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 void md_print_devices(void);
71 static DECLARE_WAIT_QUEUE_HEAD(resync_wait
);
72 static struct workqueue_struct
*md_wq
;
73 static struct workqueue_struct
*md_misc_wq
;
75 static int remove_and_add_spares(struct mddev
*mddev
,
76 struct md_rdev
*this);
78 #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
81 * Default number of read corrections we'll attempt on an rdev
82 * before ejecting it from the array. We divide the read error
83 * count by 2 for every hour elapsed between read errors.
85 #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
87 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
88 * is 1000 KB/sec, so the extra system load does not show up that much.
89 * Increase it if you want to have more _guaranteed_ speed. Note that
90 * the RAID driver will use the maximum available bandwidth if the IO
91 * subsystem is idle. There is also an 'absolute maximum' reconstruction
92 * speed limit - in case reconstruction slows down your system despite
95 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
96 * or /sys/block/mdX/md/sync_speed_{min,max}
99 static int sysctl_speed_limit_min
= 1000;
100 static int sysctl_speed_limit_max
= 200000;
101 static inline int speed_min(struct mddev
*mddev
)
103 return mddev
->sync_speed_min
?
104 mddev
->sync_speed_min
: sysctl_speed_limit_min
;
107 static inline int speed_max(struct mddev
*mddev
)
109 return mddev
->sync_speed_max
?
110 mddev
->sync_speed_max
: sysctl_speed_limit_max
;
113 static struct ctl_table_header
*raid_table_header
;
115 static ctl_table raid_table
[] = {
117 .procname
= "speed_limit_min",
118 .data
= &sysctl_speed_limit_min
,
119 .maxlen
= sizeof(int),
120 .mode
= S_IRUGO
|S_IWUSR
,
121 .proc_handler
= proc_dointvec
,
124 .procname
= "speed_limit_max",
125 .data
= &sysctl_speed_limit_max
,
126 .maxlen
= sizeof(int),
127 .mode
= S_IRUGO
|S_IWUSR
,
128 .proc_handler
= proc_dointvec
,
133 static ctl_table raid_dir_table
[] = {
137 .mode
= S_IRUGO
|S_IXUGO
,
143 static ctl_table raid_root_table
[] = {
148 .child
= raid_dir_table
,
153 static const struct block_device_operations md_fops
;
155 static int start_readonly
;
158 * like bio_clone, but with a local bio set
161 struct bio
*bio_alloc_mddev(gfp_t gfp_mask
, int nr_iovecs
,
166 if (!mddev
|| !mddev
->bio_set
)
167 return bio_alloc(gfp_mask
, nr_iovecs
);
169 b
= bio_alloc_bioset(gfp_mask
, nr_iovecs
, mddev
->bio_set
);
174 EXPORT_SYMBOL_GPL(bio_alloc_mddev
);
176 struct bio
*bio_clone_mddev(struct bio
*bio
, gfp_t gfp_mask
,
179 if (!mddev
|| !mddev
->bio_set
)
180 return bio_clone(bio
, gfp_mask
);
182 return bio_clone_bioset(bio
, gfp_mask
, mddev
->bio_set
);
184 EXPORT_SYMBOL_GPL(bio_clone_mddev
);
186 void md_trim_bio(struct bio
*bio
, int offset
, int size
)
188 /* 'bio' is a cloned bio which we need to trim to match
189 * the given offset and size.
190 * This requires adjusting bi_sector, bi_size, and bi_io_vec
193 struct bio_vec
*bvec
;
197 if (offset
== 0 && size
== bio
->bi_size
)
200 clear_bit(BIO_SEG_VALID
, &bio
->bi_flags
);
202 bio_advance(bio
, offset
<< 9);
206 /* avoid any complications with bi_idx being non-zero*/
208 memmove(bio
->bi_io_vec
, bio
->bi_io_vec
+bio
->bi_idx
,
209 (bio
->bi_vcnt
- bio
->bi_idx
) * sizeof(struct bio_vec
));
210 bio
->bi_vcnt
-= bio
->bi_idx
;
213 /* Make sure vcnt and last bv are not too big */
214 bio_for_each_segment(bvec
, bio
, i
) {
215 if (sofar
+ bvec
->bv_len
> size
)
216 bvec
->bv_len
= size
- sofar
;
217 if (bvec
->bv_len
== 0) {
221 sofar
+= bvec
->bv_len
;
224 EXPORT_SYMBOL_GPL(md_trim_bio
);
227 * We have a system wide 'event count' that is incremented
228 * on any 'interesting' event, and readers of /proc/mdstat
229 * can use 'poll' or 'select' to find out when the event
233 * start array, stop array, error, add device, remove device,
234 * start build, activate spare
236 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters
);
237 static atomic_t md_event_count
;
238 void md_new_event(struct mddev
*mddev
)
240 atomic_inc(&md_event_count
);
241 wake_up(&md_event_waiters
);
243 EXPORT_SYMBOL_GPL(md_new_event
);
245 /* Alternate version that can be called from interrupts
246 * when calling sysfs_notify isn't needed.
248 static void md_new_event_inintr(struct mddev
*mddev
)
250 atomic_inc(&md_event_count
);
251 wake_up(&md_event_waiters
);
255 * Enables to iterate over all existing md arrays
256 * all_mddevs_lock protects this list.
258 static LIST_HEAD(all_mddevs
);
259 static DEFINE_SPINLOCK(all_mddevs_lock
);
263 * iterates through all used mddevs in the system.
264 * We take care to grab the all_mddevs_lock whenever navigating
265 * the list, and to always hold a refcount when unlocked.
266 * Any code which breaks out of this loop while own
267 * a reference to the current mddev and must mddev_put it.
269 #define for_each_mddev(_mddev,_tmp) \
271 for (({ spin_lock(&all_mddevs_lock); \
272 _tmp = all_mddevs.next; \
274 ({ if (_tmp != &all_mddevs) \
275 mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\
276 spin_unlock(&all_mddevs_lock); \
277 if (_mddev) mddev_put(_mddev); \
278 _mddev = list_entry(_tmp, struct mddev, all_mddevs); \
279 _tmp != &all_mddevs;}); \
280 ({ spin_lock(&all_mddevs_lock); \
281 _tmp = _tmp->next;}) \
285 /* Rather than calling directly into the personality make_request function,
286 * IO requests come here first so that we can check if the device is
287 * being suspended pending a reconfiguration.
288 * We hold a refcount over the call to ->make_request. By the time that
289 * call has finished, the bio has been linked into some internal structure
290 * and so is visible to ->quiesce(), so we don't need the refcount any more.
292 static void md_make_request(struct request_queue
*q
, struct bio
*bio
)
294 const int rw
= bio_data_dir(bio
);
295 struct mddev
*mddev
= q
->queuedata
;
297 unsigned int sectors
;
299 if (mddev
== NULL
|| mddev
->pers
== NULL
304 if (mddev
->ro
== 1 && unlikely(rw
== WRITE
)) {
305 bio_endio(bio
, bio_sectors(bio
) == 0 ? 0 : -EROFS
);
308 smp_rmb(); /* Ensure implications of 'active' are visible */
310 if (mddev
->suspended
) {
313 prepare_to_wait(&mddev
->sb_wait
, &__wait
,
314 TASK_UNINTERRUPTIBLE
);
315 if (!mddev
->suspended
)
321 finish_wait(&mddev
->sb_wait
, &__wait
);
323 atomic_inc(&mddev
->active_io
);
327 * save the sectors now since our bio can
328 * go away inside make_request
330 sectors
= bio_sectors(bio
);
331 mddev
->pers
->make_request(mddev
, bio
);
333 cpu
= part_stat_lock();
334 part_stat_inc(cpu
, &mddev
->gendisk
->part0
, ios
[rw
]);
335 part_stat_add(cpu
, &mddev
->gendisk
->part0
, sectors
[rw
], sectors
);
338 if (atomic_dec_and_test(&mddev
->active_io
) && mddev
->suspended
)
339 wake_up(&mddev
->sb_wait
);
342 /* mddev_suspend makes sure no new requests are submitted
343 * to the device, and that any requests that have been submitted
344 * are completely handled.
345 * Once ->stop is called and completes, the module will be completely
348 void mddev_suspend(struct mddev
*mddev
)
350 BUG_ON(mddev
->suspended
);
351 mddev
->suspended
= 1;
353 wait_event(mddev
->sb_wait
, atomic_read(&mddev
->active_io
) == 0);
354 mddev
->pers
->quiesce(mddev
, 1);
356 del_timer_sync(&mddev
->safemode_timer
);
358 EXPORT_SYMBOL_GPL(mddev_suspend
);
360 void mddev_resume(struct mddev
*mddev
)
362 mddev
->suspended
= 0;
363 wake_up(&mddev
->sb_wait
);
364 mddev
->pers
->quiesce(mddev
, 0);
366 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
367 md_wakeup_thread(mddev
->thread
);
368 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
370 EXPORT_SYMBOL_GPL(mddev_resume
);
372 int mddev_congested(struct mddev
*mddev
, int bits
)
374 return mddev
->suspended
;
376 EXPORT_SYMBOL(mddev_congested
);
379 * Generic flush handling for md
382 static void md_end_flush(struct bio
*bio
, int err
)
384 struct md_rdev
*rdev
= bio
->bi_private
;
385 struct mddev
*mddev
= rdev
->mddev
;
387 rdev_dec_pending(rdev
, mddev
);
389 if (atomic_dec_and_test(&mddev
->flush_pending
)) {
390 /* The pre-request flush has finished */
391 queue_work(md_wq
, &mddev
->flush_work
);
396 static void md_submit_flush_data(struct work_struct
*ws
);
398 static void submit_flushes(struct work_struct
*ws
)
400 struct mddev
*mddev
= container_of(ws
, struct mddev
, flush_work
);
401 struct md_rdev
*rdev
;
403 INIT_WORK(&mddev
->flush_work
, md_submit_flush_data
);
404 atomic_set(&mddev
->flush_pending
, 1);
406 rdev_for_each_rcu(rdev
, mddev
)
407 if (rdev
->raid_disk
>= 0 &&
408 !test_bit(Faulty
, &rdev
->flags
)) {
409 /* Take two references, one is dropped
410 * when request finishes, one after
411 * we reclaim rcu_read_lock
414 atomic_inc(&rdev
->nr_pending
);
415 atomic_inc(&rdev
->nr_pending
);
417 bi
= bio_alloc_mddev(GFP_NOIO
, 0, mddev
);
418 bi
->bi_end_io
= md_end_flush
;
419 bi
->bi_private
= rdev
;
420 bi
->bi_bdev
= rdev
->bdev
;
421 atomic_inc(&mddev
->flush_pending
);
422 submit_bio(WRITE_FLUSH
, bi
);
424 rdev_dec_pending(rdev
, mddev
);
427 if (atomic_dec_and_test(&mddev
->flush_pending
))
428 queue_work(md_wq
, &mddev
->flush_work
);
431 static void md_submit_flush_data(struct work_struct
*ws
)
433 struct mddev
*mddev
= container_of(ws
, struct mddev
, flush_work
);
434 struct bio
*bio
= mddev
->flush_bio
;
436 if (bio
->bi_size
== 0)
437 /* an empty barrier - all done */
440 bio
->bi_rw
&= ~REQ_FLUSH
;
441 mddev
->pers
->make_request(mddev
, bio
);
444 mddev
->flush_bio
= NULL
;
445 wake_up(&mddev
->sb_wait
);
448 void md_flush_request(struct mddev
*mddev
, struct bio
*bio
)
450 spin_lock_irq(&mddev
->write_lock
);
451 wait_event_lock_irq(mddev
->sb_wait
,
454 mddev
->flush_bio
= bio
;
455 spin_unlock_irq(&mddev
->write_lock
);
457 INIT_WORK(&mddev
->flush_work
, submit_flushes
);
458 queue_work(md_wq
, &mddev
->flush_work
);
460 EXPORT_SYMBOL(md_flush_request
);
462 void md_unplug(struct blk_plug_cb
*cb
, bool from_schedule
)
464 struct mddev
*mddev
= cb
->data
;
465 md_wakeup_thread(mddev
->thread
);
468 EXPORT_SYMBOL(md_unplug
);
470 static inline struct mddev
*mddev_get(struct mddev
*mddev
)
472 atomic_inc(&mddev
->active
);
476 static void mddev_delayed_delete(struct work_struct
*ws
);
478 static void mddev_put(struct mddev
*mddev
)
480 struct bio_set
*bs
= NULL
;
482 if (!atomic_dec_and_lock(&mddev
->active
, &all_mddevs_lock
))
484 if (!mddev
->raid_disks
&& list_empty(&mddev
->disks
) &&
485 mddev
->ctime
== 0 && !mddev
->hold_active
) {
486 /* Array is not configured at all, and not held active,
488 list_del_init(&mddev
->all_mddevs
);
490 mddev
->bio_set
= NULL
;
491 if (mddev
->gendisk
) {
492 /* We did a probe so need to clean up. Call
493 * queue_work inside the spinlock so that
494 * flush_workqueue() after mddev_find will
495 * succeed in waiting for the work to be done.
497 INIT_WORK(&mddev
->del_work
, mddev_delayed_delete
);
498 queue_work(md_misc_wq
, &mddev
->del_work
);
502 spin_unlock(&all_mddevs_lock
);
507 void mddev_init(struct mddev
*mddev
)
509 mutex_init(&mddev
->open_mutex
);
510 mutex_init(&mddev
->reconfig_mutex
);
511 mutex_init(&mddev
->bitmap_info
.mutex
);
512 INIT_LIST_HEAD(&mddev
->disks
);
513 INIT_LIST_HEAD(&mddev
->all_mddevs
);
514 init_timer(&mddev
->safemode_timer
);
515 atomic_set(&mddev
->active
, 1);
516 atomic_set(&mddev
->openers
, 0);
517 atomic_set(&mddev
->active_io
, 0);
518 spin_lock_init(&mddev
->write_lock
);
519 atomic_set(&mddev
->flush_pending
, 0);
520 init_waitqueue_head(&mddev
->sb_wait
);
521 init_waitqueue_head(&mddev
->recovery_wait
);
522 mddev
->reshape_position
= MaxSector
;
523 mddev
->reshape_backwards
= 0;
524 mddev
->last_sync_action
= "none";
525 mddev
->resync_min
= 0;
526 mddev
->resync_max
= MaxSector
;
527 mddev
->level
= LEVEL_NONE
;
529 EXPORT_SYMBOL_GPL(mddev_init
);
531 static struct mddev
* mddev_find(dev_t unit
)
533 struct mddev
*mddev
, *new = NULL
;
535 if (unit
&& MAJOR(unit
) != MD_MAJOR
)
536 unit
&= ~((1<<MdpMinorShift
)-1);
539 spin_lock(&all_mddevs_lock
);
542 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
543 if (mddev
->unit
== unit
) {
545 spin_unlock(&all_mddevs_lock
);
551 list_add(&new->all_mddevs
, &all_mddevs
);
552 spin_unlock(&all_mddevs_lock
);
553 new->hold_active
= UNTIL_IOCTL
;
557 /* find an unused unit number */
558 static int next_minor
= 512;
559 int start
= next_minor
;
563 dev
= MKDEV(MD_MAJOR
, next_minor
);
565 if (next_minor
> MINORMASK
)
567 if (next_minor
== start
) {
568 /* Oh dear, all in use. */
569 spin_unlock(&all_mddevs_lock
);
575 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
576 if (mddev
->unit
== dev
) {
582 new->md_minor
= MINOR(dev
);
583 new->hold_active
= UNTIL_STOP
;
584 list_add(&new->all_mddevs
, &all_mddevs
);
585 spin_unlock(&all_mddevs_lock
);
588 spin_unlock(&all_mddevs_lock
);
590 new = kzalloc(sizeof(*new), GFP_KERNEL
);
595 if (MAJOR(unit
) == MD_MAJOR
)
596 new->md_minor
= MINOR(unit
);
598 new->md_minor
= MINOR(unit
) >> MdpMinorShift
;
605 static inline int __must_check
mddev_lock(struct mddev
* mddev
)
607 return mutex_lock_interruptible(&mddev
->reconfig_mutex
);
610 /* Sometimes we need to take the lock in a situation where
611 * failure due to interrupts is not acceptable.
613 static inline void mddev_lock_nointr(struct mddev
* mddev
)
615 mutex_lock(&mddev
->reconfig_mutex
);
618 static inline int mddev_is_locked(struct mddev
*mddev
)
620 return mutex_is_locked(&mddev
->reconfig_mutex
);
623 static inline int mddev_trylock(struct mddev
* mddev
)
625 return mutex_trylock(&mddev
->reconfig_mutex
);
628 static struct attribute_group md_redundancy_group
;
630 static void mddev_unlock(struct mddev
* mddev
)
632 if (mddev
->to_remove
) {
633 /* These cannot be removed under reconfig_mutex as
634 * an access to the files will try to take reconfig_mutex
635 * while holding the file unremovable, which leads to
637 * So hold set sysfs_active while the remove in happeing,
638 * and anything else which might set ->to_remove or my
639 * otherwise change the sysfs namespace will fail with
640 * -EBUSY if sysfs_active is still set.
641 * We set sysfs_active under reconfig_mutex and elsewhere
642 * test it under the same mutex to ensure its correct value
645 struct attribute_group
*to_remove
= mddev
->to_remove
;
646 mddev
->to_remove
= NULL
;
647 mddev
->sysfs_active
= 1;
648 mutex_unlock(&mddev
->reconfig_mutex
);
650 if (mddev
->kobj
.sd
) {
651 if (to_remove
!= &md_redundancy_group
)
652 sysfs_remove_group(&mddev
->kobj
, to_remove
);
653 if (mddev
->pers
== NULL
||
654 mddev
->pers
->sync_request
== NULL
) {
655 sysfs_remove_group(&mddev
->kobj
, &md_redundancy_group
);
656 if (mddev
->sysfs_action
)
657 sysfs_put(mddev
->sysfs_action
);
658 mddev
->sysfs_action
= NULL
;
661 mddev
->sysfs_active
= 0;
663 mutex_unlock(&mddev
->reconfig_mutex
);
665 /* As we've dropped the mutex we need a spinlock to
666 * make sure the thread doesn't disappear
668 spin_lock(&pers_lock
);
669 md_wakeup_thread(mddev
->thread
);
670 spin_unlock(&pers_lock
);
673 static struct md_rdev
* find_rdev_nr(struct mddev
*mddev
, int nr
)
675 struct md_rdev
*rdev
;
677 rdev_for_each(rdev
, mddev
)
678 if (rdev
->desc_nr
== nr
)
684 static struct md_rdev
*find_rdev_nr_rcu(struct mddev
*mddev
, int nr
)
686 struct md_rdev
*rdev
;
688 rdev_for_each_rcu(rdev
, mddev
)
689 if (rdev
->desc_nr
== nr
)
695 static struct md_rdev
*find_rdev(struct mddev
*mddev
, dev_t dev
)
697 struct md_rdev
*rdev
;
699 rdev_for_each(rdev
, mddev
)
700 if (rdev
->bdev
->bd_dev
== dev
)
706 static struct md_rdev
*find_rdev_rcu(struct mddev
*mddev
, dev_t dev
)
708 struct md_rdev
*rdev
;
710 rdev_for_each_rcu(rdev
, mddev
)
711 if (rdev
->bdev
->bd_dev
== dev
)
717 static struct md_personality
*find_pers(int level
, char *clevel
)
719 struct md_personality
*pers
;
720 list_for_each_entry(pers
, &pers_list
, list
) {
721 if (level
!= LEVEL_NONE
&& pers
->level
== level
)
723 if (strcmp(pers
->name
, clevel
)==0)
729 /* return the offset of the super block in 512byte sectors */
730 static inline sector_t
calc_dev_sboffset(struct md_rdev
*rdev
)
732 sector_t num_sectors
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
733 return MD_NEW_SIZE_SECTORS(num_sectors
);
736 static int alloc_disk_sb(struct md_rdev
* rdev
)
741 rdev
->sb_page
= alloc_page(GFP_KERNEL
);
742 if (!rdev
->sb_page
) {
743 printk(KERN_ALERT
"md: out of memory.\n");
750 void md_rdev_clear(struct md_rdev
*rdev
)
753 put_page(rdev
->sb_page
);
755 rdev
->sb_page
= NULL
;
760 put_page(rdev
->bb_page
);
761 rdev
->bb_page
= NULL
;
763 kfree(rdev
->badblocks
.page
);
764 rdev
->badblocks
.page
= NULL
;
766 EXPORT_SYMBOL_GPL(md_rdev_clear
);
768 static void super_written(struct bio
*bio
, int error
)
770 struct md_rdev
*rdev
= bio
->bi_private
;
771 struct mddev
*mddev
= rdev
->mddev
;
773 if (error
|| !test_bit(BIO_UPTODATE
, &bio
->bi_flags
)) {
774 printk("md: super_written gets error=%d, uptodate=%d\n",
775 error
, test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
776 WARN_ON(test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
777 md_error(mddev
, rdev
);
780 if (atomic_dec_and_test(&mddev
->pending_writes
))
781 wake_up(&mddev
->sb_wait
);
785 void md_super_write(struct mddev
*mddev
, struct md_rdev
*rdev
,
786 sector_t sector
, int size
, struct page
*page
)
788 /* write first size bytes of page to sector of rdev
789 * Increment mddev->pending_writes before returning
790 * and decrement it on completion, waking up sb_wait
791 * if zero is reached.
792 * If an error occurred, call md_error
794 struct bio
*bio
= bio_alloc_mddev(GFP_NOIO
, 1, mddev
);
796 bio
->bi_bdev
= rdev
->meta_bdev
? rdev
->meta_bdev
: rdev
->bdev
;
797 bio
->bi_sector
= sector
;
798 bio_add_page(bio
, page
, size
, 0);
799 bio
->bi_private
= rdev
;
800 bio
->bi_end_io
= super_written
;
802 atomic_inc(&mddev
->pending_writes
);
803 submit_bio(WRITE_FLUSH_FUA
, bio
);
806 void md_super_wait(struct mddev
*mddev
)
808 /* wait for all superblock writes that were scheduled to complete */
811 prepare_to_wait(&mddev
->sb_wait
, &wq
, TASK_UNINTERRUPTIBLE
);
812 if (atomic_read(&mddev
->pending_writes
)==0)
816 finish_wait(&mddev
->sb_wait
, &wq
);
819 static void bi_complete(struct bio
*bio
, int error
)
821 complete((struct completion
*)bio
->bi_private
);
824 int sync_page_io(struct md_rdev
*rdev
, sector_t sector
, int size
,
825 struct page
*page
, int rw
, bool metadata_op
)
827 struct bio
*bio
= bio_alloc_mddev(GFP_NOIO
, 1, rdev
->mddev
);
828 struct completion event
;
833 bio
->bi_bdev
= (metadata_op
&& rdev
->meta_bdev
) ?
834 rdev
->meta_bdev
: rdev
->bdev
;
836 bio
->bi_sector
= sector
+ rdev
->sb_start
;
837 else if (rdev
->mddev
->reshape_position
!= MaxSector
&&
838 (rdev
->mddev
->reshape_backwards
==
839 (sector
>= rdev
->mddev
->reshape_position
)))
840 bio
->bi_sector
= sector
+ rdev
->new_data_offset
;
842 bio
->bi_sector
= sector
+ rdev
->data_offset
;
843 bio_add_page(bio
, page
, size
, 0);
844 init_completion(&event
);
845 bio
->bi_private
= &event
;
846 bio
->bi_end_io
= bi_complete
;
848 wait_for_completion(&event
);
850 ret
= test_bit(BIO_UPTODATE
, &bio
->bi_flags
);
854 EXPORT_SYMBOL_GPL(sync_page_io
);
856 static int read_disk_sb(struct md_rdev
* rdev
, int size
)
858 char b
[BDEVNAME_SIZE
];
859 if (!rdev
->sb_page
) {
867 if (!sync_page_io(rdev
, 0, size
, rdev
->sb_page
, READ
, true))
873 printk(KERN_WARNING
"md: disabled device %s, could not read superblock.\n",
874 bdevname(rdev
->bdev
,b
));
878 static int uuid_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
880 return sb1
->set_uuid0
== sb2
->set_uuid0
&&
881 sb1
->set_uuid1
== sb2
->set_uuid1
&&
882 sb1
->set_uuid2
== sb2
->set_uuid2
&&
883 sb1
->set_uuid3
== sb2
->set_uuid3
;
886 static int sb_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
889 mdp_super_t
*tmp1
, *tmp2
;
891 tmp1
= kmalloc(sizeof(*tmp1
),GFP_KERNEL
);
892 tmp2
= kmalloc(sizeof(*tmp2
),GFP_KERNEL
);
894 if (!tmp1
|| !tmp2
) {
896 printk(KERN_INFO
"md.c sb_equal(): failed to allocate memory!\n");
904 * nr_disks is not constant
909 ret
= (memcmp(tmp1
, tmp2
, MD_SB_GENERIC_CONSTANT_WORDS
* 4) == 0);
917 static u32
md_csum_fold(u32 csum
)
919 csum
= (csum
& 0xffff) + (csum
>> 16);
920 return (csum
& 0xffff) + (csum
>> 16);
923 static unsigned int calc_sb_csum(mdp_super_t
* sb
)
926 u32
*sb32
= (u32
*)sb
;
928 unsigned int disk_csum
, csum
;
930 disk_csum
= sb
->sb_csum
;
933 for (i
= 0; i
< MD_SB_BYTES
/4 ; i
++)
935 csum
= (newcsum
& 0xffffffff) + (newcsum
>>32);
939 /* This used to use csum_partial, which was wrong for several
940 * reasons including that different results are returned on
941 * different architectures. It isn't critical that we get exactly
942 * the same return value as before (we always csum_fold before
943 * testing, and that removes any differences). However as we
944 * know that csum_partial always returned a 16bit value on
945 * alphas, do a fold to maximise conformity to previous behaviour.
947 sb
->sb_csum
= md_csum_fold(disk_csum
);
949 sb
->sb_csum
= disk_csum
;
956 * Handle superblock details.
957 * We want to be able to handle multiple superblock formats
958 * so we have a common interface to them all, and an array of
959 * different handlers.
960 * We rely on user-space to write the initial superblock, and support
961 * reading and updating of superblocks.
962 * Interface methods are:
963 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version)
964 * loads and validates a superblock on dev.
965 * if refdev != NULL, compare superblocks on both devices
967 * 0 - dev has a superblock that is compatible with refdev
968 * 1 - dev has a superblock that is compatible and newer than refdev
969 * so dev should be used as the refdev in future
970 * -EINVAL superblock incompatible or invalid
971 * -othererror e.g. -EIO
973 * int validate_super(struct mddev *mddev, struct md_rdev *dev)
974 * Verify that dev is acceptable into mddev.
975 * The first time, mddev->raid_disks will be 0, and data from
976 * dev should be merged in. Subsequent calls check that dev
977 * is new enough. Return 0 or -EINVAL
979 * void sync_super(struct mddev *mddev, struct md_rdev *dev)
980 * Update the superblock for rdev with data in mddev
981 * This does not write to disc.
987 struct module
*owner
;
988 int (*load_super
)(struct md_rdev
*rdev
,
989 struct md_rdev
*refdev
,
991 int (*validate_super
)(struct mddev
*mddev
,
992 struct md_rdev
*rdev
);
993 void (*sync_super
)(struct mddev
*mddev
,
994 struct md_rdev
*rdev
);
995 unsigned long long (*rdev_size_change
)(struct md_rdev
*rdev
,
996 sector_t num_sectors
);
997 int (*allow_new_offset
)(struct md_rdev
*rdev
,
998 unsigned long long new_offset
);
1002 * Check that the given mddev has no bitmap.
1004 * This function is called from the run method of all personalities that do not
1005 * support bitmaps. It prints an error message and returns non-zero if mddev
1006 * has a bitmap. Otherwise, it returns 0.
1009 int md_check_no_bitmap(struct mddev
*mddev
)
1011 if (!mddev
->bitmap_info
.file
&& !mddev
->bitmap_info
.offset
)
1013 printk(KERN_ERR
"%s: bitmaps are not supported for %s\n",
1014 mdname(mddev
), mddev
->pers
->name
);
1017 EXPORT_SYMBOL(md_check_no_bitmap
);
1020 * load_super for 0.90.0
1022 static int super_90_load(struct md_rdev
*rdev
, struct md_rdev
*refdev
, int minor_version
)
1024 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1029 * Calculate the position of the superblock (512byte sectors),
1030 * it's at the end of the disk.
1032 * It also happens to be a multiple of 4Kb.
1034 rdev
->sb_start
= calc_dev_sboffset(rdev
);
1036 ret
= read_disk_sb(rdev
, MD_SB_BYTES
);
1037 if (ret
) return ret
;
1041 bdevname(rdev
->bdev
, b
);
1042 sb
= page_address(rdev
->sb_page
);
1044 if (sb
->md_magic
!= MD_SB_MAGIC
) {
1045 printk(KERN_ERR
"md: invalid raid superblock magic on %s\n",
1050 if (sb
->major_version
!= 0 ||
1051 sb
->minor_version
< 90 ||
1052 sb
->minor_version
> 91) {
1053 printk(KERN_WARNING
"Bad version number %d.%d on %s\n",
1054 sb
->major_version
, sb
->minor_version
,
1059 if (sb
->raid_disks
<= 0)
1062 if (md_csum_fold(calc_sb_csum(sb
)) != md_csum_fold(sb
->sb_csum
)) {
1063 printk(KERN_WARNING
"md: invalid superblock checksum on %s\n",
1068 rdev
->preferred_minor
= sb
->md_minor
;
1069 rdev
->data_offset
= 0;
1070 rdev
->new_data_offset
= 0;
1071 rdev
->sb_size
= MD_SB_BYTES
;
1072 rdev
->badblocks
.shift
= -1;
1074 if (sb
->level
== LEVEL_MULTIPATH
)
1077 rdev
->desc_nr
= sb
->this_disk
.number
;
1083 mdp_super_t
*refsb
= page_address(refdev
->sb_page
);
1084 if (!uuid_equal(refsb
, sb
)) {
1085 printk(KERN_WARNING
"md: %s has different UUID to %s\n",
1086 b
, bdevname(refdev
->bdev
,b2
));
1089 if (!sb_equal(refsb
, sb
)) {
1090 printk(KERN_WARNING
"md: %s has same UUID"
1091 " but different superblock to %s\n",
1092 b
, bdevname(refdev
->bdev
, b2
));
1096 ev2
= md_event(refsb
);
1102 rdev
->sectors
= rdev
->sb_start
;
1103 /* Limit to 4TB as metadata cannot record more than that.
1104 * (not needed for Linear and RAID0 as metadata doesn't
1107 if (rdev
->sectors
>= (2ULL << 32) && sb
->level
>= 1)
1108 rdev
->sectors
= (2ULL << 32) - 2;
1110 if (rdev
->sectors
< ((sector_t
)sb
->size
) * 2 && sb
->level
>= 1)
1111 /* "this cannot possibly happen" ... */
1119 * validate_super for 0.90.0
1121 static int super_90_validate(struct mddev
*mddev
, struct md_rdev
*rdev
)
1124 mdp_super_t
*sb
= page_address(rdev
->sb_page
);
1125 __u64 ev1
= md_event(sb
);
1127 rdev
->raid_disk
= -1;
1128 clear_bit(Faulty
, &rdev
->flags
);
1129 clear_bit(In_sync
, &rdev
->flags
);
1130 clear_bit(WriteMostly
, &rdev
->flags
);
1132 if (mddev
->raid_disks
== 0) {
1133 mddev
->major_version
= 0;
1134 mddev
->minor_version
= sb
->minor_version
;
1135 mddev
->patch_version
= sb
->patch_version
;
1136 mddev
->external
= 0;
1137 mddev
->chunk_sectors
= sb
->chunk_size
>> 9;
1138 mddev
->ctime
= sb
->ctime
;
1139 mddev
->utime
= sb
->utime
;
1140 mddev
->level
= sb
->level
;
1141 mddev
->clevel
[0] = 0;
1142 mddev
->layout
= sb
->layout
;
1143 mddev
->raid_disks
= sb
->raid_disks
;
1144 mddev
->dev_sectors
= ((sector_t
)sb
->size
) * 2;
1145 mddev
->events
= ev1
;
1146 mddev
->bitmap_info
.offset
= 0;
1147 mddev
->bitmap_info
.space
= 0;
1148 /* bitmap can use 60 K after the 4K superblocks */
1149 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
1150 mddev
->bitmap_info
.default_space
= 64*2 - (MD_SB_BYTES
>> 9);
1151 mddev
->reshape_backwards
= 0;
1153 if (mddev
->minor_version
>= 91) {
1154 mddev
->reshape_position
= sb
->reshape_position
;
1155 mddev
->delta_disks
= sb
->delta_disks
;
1156 mddev
->new_level
= sb
->new_level
;
1157 mddev
->new_layout
= sb
->new_layout
;
1158 mddev
->new_chunk_sectors
= sb
->new_chunk
>> 9;
1159 if (mddev
->delta_disks
< 0)
1160 mddev
->reshape_backwards
= 1;
1162 mddev
->reshape_position
= MaxSector
;
1163 mddev
->delta_disks
= 0;
1164 mddev
->new_level
= mddev
->level
;
1165 mddev
->new_layout
= mddev
->layout
;
1166 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1169 if (sb
->state
& (1<<MD_SB_CLEAN
))
1170 mddev
->recovery_cp
= MaxSector
;
1172 if (sb
->events_hi
== sb
->cp_events_hi
&&
1173 sb
->events_lo
== sb
->cp_events_lo
) {
1174 mddev
->recovery_cp
= sb
->recovery_cp
;
1176 mddev
->recovery_cp
= 0;
1179 memcpy(mddev
->uuid
+0, &sb
->set_uuid0
, 4);
1180 memcpy(mddev
->uuid
+4, &sb
->set_uuid1
, 4);
1181 memcpy(mddev
->uuid
+8, &sb
->set_uuid2
, 4);
1182 memcpy(mddev
->uuid
+12,&sb
->set_uuid3
, 4);
1184 mddev
->max_disks
= MD_SB_DISKS
;
1186 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
) &&
1187 mddev
->bitmap_info
.file
== NULL
) {
1188 mddev
->bitmap_info
.offset
=
1189 mddev
->bitmap_info
.default_offset
;
1190 mddev
->bitmap_info
.space
=
1191 mddev
->bitmap_info
.default_space
;
1194 } else if (mddev
->pers
== NULL
) {
1195 /* Insist on good event counter while assembling, except
1196 * for spares (which don't need an event count) */
1198 if (sb
->disks
[rdev
->desc_nr
].state
& (
1199 (1<<MD_DISK_SYNC
) | (1 << MD_DISK_ACTIVE
)))
1200 if (ev1
< mddev
->events
)
1202 } else if (mddev
->bitmap
) {
1203 /* if adding to array with a bitmap, then we can accept an
1204 * older device ... but not too old.
1206 if (ev1
< mddev
->bitmap
->events_cleared
)
1209 if (ev1
< mddev
->events
)
1210 /* just a hot-add of a new device, leave raid_disk at -1 */
1214 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1215 desc
= sb
->disks
+ rdev
->desc_nr
;
1217 if (desc
->state
& (1<<MD_DISK_FAULTY
))
1218 set_bit(Faulty
, &rdev
->flags
);
1219 else if (desc
->state
& (1<<MD_DISK_SYNC
) /* &&
1220 desc->raid_disk < mddev->raid_disks */) {
1221 set_bit(In_sync
, &rdev
->flags
);
1222 rdev
->raid_disk
= desc
->raid_disk
;
1223 } else if (desc
->state
& (1<<MD_DISK_ACTIVE
)) {
1224 /* active but not in sync implies recovery up to
1225 * reshape position. We don't know exactly where
1226 * that is, so set to zero for now */
1227 if (mddev
->minor_version
>= 91) {
1228 rdev
->recovery_offset
= 0;
1229 rdev
->raid_disk
= desc
->raid_disk
;
1232 if (desc
->state
& (1<<MD_DISK_WRITEMOSTLY
))
1233 set_bit(WriteMostly
, &rdev
->flags
);
1234 } else /* MULTIPATH are always insync */
1235 set_bit(In_sync
, &rdev
->flags
);
1240 * sync_super for 0.90.0
1242 static void super_90_sync(struct mddev
*mddev
, struct md_rdev
*rdev
)
1245 struct md_rdev
*rdev2
;
1246 int next_spare
= mddev
->raid_disks
;
1249 /* make rdev->sb match mddev data..
1252 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1253 * 3/ any empty disks < next_spare become removed
1255 * disks[0] gets initialised to REMOVED because
1256 * we cannot be sure from other fields if it has
1257 * been initialised or not.
1260 int active
=0, working
=0,failed
=0,spare
=0,nr_disks
=0;
1262 rdev
->sb_size
= MD_SB_BYTES
;
1264 sb
= page_address(rdev
->sb_page
);
1266 memset(sb
, 0, sizeof(*sb
));
1268 sb
->md_magic
= MD_SB_MAGIC
;
1269 sb
->major_version
= mddev
->major_version
;
1270 sb
->patch_version
= mddev
->patch_version
;
1271 sb
->gvalid_words
= 0; /* ignored */
1272 memcpy(&sb
->set_uuid0
, mddev
->uuid
+0, 4);
1273 memcpy(&sb
->set_uuid1
, mddev
->uuid
+4, 4);
1274 memcpy(&sb
->set_uuid2
, mddev
->uuid
+8, 4);
1275 memcpy(&sb
->set_uuid3
, mddev
->uuid
+12,4);
1277 sb
->ctime
= mddev
->ctime
;
1278 sb
->level
= mddev
->level
;
1279 sb
->size
= mddev
->dev_sectors
/ 2;
1280 sb
->raid_disks
= mddev
->raid_disks
;
1281 sb
->md_minor
= mddev
->md_minor
;
1282 sb
->not_persistent
= 0;
1283 sb
->utime
= mddev
->utime
;
1285 sb
->events_hi
= (mddev
->events
>>32);
1286 sb
->events_lo
= (u32
)mddev
->events
;
1288 if (mddev
->reshape_position
== MaxSector
)
1289 sb
->minor_version
= 90;
1291 sb
->minor_version
= 91;
1292 sb
->reshape_position
= mddev
->reshape_position
;
1293 sb
->new_level
= mddev
->new_level
;
1294 sb
->delta_disks
= mddev
->delta_disks
;
1295 sb
->new_layout
= mddev
->new_layout
;
1296 sb
->new_chunk
= mddev
->new_chunk_sectors
<< 9;
1298 mddev
->minor_version
= sb
->minor_version
;
1301 sb
->recovery_cp
= mddev
->recovery_cp
;
1302 sb
->cp_events_hi
= (mddev
->events
>>32);
1303 sb
->cp_events_lo
= (u32
)mddev
->events
;
1304 if (mddev
->recovery_cp
== MaxSector
)
1305 sb
->state
= (1<< MD_SB_CLEAN
);
1307 sb
->recovery_cp
= 0;
1309 sb
->layout
= mddev
->layout
;
1310 sb
->chunk_size
= mddev
->chunk_sectors
<< 9;
1312 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
)
1313 sb
->state
|= (1<<MD_SB_BITMAP_PRESENT
);
1315 sb
->disks
[0].state
= (1<<MD_DISK_REMOVED
);
1316 rdev_for_each(rdev2
, mddev
) {
1319 int is_active
= test_bit(In_sync
, &rdev2
->flags
);
1321 if (rdev2
->raid_disk
>= 0 &&
1322 sb
->minor_version
>= 91)
1323 /* we have nowhere to store the recovery_offset,
1324 * but if it is not below the reshape_position,
1325 * we can piggy-back on that.
1328 if (rdev2
->raid_disk
< 0 ||
1329 test_bit(Faulty
, &rdev2
->flags
))
1332 desc_nr
= rdev2
->raid_disk
;
1334 desc_nr
= next_spare
++;
1335 rdev2
->desc_nr
= desc_nr
;
1336 d
= &sb
->disks
[rdev2
->desc_nr
];
1338 d
->number
= rdev2
->desc_nr
;
1339 d
->major
= MAJOR(rdev2
->bdev
->bd_dev
);
1340 d
->minor
= MINOR(rdev2
->bdev
->bd_dev
);
1342 d
->raid_disk
= rdev2
->raid_disk
;
1344 d
->raid_disk
= rdev2
->desc_nr
; /* compatibility */
1345 if (test_bit(Faulty
, &rdev2
->flags
))
1346 d
->state
= (1<<MD_DISK_FAULTY
);
1347 else if (is_active
) {
1348 d
->state
= (1<<MD_DISK_ACTIVE
);
1349 if (test_bit(In_sync
, &rdev2
->flags
))
1350 d
->state
|= (1<<MD_DISK_SYNC
);
1358 if (test_bit(WriteMostly
, &rdev2
->flags
))
1359 d
->state
|= (1<<MD_DISK_WRITEMOSTLY
);
1361 /* now set the "removed" and "faulty" bits on any missing devices */
1362 for (i
=0 ; i
< mddev
->raid_disks
; i
++) {
1363 mdp_disk_t
*d
= &sb
->disks
[i
];
1364 if (d
->state
== 0 && d
->number
== 0) {
1367 d
->state
= (1<<MD_DISK_REMOVED
);
1368 d
->state
|= (1<<MD_DISK_FAULTY
);
1372 sb
->nr_disks
= nr_disks
;
1373 sb
->active_disks
= active
;
1374 sb
->working_disks
= working
;
1375 sb
->failed_disks
= failed
;
1376 sb
->spare_disks
= spare
;
1378 sb
->this_disk
= sb
->disks
[rdev
->desc_nr
];
1379 sb
->sb_csum
= calc_sb_csum(sb
);
1383 * rdev_size_change for 0.90.0
1385 static unsigned long long
1386 super_90_rdev_size_change(struct md_rdev
*rdev
, sector_t num_sectors
)
1388 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1389 return 0; /* component must fit device */
1390 if (rdev
->mddev
->bitmap_info
.offset
)
1391 return 0; /* can't move bitmap */
1392 rdev
->sb_start
= calc_dev_sboffset(rdev
);
1393 if (!num_sectors
|| num_sectors
> rdev
->sb_start
)
1394 num_sectors
= rdev
->sb_start
;
1395 /* Limit to 4TB as metadata cannot record more than that.
1396 * 4TB == 2^32 KB, or 2*2^32 sectors.
1398 if (num_sectors
>= (2ULL << 32) && rdev
->mddev
->level
>= 1)
1399 num_sectors
= (2ULL << 32) - 2;
1400 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1402 md_super_wait(rdev
->mddev
);
1407 super_90_allow_new_offset(struct md_rdev
*rdev
, unsigned long long new_offset
)
1409 /* non-zero offset changes not possible with v0.90 */
1410 return new_offset
== 0;
1414 * version 1 superblock
1417 static __le32
calc_sb_1_csum(struct mdp_superblock_1
* sb
)
1421 unsigned long long newcsum
;
1422 int size
= 256 + le32_to_cpu(sb
->max_dev
)*2;
1423 __le32
*isuper
= (__le32
*)sb
;
1425 disk_csum
= sb
->sb_csum
;
1428 for (; size
>= 4; size
-= 4)
1429 newcsum
+= le32_to_cpu(*isuper
++);
1432 newcsum
+= le16_to_cpu(*(__le16
*) isuper
);
1434 csum
= (newcsum
& 0xffffffff) + (newcsum
>> 32);
1435 sb
->sb_csum
= disk_csum
;
1436 return cpu_to_le32(csum
);
1439 static int md_set_badblocks(struct badblocks
*bb
, sector_t s
, int sectors
,
1441 static int super_1_load(struct md_rdev
*rdev
, struct md_rdev
*refdev
, int minor_version
)
1443 struct mdp_superblock_1
*sb
;
1447 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1451 * Calculate the position of the superblock in 512byte sectors.
1452 * It is always aligned to a 4K boundary and
1453 * depeding on minor_version, it can be:
1454 * 0: At least 8K, but less than 12K, from end of device
1455 * 1: At start of device
1456 * 2: 4K from start of device.
1458 switch(minor_version
) {
1460 sb_start
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1462 sb_start
&= ~(sector_t
)(4*2-1);
1473 rdev
->sb_start
= sb_start
;
1475 /* superblock is rarely larger than 1K, but it can be larger,
1476 * and it is safe to read 4k, so we do that
1478 ret
= read_disk_sb(rdev
, 4096);
1479 if (ret
) return ret
;
1482 sb
= page_address(rdev
->sb_page
);
1484 if (sb
->magic
!= cpu_to_le32(MD_SB_MAGIC
) ||
1485 sb
->major_version
!= cpu_to_le32(1) ||
1486 le32_to_cpu(sb
->max_dev
) > (4096-256)/2 ||
1487 le64_to_cpu(sb
->super_offset
) != rdev
->sb_start
||
1488 (le32_to_cpu(sb
->feature_map
) & ~MD_FEATURE_ALL
) != 0)
1491 if (calc_sb_1_csum(sb
) != sb
->sb_csum
) {
1492 printk("md: invalid superblock checksum on %s\n",
1493 bdevname(rdev
->bdev
,b
));
1496 if (le64_to_cpu(sb
->data_size
) < 10) {
1497 printk("md: data_size too small on %s\n",
1498 bdevname(rdev
->bdev
,b
));
1503 memcmp(sb
->pad3
, sb
->pad3
+1, sizeof(sb
->pad3
) - sizeof(sb
->pad3
[1])))
1504 /* Some padding is non-zero, might be a new feature */
1507 rdev
->preferred_minor
= 0xffff;
1508 rdev
->data_offset
= le64_to_cpu(sb
->data_offset
);
1509 rdev
->new_data_offset
= rdev
->data_offset
;
1510 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
) &&
1511 (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_NEW_OFFSET
))
1512 rdev
->new_data_offset
+= (s32
)le32_to_cpu(sb
->new_offset
);
1513 atomic_set(&rdev
->corrected_errors
, le32_to_cpu(sb
->cnt_corrected_read
));
1515 rdev
->sb_size
= le32_to_cpu(sb
->max_dev
) * 2 + 256;
1516 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1517 if (rdev
->sb_size
& bmask
)
1518 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1521 && rdev
->data_offset
< sb_start
+ (rdev
->sb_size
/512))
1524 && rdev
->new_data_offset
< sb_start
+ (rdev
->sb_size
/512))
1527 if (sb
->level
== cpu_to_le32(LEVEL_MULTIPATH
))
1530 rdev
->desc_nr
= le32_to_cpu(sb
->dev_number
);
1532 if (!rdev
->bb_page
) {
1533 rdev
->bb_page
= alloc_page(GFP_KERNEL
);
1537 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BAD_BLOCKS
) &&
1538 rdev
->badblocks
.count
== 0) {
1539 /* need to load the bad block list.
1540 * Currently we limit it to one page.
1546 int sectors
= le16_to_cpu(sb
->bblog_size
);
1547 if (sectors
> (PAGE_SIZE
/ 512))
1549 offset
= le32_to_cpu(sb
->bblog_offset
);
1552 bb_sector
= (long long)offset
;
1553 if (!sync_page_io(rdev
, bb_sector
, sectors
<< 9,
1554 rdev
->bb_page
, READ
, true))
1556 bbp
= (u64
*)page_address(rdev
->bb_page
);
1557 rdev
->badblocks
.shift
= sb
->bblog_shift
;
1558 for (i
= 0 ; i
< (sectors
<< (9-3)) ; i
++, bbp
++) {
1559 u64 bb
= le64_to_cpu(*bbp
);
1560 int count
= bb
& (0x3ff);
1561 u64 sector
= bb
>> 10;
1562 sector
<<= sb
->bblog_shift
;
1563 count
<<= sb
->bblog_shift
;
1566 if (md_set_badblocks(&rdev
->badblocks
,
1567 sector
, count
, 1) == 0)
1570 } else if (sb
->bblog_offset
!= 0)
1571 rdev
->badblocks
.shift
= 0;
1577 struct mdp_superblock_1
*refsb
= page_address(refdev
->sb_page
);
1579 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16) != 0 ||
1580 sb
->level
!= refsb
->level
||
1581 sb
->layout
!= refsb
->layout
||
1582 sb
->chunksize
!= refsb
->chunksize
) {
1583 printk(KERN_WARNING
"md: %s has strangely different"
1584 " superblock to %s\n",
1585 bdevname(rdev
->bdev
,b
),
1586 bdevname(refdev
->bdev
,b2
));
1589 ev1
= le64_to_cpu(sb
->events
);
1590 ev2
= le64_to_cpu(refsb
->events
);
1597 if (minor_version
) {
1598 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9);
1599 sectors
-= rdev
->data_offset
;
1601 sectors
= rdev
->sb_start
;
1602 if (sectors
< le64_to_cpu(sb
->data_size
))
1604 rdev
->sectors
= le64_to_cpu(sb
->data_size
);
1608 static int super_1_validate(struct mddev
*mddev
, struct md_rdev
*rdev
)
1610 struct mdp_superblock_1
*sb
= page_address(rdev
->sb_page
);
1611 __u64 ev1
= le64_to_cpu(sb
->events
);
1613 rdev
->raid_disk
= -1;
1614 clear_bit(Faulty
, &rdev
->flags
);
1615 clear_bit(In_sync
, &rdev
->flags
);
1616 clear_bit(WriteMostly
, &rdev
->flags
);
1618 if (mddev
->raid_disks
== 0) {
1619 mddev
->major_version
= 1;
1620 mddev
->patch_version
= 0;
1621 mddev
->external
= 0;
1622 mddev
->chunk_sectors
= le32_to_cpu(sb
->chunksize
);
1623 mddev
->ctime
= le64_to_cpu(sb
->ctime
) & ((1ULL << 32)-1);
1624 mddev
->utime
= le64_to_cpu(sb
->utime
) & ((1ULL << 32)-1);
1625 mddev
->level
= le32_to_cpu(sb
->level
);
1626 mddev
->clevel
[0] = 0;
1627 mddev
->layout
= le32_to_cpu(sb
->layout
);
1628 mddev
->raid_disks
= le32_to_cpu(sb
->raid_disks
);
1629 mddev
->dev_sectors
= le64_to_cpu(sb
->size
);
1630 mddev
->events
= ev1
;
1631 mddev
->bitmap_info
.offset
= 0;
1632 mddev
->bitmap_info
.space
= 0;
1633 /* Default location for bitmap is 1K after superblock
1634 * using 3K - total of 4K
1636 mddev
->bitmap_info
.default_offset
= 1024 >> 9;
1637 mddev
->bitmap_info
.default_space
= (4096-1024) >> 9;
1638 mddev
->reshape_backwards
= 0;
1640 mddev
->recovery_cp
= le64_to_cpu(sb
->resync_offset
);
1641 memcpy(mddev
->uuid
, sb
->set_uuid
, 16);
1643 mddev
->max_disks
= (4096-256)/2;
1645 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
) &&
1646 mddev
->bitmap_info
.file
== NULL
) {
1647 mddev
->bitmap_info
.offset
=
1648 (__s32
)le32_to_cpu(sb
->bitmap_offset
);
1649 /* Metadata doesn't record how much space is available.
1650 * For 1.0, we assume we can use up to the superblock
1651 * if before, else to 4K beyond superblock.
1652 * For others, assume no change is possible.
1654 if (mddev
->minor_version
> 0)
1655 mddev
->bitmap_info
.space
= 0;
1656 else if (mddev
->bitmap_info
.offset
> 0)
1657 mddev
->bitmap_info
.space
=
1658 8 - mddev
->bitmap_info
.offset
;
1660 mddev
->bitmap_info
.space
=
1661 -mddev
->bitmap_info
.offset
;
1664 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
1665 mddev
->reshape_position
= le64_to_cpu(sb
->reshape_position
);
1666 mddev
->delta_disks
= le32_to_cpu(sb
->delta_disks
);
1667 mddev
->new_level
= le32_to_cpu(sb
->new_level
);
1668 mddev
->new_layout
= le32_to_cpu(sb
->new_layout
);
1669 mddev
->new_chunk_sectors
= le32_to_cpu(sb
->new_chunk
);
1670 if (mddev
->delta_disks
< 0 ||
1671 (mddev
->delta_disks
== 0 &&
1672 (le32_to_cpu(sb
->feature_map
)
1673 & MD_FEATURE_RESHAPE_BACKWARDS
)))
1674 mddev
->reshape_backwards
= 1;
1676 mddev
->reshape_position
= MaxSector
;
1677 mddev
->delta_disks
= 0;
1678 mddev
->new_level
= mddev
->level
;
1679 mddev
->new_layout
= mddev
->layout
;
1680 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1683 } else if (mddev
->pers
== NULL
) {
1684 /* Insist of good event counter while assembling, except for
1685 * spares (which don't need an event count) */
1687 if (rdev
->desc_nr
>= 0 &&
1688 rdev
->desc_nr
< le32_to_cpu(sb
->max_dev
) &&
1689 le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]) < 0xfffe)
1690 if (ev1
< mddev
->events
)
1692 } else if (mddev
->bitmap
) {
1693 /* If adding to array with a bitmap, then we can accept an
1694 * older device, but not too old.
1696 if (ev1
< mddev
->bitmap
->events_cleared
)
1699 if (ev1
< mddev
->events
)
1700 /* just a hot-add of a new device, leave raid_disk at -1 */
1703 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1705 if (rdev
->desc_nr
< 0 ||
1706 rdev
->desc_nr
>= le32_to_cpu(sb
->max_dev
)) {
1710 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
1712 case 0xffff: /* spare */
1714 case 0xfffe: /* faulty */
1715 set_bit(Faulty
, &rdev
->flags
);
1718 if ((le32_to_cpu(sb
->feature_map
) &
1719 MD_FEATURE_RECOVERY_OFFSET
))
1720 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
1722 set_bit(In_sync
, &rdev
->flags
);
1723 rdev
->raid_disk
= role
;
1726 if (sb
->devflags
& WriteMostly1
)
1727 set_bit(WriteMostly
, &rdev
->flags
);
1728 if (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_REPLACEMENT
)
1729 set_bit(Replacement
, &rdev
->flags
);
1730 } else /* MULTIPATH are always insync */
1731 set_bit(In_sync
, &rdev
->flags
);
1736 static void super_1_sync(struct mddev
*mddev
, struct md_rdev
*rdev
)
1738 struct mdp_superblock_1
*sb
;
1739 struct md_rdev
*rdev2
;
1741 /* make rdev->sb match mddev and rdev data. */
1743 sb
= page_address(rdev
->sb_page
);
1745 sb
->feature_map
= 0;
1747 sb
->recovery_offset
= cpu_to_le64(0);
1748 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
1750 sb
->utime
= cpu_to_le64((__u64
)mddev
->utime
);
1751 sb
->events
= cpu_to_le64(mddev
->events
);
1753 sb
->resync_offset
= cpu_to_le64(mddev
->recovery_cp
);
1755 sb
->resync_offset
= cpu_to_le64(0);
1757 sb
->cnt_corrected_read
= cpu_to_le32(atomic_read(&rdev
->corrected_errors
));
1759 sb
->raid_disks
= cpu_to_le32(mddev
->raid_disks
);
1760 sb
->size
= cpu_to_le64(mddev
->dev_sectors
);
1761 sb
->chunksize
= cpu_to_le32(mddev
->chunk_sectors
);
1762 sb
->level
= cpu_to_le32(mddev
->level
);
1763 sb
->layout
= cpu_to_le32(mddev
->layout
);
1765 if (test_bit(WriteMostly
, &rdev
->flags
))
1766 sb
->devflags
|= WriteMostly1
;
1768 sb
->devflags
&= ~WriteMostly1
;
1769 sb
->data_offset
= cpu_to_le64(rdev
->data_offset
);
1770 sb
->data_size
= cpu_to_le64(rdev
->sectors
);
1772 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
) {
1773 sb
->bitmap_offset
= cpu_to_le32((__u32
)mddev
->bitmap_info
.offset
);
1774 sb
->feature_map
= cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
);
1777 if (rdev
->raid_disk
>= 0 &&
1778 !test_bit(In_sync
, &rdev
->flags
)) {
1780 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET
);
1781 sb
->recovery_offset
=
1782 cpu_to_le64(rdev
->recovery_offset
);
1784 if (test_bit(Replacement
, &rdev
->flags
))
1786 cpu_to_le32(MD_FEATURE_REPLACEMENT
);
1788 if (mddev
->reshape_position
!= MaxSector
) {
1789 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE
);
1790 sb
->reshape_position
= cpu_to_le64(mddev
->reshape_position
);
1791 sb
->new_layout
= cpu_to_le32(mddev
->new_layout
);
1792 sb
->delta_disks
= cpu_to_le32(mddev
->delta_disks
);
1793 sb
->new_level
= cpu_to_le32(mddev
->new_level
);
1794 sb
->new_chunk
= cpu_to_le32(mddev
->new_chunk_sectors
);
1795 if (mddev
->delta_disks
== 0 &&
1796 mddev
->reshape_backwards
)
1798 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS
);
1799 if (rdev
->new_data_offset
!= rdev
->data_offset
) {
1801 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET
);
1802 sb
->new_offset
= cpu_to_le32((__u32
)(rdev
->new_data_offset
1803 - rdev
->data_offset
));
1807 if (rdev
->badblocks
.count
== 0)
1808 /* Nothing to do for bad blocks*/ ;
1809 else if (sb
->bblog_offset
== 0)
1810 /* Cannot record bad blocks on this device */
1811 md_error(mddev
, rdev
);
1813 struct badblocks
*bb
= &rdev
->badblocks
;
1814 u64
*bbp
= (u64
*)page_address(rdev
->bb_page
);
1816 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_BAD_BLOCKS
);
1821 seq
= read_seqbegin(&bb
->lock
);
1823 memset(bbp
, 0xff, PAGE_SIZE
);
1825 for (i
= 0 ; i
< bb
->count
; i
++) {
1826 u64 internal_bb
= p
[i
];
1827 u64 store_bb
= ((BB_OFFSET(internal_bb
) << 10)
1828 | BB_LEN(internal_bb
));
1829 bbp
[i
] = cpu_to_le64(store_bb
);
1832 if (read_seqretry(&bb
->lock
, seq
))
1835 bb
->sector
= (rdev
->sb_start
+
1836 (int)le32_to_cpu(sb
->bblog_offset
));
1837 bb
->size
= le16_to_cpu(sb
->bblog_size
);
1842 rdev_for_each(rdev2
, mddev
)
1843 if (rdev2
->desc_nr
+1 > max_dev
)
1844 max_dev
= rdev2
->desc_nr
+1;
1846 if (max_dev
> le32_to_cpu(sb
->max_dev
)) {
1848 sb
->max_dev
= cpu_to_le32(max_dev
);
1849 rdev
->sb_size
= max_dev
* 2 + 256;
1850 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1851 if (rdev
->sb_size
& bmask
)
1852 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1854 max_dev
= le32_to_cpu(sb
->max_dev
);
1856 for (i
=0; i
<max_dev
;i
++)
1857 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1859 rdev_for_each(rdev2
, mddev
) {
1861 if (test_bit(Faulty
, &rdev2
->flags
))
1862 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1863 else if (test_bit(In_sync
, &rdev2
->flags
))
1864 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1865 else if (rdev2
->raid_disk
>= 0)
1866 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1868 sb
->dev_roles
[i
] = cpu_to_le16(0xffff);
1871 sb
->sb_csum
= calc_sb_1_csum(sb
);
1874 static unsigned long long
1875 super_1_rdev_size_change(struct md_rdev
*rdev
, sector_t num_sectors
)
1877 struct mdp_superblock_1
*sb
;
1878 sector_t max_sectors
;
1879 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1880 return 0; /* component must fit device */
1881 if (rdev
->data_offset
!= rdev
->new_data_offset
)
1882 return 0; /* too confusing */
1883 if (rdev
->sb_start
< rdev
->data_offset
) {
1884 /* minor versions 1 and 2; superblock before data */
1885 max_sectors
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1886 max_sectors
-= rdev
->data_offset
;
1887 if (!num_sectors
|| num_sectors
> max_sectors
)
1888 num_sectors
= max_sectors
;
1889 } else if (rdev
->mddev
->bitmap_info
.offset
) {
1890 /* minor version 0 with bitmap we can't move */
1893 /* minor version 0; superblock after data */
1895 sb_start
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) - 8*2;
1896 sb_start
&= ~(sector_t
)(4*2 - 1);
1897 max_sectors
= rdev
->sectors
+ sb_start
- rdev
->sb_start
;
1898 if (!num_sectors
|| num_sectors
> max_sectors
)
1899 num_sectors
= max_sectors
;
1900 rdev
->sb_start
= sb_start
;
1902 sb
= page_address(rdev
->sb_page
);
1903 sb
->data_size
= cpu_to_le64(num_sectors
);
1904 sb
->super_offset
= rdev
->sb_start
;
1905 sb
->sb_csum
= calc_sb_1_csum(sb
);
1906 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1908 md_super_wait(rdev
->mddev
);
1914 super_1_allow_new_offset(struct md_rdev
*rdev
,
1915 unsigned long long new_offset
)
1917 /* All necessary checks on new >= old have been done */
1918 struct bitmap
*bitmap
;
1919 if (new_offset
>= rdev
->data_offset
)
1922 /* with 1.0 metadata, there is no metadata to tread on
1923 * so we can always move back */
1924 if (rdev
->mddev
->minor_version
== 0)
1927 /* otherwise we must be sure not to step on
1928 * any metadata, so stay:
1929 * 36K beyond start of superblock
1930 * beyond end of badblocks
1931 * beyond write-intent bitmap
1933 if (rdev
->sb_start
+ (32+4)*2 > new_offset
)
1935 bitmap
= rdev
->mddev
->bitmap
;
1936 if (bitmap
&& !rdev
->mddev
->bitmap_info
.file
&&
1937 rdev
->sb_start
+ rdev
->mddev
->bitmap_info
.offset
+
1938 bitmap
->storage
.file_pages
* (PAGE_SIZE
>>9) > new_offset
)
1940 if (rdev
->badblocks
.sector
+ rdev
->badblocks
.size
> new_offset
)
1946 static struct super_type super_types
[] = {
1949 .owner
= THIS_MODULE
,
1950 .load_super
= super_90_load
,
1951 .validate_super
= super_90_validate
,
1952 .sync_super
= super_90_sync
,
1953 .rdev_size_change
= super_90_rdev_size_change
,
1954 .allow_new_offset
= super_90_allow_new_offset
,
1958 .owner
= THIS_MODULE
,
1959 .load_super
= super_1_load
,
1960 .validate_super
= super_1_validate
,
1961 .sync_super
= super_1_sync
,
1962 .rdev_size_change
= super_1_rdev_size_change
,
1963 .allow_new_offset
= super_1_allow_new_offset
,
1967 static void sync_super(struct mddev
*mddev
, struct md_rdev
*rdev
)
1969 if (mddev
->sync_super
) {
1970 mddev
->sync_super(mddev
, rdev
);
1974 BUG_ON(mddev
->major_version
>= ARRAY_SIZE(super_types
));
1976 super_types
[mddev
->major_version
].sync_super(mddev
, rdev
);
1979 static int match_mddev_units(struct mddev
*mddev1
, struct mddev
*mddev2
)
1981 struct md_rdev
*rdev
, *rdev2
;
1984 rdev_for_each_rcu(rdev
, mddev1
)
1985 rdev_for_each_rcu(rdev2
, mddev2
)
1986 if (rdev
->bdev
->bd_contains
==
1987 rdev2
->bdev
->bd_contains
) {
1995 static LIST_HEAD(pending_raid_disks
);
1998 * Try to register data integrity profile for an mddev
2000 * This is called when an array is started and after a disk has been kicked
2001 * from the array. It only succeeds if all working and active component devices
2002 * are integrity capable with matching profiles.
2004 int md_integrity_register(struct mddev
*mddev
)
2006 struct md_rdev
*rdev
, *reference
= NULL
;
2008 if (list_empty(&mddev
->disks
))
2009 return 0; /* nothing to do */
2010 if (!mddev
->gendisk
|| blk_get_integrity(mddev
->gendisk
))
2011 return 0; /* shouldn't register, or already is */
2012 rdev_for_each(rdev
, mddev
) {
2013 /* skip spares and non-functional disks */
2014 if (test_bit(Faulty
, &rdev
->flags
))
2016 if (rdev
->raid_disk
< 0)
2019 /* Use the first rdev as the reference */
2023 /* does this rdev's profile match the reference profile? */
2024 if (blk_integrity_compare(reference
->bdev
->bd_disk
,
2025 rdev
->bdev
->bd_disk
) < 0)
2028 if (!reference
|| !bdev_get_integrity(reference
->bdev
))
2031 * All component devices are integrity capable and have matching
2032 * profiles, register the common profile for the md device.
2034 if (blk_integrity_register(mddev
->gendisk
,
2035 bdev_get_integrity(reference
->bdev
)) != 0) {
2036 printk(KERN_ERR
"md: failed to register integrity for %s\n",
2040 printk(KERN_NOTICE
"md: data integrity enabled on %s\n", mdname(mddev
));
2041 if (bioset_integrity_create(mddev
->bio_set
, BIO_POOL_SIZE
)) {
2042 printk(KERN_ERR
"md: failed to create integrity pool for %s\n",
2048 EXPORT_SYMBOL(md_integrity_register
);
2050 /* Disable data integrity if non-capable/non-matching disk is being added */
2051 void md_integrity_add_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
2053 struct blk_integrity
*bi_rdev
;
2054 struct blk_integrity
*bi_mddev
;
2056 if (!mddev
->gendisk
)
2059 bi_rdev
= bdev_get_integrity(rdev
->bdev
);
2060 bi_mddev
= blk_get_integrity(mddev
->gendisk
);
2062 if (!bi_mddev
) /* nothing to do */
2064 if (rdev
->raid_disk
< 0) /* skip spares */
2066 if (bi_rdev
&& blk_integrity_compare(mddev
->gendisk
,
2067 rdev
->bdev
->bd_disk
) >= 0)
2069 printk(KERN_NOTICE
"disabling data integrity on %s\n", mdname(mddev
));
2070 blk_integrity_unregister(mddev
->gendisk
);
2072 EXPORT_SYMBOL(md_integrity_add_rdev
);
2074 static int bind_rdev_to_array(struct md_rdev
* rdev
, struct mddev
* mddev
)
2076 char b
[BDEVNAME_SIZE
];
2086 /* prevent duplicates */
2087 if (find_rdev(mddev
, rdev
->bdev
->bd_dev
))
2090 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2091 if (rdev
->sectors
&& (mddev
->dev_sectors
== 0 ||
2092 rdev
->sectors
< mddev
->dev_sectors
)) {
2094 /* Cannot change size, so fail
2095 * If mddev->level <= 0, then we don't care
2096 * about aligning sizes (e.g. linear)
2098 if (mddev
->level
> 0)
2101 mddev
->dev_sectors
= rdev
->sectors
;
2104 /* Verify rdev->desc_nr is unique.
2105 * If it is -1, assign a free number, else
2106 * check number is not in use
2108 if (rdev
->desc_nr
< 0) {
2110 if (mddev
->pers
) choice
= mddev
->raid_disks
;
2111 while (find_rdev_nr(mddev
, choice
))
2113 rdev
->desc_nr
= choice
;
2115 if (find_rdev_nr(mddev
, rdev
->desc_nr
))
2118 if (mddev
->max_disks
&& rdev
->desc_nr
>= mddev
->max_disks
) {
2119 printk(KERN_WARNING
"md: %s: array is limited to %d devices\n",
2120 mdname(mddev
), mddev
->max_disks
);
2123 bdevname(rdev
->bdev
,b
);
2124 while ( (s
=strchr(b
, '/')) != NULL
)
2127 rdev
->mddev
= mddev
;
2128 printk(KERN_INFO
"md: bind<%s>\n", b
);
2130 if ((err
= kobject_add(&rdev
->kobj
, &mddev
->kobj
, "dev-%s", b
)))
2133 ko
= &part_to_dev(rdev
->bdev
->bd_part
)->kobj
;
2134 if (sysfs_create_link(&rdev
->kobj
, ko
, "block"))
2135 /* failure here is OK */;
2136 rdev
->sysfs_state
= sysfs_get_dirent_safe(rdev
->kobj
.sd
, "state");
2138 list_add_rcu(&rdev
->same_set
, &mddev
->disks
);
2139 bd_link_disk_holder(rdev
->bdev
, mddev
->gendisk
);
2141 /* May as well allow recovery to be retried once */
2142 mddev
->recovery_disabled
++;
2147 printk(KERN_WARNING
"md: failed to register dev-%s for %s\n",
2152 static void md_delayed_delete(struct work_struct
*ws
)
2154 struct md_rdev
*rdev
= container_of(ws
, struct md_rdev
, del_work
);
2155 kobject_del(&rdev
->kobj
);
2156 kobject_put(&rdev
->kobj
);
2159 static void unbind_rdev_from_array(struct md_rdev
* rdev
)
2161 char b
[BDEVNAME_SIZE
];
2166 bd_unlink_disk_holder(rdev
->bdev
, rdev
->mddev
->gendisk
);
2167 list_del_rcu(&rdev
->same_set
);
2168 printk(KERN_INFO
"md: unbind<%s>\n", bdevname(rdev
->bdev
,b
));
2170 sysfs_remove_link(&rdev
->kobj
, "block");
2171 sysfs_put(rdev
->sysfs_state
);
2172 rdev
->sysfs_state
= NULL
;
2173 rdev
->badblocks
.count
= 0;
2174 /* We need to delay this, otherwise we can deadlock when
2175 * writing to 'remove' to "dev/state". We also need
2176 * to delay it due to rcu usage.
2179 INIT_WORK(&rdev
->del_work
, md_delayed_delete
);
2180 kobject_get(&rdev
->kobj
);
2181 queue_work(md_misc_wq
, &rdev
->del_work
);
2185 * prevent the device from being mounted, repartitioned or
2186 * otherwise reused by a RAID array (or any other kernel
2187 * subsystem), by bd_claiming the device.
2189 static int lock_rdev(struct md_rdev
*rdev
, dev_t dev
, int shared
)
2192 struct block_device
*bdev
;
2193 char b
[BDEVNAME_SIZE
];
2195 bdev
= blkdev_get_by_dev(dev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
,
2196 shared
? (struct md_rdev
*)lock_rdev
: rdev
);
2198 printk(KERN_ERR
"md: could not open %s.\n",
2199 __bdevname(dev
, b
));
2200 return PTR_ERR(bdev
);
2206 static void unlock_rdev(struct md_rdev
*rdev
)
2208 struct block_device
*bdev
= rdev
->bdev
;
2212 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
);
2215 void md_autodetect_dev(dev_t dev
);
2217 static void export_rdev(struct md_rdev
* rdev
)
2219 char b
[BDEVNAME_SIZE
];
2220 printk(KERN_INFO
"md: export_rdev(%s)\n",
2221 bdevname(rdev
->bdev
,b
));
2224 md_rdev_clear(rdev
);
2226 if (test_bit(AutoDetected
, &rdev
->flags
))
2227 md_autodetect_dev(rdev
->bdev
->bd_dev
);
2230 kobject_put(&rdev
->kobj
);
2233 static void kick_rdev_from_array(struct md_rdev
* rdev
)
2235 unbind_rdev_from_array(rdev
);
2239 static void export_array(struct mddev
*mddev
)
2241 struct md_rdev
*rdev
, *tmp
;
2243 rdev_for_each_safe(rdev
, tmp
, mddev
) {
2248 kick_rdev_from_array(rdev
);
2250 if (!list_empty(&mddev
->disks
))
2252 mddev
->raid_disks
= 0;
2253 mddev
->major_version
= 0;
2256 static void print_desc(mdp_disk_t
*desc
)
2258 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc
->number
,
2259 desc
->major
,desc
->minor
,desc
->raid_disk
,desc
->state
);
2262 static void print_sb_90(mdp_super_t
*sb
)
2267 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
2268 sb
->major_version
, sb
->minor_version
, sb
->patch_version
,
2269 sb
->set_uuid0
, sb
->set_uuid1
, sb
->set_uuid2
, sb
->set_uuid3
,
2271 printk(KERN_INFO
"md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
2272 sb
->level
, sb
->size
, sb
->nr_disks
, sb
->raid_disks
,
2273 sb
->md_minor
, sb
->layout
, sb
->chunk_size
);
2274 printk(KERN_INFO
"md: UT:%08x ST:%d AD:%d WD:%d"
2275 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
2276 sb
->utime
, sb
->state
, sb
->active_disks
, sb
->working_disks
,
2277 sb
->failed_disks
, sb
->spare_disks
,
2278 sb
->sb_csum
, (unsigned long)sb
->events_lo
);
2281 for (i
= 0; i
< MD_SB_DISKS
; i
++) {
2284 desc
= sb
->disks
+ i
;
2285 if (desc
->number
|| desc
->major
|| desc
->minor
||
2286 desc
->raid_disk
|| (desc
->state
&& (desc
->state
!= 4))) {
2287 printk(" D %2d: ", i
);
2291 printk(KERN_INFO
"md: THIS: ");
2292 print_desc(&sb
->this_disk
);
2295 static void print_sb_1(struct mdp_superblock_1
*sb
)
2299 uuid
= sb
->set_uuid
;
2301 "md: SB: (V:%u) (F:0x%08x) Array-ID:<%pU>\n"
2302 "md: Name: \"%s\" CT:%llu\n",
2303 le32_to_cpu(sb
->major_version
),
2304 le32_to_cpu(sb
->feature_map
),
2307 (unsigned long long)le64_to_cpu(sb
->ctime
)
2308 & MD_SUPERBLOCK_1_TIME_SEC_MASK
);
2310 uuid
= sb
->device_uuid
;
2312 "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu"
2314 "md: Dev:%08x UUID: %pU\n"
2315 "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n"
2316 "md: (MaxDev:%u) \n",
2317 le32_to_cpu(sb
->level
),
2318 (unsigned long long)le64_to_cpu(sb
->size
),
2319 le32_to_cpu(sb
->raid_disks
),
2320 le32_to_cpu(sb
->layout
),
2321 le32_to_cpu(sb
->chunksize
),
2322 (unsigned long long)le64_to_cpu(sb
->data_offset
),
2323 (unsigned long long)le64_to_cpu(sb
->data_size
),
2324 (unsigned long long)le64_to_cpu(sb
->super_offset
),
2325 (unsigned long long)le64_to_cpu(sb
->recovery_offset
),
2326 le32_to_cpu(sb
->dev_number
),
2329 (unsigned long long)le64_to_cpu(sb
->utime
) & MD_SUPERBLOCK_1_TIME_SEC_MASK
,
2330 (unsigned long long)le64_to_cpu(sb
->events
),
2331 (unsigned long long)le64_to_cpu(sb
->resync_offset
),
2332 le32_to_cpu(sb
->sb_csum
),
2333 le32_to_cpu(sb
->max_dev
)
2337 static void print_rdev(struct md_rdev
*rdev
, int major_version
)
2339 char b
[BDEVNAME_SIZE
];
2340 printk(KERN_INFO
"md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n",
2341 bdevname(rdev
->bdev
, b
), (unsigned long long)rdev
->sectors
,
2342 test_bit(Faulty
, &rdev
->flags
), test_bit(In_sync
, &rdev
->flags
),
2344 if (rdev
->sb_loaded
) {
2345 printk(KERN_INFO
"md: rdev superblock (MJ:%d):\n", major_version
);
2346 switch (major_version
) {
2348 print_sb_90(page_address(rdev
->sb_page
));
2351 print_sb_1(page_address(rdev
->sb_page
));
2355 printk(KERN_INFO
"md: no rdev superblock!\n");
2358 static void md_print_devices(void)
2360 struct list_head
*tmp
;
2361 struct md_rdev
*rdev
;
2362 struct mddev
*mddev
;
2363 char b
[BDEVNAME_SIZE
];
2366 printk("md: **********************************\n");
2367 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
2368 printk("md: **********************************\n");
2369 for_each_mddev(mddev
, tmp
) {
2372 bitmap_print_sb(mddev
->bitmap
);
2374 printk("%s: ", mdname(mddev
));
2375 rdev_for_each(rdev
, mddev
)
2376 printk("<%s>", bdevname(rdev
->bdev
,b
));
2379 rdev_for_each(rdev
, mddev
)
2380 print_rdev(rdev
, mddev
->major_version
);
2382 printk("md: **********************************\n");
2387 static void sync_sbs(struct mddev
* mddev
, int nospares
)
2389 /* Update each superblock (in-memory image), but
2390 * if we are allowed to, skip spares which already
2391 * have the right event counter, or have one earlier
2392 * (which would mean they aren't being marked as dirty
2393 * with the rest of the array)
2395 struct md_rdev
*rdev
;
2396 rdev_for_each(rdev
, mddev
) {
2397 if (rdev
->sb_events
== mddev
->events
||
2399 rdev
->raid_disk
< 0 &&
2400 rdev
->sb_events
+1 == mddev
->events
)) {
2401 /* Don't update this superblock */
2402 rdev
->sb_loaded
= 2;
2404 sync_super(mddev
, rdev
);
2405 rdev
->sb_loaded
= 1;
2410 static void md_update_sb(struct mddev
* mddev
, int force_change
)
2412 struct md_rdev
*rdev
;
2415 int any_badblocks_changed
= 0;
2419 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
2423 /* First make sure individual recovery_offsets are correct */
2424 rdev_for_each(rdev
, mddev
) {
2425 if (rdev
->raid_disk
>= 0 &&
2426 mddev
->delta_disks
>= 0 &&
2427 !test_bit(In_sync
, &rdev
->flags
) &&
2428 mddev
->curr_resync_completed
> rdev
->recovery_offset
)
2429 rdev
->recovery_offset
= mddev
->curr_resync_completed
;
2432 if (!mddev
->persistent
) {
2433 clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
2434 clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
2435 if (!mddev
->external
) {
2436 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2437 rdev_for_each(rdev
, mddev
) {
2438 if (rdev
->badblocks
.changed
) {
2439 rdev
->badblocks
.changed
= 0;
2440 md_ack_all_badblocks(&rdev
->badblocks
);
2441 md_error(mddev
, rdev
);
2443 clear_bit(Blocked
, &rdev
->flags
);
2444 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2445 wake_up(&rdev
->blocked_wait
);
2448 wake_up(&mddev
->sb_wait
);
2452 spin_lock_irq(&mddev
->write_lock
);
2454 mddev
->utime
= get_seconds();
2456 if (test_and_clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
))
2458 if (test_and_clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
2459 /* just a clean<-> dirty transition, possibly leave spares alone,
2460 * though if events isn't the right even/odd, we will have to do
2466 if (mddev
->degraded
)
2467 /* If the array is degraded, then skipping spares is both
2468 * dangerous and fairly pointless.
2469 * Dangerous because a device that was removed from the array
2470 * might have a event_count that still looks up-to-date,
2471 * so it can be re-added without a resync.
2472 * Pointless because if there are any spares to skip,
2473 * then a recovery will happen and soon that array won't
2474 * be degraded any more and the spare can go back to sleep then.
2478 sync_req
= mddev
->in_sync
;
2480 /* If this is just a dirty<->clean transition, and the array is clean
2481 * and 'events' is odd, we can roll back to the previous clean state */
2483 && (mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
2484 && mddev
->can_decrease_events
2485 && mddev
->events
!= 1) {
2487 mddev
->can_decrease_events
= 0;
2489 /* otherwise we have to go forward and ... */
2491 mddev
->can_decrease_events
= nospares
;
2494 if (!mddev
->events
) {
2496 * oops, this 64-bit counter should never wrap.
2497 * Either we are in around ~1 trillion A.C., assuming
2498 * 1 reboot per second, or we have a bug:
2504 rdev_for_each(rdev
, mddev
) {
2505 if (rdev
->badblocks
.changed
)
2506 any_badblocks_changed
++;
2507 if (test_bit(Faulty
, &rdev
->flags
))
2508 set_bit(FaultRecorded
, &rdev
->flags
);
2511 sync_sbs(mddev
, nospares
);
2512 spin_unlock_irq(&mddev
->write_lock
);
2514 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2515 mdname(mddev
), mddev
->in_sync
);
2517 bitmap_update_sb(mddev
->bitmap
);
2518 rdev_for_each(rdev
, mddev
) {
2519 char b
[BDEVNAME_SIZE
];
2521 if (rdev
->sb_loaded
!= 1)
2522 continue; /* no noise on spare devices */
2524 if (!test_bit(Faulty
, &rdev
->flags
) &&
2525 rdev
->saved_raid_disk
== -1) {
2526 md_super_write(mddev
,rdev
,
2527 rdev
->sb_start
, rdev
->sb_size
,
2529 pr_debug("md: (write) %s's sb offset: %llu\n",
2530 bdevname(rdev
->bdev
, b
),
2531 (unsigned long long)rdev
->sb_start
);
2532 rdev
->sb_events
= mddev
->events
;
2533 if (rdev
->badblocks
.size
) {
2534 md_super_write(mddev
, rdev
,
2535 rdev
->badblocks
.sector
,
2536 rdev
->badblocks
.size
<< 9,
2538 rdev
->badblocks
.size
= 0;
2541 } else if (test_bit(Faulty
, &rdev
->flags
))
2542 pr_debug("md: %s (skipping faulty)\n",
2543 bdevname(rdev
->bdev
, b
));
2545 pr_debug("(skipping incremental s/r ");
2547 if (mddev
->level
== LEVEL_MULTIPATH
)
2548 /* only need to write one superblock... */
2551 md_super_wait(mddev
);
2552 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2554 spin_lock_irq(&mddev
->write_lock
);
2555 if (mddev
->in_sync
!= sync_req
||
2556 test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
2557 /* have to write it out again */
2558 spin_unlock_irq(&mddev
->write_lock
);
2561 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2562 spin_unlock_irq(&mddev
->write_lock
);
2563 wake_up(&mddev
->sb_wait
);
2564 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
2565 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
2567 rdev_for_each(rdev
, mddev
) {
2568 if (test_and_clear_bit(FaultRecorded
, &rdev
->flags
))
2569 clear_bit(Blocked
, &rdev
->flags
);
2571 if (any_badblocks_changed
)
2572 md_ack_all_badblocks(&rdev
->badblocks
);
2573 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2574 wake_up(&rdev
->blocked_wait
);
2578 /* words written to sysfs files may, or may not, be \n terminated.
2579 * We want to accept with case. For this we use cmd_match.
2581 static int cmd_match(const char *cmd
, const char *str
)
2583 /* See if cmd, written into a sysfs file, matches
2584 * str. They must either be the same, or cmd can
2585 * have a trailing newline
2587 while (*cmd
&& *str
&& *cmd
== *str
) {
2598 struct rdev_sysfs_entry
{
2599 struct attribute attr
;
2600 ssize_t (*show
)(struct md_rdev
*, char *);
2601 ssize_t (*store
)(struct md_rdev
*, const char *, size_t);
2605 state_show(struct md_rdev
*rdev
, char *page
)
2610 if (test_bit(Faulty
, &rdev
->flags
) ||
2611 rdev
->badblocks
.unacked_exist
) {
2612 len
+= sprintf(page
+len
, "%sfaulty",sep
);
2615 if (test_bit(In_sync
, &rdev
->flags
)) {
2616 len
+= sprintf(page
+len
, "%sin_sync",sep
);
2619 if (test_bit(WriteMostly
, &rdev
->flags
)) {
2620 len
+= sprintf(page
+len
, "%swrite_mostly",sep
);
2623 if (test_bit(Blocked
, &rdev
->flags
) ||
2624 (rdev
->badblocks
.unacked_exist
2625 && !test_bit(Faulty
, &rdev
->flags
))) {
2626 len
+= sprintf(page
+len
, "%sblocked", sep
);
2629 if (!test_bit(Faulty
, &rdev
->flags
) &&
2630 !test_bit(In_sync
, &rdev
->flags
)) {
2631 len
+= sprintf(page
+len
, "%sspare", sep
);
2634 if (test_bit(WriteErrorSeen
, &rdev
->flags
)) {
2635 len
+= sprintf(page
+len
, "%swrite_error", sep
);
2638 if (test_bit(WantReplacement
, &rdev
->flags
)) {
2639 len
+= sprintf(page
+len
, "%swant_replacement", sep
);
2642 if (test_bit(Replacement
, &rdev
->flags
)) {
2643 len
+= sprintf(page
+len
, "%sreplacement", sep
);
2647 return len
+sprintf(page
+len
, "\n");
2651 state_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2654 * faulty - simulates an error
2655 * remove - disconnects the device
2656 * writemostly - sets write_mostly
2657 * -writemostly - clears write_mostly
2658 * blocked - sets the Blocked flags
2659 * -blocked - clears the Blocked and possibly simulates an error
2660 * insync - sets Insync providing device isn't active
2661 * write_error - sets WriteErrorSeen
2662 * -write_error - clears WriteErrorSeen
2665 if (cmd_match(buf
, "faulty") && rdev
->mddev
->pers
) {
2666 md_error(rdev
->mddev
, rdev
);
2667 if (test_bit(Faulty
, &rdev
->flags
))
2671 } else if (cmd_match(buf
, "remove")) {
2672 if (rdev
->raid_disk
>= 0)
2675 struct mddev
*mddev
= rdev
->mddev
;
2676 kick_rdev_from_array(rdev
);
2678 md_update_sb(mddev
, 1);
2679 md_new_event(mddev
);
2682 } else if (cmd_match(buf
, "writemostly")) {
2683 set_bit(WriteMostly
, &rdev
->flags
);
2685 } else if (cmd_match(buf
, "-writemostly")) {
2686 clear_bit(WriteMostly
, &rdev
->flags
);
2688 } else if (cmd_match(buf
, "blocked")) {
2689 set_bit(Blocked
, &rdev
->flags
);
2691 } else if (cmd_match(buf
, "-blocked")) {
2692 if (!test_bit(Faulty
, &rdev
->flags
) &&
2693 rdev
->badblocks
.unacked_exist
) {
2694 /* metadata handler doesn't understand badblocks,
2695 * so we need to fail the device
2697 md_error(rdev
->mddev
, rdev
);
2699 clear_bit(Blocked
, &rdev
->flags
);
2700 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2701 wake_up(&rdev
->blocked_wait
);
2702 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2703 md_wakeup_thread(rdev
->mddev
->thread
);
2706 } else if (cmd_match(buf
, "insync") && rdev
->raid_disk
== -1) {
2707 set_bit(In_sync
, &rdev
->flags
);
2709 } else if (cmd_match(buf
, "write_error")) {
2710 set_bit(WriteErrorSeen
, &rdev
->flags
);
2712 } else if (cmd_match(buf
, "-write_error")) {
2713 clear_bit(WriteErrorSeen
, &rdev
->flags
);
2715 } else if (cmd_match(buf
, "want_replacement")) {
2716 /* Any non-spare device that is not a replacement can
2717 * become want_replacement at any time, but we then need to
2718 * check if recovery is needed.
2720 if (rdev
->raid_disk
>= 0 &&
2721 !test_bit(Replacement
, &rdev
->flags
))
2722 set_bit(WantReplacement
, &rdev
->flags
);
2723 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2724 md_wakeup_thread(rdev
->mddev
->thread
);
2726 } else if (cmd_match(buf
, "-want_replacement")) {
2727 /* Clearing 'want_replacement' is always allowed.
2728 * Once replacements starts it is too late though.
2731 clear_bit(WantReplacement
, &rdev
->flags
);
2732 } else if (cmd_match(buf
, "replacement")) {
2733 /* Can only set a device as a replacement when array has not
2734 * yet been started. Once running, replacement is automatic
2735 * from spares, or by assigning 'slot'.
2737 if (rdev
->mddev
->pers
)
2740 set_bit(Replacement
, &rdev
->flags
);
2743 } else if (cmd_match(buf
, "-replacement")) {
2744 /* Similarly, can only clear Replacement before start */
2745 if (rdev
->mddev
->pers
)
2748 clear_bit(Replacement
, &rdev
->flags
);
2753 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2754 return err
? err
: len
;
2756 static struct rdev_sysfs_entry rdev_state
=
2757 __ATTR(state
, S_IRUGO
|S_IWUSR
, state_show
, state_store
);
2760 errors_show(struct md_rdev
*rdev
, char *page
)
2762 return sprintf(page
, "%d\n", atomic_read(&rdev
->corrected_errors
));
2766 errors_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2769 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2770 if (*buf
&& (*e
== 0 || *e
== '\n')) {
2771 atomic_set(&rdev
->corrected_errors
, n
);
2776 static struct rdev_sysfs_entry rdev_errors
=
2777 __ATTR(errors
, S_IRUGO
|S_IWUSR
, errors_show
, errors_store
);
2780 slot_show(struct md_rdev
*rdev
, char *page
)
2782 if (rdev
->raid_disk
< 0)
2783 return sprintf(page
, "none\n");
2785 return sprintf(page
, "%d\n", rdev
->raid_disk
);
2789 slot_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2793 int slot
= simple_strtoul(buf
, &e
, 10);
2794 if (strncmp(buf
, "none", 4)==0)
2796 else if (e
==buf
|| (*e
&& *e
!= '\n'))
2798 if (rdev
->mddev
->pers
&& slot
== -1) {
2799 /* Setting 'slot' on an active array requires also
2800 * updating the 'rd%d' link, and communicating
2801 * with the personality with ->hot_*_disk.
2802 * For now we only support removing
2803 * failed/spare devices. This normally happens automatically,
2804 * but not when the metadata is externally managed.
2806 if (rdev
->raid_disk
== -1)
2808 /* personality does all needed checks */
2809 if (rdev
->mddev
->pers
->hot_remove_disk
== NULL
)
2811 clear_bit(Blocked
, &rdev
->flags
);
2812 remove_and_add_spares(rdev
->mddev
, rdev
);
2813 if (rdev
->raid_disk
>= 0)
2815 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2816 md_wakeup_thread(rdev
->mddev
->thread
);
2817 } else if (rdev
->mddev
->pers
) {
2818 /* Activating a spare .. or possibly reactivating
2819 * if we ever get bitmaps working here.
2822 if (rdev
->raid_disk
!= -1)
2825 if (test_bit(MD_RECOVERY_RUNNING
, &rdev
->mddev
->recovery
))
2828 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
2831 if (slot
>= rdev
->mddev
->raid_disks
&&
2832 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
2835 rdev
->raid_disk
= slot
;
2836 if (test_bit(In_sync
, &rdev
->flags
))
2837 rdev
->saved_raid_disk
= slot
;
2839 rdev
->saved_raid_disk
= -1;
2840 clear_bit(In_sync
, &rdev
->flags
);
2841 err
= rdev
->mddev
->pers
->
2842 hot_add_disk(rdev
->mddev
, rdev
);
2844 rdev
->raid_disk
= -1;
2847 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2848 if (sysfs_link_rdev(rdev
->mddev
, rdev
))
2849 /* failure here is OK */;
2850 /* don't wakeup anyone, leave that to userspace. */
2852 if (slot
>= rdev
->mddev
->raid_disks
&&
2853 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
2855 rdev
->raid_disk
= slot
;
2856 /* assume it is working */
2857 clear_bit(Faulty
, &rdev
->flags
);
2858 clear_bit(WriteMostly
, &rdev
->flags
);
2859 set_bit(In_sync
, &rdev
->flags
);
2860 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2866 static struct rdev_sysfs_entry rdev_slot
=
2867 __ATTR(slot
, S_IRUGO
|S_IWUSR
, slot_show
, slot_store
);
2870 offset_show(struct md_rdev
*rdev
, char *page
)
2872 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->data_offset
);
2876 offset_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2878 unsigned long long offset
;
2879 if (kstrtoull(buf
, 10, &offset
) < 0)
2881 if (rdev
->mddev
->pers
&& rdev
->raid_disk
>= 0)
2883 if (rdev
->sectors
&& rdev
->mddev
->external
)
2884 /* Must set offset before size, so overlap checks
2887 rdev
->data_offset
= offset
;
2888 rdev
->new_data_offset
= offset
;
2892 static struct rdev_sysfs_entry rdev_offset
=
2893 __ATTR(offset
, S_IRUGO
|S_IWUSR
, offset_show
, offset_store
);
2895 static ssize_t
new_offset_show(struct md_rdev
*rdev
, char *page
)
2897 return sprintf(page
, "%llu\n",
2898 (unsigned long long)rdev
->new_data_offset
);
2901 static ssize_t
new_offset_store(struct md_rdev
*rdev
,
2902 const char *buf
, size_t len
)
2904 unsigned long long new_offset
;
2905 struct mddev
*mddev
= rdev
->mddev
;
2907 if (kstrtoull(buf
, 10, &new_offset
) < 0)
2910 if (mddev
->sync_thread
)
2912 if (new_offset
== rdev
->data_offset
)
2913 /* reset is always permitted */
2915 else if (new_offset
> rdev
->data_offset
) {
2916 /* must not push array size beyond rdev_sectors */
2917 if (new_offset
- rdev
->data_offset
2918 + mddev
->dev_sectors
> rdev
->sectors
)
2921 /* Metadata worries about other space details. */
2923 /* decreasing the offset is inconsistent with a backwards
2926 if (new_offset
< rdev
->data_offset
&&
2927 mddev
->reshape_backwards
)
2929 /* Increasing offset is inconsistent with forwards
2930 * reshape. reshape_direction should be set to
2931 * 'backwards' first.
2933 if (new_offset
> rdev
->data_offset
&&
2934 !mddev
->reshape_backwards
)
2937 if (mddev
->pers
&& mddev
->persistent
&&
2938 !super_types
[mddev
->major_version
]
2939 .allow_new_offset(rdev
, new_offset
))
2941 rdev
->new_data_offset
= new_offset
;
2942 if (new_offset
> rdev
->data_offset
)
2943 mddev
->reshape_backwards
= 1;
2944 else if (new_offset
< rdev
->data_offset
)
2945 mddev
->reshape_backwards
= 0;
2949 static struct rdev_sysfs_entry rdev_new_offset
=
2950 __ATTR(new_offset
, S_IRUGO
|S_IWUSR
, new_offset_show
, new_offset_store
);
2953 rdev_size_show(struct md_rdev
*rdev
, char *page
)
2955 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->sectors
/ 2);
2958 static int overlaps(sector_t s1
, sector_t l1
, sector_t s2
, sector_t l2
)
2960 /* check if two start/length pairs overlap */
2968 static int strict_blocks_to_sectors(const char *buf
, sector_t
*sectors
)
2970 unsigned long long blocks
;
2973 if (kstrtoull(buf
, 10, &blocks
) < 0)
2976 if (blocks
& 1ULL << (8 * sizeof(blocks
) - 1))
2977 return -EINVAL
; /* sector conversion overflow */
2980 if (new != blocks
* 2)
2981 return -EINVAL
; /* unsigned long long to sector_t overflow */
2988 rdev_size_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2990 struct mddev
*my_mddev
= rdev
->mddev
;
2991 sector_t oldsectors
= rdev
->sectors
;
2994 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
2996 if (rdev
->data_offset
!= rdev
->new_data_offset
)
2997 return -EINVAL
; /* too confusing */
2998 if (my_mddev
->pers
&& rdev
->raid_disk
>= 0) {
2999 if (my_mddev
->persistent
) {
3000 sectors
= super_types
[my_mddev
->major_version
].
3001 rdev_size_change(rdev
, sectors
);
3004 } else if (!sectors
)
3005 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) -
3007 if (!my_mddev
->pers
->resize
)
3008 /* Cannot change size for RAID0 or Linear etc */
3011 if (sectors
< my_mddev
->dev_sectors
)
3012 return -EINVAL
; /* component must fit device */
3014 rdev
->sectors
= sectors
;
3015 if (sectors
> oldsectors
&& my_mddev
->external
) {
3016 /* need to check that all other rdevs with the same ->bdev
3017 * do not overlap. We need to unlock the mddev to avoid
3018 * a deadlock. We have already changed rdev->sectors, and if
3019 * we have to change it back, we will have the lock again.
3021 struct mddev
*mddev
;
3023 struct list_head
*tmp
;
3025 mddev_unlock(my_mddev
);
3026 for_each_mddev(mddev
, tmp
) {
3027 struct md_rdev
*rdev2
;
3029 mddev_lock_nointr(mddev
);
3030 rdev_for_each(rdev2
, mddev
)
3031 if (rdev
->bdev
== rdev2
->bdev
&&
3033 overlaps(rdev
->data_offset
, rdev
->sectors
,
3039 mddev_unlock(mddev
);
3045 mddev_lock_nointr(my_mddev
);
3047 /* Someone else could have slipped in a size
3048 * change here, but doing so is just silly.
3049 * We put oldsectors back because we *know* it is
3050 * safe, and trust userspace not to race with
3053 rdev
->sectors
= oldsectors
;
3060 static struct rdev_sysfs_entry rdev_size
=
3061 __ATTR(size
, S_IRUGO
|S_IWUSR
, rdev_size_show
, rdev_size_store
);
3064 static ssize_t
recovery_start_show(struct md_rdev
*rdev
, char *page
)
3066 unsigned long long recovery_start
= rdev
->recovery_offset
;
3068 if (test_bit(In_sync
, &rdev
->flags
) ||
3069 recovery_start
== MaxSector
)
3070 return sprintf(page
, "none\n");
3072 return sprintf(page
, "%llu\n", recovery_start
);
3075 static ssize_t
recovery_start_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3077 unsigned long long recovery_start
;
3079 if (cmd_match(buf
, "none"))
3080 recovery_start
= MaxSector
;
3081 else if (kstrtoull(buf
, 10, &recovery_start
))
3084 if (rdev
->mddev
->pers
&&
3085 rdev
->raid_disk
>= 0)
3088 rdev
->recovery_offset
= recovery_start
;
3089 if (recovery_start
== MaxSector
)
3090 set_bit(In_sync
, &rdev
->flags
);
3092 clear_bit(In_sync
, &rdev
->flags
);
3096 static struct rdev_sysfs_entry rdev_recovery_start
=
3097 __ATTR(recovery_start
, S_IRUGO
|S_IWUSR
, recovery_start_show
, recovery_start_store
);
3101 badblocks_show(struct badblocks
*bb
, char *page
, int unack
);
3103 badblocks_store(struct badblocks
*bb
, const char *page
, size_t len
, int unack
);
3105 static ssize_t
bb_show(struct md_rdev
*rdev
, char *page
)
3107 return badblocks_show(&rdev
->badblocks
, page
, 0);
3109 static ssize_t
bb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
3111 int rv
= badblocks_store(&rdev
->badblocks
, page
, len
, 0);
3112 /* Maybe that ack was all we needed */
3113 if (test_and_clear_bit(BlockedBadBlocks
, &rdev
->flags
))
3114 wake_up(&rdev
->blocked_wait
);
3117 static struct rdev_sysfs_entry rdev_bad_blocks
=
3118 __ATTR(bad_blocks
, S_IRUGO
|S_IWUSR
, bb_show
, bb_store
);
3121 static ssize_t
ubb_show(struct md_rdev
*rdev
, char *page
)
3123 return badblocks_show(&rdev
->badblocks
, page
, 1);
3125 static ssize_t
ubb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
3127 return badblocks_store(&rdev
->badblocks
, page
, len
, 1);
3129 static struct rdev_sysfs_entry rdev_unack_bad_blocks
=
3130 __ATTR(unacknowledged_bad_blocks
, S_IRUGO
|S_IWUSR
, ubb_show
, ubb_store
);
3132 static struct attribute
*rdev_default_attrs
[] = {
3137 &rdev_new_offset
.attr
,
3139 &rdev_recovery_start
.attr
,
3140 &rdev_bad_blocks
.attr
,
3141 &rdev_unack_bad_blocks
.attr
,
3145 rdev_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
3147 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
3148 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
3149 struct mddev
*mddev
= rdev
->mddev
;
3155 rv
= mddev
? mddev_lock(mddev
) : -EBUSY
;
3157 if (rdev
->mddev
== NULL
)
3160 rv
= entry
->show(rdev
, page
);
3161 mddev_unlock(mddev
);
3167 rdev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
3168 const char *page
, size_t length
)
3170 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
3171 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
3173 struct mddev
*mddev
= rdev
->mddev
;
3177 if (!capable(CAP_SYS_ADMIN
))
3179 rv
= mddev
? mddev_lock(mddev
): -EBUSY
;
3181 if (rdev
->mddev
== NULL
)
3184 rv
= entry
->store(rdev
, page
, length
);
3185 mddev_unlock(mddev
);
3190 static void rdev_free(struct kobject
*ko
)
3192 struct md_rdev
*rdev
= container_of(ko
, struct md_rdev
, kobj
);
3195 static const struct sysfs_ops rdev_sysfs_ops
= {
3196 .show
= rdev_attr_show
,
3197 .store
= rdev_attr_store
,
3199 static struct kobj_type rdev_ktype
= {
3200 .release
= rdev_free
,
3201 .sysfs_ops
= &rdev_sysfs_ops
,
3202 .default_attrs
= rdev_default_attrs
,
3205 int md_rdev_init(struct md_rdev
*rdev
)
3208 rdev
->saved_raid_disk
= -1;
3209 rdev
->raid_disk
= -1;
3211 rdev
->data_offset
= 0;
3212 rdev
->new_data_offset
= 0;
3213 rdev
->sb_events
= 0;
3214 rdev
->last_read_error
.tv_sec
= 0;
3215 rdev
->last_read_error
.tv_nsec
= 0;
3216 rdev
->sb_loaded
= 0;
3217 rdev
->bb_page
= NULL
;
3218 atomic_set(&rdev
->nr_pending
, 0);
3219 atomic_set(&rdev
->read_errors
, 0);
3220 atomic_set(&rdev
->corrected_errors
, 0);
3222 INIT_LIST_HEAD(&rdev
->same_set
);
3223 init_waitqueue_head(&rdev
->blocked_wait
);
3225 /* Add space to store bad block list.
3226 * This reserves the space even on arrays where it cannot
3227 * be used - I wonder if that matters
3229 rdev
->badblocks
.count
= 0;
3230 rdev
->badblocks
.shift
= -1; /* disabled until explicitly enabled */
3231 rdev
->badblocks
.page
= kmalloc(PAGE_SIZE
, GFP_KERNEL
);
3232 seqlock_init(&rdev
->badblocks
.lock
);
3233 if (rdev
->badblocks
.page
== NULL
)
3238 EXPORT_SYMBOL_GPL(md_rdev_init
);
3240 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3242 * mark the device faulty if:
3244 * - the device is nonexistent (zero size)
3245 * - the device has no valid superblock
3247 * a faulty rdev _never_ has rdev->sb set.
3249 static struct md_rdev
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
3251 char b
[BDEVNAME_SIZE
];
3253 struct md_rdev
*rdev
;
3256 rdev
= kzalloc(sizeof(*rdev
), GFP_KERNEL
);
3258 printk(KERN_ERR
"md: could not alloc mem for new device!\n");
3259 return ERR_PTR(-ENOMEM
);
3262 err
= md_rdev_init(rdev
);
3265 err
= alloc_disk_sb(rdev
);
3269 err
= lock_rdev(rdev
, newdev
, super_format
== -2);
3273 kobject_init(&rdev
->kobj
, &rdev_ktype
);
3275 size
= i_size_read(rdev
->bdev
->bd_inode
) >> BLOCK_SIZE_BITS
;
3278 "md: %s has zero or unknown size, marking faulty!\n",
3279 bdevname(rdev
->bdev
,b
));
3284 if (super_format
>= 0) {
3285 err
= super_types
[super_format
].
3286 load_super(rdev
, NULL
, super_minor
);
3287 if (err
== -EINVAL
) {
3289 "md: %s does not have a valid v%d.%d "
3290 "superblock, not importing!\n",
3291 bdevname(rdev
->bdev
,b
),
3292 super_format
, super_minor
);
3297 "md: could not read %s's sb, not importing!\n",
3298 bdevname(rdev
->bdev
,b
));
3308 md_rdev_clear(rdev
);
3310 return ERR_PTR(err
);
3314 * Check a full RAID array for plausibility
3318 static void analyze_sbs(struct mddev
* mddev
)
3321 struct md_rdev
*rdev
, *freshest
, *tmp
;
3322 char b
[BDEVNAME_SIZE
];
3325 rdev_for_each_safe(rdev
, tmp
, mddev
)
3326 switch (super_types
[mddev
->major_version
].
3327 load_super(rdev
, freshest
, mddev
->minor_version
)) {
3335 "md: fatal superblock inconsistency in %s"
3336 " -- removing from array\n",
3337 bdevname(rdev
->bdev
,b
));
3338 kick_rdev_from_array(rdev
);
3342 super_types
[mddev
->major_version
].
3343 validate_super(mddev
, freshest
);
3346 rdev_for_each_safe(rdev
, tmp
, mddev
) {
3347 if (mddev
->max_disks
&&
3348 (rdev
->desc_nr
>= mddev
->max_disks
||
3349 i
> mddev
->max_disks
)) {
3351 "md: %s: %s: only %d devices permitted\n",
3352 mdname(mddev
), bdevname(rdev
->bdev
, b
),
3354 kick_rdev_from_array(rdev
);
3357 if (rdev
!= freshest
)
3358 if (super_types
[mddev
->major_version
].
3359 validate_super(mddev
, rdev
)) {
3360 printk(KERN_WARNING
"md: kicking non-fresh %s"
3362 bdevname(rdev
->bdev
,b
));
3363 kick_rdev_from_array(rdev
);
3366 if (mddev
->level
== LEVEL_MULTIPATH
) {
3367 rdev
->desc_nr
= i
++;
3368 rdev
->raid_disk
= rdev
->desc_nr
;
3369 set_bit(In_sync
, &rdev
->flags
);
3370 } else if (rdev
->raid_disk
>= (mddev
->raid_disks
- min(0, mddev
->delta_disks
))) {
3371 rdev
->raid_disk
= -1;
3372 clear_bit(In_sync
, &rdev
->flags
);
3377 /* Read a fixed-point number.
3378 * Numbers in sysfs attributes should be in "standard" units where
3379 * possible, so time should be in seconds.
3380 * However we internally use a a much smaller unit such as
3381 * milliseconds or jiffies.
3382 * This function takes a decimal number with a possible fractional
3383 * component, and produces an integer which is the result of
3384 * multiplying that number by 10^'scale'.
3385 * all without any floating-point arithmetic.
3387 int strict_strtoul_scaled(const char *cp
, unsigned long *res
, int scale
)
3389 unsigned long result
= 0;
3391 while (isdigit(*cp
) || (*cp
== '.' && decimals
< 0)) {
3394 else if (decimals
< scale
) {
3397 result
= result
* 10 + value
;
3409 while (decimals
< scale
) {
3418 static void md_safemode_timeout(unsigned long data
);
3421 safe_delay_show(struct mddev
*mddev
, char *page
)
3423 int msec
= (mddev
->safemode_delay
*1000)/HZ
;
3424 return sprintf(page
, "%d.%03d\n", msec
/1000, msec
%1000);
3427 safe_delay_store(struct mddev
*mddev
, const char *cbuf
, size_t len
)
3431 if (strict_strtoul_scaled(cbuf
, &msec
, 3) < 0)
3434 mddev
->safemode_delay
= 0;
3436 unsigned long old_delay
= mddev
->safemode_delay
;
3437 mddev
->safemode_delay
= (msec
*HZ
)/1000;
3438 if (mddev
->safemode_delay
== 0)
3439 mddev
->safemode_delay
= 1;
3440 if (mddev
->safemode_delay
< old_delay
|| old_delay
== 0)
3441 md_safemode_timeout((unsigned long)mddev
);
3445 static struct md_sysfs_entry md_safe_delay
=
3446 __ATTR(safe_mode_delay
, S_IRUGO
|S_IWUSR
,safe_delay_show
, safe_delay_store
);
3449 level_show(struct mddev
*mddev
, char *page
)
3451 struct md_personality
*p
= mddev
->pers
;
3453 return sprintf(page
, "%s\n", p
->name
);
3454 else if (mddev
->clevel
[0])
3455 return sprintf(page
, "%s\n", mddev
->clevel
);
3456 else if (mddev
->level
!= LEVEL_NONE
)
3457 return sprintf(page
, "%d\n", mddev
->level
);
3463 level_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3467 struct md_personality
*pers
;
3470 struct md_rdev
*rdev
;
3472 if (mddev
->pers
== NULL
) {
3475 if (len
>= sizeof(mddev
->clevel
))
3477 strncpy(mddev
->clevel
, buf
, len
);
3478 if (mddev
->clevel
[len
-1] == '\n')
3480 mddev
->clevel
[len
] = 0;
3481 mddev
->level
= LEVEL_NONE
;
3485 /* request to change the personality. Need to ensure:
3486 * - array is not engaged in resync/recovery/reshape
3487 * - old personality can be suspended
3488 * - new personality will access other array.
3491 if (mddev
->sync_thread
||
3492 mddev
->reshape_position
!= MaxSector
||
3493 mddev
->sysfs_active
)
3496 if (!mddev
->pers
->quiesce
) {
3497 printk(KERN_WARNING
"md: %s: %s does not support online personality change\n",
3498 mdname(mddev
), mddev
->pers
->name
);
3502 /* Now find the new personality */
3503 if (len
== 0 || len
>= sizeof(clevel
))
3505 strncpy(clevel
, buf
, len
);
3506 if (clevel
[len
-1] == '\n')
3509 if (kstrtol(clevel
, 10, &level
))
3512 if (request_module("md-%s", clevel
) != 0)
3513 request_module("md-level-%s", clevel
);
3514 spin_lock(&pers_lock
);
3515 pers
= find_pers(level
, clevel
);
3516 if (!pers
|| !try_module_get(pers
->owner
)) {
3517 spin_unlock(&pers_lock
);
3518 printk(KERN_WARNING
"md: personality %s not loaded\n", clevel
);
3521 spin_unlock(&pers_lock
);
3523 if (pers
== mddev
->pers
) {
3524 /* Nothing to do! */
3525 module_put(pers
->owner
);
3528 if (!pers
->takeover
) {
3529 module_put(pers
->owner
);
3530 printk(KERN_WARNING
"md: %s: %s does not support personality takeover\n",
3531 mdname(mddev
), clevel
);
3535 rdev_for_each(rdev
, mddev
)
3536 rdev
->new_raid_disk
= rdev
->raid_disk
;
3538 /* ->takeover must set new_* and/or delta_disks
3539 * if it succeeds, and may set them when it fails.
3541 priv
= pers
->takeover(mddev
);
3543 mddev
->new_level
= mddev
->level
;
3544 mddev
->new_layout
= mddev
->layout
;
3545 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3546 mddev
->raid_disks
-= mddev
->delta_disks
;
3547 mddev
->delta_disks
= 0;
3548 mddev
->reshape_backwards
= 0;
3549 module_put(pers
->owner
);
3550 printk(KERN_WARNING
"md: %s: %s would not accept array\n",
3551 mdname(mddev
), clevel
);
3552 return PTR_ERR(priv
);
3555 /* Looks like we have a winner */
3556 mddev_suspend(mddev
);
3557 mddev
->pers
->stop(mddev
);
3559 if (mddev
->pers
->sync_request
== NULL
&&
3560 pers
->sync_request
!= NULL
) {
3561 /* need to add the md_redundancy_group */
3562 if (sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
3564 "md: cannot register extra attributes for %s\n",
3566 mddev
->sysfs_action
= sysfs_get_dirent(mddev
->kobj
.sd
, "sync_action");
3568 if (mddev
->pers
->sync_request
!= NULL
&&
3569 pers
->sync_request
== NULL
) {
3570 /* need to remove the md_redundancy_group */
3571 if (mddev
->to_remove
== NULL
)
3572 mddev
->to_remove
= &md_redundancy_group
;
3575 if (mddev
->pers
->sync_request
== NULL
&&
3577 /* We are converting from a no-redundancy array
3578 * to a redundancy array and metadata is managed
3579 * externally so we need to be sure that writes
3580 * won't block due to a need to transition
3582 * until external management is started.
3585 mddev
->safemode_delay
= 0;
3586 mddev
->safemode
= 0;
3589 rdev_for_each(rdev
, mddev
) {
3590 if (rdev
->raid_disk
< 0)
3592 if (rdev
->new_raid_disk
>= mddev
->raid_disks
)
3593 rdev
->new_raid_disk
= -1;
3594 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3596 sysfs_unlink_rdev(mddev
, rdev
);
3598 rdev_for_each(rdev
, mddev
) {
3599 if (rdev
->raid_disk
< 0)
3601 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3603 rdev
->raid_disk
= rdev
->new_raid_disk
;
3604 if (rdev
->raid_disk
< 0)
3605 clear_bit(In_sync
, &rdev
->flags
);
3607 if (sysfs_link_rdev(mddev
, rdev
))
3608 printk(KERN_WARNING
"md: cannot register rd%d"
3609 " for %s after level change\n",
3610 rdev
->raid_disk
, mdname(mddev
));
3614 module_put(mddev
->pers
->owner
);
3616 mddev
->private = priv
;
3617 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
3618 mddev
->level
= mddev
->new_level
;
3619 mddev
->layout
= mddev
->new_layout
;
3620 mddev
->chunk_sectors
= mddev
->new_chunk_sectors
;
3621 mddev
->delta_disks
= 0;
3622 mddev
->reshape_backwards
= 0;
3623 mddev
->degraded
= 0;
3624 if (mddev
->pers
->sync_request
== NULL
) {
3625 /* this is now an array without redundancy, so
3626 * it must always be in_sync
3629 del_timer_sync(&mddev
->safemode_timer
);
3631 blk_set_stacking_limits(&mddev
->queue
->limits
);
3633 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
3634 mddev_resume(mddev
);
3635 sysfs_notify(&mddev
->kobj
, NULL
, "level");
3636 md_new_event(mddev
);
3640 static struct md_sysfs_entry md_level
=
3641 __ATTR(level
, S_IRUGO
|S_IWUSR
, level_show
, level_store
);
3645 layout_show(struct mddev
*mddev
, char *page
)
3647 /* just a number, not meaningful for all levels */
3648 if (mddev
->reshape_position
!= MaxSector
&&
3649 mddev
->layout
!= mddev
->new_layout
)
3650 return sprintf(page
, "%d (%d)\n",
3651 mddev
->new_layout
, mddev
->layout
);
3652 return sprintf(page
, "%d\n", mddev
->layout
);
3656 layout_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3659 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3661 if (!*buf
|| (*e
&& *e
!= '\n'))
3666 if (mddev
->pers
->check_reshape
== NULL
)
3668 mddev
->new_layout
= n
;
3669 err
= mddev
->pers
->check_reshape(mddev
);
3671 mddev
->new_layout
= mddev
->layout
;
3675 mddev
->new_layout
= n
;
3676 if (mddev
->reshape_position
== MaxSector
)
3681 static struct md_sysfs_entry md_layout
=
3682 __ATTR(layout
, S_IRUGO
|S_IWUSR
, layout_show
, layout_store
);
3686 raid_disks_show(struct mddev
*mddev
, char *page
)
3688 if (mddev
->raid_disks
== 0)
3690 if (mddev
->reshape_position
!= MaxSector
&&
3691 mddev
->delta_disks
!= 0)
3692 return sprintf(page
, "%d (%d)\n", mddev
->raid_disks
,
3693 mddev
->raid_disks
- mddev
->delta_disks
);
3694 return sprintf(page
, "%d\n", mddev
->raid_disks
);
3697 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
);
3700 raid_disks_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3704 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3706 if (!*buf
|| (*e
&& *e
!= '\n'))
3710 rv
= update_raid_disks(mddev
, n
);
3711 else if (mddev
->reshape_position
!= MaxSector
) {
3712 struct md_rdev
*rdev
;
3713 int olddisks
= mddev
->raid_disks
- mddev
->delta_disks
;
3715 rdev_for_each(rdev
, mddev
) {
3717 rdev
->data_offset
< rdev
->new_data_offset
)
3720 rdev
->data_offset
> rdev
->new_data_offset
)
3723 mddev
->delta_disks
= n
- olddisks
;
3724 mddev
->raid_disks
= n
;
3725 mddev
->reshape_backwards
= (mddev
->delta_disks
< 0);
3727 mddev
->raid_disks
= n
;
3728 return rv
? rv
: len
;
3730 static struct md_sysfs_entry md_raid_disks
=
3731 __ATTR(raid_disks
, S_IRUGO
|S_IWUSR
, raid_disks_show
, raid_disks_store
);
3734 chunk_size_show(struct mddev
*mddev
, char *page
)
3736 if (mddev
->reshape_position
!= MaxSector
&&
3737 mddev
->chunk_sectors
!= mddev
->new_chunk_sectors
)
3738 return sprintf(page
, "%d (%d)\n",
3739 mddev
->new_chunk_sectors
<< 9,
3740 mddev
->chunk_sectors
<< 9);
3741 return sprintf(page
, "%d\n", mddev
->chunk_sectors
<< 9);
3745 chunk_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3748 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3750 if (!*buf
|| (*e
&& *e
!= '\n'))
3755 if (mddev
->pers
->check_reshape
== NULL
)
3757 mddev
->new_chunk_sectors
= n
>> 9;
3758 err
= mddev
->pers
->check_reshape(mddev
);
3760 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3764 mddev
->new_chunk_sectors
= n
>> 9;
3765 if (mddev
->reshape_position
== MaxSector
)
3766 mddev
->chunk_sectors
= n
>> 9;
3770 static struct md_sysfs_entry md_chunk_size
=
3771 __ATTR(chunk_size
, S_IRUGO
|S_IWUSR
, chunk_size_show
, chunk_size_store
);
3774 resync_start_show(struct mddev
*mddev
, char *page
)
3776 if (mddev
->recovery_cp
== MaxSector
)
3777 return sprintf(page
, "none\n");
3778 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->recovery_cp
);
3782 resync_start_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3785 unsigned long long n
= simple_strtoull(buf
, &e
, 10);
3787 if (mddev
->pers
&& !test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
3789 if (cmd_match(buf
, "none"))
3791 else if (!*buf
|| (*e
&& *e
!= '\n'))
3794 mddev
->recovery_cp
= n
;
3796 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
3799 static struct md_sysfs_entry md_resync_start
=
3800 __ATTR(resync_start
, S_IRUGO
|S_IWUSR
, resync_start_show
, resync_start_store
);
3803 * The array state can be:
3806 * No devices, no size, no level
3807 * Equivalent to STOP_ARRAY ioctl
3809 * May have some settings, but array is not active
3810 * all IO results in error
3811 * When written, doesn't tear down array, but just stops it
3812 * suspended (not supported yet)
3813 * All IO requests will block. The array can be reconfigured.
3814 * Writing this, if accepted, will block until array is quiescent
3816 * no resync can happen. no superblocks get written.
3817 * write requests fail
3819 * like readonly, but behaves like 'clean' on a write request.
3821 * clean - no pending writes, but otherwise active.
3822 * When written to inactive array, starts without resync
3823 * If a write request arrives then
3824 * if metadata is known, mark 'dirty' and switch to 'active'.
3825 * if not known, block and switch to write-pending
3826 * If written to an active array that has pending writes, then fails.
3828 * fully active: IO and resync can be happening.
3829 * When written to inactive array, starts with resync
3832 * clean, but writes are blocked waiting for 'active' to be written.
3835 * like active, but no writes have been seen for a while (100msec).
3838 enum array_state
{ clear
, inactive
, suspended
, readonly
, read_auto
, clean
, active
,
3839 write_pending
, active_idle
, bad_word
};
3840 static char *array_states
[] = {
3841 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3842 "write-pending", "active-idle", NULL
};
3844 static int match_word(const char *word
, char **list
)
3847 for (n
=0; list
[n
]; n
++)
3848 if (cmd_match(word
, list
[n
]))
3854 array_state_show(struct mddev
*mddev
, char *page
)
3856 enum array_state st
= inactive
;
3869 else if (test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
3871 else if (mddev
->safemode
)
3877 if (list_empty(&mddev
->disks
) &&
3878 mddev
->raid_disks
== 0 &&
3879 mddev
->dev_sectors
== 0)
3884 return sprintf(page
, "%s\n", array_states
[st
]);
3887 static int do_md_stop(struct mddev
* mddev
, int ro
, struct block_device
*bdev
);
3888 static int md_set_readonly(struct mddev
* mddev
, struct block_device
*bdev
);
3889 static int do_md_run(struct mddev
* mddev
);
3890 static int restart_array(struct mddev
*mddev
);
3893 array_state_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3896 enum array_state st
= match_word(buf
, array_states
);
3901 /* stopping an active array */
3902 err
= do_md_stop(mddev
, 0, NULL
);
3905 /* stopping an active array */
3907 err
= do_md_stop(mddev
, 2, NULL
);
3909 err
= 0; /* already inactive */
3912 break; /* not supported yet */
3915 err
= md_set_readonly(mddev
, NULL
);
3918 set_disk_ro(mddev
->gendisk
, 1);
3919 err
= do_md_run(mddev
);
3925 err
= md_set_readonly(mddev
, NULL
);
3926 else if (mddev
->ro
== 1)
3927 err
= restart_array(mddev
);
3930 set_disk_ro(mddev
->gendisk
, 0);
3934 err
= do_md_run(mddev
);
3939 restart_array(mddev
);
3940 spin_lock_irq(&mddev
->write_lock
);
3941 if (atomic_read(&mddev
->writes_pending
) == 0) {
3942 if (mddev
->in_sync
== 0) {
3944 if (mddev
->safemode
== 1)
3945 mddev
->safemode
= 0;
3946 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
3951 spin_unlock_irq(&mddev
->write_lock
);
3957 restart_array(mddev
);
3958 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
3959 wake_up(&mddev
->sb_wait
);
3963 set_disk_ro(mddev
->gendisk
, 0);
3964 err
= do_md_run(mddev
);
3969 /* these cannot be set */
3975 if (mddev
->hold_active
== UNTIL_IOCTL
)
3976 mddev
->hold_active
= 0;
3977 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
3981 static struct md_sysfs_entry md_array_state
=
3982 __ATTR(array_state
, S_IRUGO
|S_IWUSR
, array_state_show
, array_state_store
);
3985 max_corrected_read_errors_show(struct mddev
*mddev
, char *page
) {
3986 return sprintf(page
, "%d\n",
3987 atomic_read(&mddev
->max_corr_read_errors
));
3991 max_corrected_read_errors_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3994 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3996 if (*buf
&& (*e
== 0 || *e
== '\n')) {
3997 atomic_set(&mddev
->max_corr_read_errors
, n
);
4003 static struct md_sysfs_entry max_corr_read_errors
=
4004 __ATTR(max_read_errors
, S_IRUGO
|S_IWUSR
, max_corrected_read_errors_show
,
4005 max_corrected_read_errors_store
);
4008 null_show(struct mddev
*mddev
, char *page
)
4014 new_dev_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4016 /* buf must be %d:%d\n? giving major and minor numbers */
4017 /* The new device is added to the array.
4018 * If the array has a persistent superblock, we read the
4019 * superblock to initialise info and check validity.
4020 * Otherwise, only checking done is that in bind_rdev_to_array,
4021 * which mainly checks size.
4024 int major
= simple_strtoul(buf
, &e
, 10);
4027 struct md_rdev
*rdev
;
4030 if (!*buf
|| *e
!= ':' || !e
[1] || e
[1] == '\n')
4032 minor
= simple_strtoul(e
+1, &e
, 10);
4033 if (*e
&& *e
!= '\n')
4035 dev
= MKDEV(major
, minor
);
4036 if (major
!= MAJOR(dev
) ||
4037 minor
!= MINOR(dev
))
4041 if (mddev
->persistent
) {
4042 rdev
= md_import_device(dev
, mddev
->major_version
,
4043 mddev
->minor_version
);
4044 if (!IS_ERR(rdev
) && !list_empty(&mddev
->disks
)) {
4045 struct md_rdev
*rdev0
4046 = list_entry(mddev
->disks
.next
,
4047 struct md_rdev
, same_set
);
4048 err
= super_types
[mddev
->major_version
]
4049 .load_super(rdev
, rdev0
, mddev
->minor_version
);
4053 } else if (mddev
->external
)
4054 rdev
= md_import_device(dev
, -2, -1);
4056 rdev
= md_import_device(dev
, -1, -1);
4059 return PTR_ERR(rdev
);
4060 err
= bind_rdev_to_array(rdev
, mddev
);
4064 return err
? err
: len
;
4067 static struct md_sysfs_entry md_new_device
=
4068 __ATTR(new_dev
, S_IWUSR
, null_show
, new_dev_store
);
4071 bitmap_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4074 unsigned long chunk
, end_chunk
;
4078 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
4080 chunk
= end_chunk
= simple_strtoul(buf
, &end
, 0);
4081 if (buf
== end
) break;
4082 if (*end
== '-') { /* range */
4084 end_chunk
= simple_strtoul(buf
, &end
, 0);
4085 if (buf
== end
) break;
4087 if (*end
&& !isspace(*end
)) break;
4088 bitmap_dirty_bits(mddev
->bitmap
, chunk
, end_chunk
);
4089 buf
= skip_spaces(end
);
4091 bitmap_unplug(mddev
->bitmap
); /* flush the bits to disk */
4096 static struct md_sysfs_entry md_bitmap
=
4097 __ATTR(bitmap_set_bits
, S_IWUSR
, null_show
, bitmap_store
);
4100 size_show(struct mddev
*mddev
, char *page
)
4102 return sprintf(page
, "%llu\n",
4103 (unsigned long long)mddev
->dev_sectors
/ 2);
4106 static int update_size(struct mddev
*mddev
, sector_t num_sectors
);
4109 size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4111 /* If array is inactive, we can reduce the component size, but
4112 * not increase it (except from 0).
4113 * If array is active, we can try an on-line resize
4116 int err
= strict_blocks_to_sectors(buf
, §ors
);
4121 err
= update_size(mddev
, sectors
);
4122 md_update_sb(mddev
, 1);
4124 if (mddev
->dev_sectors
== 0 ||
4125 mddev
->dev_sectors
> sectors
)
4126 mddev
->dev_sectors
= sectors
;
4130 return err
? err
: len
;
4133 static struct md_sysfs_entry md_size
=
4134 __ATTR(component_size
, S_IRUGO
|S_IWUSR
, size_show
, size_store
);
4137 /* Metadata version.
4139 * 'none' for arrays with no metadata (good luck...)
4140 * 'external' for arrays with externally managed metadata,
4141 * or N.M for internally known formats
4144 metadata_show(struct mddev
*mddev
, char *page
)
4146 if (mddev
->persistent
)
4147 return sprintf(page
, "%d.%d\n",
4148 mddev
->major_version
, mddev
->minor_version
);
4149 else if (mddev
->external
)
4150 return sprintf(page
, "external:%s\n", mddev
->metadata_type
);
4152 return sprintf(page
, "none\n");
4156 metadata_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4160 /* Changing the details of 'external' metadata is
4161 * always permitted. Otherwise there must be
4162 * no devices attached to the array.
4164 if (mddev
->external
&& strncmp(buf
, "external:", 9) == 0)
4166 else if (!list_empty(&mddev
->disks
))
4169 if (cmd_match(buf
, "none")) {
4170 mddev
->persistent
= 0;
4171 mddev
->external
= 0;
4172 mddev
->major_version
= 0;
4173 mddev
->minor_version
= 90;
4176 if (strncmp(buf
, "external:", 9) == 0) {
4177 size_t namelen
= len
-9;
4178 if (namelen
>= sizeof(mddev
->metadata_type
))
4179 namelen
= sizeof(mddev
->metadata_type
)-1;
4180 strncpy(mddev
->metadata_type
, buf
+9, namelen
);
4181 mddev
->metadata_type
[namelen
] = 0;
4182 if (namelen
&& mddev
->metadata_type
[namelen
-1] == '\n')
4183 mddev
->metadata_type
[--namelen
] = 0;
4184 mddev
->persistent
= 0;
4185 mddev
->external
= 1;
4186 mddev
->major_version
= 0;
4187 mddev
->minor_version
= 90;
4190 major
= simple_strtoul(buf
, &e
, 10);
4191 if (e
==buf
|| *e
!= '.')
4194 minor
= simple_strtoul(buf
, &e
, 10);
4195 if (e
==buf
|| (*e
&& *e
!= '\n') )
4197 if (major
>= ARRAY_SIZE(super_types
) || super_types
[major
].name
== NULL
)
4199 mddev
->major_version
= major
;
4200 mddev
->minor_version
= minor
;
4201 mddev
->persistent
= 1;
4202 mddev
->external
= 0;
4206 static struct md_sysfs_entry md_metadata
=
4207 __ATTR(metadata_version
, S_IRUGO
|S_IWUSR
, metadata_show
, metadata_store
);
4210 action_show(struct mddev
*mddev
, char *page
)
4212 char *type
= "idle";
4213 if (test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
4215 else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
4216 (!mddev
->ro
&& test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))) {
4217 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
4219 else if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
4220 if (!test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
4222 else if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
4226 } else if (test_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
))
4229 return sprintf(page
, "%s\n", type
);
4233 action_store(struct mddev
*mddev
, const char *page
, size_t len
)
4235 if (!mddev
->pers
|| !mddev
->pers
->sync_request
)
4238 if (cmd_match(page
, "frozen"))
4239 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4241 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4243 if (cmd_match(page
, "idle") || cmd_match(page
, "frozen")) {
4244 if (mddev
->sync_thread
) {
4245 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4246 md_reap_sync_thread(mddev
);
4248 } else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
4249 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
4251 else if (cmd_match(page
, "resync"))
4252 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4253 else if (cmd_match(page
, "recover")) {
4254 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
4255 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4256 } else if (cmd_match(page
, "reshape")) {
4258 if (mddev
->pers
->start_reshape
== NULL
)
4260 err
= mddev
->pers
->start_reshape(mddev
);
4263 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
4265 if (cmd_match(page
, "check"))
4266 set_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
4267 else if (!cmd_match(page
, "repair"))
4269 set_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
4270 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
4272 if (mddev
->ro
== 2) {
4273 /* A write to sync_action is enough to justify
4274 * canceling read-auto mode
4277 md_wakeup_thread(mddev
->sync_thread
);
4279 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4280 md_wakeup_thread(mddev
->thread
);
4281 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
4285 static struct md_sysfs_entry md_scan_mode
=
4286 __ATTR(sync_action
, S_IRUGO
|S_IWUSR
, action_show
, action_store
);
4289 last_sync_action_show(struct mddev
*mddev
, char *page
)
4291 return sprintf(page
, "%s\n", mddev
->last_sync_action
);
4294 static struct md_sysfs_entry md_last_scan_mode
= __ATTR_RO(last_sync_action
);
4297 mismatch_cnt_show(struct mddev
*mddev
, char *page
)
4299 return sprintf(page
, "%llu\n",
4300 (unsigned long long)
4301 atomic64_read(&mddev
->resync_mismatches
));
4304 static struct md_sysfs_entry md_mismatches
= __ATTR_RO(mismatch_cnt
);
4307 sync_min_show(struct mddev
*mddev
, char *page
)
4309 return sprintf(page
, "%d (%s)\n", speed_min(mddev
),
4310 mddev
->sync_speed_min
? "local": "system");
4314 sync_min_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4318 if (strncmp(buf
, "system", 6)==0) {
4319 mddev
->sync_speed_min
= 0;
4322 min
= simple_strtoul(buf
, &e
, 10);
4323 if (buf
== e
|| (*e
&& *e
!= '\n') || min
<= 0)
4325 mddev
->sync_speed_min
= min
;
4329 static struct md_sysfs_entry md_sync_min
=
4330 __ATTR(sync_speed_min
, S_IRUGO
|S_IWUSR
, sync_min_show
, sync_min_store
);
4333 sync_max_show(struct mddev
*mddev
, char *page
)
4335 return sprintf(page
, "%d (%s)\n", speed_max(mddev
),
4336 mddev
->sync_speed_max
? "local": "system");
4340 sync_max_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4344 if (strncmp(buf
, "system", 6)==0) {
4345 mddev
->sync_speed_max
= 0;
4348 max
= simple_strtoul(buf
, &e
, 10);
4349 if (buf
== e
|| (*e
&& *e
!= '\n') || max
<= 0)
4351 mddev
->sync_speed_max
= max
;
4355 static struct md_sysfs_entry md_sync_max
=
4356 __ATTR(sync_speed_max
, S_IRUGO
|S_IWUSR
, sync_max_show
, sync_max_store
);
4359 degraded_show(struct mddev
*mddev
, char *page
)
4361 return sprintf(page
, "%d\n", mddev
->degraded
);
4363 static struct md_sysfs_entry md_degraded
= __ATTR_RO(degraded
);
4366 sync_force_parallel_show(struct mddev
*mddev
, char *page
)
4368 return sprintf(page
, "%d\n", mddev
->parallel_resync
);
4372 sync_force_parallel_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4376 if (kstrtol(buf
, 10, &n
))
4379 if (n
!= 0 && n
!= 1)
4382 mddev
->parallel_resync
= n
;
4384 if (mddev
->sync_thread
)
4385 wake_up(&resync_wait
);
4390 /* force parallel resync, even with shared block devices */
4391 static struct md_sysfs_entry md_sync_force_parallel
=
4392 __ATTR(sync_force_parallel
, S_IRUGO
|S_IWUSR
,
4393 sync_force_parallel_show
, sync_force_parallel_store
);
4396 sync_speed_show(struct mddev
*mddev
, char *page
)
4398 unsigned long resync
, dt
, db
;
4399 if (mddev
->curr_resync
== 0)
4400 return sprintf(page
, "none\n");
4401 resync
= mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
);
4402 dt
= (jiffies
- mddev
->resync_mark
) / HZ
;
4404 db
= resync
- mddev
->resync_mark_cnt
;
4405 return sprintf(page
, "%lu\n", db
/dt
/2); /* K/sec */
4408 static struct md_sysfs_entry md_sync_speed
= __ATTR_RO(sync_speed
);
4411 sync_completed_show(struct mddev
*mddev
, char *page
)
4413 unsigned long long max_sectors
, resync
;
4415 if (!test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4416 return sprintf(page
, "none\n");
4418 if (mddev
->curr_resync
== 1 ||
4419 mddev
->curr_resync
== 2)
4420 return sprintf(page
, "delayed\n");
4422 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
4423 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
4424 max_sectors
= mddev
->resync_max_sectors
;
4426 max_sectors
= mddev
->dev_sectors
;
4428 resync
= mddev
->curr_resync_completed
;
4429 return sprintf(page
, "%llu / %llu\n", resync
, max_sectors
);
4432 static struct md_sysfs_entry md_sync_completed
= __ATTR_RO(sync_completed
);
4435 min_sync_show(struct mddev
*mddev
, char *page
)
4437 return sprintf(page
, "%llu\n",
4438 (unsigned long long)mddev
->resync_min
);
4441 min_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4443 unsigned long long min
;
4444 if (kstrtoull(buf
, 10, &min
))
4446 if (min
> mddev
->resync_max
)
4448 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4451 /* Must be a multiple of chunk_size */
4452 if (mddev
->chunk_sectors
) {
4453 sector_t temp
= min
;
4454 if (sector_div(temp
, mddev
->chunk_sectors
))
4457 mddev
->resync_min
= min
;
4462 static struct md_sysfs_entry md_min_sync
=
4463 __ATTR(sync_min
, S_IRUGO
|S_IWUSR
, min_sync_show
, min_sync_store
);
4466 max_sync_show(struct mddev
*mddev
, char *page
)
4468 if (mddev
->resync_max
== MaxSector
)
4469 return sprintf(page
, "max\n");
4471 return sprintf(page
, "%llu\n",
4472 (unsigned long long)mddev
->resync_max
);
4475 max_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4477 if (strncmp(buf
, "max", 3) == 0)
4478 mddev
->resync_max
= MaxSector
;
4480 unsigned long long max
;
4481 if (kstrtoull(buf
, 10, &max
))
4483 if (max
< mddev
->resync_min
)
4485 if (max
< mddev
->resync_max
&&
4487 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4490 /* Must be a multiple of chunk_size */
4491 if (mddev
->chunk_sectors
) {
4492 sector_t temp
= max
;
4493 if (sector_div(temp
, mddev
->chunk_sectors
))
4496 mddev
->resync_max
= max
;
4498 wake_up(&mddev
->recovery_wait
);
4502 static struct md_sysfs_entry md_max_sync
=
4503 __ATTR(sync_max
, S_IRUGO
|S_IWUSR
, max_sync_show
, max_sync_store
);
4506 suspend_lo_show(struct mddev
*mddev
, char *page
)
4508 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_lo
);
4512 suspend_lo_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4515 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4516 unsigned long long old
= mddev
->suspend_lo
;
4518 if (mddev
->pers
== NULL
||
4519 mddev
->pers
->quiesce
== NULL
)
4521 if (buf
== e
|| (*e
&& *e
!= '\n'))
4524 mddev
->suspend_lo
= new;
4526 /* Shrinking suspended region */
4527 mddev
->pers
->quiesce(mddev
, 2);
4529 /* Expanding suspended region - need to wait */
4530 mddev
->pers
->quiesce(mddev
, 1);
4531 mddev
->pers
->quiesce(mddev
, 0);
4535 static struct md_sysfs_entry md_suspend_lo
=
4536 __ATTR(suspend_lo
, S_IRUGO
|S_IWUSR
, suspend_lo_show
, suspend_lo_store
);
4540 suspend_hi_show(struct mddev
*mddev
, char *page
)
4542 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_hi
);
4546 suspend_hi_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4549 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4550 unsigned long long old
= mddev
->suspend_hi
;
4552 if (mddev
->pers
== NULL
||
4553 mddev
->pers
->quiesce
== NULL
)
4555 if (buf
== e
|| (*e
&& *e
!= '\n'))
4558 mddev
->suspend_hi
= new;
4560 /* Shrinking suspended region */
4561 mddev
->pers
->quiesce(mddev
, 2);
4563 /* Expanding suspended region - need to wait */
4564 mddev
->pers
->quiesce(mddev
, 1);
4565 mddev
->pers
->quiesce(mddev
, 0);
4569 static struct md_sysfs_entry md_suspend_hi
=
4570 __ATTR(suspend_hi
, S_IRUGO
|S_IWUSR
, suspend_hi_show
, suspend_hi_store
);
4573 reshape_position_show(struct mddev
*mddev
, char *page
)
4575 if (mddev
->reshape_position
!= MaxSector
)
4576 return sprintf(page
, "%llu\n",
4577 (unsigned long long)mddev
->reshape_position
);
4578 strcpy(page
, "none\n");
4583 reshape_position_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4585 struct md_rdev
*rdev
;
4587 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4590 if (buf
== e
|| (*e
&& *e
!= '\n'))
4592 mddev
->reshape_position
= new;
4593 mddev
->delta_disks
= 0;
4594 mddev
->reshape_backwards
= 0;
4595 mddev
->new_level
= mddev
->level
;
4596 mddev
->new_layout
= mddev
->layout
;
4597 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
4598 rdev_for_each(rdev
, mddev
)
4599 rdev
->new_data_offset
= rdev
->data_offset
;
4603 static struct md_sysfs_entry md_reshape_position
=
4604 __ATTR(reshape_position
, S_IRUGO
|S_IWUSR
, reshape_position_show
,
4605 reshape_position_store
);
4608 reshape_direction_show(struct mddev
*mddev
, char *page
)
4610 return sprintf(page
, "%s\n",
4611 mddev
->reshape_backwards
? "backwards" : "forwards");
4615 reshape_direction_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4618 if (cmd_match(buf
, "forwards"))
4620 else if (cmd_match(buf
, "backwards"))
4624 if (mddev
->reshape_backwards
== backwards
)
4627 /* check if we are allowed to change */
4628 if (mddev
->delta_disks
)
4631 if (mddev
->persistent
&&
4632 mddev
->major_version
== 0)
4635 mddev
->reshape_backwards
= backwards
;
4639 static struct md_sysfs_entry md_reshape_direction
=
4640 __ATTR(reshape_direction
, S_IRUGO
|S_IWUSR
, reshape_direction_show
,
4641 reshape_direction_store
);
4644 array_size_show(struct mddev
*mddev
, char *page
)
4646 if (mddev
->external_size
)
4647 return sprintf(page
, "%llu\n",
4648 (unsigned long long)mddev
->array_sectors
/2);
4650 return sprintf(page
, "default\n");
4654 array_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4658 if (strncmp(buf
, "default", 7) == 0) {
4660 sectors
= mddev
->pers
->size(mddev
, 0, 0);
4662 sectors
= mddev
->array_sectors
;
4664 mddev
->external_size
= 0;
4666 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
4668 if (mddev
->pers
&& mddev
->pers
->size(mddev
, 0, 0) < sectors
)
4671 mddev
->external_size
= 1;
4674 mddev
->array_sectors
= sectors
;
4676 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
4677 revalidate_disk(mddev
->gendisk
);
4682 static struct md_sysfs_entry md_array_size
=
4683 __ATTR(array_size
, S_IRUGO
|S_IWUSR
, array_size_show
,
4686 static struct attribute
*md_default_attrs
[] = {
4689 &md_raid_disks
.attr
,
4690 &md_chunk_size
.attr
,
4692 &md_resync_start
.attr
,
4694 &md_new_device
.attr
,
4695 &md_safe_delay
.attr
,
4696 &md_array_state
.attr
,
4697 &md_reshape_position
.attr
,
4698 &md_reshape_direction
.attr
,
4699 &md_array_size
.attr
,
4700 &max_corr_read_errors
.attr
,
4704 static struct attribute
*md_redundancy_attrs
[] = {
4706 &md_last_scan_mode
.attr
,
4707 &md_mismatches
.attr
,
4710 &md_sync_speed
.attr
,
4711 &md_sync_force_parallel
.attr
,
4712 &md_sync_completed
.attr
,
4715 &md_suspend_lo
.attr
,
4716 &md_suspend_hi
.attr
,
4721 static struct attribute_group md_redundancy_group
= {
4723 .attrs
= md_redundancy_attrs
,
4728 md_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
4730 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4731 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
4736 spin_lock(&all_mddevs_lock
);
4737 if (list_empty(&mddev
->all_mddevs
)) {
4738 spin_unlock(&all_mddevs_lock
);
4742 spin_unlock(&all_mddevs_lock
);
4744 rv
= mddev_lock(mddev
);
4746 rv
= entry
->show(mddev
, page
);
4747 mddev_unlock(mddev
);
4754 md_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
4755 const char *page
, size_t length
)
4757 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4758 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
4763 if (!capable(CAP_SYS_ADMIN
))
4765 spin_lock(&all_mddevs_lock
);
4766 if (list_empty(&mddev
->all_mddevs
)) {
4767 spin_unlock(&all_mddevs_lock
);
4771 spin_unlock(&all_mddevs_lock
);
4772 if (entry
->store
== new_dev_store
)
4773 flush_workqueue(md_misc_wq
);
4774 rv
= mddev_lock(mddev
);
4776 rv
= entry
->store(mddev
, page
, length
);
4777 mddev_unlock(mddev
);
4783 static void md_free(struct kobject
*ko
)
4785 struct mddev
*mddev
= container_of(ko
, struct mddev
, kobj
);
4787 if (mddev
->sysfs_state
)
4788 sysfs_put(mddev
->sysfs_state
);
4790 if (mddev
->gendisk
) {
4791 del_gendisk(mddev
->gendisk
);
4792 put_disk(mddev
->gendisk
);
4795 blk_cleanup_queue(mddev
->queue
);
4800 static const struct sysfs_ops md_sysfs_ops
= {
4801 .show
= md_attr_show
,
4802 .store
= md_attr_store
,
4804 static struct kobj_type md_ktype
= {
4806 .sysfs_ops
= &md_sysfs_ops
,
4807 .default_attrs
= md_default_attrs
,
4812 static void mddev_delayed_delete(struct work_struct
*ws
)
4814 struct mddev
*mddev
= container_of(ws
, struct mddev
, del_work
);
4816 sysfs_remove_group(&mddev
->kobj
, &md_bitmap_group
);
4817 kobject_del(&mddev
->kobj
);
4818 kobject_put(&mddev
->kobj
);
4821 static int md_alloc(dev_t dev
, char *name
)
4823 static DEFINE_MUTEX(disks_mutex
);
4824 struct mddev
*mddev
= mddev_find(dev
);
4825 struct gendisk
*disk
;
4834 partitioned
= (MAJOR(mddev
->unit
) != MD_MAJOR
);
4835 shift
= partitioned
? MdpMinorShift
: 0;
4836 unit
= MINOR(mddev
->unit
) >> shift
;
4838 /* wait for any previous instance of this device to be
4839 * completely removed (mddev_delayed_delete).
4841 flush_workqueue(md_misc_wq
);
4843 mutex_lock(&disks_mutex
);
4849 /* Need to ensure that 'name' is not a duplicate.
4851 struct mddev
*mddev2
;
4852 spin_lock(&all_mddevs_lock
);
4854 list_for_each_entry(mddev2
, &all_mddevs
, all_mddevs
)
4855 if (mddev2
->gendisk
&&
4856 strcmp(mddev2
->gendisk
->disk_name
, name
) == 0) {
4857 spin_unlock(&all_mddevs_lock
);
4860 spin_unlock(&all_mddevs_lock
);
4864 mddev
->queue
= blk_alloc_queue(GFP_KERNEL
);
4867 mddev
->queue
->queuedata
= mddev
;
4869 blk_queue_make_request(mddev
->queue
, md_make_request
);
4870 blk_set_stacking_limits(&mddev
->queue
->limits
);
4872 disk
= alloc_disk(1 << shift
);
4874 blk_cleanup_queue(mddev
->queue
);
4875 mddev
->queue
= NULL
;
4878 disk
->major
= MAJOR(mddev
->unit
);
4879 disk
->first_minor
= unit
<< shift
;
4881 strcpy(disk
->disk_name
, name
);
4882 else if (partitioned
)
4883 sprintf(disk
->disk_name
, "md_d%d", unit
);
4885 sprintf(disk
->disk_name
, "md%d", unit
);
4886 disk
->fops
= &md_fops
;
4887 disk
->private_data
= mddev
;
4888 disk
->queue
= mddev
->queue
;
4889 blk_queue_flush(mddev
->queue
, REQ_FLUSH
| REQ_FUA
);
4890 /* Allow extended partitions. This makes the
4891 * 'mdp' device redundant, but we can't really
4894 disk
->flags
|= GENHD_FL_EXT_DEVT
;
4895 mddev
->gendisk
= disk
;
4896 /* As soon as we call add_disk(), another thread could get
4897 * through to md_open, so make sure it doesn't get too far
4899 mutex_lock(&mddev
->open_mutex
);
4902 error
= kobject_init_and_add(&mddev
->kobj
, &md_ktype
,
4903 &disk_to_dev(disk
)->kobj
, "%s", "md");
4905 /* This isn't possible, but as kobject_init_and_add is marked
4906 * __must_check, we must do something with the result
4908 printk(KERN_WARNING
"md: cannot register %s/md - name in use\n",
4912 if (mddev
->kobj
.sd
&&
4913 sysfs_create_group(&mddev
->kobj
, &md_bitmap_group
))
4914 printk(KERN_DEBUG
"pointless warning\n");
4915 mutex_unlock(&mddev
->open_mutex
);
4917 mutex_unlock(&disks_mutex
);
4918 if (!error
&& mddev
->kobj
.sd
) {
4919 kobject_uevent(&mddev
->kobj
, KOBJ_ADD
);
4920 mddev
->sysfs_state
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "array_state");
4926 static struct kobject
*md_probe(dev_t dev
, int *part
, void *data
)
4928 md_alloc(dev
, NULL
);
4932 static int add_named_array(const char *val
, struct kernel_param
*kp
)
4934 /* val must be "md_*" where * is not all digits.
4935 * We allocate an array with a large free minor number, and
4936 * set the name to val. val must not already be an active name.
4938 int len
= strlen(val
);
4939 char buf
[DISK_NAME_LEN
];
4941 while (len
&& val
[len
-1] == '\n')
4943 if (len
>= DISK_NAME_LEN
)
4945 strlcpy(buf
, val
, len
+1);
4946 if (strncmp(buf
, "md_", 3) != 0)
4948 return md_alloc(0, buf
);
4951 static void md_safemode_timeout(unsigned long data
)
4953 struct mddev
*mddev
= (struct mddev
*) data
;
4955 if (!atomic_read(&mddev
->writes_pending
)) {
4956 mddev
->safemode
= 1;
4957 if (mddev
->external
)
4958 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4960 md_wakeup_thread(mddev
->thread
);
4963 static int start_dirty_degraded
;
4965 int md_run(struct mddev
*mddev
)
4968 struct md_rdev
*rdev
;
4969 struct md_personality
*pers
;
4971 if (list_empty(&mddev
->disks
))
4972 /* cannot run an array with no devices.. */
4977 /* Cannot run until previous stop completes properly */
4978 if (mddev
->sysfs_active
)
4982 * Analyze all RAID superblock(s)
4984 if (!mddev
->raid_disks
) {
4985 if (!mddev
->persistent
)
4990 if (mddev
->level
!= LEVEL_NONE
)
4991 request_module("md-level-%d", mddev
->level
);
4992 else if (mddev
->clevel
[0])
4993 request_module("md-%s", mddev
->clevel
);
4996 * Drop all container device buffers, from now on
4997 * the only valid external interface is through the md
5000 rdev_for_each(rdev
, mddev
) {
5001 if (test_bit(Faulty
, &rdev
->flags
))
5003 sync_blockdev(rdev
->bdev
);
5004 invalidate_bdev(rdev
->bdev
);
5006 /* perform some consistency tests on the device.
5007 * We don't want the data to overlap the metadata,
5008 * Internal Bitmap issues have been handled elsewhere.
5010 if (rdev
->meta_bdev
) {
5011 /* Nothing to check */;
5012 } else if (rdev
->data_offset
< rdev
->sb_start
) {
5013 if (mddev
->dev_sectors
&&
5014 rdev
->data_offset
+ mddev
->dev_sectors
5016 printk("md: %s: data overlaps metadata\n",
5021 if (rdev
->sb_start
+ rdev
->sb_size
/512
5022 > rdev
->data_offset
) {
5023 printk("md: %s: metadata overlaps data\n",
5028 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
5031 if (mddev
->bio_set
== NULL
)
5032 mddev
->bio_set
= bioset_create(BIO_POOL_SIZE
, 0);
5034 spin_lock(&pers_lock
);
5035 pers
= find_pers(mddev
->level
, mddev
->clevel
);
5036 if (!pers
|| !try_module_get(pers
->owner
)) {
5037 spin_unlock(&pers_lock
);
5038 if (mddev
->level
!= LEVEL_NONE
)
5039 printk(KERN_WARNING
"md: personality for level %d is not loaded!\n",
5042 printk(KERN_WARNING
"md: personality for level %s is not loaded!\n",
5047 spin_unlock(&pers_lock
);
5048 if (mddev
->level
!= pers
->level
) {
5049 mddev
->level
= pers
->level
;
5050 mddev
->new_level
= pers
->level
;
5052 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
5054 if (mddev
->reshape_position
!= MaxSector
&&
5055 pers
->start_reshape
== NULL
) {
5056 /* This personality cannot handle reshaping... */
5058 module_put(pers
->owner
);
5062 if (pers
->sync_request
) {
5063 /* Warn if this is a potentially silly
5066 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
5067 struct md_rdev
*rdev2
;
5070 rdev_for_each(rdev
, mddev
)
5071 rdev_for_each(rdev2
, mddev
) {
5073 rdev
->bdev
->bd_contains
==
5074 rdev2
->bdev
->bd_contains
) {
5076 "%s: WARNING: %s appears to be"
5077 " on the same physical disk as"
5080 bdevname(rdev
->bdev
,b
),
5081 bdevname(rdev2
->bdev
,b2
));
5088 "True protection against single-disk"
5089 " failure might be compromised.\n");
5092 mddev
->recovery
= 0;
5093 /* may be over-ridden by personality */
5094 mddev
->resync_max_sectors
= mddev
->dev_sectors
;
5096 mddev
->ok_start_degraded
= start_dirty_degraded
;
5098 if (start_readonly
&& mddev
->ro
== 0)
5099 mddev
->ro
= 2; /* read-only, but switch on first write */
5101 err
= mddev
->pers
->run(mddev
);
5103 printk(KERN_ERR
"md: pers->run() failed ...\n");
5104 else if (mddev
->pers
->size(mddev
, 0, 0) < mddev
->array_sectors
) {
5105 WARN_ONCE(!mddev
->external_size
, "%s: default size too small,"
5106 " but 'external_size' not in effect?\n", __func__
);
5108 "md: invalid array_size %llu > default size %llu\n",
5109 (unsigned long long)mddev
->array_sectors
/ 2,
5110 (unsigned long long)mddev
->pers
->size(mddev
, 0, 0) / 2);
5112 mddev
->pers
->stop(mddev
);
5114 if (err
== 0 && mddev
->pers
->sync_request
&&
5115 (mddev
->bitmap_info
.file
|| mddev
->bitmap_info
.offset
)) {
5116 err
= bitmap_create(mddev
);
5118 printk(KERN_ERR
"%s: failed to create bitmap (%d)\n",
5119 mdname(mddev
), err
);
5120 mddev
->pers
->stop(mddev
);
5124 module_put(mddev
->pers
->owner
);
5126 bitmap_destroy(mddev
);
5129 if (mddev
->pers
->sync_request
) {
5130 if (mddev
->kobj
.sd
&&
5131 sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
5133 "md: cannot register extra attributes for %s\n",
5135 mddev
->sysfs_action
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "sync_action");
5136 } else if (mddev
->ro
== 2) /* auto-readonly not meaningful */
5139 atomic_set(&mddev
->writes_pending
,0);
5140 atomic_set(&mddev
->max_corr_read_errors
,
5141 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS
);
5142 mddev
->safemode
= 0;
5143 mddev
->safemode_timer
.function
= md_safemode_timeout
;
5144 mddev
->safemode_timer
.data
= (unsigned long) mddev
;
5145 mddev
->safemode_delay
= (200 * HZ
)/1000 +1; /* 200 msec delay */
5149 rdev_for_each(rdev
, mddev
)
5150 if (rdev
->raid_disk
>= 0)
5151 if (sysfs_link_rdev(mddev
, rdev
))
5152 /* failure here is OK */;
5154 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5156 if (mddev
->flags
& MD_UPDATE_SB_FLAGS
)
5157 md_update_sb(mddev
, 0);
5159 md_new_event(mddev
);
5160 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5161 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
5162 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
5165 EXPORT_SYMBOL_GPL(md_run
);
5167 static int do_md_run(struct mddev
*mddev
)
5171 err
= md_run(mddev
);
5174 err
= bitmap_load(mddev
);
5176 bitmap_destroy(mddev
);
5180 md_wakeup_thread(mddev
->thread
);
5181 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
5183 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
5184 revalidate_disk(mddev
->gendisk
);
5186 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
5191 static int restart_array(struct mddev
*mddev
)
5193 struct gendisk
*disk
= mddev
->gendisk
;
5195 /* Complain if it has no devices */
5196 if (list_empty(&mddev
->disks
))
5202 mddev
->safemode
= 0;
5204 set_disk_ro(disk
, 0);
5205 printk(KERN_INFO
"md: %s switched to read-write mode.\n",
5207 /* Kick recovery or resync if necessary */
5208 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5209 md_wakeup_thread(mddev
->thread
);
5210 md_wakeup_thread(mddev
->sync_thread
);
5211 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5215 /* similar to deny_write_access, but accounts for our holding a reference
5216 * to the file ourselves */
5217 static int deny_bitmap_write_access(struct file
* file
)
5219 struct inode
*inode
= file
->f_mapping
->host
;
5221 spin_lock(&inode
->i_lock
);
5222 if (atomic_read(&inode
->i_writecount
) > 1) {
5223 spin_unlock(&inode
->i_lock
);
5226 atomic_set(&inode
->i_writecount
, -1);
5227 spin_unlock(&inode
->i_lock
);
5232 void restore_bitmap_write_access(struct file
*file
)
5234 struct inode
*inode
= file
->f_mapping
->host
;
5236 spin_lock(&inode
->i_lock
);
5237 atomic_set(&inode
->i_writecount
, 1);
5238 spin_unlock(&inode
->i_lock
);
5241 static void md_clean(struct mddev
*mddev
)
5243 mddev
->array_sectors
= 0;
5244 mddev
->external_size
= 0;
5245 mddev
->dev_sectors
= 0;
5246 mddev
->raid_disks
= 0;
5247 mddev
->recovery_cp
= 0;
5248 mddev
->resync_min
= 0;
5249 mddev
->resync_max
= MaxSector
;
5250 mddev
->reshape_position
= MaxSector
;
5251 mddev
->external
= 0;
5252 mddev
->persistent
= 0;
5253 mddev
->level
= LEVEL_NONE
;
5254 mddev
->clevel
[0] = 0;
5257 mddev
->metadata_type
[0] = 0;
5258 mddev
->chunk_sectors
= 0;
5259 mddev
->ctime
= mddev
->utime
= 0;
5261 mddev
->max_disks
= 0;
5263 mddev
->can_decrease_events
= 0;
5264 mddev
->delta_disks
= 0;
5265 mddev
->reshape_backwards
= 0;
5266 mddev
->new_level
= LEVEL_NONE
;
5267 mddev
->new_layout
= 0;
5268 mddev
->new_chunk_sectors
= 0;
5269 mddev
->curr_resync
= 0;
5270 atomic64_set(&mddev
->resync_mismatches
, 0);
5271 mddev
->suspend_lo
= mddev
->suspend_hi
= 0;
5272 mddev
->sync_speed_min
= mddev
->sync_speed_max
= 0;
5273 mddev
->recovery
= 0;
5276 mddev
->degraded
= 0;
5277 mddev
->safemode
= 0;
5278 mddev
->merge_check_needed
= 0;
5279 mddev
->bitmap_info
.offset
= 0;
5280 mddev
->bitmap_info
.default_offset
= 0;
5281 mddev
->bitmap_info
.default_space
= 0;
5282 mddev
->bitmap_info
.chunksize
= 0;
5283 mddev
->bitmap_info
.daemon_sleep
= 0;
5284 mddev
->bitmap_info
.max_write_behind
= 0;
5287 static void __md_stop_writes(struct mddev
*mddev
)
5289 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5290 if (mddev
->sync_thread
) {
5291 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5292 md_reap_sync_thread(mddev
);
5295 del_timer_sync(&mddev
->safemode_timer
);
5297 bitmap_flush(mddev
);
5298 md_super_wait(mddev
);
5300 if (mddev
->ro
== 0 &&
5301 (!mddev
->in_sync
|| (mddev
->flags
& MD_UPDATE_SB_FLAGS
))) {
5302 /* mark array as shutdown cleanly */
5304 md_update_sb(mddev
, 1);
5308 void md_stop_writes(struct mddev
*mddev
)
5310 mddev_lock_nointr(mddev
);
5311 __md_stop_writes(mddev
);
5312 mddev_unlock(mddev
);
5314 EXPORT_SYMBOL_GPL(md_stop_writes
);
5316 static void __md_stop(struct mddev
*mddev
)
5319 mddev
->pers
->stop(mddev
);
5320 if (mddev
->pers
->sync_request
&& mddev
->to_remove
== NULL
)
5321 mddev
->to_remove
= &md_redundancy_group
;
5322 module_put(mddev
->pers
->owner
);
5324 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5327 void md_stop(struct mddev
*mddev
)
5329 /* stop the array and free an attached data structures.
5330 * This is called from dm-raid
5333 bitmap_destroy(mddev
);
5335 bioset_free(mddev
->bio_set
);
5338 EXPORT_SYMBOL_GPL(md_stop
);
5340 static int md_set_readonly(struct mddev
*mddev
, struct block_device
*bdev
)
5343 mutex_lock(&mddev
->open_mutex
);
5344 if (atomic_read(&mddev
->openers
) > !!bdev
) {
5345 printk("md: %s still in use.\n",mdname(mddev
));
5349 if (bdev
&& !test_bit(MD_STILL_CLOSED
, &mddev
->flags
)) {
5350 /* Someone opened the device since we flushed it
5351 * so page cache could be dirty and it is too late
5352 * to flush. So abort
5354 mutex_unlock(&mddev
->open_mutex
);
5358 __md_stop_writes(mddev
);
5364 set_disk_ro(mddev
->gendisk
, 1);
5365 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5366 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5370 mutex_unlock(&mddev
->open_mutex
);
5375 * 0 - completely stop and dis-assemble array
5376 * 2 - stop but do not disassemble array
5378 static int do_md_stop(struct mddev
* mddev
, int mode
,
5379 struct block_device
*bdev
)
5381 struct gendisk
*disk
= mddev
->gendisk
;
5382 struct md_rdev
*rdev
;
5384 mutex_lock(&mddev
->open_mutex
);
5385 if (atomic_read(&mddev
->openers
) > !!bdev
||
5386 mddev
->sysfs_active
) {
5387 printk("md: %s still in use.\n",mdname(mddev
));
5388 mutex_unlock(&mddev
->open_mutex
);
5391 if (bdev
&& !test_bit(MD_STILL_CLOSED
, &mddev
->flags
)) {
5392 /* Someone opened the device since we flushed it
5393 * so page cache could be dirty and it is too late
5394 * to flush. So abort
5396 mutex_unlock(&mddev
->open_mutex
);
5401 set_disk_ro(disk
, 0);
5403 __md_stop_writes(mddev
);
5405 mddev
->queue
->merge_bvec_fn
= NULL
;
5406 mddev
->queue
->backing_dev_info
.congested_fn
= NULL
;
5408 /* tell userspace to handle 'inactive' */
5409 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5411 rdev_for_each(rdev
, mddev
)
5412 if (rdev
->raid_disk
>= 0)
5413 sysfs_unlink_rdev(mddev
, rdev
);
5415 set_capacity(disk
, 0);
5416 mutex_unlock(&mddev
->open_mutex
);
5418 revalidate_disk(disk
);
5423 mutex_unlock(&mddev
->open_mutex
);
5425 * Free resources if final stop
5428 printk(KERN_INFO
"md: %s stopped.\n", mdname(mddev
));
5430 bitmap_destroy(mddev
);
5431 if (mddev
->bitmap_info
.file
) {
5432 restore_bitmap_write_access(mddev
->bitmap_info
.file
);
5433 fput(mddev
->bitmap_info
.file
);
5434 mddev
->bitmap_info
.file
= NULL
;
5436 mddev
->bitmap_info
.offset
= 0;
5438 export_array(mddev
);
5441 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
5442 if (mddev
->hold_active
== UNTIL_STOP
)
5443 mddev
->hold_active
= 0;
5445 blk_integrity_unregister(disk
);
5446 md_new_event(mddev
);
5447 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5452 static void autorun_array(struct mddev
*mddev
)
5454 struct md_rdev
*rdev
;
5457 if (list_empty(&mddev
->disks
))
5460 printk(KERN_INFO
"md: running: ");
5462 rdev_for_each(rdev
, mddev
) {
5463 char b
[BDEVNAME_SIZE
];
5464 printk("<%s>", bdevname(rdev
->bdev
,b
));
5468 err
= do_md_run(mddev
);
5470 printk(KERN_WARNING
"md: do_md_run() returned %d\n", err
);
5471 do_md_stop(mddev
, 0, NULL
);
5476 * lets try to run arrays based on all disks that have arrived
5477 * until now. (those are in pending_raid_disks)
5479 * the method: pick the first pending disk, collect all disks with
5480 * the same UUID, remove all from the pending list and put them into
5481 * the 'same_array' list. Then order this list based on superblock
5482 * update time (freshest comes first), kick out 'old' disks and
5483 * compare superblocks. If everything's fine then run it.
5485 * If "unit" is allocated, then bump its reference count
5487 static void autorun_devices(int part
)
5489 struct md_rdev
*rdev0
, *rdev
, *tmp
;
5490 struct mddev
*mddev
;
5491 char b
[BDEVNAME_SIZE
];
5493 printk(KERN_INFO
"md: autorun ...\n");
5494 while (!list_empty(&pending_raid_disks
)) {
5497 LIST_HEAD(candidates
);
5498 rdev0
= list_entry(pending_raid_disks
.next
,
5499 struct md_rdev
, same_set
);
5501 printk(KERN_INFO
"md: considering %s ...\n",
5502 bdevname(rdev0
->bdev
,b
));
5503 INIT_LIST_HEAD(&candidates
);
5504 rdev_for_each_list(rdev
, tmp
, &pending_raid_disks
)
5505 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
5506 printk(KERN_INFO
"md: adding %s ...\n",
5507 bdevname(rdev
->bdev
,b
));
5508 list_move(&rdev
->same_set
, &candidates
);
5511 * now we have a set of devices, with all of them having
5512 * mostly sane superblocks. It's time to allocate the
5516 dev
= MKDEV(mdp_major
,
5517 rdev0
->preferred_minor
<< MdpMinorShift
);
5518 unit
= MINOR(dev
) >> MdpMinorShift
;
5520 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
5523 if (rdev0
->preferred_minor
!= unit
) {
5524 printk(KERN_INFO
"md: unit number in %s is bad: %d\n",
5525 bdevname(rdev0
->bdev
, b
), rdev0
->preferred_minor
);
5529 md_probe(dev
, NULL
, NULL
);
5530 mddev
= mddev_find(dev
);
5531 if (!mddev
|| !mddev
->gendisk
) {
5535 "md: cannot allocate memory for md drive.\n");
5538 if (mddev_lock(mddev
))
5539 printk(KERN_WARNING
"md: %s locked, cannot run\n",
5541 else if (mddev
->raid_disks
|| mddev
->major_version
5542 || !list_empty(&mddev
->disks
)) {
5544 "md: %s already running, cannot run %s\n",
5545 mdname(mddev
), bdevname(rdev0
->bdev
,b
));
5546 mddev_unlock(mddev
);
5548 printk(KERN_INFO
"md: created %s\n", mdname(mddev
));
5549 mddev
->persistent
= 1;
5550 rdev_for_each_list(rdev
, tmp
, &candidates
) {
5551 list_del_init(&rdev
->same_set
);
5552 if (bind_rdev_to_array(rdev
, mddev
))
5555 autorun_array(mddev
);
5556 mddev_unlock(mddev
);
5558 /* on success, candidates will be empty, on error
5561 rdev_for_each_list(rdev
, tmp
, &candidates
) {
5562 list_del_init(&rdev
->same_set
);
5567 printk(KERN_INFO
"md: ... autorun DONE.\n");
5569 #endif /* !MODULE */
5571 static int get_version(void __user
* arg
)
5575 ver
.major
= MD_MAJOR_VERSION
;
5576 ver
.minor
= MD_MINOR_VERSION
;
5577 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
5579 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
5585 static int get_array_info(struct mddev
* mddev
, void __user
* arg
)
5587 mdu_array_info_t info
;
5588 int nr
,working
,insync
,failed
,spare
;
5589 struct md_rdev
*rdev
;
5591 nr
= working
= insync
= failed
= spare
= 0;
5593 rdev_for_each_rcu(rdev
, mddev
) {
5595 if (test_bit(Faulty
, &rdev
->flags
))
5599 if (test_bit(In_sync
, &rdev
->flags
))
5607 info
.major_version
= mddev
->major_version
;
5608 info
.minor_version
= mddev
->minor_version
;
5609 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
5610 info
.ctime
= mddev
->ctime
;
5611 info
.level
= mddev
->level
;
5612 info
.size
= mddev
->dev_sectors
/ 2;
5613 if (info
.size
!= mddev
->dev_sectors
/ 2) /* overflow */
5616 info
.raid_disks
= mddev
->raid_disks
;
5617 info
.md_minor
= mddev
->md_minor
;
5618 info
.not_persistent
= !mddev
->persistent
;
5620 info
.utime
= mddev
->utime
;
5623 info
.state
= (1<<MD_SB_CLEAN
);
5624 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
5625 info
.state
= (1<<MD_SB_BITMAP_PRESENT
);
5626 info
.active_disks
= insync
;
5627 info
.working_disks
= working
;
5628 info
.failed_disks
= failed
;
5629 info
.spare_disks
= spare
;
5631 info
.layout
= mddev
->layout
;
5632 info
.chunk_size
= mddev
->chunk_sectors
<< 9;
5634 if (copy_to_user(arg
, &info
, sizeof(info
)))
5640 static int get_bitmap_file(struct mddev
* mddev
, void __user
* arg
)
5642 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
5643 char *ptr
, *buf
= NULL
;
5646 file
= kmalloc(sizeof(*file
), GFP_NOIO
);
5651 /* bitmap disabled, zero the first byte and copy out */
5652 if (!mddev
->bitmap
|| !mddev
->bitmap
->storage
.file
) {
5653 file
->pathname
[0] = '\0';
5657 buf
= kmalloc(sizeof(file
->pathname
), GFP_KERNEL
);
5661 ptr
= d_path(&mddev
->bitmap
->storage
.file
->f_path
,
5662 buf
, sizeof(file
->pathname
));
5666 strcpy(file
->pathname
, ptr
);
5670 if (copy_to_user(arg
, file
, sizeof(*file
)))
5678 static int get_disk_info(struct mddev
* mddev
, void __user
* arg
)
5680 mdu_disk_info_t info
;
5681 struct md_rdev
*rdev
;
5683 if (copy_from_user(&info
, arg
, sizeof(info
)))
5687 rdev
= find_rdev_nr_rcu(mddev
, info
.number
);
5689 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
5690 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
5691 info
.raid_disk
= rdev
->raid_disk
;
5693 if (test_bit(Faulty
, &rdev
->flags
))
5694 info
.state
|= (1<<MD_DISK_FAULTY
);
5695 else if (test_bit(In_sync
, &rdev
->flags
)) {
5696 info
.state
|= (1<<MD_DISK_ACTIVE
);
5697 info
.state
|= (1<<MD_DISK_SYNC
);
5699 if (test_bit(WriteMostly
, &rdev
->flags
))
5700 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
5702 info
.major
= info
.minor
= 0;
5703 info
.raid_disk
= -1;
5704 info
.state
= (1<<MD_DISK_REMOVED
);
5708 if (copy_to_user(arg
, &info
, sizeof(info
)))
5714 static int add_new_disk(struct mddev
* mddev
, mdu_disk_info_t
*info
)
5716 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
5717 struct md_rdev
*rdev
;
5718 dev_t dev
= MKDEV(info
->major
,info
->minor
);
5720 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
5723 if (!mddev
->raid_disks
) {
5725 /* expecting a device which has a superblock */
5726 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
5729 "md: md_import_device returned %ld\n",
5731 return PTR_ERR(rdev
);
5733 if (!list_empty(&mddev
->disks
)) {
5734 struct md_rdev
*rdev0
5735 = list_entry(mddev
->disks
.next
,
5736 struct md_rdev
, same_set
);
5737 err
= super_types
[mddev
->major_version
]
5738 .load_super(rdev
, rdev0
, mddev
->minor_version
);
5741 "md: %s has different UUID to %s\n",
5742 bdevname(rdev
->bdev
,b
),
5743 bdevname(rdev0
->bdev
,b2
));
5748 err
= bind_rdev_to_array(rdev
, mddev
);
5755 * add_new_disk can be used once the array is assembled
5756 * to add "hot spares". They must already have a superblock
5761 if (!mddev
->pers
->hot_add_disk
) {
5763 "%s: personality does not support diskops!\n",
5767 if (mddev
->persistent
)
5768 rdev
= md_import_device(dev
, mddev
->major_version
,
5769 mddev
->minor_version
);
5771 rdev
= md_import_device(dev
, -1, -1);
5774 "md: md_import_device returned %ld\n",
5776 return PTR_ERR(rdev
);
5778 /* set saved_raid_disk if appropriate */
5779 if (!mddev
->persistent
) {
5780 if (info
->state
& (1<<MD_DISK_SYNC
) &&
5781 info
->raid_disk
< mddev
->raid_disks
) {
5782 rdev
->raid_disk
= info
->raid_disk
;
5783 set_bit(In_sync
, &rdev
->flags
);
5785 rdev
->raid_disk
= -1;
5787 super_types
[mddev
->major_version
].
5788 validate_super(mddev
, rdev
);
5789 if ((info
->state
& (1<<MD_DISK_SYNC
)) &&
5790 rdev
->raid_disk
!= info
->raid_disk
) {
5791 /* This was a hot-add request, but events doesn't
5792 * match, so reject it.
5798 if (test_bit(In_sync
, &rdev
->flags
))
5799 rdev
->saved_raid_disk
= rdev
->raid_disk
;
5801 rdev
->saved_raid_disk
= -1;
5803 clear_bit(In_sync
, &rdev
->flags
); /* just to be sure */
5804 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
5805 set_bit(WriteMostly
, &rdev
->flags
);
5807 clear_bit(WriteMostly
, &rdev
->flags
);
5809 rdev
->raid_disk
= -1;
5810 err
= bind_rdev_to_array(rdev
, mddev
);
5811 if (!err
&& !mddev
->pers
->hot_remove_disk
) {
5812 /* If there is hot_add_disk but no hot_remove_disk
5813 * then added disks for geometry changes,
5814 * and should be added immediately.
5816 super_types
[mddev
->major_version
].
5817 validate_super(mddev
, rdev
);
5818 err
= mddev
->pers
->hot_add_disk(mddev
, rdev
);
5820 unbind_rdev_from_array(rdev
);
5825 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
5827 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
5828 if (mddev
->degraded
)
5829 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
5830 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5832 md_new_event(mddev
);
5833 md_wakeup_thread(mddev
->thread
);
5837 /* otherwise, add_new_disk is only allowed
5838 * for major_version==0 superblocks
5840 if (mddev
->major_version
!= 0) {
5841 printk(KERN_WARNING
"%s: ADD_NEW_DISK not supported\n",
5846 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
5848 rdev
= md_import_device(dev
, -1, 0);
5851 "md: error, md_import_device() returned %ld\n",
5853 return PTR_ERR(rdev
);
5855 rdev
->desc_nr
= info
->number
;
5856 if (info
->raid_disk
< mddev
->raid_disks
)
5857 rdev
->raid_disk
= info
->raid_disk
;
5859 rdev
->raid_disk
= -1;
5861 if (rdev
->raid_disk
< mddev
->raid_disks
)
5862 if (info
->state
& (1<<MD_DISK_SYNC
))
5863 set_bit(In_sync
, &rdev
->flags
);
5865 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
5866 set_bit(WriteMostly
, &rdev
->flags
);
5868 if (!mddev
->persistent
) {
5869 printk(KERN_INFO
"md: nonpersistent superblock ...\n");
5870 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
5872 rdev
->sb_start
= calc_dev_sboffset(rdev
);
5873 rdev
->sectors
= rdev
->sb_start
;
5875 err
= bind_rdev_to_array(rdev
, mddev
);
5885 static int hot_remove_disk(struct mddev
* mddev
, dev_t dev
)
5887 char b
[BDEVNAME_SIZE
];
5888 struct md_rdev
*rdev
;
5890 rdev
= find_rdev(mddev
, dev
);
5894 clear_bit(Blocked
, &rdev
->flags
);
5895 remove_and_add_spares(mddev
, rdev
);
5897 if (rdev
->raid_disk
>= 0)
5900 kick_rdev_from_array(rdev
);
5901 md_update_sb(mddev
, 1);
5902 md_new_event(mddev
);
5906 printk(KERN_WARNING
"md: cannot remove active disk %s from %s ...\n",
5907 bdevname(rdev
->bdev
,b
), mdname(mddev
));
5911 static int hot_add_disk(struct mddev
* mddev
, dev_t dev
)
5913 char b
[BDEVNAME_SIZE
];
5915 struct md_rdev
*rdev
;
5920 if (mddev
->major_version
!= 0) {
5921 printk(KERN_WARNING
"%s: HOT_ADD may only be used with"
5922 " version-0 superblocks.\n",
5926 if (!mddev
->pers
->hot_add_disk
) {
5928 "%s: personality does not support diskops!\n",
5933 rdev
= md_import_device(dev
, -1, 0);
5936 "md: error, md_import_device() returned %ld\n",
5941 if (mddev
->persistent
)
5942 rdev
->sb_start
= calc_dev_sboffset(rdev
);
5944 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
5946 rdev
->sectors
= rdev
->sb_start
;
5948 if (test_bit(Faulty
, &rdev
->flags
)) {
5950 "md: can not hot-add faulty %s disk to %s!\n",
5951 bdevname(rdev
->bdev
,b
), mdname(mddev
));
5955 clear_bit(In_sync
, &rdev
->flags
);
5957 rdev
->saved_raid_disk
= -1;
5958 err
= bind_rdev_to_array(rdev
, mddev
);
5963 * The rest should better be atomic, we can have disk failures
5964 * noticed in interrupt contexts ...
5967 rdev
->raid_disk
= -1;
5969 md_update_sb(mddev
, 1);
5972 * Kick recovery, maybe this spare has to be added to the
5973 * array immediately.
5975 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5976 md_wakeup_thread(mddev
->thread
);
5977 md_new_event(mddev
);
5985 static int set_bitmap_file(struct mddev
*mddev
, int fd
)
5990 if (!mddev
->pers
->quiesce
)
5992 if (mddev
->recovery
|| mddev
->sync_thread
)
5994 /* we should be able to change the bitmap.. */
6000 return -EEXIST
; /* cannot add when bitmap is present */
6001 mddev
->bitmap_info
.file
= fget(fd
);
6003 if (mddev
->bitmap_info
.file
== NULL
) {
6004 printk(KERN_ERR
"%s: error: failed to get bitmap file\n",
6009 err
= deny_bitmap_write_access(mddev
->bitmap_info
.file
);
6011 printk(KERN_ERR
"%s: error: bitmap file is already in use\n",
6013 fput(mddev
->bitmap_info
.file
);
6014 mddev
->bitmap_info
.file
= NULL
;
6017 mddev
->bitmap_info
.offset
= 0; /* file overrides offset */
6018 } else if (mddev
->bitmap
== NULL
)
6019 return -ENOENT
; /* cannot remove what isn't there */
6022 mddev
->pers
->quiesce(mddev
, 1);
6024 err
= bitmap_create(mddev
);
6026 err
= bitmap_load(mddev
);
6028 if (fd
< 0 || err
) {
6029 bitmap_destroy(mddev
);
6030 fd
= -1; /* make sure to put the file */
6032 mddev
->pers
->quiesce(mddev
, 0);
6035 if (mddev
->bitmap_info
.file
) {
6036 restore_bitmap_write_access(mddev
->bitmap_info
.file
);
6037 fput(mddev
->bitmap_info
.file
);
6039 mddev
->bitmap_info
.file
= NULL
;
6046 * set_array_info is used two different ways
6047 * The original usage is when creating a new array.
6048 * In this usage, raid_disks is > 0 and it together with
6049 * level, size, not_persistent,layout,chunksize determine the
6050 * shape of the array.
6051 * This will always create an array with a type-0.90.0 superblock.
6052 * The newer usage is when assembling an array.
6053 * In this case raid_disks will be 0, and the major_version field is
6054 * use to determine which style super-blocks are to be found on the devices.
6055 * The minor and patch _version numbers are also kept incase the
6056 * super_block handler wishes to interpret them.
6058 static int set_array_info(struct mddev
* mddev
, mdu_array_info_t
*info
)
6061 if (info
->raid_disks
== 0) {
6062 /* just setting version number for superblock loading */
6063 if (info
->major_version
< 0 ||
6064 info
->major_version
>= ARRAY_SIZE(super_types
) ||
6065 super_types
[info
->major_version
].name
== NULL
) {
6066 /* maybe try to auto-load a module? */
6068 "md: superblock version %d not known\n",
6069 info
->major_version
);
6072 mddev
->major_version
= info
->major_version
;
6073 mddev
->minor_version
= info
->minor_version
;
6074 mddev
->patch_version
= info
->patch_version
;
6075 mddev
->persistent
= !info
->not_persistent
;
6076 /* ensure mddev_put doesn't delete this now that there
6077 * is some minimal configuration.
6079 mddev
->ctime
= get_seconds();
6082 mddev
->major_version
= MD_MAJOR_VERSION
;
6083 mddev
->minor_version
= MD_MINOR_VERSION
;
6084 mddev
->patch_version
= MD_PATCHLEVEL_VERSION
;
6085 mddev
->ctime
= get_seconds();
6087 mddev
->level
= info
->level
;
6088 mddev
->clevel
[0] = 0;
6089 mddev
->dev_sectors
= 2 * (sector_t
)info
->size
;
6090 mddev
->raid_disks
= info
->raid_disks
;
6091 /* don't set md_minor, it is determined by which /dev/md* was
6094 if (info
->state
& (1<<MD_SB_CLEAN
))
6095 mddev
->recovery_cp
= MaxSector
;
6097 mddev
->recovery_cp
= 0;
6098 mddev
->persistent
= ! info
->not_persistent
;
6099 mddev
->external
= 0;
6101 mddev
->layout
= info
->layout
;
6102 mddev
->chunk_sectors
= info
->chunk_size
>> 9;
6104 mddev
->max_disks
= MD_SB_DISKS
;
6106 if (mddev
->persistent
)
6108 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
6110 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
6111 mddev
->bitmap_info
.default_space
= 64*2 - (MD_SB_BYTES
>> 9);
6112 mddev
->bitmap_info
.offset
= 0;
6114 mddev
->reshape_position
= MaxSector
;
6117 * Generate a 128 bit UUID
6119 get_random_bytes(mddev
->uuid
, 16);
6121 mddev
->new_level
= mddev
->level
;
6122 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
6123 mddev
->new_layout
= mddev
->layout
;
6124 mddev
->delta_disks
= 0;
6125 mddev
->reshape_backwards
= 0;
6130 void md_set_array_sectors(struct mddev
*mddev
, sector_t array_sectors
)
6132 WARN(!mddev_is_locked(mddev
), "%s: unlocked mddev!\n", __func__
);
6134 if (mddev
->external_size
)
6137 mddev
->array_sectors
= array_sectors
;
6139 EXPORT_SYMBOL(md_set_array_sectors
);
6141 static int update_size(struct mddev
*mddev
, sector_t num_sectors
)
6143 struct md_rdev
*rdev
;
6145 int fit
= (num_sectors
== 0);
6147 if (mddev
->pers
->resize
== NULL
)
6149 /* The "num_sectors" is the number of sectors of each device that
6150 * is used. This can only make sense for arrays with redundancy.
6151 * linear and raid0 always use whatever space is available. We can only
6152 * consider changing this number if no resync or reconstruction is
6153 * happening, and if the new size is acceptable. It must fit before the
6154 * sb_start or, if that is <data_offset, it must fit before the size
6155 * of each device. If num_sectors is zero, we find the largest size
6158 if (mddev
->sync_thread
)
6161 rdev_for_each(rdev
, mddev
) {
6162 sector_t avail
= rdev
->sectors
;
6164 if (fit
&& (num_sectors
== 0 || num_sectors
> avail
))
6165 num_sectors
= avail
;
6166 if (avail
< num_sectors
)
6169 rv
= mddev
->pers
->resize(mddev
, num_sectors
);
6171 revalidate_disk(mddev
->gendisk
);
6175 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
)
6178 struct md_rdev
*rdev
;
6179 /* change the number of raid disks */
6180 if (mddev
->pers
->check_reshape
== NULL
)
6182 if (raid_disks
<= 0 ||
6183 (mddev
->max_disks
&& raid_disks
>= mddev
->max_disks
))
6185 if (mddev
->sync_thread
|| mddev
->reshape_position
!= MaxSector
)
6188 rdev_for_each(rdev
, mddev
) {
6189 if (mddev
->raid_disks
< raid_disks
&&
6190 rdev
->data_offset
< rdev
->new_data_offset
)
6192 if (mddev
->raid_disks
> raid_disks
&&
6193 rdev
->data_offset
> rdev
->new_data_offset
)
6197 mddev
->delta_disks
= raid_disks
- mddev
->raid_disks
;
6198 if (mddev
->delta_disks
< 0)
6199 mddev
->reshape_backwards
= 1;
6200 else if (mddev
->delta_disks
> 0)
6201 mddev
->reshape_backwards
= 0;
6203 rv
= mddev
->pers
->check_reshape(mddev
);
6205 mddev
->delta_disks
= 0;
6206 mddev
->reshape_backwards
= 0;
6213 * update_array_info is used to change the configuration of an
6215 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
6216 * fields in the info are checked against the array.
6217 * Any differences that cannot be handled will cause an error.
6218 * Normally, only one change can be managed at a time.
6220 static int update_array_info(struct mddev
*mddev
, mdu_array_info_t
*info
)
6226 /* calculate expected state,ignoring low bits */
6227 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
6228 state
|= (1 << MD_SB_BITMAP_PRESENT
);
6230 if (mddev
->major_version
!= info
->major_version
||
6231 mddev
->minor_version
!= info
->minor_version
||
6232 /* mddev->patch_version != info->patch_version || */
6233 mddev
->ctime
!= info
->ctime
||
6234 mddev
->level
!= info
->level
||
6235 /* mddev->layout != info->layout || */
6236 !mddev
->persistent
!= info
->not_persistent
||
6237 mddev
->chunk_sectors
!= info
->chunk_size
>> 9 ||
6238 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
6239 ((state
^info
->state
) & 0xfffffe00)
6242 /* Check there is only one change */
6243 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
6245 if (mddev
->raid_disks
!= info
->raid_disks
)
6247 if (mddev
->layout
!= info
->layout
)
6249 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
))
6256 if (mddev
->layout
!= info
->layout
) {
6258 * we don't need to do anything at the md level, the
6259 * personality will take care of it all.
6261 if (mddev
->pers
->check_reshape
== NULL
)
6264 mddev
->new_layout
= info
->layout
;
6265 rv
= mddev
->pers
->check_reshape(mddev
);
6267 mddev
->new_layout
= mddev
->layout
;
6271 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
6272 rv
= update_size(mddev
, (sector_t
)info
->size
* 2);
6274 if (mddev
->raid_disks
!= info
->raid_disks
)
6275 rv
= update_raid_disks(mddev
, info
->raid_disks
);
6277 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) {
6278 if (mddev
->pers
->quiesce
== NULL
)
6280 if (mddev
->recovery
|| mddev
->sync_thread
)
6282 if (info
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
6283 /* add the bitmap */
6286 if (mddev
->bitmap_info
.default_offset
== 0)
6288 mddev
->bitmap_info
.offset
=
6289 mddev
->bitmap_info
.default_offset
;
6290 mddev
->bitmap_info
.space
=
6291 mddev
->bitmap_info
.default_space
;
6292 mddev
->pers
->quiesce(mddev
, 1);
6293 rv
= bitmap_create(mddev
);
6295 rv
= bitmap_load(mddev
);
6297 bitmap_destroy(mddev
);
6298 mddev
->pers
->quiesce(mddev
, 0);
6300 /* remove the bitmap */
6303 if (mddev
->bitmap
->storage
.file
)
6305 mddev
->pers
->quiesce(mddev
, 1);
6306 bitmap_destroy(mddev
);
6307 mddev
->pers
->quiesce(mddev
, 0);
6308 mddev
->bitmap_info
.offset
= 0;
6311 md_update_sb(mddev
, 1);
6315 static int set_disk_faulty(struct mddev
*mddev
, dev_t dev
)
6317 struct md_rdev
*rdev
;
6320 if (mddev
->pers
== NULL
)
6324 rdev
= find_rdev_rcu(mddev
, dev
);
6328 md_error(mddev
, rdev
);
6329 if (!test_bit(Faulty
, &rdev
->flags
))
6337 * We have a problem here : there is no easy way to give a CHS
6338 * virtual geometry. We currently pretend that we have a 2 heads
6339 * 4 sectors (with a BIG number of cylinders...). This drives
6340 * dosfs just mad... ;-)
6342 static int md_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
6344 struct mddev
*mddev
= bdev
->bd_disk
->private_data
;
6348 geo
->cylinders
= mddev
->array_sectors
/ 8;
6352 static int md_ioctl(struct block_device
*bdev
, fmode_t mode
,
6353 unsigned int cmd
, unsigned long arg
)
6356 void __user
*argp
= (void __user
*)arg
;
6357 struct mddev
*mddev
= NULL
;
6362 case GET_ARRAY_INFO
:
6366 if (!capable(CAP_SYS_ADMIN
))
6371 * Commands dealing with the RAID driver but not any
6376 err
= get_version(argp
);
6379 case PRINT_RAID_DEBUG
:
6387 autostart_arrays(arg
);
6394 * Commands creating/starting a new array:
6397 mddev
= bdev
->bd_disk
->private_data
;
6404 /* Some actions do not requires the mutex */
6406 case GET_ARRAY_INFO
:
6407 if (!mddev
->raid_disks
&& !mddev
->external
)
6410 err
= get_array_info(mddev
, argp
);
6414 if (!mddev
->raid_disks
&& !mddev
->external
)
6417 err
= get_disk_info(mddev
, argp
);
6420 case SET_DISK_FAULTY
:
6421 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
6425 if (cmd
== ADD_NEW_DISK
)
6426 /* need to ensure md_delayed_delete() has completed */
6427 flush_workqueue(md_misc_wq
);
6429 if (cmd
== HOT_REMOVE_DISK
)
6430 /* need to ensure recovery thread has run */
6431 wait_event_interruptible_timeout(mddev
->sb_wait
,
6432 !test_bit(MD_RECOVERY_NEEDED
,
6434 msecs_to_jiffies(5000));
6435 if (cmd
== STOP_ARRAY
|| cmd
== STOP_ARRAY_RO
) {
6436 /* Need to flush page cache, and ensure no-one else opens
6439 mutex_lock(&mddev
->open_mutex
);
6440 if (atomic_read(&mddev
->openers
) > 1) {
6441 mutex_unlock(&mddev
->open_mutex
);
6445 set_bit(MD_STILL_CLOSED
, &mddev
->flags
);
6446 mutex_unlock(&mddev
->open_mutex
);
6447 sync_blockdev(bdev
);
6449 err
= mddev_lock(mddev
);
6452 "md: ioctl lock interrupted, reason %d, cmd %d\n",
6457 if (cmd
== SET_ARRAY_INFO
) {
6458 mdu_array_info_t info
;
6460 memset(&info
, 0, sizeof(info
));
6461 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
6466 err
= update_array_info(mddev
, &info
);
6468 printk(KERN_WARNING
"md: couldn't update"
6469 " array info. %d\n", err
);
6474 if (!list_empty(&mddev
->disks
)) {
6476 "md: array %s already has disks!\n",
6481 if (mddev
->raid_disks
) {
6483 "md: array %s already initialised!\n",
6488 err
= set_array_info(mddev
, &info
);
6490 printk(KERN_WARNING
"md: couldn't set"
6491 " array info. %d\n", err
);
6498 * Commands querying/configuring an existing array:
6500 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
6501 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
6502 if ((!mddev
->raid_disks
&& !mddev
->external
)
6503 && cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
6504 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
6505 && cmd
!= GET_BITMAP_FILE
) {
6511 * Commands even a read-only array can execute:
6514 case GET_BITMAP_FILE
:
6515 err
= get_bitmap_file(mddev
, argp
);
6518 case RESTART_ARRAY_RW
:
6519 err
= restart_array(mddev
);
6523 err
= do_md_stop(mddev
, 0, bdev
);
6527 err
= md_set_readonly(mddev
, bdev
);
6530 case HOT_REMOVE_DISK
:
6531 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
6535 /* We can support ADD_NEW_DISK on read-only arrays
6536 * on if we are re-adding a preexisting device.
6537 * So require mddev->pers and MD_DISK_SYNC.
6540 mdu_disk_info_t info
;
6541 if (copy_from_user(&info
, argp
, sizeof(info
)))
6543 else if (!(info
.state
& (1<<MD_DISK_SYNC
)))
6544 /* Need to clear read-only for this */
6547 err
= add_new_disk(mddev
, &info
);
6553 if (get_user(ro
, (int __user
*)(arg
))) {
6559 /* if the bdev is going readonly the value of mddev->ro
6560 * does not matter, no writes are coming
6565 /* are we are already prepared for writes? */
6569 /* transitioning to readauto need only happen for
6570 * arrays that call md_write_start
6573 err
= restart_array(mddev
);
6576 set_disk_ro(mddev
->gendisk
, 0);
6583 * The remaining ioctls are changing the state of the
6584 * superblock, so we do not allow them on read-only arrays.
6585 * However non-MD ioctls (e.g. get-size) will still come through
6586 * here and hit the 'default' below, so only disallow
6587 * 'md' ioctls, and switch to rw mode if started auto-readonly.
6589 if (_IOC_TYPE(cmd
) == MD_MAJOR
&& mddev
->ro
&& mddev
->pers
) {
6590 if (mddev
->ro
== 2) {
6592 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6593 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6594 /* mddev_unlock will wake thread */
6595 /* If a device failed while we were read-only, we
6596 * need to make sure the metadata is updated now.
6598 if (test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
6599 mddev_unlock(mddev
);
6600 wait_event(mddev
->sb_wait
,
6601 !test_bit(MD_CHANGE_DEVS
, &mddev
->flags
) &&
6602 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
6603 mddev_lock_nointr(mddev
);
6614 mdu_disk_info_t info
;
6615 if (copy_from_user(&info
, argp
, sizeof(info
)))
6618 err
= add_new_disk(mddev
, &info
);
6623 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
6627 err
= do_md_run(mddev
);
6630 case SET_BITMAP_FILE
:
6631 err
= set_bitmap_file(mddev
, (int)arg
);
6641 if (mddev
->hold_active
== UNTIL_IOCTL
&&
6643 mddev
->hold_active
= 0;
6644 mddev_unlock(mddev
);
6653 #ifdef CONFIG_COMPAT
6654 static int md_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
6655 unsigned int cmd
, unsigned long arg
)
6658 case HOT_REMOVE_DISK
:
6660 case SET_DISK_FAULTY
:
6661 case SET_BITMAP_FILE
:
6662 /* These take in integer arg, do not convert */
6665 arg
= (unsigned long)compat_ptr(arg
);
6669 return md_ioctl(bdev
, mode
, cmd
, arg
);
6671 #endif /* CONFIG_COMPAT */
6673 static int md_open(struct block_device
*bdev
, fmode_t mode
)
6676 * Succeed if we can lock the mddev, which confirms that
6677 * it isn't being stopped right now.
6679 struct mddev
*mddev
= mddev_find(bdev
->bd_dev
);
6685 if (mddev
->gendisk
!= bdev
->bd_disk
) {
6686 /* we are racing with mddev_put which is discarding this
6690 /* Wait until bdev->bd_disk is definitely gone */
6691 flush_workqueue(md_misc_wq
);
6692 /* Then retry the open from the top */
6693 return -ERESTARTSYS
;
6695 BUG_ON(mddev
!= bdev
->bd_disk
->private_data
);
6697 if ((err
= mutex_lock_interruptible(&mddev
->open_mutex
)))
6701 atomic_inc(&mddev
->openers
);
6702 clear_bit(MD_STILL_CLOSED
, &mddev
->flags
);
6703 mutex_unlock(&mddev
->open_mutex
);
6705 check_disk_change(bdev
);
6710 static void md_release(struct gendisk
*disk
, fmode_t mode
)
6712 struct mddev
*mddev
= disk
->private_data
;
6715 atomic_dec(&mddev
->openers
);
6719 static int md_media_changed(struct gendisk
*disk
)
6721 struct mddev
*mddev
= disk
->private_data
;
6723 return mddev
->changed
;
6726 static int md_revalidate(struct gendisk
*disk
)
6728 struct mddev
*mddev
= disk
->private_data
;
6733 static const struct block_device_operations md_fops
=
6735 .owner
= THIS_MODULE
,
6737 .release
= md_release
,
6739 #ifdef CONFIG_COMPAT
6740 .compat_ioctl
= md_compat_ioctl
,
6742 .getgeo
= md_getgeo
,
6743 .media_changed
= md_media_changed
,
6744 .revalidate_disk
= md_revalidate
,
6747 static int md_thread(void * arg
)
6749 struct md_thread
*thread
= arg
;
6752 * md_thread is a 'system-thread', it's priority should be very
6753 * high. We avoid resource deadlocks individually in each
6754 * raid personality. (RAID5 does preallocation) We also use RR and
6755 * the very same RT priority as kswapd, thus we will never get
6756 * into a priority inversion deadlock.
6758 * we definitely have to have equal or higher priority than
6759 * bdflush, otherwise bdflush will deadlock if there are too
6760 * many dirty RAID5 blocks.
6763 allow_signal(SIGKILL
);
6764 while (!kthread_should_stop()) {
6766 /* We need to wait INTERRUPTIBLE so that
6767 * we don't add to the load-average.
6768 * That means we need to be sure no signals are
6771 if (signal_pending(current
))
6772 flush_signals(current
);
6774 wait_event_interruptible_timeout
6776 test_bit(THREAD_WAKEUP
, &thread
->flags
)
6777 || kthread_should_stop(),
6780 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
6781 if (!kthread_should_stop())
6782 thread
->run(thread
);
6788 void md_wakeup_thread(struct md_thread
*thread
)
6791 pr_debug("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
6792 set_bit(THREAD_WAKEUP
, &thread
->flags
);
6793 wake_up(&thread
->wqueue
);
6797 struct md_thread
*md_register_thread(void (*run
) (struct md_thread
*),
6798 struct mddev
*mddev
, const char *name
)
6800 struct md_thread
*thread
;
6802 thread
= kzalloc(sizeof(struct md_thread
), GFP_KERNEL
);
6806 init_waitqueue_head(&thread
->wqueue
);
6809 thread
->mddev
= mddev
;
6810 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
6811 thread
->tsk
= kthread_run(md_thread
, thread
,
6813 mdname(thread
->mddev
),
6815 if (IS_ERR(thread
->tsk
)) {
6822 void md_unregister_thread(struct md_thread
**threadp
)
6824 struct md_thread
*thread
= *threadp
;
6827 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread
->tsk
));
6828 /* Locking ensures that mddev_unlock does not wake_up a
6829 * non-existent thread
6831 spin_lock(&pers_lock
);
6833 spin_unlock(&pers_lock
);
6835 kthread_stop(thread
->tsk
);
6839 void md_error(struct mddev
*mddev
, struct md_rdev
*rdev
)
6846 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
6849 if (!mddev
->pers
|| !mddev
->pers
->error_handler
)
6851 mddev
->pers
->error_handler(mddev
,rdev
);
6852 if (mddev
->degraded
)
6853 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
6854 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
6855 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6856 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6857 md_wakeup_thread(mddev
->thread
);
6858 if (mddev
->event_work
.func
)
6859 queue_work(md_misc_wq
, &mddev
->event_work
);
6860 md_new_event_inintr(mddev
);
6863 /* seq_file implementation /proc/mdstat */
6865 static void status_unused(struct seq_file
*seq
)
6868 struct md_rdev
*rdev
;
6870 seq_printf(seq
, "unused devices: ");
6872 list_for_each_entry(rdev
, &pending_raid_disks
, same_set
) {
6873 char b
[BDEVNAME_SIZE
];
6875 seq_printf(seq
, "%s ",
6876 bdevname(rdev
->bdev
,b
));
6879 seq_printf(seq
, "<none>");
6881 seq_printf(seq
, "\n");
6885 static void status_resync(struct seq_file
*seq
, struct mddev
* mddev
)
6887 sector_t max_sectors
, resync
, res
;
6888 unsigned long dt
, db
;
6891 unsigned int per_milli
;
6893 if (mddev
->curr_resync
<= 3)
6896 resync
= mddev
->curr_resync
6897 - atomic_read(&mddev
->recovery_active
);
6899 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
6900 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
6901 max_sectors
= mddev
->resync_max_sectors
;
6903 max_sectors
= mddev
->dev_sectors
;
6906 * Should not happen.
6912 /* Pick 'scale' such that (resync>>scale)*1000 will fit
6913 * in a sector_t, and (max_sectors>>scale) will fit in a
6914 * u32, as those are the requirements for sector_div.
6915 * Thus 'scale' must be at least 10
6918 if (sizeof(sector_t
) > sizeof(unsigned long)) {
6919 while ( max_sectors
/2 > (1ULL<<(scale
+32)))
6922 res
= (resync
>>scale
)*1000;
6923 sector_div(res
, (u32
)((max_sectors
>>scale
)+1));
6927 int i
, x
= per_milli
/50, y
= 20-x
;
6928 seq_printf(seq
, "[");
6929 for (i
= 0; i
< x
; i
++)
6930 seq_printf(seq
, "=");
6931 seq_printf(seq
, ">");
6932 for (i
= 0; i
< y
; i
++)
6933 seq_printf(seq
, ".");
6934 seq_printf(seq
, "] ");
6936 seq_printf(seq
, " %s =%3u.%u%% (%llu/%llu)",
6937 (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)?
6939 (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)?
6941 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
6942 "resync" : "recovery"))),
6943 per_milli
/10, per_milli
% 10,
6944 (unsigned long long) resync
/2,
6945 (unsigned long long) max_sectors
/2);
6948 * dt: time from mark until now
6949 * db: blocks written from mark until now
6950 * rt: remaining time
6952 * rt is a sector_t, so could be 32bit or 64bit.
6953 * So we divide before multiply in case it is 32bit and close
6955 * We scale the divisor (db) by 32 to avoid losing precision
6956 * near the end of resync when the number of remaining sectors
6958 * We then divide rt by 32 after multiplying by db to compensate.
6959 * The '+1' avoids division by zero if db is very small.
6961 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
6963 db
= (mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
))
6964 - mddev
->resync_mark_cnt
;
6966 rt
= max_sectors
- resync
; /* number of remaining sectors */
6967 sector_div(rt
, db
/32+1);
6971 seq_printf(seq
, " finish=%lu.%lumin", (unsigned long)rt
/ 60,
6972 ((unsigned long)rt
% 60)/6);
6974 seq_printf(seq
, " speed=%ldK/sec", db
/2/dt
);
6977 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
6979 struct list_head
*tmp
;
6981 struct mddev
*mddev
;
6989 spin_lock(&all_mddevs_lock
);
6990 list_for_each(tmp
,&all_mddevs
)
6992 mddev
= list_entry(tmp
, struct mddev
, all_mddevs
);
6994 spin_unlock(&all_mddevs_lock
);
6997 spin_unlock(&all_mddevs_lock
);
6999 return (void*)2;/* tail */
7003 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
7005 struct list_head
*tmp
;
7006 struct mddev
*next_mddev
, *mddev
= v
;
7012 spin_lock(&all_mddevs_lock
);
7014 tmp
= all_mddevs
.next
;
7016 tmp
= mddev
->all_mddevs
.next
;
7017 if (tmp
!= &all_mddevs
)
7018 next_mddev
= mddev_get(list_entry(tmp
,struct mddev
,all_mddevs
));
7020 next_mddev
= (void*)2;
7023 spin_unlock(&all_mddevs_lock
);
7031 static void md_seq_stop(struct seq_file
*seq
, void *v
)
7033 struct mddev
*mddev
= v
;
7035 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
7039 static int md_seq_show(struct seq_file
*seq
, void *v
)
7041 struct mddev
*mddev
= v
;
7043 struct md_rdev
*rdev
;
7045 if (v
== (void*)1) {
7046 struct md_personality
*pers
;
7047 seq_printf(seq
, "Personalities : ");
7048 spin_lock(&pers_lock
);
7049 list_for_each_entry(pers
, &pers_list
, list
)
7050 seq_printf(seq
, "[%s] ", pers
->name
);
7052 spin_unlock(&pers_lock
);
7053 seq_printf(seq
, "\n");
7054 seq
->poll_event
= atomic_read(&md_event_count
);
7057 if (v
== (void*)2) {
7062 if (mddev_lock(mddev
) < 0)
7065 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
7066 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
7067 mddev
->pers
? "" : "in");
7070 seq_printf(seq
, " (read-only)");
7072 seq_printf(seq
, " (auto-read-only)");
7073 seq_printf(seq
, " %s", mddev
->pers
->name
);
7077 rdev_for_each(rdev
, mddev
) {
7078 char b
[BDEVNAME_SIZE
];
7079 seq_printf(seq
, " %s[%d]",
7080 bdevname(rdev
->bdev
,b
), rdev
->desc_nr
);
7081 if (test_bit(WriteMostly
, &rdev
->flags
))
7082 seq_printf(seq
, "(W)");
7083 if (test_bit(Faulty
, &rdev
->flags
)) {
7084 seq_printf(seq
, "(F)");
7087 if (rdev
->raid_disk
< 0)
7088 seq_printf(seq
, "(S)"); /* spare */
7089 if (test_bit(Replacement
, &rdev
->flags
))
7090 seq_printf(seq
, "(R)");
7091 sectors
+= rdev
->sectors
;
7094 if (!list_empty(&mddev
->disks
)) {
7096 seq_printf(seq
, "\n %llu blocks",
7097 (unsigned long long)
7098 mddev
->array_sectors
/ 2);
7100 seq_printf(seq
, "\n %llu blocks",
7101 (unsigned long long)sectors
/ 2);
7103 if (mddev
->persistent
) {
7104 if (mddev
->major_version
!= 0 ||
7105 mddev
->minor_version
!= 90) {
7106 seq_printf(seq
," super %d.%d",
7107 mddev
->major_version
,
7108 mddev
->minor_version
);
7110 } else if (mddev
->external
)
7111 seq_printf(seq
, " super external:%s",
7112 mddev
->metadata_type
);
7114 seq_printf(seq
, " super non-persistent");
7117 mddev
->pers
->status(seq
, mddev
);
7118 seq_printf(seq
, "\n ");
7119 if (mddev
->pers
->sync_request
) {
7120 if (mddev
->curr_resync
> 2) {
7121 status_resync(seq
, mddev
);
7122 seq_printf(seq
, "\n ");
7123 } else if (mddev
->curr_resync
>= 1)
7124 seq_printf(seq
, "\tresync=DELAYED\n ");
7125 else if (mddev
->recovery_cp
< MaxSector
)
7126 seq_printf(seq
, "\tresync=PENDING\n ");
7129 seq_printf(seq
, "\n ");
7131 bitmap_status(seq
, mddev
->bitmap
);
7133 seq_printf(seq
, "\n");
7135 mddev_unlock(mddev
);
7140 static const struct seq_operations md_seq_ops
= {
7141 .start
= md_seq_start
,
7142 .next
= md_seq_next
,
7143 .stop
= md_seq_stop
,
7144 .show
= md_seq_show
,
7147 static int md_seq_open(struct inode
*inode
, struct file
*file
)
7149 struct seq_file
*seq
;
7152 error
= seq_open(file
, &md_seq_ops
);
7156 seq
= file
->private_data
;
7157 seq
->poll_event
= atomic_read(&md_event_count
);
7161 static unsigned int mdstat_poll(struct file
*filp
, poll_table
*wait
)
7163 struct seq_file
*seq
= filp
->private_data
;
7166 poll_wait(filp
, &md_event_waiters
, wait
);
7168 /* always allow read */
7169 mask
= POLLIN
| POLLRDNORM
;
7171 if (seq
->poll_event
!= atomic_read(&md_event_count
))
7172 mask
|= POLLERR
| POLLPRI
;
7176 static const struct file_operations md_seq_fops
= {
7177 .owner
= THIS_MODULE
,
7178 .open
= md_seq_open
,
7180 .llseek
= seq_lseek
,
7181 .release
= seq_release_private
,
7182 .poll
= mdstat_poll
,
7185 int register_md_personality(struct md_personality
*p
)
7187 spin_lock(&pers_lock
);
7188 list_add_tail(&p
->list
, &pers_list
);
7189 printk(KERN_INFO
"md: %s personality registered for level %d\n", p
->name
, p
->level
);
7190 spin_unlock(&pers_lock
);
7194 int unregister_md_personality(struct md_personality
*p
)
7196 printk(KERN_INFO
"md: %s personality unregistered\n", p
->name
);
7197 spin_lock(&pers_lock
);
7198 list_del_init(&p
->list
);
7199 spin_unlock(&pers_lock
);
7203 static int is_mddev_idle(struct mddev
*mddev
, int init
)
7205 struct md_rdev
* rdev
;
7211 rdev_for_each_rcu(rdev
, mddev
) {
7212 struct gendisk
*disk
= rdev
->bdev
->bd_contains
->bd_disk
;
7213 curr_events
= (int)part_stat_read(&disk
->part0
, sectors
[0]) +
7214 (int)part_stat_read(&disk
->part0
, sectors
[1]) -
7215 atomic_read(&disk
->sync_io
);
7216 /* sync IO will cause sync_io to increase before the disk_stats
7217 * as sync_io is counted when a request starts, and
7218 * disk_stats is counted when it completes.
7219 * So resync activity will cause curr_events to be smaller than
7220 * when there was no such activity.
7221 * non-sync IO will cause disk_stat to increase without
7222 * increasing sync_io so curr_events will (eventually)
7223 * be larger than it was before. Once it becomes
7224 * substantially larger, the test below will cause
7225 * the array to appear non-idle, and resync will slow
7227 * If there is a lot of outstanding resync activity when
7228 * we set last_event to curr_events, then all that activity
7229 * completing might cause the array to appear non-idle
7230 * and resync will be slowed down even though there might
7231 * not have been non-resync activity. This will only
7232 * happen once though. 'last_events' will soon reflect
7233 * the state where there is little or no outstanding
7234 * resync requests, and further resync activity will
7235 * always make curr_events less than last_events.
7238 if (init
|| curr_events
- rdev
->last_events
> 64) {
7239 rdev
->last_events
= curr_events
;
7247 void md_done_sync(struct mddev
*mddev
, int blocks
, int ok
)
7249 /* another "blocks" (512byte) blocks have been synced */
7250 atomic_sub(blocks
, &mddev
->recovery_active
);
7251 wake_up(&mddev
->recovery_wait
);
7253 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7254 set_bit(MD_RECOVERY_ERROR
, &mddev
->recovery
);
7255 md_wakeup_thread(mddev
->thread
);
7256 // stop recovery, signal do_sync ....
7261 /* md_write_start(mddev, bi)
7262 * If we need to update some array metadata (e.g. 'active' flag
7263 * in superblock) before writing, schedule a superblock update
7264 * and wait for it to complete.
7266 void md_write_start(struct mddev
*mddev
, struct bio
*bi
)
7269 if (bio_data_dir(bi
) != WRITE
)
7272 BUG_ON(mddev
->ro
== 1);
7273 if (mddev
->ro
== 2) {
7274 /* need to switch to read/write */
7276 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7277 md_wakeup_thread(mddev
->thread
);
7278 md_wakeup_thread(mddev
->sync_thread
);
7281 atomic_inc(&mddev
->writes_pending
);
7282 if (mddev
->safemode
== 1)
7283 mddev
->safemode
= 0;
7284 if (mddev
->in_sync
) {
7285 spin_lock_irq(&mddev
->write_lock
);
7286 if (mddev
->in_sync
) {
7288 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7289 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
7290 md_wakeup_thread(mddev
->thread
);
7293 spin_unlock_irq(&mddev
->write_lock
);
7296 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7297 wait_event(mddev
->sb_wait
,
7298 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
7301 void md_write_end(struct mddev
*mddev
)
7303 if (atomic_dec_and_test(&mddev
->writes_pending
)) {
7304 if (mddev
->safemode
== 2)
7305 md_wakeup_thread(mddev
->thread
);
7306 else if (mddev
->safemode_delay
)
7307 mod_timer(&mddev
->safemode_timer
, jiffies
+ mddev
->safemode_delay
);
7311 /* md_allow_write(mddev)
7312 * Calling this ensures that the array is marked 'active' so that writes
7313 * may proceed without blocking. It is important to call this before
7314 * attempting a GFP_KERNEL allocation while holding the mddev lock.
7315 * Must be called with mddev_lock held.
7317 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
7318 * is dropped, so return -EAGAIN after notifying userspace.
7320 int md_allow_write(struct mddev
*mddev
)
7326 if (!mddev
->pers
->sync_request
)
7329 spin_lock_irq(&mddev
->write_lock
);
7330 if (mddev
->in_sync
) {
7332 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7333 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
7334 if (mddev
->safemode_delay
&&
7335 mddev
->safemode
== 0)
7336 mddev
->safemode
= 1;
7337 spin_unlock_irq(&mddev
->write_lock
);
7338 md_update_sb(mddev
, 0);
7339 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7341 spin_unlock_irq(&mddev
->write_lock
);
7343 if (test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
7348 EXPORT_SYMBOL_GPL(md_allow_write
);
7350 #define SYNC_MARKS 10
7351 #define SYNC_MARK_STEP (3*HZ)
7352 #define UPDATE_FREQUENCY (5*60*HZ)
7353 void md_do_sync(struct md_thread
*thread
)
7355 struct mddev
*mddev
= thread
->mddev
;
7356 struct mddev
*mddev2
;
7357 unsigned int currspeed
= 0,
7359 sector_t max_sectors
,j
, io_sectors
;
7360 unsigned long mark
[SYNC_MARKS
];
7361 unsigned long update_time
;
7362 sector_t mark_cnt
[SYNC_MARKS
];
7364 struct list_head
*tmp
;
7365 sector_t last_check
;
7367 struct md_rdev
*rdev
;
7368 char *desc
, *action
= NULL
;
7369 struct blk_plug plug
;
7371 /* just incase thread restarts... */
7372 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
7374 if (mddev
->ro
) /* never try to sync a read-only array */
7377 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7378 if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)) {
7379 desc
= "data-check";
7381 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
7382 desc
= "requested-resync";
7386 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
7391 mddev
->last_sync_action
= action
?: desc
;
7393 /* we overload curr_resync somewhat here.
7394 * 0 == not engaged in resync at all
7395 * 2 == checking that there is no conflict with another sync
7396 * 1 == like 2, but have yielded to allow conflicting resync to
7398 * other == active in resync - this many blocks
7400 * Before starting a resync we must have set curr_resync to
7401 * 2, and then checked that every "conflicting" array has curr_resync
7402 * less than ours. When we find one that is the same or higher
7403 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
7404 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
7405 * This will mean we have to start checking from the beginning again.
7410 mddev
->curr_resync
= 2;
7413 if (kthread_should_stop())
7414 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7416 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7418 for_each_mddev(mddev2
, tmp
) {
7419 if (mddev2
== mddev
)
7421 if (!mddev
->parallel_resync
7422 && mddev2
->curr_resync
7423 && match_mddev_units(mddev
, mddev2
)) {
7425 if (mddev
< mddev2
&& mddev
->curr_resync
== 2) {
7426 /* arbitrarily yield */
7427 mddev
->curr_resync
= 1;
7428 wake_up(&resync_wait
);
7430 if (mddev
> mddev2
&& mddev
->curr_resync
== 1)
7431 /* no need to wait here, we can wait the next
7432 * time 'round when curr_resync == 2
7435 /* We need to wait 'interruptible' so as not to
7436 * contribute to the load average, and not to
7437 * be caught by 'softlockup'
7439 prepare_to_wait(&resync_wait
, &wq
, TASK_INTERRUPTIBLE
);
7440 if (!kthread_should_stop() &&
7441 mddev2
->curr_resync
>= mddev
->curr_resync
) {
7442 printk(KERN_INFO
"md: delaying %s of %s"
7443 " until %s has finished (they"
7444 " share one or more physical units)\n",
7445 desc
, mdname(mddev
), mdname(mddev2
));
7447 if (signal_pending(current
))
7448 flush_signals(current
);
7450 finish_wait(&resync_wait
, &wq
);
7453 finish_wait(&resync_wait
, &wq
);
7456 } while (mddev
->curr_resync
< 2);
7459 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7460 /* resync follows the size requested by the personality,
7461 * which defaults to physical size, but can be virtual size
7463 max_sectors
= mddev
->resync_max_sectors
;
7464 atomic64_set(&mddev
->resync_mismatches
, 0);
7465 /* we don't use the checkpoint if there's a bitmap */
7466 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7467 j
= mddev
->resync_min
;
7468 else if (!mddev
->bitmap
)
7469 j
= mddev
->recovery_cp
;
7471 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
7472 max_sectors
= mddev
->resync_max_sectors
;
7474 /* recovery follows the physical size of devices */
7475 max_sectors
= mddev
->dev_sectors
;
7478 rdev_for_each_rcu(rdev
, mddev
)
7479 if (rdev
->raid_disk
>= 0 &&
7480 !test_bit(Faulty
, &rdev
->flags
) &&
7481 !test_bit(In_sync
, &rdev
->flags
) &&
7482 rdev
->recovery_offset
< j
)
7483 j
= rdev
->recovery_offset
;
7487 printk(KERN_INFO
"md: %s of RAID array %s\n", desc
, mdname(mddev
));
7488 printk(KERN_INFO
"md: minimum _guaranteed_ speed:"
7489 " %d KB/sec/disk.\n", speed_min(mddev
));
7490 printk(KERN_INFO
"md: using maximum available idle IO bandwidth "
7491 "(but not more than %d KB/sec) for %s.\n",
7492 speed_max(mddev
), desc
);
7494 is_mddev_idle(mddev
, 1); /* this initializes IO event counters */
7497 for (m
= 0; m
< SYNC_MARKS
; m
++) {
7499 mark_cnt
[m
] = io_sectors
;
7502 mddev
->resync_mark
= mark
[last_mark
];
7503 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
7506 * Tune reconstruction:
7508 window
= 32*(PAGE_SIZE
/512);
7509 printk(KERN_INFO
"md: using %dk window, over a total of %lluk.\n",
7510 window
/2, (unsigned long long)max_sectors
/2);
7512 atomic_set(&mddev
->recovery_active
, 0);
7517 "md: resuming %s of %s from checkpoint.\n",
7518 desc
, mdname(mddev
));
7519 mddev
->curr_resync
= j
;
7521 mddev
->curr_resync
= 3; /* no longer delayed */
7522 mddev
->curr_resync_completed
= j
;
7523 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
7524 md_new_event(mddev
);
7525 update_time
= jiffies
;
7527 blk_start_plug(&plug
);
7528 while (j
< max_sectors
) {
7533 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
7534 ((mddev
->curr_resync
> mddev
->curr_resync_completed
&&
7535 (mddev
->curr_resync
- mddev
->curr_resync_completed
)
7536 > (max_sectors
>> 4)) ||
7537 time_after_eq(jiffies
, update_time
+ UPDATE_FREQUENCY
) ||
7538 (j
- mddev
->curr_resync_completed
)*2
7539 >= mddev
->resync_max
- mddev
->curr_resync_completed
7541 /* time to update curr_resync_completed */
7542 wait_event(mddev
->recovery_wait
,
7543 atomic_read(&mddev
->recovery_active
) == 0);
7544 mddev
->curr_resync_completed
= j
;
7545 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) &&
7546 j
> mddev
->recovery_cp
)
7547 mddev
->recovery_cp
= j
;
7548 update_time
= jiffies
;
7549 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7550 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
7553 while (j
>= mddev
->resync_max
&& !kthread_should_stop()) {
7554 /* As this condition is controlled by user-space,
7555 * we can block indefinitely, so use '_interruptible'
7556 * to avoid triggering warnings.
7558 flush_signals(current
); /* just in case */
7559 wait_event_interruptible(mddev
->recovery_wait
,
7560 mddev
->resync_max
> j
7561 || kthread_should_stop());
7564 if (kthread_should_stop())
7567 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
,
7568 currspeed
< speed_min(mddev
));
7570 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7574 if (!skipped
) { /* actual IO requested */
7575 io_sectors
+= sectors
;
7576 atomic_add(sectors
, &mddev
->recovery_active
);
7579 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7584 mddev
->curr_resync
= j
;
7585 mddev
->curr_mark_cnt
= io_sectors
;
7586 if (last_check
== 0)
7587 /* this is the earliest that rebuild will be
7588 * visible in /proc/mdstat
7590 md_new_event(mddev
);
7592 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
7595 last_check
= io_sectors
;
7597 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
7599 int next
= (last_mark
+1) % SYNC_MARKS
;
7601 mddev
->resync_mark
= mark
[next
];
7602 mddev
->resync_mark_cnt
= mark_cnt
[next
];
7603 mark
[next
] = jiffies
;
7604 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
7609 if (kthread_should_stop())
7614 * this loop exits only if either when we are slower than
7615 * the 'hard' speed limit, or the system was IO-idle for
7617 * the system might be non-idle CPU-wise, but we only care
7618 * about not overloading the IO subsystem. (things like an
7619 * e2fsck being done on the RAID array should execute fast)
7623 currspeed
= ((unsigned long)(io_sectors
-mddev
->resync_mark_cnt
))/2
7624 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
7626 if (currspeed
> speed_min(mddev
)) {
7627 if ((currspeed
> speed_max(mddev
)) ||
7628 !is_mddev_idle(mddev
, 0)) {
7634 printk(KERN_INFO
"md: %s: %s done.\n",mdname(mddev
), desc
);
7636 * this also signals 'finished resyncing' to md_stop
7639 blk_finish_plug(&plug
);
7640 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
7642 /* tell personality that we are finished */
7643 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
, 1);
7645 if (!test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
) &&
7646 mddev
->curr_resync
> 2) {
7647 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7648 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
7649 if (mddev
->curr_resync
>= mddev
->recovery_cp
) {
7651 "md: checkpointing %s of %s.\n",
7652 desc
, mdname(mddev
));
7653 if (test_bit(MD_RECOVERY_ERROR
,
7655 mddev
->recovery_cp
=
7656 mddev
->curr_resync_completed
;
7658 mddev
->recovery_cp
=
7662 mddev
->recovery_cp
= MaxSector
;
7664 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7665 mddev
->curr_resync
= MaxSector
;
7667 rdev_for_each_rcu(rdev
, mddev
)
7668 if (rdev
->raid_disk
>= 0 &&
7669 mddev
->delta_disks
>= 0 &&
7670 !test_bit(Faulty
, &rdev
->flags
) &&
7671 !test_bit(In_sync
, &rdev
->flags
) &&
7672 rdev
->recovery_offset
< mddev
->curr_resync
)
7673 rdev
->recovery_offset
= mddev
->curr_resync
;
7678 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7680 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
7681 /* We completed so min/max setting can be forgotten if used. */
7682 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7683 mddev
->resync_min
= 0;
7684 mddev
->resync_max
= MaxSector
;
7685 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7686 mddev
->resync_min
= mddev
->curr_resync_completed
;
7687 mddev
->curr_resync
= 0;
7688 wake_up(&resync_wait
);
7689 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
7690 md_wakeup_thread(mddev
->thread
);
7695 * got a signal, exit.
7698 "md: md_do_sync() got signal ... exiting\n");
7699 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7703 EXPORT_SYMBOL_GPL(md_do_sync
);
7705 static int remove_and_add_spares(struct mddev
*mddev
,
7706 struct md_rdev
*this)
7708 struct md_rdev
*rdev
;
7712 rdev_for_each(rdev
, mddev
)
7713 if ((this == NULL
|| rdev
== this) &&
7714 rdev
->raid_disk
>= 0 &&
7715 !test_bit(Blocked
, &rdev
->flags
) &&
7716 (test_bit(Faulty
, &rdev
->flags
) ||
7717 ! test_bit(In_sync
, &rdev
->flags
)) &&
7718 atomic_read(&rdev
->nr_pending
)==0) {
7719 if (mddev
->pers
->hot_remove_disk(
7720 mddev
, rdev
) == 0) {
7721 sysfs_unlink_rdev(mddev
, rdev
);
7722 rdev
->raid_disk
= -1;
7726 if (removed
&& mddev
->kobj
.sd
)
7727 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
7732 rdev_for_each(rdev
, mddev
) {
7733 if (rdev
->raid_disk
>= 0 &&
7734 !test_bit(In_sync
, &rdev
->flags
) &&
7735 !test_bit(Faulty
, &rdev
->flags
))
7737 if (rdev
->raid_disk
>= 0)
7739 if (test_bit(Faulty
, &rdev
->flags
))
7742 rdev
->saved_raid_disk
< 0)
7745 rdev
->recovery_offset
= 0;
7747 hot_add_disk(mddev
, rdev
) == 0) {
7748 if (sysfs_link_rdev(mddev
, rdev
))
7749 /* failure here is OK */;
7751 md_new_event(mddev
);
7752 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7757 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7762 * This routine is regularly called by all per-raid-array threads to
7763 * deal with generic issues like resync and super-block update.
7764 * Raid personalities that don't have a thread (linear/raid0) do not
7765 * need this as they never do any recovery or update the superblock.
7767 * It does not do any resync itself, but rather "forks" off other threads
7768 * to do that as needed.
7769 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
7770 * "->recovery" and create a thread at ->sync_thread.
7771 * When the thread finishes it sets MD_RECOVERY_DONE
7772 * and wakeups up this thread which will reap the thread and finish up.
7773 * This thread also removes any faulty devices (with nr_pending == 0).
7775 * The overall approach is:
7776 * 1/ if the superblock needs updating, update it.
7777 * 2/ If a recovery thread is running, don't do anything else.
7778 * 3/ If recovery has finished, clean up, possibly marking spares active.
7779 * 4/ If there are any faulty devices, remove them.
7780 * 5/ If array is degraded, try to add spares devices
7781 * 6/ If array has spares or is not in-sync, start a resync thread.
7783 void md_check_recovery(struct mddev
*mddev
)
7785 if (mddev
->suspended
)
7789 bitmap_daemon_work(mddev
);
7791 if (signal_pending(current
)) {
7792 if (mddev
->pers
->sync_request
&& !mddev
->external
) {
7793 printk(KERN_INFO
"md: %s in immediate safe mode\n",
7795 mddev
->safemode
= 2;
7797 flush_signals(current
);
7800 if (mddev
->ro
&& !test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
7803 (mddev
->flags
& ~ (1<<MD_CHANGE_PENDING
)) ||
7804 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
7805 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
7806 (mddev
->external
== 0 && mddev
->safemode
== 1) ||
7807 (mddev
->safemode
== 2 && ! atomic_read(&mddev
->writes_pending
)
7808 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
7812 if (mddev_trylock(mddev
)) {
7816 /* On a read-only array we can:
7817 * - remove failed devices
7818 * - add already-in_sync devices if the array itself
7820 * As we only add devices that are already in-sync,
7821 * we can activate the spares immediately.
7823 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7824 remove_and_add_spares(mddev
, NULL
);
7825 mddev
->pers
->spare_active(mddev
);
7829 if (!mddev
->external
) {
7831 spin_lock_irq(&mddev
->write_lock
);
7832 if (mddev
->safemode
&&
7833 !atomic_read(&mddev
->writes_pending
) &&
7835 mddev
->recovery_cp
== MaxSector
) {
7838 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7840 if (mddev
->safemode
== 1)
7841 mddev
->safemode
= 0;
7842 spin_unlock_irq(&mddev
->write_lock
);
7844 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7847 if (mddev
->flags
& MD_UPDATE_SB_FLAGS
)
7848 md_update_sb(mddev
, 0);
7850 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
7851 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
7852 /* resync/recovery still happening */
7853 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7856 if (mddev
->sync_thread
) {
7857 md_reap_sync_thread(mddev
);
7860 /* Set RUNNING before clearing NEEDED to avoid
7861 * any transients in the value of "sync_action".
7863 mddev
->curr_resync_completed
= 0;
7864 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7865 /* Clear some bits that don't mean anything, but
7868 clear_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7869 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
7871 if (!test_and_clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
7872 test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
7874 /* no recovery is running.
7875 * remove any failed drives, then
7876 * add spares if possible.
7877 * Spares are also removed and re-added, to allow
7878 * the personality to fail the re-add.
7881 if (mddev
->reshape_position
!= MaxSector
) {
7882 if (mddev
->pers
->check_reshape
== NULL
||
7883 mddev
->pers
->check_reshape(mddev
) != 0)
7884 /* Cannot proceed */
7886 set_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
7887 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7888 } else if ((spares
= remove_and_add_spares(mddev
, NULL
))) {
7889 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7890 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
7891 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
7892 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7893 } else if (mddev
->recovery_cp
< MaxSector
) {
7894 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7895 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7896 } else if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
7897 /* nothing to be done ... */
7900 if (mddev
->pers
->sync_request
) {
7902 /* We are adding a device or devices to an array
7903 * which has the bitmap stored on all devices.
7904 * So make sure all bitmap pages get written
7906 bitmap_write_all(mddev
->bitmap
);
7908 mddev
->sync_thread
= md_register_thread(md_do_sync
,
7911 if (!mddev
->sync_thread
) {
7912 printk(KERN_ERR
"%s: could not start resync"
7915 /* leave the spares where they are, it shouldn't hurt */
7916 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7917 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7918 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
7919 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
7920 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
7922 md_wakeup_thread(mddev
->sync_thread
);
7923 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7924 md_new_event(mddev
);
7927 wake_up(&mddev
->sb_wait
);
7929 if (!mddev
->sync_thread
) {
7930 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7931 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
7933 if (mddev
->sysfs_action
)
7934 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7936 mddev_unlock(mddev
);
7940 void md_reap_sync_thread(struct mddev
*mddev
)
7942 struct md_rdev
*rdev
;
7944 /* resync has finished, collect result */
7945 md_unregister_thread(&mddev
->sync_thread
);
7946 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
7947 !test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
7949 /* activate any spares */
7950 if (mddev
->pers
->spare_active(mddev
)) {
7951 sysfs_notify(&mddev
->kobj
, NULL
,
7953 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7956 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
7957 mddev
->pers
->finish_reshape
)
7958 mddev
->pers
->finish_reshape(mddev
);
7960 /* If array is no-longer degraded, then any saved_raid_disk
7961 * information must be scrapped. Also if any device is now
7962 * In_sync we must scrape the saved_raid_disk for that device
7963 * do the superblock for an incrementally recovered device
7966 rdev_for_each(rdev
, mddev
)
7967 if (!mddev
->degraded
||
7968 test_bit(In_sync
, &rdev
->flags
))
7969 rdev
->saved_raid_disk
= -1;
7971 md_update_sb(mddev
, 1);
7972 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7973 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7974 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
7975 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
7976 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
7977 /* flag recovery needed just to double check */
7978 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7979 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7980 md_new_event(mddev
);
7981 if (mddev
->event_work
.func
)
7982 queue_work(md_misc_wq
, &mddev
->event_work
);
7985 void md_wait_for_blocked_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
7987 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
7988 wait_event_timeout(rdev
->blocked_wait
,
7989 !test_bit(Blocked
, &rdev
->flags
) &&
7990 !test_bit(BlockedBadBlocks
, &rdev
->flags
),
7991 msecs_to_jiffies(5000));
7992 rdev_dec_pending(rdev
, mddev
);
7994 EXPORT_SYMBOL(md_wait_for_blocked_rdev
);
7996 void md_finish_reshape(struct mddev
*mddev
)
7998 /* called be personality module when reshape completes. */
7999 struct md_rdev
*rdev
;
8001 rdev_for_each(rdev
, mddev
) {
8002 if (rdev
->data_offset
> rdev
->new_data_offset
)
8003 rdev
->sectors
+= rdev
->data_offset
- rdev
->new_data_offset
;
8005 rdev
->sectors
-= rdev
->new_data_offset
- rdev
->data_offset
;
8006 rdev
->data_offset
= rdev
->new_data_offset
;
8009 EXPORT_SYMBOL(md_finish_reshape
);
8011 /* Bad block management.
8012 * We can record which blocks on each device are 'bad' and so just
8013 * fail those blocks, or that stripe, rather than the whole device.
8014 * Entries in the bad-block table are 64bits wide. This comprises:
8015 * Length of bad-range, in sectors: 0-511 for lengths 1-512
8016 * Start of bad-range, sector offset, 54 bits (allows 8 exbibytes)
8017 * A 'shift' can be set so that larger blocks are tracked and
8018 * consequently larger devices can be covered.
8019 * 'Acknowledged' flag - 1 bit. - the most significant bit.
8021 * Locking of the bad-block table uses a seqlock so md_is_badblock
8022 * might need to retry if it is very unlucky.
8023 * We will sometimes want to check for bad blocks in a bi_end_io function,
8024 * so we use the write_seqlock_irq variant.
8026 * When looking for a bad block we specify a range and want to
8027 * know if any block in the range is bad. So we binary-search
8028 * to the last range that starts at-or-before the given endpoint,
8029 * (or "before the sector after the target range")
8030 * then see if it ends after the given start.
8032 * 0 if there are no known bad blocks in the range
8033 * 1 if there are known bad block which are all acknowledged
8034 * -1 if there are bad blocks which have not yet been acknowledged in metadata.
8035 * plus the start/length of the first bad section we overlap.
8037 int md_is_badblock(struct badblocks
*bb
, sector_t s
, int sectors
,
8038 sector_t
*first_bad
, int *bad_sectors
)
8044 sector_t target
= s
+ sectors
;
8047 if (bb
->shift
> 0) {
8048 /* round the start down, and the end up */
8050 target
+= (1<<bb
->shift
) - 1;
8051 target
>>= bb
->shift
;
8052 sectors
= target
- s
;
8054 /* 'target' is now the first block after the bad range */
8057 seq
= read_seqbegin(&bb
->lock
);
8062 /* Binary search between lo and hi for 'target'
8063 * i.e. for the last range that starts before 'target'
8065 /* INVARIANT: ranges before 'lo' and at-or-after 'hi'
8066 * are known not to be the last range before target.
8067 * VARIANT: hi-lo is the number of possible
8068 * ranges, and decreases until it reaches 1
8070 while (hi
- lo
> 1) {
8071 int mid
= (lo
+ hi
) / 2;
8072 sector_t a
= BB_OFFSET(p
[mid
]);
8074 /* This could still be the one, earlier ranges
8078 /* This and later ranges are definitely out. */
8081 /* 'lo' might be the last that started before target, but 'hi' isn't */
8083 /* need to check all range that end after 's' to see if
8084 * any are unacknowledged.
8087 BB_OFFSET(p
[lo
]) + BB_LEN(p
[lo
]) > s
) {
8088 if (BB_OFFSET(p
[lo
]) < target
) {
8089 /* starts before the end, and finishes after
8090 * the start, so they must overlap
8092 if (rv
!= -1 && BB_ACK(p
[lo
]))
8096 *first_bad
= BB_OFFSET(p
[lo
]);
8097 *bad_sectors
= BB_LEN(p
[lo
]);
8103 if (read_seqretry(&bb
->lock
, seq
))
8108 EXPORT_SYMBOL_GPL(md_is_badblock
);
8111 * Add a range of bad blocks to the table.
8112 * This might extend the table, or might contract it
8113 * if two adjacent ranges can be merged.
8114 * We binary-search to find the 'insertion' point, then
8115 * decide how best to handle it.
8117 static int md_set_badblocks(struct badblocks
*bb
, sector_t s
, int sectors
,
8123 unsigned long flags
;
8126 /* badblocks are disabled */
8130 /* round the start down, and the end up */
8131 sector_t next
= s
+ sectors
;
8133 next
+= (1<<bb
->shift
) - 1;
8138 write_seqlock_irqsave(&bb
->lock
, flags
);
8143 /* Find the last range that starts at-or-before 's' */
8144 while (hi
- lo
> 1) {
8145 int mid
= (lo
+ hi
) / 2;
8146 sector_t a
= BB_OFFSET(p
[mid
]);
8152 if (hi
> lo
&& BB_OFFSET(p
[lo
]) > s
)
8156 /* we found a range that might merge with the start
8159 sector_t a
= BB_OFFSET(p
[lo
]);
8160 sector_t e
= a
+ BB_LEN(p
[lo
]);
8161 int ack
= BB_ACK(p
[lo
]);
8163 /* Yes, we can merge with a previous range */
8164 if (s
== a
&& s
+ sectors
>= e
)
8165 /* new range covers old */
8168 ack
= ack
&& acknowledged
;
8170 if (e
< s
+ sectors
)
8172 if (e
- a
<= BB_MAX_LEN
) {
8173 p
[lo
] = BB_MAKE(a
, e
-a
, ack
);
8176 /* does not all fit in one range,
8177 * make p[lo] maximal
8179 if (BB_LEN(p
[lo
]) != BB_MAX_LEN
)
8180 p
[lo
] = BB_MAKE(a
, BB_MAX_LEN
, ack
);
8186 if (sectors
&& hi
< bb
->count
) {
8187 /* 'hi' points to the first range that starts after 's'.
8188 * Maybe we can merge with the start of that range */
8189 sector_t a
= BB_OFFSET(p
[hi
]);
8190 sector_t e
= a
+ BB_LEN(p
[hi
]);
8191 int ack
= BB_ACK(p
[hi
]);
8192 if (a
<= s
+ sectors
) {
8193 /* merging is possible */
8194 if (e
<= s
+ sectors
) {
8199 ack
= ack
&& acknowledged
;
8202 if (e
- a
<= BB_MAX_LEN
) {
8203 p
[hi
] = BB_MAKE(a
, e
-a
, ack
);
8206 p
[hi
] = BB_MAKE(a
, BB_MAX_LEN
, ack
);
8214 if (sectors
== 0 && hi
< bb
->count
) {
8215 /* we might be able to combine lo and hi */
8216 /* Note: 's' is at the end of 'lo' */
8217 sector_t a
= BB_OFFSET(p
[hi
]);
8218 int lolen
= BB_LEN(p
[lo
]);
8219 int hilen
= BB_LEN(p
[hi
]);
8220 int newlen
= lolen
+ hilen
- (s
- a
);
8221 if (s
>= a
&& newlen
< BB_MAX_LEN
) {
8222 /* yes, we can combine them */
8223 int ack
= BB_ACK(p
[lo
]) && BB_ACK(p
[hi
]);
8224 p
[lo
] = BB_MAKE(BB_OFFSET(p
[lo
]), newlen
, ack
);
8225 memmove(p
+ hi
, p
+ hi
+ 1,
8226 (bb
->count
- hi
- 1) * 8);
8231 /* didn't merge (it all).
8232 * Need to add a range just before 'hi' */
8233 if (bb
->count
>= MD_MAX_BADBLOCKS
) {
8234 /* No room for more */
8238 int this_sectors
= sectors
;
8239 memmove(p
+ hi
+ 1, p
+ hi
,
8240 (bb
->count
- hi
) * 8);
8243 if (this_sectors
> BB_MAX_LEN
)
8244 this_sectors
= BB_MAX_LEN
;
8245 p
[hi
] = BB_MAKE(s
, this_sectors
, acknowledged
);
8246 sectors
-= this_sectors
;
8253 bb
->unacked_exist
= 1;
8254 write_sequnlock_irqrestore(&bb
->lock
, flags
);
8259 int rdev_set_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
8264 s
+= rdev
->new_data_offset
;
8266 s
+= rdev
->data_offset
;
8267 rv
= md_set_badblocks(&rdev
->badblocks
,
8270 /* Make sure they get written out promptly */
8271 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
8272 set_bit(MD_CHANGE_CLEAN
, &rdev
->mddev
->flags
);
8273 md_wakeup_thread(rdev
->mddev
->thread
);
8277 EXPORT_SYMBOL_GPL(rdev_set_badblocks
);
8280 * Remove a range of bad blocks from the table.
8281 * This may involve extending the table if we spilt a region,
8282 * but it must not fail. So if the table becomes full, we just
8283 * drop the remove request.
8285 static int md_clear_badblocks(struct badblocks
*bb
, sector_t s
, int sectors
)
8289 sector_t target
= s
+ sectors
;
8292 if (bb
->shift
> 0) {
8293 /* When clearing we round the start up and the end down.
8294 * This should not matter as the shift should align with
8295 * the block size and no rounding should ever be needed.
8296 * However it is better the think a block is bad when it
8297 * isn't than to think a block is not bad when it is.
8299 s
+= (1<<bb
->shift
) - 1;
8301 target
>>= bb
->shift
;
8302 sectors
= target
- s
;
8305 write_seqlock_irq(&bb
->lock
);
8310 /* Find the last range that starts before 'target' */
8311 while (hi
- lo
> 1) {
8312 int mid
= (lo
+ hi
) / 2;
8313 sector_t a
= BB_OFFSET(p
[mid
]);
8320 /* p[lo] is the last range that could overlap the
8321 * current range. Earlier ranges could also overlap,
8322 * but only this one can overlap the end of the range.
8324 if (BB_OFFSET(p
[lo
]) + BB_LEN(p
[lo
]) > target
) {
8325 /* Partial overlap, leave the tail of this range */
8326 int ack
= BB_ACK(p
[lo
]);
8327 sector_t a
= BB_OFFSET(p
[lo
]);
8328 sector_t end
= a
+ BB_LEN(p
[lo
]);
8331 /* we need to split this range */
8332 if (bb
->count
>= MD_MAX_BADBLOCKS
) {
8336 memmove(p
+lo
+1, p
+lo
, (bb
->count
- lo
) * 8);
8338 p
[lo
] = BB_MAKE(a
, s
-a
, ack
);
8341 p
[lo
] = BB_MAKE(target
, end
- target
, ack
);
8342 /* there is no longer an overlap */
8347 BB_OFFSET(p
[lo
]) + BB_LEN(p
[lo
]) > s
) {
8348 /* This range does overlap */
8349 if (BB_OFFSET(p
[lo
]) < s
) {
8350 /* Keep the early parts of this range. */
8351 int ack
= BB_ACK(p
[lo
]);
8352 sector_t start
= BB_OFFSET(p
[lo
]);
8353 p
[lo
] = BB_MAKE(start
, s
- start
, ack
);
8354 /* now low doesn't overlap, so.. */
8359 /* 'lo' is strictly before, 'hi' is strictly after,
8360 * anything between needs to be discarded
8363 memmove(p
+lo
+1, p
+hi
, (bb
->count
- hi
) * 8);
8364 bb
->count
-= (hi
- lo
- 1);
8370 write_sequnlock_irq(&bb
->lock
);
8374 int rdev_clear_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
8378 s
+= rdev
->new_data_offset
;
8380 s
+= rdev
->data_offset
;
8381 return md_clear_badblocks(&rdev
->badblocks
,
8384 EXPORT_SYMBOL_GPL(rdev_clear_badblocks
);
8387 * Acknowledge all bad blocks in a list.
8388 * This only succeeds if ->changed is clear. It is used by
8389 * in-kernel metadata updates
8391 void md_ack_all_badblocks(struct badblocks
*bb
)
8393 if (bb
->page
== NULL
|| bb
->changed
)
8394 /* no point even trying */
8396 write_seqlock_irq(&bb
->lock
);
8398 if (bb
->changed
== 0 && bb
->unacked_exist
) {
8401 for (i
= 0; i
< bb
->count
; i
++) {
8402 if (!BB_ACK(p
[i
])) {
8403 sector_t start
= BB_OFFSET(p
[i
]);
8404 int len
= BB_LEN(p
[i
]);
8405 p
[i
] = BB_MAKE(start
, len
, 1);
8408 bb
->unacked_exist
= 0;
8410 write_sequnlock_irq(&bb
->lock
);
8412 EXPORT_SYMBOL_GPL(md_ack_all_badblocks
);
8414 /* sysfs access to bad-blocks list.
8415 * We present two files.
8416 * 'bad-blocks' lists sector numbers and lengths of ranges that
8417 * are recorded as bad. The list is truncated to fit within
8418 * the one-page limit of sysfs.
8419 * Writing "sector length" to this file adds an acknowledged
8421 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
8422 * been acknowledged. Writing to this file adds bad blocks
8423 * without acknowledging them. This is largely for testing.
8427 badblocks_show(struct badblocks
*bb
, char *page
, int unack
)
8438 seq
= read_seqbegin(&bb
->lock
);
8443 while (len
< PAGE_SIZE
&& i
< bb
->count
) {
8444 sector_t s
= BB_OFFSET(p
[i
]);
8445 unsigned int length
= BB_LEN(p
[i
]);
8446 int ack
= BB_ACK(p
[i
]);
8452 len
+= snprintf(page
+len
, PAGE_SIZE
-len
, "%llu %u\n",
8453 (unsigned long long)s
<< bb
->shift
,
8454 length
<< bb
->shift
);
8456 if (unack
&& len
== 0)
8457 bb
->unacked_exist
= 0;
8459 if (read_seqretry(&bb
->lock
, seq
))
8468 badblocks_store(struct badblocks
*bb
, const char *page
, size_t len
, int unack
)
8470 unsigned long long sector
;
8474 /* Allow clearing via sysfs *only* for testing/debugging.
8475 * Normally only a successful write may clear a badblock
8478 if (page
[0] == '-') {
8482 #endif /* DO_DEBUG */
8484 switch (sscanf(page
, "%llu %d%c", §or
, &length
, &newline
)) {
8486 if (newline
!= '\n')
8498 md_clear_badblocks(bb
, sector
, length
);
8501 #endif /* DO_DEBUG */
8502 if (md_set_badblocks(bb
, sector
, length
, !unack
))
8508 static int md_notify_reboot(struct notifier_block
*this,
8509 unsigned long code
, void *x
)
8511 struct list_head
*tmp
;
8512 struct mddev
*mddev
;
8515 for_each_mddev(mddev
, tmp
) {
8516 if (mddev_trylock(mddev
)) {
8518 __md_stop_writes(mddev
);
8519 mddev
->safemode
= 2;
8520 mddev_unlock(mddev
);
8525 * certain more exotic SCSI devices are known to be
8526 * volatile wrt too early system reboots. While the
8527 * right place to handle this issue is the given
8528 * driver, we do want to have a safe RAID driver ...
8536 static struct notifier_block md_notifier
= {
8537 .notifier_call
= md_notify_reboot
,
8539 .priority
= INT_MAX
, /* before any real devices */
8542 static void md_geninit(void)
8544 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
8546 proc_create("mdstat", S_IRUGO
, NULL
, &md_seq_fops
);
8549 static int __init
md_init(void)
8553 md_wq
= alloc_workqueue("md", WQ_MEM_RECLAIM
, 0);
8557 md_misc_wq
= alloc_workqueue("md_misc", 0, 0);
8561 if ((ret
= register_blkdev(MD_MAJOR
, "md")) < 0)
8564 if ((ret
= register_blkdev(0, "mdp")) < 0)
8568 blk_register_region(MKDEV(MD_MAJOR
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
8569 md_probe
, NULL
, NULL
);
8570 blk_register_region(MKDEV(mdp_major
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
8571 md_probe
, NULL
, NULL
);
8573 register_reboot_notifier(&md_notifier
);
8574 raid_table_header
= register_sysctl_table(raid_root_table
);
8580 unregister_blkdev(MD_MAJOR
, "md");
8582 destroy_workqueue(md_misc_wq
);
8584 destroy_workqueue(md_wq
);
8592 * Searches all registered partitions for autorun RAID arrays
8596 static LIST_HEAD(all_detected_devices
);
8597 struct detected_devices_node
{
8598 struct list_head list
;
8602 void md_autodetect_dev(dev_t dev
)
8604 struct detected_devices_node
*node_detected_dev
;
8606 node_detected_dev
= kzalloc(sizeof(*node_detected_dev
), GFP_KERNEL
);
8607 if (node_detected_dev
) {
8608 node_detected_dev
->dev
= dev
;
8609 list_add_tail(&node_detected_dev
->list
, &all_detected_devices
);
8611 printk(KERN_CRIT
"md: md_autodetect_dev: kzalloc failed"
8612 ", skipping dev(%d,%d)\n", MAJOR(dev
), MINOR(dev
));
8617 static void autostart_arrays(int part
)
8619 struct md_rdev
*rdev
;
8620 struct detected_devices_node
*node_detected_dev
;
8622 int i_scanned
, i_passed
;
8627 printk(KERN_INFO
"md: Autodetecting RAID arrays.\n");
8629 while (!list_empty(&all_detected_devices
) && i_scanned
< INT_MAX
) {
8631 node_detected_dev
= list_entry(all_detected_devices
.next
,
8632 struct detected_devices_node
, list
);
8633 list_del(&node_detected_dev
->list
);
8634 dev
= node_detected_dev
->dev
;
8635 kfree(node_detected_dev
);
8636 rdev
= md_import_device(dev
,0, 90);
8640 if (test_bit(Faulty
, &rdev
->flags
)) {
8644 set_bit(AutoDetected
, &rdev
->flags
);
8645 list_add(&rdev
->same_set
, &pending_raid_disks
);
8649 printk(KERN_INFO
"md: Scanned %d and added %d devices.\n",
8650 i_scanned
, i_passed
);
8652 autorun_devices(part
);
8655 #endif /* !MODULE */
8657 static __exit
void md_exit(void)
8659 struct mddev
*mddev
;
8660 struct list_head
*tmp
;
8662 blk_unregister_region(MKDEV(MD_MAJOR
,0), 1U << MINORBITS
);
8663 blk_unregister_region(MKDEV(mdp_major
,0), 1U << MINORBITS
);
8665 unregister_blkdev(MD_MAJOR
,"md");
8666 unregister_blkdev(mdp_major
, "mdp");
8667 unregister_reboot_notifier(&md_notifier
);
8668 unregister_sysctl_table(raid_table_header
);
8669 remove_proc_entry("mdstat", NULL
);
8670 for_each_mddev(mddev
, tmp
) {
8671 export_array(mddev
);
8672 mddev
->hold_active
= 0;
8674 destroy_workqueue(md_misc_wq
);
8675 destroy_workqueue(md_wq
);
8678 subsys_initcall(md_init
);
8679 module_exit(md_exit
)
8681 static int get_ro(char *buffer
, struct kernel_param
*kp
)
8683 return sprintf(buffer
, "%d", start_readonly
);
8685 static int set_ro(const char *val
, struct kernel_param
*kp
)
8688 int num
= simple_strtoul(val
, &e
, 10);
8689 if (*val
&& (*e
== '\0' || *e
== '\n')) {
8690 start_readonly
= num
;
8696 module_param_call(start_ro
, set_ro
, get_ro
, NULL
, S_IRUSR
|S_IWUSR
);
8697 module_param(start_dirty_degraded
, int, S_IRUGO
|S_IWUSR
);
8699 module_param_call(new_array
, add_named_array
, NULL
, NULL
, S_IWUSR
);
8701 EXPORT_SYMBOL(register_md_personality
);
8702 EXPORT_SYMBOL(unregister_md_personality
);
8703 EXPORT_SYMBOL(md_error
);
8704 EXPORT_SYMBOL(md_done_sync
);
8705 EXPORT_SYMBOL(md_write_start
);
8706 EXPORT_SYMBOL(md_write_end
);
8707 EXPORT_SYMBOL(md_register_thread
);
8708 EXPORT_SYMBOL(md_unregister_thread
);
8709 EXPORT_SYMBOL(md_wakeup_thread
);
8710 EXPORT_SYMBOL(md_check_recovery
);
8711 EXPORT_SYMBOL(md_reap_sync_thread
);
8712 MODULE_LICENSE("GPL");
8713 MODULE_DESCRIPTION("MD RAID framework");
8715 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);