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 struct md_personality
*pers
= mddev
->pers
;
328 if (mddev
->suspended
)
330 else if (pers
&& pers
->congested
)
331 ret
= pers
->congested(mddev
, bits
);
335 EXPORT_SYMBOL_GPL(mddev_congested
);
336 static int md_congested(void *data
, int bits
)
338 struct mddev
*mddev
= data
;
339 return mddev_congested(mddev
, bits
);
342 static int md_mergeable_bvec(struct request_queue
*q
,
343 struct bvec_merge_data
*bvm
,
344 struct bio_vec
*biovec
)
346 struct mddev
*mddev
= q
->queuedata
;
349 if (mddev
->suspended
) {
350 /* Must always allow one vec */
351 if (bvm
->bi_size
== 0)
352 ret
= biovec
->bv_len
;
356 struct md_personality
*pers
= mddev
->pers
;
357 if (pers
&& pers
->mergeable_bvec
)
358 ret
= pers
->mergeable_bvec(mddev
, bvm
, biovec
);
360 ret
= biovec
->bv_len
;
366 * Generic flush handling for md
369 static void md_end_flush(struct bio
*bio
, int err
)
371 struct md_rdev
*rdev
= bio
->bi_private
;
372 struct mddev
*mddev
= rdev
->mddev
;
374 rdev_dec_pending(rdev
, mddev
);
376 if (atomic_dec_and_test(&mddev
->flush_pending
)) {
377 /* The pre-request flush has finished */
378 queue_work(md_wq
, &mddev
->flush_work
);
383 static void md_submit_flush_data(struct work_struct
*ws
);
385 static void submit_flushes(struct work_struct
*ws
)
387 struct mddev
*mddev
= container_of(ws
, struct mddev
, flush_work
);
388 struct md_rdev
*rdev
;
390 INIT_WORK(&mddev
->flush_work
, md_submit_flush_data
);
391 atomic_set(&mddev
->flush_pending
, 1);
393 rdev_for_each_rcu(rdev
, mddev
)
394 if (rdev
->raid_disk
>= 0 &&
395 !test_bit(Faulty
, &rdev
->flags
)) {
396 /* Take two references, one is dropped
397 * when request finishes, one after
398 * we reclaim rcu_read_lock
401 atomic_inc(&rdev
->nr_pending
);
402 atomic_inc(&rdev
->nr_pending
);
404 bi
= bio_alloc_mddev(GFP_NOIO
, 0, mddev
);
405 bi
->bi_end_io
= md_end_flush
;
406 bi
->bi_private
= rdev
;
407 bi
->bi_bdev
= rdev
->bdev
;
408 atomic_inc(&mddev
->flush_pending
);
409 submit_bio(WRITE_FLUSH
, bi
);
411 rdev_dec_pending(rdev
, mddev
);
414 if (atomic_dec_and_test(&mddev
->flush_pending
))
415 queue_work(md_wq
, &mddev
->flush_work
);
418 static void md_submit_flush_data(struct work_struct
*ws
)
420 struct mddev
*mddev
= container_of(ws
, struct mddev
, flush_work
);
421 struct bio
*bio
= mddev
->flush_bio
;
423 if (bio
->bi_iter
.bi_size
== 0)
424 /* an empty barrier - all done */
427 bio
->bi_rw
&= ~REQ_FLUSH
;
428 mddev
->pers
->make_request(mddev
, bio
);
431 mddev
->flush_bio
= NULL
;
432 wake_up(&mddev
->sb_wait
);
435 void md_flush_request(struct mddev
*mddev
, struct bio
*bio
)
437 spin_lock_irq(&mddev
->lock
);
438 wait_event_lock_irq(mddev
->sb_wait
,
441 mddev
->flush_bio
= bio
;
442 spin_unlock_irq(&mddev
->lock
);
444 INIT_WORK(&mddev
->flush_work
, submit_flushes
);
445 queue_work(md_wq
, &mddev
->flush_work
);
447 EXPORT_SYMBOL(md_flush_request
);
449 void md_unplug(struct blk_plug_cb
*cb
, bool from_schedule
)
451 struct mddev
*mddev
= cb
->data
;
452 md_wakeup_thread(mddev
->thread
);
455 EXPORT_SYMBOL(md_unplug
);
457 static inline struct mddev
*mddev_get(struct mddev
*mddev
)
459 atomic_inc(&mddev
->active
);
463 static void mddev_delayed_delete(struct work_struct
*ws
);
465 static void mddev_put(struct mddev
*mddev
)
467 struct bio_set
*bs
= NULL
;
469 if (!atomic_dec_and_lock(&mddev
->active
, &all_mddevs_lock
))
471 if (!mddev
->raid_disks
&& list_empty(&mddev
->disks
) &&
472 mddev
->ctime
== 0 && !mddev
->hold_active
) {
473 /* Array is not configured at all, and not held active,
475 list_del_init(&mddev
->all_mddevs
);
477 mddev
->bio_set
= NULL
;
478 if (mddev
->gendisk
) {
479 /* We did a probe so need to clean up. Call
480 * queue_work inside the spinlock so that
481 * flush_workqueue() after mddev_find will
482 * succeed in waiting for the work to be done.
484 INIT_WORK(&mddev
->del_work
, mddev_delayed_delete
);
485 queue_work(md_misc_wq
, &mddev
->del_work
);
489 spin_unlock(&all_mddevs_lock
);
494 void mddev_init(struct mddev
*mddev
)
496 mutex_init(&mddev
->open_mutex
);
497 mutex_init(&mddev
->reconfig_mutex
);
498 mutex_init(&mddev
->bitmap_info
.mutex
);
499 INIT_LIST_HEAD(&mddev
->disks
);
500 INIT_LIST_HEAD(&mddev
->all_mddevs
);
501 init_timer(&mddev
->safemode_timer
);
502 atomic_set(&mddev
->active
, 1);
503 atomic_set(&mddev
->openers
, 0);
504 atomic_set(&mddev
->active_io
, 0);
505 spin_lock_init(&mddev
->lock
);
506 atomic_set(&mddev
->flush_pending
, 0);
507 init_waitqueue_head(&mddev
->sb_wait
);
508 init_waitqueue_head(&mddev
->recovery_wait
);
509 mddev
->reshape_position
= MaxSector
;
510 mddev
->reshape_backwards
= 0;
511 mddev
->last_sync_action
= "none";
512 mddev
->resync_min
= 0;
513 mddev
->resync_max
= MaxSector
;
514 mddev
->level
= LEVEL_NONE
;
516 EXPORT_SYMBOL_GPL(mddev_init
);
518 static struct mddev
*mddev_find(dev_t unit
)
520 struct mddev
*mddev
, *new = NULL
;
522 if (unit
&& MAJOR(unit
) != MD_MAJOR
)
523 unit
&= ~((1<<MdpMinorShift
)-1);
526 spin_lock(&all_mddevs_lock
);
529 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
530 if (mddev
->unit
== unit
) {
532 spin_unlock(&all_mddevs_lock
);
538 list_add(&new->all_mddevs
, &all_mddevs
);
539 spin_unlock(&all_mddevs_lock
);
540 new->hold_active
= UNTIL_IOCTL
;
544 /* find an unused unit number */
545 static int next_minor
= 512;
546 int start
= next_minor
;
550 dev
= MKDEV(MD_MAJOR
, next_minor
);
552 if (next_minor
> MINORMASK
)
554 if (next_minor
== start
) {
555 /* Oh dear, all in use. */
556 spin_unlock(&all_mddevs_lock
);
562 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
563 if (mddev
->unit
== dev
) {
569 new->md_minor
= MINOR(dev
);
570 new->hold_active
= UNTIL_STOP
;
571 list_add(&new->all_mddevs
, &all_mddevs
);
572 spin_unlock(&all_mddevs_lock
);
575 spin_unlock(&all_mddevs_lock
);
577 new = kzalloc(sizeof(*new), GFP_KERNEL
);
582 if (MAJOR(unit
) == MD_MAJOR
)
583 new->md_minor
= MINOR(unit
);
585 new->md_minor
= MINOR(unit
) >> MdpMinorShift
;
592 static inline int __must_check
mddev_lock(struct mddev
*mddev
)
594 return mutex_lock_interruptible(&mddev
->reconfig_mutex
);
597 /* Sometimes we need to take the lock in a situation where
598 * failure due to interrupts is not acceptable.
600 static inline void mddev_lock_nointr(struct mddev
*mddev
)
602 mutex_lock(&mddev
->reconfig_mutex
);
605 static inline int mddev_is_locked(struct mddev
*mddev
)
607 return mutex_is_locked(&mddev
->reconfig_mutex
);
610 static inline int mddev_trylock(struct mddev
*mddev
)
612 return mutex_trylock(&mddev
->reconfig_mutex
);
615 static struct attribute_group md_redundancy_group
;
617 static void mddev_unlock(struct mddev
*mddev
)
619 if (mddev
->to_remove
) {
620 /* These cannot be removed under reconfig_mutex as
621 * an access to the files will try to take reconfig_mutex
622 * while holding the file unremovable, which leads to
624 * So hold set sysfs_active while the remove in happeing,
625 * and anything else which might set ->to_remove or my
626 * otherwise change the sysfs namespace will fail with
627 * -EBUSY if sysfs_active is still set.
628 * We set sysfs_active under reconfig_mutex and elsewhere
629 * test it under the same mutex to ensure its correct value
632 struct attribute_group
*to_remove
= mddev
->to_remove
;
633 mddev
->to_remove
= NULL
;
634 mddev
->sysfs_active
= 1;
635 mutex_unlock(&mddev
->reconfig_mutex
);
637 if (mddev
->kobj
.sd
) {
638 if (to_remove
!= &md_redundancy_group
)
639 sysfs_remove_group(&mddev
->kobj
, to_remove
);
640 if (mddev
->pers
== NULL
||
641 mddev
->pers
->sync_request
== NULL
) {
642 sysfs_remove_group(&mddev
->kobj
, &md_redundancy_group
);
643 if (mddev
->sysfs_action
)
644 sysfs_put(mddev
->sysfs_action
);
645 mddev
->sysfs_action
= NULL
;
648 mddev
->sysfs_active
= 0;
650 mutex_unlock(&mddev
->reconfig_mutex
);
652 /* As we've dropped the mutex we need a spinlock to
653 * make sure the thread doesn't disappear
655 spin_lock(&pers_lock
);
656 md_wakeup_thread(mddev
->thread
);
657 spin_unlock(&pers_lock
);
660 static struct md_rdev
*find_rdev_nr_rcu(struct mddev
*mddev
, int nr
)
662 struct md_rdev
*rdev
;
664 rdev_for_each_rcu(rdev
, mddev
)
665 if (rdev
->desc_nr
== nr
)
671 static struct md_rdev
*find_rdev(struct mddev
*mddev
, dev_t dev
)
673 struct md_rdev
*rdev
;
675 rdev_for_each(rdev
, mddev
)
676 if (rdev
->bdev
->bd_dev
== dev
)
682 static struct md_rdev
*find_rdev_rcu(struct mddev
*mddev
, dev_t dev
)
684 struct md_rdev
*rdev
;
686 rdev_for_each_rcu(rdev
, mddev
)
687 if (rdev
->bdev
->bd_dev
== dev
)
693 static struct md_personality
*find_pers(int level
, char *clevel
)
695 struct md_personality
*pers
;
696 list_for_each_entry(pers
, &pers_list
, list
) {
697 if (level
!= LEVEL_NONE
&& pers
->level
== level
)
699 if (strcmp(pers
->name
, clevel
)==0)
705 /* return the offset of the super block in 512byte sectors */
706 static inline sector_t
calc_dev_sboffset(struct md_rdev
*rdev
)
708 sector_t num_sectors
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
709 return MD_NEW_SIZE_SECTORS(num_sectors
);
712 static int alloc_disk_sb(struct md_rdev
*rdev
)
714 rdev
->sb_page
= alloc_page(GFP_KERNEL
);
715 if (!rdev
->sb_page
) {
716 printk(KERN_ALERT
"md: out of memory.\n");
723 void md_rdev_clear(struct md_rdev
*rdev
)
726 put_page(rdev
->sb_page
);
728 rdev
->sb_page
= NULL
;
733 put_page(rdev
->bb_page
);
734 rdev
->bb_page
= NULL
;
736 kfree(rdev
->badblocks
.page
);
737 rdev
->badblocks
.page
= NULL
;
739 EXPORT_SYMBOL_GPL(md_rdev_clear
);
741 static void super_written(struct bio
*bio
, int error
)
743 struct md_rdev
*rdev
= bio
->bi_private
;
744 struct mddev
*mddev
= rdev
->mddev
;
746 if (error
|| !test_bit(BIO_UPTODATE
, &bio
->bi_flags
)) {
747 printk("md: super_written gets error=%d, uptodate=%d\n",
748 error
, test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
749 WARN_ON(test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
750 md_error(mddev
, rdev
);
753 if (atomic_dec_and_test(&mddev
->pending_writes
))
754 wake_up(&mddev
->sb_wait
);
758 void md_super_write(struct mddev
*mddev
, struct md_rdev
*rdev
,
759 sector_t sector
, int size
, struct page
*page
)
761 /* write first size bytes of page to sector of rdev
762 * Increment mddev->pending_writes before returning
763 * and decrement it on completion, waking up sb_wait
764 * if zero is reached.
765 * If an error occurred, call md_error
767 struct bio
*bio
= bio_alloc_mddev(GFP_NOIO
, 1, mddev
);
769 bio
->bi_bdev
= rdev
->meta_bdev
? rdev
->meta_bdev
: rdev
->bdev
;
770 bio
->bi_iter
.bi_sector
= sector
;
771 bio_add_page(bio
, page
, size
, 0);
772 bio
->bi_private
= rdev
;
773 bio
->bi_end_io
= super_written
;
775 atomic_inc(&mddev
->pending_writes
);
776 submit_bio(WRITE_FLUSH_FUA
, bio
);
779 void md_super_wait(struct mddev
*mddev
)
781 /* wait for all superblock writes that were scheduled to complete */
782 wait_event(mddev
->sb_wait
, atomic_read(&mddev
->pending_writes
)==0);
785 int sync_page_io(struct md_rdev
*rdev
, sector_t sector
, int size
,
786 struct page
*page
, int rw
, bool metadata_op
)
788 struct bio
*bio
= bio_alloc_mddev(GFP_NOIO
, 1, rdev
->mddev
);
791 bio
->bi_bdev
= (metadata_op
&& rdev
->meta_bdev
) ?
792 rdev
->meta_bdev
: rdev
->bdev
;
794 bio
->bi_iter
.bi_sector
= sector
+ rdev
->sb_start
;
795 else if (rdev
->mddev
->reshape_position
!= MaxSector
&&
796 (rdev
->mddev
->reshape_backwards
==
797 (sector
>= rdev
->mddev
->reshape_position
)))
798 bio
->bi_iter
.bi_sector
= sector
+ rdev
->new_data_offset
;
800 bio
->bi_iter
.bi_sector
= sector
+ rdev
->data_offset
;
801 bio_add_page(bio
, page
, size
, 0);
802 submit_bio_wait(rw
, bio
);
804 ret
= test_bit(BIO_UPTODATE
, &bio
->bi_flags
);
808 EXPORT_SYMBOL_GPL(sync_page_io
);
810 static int read_disk_sb(struct md_rdev
*rdev
, int size
)
812 char b
[BDEVNAME_SIZE
];
817 if (!sync_page_io(rdev
, 0, size
, rdev
->sb_page
, READ
, true))
823 printk(KERN_WARNING
"md: disabled device %s, could not read superblock.\n",
824 bdevname(rdev
->bdev
,b
));
828 static int uuid_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
830 return sb1
->set_uuid0
== sb2
->set_uuid0
&&
831 sb1
->set_uuid1
== sb2
->set_uuid1
&&
832 sb1
->set_uuid2
== sb2
->set_uuid2
&&
833 sb1
->set_uuid3
== sb2
->set_uuid3
;
836 static int sb_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
839 mdp_super_t
*tmp1
, *tmp2
;
841 tmp1
= kmalloc(sizeof(*tmp1
),GFP_KERNEL
);
842 tmp2
= kmalloc(sizeof(*tmp2
),GFP_KERNEL
);
844 if (!tmp1
|| !tmp2
) {
846 printk(KERN_INFO
"md.c sb_equal(): failed to allocate memory!\n");
854 * nr_disks is not constant
859 ret
= (memcmp(tmp1
, tmp2
, MD_SB_GENERIC_CONSTANT_WORDS
* 4) == 0);
866 static u32
md_csum_fold(u32 csum
)
868 csum
= (csum
& 0xffff) + (csum
>> 16);
869 return (csum
& 0xffff) + (csum
>> 16);
872 static unsigned int calc_sb_csum(mdp_super_t
*sb
)
875 u32
*sb32
= (u32
*)sb
;
877 unsigned int disk_csum
, csum
;
879 disk_csum
= sb
->sb_csum
;
882 for (i
= 0; i
< MD_SB_BYTES
/4 ; i
++)
884 csum
= (newcsum
& 0xffffffff) + (newcsum
>>32);
887 /* This used to use csum_partial, which was wrong for several
888 * reasons including that different results are returned on
889 * different architectures. It isn't critical that we get exactly
890 * the same return value as before (we always csum_fold before
891 * testing, and that removes any differences). However as we
892 * know that csum_partial always returned a 16bit value on
893 * alphas, do a fold to maximise conformity to previous behaviour.
895 sb
->sb_csum
= md_csum_fold(disk_csum
);
897 sb
->sb_csum
= disk_csum
;
903 * Handle superblock details.
904 * We want to be able to handle multiple superblock formats
905 * so we have a common interface to them all, and an array of
906 * different handlers.
907 * We rely on user-space to write the initial superblock, and support
908 * reading and updating of superblocks.
909 * Interface methods are:
910 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version)
911 * loads and validates a superblock on dev.
912 * if refdev != NULL, compare superblocks on both devices
914 * 0 - dev has a superblock that is compatible with refdev
915 * 1 - dev has a superblock that is compatible and newer than refdev
916 * so dev should be used as the refdev in future
917 * -EINVAL superblock incompatible or invalid
918 * -othererror e.g. -EIO
920 * int validate_super(struct mddev *mddev, struct md_rdev *dev)
921 * Verify that dev is acceptable into mddev.
922 * The first time, mddev->raid_disks will be 0, and data from
923 * dev should be merged in. Subsequent calls check that dev
924 * is new enough. Return 0 or -EINVAL
926 * void sync_super(struct mddev *mddev, struct md_rdev *dev)
927 * Update the superblock for rdev with data in mddev
928 * This does not write to disc.
934 struct module
*owner
;
935 int (*load_super
)(struct md_rdev
*rdev
,
936 struct md_rdev
*refdev
,
938 int (*validate_super
)(struct mddev
*mddev
,
939 struct md_rdev
*rdev
);
940 void (*sync_super
)(struct mddev
*mddev
,
941 struct md_rdev
*rdev
);
942 unsigned long long (*rdev_size_change
)(struct md_rdev
*rdev
,
943 sector_t num_sectors
);
944 int (*allow_new_offset
)(struct md_rdev
*rdev
,
945 unsigned long long new_offset
);
949 * Check that the given mddev has no bitmap.
951 * This function is called from the run method of all personalities that do not
952 * support bitmaps. It prints an error message and returns non-zero if mddev
953 * has a bitmap. Otherwise, it returns 0.
956 int md_check_no_bitmap(struct mddev
*mddev
)
958 if (!mddev
->bitmap_info
.file
&& !mddev
->bitmap_info
.offset
)
960 printk(KERN_ERR
"%s: bitmaps are not supported for %s\n",
961 mdname(mddev
), mddev
->pers
->name
);
964 EXPORT_SYMBOL(md_check_no_bitmap
);
967 * load_super for 0.90.0
969 static int super_90_load(struct md_rdev
*rdev
, struct md_rdev
*refdev
, int minor_version
)
971 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
976 * Calculate the position of the superblock (512byte sectors),
977 * it's at the end of the disk.
979 * It also happens to be a multiple of 4Kb.
981 rdev
->sb_start
= calc_dev_sboffset(rdev
);
983 ret
= read_disk_sb(rdev
, MD_SB_BYTES
);
988 bdevname(rdev
->bdev
, b
);
989 sb
= page_address(rdev
->sb_page
);
991 if (sb
->md_magic
!= MD_SB_MAGIC
) {
992 printk(KERN_ERR
"md: invalid raid superblock magic on %s\n",
997 if (sb
->major_version
!= 0 ||
998 sb
->minor_version
< 90 ||
999 sb
->minor_version
> 91) {
1000 printk(KERN_WARNING
"Bad version number %d.%d on %s\n",
1001 sb
->major_version
, sb
->minor_version
,
1006 if (sb
->raid_disks
<= 0)
1009 if (md_csum_fold(calc_sb_csum(sb
)) != md_csum_fold(sb
->sb_csum
)) {
1010 printk(KERN_WARNING
"md: invalid superblock checksum on %s\n",
1015 rdev
->preferred_minor
= sb
->md_minor
;
1016 rdev
->data_offset
= 0;
1017 rdev
->new_data_offset
= 0;
1018 rdev
->sb_size
= MD_SB_BYTES
;
1019 rdev
->badblocks
.shift
= -1;
1021 if (sb
->level
== LEVEL_MULTIPATH
)
1024 rdev
->desc_nr
= sb
->this_disk
.number
;
1030 mdp_super_t
*refsb
= page_address(refdev
->sb_page
);
1031 if (!uuid_equal(refsb
, sb
)) {
1032 printk(KERN_WARNING
"md: %s has different UUID to %s\n",
1033 b
, bdevname(refdev
->bdev
,b2
));
1036 if (!sb_equal(refsb
, sb
)) {
1037 printk(KERN_WARNING
"md: %s has same UUID"
1038 " but different superblock to %s\n",
1039 b
, bdevname(refdev
->bdev
, b2
));
1043 ev2
= md_event(refsb
);
1049 rdev
->sectors
= rdev
->sb_start
;
1050 /* Limit to 4TB as metadata cannot record more than that.
1051 * (not needed for Linear and RAID0 as metadata doesn't
1054 if (rdev
->sectors
>= (2ULL << 32) && sb
->level
>= 1)
1055 rdev
->sectors
= (2ULL << 32) - 2;
1057 if (rdev
->sectors
< ((sector_t
)sb
->size
) * 2 && sb
->level
>= 1)
1058 /* "this cannot possibly happen" ... */
1066 * validate_super for 0.90.0
1068 static int super_90_validate(struct mddev
*mddev
, struct md_rdev
*rdev
)
1071 mdp_super_t
*sb
= page_address(rdev
->sb_page
);
1072 __u64 ev1
= md_event(sb
);
1074 rdev
->raid_disk
= -1;
1075 clear_bit(Faulty
, &rdev
->flags
);
1076 clear_bit(In_sync
, &rdev
->flags
);
1077 clear_bit(Bitmap_sync
, &rdev
->flags
);
1078 clear_bit(WriteMostly
, &rdev
->flags
);
1080 if (mddev
->raid_disks
== 0) {
1081 mddev
->major_version
= 0;
1082 mddev
->minor_version
= sb
->minor_version
;
1083 mddev
->patch_version
= sb
->patch_version
;
1084 mddev
->external
= 0;
1085 mddev
->chunk_sectors
= sb
->chunk_size
>> 9;
1086 mddev
->ctime
= sb
->ctime
;
1087 mddev
->utime
= sb
->utime
;
1088 mddev
->level
= sb
->level
;
1089 mddev
->clevel
[0] = 0;
1090 mddev
->layout
= sb
->layout
;
1091 mddev
->raid_disks
= sb
->raid_disks
;
1092 mddev
->dev_sectors
= ((sector_t
)sb
->size
) * 2;
1093 mddev
->events
= ev1
;
1094 mddev
->bitmap_info
.offset
= 0;
1095 mddev
->bitmap_info
.space
= 0;
1096 /* bitmap can use 60 K after the 4K superblocks */
1097 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
1098 mddev
->bitmap_info
.default_space
= 64*2 - (MD_SB_BYTES
>> 9);
1099 mddev
->reshape_backwards
= 0;
1101 if (mddev
->minor_version
>= 91) {
1102 mddev
->reshape_position
= sb
->reshape_position
;
1103 mddev
->delta_disks
= sb
->delta_disks
;
1104 mddev
->new_level
= sb
->new_level
;
1105 mddev
->new_layout
= sb
->new_layout
;
1106 mddev
->new_chunk_sectors
= sb
->new_chunk
>> 9;
1107 if (mddev
->delta_disks
< 0)
1108 mddev
->reshape_backwards
= 1;
1110 mddev
->reshape_position
= MaxSector
;
1111 mddev
->delta_disks
= 0;
1112 mddev
->new_level
= mddev
->level
;
1113 mddev
->new_layout
= mddev
->layout
;
1114 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1117 if (sb
->state
& (1<<MD_SB_CLEAN
))
1118 mddev
->recovery_cp
= MaxSector
;
1120 if (sb
->events_hi
== sb
->cp_events_hi
&&
1121 sb
->events_lo
== sb
->cp_events_lo
) {
1122 mddev
->recovery_cp
= sb
->recovery_cp
;
1124 mddev
->recovery_cp
= 0;
1127 memcpy(mddev
->uuid
+0, &sb
->set_uuid0
, 4);
1128 memcpy(mddev
->uuid
+4, &sb
->set_uuid1
, 4);
1129 memcpy(mddev
->uuid
+8, &sb
->set_uuid2
, 4);
1130 memcpy(mddev
->uuid
+12,&sb
->set_uuid3
, 4);
1132 mddev
->max_disks
= MD_SB_DISKS
;
1134 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
) &&
1135 mddev
->bitmap_info
.file
== NULL
) {
1136 mddev
->bitmap_info
.offset
=
1137 mddev
->bitmap_info
.default_offset
;
1138 mddev
->bitmap_info
.space
=
1139 mddev
->bitmap_info
.default_space
;
1142 } else if (mddev
->pers
== NULL
) {
1143 /* Insist on good event counter while assembling, except
1144 * for spares (which don't need an event count) */
1146 if (sb
->disks
[rdev
->desc_nr
].state
& (
1147 (1<<MD_DISK_SYNC
) | (1 << MD_DISK_ACTIVE
)))
1148 if (ev1
< mddev
->events
)
1150 } else if (mddev
->bitmap
) {
1151 /* if adding to array with a bitmap, then we can accept an
1152 * older device ... but not too old.
1154 if (ev1
< mddev
->bitmap
->events_cleared
)
1156 if (ev1
< mddev
->events
)
1157 set_bit(Bitmap_sync
, &rdev
->flags
);
1159 if (ev1
< mddev
->events
)
1160 /* just a hot-add of a new device, leave raid_disk at -1 */
1164 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1165 desc
= sb
->disks
+ rdev
->desc_nr
;
1167 if (desc
->state
& (1<<MD_DISK_FAULTY
))
1168 set_bit(Faulty
, &rdev
->flags
);
1169 else if (desc
->state
& (1<<MD_DISK_SYNC
) /* &&
1170 desc->raid_disk < mddev->raid_disks */) {
1171 set_bit(In_sync
, &rdev
->flags
);
1172 rdev
->raid_disk
= desc
->raid_disk
;
1173 rdev
->saved_raid_disk
= desc
->raid_disk
;
1174 } else if (desc
->state
& (1<<MD_DISK_ACTIVE
)) {
1175 /* active but not in sync implies recovery up to
1176 * reshape position. We don't know exactly where
1177 * that is, so set to zero for now */
1178 if (mddev
->minor_version
>= 91) {
1179 rdev
->recovery_offset
= 0;
1180 rdev
->raid_disk
= desc
->raid_disk
;
1183 if (desc
->state
& (1<<MD_DISK_WRITEMOSTLY
))
1184 set_bit(WriteMostly
, &rdev
->flags
);
1185 } else /* MULTIPATH are always insync */
1186 set_bit(In_sync
, &rdev
->flags
);
1191 * sync_super for 0.90.0
1193 static void super_90_sync(struct mddev
*mddev
, struct md_rdev
*rdev
)
1196 struct md_rdev
*rdev2
;
1197 int next_spare
= mddev
->raid_disks
;
1199 /* make rdev->sb match mddev data..
1202 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1203 * 3/ any empty disks < next_spare become removed
1205 * disks[0] gets initialised to REMOVED because
1206 * we cannot be sure from other fields if it has
1207 * been initialised or not.
1210 int active
=0, working
=0,failed
=0,spare
=0,nr_disks
=0;
1212 rdev
->sb_size
= MD_SB_BYTES
;
1214 sb
= page_address(rdev
->sb_page
);
1216 memset(sb
, 0, sizeof(*sb
));
1218 sb
->md_magic
= MD_SB_MAGIC
;
1219 sb
->major_version
= mddev
->major_version
;
1220 sb
->patch_version
= mddev
->patch_version
;
1221 sb
->gvalid_words
= 0; /* ignored */
1222 memcpy(&sb
->set_uuid0
, mddev
->uuid
+0, 4);
1223 memcpy(&sb
->set_uuid1
, mddev
->uuid
+4, 4);
1224 memcpy(&sb
->set_uuid2
, mddev
->uuid
+8, 4);
1225 memcpy(&sb
->set_uuid3
, mddev
->uuid
+12,4);
1227 sb
->ctime
= mddev
->ctime
;
1228 sb
->level
= mddev
->level
;
1229 sb
->size
= mddev
->dev_sectors
/ 2;
1230 sb
->raid_disks
= mddev
->raid_disks
;
1231 sb
->md_minor
= mddev
->md_minor
;
1232 sb
->not_persistent
= 0;
1233 sb
->utime
= mddev
->utime
;
1235 sb
->events_hi
= (mddev
->events
>>32);
1236 sb
->events_lo
= (u32
)mddev
->events
;
1238 if (mddev
->reshape_position
== MaxSector
)
1239 sb
->minor_version
= 90;
1241 sb
->minor_version
= 91;
1242 sb
->reshape_position
= mddev
->reshape_position
;
1243 sb
->new_level
= mddev
->new_level
;
1244 sb
->delta_disks
= mddev
->delta_disks
;
1245 sb
->new_layout
= mddev
->new_layout
;
1246 sb
->new_chunk
= mddev
->new_chunk_sectors
<< 9;
1248 mddev
->minor_version
= sb
->minor_version
;
1251 sb
->recovery_cp
= mddev
->recovery_cp
;
1252 sb
->cp_events_hi
= (mddev
->events
>>32);
1253 sb
->cp_events_lo
= (u32
)mddev
->events
;
1254 if (mddev
->recovery_cp
== MaxSector
)
1255 sb
->state
= (1<< MD_SB_CLEAN
);
1257 sb
->recovery_cp
= 0;
1259 sb
->layout
= mddev
->layout
;
1260 sb
->chunk_size
= mddev
->chunk_sectors
<< 9;
1262 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
)
1263 sb
->state
|= (1<<MD_SB_BITMAP_PRESENT
);
1265 sb
->disks
[0].state
= (1<<MD_DISK_REMOVED
);
1266 rdev_for_each(rdev2
, mddev
) {
1269 int is_active
= test_bit(In_sync
, &rdev2
->flags
);
1271 if (rdev2
->raid_disk
>= 0 &&
1272 sb
->minor_version
>= 91)
1273 /* we have nowhere to store the recovery_offset,
1274 * but if it is not below the reshape_position,
1275 * we can piggy-back on that.
1278 if (rdev2
->raid_disk
< 0 ||
1279 test_bit(Faulty
, &rdev2
->flags
))
1282 desc_nr
= rdev2
->raid_disk
;
1284 desc_nr
= next_spare
++;
1285 rdev2
->desc_nr
= desc_nr
;
1286 d
= &sb
->disks
[rdev2
->desc_nr
];
1288 d
->number
= rdev2
->desc_nr
;
1289 d
->major
= MAJOR(rdev2
->bdev
->bd_dev
);
1290 d
->minor
= MINOR(rdev2
->bdev
->bd_dev
);
1292 d
->raid_disk
= rdev2
->raid_disk
;
1294 d
->raid_disk
= rdev2
->desc_nr
; /* compatibility */
1295 if (test_bit(Faulty
, &rdev2
->flags
))
1296 d
->state
= (1<<MD_DISK_FAULTY
);
1297 else if (is_active
) {
1298 d
->state
= (1<<MD_DISK_ACTIVE
);
1299 if (test_bit(In_sync
, &rdev2
->flags
))
1300 d
->state
|= (1<<MD_DISK_SYNC
);
1308 if (test_bit(WriteMostly
, &rdev2
->flags
))
1309 d
->state
|= (1<<MD_DISK_WRITEMOSTLY
);
1311 /* now set the "removed" and "faulty" bits on any missing devices */
1312 for (i
=0 ; i
< mddev
->raid_disks
; i
++) {
1313 mdp_disk_t
*d
= &sb
->disks
[i
];
1314 if (d
->state
== 0 && d
->number
== 0) {
1317 d
->state
= (1<<MD_DISK_REMOVED
);
1318 d
->state
|= (1<<MD_DISK_FAULTY
);
1322 sb
->nr_disks
= nr_disks
;
1323 sb
->active_disks
= active
;
1324 sb
->working_disks
= working
;
1325 sb
->failed_disks
= failed
;
1326 sb
->spare_disks
= spare
;
1328 sb
->this_disk
= sb
->disks
[rdev
->desc_nr
];
1329 sb
->sb_csum
= calc_sb_csum(sb
);
1333 * rdev_size_change for 0.90.0
1335 static unsigned long long
1336 super_90_rdev_size_change(struct md_rdev
*rdev
, sector_t num_sectors
)
1338 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1339 return 0; /* component must fit device */
1340 if (rdev
->mddev
->bitmap_info
.offset
)
1341 return 0; /* can't move bitmap */
1342 rdev
->sb_start
= calc_dev_sboffset(rdev
);
1343 if (!num_sectors
|| num_sectors
> rdev
->sb_start
)
1344 num_sectors
= rdev
->sb_start
;
1345 /* Limit to 4TB as metadata cannot record more than that.
1346 * 4TB == 2^32 KB, or 2*2^32 sectors.
1348 if (num_sectors
>= (2ULL << 32) && rdev
->mddev
->level
>= 1)
1349 num_sectors
= (2ULL << 32) - 2;
1350 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1352 md_super_wait(rdev
->mddev
);
1357 super_90_allow_new_offset(struct md_rdev
*rdev
, unsigned long long new_offset
)
1359 /* non-zero offset changes not possible with v0.90 */
1360 return new_offset
== 0;
1364 * version 1 superblock
1367 static __le32
calc_sb_1_csum(struct mdp_superblock_1
*sb
)
1371 unsigned long long newcsum
;
1372 int size
= 256 + le32_to_cpu(sb
->max_dev
)*2;
1373 __le32
*isuper
= (__le32
*)sb
;
1375 disk_csum
= sb
->sb_csum
;
1378 for (; size
>= 4; size
-= 4)
1379 newcsum
+= le32_to_cpu(*isuper
++);
1382 newcsum
+= le16_to_cpu(*(__le16
*) isuper
);
1384 csum
= (newcsum
& 0xffffffff) + (newcsum
>> 32);
1385 sb
->sb_csum
= disk_csum
;
1386 return cpu_to_le32(csum
);
1389 static int md_set_badblocks(struct badblocks
*bb
, sector_t s
, int sectors
,
1391 static int super_1_load(struct md_rdev
*rdev
, struct md_rdev
*refdev
, int minor_version
)
1393 struct mdp_superblock_1
*sb
;
1397 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1401 * Calculate the position of the superblock in 512byte sectors.
1402 * It is always aligned to a 4K boundary and
1403 * depeding on minor_version, it can be:
1404 * 0: At least 8K, but less than 12K, from end of device
1405 * 1: At start of device
1406 * 2: 4K from start of device.
1408 switch(minor_version
) {
1410 sb_start
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1412 sb_start
&= ~(sector_t
)(4*2-1);
1423 rdev
->sb_start
= sb_start
;
1425 /* superblock is rarely larger than 1K, but it can be larger,
1426 * and it is safe to read 4k, so we do that
1428 ret
= read_disk_sb(rdev
, 4096);
1429 if (ret
) return ret
;
1431 sb
= page_address(rdev
->sb_page
);
1433 if (sb
->magic
!= cpu_to_le32(MD_SB_MAGIC
) ||
1434 sb
->major_version
!= cpu_to_le32(1) ||
1435 le32_to_cpu(sb
->max_dev
) > (4096-256)/2 ||
1436 le64_to_cpu(sb
->super_offset
) != rdev
->sb_start
||
1437 (le32_to_cpu(sb
->feature_map
) & ~MD_FEATURE_ALL
) != 0)
1440 if (calc_sb_1_csum(sb
) != sb
->sb_csum
) {
1441 printk("md: invalid superblock checksum on %s\n",
1442 bdevname(rdev
->bdev
,b
));
1445 if (le64_to_cpu(sb
->data_size
) < 10) {
1446 printk("md: data_size too small on %s\n",
1447 bdevname(rdev
->bdev
,b
));
1452 memcmp(sb
->pad3
, sb
->pad3
+1, sizeof(sb
->pad3
) - sizeof(sb
->pad3
[1])))
1453 /* Some padding is non-zero, might be a new feature */
1456 rdev
->preferred_minor
= 0xffff;
1457 rdev
->data_offset
= le64_to_cpu(sb
->data_offset
);
1458 rdev
->new_data_offset
= rdev
->data_offset
;
1459 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
) &&
1460 (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_NEW_OFFSET
))
1461 rdev
->new_data_offset
+= (s32
)le32_to_cpu(sb
->new_offset
);
1462 atomic_set(&rdev
->corrected_errors
, le32_to_cpu(sb
->cnt_corrected_read
));
1464 rdev
->sb_size
= le32_to_cpu(sb
->max_dev
) * 2 + 256;
1465 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1466 if (rdev
->sb_size
& bmask
)
1467 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1470 && rdev
->data_offset
< sb_start
+ (rdev
->sb_size
/512))
1473 && rdev
->new_data_offset
< sb_start
+ (rdev
->sb_size
/512))
1476 if (sb
->level
== cpu_to_le32(LEVEL_MULTIPATH
))
1479 rdev
->desc_nr
= le32_to_cpu(sb
->dev_number
);
1481 if (!rdev
->bb_page
) {
1482 rdev
->bb_page
= alloc_page(GFP_KERNEL
);
1486 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BAD_BLOCKS
) &&
1487 rdev
->badblocks
.count
== 0) {
1488 /* need to load the bad block list.
1489 * Currently we limit it to one page.
1495 int sectors
= le16_to_cpu(sb
->bblog_size
);
1496 if (sectors
> (PAGE_SIZE
/ 512))
1498 offset
= le32_to_cpu(sb
->bblog_offset
);
1501 bb_sector
= (long long)offset
;
1502 if (!sync_page_io(rdev
, bb_sector
, sectors
<< 9,
1503 rdev
->bb_page
, READ
, true))
1505 bbp
= (u64
*)page_address(rdev
->bb_page
);
1506 rdev
->badblocks
.shift
= sb
->bblog_shift
;
1507 for (i
= 0 ; i
< (sectors
<< (9-3)) ; i
++, bbp
++) {
1508 u64 bb
= le64_to_cpu(*bbp
);
1509 int count
= bb
& (0x3ff);
1510 u64 sector
= bb
>> 10;
1511 sector
<<= sb
->bblog_shift
;
1512 count
<<= sb
->bblog_shift
;
1515 if (md_set_badblocks(&rdev
->badblocks
,
1516 sector
, count
, 1) == 0)
1519 } else if (sb
->bblog_offset
!= 0)
1520 rdev
->badblocks
.shift
= 0;
1526 struct mdp_superblock_1
*refsb
= page_address(refdev
->sb_page
);
1528 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16) != 0 ||
1529 sb
->level
!= refsb
->level
||
1530 sb
->layout
!= refsb
->layout
||
1531 sb
->chunksize
!= refsb
->chunksize
) {
1532 printk(KERN_WARNING
"md: %s has strangely different"
1533 " superblock to %s\n",
1534 bdevname(rdev
->bdev
,b
),
1535 bdevname(refdev
->bdev
,b2
));
1538 ev1
= le64_to_cpu(sb
->events
);
1539 ev2
= le64_to_cpu(refsb
->events
);
1546 if (minor_version
) {
1547 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9);
1548 sectors
-= rdev
->data_offset
;
1550 sectors
= rdev
->sb_start
;
1551 if (sectors
< le64_to_cpu(sb
->data_size
))
1553 rdev
->sectors
= le64_to_cpu(sb
->data_size
);
1557 static int super_1_validate(struct mddev
*mddev
, struct md_rdev
*rdev
)
1559 struct mdp_superblock_1
*sb
= page_address(rdev
->sb_page
);
1560 __u64 ev1
= le64_to_cpu(sb
->events
);
1562 rdev
->raid_disk
= -1;
1563 clear_bit(Faulty
, &rdev
->flags
);
1564 clear_bit(In_sync
, &rdev
->flags
);
1565 clear_bit(Bitmap_sync
, &rdev
->flags
);
1566 clear_bit(WriteMostly
, &rdev
->flags
);
1568 if (mddev
->raid_disks
== 0) {
1569 mddev
->major_version
= 1;
1570 mddev
->patch_version
= 0;
1571 mddev
->external
= 0;
1572 mddev
->chunk_sectors
= le32_to_cpu(sb
->chunksize
);
1573 mddev
->ctime
= le64_to_cpu(sb
->ctime
) & ((1ULL << 32)-1);
1574 mddev
->utime
= le64_to_cpu(sb
->utime
) & ((1ULL << 32)-1);
1575 mddev
->level
= le32_to_cpu(sb
->level
);
1576 mddev
->clevel
[0] = 0;
1577 mddev
->layout
= le32_to_cpu(sb
->layout
);
1578 mddev
->raid_disks
= le32_to_cpu(sb
->raid_disks
);
1579 mddev
->dev_sectors
= le64_to_cpu(sb
->size
);
1580 mddev
->events
= ev1
;
1581 mddev
->bitmap_info
.offset
= 0;
1582 mddev
->bitmap_info
.space
= 0;
1583 /* Default location for bitmap is 1K after superblock
1584 * using 3K - total of 4K
1586 mddev
->bitmap_info
.default_offset
= 1024 >> 9;
1587 mddev
->bitmap_info
.default_space
= (4096-1024) >> 9;
1588 mddev
->reshape_backwards
= 0;
1590 mddev
->recovery_cp
= le64_to_cpu(sb
->resync_offset
);
1591 memcpy(mddev
->uuid
, sb
->set_uuid
, 16);
1593 mddev
->max_disks
= (4096-256)/2;
1595 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
) &&
1596 mddev
->bitmap_info
.file
== NULL
) {
1597 mddev
->bitmap_info
.offset
=
1598 (__s32
)le32_to_cpu(sb
->bitmap_offset
);
1599 /* Metadata doesn't record how much space is available.
1600 * For 1.0, we assume we can use up to the superblock
1601 * if before, else to 4K beyond superblock.
1602 * For others, assume no change is possible.
1604 if (mddev
->minor_version
> 0)
1605 mddev
->bitmap_info
.space
= 0;
1606 else if (mddev
->bitmap_info
.offset
> 0)
1607 mddev
->bitmap_info
.space
=
1608 8 - mddev
->bitmap_info
.offset
;
1610 mddev
->bitmap_info
.space
=
1611 -mddev
->bitmap_info
.offset
;
1614 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
1615 mddev
->reshape_position
= le64_to_cpu(sb
->reshape_position
);
1616 mddev
->delta_disks
= le32_to_cpu(sb
->delta_disks
);
1617 mddev
->new_level
= le32_to_cpu(sb
->new_level
);
1618 mddev
->new_layout
= le32_to_cpu(sb
->new_layout
);
1619 mddev
->new_chunk_sectors
= le32_to_cpu(sb
->new_chunk
);
1620 if (mddev
->delta_disks
< 0 ||
1621 (mddev
->delta_disks
== 0 &&
1622 (le32_to_cpu(sb
->feature_map
)
1623 & MD_FEATURE_RESHAPE_BACKWARDS
)))
1624 mddev
->reshape_backwards
= 1;
1626 mddev
->reshape_position
= MaxSector
;
1627 mddev
->delta_disks
= 0;
1628 mddev
->new_level
= mddev
->level
;
1629 mddev
->new_layout
= mddev
->layout
;
1630 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1633 } else if (mddev
->pers
== NULL
) {
1634 /* Insist of good event counter while assembling, except for
1635 * spares (which don't need an event count) */
1637 if (rdev
->desc_nr
>= 0 &&
1638 rdev
->desc_nr
< le32_to_cpu(sb
->max_dev
) &&
1639 le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]) < 0xfffe)
1640 if (ev1
< mddev
->events
)
1642 } else if (mddev
->bitmap
) {
1643 /* If adding to array with a bitmap, then we can accept an
1644 * older device, but not too old.
1646 if (ev1
< mddev
->bitmap
->events_cleared
)
1648 if (ev1
< mddev
->events
)
1649 set_bit(Bitmap_sync
, &rdev
->flags
);
1651 if (ev1
< mddev
->events
)
1652 /* just a hot-add of a new device, leave raid_disk at -1 */
1655 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1657 if (rdev
->desc_nr
< 0 ||
1658 rdev
->desc_nr
>= le32_to_cpu(sb
->max_dev
)) {
1662 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
1664 case 0xffff: /* spare */
1666 case 0xfffe: /* faulty */
1667 set_bit(Faulty
, &rdev
->flags
);
1670 rdev
->saved_raid_disk
= role
;
1671 if ((le32_to_cpu(sb
->feature_map
) &
1672 MD_FEATURE_RECOVERY_OFFSET
)) {
1673 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
1674 if (!(le32_to_cpu(sb
->feature_map
) &
1675 MD_FEATURE_RECOVERY_BITMAP
))
1676 rdev
->saved_raid_disk
= -1;
1678 set_bit(In_sync
, &rdev
->flags
);
1679 rdev
->raid_disk
= role
;
1682 if (sb
->devflags
& WriteMostly1
)
1683 set_bit(WriteMostly
, &rdev
->flags
);
1684 if (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_REPLACEMENT
)
1685 set_bit(Replacement
, &rdev
->flags
);
1686 } else /* MULTIPATH are always insync */
1687 set_bit(In_sync
, &rdev
->flags
);
1692 static void super_1_sync(struct mddev
*mddev
, struct md_rdev
*rdev
)
1694 struct mdp_superblock_1
*sb
;
1695 struct md_rdev
*rdev2
;
1697 /* make rdev->sb match mddev and rdev data. */
1699 sb
= page_address(rdev
->sb_page
);
1701 sb
->feature_map
= 0;
1703 sb
->recovery_offset
= cpu_to_le64(0);
1704 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
1706 sb
->utime
= cpu_to_le64((__u64
)mddev
->utime
);
1707 sb
->events
= cpu_to_le64(mddev
->events
);
1709 sb
->resync_offset
= cpu_to_le64(mddev
->recovery_cp
);
1711 sb
->resync_offset
= cpu_to_le64(0);
1713 sb
->cnt_corrected_read
= cpu_to_le32(atomic_read(&rdev
->corrected_errors
));
1715 sb
->raid_disks
= cpu_to_le32(mddev
->raid_disks
);
1716 sb
->size
= cpu_to_le64(mddev
->dev_sectors
);
1717 sb
->chunksize
= cpu_to_le32(mddev
->chunk_sectors
);
1718 sb
->level
= cpu_to_le32(mddev
->level
);
1719 sb
->layout
= cpu_to_le32(mddev
->layout
);
1721 if (test_bit(WriteMostly
, &rdev
->flags
))
1722 sb
->devflags
|= WriteMostly1
;
1724 sb
->devflags
&= ~WriteMostly1
;
1725 sb
->data_offset
= cpu_to_le64(rdev
->data_offset
);
1726 sb
->data_size
= cpu_to_le64(rdev
->sectors
);
1728 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
) {
1729 sb
->bitmap_offset
= cpu_to_le32((__u32
)mddev
->bitmap_info
.offset
);
1730 sb
->feature_map
= cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
);
1733 if (rdev
->raid_disk
>= 0 &&
1734 !test_bit(In_sync
, &rdev
->flags
)) {
1736 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET
);
1737 sb
->recovery_offset
=
1738 cpu_to_le64(rdev
->recovery_offset
);
1739 if (rdev
->saved_raid_disk
>= 0 && mddev
->bitmap
)
1741 cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP
);
1743 if (test_bit(Replacement
, &rdev
->flags
))
1745 cpu_to_le32(MD_FEATURE_REPLACEMENT
);
1747 if (mddev
->reshape_position
!= MaxSector
) {
1748 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE
);
1749 sb
->reshape_position
= cpu_to_le64(mddev
->reshape_position
);
1750 sb
->new_layout
= cpu_to_le32(mddev
->new_layout
);
1751 sb
->delta_disks
= cpu_to_le32(mddev
->delta_disks
);
1752 sb
->new_level
= cpu_to_le32(mddev
->new_level
);
1753 sb
->new_chunk
= cpu_to_le32(mddev
->new_chunk_sectors
);
1754 if (mddev
->delta_disks
== 0 &&
1755 mddev
->reshape_backwards
)
1757 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS
);
1758 if (rdev
->new_data_offset
!= rdev
->data_offset
) {
1760 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET
);
1761 sb
->new_offset
= cpu_to_le32((__u32
)(rdev
->new_data_offset
1762 - rdev
->data_offset
));
1766 if (rdev
->badblocks
.count
== 0)
1767 /* Nothing to do for bad blocks*/ ;
1768 else if (sb
->bblog_offset
== 0)
1769 /* Cannot record bad blocks on this device */
1770 md_error(mddev
, rdev
);
1772 struct badblocks
*bb
= &rdev
->badblocks
;
1773 u64
*bbp
= (u64
*)page_address(rdev
->bb_page
);
1775 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_BAD_BLOCKS
);
1780 seq
= read_seqbegin(&bb
->lock
);
1782 memset(bbp
, 0xff, PAGE_SIZE
);
1784 for (i
= 0 ; i
< bb
->count
; i
++) {
1785 u64 internal_bb
= p
[i
];
1786 u64 store_bb
= ((BB_OFFSET(internal_bb
) << 10)
1787 | BB_LEN(internal_bb
));
1788 bbp
[i
] = cpu_to_le64(store_bb
);
1791 if (read_seqretry(&bb
->lock
, seq
))
1794 bb
->sector
= (rdev
->sb_start
+
1795 (int)le32_to_cpu(sb
->bblog_offset
));
1796 bb
->size
= le16_to_cpu(sb
->bblog_size
);
1801 rdev_for_each(rdev2
, mddev
)
1802 if (rdev2
->desc_nr
+1 > max_dev
)
1803 max_dev
= rdev2
->desc_nr
+1;
1805 if (max_dev
> le32_to_cpu(sb
->max_dev
)) {
1807 sb
->max_dev
= cpu_to_le32(max_dev
);
1808 rdev
->sb_size
= max_dev
* 2 + 256;
1809 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1810 if (rdev
->sb_size
& bmask
)
1811 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1813 max_dev
= le32_to_cpu(sb
->max_dev
);
1815 for (i
=0; i
<max_dev
;i
++)
1816 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1818 rdev_for_each(rdev2
, mddev
) {
1820 if (test_bit(Faulty
, &rdev2
->flags
))
1821 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1822 else if (test_bit(In_sync
, &rdev2
->flags
))
1823 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1824 else if (rdev2
->raid_disk
>= 0)
1825 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1827 sb
->dev_roles
[i
] = cpu_to_le16(0xffff);
1830 sb
->sb_csum
= calc_sb_1_csum(sb
);
1833 static unsigned long long
1834 super_1_rdev_size_change(struct md_rdev
*rdev
, sector_t num_sectors
)
1836 struct mdp_superblock_1
*sb
;
1837 sector_t max_sectors
;
1838 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1839 return 0; /* component must fit device */
1840 if (rdev
->data_offset
!= rdev
->new_data_offset
)
1841 return 0; /* too confusing */
1842 if (rdev
->sb_start
< rdev
->data_offset
) {
1843 /* minor versions 1 and 2; superblock before data */
1844 max_sectors
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1845 max_sectors
-= rdev
->data_offset
;
1846 if (!num_sectors
|| num_sectors
> max_sectors
)
1847 num_sectors
= max_sectors
;
1848 } else if (rdev
->mddev
->bitmap_info
.offset
) {
1849 /* minor version 0 with bitmap we can't move */
1852 /* minor version 0; superblock after data */
1854 sb_start
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) - 8*2;
1855 sb_start
&= ~(sector_t
)(4*2 - 1);
1856 max_sectors
= rdev
->sectors
+ sb_start
- rdev
->sb_start
;
1857 if (!num_sectors
|| num_sectors
> max_sectors
)
1858 num_sectors
= max_sectors
;
1859 rdev
->sb_start
= sb_start
;
1861 sb
= page_address(rdev
->sb_page
);
1862 sb
->data_size
= cpu_to_le64(num_sectors
);
1863 sb
->super_offset
= rdev
->sb_start
;
1864 sb
->sb_csum
= calc_sb_1_csum(sb
);
1865 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1867 md_super_wait(rdev
->mddev
);
1873 super_1_allow_new_offset(struct md_rdev
*rdev
,
1874 unsigned long long new_offset
)
1876 /* All necessary checks on new >= old have been done */
1877 struct bitmap
*bitmap
;
1878 if (new_offset
>= rdev
->data_offset
)
1881 /* with 1.0 metadata, there is no metadata to tread on
1882 * so we can always move back */
1883 if (rdev
->mddev
->minor_version
== 0)
1886 /* otherwise we must be sure not to step on
1887 * any metadata, so stay:
1888 * 36K beyond start of superblock
1889 * beyond end of badblocks
1890 * beyond write-intent bitmap
1892 if (rdev
->sb_start
+ (32+4)*2 > new_offset
)
1894 bitmap
= rdev
->mddev
->bitmap
;
1895 if (bitmap
&& !rdev
->mddev
->bitmap_info
.file
&&
1896 rdev
->sb_start
+ rdev
->mddev
->bitmap_info
.offset
+
1897 bitmap
->storage
.file_pages
* (PAGE_SIZE
>>9) > new_offset
)
1899 if (rdev
->badblocks
.sector
+ rdev
->badblocks
.size
> new_offset
)
1905 static struct super_type super_types
[] = {
1908 .owner
= THIS_MODULE
,
1909 .load_super
= super_90_load
,
1910 .validate_super
= super_90_validate
,
1911 .sync_super
= super_90_sync
,
1912 .rdev_size_change
= super_90_rdev_size_change
,
1913 .allow_new_offset
= super_90_allow_new_offset
,
1917 .owner
= THIS_MODULE
,
1918 .load_super
= super_1_load
,
1919 .validate_super
= super_1_validate
,
1920 .sync_super
= super_1_sync
,
1921 .rdev_size_change
= super_1_rdev_size_change
,
1922 .allow_new_offset
= super_1_allow_new_offset
,
1926 static void sync_super(struct mddev
*mddev
, struct md_rdev
*rdev
)
1928 if (mddev
->sync_super
) {
1929 mddev
->sync_super(mddev
, rdev
);
1933 BUG_ON(mddev
->major_version
>= ARRAY_SIZE(super_types
));
1935 super_types
[mddev
->major_version
].sync_super(mddev
, rdev
);
1938 static int match_mddev_units(struct mddev
*mddev1
, struct mddev
*mddev2
)
1940 struct md_rdev
*rdev
, *rdev2
;
1943 rdev_for_each_rcu(rdev
, mddev1
)
1944 rdev_for_each_rcu(rdev2
, mddev2
)
1945 if (rdev
->bdev
->bd_contains
==
1946 rdev2
->bdev
->bd_contains
) {
1954 static LIST_HEAD(pending_raid_disks
);
1957 * Try to register data integrity profile for an mddev
1959 * This is called when an array is started and after a disk has been kicked
1960 * from the array. It only succeeds if all working and active component devices
1961 * are integrity capable with matching profiles.
1963 int md_integrity_register(struct mddev
*mddev
)
1965 struct md_rdev
*rdev
, *reference
= NULL
;
1967 if (list_empty(&mddev
->disks
))
1968 return 0; /* nothing to do */
1969 if (!mddev
->gendisk
|| blk_get_integrity(mddev
->gendisk
))
1970 return 0; /* shouldn't register, or already is */
1971 rdev_for_each(rdev
, mddev
) {
1972 /* skip spares and non-functional disks */
1973 if (test_bit(Faulty
, &rdev
->flags
))
1975 if (rdev
->raid_disk
< 0)
1978 /* Use the first rdev as the reference */
1982 /* does this rdev's profile match the reference profile? */
1983 if (blk_integrity_compare(reference
->bdev
->bd_disk
,
1984 rdev
->bdev
->bd_disk
) < 0)
1987 if (!reference
|| !bdev_get_integrity(reference
->bdev
))
1990 * All component devices are integrity capable and have matching
1991 * profiles, register the common profile for the md device.
1993 if (blk_integrity_register(mddev
->gendisk
,
1994 bdev_get_integrity(reference
->bdev
)) != 0) {
1995 printk(KERN_ERR
"md: failed to register integrity for %s\n",
1999 printk(KERN_NOTICE
"md: data integrity enabled on %s\n", mdname(mddev
));
2000 if (bioset_integrity_create(mddev
->bio_set
, BIO_POOL_SIZE
)) {
2001 printk(KERN_ERR
"md: failed to create integrity pool for %s\n",
2007 EXPORT_SYMBOL(md_integrity_register
);
2009 /* Disable data integrity if non-capable/non-matching disk is being added */
2010 void md_integrity_add_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
2012 struct blk_integrity
*bi_rdev
;
2013 struct blk_integrity
*bi_mddev
;
2015 if (!mddev
->gendisk
)
2018 bi_rdev
= bdev_get_integrity(rdev
->bdev
);
2019 bi_mddev
= blk_get_integrity(mddev
->gendisk
);
2021 if (!bi_mddev
) /* nothing to do */
2023 if (rdev
->raid_disk
< 0) /* skip spares */
2025 if (bi_rdev
&& blk_integrity_compare(mddev
->gendisk
,
2026 rdev
->bdev
->bd_disk
) >= 0)
2028 printk(KERN_NOTICE
"disabling data integrity on %s\n", mdname(mddev
));
2029 blk_integrity_unregister(mddev
->gendisk
);
2031 EXPORT_SYMBOL(md_integrity_add_rdev
);
2033 static int bind_rdev_to_array(struct md_rdev
*rdev
, struct mddev
*mddev
)
2035 char b
[BDEVNAME_SIZE
];
2040 /* prevent duplicates */
2041 if (find_rdev(mddev
, rdev
->bdev
->bd_dev
))
2044 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2045 if (rdev
->sectors
&& (mddev
->dev_sectors
== 0 ||
2046 rdev
->sectors
< mddev
->dev_sectors
)) {
2048 /* Cannot change size, so fail
2049 * If mddev->level <= 0, then we don't care
2050 * about aligning sizes (e.g. linear)
2052 if (mddev
->level
> 0)
2055 mddev
->dev_sectors
= rdev
->sectors
;
2058 /* Verify rdev->desc_nr is unique.
2059 * If it is -1, assign a free number, else
2060 * check number is not in use
2063 if (rdev
->desc_nr
< 0) {
2066 choice
= mddev
->raid_disks
;
2067 while (find_rdev_nr_rcu(mddev
, choice
))
2069 rdev
->desc_nr
= choice
;
2071 if (find_rdev_nr_rcu(mddev
, rdev
->desc_nr
)) {
2077 if (mddev
->max_disks
&& rdev
->desc_nr
>= mddev
->max_disks
) {
2078 printk(KERN_WARNING
"md: %s: array is limited to %d devices\n",
2079 mdname(mddev
), mddev
->max_disks
);
2082 bdevname(rdev
->bdev
,b
);
2083 while ( (s
=strchr(b
, '/')) != NULL
)
2086 rdev
->mddev
= mddev
;
2087 printk(KERN_INFO
"md: bind<%s>\n", b
);
2089 if ((err
= kobject_add(&rdev
->kobj
, &mddev
->kobj
, "dev-%s", b
)))
2092 ko
= &part_to_dev(rdev
->bdev
->bd_part
)->kobj
;
2093 if (sysfs_create_link(&rdev
->kobj
, ko
, "block"))
2094 /* failure here is OK */;
2095 rdev
->sysfs_state
= sysfs_get_dirent_safe(rdev
->kobj
.sd
, "state");
2097 list_add_rcu(&rdev
->same_set
, &mddev
->disks
);
2098 bd_link_disk_holder(rdev
->bdev
, mddev
->gendisk
);
2100 /* May as well allow recovery to be retried once */
2101 mddev
->recovery_disabled
++;
2106 printk(KERN_WARNING
"md: failed to register dev-%s for %s\n",
2111 static void md_delayed_delete(struct work_struct
*ws
)
2113 struct md_rdev
*rdev
= container_of(ws
, struct md_rdev
, del_work
);
2114 kobject_del(&rdev
->kobj
);
2115 kobject_put(&rdev
->kobj
);
2118 static void unbind_rdev_from_array(struct md_rdev
*rdev
)
2120 char b
[BDEVNAME_SIZE
];
2122 bd_unlink_disk_holder(rdev
->bdev
, rdev
->mddev
->gendisk
);
2123 list_del_rcu(&rdev
->same_set
);
2124 printk(KERN_INFO
"md: unbind<%s>\n", bdevname(rdev
->bdev
,b
));
2126 sysfs_remove_link(&rdev
->kobj
, "block");
2127 sysfs_put(rdev
->sysfs_state
);
2128 rdev
->sysfs_state
= NULL
;
2129 rdev
->badblocks
.count
= 0;
2130 /* We need to delay this, otherwise we can deadlock when
2131 * writing to 'remove' to "dev/state". We also need
2132 * to delay it due to rcu usage.
2135 INIT_WORK(&rdev
->del_work
, md_delayed_delete
);
2136 kobject_get(&rdev
->kobj
);
2137 queue_work(md_misc_wq
, &rdev
->del_work
);
2141 * prevent the device from being mounted, repartitioned or
2142 * otherwise reused by a RAID array (or any other kernel
2143 * subsystem), by bd_claiming the device.
2145 static int lock_rdev(struct md_rdev
*rdev
, dev_t dev
, int shared
)
2148 struct block_device
*bdev
;
2149 char b
[BDEVNAME_SIZE
];
2151 bdev
= blkdev_get_by_dev(dev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
,
2152 shared
? (struct md_rdev
*)lock_rdev
: rdev
);
2154 printk(KERN_ERR
"md: could not open %s.\n",
2155 __bdevname(dev
, b
));
2156 return PTR_ERR(bdev
);
2162 static void unlock_rdev(struct md_rdev
*rdev
)
2164 struct block_device
*bdev
= rdev
->bdev
;
2166 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
);
2169 void md_autodetect_dev(dev_t dev
);
2171 static void export_rdev(struct md_rdev
*rdev
)
2173 char b
[BDEVNAME_SIZE
];
2175 printk(KERN_INFO
"md: export_rdev(%s)\n",
2176 bdevname(rdev
->bdev
,b
));
2177 md_rdev_clear(rdev
);
2179 if (test_bit(AutoDetected
, &rdev
->flags
))
2180 md_autodetect_dev(rdev
->bdev
->bd_dev
);
2183 kobject_put(&rdev
->kobj
);
2186 static void kick_rdev_from_array(struct md_rdev
*rdev
)
2188 unbind_rdev_from_array(rdev
);
2192 static void export_array(struct mddev
*mddev
)
2194 struct md_rdev
*rdev
;
2196 while (!list_empty(&mddev
->disks
)) {
2197 rdev
= list_first_entry(&mddev
->disks
, struct md_rdev
,
2199 kick_rdev_from_array(rdev
);
2201 mddev
->raid_disks
= 0;
2202 mddev
->major_version
= 0;
2205 static void sync_sbs(struct mddev
*mddev
, int nospares
)
2207 /* Update each superblock (in-memory image), but
2208 * if we are allowed to, skip spares which already
2209 * have the right event counter, or have one earlier
2210 * (which would mean they aren't being marked as dirty
2211 * with the rest of the array)
2213 struct md_rdev
*rdev
;
2214 rdev_for_each(rdev
, mddev
) {
2215 if (rdev
->sb_events
== mddev
->events
||
2217 rdev
->raid_disk
< 0 &&
2218 rdev
->sb_events
+1 == mddev
->events
)) {
2219 /* Don't update this superblock */
2220 rdev
->sb_loaded
= 2;
2222 sync_super(mddev
, rdev
);
2223 rdev
->sb_loaded
= 1;
2228 static void md_update_sb(struct mddev
*mddev
, int force_change
)
2230 struct md_rdev
*rdev
;
2233 int any_badblocks_changed
= 0;
2237 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
2241 /* First make sure individual recovery_offsets are correct */
2242 rdev_for_each(rdev
, mddev
) {
2243 if (rdev
->raid_disk
>= 0 &&
2244 mddev
->delta_disks
>= 0 &&
2245 !test_bit(In_sync
, &rdev
->flags
) &&
2246 mddev
->curr_resync_completed
> rdev
->recovery_offset
)
2247 rdev
->recovery_offset
= mddev
->curr_resync_completed
;
2250 if (!mddev
->persistent
) {
2251 clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
2252 clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
2253 if (!mddev
->external
) {
2254 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2255 rdev_for_each(rdev
, mddev
) {
2256 if (rdev
->badblocks
.changed
) {
2257 rdev
->badblocks
.changed
= 0;
2258 md_ack_all_badblocks(&rdev
->badblocks
);
2259 md_error(mddev
, rdev
);
2261 clear_bit(Blocked
, &rdev
->flags
);
2262 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2263 wake_up(&rdev
->blocked_wait
);
2266 wake_up(&mddev
->sb_wait
);
2270 spin_lock(&mddev
->lock
);
2272 mddev
->utime
= get_seconds();
2274 if (test_and_clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
))
2276 if (test_and_clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
2277 /* just a clean<-> dirty transition, possibly leave spares alone,
2278 * though if events isn't the right even/odd, we will have to do
2284 if (mddev
->degraded
)
2285 /* If the array is degraded, then skipping spares is both
2286 * dangerous and fairly pointless.
2287 * Dangerous because a device that was removed from the array
2288 * might have a event_count that still looks up-to-date,
2289 * so it can be re-added without a resync.
2290 * Pointless because if there are any spares to skip,
2291 * then a recovery will happen and soon that array won't
2292 * be degraded any more and the spare can go back to sleep then.
2296 sync_req
= mddev
->in_sync
;
2298 /* If this is just a dirty<->clean transition, and the array is clean
2299 * and 'events' is odd, we can roll back to the previous clean state */
2301 && (mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
2302 && mddev
->can_decrease_events
2303 && mddev
->events
!= 1) {
2305 mddev
->can_decrease_events
= 0;
2307 /* otherwise we have to go forward and ... */
2309 mddev
->can_decrease_events
= nospares
;
2313 * This 64-bit counter should never wrap.
2314 * Either we are in around ~1 trillion A.C., assuming
2315 * 1 reboot per second, or we have a bug...
2317 WARN_ON(mddev
->events
== 0);
2319 rdev_for_each(rdev
, mddev
) {
2320 if (rdev
->badblocks
.changed
)
2321 any_badblocks_changed
++;
2322 if (test_bit(Faulty
, &rdev
->flags
))
2323 set_bit(FaultRecorded
, &rdev
->flags
);
2326 sync_sbs(mddev
, nospares
);
2327 spin_unlock(&mddev
->lock
);
2329 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2330 mdname(mddev
), mddev
->in_sync
);
2332 bitmap_update_sb(mddev
->bitmap
);
2333 rdev_for_each(rdev
, mddev
) {
2334 char b
[BDEVNAME_SIZE
];
2336 if (rdev
->sb_loaded
!= 1)
2337 continue; /* no noise on spare devices */
2339 if (!test_bit(Faulty
, &rdev
->flags
)) {
2340 md_super_write(mddev
,rdev
,
2341 rdev
->sb_start
, rdev
->sb_size
,
2343 pr_debug("md: (write) %s's sb offset: %llu\n",
2344 bdevname(rdev
->bdev
, b
),
2345 (unsigned long long)rdev
->sb_start
);
2346 rdev
->sb_events
= mddev
->events
;
2347 if (rdev
->badblocks
.size
) {
2348 md_super_write(mddev
, rdev
,
2349 rdev
->badblocks
.sector
,
2350 rdev
->badblocks
.size
<< 9,
2352 rdev
->badblocks
.size
= 0;
2356 pr_debug("md: %s (skipping faulty)\n",
2357 bdevname(rdev
->bdev
, b
));
2359 if (mddev
->level
== LEVEL_MULTIPATH
)
2360 /* only need to write one superblock... */
2363 md_super_wait(mddev
);
2364 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2366 spin_lock(&mddev
->lock
);
2367 if (mddev
->in_sync
!= sync_req
||
2368 test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
2369 /* have to write it out again */
2370 spin_unlock(&mddev
->lock
);
2373 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2374 spin_unlock(&mddev
->lock
);
2375 wake_up(&mddev
->sb_wait
);
2376 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
2377 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
2379 rdev_for_each(rdev
, mddev
) {
2380 if (test_and_clear_bit(FaultRecorded
, &rdev
->flags
))
2381 clear_bit(Blocked
, &rdev
->flags
);
2383 if (any_badblocks_changed
)
2384 md_ack_all_badblocks(&rdev
->badblocks
);
2385 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2386 wake_up(&rdev
->blocked_wait
);
2390 /* words written to sysfs files may, or may not, be \n terminated.
2391 * We want to accept with case. For this we use cmd_match.
2393 static int cmd_match(const char *cmd
, const char *str
)
2395 /* See if cmd, written into a sysfs file, matches
2396 * str. They must either be the same, or cmd can
2397 * have a trailing newline
2399 while (*cmd
&& *str
&& *cmd
== *str
) {
2410 struct rdev_sysfs_entry
{
2411 struct attribute attr
;
2412 ssize_t (*show
)(struct md_rdev
*, char *);
2413 ssize_t (*store
)(struct md_rdev
*, const char *, size_t);
2417 state_show(struct md_rdev
*rdev
, char *page
)
2422 if (test_bit(Faulty
, &rdev
->flags
) ||
2423 rdev
->badblocks
.unacked_exist
) {
2424 len
+= sprintf(page
+len
, "%sfaulty",sep
);
2427 if (test_bit(In_sync
, &rdev
->flags
)) {
2428 len
+= sprintf(page
+len
, "%sin_sync",sep
);
2431 if (test_bit(WriteMostly
, &rdev
->flags
)) {
2432 len
+= sprintf(page
+len
, "%swrite_mostly",sep
);
2435 if (test_bit(Blocked
, &rdev
->flags
) ||
2436 (rdev
->badblocks
.unacked_exist
2437 && !test_bit(Faulty
, &rdev
->flags
))) {
2438 len
+= sprintf(page
+len
, "%sblocked", sep
);
2441 if (!test_bit(Faulty
, &rdev
->flags
) &&
2442 !test_bit(In_sync
, &rdev
->flags
)) {
2443 len
+= sprintf(page
+len
, "%sspare", sep
);
2446 if (test_bit(WriteErrorSeen
, &rdev
->flags
)) {
2447 len
+= sprintf(page
+len
, "%swrite_error", sep
);
2450 if (test_bit(WantReplacement
, &rdev
->flags
)) {
2451 len
+= sprintf(page
+len
, "%swant_replacement", sep
);
2454 if (test_bit(Replacement
, &rdev
->flags
)) {
2455 len
+= sprintf(page
+len
, "%sreplacement", sep
);
2459 return len
+sprintf(page
+len
, "\n");
2463 state_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2466 * faulty - simulates an error
2467 * remove - disconnects the device
2468 * writemostly - sets write_mostly
2469 * -writemostly - clears write_mostly
2470 * blocked - sets the Blocked flags
2471 * -blocked - clears the Blocked and possibly simulates an error
2472 * insync - sets Insync providing device isn't active
2473 * -insync - clear Insync for a device with a slot assigned,
2474 * so that it gets rebuilt based on bitmap
2475 * write_error - sets WriteErrorSeen
2476 * -write_error - clears WriteErrorSeen
2479 if (cmd_match(buf
, "faulty") && rdev
->mddev
->pers
) {
2480 md_error(rdev
->mddev
, rdev
);
2481 if (test_bit(Faulty
, &rdev
->flags
))
2485 } else if (cmd_match(buf
, "remove")) {
2486 if (rdev
->raid_disk
>= 0)
2489 struct mddev
*mddev
= rdev
->mddev
;
2490 kick_rdev_from_array(rdev
);
2492 md_update_sb(mddev
, 1);
2493 md_new_event(mddev
);
2496 } else if (cmd_match(buf
, "writemostly")) {
2497 set_bit(WriteMostly
, &rdev
->flags
);
2499 } else if (cmd_match(buf
, "-writemostly")) {
2500 clear_bit(WriteMostly
, &rdev
->flags
);
2502 } else if (cmd_match(buf
, "blocked")) {
2503 set_bit(Blocked
, &rdev
->flags
);
2505 } else if (cmd_match(buf
, "-blocked")) {
2506 if (!test_bit(Faulty
, &rdev
->flags
) &&
2507 rdev
->badblocks
.unacked_exist
) {
2508 /* metadata handler doesn't understand badblocks,
2509 * so we need to fail the device
2511 md_error(rdev
->mddev
, rdev
);
2513 clear_bit(Blocked
, &rdev
->flags
);
2514 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2515 wake_up(&rdev
->blocked_wait
);
2516 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2517 md_wakeup_thread(rdev
->mddev
->thread
);
2520 } else if (cmd_match(buf
, "insync") && rdev
->raid_disk
== -1) {
2521 set_bit(In_sync
, &rdev
->flags
);
2523 } else if (cmd_match(buf
, "-insync") && rdev
->raid_disk
>= 0) {
2524 if (rdev
->mddev
->pers
== NULL
) {
2525 clear_bit(In_sync
, &rdev
->flags
);
2526 rdev
->saved_raid_disk
= rdev
->raid_disk
;
2527 rdev
->raid_disk
= -1;
2530 } else if (cmd_match(buf
, "write_error")) {
2531 set_bit(WriteErrorSeen
, &rdev
->flags
);
2533 } else if (cmd_match(buf
, "-write_error")) {
2534 clear_bit(WriteErrorSeen
, &rdev
->flags
);
2536 } else if (cmd_match(buf
, "want_replacement")) {
2537 /* Any non-spare device that is not a replacement can
2538 * become want_replacement at any time, but we then need to
2539 * check if recovery is needed.
2541 if (rdev
->raid_disk
>= 0 &&
2542 !test_bit(Replacement
, &rdev
->flags
))
2543 set_bit(WantReplacement
, &rdev
->flags
);
2544 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2545 md_wakeup_thread(rdev
->mddev
->thread
);
2547 } else if (cmd_match(buf
, "-want_replacement")) {
2548 /* Clearing 'want_replacement' is always allowed.
2549 * Once replacements starts it is too late though.
2552 clear_bit(WantReplacement
, &rdev
->flags
);
2553 } else if (cmd_match(buf
, "replacement")) {
2554 /* Can only set a device as a replacement when array has not
2555 * yet been started. Once running, replacement is automatic
2556 * from spares, or by assigning 'slot'.
2558 if (rdev
->mddev
->pers
)
2561 set_bit(Replacement
, &rdev
->flags
);
2564 } else if (cmd_match(buf
, "-replacement")) {
2565 /* Similarly, can only clear Replacement before start */
2566 if (rdev
->mddev
->pers
)
2569 clear_bit(Replacement
, &rdev
->flags
);
2574 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2575 return err
? err
: len
;
2577 static struct rdev_sysfs_entry rdev_state
=
2578 __ATTR(state
, S_IRUGO
|S_IWUSR
, state_show
, state_store
);
2581 errors_show(struct md_rdev
*rdev
, char *page
)
2583 return sprintf(page
, "%d\n", atomic_read(&rdev
->corrected_errors
));
2587 errors_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2590 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2591 if (*buf
&& (*e
== 0 || *e
== '\n')) {
2592 atomic_set(&rdev
->corrected_errors
, n
);
2597 static struct rdev_sysfs_entry rdev_errors
=
2598 __ATTR(errors
, S_IRUGO
|S_IWUSR
, errors_show
, errors_store
);
2601 slot_show(struct md_rdev
*rdev
, char *page
)
2603 if (rdev
->raid_disk
< 0)
2604 return sprintf(page
, "none\n");
2606 return sprintf(page
, "%d\n", rdev
->raid_disk
);
2610 slot_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2614 int slot
= simple_strtoul(buf
, &e
, 10);
2615 if (strncmp(buf
, "none", 4)==0)
2617 else if (e
==buf
|| (*e
&& *e
!= '\n'))
2619 if (rdev
->mddev
->pers
&& slot
== -1) {
2620 /* Setting 'slot' on an active array requires also
2621 * updating the 'rd%d' link, and communicating
2622 * with the personality with ->hot_*_disk.
2623 * For now we only support removing
2624 * failed/spare devices. This normally happens automatically,
2625 * but not when the metadata is externally managed.
2627 if (rdev
->raid_disk
== -1)
2629 /* personality does all needed checks */
2630 if (rdev
->mddev
->pers
->hot_remove_disk
== NULL
)
2632 clear_bit(Blocked
, &rdev
->flags
);
2633 remove_and_add_spares(rdev
->mddev
, rdev
);
2634 if (rdev
->raid_disk
>= 0)
2636 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2637 md_wakeup_thread(rdev
->mddev
->thread
);
2638 } else if (rdev
->mddev
->pers
) {
2639 /* Activating a spare .. or possibly reactivating
2640 * if we ever get bitmaps working here.
2643 if (rdev
->raid_disk
!= -1)
2646 if (test_bit(MD_RECOVERY_RUNNING
, &rdev
->mddev
->recovery
))
2649 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
2652 if (slot
>= rdev
->mddev
->raid_disks
&&
2653 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
2656 rdev
->raid_disk
= slot
;
2657 if (test_bit(In_sync
, &rdev
->flags
))
2658 rdev
->saved_raid_disk
= slot
;
2660 rdev
->saved_raid_disk
= -1;
2661 clear_bit(In_sync
, &rdev
->flags
);
2662 clear_bit(Bitmap_sync
, &rdev
->flags
);
2663 err
= rdev
->mddev
->pers
->
2664 hot_add_disk(rdev
->mddev
, rdev
);
2666 rdev
->raid_disk
= -1;
2669 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2670 if (sysfs_link_rdev(rdev
->mddev
, rdev
))
2671 /* failure here is OK */;
2672 /* don't wakeup anyone, leave that to userspace. */
2674 if (slot
>= rdev
->mddev
->raid_disks
&&
2675 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
2677 rdev
->raid_disk
= slot
;
2678 /* assume it is working */
2679 clear_bit(Faulty
, &rdev
->flags
);
2680 clear_bit(WriteMostly
, &rdev
->flags
);
2681 set_bit(In_sync
, &rdev
->flags
);
2682 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2687 static struct rdev_sysfs_entry rdev_slot
=
2688 __ATTR(slot
, S_IRUGO
|S_IWUSR
, slot_show
, slot_store
);
2691 offset_show(struct md_rdev
*rdev
, char *page
)
2693 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->data_offset
);
2697 offset_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2699 unsigned long long offset
;
2700 if (kstrtoull(buf
, 10, &offset
) < 0)
2702 if (rdev
->mddev
->pers
&& rdev
->raid_disk
>= 0)
2704 if (rdev
->sectors
&& rdev
->mddev
->external
)
2705 /* Must set offset before size, so overlap checks
2708 rdev
->data_offset
= offset
;
2709 rdev
->new_data_offset
= offset
;
2713 static struct rdev_sysfs_entry rdev_offset
=
2714 __ATTR(offset
, S_IRUGO
|S_IWUSR
, offset_show
, offset_store
);
2716 static ssize_t
new_offset_show(struct md_rdev
*rdev
, char *page
)
2718 return sprintf(page
, "%llu\n",
2719 (unsigned long long)rdev
->new_data_offset
);
2722 static ssize_t
new_offset_store(struct md_rdev
*rdev
,
2723 const char *buf
, size_t len
)
2725 unsigned long long new_offset
;
2726 struct mddev
*mddev
= rdev
->mddev
;
2728 if (kstrtoull(buf
, 10, &new_offset
) < 0)
2731 if (mddev
->sync_thread
||
2732 test_bit(MD_RECOVERY_RUNNING
,&mddev
->recovery
))
2734 if (new_offset
== rdev
->data_offset
)
2735 /* reset is always permitted */
2737 else if (new_offset
> rdev
->data_offset
) {
2738 /* must not push array size beyond rdev_sectors */
2739 if (new_offset
- rdev
->data_offset
2740 + mddev
->dev_sectors
> rdev
->sectors
)
2743 /* Metadata worries about other space details. */
2745 /* decreasing the offset is inconsistent with a backwards
2748 if (new_offset
< rdev
->data_offset
&&
2749 mddev
->reshape_backwards
)
2751 /* Increasing offset is inconsistent with forwards
2752 * reshape. reshape_direction should be set to
2753 * 'backwards' first.
2755 if (new_offset
> rdev
->data_offset
&&
2756 !mddev
->reshape_backwards
)
2759 if (mddev
->pers
&& mddev
->persistent
&&
2760 !super_types
[mddev
->major_version
]
2761 .allow_new_offset(rdev
, new_offset
))
2763 rdev
->new_data_offset
= new_offset
;
2764 if (new_offset
> rdev
->data_offset
)
2765 mddev
->reshape_backwards
= 1;
2766 else if (new_offset
< rdev
->data_offset
)
2767 mddev
->reshape_backwards
= 0;
2771 static struct rdev_sysfs_entry rdev_new_offset
=
2772 __ATTR(new_offset
, S_IRUGO
|S_IWUSR
, new_offset_show
, new_offset_store
);
2775 rdev_size_show(struct md_rdev
*rdev
, char *page
)
2777 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->sectors
/ 2);
2780 static int overlaps(sector_t s1
, sector_t l1
, sector_t s2
, sector_t l2
)
2782 /* check if two start/length pairs overlap */
2790 static int strict_blocks_to_sectors(const char *buf
, sector_t
*sectors
)
2792 unsigned long long blocks
;
2795 if (kstrtoull(buf
, 10, &blocks
) < 0)
2798 if (blocks
& 1ULL << (8 * sizeof(blocks
) - 1))
2799 return -EINVAL
; /* sector conversion overflow */
2802 if (new != blocks
* 2)
2803 return -EINVAL
; /* unsigned long long to sector_t overflow */
2810 rdev_size_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2812 struct mddev
*my_mddev
= rdev
->mddev
;
2813 sector_t oldsectors
= rdev
->sectors
;
2816 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
2818 if (rdev
->data_offset
!= rdev
->new_data_offset
)
2819 return -EINVAL
; /* too confusing */
2820 if (my_mddev
->pers
&& rdev
->raid_disk
>= 0) {
2821 if (my_mddev
->persistent
) {
2822 sectors
= super_types
[my_mddev
->major_version
].
2823 rdev_size_change(rdev
, sectors
);
2826 } else if (!sectors
)
2827 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) -
2829 if (!my_mddev
->pers
->resize
)
2830 /* Cannot change size for RAID0 or Linear etc */
2833 if (sectors
< my_mddev
->dev_sectors
)
2834 return -EINVAL
; /* component must fit device */
2836 rdev
->sectors
= sectors
;
2837 if (sectors
> oldsectors
&& my_mddev
->external
) {
2838 /* Need to check that all other rdevs with the same
2839 * ->bdev do not overlap. 'rcu' is sufficient to walk
2840 * the rdev lists safely.
2841 * This check does not provide a hard guarantee, it
2842 * just helps avoid dangerous mistakes.
2844 struct mddev
*mddev
;
2846 struct list_head
*tmp
;
2849 for_each_mddev(mddev
, tmp
) {
2850 struct md_rdev
*rdev2
;
2852 rdev_for_each(rdev2
, mddev
)
2853 if (rdev
->bdev
== rdev2
->bdev
&&
2855 overlaps(rdev
->data_offset
, rdev
->sectors
,
2868 /* Someone else could have slipped in a size
2869 * change here, but doing so is just silly.
2870 * We put oldsectors back because we *know* it is
2871 * safe, and trust userspace not to race with
2874 rdev
->sectors
= oldsectors
;
2881 static struct rdev_sysfs_entry rdev_size
=
2882 __ATTR(size
, S_IRUGO
|S_IWUSR
, rdev_size_show
, rdev_size_store
);
2884 static ssize_t
recovery_start_show(struct md_rdev
*rdev
, char *page
)
2886 unsigned long long recovery_start
= rdev
->recovery_offset
;
2888 if (test_bit(In_sync
, &rdev
->flags
) ||
2889 recovery_start
== MaxSector
)
2890 return sprintf(page
, "none\n");
2892 return sprintf(page
, "%llu\n", recovery_start
);
2895 static ssize_t
recovery_start_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2897 unsigned long long recovery_start
;
2899 if (cmd_match(buf
, "none"))
2900 recovery_start
= MaxSector
;
2901 else if (kstrtoull(buf
, 10, &recovery_start
))
2904 if (rdev
->mddev
->pers
&&
2905 rdev
->raid_disk
>= 0)
2908 rdev
->recovery_offset
= recovery_start
;
2909 if (recovery_start
== MaxSector
)
2910 set_bit(In_sync
, &rdev
->flags
);
2912 clear_bit(In_sync
, &rdev
->flags
);
2916 static struct rdev_sysfs_entry rdev_recovery_start
=
2917 __ATTR(recovery_start
, S_IRUGO
|S_IWUSR
, recovery_start_show
, recovery_start_store
);
2920 badblocks_show(struct badblocks
*bb
, char *page
, int unack
);
2922 badblocks_store(struct badblocks
*bb
, const char *page
, size_t len
, int unack
);
2924 static ssize_t
bb_show(struct md_rdev
*rdev
, char *page
)
2926 return badblocks_show(&rdev
->badblocks
, page
, 0);
2928 static ssize_t
bb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
2930 int rv
= badblocks_store(&rdev
->badblocks
, page
, len
, 0);
2931 /* Maybe that ack was all we needed */
2932 if (test_and_clear_bit(BlockedBadBlocks
, &rdev
->flags
))
2933 wake_up(&rdev
->blocked_wait
);
2936 static struct rdev_sysfs_entry rdev_bad_blocks
=
2937 __ATTR(bad_blocks
, S_IRUGO
|S_IWUSR
, bb_show
, bb_store
);
2939 static ssize_t
ubb_show(struct md_rdev
*rdev
, char *page
)
2941 return badblocks_show(&rdev
->badblocks
, page
, 1);
2943 static ssize_t
ubb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
2945 return badblocks_store(&rdev
->badblocks
, page
, len
, 1);
2947 static struct rdev_sysfs_entry rdev_unack_bad_blocks
=
2948 __ATTR(unacknowledged_bad_blocks
, S_IRUGO
|S_IWUSR
, ubb_show
, ubb_store
);
2950 static struct attribute
*rdev_default_attrs
[] = {
2955 &rdev_new_offset
.attr
,
2957 &rdev_recovery_start
.attr
,
2958 &rdev_bad_blocks
.attr
,
2959 &rdev_unack_bad_blocks
.attr
,
2963 rdev_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
2965 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
2966 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
2967 struct mddev
*mddev
= rdev
->mddev
;
2973 rv
= mddev
? mddev_lock(mddev
) : -EBUSY
;
2975 if (rdev
->mddev
== NULL
)
2978 rv
= entry
->show(rdev
, page
);
2979 mddev_unlock(mddev
);
2985 rdev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
2986 const char *page
, size_t length
)
2988 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
2989 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
2991 struct mddev
*mddev
= rdev
->mddev
;
2995 if (!capable(CAP_SYS_ADMIN
))
2997 rv
= mddev
? mddev_lock(mddev
): -EBUSY
;
2999 if (rdev
->mddev
== NULL
)
3002 rv
= entry
->store(rdev
, page
, length
);
3003 mddev_unlock(mddev
);
3008 static void rdev_free(struct kobject
*ko
)
3010 struct md_rdev
*rdev
= container_of(ko
, struct md_rdev
, kobj
);
3013 static const struct sysfs_ops rdev_sysfs_ops
= {
3014 .show
= rdev_attr_show
,
3015 .store
= rdev_attr_store
,
3017 static struct kobj_type rdev_ktype
= {
3018 .release
= rdev_free
,
3019 .sysfs_ops
= &rdev_sysfs_ops
,
3020 .default_attrs
= rdev_default_attrs
,
3023 int md_rdev_init(struct md_rdev
*rdev
)
3026 rdev
->saved_raid_disk
= -1;
3027 rdev
->raid_disk
= -1;
3029 rdev
->data_offset
= 0;
3030 rdev
->new_data_offset
= 0;
3031 rdev
->sb_events
= 0;
3032 rdev
->last_read_error
.tv_sec
= 0;
3033 rdev
->last_read_error
.tv_nsec
= 0;
3034 rdev
->sb_loaded
= 0;
3035 rdev
->bb_page
= NULL
;
3036 atomic_set(&rdev
->nr_pending
, 0);
3037 atomic_set(&rdev
->read_errors
, 0);
3038 atomic_set(&rdev
->corrected_errors
, 0);
3040 INIT_LIST_HEAD(&rdev
->same_set
);
3041 init_waitqueue_head(&rdev
->blocked_wait
);
3043 /* Add space to store bad block list.
3044 * This reserves the space even on arrays where it cannot
3045 * be used - I wonder if that matters
3047 rdev
->badblocks
.count
= 0;
3048 rdev
->badblocks
.shift
= -1; /* disabled until explicitly enabled */
3049 rdev
->badblocks
.page
= kmalloc(PAGE_SIZE
, GFP_KERNEL
);
3050 seqlock_init(&rdev
->badblocks
.lock
);
3051 if (rdev
->badblocks
.page
== NULL
)
3056 EXPORT_SYMBOL_GPL(md_rdev_init
);
3058 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3060 * mark the device faulty if:
3062 * - the device is nonexistent (zero size)
3063 * - the device has no valid superblock
3065 * a faulty rdev _never_ has rdev->sb set.
3067 static struct md_rdev
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
3069 char b
[BDEVNAME_SIZE
];
3071 struct md_rdev
*rdev
;
3074 rdev
= kzalloc(sizeof(*rdev
), GFP_KERNEL
);
3076 printk(KERN_ERR
"md: could not alloc mem for new device!\n");
3077 return ERR_PTR(-ENOMEM
);
3080 err
= md_rdev_init(rdev
);
3083 err
= alloc_disk_sb(rdev
);
3087 err
= lock_rdev(rdev
, newdev
, super_format
== -2);
3091 kobject_init(&rdev
->kobj
, &rdev_ktype
);
3093 size
= i_size_read(rdev
->bdev
->bd_inode
) >> BLOCK_SIZE_BITS
;
3096 "md: %s has zero or unknown size, marking faulty!\n",
3097 bdevname(rdev
->bdev
,b
));
3102 if (super_format
>= 0) {
3103 err
= super_types
[super_format
].
3104 load_super(rdev
, NULL
, super_minor
);
3105 if (err
== -EINVAL
) {
3107 "md: %s does not have a valid v%d.%d "
3108 "superblock, not importing!\n",
3109 bdevname(rdev
->bdev
,b
),
3110 super_format
, super_minor
);
3115 "md: could not read %s's sb, not importing!\n",
3116 bdevname(rdev
->bdev
,b
));
3126 md_rdev_clear(rdev
);
3128 return ERR_PTR(err
);
3132 * Check a full RAID array for plausibility
3135 static void analyze_sbs(struct mddev
*mddev
)
3138 struct md_rdev
*rdev
, *freshest
, *tmp
;
3139 char b
[BDEVNAME_SIZE
];
3142 rdev_for_each_safe(rdev
, tmp
, mddev
)
3143 switch (super_types
[mddev
->major_version
].
3144 load_super(rdev
, freshest
, mddev
->minor_version
)) {
3152 "md: fatal superblock inconsistency in %s"
3153 " -- removing from array\n",
3154 bdevname(rdev
->bdev
,b
));
3155 kick_rdev_from_array(rdev
);
3158 super_types
[mddev
->major_version
].
3159 validate_super(mddev
, freshest
);
3162 rdev_for_each_safe(rdev
, tmp
, mddev
) {
3163 if (mddev
->max_disks
&&
3164 (rdev
->desc_nr
>= mddev
->max_disks
||
3165 i
> mddev
->max_disks
)) {
3167 "md: %s: %s: only %d devices permitted\n",
3168 mdname(mddev
), bdevname(rdev
->bdev
, b
),
3170 kick_rdev_from_array(rdev
);
3173 if (rdev
!= freshest
)
3174 if (super_types
[mddev
->major_version
].
3175 validate_super(mddev
, rdev
)) {
3176 printk(KERN_WARNING
"md: kicking non-fresh %s"
3178 bdevname(rdev
->bdev
,b
));
3179 kick_rdev_from_array(rdev
);
3182 if (mddev
->level
== LEVEL_MULTIPATH
) {
3183 rdev
->desc_nr
= i
++;
3184 rdev
->raid_disk
= rdev
->desc_nr
;
3185 set_bit(In_sync
, &rdev
->flags
);
3186 } else if (rdev
->raid_disk
>= (mddev
->raid_disks
- min(0, mddev
->delta_disks
))) {
3187 rdev
->raid_disk
= -1;
3188 clear_bit(In_sync
, &rdev
->flags
);
3193 /* Read a fixed-point number.
3194 * Numbers in sysfs attributes should be in "standard" units where
3195 * possible, so time should be in seconds.
3196 * However we internally use a a much smaller unit such as
3197 * milliseconds or jiffies.
3198 * This function takes a decimal number with a possible fractional
3199 * component, and produces an integer which is the result of
3200 * multiplying that number by 10^'scale'.
3201 * all without any floating-point arithmetic.
3203 int strict_strtoul_scaled(const char *cp
, unsigned long *res
, int scale
)
3205 unsigned long result
= 0;
3207 while (isdigit(*cp
) || (*cp
== '.' && decimals
< 0)) {
3210 else if (decimals
< scale
) {
3213 result
= result
* 10 + value
;
3225 while (decimals
< scale
) {
3233 static void md_safemode_timeout(unsigned long data
);
3236 safe_delay_show(struct mddev
*mddev
, char *page
)
3238 int msec
= (mddev
->safemode_delay
*1000)/HZ
;
3239 return sprintf(page
, "%d.%03d\n", msec
/1000, msec
%1000);
3242 safe_delay_store(struct mddev
*mddev
, const char *cbuf
, size_t len
)
3246 if (strict_strtoul_scaled(cbuf
, &msec
, 3) < 0)
3249 mddev
->safemode_delay
= 0;
3251 unsigned long old_delay
= mddev
->safemode_delay
;
3252 mddev
->safemode_delay
= (msec
*HZ
)/1000;
3253 if (mddev
->safemode_delay
== 0)
3254 mddev
->safemode_delay
= 1;
3255 if (mddev
->safemode_delay
< old_delay
|| old_delay
== 0)
3256 md_safemode_timeout((unsigned long)mddev
);
3260 static struct md_sysfs_entry md_safe_delay
=
3261 __ATTR(safe_mode_delay
, S_IRUGO
|S_IWUSR
,safe_delay_show
, safe_delay_store
);
3264 level_show(struct mddev
*mddev
, char *page
)
3266 struct md_personality
*p
= mddev
->pers
;
3268 return sprintf(page
, "%s\n", p
->name
);
3269 else if (mddev
->clevel
[0])
3270 return sprintf(page
, "%s\n", mddev
->clevel
);
3271 else if (mddev
->level
!= LEVEL_NONE
)
3272 return sprintf(page
, "%d\n", mddev
->level
);
3278 level_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3282 struct md_personality
*pers
;
3285 struct md_rdev
*rdev
;
3287 if (mddev
->pers
== NULL
) {
3290 if (len
>= sizeof(mddev
->clevel
))
3292 strncpy(mddev
->clevel
, buf
, len
);
3293 if (mddev
->clevel
[len
-1] == '\n')
3295 mddev
->clevel
[len
] = 0;
3296 mddev
->level
= LEVEL_NONE
;
3302 /* request to change the personality. Need to ensure:
3303 * - array is not engaged in resync/recovery/reshape
3304 * - old personality can be suspended
3305 * - new personality will access other array.
3308 if (mddev
->sync_thread
||
3309 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
3310 mddev
->reshape_position
!= MaxSector
||
3311 mddev
->sysfs_active
)
3314 if (!mddev
->pers
->quiesce
) {
3315 printk(KERN_WARNING
"md: %s: %s does not support online personality change\n",
3316 mdname(mddev
), mddev
->pers
->name
);
3320 /* Now find the new personality */
3321 if (len
== 0 || len
>= sizeof(clevel
))
3323 strncpy(clevel
, buf
, len
);
3324 if (clevel
[len
-1] == '\n')
3327 if (kstrtol(clevel
, 10, &level
))
3330 if (request_module("md-%s", clevel
) != 0)
3331 request_module("md-level-%s", clevel
);
3332 spin_lock(&pers_lock
);
3333 pers
= find_pers(level
, clevel
);
3334 if (!pers
|| !try_module_get(pers
->owner
)) {
3335 spin_unlock(&pers_lock
);
3336 printk(KERN_WARNING
"md: personality %s not loaded\n", clevel
);
3339 spin_unlock(&pers_lock
);
3341 if (pers
== mddev
->pers
) {
3342 /* Nothing to do! */
3343 module_put(pers
->owner
);
3346 if (!pers
->takeover
) {
3347 module_put(pers
->owner
);
3348 printk(KERN_WARNING
"md: %s: %s does not support personality takeover\n",
3349 mdname(mddev
), clevel
);
3353 rdev_for_each(rdev
, mddev
)
3354 rdev
->new_raid_disk
= rdev
->raid_disk
;
3356 /* ->takeover must set new_* and/or delta_disks
3357 * if it succeeds, and may set them when it fails.
3359 priv
= pers
->takeover(mddev
);
3361 mddev
->new_level
= mddev
->level
;
3362 mddev
->new_layout
= mddev
->layout
;
3363 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3364 mddev
->raid_disks
-= mddev
->delta_disks
;
3365 mddev
->delta_disks
= 0;
3366 mddev
->reshape_backwards
= 0;
3367 module_put(pers
->owner
);
3368 printk(KERN_WARNING
"md: %s: %s would not accept array\n",
3369 mdname(mddev
), clevel
);
3370 return PTR_ERR(priv
);
3373 /* Looks like we have a winner */
3374 mddev_suspend(mddev
);
3375 mddev
->pers
->stop(mddev
);
3377 if (mddev
->pers
->sync_request
== NULL
&&
3378 pers
->sync_request
!= NULL
) {
3379 /* need to add the md_redundancy_group */
3380 if (sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
3382 "md: cannot register extra attributes for %s\n",
3384 mddev
->sysfs_action
= sysfs_get_dirent(mddev
->kobj
.sd
, "sync_action");
3386 if (mddev
->pers
->sync_request
!= NULL
&&
3387 pers
->sync_request
== NULL
) {
3388 /* need to remove the md_redundancy_group */
3389 if (mddev
->to_remove
== NULL
)
3390 mddev
->to_remove
= &md_redundancy_group
;
3393 if (mddev
->pers
->sync_request
== NULL
&&
3395 /* We are converting from a no-redundancy array
3396 * to a redundancy array and metadata is managed
3397 * externally so we need to be sure that writes
3398 * won't block due to a need to transition
3400 * until external management is started.
3403 mddev
->safemode_delay
= 0;
3404 mddev
->safemode
= 0;
3407 rdev_for_each(rdev
, mddev
) {
3408 if (rdev
->raid_disk
< 0)
3410 if (rdev
->new_raid_disk
>= mddev
->raid_disks
)
3411 rdev
->new_raid_disk
= -1;
3412 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3414 sysfs_unlink_rdev(mddev
, rdev
);
3416 rdev_for_each(rdev
, mddev
) {
3417 if (rdev
->raid_disk
< 0)
3419 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3421 rdev
->raid_disk
= rdev
->new_raid_disk
;
3422 if (rdev
->raid_disk
< 0)
3423 clear_bit(In_sync
, &rdev
->flags
);
3425 if (sysfs_link_rdev(mddev
, rdev
))
3426 printk(KERN_WARNING
"md: cannot register rd%d"
3427 " for %s after level change\n",
3428 rdev
->raid_disk
, mdname(mddev
));
3432 module_put(mddev
->pers
->owner
);
3434 mddev
->private = priv
;
3435 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
3436 mddev
->level
= mddev
->new_level
;
3437 mddev
->layout
= mddev
->new_layout
;
3438 mddev
->chunk_sectors
= mddev
->new_chunk_sectors
;
3439 mddev
->delta_disks
= 0;
3440 mddev
->reshape_backwards
= 0;
3441 mddev
->degraded
= 0;
3442 if (mddev
->pers
->sync_request
== NULL
) {
3443 /* this is now an array without redundancy, so
3444 * it must always be in_sync
3447 del_timer_sync(&mddev
->safemode_timer
);
3449 blk_set_stacking_limits(&mddev
->queue
->limits
);
3451 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
3452 mddev_resume(mddev
);
3454 md_update_sb(mddev
, 1);
3455 sysfs_notify(&mddev
->kobj
, NULL
, "level");
3456 md_new_event(mddev
);
3460 static struct md_sysfs_entry md_level
=
3461 __ATTR(level
, S_IRUGO
|S_IWUSR
, level_show
, level_store
);
3464 layout_show(struct mddev
*mddev
, char *page
)
3466 /* just a number, not meaningful for all levels */
3467 if (mddev
->reshape_position
!= MaxSector
&&
3468 mddev
->layout
!= mddev
->new_layout
)
3469 return sprintf(page
, "%d (%d)\n",
3470 mddev
->new_layout
, mddev
->layout
);
3471 return sprintf(page
, "%d\n", mddev
->layout
);
3475 layout_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3478 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3480 if (!*buf
|| (*e
&& *e
!= '\n'))
3485 if (mddev
->pers
->check_reshape
== NULL
)
3489 mddev
->new_layout
= n
;
3490 err
= mddev
->pers
->check_reshape(mddev
);
3492 mddev
->new_layout
= mddev
->layout
;
3496 mddev
->new_layout
= n
;
3497 if (mddev
->reshape_position
== MaxSector
)
3502 static struct md_sysfs_entry md_layout
=
3503 __ATTR(layout
, S_IRUGO
|S_IWUSR
, layout_show
, layout_store
);
3506 raid_disks_show(struct mddev
*mddev
, char *page
)
3508 if (mddev
->raid_disks
== 0)
3510 if (mddev
->reshape_position
!= MaxSector
&&
3511 mddev
->delta_disks
!= 0)
3512 return sprintf(page
, "%d (%d)\n", mddev
->raid_disks
,
3513 mddev
->raid_disks
- mddev
->delta_disks
);
3514 return sprintf(page
, "%d\n", mddev
->raid_disks
);
3517 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
);
3520 raid_disks_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3524 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3526 if (!*buf
|| (*e
&& *e
!= '\n'))
3530 rv
= update_raid_disks(mddev
, n
);
3531 else if (mddev
->reshape_position
!= MaxSector
) {
3532 struct md_rdev
*rdev
;
3533 int olddisks
= mddev
->raid_disks
- mddev
->delta_disks
;
3535 rdev_for_each(rdev
, mddev
) {
3537 rdev
->data_offset
< rdev
->new_data_offset
)
3540 rdev
->data_offset
> rdev
->new_data_offset
)
3543 mddev
->delta_disks
= n
- olddisks
;
3544 mddev
->raid_disks
= n
;
3545 mddev
->reshape_backwards
= (mddev
->delta_disks
< 0);
3547 mddev
->raid_disks
= n
;
3548 return rv
? rv
: len
;
3550 static struct md_sysfs_entry md_raid_disks
=
3551 __ATTR(raid_disks
, S_IRUGO
|S_IWUSR
, raid_disks_show
, raid_disks_store
);
3554 chunk_size_show(struct mddev
*mddev
, char *page
)
3556 if (mddev
->reshape_position
!= MaxSector
&&
3557 mddev
->chunk_sectors
!= mddev
->new_chunk_sectors
)
3558 return sprintf(page
, "%d (%d)\n",
3559 mddev
->new_chunk_sectors
<< 9,
3560 mddev
->chunk_sectors
<< 9);
3561 return sprintf(page
, "%d\n", mddev
->chunk_sectors
<< 9);
3565 chunk_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3568 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3570 if (!*buf
|| (*e
&& *e
!= '\n'))
3575 if (mddev
->pers
->check_reshape
== NULL
)
3579 mddev
->new_chunk_sectors
= n
>> 9;
3580 err
= mddev
->pers
->check_reshape(mddev
);
3582 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3586 mddev
->new_chunk_sectors
= n
>> 9;
3587 if (mddev
->reshape_position
== MaxSector
)
3588 mddev
->chunk_sectors
= n
>> 9;
3592 static struct md_sysfs_entry md_chunk_size
=
3593 __ATTR(chunk_size
, S_IRUGO
|S_IWUSR
, chunk_size_show
, chunk_size_store
);
3596 resync_start_show(struct mddev
*mddev
, char *page
)
3598 if (mddev
->recovery_cp
== MaxSector
)
3599 return sprintf(page
, "none\n");
3600 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->recovery_cp
);
3604 resync_start_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3607 unsigned long long n
= simple_strtoull(buf
, &e
, 10);
3609 if (mddev
->pers
&& !test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
3611 if (cmd_match(buf
, "none"))
3613 else if (!*buf
|| (*e
&& *e
!= '\n'))
3616 mddev
->recovery_cp
= n
;
3618 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
3621 static struct md_sysfs_entry md_resync_start
=
3622 __ATTR(resync_start
, S_IRUGO
|S_IWUSR
, resync_start_show
, resync_start_store
);
3625 * The array state can be:
3628 * No devices, no size, no level
3629 * Equivalent to STOP_ARRAY ioctl
3631 * May have some settings, but array is not active
3632 * all IO results in error
3633 * When written, doesn't tear down array, but just stops it
3634 * suspended (not supported yet)
3635 * All IO requests will block. The array can be reconfigured.
3636 * Writing this, if accepted, will block until array is quiescent
3638 * no resync can happen. no superblocks get written.
3639 * write requests fail
3641 * like readonly, but behaves like 'clean' on a write request.
3643 * clean - no pending writes, but otherwise active.
3644 * When written to inactive array, starts without resync
3645 * If a write request arrives then
3646 * if metadata is known, mark 'dirty' and switch to 'active'.
3647 * if not known, block and switch to write-pending
3648 * If written to an active array that has pending writes, then fails.
3650 * fully active: IO and resync can be happening.
3651 * When written to inactive array, starts with resync
3654 * clean, but writes are blocked waiting for 'active' to be written.
3657 * like active, but no writes have been seen for a while (100msec).
3660 enum array_state
{ clear
, inactive
, suspended
, readonly
, read_auto
, clean
, active
,
3661 write_pending
, active_idle
, bad_word
};
3662 static char *array_states
[] = {
3663 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3664 "write-pending", "active-idle", NULL
};
3666 static int match_word(const char *word
, char **list
)
3669 for (n
=0; list
[n
]; n
++)
3670 if (cmd_match(word
, list
[n
]))
3676 array_state_show(struct mddev
*mddev
, char *page
)
3678 enum array_state st
= inactive
;
3691 else if (test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
3693 else if (mddev
->safemode
)
3699 if (list_empty(&mddev
->disks
) &&
3700 mddev
->raid_disks
== 0 &&
3701 mddev
->dev_sectors
== 0)
3706 return sprintf(page
, "%s\n", array_states
[st
]);
3709 static int do_md_stop(struct mddev
*mddev
, int ro
, struct block_device
*bdev
);
3710 static int md_set_readonly(struct mddev
*mddev
, struct block_device
*bdev
);
3711 static int do_md_run(struct mddev
*mddev
);
3712 static int restart_array(struct mddev
*mddev
);
3715 array_state_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3718 enum array_state st
= match_word(buf
, array_states
);
3723 /* stopping an active array */
3724 err
= do_md_stop(mddev
, 0, NULL
);
3727 /* stopping an active array */
3729 err
= do_md_stop(mddev
, 2, NULL
);
3731 err
= 0; /* already inactive */
3734 break; /* not supported yet */
3737 err
= md_set_readonly(mddev
, NULL
);
3740 set_disk_ro(mddev
->gendisk
, 1);
3741 err
= do_md_run(mddev
);
3747 err
= md_set_readonly(mddev
, NULL
);
3748 else if (mddev
->ro
== 1)
3749 err
= restart_array(mddev
);
3752 set_disk_ro(mddev
->gendisk
, 0);
3756 err
= do_md_run(mddev
);
3761 restart_array(mddev
);
3762 spin_lock(&mddev
->lock
);
3763 if (atomic_read(&mddev
->writes_pending
) == 0) {
3764 if (mddev
->in_sync
== 0) {
3766 if (mddev
->safemode
== 1)
3767 mddev
->safemode
= 0;
3768 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
3773 spin_unlock(&mddev
->lock
);
3779 restart_array(mddev
);
3780 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
3781 wake_up(&mddev
->sb_wait
);
3785 set_disk_ro(mddev
->gendisk
, 0);
3786 err
= do_md_run(mddev
);
3791 /* these cannot be set */
3797 if (mddev
->hold_active
== UNTIL_IOCTL
)
3798 mddev
->hold_active
= 0;
3799 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
3803 static struct md_sysfs_entry md_array_state
=
3804 __ATTR(array_state
, S_IRUGO
|S_IWUSR
, array_state_show
, array_state_store
);
3807 max_corrected_read_errors_show(struct mddev
*mddev
, char *page
) {
3808 return sprintf(page
, "%d\n",
3809 atomic_read(&mddev
->max_corr_read_errors
));
3813 max_corrected_read_errors_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3816 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3818 if (*buf
&& (*e
== 0 || *e
== '\n')) {
3819 atomic_set(&mddev
->max_corr_read_errors
, n
);
3825 static struct md_sysfs_entry max_corr_read_errors
=
3826 __ATTR(max_read_errors
, S_IRUGO
|S_IWUSR
, max_corrected_read_errors_show
,
3827 max_corrected_read_errors_store
);
3830 null_show(struct mddev
*mddev
, char *page
)
3836 new_dev_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3838 /* buf must be %d:%d\n? giving major and minor numbers */
3839 /* The new device is added to the array.
3840 * If the array has a persistent superblock, we read the
3841 * superblock to initialise info and check validity.
3842 * Otherwise, only checking done is that in bind_rdev_to_array,
3843 * which mainly checks size.
3846 int major
= simple_strtoul(buf
, &e
, 10);
3849 struct md_rdev
*rdev
;
3852 if (!*buf
|| *e
!= ':' || !e
[1] || e
[1] == '\n')
3854 minor
= simple_strtoul(e
+1, &e
, 10);
3855 if (*e
&& *e
!= '\n')
3857 dev
= MKDEV(major
, minor
);
3858 if (major
!= MAJOR(dev
) ||
3859 minor
!= MINOR(dev
))
3862 if (mddev
->persistent
) {
3863 rdev
= md_import_device(dev
, mddev
->major_version
,
3864 mddev
->minor_version
);
3865 if (!IS_ERR(rdev
) && !list_empty(&mddev
->disks
)) {
3866 struct md_rdev
*rdev0
3867 = list_entry(mddev
->disks
.next
,
3868 struct md_rdev
, same_set
);
3869 err
= super_types
[mddev
->major_version
]
3870 .load_super(rdev
, rdev0
, mddev
->minor_version
);
3874 } else if (mddev
->external
)
3875 rdev
= md_import_device(dev
, -2, -1);
3877 rdev
= md_import_device(dev
, -1, -1);
3880 return PTR_ERR(rdev
);
3881 err
= bind_rdev_to_array(rdev
, mddev
);
3885 return err
? err
: len
;
3888 static struct md_sysfs_entry md_new_device
=
3889 __ATTR(new_dev
, S_IWUSR
, null_show
, new_dev_store
);
3892 bitmap_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3895 unsigned long chunk
, end_chunk
;
3899 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
3901 chunk
= end_chunk
= simple_strtoul(buf
, &end
, 0);
3902 if (buf
== end
) break;
3903 if (*end
== '-') { /* range */
3905 end_chunk
= simple_strtoul(buf
, &end
, 0);
3906 if (buf
== end
) break;
3908 if (*end
&& !isspace(*end
)) break;
3909 bitmap_dirty_bits(mddev
->bitmap
, chunk
, end_chunk
);
3910 buf
= skip_spaces(end
);
3912 bitmap_unplug(mddev
->bitmap
); /* flush the bits to disk */
3917 static struct md_sysfs_entry md_bitmap
=
3918 __ATTR(bitmap_set_bits
, S_IWUSR
, null_show
, bitmap_store
);
3921 size_show(struct mddev
*mddev
, char *page
)
3923 return sprintf(page
, "%llu\n",
3924 (unsigned long long)mddev
->dev_sectors
/ 2);
3927 static int update_size(struct mddev
*mddev
, sector_t num_sectors
);
3930 size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3932 /* If array is inactive, we can reduce the component size, but
3933 * not increase it (except from 0).
3934 * If array is active, we can try an on-line resize
3937 int err
= strict_blocks_to_sectors(buf
, §ors
);
3942 err
= update_size(mddev
, sectors
);
3943 md_update_sb(mddev
, 1);
3945 if (mddev
->dev_sectors
== 0 ||
3946 mddev
->dev_sectors
> sectors
)
3947 mddev
->dev_sectors
= sectors
;
3951 return err
? err
: len
;
3954 static struct md_sysfs_entry md_size
=
3955 __ATTR(component_size
, S_IRUGO
|S_IWUSR
, size_show
, size_store
);
3957 /* Metadata version.
3959 * 'none' for arrays with no metadata (good luck...)
3960 * 'external' for arrays with externally managed metadata,
3961 * or N.M for internally known formats
3964 metadata_show(struct mddev
*mddev
, char *page
)
3966 if (mddev
->persistent
)
3967 return sprintf(page
, "%d.%d\n",
3968 mddev
->major_version
, mddev
->minor_version
);
3969 else if (mddev
->external
)
3970 return sprintf(page
, "external:%s\n", mddev
->metadata_type
);
3972 return sprintf(page
, "none\n");
3976 metadata_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3980 /* Changing the details of 'external' metadata is
3981 * always permitted. Otherwise there must be
3982 * no devices attached to the array.
3984 if (mddev
->external
&& strncmp(buf
, "external:", 9) == 0)
3986 else if (!list_empty(&mddev
->disks
))
3989 if (cmd_match(buf
, "none")) {
3990 mddev
->persistent
= 0;
3991 mddev
->external
= 0;
3992 mddev
->major_version
= 0;
3993 mddev
->minor_version
= 90;
3996 if (strncmp(buf
, "external:", 9) == 0) {
3997 size_t namelen
= len
-9;
3998 if (namelen
>= sizeof(mddev
->metadata_type
))
3999 namelen
= sizeof(mddev
->metadata_type
)-1;
4000 strncpy(mddev
->metadata_type
, buf
+9, namelen
);
4001 mddev
->metadata_type
[namelen
] = 0;
4002 if (namelen
&& mddev
->metadata_type
[namelen
-1] == '\n')
4003 mddev
->metadata_type
[--namelen
] = 0;
4004 mddev
->persistent
= 0;
4005 mddev
->external
= 1;
4006 mddev
->major_version
= 0;
4007 mddev
->minor_version
= 90;
4010 major
= simple_strtoul(buf
, &e
, 10);
4011 if (e
==buf
|| *e
!= '.')
4014 minor
= simple_strtoul(buf
, &e
, 10);
4015 if (e
==buf
|| (*e
&& *e
!= '\n') )
4017 if (major
>= ARRAY_SIZE(super_types
) || super_types
[major
].name
== NULL
)
4019 mddev
->major_version
= major
;
4020 mddev
->minor_version
= minor
;
4021 mddev
->persistent
= 1;
4022 mddev
->external
= 0;
4026 static struct md_sysfs_entry md_metadata
=
4027 __ATTR(metadata_version
, S_IRUGO
|S_IWUSR
, metadata_show
, metadata_store
);
4030 action_show(struct mddev
*mddev
, char *page
)
4032 char *type
= "idle";
4033 if (test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
4035 else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
4036 (!mddev
->ro
&& test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))) {
4037 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
4039 else if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
4040 if (!test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
4042 else if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
4046 } else if (test_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
))
4049 return sprintf(page
, "%s\n", type
);
4053 action_store(struct mddev
*mddev
, const char *page
, size_t len
)
4055 if (!mddev
->pers
|| !mddev
->pers
->sync_request
)
4058 if (cmd_match(page
, "frozen"))
4059 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4061 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4063 if (cmd_match(page
, "idle") || cmd_match(page
, "frozen")) {
4064 flush_workqueue(md_misc_wq
);
4065 if (mddev
->sync_thread
) {
4066 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4067 md_reap_sync_thread(mddev
);
4069 } else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
4070 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
4072 else if (cmd_match(page
, "resync"))
4073 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4074 else if (cmd_match(page
, "recover")) {
4075 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
4076 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4077 } else if (cmd_match(page
, "reshape")) {
4079 if (mddev
->pers
->start_reshape
== NULL
)
4081 err
= mddev
->pers
->start_reshape(mddev
);
4084 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
4086 if (cmd_match(page
, "check"))
4087 set_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
4088 else if (!cmd_match(page
, "repair"))
4090 set_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
4091 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
4093 if (mddev
->ro
== 2) {
4094 /* A write to sync_action is enough to justify
4095 * canceling read-auto mode
4098 md_wakeup_thread(mddev
->sync_thread
);
4100 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4101 md_wakeup_thread(mddev
->thread
);
4102 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
4106 static struct md_sysfs_entry md_scan_mode
=
4107 __ATTR(sync_action
, S_IRUGO
|S_IWUSR
, action_show
, action_store
);
4110 last_sync_action_show(struct mddev
*mddev
, char *page
)
4112 return sprintf(page
, "%s\n", mddev
->last_sync_action
);
4115 static struct md_sysfs_entry md_last_scan_mode
= __ATTR_RO(last_sync_action
);
4118 mismatch_cnt_show(struct mddev
*mddev
, char *page
)
4120 return sprintf(page
, "%llu\n",
4121 (unsigned long long)
4122 atomic64_read(&mddev
->resync_mismatches
));
4125 static struct md_sysfs_entry md_mismatches
= __ATTR_RO(mismatch_cnt
);
4128 sync_min_show(struct mddev
*mddev
, char *page
)
4130 return sprintf(page
, "%d (%s)\n", speed_min(mddev
),
4131 mddev
->sync_speed_min
? "local": "system");
4135 sync_min_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4139 if (strncmp(buf
, "system", 6)==0) {
4140 mddev
->sync_speed_min
= 0;
4143 min
= simple_strtoul(buf
, &e
, 10);
4144 if (buf
== e
|| (*e
&& *e
!= '\n') || min
<= 0)
4146 mddev
->sync_speed_min
= min
;
4150 static struct md_sysfs_entry md_sync_min
=
4151 __ATTR(sync_speed_min
, S_IRUGO
|S_IWUSR
, sync_min_show
, sync_min_store
);
4154 sync_max_show(struct mddev
*mddev
, char *page
)
4156 return sprintf(page
, "%d (%s)\n", speed_max(mddev
),
4157 mddev
->sync_speed_max
? "local": "system");
4161 sync_max_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4165 if (strncmp(buf
, "system", 6)==0) {
4166 mddev
->sync_speed_max
= 0;
4169 max
= simple_strtoul(buf
, &e
, 10);
4170 if (buf
== e
|| (*e
&& *e
!= '\n') || max
<= 0)
4172 mddev
->sync_speed_max
= max
;
4176 static struct md_sysfs_entry md_sync_max
=
4177 __ATTR(sync_speed_max
, S_IRUGO
|S_IWUSR
, sync_max_show
, sync_max_store
);
4180 degraded_show(struct mddev
*mddev
, char *page
)
4182 return sprintf(page
, "%d\n", mddev
->degraded
);
4184 static struct md_sysfs_entry md_degraded
= __ATTR_RO(degraded
);
4187 sync_force_parallel_show(struct mddev
*mddev
, char *page
)
4189 return sprintf(page
, "%d\n", mddev
->parallel_resync
);
4193 sync_force_parallel_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4197 if (kstrtol(buf
, 10, &n
))
4200 if (n
!= 0 && n
!= 1)
4203 mddev
->parallel_resync
= n
;
4205 if (mddev
->sync_thread
)
4206 wake_up(&resync_wait
);
4211 /* force parallel resync, even with shared block devices */
4212 static struct md_sysfs_entry md_sync_force_parallel
=
4213 __ATTR(sync_force_parallel
, S_IRUGO
|S_IWUSR
,
4214 sync_force_parallel_show
, sync_force_parallel_store
);
4217 sync_speed_show(struct mddev
*mddev
, char *page
)
4219 unsigned long resync
, dt
, db
;
4220 if (mddev
->curr_resync
== 0)
4221 return sprintf(page
, "none\n");
4222 resync
= mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
);
4223 dt
= (jiffies
- mddev
->resync_mark
) / HZ
;
4225 db
= resync
- mddev
->resync_mark_cnt
;
4226 return sprintf(page
, "%lu\n", db
/dt
/2); /* K/sec */
4229 static struct md_sysfs_entry md_sync_speed
= __ATTR_RO(sync_speed
);
4232 sync_completed_show(struct mddev
*mddev
, char *page
)
4234 unsigned long long max_sectors
, resync
;
4236 if (!test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4237 return sprintf(page
, "none\n");
4239 if (mddev
->curr_resync
== 1 ||
4240 mddev
->curr_resync
== 2)
4241 return sprintf(page
, "delayed\n");
4243 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
4244 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
4245 max_sectors
= mddev
->resync_max_sectors
;
4247 max_sectors
= mddev
->dev_sectors
;
4249 resync
= mddev
->curr_resync_completed
;
4250 return sprintf(page
, "%llu / %llu\n", resync
, max_sectors
);
4253 static struct md_sysfs_entry md_sync_completed
= __ATTR_RO(sync_completed
);
4256 min_sync_show(struct mddev
*mddev
, char *page
)
4258 return sprintf(page
, "%llu\n",
4259 (unsigned long long)mddev
->resync_min
);
4262 min_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4264 unsigned long long min
;
4265 if (kstrtoull(buf
, 10, &min
))
4267 if (min
> mddev
->resync_max
)
4269 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4272 /* Must be a multiple of chunk_size */
4273 if (mddev
->chunk_sectors
) {
4274 sector_t temp
= min
;
4275 if (sector_div(temp
, mddev
->chunk_sectors
))
4278 mddev
->resync_min
= min
;
4283 static struct md_sysfs_entry md_min_sync
=
4284 __ATTR(sync_min
, S_IRUGO
|S_IWUSR
, min_sync_show
, min_sync_store
);
4287 max_sync_show(struct mddev
*mddev
, char *page
)
4289 if (mddev
->resync_max
== MaxSector
)
4290 return sprintf(page
, "max\n");
4292 return sprintf(page
, "%llu\n",
4293 (unsigned long long)mddev
->resync_max
);
4296 max_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4298 if (strncmp(buf
, "max", 3) == 0)
4299 mddev
->resync_max
= MaxSector
;
4301 unsigned long long max
;
4302 if (kstrtoull(buf
, 10, &max
))
4304 if (max
< mddev
->resync_min
)
4306 if (max
< mddev
->resync_max
&&
4308 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4311 /* Must be a multiple of chunk_size */
4312 if (mddev
->chunk_sectors
) {
4313 sector_t temp
= max
;
4314 if (sector_div(temp
, mddev
->chunk_sectors
))
4317 mddev
->resync_max
= max
;
4319 wake_up(&mddev
->recovery_wait
);
4323 static struct md_sysfs_entry md_max_sync
=
4324 __ATTR(sync_max
, S_IRUGO
|S_IWUSR
, max_sync_show
, max_sync_store
);
4327 suspend_lo_show(struct mddev
*mddev
, char *page
)
4329 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_lo
);
4333 suspend_lo_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4336 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4337 unsigned long long old
= mddev
->suspend_lo
;
4339 if (mddev
->pers
== NULL
||
4340 mddev
->pers
->quiesce
== NULL
)
4342 if (buf
== e
|| (*e
&& *e
!= '\n'))
4345 mddev
->suspend_lo
= new;
4347 /* Shrinking suspended region */
4348 mddev
->pers
->quiesce(mddev
, 2);
4350 /* Expanding suspended region - need to wait */
4351 mddev
->pers
->quiesce(mddev
, 1);
4352 mddev
->pers
->quiesce(mddev
, 0);
4356 static struct md_sysfs_entry md_suspend_lo
=
4357 __ATTR(suspend_lo
, S_IRUGO
|S_IWUSR
, suspend_lo_show
, suspend_lo_store
);
4360 suspend_hi_show(struct mddev
*mddev
, char *page
)
4362 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_hi
);
4366 suspend_hi_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4369 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4370 unsigned long long old
= mddev
->suspend_hi
;
4372 if (mddev
->pers
== NULL
||
4373 mddev
->pers
->quiesce
== NULL
)
4375 if (buf
== e
|| (*e
&& *e
!= '\n'))
4378 mddev
->suspend_hi
= new;
4380 /* Shrinking suspended region */
4381 mddev
->pers
->quiesce(mddev
, 2);
4383 /* Expanding suspended region - need to wait */
4384 mddev
->pers
->quiesce(mddev
, 1);
4385 mddev
->pers
->quiesce(mddev
, 0);
4389 static struct md_sysfs_entry md_suspend_hi
=
4390 __ATTR(suspend_hi
, S_IRUGO
|S_IWUSR
, suspend_hi_show
, suspend_hi_store
);
4393 reshape_position_show(struct mddev
*mddev
, char *page
)
4395 if (mddev
->reshape_position
!= MaxSector
)
4396 return sprintf(page
, "%llu\n",
4397 (unsigned long long)mddev
->reshape_position
);
4398 strcpy(page
, "none\n");
4403 reshape_position_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4405 struct md_rdev
*rdev
;
4407 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4410 if (buf
== e
|| (*e
&& *e
!= '\n'))
4412 mddev
->reshape_position
= new;
4413 mddev
->delta_disks
= 0;
4414 mddev
->reshape_backwards
= 0;
4415 mddev
->new_level
= mddev
->level
;
4416 mddev
->new_layout
= mddev
->layout
;
4417 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
4418 rdev_for_each(rdev
, mddev
)
4419 rdev
->new_data_offset
= rdev
->data_offset
;
4423 static struct md_sysfs_entry md_reshape_position
=
4424 __ATTR(reshape_position
, S_IRUGO
|S_IWUSR
, reshape_position_show
,
4425 reshape_position_store
);
4428 reshape_direction_show(struct mddev
*mddev
, char *page
)
4430 return sprintf(page
, "%s\n",
4431 mddev
->reshape_backwards
? "backwards" : "forwards");
4435 reshape_direction_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4438 if (cmd_match(buf
, "forwards"))
4440 else if (cmd_match(buf
, "backwards"))
4444 if (mddev
->reshape_backwards
== backwards
)
4447 /* check if we are allowed to change */
4448 if (mddev
->delta_disks
)
4451 if (mddev
->persistent
&&
4452 mddev
->major_version
== 0)
4455 mddev
->reshape_backwards
= backwards
;
4459 static struct md_sysfs_entry md_reshape_direction
=
4460 __ATTR(reshape_direction
, S_IRUGO
|S_IWUSR
, reshape_direction_show
,
4461 reshape_direction_store
);
4464 array_size_show(struct mddev
*mddev
, char *page
)
4466 if (mddev
->external_size
)
4467 return sprintf(page
, "%llu\n",
4468 (unsigned long long)mddev
->array_sectors
/2);
4470 return sprintf(page
, "default\n");
4474 array_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4478 if (strncmp(buf
, "default", 7) == 0) {
4480 sectors
= mddev
->pers
->size(mddev
, 0, 0);
4482 sectors
= mddev
->array_sectors
;
4484 mddev
->external_size
= 0;
4486 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
4488 if (mddev
->pers
&& mddev
->pers
->size(mddev
, 0, 0) < sectors
)
4491 mddev
->external_size
= 1;
4494 mddev
->array_sectors
= sectors
;
4496 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
4497 revalidate_disk(mddev
->gendisk
);
4502 static struct md_sysfs_entry md_array_size
=
4503 __ATTR(array_size
, S_IRUGO
|S_IWUSR
, array_size_show
,
4506 static struct attribute
*md_default_attrs
[] = {
4509 &md_raid_disks
.attr
,
4510 &md_chunk_size
.attr
,
4512 &md_resync_start
.attr
,
4514 &md_new_device
.attr
,
4515 &md_safe_delay
.attr
,
4516 &md_array_state
.attr
,
4517 &md_reshape_position
.attr
,
4518 &md_reshape_direction
.attr
,
4519 &md_array_size
.attr
,
4520 &max_corr_read_errors
.attr
,
4524 static struct attribute
*md_redundancy_attrs
[] = {
4526 &md_last_scan_mode
.attr
,
4527 &md_mismatches
.attr
,
4530 &md_sync_speed
.attr
,
4531 &md_sync_force_parallel
.attr
,
4532 &md_sync_completed
.attr
,
4535 &md_suspend_lo
.attr
,
4536 &md_suspend_hi
.attr
,
4541 static struct attribute_group md_redundancy_group
= {
4543 .attrs
= md_redundancy_attrs
,
4547 md_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
4549 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4550 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
4555 spin_lock(&all_mddevs_lock
);
4556 if (list_empty(&mddev
->all_mddevs
)) {
4557 spin_unlock(&all_mddevs_lock
);
4561 spin_unlock(&all_mddevs_lock
);
4563 rv
= mddev_lock(mddev
);
4565 rv
= entry
->show(mddev
, page
);
4566 mddev_unlock(mddev
);
4573 md_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
4574 const char *page
, size_t length
)
4576 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4577 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
4582 if (!capable(CAP_SYS_ADMIN
))
4584 spin_lock(&all_mddevs_lock
);
4585 if (list_empty(&mddev
->all_mddevs
)) {
4586 spin_unlock(&all_mddevs_lock
);
4590 spin_unlock(&all_mddevs_lock
);
4591 if (entry
->store
== new_dev_store
)
4592 flush_workqueue(md_misc_wq
);
4593 rv
= mddev_lock(mddev
);
4595 rv
= entry
->store(mddev
, page
, length
);
4596 mddev_unlock(mddev
);
4602 static void md_free(struct kobject
*ko
)
4604 struct mddev
*mddev
= container_of(ko
, struct mddev
, kobj
);
4606 if (mddev
->sysfs_state
)
4607 sysfs_put(mddev
->sysfs_state
);
4609 if (mddev
->gendisk
) {
4610 del_gendisk(mddev
->gendisk
);
4611 put_disk(mddev
->gendisk
);
4614 blk_cleanup_queue(mddev
->queue
);
4619 static const struct sysfs_ops md_sysfs_ops
= {
4620 .show
= md_attr_show
,
4621 .store
= md_attr_store
,
4623 static struct kobj_type md_ktype
= {
4625 .sysfs_ops
= &md_sysfs_ops
,
4626 .default_attrs
= md_default_attrs
,
4631 static void mddev_delayed_delete(struct work_struct
*ws
)
4633 struct mddev
*mddev
= container_of(ws
, struct mddev
, del_work
);
4635 sysfs_remove_group(&mddev
->kobj
, &md_bitmap_group
);
4636 kobject_del(&mddev
->kobj
);
4637 kobject_put(&mddev
->kobj
);
4640 static int md_alloc(dev_t dev
, char *name
)
4642 static DEFINE_MUTEX(disks_mutex
);
4643 struct mddev
*mddev
= mddev_find(dev
);
4644 struct gendisk
*disk
;
4653 partitioned
= (MAJOR(mddev
->unit
) != MD_MAJOR
);
4654 shift
= partitioned
? MdpMinorShift
: 0;
4655 unit
= MINOR(mddev
->unit
) >> shift
;
4657 /* wait for any previous instance of this device to be
4658 * completely removed (mddev_delayed_delete).
4660 flush_workqueue(md_misc_wq
);
4662 mutex_lock(&disks_mutex
);
4668 /* Need to ensure that 'name' is not a duplicate.
4670 struct mddev
*mddev2
;
4671 spin_lock(&all_mddevs_lock
);
4673 list_for_each_entry(mddev2
, &all_mddevs
, all_mddevs
)
4674 if (mddev2
->gendisk
&&
4675 strcmp(mddev2
->gendisk
->disk_name
, name
) == 0) {
4676 spin_unlock(&all_mddevs_lock
);
4679 spin_unlock(&all_mddevs_lock
);
4683 mddev
->queue
= blk_alloc_queue(GFP_KERNEL
);
4686 mddev
->queue
->queuedata
= mddev
;
4688 blk_queue_make_request(mddev
->queue
, md_make_request
);
4689 blk_set_stacking_limits(&mddev
->queue
->limits
);
4691 disk
= alloc_disk(1 << shift
);
4693 blk_cleanup_queue(mddev
->queue
);
4694 mddev
->queue
= NULL
;
4697 disk
->major
= MAJOR(mddev
->unit
);
4698 disk
->first_minor
= unit
<< shift
;
4700 strcpy(disk
->disk_name
, name
);
4701 else if (partitioned
)
4702 sprintf(disk
->disk_name
, "md_d%d", unit
);
4704 sprintf(disk
->disk_name
, "md%d", unit
);
4705 disk
->fops
= &md_fops
;
4706 disk
->private_data
= mddev
;
4707 disk
->queue
= mddev
->queue
;
4708 blk_queue_flush(mddev
->queue
, REQ_FLUSH
| REQ_FUA
);
4709 /* Allow extended partitions. This makes the
4710 * 'mdp' device redundant, but we can't really
4713 disk
->flags
|= GENHD_FL_EXT_DEVT
;
4714 mddev
->gendisk
= disk
;
4715 /* As soon as we call add_disk(), another thread could get
4716 * through to md_open, so make sure it doesn't get too far
4718 mutex_lock(&mddev
->open_mutex
);
4721 error
= kobject_init_and_add(&mddev
->kobj
, &md_ktype
,
4722 &disk_to_dev(disk
)->kobj
, "%s", "md");
4724 /* This isn't possible, but as kobject_init_and_add is marked
4725 * __must_check, we must do something with the result
4727 printk(KERN_WARNING
"md: cannot register %s/md - name in use\n",
4731 if (mddev
->kobj
.sd
&&
4732 sysfs_create_group(&mddev
->kobj
, &md_bitmap_group
))
4733 printk(KERN_DEBUG
"pointless warning\n");
4734 mutex_unlock(&mddev
->open_mutex
);
4736 mutex_unlock(&disks_mutex
);
4737 if (!error
&& mddev
->kobj
.sd
) {
4738 kobject_uevent(&mddev
->kobj
, KOBJ_ADD
);
4739 mddev
->sysfs_state
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "array_state");
4745 static struct kobject
*md_probe(dev_t dev
, int *part
, void *data
)
4747 md_alloc(dev
, NULL
);
4751 static int add_named_array(const char *val
, struct kernel_param
*kp
)
4753 /* val must be "md_*" where * is not all digits.
4754 * We allocate an array with a large free minor number, and
4755 * set the name to val. val must not already be an active name.
4757 int len
= strlen(val
);
4758 char buf
[DISK_NAME_LEN
];
4760 while (len
&& val
[len
-1] == '\n')
4762 if (len
>= DISK_NAME_LEN
)
4764 strlcpy(buf
, val
, len
+1);
4765 if (strncmp(buf
, "md_", 3) != 0)
4767 return md_alloc(0, buf
);
4770 static void md_safemode_timeout(unsigned long data
)
4772 struct mddev
*mddev
= (struct mddev
*) data
;
4774 if (!atomic_read(&mddev
->writes_pending
)) {
4775 mddev
->safemode
= 1;
4776 if (mddev
->external
)
4777 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4779 md_wakeup_thread(mddev
->thread
);
4782 static int start_dirty_degraded
;
4784 int md_run(struct mddev
*mddev
)
4787 struct md_rdev
*rdev
;
4788 struct md_personality
*pers
;
4790 if (list_empty(&mddev
->disks
))
4791 /* cannot run an array with no devices.. */
4796 /* Cannot run until previous stop completes properly */
4797 if (mddev
->sysfs_active
)
4801 * Analyze all RAID superblock(s)
4803 if (!mddev
->raid_disks
) {
4804 if (!mddev
->persistent
)
4809 if (mddev
->level
!= LEVEL_NONE
)
4810 request_module("md-level-%d", mddev
->level
);
4811 else if (mddev
->clevel
[0])
4812 request_module("md-%s", mddev
->clevel
);
4815 * Drop all container device buffers, from now on
4816 * the only valid external interface is through the md
4819 rdev_for_each(rdev
, mddev
) {
4820 if (test_bit(Faulty
, &rdev
->flags
))
4822 sync_blockdev(rdev
->bdev
);
4823 invalidate_bdev(rdev
->bdev
);
4825 /* perform some consistency tests on the device.
4826 * We don't want the data to overlap the metadata,
4827 * Internal Bitmap issues have been handled elsewhere.
4829 if (rdev
->meta_bdev
) {
4830 /* Nothing to check */;
4831 } else if (rdev
->data_offset
< rdev
->sb_start
) {
4832 if (mddev
->dev_sectors
&&
4833 rdev
->data_offset
+ mddev
->dev_sectors
4835 printk("md: %s: data overlaps metadata\n",
4840 if (rdev
->sb_start
+ rdev
->sb_size
/512
4841 > rdev
->data_offset
) {
4842 printk("md: %s: metadata overlaps data\n",
4847 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
4850 if (mddev
->bio_set
== NULL
)
4851 mddev
->bio_set
= bioset_create(BIO_POOL_SIZE
, 0);
4853 spin_lock(&pers_lock
);
4854 pers
= find_pers(mddev
->level
, mddev
->clevel
);
4855 if (!pers
|| !try_module_get(pers
->owner
)) {
4856 spin_unlock(&pers_lock
);
4857 if (mddev
->level
!= LEVEL_NONE
)
4858 printk(KERN_WARNING
"md: personality for level %d is not loaded!\n",
4861 printk(KERN_WARNING
"md: personality for level %s is not loaded!\n",
4866 spin_unlock(&pers_lock
);
4867 if (mddev
->level
!= pers
->level
) {
4868 mddev
->level
= pers
->level
;
4869 mddev
->new_level
= pers
->level
;
4871 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
4873 if (mddev
->reshape_position
!= MaxSector
&&
4874 pers
->start_reshape
== NULL
) {
4875 /* This personality cannot handle reshaping... */
4877 module_put(pers
->owner
);
4881 if (pers
->sync_request
) {
4882 /* Warn if this is a potentially silly
4885 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
4886 struct md_rdev
*rdev2
;
4889 rdev_for_each(rdev
, mddev
)
4890 rdev_for_each(rdev2
, mddev
) {
4892 rdev
->bdev
->bd_contains
==
4893 rdev2
->bdev
->bd_contains
) {
4895 "%s: WARNING: %s appears to be"
4896 " on the same physical disk as"
4899 bdevname(rdev
->bdev
,b
),
4900 bdevname(rdev2
->bdev
,b2
));
4907 "True protection against single-disk"
4908 " failure might be compromised.\n");
4911 mddev
->recovery
= 0;
4912 /* may be over-ridden by personality */
4913 mddev
->resync_max_sectors
= mddev
->dev_sectors
;
4915 mddev
->ok_start_degraded
= start_dirty_degraded
;
4917 if (start_readonly
&& mddev
->ro
== 0)
4918 mddev
->ro
= 2; /* read-only, but switch on first write */
4920 err
= mddev
->pers
->run(mddev
);
4922 printk(KERN_ERR
"md: pers->run() failed ...\n");
4923 else if (mddev
->pers
->size(mddev
, 0, 0) < mddev
->array_sectors
) {
4924 WARN_ONCE(!mddev
->external_size
, "%s: default size too small,"
4925 " but 'external_size' not in effect?\n", __func__
);
4927 "md: invalid array_size %llu > default size %llu\n",
4928 (unsigned long long)mddev
->array_sectors
/ 2,
4929 (unsigned long long)mddev
->pers
->size(mddev
, 0, 0) / 2);
4931 mddev
->pers
->stop(mddev
);
4933 if (err
== 0 && mddev
->pers
->sync_request
&&
4934 (mddev
->bitmap_info
.file
|| mddev
->bitmap_info
.offset
)) {
4935 err
= bitmap_create(mddev
);
4937 printk(KERN_ERR
"%s: failed to create bitmap (%d)\n",
4938 mdname(mddev
), err
);
4939 mddev
->pers
->stop(mddev
);
4943 module_put(mddev
->pers
->owner
);
4945 bitmap_destroy(mddev
);
4949 mddev
->queue
->backing_dev_info
.congested_data
= mddev
;
4950 mddev
->queue
->backing_dev_info
.congested_fn
= md_congested
;
4951 blk_queue_merge_bvec(mddev
->queue
, md_mergeable_bvec
);
4953 if (mddev
->pers
->sync_request
) {
4954 if (mddev
->kobj
.sd
&&
4955 sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
4957 "md: cannot register extra attributes for %s\n",
4959 mddev
->sysfs_action
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "sync_action");
4960 } else if (mddev
->ro
== 2) /* auto-readonly not meaningful */
4963 atomic_set(&mddev
->writes_pending
,0);
4964 atomic_set(&mddev
->max_corr_read_errors
,
4965 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS
);
4966 mddev
->safemode
= 0;
4967 mddev
->safemode_timer
.function
= md_safemode_timeout
;
4968 mddev
->safemode_timer
.data
= (unsigned long) mddev
;
4969 mddev
->safemode_delay
= (200 * HZ
)/1000 +1; /* 200 msec delay */
4973 rdev_for_each(rdev
, mddev
)
4974 if (rdev
->raid_disk
>= 0)
4975 if (sysfs_link_rdev(mddev
, rdev
))
4976 /* failure here is OK */;
4978 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4980 if (mddev
->flags
& MD_UPDATE_SB_FLAGS
)
4981 md_update_sb(mddev
, 0);
4983 md_new_event(mddev
);
4984 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4985 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
4986 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
4989 EXPORT_SYMBOL_GPL(md_run
);
4991 static int do_md_run(struct mddev
*mddev
)
4995 err
= md_run(mddev
);
4998 err
= bitmap_load(mddev
);
5000 bitmap_destroy(mddev
);
5004 md_wakeup_thread(mddev
->thread
);
5005 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
5007 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
5008 revalidate_disk(mddev
->gendisk
);
5010 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
5015 static int restart_array(struct mddev
*mddev
)
5017 struct gendisk
*disk
= mddev
->gendisk
;
5019 /* Complain if it has no devices */
5020 if (list_empty(&mddev
->disks
))
5026 mddev
->safemode
= 0;
5028 set_disk_ro(disk
, 0);
5029 printk(KERN_INFO
"md: %s switched to read-write mode.\n",
5031 /* Kick recovery or resync if necessary */
5032 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5033 md_wakeup_thread(mddev
->thread
);
5034 md_wakeup_thread(mddev
->sync_thread
);
5035 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5039 static void md_clean(struct mddev
*mddev
)
5041 mddev
->array_sectors
= 0;
5042 mddev
->external_size
= 0;
5043 mddev
->dev_sectors
= 0;
5044 mddev
->raid_disks
= 0;
5045 mddev
->recovery_cp
= 0;
5046 mddev
->resync_min
= 0;
5047 mddev
->resync_max
= MaxSector
;
5048 mddev
->reshape_position
= MaxSector
;
5049 mddev
->external
= 0;
5050 mddev
->persistent
= 0;
5051 mddev
->level
= LEVEL_NONE
;
5052 mddev
->clevel
[0] = 0;
5055 mddev
->metadata_type
[0] = 0;
5056 mddev
->chunk_sectors
= 0;
5057 mddev
->ctime
= mddev
->utime
= 0;
5059 mddev
->max_disks
= 0;
5061 mddev
->can_decrease_events
= 0;
5062 mddev
->delta_disks
= 0;
5063 mddev
->reshape_backwards
= 0;
5064 mddev
->new_level
= LEVEL_NONE
;
5065 mddev
->new_layout
= 0;
5066 mddev
->new_chunk_sectors
= 0;
5067 mddev
->curr_resync
= 0;
5068 atomic64_set(&mddev
->resync_mismatches
, 0);
5069 mddev
->suspend_lo
= mddev
->suspend_hi
= 0;
5070 mddev
->sync_speed_min
= mddev
->sync_speed_max
= 0;
5071 mddev
->recovery
= 0;
5074 mddev
->degraded
= 0;
5075 mddev
->safemode
= 0;
5076 mddev
->merge_check_needed
= 0;
5077 mddev
->bitmap_info
.offset
= 0;
5078 mddev
->bitmap_info
.default_offset
= 0;
5079 mddev
->bitmap_info
.default_space
= 0;
5080 mddev
->bitmap_info
.chunksize
= 0;
5081 mddev
->bitmap_info
.daemon_sleep
= 0;
5082 mddev
->bitmap_info
.max_write_behind
= 0;
5085 static void __md_stop_writes(struct mddev
*mddev
)
5087 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5088 flush_workqueue(md_misc_wq
);
5089 if (mddev
->sync_thread
) {
5090 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5091 md_reap_sync_thread(mddev
);
5094 del_timer_sync(&mddev
->safemode_timer
);
5096 bitmap_flush(mddev
);
5097 md_super_wait(mddev
);
5099 if (mddev
->ro
== 0 &&
5100 (!mddev
->in_sync
|| (mddev
->flags
& MD_UPDATE_SB_FLAGS
))) {
5101 /* mark array as shutdown cleanly */
5103 md_update_sb(mddev
, 1);
5107 void md_stop_writes(struct mddev
*mddev
)
5109 mddev_lock_nointr(mddev
);
5110 __md_stop_writes(mddev
);
5111 mddev_unlock(mddev
);
5113 EXPORT_SYMBOL_GPL(md_stop_writes
);
5115 static void __md_stop(struct mddev
*mddev
)
5118 mddev
->pers
->stop(mddev
);
5119 if (mddev
->pers
->sync_request
&& mddev
->to_remove
== NULL
)
5120 mddev
->to_remove
= &md_redundancy_group
;
5121 module_put(mddev
->pers
->owner
);
5123 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5126 void md_stop(struct mddev
*mddev
)
5128 /* stop the array and free an attached data structures.
5129 * This is called from dm-raid
5132 bitmap_destroy(mddev
);
5134 bioset_free(mddev
->bio_set
);
5137 EXPORT_SYMBOL_GPL(md_stop
);
5139 static int md_set_readonly(struct mddev
*mddev
, struct block_device
*bdev
)
5144 if (!test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
)) {
5146 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5147 md_wakeup_thread(mddev
->thread
);
5149 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
5150 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5151 if (mddev
->sync_thread
)
5152 /* Thread might be blocked waiting for metadata update
5153 * which will now never happen */
5154 wake_up_process(mddev
->sync_thread
->tsk
);
5156 mddev_unlock(mddev
);
5157 wait_event(resync_wait
, !test_bit(MD_RECOVERY_RUNNING
,
5159 mddev_lock_nointr(mddev
);
5161 mutex_lock(&mddev
->open_mutex
);
5162 if ((mddev
->pers
&& atomic_read(&mddev
->openers
) > !!bdev
) ||
5163 mddev
->sync_thread
||
5164 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
5165 (bdev
&& !test_bit(MD_STILL_CLOSED
, &mddev
->flags
))) {
5166 printk("md: %s still in use.\n",mdname(mddev
));
5168 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5169 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5170 md_wakeup_thread(mddev
->thread
);
5176 __md_stop_writes(mddev
);
5182 set_disk_ro(mddev
->gendisk
, 1);
5183 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5184 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5185 md_wakeup_thread(mddev
->thread
);
5186 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5190 mutex_unlock(&mddev
->open_mutex
);
5195 * 0 - completely stop and dis-assemble array
5196 * 2 - stop but do not disassemble array
5198 static int do_md_stop(struct mddev
*mddev
, int mode
,
5199 struct block_device
*bdev
)
5201 struct gendisk
*disk
= mddev
->gendisk
;
5202 struct md_rdev
*rdev
;
5205 if (!test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
)) {
5207 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5208 md_wakeup_thread(mddev
->thread
);
5210 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
5211 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5212 if (mddev
->sync_thread
)
5213 /* Thread might be blocked waiting for metadata update
5214 * which will now never happen */
5215 wake_up_process(mddev
->sync_thread
->tsk
);
5217 mddev_unlock(mddev
);
5218 wait_event(resync_wait
, (mddev
->sync_thread
== NULL
&&
5219 !test_bit(MD_RECOVERY_RUNNING
,
5220 &mddev
->recovery
)));
5221 mddev_lock_nointr(mddev
);
5223 mutex_lock(&mddev
->open_mutex
);
5224 if ((mddev
->pers
&& atomic_read(&mddev
->openers
) > !!bdev
) ||
5225 mddev
->sysfs_active
||
5226 mddev
->sync_thread
||
5227 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
5228 (bdev
&& !test_bit(MD_STILL_CLOSED
, &mddev
->flags
))) {
5229 printk("md: %s still in use.\n",mdname(mddev
));
5230 mutex_unlock(&mddev
->open_mutex
);
5232 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5233 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5234 md_wakeup_thread(mddev
->thread
);
5240 set_disk_ro(disk
, 0);
5242 __md_stop_writes(mddev
);
5244 mddev
->queue
->merge_bvec_fn
= NULL
;
5245 mddev
->queue
->backing_dev_info
.congested_fn
= NULL
;
5247 /* tell userspace to handle 'inactive' */
5248 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5250 rdev_for_each(rdev
, mddev
)
5251 if (rdev
->raid_disk
>= 0)
5252 sysfs_unlink_rdev(mddev
, rdev
);
5254 set_capacity(disk
, 0);
5255 mutex_unlock(&mddev
->open_mutex
);
5257 revalidate_disk(disk
);
5262 mutex_unlock(&mddev
->open_mutex
);
5264 * Free resources if final stop
5267 printk(KERN_INFO
"md: %s stopped.\n", mdname(mddev
));
5269 bitmap_destroy(mddev
);
5270 if (mddev
->bitmap_info
.file
) {
5271 fput(mddev
->bitmap_info
.file
);
5272 mddev
->bitmap_info
.file
= NULL
;
5274 mddev
->bitmap_info
.offset
= 0;
5276 export_array(mddev
);
5279 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
5280 if (mddev
->hold_active
== UNTIL_STOP
)
5281 mddev
->hold_active
= 0;
5283 blk_integrity_unregister(disk
);
5284 md_new_event(mddev
);
5285 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5290 static void autorun_array(struct mddev
*mddev
)
5292 struct md_rdev
*rdev
;
5295 if (list_empty(&mddev
->disks
))
5298 printk(KERN_INFO
"md: running: ");
5300 rdev_for_each(rdev
, mddev
) {
5301 char b
[BDEVNAME_SIZE
];
5302 printk("<%s>", bdevname(rdev
->bdev
,b
));
5306 err
= do_md_run(mddev
);
5308 printk(KERN_WARNING
"md: do_md_run() returned %d\n", err
);
5309 do_md_stop(mddev
, 0, NULL
);
5314 * lets try to run arrays based on all disks that have arrived
5315 * until now. (those are in pending_raid_disks)
5317 * the method: pick the first pending disk, collect all disks with
5318 * the same UUID, remove all from the pending list and put them into
5319 * the 'same_array' list. Then order this list based on superblock
5320 * update time (freshest comes first), kick out 'old' disks and
5321 * compare superblocks. If everything's fine then run it.
5323 * If "unit" is allocated, then bump its reference count
5325 static void autorun_devices(int part
)
5327 struct md_rdev
*rdev0
, *rdev
, *tmp
;
5328 struct mddev
*mddev
;
5329 char b
[BDEVNAME_SIZE
];
5331 printk(KERN_INFO
"md: autorun ...\n");
5332 while (!list_empty(&pending_raid_disks
)) {
5335 LIST_HEAD(candidates
);
5336 rdev0
= list_entry(pending_raid_disks
.next
,
5337 struct md_rdev
, same_set
);
5339 printk(KERN_INFO
"md: considering %s ...\n",
5340 bdevname(rdev0
->bdev
,b
));
5341 INIT_LIST_HEAD(&candidates
);
5342 rdev_for_each_list(rdev
, tmp
, &pending_raid_disks
)
5343 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
5344 printk(KERN_INFO
"md: adding %s ...\n",
5345 bdevname(rdev
->bdev
,b
));
5346 list_move(&rdev
->same_set
, &candidates
);
5349 * now we have a set of devices, with all of them having
5350 * mostly sane superblocks. It's time to allocate the
5354 dev
= MKDEV(mdp_major
,
5355 rdev0
->preferred_minor
<< MdpMinorShift
);
5356 unit
= MINOR(dev
) >> MdpMinorShift
;
5358 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
5361 if (rdev0
->preferred_minor
!= unit
) {
5362 printk(KERN_INFO
"md: unit number in %s is bad: %d\n",
5363 bdevname(rdev0
->bdev
, b
), rdev0
->preferred_minor
);
5367 md_probe(dev
, NULL
, NULL
);
5368 mddev
= mddev_find(dev
);
5369 if (!mddev
|| !mddev
->gendisk
) {
5373 "md: cannot allocate memory for md drive.\n");
5376 if (mddev_lock(mddev
))
5377 printk(KERN_WARNING
"md: %s locked, cannot run\n",
5379 else if (mddev
->raid_disks
|| mddev
->major_version
5380 || !list_empty(&mddev
->disks
)) {
5382 "md: %s already running, cannot run %s\n",
5383 mdname(mddev
), bdevname(rdev0
->bdev
,b
));
5384 mddev_unlock(mddev
);
5386 printk(KERN_INFO
"md: created %s\n", mdname(mddev
));
5387 mddev
->persistent
= 1;
5388 rdev_for_each_list(rdev
, tmp
, &candidates
) {
5389 list_del_init(&rdev
->same_set
);
5390 if (bind_rdev_to_array(rdev
, mddev
))
5393 autorun_array(mddev
);
5394 mddev_unlock(mddev
);
5396 /* on success, candidates will be empty, on error
5399 rdev_for_each_list(rdev
, tmp
, &candidates
) {
5400 list_del_init(&rdev
->same_set
);
5405 printk(KERN_INFO
"md: ... autorun DONE.\n");
5407 #endif /* !MODULE */
5409 static int get_version(void __user
*arg
)
5413 ver
.major
= MD_MAJOR_VERSION
;
5414 ver
.minor
= MD_MINOR_VERSION
;
5415 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
5417 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
5423 static int get_array_info(struct mddev
*mddev
, void __user
*arg
)
5425 mdu_array_info_t info
;
5426 int nr
,working
,insync
,failed
,spare
;
5427 struct md_rdev
*rdev
;
5429 nr
= working
= insync
= failed
= spare
= 0;
5431 rdev_for_each_rcu(rdev
, mddev
) {
5433 if (test_bit(Faulty
, &rdev
->flags
))
5437 if (test_bit(In_sync
, &rdev
->flags
))
5445 info
.major_version
= mddev
->major_version
;
5446 info
.minor_version
= mddev
->minor_version
;
5447 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
5448 info
.ctime
= mddev
->ctime
;
5449 info
.level
= mddev
->level
;
5450 info
.size
= mddev
->dev_sectors
/ 2;
5451 if (info
.size
!= mddev
->dev_sectors
/ 2) /* overflow */
5454 info
.raid_disks
= mddev
->raid_disks
;
5455 info
.md_minor
= mddev
->md_minor
;
5456 info
.not_persistent
= !mddev
->persistent
;
5458 info
.utime
= mddev
->utime
;
5461 info
.state
= (1<<MD_SB_CLEAN
);
5462 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
5463 info
.state
|= (1<<MD_SB_BITMAP_PRESENT
);
5464 info
.active_disks
= insync
;
5465 info
.working_disks
= working
;
5466 info
.failed_disks
= failed
;
5467 info
.spare_disks
= spare
;
5469 info
.layout
= mddev
->layout
;
5470 info
.chunk_size
= mddev
->chunk_sectors
<< 9;
5472 if (copy_to_user(arg
, &info
, sizeof(info
)))
5478 static int get_bitmap_file(struct mddev
*mddev
, void __user
* arg
)
5480 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
5481 char *ptr
, *buf
= NULL
;
5484 file
= kmalloc(sizeof(*file
), GFP_NOIO
);
5489 /* bitmap disabled, zero the first byte and copy out */
5490 if (!mddev
->bitmap
|| !mddev
->bitmap
->storage
.file
) {
5491 file
->pathname
[0] = '\0';
5495 buf
= kmalloc(sizeof(file
->pathname
), GFP_KERNEL
);
5499 ptr
= d_path(&mddev
->bitmap
->storage
.file
->f_path
,
5500 buf
, sizeof(file
->pathname
));
5504 strcpy(file
->pathname
, ptr
);
5508 if (copy_to_user(arg
, file
, sizeof(*file
)))
5516 static int get_disk_info(struct mddev
*mddev
, void __user
* arg
)
5518 mdu_disk_info_t info
;
5519 struct md_rdev
*rdev
;
5521 if (copy_from_user(&info
, arg
, sizeof(info
)))
5525 rdev
= find_rdev_nr_rcu(mddev
, info
.number
);
5527 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
5528 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
5529 info
.raid_disk
= rdev
->raid_disk
;
5531 if (test_bit(Faulty
, &rdev
->flags
))
5532 info
.state
|= (1<<MD_DISK_FAULTY
);
5533 else if (test_bit(In_sync
, &rdev
->flags
)) {
5534 info
.state
|= (1<<MD_DISK_ACTIVE
);
5535 info
.state
|= (1<<MD_DISK_SYNC
);
5537 if (test_bit(WriteMostly
, &rdev
->flags
))
5538 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
5540 info
.major
= info
.minor
= 0;
5541 info
.raid_disk
= -1;
5542 info
.state
= (1<<MD_DISK_REMOVED
);
5546 if (copy_to_user(arg
, &info
, sizeof(info
)))
5552 static int add_new_disk(struct mddev
*mddev
, mdu_disk_info_t
*info
)
5554 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
5555 struct md_rdev
*rdev
;
5556 dev_t dev
= MKDEV(info
->major
,info
->minor
);
5558 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
5561 if (!mddev
->raid_disks
) {
5563 /* expecting a device which has a superblock */
5564 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
5567 "md: md_import_device returned %ld\n",
5569 return PTR_ERR(rdev
);
5571 if (!list_empty(&mddev
->disks
)) {
5572 struct md_rdev
*rdev0
5573 = list_entry(mddev
->disks
.next
,
5574 struct md_rdev
, same_set
);
5575 err
= super_types
[mddev
->major_version
]
5576 .load_super(rdev
, rdev0
, mddev
->minor_version
);
5579 "md: %s has different UUID to %s\n",
5580 bdevname(rdev
->bdev
,b
),
5581 bdevname(rdev0
->bdev
,b2
));
5586 err
= bind_rdev_to_array(rdev
, mddev
);
5593 * add_new_disk can be used once the array is assembled
5594 * to add "hot spares". They must already have a superblock
5599 if (!mddev
->pers
->hot_add_disk
) {
5601 "%s: personality does not support diskops!\n",
5605 if (mddev
->persistent
)
5606 rdev
= md_import_device(dev
, mddev
->major_version
,
5607 mddev
->minor_version
);
5609 rdev
= md_import_device(dev
, -1, -1);
5612 "md: md_import_device returned %ld\n",
5614 return PTR_ERR(rdev
);
5616 /* set saved_raid_disk if appropriate */
5617 if (!mddev
->persistent
) {
5618 if (info
->state
& (1<<MD_DISK_SYNC
) &&
5619 info
->raid_disk
< mddev
->raid_disks
) {
5620 rdev
->raid_disk
= info
->raid_disk
;
5621 set_bit(In_sync
, &rdev
->flags
);
5622 clear_bit(Bitmap_sync
, &rdev
->flags
);
5624 rdev
->raid_disk
= -1;
5625 rdev
->saved_raid_disk
= rdev
->raid_disk
;
5627 super_types
[mddev
->major_version
].
5628 validate_super(mddev
, rdev
);
5629 if ((info
->state
& (1<<MD_DISK_SYNC
)) &&
5630 rdev
->raid_disk
!= info
->raid_disk
) {
5631 /* This was a hot-add request, but events doesn't
5632 * match, so reject it.
5638 clear_bit(In_sync
, &rdev
->flags
); /* just to be sure */
5639 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
5640 set_bit(WriteMostly
, &rdev
->flags
);
5642 clear_bit(WriteMostly
, &rdev
->flags
);
5644 rdev
->raid_disk
= -1;
5645 err
= bind_rdev_to_array(rdev
, mddev
);
5646 if (!err
&& !mddev
->pers
->hot_remove_disk
) {
5647 /* If there is hot_add_disk but no hot_remove_disk
5648 * then added disks for geometry changes,
5649 * and should be added immediately.
5651 super_types
[mddev
->major_version
].
5652 validate_super(mddev
, rdev
);
5653 err
= mddev
->pers
->hot_add_disk(mddev
, rdev
);
5655 unbind_rdev_from_array(rdev
);
5660 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
5662 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
5663 if (mddev
->degraded
)
5664 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
5665 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5667 md_new_event(mddev
);
5668 md_wakeup_thread(mddev
->thread
);
5672 /* otherwise, add_new_disk is only allowed
5673 * for major_version==0 superblocks
5675 if (mddev
->major_version
!= 0) {
5676 printk(KERN_WARNING
"%s: ADD_NEW_DISK not supported\n",
5681 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
5683 rdev
= md_import_device(dev
, -1, 0);
5686 "md: error, md_import_device() returned %ld\n",
5688 return PTR_ERR(rdev
);
5690 rdev
->desc_nr
= info
->number
;
5691 if (info
->raid_disk
< mddev
->raid_disks
)
5692 rdev
->raid_disk
= info
->raid_disk
;
5694 rdev
->raid_disk
= -1;
5696 if (rdev
->raid_disk
< mddev
->raid_disks
)
5697 if (info
->state
& (1<<MD_DISK_SYNC
))
5698 set_bit(In_sync
, &rdev
->flags
);
5700 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
5701 set_bit(WriteMostly
, &rdev
->flags
);
5703 if (!mddev
->persistent
) {
5704 printk(KERN_INFO
"md: nonpersistent superblock ...\n");
5705 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
5707 rdev
->sb_start
= calc_dev_sboffset(rdev
);
5708 rdev
->sectors
= rdev
->sb_start
;
5710 err
= bind_rdev_to_array(rdev
, mddev
);
5720 static int hot_remove_disk(struct mddev
*mddev
, dev_t dev
)
5722 char b
[BDEVNAME_SIZE
];
5723 struct md_rdev
*rdev
;
5725 rdev
= find_rdev(mddev
, dev
);
5729 clear_bit(Blocked
, &rdev
->flags
);
5730 remove_and_add_spares(mddev
, rdev
);
5732 if (rdev
->raid_disk
>= 0)
5735 kick_rdev_from_array(rdev
);
5736 md_update_sb(mddev
, 1);
5737 md_new_event(mddev
);
5741 printk(KERN_WARNING
"md: cannot remove active disk %s from %s ...\n",
5742 bdevname(rdev
->bdev
,b
), mdname(mddev
));
5746 static int hot_add_disk(struct mddev
*mddev
, dev_t dev
)
5748 char b
[BDEVNAME_SIZE
];
5750 struct md_rdev
*rdev
;
5755 if (mddev
->major_version
!= 0) {
5756 printk(KERN_WARNING
"%s: HOT_ADD may only be used with"
5757 " version-0 superblocks.\n",
5761 if (!mddev
->pers
->hot_add_disk
) {
5763 "%s: personality does not support diskops!\n",
5768 rdev
= md_import_device(dev
, -1, 0);
5771 "md: error, md_import_device() returned %ld\n",
5776 if (mddev
->persistent
)
5777 rdev
->sb_start
= calc_dev_sboffset(rdev
);
5779 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
5781 rdev
->sectors
= rdev
->sb_start
;
5783 if (test_bit(Faulty
, &rdev
->flags
)) {
5785 "md: can not hot-add faulty %s disk to %s!\n",
5786 bdevname(rdev
->bdev
,b
), mdname(mddev
));
5790 clear_bit(In_sync
, &rdev
->flags
);
5792 rdev
->saved_raid_disk
= -1;
5793 err
= bind_rdev_to_array(rdev
, mddev
);
5798 * The rest should better be atomic, we can have disk failures
5799 * noticed in interrupt contexts ...
5802 rdev
->raid_disk
= -1;
5804 md_update_sb(mddev
, 1);
5807 * Kick recovery, maybe this spare has to be added to the
5808 * array immediately.
5810 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5811 md_wakeup_thread(mddev
->thread
);
5812 md_new_event(mddev
);
5820 static int set_bitmap_file(struct mddev
*mddev
, int fd
)
5825 if (!mddev
->pers
->quiesce
|| !mddev
->thread
)
5827 if (mddev
->recovery
|| mddev
->sync_thread
)
5829 /* we should be able to change the bitmap.. */
5833 struct inode
*inode
;
5835 return -EEXIST
; /* cannot add when bitmap is present */
5836 mddev
->bitmap_info
.file
= fget(fd
);
5838 if (mddev
->bitmap_info
.file
== NULL
) {
5839 printk(KERN_ERR
"%s: error: failed to get bitmap file\n",
5844 inode
= mddev
->bitmap_info
.file
->f_mapping
->host
;
5845 if (!S_ISREG(inode
->i_mode
)) {
5846 printk(KERN_ERR
"%s: error: bitmap file must be a regular file\n",
5849 } else if (!(mddev
->bitmap_info
.file
->f_mode
& FMODE_WRITE
)) {
5850 printk(KERN_ERR
"%s: error: bitmap file must open for write\n",
5853 } else if (atomic_read(&inode
->i_writecount
) != 1) {
5854 printk(KERN_ERR
"%s: error: bitmap file is already in use\n",
5859 fput(mddev
->bitmap_info
.file
);
5860 mddev
->bitmap_info
.file
= NULL
;
5863 mddev
->bitmap_info
.offset
= 0; /* file overrides offset */
5864 } else if (mddev
->bitmap
== NULL
)
5865 return -ENOENT
; /* cannot remove what isn't there */
5868 mddev
->pers
->quiesce(mddev
, 1);
5870 err
= bitmap_create(mddev
);
5872 err
= bitmap_load(mddev
);
5874 if (fd
< 0 || err
) {
5875 bitmap_destroy(mddev
);
5876 fd
= -1; /* make sure to put the file */
5878 mddev
->pers
->quiesce(mddev
, 0);
5881 if (mddev
->bitmap_info
.file
)
5882 fput(mddev
->bitmap_info
.file
);
5883 mddev
->bitmap_info
.file
= NULL
;
5890 * set_array_info is used two different ways
5891 * The original usage is when creating a new array.
5892 * In this usage, raid_disks is > 0 and it together with
5893 * level, size, not_persistent,layout,chunksize determine the
5894 * shape of the array.
5895 * This will always create an array with a type-0.90.0 superblock.
5896 * The newer usage is when assembling an array.
5897 * In this case raid_disks will be 0, and the major_version field is
5898 * use to determine which style super-blocks are to be found on the devices.
5899 * The minor and patch _version numbers are also kept incase the
5900 * super_block handler wishes to interpret them.
5902 static int set_array_info(struct mddev
*mddev
, mdu_array_info_t
*info
)
5905 if (info
->raid_disks
== 0) {
5906 /* just setting version number for superblock loading */
5907 if (info
->major_version
< 0 ||
5908 info
->major_version
>= ARRAY_SIZE(super_types
) ||
5909 super_types
[info
->major_version
].name
== NULL
) {
5910 /* maybe try to auto-load a module? */
5912 "md: superblock version %d not known\n",
5913 info
->major_version
);
5916 mddev
->major_version
= info
->major_version
;
5917 mddev
->minor_version
= info
->minor_version
;
5918 mddev
->patch_version
= info
->patch_version
;
5919 mddev
->persistent
= !info
->not_persistent
;
5920 /* ensure mddev_put doesn't delete this now that there
5921 * is some minimal configuration.
5923 mddev
->ctime
= get_seconds();
5926 mddev
->major_version
= MD_MAJOR_VERSION
;
5927 mddev
->minor_version
= MD_MINOR_VERSION
;
5928 mddev
->patch_version
= MD_PATCHLEVEL_VERSION
;
5929 mddev
->ctime
= get_seconds();
5931 mddev
->level
= info
->level
;
5932 mddev
->clevel
[0] = 0;
5933 mddev
->dev_sectors
= 2 * (sector_t
)info
->size
;
5934 mddev
->raid_disks
= info
->raid_disks
;
5935 /* don't set md_minor, it is determined by which /dev/md* was
5938 if (info
->state
& (1<<MD_SB_CLEAN
))
5939 mddev
->recovery_cp
= MaxSector
;
5941 mddev
->recovery_cp
= 0;
5942 mddev
->persistent
= ! info
->not_persistent
;
5943 mddev
->external
= 0;
5945 mddev
->layout
= info
->layout
;
5946 mddev
->chunk_sectors
= info
->chunk_size
>> 9;
5948 mddev
->max_disks
= MD_SB_DISKS
;
5950 if (mddev
->persistent
)
5952 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
5954 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
5955 mddev
->bitmap_info
.default_space
= 64*2 - (MD_SB_BYTES
>> 9);
5956 mddev
->bitmap_info
.offset
= 0;
5958 mddev
->reshape_position
= MaxSector
;
5961 * Generate a 128 bit UUID
5963 get_random_bytes(mddev
->uuid
, 16);
5965 mddev
->new_level
= mddev
->level
;
5966 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
5967 mddev
->new_layout
= mddev
->layout
;
5968 mddev
->delta_disks
= 0;
5969 mddev
->reshape_backwards
= 0;
5974 void md_set_array_sectors(struct mddev
*mddev
, sector_t array_sectors
)
5976 WARN(!mddev_is_locked(mddev
), "%s: unlocked mddev!\n", __func__
);
5978 if (mddev
->external_size
)
5981 mddev
->array_sectors
= array_sectors
;
5983 EXPORT_SYMBOL(md_set_array_sectors
);
5985 static int update_size(struct mddev
*mddev
, sector_t num_sectors
)
5987 struct md_rdev
*rdev
;
5989 int fit
= (num_sectors
== 0);
5991 if (mddev
->pers
->resize
== NULL
)
5993 /* The "num_sectors" is the number of sectors of each device that
5994 * is used. This can only make sense for arrays with redundancy.
5995 * linear and raid0 always use whatever space is available. We can only
5996 * consider changing this number if no resync or reconstruction is
5997 * happening, and if the new size is acceptable. It must fit before the
5998 * sb_start or, if that is <data_offset, it must fit before the size
5999 * of each device. If num_sectors is zero, we find the largest size
6002 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
6008 rdev_for_each(rdev
, mddev
) {
6009 sector_t avail
= rdev
->sectors
;
6011 if (fit
&& (num_sectors
== 0 || num_sectors
> avail
))
6012 num_sectors
= avail
;
6013 if (avail
< num_sectors
)
6016 rv
= mddev
->pers
->resize(mddev
, num_sectors
);
6018 revalidate_disk(mddev
->gendisk
);
6022 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
)
6025 struct md_rdev
*rdev
;
6026 /* change the number of raid disks */
6027 if (mddev
->pers
->check_reshape
== NULL
)
6031 if (raid_disks
<= 0 ||
6032 (mddev
->max_disks
&& raid_disks
>= mddev
->max_disks
))
6034 if (mddev
->sync_thread
||
6035 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
6036 mddev
->reshape_position
!= MaxSector
)
6039 rdev_for_each(rdev
, mddev
) {
6040 if (mddev
->raid_disks
< raid_disks
&&
6041 rdev
->data_offset
< rdev
->new_data_offset
)
6043 if (mddev
->raid_disks
> raid_disks
&&
6044 rdev
->data_offset
> rdev
->new_data_offset
)
6048 mddev
->delta_disks
= raid_disks
- mddev
->raid_disks
;
6049 if (mddev
->delta_disks
< 0)
6050 mddev
->reshape_backwards
= 1;
6051 else if (mddev
->delta_disks
> 0)
6052 mddev
->reshape_backwards
= 0;
6054 rv
= mddev
->pers
->check_reshape(mddev
);
6056 mddev
->delta_disks
= 0;
6057 mddev
->reshape_backwards
= 0;
6063 * update_array_info is used to change the configuration of an
6065 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
6066 * fields in the info are checked against the array.
6067 * Any differences that cannot be handled will cause an error.
6068 * Normally, only one change can be managed at a time.
6070 static int update_array_info(struct mddev
*mddev
, mdu_array_info_t
*info
)
6076 /* calculate expected state,ignoring low bits */
6077 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
6078 state
|= (1 << MD_SB_BITMAP_PRESENT
);
6080 if (mddev
->major_version
!= info
->major_version
||
6081 mddev
->minor_version
!= info
->minor_version
||
6082 /* mddev->patch_version != info->patch_version || */
6083 mddev
->ctime
!= info
->ctime
||
6084 mddev
->level
!= info
->level
||
6085 /* mddev->layout != info->layout || */
6086 !mddev
->persistent
!= info
->not_persistent
||
6087 mddev
->chunk_sectors
!= info
->chunk_size
>> 9 ||
6088 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
6089 ((state
^info
->state
) & 0xfffffe00)
6092 /* Check there is only one change */
6093 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
6095 if (mddev
->raid_disks
!= info
->raid_disks
)
6097 if (mddev
->layout
!= info
->layout
)
6099 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
))
6106 if (mddev
->layout
!= info
->layout
) {
6108 * we don't need to do anything at the md level, the
6109 * personality will take care of it all.
6111 if (mddev
->pers
->check_reshape
== NULL
)
6114 mddev
->new_layout
= info
->layout
;
6115 rv
= mddev
->pers
->check_reshape(mddev
);
6117 mddev
->new_layout
= mddev
->layout
;
6121 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
6122 rv
= update_size(mddev
, (sector_t
)info
->size
* 2);
6124 if (mddev
->raid_disks
!= info
->raid_disks
)
6125 rv
= update_raid_disks(mddev
, info
->raid_disks
);
6127 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) {
6128 if (mddev
->pers
->quiesce
== NULL
|| mddev
->thread
== NULL
)
6130 if (mddev
->recovery
|| mddev
->sync_thread
)
6132 if (info
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
6133 /* add the bitmap */
6136 if (mddev
->bitmap_info
.default_offset
== 0)
6138 mddev
->bitmap_info
.offset
=
6139 mddev
->bitmap_info
.default_offset
;
6140 mddev
->bitmap_info
.space
=
6141 mddev
->bitmap_info
.default_space
;
6142 mddev
->pers
->quiesce(mddev
, 1);
6143 rv
= bitmap_create(mddev
);
6145 rv
= bitmap_load(mddev
);
6147 bitmap_destroy(mddev
);
6148 mddev
->pers
->quiesce(mddev
, 0);
6150 /* remove the bitmap */
6153 if (mddev
->bitmap
->storage
.file
)
6155 mddev
->pers
->quiesce(mddev
, 1);
6156 bitmap_destroy(mddev
);
6157 mddev
->pers
->quiesce(mddev
, 0);
6158 mddev
->bitmap_info
.offset
= 0;
6161 md_update_sb(mddev
, 1);
6165 static int set_disk_faulty(struct mddev
*mddev
, dev_t dev
)
6167 struct md_rdev
*rdev
;
6170 if (mddev
->pers
== NULL
)
6174 rdev
= find_rdev_rcu(mddev
, dev
);
6178 md_error(mddev
, rdev
);
6179 if (!test_bit(Faulty
, &rdev
->flags
))
6187 * We have a problem here : there is no easy way to give a CHS
6188 * virtual geometry. We currently pretend that we have a 2 heads
6189 * 4 sectors (with a BIG number of cylinders...). This drives
6190 * dosfs just mad... ;-)
6192 static int md_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
6194 struct mddev
*mddev
= bdev
->bd_disk
->private_data
;
6198 geo
->cylinders
= mddev
->array_sectors
/ 8;
6202 static inline bool md_ioctl_valid(unsigned int cmd
)
6207 case GET_ARRAY_INFO
:
6208 case GET_BITMAP_FILE
:
6211 case HOT_REMOVE_DISK
:
6214 case RESTART_ARRAY_RW
:
6216 case SET_ARRAY_INFO
:
6217 case SET_BITMAP_FILE
:
6218 case SET_DISK_FAULTY
:
6227 static int md_ioctl(struct block_device
*bdev
, fmode_t mode
,
6228 unsigned int cmd
, unsigned long arg
)
6231 void __user
*argp
= (void __user
*)arg
;
6232 struct mddev
*mddev
= NULL
;
6235 if (!md_ioctl_valid(cmd
))
6240 case GET_ARRAY_INFO
:
6244 if (!capable(CAP_SYS_ADMIN
))
6249 * Commands dealing with the RAID driver but not any
6254 err
= get_version(argp
);
6260 autostart_arrays(arg
);
6267 * Commands creating/starting a new array:
6270 mddev
= bdev
->bd_disk
->private_data
;
6277 /* Some actions do not requires the mutex */
6279 case GET_ARRAY_INFO
:
6280 if (!mddev
->raid_disks
&& !mddev
->external
)
6283 err
= get_array_info(mddev
, argp
);
6287 if (!mddev
->raid_disks
&& !mddev
->external
)
6290 err
= get_disk_info(mddev
, argp
);
6293 case SET_DISK_FAULTY
:
6294 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
6298 if (cmd
== ADD_NEW_DISK
)
6299 /* need to ensure md_delayed_delete() has completed */
6300 flush_workqueue(md_misc_wq
);
6302 if (cmd
== HOT_REMOVE_DISK
)
6303 /* need to ensure recovery thread has run */
6304 wait_event_interruptible_timeout(mddev
->sb_wait
,
6305 !test_bit(MD_RECOVERY_NEEDED
,
6307 msecs_to_jiffies(5000));
6308 if (cmd
== STOP_ARRAY
|| cmd
== STOP_ARRAY_RO
) {
6309 /* Need to flush page cache, and ensure no-one else opens
6312 mutex_lock(&mddev
->open_mutex
);
6313 if (mddev
->pers
&& atomic_read(&mddev
->openers
) > 1) {
6314 mutex_unlock(&mddev
->open_mutex
);
6318 set_bit(MD_STILL_CLOSED
, &mddev
->flags
);
6319 mutex_unlock(&mddev
->open_mutex
);
6320 sync_blockdev(bdev
);
6322 err
= mddev_lock(mddev
);
6325 "md: ioctl lock interrupted, reason %d, cmd %d\n",
6330 if (cmd
== SET_ARRAY_INFO
) {
6331 mdu_array_info_t info
;
6333 memset(&info
, 0, sizeof(info
));
6334 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
6339 err
= update_array_info(mddev
, &info
);
6341 printk(KERN_WARNING
"md: couldn't update"
6342 " array info. %d\n", err
);
6347 if (!list_empty(&mddev
->disks
)) {
6349 "md: array %s already has disks!\n",
6354 if (mddev
->raid_disks
) {
6356 "md: array %s already initialised!\n",
6361 err
= set_array_info(mddev
, &info
);
6363 printk(KERN_WARNING
"md: couldn't set"
6364 " array info. %d\n", err
);
6371 * Commands querying/configuring an existing array:
6373 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
6374 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
6375 if ((!mddev
->raid_disks
&& !mddev
->external
)
6376 && cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
6377 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
6378 && cmd
!= GET_BITMAP_FILE
) {
6384 * Commands even a read-only array can execute:
6387 case GET_BITMAP_FILE
:
6388 err
= get_bitmap_file(mddev
, argp
);
6391 case RESTART_ARRAY_RW
:
6392 err
= restart_array(mddev
);
6396 err
= do_md_stop(mddev
, 0, bdev
);
6400 err
= md_set_readonly(mddev
, bdev
);
6403 case HOT_REMOVE_DISK
:
6404 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
6408 /* We can support ADD_NEW_DISK on read-only arrays
6409 * on if we are re-adding a preexisting device.
6410 * So require mddev->pers and MD_DISK_SYNC.
6413 mdu_disk_info_t info
;
6414 if (copy_from_user(&info
, argp
, sizeof(info
)))
6416 else if (!(info
.state
& (1<<MD_DISK_SYNC
)))
6417 /* Need to clear read-only for this */
6420 err
= add_new_disk(mddev
, &info
);
6426 if (get_user(ro
, (int __user
*)(arg
))) {
6432 /* if the bdev is going readonly the value of mddev->ro
6433 * does not matter, no writes are coming
6438 /* are we are already prepared for writes? */
6442 /* transitioning to readauto need only happen for
6443 * arrays that call md_write_start
6446 err
= restart_array(mddev
);
6449 set_disk_ro(mddev
->gendisk
, 0);
6456 * The remaining ioctls are changing the state of the
6457 * superblock, so we do not allow them on read-only arrays.
6459 if (mddev
->ro
&& mddev
->pers
) {
6460 if (mddev
->ro
== 2) {
6462 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6463 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6464 /* mddev_unlock will wake thread */
6465 /* If a device failed while we were read-only, we
6466 * need to make sure the metadata is updated now.
6468 if (test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
6469 mddev_unlock(mddev
);
6470 wait_event(mddev
->sb_wait
,
6471 !test_bit(MD_CHANGE_DEVS
, &mddev
->flags
) &&
6472 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
6473 mddev_lock_nointr(mddev
);
6484 mdu_disk_info_t info
;
6485 if (copy_from_user(&info
, argp
, sizeof(info
)))
6488 err
= add_new_disk(mddev
, &info
);
6493 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
6497 err
= do_md_run(mddev
);
6500 case SET_BITMAP_FILE
:
6501 err
= set_bitmap_file(mddev
, (int)arg
);
6510 if (mddev
->hold_active
== UNTIL_IOCTL
&&
6512 mddev
->hold_active
= 0;
6513 mddev_unlock(mddev
);
6517 #ifdef CONFIG_COMPAT
6518 static int md_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
6519 unsigned int cmd
, unsigned long arg
)
6522 case HOT_REMOVE_DISK
:
6524 case SET_DISK_FAULTY
:
6525 case SET_BITMAP_FILE
:
6526 /* These take in integer arg, do not convert */
6529 arg
= (unsigned long)compat_ptr(arg
);
6533 return md_ioctl(bdev
, mode
, cmd
, arg
);
6535 #endif /* CONFIG_COMPAT */
6537 static int md_open(struct block_device
*bdev
, fmode_t mode
)
6540 * Succeed if we can lock the mddev, which confirms that
6541 * it isn't being stopped right now.
6543 struct mddev
*mddev
= mddev_find(bdev
->bd_dev
);
6549 if (mddev
->gendisk
!= bdev
->bd_disk
) {
6550 /* we are racing with mddev_put which is discarding this
6554 /* Wait until bdev->bd_disk is definitely gone */
6555 flush_workqueue(md_misc_wq
);
6556 /* Then retry the open from the top */
6557 return -ERESTARTSYS
;
6559 BUG_ON(mddev
!= bdev
->bd_disk
->private_data
);
6561 if ((err
= mutex_lock_interruptible(&mddev
->open_mutex
)))
6565 atomic_inc(&mddev
->openers
);
6566 clear_bit(MD_STILL_CLOSED
, &mddev
->flags
);
6567 mutex_unlock(&mddev
->open_mutex
);
6569 check_disk_change(bdev
);
6574 static void md_release(struct gendisk
*disk
, fmode_t mode
)
6576 struct mddev
*mddev
= disk
->private_data
;
6579 atomic_dec(&mddev
->openers
);
6583 static int md_media_changed(struct gendisk
*disk
)
6585 struct mddev
*mddev
= disk
->private_data
;
6587 return mddev
->changed
;
6590 static int md_revalidate(struct gendisk
*disk
)
6592 struct mddev
*mddev
= disk
->private_data
;
6597 static const struct block_device_operations md_fops
=
6599 .owner
= THIS_MODULE
,
6601 .release
= md_release
,
6603 #ifdef CONFIG_COMPAT
6604 .compat_ioctl
= md_compat_ioctl
,
6606 .getgeo
= md_getgeo
,
6607 .media_changed
= md_media_changed
,
6608 .revalidate_disk
= md_revalidate
,
6611 static int md_thread(void *arg
)
6613 struct md_thread
*thread
= arg
;
6616 * md_thread is a 'system-thread', it's priority should be very
6617 * high. We avoid resource deadlocks individually in each
6618 * raid personality. (RAID5 does preallocation) We also use RR and
6619 * the very same RT priority as kswapd, thus we will never get
6620 * into a priority inversion deadlock.
6622 * we definitely have to have equal or higher priority than
6623 * bdflush, otherwise bdflush will deadlock if there are too
6624 * many dirty RAID5 blocks.
6627 allow_signal(SIGKILL
);
6628 while (!kthread_should_stop()) {
6630 /* We need to wait INTERRUPTIBLE so that
6631 * we don't add to the load-average.
6632 * That means we need to be sure no signals are
6635 if (signal_pending(current
))
6636 flush_signals(current
);
6638 wait_event_interruptible_timeout
6640 test_bit(THREAD_WAKEUP
, &thread
->flags
)
6641 || kthread_should_stop(),
6644 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
6645 if (!kthread_should_stop())
6646 thread
->run(thread
);
6652 void md_wakeup_thread(struct md_thread
*thread
)
6655 pr_debug("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
6656 set_bit(THREAD_WAKEUP
, &thread
->flags
);
6657 wake_up(&thread
->wqueue
);
6660 EXPORT_SYMBOL(md_wakeup_thread
);
6662 struct md_thread
*md_register_thread(void (*run
) (struct md_thread
*),
6663 struct mddev
*mddev
, const char *name
)
6665 struct md_thread
*thread
;
6667 thread
= kzalloc(sizeof(struct md_thread
), GFP_KERNEL
);
6671 init_waitqueue_head(&thread
->wqueue
);
6674 thread
->mddev
= mddev
;
6675 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
6676 thread
->tsk
= kthread_run(md_thread
, thread
,
6678 mdname(thread
->mddev
),
6680 if (IS_ERR(thread
->tsk
)) {
6686 EXPORT_SYMBOL(md_register_thread
);
6688 void md_unregister_thread(struct md_thread
**threadp
)
6690 struct md_thread
*thread
= *threadp
;
6693 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread
->tsk
));
6694 /* Locking ensures that mddev_unlock does not wake_up a
6695 * non-existent thread
6697 spin_lock(&pers_lock
);
6699 spin_unlock(&pers_lock
);
6701 kthread_stop(thread
->tsk
);
6704 EXPORT_SYMBOL(md_unregister_thread
);
6706 void md_error(struct mddev
*mddev
, struct md_rdev
*rdev
)
6708 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
6711 if (!mddev
->pers
|| !mddev
->pers
->error_handler
)
6713 mddev
->pers
->error_handler(mddev
,rdev
);
6714 if (mddev
->degraded
)
6715 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
6716 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
6717 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6718 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6719 md_wakeup_thread(mddev
->thread
);
6720 if (mddev
->event_work
.func
)
6721 queue_work(md_misc_wq
, &mddev
->event_work
);
6722 md_new_event_inintr(mddev
);
6724 EXPORT_SYMBOL(md_error
);
6726 /* seq_file implementation /proc/mdstat */
6728 static void status_unused(struct seq_file
*seq
)
6731 struct md_rdev
*rdev
;
6733 seq_printf(seq
, "unused devices: ");
6735 list_for_each_entry(rdev
, &pending_raid_disks
, same_set
) {
6736 char b
[BDEVNAME_SIZE
];
6738 seq_printf(seq
, "%s ",
6739 bdevname(rdev
->bdev
,b
));
6742 seq_printf(seq
, "<none>");
6744 seq_printf(seq
, "\n");
6747 static void status_resync(struct seq_file
*seq
, struct mddev
*mddev
)
6749 sector_t max_sectors
, resync
, res
;
6750 unsigned long dt
, db
;
6753 unsigned int per_milli
;
6755 if (mddev
->curr_resync
<= 3)
6758 resync
= mddev
->curr_resync
6759 - atomic_read(&mddev
->recovery_active
);
6761 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
6762 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
6763 max_sectors
= mddev
->resync_max_sectors
;
6765 max_sectors
= mddev
->dev_sectors
;
6767 WARN_ON(max_sectors
== 0);
6768 /* Pick 'scale' such that (resync>>scale)*1000 will fit
6769 * in a sector_t, and (max_sectors>>scale) will fit in a
6770 * u32, as those are the requirements for sector_div.
6771 * Thus 'scale' must be at least 10
6774 if (sizeof(sector_t
) > sizeof(unsigned long)) {
6775 while ( max_sectors
/2 > (1ULL<<(scale
+32)))
6778 res
= (resync
>>scale
)*1000;
6779 sector_div(res
, (u32
)((max_sectors
>>scale
)+1));
6783 int i
, x
= per_milli
/50, y
= 20-x
;
6784 seq_printf(seq
, "[");
6785 for (i
= 0; i
< x
; i
++)
6786 seq_printf(seq
, "=");
6787 seq_printf(seq
, ">");
6788 for (i
= 0; i
< y
; i
++)
6789 seq_printf(seq
, ".");
6790 seq_printf(seq
, "] ");
6792 seq_printf(seq
, " %s =%3u.%u%% (%llu/%llu)",
6793 (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)?
6795 (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)?
6797 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
6798 "resync" : "recovery"))),
6799 per_milli
/10, per_milli
% 10,
6800 (unsigned long long) resync
/2,
6801 (unsigned long long) max_sectors
/2);
6804 * dt: time from mark until now
6805 * db: blocks written from mark until now
6806 * rt: remaining time
6808 * rt is a sector_t, so could be 32bit or 64bit.
6809 * So we divide before multiply in case it is 32bit and close
6811 * We scale the divisor (db) by 32 to avoid losing precision
6812 * near the end of resync when the number of remaining sectors
6814 * We then divide rt by 32 after multiplying by db to compensate.
6815 * The '+1' avoids division by zero if db is very small.
6817 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
6819 db
= (mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
))
6820 - mddev
->resync_mark_cnt
;
6822 rt
= max_sectors
- resync
; /* number of remaining sectors */
6823 sector_div(rt
, db
/32+1);
6827 seq_printf(seq
, " finish=%lu.%lumin", (unsigned long)rt
/ 60,
6828 ((unsigned long)rt
% 60)/6);
6830 seq_printf(seq
, " speed=%ldK/sec", db
/2/dt
);
6833 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
6835 struct list_head
*tmp
;
6837 struct mddev
*mddev
;
6845 spin_lock(&all_mddevs_lock
);
6846 list_for_each(tmp
,&all_mddevs
)
6848 mddev
= list_entry(tmp
, struct mddev
, all_mddevs
);
6850 spin_unlock(&all_mddevs_lock
);
6853 spin_unlock(&all_mddevs_lock
);
6855 return (void*)2;/* tail */
6859 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
6861 struct list_head
*tmp
;
6862 struct mddev
*next_mddev
, *mddev
= v
;
6868 spin_lock(&all_mddevs_lock
);
6870 tmp
= all_mddevs
.next
;
6872 tmp
= mddev
->all_mddevs
.next
;
6873 if (tmp
!= &all_mddevs
)
6874 next_mddev
= mddev_get(list_entry(tmp
,struct mddev
,all_mddevs
));
6876 next_mddev
= (void*)2;
6879 spin_unlock(&all_mddevs_lock
);
6887 static void md_seq_stop(struct seq_file
*seq
, void *v
)
6889 struct mddev
*mddev
= v
;
6891 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
6895 static int md_seq_show(struct seq_file
*seq
, void *v
)
6897 struct mddev
*mddev
= v
;
6899 struct md_rdev
*rdev
;
6901 if (v
== (void*)1) {
6902 struct md_personality
*pers
;
6903 seq_printf(seq
, "Personalities : ");
6904 spin_lock(&pers_lock
);
6905 list_for_each_entry(pers
, &pers_list
, list
)
6906 seq_printf(seq
, "[%s] ", pers
->name
);
6908 spin_unlock(&pers_lock
);
6909 seq_printf(seq
, "\n");
6910 seq
->poll_event
= atomic_read(&md_event_count
);
6913 if (v
== (void*)2) {
6918 if (mddev_lock(mddev
) < 0)
6921 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
6922 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
6923 mddev
->pers
? "" : "in");
6926 seq_printf(seq
, " (read-only)");
6928 seq_printf(seq
, " (auto-read-only)");
6929 seq_printf(seq
, " %s", mddev
->pers
->name
);
6933 rdev_for_each(rdev
, mddev
) {
6934 char b
[BDEVNAME_SIZE
];
6935 seq_printf(seq
, " %s[%d]",
6936 bdevname(rdev
->bdev
,b
), rdev
->desc_nr
);
6937 if (test_bit(WriteMostly
, &rdev
->flags
))
6938 seq_printf(seq
, "(W)");
6939 if (test_bit(Faulty
, &rdev
->flags
)) {
6940 seq_printf(seq
, "(F)");
6943 if (rdev
->raid_disk
< 0)
6944 seq_printf(seq
, "(S)"); /* spare */
6945 if (test_bit(Replacement
, &rdev
->flags
))
6946 seq_printf(seq
, "(R)");
6947 sectors
+= rdev
->sectors
;
6950 if (!list_empty(&mddev
->disks
)) {
6952 seq_printf(seq
, "\n %llu blocks",
6953 (unsigned long long)
6954 mddev
->array_sectors
/ 2);
6956 seq_printf(seq
, "\n %llu blocks",
6957 (unsigned long long)sectors
/ 2);
6959 if (mddev
->persistent
) {
6960 if (mddev
->major_version
!= 0 ||
6961 mddev
->minor_version
!= 90) {
6962 seq_printf(seq
," super %d.%d",
6963 mddev
->major_version
,
6964 mddev
->minor_version
);
6966 } else if (mddev
->external
)
6967 seq_printf(seq
, " super external:%s",
6968 mddev
->metadata_type
);
6970 seq_printf(seq
, " super non-persistent");
6973 mddev
->pers
->status(seq
, mddev
);
6974 seq_printf(seq
, "\n ");
6975 if (mddev
->pers
->sync_request
) {
6976 if (mddev
->curr_resync
> 2) {
6977 status_resync(seq
, mddev
);
6978 seq_printf(seq
, "\n ");
6979 } else if (mddev
->curr_resync
>= 1)
6980 seq_printf(seq
, "\tresync=DELAYED\n ");
6981 else if (mddev
->recovery_cp
< MaxSector
)
6982 seq_printf(seq
, "\tresync=PENDING\n ");
6985 seq_printf(seq
, "\n ");
6987 bitmap_status(seq
, mddev
->bitmap
);
6989 seq_printf(seq
, "\n");
6991 mddev_unlock(mddev
);
6996 static const struct seq_operations md_seq_ops
= {
6997 .start
= md_seq_start
,
6998 .next
= md_seq_next
,
6999 .stop
= md_seq_stop
,
7000 .show
= md_seq_show
,
7003 static int md_seq_open(struct inode
*inode
, struct file
*file
)
7005 struct seq_file
*seq
;
7008 error
= seq_open(file
, &md_seq_ops
);
7012 seq
= file
->private_data
;
7013 seq
->poll_event
= atomic_read(&md_event_count
);
7017 static int md_unloading
;
7018 static unsigned int mdstat_poll(struct file
*filp
, poll_table
*wait
)
7020 struct seq_file
*seq
= filp
->private_data
;
7024 return POLLIN
|POLLRDNORM
|POLLERR
|POLLPRI
;
7025 poll_wait(filp
, &md_event_waiters
, wait
);
7027 /* always allow read */
7028 mask
= POLLIN
| POLLRDNORM
;
7030 if (seq
->poll_event
!= atomic_read(&md_event_count
))
7031 mask
|= POLLERR
| POLLPRI
;
7035 static const struct file_operations md_seq_fops
= {
7036 .owner
= THIS_MODULE
,
7037 .open
= md_seq_open
,
7039 .llseek
= seq_lseek
,
7040 .release
= seq_release_private
,
7041 .poll
= mdstat_poll
,
7044 int register_md_personality(struct md_personality
*p
)
7046 printk(KERN_INFO
"md: %s personality registered for level %d\n",
7048 spin_lock(&pers_lock
);
7049 list_add_tail(&p
->list
, &pers_list
);
7050 spin_unlock(&pers_lock
);
7053 EXPORT_SYMBOL(register_md_personality
);
7055 int unregister_md_personality(struct md_personality
*p
)
7057 printk(KERN_INFO
"md: %s personality unregistered\n", p
->name
);
7058 spin_lock(&pers_lock
);
7059 list_del_init(&p
->list
);
7060 spin_unlock(&pers_lock
);
7063 EXPORT_SYMBOL(unregister_md_personality
);
7065 static int is_mddev_idle(struct mddev
*mddev
, int init
)
7067 struct md_rdev
*rdev
;
7073 rdev_for_each_rcu(rdev
, mddev
) {
7074 struct gendisk
*disk
= rdev
->bdev
->bd_contains
->bd_disk
;
7075 curr_events
= (int)part_stat_read(&disk
->part0
, sectors
[0]) +
7076 (int)part_stat_read(&disk
->part0
, sectors
[1]) -
7077 atomic_read(&disk
->sync_io
);
7078 /* sync IO will cause sync_io to increase before the disk_stats
7079 * as sync_io is counted when a request starts, and
7080 * disk_stats is counted when it completes.
7081 * So resync activity will cause curr_events to be smaller than
7082 * when there was no such activity.
7083 * non-sync IO will cause disk_stat to increase without
7084 * increasing sync_io so curr_events will (eventually)
7085 * be larger than it was before. Once it becomes
7086 * substantially larger, the test below will cause
7087 * the array to appear non-idle, and resync will slow
7089 * If there is a lot of outstanding resync activity when
7090 * we set last_event to curr_events, then all that activity
7091 * completing might cause the array to appear non-idle
7092 * and resync will be slowed down even though there might
7093 * not have been non-resync activity. This will only
7094 * happen once though. 'last_events' will soon reflect
7095 * the state where there is little or no outstanding
7096 * resync requests, and further resync activity will
7097 * always make curr_events less than last_events.
7100 if (init
|| curr_events
- rdev
->last_events
> 64) {
7101 rdev
->last_events
= curr_events
;
7109 void md_done_sync(struct mddev
*mddev
, int blocks
, int ok
)
7111 /* another "blocks" (512byte) blocks have been synced */
7112 atomic_sub(blocks
, &mddev
->recovery_active
);
7113 wake_up(&mddev
->recovery_wait
);
7115 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7116 set_bit(MD_RECOVERY_ERROR
, &mddev
->recovery
);
7117 md_wakeup_thread(mddev
->thread
);
7118 // stop recovery, signal do_sync ....
7121 EXPORT_SYMBOL(md_done_sync
);
7123 /* md_write_start(mddev, bi)
7124 * If we need to update some array metadata (e.g. 'active' flag
7125 * in superblock) before writing, schedule a superblock update
7126 * and wait for it to complete.
7128 void md_write_start(struct mddev
*mddev
, struct bio
*bi
)
7131 if (bio_data_dir(bi
) != WRITE
)
7134 BUG_ON(mddev
->ro
== 1);
7135 if (mddev
->ro
== 2) {
7136 /* need to switch to read/write */
7138 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7139 md_wakeup_thread(mddev
->thread
);
7140 md_wakeup_thread(mddev
->sync_thread
);
7143 atomic_inc(&mddev
->writes_pending
);
7144 if (mddev
->safemode
== 1)
7145 mddev
->safemode
= 0;
7146 if (mddev
->in_sync
) {
7147 spin_lock(&mddev
->lock
);
7148 if (mddev
->in_sync
) {
7150 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7151 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
7152 md_wakeup_thread(mddev
->thread
);
7155 spin_unlock(&mddev
->lock
);
7158 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7159 wait_event(mddev
->sb_wait
,
7160 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
7162 EXPORT_SYMBOL(md_write_start
);
7164 void md_write_end(struct mddev
*mddev
)
7166 if (atomic_dec_and_test(&mddev
->writes_pending
)) {
7167 if (mddev
->safemode
== 2)
7168 md_wakeup_thread(mddev
->thread
);
7169 else if (mddev
->safemode_delay
)
7170 mod_timer(&mddev
->safemode_timer
, jiffies
+ mddev
->safemode_delay
);
7173 EXPORT_SYMBOL(md_write_end
);
7175 /* md_allow_write(mddev)
7176 * Calling this ensures that the array is marked 'active' so that writes
7177 * may proceed without blocking. It is important to call this before
7178 * attempting a GFP_KERNEL allocation while holding the mddev lock.
7179 * Must be called with mddev_lock held.
7181 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
7182 * is dropped, so return -EAGAIN after notifying userspace.
7184 int md_allow_write(struct mddev
*mddev
)
7190 if (!mddev
->pers
->sync_request
)
7193 spin_lock(&mddev
->lock
);
7194 if (mddev
->in_sync
) {
7196 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7197 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
7198 if (mddev
->safemode_delay
&&
7199 mddev
->safemode
== 0)
7200 mddev
->safemode
= 1;
7201 spin_unlock(&mddev
->lock
);
7202 md_update_sb(mddev
, 0);
7203 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7205 spin_unlock(&mddev
->lock
);
7207 if (test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
7212 EXPORT_SYMBOL_GPL(md_allow_write
);
7214 #define SYNC_MARKS 10
7215 #define SYNC_MARK_STEP (3*HZ)
7216 #define UPDATE_FREQUENCY (5*60*HZ)
7217 void md_do_sync(struct md_thread
*thread
)
7219 struct mddev
*mddev
= thread
->mddev
;
7220 struct mddev
*mddev2
;
7221 unsigned int currspeed
= 0,
7223 sector_t max_sectors
,j
, io_sectors
, recovery_done
;
7224 unsigned long mark
[SYNC_MARKS
];
7225 unsigned long update_time
;
7226 sector_t mark_cnt
[SYNC_MARKS
];
7228 struct list_head
*tmp
;
7229 sector_t last_check
;
7231 struct md_rdev
*rdev
;
7232 char *desc
, *action
= NULL
;
7233 struct blk_plug plug
;
7235 /* just incase thread restarts... */
7236 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
7238 if (mddev
->ro
) {/* never try to sync a read-only array */
7239 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7243 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7244 if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)) {
7245 desc
= "data-check";
7247 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
7248 desc
= "requested-resync";
7252 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
7257 mddev
->last_sync_action
= action
?: desc
;
7259 /* we overload curr_resync somewhat here.
7260 * 0 == not engaged in resync at all
7261 * 2 == checking that there is no conflict with another sync
7262 * 1 == like 2, but have yielded to allow conflicting resync to
7264 * other == active in resync - this many blocks
7266 * Before starting a resync we must have set curr_resync to
7267 * 2, and then checked that every "conflicting" array has curr_resync
7268 * less than ours. When we find one that is the same or higher
7269 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
7270 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
7271 * This will mean we have to start checking from the beginning again.
7276 mddev
->curr_resync
= 2;
7279 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7281 for_each_mddev(mddev2
, tmp
) {
7282 if (mddev2
== mddev
)
7284 if (!mddev
->parallel_resync
7285 && mddev2
->curr_resync
7286 && match_mddev_units(mddev
, mddev2
)) {
7288 if (mddev
< mddev2
&& mddev
->curr_resync
== 2) {
7289 /* arbitrarily yield */
7290 mddev
->curr_resync
= 1;
7291 wake_up(&resync_wait
);
7293 if (mddev
> mddev2
&& mddev
->curr_resync
== 1)
7294 /* no need to wait here, we can wait the next
7295 * time 'round when curr_resync == 2
7298 /* We need to wait 'interruptible' so as not to
7299 * contribute to the load average, and not to
7300 * be caught by 'softlockup'
7302 prepare_to_wait(&resync_wait
, &wq
, TASK_INTERRUPTIBLE
);
7303 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
7304 mddev2
->curr_resync
>= mddev
->curr_resync
) {
7305 printk(KERN_INFO
"md: delaying %s of %s"
7306 " until %s has finished (they"
7307 " share one or more physical units)\n",
7308 desc
, mdname(mddev
), mdname(mddev2
));
7310 if (signal_pending(current
))
7311 flush_signals(current
);
7313 finish_wait(&resync_wait
, &wq
);
7316 finish_wait(&resync_wait
, &wq
);
7319 } while (mddev
->curr_resync
< 2);
7322 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7323 /* resync follows the size requested by the personality,
7324 * which defaults to physical size, but can be virtual size
7326 max_sectors
= mddev
->resync_max_sectors
;
7327 atomic64_set(&mddev
->resync_mismatches
, 0);
7328 /* we don't use the checkpoint if there's a bitmap */
7329 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7330 j
= mddev
->resync_min
;
7331 else if (!mddev
->bitmap
)
7332 j
= mddev
->recovery_cp
;
7334 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
7335 max_sectors
= mddev
->resync_max_sectors
;
7337 /* recovery follows the physical size of devices */
7338 max_sectors
= mddev
->dev_sectors
;
7341 rdev_for_each_rcu(rdev
, mddev
)
7342 if (rdev
->raid_disk
>= 0 &&
7343 !test_bit(Faulty
, &rdev
->flags
) &&
7344 !test_bit(In_sync
, &rdev
->flags
) &&
7345 rdev
->recovery_offset
< j
)
7346 j
= rdev
->recovery_offset
;
7349 /* If there is a bitmap, we need to make sure all
7350 * writes that started before we added a spare
7351 * complete before we start doing a recovery.
7352 * Otherwise the write might complete and (via
7353 * bitmap_endwrite) set a bit in the bitmap after the
7354 * recovery has checked that bit and skipped that
7357 if (mddev
->bitmap
) {
7358 mddev
->pers
->quiesce(mddev
, 1);
7359 mddev
->pers
->quiesce(mddev
, 0);
7363 printk(KERN_INFO
"md: %s of RAID array %s\n", desc
, mdname(mddev
));
7364 printk(KERN_INFO
"md: minimum _guaranteed_ speed:"
7365 " %d KB/sec/disk.\n", speed_min(mddev
));
7366 printk(KERN_INFO
"md: using maximum available idle IO bandwidth "
7367 "(but not more than %d KB/sec) for %s.\n",
7368 speed_max(mddev
), desc
);
7370 is_mddev_idle(mddev
, 1); /* this initializes IO event counters */
7373 for (m
= 0; m
< SYNC_MARKS
; m
++) {
7375 mark_cnt
[m
] = io_sectors
;
7378 mddev
->resync_mark
= mark
[last_mark
];
7379 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
7382 * Tune reconstruction:
7384 window
= 32*(PAGE_SIZE
/512);
7385 printk(KERN_INFO
"md: using %dk window, over a total of %lluk.\n",
7386 window
/2, (unsigned long long)max_sectors
/2);
7388 atomic_set(&mddev
->recovery_active
, 0);
7393 "md: resuming %s of %s from checkpoint.\n",
7394 desc
, mdname(mddev
));
7395 mddev
->curr_resync
= j
;
7397 mddev
->curr_resync
= 3; /* no longer delayed */
7398 mddev
->curr_resync_completed
= j
;
7399 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
7400 md_new_event(mddev
);
7401 update_time
= jiffies
;
7403 blk_start_plug(&plug
);
7404 while (j
< max_sectors
) {
7409 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
7410 ((mddev
->curr_resync
> mddev
->curr_resync_completed
&&
7411 (mddev
->curr_resync
- mddev
->curr_resync_completed
)
7412 > (max_sectors
>> 4)) ||
7413 time_after_eq(jiffies
, update_time
+ UPDATE_FREQUENCY
) ||
7414 (j
- mddev
->curr_resync_completed
)*2
7415 >= mddev
->resync_max
- mddev
->curr_resync_completed
7417 /* time to update curr_resync_completed */
7418 wait_event(mddev
->recovery_wait
,
7419 atomic_read(&mddev
->recovery_active
) == 0);
7420 mddev
->curr_resync_completed
= j
;
7421 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) &&
7422 j
> mddev
->recovery_cp
)
7423 mddev
->recovery_cp
= j
;
7424 update_time
= jiffies
;
7425 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7426 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
7429 while (j
>= mddev
->resync_max
&&
7430 !test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
7431 /* As this condition is controlled by user-space,
7432 * we can block indefinitely, so use '_interruptible'
7433 * to avoid triggering warnings.
7435 flush_signals(current
); /* just in case */
7436 wait_event_interruptible(mddev
->recovery_wait
,
7437 mddev
->resync_max
> j
7438 || test_bit(MD_RECOVERY_INTR
,
7442 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7445 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
,
7446 currspeed
< speed_min(mddev
));
7448 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7452 if (!skipped
) { /* actual IO requested */
7453 io_sectors
+= sectors
;
7454 atomic_add(sectors
, &mddev
->recovery_active
);
7457 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7462 mddev
->curr_resync
= j
;
7463 mddev
->curr_mark_cnt
= io_sectors
;
7464 if (last_check
== 0)
7465 /* this is the earliest that rebuild will be
7466 * visible in /proc/mdstat
7468 md_new_event(mddev
);
7470 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
7473 last_check
= io_sectors
;
7475 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
7477 int next
= (last_mark
+1) % SYNC_MARKS
;
7479 mddev
->resync_mark
= mark
[next
];
7480 mddev
->resync_mark_cnt
= mark_cnt
[next
];
7481 mark
[next
] = jiffies
;
7482 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
7486 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7490 * this loop exits only if either when we are slower than
7491 * the 'hard' speed limit, or the system was IO-idle for
7493 * the system might be non-idle CPU-wise, but we only care
7494 * about not overloading the IO subsystem. (things like an
7495 * e2fsck being done on the RAID array should execute fast)
7499 recovery_done
= io_sectors
- atomic_read(&mddev
->recovery_active
);
7500 currspeed
= ((unsigned long)(recovery_done
- mddev
->resync_mark_cnt
))/2
7501 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
7503 if (currspeed
> speed_min(mddev
)) {
7504 if ((currspeed
> speed_max(mddev
)) ||
7505 !is_mddev_idle(mddev
, 0)) {
7511 printk(KERN_INFO
"md: %s: %s %s.\n",mdname(mddev
), desc
,
7512 test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)
7513 ? "interrupted" : "done");
7515 * this also signals 'finished resyncing' to md_stop
7517 blk_finish_plug(&plug
);
7518 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
7520 /* tell personality that we are finished */
7521 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
, 1);
7523 if (!test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
) &&
7524 mddev
->curr_resync
> 2) {
7525 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7526 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
7527 if (mddev
->curr_resync
>= mddev
->recovery_cp
) {
7529 "md: checkpointing %s of %s.\n",
7530 desc
, mdname(mddev
));
7531 if (test_bit(MD_RECOVERY_ERROR
,
7533 mddev
->recovery_cp
=
7534 mddev
->curr_resync_completed
;
7536 mddev
->recovery_cp
=
7540 mddev
->recovery_cp
= MaxSector
;
7542 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7543 mddev
->curr_resync
= MaxSector
;
7545 rdev_for_each_rcu(rdev
, mddev
)
7546 if (rdev
->raid_disk
>= 0 &&
7547 mddev
->delta_disks
>= 0 &&
7548 !test_bit(Faulty
, &rdev
->flags
) &&
7549 !test_bit(In_sync
, &rdev
->flags
) &&
7550 rdev
->recovery_offset
< mddev
->curr_resync
)
7551 rdev
->recovery_offset
= mddev
->curr_resync
;
7556 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7558 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
7559 /* We completed so min/max setting can be forgotten if used. */
7560 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7561 mddev
->resync_min
= 0;
7562 mddev
->resync_max
= MaxSector
;
7563 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7564 mddev
->resync_min
= mddev
->curr_resync_completed
;
7565 mddev
->curr_resync
= 0;
7566 wake_up(&resync_wait
);
7567 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
7568 md_wakeup_thread(mddev
->thread
);
7571 EXPORT_SYMBOL_GPL(md_do_sync
);
7573 static int remove_and_add_spares(struct mddev
*mddev
,
7574 struct md_rdev
*this)
7576 struct md_rdev
*rdev
;
7580 rdev_for_each(rdev
, mddev
)
7581 if ((this == NULL
|| rdev
== this) &&
7582 rdev
->raid_disk
>= 0 &&
7583 !test_bit(Blocked
, &rdev
->flags
) &&
7584 (test_bit(Faulty
, &rdev
->flags
) ||
7585 ! test_bit(In_sync
, &rdev
->flags
)) &&
7586 atomic_read(&rdev
->nr_pending
)==0) {
7587 if (mddev
->pers
->hot_remove_disk(
7588 mddev
, rdev
) == 0) {
7589 sysfs_unlink_rdev(mddev
, rdev
);
7590 rdev
->raid_disk
= -1;
7594 if (removed
&& mddev
->kobj
.sd
)
7595 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
7600 rdev_for_each(rdev
, mddev
) {
7601 if (rdev
->raid_disk
>= 0 &&
7602 !test_bit(In_sync
, &rdev
->flags
) &&
7603 !test_bit(Faulty
, &rdev
->flags
))
7605 if (rdev
->raid_disk
>= 0)
7607 if (test_bit(Faulty
, &rdev
->flags
))
7610 ! (rdev
->saved_raid_disk
>= 0 &&
7611 !test_bit(Bitmap_sync
, &rdev
->flags
)))
7614 if (rdev
->saved_raid_disk
< 0)
7615 rdev
->recovery_offset
= 0;
7617 hot_add_disk(mddev
, rdev
) == 0) {
7618 if (sysfs_link_rdev(mddev
, rdev
))
7619 /* failure here is OK */;
7621 md_new_event(mddev
);
7622 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7627 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7631 static void md_start_sync(struct work_struct
*ws
)
7633 struct mddev
*mddev
= container_of(ws
, struct mddev
, del_work
);
7635 mddev
->sync_thread
= md_register_thread(md_do_sync
,
7638 if (!mddev
->sync_thread
) {
7639 printk(KERN_ERR
"%s: could not start resync"
7642 /* leave the spares where they are, it shouldn't hurt */
7643 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7644 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
7645 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
7646 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
7647 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7648 wake_up(&resync_wait
);
7649 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
7651 if (mddev
->sysfs_action
)
7652 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7654 md_wakeup_thread(mddev
->sync_thread
);
7655 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7656 md_new_event(mddev
);
7660 * This routine is regularly called by all per-raid-array threads to
7661 * deal with generic issues like resync and super-block update.
7662 * Raid personalities that don't have a thread (linear/raid0) do not
7663 * need this as they never do any recovery or update the superblock.
7665 * It does not do any resync itself, but rather "forks" off other threads
7666 * to do that as needed.
7667 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
7668 * "->recovery" and create a thread at ->sync_thread.
7669 * When the thread finishes it sets MD_RECOVERY_DONE
7670 * and wakeups up this thread which will reap the thread and finish up.
7671 * This thread also removes any faulty devices (with nr_pending == 0).
7673 * The overall approach is:
7674 * 1/ if the superblock needs updating, update it.
7675 * 2/ If a recovery thread is running, don't do anything else.
7676 * 3/ If recovery has finished, clean up, possibly marking spares active.
7677 * 4/ If there are any faulty devices, remove them.
7678 * 5/ If array is degraded, try to add spares devices
7679 * 6/ If array has spares or is not in-sync, start a resync thread.
7681 void md_check_recovery(struct mddev
*mddev
)
7683 if (mddev
->suspended
)
7687 bitmap_daemon_work(mddev
);
7689 if (signal_pending(current
)) {
7690 if (mddev
->pers
->sync_request
&& !mddev
->external
) {
7691 printk(KERN_INFO
"md: %s in immediate safe mode\n",
7693 mddev
->safemode
= 2;
7695 flush_signals(current
);
7698 if (mddev
->ro
&& !test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
7701 (mddev
->flags
& MD_UPDATE_SB_FLAGS
& ~ (1<<MD_CHANGE_PENDING
)) ||
7702 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
7703 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
7704 (mddev
->external
== 0 && mddev
->safemode
== 1) ||
7705 (mddev
->safemode
== 2 && ! atomic_read(&mddev
->writes_pending
)
7706 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
7710 if (mddev_trylock(mddev
)) {
7714 /* On a read-only array we can:
7715 * - remove failed devices
7716 * - add already-in_sync devices if the array itself
7718 * As we only add devices that are already in-sync,
7719 * we can activate the spares immediately.
7721 remove_and_add_spares(mddev
, NULL
);
7722 /* There is no thread, but we need to call
7723 * ->spare_active and clear saved_raid_disk
7725 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7726 md_reap_sync_thread(mddev
);
7727 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7731 if (!mddev
->external
) {
7733 spin_lock(&mddev
->lock
);
7734 if (mddev
->safemode
&&
7735 !atomic_read(&mddev
->writes_pending
) &&
7737 mddev
->recovery_cp
== MaxSector
) {
7740 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7742 if (mddev
->safemode
== 1)
7743 mddev
->safemode
= 0;
7744 spin_unlock(&mddev
->lock
);
7746 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7749 if (mddev
->flags
& MD_UPDATE_SB_FLAGS
)
7750 md_update_sb(mddev
, 0);
7752 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
7753 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
7754 /* resync/recovery still happening */
7755 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7758 if (mddev
->sync_thread
) {
7759 md_reap_sync_thread(mddev
);
7762 /* Set RUNNING before clearing NEEDED to avoid
7763 * any transients in the value of "sync_action".
7765 mddev
->curr_resync_completed
= 0;
7766 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7767 /* Clear some bits that don't mean anything, but
7770 clear_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7771 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
7773 if (!test_and_clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
7774 test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
7776 /* no recovery is running.
7777 * remove any failed drives, then
7778 * add spares if possible.
7779 * Spares are also removed and re-added, to allow
7780 * the personality to fail the re-add.
7783 if (mddev
->reshape_position
!= MaxSector
) {
7784 if (mddev
->pers
->check_reshape
== NULL
||
7785 mddev
->pers
->check_reshape(mddev
) != 0)
7786 /* Cannot proceed */
7788 set_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
7789 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7790 } else if ((spares
= remove_and_add_spares(mddev
, NULL
))) {
7791 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7792 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
7793 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
7794 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7795 } else if (mddev
->recovery_cp
< MaxSector
) {
7796 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7797 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7798 } else if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
7799 /* nothing to be done ... */
7802 if (mddev
->pers
->sync_request
) {
7804 /* We are adding a device or devices to an array
7805 * which has the bitmap stored on all devices.
7806 * So make sure all bitmap pages get written
7808 bitmap_write_all(mddev
->bitmap
);
7810 INIT_WORK(&mddev
->del_work
, md_start_sync
);
7811 queue_work(md_misc_wq
, &mddev
->del_work
);
7815 if (!mddev
->sync_thread
) {
7816 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7817 wake_up(&resync_wait
);
7818 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
7820 if (mddev
->sysfs_action
)
7821 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7824 wake_up(&mddev
->sb_wait
);
7825 mddev_unlock(mddev
);
7828 EXPORT_SYMBOL(md_check_recovery
);
7830 void md_reap_sync_thread(struct mddev
*mddev
)
7832 struct md_rdev
*rdev
;
7834 /* resync has finished, collect result */
7835 md_unregister_thread(&mddev
->sync_thread
);
7836 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
7837 !test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
7839 /* activate any spares */
7840 if (mddev
->pers
->spare_active(mddev
)) {
7841 sysfs_notify(&mddev
->kobj
, NULL
,
7843 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7846 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
7847 mddev
->pers
->finish_reshape
)
7848 mddev
->pers
->finish_reshape(mddev
);
7850 /* If array is no-longer degraded, then any saved_raid_disk
7851 * information must be scrapped.
7853 if (!mddev
->degraded
)
7854 rdev_for_each(rdev
, mddev
)
7855 rdev
->saved_raid_disk
= -1;
7857 md_update_sb(mddev
, 1);
7858 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7859 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7860 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
7861 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
7862 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
7863 wake_up(&resync_wait
);
7864 /* flag recovery needed just to double check */
7865 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7866 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7867 md_new_event(mddev
);
7868 if (mddev
->event_work
.func
)
7869 queue_work(md_misc_wq
, &mddev
->event_work
);
7871 EXPORT_SYMBOL(md_reap_sync_thread
);
7873 void md_wait_for_blocked_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
7875 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
7876 wait_event_timeout(rdev
->blocked_wait
,
7877 !test_bit(Blocked
, &rdev
->flags
) &&
7878 !test_bit(BlockedBadBlocks
, &rdev
->flags
),
7879 msecs_to_jiffies(5000));
7880 rdev_dec_pending(rdev
, mddev
);
7882 EXPORT_SYMBOL(md_wait_for_blocked_rdev
);
7884 void md_finish_reshape(struct mddev
*mddev
)
7886 /* called be personality module when reshape completes. */
7887 struct md_rdev
*rdev
;
7889 rdev_for_each(rdev
, mddev
) {
7890 if (rdev
->data_offset
> rdev
->new_data_offset
)
7891 rdev
->sectors
+= rdev
->data_offset
- rdev
->new_data_offset
;
7893 rdev
->sectors
-= rdev
->new_data_offset
- rdev
->data_offset
;
7894 rdev
->data_offset
= rdev
->new_data_offset
;
7897 EXPORT_SYMBOL(md_finish_reshape
);
7899 /* Bad block management.
7900 * We can record which blocks on each device are 'bad' and so just
7901 * fail those blocks, or that stripe, rather than the whole device.
7902 * Entries in the bad-block table are 64bits wide. This comprises:
7903 * Length of bad-range, in sectors: 0-511 for lengths 1-512
7904 * Start of bad-range, sector offset, 54 bits (allows 8 exbibytes)
7905 * A 'shift' can be set so that larger blocks are tracked and
7906 * consequently larger devices can be covered.
7907 * 'Acknowledged' flag - 1 bit. - the most significant bit.
7909 * Locking of the bad-block table uses a seqlock so md_is_badblock
7910 * might need to retry if it is very unlucky.
7911 * We will sometimes want to check for bad blocks in a bi_end_io function,
7912 * so we use the write_seqlock_irq variant.
7914 * When looking for a bad block we specify a range and want to
7915 * know if any block in the range is bad. So we binary-search
7916 * to the last range that starts at-or-before the given endpoint,
7917 * (or "before the sector after the target range")
7918 * then see if it ends after the given start.
7920 * 0 if there are no known bad blocks in the range
7921 * 1 if there are known bad block which are all acknowledged
7922 * -1 if there are bad blocks which have not yet been acknowledged in metadata.
7923 * plus the start/length of the first bad section we overlap.
7925 int md_is_badblock(struct badblocks
*bb
, sector_t s
, int sectors
,
7926 sector_t
*first_bad
, int *bad_sectors
)
7932 sector_t target
= s
+ sectors
;
7935 if (bb
->shift
> 0) {
7936 /* round the start down, and the end up */
7938 target
+= (1<<bb
->shift
) - 1;
7939 target
>>= bb
->shift
;
7940 sectors
= target
- s
;
7942 /* 'target' is now the first block after the bad range */
7945 seq
= read_seqbegin(&bb
->lock
);
7950 /* Binary search between lo and hi for 'target'
7951 * i.e. for the last range that starts before 'target'
7953 /* INVARIANT: ranges before 'lo' and at-or-after 'hi'
7954 * are known not to be the last range before target.
7955 * VARIANT: hi-lo is the number of possible
7956 * ranges, and decreases until it reaches 1
7958 while (hi
- lo
> 1) {
7959 int mid
= (lo
+ hi
) / 2;
7960 sector_t a
= BB_OFFSET(p
[mid
]);
7962 /* This could still be the one, earlier ranges
7966 /* This and later ranges are definitely out. */
7969 /* 'lo' might be the last that started before target, but 'hi' isn't */
7971 /* need to check all range that end after 's' to see if
7972 * any are unacknowledged.
7975 BB_OFFSET(p
[lo
]) + BB_LEN(p
[lo
]) > s
) {
7976 if (BB_OFFSET(p
[lo
]) < target
) {
7977 /* starts before the end, and finishes after
7978 * the start, so they must overlap
7980 if (rv
!= -1 && BB_ACK(p
[lo
]))
7984 *first_bad
= BB_OFFSET(p
[lo
]);
7985 *bad_sectors
= BB_LEN(p
[lo
]);
7991 if (read_seqretry(&bb
->lock
, seq
))
7996 EXPORT_SYMBOL_GPL(md_is_badblock
);
7999 * Add a range of bad blocks to the table.
8000 * This might extend the table, or might contract it
8001 * if two adjacent ranges can be merged.
8002 * We binary-search to find the 'insertion' point, then
8003 * decide how best to handle it.
8005 static int md_set_badblocks(struct badblocks
*bb
, sector_t s
, int sectors
,
8011 unsigned long flags
;
8014 /* badblocks are disabled */
8018 /* round the start down, and the end up */
8019 sector_t next
= s
+ sectors
;
8021 next
+= (1<<bb
->shift
) - 1;
8026 write_seqlock_irqsave(&bb
->lock
, flags
);
8031 /* Find the last range that starts at-or-before 's' */
8032 while (hi
- lo
> 1) {
8033 int mid
= (lo
+ hi
) / 2;
8034 sector_t a
= BB_OFFSET(p
[mid
]);
8040 if (hi
> lo
&& BB_OFFSET(p
[lo
]) > s
)
8044 /* we found a range that might merge with the start
8047 sector_t a
= BB_OFFSET(p
[lo
]);
8048 sector_t e
= a
+ BB_LEN(p
[lo
]);
8049 int ack
= BB_ACK(p
[lo
]);
8051 /* Yes, we can merge with a previous range */
8052 if (s
== a
&& s
+ sectors
>= e
)
8053 /* new range covers old */
8056 ack
= ack
&& acknowledged
;
8058 if (e
< s
+ sectors
)
8060 if (e
- a
<= BB_MAX_LEN
) {
8061 p
[lo
] = BB_MAKE(a
, e
-a
, ack
);
8064 /* does not all fit in one range,
8065 * make p[lo] maximal
8067 if (BB_LEN(p
[lo
]) != BB_MAX_LEN
)
8068 p
[lo
] = BB_MAKE(a
, BB_MAX_LEN
, ack
);
8074 if (sectors
&& hi
< bb
->count
) {
8075 /* 'hi' points to the first range that starts after 's'.
8076 * Maybe we can merge with the start of that range */
8077 sector_t a
= BB_OFFSET(p
[hi
]);
8078 sector_t e
= a
+ BB_LEN(p
[hi
]);
8079 int ack
= BB_ACK(p
[hi
]);
8080 if (a
<= s
+ sectors
) {
8081 /* merging is possible */
8082 if (e
<= s
+ sectors
) {
8087 ack
= ack
&& acknowledged
;
8090 if (e
- a
<= BB_MAX_LEN
) {
8091 p
[hi
] = BB_MAKE(a
, e
-a
, ack
);
8094 p
[hi
] = BB_MAKE(a
, BB_MAX_LEN
, ack
);
8102 if (sectors
== 0 && hi
< bb
->count
) {
8103 /* we might be able to combine lo and hi */
8104 /* Note: 's' is at the end of 'lo' */
8105 sector_t a
= BB_OFFSET(p
[hi
]);
8106 int lolen
= BB_LEN(p
[lo
]);
8107 int hilen
= BB_LEN(p
[hi
]);
8108 int newlen
= lolen
+ hilen
- (s
- a
);
8109 if (s
>= a
&& newlen
< BB_MAX_LEN
) {
8110 /* yes, we can combine them */
8111 int ack
= BB_ACK(p
[lo
]) && BB_ACK(p
[hi
]);
8112 p
[lo
] = BB_MAKE(BB_OFFSET(p
[lo
]), newlen
, ack
);
8113 memmove(p
+ hi
, p
+ hi
+ 1,
8114 (bb
->count
- hi
- 1) * 8);
8119 /* didn't merge (it all).
8120 * Need to add a range just before 'hi' */
8121 if (bb
->count
>= MD_MAX_BADBLOCKS
) {
8122 /* No room for more */
8126 int this_sectors
= sectors
;
8127 memmove(p
+ hi
+ 1, p
+ hi
,
8128 (bb
->count
- hi
) * 8);
8131 if (this_sectors
> BB_MAX_LEN
)
8132 this_sectors
= BB_MAX_LEN
;
8133 p
[hi
] = BB_MAKE(s
, this_sectors
, acknowledged
);
8134 sectors
-= this_sectors
;
8141 bb
->unacked_exist
= 1;
8142 write_sequnlock_irqrestore(&bb
->lock
, flags
);
8147 int rdev_set_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
8152 s
+= rdev
->new_data_offset
;
8154 s
+= rdev
->data_offset
;
8155 rv
= md_set_badblocks(&rdev
->badblocks
,
8158 /* Make sure they get written out promptly */
8159 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
8160 set_bit(MD_CHANGE_CLEAN
, &rdev
->mddev
->flags
);
8161 md_wakeup_thread(rdev
->mddev
->thread
);
8165 EXPORT_SYMBOL_GPL(rdev_set_badblocks
);
8168 * Remove a range of bad blocks from the table.
8169 * This may involve extending the table if we spilt a region,
8170 * but it must not fail. So if the table becomes full, we just
8171 * drop the remove request.
8173 static int md_clear_badblocks(struct badblocks
*bb
, sector_t s
, int sectors
)
8177 sector_t target
= s
+ sectors
;
8180 if (bb
->shift
> 0) {
8181 /* When clearing we round the start up and the end down.
8182 * This should not matter as the shift should align with
8183 * the block size and no rounding should ever be needed.
8184 * However it is better the think a block is bad when it
8185 * isn't than to think a block is not bad when it is.
8187 s
+= (1<<bb
->shift
) - 1;
8189 target
>>= bb
->shift
;
8190 sectors
= target
- s
;
8193 write_seqlock_irq(&bb
->lock
);
8198 /* Find the last range that starts before 'target' */
8199 while (hi
- lo
> 1) {
8200 int mid
= (lo
+ hi
) / 2;
8201 sector_t a
= BB_OFFSET(p
[mid
]);
8208 /* p[lo] is the last range that could overlap the
8209 * current range. Earlier ranges could also overlap,
8210 * but only this one can overlap the end of the range.
8212 if (BB_OFFSET(p
[lo
]) + BB_LEN(p
[lo
]) > target
) {
8213 /* Partial overlap, leave the tail of this range */
8214 int ack
= BB_ACK(p
[lo
]);
8215 sector_t a
= BB_OFFSET(p
[lo
]);
8216 sector_t end
= a
+ BB_LEN(p
[lo
]);
8219 /* we need to split this range */
8220 if (bb
->count
>= MD_MAX_BADBLOCKS
) {
8224 memmove(p
+lo
+1, p
+lo
, (bb
->count
- lo
) * 8);
8226 p
[lo
] = BB_MAKE(a
, s
-a
, ack
);
8229 p
[lo
] = BB_MAKE(target
, end
- target
, ack
);
8230 /* there is no longer an overlap */
8235 BB_OFFSET(p
[lo
]) + BB_LEN(p
[lo
]) > s
) {
8236 /* This range does overlap */
8237 if (BB_OFFSET(p
[lo
]) < s
) {
8238 /* Keep the early parts of this range. */
8239 int ack
= BB_ACK(p
[lo
]);
8240 sector_t start
= BB_OFFSET(p
[lo
]);
8241 p
[lo
] = BB_MAKE(start
, s
- start
, ack
);
8242 /* now low doesn't overlap, so.. */
8247 /* 'lo' is strictly before, 'hi' is strictly after,
8248 * anything between needs to be discarded
8251 memmove(p
+lo
+1, p
+hi
, (bb
->count
- hi
) * 8);
8252 bb
->count
-= (hi
- lo
- 1);
8258 write_sequnlock_irq(&bb
->lock
);
8262 int rdev_clear_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
8266 s
+= rdev
->new_data_offset
;
8268 s
+= rdev
->data_offset
;
8269 return md_clear_badblocks(&rdev
->badblocks
,
8272 EXPORT_SYMBOL_GPL(rdev_clear_badblocks
);
8275 * Acknowledge all bad blocks in a list.
8276 * This only succeeds if ->changed is clear. It is used by
8277 * in-kernel metadata updates
8279 void md_ack_all_badblocks(struct badblocks
*bb
)
8281 if (bb
->page
== NULL
|| bb
->changed
)
8282 /* no point even trying */
8284 write_seqlock_irq(&bb
->lock
);
8286 if (bb
->changed
== 0 && bb
->unacked_exist
) {
8289 for (i
= 0; i
< bb
->count
; i
++) {
8290 if (!BB_ACK(p
[i
])) {
8291 sector_t start
= BB_OFFSET(p
[i
]);
8292 int len
= BB_LEN(p
[i
]);
8293 p
[i
] = BB_MAKE(start
, len
, 1);
8296 bb
->unacked_exist
= 0;
8298 write_sequnlock_irq(&bb
->lock
);
8300 EXPORT_SYMBOL_GPL(md_ack_all_badblocks
);
8302 /* sysfs access to bad-blocks list.
8303 * We present two files.
8304 * 'bad-blocks' lists sector numbers and lengths of ranges that
8305 * are recorded as bad. The list is truncated to fit within
8306 * the one-page limit of sysfs.
8307 * Writing "sector length" to this file adds an acknowledged
8309 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
8310 * been acknowledged. Writing to this file adds bad blocks
8311 * without acknowledging them. This is largely for testing.
8315 badblocks_show(struct badblocks
*bb
, char *page
, int unack
)
8326 seq
= read_seqbegin(&bb
->lock
);
8331 while (len
< PAGE_SIZE
&& i
< bb
->count
) {
8332 sector_t s
= BB_OFFSET(p
[i
]);
8333 unsigned int length
= BB_LEN(p
[i
]);
8334 int ack
= BB_ACK(p
[i
]);
8340 len
+= snprintf(page
+len
, PAGE_SIZE
-len
, "%llu %u\n",
8341 (unsigned long long)s
<< bb
->shift
,
8342 length
<< bb
->shift
);
8344 if (unack
&& len
== 0)
8345 bb
->unacked_exist
= 0;
8347 if (read_seqretry(&bb
->lock
, seq
))
8356 badblocks_store(struct badblocks
*bb
, const char *page
, size_t len
, int unack
)
8358 unsigned long long sector
;
8362 /* Allow clearing via sysfs *only* for testing/debugging.
8363 * Normally only a successful write may clear a badblock
8366 if (page
[0] == '-') {
8370 #endif /* DO_DEBUG */
8372 switch (sscanf(page
, "%llu %d%c", §or
, &length
, &newline
)) {
8374 if (newline
!= '\n')
8386 md_clear_badblocks(bb
, sector
, length
);
8389 #endif /* DO_DEBUG */
8390 if (md_set_badblocks(bb
, sector
, length
, !unack
))
8396 static int md_notify_reboot(struct notifier_block
*this,
8397 unsigned long code
, void *x
)
8399 struct list_head
*tmp
;
8400 struct mddev
*mddev
;
8403 for_each_mddev(mddev
, tmp
) {
8404 if (mddev_trylock(mddev
)) {
8406 __md_stop_writes(mddev
);
8407 if (mddev
->persistent
)
8408 mddev
->safemode
= 2;
8409 mddev_unlock(mddev
);
8414 * certain more exotic SCSI devices are known to be
8415 * volatile wrt too early system reboots. While the
8416 * right place to handle this issue is the given
8417 * driver, we do want to have a safe RAID driver ...
8425 static struct notifier_block md_notifier
= {
8426 .notifier_call
= md_notify_reboot
,
8428 .priority
= INT_MAX
, /* before any real devices */
8431 static void md_geninit(void)
8433 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
8435 proc_create("mdstat", S_IRUGO
, NULL
, &md_seq_fops
);
8438 static int __init
md_init(void)
8442 md_wq
= alloc_workqueue("md", WQ_MEM_RECLAIM
, 0);
8446 md_misc_wq
= alloc_workqueue("md_misc", 0, 0);
8450 if ((ret
= register_blkdev(MD_MAJOR
, "md")) < 0)
8453 if ((ret
= register_blkdev(0, "mdp")) < 0)
8457 blk_register_region(MKDEV(MD_MAJOR
, 0), 512, THIS_MODULE
,
8458 md_probe
, NULL
, NULL
);
8459 blk_register_region(MKDEV(mdp_major
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
8460 md_probe
, NULL
, NULL
);
8462 register_reboot_notifier(&md_notifier
);
8463 raid_table_header
= register_sysctl_table(raid_root_table
);
8469 unregister_blkdev(MD_MAJOR
, "md");
8471 destroy_workqueue(md_misc_wq
);
8473 destroy_workqueue(md_wq
);
8481 * Searches all registered partitions for autorun RAID arrays
8485 static LIST_HEAD(all_detected_devices
);
8486 struct detected_devices_node
{
8487 struct list_head list
;
8491 void md_autodetect_dev(dev_t dev
)
8493 struct detected_devices_node
*node_detected_dev
;
8495 node_detected_dev
= kzalloc(sizeof(*node_detected_dev
), GFP_KERNEL
);
8496 if (node_detected_dev
) {
8497 node_detected_dev
->dev
= dev
;
8498 list_add_tail(&node_detected_dev
->list
, &all_detected_devices
);
8500 printk(KERN_CRIT
"md: md_autodetect_dev: kzalloc failed"
8501 ", skipping dev(%d,%d)\n", MAJOR(dev
), MINOR(dev
));
8505 static void autostart_arrays(int part
)
8507 struct md_rdev
*rdev
;
8508 struct detected_devices_node
*node_detected_dev
;
8510 int i_scanned
, i_passed
;
8515 printk(KERN_INFO
"md: Autodetecting RAID arrays.\n");
8517 while (!list_empty(&all_detected_devices
) && i_scanned
< INT_MAX
) {
8519 node_detected_dev
= list_entry(all_detected_devices
.next
,
8520 struct detected_devices_node
, list
);
8521 list_del(&node_detected_dev
->list
);
8522 dev
= node_detected_dev
->dev
;
8523 kfree(node_detected_dev
);
8524 rdev
= md_import_device(dev
,0, 90);
8528 if (test_bit(Faulty
, &rdev
->flags
))
8531 set_bit(AutoDetected
, &rdev
->flags
);
8532 list_add(&rdev
->same_set
, &pending_raid_disks
);
8536 printk(KERN_INFO
"md: Scanned %d and added %d devices.\n",
8537 i_scanned
, i_passed
);
8539 autorun_devices(part
);
8542 #endif /* !MODULE */
8544 static __exit
void md_exit(void)
8546 struct mddev
*mddev
;
8547 struct list_head
*tmp
;
8550 blk_unregister_region(MKDEV(MD_MAJOR
,0), 512);
8551 blk_unregister_region(MKDEV(mdp_major
,0), 1U << MINORBITS
);
8553 unregister_blkdev(MD_MAJOR
,"md");
8554 unregister_blkdev(mdp_major
, "mdp");
8555 unregister_reboot_notifier(&md_notifier
);
8556 unregister_sysctl_table(raid_table_header
);
8558 /* We cannot unload the modules while some process is
8559 * waiting for us in select() or poll() - wake them up
8562 while (waitqueue_active(&md_event_waiters
)) {
8563 /* not safe to leave yet */
8564 wake_up(&md_event_waiters
);
8568 remove_proc_entry("mdstat", NULL
);
8570 for_each_mddev(mddev
, tmp
) {
8571 export_array(mddev
);
8572 mddev
->hold_active
= 0;
8574 destroy_workqueue(md_misc_wq
);
8575 destroy_workqueue(md_wq
);
8578 subsys_initcall(md_init
);
8579 module_exit(md_exit
)
8581 static int get_ro(char *buffer
, struct kernel_param
*kp
)
8583 return sprintf(buffer
, "%d", start_readonly
);
8585 static int set_ro(const char *val
, struct kernel_param
*kp
)
8588 int num
= simple_strtoul(val
, &e
, 10);
8589 if (*val
&& (*e
== '\0' || *e
== '\n')) {
8590 start_readonly
= num
;
8596 module_param_call(start_ro
, set_ro
, get_ro
, NULL
, S_IRUSR
|S_IWUSR
);
8597 module_param(start_dirty_degraded
, int, S_IRUGO
|S_IWUSR
);
8598 module_param_call(new_array
, add_named_array
, NULL
, NULL
, S_IWUSR
);
8600 MODULE_LICENSE("GPL");
8601 MODULE_DESCRIPTION("MD RAID framework");
8603 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);