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.
35 #include <linux/kthread.h>
36 #include <linux/blkdev.h>
37 #include <linux/sysctl.h>
38 #include <linux/seq_file.h>
40 #include <linux/poll.h>
41 #include <linux/ctype.h>
42 #include <linux/string.h>
43 #include <linux/hdreg.h>
44 #include <linux/proc_fs.h>
45 #include <linux/random.h>
46 #include <linux/module.h>
47 #include <linux/reboot.h>
48 #include <linux/file.h>
49 #include <linux/compat.h>
50 #include <linux/delay.h>
51 #include <linux/raid/md_p.h>
52 #include <linux/raid/md_u.h>
53 #include <linux/slab.h>
58 static void autostart_arrays(int part
);
61 /* pers_list is a list of registered personalities protected
63 * pers_lock does extra service to protect accesses to
64 * mddev->thread when the mutex cannot be held.
66 static LIST_HEAD(pers_list
);
67 static DEFINE_SPINLOCK(pers_lock
);
69 static DECLARE_WAIT_QUEUE_HEAD(resync_wait
);
70 static struct workqueue_struct
*md_wq
;
71 static struct workqueue_struct
*md_misc_wq
;
73 static int remove_and_add_spares(struct mddev
*mddev
,
74 struct md_rdev
*this);
77 * Default number of read corrections we'll attempt on an rdev
78 * before ejecting it from the array. We divide the read error
79 * count by 2 for every hour elapsed between read errors.
81 #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
83 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
84 * is 1000 KB/sec, so the extra system load does not show up that much.
85 * Increase it if you want to have more _guaranteed_ speed. Note that
86 * the RAID driver will use the maximum available bandwidth if the IO
87 * subsystem is idle. There is also an 'absolute maximum' reconstruction
88 * speed limit - in case reconstruction slows down your system despite
91 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
92 * or /sys/block/mdX/md/sync_speed_{min,max}
95 static int sysctl_speed_limit_min
= 1000;
96 static int sysctl_speed_limit_max
= 200000;
97 static inline int speed_min(struct mddev
*mddev
)
99 return mddev
->sync_speed_min
?
100 mddev
->sync_speed_min
: sysctl_speed_limit_min
;
103 static inline int speed_max(struct mddev
*mddev
)
105 return mddev
->sync_speed_max
?
106 mddev
->sync_speed_max
: sysctl_speed_limit_max
;
109 static struct ctl_table_header
*raid_table_header
;
111 static struct ctl_table raid_table
[] = {
113 .procname
= "speed_limit_min",
114 .data
= &sysctl_speed_limit_min
,
115 .maxlen
= sizeof(int),
116 .mode
= S_IRUGO
|S_IWUSR
,
117 .proc_handler
= proc_dointvec
,
120 .procname
= "speed_limit_max",
121 .data
= &sysctl_speed_limit_max
,
122 .maxlen
= sizeof(int),
123 .mode
= S_IRUGO
|S_IWUSR
,
124 .proc_handler
= proc_dointvec
,
129 static struct ctl_table raid_dir_table
[] = {
133 .mode
= S_IRUGO
|S_IXUGO
,
139 static struct ctl_table raid_root_table
[] = {
144 .child
= raid_dir_table
,
149 static const struct block_device_operations md_fops
;
151 static int start_readonly
;
154 * like bio_clone, but with a local bio set
157 struct bio
*bio_alloc_mddev(gfp_t gfp_mask
, int nr_iovecs
,
162 if (!mddev
|| !mddev
->bio_set
)
163 return bio_alloc(gfp_mask
, nr_iovecs
);
165 b
= bio_alloc_bioset(gfp_mask
, nr_iovecs
, mddev
->bio_set
);
170 EXPORT_SYMBOL_GPL(bio_alloc_mddev
);
172 struct bio
*bio_clone_mddev(struct bio
*bio
, gfp_t gfp_mask
,
175 if (!mddev
|| !mddev
->bio_set
)
176 return bio_clone(bio
, gfp_mask
);
178 return bio_clone_bioset(bio
, gfp_mask
, mddev
->bio_set
);
180 EXPORT_SYMBOL_GPL(bio_clone_mddev
);
183 * We have a system wide 'event count' that is incremented
184 * on any 'interesting' event, and readers of /proc/mdstat
185 * can use 'poll' or 'select' to find out when the event
189 * start array, stop array, error, add device, remove device,
190 * start build, activate spare
192 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters
);
193 static atomic_t md_event_count
;
194 void md_new_event(struct mddev
*mddev
)
196 atomic_inc(&md_event_count
);
197 wake_up(&md_event_waiters
);
199 EXPORT_SYMBOL_GPL(md_new_event
);
201 /* Alternate version that can be called from interrupts
202 * when calling sysfs_notify isn't needed.
204 static void md_new_event_inintr(struct mddev
*mddev
)
206 atomic_inc(&md_event_count
);
207 wake_up(&md_event_waiters
);
211 * Enables to iterate over all existing md arrays
212 * all_mddevs_lock protects this list.
214 static LIST_HEAD(all_mddevs
);
215 static DEFINE_SPINLOCK(all_mddevs_lock
);
218 * iterates through all used mddevs in the system.
219 * We take care to grab the all_mddevs_lock whenever navigating
220 * the list, and to always hold a refcount when unlocked.
221 * Any code which breaks out of this loop while own
222 * a reference to the current mddev and must mddev_put it.
224 #define for_each_mddev(_mddev,_tmp) \
226 for (({ spin_lock(&all_mddevs_lock); \
227 _tmp = all_mddevs.next; \
229 ({ if (_tmp != &all_mddevs) \
230 mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\
231 spin_unlock(&all_mddevs_lock); \
232 if (_mddev) mddev_put(_mddev); \
233 _mddev = list_entry(_tmp, struct mddev, all_mddevs); \
234 _tmp != &all_mddevs;}); \
235 ({ spin_lock(&all_mddevs_lock); \
236 _tmp = _tmp->next;}) \
239 /* Rather than calling directly into the personality make_request function,
240 * IO requests come here first so that we can check if the device is
241 * being suspended pending a reconfiguration.
242 * We hold a refcount over the call to ->make_request. By the time that
243 * call has finished, the bio has been linked into some internal structure
244 * and so is visible to ->quiesce(), so we don't need the refcount any more.
246 static void md_make_request(struct request_queue
*q
, struct bio
*bio
)
248 const int rw
= bio_data_dir(bio
);
249 struct mddev
*mddev
= q
->queuedata
;
250 unsigned int sectors
;
252 if (mddev
== NULL
|| mddev
->pers
== NULL
257 if (mddev
->ro
== 1 && unlikely(rw
== WRITE
)) {
258 bio_endio(bio
, bio_sectors(bio
) == 0 ? 0 : -EROFS
);
261 smp_rmb(); /* Ensure implications of 'active' are visible */
263 if (mddev
->suspended
) {
266 prepare_to_wait(&mddev
->sb_wait
, &__wait
,
267 TASK_UNINTERRUPTIBLE
);
268 if (!mddev
->suspended
)
274 finish_wait(&mddev
->sb_wait
, &__wait
);
276 atomic_inc(&mddev
->active_io
);
280 * save the sectors now since our bio can
281 * go away inside make_request
283 sectors
= bio_sectors(bio
);
284 mddev
->pers
->make_request(mddev
, bio
);
286 generic_start_io_acct(rw
, sectors
, &mddev
->gendisk
->part0
);
288 if (atomic_dec_and_test(&mddev
->active_io
) && mddev
->suspended
)
289 wake_up(&mddev
->sb_wait
);
292 /* mddev_suspend makes sure no new requests are submitted
293 * to the device, and that any requests that have been submitted
294 * are completely handled.
295 * Once ->stop is called and completes, the module will be completely
298 void mddev_suspend(struct mddev
*mddev
)
300 BUG_ON(mddev
->suspended
);
301 mddev
->suspended
= 1;
303 wait_event(mddev
->sb_wait
, atomic_read(&mddev
->active_io
) == 0);
304 mddev
->pers
->quiesce(mddev
, 1);
306 del_timer_sync(&mddev
->safemode_timer
);
308 EXPORT_SYMBOL_GPL(mddev_suspend
);
310 void mddev_resume(struct mddev
*mddev
)
312 mddev
->suspended
= 0;
313 wake_up(&mddev
->sb_wait
);
314 mddev
->pers
->quiesce(mddev
, 0);
316 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
317 md_wakeup_thread(mddev
->thread
);
318 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
320 EXPORT_SYMBOL_GPL(mddev_resume
);
322 int mddev_congested(struct mddev
*mddev
, int bits
)
324 return mddev
->suspended
;
326 EXPORT_SYMBOL(mddev_congested
);
329 * Generic flush handling for md
332 static void md_end_flush(struct bio
*bio
, int err
)
334 struct md_rdev
*rdev
= bio
->bi_private
;
335 struct mddev
*mddev
= rdev
->mddev
;
337 rdev_dec_pending(rdev
, mddev
);
339 if (atomic_dec_and_test(&mddev
->flush_pending
)) {
340 /* The pre-request flush has finished */
341 queue_work(md_wq
, &mddev
->flush_work
);
346 static void md_submit_flush_data(struct work_struct
*ws
);
348 static void submit_flushes(struct work_struct
*ws
)
350 struct mddev
*mddev
= container_of(ws
, struct mddev
, flush_work
);
351 struct md_rdev
*rdev
;
353 INIT_WORK(&mddev
->flush_work
, md_submit_flush_data
);
354 atomic_set(&mddev
->flush_pending
, 1);
356 rdev_for_each_rcu(rdev
, mddev
)
357 if (rdev
->raid_disk
>= 0 &&
358 !test_bit(Faulty
, &rdev
->flags
)) {
359 /* Take two references, one is dropped
360 * when request finishes, one after
361 * we reclaim rcu_read_lock
364 atomic_inc(&rdev
->nr_pending
);
365 atomic_inc(&rdev
->nr_pending
);
367 bi
= bio_alloc_mddev(GFP_NOIO
, 0, mddev
);
368 bi
->bi_end_io
= md_end_flush
;
369 bi
->bi_private
= rdev
;
370 bi
->bi_bdev
= rdev
->bdev
;
371 atomic_inc(&mddev
->flush_pending
);
372 submit_bio(WRITE_FLUSH
, bi
);
374 rdev_dec_pending(rdev
, mddev
);
377 if (atomic_dec_and_test(&mddev
->flush_pending
))
378 queue_work(md_wq
, &mddev
->flush_work
);
381 static void md_submit_flush_data(struct work_struct
*ws
)
383 struct mddev
*mddev
= container_of(ws
, struct mddev
, flush_work
);
384 struct bio
*bio
= mddev
->flush_bio
;
386 if (bio
->bi_iter
.bi_size
== 0)
387 /* an empty barrier - all done */
390 bio
->bi_rw
&= ~REQ_FLUSH
;
391 mddev
->pers
->make_request(mddev
, bio
);
394 mddev
->flush_bio
= NULL
;
395 wake_up(&mddev
->sb_wait
);
398 void md_flush_request(struct mddev
*mddev
, struct bio
*bio
)
400 spin_lock_irq(&mddev
->write_lock
);
401 wait_event_lock_irq(mddev
->sb_wait
,
404 mddev
->flush_bio
= bio
;
405 spin_unlock_irq(&mddev
->write_lock
);
407 INIT_WORK(&mddev
->flush_work
, submit_flushes
);
408 queue_work(md_wq
, &mddev
->flush_work
);
410 EXPORT_SYMBOL(md_flush_request
);
412 void md_unplug(struct blk_plug_cb
*cb
, bool from_schedule
)
414 struct mddev
*mddev
= cb
->data
;
415 md_wakeup_thread(mddev
->thread
);
418 EXPORT_SYMBOL(md_unplug
);
420 static inline struct mddev
*mddev_get(struct mddev
*mddev
)
422 atomic_inc(&mddev
->active
);
426 static void mddev_delayed_delete(struct work_struct
*ws
);
428 static void mddev_put(struct mddev
*mddev
)
430 struct bio_set
*bs
= NULL
;
432 if (!atomic_dec_and_lock(&mddev
->active
, &all_mddevs_lock
))
434 if (!mddev
->raid_disks
&& list_empty(&mddev
->disks
) &&
435 mddev
->ctime
== 0 && !mddev
->hold_active
) {
436 /* Array is not configured at all, and not held active,
438 list_del_init(&mddev
->all_mddevs
);
440 mddev
->bio_set
= NULL
;
441 if (mddev
->gendisk
) {
442 /* We did a probe so need to clean up. Call
443 * queue_work inside the spinlock so that
444 * flush_workqueue() after mddev_find will
445 * succeed in waiting for the work to be done.
447 INIT_WORK(&mddev
->del_work
, mddev_delayed_delete
);
448 queue_work(md_misc_wq
, &mddev
->del_work
);
452 spin_unlock(&all_mddevs_lock
);
457 void mddev_init(struct mddev
*mddev
)
459 mutex_init(&mddev
->open_mutex
);
460 mutex_init(&mddev
->reconfig_mutex
);
461 mutex_init(&mddev
->bitmap_info
.mutex
);
462 INIT_LIST_HEAD(&mddev
->disks
);
463 INIT_LIST_HEAD(&mddev
->all_mddevs
);
464 init_timer(&mddev
->safemode_timer
);
465 atomic_set(&mddev
->active
, 1);
466 atomic_set(&mddev
->openers
, 0);
467 atomic_set(&mddev
->active_io
, 0);
468 spin_lock_init(&mddev
->write_lock
);
469 atomic_set(&mddev
->flush_pending
, 0);
470 init_waitqueue_head(&mddev
->sb_wait
);
471 init_waitqueue_head(&mddev
->recovery_wait
);
472 mddev
->reshape_position
= MaxSector
;
473 mddev
->reshape_backwards
= 0;
474 mddev
->last_sync_action
= "none";
475 mddev
->resync_min
= 0;
476 mddev
->resync_max
= MaxSector
;
477 mddev
->level
= LEVEL_NONE
;
479 EXPORT_SYMBOL_GPL(mddev_init
);
481 static struct mddev
*mddev_find(dev_t unit
)
483 struct mddev
*mddev
, *new = NULL
;
485 if (unit
&& MAJOR(unit
) != MD_MAJOR
)
486 unit
&= ~((1<<MdpMinorShift
)-1);
489 spin_lock(&all_mddevs_lock
);
492 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
493 if (mddev
->unit
== unit
) {
495 spin_unlock(&all_mddevs_lock
);
501 list_add(&new->all_mddevs
, &all_mddevs
);
502 spin_unlock(&all_mddevs_lock
);
503 new->hold_active
= UNTIL_IOCTL
;
507 /* find an unused unit number */
508 static int next_minor
= 512;
509 int start
= next_minor
;
513 dev
= MKDEV(MD_MAJOR
, next_minor
);
515 if (next_minor
> MINORMASK
)
517 if (next_minor
== start
) {
518 /* Oh dear, all in use. */
519 spin_unlock(&all_mddevs_lock
);
525 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
526 if (mddev
->unit
== dev
) {
532 new->md_minor
= MINOR(dev
);
533 new->hold_active
= UNTIL_STOP
;
534 list_add(&new->all_mddevs
, &all_mddevs
);
535 spin_unlock(&all_mddevs_lock
);
538 spin_unlock(&all_mddevs_lock
);
540 new = kzalloc(sizeof(*new), GFP_KERNEL
);
545 if (MAJOR(unit
) == MD_MAJOR
)
546 new->md_minor
= MINOR(unit
);
548 new->md_minor
= MINOR(unit
) >> MdpMinorShift
;
555 static inline int __must_check
mddev_lock(struct mddev
*mddev
)
557 return mutex_lock_interruptible(&mddev
->reconfig_mutex
);
560 /* Sometimes we need to take the lock in a situation where
561 * failure due to interrupts is not acceptable.
563 static inline void mddev_lock_nointr(struct mddev
*mddev
)
565 mutex_lock(&mddev
->reconfig_mutex
);
568 static inline int mddev_is_locked(struct mddev
*mddev
)
570 return mutex_is_locked(&mddev
->reconfig_mutex
);
573 static inline int mddev_trylock(struct mddev
*mddev
)
575 return mutex_trylock(&mddev
->reconfig_mutex
);
578 static struct attribute_group md_redundancy_group
;
580 static void mddev_unlock(struct mddev
*mddev
)
582 if (mddev
->to_remove
) {
583 /* These cannot be removed under reconfig_mutex as
584 * an access to the files will try to take reconfig_mutex
585 * while holding the file unremovable, which leads to
587 * So hold set sysfs_active while the remove in happeing,
588 * and anything else which might set ->to_remove or my
589 * otherwise change the sysfs namespace will fail with
590 * -EBUSY if sysfs_active is still set.
591 * We set sysfs_active under reconfig_mutex and elsewhere
592 * test it under the same mutex to ensure its correct value
595 struct attribute_group
*to_remove
= mddev
->to_remove
;
596 mddev
->to_remove
= NULL
;
597 mddev
->sysfs_active
= 1;
598 mutex_unlock(&mddev
->reconfig_mutex
);
600 if (mddev
->kobj
.sd
) {
601 if (to_remove
!= &md_redundancy_group
)
602 sysfs_remove_group(&mddev
->kobj
, to_remove
);
603 if (mddev
->pers
== NULL
||
604 mddev
->pers
->sync_request
== NULL
) {
605 sysfs_remove_group(&mddev
->kobj
, &md_redundancy_group
);
606 if (mddev
->sysfs_action
)
607 sysfs_put(mddev
->sysfs_action
);
608 mddev
->sysfs_action
= NULL
;
611 mddev
->sysfs_active
= 0;
613 mutex_unlock(&mddev
->reconfig_mutex
);
615 /* As we've dropped the mutex we need a spinlock to
616 * make sure the thread doesn't disappear
618 spin_lock(&pers_lock
);
619 md_wakeup_thread(mddev
->thread
);
620 spin_unlock(&pers_lock
);
623 static struct md_rdev
*find_rdev_nr_rcu(struct mddev
*mddev
, int nr
)
625 struct md_rdev
*rdev
;
627 rdev_for_each_rcu(rdev
, mddev
)
628 if (rdev
->desc_nr
== nr
)
634 static struct md_rdev
*find_rdev(struct mddev
*mddev
, dev_t dev
)
636 struct md_rdev
*rdev
;
638 rdev_for_each(rdev
, mddev
)
639 if (rdev
->bdev
->bd_dev
== dev
)
645 static struct md_rdev
*find_rdev_rcu(struct mddev
*mddev
, dev_t dev
)
647 struct md_rdev
*rdev
;
649 rdev_for_each_rcu(rdev
, mddev
)
650 if (rdev
->bdev
->bd_dev
== dev
)
656 static struct md_personality
*find_pers(int level
, char *clevel
)
658 struct md_personality
*pers
;
659 list_for_each_entry(pers
, &pers_list
, list
) {
660 if (level
!= LEVEL_NONE
&& pers
->level
== level
)
662 if (strcmp(pers
->name
, clevel
)==0)
668 /* return the offset of the super block in 512byte sectors */
669 static inline sector_t
calc_dev_sboffset(struct md_rdev
*rdev
)
671 sector_t num_sectors
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
672 return MD_NEW_SIZE_SECTORS(num_sectors
);
675 static int alloc_disk_sb(struct md_rdev
*rdev
)
677 rdev
->sb_page
= alloc_page(GFP_KERNEL
);
678 if (!rdev
->sb_page
) {
679 printk(KERN_ALERT
"md: out of memory.\n");
686 void md_rdev_clear(struct md_rdev
*rdev
)
689 put_page(rdev
->sb_page
);
691 rdev
->sb_page
= NULL
;
696 put_page(rdev
->bb_page
);
697 rdev
->bb_page
= NULL
;
699 kfree(rdev
->badblocks
.page
);
700 rdev
->badblocks
.page
= NULL
;
702 EXPORT_SYMBOL_GPL(md_rdev_clear
);
704 static void super_written(struct bio
*bio
, int error
)
706 struct md_rdev
*rdev
= bio
->bi_private
;
707 struct mddev
*mddev
= rdev
->mddev
;
709 if (error
|| !test_bit(BIO_UPTODATE
, &bio
->bi_flags
)) {
710 printk("md: super_written gets error=%d, uptodate=%d\n",
711 error
, test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
712 WARN_ON(test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
713 md_error(mddev
, rdev
);
716 if (atomic_dec_and_test(&mddev
->pending_writes
))
717 wake_up(&mddev
->sb_wait
);
721 void md_super_write(struct mddev
*mddev
, struct md_rdev
*rdev
,
722 sector_t sector
, int size
, struct page
*page
)
724 /* write first size bytes of page to sector of rdev
725 * Increment mddev->pending_writes before returning
726 * and decrement it on completion, waking up sb_wait
727 * if zero is reached.
728 * If an error occurred, call md_error
730 struct bio
*bio
= bio_alloc_mddev(GFP_NOIO
, 1, mddev
);
732 bio
->bi_bdev
= rdev
->meta_bdev
? rdev
->meta_bdev
: rdev
->bdev
;
733 bio
->bi_iter
.bi_sector
= sector
;
734 bio_add_page(bio
, page
, size
, 0);
735 bio
->bi_private
= rdev
;
736 bio
->bi_end_io
= super_written
;
738 atomic_inc(&mddev
->pending_writes
);
739 submit_bio(WRITE_FLUSH_FUA
, bio
);
742 void md_super_wait(struct mddev
*mddev
)
744 /* wait for all superblock writes that were scheduled to complete */
745 wait_event(mddev
->sb_wait
, atomic_read(&mddev
->pending_writes
)==0);
748 int sync_page_io(struct md_rdev
*rdev
, sector_t sector
, int size
,
749 struct page
*page
, int rw
, bool metadata_op
)
751 struct bio
*bio
= bio_alloc_mddev(GFP_NOIO
, 1, rdev
->mddev
);
754 bio
->bi_bdev
= (metadata_op
&& rdev
->meta_bdev
) ?
755 rdev
->meta_bdev
: rdev
->bdev
;
757 bio
->bi_iter
.bi_sector
= sector
+ rdev
->sb_start
;
758 else if (rdev
->mddev
->reshape_position
!= MaxSector
&&
759 (rdev
->mddev
->reshape_backwards
==
760 (sector
>= rdev
->mddev
->reshape_position
)))
761 bio
->bi_iter
.bi_sector
= sector
+ rdev
->new_data_offset
;
763 bio
->bi_iter
.bi_sector
= sector
+ rdev
->data_offset
;
764 bio_add_page(bio
, page
, size
, 0);
765 submit_bio_wait(rw
, bio
);
767 ret
= test_bit(BIO_UPTODATE
, &bio
->bi_flags
);
771 EXPORT_SYMBOL_GPL(sync_page_io
);
773 static int read_disk_sb(struct md_rdev
*rdev
, int size
)
775 char b
[BDEVNAME_SIZE
];
780 if (!sync_page_io(rdev
, 0, size
, rdev
->sb_page
, READ
, true))
786 printk(KERN_WARNING
"md: disabled device %s, could not read superblock.\n",
787 bdevname(rdev
->bdev
,b
));
791 static int uuid_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
793 return sb1
->set_uuid0
== sb2
->set_uuid0
&&
794 sb1
->set_uuid1
== sb2
->set_uuid1
&&
795 sb1
->set_uuid2
== sb2
->set_uuid2
&&
796 sb1
->set_uuid3
== sb2
->set_uuid3
;
799 static int sb_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
802 mdp_super_t
*tmp1
, *tmp2
;
804 tmp1
= kmalloc(sizeof(*tmp1
),GFP_KERNEL
);
805 tmp2
= kmalloc(sizeof(*tmp2
),GFP_KERNEL
);
807 if (!tmp1
|| !tmp2
) {
809 printk(KERN_INFO
"md.c sb_equal(): failed to allocate memory!\n");
817 * nr_disks is not constant
822 ret
= (memcmp(tmp1
, tmp2
, MD_SB_GENERIC_CONSTANT_WORDS
* 4) == 0);
829 static u32
md_csum_fold(u32 csum
)
831 csum
= (csum
& 0xffff) + (csum
>> 16);
832 return (csum
& 0xffff) + (csum
>> 16);
835 static unsigned int calc_sb_csum(mdp_super_t
*sb
)
838 u32
*sb32
= (u32
*)sb
;
840 unsigned int disk_csum
, csum
;
842 disk_csum
= sb
->sb_csum
;
845 for (i
= 0; i
< MD_SB_BYTES
/4 ; i
++)
847 csum
= (newcsum
& 0xffffffff) + (newcsum
>>32);
850 /* This used to use csum_partial, which was wrong for several
851 * reasons including that different results are returned on
852 * different architectures. It isn't critical that we get exactly
853 * the same return value as before (we always csum_fold before
854 * testing, and that removes any differences). However as we
855 * know that csum_partial always returned a 16bit value on
856 * alphas, do a fold to maximise conformity to previous behaviour.
858 sb
->sb_csum
= md_csum_fold(disk_csum
);
860 sb
->sb_csum
= disk_csum
;
866 * Handle superblock details.
867 * We want to be able to handle multiple superblock formats
868 * so we have a common interface to them all, and an array of
869 * different handlers.
870 * We rely on user-space to write the initial superblock, and support
871 * reading and updating of superblocks.
872 * Interface methods are:
873 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version)
874 * loads and validates a superblock on dev.
875 * if refdev != NULL, compare superblocks on both devices
877 * 0 - dev has a superblock that is compatible with refdev
878 * 1 - dev has a superblock that is compatible and newer than refdev
879 * so dev should be used as the refdev in future
880 * -EINVAL superblock incompatible or invalid
881 * -othererror e.g. -EIO
883 * int validate_super(struct mddev *mddev, struct md_rdev *dev)
884 * Verify that dev is acceptable into mddev.
885 * The first time, mddev->raid_disks will be 0, and data from
886 * dev should be merged in. Subsequent calls check that dev
887 * is new enough. Return 0 or -EINVAL
889 * void sync_super(struct mddev *mddev, struct md_rdev *dev)
890 * Update the superblock for rdev with data in mddev
891 * This does not write to disc.
897 struct module
*owner
;
898 int (*load_super
)(struct md_rdev
*rdev
,
899 struct md_rdev
*refdev
,
901 int (*validate_super
)(struct mddev
*mddev
,
902 struct md_rdev
*rdev
);
903 void (*sync_super
)(struct mddev
*mddev
,
904 struct md_rdev
*rdev
);
905 unsigned long long (*rdev_size_change
)(struct md_rdev
*rdev
,
906 sector_t num_sectors
);
907 int (*allow_new_offset
)(struct md_rdev
*rdev
,
908 unsigned long long new_offset
);
912 * Check that the given mddev has no bitmap.
914 * This function is called from the run method of all personalities that do not
915 * support bitmaps. It prints an error message and returns non-zero if mddev
916 * has a bitmap. Otherwise, it returns 0.
919 int md_check_no_bitmap(struct mddev
*mddev
)
921 if (!mddev
->bitmap_info
.file
&& !mddev
->bitmap_info
.offset
)
923 printk(KERN_ERR
"%s: bitmaps are not supported for %s\n",
924 mdname(mddev
), mddev
->pers
->name
);
927 EXPORT_SYMBOL(md_check_no_bitmap
);
930 * load_super for 0.90.0
932 static int super_90_load(struct md_rdev
*rdev
, struct md_rdev
*refdev
, int minor_version
)
934 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
939 * Calculate the position of the superblock (512byte sectors),
940 * it's at the end of the disk.
942 * It also happens to be a multiple of 4Kb.
944 rdev
->sb_start
= calc_dev_sboffset(rdev
);
946 ret
= read_disk_sb(rdev
, MD_SB_BYTES
);
951 bdevname(rdev
->bdev
, b
);
952 sb
= page_address(rdev
->sb_page
);
954 if (sb
->md_magic
!= MD_SB_MAGIC
) {
955 printk(KERN_ERR
"md: invalid raid superblock magic on %s\n",
960 if (sb
->major_version
!= 0 ||
961 sb
->minor_version
< 90 ||
962 sb
->minor_version
> 91) {
963 printk(KERN_WARNING
"Bad version number %d.%d on %s\n",
964 sb
->major_version
, sb
->minor_version
,
969 if (sb
->raid_disks
<= 0)
972 if (md_csum_fold(calc_sb_csum(sb
)) != md_csum_fold(sb
->sb_csum
)) {
973 printk(KERN_WARNING
"md: invalid superblock checksum on %s\n",
978 rdev
->preferred_minor
= sb
->md_minor
;
979 rdev
->data_offset
= 0;
980 rdev
->new_data_offset
= 0;
981 rdev
->sb_size
= MD_SB_BYTES
;
982 rdev
->badblocks
.shift
= -1;
984 if (sb
->level
== LEVEL_MULTIPATH
)
987 rdev
->desc_nr
= sb
->this_disk
.number
;
993 mdp_super_t
*refsb
= page_address(refdev
->sb_page
);
994 if (!uuid_equal(refsb
, sb
)) {
995 printk(KERN_WARNING
"md: %s has different UUID to %s\n",
996 b
, bdevname(refdev
->bdev
,b2
));
999 if (!sb_equal(refsb
, sb
)) {
1000 printk(KERN_WARNING
"md: %s has same UUID"
1001 " but different superblock to %s\n",
1002 b
, bdevname(refdev
->bdev
, b2
));
1006 ev2
= md_event(refsb
);
1012 rdev
->sectors
= rdev
->sb_start
;
1013 /* Limit to 4TB as metadata cannot record more than that.
1014 * (not needed for Linear and RAID0 as metadata doesn't
1017 if (rdev
->sectors
>= (2ULL << 32) && sb
->level
>= 1)
1018 rdev
->sectors
= (2ULL << 32) - 2;
1020 if (rdev
->sectors
< ((sector_t
)sb
->size
) * 2 && sb
->level
>= 1)
1021 /* "this cannot possibly happen" ... */
1029 * validate_super for 0.90.0
1031 static int super_90_validate(struct mddev
*mddev
, struct md_rdev
*rdev
)
1034 mdp_super_t
*sb
= page_address(rdev
->sb_page
);
1035 __u64 ev1
= md_event(sb
);
1037 rdev
->raid_disk
= -1;
1038 clear_bit(Faulty
, &rdev
->flags
);
1039 clear_bit(In_sync
, &rdev
->flags
);
1040 clear_bit(Bitmap_sync
, &rdev
->flags
);
1041 clear_bit(WriteMostly
, &rdev
->flags
);
1043 if (mddev
->raid_disks
== 0) {
1044 mddev
->major_version
= 0;
1045 mddev
->minor_version
= sb
->minor_version
;
1046 mddev
->patch_version
= sb
->patch_version
;
1047 mddev
->external
= 0;
1048 mddev
->chunk_sectors
= sb
->chunk_size
>> 9;
1049 mddev
->ctime
= sb
->ctime
;
1050 mddev
->utime
= sb
->utime
;
1051 mddev
->level
= sb
->level
;
1052 mddev
->clevel
[0] = 0;
1053 mddev
->layout
= sb
->layout
;
1054 mddev
->raid_disks
= sb
->raid_disks
;
1055 mddev
->dev_sectors
= ((sector_t
)sb
->size
) * 2;
1056 mddev
->events
= ev1
;
1057 mddev
->bitmap_info
.offset
= 0;
1058 mddev
->bitmap_info
.space
= 0;
1059 /* bitmap can use 60 K after the 4K superblocks */
1060 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
1061 mddev
->bitmap_info
.default_space
= 64*2 - (MD_SB_BYTES
>> 9);
1062 mddev
->reshape_backwards
= 0;
1064 if (mddev
->minor_version
>= 91) {
1065 mddev
->reshape_position
= sb
->reshape_position
;
1066 mddev
->delta_disks
= sb
->delta_disks
;
1067 mddev
->new_level
= sb
->new_level
;
1068 mddev
->new_layout
= sb
->new_layout
;
1069 mddev
->new_chunk_sectors
= sb
->new_chunk
>> 9;
1070 if (mddev
->delta_disks
< 0)
1071 mddev
->reshape_backwards
= 1;
1073 mddev
->reshape_position
= MaxSector
;
1074 mddev
->delta_disks
= 0;
1075 mddev
->new_level
= mddev
->level
;
1076 mddev
->new_layout
= mddev
->layout
;
1077 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1080 if (sb
->state
& (1<<MD_SB_CLEAN
))
1081 mddev
->recovery_cp
= MaxSector
;
1083 if (sb
->events_hi
== sb
->cp_events_hi
&&
1084 sb
->events_lo
== sb
->cp_events_lo
) {
1085 mddev
->recovery_cp
= sb
->recovery_cp
;
1087 mddev
->recovery_cp
= 0;
1090 memcpy(mddev
->uuid
+0, &sb
->set_uuid0
, 4);
1091 memcpy(mddev
->uuid
+4, &sb
->set_uuid1
, 4);
1092 memcpy(mddev
->uuid
+8, &sb
->set_uuid2
, 4);
1093 memcpy(mddev
->uuid
+12,&sb
->set_uuid3
, 4);
1095 mddev
->max_disks
= MD_SB_DISKS
;
1097 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
) &&
1098 mddev
->bitmap_info
.file
== NULL
) {
1099 mddev
->bitmap_info
.offset
=
1100 mddev
->bitmap_info
.default_offset
;
1101 mddev
->bitmap_info
.space
=
1102 mddev
->bitmap_info
.default_space
;
1105 } else if (mddev
->pers
== NULL
) {
1106 /* Insist on good event counter while assembling, except
1107 * for spares (which don't need an event count) */
1109 if (sb
->disks
[rdev
->desc_nr
].state
& (
1110 (1<<MD_DISK_SYNC
) | (1 << MD_DISK_ACTIVE
)))
1111 if (ev1
< mddev
->events
)
1113 } else if (mddev
->bitmap
) {
1114 /* if adding to array with a bitmap, then we can accept an
1115 * older device ... but not too old.
1117 if (ev1
< mddev
->bitmap
->events_cleared
)
1119 if (ev1
< mddev
->events
)
1120 set_bit(Bitmap_sync
, &rdev
->flags
);
1122 if (ev1
< mddev
->events
)
1123 /* just a hot-add of a new device, leave raid_disk at -1 */
1127 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1128 desc
= sb
->disks
+ rdev
->desc_nr
;
1130 if (desc
->state
& (1<<MD_DISK_FAULTY
))
1131 set_bit(Faulty
, &rdev
->flags
);
1132 else if (desc
->state
& (1<<MD_DISK_SYNC
) /* &&
1133 desc->raid_disk < mddev->raid_disks */) {
1134 set_bit(In_sync
, &rdev
->flags
);
1135 rdev
->raid_disk
= desc
->raid_disk
;
1136 rdev
->saved_raid_disk
= desc
->raid_disk
;
1137 } else if (desc
->state
& (1<<MD_DISK_ACTIVE
)) {
1138 /* active but not in sync implies recovery up to
1139 * reshape position. We don't know exactly where
1140 * that is, so set to zero for now */
1141 if (mddev
->minor_version
>= 91) {
1142 rdev
->recovery_offset
= 0;
1143 rdev
->raid_disk
= desc
->raid_disk
;
1146 if (desc
->state
& (1<<MD_DISK_WRITEMOSTLY
))
1147 set_bit(WriteMostly
, &rdev
->flags
);
1148 } else /* MULTIPATH are always insync */
1149 set_bit(In_sync
, &rdev
->flags
);
1154 * sync_super for 0.90.0
1156 static void super_90_sync(struct mddev
*mddev
, struct md_rdev
*rdev
)
1159 struct md_rdev
*rdev2
;
1160 int next_spare
= mddev
->raid_disks
;
1162 /* make rdev->sb match mddev data..
1165 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1166 * 3/ any empty disks < next_spare become removed
1168 * disks[0] gets initialised to REMOVED because
1169 * we cannot be sure from other fields if it has
1170 * been initialised or not.
1173 int active
=0, working
=0,failed
=0,spare
=0,nr_disks
=0;
1175 rdev
->sb_size
= MD_SB_BYTES
;
1177 sb
= page_address(rdev
->sb_page
);
1179 memset(sb
, 0, sizeof(*sb
));
1181 sb
->md_magic
= MD_SB_MAGIC
;
1182 sb
->major_version
= mddev
->major_version
;
1183 sb
->patch_version
= mddev
->patch_version
;
1184 sb
->gvalid_words
= 0; /* ignored */
1185 memcpy(&sb
->set_uuid0
, mddev
->uuid
+0, 4);
1186 memcpy(&sb
->set_uuid1
, mddev
->uuid
+4, 4);
1187 memcpy(&sb
->set_uuid2
, mddev
->uuid
+8, 4);
1188 memcpy(&sb
->set_uuid3
, mddev
->uuid
+12,4);
1190 sb
->ctime
= mddev
->ctime
;
1191 sb
->level
= mddev
->level
;
1192 sb
->size
= mddev
->dev_sectors
/ 2;
1193 sb
->raid_disks
= mddev
->raid_disks
;
1194 sb
->md_minor
= mddev
->md_minor
;
1195 sb
->not_persistent
= 0;
1196 sb
->utime
= mddev
->utime
;
1198 sb
->events_hi
= (mddev
->events
>>32);
1199 sb
->events_lo
= (u32
)mddev
->events
;
1201 if (mddev
->reshape_position
== MaxSector
)
1202 sb
->minor_version
= 90;
1204 sb
->minor_version
= 91;
1205 sb
->reshape_position
= mddev
->reshape_position
;
1206 sb
->new_level
= mddev
->new_level
;
1207 sb
->delta_disks
= mddev
->delta_disks
;
1208 sb
->new_layout
= mddev
->new_layout
;
1209 sb
->new_chunk
= mddev
->new_chunk_sectors
<< 9;
1211 mddev
->minor_version
= sb
->minor_version
;
1214 sb
->recovery_cp
= mddev
->recovery_cp
;
1215 sb
->cp_events_hi
= (mddev
->events
>>32);
1216 sb
->cp_events_lo
= (u32
)mddev
->events
;
1217 if (mddev
->recovery_cp
== MaxSector
)
1218 sb
->state
= (1<< MD_SB_CLEAN
);
1220 sb
->recovery_cp
= 0;
1222 sb
->layout
= mddev
->layout
;
1223 sb
->chunk_size
= mddev
->chunk_sectors
<< 9;
1225 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
)
1226 sb
->state
|= (1<<MD_SB_BITMAP_PRESENT
);
1228 sb
->disks
[0].state
= (1<<MD_DISK_REMOVED
);
1229 rdev_for_each(rdev2
, mddev
) {
1232 int is_active
= test_bit(In_sync
, &rdev2
->flags
);
1234 if (rdev2
->raid_disk
>= 0 &&
1235 sb
->minor_version
>= 91)
1236 /* we have nowhere to store the recovery_offset,
1237 * but if it is not below the reshape_position,
1238 * we can piggy-back on that.
1241 if (rdev2
->raid_disk
< 0 ||
1242 test_bit(Faulty
, &rdev2
->flags
))
1245 desc_nr
= rdev2
->raid_disk
;
1247 desc_nr
= next_spare
++;
1248 rdev2
->desc_nr
= desc_nr
;
1249 d
= &sb
->disks
[rdev2
->desc_nr
];
1251 d
->number
= rdev2
->desc_nr
;
1252 d
->major
= MAJOR(rdev2
->bdev
->bd_dev
);
1253 d
->minor
= MINOR(rdev2
->bdev
->bd_dev
);
1255 d
->raid_disk
= rdev2
->raid_disk
;
1257 d
->raid_disk
= rdev2
->desc_nr
; /* compatibility */
1258 if (test_bit(Faulty
, &rdev2
->flags
))
1259 d
->state
= (1<<MD_DISK_FAULTY
);
1260 else if (is_active
) {
1261 d
->state
= (1<<MD_DISK_ACTIVE
);
1262 if (test_bit(In_sync
, &rdev2
->flags
))
1263 d
->state
|= (1<<MD_DISK_SYNC
);
1271 if (test_bit(WriteMostly
, &rdev2
->flags
))
1272 d
->state
|= (1<<MD_DISK_WRITEMOSTLY
);
1274 /* now set the "removed" and "faulty" bits on any missing devices */
1275 for (i
=0 ; i
< mddev
->raid_disks
; i
++) {
1276 mdp_disk_t
*d
= &sb
->disks
[i
];
1277 if (d
->state
== 0 && d
->number
== 0) {
1280 d
->state
= (1<<MD_DISK_REMOVED
);
1281 d
->state
|= (1<<MD_DISK_FAULTY
);
1285 sb
->nr_disks
= nr_disks
;
1286 sb
->active_disks
= active
;
1287 sb
->working_disks
= working
;
1288 sb
->failed_disks
= failed
;
1289 sb
->spare_disks
= spare
;
1291 sb
->this_disk
= sb
->disks
[rdev
->desc_nr
];
1292 sb
->sb_csum
= calc_sb_csum(sb
);
1296 * rdev_size_change for 0.90.0
1298 static unsigned long long
1299 super_90_rdev_size_change(struct md_rdev
*rdev
, sector_t num_sectors
)
1301 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1302 return 0; /* component must fit device */
1303 if (rdev
->mddev
->bitmap_info
.offset
)
1304 return 0; /* can't move bitmap */
1305 rdev
->sb_start
= calc_dev_sboffset(rdev
);
1306 if (!num_sectors
|| num_sectors
> rdev
->sb_start
)
1307 num_sectors
= rdev
->sb_start
;
1308 /* Limit to 4TB as metadata cannot record more than that.
1309 * 4TB == 2^32 KB, or 2*2^32 sectors.
1311 if (num_sectors
>= (2ULL << 32) && rdev
->mddev
->level
>= 1)
1312 num_sectors
= (2ULL << 32) - 2;
1313 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1315 md_super_wait(rdev
->mddev
);
1320 super_90_allow_new_offset(struct md_rdev
*rdev
, unsigned long long new_offset
)
1322 /* non-zero offset changes not possible with v0.90 */
1323 return new_offset
== 0;
1327 * version 1 superblock
1330 static __le32
calc_sb_1_csum(struct mdp_superblock_1
*sb
)
1334 unsigned long long newcsum
;
1335 int size
= 256 + le32_to_cpu(sb
->max_dev
)*2;
1336 __le32
*isuper
= (__le32
*)sb
;
1338 disk_csum
= sb
->sb_csum
;
1341 for (; size
>= 4; size
-= 4)
1342 newcsum
+= le32_to_cpu(*isuper
++);
1345 newcsum
+= le16_to_cpu(*(__le16
*) isuper
);
1347 csum
= (newcsum
& 0xffffffff) + (newcsum
>> 32);
1348 sb
->sb_csum
= disk_csum
;
1349 return cpu_to_le32(csum
);
1352 static int md_set_badblocks(struct badblocks
*bb
, sector_t s
, int sectors
,
1354 static int super_1_load(struct md_rdev
*rdev
, struct md_rdev
*refdev
, int minor_version
)
1356 struct mdp_superblock_1
*sb
;
1360 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1364 * Calculate the position of the superblock in 512byte sectors.
1365 * It is always aligned to a 4K boundary and
1366 * depeding on minor_version, it can be:
1367 * 0: At least 8K, but less than 12K, from end of device
1368 * 1: At start of device
1369 * 2: 4K from start of device.
1371 switch(minor_version
) {
1373 sb_start
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1375 sb_start
&= ~(sector_t
)(4*2-1);
1386 rdev
->sb_start
= sb_start
;
1388 /* superblock is rarely larger than 1K, but it can be larger,
1389 * and it is safe to read 4k, so we do that
1391 ret
= read_disk_sb(rdev
, 4096);
1392 if (ret
) return ret
;
1394 sb
= page_address(rdev
->sb_page
);
1396 if (sb
->magic
!= cpu_to_le32(MD_SB_MAGIC
) ||
1397 sb
->major_version
!= cpu_to_le32(1) ||
1398 le32_to_cpu(sb
->max_dev
) > (4096-256)/2 ||
1399 le64_to_cpu(sb
->super_offset
) != rdev
->sb_start
||
1400 (le32_to_cpu(sb
->feature_map
) & ~MD_FEATURE_ALL
) != 0)
1403 if (calc_sb_1_csum(sb
) != sb
->sb_csum
) {
1404 printk("md: invalid superblock checksum on %s\n",
1405 bdevname(rdev
->bdev
,b
));
1408 if (le64_to_cpu(sb
->data_size
) < 10) {
1409 printk("md: data_size too small on %s\n",
1410 bdevname(rdev
->bdev
,b
));
1415 memcmp(sb
->pad3
, sb
->pad3
+1, sizeof(sb
->pad3
) - sizeof(sb
->pad3
[1])))
1416 /* Some padding is non-zero, might be a new feature */
1419 rdev
->preferred_minor
= 0xffff;
1420 rdev
->data_offset
= le64_to_cpu(sb
->data_offset
);
1421 rdev
->new_data_offset
= rdev
->data_offset
;
1422 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
) &&
1423 (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_NEW_OFFSET
))
1424 rdev
->new_data_offset
+= (s32
)le32_to_cpu(sb
->new_offset
);
1425 atomic_set(&rdev
->corrected_errors
, le32_to_cpu(sb
->cnt_corrected_read
));
1427 rdev
->sb_size
= le32_to_cpu(sb
->max_dev
) * 2 + 256;
1428 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1429 if (rdev
->sb_size
& bmask
)
1430 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1433 && rdev
->data_offset
< sb_start
+ (rdev
->sb_size
/512))
1436 && rdev
->new_data_offset
< sb_start
+ (rdev
->sb_size
/512))
1439 if (sb
->level
== cpu_to_le32(LEVEL_MULTIPATH
))
1442 rdev
->desc_nr
= le32_to_cpu(sb
->dev_number
);
1444 if (!rdev
->bb_page
) {
1445 rdev
->bb_page
= alloc_page(GFP_KERNEL
);
1449 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BAD_BLOCKS
) &&
1450 rdev
->badblocks
.count
== 0) {
1451 /* need to load the bad block list.
1452 * Currently we limit it to one page.
1458 int sectors
= le16_to_cpu(sb
->bblog_size
);
1459 if (sectors
> (PAGE_SIZE
/ 512))
1461 offset
= le32_to_cpu(sb
->bblog_offset
);
1464 bb_sector
= (long long)offset
;
1465 if (!sync_page_io(rdev
, bb_sector
, sectors
<< 9,
1466 rdev
->bb_page
, READ
, true))
1468 bbp
= (u64
*)page_address(rdev
->bb_page
);
1469 rdev
->badblocks
.shift
= sb
->bblog_shift
;
1470 for (i
= 0 ; i
< (sectors
<< (9-3)) ; i
++, bbp
++) {
1471 u64 bb
= le64_to_cpu(*bbp
);
1472 int count
= bb
& (0x3ff);
1473 u64 sector
= bb
>> 10;
1474 sector
<<= sb
->bblog_shift
;
1475 count
<<= sb
->bblog_shift
;
1478 if (md_set_badblocks(&rdev
->badblocks
,
1479 sector
, count
, 1) == 0)
1482 } else if (sb
->bblog_offset
!= 0)
1483 rdev
->badblocks
.shift
= 0;
1489 struct mdp_superblock_1
*refsb
= page_address(refdev
->sb_page
);
1491 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16) != 0 ||
1492 sb
->level
!= refsb
->level
||
1493 sb
->layout
!= refsb
->layout
||
1494 sb
->chunksize
!= refsb
->chunksize
) {
1495 printk(KERN_WARNING
"md: %s has strangely different"
1496 " superblock to %s\n",
1497 bdevname(rdev
->bdev
,b
),
1498 bdevname(refdev
->bdev
,b2
));
1501 ev1
= le64_to_cpu(sb
->events
);
1502 ev2
= le64_to_cpu(refsb
->events
);
1509 if (minor_version
) {
1510 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9);
1511 sectors
-= rdev
->data_offset
;
1513 sectors
= rdev
->sb_start
;
1514 if (sectors
< le64_to_cpu(sb
->data_size
))
1516 rdev
->sectors
= le64_to_cpu(sb
->data_size
);
1520 static int super_1_validate(struct mddev
*mddev
, struct md_rdev
*rdev
)
1522 struct mdp_superblock_1
*sb
= page_address(rdev
->sb_page
);
1523 __u64 ev1
= le64_to_cpu(sb
->events
);
1525 rdev
->raid_disk
= -1;
1526 clear_bit(Faulty
, &rdev
->flags
);
1527 clear_bit(In_sync
, &rdev
->flags
);
1528 clear_bit(Bitmap_sync
, &rdev
->flags
);
1529 clear_bit(WriteMostly
, &rdev
->flags
);
1531 if (mddev
->raid_disks
== 0) {
1532 mddev
->major_version
= 1;
1533 mddev
->patch_version
= 0;
1534 mddev
->external
= 0;
1535 mddev
->chunk_sectors
= le32_to_cpu(sb
->chunksize
);
1536 mddev
->ctime
= le64_to_cpu(sb
->ctime
) & ((1ULL << 32)-1);
1537 mddev
->utime
= le64_to_cpu(sb
->utime
) & ((1ULL << 32)-1);
1538 mddev
->level
= le32_to_cpu(sb
->level
);
1539 mddev
->clevel
[0] = 0;
1540 mddev
->layout
= le32_to_cpu(sb
->layout
);
1541 mddev
->raid_disks
= le32_to_cpu(sb
->raid_disks
);
1542 mddev
->dev_sectors
= le64_to_cpu(sb
->size
);
1543 mddev
->events
= ev1
;
1544 mddev
->bitmap_info
.offset
= 0;
1545 mddev
->bitmap_info
.space
= 0;
1546 /* Default location for bitmap is 1K after superblock
1547 * using 3K - total of 4K
1549 mddev
->bitmap_info
.default_offset
= 1024 >> 9;
1550 mddev
->bitmap_info
.default_space
= (4096-1024) >> 9;
1551 mddev
->reshape_backwards
= 0;
1553 mddev
->recovery_cp
= le64_to_cpu(sb
->resync_offset
);
1554 memcpy(mddev
->uuid
, sb
->set_uuid
, 16);
1556 mddev
->max_disks
= (4096-256)/2;
1558 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
) &&
1559 mddev
->bitmap_info
.file
== NULL
) {
1560 mddev
->bitmap_info
.offset
=
1561 (__s32
)le32_to_cpu(sb
->bitmap_offset
);
1562 /* Metadata doesn't record how much space is available.
1563 * For 1.0, we assume we can use up to the superblock
1564 * if before, else to 4K beyond superblock.
1565 * For others, assume no change is possible.
1567 if (mddev
->minor_version
> 0)
1568 mddev
->bitmap_info
.space
= 0;
1569 else if (mddev
->bitmap_info
.offset
> 0)
1570 mddev
->bitmap_info
.space
=
1571 8 - mddev
->bitmap_info
.offset
;
1573 mddev
->bitmap_info
.space
=
1574 -mddev
->bitmap_info
.offset
;
1577 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
1578 mddev
->reshape_position
= le64_to_cpu(sb
->reshape_position
);
1579 mddev
->delta_disks
= le32_to_cpu(sb
->delta_disks
);
1580 mddev
->new_level
= le32_to_cpu(sb
->new_level
);
1581 mddev
->new_layout
= le32_to_cpu(sb
->new_layout
);
1582 mddev
->new_chunk_sectors
= le32_to_cpu(sb
->new_chunk
);
1583 if (mddev
->delta_disks
< 0 ||
1584 (mddev
->delta_disks
== 0 &&
1585 (le32_to_cpu(sb
->feature_map
)
1586 & MD_FEATURE_RESHAPE_BACKWARDS
)))
1587 mddev
->reshape_backwards
= 1;
1589 mddev
->reshape_position
= MaxSector
;
1590 mddev
->delta_disks
= 0;
1591 mddev
->new_level
= mddev
->level
;
1592 mddev
->new_layout
= mddev
->layout
;
1593 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1596 } else if (mddev
->pers
== NULL
) {
1597 /* Insist of good event counter while assembling, except for
1598 * spares (which don't need an event count) */
1600 if (rdev
->desc_nr
>= 0 &&
1601 rdev
->desc_nr
< le32_to_cpu(sb
->max_dev
) &&
1602 le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]) < 0xfffe)
1603 if (ev1
< mddev
->events
)
1605 } else if (mddev
->bitmap
) {
1606 /* If adding to array with a bitmap, then we can accept an
1607 * older device, but not too old.
1609 if (ev1
< mddev
->bitmap
->events_cleared
)
1611 if (ev1
< mddev
->events
)
1612 set_bit(Bitmap_sync
, &rdev
->flags
);
1614 if (ev1
< mddev
->events
)
1615 /* just a hot-add of a new device, leave raid_disk at -1 */
1618 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1620 if (rdev
->desc_nr
< 0 ||
1621 rdev
->desc_nr
>= le32_to_cpu(sb
->max_dev
)) {
1625 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
1627 case 0xffff: /* spare */
1629 case 0xfffe: /* faulty */
1630 set_bit(Faulty
, &rdev
->flags
);
1633 rdev
->saved_raid_disk
= role
;
1634 if ((le32_to_cpu(sb
->feature_map
) &
1635 MD_FEATURE_RECOVERY_OFFSET
)) {
1636 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
1637 if (!(le32_to_cpu(sb
->feature_map
) &
1638 MD_FEATURE_RECOVERY_BITMAP
))
1639 rdev
->saved_raid_disk
= -1;
1641 set_bit(In_sync
, &rdev
->flags
);
1642 rdev
->raid_disk
= role
;
1645 if (sb
->devflags
& WriteMostly1
)
1646 set_bit(WriteMostly
, &rdev
->flags
);
1647 if (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_REPLACEMENT
)
1648 set_bit(Replacement
, &rdev
->flags
);
1649 } else /* MULTIPATH are always insync */
1650 set_bit(In_sync
, &rdev
->flags
);
1655 static void super_1_sync(struct mddev
*mddev
, struct md_rdev
*rdev
)
1657 struct mdp_superblock_1
*sb
;
1658 struct md_rdev
*rdev2
;
1660 /* make rdev->sb match mddev and rdev data. */
1662 sb
= page_address(rdev
->sb_page
);
1664 sb
->feature_map
= 0;
1666 sb
->recovery_offset
= cpu_to_le64(0);
1667 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
1669 sb
->utime
= cpu_to_le64((__u64
)mddev
->utime
);
1670 sb
->events
= cpu_to_le64(mddev
->events
);
1672 sb
->resync_offset
= cpu_to_le64(mddev
->recovery_cp
);
1674 sb
->resync_offset
= cpu_to_le64(0);
1676 sb
->cnt_corrected_read
= cpu_to_le32(atomic_read(&rdev
->corrected_errors
));
1678 sb
->raid_disks
= cpu_to_le32(mddev
->raid_disks
);
1679 sb
->size
= cpu_to_le64(mddev
->dev_sectors
);
1680 sb
->chunksize
= cpu_to_le32(mddev
->chunk_sectors
);
1681 sb
->level
= cpu_to_le32(mddev
->level
);
1682 sb
->layout
= cpu_to_le32(mddev
->layout
);
1684 if (test_bit(WriteMostly
, &rdev
->flags
))
1685 sb
->devflags
|= WriteMostly1
;
1687 sb
->devflags
&= ~WriteMostly1
;
1688 sb
->data_offset
= cpu_to_le64(rdev
->data_offset
);
1689 sb
->data_size
= cpu_to_le64(rdev
->sectors
);
1691 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
) {
1692 sb
->bitmap_offset
= cpu_to_le32((__u32
)mddev
->bitmap_info
.offset
);
1693 sb
->feature_map
= cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
);
1696 if (rdev
->raid_disk
>= 0 &&
1697 !test_bit(In_sync
, &rdev
->flags
)) {
1699 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET
);
1700 sb
->recovery_offset
=
1701 cpu_to_le64(rdev
->recovery_offset
);
1702 if (rdev
->saved_raid_disk
>= 0 && mddev
->bitmap
)
1704 cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP
);
1706 if (test_bit(Replacement
, &rdev
->flags
))
1708 cpu_to_le32(MD_FEATURE_REPLACEMENT
);
1710 if (mddev
->reshape_position
!= MaxSector
) {
1711 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE
);
1712 sb
->reshape_position
= cpu_to_le64(mddev
->reshape_position
);
1713 sb
->new_layout
= cpu_to_le32(mddev
->new_layout
);
1714 sb
->delta_disks
= cpu_to_le32(mddev
->delta_disks
);
1715 sb
->new_level
= cpu_to_le32(mddev
->new_level
);
1716 sb
->new_chunk
= cpu_to_le32(mddev
->new_chunk_sectors
);
1717 if (mddev
->delta_disks
== 0 &&
1718 mddev
->reshape_backwards
)
1720 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS
);
1721 if (rdev
->new_data_offset
!= rdev
->data_offset
) {
1723 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET
);
1724 sb
->new_offset
= cpu_to_le32((__u32
)(rdev
->new_data_offset
1725 - rdev
->data_offset
));
1729 if (rdev
->badblocks
.count
== 0)
1730 /* Nothing to do for bad blocks*/ ;
1731 else if (sb
->bblog_offset
== 0)
1732 /* Cannot record bad blocks on this device */
1733 md_error(mddev
, rdev
);
1735 struct badblocks
*bb
= &rdev
->badblocks
;
1736 u64
*bbp
= (u64
*)page_address(rdev
->bb_page
);
1738 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_BAD_BLOCKS
);
1743 seq
= read_seqbegin(&bb
->lock
);
1745 memset(bbp
, 0xff, PAGE_SIZE
);
1747 for (i
= 0 ; i
< bb
->count
; i
++) {
1748 u64 internal_bb
= p
[i
];
1749 u64 store_bb
= ((BB_OFFSET(internal_bb
) << 10)
1750 | BB_LEN(internal_bb
));
1751 bbp
[i
] = cpu_to_le64(store_bb
);
1754 if (read_seqretry(&bb
->lock
, seq
))
1757 bb
->sector
= (rdev
->sb_start
+
1758 (int)le32_to_cpu(sb
->bblog_offset
));
1759 bb
->size
= le16_to_cpu(sb
->bblog_size
);
1764 rdev_for_each(rdev2
, mddev
)
1765 if (rdev2
->desc_nr
+1 > max_dev
)
1766 max_dev
= rdev2
->desc_nr
+1;
1768 if (max_dev
> le32_to_cpu(sb
->max_dev
)) {
1770 sb
->max_dev
= cpu_to_le32(max_dev
);
1771 rdev
->sb_size
= max_dev
* 2 + 256;
1772 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1773 if (rdev
->sb_size
& bmask
)
1774 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1776 max_dev
= le32_to_cpu(sb
->max_dev
);
1778 for (i
=0; i
<max_dev
;i
++)
1779 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1781 rdev_for_each(rdev2
, mddev
) {
1783 if (test_bit(Faulty
, &rdev2
->flags
))
1784 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1785 else if (test_bit(In_sync
, &rdev2
->flags
))
1786 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1787 else if (rdev2
->raid_disk
>= 0)
1788 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1790 sb
->dev_roles
[i
] = cpu_to_le16(0xffff);
1793 sb
->sb_csum
= calc_sb_1_csum(sb
);
1796 static unsigned long long
1797 super_1_rdev_size_change(struct md_rdev
*rdev
, sector_t num_sectors
)
1799 struct mdp_superblock_1
*sb
;
1800 sector_t max_sectors
;
1801 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1802 return 0; /* component must fit device */
1803 if (rdev
->data_offset
!= rdev
->new_data_offset
)
1804 return 0; /* too confusing */
1805 if (rdev
->sb_start
< rdev
->data_offset
) {
1806 /* minor versions 1 and 2; superblock before data */
1807 max_sectors
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1808 max_sectors
-= rdev
->data_offset
;
1809 if (!num_sectors
|| num_sectors
> max_sectors
)
1810 num_sectors
= max_sectors
;
1811 } else if (rdev
->mddev
->bitmap_info
.offset
) {
1812 /* minor version 0 with bitmap we can't move */
1815 /* minor version 0; superblock after data */
1817 sb_start
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) - 8*2;
1818 sb_start
&= ~(sector_t
)(4*2 - 1);
1819 max_sectors
= rdev
->sectors
+ sb_start
- rdev
->sb_start
;
1820 if (!num_sectors
|| num_sectors
> max_sectors
)
1821 num_sectors
= max_sectors
;
1822 rdev
->sb_start
= sb_start
;
1824 sb
= page_address(rdev
->sb_page
);
1825 sb
->data_size
= cpu_to_le64(num_sectors
);
1826 sb
->super_offset
= rdev
->sb_start
;
1827 sb
->sb_csum
= calc_sb_1_csum(sb
);
1828 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1830 md_super_wait(rdev
->mddev
);
1836 super_1_allow_new_offset(struct md_rdev
*rdev
,
1837 unsigned long long new_offset
)
1839 /* All necessary checks on new >= old have been done */
1840 struct bitmap
*bitmap
;
1841 if (new_offset
>= rdev
->data_offset
)
1844 /* with 1.0 metadata, there is no metadata to tread on
1845 * so we can always move back */
1846 if (rdev
->mddev
->minor_version
== 0)
1849 /* otherwise we must be sure not to step on
1850 * any metadata, so stay:
1851 * 36K beyond start of superblock
1852 * beyond end of badblocks
1853 * beyond write-intent bitmap
1855 if (rdev
->sb_start
+ (32+4)*2 > new_offset
)
1857 bitmap
= rdev
->mddev
->bitmap
;
1858 if (bitmap
&& !rdev
->mddev
->bitmap_info
.file
&&
1859 rdev
->sb_start
+ rdev
->mddev
->bitmap_info
.offset
+
1860 bitmap
->storage
.file_pages
* (PAGE_SIZE
>>9) > new_offset
)
1862 if (rdev
->badblocks
.sector
+ rdev
->badblocks
.size
> new_offset
)
1868 static struct super_type super_types
[] = {
1871 .owner
= THIS_MODULE
,
1872 .load_super
= super_90_load
,
1873 .validate_super
= super_90_validate
,
1874 .sync_super
= super_90_sync
,
1875 .rdev_size_change
= super_90_rdev_size_change
,
1876 .allow_new_offset
= super_90_allow_new_offset
,
1880 .owner
= THIS_MODULE
,
1881 .load_super
= super_1_load
,
1882 .validate_super
= super_1_validate
,
1883 .sync_super
= super_1_sync
,
1884 .rdev_size_change
= super_1_rdev_size_change
,
1885 .allow_new_offset
= super_1_allow_new_offset
,
1889 static void sync_super(struct mddev
*mddev
, struct md_rdev
*rdev
)
1891 if (mddev
->sync_super
) {
1892 mddev
->sync_super(mddev
, rdev
);
1896 BUG_ON(mddev
->major_version
>= ARRAY_SIZE(super_types
));
1898 super_types
[mddev
->major_version
].sync_super(mddev
, rdev
);
1901 static int match_mddev_units(struct mddev
*mddev1
, struct mddev
*mddev2
)
1903 struct md_rdev
*rdev
, *rdev2
;
1906 rdev_for_each_rcu(rdev
, mddev1
)
1907 rdev_for_each_rcu(rdev2
, mddev2
)
1908 if (rdev
->bdev
->bd_contains
==
1909 rdev2
->bdev
->bd_contains
) {
1917 static LIST_HEAD(pending_raid_disks
);
1920 * Try to register data integrity profile for an mddev
1922 * This is called when an array is started and after a disk has been kicked
1923 * from the array. It only succeeds if all working and active component devices
1924 * are integrity capable with matching profiles.
1926 int md_integrity_register(struct mddev
*mddev
)
1928 struct md_rdev
*rdev
, *reference
= NULL
;
1930 if (list_empty(&mddev
->disks
))
1931 return 0; /* nothing to do */
1932 if (!mddev
->gendisk
|| blk_get_integrity(mddev
->gendisk
))
1933 return 0; /* shouldn't register, or already is */
1934 rdev_for_each(rdev
, mddev
) {
1935 /* skip spares and non-functional disks */
1936 if (test_bit(Faulty
, &rdev
->flags
))
1938 if (rdev
->raid_disk
< 0)
1941 /* Use the first rdev as the reference */
1945 /* does this rdev's profile match the reference profile? */
1946 if (blk_integrity_compare(reference
->bdev
->bd_disk
,
1947 rdev
->bdev
->bd_disk
) < 0)
1950 if (!reference
|| !bdev_get_integrity(reference
->bdev
))
1953 * All component devices are integrity capable and have matching
1954 * profiles, register the common profile for the md device.
1956 if (blk_integrity_register(mddev
->gendisk
,
1957 bdev_get_integrity(reference
->bdev
)) != 0) {
1958 printk(KERN_ERR
"md: failed to register integrity for %s\n",
1962 printk(KERN_NOTICE
"md: data integrity enabled on %s\n", mdname(mddev
));
1963 if (bioset_integrity_create(mddev
->bio_set
, BIO_POOL_SIZE
)) {
1964 printk(KERN_ERR
"md: failed to create integrity pool for %s\n",
1970 EXPORT_SYMBOL(md_integrity_register
);
1972 /* Disable data integrity if non-capable/non-matching disk is being added */
1973 void md_integrity_add_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
1975 struct blk_integrity
*bi_rdev
;
1976 struct blk_integrity
*bi_mddev
;
1978 if (!mddev
->gendisk
)
1981 bi_rdev
= bdev_get_integrity(rdev
->bdev
);
1982 bi_mddev
= blk_get_integrity(mddev
->gendisk
);
1984 if (!bi_mddev
) /* nothing to do */
1986 if (rdev
->raid_disk
< 0) /* skip spares */
1988 if (bi_rdev
&& blk_integrity_compare(mddev
->gendisk
,
1989 rdev
->bdev
->bd_disk
) >= 0)
1991 printk(KERN_NOTICE
"disabling data integrity on %s\n", mdname(mddev
));
1992 blk_integrity_unregister(mddev
->gendisk
);
1994 EXPORT_SYMBOL(md_integrity_add_rdev
);
1996 static int bind_rdev_to_array(struct md_rdev
*rdev
, struct mddev
*mddev
)
1998 char b
[BDEVNAME_SIZE
];
2003 /* prevent duplicates */
2004 if (find_rdev(mddev
, rdev
->bdev
->bd_dev
))
2007 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2008 if (rdev
->sectors
&& (mddev
->dev_sectors
== 0 ||
2009 rdev
->sectors
< mddev
->dev_sectors
)) {
2011 /* Cannot change size, so fail
2012 * If mddev->level <= 0, then we don't care
2013 * about aligning sizes (e.g. linear)
2015 if (mddev
->level
> 0)
2018 mddev
->dev_sectors
= rdev
->sectors
;
2021 /* Verify rdev->desc_nr is unique.
2022 * If it is -1, assign a free number, else
2023 * check number is not in use
2026 if (rdev
->desc_nr
< 0) {
2029 choice
= mddev
->raid_disks
;
2030 while (find_rdev_nr_rcu(mddev
, choice
))
2032 rdev
->desc_nr
= choice
;
2034 if (find_rdev_nr_rcu(mddev
, rdev
->desc_nr
)) {
2040 if (mddev
->max_disks
&& rdev
->desc_nr
>= mddev
->max_disks
) {
2041 printk(KERN_WARNING
"md: %s: array is limited to %d devices\n",
2042 mdname(mddev
), mddev
->max_disks
);
2045 bdevname(rdev
->bdev
,b
);
2046 while ( (s
=strchr(b
, '/')) != NULL
)
2049 rdev
->mddev
= mddev
;
2050 printk(KERN_INFO
"md: bind<%s>\n", b
);
2052 if ((err
= kobject_add(&rdev
->kobj
, &mddev
->kobj
, "dev-%s", b
)))
2055 ko
= &part_to_dev(rdev
->bdev
->bd_part
)->kobj
;
2056 if (sysfs_create_link(&rdev
->kobj
, ko
, "block"))
2057 /* failure here is OK */;
2058 rdev
->sysfs_state
= sysfs_get_dirent_safe(rdev
->kobj
.sd
, "state");
2060 list_add_rcu(&rdev
->same_set
, &mddev
->disks
);
2061 bd_link_disk_holder(rdev
->bdev
, mddev
->gendisk
);
2063 /* May as well allow recovery to be retried once */
2064 mddev
->recovery_disabled
++;
2069 printk(KERN_WARNING
"md: failed to register dev-%s for %s\n",
2074 static void md_delayed_delete(struct work_struct
*ws
)
2076 struct md_rdev
*rdev
= container_of(ws
, struct md_rdev
, del_work
);
2077 kobject_del(&rdev
->kobj
);
2078 kobject_put(&rdev
->kobj
);
2081 static void unbind_rdev_from_array(struct md_rdev
*rdev
)
2083 char b
[BDEVNAME_SIZE
];
2085 bd_unlink_disk_holder(rdev
->bdev
, rdev
->mddev
->gendisk
);
2086 list_del_rcu(&rdev
->same_set
);
2087 printk(KERN_INFO
"md: unbind<%s>\n", bdevname(rdev
->bdev
,b
));
2089 sysfs_remove_link(&rdev
->kobj
, "block");
2090 sysfs_put(rdev
->sysfs_state
);
2091 rdev
->sysfs_state
= NULL
;
2092 rdev
->badblocks
.count
= 0;
2093 /* We need to delay this, otherwise we can deadlock when
2094 * writing to 'remove' to "dev/state". We also need
2095 * to delay it due to rcu usage.
2098 INIT_WORK(&rdev
->del_work
, md_delayed_delete
);
2099 kobject_get(&rdev
->kobj
);
2100 queue_work(md_misc_wq
, &rdev
->del_work
);
2104 * prevent the device from being mounted, repartitioned or
2105 * otherwise reused by a RAID array (or any other kernel
2106 * subsystem), by bd_claiming the device.
2108 static int lock_rdev(struct md_rdev
*rdev
, dev_t dev
, int shared
)
2111 struct block_device
*bdev
;
2112 char b
[BDEVNAME_SIZE
];
2114 bdev
= blkdev_get_by_dev(dev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
,
2115 shared
? (struct md_rdev
*)lock_rdev
: rdev
);
2117 printk(KERN_ERR
"md: could not open %s.\n",
2118 __bdevname(dev
, b
));
2119 return PTR_ERR(bdev
);
2125 static void unlock_rdev(struct md_rdev
*rdev
)
2127 struct block_device
*bdev
= rdev
->bdev
;
2129 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
);
2132 void md_autodetect_dev(dev_t dev
);
2134 static void export_rdev(struct md_rdev
*rdev
)
2136 char b
[BDEVNAME_SIZE
];
2138 printk(KERN_INFO
"md: export_rdev(%s)\n",
2139 bdevname(rdev
->bdev
,b
));
2140 md_rdev_clear(rdev
);
2142 if (test_bit(AutoDetected
, &rdev
->flags
))
2143 md_autodetect_dev(rdev
->bdev
->bd_dev
);
2146 kobject_put(&rdev
->kobj
);
2149 static void kick_rdev_from_array(struct md_rdev
*rdev
)
2151 unbind_rdev_from_array(rdev
);
2155 static void export_array(struct mddev
*mddev
)
2157 struct md_rdev
*rdev
;
2159 while (!list_empty(&mddev
->disks
)) {
2160 rdev
= list_first_entry(&mddev
->disks
, struct md_rdev
,
2162 kick_rdev_from_array(rdev
);
2164 mddev
->raid_disks
= 0;
2165 mddev
->major_version
= 0;
2168 static void sync_sbs(struct mddev
*mddev
, int nospares
)
2170 /* Update each superblock (in-memory image), but
2171 * if we are allowed to, skip spares which already
2172 * have the right event counter, or have one earlier
2173 * (which would mean they aren't being marked as dirty
2174 * with the rest of the array)
2176 struct md_rdev
*rdev
;
2177 rdev_for_each(rdev
, mddev
) {
2178 if (rdev
->sb_events
== mddev
->events
||
2180 rdev
->raid_disk
< 0 &&
2181 rdev
->sb_events
+1 == mddev
->events
)) {
2182 /* Don't update this superblock */
2183 rdev
->sb_loaded
= 2;
2185 sync_super(mddev
, rdev
);
2186 rdev
->sb_loaded
= 1;
2191 static void md_update_sb(struct mddev
*mddev
, int force_change
)
2193 struct md_rdev
*rdev
;
2196 int any_badblocks_changed
= 0;
2200 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
2204 /* First make sure individual recovery_offsets are correct */
2205 rdev_for_each(rdev
, mddev
) {
2206 if (rdev
->raid_disk
>= 0 &&
2207 mddev
->delta_disks
>= 0 &&
2208 !test_bit(In_sync
, &rdev
->flags
) &&
2209 mddev
->curr_resync_completed
> rdev
->recovery_offset
)
2210 rdev
->recovery_offset
= mddev
->curr_resync_completed
;
2213 if (!mddev
->persistent
) {
2214 clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
2215 clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
2216 if (!mddev
->external
) {
2217 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2218 rdev_for_each(rdev
, mddev
) {
2219 if (rdev
->badblocks
.changed
) {
2220 rdev
->badblocks
.changed
= 0;
2221 md_ack_all_badblocks(&rdev
->badblocks
);
2222 md_error(mddev
, rdev
);
2224 clear_bit(Blocked
, &rdev
->flags
);
2225 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2226 wake_up(&rdev
->blocked_wait
);
2229 wake_up(&mddev
->sb_wait
);
2233 spin_lock_irq(&mddev
->write_lock
);
2235 mddev
->utime
= get_seconds();
2237 if (test_and_clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
))
2239 if (test_and_clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
2240 /* just a clean<-> dirty transition, possibly leave spares alone,
2241 * though if events isn't the right even/odd, we will have to do
2247 if (mddev
->degraded
)
2248 /* If the array is degraded, then skipping spares is both
2249 * dangerous and fairly pointless.
2250 * Dangerous because a device that was removed from the array
2251 * might have a event_count that still looks up-to-date,
2252 * so it can be re-added without a resync.
2253 * Pointless because if there are any spares to skip,
2254 * then a recovery will happen and soon that array won't
2255 * be degraded any more and the spare can go back to sleep then.
2259 sync_req
= mddev
->in_sync
;
2261 /* If this is just a dirty<->clean transition, and the array is clean
2262 * and 'events' is odd, we can roll back to the previous clean state */
2264 && (mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
2265 && mddev
->can_decrease_events
2266 && mddev
->events
!= 1) {
2268 mddev
->can_decrease_events
= 0;
2270 /* otherwise we have to go forward and ... */
2272 mddev
->can_decrease_events
= nospares
;
2276 * This 64-bit counter should never wrap.
2277 * Either we are in around ~1 trillion A.C., assuming
2278 * 1 reboot per second, or we have a bug...
2280 WARN_ON(mddev
->events
== 0);
2282 rdev_for_each(rdev
, mddev
) {
2283 if (rdev
->badblocks
.changed
)
2284 any_badblocks_changed
++;
2285 if (test_bit(Faulty
, &rdev
->flags
))
2286 set_bit(FaultRecorded
, &rdev
->flags
);
2289 sync_sbs(mddev
, nospares
);
2290 spin_unlock_irq(&mddev
->write_lock
);
2292 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2293 mdname(mddev
), mddev
->in_sync
);
2295 bitmap_update_sb(mddev
->bitmap
);
2296 rdev_for_each(rdev
, mddev
) {
2297 char b
[BDEVNAME_SIZE
];
2299 if (rdev
->sb_loaded
!= 1)
2300 continue; /* no noise on spare devices */
2302 if (!test_bit(Faulty
, &rdev
->flags
)) {
2303 md_super_write(mddev
,rdev
,
2304 rdev
->sb_start
, rdev
->sb_size
,
2306 pr_debug("md: (write) %s's sb offset: %llu\n",
2307 bdevname(rdev
->bdev
, b
),
2308 (unsigned long long)rdev
->sb_start
);
2309 rdev
->sb_events
= mddev
->events
;
2310 if (rdev
->badblocks
.size
) {
2311 md_super_write(mddev
, rdev
,
2312 rdev
->badblocks
.sector
,
2313 rdev
->badblocks
.size
<< 9,
2315 rdev
->badblocks
.size
= 0;
2319 pr_debug("md: %s (skipping faulty)\n",
2320 bdevname(rdev
->bdev
, b
));
2322 if (mddev
->level
== LEVEL_MULTIPATH
)
2323 /* only need to write one superblock... */
2326 md_super_wait(mddev
);
2327 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2329 spin_lock_irq(&mddev
->write_lock
);
2330 if (mddev
->in_sync
!= sync_req
||
2331 test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
2332 /* have to write it out again */
2333 spin_unlock_irq(&mddev
->write_lock
);
2336 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2337 spin_unlock_irq(&mddev
->write_lock
);
2338 wake_up(&mddev
->sb_wait
);
2339 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
2340 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
2342 rdev_for_each(rdev
, mddev
) {
2343 if (test_and_clear_bit(FaultRecorded
, &rdev
->flags
))
2344 clear_bit(Blocked
, &rdev
->flags
);
2346 if (any_badblocks_changed
)
2347 md_ack_all_badblocks(&rdev
->badblocks
);
2348 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2349 wake_up(&rdev
->blocked_wait
);
2353 /* words written to sysfs files may, or may not, be \n terminated.
2354 * We want to accept with case. For this we use cmd_match.
2356 static int cmd_match(const char *cmd
, const char *str
)
2358 /* See if cmd, written into a sysfs file, matches
2359 * str. They must either be the same, or cmd can
2360 * have a trailing newline
2362 while (*cmd
&& *str
&& *cmd
== *str
) {
2373 struct rdev_sysfs_entry
{
2374 struct attribute attr
;
2375 ssize_t (*show
)(struct md_rdev
*, char *);
2376 ssize_t (*store
)(struct md_rdev
*, const char *, size_t);
2380 state_show(struct md_rdev
*rdev
, char *page
)
2385 if (test_bit(Faulty
, &rdev
->flags
) ||
2386 rdev
->badblocks
.unacked_exist
) {
2387 len
+= sprintf(page
+len
, "%sfaulty",sep
);
2390 if (test_bit(In_sync
, &rdev
->flags
)) {
2391 len
+= sprintf(page
+len
, "%sin_sync",sep
);
2394 if (test_bit(WriteMostly
, &rdev
->flags
)) {
2395 len
+= sprintf(page
+len
, "%swrite_mostly",sep
);
2398 if (test_bit(Blocked
, &rdev
->flags
) ||
2399 (rdev
->badblocks
.unacked_exist
2400 && !test_bit(Faulty
, &rdev
->flags
))) {
2401 len
+= sprintf(page
+len
, "%sblocked", sep
);
2404 if (!test_bit(Faulty
, &rdev
->flags
) &&
2405 !test_bit(In_sync
, &rdev
->flags
)) {
2406 len
+= sprintf(page
+len
, "%sspare", sep
);
2409 if (test_bit(WriteErrorSeen
, &rdev
->flags
)) {
2410 len
+= sprintf(page
+len
, "%swrite_error", sep
);
2413 if (test_bit(WantReplacement
, &rdev
->flags
)) {
2414 len
+= sprintf(page
+len
, "%swant_replacement", sep
);
2417 if (test_bit(Replacement
, &rdev
->flags
)) {
2418 len
+= sprintf(page
+len
, "%sreplacement", sep
);
2422 return len
+sprintf(page
+len
, "\n");
2426 state_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2429 * faulty - simulates an error
2430 * remove - disconnects the device
2431 * writemostly - sets write_mostly
2432 * -writemostly - clears write_mostly
2433 * blocked - sets the Blocked flags
2434 * -blocked - clears the Blocked and possibly simulates an error
2435 * insync - sets Insync providing device isn't active
2436 * -insync - clear Insync for a device with a slot assigned,
2437 * so that it gets rebuilt based on bitmap
2438 * write_error - sets WriteErrorSeen
2439 * -write_error - clears WriteErrorSeen
2442 if (cmd_match(buf
, "faulty") && rdev
->mddev
->pers
) {
2443 md_error(rdev
->mddev
, rdev
);
2444 if (test_bit(Faulty
, &rdev
->flags
))
2448 } else if (cmd_match(buf
, "remove")) {
2449 if (rdev
->raid_disk
>= 0)
2452 struct mddev
*mddev
= rdev
->mddev
;
2453 kick_rdev_from_array(rdev
);
2455 md_update_sb(mddev
, 1);
2456 md_new_event(mddev
);
2459 } else if (cmd_match(buf
, "writemostly")) {
2460 set_bit(WriteMostly
, &rdev
->flags
);
2462 } else if (cmd_match(buf
, "-writemostly")) {
2463 clear_bit(WriteMostly
, &rdev
->flags
);
2465 } else if (cmd_match(buf
, "blocked")) {
2466 set_bit(Blocked
, &rdev
->flags
);
2468 } else if (cmd_match(buf
, "-blocked")) {
2469 if (!test_bit(Faulty
, &rdev
->flags
) &&
2470 rdev
->badblocks
.unacked_exist
) {
2471 /* metadata handler doesn't understand badblocks,
2472 * so we need to fail the device
2474 md_error(rdev
->mddev
, rdev
);
2476 clear_bit(Blocked
, &rdev
->flags
);
2477 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2478 wake_up(&rdev
->blocked_wait
);
2479 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2480 md_wakeup_thread(rdev
->mddev
->thread
);
2483 } else if (cmd_match(buf
, "insync") && rdev
->raid_disk
== -1) {
2484 set_bit(In_sync
, &rdev
->flags
);
2486 } else if (cmd_match(buf
, "-insync") && rdev
->raid_disk
>= 0) {
2487 if (rdev
->mddev
->pers
== NULL
) {
2488 clear_bit(In_sync
, &rdev
->flags
);
2489 rdev
->saved_raid_disk
= rdev
->raid_disk
;
2490 rdev
->raid_disk
= -1;
2493 } else if (cmd_match(buf
, "write_error")) {
2494 set_bit(WriteErrorSeen
, &rdev
->flags
);
2496 } else if (cmd_match(buf
, "-write_error")) {
2497 clear_bit(WriteErrorSeen
, &rdev
->flags
);
2499 } else if (cmd_match(buf
, "want_replacement")) {
2500 /* Any non-spare device that is not a replacement can
2501 * become want_replacement at any time, but we then need to
2502 * check if recovery is needed.
2504 if (rdev
->raid_disk
>= 0 &&
2505 !test_bit(Replacement
, &rdev
->flags
))
2506 set_bit(WantReplacement
, &rdev
->flags
);
2507 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2508 md_wakeup_thread(rdev
->mddev
->thread
);
2510 } else if (cmd_match(buf
, "-want_replacement")) {
2511 /* Clearing 'want_replacement' is always allowed.
2512 * Once replacements starts it is too late though.
2515 clear_bit(WantReplacement
, &rdev
->flags
);
2516 } else if (cmd_match(buf
, "replacement")) {
2517 /* Can only set a device as a replacement when array has not
2518 * yet been started. Once running, replacement is automatic
2519 * from spares, or by assigning 'slot'.
2521 if (rdev
->mddev
->pers
)
2524 set_bit(Replacement
, &rdev
->flags
);
2527 } else if (cmd_match(buf
, "-replacement")) {
2528 /* Similarly, can only clear Replacement before start */
2529 if (rdev
->mddev
->pers
)
2532 clear_bit(Replacement
, &rdev
->flags
);
2537 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2538 return err
? err
: len
;
2540 static struct rdev_sysfs_entry rdev_state
=
2541 __ATTR(state
, S_IRUGO
|S_IWUSR
, state_show
, state_store
);
2544 errors_show(struct md_rdev
*rdev
, char *page
)
2546 return sprintf(page
, "%d\n", atomic_read(&rdev
->corrected_errors
));
2550 errors_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2553 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2554 if (*buf
&& (*e
== 0 || *e
== '\n')) {
2555 atomic_set(&rdev
->corrected_errors
, n
);
2560 static struct rdev_sysfs_entry rdev_errors
=
2561 __ATTR(errors
, S_IRUGO
|S_IWUSR
, errors_show
, errors_store
);
2564 slot_show(struct md_rdev
*rdev
, char *page
)
2566 if (rdev
->raid_disk
< 0)
2567 return sprintf(page
, "none\n");
2569 return sprintf(page
, "%d\n", rdev
->raid_disk
);
2573 slot_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2577 int slot
= simple_strtoul(buf
, &e
, 10);
2578 if (strncmp(buf
, "none", 4)==0)
2580 else if (e
==buf
|| (*e
&& *e
!= '\n'))
2582 if (rdev
->mddev
->pers
&& slot
== -1) {
2583 /* Setting 'slot' on an active array requires also
2584 * updating the 'rd%d' link, and communicating
2585 * with the personality with ->hot_*_disk.
2586 * For now we only support removing
2587 * failed/spare devices. This normally happens automatically,
2588 * but not when the metadata is externally managed.
2590 if (rdev
->raid_disk
== -1)
2592 /* personality does all needed checks */
2593 if (rdev
->mddev
->pers
->hot_remove_disk
== NULL
)
2595 clear_bit(Blocked
, &rdev
->flags
);
2596 remove_and_add_spares(rdev
->mddev
, rdev
);
2597 if (rdev
->raid_disk
>= 0)
2599 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2600 md_wakeup_thread(rdev
->mddev
->thread
);
2601 } else if (rdev
->mddev
->pers
) {
2602 /* Activating a spare .. or possibly reactivating
2603 * if we ever get bitmaps working here.
2606 if (rdev
->raid_disk
!= -1)
2609 if (test_bit(MD_RECOVERY_RUNNING
, &rdev
->mddev
->recovery
))
2612 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
2615 if (slot
>= rdev
->mddev
->raid_disks
&&
2616 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
2619 rdev
->raid_disk
= slot
;
2620 if (test_bit(In_sync
, &rdev
->flags
))
2621 rdev
->saved_raid_disk
= slot
;
2623 rdev
->saved_raid_disk
= -1;
2624 clear_bit(In_sync
, &rdev
->flags
);
2625 clear_bit(Bitmap_sync
, &rdev
->flags
);
2626 err
= rdev
->mddev
->pers
->
2627 hot_add_disk(rdev
->mddev
, rdev
);
2629 rdev
->raid_disk
= -1;
2632 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2633 if (sysfs_link_rdev(rdev
->mddev
, rdev
))
2634 /* failure here is OK */;
2635 /* don't wakeup anyone, leave that to userspace. */
2637 if (slot
>= rdev
->mddev
->raid_disks
&&
2638 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
2640 rdev
->raid_disk
= slot
;
2641 /* assume it is working */
2642 clear_bit(Faulty
, &rdev
->flags
);
2643 clear_bit(WriteMostly
, &rdev
->flags
);
2644 set_bit(In_sync
, &rdev
->flags
);
2645 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2650 static struct rdev_sysfs_entry rdev_slot
=
2651 __ATTR(slot
, S_IRUGO
|S_IWUSR
, slot_show
, slot_store
);
2654 offset_show(struct md_rdev
*rdev
, char *page
)
2656 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->data_offset
);
2660 offset_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2662 unsigned long long offset
;
2663 if (kstrtoull(buf
, 10, &offset
) < 0)
2665 if (rdev
->mddev
->pers
&& rdev
->raid_disk
>= 0)
2667 if (rdev
->sectors
&& rdev
->mddev
->external
)
2668 /* Must set offset before size, so overlap checks
2671 rdev
->data_offset
= offset
;
2672 rdev
->new_data_offset
= offset
;
2676 static struct rdev_sysfs_entry rdev_offset
=
2677 __ATTR(offset
, S_IRUGO
|S_IWUSR
, offset_show
, offset_store
);
2679 static ssize_t
new_offset_show(struct md_rdev
*rdev
, char *page
)
2681 return sprintf(page
, "%llu\n",
2682 (unsigned long long)rdev
->new_data_offset
);
2685 static ssize_t
new_offset_store(struct md_rdev
*rdev
,
2686 const char *buf
, size_t len
)
2688 unsigned long long new_offset
;
2689 struct mddev
*mddev
= rdev
->mddev
;
2691 if (kstrtoull(buf
, 10, &new_offset
) < 0)
2694 if (mddev
->sync_thread
||
2695 test_bit(MD_RECOVERY_RUNNING
,&mddev
->recovery
))
2697 if (new_offset
== rdev
->data_offset
)
2698 /* reset is always permitted */
2700 else if (new_offset
> rdev
->data_offset
) {
2701 /* must not push array size beyond rdev_sectors */
2702 if (new_offset
- rdev
->data_offset
2703 + mddev
->dev_sectors
> rdev
->sectors
)
2706 /* Metadata worries about other space details. */
2708 /* decreasing the offset is inconsistent with a backwards
2711 if (new_offset
< rdev
->data_offset
&&
2712 mddev
->reshape_backwards
)
2714 /* Increasing offset is inconsistent with forwards
2715 * reshape. reshape_direction should be set to
2716 * 'backwards' first.
2718 if (new_offset
> rdev
->data_offset
&&
2719 !mddev
->reshape_backwards
)
2722 if (mddev
->pers
&& mddev
->persistent
&&
2723 !super_types
[mddev
->major_version
]
2724 .allow_new_offset(rdev
, new_offset
))
2726 rdev
->new_data_offset
= new_offset
;
2727 if (new_offset
> rdev
->data_offset
)
2728 mddev
->reshape_backwards
= 1;
2729 else if (new_offset
< rdev
->data_offset
)
2730 mddev
->reshape_backwards
= 0;
2734 static struct rdev_sysfs_entry rdev_new_offset
=
2735 __ATTR(new_offset
, S_IRUGO
|S_IWUSR
, new_offset_show
, new_offset_store
);
2738 rdev_size_show(struct md_rdev
*rdev
, char *page
)
2740 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->sectors
/ 2);
2743 static int overlaps(sector_t s1
, sector_t l1
, sector_t s2
, sector_t l2
)
2745 /* check if two start/length pairs overlap */
2753 static int strict_blocks_to_sectors(const char *buf
, sector_t
*sectors
)
2755 unsigned long long blocks
;
2758 if (kstrtoull(buf
, 10, &blocks
) < 0)
2761 if (blocks
& 1ULL << (8 * sizeof(blocks
) - 1))
2762 return -EINVAL
; /* sector conversion overflow */
2765 if (new != blocks
* 2)
2766 return -EINVAL
; /* unsigned long long to sector_t overflow */
2773 rdev_size_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2775 struct mddev
*my_mddev
= rdev
->mddev
;
2776 sector_t oldsectors
= rdev
->sectors
;
2779 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
2781 if (rdev
->data_offset
!= rdev
->new_data_offset
)
2782 return -EINVAL
; /* too confusing */
2783 if (my_mddev
->pers
&& rdev
->raid_disk
>= 0) {
2784 if (my_mddev
->persistent
) {
2785 sectors
= super_types
[my_mddev
->major_version
].
2786 rdev_size_change(rdev
, sectors
);
2789 } else if (!sectors
)
2790 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) -
2792 if (!my_mddev
->pers
->resize
)
2793 /* Cannot change size for RAID0 or Linear etc */
2796 if (sectors
< my_mddev
->dev_sectors
)
2797 return -EINVAL
; /* component must fit device */
2799 rdev
->sectors
= sectors
;
2800 if (sectors
> oldsectors
&& my_mddev
->external
) {
2801 /* Need to check that all other rdevs with the same
2802 * ->bdev do not overlap. 'rcu' is sufficient to walk
2803 * the rdev lists safely.
2804 * This check does not provide a hard guarantee, it
2805 * just helps avoid dangerous mistakes.
2807 struct mddev
*mddev
;
2809 struct list_head
*tmp
;
2812 for_each_mddev(mddev
, tmp
) {
2813 struct md_rdev
*rdev2
;
2815 rdev_for_each(rdev2
, mddev
)
2816 if (rdev
->bdev
== rdev2
->bdev
&&
2818 overlaps(rdev
->data_offset
, rdev
->sectors
,
2831 /* Someone else could have slipped in a size
2832 * change here, but doing so is just silly.
2833 * We put oldsectors back because we *know* it is
2834 * safe, and trust userspace not to race with
2837 rdev
->sectors
= oldsectors
;
2844 static struct rdev_sysfs_entry rdev_size
=
2845 __ATTR(size
, S_IRUGO
|S_IWUSR
, rdev_size_show
, rdev_size_store
);
2847 static ssize_t
recovery_start_show(struct md_rdev
*rdev
, char *page
)
2849 unsigned long long recovery_start
= rdev
->recovery_offset
;
2851 if (test_bit(In_sync
, &rdev
->flags
) ||
2852 recovery_start
== MaxSector
)
2853 return sprintf(page
, "none\n");
2855 return sprintf(page
, "%llu\n", recovery_start
);
2858 static ssize_t
recovery_start_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2860 unsigned long long recovery_start
;
2862 if (cmd_match(buf
, "none"))
2863 recovery_start
= MaxSector
;
2864 else if (kstrtoull(buf
, 10, &recovery_start
))
2867 if (rdev
->mddev
->pers
&&
2868 rdev
->raid_disk
>= 0)
2871 rdev
->recovery_offset
= recovery_start
;
2872 if (recovery_start
== MaxSector
)
2873 set_bit(In_sync
, &rdev
->flags
);
2875 clear_bit(In_sync
, &rdev
->flags
);
2879 static struct rdev_sysfs_entry rdev_recovery_start
=
2880 __ATTR(recovery_start
, S_IRUGO
|S_IWUSR
, recovery_start_show
, recovery_start_store
);
2883 badblocks_show(struct badblocks
*bb
, char *page
, int unack
);
2885 badblocks_store(struct badblocks
*bb
, const char *page
, size_t len
, int unack
);
2887 static ssize_t
bb_show(struct md_rdev
*rdev
, char *page
)
2889 return badblocks_show(&rdev
->badblocks
, page
, 0);
2891 static ssize_t
bb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
2893 int rv
= badblocks_store(&rdev
->badblocks
, page
, len
, 0);
2894 /* Maybe that ack was all we needed */
2895 if (test_and_clear_bit(BlockedBadBlocks
, &rdev
->flags
))
2896 wake_up(&rdev
->blocked_wait
);
2899 static struct rdev_sysfs_entry rdev_bad_blocks
=
2900 __ATTR(bad_blocks
, S_IRUGO
|S_IWUSR
, bb_show
, bb_store
);
2902 static ssize_t
ubb_show(struct md_rdev
*rdev
, char *page
)
2904 return badblocks_show(&rdev
->badblocks
, page
, 1);
2906 static ssize_t
ubb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
2908 return badblocks_store(&rdev
->badblocks
, page
, len
, 1);
2910 static struct rdev_sysfs_entry rdev_unack_bad_blocks
=
2911 __ATTR(unacknowledged_bad_blocks
, S_IRUGO
|S_IWUSR
, ubb_show
, ubb_store
);
2913 static struct attribute
*rdev_default_attrs
[] = {
2918 &rdev_new_offset
.attr
,
2920 &rdev_recovery_start
.attr
,
2921 &rdev_bad_blocks
.attr
,
2922 &rdev_unack_bad_blocks
.attr
,
2926 rdev_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
2928 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
2929 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
2930 struct mddev
*mddev
= rdev
->mddev
;
2936 rv
= mddev
? mddev_lock(mddev
) : -EBUSY
;
2938 if (rdev
->mddev
== NULL
)
2941 rv
= entry
->show(rdev
, page
);
2942 mddev_unlock(mddev
);
2948 rdev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
2949 const char *page
, size_t length
)
2951 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
2952 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
2954 struct mddev
*mddev
= rdev
->mddev
;
2958 if (!capable(CAP_SYS_ADMIN
))
2960 rv
= mddev
? mddev_lock(mddev
): -EBUSY
;
2962 if (rdev
->mddev
== NULL
)
2965 rv
= entry
->store(rdev
, page
, length
);
2966 mddev_unlock(mddev
);
2971 static void rdev_free(struct kobject
*ko
)
2973 struct md_rdev
*rdev
= container_of(ko
, struct md_rdev
, kobj
);
2976 static const struct sysfs_ops rdev_sysfs_ops
= {
2977 .show
= rdev_attr_show
,
2978 .store
= rdev_attr_store
,
2980 static struct kobj_type rdev_ktype
= {
2981 .release
= rdev_free
,
2982 .sysfs_ops
= &rdev_sysfs_ops
,
2983 .default_attrs
= rdev_default_attrs
,
2986 int md_rdev_init(struct md_rdev
*rdev
)
2989 rdev
->saved_raid_disk
= -1;
2990 rdev
->raid_disk
= -1;
2992 rdev
->data_offset
= 0;
2993 rdev
->new_data_offset
= 0;
2994 rdev
->sb_events
= 0;
2995 rdev
->last_read_error
.tv_sec
= 0;
2996 rdev
->last_read_error
.tv_nsec
= 0;
2997 rdev
->sb_loaded
= 0;
2998 rdev
->bb_page
= NULL
;
2999 atomic_set(&rdev
->nr_pending
, 0);
3000 atomic_set(&rdev
->read_errors
, 0);
3001 atomic_set(&rdev
->corrected_errors
, 0);
3003 INIT_LIST_HEAD(&rdev
->same_set
);
3004 init_waitqueue_head(&rdev
->blocked_wait
);
3006 /* Add space to store bad block list.
3007 * This reserves the space even on arrays where it cannot
3008 * be used - I wonder if that matters
3010 rdev
->badblocks
.count
= 0;
3011 rdev
->badblocks
.shift
= -1; /* disabled until explicitly enabled */
3012 rdev
->badblocks
.page
= kmalloc(PAGE_SIZE
, GFP_KERNEL
);
3013 seqlock_init(&rdev
->badblocks
.lock
);
3014 if (rdev
->badblocks
.page
== NULL
)
3019 EXPORT_SYMBOL_GPL(md_rdev_init
);
3021 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3023 * mark the device faulty if:
3025 * - the device is nonexistent (zero size)
3026 * - the device has no valid superblock
3028 * a faulty rdev _never_ has rdev->sb set.
3030 static struct md_rdev
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
3032 char b
[BDEVNAME_SIZE
];
3034 struct md_rdev
*rdev
;
3037 rdev
= kzalloc(sizeof(*rdev
), GFP_KERNEL
);
3039 printk(KERN_ERR
"md: could not alloc mem for new device!\n");
3040 return ERR_PTR(-ENOMEM
);
3043 err
= md_rdev_init(rdev
);
3046 err
= alloc_disk_sb(rdev
);
3050 err
= lock_rdev(rdev
, newdev
, super_format
== -2);
3054 kobject_init(&rdev
->kobj
, &rdev_ktype
);
3056 size
= i_size_read(rdev
->bdev
->bd_inode
) >> BLOCK_SIZE_BITS
;
3059 "md: %s has zero or unknown size, marking faulty!\n",
3060 bdevname(rdev
->bdev
,b
));
3065 if (super_format
>= 0) {
3066 err
= super_types
[super_format
].
3067 load_super(rdev
, NULL
, super_minor
);
3068 if (err
== -EINVAL
) {
3070 "md: %s does not have a valid v%d.%d "
3071 "superblock, not importing!\n",
3072 bdevname(rdev
->bdev
,b
),
3073 super_format
, super_minor
);
3078 "md: could not read %s's sb, not importing!\n",
3079 bdevname(rdev
->bdev
,b
));
3089 md_rdev_clear(rdev
);
3091 return ERR_PTR(err
);
3095 * Check a full RAID array for plausibility
3098 static void analyze_sbs(struct mddev
*mddev
)
3101 struct md_rdev
*rdev
, *freshest
, *tmp
;
3102 char b
[BDEVNAME_SIZE
];
3105 rdev_for_each_safe(rdev
, tmp
, mddev
)
3106 switch (super_types
[mddev
->major_version
].
3107 load_super(rdev
, freshest
, mddev
->minor_version
)) {
3115 "md: fatal superblock inconsistency in %s"
3116 " -- removing from array\n",
3117 bdevname(rdev
->bdev
,b
));
3118 kick_rdev_from_array(rdev
);
3121 super_types
[mddev
->major_version
].
3122 validate_super(mddev
, freshest
);
3125 rdev_for_each_safe(rdev
, tmp
, mddev
) {
3126 if (mddev
->max_disks
&&
3127 (rdev
->desc_nr
>= mddev
->max_disks
||
3128 i
> mddev
->max_disks
)) {
3130 "md: %s: %s: only %d devices permitted\n",
3131 mdname(mddev
), bdevname(rdev
->bdev
, b
),
3133 kick_rdev_from_array(rdev
);
3136 if (rdev
!= freshest
)
3137 if (super_types
[mddev
->major_version
].
3138 validate_super(mddev
, rdev
)) {
3139 printk(KERN_WARNING
"md: kicking non-fresh %s"
3141 bdevname(rdev
->bdev
,b
));
3142 kick_rdev_from_array(rdev
);
3145 if (mddev
->level
== LEVEL_MULTIPATH
) {
3146 rdev
->desc_nr
= i
++;
3147 rdev
->raid_disk
= rdev
->desc_nr
;
3148 set_bit(In_sync
, &rdev
->flags
);
3149 } else if (rdev
->raid_disk
>= (mddev
->raid_disks
- min(0, mddev
->delta_disks
))) {
3150 rdev
->raid_disk
= -1;
3151 clear_bit(In_sync
, &rdev
->flags
);
3156 /* Read a fixed-point number.
3157 * Numbers in sysfs attributes should be in "standard" units where
3158 * possible, so time should be in seconds.
3159 * However we internally use a a much smaller unit such as
3160 * milliseconds or jiffies.
3161 * This function takes a decimal number with a possible fractional
3162 * component, and produces an integer which is the result of
3163 * multiplying that number by 10^'scale'.
3164 * all without any floating-point arithmetic.
3166 int strict_strtoul_scaled(const char *cp
, unsigned long *res
, int scale
)
3168 unsigned long result
= 0;
3170 while (isdigit(*cp
) || (*cp
== '.' && decimals
< 0)) {
3173 else if (decimals
< scale
) {
3176 result
= result
* 10 + value
;
3188 while (decimals
< scale
) {
3196 static void md_safemode_timeout(unsigned long data
);
3199 safe_delay_show(struct mddev
*mddev
, char *page
)
3201 int msec
= (mddev
->safemode_delay
*1000)/HZ
;
3202 return sprintf(page
, "%d.%03d\n", msec
/1000, msec
%1000);
3205 safe_delay_store(struct mddev
*mddev
, const char *cbuf
, size_t len
)
3209 if (strict_strtoul_scaled(cbuf
, &msec
, 3) < 0)
3212 mddev
->safemode_delay
= 0;
3214 unsigned long old_delay
= mddev
->safemode_delay
;
3215 mddev
->safemode_delay
= (msec
*HZ
)/1000;
3216 if (mddev
->safemode_delay
== 0)
3217 mddev
->safemode_delay
= 1;
3218 if (mddev
->safemode_delay
< old_delay
|| old_delay
== 0)
3219 md_safemode_timeout((unsigned long)mddev
);
3223 static struct md_sysfs_entry md_safe_delay
=
3224 __ATTR(safe_mode_delay
, S_IRUGO
|S_IWUSR
,safe_delay_show
, safe_delay_store
);
3227 level_show(struct mddev
*mddev
, char *page
)
3229 struct md_personality
*p
= mddev
->pers
;
3231 return sprintf(page
, "%s\n", p
->name
);
3232 else if (mddev
->clevel
[0])
3233 return sprintf(page
, "%s\n", mddev
->clevel
);
3234 else if (mddev
->level
!= LEVEL_NONE
)
3235 return sprintf(page
, "%d\n", mddev
->level
);
3241 level_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3245 struct md_personality
*pers
;
3248 struct md_rdev
*rdev
;
3250 if (mddev
->pers
== NULL
) {
3253 if (len
>= sizeof(mddev
->clevel
))
3255 strncpy(mddev
->clevel
, buf
, len
);
3256 if (mddev
->clevel
[len
-1] == '\n')
3258 mddev
->clevel
[len
] = 0;
3259 mddev
->level
= LEVEL_NONE
;
3265 /* request to change the personality. Need to ensure:
3266 * - array is not engaged in resync/recovery/reshape
3267 * - old personality can be suspended
3268 * - new personality will access other array.
3271 if (mddev
->sync_thread
||
3272 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
3273 mddev
->reshape_position
!= MaxSector
||
3274 mddev
->sysfs_active
)
3277 if (!mddev
->pers
->quiesce
) {
3278 printk(KERN_WARNING
"md: %s: %s does not support online personality change\n",
3279 mdname(mddev
), mddev
->pers
->name
);
3283 /* Now find the new personality */
3284 if (len
== 0 || len
>= sizeof(clevel
))
3286 strncpy(clevel
, buf
, len
);
3287 if (clevel
[len
-1] == '\n')
3290 if (kstrtol(clevel
, 10, &level
))
3293 if (request_module("md-%s", clevel
) != 0)
3294 request_module("md-level-%s", clevel
);
3295 spin_lock(&pers_lock
);
3296 pers
= find_pers(level
, clevel
);
3297 if (!pers
|| !try_module_get(pers
->owner
)) {
3298 spin_unlock(&pers_lock
);
3299 printk(KERN_WARNING
"md: personality %s not loaded\n", clevel
);
3302 spin_unlock(&pers_lock
);
3304 if (pers
== mddev
->pers
) {
3305 /* Nothing to do! */
3306 module_put(pers
->owner
);
3309 if (!pers
->takeover
) {
3310 module_put(pers
->owner
);
3311 printk(KERN_WARNING
"md: %s: %s does not support personality takeover\n",
3312 mdname(mddev
), clevel
);
3316 rdev_for_each(rdev
, mddev
)
3317 rdev
->new_raid_disk
= rdev
->raid_disk
;
3319 /* ->takeover must set new_* and/or delta_disks
3320 * if it succeeds, and may set them when it fails.
3322 priv
= pers
->takeover(mddev
);
3324 mddev
->new_level
= mddev
->level
;
3325 mddev
->new_layout
= mddev
->layout
;
3326 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3327 mddev
->raid_disks
-= mddev
->delta_disks
;
3328 mddev
->delta_disks
= 0;
3329 mddev
->reshape_backwards
= 0;
3330 module_put(pers
->owner
);
3331 printk(KERN_WARNING
"md: %s: %s would not accept array\n",
3332 mdname(mddev
), clevel
);
3333 return PTR_ERR(priv
);
3336 /* Looks like we have a winner */
3337 mddev_suspend(mddev
);
3338 mddev
->pers
->stop(mddev
);
3340 if (mddev
->pers
->sync_request
== NULL
&&
3341 pers
->sync_request
!= NULL
) {
3342 /* need to add the md_redundancy_group */
3343 if (sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
3345 "md: cannot register extra attributes for %s\n",
3347 mddev
->sysfs_action
= sysfs_get_dirent(mddev
->kobj
.sd
, "sync_action");
3349 if (mddev
->pers
->sync_request
!= NULL
&&
3350 pers
->sync_request
== NULL
) {
3351 /* need to remove the md_redundancy_group */
3352 if (mddev
->to_remove
== NULL
)
3353 mddev
->to_remove
= &md_redundancy_group
;
3356 if (mddev
->pers
->sync_request
== NULL
&&
3358 /* We are converting from a no-redundancy array
3359 * to a redundancy array and metadata is managed
3360 * externally so we need to be sure that writes
3361 * won't block due to a need to transition
3363 * until external management is started.
3366 mddev
->safemode_delay
= 0;
3367 mddev
->safemode
= 0;
3370 rdev_for_each(rdev
, mddev
) {
3371 if (rdev
->raid_disk
< 0)
3373 if (rdev
->new_raid_disk
>= mddev
->raid_disks
)
3374 rdev
->new_raid_disk
= -1;
3375 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3377 sysfs_unlink_rdev(mddev
, rdev
);
3379 rdev_for_each(rdev
, mddev
) {
3380 if (rdev
->raid_disk
< 0)
3382 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3384 rdev
->raid_disk
= rdev
->new_raid_disk
;
3385 if (rdev
->raid_disk
< 0)
3386 clear_bit(In_sync
, &rdev
->flags
);
3388 if (sysfs_link_rdev(mddev
, rdev
))
3389 printk(KERN_WARNING
"md: cannot register rd%d"
3390 " for %s after level change\n",
3391 rdev
->raid_disk
, mdname(mddev
));
3395 module_put(mddev
->pers
->owner
);
3397 mddev
->private = priv
;
3398 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
3399 mddev
->level
= mddev
->new_level
;
3400 mddev
->layout
= mddev
->new_layout
;
3401 mddev
->chunk_sectors
= mddev
->new_chunk_sectors
;
3402 mddev
->delta_disks
= 0;
3403 mddev
->reshape_backwards
= 0;
3404 mddev
->degraded
= 0;
3405 if (mddev
->pers
->sync_request
== NULL
) {
3406 /* this is now an array without redundancy, so
3407 * it must always be in_sync
3410 del_timer_sync(&mddev
->safemode_timer
);
3412 blk_set_stacking_limits(&mddev
->queue
->limits
);
3414 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
3415 mddev_resume(mddev
);
3417 md_update_sb(mddev
, 1);
3418 sysfs_notify(&mddev
->kobj
, NULL
, "level");
3419 md_new_event(mddev
);
3423 static struct md_sysfs_entry md_level
=
3424 __ATTR(level
, S_IRUGO
|S_IWUSR
, level_show
, level_store
);
3427 layout_show(struct mddev
*mddev
, char *page
)
3429 /* just a number, not meaningful for all levels */
3430 if (mddev
->reshape_position
!= MaxSector
&&
3431 mddev
->layout
!= mddev
->new_layout
)
3432 return sprintf(page
, "%d (%d)\n",
3433 mddev
->new_layout
, mddev
->layout
);
3434 return sprintf(page
, "%d\n", mddev
->layout
);
3438 layout_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3441 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3443 if (!*buf
|| (*e
&& *e
!= '\n'))
3448 if (mddev
->pers
->check_reshape
== NULL
)
3452 mddev
->new_layout
= n
;
3453 err
= mddev
->pers
->check_reshape(mddev
);
3455 mddev
->new_layout
= mddev
->layout
;
3459 mddev
->new_layout
= n
;
3460 if (mddev
->reshape_position
== MaxSector
)
3465 static struct md_sysfs_entry md_layout
=
3466 __ATTR(layout
, S_IRUGO
|S_IWUSR
, layout_show
, layout_store
);
3469 raid_disks_show(struct mddev
*mddev
, char *page
)
3471 if (mddev
->raid_disks
== 0)
3473 if (mddev
->reshape_position
!= MaxSector
&&
3474 mddev
->delta_disks
!= 0)
3475 return sprintf(page
, "%d (%d)\n", mddev
->raid_disks
,
3476 mddev
->raid_disks
- mddev
->delta_disks
);
3477 return sprintf(page
, "%d\n", mddev
->raid_disks
);
3480 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
);
3483 raid_disks_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3487 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3489 if (!*buf
|| (*e
&& *e
!= '\n'))
3493 rv
= update_raid_disks(mddev
, n
);
3494 else if (mddev
->reshape_position
!= MaxSector
) {
3495 struct md_rdev
*rdev
;
3496 int olddisks
= mddev
->raid_disks
- mddev
->delta_disks
;
3498 rdev_for_each(rdev
, mddev
) {
3500 rdev
->data_offset
< rdev
->new_data_offset
)
3503 rdev
->data_offset
> rdev
->new_data_offset
)
3506 mddev
->delta_disks
= n
- olddisks
;
3507 mddev
->raid_disks
= n
;
3508 mddev
->reshape_backwards
= (mddev
->delta_disks
< 0);
3510 mddev
->raid_disks
= n
;
3511 return rv
? rv
: len
;
3513 static struct md_sysfs_entry md_raid_disks
=
3514 __ATTR(raid_disks
, S_IRUGO
|S_IWUSR
, raid_disks_show
, raid_disks_store
);
3517 chunk_size_show(struct mddev
*mddev
, char *page
)
3519 if (mddev
->reshape_position
!= MaxSector
&&
3520 mddev
->chunk_sectors
!= mddev
->new_chunk_sectors
)
3521 return sprintf(page
, "%d (%d)\n",
3522 mddev
->new_chunk_sectors
<< 9,
3523 mddev
->chunk_sectors
<< 9);
3524 return sprintf(page
, "%d\n", mddev
->chunk_sectors
<< 9);
3528 chunk_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3531 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3533 if (!*buf
|| (*e
&& *e
!= '\n'))
3538 if (mddev
->pers
->check_reshape
== NULL
)
3542 mddev
->new_chunk_sectors
= n
>> 9;
3543 err
= mddev
->pers
->check_reshape(mddev
);
3545 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3549 mddev
->new_chunk_sectors
= n
>> 9;
3550 if (mddev
->reshape_position
== MaxSector
)
3551 mddev
->chunk_sectors
= n
>> 9;
3555 static struct md_sysfs_entry md_chunk_size
=
3556 __ATTR(chunk_size
, S_IRUGO
|S_IWUSR
, chunk_size_show
, chunk_size_store
);
3559 resync_start_show(struct mddev
*mddev
, char *page
)
3561 if (mddev
->recovery_cp
== MaxSector
)
3562 return sprintf(page
, "none\n");
3563 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->recovery_cp
);
3567 resync_start_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3570 unsigned long long n
= simple_strtoull(buf
, &e
, 10);
3572 if (mddev
->pers
&& !test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
3574 if (cmd_match(buf
, "none"))
3576 else if (!*buf
|| (*e
&& *e
!= '\n'))
3579 mddev
->recovery_cp
= n
;
3581 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
3584 static struct md_sysfs_entry md_resync_start
=
3585 __ATTR(resync_start
, S_IRUGO
|S_IWUSR
, resync_start_show
, resync_start_store
);
3588 * The array state can be:
3591 * No devices, no size, no level
3592 * Equivalent to STOP_ARRAY ioctl
3594 * May have some settings, but array is not active
3595 * all IO results in error
3596 * When written, doesn't tear down array, but just stops it
3597 * suspended (not supported yet)
3598 * All IO requests will block. The array can be reconfigured.
3599 * Writing this, if accepted, will block until array is quiescent
3601 * no resync can happen. no superblocks get written.
3602 * write requests fail
3604 * like readonly, but behaves like 'clean' on a write request.
3606 * clean - no pending writes, but otherwise active.
3607 * When written to inactive array, starts without resync
3608 * If a write request arrives then
3609 * if metadata is known, mark 'dirty' and switch to 'active'.
3610 * if not known, block and switch to write-pending
3611 * If written to an active array that has pending writes, then fails.
3613 * fully active: IO and resync can be happening.
3614 * When written to inactive array, starts with resync
3617 * clean, but writes are blocked waiting for 'active' to be written.
3620 * like active, but no writes have been seen for a while (100msec).
3623 enum array_state
{ clear
, inactive
, suspended
, readonly
, read_auto
, clean
, active
,
3624 write_pending
, active_idle
, bad_word
};
3625 static char *array_states
[] = {
3626 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3627 "write-pending", "active-idle", NULL
};
3629 static int match_word(const char *word
, char **list
)
3632 for (n
=0; list
[n
]; n
++)
3633 if (cmd_match(word
, list
[n
]))
3639 array_state_show(struct mddev
*mddev
, char *page
)
3641 enum array_state st
= inactive
;
3654 else if (test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
3656 else if (mddev
->safemode
)
3662 if (list_empty(&mddev
->disks
) &&
3663 mddev
->raid_disks
== 0 &&
3664 mddev
->dev_sectors
== 0)
3669 return sprintf(page
, "%s\n", array_states
[st
]);
3672 static int do_md_stop(struct mddev
*mddev
, int ro
, struct block_device
*bdev
);
3673 static int md_set_readonly(struct mddev
*mddev
, struct block_device
*bdev
);
3674 static int do_md_run(struct mddev
*mddev
);
3675 static int restart_array(struct mddev
*mddev
);
3678 array_state_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3681 enum array_state st
= match_word(buf
, array_states
);
3686 /* stopping an active array */
3687 err
= do_md_stop(mddev
, 0, NULL
);
3690 /* stopping an active array */
3692 err
= do_md_stop(mddev
, 2, NULL
);
3694 err
= 0; /* already inactive */
3697 break; /* not supported yet */
3700 err
= md_set_readonly(mddev
, NULL
);
3703 set_disk_ro(mddev
->gendisk
, 1);
3704 err
= do_md_run(mddev
);
3710 err
= md_set_readonly(mddev
, NULL
);
3711 else if (mddev
->ro
== 1)
3712 err
= restart_array(mddev
);
3715 set_disk_ro(mddev
->gendisk
, 0);
3719 err
= do_md_run(mddev
);
3724 restart_array(mddev
);
3725 spin_lock_irq(&mddev
->write_lock
);
3726 if (atomic_read(&mddev
->writes_pending
) == 0) {
3727 if (mddev
->in_sync
== 0) {
3729 if (mddev
->safemode
== 1)
3730 mddev
->safemode
= 0;
3731 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
3736 spin_unlock_irq(&mddev
->write_lock
);
3742 restart_array(mddev
);
3743 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
3744 wake_up(&mddev
->sb_wait
);
3748 set_disk_ro(mddev
->gendisk
, 0);
3749 err
= do_md_run(mddev
);
3754 /* these cannot be set */
3760 if (mddev
->hold_active
== UNTIL_IOCTL
)
3761 mddev
->hold_active
= 0;
3762 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
3766 static struct md_sysfs_entry md_array_state
=
3767 __ATTR(array_state
, S_IRUGO
|S_IWUSR
, array_state_show
, array_state_store
);
3770 max_corrected_read_errors_show(struct mddev
*mddev
, char *page
) {
3771 return sprintf(page
, "%d\n",
3772 atomic_read(&mddev
->max_corr_read_errors
));
3776 max_corrected_read_errors_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3779 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3781 if (*buf
&& (*e
== 0 || *e
== '\n')) {
3782 atomic_set(&mddev
->max_corr_read_errors
, n
);
3788 static struct md_sysfs_entry max_corr_read_errors
=
3789 __ATTR(max_read_errors
, S_IRUGO
|S_IWUSR
, max_corrected_read_errors_show
,
3790 max_corrected_read_errors_store
);
3793 null_show(struct mddev
*mddev
, char *page
)
3799 new_dev_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3801 /* buf must be %d:%d\n? giving major and minor numbers */
3802 /* The new device is added to the array.
3803 * If the array has a persistent superblock, we read the
3804 * superblock to initialise info and check validity.
3805 * Otherwise, only checking done is that in bind_rdev_to_array,
3806 * which mainly checks size.
3809 int major
= simple_strtoul(buf
, &e
, 10);
3812 struct md_rdev
*rdev
;
3815 if (!*buf
|| *e
!= ':' || !e
[1] || e
[1] == '\n')
3817 minor
= simple_strtoul(e
+1, &e
, 10);
3818 if (*e
&& *e
!= '\n')
3820 dev
= MKDEV(major
, minor
);
3821 if (major
!= MAJOR(dev
) ||
3822 minor
!= MINOR(dev
))
3825 if (mddev
->persistent
) {
3826 rdev
= md_import_device(dev
, mddev
->major_version
,
3827 mddev
->minor_version
);
3828 if (!IS_ERR(rdev
) && !list_empty(&mddev
->disks
)) {
3829 struct md_rdev
*rdev0
3830 = list_entry(mddev
->disks
.next
,
3831 struct md_rdev
, same_set
);
3832 err
= super_types
[mddev
->major_version
]
3833 .load_super(rdev
, rdev0
, mddev
->minor_version
);
3837 } else if (mddev
->external
)
3838 rdev
= md_import_device(dev
, -2, -1);
3840 rdev
= md_import_device(dev
, -1, -1);
3843 return PTR_ERR(rdev
);
3844 err
= bind_rdev_to_array(rdev
, mddev
);
3848 return err
? err
: len
;
3851 static struct md_sysfs_entry md_new_device
=
3852 __ATTR(new_dev
, S_IWUSR
, null_show
, new_dev_store
);
3855 bitmap_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3858 unsigned long chunk
, end_chunk
;
3862 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
3864 chunk
= end_chunk
= simple_strtoul(buf
, &end
, 0);
3865 if (buf
== end
) break;
3866 if (*end
== '-') { /* range */
3868 end_chunk
= simple_strtoul(buf
, &end
, 0);
3869 if (buf
== end
) break;
3871 if (*end
&& !isspace(*end
)) break;
3872 bitmap_dirty_bits(mddev
->bitmap
, chunk
, end_chunk
);
3873 buf
= skip_spaces(end
);
3875 bitmap_unplug(mddev
->bitmap
); /* flush the bits to disk */
3880 static struct md_sysfs_entry md_bitmap
=
3881 __ATTR(bitmap_set_bits
, S_IWUSR
, null_show
, bitmap_store
);
3884 size_show(struct mddev
*mddev
, char *page
)
3886 return sprintf(page
, "%llu\n",
3887 (unsigned long long)mddev
->dev_sectors
/ 2);
3890 static int update_size(struct mddev
*mddev
, sector_t num_sectors
);
3893 size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3895 /* If array is inactive, we can reduce the component size, but
3896 * not increase it (except from 0).
3897 * If array is active, we can try an on-line resize
3900 int err
= strict_blocks_to_sectors(buf
, §ors
);
3905 err
= update_size(mddev
, sectors
);
3906 md_update_sb(mddev
, 1);
3908 if (mddev
->dev_sectors
== 0 ||
3909 mddev
->dev_sectors
> sectors
)
3910 mddev
->dev_sectors
= sectors
;
3914 return err
? err
: len
;
3917 static struct md_sysfs_entry md_size
=
3918 __ATTR(component_size
, S_IRUGO
|S_IWUSR
, size_show
, size_store
);
3920 /* Metadata version.
3922 * 'none' for arrays with no metadata (good luck...)
3923 * 'external' for arrays with externally managed metadata,
3924 * or N.M for internally known formats
3927 metadata_show(struct mddev
*mddev
, char *page
)
3929 if (mddev
->persistent
)
3930 return sprintf(page
, "%d.%d\n",
3931 mddev
->major_version
, mddev
->minor_version
);
3932 else if (mddev
->external
)
3933 return sprintf(page
, "external:%s\n", mddev
->metadata_type
);
3935 return sprintf(page
, "none\n");
3939 metadata_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3943 /* Changing the details of 'external' metadata is
3944 * always permitted. Otherwise there must be
3945 * no devices attached to the array.
3947 if (mddev
->external
&& strncmp(buf
, "external:", 9) == 0)
3949 else if (!list_empty(&mddev
->disks
))
3952 if (cmd_match(buf
, "none")) {
3953 mddev
->persistent
= 0;
3954 mddev
->external
= 0;
3955 mddev
->major_version
= 0;
3956 mddev
->minor_version
= 90;
3959 if (strncmp(buf
, "external:", 9) == 0) {
3960 size_t namelen
= len
-9;
3961 if (namelen
>= sizeof(mddev
->metadata_type
))
3962 namelen
= sizeof(mddev
->metadata_type
)-1;
3963 strncpy(mddev
->metadata_type
, buf
+9, namelen
);
3964 mddev
->metadata_type
[namelen
] = 0;
3965 if (namelen
&& mddev
->metadata_type
[namelen
-1] == '\n')
3966 mddev
->metadata_type
[--namelen
] = 0;
3967 mddev
->persistent
= 0;
3968 mddev
->external
= 1;
3969 mddev
->major_version
= 0;
3970 mddev
->minor_version
= 90;
3973 major
= simple_strtoul(buf
, &e
, 10);
3974 if (e
==buf
|| *e
!= '.')
3977 minor
= simple_strtoul(buf
, &e
, 10);
3978 if (e
==buf
|| (*e
&& *e
!= '\n') )
3980 if (major
>= ARRAY_SIZE(super_types
) || super_types
[major
].name
== NULL
)
3982 mddev
->major_version
= major
;
3983 mddev
->minor_version
= minor
;
3984 mddev
->persistent
= 1;
3985 mddev
->external
= 0;
3989 static struct md_sysfs_entry md_metadata
=
3990 __ATTR(metadata_version
, S_IRUGO
|S_IWUSR
, metadata_show
, metadata_store
);
3993 action_show(struct mddev
*mddev
, char *page
)
3995 char *type
= "idle";
3996 if (test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
3998 else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
3999 (!mddev
->ro
&& test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))) {
4000 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
4002 else if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
4003 if (!test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
4005 else if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
4009 } else if (test_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
))
4012 return sprintf(page
, "%s\n", type
);
4016 action_store(struct mddev
*mddev
, const char *page
, size_t len
)
4018 if (!mddev
->pers
|| !mddev
->pers
->sync_request
)
4021 if (cmd_match(page
, "frozen"))
4022 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4024 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4026 if (cmd_match(page
, "idle") || cmd_match(page
, "frozen")) {
4027 flush_workqueue(md_misc_wq
);
4028 if (mddev
->sync_thread
) {
4029 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4030 md_reap_sync_thread(mddev
);
4032 } else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
4033 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
4035 else if (cmd_match(page
, "resync"))
4036 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4037 else if (cmd_match(page
, "recover")) {
4038 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
4039 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4040 } else if (cmd_match(page
, "reshape")) {
4042 if (mddev
->pers
->start_reshape
== NULL
)
4044 err
= mddev
->pers
->start_reshape(mddev
);
4047 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
4049 if (cmd_match(page
, "check"))
4050 set_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
4051 else if (!cmd_match(page
, "repair"))
4053 set_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
4054 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
4056 if (mddev
->ro
== 2) {
4057 /* A write to sync_action is enough to justify
4058 * canceling read-auto mode
4061 md_wakeup_thread(mddev
->sync_thread
);
4063 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4064 md_wakeup_thread(mddev
->thread
);
4065 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
4069 static struct md_sysfs_entry md_scan_mode
=
4070 __ATTR(sync_action
, S_IRUGO
|S_IWUSR
, action_show
, action_store
);
4073 last_sync_action_show(struct mddev
*mddev
, char *page
)
4075 return sprintf(page
, "%s\n", mddev
->last_sync_action
);
4078 static struct md_sysfs_entry md_last_scan_mode
= __ATTR_RO(last_sync_action
);
4081 mismatch_cnt_show(struct mddev
*mddev
, char *page
)
4083 return sprintf(page
, "%llu\n",
4084 (unsigned long long)
4085 atomic64_read(&mddev
->resync_mismatches
));
4088 static struct md_sysfs_entry md_mismatches
= __ATTR_RO(mismatch_cnt
);
4091 sync_min_show(struct mddev
*mddev
, char *page
)
4093 return sprintf(page
, "%d (%s)\n", speed_min(mddev
),
4094 mddev
->sync_speed_min
? "local": "system");
4098 sync_min_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4102 if (strncmp(buf
, "system", 6)==0) {
4103 mddev
->sync_speed_min
= 0;
4106 min
= simple_strtoul(buf
, &e
, 10);
4107 if (buf
== e
|| (*e
&& *e
!= '\n') || min
<= 0)
4109 mddev
->sync_speed_min
= min
;
4113 static struct md_sysfs_entry md_sync_min
=
4114 __ATTR(sync_speed_min
, S_IRUGO
|S_IWUSR
, sync_min_show
, sync_min_store
);
4117 sync_max_show(struct mddev
*mddev
, char *page
)
4119 return sprintf(page
, "%d (%s)\n", speed_max(mddev
),
4120 mddev
->sync_speed_max
? "local": "system");
4124 sync_max_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4128 if (strncmp(buf
, "system", 6)==0) {
4129 mddev
->sync_speed_max
= 0;
4132 max
= simple_strtoul(buf
, &e
, 10);
4133 if (buf
== e
|| (*e
&& *e
!= '\n') || max
<= 0)
4135 mddev
->sync_speed_max
= max
;
4139 static struct md_sysfs_entry md_sync_max
=
4140 __ATTR(sync_speed_max
, S_IRUGO
|S_IWUSR
, sync_max_show
, sync_max_store
);
4143 degraded_show(struct mddev
*mddev
, char *page
)
4145 return sprintf(page
, "%d\n", mddev
->degraded
);
4147 static struct md_sysfs_entry md_degraded
= __ATTR_RO(degraded
);
4150 sync_force_parallel_show(struct mddev
*mddev
, char *page
)
4152 return sprintf(page
, "%d\n", mddev
->parallel_resync
);
4156 sync_force_parallel_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4160 if (kstrtol(buf
, 10, &n
))
4163 if (n
!= 0 && n
!= 1)
4166 mddev
->parallel_resync
= n
;
4168 if (mddev
->sync_thread
)
4169 wake_up(&resync_wait
);
4174 /* force parallel resync, even with shared block devices */
4175 static struct md_sysfs_entry md_sync_force_parallel
=
4176 __ATTR(sync_force_parallel
, S_IRUGO
|S_IWUSR
,
4177 sync_force_parallel_show
, sync_force_parallel_store
);
4180 sync_speed_show(struct mddev
*mddev
, char *page
)
4182 unsigned long resync
, dt
, db
;
4183 if (mddev
->curr_resync
== 0)
4184 return sprintf(page
, "none\n");
4185 resync
= mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
);
4186 dt
= (jiffies
- mddev
->resync_mark
) / HZ
;
4188 db
= resync
- mddev
->resync_mark_cnt
;
4189 return sprintf(page
, "%lu\n", db
/dt
/2); /* K/sec */
4192 static struct md_sysfs_entry md_sync_speed
= __ATTR_RO(sync_speed
);
4195 sync_completed_show(struct mddev
*mddev
, char *page
)
4197 unsigned long long max_sectors
, resync
;
4199 if (!test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4200 return sprintf(page
, "none\n");
4202 if (mddev
->curr_resync
== 1 ||
4203 mddev
->curr_resync
== 2)
4204 return sprintf(page
, "delayed\n");
4206 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
4207 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
4208 max_sectors
= mddev
->resync_max_sectors
;
4210 max_sectors
= mddev
->dev_sectors
;
4212 resync
= mddev
->curr_resync_completed
;
4213 return sprintf(page
, "%llu / %llu\n", resync
, max_sectors
);
4216 static struct md_sysfs_entry md_sync_completed
= __ATTR_RO(sync_completed
);
4219 min_sync_show(struct mddev
*mddev
, char *page
)
4221 return sprintf(page
, "%llu\n",
4222 (unsigned long long)mddev
->resync_min
);
4225 min_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4227 unsigned long long min
;
4228 if (kstrtoull(buf
, 10, &min
))
4230 if (min
> mddev
->resync_max
)
4232 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4235 /* Must be a multiple of chunk_size */
4236 if (mddev
->chunk_sectors
) {
4237 sector_t temp
= min
;
4238 if (sector_div(temp
, mddev
->chunk_sectors
))
4241 mddev
->resync_min
= min
;
4246 static struct md_sysfs_entry md_min_sync
=
4247 __ATTR(sync_min
, S_IRUGO
|S_IWUSR
, min_sync_show
, min_sync_store
);
4250 max_sync_show(struct mddev
*mddev
, char *page
)
4252 if (mddev
->resync_max
== MaxSector
)
4253 return sprintf(page
, "max\n");
4255 return sprintf(page
, "%llu\n",
4256 (unsigned long long)mddev
->resync_max
);
4259 max_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4261 if (strncmp(buf
, "max", 3) == 0)
4262 mddev
->resync_max
= MaxSector
;
4264 unsigned long long max
;
4265 if (kstrtoull(buf
, 10, &max
))
4267 if (max
< mddev
->resync_min
)
4269 if (max
< mddev
->resync_max
&&
4271 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4274 /* Must be a multiple of chunk_size */
4275 if (mddev
->chunk_sectors
) {
4276 sector_t temp
= max
;
4277 if (sector_div(temp
, mddev
->chunk_sectors
))
4280 mddev
->resync_max
= max
;
4282 wake_up(&mddev
->recovery_wait
);
4286 static struct md_sysfs_entry md_max_sync
=
4287 __ATTR(sync_max
, S_IRUGO
|S_IWUSR
, max_sync_show
, max_sync_store
);
4290 suspend_lo_show(struct mddev
*mddev
, char *page
)
4292 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_lo
);
4296 suspend_lo_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4299 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4300 unsigned long long old
= mddev
->suspend_lo
;
4302 if (mddev
->pers
== NULL
||
4303 mddev
->pers
->quiesce
== NULL
)
4305 if (buf
== e
|| (*e
&& *e
!= '\n'))
4308 mddev
->suspend_lo
= new;
4310 /* Shrinking suspended region */
4311 mddev
->pers
->quiesce(mddev
, 2);
4313 /* Expanding suspended region - need to wait */
4314 mddev
->pers
->quiesce(mddev
, 1);
4315 mddev
->pers
->quiesce(mddev
, 0);
4319 static struct md_sysfs_entry md_suspend_lo
=
4320 __ATTR(suspend_lo
, S_IRUGO
|S_IWUSR
, suspend_lo_show
, suspend_lo_store
);
4323 suspend_hi_show(struct mddev
*mddev
, char *page
)
4325 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_hi
);
4329 suspend_hi_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4332 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4333 unsigned long long old
= mddev
->suspend_hi
;
4335 if (mddev
->pers
== NULL
||
4336 mddev
->pers
->quiesce
== NULL
)
4338 if (buf
== e
|| (*e
&& *e
!= '\n'))
4341 mddev
->suspend_hi
= new;
4343 /* Shrinking suspended region */
4344 mddev
->pers
->quiesce(mddev
, 2);
4346 /* Expanding suspended region - need to wait */
4347 mddev
->pers
->quiesce(mddev
, 1);
4348 mddev
->pers
->quiesce(mddev
, 0);
4352 static struct md_sysfs_entry md_suspend_hi
=
4353 __ATTR(suspend_hi
, S_IRUGO
|S_IWUSR
, suspend_hi_show
, suspend_hi_store
);
4356 reshape_position_show(struct mddev
*mddev
, char *page
)
4358 if (mddev
->reshape_position
!= MaxSector
)
4359 return sprintf(page
, "%llu\n",
4360 (unsigned long long)mddev
->reshape_position
);
4361 strcpy(page
, "none\n");
4366 reshape_position_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4368 struct md_rdev
*rdev
;
4370 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4373 if (buf
== e
|| (*e
&& *e
!= '\n'))
4375 mddev
->reshape_position
= new;
4376 mddev
->delta_disks
= 0;
4377 mddev
->reshape_backwards
= 0;
4378 mddev
->new_level
= mddev
->level
;
4379 mddev
->new_layout
= mddev
->layout
;
4380 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
4381 rdev_for_each(rdev
, mddev
)
4382 rdev
->new_data_offset
= rdev
->data_offset
;
4386 static struct md_sysfs_entry md_reshape_position
=
4387 __ATTR(reshape_position
, S_IRUGO
|S_IWUSR
, reshape_position_show
,
4388 reshape_position_store
);
4391 reshape_direction_show(struct mddev
*mddev
, char *page
)
4393 return sprintf(page
, "%s\n",
4394 mddev
->reshape_backwards
? "backwards" : "forwards");
4398 reshape_direction_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4401 if (cmd_match(buf
, "forwards"))
4403 else if (cmd_match(buf
, "backwards"))
4407 if (mddev
->reshape_backwards
== backwards
)
4410 /* check if we are allowed to change */
4411 if (mddev
->delta_disks
)
4414 if (mddev
->persistent
&&
4415 mddev
->major_version
== 0)
4418 mddev
->reshape_backwards
= backwards
;
4422 static struct md_sysfs_entry md_reshape_direction
=
4423 __ATTR(reshape_direction
, S_IRUGO
|S_IWUSR
, reshape_direction_show
,
4424 reshape_direction_store
);
4427 array_size_show(struct mddev
*mddev
, char *page
)
4429 if (mddev
->external_size
)
4430 return sprintf(page
, "%llu\n",
4431 (unsigned long long)mddev
->array_sectors
/2);
4433 return sprintf(page
, "default\n");
4437 array_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4441 if (strncmp(buf
, "default", 7) == 0) {
4443 sectors
= mddev
->pers
->size(mddev
, 0, 0);
4445 sectors
= mddev
->array_sectors
;
4447 mddev
->external_size
= 0;
4449 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
4451 if (mddev
->pers
&& mddev
->pers
->size(mddev
, 0, 0) < sectors
)
4454 mddev
->external_size
= 1;
4457 mddev
->array_sectors
= sectors
;
4459 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
4460 revalidate_disk(mddev
->gendisk
);
4465 static struct md_sysfs_entry md_array_size
=
4466 __ATTR(array_size
, S_IRUGO
|S_IWUSR
, array_size_show
,
4469 static struct attribute
*md_default_attrs
[] = {
4472 &md_raid_disks
.attr
,
4473 &md_chunk_size
.attr
,
4475 &md_resync_start
.attr
,
4477 &md_new_device
.attr
,
4478 &md_safe_delay
.attr
,
4479 &md_array_state
.attr
,
4480 &md_reshape_position
.attr
,
4481 &md_reshape_direction
.attr
,
4482 &md_array_size
.attr
,
4483 &max_corr_read_errors
.attr
,
4487 static struct attribute
*md_redundancy_attrs
[] = {
4489 &md_last_scan_mode
.attr
,
4490 &md_mismatches
.attr
,
4493 &md_sync_speed
.attr
,
4494 &md_sync_force_parallel
.attr
,
4495 &md_sync_completed
.attr
,
4498 &md_suspend_lo
.attr
,
4499 &md_suspend_hi
.attr
,
4504 static struct attribute_group md_redundancy_group
= {
4506 .attrs
= md_redundancy_attrs
,
4510 md_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
4512 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4513 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
4518 spin_lock(&all_mddevs_lock
);
4519 if (list_empty(&mddev
->all_mddevs
)) {
4520 spin_unlock(&all_mddevs_lock
);
4524 spin_unlock(&all_mddevs_lock
);
4526 rv
= mddev_lock(mddev
);
4528 rv
= entry
->show(mddev
, page
);
4529 mddev_unlock(mddev
);
4536 md_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
4537 const char *page
, size_t length
)
4539 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4540 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
4545 if (!capable(CAP_SYS_ADMIN
))
4547 spin_lock(&all_mddevs_lock
);
4548 if (list_empty(&mddev
->all_mddevs
)) {
4549 spin_unlock(&all_mddevs_lock
);
4553 spin_unlock(&all_mddevs_lock
);
4554 if (entry
->store
== new_dev_store
)
4555 flush_workqueue(md_misc_wq
);
4556 rv
= mddev_lock(mddev
);
4558 rv
= entry
->store(mddev
, page
, length
);
4559 mddev_unlock(mddev
);
4565 static void md_free(struct kobject
*ko
)
4567 struct mddev
*mddev
= container_of(ko
, struct mddev
, kobj
);
4569 if (mddev
->sysfs_state
)
4570 sysfs_put(mddev
->sysfs_state
);
4572 if (mddev
->gendisk
) {
4573 del_gendisk(mddev
->gendisk
);
4574 put_disk(mddev
->gendisk
);
4577 blk_cleanup_queue(mddev
->queue
);
4582 static const struct sysfs_ops md_sysfs_ops
= {
4583 .show
= md_attr_show
,
4584 .store
= md_attr_store
,
4586 static struct kobj_type md_ktype
= {
4588 .sysfs_ops
= &md_sysfs_ops
,
4589 .default_attrs
= md_default_attrs
,
4594 static void mddev_delayed_delete(struct work_struct
*ws
)
4596 struct mddev
*mddev
= container_of(ws
, struct mddev
, del_work
);
4598 sysfs_remove_group(&mddev
->kobj
, &md_bitmap_group
);
4599 kobject_del(&mddev
->kobj
);
4600 kobject_put(&mddev
->kobj
);
4603 static int md_alloc(dev_t dev
, char *name
)
4605 static DEFINE_MUTEX(disks_mutex
);
4606 struct mddev
*mddev
= mddev_find(dev
);
4607 struct gendisk
*disk
;
4616 partitioned
= (MAJOR(mddev
->unit
) != MD_MAJOR
);
4617 shift
= partitioned
? MdpMinorShift
: 0;
4618 unit
= MINOR(mddev
->unit
) >> shift
;
4620 /* wait for any previous instance of this device to be
4621 * completely removed (mddev_delayed_delete).
4623 flush_workqueue(md_misc_wq
);
4625 mutex_lock(&disks_mutex
);
4631 /* Need to ensure that 'name' is not a duplicate.
4633 struct mddev
*mddev2
;
4634 spin_lock(&all_mddevs_lock
);
4636 list_for_each_entry(mddev2
, &all_mddevs
, all_mddevs
)
4637 if (mddev2
->gendisk
&&
4638 strcmp(mddev2
->gendisk
->disk_name
, name
) == 0) {
4639 spin_unlock(&all_mddevs_lock
);
4642 spin_unlock(&all_mddevs_lock
);
4646 mddev
->queue
= blk_alloc_queue(GFP_KERNEL
);
4649 mddev
->queue
->queuedata
= mddev
;
4651 blk_queue_make_request(mddev
->queue
, md_make_request
);
4652 blk_set_stacking_limits(&mddev
->queue
->limits
);
4654 disk
= alloc_disk(1 << shift
);
4656 blk_cleanup_queue(mddev
->queue
);
4657 mddev
->queue
= NULL
;
4660 disk
->major
= MAJOR(mddev
->unit
);
4661 disk
->first_minor
= unit
<< shift
;
4663 strcpy(disk
->disk_name
, name
);
4664 else if (partitioned
)
4665 sprintf(disk
->disk_name
, "md_d%d", unit
);
4667 sprintf(disk
->disk_name
, "md%d", unit
);
4668 disk
->fops
= &md_fops
;
4669 disk
->private_data
= mddev
;
4670 disk
->queue
= mddev
->queue
;
4671 blk_queue_flush(mddev
->queue
, REQ_FLUSH
| REQ_FUA
);
4672 /* Allow extended partitions. This makes the
4673 * 'mdp' device redundant, but we can't really
4676 disk
->flags
|= GENHD_FL_EXT_DEVT
;
4677 mddev
->gendisk
= disk
;
4678 /* As soon as we call add_disk(), another thread could get
4679 * through to md_open, so make sure it doesn't get too far
4681 mutex_lock(&mddev
->open_mutex
);
4684 error
= kobject_init_and_add(&mddev
->kobj
, &md_ktype
,
4685 &disk_to_dev(disk
)->kobj
, "%s", "md");
4687 /* This isn't possible, but as kobject_init_and_add is marked
4688 * __must_check, we must do something with the result
4690 printk(KERN_WARNING
"md: cannot register %s/md - name in use\n",
4694 if (mddev
->kobj
.sd
&&
4695 sysfs_create_group(&mddev
->kobj
, &md_bitmap_group
))
4696 printk(KERN_DEBUG
"pointless warning\n");
4697 mutex_unlock(&mddev
->open_mutex
);
4699 mutex_unlock(&disks_mutex
);
4700 if (!error
&& mddev
->kobj
.sd
) {
4701 kobject_uevent(&mddev
->kobj
, KOBJ_ADD
);
4702 mddev
->sysfs_state
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "array_state");
4708 static struct kobject
*md_probe(dev_t dev
, int *part
, void *data
)
4710 md_alloc(dev
, NULL
);
4714 static int add_named_array(const char *val
, struct kernel_param
*kp
)
4716 /* val must be "md_*" where * is not all digits.
4717 * We allocate an array with a large free minor number, and
4718 * set the name to val. val must not already be an active name.
4720 int len
= strlen(val
);
4721 char buf
[DISK_NAME_LEN
];
4723 while (len
&& val
[len
-1] == '\n')
4725 if (len
>= DISK_NAME_LEN
)
4727 strlcpy(buf
, val
, len
+1);
4728 if (strncmp(buf
, "md_", 3) != 0)
4730 return md_alloc(0, buf
);
4733 static void md_safemode_timeout(unsigned long data
)
4735 struct mddev
*mddev
= (struct mddev
*) data
;
4737 if (!atomic_read(&mddev
->writes_pending
)) {
4738 mddev
->safemode
= 1;
4739 if (mddev
->external
)
4740 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4742 md_wakeup_thread(mddev
->thread
);
4745 static int start_dirty_degraded
;
4747 int md_run(struct mddev
*mddev
)
4750 struct md_rdev
*rdev
;
4751 struct md_personality
*pers
;
4753 if (list_empty(&mddev
->disks
))
4754 /* cannot run an array with no devices.. */
4759 /* Cannot run until previous stop completes properly */
4760 if (mddev
->sysfs_active
)
4764 * Analyze all RAID superblock(s)
4766 if (!mddev
->raid_disks
) {
4767 if (!mddev
->persistent
)
4772 if (mddev
->level
!= LEVEL_NONE
)
4773 request_module("md-level-%d", mddev
->level
);
4774 else if (mddev
->clevel
[0])
4775 request_module("md-%s", mddev
->clevel
);
4778 * Drop all container device buffers, from now on
4779 * the only valid external interface is through the md
4782 rdev_for_each(rdev
, mddev
) {
4783 if (test_bit(Faulty
, &rdev
->flags
))
4785 sync_blockdev(rdev
->bdev
);
4786 invalidate_bdev(rdev
->bdev
);
4788 /* perform some consistency tests on the device.
4789 * We don't want the data to overlap the metadata,
4790 * Internal Bitmap issues have been handled elsewhere.
4792 if (rdev
->meta_bdev
) {
4793 /* Nothing to check */;
4794 } else if (rdev
->data_offset
< rdev
->sb_start
) {
4795 if (mddev
->dev_sectors
&&
4796 rdev
->data_offset
+ mddev
->dev_sectors
4798 printk("md: %s: data overlaps metadata\n",
4803 if (rdev
->sb_start
+ rdev
->sb_size
/512
4804 > rdev
->data_offset
) {
4805 printk("md: %s: metadata overlaps data\n",
4810 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
4813 if (mddev
->bio_set
== NULL
)
4814 mddev
->bio_set
= bioset_create(BIO_POOL_SIZE
, 0);
4816 spin_lock(&pers_lock
);
4817 pers
= find_pers(mddev
->level
, mddev
->clevel
);
4818 if (!pers
|| !try_module_get(pers
->owner
)) {
4819 spin_unlock(&pers_lock
);
4820 if (mddev
->level
!= LEVEL_NONE
)
4821 printk(KERN_WARNING
"md: personality for level %d is not loaded!\n",
4824 printk(KERN_WARNING
"md: personality for level %s is not loaded!\n",
4829 spin_unlock(&pers_lock
);
4830 if (mddev
->level
!= pers
->level
) {
4831 mddev
->level
= pers
->level
;
4832 mddev
->new_level
= pers
->level
;
4834 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
4836 if (mddev
->reshape_position
!= MaxSector
&&
4837 pers
->start_reshape
== NULL
) {
4838 /* This personality cannot handle reshaping... */
4840 module_put(pers
->owner
);
4844 if (pers
->sync_request
) {
4845 /* Warn if this is a potentially silly
4848 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
4849 struct md_rdev
*rdev2
;
4852 rdev_for_each(rdev
, mddev
)
4853 rdev_for_each(rdev2
, mddev
) {
4855 rdev
->bdev
->bd_contains
==
4856 rdev2
->bdev
->bd_contains
) {
4858 "%s: WARNING: %s appears to be"
4859 " on the same physical disk as"
4862 bdevname(rdev
->bdev
,b
),
4863 bdevname(rdev2
->bdev
,b2
));
4870 "True protection against single-disk"
4871 " failure might be compromised.\n");
4874 mddev
->recovery
= 0;
4875 /* may be over-ridden by personality */
4876 mddev
->resync_max_sectors
= mddev
->dev_sectors
;
4878 mddev
->ok_start_degraded
= start_dirty_degraded
;
4880 if (start_readonly
&& mddev
->ro
== 0)
4881 mddev
->ro
= 2; /* read-only, but switch on first write */
4883 err
= mddev
->pers
->run(mddev
);
4885 printk(KERN_ERR
"md: pers->run() failed ...\n");
4886 else if (mddev
->pers
->size(mddev
, 0, 0) < mddev
->array_sectors
) {
4887 WARN_ONCE(!mddev
->external_size
, "%s: default size too small,"
4888 " but 'external_size' not in effect?\n", __func__
);
4890 "md: invalid array_size %llu > default size %llu\n",
4891 (unsigned long long)mddev
->array_sectors
/ 2,
4892 (unsigned long long)mddev
->pers
->size(mddev
, 0, 0) / 2);
4894 mddev
->pers
->stop(mddev
);
4896 if (err
== 0 && mddev
->pers
->sync_request
&&
4897 (mddev
->bitmap_info
.file
|| mddev
->bitmap_info
.offset
)) {
4898 err
= bitmap_create(mddev
);
4900 printk(KERN_ERR
"%s: failed to create bitmap (%d)\n",
4901 mdname(mddev
), err
);
4902 mddev
->pers
->stop(mddev
);
4906 module_put(mddev
->pers
->owner
);
4908 bitmap_destroy(mddev
);
4911 if (mddev
->pers
->sync_request
) {
4912 if (mddev
->kobj
.sd
&&
4913 sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
4915 "md: cannot register extra attributes for %s\n",
4917 mddev
->sysfs_action
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "sync_action");
4918 } else if (mddev
->ro
== 2) /* auto-readonly not meaningful */
4921 atomic_set(&mddev
->writes_pending
,0);
4922 atomic_set(&mddev
->max_corr_read_errors
,
4923 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS
);
4924 mddev
->safemode
= 0;
4925 mddev
->safemode_timer
.function
= md_safemode_timeout
;
4926 mddev
->safemode_timer
.data
= (unsigned long) mddev
;
4927 mddev
->safemode_delay
= (200 * HZ
)/1000 +1; /* 200 msec delay */
4931 rdev_for_each(rdev
, mddev
)
4932 if (rdev
->raid_disk
>= 0)
4933 if (sysfs_link_rdev(mddev
, rdev
))
4934 /* failure here is OK */;
4936 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4938 if (mddev
->flags
& MD_UPDATE_SB_FLAGS
)
4939 md_update_sb(mddev
, 0);
4941 md_new_event(mddev
);
4942 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4943 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
4944 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
4947 EXPORT_SYMBOL_GPL(md_run
);
4949 static int do_md_run(struct mddev
*mddev
)
4953 err
= md_run(mddev
);
4956 err
= bitmap_load(mddev
);
4958 bitmap_destroy(mddev
);
4962 md_wakeup_thread(mddev
->thread
);
4963 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
4965 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
4966 revalidate_disk(mddev
->gendisk
);
4968 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
4973 static int restart_array(struct mddev
*mddev
)
4975 struct gendisk
*disk
= mddev
->gendisk
;
4977 /* Complain if it has no devices */
4978 if (list_empty(&mddev
->disks
))
4984 mddev
->safemode
= 0;
4986 set_disk_ro(disk
, 0);
4987 printk(KERN_INFO
"md: %s switched to read-write mode.\n",
4989 /* Kick recovery or resync if necessary */
4990 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4991 md_wakeup_thread(mddev
->thread
);
4992 md_wakeup_thread(mddev
->sync_thread
);
4993 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4997 static void md_clean(struct mddev
*mddev
)
4999 mddev
->array_sectors
= 0;
5000 mddev
->external_size
= 0;
5001 mddev
->dev_sectors
= 0;
5002 mddev
->raid_disks
= 0;
5003 mddev
->recovery_cp
= 0;
5004 mddev
->resync_min
= 0;
5005 mddev
->resync_max
= MaxSector
;
5006 mddev
->reshape_position
= MaxSector
;
5007 mddev
->external
= 0;
5008 mddev
->persistent
= 0;
5009 mddev
->level
= LEVEL_NONE
;
5010 mddev
->clevel
[0] = 0;
5013 mddev
->metadata_type
[0] = 0;
5014 mddev
->chunk_sectors
= 0;
5015 mddev
->ctime
= mddev
->utime
= 0;
5017 mddev
->max_disks
= 0;
5019 mddev
->can_decrease_events
= 0;
5020 mddev
->delta_disks
= 0;
5021 mddev
->reshape_backwards
= 0;
5022 mddev
->new_level
= LEVEL_NONE
;
5023 mddev
->new_layout
= 0;
5024 mddev
->new_chunk_sectors
= 0;
5025 mddev
->curr_resync
= 0;
5026 atomic64_set(&mddev
->resync_mismatches
, 0);
5027 mddev
->suspend_lo
= mddev
->suspend_hi
= 0;
5028 mddev
->sync_speed_min
= mddev
->sync_speed_max
= 0;
5029 mddev
->recovery
= 0;
5032 mddev
->degraded
= 0;
5033 mddev
->safemode
= 0;
5034 mddev
->merge_check_needed
= 0;
5035 mddev
->bitmap_info
.offset
= 0;
5036 mddev
->bitmap_info
.default_offset
= 0;
5037 mddev
->bitmap_info
.default_space
= 0;
5038 mddev
->bitmap_info
.chunksize
= 0;
5039 mddev
->bitmap_info
.daemon_sleep
= 0;
5040 mddev
->bitmap_info
.max_write_behind
= 0;
5043 static void __md_stop_writes(struct mddev
*mddev
)
5045 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5046 flush_workqueue(md_misc_wq
);
5047 if (mddev
->sync_thread
) {
5048 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5049 md_reap_sync_thread(mddev
);
5052 del_timer_sync(&mddev
->safemode_timer
);
5054 bitmap_flush(mddev
);
5055 md_super_wait(mddev
);
5057 if (mddev
->ro
== 0 &&
5058 (!mddev
->in_sync
|| (mddev
->flags
& MD_UPDATE_SB_FLAGS
))) {
5059 /* mark array as shutdown cleanly */
5061 md_update_sb(mddev
, 1);
5065 void md_stop_writes(struct mddev
*mddev
)
5067 mddev_lock_nointr(mddev
);
5068 __md_stop_writes(mddev
);
5069 mddev_unlock(mddev
);
5071 EXPORT_SYMBOL_GPL(md_stop_writes
);
5073 static void __md_stop(struct mddev
*mddev
)
5076 mddev
->pers
->stop(mddev
);
5077 if (mddev
->pers
->sync_request
&& mddev
->to_remove
== NULL
)
5078 mddev
->to_remove
= &md_redundancy_group
;
5079 module_put(mddev
->pers
->owner
);
5081 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5084 void md_stop(struct mddev
*mddev
)
5086 /* stop the array and free an attached data structures.
5087 * This is called from dm-raid
5090 bitmap_destroy(mddev
);
5092 bioset_free(mddev
->bio_set
);
5095 EXPORT_SYMBOL_GPL(md_stop
);
5097 static int md_set_readonly(struct mddev
*mddev
, struct block_device
*bdev
)
5102 if (!test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
)) {
5104 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5105 md_wakeup_thread(mddev
->thread
);
5107 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
5108 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5109 if (mddev
->sync_thread
)
5110 /* Thread might be blocked waiting for metadata update
5111 * which will now never happen */
5112 wake_up_process(mddev
->sync_thread
->tsk
);
5114 mddev_unlock(mddev
);
5115 wait_event(resync_wait
, !test_bit(MD_RECOVERY_RUNNING
,
5117 mddev_lock_nointr(mddev
);
5119 mutex_lock(&mddev
->open_mutex
);
5120 if ((mddev
->pers
&& atomic_read(&mddev
->openers
) > !!bdev
) ||
5121 mddev
->sync_thread
||
5122 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
5123 (bdev
&& !test_bit(MD_STILL_CLOSED
, &mddev
->flags
))) {
5124 printk("md: %s still in use.\n",mdname(mddev
));
5126 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5127 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5128 md_wakeup_thread(mddev
->thread
);
5134 __md_stop_writes(mddev
);
5140 set_disk_ro(mddev
->gendisk
, 1);
5141 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5142 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5143 md_wakeup_thread(mddev
->thread
);
5144 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5148 mutex_unlock(&mddev
->open_mutex
);
5153 * 0 - completely stop and dis-assemble array
5154 * 2 - stop but do not disassemble array
5156 static int do_md_stop(struct mddev
*mddev
, int mode
,
5157 struct block_device
*bdev
)
5159 struct gendisk
*disk
= mddev
->gendisk
;
5160 struct md_rdev
*rdev
;
5163 if (!test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
)) {
5165 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5166 md_wakeup_thread(mddev
->thread
);
5168 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
5169 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5170 if (mddev
->sync_thread
)
5171 /* Thread might be blocked waiting for metadata update
5172 * which will now never happen */
5173 wake_up_process(mddev
->sync_thread
->tsk
);
5175 mddev_unlock(mddev
);
5176 wait_event(resync_wait
, (mddev
->sync_thread
== NULL
&&
5177 !test_bit(MD_RECOVERY_RUNNING
,
5178 &mddev
->recovery
)));
5179 mddev_lock_nointr(mddev
);
5181 mutex_lock(&mddev
->open_mutex
);
5182 if ((mddev
->pers
&& atomic_read(&mddev
->openers
) > !!bdev
) ||
5183 mddev
->sysfs_active
||
5184 mddev
->sync_thread
||
5185 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
5186 (bdev
&& !test_bit(MD_STILL_CLOSED
, &mddev
->flags
))) {
5187 printk("md: %s still in use.\n",mdname(mddev
));
5188 mutex_unlock(&mddev
->open_mutex
);
5190 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5191 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5192 md_wakeup_thread(mddev
->thread
);
5198 set_disk_ro(disk
, 0);
5200 __md_stop_writes(mddev
);
5202 mddev
->queue
->merge_bvec_fn
= NULL
;
5203 mddev
->queue
->backing_dev_info
.congested_fn
= NULL
;
5205 /* tell userspace to handle 'inactive' */
5206 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5208 rdev_for_each(rdev
, mddev
)
5209 if (rdev
->raid_disk
>= 0)
5210 sysfs_unlink_rdev(mddev
, rdev
);
5212 set_capacity(disk
, 0);
5213 mutex_unlock(&mddev
->open_mutex
);
5215 revalidate_disk(disk
);
5220 mutex_unlock(&mddev
->open_mutex
);
5222 * Free resources if final stop
5225 printk(KERN_INFO
"md: %s stopped.\n", mdname(mddev
));
5227 bitmap_destroy(mddev
);
5228 if (mddev
->bitmap_info
.file
) {
5229 fput(mddev
->bitmap_info
.file
);
5230 mddev
->bitmap_info
.file
= NULL
;
5232 mddev
->bitmap_info
.offset
= 0;
5234 export_array(mddev
);
5237 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
5238 if (mddev
->hold_active
== UNTIL_STOP
)
5239 mddev
->hold_active
= 0;
5241 blk_integrity_unregister(disk
);
5242 md_new_event(mddev
);
5243 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5248 static void autorun_array(struct mddev
*mddev
)
5250 struct md_rdev
*rdev
;
5253 if (list_empty(&mddev
->disks
))
5256 printk(KERN_INFO
"md: running: ");
5258 rdev_for_each(rdev
, mddev
) {
5259 char b
[BDEVNAME_SIZE
];
5260 printk("<%s>", bdevname(rdev
->bdev
,b
));
5264 err
= do_md_run(mddev
);
5266 printk(KERN_WARNING
"md: do_md_run() returned %d\n", err
);
5267 do_md_stop(mddev
, 0, NULL
);
5272 * lets try to run arrays based on all disks that have arrived
5273 * until now. (those are in pending_raid_disks)
5275 * the method: pick the first pending disk, collect all disks with
5276 * the same UUID, remove all from the pending list and put them into
5277 * the 'same_array' list. Then order this list based on superblock
5278 * update time (freshest comes first), kick out 'old' disks and
5279 * compare superblocks. If everything's fine then run it.
5281 * If "unit" is allocated, then bump its reference count
5283 static void autorun_devices(int part
)
5285 struct md_rdev
*rdev0
, *rdev
, *tmp
;
5286 struct mddev
*mddev
;
5287 char b
[BDEVNAME_SIZE
];
5289 printk(KERN_INFO
"md: autorun ...\n");
5290 while (!list_empty(&pending_raid_disks
)) {
5293 LIST_HEAD(candidates
);
5294 rdev0
= list_entry(pending_raid_disks
.next
,
5295 struct md_rdev
, same_set
);
5297 printk(KERN_INFO
"md: considering %s ...\n",
5298 bdevname(rdev0
->bdev
,b
));
5299 INIT_LIST_HEAD(&candidates
);
5300 rdev_for_each_list(rdev
, tmp
, &pending_raid_disks
)
5301 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
5302 printk(KERN_INFO
"md: adding %s ...\n",
5303 bdevname(rdev
->bdev
,b
));
5304 list_move(&rdev
->same_set
, &candidates
);
5307 * now we have a set of devices, with all of them having
5308 * mostly sane superblocks. It's time to allocate the
5312 dev
= MKDEV(mdp_major
,
5313 rdev0
->preferred_minor
<< MdpMinorShift
);
5314 unit
= MINOR(dev
) >> MdpMinorShift
;
5316 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
5319 if (rdev0
->preferred_minor
!= unit
) {
5320 printk(KERN_INFO
"md: unit number in %s is bad: %d\n",
5321 bdevname(rdev0
->bdev
, b
), rdev0
->preferred_minor
);
5325 md_probe(dev
, NULL
, NULL
);
5326 mddev
= mddev_find(dev
);
5327 if (!mddev
|| !mddev
->gendisk
) {
5331 "md: cannot allocate memory for md drive.\n");
5334 if (mddev_lock(mddev
))
5335 printk(KERN_WARNING
"md: %s locked, cannot run\n",
5337 else if (mddev
->raid_disks
|| mddev
->major_version
5338 || !list_empty(&mddev
->disks
)) {
5340 "md: %s already running, cannot run %s\n",
5341 mdname(mddev
), bdevname(rdev0
->bdev
,b
));
5342 mddev_unlock(mddev
);
5344 printk(KERN_INFO
"md: created %s\n", mdname(mddev
));
5345 mddev
->persistent
= 1;
5346 rdev_for_each_list(rdev
, tmp
, &candidates
) {
5347 list_del_init(&rdev
->same_set
);
5348 if (bind_rdev_to_array(rdev
, mddev
))
5351 autorun_array(mddev
);
5352 mddev_unlock(mddev
);
5354 /* on success, candidates will be empty, on error
5357 rdev_for_each_list(rdev
, tmp
, &candidates
) {
5358 list_del_init(&rdev
->same_set
);
5363 printk(KERN_INFO
"md: ... autorun DONE.\n");
5365 #endif /* !MODULE */
5367 static int get_version(void __user
*arg
)
5371 ver
.major
= MD_MAJOR_VERSION
;
5372 ver
.minor
= MD_MINOR_VERSION
;
5373 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
5375 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
5381 static int get_array_info(struct mddev
*mddev
, void __user
*arg
)
5383 mdu_array_info_t info
;
5384 int nr
,working
,insync
,failed
,spare
;
5385 struct md_rdev
*rdev
;
5387 nr
= working
= insync
= failed
= spare
= 0;
5389 rdev_for_each_rcu(rdev
, mddev
) {
5391 if (test_bit(Faulty
, &rdev
->flags
))
5395 if (test_bit(In_sync
, &rdev
->flags
))
5403 info
.major_version
= mddev
->major_version
;
5404 info
.minor_version
= mddev
->minor_version
;
5405 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
5406 info
.ctime
= mddev
->ctime
;
5407 info
.level
= mddev
->level
;
5408 info
.size
= mddev
->dev_sectors
/ 2;
5409 if (info
.size
!= mddev
->dev_sectors
/ 2) /* overflow */
5412 info
.raid_disks
= mddev
->raid_disks
;
5413 info
.md_minor
= mddev
->md_minor
;
5414 info
.not_persistent
= !mddev
->persistent
;
5416 info
.utime
= mddev
->utime
;
5419 info
.state
= (1<<MD_SB_CLEAN
);
5420 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
5421 info
.state
|= (1<<MD_SB_BITMAP_PRESENT
);
5422 info
.active_disks
= insync
;
5423 info
.working_disks
= working
;
5424 info
.failed_disks
= failed
;
5425 info
.spare_disks
= spare
;
5427 info
.layout
= mddev
->layout
;
5428 info
.chunk_size
= mddev
->chunk_sectors
<< 9;
5430 if (copy_to_user(arg
, &info
, sizeof(info
)))
5436 static int get_bitmap_file(struct mddev
*mddev
, void __user
* arg
)
5438 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
5439 char *ptr
, *buf
= NULL
;
5442 file
= kmalloc(sizeof(*file
), GFP_NOIO
);
5447 /* bitmap disabled, zero the first byte and copy out */
5448 if (!mddev
->bitmap
|| !mddev
->bitmap
->storage
.file
) {
5449 file
->pathname
[0] = '\0';
5453 buf
= kmalloc(sizeof(file
->pathname
), GFP_KERNEL
);
5457 ptr
= d_path(&mddev
->bitmap
->storage
.file
->f_path
,
5458 buf
, sizeof(file
->pathname
));
5462 strcpy(file
->pathname
, ptr
);
5466 if (copy_to_user(arg
, file
, sizeof(*file
)))
5474 static int get_disk_info(struct mddev
*mddev
, void __user
* arg
)
5476 mdu_disk_info_t info
;
5477 struct md_rdev
*rdev
;
5479 if (copy_from_user(&info
, arg
, sizeof(info
)))
5483 rdev
= find_rdev_nr_rcu(mddev
, info
.number
);
5485 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
5486 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
5487 info
.raid_disk
= rdev
->raid_disk
;
5489 if (test_bit(Faulty
, &rdev
->flags
))
5490 info
.state
|= (1<<MD_DISK_FAULTY
);
5491 else if (test_bit(In_sync
, &rdev
->flags
)) {
5492 info
.state
|= (1<<MD_DISK_ACTIVE
);
5493 info
.state
|= (1<<MD_DISK_SYNC
);
5495 if (test_bit(WriteMostly
, &rdev
->flags
))
5496 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
5498 info
.major
= info
.minor
= 0;
5499 info
.raid_disk
= -1;
5500 info
.state
= (1<<MD_DISK_REMOVED
);
5504 if (copy_to_user(arg
, &info
, sizeof(info
)))
5510 static int add_new_disk(struct mddev
*mddev
, mdu_disk_info_t
*info
)
5512 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
5513 struct md_rdev
*rdev
;
5514 dev_t dev
= MKDEV(info
->major
,info
->minor
);
5516 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
5519 if (!mddev
->raid_disks
) {
5521 /* expecting a device which has a superblock */
5522 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
5525 "md: md_import_device returned %ld\n",
5527 return PTR_ERR(rdev
);
5529 if (!list_empty(&mddev
->disks
)) {
5530 struct md_rdev
*rdev0
5531 = list_entry(mddev
->disks
.next
,
5532 struct md_rdev
, same_set
);
5533 err
= super_types
[mddev
->major_version
]
5534 .load_super(rdev
, rdev0
, mddev
->minor_version
);
5537 "md: %s has different UUID to %s\n",
5538 bdevname(rdev
->bdev
,b
),
5539 bdevname(rdev0
->bdev
,b2
));
5544 err
= bind_rdev_to_array(rdev
, mddev
);
5551 * add_new_disk can be used once the array is assembled
5552 * to add "hot spares". They must already have a superblock
5557 if (!mddev
->pers
->hot_add_disk
) {
5559 "%s: personality does not support diskops!\n",
5563 if (mddev
->persistent
)
5564 rdev
= md_import_device(dev
, mddev
->major_version
,
5565 mddev
->minor_version
);
5567 rdev
= md_import_device(dev
, -1, -1);
5570 "md: md_import_device returned %ld\n",
5572 return PTR_ERR(rdev
);
5574 /* set saved_raid_disk if appropriate */
5575 if (!mddev
->persistent
) {
5576 if (info
->state
& (1<<MD_DISK_SYNC
) &&
5577 info
->raid_disk
< mddev
->raid_disks
) {
5578 rdev
->raid_disk
= info
->raid_disk
;
5579 set_bit(In_sync
, &rdev
->flags
);
5580 clear_bit(Bitmap_sync
, &rdev
->flags
);
5582 rdev
->raid_disk
= -1;
5583 rdev
->saved_raid_disk
= rdev
->raid_disk
;
5585 super_types
[mddev
->major_version
].
5586 validate_super(mddev
, rdev
);
5587 if ((info
->state
& (1<<MD_DISK_SYNC
)) &&
5588 rdev
->raid_disk
!= info
->raid_disk
) {
5589 /* This was a hot-add request, but events doesn't
5590 * match, so reject it.
5596 clear_bit(In_sync
, &rdev
->flags
); /* just to be sure */
5597 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
5598 set_bit(WriteMostly
, &rdev
->flags
);
5600 clear_bit(WriteMostly
, &rdev
->flags
);
5602 rdev
->raid_disk
= -1;
5603 err
= bind_rdev_to_array(rdev
, mddev
);
5604 if (!err
&& !mddev
->pers
->hot_remove_disk
) {
5605 /* If there is hot_add_disk but no hot_remove_disk
5606 * then added disks for geometry changes,
5607 * and should be added immediately.
5609 super_types
[mddev
->major_version
].
5610 validate_super(mddev
, rdev
);
5611 err
= mddev
->pers
->hot_add_disk(mddev
, rdev
);
5613 unbind_rdev_from_array(rdev
);
5618 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
5620 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
5621 if (mddev
->degraded
)
5622 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
5623 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5625 md_new_event(mddev
);
5626 md_wakeup_thread(mddev
->thread
);
5630 /* otherwise, add_new_disk is only allowed
5631 * for major_version==0 superblocks
5633 if (mddev
->major_version
!= 0) {
5634 printk(KERN_WARNING
"%s: ADD_NEW_DISK not supported\n",
5639 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
5641 rdev
= md_import_device(dev
, -1, 0);
5644 "md: error, md_import_device() returned %ld\n",
5646 return PTR_ERR(rdev
);
5648 rdev
->desc_nr
= info
->number
;
5649 if (info
->raid_disk
< mddev
->raid_disks
)
5650 rdev
->raid_disk
= info
->raid_disk
;
5652 rdev
->raid_disk
= -1;
5654 if (rdev
->raid_disk
< mddev
->raid_disks
)
5655 if (info
->state
& (1<<MD_DISK_SYNC
))
5656 set_bit(In_sync
, &rdev
->flags
);
5658 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
5659 set_bit(WriteMostly
, &rdev
->flags
);
5661 if (!mddev
->persistent
) {
5662 printk(KERN_INFO
"md: nonpersistent superblock ...\n");
5663 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
5665 rdev
->sb_start
= calc_dev_sboffset(rdev
);
5666 rdev
->sectors
= rdev
->sb_start
;
5668 err
= bind_rdev_to_array(rdev
, mddev
);
5678 static int hot_remove_disk(struct mddev
*mddev
, dev_t dev
)
5680 char b
[BDEVNAME_SIZE
];
5681 struct md_rdev
*rdev
;
5683 rdev
= find_rdev(mddev
, dev
);
5687 clear_bit(Blocked
, &rdev
->flags
);
5688 remove_and_add_spares(mddev
, rdev
);
5690 if (rdev
->raid_disk
>= 0)
5693 kick_rdev_from_array(rdev
);
5694 md_update_sb(mddev
, 1);
5695 md_new_event(mddev
);
5699 printk(KERN_WARNING
"md: cannot remove active disk %s from %s ...\n",
5700 bdevname(rdev
->bdev
,b
), mdname(mddev
));
5704 static int hot_add_disk(struct mddev
*mddev
, dev_t dev
)
5706 char b
[BDEVNAME_SIZE
];
5708 struct md_rdev
*rdev
;
5713 if (mddev
->major_version
!= 0) {
5714 printk(KERN_WARNING
"%s: HOT_ADD may only be used with"
5715 " version-0 superblocks.\n",
5719 if (!mddev
->pers
->hot_add_disk
) {
5721 "%s: personality does not support diskops!\n",
5726 rdev
= md_import_device(dev
, -1, 0);
5729 "md: error, md_import_device() returned %ld\n",
5734 if (mddev
->persistent
)
5735 rdev
->sb_start
= calc_dev_sboffset(rdev
);
5737 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
5739 rdev
->sectors
= rdev
->sb_start
;
5741 if (test_bit(Faulty
, &rdev
->flags
)) {
5743 "md: can not hot-add faulty %s disk to %s!\n",
5744 bdevname(rdev
->bdev
,b
), mdname(mddev
));
5748 clear_bit(In_sync
, &rdev
->flags
);
5750 rdev
->saved_raid_disk
= -1;
5751 err
= bind_rdev_to_array(rdev
, mddev
);
5756 * The rest should better be atomic, we can have disk failures
5757 * noticed in interrupt contexts ...
5760 rdev
->raid_disk
= -1;
5762 md_update_sb(mddev
, 1);
5765 * Kick recovery, maybe this spare has to be added to the
5766 * array immediately.
5768 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5769 md_wakeup_thread(mddev
->thread
);
5770 md_new_event(mddev
);
5778 static int set_bitmap_file(struct mddev
*mddev
, int fd
)
5783 if (!mddev
->pers
->quiesce
|| !mddev
->thread
)
5785 if (mddev
->recovery
|| mddev
->sync_thread
)
5787 /* we should be able to change the bitmap.. */
5791 struct inode
*inode
;
5793 return -EEXIST
; /* cannot add when bitmap is present */
5794 mddev
->bitmap_info
.file
= fget(fd
);
5796 if (mddev
->bitmap_info
.file
== NULL
) {
5797 printk(KERN_ERR
"%s: error: failed to get bitmap file\n",
5802 inode
= mddev
->bitmap_info
.file
->f_mapping
->host
;
5803 if (!S_ISREG(inode
->i_mode
)) {
5804 printk(KERN_ERR
"%s: error: bitmap file must be a regular file\n",
5807 } else if (!(mddev
->bitmap_info
.file
->f_mode
& FMODE_WRITE
)) {
5808 printk(KERN_ERR
"%s: error: bitmap file must open for write\n",
5811 } else if (atomic_read(&inode
->i_writecount
) != 1) {
5812 printk(KERN_ERR
"%s: error: bitmap file is already in use\n",
5817 fput(mddev
->bitmap_info
.file
);
5818 mddev
->bitmap_info
.file
= NULL
;
5821 mddev
->bitmap_info
.offset
= 0; /* file overrides offset */
5822 } else if (mddev
->bitmap
== NULL
)
5823 return -ENOENT
; /* cannot remove what isn't there */
5826 mddev
->pers
->quiesce(mddev
, 1);
5828 err
= bitmap_create(mddev
);
5830 err
= bitmap_load(mddev
);
5832 if (fd
< 0 || err
) {
5833 bitmap_destroy(mddev
);
5834 fd
= -1; /* make sure to put the file */
5836 mddev
->pers
->quiesce(mddev
, 0);
5839 if (mddev
->bitmap_info
.file
)
5840 fput(mddev
->bitmap_info
.file
);
5841 mddev
->bitmap_info
.file
= NULL
;
5848 * set_array_info is used two different ways
5849 * The original usage is when creating a new array.
5850 * In this usage, raid_disks is > 0 and it together with
5851 * level, size, not_persistent,layout,chunksize determine the
5852 * shape of the array.
5853 * This will always create an array with a type-0.90.0 superblock.
5854 * The newer usage is when assembling an array.
5855 * In this case raid_disks will be 0, and the major_version field is
5856 * use to determine which style super-blocks are to be found on the devices.
5857 * The minor and patch _version numbers are also kept incase the
5858 * super_block handler wishes to interpret them.
5860 static int set_array_info(struct mddev
*mddev
, mdu_array_info_t
*info
)
5863 if (info
->raid_disks
== 0) {
5864 /* just setting version number for superblock loading */
5865 if (info
->major_version
< 0 ||
5866 info
->major_version
>= ARRAY_SIZE(super_types
) ||
5867 super_types
[info
->major_version
].name
== NULL
) {
5868 /* maybe try to auto-load a module? */
5870 "md: superblock version %d not known\n",
5871 info
->major_version
);
5874 mddev
->major_version
= info
->major_version
;
5875 mddev
->minor_version
= info
->minor_version
;
5876 mddev
->patch_version
= info
->patch_version
;
5877 mddev
->persistent
= !info
->not_persistent
;
5878 /* ensure mddev_put doesn't delete this now that there
5879 * is some minimal configuration.
5881 mddev
->ctime
= get_seconds();
5884 mddev
->major_version
= MD_MAJOR_VERSION
;
5885 mddev
->minor_version
= MD_MINOR_VERSION
;
5886 mddev
->patch_version
= MD_PATCHLEVEL_VERSION
;
5887 mddev
->ctime
= get_seconds();
5889 mddev
->level
= info
->level
;
5890 mddev
->clevel
[0] = 0;
5891 mddev
->dev_sectors
= 2 * (sector_t
)info
->size
;
5892 mddev
->raid_disks
= info
->raid_disks
;
5893 /* don't set md_minor, it is determined by which /dev/md* was
5896 if (info
->state
& (1<<MD_SB_CLEAN
))
5897 mddev
->recovery_cp
= MaxSector
;
5899 mddev
->recovery_cp
= 0;
5900 mddev
->persistent
= ! info
->not_persistent
;
5901 mddev
->external
= 0;
5903 mddev
->layout
= info
->layout
;
5904 mddev
->chunk_sectors
= info
->chunk_size
>> 9;
5906 mddev
->max_disks
= MD_SB_DISKS
;
5908 if (mddev
->persistent
)
5910 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
5912 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
5913 mddev
->bitmap_info
.default_space
= 64*2 - (MD_SB_BYTES
>> 9);
5914 mddev
->bitmap_info
.offset
= 0;
5916 mddev
->reshape_position
= MaxSector
;
5919 * Generate a 128 bit UUID
5921 get_random_bytes(mddev
->uuid
, 16);
5923 mddev
->new_level
= mddev
->level
;
5924 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
5925 mddev
->new_layout
= mddev
->layout
;
5926 mddev
->delta_disks
= 0;
5927 mddev
->reshape_backwards
= 0;
5932 void md_set_array_sectors(struct mddev
*mddev
, sector_t array_sectors
)
5934 WARN(!mddev_is_locked(mddev
), "%s: unlocked mddev!\n", __func__
);
5936 if (mddev
->external_size
)
5939 mddev
->array_sectors
= array_sectors
;
5941 EXPORT_SYMBOL(md_set_array_sectors
);
5943 static int update_size(struct mddev
*mddev
, sector_t num_sectors
)
5945 struct md_rdev
*rdev
;
5947 int fit
= (num_sectors
== 0);
5949 if (mddev
->pers
->resize
== NULL
)
5951 /* The "num_sectors" is the number of sectors of each device that
5952 * is used. This can only make sense for arrays with redundancy.
5953 * linear and raid0 always use whatever space is available. We can only
5954 * consider changing this number if no resync or reconstruction is
5955 * happening, and if the new size is acceptable. It must fit before the
5956 * sb_start or, if that is <data_offset, it must fit before the size
5957 * of each device. If num_sectors is zero, we find the largest size
5960 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
5966 rdev_for_each(rdev
, mddev
) {
5967 sector_t avail
= rdev
->sectors
;
5969 if (fit
&& (num_sectors
== 0 || num_sectors
> avail
))
5970 num_sectors
= avail
;
5971 if (avail
< num_sectors
)
5974 rv
= mddev
->pers
->resize(mddev
, num_sectors
);
5976 revalidate_disk(mddev
->gendisk
);
5980 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
)
5983 struct md_rdev
*rdev
;
5984 /* change the number of raid disks */
5985 if (mddev
->pers
->check_reshape
== NULL
)
5989 if (raid_disks
<= 0 ||
5990 (mddev
->max_disks
&& raid_disks
>= mddev
->max_disks
))
5992 if (mddev
->sync_thread
||
5993 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
5994 mddev
->reshape_position
!= MaxSector
)
5997 rdev_for_each(rdev
, mddev
) {
5998 if (mddev
->raid_disks
< raid_disks
&&
5999 rdev
->data_offset
< rdev
->new_data_offset
)
6001 if (mddev
->raid_disks
> raid_disks
&&
6002 rdev
->data_offset
> rdev
->new_data_offset
)
6006 mddev
->delta_disks
= raid_disks
- mddev
->raid_disks
;
6007 if (mddev
->delta_disks
< 0)
6008 mddev
->reshape_backwards
= 1;
6009 else if (mddev
->delta_disks
> 0)
6010 mddev
->reshape_backwards
= 0;
6012 rv
= mddev
->pers
->check_reshape(mddev
);
6014 mddev
->delta_disks
= 0;
6015 mddev
->reshape_backwards
= 0;
6021 * update_array_info is used to change the configuration of an
6023 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
6024 * fields in the info are checked against the array.
6025 * Any differences that cannot be handled will cause an error.
6026 * Normally, only one change can be managed at a time.
6028 static int update_array_info(struct mddev
*mddev
, mdu_array_info_t
*info
)
6034 /* calculate expected state,ignoring low bits */
6035 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
6036 state
|= (1 << MD_SB_BITMAP_PRESENT
);
6038 if (mddev
->major_version
!= info
->major_version
||
6039 mddev
->minor_version
!= info
->minor_version
||
6040 /* mddev->patch_version != info->patch_version || */
6041 mddev
->ctime
!= info
->ctime
||
6042 mddev
->level
!= info
->level
||
6043 /* mddev->layout != info->layout || */
6044 !mddev
->persistent
!= info
->not_persistent
||
6045 mddev
->chunk_sectors
!= info
->chunk_size
>> 9 ||
6046 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
6047 ((state
^info
->state
) & 0xfffffe00)
6050 /* Check there is only one change */
6051 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
6053 if (mddev
->raid_disks
!= info
->raid_disks
)
6055 if (mddev
->layout
!= info
->layout
)
6057 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
))
6064 if (mddev
->layout
!= info
->layout
) {
6066 * we don't need to do anything at the md level, the
6067 * personality will take care of it all.
6069 if (mddev
->pers
->check_reshape
== NULL
)
6072 mddev
->new_layout
= info
->layout
;
6073 rv
= mddev
->pers
->check_reshape(mddev
);
6075 mddev
->new_layout
= mddev
->layout
;
6079 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
6080 rv
= update_size(mddev
, (sector_t
)info
->size
* 2);
6082 if (mddev
->raid_disks
!= info
->raid_disks
)
6083 rv
= update_raid_disks(mddev
, info
->raid_disks
);
6085 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) {
6086 if (mddev
->pers
->quiesce
== NULL
|| mddev
->thread
== NULL
)
6088 if (mddev
->recovery
|| mddev
->sync_thread
)
6090 if (info
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
6091 /* add the bitmap */
6094 if (mddev
->bitmap_info
.default_offset
== 0)
6096 mddev
->bitmap_info
.offset
=
6097 mddev
->bitmap_info
.default_offset
;
6098 mddev
->bitmap_info
.space
=
6099 mddev
->bitmap_info
.default_space
;
6100 mddev
->pers
->quiesce(mddev
, 1);
6101 rv
= bitmap_create(mddev
);
6103 rv
= bitmap_load(mddev
);
6105 bitmap_destroy(mddev
);
6106 mddev
->pers
->quiesce(mddev
, 0);
6108 /* remove the bitmap */
6111 if (mddev
->bitmap
->storage
.file
)
6113 mddev
->pers
->quiesce(mddev
, 1);
6114 bitmap_destroy(mddev
);
6115 mddev
->pers
->quiesce(mddev
, 0);
6116 mddev
->bitmap_info
.offset
= 0;
6119 md_update_sb(mddev
, 1);
6123 static int set_disk_faulty(struct mddev
*mddev
, dev_t dev
)
6125 struct md_rdev
*rdev
;
6128 if (mddev
->pers
== NULL
)
6132 rdev
= find_rdev_rcu(mddev
, dev
);
6136 md_error(mddev
, rdev
);
6137 if (!test_bit(Faulty
, &rdev
->flags
))
6145 * We have a problem here : there is no easy way to give a CHS
6146 * virtual geometry. We currently pretend that we have a 2 heads
6147 * 4 sectors (with a BIG number of cylinders...). This drives
6148 * dosfs just mad... ;-)
6150 static int md_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
6152 struct mddev
*mddev
= bdev
->bd_disk
->private_data
;
6156 geo
->cylinders
= mddev
->array_sectors
/ 8;
6160 static inline bool md_ioctl_valid(unsigned int cmd
)
6165 case GET_ARRAY_INFO
:
6166 case GET_BITMAP_FILE
:
6169 case HOT_REMOVE_DISK
:
6172 case RESTART_ARRAY_RW
:
6174 case SET_ARRAY_INFO
:
6175 case SET_BITMAP_FILE
:
6176 case SET_DISK_FAULTY
:
6185 static int md_ioctl(struct block_device
*bdev
, fmode_t mode
,
6186 unsigned int cmd
, unsigned long arg
)
6189 void __user
*argp
= (void __user
*)arg
;
6190 struct mddev
*mddev
= NULL
;
6193 if (!md_ioctl_valid(cmd
))
6198 case GET_ARRAY_INFO
:
6202 if (!capable(CAP_SYS_ADMIN
))
6207 * Commands dealing with the RAID driver but not any
6212 err
= get_version(argp
);
6218 autostart_arrays(arg
);
6225 * Commands creating/starting a new array:
6228 mddev
= bdev
->bd_disk
->private_data
;
6235 /* Some actions do not requires the mutex */
6237 case GET_ARRAY_INFO
:
6238 if (!mddev
->raid_disks
&& !mddev
->external
)
6241 err
= get_array_info(mddev
, argp
);
6245 if (!mddev
->raid_disks
&& !mddev
->external
)
6248 err
= get_disk_info(mddev
, argp
);
6251 case SET_DISK_FAULTY
:
6252 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
6256 if (cmd
== ADD_NEW_DISK
)
6257 /* need to ensure md_delayed_delete() has completed */
6258 flush_workqueue(md_misc_wq
);
6260 if (cmd
== HOT_REMOVE_DISK
)
6261 /* need to ensure recovery thread has run */
6262 wait_event_interruptible_timeout(mddev
->sb_wait
,
6263 !test_bit(MD_RECOVERY_NEEDED
,
6265 msecs_to_jiffies(5000));
6266 if (cmd
== STOP_ARRAY
|| cmd
== STOP_ARRAY_RO
) {
6267 /* Need to flush page cache, and ensure no-one else opens
6270 mutex_lock(&mddev
->open_mutex
);
6271 if (mddev
->pers
&& atomic_read(&mddev
->openers
) > 1) {
6272 mutex_unlock(&mddev
->open_mutex
);
6276 set_bit(MD_STILL_CLOSED
, &mddev
->flags
);
6277 mutex_unlock(&mddev
->open_mutex
);
6278 sync_blockdev(bdev
);
6280 err
= mddev_lock(mddev
);
6283 "md: ioctl lock interrupted, reason %d, cmd %d\n",
6288 if (cmd
== SET_ARRAY_INFO
) {
6289 mdu_array_info_t info
;
6291 memset(&info
, 0, sizeof(info
));
6292 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
6297 err
= update_array_info(mddev
, &info
);
6299 printk(KERN_WARNING
"md: couldn't update"
6300 " array info. %d\n", err
);
6305 if (!list_empty(&mddev
->disks
)) {
6307 "md: array %s already has disks!\n",
6312 if (mddev
->raid_disks
) {
6314 "md: array %s already initialised!\n",
6319 err
= set_array_info(mddev
, &info
);
6321 printk(KERN_WARNING
"md: couldn't set"
6322 " array info. %d\n", err
);
6329 * Commands querying/configuring an existing array:
6331 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
6332 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
6333 if ((!mddev
->raid_disks
&& !mddev
->external
)
6334 && cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
6335 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
6336 && cmd
!= GET_BITMAP_FILE
) {
6342 * Commands even a read-only array can execute:
6345 case GET_BITMAP_FILE
:
6346 err
= get_bitmap_file(mddev
, argp
);
6349 case RESTART_ARRAY_RW
:
6350 err
= restart_array(mddev
);
6354 err
= do_md_stop(mddev
, 0, bdev
);
6358 err
= md_set_readonly(mddev
, bdev
);
6361 case HOT_REMOVE_DISK
:
6362 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
6366 /* We can support ADD_NEW_DISK on read-only arrays
6367 * on if we are re-adding a preexisting device.
6368 * So require mddev->pers and MD_DISK_SYNC.
6371 mdu_disk_info_t info
;
6372 if (copy_from_user(&info
, argp
, sizeof(info
)))
6374 else if (!(info
.state
& (1<<MD_DISK_SYNC
)))
6375 /* Need to clear read-only for this */
6378 err
= add_new_disk(mddev
, &info
);
6384 if (get_user(ro
, (int __user
*)(arg
))) {
6390 /* if the bdev is going readonly the value of mddev->ro
6391 * does not matter, no writes are coming
6396 /* are we are already prepared for writes? */
6400 /* transitioning to readauto need only happen for
6401 * arrays that call md_write_start
6404 err
= restart_array(mddev
);
6407 set_disk_ro(mddev
->gendisk
, 0);
6414 * The remaining ioctls are changing the state of the
6415 * superblock, so we do not allow them on read-only arrays.
6417 if (mddev
->ro
&& mddev
->pers
) {
6418 if (mddev
->ro
== 2) {
6420 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6421 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6422 /* mddev_unlock will wake thread */
6423 /* If a device failed while we were read-only, we
6424 * need to make sure the metadata is updated now.
6426 if (test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
6427 mddev_unlock(mddev
);
6428 wait_event(mddev
->sb_wait
,
6429 !test_bit(MD_CHANGE_DEVS
, &mddev
->flags
) &&
6430 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
6431 mddev_lock_nointr(mddev
);
6442 mdu_disk_info_t info
;
6443 if (copy_from_user(&info
, argp
, sizeof(info
)))
6446 err
= add_new_disk(mddev
, &info
);
6451 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
6455 err
= do_md_run(mddev
);
6458 case SET_BITMAP_FILE
:
6459 err
= set_bitmap_file(mddev
, (int)arg
);
6468 if (mddev
->hold_active
== UNTIL_IOCTL
&&
6470 mddev
->hold_active
= 0;
6471 mddev_unlock(mddev
);
6475 #ifdef CONFIG_COMPAT
6476 static int md_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
6477 unsigned int cmd
, unsigned long arg
)
6480 case HOT_REMOVE_DISK
:
6482 case SET_DISK_FAULTY
:
6483 case SET_BITMAP_FILE
:
6484 /* These take in integer arg, do not convert */
6487 arg
= (unsigned long)compat_ptr(arg
);
6491 return md_ioctl(bdev
, mode
, cmd
, arg
);
6493 #endif /* CONFIG_COMPAT */
6495 static int md_open(struct block_device
*bdev
, fmode_t mode
)
6498 * Succeed if we can lock the mddev, which confirms that
6499 * it isn't being stopped right now.
6501 struct mddev
*mddev
= mddev_find(bdev
->bd_dev
);
6507 if (mddev
->gendisk
!= bdev
->bd_disk
) {
6508 /* we are racing with mddev_put which is discarding this
6512 /* Wait until bdev->bd_disk is definitely gone */
6513 flush_workqueue(md_misc_wq
);
6514 /* Then retry the open from the top */
6515 return -ERESTARTSYS
;
6517 BUG_ON(mddev
!= bdev
->bd_disk
->private_data
);
6519 if ((err
= mutex_lock_interruptible(&mddev
->open_mutex
)))
6523 atomic_inc(&mddev
->openers
);
6524 clear_bit(MD_STILL_CLOSED
, &mddev
->flags
);
6525 mutex_unlock(&mddev
->open_mutex
);
6527 check_disk_change(bdev
);
6532 static void md_release(struct gendisk
*disk
, fmode_t mode
)
6534 struct mddev
*mddev
= disk
->private_data
;
6537 atomic_dec(&mddev
->openers
);
6541 static int md_media_changed(struct gendisk
*disk
)
6543 struct mddev
*mddev
= disk
->private_data
;
6545 return mddev
->changed
;
6548 static int md_revalidate(struct gendisk
*disk
)
6550 struct mddev
*mddev
= disk
->private_data
;
6555 static const struct block_device_operations md_fops
=
6557 .owner
= THIS_MODULE
,
6559 .release
= md_release
,
6561 #ifdef CONFIG_COMPAT
6562 .compat_ioctl
= md_compat_ioctl
,
6564 .getgeo
= md_getgeo
,
6565 .media_changed
= md_media_changed
,
6566 .revalidate_disk
= md_revalidate
,
6569 static int md_thread(void *arg
)
6571 struct md_thread
*thread
= arg
;
6574 * md_thread is a 'system-thread', it's priority should be very
6575 * high. We avoid resource deadlocks individually in each
6576 * raid personality. (RAID5 does preallocation) We also use RR and
6577 * the very same RT priority as kswapd, thus we will never get
6578 * into a priority inversion deadlock.
6580 * we definitely have to have equal or higher priority than
6581 * bdflush, otherwise bdflush will deadlock if there are too
6582 * many dirty RAID5 blocks.
6585 allow_signal(SIGKILL
);
6586 while (!kthread_should_stop()) {
6588 /* We need to wait INTERRUPTIBLE so that
6589 * we don't add to the load-average.
6590 * That means we need to be sure no signals are
6593 if (signal_pending(current
))
6594 flush_signals(current
);
6596 wait_event_interruptible_timeout
6598 test_bit(THREAD_WAKEUP
, &thread
->flags
)
6599 || kthread_should_stop(),
6602 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
6603 if (!kthread_should_stop())
6604 thread
->run(thread
);
6610 void md_wakeup_thread(struct md_thread
*thread
)
6613 pr_debug("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
6614 set_bit(THREAD_WAKEUP
, &thread
->flags
);
6615 wake_up(&thread
->wqueue
);
6618 EXPORT_SYMBOL(md_wakeup_thread
);
6620 struct md_thread
*md_register_thread(void (*run
) (struct md_thread
*),
6621 struct mddev
*mddev
, const char *name
)
6623 struct md_thread
*thread
;
6625 thread
= kzalloc(sizeof(struct md_thread
), GFP_KERNEL
);
6629 init_waitqueue_head(&thread
->wqueue
);
6632 thread
->mddev
= mddev
;
6633 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
6634 thread
->tsk
= kthread_run(md_thread
, thread
,
6636 mdname(thread
->mddev
),
6638 if (IS_ERR(thread
->tsk
)) {
6644 EXPORT_SYMBOL(md_register_thread
);
6646 void md_unregister_thread(struct md_thread
**threadp
)
6648 struct md_thread
*thread
= *threadp
;
6651 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread
->tsk
));
6652 /* Locking ensures that mddev_unlock does not wake_up a
6653 * non-existent thread
6655 spin_lock(&pers_lock
);
6657 spin_unlock(&pers_lock
);
6659 kthread_stop(thread
->tsk
);
6662 EXPORT_SYMBOL(md_unregister_thread
);
6664 void md_error(struct mddev
*mddev
, struct md_rdev
*rdev
)
6666 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
6669 if (!mddev
->pers
|| !mddev
->pers
->error_handler
)
6671 mddev
->pers
->error_handler(mddev
,rdev
);
6672 if (mddev
->degraded
)
6673 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
6674 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
6675 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6676 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6677 md_wakeup_thread(mddev
->thread
);
6678 if (mddev
->event_work
.func
)
6679 queue_work(md_misc_wq
, &mddev
->event_work
);
6680 md_new_event_inintr(mddev
);
6682 EXPORT_SYMBOL(md_error
);
6684 /* seq_file implementation /proc/mdstat */
6686 static void status_unused(struct seq_file
*seq
)
6689 struct md_rdev
*rdev
;
6691 seq_printf(seq
, "unused devices: ");
6693 list_for_each_entry(rdev
, &pending_raid_disks
, same_set
) {
6694 char b
[BDEVNAME_SIZE
];
6696 seq_printf(seq
, "%s ",
6697 bdevname(rdev
->bdev
,b
));
6700 seq_printf(seq
, "<none>");
6702 seq_printf(seq
, "\n");
6705 static void status_resync(struct seq_file
*seq
, struct mddev
*mddev
)
6707 sector_t max_sectors
, resync
, res
;
6708 unsigned long dt
, db
;
6711 unsigned int per_milli
;
6713 if (mddev
->curr_resync
<= 3)
6716 resync
= mddev
->curr_resync
6717 - atomic_read(&mddev
->recovery_active
);
6719 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
6720 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
6721 max_sectors
= mddev
->resync_max_sectors
;
6723 max_sectors
= mddev
->dev_sectors
;
6725 WARN_ON(max_sectors
== 0);
6726 /* Pick 'scale' such that (resync>>scale)*1000 will fit
6727 * in a sector_t, and (max_sectors>>scale) will fit in a
6728 * u32, as those are the requirements for sector_div.
6729 * Thus 'scale' must be at least 10
6732 if (sizeof(sector_t
) > sizeof(unsigned long)) {
6733 while ( max_sectors
/2 > (1ULL<<(scale
+32)))
6736 res
= (resync
>>scale
)*1000;
6737 sector_div(res
, (u32
)((max_sectors
>>scale
)+1));
6741 int i
, x
= per_milli
/50, y
= 20-x
;
6742 seq_printf(seq
, "[");
6743 for (i
= 0; i
< x
; i
++)
6744 seq_printf(seq
, "=");
6745 seq_printf(seq
, ">");
6746 for (i
= 0; i
< y
; i
++)
6747 seq_printf(seq
, ".");
6748 seq_printf(seq
, "] ");
6750 seq_printf(seq
, " %s =%3u.%u%% (%llu/%llu)",
6751 (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)?
6753 (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)?
6755 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
6756 "resync" : "recovery"))),
6757 per_milli
/10, per_milli
% 10,
6758 (unsigned long long) resync
/2,
6759 (unsigned long long) max_sectors
/2);
6762 * dt: time from mark until now
6763 * db: blocks written from mark until now
6764 * rt: remaining time
6766 * rt is a sector_t, so could be 32bit or 64bit.
6767 * So we divide before multiply in case it is 32bit and close
6769 * We scale the divisor (db) by 32 to avoid losing precision
6770 * near the end of resync when the number of remaining sectors
6772 * We then divide rt by 32 after multiplying by db to compensate.
6773 * The '+1' avoids division by zero if db is very small.
6775 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
6777 db
= (mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
))
6778 - mddev
->resync_mark_cnt
;
6780 rt
= max_sectors
- resync
; /* number of remaining sectors */
6781 sector_div(rt
, db
/32+1);
6785 seq_printf(seq
, " finish=%lu.%lumin", (unsigned long)rt
/ 60,
6786 ((unsigned long)rt
% 60)/6);
6788 seq_printf(seq
, " speed=%ldK/sec", db
/2/dt
);
6791 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
6793 struct list_head
*tmp
;
6795 struct mddev
*mddev
;
6803 spin_lock(&all_mddevs_lock
);
6804 list_for_each(tmp
,&all_mddevs
)
6806 mddev
= list_entry(tmp
, struct mddev
, all_mddevs
);
6808 spin_unlock(&all_mddevs_lock
);
6811 spin_unlock(&all_mddevs_lock
);
6813 return (void*)2;/* tail */
6817 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
6819 struct list_head
*tmp
;
6820 struct mddev
*next_mddev
, *mddev
= v
;
6826 spin_lock(&all_mddevs_lock
);
6828 tmp
= all_mddevs
.next
;
6830 tmp
= mddev
->all_mddevs
.next
;
6831 if (tmp
!= &all_mddevs
)
6832 next_mddev
= mddev_get(list_entry(tmp
,struct mddev
,all_mddevs
));
6834 next_mddev
= (void*)2;
6837 spin_unlock(&all_mddevs_lock
);
6845 static void md_seq_stop(struct seq_file
*seq
, void *v
)
6847 struct mddev
*mddev
= v
;
6849 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
6853 static int md_seq_show(struct seq_file
*seq
, void *v
)
6855 struct mddev
*mddev
= v
;
6857 struct md_rdev
*rdev
;
6859 if (v
== (void*)1) {
6860 struct md_personality
*pers
;
6861 seq_printf(seq
, "Personalities : ");
6862 spin_lock(&pers_lock
);
6863 list_for_each_entry(pers
, &pers_list
, list
)
6864 seq_printf(seq
, "[%s] ", pers
->name
);
6866 spin_unlock(&pers_lock
);
6867 seq_printf(seq
, "\n");
6868 seq
->poll_event
= atomic_read(&md_event_count
);
6871 if (v
== (void*)2) {
6876 if (mddev_lock(mddev
) < 0)
6879 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
6880 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
6881 mddev
->pers
? "" : "in");
6884 seq_printf(seq
, " (read-only)");
6886 seq_printf(seq
, " (auto-read-only)");
6887 seq_printf(seq
, " %s", mddev
->pers
->name
);
6891 rdev_for_each(rdev
, mddev
) {
6892 char b
[BDEVNAME_SIZE
];
6893 seq_printf(seq
, " %s[%d]",
6894 bdevname(rdev
->bdev
,b
), rdev
->desc_nr
);
6895 if (test_bit(WriteMostly
, &rdev
->flags
))
6896 seq_printf(seq
, "(W)");
6897 if (test_bit(Faulty
, &rdev
->flags
)) {
6898 seq_printf(seq
, "(F)");
6901 if (rdev
->raid_disk
< 0)
6902 seq_printf(seq
, "(S)"); /* spare */
6903 if (test_bit(Replacement
, &rdev
->flags
))
6904 seq_printf(seq
, "(R)");
6905 sectors
+= rdev
->sectors
;
6908 if (!list_empty(&mddev
->disks
)) {
6910 seq_printf(seq
, "\n %llu blocks",
6911 (unsigned long long)
6912 mddev
->array_sectors
/ 2);
6914 seq_printf(seq
, "\n %llu blocks",
6915 (unsigned long long)sectors
/ 2);
6917 if (mddev
->persistent
) {
6918 if (mddev
->major_version
!= 0 ||
6919 mddev
->minor_version
!= 90) {
6920 seq_printf(seq
," super %d.%d",
6921 mddev
->major_version
,
6922 mddev
->minor_version
);
6924 } else if (mddev
->external
)
6925 seq_printf(seq
, " super external:%s",
6926 mddev
->metadata_type
);
6928 seq_printf(seq
, " super non-persistent");
6931 mddev
->pers
->status(seq
, mddev
);
6932 seq_printf(seq
, "\n ");
6933 if (mddev
->pers
->sync_request
) {
6934 if (mddev
->curr_resync
> 2) {
6935 status_resync(seq
, mddev
);
6936 seq_printf(seq
, "\n ");
6937 } else if (mddev
->curr_resync
>= 1)
6938 seq_printf(seq
, "\tresync=DELAYED\n ");
6939 else if (mddev
->recovery_cp
< MaxSector
)
6940 seq_printf(seq
, "\tresync=PENDING\n ");
6943 seq_printf(seq
, "\n ");
6945 bitmap_status(seq
, mddev
->bitmap
);
6947 seq_printf(seq
, "\n");
6949 mddev_unlock(mddev
);
6954 static const struct seq_operations md_seq_ops
= {
6955 .start
= md_seq_start
,
6956 .next
= md_seq_next
,
6957 .stop
= md_seq_stop
,
6958 .show
= md_seq_show
,
6961 static int md_seq_open(struct inode
*inode
, struct file
*file
)
6963 struct seq_file
*seq
;
6966 error
= seq_open(file
, &md_seq_ops
);
6970 seq
= file
->private_data
;
6971 seq
->poll_event
= atomic_read(&md_event_count
);
6975 static int md_unloading
;
6976 static unsigned int mdstat_poll(struct file
*filp
, poll_table
*wait
)
6978 struct seq_file
*seq
= filp
->private_data
;
6982 return POLLIN
|POLLRDNORM
|POLLERR
|POLLPRI
;
6983 poll_wait(filp
, &md_event_waiters
, wait
);
6985 /* always allow read */
6986 mask
= POLLIN
| POLLRDNORM
;
6988 if (seq
->poll_event
!= atomic_read(&md_event_count
))
6989 mask
|= POLLERR
| POLLPRI
;
6993 static const struct file_operations md_seq_fops
= {
6994 .owner
= THIS_MODULE
,
6995 .open
= md_seq_open
,
6997 .llseek
= seq_lseek
,
6998 .release
= seq_release_private
,
6999 .poll
= mdstat_poll
,
7002 int register_md_personality(struct md_personality
*p
)
7004 printk(KERN_INFO
"md: %s personality registered for level %d\n",
7006 spin_lock(&pers_lock
);
7007 list_add_tail(&p
->list
, &pers_list
);
7008 spin_unlock(&pers_lock
);
7011 EXPORT_SYMBOL(register_md_personality
);
7013 int unregister_md_personality(struct md_personality
*p
)
7015 printk(KERN_INFO
"md: %s personality unregistered\n", p
->name
);
7016 spin_lock(&pers_lock
);
7017 list_del_init(&p
->list
);
7018 spin_unlock(&pers_lock
);
7021 EXPORT_SYMBOL(unregister_md_personality
);
7023 static int is_mddev_idle(struct mddev
*mddev
, int init
)
7025 struct md_rdev
*rdev
;
7031 rdev_for_each_rcu(rdev
, mddev
) {
7032 struct gendisk
*disk
= rdev
->bdev
->bd_contains
->bd_disk
;
7033 curr_events
= (int)part_stat_read(&disk
->part0
, sectors
[0]) +
7034 (int)part_stat_read(&disk
->part0
, sectors
[1]) -
7035 atomic_read(&disk
->sync_io
);
7036 /* sync IO will cause sync_io to increase before the disk_stats
7037 * as sync_io is counted when a request starts, and
7038 * disk_stats is counted when it completes.
7039 * So resync activity will cause curr_events to be smaller than
7040 * when there was no such activity.
7041 * non-sync IO will cause disk_stat to increase without
7042 * increasing sync_io so curr_events will (eventually)
7043 * be larger than it was before. Once it becomes
7044 * substantially larger, the test below will cause
7045 * the array to appear non-idle, and resync will slow
7047 * If there is a lot of outstanding resync activity when
7048 * we set last_event to curr_events, then all that activity
7049 * completing might cause the array to appear non-idle
7050 * and resync will be slowed down even though there might
7051 * not have been non-resync activity. This will only
7052 * happen once though. 'last_events' will soon reflect
7053 * the state where there is little or no outstanding
7054 * resync requests, and further resync activity will
7055 * always make curr_events less than last_events.
7058 if (init
|| curr_events
- rdev
->last_events
> 64) {
7059 rdev
->last_events
= curr_events
;
7067 void md_done_sync(struct mddev
*mddev
, int blocks
, int ok
)
7069 /* another "blocks" (512byte) blocks have been synced */
7070 atomic_sub(blocks
, &mddev
->recovery_active
);
7071 wake_up(&mddev
->recovery_wait
);
7073 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7074 set_bit(MD_RECOVERY_ERROR
, &mddev
->recovery
);
7075 md_wakeup_thread(mddev
->thread
);
7076 // stop recovery, signal do_sync ....
7079 EXPORT_SYMBOL(md_done_sync
);
7081 /* md_write_start(mddev, bi)
7082 * If we need to update some array metadata (e.g. 'active' flag
7083 * in superblock) before writing, schedule a superblock update
7084 * and wait for it to complete.
7086 void md_write_start(struct mddev
*mddev
, struct bio
*bi
)
7089 if (bio_data_dir(bi
) != WRITE
)
7092 BUG_ON(mddev
->ro
== 1);
7093 if (mddev
->ro
== 2) {
7094 /* need to switch to read/write */
7096 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7097 md_wakeup_thread(mddev
->thread
);
7098 md_wakeup_thread(mddev
->sync_thread
);
7101 atomic_inc(&mddev
->writes_pending
);
7102 if (mddev
->safemode
== 1)
7103 mddev
->safemode
= 0;
7104 if (mddev
->in_sync
) {
7105 spin_lock_irq(&mddev
->write_lock
);
7106 if (mddev
->in_sync
) {
7108 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7109 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
7110 md_wakeup_thread(mddev
->thread
);
7113 spin_unlock_irq(&mddev
->write_lock
);
7116 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7117 wait_event(mddev
->sb_wait
,
7118 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
7120 EXPORT_SYMBOL(md_write_start
);
7122 void md_write_end(struct mddev
*mddev
)
7124 if (atomic_dec_and_test(&mddev
->writes_pending
)) {
7125 if (mddev
->safemode
== 2)
7126 md_wakeup_thread(mddev
->thread
);
7127 else if (mddev
->safemode_delay
)
7128 mod_timer(&mddev
->safemode_timer
, jiffies
+ mddev
->safemode_delay
);
7131 EXPORT_SYMBOL(md_write_end
);
7133 /* md_allow_write(mddev)
7134 * Calling this ensures that the array is marked 'active' so that writes
7135 * may proceed without blocking. It is important to call this before
7136 * attempting a GFP_KERNEL allocation while holding the mddev lock.
7137 * Must be called with mddev_lock held.
7139 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
7140 * is dropped, so return -EAGAIN after notifying userspace.
7142 int md_allow_write(struct mddev
*mddev
)
7148 if (!mddev
->pers
->sync_request
)
7151 spin_lock_irq(&mddev
->write_lock
);
7152 if (mddev
->in_sync
) {
7154 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7155 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
7156 if (mddev
->safemode_delay
&&
7157 mddev
->safemode
== 0)
7158 mddev
->safemode
= 1;
7159 spin_unlock_irq(&mddev
->write_lock
);
7160 md_update_sb(mddev
, 0);
7161 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7163 spin_unlock_irq(&mddev
->write_lock
);
7165 if (test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
7170 EXPORT_SYMBOL_GPL(md_allow_write
);
7172 #define SYNC_MARKS 10
7173 #define SYNC_MARK_STEP (3*HZ)
7174 #define UPDATE_FREQUENCY (5*60*HZ)
7175 void md_do_sync(struct md_thread
*thread
)
7177 struct mddev
*mddev
= thread
->mddev
;
7178 struct mddev
*mddev2
;
7179 unsigned int currspeed
= 0,
7181 sector_t max_sectors
,j
, io_sectors
, recovery_done
;
7182 unsigned long mark
[SYNC_MARKS
];
7183 unsigned long update_time
;
7184 sector_t mark_cnt
[SYNC_MARKS
];
7186 struct list_head
*tmp
;
7187 sector_t last_check
;
7189 struct md_rdev
*rdev
;
7190 char *desc
, *action
= NULL
;
7191 struct blk_plug plug
;
7193 /* just incase thread restarts... */
7194 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
7196 if (mddev
->ro
) {/* never try to sync a read-only array */
7197 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7201 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7202 if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)) {
7203 desc
= "data-check";
7205 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
7206 desc
= "requested-resync";
7210 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
7215 mddev
->last_sync_action
= action
?: desc
;
7217 /* we overload curr_resync somewhat here.
7218 * 0 == not engaged in resync at all
7219 * 2 == checking that there is no conflict with another sync
7220 * 1 == like 2, but have yielded to allow conflicting resync to
7222 * other == active in resync - this many blocks
7224 * Before starting a resync we must have set curr_resync to
7225 * 2, and then checked that every "conflicting" array has curr_resync
7226 * less than ours. When we find one that is the same or higher
7227 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
7228 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
7229 * This will mean we have to start checking from the beginning again.
7234 mddev
->curr_resync
= 2;
7237 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7239 for_each_mddev(mddev2
, tmp
) {
7240 if (mddev2
== mddev
)
7242 if (!mddev
->parallel_resync
7243 && mddev2
->curr_resync
7244 && match_mddev_units(mddev
, mddev2
)) {
7246 if (mddev
< mddev2
&& mddev
->curr_resync
== 2) {
7247 /* arbitrarily yield */
7248 mddev
->curr_resync
= 1;
7249 wake_up(&resync_wait
);
7251 if (mddev
> mddev2
&& mddev
->curr_resync
== 1)
7252 /* no need to wait here, we can wait the next
7253 * time 'round when curr_resync == 2
7256 /* We need to wait 'interruptible' so as not to
7257 * contribute to the load average, and not to
7258 * be caught by 'softlockup'
7260 prepare_to_wait(&resync_wait
, &wq
, TASK_INTERRUPTIBLE
);
7261 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
7262 mddev2
->curr_resync
>= mddev
->curr_resync
) {
7263 printk(KERN_INFO
"md: delaying %s of %s"
7264 " until %s has finished (they"
7265 " share one or more physical units)\n",
7266 desc
, mdname(mddev
), mdname(mddev2
));
7268 if (signal_pending(current
))
7269 flush_signals(current
);
7271 finish_wait(&resync_wait
, &wq
);
7274 finish_wait(&resync_wait
, &wq
);
7277 } while (mddev
->curr_resync
< 2);
7280 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7281 /* resync follows the size requested by the personality,
7282 * which defaults to physical size, but can be virtual size
7284 max_sectors
= mddev
->resync_max_sectors
;
7285 atomic64_set(&mddev
->resync_mismatches
, 0);
7286 /* we don't use the checkpoint if there's a bitmap */
7287 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7288 j
= mddev
->resync_min
;
7289 else if (!mddev
->bitmap
)
7290 j
= mddev
->recovery_cp
;
7292 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
7293 max_sectors
= mddev
->resync_max_sectors
;
7295 /* recovery follows the physical size of devices */
7296 max_sectors
= mddev
->dev_sectors
;
7299 rdev_for_each_rcu(rdev
, mddev
)
7300 if (rdev
->raid_disk
>= 0 &&
7301 !test_bit(Faulty
, &rdev
->flags
) &&
7302 !test_bit(In_sync
, &rdev
->flags
) &&
7303 rdev
->recovery_offset
< j
)
7304 j
= rdev
->recovery_offset
;
7307 /* If there is a bitmap, we need to make sure all
7308 * writes that started before we added a spare
7309 * complete before we start doing a recovery.
7310 * Otherwise the write might complete and (via
7311 * bitmap_endwrite) set a bit in the bitmap after the
7312 * recovery has checked that bit and skipped that
7315 if (mddev
->bitmap
) {
7316 mddev
->pers
->quiesce(mddev
, 1);
7317 mddev
->pers
->quiesce(mddev
, 0);
7321 printk(KERN_INFO
"md: %s of RAID array %s\n", desc
, mdname(mddev
));
7322 printk(KERN_INFO
"md: minimum _guaranteed_ speed:"
7323 " %d KB/sec/disk.\n", speed_min(mddev
));
7324 printk(KERN_INFO
"md: using maximum available idle IO bandwidth "
7325 "(but not more than %d KB/sec) for %s.\n",
7326 speed_max(mddev
), desc
);
7328 is_mddev_idle(mddev
, 1); /* this initializes IO event counters */
7331 for (m
= 0; m
< SYNC_MARKS
; m
++) {
7333 mark_cnt
[m
] = io_sectors
;
7336 mddev
->resync_mark
= mark
[last_mark
];
7337 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
7340 * Tune reconstruction:
7342 window
= 32*(PAGE_SIZE
/512);
7343 printk(KERN_INFO
"md: using %dk window, over a total of %lluk.\n",
7344 window
/2, (unsigned long long)max_sectors
/2);
7346 atomic_set(&mddev
->recovery_active
, 0);
7351 "md: resuming %s of %s from checkpoint.\n",
7352 desc
, mdname(mddev
));
7353 mddev
->curr_resync
= j
;
7355 mddev
->curr_resync
= 3; /* no longer delayed */
7356 mddev
->curr_resync_completed
= j
;
7357 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
7358 md_new_event(mddev
);
7359 update_time
= jiffies
;
7361 blk_start_plug(&plug
);
7362 while (j
< max_sectors
) {
7367 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
7368 ((mddev
->curr_resync
> mddev
->curr_resync_completed
&&
7369 (mddev
->curr_resync
- mddev
->curr_resync_completed
)
7370 > (max_sectors
>> 4)) ||
7371 time_after_eq(jiffies
, update_time
+ UPDATE_FREQUENCY
) ||
7372 (j
- mddev
->curr_resync_completed
)*2
7373 >= mddev
->resync_max
- mddev
->curr_resync_completed
7375 /* time to update curr_resync_completed */
7376 wait_event(mddev
->recovery_wait
,
7377 atomic_read(&mddev
->recovery_active
) == 0);
7378 mddev
->curr_resync_completed
= j
;
7379 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) &&
7380 j
> mddev
->recovery_cp
)
7381 mddev
->recovery_cp
= j
;
7382 update_time
= jiffies
;
7383 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7384 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
7387 while (j
>= mddev
->resync_max
&&
7388 !test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
7389 /* As this condition is controlled by user-space,
7390 * we can block indefinitely, so use '_interruptible'
7391 * to avoid triggering warnings.
7393 flush_signals(current
); /* just in case */
7394 wait_event_interruptible(mddev
->recovery_wait
,
7395 mddev
->resync_max
> j
7396 || test_bit(MD_RECOVERY_INTR
,
7400 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7403 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
,
7404 currspeed
< speed_min(mddev
));
7406 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7410 if (!skipped
) { /* actual IO requested */
7411 io_sectors
+= sectors
;
7412 atomic_add(sectors
, &mddev
->recovery_active
);
7415 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7420 mddev
->curr_resync
= j
;
7421 mddev
->curr_mark_cnt
= io_sectors
;
7422 if (last_check
== 0)
7423 /* this is the earliest that rebuild will be
7424 * visible in /proc/mdstat
7426 md_new_event(mddev
);
7428 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
7431 last_check
= io_sectors
;
7433 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
7435 int next
= (last_mark
+1) % SYNC_MARKS
;
7437 mddev
->resync_mark
= mark
[next
];
7438 mddev
->resync_mark_cnt
= mark_cnt
[next
];
7439 mark
[next
] = jiffies
;
7440 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
7444 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7448 * this loop exits only if either when we are slower than
7449 * the 'hard' speed limit, or the system was IO-idle for
7451 * the system might be non-idle CPU-wise, but we only care
7452 * about not overloading the IO subsystem. (things like an
7453 * e2fsck being done on the RAID array should execute fast)
7457 recovery_done
= io_sectors
- atomic_read(&mddev
->recovery_active
);
7458 currspeed
= ((unsigned long)(recovery_done
- mddev
->resync_mark_cnt
))/2
7459 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
7461 if (currspeed
> speed_min(mddev
)) {
7462 if ((currspeed
> speed_max(mddev
)) ||
7463 !is_mddev_idle(mddev
, 0)) {
7469 printk(KERN_INFO
"md: %s: %s %s.\n",mdname(mddev
), desc
,
7470 test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)
7471 ? "interrupted" : "done");
7473 * this also signals 'finished resyncing' to md_stop
7475 blk_finish_plug(&plug
);
7476 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
7478 /* tell personality that we are finished */
7479 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
, 1);
7481 if (!test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
) &&
7482 mddev
->curr_resync
> 2) {
7483 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7484 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
7485 if (mddev
->curr_resync
>= mddev
->recovery_cp
) {
7487 "md: checkpointing %s of %s.\n",
7488 desc
, mdname(mddev
));
7489 if (test_bit(MD_RECOVERY_ERROR
,
7491 mddev
->recovery_cp
=
7492 mddev
->curr_resync_completed
;
7494 mddev
->recovery_cp
=
7498 mddev
->recovery_cp
= MaxSector
;
7500 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7501 mddev
->curr_resync
= MaxSector
;
7503 rdev_for_each_rcu(rdev
, mddev
)
7504 if (rdev
->raid_disk
>= 0 &&
7505 mddev
->delta_disks
>= 0 &&
7506 !test_bit(Faulty
, &rdev
->flags
) &&
7507 !test_bit(In_sync
, &rdev
->flags
) &&
7508 rdev
->recovery_offset
< mddev
->curr_resync
)
7509 rdev
->recovery_offset
= mddev
->curr_resync
;
7514 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7516 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
7517 /* We completed so min/max setting can be forgotten if used. */
7518 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7519 mddev
->resync_min
= 0;
7520 mddev
->resync_max
= MaxSector
;
7521 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7522 mddev
->resync_min
= mddev
->curr_resync_completed
;
7523 mddev
->curr_resync
= 0;
7524 wake_up(&resync_wait
);
7525 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
7526 md_wakeup_thread(mddev
->thread
);
7529 EXPORT_SYMBOL_GPL(md_do_sync
);
7531 static int remove_and_add_spares(struct mddev
*mddev
,
7532 struct md_rdev
*this)
7534 struct md_rdev
*rdev
;
7538 rdev_for_each(rdev
, mddev
)
7539 if ((this == NULL
|| rdev
== this) &&
7540 rdev
->raid_disk
>= 0 &&
7541 !test_bit(Blocked
, &rdev
->flags
) &&
7542 (test_bit(Faulty
, &rdev
->flags
) ||
7543 ! test_bit(In_sync
, &rdev
->flags
)) &&
7544 atomic_read(&rdev
->nr_pending
)==0) {
7545 if (mddev
->pers
->hot_remove_disk(
7546 mddev
, rdev
) == 0) {
7547 sysfs_unlink_rdev(mddev
, rdev
);
7548 rdev
->raid_disk
= -1;
7552 if (removed
&& mddev
->kobj
.sd
)
7553 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
7558 rdev_for_each(rdev
, mddev
) {
7559 if (rdev
->raid_disk
>= 0 &&
7560 !test_bit(In_sync
, &rdev
->flags
) &&
7561 !test_bit(Faulty
, &rdev
->flags
))
7563 if (rdev
->raid_disk
>= 0)
7565 if (test_bit(Faulty
, &rdev
->flags
))
7568 ! (rdev
->saved_raid_disk
>= 0 &&
7569 !test_bit(Bitmap_sync
, &rdev
->flags
)))
7572 if (rdev
->saved_raid_disk
< 0)
7573 rdev
->recovery_offset
= 0;
7575 hot_add_disk(mddev
, rdev
) == 0) {
7576 if (sysfs_link_rdev(mddev
, rdev
))
7577 /* failure here is OK */;
7579 md_new_event(mddev
);
7580 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7585 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7589 static void md_start_sync(struct work_struct
*ws
)
7591 struct mddev
*mddev
= container_of(ws
, struct mddev
, del_work
);
7593 mddev
->sync_thread
= md_register_thread(md_do_sync
,
7596 if (!mddev
->sync_thread
) {
7597 printk(KERN_ERR
"%s: could not start resync"
7600 /* leave the spares where they are, it shouldn't hurt */
7601 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7602 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
7603 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
7604 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
7605 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7606 wake_up(&resync_wait
);
7607 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
7609 if (mddev
->sysfs_action
)
7610 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7612 md_wakeup_thread(mddev
->sync_thread
);
7613 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7614 md_new_event(mddev
);
7618 * This routine is regularly called by all per-raid-array threads to
7619 * deal with generic issues like resync and super-block update.
7620 * Raid personalities that don't have a thread (linear/raid0) do not
7621 * need this as they never do any recovery or update the superblock.
7623 * It does not do any resync itself, but rather "forks" off other threads
7624 * to do that as needed.
7625 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
7626 * "->recovery" and create a thread at ->sync_thread.
7627 * When the thread finishes it sets MD_RECOVERY_DONE
7628 * and wakeups up this thread which will reap the thread and finish up.
7629 * This thread also removes any faulty devices (with nr_pending == 0).
7631 * The overall approach is:
7632 * 1/ if the superblock needs updating, update it.
7633 * 2/ If a recovery thread is running, don't do anything else.
7634 * 3/ If recovery has finished, clean up, possibly marking spares active.
7635 * 4/ If there are any faulty devices, remove them.
7636 * 5/ If array is degraded, try to add spares devices
7637 * 6/ If array has spares or is not in-sync, start a resync thread.
7639 void md_check_recovery(struct mddev
*mddev
)
7641 if (mddev
->suspended
)
7645 bitmap_daemon_work(mddev
);
7647 if (signal_pending(current
)) {
7648 if (mddev
->pers
->sync_request
&& !mddev
->external
) {
7649 printk(KERN_INFO
"md: %s in immediate safe mode\n",
7651 mddev
->safemode
= 2;
7653 flush_signals(current
);
7656 if (mddev
->ro
&& !test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
7659 (mddev
->flags
& MD_UPDATE_SB_FLAGS
& ~ (1<<MD_CHANGE_PENDING
)) ||
7660 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
7661 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
7662 (mddev
->external
== 0 && mddev
->safemode
== 1) ||
7663 (mddev
->safemode
== 2 && ! atomic_read(&mddev
->writes_pending
)
7664 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
7668 if (mddev_trylock(mddev
)) {
7672 /* On a read-only array we can:
7673 * - remove failed devices
7674 * - add already-in_sync devices if the array itself
7676 * As we only add devices that are already in-sync,
7677 * we can activate the spares immediately.
7679 remove_and_add_spares(mddev
, NULL
);
7680 /* There is no thread, but we need to call
7681 * ->spare_active and clear saved_raid_disk
7683 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7684 md_reap_sync_thread(mddev
);
7685 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7689 if (!mddev
->external
) {
7691 spin_lock_irq(&mddev
->write_lock
);
7692 if (mddev
->safemode
&&
7693 !atomic_read(&mddev
->writes_pending
) &&
7695 mddev
->recovery_cp
== MaxSector
) {
7698 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7700 if (mddev
->safemode
== 1)
7701 mddev
->safemode
= 0;
7702 spin_unlock_irq(&mddev
->write_lock
);
7704 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7707 if (mddev
->flags
& MD_UPDATE_SB_FLAGS
)
7708 md_update_sb(mddev
, 0);
7710 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
7711 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
7712 /* resync/recovery still happening */
7713 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7716 if (mddev
->sync_thread
) {
7717 md_reap_sync_thread(mddev
);
7720 /* Set RUNNING before clearing NEEDED to avoid
7721 * any transients in the value of "sync_action".
7723 mddev
->curr_resync_completed
= 0;
7724 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7725 /* Clear some bits that don't mean anything, but
7728 clear_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7729 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
7731 if (!test_and_clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
7732 test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
7734 /* no recovery is running.
7735 * remove any failed drives, then
7736 * add spares if possible.
7737 * Spares are also removed and re-added, to allow
7738 * the personality to fail the re-add.
7741 if (mddev
->reshape_position
!= MaxSector
) {
7742 if (mddev
->pers
->check_reshape
== NULL
||
7743 mddev
->pers
->check_reshape(mddev
) != 0)
7744 /* Cannot proceed */
7746 set_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
7747 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7748 } else if ((spares
= remove_and_add_spares(mddev
, NULL
))) {
7749 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7750 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
7751 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
7752 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7753 } else if (mddev
->recovery_cp
< MaxSector
) {
7754 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7755 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7756 } else if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
7757 /* nothing to be done ... */
7760 if (mddev
->pers
->sync_request
) {
7762 /* We are adding a device or devices to an array
7763 * which has the bitmap stored on all devices.
7764 * So make sure all bitmap pages get written
7766 bitmap_write_all(mddev
->bitmap
);
7768 INIT_WORK(&mddev
->del_work
, md_start_sync
);
7769 queue_work(md_misc_wq
, &mddev
->del_work
);
7773 if (!mddev
->sync_thread
) {
7774 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7775 wake_up(&resync_wait
);
7776 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
7778 if (mddev
->sysfs_action
)
7779 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7782 wake_up(&mddev
->sb_wait
);
7783 mddev_unlock(mddev
);
7786 EXPORT_SYMBOL(md_check_recovery
);
7788 void md_reap_sync_thread(struct mddev
*mddev
)
7790 struct md_rdev
*rdev
;
7792 /* resync has finished, collect result */
7793 md_unregister_thread(&mddev
->sync_thread
);
7794 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
7795 !test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
7797 /* activate any spares */
7798 if (mddev
->pers
->spare_active(mddev
)) {
7799 sysfs_notify(&mddev
->kobj
, NULL
,
7801 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7804 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
7805 mddev
->pers
->finish_reshape
)
7806 mddev
->pers
->finish_reshape(mddev
);
7808 /* If array is no-longer degraded, then any saved_raid_disk
7809 * information must be scrapped.
7811 if (!mddev
->degraded
)
7812 rdev_for_each(rdev
, mddev
)
7813 rdev
->saved_raid_disk
= -1;
7815 md_update_sb(mddev
, 1);
7816 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7817 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7818 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
7819 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
7820 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
7821 wake_up(&resync_wait
);
7822 /* flag recovery needed just to double check */
7823 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7824 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7825 md_new_event(mddev
);
7826 if (mddev
->event_work
.func
)
7827 queue_work(md_misc_wq
, &mddev
->event_work
);
7829 EXPORT_SYMBOL(md_reap_sync_thread
);
7831 void md_wait_for_blocked_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
7833 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
7834 wait_event_timeout(rdev
->blocked_wait
,
7835 !test_bit(Blocked
, &rdev
->flags
) &&
7836 !test_bit(BlockedBadBlocks
, &rdev
->flags
),
7837 msecs_to_jiffies(5000));
7838 rdev_dec_pending(rdev
, mddev
);
7840 EXPORT_SYMBOL(md_wait_for_blocked_rdev
);
7842 void md_finish_reshape(struct mddev
*mddev
)
7844 /* called be personality module when reshape completes. */
7845 struct md_rdev
*rdev
;
7847 rdev_for_each(rdev
, mddev
) {
7848 if (rdev
->data_offset
> rdev
->new_data_offset
)
7849 rdev
->sectors
+= rdev
->data_offset
- rdev
->new_data_offset
;
7851 rdev
->sectors
-= rdev
->new_data_offset
- rdev
->data_offset
;
7852 rdev
->data_offset
= rdev
->new_data_offset
;
7855 EXPORT_SYMBOL(md_finish_reshape
);
7857 /* Bad block management.
7858 * We can record which blocks on each device are 'bad' and so just
7859 * fail those blocks, or that stripe, rather than the whole device.
7860 * Entries in the bad-block table are 64bits wide. This comprises:
7861 * Length of bad-range, in sectors: 0-511 for lengths 1-512
7862 * Start of bad-range, sector offset, 54 bits (allows 8 exbibytes)
7863 * A 'shift' can be set so that larger blocks are tracked and
7864 * consequently larger devices can be covered.
7865 * 'Acknowledged' flag - 1 bit. - the most significant bit.
7867 * Locking of the bad-block table uses a seqlock so md_is_badblock
7868 * might need to retry if it is very unlucky.
7869 * We will sometimes want to check for bad blocks in a bi_end_io function,
7870 * so we use the write_seqlock_irq variant.
7872 * When looking for a bad block we specify a range and want to
7873 * know if any block in the range is bad. So we binary-search
7874 * to the last range that starts at-or-before the given endpoint,
7875 * (or "before the sector after the target range")
7876 * then see if it ends after the given start.
7878 * 0 if there are no known bad blocks in the range
7879 * 1 if there are known bad block which are all acknowledged
7880 * -1 if there are bad blocks which have not yet been acknowledged in metadata.
7881 * plus the start/length of the first bad section we overlap.
7883 int md_is_badblock(struct badblocks
*bb
, sector_t s
, int sectors
,
7884 sector_t
*first_bad
, int *bad_sectors
)
7890 sector_t target
= s
+ sectors
;
7893 if (bb
->shift
> 0) {
7894 /* round the start down, and the end up */
7896 target
+= (1<<bb
->shift
) - 1;
7897 target
>>= bb
->shift
;
7898 sectors
= target
- s
;
7900 /* 'target' is now the first block after the bad range */
7903 seq
= read_seqbegin(&bb
->lock
);
7908 /* Binary search between lo and hi for 'target'
7909 * i.e. for the last range that starts before 'target'
7911 /* INVARIANT: ranges before 'lo' and at-or-after 'hi'
7912 * are known not to be the last range before target.
7913 * VARIANT: hi-lo is the number of possible
7914 * ranges, and decreases until it reaches 1
7916 while (hi
- lo
> 1) {
7917 int mid
= (lo
+ hi
) / 2;
7918 sector_t a
= BB_OFFSET(p
[mid
]);
7920 /* This could still be the one, earlier ranges
7924 /* This and later ranges are definitely out. */
7927 /* 'lo' might be the last that started before target, but 'hi' isn't */
7929 /* need to check all range that end after 's' to see if
7930 * any are unacknowledged.
7933 BB_OFFSET(p
[lo
]) + BB_LEN(p
[lo
]) > s
) {
7934 if (BB_OFFSET(p
[lo
]) < target
) {
7935 /* starts before the end, and finishes after
7936 * the start, so they must overlap
7938 if (rv
!= -1 && BB_ACK(p
[lo
]))
7942 *first_bad
= BB_OFFSET(p
[lo
]);
7943 *bad_sectors
= BB_LEN(p
[lo
]);
7949 if (read_seqretry(&bb
->lock
, seq
))
7954 EXPORT_SYMBOL_GPL(md_is_badblock
);
7957 * Add a range of bad blocks to the table.
7958 * This might extend the table, or might contract it
7959 * if two adjacent ranges can be merged.
7960 * We binary-search to find the 'insertion' point, then
7961 * decide how best to handle it.
7963 static int md_set_badblocks(struct badblocks
*bb
, sector_t s
, int sectors
,
7969 unsigned long flags
;
7972 /* badblocks are disabled */
7976 /* round the start down, and the end up */
7977 sector_t next
= s
+ sectors
;
7979 next
+= (1<<bb
->shift
) - 1;
7984 write_seqlock_irqsave(&bb
->lock
, flags
);
7989 /* Find the last range that starts at-or-before 's' */
7990 while (hi
- lo
> 1) {
7991 int mid
= (lo
+ hi
) / 2;
7992 sector_t a
= BB_OFFSET(p
[mid
]);
7998 if (hi
> lo
&& BB_OFFSET(p
[lo
]) > s
)
8002 /* we found a range that might merge with the start
8005 sector_t a
= BB_OFFSET(p
[lo
]);
8006 sector_t e
= a
+ BB_LEN(p
[lo
]);
8007 int ack
= BB_ACK(p
[lo
]);
8009 /* Yes, we can merge with a previous range */
8010 if (s
== a
&& s
+ sectors
>= e
)
8011 /* new range covers old */
8014 ack
= ack
&& acknowledged
;
8016 if (e
< s
+ sectors
)
8018 if (e
- a
<= BB_MAX_LEN
) {
8019 p
[lo
] = BB_MAKE(a
, e
-a
, ack
);
8022 /* does not all fit in one range,
8023 * make p[lo] maximal
8025 if (BB_LEN(p
[lo
]) != BB_MAX_LEN
)
8026 p
[lo
] = BB_MAKE(a
, BB_MAX_LEN
, ack
);
8032 if (sectors
&& hi
< bb
->count
) {
8033 /* 'hi' points to the first range that starts after 's'.
8034 * Maybe we can merge with the start of that range */
8035 sector_t a
= BB_OFFSET(p
[hi
]);
8036 sector_t e
= a
+ BB_LEN(p
[hi
]);
8037 int ack
= BB_ACK(p
[hi
]);
8038 if (a
<= s
+ sectors
) {
8039 /* merging is possible */
8040 if (e
<= s
+ sectors
) {
8045 ack
= ack
&& acknowledged
;
8048 if (e
- a
<= BB_MAX_LEN
) {
8049 p
[hi
] = BB_MAKE(a
, e
-a
, ack
);
8052 p
[hi
] = BB_MAKE(a
, BB_MAX_LEN
, ack
);
8060 if (sectors
== 0 && hi
< bb
->count
) {
8061 /* we might be able to combine lo and hi */
8062 /* Note: 's' is at the end of 'lo' */
8063 sector_t a
= BB_OFFSET(p
[hi
]);
8064 int lolen
= BB_LEN(p
[lo
]);
8065 int hilen
= BB_LEN(p
[hi
]);
8066 int newlen
= lolen
+ hilen
- (s
- a
);
8067 if (s
>= a
&& newlen
< BB_MAX_LEN
) {
8068 /* yes, we can combine them */
8069 int ack
= BB_ACK(p
[lo
]) && BB_ACK(p
[hi
]);
8070 p
[lo
] = BB_MAKE(BB_OFFSET(p
[lo
]), newlen
, ack
);
8071 memmove(p
+ hi
, p
+ hi
+ 1,
8072 (bb
->count
- hi
- 1) * 8);
8077 /* didn't merge (it all).
8078 * Need to add a range just before 'hi' */
8079 if (bb
->count
>= MD_MAX_BADBLOCKS
) {
8080 /* No room for more */
8084 int this_sectors
= sectors
;
8085 memmove(p
+ hi
+ 1, p
+ hi
,
8086 (bb
->count
- hi
) * 8);
8089 if (this_sectors
> BB_MAX_LEN
)
8090 this_sectors
= BB_MAX_LEN
;
8091 p
[hi
] = BB_MAKE(s
, this_sectors
, acknowledged
);
8092 sectors
-= this_sectors
;
8099 bb
->unacked_exist
= 1;
8100 write_sequnlock_irqrestore(&bb
->lock
, flags
);
8105 int rdev_set_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
8110 s
+= rdev
->new_data_offset
;
8112 s
+= rdev
->data_offset
;
8113 rv
= md_set_badblocks(&rdev
->badblocks
,
8116 /* Make sure they get written out promptly */
8117 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
8118 set_bit(MD_CHANGE_CLEAN
, &rdev
->mddev
->flags
);
8119 md_wakeup_thread(rdev
->mddev
->thread
);
8123 EXPORT_SYMBOL_GPL(rdev_set_badblocks
);
8126 * Remove a range of bad blocks from the table.
8127 * This may involve extending the table if we spilt a region,
8128 * but it must not fail. So if the table becomes full, we just
8129 * drop the remove request.
8131 static int md_clear_badblocks(struct badblocks
*bb
, sector_t s
, int sectors
)
8135 sector_t target
= s
+ sectors
;
8138 if (bb
->shift
> 0) {
8139 /* When clearing we round the start up and the end down.
8140 * This should not matter as the shift should align with
8141 * the block size and no rounding should ever be needed.
8142 * However it is better the think a block is bad when it
8143 * isn't than to think a block is not bad when it is.
8145 s
+= (1<<bb
->shift
) - 1;
8147 target
>>= bb
->shift
;
8148 sectors
= target
- s
;
8151 write_seqlock_irq(&bb
->lock
);
8156 /* Find the last range that starts before 'target' */
8157 while (hi
- lo
> 1) {
8158 int mid
= (lo
+ hi
) / 2;
8159 sector_t a
= BB_OFFSET(p
[mid
]);
8166 /* p[lo] is the last range that could overlap the
8167 * current range. Earlier ranges could also overlap,
8168 * but only this one can overlap the end of the range.
8170 if (BB_OFFSET(p
[lo
]) + BB_LEN(p
[lo
]) > target
) {
8171 /* Partial overlap, leave the tail of this range */
8172 int ack
= BB_ACK(p
[lo
]);
8173 sector_t a
= BB_OFFSET(p
[lo
]);
8174 sector_t end
= a
+ BB_LEN(p
[lo
]);
8177 /* we need to split this range */
8178 if (bb
->count
>= MD_MAX_BADBLOCKS
) {
8182 memmove(p
+lo
+1, p
+lo
, (bb
->count
- lo
) * 8);
8184 p
[lo
] = BB_MAKE(a
, s
-a
, ack
);
8187 p
[lo
] = BB_MAKE(target
, end
- target
, ack
);
8188 /* there is no longer an overlap */
8193 BB_OFFSET(p
[lo
]) + BB_LEN(p
[lo
]) > s
) {
8194 /* This range does overlap */
8195 if (BB_OFFSET(p
[lo
]) < s
) {
8196 /* Keep the early parts of this range. */
8197 int ack
= BB_ACK(p
[lo
]);
8198 sector_t start
= BB_OFFSET(p
[lo
]);
8199 p
[lo
] = BB_MAKE(start
, s
- start
, ack
);
8200 /* now low doesn't overlap, so.. */
8205 /* 'lo' is strictly before, 'hi' is strictly after,
8206 * anything between needs to be discarded
8209 memmove(p
+lo
+1, p
+hi
, (bb
->count
- hi
) * 8);
8210 bb
->count
-= (hi
- lo
- 1);
8216 write_sequnlock_irq(&bb
->lock
);
8220 int rdev_clear_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
8224 s
+= rdev
->new_data_offset
;
8226 s
+= rdev
->data_offset
;
8227 return md_clear_badblocks(&rdev
->badblocks
,
8230 EXPORT_SYMBOL_GPL(rdev_clear_badblocks
);
8233 * Acknowledge all bad blocks in a list.
8234 * This only succeeds if ->changed is clear. It is used by
8235 * in-kernel metadata updates
8237 void md_ack_all_badblocks(struct badblocks
*bb
)
8239 if (bb
->page
== NULL
|| bb
->changed
)
8240 /* no point even trying */
8242 write_seqlock_irq(&bb
->lock
);
8244 if (bb
->changed
== 0 && bb
->unacked_exist
) {
8247 for (i
= 0; i
< bb
->count
; i
++) {
8248 if (!BB_ACK(p
[i
])) {
8249 sector_t start
= BB_OFFSET(p
[i
]);
8250 int len
= BB_LEN(p
[i
]);
8251 p
[i
] = BB_MAKE(start
, len
, 1);
8254 bb
->unacked_exist
= 0;
8256 write_sequnlock_irq(&bb
->lock
);
8258 EXPORT_SYMBOL_GPL(md_ack_all_badblocks
);
8260 /* sysfs access to bad-blocks list.
8261 * We present two files.
8262 * 'bad-blocks' lists sector numbers and lengths of ranges that
8263 * are recorded as bad. The list is truncated to fit within
8264 * the one-page limit of sysfs.
8265 * Writing "sector length" to this file adds an acknowledged
8267 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
8268 * been acknowledged. Writing to this file adds bad blocks
8269 * without acknowledging them. This is largely for testing.
8273 badblocks_show(struct badblocks
*bb
, char *page
, int unack
)
8284 seq
= read_seqbegin(&bb
->lock
);
8289 while (len
< PAGE_SIZE
&& i
< bb
->count
) {
8290 sector_t s
= BB_OFFSET(p
[i
]);
8291 unsigned int length
= BB_LEN(p
[i
]);
8292 int ack
= BB_ACK(p
[i
]);
8298 len
+= snprintf(page
+len
, PAGE_SIZE
-len
, "%llu %u\n",
8299 (unsigned long long)s
<< bb
->shift
,
8300 length
<< bb
->shift
);
8302 if (unack
&& len
== 0)
8303 bb
->unacked_exist
= 0;
8305 if (read_seqretry(&bb
->lock
, seq
))
8314 badblocks_store(struct badblocks
*bb
, const char *page
, size_t len
, int unack
)
8316 unsigned long long sector
;
8320 /* Allow clearing via sysfs *only* for testing/debugging.
8321 * Normally only a successful write may clear a badblock
8324 if (page
[0] == '-') {
8328 #endif /* DO_DEBUG */
8330 switch (sscanf(page
, "%llu %d%c", §or
, &length
, &newline
)) {
8332 if (newline
!= '\n')
8344 md_clear_badblocks(bb
, sector
, length
);
8347 #endif /* DO_DEBUG */
8348 if (md_set_badblocks(bb
, sector
, length
, !unack
))
8354 static int md_notify_reboot(struct notifier_block
*this,
8355 unsigned long code
, void *x
)
8357 struct list_head
*tmp
;
8358 struct mddev
*mddev
;
8361 for_each_mddev(mddev
, tmp
) {
8362 if (mddev_trylock(mddev
)) {
8364 __md_stop_writes(mddev
);
8365 if (mddev
->persistent
)
8366 mddev
->safemode
= 2;
8367 mddev_unlock(mddev
);
8372 * certain more exotic SCSI devices are known to be
8373 * volatile wrt too early system reboots. While the
8374 * right place to handle this issue is the given
8375 * driver, we do want to have a safe RAID driver ...
8383 static struct notifier_block md_notifier
= {
8384 .notifier_call
= md_notify_reboot
,
8386 .priority
= INT_MAX
, /* before any real devices */
8389 static void md_geninit(void)
8391 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
8393 proc_create("mdstat", S_IRUGO
, NULL
, &md_seq_fops
);
8396 static int __init
md_init(void)
8400 md_wq
= alloc_workqueue("md", WQ_MEM_RECLAIM
, 0);
8404 md_misc_wq
= alloc_workqueue("md_misc", 0, 0);
8408 if ((ret
= register_blkdev(MD_MAJOR
, "md")) < 0)
8411 if ((ret
= register_blkdev(0, "mdp")) < 0)
8415 blk_register_region(MKDEV(MD_MAJOR
, 0), 512, THIS_MODULE
,
8416 md_probe
, NULL
, NULL
);
8417 blk_register_region(MKDEV(mdp_major
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
8418 md_probe
, NULL
, NULL
);
8420 register_reboot_notifier(&md_notifier
);
8421 raid_table_header
= register_sysctl_table(raid_root_table
);
8427 unregister_blkdev(MD_MAJOR
, "md");
8429 destroy_workqueue(md_misc_wq
);
8431 destroy_workqueue(md_wq
);
8439 * Searches all registered partitions for autorun RAID arrays
8443 static LIST_HEAD(all_detected_devices
);
8444 struct detected_devices_node
{
8445 struct list_head list
;
8449 void md_autodetect_dev(dev_t dev
)
8451 struct detected_devices_node
*node_detected_dev
;
8453 node_detected_dev
= kzalloc(sizeof(*node_detected_dev
), GFP_KERNEL
);
8454 if (node_detected_dev
) {
8455 node_detected_dev
->dev
= dev
;
8456 list_add_tail(&node_detected_dev
->list
, &all_detected_devices
);
8458 printk(KERN_CRIT
"md: md_autodetect_dev: kzalloc failed"
8459 ", skipping dev(%d,%d)\n", MAJOR(dev
), MINOR(dev
));
8463 static void autostart_arrays(int part
)
8465 struct md_rdev
*rdev
;
8466 struct detected_devices_node
*node_detected_dev
;
8468 int i_scanned
, i_passed
;
8473 printk(KERN_INFO
"md: Autodetecting RAID arrays.\n");
8475 while (!list_empty(&all_detected_devices
) && i_scanned
< INT_MAX
) {
8477 node_detected_dev
= list_entry(all_detected_devices
.next
,
8478 struct detected_devices_node
, list
);
8479 list_del(&node_detected_dev
->list
);
8480 dev
= node_detected_dev
->dev
;
8481 kfree(node_detected_dev
);
8482 rdev
= md_import_device(dev
,0, 90);
8486 if (test_bit(Faulty
, &rdev
->flags
))
8489 set_bit(AutoDetected
, &rdev
->flags
);
8490 list_add(&rdev
->same_set
, &pending_raid_disks
);
8494 printk(KERN_INFO
"md: Scanned %d and added %d devices.\n",
8495 i_scanned
, i_passed
);
8497 autorun_devices(part
);
8500 #endif /* !MODULE */
8502 static __exit
void md_exit(void)
8504 struct mddev
*mddev
;
8505 struct list_head
*tmp
;
8508 blk_unregister_region(MKDEV(MD_MAJOR
,0), 512);
8509 blk_unregister_region(MKDEV(mdp_major
,0), 1U << MINORBITS
);
8511 unregister_blkdev(MD_MAJOR
,"md");
8512 unregister_blkdev(mdp_major
, "mdp");
8513 unregister_reboot_notifier(&md_notifier
);
8514 unregister_sysctl_table(raid_table_header
);
8516 /* We cannot unload the modules while some process is
8517 * waiting for us in select() or poll() - wake them up
8520 while (waitqueue_active(&md_event_waiters
)) {
8521 /* not safe to leave yet */
8522 wake_up(&md_event_waiters
);
8526 remove_proc_entry("mdstat", NULL
);
8528 for_each_mddev(mddev
, tmp
) {
8529 export_array(mddev
);
8530 mddev
->hold_active
= 0;
8532 destroy_workqueue(md_misc_wq
);
8533 destroy_workqueue(md_wq
);
8536 subsys_initcall(md_init
);
8537 module_exit(md_exit
)
8539 static int get_ro(char *buffer
, struct kernel_param
*kp
)
8541 return sprintf(buffer
, "%d", start_readonly
);
8543 static int set_ro(const char *val
, struct kernel_param
*kp
)
8546 int num
= simple_strtoul(val
, &e
, 10);
8547 if (*val
&& (*e
== '\0' || *e
== '\n')) {
8548 start_readonly
= num
;
8554 module_param_call(start_ro
, set_ro
, get_ro
, NULL
, S_IRUSR
|S_IWUSR
);
8555 module_param(start_dirty_degraded
, int, S_IRUGO
|S_IWUSR
);
8556 module_param_call(new_array
, add_named_array
, NULL
, NULL
, S_IWUSR
);
8558 MODULE_LICENSE("GPL");
8559 MODULE_DESCRIPTION("MD RAID framework");
8561 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);