev
? mddev_lock(mddev
): -EBUSY
;
3397 if (rdev
->mddev
== NULL
)
3400 rv
= entry
->store(rdev
, page
, length
);
3401 mddev_unlock(mddev
);
3406 static void rdev_free(struct kobject
*ko
)
3408 struct md_rdev
*rdev
= container_of(ko
, struct md_rdev
, kobj
);
3411 static const struct sysfs_ops rdev_sysfs_ops
= {
3412 .show
= rdev_attr_show
,
3413 .store
= rdev_attr_store
,
3415 static struct kobj_type rdev_ktype
= {
3416 .release
= rdev_free
,
3417 .sysfs_ops
= &rdev_sysfs_ops
,
3418 .default_attrs
= rdev_default_attrs
,
3421 int md_rdev_init(struct md_rdev
*rdev
)
3424 rdev
->saved_raid_disk
= -1;
3425 rdev
->raid_disk
= -1;
3427 rdev
->data_offset
= 0;
3428 rdev
->new_data_offset
= 0;
3429 rdev
->sb_events
= 0;
3430 rdev
->last_read_error
= 0;
3431 rdev
->sb_loaded
= 0;
3432 rdev
->bb_page
= NULL
;
3433 atomic_set(&rdev
->nr_pending
, 0);
3434 atomic_set(&rdev
->read_errors
, 0);
3435 atomic_set(&rdev
->corrected_errors
, 0);
3437 INIT_LIST_HEAD(&rdev
->same_set
);
3438 init_waitqueue_head(&rdev
->blocked_wait
);
3440 /* Add space to store bad block list.
3441 * This reserves the space even on arrays where it cannot
3442 * be used - I wonder if that matters
3444 return badblocks_init(&rdev
->badblocks
, 0);
3446 EXPORT_SYMBOL_GPL(md_rdev_init
);
3448 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3450 * mark the device faulty if:
3452 * - the device is nonexistent (zero size)
3453 * - the device has no valid superblock
3455 * a faulty rdev _never_ has rdev->sb set.
3457 static struct md_rdev
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
3459 char b
[BDEVNAME_SIZE
];
3461 struct md_rdev
*rdev
;
3464 rdev
= kzalloc(sizeof(*rdev
), GFP_KERNEL
);
3466 return ERR_PTR(-ENOMEM
);
3468 err
= md_rdev_init(rdev
);
3471 err
= alloc_disk_sb(rdev
);
3475 err
= lock_rdev(rdev
, newdev
, super_format
== -2);
3479 kobject_init(&rdev
->kobj
, &rdev_ktype
);
3481 size
= i_size_read(rdev
->bdev
->bd_inode
) >> BLOCK_SIZE_BITS
;
3483 pr_warn("md: %s has zero or unknown size, marking faulty!\n",
3484 bdevname(rdev
->bdev
,b
));
3489 if (super_format
>= 0) {
3490 err
= super_types
[super_format
].
3491 load_super(rdev
, NULL
, super_minor
);
3492 if (err
== -EINVAL
) {
3493 pr_warn("md: %s does not have a valid v%d.%d superblock, not importing!\n",
3494 bdevname(rdev
->bdev
,b
),
3495 super_format
, super_minor
);
3499 pr_warn("md: could not read %s's sb, not importing!\n",
3500 bdevname(rdev
->bdev
,b
));
3510 md_rdev_clear(rdev
);
3512 return ERR_PTR(err
);
3516 * Check a full RAID array for plausibility
3519 static void analyze_sbs(struct mddev
*mddev
)
3522 struct md_rdev
*rdev
, *freshest
, *tmp
;
3523 char b
[BDEVNAME_SIZE
];
3526 rdev_for_each_safe(rdev
, tmp
, mddev
)
3527 switch (super_types
[mddev
->major_version
].
3528 load_super(rdev
, freshest
, mddev
->minor_version
)) {
3535 pr_warn("md: fatal superblock inconsistency in %s -- removing from array\n",
3536 bdevname(rdev
->bdev
,b
));
3537 md_kick_rdev_from_array(rdev
);
3540 super_types
[mddev
->major_version
].
3541 validate_super(mddev
, freshest
);
3544 rdev_for_each_safe(rdev
, tmp
, mddev
) {
3545 if (mddev
->max_disks
&&
3546 (rdev
->desc_nr
>= mddev
->max_disks
||
3547 i
> mddev
->max_disks
)) {
3548 pr_warn("md: %s: %s: only %d devices permitted\n",
3549 mdname(mddev
), bdevname(rdev
->bdev
, b
),
3551 md_kick_rdev_from_array(rdev
);
3554 if (rdev
!= freshest
) {
3555 if (super_types
[mddev
->major_version
].
3556 validate_super(mddev
, rdev
)) {
3557 pr_warn("md: kicking non-fresh %s from array!\n",
3558 bdevname(rdev
->bdev
,b
));
3559 md_kick_rdev_from_array(rdev
);
3563 if (mddev
->level
== LEVEL_MULTIPATH
) {
3564 rdev
->desc_nr
= i
++;
3565 rdev
->raid_disk
= rdev
->desc_nr
;
3566 set_bit(In_sync
, &rdev
->flags
);
3567 } else if (rdev
->raid_disk
>=
3568 (mddev
->raid_disks
- min(0, mddev
->delta_disks
)) &&
3569 !test_bit(Journal
, &rdev
->flags
)) {
3570 rdev
->raid_disk
= -1;
3571 clear_bit(In_sync
, &rdev
->flags
);
3576 /* Read a fixed-point number.
3577 * Numbers in sysfs attributes should be in "standard" units where
3578 * possible, so time should be in seconds.
3579 * However we internally use a a much smaller unit such as
3580 * milliseconds or jiffies.
3581 * This function takes a decimal number with a possible fractional
3582 * component, and produces an integer which is the result of
3583 * multiplying that number by 10^'scale'.
3584 * all without any floating-point arithmetic.
3586 int strict_strtoul_scaled(const char *cp
, unsigned long *res
, int scale
)
3588 unsigned long result
= 0;
3590 while (isdigit(*cp
) || (*cp
== '.' && decimals
< 0)) {
3593 else if (decimals
< scale
) {
3596 result
= result
* 10 + value
;
3608 while (decimals
< scale
) {
3617 safe_delay_show(struct mddev
*mddev
, char *page
)
3619 int msec
= (mddev
->safemode_delay
*1000)/HZ
;
3620 return sprintf(page
, "%d.%03d\n", msec
/1000, msec
%1000);
3623 safe_delay_store(struct mddev
*mddev
, const char *cbuf
, size_t len
)
3627 if (mddev_is_clustered(mddev
)) {
3628 pr_warn("md: Safemode is disabled for clustered mode\n");
3632 if (strict_strtoul_scaled(cbuf
, &msec
, 3) < 0)
3635 mddev
->safemode_delay
= 0;
3637 unsigned long old_delay
= mddev
->safemode_delay
;
3638 unsigned long new_delay
= (msec
*HZ
)/1000;
3642 mddev
->safemode_delay
= new_delay
;
3643 if (new_delay
< old_delay
|| old_delay
== 0)
3644 mod_timer(&mddev
->safemode_timer
, jiffies
+1);
3648 static struct md_sysfs_entry md_safe_delay
=
3649 __ATTR(safe_mode_delay
, S_IRUGO
|S_IWUSR
,safe_delay_show
, safe_delay_store
);
3652 level_show(struct mddev
*mddev
, char *page
)
3654 struct md_personality
*p
;
3656 spin_lock(&mddev
->lock
);
3659 ret
= sprintf(page
, "%s\n", p
->name
);
3660 else if (mddev
->clevel
[0])
3661 ret
= sprintf(page
, "%s\n", mddev
->clevel
);
3662 else if (mddev
->level
!= LEVEL_NONE
)
3663 ret
= sprintf(page
, "%d\n", mddev
->level
);
3666 spin_unlock(&mddev
->lock
);
3671 level_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3676 struct md_personality
*pers
, *oldpers
;
3678 void *priv
, *oldpriv
;
3679 struct md_rdev
*rdev
;
3681 if (slen
== 0 || slen
>= sizeof(clevel
))
3684 rv
= mddev_lock(mddev
);
3688 if (mddev
->pers
== NULL
) {
3689 strncpy(mddev
->clevel
, buf
, slen
);
3690 if (mddev
->clevel
[slen
-1] == '\n')
3692 mddev
->clevel
[slen
] = 0;
3693 mddev
->level
= LEVEL_NONE
;
3701 /* request to change the personality. Need to ensure:
3702 * - array is not engaged in resync/recovery/reshape
3703 * - old personality can be suspended
3704 * - new personality will access other array.
3708 if (mddev
->sync_thread
||
3709 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
3710 mddev
->reshape_position
!= MaxSector
||
3711 mddev
->sysfs_active
)
3715 if (!mddev
->pers
->quiesce
) {
3716 pr_warn("md: %s: %s does not support online personality change\n",
3717 mdname(mddev
), mddev
->pers
->name
);
3721 /* Now find the new personality */
3722 strncpy(clevel
, buf
, slen
);
3723 if (clevel
[slen
-1] == '\n')
3726 if (kstrtol(clevel
, 10, &level
))
3729 if (request_module("md-%s", clevel
) != 0)
3730 request_module("md-level-%s", clevel
);
3731 spin_lock(&pers_lock
);
3732 pers
= find_pers(level
, clevel
);
3733 if (!pers
|| !try_module_get(pers
->owner
)) {
3734 spin_unlock(&pers_lock
);
3735 pr_warn("md: personality %s not loaded\n", clevel
);
3739 spin_unlock(&pers_lock
);
3741 if (pers
== mddev
->pers
) {
3742 /* Nothing to do! */
3743 module_put(pers
->owner
);
3747 if (!pers
->takeover
) {
3748 module_put(pers
->owner
);
3749 pr_warn("md: %s: %s does not support personality takeover\n",
3750 mdname(mddev
), clevel
);
3755 rdev_for_each(rdev
, mddev
)
3756 rdev
->new_raid_disk
= rdev
->raid_disk
;
3758 /* ->takeover must set new_* and/or delta_disks
3759 * if it succeeds, and may set them when it fails.
3761 priv
= pers
->takeover(mddev
);
3763 mddev
->new_level
= mddev
->level
;
3764 mddev
->new_layout
= mddev
->layout
;
3765 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3766 mddev
->raid_disks
-= mddev
->delta_disks
;
3767 mddev
->delta_disks
= 0;
3768 mddev
->reshape_backwards
= 0;
3769 module_put(pers
->owner
);
3770 pr_warn("md: %s: %s would not accept array\n",
3771 mdname(mddev
), clevel
);
3776 /* Looks like we have a winner */
3777 mddev_suspend(mddev
);
3778 mddev_detach(mddev
);
3780 spin_lock(&mddev
->lock
);
3781 oldpers
= mddev
->pers
;
3782 oldpriv
= mddev
->private;
3784 mddev
->private = priv
;
3785 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
3786 mddev
->level
= mddev
->new_level
;
3787 mddev
->layout
= mddev
->new_layout
;
3788 mddev
->chunk_sectors
= mddev
->new_chunk_sectors
;
3789 mddev
->delta_disks
= 0;
3790 mddev
->reshape_backwards
= 0;
3791 mddev
->degraded
= 0;
3792 spin_unlock(&mddev
->lock
);
3794 if (oldpers
->sync_request
== NULL
&&
3796 /* We are converting from a no-redundancy array
3797 * to a redundancy array and metadata is managed
3798 * externally so we need to be sure that writes
3799 * won't block due to a need to transition
3801 * until external management is started.
3804 mddev
->safemode_delay
= 0;
3805 mddev
->safemode
= 0;
3808 oldpers
->free(mddev
, oldpriv
);
3810 if (oldpers
->sync_request
== NULL
&&
3811 pers
->sync_request
!= NULL
) {
3812 /* need to add the md_redundancy_group */
3813 if (sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
3814 pr_warn("md: cannot register extra attributes for %s\n",
3816 mddev
->sysfs_action
= sysfs_get_dirent(mddev
->kobj
.sd
, "sync_action");
3818 if (oldpers
->sync_request
!= NULL
&&
3819 pers
->sync_request
== NULL
) {
3820 /* need to remove the md_redundancy_group */
3821 if (mddev
->to_remove
== NULL
)
3822 mddev
->to_remove
= &md_redundancy_group
;
3825 module_put(oldpers
->owner
);
3827 rdev_for_each(rdev
, mddev
) {
3828 if (rdev
->raid_disk
< 0)
3830 if (rdev
->new_raid_disk
>= mddev
->raid_disks
)
3831 rdev
->new_raid_disk
= -1;
3832 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3834 sysfs_unlink_rdev(mddev
, rdev
);
3836 rdev_for_each(rdev
, mddev
) {
3837 if (rdev
->raid_disk
< 0)
3839 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3841 rdev
->raid_disk
= rdev
->new_raid_disk
;
3842 if (rdev
->raid_disk
< 0)
3843 clear_bit(In_sync
, &rdev
->flags
);
3845 if (sysfs_link_rdev(mddev
, rdev
))
3846 pr_warn("md: cannot register rd%d for %s after level change\n",
3847 rdev
->raid_disk
, mdname(mddev
));
3851 if (pers
->sync_request
== NULL
) {
3852 /* this is now an array without redundancy, so
3853 * it must always be in_sync
3856 del_timer_sync(&mddev
->safemode_timer
);
3858 blk_set_stacking_limits(&mddev
->queue
->limits
);
3860 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
3861 mddev_resume(mddev
);
3863 md_update_sb(mddev
, 1);
3864 sysfs_notify(&mddev
->kobj
, NULL
, "level");
3865 md_new_event(mddev
);
3868 mddev_unlock(mddev
);
3872 static struct md_sysfs_entry md_level
=
3873 __ATTR(level
, S_IRUGO
|S_IWUSR
, level_show
, level_store
);
3876 layout_show(struct mddev
*mddev
, char *page
)
3878 /* just a number, not meaningful for all levels */
3879 if (mddev
->reshape_position
!= MaxSector
&&
3880 mddev
->layout
!= mddev
->new_layout
)
3881 return sprintf(page
, "%d (%d)\n",
3882 mddev
->new_layout
, mddev
->layout
);
3883 return sprintf(page
, "%d\n", mddev
->layout
);
3887 layout_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3892 err
= kstrtouint(buf
, 10, &n
);
3895 err
= mddev_lock(mddev
);
3900 if (mddev
->pers
->check_reshape
== NULL
)
3905 mddev
->new_layout
= n
;
3906 err
= mddev
->pers
->check_reshape(mddev
);
3908 mddev
->new_layout
= mddev
->layout
;
3911 mddev
->new_layout
= n
;
3912 if (mddev
->reshape_position
== MaxSector
)
3915 mddev_unlock(mddev
);
3918 static struct md_sysfs_entry md_layout
=
3919 __ATTR(layout
, S_IRUGO
|S_IWUSR
, layout_show
, layout_store
);
3922 raid_disks_show(struct mddev
*mddev
, char *page
)
3924 if (mddev
->raid_disks
== 0)
3926 if (mddev
->reshape_position
!= MaxSector
&&
3927 mddev
->delta_disks
!= 0)
3928 return sprintf(page
, "%d (%d)\n", mddev
->raid_disks
,
3929 mddev
->raid_disks
- mddev
->delta_disks
);
3930 return sprintf(page
, "%d\n", mddev
->raid_disks
);
3933 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
);
3936 raid_disks_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3941 err
= kstrtouint(buf
, 10, &n
);
3945 err
= mddev_lock(mddev
);
3949 err
= update_raid_disks(mddev
, n
);
3950 else if (mddev
->reshape_position
!= MaxSector
) {
3951 struct md_rdev
*rdev
;
3952 int olddisks
= mddev
->raid_disks
- mddev
->delta_disks
;
3955 rdev_for_each(rdev
, mddev
) {
3957 rdev
->data_offset
< rdev
->new_data_offset
)
3960 rdev
->data_offset
> rdev
->new_data_offset
)
3964 mddev
->delta_disks
= n
- olddisks
;
3965 mddev
->raid_disks
= n
;
3966 mddev
->reshape_backwards
= (mddev
->delta_disks
< 0);
3968 mddev
->raid_disks
= n
;
3970 mddev_unlock(mddev
);
3971 return err
? err
: len
;
3973 static struct md_sysfs_entry md_raid_disks
=
3974 __ATTR(raid_disks
, S_IRUGO
|S_IWUSR
, raid_disks_show
, raid_disks_store
);
3977 chunk_size_show(struct mddev
*mddev
, char *page
)
3979 if (mddev
->reshape_position
!= MaxSector
&&
3980 mddev
->chunk_sectors
!= mddev
->new_chunk_sectors
)
3981 return sprintf(page
, "%d (%d)\n",
3982 mddev
->new_chunk_sectors
<< 9,
3983 mddev
->chunk_sectors
<< 9);
3984 return sprintf(page
, "%d\n", mddev
->chunk_sectors
<< 9);
3988 chunk_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3993 err
= kstrtoul(buf
, 10, &n
);
3997 err
= mddev_lock(mddev
);
4001 if (mddev
->pers
->check_reshape
== NULL
)
4006 mddev
->new_chunk_sectors
= n
>> 9;
4007 err
= mddev
->pers
->check_reshape(mddev
);
4009 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
4012 mddev
->new_chunk_sectors
= n
>> 9;
4013 if (mddev
->reshape_position
== MaxSector
)
4014 mddev
->chunk_sectors
= n
>> 9;
4016 mddev_unlock(mddev
);
4019 static struct md_sysfs_entry md_chunk_size
=
4020 __ATTR(chunk_size
, S_IRUGO
|S_IWUSR
, chunk_size_show
, chunk_size_store
);
4023 resync_start_show(struct mddev
*mddev
, char *page
)
4025 if (mddev
->recovery_cp
== MaxSector
)
4026 return sprintf(page
, "none\n");
4027 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->recovery_cp
);
4031 resync_start_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4033 unsigned long long n
;
4036 if (cmd_match(buf
, "none"))
4039 err
= kstrtoull(buf
, 10, &n
);
4042 if (n
!= (sector_t
)n
)
4046 err
= mddev_lock(mddev
);
4049 if (mddev
->pers
&& !test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
4053 mddev
->recovery_cp
= n
;
4055 set_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
4057 mddev_unlock(mddev
);
4060 static struct md_sysfs_entry md_resync_start
=
4061 __ATTR_PREALLOC(resync_start
, S_IRUGO
|S_IWUSR
,
4062 resync_start_show
, resync_start_store
);
4065 * The array state can be:
4068 * No devices, no size, no level
4069 * Equivalent to STOP_ARRAY ioctl
4071 * May have some settings, but array is not active
4072 * all IO results in error
4073 * When written, doesn't tear down array, but just stops it
4074 * suspended (not supported yet)
4075 * All IO requests will block. The array can be reconfigured.
4076 * Writing this, if accepted, will block until array is quiescent
4078 * no resync can happen. no superblocks get written.
4079 * write requests fail
4081 * like readonly, but behaves like 'clean' on a write request.
4083 * clean - no pending writes, but otherwise active.
4084 * When written to inactive array, starts without resync
4085 * If a write request arrives then
4086 * if metadata is known, mark 'dirty' and switch to 'active'.
4087 * if not known, block and switch to write-pending
4088 * If written to an active array that has pending writes, then fails.
4090 * fully active: IO and resync can be happening.
4091 * When written to inactive array, starts with resync
4094 * clean, but writes are blocked waiting for 'active' to be written.
4097 * like active, but no writes have been seen for a while (100msec).
4100 enum array_state
{ clear
, inactive
, suspended
, readonly
, read_auto
, clean
, active
,
4101 write_pending
, active_idle
, bad_word
};
4102 static char *array_states
[] = {
4103 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
4104 "write-pending", "active-idle", NULL
};
4106 static int match_word(const char *word
, char **list
)
4109 for (n
=0; list
[n
]; n
++)
4110 if (cmd_match(word
, list
[n
]))
4116 array_state_show(struct mddev
*mddev
, char *page
)
4118 enum array_state st
= inactive
;
4129 spin_lock(&mddev
->lock
);
4130 if (test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
))
4132 else if (mddev
->in_sync
)
4134 else if (mddev
->safemode
)
4138 spin_unlock(&mddev
->lock
);
4141 if (list_empty(&mddev
->disks
) &&
4142 mddev
->raid_disks
== 0 &&
4143 mddev
->dev_sectors
== 0)
4148 return sprintf(page
, "%s\n", array_states
[st
]);
4151 static int do_md_stop(struct mddev
*mddev
, int ro
, struct block_device
*bdev
);
4152 static int md_set_readonly(struct mddev
*mddev
, struct block_device
*bdev
);
4153 static int do_md_run(struct mddev
*mddev
);
4154 static int restart_array(struct mddev
*mddev
);
4157 array_state_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4160 enum array_state st
= match_word(buf
, array_states
);
4162 if (mddev
->pers
&& (st
== active
|| st
== clean
) && mddev
->ro
!= 1) {
4163 /* don't take reconfig_mutex when toggling between
4166 spin_lock(&mddev
->lock
);
4168 restart_array(mddev
);
4169 clear_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
4170 md_wakeup_thread(mddev
->thread
);
4171 wake_up(&mddev
->sb_wait
);
4172 } else /* st == clean */ {
4173 restart_array(mddev
);
4174 if (!set_in_sync(mddev
))
4178 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4179 spin_unlock(&mddev
->lock
);
4182 err
= mddev_lock(mddev
);
4190 /* stopping an active array */
4191 err
= do_md_stop(mddev
, 0, NULL
);
4194 /* stopping an active array */
4196 err
= do_md_stop(mddev
, 2, NULL
);
4198 err
= 0; /* already inactive */
4201 break; /* not supported yet */
4204 err
= md_set_readonly(mddev
, NULL
);
4207 set_disk_ro(mddev
->gendisk
, 1);
4208 err
= do_md_run(mddev
);
4214 err
= md_set_readonly(mddev
, NULL
);
4215 else if (mddev
->ro
== 1)
4216 err
= restart_array(mddev
);
4219 set_disk_ro(mddev
->gendisk
, 0);
4223 err
= do_md_run(mddev
);
4228 err
= restart_array(mddev
);
4231 spin_lock(&mddev
->lock
);
4232 if (!set_in_sync(mddev
))
4234 spin_unlock(&mddev
->lock
);
4240 err
= restart_array(mddev
);
4243 clear_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
4244 wake_up(&mddev
->sb_wait
);
4248 set_disk_ro(mddev
->gendisk
, 0);
4249 err
= do_md_run(mddev
);
4254 /* these cannot be set */
4259 if (mddev
->hold_active
== UNTIL_IOCTL
)
4260 mddev
->hold_active
= 0;
4261 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4263 mddev_unlock(mddev
);
4266 static struct md_sysfs_entry md_array_state
=
4267 __ATTR_PREALLOC(array_state
, S_IRUGO
|S_IWUSR
, array_state_show
, array_state_store
);
4270 max_corrected_read_errors_show(struct mddev
*mddev
, char *page
) {
4271 return sprintf(page
, "%d\n",
4272 atomic_read(&mddev
->max_corr_read_errors
));
4276 max_corrected_read_errors_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4281 rv
= kstrtouint(buf
, 10, &n
);
4284 atomic_set(&mddev
->max_corr_read_errors
, n
);
4288 static struct md_sysfs_entry max_corr_read_errors
=
4289 __ATTR(max_read_errors
, S_IRUGO
|S_IWUSR
, max_corrected_read_errors_show
,
4290 max_corrected_read_errors_store
);
4293 null_show(struct mddev
*mddev
, char *page
)
4299 new_dev_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4301 /* buf must be %d:%d\n? giving major and minor numbers */
4302 /* The new device is added to the array.
4303 * If the array has a persistent superblock, we read the
4304 * superblock to initialise info and check validity.
4305 * Otherwise, only checking done is that in bind_rdev_to_array,
4306 * which mainly checks size.
4309 int major
= simple_strtoul(buf
, &e
, 10);
4312 struct md_rdev
*rdev
;
4315 if (!*buf
|| *e
!= ':' || !e
[1] || e
[1] == '\n')
4317 minor
= simple_strtoul(e
+1, &e
, 10);
4318 if (*e
&& *e
!= '\n')
4320 dev
= MKDEV(major
, minor
);
4321 if (major
!= MAJOR(dev
) ||
4322 minor
!= MINOR(dev
))
4325 flush_workqueue(md_misc_wq
);
4327 err
= mddev_lock(mddev
);
4330 if (mddev
->persistent
) {
4331 rdev
= md_import_device(dev
, mddev
->major_version
,
4332 mddev
->minor_version
);
4333 if (!IS_ERR(rdev
) && !list_empty(&mddev
->disks
)) {
4334 struct md_rdev
*rdev0
4335 = list_entry(mddev
->disks
.next
,
4336 struct md_rdev
, same_set
);
4337 err
= super_types
[mddev
->major_version
]
4338 .load_super(rdev
, rdev0
, mddev
->minor_version
);
4342 } else if (mddev
->external
)
4343 rdev
= md_import_device(dev
, -2, -1);
4345 rdev
= md_import_device(dev
, -1, -1);
4348 mddev_unlock(mddev
);
4349 return PTR_ERR(rdev
);
4351 err
= bind_rdev_to_array(rdev
, mddev
);
4355 mddev_unlock(mddev
);
4357 md_new_event(mddev
);
4358 return err
? err
: len
;
4361 static struct md_sysfs_entry md_new_device
=
4362 __ATTR(new_dev
, S_IWUSR
, null_show
, new_dev_store
);
4365 bitmap_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4368 unsigned long chunk
, end_chunk
;
4371 err
= mddev_lock(mddev
);
4376 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
4378 chunk
= end_chunk
= simple_strtoul(buf
, &end
, 0);
4379 if (buf
== end
) break;
4380 if (*end
== '-') { /* range */
4382 end_chunk
= simple_strtoul(buf
, &end
, 0);
4383 if (buf
== end
) break;
4385 if (*end
&& !isspace(*end
)) break;
4386 md_bitmap_dirty_bits(mddev
->bitmap
, chunk
, end_chunk
);
4387 buf
= skip_spaces(end
);
4389 md_bitmap_unplug(mddev
->bitmap
); /* flush the bits to disk */
4391 mddev_unlock(mddev
);
4395 static struct md_sysfs_entry md_bitmap
=
4396 __ATTR(bitmap_set_bits
, S_IWUSR
, null_show
, bitmap_store
);
4399 size_show(struct mddev
*mddev
, char *page
)
4401 return sprintf(page
, "%llu\n",
4402 (unsigned long long)mddev
->dev_sectors
/ 2);
4405 static int update_size(struct mddev
*mddev
, sector_t num_sectors
);
4408 size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4410 /* If array is inactive, we can reduce the component size, but
4411 * not increase it (except from 0).
4412 * If array is active, we can try an on-line resize
4415 int err
= strict_blocks_to_sectors(buf
, §ors
);
4419 err
= mddev_lock(mddev
);
4423 err
= update_size(mddev
, sectors
);
4425 md_update_sb(mddev
, 1);
4427 if (mddev
->dev_sectors
== 0 ||
4428 mddev
->dev_sectors
> sectors
)
4429 mddev
->dev_sectors
= sectors
;
4433 mddev_unlock(mddev
);
4434 return err
? err
: len
;
4437 static struct md_sysfs_entry md_size
=
4438 __ATTR(component_size
, S_IRUGO
|S_IWUSR
, size_show
, size_store
);
4440 /* Metadata version.
4442 * 'none' for arrays with no metadata (good luck...)
4443 * 'external' for arrays with externally managed metadata,
4444 * or N.M for internally known formats
4447 metadata_show(struct mddev
*mddev
, char *page
)
4449 if (mddev
->persistent
)
4450 return sprintf(page
, "%d.%d\n",
4451 mddev
->major_version
, mddev
->minor_version
);
4452 else if (mddev
->external
)
4453 return sprintf(page
, "external:%s\n", mddev
->metadata_type
);
4455 return sprintf(page
, "none\n");
4459 metadata_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4464 /* Changing the details of 'external' metadata is
4465 * always permitted. Otherwise there must be
4466 * no devices attached to the array.
4469 err
= mddev_lock(mddev
);
4473 if (mddev
->external
&& strncmp(buf
, "external:", 9) == 0)
4475 else if (!list_empty(&mddev
->disks
))
4479 if (cmd_match(buf
, "none")) {
4480 mddev
->persistent
= 0;
4481 mddev
->external
= 0;
4482 mddev
->major_version
= 0;
4483 mddev
->minor_version
= 90;
4486 if (strncmp(buf
, "external:", 9) == 0) {
4487 size_t namelen
= len
-9;
4488 if (namelen
>= sizeof(mddev
->metadata_type
))
4489 namelen
= sizeof(mddev
->metadata_type
)-1;
4490 strncpy(mddev
->metadata_type
, buf
+9, namelen
);
4491 mddev
->metadata_type
[namelen
] = 0;
4492 if (namelen
&& mddev
->metadata_type
[namelen
-1] == '\n')
4493 mddev
->metadata_type
[--namelen
] = 0;
4494 mddev
->persistent
= 0;
4495 mddev
->external
= 1;
4496 mddev
->major_version
= 0;
4497 mddev
->minor_version
= 90;
4500 major
= simple_strtoul(buf
, &e
, 10);
4502 if (e
==buf
|| *e
!= '.')
4505 minor
= simple_strtoul(buf
, &e
, 10);
4506 if (e
==buf
|| (*e
&& *e
!= '\n') )
4509 if (major
>= ARRAY_SIZE(super_types
) || super_types
[major
].name
== NULL
)
4511 mddev
->major_version
= major
;
4512 mddev
->minor_version
= minor
;
4513 mddev
->persistent
= 1;
4514 mddev
->external
= 0;
4517 mddev_unlock(mddev
);
4521 static struct md_sysfs_entry md_metadata
=
4522 __ATTR_PREALLOC(metadata_version
, S_IRUGO
|S_IWUSR
, metadata_show
, metadata_store
);
4525 action_show(struct mddev
*mddev
, char *page
)
4527 char *type
= "idle";
4528 unsigned long recovery
= mddev
->recovery
;
4529 if (test_bit(MD_RECOVERY_FROZEN
, &recovery
))
4531 else if (test_bit(MD_RECOVERY_RUNNING
, &recovery
) ||
4532 (!mddev
->ro
&& test_bit(MD_RECOVERY_NEEDED
, &recovery
))) {
4533 if (test_bit(MD_RECOVERY_RESHAPE
, &recovery
))
4535 else if (test_bit(MD_RECOVERY_SYNC
, &recovery
)) {
4536 if (!test_bit(MD_RECOVERY_REQUESTED
, &recovery
))
4538 else if (test_bit(MD_RECOVERY_CHECK
, &recovery
))
4542 } else if (test_bit(MD_RECOVERY_RECOVER
, &recovery
))
4544 else if (mddev
->reshape_position
!= MaxSector
)
4547 return sprintf(page
, "%s\n", type
);
4551 action_store(struct mddev
*mddev
, const char *page
, size_t len
)
4553 if (!mddev
->pers
|| !mddev
->pers
->sync_request
)
4557 if (cmd_match(page
, "idle") || cmd_match(page
, "frozen")) {
4558 if (cmd_match(page
, "frozen"))
4559 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4561 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4562 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
4563 mddev_lock(mddev
) == 0) {
4564 flush_workqueue(md_misc_wq
);
4565 if (mddev
->sync_thread
) {
4566 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4567 md_reap_sync_thread(mddev
);
4569 mddev_unlock(mddev
);
4571 } else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4573 else if (cmd_match(page
, "resync"))
4574 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4575 else if (cmd_match(page
, "recover")) {
4576 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4577 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
4578 } else if (cmd_match(page
, "reshape")) {
4580 if (mddev
->pers
->start_reshape
== NULL
)
4582 err
= mddev_lock(mddev
);
4584 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4587 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4588 err
= mddev
->pers
->start_reshape(mddev
);
4590 mddev_unlock(mddev
);
4594 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
4596 if (cmd_match(page
, "check"))
4597 set_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
4598 else if (!cmd_match(page
, "repair"))
4600 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4601 set_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
4602 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
4604 if (mddev
->ro
== 2) {
4605 /* A write to sync_action is enough to justify
4606 * canceling read-auto mode
4609 md_wakeup_thread(mddev
->sync_thread
);
4611 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4612 md_wakeup_thread(mddev
->thread
);
4613 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
4617 static struct md_sysfs_entry md_scan_mode
=
4618 __ATTR_PREALLOC(sync_action
, S_IRUGO
|S_IWUSR
, action_show
, action_store
);
4621 last_sync_action_show(struct mddev
*mddev
, char *page
)
4623 return sprintf(page
, "%s\n", mddev
->last_sync_action
);
4626 static struct md_sysfs_entry md_last_scan_mode
= __ATTR_RO(last_sync_action
);
4629 mismatch_cnt_show(struct mddev
*mddev
, char *page
)
4631 return sprintf(page
, "%llu\n",
4632 (unsigned long long)
4633 atomic64_read(&mddev
->resync_mismatches
));
4636 static struct md_sysfs_entry md_mismatches
= __ATTR_RO(mismatch_cnt
);
4639 sync_min_show(struct mddev
*mddev
, char *page
)
4641 return sprintf(page
, "%d (%s)\n", speed_min(mddev
),
4642 mddev
->sync_speed_min
? "local": "system");
4646 sync_min_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4651 if (strncmp(buf
, "system", 6)==0) {
4654 rv
= kstrtouint(buf
, 10, &min
);
4660 mddev
->sync_speed_min
= min
;
4664 static struct md_sysfs_entry md_sync_min
=
4665 __ATTR(sync_speed_min
, S_IRUGO
|S_IWUSR
, sync_min_show
, sync_min_store
);
4668 sync_max_show(struct mddev
*mddev
, char *page
)
4670 return sprintf(page
, "%d (%s)\n", speed_max(mddev
),
4671 mddev
->sync_speed_max
? "local": "system");
4675 sync_max_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4680 if (strncmp(buf
, "system", 6)==0) {
4683 rv
= kstrtouint(buf
, 10, &max
);
4689 mddev
->sync_speed_max
= max
;
4693 static struct md_sysfs_entry md_sync_max
=
4694 __ATTR(sync_speed_max
, S_IRUGO
|S_IWUSR
, sync_max_show
, sync_max_store
);
4697 degraded_show(struct mddev
*mddev
, char *page
)
4699 return sprintf(page
, "%d\n", mddev
->degraded
);
4701 static struct md_sysfs_entry md_degraded
= __ATTR_RO(degraded
);
4704 sync_force_parallel_show(struct mddev
*mddev
, char *page
)
4706 return sprintf(page
, "%d\n", mddev
->parallel_resync
);
4710 sync_force_parallel_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4714 if (kstrtol(buf
, 10, &n
))
4717 if (n
!= 0 && n
!= 1)
4720 mddev
->parallel_resync
= n
;
4722 if (mddev
->sync_thread
)
4723 wake_up(&resync_wait
);
4728 /* force parallel resync, even with shared block devices */
4729 static struct md_sysfs_entry md_sync_force_parallel
=
4730 __ATTR(sync_force_parallel
, S_IRUGO
|S_IWUSR
,
4731 sync_force_parallel_show
, sync_force_parallel_store
);
4734 sync_speed_show(struct mddev
*mddev
, char *page
)
4736 unsigned long resync
, dt
, db
;
4737 if (mddev
->curr_resync
== 0)
4738 return sprintf(page
, "none\n");
4739 resync
= mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
);
4740 dt
= (jiffies
- mddev
->resync_mark
) / HZ
;
4742 db
= resync
- mddev
->resync_mark_cnt
;
4743 return sprintf(page
, "%lu\n", db
/dt
/2); /* K/sec */
4746 static struct md_sysfs_entry md_sync_speed
= __ATTR_RO(sync_speed
);
4749 sync_completed_show(struct mddev
*mddev
, char *page
)
4751 unsigned long long max_sectors
, resync
;
4753 if (!test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4754 return sprintf(page
, "none\n");
4756 if (mddev
->curr_resync
== 1 ||
4757 mddev
->curr_resync
== 2)
4758 return sprintf(page
, "delayed\n");
4760 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
4761 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
4762 max_sectors
= mddev
->resync_max_sectors
;
4764 max_sectors
= mddev
->dev_sectors
;
4766 resync
= mddev
->curr_resync_completed
;
4767 return sprintf(page
, "%llu / %llu\n", resync
, max_sectors
);
4770 static struct md_sysfs_entry md_sync_completed
=
4771 __ATTR_PREALLOC(sync_completed
, S_IRUGO
, sync_completed_show
, NULL
);
4774 min_sync_show(struct mddev
*mddev
, char *page
)
4776 return sprintf(page
, "%llu\n",
4777 (unsigned long long)mddev
->resync_min
);
4780 min_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4782 unsigned long long min
;
4785 if (kstrtoull(buf
, 10, &min
))
4788 spin_lock(&mddev
->lock
);
4790 if (min
> mddev
->resync_max
)
4794 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4797 /* Round down to multiple of 4K for safety */
4798 mddev
->resync_min
= round_down(min
, 8);
4802 spin_unlock(&mddev
->lock
);
4806 static struct md_sysfs_entry md_min_sync
=
4807 __ATTR(sync_min
, S_IRUGO
|S_IWUSR
, min_sync_show
, min_sync_store
);
4810 max_sync_show(struct mddev
*mddev
, char *page
)
4812 if (mddev
->resync_max
== MaxSector
)
4813 return sprintf(page
, "max\n");
4815 return sprintf(page
, "%llu\n",
4816 (unsigned long long)mddev
->resync_max
);
4819 max_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4822 spin_lock(&mddev
->lock
);
4823 if (strncmp(buf
, "max", 3) == 0)
4824 mddev
->resync_max
= MaxSector
;
4826 unsigned long long max
;
4830 if (kstrtoull(buf
, 10, &max
))
4832 if (max
< mddev
->resync_min
)
4836 if (max
< mddev
->resync_max
&&
4838 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4841 /* Must be a multiple of chunk_size */
4842 chunk
= mddev
->chunk_sectors
;
4844 sector_t temp
= max
;
4847 if (sector_div(temp
, chunk
))
4850 mddev
->resync_max
= max
;
4852 wake_up(&mddev
->recovery_wait
);
4855 spin_unlock(&mddev
->lock
);
4859 static struct md_sysfs_entry md_max_sync
=
4860 __ATTR(sync_max
, S_IRUGO
|S_IWUSR
, max_sync_show
, max_sync_store
);
4863 suspend_lo_show(struct mddev
*mddev
, char *page
)
4865 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_lo
);
4869 suspend_lo_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4871 unsigned long long new;
4874 err
= kstrtoull(buf
, 10, &new);
4877 if (new != (sector_t
)new)
4880 err
= mddev_lock(mddev
);
4884 if (mddev
->pers
== NULL
||
4885 mddev
->pers
->quiesce
== NULL
)
4887 mddev_suspend(mddev
);
4888 mddev
->suspend_lo
= new;
4889 mddev_resume(mddev
);
4893 mddev_unlock(mddev
);
4896 static struct md_sysfs_entry md_suspend_lo
=
4897 __ATTR(suspend_lo
, S_IRUGO
|S_IWUSR
, suspend_lo_show
, suspend_lo_store
);
4900 suspend_hi_show(struct mddev
*mddev
, char *page
)
4902 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_hi
);
4906 suspend_hi_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4908 unsigned long long new;
4911 err
= kstrtoull(buf
, 10, &new);
4914 if (new != (sector_t
)new)
4917 err
= mddev_lock(mddev
);
4921 if (mddev
->pers
== NULL
)
4924 mddev_suspend(mddev
);
4925 mddev
->suspend_hi
= new;
4926 mddev_resume(mddev
);
4930 mddev_unlock(mddev
);
4933 static struct md_sysfs_entry md_suspend_hi
=
4934 __ATTR(suspend_hi
, S_IRUGO
|S_IWUSR
, suspend_hi_show
, suspend_hi_store
);
4937 reshape_position_show(struct mddev
*mddev
, char *page
)
4939 if (mddev
->reshape_position
!= MaxSector
)
4940 return sprintf(page
, "%llu\n",
4941 (unsigned long long)mddev
->reshape_position
);
4942 strcpy(page
, "none\n");
4947 reshape_position_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4949 struct md_rdev
*rdev
;
4950 unsigned long long new;
4953 err
= kstrtoull(buf
, 10, &new);
4956 if (new != (sector_t
)new)
4958 err
= mddev_lock(mddev
);
4964 mddev
->reshape_position
= new;
4965 mddev
->delta_disks
= 0;
4966 mddev
->reshape_backwards
= 0;
4967 mddev
->new_level
= mddev
->level
;
4968 mddev
->new_layout
= mddev
->layout
;
4969 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
4970 rdev_for_each(rdev
, mddev
)
4971 rdev
->new_data_offset
= rdev
->data_offset
;
4974 mddev_unlock(mddev
);
4978 static struct md_sysfs_entry md_reshape_position
=
4979 __ATTR(reshape_position
, S_IRUGO
|S_IWUSR
, reshape_position_show
,
4980 reshape_position_store
);
4983 reshape_direction_show(struct mddev
*mddev
, char *page
)
4985 return sprintf(page
, "%s\n",
4986 mddev
->reshape_backwards
? "backwards" : "forwards");
4990 reshape_direction_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4995 if (cmd_match(buf
, "forwards"))
4997 else if (cmd_match(buf
, "backwards"))
5001 if (mddev
->reshape_backwards
== backwards
)
5004 err
= mddev_lock(mddev
);
5007 /* check if we are allowed to change */
5008 if (mddev
->delta_disks
)
5010 else if (mddev
->persistent
&&
5011 mddev
->major_version
== 0)
5014 mddev
->reshape_backwards
= backwards
;
5015 mddev_unlock(mddev
);
5019 static struct md_sysfs_entry md_reshape_direction
=
5020 __ATTR(reshape_direction
, S_IRUGO
|S_IWUSR
, reshape_direction_show
,
5021 reshape_direction_store
);
5024 array_size_show(struct mddev
*mddev
, char *page
)
5026 if (mddev
->external_size
)
5027 return sprintf(page
, "%llu\n",
5028 (unsigned long long)mddev
->array_sectors
/2);
5030 return sprintf(page
, "default\n");
5034 array_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
5039 err
= mddev_lock(mddev
);
5043 /* cluster raid doesn't support change array_sectors */
5044 if (mddev_is_clustered(mddev
)) {
5045 mddev_unlock(mddev
);
5049 if (strncmp(buf
, "default", 7) == 0) {
5051 sectors
= mddev
->pers
->size(mddev
, 0, 0);
5053 sectors
= mddev
->array_sectors
;
5055 mddev
->external_size
= 0;
5057 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
5059 else if (mddev
->pers
&& mddev
->pers
->size(mddev
, 0, 0) < sectors
)
5062 mddev
->external_size
= 1;
5066 mddev
->array_sectors
= sectors
;
5068 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
5069 revalidate_disk(mddev
->gendisk
);
5072 mddev_unlock(mddev
);
5076 static struct md_sysfs_entry md_array_size
=
5077 __ATTR(array_size
, S_IRUGO
|S_IWUSR
, array_size_show
,
5081 consistency_policy_show(struct mddev
*mddev
, char *page
)
5085 if (test_bit(MD_HAS_JOURNAL
, &mddev
->flags
)) {
5086 ret
= sprintf(page
, "journal\n");
5087 } else if (test_bit(MD_HAS_PPL
, &mddev
->flags
)) {
5088 ret
= sprintf(page
, "ppl\n");
5089 } else if (mddev
->bitmap
) {
5090 ret
= sprintf(page
, "bitmap\n");
5091 } else if (mddev
->pers
) {
5092 if (mddev
->pers
->sync_request
)
5093 ret
= sprintf(page
, "resync\n");
5095 ret
= sprintf(page
, "none\n");
5097 ret
= sprintf(page
, "unknown\n");
5104 consistency_policy_store(struct mddev
*mddev
, const char *buf
, size_t len
)
5109 if (mddev
->pers
->change_consistency_policy
)
5110 err
= mddev
->pers
->change_consistency_policy(mddev
, buf
);
5113 } else if (mddev
->external
&& strncmp(buf
, "ppl", 3) == 0) {
5114 set_bit(MD_HAS_PPL
, &mddev
->flags
);
5119 return err
? err
: len
;
5122 static struct md_sysfs_entry md_consistency_policy
=
5123 __ATTR(consistency_policy
, S_IRUGO
| S_IWUSR
, consistency_policy_show
,
5124 consistency_policy_store
);
5126 static struct attribute
*md_default_attrs
[] = {
5129 &md_raid_disks
.attr
,
5130 &md_chunk_size
.attr
,
5132 &md_resync_start
.attr
,
5134 &md_new_device
.attr
,
5135 &md_safe_delay
.attr
,
5136 &md_array_state
.attr
,
5137 &md_reshape_position
.attr
,
5138 &md_reshape_direction
.attr
,
5139 &md_array_size
.attr
,
5140 &max_corr_read_errors
.attr
,
5141 &md_consistency_policy
.attr
,
5145 static struct attribute
*md_redundancy_attrs
[] = {
5147 &md_last_scan_mode
.attr
,
5148 &md_mismatches
.attr
,
5151 &md_sync_speed
.attr
,
5152 &md_sync_force_parallel
.attr
,
5153 &md_sync_completed
.attr
,
5156 &md_suspend_lo
.attr
,
5157 &md_suspend_hi
.attr
,
5162 static struct attribute_group md_redundancy_group
= {
5164 .attrs
= md_redundancy_attrs
,
5168 md_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
5170 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
5171 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
5176 spin_lock(&all_mddevs_lock
);
5177 if (list_empty(&mddev
->all_mddevs
)) {
5178 spin_unlock(&all_mddevs_lock
);
5182 spin_unlock(&all_mddevs_lock
);
5184 rv
= entry
->show(mddev
, page
);
5190 md_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
5191 const char *page
, size_t length
)
5193 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
5194 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
5199 if (!capable(CAP_SYS_ADMIN
))
5201 spin_lock(&all_mddevs_lock
);
5202 if (list_empty(&mddev
->all_mddevs
)) {
5203 spin_unlock(&all_mddevs_lock
);
5207 spin_unlock(&all_mddevs_lock
);
5208 rv
= entry
->store(mddev
, page
, length
);
5213 static void md_free(struct kobject
*ko
)
5215 struct mddev
*mddev
= container_of(ko
, struct mddev
, kobj
);
5217 if (mddev
->sysfs_state
)
5218 sysfs_put(mddev
->sysfs_state
);
5221 del_gendisk(mddev
->gendisk
);
5223 blk_cleanup_queue(mddev
->queue
);
5225 put_disk(mddev
->gendisk
);
5226 percpu_ref_exit(&mddev
->writes_pending
);
5228 bioset_exit(&mddev
->bio_set
);
5229 bioset_exit(&mddev
->sync_set
);
5233 static const struct sysfs_ops md_sysfs_ops
= {
5234 .show
= md_attr_show
,
5235 .store
= md_attr_store
,
5237 static struct kobj_type md_ktype
= {
5239 .sysfs_ops
= &md_sysfs_ops
,
5240 .default_attrs
= md_default_attrs
,
5245 static void mddev_delayed_delete(struct work_struct
*ws
)
5247 struct mddev
*mddev
= container_of(ws
, struct mddev
, del_work
);
5249 sysfs_remove_group(&mddev
->kobj
, &md_bitmap_group
);
5250 kobject_del(&mddev
->kobj
);
5251 kobject_put(&mddev
->kobj
);
5254 static void no_op(struct percpu_ref
*r
) {}
5256 int mddev_init_writes_pending(struct mddev
*mddev
)
5258 if (mddev
->writes_pending
.percpu_count_ptr
)
5260 if (percpu_ref_init(&mddev
->writes_pending
, no_op
, 0, GFP_KERNEL
) < 0)
5262 /* We want to start with the refcount at zero */
5263 percpu_ref_put(&mddev
->writes_pending
);
5266 EXPORT_SYMBOL_GPL(mddev_init_writes_pending
);
5268 static int md_alloc(dev_t dev
, char *name
)
5271 * If dev is zero, name is the name of a device to allocate with
5272 * an arbitrary minor number. It will be "md_???"
5273 * If dev is non-zero it must be a device number with a MAJOR of
5274 * MD_MAJOR or mdp_major. In this case, if "name" is NULL, then
5275 * the device is being created by opening a node in /dev.
5276 * If "name" is not NULL, the device is being created by
5277 * writing to /sys/module/md_mod/parameters/new_array.
5279 static DEFINE_MUTEX(disks_mutex
);
5280 struct mddev
*mddev
= mddev_find(dev
);
5281 struct gendisk
*disk
;
5290 partitioned
= (MAJOR(mddev
->unit
) != MD_MAJOR
);
5291 shift
= partitioned
? MdpMinorShift
: 0;
5292 unit
= MINOR(mddev
->unit
) >> shift
;
5294 /* wait for any previous instance of this device to be
5295 * completely removed (mddev_delayed_delete).
5297 flush_workqueue(md_misc_wq
);
5299 mutex_lock(&disks_mutex
);
5305 /* Need to ensure that 'name' is not a duplicate.
5307 struct mddev
*mddev2
;
5308 spin_lock(&all_mddevs_lock
);
5310 list_for_each_entry(mddev2
, &all_mddevs
, all_mddevs
)
5311 if (mddev2
->gendisk
&&
5312 strcmp(mddev2
->gendisk
->disk_name
, name
) == 0) {
5313 spin_unlock(&all_mddevs_lock
);
5316 spin_unlock(&all_mddevs_lock
);
5320 * Creating /dev/mdNNN via "newarray", so adjust hold_active.
5322 mddev
->hold_active
= UNTIL_STOP
;
5325 mddev
->queue
= blk_alloc_queue(GFP_KERNEL
);
5328 mddev
->queue
->queuedata
= mddev
;
5330 blk_queue_make_request(mddev
->queue
, md_make_request
);
5331 blk_set_stacking_limits(&mddev
->queue
->limits
);
5333 disk
= alloc_disk(1 << shift
);
5335 blk_cleanup_queue(mddev
->queue
);
5336 mddev
->queue
= NULL
;
5339 disk
->major
= MAJOR(mddev
->unit
);
5340 disk
->first_minor
= unit
<< shift
;
5342 strcpy(disk
->disk_name
, name
);
5343 else if (partitioned
)
5344 sprintf(disk
->disk_name
, "md_d%d", unit
);
5346 sprintf(disk
->disk_name
, "md%d", unit
);
5347 disk
->fops
= &md_fops
;
5348 disk
->private_data
= mddev
;
5349 disk
->queue
= mddev
->queue
;
5350 blk_queue_write_cache(mddev
->queue
, true, true);
5351 /* Allow extended partitions. This makes the
5352 * 'mdp' device redundant, but we can't really
5355 disk
->flags
|= GENHD_FL_EXT_DEVT
;
5356 mddev
->gendisk
= disk
;
5357 /* As soon as we call add_disk(), another thread could get
5358 * through to md_open, so make sure it doesn't get too far
5360 mutex_lock(&mddev
->open_mutex
);
5363 error
= kobject_add(&mddev
->kobj
, &disk_to_dev(disk
)->kobj
, "%s", "md");
5365 /* This isn't possible, but as kobject_init_and_add is marked
5366 * __must_check, we must do something with the result
5368 pr_debug("md: cannot register %s/md - name in use\n",
5372 if (mddev
->kobj
.sd
&&
5373 sysfs_create_group(&mddev
->kobj
, &md_bitmap_group
))
5374 pr_debug("pointless warning\n");
5375 mutex_unlock(&mddev
->open_mutex
);
5377 mutex_unlock(&disks_mutex
);
5378 if (!error
&& mddev
->kobj
.sd
) {
5379 kobject_uevent(&mddev
->kobj
, KOBJ_ADD
);
5380 mddev
->sysfs_state
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "array_state");
5386 static struct kobject
*md_probe(dev_t dev
, int *part
, void *data
)
5389 md_alloc(dev
, NULL
);
5393 static int add_named_array(const char *val
, const struct kernel_param
*kp
)
5396 * val must be "md_*" or "mdNNN".
5397 * For "md_*" we allocate an array with a large free minor number, and
5398 * set the name to val. val must not already be an active name.
5399 * For "mdNNN" we allocate an array with the minor number NNN
5400 * which must not already be in use.
5402 int len
= strlen(val
);
5403 char buf
[DISK_NAME_LEN
];
5404 unsigned long devnum
;
5406 while (len
&& val
[len
-1] == '\n')
5408 if (len
>= DISK_NAME_LEN
)
5410 strlcpy(buf
, val
, len
+1);
5411 if (strncmp(buf
, "md_", 3) == 0)
5412 return md_alloc(0, buf
);
5413 if (strncmp(buf
, "md", 2) == 0 &&
5415 kstrtoul(buf
+2, 10, &devnum
) == 0 &&
5416 devnum
<= MINORMASK
)
5417 return md_alloc(MKDEV(MD_MAJOR
, devnum
), NULL
);
5422 static void md_safemode_timeout(struct timer_list
*t
)
5424 struct mddev
*mddev
= from_timer(mddev
, t
, safemode_timer
);
5426 mddev
->safemode
= 1;
5427 if (mddev
->external
)
5428 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5430 md_wakeup_thread(mddev
->thread
);
5433 static int start_dirty_degraded
;
5435 int md_run(struct mddev
*mddev
)
5438 struct md_rdev
*rdev
;
5439 struct md_personality
*pers
;
5441 if (list_empty(&mddev
->disks
))
5442 /* cannot run an array with no devices.. */
5447 /* Cannot run until previous stop completes properly */
5448 if (mddev
->sysfs_active
)
5452 * Analyze all RAID superblock(s)
5454 if (!mddev
->raid_disks
) {
5455 if (!mddev
->persistent
)
5460 if (mddev
->level
!= LEVEL_NONE
)
5461 request_module("md-level-%d", mddev
->level
);
5462 else if (mddev
->clevel
[0])
5463 request_module("md-%s", mddev
->clevel
);
5466 * Drop all container device buffers, from now on
5467 * the only valid external interface is through the md
5470 mddev
->has_superblocks
= false;
5471 rdev_for_each(rdev
, mddev
) {
5472 if (test_bit(Faulty
, &rdev
->flags
))
5474 sync_blockdev(rdev
->bdev
);
5475 invalidate_bdev(rdev
->bdev
);
5476 if (mddev
->ro
!= 1 &&
5477 (bdev_read_only(rdev
->bdev
) ||
5478 bdev_read_only(rdev
->meta_bdev
))) {
5481 set_disk_ro(mddev
->gendisk
, 1);
5485 mddev
->has_superblocks
= true;
5487 /* perform some consistency tests on the device.
5488 * We don't want the data to overlap the metadata,
5489 * Internal Bitmap issues have been handled elsewhere.
5491 if (rdev
->meta_bdev
) {
5492 /* Nothing to check */;
5493 } else if (rdev
->data_offset
< rdev
->sb_start
) {
5494 if (mddev
->dev_sectors
&&
5495 rdev
->data_offset
+ mddev
->dev_sectors
5497 pr_warn("md: %s: data overlaps metadata\n",
5502 if (rdev
->sb_start
+ rdev
->sb_size
/512
5503 > rdev
->data_offset
) {
5504 pr_warn("md: %s: metadata overlaps data\n",
5509 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
5512 if (!bioset_initialized(&mddev
->bio_set
)) {
5513 err
= bioset_init(&mddev
->bio_set
, BIO_POOL_SIZE
, 0, BIOSET_NEED_BVECS
);
5517 if (!bioset_initialized(&mddev
->sync_set
)) {
5518 err
= bioset_init(&mddev
->sync_set
, BIO_POOL_SIZE
, 0, BIOSET_NEED_BVECS
);
5522 if (mddev
->flush_pool
== NULL
) {
5523 mddev
->flush_pool
= mempool_create(NR_FLUSH_INFOS
, flush_info_alloc
,
5524 flush_info_free
, mddev
);
5525 if (!mddev
->flush_pool
) {
5530 if (mddev
->flush_bio_pool
== NULL
) {
5531 mddev
->flush_bio_pool
= mempool_create(NR_FLUSH_BIOS
, flush_bio_alloc
,
5532 flush_bio_free
, mddev
);
5533 if (!mddev
->flush_bio_pool
) {
5539 spin_lock(&pers_lock
);
5540 pers
= find_pers(mddev
->level
, mddev
->clevel
);
5541 if (!pers
|| !try_module_get(pers
->owner
)) {
5542 spin_unlock(&pers_lock
);
5543 if (mddev
->level
!= LEVEL_NONE
)
5544 pr_warn("md: personality for level %d is not loaded!\n",
5547 pr_warn("md: personality for level %s is not loaded!\n",
5552 spin_unlock(&pers_lock
);
5553 if (mddev
->level
!= pers
->level
) {
5554 mddev
->level
= pers
->level
;
5555 mddev
->new_level
= pers
->level
;
5557 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
5559 if (mddev
->reshape_position
!= MaxSector
&&
5560 pers
->start_reshape
== NULL
) {
5561 /* This personality cannot handle reshaping... */
5562 module_put(pers
->owner
);
5567 if (pers
->sync_request
) {
5568 /* Warn if this is a potentially silly
5571 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
5572 struct md_rdev
*rdev2
;
5575 rdev_for_each(rdev
, mddev
)
5576 rdev_for_each(rdev2
, mddev
) {
5578 rdev
->bdev
->bd_contains
==
5579 rdev2
->bdev
->bd_contains
) {
5580 pr_warn("%s: WARNING: %s appears to be on the same physical disk as %s.\n",
5582 bdevname(rdev
->bdev
,b
),
5583 bdevname(rdev2
->bdev
,b2
));
5589 pr_warn("True protection against single-disk failure might be compromised.\n");
5592 mddev
->recovery
= 0;
5593 /* may be over-ridden by personality */
5594 mddev
->resync_max_sectors
= mddev
->dev_sectors
;
5596 mddev
->ok_start_degraded
= start_dirty_degraded
;
5598 if (start_readonly
&& mddev
->ro
== 0)
5599 mddev
->ro
= 2; /* read-only, but switch on first write */
5601 err
= pers
->run(mddev
);
5603 pr_warn("md: pers->run() failed ...\n");
5604 else if (pers
->size(mddev
, 0, 0) < mddev
->array_sectors
) {
5605 WARN_ONCE(!mddev
->external_size
,
5606 "%s: default size too small, but 'external_size' not in effect?\n",
5608 pr_warn("md: invalid array_size %llu > default size %llu\n",
5609 (unsigned long long)mddev
->array_sectors
/ 2,
5610 (unsigned long long)pers
->size(mddev
, 0, 0) / 2);
5613 if (err
== 0 && pers
->sync_request
&&
5614 (mddev
->bitmap_info
.file
|| mddev
->bitmap_info
.offset
)) {
5615 struct bitmap
*bitmap
;
5617 bitmap
= md_bitmap_create(mddev
, -1);
5618 if (IS_ERR(bitmap
)) {
5619 err
= PTR_ERR(bitmap
);
5620 pr_warn("%s: failed to create bitmap (%d)\n",
5621 mdname(mddev
), err
);
5623 mddev
->bitmap
= bitmap
;
5627 mddev_detach(mddev
);
5629 pers
->free(mddev
, mddev
->private);
5630 mddev
->private = NULL
;
5631 module_put(pers
->owner
);
5632 md_bitmap_destroy(mddev
);
5638 rdev_for_each(rdev
, mddev
) {
5639 if (rdev
->raid_disk
>= 0 &&
5640 !blk_queue_nonrot(bdev_get_queue(rdev
->bdev
))) {
5645 if (mddev
->degraded
)
5648 blk_queue_flag_set(QUEUE_FLAG_NONROT
, mddev
->queue
);
5650 blk_queue_flag_clear(QUEUE_FLAG_NONROT
, mddev
->queue
);
5651 mddev
->queue
->backing_dev_info
->congested_data
= mddev
;
5652 mddev
->queue
->backing_dev_info
->congested_fn
= md_congested
;
5654 if (pers
->sync_request
) {
5655 if (mddev
->kobj
.sd
&&
5656 sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
5657 pr_warn("md: cannot register extra attributes for %s\n",
5659 mddev
->sysfs_action
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "sync_action");
5660 } else if (mddev
->ro
== 2) /* auto-readonly not meaningful */
5663 atomic_set(&mddev
->max_corr_read_errors
,
5664 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS
);
5665 mddev
->safemode
= 0;
5666 if (mddev_is_clustered(mddev
))
5667 mddev
->safemode_delay
= 0;
5669 mddev
->safemode_delay
= (200 * HZ
)/1000 +1; /* 200 msec delay */
5672 spin_lock(&mddev
->lock
);
5674 spin_unlock(&mddev
->lock
);
5675 rdev_for_each(rdev
, mddev
)
5676 if (rdev
->raid_disk
>= 0)
5677 if (sysfs_link_rdev(mddev
, rdev
))
5678 /* failure here is OK */;
5680 if (mddev
->degraded
&& !mddev
->ro
)
5681 /* This ensures that recovering status is reported immediately
5682 * via sysfs - until a lack of spares is confirmed.
5684 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
5685 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5687 if (mddev
->sb_flags
)
5688 md_update_sb(mddev
, 0);
5690 md_new_event(mddev
);
5691 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5692 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
5693 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
5697 if (mddev
->flush_bio_pool
) {
5698 mempool_destroy(mddev
->flush_bio_pool
);
5699 mddev
->flush_bio_pool
= NULL
;
5701 if (mddev
->flush_pool
){
5702 mempool_destroy(mddev
->flush_pool
);
5703 mddev
->flush_pool
= NULL
;
5708 EXPORT_SYMBOL_GPL(md_run
);
5710 static int do_md_run(struct mddev
*mddev
)
5714 err
= md_run(mddev
);
5717 err
= md_bitmap_load(mddev
);
5719 md_bitmap_destroy(mddev
);
5723 if (mddev_is_clustered(mddev
))
5724 md_allow_write(mddev
);
5726 /* run start up tasks that require md_thread */
5729 md_wakeup_thread(mddev
->thread
);
5730 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
5732 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
5733 revalidate_disk(mddev
->gendisk
);
5735 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
5740 int md_start(struct mddev
*mddev
)
5744 if (mddev
->pers
->start
) {
5745 set_bit(MD_RECOVERY_WAIT
, &mddev
->recovery
);
5746 md_wakeup_thread(mddev
->thread
);
5747 ret
= mddev
->pers
->start(mddev
);
5748 clear_bit(MD_RECOVERY_WAIT
, &mddev
->recovery
);
5749 md_wakeup_thread(mddev
->sync_thread
);
5753 EXPORT_SYMBOL_GPL(md_start
);
5755 static int restart_array(struct mddev
*mddev
)
5757 struct gendisk
*disk
= mddev
->gendisk
;
5758 struct md_rdev
*rdev
;
5759 bool has_journal
= false;
5760 bool has_readonly
= false;
5762 /* Complain if it has no devices */
5763 if (list_empty(&mddev
->disks
))
5771 rdev_for_each_rcu(rdev
, mddev
) {
5772 if (test_bit(Journal
, &rdev
->flags
) &&
5773 !test_bit(Faulty
, &rdev
->flags
))
5775 if (bdev_read_only(rdev
->bdev
))
5776 has_readonly
= true;
5779 if (test_bit(MD_HAS_JOURNAL
, &mddev
->flags
) && !has_journal
)
5780 /* Don't restart rw with journal missing/faulty */
5785 mddev
->safemode
= 0;
5787 set_disk_ro(disk
, 0);
5788 pr_debug("md: %s switched to read-write mode.\n", mdname(mddev
));
5789 /* Kick recovery or resync if necessary */
5790 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5791 md_wakeup_thread(mddev
->thread
);
5792 md_wakeup_thread(mddev
->sync_thread
);
5793 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5797 static void md_clean(struct mddev
*mddev
)
5799 mddev
->array_sectors
= 0;
5800 mddev
->external_size
= 0;
5801 mddev
->dev_sectors
= 0;
5802 mddev
->raid_disks
= 0;
5803 mddev
->recovery_cp
= 0;
5804 mddev
->resync_min
= 0;
5805 mddev
->resync_max
= MaxSector
;
5806 mddev
->reshape_position
= MaxSector
;
5807 mddev
->external
= 0;
5808 mddev
->persistent
= 0;
5809 mddev
->level
= LEVEL_NONE
;
5810 mddev
->clevel
[0] = 0;
5812 mddev
->sb_flags
= 0;
5814 mddev
->metadata_type
[0] = 0;
5815 mddev
->chunk_sectors
= 0;
5816 mddev
->ctime
= mddev
->utime
= 0;
5818 mddev
->max_disks
= 0;
5820 mddev
->can_decrease_events
= 0;
5821 mddev
->delta_disks
= 0;
5822 mddev
->reshape_backwards
= 0;
5823 mddev
->new_level
= LEVEL_NONE
;
5824 mddev
->new_layout
= 0;
5825 mddev
->new_chunk_sectors
= 0;
5826 mddev
->curr_resync
= 0;
5827 atomic64_set(&mddev
->resync_mismatches
, 0);
5828 mddev
->suspend_lo
= mddev
->suspend_hi
= 0;
5829 mddev
->sync_speed_min
= mddev
->sync_speed_max
= 0;
5830 mddev
->recovery
= 0;
5833 mddev
->degraded
= 0;
5834 mddev
->safemode
= 0;
5835 mddev
->private = NULL
;
5836 mddev
->cluster_info
= NULL
;
5837 mddev
->bitmap_info
.offset
= 0;
5838 mddev
->bitmap_info
.default_offset
= 0;
5839 mddev
->bitmap_info
.default_space
= 0;
5840 mddev
->bitmap_info
.chunksize
= 0;
5841 mddev
->bitmap_info
.daemon_sleep
= 0;
5842 mddev
->bitmap_info
.max_write_behind
= 0;
5843 mddev
->bitmap_info
.nodes
= 0;
5846 static void __md_stop_writes(struct mddev
*mddev
)
5848 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5849 flush_workqueue(md_misc_wq
);
5850 if (mddev
->sync_thread
) {
5851 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5852 md_reap_sync_thread(mddev
);
5855 del_timer_sync(&mddev
->safemode_timer
);
5857 if (mddev
->pers
&& mddev
->pers
->quiesce
) {
5858 mddev
->pers
->quiesce(mddev
, 1);
5859 mddev
->pers
->quiesce(mddev
, 0);
5861 md_bitmap_flush(mddev
);
5863 if (mddev
->ro
== 0 &&
5864 ((!mddev
->in_sync
&& !mddev_is_clustered(mddev
)) ||
5866 /* mark array as shutdown cleanly */
5867 if (!mddev_is_clustered(mddev
))
5869 md_update_sb(mddev
, 1);
5873 void md_stop_writes(struct mddev
*mddev
)
5875 mddev_lock_nointr(mddev
);
5876 __md_stop_writes(mddev
);
5877 mddev_unlock(mddev
);
5879 EXPORT_SYMBOL_GPL(md_stop_writes
);
5881 static void mddev_detach(struct mddev
*mddev
)
5883 md_bitmap_wait_behind_writes(mddev
);
5884 if (mddev
->pers
&& mddev
->pers
->quiesce
) {
5885 mddev
->pers
->quiesce(mddev
, 1);
5886 mddev
->pers
->quiesce(mddev
, 0);
5888 md_unregister_thread(&mddev
->thread
);
5890 blk_sync_queue(mddev
->queue
); /* the unplug fn references 'conf'*/
5893 static void __md_stop(struct mddev
*mddev
)
5895 struct md_personality
*pers
= mddev
->pers
;
5896 md_bitmap_destroy(mddev
);
5897 mddev_detach(mddev
);
5898 /* Ensure ->event_work is done */
5899 flush_workqueue(md_misc_wq
);
5900 spin_lock(&mddev
->lock
);
5902 spin_unlock(&mddev
->lock
);
5903 pers
->free(mddev
, mddev
->private);
5904 mddev
->private = NULL
;
5905 if (pers
->sync_request
&& mddev
->to_remove
== NULL
)
5906 mddev
->to_remove
= &md_redundancy_group
;
5907 module_put(pers
->owner
);
5908 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5909 if (mddev
->flush_bio_pool
) {
5910 mempool_destroy(mddev
->flush_bio_pool
);
5911 mddev
->flush_bio_pool
= NULL
;
5913 if (mddev
->flush_pool
) {
5914 mempool_destroy(mddev
->flush_pool
);
5915 mddev
->flush_pool
= NULL
;
5919 void md_stop(struct mddev
*mddev
)
5921 /* stop the array and free an attached data structures.
5922 * This is called from dm-raid
5925 bioset_exit(&mddev
->bio_set
);
5926 bioset_exit(&mddev
->sync_set
);
5929 EXPORT_SYMBOL_GPL(md_stop
);
5931 static int md_set_readonly(struct mddev
*mddev
, struct block_device
*bdev
)
5936 if (!test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
)) {
5938 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5939 md_wakeup_thread(mddev
->thread
);
5941 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
5942 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5943 if (mddev
->sync_thread
)
5944 /* Thread might be blocked waiting for metadata update
5945 * which will now never happen */
5946 wake_up_process(mddev
->sync_thread
->tsk
);
5948 if (mddev
->external
&& test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
))
5950 mddev_unlock(mddev
);
5951 wait_event(resync_wait
, !test_bit(MD_RECOVERY_RUNNING
,
5953 wait_event(mddev
->sb_wait
,
5954 !test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
));
5955 mddev_lock_nointr(mddev
);
5957 mutex_lock(&mddev
->open_mutex
);
5958 if ((mddev
->pers
&& atomic_read(&mddev
->openers
) > !!bdev
) ||
5959 mddev
->sync_thread
||
5960 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
)) {
5961 pr_warn("md: %s still in use.\n",mdname(mddev
));
5963 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5964 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5965 md_wakeup_thread(mddev
->thread
);
5971 __md_stop_writes(mddev
);
5977 set_disk_ro(mddev
->gendisk
, 1);
5978 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5979 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5980 md_wakeup_thread(mddev
->thread
);
5981 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5985 mutex_unlock(&mddev
->open_mutex
);
5990 * 0 - completely stop and dis-assemble array
5991 * 2 - stop but do not disassemble array
5993 static int do_md_stop(struct mddev
*mddev
, int mode
,
5994 struct block_device
*bdev
)
5996 struct gendisk
*disk
= mddev
->gendisk
;
5997 struct md_rdev
*rdev
;
6000 if (!test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
)) {
6002 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
6003 md_wakeup_thread(mddev
->thread
);
6005 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
6006 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6007 if (mddev
->sync_thread
)
6008 /* Thread might be blocked waiting for metadata update
6009 * which will now never happen */
6010 wake_up_process(mddev
->sync_thread
->tsk
);
6012 mddev_unlock(mddev
);
6013 wait_event(resync_wait
, (mddev
->sync_thread
== NULL
&&
6014 !test_bit(MD_RECOVERY_RUNNING
,
6015 &mddev
->recovery
)));
6016 mddev_lock_nointr(mddev
);
6018 mutex_lock(&mddev
->open_mutex
);
6019 if ((mddev
->pers
&& atomic_read(&mddev
->openers
) > !!bdev
) ||
6020 mddev
->sysfs_active
||
6021 mddev
->sync_thread
||
6022 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
)) {
6023 pr_warn("md: %s still in use.\n",mdname(mddev
));
6024 mutex_unlock(&mddev
->open_mutex
);
6026 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
6027 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6028 md_wakeup_thread(mddev
->thread
);
6034 set_disk_ro(disk
, 0);
6036 __md_stop_writes(mddev
);
6038 mddev
->queue
->backing_dev_info
->congested_fn
= NULL
;
6040 /* tell userspace to handle 'inactive' */
6041 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6043 rdev_for_each(rdev
, mddev
)
6044 if (rdev
->raid_disk
>= 0)
6045 sysfs_unlink_rdev(mddev
, rdev
);
6047 set_capacity(disk
, 0);
6048 mutex_unlock(&mddev
->open_mutex
);
6050 revalidate_disk(disk
);
6055 mutex_unlock(&mddev
->open_mutex
);
6057 * Free resources if final stop
6060 pr_info("md: %s stopped.\n", mdname(mddev
));
6062 if (mddev
->bitmap_info
.file
) {
6063 struct file
*f
= mddev
->bitmap_info
.file
;
6064 spin_lock(&mddev
->lock
);
6065 mddev
->bitmap_info
.file
= NULL
;
6066 spin_unlock(&mddev
->lock
);
6069 mddev
->bitmap_info
.offset
= 0;
6071 export_array(mddev
);
6074 if (mddev
->hold_active
== UNTIL_STOP
)
6075 mddev
->hold_active
= 0;
6077 md_new_event(mddev
);
6078 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6083 static void autorun_array(struct mddev
*mddev
)
6085 struct md_rdev
*rdev
;
6088 if (list_empty(&mddev
->disks
))
6091 pr_info("md: running: ");
6093 rdev_for_each(rdev
, mddev
) {
6094 char b
[BDEVNAME_SIZE
];
6095 pr_cont("<%s>", bdevname(rdev
->bdev
,b
));
6099 err
= do_md_run(mddev
);
6101 pr_warn("md: do_md_run() returned %d\n", err
);
6102 do_md_stop(mddev
, 0, NULL
);
6107 * lets try to run arrays based on all disks that have arrived
6108 * until now. (those are in pending_raid_disks)
6110 * the method: pick the first pending disk, collect all disks with
6111 * the same UUID, remove all from the pending list and put them into
6112 * the 'same_array' list. Then order this list based on superblock
6113 * update time (freshest comes first), kick out 'old' disks and
6114 * compare superblocks. If everything's fine then run it.
6116 * If "unit" is allocated, then bump its reference count
6118 static void autorun_devices(int part
)
6120 struct md_rdev
*rdev0
, *rdev
, *tmp
;
6121 struct mddev
*mddev
;
6122 char b
[BDEVNAME_SIZE
];
6124 pr_info("md: autorun ...\n");
6125 while (!list_empty(&pending_raid_disks
)) {
6128 LIST_HEAD(candidates
);
6129 rdev0
= list_entry(pending_raid_disks
.next
,
6130 struct md_rdev
, same_set
);
6132 pr_debug("md: considering %s ...\n", bdevname(rdev0
->bdev
,b
));
6133 INIT_LIST_HEAD(&candidates
);
6134 rdev_for_each_list(rdev
, tmp
, &pending_raid_disks
)
6135 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
6136 pr_debug("md: adding %s ...\n",
6137 bdevname(rdev
->bdev
,b
));
6138 list_move(&rdev
->same_set
, &candidates
);
6141 * now we have a set of devices, with all of them having
6142 * mostly sane superblocks. It's time to allocate the
6146 dev
= MKDEV(mdp_major
,
6147 rdev0
->preferred_minor
<< MdpMinorShift
);
6148 unit
= MINOR(dev
) >> MdpMinorShift
;
6150 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
6153 if (rdev0
->preferred_minor
!= unit
) {
6154 pr_warn("md: unit number in %s is bad: %d\n",
6155 bdevname(rdev0
->bdev
, b
), rdev0
->preferred_minor
);
6159 md_probe(dev
, NULL
, NULL
);
6160 mddev
= mddev_find(dev
);
6161 if (!mddev
|| !mddev
->gendisk
) {
6166 if (mddev_lock(mddev
))
6167 pr_warn("md: %s locked, cannot run\n", mdname(mddev
));
6168 else if (mddev
->raid_disks
|| mddev
->major_version
6169 || !list_empty(&mddev
->disks
)) {
6170 pr_warn("md: %s already running, cannot run %s\n",
6171 mdname(mddev
), bdevname(rdev0
->bdev
,b
));
6172 mddev_unlock(mddev
);
6174 pr_debug("md: created %s\n", mdname(mddev
));
6175 mddev
->persistent
= 1;
6176 rdev_for_each_list(rdev
, tmp
, &candidates
) {
6177 list_del_init(&rdev
->same_set
);
6178 if (bind_rdev_to_array(rdev
, mddev
))
6181 autorun_array(mddev
);
6182 mddev_unlock(mddev
);
6184 /* on success, candidates will be empty, on error
6187 rdev_for_each_list(rdev
, tmp
, &candidates
) {
6188 list_del_init(&rdev
->same_set
);
6193 pr_info("md: ... autorun DONE.\n");
6195 #endif /* !MODULE */
6197 static int get_version(void __user
*arg
)
6201 ver
.major
= MD_MAJOR_VERSION
;
6202 ver
.minor
= MD_MINOR_VERSION
;
6203 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
6205 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
6211 static int get_array_info(struct mddev
*mddev
, void __user
*arg
)
6213 mdu_array_info_t info
;
6214 int nr
,working
,insync
,failed
,spare
;
6215 struct md_rdev
*rdev
;
6217 nr
= working
= insync
= failed
= spare
= 0;
6219 rdev_for_each_rcu(rdev
, mddev
) {
6221 if (test_bit(Faulty
, &rdev
->flags
))
6225 if (test_bit(In_sync
, &rdev
->flags
))
6227 else if (test_bit(Journal
, &rdev
->flags
))
6228 /* TODO: add journal count to md_u.h */
6236 info
.major_version
= mddev
->major_version
;
6237 info
.minor_version
= mddev
->minor_version
;
6238 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
6239 info
.ctime
= clamp_t(time64_t
, mddev
->ctime
, 0, U32_MAX
);
6240 info
.level
= mddev
->level
;
6241 info
.size
= mddev
->dev_sectors
/ 2;
6242 if (info
.size
!= mddev
->dev_sectors
/ 2) /* overflow */
6245 info
.raid_disks
= mddev
->raid_disks
;
6246 info
.md_minor
= mddev
->md_minor
;
6247 info
.not_persistent
= !mddev
->persistent
;
6249 info
.utime
= clamp_t(time64_t
, mddev
->utime
, 0, U32_MAX
);
6252 info
.state
= (1<<MD_SB_CLEAN
);
6253 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
6254 info
.state
|= (1<<MD_SB_BITMAP_PRESENT
);
6255 if (mddev_is_clustered(mddev
))
6256 info
.state
|= (1<<MD_SB_CLUSTERED
);
6257 info
.active_disks
= insync
;
6258 info
.working_disks
= working
;
6259 info
.failed_disks
= failed
;
6260 info
.spare_disks
= spare
;
6262 info
.layout
= mddev
->layout
;
6263 info
.chunk_size
= mddev
->chunk_sectors
<< 9;
6265 if (copy_to_user(arg
, &info
, sizeof(info
)))
6271 static int get_bitmap_file(struct mddev
*mddev
, void __user
* arg
)
6273 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
6277 file
= kzalloc(sizeof(*file
), GFP_NOIO
);
6282 spin_lock(&mddev
->lock
);
6283 /* bitmap enabled */
6284 if (mddev
->bitmap_info
.file
) {
6285 ptr
= file_path(mddev
->bitmap_info
.file
, file
->pathname
,
6286 sizeof(file
->pathname
));
6290 memmove(file
->pathname
, ptr
,
6291 sizeof(file
->pathname
)-(ptr
-file
->pathname
));
6293 spin_unlock(&mddev
->lock
);
6296 copy_to_user(arg
, file
, sizeof(*file
)))
6303 static int get_disk_info(struct mddev
*mddev
, void __user
* arg
)
6305 mdu_disk_info_t info
;
6306 struct md_rdev
*rdev
;
6308 if (copy_from_user(&info
, arg
, sizeof(info
)))
6312 rdev
= md_find_rdev_nr_rcu(mddev
, info
.number
);
6314 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
6315 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
6316 info
.raid_disk
= rdev
->raid_disk
;
6318 if (test_bit(Faulty
, &rdev
->flags
))
6319 info
.state
|= (1<<MD_DISK_FAULTY
);
6320 else if (test_bit(In_sync
, &rdev
->flags
)) {
6321 info
.state
|= (1<<MD_DISK_ACTIVE
);
6322 info
.state
|= (1<<MD_DISK_SYNC
);
6324 if (test_bit(Journal
, &rdev
->flags
))
6325 info
.state
|= (1<<MD_DISK_JOURNAL
);
6326 if (test_bit(WriteMostly
, &rdev
->flags
))
6327 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
6328 if (test_bit(FailFast
, &rdev
->flags
))
6329 info
.state
|= (1<<MD_DISK_FAILFAST
);
6331 info
.major
= info
.minor
= 0;
6332 info
.raid_disk
= -1;
6333 info
.state
= (1<<MD_DISK_REMOVED
);
6337 if (copy_to_user(arg
, &info
, sizeof(info
)))
6343 static int add_new_disk(struct mddev
*mddev
, mdu_disk_info_t
*info
)
6345 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
6346 struct md_rdev
*rdev
;
6347 dev_t dev
= MKDEV(info
->major
,info
->minor
);
6349 if (mddev_is_clustered(mddev
) &&
6350 !(info
->state
& ((1 << MD_DISK_CLUSTER_ADD
) | (1 << MD_DISK_CANDIDATE
)))) {
6351 pr_warn("%s: Cannot add to clustered mddev.\n",
6356 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
6359 if (!mddev
->raid_disks
) {
6361 /* expecting a device which has a superblock */
6362 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
6364 pr_warn("md: md_import_device returned %ld\n",
6366 return PTR_ERR(rdev
);
6368 if (!list_empty(&mddev
->disks
)) {
6369 struct md_rdev
*rdev0
6370 = list_entry(mddev
->disks
.next
,
6371 struct md_rdev
, same_set
);
6372 err
= super_types
[mddev
->major_version
]
6373 .load_super(rdev
, rdev0
, mddev
->minor_version
);
6375 pr_warn("md: %s has different UUID to %s\n",
6376 bdevname(rdev
->bdev
,b
),
6377 bdevname(rdev0
->bdev
,b2
));
6382 err
= bind_rdev_to_array(rdev
, mddev
);
6389 * add_new_disk can be used once the array is assembled
6390 * to add "hot spares". They must already have a superblock
6395 if (!mddev
->pers
->hot_add_disk
) {
6396 pr_warn("%s: personality does not support diskops!\n",
6400 if (mddev
->persistent
)
6401 rdev
= md_import_device(dev
, mddev
->major_version
,
6402 mddev
->minor_version
);
6404 rdev
= md_import_device(dev
, -1, -1);
6406 pr_warn("md: md_import_device returned %ld\n",
6408 return PTR_ERR(rdev
);
6410 /* set saved_raid_disk if appropriate */
6411 if (!mddev
->persistent
) {
6412 if (info
->state
& (1<<MD_DISK_SYNC
) &&
6413 info
->raid_disk
< mddev
->raid_disks
) {
6414 rdev
->raid_disk
= info
->raid_disk
;
6415 set_bit(In_sync
, &rdev
->flags
);
6416 clear_bit(Bitmap_sync
, &rdev
->flags
);
6418 rdev
->raid_disk
= -1;
6419 rdev
->saved_raid_disk
= rdev
->raid_disk
;
6421 super_types
[mddev
->major_version
].
6422 validate_super(mddev
, rdev
);
6423 if ((info
->state
& (1<<MD_DISK_SYNC
)) &&
6424 rdev
->raid_disk
!= info
->raid_disk
) {
6425 /* This was a hot-add request, but events doesn't
6426 * match, so reject it.
6432 clear_bit(In_sync
, &rdev
->flags
); /* just to be sure */
6433 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
6434 set_bit(WriteMostly
, &rdev
->flags
);
6436 clear_bit(WriteMostly
, &rdev
->flags
);
6437 if (info
->state
& (1<<MD_DISK_FAILFAST
))
6438 set_bit(FailFast
, &rdev
->flags
);
6440 clear_bit(FailFast
, &rdev
->flags
);
6442 if (info
->state
& (1<<MD_DISK_JOURNAL
)) {
6443 struct md_rdev
*rdev2
;
6444 bool has_journal
= false;
6446 /* make sure no existing journal disk */
6447 rdev_for_each(rdev2
, mddev
) {
6448 if (test_bit(Journal
, &rdev2
->flags
)) {
6453 if (has_journal
|| mddev
->bitmap
) {
6457 set_bit(Journal
, &rdev
->flags
);
6460 * check whether the device shows up in other nodes
6462 if (mddev_is_clustered(mddev
)) {
6463 if (info
->state
& (1 << MD_DISK_CANDIDATE
))
6464 set_bit(Candidate
, &rdev
->flags
);
6465 else if (info
->state
& (1 << MD_DISK_CLUSTER_ADD
)) {
6466 /* --add initiated by this node */
6467 err
= md_cluster_ops
->add_new_disk(mddev
, rdev
);
6475 rdev
->raid_disk
= -1;
6476 err
= bind_rdev_to_array(rdev
, mddev
);
6481 if (mddev_is_clustered(mddev
)) {
6482 if (info
->state
& (1 << MD_DISK_CANDIDATE
)) {
6484 err
= md_cluster_ops
->new_disk_ack(mddev
,
6487 md_kick_rdev_from_array(rdev
);
6491 md_cluster_ops
->add_new_disk_cancel(mddev
);
6493 err
= add_bound_rdev(rdev
);
6497 err
= add_bound_rdev(rdev
);
6502 /* otherwise, add_new_disk is only allowed
6503 * for major_version==0 superblocks
6505 if (mddev
->major_version
!= 0) {
6506 pr_warn("%s: ADD_NEW_DISK not supported\n", mdname(mddev
));
6510 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
6512 rdev
= md_import_device(dev
, -1, 0);
6514 pr_warn("md: error, md_import_device() returned %ld\n",
6516 return PTR_ERR(rdev
);
6518 rdev
->desc_nr
= info
->number
;
6519 if (info
->raid_disk
< mddev
->raid_disks
)
6520 rdev
->raid_disk
= info
->raid_disk
;
6522 rdev
->raid_disk
= -1;
6524 if (rdev
->raid_disk
< mddev
->raid_disks
)
6525 if (info
->state
& (1<<MD_DISK_SYNC
))
6526 set_bit(In_sync
, &rdev
->flags
);
6528 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
6529 set_bit(WriteMostly
, &rdev
->flags
);
6530 if (info
->state
& (1<<MD_DISK_FAILFAST
))
6531 set_bit(FailFast
, &rdev
->flags
);
6533 if (!mddev
->persistent
) {
6534 pr_debug("md: nonpersistent superblock ...\n");
6535 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
6537 rdev
->sb_start
= calc_dev_sboffset(rdev
);
6538 rdev
->sectors
= rdev
->sb_start
;
6540 err
= bind_rdev_to_array(rdev
, mddev
);
6550 static int hot_remove_disk(struct mddev
*mddev
, dev_t dev
)
6552 char b
[BDEVNAME_SIZE
];
6553 struct md_rdev
*rdev
;
6558 rdev
= find_rdev(mddev
, dev
);
6562 if (rdev
->raid_disk
< 0)
6565 clear_bit(Blocked
, &rdev
->flags
);
6566 remove_and_add_spares(mddev
, rdev
);
6568 if (rdev
->raid_disk
>= 0)
6572 if (mddev_is_clustered(mddev
))
6573 md_cluster_ops
->remove_disk(mddev
, rdev
);
6575 md_kick_rdev_from_array(rdev
);
6576 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
6578 md_wakeup_thread(mddev
->thread
);
6580 md_update_sb(mddev
, 1);
6581 md_new_event(mddev
);
6585 pr_debug("md: cannot remove active disk %s from %s ...\n",
6586 bdevname(rdev
->bdev
,b
), mdname(mddev
));
6590 static int hot_add_disk(struct mddev
*mddev
, dev_t dev
)
6592 char b
[BDEVNAME_SIZE
];
6594 struct md_rdev
*rdev
;
6599 if (mddev
->major_version
!= 0) {
6600 pr_warn("%s: HOT_ADD may only be used with version-0 superblocks.\n",
6604 if (!mddev
->pers
->hot_add_disk
) {
6605 pr_warn("%s: personality does not support diskops!\n",
6610 rdev
= md_import_device(dev
, -1, 0);
6612 pr_warn("md: error, md_import_device() returned %ld\n",
6617 if (mddev
->persistent
)
6618 rdev
->sb_start
= calc_dev_sboffset(rdev
);
6620 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
6622 rdev
->sectors
= rdev
->sb_start
;
6624 if (test_bit(Faulty
, &rdev
->flags
)) {
6625 pr_warn("md: can not hot-add faulty %s disk to %s!\n",
6626 bdevname(rdev
->bdev
,b
), mdname(mddev
));
6631 clear_bit(In_sync
, &rdev
->flags
);
6633 rdev
->saved_raid_disk
= -1;
6634 err
= bind_rdev_to_array(rdev
, mddev
);
6639 * The rest should better be atomic, we can have disk failures
6640 * noticed in interrupt contexts ...
6643 rdev
->raid_disk
= -1;
6645 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
6647 md_update_sb(mddev
, 1);
6649 * Kick recovery, maybe this spare has to be added to the
6650 * array immediately.
6652 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6653 md_wakeup_thread(mddev
->thread
);
6654 md_new_event(mddev
);
6662 static int set_bitmap_file(struct mddev
*mddev
, int fd
)
6667 if (!mddev
->pers
->quiesce
|| !mddev
->thread
)
6669 if (mddev
->recovery
|| mddev
->sync_thread
)
6671 /* we should be able to change the bitmap.. */
6675 struct inode
*inode
;
6678 if (mddev
->bitmap
|| mddev
->bitmap_info
.file
)
6679 return -EEXIST
; /* cannot add when bitmap is present */
6683 pr_warn("%s: error: failed to get bitmap file\n",
6688 inode
= f
->f_mapping
->host
;
6689 if (!S_ISREG(inode
->i_mode
)) {
6690 pr_warn("%s: error: bitmap file must be a regular file\n",
6693 } else if (!(f
->f_mode
& FMODE_WRITE
)) {
6694 pr_warn("%s: error: bitmap file must open for write\n",
6697 } else if (atomic_read(&inode
->i_writecount
) != 1) {
6698 pr_warn("%s: error: bitmap file is already in use\n",
6706 mddev
->bitmap_info
.file
= f
;
6707 mddev
->bitmap_info
.offset
= 0; /* file overrides offset */
6708 } else if (mddev
->bitmap
== NULL
)
6709 return -ENOENT
; /* cannot remove what isn't there */
6713 struct bitmap
*bitmap
;
6715 bitmap
= md_bitmap_create(mddev
, -1);
6716 mddev_suspend(mddev
);
6717 if (!IS_ERR(bitmap
)) {
6718 mddev
->bitmap
= bitmap
;
6719 err
= md_bitmap_load(mddev
);
6721 err
= PTR_ERR(bitmap
);
6723 md_bitmap_destroy(mddev
);
6726 mddev_resume(mddev
);
6727 } else if (fd
< 0) {
6728 mddev_suspend(mddev
);
6729 md_bitmap_destroy(mddev
);
6730 mddev_resume(mddev
);
6734 struct file
*f
= mddev
->bitmap_info
.file
;
6736 spin_lock(&mddev
->lock
);
6737 mddev
->bitmap_info
.file
= NULL
;
6738 spin_unlock(&mddev
->lock
);
6747 * set_array_info is used two different ways
6748 * The original usage is when creating a new array.
6749 * In this usage, raid_disks is > 0 and it together with
6750 * level, size, not_persistent,layout,chunksize determine the
6751 * shape of the array.
6752 * This will always create an array with a type-0.90.0 superblock.
6753 * The newer usage is when assembling an array.
6754 * In this case raid_disks will be 0, and the major_version field is
6755 * use to determine which style super-blocks are to be found on the devices.
6756 * The minor and patch _version numbers are also kept incase the
6757 * super_block handler wishes to interpret them.
6759 static int set_array_info(struct mddev
*mddev
, mdu_array_info_t
*info
)
6762 if (info
->raid_disks
== 0) {
6763 /* just setting version number for superblock loading */
6764 if (info
->major_version
< 0 ||
6765 info
->major_version
>= ARRAY_SIZE(super_types
) ||
6766 super_types
[info
->major_version
].name
== NULL
) {
6767 /* maybe try to auto-load a module? */
6768 pr_warn("md: superblock version %d not known\n",
6769 info
->major_version
);
6772 mddev
->major_version
= info
->major_version
;
6773 mddev
->minor_version
= info
->minor_version
;
6774 mddev
->patch_version
= info
->patch_version
;
6775 mddev
->persistent
= !info
->not_persistent
;
6776 /* ensure mddev_put doesn't delete this now that there
6777 * is some minimal configuration.
6779 mddev
->ctime
= ktime_get_real_seconds();
6782 mddev
->major_version
= MD_MAJOR_VERSION
;
6783 mddev
->minor_version
= MD_MINOR_VERSION
;
6784 mddev
->patch_version
= MD_PATCHLEVEL_VERSION
;
6785 mddev
->ctime
= ktime_get_real_seconds();
6787 mddev
->level
= info
->level
;
6788 mddev
->clevel
[0] = 0;
6789 mddev
->dev_sectors
= 2 * (sector_t
)info
->size
;
6790 mddev
->raid_disks
= info
->raid_disks
;
6791 /* don't set md_minor, it is determined by which /dev/md* was
6794 if (info
->state
& (1<<MD_SB_CLEAN
))
6795 mddev
->recovery_cp
= MaxSector
;
6797 mddev
->recovery_cp
= 0;
6798 mddev
->persistent
= ! info
->not_persistent
;
6799 mddev
->external
= 0;
6801 mddev
->layout
= info
->layout
;
6802 mddev
->chunk_sectors
= info
->chunk_size
>> 9;
6804 if (mddev
->persistent
) {
6805 mddev
->max_disks
= MD_SB_DISKS
;
6807 mddev
->sb_flags
= 0;
6809 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
6811 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
6812 mddev
->bitmap_info
.default_space
= 64*2 - (MD_SB_BYTES
>> 9);
6813 mddev
->bitmap_info
.offset
= 0;
6815 mddev
->reshape_position
= MaxSector
;
6818 * Generate a 128 bit UUID
6820 get_random_bytes(mddev
->uuid
, 16);
6822 mddev
->new_level
= mddev
->level
;
6823 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
6824 mddev
->new_layout
= mddev
->layout
;
6825 mddev
->delta_disks
= 0;
6826 mddev
->reshape_backwards
= 0;
6831 void md_set_array_sectors(struct mddev
*mddev
, sector_t array_sectors
)
6833 lockdep_assert_held(&mddev
->reconfig_mutex
);
6835 if (mddev
->external_size
)
6838 mddev
->array_sectors
= array_sectors
;
6840 EXPORT_SYMBOL(md_set_array_sectors
);
6842 static int update_size(struct mddev
*mddev
, sector_t num_sectors
)
6844 struct md_rdev
*rdev
;
6846 int fit
= (num_sectors
== 0);
6847 sector_t old_dev_sectors
= mddev
->dev_sectors
;
6849 if (mddev
->pers
->resize
== NULL
)
6851 /* The "num_sectors" is the number of sectors of each device that
6852 * is used. This can only make sense for arrays with redundancy.
6853 * linear and raid0 always use whatever space is available. We can only
6854 * consider changing this number if no resync or reconstruction is
6855 * happening, and if the new size is acceptable. It must fit before the
6856 * sb_start or, if that is <data_offset, it must fit before the size
6857 * of each device. If num_sectors is zero, we find the largest size
6860 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
6866 rdev_for_each(rdev
, mddev
) {
6867 sector_t avail
= rdev
->sectors
;
6869 if (fit
&& (num_sectors
== 0 || num_sectors
> avail
))
6870 num_sectors
= avail
;
6871 if (avail
< num_sectors
)
6874 rv
= mddev
->pers
->resize(mddev
, num_sectors
);
6876 if (mddev_is_clustered(mddev
))
6877 md_cluster_ops
->update_size(mddev
, old_dev_sectors
);
6878 else if (mddev
->queue
) {
6879 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
6880 revalidate_disk(mddev
->gendisk
);
6886 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
)
6889 struct md_rdev
*rdev
;
6890 /* change the number of raid disks */
6891 if (mddev
->pers
->check_reshape
== NULL
)
6895 if (raid_disks
<= 0 ||
6896 (mddev
->max_disks
&& raid_disks
>= mddev
->max_disks
))
6898 if (mddev
->sync_thread
||
6899 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
6900 mddev
->reshape_position
!= MaxSector
)
6903 rdev_for_each(rdev
, mddev
) {
6904 if (mddev
->raid_disks
< raid_disks
&&
6905 rdev
->data_offset
< rdev
->new_data_offset
)
6907 if (mddev
->raid_disks
> raid_disks
&&
6908 rdev
->data_offset
> rdev
->new_data_offset
)
6912 mddev
->delta_disks
= raid_disks
- mddev
->raid_disks
;
6913 if (mddev
->delta_disks
< 0)
6914 mddev
->reshape_backwards
= 1;
6915 else if (mddev
->delta_disks
> 0)
6916 mddev
->reshape_backwards
= 0;
6918 rv
= mddev
->pers
->check_reshape(mddev
);
6920 mddev
->delta_disks
= 0;
6921 mddev
->reshape_backwards
= 0;
6927 * update_array_info is used to change the configuration of an
6929 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
6930 * fields in the info are checked against the array.
6931 * Any differences that cannot be handled will cause an error.
6932 * Normally, only one change can be managed at a time.
6934 static int update_array_info(struct mddev
*mddev
, mdu_array_info_t
*info
)
6940 /* calculate expected state,ignoring low bits */
6941 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
6942 state
|= (1 << MD_SB_BITMAP_PRESENT
);
6944 if (mddev
->major_version
!= info
->major_version
||
6945 mddev
->minor_version
!= info
->minor_version
||
6946 /* mddev->patch_version != info->patch_version || */
6947 mddev
->ctime
!= info
->ctime
||
6948 mddev
->level
!= info
->level
||
6949 /* mddev->layout != info->layout || */
6950 mddev
->persistent
!= !info
->not_persistent
||
6951 mddev
->chunk_sectors
!= info
->chunk_size
>> 9 ||
6952 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
6953 ((state
^info
->state
) & 0xfffffe00)
6956 /* Check there is only one change */
6957 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
6959 if (mddev
->raid_disks
!= info
->raid_disks
)
6961 if (mddev
->layout
!= info
->layout
)
6963 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
))
6970 if (mddev
->layout
!= info
->layout
) {
6972 * we don't need to do anything at the md level, the
6973 * personality will take care of it all.
6975 if (mddev
->pers
->check_reshape
== NULL
)
6978 mddev
->new_layout
= info
->layout
;
6979 rv
= mddev
->pers
->check_reshape(mddev
);
6981 mddev
->new_layout
= mddev
->layout
;
6985 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
6986 rv
= update_size(mddev
, (sector_t
)info
->size
* 2);
6988 if (mddev
->raid_disks
!= info
->raid_disks
)
6989 rv
= update_raid_disks(mddev
, info
->raid_disks
);
6991 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) {
6992 if (mddev
->pers
->quiesce
== NULL
|| mddev
->thread
== NULL
) {
6996 if (mddev
->recovery
|| mddev
->sync_thread
) {
7000 if (info
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
7001 struct bitmap
*bitmap
;
7002 /* add the bitmap */
7003 if (mddev
->bitmap
) {
7007 if (mddev
->bitmap_info
.default_offset
== 0) {
7011 mddev
->bitmap_info
.offset
=
7012 mddev
->bitmap_info
.default_offset
;
7013 mddev
->bitmap_info
.space
=
7014 mddev
->bitmap_info
.default_space
;
7015 bitmap
= md_bitmap_create(mddev
, -1);
7016 mddev_suspend(mddev
);
7017 if (!IS_ERR(bitmap
)) {
7018 mddev
->bitmap
= bitmap
;
7019 rv
= md_bitmap_load(mddev
);
7021 rv
= PTR_ERR(bitmap
);
7023 md_bitmap_destroy(mddev
);
7024 mddev_resume(mddev
);
7026 /* remove the bitmap */
7027 if (!mddev
->bitmap
) {
7031 if (mddev
->bitmap
->storage
.file
) {
7035 if (mddev
->bitmap_info
.nodes
) {
7036 /* hold PW on all the bitmap lock */
7037 if (md_cluster_ops
->lock_all_bitmaps(mddev
) <= 0) {
7038 pr_warn("md: can't change bitmap to none since the array is in use by more than one node\n");
7040 md_cluster_ops
->unlock_all_bitmaps(mddev
);
7044 mddev
->bitmap_info
.nodes
= 0;
7045 md_cluster_ops
->leave(mddev
);
7047 mddev_suspend(mddev
);
7048 md_bitmap_destroy(mddev
);
7049 mddev_resume(mddev
);
7050 mddev
->bitmap_info
.offset
= 0;
7053 md_update_sb(mddev
, 1);
7059 static int set_disk_faulty(struct mddev
*mddev
, dev_t dev
)
7061 struct md_rdev
*rdev
;
7064 if (mddev
->pers
== NULL
)
7068 rdev
= md_find_rdev_rcu(mddev
, dev
);
7072 md_error(mddev
, rdev
);
7073 if (!test_bit(Faulty
, &rdev
->flags
))
7081 * We have a problem here : there is no easy way to give a CHS
7082 * virtual geometry. We currently pretend that we have a 2 heads
7083 * 4 sectors (with a BIG number of cylinders...). This drives
7084 * dosfs just mad... ;-)
7086 static int md_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
7088 struct mddev
*mddev
= bdev
->bd_disk
->private_data
;
7092 geo
->cylinders
= mddev
->array_sectors
/ 8;
7096 static inline bool md_ioctl_valid(unsigned int cmd
)
7101 case GET_ARRAY_INFO
:
7102 case GET_BITMAP_FILE
:
7105 case HOT_REMOVE_DISK
:
7108 case RESTART_ARRAY_RW
:
7110 case SET_ARRAY_INFO
:
7111 case SET_BITMAP_FILE
:
7112 case SET_DISK_FAULTY
:
7115 case CLUSTERED_DISK_NACK
:
7122 static int md_ioctl(struct block_device
*bdev
, fmode_t mode
,
7123 unsigned int cmd
, unsigned long arg
)
7126 void __user
*argp
= (void __user
*)arg
;
7127 struct mddev
*mddev
= NULL
;
7129 bool did_set_md_closing
= false;
7131 if (!md_ioctl_valid(cmd
))
7136 case GET_ARRAY_INFO
:
7140 if (!capable(CAP_SYS_ADMIN
))
7145 * Commands dealing with the RAID driver but not any
7150 err
= get_version(argp
);
7156 autostart_arrays(arg
);
7163 * Commands creating/starting a new array:
7166 mddev
= bdev
->bd_disk
->private_data
;
7173 /* Some actions do not requires the mutex */
7175 case GET_ARRAY_INFO
:
7176 if (!mddev
->raid_disks
&& !mddev
->external
)
7179 err
= get_array_info(mddev
, argp
);
7183 if (!mddev
->raid_disks
&& !mddev
->external
)
7186 err
= get_disk_info(mddev
, argp
);
7189 case SET_DISK_FAULTY
:
7190 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
7193 case GET_BITMAP_FILE
:
7194 err
= get_bitmap_file(mddev
, argp
);
7199 if (cmd
== ADD_NEW_DISK
)
7200 /* need to ensure md_delayed_delete() has completed */
7201 flush_workqueue(md_misc_wq
);
7203 if (cmd
== HOT_REMOVE_DISK
)
7204 /* need to ensure recovery thread has run */
7205 wait_event_interruptible_timeout(mddev
->sb_wait
,
7206 !test_bit(MD_RECOVERY_NEEDED
,
7208 msecs_to_jiffies(5000));
7209 if (cmd
== STOP_ARRAY
|| cmd
== STOP_ARRAY_RO
) {
7210 /* Need to flush page cache, and ensure no-one else opens
7213 mutex_lock(&mddev
->open_mutex
);
7214 if (mddev
->pers
&& atomic_read(&mddev
->openers
) > 1) {
7215 mutex_unlock(&mddev
->open_mutex
);
7219 WARN_ON_ONCE(test_bit(MD_CLOSING
, &mddev
->flags
));
7220 set_bit(MD_CLOSING
, &mddev
->flags
);
7221 did_set_md_closing
= true;
7222 mutex_unlock(&mddev
->open_mutex
);
7223 sync_blockdev(bdev
);
7225 err
= mddev_lock(mddev
);
7227 pr_debug("md: ioctl lock interrupted, reason %d, cmd %d\n",
7232 if (cmd
== SET_ARRAY_INFO
) {
7233 mdu_array_info_t info
;
7235 memset(&info
, 0, sizeof(info
));
7236 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
7241 err
= update_array_info(mddev
, &info
);
7243 pr_warn("md: couldn't update array info. %d\n", err
);
7248 if (!list_empty(&mddev
->disks
)) {
7249 pr_warn("md: array %s already has disks!\n", mdname(mddev
));
7253 if (mddev
->raid_disks
) {
7254 pr_warn("md: array %s already initialised!\n", mdname(mddev
));
7258 err
= set_array_info(mddev
, &info
);
7260 pr_warn("md: couldn't set array info. %d\n", err
);
7267 * Commands querying/configuring an existing array:
7269 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
7270 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
7271 if ((!mddev
->raid_disks
&& !mddev
->external
)
7272 && cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
7273 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
7274 && cmd
!= GET_BITMAP_FILE
) {
7280 * Commands even a read-only array can execute:
7283 case RESTART_ARRAY_RW
:
7284 err
= restart_array(mddev
);
7288 err
= do_md_stop(mddev
, 0, bdev
);
7292 err
= md_set_readonly(mddev
, bdev
);
7295 case HOT_REMOVE_DISK
:
7296 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
7300 /* We can support ADD_NEW_DISK on read-only arrays
7301 * only if we are re-adding a preexisting device.
7302 * So require mddev->pers and MD_DISK_SYNC.
7305 mdu_disk_info_t info
;
7306 if (copy_from_user(&info
, argp
, sizeof(info
)))
7308 else if (!(info
.state
& (1<<MD_DISK_SYNC
)))
7309 /* Need to clear read-only for this */
7312 err
= add_new_disk(mddev
, &info
);
7318 if (get_user(ro
, (int __user
*)(arg
))) {
7324 /* if the bdev is going readonly the value of mddev->ro
7325 * does not matter, no writes are coming
7330 /* are we are already prepared for writes? */
7334 /* transitioning to readauto need only happen for
7335 * arrays that call md_write_start
7338 err
= restart_array(mddev
);
7341 set_disk_ro(mddev
->gendisk
, 0);
7348 * The remaining ioctls are changing the state of the
7349 * superblock, so we do not allow them on read-only arrays.
7351 if (mddev
->ro
&& mddev
->pers
) {
7352 if (mddev
->ro
== 2) {
7354 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7355 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7356 /* mddev_unlock will wake thread */
7357 /* If a device failed while we were read-only, we
7358 * need to make sure the metadata is updated now.
7360 if (test_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
)) {
7361 mddev_unlock(mddev
);
7362 wait_event(mddev
->sb_wait
,
7363 !test_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
) &&
7364 !test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
));
7365 mddev_lock_nointr(mddev
);
7376 mdu_disk_info_t info
;
7377 if (copy_from_user(&info
, argp
, sizeof(info
)))
7380 err
= add_new_disk(mddev
, &info
);
7384 case CLUSTERED_DISK_NACK
:
7385 if (mddev_is_clustered(mddev
))
7386 md_cluster_ops
->new_disk_ack(mddev
, false);
7392 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
7396 err
= do_md_run(mddev
);
7399 case SET_BITMAP_FILE
:
7400 err
= set_bitmap_file(mddev
, (int)arg
);
7409 if (mddev
->hold_active
== UNTIL_IOCTL
&&
7411 mddev
->hold_active
= 0;
7412 mddev_unlock(mddev
);
7414 if(did_set_md_closing
)
7415 clear_bit(MD_CLOSING
, &mddev
->flags
);
7418 #ifdef CONFIG_COMPAT
7419 static int md_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
7420 unsigned int cmd
, unsigned long arg
)
7423 case HOT_REMOVE_DISK
:
7425 case SET_DISK_FAULTY
:
7426 case SET_BITMAP_FILE
:
7427 /* These take in integer arg, do not convert */
7430 arg
= (unsigned long)compat_ptr(arg
);
7434 return md_ioctl(bdev
, mode
, cmd
, arg
);
7436 #endif /* CONFIG_COMPAT */
7438 static int md_open(struct block_device
*bdev
, fmode_t mode
)
7441 * Succeed if we can lock the mddev, which confirms that
7442 * it isn't being stopped right now.
7444 struct mddev
*mddev
= mddev_find(bdev
->bd_dev
);
7450 if (mddev
->gendisk
!= bdev
->bd_disk
) {
7451 /* we are racing with mddev_put which is discarding this
7455 /* Wait until bdev->bd_disk is definitely gone */
7456 flush_workqueue(md_misc_wq
);
7457 /* Then retry the open from the top */
7458 return -ERESTARTSYS
;
7460 BUG_ON(mddev
!= bdev
->bd_disk
->private_data
);
7462 if ((err
= mutex_lock_interruptible(&mddev
->open_mutex
)))
7465 if (test_bit(MD_CLOSING
, &mddev
->flags
)) {
7466 mutex_unlock(&mddev
->open_mutex
);
7472 atomic_inc(&mddev
->openers
);
7473 mutex_unlock(&mddev
->open_mutex
);
7475 check_disk_change(bdev
);
7482 static void md_release(struct gendisk
*disk
, fmode_t mode
)
7484 struct mddev
*mddev
= disk
->private_data
;
7487 atomic_dec(&mddev
->openers
);
7491 static int md_media_changed(struct gendisk
*disk
)
7493 struct mddev
*mddev
= disk
->private_data
;
7495 return mddev
->changed
;
7498 static int md_revalidate(struct gendisk
*disk
)
7500 struct mddev
*mddev
= disk
->private_data
;
7505 static const struct block_device_operations md_fops
=
7507 .owner
= THIS_MODULE
,
7509 .release
= md_release
,
7511 #ifdef CONFIG_COMPAT
7512 .compat_ioctl
= md_compat_ioctl
,
7514 .getgeo
= md_getgeo
,
7515 .media_changed
= md_media_changed
,
7516 .revalidate_disk
= md_revalidate
,
7519 static int md_thread(void *arg
)
7521 struct md_thread
*thread
= arg
;
7524 * md_thread is a 'system-thread', it's priority should be very
7525 * high. We avoid resource deadlocks individually in each
7526 * raid personality. (RAID5 does preallocation) We also use RR and
7527 * the very same RT priority as kswapd, thus we will never get
7528 * into a priority inversion deadlock.
7530 * we definitely have to have equal or higher priority than
7531 * bdflush, otherwise bdflush will deadlock if there are too
7532 * many dirty RAID5 blocks.
7535 allow_signal(SIGKILL
);
7536 while (!kthread_should_stop()) {
7538 /* We need to wait INTERRUPTIBLE so that
7539 * we don't add to the load-average.
7540 * That means we need to be sure no signals are
7543 if (signal_pending(current
))
7544 flush_signals(current
);
7546 wait_event_interruptible_timeout
7548 test_bit(THREAD_WAKEUP
, &thread
->flags
)
7549 || kthread_should_stop() || kthread_should_park(),
7552 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
7553 if (kthread_should_park())
7555 if (!kthread_should_stop())
7556 thread
->run(thread
);
7562 void md_wakeup_thread(struct md_thread
*thread
)
7565 pr_debug("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
7566 set_bit(THREAD_WAKEUP
, &thread
->flags
);
7567 wake_up(&thread
->wqueue
);
7570 EXPORT_SYMBOL(md_wakeup_thread
);
7572 struct md_thread
*md_register_thread(void (*run
) (struct md_thread
*),
7573 struct mddev
*mddev
, const char *name
)
7575 struct md_thread
*thread
;
7577 thread
= kzalloc(sizeof(struct md_thread
), GFP_KERNEL
);
7581 init_waitqueue_head(&thread
->wqueue
);
7584 thread
->mddev
= mddev
;
7585 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
7586 thread
->tsk
= kthread_run(md_thread
, thread
,
7588 mdname(thread
->mddev
),
7590 if (IS_ERR(thread
->tsk
)) {
7596 EXPORT_SYMBOL(md_register_thread
);
7598 void md_unregister_thread(struct md_thread
**threadp
)
7600 struct md_thread
*thread
= *threadp
;
7603 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread
->tsk
));
7604 /* Locking ensures that mddev_unlock does not wake_up a
7605 * non-existent thread
7607 spin_lock(&pers_lock
);
7609 spin_unlock(&pers_lock
);
7611 kthread_stop(thread
->tsk
);
7614 EXPORT_SYMBOL(md_unregister_thread
);
7616 void md_error(struct mddev
*mddev
, struct md_rdev
*rdev
)
7618 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
7621 if (!mddev
->pers
|| !mddev
->pers
->error_handler
)
7623 mddev
->pers
->error_handler(mddev
,rdev
);
7624 if (mddev
->degraded
)
7625 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7626 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
7627 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7628 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7629 md_wakeup_thread(mddev
->thread
);
7630 if (mddev
->event_work
.func
)
7631 queue_work(md_misc_wq
, &mddev
->event_work
);
7632 md_new_event(mddev
);
7634 EXPORT_SYMBOL(md_error
);
7636 /* seq_file implementation /proc/mdstat */
7638 static void status_unused(struct seq_file
*seq
)
7641 struct md_rdev
*rdev
;
7643 seq_printf(seq
, "unused devices: ");
7645 list_for_each_entry(rdev
, &pending_raid_disks
, same_set
) {
7646 char b
[BDEVNAME_SIZE
];
7648 seq_printf(seq
, "%s ",
7649 bdevname(rdev
->bdev
,b
));
7652 seq_printf(seq
, "<none>");
7654 seq_printf(seq
, "\n");
7657 static int status_resync(struct seq_file
*seq
, struct mddev
*mddev
)
7659 sector_t max_sectors
, resync
, res
;
7660 unsigned long dt
, db
;
7663 unsigned int per_milli
;
7665 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
7666 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
7667 max_sectors
= mddev
->resync_max_sectors
;
7669 max_sectors
= mddev
->dev_sectors
;
7671 resync
= mddev
->curr_resync
;
7673 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
7674 /* Still cleaning up */
7675 resync
= max_sectors
;
7676 } else if (resync
> max_sectors
)
7677 resync
= max_sectors
;
7679 resync
-= atomic_read(&mddev
->recovery_active
);
7682 if (test_bit(MD_RESYNCING_REMOTE
, &mddev
->recovery
)) {
7683 struct md_rdev
*rdev
;
7685 rdev_for_each(rdev
, mddev
)
7686 if (rdev
->raid_disk
>= 0 &&
7687 !test_bit(Faulty
, &rdev
->flags
) &&
7688 rdev
->recovery_offset
!= MaxSector
&&
7689 rdev
->recovery_offset
) {
7690 seq_printf(seq
, "\trecover=REMOTE");
7693 if (mddev
->reshape_position
!= MaxSector
)
7694 seq_printf(seq
, "\treshape=REMOTE");
7696 seq_printf(seq
, "\tresync=REMOTE");
7699 if (mddev
->recovery_cp
< MaxSector
) {
7700 seq_printf(seq
, "\tresync=PENDING");
7706 seq_printf(seq
, "\tresync=DELAYED");
7710 WARN_ON(max_sectors
== 0);
7711 /* Pick 'scale' such that (resync>>scale)*1000 will fit
7712 * in a sector_t, and (max_sectors>>scale) will fit in a
7713 * u32, as those are the requirements for sector_div.
7714 * Thus 'scale' must be at least 10
7717 if (sizeof(sector_t
) > sizeof(unsigned long)) {
7718 while ( max_sectors
/2 > (1ULL<<(scale
+32)))
7721 res
= (resync
>>scale
)*1000;
7722 sector_div(res
, (u32
)((max_sectors
>>scale
)+1));
7726 int i
, x
= per_milli
/50, y
= 20-x
;
7727 seq_printf(seq
, "[");
7728 for (i
= 0; i
< x
; i
++)
7729 seq_printf(seq
, "=");
7730 seq_printf(seq
, ">");
7731 for (i
= 0; i
< y
; i
++)
7732 seq_printf(seq
, ".");
7733 seq_printf(seq
, "] ");
7735 seq_printf(seq
, " %s =%3u.%u%% (%llu/%llu)",
7736 (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)?
7738 (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)?
7740 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
7741 "resync" : "recovery"))),
7742 per_milli
/10, per_milli
% 10,
7743 (unsigned long long) resync
/2,
7744 (unsigned long long) max_sectors
/2);
7747 * dt: time from mark until now
7748 * db: blocks written from mark until now
7749 * rt: remaining time
7751 * rt is a sector_t, so could be 32bit or 64bit.
7752 * So we divide before multiply in case it is 32bit and close
7754 * We scale the divisor (db) by 32 to avoid losing precision
7755 * near the end of resync when the number of remaining sectors
7757 * We then divide rt by 32 after multiplying by db to compensate.
7758 * The '+1' avoids division by zero if db is very small.
7760 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
7762 db
= (mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
))
7763 - mddev
->resync_mark_cnt
;
7765 rt
= max_sectors
- resync
; /* number of remaining sectors */
7766 sector_div(rt
, db
/32+1);
7770 seq_printf(seq
, " finish=%lu.%lumin", (unsigned long)rt
/ 60,
7771 ((unsigned long)rt
% 60)/6);
7773 seq_printf(seq
, " speed=%ldK/sec", db
/2/dt
);
7777 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
7779 struct list_head
*tmp
;
7781 struct mddev
*mddev
;
7789 spin_lock(&all_mddevs_lock
);
7790 list_for_each(tmp
,&all_mddevs
)
7792 mddev
= list_entry(tmp
, struct mddev
, all_mddevs
);
7794 spin_unlock(&all_mddevs_lock
);
7797 spin_unlock(&all_mddevs_lock
);
7799 return (void*)2;/* tail */
7803 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
7805 struct list_head
*tmp
;
7806 struct mddev
*next_mddev
, *mddev
= v
;
7812 spin_lock(&all_mddevs_lock
);
7814 tmp
= all_mddevs
.next
;
7816 tmp
= mddev
->all_mddevs
.next
;
7817 if (tmp
!= &all_mddevs
)
7818 next_mddev
= mddev_get(list_entry(tmp
,struct mddev
,all_mddevs
));
7820 next_mddev
= (void*)2;
7823 spin_unlock(&all_mddevs_lock
);
7831 static void md_seq_stop(struct seq_file
*seq
, void *v
)
7833 struct mddev
*mddev
= v
;
7835 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
7839 static int md_seq_show(struct seq_file
*seq
, void *v
)
7841 struct mddev
*mddev
= v
;
7843 struct md_rdev
*rdev
;
7845 if (v
== (void*)1) {
7846 struct md_personality
*pers
;
7847 seq_printf(seq
, "Personalities : ");
7848 spin_lock(&pers_lock
);
7849 list_for_each_entry(pers
, &pers_list
, list
)
7850 seq_printf(seq
, "[%s] ", pers
->name
);
7852 spin_unlock(&pers_lock
);
7853 seq_printf(seq
, "\n");
7854 seq
->poll_event
= atomic_read(&md_event_count
);
7857 if (v
== (void*)2) {
7862 spin_lock(&mddev
->lock
);
7863 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
7864 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
7865 mddev
->pers
? "" : "in");
7868 seq_printf(seq
, " (read-only)");
7870 seq_printf(seq
, " (auto-read-only)");
7871 seq_printf(seq
, " %s", mddev
->pers
->name
);
7876 rdev_for_each_rcu(rdev
, mddev
) {
7877 char b
[BDEVNAME_SIZE
];
7878 seq_printf(seq
, " %s[%d]",
7879 bdevname(rdev
->bdev
,b
), rdev
->desc_nr
);
7880 if (test_bit(WriteMostly
, &rdev
->flags
))
7881 seq_printf(seq
, "(W)");
7882 if (test_bit(Journal
, &rdev
->flags
))
7883 seq_printf(seq
, "(J)");
7884 if (test_bit(Faulty
, &rdev
->flags
)) {
7885 seq_printf(seq
, "(F)");
7888 if (rdev
->raid_disk
< 0)
7889 seq_printf(seq
, "(S)"); /* spare */
7890 if (test_bit(Replacement
, &rdev
->flags
))
7891 seq_printf(seq
, "(R)");
7892 sectors
+= rdev
->sectors
;
7896 if (!list_empty(&mddev
->disks
)) {
7898 seq_printf(seq
, "\n %llu blocks",
7899 (unsigned long long)
7900 mddev
->array_sectors
/ 2);
7902 seq_printf(seq
, "\n %llu blocks",
7903 (unsigned long long)sectors
/ 2);
7905 if (mddev
->persistent
) {
7906 if (mddev
->major_version
!= 0 ||
7907 mddev
->minor_version
!= 90) {
7908 seq_printf(seq
," super %d.%d",
7909 mddev
->major_version
,
7910 mddev
->minor_version
);
7912 } else if (mddev
->external
)
7913 seq_printf(seq
, " super external:%s",
7914 mddev
->metadata_type
);
7916 seq_printf(seq
, " super non-persistent");
7919 mddev
->pers
->status(seq
, mddev
);
7920 seq_printf(seq
, "\n ");
7921 if (mddev
->pers
->sync_request
) {
7922 if (status_resync(seq
, mddev
))
7923 seq_printf(seq
, "\n ");
7926 seq_printf(seq
, "\n ");
7928 md_bitmap_status(seq
, mddev
->bitmap
);
7930 seq_printf(seq
, "\n");
7932 spin_unlock(&mddev
->lock
);
7937 static const struct seq_operations md_seq_ops
= {
7938 .start
= md_seq_start
,
7939 .next
= md_seq_next
,
7940 .stop
= md_seq_stop
,
7941 .show
= md_seq_show
,
7944 static int md_seq_open(struct inode
*inode
, struct file
*file
)
7946 struct seq_file
*seq
;
7949 error
= seq_open(file
, &md_seq_ops
);
7953 seq
= file
->private_data
;
7954 seq
->poll_event
= atomic_read(&md_event_count
);
7958 static int md_unloading
;
7959 static __poll_t
mdstat_poll(struct file
*filp
, poll_table
*wait
)
7961 struct seq_file
*seq
= filp
->private_data
;
7965 return EPOLLIN
|EPOLLRDNORM
|EPOLLERR
|EPOLLPRI
;
7966 poll_wait(filp
, &md_event_waiters
, wait
);
7968 /* always allow read */
7969 mask
= EPOLLIN
| EPOLLRDNORM
;
7971 if (seq
->poll_event
!= atomic_read(&md_event_count
))
7972 mask
|= EPOLLERR
| EPOLLPRI
;
7976 static const struct file_operations md_seq_fops
= {
7977 .owner
= THIS_MODULE
,
7978 .open
= md_seq_open
,
7980 .llseek
= seq_lseek
,
7981 .release
= seq_release
,
7982 .poll
= mdstat_poll
,
7985 int register_md_personality(struct md_personality
*p
)
7987 pr_debug("md: %s personality registered for level %d\n",
7989 spin_lock(&pers_lock
);
7990 list_add_tail(&p
->list
, &pers_list
);
7991 spin_unlock(&pers_lock
);
7994 EXPORT_SYMBOL(register_md_personality
);
7996 int unregister_md_personality(struct md_personality
*p
)
7998 pr_debug("md: %s personality unregistered\n", p
->name
);
7999 spin_lock(&pers_lock
);
8000 list_del_init(&p
->list
);
8001 spin_unlock(&pers_lock
);
8004 EXPORT_SYMBOL(unregister_md_personality
);
8006 int register_md_cluster_operations(struct md_cluster_operations
*ops
,
8007 struct module
*module
)
8010 spin_lock(&pers_lock
);
8011 if (md_cluster_ops
!= NULL
)
8014 md_cluster_ops
= ops
;
8015 md_cluster_mod
= module
;
8017 spin_unlock(&pers_lock
);
8020 EXPORT_SYMBOL(register_md_cluster_operations
);
8022 int unregister_md_cluster_operations(void)
8024 spin_lock(&pers_lock
);
8025 md_cluster_ops
= NULL
;
8026 spin_unlock(&pers_lock
);
8029 EXPORT_SYMBOL(unregister_md_cluster_operations
);
8031 int md_setup_cluster(struct mddev
*mddev
, int nodes
)
8033 if (!md_cluster_ops
)
8034 request_module("md-cluster");
8035 spin_lock(&pers_lock
);
8036 /* ensure module won't be unloaded */
8037 if (!md_cluster_ops
|| !try_module_get(md_cluster_mod
)) {
8038 pr_warn("can't find md-cluster module or get it's reference.\n");
8039 spin_unlock(&pers_lock
);
8042 spin_unlock(&pers_lock
);
8044 return md_cluster_ops
->join(mddev
, nodes
);
8047 void md_cluster_stop(struct mddev
*mddev
)
8049 if (!md_cluster_ops
)
8051 md_cluster_ops
->leave(mddev
);
8052 module_put(md_cluster_mod
);
8055 static int is_mddev_idle(struct mddev
*mddev
, int init
)
8057 struct md_rdev
*rdev
;
8063 rdev_for_each_rcu(rdev
, mddev
) {
8064 struct gendisk
*disk
= rdev
->bdev
->bd_contains
->bd_disk
;
8065 curr_events
= (int)part_stat_read_accum(&disk
->part0
, sectors
) -
8066 atomic_read(&disk
->sync_io
);
8067 /* sync IO will cause sync_io to increase before the disk_stats
8068 * as sync_io is counted when a request starts, and
8069 * disk_stats is counted when it completes.
8070 * So resync activity will cause curr_events to be smaller than
8071 * when there was no such activity.
8072 * non-sync IO will cause disk_stat to increase without
8073 * increasing sync_io so curr_events will (eventually)
8074 * be larger than it was before. Once it becomes
8075 * substantially larger, the test below will cause
8076 * the array to appear non-idle, and resync will slow
8078 * If there is a lot of outstanding resync activity when
8079 * we set last_event to curr_events, then all that activity
8080 * completing might cause the array to appear non-idle
8081 * and resync will be slowed down even though there might
8082 * not have been non-resync activity. This will only
8083 * happen once though. 'last_events' will soon reflect
8084 * the state where there is little or no outstanding
8085 * resync requests, and further resync activity will
8086 * always make curr_events less than last_events.
8089 if (init
|| curr_events
- rdev
->last_events
> 64) {
8090 rdev
->last_events
= curr_events
;
8098 void md_done_sync(struct mddev
*mddev
, int blocks
, int ok
)
8100 /* another "blocks" (512byte) blocks have been synced */
8101 atomic_sub(blocks
, &mddev
->recovery_active
);
8102 wake_up(&mddev
->recovery_wait
);
8104 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8105 set_bit(MD_RECOVERY_ERROR
, &mddev
->recovery
);
8106 md_wakeup_thread(mddev
->thread
);
8107 // stop recovery, signal do_sync ....
8110 EXPORT_SYMBOL(md_done_sync
);
8112 /* md_write_start(mddev, bi)
8113 * If we need to update some array metadata (e.g. 'active' flag
8114 * in superblock) before writing, schedule a superblock update
8115 * and wait for it to complete.
8116 * A return value of 'false' means that the write wasn't recorded
8117 * and cannot proceed as the array is being suspend.
8119 bool md_write_start(struct mddev
*mddev
, struct bio
*bi
)
8123 if (bio_data_dir(bi
) != WRITE
)
8126 BUG_ON(mddev
->ro
== 1);
8127 if (mddev
->ro
== 2) {
8128 /* need to switch to read/write */
8130 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
8131 md_wakeup_thread(mddev
->thread
);
8132 md_wakeup_thread(mddev
->sync_thread
);
8136 percpu_ref_get(&mddev
->writes_pending
);
8137 smp_mb(); /* Match smp_mb in set_in_sync() */
8138 if (mddev
->safemode
== 1)
8139 mddev
->safemode
= 0;
8140 /* sync_checkers is always 0 when writes_pending is in per-cpu mode */
8141 if (mddev
->in_sync
|| mddev
->sync_checkers
) {
8142 spin_lock(&mddev
->lock
);
8143 if (mddev
->in_sync
) {
8145 set_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
8146 set_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
8147 md_wakeup_thread(mddev
->thread
);
8150 spin_unlock(&mddev
->lock
);
8154 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
8155 if (!mddev
->has_superblocks
)
8157 wait_event(mddev
->sb_wait
,
8158 !test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
) ||
8160 if (test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
)) {
8161 percpu_ref_put(&mddev
->writes_pending
);
8166 EXPORT_SYMBOL(md_write_start
);
8168 /* md_write_inc can only be called when md_write_start() has
8169 * already been called at least once of the current request.
8170 * It increments the counter and is useful when a single request
8171 * is split into several parts. Each part causes an increment and
8172 * so needs a matching md_write_end().
8173 * Unlike md_write_start(), it is safe to call md_write_inc() inside
8174 * a spinlocked region.
8176 void md_write_inc(struct mddev
*mddev
, struct bio
*bi
)
8178 if (bio_data_dir(bi
) != WRITE
)
8180 WARN_ON_ONCE(mddev
->in_sync
|| mddev
->ro
);
8181 percpu_ref_get(&mddev
->writes_pending
);
8183 EXPORT_SYMBOL(md_write_inc
);
8185 void md_write_end(struct mddev
*mddev
)
8187 percpu_ref_put(&mddev
->writes_pending
);
8189 if (mddev
->safemode
== 2)
8190 md_wakeup_thread(mddev
->thread
);
8191 else if (mddev
->safemode_delay
)
8192 /* The roundup() ensures this only performs locking once
8193 * every ->safemode_delay jiffies
8195 mod_timer(&mddev
->safemode_timer
,
8196 roundup(jiffies
, mddev
->safemode_delay
) +
8197 mddev
->safemode_delay
);
8200 EXPORT_SYMBOL(md_write_end
);
8202 /* md_allow_write(mddev)
8203 * Calling this ensures that the array is marked 'active' so that writes
8204 * may proceed without blocking. It is important to call this before
8205 * attempting a GFP_KERNEL allocation while holding the mddev lock.
8206 * Must be called with mddev_lock held.
8208 void md_allow_write(struct mddev
*mddev
)
8214 if (!mddev
->pers
->sync_request
)
8217 spin_lock(&mddev
->lock
);
8218 if (mddev
->in_sync
) {
8220 set_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
8221 set_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
8222 if (mddev
->safemode_delay
&&
8223 mddev
->safemode
== 0)
8224 mddev
->safemode
= 1;
8225 spin_unlock(&mddev
->lock
);
8226 md_update_sb(mddev
, 0);
8227 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
8228 /* wait for the dirty state to be recorded in the metadata */
8229 wait_event(mddev
->sb_wait
,
8230 !test_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
));
8232 spin_unlock(&mddev
->lock
);
8234 EXPORT_SYMBOL_GPL(md_allow_write
);
8236 #define SYNC_MARKS 10
8237 #define SYNC_MARK_STEP (3*HZ)
8238 #define UPDATE_FREQUENCY (5*60*HZ)
8239 void md_do_sync(struct md_thread
*thread
)
8241 struct mddev
*mddev
= thread
->mddev
;
8242 struct mddev
*mddev2
;
8243 unsigned int currspeed
= 0,
8245 sector_t max_sectors
,j
, io_sectors
, recovery_done
;
8246 unsigned long mark
[SYNC_MARKS
];
8247 unsigned long update_time
;
8248 sector_t mark_cnt
[SYNC_MARKS
];
8250 struct list_head
*tmp
;
8251 sector_t last_check
;
8253 struct md_rdev
*rdev
;
8254 char *desc
, *action
= NULL
;
8255 struct blk_plug plug
;
8258 /* just incase thread restarts... */
8259 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
8260 test_bit(MD_RECOVERY_WAIT
, &mddev
->recovery
))
8262 if (mddev
->ro
) {/* never try to sync a read-only array */
8263 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8267 if (mddev_is_clustered(mddev
)) {
8268 ret
= md_cluster_ops
->resync_start(mddev
);
8272 set_bit(MD_CLUSTER_RESYNC_LOCKED
, &mddev
->flags
);
8273 if (!(test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
8274 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) ||
8275 test_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
))
8276 && ((unsigned long long)mddev
->curr_resync_completed
8277 < (unsigned long long)mddev
->resync_max_sectors
))
8281 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
8282 if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)) {
8283 desc
= "data-check";
8285 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
8286 desc
= "requested-resync";
8290 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
8295 mddev
->last_sync_action
= action
?: desc
;
8297 /* we overload curr_resync somewhat here.
8298 * 0 == not engaged in resync at all
8299 * 2 == checking that there is no conflict with another sync
8300 * 1 == like 2, but have yielded to allow conflicting resync to
8302 * other == active in resync - this many blocks
8304 * Before starting a resync we must have set curr_resync to
8305 * 2, and then checked that every "conflicting" array has curr_resync
8306 * less than ours. When we find one that is the same or higher
8307 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
8308 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
8309 * This will mean we have to start checking from the beginning again.
8314 int mddev2_minor
= -1;
8315 mddev
->curr_resync
= 2;
8318 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
8320 for_each_mddev(mddev2
, tmp
) {
8321 if (mddev2
== mddev
)
8323 if (!mddev
->parallel_resync
8324 && mddev2
->curr_resync
8325 && match_mddev_units(mddev
, mddev2
)) {
8327 if (mddev
< mddev2
&& mddev
->curr_resync
== 2) {
8328 /* arbitrarily yield */
8329 mddev
->curr_resync
= 1;
8330 wake_up(&resync_wait
);
8332 if (mddev
> mddev2
&& mddev
->curr_resync
== 1)
8333 /* no need to wait here, we can wait the next
8334 * time 'round when curr_resync == 2
8337 /* We need to wait 'interruptible' so as not to
8338 * contribute to the load average, and not to
8339 * be caught by 'softlockup'
8341 prepare_to_wait(&resync_wait
, &wq
, TASK_INTERRUPTIBLE
);
8342 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
8343 mddev2
->curr_resync
>= mddev
->curr_resync
) {
8344 if (mddev2_minor
!= mddev2
->md_minor
) {
8345 mddev2_minor
= mddev2
->md_minor
;
8346 pr_info("md: delaying %s of %s until %s has finished (they share one or more physical units)\n",
8347 desc
, mdname(mddev
),
8351 if (signal_pending(current
))
8352 flush_signals(current
);
8354 finish_wait(&resync_wait
, &wq
);
8357 finish_wait(&resync_wait
, &wq
);
8360 } while (mddev
->curr_resync
< 2);
8363 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
8364 /* resync follows the size requested by the personality,
8365 * which defaults to physical size, but can be virtual size
8367 max_sectors
= mddev
->resync_max_sectors
;
8368 atomic64_set(&mddev
->resync_mismatches
, 0);
8369 /* we don't use the checkpoint if there's a bitmap */
8370 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
8371 j
= mddev
->resync_min
;
8372 else if (!mddev
->bitmap
)
8373 j
= mddev
->recovery_cp
;
8375 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)) {
8376 max_sectors
= mddev
->resync_max_sectors
;
8378 * If the original node aborts reshaping then we continue the
8379 * reshaping, so set j again to avoid restart reshape from the
8382 if (mddev_is_clustered(mddev
) &&
8383 mddev
->reshape_position
!= MaxSector
)
8384 j
= mddev
->reshape_position
;
8386 /* recovery follows the physical size of devices */
8387 max_sectors
= mddev
->dev_sectors
;
8390 rdev_for_each_rcu(rdev
, mddev
)
8391 if (rdev
->raid_disk
>= 0 &&
8392 !test_bit(Journal
, &rdev
->flags
) &&
8393 !test_bit(Faulty
, &rdev
->flags
) &&
8394 !test_bit(In_sync
, &rdev
->flags
) &&
8395 rdev
->recovery_offset
< j
)
8396 j
= rdev
->recovery_offset
;
8399 /* If there is a bitmap, we need to make sure all
8400 * writes that started before we added a spare
8401 * complete before we start doing a recovery.
8402 * Otherwise the write might complete and (via
8403 * bitmap_endwrite) set a bit in the bitmap after the
8404 * recovery has checked that bit and skipped that
8407 if (mddev
->bitmap
) {
8408 mddev
->pers
->quiesce(mddev
, 1);
8409 mddev
->pers
->quiesce(mddev
, 0);
8413 pr_info("md: %s of RAID array %s\n", desc
, mdname(mddev
));
8414 pr_debug("md: minimum _guaranteed_ speed: %d KB/sec/disk.\n", speed_min(mddev
));
8415 pr_debug("md: using maximum available idle IO bandwidth (but not more than %d KB/sec) for %s.\n",
8416 speed_max(mddev
), desc
);
8418 is_mddev_idle(mddev
, 1); /* this initializes IO event counters */
8421 for (m
= 0; m
< SYNC_MARKS
; m
++) {
8423 mark_cnt
[m
] = io_sectors
;
8426 mddev
->resync_mark
= mark
[last_mark
];
8427 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
8430 * Tune reconstruction:
8432 window
= 32*(PAGE_SIZE
/512);
8433 pr_debug("md: using %dk window, over a total of %lluk.\n",
8434 window
/2, (unsigned long long)max_sectors
/2);
8436 atomic_set(&mddev
->recovery_active
, 0);
8440 pr_debug("md: resuming %s of %s from checkpoint.\n",
8441 desc
, mdname(mddev
));
8442 mddev
->curr_resync
= j
;
8444 mddev
->curr_resync
= 3; /* no longer delayed */
8445 mddev
->curr_resync_completed
= j
;
8446 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
8447 md_new_event(mddev
);
8448 update_time
= jiffies
;
8450 blk_start_plug(&plug
);
8451 while (j
< max_sectors
) {
8456 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
8457 ((mddev
->curr_resync
> mddev
->curr_resync_completed
&&
8458 (mddev
->curr_resync
- mddev
->curr_resync_completed
)
8459 > (max_sectors
>> 4)) ||
8460 time_after_eq(jiffies
, update_time
+ UPDATE_FREQUENCY
) ||
8461 (j
- mddev
->curr_resync_completed
)*2
8462 >= mddev
->resync_max
- mddev
->curr_resync_completed
||
8463 mddev
->curr_resync_completed
> mddev
->resync_max
8465 /* time to update curr_resync_completed */
8466 wait_event(mddev
->recovery_wait
,
8467 atomic_read(&mddev
->recovery_active
) == 0);
8468 mddev
->curr_resync_completed
= j
;
8469 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) &&
8470 j
> mddev
->recovery_cp
)
8471 mddev
->recovery_cp
= j
;
8472 update_time
= jiffies
;
8473 set_bit(MD_SB_CHANGE_CLEAN
, &mddev
->sb_flags
);
8474 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
8477 while (j
>= mddev
->resync_max
&&
8478 !test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
8479 /* As this condition is controlled by user-space,
8480 * we can block indefinitely, so use '_interruptible'
8481 * to avoid triggering warnings.
8483 flush_signals(current
); /* just in case */
8484 wait_event_interruptible(mddev
->recovery_wait
,
8485 mddev
->resync_max
> j
8486 || test_bit(MD_RECOVERY_INTR
,
8490 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
8493 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
);
8495 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8499 if (!skipped
) { /* actual IO requested */
8500 io_sectors
+= sectors
;
8501 atomic_add(sectors
, &mddev
->recovery_active
);
8504 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
8508 if (j
> max_sectors
)
8509 /* when skipping, extra large numbers can be returned. */
8512 mddev
->curr_resync
= j
;
8513 mddev
->curr_mark_cnt
= io_sectors
;
8514 if (last_check
== 0)
8515 /* this is the earliest that rebuild will be
8516 * visible in /proc/mdstat
8518 md_new_event(mddev
);
8520 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
8523 last_check
= io_sectors
;
8525 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
8527 int next
= (last_mark
+1) % SYNC_MARKS
;
8529 mddev
->resync_mark
= mark
[next
];
8530 mddev
->resync_mark_cnt
= mark_cnt
[next
];
8531 mark
[next
] = jiffies
;
8532 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
8536 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
8540 * this loop exits only if either when we are slower than
8541 * the 'hard' speed limit, or the system was IO-idle for
8543 * the system might be non-idle CPU-wise, but we only care
8544 * about not overloading the IO subsystem. (things like an
8545 * e2fsck being done on the RAID array should execute fast)
8549 recovery_done
= io_sectors
- atomic_read(&mddev
->recovery_active
);
8550 currspeed
= ((unsigned long)(recovery_done
- mddev
->resync_mark_cnt
))/2
8551 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
8553 if (currspeed
> speed_min(mddev
)) {
8554 if (currspeed
> speed_max(mddev
)) {
8558 if (!is_mddev_idle(mddev
, 0)) {
8560 * Give other IO more of a chance.
8561 * The faster the devices, the less we wait.
8563 wait_event(mddev
->recovery_wait
,
8564 !atomic_read(&mddev
->recovery_active
));
8568 pr_info("md: %s: %s %s.\n",mdname(mddev
), desc
,
8569 test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)
8570 ? "interrupted" : "done");
8572 * this also signals 'finished resyncing' to md_stop
8574 blk_finish_plug(&plug
);
8575 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
8577 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
8578 !test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
8579 mddev
->curr_resync
> 3) {
8580 mddev
->curr_resync_completed
= mddev
->curr_resync
;
8581 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
8583 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
);
8585 if (!test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
) &&
8586 mddev
->curr_resync
> 3) {
8587 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
8588 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
8589 if (mddev
->curr_resync
>= mddev
->recovery_cp
) {
8590 pr_debug("md: checkpointing %s of %s.\n",
8591 desc
, mdname(mddev
));
8592 if (test_bit(MD_RECOVERY_ERROR
,
8594 mddev
->recovery_cp
=
8595 mddev
->curr_resync_completed
;
8597 mddev
->recovery_cp
=
8601 mddev
->recovery_cp
= MaxSector
;
8603 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
8604 mddev
->curr_resync
= MaxSector
;
8605 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
8606 test_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
)) {
8608 rdev_for_each_rcu(rdev
, mddev
)
8609 if (rdev
->raid_disk
>= 0 &&
8610 mddev
->delta_disks
>= 0 &&
8611 !test_bit(Journal
, &rdev
->flags
) &&
8612 !test_bit(Faulty
, &rdev
->flags
) &&
8613 !test_bit(In_sync
, &rdev
->flags
) &&
8614 rdev
->recovery_offset
< mddev
->curr_resync
)
8615 rdev
->recovery_offset
= mddev
->curr_resync
;
8621 /* set CHANGE_PENDING here since maybe another update is needed,
8622 * so other nodes are informed. It should be harmless for normal
8624 set_mask_bits(&mddev
->sb_flags
, 0,
8625 BIT(MD_SB_CHANGE_PENDING
) | BIT(MD_SB_CHANGE_DEVS
));
8627 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
8628 !test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
8629 mddev
->delta_disks
> 0 &&
8630 mddev
->pers
->finish_reshape
&&
8631 mddev
->pers
->size
&&
8633 mddev_lock_nointr(mddev
);
8634 md_set_array_sectors(mddev
, mddev
->pers
->size(mddev
, 0, 0));
8635 mddev_unlock(mddev
);
8636 if (!mddev_is_clustered(mddev
)) {
8637 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
8638 revalidate_disk(mddev
->gendisk
);
8642 spin_lock(&mddev
->lock
);
8643 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
8644 /* We completed so min/max setting can be forgotten if used. */
8645 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
8646 mddev
->resync_min
= 0;
8647 mddev
->resync_max
= MaxSector
;
8648 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
8649 mddev
->resync_min
= mddev
->curr_resync_completed
;
8650 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
8651 mddev
->curr_resync
= 0;
8652 spin_unlock(&mddev
->lock
);
8654 wake_up(&resync_wait
);
8655 md_wakeup_thread(mddev
->thread
);
8658 EXPORT_SYMBOL_GPL(md_do_sync
);
8660 static int remove_and_add_spares(struct mddev
*mddev
,
8661 struct md_rdev
*this)
8663 struct md_rdev
*rdev
;
8666 bool remove_some
= false;
8668 if (this && test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
8669 /* Mustn't remove devices when resync thread is running */
8672 rdev_for_each(rdev
, mddev
) {
8673 if ((this == NULL
|| rdev
== this) &&
8674 rdev
->raid_disk
>= 0 &&
8675 !test_bit(Blocked
, &rdev
->flags
) &&
8676 test_bit(Faulty
, &rdev
->flags
) &&
8677 atomic_read(&rdev
->nr_pending
)==0) {
8678 /* Faulty non-Blocked devices with nr_pending == 0
8679 * never get nr_pending incremented,
8680 * never get Faulty cleared, and never get Blocked set.
8681 * So we can synchronize_rcu now rather than once per device
8684 set_bit(RemoveSynchronized
, &rdev
->flags
);
8690 rdev_for_each(rdev
, mddev
) {
8691 if ((this == NULL
|| rdev
== this) &&
8692 rdev
->raid_disk
>= 0 &&
8693 !test_bit(Blocked
, &rdev
->flags
) &&
8694 ((test_bit(RemoveSynchronized
, &rdev
->flags
) ||
8695 (!test_bit(In_sync
, &rdev
->flags
) &&
8696 !test_bit(Journal
, &rdev
->flags
))) &&
8697 atomic_read(&rdev
->nr_pending
)==0)) {
8698 if (mddev
->pers
->hot_remove_disk(
8699 mddev
, rdev
) == 0) {
8700 sysfs_unlink_rdev(mddev
, rdev
);
8701 rdev
->saved_raid_disk
= rdev
->raid_disk
;
8702 rdev
->raid_disk
= -1;
8706 if (remove_some
&& test_bit(RemoveSynchronized
, &rdev
->flags
))
8707 clear_bit(RemoveSynchronized
, &rdev
->flags
);
8710 if (removed
&& mddev
->kobj
.sd
)
8711 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
8713 if (this && removed
)
8716 rdev_for_each(rdev
, mddev
) {
8717 if (this && this != rdev
)
8719 if (test_bit(Candidate
, &rdev
->flags
))
8721 if (rdev
->raid_disk
>= 0 &&
8722 !test_bit(In_sync
, &rdev
->flags
) &&
8723 !test_bit(Journal
, &rdev
->flags
) &&
8724 !test_bit(Faulty
, &rdev
->flags
))
8726 if (rdev
->raid_disk
>= 0)
8728 if (test_bit(Faulty
, &rdev
->flags
))
8730 if (!test_bit(Journal
, &rdev
->flags
)) {
8732 ! (rdev
->saved_raid_disk
>= 0 &&
8733 !test_bit(Bitmap_sync
, &rdev
->flags
)))
8736 rdev
->recovery_offset
= 0;
8739 hot_add_disk(mddev
, rdev
) == 0) {
8740 if (sysfs_link_rdev(mddev
, rdev
))
8741 /* failure here is OK */;
8742 if (!test_bit(Journal
, &rdev
->flags
))
8744 md_new_event(mddev
);
8745 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
8750 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
8754 static void md_start_sync(struct work_struct
*ws
)
8756 struct mddev
*mddev
= container_of(ws
, struct mddev
, del_work
);
8758 mddev
->sync_thread
= md_register_thread(md_do_sync
,
8761 if (!mddev
->sync_thread
) {
8762 pr_warn("%s: could not start resync thread...\n",
8764 /* leave the spares where they are, it shouldn't hurt */
8765 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8766 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
8767 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
8768 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
8769 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8770 wake_up(&resync_wait
);
8771 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
8773 if (mddev
->sysfs_action
)
8774 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
8776 md_wakeup_thread(mddev
->sync_thread
);
8777 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
8778 md_new_event(mddev
);
8782 * This routine is regularly called by all per-raid-array threads to
8783 * deal with generic issues like resync and super-block update.
8784 * Raid personalities that don't have a thread (linear/raid0) do not
8785 * need this as they never do any recovery or update the superblock.
8787 * It does not do any resync itself, but rather "forks" off other threads
8788 * to do that as needed.
8789 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
8790 * "->recovery" and create a thread at ->sync_thread.
8791 * When the thread finishes it sets MD_RECOVERY_DONE
8792 * and wakeups up this thread which will reap the thread and finish up.
8793 * This thread also removes any faulty devices (with nr_pending == 0).
8795 * The overall approach is:
8796 * 1/ if the superblock needs updating, update it.
8797 * 2/ If a recovery thread is running, don't do anything else.
8798 * 3/ If recovery has finished, clean up, possibly marking spares active.
8799 * 4/ If there are any faulty devices, remove them.
8800 * 5/ If array is degraded, try to add spares devices
8801 * 6/ If array has spares or is not in-sync, start a resync thread.
8803 void md_check_recovery(struct mddev
*mddev
)
8805 if (test_bit(MD_ALLOW_SB_UPDATE
, &mddev
->flags
) && mddev
->sb_flags
) {
8806 /* Write superblock - thread that called mddev_suspend()
8807 * holds reconfig_mutex for us.
8809 set_bit(MD_UPDATING_SB
, &mddev
->flags
);
8810 smp_mb__after_atomic();
8811 if (test_bit(MD_ALLOW_SB_UPDATE
, &mddev
->flags
))
8812 md_update_sb(mddev
, 0);
8813 clear_bit_unlock(MD_UPDATING_SB
, &mddev
->flags
);
8814 wake_up(&mddev
->sb_wait
);
8817 if (mddev
->suspended
)
8821 md_bitmap_daemon_work(mddev
);
8823 if (signal_pending(current
)) {
8824 if (mddev
->pers
->sync_request
&& !mddev
->external
) {
8825 pr_debug("md: %s in immediate safe mode\n",
8827 mddev
->safemode
= 2;
8829 flush_signals(current
);
8832 if (mddev
->ro
&& !test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
8835 (mddev
->sb_flags
& ~ (1<<MD_SB_CHANGE_PENDING
)) ||
8836 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
8837 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
8838 (mddev
->external
== 0 && mddev
->safemode
== 1) ||
8839 (mddev
->safemode
== 2
8840 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
8844 if (mddev_trylock(mddev
)) {
8847 if (!mddev
->external
&& mddev
->safemode
== 1)
8848 mddev
->safemode
= 0;
8851 struct md_rdev
*rdev
;
8852 if (!mddev
->external
&& mddev
->in_sync
)
8853 /* 'Blocked' flag not needed as failed devices
8854 * will be recorded if array switched to read/write.
8855 * Leaving it set will prevent the device
8856 * from being removed.
8858 rdev_for_each(rdev
, mddev
)
8859 clear_bit(Blocked
, &rdev
->flags
);
8860 /* On a read-only array we can:
8861 * - remove failed devices
8862 * - add already-in_sync devices if the array itself
8864 * As we only add devices that are already in-sync,
8865 * we can activate the spares immediately.
8867 remove_and_add_spares(mddev
, NULL
);
8868 /* There is no thread, but we need to call
8869 * ->spare_active and clear saved_raid_disk
8871 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8872 md_reap_sync_thread(mddev
);
8873 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8874 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
8875 clear_bit(MD_SB_CHANGE_PENDING
, &mddev
->sb_flags
);
8879 if (mddev_is_clustered(mddev
)) {
8880 struct md_rdev
*rdev
;
8881 /* kick the device if another node issued a
8884 rdev_for_each(rdev
, mddev
) {
8885 if (test_and_clear_bit(ClusterRemove
, &rdev
->flags
) &&
8886 rdev
->raid_disk
< 0)
8887 md_kick_rdev_from_array(rdev
);
8891 if (!mddev
->external
&& !mddev
->in_sync
) {
8892 spin_lock(&mddev
->lock
);
8894 spin_unlock(&mddev
->lock
);
8897 if (mddev
->sb_flags
)
8898 md_update_sb(mddev
, 0);
8900 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
8901 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
8902 /* resync/recovery still happening */
8903 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
8906 if (mddev
->sync_thread
) {
8907 md_reap_sync_thread(mddev
);
8910 /* Set RUNNING before clearing NEEDED to avoid
8911 * any transients in the value of "sync_action".
8913 mddev
->curr_resync_completed
= 0;
8914 spin_lock(&mddev
->lock
);
8915 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8916 spin_unlock(&mddev
->lock
);
8917 /* Clear some bits that don't mean anything, but
8920 clear_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8921 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
8923 if (!test_and_clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
8924 test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
8926 /* no recovery is running.
8927 * remove any failed drives, then
8928 * add spares if possible.
8929 * Spares are also removed and re-added, to allow
8930 * the personality to fail the re-add.
8933 if (mddev
->reshape_position
!= MaxSector
) {
8934 if (mddev
->pers
->check_reshape
== NULL
||
8935 mddev
->pers
->check_reshape(mddev
) != 0)
8936 /* Cannot proceed */
8938 set_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
8939 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8940 } else if ((spares
= remove_and_add_spares(mddev
, NULL
))) {
8941 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8942 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
8943 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
8944 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8945 } else if (mddev
->recovery_cp
< MaxSector
) {
8946 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8947 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8948 } else if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
8949 /* nothing to be done ... */
8952 if (mddev
->pers
->sync_request
) {
8954 /* We are adding a device or devices to an array
8955 * which has the bitmap stored on all devices.
8956 * So make sure all bitmap pages get written
8958 md_bitmap_write_all(mddev
->bitmap
);
8960 INIT_WORK(&mddev
->del_work
, md_start_sync
);
8961 queue_work(md_misc_wq
, &mddev
->del_work
);
8965 if (!mddev
->sync_thread
) {
8966 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8967 wake_up(&resync_wait
);
8968 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
8970 if (mddev
->sysfs_action
)
8971 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
8974 wake_up(&mddev
->sb_wait
);
8975 mddev_unlock(mddev
);
8978 EXPORT_SYMBOL(md_check_recovery
);
8980 void md_reap_sync_thread(struct mddev
*mddev
)
8982 struct md_rdev
*rdev
;
8983 sector_t old_dev_sectors
= mddev
->dev_sectors
;
8984 bool is_reshaped
= false;
8986 /* resync has finished, collect result */
8987 md_unregister_thread(&mddev
->sync_thread
);
8988 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
8989 !test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
8991 /* activate any spares */
8992 if (mddev
->pers
->spare_active(mddev
)) {
8993 sysfs_notify(&mddev
->kobj
, NULL
,
8995 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
8998 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
8999 mddev
->pers
->finish_reshape
) {
9000 mddev
->pers
->finish_reshape(mddev
);
9001 if (mddev_is_clustered(mddev
))
9005 /* If array is no-longer degraded, then any saved_raid_disk
9006 * information must be scrapped.
9008 if (!mddev
->degraded
)
9009 rdev_for_each(rdev
, mddev
)
9010 rdev
->saved_raid_disk
= -1;
9012 md_update_sb(mddev
, 1);
9013 /* MD_SB_CHANGE_PENDING should be cleared by md_update_sb, so we can
9014 * call resync_finish here if MD_CLUSTER_RESYNC_LOCKED is set by
9016 if (test_and_clear_bit(MD_CLUSTER_RESYNC_LOCKED
, &mddev
->flags
))
9017 md_cluster_ops
->resync_finish(mddev
);
9018 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
9019 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
9020 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
9021 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
9022 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
9023 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
9025 * We call md_cluster_ops->update_size here because sync_size could
9026 * be changed by md_update_sb, and MD_RECOVERY_RESHAPE is cleared,
9027 * so it is time to update size across cluster.
9029 if (mddev_is_clustered(mddev
) && is_reshaped
9030 && !test_bit(MD_CLOSING
, &mddev
->flags
))
9031 md_cluster_ops
->update_size(mddev
, old_dev_sectors
);
9032 wake_up(&resync_wait
);
9033 /* flag recovery needed just to double check */
9034 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
9035 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
9036 md_new_event(mddev
);
9037 if (mddev
->event_work
.func
)
9038 queue_work(md_misc_wq
, &mddev
->event_work
);
9040 EXPORT_SYMBOL(md_reap_sync_thread
);
9042 void md_wait_for_blocked_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
9044 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
9045 wait_event_timeout(rdev
->blocked_wait
,
9046 !test_bit(Blocked
, &rdev
->flags
) &&
9047 !test_bit(BlockedBadBlocks
, &rdev
->flags
),
9048 msecs_to_jiffies(5000));
9049 rdev_dec_pending(rdev
, mddev
);
9051 EXPORT_SYMBOL(md_wait_for_blocked_rdev
);
9053 void md_finish_reshape(struct mddev
*mddev
)
9055 /* called be personality module when reshape completes. */
9056 struct md_rdev
*rdev
;
9058 rdev_for_each(rdev
, mddev
) {
9059 if (rdev
->data_offset
> rdev
->new_data_offset
)
9060 rdev
->sectors
+= rdev
->data_offset
- rdev
->new_data_offset
;
9062 rdev
->sectors
-= rdev
->new_data_offset
- rdev
->data_offset
;
9063 rdev
->data_offset
= rdev
->new_data_offset
;
9066 EXPORT_SYMBOL(md_finish_reshape
);
9068 /* Bad block management */
9070 /* Returns 1 on success, 0 on failure */
9071 int rdev_set_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
9074 struct mddev
*mddev
= rdev
->mddev
;
9077 s
+= rdev
->new_data_offset
;
9079 s
+= rdev
->data_offset
;
9080 rv
= badblocks_set(&rdev
->badblocks
, s
, sectors
, 0);
9082 /* Make sure they get written out promptly */
9083 if (test_bit(ExternalBbl
, &rdev
->flags
))
9084 sysfs_notify(&rdev
->kobj
, NULL
,
9085 "unacknowledged_bad_blocks");
9086 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
9087 set_mask_bits(&mddev
->sb_flags
, 0,
9088 BIT(MD_SB_CHANGE_CLEAN
) | BIT(MD_SB_CHANGE_PENDING
));
9089 md_wakeup_thread(rdev
->mddev
->thread
);
9094 EXPORT_SYMBOL_GPL(rdev_set_badblocks
);
9096 int rdev_clear_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
9101 s
+= rdev
->new_data_offset
;
9103 s
+= rdev
->data_offset
;
9104 rv
= badblocks_clear(&rdev
->badblocks
, s
, sectors
);
9105 if ((rv
== 0) && test_bit(ExternalBbl
, &rdev
->flags
))
9106 sysfs_notify(&rdev
->kobj
, NULL
, "bad_blocks");
9109 EXPORT_SYMBOL_GPL(rdev_clear_badblocks
);
9111 static int md_notify_reboot(struct notifier_block
*this,
9112 unsigned long code
, void *x
)
9114 struct list_head
*tmp
;
9115 struct mddev
*mddev
;
9118 for_each_mddev(mddev
, tmp
) {
9119 if (mddev_trylock(mddev
)) {
9121 __md_stop_writes(mddev
);
9122 if (mddev
->persistent
)
9123 mddev
->safemode
= 2;
9124 mddev_unlock(mddev
);
9129 * certain more exotic SCSI devices are known to be
9130 * volatile wrt too early system reboots. While the
9131 * right place to handle this issue is the given
9132 * driver, we do want to have a safe RAID driver ...
9140 static struct notifier_block md_notifier
= {
9141 .notifier_call
= md_notify_reboot
,
9143 .priority
= INT_MAX
, /* before any real devices */
9146 static void md_geninit(void)
9148 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
9150 proc_create("mdstat", S_IRUGO
, NULL
, &md_seq_fops
);
9153 static int __init
md_init(void)
9157 md_wq
= alloc_workqueue("md", WQ_MEM_RECLAIM
, 0);
9161 md_misc_wq
= alloc_workqueue("md_misc", 0, 0);
9165 if ((ret
= register_blkdev(MD_MAJOR
, "md")) < 0)
9168 if ((ret
= register_blkdev(0, "mdp")) < 0)
9172 blk_register_region(MKDEV(MD_MAJOR
, 0), 512, THIS_MODULE
,
9173 md_probe
, NULL
, NULL
);
9174 blk_register_region(MKDEV(mdp_major
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
9175 md_probe
, NULL
, NULL
);
9177 register_reboot_notifier(&md_notifier
);
9178 raid_table_header
= register_sysctl_table(raid_root_table
);
9184 unregister_blkdev(MD_MAJOR
, "md");
9186 destroy_workqueue(md_misc_wq
);
9188 destroy_workqueue(md_wq
);
9193 static void check_sb_changes(struct mddev
*mddev
, struct md_rdev
*rdev
)
9195 struct mdp_superblock_1
*sb
= page_address(rdev
->sb_page
);
9196 struct md_rdev
*rdev2
;
9198 char b
[BDEVNAME_SIZE
];
9201 * If size is changed in another node then we need to
9202 * do resize as well.
9204 if (mddev
->dev_sectors
!= le64_to_cpu(sb
->size
)) {
9205 ret
= mddev
->pers
->resize(mddev
, le64_to_cpu(sb
->size
));
9207 pr_info("md-cluster: resize failed\n");
9209 md_bitmap_update_sb(mddev
->bitmap
);
9212 /* Check for change of roles in the active devices */
9213 rdev_for_each(rdev2
, mddev
) {
9214 if (test_bit(Faulty
, &rdev2
->flags
))
9217 /* Check if the roles changed */
9218 role
= le16_to_cpu(sb
->dev_roles
[rdev2
->desc_nr
]);
9220 if (test_bit(Candidate
, &rdev2
->flags
)) {
9221 if (role
== 0xfffe) {
9222 pr_info("md: Removing Candidate device %s because add failed\n", bdevname(rdev2
->bdev
,b
));
9223 md_kick_rdev_from_array(rdev2
);
9227 clear_bit(Candidate
, &rdev2
->flags
);
9230 if (role
!= rdev2
->raid_disk
) {
9232 * got activated except reshape is happening.
9234 if (rdev2
->raid_disk
== -1 && role
!= 0xffff &&
9235 !(le32_to_cpu(sb
->feature_map
) &
9236 MD_FEATURE_RESHAPE_ACTIVE
)) {
9237 rdev2
->saved_raid_disk
= role
;
9238 ret
= remove_and_add_spares(mddev
, rdev2
);
9239 pr_info("Activated spare: %s\n",
9240 bdevname(rdev2
->bdev
,b
));
9241 /* wakeup mddev->thread here, so array could
9242 * perform resync with the new activated disk */
9243 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
9244 md_wakeup_thread(mddev
->thread
);
9248 * We just want to do the minimum to mark the disk
9249 * as faulty. The recovery is performed by the
9250 * one who initiated the error.
9252 if ((role
== 0xfffe) || (role
== 0xfffd)) {
9253 md_error(mddev
, rdev2
);
9254 clear_bit(Blocked
, &rdev2
->flags
);
9259 if (mddev
->raid_disks
!= le32_to_cpu(sb
->raid_disks
))
9260 update_raid_disks(mddev
, le32_to_cpu(sb
->raid_disks
));
9263 * Since mddev->delta_disks has already updated in update_raid_disks,
9264 * so it is time to check reshape.
9266 if (test_bit(MD_RESYNCING_REMOTE
, &mddev
->recovery
) &&
9267 (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
9269 * reshape is happening in the remote node, we need to
9270 * update reshape_position and call start_reshape.
9272 mddev
->reshape_position
= sb
->reshape_position
;
9273 if (mddev
->pers
->update_reshape_pos
)
9274 mddev
->pers
->update_reshape_pos(mddev
);
9275 if (mddev
->pers
->start_reshape
)
9276 mddev
->pers
->start_reshape(mddev
);
9277 } else if (test_bit(MD_RESYNCING_REMOTE
, &mddev
->recovery
) &&
9278 mddev
->reshape_position
!= MaxSector
&&
9279 !(le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
9280 /* reshape is just done in another node. */
9281 mddev
->reshape_position
= MaxSector
;
9282 if (mddev
->pers
->update_reshape_pos
)
9283 mddev
->pers
->update_reshape_pos(mddev
);
9286 /* Finally set the event to be up to date */
9287 mddev
->events
= le64_to_cpu(sb
->events
);
9290 static int read_rdev(struct mddev
*mddev
, struct md_rdev
*rdev
)
9293 struct page
*swapout
= rdev
->sb_page
;
9294 struct mdp_superblock_1
*sb
;
9296 /* Store the sb page of the rdev in the swapout temporary
9297 * variable in case we err in the future
9299 rdev
->sb_page
= NULL
;
9300 err
= alloc_disk_sb(rdev
);
9302 ClearPageUptodate(rdev
->sb_page
);
9303 rdev
->sb_loaded
= 0;
9304 err
= super_types
[mddev
->major_version
].
9305 load_super(rdev
, NULL
, mddev
->minor_version
);
9308 pr_warn("%s: %d Could not reload rdev(%d) err: %d. Restoring old values\n",
9309 __func__
, __LINE__
, rdev
->desc_nr
, err
);
9311 put_page(rdev
->sb_page
);
9312 rdev
->sb_page
= swapout
;
9313 rdev
->sb_loaded
= 1;
9317 sb
= page_address(rdev
->sb_page
);
9318 /* Read the offset unconditionally, even if MD_FEATURE_RECOVERY_OFFSET
9322 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RECOVERY_OFFSET
))
9323 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
9325 /* The other node finished recovery, call spare_active to set
9326 * device In_sync and mddev->degraded
9328 if (rdev
->recovery_offset
== MaxSector
&&
9329 !test_bit(In_sync
, &rdev
->flags
) &&
9330 mddev
->pers
->spare_active(mddev
))
9331 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
9337 void md_reload_sb(struct mddev
*mddev
, int nr
)
9339 struct md_rdev
*rdev
;
9343 rdev_for_each_rcu(rdev
, mddev
) {
9344 if (rdev
->desc_nr
== nr
)
9348 if (!rdev
|| rdev
->desc_nr
!= nr
) {
9349 pr_warn("%s: %d Could not find rdev with nr %d\n", __func__
, __LINE__
, nr
);
9353 err
= read_rdev(mddev
, rdev
);
9357 check_sb_changes(mddev
, rdev
);
9359 /* Read all rdev's to update recovery_offset */
9360 rdev_for_each_rcu(rdev
, mddev
) {
9361 if (!test_bit(Faulty
, &rdev
->flags
))
9362 read_rdev(mddev
, rdev
);
9365 EXPORT_SYMBOL(md_reload_sb
);
9370 * Searches all registered partitions for autorun RAID arrays
9374 static DEFINE_MUTEX(detected_devices_mutex
);
9375 static LIST_HEAD(all_detected_devices
);
9376 struct detected_devices_node
{
9377 struct list_head list
;
9381 void md_autodetect_dev(dev_t dev
)
9383 struct detected_devices_node
*node_detected_dev
;
9385 node_detected_dev
= kzalloc(sizeof(*node_detected_dev
), GFP_KERNEL
);
9386 if (node_detected_dev
) {
9387 node_detected_dev
->dev
= dev
;
9388 mutex_lock(&detected_devices_mutex
);
9389 list_add_tail(&node_detected_dev
->list
, &all_detected_devices
);
9390 mutex_unlock(&detected_devices_mutex
);
9394 static void autostart_arrays(int part
)
9396 struct md_rdev
*rdev
;
9397 struct detected_devices_node
*node_detected_dev
;
9399 int i_scanned
, i_passed
;
9404 pr_info("md: Autodetecting RAID arrays.\n");
9406 mutex_lock(&detected_devices_mutex
);
9407 while (!list_empty(&all_detected_devices
) && i_scanned
< INT_MAX
) {
9409 node_detected_dev
= list_entry(all_detected_devices
.next
,
9410 struct detected_devices_node
, list
);
9411 list_del(&node_detected_dev
->list
);
9412 dev
= node_detected_dev
->dev
;
9413 kfree(node_detected_dev
);
9414 mutex_unlock(&detected_devices_mutex
);
9415 rdev
= md_import_device(dev
,0, 90);
9416 mutex_lock(&detected_devices_mutex
);
9420 if (test_bit(Faulty
, &rdev
->flags
))
9423 set_bit(AutoDetected
, &rdev
->flags
);
9424 list_add(&rdev
->same_set
, &pending_raid_disks
);
9427 mutex_unlock(&detected_devices_mutex
);
9429 pr_debug("md: Scanned %d and added %d devices.\n", i_scanned
, i_passed
);
9431 autorun_devices(part
);
9434 #endif /* !MODULE */
9436 static __exit
void md_exit(void)
9438 struct mddev
*mddev
;
9439 struct list_head
*tmp
;
9442 blk_unregister_region(MKDEV(MD_MAJOR
,0), 512);
9443 blk_unregister_region(MKDEV(mdp_major
,0), 1U << MINORBITS
);
9445 unregister_blkdev(MD_MAJOR
,"md");
9446 unregister_blkdev(mdp_major
, "mdp");
9447 unregister_reboot_notifier(&md_notifier
);
9448 unregister_sysctl_table(raid_table_header
);
9450 /* We cannot unload the modules while some process is
9451 * waiting for us in select() or poll() - wake them up
9454 while (waitqueue_active(&md_event_waiters
)) {
9455 /* not safe to leave yet */
9456 wake_up(&md_event_waiters
);
9460 remove_proc_entry("mdstat", NULL
);
9462 for_each_mddev(mddev
, tmp
) {
9463 export_array(mddev
);
9465 mddev
->hold_active
= 0;
9467 * for_each_mddev() will call mddev_put() at the end of each
9468 * iteration. As the mddev is now fully clear, this will
9469 * schedule the mddev for destruction by a workqueue, and the
9470 * destroy_workqueue() below will wait for that to complete.
9473 destroy_workqueue(md_misc_wq
);
9474 destroy_workqueue(md_wq
);
9477 subsys_initcall(md_init
);
9478 module_exit(md_exit
)
9480 static int get_ro(char *buffer
, const struct kernel_param
*kp
)
9482 return sprintf(buffer
, "%d", start_readonly
);
9484 static int set_ro(const char *val
, const struct kernel_param
*kp
)
9486 return kstrtouint(val
, 10, (unsigned int *)&start_readonly
);
9489 module_param_call(start_ro
, set_ro
, get_ro
, NULL
, S_IRUSR
|S_IWUSR
);
9490 module_param(start_dirty_degraded
, int, S_IRUGO
|S_IWUSR
);
9491 module_param_call(new_array
, add_named_array
, NULL
, NULL
, S_IWUSR
);
9492 module_param(create_on_open
, bool, S_IRUSR
|S_IWUSR
);
9494 MODULE_LICENSE("GPL");
9495 MODULE_DESCRIPTION("MD RAID framework");
9497 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);